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xtensa: fix high memory/reserved memory collision
[cris-mirror.git] / net / bridge / br_vlan.c
blob51935270c6512529b87bb252dcc64f6be17719f1
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 #include "br_private_tunnel.h"
9
10 static inline int br_vlan_cmp(struct rhashtable_compare_arg *arg,
11 const void *ptr)
12 {
13 const struct net_bridge_vlan *vle = ptr;
14 u16 vid = *(u16 *)arg->key;
15
16 return vle->vid != vid;
17 }
18
19 static const struct rhashtable_params br_vlan_rht_params = {
20 .head_offset = offsetof(struct net_bridge_vlan, vnode),
21 .key_offset = offsetof(struct net_bridge_vlan, vid),
22 .key_len = sizeof(u16),
23 .nelem_hint = 3,
24 .locks_mul = 1,
25 .max_size = VLAN_N_VID,
26 .obj_cmpfn = br_vlan_cmp,
27 .automatic_shrinking = true,
28 };
29
30 static struct net_bridge_vlan *br_vlan_lookup(struct rhashtable *tbl, u16 vid)
31 {
32 return rhashtable_lookup_fast(tbl, &vid, br_vlan_rht_params);
33 }
34
35 static bool __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
36 {
37 if (vg->pvid == vid)
38 return false;
39
40 smp_wmb();
41 vg->pvid = vid;
42
43 return true;
44 }
45
46 static bool __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
47 {
48 if (vg->pvid != vid)
49 return false;
50
51 smp_wmb();
52 vg->pvid = 0;
53
54 return true;
55 }
56
57 /* return true if anything changed, false otherwise */
58 static bool __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
59 {
60 struct net_bridge_vlan_group *vg;
61 u16 old_flags = v->flags;
62 bool ret;
63
64 if (br_vlan_is_master(v))
65 vg = br_vlan_group(v->br);
66 else
67 vg = nbp_vlan_group(v->port);
68
69 if (flags & BRIDGE_VLAN_INFO_PVID)
70 ret = __vlan_add_pvid(vg, v->vid);
71 else
72 ret = __vlan_delete_pvid(vg, v->vid);
73
74 if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
75 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
76 else
77 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
78
79 return ret || !!(old_flags ^ v->flags);
80 }
81
82 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
83 u16 vid, u16 flags)
84 {
85 struct switchdev_obj_port_vlan v = {
86 .obj.orig_dev = dev,
87 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
88 .flags = flags,
89 .vid_begin = vid,
90 .vid_end = vid,
91 };
92 int err;
93
94 /* Try switchdev op first. In case it is not supported, fallback to
95 * 8021q add.
96 */
97 err = switchdev_port_obj_add(dev, &v.obj);
98 if (err == -EOPNOTSUPP)
99 return vlan_vid_add(dev, br->vlan_proto, vid);
100 return err;
101 }
102
103 static void __vlan_add_list(struct net_bridge_vlan *v)
104 {
105 struct net_bridge_vlan_group *vg;
106 struct list_head *headp, *hpos;
107 struct net_bridge_vlan *vent;
108
109 if (br_vlan_is_master(v))
110 vg = br_vlan_group(v->br);
111 else
112 vg = nbp_vlan_group(v->port);
113
114 headp = &vg->vlan_list;
115 list_for_each_prev(hpos, headp) {
116 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
117 if (v->vid < vent->vid)
118 continue;
119 else
120 break;
121 }
122 list_add_rcu(&v->vlist, hpos);
123 }
124
125 static void __vlan_del_list(struct net_bridge_vlan *v)
126 {
127 list_del_rcu(&v->vlist);
128 }
129
130 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
131 u16 vid)
132 {
133 struct switchdev_obj_port_vlan v = {
134 .obj.orig_dev = dev,
135 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
136 .vid_begin = vid,
137 .vid_end = vid,
138 };
139 int err;
140
141 /* Try switchdev op first. In case it is not supported, fallback to
142 * 8021q del.
143 */
144 err = switchdev_port_obj_del(dev, &v.obj);
145 if (err == -EOPNOTSUPP) {
146 vlan_vid_del(dev, br->vlan_proto, vid);
147 return 0;
148 }
149 return err;
150 }
151
152 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
153 * a reference is taken to the master vlan before returning.
