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TOMOYO Linux Cross Reference
Linux/net/bridge/br_vlan.c

Version: ~ [ linux-5.12 ] ~ [ linux-5.11.16 ] ~ [ linux-5.10.32 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.114 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.188 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.231 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.267 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.267 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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 void __vlan_add_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 36 {
 37         if (vg->pvid == vid)
 38                 return;
 39 
 40         smp_wmb();
 41         vg->pvid = vid;
 42 }
 43 
 44 static void __vlan_delete_pvid(struct net_bridge_vlan_group *vg, u16 vid)
 45 {
 46         if (vg->pvid != vid)
 47                 return;
 48 
 49         smp_wmb();
 50         vg->pvid = 0;
 51 }
 52 
 53 static void __vlan_add_flags(struct net_bridge_vlan *v, u16 flags)
 54 {
 55         struct net_bridge_vlan_group *vg;
 56 
 57         if (br_vlan_is_master(v))
 58                 vg = br_vlan_group(v->br);
 59         else
 60                 vg = nbp_vlan_group(v->port);
 61 
 62         if (flags & BRIDGE_VLAN_INFO_PVID)
 63                 __vlan_add_pvid(vg, v->vid);
 64         else
 65                 __vlan_delete_pvid(vg, v->vid);
 66 
 67         if (flags & BRIDGE_VLAN_INFO_UNTAGGED)
 68                 v->flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 69         else
 70                 v->flags &= ~BRIDGE_VLAN_INFO_UNTAGGED;
 71 }
 72 
 73 static int __vlan_vid_add(struct net_device *dev, struct net_bridge *br,
 74                           u16 vid, u16 flags)
 75 {
 76         struct switchdev_obj_port_vlan v = {
 77                 .obj.orig_dev = dev,
 78                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
 79                 .flags = flags,
 80                 .vid_begin = vid,
 81                 .vid_end = vid,
 82         };
 83         int err;
 84 
 85         /* Try switchdev op first. In case it is not supported, fallback to
 86          * 8021q add.
 87          */
 88         err = switchdev_port_obj_add(dev, &v.obj);
 89         if (err == -EOPNOTSUPP)
 90                 return vlan_vid_add(dev, br->vlan_proto, vid);
 91         return err;
 92 }
 93 
 94 static void __vlan_add_list(struct net_bridge_vlan *v)
 95 {
 96         struct net_bridge_vlan_group *vg;
 97         struct list_head *headp, *hpos;
 98         struct net_bridge_vlan *vent;
 99 
100         if (br_vlan_is_master(v))
101                 vg = br_vlan_group(v->br);
102         else
103                 vg = nbp_vlan_group(v->port);
104 
105         headp = &vg->vlan_list;
106         list_for_each_prev(hpos, headp) {
107                 vent = list_entry(hpos, struct net_bridge_vlan, vlist);
108                 if (v->vid < vent->vid)
109                         continue;
110                 else
111                         break;
112         }
113         list_add_rcu(&v->vlist, hpos);
114 }
115 
116 static void __vlan_del_list(struct net_bridge_vlan *v)
117 {
118         list_del_rcu(&v->vlist);
119 }
120 
121 static int __vlan_vid_del(struct net_device *dev, struct net_bridge *br,
122                           u16 vid)
123 {
124         struct switchdev_obj_port_vlan v = {
125                 .obj.orig_dev = dev,
126                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
127                 .vid_begin = vid,
128                 .vid_end = vid,
129         };
130         int err;
131 
132         /* Try switchdev op first. In case it is not supported, fallback to
133          * 8021q del.
134          */
135         err = switchdev_port_obj_del(dev, &v.obj);
136         if (err == -EOPNOTSUPP) {
137                 vlan_vid_del(dev, br->vlan_proto, vid);
138                 return 0;
139         }
140         return err;
141 }
142 
143 /* Returns a master vlan, if it didn't exist it gets created. In all cases a
144  * a reference is taken to the master vlan before returning.
