+++ /dev/null
---- /dev/null
-+++ b/net/ipv6/netfilter/ip6t_REJECT.c
-@@ -0,0 +1,301 @@
-+/*
-+ * This is a module which is used for rejecting packets.
-+ * Added support for customized reject packets (Jozsef Kadlecsik).
-+ * Sun 12 Nov 2000
-+ * Port to IPv6 / ip6tables (Harald Welte <laforge@gnumonks.org>)
-+ */
-+#include <linux/config.h>
-+#include <linux/module.h>
-+#include <linux/skbuff.h>
-+#include <linux/icmpv6.h>
-+#include <net/tcp.h>
-+#include <net/ipv6.h>
-+#include <net/ip6_fib.h>
-+#include <net/ip6_route.h>
-+#include <linux/netfilter_ipv6/ip6_tables.h>
-+#include <linux/netfilter_ipv6/ip6t_REJECT.h>
-+
-+#if 1
-+#define DEBUGP printk
-+#else
-+#define DEBUGP(format, args...)
-+#endif
-+
-+#if 0
-+/* Send RST reply */
-+static void send_reset(struct sk_buff *oldskb)
-+{
-+ struct sk_buff *nskb;
-+ struct tcphdr *otcph, *tcph;
-+ struct rtable *rt;
-+ unsigned int otcplen;
-+ int needs_ack;
-+
-+ /* IP header checks: fragment, too short. */
-+ if (oldskb->nh.iph->frag_off & htons(IP_OFFSET)
-+ || oldskb->len < (oldskb->nh.iph->ihl<<2) + sizeof(struct tcphdr))
-+ return;
-+
-+ otcph = (struct tcphdr *)((u_int32_t*)oldskb->nh.iph + oldskb->nh.iph->ihl);
-+ otcplen = oldskb->len - oldskb->nh.iph->ihl*4;
-+
-+ /* No RST for RST. */
-+ if (otcph->rst)
-+ return;
-+
-+ /* Check checksum. */
-+ if (tcp_v4_check(otcph, otcplen, oldskb->nh.iph->saddr,
-+ oldskb->nh.iph->daddr,
-+ csum_partial((char *)otcph, otcplen, 0)) != 0)
-+ return;
-+
-+ /* Copy skb (even if skb is about to be dropped, we can't just
-+ clone it because there may be other things, such as tcpdump,
-+ interested in it) */
-+ nskb = skb_copy(oldskb, GFP_ATOMIC);
-+ if (!nskb)
-+ return;
-+
-+ /* This packet will not be the same as the other: clear nf fields */
-+ nf_conntrack_put(nskb->nfct);
-+ nskb->nfct = NULL;
-+ nskb->nfcache = 0;
-+#ifdef CONFIG_NETFILTER_DEBUG
-+ nskb->nf_debug = 0;
-+#endif
-+
-+ tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl);
-+
-+ nskb->nh.iph->daddr = xchg(&nskb->nh.iph->saddr, nskb->nh.iph->daddr);
-+ tcph->source = xchg(&tcph->dest, tcph->source);
-+
-+ /* Truncate to length (no data) */
-+ tcph->doff = sizeof(struct tcphdr)/4;
-+ skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr));
-+ nskb->nh.iph->tot_len = htons(nskb->len);
-+
-+ if (tcph->ack) {
-+ needs_ack = 0;
-+ tcph->seq = otcph->ack_seq;
-+ tcph->ack_seq = 0;
-+ } else {
-+ needs_ack = 1;
-+ tcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn + otcph->fin
-+ + otcplen - (otcph->doff<<2));
-+ tcph->seq = 0;
-+ }
-+
-+ /* Reset flags */
-+ ((u_int8_t *)tcph)[13] = 0;
-+ tcph->rst = 1;
-+ tcph->ack = needs_ack;
-+
-+ tcph->window = 0;
-+ tcph->urg_ptr = 0;
-+
-+ /* Adjust TCP checksum */
-+ tcph->check = 0;
-+ tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr),
-+ nskb->nh.iph->saddr,
-+ nskb->nh.iph->daddr,
-+ csum_partial((char *)tcph,
-+ sizeof(struct tcphdr), 0));
-+
-+ /* Adjust IP TTL, DF */
-+ nskb->nh.iph->ttl = MAXTTL;
-+ /* Set DF, id = 0 */
-+ nskb->nh.iph->frag_off = htons(IP_DF);
-+ nskb->nh.iph->id = 0;
-+
-+ /* Adjust IP checksum */
-+ nskb->nh.iph->check = 0;
-+ nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph,
-+ nskb->nh.iph->ihl);
-+
-+ /* Routing */
-+ if (ip_route_output(&rt, nskb->nh.iph->daddr, nskb->nh.iph->saddr,
-+ RT_TOS(nskb->nh.iph->tos) | RTO_CONN,
-+ 0) != 0)
