~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 
  9 static 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 
 18 static 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 
 29 static 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 
 34 static 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 
 43 static 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 
 52 static 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 
 72 static 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 
 93 static 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 
115 static void __vlan_del_list(struct net_bridge_vlan *v)
116 {
117         list_del_rcu(&v->vlist);
118 }
119 
120 static 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  */
145 static 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 
165 static 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  */
192 static 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);
252 out:
253         return err;
254 
255 out_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 
261 out_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 
273 static 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);
308 out:
309         return err;
310 }
311 
312 static 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 
319 static 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 
328 struct 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 
361 out:
362         return skb;
363 }
364 
365 /* Called under RCU */
366 static 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;
438 drop:
439         kfree_skb(skb);
440         return false;
441 }
442 
443 bool 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. */
459 bool 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 */
478 bool 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  */
511 int 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  */
561 int 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 
579 void 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 
592 struct 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. */
601 static 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. */
618 void 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 
627 int __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 
652 int 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 
665 int __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 
701 err_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 
714 int 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 
730 static 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 
745 static 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 
764 int __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 
823 out:
824         kfree(changed);
825         return err;
826 
827 err_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 
850 int 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);
871 unlock:
872         rtnl_unlock();
873         return err;
874 }
875 
876 int 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 
897 out:
898         return ret;
899 
900 err_vlan_add:
901         rhashtable_destroy(&vg->vlan_hash);
902 err_rhtbl:
903         kfree(vg);
904 
905         goto out;
906 }
907 
908 int 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         }
939 out:
940         return ret;
941 
942 err_vlan_add:
943         RCU_INIT_POINTER(p->vlgrp, NULL);
944         synchronize_rcu();
945         rhashtable_destroy(&vg->vlan_hash);
946 err_vlan_enabled:
947 err_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  */
956 int 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  */
996 int 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 
1011 void 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 }
1023 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp