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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * VLAN An implementation of 802.1Q VLAN tagging.
3 *
4 * Authors: Ben Greear <greearb@candelatech.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#ifndef _LINUX_IF_VLAN_H_
13#define _LINUX_IF_VLAN_H_
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/netdevice.h>
Stephen Hemminger0610d112006-07-14 16:34:22 -070016#include <linux/etherdevice.h>
Jesse Gross65ac6a52010-10-20 13:56:05 +000017#include <linux/rtnetlink.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -050018#include <linux/bug.h>
David Howells607ca462012-10-13 10:46:48 +010019#include <uapi/linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Joe Perchesa3f671b2012-03-18 17:37:56 +000021#define VLAN_HLEN 4 /* The additional bytes required by VLAN
22 * (in addition to the Ethernet header)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#define VLAN_ETH_HLEN 18 /* Total octets in header. */
25#define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */
26
27/*
28 * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan
29 */
30#define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */
31#define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */
32
Patrick McHardy740c15d2008-01-21 00:18:53 -080033/*
34 * struct vlan_hdr - vlan header
35 * @h_vlan_TCI: priority and VLAN ID
36 * @h_vlan_encapsulated_proto: packet type ID or len
37 */
38struct vlan_hdr {
39 __be16 h_vlan_TCI;
40 __be16 h_vlan_encapsulated_proto;
41};
42
43/**
44 * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr)
45 * @h_dest: destination ethernet address
46 * @h_source: source ethernet address
Olaf Heringa7bf5802013-06-14 17:07:01 +020047 * @h_vlan_proto: ethernet protocol
Patrick McHardy740c15d2008-01-21 00:18:53 -080048 * @h_vlan_TCI: priority and VLAN ID
49 * @h_vlan_encapsulated_proto: packet type ID or len
50 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070051struct vlan_ethhdr {
Patrick McHardy740c15d2008-01-21 00:18:53 -080052 unsigned char h_dest[ETH_ALEN];
53 unsigned char h_source[ETH_ALEN];
54 __be16 h_vlan_proto;
55 __be16 h_vlan_TCI;
56 __be16 h_vlan_encapsulated_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057};
58
59#include <linux/skbuff.h>
60
61static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb)
62{
Arnaldo Carvalho de Melo98e399f2007-03-19 15:33:04 -070063 return (struct vlan_ethhdr *)skb_mac_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
Eric Dumazet05423b22009-10-26 18:40:35 -070066#define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */
67#define VLAN_PRIO_SHIFT 13
68#define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */
69#define VLAN_TAG_PRESENT VLAN_CFI_MASK
70#define VLAN_VID_MASK 0x0fff /* VLAN Identifier */
Jesse Grossb7381272010-10-20 13:56:02 +000071#define VLAN_N_VID 4096
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73/* found in socket.c */
Eric W. Biederman881d9662007-09-17 11:56:21 -070074extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *));
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
Neil Horman6dcbbe22011-05-24 08:31:08 +000076static inline int is_vlan_dev(struct net_device *dev)
77{
78 return dev->priv_flags & IFF_802_1Q_VLAN;
79}
80
Eric Dumazet05423b22009-10-26 18:40:35 -070081#define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
82#define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
Eric Dumazetd4b812d2013-07-18 07:19:26 -070083#define vlan_tx_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Patrick McHardy7750f402008-07-08 03:23:36 -070085#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
Jesse Gross65ac6a52010-10-20 13:56:05 +000086
Jiri Pirkocec9c132011-07-20 04:54:05 +000087extern struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
Patrick McHardy1fd9b1f2013-04-19 02:04:29 +000088 __be16 vlan_proto, u16 vlan_id);
Patrick McHardy22d1ba72008-07-08 03:23:57 -070089extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
90extern u16 vlan_dev_vlan_id(const struct net_device *dev);
David S. Millere267cb92013-11-11 00:42:07 -050091
92/**
93 * struct vlan_priority_tci_mapping - vlan egress priority mappings
94 * @priority: skb priority
95 * @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
96 * @next: pointer to next struct
97 */
98struct vlan_priority_tci_mapping {
99 u32 priority;
100 u16 vlan_qos;
101 struct vlan_priority_tci_mapping *next;
102};
103
104/**
105 * struct vlan_pcpu_stats - VLAN percpu rx/tx stats
106 * @rx_packets: number of received packets
107 * @rx_bytes: number of received bytes
108 * @rx_multicast: number of received multicast packets
109 * @tx_packets: number of transmitted packets
110 * @tx_bytes: number of transmitted bytes
111 * @syncp: synchronization point for 64bit counters
112 * @rx_errors: number of rx errors
