Loading...
Note: File does not exist in v3.1.
1#include <linux/kernel.h>
2#include <linux/netdevice.h>
3#include <linux/rtnetlink.h>
4#include <linux/slab.h>
5#include <net/switchdev.h>
6
7#include "br_private.h"
8
9static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
10 const void *ptr)
11{
12 const struct net_bridge_vlan *vle = ptr;
13 u16 vid = *(u16 *)arg->key;
14
15 return vle->vid != vid;
16}
17
18static const struct rhashtable_params br_vlan_rht_params = {
19 .head_offset = offsetof(struct net_bridge_vlan, vnode),
20 .key_offset = offsetof(struct net_bridge_vlan, vid),
21 .key_len = sizeof(u16),
22 .nelem_hint = 3,
23 .locks_mul = 1,
24 .max_size = VLAN_N_VID,
25 .obj_cmpfn = br_vlan_cmp,
26 .automatic_shrinking = true,
27};
28
29static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
30{
31 return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
32}
33
34static void __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
35{
36 if (vg->pvid == vid)
37 return;
38
39 smp_wmb();
40 vg->pvid = vid;
41}
42
43static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
44{
45 if (vg->pvid != vid)
46 return;
47
48 smp_wmb();
49 vg->pvid = 0;
50}
51
52static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
53{
54 struct net_bridge_vlan_group *vg;
55
56 if (br_vlan_is_master(v))
57 vg = br_vlan_group(v->br);
58 else
59 vg = nbp_vlan_group(v->port);
60
61 if (flags & BRIDGE_VLAN_INFO_PVID)
62 __vlan_add_pvid(vg, v->vid);
63 else
64 __vlan_delete_pvid(vg, v->vid);
65
66 if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
67 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
68 else
69 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
70}
71
72static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
73 u16 vid, u16 flags)
74{
75 struct switchdev_obj_port_vlan v = {
76 .obj.orig_dev = dev,
77 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
78 .flags = flags,
79 .vid_begin = vid,
80 .vid_end = vid,
81 };
82 int err;
83
84 /* Try switchdev op first. In case it is not supported, fallback to
85 * 8021q add.
86 */
87 err = switchdev_port_obj_add(dev, &v.obj);
88 if (err == -EOPNOTSUPP)
89 return vlan_vid_add(dev, br->vlan_proto, vid);
90 return err;
91}
92
93static void __vlan_add_list(struct net_bridge_vlan *v)
94{
95 struct net_bridge_vlan_group *vg;
96 struct list_head *headp, *hpos;
97 struct net_bridge_vlan *vent;
98
99 if (br_vlan_is_master(v))
100 vg = br_vlan_group(v->br);
101 else
102 vg = nbp_vlan_group(v->port);
103
104 headp = &vg->vlan_list;
105 list_for_each_prev(hpos, headp) {
106 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
107 if (v->vid < vent->vid)
108 continue;
109 else
110 break;
111 }
112 list_add_rcu(&v->vlist, hpos);
113}
114
115static void __vlan_del_list(struct net_bridge_vlan *v)
116{
117 list_del_rcu(&v->vlist);
118}
119
120static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
121 u16 vid)
122{
123 struct switchdev_obj_port_vlan v = {
124 .obj.orig_dev = dev,
125 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
126 .vid_begin = vid,
127 .vid_end = vid,
128 };
129 int err;
130
131 /* Try switchdev op first. In case it is not supported, fallback to
132 * 8021q del.
133 */
134 err = switchdev_port_obj_del(dev, &v.obj);
135 if (err == -EOPNOTSUPP) {
136 vlan_vid_del(dev, br->vlan_proto, vid);
137 return 0;
138 }
139 return err;
140}
141
142/* Returns a master vlan, if it didn't exist it gets created. In all cases a
143 * a reference is taken to the master vlan before returning.