154 */
155 static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
156 {
157 struct net_bridge_vlan_group *vg;
158 struct net_bridge_vlan *masterv;
159
160 vg = br_vlan_group(br);
161 masterv = br_vlan_find(vg, vid);
162 if (!masterv) {
163 bool changed;
164
165 /* missing global ctx, create it now */
166 if (br_vlan_add(br, vid, 0, &changed))
167 return NULL;
168 masterv = br_vlan_find(vg, vid);
169 if (WARN_ON(!masterv))
170 return NULL;
171 }
172 refcount_inc(&masterv->refcnt);
173
174 return masterv;
175 }
176
177 static void br_master_vlan_rcu_free(struct rcu_head *rcu)
178 {
179 struct net_bridge_vlan *v;
180
181 v = container_of(rcu, struct net_bridge_vlan, rcu);
182 WARN_ON(!br_vlan_is_master(v));
183 free_percpu(v->stats);
184 v->stats = NULL;
185 kfree(v);
186 }
187
188 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
189 {
190 struct net_bridge_vlan_group *vg;
191
192 if (!br_vlan_is_master(masterv))
193 return;
194
195 vg = br_vlan_group(masterv->br);
196 if (refcount_dec_and_test(&masterv->refcnt)) {
197 rhashtable_remove_fast(&vg->vlan_hash,
198 &masterv->vnode, br_vlan_rht_params);
199 __vlan_del_list(masterv);
200 call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
201 }
202 }
203
204 /* This is the shared VLAN add function which works for both ports and bridge
205 * devices. There are four possible calls to this function in terms of the
206 * vlan entry type:
207 * 1. vlan is being added on a port (no master flags, global entry exists)
208 * 2. vlan is being added on a bridge (both master and brentry flags)
209 * 3. vlan is being added on a port, but a global entry didn't exist which
210 * is being created right now (master flag set, brentry flag unset), the
211 * global entry is used for global per-vlan features, but not for filtering
212 * 4. same as 3 but with both master and brentry flags set so the entry
213 * will be used for filtering in both the port and the bridge
214 */
215 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
216 {
217 struct net_bridge_vlan *masterv = NULL;
218 struct net_bridge_port *p = NULL;
219 struct net_bridge_vlan_group *vg;
220 struct net_device *dev;
221 struct net_bridge *br;
222 int err;
223
224 if (br_vlan_is_master(v)) {
225 br = v->br;
226 dev = br->dev;
227 vg = br_vlan_group(br);
228 } else {
229 p = v->port;
230 br = p->br;
231 dev = p->dev;
232 vg = nbp_vlan_group(p);
233 }
234
235 if (p) {
236 /* Add VLAN to the device filter if it is supported.
237 * This ensures tagged traffic enters the bridge when
238 * promiscuous mode is disabled by br_manage_promisc().
239 */
240 err = __vlan_vid_add(dev, br, v->vid, flags);
241 if (err)
242 goto out;
243
244 /* need to work on the master vlan too */
245 if (flags & BRIDGE_VLAN_INFO_MASTER) {
246 bool changed;
247
248 err = br_vlan_add(br, v->vid,
249 flags | BRIDGE_VLAN_INFO_BRENTRY,
250 &changed);
251 if (err)
252 goto out_filt;
253 }
254
255 masterv = br_vlan_get_master(br, v->vid);
256 if (!masterv)
257 goto out_filt;
258 v->brvlan = masterv;
259 v->stats = masterv->stats;
260 }
261
262 /* Add the dev mac and count the vlan only if it's usable */
263 if (br_vlan_should_use(v)) {
264 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
265 if (err) {
266 br_err(br, "failed insert local address into bridge forwarding table\n");
267 goto out_filt;
268 }
269 vg->num_vlans++;
270 }
271
272 err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
273 br_vlan_rht_params);
274 if (err)
275 goto out_fdb_insert;
276
277 __vlan_add_list(v);
278 __vlan_add_flags(v, flags);
279 out:
280 return err;
281
282 out_fdb_insert:
