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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
Vlad Yasevichd38569a2014-05-16 17:04:55 -040076static inline bool is_vlan_dev(struct net_device *dev)
Neil Horman6dcbbe22011-05-24 08:31:08 +000077{
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
David S. Millere267cb92013-11-11 00:42:07 -050085/**
86 * struct vlan_pcpu_stats - VLAN percpu rx/tx stats
87 * @rx_packets: number of received packets
88 * @rx_bytes: number of received bytes
89 * @rx_multicast: number of received multicast packets
90 * @tx_packets: number of transmitted packets
91 * @tx_bytes: number of transmitted bytes
92 * @syncp: synchronization point for 64bit counters
93 * @rx_errors: number of rx errors
94 * @tx_dropped: number of tx drops
95 */
96struct vlan_pcpu_stats {
97 u64 rx_packets;
98 u64 rx_bytes;
99 u64 rx_multicast;
100 u64 tx_packets;
101 u64 tx_bytes;
102 struct u64_stats_sync syncp;
103 u32 rx_errors;
104 u32 tx_dropped;
105};
106
Hannes Frederic Sowa1e85c9b2014-01-06 01:41:20 +0100107#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
108
dingtianhongf06c7f92014-05-09 14:58:05 +0800109extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev,
Hannes Frederic Sowa1e85c9b2014-01-06 01:41:20 +0100110 __be16 vlan_proto, u16 vlan_id);
111extern struct net_device *vlan_dev_real_dev(const struct net_device *dev);
112extern u16 vlan_dev_vlan_id(const struct net_device *dev);
dingtianhong71e415e2014-03-25 17:44:42 +0800113extern __be16 vlan_dev_vlan_proto(const struct net_device *dev);
Hannes Frederic Sowa1e85c9b2014-01-06 01:41:20 +0100114
115/**
116 * struct vlan_priority_tci_mapping - vlan egress priority mappings
117 * @priority: skb priority
118 * @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000
119 * @next: pointer to next struct
120 */
121struct vlan_priority_tci_mapping {
122 u32 priority;
123 u16 vlan_qos;
124 struct vlan_priority_tci_mapping *next;
125};
126
David S. Millere267cb92013-11-11 00:42:07 -0500127struct proc_dir_entry;
128struct netpoll;
129
130/**
131 * struct vlan_dev_priv - VLAN private device data
132 * @nr_ingress_mappings: number of ingress priority mappings
133 * @ingress_priority_map: ingress priority mappings
134 * @nr_egress_mappings: number of egress priority mappings
135 * @egress_priority_map: hash of egress priority mappings
136 * @vlan_proto: VLAN encapsulation protocol
137 * @vlan_id: VLAN identifier
138 * @flags: device flags
139 * @real_dev: underlying netdevice
140 * @real_dev_addr: address of underlying netdevice
141 * @dent: proc dir entry
142 * @vlan_pcpu_stats: ptr to percpu rx stats
143 */
144struct vlan_dev_priv {
145 unsigned int nr_ingress_mappings;
146 u32 ingress_priority_map[8];
147 unsigned int nr_egress_mappings;
148 struct vlan_priority_tci_mapping *egress_priority_map[16];
149
150 __be16 vlan_proto;
151 u16 vlan_id;
152 u16 flags;
153
154 struct net_device *real_dev;
155 unsigned char real_dev_addr[ETH_ALEN];
156
157 struct proc_dir_entry *dent;
158 struct vlan_pcpu_stats __percpu *vlan_pcpu_stats;
159#ifdef CONFIG_NET_POLL_CONTROLLER
160 struct netpoll *netpoll;
161#endif
Vlad Yasevichd38569a2014-05-16 17:04:55 -0400162 unsigned int nest_level;
David S. Millere267cb92013-11-11 00:42:07 -0500163};
164
165static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev)
166{
167 return netdev_priv(dev);
168}
169
170static inline u16
171vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio)
172{
173 struct vlan_priority_tci_mapping *mp;
174
175 smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
176
177 mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)];
178 while (mp) {
179 if (mp->priority == skprio) {
180 return mp->vlan_qos; /* This should already be shifted
181 * to mask correctly with the
182 * VLAN's TCI */
183 }
184 mp = mp->next;
185 }
186 return 0;
187}
188
Florian Zumbiehl48cc32d32012-10-07 15:51:58 +0000189extern bool vlan_do_receive(struct sk_buff **skb);
