-diff -Nurb linux.stock/include/linux/if_bridge.h linux/include/linux/if_bridge.h
---- linux.stock/include/linux/if_bridge.h 2003-10-14 04:09:25.000000000 -0400
-+++ linux/include/linux/if_bridge.h 2004-07-10 23:46:39.000000000 -0400
-@@ -102,7 +102,8 @@
+--- linux-2.4.21/net/bridge/br_private.h Mon Feb 25 20:38:14 2002
++++ linux-2.4.21-ebt-brnf-3/net/bridge/br_private.h Fri Aug 8 01:09:06 2003
+@@ -144,8 +144,10 @@ extern void br_fdb_insert(struct net_bri
+ /* br_forward.c */
+ extern void br_deliver(struct net_bridge_port *to,
+ struct sk_buff *skb);
++extern int br_dev_queue_push_xmit(struct sk_buff *skb);
+ extern void br_forward(struct net_bridge_port *to,
+ struct sk_buff *skb);
++extern int br_forward_finish(struct sk_buff *skb);
+ extern void br_flood_deliver(struct net_bridge *br,
+ struct sk_buff *skb,
+ int clone);
+@@ -166,7 +168,8 @@ extern void br_get_port_ifindices(struct
+ int *ifindices);
+
+ /* br_input.c */
+-extern void br_handle_frame(struct sk_buff *skb);
++extern int br_handle_frame_finish(struct sk_buff *skb);
++extern int br_handle_frame(struct sk_buff *skb);
+
+ /* br_ioctl.c */
+ extern void br_call_ioctl_atomic(void (*fn)(void));
+@@ -176,6 +179,10 @@ extern int br_ioctl(struct net_bridge *b
+ unsigned long arg1,
+ unsigned long arg2);
+ extern int br_ioctl_deviceless_stub(unsigned long arg);
++
++/* br_netfilter.c */
++extern int br_netfilter_init(void);
++extern void br_netfilter_fini(void);
+
+ /* br_stp.c */
+ extern int br_is_root_bridge(struct net_bridge *br);
+--- linux-2.4.21/include/linux/if_bridge.h Thu Nov 22 20:47:12 2001
++++ linux-2.4.21-ebt-brnf-3/include/linux/if_bridge.h Fri Aug 8 01:09:06 2003
+@@ -102,7 +102,8 @@ struct net_bridge;
struct net_bridge_port;
extern int (*br_ioctl_hook)(unsigned long arg);
#endif
-diff -Nurb linux.stock/include/linux/netfilter.h linux/include/linux/netfilter.h
---- linux.stock/include/linux/netfilter.h 2004-07-10 23:30:09.000000000 -0400
-+++ linux/include/linux/netfilter.h 2004-07-10 23:46:39.000000000 -0400
-@@ -119,17 +119,23 @@
- /* This is gross, but inline doesn't cut it for avoiding the function
- call in fast path: gcc doesn't inline (needs value tracking?). --RR */
- #ifdef CONFIG_NETFILTER_DEBUG
--#define NF_HOOK nf_hook_slow
-+#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
-+nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN)
-+#define NF_HOOK_THRESH nf_hook_slow
- #else
- #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
- (list_empty(&nf_hooks[(pf)][(hook)]) \
- ? (okfn)(skb) \
-- : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn)))
-+ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN))
-+#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
-+(list_empty(&nf_hooks[(pf)][(hook)]) \
-+ ? (okfn)(skb) \
-+ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), (thresh)))
+--- linux-2.4.21/net/core/dev.c Fri Jun 13 16:51:39 2003
++++ linux-2.4.21-ebt-brnf-3/net/core/dev.c Fri Aug 8 01:10:03 2003
+@@ -1424,7 +1424,7 @@ static void net_tx_action(struct softirq
+
+
+ #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
+-void (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
++int (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
#endif
- int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
- struct net_device *indev, struct net_device *outdev,
-- int (*okfn)(struct sk_buff *));
-+ int (*okfn)(struct sk_buff *), int thresh);
+ static __inline__ int handle_bridge(struct sk_buff *skb,
+@@ -1441,7 +1441,6 @@ static __inline__ int handle_bridge(stru
+ }
+ }
- /* Call setsockopt() */
- int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt,
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_802_3.h linux/include/linux/netfilter_bridge/ebt_802_3.h
---- linux.stock/include/linux/netfilter_bridge/ebt_802_3.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_802_3.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,60 @@
-+#ifndef __LINUX_BRIDGE_EBT_802_3_H
-+#define __LINUX_BRIDGE_EBT_802_3_H
-+
-+#define EBT_802_3_SAP 0x01
-+#define EBT_802_3_TYPE 0x02
-+
-+#define EBT_802_3_MATCH "802_3"
-+
-+/*
-+ * If frame has DSAP/SSAP value 0xaa you must check the SNAP type
-+ * to discover what kind of packet we're carrying.
-+ */
-+#define CHECK_TYPE 0xaa
-+
-+/*
-+ * Control field may be one or two bytes. If the first byte has
-+ * the value 0x03 then the entire length is one byte, otherwise it is two.
-+ * One byte controls are used in Unnumbered Information frames.
-+ * Two byte controls are used in Numbered Information frames.
-+ */
-+#define IS_UI 0x03
-+
-+#define EBT_802_3_MASK (EBT_802_3_SAP | EBT_802_3_TYPE | EBT_802_3)
-+
-+/* ui has one byte ctrl, ni has two */
-+struct hdr_ui {
-+ uint8_t dsap;
-+ uint8_t ssap;
-+ uint8_t ctrl;
-+ uint8_t orig[3];
-+ uint16_t type;
-+};
-+
-+struct hdr_ni {
-+ uint8_t dsap;
-+ uint8_t ssap;
-+ uint16_t ctrl;
-+ uint8_t orig[3];
-+ uint16_t type;
-+};
-+
-+struct ebt_802_3_hdr {
-+ uint8_t daddr[6];
-+ uint8_t saddr[6];
-+ uint16_t len;
-+ union {
-+ struct hdr_ui ui;
-+ struct hdr_ni ni;
-+ } llc;
-+};
-+
-+struct ebt_802_3_info
-+{
-+ uint8_t sap;
-+ uint16_t type;
-+ uint8_t bitmask;
-+ uint8_t invflags;
-+};
-+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_among.h linux/include/linux/netfilter_bridge/ebt_among.h
---- linux.stock/include/linux/netfilter_bridge/ebt_among.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_among.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,65 @@
-+#ifndef __LINUX_BRIDGE_EBT_AMONG_H
-+#define __LINUX_BRIDGE_EBT_AMONG_H
-+
-+#define EBT_AMONG_DST 0x01
-+#define EBT_AMONG_SRC 0x02
-+
-+/* Grzegorz Borowiak <grzes@gnu.univ.gda.pl> 2003
-+ *
-+ * Write-once-read-many hash table, used for checking if a given
-+ * MAC address belongs to a set or not and possibly for checking
-+ * if it is related with a given IPv4 address.
-+ *
-+ * The hash value of an address is its last byte.
-+ *
-+ * In real-world ethernet addresses, values of the last byte are
-+ * evenly distributed and there is no need to consider other bytes.
-+ * It would only slow the routines down.
-+ *
-+ * For MAC address comparison speedup reasons, we introduce a trick.
-+ * MAC address is mapped onto an array of two 32-bit integers.
-+ * This pair of integers is compared with MAC addresses in the
-+ * hash table, which are stored also in form of pairs of integers
-+ * (in `cmp' array). This is quick as it requires only two elementary
-+ * number comparisons in worst case. Further, we take advantage of
-+ * fact that entropy of 3 last bytes of address is larger than entropy
-+ * of 3 first bytes. So first we compare 4 last bytes of addresses and
-+ * if they are the same we compare 2 first.
-+ *
-+ * Yes, it is a memory overhead, but in 2003 AD, who cares?
-+ */
-+
-+struct ebt_mac_wormhash_tuple
-+{
-+ uint32_t cmp[2];
-+ uint32_t ip;
-+};
-+
-+struct ebt_mac_wormhash
-+{
-+ int table[257];
-+ int poolsize;
-+ struct ebt_mac_wormhash_tuple pool[0];
-+};
-+
-+#define ebt_mac_wormhash_size(x) ((x) ? sizeof(struct ebt_mac_wormhash) \
-+ + (x)->poolsize * sizeof(struct ebt_mac_wormhash_tuple) : 0)
-+
-+struct ebt_among_info
-+{
-+ int wh_dst_ofs;
-+ int wh_src_ofs;
-+ int bitmask;
-+};
-+
-+#define EBT_AMONG_DST_NEG 0x1
-+#define EBT_AMONG_SRC_NEG 0x2
+- br_handle_frame_hook(skb);
+ return ret;
+ }
+
+@@ -1497,11 +1496,16 @@ int netif_receive_skb(struct sk_buff *sk
+ if (skb->dev->divert && skb->dev->divert->divert)
+ ret = handle_diverter(skb);
+ #endif /* CONFIG_NET_DIVERT */
+-
+
-+#define ebt_among_wh_dst(x) ((x)->wh_dst_ofs ? \
-+ (struct ebt_mac_wormhash*)((char*)(x) + (x)->wh_dst_ofs) : NULL)
-+#define ebt_among_wh_src(x) ((x)->wh_src_ofs ? \
-+ (struct ebt_mac_wormhash*)((char*)(x) + (x)->wh_src_ofs) : NULL)
+ #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
+ if (skb->dev->br_port != NULL &&
+- br_handle_frame_hook != NULL) {
+- return handle_bridge(skb, pt_prev);
++ br_handle_frame_hook != NULL) {
++ int ret;
+
-+#define EBT_AMONG_MATCH "among"
++ ret = handle_bridge(skb, pt_prev);
++ if (br_handle_frame_hook(skb) == 0)
++ return ret;
++ pt_prev = NULL;
+ }
+ #endif
+
+@@ -1897,7 +1901,7 @@ static int dev_proc_stats(char *buffer,
+ * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
+ * function returns zero.
+ */
+-
+
+ int netdev_set_master(struct net_device *slave, struct net_device *master)
+ {
+ struct net_device *old = slave->master;
+--- linux-2.4.21/net/bridge/br_input.c Sat Aug 3 02:39:46 2002
++++ linux-2.4.21-ebt-brnf-3/net/bridge/br_input.c Fri Aug 8 01:09:06 2003
+@@ -24,6 +24,9 @@ unsigned char bridge_ula[6] = { 0x01, 0x
+
+ static int br_pass_frame_up_finish(struct sk_buff *skb)
+ {
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug = 0;
+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_arp.h linux/include/linux/netfilter_bridge/ebt_arp.h
---- linux.stock/include/linux/netfilter_bridge/ebt_arp.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_arp.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,32 @@
-+#ifndef __LINUX_BRIDGE_EBT_ARP_H
-+#define __LINUX_BRIDGE_EBT_ARP_H
-+
-+#define EBT_ARP_OPCODE 0x01
-+#define EBT_ARP_HTYPE 0x02
-+#define EBT_ARP_PTYPE 0x04
-+#define EBT_ARP_SRC_IP 0x08
-+#define EBT_ARP_DST_IP 0x10
-+#define EBT_ARP_SRC_MAC 0x20
-+#define EBT_ARP_DST_MAC 0x40
-+#define EBT_ARP_MASK (EBT_ARP_OPCODE | EBT_ARP_HTYPE | EBT_ARP_PTYPE | \
-+ EBT_ARP_SRC_IP | EBT_ARP_DST_IP | EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC)
-+#define EBT_ARP_MATCH "arp"
-+
-+struct ebt_arp_info
-+{
-+ uint16_t htype;
-+ uint16_t ptype;
-+ uint16_t opcode;
-+ uint32_t saddr;
-+ uint32_t smsk;
-+ uint32_t daddr;
-+ uint32_t dmsk;
-+ unsigned char smaddr[ETH_ALEN];
-+ unsigned char smmsk[ETH_ALEN];
-+ unsigned char dmaddr[ETH_ALEN];
-+ unsigned char dmmsk[ETH_ALEN];
-+ uint8_t bitmask;
-+ uint8_t invflags;
-+};
+ netif_rx(skb);
+
+ return 0;
+@@ -46,7 +49,7 @@ static void br_pass_frame_up(struct net_
+ br_pass_frame_up_finish);
+ }
+
+-static int br_handle_frame_finish(struct sk_buff *skb)
++int br_handle_frame_finish(struct sk_buff *skb)
+ {
+ struct net_bridge *br;
+ unsigned char *dest;
+@@ -112,7 +115,7 @@ err_nolock:
+ return 0;
+ }
+
+-void br_handle_frame(struct sk_buff *skb)
++int br_handle_frame(struct sk_buff *skb)
+ {
+ struct net_bridge *br;
+ unsigned char *dest;
+@@ -146,25 +149,35 @@ void br_handle_frame(struct sk_buff *skb
+ goto handle_special_frame;
+
+ if (p->state == BR_STATE_FORWARDING) {
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_arpreply.h linux/include/linux/netfilter_bridge/ebt_arpreply.h
---- linux.stock/include/linux/netfilter_bridge/ebt_arpreply.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_arpreply.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,11 @@
-+#ifndef __LINUX_BRIDGE_EBT_ARPREPLY_H
-+#define __LINUX_BRIDGE_EBT_ARPREPLY_H
++ if (br_should_route_hook && br_should_route_hook(&skb)) {
++ read_unlock(&br->lock);
++ return -1;
++ }
+
-+struct ebt_arpreply_info
-+{
-+ unsigned char mac[ETH_ALEN];
-+ int target;
-+};
-+#define EBT_ARPREPLY_TARGET "arpreply"
++ if (!memcmp(p->br->dev.dev_addr, dest, ETH_ALEN))
++ skb->pkt_type = PACKET_HOST;
+
+ NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
+ br_handle_frame_finish);
+ read_unlock(&br->lock);
+- return;
++ return 0;
+ }
+
+ err:
+ read_unlock(&br->lock);
+ err_nolock:
+ kfree_skb(skb);
+- return;
++ return 0;
+
+ handle_special_frame:
+ if (!dest[5]) {
+ br_stp_handle_bpdu(skb);
+ read_unlock(&br->lock);
+- return;
++ return 0;
+ }
+
+ read_unlock(&br->lock);
+ kfree_skb(skb);
++ return 0;
+ }
+--- linux-2.4.21/net/bridge/br_forward.c Sat Aug 3 02:39:46 2002
++++ linux-2.4.21-ebt-brnf-3/net/bridge/br_forward.c Fri Aug 8 01:09:06 2003
+@@ -30,18 +30,22 @@ static inline int should_deliver(struct
+ return 1;
+ }
+
+-static int __dev_queue_push_xmit(struct sk_buff *skb)
++int br_dev_queue_push_xmit(struct sk_buff *skb)
+ {
++#ifdef CONFIG_NETFILTER
++ if (skb->nf_bridge)
++ memcpy(skb->data - 16, skb->nf_bridge->hh, 16);
+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_ip.h linux/include/linux/netfilter_bridge/ebt_ip.h
---- linux.stock/include/linux/netfilter_bridge/ebt_ip.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_ip.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,43 @@
-+/*
-+ * ebt_ip
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * April, 2002
-+ *
-+ * Changes:
-+ * added ip-sport and ip-dport
-+ * Innominate Security Technologies AG <mhopf@innominate.com>
-+ * September, 2002
-+ */
-+
-+#ifndef __LINUX_BRIDGE_EBT_IP_H
-+#define __LINUX_BRIDGE_EBT_IP_H
-+
-+#define EBT_IP_SOURCE 0x01
-+#define EBT_IP_DEST 0x02
-+#define EBT_IP_TOS 0x04
-+#define EBT_IP_PROTO 0x08
-+#define EBT_IP_SPORT 0x10
-+#define EBT_IP_DPORT 0x20
-+#define EBT_IP_MASK (EBT_IP_SOURCE | EBT_IP_DEST | EBT_IP_TOS | EBT_IP_PROTO |\
-+ EBT_IP_SPORT | EBT_IP_DPORT )
-+#define EBT_IP_MATCH "ip"
-+
-+// the same values are used for the invflags
-+struct ebt_ip_info
-+{
-+ uint32_t saddr;
-+ uint32_t daddr;
-+ uint32_t smsk;
-+ uint32_t dmsk;
-+ uint8_t tos;
-+ uint8_t protocol;
-+ uint8_t bitmask;
-+ uint8_t invflags;
-+ uint16_t sport[2];
-+ uint16_t dport[2];
-+};
-+
+ skb_push(skb, ETH_HLEN);
+ dev_queue_xmit(skb);
+
+ return 0;
+ }
+
+-static int __br_forward_finish(struct sk_buff *skb)
++int br_forward_finish(struct sk_buff *skb)
+ {
+ NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
+- __dev_queue_push_xmit);
++ br_dev_queue_push_xmit);
+
+ return 0;
+ }
+@@ -49,8 +53,11 @@ static int __br_forward_finish(struct sk
+ static void __br_deliver(struct net_bridge_port *to, struct sk_buff *skb)
+ {
+ skb->dev = to->dev;
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug = 0;
+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_limit.h linux/include/linux/netfilter_bridge/ebt_limit.h
---- linux.stock/include/linux/netfilter_bridge/ebt_limit.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_limit.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,23 @@
-+#ifndef __LINUX_BRIDGE_EBT_LIMIT_H
-+#define __LINUX_BRIDGE_EBT_LIMIT_H
-+
-+#define EBT_LIMIT_MATCH "limit"
-+
-+/* timings are in milliseconds. */
-+#define EBT_LIMIT_SCALE 10000
-+
-+/* 1/10,000 sec period => max of 10,000/sec. Min rate is then 429490
-+ seconds, or one every 59 hours. */
-+
-+struct ebt_limit_info
-+{
-+ u_int32_t avg; /* Average secs between packets * scale */
-+ u_int32_t burst; /* Period multiplier for upper limit. */
-+
-+ /* Used internally by the kernel */
-+ unsigned long prev;
-+ u_int32_t credit;
-+ u_int32_t credit_cap, cost;
-+};
+ NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
+- __br_forward_finish);
++ br_forward_finish);
+ }
+
+ static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb)
+@@ -61,7 +68,7 @@ static void __br_forward(struct net_brid
+ skb->dev = to->dev;
+
+ NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
+- __br_forward_finish);
++ br_forward_finish);
+ }
+
+ /* called under bridge lock */
+--- linux-2.4.21/net/bridge/br.c Fri Nov 29 00:53:15 2002
++++ linux-2.4.21-ebt-brnf-3/net/bridge/br.c Fri Aug 8 01:09:06 2003
+@@ -29,6 +29,8 @@
+ #include "../atm/lec.h"
+ #endif
+
++int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
+
+ void br_dec_use_count()
+ {
+ MOD_DEC_USE_COUNT;
+@@ -43,6 +45,10 @@ static int __init br_init(void)
+ {
+ printk(KERN_INFO "NET4: Ethernet Bridge 008 for NET4.0\n");
+
++#ifdef CONFIG_NETFILTER
++ if (br_netfilter_init())
++ return 1;
+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_log.h linux/include/linux/netfilter_bridge/ebt_log.h
---- linux.stock/include/linux/netfilter_bridge/ebt_log.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_log.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,17 @@
-+#ifndef __LINUX_BRIDGE_EBT_LOG_H
-+#define __LINUX_BRIDGE_EBT_LOG_H
+ br_handle_frame_hook = br_handle_frame;
+ br_ioctl_hook = br_ioctl_deviceless_stub;
+ #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
+@@ -61,6 +67,9 @@ static void __br_clear_ioctl_hook(void)
+
+ static void __exit br_deinit(void)
+ {
++#ifdef CONFIG_NETFILTER
++ br_netfilter_fini();
++#endif
+ unregister_netdevice_notifier(&br_device_notifier);
+ br_call_ioctl_atomic(__br_clear_ioctl_hook);
+
+@@ -74,7 +83,7 @@ static void __exit br_deinit(void)
+ #endif
+ }
+
+-EXPORT_NO_SYMBOLS;
++EXPORT_SYMBOL(br_should_route_hook);
+
+ module_init(br_init)
+ module_exit(br_deinit)
+--- linux-2.4.21/net/bridge/Makefile Fri Dec 29 23:07:24 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/Makefile Fri Aug 8 01:09:06 2003
+@@ -7,10 +7,17 @@
+ #
+ # Note 2! The CFLAGS definition is now in the main makefile...
+
++export-objs := br.o
+
-+#define EBT_LOG_IP 0x01 // if the frame is made by ip, log the ip information
-+#define EBT_LOG_ARP 0x02
-+#define EBT_LOG_MASK (EBT_LOG_IP | EBT_LOG_ARP)
-+#define EBT_LOG_PREFIX_SIZE 30
-+#define EBT_LOG_WATCHER "log"
+ O_TARGET := bridge.o
+ obj-y := br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
+ br_ioctl.o br_notify.o br_stp.o br_stp_bpdu.o \
+ br_stp_if.o br_stp_timer.o
+
-+struct ebt_log_info
-+{
-+ uint8_t loglevel;
-+ uint8_t prefix[EBT_LOG_PREFIX_SIZE];
-+ uint32_t bitmask;
-+};
++ifeq ($(CONFIG_NETFILTER),y)
++obj-y += br_netfilter.o
++endif
+
+ obj-m := $(O_TARGET)
+
+ include $(TOPDIR)/Rules.make
+--- linux-2.4.21/include/linux/netfilter_bridge.h Tue Jun 12 04:15:27 2001
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge.h Fri Aug 8 01:09:06 2003
+@@ -1,11 +1,14 @@
+ #ifndef __LINUX_BRIDGE_NETFILTER_H
+ #define __LINUX_BRIDGE_NETFILTER_H
+
+-/* bridge-specific defines for netfilter.
++/* bridge-specific defines for netfilter.
+ */
+
+ #include <linux/config.h>
+ #include <linux/netfilter.h>
++#if defined(__KERNEL__) && defined(CONFIG_NETFILTER)
++#include <asm/atomic.h>
+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_mark_m.h linux/include/linux/netfilter_bridge/ebt_mark_m.h
---- linux.stock/include/linux/netfilter_bridge/ebt_mark_m.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_mark_m.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,15 @@
-+#ifndef __LINUX_BRIDGE_EBT_MARK_M_H
-+#define __LINUX_BRIDGE_EBT_MARK_M_H
+
+ /* Bridge Hooks */
+ /* After promisc drops, checksum checks. */
+@@ -18,7 +21,49 @@
+ #define NF_BR_LOCAL_OUT 3
+ /* Packets about to hit the wire. */
+ #define NF_BR_POST_ROUTING 4
+-#define NF_BR_NUMHOOKS 5
++/* Not really a hook, but used for the ebtables broute table */
++#define NF_BR_BROUTING 5
++#define NF_BR_NUMHOOKS 6
+
++#ifdef __KERNEL__
+
++#define BRNF_PKT_TYPE 0x01
++#define BRNF_BRIDGED_DNAT 0x02
++#define BRNF_DONT_TAKE_PARENT 0x04
++#define BRNF_BRIDGED 0x08
+
-+#define EBT_MARK_AND 0x01
-+#define EBT_MARK_OR 0x02
-+#define EBT_MARK_MASK (EBT_MARK_AND | EBT_MARK_OR)
-+struct ebt_mark_m_info
-+{
-+ unsigned long mark, mask;
-+ uint8_t invert;
-+ uint8_t bitmask;
++enum nf_br_hook_priorities {
++ NF_BR_PRI_FIRST = INT_MIN,
++ NF_BR_PRI_NAT_DST_BRIDGED = -300,
++ NF_BR_PRI_FILTER_BRIDGED = -200,
++ NF_BR_PRI_BRNF = 0,
++ NF_BR_PRI_NAT_DST_OTHER = 100,
++ NF_BR_PRI_FILTER_OTHER = 200,
++ NF_BR_PRI_NAT_SRC = 300,
++ NF_BR_PRI_LAST = INT_MAX,
+};
-+#define EBT_MARK_MATCH "mark_m"
-+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_mark_t.h linux/include/linux/netfilter_bridge/ebt_mark_t.h
---- linux.stock/include/linux/netfilter_bridge/ebt_mark_t.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_mark_t.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,12 @@
-+#ifndef __LINUX_BRIDGE_EBT_MARK_T_H
-+#define __LINUX_BRIDGE_EBT_MARK_T_H
+
-+struct ebt_mark_t_info
++#ifdef CONFIG_NETFILTER
++static inline
++struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
+{
-+ unsigned long mark;
-+ // EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
-+ int target;
-+};
-+#define EBT_MARK_TARGET "mark"
-+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_nat.h linux/include/linux/netfilter_bridge/ebt_nat.h
---- linux.stock/include/linux/netfilter_bridge/ebt_nat.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_nat.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,13 @@
-+#ifndef __LINUX_BRIDGE_EBT_NAT_H
-+#define __LINUX_BRIDGE_EBT_NAT_H
++ struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
+
-+struct ebt_nat_info
-+{
-+ unsigned char mac[ETH_ALEN];
-+ // EBT_ACCEPT, EBT_DROP, EBT_CONTINUE or EBT_RETURN
-+ int target;
-+};
-+#define EBT_SNAT_TARGET "snat"
-+#define EBT_DNAT_TARGET "dnat"
++ if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
++ atomic_set(&(*nf_bridge)->use, 1);
++ (*nf_bridge)->mask = 0;
++ (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
++ }
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_pkttype.h linux/include/linux/netfilter_bridge/ebt_pkttype.h
---- linux.stock/include/linux/netfilter_bridge/ebt_pkttype.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_pkttype.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,11 @@
-+#ifndef __LINUX_BRIDGE_EBT_PKTTYPE_H
-+#define __LINUX_BRIDGE_EBT_PKTTYPE_H
++ return *nf_bridge;
++}
+
-+struct ebt_pkttype_info
-+{
-+ uint8_t pkt_type;
-+ uint8_t invert;
++struct bridge_skb_cb {
++ union {
++ __u32 ipv4;
++ } daddr;
+};
-+#define EBT_PKTTYPE_MATCH "pkttype"
++#endif /* CONFIG_NETFILTER */
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_redirect.h linux/include/linux/netfilter_bridge/ebt_redirect.h
---- linux.stock/include/linux/netfilter_bridge/ebt_redirect.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_redirect.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,11 @@
-+#ifndef __LINUX_BRIDGE_EBT_REDIRECT_H
-+#define __LINUX_BRIDGE_EBT_REDIRECT_H
++#endif /* __KERNEL__ */
+ #endif
+--- linux-2.4.21/net/Makefile Sat Aug 3 02:39:46 2002
++++ linux-2.4.21-ebt-brnf-3/net/Makefile Fri Aug 8 01:09:06 2003
+@@ -7,7 +7,8 @@
+
+ O_TARGET := network.o
+
+-mod-subdirs := ipv4/netfilter ipv6/netfilter ipx irda bluetooth atm netlink sched core
++mod-subdirs := ipv4/netfilter ipv6/netfilter bridge/netfilter ipx irda \
++ bluetooth atm netlink sched core
+ export-objs := netsyms.o
+
+ subdir-y := core ethernet
+@@ -23,6 +24,12 @@ subdir-$(CONFIG_IPV6) += ipv6
+ ifneq ($(CONFIG_IPV6),n)
+ ifneq ($(CONFIG_IPV6),)
+ subdir-$(CONFIG_NETFILTER) += ipv6/netfilter
++endif
++endif
+
-+struct ebt_redirect_info
-+{
-+ // EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
-+ int target;
-+};
-+#define EBT_REDIRECT_TARGET "redirect"
++ifneq ($(CONFIG_BRIDGE),n)
++ifneq ($(CONFIG_BRIDGE),)
++subdir-$(CONFIG_BRIDGE) += bridge/netfilter
+ endif
+ endif
+
+--- linux-2.4.21/net/Config.in Sat Aug 3 02:39:46 2002
++++ linux-2.4.21-ebt-brnf-3/net/Config.in Fri Aug 8 01:09:06 2003
+@@ -65,6 +65,9 @@ if [ "$CONFIG_DECNET" != "n" ]; then
+ source net/decnet/Config.in
+ fi
+ dep_tristate '802.1d Ethernet Bridging' CONFIG_BRIDGE $CONFIG_INET
++if [ "$CONFIG_BRIDGE" != "n" -a "$CONFIG_NETFILTER" != "n" ]; then
++ source net/bridge/netfilter/Config.in
++fi
+ if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
+ tristate 'CCITT X.25 Packet Layer (EXPERIMENTAL)' CONFIG_X25
+ tristate 'LAPB Data Link Driver (EXPERIMENTAL)' CONFIG_LAPB
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/Makefile Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,30 @@
++#
++# Makefile for the netfilter modules on top of bridging.
++#
++# Note! Dependencies are done automagically by 'make dep', which also
++# removes any old dependencies. DON'T put your own dependencies here
++# unless it's something special (ie not a .c file).
++#
++# Note 2! The CFLAGS definition is now in the main makefile...
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_stp.h linux/include/linux/netfilter_bridge/ebt_stp.h
---- linux.stock/include/linux/netfilter_bridge/ebt_stp.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_stp.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,46 @@
-+#ifndef __LINUX_BRIDGE_EBT_STP_H
-+#define __LINUX_BRIDGE_EBT_STP_H
++O_TARGET := netfilter.o
+
-+#define EBT_STP_TYPE 0x0001
++export-objs := ebtables.o
+
-+#define EBT_STP_FLAGS 0x0002
-+#define EBT_STP_ROOTPRIO 0x0004
-+#define EBT_STP_ROOTADDR 0x0008
-+#define EBT_STP_ROOTCOST 0x0010
-+#define EBT_STP_SENDERPRIO 0x0020
-+#define EBT_STP_SENDERADDR 0x0040
-+#define EBT_STP_PORT 0x0080
-+#define EBT_STP_MSGAGE 0x0100
-+#define EBT_STP_MAXAGE 0x0200
-+#define EBT_STP_HELLOTIME 0x0400
-+#define EBT_STP_FWDD 0x0800
++obj-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o
++obj-$(CONFIG_BRIDGE_EBT_T_FILTER) += ebtable_filter.o
++obj-$(CONFIG_BRIDGE_EBT_T_NAT) += ebtable_nat.o
++obj-$(CONFIG_BRIDGE_EBT_BROUTE) += ebtable_broute.o
++obj-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o
++obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o
++obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o
++obj-$(CONFIG_BRIDGE_EBT_MARKF) += ebt_mark_m.o
++obj-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o
++obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o
++obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_stp.o
++obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
++obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
++obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
++obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
++obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o
++include $(TOPDIR)/Rules.make
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/Config.in Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,19 @@
++#
++# Bridge netfilter configuration
++#
++dep_tristate ' Bridge: ebtables' CONFIG_BRIDGE_NF_EBTABLES $CONFIG_BRIDGE
++dep_tristate ' ebt: filter table support' CONFIG_BRIDGE_EBT_T_FILTER $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: nat table support' CONFIG_BRIDGE_EBT_T_NAT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: broute table support' CONFIG_BRIDGE_EBT_BROUTE $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: log support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: IP filter support' CONFIG_BRIDGE_EBT_IPF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: ARP filter support' CONFIG_BRIDGE_EBT_ARPF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: 802.1Q VLAN filter support' CONFIG_BRIDGE_EBT_VLANF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: 802.3 filter support' CONFIG_BRIDGE_EBT_802_3 $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: packet type filter support' CONFIG_BRIDGE_EBT_PKTTYPE $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: STP filter support' CONFIG_BRIDGE_EBT_STP $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: mark filter support' CONFIG_BRIDGE_EBT_MARKF $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: snat target support' CONFIG_BRIDGE_EBT_SNAT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: dnat target support' CONFIG_BRIDGE_EBT_DNAT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: redirect target support' CONFIG_BRIDGE_EBT_REDIRECT $CONFIG_BRIDGE_NF_EBTABLES
++dep_tristate ' ebt: mark target support' CONFIG_BRIDGE_EBT_MARK_T $CONFIG_BRIDGE_NF_EBTABLES
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtable_filter.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,90 @@
++/*
++ * ebtable_filter
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * April, 2002
++ *
++ */
+
-+#define EBT_STP_MASK 0x0fff
-+#define EBT_STP_CONFIG_MASK 0x0ffe
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/module.h>
+
-+#define EBT_STP_MATCH "stp"
++#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
++ (1 << NF_BR_LOCAL_OUT))
+
-+struct ebt_stp_config_info
++static struct ebt_entries initial_chains[] =
+{
-+ uint8_t flags;
-+ uint16_t root_priol, root_priou;
-+ char root_addr[6], root_addrmsk[6];
-+ uint32_t root_costl, root_costu;
-+ uint16_t sender_priol, sender_priou;
-+ char sender_addr[6], sender_addrmsk[6];
-+ uint16_t portl, portu;
-+ uint16_t msg_agel, msg_ageu;
-+ uint16_t max_agel, max_ageu;
-+ uint16_t hello_timel, hello_timeu;
-+ uint16_t forward_delayl, forward_delayu;
++ {0, "INPUT", 0, EBT_ACCEPT, 0},
++ {0, "FORWARD", 0, EBT_ACCEPT, 0},
++ {0, "OUTPUT", 0, EBT_ACCEPT, 0}
+};
+
-+struct ebt_stp_info
++static struct ebt_replace initial_table =
+{
-+ uint8_t type;
-+ struct ebt_stp_config_info config;
-+ uint16_t bitmask;
-+ uint16_t invflags;
++ "filter", FILTER_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
++ { [NF_BR_LOCAL_IN]&initial_chains[0], [NF_BR_FORWARD]&initial_chains[1],
++ [NF_BR_LOCAL_OUT]&initial_chains[2] }, 0, NULL, (char *)initial_chains
+};
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebt_vlan.h linux/include/linux/netfilter_bridge/ebt_vlan.h
---- linux.stock/include/linux/netfilter_bridge/ebt_vlan.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebt_vlan.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,20 @@
-+#ifndef __LINUX_BRIDGE_EBT_VLAN_H
-+#define __LINUX_BRIDGE_EBT_VLAN_H
++static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
++{
++ if (valid_hooks & ~FILTER_VALID_HOOKS)
++ return -EINVAL;
++ return 0;
++}
+
-+#define EBT_VLAN_ID 0x01
-+#define EBT_VLAN_PRIO 0x02
-+#define EBT_VLAN_ENCAP 0x04
-+#define EBT_VLAN_MASK (EBT_VLAN_ID | EBT_VLAN_PRIO | EBT_VLAN_ENCAP)
-+#define EBT_VLAN_MATCH "vlan"
++static struct ebt_table frame_filter =
++{
++ {NULL, NULL}, "filter", &initial_table, FILTER_VALID_HOOKS,
++ RW_LOCK_UNLOCKED, check, NULL
++};
+
-+struct ebt_vlan_info {
-+ uint16_t id; /* VLAN ID {1-4095} */
-+ uint8_t prio; /* VLAN User Priority {0-7} */
-+ uint16_t encap; /* VLAN Encapsulated frame code {0-65535} */
-+ uint8_t bitmask; /* Args bitmask bit 1=1 - ID arg,
-+ bit 2=1 User-Priority arg, bit 3=1 encap*/
-+ uint8_t invflags; /* Inverse bitmask bit 1=1 - inversed ID arg,
-+ bit 2=1 - inversed Pirority arg */
++static unsigned int
++ebt_hook (unsigned int hook, struct sk_buff **pskb, const struct net_device *in,
++ const struct net_device *out, int (*okfn)(struct sk_buff *))
++{
++ return ebt_do_table(hook, pskb, in, out, &frame_filter);
++}
++
++static struct nf_hook_ops ebt_ops_filter[] = {
++ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_IN,
++ NF_BR_PRI_FILTER_BRIDGED},
++ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_FORWARD,
++ NF_BR_PRI_FILTER_BRIDGED},
++ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_OUT,
++ NF_BR_PRI_FILTER_OTHER}
+};
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge/ebtables.h linux/include/linux/netfilter_bridge/ebtables.h
---- linux.stock/include/linux/netfilter_bridge/ebtables.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_bridge/ebtables.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,361 @@
++static int __init init(void)
++{
++ int i, j, ret;
++
++ ret = ebt_register_table(&frame_filter);
++ if (ret < 0)
++ return ret;
++ for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
++ if ((ret = nf_register_hook(&ebt_ops_filter[i])) < 0)
++ goto cleanup;
++ return ret;
++cleanup:
++ for (j = 0; j < i; j++)
++ nf_unregister_hook(&ebt_ops_filter[j]);
++ ebt_unregister_table(&frame_filter);
++ return ret;
++}
++
++static void __exit fini(void)
++{
++ int i;
++
++ for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
++ nf_unregister_hook(&ebt_ops_filter[i]);
++ ebt_unregister_table(&frame_filter);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtable_nat.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,96 @@
+/*
-+ * ebtables
++ * ebtable_nat
+ *
+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
-+ * ebtables.c,v 2.0, September, 2002
++ * April, 2002
+ *
-+ * This code is stongly inspired on the iptables code which is
-+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ */
+
-+#ifndef __LINUX_BRIDGE_EFF_H
-+#define __LINUX_BRIDGE_EFF_H
-+#include <linux/if.h>
-+#include <linux/netfilter_bridge.h>
-+#include <linux/if_ether.h>
-+
-+#define EBT_TABLE_MAXNAMELEN 32
-+#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
-+#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
-+
-+// verdicts >0 are "branches"
-+#define EBT_ACCEPT -1
-+#define EBT_DROP -2
-+#define EBT_CONTINUE -3
-+#define EBT_RETURN -4
-+#define NUM_STANDARD_TARGETS 4
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/module.h>
++#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
++ (1 << NF_BR_POST_ROUTING))
+
-+struct ebt_counter
++static struct ebt_entries initial_chains[] =
+{
-+ uint64_t pcnt;
-+ uint64_t bcnt;
++ {0, "PREROUTING", 0, EBT_ACCEPT, 0},
++ {0, "OUTPUT", 0, EBT_ACCEPT, 0},
++ {0, "POSTROUTING", 0, EBT_ACCEPT, 0}
+};
+
-+struct ebt_entries {
-+ // this field is always set to zero
-+ // See EBT_ENTRY_OR_ENTRIES.
-+ // Must be same size as ebt_entry.bitmask
-+ unsigned int distinguisher;
-+ // the chain name
-+ char name[EBT_CHAIN_MAXNAMELEN];
-+ // counter offset for this chain
-+ unsigned int counter_offset;
-+ // one standard (accept, drop, return) per hook
-+ int policy;
-+ // nr. of entries
-+ unsigned int nentries;
-+ // entry list
-+ char data[0];
++static struct ebt_replace initial_table =
++{
++ "nat", NAT_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
++ { [NF_BR_PRE_ROUTING]&initial_chains[0], [NF_BR_LOCAL_OUT]&initial_chains[1],
++ [NF_BR_POST_ROUTING]&initial_chains[2] }, 0, NULL, (char *)initial_chains
+};
+
-+// used for the bitmask of struct ebt_entry
++static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
++{
++ if (valid_hooks & ~NAT_VALID_HOOKS)
++ return -EINVAL;
++ return 0;
++}
+
-+// This is a hack to make a difference between an ebt_entry struct and an
-+// ebt_entries struct when traversing the entries from start to end.
-+// Using this simplifies the code alot, while still being able to use
-+// ebt_entries.
-+// Contrary, iptables doesn't use something like ebt_entries and therefore uses
-+// different techniques for naming the policy and such. So, iptables doesn't
-+// need a hack like this.
-+#define EBT_ENTRY_OR_ENTRIES 0x01
-+// these are the normal masks
-+#define EBT_NOPROTO 0x02
-+#define EBT_802_3 0x04
-+#define EBT_SOURCEMAC 0x08
-+#define EBT_DESTMAC 0x10
-+#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \
-+ | EBT_ENTRY_OR_ENTRIES)
-+
-+#define EBT_IPROTO 0x01
-+#define EBT_IIN 0x02
-+#define EBT_IOUT 0x04
-+#define EBT_ISOURCE 0x8
-+#define EBT_IDEST 0x10
-+#define EBT_ILOGICALIN 0x20
-+#define EBT_ILOGICALOUT 0x40
-+#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \
-+ | EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST)
-+
-+struct ebt_entry_match
++static struct ebt_table frame_nat =
+{
-+ union {
-+ char name[EBT_FUNCTION_MAXNAMELEN];
-+ struct ebt_match *match;
-+ } u;
-+ // size of data
-+ unsigned int match_size;
-+ unsigned char data[0];
++ {NULL, NULL}, "nat", &initial_table, NAT_VALID_HOOKS,
++ RW_LOCK_UNLOCKED, check, NULL
+};
+
-+struct ebt_entry_watcher
++static unsigned int
++ebt_nat_dst(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
++ , const struct net_device *out, int (*okfn)(struct sk_buff *))
+{
-+ union {
-+ char name[EBT_FUNCTION_MAXNAMELEN];
-+ struct ebt_watcher *watcher;
-+ } u;
-+ // size of data
-+ unsigned int watcher_size;
-+ unsigned char data[0];
-+};
++ return ebt_do_table(hook, pskb, in, out, &frame_nat);
++}
+
-+struct ebt_entry_target
++static unsigned int
++ebt_nat_src(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
++ , const struct net_device *out, int (*okfn)(struct sk_buff *))
+{
-+ union {
-+ char name[EBT_FUNCTION_MAXNAMELEN];
-+ struct ebt_target *target;
-+ } u;
-+ // size of data
-+ unsigned int target_size;
-+ unsigned char data[0];
++ return ebt_do_table(hook, pskb, in, out, &frame_nat);
++}
++
++static struct nf_hook_ops ebt_ops_nat[] = {
++ { { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_LOCAL_OUT,
++ NF_BR_PRI_NAT_DST_OTHER},
++ { { NULL, NULL }, ebt_nat_src, PF_BRIDGE, NF_BR_POST_ROUTING,
++ NF_BR_PRI_NAT_SRC},
++ { { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_PRE_ROUTING,
++ NF_BR_PRI_NAT_DST_BRIDGED},
+};
+
-+#define EBT_STANDARD_TARGET "standard"
-+struct ebt_standard_target
++static int __init init(void)
+{
-+ struct ebt_entry_target target;
-+ int verdict;
-+};
++ int i, ret, j;
+
-+// one entry
-+struct ebt_entry {
-+ // this needs to be the first field
-+ unsigned int bitmask;
-+ unsigned int invflags;
-+ uint16_t ethproto;
-+ // the physical in-dev
-+ char in[IFNAMSIZ];
-+ // the logical in-dev
-+ char logical_in[IFNAMSIZ];
-+ // the physical out-dev
-+ char out[IFNAMSIZ];
-+ // the logical out-dev
-+ char logical_out[IFNAMSIZ];
-+ unsigned char sourcemac[ETH_ALEN];
-+ unsigned char sourcemsk[ETH_ALEN];
-+ unsigned char destmac[ETH_ALEN];
-+ unsigned char destmsk[ETH_ALEN];
-+ // sizeof ebt_entry + matches
-+ unsigned int watchers_offset;
-+ // sizeof ebt_entry + matches + watchers
-+ unsigned int target_offset;
-+ // sizeof ebt_entry + matches + watchers + target
-+ unsigned int next_offset;
-+ unsigned char elems[0];
-+};
++ ret = ebt_register_table(&frame_nat);
++ if (ret < 0)
++ return ret;
++ for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
++ if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
++ goto cleanup;
++ return ret;
++cleanup:
++ for (j = 0; j < i; j++)
++ nf_unregister_hook(&ebt_ops_nat[j]);
++ ebt_unregister_table(&frame_nat);
++ return ret;
++}
+
-+struct ebt_replace
++static void __exit fini(void)
+{
-+ char name[EBT_TABLE_MAXNAMELEN];
-+ unsigned int valid_hooks;
-+ // nr of rules in the table
-+ unsigned int nentries;
-+ // total size of the entries
-+ unsigned int entries_size;
-+ // start of the chains
-+ struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
-+ // nr of counters userspace expects back
-+ unsigned int num_counters;
-+ // where the kernel will put the old counters
-+ struct ebt_counter *counters;
-+ char *entries;
-+};
-+
-+// [gs]etsockopt numbers
-+#define EBT_BASE_CTL 128
++ int i;
+
-+#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
-+#define EBT_SO_SET_COUNTERS (EBT_SO_SET_ENTRIES+1)
-+#define EBT_SO_SET_MAX (EBT_SO_SET_COUNTERS+1)
++ for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
++ nf_unregister_hook(&ebt_ops_nat[i]);
++ ebt_unregister_table(&frame_nat);
++}
+
-+#define EBT_SO_GET_INFO (EBT_BASE_CTL)
-+#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO+1)
-+#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES+1)
-+#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO+1)
-+#define EBT_SO_GET_MAX (EBT_SO_GET_INIT_ENTRIES+1)
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtable_broute.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,79 @@
++/*
++ * ebtable_broute
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * April, 2002
++ *
++ * This table lets you choose between routing and bridging for frames
++ * entering on a bridge enslaved nic. This table is traversed before any
++ * other ebtables table. See net/bridge/br_input.c.