145  */
146 static struct net_bridge_vlan *br_vlan_get_master(struct net_bridge *br, u16 vid)
147 {
148         struct net_bridge_vlan_group *vg;
149         struct net_bridge_vlan *masterv;
150 
151         vg = br_vlan_group(br);
152         masterv = br_vlan_find(vg, vid);
153         if (!masterv) {
154                 /* missing global ctx, create it now */
155                 if (br_vlan_add(br, vid, 0))
156                         return NULL;
157                 masterv = br_vlan_find(vg, vid);
158                 if (WARN_ON(!masterv))
159                         return NULL;
160         }
161         refcount_inc(&masterv->refcnt);
162 
163         return masterv;
164 }
165 
166 static void br_master_vlan_rcu_free(struct rcu_head *rcu)
167 {
168         struct net_bridge_vlan *v;
169 
170         v = container_of(rcu, struct net_bridge_vlan, rcu);
171         WARN_ON(!br_vlan_is_master(v));
172         free_percpu(v->stats);
173         v->stats = NULL;
174         kfree(v);
175 }
176 
177 static void br_vlan_put_master(struct net_bridge_vlan *masterv)
178 {
179         struct net_bridge_vlan_group *vg;
180 
181         if (!br_vlan_is_master(masterv))
182                 return;
183 
184         vg = br_vlan_group(masterv->br);
185         if (refcount_dec_and_test(&masterv->refcnt)) {
186                 rhashtable_remove_fast(&vg->vlan_hash,
187                                        &masterv->vnode, br_vlan_rht_params);
188                 __vlan_del_list(masterv);
189                 call_rcu(&masterv->rcu, br_master_vlan_rcu_free);
190         }
191 }
192 
193 /* This is the shared VLAN add function which works for both ports and bridge
194  * devices. There are four possible calls to this function in terms of the
195  * vlan entry type:
196  * 1. vlan is being added on a port (no master flags, global entry exists)
197  * 2. vlan is being added on a bridge (both master and brentry flags)
198  * 3. vlan is being added on a port, but a global entry didn't exist which
199  *    is being created right now (master flag set, brentry flag unset), the
200  *    global entry is used for global per-vlan features, but not for filtering
201  * 4. same as 3 but with both master and brentry flags set so the entry
202  *    will be used for filtering in both the port and the bridge
203  */
204 static int __vlan_add(struct net_bridge_vlan *v, u16 flags)
205 {
206         struct net_bridge_vlan *masterv = NULL;
207         struct net_bridge_port *p = NULL;
208         struct net_bridge_vlan_group *vg;
209         struct net_device *dev;
210         struct net_bridge *br;
211         int err;
212 
213         if (br_vlan_is_master(v)) {
214                 br = v->br;
215                 dev = br->dev;
216                 vg = br_vlan_group(br);
217         } else {
218                 p = v->port;
219                 br = p->br;
220                 dev = p->dev;
221                 vg = nbp_vlan_group(p);
222         }
223 
224         if (p) {
225                 /* Add VLAN to the device filter if it is supported.
226                  * This ensures tagged traffic enters the bridge when
227                  * promiscuous mode is disabled by br_manage_promisc().
228                  */
229                 err = __vlan_vid_add(dev, br, v->vid, flags);
230                 if (err)
231                         goto out;
232 
233                 /* need to work on the master vlan too */
234                 if (flags & BRIDGE_VLAN_INFO_MASTER) {
235                         err = br_vlan_add(br, v->vid, flags |
236                                                       BRIDGE_VLAN_INFO_BRENTRY);
237                         if (err)
238                                 goto out_filt;
239                 }
240 
241                 masterv = br_vlan_get_master(br, v->vid);
242                 if (!masterv)
243                         goto out_filt;
244                 v->brvlan = masterv;
245                 v->stats = masterv->stats;
246         }
247 
248         /* Add the dev mac and count the vlan only if it's usable */
249         if (br_vlan_should_use(v)) {
250                 err = br_fdb_insert(br, p, dev->dev_addr, v->vid);
251                 if (err) {
252                         br_err(br, "failed insert local address into bridge forwarding table\n");
253                         goto out_filt;
254                 }
255                 vg->num_vlans++;
256         }
257 
258         err = rhashtable_lookup_insert_fast(&vg->vlan_hash, &v->vnode,
259                                             br_vlan_rht_params);
260         if (err)
261                 goto out_fdb_insert;
262 
263         __vlan_add_list(v);
264         __vlan_add_flags(v, flags);
265 out:
266         return err;
267 
268 out_fdb_insert:
269         if (br_vlan_should_use(v)) {