113 * @tx_dropped: number of tx drops
114 */
115struct vlan_pcpu_stats {
116 u64 rx_packets;
117 u64 rx_bytes;
118 u64 rx_multicast;
119 u64 tx_packets;
120 u64 tx_bytes;
121 struct u64_stats_sync syncp;
122 u32 rx_errors;
123 u32 tx_dropped;
124};
125
126struct proc_dir_entry;
127struct netpoll;
128
129/**
130 * struct vlan_dev_priv - VLAN private device data
131 * @nr_ingress_mappings: number of ingress priority mappings
132 * @ingress_priority_map: ingress priority mappings
133 * @nr_egress_mappings: number of egress priority mappings
134 * @egress_priority_map: hash of egress priority mappings
135 * @vlan_proto: VLAN encapsulation protocol
136 * @vlan_id: VLAN identifier
137 * @flags: device flags
138 * @real_dev: underlying netdevice
139 * @real_dev_addr: address of underlying netdevice
140 * @dent: proc dir entry
141 * @vlan_pcpu_stats: ptr to percpu rx stats
142 */
143struct vlan_dev_priv {
144 unsigned int nr_ingress_mappings;
145 u32 ingress_priority_map[8];
146 unsigned int nr_egress_mappings;
147 struct vlan_priority_tci_mapping *egress_priority_map[16];
148
149 __be16 vlan_proto;
150 u16 vlan_id;
151 u16 flags;
152
153 struct net_device *real_dev;
154 unsigned char real_dev_addr[ETH_ALEN];
155
156 struct proc_dir_entry *dent;
157 struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
158#ifdef CONFIG_NET_POLL_CONTROLLER
159 struct netpoll *netpoll;
160#endif
161};
162
163static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
164{
165 return netdev_priv(dev);
166}
167
168static inline u16
169vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
170{
171 struct vlan_priority_tci_mapping *mp;
172
173 smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
174
175 mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
176 while (mp) {
177 if (mp->priority == skprio) {
178 return mp->vlan_qos; /* This should already be shifted
179 * to mask correctly with the
180 * VLAN's TCI */
181 }
182 mp = mp->next;
183 }
184 return 0;
185}
186
Florian Zumbiehl48cc32d32012-10-07 15:51:58 +0000187extern bool vlan_do_receive(struct sk_buff **skb);
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000188extern struct sk_buff *vlan_untag(struct sk_buff *skb);
Patrick McHardy9b22ea52008-11-04 14:49:57 -0800189
Patrick McHardy80d5c362013-04-19 02:04:28 +0000190extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
191extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
Jiri Pirko87002b02011-12-08 04:11:17 +0000192
Jiri Pirko348a1442011-12-08 04:11:19 +0000193extern int vlan_vids_add_by_dev(struct net_device *dev,
194 const struct net_device *by_dev);
195extern void vlan_vids_del_by_dev(struct net_device *dev,
196 const struct net_device *by_dev);
Jiri Pirko9b361c12012-08-23 03:26:52 +0000197
198extern bool vlan_uses_dev(const struct net_device *dev);
Patrick McHardy7750f402008-07-08 03:23:36 -0700199#else
Jiri Pirkocec9c132011-07-20 04:54:05 +0000200static inline struct net_device *
Patrick McHardy9fae27b2013-04-20 23:51:41 +0000201__vlan_find_dev_deep(struct net_device *real_dev,
202 __be16 vlan_proto, u16 vlan_id)
Jiri Pirkocec9c132011-07-20 04:54:05 +0000203{
204 return NULL;
205}
206
Patrick McHardy22d1ba72008-07-08 03:23:57 -0700207static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
208{
209 BUG();
210 return NULL;
211}
212
213static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
214{
215 BUG();
216 return 0;
217}
218
Eyal Perryd3243532013-11-06 15:37:23 +0200219static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
220 u32 skprio)
221{
222 return 0;
223}
224
Florian Zumbiehl48cc32d32012-10-07 15:51:58 +0000225static inline bool vlan_do_receive(struct sk_buff **skb)
Patrick McHardy9b22ea52008-11-04 14:49:57 -0800226{
Jesse Gross3701e512010-10-20 13:56:06 +0000227 return false;
Patrick McHardy9b22ea52008-11-04 14:49:57 -0800228}
Herbert Xue1c096e2009-01-06 10:50:09 -0800229
David S. Miller6139e752011-04-12 19:27:51 -0700230static inline struct sk_buff *vlan_untag(struct sk_buff *skb)
Jiri Pirkobcc6d472011-04-07 19:48:33 +0000231{
232 return skb;
233}
Jiri Pirko87002b02011-12-08 04:11:17 +0000234
Patrick McHardy9fae27b2013-04-20 23:51:41 +0000235static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
Jiri Pirko87002b02011-12-08 04:11:17 +0000236{
237 return 0;
238}
239
Patrick McHardy9fae27b2013-04-20 23:51:41 +0000240static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
Jiri Pirko87002b02011-12-08 04:11:17 +0000241{
242}
Jiri Pirko348a1442011-12-08 04:11:19 +0000243
244static inline int vlan_vids_add_by_dev(struct net_device *dev,
245 const struct net_device *by_dev)
246{
247 return 0;
248}
249
250static inline void vlan_vids_del_by_dev(struct net_device *dev,
251 const struct net_device *by_dev)
252{
253}
Jiri Pirko9b361c12012-08-23 03:26:52 +0000254
255static inline bool vlan_uses_dev(const struct net_device *dev)