283 if (br_vlan_should_use(v)) {
284 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
285 vg->num_vlans--;
286 }
287
288 out_filt:
289 if (p) {
290 __vlan_vid_del(dev, br, v->vid);
291 if (masterv) {
292 br_vlan_put_master(masterv);
293 v->brvlan = NULL;
294 }
295 }
296
297 goto out;
298 }
299
300 static int __vlan_del(struct net_bridge_vlan *v)
301 {
302 struct net_bridge_vlan *masterv = v;
303 struct net_bridge_vlan_group *vg;
304 struct net_bridge_port *p = NULL;
305 int err = 0;
306
307 if (br_vlan_is_master(v)) {
308 vg = br_vlan_group(v->br);
309 } else {
310 p = v->port;
311 vg = nbp_vlan_group(v->port);
312 masterv = v->brvlan;
313 }
314
315 __vlan_delete_pvid(vg, v->vid);
316 if (p) {
317 err = __vlan_vid_del(p->dev, p->br, v->vid);
318 if (err)
319 goto out;
320 }
321
322 if (br_vlan_should_use(v)) {
323 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
324 vg->num_vlans--;
325 }
326
327 if (masterv != v) {
328 vlan_tunnel_info_del(vg, v);
329 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
330 br_vlan_rht_params);
331 __vlan_del_list(v);
332 kfree_rcu(v, rcu);
333 }
334
335 br_vlan_put_master(masterv);
336 out:
337 return err;
338 }
339
340 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
341 {
342 WARN_ON(!list_empty(&vg->vlan_list));
343 rhashtable_destroy(&vg->vlan_hash);
344 vlan_tunnel_deinit(vg);
345 kfree(vg);
346 }
347
348 static void __vlan_flush(struct net_bridge_vlan_group *vg)
349 {
350 struct net_bridge_vlan *vlan, *tmp;
351
352 __vlan_delete_pvid(vg, vg->pvid);
353 list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
354 __vlan_del(vlan);
355 }
356
357 struct sk_buff *br_handle_vlan(struct net_bridge *br,
358 const struct net_bridge_port *p,
359 struct net_bridge_vlan_group *vg,
360 struct sk_buff *skb)
361 {
362 struct br_vlan_stats *stats;
363 struct net_bridge_vlan *v;
364 u16 vid;
365
366 /* If this packet was not filtered at input, let it pass */
367 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
368 goto out;
369
370 /* At this point, we know that the frame was filtered and contains
371 * a valid vlan id. If the vlan id has untagged flag set,
372 * send untagged; otherwise, send tagged.
373 */
374 br_vlan_get_tag(skb, &vid);
375 v = br_vlan_find(vg, vid);
376 /* Vlan entry must be configured at this point. The
377 * only exception is the bridge is set in promisc mode and the
378 * packet is destined for the bridge device. In this case
379 * pass the packet as is.
380 */
381 if (!v || !br_vlan_should_use(v)) {
382 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
383 goto out;
384 } else {
385 kfree_skb(skb);
386 return NULL;
387 }
388 }
389 if (br->vlan_stats_enabled) {
390 stats = this_cpu_ptr(v->stats);
391 u64_stats_update_begin(&stats->syncp);
392 stats->tx_bytes += skb->len;
393 stats->tx_packets++;
394 u64_stats_update_end(&stats->syncp);
395 }
396
397 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
398 skb->vlan_tci = 0;
399
400 if (p && (p->flags & BR_VLAN_TUNNEL) &&
401 br_handle_egress_vlan_tunnel(skb, v)) {
402 kfree_skb(skb);
403 return NULL;
404 }
405 out:
406 return skb;
407 }
408
409 /* Called under RCU */
410 static bool __allowed_ingress(const struct net_bridge *br,
411 struct net_bridge_vlan_group *vg,
412 struct sk_buff *skb, u16 *vid)
413 {
414 struct br_vlan_stats *stats;
415 struct net_bridge_vlan *v;
416 bool tagged;
417
418 BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
419 /* If vlan tx offload is disabled on bridge device and frame was
420 * sent from vlan device on the bridge device, it does not have
421 * HW accelerated vlan tag.