270                 br_fdb_find_delete_local(br, p, dev->dev_addr, v->vid);
271                 vg->num_vlans--;
272         }
273 
274 out_filt:
275         if (p) {
276                 __vlan_vid_del(dev, br, v->vid);
277                 if (masterv) {
278                         br_vlan_put_master(masterv);
279                         v->brvlan = NULL;
280                 }
281         }
282 
283         goto out;
284 }
285 
286 static int __vlan_del(struct net_bridge_vlan *v)
287 {
288         struct net_bridge_vlan *masterv = v;
289         struct net_bridge_vlan_group *vg;
290         struct net_bridge_port *p = NULL;
291         int err = 0;
292 
293         if (br_vlan_is_master(v)) {
294                 vg = br_vlan_group(v->br);
295         } else {
296                 p = v->port;
297                 vg = nbp_vlan_group(v->port);
298                 masterv = v->brvlan;
299         }
300 
301         __vlan_delete_pvid(vg, v->vid);
302         if (p) {
303                 err = __vlan_vid_del(p->dev, p->br, v->vid);
304                 if (err)
305                         goto out;
306         }
307 
308         if (br_vlan_should_use(v)) {
309                 v->flags &= ~BRIDGE_VLAN_INFO_BRENTRY;
310                 vg->num_vlans--;
311         }
312 
313         if (masterv != v) {
314                 vlan_tunnel_info_del(vg, v);
315                 rhashtable_remove_fast(&vg->vlan_hash, &v->vnode,
316                                        br_vlan_rht_params);
317                 __vlan_del_list(v);
318                 kfree_rcu(v, rcu);
319         }
320 
321         br_vlan_put_master(masterv);
322 out:
323         return err;
324 }
325 
326 static void __vlan_group_free(struct net_bridge_vlan_group *vg)
327 {
328         WARN_ON(!list_empty(&vg->vlan_list));
329         rhashtable_destroy(&vg->vlan_hash);
330         vlan_tunnel_deinit(vg);
331         kfree(vg);
332 }
333 
334 static void __vlan_flush(struct net_bridge_vlan_group *vg)
335 {
336         struct net_bridge_vlan *vlan, *tmp;
337 
338         __vlan_delete_pvid(vg, vg->pvid);
339         list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist)
340                 __vlan_del(vlan);
341 }
342 
343 struct sk_buff *br_handle_vlan(struct net_bridge *br,
344                                const struct net_bridge_port *p,
345                                struct net_bridge_vlan_group *vg,
346                                struct sk_buff *skb)
347 {
348         struct br_vlan_stats *stats;
349         struct net_bridge_vlan *v;
350         u16 vid;
351 
352         /* If this packet was not filtered at input, let it pass */
353         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
354                 goto out;
355 
356         /* At this point, we know that the frame was filtered and contains
357          * a valid vlan id.  If the vlan id has untagged flag set,
358          * send untagged; otherwise, send tagged.
359          */
360         br_vlan_get_tag(skb, &vid);
361         v = br_vlan_find(vg, vid);
362         /* Vlan entry must be configured at this point.  The
363          * only exception is the bridge is set in promisc mode and the
364          * packet is destined for the bridge device.  In this case
365          * pass the packet as is.
366          */
367         if (!v || !br_vlan_should_use(v)) {
368                 if ((br->dev->flags & IFF_PROMISC) && skb->dev == br->dev) {
369                         goto out;
370                 } else {
371                         kfree_skb(skb);
372                         return NULL;
373                 }
374         }
375         if (br->vlan_stats_enabled) {
376                 stats = this_cpu_ptr(v->stats);
377                 u64_stats_update_begin(&stats->syncp);
378                 stats->tx_bytes += skb->len;
379                 stats->tx_packets++;
380                 u64_stats_update_end(&stats->syncp);
381         }
382 
383         if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
384                 skb->vlan_tci = 0;
385 
386         if (p && (p->flags & BR_VLAN_TUNNEL) &&
387             br_handle_egress_vlan_tunnel(skb, v)) {
388                 kfree_skb(skb);
389                 return NULL;
390         }
391 out:
392         return skb;
393 }
394 
395 /* Called under RCU */
396 static bool __allowed_ingress(const struct net_bridge *br,
397                               struct net_bridge_vlan_group *vg,
398                               struct sk_buff *skb, u16 *vid)
399 {
400         struct br_vlan_stats *stats;
401         struct net_bridge_vlan *v;
402         bool tagged;
403 
404         BR_INPUT_SKB_CB(skb)->vlan_filtered = true;
405         /* If vlan tx offload is disabled on bridge device and frame was
406          * sent from vlan device on the bridge device, it does not have
407          * HW accelerated vlan tag.