256{
257 return false;
258}
Patrick McHardy7750f402008-07-08 03:23:36 -0700259#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000261static inline bool vlan_hw_offload_capable(netdev_features_t features,
262 __be16 proto)
263{
264 if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
265 return true;
Patrick McHardy8ad227f2013-04-19 02:04:31 +0000266 if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
267 return true;
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000268 return false;
269}
270
Patrick McHardy9bb85822008-07-08 03:24:44 -0700271/**
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000272 * vlan_insert_tag - regular VLAN tag inserting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 * @skb: skbuff to tag
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000274 * @vlan_proto: VLAN encapsulation protocol
Patrick McHardy9bb85822008-07-08 03:24:44 -0700275 * @vlan_tci: VLAN TCI to insert
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 *
277 * Inserts the VLAN tag into @skb as part of the payload
278 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
Patrick McHardy9bb85822008-07-08 03:24:44 -0700279 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 * Following the skb_unshare() example, in case of error, the calling function
281 * doesn't have to worry about freeing the original skb.
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000282 *
283 * Does not change skb->protocol so this function can be used during receive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 */
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000285static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
286 __be16 vlan_proto, u16 vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
288 struct vlan_ethhdr *veth;
289
Patrick McHardy11a100f2008-07-08 15:36:57 -0700290 if (skb_cow_head(skb, VLAN_HLEN) < 0) {
291 kfree_skb(skb);
292 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
295
296 /* Move the mac addresses to the beginning of the new header. */
Joe Perchesa3f671b2012-03-18 17:37:56 +0000297 memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
Jarek Poplawskie4dd6182009-02-18 23:31:11 -0800298 skb->mac_header -= VLAN_HLEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 /* first, the ethernet type */
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000301 veth->h_vlan_proto = vlan_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Patrick McHardy9bb85822008-07-08 03:24:44 -0700303 /* now, the TCI */
304 veth->h_vlan_TCI = htons(vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000306 return skb;
307}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000309/**
310 * __vlan_put_tag - regular VLAN tag inserting
311 * @skb: skbuff to tag
312 * @vlan_tci: VLAN TCI to insert
313 *
314 * Inserts the VLAN tag into @skb as part of the payload
315 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
316 *
317 * Following the skb_unshare() example, in case of error, the calling function
318 * doesn't have to worry about freeing the original skb.
319 */
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000320static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb,
321 __be16 vlan_proto, u16 vlan_tci)
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000322{
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000323 skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000324 if (skb)
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000325 skb->protocol = vlan_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 return skb;
327}
328
329/**
330 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
331 * @skb: skbuff to tag
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000332 * @vlan_proto: VLAN encapsulation protocol
Patrick McHardy9bb85822008-07-08 03:24:44 -0700333 * @vlan_tci: VLAN TCI to insert
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 *
Patrick McHardy6aa895b2008-07-14 22:49:06 -0700335 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700337static inline struct sk_buff *__vlan_hwaccel_put_tag(struct sk_buff *skb,
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000338 __be16 vlan_proto,
Patrick McHardy9bb85822008-07-08 03:24:44 -0700339 u16 vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000341 skb->vlan_proto = vlan_proto;
Eric Dumazet05423b22009-10-26 18:40:35 -0700342 skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 return skb;
344}
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346/**
347 * vlan_put_tag - inserts VLAN tag according to device features
348 * @skb: skbuff to tag
Patrick McHardy9bb85822008-07-08 03:24:44 -0700349 * @vlan_tci: VLAN TCI to insert
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 *
351 * Assumes skb->dev is the target that will xmit this frame.
352 * Returns a VLAN tagged skb.
