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154 lines
4.2 KiB
154 lines
4.2 KiB
--- a/include/linux/netdevice.h
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+++ b/include/linux/netdevice.h
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@@ -1244,6 +1244,11 @@ struct net_device {
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const struct ethtool_ops *ethtool_ops;
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const struct forwarding_accel_ops *fwd_ops;
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ void (*eth_mangle_rx)(struct net_device *dev, struct sk_buff *skb);
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+ struct sk_buff *(*eth_mangle_tx)(struct net_device *dev, struct sk_buff *skb);
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+#endif
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+
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/* Hardware header description */
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const struct header_ops *header_ops;
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@@ -1312,6 +1317,9 @@ struct net_device {
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void *ax25_ptr; /* AX.25 specific data */
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struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
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assign before registering */
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ void *phy_ptr; /* PHY device specific data */
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+#endif
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/*
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* Cache lines mostly used on receive path (including eth_type_trans())
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--- a/include/uapi/linux/if.h
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+++ b/include/uapi/linux/if.h
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@@ -84,6 +84,7 @@
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#define IFF_LIVE_ADDR_CHANGE 0x100000 /* device supports hardware address
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* change when it's running */
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#define IFF_MACVLAN 0x200000 /* Macvlan device */
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+#define IFF_NO_IP_ALIGN 0x200000 /* do not ip-align allocated rx pkts */
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#define IF_GET_IFACE 0x0001 /* for querying only */
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--- a/include/linux/skbuff.h
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+++ b/include/linux/skbuff.h
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@@ -1858,6 +1858,10 @@ static inline int pskb_trim(struct sk_bu
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return (len < skb->len) ? __pskb_trim(skb, len) : 0;
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}
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+extern struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
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+ unsigned int length, gfp_t gfp);
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+
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+
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/**
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* pskb_trim_unique - remove end from a paged unique (not cloned) buffer
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* @skb: buffer to alter
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@@ -1984,16 +1988,6 @@ static inline struct sk_buff *dev_alloc_
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}
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-static inline struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
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- unsigned int length, gfp_t gfp)
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-{
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- struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
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-
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- if (NET_IP_ALIGN && skb)
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- skb_reserve(skb, NET_IP_ALIGN);
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- return skb;
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-}
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-
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static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
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unsigned int length)
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{
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--- a/net/Kconfig
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+++ b/net/Kconfig
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@@ -24,6 +24,12 @@ menuconfig NET
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if NET
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+config ETHERNET_PACKET_MANGLE
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+ bool
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+ help
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+ This option can be selected by phy drivers that need to mangle
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+ packets going in or out of an ethernet device.
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+
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config WANT_COMPAT_NETLINK_MESSAGES
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bool
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help
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -2607,10 +2607,20 @@ int dev_hard_start_xmit(struct sk_buff *
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if (!list_empty(&ptype_all))
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dev_queue_xmit_nit(skb, dev);
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- skb_len = skb->len;
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- trace_net_dev_start_xmit(skb, dev);
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- rc = ops->ndo_start_xmit(skb, dev);
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- trace_net_dev_xmit(skb, rc, dev, skb_len);
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ if (!dev->eth_mangle_tx ||
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+ (skb = dev->eth_mangle_tx(dev, skb)) != NULL)
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+#else
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+ if (1)
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+#endif
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+ {
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+ skb_len = skb->len;
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+ trace_net_dev_start_xmit(skb, dev);
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+ rc = ops->ndo_start_xmit(skb, dev);
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+ trace_net_dev_xmit(skb, rc, dev, skb_len);
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+ } else {
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+ rc = NETDEV_TX_OK;
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+ }
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if (rc == NETDEV_TX_OK)
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txq_trans_update(txq);
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return rc;
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--- a/net/core/skbuff.c
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+++ b/net/core/skbuff.c
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@@ -62,6 +62,7 @@
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#include <linux/scatterlist.h>
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#include <linux/errqueue.h>
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#include <linux/prefetch.h>
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+#include <linux/if.h>
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#include <net/protocol.h>
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#include <net/dst.h>
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@@ -439,6 +440,22 @@ struct sk_buff *__netdev_alloc_skb(struc
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}
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EXPORT_SYMBOL(__netdev_alloc_skb);
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+struct sk_buff *__netdev_alloc_skb_ip_align(struct net_device *dev,
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+ unsigned int length, gfp_t gfp)
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+{
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+ struct sk_buff *skb = __netdev_alloc_skb(dev, length + NET_IP_ALIGN, gfp);
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+
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ if (dev && (dev->priv_flags & IFF_NO_IP_ALIGN))
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+ return skb;
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+#endif
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+
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+ if (NET_IP_ALIGN && skb)
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+ skb_reserve(skb, NET_IP_ALIGN);
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+ return skb;
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+}
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+EXPORT_SYMBOL(__netdev_alloc_skb_ip_align);
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+
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void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off,
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int size, unsigned int truesize)
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{
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--- a/net/ethernet/eth.c
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+++ b/net/ethernet/eth.c
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@@ -161,6 +161,12 @@ __be16 eth_type_trans(struct sk_buff *sk
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const struct ethhdr *eth;
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skb->dev = dev;
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+
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+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
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+ if (dev->eth_mangle_rx)
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+ dev->eth_mangle_rx(dev, skb);
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+#endif
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+
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skb_reset_mac_header(skb);
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skb_pull_inline(skb, ETH_HLEN);
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eth = eth_hdr(skb);
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