422 */
423 if (unlikely(!skb_vlan_tag_present(skb) &&
424 skb->protocol == br->vlan_proto)) {
425 skb = skb_vlan_untag(skb);
426 if (unlikely(!skb))
427 return false;
428 }
429
430 if (!br_vlan_get_tag(skb, vid)) {
431 /* Tagged frame */
432 if (skb->vlan_proto != br->vlan_proto) {
433 /* Protocol-mismatch, empty out vlan_tci for new tag */
434 skb_push(skb, ETH_HLEN);
435 skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
436 skb_vlan_tag_get(skb));
437 if (unlikely(!skb))
438 return false;
439
440 skb_pull(skb, ETH_HLEN);
441 skb_reset_mac_len(skb);
442 *vid = 0;
443 tagged = false;
444 } else {
445 tagged = true;
446 }
447 } else {
448 /* Untagged frame */
449 tagged = false;
450 }
451
452 if (!*vid) {
453 u16 pvid = br_get_pvid(vg);
454
455 /* Frame had a tag with VID 0 or did not have a tag.
456 * See if pvid is set on this port. That tells us which
457 * vlan untagged or priority-tagged traffic belongs to.
458 */
459 if (!pvid)
460 goto drop;
461
462 /* PVID is set on this port. Any untagged or priority-tagged
463 * ingress frame is considered to belong to this vlan.
464 */
465 *vid = pvid;
466 if (likely(!tagged))
467 /* Untagged Frame. */
468 __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
469 else
470 /* Priority-tagged Frame.
471 * At this point, We know that skb->vlan_tci had
472 * VLAN_TAG_PRESENT bit and its VID field was 0x000.
473 * We update only VID field and preserve PCP field.
474 */
475 skb->vlan_tci |= pvid;
476
477 /* if stats are disabled we can avoid the lookup */
478 if (!br->vlan_stats_enabled)
479 return true;
480 }
481 v = br_vlan_find(vg, *vid);
482 if (!v || !br_vlan_should_use(v))
483 goto drop;
484
485 if (br->vlan_stats_enabled) {
486 stats = this_cpu_ptr(v->stats);
487 u64_stats_update_begin(&stats->syncp);
488 stats->rx_bytes += skb->len;
489 stats->rx_packets++;
490 u64_stats_update_end(&stats->syncp);
491 }
492
493 return true;
494
495 drop:
496 kfree_skb(skb);
497 return false;
498 }
499
500 bool br_allowed_ingress(const struct net_bridge *br,
501 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
502 u16 *vid)
503 {
504 /* If VLAN filtering is disabled on the bridge, all packets are
505 * permitted.
506 */
507 if (!br->vlan_enabled) {
508 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
509 return true;
510 }
511
512 return __allowed_ingress(br, vg, skb, vid);
513 }
514
515 /* Called under RCU. */
516 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
517 const struct sk_buff *skb)
518 {
519 const struct net_bridge_vlan *v;
520 u16 vid;
521
522 /* If this packet was not filtered at input, let it pass */
523 if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
524 return true;
525
526 br_vlan_get_tag(skb, &vid);
527 v = br_vlan_find(vg, vid);
528 if (v && br_vlan_should_use(v))
529 return true;
530
531 return false;
532 }
533
534 /* Called under RCU */
535 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
536 {
537 struct net_bridge_vlan_group *vg;
538 struct net_bridge *br = p->br;
539
540 /* If filtering was disabled at input, let it pass. */
541 if (!br->vlan_enabled)
542 return true;
543
544 vg = nbp_vlan_group_rcu(p);
545 if (!vg || !vg->num_vlans)
546 return false;
547
548 if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
549 *vid = 0;
550
551 if (!*vid) {
552 *vid = br_get_pvid(vg);
553 if (!*vid)
554 return false;
555
556 return true;
557 }
558
559 if (br_vlan_find(vg, *vid))
560 return true;
561
562 return false;
563 }
564
565 /* Must be protected by RTNL.
566 * Must be called with vid in range from 1 to 4094 inclusive.
