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1da177e4 LT |
1 | /* |
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 | */ | |
1da177e4 LT |
12 | #ifndef _LINUX_IF_VLAN_H_ |
13 | #define _LINUX_IF_VLAN_H_ | |
14 | ||
1da177e4 | 15 | #include <linux/netdevice.h> |
0610d11b | 16 | #include <linux/etherdevice.h> |
65ac6a5f | 17 | #include <linux/rtnetlink.h> |
187f1882 | 18 | #include <linux/bug.h> |
607ca46e | 19 | #include <uapi/linux/if_vlan.h> |
1da177e4 | 20 | |
a3f671b3 JP |
21 | #define VLAN_HLEN 4 /* The additional bytes required by VLAN |
22 | * (in addition to the Ethernet header) | |
1da177e4 | 23 | */ |
1da177e4 LT |
24 | #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 | ||
740c15d0 PM |
33 | /* |
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 | */ | |
38 | struct 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 | |
a7bf5804 | 47 | * @h_vlan_proto: ethernet protocol |
740c15d0 PM |
48 | * @h_vlan_TCI: priority and VLAN ID |
49 | * @h_vlan_encapsulated_proto: packet type ID or len | |
50 | */ | |
1da177e4 | 51 | struct vlan_ethhdr { |
740c15d0 PM |
52 | 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; | |
1da177e4 LT |
57 | }; |
58 | ||
59 | #include <linux/skbuff.h> | |
60 | ||
61 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | |
62 | { | |
98e399f8 | 63 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
1da177e4 LT |
64 | } |
65 | ||
05423b24 ED |
66 | #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 */ | |
b738127d | 71 | #define VLAN_N_VID 4096 |
1da177e4 LT |
72 | |
73 | /* found in socket.c */ | |
881d966b | 74 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 75 | |
b618aaa9 | 76 | static inline bool is_vlan_dev(const struct net_device *dev) |
6dcbbe25 NH |
77 | { |
78 | return dev->priv_flags & IFF_802_1Q_VLAN; | |
79 | } | |
80 | ||
df8a39de JP |
81 | #define skb_vlan_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
82 | #define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) | |
83 | #define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK) | |
f6a66927 | 84 | #define skb_vlan_tag_get_prio(__skb) ((__skb)->vlan_tci & VLAN_PRIO_MASK) |
1da177e4 | 85 | |
9daae9bd GP |
86 | static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev) |
87 | { | |
88 | ASSERT_RTNL(); | |
89 | return notifier_to_errno(call_netdevice_notifiers(NETDEV_CVLAN_FILTER_PUSH_INFO, dev)); | |
90 | } | |
91 | ||
92 | static inline void vlan_drop_rx_ctag_filter_info(struct net_device *dev) | |
93 | { | |
94 | ASSERT_RTNL(); | |
95 | call_netdevice_notifiers(NETDEV_CVLAN_FILTER_DROP_INFO, dev); | |
96 | } | |
97 | ||
98 | static inline int vlan_get_rx_stag_filter_info(struct net_device *dev) | |
99 | { | |
100 | ASSERT_RTNL(); | |
101 | return notifier_to_errno(call_netdevice_notifiers(NETDEV_SVLAN_FILTER_PUSH_INFO, dev)); | |
102 | } | |
103 | ||
104 | static inline void vlan_drop_rx_stag_filter_info(struct net_device *dev) | |
105 | { | |
106 | ASSERT_RTNL(); | |
107 | call_netdevice_notifiers(NETDEV_SVLAN_FILTER_DROP_INFO, dev); | |
108 | } | |
109 | ||
e267cb96 DM |
110 | /** |
111 | * struct vlan_pcpu_stats - VLAN percpu rx/tx stats | |
112 | * @rx_packets: number of received packets | |
113 | * @rx_bytes: number of received bytes | |
114 | * @rx_multicast: number of received multicast packets | |
115 | * @tx_packets: number of transmitted packets | |
116 | * @tx_bytes: number of transmitted bytes | |
117 | * @syncp: synchronization point for 64bit counters | |
118 | * @rx_errors: number of rx errors | |
119 | * @tx_dropped: number of tx drops | |
120 | */ | |
121 | struct vlan_pcpu_stats { | |
122 | u64 rx_packets; | |
123 | u64 rx_bytes; | |
124 | u64 rx_multicast; | |
125 | u64 tx_packets; | |
