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Commit | Line | Data |
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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 | ||
469acedd THJ |
28 | #define VLAN_MAX_DEPTH 8 /* Max. number of nested VLAN tags parsed */ |
29 | ||
740c15d0 PM |
30 | /* |
31 | * struct vlan_hdr - vlan header | |
32 | * @h_vlan_TCI: priority and VLAN ID | |
33 | * @h_vlan_encapsulated_proto: packet type ID or len | |
34 | */ | |
35 | struct vlan_hdr { | |
36 | __be16 h_vlan_TCI; | |
37 | __be16 h_vlan_encapsulated_proto; | |
38 | }; | |
39 | ||
40 | /** | |
41 | * struct vlan_ethhdr - vlan ethernet header (ethhdr + vlan_hdr) | |
42 | * @h_dest: destination ethernet address | |
43 | * @h_source: source ethernet address | |
a7bf5804 | 44 | * @h_vlan_proto: ethernet protocol |
740c15d0 PM |
45 | * @h_vlan_TCI: priority and VLAN ID |
46 | * @h_vlan_encapsulated_proto: packet type ID or len | |
47 | */ | |
1da177e4 | 48 | struct vlan_ethhdr { |
740c15d0 PM |
49 | unsigned char h_dest[ETH_ALEN]; |
50 | unsigned char h_source[ETH_ALEN]; | |
51 | __be16 h_vlan_proto; | |
52 | __be16 h_vlan_TCI; | |
53 | __be16 h_vlan_encapsulated_proto; | |
1da177e4 LT |
54 | }; |
55 | ||
56 | #include <linux/skbuff.h> | |
57 | ||
58 | static inline struct vlan_ethhdr *vlan_eth_hdr(const struct sk_buff *skb) | |
59 | { | |
98e399f8 | 60 | return (struct vlan_ethhdr *)skb_mac_header(skb); |
1da177e4 LT |
61 | } |
62 | ||
05423b24 ED |
63 | #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */ |
64 | #define VLAN_PRIO_SHIFT 13 | |
a2e768b8 | 65 | #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator / Drop Eligible Indicator */ |
05423b24 | 66 | #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */ |
b738127d | 67 | #define VLAN_N_VID 4096 |
1da177e4 LT |
68 | |
69 | /* found in socket.c */ | |
881d966b | 70 | extern void vlan_ioctl_set(int (*hook)(struct net *, void __user *)); |
1da177e4 | 71 | |
b618aaa9 | 72 | static inline bool is_vlan_dev(const struct net_device *dev) |
6dcbbe25 NH |
73 | { |
74 | return dev->priv_flags & IFF_802_1Q_VLAN; | |
75 | } | |
76 | ||
0c4b2d37 MM |
77 | #define skb_vlan_tag_present(__skb) ((__skb)->vlan_present) |
78 | #define skb_vlan_tag_get(__skb) ((__skb)->vlan_tci) | |
df8a39de | 79 | #define skb_vlan_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK) |
a2e768b8 | 80 | #define skb_vlan_tag_get_cfi(__skb) (!!((__skb)->vlan_tci & VLAN_CFI_MASK)) |
9b319148 | 81 | #define skb_vlan_tag_get_prio(__skb) (((__skb)->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT) |
1da177e4 | 82 | |
9daae9bd GP |
83 | static inline int vlan_get_rx_ctag_filter_info(struct net_device *dev) |
84 | { | |
85 | ASSERT_RTNL(); | |
86 | return notifier_to_errno(call_netdevice_notifiers(NETDEV_CVLAN_FILTER_PUSH_INFO, dev)); | |
87 | } | |
88 | ||
89 | static inline void vlan_drop_rx_ctag_filter_info(struct net_device *dev) | |
90 | { | |
91 | ASSERT_RTNL(); | |
92 | call_netdevice_notifiers(NETDEV_CVLAN_FILTER_DROP_INFO, dev); | |
93 | } | |
94 | ||
95 | static inline int vlan_get_rx_stag_filter_info(struct net_device *dev) | |
96 | { | |
97 | ASSERT_RTNL(); | |
98 | return notifier_to_errno(call_netdevice_notifiers(NETDEV_SVLAN_FILTER_PUSH_INFO, dev)); | |
99 | } | |
100 | ||
101 | static inline void vlan_drop_rx_stag_filter_info(struct net_device *dev) | |
