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From ebca842041d737b7441748a17ffd535aab851fce Mon Sep 17 00:00:00 2001
From: Phil Sutter <phil@nwl.cc>
Date: Tue, 13 May 2014 01:32:11 +0200
Subject: [PATCH] net: allow PHY drivers to insert packet mangle hooks
---
include/linux/netdevice.h | 8 ++++++++
include/linux/skbuff.h | 14 ++++----------
include/uapi/linux/if.h | 1 +
net/Kconfig | 6 ++++++
net/core/dev.c | 36 ++++++++++++++++++++++++++++--------
net/core/skbuff.c | 17 +++++++++++++++++
net/ethernet/eth.c | 6 ++++++
7 files changed, 70 insertions(+), 18 deletions(-)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 911718f..8e8dd46 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1245,6 +1245,11 @@ struct net_device {
const struct ethtool_ops *ethtool_ops;
const struct forwarding_accel_ops *fwd_ops;
+#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
+
/* Hardware header description */
const struct header_ops *header_ops;
@@ -1313,6 +1318,9 @@ struct net_device {
void *ax25_ptr; /* AX.25 specific data */
struct wireless_dev *ieee80211_ptr; /* IEEE 802.11 specific data,
assign before registering */
+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
+ void *phy_ptr; /* PHY device specific data */
+#endif
/*
* Cache lines mostly used on receive path (including eth_type_trans())
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 15ede6a..5530766 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1858,6 +1858,10 @@ static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
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
@@ -1966,16 +1970,6 @@ static inline struct sk_buff *dev_alloc_skb(unsigned int length)
}
-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)
{
diff --git a/include/uapi/linux/if.h b/include/uapi/linux/if.h
index d758163..7ffa548 100644
--- a/include/uapi/linux/if.h
+++ b/include/uapi/linux/if.h
@@ -84,6 +84,7 @@
#define IFF_LIVE_ADDR_CHANGE 0x100000 /* device supports hardware address
* change when it's running */
#define IFF_MACVLAN 0x200000 /* Macvlan device */
+#define IFF_NO_IP_ALIGN 0x400000 /* do not ip-align allocated rx pkts */
#define IF_GET_IFACE 0x0001 /* for querying only */
diff --git a/net/Kconfig b/net/Kconfig
index e411046..970c52a 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -24,6 +24,12 @@ 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
diff --git a/net/core/dev.c b/net/core/dev.c
index fccc195..2e0ba23 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2607,10 +2607,20 @@ int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
if (!list_empty(&ptype_all))
dev_queue_xmit_nit(skb, dev);
- skb_len = skb->len;
- trace_net_dev_start_xmit(skb, dev);
- rc = ops->ndo_start_xmit(skb, dev);
- trace_net_dev_xmit(skb, rc, dev, skb_len);
+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
+ if (!dev->eth_mangle_tx ||
+ (skb = dev->eth_mangle_tx(dev, skb)) != NULL)
+#else
+ if (1)
+#endif
+ {
+ skb_len = skb->len;
+ trace_net_dev_start_xmit(skb, dev);
+ rc = ops->ndo_start_xmit(skb, dev);
+ trace_net_dev_xmit(skb, rc, dev, skb_len);
+ } else {
+ rc = NETDEV_TX_OK;
+ }
if (rc == NETDEV_TX_OK)
txq_trans_update(txq);
return rc;
@@ -2626,10 +2636,20 @@ gso:
if (!list_empty(&ptype_all))
dev_queue_xmit_nit(nskb, dev);
- skb_len = nskb->len;
- trace_net_dev_start_xmit(nskb, dev);
- rc = ops->ndo_start_xmit(nskb, dev);
- trace_net_dev_xmit(nskb, rc, dev, skb_len);
+#ifdef CONFIG_ETHERNET_PACKET_MANGLE
+ if (!dev->eth_mangle_tx ||
+ (nskb = dev->eth_mangle_tx(dev, nskb)) != NULL)
+#else
+ if (1)
+#endif
+ {
+ skb_len = nskb->len;
+ trace_net_dev_start_xmit(nskb, dev);
+ rc = ops->ndo_start_xmit(nskb, dev);
+ trace_net_dev_xmit(nskb, rc, dev, skb_len);
+ } else {
+ rc = NETDEV_TX_OK;
+ }
if (unlikely(rc != NETDEV_TX_OK)) {
if (rc & ~NETDEV_TX_MASK)
goto out_kfree_gso_skb;
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index e5ae776e..400ff2a 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -62,6 +62,7 @@
#include <linux/scatterlist.h>
#include <linux/errqueue.h>
#include <linux/prefetch.h>
+#include <uapi/linux/if.h>
#include <net/protocol.h>
#include <net/dst.h>
@@ -439,6 +440,22 @@ struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
}
EXPORT_SYMBOL(__netdev_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)
{
diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
index 5dc638c..f4fd124 100644
--- a/net/ethernet/eth.c
+++ b/net/ethernet/eth.c
@@ -161,6 +161,12 @@ __be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
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);
skb_pull_inline(skb, ETH_HLEN);
eth = eth_hdr(skb);
--
1.8.5.3
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