126 | u64 tx_bytes; | |
127 | struct u64_stats_sync syncp; | |
128 | u32 rx_errors; | |
129 | u32 tx_dropped; | |
130 | }; | |
131 | ||
1e85c9b6 HFS |
132 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
133 | ||
f06c7f9f | 134 | extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev, |
1e85c9b6 HFS |
135 | __be16 vlan_proto, u16 vlan_id); |
136 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); | |
137 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
71e415e4 | 138 | extern __be16 vlan_dev_vlan_proto(const struct net_device *dev); |
1e85c9b6 HFS |
139 | |
140 | /** | |
141 | * struct vlan_priority_tci_mapping - vlan egress priority mappings | |
142 | * @priority: skb priority | |
143 | * @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000 | |
144 | * @next: pointer to next struct | |
145 | */ | |
146 | struct vlan_priority_tci_mapping { | |
147 | u32 priority; | |
148 | u16 vlan_qos; | |
149 | struct vlan_priority_tci_mapping *next; | |
150 | }; | |
151 | ||
e267cb96 DM |
152 | struct proc_dir_entry; |
153 | struct netpoll; | |
154 | ||
155 | /** | |
156 | * struct vlan_dev_priv - VLAN private device data | |
157 | * @nr_ingress_mappings: number of ingress priority mappings | |
158 | * @ingress_priority_map: ingress priority mappings | |
159 | * @nr_egress_mappings: number of egress priority mappings | |
160 | * @egress_priority_map: hash of egress priority mappings | |
161 | * @vlan_proto: VLAN encapsulation protocol | |
162 | * @vlan_id: VLAN identifier | |
163 | * @flags: device flags | |
164 | * @real_dev: underlying netdevice | |
165 | * @real_dev_addr: address of underlying netdevice | |
166 | * @dent: proc dir entry | |
167 | * @vlan_pcpu_stats: ptr to percpu rx stats | |
168 | */ | |
169 | struct vlan_dev_priv { | |
170 | unsigned int nr_ingress_mappings; | |
171 | u32 ingress_priority_map[8]; | |
172 | unsigned int nr_egress_mappings; | |
173 | struct vlan_priority_tci_mapping *egress_priority_map[16]; | |
174 | ||
175 | __be16 vlan_proto; | |
176 | u16 vlan_id; | |
177 | u16 flags; | |
178 | ||
179 | struct net_device *real_dev; | |
180 | unsigned char real_dev_addr[ETH_ALEN]; | |
181 | ||
182 | struct proc_dir_entry *dent; | |
183 | struct vlan_pcpu_stats __percpu *vlan_pcpu_stats; | |
184 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
185 | struct netpoll *netpoll; | |
186 | #endif | |
d38569ab | 187 | unsigned int nest_level; |
e267cb96 DM |
188 | }; |
189 | ||
190 | static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev) | |
191 | { | |
192 | return netdev_priv(dev); | |
193 | } | |
194 | ||
195 | static inline u16 | |
196 | vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio) | |
197 | { | |
198 | struct vlan_priority_tci_mapping *mp; | |
199 | ||
200 | smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */ | |
201 | ||
202 | mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)]; | |
203 | while (mp) { | |
204 | if (mp->priority == skprio) { | |
205 | return mp->vlan_qos; /* This should already be shifted | |
206 | * to mask correctly with the | |
207 | * VLAN's TCI */ | |
208 | } | |
209 | mp = mp->next; | |
210 | } | |
211 | return 0; | |
212 | } | |
213 | ||
48cc32d3 | 214 | extern bool vlan_do_receive(struct sk_buff **skb); |
9b22ea56 | 215 | |
80d5c368 PM |
216 | extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid); |
217 | extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid); | |
87002b03 | 218 | |
348a1443 JP |
219 | extern int vlan_vids_add_by_dev(struct net_device *dev, |
220 | const struct net_device *by_dev); | |
221 | extern void vlan_vids_del_by_dev(struct net_device *dev, | |
222 | const struct net_device *by_dev); | |
9b361c13 JP |
223 | |