144 */
145static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
146{
147 struct net_bridge_vlan_group *vg;
148 struct net_bridge_vlan *masterv;
149
150 vg = br_vlan_group(br);
151 masterv = br_vlan_find(vg, vid);
152 if (!masterv) {
153 /* missing global ctx, create it now */
154 if (br_vlan_add(br, vid, 0))
155 return NULL;
156 masterv = br_vlan_find(vg, vid);
157 if (WARN_ON(!masterv))
158 return NULL;
159 }
160 atomic_inc(&masterv->refcnt);
161
162 return masterv;
163}
164
165static void br_vlan_put_master(struct net_bridge_vlan *masterv)
166{
167 struct net_bridge_vlan_group *vg;
168
169 if (!br_vlan_is_master(masterv))
170 return;
171
172 vg = br_vlan_group(masterv->br);
173 if (atomic_dec_and_test(&masterv->refcnt)) {
174 rhashtable_remove_fast(&vg->vlan_hash,
175 &masterv->vnode, br_vlan_rht_params);
176 __vlan_del_list(masterv);
177 kfree_rcu(masterv, rcu);
178 }
179}
180
181/* This is the shared VLAN add function which works for both ports and bridge
182 * devices. There are four possible calls to this function in terms of the
183 * vlan entry type:
184 * 1. vlan is being added on a port (no master flags, global entry exists)
185 * 2. vlan is being added on a bridge (both master and brentry flags)
186 * 3. vlan is being added on a port, but a global entry didn't exist which
187 * is being created right now (master flag set, brentry flag unset), the
188 * global entry is used for global per-vlan features, but not for filtering
189 * 4. same as 3 but with both master and brentry flags set so the entry
190 * will be used for filtering in both the port and the bridge
191 */
192static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
193{
194 struct net_bridge_vlan *masterv = NULL;
195 struct net_bridge_port *p = NULL;
196 struct net_bridge_vlan_group *vg;
197 struct net_device *dev;
198 struct net_bridge *br;
199 int err;
200
201 if (br_vlan_is_master(v)) {
202 br = v->br;
203 dev = br->dev;
204 vg = br_vlan_group(br);
205 } else {
206 p = v->port;
207 br = p->br;
208 dev = p->dev;
209 vg = nbp_vlan_group(p);
210 }
211
212 if (p) {
213 /* Add VLAN to the device filter if it is supported.
214 * This ensures tagged traffic enters the bridge when
215 * promiscuous mode is disabled by br_manage_promisc().
216 */
217 err = __vlan_vid_add(dev, br, v->vid, flags);
218 if (err)
219 goto out;
220
221 /* need to work on the master vlan too */
222 if (flags & BRIDGE_VLAN_INFO_MASTER) {
223 err = br_vlan_add(br, v->vid, flags |
224 BRIDGE_VLAN_INFO_BRENTRY);
225 if (err)
226 goto out_filt;
227 }
228
229 masterv = br_vlan_get_master(br, v->vid);
230 if (!masterv)
231 goto out_filt;
232 v->brvlan = masterv;
233 }
234
235 /* Add the dev mac and count the vlan only if it's usable */
236 if (br_vlan_should_use(v)) {
237 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
238 if (err) {
239 br_err(br, "failed insert local address into bridge forwarding table\n");
240 goto out_filt;
241 }
242 vg->num_vlans++;
243 }
244
245 err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
246 br_vlan_rht_params);
247 if (err)
248 goto out_fdb_insert;
249
250 __vlan_add_list(v);
251 __vlan_add_flags(v, flags);
252out:
253 return err;
254
255out_fdb_insert:
256 if (br_vlan_should_use(v)) {
257 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
258 vg->num_vlans--;
259 }
260
261out_filt:
262 if (p) {
263 __vlan_vid_del(dev, br, v->vid);
264 if (masterv) {
265 br_vlan_put_master(masterv);
266 v->brvlan = NULL;
267 }
268 }
269
270 goto out;
271}
272
273static int __vlan_del(struct net_bridge_vlan *v)
274{
275 struct net_bridge_vlan *masterv = v;
276 struct net_bridge_vlan_group *vg;
277 struct net_bridge_port *p = NULL;
278 int err = 0;
279
280 if (br_vlan_is_master(v)) {
281 vg = br_vlan_group(v->br);