++ */
+
-+#ifdef __KERNEL__
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/module.h>
++#include <linux/if_bridge.h>
++#include <linux/brlock.h>
+
-+// return values for match() functions
-+#define EBT_MATCH 0
-+#define EBT_NOMATCH 1
++// EBT_ACCEPT means the frame will be bridged
++// EBT_DROP means the frame will be routed
++static struct ebt_entries initial_chain =
++ {0, "BROUTING", 0, EBT_ACCEPT, 0};
+
-+struct ebt_match
++static struct ebt_replace initial_table =
+{
-+ struct list_head list;
-+ const char name[EBT_FUNCTION_MAXNAMELEN];
-+ // 0 == it matches
-+ int (*match)(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *matchdata,
-+ unsigned int datalen);
-+ // 0 == let it in
-+ int (*check)(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *matchdata, unsigned int datalen);
-+ void (*destroy)(void *matchdata, unsigned int datalen);
-+ struct module *me;
++ "broute", 1 << NF_BR_BROUTING, 0, sizeof(struct ebt_entries),
++ { [NF_BR_BROUTING]&initial_chain}, 0, NULL, (char *)&initial_chain
+};
+
-+struct ebt_watcher
++static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
+{
-+ struct list_head list;
-+ const char name[EBT_FUNCTION_MAXNAMELEN];
-+ void (*watcher)(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *watcherdata,
-+ unsigned int datalen);
-+ // 0 == let it in
-+ int (*check)(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *watcherdata, unsigned int datalen);
-+ void (*destroy)(void *watcherdata, unsigned int datalen);
-+ struct module *me;
-+};
++ if (valid_hooks & ~(1 << NF_BR_BROUTING))
++ return -EINVAL;
++ return 0;
++}
+
-+struct ebt_target
++static struct ebt_table broute_table =
+{
-+ struct list_head list;
-+ const char name[EBT_FUNCTION_MAXNAMELEN];
-+ // returns one of the standard verdicts
-+ int (*target)(struct sk_buff **pskb, unsigned int hooknr,
-+ const struct net_device *in, const struct net_device *out,
-+ const void *targetdata, unsigned int datalen);
-+ // 0 == let it in
-+ int (*check)(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *targetdata, unsigned int datalen);
-+ void (*destroy)(void *targetdata, unsigned int datalen);
-+ struct module *me;
++ {NULL, NULL}, "broute", &initial_table, 1 << NF_BR_BROUTING,
++ RW_LOCK_UNLOCKED, check, NULL
+};
+
-+// used for jumping from and into user defined chains (udc)
-+struct ebt_chainstack
++static int ebt_broute(struct sk_buff **pskb)
+{
-+ struct ebt_entries *chaininfo; // pointer to chain data
-+ struct ebt_entry *e; // pointer to entry data
-+ unsigned int n; // n'th entry
-+};
++ int ret;
+
-+struct ebt_table_info
-+{
-+ // total size of the entries
-+ unsigned int entries_size;
-+ unsigned int nentries;
-+ // pointers to the start of the chains
-+ struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
-+ // room to maintain the stack used for jumping from and into udc
-+ struct ebt_chainstack **chainstack;
-+ char *entries;
-+ struct ebt_counter counters[0] ____cacheline_aligned;
-+};
++ ret = ebt_do_table(NF_BR_BROUTING, pskb, (*pskb)->dev, NULL,
++ &broute_table);
++ if (ret == NF_DROP)
++ return 1; // route it
++ return 0; // bridge it
++}
+
-+struct ebt_table
++static int __init init(void)
+{
-+ struct list_head list;
-+ char name[EBT_TABLE_MAXNAMELEN];
-+ struct ebt_replace *table;
-+ unsigned int valid_hooks;
-+ rwlock_t lock;
-+ // e.g. could be the table explicitly only allows certain
-+ // matches, targets, ... 0 == let it in
-+ int (*check)(const struct ebt_table_info *info,
-+ unsigned int valid_hooks);
-+ // the data used by the kernel
-+ struct ebt_table_info *private;
-+};
++ int ret;
+
-+#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_entry_target)-1)) & \
-+ ~(__alignof__(struct ebt_entry_target)-1))
-+extern int ebt_register_table(struct ebt_table *table);
-+extern void ebt_unregister_table(struct ebt_table *table);
-+extern int ebt_register_match(struct ebt_match *match);
-+extern void ebt_unregister_match(struct ebt_match *match);
-+extern int ebt_register_watcher(struct ebt_watcher *watcher);
-+extern void ebt_unregister_watcher(struct ebt_watcher *watcher);
-+extern int ebt_register_target(struct ebt_target *target);
-+extern void ebt_unregister_target(struct ebt_target *target);
-+extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ struct ebt_table *table);
++ ret = ebt_register_table(&broute_table);
++ if (ret < 0)
++ return ret;
++ br_write_lock_bh(BR_NETPROTO_LOCK);
++ // see br_input.c
++ br_should_route_hook = ebt_broute;
++ br_write_unlock_bh(BR_NETPROTO_LOCK);
++ return ret;
++}
+
-+ // Used in the kernel match() functions
-+#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))
-+// True if the hook mask denotes that the rule is in a base chain,
-+// used in the check() functions
-+#define BASE_CHAIN (hookmask & (1 << NF_BR_NUMHOOKS))
-+// Clear the bit in the hook mask that tells if the rule is on a base chain
-+#define CLEAR_BASE_CHAIN_BIT (hookmask &= ~(1 << NF_BR_NUMHOOKS))
-+// True if the target is not a standard target
-+#define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
++static void __exit fini(void)
++{
++ br_write_lock_bh(BR_NETPROTO_LOCK);
++ br_should_route_hook = NULL;
++ br_write_unlock_bh(BR_NETPROTO_LOCK);
++ ebt_unregister_table(&broute_table);
++}
+
-+#endif /* __KERNEL__ */
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_802_3.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,74 @@
++/*
++ * 802_3
++ *
++ * Author:
++ * Chris Vitale csv@bluetail.com
++ *
++ * May 2003
++ *
++ */
+
-+// blatently stolen from ip_tables.h
-+// fn returns 0 to continue iteration
-+#define EBT_MATCH_ITERATE(e, fn, args...) \
-+({ \
-+ unsigned int __i; \
-+ int __ret = 0; \
-+ struct ebt_entry_match *__match; \
-+ \
-+ for (__i = sizeof(struct ebt_entry); \
-+ __i < (e)->watchers_offset; \
-+ __i += __match->match_size + \
-+ sizeof(struct ebt_entry_match)) { \
-+ __match = (void *)(e) + __i; \
-+ \
-+ __ret = fn(__match , ## args); \
-+ if (__ret != 0) \
-+ break; \
-+ } \
-+ if (__ret == 0) { \
-+ if (__i != (e)->watchers_offset) \
-+ __ret = -EINVAL; \
-+ } \
-+ __ret; \
-+})
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_802_3.h>
++#include <linux/module.h>
+
-+#define EBT_WATCHER_ITERATE(e, fn, args...) \
-+({ \
-+ unsigned int __i; \
-+ int __ret = 0; \
-+ struct ebt_entry_watcher *__watcher; \
-+ \
-+ for (__i = e->watchers_offset; \
-+ __i < (e)->target_offset; \
-+ __i += __watcher->watcher_size + \
-+ sizeof(struct ebt_entry_watcher)) { \
-+ __watcher = (void *)(e) + __i; \
-+ \
-+ __ret = fn(__watcher , ## args); \
-+ if (__ret != 0) \
-+ break; \
-+ } \
-+ if (__ret == 0) { \
-+ if (__i != (e)->target_offset) \
-+ __ret = -EINVAL; \
-+ } \
-+ __ret; \
-+})
++static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *data, unsigned int datalen)
++{
++ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
++ struct ebt_802_3_hdr *hdr = (struct ebt_802_3_hdr *)skb->mac.ethernet;
++ uint16_t type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
+
-+#define EBT_ENTRY_ITERATE(entries, size, fn, args...) \
-+({ \
-+ unsigned int __i; \
-+ int __ret = 0; \
-+ struct ebt_entry *__entry; \
-+ \
-+ for (__i = 0; __i < (size);) { \
-+ __entry = (void *)(entries) + __i; \
-+ __ret = fn(__entry , ## args); \
-+ if (__ret != 0) \
-+ break; \
-+ if (__entry->bitmask != 0) \
-+ __i += __entry->next_offset; \
-+ else \
-+ __i += sizeof(struct ebt_entries); \
-+ } \
-+ if (__ret == 0) { \
-+ if (__i != (size)) \
-+ __ret = -EINVAL; \
-+ } \
-+ __ret; \
-+})
++ if (info->bitmask & EBT_802_3_SAP) {
++ if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
++ return EBT_NOMATCH;
++ if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
++ return EBT_NOMATCH;
++ }
+
-+#endif
-diff -Nurb linux.stock/include/linux/netfilter_bridge.h linux/include/linux/netfilter_bridge.h
---- linux.stock/include/linux/netfilter_bridge.h 2003-07-04 04:12:26.000000000 -0400
-+++ linux/include/linux/netfilter_bridge.h 2004-07-10 23:46:39.000000000 -0400
-@@ -6,6 +6,10 @@
-
- #include <linux/config.h>
- #include <linux/netfilter.h>
-+#if defined(__KERNEL__) && defined(CONFIG_NETFILTER)
-+#include <asm/atomic.h>
-+#include <linux/if_ether.h>
-+#endif
-
- /* Bridge Hooks */
- /* After promisc drops, checksum checks. */
-@@ -18,7 +22,76 @@
- #define NF_BR_LOCAL_OUT 3
- /* Packets about to hit the wire. */
- #define NF_BR_POST_ROUTING 4
--#define NF_BR_NUMHOOKS 5
-+/* Not really a hook, but used for the ebtables broute table */
-+#define NF_BR_BROUTING 5
-+#define NF_BR_NUMHOOKS 6
++ if (info->bitmask & EBT_802_3_TYPE) {
++ if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
++ return EBT_NOMATCH;
++ if (FWINV(info->type != type, EBT_802_3_TYPE))
++ return EBT_NOMATCH;
++ }
+
-+#ifdef __KERNEL__
++ return EBT_MATCH;
++}
+
-+#define BRNF_PKT_TYPE 0x01
-+#define BRNF_BRIDGED_DNAT 0x02
-+#define BRNF_DONT_TAKE_PARENT 0x04
-+#define BRNF_BRIDGED 0x08
-+#define BRNF_NF_BRIDGE_PREROUTING 0x10
++static struct ebt_match filter_802_3;
++static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
+
-+enum nf_br_hook_priorities {
-+ NF_BR_PRI_FIRST = INT_MIN,
-+ NF_BR_PRI_NAT_DST_BRIDGED = -300,
-+ NF_BR_PRI_FILTER_BRIDGED = -200,
-+ NF_BR_PRI_BRNF = 0,
-+ NF_BR_PRI_NAT_DST_OTHER = 100,
-+ NF_BR_PRI_FILTER_OTHER = 200,
-+ NF_BR_PRI_NAT_SRC = 300,
-+ NF_BR_PRI_LAST = INT_MAX,
-+};
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_802_3_info)))
++ return -EINVAL;
++ if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
++ return -EINVAL;
+
-+#ifdef CONFIG_NETFILTER
-+static inline
-+struct nf_bridge_info *nf_bridge_alloc(struct sk_buff *skb)
++ return 0;
++}
++
++static struct ebt_match filter_802_3 =
+{
-+ struct nf_bridge_info **nf_bridge = &(skb->nf_bridge);
++ .name = EBT_802_3_MATCH,
++ .match = ebt_filter_802_3,
++ .check = ebt_802_3_check,
++ .me = THIS_MODULE,
++};
+
-+ if ((*nf_bridge = kmalloc(sizeof(**nf_bridge), GFP_ATOMIC)) != NULL) {
-+ atomic_set(&(*nf_bridge)->use, 1);
-+ (*nf_bridge)->mask = 0;
-+ (*nf_bridge)->physindev = (*nf_bridge)->physoutdev = NULL;
-+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-+ (*nf_bridge)->netoutdev = NULL;
-+#endif
-+ }
++static int __init init(void)
++{
++ return ebt_register_match(&filter_802_3);
++}
+
-+ return *nf_bridge;
++static void __exit fini(void)
++{
++ ebt_unregister_match(&filter_802_3);
+}
+
-+/* Only used in br_forward.c */
-+static inline
-+void nf_bridge_maybe_copy_header(struct sk_buff *skb)
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_mark.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,66 @@
++/*
++ * ebt_mark
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * July, 2002
++ *
++ */
++
++// The mark target can be used in any chain
++// I believe adding a mangle table just for marking is total overkill
++// Marking a frame doesn't really change anything in the frame anyway
++
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_mark_t.h>
++#include <linux/module.h>
++
++static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr,
++ const struct net_device *in, const struct net_device *out,
++ const void *data, unsigned int datalen)
+{
-+ if (skb->nf_bridge) {
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ memcpy(skb->data - 18, skb->nf_bridge->data, 18);
-+ skb_push(skb, 4);
-+ } else
-+ memcpy(skb->data - 16, skb->nf_bridge->data, 16);
++ struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
++
++ if ((*pskb)->nfmark != info->mark) {
++ (*pskb)->nfmark = info->mark;
++ (*pskb)->nfcache |= NFC_ALTERED;
+ }
++ return info->target;
+}
+
-+static inline
-+void nf_bridge_save_header(struct sk_buff *skb)
++static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+ int header_size = 16;
++ struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
+
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q))
-+ header_size = 18;
-+ memcpy(skb->nf_bridge->data, skb->data - header_size, header_size);
-+}
-
-+struct bridge_skb_cb {
-+ union {
-+ __u32 ipv4;
-+ } daddr;
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
++ return -EINVAL;
++ if (BASE_CHAIN && info->target == EBT_RETURN)
++ return -EINVAL;
++ CLEAR_BASE_CHAIN_BIT;
++ if (INVALID_TARGET)
++ return -EINVAL;
++ return 0;
++}
++
++static struct ebt_target mark_target =
++{
++ {NULL, NULL}, EBT_MARK_TARGET, ebt_target_mark,
++ ebt_target_mark_check, NULL, THIS_MODULE
+};
-+#endif /* CONFIG_NETFILTER */
-
-+#endif /* __KERNEL__ */
- #endif
-diff -Nurb linux.stock/include/linux/netfilter_ipv4/ipt_physdev.h linux/include/linux/netfilter_ipv4/ipt_physdev.h
---- linux.stock/include/linux/netfilter_ipv4/ipt_physdev.h 1969-12-31 19:00:00.000000000 -0500
-+++ linux/include/linux/netfilter_ipv4/ipt_physdev.h 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,24 @@
-+#ifndef _IPT_PHYSDEV_H
-+#define _IPT_PHYSDEV_H
+
-+#ifdef __KERNEL__
-+#include <linux/if.h>
-+#endif
++static int __init init(void)
++{
++ return ebt_register_target(&mark_target);
++}
+
-+#define IPT_PHYSDEV_OP_IN 0x01
-+#define IPT_PHYSDEV_OP_OUT 0x02
-+#define IPT_PHYSDEV_OP_BRIDGED 0x04
-+#define IPT_PHYSDEV_OP_ISIN 0x08
-+#define IPT_PHYSDEV_OP_ISOUT 0x10
-+#define IPT_PHYSDEV_OP_MASK (0x20 - 1)
++static void __exit fini(void)
++{
++ ebt_unregister_target(&mark_target);
++}
+
-+struct ipt_physdev_info {
-+ char physindev[IFNAMSIZ];
-+ char in_mask[IFNAMSIZ];
-+ char physoutdev[IFNAMSIZ];
-+ char out_mask[IFNAMSIZ];
-+ u_int8_t invert;
-+ u_int8_t bitmask;
-+};
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_mark_m.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,61 @@
++/*
++ * ebt_mark_m
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * July, 2002
++ *
++ */
+
-+#endif /*_IPT_PHYSDEV_H*/
-diff -Nurb linux.stock/include/linux/netfilter_ipv4.h linux/include/linux/netfilter_ipv4.h
---- linux.stock/include/linux/netfilter_ipv4.h 2004-07-10 23:30:09.000000000 -0400
-+++ linux/include/linux/netfilter_ipv4.h 2004-07-10 23:46:39.000000000 -0400
-@@ -54,8 +54,10 @@
- NF_IP_PRI_CONNTRACK_DEFRAG = -400,
- NF_IP_PRI_RAW = -300,
- NF_IP_PRI_CONNTRACK = -200,
-+ NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
- NF_IP_PRI_MANGLE = -150,
- NF_IP_PRI_NAT_DST = -100,
-+ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
- NF_IP_PRI_FILTER = 0,
- NF_IP_PRI_NAT_SRC = 100,
- NF_IP_PRI_LAST = INT_MAX,
-diff -Nurb linux.stock/include/linux/skbuff.h linux/include/linux/skbuff.h
---- linux.stock/include/linux/skbuff.h 2003-07-04 04:12:26.000000000 -0400
-+++ linux/include/linux/skbuff.h 2004-07-10 23:46:39.000000000 -0400
-@@ -92,6 +92,20 @@
- struct nf_ct_info {
- struct nf_conntrack *master;
- };
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_mark_m.h>
++#include <linux/module.h>
+
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+struct nf_bridge_info {
-+ atomic_t use;
-+ struct net_device *physindev;
-+ struct net_device *physoutdev;
-+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-+ struct net_device *netoutdev;
-+#endif
-+ unsigned int mask;
-+ unsigned long data[32 / sizeof(unsigned long)];
-+};
-+#endif
++static int ebt_filter_mark(const struct sk_buff *skb,
++ const struct net_device *in, const struct net_device *out, const void *data,
++ unsigned int datalen)
++{
++ struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
+
- #endif
-
- struct sk_buff_head {
-@@ -204,6 +218,9 @@
- #ifdef CONFIG_NETFILTER_DEBUG
- unsigned int nf_debug;
- #endif
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ struct nf_bridge_info *nf_bridge; /* Saved data about a bridged frame - see br_netfilter.c */
-+#endif
- #endif /*CONFIG_NETFILTER*/
-
- #if defined(CONFIG_HIPPI)
-@@ -1143,6 +1160,20 @@
- if (nfct)
- atomic_inc(&nfct->master->use);
- }
++ if (info->bitmask & EBT_MARK_OR)
++ return !(!!(skb->nfmark & info->mask) ^ info->invert);
++ return !(((skb->nfmark & info->mask) == info->mark) ^ info->invert);
++}
+
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
++static int ebt_mark_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+ if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
-+ kfree(nf_bridge);
++ struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
++
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
++ return -EINVAL;
++ if (info->bitmask & ~EBT_MARK_MASK)
++ return -EINVAL;
++ if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
++ return -EINVAL;
++ if (!info->bitmask)
++ return -EINVAL;
++ return 0;
+}
-+static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
++
++static struct ebt_match filter_mark =
+{
-+ if (nf_bridge)
-+ atomic_inc(&nf_bridge->use);
++ {NULL, NULL}, EBT_MARK_MATCH, ebt_filter_mark, ebt_mark_check, NULL,
++ THIS_MODULE
++};
++
++static int __init init(void)
++{
++ return ebt_register_match(&filter_mark);
+}
-+#endif
+
- #endif
-
- #endif /* __KERNEL__ */
-diff -Nurb linux.stock/include/linux/sysctl.h linux/include/linux/sysctl.h
---- linux.stock/include/linux/sysctl.h 2004-07-10 23:29:55.000000000 -0400
-+++ linux/include/linux/sysctl.h 2004-07-10 23:46:39.000000000 -0400
-@@ -547,6 +547,15 @@
- NET_DECNET_CONF_DEV_STATE = 7
- };
-
-+/* /proc/sys/net/bridge */
-+enum {
-+ NET_BRIDGE_NF_CALL_ARPTABLES = 1,
-+ NET_BRIDGE_NF_CALL_IPTABLES = 2,
-+ NET_BRIDGE_NF_CALL_IP6TABLES = 3,
-+ NET_BRIDGE_NF_FILTER_VLAN_TAGGED = 4,
-+};
++static void __exit fini(void)
++{
++ ebt_unregister_match(&filter_mark);
++}
+
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_pkttype.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,60 @@
++/*
++ * ebt_pkttype
++ *
++ * Authors:
++ * Bart De Schuymer <bdschuym@pandora.be>
++ *
++ * April, 2003
++ *
++ */
+
- /* CTL_PROC names: */
-
- /* CTL_FS names: */
-diff -Nurb linux.stock/net/8021q/vlan_dev.c linux/net/8021q/vlan_dev.c
---- linux.stock/net/8021q/vlan_dev.c 2003-07-04 04:12:29.000000000 -0400
-+++ linux/net/8021q/vlan_dev.c 2004-07-10 23:46:39.000000000 -0400
-@@ -503,6 +503,10 @@
- stats->tx_packets++; /* for statics only */
- stats->tx_bytes += skb->len;
-
-+ skb->protocol = __constant_htons(ETH_P_8021Q);
-+ skb->mac.raw -= VLAN_HLEN;
-+ skb->nh.raw -= VLAN_HLEN;
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_pkttype.h>
++#include <linux/module.h>
+
- dev_queue_xmit(skb);
-
- return 0;
-diff -Nurb linux.stock/net/Config.in linux/net/Config.in
---- linux.stock/net/Config.in 2004-07-10 23:29:49.000000000 -0400
-+++ linux/net/Config.in 2004-07-10 23:46:39.000000000 -0400
-@@ -68,6 +68,9 @@
- source net/decnet/Config.in
- fi
- dep_tristate '802.1d Ethernet Bridging' CONFIG_BRIDGE $CONFIG_INET
-+if [ "$CONFIG_BRIDGE" != "n" -a "$CONFIG_NETFILTER" != "n" ]; then
-+ source net/bridge/netfilter/Config.in
-+fi
- if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
- tristate 'CCITT X.25 Packet Layer (EXPERIMENTAL)' CONFIG_X25
- tristate 'LAPB Data Link Driver (EXPERIMENTAL)' CONFIG_LAPB
-diff -Nurb linux.stock/net/Makefile linux/net/Makefile
---- linux.stock/net/Makefile 2004-07-10 23:29:49.000000000 -0400
-+++ linux/net/Makefile 2004-07-10 23:49:10.000000000 -0400
-@@ -26,6 +26,12 @@
- endif
- endif
-
-+ifneq ($(CONFIG_BRIDGE),n)
-+ifneq ($(CONFIG_BRIDGE),)
-+subdir-$(CONFIG_BRIDGE) += bridge/netfilter
-+endif
-+endif
++static int ebt_filter_pkttype(const struct sk_buff *skb,
++ const struct net_device *in,
++ const struct net_device *out,
++ const void *data,
++ unsigned int datalen)
++{
++ struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
+
- subdir-$(CONFIG_KHTTPD) += khttpd
- subdir-$(CONFIG_PACKET) += packet
- subdir-$(CONFIG_NET_SCHED) += sched
-diff -Nurb linux.stock/net/bridge/Makefile linux/net/bridge/Makefile
---- linux.stock/net/bridge/Makefile 2003-07-04 04:12:30.000000000 -0400
-+++ linux/net/bridge/Makefile 2004-07-10 23:46:39.000000000 -0400
-@@ -7,10 +7,17 @@
- #
- # Note 2! The CFLAGS definition is now in the main makefile...
-
-+export-objs := br.o
++ return (skb->pkt_type != info->pkt_type) ^ info->invert;
++}
+
- O_TARGET := bridge.o
- obj-y := br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
- br_ioctl.o br_notify.o br_stp.o br_stp_bpdu.o \
- br_stp_if.o br_stp_timer.o
++static int ebt_pkttype_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++ struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
+
-+ifeq ($(CONFIG_NETFILTER),y)
-+obj-y += br_netfilter.o
-+endif
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_pkttype_info)))
++ return -EINVAL;
++ if (info->invert != 0 && info->invert != 1)
++ return -EINVAL;
++ /* Allow any pkt_type value */
++ return 0;
++}
+
- obj-m := $(O_TARGET)
-
- include $(TOPDIR)/Rules.make
-diff -Nurb linux.stock/net/bridge/br.c linux/net/bridge/br.c
---- linux.stock/net/bridge/br.c 2003-10-14 04:09:32.000000000 -0400
-+++ linux/net/bridge/br.c 2004-07-10 23:46:39.000000000 -0400
-@@ -29,6 +29,8 @@
- #include "../atm/lec.h"
- #endif
-
-+int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
++static struct ebt_match filter_pkttype =
++{
++ .name = EBT_PKTTYPE_MATCH,
++ .match = ebt_filter_pkttype,
++ .check = ebt_pkttype_check,
++ .me = THIS_MODULE,
++};
+
- void br_dec_use_count()
- {
- MOD_DEC_USE_COUNT;
-@@ -43,6 +45,10 @@
- {
- printk(KERN_INFO "NET4: Ethernet Bridge 008 for NET4.0\n");
-
-+#ifdef CONFIG_NETFILTER
-+ if (br_netfilter_init())
-+ return 1;
-+#endif
- br_handle_frame_hook = br_handle_frame;
- br_ioctl_hook = br_ioctl_deviceless_stub;
- #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
-@@ -61,6 +67,9 @@
-
- static void __exit br_deinit(void)
- {
-+#ifdef CONFIG_NETFILTER
-+ br_netfilter_fini();
-+#endif
- unregister_netdevice_notifier(&br_device_notifier);
- br_call_ioctl_atomic(__br_clear_ioctl_hook);
-
-@@ -74,7 +83,7 @@
- #endif
- }
-
--EXPORT_NO_SYMBOLS;
-+EXPORT_SYMBOL(br_should_route_hook);
-
- module_init(br_init)
- module_exit(br_deinit)
-diff -Nurb linux.stock/net/bridge/br_forward.c linux/net/bridge/br_forward.c
---- linux.stock/net/bridge/br_forward.c 2003-10-14 04:09:32.000000000 -0400
-+++ linux/net/bridge/br_forward.c 2004-07-10 23:46:39.000000000 -0400
-@@ -30,18 +30,21 @@
- return 1;
- }
-
--static int __dev_queue_push_xmit(struct sk_buff *skb)
-+int br_dev_queue_push_xmit(struct sk_buff *skb)
- {
-+#ifdef CONFIG_NETFILTER
-+ nf_bridge_maybe_copy_header(skb);
-+#endif
- skb_push(skb, ETH_HLEN);
- dev_queue_xmit(skb);
-
- return 0;
- }
-
--static int __br_forward_finish(struct sk_buff *skb)
-+int br_forward_finish(struct sk_buff *skb)
- {
- NF_HOOK(PF_BRIDGE, NF_BR_POST_ROUTING, skb, NULL, skb->dev,
-- __dev_queue_push_xmit);
-+ br_dev_queue_push_xmit);
-
- return 0;
- }
-@@ -49,8 +52,11 @@
- static void __br_deliver(struct net_bridge_port *to, struct sk_buff *skb)
- {
- skb->dev = to->dev;
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug = 0;
-+#endif
- NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
-- __br_forward_finish);
-+ br_forward_finish);
- }
-
- static void __br_forward(struct net_bridge_port *to, struct sk_buff *skb)
-@@ -61,7 +67,7 @@
- skb->dev = to->dev;
-
- NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, indev, skb->dev,
-- __br_forward_finish);
-+ br_forward_finish);
- }
-
- /* called under bridge lock */
-diff -Nurb linux.stock/net/bridge/br_input.c linux/net/bridge/br_input.c
---- linux.stock/net/bridge/br_input.c 2003-10-14 04:09:32.000000000 -0400
-+++ linux/net/bridge/br_input.c 2004-07-10 23:48:36.000000000 -0400
-@@ -24,6 +24,9 @@
-
- static int br_pass_frame_up_finish(struct sk_buff *skb)
- {
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug = 0;
-+#endif
- netif_rx(skb);
-
- return 0;
-@@ -46,7 +49,7 @@
- br_pass_frame_up_finish);
- }
-
--static int br_handle_frame_finish(struct sk_buff *skb)
-+int br_handle_frame_finish(struct sk_buff *skb)
- {
- struct net_bridge *br;
- unsigned char *dest;
-@@ -112,7 +115,7 @@
- return 0;
- }
-
--void br_handle_frame(struct sk_buff *skb)
-+int br_handle_frame(struct sk_buff *skb)
- {
- struct net_bridge *br;
- unsigned char *dest;
-@@ -146,25 +149,34 @@
- goto handle_special_frame;
-
- if (p->state == BR_STATE_FORWARDING) {
-+ if (br_should_route_hook && br_should_route_hook(&skb)) {
-+ read_unlock(&br->lock);
-+ return -1;
-+ }
-+
-+ if (!memcmp(p->br->dev.dev_addr, dest, ETH_ALEN))
-+ skb->pkt_type = PACKET_HOST;
-+
- NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
- br_handle_frame_finish);
- read_unlock(&br->lock);
-- return;
-+ return 0;
- }
-
- err:
- read_unlock(&br->lock);
- err_nolock:
- kfree_skb(skb);
-- return;
-+ return 0;
-
- handle_special_frame:
- if (!dest[5]) {
- br_stp_handle_bpdu(skb);
- read_unlock(&br->lock);
-- return;
-+ return 0;
- }
-
- read_unlock(&br->lock);
- kfree_skb(skb);
-+ return 0;
- }
-diff -Nurb linux.stock/net/bridge/br_netfilter.c linux/net/bridge/br_netfilter.c
---- linux.stock/net/bridge/br_netfilter.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/br_netfilter.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,896 @@
++static int __init init(void)
++{
++ return ebt_register_match(&filter_pkttype);
++}
++
++static void __exit fini(void)
++{
++ ebt_unregister_match(&filter_pkttype);
++}
++
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_stp.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,191 @@
+/*
-+ * Handle firewalling
-+ * Linux ethernet bridge
++ * ebt_stp
+ *
+ * Authors:
-+ * Lennert Buytenhek <buytenh@gnu.org>
-+ * Bart De Schuymer (maintainer) <bdschuym@pandora.be>
-+ *
-+ * Changes:
-+ * Apr 29 2003: physdev module support (bdschuym)
-+ * Jun 19 2003: let arptables see bridged ARP traffic (bdschuym)
-+ * Oct 06 2003: filter encapsulated IP/ARP VLAN traffic on untagged bridge
-+ * (bdschuym)
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
++ * Bart De Schuymer <bdschuym@pandora.be>
++ * Stephen Hemminger <shemminger@osdl.org>
+ *
-+ * Lennert dedicates this file to Kerstin Wurdinger.
++ * June, 2003
+ */
+
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_stp.h>
+#include <linux/module.h>
-+#include <linux/kernel.h>
-+#include <linux/ip.h>
-+#include <linux/netdevice.h>
-+#include <linux/skbuff.h>
-+#include <linux/if_ether.h>
-+#include <linux/if_vlan.h>
-+#include <linux/netfilter_bridge.h>
-+#include <linux/netfilter_ipv4.h>
-+#include <linux/in_route.h>
-+#include <net/ip.h>
-+#include <asm/uaccess.h>
-+#include <asm/checksum.h>
-+#include "br_private.h"
-+#ifdef CONFIG_SYSCTL
-+#include <linux/sysctl.h>
-+#endif
-+
-+
-+#define skb_origaddr(skb) (((struct bridge_skb_cb *) \
-+ (skb->nf_bridge->data))->daddr.ipv4)
-+#define store_orig_dstaddr(skb) (skb_origaddr(skb) = (skb)->nh.iph->daddr)
-+#define dnat_took_place(skb) (skb_origaddr(skb) != (skb)->nh.iph->daddr)
+
-+#define has_bridge_parent(device) ((device)->br_port != NULL)
-+#define bridge_parent(device) (&((device)->br_port->br->dev))
-+
-+#ifdef CONFIG_SYSCTL
-+static struct ctl_table_header *brnf_sysctl_header;
-+static int brnf_call_iptables = 1;
-+static int brnf_call_arptables = 1;
-+static int brnf_filter_vlan_tagged = 1;
-+#else
-+#define brnf_filter_vlan_tagged 1
-+#endif
-+
-+#define IS_VLAN_IP (skb->protocol == __constant_htons(ETH_P_8021Q) && \
-+ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_IP) && \
-+ brnf_filter_vlan_tagged)
-+/*
-+#define IS_VLAN_ARP (skb->protocol == __constant_htons(ETH_P_8021Q) && \
-+ hdr->h_vlan_encapsulated_proto == __constant_htons(ETH_P_ARP) && \
-+ brnf_filter_vlan_tagged)
-+*/
++#define BPDU_TYPE_CONFIG 0
++#define BPDU_TYPE_TCN 0x80
+
-+/* We need these fake structures to make netfilter happy --
-+ * lots of places assume that skb->dst != NULL, which isn't
-+ * all that unreasonable.
-+ *
-+ * Currently, we fill in the PMTU entry because netfilter
-+ * refragmentation needs it, and the rt_flags entry because
-+ * ipt_REJECT needs it. Future netfilter modules might
-+ * require us to fill additional fields.
-+ */
-+static struct net_device __fake_net_device = {
-+ .hard_header_len = ETH_HLEN
++struct stp_header {
++ uint8_t dsap;
++ uint8_t ssap;
++ uint8_t ctrl;
++ uint8_t pid;
++ uint8_t vers;
++ uint8_t type;
+};
+
-+static struct rtable __fake_rtable = {
-+ u: {
-+ dst: {
-+ __refcnt: ATOMIC_INIT(1),
-+ dev: &__fake_net_device,
-+ pmtu: 1500
-+ }
-+ },
-+
-+ rt_flags: 0
++struct stp_config_pdu {
++ uint8_t flags;
++ uint8_t root[8];
++ uint8_t root_cost[4];
++ uint8_t sender[8];
++ uint8_t port[2];
++ uint8_t msg_age[2];
++ uint8_t max_age[2];
++ uint8_t hello_time[2];
++ uint8_t forward_delay[2];
+};
+
++#define NR16(p) (p[0] << 8 | p[1])
++#define NR32(p) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
+
-+/* PF_BRIDGE/PRE_ROUTING *********************************************/
-+static void __br_dnat_complain(void)
++static int ebt_filter_config(struct ebt_stp_info *info,
++ struct stp_config_pdu *stpc)
+{
-+ static unsigned long last_complaint;
++ struct ebt_stp_config_info *c;
++ uint16_t v16;
++ uint32_t v32;
++ int verdict, i;
+
-+ if (jiffies - last_complaint >= 5 * HZ) {
-+ printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
-+ "forwarding to be enabled\n");
-+ last_complaint = jiffies;
++ c = &info->config;
++ if ((info->bitmask & EBT_STP_FLAGS) &&
++ FWINV(c->flags != stpc->flags, EBT_STP_FLAGS))
++ return EBT_NOMATCH;
++ if (info->bitmask & EBT_STP_ROOTPRIO) {
++ v16 = NR16(stpc->root);
++ if (FWINV(v16 < c->root_priol ||
++ v16 > c->root_priou, EBT_STP_ROOTPRIO))
++ return EBT_NOMATCH;
+ }
-+}
-+
-+
-+/* This requires some explaining. If DNAT has taken place,
-+ * we will need to fix up the destination Ethernet address,
-+ * and this is a tricky process.
-+ *
-+ * There are two cases to consider:
-+ * 1. The packet was DNAT'ed to a device in the same bridge
-+ * port group as it was received on. We can still bridge
-+ * the packet.
-+ * 2. The packet was DNAT'ed to a different device, either
-+ * a non-bridged device or another bridge port group.
-+ * The packet will need to be routed.
-+ *
-+ * The correct way of distinguishing between these two cases is to
-+ * call ip_route_input() and to look at skb->dst->dev, which is
-+ * changed to the destination device if ip_route_input() succeeds.
-+ *
-+ * Let us first consider the case that ip_route_input() succeeds:
-+ *
-+ * If skb->dst->dev equals the logical bridge device the packet
-+ * came in on, we can consider this bridging. We then call
-+ * skb->dst->output() which will make the packet enter br_nf_local_out()
-+ * not much later. In that function it is assured that the iptables
-+ * FORWARD chain is traversed for the packet.
-+ *
-+ * Otherwise, the packet is considered to be routed and we just
-+ * change the destination MAC address so that the packet will
-+ * later be passed up to the IP stack to be routed.
-+ *
-+ * Let us now consider the case that ip_route_input() fails:
-+ *
-+ * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input()
-+ * will fail, while __ip_route_output_key() will return success. The source
-+ * address for __ip_route_output_key() is set to zero, so __ip_route_output_key
-+ * thinks we're handling a locally generated packet and won't care
-+ * if IP forwarding is allowed. We send a warning message to the users's
-+ * log telling her to put IP forwarding on.
-+ *
-+ * ip_route_input() will also fail if there is no route available.
-+ * In that case we just drop the packet.
-+ *
-+ * --Lennert, 20020411
-+ * --Bart, 20020416 (updated)
-+ * --Bart, 20021007 (updated)
-+ */
-+
-+static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
-+{
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug |= (1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_FORWARD);
-+#endif
-+
-+ if (skb->pkt_type == PACKET_OTHERHOST) {
-+ skb->pkt_type = PACKET_HOST;
-+ skb->nf_bridge->mask |= BRNF_PKT_TYPE;
++ if (info->bitmask & EBT_STP_ROOTADDR) {
++ verdict = 0;
++ for (i = 0; i < 6; i++)
++ verdict |= (stpc->root[2+i] ^ c->root_addr[i]) &
++ c->root_addrmsk[i];
++ if (FWINV(verdict != 0, EBT_STP_ROOTADDR))
++ return EBT_NOMATCH;
+ }
-+ skb->nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
-+
-+ skb->dev = bridge_parent(skb->dev);
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_pull(skb, VLAN_HLEN);
-+ skb->nh.raw += VLAN_HLEN;
++ if (info->bitmask & EBT_STP_ROOTCOST) {
++ v32 = NR32(stpc->root_cost);
++ if (FWINV(v32 < c->root_costl ||
++ v32 > c->root_costu, EBT_STP_ROOTCOST))
++ return EBT_NOMATCH;
+ }
-+ skb->dst->output(skb);
-+ return 0;
++ if (info->bitmask & EBT_STP_SENDERPRIO) {
++ v16 = NR16(stpc->sender);
++ if (FWINV(v16 < c->sender_priol ||
++ v16 > c->sender_priou, EBT_STP_SENDERPRIO))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_STP_SENDERADDR) {
++ verdict = 0;
++ for (i = 0; i < 6; i++)
++ verdict |= (stpc->sender[2+i] ^ c->sender_addr[i]) &
++ c->sender_addrmsk[i];
++ if (FWINV(verdict != 0, EBT_STP_SENDERADDR))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_STP_PORT) {
++ v16 = NR16(stpc->port);
++ if (FWINV(v16 < c->portl ||
++ v16 > c->portu, EBT_STP_PORT))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_STP_MSGAGE) {
++ v16 = NR16(stpc->msg_age);
++ if (FWINV(v16 < c->msg_agel ||
++ v16 > c->msg_ageu, EBT_STP_MSGAGE))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_STP_MAXAGE) {
++ v16 = NR16(stpc->max_age);
++ if (FWINV(v16 < c->max_agel ||
++ v16 > c->max_ageu, EBT_STP_MAXAGE))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_STP_HELLOTIME) {
++ v16 = NR16(stpc->hello_time);
++ if (FWINV(v16 < c->hello_timel ||
++ v16 > c->hello_timeu, EBT_STP_HELLOTIME))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_STP_FWDD) {
++ v16 = NR16(stpc->forward_delay);
++ if (FWINV(v16 < c->forward_delayl ||
++ v16 > c->forward_delayu, EBT_STP_FWDD))
++ return EBT_NOMATCH;
++ }
++ return EBT_MATCH;
+}
+
-+static int br_nf_pre_routing_finish(struct sk_buff *skb)
++static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *data, unsigned int datalen)
+{
-+ struct net_device *dev = skb->dev;
-+ struct iphdr *iph = skb->nh.iph;
-+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
++ struct ebt_stp_info *info = (struct ebt_stp_info *)data;
++ struct stp_header stph;
++ uint8_t header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
++ if (skb_copy_bits(skb, 0, &stph, sizeof(stph)))
++ return EBT_NOMATCH;
+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug ^= (1 << NF_BR_PRE_ROUTING);
-+#endif
++ /* The stp code only considers these */
++ if (memcmp(&stph, header, sizeof(header)))
++ return EBT_NOMATCH;
+
-+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
-+ skb->pkt_type = PACKET_OTHERHOST;
-+ nf_bridge->mask ^= BRNF_PKT_TYPE;
-+ }
-+ nf_bridge->mask ^= BRNF_NF_BRIDGE_PREROUTING;
++ if (info->bitmask & EBT_STP_TYPE
++ && FWINV(info->type != stph.type, EBT_STP_TYPE))
++ return EBT_NOMATCH;
+
-+ if (dnat_took_place(skb)) {
-+ if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
-+ dev)) {
-+ struct rtable *rt;
++ if (stph.type == BPDU_TYPE_CONFIG &&
++ info->bitmask & EBT_STP_CONFIG_MASK) {
++ struct stp_config_pdu stpc;
+
-+ if (!ip_route_output(&rt, iph->daddr, 0, iph->tos, 0)) {
-+ /* Bridged-and-DNAT'ed traffic doesn't
-+ * require ip_forwarding.
-+ */
-+ if (((struct dst_entry *)rt)->dev == dev) {
-+ skb->dst = (struct dst_entry *)rt;
-+ goto bridged_dnat;
-+ }
-+ __br_dnat_complain();
-+ dst_release((struct dst_entry *)rt);
-+ }
-+ kfree_skb(skb);
-+ return 0;
-+ } else {
-+ if (skb->dst->dev == dev) {
-+bridged_dnat:
-+ /* Tell br_nf_local_out this is a
-+ * bridged frame
-+ */
-+ nf_bridge->mask |= BRNF_BRIDGED_DNAT;
-+ skb->dev = nf_bridge->physindev;
-+ if (skb->protocol ==
-+ __constant_htons(ETH_P_8021Q)) {
-+ skb_push(skb, VLAN_HLEN);
-+ skb->nh.raw -= VLAN_HLEN;
-+ }
-+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
-+ skb, skb->dev, NULL,
-+ br_nf_pre_routing_finish_bridge,
-+ 1);
-+ return 0;
-+ }
-+ memcpy(skb->mac.ethernet->h_dest, dev->dev_addr,
-+ ETH_ALEN);
-+ skb->pkt_type = PACKET_HOST;
-+ }
-+ } else {
-+ skb->dst = (struct dst_entry *)&__fake_rtable;
-+ dst_hold(skb->dst);
++ if (skb_copy_bits(skb, sizeof(stph), &stpc, sizeof(stpc)))
++ return EBT_NOMATCH;
++ return ebt_filter_config(info, &stpc);
+ }
++ return EBT_MATCH;
++}
+
-+ skb->dev = nf_bridge->physindev;
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_push(skb, VLAN_HLEN);
-+ skb->nh.raw -= VLAN_HLEN;
-+ }
-+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
-+ br_handle_frame_finish, 1);
++static int ebt_stp_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++ struct ebt_stp_info *info = (struct ebt_stp_info *)data;
++ int len = EBT_ALIGN(sizeof(struct ebt_stp_info));
++ uint8_t bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
++ uint8_t msk[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
++
++ if (info->bitmask & ~EBT_STP_MASK || info->invflags & ~EBT_STP_MASK ||
++ !(info->bitmask & EBT_STP_MASK))
++ return -EINVAL;
++ if (datalen != len)
++ return -EINVAL;
++ /* Make sure the match only receives stp frames */
++ if (memcmp(e->destmac, bridge_ula, ETH_ALEN) ||
++ memcmp(e->destmsk, msk, ETH_ALEN) || !(e->bitmask & EBT_DESTMAC))
++ return -EINVAL;
+
+ return 0;
+}
+
-+/* Replicate the checks that IPv4 does on packet reception.
-+ * Set skb->dev to the bridge device (i.e. parent of the
-+ * receiving device) to make netfilter happy, the REDIRECT
-+ * target in particular. Save the original destination IP
-+ * address to be able to detect DNAT afterwards.
-+ */
-+static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
++static struct ebt_match filter_stp =
+{
-+ struct iphdr *iph;
-+ __u32 len;
-+ struct sk_buff *skb = *pskb;
-+ struct nf_bridge_info *nf_bridge;
++ .name = EBT_STP_MATCH,
++ .match = ebt_filter_stp,
++ .check = ebt_stp_check,
++ .me = THIS_MODULE,
++};
+
-+#ifdef CONFIG_SYSCTL
-+ if (!brnf_call_iptables)
-+ return NF_ACCEPT;
-+#endif
++static int __init init(void)
++{
++ return ebt_register_match(&filter_stp);
++}
+
-+ if (skb->protocol != __constant_htons(ETH_P_IP)) {
-+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)
-+ ((*pskb)->mac.ethernet);
++static void __exit fini(void)
++{
++ ebt_unregister_match(&filter_stp);
++}
+
-+ if (!IS_VLAN_IP)
-+ return NF_ACCEPT;
-+ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
-+ goto out;
-+ skb_pull(*pskb, VLAN_HLEN);
-+ (*pskb)->nh.raw += VLAN_HLEN;
-+ } else if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
-+ goto out;
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_redirect.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,71 @@
++/*
++ * ebt_redirect
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * April, 2002
++ *
++ */
+
-+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
-+ goto inhdr_error;
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_redirect.h>
++#include <linux/module.h>
++#include <net/sock.h>
++#include "../br_private.h"
+
-+ iph = skb->nh.iph;
-+ if (iph->ihl < 5 || iph->version != 4)
-+ goto inhdr_error;
++static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
++ const struct net_device *in, const struct net_device *out,
++ const void *data, unsigned int datalen)
++{
++ struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
+
-+ if (!pskb_may_pull(skb, 4*iph->ihl))
-+ goto inhdr_error;
++ if (hooknr != NF_BR_BROUTING)
++ memcpy((**pskb).mac.ethernet->h_dest,
++ in->br_port->br->dev.dev_addr, ETH_ALEN);
++ else {
++ memcpy((**pskb).mac.ethernet->h_dest,
++ in->dev_addr, ETH_ALEN);
++ (*pskb)->pkt_type = PACKET_HOST;
++ }
++ return info->target;
++}
+
-+ iph = skb->nh.iph;
-+ if (ip_fast_csum((__u8 *)iph, iph->ihl) != 0)
-+ goto inhdr_error;
-+
-+ len = ntohs(iph->tot_len);
-+ if (skb->len < len || len < 4*iph->ihl)
-+ goto inhdr_error;
-+
-+ if (skb->len > len) {
-+ __pskb_trim(skb, len);
-+ if (skb->ip_summed == CHECKSUM_HW)
-+ skb->ip_summed = CHECKSUM_NONE;
-+ }
-+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug ^= (1 << NF_IP_PRE_ROUTING);
-+#endif
-+ if ((nf_bridge = nf_bridge_alloc(skb)) == NULL)
-+ return NF_DROP;
-+
-+ if (skb->pkt_type == PACKET_OTHERHOST) {
-+ skb->pkt_type = PACKET_HOST;
-+ nf_bridge->mask |= BRNF_PKT_TYPE;
-+ }
-+
-+ nf_bridge->mask |= BRNF_NF_BRIDGE_PREROUTING;
-+ nf_bridge->physindev = skb->dev;
-+ skb->dev = bridge_parent(skb->dev);
-+ store_orig_dstaddr(skb);
-+
-+ NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
-+ br_nf_pre_routing_finish);
-+
-+ return NF_STOLEN;
++static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
++{
++ struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
+
-+inhdr_error:
-+// IP_INC_STATS_BH(IpInHdrErrors);
-+out:
-+ return NF_DROP;
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info)))
++ return -EINVAL;
++ if (BASE_CHAIN && info->target == EBT_RETURN)
++ return -EINVAL;
++ CLEAR_BASE_CHAIN_BIT;
++ if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
++ (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
++ return -EINVAL;
++ if (INVALID_TARGET)
++ return -EINVAL;
++ return 0;
+}
+
-+
-+/* PF_BRIDGE/LOCAL_IN ************************************************/
-+/* The packet is locally destined, which requires a real
-+ * dst_entry, so detach the fake one. On the way up, the
-+ * packet would pass through PRE_ROUTING again (which already
-+ * took place when the packet entered the bridge), but we
-+ * register an IPv4 PRE_ROUTING 'sabotage' hook that will
-+ * prevent this from happening.
-+ */
-+static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
++static struct ebt_target redirect_target =
+{
-+ struct sk_buff *skb = *pskb;
-+
-+ if (skb->dst == (struct dst_entry *)&__fake_rtable) {
-+ dst_release(skb->dst);
-+ skb->dst = NULL;
-+ }
++ {NULL, NULL}, EBT_REDIRECT_TARGET, ebt_target_redirect,
++ ebt_target_redirect_check, NULL, THIS_MODULE
++};
+
-+ return NF_ACCEPT;
++static int __init init(void)
++{
++ return ebt_register_target(&redirect_target);
+}
+
-+/* PF_BRIDGE/FORWARD *************************************************/
-+static int br_nf_forward_finish(struct sk_buff *skb)
++static void __exit fini(void)
+{
-+ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
-+ struct net_device *in;
-+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
-+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
-+#endif
-+
-+ if (skb->protocol == __constant_htons(ETH_P_IP) || IS_VLAN_IP) {
-+ in = nf_bridge->physindev;
-+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
-+ skb->pkt_type = PACKET_OTHERHOST;
-+ nf_bridge->mask ^= BRNF_PKT_TYPE;
-+ }
-+ } else {
-+ in = *((struct net_device **)(skb->cb));
-+ }
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_push(skb, VLAN_HLEN);
-+ skb->nh.raw -= VLAN_HLEN;
-+ }
-+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, in,
-+ skb->dev, br_forward_finish, 1);
-+ return 0;
++ ebt_unregister_target(&redirect_target);
+}
+
-+/* This is the 'purely bridged' case. For IP, we pass the packet to
-+ * netfilter with indev and outdev set to the bridge device,
-+ * but we are still able to filter on the 'real' indev/outdev
-+ * because of the ipt_physdev.c module. For ARP, indev and outdev are the
-+ * bridge ports.
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_arp.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,149 @@
++/*
++ * ebt_arp
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ * Tim Gardner <timg@tpi.com>
++ *
++ * April, 2002
++ *
+ */
-+static unsigned int br_nf_forward_ip(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
-+{
-+ struct sk_buff *skb = *pskb;
-+ struct nf_bridge_info *nf_bridge;
-+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
+
-+#ifdef CONFIG_SYSCTL
-+ if (!skb->nf_bridge)
-+ return NF_ACCEPT;
-+#endif
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_arp.h>
++#include <linux/if_arp.h>
++#include <linux/if_ether.h>
++#include <linux/module.h>
+
-+ if (skb->protocol != __constant_htons(ETH_P_IP)) {
-+ if (!IS_VLAN_IP)
-+ return NF_ACCEPT;
-+ skb_pull(*pskb, VLAN_HLEN);
-+ (*pskb)->nh.raw += VLAN_HLEN;
-+ }
++static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *data, unsigned int datalen)
++{
++ struct ebt_arp_info *info = (struct ebt_arp_info *)data;
+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
-+#endif
-+ nf_bridge = skb->nf_bridge;
-+ if (skb->pkt_type == PACKET_OTHERHOST) {
-+ skb->pkt_type = PACKET_HOST;
-+ nf_bridge->mask |= BRNF_PKT_TYPE;
-+ }
++ if (info->bitmask & EBT_ARP_OPCODE && FWINV(info->opcode !=
++ ((*skb).nh.arph)->ar_op, EBT_ARP_OPCODE))
++ return EBT_NOMATCH;
++ if (info->bitmask & EBT_ARP_HTYPE && FWINV(info->htype !=
++ ((*skb).nh.arph)->ar_hrd, EBT_ARP_HTYPE))
++ return EBT_NOMATCH;
++ if (info->bitmask & EBT_ARP_PTYPE && FWINV(info->ptype !=
++ ((*skb).nh.arph)->ar_pro, EBT_ARP_PTYPE))
++ return EBT_NOMATCH;
+
-+ /* The physdev module checks on this */
-+ nf_bridge->mask |= BRNF_BRIDGED;
-+ nf_bridge->physoutdev = skb->dev;
++ if (info->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP))
++ {
++ uint32_t arp_len = sizeof(struct arphdr) +
++ (2 * (((*skb).nh.arph)->ar_hln)) +
++ (2 * (((*skb).nh.arph)->ar_pln));
++ uint32_t dst;
++ uint32_t src;
+
-+ NF_HOOK(PF_INET, NF_IP_FORWARD, skb, bridge_parent(in),
-+ bridge_parent(out), br_nf_forward_finish);
++ // Make sure the packet is long enough.
++ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
++ return EBT_NOMATCH;
++ // IPv4 addresses are always 4 bytes.
++ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
++ return EBT_NOMATCH;
+
-+ return NF_STOLEN;
-+}
++ if (info->bitmask & EBT_ARP_SRC_IP) {
++ memcpy(&src, ((*skb).nh.raw) + sizeof(struct arphdr) +
++ ((*skb).nh.arph)->ar_hln, sizeof(uint32_t));
++ if (FWINV(info->saddr != (src & info->smsk),
++ EBT_ARP_SRC_IP))
++ return EBT_NOMATCH;
++ }
+
-+/*
-+static unsigned int br_nf_forward_arp(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
-+{
-+ struct sk_buff *skb = *pskb;
-+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
-+ struct net_device **d = (struct net_device **)(skb->cb);
++ if (info->bitmask & EBT_ARP_DST_IP) {
++ memcpy(&dst, ((*skb).nh.raw)+sizeof(struct arphdr) +
++ (2*(((*skb).nh.arph)->ar_hln)) +
++ (((*skb).nh.arph)->ar_pln), sizeof(uint32_t));
++ if (FWINV(info->daddr != (dst & info->dmsk),
++ EBT_ARP_DST_IP))
++ return EBT_NOMATCH;
++ }
++ }
+
-+ if (!brnf_call_arptables)
-+ return NF_ACCEPT;
++ if (info->bitmask & (EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC))
++ {
++ uint32_t arp_len = sizeof(struct arphdr) +
++ (2 * (((*skb).nh.arph)->ar_hln)) +
++ (2 * (((*skb).nh.arph)->ar_pln));
++ unsigned char dst[ETH_ALEN];
++ unsigned char src[ETH_ALEN];
+
-+ if (skb->protocol != __constant_htons(ETH_P_ARP)) {
-+ if (!IS_VLAN_ARP)
-+ return NF_ACCEPT;
-+ skb_pull(*pskb, VLAN_HLEN);
-+ (*pskb)->nh.raw += VLAN_HLEN;
-+ }
++ // Make sure the packet is long enough.
++ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
++ return EBT_NOMATCH;
++ // MAC addresses are 6 bytes.
++ if (((*skb).nh.arph)->ar_hln != ETH_ALEN)
++ return EBT_NOMATCH;
++ if (info->bitmask & EBT_ARP_SRC_MAC) {
++ uint8_t verdict, i;
+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug ^= (1 << NF_BR_FORWARD);
-+#endif
++ memcpy(&src, ((*skb).nh.raw) +
++ sizeof(struct arphdr),
++ ETH_ALEN);
++ verdict = 0;
++ for (i = 0; i < 6; i++)
++ verdict |= (src[i] ^ info->smaddr[i]) &
++ info->smmsk[i];
++ if (FWINV(verdict != 0, EBT_ARP_SRC_MAC))
++ return EBT_NOMATCH;
++ }
+
-+ if (skb->nh.arph->ar_pln != 4) {
-+ if (IS_VLAN_ARP) {
-+ skb_push(*pskb, VLAN_HLEN);
-+ (*pskb)->nh.raw -= VLAN_HLEN;
++ if (info->bitmask & EBT_ARP_DST_MAC) {
++ uint8_t verdict, i;
++
++ memcpy(&dst, ((*skb).nh.raw) +
++ sizeof(struct arphdr) +
++ (((*skb).nh.arph)->ar_hln) +
++ (((*skb).nh.arph)->ar_pln),
++ ETH_ALEN);
++ verdict = 0;
++ for (i = 0; i < 6; i++)
++ verdict |= (dst[i] ^ info->dmaddr[i]) &
++ info->dmmsk[i];
++ if (FWINV(verdict != 0, EBT_ARP_DST_MAC))
++ return EBT_NOMATCH;
+ }
-+ return NF_ACCEPT;
+ }
-+ *d = (struct net_device *)in;
-+ NF_HOOK(NF_ARP, NF_ARP_FORWARD, skb, (struct net_device *)in,
-+ (struct net_device *)out, br_nf_forward_finish);
+
-+ return NF_STOLEN;
++ return EBT_MATCH;
+}
-+*/
+
-+/* PF_BRIDGE/LOCAL_OUT ***********************************************/
-+static int br_nf_local_out_finish(struct sk_buff *skb)
++static int ebt_arp_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug &= ~(1 << NF_BR_LOCAL_OUT);
-+#endif
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_push(skb, VLAN_HLEN);
-+ skb->nh.raw -= VLAN_HLEN;
-+ }
-+
-+ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
-+ br_forward_finish, NF_BR_PRI_FIRST + 1);
++ struct ebt_arp_info *info = (struct ebt_arp_info *)data;
+
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_arp_info)))
++ return -EINVAL;
++ if ((e->ethproto != __constant_htons(ETH_P_ARP) &&
++ e->ethproto != __constant_htons(ETH_P_RARP)) ||
++ e->invflags & EBT_IPROTO)
++ return -EINVAL;
++ if (info->bitmask & ~EBT_ARP_MASK || info->invflags & ~EBT_ARP_MASK)
++ return -EINVAL;
+ return 0;
+}
+
-+
-+/* This function sees both locally originated IP packets and forwarded
-+ * IP packets (in both cases the destination device is a bridge
-+ * device). It also sees bridged-and-DNAT'ed packets.
-+ * To be able to filter on the physical bridge devices (with the ipt_physdev.c
-+ * module), we steal packets destined to a bridge device away from the
-+ * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later,
-+ * when we have determined the real output device. This is done in here.
-+ *
-+ * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged
-+ * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward()
-+ * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority
-+ * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
-+ * will be executed.
-+ * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched
-+ * this packet before, and so the packet was locally originated. We fake
-+ * the PF_INET/LOCAL_OUT hook.
-+ * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed,
-+ * so we fake the PF_INET/FORWARD hook. ipv4_sabotage_out() makes sure
-+ * even routed packets that didn't arrive on a bridge interface have their
-+ * nf_bridge->physindev set.
-+ */
-+
-+static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*_okfn)(struct sk_buff *))
++static struct ebt_match filter_arp =
+{
-+ int (*okfn)(struct sk_buff *skb);
-+ struct net_device *realindev;
-+ struct sk_buff *skb = *pskb;
-+ struct nf_bridge_info *nf_bridge;
-+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
-+
-+#ifdef CONFIG_SYSCTL
-+ if (!skb->nf_bridge)
-+ return NF_ACCEPT;
-+#endif
++ {NULL, NULL}, EBT_ARP_MATCH, ebt_filter_arp, ebt_arp_check, NULL,
++ THIS_MODULE
++};
+
-+ if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP)
-+ return NF_ACCEPT;
++static int __init init(void)
++{
++ return ebt_register_match(&filter_arp);
++}
+
-+ /* Sometimes we get packets with NULL ->dst here (for example,
-+ * running a dhcp client daemon triggers this).
-+ */
-+ if (skb->dst == NULL)
-+ return NF_ACCEPT;
++static void __exit fini(void)
++{
++ ebt_unregister_match(&filter_arp);
++}
+
-+ nf_bridge = skb->nf_bridge;
-+ nf_bridge->physoutdev = skb->dev;
-+ realindev = nf_bridge->physindev;
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_ip.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,121 @@
++/*
++ * ebt_ip
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * April, 2002
++ *
++ * Changes:
++ * added ip-sport and ip-dport
++ * Innominate Security Technologies AG <mhopf@innominate.com>
++ * September, 2002
++ */
+
-+ /* Bridged, take PF_BRIDGE/FORWARD.
-+ * (see big note in front of br_nf_pre_routing_finish)
-+ */
-+ if (nf_bridge->mask & BRNF_BRIDGED_DNAT) {
-+ okfn = br_forward_finish;
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_ip.h>
++#include <linux/ip.h>
++#include <linux/in.h>
++#include <linux/module.h>
+
-+ if (nf_bridge->mask & BRNF_PKT_TYPE) {
-+ skb->pkt_type = PACKET_OTHERHOST;
-+ nf_bridge->mask ^= BRNF_PKT_TYPE;
-+ }
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_push(skb, VLAN_HLEN);
-+ skb->nh.raw -= VLAN_HLEN;
-+ }
++struct tcpudphdr {
++ uint16_t src;
++ uint16_t dst;
++};
+
-+ NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
-+ skb->dev, okfn);
-+ } else {
-+ struct net_device *realoutdev = bridge_parent(skb->dev);
++union h_u {
++ unsigned char *raw;
++ struct tcpudphdr *tuh;
++};
+
-+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-+ /* iptables should match -o br0.x */
-+ if (nf_bridge->netoutdev)
-+ realoutdev = nf_bridge->netoutdev;
-+#endif
-+ okfn = br_nf_local_out_finish;
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_pull(skb, VLAN_HLEN);
-+ (*pskb)->nh.raw += VLAN_HLEN;
-+ }
-+ /* IP forwarded traffic has a physindev, locally
-+ * generated traffic hasn't.
-+ */
-+ if (realindev != NULL) {
-+ if (((nf_bridge->mask & BRNF_DONT_TAKE_PARENT) == 0) &&
-+ has_bridge_parent(realindev))
-+ realindev = bridge_parent(realindev);
-+ NF_HOOK_THRESH(PF_INET, NF_IP_FORWARD, skb, realindev,
-+ realoutdev, okfn,
-+ NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1);
-+ } else {
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ skb->nf_debug ^= (1 << NF_IP_LOCAL_OUT);
-+#endif
++static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *data,
++ unsigned int datalen)
++{
++ struct ebt_ip_info *info = (struct ebt_ip_info *)data;
+
-+ NF_HOOK_THRESH(PF_INET, NF_IP_LOCAL_OUT, skb, realindev,
-+ realoutdev, okfn,
-+ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
++ if (info->bitmask & EBT_IP_TOS &&
++ FWINV(info->tos != ((*skb).nh.iph)->tos, EBT_IP_TOS))
++ return EBT_NOMATCH;
++ if (info->bitmask & EBT_IP_PROTO) {
++ if (FWINV(info->protocol != ((*skb).nh.iph)->protocol,
++ EBT_IP_PROTO))
++ return EBT_NOMATCH;
++ if ( info->protocol == IPPROTO_TCP ||
++ info->protocol == IPPROTO_UDP )
++ {
++ union h_u h;
++ h.raw = skb->data + skb->nh.iph->ihl*4;
++ if (info->bitmask & EBT_IP_DPORT) {
++ uint16_t port = ntohs(h.tuh->dst);
++ if (FWINV(port < info->dport[0] ||
++ port > info->dport[1],
++ EBT_IP_DPORT))
++ return EBT_NOMATCH;
++ }
++ if (info->bitmask & EBT_IP_SPORT) {
++ uint16_t port = ntohs(h.tuh->src);
++ if (FWINV(port < info->sport[0] ||
++ port > info->sport[1],
++ EBT_IP_SPORT))
++ return EBT_NOMATCH;
++ }
+ }
+ }
-+
-+ return NF_STOLEN;
++ if (info->bitmask & EBT_IP_SOURCE &&
++ FWINV((((*skb).nh.iph)->saddr & info->smsk) !=
++ info->saddr, EBT_IP_SOURCE))
++ return EBT_NOMATCH;
++ if ((info->bitmask & EBT_IP_DEST) &&
++ FWINV((((*skb).nh.iph)->daddr & info->dmsk) !=
++ info->daddr, EBT_IP_DEST))
++ return EBT_NOMATCH;
++ return EBT_MATCH;
+}
+
-+
-+/* PF_BRIDGE/POST_ROUTING ********************************************/
-+static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
++static int ebt_ip_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+ struct sk_buff *skb = *pskb;
-+ struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
-+ struct vlan_ethhdr *hdr = (struct vlan_ethhdr *)(skb->mac.ethernet);
-+ struct net_device *realoutdev = bridge_parent(skb->dev);
-+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ /* Be very paranoid. This probably won't happen anymore, but let's
-+ * keep the check just to be sure... */
-+ if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
-+ printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: "
-+ "bad mac.raw pointer.");
-+ goto print_error;
-+ }
-+#endif
-+
-+#ifdef CONFIG_SYSCTL
-+ if (!nf_bridge)
-+ return NF_ACCEPT;
-+#endif
-+
-+ if (skb->protocol != __constant_htons(ETH_P_IP) && !IS_VLAN_IP)
-+ return NF_ACCEPT;
-+
-+ /* Sometimes we get packets with NULL ->dst here (for example,
-+ * running a dhcp client daemon triggers this).
-+ */
-+ if (skb->dst == NULL)
-+ return NF_ACCEPT;
-+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ /* Sometimes we get packets with NULL ->dst here (for example,
-+ * running a dhcp client daemon triggers this). This should now
-+ * be fixed, but let's keep the check around.
-+ */
-+ if (skb->dst == NULL) {
-+ printk(KERN_CRIT "br_netfilter: skb->dst == NULL.");
-+ goto print_error;
-+ }
-+
-+ skb->nf_debug ^= (1 << NF_IP_POST_ROUTING);
-+#endif
-+
-+ /* We assume any code from br_dev_queue_push_xmit onwards doesn't care
-+ * about the value of skb->pkt_type.
-+ */
-+ if (skb->pkt_type == PACKET_OTHERHOST) {
-+ skb->pkt_type = PACKET_HOST;
-+ nf_bridge->mask |= BRNF_PKT_TYPE;
-+ }
-+
-+ if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
-+ skb_pull(skb, VLAN_HLEN);
-+ skb->nh.raw += VLAN_HLEN;
-+ }
-+
-+ nf_bridge_save_header(skb);
-+
-+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-+ if (nf_bridge->netoutdev)
-+ realoutdev = nf_bridge->netoutdev;
-+#endif
-+ NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL,
-+ realoutdev, br_dev_queue_push_xmit);
-+
-+ return NF_STOLEN;
++ struct ebt_ip_info *info = (struct ebt_ip_info *)data;
+
-+#ifdef CONFIG_NETFILTER_DEBUG
-+print_error:
-+ if (skb->dev != NULL) {
-+ printk("[%s]", skb->dev->name);
-+ if (has_bridge_parent(skb->dev))
-+ printk("[%s]", bridge_parent(skb->dev)->name);
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_ip_info)))
++ return -EINVAL;
++ if (e->ethproto != __constant_htons(ETH_P_IP) ||
++ e->invflags & EBT_IPROTO)
++ return -EINVAL;
++ if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
++ return -EINVAL;
++ if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
++ if (!info->bitmask & EBT_IPROTO)
++ return -EINVAL;
++ if (info->protocol != IPPROTO_TCP &&
++ info->protocol != IPPROTO_UDP)
++ return -EINVAL;
+ }
-+ printk(" head:%p, raw:%p, data:%p\n", skb->head, skb->mac.raw,
-+ skb->data);
-+ return NF_ACCEPT;
-+#endif
++ if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
++ return -EINVAL;
++ if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
++ return -EINVAL;
++ return 0;
+}
+
-+
-+/* IPv4/SABOTAGE *****************************************************/
-+
-+/* Don't hand locally destined packets to PF_INET/PRE_ROUTING
-+ * for the second time.
-+ */
-+static unsigned int ipv4_sabotage_in(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
++static struct ebt_match filter_ip =
+{
-+ if ((*pskb)->nf_bridge &&
-+ !((*pskb)->nf_bridge->mask & BRNF_NF_BRIDGE_PREROUTING)) {
-+ okfn(*pskb);
-+ return NF_STOLEN;
-+ }
++ {NULL, NULL}, EBT_IP_MATCH, ebt_filter_ip, ebt_ip_check, NULL,
++ THIS_MODULE
++};
+
-+ return NF_ACCEPT;
++static int __init init(void)
++{
++ return ebt_register_match(&filter_ip);
+}
+
-+/* Postpone execution of PF_INET/FORWARD, PF_INET/LOCAL_OUT
-+ * and PF_INET/POST_ROUTING until we have done the forwarding
-+ * decision in the bridge code and have determined skb->physoutdev.
-+ */
-+static unsigned int ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ int (*okfn)(struct sk_buff *))
++static void __exit fini(void)
+{
-+ struct sk_buff *skb = *pskb;
-+
-+#ifdef CONFIG_SYSCTL
-+ if (!brnf_call_iptables && !skb->nf_bridge)
-+ return NF_ACCEPT;
-+#endif
-+
-+ if ((out->hard_start_xmit == br_dev_xmit &&
-+ okfn != br_nf_forward_finish &&
-+ okfn != br_nf_local_out_finish &&
-+ okfn != br_dev_queue_push_xmit)
-+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-+ || ((out->priv_flags & IFF_802_1Q_VLAN) &&
-+ VLAN_DEV_INFO(out)->real_dev->hard_start_xmit == br_dev_xmit)
-+#endif
-+ ) {
-+ struct nf_bridge_info *nf_bridge;
-+
-+ if (!skb->nf_bridge && !nf_bridge_alloc(skb))
-+ return NF_DROP;
-+
-+ nf_bridge = skb->nf_bridge;
-+
-+ /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we
-+ * will need the indev then. For a brouter, the real indev
-+ * can be a bridge port, so we make sure br_nf_local_out()
-+ * doesn't use the bridge parent of the indev by using
-+ * the BRNF_DONT_TAKE_PARENT mask.
-+ */
-+ if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) {
-+ nf_bridge->mask &= BRNF_DONT_TAKE_PARENT;
-+ nf_bridge->physindev = (struct net_device *)in;
-+ }
-+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
-+ /* the iptables outdev is br0.x, not br0 */
-+ if (out->priv_flags & IFF_802_1Q_VLAN)
-+ nf_bridge->netoutdev = (struct net_device *)out;
-+#endif
-+ okfn(skb);
-+ return NF_STOLEN;
-+ }
-+
-+ return NF_ACCEPT;
++ ebt_unregister_match(&filter_ip);
+}
+
-+/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent
-+ * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
-+ * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
-+ * ip_refrag() can return NF_STOLEN.
++module_init(init);
++module_exit(fini);
++EXPORT_NO_SYMBOLS;
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_vlan.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,259 @@
++/*
++ * Description: EBTables 802.1Q match extension kernelspace module.
++ * Authors: Nick Fedchik <nick@fedchik.org.ua>
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ *
++ * You should have received a copy of the GNU General Public License
++ * along with this program; if not, write to the Free Software
++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
-+static struct nf_hook_ops br_nf_ops[] = {
-+ { .hook = br_nf_pre_routing,
-+ .pf = PF_BRIDGE,
-+ .hooknum = NF_BR_PRE_ROUTING,
-+ .priority = NF_BR_PRI_BRNF, },
-+ { .hook = br_nf_local_in,
-+ .pf = PF_BRIDGE,
-+ .hooknum = NF_BR_LOCAL_IN,
-+ .priority = NF_BR_PRI_BRNF, },
-+ { .hook = br_nf_forward_ip,
-+ .pf = PF_BRIDGE,
-+ .hooknum = NF_BR_FORWARD,
-+ .priority = NF_BR_PRI_BRNF /*- 1*/, },
-+/* { .hook = br_nf_forward_arp,
-+ .pf = PF_BRIDGE,
-+ .hooknum = NF_BR_FORWARD,
-+ .priority = NF_BR_PRI_BRNF, },*/
-+ { .hook = br_nf_local_out,
-+ .pf = PF_BRIDGE,
-+ .hooknum = NF_BR_LOCAL_OUT,
-+ .priority = NF_BR_PRI_FIRST, },
-+ { .hook = br_nf_post_routing,
-+ .pf = PF_BRIDGE,
-+ .hooknum = NF_BR_POST_ROUTING,
-+ .priority = NF_BR_PRI_LAST, },
-+ { .hook = ipv4_sabotage_in,
-+ .pf = PF_INET,
-+ .hooknum = NF_IP_PRE_ROUTING,
-+ .priority = NF_IP_PRI_FIRST, },
-+ { .hook = ipv4_sabotage_out,
-+ .pf = PF_INET,
-+ .hooknum = NF_IP_FORWARD,
-+ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, },
-+ { .hook = ipv4_sabotage_out,
-+ .pf = PF_INET,
-+ .hooknum = NF_IP_LOCAL_OUT,
-+ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
-+ { .hook = ipv4_sabotage_out,
-+ .pf = PF_INET,
-+ .hooknum = NF_IP_POST_ROUTING,
-+ .priority = NF_IP_PRI_FIRST, },
-+};
-+
-+#ifdef CONFIG_SYSCTL
-+static
-+int brnf_sysctl_call_tables(ctl_table *ctl, int write, struct file * filp,
-+ void *buffer, size_t *lenp)
-+{
-+ int ret;
+
-+ ret = proc_dointvec(ctl, write, filp, buffer, lenp);
++#include <linux/if_ether.h>
++#include <linux/if_vlan.h>
++#include <linux/module.h>
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/netfilter_bridge/ebt_vlan.h>
+
-+ if (write && *(int *)(ctl->data))
-+ *(int *)(ctl->data) = 1;
-+ return ret;
-+}
++static unsigned char debug;
++#define MODULE_VERSION "0.6"
+
-+static ctl_table brnf_table[] = {
-+ {
-+ .ctl_name = NET_BRIDGE_NF_CALL_ARPTABLES,
-+ .procname = "bridge-nf-call-arptables",
-+ .data = &brnf_call_arptables,
-+ .maxlen = sizeof(int),
-+ .mode = 0644,
-+ .proc_handler = &brnf_sysctl_call_tables,
-+ },
-+ {
-+ .ctl_name = NET_BRIDGE_NF_CALL_IPTABLES,
-+ .procname = "bridge-nf-call-iptables",
-+ .data = &brnf_call_iptables,
-+ .maxlen = sizeof(int),
-+ .mode = 0644,
-+ .proc_handler = &brnf_sysctl_call_tables,
-+ },
-+ {
-+ .ctl_name = NET_BRIDGE_NF_FILTER_VLAN_TAGGED,
-+ .procname = "bridge-nf-filter-vlan-tagged",
-+ .data = &brnf_filter_vlan_tagged,
-+ .maxlen = sizeof(int),
-+ .mode = 0644,
-+ .proc_handler = &brnf_sysctl_call_tables,
-+ },
-+ { .ctl_name = 0 }
-+};
++MODULE_PARM(debug, "0-1b");
++MODULE_PARM_DESC(debug, "debug=1 is turn on debug messages");
++MODULE_AUTHOR("Nick Fedchik <nick@fedchik.org.ua>");
++MODULE_DESCRIPTION("802.1Q match module (ebtables extension), v"
++ MODULE_VERSION);
++MODULE_LICENSE("GPL");
+
-+static ctl_table brnf_bridge_table[] = {
-+ {
-+ .ctl_name = NET_BRIDGE,
-+ .procname = "bridge",
-+ .mode = 0555,
-+ .child = brnf_table,
-+ },
-+ { .ctl_name = 0 }
-+};
+
-+static ctl_table brnf_net_table[] = {
-+ {
-+ .ctl_name = CTL_NET,
-+ .procname = "net",
-+ .mode = 0555,
-+ .child = brnf_bridge_table,
-+ },
-+ { .ctl_name = 0 }
-+};
-+#endif
++#define DEBUG_MSG(args...) if (debug) printk (KERN_DEBUG "ebt_vlan: " args)
++#define INV_FLAG(_inv_flag_) (info->invflags & _inv_flag_) ? "!" : ""
++#define GET_BITMASK(_BIT_MASK_) info->bitmask & _BIT_MASK_
++#define SET_BITMASK(_BIT_MASK_) info->bitmask |= _BIT_MASK_
++#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return 1;
+
-+int br_netfilter_init(void)
++/*
++ * Function description: ebt_filter_vlan() is main engine for
++ * checking passed 802.1Q frame according to
++ * the passed extension parameters (in the *data buffer)
++ * ebt_filter_vlan() is called after successfull check the rule params
++ * by ebt_check_vlan() function.
++ * Parameters:
++ * const struct sk_buff *skb - pointer to passed ethernet frame buffer
++ * const void *data - pointer to passed extension parameters
++ * unsigned int datalen - length of passed *data buffer
++ * const struct net_device *in -
++ * const struct net_device *out -
++ * const struct ebt_counter *c -
++ * Returned values:
++ * 0 - ok (all rule params matched)
++ * 1 - miss (rule params not acceptable to the parsed frame)
++ */
++static int
++ebt_filter_vlan(const struct sk_buff *skb,
++ const struct net_device *in,
++ const struct net_device *out,
++ const void *data, unsigned int datalen)
+{
-+ int i;
-+
-+ for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) {
-+ int ret;
++ struct ebt_vlan_info *info = (struct ebt_vlan_info *) data; /* userspace data */
++ struct vlan_ethhdr *frame = (struct vlan_ethhdr *) skb->mac.raw; /* Passed tagged frame */
+
-+ if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0)
-+ continue;
++ unsigned short TCI; /* Whole TCI, given from parsed frame */
++ unsigned short id; /* VLAN ID, given from frame TCI */
++ unsigned char prio; /* user_priority, given from frame TCI */
++ unsigned short encap; /* VLAN encapsulated Type/Length field, given from orig frame */
+
-+ while (i--)
-+ nf_unregister_hook(&br_nf_ops[i]);
++ /*
++ * Tag Control Information (TCI) consists of the following elements:
++ * - User_priority. The user_priority field is three bits in length,
++ * interpreted as a binary number.
++ * - Canonical Format Indicator (CFI). The Canonical Format Indicator
++ * (CFI) is a single bit flag value. Currently ignored.
++ * - VLAN Identifier (VID). The VID is encoded as
++ * an unsigned binary number.
++ */
++ TCI = ntohs(frame->h_vlan_TCI);
++ id = TCI & VLAN_VID_MASK;
++ prio = (TCI >> 13) & 0x7;
++ encap = frame->h_vlan_encapsulated_proto;
+
-+ return ret;
++ /*
++ * Checking VLAN Identifier (VID)
++ */
++ if (GET_BITMASK(EBT_VLAN_ID)) { /* Is VLAN ID parsed? */
++ EXIT_ON_MISMATCH(id, EBT_VLAN_ID);
+ }
-+
-+#ifdef CONFIG_SYSCTL
-+ brnf_sysctl_header = register_sysctl_table(brnf_net_table, 0);
-+ if (brnf_sysctl_header == NULL) {
-+ printk(KERN_WARNING "br_netfilter: can't register to sysctl.\n");
-+ for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++)
-+ nf_unregister_hook(&br_nf_ops[i]);
-+ return -EFAULT;
++ /*
++ * Checking user_priority
++ */
++ if (GET_BITMASK(EBT_VLAN_PRIO)) { /* Is VLAN user_priority parsed? */
++ EXIT_ON_MISMATCH(prio, EBT_VLAN_PRIO);
+ }
-+#endif
-+
-+ printk(KERN_NOTICE "Bridge firewalling registered\n");
-+
++ /*
++ * Checking Encapsulated Proto (Length/Type) field
++ */
++ if (GET_BITMASK(EBT_VLAN_ENCAP)) { /* Is VLAN Encap parsed? */
++ EXIT_ON_MISMATCH(encap, EBT_VLAN_ENCAP);
++ }
++ /*
++ * All possible extension parameters was parsed.
++ * If rule never returned by missmatch, then all ok.
++ */
+ return 0;
+}
+
-+void br_netfilter_fini(void)
++/*
++ * Function description: ebt_vlan_check() is called when userspace
++ * delivers the table entry to the kernel,
++ * and to check that userspace doesn't give a bad table.
++ * Parameters:
++ * const char *tablename - table name string
++ * unsigned int hooknr - hook number
++ * const struct ebt_entry *e - ebtables entry basic set
++ * const void *data - pointer to passed extension parameters
++ * unsigned int datalen - length of passed *data buffer
++ * Returned values:
++ * 0 - ok (all delivered rule params are correct)
++ * 1 - miss (rule params is out of range, invalid, incompatible, etc.)
++ */
++static int
++ebt_check_vlan(const char *tablename,
++ unsigned int hooknr,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+ int i;
++ struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;
+
-+ for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--)
-+ nf_unregister_hook(&br_nf_ops[i]);
-+#ifdef CONFIG_SYSCTL
-+ unregister_sysctl_table(brnf_sysctl_header);
-+#endif
++ /*
++ * Parameters buffer overflow check
++ */
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_vlan_info))) {
++ DEBUG_MSG
++ ("passed size %d is not eq to ebt_vlan_info (%d)\n",
++ datalen, sizeof(struct ebt_vlan_info));
++ return -EINVAL;
++ }
+
-+}
-diff -Nurb linux.stock/net/bridge/br_private.h linux/net/bridge/br_private.h
---- linux.stock/net/bridge/br_private.h 2003-10-14 04:09:32.000000000 -0400
-+++ linux/net/bridge/br_private.h 2004-07-10 23:46:39.000000000 -0400
-@@ -145,8 +145,10 @@
- /* br_forward.c */
- extern void br_deliver(struct net_bridge_port *to,
- struct sk_buff *skb);
-+extern int br_dev_queue_push_xmit(struct sk_buff *skb);
- extern void br_forward(struct net_bridge_port *to,
- struct sk_buff *skb);
-+extern int br_forward_finish(struct sk_buff *skb);
- extern void br_flood_deliver(struct net_bridge *br,
- struct sk_buff *skb,
- int clone);
-@@ -167,7 +169,8 @@
- int *ifindices);
-
- /* br_input.c */
--extern void br_handle_frame(struct sk_buff *skb);
-+extern int br_handle_frame_finish(struct sk_buff *skb);
-+extern int br_handle_frame(struct sk_buff *skb);
-
- /* br_ioctl.c */
- extern void br_call_ioctl_atomic(void (*fn)(void));
-@@ -178,6 +181,10 @@
- unsigned long arg2);
- extern int br_ioctl_deviceless_stub(unsigned long arg);
-
-+/* br_netfilter.c */
-+extern int br_netfilter_init(void);
-+extern void br_netfilter_fini(void);
-+
- /* br_stp.c */
- extern int br_is_root_bridge(struct net_bridge *br);
- extern struct net_bridge_port *br_get_port(struct net_bridge *br,
-diff -Nurb linux.stock/net/bridge/netfilter/Config.in linux/net/bridge/netfilter/Config.in
---- linux.stock/net/bridge/netfilter/Config.in 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/Config.in 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,22 @@
-+#
-+# Bridge netfilter configuration
-+#
-+dep_tristate ' Bridge: ebtables' CONFIG_BRIDGE_NF_EBTABLES $CONFIG_BRIDGE
-+dep_tristate ' ebt: filter table support' CONFIG_BRIDGE_EBT_T_FILTER $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: nat table support' CONFIG_BRIDGE_EBT_T_NAT $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: broute table support' CONFIG_BRIDGE_EBT_BROUTE $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: log support' CONFIG_BRIDGE_EBT_LOG $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: IP filter support' CONFIG_BRIDGE_EBT_IPF $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: ARP filter support' CONFIG_BRIDGE_EBT_ARPF $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: among filter support' CONFIG_BRIDGE_EBT_AMONG $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: limit filter support' CONFIG_BRIDGE_EBT_LIMIT $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: 802.1Q VLAN filter support' CONFIG_BRIDGE_EBT_VLANF $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: 802.3 filter support' CONFIG_BRIDGE_EBT_802_3 $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: packet type filter support' CONFIG_BRIDGE_EBT_PKTTYPE $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: STP filter support' CONFIG_BRIDGE_EBT_STP $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: mark filter support' CONFIG_BRIDGE_EBT_MARKF $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: arp reply target support' CONFIG_BRIDGE_EBT_ARPREPLY $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: snat target support' CONFIG_BRIDGE_EBT_SNAT $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: dnat target support' CONFIG_BRIDGE_EBT_DNAT $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: redirect target support' CONFIG_BRIDGE_EBT_REDIRECT $CONFIG_BRIDGE_NF_EBTABLES
-+dep_tristate ' ebt: mark target support' CONFIG_BRIDGE_EBT_MARK_T $CONFIG_BRIDGE_NF_EBTABLES
-diff -Nurb linux.stock/net/bridge/netfilter/Makefile linux/net/bridge/netfilter/Makefile
---- linux.stock/net/bridge/netfilter/Makefile 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/Makefile 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,33 @@
-+#
-+# Makefile for the netfilter modules on top of bridging.
-+#
-+# Note! Dependencies are done automagically by 'make dep', which also
-+# removes any old dependencies. DON'T put your own dependencies here
-+# unless it's something special (ie not a .c file).
-+#
-+# Note 2! The CFLAGS definition is now in the main makefile...
-+
-+O_TARGET := netfilter.o
-+
-+export-objs := ebtables.o
-+
-+obj-$(CONFIG_BRIDGE_NF_EBTABLES) += ebtables.o
-+obj-$(CONFIG_BRIDGE_EBT_T_FILTER) += ebtable_filter.o
-+obj-$(CONFIG_BRIDGE_EBT_T_NAT) += ebtable_nat.o
-+obj-$(CONFIG_BRIDGE_EBT_BROUTE) += ebtable_broute.o
-+obj-$(CONFIG_BRIDGE_EBT_802_3) += ebt_802_3.o
-+obj-$(CONFIG_BRIDGE_EBT_ARPF) += ebt_arp.o
-+obj-$(CONFIG_BRIDGE_EBT_AMONG) += ebt_among.o
-+obj-$(CONFIG_BRIDGE_EBT_IPF) += ebt_ip.o
-+obj-$(CONFIG_BRIDGE_EBT_LIMIT) += ebt_limit.o
-+obj-$(CONFIG_BRIDGE_EBT_MARKF) += ebt_mark_m.o
-+obj-$(CONFIG_BRIDGE_EBT_PKTTYPE) += ebt_pkttype.o
-+obj-$(CONFIG_BRIDGE_EBT_STP) += ebt_stp.o
-+obj-$(CONFIG_BRIDGE_EBT_VLANF) += ebt_vlan.o
-+obj-$(CONFIG_BRIDGE_EBT_LOG) += ebt_log.o
-+obj-$(CONFIG_BRIDGE_EBT_ARPREPLY) += ebt_arpreply.o
-+obj-$(CONFIG_BRIDGE_EBT_DNAT) += ebt_dnat.o
-+obj-$(CONFIG_BRIDGE_EBT_MARK_T) += ebt_mark.o
-+obj-$(CONFIG_BRIDGE_EBT_REDIRECT) += ebt_redirect.o
-+obj-$(CONFIG_BRIDGE_EBT_SNAT) += ebt_snat.o
-+include $(TOPDIR)/Rules.make
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_802_3.c linux/net/bridge/netfilter/ebt_802_3.c
---- linux.stock/net/bridge/netfilter/ebt_802_3.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_802_3.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,74 @@
-+/*
-+ * 802_3
-+ *
-+ * Author:
-+ * Chris Vitale csv@bluetail.com
-+ *
-+ * May 2003
-+ *
-+ */
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_802_3.h>
-+#include <linux/module.h>
-+
-+static int ebt_filter_802_3(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *data, unsigned int datalen)
-+{
-+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
-+ struct ebt_802_3_hdr *hdr = (struct ebt_802_3_hdr *)skb->mac.ethernet;
-+ uint16_t type = hdr->llc.ui.ctrl & IS_UI ? hdr->llc.ui.type : hdr->llc.ni.type;
-+
-+ if (info->bitmask & EBT_802_3_SAP) {
-+ if (FWINV(info->sap != hdr->llc.ui.ssap, EBT_802_3_SAP))
-+ return EBT_NOMATCH;
-+ if (FWINV(info->sap != hdr->llc.ui.dsap, EBT_802_3_SAP))
-+ return EBT_NOMATCH;
++ /*
++ * Is it 802.1Q frame checked?
++ */
++ if (e->ethproto != __constant_htons(ETH_P_8021Q)) {
++ DEBUG_MSG
++ ("passed entry proto %2.4X is not 802.1Q (8100)\n",
++ (unsigned short) ntohs(e->ethproto));
++ return -EINVAL;
+ }
+
-+ if (info->bitmask & EBT_802_3_TYPE) {
-+ if (!(hdr->llc.ui.dsap == CHECK_TYPE && hdr->llc.ui.ssap == CHECK_TYPE))
-+ return EBT_NOMATCH;
-+ if (FWINV(info->type != type, EBT_802_3_TYPE))
-+ return EBT_NOMATCH;
++ /*
++ * Check for bitmask range
++ * True if even one bit is out of mask
++ */
++ if (info->bitmask & ~EBT_VLAN_MASK) {
++ DEBUG_MSG("bitmask %2X is out of mask (%2X)\n",
++ info->bitmask, EBT_VLAN_MASK);
++ return -EINVAL;
+ }
+
-+ return EBT_MATCH;
-+}
++ /*
++ * Check for inversion flags range
++ */
++ if (info->invflags & ~EBT_VLAN_MASK) {
++ DEBUG_MSG("inversion flags %2X is out of mask (%2X)\n",
++ info->invflags, EBT_VLAN_MASK);
++ return -EINVAL;
++ }
+
-+static struct ebt_match filter_802_3;
-+static int ebt_802_3_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
-+{
-+ struct ebt_802_3_info *info = (struct ebt_802_3_info *)data;
++ /*
++ * Reserved VLAN ID (VID) values
++ * -----------------------------
++ * 0 - The null VLAN ID.
++ * 1 - The default Port VID (PVID)
++ * 0x0FFF - Reserved for implementation use.
++ * if_vlan.h: VLAN_GROUP_ARRAY_LEN 4096.
++ */
++ if (GET_BITMASK(EBT_VLAN_ID)) { /* when vlan-id param was spec-ed */
++ if (!!info->id) { /* if id!=0 => check vid range */
++ if (info->id > VLAN_GROUP_ARRAY_LEN) {
++ DEBUG_MSG
++ ("id %d is out of range (1-4096)\n",
++ info->id);
++ return -EINVAL;
++ }
++ /*
++ * Note: This is valid VLAN-tagged frame point.
++ * Any value of user_priority are acceptable,
++ * but should be ignored according to 802.1Q Std.
++ * So we just drop the prio flag.
++ */
++ info->bitmask &= ~EBT_VLAN_PRIO;
++ }
++ /*
++ * Else, id=0 (null VLAN ID) => user_priority range (any?)
++ */
++ }
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_802_3_info)))
-+ return -EINVAL;
-+ if (info->bitmask & ~EBT_802_3_MASK || info->invflags & ~EBT_802_3_MASK)
-+ return -EINVAL;
++ if (GET_BITMASK(EBT_VLAN_PRIO)) {
++ if ((unsigned char) info->prio > 7) {
++ DEBUG_MSG
++ ("prio %d is out of range (0-7)\n",
++ info->prio);
++ return -EINVAL;
++ }
++ }
++ /*
++ * Check for encapsulated proto range - it is possible to be
++ * any value for u_short range.
++ * if_ether.h: ETH_ZLEN 60 - Min. octets in frame sans FCS
++ */
++ if (GET_BITMASK(EBT_VLAN_ENCAP)) {
++ if ((unsigned short) ntohs(info->encap) < ETH_ZLEN) {
++ DEBUG_MSG
++ ("encap frame length %d is less than minimal\n",
++ ntohs(info->encap));
++ return -EINVAL;
++ }
++ }
+
+ return 0;
+}
+
-+static struct ebt_match filter_802_3 =
-+{
-+ .name = EBT_802_3_MATCH,
-+ .match = ebt_filter_802_3,
-+ .check = ebt_802_3_check,
-+ .me = THIS_MODULE,
++static struct ebt_match filter_vlan = {
++ {NULL, NULL},
++ EBT_VLAN_MATCH,
++ ebt_filter_vlan,
++ ebt_check_vlan,
++ NULL,
++ THIS_MODULE
+};
+
++/*
++ * Module initialization function.
++ */
+static int __init init(void)
+{
-+ return ebt_register_match(&filter_802_3);
++ DEBUG_MSG("ebtables 802.1Q extension module v"
++ MODULE_VERSION "\n");
++ DEBUG_MSG("module debug=%d\n", !!debug);
++ return ebt_register_match(&filter_vlan);
+}
+
++/*
++ * Module "finalization" function
++ */
+static void __exit fini(void)
+{
-+ ebt_unregister_match(&filter_802_3);
++ ebt_unregister_match(&filter_vlan);
+}
+
+module_init(init);
+module_exit(fini);
++
+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_among.c linux/net/bridge/netfilter/ebt_among.c
---- linux.stock/net/bridge/netfilter/ebt_among.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_among.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,223 @@
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_log.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,152 @@
+/*
-+ * ebt_among
++ * ebt_log
+ *
+ * Authors:
-+ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
-+ * August, 2003
++ * April, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_among.h>
++#include <linux/netfilter_bridge/ebt_log.h>
++#include <linux/module.h>
+#include <linux/ip.h>
++#include <linux/in.h>
+#include <linux/if_arp.h>
-+#include <linux/module.h>
++#include <linux/spinlock.h>
+
-+static int ebt_mac_wormhash_contains(const struct ebt_mac_wormhash *wh,
-+ const char *mac, uint32_t ip)
++static spinlock_t ebt_log_lock = SPIN_LOCK_UNLOCKED;
++
++static int ebt_log_check(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+ /* You may be puzzled as to how this code works.
-+ * Some tricks were used, refer to
-+ * include/linux/netfilter_bridge/ebt_among.h
-+ * as there you can find a solution of this mystery.
-+ */
-+ const struct ebt_mac_wormhash_tuple *p;
-+ int start, limit, i;
-+ uint32_t cmp[2] = { 0, 0 };
-+ int key = (const unsigned char) mac[5];
-+
-+ memcpy(((char *) cmp) + 2, mac, 6);
-+ start = wh->table[key];
-+ limit = wh->table[key + 1];
-+ if (ip) {
-+ for (i = start; i < limit; i++) {
-+ p = &wh->pool[i];
-+ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
-+ if (p->ip == 0 || p->ip == ip) {
-+ return 1;
-+ }
-+ }
-+ }
-+ } else {
-+ for (i = start; i < limit; i++) {
-+ p = &wh->pool[i];
-+ if (cmp[1] == p->cmp[1] && cmp[0] == p->cmp[0]) {
-+ if (p->ip == 0) {
-+ return 1;
-+ }
-+ }
-+ }
-+ }
++ struct ebt_log_info *info = (struct ebt_log_info *)data;
++
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info)))
++ return -EINVAL;
++ if (info->bitmask & ~EBT_LOG_MASK)
++ return -EINVAL;
++ if (info->loglevel >= 8)
++ return -EINVAL;
++ info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
+ return 0;
+}
+
-+static int ebt_mac_wormhash_check_integrity(const struct ebt_mac_wormhash
-+ *wh)
++struct tcpudphdr
+{
-+ int i;
++ uint16_t src;
++ uint16_t dst;
++};
+
-+ for (i = 0; i < 256; i++) {
-+ if (wh->table[i] > wh->table[i + 1])
-+ return -0x100 - i;
-+ if (wh->table[i] < 0)
-+ return -0x200 - i;
-+ if (wh->table[i] > wh->poolsize)
-+ return -0x300 - i;
-+ }
-+ if (wh->table[256] > wh->poolsize)
-+ return -0xc00;
-+ return 0;
-+}
++struct arppayload
++{
++ unsigned char mac_src[ETH_ALEN];
++ unsigned char ip_src[4];
++ unsigned char mac_dst[ETH_ALEN];
++ unsigned char ip_dst[4];
++};
+
-+static int get_ip_dst(const struct sk_buff *skb, uint32_t * addr)
++static void print_MAC(unsigned char *p)
+{
-+ if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_IP))
-+ *addr = skb->nh.iph->daddr;
-+ else if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) {
-+ uint32_t arp_len = sizeof(struct arphdr) +
-+ (2 * (((*skb).nh.arph)->ar_hln)) +
-+ (2 * (((*skb).nh.arph)->ar_pln));
++ int i;
+
-+ /* Make sure the packet is long enough. */
-+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
-+ return -1;
-+ /* IPv4 addresses are always 4 bytes. */
-+ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
-+ return -1;
-+
-+ memcpy(addr, ((*skb).nh.raw) + sizeof(struct arphdr) +
-+ (2 * (((*skb).nh.arph)->ar_hln)) +
-+ (((*skb).nh.arph)->ar_pln), sizeof(uint32_t));
-+
-+ }
-+ return 0;
++ for (i = 0; i < ETH_ALEN; i++, p++)
++ printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':');
+}
+
-+static int get_ip_src(const struct sk_buff *skb, uint32_t * addr)
++#define myNIPQUAD(a) a[0], a[1], a[2], a[3]
++static void ebt_log(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *data, unsigned int datalen)
+{
-+ if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_IP))
-+ *addr = skb->nh.iph->saddr;
-+ else if (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) {
-+ uint32_t arp_len = sizeof(struct arphdr) +
-+ (2 * (((*skb).nh.arph)->ar_hln)) +
-+ (2 * (((*skb).nh.arph)->ar_pln));
-+
-+ /* Make sure the packet is long enough. */
-+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
-+ return -1;
-+ /* IPv4 addresses are always 4 bytes. */
-+ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
-+ return -1;
++ struct ebt_log_info *info = (struct ebt_log_info *)data;
++ char level_string[4] = "< >";
++ level_string[1] = '0' + info->loglevel;
+
-+ memcpy(addr, ((*skb).nh.raw) + sizeof(struct arphdr) +
-+ ((((*skb).nh.arph)->ar_hln)), sizeof(uint32_t));
++ spin_lock_bh(&ebt_log_lock);
++ printk(level_string);
++ printk("%s IN=%s OUT=%s ", info->prefix, in ? in->name : "",
++ out ? out->name : "");
+
-+ }
-+ return 0;
-+}
++ printk("MAC source = ");
++ print_MAC((skb->mac.ethernet)->h_source);
++ printk("MAC dest = ");
++ print_MAC((skb->mac.ethernet)->h_dest);
+
-+static int ebt_filter_among(const struct sk_buff *skb,
-+ const struct net_device *in,
-+ const struct net_device *out, const void *data,
-+ unsigned int datalen)
-+{
-+ struct ebt_among_info *info = (struct ebt_among_info *) data;
-+ const char *dmac, *smac;
-+ const struct ebt_mac_wormhash *wh_dst, *wh_src;
-+ uint32_t dip = 0, sip = 0;
++ printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto));
+
-+ wh_dst = ebt_among_wh_dst(info);
-+ wh_src = ebt_among_wh_src(info);
++ if ((info->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto ==
++ htons(ETH_P_IP)){
++ struct iphdr *iph = skb->nh.iph;
++ printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,",
++ NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
++ printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol);
++ if (iph->protocol == IPPROTO_TCP ||
++ iph->protocol == IPPROTO_UDP) {
++ struct tcpudphdr *ports = (struct tcpudphdr *)(skb->data + iph->ihl*4);
+
-+ if (wh_src) {
-+ smac = skb->mac.ethernet->h_source;
-+ if (get_ip_src(skb, &sip))
-+ return EBT_NOMATCH;
-+ if (!(info->bitmask & EBT_AMONG_SRC_NEG)) {
-+ /* we match only if it contains */
-+ if (!ebt_mac_wormhash_contains(wh_src, smac, sip))
-+ return EBT_NOMATCH;
-+ } else {
-+ /* we match only if it DOES NOT contain */
-+ if (ebt_mac_wormhash_contains(wh_src, smac, sip))
-+ return EBT_NOMATCH;
++ if (skb->data + iph->ihl*4 > skb->tail) {
++ printk(" INCOMPLETE TCP/UDP header");
++ goto out;
++ }
++ printk(" SPT=%u DPT=%u", ntohs(ports->src),
++ ntohs(ports->dst));
+ }
++ goto out;
+ }
+
-+ if (wh_dst) {
-+ dmac = skb->mac.ethernet->h_dest;
-+ if (get_ip_dst(skb, &dip))
-+ return EBT_NOMATCH;
-+ if (!(info->bitmask & EBT_AMONG_DST_NEG)) {
-+ /* we match only if it contains */
-+ if (!ebt_mac_wormhash_contains(wh_dst, dmac, dip))
-+ return EBT_NOMATCH;
-+ } else {
-+ /* we match only if it DOES NOT contain */
-+ if (ebt_mac_wormhash_contains(wh_dst, dmac, dip))
-+ return EBT_NOMATCH;
-+ }
-+ }
++ if ((info->bitmask & EBT_LOG_ARP) &&
++ ((skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) ||
++ (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_RARP)))) {
++ struct arphdr * arph = skb->nh.arph;
++ printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
++ ntohs(arph->ar_hrd), ntohs(arph->ar_pro),
++ ntohs(arph->ar_op));
++ /* If it's for Ethernet and the lengths are OK,
++ * then log the ARP payload */
++ if (arph->ar_hrd == __constant_htons(1) &&
++ arph->ar_hln == ETH_ALEN &&
++ arph->ar_pln == sizeof(uint32_t)) {
++ struct arppayload *arpp = (struct arppayload *)(skb->data + sizeof(*arph));
+
-+ return EBT_MATCH;
-+}
++ if (skb->data + sizeof(*arph) > skb->tail) {
++ printk(" INCOMPLETE ARP header");
++ goto out;
++ }
++
++ printk(" ARP MAC SRC=");
++ print_MAC(arpp->mac_src);
++ printk(" ARP IP SRC=%u.%u.%u.%u",
++ myNIPQUAD(arpp->ip_src));
++ printk(" ARP MAC DST=");
++ print_MAC(arpp->mac_dst);
++ printk(" ARP IP DST=%u.%u.%u.%u",
++ myNIPQUAD(arpp->ip_dst));
++ }
+
-+static int ebt_among_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data,
-+ unsigned int datalen)
-+{
-+ struct ebt_among_info *info = (struct ebt_among_info *) data;
-+ int expected_length = sizeof(struct ebt_among_info);
-+ const struct ebt_mac_wormhash *wh_dst, *wh_src;
-+ int err;
-+
-+ wh_dst = ebt_among_wh_dst(info);
-+ wh_src = ebt_among_wh_src(info);
-+ expected_length += ebt_mac_wormhash_size(wh_dst);
-+ expected_length += ebt_mac_wormhash_size(wh_src);
-+
-+ if (datalen != EBT_ALIGN(expected_length)) {
-+ printk(KERN_WARNING
-+ "ebtables: among: wrong size: %d"
-+ "against expected %d, rounded to %d\n",
-+ datalen, expected_length,
-+ EBT_ALIGN(expected_length));
-+ return -EINVAL;
-+ }
-+ if (wh_dst && (err = ebt_mac_wormhash_check_integrity(wh_dst))) {
-+ printk(KERN_WARNING
-+ "ebtables: among: dst integrity fail: %x\n", -err);
-+ return -EINVAL;
-+ }
-+ if (wh_src && (err = ebt_mac_wormhash_check_integrity(wh_src))) {
-+ printk(KERN_WARNING
-+ "ebtables: among: src integrity fail: %x\n", -err);
-+ return -EINVAL;
+ }
-+ return 0;
++out:
++ printk("\n");
++ spin_unlock_bh(&ebt_log_lock);
+}
+
-+static struct ebt_match filter_among = {
-+ {NULL, NULL},
-+ EBT_AMONG_MATCH,
-+ ebt_filter_among,
-+ ebt_among_check,
-+ NULL,
++static struct ebt_watcher log =
++{
++ {NULL, NULL}, EBT_LOG_WATCHER, ebt_log, ebt_log_check, NULL,
+ THIS_MODULE
+};
+
+static int __init init(void)
+{
-+ return ebt_register_match(&filter_among);
++ return ebt_register_watcher(&log);
+}
+
+static void __exit fini(void)
+{
-+ ebt_unregister_match(&filter_among);
++ ebt_unregister_watcher(&log);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_arp.c linux/net/bridge/netfilter/ebt_arp.c
---- linux.stock/net/bridge/netfilter/ebt_arp.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_arp.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,149 @@
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_snat.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,64 @@
+/*
-+ * ebt_arp
++ * ebt_snat
+ *
+ * Authors:
+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ * Tim Gardner <timg@tpi.com>
+ *
-+ * April, 2002
++ * June, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_arp.h>
-+#include <linux/if_arp.h>
-+#include <linux/if_ether.h>
++#include <linux/netfilter_bridge/ebt_nat.h>
+#include <linux/module.h>
+
-+static int ebt_filter_arp(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *data, unsigned int datalen)
++static int ebt_target_snat(struct sk_buff **pskb, unsigned int hooknr,
++ const struct net_device *in, const struct net_device *out,
++ const void *data, unsigned int datalen)
+{
-+ struct ebt_arp_info *info = (struct ebt_arp_info *)data;
-+
-+ if (info->bitmask & EBT_ARP_OPCODE && FWINV(info->opcode !=
-+ ((*skb).nh.arph)->ar_op, EBT_ARP_OPCODE))
-+ return EBT_NOMATCH;
-+ if (info->bitmask & EBT_ARP_HTYPE && FWINV(info->htype !=
-+ ((*skb).nh.arph)->ar_hrd, EBT_ARP_HTYPE))
-+ return EBT_NOMATCH;
-+ if (info->bitmask & EBT_ARP_PTYPE && FWINV(info->ptype !=
-+ ((*skb).nh.arph)->ar_pro, EBT_ARP_PTYPE))
-+ return EBT_NOMATCH;
-+
-+ if (info->bitmask & (EBT_ARP_SRC_IP | EBT_ARP_DST_IP))
-+ {
-+ uint32_t arp_len = sizeof(struct arphdr) +
-+ (2 * (((*skb).nh.arph)->ar_hln)) +
-+ (2 * (((*skb).nh.arph)->ar_pln));
-+ uint32_t dst;
-+ uint32_t src;
-+
-+ // Make sure the packet is long enough.
