This source file includes following definitions.
- vlan_do_receive
- __vlan_find_dev_deep_rcu
- vlan_dev_real_dev
- vlan_dev_vlan_id
- vlan_dev_vlan_proto
- vlan_group_free
- vlan_info_free
- vlan_info_rcu_free
- vlan_info_alloc
- vlan_hw_filter_capable
- vlan_vid_info_get
- vlan_vid_info_alloc
- vlan_add_rx_filter_info
- vlan_kill_rx_filter_info
- vlan_for_each
- vlan_filter_push_vids
- vlan_filter_drop_vids
- __vlan_vid_add
- vlan_vid_add
- __vlan_vid_del
- vlan_vid_del
- vlan_vids_add_by_dev
- vlan_vids_del_by_dev
- vlan_uses_dev
- vlan_gro_receive
- vlan_gro_complete
- vlan_offload_init
1
2 #include <linux/skbuff.h>
3 #include <linux/netdevice.h>
4 #include <linux/if_vlan.h>
5 #include <linux/netpoll.h>
6 #include <linux/export.h>
7 #include "vlan.h"
8
9 bool vlan_do_receive(struct sk_buff **skbp)
10 {
11 struct sk_buff *skb = *skbp;
12 __be16 vlan_proto = skb->vlan_proto;
13 u16 vlan_id = skb_vlan_tag_get_id(skb);
14 struct net_device *vlan_dev;
15 struct vlan_pcpu_stats *rx_stats;
16
17 vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
18 if (!vlan_dev)
19 return false;
20
21 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
22 if (unlikely(!skb))
23 return false;
24
25 if (unlikely(!(vlan_dev->flags & IFF_UP))) {
26 kfree_skb(skb);
27 *skbp = NULL;
28 return false;
29 }
30
31 skb->dev = vlan_dev;
32 if (unlikely(skb->pkt_type == PACKET_OTHERHOST)) {
33
34
35
36 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
37 skb->pkt_type = PACKET_HOST;
38 }
39
40 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR) &&
41 !netif_is_macvlan_port(vlan_dev) &&
42 !netif_is_bridge_port(vlan_dev)) {
43 unsigned int offset = skb->data - skb_mac_header(skb);
44
45
46
47
48
49
50 skb_push(skb, offset);
51 skb = *skbp = vlan_insert_inner_tag(skb, skb->vlan_proto,
52 skb->vlan_tci, skb->mac_len);
53 if (!skb)
54 return false;
55 skb_pull(skb, offset + VLAN_HLEN);
56 skb_reset_mac_len(skb);
57 }
58
59 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
60 __vlan_hwaccel_clear_tag(skb);
61
62 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
63
64 u64_stats_update_begin(&rx_stats->syncp);
65 rx_stats->rx_packets++;
66 rx_stats->rx_bytes += skb->len;
67 if (skb->pkt_type == PACKET_MULTICAST)
68 rx_stats->rx_multicast++;
69 u64_stats_update_end(&rx_stats->syncp);
70
71 return true;
72 }
73
74
75 struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev,
76 __be16 vlan_proto, u16 vlan_id)
77 {
78 struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
79
80 if (vlan_info) {
81 return vlan_group_get_device(&vlan_info->grp,
82 vlan_proto, vlan_id);
83 } else {
84
85
86
87
88
89 struct net_device *upper_dev;
90
91 upper_dev = netdev_master_upper_dev_get_rcu(dev);
92 if (upper_dev)
93 return __vlan_find_dev_deep_rcu(upper_dev,
94 vlan_proto, vlan_id);
95 }
96
97 return NULL;
98 }
99 EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
100
101 struct net_device *vlan_dev_real_dev(const struct net_device *dev)
102 {
103 struct net_device *ret = vlan_dev_priv(dev)->real_dev;
104
105 while (is_vlan_dev(ret))
106 ret = vlan_dev_priv(ret)->real_dev;
107
108 return ret;
109 }
110 EXPORT_SYMBOL(vlan_dev_real_dev);
111
112 u16 vlan_dev_vlan_id(const struct net_device *dev)
113 {
114 return vlan_dev_priv(dev)->vlan_id;
115 }
116 EXPORT_SYMBOL(vlan_dev_vlan_id);
117
118 __be16 vlan_dev_vlan_proto(const struct net_device *dev)
119 {
120 return vlan_dev_priv(dev)->vlan_proto;
121 }
122 EXPORT_SYMBOL(vlan_dev_vlan_proto);
123
124
125
126
127