224 | extern bool vlan_uses_dev(const struct net_device *dev); | |
e1618d46 VY |
225 | |
226 | static inline int vlan_get_encap_level(struct net_device *dev) | |
227 | { | |
228 | BUG_ON(!is_vlan_dev(dev)); | |
229 | return vlan_dev_priv(dev)->nest_level; | |
230 | } | |
7750f403 | 231 | #else |
cec9c133 | 232 | static inline struct net_device * |
f06c7f9f | 233 | __vlan_find_dev_deep_rcu(struct net_device *real_dev, |
9fae27b3 | 234 | __be16 vlan_proto, u16 vlan_id) |
cec9c133 JP |
235 | { |
236 | return NULL; | |
237 | } | |
238 | ||
22d1ba74 PM |
239 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
240 | { | |
241 | BUG(); | |
242 | return NULL; | |
243 | } | |
244 | ||
245 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
246 | { | |
247 | BUG(); | |
248 | return 0; | |
249 | } | |
250 | ||
71e415e4 | 251 | static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev) |
252 | { | |
253 | BUG(); | |
254 | return 0; | |
255 | } | |
256 | ||
d3243539 EP |
257 | static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev, |
258 | u32 skprio) | |
259 | { | |
260 | return 0; | |
261 | } | |
262 | ||
48cc32d3 | 263 | static inline bool vlan_do_receive(struct sk_buff **skb) |
9b22ea56 | 264 | { |
3701e513 | 265 | return false; |
9b22ea56 | 266 | } |
e1c096e2 | 267 | |
9fae27b3 | 268 | static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
87002b03 JP |
269 | { |
270 | return 0; | |
271 | } | |
272 | ||
9fae27b3 | 273 | static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
87002b03 JP |
274 | { |
275 | } | |
348a1443 JP |
276 | |
277 | static inline int vlan_vids_add_by_dev(struct net_device *dev, | |
278 | const struct net_device *by_dev) | |
279 | { | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static inline void vlan_vids_del_by_dev(struct net_device *dev, | |
284 | const struct net_device *by_dev) | |
285 | { | |
286 | } | |
9b361c13 JP |
287 | |
288 | static inline bool vlan_uses_dev(const struct net_device *dev) | |
289 | { | |
290 | return false; | |
291 | } | |
e1618d46 VY |
292 | static inline int vlan_get_encap_level(struct net_device *dev) |
293 | { | |
294 | BUG(); | |
295 | return 0; | |
296 | } | |
7750f403 | 297 | #endif |
1da177e4 | 298 | |
fe19c4f9 EG |
299 | /** |
300 | * eth_type_vlan - check for valid vlan ether type. | |
301 | * @ethertype: ether type to check | |
302 | * | |
303 | * Returns true if the ether type is a vlan ether type. | |
304 | */ | |
305 | static inline bool eth_type_vlan(__be16 ethertype) | |
306 | { | |
307 | switch (ethertype) { | |
308 | case htons(ETH_P_8021Q): | |
309 | case htons(ETH_P_8021AD): | |
310 | return true; | |
311 | default: | |
312 | return false; | |
313 | } | |
314 | } | |
315 | ||
86a9bad3 PM |
316 | static inline bool vlan_hw_offload_capable(netdev_features_t features, |
317 | __be16 proto) | |
318 | { | |
319 | if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX) | |
320 | return true; | |
8ad227ff PM |
321 | if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX) |
322 | return true; | |
86a9bad3 PM |
323 | return false; |
324 | } | |
325 | ||
1da177e4 | 326 | /** |
cbe7128c | 327 | * __vlan_insert_inner_tag - inner VLAN tag inserting |
1da177e4 | 328 | * @skb: skbuff to tag |
86a9bad3 | 329 | * @vlan_proto: VLAN encapsulation protocol |
9bb8582e | 330 | * @vlan_tci: VLAN TCI to insert |
cbe7128c | 331 | * @mac_len: MAC header length including outer vlan headers |
1da177e4 | 332 | * |
cbe7128c | 333 | * Inserts the VLAN tag into @skb as part of the payload at offset mac_len |
8051ac76 | 334 | * Returns error if skb_cow_head fails. |
0b5c9db1 JP |
335 | * |
336 | * Does not change skb->protocol so this function can be used during receive. | |
1da177e4 | 337 | */ |
cbe7128c TM |