-+ goto free_nskb;
-+
-+ dst_release(nskb->dst);
-+ nskb->dst = &rt->u.dst;
-+
-+ /* "Never happens" */
-+ if (nskb->len > nskb->dst->pmtu)
-+ goto free_nskb;
-+
-+ NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
-+ ip_finish_output);
-+ return;
-+
-+ free_nskb:
-+ kfree_skb(nskb);
-+}
-+#endif
-+
-+static unsigned int reject6_target(struct sk_buff **pskb,
-+ unsigned int hooknum,
-+ const struct net_device *in,
-+ const struct net_device *out,
-+ const void *targinfo,
-+ void *userinfo)
-+{
-+ const struct ip6t_reject_info *reject = targinfo;
-+ struct sk_buff *skb2 = NULL;
-+ struct rt6_info *rt6i;
-+ struct net_device odev;
-+
-+ if (!out) {
-+ skb2 = skb_clone(*pskb, GFP_ATOMIC);
-+ if (skb2 == NULL) {
-+ return NF_DROP;
-+ }
-+ dst_release(skb2->dst);
-+ skb2->dst = NULL;
-+
-+ rt6i = rt6_lookup(&skb2->nh.ipv6h->saddr, NULL, 0, 0);
-+ if (rt6i && rt6i->rt6i_dev) {
-+ skb2->dev = rt6i->rt6i_dev;
-+ rt6i = rt6_lookup(&skb2->nh.ipv6h->daddr, &skb2->nh.ipv6h->saddr, 0, 0);
-+ }
-+ memcpy(&odev, skb2->dev, sizeof(odev)); /* XXX 'out' has 'const' qualifier... */
-+ } else {
-+ memcpy(&odev, out, sizeof(odev));
-+ }
-+
-+ printk(KERN_DEBUG "%s: medium point\n", __FUNCTION__);
-+ /* WARNING: This code causes reentry within ip6tables.
-+ This means that the ip6tables jump stack is now crap. We
-+ must return an absolute verdict. --RR */
-+ DEBUGP("REJECTv6: calling icmpv6_send\n");
-+ switch (reject->with) {
-+ case IP6T_ICMP6_NO_ROUTE:
-+ icmpv6_send(*pskb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, &odev);
-+ break;
-+ case IP6T_ICMP6_ADM_PROHIBITED:
-+ icmpv6_send(*pskb, ICMPV6_DEST_UNREACH, ICMPV6_ADM_PROHIBITED, 0, &odev);
-+ break;
-+ case IP6T_ICMP6_NOT_NEIGHBOUR:
-+ icmpv6_send(*pskb, ICMPV6_DEST_UNREACH, ICMPV6_NOT_NEIGHBOUR, 0, &odev);
-+ break;
-+ case IP6T_ICMP6_ADDR_UNREACH:
-+ icmpv6_send(*pskb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, &odev);
-+ break;
-+ case IP6T_ICMP6_PORT_UNREACH:
-+ icmpv6_send(*pskb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, &odev);
-+ break;
-+#if 0
-+ case IPT_ICMP_ECHOREPLY: {
-+ struct icmp6hdr *icmph = (struct icmphdr *)
-+ ((u_int32_t *)(*pskb)->nh.iph + (*pskb)->nh.iph->ihl);
-+ unsigned int datalen = (*pskb)->len - (*pskb)->nh.iph->ihl * 4;
-+
-+ /* Not non-head frags, or truncated */
-+ if (((ntohs((*pskb)->nh.iph->frag_off) & IP_OFFSET) == 0)
-+ && datalen >= 4) {
-+ /* Usually I don't like cut & pasting code,
-+ but dammit, my party is starting in 45
-+ mins! --RR */
-+ struct icmp_bxm icmp_param;
-+
-+ icmp_param.icmph=*icmph;
-+ icmp_param.icmph.type=ICMP_ECHOREPLY;
-+ icmp_param.data_ptr=(icmph+1);
-+ icmp_param.data_len=datalen;
-+ icmp_reply(&icmp_param, *pskb);
-+ }
-+ }
-+ break;
-+ case IPT_TCP_RESET:
-+ send_reset(*pskb);
-+ break;
-+#endif
-+ default:
-+ printk(KERN_WARNING "REJECTv6: case %u not handled yet\n", reject->with);
-+ break;
-+ }
-+
-+ if (skb2) kfree_skb(skb2);
-+
-+ return NF_DROP;
-+}
-+
-+static inline int find_ping_match(const struct ip6t_entry_match *m)
-+{
-+ const struct ip6t_icmp *icmpinfo = (const struct ip6t_icmp *)m->data;
-+
-+ if (strcmp(m->u.kernel.match->name, "icmp6") == 0
-+ && icmpinfo->type == ICMPV6_ECHO_REQUEST
-+ && !(icmpinfo->invflags & IP6T_ICMP_INV))
-+ return 1;
-+
-+ return 0;
-+}
-+
-+static int check(const char *tablename,
-+ const struct ip6t_entry *e,