282 } else {
283 p = v->port;
284 vg = nbp_vlan_group(v->port);
285 masterv = v->brvlan;
286 }
287
288 __vlan_delete_pvid(vg, v->vid);
289 if (p) {
290 err = __vlan_vid_del(p->dev, p->br, v->vid);
291 if (err)
292 goto out;
293 }
294
295 if (br_vlan_should_use(v)) {
296 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
297 vg->num_vlans--;
298 }
299
300 if (masterv != v) {
301 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
302 br_vlan_rht_params);
303 __vlan_del_list(v);
304 kfree_rcu(v, rcu);
305 }
306
307 br_vlan_put_master(masterv);
308out:
309 return err;
310}
311
312static void __vlan_group_free(struct net_bridge_vlan_group *vg)
313{
314 WARN_ON(!list_empty(&vg->vlan_list));
315 rhashtable_destroy(&vg->vlan_hash);
316 kfree(vg);
317}
318
319static void __vlan_flush(struct net_bridge_vlan_group *vg)
320{
321 struct net_bridge_vlan *vlan, *tmp;
322
323 __vlan_delete_pvid(vg, vg->pvid);
324 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
325 __vlan_del(vlan);
326}
327
328struct sk_buff *br_handle_vlan(struct net_bridge *br,
329 struct net_bridge_vlan_group *vg,
330 struct sk_buff *skb)
331{
332 struct net_bridge_vlan *v;
333 u16 vid;
334
335 /* If this packet was not filtered at input, let it pass */
336 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
337 goto out;
338
339 /* At this point, we know that the frame was filtered and contains
340 * a valid vlan id. If the vlan id has untagged flag set,
341 * send untagged; otherwise, send tagged.
342 */
343 br_vlan_get_tag(skb, &vid);
344 v = br_vlan_find(vg, vid);
345 /* Vlan entry must be configured at this point. The
346 * only exception is the bridge is set in promisc mode and the
347 * packet is destined for the bridge device. In this case
348 * pass the packet as is.
349 */
350 if (!v || !br_vlan_should_use(v)) {
351 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
352 goto out;
353 } else {
354 kfree_skb(skb);
355 return NULL;
356 }
357 }
358 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
359 skb->vlan_tci = 0;
360
361out:
362 return skb;
363}
364
365/* Called under RCU */
366static bool __allowed_ingress(struct net_bridge_vlan_group *vg, __be16 proto,
367 struct sk_buff *skb, u16 *vid)
368{
369 const struct net_bridge_vlan *v;
370 bool tagged;
371
372 BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
373 /* If vlan tx offload is disabled on bridge device and frame was
374 * sent from vlan device on the bridge device, it does not have
375 * HW accelerated vlan tag.
376 */
377 if (unlikely(!skb_vlan_tag_present(skb) &&
378 skb->protocol == proto)) {
379 skb = skb_vlan_untag(skb);
380 if (unlikely(!skb))
381 return false;
382 }
383
384 if (!br_vlan_get_tag(skb, vid)) {
385 /* Tagged frame */
386 if (skb->vlan_proto != proto) {
387 /* Protocol-mismatch, empty out vlan_tci for new tag */
388 skb_push(skb, ETH_HLEN);
389 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
390 skb_vlan_tag_get(skb));
391 if (unlikely(!skb))
392 return false;
393
394 skb_pull(skb, ETH_HLEN);
395 skb_reset_mac_len(skb);
396 *vid = 0;
397 tagged = false;
398 } else {
399 tagged = true;
400 }
401 } else {
402 /* Untagged frame */
403 tagged = false;
404 }
405
406 if (!*vid) {
407 u16 pvid = br_get_pvid(vg);
408
409 /* Frame had a tag with VID 0 or did not have a tag.
410 * See if pvid is set on this port. That tells us which
411 * vlan untagged or priority-tagged traffic belongs to.
412 */
413 if (!pvid)
414 goto drop;
415
416 /* PVID is set on this port. Any untagged or priority-tagged
417 * ingress frame is considered to belong to this vlan.
418 */
419 *vid = pvid;
420 if (likely(!tagged))
421 /* Untagged Frame. */
422 __vlan_hwaccel_put_tag(skb, proto, pvid);
423 else
424 /* Priority-tagged Frame.