128 static void vlan_group_free(struct vlan_group *grp)
129 {
130 int i, j;
131
132 for (i = 0; i < VLAN_PROTO_NUM; i++)
133 for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
134 kfree(grp->vlan_devices_arrays[i][j]);
135 }
136
137 static void vlan_info_free(struct vlan_info *vlan_info)
138 {
139 vlan_group_free(&vlan_info->grp);
140 kfree(vlan_info);
141 }
142
143 static void vlan_info_rcu_free(struct rcu_head *rcu)
144 {
145 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
146 }
147
148 static struct vlan_info *vlan_info_alloc(struct net_device *dev)
149 {
150 struct vlan_info *vlan_info;
151
152 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
153 if (!vlan_info)
154 return NULL;
155
156 vlan_info->real_dev = dev;
157 INIT_LIST_HEAD(&vlan_info->vid_list);
158 return vlan_info;
159 }
160
161 struct vlan_vid_info {
162 struct list_head list;
163 __be16 proto;
164 u16 vid;
165 int refcount;
166 };
167
168 static bool vlan_hw_filter_capable(const struct net_device *dev, __be16 proto)
169 {
170 if (proto == htons(ETH_P_8021Q) &&
171 dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
172 return true;
173 if (proto == htons(ETH_P_8021AD) &&
174 dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
175 return true;
176 return false;
177 }
178
179 static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
180 __be16 proto, u16 vid)
181 {
182 struct vlan_vid_info *vid_info;
183
184 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
185 if (vid_info->proto == proto && vid_info->vid == vid)
186 return vid_info;
187 }
188 return NULL;
189 }
190
191 static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
192 {
193 struct vlan_vid_info *vid_info;
194
195 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
196 if (!vid_info)
197 return NULL;
198 vid_info->proto = proto;
199 vid_info->vid = vid;
200
201 return vid_info;
202 }
203
204 static int vlan_add_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
205 {
206 if (!vlan_hw_filter_capable(dev, proto))
207 return 0;
208
209 if (netif_device_present(dev))
210 return dev->netdev_ops->ndo_vlan_rx_add_vid(dev, proto, vid);
211 else
212 return -ENODEV;
213 }
214
215 static int vlan_kill_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
216 {
217 if (!vlan_hw_filter_capable(dev, proto))
218 return 0;
219
220 if (netif_device_present(dev))
221 return dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
222 else
223 return -ENODEV;
224 }
225
226 int vlan_for_each(struct net_device *dev,
227 int (*action)(struct net_device *dev, int vid, void *arg),
228 void *arg)
229 {
230 struct vlan_vid_info *vid_info;
231 struct vlan_info *vlan_info;
232 struct net_device *vdev;
233 int ret;
234
235 ASSERT_RTNL();
236
237 vlan_info = rtnl_dereference(dev->vlan_info);
238 if (!vlan_info)
239 return 0;
240
241 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
242 vdev = vlan_group_get_device(&vlan_info->grp, vid_info->proto,
243 vid_info->vid);
244 ret = action(vdev, vid_info->vid, arg);
245 if (ret)
246 return ret;
247 }
248
249 return 0;
250 }
251 EXPORT_SYMBOL(vlan_for_each);
252
253 int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto)
254 {
255 struct net_device *real_dev = vlan_info->real_dev;
256 struct vlan_vid_info *vlan_vid_info;
257 int err;
258
259 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) {
260 if (vlan_vid_info->proto == proto) {
261 err = vlan_add_rx_filter_info(real_dev, proto,
262 vlan_vid_info->vid);
263 if (err)
264 goto unwind;
265 }
266 }
267
268 return 0;
269
270 unwind:
