+++ /dev/null
-From ffe387740bbe88dd88bbe04d6375902708003d6e Mon Sep 17 00:00:00 2001
-From: Felix Fietkau <nbd@nbd.name>
-Date: Fri, 7 Jul 2017 17:25:00 +0200
-Subject: net: add packet mangeling patch
-
-Signed-off-by: Felix Fietkau <nbd@nbd.name>
----
- include/linux/netdevice.h | 11 +++++++++++
- include/linux/skbuff.h | 14 ++++----------
- net/Kconfig | 6 ++++++
- net/core/dev.c | 18 ++++++++++++++----
- net/core/skbuff.c | 17 +++++++++++++++++
- net/ethernet/eth.c | 6 ++++++
- 6 files changed, 58 insertions(+), 14 deletions(-)
-
---- a/include/linux/netdevice.h
-+++ b/include/linux/netdevice.h
-@@ -1400,6 +1400,7 @@ enum netdev_priv_flags {
- IFF_PHONY_HEADROOM = 1<<26,
- IFF_MACSEC = 1<<27,
- IFF_L3MDEV_RX_HANDLER = 1<<28,
-+ IFF_NO_IP_ALIGN = 1<<29,
- };
-
- #define IFF_802_1Q_VLAN IFF_802_1Q_VLAN
-@@ -1430,6 +1431,7 @@ enum netdev_priv_flags {
- #define IFF_RXFH_CONFIGURED IFF_RXFH_CONFIGURED
- #define IFF_MACSEC IFF_MACSEC
- #define IFF_L3MDEV_RX_HANDLER IFF_L3MDEV_RX_HANDLER
-+#define IFF_NO_IP_ALIGN IFF_NO_IP_ALIGN
-
- /**
- * struct net_device - The DEVICE structure.
-@@ -1716,6 +1718,11 @@ struct net_device {
- const struct ndisc_ops *ndisc_ops;
- #endif
-
-+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
-+ void (*eth_mangle_rx)(struct net_device *dev, struct sk_buff *skb);
-+ struct sk_buff *(*eth_mangle_tx)(struct net_device *dev, struct sk_buff *skb);
-+#endif
-+
- const struct header_ops *header_ops;
-
- unsigned int flags;
-@@ -1788,6 +1795,10 @@ struct net_device {
- struct mpls_dev __rcu *mpls_ptr;
- #endif
-
-+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
-+ void *phy_ptr; /* PHY device specific data */
-+#endif
-+
- /*
- * Cache lines mostly used on receive path (including eth_type_trans())
- */
---- a/include/linux/skbuff.h
-+++ b/include/linux/skbuff.h
-@@ -2340,6 +2340,10 @@ static inline int pskb_trim(struct sk_bu
- return (len < skb->len) ? __pskb_trim(skb, len) : 0;
- }
-
-+extern struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
-+ unsigned int length, gfp_t gfp);
-+
-+
- /**
- * pskb_trim_unique - remove end from a paged unique (not cloned) buffer
- * @skb: buffer to alter
-@@ -2460,16 +2464,6 @@ static inline struct sk_buff *dev_alloc_
- }
-
-
--static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
-- unsigned int length, gfp_t gfp)
--{
-- struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
--
-- if (NET_IP_ALIGN && skb)
-- skb_reserve(skb, NET_IP_ALIGN);
-- return skb;
--}
--
- static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
- unsigned int length)
- {
---- a/net/Kconfig
-+++ b/net/Kconfig
-@@ -25,6 +25,12 @@ menuconfig NET
-
- if NET
-
-+config ETHERNET_PACKET_MANGLE
-+ bool
-+ help
-+ This option can be selected by phy drivers that need to mangle
-+ packets going in or out of an ethernet device.
-+
- config WANT_COMPAT_NETLINK_MESSAGES
- bool
- help
---- a/net/core/dev.c
-+++ b/net/core/dev.c
-@@ -2972,10 +2972,20 @@ static int xmit_one(struct sk_buff *skb,
- if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
- dev_queue_xmit_nit(skb, dev);
-
-- len = skb->len;
-- trace_net_dev_start_xmit(skb, dev);
-- rc = netdev_start_xmit(skb, dev, txq, more);
-- trace_net_dev_xmit(skb, rc, dev, len);
-+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
-+ if (!dev->eth_mangle_tx ||
-+ (skb = dev->eth_mangle_tx(dev, skb)) != NULL)
-+#else
-+ if (1)
-+#endif
-+ {
-+ len = skb->len;
-+ trace_net_dev_start_xmit(skb, dev);
-+ rc = netdev_start_xmit(skb, dev, txq, more);
-+ trace_net_dev_xmit(skb, rc, dev, len);
-+ } else {
-+ rc = NETDEV_TX_OK;
-+ }
-
- return rc;
- }
---- a/net/core/skbuff.c
-+++ b/net/core/skbuff.c
-@@ -64,6 +64,7 @@
- #include <linux/errqueue.h>
- #include <linux/prefetch.h>
- #include <linux/if_vlan.h>
-+#include <linux/if.h>
-
- #include <net/protocol.h>
- #include <net/dst.h>
-@@ -533,6 +534,22 @@ skb_fail:
- }
- EXPORT_SYMBOL(__napi_alloc_skb);
-
-+struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
-+ unsigned int length, gfp_t gfp)
-+{
-+ struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
-+
-+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
-+ if (dev && (dev->priv_flags & IFF_NO_IP_ALIGN))
-+ return skb;
-+#endif
-+
-+ if (NET_IP_ALIGN && skb)
-+ skb_reserve(skb, NET_IP_ALIGN);
-+ return skb;
-+}
-+EXPORT_SYMBOL(__netdev_alloc_skb_ip_align);
-+
- void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
- int size, unsigned int truesize)
- {
---- a/net/ethernet/eth.c
-+++ b/net/ethernet/eth.c
-@@ -171,6 +171,12 @@ __be16 eth_type_trans(struct sk_buff *sk
- const struct ethhdr *eth;
-
- skb->dev = dev;
-+
-+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
-+ if (dev->eth_mangle_rx)
-+ dev->eth_mangle_rx(dev, skb);
-+#endif
-+
- skb_reset_mac_header(skb);
-
- eth = (struct ethhdr *)skb->data;
projects / openwrt / openwrt.git / blobdiff