-+ void *targinfo,
-+ unsigned int targinfosize,
-+ unsigned int hook_mask)
-+{
-+ const struct ip6t_reject_info *rejinfo = targinfo;
-+
-+ if (targinfosize != IP6T_ALIGN(sizeof(struct ip6t_reject_info))) {
-+ DEBUGP("REJECTv6: targinfosize %u != 0\n", targinfosize);
-+ return 0;
-+ }
-+
-+ /* Only allow these for packet filtering. */
-+ if (strcmp(tablename, "filter") != 0) {
-+ DEBUGP("REJECTv6: bad table `%s'.\n", tablename);
-+ return 0;
-+ }
-+ if ((hook_mask & ~((1 << NF_IP6_LOCAL_IN)
-+ | (1 << NF_IP6_FORWARD)
-+ | (1 << NF_IP6_LOCAL_OUT))) != 0) {
-+ DEBUGP("REJECTv6: bad hook mask %X\n", hook_mask);
-+ return 0;
-+ }
-+
-+ if (rejinfo->with == IP6T_ICMP6_ECHOREPLY) {
-+ /* Must specify that it's an ICMP ping packet. */
-+ if (e->ipv6.proto != IPPROTO_ICMPV6
-+ || (e->ipv6.invflags & IP6T_INV_PROTO)) {
-+ DEBUGP("REJECTv6: ECHOREPLY illegal for non-icmp\n");
-+ return 0;
-+ }
-+ /* Must contain ICMP match. */
-+ if (IP6T_MATCH_ITERATE(e, find_ping_match) == 0) {
-+ DEBUGP("REJECTv6: ECHOREPLY illegal for non-ping\n");
-+ return 0;
-+ }
-+ } else if (rejinfo->with == IP6T_TCP_RESET) {
-+ /* Must specify that it's a TCP packet */
-+ if (e->ipv6.proto != IPPROTO_TCP
-+ || (e->ipv6.invflags & IP6T_INV_PROTO)) {
-+ DEBUGP("REJECTv6: TCP_RESET illegal for non-tcp\n");
-+ return 0;
-+ }
-+ }
-+
-+ return 1;
-+}
-+
-+static struct ip6t_target ip6t_reject_reg
-+= { { NULL, NULL }, "REJECT", reject6_target, check, NULL, THIS_MODULE };
-+
-+static int __init init(void)
-+{
-+ if (ip6t_register_target(&ip6t_reject_reg))
-+ return -EINVAL;
-+ return 0;
-+}
-+
-+static void __exit fini(void)
-+{
-+ ip6t_unregister_target(&ip6t_reject_reg);
-+}
-+
-+module_init(init);
-+module_exit(fini);
---- a/include/linux/netfilter_ipv6/ip6t_REJECT.h
-+++ b/include/linux/netfilter_ipv6/ip6t_REJECT.h
-@@ -2,15 +2,17 @@
- #define _IP6T_REJECT_H
-
- enum ip6t_reject_with {
-- IP6T_ICMP_NET_UNREACHABLE,
-- IP6T_ICMP_HOST_UNREACHABLE,
-- IP6T_ICMP_PROT_UNREACHABLE,
-- IP6T_ICMP_PORT_UNREACHABLE,
-- IP6T_ICMP_ECHOREPLY
-+ IP6T_ICMP6_NO_ROUTE,
-+ IP6T_ICMP6_ADM_PROHIBITED,
-+ IP6T_ICMP6_NOT_NEIGHBOUR,
-+ IP6T_ICMP6_ADDR_UNREACH,
-+ IP6T_ICMP6_PORT_UNREACH,
-+ IP6T_ICMP6_ECHOREPLY,
-+ IP6T_TCP_RESET
- };
-
- struct ip6t_reject_info {
- enum ip6t_reject_with with; /* reject type */
- };
-
--#endif /*_IPT_REJECT_H*/
-+#endif /*_IP6T_REJECT_H*/
---- a/net/ipv6/netfilter/Makefile
-+++ b/net/ipv6/netfilter/Makefile
-@@ -34,5 +34,7 @@ obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.
- obj-$(CONFIG_IP6_NF_TARGET_LOG) += ip6t_LOG.o
- obj-$(CONFIG_IP6_NF_MATCH_RANDOM) += ip6t_random.o
- obj-$(CONFIG_IP6_NF_MATCH_HL) += ip6t_hl.o
-+obj-$(CONFIG_IP6_NF_TARGET_REJECT) += ip6t_REJECT.o
-+
-
- include $(TOPDIR)/Rules.make
---- a/net/ipv6/netfilter/Config.in
-+++ b/net/ipv6/netfilter/Config.in
-@@ -61,6 +61,9 @@ if [ "$CONFIG_IP6_NF_IPTABLES" != "n" ];
- if [ "$CONFIG_IP6_NF_FILTER" != "n" ]; then
- dep_tristate ' LOG target support' CONFIG_IP6_NF_TARGET_LOG $CONFIG_IP6_NF_FILTER
- fi
-+ if [ "$CONFIG_IP6_NF_FILTER" != "n" ]; then
-+ dep_tristate ' REJECT target support' CONFIG_IP6_NF_TARGET_REJECT $CONFIG_IP6_NF_FILTER
-+ fi
-
- # if [ "$CONFIG_IP6_NF_FILTER" != "n" ]; then
- # dep_tristate ' REJECT target support' CONFIG_IP6_NF_TARGET_REJECT $CONFIG_IP6_NF_FILTER
projects / openwrt / svn-archive / archive.git / blobdiff