-+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
-+ return EBT_NOMATCH;
-+ // IPv4 addresses are always 4 bytes.
-+ if (((*skb).nh.arph)->ar_pln != sizeof(uint32_t))
-+ return EBT_NOMATCH;
-+
-+ if (info->bitmask & EBT_ARP_SRC_IP) {
-+ memcpy(&src, ((*skb).nh.raw) + sizeof(struct arphdr) +
-+ ((*skb).nh.arph)->ar_hln, sizeof(uint32_t));
-+ if (FWINV(info->saddr != (src & info->smsk),
-+ EBT_ARP_SRC_IP))
-+ return EBT_NOMATCH;
-+ }
-+
-+ if (info->bitmask & EBT_ARP_DST_IP) {
-+ memcpy(&dst, ((*skb).nh.raw)+sizeof(struct arphdr) +
-+ (2*(((*skb).nh.arph)->ar_hln)) +
-+ (((*skb).nh.arph)->ar_pln), sizeof(uint32_t));
-+ if (FWINV(info->daddr != (dst & info->dmsk),
-+ EBT_ARP_DST_IP))
-+ return EBT_NOMATCH;
-+ }
-+ }
-+
-+ if (info->bitmask & (EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC))
-+ {
-+ uint32_t arp_len = sizeof(struct arphdr) +
-+ (2 * (((*skb).nh.arph)->ar_hln)) +
-+ (2 * (((*skb).nh.arph)->ar_pln));
-+ unsigned char dst[ETH_ALEN];
-+ unsigned char src[ETH_ALEN];
-+
-+ // Make sure the packet is long enough.
-+ if ((((*skb).nh.raw) + arp_len) > (*skb).tail)
-+ return EBT_NOMATCH;
-+ // MAC addresses are 6 bytes.
-+ if (((*skb).nh.arph)->ar_hln != ETH_ALEN)
-+ return EBT_NOMATCH;
-+ if (info->bitmask & EBT_ARP_SRC_MAC) {
-+ uint8_t verdict, i;
-+
-+ memcpy(&src, ((*skb).nh.raw) +
-+ sizeof(struct arphdr),
-+ ETH_ALEN);
-+ verdict = 0;
-+ for (i = 0; i < 6; i++)
-+ verdict |= (src[i] ^ info->smaddr[i]) &
-+ info->smmsk[i];
-+ if (FWINV(verdict != 0, EBT_ARP_SRC_MAC))
-+ return EBT_NOMATCH;
-+ }
-+
-+ if (info->bitmask & EBT_ARP_DST_MAC) {
-+ uint8_t verdict, i;
-+
-+ memcpy(&dst, ((*skb).nh.raw) +
-+ sizeof(struct arphdr) +
-+ (((*skb).nh.arph)->ar_hln) +
-+ (((*skb).nh.arph)->ar_pln),
-+ ETH_ALEN);
-+ verdict = 0;
-+ for (i = 0; i < 6; i++)
-+ verdict |= (dst[i] ^ info->dmaddr[i]) &
-+ info->dmmsk[i];
-+ if (FWINV(verdict != 0, EBT_ARP_DST_MAC))
-+ return EBT_NOMATCH;
-+ }
-+ }
++ struct ebt_nat_info *info = (struct ebt_nat_info *) data;
+
-+ return EBT_MATCH;
++ memcpy(((**pskb).mac.ethernet)->h_source, info->mac,
++ ETH_ALEN * sizeof(unsigned char));
++ return info->target;
+}
+
-+static int ebt_arp_check(const char *tablename, unsigned int hookmask,
++static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
+ const struct ebt_entry *e, void *data, unsigned int datalen)
+{
-+ struct ebt_arp_info *info = (struct ebt_arp_info *)data;
++ struct ebt_nat_info *info = (struct ebt_nat_info *) data;
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_arp_info)))
++ if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
+ return -EINVAL;
-+ if ((e->ethproto != __constant_htons(ETH_P_ARP) &&
-+ e->ethproto != __constant_htons(ETH_P_RARP)) ||
-+ e->invflags & EBT_IPROTO)
++ if (BASE_CHAIN && info->target == EBT_RETURN)
+ return -EINVAL;
-+ if (info->bitmask & ~EBT_ARP_MASK || info->invflags & ~EBT_ARP_MASK)
++ CLEAR_BASE_CHAIN_BIT;
++ if (strcmp(tablename, "nat"))
++ return -EINVAL;
++ if (hookmask & ~(1 << NF_BR_POST_ROUTING))
++ return -EINVAL;
++ if (INVALID_TARGET)
+ return -EINVAL;
+ return 0;
+}
+
-+static struct ebt_match filter_arp =
++static struct ebt_target snat =
+{
-+ {NULL, NULL}, EBT_ARP_MATCH, ebt_filter_arp, ebt_arp_check, NULL,
-+ THIS_MODULE
++ {NULL, NULL}, EBT_SNAT_TARGET, ebt_target_snat, ebt_target_snat_check,
++ NULL, THIS_MODULE
+};
+
+static int __init init(void)
+{
-+ return ebt_register_match(&filter_arp);
++ return ebt_register_target(&snat);
+}
+
+static void __exit fini(void)
+{
-+ ebt_unregister_match(&filter_arp);
++ ebt_unregister_target(&snat);
+}
+
+module_init(init);
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_arpreply.c linux/net/bridge/netfilter/ebt_arpreply.c
---- linux.stock/net/bridge/netfilter/ebt_arpreply.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_arpreply.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,86 @@
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebt_dnat.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,65 @@
+/*
-+ * ebt_arpreply
++ * ebt_dnat
+ *
+ * Authors:
-+ * Grzegorz Borowiak <grzes@gnu.univ.gda.pl>
-+ * Bart De Schuymer <bdschuym@pandora.be>
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
-+ * August, 2003
++ * June, 2002
+ *
+ */
+
+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_arpreply.h>
-+#include <linux/if_arp.h>
-+#include <net/arp.h>
++#include <linux/netfilter_bridge/ebt_nat.h>
+#include <linux/module.h>
++#include <net/sock.h>
+
-+static int ebt_target_reply(struct sk_buff **pskb, unsigned int hooknr,
++static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr,
+ const struct net_device *in, const struct net_device *out,
+ const void *data, unsigned int datalen)
+{
-+ struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data;
-+ struct arphdr *ah;
-+ unsigned char *sha, *arp_ptr;
-+ u32 sip, tip;
++ struct ebt_nat_info *info = (struct ebt_nat_info *)data;
+
-+ ah = (**pskb).nh.arph;
-+ if (ah->ar_op != __constant_htons(ARPOP_REQUEST) ||
-+ ah->ar_hln != ETH_ALEN || ah->ar_pro != htons(ETH_P_IP) ||
-+ ah->ar_pln != 4)
-+ return EBT_CONTINUE;
-+
-+ arp_ptr = (unsigned char *)(ah + 1);
-+
-+ /* get source and target IP */
-+ sha = arp_ptr;
-+ arp_ptr += ETH_ALEN;
-+ memcpy(&sip, arp_ptr, 4);
-+ arp_ptr += 4 + ETH_ALEN;
-+ memcpy(&tip, arp_ptr, 4);
-+
-+ arp_send(ARPOP_REPLY, ETH_P_ARP, sip, in, tip, sha, info->mac, sha);
-+
-+ return info->target;
-+}
-+
-+static int ebt_target_reply_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
-+{
-+ struct ebt_arpreply_info *info = (struct ebt_arpreply_info *)data;
-+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_arpreply_info)))
-+ return -EINVAL;
-+ if (BASE_CHAIN && info->target == EBT_RETURN)
-+ return -EINVAL;
-+ if (e->ethproto != __constant_htons(ETH_P_ARP) ||
-+ e->invflags & EBT_IPROTO)
-+ return -EINVAL;
-+ CLEAR_BASE_CHAIN_BIT;
-+ if (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING))
-+ return -EINVAL;
-+ return 0;
-+}
-+
-+static struct ebt_target reply_target =
-+{
-+ .name = EBT_ARPREPLY_TARGET,
-+ .target = ebt_target_reply,
-+ .check = ebt_target_reply_check,
-+ .me = THIS_MODULE,
-+};
-+
-+static int __init init(void)
-+{
-+ return ebt_register_target(&reply_target);
-+}
-+
-+static void __exit fini(void)
-+{
-+ ebt_unregister_target(&reply_target);
-+}
-+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_dnat.c linux/net/bridge/netfilter/ebt_dnat.c
---- linux.stock/net/bridge/netfilter/ebt_dnat.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_dnat.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,65 @@
-+/*
-+ * ebt_dnat
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * June, 2002
-+ *
-+ */
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_nat.h>
-+#include <linux/module.h>
-+#include <net/sock.h>
-+
-+static int ebt_target_dnat(struct sk_buff **pskb, unsigned int hooknr,
-+ const struct net_device *in, const struct net_device *out,
-+ const void *data, unsigned int datalen)
-+{
-+ struct ebt_nat_info *info = (struct ebt_nat_info *)data;
-+
-+ memcpy(((**pskb).mac.ethernet)->h_dest, info->mac,
-+ ETH_ALEN * sizeof(unsigned char));
-+ return info->target;
-+}
++ memcpy(((**pskb).mac.ethernet)->h_dest, info->mac,
++ ETH_ALEN * sizeof(unsigned char));
++ return info->target;
++}
+
+static int ebt_target_dnat_check(const char *tablename, unsigned int hookmask,
+ const struct ebt_entry *e, void *data, unsigned int datalen)
+module_exit(fini);
+EXPORT_NO_SYMBOLS;
+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_ip.c linux/net/bridge/netfilter/ebt_ip.c
---- linux.stock/net/bridge/netfilter/ebt_ip.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_ip.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,121 @@
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/netfilter/ebtables.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,1490 @@
+/*
-+ * ebt_ip
++ * ebtables
+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ * Author:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
+ *
-+ * April, 2002
++ * ebtables.c,v 2.0, July, 2002
+ *
-+ * Changes:
-+ * added ip-sport and ip-dport
-+ * Innominate Security Technologies AG <mhopf@innominate.com>
-+ * September, 2002
++ * This code is stongly inspired on the iptables code which is
++ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version
++ * 2 of the License, or (at your option) any later version.
+ */
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_ip.h>
-+#include <linux/ip.h>
-+#include <linux/in.h>
-+#include <linux/module.h>
++// used for print_string
++#include <linux/sched.h>
++#include <linux/tty.h>
+
-+struct tcpudphdr {
-+ uint16_t src;
-+ uint16_t dst;
-+};
++#include <linux/kmod.h>
++#include <linux/module.h>
++#include <linux/vmalloc.h>
++#include <linux/netfilter_bridge/ebtables.h>
++#include <linux/spinlock.h>
++#include <asm/uaccess.h>
++#include <linux/smp.h>
++#include <net/sock.h>
++// needed for logical [in,out]-dev filtering
++#include "../br_private.h"
+
-+union h_u {
-+ unsigned char *raw;
-+ struct tcpudphdr *tuh;
-+};
++// list_named_find
++#define ASSERT_READ_LOCK(x)
++#define ASSERT_WRITE_LOCK(x)
++#include <linux/netfilter_ipv4/listhelp.h>
+
-+static int ebt_filter_ip(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *data,
-+ unsigned int datalen)
++#if 0 // use this for remote debugging
++// Copyright (C) 1998 by Ori Pomerantz
++// Print the string to the appropriate tty, the one
++// the current task uses
++static void print_string(char *str)
+{
-+ struct ebt_ip_info *info = (struct ebt_ip_info *)data;
++ struct tty_struct *my_tty;
+
-+ if (info->bitmask & EBT_IP_TOS &&
-+ FWINV(info->tos != ((*skb).nh.iph)->tos, EBT_IP_TOS))
-+ return EBT_NOMATCH;
-+ if (info->bitmask & EBT_IP_PROTO) {
-+ if (FWINV(info->protocol != ((*skb).nh.iph)->protocol,
-+ EBT_IP_PROTO))
-+ return EBT_NOMATCH;
-+ if ( info->protocol == IPPROTO_TCP ||
-+ info->protocol == IPPROTO_UDP )
-+ {
-+ union h_u h;
-+ h.raw = skb->data + skb->nh.iph->ihl*4;
-+ if (info->bitmask & EBT_IP_DPORT) {
-+ uint16_t port = ntohs(h.tuh->dst);
-+ if (FWINV(port < info->dport[0] ||
-+ port > info->dport[1],
-+ EBT_IP_DPORT))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_IP_SPORT) {
-+ uint16_t port = ntohs(h.tuh->src);
-+ if (FWINV(port < info->sport[0] ||
-+ port > info->sport[1],
-+ EBT_IP_SPORT))
-+ return EBT_NOMATCH;
-+ }
-+ }
++ /* The tty for the current task */
++ my_tty = current->tty;
++ if (my_tty != NULL) {
++ (*(my_tty->driver).write)(my_tty, 0, str, strlen(str));
++ (*(my_tty->driver).write)(my_tty, 0, "\015\012", 2);
+ }
-+ if (info->bitmask & EBT_IP_SOURCE &&
-+ FWINV((((*skb).nh.iph)->saddr & info->smsk) !=
-+ info->saddr, EBT_IP_SOURCE))
-+ return EBT_NOMATCH;
-+ if ((info->bitmask & EBT_IP_DEST) &&
-+ FWINV((((*skb).nh.iph)->daddr & info->dmsk) !=
-+ info->daddr, EBT_IP_DEST))
-+ return EBT_NOMATCH;
-+ return EBT_MATCH;
+}
+
-+static int ebt_ip_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
-+{
-+ struct ebt_ip_info *info = (struct ebt_ip_info *)data;
-+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_ip_info)))
-+ return -EINVAL;
-+ if (e->ethproto != __constant_htons(ETH_P_IP) ||
-+ e->invflags & EBT_IPROTO)
-+ return -EINVAL;
-+ if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
-+ return -EINVAL;
-+ if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
-+ if (!info->bitmask & EBT_IPROTO)
-+ return -EINVAL;
-+ if (info->protocol != IPPROTO_TCP &&
-+ info->protocol != IPPROTO_UDP)
-+ return -EINVAL;
-+ }
-+ if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
-+ return -EINVAL;
-+ if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
-+ return -EINVAL;
-+ return 0;
-+}
++#define BUGPRINT(args) print_string(args);
++#else
++#define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\
++ "report to author: "format, ## args)
++// #define BUGPRINT(format, args...)
++#endif
++#define MEMPRINT(format, args...) printk("kernel msg: ebtables "\
++ ": out of memory: "format, ## args)
++// #define MEMPRINT(format, args...)
+
-+static struct ebt_match filter_ip =
-+{
-+ {NULL, NULL}, EBT_IP_MATCH, ebt_filter_ip, ebt_ip_check, NULL,
-+ THIS_MODULE
-+};
+
-+static int __init init(void)
-+{
-+ return ebt_register_match(&filter_ip);
-+}
+
-+static void __exit fini(void)
-+{
-+ ebt_unregister_match(&filter_ip);
-+}
++// Each cpu has its own set of counters, so there is no need for write_lock in
++// the softirq
++// For reading or updating the counters, the user context needs to
++// get a write_lock
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_limit.c linux/net/bridge/netfilter/ebt_limit.c
---- linux.stock/net/bridge/netfilter/ebt_limit.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_limit.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,101 @@
-+/*
-+ * ebt_limit
-+ *
-+ * Authors:
-+ * Tom Marshall <tommy@home.tig-grr.com>
-+ *
-+ * Mostly copied from netfilter's ipt_limit.c, see that file for explanation
-+ *
-+ * September, 2003
-+ *
-+ */
++// The size of each set of counters is altered to get cache alignment
++#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
++#define COUNTER_OFFSET(n) (SMP_ALIGN(n * sizeof(struct ebt_counter)))
++#define COUNTER_BASE(c, n, cpu) ((struct ebt_counter *)(((char *)c) + \
++ COUNTER_OFFSET(n) * cpu))
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_limit.h>
-+#include <linux/module.h>
+
-+#include <linux/netdevice.h>
-+#include <linux/spinlock.h>
+
-+static spinlock_t limit_lock = SPIN_LOCK_UNLOCKED;
++static DECLARE_MUTEX(ebt_mutex);
++static LIST_HEAD(ebt_tables);
++static LIST_HEAD(ebt_targets);
++static LIST_HEAD(ebt_matches);
++static LIST_HEAD(ebt_watchers);
+
-+#define CREDITS_PER_JIFFY 128
++static struct ebt_target ebt_standard_target =
++{ {NULL, NULL}, EBT_STANDARD_TARGET, NULL, NULL, NULL, NULL};
+
-+static int ebt_limit_match(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *data, unsigned int datalen)
++static inline int ebt_do_watcher (struct ebt_entry_watcher *w,
++ const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out)
+{
-+ struct ebt_limit_info *info = (struct ebt_limit_info *)data;
-+ unsigned long now = jiffies;
-+
-+ spin_lock_bh(&limit_lock);
-+ info->credit += (now - xchg(&info->prev, now)) * CREDITS_PER_JIFFY;
-+ if (info->credit > info->credit_cap)
-+ info->credit = info->credit_cap;
-+
-+ if (info->credit >= info->cost) {
-+ /* We're not limited. */
-+ info->credit -= info->cost;
-+ spin_unlock_bh(&limit_lock);
-+ return EBT_MATCH;
-+ }
-+
-+ spin_unlock_bh(&limit_lock);
-+ return EBT_NOMATCH;
++ w->u.watcher->watcher(skb, in, out, w->data,
++ w->watcher_size);
++ // watchers don't give a verdict
++ return 0;
+}
+
-+/* Precision saver. */
-+static u_int32_t
-+user2credits(u_int32_t user)
++static inline int ebt_do_match (struct ebt_entry_match *m,
++ const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out)
+{
-+ /* If multiplying would overflow... */
-+ if (user > 0xFFFFFFFF / (HZ*CREDITS_PER_JIFFY))
-+ /* Divide first. */
-+ return (user / EBT_LIMIT_SCALE) * HZ * CREDITS_PER_JIFFY;
++ return m->u.match->match(skb, in, out, m->data,
++ m->match_size);
++}
+
-+ return (user * HZ * CREDITS_PER_JIFFY) / EBT_LIMIT_SCALE;
++static inline int ebt_dev_check(char *entry, const struct net_device *device)
++{
++ if (*entry == '\0')
++ return 0;
++ if (!device)
++ return 1;
++ return !!strcmp(entry, device->name);
+}
+
-+static int ebt_limit_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
++#define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg))
++// process standard matches
++static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h,
++ const struct net_device *in, const struct net_device *out)
+{
-+ struct ebt_limit_info *info = (struct ebt_limit_info *)data;
++ int verdict, i;
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_limit_info)))
-+ return -EINVAL;
++ if (e->bitmask & EBT_802_3) {
++ if (FWINV2(ntohs(h->h_proto) >= 1536, EBT_IPROTO))
++ return 1;
++ } else if (!(e->bitmask & EBT_NOPROTO) &&
++ FWINV2(e->ethproto != h->h_proto, EBT_IPROTO))
++ return 1;
+
-+ /* Check for overflow. */
-+ if (info->burst == 0
-+ || user2credits(info->avg * info->burst) < user2credits(info->avg)) {
-+ printk("Overflow in ebt_limit: %u/%u\n",
-+ info->avg, info->burst);
-+ return -EINVAL;
-+ }
++ if (FWINV2(ebt_dev_check(e->in, in), EBT_IIN))
++ return 1;
++ if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT))
++ return 1;
++ if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check(
++ e->logical_in, &in->br_port->br->dev), EBT_ILOGICALIN))
++ return 1;
++ if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check(
++ e->logical_out, &out->br_port->br->dev), EBT_ILOGICALOUT))
++ return 1;
+
-+ /* User avg in seconds * EBT_LIMIT_SCALE: convert to jiffies * 128. */
-+ info->prev = jiffies;
-+ info->credit = user2credits(info->avg * info->burst);
-+ info->credit_cap = user2credits(info->avg * info->burst);
-+ info->cost = user2credits(info->avg);
++ if (e->bitmask & EBT_SOURCEMAC) {
++ verdict = 0;
++ for (i = 0; i < 6; i++)
++ verdict |= (h->h_source[i] ^ e->sourcemac[i]) &
++ e->sourcemsk[i];
++ if (FWINV2(verdict != 0, EBT_ISOURCE) )
++ return 1;
++ }
++ if (e->bitmask & EBT_DESTMAC) {
++ verdict = 0;
++ for (i = 0; i < 6; i++)
++ verdict |= (h->h_dest[i] ^ e->destmac[i]) &
++ e->destmsk[i];
++ if (FWINV2(verdict != 0, EBT_IDEST) )
++ return 1;
++ }
+ return 0;
+}
+
-+static struct ebt_match ebt_limit_reg =
-+{
-+ {NULL, NULL}, EBT_LIMIT_MATCH, ebt_limit_match, ebt_limit_check, NULL,
-+ THIS_MODULE
-+};
-+
-+static int __init init(void)
++// Do some firewalling
++unsigned int ebt_do_table (unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ struct ebt_table *table)
+{
-+ return ebt_register_match(&ebt_limit_reg);
-+}
++ int i, nentries;
++ struct ebt_entry *point;
++ struct ebt_counter *counter_base, *cb_base;
++ struct ebt_entry_target *t;
++ int verdict, sp = 0;
++ struct ebt_chainstack *cs;
++ struct ebt_entries *chaininfo;
++ char *base;
++ struct ebt_table_info *private = table->private;
+
-+static void __exit fini(void)
-+{
-+ ebt_unregister_match(&ebt_limit_reg);
-+}
++ read_lock_bh(&table->lock);
++ cb_base = COUNTER_BASE(private->counters, private->nentries,
++ cpu_number_map(smp_processor_id()));
++ if (private->chainstack)
++ cs = private->chainstack[cpu_number_map(smp_processor_id())];
++ else
++ cs = NULL;
++ chaininfo = private->hook_entry[hook];
++ nentries = private->hook_entry[hook]->nentries;
++ point = (struct ebt_entry *)(private->hook_entry[hook]->data);
++ counter_base = cb_base + private->hook_entry[hook]->counter_offset;
++ // base for chain jumps
++ base = private->entries;
++ i = 0;
++ while (i < nentries) {
++ if (ebt_basic_match(point, (**pskb).mac.ethernet, in, out))
++ goto letscontinue;
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_log.c linux/net/bridge/netfilter/ebt_log.c
---- linux.stock/net/bridge/netfilter/ebt_log.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_log.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,152 @@
-+/*
-+ * ebt_log
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * April, 2002
-+ *
-+ */
++ if (EBT_MATCH_ITERATE(point, ebt_do_match, *pskb, in, out) != 0)
++ goto letscontinue;
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_log.h>
-+#include <linux/module.h>
-+#include <linux/ip.h>
-+#include <linux/in.h>
-+#include <linux/if_arp.h>
-+#include <linux/spinlock.h>
++ // increase counter
++ (*(counter_base + i)).pcnt++;
++ (*(counter_base + i)).bcnt+=(**pskb).len;
+
-+static spinlock_t ebt_log_lock = SPIN_LOCK_UNLOCKED;
++ // these should only watch: not modify, nor tell us
++ // what to do with the packet
++ EBT_WATCHER_ITERATE(point, ebt_do_watcher, *pskb, in,
++ out);
+
-+static int ebt_log_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
-+{
-+ struct ebt_log_info *info = (struct ebt_log_info *)data;
++ t = (struct ebt_entry_target *)
++ (((char *)point) + point->target_offset);
++ // standard target
++ if (!t->u.target->target)
++ verdict = ((struct ebt_standard_target *)t)->verdict;
++ else
++ verdict = t->u.target->target(pskb, hook,
++ in, out, t->data, t->target_size);
++ if (verdict == EBT_ACCEPT) {
++ read_unlock_bh(&table->lock);
++ return NF_ACCEPT;
++ }
++ if (verdict == EBT_DROP) {
++ read_unlock_bh(&table->lock);
++ return NF_DROP;
++ }
++ if (verdict == EBT_RETURN) {
++letsreturn:
++#ifdef CONFIG_NETFILTER_DEBUG
++ if (sp == 0) {
++ BUGPRINT("RETURN on base chain");
++ // act like this is EBT_CONTINUE
++ goto letscontinue;
++ }
++#endif
++ sp--;
++ // put all the local variables right
++ i = cs[sp].n;
++ chaininfo = cs[sp].chaininfo;
++ nentries = chaininfo->nentries;
++ point = cs[sp].e;
++ counter_base = cb_base +
++ chaininfo->counter_offset;
++ continue;
++ }
++ if (verdict == EBT_CONTINUE)
++ goto letscontinue;
++#ifdef CONFIG_NETFILTER_DEBUG
++ if (verdict < 0) {
++ BUGPRINT("bogus standard verdict\n");
++ read_unlock_bh(&table->lock);
++ return NF_DROP;
++ }
++#endif
++ // jump to a udc
++ cs[sp].n = i + 1;
++ cs[sp].chaininfo = chaininfo;
++ cs[sp].e = (struct ebt_entry *)
++ (((char *)point) + point->next_offset);
++ i = 0;
++ chaininfo = (struct ebt_entries *) (base + verdict);
++#ifdef CONFIG_NETFILTER_DEBUG
++ if (chaininfo->distinguisher) {
++ BUGPRINT("jump to non-chain\n");
++ read_unlock_bh(&table->lock);
++ return NF_DROP;
++ }
++#endif
++ nentries = chaininfo->nentries;
++ point = (struct ebt_entry *)chaininfo->data;
++ counter_base = cb_base + chaininfo->counter_offset;
++ sp++;
++ continue;
++letscontinue:
++ point = (struct ebt_entry *)
++ (((char *)point) + point->next_offset);
++ i++;
++ }
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_log_info)))
-+ return -EINVAL;
-+ if (info->bitmask & ~EBT_LOG_MASK)
-+ return -EINVAL;
-+ if (info->loglevel >= 8)
-+ return -EINVAL;
-+ info->prefix[EBT_LOG_PREFIX_SIZE - 1] = '\0';
-+ return 0;
++ // I actually like this :)
++ if (chaininfo->policy == EBT_RETURN)
++ goto letsreturn;
++ if (chaininfo->policy == EBT_ACCEPT) {
++ read_unlock_bh(&table->lock);
++ return NF_ACCEPT;
++ }
++ read_unlock_bh(&table->lock);
++ return NF_DROP;
+}
+
-+struct tcpudphdr
-+{
-+ uint16_t src;
-+ uint16_t dst;
-+};
-+
-+struct arppayload
++// If it succeeds, returns element and locks mutex
++static inline void *
++find_inlist_lock_noload(struct list_head *head, const char *name, int *error,
++ struct semaphore *mutex)
+{
-+ unsigned char mac_src[ETH_ALEN];
-+ unsigned char ip_src[4];
-+ unsigned char mac_dst[ETH_ALEN];
-+ unsigned char ip_dst[4];
-+};
++ void *ret;
+
-+static void print_MAC(unsigned char *p)
-+{
-+ int i;
++ *error = down_interruptible(mutex);
++ if (*error != 0)
++ return NULL;
+
-+ for (i = 0; i < ETH_ALEN; i++, p++)
-+ printk("%02x%c", *p, i == ETH_ALEN - 1 ? ' ':':');
++ ret = list_named_find(head, name);
++ if (!ret) {
++ *error = -ENOENT;
++ up(mutex);
++ }
++ return ret;
+}
+
-+#define myNIPQUAD(a) a[0], a[1], a[2], a[3]
-+static void ebt_log(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *data, unsigned int datalen)
++#ifndef CONFIG_KMOD
++#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
++#else
++static void *
++find_inlist_lock(struct list_head *head, const char *name, const char *prefix,
++ int *error, struct semaphore *mutex)
+{
-+ struct ebt_log_info *info = (struct ebt_log_info *)data;
-+ char level_string[4] = "< >";
-+ level_string[1] = '0' + info->loglevel;
-+
-+ spin_lock_bh(&ebt_log_lock);
-+ printk(level_string);
-+ printk("%s IN=%s OUT=%s ", info->prefix, in ? in->name : "",
-+ out ? out->name : "");
-+
-+ printk("MAC source = ");
-+ print_MAC((skb->mac.ethernet)->h_source);
-+ printk("MAC dest = ");
-+ print_MAC((skb->mac.ethernet)->h_dest);
-+
-+ printk("proto = 0x%04x", ntohs(((*skb).mac.ethernet)->h_proto));
-+
-+ if ((info->bitmask & EBT_LOG_IP) && skb->mac.ethernet->h_proto ==
-+ htons(ETH_P_IP)){
-+ struct iphdr *iph = skb->nh.iph;
-+ printk(" IP SRC=%u.%u.%u.%u IP DST=%u.%u.%u.%u,",
-+ NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-+ printk(" IP tos=0x%02X, IP proto=%d", iph->tos, iph->protocol);
-+ if (iph->protocol == IPPROTO_TCP ||
-+ iph->protocol == IPPROTO_UDP) {
-+ struct tcpudphdr *ports = (struct tcpudphdr *)(skb->data + iph->ihl*4);
-+
-+ if (skb->data + iph->ihl*4 > skb->tail) {
-+ printk(" INCOMPLETE TCP/UDP header");
-+ goto out;
-+ }
-+ printk(" SPT=%u DPT=%u", ntohs(ports->src),
-+ ntohs(ports->dst));
-+ }
-+ goto out;
-+ }
-+
-+ if ((info->bitmask & EBT_LOG_ARP) &&
-+ ((skb->mac.ethernet->h_proto == __constant_htons(ETH_P_ARP)) ||
-+ (skb->mac.ethernet->h_proto == __constant_htons(ETH_P_RARP)))) {
-+ struct arphdr * arph = skb->nh.arph;
-+ printk(" ARP HTYPE=%d, PTYPE=0x%04x, OPCODE=%d",
-+ ntohs(arph->ar_hrd), ntohs(arph->ar_pro),
-+ ntohs(arph->ar_op));
-+ /* If it's for Ethernet and the lengths are OK,
-+ * then log the ARP payload */
-+ if (arph->ar_hrd == __constant_htons(1) &&
-+ arph->ar_hln == ETH_ALEN &&
-+ arph->ar_pln == sizeof(uint32_t)) {
-+ struct arppayload *arpp = (struct arppayload *)(skb->data + sizeof(*arph));
-+
-+ if (skb->data + sizeof(*arph) > skb->tail) {
-+ printk(" INCOMPLETE ARP header");
-+ goto out;
-+ }
-+
-+ printk(" ARP MAC SRC=");
-+ print_MAC(arpp->mac_src);
-+ printk(" ARP IP SRC=%u.%u.%u.%u",
-+ myNIPQUAD(arpp->ip_src));
-+ printk(" ARP MAC DST=");
-+ print_MAC(arpp->mac_dst);
-+ printk(" ARP IP DST=%u.%u.%u.%u",
-+ myNIPQUAD(arpp->ip_dst));
-+ }
++ void *ret;
+
++ ret = find_inlist_lock_noload(head, name, error, mutex);
++ if (!ret) {
++ char modulename[EBT_FUNCTION_MAXNAMELEN + strlen(prefix) + 1];
++ strcpy(modulename, prefix);
++ strcat(modulename, name);
++ request_module(modulename);
++ ret = find_inlist_lock_noload(head, name, error, mutex);
+ }
-+out:
-+ printk("\n");
-+ spin_unlock_bh(&ebt_log_lock);
++ return ret;
+}
++#endif
+
-+static struct ebt_watcher log =
++static inline struct ebt_table *
++find_table_lock(const char *name, int *error, struct semaphore *mutex)
+{
-+ {NULL, NULL}, EBT_LOG_WATCHER, ebt_log, ebt_log_check, NULL,
-+ THIS_MODULE
-+};
++ return find_inlist_lock(&ebt_tables, name, "ebtable_", error, mutex);
++}
+
-+static int __init init(void)
++static inline struct ebt_match *
++find_match_lock(const char *name, int *error, struct semaphore *mutex)
+{
-+ return ebt_register_watcher(&log);
++ return find_inlist_lock(&ebt_matches, name, "ebt_", error, mutex);
+}
+
-+static void __exit fini(void)
++static inline struct ebt_watcher *
++find_watcher_lock(const char *name, int *error, struct semaphore *mutex)
+{
-+ ebt_unregister_watcher(&log);
++ return find_inlist_lock(&ebt_watchers, name, "ebt_", error, mutex);
+}
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_mark.c linux/net/bridge/netfilter/ebt_mark.c
---- linux.stock/net/bridge/netfilter/ebt_mark.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_mark.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,66 @@
-+/*
-+ * ebt_mark
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * July, 2002
-+ *
-+ */
-+
-+// The mark target can be used in any chain
-+// I believe adding a mangle table just for marking is total overkill
-+// Marking a frame doesn't really change anything in the frame anyway
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_mark_t.h>
-+#include <linux/module.h>
-+
-+static int ebt_target_mark(struct sk_buff **pskb, unsigned int hooknr,
-+ const struct net_device *in, const struct net_device *out,
-+ const void *data, unsigned int datalen)
++static inline struct ebt_target *
++find_target_lock(const char *name, int *error, struct semaphore *mutex)
+{
-+ struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
-+
-+ if ((*pskb)->nfmark != info->mark) {
-+ (*pskb)->nfmark = info->mark;
-+ (*pskb)->nfcache |= NFC_ALTERED;
-+ }
-+ return info->target;
++ return find_inlist_lock(&ebt_targets, name, "ebt_", error, mutex);
+}
+
-+static int ebt_target_mark_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
++static inline int
++ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
++ const char *name, unsigned int hookmask, unsigned int *cnt)
+{
-+ struct ebt_mark_t_info *info = (struct ebt_mark_t_info *)data;
++ struct ebt_match *match;
++ int ret;
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_t_info)))
-+ return -EINVAL;
-+ if (BASE_CHAIN && info->target == EBT_RETURN)
++ if (((char *)m) + m->match_size + sizeof(struct ebt_entry_match) >
++ ((char *)e) + e->watchers_offset)
+ return -EINVAL;
-+ CLEAR_BASE_CHAIN_BIT;
-+ if (INVALID_TARGET)
++ match = find_match_lock(m->u.name, &ret, &ebt_mutex);
++ if (!match)
++ return ret;
++ m->u.match = match;
++ if (match->me)
++ __MOD_INC_USE_COUNT(match->me);
++ up(&ebt_mutex);
++ if (match->check &&
++ match->check(name, hookmask, e, m->data, m->match_size) != 0) {
++ BUGPRINT("match->check failed\n");
++ if (match->me)
++ __MOD_DEC_USE_COUNT(match->me);
+ return -EINVAL;
++ }
++ (*cnt)++;
+ return 0;
+}
+
-+static struct ebt_target mark_target =
-+{
-+ {NULL, NULL}, EBT_MARK_TARGET, ebt_target_mark,
-+ ebt_target_mark_check, NULL, THIS_MODULE
-+};
-+
-+static int __init init(void)
-+{
-+ return ebt_register_target(&mark_target);
-+}
-+
-+static void __exit fini(void)
-+{
-+ ebt_unregister_target(&mark_target);
-+}
-+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_mark_m.c linux/net/bridge/netfilter/ebt_mark_m.c
---- linux.stock/net/bridge/netfilter/ebt_mark_m.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_mark_m.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,61 @@
-+/*
-+ * ebt_mark_m
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * July, 2002
-+ *
-+ */
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_mark_m.h>
-+#include <linux/module.h>
-+
-+static int ebt_filter_mark(const struct sk_buff *skb,
-+ const struct net_device *in, const struct net_device *out, const void *data,
-+ unsigned int datalen)
-+{
-+ struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
-+
-+ if (info->bitmask & EBT_MARK_OR)
-+ return !(!!(skb->nfmark & info->mask) ^ info->invert);
-+ return !(((skb->nfmark & info->mask) == info->mark) ^ info->invert);
-+}
-+
-+static int ebt_mark_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
++static inline int
++ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
++ const char *name, unsigned int hookmask, unsigned int *cnt)
+{
-+ struct ebt_mark_m_info *info = (struct ebt_mark_m_info *) data;
++ struct ebt_watcher *watcher;
++ int ret;
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
-+ return -EINVAL;
-+ if (info->bitmask & ~EBT_MARK_MASK)
-+ return -EINVAL;
-+ if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
++ if (((char *)w) + w->watcher_size + sizeof(struct ebt_entry_watcher) >
++ ((char *)e) + e->target_offset)
+ return -EINVAL;
-+ if (!info->bitmask)
++ watcher = find_watcher_lock(w->u.name, &ret, &ebt_mutex);
++ if (!watcher)
++ return ret;
++ w->u.watcher = watcher;
++ if (watcher->me)
++ __MOD_INC_USE_COUNT(watcher->me);
++ up(&ebt_mutex);
++ if (watcher->check &&
++ watcher->check(name, hookmask, e, w->data, w->watcher_size) != 0) {
++ BUGPRINT("watcher->check failed\n");
++ if (watcher->me)
++ __MOD_DEC_USE_COUNT(watcher->me);
+ return -EINVAL;
++ }
++ (*cnt)++;
+ return 0;
+}
+
-+static struct ebt_match filter_mark =
-+{
-+ {NULL, NULL}, EBT_MARK_MATCH, ebt_filter_mark, ebt_mark_check, NULL,
-+ THIS_MODULE
-+};
-+
-+static int __init init(void)
-+{
-+ return ebt_register_match(&filter_mark);
-+}
-+
-+static void __exit fini(void)
++// this one is very careful, as it is the first function
++// to parse the userspace data
++static inline int
++ebt_check_entry_size_and_hooks(struct ebt_entry *e,
++ struct ebt_table_info *newinfo, char *base, char *limit,
++ struct ebt_entries **hook_entries, unsigned int *n, unsigned int *cnt,
++ unsigned int *totalcnt, unsigned int *udc_cnt, unsigned int valid_hooks)
+{
-+ ebt_unregister_match(&filter_mark);
-+}
++ int i;
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_pkttype.c linux/net/bridge/netfilter/ebt_pkttype.c
---- linux.stock/net/bridge/netfilter/ebt_pkttype.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_pkttype.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,60 @@
-+/*
-+ * ebt_pkttype
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bdschuym@pandora.be>
-+ *
-+ * April, 2003
-+ *
-+ */
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_pkttype.h>
-+#include <linux/module.h>
-+
-+static int ebt_filter_pkttype(const struct sk_buff *skb,
-+ const struct net_device *in,
-+ const struct net_device *out,
-+ const void *data,
-+ unsigned int datalen)
-+{
-+ struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
-+
-+ return (skb->pkt_type != info->pkt_type) ^ info->invert;
-+}
-+
-+static int ebt_pkttype_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
-+{
-+ struct ebt_pkttype_info *info = (struct ebt_pkttype_info *)data;
-+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_pkttype_info)))
++ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
++ if ((valid_hooks & (1 << i)) == 0)
++ continue;
++ if ( (char *)hook_entries[i] - base ==
++ (char *)e - newinfo->entries)
++ break;
++ }
++ // beginning of a new chain
++ // if i == NF_BR_NUMHOOKS it must be a user defined chain
++ if (i != NF_BR_NUMHOOKS || !(e->bitmask & EBT_ENTRY_OR_ENTRIES)) {
++ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) != 0) {
++ // we make userspace set this right,
++ // so there is no misunderstanding
++ BUGPRINT("EBT_ENTRY_OR_ENTRIES shouldn't be set "
++ "in distinguisher\n");
++ return -EINVAL;
++ }
++ // this checks if the previous chain has as many entries
++ // as it said it has
++ if (*n != *cnt) {
++ BUGPRINT("nentries does not equal the nr of entries "
++ "in the chain\n");
++ return -EINVAL;
++ }
++ // before we look at the struct, be sure it is not too big
++ if ((char *)hook_entries[i] + sizeof(struct ebt_entries)
++ > limit) {
++ BUGPRINT("entries_size too small\n");
++ return -EINVAL;
++ }
++ if (((struct ebt_entries *)e)->policy != EBT_DROP &&
++ ((struct ebt_entries *)e)->policy != EBT_ACCEPT) {
++ // only RETURN from udc
++ if (i != NF_BR_NUMHOOKS ||
++ ((struct ebt_entries *)e)->policy != EBT_RETURN) {
++ BUGPRINT("bad policy\n");
++ return -EINVAL;
++ }
++ }
++ if (i == NF_BR_NUMHOOKS) // it's a user defined chain
++ (*udc_cnt)++;
++ else
++ newinfo->hook_entry[i] = (struct ebt_entries *)e;
++ if (((struct ebt_entries *)e)->counter_offset != *totalcnt) {
++ BUGPRINT("counter_offset != totalcnt");
++ return -EINVAL;
++ }
++ *n = ((struct ebt_entries *)e)->nentries;
++ *cnt = 0;
++ return 0;
++ }
++ // a plain old entry, heh
++ if (sizeof(struct ebt_entry) > e->watchers_offset ||
++ e->watchers_offset > e->target_offset ||
++ e->target_offset >= e->next_offset) {
++ BUGPRINT("entry offsets not in right order\n");
+ return -EINVAL;
-+ if (info->invert != 0 && info->invert != 1)
++ }
++ // this is not checked anywhere else
++ if (e->next_offset - e->target_offset < sizeof(struct ebt_entry_target)) {
++ BUGPRINT("target size too small\n");
+ return -EINVAL;
-+ /* Allow any pkt_type value */
++ }
++
++ (*cnt)++;
++ (*totalcnt)++;
+ return 0;
+}
+
-+static struct ebt_match filter_pkttype =
++struct ebt_cl_stack
+{
-+ .name = EBT_PKTTYPE_MATCH,
-+ .match = ebt_filter_pkttype,
-+ .check = ebt_pkttype_check,
-+ .me = THIS_MODULE,
++ struct ebt_chainstack cs;
++ int from;
++ unsigned int hookmask;
+};
+
-+static int __init init(void)
++// we need these positions to check that the jumps to a different part of the
++// entries is a jump to the beginning of a new chain.
