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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * VLAN An implementation of 802.1Q VLAN tagging. | |
4 | * | |
5 | * Authors: Ben Greear <greearb@candelatech.com> | |
1da177e4 | 6 | */ |
1da177e4 LT |
7 | #ifndef _LINUX_IF_VLAN_H_ |
8 | #define _LINUX_IF_VLAN_H_ | |
9 | ||
1da177e4 | 10 | #include <linux/netdevice.h> |
0610d11b | 11 | #include <linux/etherdevice.h> |
65ac6a5f | 12 | #include <linux/rtnetlink.h> |
187f1882 | 13 | #include <linux/bug.h> |
607ca46e | 14 | #include <uapi/linux/if_vlan.h> |
1da177e4 | 15 | |
a3f671b3 JP |
16 | #define VLAN_HLEN 4 /* The additional bytes required by VLAN |
17 | * (in addition to the Ethernet header) | |
1da177e4 | 18 | */ |
1da177e4 LT |
19 | #define VLAN_ETH_HLEN 18 /* Total octets in header. */ |
20 | #define VLAN_ETH_ZLEN 64 /* Min. octets in frame sans FCS */ | |
21 | ||
22 | /* | |
23 | * According to 802.3ac, the packet can be 4 bytes longer. --Klika Jan | |
24 | */ | |
25 | #define VLAN_ETH_DATA_LEN 1500 /* Max. octets in payload */ | |
26 | #define VLAN_ETH_FRAME_LEN 1518 /* Max. octets in frame sans FCS */ | |
27 | ||
740c15d0 PM |
28 | /* |
29 | * struct vlan_hdr - vlan header | |
30 | * @h_vlan_TCI: priority and VLAN ID | |
31 | * @h_vlan_encapsulated_proto: packet type ID or len | |
32 | */ | |
33 | struct vlan_hdr { | |
34 | __be16 h_vlan_TCI; | |
35 | __be16 h_vlan_encapsulated_proto; | |
36 | }; | |
37 | ||
38 | /** | |
39 | * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr) | |
40 | * @h_dest: destination ethernet address | |
41 | * @h_source: source ethernet address | |
a7bf5804 | 42 | * @h_vlan_proto: ethernet protocol |
740c15d0 PM |
43 | * @h_vlan_TCI: priority and VLAN ID |
44 | * @h_vlan_encapsulated_proto: packet type ID or len | |
45 | */ | |
1da177e4 | 46 | struct vlan_ethhdr { |
740c15d0 PM |
47 | unsigned char h_dest[ETH_ALEN]; |
48 | unsigned char h_source[ETH_ALEN]; | |
49 | __be16 h_vlan_proto; | |
50 | __be16 h_vlan_TCI; | |
51 | __be16 h_vlan_encapsulated_proto; | |
1da177e4 LT |
52 | }; |
53 | ||
54 | #include <linux/skbuff.h> | |
55 | ||
56 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | |
57 | { | |
98e399f8 | 58 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
1da177e4 LT |
59 | } |
60 | ||
05423b24 ED |
61 | #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */ |
62 | #define VLAN_PRIO_SHIFT 13 | |
a2e768b8 | 63 | #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */ |
05423b24 | 64 | #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */ |
b738127d | 65 | #define VLAN_N_VID 4096 |
1da177e4 LT |
66 | |
67 | /* found in socket.c */ | |
881d966b | 68 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 69 | |
b618aaa9 | 70 | static inline bool is_vlan_dev(const struct net_device *dev) |
6dcbbe25 NH |
71 | { |
72 | return dev->priv_flags & IFF_802_1Q_VLAN; | |
73 | } | |
74 | ||
0c4b2d37 MM |
75 | #define skb_vlan_tag_present(__skb) ((__skb)->vlan_present) |
76 | #define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci) | |
df8a39de | 77 | #define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK) |
a2e768b8 | 78 | #define skb_vlan_tag_get_cfi(__skb) (!!((__skb)->vlan_tci & VLAN_CFI_MASK)) |
9b319148 | 79 | #define skb_vlan_tag_get_prio(__skb) (((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT) |
1da177e4 | 80 | |
9daae9bd GP |
81 | static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev) |
82 | { | |
83 | ASSERT_RTNL(); | |
84 | return notifier_to_errno(call_netdevice_notifiers(NETDEV_CVLAN_FILTER_PUSH_INFO, dev)); | |