567 * changed must be true only if the vlan was created or updated
568 */
569 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, bool *changed)
570 {
571 struct net_bridge_vlan_group *vg;
572 struct net_bridge_vlan *vlan;
573 int ret;
574
575 ASSERT_RTNL();
576
577 *changed = false;
578 vg = br_vlan_group(br);
579 vlan = br_vlan_find(vg, vid);
580 if (vlan) {
581 if (!br_vlan_is_brentry(vlan)) {
582 /* Trying to change flags of non-existent bridge vlan */
583 if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
584 return -EINVAL;
585 /* It was only kept for port vlans, now make it real */
586 ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
587 vlan->vid);
588 if (ret) {
589 br_err(br, "failed insert local address into bridge forwarding table\n");
590 return ret;
591 }
592 refcount_inc(&vlan->refcnt);
593 vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
594 vg->num_vlans++;
595 *changed = true;
596 }
597 if (__vlan_add_flags(vlan, flags))
598 *changed = true;
599
600 return 0;
601 }
602
603 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
604 if (!vlan)
605 return -ENOMEM;
606
607 vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
608 if (!vlan->stats) {
609 kfree(vlan);
610 return -ENOMEM;
611 }
612 vlan->vid = vid;
613 vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
614 vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
615 vlan->br = br;
616 if (flags & BRIDGE_VLAN_INFO_BRENTRY)
617 refcount_set(&vlan->refcnt, 1);
618 ret = __vlan_add(vlan, flags);
619 if (ret) {
620 free_percpu(vlan->stats);
621 kfree(vlan);
622 } else {
623 *changed = true;
624 }
625
626 return ret;
627 }
628
629 /* Must be protected by RTNL.
630 * Must be called with vid in range from 1 to 4094 inclusive.
631 */
632 int br_vlan_delete(struct net_bridge *br, u16 vid)
633 {
634 struct net_bridge_vlan_group *vg;
635 struct net_bridge_vlan *v;
636
637 ASSERT_RTNL();
638
639 vg = br_vlan_group(br);
640 v = br_vlan_find(vg, vid);
641 if (!v || !br_vlan_is_brentry(v))
642 return -ENOENT;
643
644 br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
645 br_fdb_delete_by_port(br, NULL, vid, 0);
646
647 vlan_tunnel_info_del(vg, v);
648
649 return __vlan_del(v);
650 }
651
652 void br_vlan_flush(struct net_bridge *br)
653 {
654 struct net_bridge_vlan_group *vg;
655
656 ASSERT_RTNL();
657
658 vg = br_vlan_group(br);
659 __vlan_flush(vg);
660 RCU_INIT_POINTER(br->vlgrp, NULL);
661 synchronize_rcu();
662 __vlan_group_free(vg);
663 }
664
665 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
666 {
667 if (!vg)
668 return NULL;
669
670 return br_vlan_lookup(&vg->vlan_hash, vid);
671 }
672
673 /* Must be protected by RTNL. */
674 static void recalculate_group_addr(struct net_bridge *br)
675 {
676 if (br->group_addr_set)
677 return;
678
679 spin_lock_bh(&br->lock);
680 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
681 /* Bridge Group Address */
682 br->group_addr[5] = 0x00;
683 } else { /* vlan_enabled && ETH_P_8021AD */
684 /* Provider Bridge Group Address */
685 br->group_addr[5] = 0x08;
686 }
687 spin_unlock_bh(&br->lock);
688 }
689
690 /* Must be protected by RTNL. */
691 void br_recalculate_fwd_mask(struct net_bridge *br)
692 {
693 if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
694 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
695 else /* vlan_enabled && ETH_P_8021AD */
696 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
697 ~(1u << br->group_addr[5]);
698 }
699
700 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
701 {
702 struct switchdev_attr attr = {
703 .orig_dev = br->dev,
704 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
705 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
706 .u.vlan_filtering = val,
707 };
708 int err;
709
710 if (br->vlan_enabled == val)
711 return 0;
712
713 err = switchdev_port_attr_set(br->dev, &attr);
714 if (err && err != -EOPNOTSUPP)
715 return err;
716
717 br->vlan_enabled = val;
718 br_manage_promisc(br);
719 recalculate_group_addr(br);
720 br_recalculate_fwd_mask(br);
721