408          */
409         if (unlikely(!skb_vlan_tag_present(skb) &&
410                      skb->protocol == br->vlan_proto)) {
411                 skb = skb_vlan_untag(skb);
412                 if (unlikely(!skb))
413                         return false;
414         }
415 
416         if (!br_vlan_get_tag(skb, vid)) {
417                 /* Tagged frame */
418                 if (skb->vlan_proto != br->vlan_proto) {
419                         /* Protocol-mismatch, empty out vlan_tci for new tag */
420                         skb_push(skb, ETH_HLEN);
421                         skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto,
422                                                         skb_vlan_tag_get(skb));
423                         if (unlikely(!skb))
424                                 return false;
425 
426                         skb_pull(skb, ETH_HLEN);
427                         skb_reset_mac_len(skb);
428                         *vid = 0;
429                         tagged = false;
430                 } else {
431                         tagged = true;
432                 }
433         } else {
434                 /* Untagged frame */
435                 tagged = false;
436         }
437 
438         if (!*vid) {
439                 u16 pvid = br_get_pvid(vg);
440 
441                 /* Frame had a tag with VID 0 or did not have a tag.
442                  * See if pvid is set on this port.  That tells us which
443                  * vlan untagged or priority-tagged traffic belongs to.
444                  */
445                 if (!pvid)
446                         goto drop;
447 
448                 /* PVID is set on this port.  Any untagged or priority-tagged
449                  * ingress frame is considered to belong to this vlan.
450                  */
451                 *vid = pvid;
452                 if (likely(!tagged))
453                         /* Untagged Frame. */
454                         __vlan_hwaccel_put_tag(skb, br->vlan_proto, pvid);
455                 else
456                         /* Priority-tagged Frame.
457                          * At this point, We know that skb->vlan_tci had
458                          * VLAN_TAG_PRESENT bit and its VID field was 0x000.
459                          * We update only VID field and preserve PCP field.
460                          */
461                         skb->vlan_tci |= pvid;
462 
463                 /* if stats are disabled we can avoid the lookup */
464                 if (!br->vlan_stats_enabled)
465                         return true;
466         }
467         v = br_vlan_find(vg, *vid);
468         if (!v || !br_vlan_should_use(v))
469                 goto drop;
470 
471         if (br->vlan_stats_enabled) {
472                 stats = this_cpu_ptr(v->stats);
473                 u64_stats_update_begin(&stats->syncp);
474                 stats->rx_bytes += skb->len;
475                 stats->rx_packets++;
476                 u64_stats_update_end(&stats->syncp);
477         }
478 
479         return true;
480 
481 drop:
482         kfree_skb(skb);
483         return false;
484 }
485 
486 bool br_allowed_ingress(const struct net_bridge *br,
487                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
488                         u16 *vid)
489 {
490         /* If VLAN filtering is disabled on the bridge, all packets are
491          * permitted.
492          */
493         if (!br->vlan_enabled) {
494                 BR_INPUT_SKB_CB(skb)->vlan_filtered = false;
495                 return true;
496         }
497 
498         return __allowed_ingress(br, vg, skb, vid);
499 }
500 
501 /* Called under RCU. */
502 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
503                        const struct sk_buff *skb)
504 {
505         const struct net_bridge_vlan *v;
506         u16 vid;
507 
508         /* If this packet was not filtered at input, let it pass */
509         if (!BR_INPUT_SKB_CB(skb)->vlan_filtered)
510                 return true;
511 
512         br_vlan_get_tag(skb, &vid);
513         v = br_vlan_find(vg, vid);
514         if (v && br_vlan_should_use(v))
515                 return true;
516 
517         return false;
518 }
519 
520 /* Called under RCU */
521 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid)
522 {
523         struct net_bridge_vlan_group *vg;
524         struct net_bridge *br = p->br;
525 
526         /* If filtering was disabled at input, let it pass. */
527         if (!br->vlan_enabled)
528                 return true;
529 
530         vg = nbp_vlan_group_rcu(p);
531         if (!vg || !vg->num_vlans)
532                 return false;
533 
534         if (!br_vlan_get_tag(skb, vid) && skb->vlan_proto != br->vlan_proto)
535                 *vid = 0;
536 
537         if (!*vid) {
538                 *vid = br_get_pvid(vg);
539                 if (!*vid)
540                         return false;
541 
542                 return true;
543         }
544 
545         if (br_vlan_find(vg, *vid))
546                 return true;
547 
548         return false;
549 }
550 
551 /* Must be protected by RTNL.
552  * Must be called with vid in range from 1 to 4094 inclusive.