353 */
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000354static inline struct sk_buff *vlan_put_tag(struct sk_buff *skb,
355 __be16 vlan_proto, u16 vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000357 if (vlan_hw_offload_capable(skb->dev->features, vlan_proto)) {
358 return __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 } else {
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000360 return __vlan_put_tag(skb, vlan_proto, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
362}
363
364/**
365 * __vlan_get_tag - get the VLAN ID that is part of the payload
366 * @skb: skbuff to query
Patrick McHardy9bb85822008-07-08 03:24:44 -0700367 * @vlan_tci: buffer to store vlaue
368 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 * Returns error if the skb is not of VLAN type
370 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700371static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372{
373 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
374
Patrick McHardy8ad227f2013-04-19 02:04:31 +0000375 if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
376 veth->h_vlan_proto != htons(ETH_P_8021AD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Patrick McHardy9bb85822008-07-08 03:24:44 -0700379 *vlan_tci = ntohs(veth->h_vlan_TCI);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 return 0;
381}
382
383/**
384 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
385 * @skb: skbuff to query
Patrick McHardy9bb85822008-07-08 03:24:44 -0700386 * @vlan_tci: buffer to store vlaue
387 *
Patrick McHardy6aa895b2008-07-14 22:49:06 -0700388 * Returns error if @skb->vlan_tci is not set correctly
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 */
Patrick McHardy18149932008-02-05 16:20:22 -0800390static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
Patrick McHardy9bb85822008-07-08 03:24:44 -0700391 u16 *vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Patrick McHardy6aa895b2008-07-14 22:49:06 -0700393 if (vlan_tx_tag_present(skb)) {
Eric Dumazet05423b22009-10-26 18:40:35 -0700394 *vlan_tci = vlan_tx_tag_get(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return 0;
396 } else {
Patrick McHardy9bb85822008-07-08 03:24:44 -0700397 *vlan_tci = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return -EINVAL;
399 }
400}
401
402#define HAVE_VLAN_GET_TAG
403
404/**
405 * vlan_get_tag - get the VLAN ID from the skb
406 * @skb: skbuff to query
Patrick McHardy9bb85822008-07-08 03:24:44 -0700407 * @vlan_tci: buffer to store vlaue
408 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 * Returns error if the skb is not VLAN tagged
410 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700411static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
Patrick McHardyf6469682013-04-19 02:04:27 +0000413 if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
Patrick McHardy9bb85822008-07-08 03:24:44 -0700414 return __vlan_hwaccel_get_tag(skb, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 } else {
Patrick McHardy9bb85822008-07-08 03:24:44 -0700416 return __vlan_get_tag(skb, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418}
419
Hao Zheng0a85df02010-11-11 13:47:57 +0000420/**
421 * vlan_get_protocol - get protocol EtherType.
422 * @skb: skbuff to query
423 *
424 * Returns the EtherType of the packet, regardless of whether it is
425 * vlan encapsulated (normal or hardware accelerated) or not.
426 */
427static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
428{
429 __be16 protocol = 0;
430
431 if (vlan_tx_tag_present(skb) ||
432 skb->protocol != cpu_to_be16(ETH_P_8021Q))
433 protocol = skb->protocol;
434 else {
435 __be16 proto, *protop;
436 protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
437 h_vlan_encapsulated_proto),
438 sizeof(proto), &proto);
439 if (likely(protop))
440 protocol = *protop;
441 }
442
443 return protocol;
444}
Pravin B Shelar396cf942011-11-18 13:15:54 -0800445
446static inline void vlan_set_encap_proto(struct sk_buff *skb,
447 struct vlan_hdr *vhdr)
448{
449 __be16 proto;
Cong Wangda8c8722013-02-21 23:32:27 +0000450 unsigned short *rawp;
Pravin B Shelar396cf942011-11-18 13:15:54 -0800451
452 /*
453 * Was a VLAN packet, grab the encapsulated protocol, which the layer
454 * three protocols care about.
455 */
456
457 proto = vhdr->h_vlan_encapsulated_proto;
Simon Hormane5c5d222013-03-28 13:38:25 +0900458 if (ntohs(proto) >= ETH_P_802_3_MIN) {
Pravin B Shelar396cf942011-11-18 13:15:54 -0800459 skb->protocol = proto;
460 return;
461 }
462
Cong Wangda8c8722013-02-21 23:32:27 +0000463 rawp = (unsigned short *)(vhdr + 1);
464 if (*rawp == 0xFFFF)
Pravin B Shelar396cf942011-11-18 13:15:54 -0800465 /*
466 * This is a magic hack to spot IPX packets. Older Novell
467 * breaks the protocol design and runs IPX over 802.3 without
468 * an 802.2 LLC layer. We look for FFFF which isn't a used
469 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
470 * but does for the rest.
471 */
472 skb->protocol = htons(ETH_P_802_3);
473 else
474 /*
475 * Real 802.2 LLC
476 */
477 skb->protocol = htons(ETH_P_802_2);
478}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479#endif /* !(_LINUX_IF_VLAN_H_) */