85 | } | |
86 | ||
87 | static inline void vlan_drop_rx_ctag_filter_info(struct net_device *dev) | |
88 | { | |
89 | ASSERT_RTNL(); | |
90 | call_netdevice_notifiers(NETDEV_CVLAN_FILTER_DROP_INFO, dev); | |
91 | } | |
92 | ||
93 | static inline int vlan_get_rx_stag_filter_info(struct net_device *dev) | |
94 | { | |
95 | ASSERT_RTNL(); | |
96 | return notifier_to_errno(call_netdevice_notifiers(NETDEV_SVLAN_FILTER_PUSH_INFO, dev)); | |
97 | } | |
98 | ||
99 | static inline void vlan_drop_rx_stag_filter_info(struct net_device *dev) | |
100 | { | |
101 | ASSERT_RTNL(); | |
102 | call_netdevice_notifiers(NETDEV_SVLAN_FILTER_DROP_INFO, dev); | |
103 | } | |
104 | ||
e267cb96 DM |
105 | /** |
106 | * struct vlan_pcpu_stats - VLAN percpu rx/tx stats | |
107 | * @rx_packets: number of received packets | |
108 | * @rx_bytes: number of received bytes | |
109 | * @rx_multicast: number of received multicast packets | |
110 | * @tx_packets: number of transmitted packets | |
111 | * @tx_bytes: number of transmitted bytes | |
112 | * @syncp: synchronization point for 64bit counters | |
113 | * @rx_errors: number of rx errors | |
114 | * @tx_dropped: number of tx drops | |
115 | */ | |
116 | struct vlan_pcpu_stats { | |
117 | u64 rx_packets; | |
118 | u64 rx_bytes; | |
119 | u64 rx_multicast; | |
120 | u64 tx_packets; | |
121 | u64 tx_bytes; | |
122 | struct u64_stats_sync syncp; | |
123 | u32 rx_errors; | |
124 | u32 tx_dropped; | |
125 | }; | |
126 | ||
1e85c9b6 HFS |
127 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
128 | ||
f06c7f9f | 129 | extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev, |
1e85c9b6 | 130 | __be16 vlan_proto, u16 vlan_id); |
960abf68 IK |
131 | extern int vlan_for_each(struct net_device *dev, |
132 | int (*action)(struct net_device *dev, int vid, | |
133 | void *arg), void *arg); | |
1e85c9b6 HFS |
134 | extern struct net_device *vlan_dev_real_dev(const struct net_device *dev); |
135 | extern u16 vlan_dev_vlan_id(const struct net_device *dev); | |
71e415e4 | 136 | extern __be16 vlan_dev_vlan_proto(const struct net_device *dev); |
1e85c9b6 HFS |
137 | |
138 | /** | |
139 | * struct vlan_priority_tci_mapping - vlan egress priority mappings | |
140 | * @priority: skb priority | |
141 | * @vlan_qos: vlan priority: (skb->priority << 13) & 0xE000 | |
142 | * @next: pointer to next struct | |
143 | */ | |
144 | struct vlan_priority_tci_mapping { | |
145 | u32 priority; | |
146 | u16 vlan_qos; | |
147 | struct vlan_priority_tci_mapping *next; | |
148 | }; | |
149 | ||
e267cb96 DM |
150 | struct proc_dir_entry; |
151 | struct netpoll; | |
152 | ||
153 | /** | |
154 | * struct vlan_dev_priv - VLAN private device data | |
155 | * @nr_ingress_mappings: number of ingress priority mappings | |
156 | * @ingress_priority_map: ingress priority mappings | |
157 | * @nr_egress_mappings: number of egress priority mappings | |
158 | * @egress_priority_map: hash of egress priority mappings | |
159 | * @vlan_proto: VLAN encapsulation protocol | |
160 | * @vlan_id: VLAN identifier | |
161 | * @flags: device flags | |
162 | * @real_dev: underlying netdevice | |
163 | * @real_dev_addr: address of underlying netdevice | |
164 | * @dent: proc dir entry | |
165 | * @vlan_pcpu_stats: ptr to percpu rx stats | |
166 | */ | |
167 | struct vlan_dev_priv { | |
168 | unsigned int nr_ingress_mappings; | |
169 | u32 ingress_priority_map[8]; | |
170 | unsigned int nr_egress_mappings; | |
171 | struct vlan_priority_tci_mapping *egress_priority_map[16]; | |
172 | ||
173 | __be16 vlan_proto; | |
174 | u16 vlan_id; | |