553  */
554 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
555 {
556         struct net_bridge_vlan_group *vg;
557         struct net_bridge_vlan *vlan;
558         int ret;
559 
560         ASSERT_RTNL();
561 
562         vg = br_vlan_group(br);
563         vlan = br_vlan_find(vg, vid);
564         if (vlan) {
565                 if (!br_vlan_is_brentry(vlan)) {
566                         /* Trying to change flags of non-existent bridge vlan */
567                         if (!(flags & BRIDGE_VLAN_INFO_BRENTRY))
568                                 return -EINVAL;
569                         /* It was only kept for port vlans, now make it real */
570                         ret = br_fdb_insert(br, NULL, br->dev->dev_addr,
571                                             vlan->vid);
572                         if (ret) {
573                                 br_err(br, "failed insert local address into bridge forwarding table\n");
574                                 return ret;
575                         }
576                         refcount_inc(&vlan->refcnt);
577                         vlan->flags |= BRIDGE_VLAN_INFO_BRENTRY;
578                         vg->num_vlans++;
579                 }
580                 __vlan_add_flags(vlan, flags);
581                 return 0;
582         }
583 
584         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
585         if (!vlan)
586                 return -ENOMEM;
587 
588         vlan->stats = netdev_alloc_pcpu_stats(struct br_vlan_stats);
589         if (!vlan->stats) {
590                 kfree(vlan);
591                 return -ENOMEM;
592         }
593         vlan->vid = vid;
594         vlan->flags = flags | BRIDGE_VLAN_INFO_MASTER;
595         vlan->flags &= ~BRIDGE_VLAN_INFO_PVID;
596         vlan->br = br;
597         if (flags & BRIDGE_VLAN_INFO_BRENTRY)
598                 refcount_set(&vlan->refcnt, 1);
599         ret = __vlan_add(vlan, flags);
600         if (ret) {
601                 free_percpu(vlan->stats);
602                 kfree(vlan);
603         }
604 
605         return ret;
606 }
607 
608 /* Must be protected by RTNL.
609  * Must be called with vid in range from 1 to 4094 inclusive.
610  */
611 int br_vlan_delete(struct net_bridge *br, u16 vid)
612 {
613         struct net_bridge_vlan_group *vg;
614         struct net_bridge_vlan *v;
615 
616         ASSERT_RTNL();
617 
618         vg = br_vlan_group(br);
619         v = br_vlan_find(vg, vid);
620         if (!v || !br_vlan_is_brentry(v))
621                 return -ENOENT;
622 
623         br_fdb_find_delete_local(br, NULL, br->dev->dev_addr, vid);
624         br_fdb_delete_by_port(br, NULL, vid, 0);
625 
626         vlan_tunnel_info_del(vg, v);
627 
628         return __vlan_del(v);
629 }
630 
631 void br_vlan_flush(struct net_bridge *br)
632 {
633         struct net_bridge_vlan_group *vg;
634 
635         ASSERT_RTNL();
636 
637         vg = br_vlan_group(br);
638         __vlan_flush(vg);
639         RCU_INIT_POINTER(br->vlgrp, NULL);
640         synchronize_rcu();
641         __vlan_group_free(vg);
642 }
643 
644 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid)
645 {
646         if (!vg)
647                 return NULL;
648 
649         return br_vlan_lookup(&vg->vlan_hash, vid);
650 }
651 
652 /* Must be protected by RTNL. */
653 static void recalculate_group_addr(struct net_bridge *br)
654 {
655         if (br->group_addr_set)
656                 return;
657 
658         spin_lock_bh(&br->lock);
659         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q)) {
660                 /* Bridge Group Address */
661                 br->group_addr[5] = 0x00;
662         } else { /* vlan_enabled && ETH_P_8021AD */
663                 /* Provider Bridge Group Address */
664                 br->group_addr[5] = 0x08;
665         }
666         spin_unlock_bh(&br->lock);
667 }
668 
669 /* Must be protected by RTNL. */
670 void br_recalculate_fwd_mask(struct net_bridge *br)
671 {
672         if (!br->vlan_enabled || br->vlan_proto == htons(ETH_P_8021Q))
673                 br->group_fwd_mask_required = BR_GROUPFWD_DEFAULT;
674         else /* vlan_enabled && ETH_P_8021AD */
675                 br->group_fwd_mask_required = BR_GROUPFWD_8021AD &
676                                               ~(1u << br->group_addr[5]);
677 }
678 
679 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
680 {
681         struct switchdev_attr attr = {
682                 .orig_dev = br->dev,
683                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
684                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
685                 .u.vlan_filtering = val,
686         };
687         int err;
688 
689         if (br->vlan_enabled == val)
690                 return 0;
691 