425 * At this point, We know that skb->vlan_tci had
426 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
427 * We update only VID field and preserve PCP field.
428 */
429 skb->vlan_tci |= pvid;
430
431 return true;
432 }
433
434 /* Frame had a valid vlan tag. See if vlan is allowed */
435 v = br_vlan_find(vg, *vid);
436 if (v && br_vlan_should_use(v))
437 return true;
438drop:
439 kfree_skb(skb);
440 return false;
441}
442
443bool br_allowed_ingress(const struct net_bridge *br,
444 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
445 u16 *vid)
446{
447 /* If VLAN filtering is disabled on the bridge, all packets are
448 * permitted.
449 */
450 if (!br->vlan_enabled) {
451 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
452 return true;
453 }
454
455 return __allowed_ingress(vg, br->vlan_proto, skb, vid);
456}
457
458/* Called under RCU. */
459bool br_allowed_egress(struct net_bridge_vlan_group *vg,
460 const struct sk_buff *skb)
461{
462 const struct net_bridge_vlan *v;
463 u16 vid;
464
465 /* If this packet was not filtered at input, let it pass */
466 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
467 return true;
468
469 br_vlan_get_tag(skb, &vid);
470 v = br_vlan_find(vg, vid);
471 if (v && br_vlan_should_use(v))
472 return true;
473
474 return false;
475}
476
477/* Called under RCU */
478bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
479{
480 struct net_bridge_vlan_group *vg;
481 struct net_bridge *br = p->br;
482
483 /* If filtering was disabled at input, let it pass. */
484 if (!br->vlan_enabled)
485 return true;
486
487 vg = nbp_vlan_group_rcu(p);
488 if (!vg || !vg->num_vlans)
489 return false;
490
491 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
492 *vid = 0;
493
494 if (!*vid) {
495 *vid = br_get_pvid(vg);
496 if (!*vid)
497 return false;
498
499 return true;
500 }
501
502 if (br_vlan_find(vg, *vid))
503 return true;
504
505 return false;
506}
507
508/* Must be protected by RTNL.
509 * Must be called with vid in range from 1 to 4094 inclusive.
510 */
511int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
512{
513 struct net_bridge_vlan_group *vg;
514 struct net_bridge_vlan *vlan;
515 int ret;
516
517 ASSERT_RTNL();
518
519 vg = br_vlan_group(br);
520 vlan = br_vlan_find(vg, vid);
521 if (vlan) {
522 if (!br_vlan_is_brentry(vlan)) {
523 /* Trying to change flags of non-existent bridge vlan */
524 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
525 return -EINVAL;
526 /* It was only kept for port vlans, now make it real */
527 ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
528 vlan->vid);
529 if (ret) {
530 br_err(br, "failed insert local address into bridge forwarding table\n");
531 return ret;
532 }
533 atomic_inc(&vlan->refcnt);
534 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
535 vg->num_vlans++;
536 }
537 __vlan_add_flags(vlan, flags);
538 return 0;
539 }
540
541 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
542 if (!vlan)
543 return -ENOMEM;
544
545 vlan->vid = vid;
546 vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
547 vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
548 vlan->br = br;
549 if (flags & BRIDGE_VLAN_INFO_BRENTRY)
550 atomic_set(&vlan->refcnt, 1);
551 ret = __vlan_add(vlan, flags);
552 if (ret)
553 kfree(vlan);
554
555 return ret;
556}
557
558/* Must be protected by RTNL.
559 * Must be called with vid in range from 1 to 4094 inclusive.