++static inline int
++ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo,
++ struct ebt_entries **hook_entries, unsigned int *n, unsigned int valid_hooks,
++ struct ebt_cl_stack *udc)
+{
-+ return ebt_register_match(&filter_pkttype);
-+}
++ int i;
+
-+static void __exit fini(void)
-+{
-+ ebt_unregister_match(&filter_pkttype);
-+}
++ // we're only interested in chain starts
++ if (e->bitmask & EBT_ENTRY_OR_ENTRIES)
++ return 0;
++ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
++ if ((valid_hooks & (1 << i)) == 0)
++ continue;
++ if (newinfo->hook_entry[i] == (struct ebt_entries *)e)
++ break;
++ }
++ // only care about udc
++ if (i != NF_BR_NUMHOOKS)
++ return 0;
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_redirect.c linux/net/bridge/netfilter/ebt_redirect.c
---- linux.stock/net/bridge/netfilter/ebt_redirect.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_redirect.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,71 @@
-+/*
-+ * ebt_redirect
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * April, 2002
-+ *
-+ */
++ udc[*n].cs.chaininfo = (struct ebt_entries *)e;
++ // these initialisations are depended on later in check_chainloops()
++ udc[*n].cs.n = 0;
++ udc[*n].hookmask = 0;
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_redirect.h>
-+#include <linux/module.h>
-+#include <net/sock.h>
-+#include "../br_private.h"
++ (*n)++;
++ return 0;
++}
+
-+static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
-+ const struct net_device *in, const struct net_device *out,
-+ const void *data, unsigned int datalen)
++static inline int
++ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i)
+{
-+ struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
++ if (i && (*i)-- == 0)
++ return 1;
++ if (m->u.match->destroy)
++ m->u.match->destroy(m->data, m->match_size);
++ if (m->u.match->me)
++ __MOD_DEC_USE_COUNT(m->u.match->me);
+
-+ if (hooknr != NF_BR_BROUTING)
-+ memcpy((**pskb).mac.ethernet->h_dest,
-+ in->br_port->br->dev.dev_addr, ETH_ALEN);
-+ else {
-+ memcpy((**pskb).mac.ethernet->h_dest,
-+ in->dev_addr, ETH_ALEN);
-+ (*pskb)->pkt_type = PACKET_HOST;
-+ }
-+ return info->target;
++ return 0;
+}
+
-+static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
++static inline int
++ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i)
+{
-+ struct ebt_redirect_info *info = (struct ebt_redirect_info *)data;
++ if (i && (*i)-- == 0)
++ return 1;
++ if (w->u.watcher->destroy)
++ w->u.watcher->destroy(w->data, w->watcher_size);
++ if (w->u.watcher->me)
++ __MOD_DEC_USE_COUNT(w->u.watcher->me);
+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_redirect_info)))
-+ return -EINVAL;
-+ if (BASE_CHAIN && info->target == EBT_RETURN)
-+ return -EINVAL;
-+ CLEAR_BASE_CHAIN_BIT;
-+ if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
-+ (strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
-+ return -EINVAL;
-+ if (INVALID_TARGET)
-+ return -EINVAL;
+ return 0;
+}
+
-+static struct ebt_target redirect_target =
++static inline int
++ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt)
+{
-+ {NULL, NULL}, EBT_REDIRECT_TARGET, ebt_target_redirect,
-+ ebt_target_redirect_check, NULL, THIS_MODULE
-+};
++ struct ebt_entry_target *t;
+
-+static int __init init(void)
-+{
-+ return ebt_register_target(&redirect_target);
++ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
++ return 0;
++ // we're done
++ if (cnt && (*cnt)-- == 0)
++ return 1;
++ EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, NULL);
++ EBT_MATCH_ITERATE(e, ebt_cleanup_match, NULL);
++ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
++ if (t->u.target->destroy)
++ t->u.target->destroy(t->data, t->target_size);
++ if (t->u.target->me)
++ __MOD_DEC_USE_COUNT(t->u.target->me);
++
++ return 0;
+}
+
-+static void __exit fini(void)
++static inline int
++ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
++ const char *name, unsigned int *cnt, unsigned int valid_hooks,
++ struct ebt_cl_stack *cl_s, unsigned int udc_cnt)
+{
-+ ebt_unregister_target(&redirect_target);
-+}
++ struct ebt_entry_target *t;
++ struct ebt_target *target;
++ unsigned int i, j, hook = 0, hookmask = 0;
++ int ret;
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_snat.c linux/net/bridge/netfilter/ebt_snat.c
---- linux.stock/net/bridge/netfilter/ebt_snat.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_snat.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,64 @@
-+/*
-+ * ebt_snat
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * June, 2002
-+ *
-+ */
++ // Don't mess with the struct ebt_entries
++ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
++ return 0;
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_nat.h>
-+#include <linux/module.h>
-+
-+static int ebt_target_snat(struct sk_buff **pskb, unsigned int hooknr,
-+ const struct net_device *in, const struct net_device *out,
-+ const void *data, unsigned int datalen)
-+{
-+ struct ebt_nat_info *info = (struct ebt_nat_info *) data;
-+
-+ memcpy(((**pskb).mac.ethernet)->h_source, info->mac,
-+ ETH_ALEN * sizeof(unsigned char));
-+ return info->target;
-+}
-+
-+static int ebt_target_snat_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
-+{
-+ struct ebt_nat_info *info = (struct ebt_nat_info *) data;
-+
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_nat_info)))
-+ return -EINVAL;
-+ if (BASE_CHAIN && info->target == EBT_RETURN)
-+ return -EINVAL;
-+ CLEAR_BASE_CHAIN_BIT;
-+ if (strcmp(tablename, "nat"))
++ if (e->bitmask & ~EBT_F_MASK) {
++ BUGPRINT("Unknown flag for bitmask\n");
+ return -EINVAL;
-+ if (hookmask & ~(1 << NF_BR_POST_ROUTING))
++ }
++ if (e->invflags & ~EBT_INV_MASK) {
++ BUGPRINT("Unknown flag for inv bitmask\n");
+ return -EINVAL;
-+ if (INVALID_TARGET)
++ }
++ if ( (e->bitmask & EBT_NOPROTO) && (e->bitmask & EBT_802_3) ) {
++ BUGPRINT("NOPROTO & 802_3 not allowed\n");
+ return -EINVAL;
++ }
++ // what hook do we belong to?
++ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
++ if ((valid_hooks & (1 << i)) == 0)
++ continue;
++ if ((char *)newinfo->hook_entry[i] < (char *)e)
++ hook = i;
++ else
++ break;
++ }
++ // (1 << NF_BR_NUMHOOKS) tells the check functions the rule is on
++ // a base chain
++ if (i < NF_BR_NUMHOOKS)
++ hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
++ else {
++ for (i = 0; i < udc_cnt; i++)
++ if ((char *)(cl_s[i].cs.chaininfo) > (char *)e)
++ break;
++ if (i == 0)
++ hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
++ else
++ hookmask = cl_s[i - 1].hookmask;
++ }
++ i = 0;
++ ret = EBT_MATCH_ITERATE(e, ebt_check_match, e, name, hookmask, &i);
++ if (ret != 0)
++ goto cleanup_matches;
++ j = 0;
++ ret = EBT_WATCHER_ITERATE(e, ebt_check_watcher, e, name, hookmask, &j);
++ if (ret != 0)
++ goto cleanup_watchers;
++ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
++ target = find_target_lock(t->u.name, &ret, &ebt_mutex);
++ if (!target)
++ goto cleanup_watchers;
++ if (target->me)
++ __MOD_INC_USE_COUNT(target->me);
++ up(&ebt_mutex);
++
++ t->u.target = target;
++ if (t->u.target == &ebt_standard_target) {
++ if (e->target_offset + sizeof(struct ebt_standard_target) >
++ e->next_offset) {
++ BUGPRINT("Standard target size too big\n");
++ ret = -EFAULT;
++ goto cleanup_watchers;
++ }
++ if (((struct ebt_standard_target *)t)->verdict <
++ -NUM_STANDARD_TARGETS) {
++ BUGPRINT("Invalid standard target\n");
++ ret = -EFAULT;
++ goto cleanup_watchers;
++ }
++ } else if ((e->target_offset + t->target_size +
++ sizeof(struct ebt_entry_target) > e->next_offset) ||
++ (t->u.target->check &&
++ t->u.target->check(name, hookmask, e, t->data, t->target_size) != 0)){
++ if (t->u.target->me)
++ __MOD_DEC_USE_COUNT(t->u.target->me);
++ ret = -EFAULT;
++ goto cleanup_watchers;
++ }
++ (*cnt)++;
+ return 0;
++cleanup_watchers:
++ EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, &j);
++cleanup_matches:
++ EBT_MATCH_ITERATE(e, ebt_cleanup_match, &i);
++ return ret;
+}
+
-+static struct ebt_target snat =
++// checks for loops and sets the hook mask for udc
++// the hook mask for udc tells us from which base chains the udc can be
++// accessed. This mask is a parameter to the check() functions of the extensions
++static int check_chainloops(struct ebt_entries *chain,
++ struct ebt_cl_stack *cl_s, unsigned int udc_cnt,
++ unsigned int hooknr, char *base)
+{
-+ {NULL, NULL}, EBT_SNAT_TARGET, ebt_target_snat, ebt_target_snat_check,
-+ NULL, THIS_MODULE
-+};
++ int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict;
++ struct ebt_entry *e = (struct ebt_entry *)chain->data;
++ struct ebt_entry_target *t;
+
-+static int __init init(void)
-+{
-+ return ebt_register_target(&snat);
++ while (pos < nentries || chain_nr != -1) {
++ // end of udc, go back one 'recursion' step
++ if (pos == nentries) {
++ // put back values of the time when this chain was called
++ e = cl_s[chain_nr].cs.e;
++ if (cl_s[chain_nr].from != -1)
++ nentries =
++ cl_s[cl_s[chain_nr].from].cs.chaininfo->nentries;
++ else
++ nentries = chain->nentries;
++ pos = cl_s[chain_nr].cs.n;
++ // make sure we won't see a loop that isn't one
++ cl_s[chain_nr].cs.n = 0;
++ chain_nr = cl_s[chain_nr].from;
++ if (pos == nentries)
++ continue;
++ }
++ t = (struct ebt_entry_target *)
++ (((char *)e) + e->target_offset);
++ if (strcmp(t->u.name, EBT_STANDARD_TARGET))
++ goto letscontinue;
++ if (e->target_offset + sizeof(struct ebt_standard_target) >
++ e->next_offset) {
++ BUGPRINT("Standard target size too big\n");
++ return -1;
++ }
++ verdict = ((struct ebt_standard_target *)t)->verdict;
++ if (verdict >= 0) { // jump to another chain
++ struct ebt_entries *hlp2 =
++ (struct ebt_entries *)(base + verdict);
++ for (i = 0; i < udc_cnt; i++)
++ if (hlp2 == cl_s[i].cs.chaininfo)
++ break;
++ // bad destination or loop
++ if (i == udc_cnt) {
++ BUGPRINT("bad destination\n");
++ return -1;
++ }
++ if (cl_s[i].cs.n) {
++ BUGPRINT("loop\n");
++ return -1;
++ }
++ // this can't be 0, so the above test is correct
++ cl_s[i].cs.n = pos + 1;
++ pos = 0;
++ cl_s[i].cs.e = ((void *)e + e->next_offset);
++ e = (struct ebt_entry *)(hlp2->data);
++ nentries = hlp2->nentries;
++ cl_s[i].from = chain_nr;
++ chain_nr = i;
++ // this udc is accessible from the base chain for hooknr
++ cl_s[i].hookmask |= (1 << hooknr);
++ continue;
++ }
++letscontinue:
++ e = (void *)e + e->next_offset;
++ pos++;
++ }
++ return 0;
+}
+
-+static void __exit fini(void)
++// do the parsing of the table/chains/entries/matches/watchers/targets, heh
++static int translate_table(struct ebt_replace *repl,
++ struct ebt_table_info *newinfo)
+{
-+ ebt_unregister_target(&snat);
-+}
++ unsigned int i, j, k, udc_cnt;
++ int ret;
++ struct ebt_cl_stack *cl_s = NULL; // used in the checking for chain loops
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_stp.c linux/net/bridge/netfilter/ebt_stp.c
---- linux.stock/net/bridge/netfilter/ebt_stp.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_stp.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,191 @@
-+/*
-+ * ebt_stp
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bdschuym@pandora.be>
-+ * Stephen Hemminger <shemminger@osdl.org>
-+ *
-+ * June, 2003
-+ */
++ i = 0;
++ while (i < NF_BR_NUMHOOKS && !(repl->valid_hooks & (1 << i)))
++ i++;
++ if (i == NF_BR_NUMHOOKS) {
++ BUGPRINT("No valid hooks specified\n");
++ return -EINVAL;
++ }
++ if (repl->hook_entry[i] != (struct ebt_entries *)repl->entries) {
++ BUGPRINT("Chains don't start at beginning\n");
++ return -EINVAL;
++ }
++ // make sure chains are ordered after each other in same order
++ // as their corresponding hooks
++ for (j = i + 1; j < NF_BR_NUMHOOKS; j++) {
++ if (!(repl->valid_hooks & (1 << j)))
++ continue;
++ if ( repl->hook_entry[j] <= repl->hook_entry[i] ) {
++ BUGPRINT("Hook order must be followed\n");
++ return -EINVAL;
++ }
++ i = j;
++ }
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_stp.h>
-+#include <linux/module.h>
++ for (i = 0; i < NF_BR_NUMHOOKS; i++)
++ newinfo->hook_entry[i] = NULL;
+
-+#define BPDU_TYPE_CONFIG 0
-+#define BPDU_TYPE_TCN 0x80
++ newinfo->entries_size = repl->entries_size;
++ newinfo->nentries = repl->nentries;
+
-+struct stp_header {
-+ uint8_t dsap;
-+ uint8_t ssap;
-+ uint8_t ctrl;
-+ uint8_t pid;
-+ uint8_t vers;
-+ uint8_t type;
-+};
++ // do some early checkings and initialize some things
++ i = 0; // holds the expected nr. of entries for the chain
++ j = 0; // holds the up to now counted entries for the chain
++ k = 0; // holds the total nr. of entries, should equal
++ // newinfo->nentries afterwards
++ udc_cnt = 0; // will hold the nr. of user defined chains (udc)
++ ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
++ ebt_check_entry_size_and_hooks, newinfo, repl->entries,
++ repl->entries + repl->entries_size, repl->hook_entry, &i, &j, &k,
++ &udc_cnt, repl->valid_hooks);
+
-+struct stp_config_pdu {
-+ uint8_t flags;
-+ uint8_t root[8];
-+ uint8_t root_cost[4];
-+ uint8_t sender[8];
-+ uint8_t port[2];
-+ uint8_t msg_age[2];
-+ uint8_t max_age[2];
-+ uint8_t hello_time[2];
-+ uint8_t forward_delay[2];
-+};
-+
-+#define NR16(p) (p[0] << 8 | p[1])
-+#define NR32(p) ((p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3])
-+
-+static int ebt_filter_config(struct ebt_stp_info *info,
-+ struct stp_config_pdu *stpc)
-+{
-+ struct ebt_stp_config_info *c;
-+ uint16_t v16;
-+ uint32_t v32;
-+ int verdict, i;
++ if (ret != 0)
++ return ret;
+
-+ c = &info->config;
-+ if ((info->bitmask & EBT_STP_FLAGS) &&
-+ FWINV(c->flags != stpc->flags, EBT_STP_FLAGS))
-+ return EBT_NOMATCH;
-+ if (info->bitmask & EBT_STP_ROOTPRIO) {
-+ v16 = NR16(stpc->root);
-+ if (FWINV(v16 < c->root_priol ||
-+ v16 > c->root_priou, EBT_STP_ROOTPRIO))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_ROOTADDR) {
-+ verdict = 0;
-+ for (i = 0; i < 6; i++)
-+ verdict |= (stpc->root[2+i] ^ c->root_addr[i]) &
-+ c->root_addrmsk[i];
-+ if (FWINV(verdict != 0, EBT_STP_ROOTADDR))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_ROOTCOST) {
-+ v32 = NR32(stpc->root_cost);
-+ if (FWINV(v32 < c->root_costl ||
-+ v32 > c->root_costu, EBT_STP_ROOTCOST))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_SENDERPRIO) {
-+ v16 = NR16(stpc->sender);
-+ if (FWINV(v16 < c->sender_priol ||
-+ v16 > c->sender_priou, EBT_STP_SENDERPRIO))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_SENDERADDR) {
-+ verdict = 0;
-+ for (i = 0; i < 6; i++)
-+ verdict |= (stpc->sender[2+i] ^ c->sender_addr[i]) &
-+ c->sender_addrmsk[i];
-+ if (FWINV(verdict != 0, EBT_STP_SENDERADDR))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_PORT) {
-+ v16 = NR16(stpc->port);
-+ if (FWINV(v16 < c->portl ||
-+ v16 > c->portu, EBT_STP_PORT))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_MSGAGE) {
-+ v16 = NR16(stpc->msg_age);
-+ if (FWINV(v16 < c->msg_agel ||
-+ v16 > c->msg_ageu, EBT_STP_MSGAGE))
-+ return EBT_NOMATCH;
-+ }
-+ if (info->bitmask & EBT_STP_MAXAGE) {
-+ v16 = NR16(stpc->max_age);
-+ if (FWINV(v16 < c->max_agel ||
-+ v16 > c->max_ageu, EBT_STP_MAXAGE))
-+ return EBT_NOMATCH;
++ if (i != j) {
++ BUGPRINT("nentries does not equal the nr of entries in the "
++ "(last) chain\n");
++ return -EINVAL;
+ }
-+ if (info->bitmask & EBT_STP_HELLOTIME) {
-+ v16 = NR16(stpc->hello_time);
-+ if (FWINV(v16 < c->hello_timel ||
-+ v16 > c->hello_timeu, EBT_STP_HELLOTIME))
-+ return EBT_NOMATCH;
++ if (k != newinfo->nentries) {
++ BUGPRINT("Total nentries is wrong\n");
++ return -EINVAL;
+ }
-+ if (info->bitmask & EBT_STP_FWDD) {
-+ v16 = NR16(stpc->forward_delay);
-+ if (FWINV(v16 < c->forward_delayl ||
-+ v16 > c->forward_delayu, EBT_STP_FWDD))
-+ return EBT_NOMATCH;
++
++ // check if all valid hooks have a chain
++ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
++ if (newinfo->hook_entry[i] == NULL &&
++ (repl->valid_hooks & (1 << i))) {
++ BUGPRINT("Valid hook without chain\n");
++ return -EINVAL;
++ }
+ }
-+ return EBT_MATCH;
-+}
+
-+static int ebt_filter_stp(const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out, const void *data, unsigned int datalen)
-+{
-+ struct ebt_stp_info *info = (struct ebt_stp_info *)data;
-+ struct stp_header stph;
-+ uint8_t header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
-+ if (skb_copy_bits(skb, 0, &stph, sizeof(stph)))
-+ return EBT_NOMATCH;
++ // Get the location of the udc, put them in an array
++ // While we're at it, allocate the chainstack
++ if (udc_cnt) {
++ // this will get free'd in do_replace()/ebt_register_table()
++ // if an error occurs
++ newinfo->chainstack = (struct ebt_chainstack **)
++ vmalloc(smp_num_cpus * sizeof(struct ebt_chainstack));
++ if (!newinfo->chainstack)
++ return -ENOMEM;
++ for (i = 0; i < smp_num_cpus; i++) {
++ newinfo->chainstack[i] =
++ vmalloc(udc_cnt * sizeof(struct ebt_chainstack));
++ if (!newinfo->chainstack[i]) {
++ while (i)
++ vfree(newinfo->chainstack[--i]);
++ vfree(newinfo->chainstack);
++ newinfo->chainstack = NULL;
++ return -ENOMEM;
++ }
++ }
+
-+ /* The stp code only considers these */
-+ if (memcmp(&stph, header, sizeof(header)))
-+ return EBT_NOMATCH;
++ cl_s = (struct ebt_cl_stack *)
++ vmalloc(udc_cnt * sizeof(struct ebt_cl_stack));
++ if (!cl_s)
++ return -ENOMEM;
++ i = 0; // the i'th udc
++ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
++ ebt_get_udc_positions, newinfo, repl->hook_entry, &i,
++ repl->valid_hooks, cl_s);
++ // sanity check
++ if (i != udc_cnt) {
++ BUGPRINT("i != udc_cnt\n");
++ vfree(cl_s);
++ return -EFAULT;
++ }
++ }
+
-+ if (info->bitmask & EBT_STP_TYPE
-+ && FWINV(info->type != stph.type, EBT_STP_TYPE))
-+ return EBT_NOMATCH;
++ // Check for loops
++ for (i = 0; i < NF_BR_NUMHOOKS; i++)
++ if (repl->valid_hooks & (1 << i))
++ if (check_chainloops(newinfo->hook_entry[i],
++ cl_s, udc_cnt, i, newinfo->entries)) {
++ if (cl_s)
++ vfree(cl_s);
++ return -EINVAL;
++ }
+
-+ if (stph.type == BPDU_TYPE_CONFIG &&
-+ info->bitmask & EBT_STP_CONFIG_MASK) {
-+ struct stp_config_pdu stpc;
++ // we now know the following (along with E=mc²):
++ // - the nr of entries in each chain is right
++ // - the size of the allocated space is right
++ // - all valid hooks have a corresponding chain
++ // - there are no loops
++ // - wrong data can still be on the level of a single entry
++ // - could be there are jumps to places that are not the
++ // beginning of a chain. This can only occur in chains that
++ // are not accessible from any base chains, so we don't care.
+
-+ if (skb_copy_bits(skb, sizeof(stph), &stpc, sizeof(stpc)))
-+ return EBT_NOMATCH;
-+ return ebt_filter_config(info, &stpc);
++ // used to know what we need to clean up if something goes wrong
++ i = 0;
++ ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
++ ebt_check_entry, newinfo, repl->name, &i, repl->valid_hooks,
++ cl_s, udc_cnt);
++ if (ret != 0) {
++ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
++ ebt_cleanup_entry, &i);
+ }
-+ return EBT_MATCH;
++ if (cl_s)
++ vfree(cl_s);
++ return ret;
+}
+
-+static int ebt_stp_check(const char *tablename, unsigned int hookmask,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
++// called under write_lock
++static void get_counters(struct ebt_counter *oldcounters,
++ struct ebt_counter *counters, unsigned int nentries)
+{
-+ struct ebt_stp_info *info = (struct ebt_stp_info *)data;
-+ int len = EBT_ALIGN(sizeof(struct ebt_stp_info));
-+ uint8_t bridge_ula[6] = { 0x01, 0x80, 0xc2, 0x00, 0x00, 0x00 };
-+ uint8_t msk[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
-+
-+ if (info->bitmask & ~EBT_STP_MASK || info->invflags & ~EBT_STP_MASK ||
-+ !(info->bitmask & EBT_STP_MASK))
-+ return -EINVAL;
-+ if (datalen != len)
-+ return -EINVAL;
-+ /* Make sure the match only receives stp frames */
-+ if (memcmp(e->destmac, bridge_ula, ETH_ALEN) ||
-+ memcmp(e->destmsk, msk, ETH_ALEN) || !(e->bitmask & EBT_DESTMAC))
-+ return -EINVAL;
++ int i, cpu;
++ struct ebt_counter *counter_base;
+
-+ return 0;
++ // counters of cpu 0
++ memcpy(counters, oldcounters,
++ sizeof(struct ebt_counter) * nentries);
++ // add other counters to those of cpu 0
++ for (cpu = 1; cpu < smp_num_cpus; cpu++) {
++ counter_base = COUNTER_BASE(oldcounters, nentries, cpu);
++ for (i = 0; i < nentries; i++) {
++ counters[i].pcnt += counter_base[i].pcnt;
++ counters[i].bcnt += counter_base[i].bcnt;
++ }
++ }
+}
+
-+static struct ebt_match filter_stp =
++// replace the table
++static int do_replace(void *user, unsigned int len)
+{
-+ .name = EBT_STP_MATCH,
-+ .match = ebt_filter_stp,
-+ .check = ebt_stp_check,
-+ .me = THIS_MODULE,
-+};
++ int ret, i, countersize;
++ struct ebt_table_info *newinfo;
++ struct ebt_replace tmp;
++ struct ebt_table *t;
++ struct ebt_counter *counterstmp = NULL;
++ // used to be able to unlock earlier
++ struct ebt_table_info *table;
+
-+static int __init init(void)
-+{
-+ return ebt_register_match(&filter_stp);
-+}
++ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
++ return -EFAULT;
+
-+static void __exit fini(void)
-+{
-+ ebt_unregister_match(&filter_stp);
-+}
++ if (len != sizeof(tmp) + tmp.entries_size) {
++ BUGPRINT("Wrong len argument\n");
++ return -EINVAL;
++ }
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebt_vlan.c linux/net/bridge/netfilter/ebt_vlan.c
---- linux.stock/net/bridge/netfilter/ebt_vlan.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebt_vlan.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,259 @@
-+/*
-+ * Description: EBTables 802.1Q match extension kernelspace module.
-+ * Authors: Nick Fedchik <nick@fedchik.org.ua>
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License as published by
-+ * the Free Software Foundation; either version 2 of the License, or
-+ * (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ *
-+ * You should have received a copy of the GNU General Public License
-+ * along with this program; if not, write to the Free Software
-+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-+ */
++ if (tmp.entries_size == 0) {
++ BUGPRINT("Entries_size never zero\n");
++ return -EINVAL;
++ }
++ countersize = COUNTER_OFFSET(tmp.nentries) * smp_num_cpus;
++ newinfo = (struct ebt_table_info *)
++ vmalloc(sizeof(struct ebt_table_info) + countersize);
++ if (!newinfo)
++ return -ENOMEM;
+
-+#include <linux/if_ether.h>
-+#include <linux/if_vlan.h>
-+#include <linux/module.h>
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/netfilter_bridge/ebt_vlan.h>
++ if (countersize)
++ memset(newinfo->counters, 0, countersize);
+
-+static unsigned char debug;
-+#define MODULE_VERSION "0.6"
++ newinfo->entries = (char *)vmalloc(tmp.entries_size);
++ if (!newinfo->entries) {
++ ret = -ENOMEM;
++ goto free_newinfo;
++ }
++ if (copy_from_user(
++ newinfo->entries, tmp.entries, tmp.entries_size) != 0) {
++ BUGPRINT("Couldn't copy entries from userspace\n");
++ ret = -EFAULT;
++ goto free_entries;
++ }
+
-+MODULE_PARM(debug, "0-1b");
-+MODULE_PARM_DESC(debug, "debug=1 is turn on debug messages");
-+MODULE_AUTHOR("Nick Fedchik <nick@fedchik.org.ua>");
-+MODULE_DESCRIPTION("802.1Q match module (ebtables extension), v"
-+ MODULE_VERSION);
-+MODULE_LICENSE("GPL");
++ // the user wants counters back
++ // the check on the size is done later, when we have the lock
++ if (tmp.num_counters) {
++ counterstmp = (struct ebt_counter *)
++ vmalloc(tmp.num_counters * sizeof(struct ebt_counter));
++ if (!counterstmp) {
++ ret = -ENOMEM;
++ goto free_entries;
++ }
++ }
++ else
++ counterstmp = NULL;
+
++ // this can get initialized by translate_table()
++ newinfo->chainstack = NULL;
++ ret = translate_table(&tmp, newinfo);
+
-+#define DEBUG_MSG(args...) if (debug) printk (KERN_DEBUG "ebt_vlan: " args)
-+#define INV_FLAG(_inv_flag_) (info->invflags & _inv_flag_) ? "!" : ""
-+#define GET_BITMASK(_BIT_MASK_) info->bitmask & _BIT_MASK_
-+#define SET_BITMASK(_BIT_MASK_) info->bitmask |= _BIT_MASK_
-+#define EXIT_ON_MISMATCH(_MATCH_,_MASK_) if (!((info->_MATCH_ == _MATCH_)^!!(info->invflags & _MASK_))) return 1;
++ if (ret != 0)
++ goto free_counterstmp;
+
-+/*
-+ * Function description: ebt_filter_vlan() is main engine for
-+ * checking passed 802.1Q frame according to
-+ * the passed extension parameters (in the *data buffer)
-+ * ebt_filter_vlan() is called after successfull check the rule params
-+ * by ebt_check_vlan() function.
-+ * Parameters:
-+ * const struct sk_buff *skb - pointer to passed ethernet frame buffer
-+ * const void *data - pointer to passed extension parameters
-+ * unsigned int datalen - length of passed *data buffer
-+ * const struct net_device *in -
-+ * const struct net_device *out -
-+ * const struct ebt_counter *c -
-+ * Returned values:
-+ * 0 - ok (all rule params matched)
-+ * 1 - miss (rule params not acceptable to the parsed frame)
-+ */
-+static int
-+ebt_filter_vlan(const struct sk_buff *skb,
-+ const struct net_device *in,
-+ const struct net_device *out,
-+ const void *data, unsigned int datalen)
-+{
-+ struct ebt_vlan_info *info = (struct ebt_vlan_info *) data; /* userspace data */
-+ struct vlan_ethhdr *frame = (struct vlan_ethhdr *) skb->mac.raw; /* Passed tagged frame */
++ t = find_table_lock(tmp.name, &ret, &ebt_mutex);
++ if (!t)
++ goto free_iterate;
+
-+ unsigned short TCI; /* Whole TCI, given from parsed frame */
-+ unsigned short id; /* VLAN ID, given from frame TCI */
-+ unsigned char prio; /* user_priority, given from frame TCI */
-+ unsigned short encap; /* VLAN encapsulated Type/Length field, given from orig frame */
++ // the table doesn't like it
++ if (t->check && (ret = t->check(newinfo, tmp.valid_hooks)))
++ goto free_unlock;
+
-+ /*
-+ * Tag Control Information (TCI) consists of the following elements:
-+ * - User_priority. The user_priority field is three bits in length,
-+ * interpreted as a binary number.
-+ * - Canonical Format Indicator (CFI). The Canonical Format Indicator
-+ * (CFI) is a single bit flag value. Currently ignored.
-+ * - VLAN Identifier (VID). The VID is encoded as
-+ * an unsigned binary number.
-+ */
-+ TCI = ntohs(frame->h_vlan_TCI);
-+ id = TCI & VLAN_VID_MASK;
-+ prio = (TCI >> 13) & 0x7;
-+ encap = frame->h_vlan_encapsulated_proto;
++ if (tmp.num_counters && tmp.num_counters != t->private->nentries) {
++ BUGPRINT("Wrong nr. of counters requested\n");
++ ret = -EINVAL;
++ goto free_unlock;
++ }
+
-+ /*
-+ * Checking VLAN Identifier (VID)
-+ */
-+ if (GET_BITMASK(EBT_VLAN_ID)) { /* Is VLAN ID parsed? */
-+ EXIT_ON_MISMATCH(id, EBT_VLAN_ID);
++ // we have the mutex lock, so no danger in reading this pointer
++ table = t->private;
++ // we need an atomic snapshot of the counters
++ write_lock_bh(&t->lock);
++ if (tmp.num_counters)
++ get_counters(t->private->counters, counterstmp,
++ t->private->nentries);
++
++ t->private = newinfo;
++ write_unlock_bh(&t->lock);
++ up(&ebt_mutex);
++ // So, a user can change the chains while having messed up her counter
++ // allocation. Only reason why this is done is because this way the lock
++ // is held only once, while this doesn't bring the kernel into a
++ // dangerous state.
++ if (tmp.num_counters &&
++ copy_to_user(tmp.counters, counterstmp,
++ tmp.num_counters * sizeof(struct ebt_counter))) {
++ BUGPRINT("Couldn't copy counters to userspace\n");
++ ret = -EFAULT;
+ }
-+ /*
-+ * Checking user_priority
-+ */
-+ if (GET_BITMASK(EBT_VLAN_PRIO)) { /* Is VLAN user_priority parsed? */
-+ EXIT_ON_MISMATCH(prio, EBT_VLAN_PRIO);
++ else
++ ret = 0;
++
++ // decrease module count and free resources
++ EBT_ENTRY_ITERATE(table->entries, table->entries_size,
++ ebt_cleanup_entry, NULL);
++
++ vfree(table->entries);
++ if (table->chainstack) {
++ for (i = 0; i < smp_num_cpus; i++)
++ vfree(table->chainstack[i]);
++ vfree(table->chainstack);
+ }
-+ /*
-+ * Checking Encapsulated Proto (Length/Type) field
-+ */
-+ if (GET_BITMASK(EBT_VLAN_ENCAP)) { /* Is VLAN Encap parsed? */
-+ EXIT_ON_MISMATCH(encap, EBT_VLAN_ENCAP);
++ vfree(table);
++
++ if (counterstmp)
++ vfree(counterstmp);
++ return ret;
++
++free_unlock:
++ up(&ebt_mutex);
++free_iterate:
++ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
++ ebt_cleanup_entry, NULL);
++free_counterstmp:
++ if (counterstmp)
++ vfree(counterstmp);
++ // can be initialized in translate_table()
++ if (newinfo->chainstack) {
++ for (i = 0; i < smp_num_cpus; i++)
++ vfree(newinfo->chainstack[i]);
++ vfree(newinfo->chainstack);
+ }
-+ /*
-+ * All possible extension parameters was parsed.
-+ * If rule never returned by missmatch, then all ok.
-+ */
-+ return 0;
++free_entries:
++ if (newinfo->entries)
++ vfree(newinfo->entries);
++free_newinfo:
++ if (newinfo)
++ vfree(newinfo);
++ return ret;
+}
+
-+/*
-+ * Function description: ebt_vlan_check() is called when userspace
-+ * delivers the table entry to the kernel,
-+ * and to check that userspace doesn't give a bad table.
-+ * Parameters:
-+ * const char *tablename - table name string
-+ * unsigned int hooknr - hook number
-+ * const struct ebt_entry *e - ebtables entry basic set
-+ * const void *data - pointer to passed extension parameters
-+ * unsigned int datalen - length of passed *data buffer
-+ * Returned values:
-+ * 0 - ok (all delivered rule params are correct)
-+ * 1 - miss (rule params is out of range, invalid, incompatible, etc.)
-+ */
-+static int
-+ebt_check_vlan(const char *tablename,
-+ unsigned int hooknr,
-+ const struct ebt_entry *e, void *data, unsigned int datalen)
++int ebt_register_target(struct ebt_target *target)
+{
-+ struct ebt_vlan_info *info = (struct ebt_vlan_info *) data;
++ int ret;
+
-+ /*
-+ * Parameters buffer overflow check
-+ */
-+ if (datalen != EBT_ALIGN(sizeof(struct ebt_vlan_info))) {
-+ DEBUG_MSG
-+ ("passed size %d is not eq to ebt_vlan_info (%d)\n",
-+ datalen, sizeof(struct ebt_vlan_info));
-+ return -EINVAL;
++ ret = down_interruptible(&ebt_mutex);
++ if (ret != 0)
++ return ret;
++ if (!list_named_insert(&ebt_targets, target)) {
++ up(&ebt_mutex);
++ return -EEXIST;
+ }
++ up(&ebt_mutex);
++ MOD_INC_USE_COUNT;
+
-+ /*
-+ * Is it 802.1Q frame checked?
-+ */
-+ if (e->ethproto != __constant_htons(ETH_P_8021Q)) {
-+ DEBUG_MSG
-+ ("passed entry proto %2.4X is not 802.1Q (8100)\n",
-+ (unsigned short) ntohs(e->ethproto));
-+ return -EINVAL;
-+ }
++ return 0;
++}
+
-+ /*
-+ * Check for bitmask range
-+ * True if even one bit is out of mask
-+ */
-+ if (info->bitmask & ~EBT_VLAN_MASK) {
-+ DEBUG_MSG("bitmask %2X is out of mask (%2X)\n",
-+ info->bitmask, EBT_VLAN_MASK);
-+ return -EINVAL;
-+ }
-+
-+ /*
-+ * Check for inversion flags range
-+ */
-+ if (info->invflags & ~EBT_VLAN_MASK) {
-+ DEBUG_MSG("inversion flags %2X is out of mask (%2X)\n",
-+ info->invflags, EBT_VLAN_MASK);
-+ return -EINVAL;
-+ }
++void ebt_unregister_target(struct ebt_target *target)
++{
++ down(&ebt_mutex);
++ LIST_DELETE(&ebt_targets, target);
++ up(&ebt_mutex);
++ MOD_DEC_USE_COUNT;
++}
+
-+ /*
-+ * Reserved VLAN ID (VID) values
-+ * -----------------------------
-+ * 0 - The null VLAN ID.
-+ * 1 - The default Port VID (PVID)
-+ * 0x0FFF - Reserved for implementation use.
-+ * if_vlan.h: VLAN_GROUP_ARRAY_LEN 4096.
-+ */
-+ if (GET_BITMASK(EBT_VLAN_ID)) { /* when vlan-id param was spec-ed */
-+ if (!!info->id) { /* if id!=0 => check vid range */
-+ if (info->id > VLAN_GROUP_ARRAY_LEN) {
-+ DEBUG_MSG
-+ ("id %d is out of range (1-4096)\n",
-+ info->id);
-+ return -EINVAL;
-+ }
-+ /*
-+ * Note: This is valid VLAN-tagged frame point.
-+ * Any value of user_priority are acceptable,
-+ * but should be ignored according to 802.1Q Std.
-+ * So we just drop the prio flag.
-+ */
-+ info->bitmask &= ~EBT_VLAN_PRIO;
-+ }
-+ /*
-+ * Else, id=0 (null VLAN ID) => user_priority range (any?)
-+ */
-+ }
++int ebt_register_match(struct ebt_match *match)
++{
++ int ret;
+
-+ if (GET_BITMASK(EBT_VLAN_PRIO)) {
-+ if ((unsigned char) info->prio > 7) {
-+ DEBUG_MSG
-+ ("prio %d is out of range (0-7)\n",
-+ info->prio);
-+ return -EINVAL;
-+ }
-+ }
-+ /*
-+ * Check for encapsulated proto range - it is possible to be
-+ * any value for u_short range.
-+ * if_ether.h: ETH_ZLEN 60 - Min. octets in frame sans FCS
-+ */
-+ if (GET_BITMASK(EBT_VLAN_ENCAP)) {
-+ if ((unsigned short) ntohs(info->encap) < ETH_ZLEN) {
-+ DEBUG_MSG
-+ ("encap frame length %d is less than minimal\n",
-+ ntohs(info->encap));
-+ return -EINVAL;
-+ }
++ ret = down_interruptible(&ebt_mutex);
++ if (ret != 0)
++ return ret;
++ if (!list_named_insert(&ebt_matches, match)) {
++ up(&ebt_mutex);
++ return -EEXIST;
+ }
++ up(&ebt_mutex);
++ MOD_INC_USE_COUNT;
+
+ return 0;
+}
+
-+static struct ebt_match filter_vlan = {
-+ {NULL, NULL},
-+ EBT_VLAN_MATCH,
-+ ebt_filter_vlan,
-+ ebt_check_vlan,
-+ NULL,
-+ THIS_MODULE
-+};
++void ebt_unregister_match(struct ebt_match *match)
++{
++ down(&ebt_mutex);
++ LIST_DELETE(&ebt_matches, match);
++ up(&ebt_mutex);
++ MOD_DEC_USE_COUNT;
++}
+
-+/*
-+ * Module initialization function.
-+ */
-+static int __init init(void)
++int ebt_register_watcher(struct ebt_watcher *watcher)
+{
-+ DEBUG_MSG("ebtables 802.1Q extension module v"
-+ MODULE_VERSION "\n");
-+ DEBUG_MSG("module debug=%d\n", !!debug);
-+ return ebt_register_match(&filter_vlan);
++ int ret;
++
++ ret = down_interruptible(&ebt_mutex);
++ if (ret != 0)
++ return ret;
++ if (!list_named_insert(&ebt_watchers, watcher)) {
++ up(&ebt_mutex);
++ return -EEXIST;
++ }
++ up(&ebt_mutex);
++ MOD_INC_USE_COUNT;
++
++ return 0;
+}
+
-+/*
-+ * Module "finalization" function
-+ */
-+static void __exit fini(void)
++void ebt_unregister_watcher(struct ebt_watcher *watcher)
+{
-+ ebt_unregister_match(&filter_vlan);
++ down(&ebt_mutex);
++ LIST_DELETE(&ebt_watchers, watcher);
++ up(&ebt_mutex);
++ MOD_DEC_USE_COUNT;
+}
+
-+module_init(init);
-+module_exit(fini);
++int ebt_register_table(struct ebt_table *table)
++{
++ struct ebt_table_info *newinfo;
++ int ret, i, countersize;
+
-+EXPORT_NO_SYMBOLS;
-diff -Nurb linux.stock/net/bridge/netfilter/ebtable_broute.c linux/net/bridge/netfilter/ebtable_broute.c
---- linux.stock/net/bridge/netfilter/ebtable_broute.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebtable_broute.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,79 @@
-+/*
-+ * ebtable_broute
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * April, 2002
-+ *
-+ * This table lets you choose between routing and bridging for frames
-+ * entering on a bridge enslaved nic. This table is traversed before any
-+ * other ebtables table. See net/bridge/br_input.c.
-+ */
++ if (!table || !table->table ||!table->table->entries ||
++ table->table->entries_size == 0 ||
++ table->table->counters || table->private) {
++ BUGPRINT("Bad table data for ebt_register_table!!!\n");
++ return -EINVAL;
++ }
+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/module.h>
-+#include <linux/if_bridge.h>
-+#include <linux/brlock.h>
++ countersize = COUNTER_OFFSET(table->table->nentries) * smp_num_cpus;
++ newinfo = (struct ebt_table_info *)
++ vmalloc(sizeof(struct ebt_table_info) + countersize);
++ ret = -ENOMEM;
++ if (!newinfo)
++ return -ENOMEM;
+
-+// EBT_ACCEPT means the frame will be bridged
-+// EBT_DROP means the frame will be routed
-+static struct ebt_entries initial_chain =
-+ {0, "BROUTING", 0, EBT_ACCEPT, 0};
++ newinfo->entries = (char *)vmalloc(table->table->entries_size);
++ if (!(newinfo->entries))
++ goto free_newinfo;
+
-+static struct ebt_replace initial_table =
-+{
-+ "broute", 1 << NF_BR_BROUTING, 0, sizeof(struct ebt_entries),
-+ { [NF_BR_BROUTING]&initial_chain}, 0, NULL, (char *)&initial_chain
-+};
++ memcpy(newinfo->entries, table->table->entries,
++ table->table->entries_size);
+
-+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
-+{
-+ if (valid_hooks & ~(1 << NF_BR_BROUTING))
-+ return -EINVAL;
-+ return 0;
-+}
++ if (countersize)
++ memset(newinfo->counters, 0, countersize);
+
-+static struct ebt_table broute_table =
-+{
-+ {NULL, NULL}, "broute", &initial_table, 1 << NF_BR_BROUTING,
-+ RW_LOCK_UNLOCKED, check, NULL
-+};
++ // fill in newinfo and parse the entries
++ newinfo->chainstack = NULL;
++ ret = translate_table(table->table, newinfo);
++ if (ret != 0) {
++ BUGPRINT("Translate_table failed\n");
++ goto free_chainstack;
++ }
+
-+static int ebt_broute(struct sk_buff **pskb)
-+{
-+ int ret;
++ if (table->check && table->check(newinfo, table->valid_hooks)) {
++ BUGPRINT("The table doesn't like its own initial data, lol\n");
++ return -EINVAL;
++ }
+
-+ ret = ebt_do_table(NF_BR_BROUTING, pskb, (*pskb)->dev, NULL,
-+ &broute_table);
-+ if (ret == NF_DROP)
-+ return 1; // route it
-+ return 0; // bridge it
-+}
++ table->private = newinfo;
++ table->lock = RW_LOCK_UNLOCKED;
++ ret = down_interruptible(&ebt_mutex);
++ if (ret != 0)
++ goto free_chainstack;
+
-+static int __init init(void)
-+{
-+ int ret;
++ if (list_named_find(&ebt_tables, table->name)) {
++ ret = -EEXIST;
++ BUGPRINT("Table name already exists\n");
++ goto free_unlock;
++ }
+
-+ ret = ebt_register_table(&broute_table);
-+ if (ret < 0)
-+ return ret;
-+ br_write_lock_bh(BR_NETPROTO_LOCK);
-+ // see br_input.c
-+ br_should_route_hook = ebt_broute;
-+ br_write_unlock_bh(BR_NETPROTO_LOCK);
++ list_prepend(&ebt_tables, table);
++ up(&ebt_mutex);
++ MOD_INC_USE_COUNT;
++ return 0;
++free_unlock:
++ up(&ebt_mutex);
++free_chainstack:
++ if (newinfo->chainstack) {
++ for (i = 0; i < smp_num_cpus; i++)
++ vfree(newinfo->chainstack[i]);
++ vfree(newinfo->chainstack);
++ }
++ vfree(newinfo->entries);
++free_newinfo:
++ vfree(newinfo);
+ return ret;
+}
+
-+static void __exit fini(void)
++void ebt_unregister_table(struct ebt_table *table)
+{
-+ br_write_lock_bh(BR_NETPROTO_LOCK);
-+ br_should_route_hook = NULL;
-+ br_write_unlock_bh(BR_NETPROTO_LOCK);
-+ ebt_unregister_table(&broute_table);
-+}
++ int i;
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebtable_filter.c linux/net/bridge/netfilter/ebtable_filter.c
---- linux.stock/net/bridge/netfilter/ebtable_filter.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebtable_filter.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,90 @@
-+/*
-+ * ebtable_filter
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * April, 2002
-+ *
-+ */
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/module.h>
-+
-+#define FILTER_VALID_HOOKS ((1 << NF_BR_LOCAL_IN) | (1 << NF_BR_FORWARD) | \
-+ (1 << NF_BR_LOCAL_OUT))
++ if (!table) {
++ BUGPRINT("Request to unregister NULL table!!!\n");
++ return;
++ }
++ down(&ebt_mutex);
++ LIST_DELETE(&ebt_tables, table);
++ up(&ebt_mutex);
++ EBT_ENTRY_ITERATE(table->private->entries,
++ table->private->entries_size, ebt_cleanup_entry, NULL);
++ if (table->private->entries)
++ vfree(table->private->entries);
++ if (table->private->chainstack) {
++ for (i = 0; i < smp_num_cpus; i++)
++ vfree(table->private->chainstack[i]);
++ vfree(table->private->chainstack);
++ }
++ vfree(table->private);
++ MOD_DEC_USE_COUNT;
++}
+
-+static struct ebt_entries initial_chains[] =
++// userspace just supplied us with counters
++static int update_counters(void *user, unsigned int len)
+{
-+ {0, "INPUT", 0, EBT_ACCEPT, 0},
-+ {0, "FORWARD", 0, EBT_ACCEPT, 0},
-+ {0, "OUTPUT", 0, EBT_ACCEPT, 0}
-+};
++ int i, ret;
++ struct ebt_counter *tmp;
++ struct ebt_replace hlp;
++ struct ebt_table *t;
+
-+static struct ebt_replace initial_table =
-+{
-+ "filter", FILTER_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
-+ { [NF_BR_LOCAL_IN]&initial_chains[0], [NF_BR_FORWARD]&initial_chains[1],
-+ [NF_BR_LOCAL_OUT]&initial_chains[2] }, 0, NULL, (char *)initial_chains
-+};
++ if (copy_from_user(&hlp, user, sizeof(hlp)))
++ return -EFAULT;
+
-+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
-+{
-+ if (valid_hooks & ~FILTER_VALID_HOOKS)
++ if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
++ return -EINVAL;
++ if (hlp.num_counters == 0)
+ return -EINVAL;
-+ return 0;
-+}
+
-+static struct ebt_table frame_filter =
-+{
-+ {NULL, NULL}, "filter", &initial_table, FILTER_VALID_HOOKS,
-+ RW_LOCK_UNLOCKED, check, NULL
-+};
++ if ( !(tmp = (struct ebt_counter *)
++ vmalloc(hlp.num_counters * sizeof(struct ebt_counter))) ){
++ MEMPRINT("Update_counters && nomemory\n");
++ return -ENOMEM;
++ }
+
-+static unsigned int
-+ebt_hook (unsigned int hook, struct sk_buff **pskb, const struct net_device *in,
-+ const struct net_device *out, int (*okfn)(struct sk_buff *))
-+{
-+ return ebt_do_table(hook, pskb, in, out, &frame_filter);
-+}
++ t = find_table_lock(hlp.name, &ret, &ebt_mutex);
++ if (!t)
++ goto free_tmp;
+
-+static struct nf_hook_ops ebt_ops_filter[] = {
-+ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_IN,
-+ NF_BR_PRI_FILTER_BRIDGED},
-+ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_FORWARD,
-+ NF_BR_PRI_FILTER_BRIDGED},
-+ { { NULL, NULL }, ebt_hook, PF_BRIDGE, NF_BR_LOCAL_OUT,
-+ NF_BR_PRI_FILTER_OTHER}
-+};
++ if (hlp.num_counters != t->private->nentries) {
++ BUGPRINT("Wrong nr of counters\n");
++ ret = -EINVAL;
++ goto unlock_mutex;
++ }
+
-+static int __init init(void)
-+{
-+ int i, j, ret;
++ if ( copy_from_user(tmp, hlp.counters,
++ hlp.num_counters * sizeof(struct ebt_counter)) ) {
++ BUGPRINT("Updata_counters && !cfu\n");
++ ret = -EFAULT;
++ goto unlock_mutex;
++ }
+
-+ ret = ebt_register_table(&frame_filter);
-+ if (ret < 0)
-+ return ret;
-+ for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
-+ if ((ret = nf_register_hook(&ebt_ops_filter[i])) < 0)
-+ goto cleanup;
-+ return ret;
-+cleanup:
-+ for (j = 0; j < i; j++)
-+ nf_unregister_hook(&ebt_ops_filter[j]);
-+ ebt_unregister_table(&frame_filter);
-+ return ret;
-+}
++ // we want an atomic add of the counters
++ write_lock_bh(&t->lock);
+
-+static void __exit fini(void)
-+{
-+ int i;
++ // we add to the counters of the first cpu
++ for (i = 0; i < hlp.num_counters; i++) {
++ t->private->counters[i].pcnt += tmp[i].pcnt;
++ t->private->counters[i].bcnt += tmp[i].bcnt;
++ }
+
-+ for (i = 0; i < sizeof(ebt_ops_filter) / sizeof(ebt_ops_filter[0]); i++)
-+ nf_unregister_hook(&ebt_ops_filter[i]);
-+ ebt_unregister_table(&frame_filter);
++ write_unlock_bh(&t->lock);
++ ret = 0;
++unlock_mutex:
++ up(&ebt_mutex);
++free_tmp:
++ vfree(tmp);
++ return ret;
+}
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebtable_nat.c linux/net/bridge/netfilter/ebtable_nat.c
---- linux.stock/net/bridge/netfilter/ebtable_nat.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebtable_nat.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,96 @@
-+/*
-+ * ebtable_nat
-+ *
-+ * Authors:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * April, 2002
-+ *
-+ */
-+
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/module.h>
-+#define NAT_VALID_HOOKS ((1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_LOCAL_OUT) | \
-+ (1 << NF_BR_POST_ROUTING))
-+
-+static struct ebt_entries initial_chains[] =
-+{
-+ {0, "PREROUTING", 0, EBT_ACCEPT, 0},
-+ {0, "OUTPUT", 0, EBT_ACCEPT, 0},
-+ {0, "POSTROUTING", 0, EBT_ACCEPT, 0}
-+};
-+
-+static struct ebt_replace initial_table =
-+{
-+ "nat", NAT_VALID_HOOKS, 0, 3 * sizeof(struct ebt_entries),
-+ { [NF_BR_PRE_ROUTING]&initial_chains[0], [NF_BR_LOCAL_OUT]&initial_chains[1],
-+ [NF_BR_POST_ROUTING]&initial_chains[2] }, 0, NULL, (char *)initial_chains
-+};
-+
-+static int check(const struct ebt_table_info *info, unsigned int valid_hooks)
++static inline int ebt_make_matchname(struct ebt_entry_match *m,
++ char *base, char *ubase)
+{
-+ if (valid_hooks & ~NAT_VALID_HOOKS)
-+ return -EINVAL;
++ char *hlp = ubase - base + (char *)m;
++ if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN))
++ return -EFAULT;
+ return 0;
+}
+
-+static struct ebt_table frame_nat =
-+{
-+ {NULL, NULL}, "nat", &initial_table, NAT_VALID_HOOKS,
-+ RW_LOCK_UNLOCKED, check, NULL
-+};
-+
-+static unsigned int
-+ebt_nat_dst(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
-+ , const struct net_device *out, int (*okfn)(struct sk_buff *))
++static inline int ebt_make_watchername(struct ebt_entry_watcher *w,
++ char *base, char *ubase)
+{
-+ return ebt_do_table(hook, pskb, in, out, &frame_nat);
++ char *hlp = ubase - base + (char *)w;
++ if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN))
++ return -EFAULT;
++ return 0;
+}
+
-+static unsigned int
-+ebt_nat_src(unsigned int hook, struct sk_buff **pskb, const struct net_device *in
-+ , const struct net_device *out, int (*okfn)(struct sk_buff *))
++static inline int ebt_make_names(struct ebt_entry *e, char *base, char *ubase)
+{
-+ return ebt_do_table(hook, pskb, in, out, &frame_nat);
-+}
-+
-+static struct nf_hook_ops ebt_ops_nat[] = {
-+ { { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_LOCAL_OUT,
-+ NF_BR_PRI_NAT_DST_OTHER},
-+ { { NULL, NULL }, ebt_nat_src, PF_BRIDGE, NF_BR_POST_ROUTING,
-+ NF_BR_PRI_NAT_SRC},
-+ { { NULL, NULL }, ebt_nat_dst, PF_BRIDGE, NF_BR_PRE_ROUTING,
-+ NF_BR_PRI_NAT_DST_BRIDGED},
-+};
++ int ret;
++ char *hlp;
++ struct ebt_entry_target *t;
+
-+static int __init init(void)
-+{
-+ int i, ret, j;
++ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
++ return 0;
+
-+ ret = ebt_register_table(&frame_nat);
-+ if (ret < 0)
++ hlp = ubase - base + (char *)e + e->target_offset;
++ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
++
++ ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase);
++ if (ret != 0)
+ return ret;
-+ for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
-+ if ((ret = nf_register_hook(&ebt_ops_nat[i])) < 0)
-+ goto cleanup;
-+ return ret;
-+cleanup:
-+ for (j = 0; j < i; j++)
-+ nf_unregister_hook(&ebt_ops_nat[j]);
-+ ebt_unregister_table(&frame_nat);
-+ return ret;
++ ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
++ if (ret != 0)
++ return ret;
++ if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN))
++ return -EFAULT;
++ return 0;
+}
+
-+static void __exit fini(void)
++// called with ebt_mutex down
++static int copy_everything_to_user(struct ebt_table *t, void *user,
++ int *len, int cmd)
+{
-+ int i;
-+
-+ for (i = 0; i < sizeof(ebt_ops_nat) / sizeof(ebt_ops_nat[0]); i++)
-+ nf_unregister_hook(&ebt_ops_nat[i]);
-+ ebt_unregister_table(&frame_nat);
-+}
++ struct ebt_replace tmp;
++ struct ebt_counter *counterstmp, *oldcounters;
++ unsigned int entries_size, nentries;
++ char *entries;
+
-+module_init(init);
-+module_exit(fini);
-+EXPORT_NO_SYMBOLS;
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/bridge/netfilter/ebtables.c linux/net/bridge/netfilter/ebtables.c
---- linux.stock/net/bridge/netfilter/ebtables.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/bridge/netfilter/ebtables.c 2004-07-10 23:46:39.000000000 -0400
-@@ -0,0 +1,1490 @@
-+/*
-+ * ebtables
-+ *
-+ * Author:
-+ * Bart De Schuymer <bart.de.schuymer@pandora.be>
-+ *
-+ * ebtables.c,v 2.0, July, 2002
-+ *
-+ * This code is stongly inspired on the iptables code which is
-+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version
-+ * 2 of the License, or (at your option) any later version.