692         err = switchdev_port_attr_set(br->dev, &attr);
693         if (err && err != -EOPNOTSUPP)
694                 return err;
695 
696         br->vlan_enabled = val;
697         br_manage_promisc(br);
698         recalculate_group_addr(br);
699         br_recalculate_fwd_mask(br);
700 
701         return 0;
702 }
703 
704 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
705 {
706         return __br_vlan_filter_toggle(br, val);
707 }
708 
709 bool br_vlan_enabled(const struct net_device *dev)
710 {
711         struct net_bridge *br = netdev_priv(dev);
712 
713         return !!br->vlan_enabled;
714 }
715 EXPORT_SYMBOL_GPL(br_vlan_enabled);
716 
717 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto)
718 {
719         int err = 0;
720         struct net_bridge_port *p;
721         struct net_bridge_vlan *vlan;
722         struct net_bridge_vlan_group *vg;
723         __be16 oldproto;
724 
725         if (br->vlan_proto == proto)
726                 return 0;
727 
728         /* Add VLANs for the new proto to the device filter. */
729         list_for_each_entry(p, &br->port_list, list) {
730                 vg = nbp_vlan_group(p);
731                 list_for_each_entry(vlan, &vg->vlan_list, vlist) {
732                         err = vlan_vid_add(p->dev, proto, vlan->vid);
733                         if (err)
734                                 goto err_filt;
735                 }
736         }
737 
738         oldproto = br->vlan_proto;
739         br->vlan_proto = proto;
740 
741         recalculate_group_addr(br);
742         br_recalculate_fwd_mask(br);
743 
744         /* Delete VLANs for the old proto from the device filter. */
745         list_for_each_entry(p, &br->port_list, list) {
746                 vg = nbp_vlan_group(p);
747                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
748                         vlan_vid_del(p->dev, oldproto, vlan->vid);
749         }
750 
751         return 0;
752 
753 err_filt:
754         list_for_each_entry_continue_reverse(vlan, &vg->vlan_list, vlist)
755                 vlan_vid_del(p->dev, proto, vlan->vid);
756 
757         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
758                 vg = nbp_vlan_group(p);
759                 list_for_each_entry(vlan, &vg->vlan_list, vlist)
760                         vlan_vid_del(p->dev, proto, vlan->vid);
761         }
762 
763         return err;
764 }
765 
766 int br_vlan_set_proto(struct net_bridge *br, unsigned long val)
767 {
768         if (val != ETH_P_8021Q && val != ETH_P_8021AD)
769                 return -EPROTONOSUPPORT;
770 
771         return __br_vlan_set_proto(br, htons(val));
772 }
773 
774 int br_vlan_set_stats(struct net_bridge *br, unsigned long val)
775 {
776         switch (val) {
777         case 0:
778         case 1:
779                 br->vlan_stats_enabled = val;
780                 break;
781         default:
782                 return -EINVAL;
783         }
784 
785         return 0;
786 }
787 
788 static bool vlan_default_pvid(struct net_bridge_vlan_group *vg, u16 vid)
789 {
790         struct net_bridge_vlan *v;
791 
792         if (vid != vg->pvid)
793                 return false;
794 
795         v = br_vlan_lookup(&vg->vlan_hash, vid);
796         if (v && br_vlan_should_use(v) &&
797             (v->flags & BRIDGE_VLAN_INFO_UNTAGGED))
798                 return true;
799 
800         return false;
801 }
802 
803 static void br_vlan_disable_default_pvid(struct net_bridge *br)
804 {
805         struct net_bridge_port *p;
806         u16 pvid = br->default_pvid;
807 
808         /* Disable default_pvid on all ports where it is still
809          * configured.
810          */
811         if (vlan_default_pvid(br_vlan_group(br), pvid))
812                 br_vlan_delete(br, pvid);
813 
814         list_for_each_entry(p, &br->port_list, list) {
815                 if (vlan_default_pvid(nbp_vlan_group(p), pvid))
816                         nbp_vlan_delete(p, pvid);
817         }
818 
819         br->default_pvid = 0;
820 }
821 
822 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid)
823 {
824         const struct net_bridge_vlan *pvent;
825         struct net_bridge_vlan_group *vg;
826         struct net_bridge_port *p;
827         u16 old_pvid;
828         int err = 0;
829         unsigned long *changed;
830 
831         if (!pvid) {
832                 br_vlan_disable_default_pvid(br);
833                 return 0;
834         }
835 
836         changed = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long),
837                           GFP_KERNEL);
838         if (!changed)
839                 return -ENOMEM;
840 
841         old_pvid = br->default_pvid;
842 
843         /* Update default_pvid config only if we do not conflict with
844          * user configuration.