722 return 0;
723 }
724
725 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
726 {
727 return __br_vlan_filter_toggle(br, val);
728 }
729
730 bool br_vlan_enabled(const struct net_device *dev)
731 {
732 struct net_bridge *br = netdev_priv(dev);
733
734 return !!br->vlan_enabled;
735 }
736 EXPORT_SYMBOL_GPL(br_vlan_enabled);
737
738 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
739 {
740 int err = 0;
741 struct net_bridge_port *p;
742 struct net_bridge_vlan *vlan;
743 struct net_bridge_vlan_group *vg;
744 __be16 oldproto;
745
746 if (br->vlan_proto == proto)
747 return 0;
748
749 /* Add VLANs for the new proto to the device filter. */
750 list_for_each_entry(p, &br->port_list, list) {
751 vg = nbp_vlan_group(p);
752 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
753 err = vlan_vid_add(p->dev, proto, vlan->vid);
754 if (err)
755 goto err_filt;
756 }
757 }
758
759 oldproto = br->vlan_proto;
760 br->vlan_proto = proto;
761
762 recalculate_group_addr(br);
763 br_recalculate_fwd_mask(br);
764
765 /* Delete VLANs for the old proto from the device filter. */
766 list_for_each_entry(p, &br->port_list, list) {
767 vg = nbp_vlan_group(p);
768 list_for_each_entry(vlan, &vg->vlan_list, vlist)
769 vlan_vid_del(p->dev, oldproto, vlan->vid);
770 }
771
772 return 0;
773
774 err_filt:
775 list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
776 vlan_vid_del(p->dev, proto, vlan->vid);
777
778 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
779 vg = nbp_vlan_group(p);
780 list_for_each_entry(vlan, &vg->vlan_list, vlist)
781 vlan_vid_del(p->dev, proto, vlan->vid);
782 }
783
784 return err;
785 }
786
787 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
788 {
789 if (val != ETH_P_8021Q && val != ETH_P_8021AD)
790 return -EPROTONOSUPPORT;
791
792 return __br_vlan_set_proto(br, htons(val));
793 }
794
795 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
796 {
797 switch (val) {
798 case 0:
799 case 1:
800 br->vlan_stats_enabled = val;
801 break;
802 default:
803 return -EINVAL;
804 }
805
806 return 0;
807 }
808
809 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
810 {
811 struct net_bridge_vlan *v;
812
813 if (vid != vg->pvid)
814 return false;
815
816 v = br_vlan_lookup(&vg->vlan_hash, vid);
817 if (v && br_vlan_should_use(v) &&
818 (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
819 return true;
820
821 return false;
822 }
823
824 static void br_vlan_disable_default_pvid(struct net_bridge *br)
825 {
826 struct net_bridge_port *p;
827 u16 pvid = br->default_pvid;
828
829 /* Disable default_pvid on all ports where it is still
830 * configured.
831 */
832 if (vlan_default_pvid(br_vlan_group(br), pvid))
833 br_vlan_delete(br, pvid);
834
835 list_for_each_entry(p, &br->port_list, list) {
836 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
837 nbp_vlan_delete(p, pvid);
838 }
839
840 br->default_pvid = 0;
841 }
842
843 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
844 {
845 const struct net_bridge_vlan *pvent;
846 struct net_bridge_vlan_group *vg;
847 struct net_bridge_port *p;
848 unsigned long *changed;
849 bool vlchange;
850 u16 old_pvid;
851 int err = 0;
852
853 if (!pvid) {
854 br_vlan_disable_default_pvid(br);
855 return 0;
856 }
857
858 changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
859 GFP_KERNEL);
860 if (!changed)
861 return -ENOMEM;
862
863 old_pvid = br->default_pvid;
864
865 /* Update default_pvid config only if we do not conflict with
866 * user configuration.
867 */
868 vg = br_vlan_group(br);
869 pvent = br_vlan_find(vg, pvid);
870 if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
871 (!pvent || !br_vlan_should_use(pvent))) {
872 err = br_vlan_add(br, pvid,
873 BRIDGE_VLAN_INFO_PVID |
874 BRIDGE_VLAN_INFO_UNTAGGED |
875 BRIDGE_VLAN_INFO_BRENTRY,
876 &vlchange);
877 if (err)
878 goto out;
879 br_vlan_delete(br, old_pvid);
880 set_bit(0, changed);
881 }
882
883 list_for_each_entry(p, &br->port_list, list) {
884 /* Update default_pvid config only if we do not conflict with
885 * user configuration.