102 | { | |
103 | ASSERT_RTNL(); | |
104 | call_netdevice_notifiers(NETDEV_SVLAN_FILTER_DROP_INFO, dev); | |
105 | } | |
106 | ||
e267cb96 DM |
107 | /** |
108 | * struct vlan_pcpu_stats - VLAN percpu rx/tx stats | |
109 | * @rx_packets: number of received packets | |
110 | * @rx_bytes: number of received bytes | |
111 | * @rx_multicast: number of received multicast packets | |
112 | * @tx_packets: number of transmitted packets | |
113 | * @tx_bytes: number of transmitted bytes | |
114 | * @syncp: synchronization point for 64bit counters | |
115 | * @rx_errors: number of rx errors | |
116 | * @tx_dropped: number of tx drops | |
117 | */ | |
118 | struct vlan_pcpu_stats { | |
119 | u64 rx_packets; | |
120 | u64 rx_bytes; | |
121 | u64 rx_multicast; | |
122 | u64 tx_packets; | |
123 | u64 tx_bytes; | |
124 | struct u64_stats_sync syncp; | |
125 | u32 rx_errors; | |
126 | u32 tx_dropped; | |
127 | }; | |
128 | ||
1e85c9b6 HFS |
129 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
130 | ||
f06c7f9f | 131 | extern struct net_device *__vlan_find_dev_deep_rcu(struct net_device *real_dev, |
1e85c9b6 | 132 | __be16 vlan_proto, u16 vlan_id); |
960abf68 IK |
133 | extern int vlan_for_each(struct net_device *dev, |
134 | int (*action)(struct net_device *dev, int vid, | |
135 | void *arg), void *arg); | |
1e85c9b6 HFS |
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 | |
187 | }; | |
188 | ||
189 | static inline struct vlan_dev_priv *vlan_dev_priv(const struct net_device *dev) | |
190 | { | |
191 | return netdev_priv(dev); | |
192 | } | |
193 | ||
194 | static inline u16 | |
195 | vlan_dev_get_egress_qos_mask(struct net_device *dev, u32 skprio) | |
196 | { | |
197 | struct vlan_priority_tci_mapping *mp; | |
198 | ||
199 | smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */ | |
200 | ||
201 | mp = vlan_dev_priv(dev)->egress_priority_map[(skprio & 0xF)]; | |
202 | while (mp) { | |
203 | if (mp->priority == skprio) { | |
204 | return mp->vlan_qos; /* This should already be shifted | |
205 | * to mask correctly with the | |
206 | * VLAN's TCI */ | |
207 | } | |
208 | mp = mp->next; | |
209 | } | |
210 | return 0; | |
211 | } | |
212 | ||
48cc32d3 | 213 | extern bool vlan_do_receive(struct sk_buff **skb); |
9b22ea56 | 214 | |
80d5c368 PM |
215 | extern int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid); |
216 | extern void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid); | |
87002b03 | 217 | |
348a1443 JP |
218 | extern int vlan_vids_add_by_dev(struct net_device *dev, |
219 | const struct net_device *by_dev); | |
220 | extern void vlan_vids_del_by_dev(struct net_device *dev, | |
221 | const struct net_device *by_dev); | |
9b361c13 JP |
222 | |
223 | extern bool vlan_uses_dev(const struct net_device *dev); | |
e1618d46 | 224 | |
7750f403 | 225 | #else |
cec9c133 | 226 | static inline struct net_device * |
f06c7f9f | 227 | __vlan_find_dev_deep_rcu(struct net_device *real_dev, |
9fae27b3 | 228 | __be16 vlan_proto, u16 vlan_id) |
cec9c133 JP |
229 | { |
230 | return NULL; | |
231 | } | |
232 | ||
960abf68 IK |
233 | static inline int |
234 | vlan_for_each(struct net_device *dev, | |
235 | int (*action)(struct net_device *dev, int vid, void *arg), | |
236 | void *arg) | |
237 | { | |
238 | return 0; | |
239 | } | |
240 | ||
22d1ba74 PM |