560 */
561int br_vlan_delete(struct net_bridge *br, u16 vid)
562{
563 struct net_bridge_vlan_group *vg;
564 struct net_bridge_vlan *v;
565
566 ASSERT_RTNL();
567
568 vg = br_vlan_group(br);
569 v = br_vlan_find(vg, vid);
570 if (!v || !br_vlan_is_brentry(v))
571 return -ENOENT;
572
573 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
574 br_fdb_delete_by_port(br, NULL, vid, 0);
575
576 return __vlan_del(v);
577}
578
579void br_vlan_flush(struct net_bridge *br)
580{
581 struct net_bridge_vlan_group *vg;
582
583 ASSERT_RTNL();
584
585 vg = br_vlan_group(br);
586 __vlan_flush(vg);
587 RCU_INIT_POINTER(br->vlgrp, NULL);
588 synchronize_rcu();
589 __vlan_group_free(vg);
590}
591
592struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
593{
594 if (!vg)
595 return NULL;
596
597 return br_vlan_lookup(&vg->vlan_hash, vid);
598}
599
600/* Must be protected by RTNL. */
601static void recalculate_group_addr(struct net_bridge *br)
602{
603 if (br->group_addr_set)
604 return;
605
606 spin_lock_bh(&br->lock);
607 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
608 /* Bridge Group Address */
609 br->group_addr[5] = 0x00;
610 } else { /* vlan_enabled && ETH_P_8021AD */
611 /* Provider Bridge Group Address */
612 br->group_addr[5] = 0x08;
613 }
614 spin_unlock_bh(&br->lock);
615}
616
617/* Must be protected by RTNL. */
618void br_recalculate_fwd_mask(struct net_bridge *br)
619{
620 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
621 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
622 else /* vlan_enabled && ETH_P_8021AD */
623 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
624 ~(1u << br->group_addr[5]);
625}
626
627int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
628{
629 struct switchdev_attr attr = {
630 .orig_dev = br->dev,
631 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
632 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
633 .u.vlan_filtering = val,
634 };
635 int err;
636
637 if (br->vlan_enabled == val)
638 return 0;
639
640 err = switchdev_port_attr_set(br->dev, &attr);
641 if (err && err != -EOPNOTSUPP)
642 return err;
643
644 br->vlan_enabled = val;
645 br_manage_promisc(br);
646 recalculate_group_addr(br);
647 br_recalculate_fwd_mask(br);
648
649 return 0;
650}
651
652int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
653{
654 int err;
655
656 if (!rtnl_trylock())
657 return restart_syscall();
658
659 err = __br_vlan_filter_toggle(br, val);
660 rtnl_unlock();
661
662 return err;
663}
664
665int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
666{
667 int err = 0;
668 struct net_bridge_port *p;
669 struct net_bridge_vlan *vlan;
670 struct net_bridge_vlan_group *vg;
671 __be16 oldproto;
672
673 if (br->vlan_proto == proto)
674 return 0;
675
676 /* Add VLANs for the new proto to the device filter. */
677 list_for_each_entry(p, &br->port_list, list) {
678 vg = nbp_vlan_group(p);
679 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
680 err = vlan_vid_add(p->dev, proto, vlan->vid);
681 if (err)
682 goto err_filt;
683 }
684 }
685
686 oldproto = br->vlan_proto;
687 br->vlan_proto = proto;
688
689 recalculate_group_addr(br);
690 br_recalculate_fwd_mask(br);
691
692 /* Delete VLANs for the old proto from the device filter. */
693 list_for_each_entry(p, &br->port_list, list) {
694 vg = nbp_vlan_group(p);
695 list_for_each_entry(vlan, &vg->vlan_list, vlist)
696 vlan_vid_del(p->dev, oldproto, vlan->vid);
697 }
698
699 return 0;
700
701err_filt:
702 list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
703 vlan_vid_del(p->dev, proto, vlan->vid);
704
705 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
706 vg = nbp_vlan_group(p);
707 list_for_each_entry(vlan, &vg->vlan_list, vlist)
708 vlan_vid_del(p->dev, proto, vlan->vid);
709 }
710
711 return err;
712}
713
714int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
715{
716 int err;
717
718 if (val != ETH_P_8021Q && val != ETH_P_8021AD)
719 return -EPROTONOSUPPORT;
720
721 if (!rtnl_trylock())
722 return restart_syscall();
723
724 err = __br_vlan_set_proto(br, htons(val));
725 rtnl_unlock();
726
727 return err;
728}
729
730static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
731{
732 struct net_bridge_vlan *v;
733
734 if (vid != vg->pvid)
735 return false;
736
737 v = br_vlan_lookup(&vg->vlan_hash, vid);
738 if (v && br_vlan_should_use(v) &&
739 (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
740 return true;
741
742 return false;
743}
744
745static void br_vlan_disable_default_pvid(struct net_bridge *br)
746{
747 struct net_bridge_port *p;
748 u16 pvid = br->default_pvid;
749
750 /* Disable default_pvid on all ports where it is still
751 * configured.