-+ */
++ if (cmd == EBT_SO_GET_ENTRIES) {
++ entries_size = t->private->entries_size;
++ nentries = t->private->nentries;
++ entries = t->private->entries;
++ oldcounters = t->private->counters;
++ } else {
++ entries_size = t->table->entries_size;
++ nentries = t->table->nentries;
++ entries = t->table->entries;
++ oldcounters = t->table->counters;
++ }
+
-+// used for print_string
-+#include <linux/sched.h>
-+#include <linux/tty.h>
++ if (copy_from_user(&tmp, user, sizeof(tmp))) {
++ BUGPRINT("Cfu didn't work\n");
++ return -EFAULT;
++ }
+
-+#include <linux/kmod.h>
-+#include <linux/module.h>
-+#include <linux/vmalloc.h>
-+#include <linux/netfilter_bridge/ebtables.h>
-+#include <linux/spinlock.h>
-+#include <asm/uaccess.h>
-+#include <linux/smp.h>
-+#include <net/sock.h>
-+// needed for logical [in,out]-dev filtering
-+#include "../br_private.h"
++ if (*len != sizeof(struct ebt_replace) + entries_size +
++ (tmp.num_counters? nentries * sizeof(struct ebt_counter): 0)) {
++ BUGPRINT("Wrong size\n");
++ return -EINVAL;
++ }
+
-+// list_named_find
-+#define ASSERT_READ_LOCK(x)
-+#define ASSERT_WRITE_LOCK(x)
-+#include <linux/netfilter_ipv4/listhelp.h>
++ if (tmp.nentries != nentries) {
++ BUGPRINT("Nentries wrong\n");
++ return -EINVAL;
++ }
+
-+#if 0 // use this for remote debugging
-+// Copyright (C) 1998 by Ori Pomerantz
-+// Print the string to the appropriate tty, the one
-+// the current task uses
-+static void print_string(char *str)
-+{
-+ struct tty_struct *my_tty;
++ if (tmp.entries_size != entries_size) {
++ BUGPRINT("Wrong size\n");
++ return -EINVAL;
++ }
+
-+ /* The tty for the current task */
-+ my_tty = current->tty;
-+ if (my_tty != NULL) {
-+ (*(my_tty->driver).write)(my_tty, 0, str, strlen(str));
-+ (*(my_tty->driver).write)(my_tty, 0, "\015\012", 2);
++ // userspace might not need the counters
++ if (tmp.num_counters) {
++ if (tmp.num_counters != nentries) {
++ BUGPRINT("Num_counters wrong\n");
++ return -EINVAL;
++ }
++ counterstmp = (struct ebt_counter *)
++ vmalloc(nentries * sizeof(struct ebt_counter));
++ if (!counterstmp) {
++ MEMPRINT("Couldn't copy counters, out of memory\n");
++ return -ENOMEM;
++ }
++ write_lock_bh(&t->lock);
++ get_counters(oldcounters, counterstmp, nentries);
++ write_unlock_bh(&t->lock);
++
++ if (copy_to_user(tmp.counters, counterstmp,
++ nentries * sizeof(struct ebt_counter))) {
++ BUGPRINT("Couldn't copy counters to userspace\n");
++ vfree(counterstmp);
++ return -EFAULT;
++ }
++ vfree(counterstmp);
++ }
++
++ if (copy_to_user(tmp.entries, entries, entries_size)) {
++ BUGPRINT("Couldn't copy entries to userspace\n");
++ return -EFAULT;
+ }
++ // set the match/watcher/target names right
++ return EBT_ENTRY_ITERATE(entries, entries_size,
++ ebt_make_names, entries, tmp.entries);
+}
+
-+#define BUGPRINT(args) print_string(args);
-+#else
-+#define BUGPRINT(format, args...) printk("kernel msg: ebtables bug: please "\
-+ "report to author: "format, ## args)
-+// #define BUGPRINT(format, args...)
-+#endif
-+#define MEMPRINT(format, args...) printk("kernel msg: ebtables "\
-+ ": out of memory: "format, ## args)
-+// #define MEMPRINT(format, args...)
++static int do_ebt_set_ctl(struct sock *sk,
++ int cmd, void *user, unsigned int len)
++{
++ int ret;
++
++ switch(cmd) {
++ case EBT_SO_SET_ENTRIES:
++ ret = do_replace(user, len);
++ break;
++ case EBT_SO_SET_COUNTERS:
++ ret = update_counters(user, len);
++ break;
++ default:
++ ret = -EINVAL;
++ }
++ return ret;
++}
+
++static int do_ebt_get_ctl(struct sock *sk, int cmd, void *user, int *len)
++{
++ int ret;
++ struct ebt_replace tmp;
++ struct ebt_table *t;
+
++ if (copy_from_user(&tmp, user, sizeof(tmp)))
++ return -EFAULT;
+
-+// Each cpu has its own set of counters, so there is no need for write_lock in
-+// the softirq
-+// For reading or updating the counters, the user context needs to
-+// get a write_lock
++ t = find_table_lock(tmp.name, &ret, &ebt_mutex);
++ if (!t)
++ return ret;
+
-+// The size of each set of counters is altered to get cache alignment
-+#define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
-+#define COUNTER_OFFSET(n) (SMP_ALIGN(n * sizeof(struct ebt_counter)))
-+#define COUNTER_BASE(c, n, cpu) ((struct ebt_counter *)(((char *)c) + \
-+ COUNTER_OFFSET(n) * cpu))
++ switch(cmd) {
++ case EBT_SO_GET_INFO:
++ case EBT_SO_GET_INIT_INFO:
++ if (*len != sizeof(struct ebt_replace)){
++ ret = -EINVAL;
++ up(&ebt_mutex);
++ break;
++ }
++ if (cmd == EBT_SO_GET_INFO) {
++ tmp.nentries = t->private->nentries;
++ tmp.entries_size = t->private->entries_size;
++ tmp.valid_hooks = t->valid_hooks;
++ } else {
++ tmp.nentries = t->table->nentries;
++ tmp.entries_size = t->table->entries_size;
++ tmp.valid_hooks = t->table->valid_hooks;
++ }
++ up(&ebt_mutex);
++ if (copy_to_user(user, &tmp, *len) != 0){
++ BUGPRINT("c2u Didn't work\n");
++ ret = -EFAULT;
++ break;
++ }
++ ret = 0;
++ break;
+
++ case EBT_SO_GET_ENTRIES:
++ case EBT_SO_GET_INIT_ENTRIES:
++ ret = copy_everything_to_user(t, user, len, cmd);
++ up(&ebt_mutex);
++ break;
+
++ default:
++ up(&ebt_mutex);
++ ret = -EINVAL;
++ }
+
-+static DECLARE_MUTEX(ebt_mutex);
-+static LIST_HEAD(ebt_tables);
-+static LIST_HEAD(ebt_targets);
-+static LIST_HEAD(ebt_matches);
-+static LIST_HEAD(ebt_watchers);
++ return ret;
++}
+
-+static struct ebt_target ebt_standard_target =
-+{ {NULL, NULL}, EBT_STANDARD_TARGET, NULL, NULL, NULL, NULL};
++static struct nf_sockopt_ops ebt_sockopts =
++{ { NULL, NULL }, PF_INET, EBT_BASE_CTL, EBT_SO_SET_MAX + 1, do_ebt_set_ctl,
++ EBT_BASE_CTL, EBT_SO_GET_MAX + 1, do_ebt_get_ctl, 0, NULL
++};
+
-+static inline int ebt_do_watcher (struct ebt_entry_watcher *w,
-+ const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out)
++static int __init init(void)
+{
-+ w->u.watcher->watcher(skb, in, out, w->data,
-+ w->watcher_size);
-+ // watchers don't give a verdict
++ int ret;
++
++ down(&ebt_mutex);
++ list_named_insert(&ebt_targets, &ebt_standard_target);
++ up(&ebt_mutex);
++ if ((ret = nf_register_sockopt(&ebt_sockopts)) < 0)
++ return ret;
++
++ printk(KERN_NOTICE "Ebtables v2.0 registered\n");
+ return 0;
+}
+
-+static inline int ebt_do_match (struct ebt_entry_match *m,
-+ const struct sk_buff *skb, const struct net_device *in,
-+ const struct net_device *out)
++static void __exit fini(void)
+{
-+ return m->u.match->match(skb, in, out, m->data,
-+ m->match_size);
++ nf_unregister_sockopt(&ebt_sockopts);
++ printk(KERN_NOTICE "Ebtables v2.0 unregistered\n");
+}
+
-+static inline int ebt_dev_check(char *entry, const struct net_device *device)
-+{
-+ if (*entry == '\0')
-+ return 0;
-+ if (!device)
-+ return 1;
-+ return !!strcmp(entry, device->name);
-+}
++EXPORT_SYMBOL(ebt_register_table);
++EXPORT_SYMBOL(ebt_unregister_table);
++EXPORT_SYMBOL(ebt_register_match);
++EXPORT_SYMBOL(ebt_unregister_match);
++EXPORT_SYMBOL(ebt_register_watcher);
++EXPORT_SYMBOL(ebt_unregister_watcher);
++EXPORT_SYMBOL(ebt_register_target);
++EXPORT_SYMBOL(ebt_unregister_target);
++EXPORT_SYMBOL(ebt_do_table);
++module_init(init);
++module_exit(fini);
++MODULE_LICENSE("GPL");
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebtables.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,361 @@
++/*
++ * ebtables
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * ebtables.c,v 2.0, September, 2002
++ *
++ * This code is stongly inspired on the iptables code which is
++ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
++ */
+
-+#define FWINV2(bool,invflg) ((bool) ^ !!(e->invflags & invflg))
-+// process standard matches
-+static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h,
-+ const struct net_device *in, const struct net_device *out)
-+{
-+ int verdict, i;
-+
-+ if (e->bitmask & EBT_802_3) {
-+ if (FWINV2(ntohs(h->h_proto) >= 1536, EBT_IPROTO))
-+ return 1;
-+ } else if (!(e->bitmask & EBT_NOPROTO) &&
-+ FWINV2(e->ethproto != h->h_proto, EBT_IPROTO))
-+ return 1;
++#ifndef __LINUX_BRIDGE_EFF_H
++#define __LINUX_BRIDGE_EFF_H
++#include <linux/if.h>
++#include <linux/netfilter_bridge.h>
++#include <linux/if_ether.h>
+
-+ if (FWINV2(ebt_dev_check(e->in, in), EBT_IIN))
-+ return 1;
-+ if (FWINV2(ebt_dev_check(e->out, out), EBT_IOUT))
-+ return 1;
-+ if ((!in || !in->br_port) ? 0 : FWINV2(ebt_dev_check(
-+ e->logical_in, &in->br_port->br->dev), EBT_ILOGICALIN))
-+ return 1;
-+ if ((!out || !out->br_port) ? 0 : FWINV2(ebt_dev_check(
-+ e->logical_out, &out->br_port->br->dev), EBT_ILOGICALOUT))
-+ return 1;
++#define EBT_TABLE_MAXNAMELEN 32
++#define EBT_CHAIN_MAXNAMELEN EBT_TABLE_MAXNAMELEN
++#define EBT_FUNCTION_MAXNAMELEN EBT_TABLE_MAXNAMELEN
+
-+ if (e->bitmask & EBT_SOURCEMAC) {
-+ verdict = 0;
-+ for (i = 0; i < 6; i++)
-+ verdict |= (h->h_source[i] ^ e->sourcemac[i]) &
-+ e->sourcemsk[i];
-+ if (FWINV2(verdict != 0, EBT_ISOURCE) )
-+ return 1;
-+ }
-+ if (e->bitmask & EBT_DESTMAC) {
-+ verdict = 0;
-+ for (i = 0; i < 6; i++)
-+ verdict |= (h->h_dest[i] ^ e->destmac[i]) &
-+ e->destmsk[i];
-+ if (FWINV2(verdict != 0, EBT_IDEST) )
-+ return 1;
-+ }
-+ return 0;
-+}
++// verdicts >0 are "branches"
++#define EBT_ACCEPT -1
++#define EBT_DROP -2
++#define EBT_CONTINUE -3
++#define EBT_RETURN -4
++#define NUM_STANDARD_TARGETS 4
+
-+// Do some firewalling
-+unsigned int ebt_do_table (unsigned int hook, struct sk_buff **pskb,
-+ const struct net_device *in, const struct net_device *out,
-+ struct ebt_table *table)
++struct ebt_replace
+{
-+ int i, nentries;
-+ struct ebt_entry *point;
-+ struct ebt_counter *counter_base, *cb_base;
-+ struct ebt_entry_target *t;
-+ int verdict, sp = 0;
-+ struct ebt_chainstack *cs;
-+ struct ebt_entries *chaininfo;
-+ char *base;
-+ struct ebt_table_info *private = table->private;
-+
-+ read_lock_bh(&table->lock);
-+ cb_base = COUNTER_BASE(private->counters, private->nentries,
-+ cpu_number_map(smp_processor_id()));
-+ if (private->chainstack)
-+ cs = private->chainstack[cpu_number_map(smp_processor_id())];
-+ else
-+ cs = NULL;
-+ chaininfo = private->hook_entry[hook];
-+ nentries = private->hook_entry[hook]->nentries;
-+ point = (struct ebt_entry *)(private->hook_entry[hook]->data);
-+ counter_base = cb_base + private->hook_entry[hook]->counter_offset;
-+ // base for chain jumps
-+ base = private->entries;
-+ i = 0;
-+ while (i < nentries) {
-+ if (ebt_basic_match(point, (**pskb).mac.ethernet, in, out))
-+ goto letscontinue;
++ char name[EBT_TABLE_MAXNAMELEN];
++ unsigned int valid_hooks;
++ // nr of rules in the table
++ unsigned int nentries;
++ // total size of the entries
++ unsigned int entries_size;
++ // start of the chains
++ struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
++ // nr of counters userspace expects back
++ unsigned int num_counters;
++ // where the kernel will put the old counters
++ struct ebt_counter *counters;
++ char *entries;
++};
+
-+ if (EBT_MATCH_ITERATE(point, ebt_do_match, *pskb, in, out) != 0)
-+ goto letscontinue;
++struct ebt_counter
++{
++ uint64_t pcnt;
++ uint64_t bcnt;
++};
+
-+ // increase counter
-+ (*(counter_base + i)).pcnt++;
-+ (*(counter_base + i)).bcnt+=(**pskb).len;
++struct ebt_entries {
++ // this field is always set to zero
++ // See EBT_ENTRY_OR_ENTRIES.
++ // Must be same size as ebt_entry.bitmask
++ unsigned int distinguisher;
++ // the chain name
++ char name[EBT_CHAIN_MAXNAMELEN];
++ // counter offset for this chain
++ unsigned int counter_offset;
++ // one standard (accept, drop, return) per hook
++ int policy;
++ // nr. of entries
++ unsigned int nentries;
++ // entry list
++ char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
+
-+ // these should only watch: not modify, nor tell us
-+ // what to do with the packet
-+ EBT_WATCHER_ITERATE(point, ebt_do_watcher, *pskb, in,
-+ out);
++// used for the bitmask of struct ebt_entry
+
-+ t = (struct ebt_entry_target *)
-+ (((char *)point) + point->target_offset);
-+ // standard target
-+ if (!t->u.target->target)
-+ verdict = ((struct ebt_standard_target *)t)->verdict;
-+ else
-+ verdict = t->u.target->target(pskb, hook,
-+ in, out, t->data, t->target_size);
-+ if (verdict == EBT_ACCEPT) {
-+ read_unlock_bh(&table->lock);
-+ return NF_ACCEPT;
-+ }
-+ if (verdict == EBT_DROP) {
-+ read_unlock_bh(&table->lock);
-+ return NF_DROP;
-+ }
-+ if (verdict == EBT_RETURN) {
-+letsreturn:
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ if (sp == 0) {
-+ BUGPRINT("RETURN on base chain");
-+ // act like this is EBT_CONTINUE
-+ goto letscontinue;
-+ }
-+#endif
-+ sp--;
-+ // put all the local variables right
-+ i = cs[sp].n;
-+ chaininfo = cs[sp].chaininfo;
-+ nentries = chaininfo->nentries;
-+ point = cs[sp].e;
-+ counter_base = cb_base +
-+ chaininfo->counter_offset;
-+ continue;
-+ }
-+ if (verdict == EBT_CONTINUE)
-+ goto letscontinue;
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ if (verdict < 0) {
-+ BUGPRINT("bogus standard verdict\n");
-+ read_unlock_bh(&table->lock);
-+ return NF_DROP;
-+ }
-+#endif
-+ // jump to a udc
-+ cs[sp].n = i + 1;
-+ cs[sp].chaininfo = chaininfo;
-+ cs[sp].e = (struct ebt_entry *)
-+ (((char *)point) + point->next_offset);
-+ i = 0;
-+ chaininfo = (struct ebt_entries *) (base + verdict);
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ if (chaininfo->distinguisher) {
-+ BUGPRINT("jump to non-chain\n");
-+ read_unlock_bh(&table->lock);
-+ return NF_DROP;
-+ }
-+#endif
-+ nentries = chaininfo->nentries;
-+ point = (struct ebt_entry *)chaininfo->data;
-+ counter_base = cb_base + chaininfo->counter_offset;
-+ sp++;
-+ continue;
-+letscontinue:
-+ point = (struct ebt_entry *)
-+ (((char *)point) + point->next_offset);
-+ i++;
-+ }
++// This is a hack to make a difference between an ebt_entry struct and an
++// ebt_entries struct when traversing the entries from start to end.
++// Using this simplifies the code alot, while still being able to use
++// ebt_entries.
++// Contrary, iptables doesn't use something like ebt_entries and therefore uses
++// different techniques for naming the policy and such. So, iptables doesn't
++// need a hack like this.
++#define EBT_ENTRY_OR_ENTRIES 0x01
++// these are the normal masks
++#define EBT_NOPROTO 0x02
++#define EBT_802_3 0x04
++#define EBT_SOURCEMAC 0x08
++#define EBT_DESTMAC 0x10
++#define EBT_F_MASK (EBT_NOPROTO | EBT_802_3 | EBT_SOURCEMAC | EBT_DESTMAC \
++ | EBT_ENTRY_OR_ENTRIES)
+
-+ // I actually like this :)
-+ if (chaininfo->policy == EBT_RETURN)
-+ goto letsreturn;
-+ if (chaininfo->policy == EBT_ACCEPT) {
-+ read_unlock_bh(&table->lock);
-+ return NF_ACCEPT;
-+ }
-+ read_unlock_bh(&table->lock);
-+ return NF_DROP;
-+}
++#define EBT_IPROTO 0x01
++#define EBT_IIN 0x02
++#define EBT_IOUT 0x04
++#define EBT_ISOURCE 0x8
++#define EBT_IDEST 0x10
++#define EBT_ILOGICALIN 0x20
++#define EBT_ILOGICALOUT 0x40
++#define EBT_INV_MASK (EBT_IPROTO | EBT_IIN | EBT_IOUT | EBT_ILOGICALIN \
++ | EBT_ILOGICALOUT | EBT_ISOURCE | EBT_IDEST)
+
-+// If it succeeds, returns element and locks mutex
-+static inline void *
-+find_inlist_lock_noload(struct list_head *head, const char *name, int *error,
-+ struct semaphore *mutex)
++struct ebt_entry_match
+{
-+ void *ret;
++ union {
++ char name[EBT_FUNCTION_MAXNAMELEN];
++ struct ebt_match *match;
++ } u;
++ // size of data
++ unsigned int match_size;
++ unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
+
-+ *error = down_interruptible(mutex);
-+ if (*error != 0)
-+ return NULL;
++struct ebt_entry_watcher
++{
++ union {
++ char name[EBT_FUNCTION_MAXNAMELEN];
++ struct ebt_watcher *watcher;
++ } u;
++ // size of data
++ unsigned int watcher_size;
++ unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
+
-+ ret = list_named_find(head, name);
-+ if (!ret) {
-+ *error = -ENOENT;
-+ up(mutex);
-+ }
-+ return ret;
-+}
++struct ebt_entry_target
++{
++ union {
++ char name[EBT_FUNCTION_MAXNAMELEN];
++ struct ebt_target *target;
++ } u;
++ // size of data
++ unsigned int target_size;
++ unsigned char data[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
+
-+#ifndef CONFIG_KMOD
-+#define find_inlist_lock(h,n,p,e,m) find_inlist_lock_noload((h),(n),(e),(m))
-+#else
-+static void *
-+find_inlist_lock(struct list_head *head, const char *name, const char *prefix,
-+ int *error, struct semaphore *mutex)
++#define EBT_STANDARD_TARGET "standard"
++struct ebt_standard_target
+{
-+ void *ret;
++ struct ebt_entry_target target;
++ int verdict;
++};
+
-+ ret = find_inlist_lock_noload(head, name, error, mutex);
-+ if (!ret) {
-+ char modulename[EBT_FUNCTION_MAXNAMELEN + strlen(prefix) + 1];
-+ strcpy(modulename, prefix);
-+ strcat(modulename, name);
-+ request_module(modulename);
-+ ret = find_inlist_lock_noload(head, name, error, mutex);
-+ }
-+ return ret;
-+}
-+#endif
++// one entry
++struct ebt_entry {
++ // this needs to be the first field
++ unsigned int bitmask;
++ unsigned int invflags;
++ uint16_t ethproto;
++ // the physical in-dev
++ char in[IFNAMSIZ];
++ // the logical in-dev
++ char logical_in[IFNAMSIZ];
++ // the physical out-dev
++ char out[IFNAMSIZ];
++ // the logical out-dev
++ char logical_out[IFNAMSIZ];
++ unsigned char sourcemac[ETH_ALEN];
++ unsigned char sourcemsk[ETH_ALEN];
++ unsigned char destmac[ETH_ALEN];
++ unsigned char destmsk[ETH_ALEN];
++ // sizeof ebt_entry + matches
++ unsigned int watchers_offset;
++ // sizeof ebt_entry + matches + watchers
++ unsigned int target_offset;
++ // sizeof ebt_entry + matches + watchers + target
++ unsigned int next_offset;
++ unsigned char elems[0] __attribute__ ((aligned (__alignof__(struct ebt_replace))));
++};
+
-+static inline struct ebt_table *
-+find_table_lock(const char *name, int *error, struct semaphore *mutex)
-+{
-+ return find_inlist_lock(&ebt_tables, name, "ebtable_", error, mutex);
-+}
++// [gs]etsockopt numbers
++#define EBT_BASE_CTL 128
+
-+static inline struct ebt_match *
-+find_match_lock(const char *name, int *error, struct semaphore *mutex)
++#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
++#define EBT_SO_SET_COUNTERS (EBT_SO_SET_ENTRIES+1)
++#define EBT_SO_SET_MAX (EBT_SO_SET_COUNTERS+1)
++
++#define EBT_SO_GET_INFO (EBT_BASE_CTL)
++#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO+1)
++#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES+1)
++#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO+1)
++#define EBT_SO_GET_MAX (EBT_SO_GET_INIT_ENTRIES+1)
++
++#ifdef __KERNEL__
++
++// return values for match() functions
++#define EBT_MATCH 0
++#define EBT_NOMATCH 1
++
++struct ebt_match
+{
-+ return find_inlist_lock(&ebt_matches, name, "ebt_", error, mutex);
-+}
++ struct list_head list;
++ const char name[EBT_FUNCTION_MAXNAMELEN];
++ // 0 == it matches
++ int (*match)(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *matchdata,
++ unsigned int datalen);
++ // 0 == let it in
++ int (*check)(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *matchdata, unsigned int datalen);
++ void (*destroy)(void *matchdata, unsigned int datalen);
++ struct module *me;
++};
+
-+static inline struct ebt_watcher *
-+find_watcher_lock(const char *name, int *error, struct semaphore *mutex)
++struct ebt_watcher
+{
-+ return find_inlist_lock(&ebt_watchers, name, "ebt_", error, mutex);
-+}
++ struct list_head list;
++ const char name[EBT_FUNCTION_MAXNAMELEN];
++ void (*watcher)(const struct sk_buff *skb, const struct net_device *in,
++ const struct net_device *out, const void *watcherdata,
++ unsigned int datalen);
++ // 0 == let it in
++ int (*check)(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *watcherdata, unsigned int datalen);
++ void (*destroy)(void *watcherdata, unsigned int datalen);
++ struct module *me;
++};
+
-+static inline struct ebt_target *
-+find_target_lock(const char *name, int *error, struct semaphore *mutex)
++struct ebt_target
+{
-+ return find_inlist_lock(&ebt_targets, name, "ebt_", error, mutex);
-+}
++ struct list_head list;
++ const char name[EBT_FUNCTION_MAXNAMELEN];
++ // returns one of the standard verdicts
++ int (*target)(struct sk_buff **pskb, unsigned int hooknr,
++ const struct net_device *in, const struct net_device *out,
++ const void *targetdata, unsigned int datalen);
++ // 0 == let it in
++ int (*check)(const char *tablename, unsigned int hookmask,
++ const struct ebt_entry *e, void *targetdata, unsigned int datalen);
++ void (*destroy)(void *targetdata, unsigned int datalen);
++ struct module *me;
++};
+
-+static inline int
-+ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
-+ const char *name, unsigned int hookmask, unsigned int *cnt)
++// used for jumping from and into user defined chains (udc)
++struct ebt_chainstack
+{
-+ struct ebt_match *match;
-+ int ret;
++ struct ebt_entries *chaininfo; // pointer to chain data
++ struct ebt_entry *e; // pointer to entry data
++ unsigned int n; // n'th entry
++};
+
-+ if (((char *)m) + m->match_size + sizeof(struct ebt_entry_match) >
-+ ((char *)e) + e->watchers_offset)
-+ return -EINVAL;
-+ match = find_match_lock(m->u.name, &ret, &ebt_mutex);
-+ if (!match)
-+ return ret;
-+ m->u.match = match;
-+ if (match->me)
-+ __MOD_INC_USE_COUNT(match->me);
-+ up(&ebt_mutex);
-+ if (match->check &&
-+ match->check(name, hookmask, e, m->data, m->match_size) != 0) {
-+ BUGPRINT("match->check failed\n");
-+ if (match->me)
-+ __MOD_DEC_USE_COUNT(match->me);
-+ return -EINVAL;
-+ }
-+ (*cnt)++;
-+ return 0;
-+}
++struct ebt_table_info
++{
++ // total size of the entries
++ unsigned int entries_size;
++ unsigned int nentries;
++ // pointers to the start of the chains
++ struct ebt_entries *hook_entry[NF_BR_NUMHOOKS];
++ // room to maintain the stack used for jumping from and into udc
++ struct ebt_chainstack **chainstack;
++ char *entries;
++ struct ebt_counter counters[0] ____cacheline_aligned;
++};
+
-+static inline int
-+ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
-+ const char *name, unsigned int hookmask, unsigned int *cnt)
++struct ebt_table
+{
-+ struct ebt_watcher *watcher;
-+ int ret;
++ struct list_head list;
++ char name[EBT_TABLE_MAXNAMELEN];
++ struct ebt_replace *table;
++ unsigned int valid_hooks;
++ rwlock_t lock;
++ // e.g. could be the table explicitly only allows certain
++ // matches, targets, ... 0 == let it in
++ int (*check)(const struct ebt_table_info *info,
++ unsigned int valid_hooks);
++ // the data used by the kernel
++ struct ebt_table_info *private;
++};
+
-+ if (((char *)w) + w->watcher_size + sizeof(struct ebt_entry_watcher) >
-+ ((char *)e) + e->target_offset)
-+ return -EINVAL;
-+ watcher = find_watcher_lock(w->u.name, &ret, &ebt_mutex);
-+ if (!watcher)
-+ return ret;
-+ w->u.watcher = watcher;
-+ if (watcher->me)
-+ __MOD_INC_USE_COUNT(watcher->me);
-+ up(&ebt_mutex);
-+ if (watcher->check &&
-+ watcher->check(name, hookmask, e, w->data, w->watcher_size) != 0) {
-+ BUGPRINT("watcher->check failed\n");
-+ if (watcher->me)
-+ __MOD_DEC_USE_COUNT(watcher->me);
-+ return -EINVAL;
-+ }
-+ (*cnt)++;
-+ return 0;
-+}
++#define EBT_ALIGN(s) (((s) + (__alignof__(struct ebt_replace)-1)) & \
++ ~(__alignof__(struct ebt_replace)-1))
++extern int ebt_register_table(struct ebt_table *table);
++extern void ebt_unregister_table(struct ebt_table *table);
++extern int ebt_register_match(struct ebt_match *match);
++extern void ebt_unregister_match(struct ebt_match *match);
++extern int ebt_register_watcher(struct ebt_watcher *watcher);
++extern void ebt_unregister_watcher(struct ebt_watcher *watcher);
++extern int ebt_register_target(struct ebt_target *target);
++extern void ebt_unregister_target(struct ebt_target *target);
++extern unsigned int ebt_do_table(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ struct ebt_table *table);
+
-+// this one is very careful, as it is the first function
-+// to parse the userspace data
-+static inline int
-+ebt_check_entry_size_and_hooks(struct ebt_entry *e,
-+ struct ebt_table_info *newinfo, char *base, char *limit,
-+ struct ebt_entries **hook_entries, unsigned int *n, unsigned int *cnt,
-+ unsigned int *totalcnt, unsigned int *udc_cnt, unsigned int valid_hooks)
-+{
-+ int i;
++ // Used in the kernel match() functions
++#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg))
++// True if the hook mask denotes that the rule is in a base chain,
++// used in the check() functions
++#define BASE_CHAIN (hookmask & (1 << NF_BR_NUMHOOKS))
++// Clear the bit in the hook mask that tells if the rule is on a base chain
++#define CLEAR_BASE_CHAIN_BIT (hookmask &= ~(1 << NF_BR_NUMHOOKS))
++// True if the target is not a standard target
++#define INVALID_TARGET (info->target < -NUM_STANDARD_TARGETS || info->target >= 0)
+
-+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
-+ if ((valid_hooks & (1 << i)) == 0)
-+ continue;
-+ if ( (char *)hook_entries[i] - base ==
-+ (char *)e - newinfo->entries)
-+ break;
-+ }
-+ // beginning of a new chain
-+ // if i == NF_BR_NUMHOOKS it must be a user defined chain
-+ if (i != NF_BR_NUMHOOKS || !(e->bitmask & EBT_ENTRY_OR_ENTRIES)) {
-+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) != 0) {
-+ // we make userspace set this right,
-+ // so there is no misunderstanding
-+ BUGPRINT("EBT_ENTRY_OR_ENTRIES shouldn't be set "
-+ "in distinguisher\n");
-+ return -EINVAL;
-+ }
-+ // this checks if the previous chain has as many entries
-+ // as it said it has
-+ if (*n != *cnt) {
-+ BUGPRINT("nentries does not equal the nr of entries "
-+ "in the chain\n");
-+ return -EINVAL;
-+ }
-+ // before we look at the struct, be sure it is not too big
-+ if ((char *)hook_entries[i] + sizeof(struct ebt_entries)
-+ > limit) {
-+ BUGPRINT("entries_size too small\n");
-+ return -EINVAL;
-+ }
-+ if (((struct ebt_entries *)e)->policy != EBT_DROP &&
-+ ((struct ebt_entries *)e)->policy != EBT_ACCEPT) {
-+ // only RETURN from udc
-+ if (i != NF_BR_NUMHOOKS ||
-+ ((struct ebt_entries *)e)->policy != EBT_RETURN) {
-+ BUGPRINT("bad policy\n");
-+ return -EINVAL;
-+ }
-+ }
-+ if (i == NF_BR_NUMHOOKS) // it's a user defined chain
-+ (*udc_cnt)++;
-+ else
-+ newinfo->hook_entry[i] = (struct ebt_entries *)e;
-+ if (((struct ebt_entries *)e)->counter_offset != *totalcnt) {
-+ BUGPRINT("counter_offset != totalcnt");
-+ return -EINVAL;
-+ }
-+ *n = ((struct ebt_entries *)e)->nentries;
-+ *cnt = 0;
-+ return 0;
-+ }
-+ // a plain old entry, heh
-+ if (sizeof(struct ebt_entry) > e->watchers_offset ||
-+ e->watchers_offset > e->target_offset ||
-+ e->target_offset >= e->next_offset) {
-+ BUGPRINT("entry offsets not in right order\n");
-+ return -EINVAL;
-+ }
-+ // this is not checked anywhere else
-+ if (e->next_offset - e->target_offset < sizeof(struct ebt_entry_target)) {
-+ BUGPRINT("target size too small\n");
-+ return -EINVAL;
-+ }
-+
-+ (*cnt)++;
-+ (*totalcnt)++;
-+ return 0;
-+}
++#endif /* __KERNEL__ */
+
-+struct ebt_cl_stack
-+{
-+ struct ebt_chainstack cs;
-+ int from;
-+ unsigned int hookmask;
-+};
++// blatently stolen from ip_tables.h
++// fn returns 0 to continue iteration
++#define EBT_MATCH_ITERATE(e, fn, args...) \
++({ \
++ unsigned int __i; \
++ int __ret = 0; \
++ struct ebt_entry_match *__match; \
++ \
++ for (__i = sizeof(struct ebt_entry); \
++ __i < (e)->watchers_offset; \
++ __i += __match->match_size + \
++ sizeof(struct ebt_entry_match)) { \
++ __match = (void *)(e) + __i; \
++ \
++ __ret = fn(__match , ## args); \
++ if (__ret != 0) \
++ break; \
++ } \
++ if (__ret == 0) { \
++ if (__i != (e)->watchers_offset) \
++ __ret = -EINVAL; \
++ } \
++ __ret; \
++})
+
-+// we need these positions to check that the jumps to a different part of the
-+// entries is a jump to the beginning of a new chain.
-+static inline int
-+ebt_get_udc_positions(struct ebt_entry *e, struct ebt_table_info *newinfo,
-+ struct ebt_entries **hook_entries, unsigned int *n, unsigned int valid_hooks,
-+ struct ebt_cl_stack *udc)
-+{
-+ int i;
++#define EBT_WATCHER_ITERATE(e, fn, args...) \
++({ \
++ unsigned int __i; \
++ int __ret = 0; \
++ struct ebt_entry_watcher *__watcher; \
++ \
++ for (__i = e->watchers_offset; \
++ __i < (e)->target_offset; \
++ __i += __watcher->watcher_size + \
++ sizeof(struct ebt_entry_watcher)) { \
++ __watcher = (void *)(e) + __i; \
++ \
++ __ret = fn(__watcher , ## args); \
++ if (__ret != 0) \
++ break; \
++ } \
++ if (__ret == 0) { \
++ if (__i != (e)->target_offset) \
++ __ret = -EINVAL; \
++ } \
++ __ret; \
++})
+
-+ // we're only interested in chain starts
-+ if (e->bitmask & EBT_ENTRY_OR_ENTRIES)
-+ return 0;
-+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
-+ if ((valid_hooks & (1 << i)) == 0)
-+ continue;
-+ if (newinfo->hook_entry[i] == (struct ebt_entries *)e)
-+ break;
-+ }
-+ // only care about udc
-+ if (i != NF_BR_NUMHOOKS)
-+ return 0;
++#define EBT_ENTRY_ITERATE(entries, size, fn, args...) \
++({ \
++ unsigned int __i; \
++ int __ret = 0; \
++ struct ebt_entry *__entry; \
++ \
++ for (__i = 0; __i < (size);) { \
++ __entry = (void *)(entries) + __i; \
++ __ret = fn(__entry , ## args); \
++ if (__ret != 0) \
++ break; \
++ if (__entry->bitmask != 0) \
++ __i += __entry->next_offset; \
++ else \
++ __i += sizeof(struct ebt_entries); \
++ } \
++ if (__ret == 0) { \
++ if (__i != (size)) \
++ __ret = -EINVAL; \
++ } \
++ __ret; \
++})
+
-+ udc[*n].cs.chaininfo = (struct ebt_entries *)e;
-+ // these initialisations are depended on later in check_chainloops()
-+ udc[*n].cs.n = 0;
-+ udc[*n].hookmask = 0;
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_802_3.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,60 @@
++#ifndef __LINUX_BRIDGE_EBT_802_3_H
++#define __LINUX_BRIDGE_EBT_802_3_H
+
-+ (*n)++;
-+ return 0;
-+}
++#define EBT_802_3_SAP 0x01
++#define EBT_802_3_TYPE 0x02
+
-+static inline int
-+ebt_cleanup_match(struct ebt_entry_match *m, unsigned int *i)
-+{
-+ if (i && (*i)-- == 0)
-+ return 1;
-+ if (m->u.match->destroy)
-+ m->u.match->destroy(m->data, m->match_size);
-+ if (m->u.match->me)
-+ __MOD_DEC_USE_COUNT(m->u.match->me);
++#define EBT_802_3_MATCH "802_3"
+
-+ return 0;
-+}
++/*
++ * If frame has DSAP/SSAP value 0xaa you must check the SNAP type
++ * to discover what kind of packet we're carrying.
++ */
++#define CHECK_TYPE 0xaa
+
-+static inline int
-+ebt_cleanup_watcher(struct ebt_entry_watcher *w, unsigned int *i)
-+{
-+ if (i && (*i)-- == 0)
-+ return 1;
-+ if (w->u.watcher->destroy)
-+ w->u.watcher->destroy(w->data, w->watcher_size);
-+ if (w->u.watcher->me)
-+ __MOD_DEC_USE_COUNT(w->u.watcher->me);
++/*
++ * Control field may be one or two bytes. If the first byte has
++ * the value 0x03 then the entire length is one byte, otherwise it is two.
++ * One byte controls are used in Unnumbered Information frames.
++ * Two byte controls are used in Numbered Information frames.
++ */
++#define IS_UI 0x03
+
-+ return 0;
-+}
++#define EBT_802_3_MASK (EBT_802_3_SAP | EBT_802_3_TYPE | EBT_802_3)
+
-+static inline int
-+ebt_cleanup_entry(struct ebt_entry *e, unsigned int *cnt)
-+{
-+ struct ebt_entry_target *t;
++/* ui has one byte ctrl, ni has two */
++struct hdr_ui {
++ uint8_t dsap;
++ uint8_t ssap;
++ uint8_t ctrl;
++ uint8_t orig[3];
++ uint16_t type;
++};
+
-+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
-+ return 0;
-+ // we're done
-+ if (cnt && (*cnt)-- == 0)
-+ return 1;
-+ EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, NULL);
-+ EBT_MATCH_ITERATE(e, ebt_cleanup_match, NULL);
-+ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
-+ if (t->u.target->destroy)
-+ t->u.target->destroy(t->data, t->target_size);
-+ if (t->u.target->me)
-+ __MOD_DEC_USE_COUNT(t->u.target->me);
++struct hdr_ni {
++ uint8_t dsap;
++ uint8_t ssap;
++ uint16_t ctrl;
++ uint8_t orig[3];
++ uint16_t type;
++};
+
-+ return 0;
-+}
++struct ebt_802_3_hdr {
++ uint8_t daddr[6];
++ uint8_t saddr[6];
++ uint16_t len;
++ union {
++ struct hdr_ui ui;
++ struct hdr_ni ni;
++ } llc;
++};
+
-+static inline int
-+ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
-+ const char *name, unsigned int *cnt, unsigned int valid_hooks,
-+ struct ebt_cl_stack *cl_s, unsigned int udc_cnt)
++struct ebt_802_3_info
+{
-+ struct ebt_entry_target *t;
-+ struct ebt_target *target;
-+ unsigned int i, j, hook = 0, hookmask = 0;
-+ int ret;
-+
-+ // Don't mess with the struct ebt_entries
-+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
-+ return 0;
++ uint8_t sap;
++ uint16_t type;
++ uint8_t bitmask;
++ uint8_t invflags;
++};
+
-+ if (e->bitmask & ~EBT_F_MASK) {
-+ BUGPRINT("Unknown flag for bitmask\n");
-+ return -EINVAL;
-+ }
-+ if (e->invflags & ~EBT_INV_MASK) {
-+ BUGPRINT("Unknown flag for inv bitmask\n");
-+ return -EINVAL;
-+ }
-+ if ( (e->bitmask & EBT_NOPROTO) && (e->bitmask & EBT_802_3) ) {
-+ BUGPRINT("NOPROTO & 802_3 not allowed\n");
-+ return -EINVAL;
-+ }
-+ // what hook do we belong to?