241 | static inline struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
242 | { | |
243 | BUG(); | |
244 | return NULL; | |
245 | } | |
246 | ||
247 | static inline u16 vlan_dev_vlan_id(const struct net_device *dev) | |
248 | { | |
249 | BUG(); | |
250 | return 0; | |
251 | } | |
252 | ||
71e415e4 | 253 | static inline __be16 vlan_dev_vlan_proto(const struct net_device *dev) |
254 | { | |
255 | BUG(); | |
256 | return 0; | |
257 | } | |
258 | ||
d3243539 EP |
259 | static inline u16 vlan_dev_get_egress_qos_mask(struct net_device *dev, |
260 | u32 skprio) | |
261 | { | |
262 | return 0; | |
263 | } | |
264 | ||
48cc32d3 | 265 | static inline bool vlan_do_receive(struct sk_buff **skb) |
9b22ea56 | 266 | { |
3701e513 | 267 | return false; |
9b22ea56 | 268 | } |
e1c096e2 | 269 | |
9fae27b3 | 270 | static inline int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid) |
87002b03 JP |
271 | { |
272 | return 0; | |
273 | } | |
274 | ||
9fae27b3 | 275 | static inline void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid) |
87002b03 JP |
276 | { |
277 | } | |
348a1443 JP |
278 | |
279 | static inline int vlan_vids_add_by_dev(struct net_device *dev, | |
280 | const struct net_device *by_dev) | |
281 | { | |
282 | return 0; | |
283 | } | |
284 | ||
285 | static inline void vlan_vids_del_by_dev(struct net_device *dev, | |
286 | const struct net_device *by_dev) | |
287 | { | |
288 | } | |
9b361c13 JP |
289 | |
290 | static inline bool vlan_uses_dev(const struct net_device *dev) | |
291 | { | |
292 | return false; | |
293 | } | |
7750f403 | 294 | #endif |
1da177e4 | 295 | |
fe19c4f9 EG |
296 | /** |
297 | * eth_type_vlan - check for valid vlan ether type. | |
298 | * @ethertype: ether type to check | |
299 | * | |
300 | * Returns true if the ether type is a vlan ether type. | |
301 | */ | |
302 | static inline bool eth_type_vlan(__be16 ethertype) | |
303 | { | |
304 | switch (ethertype) { | |
305 | case htons(ETH_P_8021Q): | |
306 | case htons(ETH_P_8021AD): | |
307 | return true; | |
308 | default: | |
309 | return false; | |
310 | } | |
311 | } | |
312 | ||
86a9bad3 PM |
313 | static inline bool vlan_hw_offload_capable(netdev_features_t features, |
314 | __be16 proto) | |
315 | { | |
316 | if (proto == htons(ETH_P_8021Q) && features & NETIF_F_HW_VLAN_CTAG_TX) | |
317 | return true; | |
8ad227ff PM |
318 | if (proto == htons(ETH_P_8021AD) && features & NETIF_F_HW_VLAN_STAG_TX) |
319 | return true; | |
86a9bad3 PM |
320 | return false; |
321 | } | |
322 | ||
1da177e4 | 323 | /** |
cbe7128c | 324 | * __vlan_insert_inner_tag - inner VLAN tag inserting |
1da177e4 | 325 | * @skb: skbuff to tag |
86a9bad3 | 326 | * @vlan_proto: VLAN encapsulation protocol |
9bb8582e | 327 | * @vlan_tci: VLAN TCI to insert |
cbe7128c | 328 | * @mac_len: MAC header length including outer vlan headers |
1da177e4 | 329 | * |
cbe7128c | 330 | * Inserts the VLAN tag into @skb as part of the payload at offset mac_len |
8051ac76 | 331 | * Returns error if skb_cow_head fails. |
0b5c9db1 JP |
332 | * |
333 | * Does not change skb->protocol so this function can be used during receive. | |
1da177e4 | 334 | */ |
cbe7128c TM |
335 | static inline int __vlan_insert_inner_tag(struct sk_buff *skb, |
336 | __be16 vlan_proto, u16 vlan_tci, | |
337 | unsigned int mac_len) | |
1da177e4 LT |
338 | { |
339 | struct vlan_ethhdr *veth; | |
340 | ||