338 | static inline int __vlan_insert_inner_tag(struct sk_buff *skb, |
339 | __be16 vlan_proto, u16 vlan_tci, | |
340 | unsigned int mac_len) | |
1da177e4 LT |
341 | { |
342 | struct vlan_ethhdr *veth; | |
343 | ||
15255a43 JP |
344 | if (skb_cow_head(skb, VLAN_HLEN) < 0) |
345 | return -ENOMEM; | |
346 | ||
cbe7128c | 347 | skb_push(skb, VLAN_HLEN); |
1da177e4 | 348 | |
cbe7128c | 349 | /* Move the mac header sans proto to the beginning of the new header. */ |
c769accd TM |
350 | if (likely(mac_len > ETH_TLEN)) |
351 | memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN); | |
e4dd6188 | 352 | skb->mac_header -= VLAN_HLEN; |
1da177e4 | 353 | |
cbe7128c TM |
354 | veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN); |
355 | ||
1da177e4 | 356 | /* first, the ethernet type */ |
c769accd TM |
357 | if (likely(mac_len >= ETH_TLEN)) { |
358 | /* h_vlan_encapsulated_proto should already be populated, and | |
359 | * skb->data has space for h_vlan_proto | |
360 | */ | |
361 | veth->h_vlan_proto = vlan_proto; | |
362 | } else { | |
363 | /* h_vlan_encapsulated_proto should not be populated, and | |
364 | * skb->data has no space for h_vlan_proto | |
365 | */ | |
366 | veth->h_vlan_encapsulated_proto = skb->protocol; | |
367 | } | |
1da177e4 | 368 | |
9bb8582e PM |
369 | /* now, the TCI */ |
370 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 371 | |
15255a43 JP |
372 | return 0; |
373 | } | |
374 | ||
375 | /** | |
cbe7128c | 376 | * __vlan_insert_tag - regular VLAN tag inserting |
15255a43 JP |
377 | * @skb: skbuff to tag |
378 | * @vlan_proto: VLAN encapsulation protocol | |
379 | * @vlan_tci: VLAN TCI to insert | |
380 | * | |
381 | * Inserts the VLAN tag into @skb as part of the payload | |
8051ac76 | 382 | * Returns error if skb_cow_head fails. |
cbe7128c TM |
383 | * |
384 | * Does not change skb->protocol so this function can be used during receive. | |
385 | */ | |
386 | static inline int __vlan_insert_tag(struct sk_buff *skb, | |
387 | __be16 vlan_proto, u16 vlan_tci) | |
388 | { | |
389 | return __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN); | |
390 | } | |
391 | ||
392 | /** | |
393 | * vlan_insert_inner_tag - inner VLAN tag inserting | |
394 | * @skb: skbuff to tag | |
395 | * @vlan_proto: VLAN encapsulation protocol | |
396 | * @vlan_tci: VLAN TCI to insert | |
397 | * @mac_len: MAC header length including outer vlan headers | |
398 | * | |
399 | * Inserts the VLAN tag into @skb as part of the payload at offset mac_len | |
15255a43 JP |
400 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
401 | * | |
402 | * Following the skb_unshare() example, in case of error, the calling function | |
403 | * doesn't have to worry about freeing the original skb. | |
404 | * | |
405 | * Does not change skb->protocol so this function can be used during receive. | |
406 | */ | |
cbe7128c TM |
407 | static inline struct sk_buff *vlan_insert_inner_tag(struct sk_buff *skb, |
408 | __be16 vlan_proto, | |
409 | u16 vlan_tci, | |
410 | unsigned int mac_len) | |
15255a43 JP |
411 | { |
412 | int err; | |
413 | ||
cbe7128c | 414 | err = __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, mac_len); |
15255a43 JP |
415 | if (err) { |
416 | dev_kfree_skb_any(skb); | |
417 | return NULL; | |
418 | } | |
0b5c9db1 JP |
419 | return skb; |
420 | } | |
1da177e4 | 421 | |
cbe7128c TM |
422 | /** |
423 | * vlan_insert_tag - regular VLAN tag inserting | |
424 | * @skb: skbuff to tag | |
425 | * @vlan_proto: VLAN encapsulation protocol | |
426 | * @vlan_tci: VLAN TCI to insert | |
427 | * | |
428 | * Inserts the VLAN tag into @skb as part of the payload | |
429 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
430 | * | |