-+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
-+ if ((valid_hooks & (1 << i)) == 0)
-+ continue;
-+ if ((char *)newinfo->hook_entry[i] < (char *)e)
-+ hook = i;
-+ else
-+ break;
-+ }
-+ // (1 << NF_BR_NUMHOOKS) tells the check functions the rule is on
-+ // a base chain
-+ if (i < NF_BR_NUMHOOKS)
-+ hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
-+ else {
-+ for (i = 0; i < udc_cnt; i++)
-+ if ((char *)(cl_s[i].cs.chaininfo) > (char *)e)
-+ break;
-+ if (i == 0)
-+ hookmask = (1 << hook) | (1 << NF_BR_NUMHOOKS);
-+ else
-+ hookmask = cl_s[i - 1].hookmask;
-+ }
-+ i = 0;
-+ ret = EBT_MATCH_ITERATE(e, ebt_check_match, e, name, hookmask, &i);
-+ if (ret != 0)
-+ goto cleanup_matches;
-+ j = 0;
-+ ret = EBT_WATCHER_ITERATE(e, ebt_check_watcher, e, name, hookmask, &j);
-+ if (ret != 0)
-+ goto cleanup_watchers;
-+ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
-+ target = find_target_lock(t->u.name, &ret, &ebt_mutex);
-+ if (!target)
-+ goto cleanup_watchers;
-+ if (target->me)
-+ __MOD_INC_USE_COUNT(target->me);
-+ up(&ebt_mutex);
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_arp.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,32 @@
++#ifndef __LINUX_BRIDGE_EBT_ARP_H
++#define __LINUX_BRIDGE_EBT_ARP_H
+
-+ t->u.target = target;
-+ if (t->u.target == &ebt_standard_target) {
-+ if (e->target_offset + sizeof(struct ebt_standard_target) >
-+ e->next_offset) {
-+ BUGPRINT("Standard target size too big\n");
-+ ret = -EFAULT;
-+ goto cleanup_watchers;
-+ }
-+ if (((struct ebt_standard_target *)t)->verdict <
-+ -NUM_STANDARD_TARGETS) {
-+ BUGPRINT("Invalid standard target\n");
-+ ret = -EFAULT;
-+ goto cleanup_watchers;
-+ }
-+ } else if ((e->target_offset + t->target_size +
-+ sizeof(struct ebt_entry_target) > e->next_offset) ||
-+ (t->u.target->check &&
-+ t->u.target->check(name, hookmask, e, t->data, t->target_size) != 0)){
-+ if (t->u.target->me)
-+ __MOD_DEC_USE_COUNT(t->u.target->me);
-+ ret = -EFAULT;
-+ goto cleanup_watchers;
-+ }
-+ (*cnt)++;
-+ return 0;
-+cleanup_watchers:
-+ EBT_WATCHER_ITERATE(e, ebt_cleanup_watcher, &j);
-+cleanup_matches:
-+ EBT_MATCH_ITERATE(e, ebt_cleanup_match, &i);
-+ return ret;
-+}
++#define EBT_ARP_OPCODE 0x01
++#define EBT_ARP_HTYPE 0x02
++#define EBT_ARP_PTYPE 0x04
++#define EBT_ARP_SRC_IP 0x08
++#define EBT_ARP_DST_IP 0x10
++#define EBT_ARP_SRC_MAC 0x20
++#define EBT_ARP_DST_MAC 0x40
++#define EBT_ARP_MASK (EBT_ARP_OPCODE | EBT_ARP_HTYPE | EBT_ARP_PTYPE | \
++ EBT_ARP_SRC_IP | EBT_ARP_DST_IP | EBT_ARP_SRC_MAC | EBT_ARP_DST_MAC)
++#define EBT_ARP_MATCH "arp"
+
-+// checks for loops and sets the hook mask for udc
-+// the hook mask for udc tells us from which base chains the udc can be
-+// accessed. This mask is a parameter to the check() functions of the extensions
-+static int check_chainloops(struct ebt_entries *chain,
-+ struct ebt_cl_stack *cl_s, unsigned int udc_cnt,
-+ unsigned int hooknr, char *base)
++struct ebt_arp_info
+{
-+ int i, chain_nr = -1, pos = 0, nentries = chain->nentries, verdict;
-+ struct ebt_entry *e = (struct ebt_entry *)chain->data;
-+ struct ebt_entry_target *t;
++ uint16_t htype;
++ uint16_t ptype;
++ uint16_t opcode;
++ uint32_t saddr;
++ uint32_t smsk;
++ uint32_t daddr;
++ uint32_t dmsk;
++ unsigned char smaddr[ETH_ALEN];
++ unsigned char smmsk[ETH_ALEN];
++ unsigned char dmaddr[ETH_ALEN];
++ unsigned char dmmsk[ETH_ALEN];
++ uint8_t bitmask;
++ uint8_t invflags;
++};
+
-+ while (pos < nentries || chain_nr != -1) {
-+ // end of udc, go back one 'recursion' step
-+ if (pos == nentries) {
-+ // put back values of the time when this chain was called
-+ e = cl_s[chain_nr].cs.e;
-+ if (cl_s[chain_nr].from != -1)
-+ nentries =
-+ cl_s[cl_s[chain_nr].from].cs.chaininfo->nentries;
-+ else
-+ nentries = chain->nentries;
-+ pos = cl_s[chain_nr].cs.n;
-+ // make sure we won't see a loop that isn't one
-+ cl_s[chain_nr].cs.n = 0;
-+ chain_nr = cl_s[chain_nr].from;
-+ if (pos == nentries)
-+ continue;
-+ }
-+ t = (struct ebt_entry_target *)
-+ (((char *)e) + e->target_offset);
-+ if (strcmp(t->u.name, EBT_STANDARD_TARGET))
-+ goto letscontinue;
-+ if (e->target_offset + sizeof(struct ebt_standard_target) >
-+ e->next_offset) {
-+ BUGPRINT("Standard target size too big\n");
-+ return -1;
-+ }
-+ verdict = ((struct ebt_standard_target *)t)->verdict;
-+ if (verdict >= 0) { // jump to another chain
-+ struct ebt_entries *hlp2 =
-+ (struct ebt_entries *)(base + verdict);
-+ for (i = 0; i < udc_cnt; i++)
-+ if (hlp2 == cl_s[i].cs.chaininfo)
-+ break;
-+ // bad destination or loop
-+ if (i == udc_cnt) {
-+ BUGPRINT("bad destination\n");
-+ return -1;
-+ }
-+ if (cl_s[i].cs.n) {
-+ BUGPRINT("loop\n");
-+ return -1;
-+ }
-+ // this can't be 0, so the above test is correct
-+ cl_s[i].cs.n = pos + 1;
-+ pos = 0;
-+ cl_s[i].cs.e = ((void *)e + e->next_offset);
-+ e = (struct ebt_entry *)(hlp2->data);
-+ nentries = hlp2->nentries;
-+ cl_s[i].from = chain_nr;
-+ chain_nr = i;
-+ // this udc is accessible from the base chain for hooknr
-+ cl_s[i].hookmask |= (1 << hooknr);
-+ continue;
-+ }
-+letscontinue:
-+ e = (void *)e + e->next_offset;
-+ pos++;
-+ }
-+ return 0;
-+}
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_ip.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,43 @@
++/*
++ * ebt_ip
++ *
++ * Authors:
++ * Bart De Schuymer <bart.de.schuymer@pandora.be>
++ *
++ * April, 2002
++ *
++ * Changes:
++ * added ip-sport and ip-dport
++ * Innominate Security Technologies AG <mhopf@innominate.com>
++ * September, 2002
++ */
+
-+// do the parsing of the table/chains/entries/matches/watchers/targets, heh
-+static int translate_table(struct ebt_replace *repl,
-+ struct ebt_table_info *newinfo)
++#ifndef __LINUX_BRIDGE_EBT_IP_H
++#define __LINUX_BRIDGE_EBT_IP_H
++
++#define EBT_IP_SOURCE 0x01
++#define EBT_IP_DEST 0x02
++#define EBT_IP_TOS 0x04
++#define EBT_IP_PROTO 0x08
++#define EBT_IP_SPORT 0x10
++#define EBT_IP_DPORT 0x20
++#define EBT_IP_MASK (EBT_IP_SOURCE | EBT_IP_DEST | EBT_IP_TOS | EBT_IP_PROTO |\
++ EBT_IP_SPORT | EBT_IP_DPORT )
++#define EBT_IP_MATCH "ip"
++
++// the same values are used for the invflags
++struct ebt_ip_info
+{
-+ unsigned int i, j, k, udc_cnt;
-+ int ret;
-+ struct ebt_cl_stack *cl_s = NULL; // used in the checking for chain loops
++ uint32_t saddr;
++ uint32_t daddr;
++ uint32_t smsk;
++ uint32_t dmsk;
++ uint8_t tos;
++ uint8_t protocol;
++ uint8_t bitmask;
++ uint8_t invflags;
++ uint16_t sport[2];
++ uint16_t dport[2];
++};
+
-+ i = 0;
-+ while (i < NF_BR_NUMHOOKS && !(repl->valid_hooks & (1 << i)))
-+ i++;
-+ if (i == NF_BR_NUMHOOKS) {
-+ BUGPRINT("No valid hooks specified\n");
-+ return -EINVAL;
-+ }
-+ if (repl->hook_entry[i] != (struct ebt_entries *)repl->entries) {
-+ BUGPRINT("Chains don't start at beginning\n");
-+ return -EINVAL;
-+ }
-+ // make sure chains are ordered after each other in same order
-+ // as their corresponding hooks
-+ for (j = i + 1; j < NF_BR_NUMHOOKS; j++) {
-+ if (!(repl->valid_hooks & (1 << j)))
-+ continue;
-+ if ( repl->hook_entry[j] <= repl->hook_entry[i] ) {
-+ BUGPRINT("Hook order must be followed\n");
-+ return -EINVAL;
-+ }
-+ i = j;
-+ }
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_pkttype.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,11 @@
++#ifndef __LINUX_BRIDGE_EBT_PKTTYPE_H
++#define __LINUX_BRIDGE_EBT_PKTTYPE_H
+
-+ for (i = 0; i < NF_BR_NUMHOOKS; i++)
-+ newinfo->hook_entry[i] = NULL;
++struct ebt_pkttype_info
++{
++ uint8_t pkt_type;
++ uint8_t invert;
++};
++#define EBT_PKTTYPE_MATCH "pkttype"
++
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_stp.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,46 @@
++#ifndef __LINUX_BRIDGE_EBT_STP_H
++#define __LINUX_BRIDGE_EBT_STP_H
++
++#define EBT_STP_TYPE 0x0001
++
++#define EBT_STP_FLAGS 0x0002
++#define EBT_STP_ROOTPRIO 0x0004
++#define EBT_STP_ROOTADDR 0x0008
++#define EBT_STP_ROOTCOST 0x0010
++#define EBT_STP_SENDERPRIO 0x0020
++#define EBT_STP_SENDERADDR 0x0040
++#define EBT_STP_PORT 0x0080
++#define EBT_STP_MSGAGE 0x0100
++#define EBT_STP_MAXAGE 0x0200
++#define EBT_STP_HELLOTIME 0x0400
++#define EBT_STP_FWDD 0x0800
++
++#define EBT_STP_MASK 0x0fff
++#define EBT_STP_CONFIG_MASK 0x0ffe
++
++#define EBT_STP_MATCH "stp"
++
++struct ebt_stp_config_info
++{
++ uint8_t flags;
++ uint16_t root_priol, root_priou;
++ char root_addr[6], root_addrmsk[6];
++ uint32_t root_costl, root_costu;
++ uint16_t sender_priol, sender_priou;
++ char sender_addr[6], sender_addrmsk[6];
++ uint16_t portl, portu;
++ uint16_t msg_agel, msg_ageu;
++ uint16_t max_agel, max_ageu;
++ uint16_t hello_timel, hello_timeu;
++ uint16_t forward_delayl, forward_delayu;
++};
++
++struct ebt_stp_info
++{
++ uint8_t type;
++ struct ebt_stp_config_info config;
++ uint16_t bitmask;
++ uint16_t invflags;
++};
++
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_vlan.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,20 @@
++#ifndef __LINUX_BRIDGE_EBT_VLAN_H
++#define __LINUX_BRIDGE_EBT_VLAN_H
++
++#define EBT_VLAN_ID 0x01
++#define EBT_VLAN_PRIO 0x02
++#define EBT_VLAN_ENCAP 0x04
++#define EBT_VLAN_MASK (EBT_VLAN_ID | EBT_VLAN_PRIO | EBT_VLAN_ENCAP)
++#define EBT_VLAN_MATCH "vlan"
++
++struct ebt_vlan_info {
++ uint16_t id; /* VLAN ID {1-4095} */
++ uint8_t prio; /* VLAN User Priority {0-7} */
++ uint16_t encap; /* VLAN Encapsulated frame code {0-65535} */
++ uint8_t bitmask; /* Args bitmask bit 1=1 - ID arg,
++ bit 2=1 User-Priority arg, bit 3=1 encap*/
++ uint8_t invflags; /* Inverse bitmask bit 1=1 - inversed ID arg,
++ bit 2=1 - inversed Pirority arg */
++};
++
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_log.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,17 @@
++#ifndef __LINUX_BRIDGE_EBT_LOG_H
++#define __LINUX_BRIDGE_EBT_LOG_H
++
++#define EBT_LOG_IP 0x01 // if the frame is made by ip, log the ip information
++#define EBT_LOG_ARP 0x02
++#define EBT_LOG_MASK (EBT_LOG_IP | EBT_LOG_ARP)
++#define EBT_LOG_PREFIX_SIZE 30
++#define EBT_LOG_WATCHER "log"
++
++struct ebt_log_info
++{
++ uint8_t loglevel;
++ uint8_t prefix[EBT_LOG_PREFIX_SIZE];
++ uint32_t bitmask;
++};
++
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_nat.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,13 @@
++#ifndef __LINUX_BRIDGE_EBT_NAT_H
++#define __LINUX_BRIDGE_EBT_NAT_H
++
++struct ebt_nat_info
++{
++ unsigned char mac[ETH_ALEN];
++ // EBT_ACCEPT, EBT_DROP, EBT_CONTINUE or EBT_RETURN
++ int target;
++};
++#define EBT_SNAT_TARGET "snat"
++#define EBT_DNAT_TARGET "dnat"
+
-+ newinfo->entries_size = repl->entries_size;
-+ newinfo->nentries = repl->nentries;
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_redirect.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,11 @@
++#ifndef __LINUX_BRIDGE_EBT_REDIRECT_H
++#define __LINUX_BRIDGE_EBT_REDIRECT_H
+
-+ // do some early checkings and initialize some things
-+ i = 0; // holds the expected nr. of entries for the chain
-+ j = 0; // holds the up to now counted entries for the chain
-+ k = 0; // holds the total nr. of entries, should equal
-+ // newinfo->nentries afterwards
-+ udc_cnt = 0; // will hold the nr. of user defined chains (udc)
-+ ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
-+ ebt_check_entry_size_and_hooks, newinfo, repl->entries,
-+ repl->entries + repl->entries_size, repl->hook_entry, &i, &j, &k,
-+ &udc_cnt, repl->valid_hooks);
++struct ebt_redirect_info
++{
++ // EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
++ int target;
++};
++#define EBT_REDIRECT_TARGET "redirect"
+
-+ if (ret != 0)
-+ return ret;
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_mark_m.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,15 @@
++#ifndef __LINUX_BRIDGE_EBT_MARK_M_H
++#define __LINUX_BRIDGE_EBT_MARK_M_H
+
-+ if (i != j) {
-+ BUGPRINT("nentries does not equal the nr of entries in the "
-+ "(last) chain\n");
-+ return -EINVAL;
-+ }
-+ if (k != newinfo->nentries) {
-+ BUGPRINT("Total nentries is wrong\n");
-+ return -EINVAL;
-+ }
++#define EBT_MARK_AND 0x01
++#define EBT_MARK_OR 0x02
++#define EBT_MARK_MASK (EBT_MARK_AND | EBT_MARK_OR)
++struct ebt_mark_m_info
++{
++ unsigned long mark, mask;
++ uint8_t invert;
++ uint8_t bitmask;
++};
++#define EBT_MARK_MATCH "mark_m"
+
-+ // check if all valid hooks have a chain
-+ for (i = 0; i < NF_BR_NUMHOOKS; i++) {
-+ if (newinfo->hook_entry[i] == NULL &&
-+ (repl->valid_hooks & (1 << i))) {
-+ BUGPRINT("Valid hook without chain\n");
-+ return -EINVAL;
-+ }
-+ }
++#endif
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_bridge/ebt_mark_t.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,12 @@
++#ifndef __LINUX_BRIDGE_EBT_MARK_T_H
++#define __LINUX_BRIDGE_EBT_MARK_T_H
+
-+ // Get the location of the udc, put them in an array
-+ // While we're at it, allocate the chainstack
-+ if (udc_cnt) {
-+ // this will get free'd in do_replace()/ebt_register_table()
-+ // if an error occurs
-+ newinfo->chainstack = (struct ebt_chainstack **)
-+ vmalloc(smp_num_cpus * sizeof(struct ebt_chainstack));
-+ if (!newinfo->chainstack)
-+ return -ENOMEM;
-+ for (i = 0; i < smp_num_cpus; i++) {
-+ newinfo->chainstack[i] =
-+ vmalloc(udc_cnt * sizeof(struct ebt_chainstack));
-+ if (!newinfo->chainstack[i]) {
-+ while (i)
-+ vfree(newinfo->chainstack[--i]);
-+ vfree(newinfo->chainstack);
-+ newinfo->chainstack = NULL;
-+ return -ENOMEM;
-+ }
-+ }
++struct ebt_mark_t_info
++{
++ unsigned long mark;
++ // EBT_ACCEPT, EBT_DROP or EBT_CONTINUE or EBT_RETURN
++ int target;
++};
++#define EBT_MARK_TARGET "mark"
+
-+ cl_s = (struct ebt_cl_stack *)
-+ vmalloc(udc_cnt * sizeof(struct ebt_cl_stack));
-+ if (!cl_s)
-+ return -ENOMEM;
-+ i = 0; // the i'th udc
-+ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
-+ ebt_get_udc_positions, newinfo, repl->hook_entry, &i,
-+ repl->valid_hooks, cl_s);
-+ // sanity check
-+ if (i != udc_cnt) {
-+ BUGPRINT("i != udc_cnt\n");
-+ vfree(cl_s);
-+ return -EFAULT;
-+ }
-+ }
++#endif
+--- linux-2.4.21/include/linux/netfilter.h Thu Nov 22 20:47:48 2001
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter.h Fri Aug 8 01:09:06 2003
+@@ -117,28 +117,34 @@ extern struct list_head nf_hooks[NPROTO]
+ /* This is gross, but inline doesn't cut it for avoiding the function
+ call in fast path: gcc doesn't inline (needs value tracking?). --RR */
+ #ifdef CONFIG_NETFILTER_DEBUG
+-#define NF_HOOK nf_hook_slow
++#define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
++nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN)
++#define NF_HOOK_THRESH nf_hook_slow
+ #else
+ #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
+ (list_empty(&nf_hooks[(pf)][(hook)]) \
+ ? (okfn)(skb) \
+- : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn)))
++ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), INT_MIN))
++#define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
++(list_empty(&nf_hooks[(pf)][(hook)]) \
++ ? (okfn)(skb) \
++ : nf_hook_slow((pf), (hook), (skb), (indev), (outdev), (okfn), (thresh)))
+ #endif
+
+ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
+ struct net_device *indev, struct net_device *outdev,
+- int (*okfn)(struct sk_buff *));
++ int (*okfn)(struct sk_buff *), int thresh);
+
+ /* Call setsockopt() */
+-int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt,
++int nf_setsockopt(struct sock *sk, int pf, int optval, char *opt,
+ int len);
+ int nf_getsockopt(struct sock *sk, int pf, int optval, char *opt,
+ int *len);
+
+ /* Packet queuing */
+-typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
++typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
+ struct nf_info *info, void *data);
+-extern int nf_register_queue_handler(int pf,
++extern int nf_register_queue_handler(int pf,
+ nf_queue_outfn_t outfn, void *data);
+ extern int nf_unregister_queue_handler(int pf);
+ extern void nf_reinject(struct sk_buff *skb,
+--- linux-2.4.21/include/linux/netfilter_ipv4.h Mon Feb 25 20:38:13 2002
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_ipv4.h Fri Aug 8 01:09:06 2003
+@@ -52,8 +52,10 @@
+ enum nf_ip_hook_priorities {
+ NF_IP_PRI_FIRST = INT_MIN,
+ NF_IP_PRI_CONNTRACK = -200,
++ NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD = -175,
+ NF_IP_PRI_MANGLE = -150,
+ NF_IP_PRI_NAT_DST = -100,
++ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT = -50,
+ NF_IP_PRI_FILTER = 0,
+ NF_IP_PRI_NAT_SRC = 100,
+ NF_IP_PRI_LAST = INT_MAX,
+--- linux-2.4.21/include/linux/skbuff.h Fri Jun 13 16:51:39 2003
++++ linux-2.4.21-ebt-brnf-3/include/linux/skbuff.h Fri Aug 8 01:09:06 2003
+@@ -92,6 +92,17 @@ struct nf_conntrack {
+ struct nf_ct_info {
+ struct nf_conntrack *master;
+ };
+
-+ // Check for loops
-+ for (i = 0; i < NF_BR_NUMHOOKS; i++)
-+ if (repl->valid_hooks & (1 << i))
-+ if (check_chainloops(newinfo->hook_entry[i],
-+ cl_s, udc_cnt, i, newinfo->entries)) {
-+ if (cl_s)
-+ vfree(cl_s);
-+ return -EINVAL;
-+ }
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++struct nf_bridge_info {
++ atomic_t use;
++ struct net_device *physindev;
++ struct net_device *physoutdev;
++ unsigned int mask;
++ unsigned long hh[16 / sizeof(unsigned long)];
++};
++#endif
+
-+ // we now know the following (along with E=mc²):
-+ // - the nr of entries in each chain is right
-+ // - the size of the allocated space is right
-+ // - all valid hooks have a corresponding chain
-+ // - there are no loops
-+ // - wrong data can still be on the level of a single entry
-+ // - could be there are jumps to places that are not the
-+ // beginning of a chain. This can only occur in chains that
-+ // are not accessible from any base chains, so we don't care.
+ #endif
+
+ struct sk_buff_head {
+@@ -204,6 +215,9 @@ struct sk_buff {
+ #ifdef CONFIG_NETFILTER_DEBUG
+ unsigned int nf_debug;
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ struct nf_bridge_info *nf_bridge; /* Saved data about a bridged frame - see br_netfilter.c */
++#endif
+ #endif /*CONFIG_NETFILTER*/
+
+ #if defined(CONFIG_HIPPI)
+@@ -278,7 +292,7 @@ static inline struct sk_buff *skb_get(st
+ * If users==1, we are the only owner and are can avoid redundant
+ * atomic change.
+ */
+-
++
+ /**
+ * kfree_skb - free an sk_buff
+ * @skb: buffer to free
+@@ -286,7 +300,7 @@ static inline struct sk_buff *skb_get(st
+ * Drop a reference to the buffer and free it if the usage count has
+ * hit zero.
+ */
+-
++
+ static inline void kfree_skb(struct sk_buff *skb)
+ {
+ if (atomic_read(&skb->users) == 1 || atomic_dec_and_test(&skb->users))
+@@ -1165,6 +1179,20 @@ nf_conntrack_get(struct nf_ct_info *nfct
+ if (nfct)
+ atomic_inc(&nfct->master->use);
+ }
+
-+ // used to know what we need to clean up if something goes wrong
-+ i = 0;
-+ ret = EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
-+ ebt_check_entry, newinfo, repl->name, &i, repl->valid_hooks,
-+ cl_s, udc_cnt);
-+ if (ret != 0) {
-+ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
-+ ebt_cleanup_entry, &i);
-+ }
-+ if (cl_s)
-+ vfree(cl_s);
-+ return ret;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++static inline void nf_bridge_put(struct nf_bridge_info *nf_bridge)
++{
++ if (nf_bridge && atomic_dec_and_test(&nf_bridge->use))
++ kfree(nf_bridge);
+}
-+
-+// called under write_lock
-+static void get_counters(struct ebt_counter *oldcounters,
-+ struct ebt_counter *counters, unsigned int nentries)
++static inline void nf_bridge_get(struct nf_bridge_info *nf_bridge)
+{
-+ int i, cpu;
-+ struct ebt_counter *counter_base;
-+
-+ // counters of cpu 0
-+ memcpy(counters, oldcounters,
-+ sizeof(struct ebt_counter) * nentries);
-+ // add other counters to those of cpu 0
-+ for (cpu = 1; cpu < smp_num_cpus; cpu++) {
-+ counter_base = COUNTER_BASE(oldcounters, nentries, cpu);
-+ for (i = 0; i < nentries; i++) {
-+ counters[i].pcnt += counter_base[i].pcnt;
-+ counters[i].bcnt += counter_base[i].bcnt;
-+ }
-+ }
++ if (nf_bridge)
++ atomic_inc(&nf_bridge->use);
+}
++#endif
+
-+// replace the table
-+static int do_replace(void *user, unsigned int len)
-+{
-+ int ret, i, countersize;
-+ struct ebt_table_info *newinfo;
-+ struct ebt_replace tmp;
-+ struct ebt_table *t;
-+ struct ebt_counter *counterstmp = NULL;
-+ // used to be able to unlock earlier
-+ struct ebt_table_info *table;
+ #endif
+
+ #endif /* __KERNEL__ */
+--- linux-2.4.21/net/core/netfilter.c Sat Aug 3 02:39:46 2002
++++ linux-2.4.21-ebt-brnf-3/net/core/netfilter.c Fri Aug 8 01:09:06 2003
+@@ -1,4 +1,4 @@
+-/* netfilter.c: look after the filters for various protocols.
++/* netfilter.c: look after the filters for various protocols.
+ * Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
+ *
+ * Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
+@@ -342,10 +342,15 @@ static unsigned int nf_iterate(struct li
+ const struct net_device *indev,
+ const struct net_device *outdev,
+ struct list_head **i,
+- int (*okfn)(struct sk_buff *))
++ int (*okfn)(struct sk_buff *),
++ int hook_thresh)
+ {
+ for (*i = (*i)->next; *i != head; *i = (*i)->next) {
+ struct nf_hook_ops *elem = (struct nf_hook_ops *)*i;
+
-+ if (copy_from_user(&tmp, user, sizeof(tmp)) != 0)
-+ return -EFAULT;
++ if (hook_thresh > elem->priority)
++ continue;
+
-+ if (len != sizeof(tmp) + tmp.entries_size) {
-+ BUGPRINT("Wrong len argument\n");
-+ return -EINVAL;
+ switch (elem->hook(hook, skb, indev, outdev, okfn)) {
+ case NF_QUEUE:
+ return NF_QUEUE;
+@@ -365,7 +370,7 @@ static unsigned int nf_iterate(struct li
+ break;
+
+ default:
+- NFDEBUG("Evil return from %p(%u).\n",
++ NFDEBUG("Evil return from %p(%u).\n",
+ elem->hook, hook);
+ #endif
+ }
+@@ -374,7 +379,7 @@ static unsigned int nf_iterate(struct li
+ }
+
+ int nf_register_queue_handler(int pf, nf_queue_outfn_t outfn, void *data)
+-{
++{
+ int ret;
+
+ br_write_lock_bh(BR_NETPROTO_LOCK);
+@@ -400,12 +405,12 @@ int nf_unregister_queue_handler(int pf)
+ return 0;
+ }
+
+-/*
+- * Any packet that leaves via this function must come back
++/*
++ * Any packet that leaves via this function must come back
+ * through nf_reinject().
+ */
+-static void nf_queue(struct sk_buff *skb,
+- struct list_head *elem,
++static void nf_queue(struct sk_buff *skb,
++ struct list_head *elem,
+ int pf, unsigned int hook,
+ struct net_device *indev,
+ struct net_device *outdev,
+@@ -413,6 +418,10 @@ static void nf_queue(struct sk_buff *skb
+ {
+ int status;
+ struct nf_info *info;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ struct net_device *physindev = NULL;
++ struct net_device *physoutdev = NULL;
++#endif
+
+ if (!queue_handler[pf].outfn) {
+ kfree_skb(skb);
+@@ -428,18 +437,31 @@ static void nf_queue(struct sk_buff *skb
+ return;
+ }
+
+- *info = (struct nf_info) {
++ *info = (struct nf_info) {
+ (struct nf_hook_ops *)elem, pf, hook, indev, outdev, okfn };
+
+ /* Bump dev refs so they don't vanish while packet is out */
+ if (indev) dev_hold(indev);
+ if (outdev) dev_hold(outdev);
+
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ if (skb->nf_bridge) {
++ physindev = skb->nf_bridge->physindev;
++ if (physindev) dev_hold(physindev);
++ physoutdev = skb->nf_bridge->physoutdev;
++ if (physoutdev) dev_hold(physoutdev);
+ }
++#endif
+
-+ if (tmp.entries_size == 0) {
-+ BUGPRINT("Entries_size never zero\n");
-+ return -EINVAL;
+ status = queue_handler[pf].outfn(skb, info, queue_handler[pf].data);
+ if (status < 0) {
+ /* James M doesn't say fuck enough. */
+ if (indev) dev_put(indev);
+ if (outdev) dev_put(outdev);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ if (physindev) dev_put(physindev);
++ if (physoutdev) dev_put(physoutdev);
++#endif
+ kfree(info);
+ kfree_skb(skb);
+ return;
+@@ -449,7 +471,8 @@ static void nf_queue(struct sk_buff *skb
+ int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
+ struct net_device *indev,
+ struct net_device *outdev,
+- int (*okfn)(struct sk_buff *))
++ int (*okfn)(struct sk_buff *),
++ int hook_thresh)
+ {
+ struct list_head *elem;
+ unsigned int verdict;
+@@ -481,7 +504,7 @@ int nf_hook_slow(int pf, unsigned int ho
+
+ elem = &nf_hooks[pf][hook];
+ verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev,
+- outdev, &elem, okfn);
++ outdev, &elem, okfn, hook_thresh);
+ if (verdict == NF_QUEUE) {
+ NFDEBUG("nf_hook: Verdict = QUEUE.\n");
+ nf_queue(skb, elem, pf, hook, indev, outdev, okfn);
+@@ -510,6 +533,14 @@ void nf_reinject(struct sk_buff *skb, st
+
+ /* We don't have BR_NETPROTO_LOCK here */
+ br_read_lock_bh(BR_NETPROTO_LOCK);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ if (skb->nf_bridge) {
++ if (skb->nf_bridge->physindev)
++ dev_put(skb->nf_bridge->physindev);
++ if (skb->nf_bridge->physoutdev)
++ dev_put(skb->nf_bridge->physoutdev);
+ }
-+ countersize = COUNTER_OFFSET(tmp.nentries) * smp_num_cpus;
-+ newinfo = (struct ebt_table_info *)
-+ vmalloc(sizeof(struct ebt_table_info) + countersize);
-+ if (!newinfo)
-+ return -ENOMEM;
++#endif
+ for (i = nf_hooks[info->pf][info->hook].next; i != elem; i = i->next) {
+ if (i == &nf_hooks[info->pf][info->hook]) {
+ /* The module which sent it to userspace is gone. */
+@@ -528,9 +559,9 @@ void nf_reinject(struct sk_buff *skb, st
+
+ if (verdict == NF_ACCEPT) {
+ verdict = nf_iterate(&nf_hooks[info->pf][info->hook],
+- &skb, info->hook,
++ &skb, info->hook,
+ info->indev, info->outdev, &elem,
+- info->okfn);
++ info->okfn, INT_MIN);
+ }
+
+ switch (verdict) {
+@@ -539,20 +570,19 @@ void nf_reinject(struct sk_buff *skb, st
+ break;
+
+ case NF_QUEUE:
+- nf_queue(skb, elem, info->pf, info->hook,
++ nf_queue(skb, elem, info->pf, info->hook,
+ info->indev, info->outdev, info->okfn);
+ break;
+-
+- case NF_DROP:
+- kfree_skb(skb);
+- break;
+ }
+ br_read_unlock_bh(BR_NETPROTO_LOCK);
+
+ /* Release those devices we held, or Alexey will kill me. */
+ if (info->indev) dev_put(info->indev);
+ if (info->outdev) dev_put(info->outdev);
+-
+
-+ if (countersize)
-+ memset(newinfo->counters, 0, countersize);
++ if (verdict == NF_DROP)
++ kfree_skb(skb);
+
-+ newinfo->entries = (char *)vmalloc(tmp.entries_size);
-+ if (!newinfo->entries) {
-+ ret = -ENOMEM;
-+ goto free_newinfo;
-+ }
-+ if (copy_from_user(
-+ newinfo->entries, tmp.entries, tmp.entries_size) != 0) {
-+ BUGPRINT("Couldn't copy entries from userspace\n");
-+ ret = -EFAULT;
-+ goto free_entries;
+ kfree(info);
+ return;
+ }
+--- linux-2.4.21/net/core/skbuff.c Fri Jun 13 16:51:39 2003
++++ linux-2.4.21-ebt-brnf-3/net/core/skbuff.c Fri Aug 8 01:09:06 2003
+@@ -245,6 +245,9 @@ static inline void skb_headerinit(void *
+ #ifdef CONFIG_NETFILTER_DEBUG
+ skb->nf_debug = 0;
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ skb->nf_bridge = NULL;
++#endif
+ #endif
+ #ifdef CONFIG_NET_SCHED
+ skb->tc_index = 0;
+@@ -325,6 +328,9 @@ void __kfree_skb(struct sk_buff *skb)
+ }
+ #ifdef CONFIG_NETFILTER
+ nf_conntrack_put(skb->nfct);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ nf_bridge_put(skb->nf_bridge);
++#endif
+ #endif
+ skb_headerinit(skb, NULL, 0); /* clean state */
+ kfree_skbmem(skb);
+@@ -391,6 +397,9 @@ struct sk_buff *skb_clone(struct sk_buff
+ #ifdef CONFIG_NETFILTER_DEBUG
+ C(nf_debug);
+ #endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ C(nf_bridge);
++#endif
+ #endif /*CONFIG_NETFILTER*/
+ #if defined(CONFIG_HIPPI)
+ C(private);
+@@ -403,6 +412,9 @@ struct sk_buff *skb_clone(struct sk_buff
+ skb->cloned = 1;
+ #ifdef CONFIG_NETFILTER
+ nf_conntrack_get(skb->nfct);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ nf_bridge_get(skb->nf_bridge);
++#endif
+ #endif
+ return n;
+ }
+@@ -436,6 +448,10 @@ static void copy_skb_header(struct sk_bu
+ nf_conntrack_get(new->nfct);
+ #ifdef CONFIG_NETFILTER_DEBUG
+ new->nf_debug=old->nf_debug;
++#endif
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ new->nf_bridge=old->nf_bridge;
++ nf_bridge_get(new->nf_bridge);
+ #endif
+ #endif
+ #ifdef CONFIG_NET_SCHED
+--- linux-2.4.21/net/ipv4/netfilter/ip_tables.c Fri Jun 13 16:51:39 2003
++++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/ip_tables.c Fri Aug 8 01:09:06 2003
+@@ -121,12 +121,19 @@ static LIST_HEAD(ipt_tables);
+ static inline int
+ ip_packet_match(const struct iphdr *ip,
+ const char *indev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ const char *physindev,
++#endif
+ const char *outdev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ const char *physoutdev,
++#endif
+ const struct ipt_ip *ipinfo,
+ int isfrag)
+ {
+ size_t i;
+ unsigned long ret;
++ unsigned long ret2 = 1;
+
+ #define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
+
+@@ -156,7 +163,15 @@ ip_packet_match(const struct iphdr *ip,
+ & ((const unsigned long *)ipinfo->iniface_mask)[i];
+ }
+
+- if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
++ ret2 |= (((const unsigned long *)physindev)[i]
++ ^ ((const unsigned long *)ipinfo->iniface)[i])
++ & ((const unsigned long *)ipinfo->iniface_mask)[i];
+ }
++#endif
+
-+ // the user wants counters back
-+ // the check on the size is done later, when we have the lock
-+ if (tmp.num_counters) {
-+ counterstmp = (struct ebt_counter *)
-+ vmalloc(tmp.num_counters * sizeof(struct ebt_counter));
-+ if (!counterstmp) {
-+ ret = -ENOMEM;
-+ goto free_entries;
-+ }
++ if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_IN)) {
+ dprintf("VIA in mismatch (%s vs %s).%s\n",
+ indev, ipinfo->iniface,
+ ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
+@@ -169,7 +184,15 @@ ip_packet_match(const struct iphdr *ip,
+ & ((const unsigned long *)ipinfo->outiface_mask)[i];
+ }
+
+- if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
++ ret2 |= (((const unsigned long *)physoutdev)[i]
++ ^ ((const unsigned long *)ipinfo->outiface)[i])
++ & ((const unsigned long *)ipinfo->outiface_mask)[i];
+ }
-+ else
-+ counterstmp = NULL;
-+
-+ // this can get initialized by translate_table()
-+ newinfo->chainstack = NULL;
-+ ret = translate_table(&tmp, newinfo);
-+
-+ if (ret != 0)
-+ goto free_counterstmp;
++#endif
+
-+ t = find_table_lock(tmp.name, &ret, &ebt_mutex);
-+ if (!t)
-+ goto free_iterate;
++ if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_OUT)) {
+ dprintf("VIA out mismatch (%s vs %s).%s\n",
+ outdev, ipinfo->outiface,
+ ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
+@@ -268,6 +291,9 @@ ipt_do_table(struct sk_buff **pskb,
+ /* Initializing verdict to NF_DROP keeps gcc happy. */
+ unsigned int verdict = NF_DROP;
+ const char *indev, *outdev;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ const char *physindev, *physoutdev;
++#endif
+ void *table_base;
+ struct ipt_entry *e, *back;
+
+@@ -277,6 +303,13 @@ ipt_do_table(struct sk_buff **pskb,
+ datalen = (*pskb)->len - ip->ihl * 4;
+ indev = in ? in->name : nulldevname;
+ outdev = out ? out->name : nulldevname;
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ physindev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physindev) ?
++ (*pskb)->nf_bridge->physindev->name : nulldevname;
++ physoutdev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physoutdev) ?
++ (*pskb)->nf_bridge->physoutdev->name : nulldevname;
++#endif
+
-+ // the table doesn't like it
-+ if (t->check && (ret = t->check(newinfo, tmp.valid_hooks)))
-+ goto free_unlock;
+ /* We handle fragments by dealing with the first fragment as
+ * if it was a normal packet. All other fragments are treated
+ * normally, except that they will NEVER match rules that ask
+@@ -312,7 +345,15 @@ ipt_do_table(struct sk_buff **pskb,
+ IP_NF_ASSERT(e);
+ IP_NF_ASSERT(back);
+ (*pskb)->nfcache |= e->nfcache;
+- if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
++ if (ip_packet_match(ip, indev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ physindev,
++#endif
++ outdev,
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ physoutdev,
++#endif
++ &e->ip, offset)) {
+ struct ipt_entry_target *t;
+
+ if (IPT_MATCH_ITERATE(e, do_match,
+--- linux-2.4.21/net/ipv4/ip_output.c Fri Nov 29 00:53:15 2002
++++ linux-2.4.21-ebt-brnf-3/net/ipv4/ip_output.c Fri Aug 8 01:09:06 2003
+@@ -879,6 +879,10 @@ int ip_fragment(struct sk_buff *skb, int
+ /* Connection association is same as pre-frag packet */
+ skb2->nfct = skb->nfct;
+ nf_conntrack_get(skb2->nfct);
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ skb2->nf_bridge = skb->nf_bridge;
++ nf_bridge_get(skb2->nf_bridge);
++#endif
+ #ifdef CONFIG_NETFILTER_DEBUG
+ skb2->nf_debug = skb->nf_debug;
+ #endif
+--- linux-2.4.21/net/ipv4/netfilter/ipt_LOG.c Mon Feb 25 20:38:14 2002
++++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/ipt_LOG.c Fri Aug 8 01:09:06 2003
+@@ -289,6 +289,18 @@ ipt_log_target(struct sk_buff **pskb,
+ loginfo->prefix,
+ in ? in->name : "",
+ out ? out->name : "");
++#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
++ if ((*pskb)->nf_bridge) {
++ struct net_device *physindev = (*pskb)->nf_bridge->physindev;
++ struct net_device *physoutdev = (*pskb)->nf_bridge->physoutdev;
+
-+ if (tmp.num_counters && tmp.num_counters != t->private->nentries) {
-+ BUGPRINT("Wrong nr. of counters requested\n");
-+ ret = -EINVAL;
-+ goto free_unlock;
++ if (physindev && in != physindev)
++ printk("PHYSIN=%s ", physindev->name);
++ if (physoutdev && out != physoutdev)
++ printk("PHYSOUT=%s ", physoutdev->name);
+ }
++#endif
+
-+ // we have the mutex lock, so no danger in reading this pointer
-+ table = t->private;
-+ // we need an atomic snapshot of the counters
-+ write_lock_bh(&t->lock);
-+ if (tmp.num_counters)
-+ get_counters(t->private->counters, counterstmp,
-+ t->private->nentries);
+ if (in && !out) {
+ /* MAC logging for input chain only. */
+ printk("MAC=");
+--- linux-2.4.21/net/ipv4/netfilter/Makefile Fri Jun 13 16:51:39 2003
++++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/Makefile Fri Aug 8 01:09:06 2003
+@@ -84,6 +84,8 @@ obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += i
+ obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
+ obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
+
++obj-$(CONFIG_IP_NF_MATCH_PHYSDEV) += ipt_physdev.o
+
-+ t->private = newinfo;
-+ write_unlock_bh(&t->lock);
-+ up(&ebt_mutex);
-+ // So, a user can change the chains while having messed up her counter
-+ // allocation. Only reason why this is done is because this way the lock
-+ // is held only once, while this doesn't bring the kernel into a
-+ // dangerous state.
-+ if (tmp.num_counters &&
-+ copy_to_user(tmp.counters, counterstmp,
-+ tmp.num_counters * sizeof(struct ebt_counter))) {
-+ BUGPRINT("Couldn't copy counters to userspace\n");
-+ ret = -EFAULT;
-+ }
-+ else
-+ ret = 0;
+ # targets
+ obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
+ obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
+@@ -100,6 +102,7 @@ obj-$(CONFIG_IP_NF_TARGET_TCPMSS) += ipt
+
+ # generic ARP tables
+ obj-$(CONFIG_IP_NF_ARPTABLES) += arp_tables.o
++obj-$(CONFIG_IP_NF_ARP_MANGLE) += arpt_mangle.o
+
+ # just filtering instance of ARP tables for now
+ obj-$(CONFIG_IP_NF_ARPFILTER) += arptable_filter.o
+--- linux-2.4.21/net/ipv4/netfilter/Config.in Fri Jun 13 16:51:39 2003
++++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/Config.in Fri Aug 8 01:09:06 2003
+@@ -43,6 +43,9 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
+ dep_tristate ' Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES
+ dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
+ fi
++ if [ "$CONFIG_BRIDGE" != "n" ]; then
++ dep_tristate ' Physdev match support' CONFIG_IP_NF_MATCH_PHYSDEV
++ fi
+ # The targets
+ dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES
+ if [ "$CONFIG_IP_NF_FILTER" != "n" ]; then
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/bridge/br_netfilter.c Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,636 @@
++/*
++ * Handle firewalling
++ * Linux ethernet bridge
++ *
++ * Authors:
++ * Lennert Buytenhek <buytenh@gnu.org>
++ * Bart De Schuymer <bdschuym@pandora.be>
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version
++ * 2 of the License, or (at your option) any later version.
++ *
++ * Lennert dedicates this file to Kerstin Wurdinger.
++ */
+
-+ // decrease module count and free resources
-+ EBT_ENTRY_ITERATE(table->entries, table->entries_size,
-+ ebt_cleanup_entry, NULL);
++#include <linux/module.h>
++#include <linux/kernel.h>
++#include <linux/ip.h>
++#include <linux/netdevice.h>
++#include <linux/skbuff.h>
++#include <linux/if_ether.h>
++#include <linux/netfilter_bridge.h>
++#include <linux/netfilter_ipv4.h>
++#include <linux/in_route.h>
++#include <net/ip.h>
++#include <asm/uaccess.h>
++#include <asm/checksum.h>
++#include "br_private.h"
+
-+ vfree(table->entries);
-+ if (table->chainstack) {
-+ for (i = 0; i < smp_num_cpus; i++)
-+ vfree(table->chainstack[i]);
-+ vfree(table->chainstack);
-+ }
-+ vfree(table);
+
-+ if (counterstmp)
-+ vfree(counterstmp);
-+ return ret;
++#define skb_origaddr(skb) (((struct bridge_skb_cb *) \
++ (skb->cb))->daddr.ipv4)
++#define store_orig_dstaddr(skb) (skb_origaddr(skb) = (skb)->nh.iph->daddr)
++#define dnat_took_place(skb) (skb_origaddr(skb) != (skb)->nh.iph->daddr)
++#define clear_cb(skb) (memset(&skb_origaddr(skb), 0, \
++ sizeof(struct bridge_skb_cb)))
+
-+free_unlock:
-+ up(&ebt_mutex);
-+free_iterate:
-+ EBT_ENTRY_ITERATE(newinfo->entries, newinfo->entries_size,
-+ ebt_cleanup_entry, NULL);
-+free_counterstmp:
-+ if (counterstmp)
-+ vfree(counterstmp);
-+ // can be initialized in translate_table()
-+ if (newinfo->chainstack) {
-+ for (i = 0; i < smp_num_cpus; i++)
-+ vfree(newinfo->chainstack[i]);
-+ vfree(newinfo->chainstack);
-+ }
-+free_entries:
-+ if (newinfo->entries)
-+ vfree(newinfo->entries);
-+free_newinfo:
-+ if (newinfo)
-+ vfree(newinfo);
-+ return ret;
-+}
++#define has_bridge_parent(device) ((device)->br_port != NULL)
++#define bridge_parent(device) (&((device)->br_port->br->dev))
+
-+int ebt_register_target(struct ebt_target *target)
-+{
-+ int ret;
++/* We need these fake structures to make netfilter happy --
++ * lots of places assume that skb->dst != NULL, which isn't
++ * all that unreasonable.
++ *
++ * Currently, we fill in the PMTU entry because netfilter
++ * refragmentation needs it, and the rt_flags entry because
++ * ipt_REJECT needs it. Future netfilter modules might
++ * require us to fill additional fields.
++ */
++static struct net_device __fake_net_device = {
++ .hard_header_len = ETH_HLEN
++};
+
-+ ret = down_interruptible(&ebt_mutex);
-+ if (ret != 0)
-+ return ret;
-+ if (!list_named_insert(&ebt_targets, target)) {
-+ up(&ebt_mutex);
-+ return -EEXIST;
-+ }
-+ up(&ebt_mutex);
-+ MOD_INC_USE_COUNT;
++static struct rtable __fake_rtable = {
++ u: {
++ dst: {
++ __refcnt: ATOMIC_INIT(1),
++ dev: &__fake_net_device,
++ pmtu: 1500
++ }
++ },
+
-+ return 0;
-+}
++ rt_flags: 0
++};
+
-+void ebt_unregister_target(struct ebt_target *target)
-+{
-+ down(&ebt_mutex);
-+ LIST_DELETE(&ebt_targets, target);
-+ up(&ebt_mutex);
-+ MOD_DEC_USE_COUNT;
-+}
+
-+int ebt_register_match(struct ebt_match *match)
++/* PF_BRIDGE/PRE_ROUTING *********************************************/
++static void __br_dnat_complain(void)
+{
-+ int ret;
++ static unsigned long last_complaint = 0;
+
-+ ret = down_interruptible(&ebt_mutex);
-+ if (ret != 0)
-+ return ret;
-+ if (!list_named_insert(&ebt_matches, match)) {
-+ up(&ebt_mutex);
-+ return -EEXIST;
++ if (jiffies - last_complaint >= 5 * HZ) {
++ printk(KERN_WARNING "Performing cross-bridge DNAT requires IP "
++ "forwarding to be enabled\n");
++ last_complaint = jiffies;
+ }
-+ up(&ebt_mutex);
-+ MOD_INC_USE_COUNT;
-+
-+ return 0;
+}
+
-+void ebt_unregister_match(struct ebt_match *match)
-+{
-+ down(&ebt_mutex);
-+ LIST_DELETE(&ebt_matches, match);
-+ up(&ebt_mutex);
-+ MOD_DEC_USE_COUNT;
-+}
+
-+int ebt_register_watcher(struct ebt_watcher *watcher)
++/* This requires some explaining. If DNAT has taken place,
++ * we will need to fix up the destination Ethernet address,
++ * and this is a tricky process.
++ *
++ * There are two cases to consider:
++ * 1. The packet was DNAT'ed to a device in the same bridge
++ * port group as it was received on. We can still bridge
++ * the packet.
++ * 2. The packet was DNAT'ed to a different device, either
++ * a non-bridged device or another bridge port group.
++ * The packet will need to be routed.
++ *
++ * The correct way of distinguishing between these two cases is to
++ * call ip_route_input() and to look at skb->dst->dev, which is
++ * changed to the destination device if ip_route_input() succeeds.
++ *
++ * Let us first consider the case that ip_route_input() succeeds:
++ *
++ * If skb->dst->dev equals the logical bridge device the packet
++ * came in on, we can consider this bridging. We then call
++ * skb->dst->output() which will make the packet enter br_nf_local_out()
++ * not much later. In that function it is assured that the iptables
++ * FORWARD chain is traversed for the packet.
++ *
++ * Otherwise, the packet is considered to be routed and we just
++ * change the destination MAC address so that the packet will
++ * later be passed up to the IP stack to be routed.