15255a43 JP |
341 | if (skb_cow_head(skb, VLAN_HLEN) < 0) |
342 | return -ENOMEM; | |
343 | ||
cbe7128c | 344 | skb_push(skb, VLAN_HLEN); |
1da177e4 | 345 | |
cbe7128c | 346 | /* Move the mac header sans proto to the beginning of the new header. */ |
c769accd TM |
347 | if (likely(mac_len > ETH_TLEN)) |
348 | memmove(skb->data, skb->data + VLAN_HLEN, mac_len - ETH_TLEN); | |
e4dd6188 | 349 | skb->mac_header -= VLAN_HLEN; |
1da177e4 | 350 | |
cbe7128c TM |
351 | veth = (struct vlan_ethhdr *)(skb->data + mac_len - ETH_HLEN); |
352 | ||
1da177e4 | 353 | /* first, the ethernet type */ |
c769accd TM |
354 | if (likely(mac_len >= ETH_TLEN)) { |
355 | /* h_vlan_encapsulated_proto should already be populated, and | |
356 | * skb->data has space for h_vlan_proto | |
357 | */ | |
358 | veth->h_vlan_proto = vlan_proto; | |
359 | } else { | |
360 | /* h_vlan_encapsulated_proto should not be populated, and | |
361 | * skb->data has no space for h_vlan_proto | |
362 | */ | |
363 | veth->h_vlan_encapsulated_proto = skb->protocol; | |
364 | } | |
1da177e4 | 365 | |
9bb8582e PM |
366 | /* now, the TCI */ |
367 | veth->h_vlan_TCI = htons(vlan_tci); | |
1da177e4 | 368 | |
15255a43 JP |
369 | return 0; |
370 | } | |
371 | ||
372 | /** | |
cbe7128c | 373 | * __vlan_insert_tag - regular VLAN tag inserting |
15255a43 JP |
374 | * @skb: skbuff to tag |
375 | * @vlan_proto: VLAN encapsulation protocol | |
376 | * @vlan_tci: VLAN TCI to insert | |
377 | * | |
378 | * Inserts the VLAN tag into @skb as part of the payload | |
8051ac76 | 379 | * Returns error if skb_cow_head fails. |
cbe7128c TM |
380 | * |
381 | * Does not change skb->protocol so this function can be used during receive. | |
382 | */ | |
383 | static inline int __vlan_insert_tag(struct sk_buff *skb, | |
384 | __be16 vlan_proto, u16 vlan_tci) | |
385 | { | |
386 | return __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN); | |
387 | } | |
388 | ||
389 | /** | |
390 | * vlan_insert_inner_tag - inner VLAN tag inserting | |
391 | * @skb: skbuff to tag | |
392 | * @vlan_proto: VLAN encapsulation protocol | |
393 | * @vlan_tci: VLAN TCI to insert | |
394 | * @mac_len: MAC header length including outer vlan headers | |
395 | * | |
396 | * Inserts the VLAN tag into @skb as part of the payload at offset mac_len | |
15255a43 JP |
397 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. |
398 | * | |
399 | * Following the skb_unshare() example, in case of error, the calling function | |
400 | * doesn't have to worry about freeing the original skb. | |
401 | * | |
402 | * Does not change skb->protocol so this function can be used during receive. | |
403 | */ | |
cbe7128c TM |
404 | static inline struct sk_buff *vlan_insert_inner_tag(struct sk_buff *skb, |
405 | __be16 vlan_proto, | |
406 | u16 vlan_tci, | |
407 | unsigned int mac_len) | |
15255a43 JP |
408 | { |
409 | int err; | |
410 | ||
cbe7128c | 411 | err = __vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, mac_len); |
15255a43 JP |
412 | if (err) { |
413 | dev_kfree_skb_any(skb); | |
414 | return NULL; | |
415 | } | |
0b5c9db1 JP |
416 | return skb; |
417 | } | |
1da177e4 | 418 | |
cbe7128c TM |
419 | /** |
420 | * vlan_insert_tag - regular VLAN tag inserting | |
421 | * @skb: skbuff to tag | |
422 | * @vlan_proto: VLAN encapsulation protocol | |
423 | * @vlan_tci: VLAN TCI to insert | |
