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1// SPDX-License-Identifier: GPL-2.0
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
9bool 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 /* Our lower layer thinks this is not local, let's make sure.
34 * This allows the VLAN to have a different MAC than the
35 * underlying device, and still route correctly. */
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 * vlan_insert_tag expect skb->data pointing to mac header.
47 * So change skb->data before calling it and change back to
48 * original position later
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/* Must be invoked with rcu_read_lock. */
75struct 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 * Lower devices of master uppers (bonding, team) do not have
86 * grp assigned to themselves. Grp is assigned to upper device
87 * instead.
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}
99EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
100
101struct 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}
110EXPORT_SYMBOL(vlan_dev_real_dev);
111
112u16 vlan_dev_vlan_id(const struct net_device *dev)
113{
114 return vlan_dev_priv(dev)->vlan_id;
115}
116EXPORT_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}
122EXPORT_SYMBOL(vlan_dev_vlan_proto);
123
124/*
125 * vlan info and vid list
126 */
127
128static 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
137static void vlan_info_free(struct vlan_info *vlan_info)
138{
139 vlan_group_free(&vlan_info->grp);
140 kfree(vlan_info);
141}
142
143static void vlan_info_rcu_free(struct rcu_head *rcu)
144{
145 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
146}
147
148static 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
161struct vlan_vid_info {
162 struct list_head list;
163 __be16 proto;
164 u16 vid;
165 int refcount;
166};
167
168static 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
179static 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
191static 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
204static 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
215static 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
226int 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}
251EXPORT_SYMBOL(vlan_for_each);
252
253int 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
270unwind:
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}
280EXPORT_SYMBOL(vlan_filter_push_vids);
281
282void 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}
292EXPORT_SYMBOL(vlan_filter_drop_vids);
293
294static 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
317int 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
346out_free_vlan_info:
347 if (vlan_info_created)
348 kfree(vlan_info);
349 return err;
350}
351EXPORT_SYMBOL(vlan_vid_add);
352
353static 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
371void 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}
394EXPORT_SYMBOL(vlan_vid_del);
395
396int 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
416unwind:
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}
425EXPORT_SYMBOL(vlan_vids_add_by_dev);
426
427void 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}
442EXPORT_SYMBOL(vlan_vids_del_by_dev);
443
444bool 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}
455EXPORT_SYMBOL(vlan_uses_dev);
456
457static 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
501out_unlock:
502 rcu_read_unlock();
503out:
504 skb_gro_flush_final(skb, pp, flush);
505
506 return pp;
507}
508
509static 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
525static 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
544static 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
554fs_initcall(vlan_offload_init);
1#include <linux/skbuff.h>
2#include <linux/netdevice.h>
3#include <linux/if_vlan.h>
4#include <linux/netpoll.h>
5#include <linux/export.h>
6#include "vlan.h"
7
8bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
9{
10 struct sk_buff *skb = *skbp;
11 u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
12 struct net_device *vlan_dev;
13 struct vlan_pcpu_stats *rx_stats;
14
15 vlan_dev = vlan_find_dev(skb->dev, vlan_id);
16 if (!vlan_dev) {
17 /* Only the last call to vlan_do_receive() should change
18 * pkt_type to PACKET_OTHERHOST
19 */
20 if (vlan_id && last_handler)
21 skb->pkt_type = PACKET_OTHERHOST;
22 return false;
23 }
24
25 skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
26 if (unlikely(!skb))
27 return false;
28
29 skb->dev = vlan_dev;
30 if (skb->pkt_type == PACKET_OTHERHOST) {
31 /* Our lower layer thinks this is not local, let's make sure.
32 * This allows the VLAN to have a different MAC than the
33 * underlying device, and still route correctly. */
34 if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr))
35 skb->pkt_type = PACKET_HOST;
36 }
37
38 if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
39 unsigned int offset = skb->data - skb_mac_header(skb);
40
41 /*
42 * vlan_insert_tag expect skb->data pointing to mac header.
43 * So change skb->data before calling it and change back to
44 * original position later
45 */
46 skb_push(skb, offset);
47 skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
48 if (!skb)
49 return false;
50 skb_pull(skb, offset + VLAN_HLEN);
51 skb_reset_mac_len(skb);
52 }
53
54 skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
55 skb->vlan_tci = 0;
56
57 rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
58
59 u64_stats_update_begin(&rx_stats->syncp);
60 rx_stats->rx_packets++;
61 rx_stats->rx_bytes += skb->len;
62 if (skb->pkt_type == PACKET_MULTICAST)
63 rx_stats->rx_multicast++;
64 u64_stats_update_end(&rx_stats->syncp);
65
66 return true;
67}
68
69/* Must be invoked with rcu_read_lock or with RTNL. */
70struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
71 u16 vlan_id)
72{
73 struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
74
75 if (vlan_info) {
76 return vlan_group_get_device(&vlan_info->grp, vlan_id);
77 } else {
78 /*
79 * Bonding slaves do not have grp assigned to themselves.