175 | u16 flags; | |
176 | ||
177 | struct net_device *real_dev; | |
178 | unsigned char real_dev_addr[ETH_ALEN]; | |
179 | ||
180 | struct proc_dir_entry *dent; | |
181 | struct vlan_pcpu_stats __percpu *vlan_pcpu_stats; | |
182 | #ifdef CONFIG_NET_POLL_CONTROLLER | |
183 | struct netpoll *netpoll; | |
184 | #endif | |
d38569ab | 185 | unsigned int nest_level; |
e267cb96 DM |
186 | }; |
187 | ||
188 | static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev) | |
189 | { | |
190 | return netdev_priv(dev); | |
191 | } | |
192 | ||
193 | static inline u16 | |
194 | vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio) | |
195 | { | |
196 | struct vlan_priority_tci_mapping *mp; | |
197 | ||
198 | smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */ | |
199 | ||
200 | mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)]; | |
201 | while (mp) { | |
202 | if (mp->priority == skprio) { | |
203 | return mp->vlan_qos; /* This should already be shifted | |
204 | * to mask correctly with the | |
205 | * VLAN's TCI */ | |
206 | } | |
207 | mp = mp->next; | |
208 | } | |
209 | return 0; | |
210 | } | |
211 | ||
48cc32d3 | 212 | extern bool vlan_do_receive(struct sk_buff **skb); |
9b22ea56 | 213 | |
80d5c368 PM |
214 | extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid); |
215 | extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid); | |
87002b03 | 216 | |
348a1443 JP |
217 | extern int vlan_vids_add_by_dev(struct net_device *dev, |
218 | const struct net_device *by_dev); | |
219 | extern void vlan_vids_del_by_dev(struct net_device *dev, | |
220 | const struct net_device *by_dev); | |
9b361c13 JP |
221 | |
222 | extern bool vlan_uses_dev(const struct net_device *dev); | |
e1618d46 VY |
223 | |
224 | static inline int vlan_get_encap_level(struct net_device *dev) | |
225 | { | |
226 | BUG_ON(!is_vlan_dev(dev)); | |
227 | return vlan_dev_priv(dev)->nest_level; | |
228 | } | |
7750f403 | 229 | #else |
cec9c133 | 230 | static inline struct net_device * |
f06c7f9f | 231 | __vlan_find_dev_deep_rcu(struct net_device *real_dev, |
9fae27b3 | 232 | __be16 vlan_proto, u16 vlan_id) |
cec9c133 JP |
233 | { |
234 | return NULL; | |
235 | } | |
236 | ||
960abf68 IK |
237 | static inline int |
238 | vlan_for_each(struct net_device *dev, | |
239 | int (*action)(struct net_device *dev, int vid, void *arg), | |
240 | void *arg) | |
241 | { | |
242 | return 0; | |
243 | } | |
244 | ||
22d1ba74 PM |
245 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
246 | { | |
247 | BUG(); | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
252 | { | |
253 | BUG(); | |
254 | return 0; | |
255 | } | |
256 | ||
71e415e4 | 257 | static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev) |
258 | { | |
259 | BUG(); | |
260 | return 0; | |
261 | } | |
262 | ||
d3243539 EP |
263 | static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev, |
264 | u32 skprio) | |
265 | { | |
266 | return 0; | |
267 | } | |
268 | ||
48cc32d3 | 269 | static inline bool vlan_do_receive(struct sk_buff **skb) |
9b22ea56 | 270 | { |
3701e513 | 271 | return false; |
9b22ea56 | 272 | } |
e1c096e2 | 273 | |
9fae27b3 | 274 | static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
87002b03 JP |
275 | { |
276 | return 0; | |
277 | } | |
278 | ||
9fae27b3 | 279 | static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
87002b03 JP |
280 | { |
281 | } | |
348a1443 JP |
282 | |
283 | static inline int vlan_vids_add_by_dev(struct net_device *dev, | |
284 | const struct net_device *by_dev) | |