Patrick McHardy9b22ea52008-11-04 14:49:57 -0800190
Patrick McHardy80d5c362013-04-19 02:04:28 +0000191extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid);
192extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid);
Jiri Pirko87002b02011-12-08 04:11:17 +0000193
Jiri Pirko348a1442011-12-08 04:11:19 +0000194extern int vlan_vids_add_by_dev(struct net_device *dev,
195 const struct net_device *by_dev);
196extern void vlan_vids_del_by_dev(struct net_device *dev,
197 const struct net_device *by_dev);
Jiri Pirko9b361c12012-08-23 03:26:52 +0000198
199extern bool vlan_uses_dev(const struct net_device *dev);
Vlad Yaseviche1618d42014-05-20 10:59:26 -0400200
201static inline int vlan_get_encap_level(struct net_device *dev)
202{
203 BUG_ON(!is_vlan_dev(dev));
204 return vlan_dev_priv(dev)->nest_level;
205}
Patrick McHardy7750f402008-07-08 03:23:36 -0700206#else
Jiri Pirkocec9c132011-07-20 04:54:05 +0000207static inline struct net_device *
dingtianhongf06c7f92014-05-09 14:58:05 +0800208__vlan_find_dev_deep_rcu(struct net_device *real_dev,
Patrick McHardy9fae27b2013-04-20 23:51:41 +0000209 __be16 vlan_proto, u16 vlan_id)
Jiri Pirkocec9c132011-07-20 04:54:05 +0000210{
211 return NULL;
212}
213
Patrick McHardy22d1ba72008-07-08 03:23:57 -0700214static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev)
215{
216 BUG();
217 return NULL;
218}
219
220static inline u16 vlan_dev_vlan_id(const struct net_device *dev)
221{
222 BUG();
223 return 0;
224}
225
dingtianhong71e415e2014-03-25 17:44:42 +0800226static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev)
227{
228 BUG();
229 return 0;
230}
231
Eyal Perryd3243532013-11-06 15:37:23 +0200232static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev,
233 u32 skprio)
234{
235 return 0;
236}
237
Florian Zumbiehl48cc32d32012-10-07 15:51:58 +0000238static inline bool vlan_do_receive(struct sk_buff **skb)
Patrick McHardy9b22ea52008-11-04 14:49:57 -0800239{
Jesse Gross3701e512010-10-20 13:56:06 +0000240 return false;
Patrick McHardy9b22ea52008-11-04 14:49:57 -0800241}
Herbert Xue1c096e2009-01-06 10:50:09 -0800242
Patrick McHardy9fae27b2013-04-20 23:51:41 +0000243static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
Jiri Pirko87002b02011-12-08 04:11:17 +0000244{
245 return 0;
246}
247
Patrick McHardy9fae27b2013-04-20 23:51:41 +0000248static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
Jiri Pirko87002b02011-12-08 04:11:17 +0000249{
250}
Jiri Pirko348a1442011-12-08 04:11:19 +0000251
252static inline int vlan_vids_add_by_dev(struct net_device *dev,
253 const struct net_device *by_dev)
254{
255 return 0;
256}
257
258static inline void vlan_vids_del_by_dev(struct net_device *dev,
259 const struct net_device *by_dev)
260{
261}
Jiri Pirko9b361c12012-08-23 03:26:52 +0000262
263static inline bool vlan_uses_dev(const struct net_device *dev)
264{
265 return false;
266}
Vlad Yaseviche1618d42014-05-20 10:59:26 -0400267static inline int vlan_get_encap_level(struct net_device *dev)
268{
269 BUG();
270 return 0;
271}
Patrick McHardy7750f402008-07-08 03:23:36 -0700272#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000274static inline bool vlan_hw_offload_capable(netdev_features_t features,
275 __be16 proto)
276{
277 if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX)
278 return true;
Patrick McHardy8ad227f2013-04-19 02:04:31 +0000279 if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX)
280 return true;
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000281 return false;
282}
283
Patrick McHardy9bb85822008-07-08 03:24:44 -0700284/**
Jiri Pirko15255a42014-11-19 14:05:00 +0100285 * __vlan_insert_tag - regular VLAN tag inserting
286 * @skb: skbuff to tag
287 * @vlan_proto: VLAN encapsulation protocol
288 * @vlan_tci: VLAN TCI to insert
289 *
290 * Inserts the VLAN tag into @skb as part of the payload
291 * Returns error if skb_cow_head failes.
292 *
293 * Does not change skb->protocol so this function can be used during receive.