80 * Grp is assigned to bonding master instead.
81 */
82 if (netif_is_bond_slave(real_dev))
83 return __vlan_find_dev_deep(real_dev->master, vlan_id);
84 }
85
86 return NULL;
87}
88EXPORT_SYMBOL(__vlan_find_dev_deep);
89
90struct net_device *vlan_dev_real_dev(const struct net_device *dev)
91{
92 return vlan_dev_priv(dev)->real_dev;
93}
94EXPORT_SYMBOL(vlan_dev_real_dev);
95
96u16 vlan_dev_vlan_id(const struct net_device *dev)
97{
98 return vlan_dev_priv(dev)->vlan_id;
99}
100EXPORT_SYMBOL(vlan_dev_vlan_id);
101
102static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
103{
104 if (skb_cow(skb, skb_headroom(skb)) < 0)
105 return NULL;
106 memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
107 skb->mac_header += VLAN_HLEN;
108 skb_reset_mac_len(skb);
109 return skb;
110}
111
112struct sk_buff *vlan_untag(struct sk_buff *skb)
113{
114 struct vlan_hdr *vhdr;
115 u16 vlan_tci;
116
117 if (unlikely(vlan_tx_tag_present(skb))) {
118 /* vlan_tci is already set-up so leave this for another time */
119 return skb;
120 }
121
122 skb = skb_share_check(skb, GFP_ATOMIC);
123 if (unlikely(!skb))
124 goto err_free;
125
126 if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
127 goto err_free;
128
129 vhdr = (struct vlan_hdr *) skb->data;
130 vlan_tci = ntohs(vhdr->h_vlan_TCI);
131 __vlan_hwaccel_put_tag(skb, vlan_tci);
132
133 skb_pull_rcsum(skb, VLAN_HLEN);
134 vlan_set_encap_proto(skb, vhdr);
135
136 skb = vlan_reorder_header(skb);
137 if (unlikely(!skb))
138 goto err_free;
139
140 skb_reset_network_header(skb);
141 skb_reset_transport_header(skb);
142 return skb;
143
144err_free:
145 kfree_skb(skb);
146 return NULL;
147}
148
149
150/*
151 * vlan info and vid list
152 */
153
154static void vlan_group_free(struct vlan_group *grp)
155{
156 int i;
157
158 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
159 kfree(grp->vlan_devices_arrays[i]);
160}
161
162static void vlan_info_free(struct vlan_info *vlan_info)
163{
164 vlan_group_free(&vlan_info->grp);
165 kfree(vlan_info);
166}
167
168static void vlan_info_rcu_free(struct rcu_head *rcu)
169{
170 vlan_info_free(container_of(rcu, struct vlan_info, rcu));
171}
172
173static struct vlan_info *vlan_info_alloc(struct net_device *dev)
174{
175 struct vlan_info *vlan_info;
176
177 vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
178 if (!vlan_info)
179 return NULL;
180
181 vlan_info->real_dev = dev;
182 INIT_LIST_HEAD(&vlan_info->vid_list);
183 return vlan_info;
184}
185
186struct vlan_vid_info {
187 struct list_head list;
188 unsigned short vid;
189 int refcount;
190};
191
192static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
193 unsigned short vid)
194{
195 struct vlan_vid_info *vid_info;
196
197 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
198 if (vid_info->vid == vid)
199 return vid_info;
200 }
201 return NULL;
202}
203
204static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
205{
206 struct vlan_vid_info *vid_info;
207
208 vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
209 if (!vid_info)
210 return NULL;
211 vid_info->vid = vid;
212
213 return vid_info;
214}
215
216static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
217 struct vlan_vid_info **pvid_info)
218{
219 struct net_device *dev = vlan_info->real_dev;
220 const struct net_device_ops *ops = dev->netdev_ops;
221 struct vlan_vid_info *vid_info;
222 int err;
223
224 vid_info = vlan_vid_info_alloc(vid);
225 if (!vid_info)
226 return -ENOMEM;
227