845          */
846         vg = br_vlan_group(br);
847         pvent = br_vlan_find(vg, pvid);
848         if ((!old_pvid || vlan_default_pvid(vg, old_pvid)) &&
849             (!pvent || !br_vlan_should_use(pvent))) {
850                 err = br_vlan_add(br, pvid,
851                                   BRIDGE_VLAN_INFO_PVID |
852                                   BRIDGE_VLAN_INFO_UNTAGGED |
853                                   BRIDGE_VLAN_INFO_BRENTRY);
854                 if (err)
855                         goto out;
856                 br_vlan_delete(br, old_pvid);
857                 set_bit(0, changed);
858         }
859 
860         list_for_each_entry(p, &br->port_list, list) {
861                 /* Update default_pvid config only if we do not conflict with
862                  * user configuration.
863                  */
864                 vg = nbp_vlan_group(p);
865                 if ((old_pvid &&
866                      !vlan_default_pvid(vg, old_pvid)) ||
867                     br_vlan_find(vg, pvid))
868                         continue;
869 
870                 err = nbp_vlan_add(p, pvid,
871                                    BRIDGE_VLAN_INFO_PVID |
872                                    BRIDGE_VLAN_INFO_UNTAGGED);
873                 if (err)
874                         goto err_port;
875                 nbp_vlan_delete(p, old_pvid);
876                 set_bit(p->port_no, changed);
877         }
878 
879         br->default_pvid = pvid;
880 
881 out:
882         kfree(changed);
883         return err;
884 
885 err_port:
886         list_for_each_entry_continue_reverse(p, &br->port_list, list) {
887                 if (!test_bit(p->port_no, changed))
888                         continue;
889 
890                 if (old_pvid)
891                         nbp_vlan_add(p, old_pvid,
892                                      BRIDGE_VLAN_INFO_PVID |
893                                      BRIDGE_VLAN_INFO_UNTAGGED);
894                 nbp_vlan_delete(p, pvid);
895         }
896 
897         if (test_bit(0, changed)) {
898                 if (old_pvid)
899                         br_vlan_add(br, old_pvid,
900                                     BRIDGE_VLAN_INFO_PVID |
901                                     BRIDGE_VLAN_INFO_UNTAGGED |
902                                     BRIDGE_VLAN_INFO_BRENTRY);
903                 br_vlan_delete(br, pvid);
904         }
905         goto out;
906 }
907 
908 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val)
909 {
910         u16 pvid = val;
911         int err = 0;
912 
913         if (val >= VLAN_VID_MASK)
914                 return -EINVAL;
915 
916         if (pvid == br->default_pvid)
917                 goto out;
918 
919         /* Only allow default pvid change when filtering is disabled */
920         if (br->vlan_enabled) {
921                 pr_info_once("Please disable vlan filtering to change default_pvid\n");
922                 err = -EPERM;
923                 goto out;
924         }
925         err = __br_vlan_set_default_pvid(br, pvid);
926 out:
927         return err;
928 }
929 
930 int br_vlan_init(struct net_bridge *br)
931 {
932         struct net_bridge_vlan_group *vg;
933         int ret = -ENOMEM;
934 
935         vg = kzalloc(sizeof(*vg), GFP_KERNEL);
936         if (!vg)
937                 goto out;
938         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
939         if (ret)
940                 goto err_rhtbl;
941         ret = vlan_tunnel_init(vg);
942         if (ret)
943                 goto err_tunnel_init;
944         INIT_LIST_HEAD(&vg->vlan_list);
945         br->vlan_proto = htons(ETH_P_8021Q);
946         br->default_pvid = 1;
947         rcu_assign_pointer(br->vlgrp, vg);
948         ret = br_vlan_add(br, 1,
949                           BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED |
950                           BRIDGE_VLAN_INFO_BRENTRY);
951         if (ret)
952                 goto err_vlan_add;
953 
954 out:
955         return ret;
956 
957 err_vlan_add:
958         vlan_tunnel_deinit(vg);
959 err_tunnel_init:
960         rhashtable_destroy(&vg->vlan_hash);
961 err_rhtbl:
962         kfree(vg);
963 
964         goto out;
965 }
966 
967 int nbp_vlan_init(struct net_bridge_port *p)
968 {
969         struct switchdev_attr attr = {
970                 .orig_dev = p->br->dev,
971                 .id = SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
972                 .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
973                 .u.vlan_filtering = p->br->vlan_enabled,
974         };
975         struct net_bridge_vlan_group *vg;
976         int ret = -ENOMEM;
977 
978         vg = kzalloc(sizeof(struct net_bridge_vlan_group), GFP_KERNEL);
979         if (!vg)
980                 goto out;
981 
982         ret = switchdev_port_attr_set(p->dev, &attr);
983         if (ret && ret != -EOPNOTSUPP)
984                 goto err_vlan_enabled;
985 
986         ret = rhashtable_init(&vg->vlan_hash, &br_vlan_rht_params);
987         if (ret)
988                 goto err_rhtbl;
989         ret = vlan_tunnel_init(vg);
990         if (ret)
991                 goto err_tunnel_init;
992         INIT_LIST_HEAD(&vg->vlan_list);
993         rcu_assign_pointer(p->vlgrp, vg);
994         if (p->br->default_pvid) {
995                 ret = nbp_vlan_add(p, p->br->default_pvid,
996                                    BRIDGE_VLAN_INFO_PVID |
997                                    BRIDGE_VLAN_INFO_UNTAGGED);
998                 if (ret)
999                         goto err_vlan_add;
1000         }
1001 out:
1002         return ret;
1003 
1004 err_vlan_add:
1005         RCU_INIT_POINTER(p->vlgrp, NULL);
1006         synchronize_rcu();
1007         vlan_tunnel_deinit(vg);
1008 err_tunnel_init:
1009         rhashtable_destroy(&vg->vlan_hash);
1010 err_rhtbl:
1011 err_vlan_enabled:
1012         kfree(vg);
1013 
1014         goto out;
1015 }
1016 
1017 /* Must be protected by RTNL.