271 list_for_each_entry_continue_reverse(vlan_vid_info,
272 &vlan_info->vid_list, list) {
273 if (vlan_vid_info->proto == proto)
274 vlan_kill_rx_filter_info(real_dev, proto,
275 vlan_vid_info->vid);
276 }
277
278 return err;
279 }
280 EXPORT_SYMBOL(vlan_filter_push_vids);
281
282 void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto)
283 {
284 struct vlan_vid_info *vlan_vid_info;
285
286 list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list)
287 if (vlan_vid_info->proto == proto)
288 vlan_kill_rx_filter_info(vlan_info->real_dev,
289 vlan_vid_info->proto,
290 vlan_vid_info->vid);
291 }
292 EXPORT_SYMBOL(vlan_filter_drop_vids);
293
294 static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
295 struct vlan_vid_info **pvid_info)
296 {
297 struct net_device *dev = vlan_info->real_dev;
298 struct vlan_vid_info *vid_info;
299 int err;
300
301 vid_info = vlan_vid_info_alloc(proto, vid);
302 if (!vid_info)
303 return -ENOMEM;
304
305 err = vlan_add_rx_filter_info(dev, proto, vid);
306 if (err) {
307 kfree(vid_info);
308 return err;
309 }
310
311 list_add(&vid_info->list, &vlan_info->vid_list);
312 vlan_info->nr_vids++;
313 *pvid_info = vid_info;
314 return 0;
315 }
316
317 int vlan_vid_add(struct net_device *dev, __be16 proto, u16 vid)
318 {
319 struct vlan_info *vlan_info;
320 struct vlan_vid_info *vid_info;
321 bool vlan_info_created = false;
322 int err;
323
324 ASSERT_RTNL();
325
326 vlan_info = rtnl_dereference(dev->vlan_info);
327 if (!vlan_info) {
328 vlan_info = vlan_info_alloc(dev);
329 if (!vlan_info)
330 return -ENOMEM;
331 vlan_info_created = true;
332 }
333 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
334 if (!vid_info) {
335 err = __vlan_vid_add(vlan_info, proto, vid, &vid_info);
336 if (err)
337 goto out_free_vlan_info;
338 }
339 vid_info->refcount++;
340
341 if (vlan_info_created)
342 rcu_assign_pointer(dev->vlan_info, vlan_info);
343
344 return 0;
345
346 out_free_vlan_info:
347 if (vlan_info_created)
348 kfree(vlan_info);
349 return err;
350 }
351 EXPORT_SYMBOL(vlan_vid_add);
352
353 static void __vlan_vid_del(struct vlan_info *vlan_info,
354 struct vlan_vid_info *vid_info)
355 {
356 struct net_device *dev = vlan_info->real_dev;
357 __be16 proto = vid_info->proto;
358 u16 vid = vid_info->vid;
359 int err;
360
361 err = vlan_kill_rx_filter_info(dev, proto, vid);
362 if (err)
363 pr_warn("failed to kill vid %04x/%d for device %s\n",
364 proto, vid, dev->name);
365
366 list_del(&vid_info->list);
367 kfree(vid_info);
368 vlan_info->nr_vids--;
369 }
370
371 void vlan_vid_del(struct net_device *dev, __be16 proto, u16 vid)
372 {
373 struct vlan_info *vlan_info;
374 struct vlan_vid_info *vid_info;
375
376 ASSERT_RTNL();
377
378 vlan_info = rtnl_dereference(dev->vlan_info);
379 if (!vlan_info)
380 return;
381
382 vid_info = vlan_vid_info_get(vlan_info, proto, vid);
383 if (!vid_info)
384 return;
385 vid_info->refcount--;
386 if (vid_info->refcount == 0) {
387 __vlan_vid_del(vlan_info, vid_info);
388 if (vlan_info->nr_vids == 0) {
389 RCU_INIT_POINTER(dev->vlan_info, NULL);
390 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
391 }
392 }
393 }
394 EXPORT_SYMBOL(vlan_vid_del);
395
396 int vlan_vids_add_by_dev(struct net_device *dev,
397 const struct net_device *by_dev)
398 {
399 struct vlan_vid_info *vid_info;
400 struct vlan_info *vlan_info;
401 int err;
402
403 ASSERT_RTNL();
404
405 vlan_info = rtnl_dereference(by_dev->vlan_info);
406 if (!vlan_info)
407 return 0;
408
409 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