752 */
753 if (vlan_default_pvid(br_vlan_group(br), pvid))
754 br_vlan_delete(br, pvid);
755
756 list_for_each_entry(p, &br->port_list, list) {
757 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
758 nbp_vlan_delete(p, pvid);
759 }
760
761 br->default_pvid = 0;
762}
763
764int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
765{
766 const struct net_bridge_vlan *pvent;
767 struct net_bridge_vlan_group *vg;
768 struct net_bridge_port *p;
769 u16 old_pvid;
770 int err = 0;
771 unsigned long *changed;
772
773 if (!pvid) {
774 br_vlan_disable_default_pvid(br);
775 return 0;
776 }
777
778 changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
779 GFP_KERNEL);
780 if (!changed)
781 return -ENOMEM;
782
783 old_pvid = br->default_pvid;
784
785 /* Update default_pvid config only if we do not conflict with
786 * user configuration.
787 */
788 vg = br_vlan_group(br);
789 pvent = br_vlan_find(vg, pvid);
790 if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
791 (!pvent || !br_vlan_should_use(pvent))) {
792 err = br_vlan_add(br, pvid,
793 BRIDGE_VLAN_INFO_PVID |
794 BRIDGE_VLAN_INFO_UNTAGGED |
795 BRIDGE_VLAN_INFO_BRENTRY);
796 if (err)
797 goto out;
798 br_vlan_delete(br, old_pvid);
799 set_bit(0, changed);
800 }
801
802 list_for_each_entry(p, &br->port_list, list) {
803 /* Update default_pvid config only if we do not conflict with
804 * user configuration.
805 */
806 vg = nbp_vlan_group(p);
807 if ((old_pvid &&
808 !vlan_default_pvid(vg, old_pvid)) ||
809 br_vlan_find(vg, pvid))
810 continue;
811
812 err = nbp_vlan_add(p, pvid,
813 BRIDGE_VLAN_INFO_PVID |
814 BRIDGE_VLAN_INFO_UNTAGGED);
815 if (err)
816 goto err_port;
817 nbp_vlan_delete(p, old_pvid);
818 set_bit(p->port_no, changed);
819 }
820
821 br->default_pvid = pvid;
822
823out:
824 kfree(changed);
825 return err;
826
827err_port:
828 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
829 if (!test_bit(p->port_no, changed))
830 continue;
831
832 if (old_pvid)
833 nbp_vlan_add(p, old_pvid,
834 BRIDGE_VLAN_INFO_PVID |
835 BRIDGE_VLAN_INFO_UNTAGGED);
836 nbp_vlan_delete(p, pvid);
837 }
838
839 if (test_bit(0, changed)) {
840 if (old_pvid)
841 br_vlan_add(br, old_pvid,
842 BRIDGE_VLAN_INFO_PVID |
843 BRIDGE_VLAN_INFO_UNTAGGED |
844 BRIDGE_VLAN_INFO_BRENTRY);
845 br_vlan_delete(br, pvid);
846 }
847 goto out;
848}
849
850int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
851{
852 u16 pvid = val;
853 int err = 0;
854
855 if (val >= VLAN_VID_MASK)
856 return -EINVAL;
857
858 if (!rtnl_trylock())
859 return restart_syscall();
860
861 if (pvid == br->default_pvid)
862 goto unlock;
863
864 /* Only allow default pvid change when filtering is disabled */
865 if (br->vlan_enabled) {
866 pr_info_once("Please disable vlan filtering to change default_pvid\n");
867 err = -EPERM;
868 goto unlock;
869 }
870 err = __br_vlan_set_default_pvid(br, pvid);
871unlock:
872 rtnl_unlock();
873 return err;
874}
875
876int br_vlan_init(struct net_bridge *br)
877{
878 struct net_bridge_vlan_group *vg;
879 int ret = -ENOMEM;
880
881 vg = kzalloc(sizeof(*vg), GFP_KERNEL);
882 if (!vg)
883 goto out;
884 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
885 if (ret)
886 goto err_rhtbl;
887 INIT_LIST_HEAD(&vg->vlan_list);