1018  * Must be called with vid in range from 1 to 4094 inclusive.
1019  */
1020 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
1021 {
1022         struct switchdev_obj_port_vlan v = {
1023                 .obj.orig_dev = port->dev,
1024                 .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1025                 .flags = flags,
1026                 .vid_begin = vid,
1027                 .vid_end = vid,
1028         };
1029         struct net_bridge_vlan *vlan;
1030         int ret;
1031 
1032         ASSERT_RTNL();
1033 
1034         vlan = br_vlan_find(nbp_vlan_group(port), vid);
1035         if (vlan) {
1036                 /* Pass the flags to the hardware bridge */
1037                 ret = switchdev_port_obj_add(port->dev, &v.obj);
1038                 if (ret && ret != -EOPNOTSUPP)
1039                         return ret;
1040                 __vlan_add_flags(vlan, flags);
1041                 return 0;
1042         }
1043 
1044         vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
1045         if (!vlan)
1046                 return -ENOMEM;
1047 
1048         vlan->vid = vid;
1049         vlan->port = port;
1050         ret = __vlan_add(vlan, flags);
1051         if (ret)
1052                 kfree(vlan);
1053 
1054         return ret;
1055 }
1056 
1057 /* Must be protected by RTNL.
1058  * Must be called with vid in range from 1 to 4094 inclusive.
1059  */
1060 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1061 {
1062         struct net_bridge_vlan *v;
1063 
1064         ASSERT_RTNL();
1065 
1066         v = br_vlan_find(nbp_vlan_group(port), vid);
1067         if (!v)
1068                 return -ENOENT;
1069         br_fdb_find_delete_local(port->br, port, port->dev->dev_addr, vid);
1070         br_fdb_delete_by_port(port->br, port, vid, 0);
1071 
1072         return __vlan_del(v);
1073 }
1074 
1075 void nbp_vlan_flush(struct net_bridge_port *port)
1076 {
1077         struct net_bridge_vlan_group *vg;
1078 
1079         ASSERT_RTNL();
1080 
1081         vg = nbp_vlan_group(port);
1082         __vlan_flush(vg);
1083         RCU_INIT_POINTER(port->vlgrp, NULL);
1084         synchronize_rcu();
1085         __vlan_group_free(vg);
1086 }
1087 
1088 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1089                        struct br_vlan_stats *stats)
1090 {
1091         int i;
1092 
1093         memset(stats, 0, sizeof(*stats));
1094         for_each_possible_cpu(i) {
1095                 u64 rxpackets, rxbytes, txpackets, txbytes;
1096                 struct br_vlan_stats *cpu_stats;
1097                 unsigned int start;
1098 
1099                 cpu_stats = per_cpu_ptr(v->stats, i);
1100                 do {
1101                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
1102                         rxpackets = cpu_stats->rx_packets;
1103                         rxbytes = cpu_stats->rx_bytes;
1104                         txbytes = cpu_stats->tx_bytes;
1105                         txpackets = cpu_stats->tx_packets;
1106                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
1107 
1108                 stats->rx_packets += rxpackets;
1109                 stats->rx_bytes += rxbytes;
1110                 stats->tx_bytes += txbytes;
1111                 stats->tx_packets += txpackets;
1112         }
1113 }
1114 

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