228 if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
229 ops->ndo_vlan_rx_add_vid) {
230 err = ops->ndo_vlan_rx_add_vid(dev, vid);
231 if (err) {
232 kfree(vid_info);
233 return err;
234 }
235 }
236 list_add(&vid_info->list, &vlan_info->vid_list);
237 vlan_info->nr_vids++;
238 *pvid_info = vid_info;
239 return 0;
240}
241
242int vlan_vid_add(struct net_device *dev, unsigned short vid)
243{
244 struct vlan_info *vlan_info;
245 struct vlan_vid_info *vid_info;
246 bool vlan_info_created = false;
247 int err;
248
249 ASSERT_RTNL();
250
251 vlan_info = rtnl_dereference(dev->vlan_info);
252 if (!vlan_info) {
253 vlan_info = vlan_info_alloc(dev);
254 if (!vlan_info)
255 return -ENOMEM;
256 vlan_info_created = true;
257 }
258 vid_info = vlan_vid_info_get(vlan_info, vid);
259 if (!vid_info) {
260 err = __vlan_vid_add(vlan_info, vid, &vid_info);
261 if (err)
262 goto out_free_vlan_info;
263 }
264 vid_info->refcount++;
265
266 if (vlan_info_created)
267 rcu_assign_pointer(dev->vlan_info, vlan_info);
268
269 return 0;
270
271out_free_vlan_info:
272 if (vlan_info_created)
273 kfree(vlan_info);
274 return err;
275}
276EXPORT_SYMBOL(vlan_vid_add);
277
278static void __vlan_vid_del(struct vlan_info *vlan_info,
279 struct vlan_vid_info *vid_info)
280{
281 struct net_device *dev = vlan_info->real_dev;
282 const struct net_device_ops *ops = dev->netdev_ops;
283 unsigned short vid = vid_info->vid;
284 int err;
285
286 if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
287 ops->ndo_vlan_rx_kill_vid) {
288 err = ops->ndo_vlan_rx_kill_vid(dev, vid);
289 if (err) {
290 pr_warn("failed to kill vid %d for device %s\n",
291 vid, dev->name);
292 }
293 }
294 list_del(&vid_info->list);
295 kfree(vid_info);
296 vlan_info->nr_vids--;
297}
298
299void vlan_vid_del(struct net_device *dev, unsigned short vid)
300{
301 struct vlan_info *vlan_info;
302 struct vlan_vid_info *vid_info;
303
304 ASSERT_RTNL();
305
306 vlan_info = rtnl_dereference(dev->vlan_info);
307 if (!vlan_info)
308 return;
309
310 vid_info = vlan_vid_info_get(vlan_info, vid);
311 if (!vid_info)
312 return;
313 vid_info->refcount--;
314 if (vid_info->refcount == 0) {
315 __vlan_vid_del(vlan_info, vid_info);
316 if (vlan_info->nr_vids == 0) {
317 RCU_INIT_POINTER(dev->vlan_info, NULL);
318 call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
319 }
320 }
321}
322EXPORT_SYMBOL(vlan_vid_del);
323
324int vlan_vids_add_by_dev(struct net_device *dev,
325 const struct net_device *by_dev)
326{
327 struct vlan_vid_info *vid_info;
328 struct vlan_info *vlan_info;
329 int err;
330
331 ASSERT_RTNL();
332
333 vlan_info = rtnl_dereference(by_dev->vlan_info);
334 if (!vlan_info)
335 return 0;
336
337 list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
338 err = vlan_vid_add(dev, vid_info->vid);
339 if (err)
340 goto unwind;
341 }
342 return 0;
343
344unwind:
345 list_for_each_entry_continue_reverse(vid_info,
346 &vlan_info->vid_list,
347 list) {
348 vlan_vid_del(dev, vid_info->vid);
349 }
350
351 return err;
352}
353EXPORT_SYMBOL(vlan_vids_add_by_dev);
354
355void vlan_vids_del_by_dev(struct net_device *dev,
356 const struct net_device *by_dev)
357{
358 struct vlan_vid_info *vid_info;
359 struct vlan_info *vlan_info;
360
361 ASSERT_RTNL();
362
363 vlan_info = rtnl_dereference(by_dev->vlan_info);
364 if (!vlan_info)
365 return;
366
367 list_for_each_entry(vid_info, &vlan_info->vid_list, list)
368 vlan_vid_del(dev, vid_info->vid);
369}
370EXPORT_SYMBOL(vlan_vids_del_by_dev);