431 | * Following the skb_unshare() example, in case of error, the calling function | |
432 | * doesn't have to worry about freeing the original skb. | |
433 | * | |
434 | * Does not change skb->protocol so this function can be used during receive. | |
435 | */ | |
436 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, | |
437 | __be16 vlan_proto, u16 vlan_tci) | |
438 | { | |
439 | return vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN); | |
440 | } | |
441 | ||
0b5c9db1 | 442 | /** |
62749e2c | 443 | * vlan_insert_tag_set_proto - regular VLAN tag inserting |
0b5c9db1 | 444 | * @skb: skbuff to tag |
62749e2c | 445 | * @vlan_proto: VLAN encapsulation protocol |
0b5c9db1 JP |
446 | * @vlan_tci: VLAN TCI to insert |
447 | * | |
448 | * Inserts the VLAN tag into @skb as part of the payload | |
449 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
450 | * | |
451 | * Following the skb_unshare() example, in case of error, the calling function | |
452 | * doesn't have to worry about freeing the original skb. | |
453 | */ | |
62749e2c JP |
454 | static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb, |
455 | __be16 vlan_proto, | |
456 | u16 vlan_tci) | |
0b5c9db1 | 457 | { |
86a9bad3 | 458 | skb = vlan_insert_tag(skb, vlan_proto, vlan_tci); |
0b5c9db1 | 459 | if (skb) |
86a9bad3 | 460 | skb->protocol = vlan_proto; |
1da177e4 LT |
461 | return skb; |
462 | } | |
463 | ||
5968250c JP |
464 | /* |
465 | * __vlan_hwaccel_push_inside - pushes vlan tag to the payload | |
466 | * @skb: skbuff to tag | |
467 | * | |
468 | * Pushes the VLAN tag from @skb->vlan_tci inside to the payload. | |
469 | * | |
470 | * Following the skb_unshare() example, in case of error, the calling function | |
471 | * doesn't have to worry about freeing the original skb. | |
472 | */ | |
473 | static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb) | |
474 | { | |
475 | skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, | |
df8a39de | 476 | skb_vlan_tag_get(skb)); |
5968250c JP |
477 | if (likely(skb)) |
478 | skb->vlan_tci = 0; | |
479 | return skb; | |
480 | } | |
5968250c | 481 | |
1da177e4 LT |
482 | /** |
483 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
484 | * @skb: skbuff to tag | |
86a9bad3 | 485 | * @vlan_proto: VLAN encapsulation protocol |
9bb8582e | 486 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 487 | * |
6aa895b0 | 488 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 489 | */ |
b960a0ac JP |
490 | static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb, |
491 | __be16 vlan_proto, u16 vlan_tci) | |
1da177e4 | 492 | { |
86a9bad3 | 493 | skb->vlan_proto = vlan_proto; |
05423b24 | 494 | skb->vlan_tci = VLAN_TAG_PRESENT | vlan_tci; |
1da177e4 LT |
495 | } |
496 | ||
1da177e4 LT |
497 | /** |
498 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
499 | * @skb: skbuff to query | |
f4fb874c | 500 | * @vlan_tci: buffer to store value |
9bb8582e | 501 | * |
1da177e4 LT |
502 | * Returns error if the skb is not of VLAN type |
503 | */ | |
9bb8582e | 504 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
505 | { |
506 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
507 | ||
fe19c4f9 | 508 | if (!eth_type_vlan(veth->h_vlan_proto)) |
1da177e4 | 509 | return -EINVAL; |
1da177e4 | 510 | |
9bb8582e | 511 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
512 | return 0; |
513 | } | |
514 | ||
515 | /** | |
516 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
517 | * @skb: skbuff to query | |
f4fb874c | 518 | * @vlan_tci: buffer to store value |
9bb8582e | 519 | * |
6aa895b0 | 520 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 521 | */ |
18149935 | 522 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 523 | u16 *vlan_tci) |
1da177e4 | 524 | { |
df8a39de JP |
525 | if (skb_vlan_tag_present(skb)) { |
526 | *vlan_tci = skb_vlan_tag_get(skb); | |
1da177e4 LT |
527 | return 0; |
528 | } else { | |
9bb8582e | 529 | *vlan_tci = 0; |
1da177e4 LT |
530 | return -EINVAL; |
531 | } | |
532 | } | |
533 | ||
534 | #define HAVE_VLAN_GET_TAG | |
535 | ||
536 | /** | |
537 | * vlan_get_tag - get the VLAN ID from the skb | |
538 | * @skb: skbuff to query | |
f4fb874c | 539 | * @vlan_tci: buffer to store value |
9bb8582e | 540 | * |
1da177e4 LT |
541 | * Returns error if the skb is not VLAN tagged |
542 | */ | |
9bb8582e | 543 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 | 544 | { |
f646968f | 545 | if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) { |
9bb8582e | 546 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 547 | } else { |
9bb8582e | 548 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
549 | } |
550 | } | |
551 | ||
0a85df00 HZ |
552 | /** |
553 | * vlan_get_protocol - get protocol EtherType. | |
554 | * @skb: skbuff to query | |
d4bcef3f TM |
555 | * @type: first vlan protocol |
556 | * @depth: buffer to store length of eth and vlan tags in bytes | |
0a85df00 HZ |
557 | * |
558 | * Returns the EtherType of the packet, regardless of whether it is | |
559 | * vlan encapsulated (normal or hardware accelerated) or not. | |
560 | */ | |
d4bcef3f TM |
561 | static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type, |
562 | int *depth) | |
0a85df00 | 563 | { |
d4bcef3f TM |
564 | unsigned int vlan_depth = skb->mac_len; |
565 | ||
566 | /* if type is 802.1Q/AD then the header should already be | |
567 | * present at mac_len - VLAN_HLEN (if mac_len > 0), or at | |
568 | * ETH_HLEN otherwise | |
569 | */ | |
fe19c4f9 | 570 | if (eth_type_vlan(type)) { |
d4bcef3f TM |
571 | if (vlan_depth) { |
572 | if (WARN_ON(vlan_depth < VLAN_HLEN)) | |
573 | return 0; | |
574 | vlan_depth -= VLAN_HLEN; | |
575 | } else { | |
576 | vlan_depth = ETH_HLEN; | |
577 | } | |
578 | do { | |
579 | struct vlan_hdr *vh; | |
580 | ||
581 | if (unlikely(!pskb_may_pull(skb, | |
582 | vlan_depth + VLAN_HLEN))) | |
583 | return 0; | |
584 | ||
585 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); | |
586 | type = vh->h_vlan_encapsulated_proto; | |
587 | vlan_depth += VLAN_HLEN; | |
fe19c4f9 | 588 | } while (eth_type_vlan(type)); |
0a85df00 HZ |
589 | } |
590 | ||
d4bcef3f TM |
591 | if (depth) |
592 | *depth = vlan_depth; | |
593 | ||
594 | return type; | |
595 | } | |
596 | ||
597 | /** | |
598 | * vlan_get_protocol - get protocol EtherType. | |
599 | * @skb: skbuff to query | |
600 | * | |
601 | * Returns the EtherType of the packet, regardless of whether it is | |
602 | * vlan encapsulated (normal or hardware accelerated) or not. | |
603 | */ | |
604 | static inline __be16 vlan_get_protocol(struct sk_buff *skb) | |
605 | { | |
606 | return __vlan_get_protocol(skb, skb->protocol, NULL); | |
0a85df00 | 607 | } |
396cf943 PS |
608 | |
609 | static inline void vlan_set_encap_proto(struct sk_buff *skb, | |
610 | struct vlan_hdr *vhdr) | |
611 | { | |
612 | __be16 proto; | |
da8c8724 | 613 | unsigned short *rawp; |
396cf943 PS |
614 | |
615 | /* | |
616 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
617 | * three protocols care about. | |
618 | */ | |
619 | ||
620 | proto = vhdr->h_vlan_encapsulated_proto; | |
9545b22d | 621 | if (eth_proto_is_802_3(proto)) { |
396cf943 PS |
622 | skb->protocol = proto; |
623 | return; | |
624 | } | |
625 | ||
da8c8724 CW |
626 | rawp = (unsigned short *)(vhdr + 1); |
627 | if (*rawp == 0xFFFF) | |
396cf943 PS |
628 | /* |
629 | * This is a magic hack to spot IPX packets. Older Novell | |
630 | * breaks the protocol design and runs IPX over 802.3 without | |