410 err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
411 if (err)
412 goto unwind;
413 }
414 return 0;
415
416 unwind:
417 list_for_each_entry_continue_reverse(vid_info,
418 &vlan_info->vid_list,
419 list) {
420 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
421 }
422
423 return err;
424 }
425 EXPORT_SYMBOL(vlan_vids_add_by_dev);
426
427 void vlan_vids_del_by_dev(struct net_device *dev,
428 const struct net_device *by_dev)
429 {
430 struct vlan_vid_info *vid_info;
431 struct vlan_info *vlan_info;
432
433 ASSERT_RTNL();
434
435 vlan_info = rtnl_dereference(by_dev->vlan_info);
436 if (!vlan_info)
437 return;
438
439 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
440 vlan_vid_del(dev, vid_info->proto, vid_info->vid);
441 }
442 EXPORT_SYMBOL(vlan_vids_del_by_dev);
443
444 bool vlan_uses_dev(const struct net_device *dev)
445 {
446 struct vlan_info *vlan_info;
447
448 ASSERT_RTNL();
449
450 vlan_info = rtnl_dereference(dev->vlan_info);
451 if (!vlan_info)
452 return false;
453 return vlan_info->grp.nr_vlan_devs ? true : false;
454 }
455 EXPORT_SYMBOL(vlan_uses_dev);
456
457 static struct sk_buff *vlan_gro_receive(struct list_head *head,
458 struct sk_buff *skb)
459 {
460 const struct packet_offload *ptype;
461 unsigned int hlen, off_vlan;
462 struct sk_buff *pp = NULL;
463 struct vlan_hdr *vhdr;
464 struct sk_buff *p;
465 __be16 type;
466 int flush = 1;
467
468 off_vlan = skb_gro_offset(skb);
469 hlen = off_vlan + sizeof(*vhdr);
470 vhdr = skb_gro_header_fast(skb, off_vlan);
471 if (skb_gro_header_hard(skb, hlen)) {
472 vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
473 if (unlikely(!vhdr))
474 goto out;
475 }
476
477 type = vhdr->h_vlan_encapsulated_proto;
478
479 rcu_read_lock();
480 ptype = gro_find_receive_by_type(type);
481 if (!ptype)
482 goto out_unlock;
483
484 flush = 0;
485
486 list_for_each_entry(p, head, list) {
487 struct vlan_hdr *vhdr2;
488
489 if (!NAPI_GRO_CB(p)->same_flow)
490 continue;
491
492 vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
493 if (compare_vlan_header(vhdr, vhdr2))
494 NAPI_GRO_CB(p)->same_flow = 0;
495 }
496
497 skb_gro_pull(skb, sizeof(*vhdr));
498 skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
499 pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb);
500
501 out_unlock:
502 rcu_read_unlock();
503 out:
504 skb_gro_flush_final(skb, pp, flush);
505
506 return pp;
507 }
508
509 static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
510 {
511 struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
512 __be16 type = vhdr->h_vlan_encapsulated_proto;
513 struct packet_offload *ptype;
514 int err = -ENOENT;
515
516 rcu_read_lock();
517 ptype = gro_find_complete_by_type(type);
518 if (ptype)
519 err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
520
521 rcu_read_unlock();
522 return err;
523 }
524
525 static struct packet_offload vlan_packet_offloads[] __read_mostly = {
526 {
527 .type = cpu_to_be16(ETH_P_8021Q),
528 .priority = 10,
529 .callbacks = {
530 .gro_receive = vlan_gro_receive,
531 .gro_complete = vlan_gro_complete,
532 },
533 },
534 {
535 .type = cpu_to_be16(ETH_P_8021AD),
536 .priority = 10,
537 .callbacks = {
538 .gro_receive = vlan_gro_receive,
539 .gro_complete = vlan_gro_complete,
540 },
541 },
542 };
543
544 static int __init vlan_offload_init(void)
545 {
546 unsigned int i;
547
548 for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
549 dev_add_offload(&vlan_packet_offloads[i]);
550
551 return 0;
552 }
553
554 fs_initcall(vlan_offload_init);