++ *
++ * Let us now consider the case that ip_route_input() fails:
++ *
++ * After a "echo '0' > /proc/sys/net/ipv4/ip_forward" ip_route_input()
++ * will fail, while __ip_route_output_key() will return success. The source
++ * address for __ip_route_output_key() is set to zero, so __ip_route_output_key
++ * thinks we're handling a locally generated packet and won't care
++ * if IP forwarding is allowed. We send a warning message to the users's
++ * log telling her to put IP forwarding on.
++ *
++ * ip_route_input() will also fail if there is no route available.
++ * In that case we just drop the packet.
++ *
++ * --Lennert, 20020411
++ * --Bart, 20020416 (updated)
++ * --Bart, 20021007 (updated)
++ */
++
++static int br_nf_pre_routing_finish_bridge(struct sk_buff *skb)
+{
-+ int ret;
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug |= (1 << NF_BR_PRE_ROUTING) | (1 << NF_BR_FORWARD);
++#endif
+
-+ ret = down_interruptible(&ebt_mutex);
-+ if (ret != 0)
-+ return ret;
-+ if (!list_named_insert(&ebt_watchers, watcher)) {
-+ up(&ebt_mutex);
-+ return -EEXIST;
++ if (skb->pkt_type == PACKET_OTHERHOST) {
++ skb->pkt_type = PACKET_HOST;
++ skb->nf_bridge->mask |= BRNF_PKT_TYPE;
+ }
-+ up(&ebt_mutex);
-+ MOD_INC_USE_COUNT;
+
++ skb->dev = bridge_parent(skb->dev);
++ skb->dst->output(skb);
+ return 0;
+}
+
-+void ebt_unregister_watcher(struct ebt_watcher *watcher)
++static int br_nf_pre_routing_finish(struct sk_buff *skb)
+{
-+ down(&ebt_mutex);
-+ LIST_DELETE(&ebt_watchers, watcher);
-+ up(&ebt_mutex);
-+ MOD_DEC_USE_COUNT;
-+}
++ struct net_device *dev = skb->dev;
++ struct iphdr *iph = skb->nh.iph;
++ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+
-+int ebt_register_table(struct ebt_table *table)
-+{
-+ struct ebt_table_info *newinfo;
-+ int ret, i, countersize;
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug ^= (1 << NF_BR_PRE_ROUTING);
++#endif
+
-+ if (!table || !table->table ||!table->table->entries ||
-+ table->table->entries_size == 0 ||
-+ table->table->counters || table->private) {
-+ BUGPRINT("Bad table data for ebt_register_table!!!\n");
-+ return -EINVAL;
++ if (nf_bridge->mask & BRNF_PKT_TYPE) {
++ skb->pkt_type = PACKET_OTHERHOST;
++ nf_bridge->mask ^= BRNF_PKT_TYPE;
+ }
+
-+ countersize = COUNTER_OFFSET(table->table->nentries) * smp_num_cpus;
-+ newinfo = (struct ebt_table_info *)
-+ vmalloc(sizeof(struct ebt_table_info) + countersize);
-+ ret = -ENOMEM;
-+ if (!newinfo)
-+ return -ENOMEM;
-+
-+ newinfo->entries = (char *)vmalloc(table->table->entries_size);
-+ if (!(newinfo->entries))
-+ goto free_newinfo;
-+
-+ memcpy(newinfo->entries, table->table->entries,
-+ table->table->entries_size);
-+
-+ if (countersize)
-+ memset(newinfo->counters, 0, countersize);
-+
-+ // fill in newinfo and parse the entries
-+ newinfo->chainstack = NULL;
-+ ret = translate_table(table->table, newinfo);
-+ if (ret != 0) {
-+ BUGPRINT("Translate_table failed\n");
-+ goto free_chainstack;
-+ }
++ if (dnat_took_place(skb)) {
++ if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
++ dev)) {
++ struct rtable *rt;
+
-+ if (table->check && table->check(newinfo, table->valid_hooks)) {
-+ BUGPRINT("The table doesn't like its own initial data, lol\n");
-+ return -EINVAL;
++ if (!ip_route_output(&rt, iph->daddr, 0, iph->tos, 0)) {
++ /* Bridged-and-DNAT'ed traffic doesn't
++ * require ip_forwarding.
++ */
++ if (((struct dst_entry *)rt)->dev == dev) {
++ skb->dst = (struct dst_entry *)rt;
++ goto bridged_dnat;
++ }
++ __br_dnat_complain();
++ dst_release((struct dst_entry *)rt);
++ }
++ kfree_skb(skb);
++ return 0;
++ } else {
++ if (skb->dst->dev == dev) {
++bridged_dnat:
++ /* Tell br_nf_local_out this is a
++ * bridged frame
++ */
++ nf_bridge->mask |= BRNF_BRIDGED_DNAT;
++ skb->dev = nf_bridge->physindev;
++ clear_cb(skb);
++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING,
++ skb, skb->dev, NULL,
++ br_nf_pre_routing_finish_bridge,
++ 1);
++ return 0;
++ }
++ memcpy(skb->mac.ethernet->h_dest, dev->dev_addr,
++ ETH_ALEN);
++ }
++ } else {
++ skb->dst = (struct dst_entry *)&__fake_rtable;
++ dst_hold(skb->dst);
+ }
+
-+ table->private = newinfo;
-+ table->lock = RW_LOCK_UNLOCKED;
-+ ret = down_interruptible(&ebt_mutex);
-+ if (ret != 0)
-+ goto free_chainstack;
-+
-+ if (list_named_find(&ebt_tables, table->name)) {
-+ ret = -EEXIST;
-+ BUGPRINT("Table name already exists\n");
-+ goto free_unlock;
-+ }
++ clear_cb(skb);
++ skb->dev = nf_bridge->physindev;
++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
++ br_handle_frame_finish, 1);
+
-+ list_prepend(&ebt_tables, table);
-+ up(&ebt_mutex);
-+ MOD_INC_USE_COUNT;
+ return 0;
-+free_unlock:
-+ up(&ebt_mutex);
-+free_chainstack:
-+ if (newinfo->chainstack) {
-+ for (i = 0; i < smp_num_cpus; i++)
-+ vfree(newinfo->chainstack[i]);
-+ vfree(newinfo->chainstack);
-+ }
-+ vfree(newinfo->entries);
-+free_newinfo:
-+ vfree(newinfo);
-+ return ret;
+}
+
-+void ebt_unregister_table(struct ebt_table *table)
++/* Replicate the checks that IPv4 does on packet reception.
++ * Set skb->dev to the bridge device (i.e. parent of the
++ * receiving device) to make netfilter happy, the REDIRECT
++ * target in particular. Save the original destination IP
++ * address to be able to detect DNAT afterwards.
++ */
++static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*okfn)(struct sk_buff *))
+{
-+ int i;
++ struct iphdr *iph;
++ __u32 len;
++ struct sk_buff *skb;
++ struct nf_bridge_info *nf_bridge;
+
-+ if (!table) {
-+ BUGPRINT("Request to unregister NULL table!!!\n");
-+ return;
-+ }
-+ down(&ebt_mutex);
-+ LIST_DELETE(&ebt_tables, table);
-+ up(&ebt_mutex);
-+ EBT_ENTRY_ITERATE(table->private->entries,
-+ table->private->entries_size, ebt_cleanup_entry, NULL);
-+ if (table->private->entries)
-+ vfree(table->private->entries);
-+ if (table->private->chainstack) {
-+ for (i = 0; i < smp_num_cpus; i++)
-+ vfree(table->private->chainstack[i]);
-+ vfree(table->private->chainstack);
-+ }
-+ vfree(table->private);
-+ MOD_DEC_USE_COUNT;
-+}
++ if ((*pskb)->protocol != __constant_htons(ETH_P_IP))
++ return NF_ACCEPT;
+
-+// userspace just supplied us with counters
-+static int update_counters(void *user, unsigned int len)
-+{
-+ int i, ret;
-+ struct ebt_counter *tmp;
-+ struct ebt_replace hlp;
-+ struct ebt_table *t;
++ if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL)
++ goto out;
+
-+ if (copy_from_user(&hlp, user, sizeof(hlp)))
-+ return -EFAULT;
++ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
++ goto inhdr_error;
+
-+ if (len != sizeof(hlp) + hlp.num_counters * sizeof(struct ebt_counter))
-+ return -EINVAL;
-+ if (hlp.num_counters == 0)
-+ return -EINVAL;
++ iph = skb->nh.iph;
++ if (iph->ihl < 5 || iph->version != 4)
++ goto inhdr_error;
+
-+ if ( !(tmp = (struct ebt_counter *)
-+ vmalloc(hlp.num_counters * sizeof(struct ebt_counter))) ){
-+ MEMPRINT("Update_counters && nomemory\n");
-+ return -ENOMEM;
-+ }
++ if (!pskb_may_pull(skb, 4*iph->ihl))
++ goto inhdr_error;
+
-+ t = find_table_lock(hlp.name, &ret, &ebt_mutex);
-+ if (!t)
-+ goto free_tmp;
++ iph = skb->nh.iph;
++ if (ip_fast_csum((__u8 *)iph, iph->ihl) != 0)
++ goto inhdr_error;
+
-+ if (hlp.num_counters != t->private->nentries) {
-+ BUGPRINT("Wrong nr of counters\n");
-+ ret = -EINVAL;
-+ goto unlock_mutex;
++ len = ntohs(iph->tot_len);
++ if (skb->len < len || len < 4*iph->ihl)
++ goto inhdr_error;
++
++ if (skb->len > len) {
++ __pskb_trim(skb, len);
++ if (skb->ip_summed == CHECKSUM_HW)
++ skb->ip_summed = CHECKSUM_NONE;
+ }
+
-+ if ( copy_from_user(tmp, hlp.counters,
-+ hlp.num_counters * sizeof(struct ebt_counter)) ) {
-+ BUGPRINT("Updata_counters && !cfu\n");
-+ ret = -EFAULT;
-+ goto unlock_mutex;
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug ^= (1 << NF_IP_PRE_ROUTING);
++#endif
++ if ((nf_bridge = nf_bridge_alloc(skb)) == NULL)
++ return NF_DROP;
++
++ if (skb->pkt_type == PACKET_OTHERHOST) {
++ skb->pkt_type = PACKET_HOST;
++ nf_bridge->mask |= BRNF_PKT_TYPE;
+ }
+
-+ // we want an atomic add of the counters
-+ write_lock_bh(&t->lock);
++ nf_bridge->physindev = skb->dev;
++ skb->dev = bridge_parent(skb->dev);
++ store_orig_dstaddr(skb);
++
++ NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
++ br_nf_pre_routing_finish);
++
++ return NF_STOLEN;
++
++inhdr_error:
++// IP_INC_STATS_BH(IpInHdrErrors);
++out:
++ return NF_DROP;
++}
++
++
++/* PF_BRIDGE/LOCAL_IN ************************************************/
++/* The packet is locally destined, which requires a real
++ * dst_entry, so detach the fake one. On the way up, the
++ * packet would pass through PRE_ROUTING again (which already
++ * took place when the packet entered the bridge), but we
++ * register an IPv4 PRE_ROUTING 'sabotage' hook that will
++ * prevent this from happening.
++ */
++static unsigned int br_nf_local_in(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*okfn)(struct sk_buff *))
++{
++ struct sk_buff *skb = *pskb;
++
++ if (skb->protocol != __constant_htons(ETH_P_IP))
++ return NF_ACCEPT;
+
-+ // we add to the counters of the first cpu
-+ for (i = 0; i < hlp.num_counters; i++) {
-+ t->private->counters[i].pcnt += tmp[i].pcnt;
-+ t->private->counters[i].bcnt += tmp[i].bcnt;
++ if (skb->dst == (struct dst_entry *)&__fake_rtable) {
++ dst_release(skb->dst);
++ skb->dst = NULL;
+ }
+
-+ write_unlock_bh(&t->lock);
-+ ret = 0;
-+unlock_mutex:
-+ up(&ebt_mutex);
-+free_tmp:
-+ vfree(tmp);
-+ return ret;
++ return NF_ACCEPT;
+}
+
-+static inline int ebt_make_matchname(struct ebt_entry_match *m,
-+ char *base, char *ubase)
-+{
-+ char *hlp = ubase - base + (char *)m;
-+ if (copy_to_user(hlp, m->u.match->name, EBT_FUNCTION_MAXNAMELEN))
-+ return -EFAULT;
-+ return 0;
-+}
+
-+static inline int ebt_make_watchername(struct ebt_entry_watcher *w,
-+ char *base, char *ubase)
++/* PF_BRIDGE/FORWARD *************************************************/
++static int br_nf_forward_finish(struct sk_buff *skb)
+{
-+ char *hlp = ubase - base + (char *)w;
-+ if (copy_to_user(hlp , w->u.watcher->name, EBT_FUNCTION_MAXNAMELEN))
-+ return -EFAULT;
-+ return 0;
-+}
++ struct nf_bridge_info *nf_bridge = skb->nf_bridge;
+
-+static inline int ebt_make_names(struct ebt_entry *e, char *base, char *ubase)
-+{
-+ int ret;
-+ char *hlp;
-+ struct ebt_entry_target *t;
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug ^= (1 << NF_BR_FORWARD);
++#endif
+
-+ if ((e->bitmask & EBT_ENTRY_OR_ENTRIES) == 0)
-+ return 0;
++ if (nf_bridge->mask & BRNF_PKT_TYPE) {
++ skb->pkt_type = PACKET_OTHERHOST;
++ nf_bridge->mask ^= BRNF_PKT_TYPE;
++ }
++
++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_FORWARD, skb, nf_bridge->physindev,
++ skb->dev, br_forward_finish, 1);
+
-+ hlp = ubase - base + (char *)e + e->target_offset;
-+ t = (struct ebt_entry_target *)(((char *)e) + e->target_offset);
-+
-+ ret = EBT_MATCH_ITERATE(e, ebt_make_matchname, base, ubase);
-+ if (ret != 0)
-+ return ret;
-+ ret = EBT_WATCHER_ITERATE(e, ebt_make_watchername, base, ubase);
-+ if (ret != 0)
-+ return ret;
-+ if (copy_to_user(hlp, t->u.target->name, EBT_FUNCTION_MAXNAMELEN))
-+ return -EFAULT;
+ return 0;
+}
+
-+// called with ebt_mutex down
-+static int copy_everything_to_user(struct ebt_table *t, void *user,
-+ int *len, int cmd)
++/* This is the 'purely bridged' case. We pass the packet to
++ * netfilter with indev and outdev set to the bridge device,
++ * but we are still able to filter on the 'real' indev/outdev
++ * because of the ipt_physdev.c module.
++ */
++static unsigned int br_nf_forward(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*okfn)(struct sk_buff *))
+{
-+ struct ebt_replace tmp;
-+ struct ebt_counter *counterstmp, *oldcounters;
-+ unsigned int entries_size, nentries;
-+ char *entries;
-+
-+ if (cmd == EBT_SO_GET_ENTRIES) {
-+ entries_size = t->private->entries_size;
-+ nentries = t->private->nentries;
-+ entries = t->private->entries;
-+ oldcounters = t->private->counters;
-+ } else {
-+ entries_size = t->table->entries_size;
-+ nentries = t->table->nentries;
-+ entries = t->table->entries;
-+ oldcounters = t->table->counters;
-+ }
-+
-+ if (copy_from_user(&tmp, user, sizeof(tmp))) {
-+ BUGPRINT("Cfu didn't work\n");
-+ return -EFAULT;
-+ }
++ struct sk_buff *skb = *pskb;
++ struct nf_bridge_info *nf_bridge;
+
-+ if (*len != sizeof(struct ebt_replace) + entries_size +
-+ (tmp.num_counters? nentries * sizeof(struct ebt_counter): 0)) {
-+ BUGPRINT("Wrong size\n");
-+ return -EINVAL;
-+ }
++ if (skb->protocol != __constant_htons(ETH_P_IP))
++ return NF_ACCEPT;
+
-+ if (tmp.nentries != nentries) {
-+ BUGPRINT("Nentries wrong\n");
-+ return -EINVAL;
-+ }
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug ^= (1 << NF_BR_FORWARD);
++#endif
+
-+ if (tmp.entries_size != entries_size) {
-+ BUGPRINT("Wrong size\n");
-+ return -EINVAL;
++ nf_bridge = skb->nf_bridge;
++ if (skb->pkt_type == PACKET_OTHERHOST) {
++ skb->pkt_type = PACKET_HOST;
++ nf_bridge->mask |= BRNF_PKT_TYPE;
+ }
+
-+ // userspace might not need the counters
-+ if (tmp.num_counters) {
-+ if (tmp.num_counters != nentries) {
-+ BUGPRINT("Num_counters wrong\n");
-+ return -EINVAL;
-+ }
-+ counterstmp = (struct ebt_counter *)
-+ vmalloc(nentries * sizeof(struct ebt_counter));
-+ if (!counterstmp) {
-+ MEMPRINT("Couldn't copy counters, out of memory\n");
-+ return -ENOMEM;
-+ }
-+ write_lock_bh(&t->lock);
-+ get_counters(oldcounters, counterstmp, nentries);
-+ write_unlock_bh(&t->lock);
++ nf_bridge->mask |= BRNF_BRIDGED; /* The physdev module checks on this */
++ nf_bridge->physoutdev = skb->dev;
+
-+ if (copy_to_user(tmp.counters, counterstmp,
-+ nentries * sizeof(struct ebt_counter))) {
-+ BUGPRINT("Couldn't copy counters to userspace\n");
-+ vfree(counterstmp);
-+ return -EFAULT;
-+ }
-+ vfree(counterstmp);
-+ }
++ NF_HOOK(PF_INET, NF_IP_FORWARD, skb, bridge_parent(nf_bridge->physindev),
++ bridge_parent(skb->dev), br_nf_forward_finish);
+
-+ if (copy_to_user(tmp.entries, entries, entries_size)) {
-+ BUGPRINT("Couldn't copy entries to userspace\n");
-+ return -EFAULT;
-+ }
-+ // set the match/watcher/target names right
-+ return EBT_ENTRY_ITERATE(entries, entries_size,
-+ ebt_make_names, entries, tmp.entries);
++ return NF_STOLEN;
+}
+
-+static int do_ebt_set_ctl(struct sock *sk,
-+ int cmd, void *user, unsigned int len)
++
++/* PF_BRIDGE/LOCAL_OUT ***********************************************/
++static int br_nf_local_out_finish(struct sk_buff *skb)
+{
-+ int ret;
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug &= ~(1 << NF_BR_LOCAL_OUT);
++#endif
+
-+ switch(cmd) {
-+ case EBT_SO_SET_ENTRIES:
-+ ret = do_replace(user, len);
-+ break;
-+ case EBT_SO_SET_COUNTERS:
-+ ret = update_counters(user, len);
-+ break;
-+ default:
-+ ret = -EINVAL;
-+ }
-+ return ret;
++ NF_HOOK_THRESH(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
++ br_forward_finish, NF_BR_PRI_FIRST + 1);
++
++ return 0;
+}
+
-+static int do_ebt_get_ctl(struct sock *sk, int cmd, void *user, int *len)
-+{
-+ int ret;
-+ struct ebt_replace tmp;
-+ struct ebt_table *t;
+
-+ if (copy_from_user(&tmp, user, sizeof(tmp)))
-+ return -EFAULT;
++/* This function sees both locally originated IP packets and forwarded
++ * IP packets (in both cases the destination device is a bridge
++ * device). It also sees bridged-and-DNAT'ed packets.
++ * To be able to filter on the physical bridge devices (with the ipt_physdev.c
++ * module), we steal packets destined to a bridge device away from the
++ * PF_INET/FORWARD and PF_INET/OUTPUT hook functions, and give them back later,
++ * when we have determined the real output device. This is done in here.
++ *
++ * If (nf_bridge->mask & BRNF_BRIDGED_DNAT) then the packet is bridged
++ * and we fake the PF_BRIDGE/FORWARD hook. The function br_nf_forward()
++ * will then fake the PF_INET/FORWARD hook. br_nf_local_out() has priority
++ * NF_BR_PRI_FIRST, so no relevant PF_BRIDGE/INPUT functions have been nor
++ * will be executed.
++ * Otherwise, if nf_bridge->physindev is NULL, the bridge-nf code never touched
++ * this packet before, and so the packet was locally originated. We fake
++ * the PF_INET/LOCAL_OUT hook.
++ * Finally, if nf_bridge->physindev isn't NULL, then the packet was IP routed,
++ * so we fake the PF_INET/FORWARD hook. ipv4_sabotage_out() makes sure
++ * even routed packets that didn't arrive on a bridge interface have their
++ * nf_bridge->physindev set.
++ */
+
-+ t = find_table_lock(tmp.name, &ret, &ebt_mutex);
-+ if (!t)
-+ return ret;
++static unsigned int br_nf_local_out(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*_okfn)(struct sk_buff *))
++{
++ int (*okfn)(struct sk_buff *skb);
++ struct net_device *realindev;
++ struct sk_buff *skb = *pskb;
++ struct nf_bridge_info *nf_bridge;
+
-+ switch(cmd) {
-+ case EBT_SO_GET_INFO:
-+ case EBT_SO_GET_INIT_INFO:
-+ if (*len != sizeof(struct ebt_replace)){
-+ ret = -EINVAL;
-+ up(&ebt_mutex);
-+ break;
-+ }
-+ if (cmd == EBT_SO_GET_INFO) {
-+ tmp.nentries = t->private->nentries;
-+ tmp.entries_size = t->private->entries_size;
-+ tmp.valid_hooks = t->valid_hooks;
-+ } else {
-+ tmp.nentries = t->table->nentries;
-+ tmp.entries_size = t->table->entries_size;
-+ tmp.valid_hooks = t->table->valid_hooks;
-+ }
-+ up(&ebt_mutex);
-+ if (copy_to_user(user, &tmp, *len) != 0){
-+ BUGPRINT("c2u Didn't work\n");
-+ ret = -EFAULT;
-+ break;
-+ }
-+ ret = 0;
-+ break;
++ if (skb->protocol != __constant_htons(ETH_P_IP))
++ return NF_ACCEPT;
+
-+ case EBT_SO_GET_ENTRIES:
-+ case EBT_SO_GET_INIT_ENTRIES:
-+ ret = copy_everything_to_user(t, user, len, cmd);
-+ up(&ebt_mutex);
-+ break;
++ /* Sometimes we get packets with NULL ->dst here (for example,
++ * running a dhcp client daemon triggers this).
++ */
++ if (skb->dst == NULL)
++ return NF_ACCEPT;
+
-+ default:
-+ up(&ebt_mutex);
-+ ret = -EINVAL;
-+ }
++ nf_bridge = skb->nf_bridge;
++ nf_bridge->physoutdev = skb->dev;
+
-+ return ret;
-+}
++ realindev = nf_bridge->physindev;
++
++ /* Bridged, take PF_BRIDGE/FORWARD.
++ * (see big note in front of br_nf_pre_routing_finish)
++ */
++ if (nf_bridge->mask & BRNF_BRIDGED_DNAT) {
++ okfn = br_forward_finish;
+
-+static struct nf_sockopt_ops ebt_sockopts =
-+{ { NULL, NULL }, PF_INET, EBT_BASE_CTL, EBT_SO_SET_MAX + 1, do_ebt_set_ctl,
-+ EBT_BASE_CTL, EBT_SO_GET_MAX + 1, do_ebt_get_ctl, 0, NULL
-+};
++ if (nf_bridge->mask & BRNF_PKT_TYPE) {
++ skb->pkt_type = PACKET_OTHERHOST;
++ nf_bridge->mask ^= BRNF_PKT_TYPE;
++ }
+
-+static int __init init(void)
-+{
-+ int ret;
++ NF_HOOK(PF_BRIDGE, NF_BR_FORWARD, skb, realindev,
++ skb->dev, okfn);
++ } else {
++ okfn = br_nf_local_out_finish;
++ /* IP forwarded traffic has a physindev, locally
++ * generated traffic hasn't.
++ */
++ if (realindev != NULL) {
++ if (((nf_bridge->mask & BRNF_DONT_TAKE_PARENT) == 0) &&
++ has_bridge_parent(realindev))
++ realindev = bridge_parent(realindev);
+
-+ down(&ebt_mutex);
-+ list_named_insert(&ebt_targets, &ebt_standard_target);
-+ up(&ebt_mutex);
-+ if ((ret = nf_register_sockopt(&ebt_sockopts)) < 0)
-+ return ret;
++ NF_HOOK_THRESH(PF_INET, NF_IP_FORWARD, skb, realindev,
++ bridge_parent(skb->dev), okfn,
++ NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD + 1);
++ } else {
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug ^= (1 << NF_IP_LOCAL_OUT);
++#endif
+
-+ printk(KERN_NOTICE "Ebtables v2.0 registered\n");
-+ return 0;
-+}
++ NF_HOOK_THRESH(PF_INET, NF_IP_LOCAL_OUT, skb, realindev,
++ bridge_parent(skb->dev), okfn,
++ NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT + 1);
++ }
++ }
+
-+static void __exit fini(void)
-+{
-+ nf_unregister_sockopt(&ebt_sockopts);
-+ printk(KERN_NOTICE "Ebtables v2.0 unregistered\n");
++ return NF_STOLEN;
+}
+
-+EXPORT_SYMBOL(ebt_register_table);
-+EXPORT_SYMBOL(ebt_unregister_table);
-+EXPORT_SYMBOL(ebt_register_match);
-+EXPORT_SYMBOL(ebt_unregister_match);
-+EXPORT_SYMBOL(ebt_register_watcher);
-+EXPORT_SYMBOL(ebt_unregister_watcher);
-+EXPORT_SYMBOL(ebt_register_target);
-+EXPORT_SYMBOL(ebt_unregister_target);
-+EXPORT_SYMBOL(ebt_do_table);
-+module_init(init);
-+module_exit(fini);
-+MODULE_LICENSE("GPL");
-diff -Nurb linux.stock/net/core/dev.c linux/net/core/dev.c
---- linux.stock/net/core/dev.c 2003-10-14 04:02:55.000000000 -0400
-+++ linux/net/core/dev.c 2004-07-10 23:46:39.000000000 -0400
-@@ -1393,7 +1393,7 @@
-
-
- #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
--void (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
-+int (*br_handle_frame_hook)(struct sk_buff *skb) = NULL;
- #endif
-
- static __inline__ int handle_bridge(struct sk_buff *skb,
-@@ -1410,7 +1410,6 @@
- }
- }
-
-- br_handle_frame_hook(skb);
- return ret;
- }
-
-@@ -1470,7 +1469,12 @@
- #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
- if (skb->dev->br_port != NULL &&
- br_handle_frame_hook != NULL) {
-- return handle_bridge(skb, pt_prev);
-+ int ret;
-+
-+ ret = handle_bridge(skb, pt_prev);
-+ if (br_handle_frame_hook(skb) == 0)
-+ return ret;
-+ pt_prev = NULL;
- }
- #endif
-
-diff -Nurb linux.stock/net/core/netfilter.c linux/net/core/netfilter.c
---- linux.stock/net/core/netfilter.c 2004-07-10 23:29:56.000000000 -0400
-+++ linux/net/core/netfilter.c 2004-07-10 23:46:39.000000000 -0400
-@@ -344,10 +344,15 @@
- const struct net_device *indev,
- const struct net_device *outdev,
- struct list_head **i,
-- int (*okfn)(struct sk_buff *))
-+ int (*okfn)(struct sk_buff *),
-+ int hook_thresh)
- {
- for (*i = (*i)->next; *i != head; *i = (*i)->next) {
- struct nf_hook_ops *elem = (struct nf_hook_ops *)*i;
+
-+ if (hook_thresh > elem->priority)
-+ continue;
++/* PF_BRIDGE/POST_ROUTING ********************************************/
++static unsigned int br_nf_post_routing(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*okfn)(struct sk_buff *))
++{
++ struct sk_buff *skb = *pskb;
++ struct nf_bridge_info *nf_bridge = (*pskb)->nf_bridge;
+
- switch (elem->hook(hook, skb, indev, outdev, okfn)) {
- case NF_QUEUE:
- return NF_QUEUE;
-@@ -415,6 +420,10 @@
- {
- int status;
- struct nf_info *info;
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ struct net_device *physindev = NULL;
-+ struct net_device *physoutdev = NULL;
-+#endif
-
- if (!queue_handler[pf].outfn) {
- kfree_skb(skb);
-@@ -437,11 +446,24 @@
- if (indev) dev_hold(indev);
- if (outdev) dev_hold(outdev);
-
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ if (skb->nf_bridge) {
-+ physindev = skb->nf_bridge->physindev;
-+ if (physindev) dev_hold(physindev);
-+ physoutdev = skb->nf_bridge->physoutdev;
-+ if (physoutdev) dev_hold(physoutdev);
++ /* Be very paranoid. Must be a device driver bug. */
++ if (skb->mac.raw < skb->head || skb->mac.raw + ETH_HLEN > skb->data) {
++ printk(KERN_CRIT "br_netfilter: Argh!! br_nf_post_routing: "
++ "bad mac.raw pointer.");
++ if (skb->dev != NULL) {
++ printk("[%s]", skb->dev->name);
++ if (has_bridge_parent(skb->dev))
++ printk("[%s]", bridge_parent(skb->dev)->name);
++ }
++ printk("\n");
++ return NF_ACCEPT;
+ }
-+#endif
+
- status = queue_handler[pf].outfn(skb, info, queue_handler[pf].data);
- if (status < 0) {
- /* James M doesn't say fuck enough. */
- if (indev) dev_put(indev);
- if (outdev) dev_put(outdev);
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ if (physindev) dev_put(physindev);
-+ if (physoutdev) dev_put(physoutdev);
-+#endif
- kfree(info);
- kfree_skb(skb);
- return;
-@@ -451,7 +473,8 @@
- int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb,
- struct net_device *indev,
- struct net_device *outdev,
-- int (*okfn)(struct sk_buff *))
-+ int (*okfn)(struct sk_buff *),
-+ int hook_thresh)
- {
- struct list_head *elem;
- unsigned int verdict;
-@@ -483,7 +506,7 @@
-
- elem = &nf_hooks[pf][hook];
- verdict = nf_iterate(&nf_hooks[pf][hook], &skb, hook, indev,
-- outdev, &elem, okfn);
-+ outdev, &elem, okfn, hook_thresh);
- if (verdict == NF_QUEUE) {
- NFDEBUG("nf_hook: Verdict = QUEUE.\n");
- nf_queue(skb, elem, pf, hook, indev, outdev, okfn);
-@@ -512,6 +535,14 @@
-
- /* We don't have BR_NETPROTO_LOCK here */
- br_read_lock_bh(BR_NETPROTO_LOCK);
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ if (skb->nf_bridge) {
-+ if (skb->nf_bridge->physindev)
-+ dev_put(skb->nf_bridge->physindev);
-+ if (skb->nf_bridge->physoutdev)
-+ dev_put(skb->nf_bridge->physoutdev);
-+ }
-+#endif
- for (i = nf_hooks[info->pf][info->hook].next; i != elem; i = i->next) {
- if (i == &nf_hooks[info->pf][info->hook]) {
- /* The module which sent it to userspace is gone. */
-@@ -532,7 +563,7 @@
- verdict = nf_iterate(&nf_hooks[info->pf][info->hook],
- &skb, info->hook,
- info->indev, info->outdev, &elem,
-- info->okfn);
-+ info->okfn, INT_MIN);
- }
-
- switch (verdict) {
-diff -Nurb linux.stock/net/core/skbuff.c linux/net/core/skbuff.c
---- linux.stock/net/core/skbuff.c 2003-10-14 04:09:32.000000000 -0400
-+++ linux/net/core/skbuff.c 2004-07-10 23:46:39.000000000 -0400
-@@ -244,6 +244,9 @@
- #ifdef CONFIG_NETFILTER_DEBUG
- skb->nf_debug = 0;
- #endif
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ skb->nf_bridge = NULL;
-+#endif
- #endif
- #ifdef CONFIG_NET_SCHED
- skb->tc_index = 0;
-@@ -324,6 +327,9 @@
- }
- #ifdef CONFIG_NETFILTER
- nf_conntrack_put(skb->nfct);
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ nf_bridge_put(skb->nf_bridge);
-+#endif
- #endif
- skb_headerinit(skb, NULL, 0); /* clean state */
- kfree_skbmem(skb);
-@@ -390,6 +396,9 @@
- #ifdef CONFIG_NETFILTER_DEBUG
- C(nf_debug);
- #endif
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ C(nf_bridge);
-+#endif
- #endif /*CONFIG_NETFILTER*/
- #if defined(CONFIG_HIPPI)
- C(private);
-@@ -402,6 +411,9 @@
- skb->cloned = 1;
- #ifdef CONFIG_NETFILTER
- nf_conntrack_get(skb->nfct);
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ nf_bridge_get(skb->nf_bridge);
-+#endif
- #endif
- return n;
- }
-@@ -436,6 +448,10 @@
- #ifdef CONFIG_NETFILTER_DEBUG
- new->nf_debug=old->nf_debug;
- #endif
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ new->nf_bridge=old->nf_bridge;
-+ nf_bridge_get(new->nf_bridge);
-+#endif
- #endif
- #ifdef CONFIG_NET_SCHED
- new->tc_index = old->tc_index;
-@@ -722,8 +738,8 @@
- /* Set the tail pointer and length */
- skb_put(n,skb->len);
-
-- /* Copy the data only. */
-- if (skb_copy_bits(skb, 0, n->data, skb->len))
-+ /* Copy the linear data and header. */
-+ if (skb_copy_bits(skb, -newheadroom, n->head, newheadroom + skb->len))
- BUG();
-
- copy_skb_header(n, skb);
-diff -Nurb linux.stock/net/ipv4/ip_output.c linux/net/ipv4/ip_output.c
---- linux.stock/net/ipv4/ip_output.c 2003-10-14 04:09:33.000000000 -0400
-+++ linux/net/ipv4/ip_output.c 2004-07-10 23:46:39.000000000 -0400
-@@ -879,6 +879,10 @@
- /* Connection association is same as pre-frag packet */
- skb2->nfct = skb->nfct;
- nf_conntrack_get(skb2->nfct);
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ skb2->nf_bridge = skb->nf_bridge;
-+ nf_bridge_get(skb2->nf_bridge);
-+#endif
- #ifdef CONFIG_NETFILTER_DEBUG
- skb2->nf_debug = skb->nf_debug;
- #endif
-diff -Nurb linux.stock/net/ipv4/netfilter/Config.in linux/net/ipv4/netfilter/Config.in
---- linux.stock/net/ipv4/netfilter/Config.in 2004-07-10 23:30:19.000000000 -0400
-+++ linux/net/ipv4/netfilter/Config.in 2004-07-10 23:46:39.000000000 -0400
-@@ -83,6 +83,9 @@
- dep_tristate ' String match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_STRING $CONFIG_IP_NF_IPTABLES
- dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
- fi
-+ if [ "$CONFIG_BRIDGE" != "n" ]; then
-+ dep_tristate ' Physdev match support' CONFIG_IP_NF_MATCH_PHYSDEV $CONFIG_IP_NF_IPTABLES
-+ fi
- # The targets
- dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES
- if [ "$CONFIG_IP_NF_FILTER" != "n" ]; then
-diff -Nurb linux.stock/net/ipv4/netfilter/Makefile linux/net/ipv4/netfilter/Makefile
---- linux.stock/net/ipv4/netfilter/Makefile 2004-07-10 23:30:19.000000000 -0400
-+++ linux/net/ipv4/netfilter/Makefile 2004-07-10 23:46:39.000000000 -0400
-@@ -149,6 +149,8 @@
- obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
- obj-$(CONFIG_IP_NF_MATCH_REALM) += ipt_realm.o
-
-+obj-$(CONFIG_IP_NF_MATCH_PHYSDEV) += ipt_physdev.o
++ if (skb->protocol != __constant_htons(ETH_P_IP))
++ return NF_ACCEPT;
++
++ /* Sometimes we get packets with NULL ->dst here (for example,
++ * running a dhcp client daemon triggers this).
++ */
++ if (skb->dst == NULL)
++ return NF_ACCEPT;
+
- # targets
- obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
- obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
-diff -Nurb linux.stock/net/ipv4/netfilter/ip_tables.c linux/net/ipv4/netfilter/ip_tables.c
---- linux.stock/net/ipv4/netfilter/ip_tables.c 2004-07-10 23:29:53.000000000 -0400
-+++ linux/net/ipv4/netfilter/ip_tables.c 2004-07-10 23:46:39.000000000 -0400
-@@ -121,12 +121,19 @@
- static inline int
- ip_packet_match(const struct iphdr *ip,
- const char *indev,
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ const char *physindev,
-+#endif
- const char *outdev,
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ const char *physoutdev,
++#ifdef CONFIG_NETFILTER_DEBUG
++ skb->nf_debug ^= (1 << NF_IP_POST_ROUTING);
+#endif
- const struct ipt_ip *ipinfo,
- int isfrag)
- {
- size_t i;
- unsigned long ret;
-+ unsigned long ret2 = 1;
-
- #define FWINV(bool,invflg) ((bool) ^ !!(ipinfo->invflags & invflg))
-
-@@ -156,7 +163,15 @@
- & ((const unsigned long *)ipinfo->iniface_mask)[i];
- }
-
-- if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
-+ ret2 |= (((const unsigned long *)physindev)[i]
-+ ^ ((const unsigned long *)ipinfo->iniface)[i])
-+ & ((const unsigned long *)ipinfo->iniface_mask)[i];
++
++ /* We assume any code from br_dev_queue_push_xmit onwards doesn't care
++ * about the value of skb->pkt_type.
++ */
++ if (skb->pkt_type == PACKET_OTHERHOST) {
++ skb->pkt_type = PACKET_HOST;
++ nf_bridge->mask |= BRNF_PKT_TYPE;
+ }
-+#endif
+
-+ if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_IN)) {
- dprintf("VIA in mismatch (%s vs %s).%s\n",
- indev, ipinfo->iniface,
- ipinfo->invflags&IPT_INV_VIA_IN ?" (INV)":"");
-@@ -169,7 +184,15 @@
- & ((const unsigned long *)ipinfo->outiface_mask)[i];
- }
-
-- if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ for (i = 0, ret2 = 0; i < IFNAMSIZ/sizeof(unsigned long); i++) {
-+ ret2 |= (((const unsigned long *)physoutdev)[i]
-+ ^ ((const unsigned long *)ipinfo->outiface)[i])
-+ & ((const unsigned long *)ipinfo->outiface_mask)[i];
++ memcpy(nf_bridge->hh, skb->data - 16, 16);
++
++ NF_HOOK(PF_INET, NF_IP_POST_ROUTING, skb, NULL,
++ bridge_parent(skb->dev), br_dev_queue_push_xmit);
++
++ return NF_STOLEN;
++}
++
++
++/* IPv4/SABOTAGE *****************************************************/
++
++/* Don't hand locally destined packets to PF_INET/PRE_ROUTING
++ * for the second time.
++ */
++static unsigned int ipv4_sabotage_in(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*okfn)(struct sk_buff *))
++{
++ if (in->hard_start_xmit == br_dev_xmit &&
++ okfn != br_nf_pre_routing_finish) {
++ okfn(*pskb);
++ return NF_STOLEN;
+ }
-+#endif
+
-+ if (FWINV(ret != 0 && ret2 != 0, IPT_INV_VIA_OUT)) {
- dprintf("VIA out mismatch (%s vs %s).%s\n",
- outdev, ipinfo->outiface,
- ipinfo->invflags&IPT_INV_VIA_OUT ?" (INV)":"");
-@@ -272,6 +295,9 @@
- /* Initializing verdict to NF_DROP keeps gcc happy. */
- unsigned int verdict = NF_DROP;
- const char *indev, *outdev;
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ const char *physindev, *physoutdev;
-+#endif
- void *table_base;
- struct ipt_entry *e, *back;
-
-@@ -281,6 +307,13 @@
- datalen = (*pskb)->len - ip->ihl * 4;
- indev = in ? in->name : nulldevname;
- outdev = out ? out->name : nulldevname;
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ physindev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physindev) ?
-+ (*pskb)->nf_bridge->physindev->name : nulldevname;
-+ physoutdev = ((*pskb)->nf_bridge && (*pskb)->nf_bridge->physoutdev) ?
-+ (*pskb)->nf_bridge->physoutdev->name : nulldevname;
-+#endif
++ return NF_ACCEPT;
++}
+
- /* We handle fragments by dealing with the first fragment as
- * if it was a normal packet. All other fragments are treated
- * normally, except that they will NEVER match rules that ask
-@@ -316,7 +349,15 @@
- IP_NF_ASSERT(e);
- IP_NF_ASSERT(back);
- (*pskb)->nfcache |= e->nfcache;
-- if (ip_packet_match(ip, indev, outdev, &e->ip, offset)) {
-+ if (ip_packet_match(ip, indev,
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ physindev,
-+#endif
-+ outdev,
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ physoutdev,
-+#endif
-+ &e->ip, offset)) {
- struct ipt_entry_target *t;
-
- if (IPT_MATCH_ITERATE(e, do_match,
-diff -Nurb linux.stock/net/ipv4/netfilter/ipt_LOG.c linux/net/ipv4/netfilter/ipt_LOG.c
---- linux.stock/net/ipv4/netfilter/ipt_LOG.c 2004-07-10 23:29:56.000000000 -0400
-+++ linux/net/ipv4/netfilter/ipt_LOG.c 2004-07-10 23:46:39.000000000 -0400
-@@ -319,6 +319,18 @@
- prefix == NULL ? loginfo->prefix : prefix,
- in ? in->name : "",
- out ? out->name : "");
-+#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
-+ if ((*pskb)->nf_bridge) {
-+ struct net_device *physindev = (*pskb)->nf_bridge->physindev;
-+ struct net_device *physoutdev = (*pskb)->nf_bridge->physoutdev;
++/* Postpone execution of PF_INET/FORWARD, PF_INET/LOCAL_OUT
++ * and PF_INET/POST_ROUTING until we have done the forwarding
++ * decision in the bridge code and have determined skb->physoutdev.
++ */
++static unsigned int ipv4_sabotage_out(unsigned int hook, struct sk_buff **pskb,
++ const struct net_device *in, const struct net_device *out,
++ int (*okfn)(struct sk_buff *))
++{
++ if (out->hard_start_xmit == br_dev_xmit &&
++ okfn != br_nf_forward_finish &&
++ okfn != br_nf_local_out_finish &&
++ okfn != br_dev_queue_push_xmit) {
++ struct sk_buff *skb = *pskb;
++ struct nf_bridge_info *nf_bridge;
+
-+ if (physindev && in != physindev)
-+ printk("PHYSIN=%s ", physindev->name);
-+ if (physoutdev && out != physoutdev)
-+ printk("PHYSOUT=%s ", physoutdev->name);
++ if (!skb->nf_bridge && !nf_bridge_alloc(skb))
++ return NF_DROP;
++
++ nf_bridge = skb->nf_bridge;
++
++ /* This frame will arrive on PF_BRIDGE/LOCAL_OUT and we
++ * will need the indev then. For a brouter, the real indev
++ * can be a bridge port, so we make sure br_nf_local_out()
++ * doesn't use the bridge parent of the indev by using
++ * the BRNF_DONT_TAKE_PARENT mask.
++ */
++ if (hook == NF_IP_FORWARD && nf_bridge->physindev == NULL) {
++ nf_bridge->mask &= BRNF_DONT_TAKE_PARENT;
++ nf_bridge->physindev = (struct net_device *)in;
++ }
++ okfn(skb);
++ return NF_STOLEN;
+ }
-+#endif
+
- if (in && !out) {
- /* MAC logging for input chain only. */
- printk("MAC=");
-diff -Nurb linux.stock/net/ipv4/netfilter/ipt_physdev.c linux/net/ipv4/netfilter/ipt_physdev.c
---- linux.stock/net/ipv4/netfilter/ipt_physdev.c 1969-12-31 19:00:00.000000000 -0500
-+++ linux/net/ipv4/netfilter/ipt_physdev.c 2004-07-10 23:46:39.000000000 -0400
++ return NF_ACCEPT;
++}
++
++/* For br_nf_local_out we need (prio = NF_BR_PRI_FIRST), to insure that innocent
++ * PF_BRIDGE/NF_BR_LOCAL_OUT functions don't get bridged traffic as input.
++ * For br_nf_post_routing, we need (prio = NF_BR_PRI_LAST), because
++ * ip_refrag() can return NF_STOLEN.
++ */
++static struct nf_hook_ops br_nf_ops[] = {
++ { .hook = br_nf_pre_routing,
++ .pf = PF_BRIDGE,
++ .hooknum = NF_BR_PRE_ROUTING,
++ .priority = NF_BR_PRI_BRNF, },
++ { .hook = br_nf_local_in,
++ .pf = PF_BRIDGE,
++ .hooknum = NF_BR_LOCAL_IN,
++ .priority = NF_BR_PRI_BRNF, },
++ { .hook = br_nf_forward,
++ .pf = PF_BRIDGE,
++ .hooknum = NF_BR_FORWARD,
++ .priority = NF_BR_PRI_BRNF, },
++ { .hook = br_nf_local_out,
++ .pf = PF_BRIDGE,
++ .hooknum = NF_BR_LOCAL_OUT,
++ .priority = NF_BR_PRI_FIRST, },
++ { .hook = br_nf_post_routing,
++ .pf = PF_BRIDGE,
++ .hooknum = NF_BR_POST_ROUTING,
++ .priority = NF_BR_PRI_LAST, },
++ { .hook = ipv4_sabotage_in,
++ .pf = PF_INET,
++ .hooknum = NF_IP_PRE_ROUTING,
++ .priority = NF_IP_PRI_FIRST, },
++ { .hook = ipv4_sabotage_out,
++ .pf = PF_INET,
++ .hooknum = NF_IP_FORWARD,
++ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_FORWARD, },
++ { .hook = ipv4_sabotage_out,
++ .pf = PF_INET,
++ .hooknum = NF_IP_LOCAL_OUT,
++ .priority = NF_IP_PRI_BRIDGE_SABOTAGE_LOCAL_OUT, },
++ { .hook = ipv4_sabotage_out,
++ .pf = PF_INET,
++ .hooknum = NF_IP_POST_ROUTING,
++ .priority = NF_IP_PRI_FIRST, },
++};
++
++int br_netfilter_init(void)
++{
++ int i;
++
++ for (i = 0; i < ARRAY_SIZE(br_nf_ops); i++) {
++ int ret;
++
++ if ((ret = nf_register_hook(&br_nf_ops[i])) >= 0)
++ continue;
++
++ while (i--)
++ nf_unregister_hook(&br_nf_ops[i]);
++
++ return ret;
++ }
++
++ printk(KERN_NOTICE "Bridge firewalling registered\n");
++
++ return 0;
++}
++
++void br_netfilter_fini(void)
++{
++ int i;
++
++ for (i = ARRAY_SIZE(br_nf_ops) - 1; i >= 0; i--)
++ nf_unregister_hook(&br_nf_ops[i]);
++}
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/net/ipv4/netfilter/ipt_physdev.c Fri Aug 8 01:09:06 2003
@@ -0,0 +1,127 @@
+/* Kernel module to match the bridge port in and
+ * out device for IP packets coming into contact with a bridge. */
+module_exit(fini);
+MODULE_LICENSE("GPL");
+EXPORT_NO_SYMBOLS;
+--- /dev/null Thu Aug 24 11:00:32 2000
++++ linux-2.4.21-ebt-brnf-3/include/linux/netfilter_ipv4/ipt_physdev.h Fri Aug 8 01:09:06 2003
+@@ -0,0 +1,24 @@
++#ifndef _IPT_PHYSDEV_H
++#define _IPT_PHYSDEV_H
++
++#ifdef __KERNEL__
++#include <linux/if.h>
++#endif
++
++#define IPT_PHYSDEV_OP_IN 0x01
++#define IPT_PHYSDEV_OP_OUT 0x02
++#define IPT_PHYSDEV_OP_BRIDGED 0x04
++#define IPT_PHYSDEV_OP_ISIN 0x08
++#define IPT_PHYSDEV_OP_ISOUT 0x10
++#define IPT_PHYSDEV_OP_MASK (0x20 - 1)
++
++struct ipt_physdev_info {
++ u_int8_t invert;
++ u_int8_t bitmask;
++ char physindev[IFNAMSIZ];
++ char in_mask[IFNAMSIZ];
++ char physoutdev[IFNAMSIZ];
++ char out_mask[IFNAMSIZ];
++};
++
++#endif /*_IPT_PHYSDEV_H*/
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