294 */
295static inline int __vlan_insert_tag(struct sk_buff *skb,
296 __be16 vlan_proto, u16 vlan_tci)
297{
298 struct vlan_ethhdr *veth;
299
300 if (skb_cow_head(skb, VLAN_HLEN) < 0)
301 return -ENOMEM;
302
303 veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);
304
305 /* Move the mac addresses to the beginning of the new header. */
306 memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);
307 skb->mac_header -= VLAN_HLEN;
308
309 /* first, the ethernet type */
310 veth->h_vlan_proto = vlan_proto;
311
312 /* now, the TCI */
313 veth->h_vlan_TCI = htons(vlan_tci);
314
315 return 0;
316}
317
318/**
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000319 * vlan_insert_tag - regular VLAN tag inserting
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 * @skb: skbuff to tag
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000321 * @vlan_proto: VLAN encapsulation protocol
Patrick McHardy9bb85822008-07-08 03:24:44 -0700322 * @vlan_tci: VLAN TCI to insert
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 *
324 * Inserts the VLAN tag into @skb as part of the payload
325 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
Patrick McHardy9bb85822008-07-08 03:24:44 -0700326 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 * Following the skb_unshare() example, in case of error, the calling function
328 * doesn't have to worry about freeing the original skb.
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000329 *
330 * Does not change skb->protocol so this function can be used during receive.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 */
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000332static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb,
333 __be16 vlan_proto, u16 vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
Jiri Pirko15255a42014-11-19 14:05:00 +0100335 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
Jiri Pirko15255a42014-11-19 14:05:00 +0100337 err = __vlan_insert_tag(skb, vlan_proto, vlan_tci);
338 if (err) {
Eric W. Biedermanfb7c03d2014-03-20 19:50:33 -0700339 dev_kfree_skb_any(skb);
Patrick McHardy11a100f2008-07-08 15:36:57 -0700340 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000342 return skb;
343}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000345/**
Jiri Pirko62749e22014-11-19 14:04:58 +0100346 * vlan_insert_tag_set_proto - regular VLAN tag inserting
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000347 * @skb: skbuff to tag
Jiri Pirko62749e22014-11-19 14:04:58 +0100348 * @vlan_proto: VLAN encapsulation protocol
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000349 * @vlan_tci: VLAN TCI to insert
350 *
351 * Inserts the VLAN tag into @skb as part of the payload
352 * Returns a VLAN tagged skb. If a new skb is created, @skb is freed.
353 *
354 * Following the skb_unshare() example, in case of error, the calling function
355 * doesn't have to worry about freeing the original skb.
356 */
Jiri Pirko62749e22014-11-19 14:04:58 +0100357static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb,
358 __be16 vlan_proto,
359 u16 vlan_tci)
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000360{
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000361 skb = vlan_insert_tag(skb, vlan_proto, vlan_tci);
Jiri Pirko0b5c9db2011-06-10 06:56:58 +0000362 if (skb)
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000363 skb->protocol = vlan_proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 return skb;
365}
366
Jiri Pirko59682502014-11-19 14:04:59 +0100367/*
368 * __vlan_hwaccel_push_inside - pushes vlan tag to the payload
369 * @skb: skbuff to tag
370 *
371 * Pushes the VLAN tag from @skb->vlan_tci inside to the payload.
372 *
373 * Following the skb_unshare() example, in case of error, the calling function
374 * doesn't have to worry about freeing the original skb.
375 */
376static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb)
377{
378 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
379 vlan_tx_tag_get(skb));
380 if (likely(skb))
381 skb->vlan_tci = 0;
382 return skb;
383}
384/*
385 * vlan_hwaccel_push_inside - pushes vlan tag to the payload
386 * @skb: skbuff to tag
387 *
388 * Checks is tag is present in @skb->vlan_tci and if it is, it pushes the
389 * VLAN tag from @skb->vlan_tci inside to the payload.
390 *
391 * Following the skb_unshare() example, in case of error, the calling function
392 * doesn't have to worry about freeing the original skb.