424 | * | |
425 | * Inserts the VLAN tag into @skb as part of the payload | |
426 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
427 | * | |
428 | * Following the skb_unshare() example, in case of error, the calling function | |
429 | * doesn't have to worry about freeing the original skb. | |
430 | * | |
431 | * Does not change skb->protocol so this function can be used during receive. | |
432 | */ | |
433 | static inline struct sk_buff *vlan_insert_tag(struct sk_buff *skb, | |
434 | __be16 vlan_proto, u16 vlan_tci) | |
435 | { | |
436 | return vlan_insert_inner_tag(skb, vlan_proto, vlan_tci, ETH_HLEN); | |
437 | } | |
438 | ||
0b5c9db1 | 439 | /** |
62749e2c | 440 | * vlan_insert_tag_set_proto - regular VLAN tag inserting |
0b5c9db1 | 441 | * @skb: skbuff to tag |
62749e2c | 442 | * @vlan_proto: VLAN encapsulation protocol |
0b5c9db1 JP |
443 | * @vlan_tci: VLAN TCI to insert |
444 | * | |
445 | * Inserts the VLAN tag into @skb as part of the payload | |
446 | * Returns a VLAN tagged skb. If a new skb is created, @skb is freed. | |
447 | * | |
448 | * Following the skb_unshare() example, in case of error, the calling function | |
449 | * doesn't have to worry about freeing the original skb. | |
450 | */ | |
62749e2c JP |
451 | static inline struct sk_buff *vlan_insert_tag_set_proto(struct sk_buff *skb, |
452 | __be16 vlan_proto, | |
453 | u16 vlan_tci) | |
0b5c9db1 | 454 | { |
86a9bad3 | 455 | skb = vlan_insert_tag(skb, vlan_proto, vlan_tci); |
0b5c9db1 | 456 | if (skb) |
86a9bad3 | 457 | skb->protocol = vlan_proto; |
1da177e4 LT |
458 | return skb; |
459 | } | |
460 | ||
c8accd5a MM |
461 | /** |
462 | * __vlan_hwaccel_clear_tag - clear hardware accelerated VLAN info | |
463 | * @skb: skbuff to clear | |
464 | * | |
465 | * Clears the VLAN information from @skb | |
466 | */ | |
467 | static inline void __vlan_hwaccel_clear_tag(struct sk_buff *skb) | |
468 | { | |
0c4b2d37 | 469 | skb->vlan_present = 0; |
c8accd5a MM |
470 | } |
471 | ||
e0a6b809 MM |
472 | /** |
473 | * __vlan_hwaccel_copy_tag - copy hardware accelerated VLAN info from another skb | |
474 | * @dst: skbuff to copy to | |
475 | * @src: skbuff to copy from | |
476 | * | |
477 | * Copies VLAN information from @src to @dst (for branchless code) | |
478 | */ | |
479 | static inline void __vlan_hwaccel_copy_tag(struct sk_buff *dst, const struct sk_buff *src) | |
480 | { | |
0c4b2d37 | 481 | dst->vlan_present = src->vlan_present; |
e0a6b809 MM |
482 | dst->vlan_proto = src->vlan_proto; |
483 | dst->vlan_tci = src->vlan_tci; | |
484 | } | |
485 | ||
5968250c JP |
486 | /* |
487 | * __vlan_hwaccel_push_inside - pushes vlan tag to the payload | |
488 | * @skb: skbuff to tag | |
489 | * | |
490 | * Pushes the VLAN tag from @skb->vlan_tci inside to the payload. | |
491 | * | |
492 | * Following the skb_unshare() example, in case of error, the calling function | |
493 | * doesn't have to worry about freeing the original skb. | |
494 | */ | |
495 | static inline struct sk_buff *__vlan_hwaccel_push_inside(struct sk_buff *skb) | |
496 | { | |
497 | skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, | |
df8a39de | 498 | skb_vlan_tag_get(skb)); |
5968250c | 499 | if (likely(skb)) |
c8accd5a | 500 | __vlan_hwaccel_clear_tag(skb); |
5968250c JP |
501 | return skb; |
502 | } | |
5968250c | 503 | |
1da177e4 LT |
504 | /** |
505 | * __vlan_hwaccel_put_tag - hardware accelerated VLAN inserting | |
506 | * @skb: skbuff to tag | |
86a9bad3 | 507 | * @vlan_proto: VLAN encapsulation protocol |
9bb8582e | 508 | * @vlan_tci: VLAN TCI to insert |
1da177e4 | 509 | * |
6aa895b0 | 510 | * Puts the VLAN TCI in @skb->vlan_tci and lets the device do the rest |
1da177e4 | 511 | */ |
b960a0ac JP |
512 | static inline void __vlan_hwaccel_put_tag(struct sk_buff *skb, |
513 | __be16 vlan_proto, u16 vlan_tci) | |
1da177e4 | 514 | { |
86a9bad3 | 515 | skb->vlan_proto = vlan_proto; |
0c4b2d37 MM |
516 | skb->vlan_tci = vlan_tci; |
517 | skb->vlan_present = 1; | |
1da177e4 LT |
518 | } |
519 | ||
1da177e4 LT |
520 | /** |
521 | * __vlan_get_tag - get the VLAN ID that is part of the payload | |
522 | * @skb: skbuff to query | |
f4fb874c | 523 | * @vlan_tci: buffer to store value |
9bb8582e | 524 | * |
1da177e4 LT |
525 | * Returns error if the skb is not of VLAN type |
526 | */ | |
9bb8582e | 527 | static inline int __vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 LT |
528 | { |
529 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)skb->data; | |
530 | ||
fe19c4f9 | 531 | if (!eth_type_vlan(veth->h_vlan_proto)) |
1da177e4 | 532 | return -EINVAL; |
1da177e4 | 533 | |
9bb8582e | 534 | *vlan_tci = ntohs(veth->h_vlan_TCI); |
1da177e4 LT |
535 | return 0; |
536 | } | |
537 | ||
538 | /** | |
539 | * __vlan_hwaccel_get_tag - get the VLAN ID that is in @skb->cb[] | |
540 | * @skb: skbuff to query | |
f4fb874c | 541 | * @vlan_tci: buffer to store value |
9bb8582e | 542 | * |
6aa895b0 | 543 | * Returns error if @skb->vlan_tci is not set correctly |
1da177e4 | 544 | */ |
18149935 | 545 | static inline int __vlan_hwaccel_get_tag(const struct sk_buff *skb, |
9bb8582e | 546 | u16 *vlan_tci) |
1da177e4 | 547 | { |
df8a39de JP |
548 | if (skb_vlan_tag_present(skb)) { |
549 | *vlan_tci = skb_vlan_tag_get(skb); | |
1da177e4 LT |
550 | return 0; |
551 | } else { | |
9bb8582e | 552 | *vlan_tci = 0; |
1da177e4 LT |
553 | return -EINVAL; |
554 | } | |
555 | } | |
556 | ||
1da177e4 LT |
557 | /** |
558 | * vlan_get_tag - get the VLAN ID from the skb | |
559 | * @skb: skbuff to query | |
f4fb874c | 560 | * @vlan_tci: buffer to store value |
9bb8582e | 561 | * |
1da177e4 LT |
562 | * Returns error if the skb is not VLAN tagged |
563 | */ | |
9bb8582e | 564 | static inline int vlan_get_tag(const struct sk_buff *skb, u16 *vlan_tci) |
1da177e4 | 565 | { |
f646968f | 566 | if (skb->dev->features & NETIF_F_HW_VLAN_CTAG_TX) { |
9bb8582e | 567 | return __vlan_hwaccel_get_tag(skb, vlan_tci); |
1da177e4 | 568 | } else { |
9bb8582e | 569 | return __vlan_get_tag(skb, vlan_tci); |
1da177e4 LT |
570 | } |
571 | } | |
572 | ||
0a85df00 HZ |
573 | /** |
574 | * vlan_get_protocol - get protocol EtherType. | |
575 | * @skb: skbuff to query | |
d4bcef3f TM |
576 | * @type: first vlan protocol |
577 | * @depth: buffer to store length of eth and vlan tags in bytes | |
0a85df00 HZ |
578 | * |
579 | * Returns the EtherType of the packet, regardless of whether it is | |
580 | * vlan encapsulated (normal or hardware accelerated) or not. | |
581 | */ | |
469acedd | 582 | static inline __be16 __vlan_get_protocol(const struct sk_buff *skb, __be16 type, |
d4bcef3f | 583 | int *depth) |
0a85df00 | 584 | { |
469acedd | 585 | unsigned int vlan_depth = skb->mac_len, parse_depth = VLAN_MAX_DEPTH; |
d4bcef3f TM |
586 | |
587 | /* if type is 802.1Q/AD then the header should already be | |
588 | * present at mac_len - VLAN_HLEN (if mac_len > 0), or at | |
589 | * ETH_HLEN otherwise | |
590 | */ | |
fe19c4f9 | 591 | if (eth_type_vlan(type)) { |
d4bcef3f TM |
592 | if (vlan_depth) { |
593 | if (WARN_ON(vlan_depth < VLAN_HLEN)) | |
594 | return 0; | |
595 | vlan_depth -= VLAN_HLEN; | |
596 | } else { | |
597 | vlan_depth = ETH_HLEN; | |
598 | } | |
599 | do { | |
469acedd | 600 | struct vlan_hdr vhdr, *vh; |
d4bcef3f | 601 | |
469acedd THJ |
602 | vh = skb_header_pointer(skb, vlan_depth, sizeof(vhdr), &vhdr); |
603 | if (unlikely(!vh || !--parse_depth)) | |
d4bcef3f TM |
604 | return 0; |
605 | ||
d4bcef3f TM |
606 | type = vh->h_vlan_encapsulated_proto; |
607 | vlan_depth += VLAN_HLEN; | |
fe19c4f9 | 608 | } while (eth_type_vlan(type)); |
0a85df00 HZ |
609 | } |
610 | ||
d4bcef3f TM |
611 | if (depth) |
612 | *depth = vlan_depth; | |
613 | ||
614 | return type; | |
615 | } | |
616 | ||
617 | /** | |
618 | * vlan_get_protocol - get protocol EtherType. | |
619 | * @skb: skbuff to query | |
620 | * | |
621 | * Returns the EtherType of the packet, regardless of whether it is | |
622 | * vlan encapsulated (normal or hardware accelerated) or not. | |
623 | */ | |
469acedd | 624 | static inline __be16 vlan_get_protocol(const struct sk_buff *skb) |
d4bcef3f TM |
625 | { |
626 | return __vlan_get_protocol(skb, skb->protocol, NULL); | |
0a85df00 | 627 | } |
396cf943 | 628 | |
469acedd THJ |
629 | /* A getter for the SKB protocol field which will handle VLAN tags consistently |
630 | * whether VLAN acceleration is enabled or not. | |
631 | */ | |
632 | static inline __be16 skb_protocol(const struct sk_buff *skb, bool skip_vlan) | |
633 | { | |
634 | if (!skip_vlan) | |
635 | /* VLAN acceleration strips the VLAN header from the skb and | |
636 | * moves it to skb->vlan_proto | |
637 | */ | |
638 | return skb_vlan_tag_present(skb) ? skb->vlan_proto : skb->protocol; | |
639 | ||
640 | return vlan_get_protocol(skb); | |
641 | } | |
642 | ||
396cf943 PS |
643 | static inline void vlan_set_encap_proto(struct sk_buff *skb, |
644 | struct vlan_hdr *vhdr) | |
645 | { | |
646 | __be16 proto; | |
da8c8724 | 647 | unsigned short *rawp; |
396cf943 PS |
648 | |
649 | /* | |
650 | * Was a VLAN packet, grab the encapsulated protocol, which the layer | |
651 | * three protocols care about. | |
652 | */ | |
653 | ||
654 | proto = vhdr->h_vlan_encapsulated_proto; | |
9545b22d | 655 | if (eth_proto_is_802_3(proto)) { |
396cf943 PS |
656 | skb->protocol = proto; |
657 | return; | |
658 | } | |
659 | ||
da8c8724 CW |
660 | rawp = (unsigned short *)(vhdr + 1); |
661 | if (*rawp == 0xFFFF) | |
396cf943 PS |
662 | /* |
663 | * This is a magic hack to spot IPX packets. Older Novell | |
664 | * breaks the protocol design and runs IPX over 802.3 without | |
665 | * an 802.2 LLC layer. We look for FFFF which isn't a used | |
666 | * 802.2 SSAP/DSAP. This won't work for fault tolerant netware | |
667 | * but does for the rest. | |
668 | */ | |
669 | skb->protocol = htons(ETH_P_802_3); | |
670 | else | |
671 | /* | |
672 | * Real 802.2 LLC | |
673 | */ | |
674 | skb->protocol = htons(ETH_P_802_2); | |
675 | } | |
44a40855 | 676 | |
f5a7fb88 TM |
677 | /** |
678 | * skb_vlan_tagged - check if skb is vlan tagged. | |
