summaryrefslogtreecommitdiff
path: root/target/mips/dragino-ms14s/patches/3.14.35/0018-net-allow-PHY-drivers-to-insert-packet-mangle-hooks.patch
blob: 6a372c8f13cef014b9452badd039f4e153652a37 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
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