285 | { | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static inline void vlan_vids_del_by_dev(struct net_device *dev, | |
290 | const struct net_device *by_dev) | |
291 | { | |
292 | } | |
9b361c13 JP |
293 | |
294 | static inline bool vlan_uses_dev(const struct net_device *dev) | |
295 | { | |
296 | return false; | |
297 | } | |
e1618d46 VY |
298 | static inline int vlan_get_encap_level(struct net_device *dev) |
299 | { | |
300 | BUG(); | |
301 | return 0; | |
302 | } | |
7750f403 | 303 | #endif |
1da177e4 | 304 | |
fe19c4f9 EG |
305 | /** |
306 | * eth_type_vlan - check for valid vlan ether type. | |
307 | * @ethertype: ether type to check | |
308 | * | |
309 | * Returns true if the ether type is a vlan ether type. | |
310 | */ | |
311 | static inline bool eth_type_vlan(__be16 ethertype) | |
312 | { | |
313 | switch (ethertype) { | |
314 | case htons(ETH_P_8021Q): | |
315 | case htons(ETH_P_8021AD): | |
316 | return true; | |
317 | default: | |
318 | return false; | |
319 | } | |
320 | } | |
321 | ||
86a9bad3 PM |
322 | static inline bool vlan_hw_offload_capable(netdev_features_t features, |
323 | __be16 proto) | |
324 | { | |
325 | if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX) | |
326 | return true; | |
8ad227ff PM |
327 | if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX) |
328 | return true; | |
86a9bad3 PM |
329 | return false; |
330 | } | |
331 | ||
1da177e4 | 332 | /** |
cbe7128c | 333 | * __vlan_insert_inner_tag - inner VLAN tag inserting |
1da177e4 | 334 | * @skb: skbuff to tag |
86a9bad3 | 335 | * @vlan_proto: VLAN encapsulation protocol |
9bb8582e | 336 | * @vlan_tci: VLAN TCI to insert |
cbe7128c | 337 | * @mac_len: MAC header length including outer vlan headers |
1da177e4 | 338 | * |
cbe7128c | 339 | * Inserts the VLAN tag into @skb as part of the payload at offset mac_len |
8051ac76 | 340 | * Returns error if skb_cow_head fails. |
0b5c9db1 JP |
341 | * |
342 | * Does not change skb->protocol so this function can be used during receive. | |
1da177e4 | 343 | */ |
cbe7128c TM |
344 | static inline int __vlan_insert_inner_tag(struct sk_buff *skb, |
345 | __be16 vlan_proto, u16 vlan_tci, | |
346 | unsigned int mac_len) | |
1da177e4 LT |
347 | { |
348 | struct vlan_ethhdr *veth; | |
349 | ||
15255a43 JP |
350 | if (skb_cow_head(skb, VLAN_HLEN) < 0) |
351 | return -ENOMEM; | |
352 | ||
cbe7128c | 353 | skb_push(skb, VLAN_HLEN); |
1da177e4 | 354 | |
cbe7128c | 355 | /* Move the mac header sans proto to the beginning of the new header. */ |
c769accd TM |
356 | if (likely(mac_len > ETH_TLEN)) |
357 | memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN); | |
e4dd6188 | 358 | skb->mac_header -= VLAN_HLEN; |
1da177e4 | 359 | |
cbe7128c TM |
360 | veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN); |
361 | ||
1da177e4 | 362 | /* first, the ethernet type */ |
c769accd TM |
363 | if (likely(mac_len >= ETH_TLEN)) { |
364 | /* h_vlan_encapsulated_proto should already be populated, and | |
365 | * skb->data has space for h_vlan_proto | |
366 | */ | |
367 | veth->h_vlan_proto = vlan_proto; | |
368 | } else { | |
369 | /* h_vlan_encapsulated_proto should not be populated, and | |
370 | * skb->data has no space for h_vlan_proto | |
371 | */ | |
372 | veth->h_vlan_encapsulated_proto = skb->protocol; | |
373 | } | |
1da177e4 | 374 | |
9bb8582e PM |
375 | /* now, the TCI */ |
376 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 377 | |
15255a43 JP |
378 | return 0; |
379 | } | |
380 | ||
381 | /** | |
cbe7128c | 382 | * __vlan_insert_tag - regular VLAN tag inserting |
15255a43 JP |
383 | * @skb: skbuff to tag |
384 | * @vlan_proto: VLAN encapsulation protocol | |
385 | * @vlan_tci: VLAN TCI to insert | |
386 | * | |
387 | * Inserts the VLAN tag into @skb as part of the payload | |
8051ac76 | 388 | * Returns error if skb_cow_head fails. |
cbe7128c TM |
389 | * |
390 | * Does not change skb->protocol so this function can be used during receive. | |
391 | */ | |
392 | static inline int __vlan_insert_tag(struct sk_buff *skb, | |
393 | __be16 vlan_proto, u16 vlan_tci) | |
394 | { | |
395 | return __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN); | |
396 | } | |
397 | ||
398 | /** | |
399 | * vlan_insert_inner_tag - inner VLAN tag inserting | |
400 | * @skb: skbuff to tag | |
401 | * @vlan_proto: VLAN encapsulation protocol | |
402 | * @vlan_tci: VLAN TCI to insert | |
403 | * @mac_len: MAC header length including outer vlan headers | |
404 | * | |
405 | * Inserts the VLAN tag into @skb as part of the payload at offset mac_len | |
15255a43 JP |
406 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
407 | * | |
408 | * Following the skb_unshare() example, in case of error, the calling function | |
409 | * doesn't have to worry about freeing the original skb. | |
410 | * | |
411 | * Does not change skb->protocol so this function can be used during receive. | |
412 | */ | |
cbe7128c TM |
413 | static inline struct sk_buff *vlan_insert_inner_tag(struct sk_buff *skb, |
414 | __be16 vlan_proto, | |
415 | u16 vlan_tci, | |
416 | unsigned int mac_len) | |
15255a43 JP |
417 | { |
418 | int err; | |
419 | ||
cbe7128c | 420 | err = __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, mac_len); |
15255a43 JP |
421 | if (err) { |
422 | dev_kfree_skb_any(skb); | |
423 | return NULL; | |
424 | } | |
0b5c9db1 JP |
425 | return skb; |
426 | } | |
1da177e4 | 427 | |
cbe7128c TM |
428 | /** |
429 | * vlan_insert_tag - regular VLAN tag inserting | |
430 | * @skb: skbuff to tag | |
431 | * @vlan_proto: VLAN encapsulation protocol | |
432 | * @vlan_tci: VLAN TCI to insert | |
433 | * | |
434 | * Inserts the VLAN tag into @skb as part of the payload | |
435 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
436 | * | |
437 | * Following the skb_unshare() example, in case of error, the calling function | |
438 | * doesn't have to worry about freeing the original skb. | |
439 | * | |
440 | * Does not change skb->protocol so this function can be used during receive. | |
441 | */ | |
442 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, | |
443 | __be16 vlan_proto, u16 vlan_tci) | |
444 | { | |
445 | return vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN); | |
446 | } | |
447 | ||
0b5c9db1 | 448 | /** |
62749e2c | 449 | * vlan_insert_tag_set_proto - regular VLAN tag inserting |
0b5c9db1 | 450 | * @skb: skbuff to tag |
62749e2c | 451 | * @vlan_proto: VLAN encapsulation protocol |
0b5c9db1 JP |
452 | * @vlan_tci: VLAN TCI to insert |
453 | * | |
454 | * Inserts the VLAN tag into @skb as part of the payload | |
455 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
456 | * | |
457 | * Following the skb_unshare() example, in case of error, the calling function | |
458 | * doesn't have to worry about freeing the original skb. | |
459 | */ | |
62749e2c JP |
460 | static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb, |
461 | __be16 vlan_proto, | |
462 | u16 vlan_tci) | |
0b5c9db1 | 463 | { |
86a9bad3 | 464 | skb = vlan_insert_tag(skb, vlan_proto, vlan_tci); |
0b5c9db1 | 465 | if (skb) |
86a9bad3 | 466 | skb->protocol = vlan_proto; |
1da177e4 LT |
467 | return skb; |
468 | } | |
469 | ||
c8accd5a MM |
470 | /** |
471 | * __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info | |
472 | * @skb: skbuff to clear | |
473 | * | |
474 | * Clears the VLAN information from @skb | |
475 | */ | |
476 | static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb) | |
477 | { | |
0c4b2d37 | 478 | skb->vlan_present = 0; |
c8accd5a MM |
479 | } |
480 | ||
e0a6b809 MM |
481 | /** |
482 | * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb | |
483 | * @dst: skbuff to copy to | |
484 | * @src: skbuff to copy from | |
485 | * | |
486 | * Copies VLAN information from @src to @dst (for branchless code) | |
487 | */ | |
488 | static inline void __vlan_hwaccel_copy_tag(struct sk_buff *dst, const struct sk_buff *src) | |
489 | { | |
0c4b2d37 | 490 | dst->vlan_present = src->vlan_present; |
e0a6b809 MM |
491 | dst->vlan_proto = src->vlan_proto; |
492 | dst->vlan_tci = src->vlan_tci; | |
493 | } | |
494 | ||
5968250c JP |
495 | /* |
496 | * __vlan_hwaccel_push_inside - pushes vlan tag to the payload | |
497 | * @skb: skbuff to tag | |
498 | * | |
499 | * Pushes the VLAN tag from @skb->vlan_tci inside to the payload. | |
500 | * | |
501 | * Following the skb_unshare() example, in case of error, the calling function | |
502 | * doesn't have to worry about freeing the original skb. | |
503 | */ | |
504 | static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb) | |
505 | { | |
506 | skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, | |
df8a39de | 507 | skb_vlan_tag_get(skb)); |
5968250c | 508 | if (likely(skb)) |
c8accd5a | 509 | __vlan_hwaccel_clear_tag(skb); |
5968250c JP |
510 | return skb; |
511 | } | |
5968250c | 512 | |
1da177e4 LT |
513 | /** |
514 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
515 | * @skb: skbuff to tag | |
86a9bad3 | 516 | * @vlan_proto: VLAN encapsulation protocol |
9bb8582e | 517 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 518 | * |
6aa895b0 | 519 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 520 | */ |
b960a0ac JP |
521 | static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb, |
522 | __be16 vlan_proto, u16 vlan_tci) | |
1da177e4 | 523 | { |
86a9bad3 | 524 | skb->vlan_proto = vlan_proto; |
0c4b2d37 MM |
525 | skb->vlan_tci = vlan_tci; |
526 | skb->vlan_present = 1; | |
1da177e4 LT |
527 | } |
528 | ||
1da177e4 LT |
529 | /** |
530 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
531 | * @skb: skbuff to query | |
f4fb874c | 532 | * @vlan_tci: buffer to store value |
9bb8582e | 533 | * |
1da177e4 LT |
534 | * Returns error if the skb is not of VLAN type |
535 | */ | |
9bb8582e | 536 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
537 | { |
538 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
539 | ||
fe19c4f9 | 540 | if (!eth_type_vlan(veth->h_vlan_proto)) |
1da177e4 | 541 | return -EINVAL; |
1da177e4 | 542 | |
9bb8582e | 543 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
544 | return 0; |
545 | } | |
546 | ||
547 | /** | |
548 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
549 | * @skb: skbuff to query | |
f4fb874c | 550 | * @vlan_tci: buffer to store value |
9bb8582e | 551 | * |
6aa895b0 | 552 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 553 | */ |
18149935 | 554 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 555 | u16 *vlan_tci) |
1da177e4 | 556 | { |
df8a39de JP |
557 | if (skb_vlan_tag_present(skb)) { |
558 | *vlan_tci = skb_vlan_tag_get(skb); | |
1da177e4 LT |
559 | return 0; |
560 | } else { | |
9bb8582e | 561 | *vlan_tci = 0; |
1da177e4 LT |
562 | return -EINVAL; |
563 | } | |
564 | } | |
565 | ||
1da177e4 LT |
566 | /** |
567 | * vlan_get_tag - get the VLAN ID from the skb | |
568 | * @skb: skbuff to query | |
f4fb874c | 569 | * @vlan_tci: buffer to store value |
9bb8582e | 570 | * |
1da177e4 LT |
571 | * Returns error if the skb is not VLAN tagged |
572 | */ | |
9bb8582e | 573 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 | 574 | { |
f646968f | 575 | if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) { |
9bb8582e | 576 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 577 | } else { |
9bb8582e | 578 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
579 | } |
580 | } | |
581 | ||
0a85df00 HZ |
582 | /** |
583 | * vlan_get_protocol - get protocol EtherType. | |
584 | * @skb: skbuff to query | |
d4bcef3f TM |
585 | * @type: first vlan protocol |
586 | * @depth: buffer to store length of eth and vlan tags in bytes | |
0a85df00 HZ |
587 | * |
588 | * Returns the EtherType of the packet, regardless of whether it is | |
589 | * vlan encapsulated (normal or hardware accelerated) or not. | |
590 | */ | |
d4bcef3f TM |
591 | static inline __be16 __vlan_get_protocol(struct sk_buff *skb, __be16 type, |
592 | int *depth) | |
0a85df00 | 593 | { |
d4bcef3f TM |
594 | unsigned int vlan_depth = skb->mac_len; |
595 | ||
596 | /* if type is 802.1Q/AD then the header should already be | |
597 | * present at mac_len - VLAN_HLEN (if mac_len > 0), or at | |
598 | * ETH_HLEN otherwise | |
599 | */ | |
fe19c4f9 | 600 | if (eth_type_vlan(type)) { |
d4bcef3f TM |
601 | if (vlan_depth) { |
602 | if (WARN_ON(vlan_depth < VLAN_HLEN)) | |
603 | return 0; | |
604 | vlan_depth -= VLAN_HLEN; | |
605 | } else { | |
606 | vlan_depth = ETH_HLEN; | |
607 | } | |
608 | do { | |
609 | struct vlan_hdr *vh; | |
610 | ||
611 | if (unlikely(!pskb_may_pull(skb, | |
612 | vlan_depth + VLAN_HLEN))) | |
613 | return 0; | |
614 | ||
615 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); | |
616 | type = vh->h_vlan_encapsulated_proto; | |
617 | vlan_depth += VLAN_HLEN; | |
fe19c4f9 | 618 | } while (eth_type_vlan(type)); |
0a85df00 HZ |
619 | } |
620 | ||
d4bcef3f TM |
621 | if (depth) |
622 | *depth = vlan_depth; | |
623 | ||
624 | return type; | |
625 | } | |
626 | ||
627 | /** | |
628 | * vlan_get_protocol - get protocol EtherType. | |
629 | * @skb: skbuff to query | |
630 | * | |
631 | * Returns the EtherType of the packet, regardless of whether it is | |
632 | * vlan encapsulated (normal or hardware accelerated) or not. | |
633 | */ | |
634 | static inline __be16 vlan_get_protocol(struct sk_buff *skb) | |
635 | { | |
636 | return __vlan_get_protocol(skb, skb->protocol, NULL); | |
0a85df00 | 637 | } |
396cf943 PS |
638 | |
639 | static inline void vlan_set_encap_proto(struct sk_buff *skb, | |
640 | struct vlan_hdr *vhdr) | |
641 | { | |
642 | __be16 proto; | |
da8c8724 | 643 | unsigned short *rawp; |
396cf943 PS |
644 | |
645 | /* | |
646 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
647 | * three protocols care about. | |
648 | */ | |
649 | ||
650 | proto = vhdr->h_vlan_encapsulated_proto; | |
9545b22d | 651 | if (eth_proto_is_802_3(proto)) { |
396cf943 PS |
652 | skb->protocol = proto; |
653 | return; | |
654 | } | |
655 | ||
da8c8724 CW |
656 | rawp = (unsigned short *)(vhdr + 1); |
657 | if (*rawp == 0xFFFF) | |
396cf943 PS |
658 | /* |
659 | * This is a magic hack to spot IPX packets. Older Novell | |
660 | * breaks the protocol design and runs IPX over 802.3 without | |
661 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
662 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
663 | * but does for the rest. | |
664 | */ | |
665 | skb->protocol = htons(ETH_P_802_3); | |
666 | else | |
667 | /* | |
668 | * Real 802.2 LLC | |
669 | */ | |
670 | skb->protocol = htons(ETH_P_802_2); | |
671 | } | |
44a40855 | 672 | |
f5a7fb88 TM |
673 | /** |
674 | * skb_vlan_tagged - check if skb is vlan tagged. | |
675 | * @skb: skbuff to query | |
676 | * | |
677 | * Returns true if the skb is tagged, regardless of whether it is hardware | |
678 | * accelerated or not. | |
679 | */ | |
680 | static inline bool skb_vlan_tagged(const struct sk_buff *skb) | |
681 | { | |
682 | if (!skb_vlan_tag_present(skb) && | |
fe19c4f9 | 683 | likely(!eth_type_vlan(skb->protocol))) |
f5a7fb88 TM |
684 | return false; |
685 | ||
686 | return true; | |
687 | } | |
688 | ||
689 | /** | |
690 | * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers. | |
691 | * @skb: skbuff to query | |
692 | * | |
693 | * Returns true if the skb is tagged with multiple vlan headers, regardless | |
694 | * of whether it is hardware accelerated or not. | |
695 | */ | |
7ce23672 | 696 | static inline bool skb_vlan_tagged_multi(struct sk_buff *skb) |
f5a7fb88 TM |
697 | { |
698 | __be16 protocol = skb->protocol; | |
699 | ||
700 | if (!skb_vlan_tag_present(skb)) { | |
701 | struct vlan_ethhdr *veh; | |
702 | ||
fe19c4f9 | 703 | if (likely(!eth_type_vlan(protocol))) |
f5a7fb88 TM |
704 | return false; |
705 | ||
7ce23672 TM |
706 | if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN))) |
707 | return false; | |
708 | ||
f5a7fb88 TM |
709 | veh = (struct vlan_ethhdr *)skb->data; |
710 | protocol = veh->h_vlan_encapsulated_proto; | |
711 | } | |
712 | ||
fe19c4f9 | 713 | if (!eth_type_vlan(protocol)) |
f5a7fb88 TM |
714 | return false; |
715 | ||
716 | return true; | |
717 | } | |
718 | ||
8cb65d00 TM |
719 | /** |
720 | * vlan_features_check - drop unsafe features for skb with multiple tags. | |
721 | * @skb: skbuff to query | |
722 | * @features: features to be checked | |
723 | * | |
724 | * Returns features without unsafe ones if the skb has multiple tags. | |
725 | */ | |
7ce23672 | 726 | static inline netdev_features_t vlan_features_check(struct sk_buff *skb, |
8cb65d00 TM |
727 | netdev_features_t features) |
728 | { | |
35d2f80b VY |
729 | if (skb_vlan_tagged_multi(skb)) { |
730 | /* In the case of multi-tagged packets, use a direct mask | |
731 | * instead of using netdev_interesect_features(), to make | |
732 | * sure that only devices supporting NETIF_F_HW_CSUM will | |
733 | * have checksum offloading support. | |
734 | */ | |
735 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | | |
736 | NETIF_F_FRAGLIST | NETIF_F_HW_VLAN_CTAG_TX | | |
737 | NETIF_F_HW_VLAN_STAG_TX; | |
738 | } | |
8cb65d00 TM |
739 | |
740 | return features; | |
741 | } | |
742 | ||
66e5133f TM |
743 | /** |
744 | * compare_vlan_header - Compare two vlan headers | |
745 | * @h1: Pointer to vlan header | |
746 | * @h2: Pointer to vlan header | |
747 | * | |
748 | * Compare two vlan headers, returns 0 if equal. | |
749 | * | |
750 | * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. | |
751 | */ | |
752 | static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1, | |
753 | const struct vlan_hdr *h2) | |
754 | { | |
755 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
756 | return *(u32 *)h1 ^ *(u32 *)h2; | |
757 | #else | |
758 | return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) | | |
759 | ((__force u32)h1->h_vlan_encapsulated_proto ^ | |
760 | (__force u32)h2->h_vlan_encapsulated_proto); | |
761 | #endif | |
762 | } | |
1da177e4 | 763 | #endif /* !(_LINUX_IF_VLAN_H_) */ |