888 br->vlan_proto = htons(ETH_P_8021Q);
889 br->default_pvid = 1;
890 rcu_assign_pointer(br->vlgrp, vg);
891 ret = br_vlan_add(br, 1,
892 BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
893 BRIDGE_VLAN_INFO_BRENTRY);
894 if (ret)
895 goto err_vlan_add;
896
897out:
898 return ret;
899
900err_vlan_add:
901 rhashtable_destroy(&vg->vlan_hash);
902err_rhtbl:
903 kfree(vg);
904
905 goto out;
906}
907
908int nbp_vlan_init(struct net_bridge_port *p)
909{
910 struct switchdev_attr attr = {
911 .orig_dev = p->br->dev,
912 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
913 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
914 .u.vlan_filtering = p->br->vlan_enabled,
915 };
916 struct net_bridge_vlan_group *vg;
917 int ret = -ENOMEM;
918
919 vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
920 if (!vg)
921 goto out;
922
923 ret = switchdev_port_attr_set(p->dev, &attr);
924 if (ret && ret != -EOPNOTSUPP)
925 goto err_vlan_enabled;
926
927 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
928 if (ret)
929 goto err_rhtbl;
930 INIT_LIST_HEAD(&vg->vlan_list);
931 rcu_assign_pointer(p->vlgrp, vg);
932 if (p->br->default_pvid) {
933 ret = nbp_vlan_add(p, p->br->default_pvid,
934 BRIDGE_VLAN_INFO_PVID |
935 BRIDGE_VLAN_INFO_UNTAGGED);
936 if (ret)
937 goto err_vlan_add;
938 }
939out:
940 return ret;
941
942err_vlan_add:
943 RCU_INIT_POINTER(p->vlgrp, NULL);
944 synchronize_rcu();
945 rhashtable_destroy(&vg->vlan_hash);
946err_vlan_enabled:
947err_rhtbl:
948 kfree(vg);
949
950 goto out;
951}
952
953/* Must be protected by RTNL.
954 * Must be called with vid in range from 1 to 4094 inclusive.
955 */
956int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
957{
958 struct switchdev_obj_port_vlan v = {
959 .obj.orig_dev = port->dev,
960 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
961 .flags = flags,
962 .vid_begin = vid,
963 .vid_end = vid,
964 };
965 struct net_bridge_vlan *vlan;
966 int ret;
967
968 ASSERT_RTNL();
969
970 vlan = br_vlan_find(nbp_vlan_group(port), vid);
971 if (vlan) {
972 /* Pass the flags to the hardware bridge */
973 ret = switchdev_port_obj_add(port->dev, &v.obj);
974 if (ret && ret != -EOPNOTSUPP)
975 return ret;
976 __vlan_add_flags(vlan, flags);
977 return 0;
978 }
979
980 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
981 if (!vlan)
982 return -ENOMEM;
983
984 vlan->vid = vid;
985 vlan->port = port;
986 ret = __vlan_add(vlan, flags);
987 if (ret)
988 kfree(vlan);
989
990 return ret;
991}
992
993/* Must be protected by RTNL.
994 * Must be called with vid in range from 1 to 4094 inclusive.
995 */
996int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
997{
998 struct net_bridge_vlan *v;
999
1000 ASSERT_RTNL();
1001
1002 v = br_vlan_find(nbp_vlan_group(port), vid);
1003 if (!v)
1004 return -ENOENT;
1005 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1006 br_fdb_delete_by_port(port->br, port, vid, 0);
1007
1008 return __vlan_del(v);
1009}
1010
1011void nbp_vlan_flush(struct net_bridge_port *port)
1012{
1013 struct net_bridge_vlan_group *vg;
1014
1015 ASSERT_RTNL();
1016
1017 vg = nbp_vlan_group(port);
1018 __vlan_flush(vg);
1019 RCU_INIT_POINTER(port->vlgrp, NULL);
1020 synchronize_rcu();
1021 __vlan_group_free(vg);
1022}