886 */
887 vg = nbp_vlan_group(p);
888 if ((old_pvid &&
889 !vlan_default_pvid(vg, old_pvid)) ||
890 br_vlan_find(vg, pvid))
891 continue;
892
893 err = nbp_vlan_add(p, pvid,
894 BRIDGE_VLAN_INFO_PVID |
895 BRIDGE_VLAN_INFO_UNTAGGED,
896 &vlchange);
897 if (err)
898 goto err_port;
899 nbp_vlan_delete(p, old_pvid);
900 set_bit(p->port_no, changed);
901 }
902
903 br->default_pvid = pvid;
904
905 out:
906 kfree(changed);
907 return err;
908
909 err_port:
910 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
911 if (!test_bit(p->port_no, changed))
912 continue;
913
914 if (old_pvid)
915 nbp_vlan_add(p, old_pvid,
916 BRIDGE_VLAN_INFO_PVID |
917 BRIDGE_VLAN_INFO_UNTAGGED,
918 &vlchange);
919 nbp_vlan_delete(p, pvid);
920 }
921
922 if (test_bit(0, changed)) {
923 if (old_pvid)
924 br_vlan_add(br, old_pvid,
925 BRIDGE_VLAN_INFO_PVID |
926 BRIDGE_VLAN_INFO_UNTAGGED |
927 BRIDGE_VLAN_INFO_BRENTRY,
928 &vlchange);
929 br_vlan_delete(br, pvid);
930 }
931 goto out;
932 }
933
934 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
935 {
936 u16 pvid = val;
937 int err = 0;
938
939 if (val >= VLAN_VID_MASK)
940 return -EINVAL;
941
942 if (pvid == br->default_pvid)
943 goto out;
944
945 /* Only allow default pvid change when filtering is disabled */
946 if (br->vlan_enabled) {
947 pr_info_once("Please disable vlan filtering to change default_pvid\n");
948 err = -EPERM;
949 goto out;
950 }
951 err = __br_vlan_set_default_pvid(br, pvid);
952 out:
953 return err;
954 }
955
956 int br_vlan_init(struct net_bridge *br)
957 {
958 struct net_bridge_vlan_group *vg;
959 int ret = -ENOMEM;
960 bool changed;
961
962 vg = kzalloc(sizeof(*vg), GFP_KERNEL);
963 if (!vg)
964 goto out;
965 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
966 if (ret)
967 goto err_rhtbl;
968 ret = vlan_tunnel_init(vg);
969 if (ret)
970 goto err_tunnel_init;
971 INIT_LIST_HEAD(&vg->vlan_list);
972 br->vlan_proto = htons(ETH_P_8021Q);
973 br->default_pvid = 1;
974 rcu_assign_pointer(br->vlgrp, vg);
975 ret = br_vlan_add(br, 1,
976 BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
977 BRIDGE_VLAN_INFO_BRENTRY, &changed);
978 if (ret)
979 goto err_vlan_add;
980
981 out:
982 return ret;
983
984 err_vlan_add:
985 vlan_tunnel_deinit(vg);
986 err_tunnel_init:
987 rhashtable_destroy(&vg->vlan_hash);
988 err_rhtbl:
989 kfree(vg);
990
991 goto out;
992 }
993
994 int nbp_vlan_init(struct net_bridge_port *p)
995 {
996 struct switchdev_attr attr = {
997 .orig_dev = p->br->dev,
998 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
999 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
1000 .u.vlan_filtering = p->br->vlan_enabled,
1001 };
1002 struct net_bridge_vlan_group *vg;
1003 int ret = -ENOMEM;
1004
1005 vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
1006 if (!vg)
1007 goto out;
1008
1009 ret = switchdev_port_attr_set(p->dev, &attr);
1010 if (ret && ret != -EOPNOTSUPP)
1011 goto err_vlan_enabled;
1012
1013 ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
1014 if (ret)
1015 goto err_rhtbl;
1016 ret = vlan_tunnel_init(vg);
1017 if (ret)
1018 goto err_tunnel_init;
1019 INIT_LIST_HEAD(&vg->vlan_list);
1020 rcu_assign_pointer(p->vlgrp, vg);
1021 if (p->br->default_pvid) {
1022 bool changed;
1023
1024 ret = nbp_vlan_add(p, p->br->default_pvid,
1025 BRIDGE_VLAN_INFO_PVID |
1026 BRIDGE_VLAN_INFO_UNTAGGED,
1027 &changed);
1028 if (ret)
1029 goto err_vlan_add;
1030 }
1031 out:
1032 return ret;
1033
1034 err_vlan_add:
1035 RCU_INIT_POINTER(p->vlgrp, NULL);
1036 synchronize_rcu();
1037 vlan_tunnel_deinit(vg);
1038 err_tunnel_init:
1039 rhashtable_destroy(&vg->vlan_hash);
1040 err_rhtbl:
1041 err_vlan_enabled:
1042 kfree(vg);
1043
1044 goto out;
1045 }
1046
1047 /* Must be protected by RTNL.