679 | * @skb: skbuff to query | |
680 | * | |
681 | * Returns true if the skb is tagged, regardless of whether it is hardware | |
682 | * accelerated or not. | |
683 | */ | |
684 | static inline bool skb_vlan_tagged(const struct sk_buff *skb) | |
685 | { | |
686 | if (!skb_vlan_tag_present(skb) && | |
fe19c4f9 | 687 | likely(!eth_type_vlan(skb->protocol))) |
f5a7fb88 TM |
688 | return false; |
689 | ||
690 | return true; | |
691 | } | |
692 | ||
693 | /** | |
694 | * skb_vlan_tagged_multi - check if skb is vlan tagged with multiple headers. | |
695 | * @skb: skbuff to query | |
696 | * | |
697 | * Returns true if the skb is tagged with multiple vlan headers, regardless | |
698 | * of whether it is hardware accelerated or not. | |
699 | */ | |
7ce23672 | 700 | static inline bool skb_vlan_tagged_multi(struct sk_buff *skb) |
f5a7fb88 TM |
701 | { |
702 | __be16 protocol = skb->protocol; | |
703 | ||
704 | if (!skb_vlan_tag_present(skb)) { | |
705 | struct vlan_ethhdr *veh; | |
706 | ||
fe19c4f9 | 707 | if (likely(!eth_type_vlan(protocol))) |
f5a7fb88 TM |
708 | return false; |
709 | ||
7ce23672 TM |
710 | if (unlikely(!pskb_may_pull(skb, VLAN_ETH_HLEN))) |
711 | return false; | |
712 | ||
f5a7fb88 TM |
713 | veh = (struct vlan_ethhdr *)skb->data; |
714 | protocol = veh->h_vlan_encapsulated_proto; | |
715 | } | |
716 | ||
fe19c4f9 | 717 | if (!eth_type_vlan(protocol)) |
f5a7fb88 TM |
718 | return false; |
719 | ||
720 | return true; | |
721 | } | |
722 | ||
8cb65d00 TM |
723 | /** |
724 | * vlan_features_check - drop unsafe features for skb with multiple tags. | |
725 | * @skb: skbuff to query | |
726 | * @features: features to be checked | |
727 | * | |
728 | * Returns features without unsafe ones if the skb has multiple tags. | |
729 | */ | |
7ce23672 | 730 | static inline netdev_features_t vlan_features_check(struct sk_buff *skb, |
8cb65d00 TM |
731 | netdev_features_t features) |
732 | { | |
35d2f80b VY |
733 | if (skb_vlan_tagged_multi(skb)) { |
734 | /* In the case of multi-tagged packets, use a direct mask | |
735 | * instead of using netdev_interesect_features(), to make | |
736 | * sure that only devices supporting NETIF_F_HW_CSUM will | |
737 | * have checksum offloading support. | |
738 | */ | |
739 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | | |
740 | NETIF_F_FRAGLIST | NETIF_F_HW_VLAN_CTAG_TX | | |
741 | NETIF_F_HW_VLAN_STAG_TX; | |
742 | } | |
8cb65d00 TM |
743 | |
744 | return features; | |
745 | } | |
746 | ||
66e5133f TM |
747 | /** |
748 | * compare_vlan_header - Compare two vlan headers | |
749 | * @h1: Pointer to vlan header | |
750 | * @h2: Pointer to vlan header | |
751 | * | |
752 | * Compare two vlan headers, returns 0 if equal. | |
753 | * | |
754 | * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. | |
755 | */ | |
756 | static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1, | |
757 | const struct vlan_hdr *h2) | |
758 | { | |
759 | #if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) | |
760 | return *(u32 *)h1 ^ *(u32 *)h2; | |
761 | #else | |
762 | return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) | | |
763 | ((__force u32)h1->h_vlan_encapsulated_proto ^ | |
764 | (__force u32)h2->h_vlan_encapsulated_proto); | |
765 | #endif | |
766 | } | |
1da177e4 | 767 | #endif /* !(_LINUX_IF_VLAN_H_) */ |