631 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
632 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
633 | * but does for the rest. | |
634 | */ | |
635 | skb->protocol = htons(ETH_P_802_3); | |
636 | else | |
637 | /* | |
638 | * Real 802.2 LLC | |
639 | */ | |
640 | skb->protocol = htons(ETH_P_802_2); | |
641 | } | |
44a40855 | 642 | |
f5a7fb88 TM |
643 | /** |
644 | * skb_vlan_tagged - check if skb is vlan tagged. | |
645 | * @skb: skbuff to query | |
646 | * | |
647 | * Returns true if the skb is tagged, regardless of whether it is hardware | |
648 | * accelerated or not. | |
649 | */ | |
650 | static inline bool skb_vlan_tagged(const struct sk_buff *skb) | |
651 | { | |
652 | if (!skb_vlan_tag_present(skb) && | |
fe19c4f9 | 653 | likely(!eth_type_vlan(skb->protocol))) |
f5a7fb88 TM |
654 | return false; |
655 | ||
656 | return true; | |
657 | } | |
658 | ||
659 | /** | |
660 | * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers. | |
661 | * @skb: skbuff to query | |
662 | * | |
663 | * Returns true if the skb is tagged with multiple vlan headers, regardless | |
664 | * of whether it is hardware accelerated or not. | |
665 | */ | |
7ce23672 | 666 | static inline bool skb_vlan_tagged_multi(struct sk_buff *skb) |
f5a7fb88 TM |
667 | { |
668 | __be16 protocol = skb->protocol; | |
669 | ||
670 | if (!skb_vlan_tag_present(skb)) { | |
671 | struct vlan_ethhdr *veh; | |
672 | ||
fe19c4f9 | 673 | if (likely(!eth_type_vlan(protocol))) |
f5a7fb88 TM |
674 | return false; |
675 | ||
7ce23672 TM |
676 | if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN))) |
677 | return false; | |
678 | ||
f5a7fb88 TM |
679 | veh = (struct vlan_ethhdr *)skb->data; |
680 | protocol = veh->h_vlan_encapsulated_proto; | |
681 | } | |
682 | ||
fe19c4f9 | 683 | if (!eth_type_vlan(protocol)) |
f5a7fb88 TM |
684 | return false; |
685 | ||
686 | return true; | |
687 | } | |
688 | ||
8cb65d00 TM |
689 | /** |
690 | * vlan_features_check - drop unsafe features for skb with multiple tags. | |
691 | * @skb: skbuff to query | |
692 | * @features: features to be checked | |
693 | * | |
694 | * Returns features without unsafe ones if the skb has multiple tags. | |
695 | */ | |
7ce23672 | 696 | static inline netdev_features_t vlan_features_check(struct sk_buff *skb, |
8cb65d00 TM |
697 | netdev_features_t features) |
698 | { | |
35d2f80b VY |
699 | if (skb_vlan_tagged_multi(skb)) { |
700 | /* In the case of multi-tagged packets, use a direct mask | |
701 | * instead of using netdev_interesect_features(), to make | |
702 | * sure that only devices supporting NETIF_F_HW_CSUM will | |
703 | * have checksum offloading support. | |
704 | */ | |
705 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | | |
706 | NETIF_F_FRAGLIST | NETIF_F_HW_VLAN_CTAG_TX | | |
707 | NETIF_F_HW_VLAN_STAG_TX; | |
708 | } | |
8cb65d00 TM |
709 | |
710 | return features; | |
711 | } | |
712 | ||
66e5133f TM |
713 | /** |
714 | * compare_vlan_header - Compare two vlan headers | |
715 | * @h1: Pointer to vlan header | |
716 | * @h2: Pointer to vlan header | |
717 | * | |
718 | * Compare two vlan headers, returns 0 if equal. | |
719 | * | |
720 | * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. | |
721 | */ | |
722 | static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1, | |
723 | const struct vlan_hdr *h2) | |
724 | { | |
725 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
726 | return *(u32 *)h1 ^ *(u32 *)h2; | |
727 | #else | |
728 | return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) | | |
729 | ((__force u32)h1->h_vlan_encapsulated_proto ^ | |
730 | (__force u32)h2->h_vlan_encapsulated_proto); | |
731 | #endif | |
732 | } | |
1da177e4 | 733 | #endif /* !(_LINUX_IF_VLAN_H_) */ |