1048 * Must be called with vid in range from 1 to 4094 inclusive.
1049 * changed must be true only if the vlan was created or updated
1050 */
1051 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1052 bool *changed)
1053 {
1054 struct switchdev_obj_port_vlan v = {
1055 .obj.orig_dev = port->dev,
1056 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1057 .flags = flags,
1058 .vid_begin = vid,
1059 .vid_end = vid,
1060 };
1061 struct net_bridge_vlan *vlan;
1062 int ret;
1063
1064 ASSERT_RTNL();
1065
1066 *changed = false;
1067 vlan = br_vlan_find(nbp_vlan_group(port), vid);
1068 if (vlan) {
1069 /* Pass the flags to the hardware bridge */
1070 ret = switchdev_port_obj_add(port->dev, &v.obj);
1071 if (ret && ret != -EOPNOTSUPP)
1072 return ret;
1073 *changed = __vlan_add_flags(vlan, flags);
1074
1075 return 0;
1076 }
1077
1078 vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1079 if (!vlan)
1080 return -ENOMEM;
1081
1082 vlan->vid = vid;
1083 vlan->port = port;
1084 ret = __vlan_add(vlan, flags);
1085 if (ret)
1086 kfree(vlan);
1087 else
1088 *changed = true;
1089
1090 return ret;
1091 }
1092
1093 /* Must be protected by RTNL.
1094 * Must be called with vid in range from 1 to 4094 inclusive.
1095 */
1096 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1097 {
1098 struct net_bridge_vlan *v;
1099
1100 ASSERT_RTNL();
1101
1102 v = br_vlan_find(nbp_vlan_group(port), vid);
1103 if (!v)
1104 return -ENOENT;
1105 br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1106 br_fdb_delete_by_port(port->br, port, vid, 0);
1107
1108 return __vlan_del(v);
1109 }
1110
1111 void nbp_vlan_flush(struct net_bridge_port *port)
1112 {
1113 struct net_bridge_vlan_group *vg;
1114
1115 ASSERT_RTNL();
1116
1117 vg = nbp_vlan_group(port);
1118 __vlan_flush(vg);
1119 RCU_INIT_POINTER(port->vlgrp, NULL);
1120 synchronize_rcu();
1121 __vlan_group_free(vg);
1122 }
1123
1124 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1125 struct br_vlan_stats *stats)
1126 {
1127 int i;
1128
1129 memset(stats, 0, sizeof(*stats));
1130 for_each_possible_cpu(i) {
1131 u64 rxpackets, rxbytes, txpackets, txbytes;
1132 struct br_vlan_stats *cpu_stats;
1133 unsigned int start;
1134
1135 cpu_stats = per_cpu_ptr(v->stats, i);
1136 do {
1137 start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1138 rxpackets = cpu_stats->rx_packets;
1139 rxbytes = cpu_stats->rx_bytes;
1140 txbytes = cpu_stats->tx_bytes;
1141 txpackets = cpu_stats->tx_packets;
1142 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1143
1144 stats->rx_packets += rxpackets;
1145 stats->rx_bytes += rxbytes;
1146 stats->tx_bytes += txbytes;
1147 stats->tx_packets += txpackets;
1148 }
1149 }
CRIS linux kernel tree