393 */
394static inline struct sk_buff *vlan_hwaccel_push_inside(struct sk_buff *skb)
395{
396 if (vlan_tx_tag_present(skb))
397 skb = __vlan_hwaccel_push_inside(skb);
398 return skb;
399}
400
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401/**
402 * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting
403 * @skb: skbuff to tag
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000404 * @vlan_proto: VLAN encapsulation protocol
Patrick McHardy9bb85822008-07-08 03:24:44 -0700405 * @vlan_tci: VLAN TCI to insert
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 *
Patrick McHardy6aa895b02008-07-14 22:49:06 -0700407 * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 */
Jiri Pirkob960a0ac2014-11-19 14:04:56 +0100409static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb,
410 __be16 vlan_proto, u16 vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000412 skb->vlan_proto = vlan_proto;
Eric Dumazet05423b22009-10-26 18:40:35 -0700413 skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 * __vlan_get_tag - get the VLAN ID that is part of the payload
418 * @skb: skbuff to query
Patrick McHardy9bb85822008-07-08 03:24:44 -0700419 * @vlan_tci: buffer to store vlaue
420 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 * Returns error if the skb is not of VLAN type
422 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700423static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424{
425 struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data;
426
Patrick McHardy8ad227f2013-04-19 02:04:31 +0000427 if (veth->h_vlan_proto != htons(ETH_P_8021Q) &&
428 veth->h_vlan_proto != htons(ETH_P_8021AD))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Patrick McHardy9bb85822008-07-08 03:24:44 -0700431 *vlan_tci = ntohs(veth->h_vlan_TCI);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 return 0;
433}
434
435/**
436 * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[]
437 * @skb: skbuff to query
Patrick McHardy9bb85822008-07-08 03:24:44 -0700438 * @vlan_tci: buffer to store vlaue
439 *
Patrick McHardy6aa895b02008-07-14 22:49:06 -0700440 * Returns error if @skb->vlan_tci is not set correctly
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 */
Patrick McHardy18149932008-02-05 16:20:22 -0800442static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb,
Patrick McHardy9bb85822008-07-08 03:24:44 -0700443 u16 *vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
Patrick McHardy6aa895b02008-07-14 22:49:06 -0700445 if (vlan_tx_tag_present(skb)) {
Eric Dumazet05423b22009-10-26 18:40:35 -0700446 *vlan_tci = vlan_tx_tag_get(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 return 0;
448 } else {
Patrick McHardy9bb85822008-07-08 03:24:44 -0700449 *vlan_tci = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return -EINVAL;
451 }
452}
453
454#define HAVE_VLAN_GET_TAG
455
456/**
457 * vlan_get_tag - get the VLAN ID from the skb
458 * @skb: skbuff to query
Patrick McHardy9bb85822008-07-08 03:24:44 -0700459 * @vlan_tci: buffer to store vlaue
460 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 * Returns error if the skb is not VLAN tagged
462 */
Patrick McHardy9bb85822008-07-08 03:24:44 -0700463static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Patrick McHardyf6469682013-04-19 02:04:27 +0000465 if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) {
Patrick McHardy9bb85822008-07-08 03:24:44 -0700466 return __vlan_hwaccel_get_tag(skb, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 } else {
Patrick McHardy9bb85822008-07-08 03:24:44 -0700468 return __vlan_get_tag(skb, vlan_tci);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 }
470}
471
Hao Zheng0a85df02010-11-11 13:47:57 +0000472/**
473 * vlan_get_protocol - get protocol EtherType.
474 * @skb: skbuff to query
475 *
476 * Returns the EtherType of the packet, regardless of whether it is
477 * vlan encapsulated (normal or hardware accelerated) or not.
478 */
479static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
480{
481 __be16 protocol = 0;
482
483 if (vlan_tx_tag_present(skb) ||
484 skb->protocol != cpu_to_be16(ETH_P_8021Q))
485 protocol = skb->protocol;
486 else {
487 __be16 proto, *protop;
488 protop = skb_header_pointer(skb, offsetof(struct vlan_ethhdr,
489 h_vlan_encapsulated_proto),
490 sizeof(proto), &proto);
491 if (likely(protop))
492 protocol = *protop;
493 }
494
495 return protocol;
496}
Pravin B Shelar396cf942011-11-18 13:15:54 -0800497
498static inline void vlan_set_encap_proto(struct sk_buff *skb,
499 struct vlan_hdr *vhdr)
500{
501 __be16 proto;
Cong Wangda8c8722013-02-21 23:32:27 +0000502 unsigned short *rawp;
Pravin B Shelar396cf942011-11-18 13:15:54 -0800503
504 /*
505 * Was a VLAN packet, grab the encapsulated protocol, which the layer
506 * three protocols care about.
507 */
508
509 proto = vhdr->h_vlan_encapsulated_proto;
Simon Hormane5c5d222013-03-28 13:38:25 +0900510 if (ntohs(proto) >= ETH_P_802_3_MIN) {
Pravin B Shelar396cf942011-11-18 13:15:54 -0800511 skb->protocol = proto;
512 return;
513 }
514
Cong Wangda8c8722013-02-21 23:32:27 +0000515 rawp = (unsigned short *)(vhdr + 1);
516 if (*rawp == 0xFFFF)
Pravin B Shelar396cf942011-11-18 13:15:54 -0800517 /*
518 * This is a magic hack to spot IPX packets. Older Novell
519 * breaks the protocol design and runs IPX over 802.3 without
520 * an 802.2 LLC layer. We look for FFFF which isn't a used
521 * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
522 * but does for the rest.
523 */
524 skb->protocol = htons(ETH_P_802_3);
525 else
526 /*
527 * Real 802.2 LLC
528 */
529 skb->protocol = htons(ETH_P_802_2);
530}
Vlad Yasevich44a40852014-05-16 17:20:38 -0400531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532#endif /* !(_LINUX_IF_VLAN_H_) */