1 #include <linux/err.h>
2 #include <linux/igmp.h>
3 #include <linux/kernel.h>
4 #include <linux/netdevice.h>
5 #include <linux/rculist.h>
6 #include <linux/skbuff.h>
7 #include <linux/if_ether.h>
8 #include <net/ip.h>
9 #include <net/netlink.h>
10 #include <net/switchdev.h>
11 #if IS_ENABLED(CONFIG_IPV6)
12 #include <net/ipv6.h>
13 #include <net/addrconf.h>
14 #endif
15
16 #include "br_private.h"
17
br_rports_fill_info(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev)18 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
19 struct net_device *dev)
20 {
21 struct net_bridge *br = netdev_priv(dev);
22 struct net_bridge_port *p;
23 struct nlattr *nest, *port_nest;
24
25 if (!br->multicast_router || hlist_empty(&br->router_list))
26 return 0;
27
28 nest = nla_nest_start(skb, MDBA_ROUTER);
29 if (nest == NULL)
30 return -EMSGSIZE;
31
32 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
33 if (!p)
34 continue;
35 port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
36 if (!port_nest)
37 goto fail;
38 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
39 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
40 br_timer_value(&p->multicast_router_timer)) ||
41 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
42 p->multicast_router)) {
43 nla_nest_cancel(skb, port_nest);
44 goto fail;
45 }
46 nla_nest_end(skb, port_nest);
47 }
48
49 nla_nest_end(skb, nest);
50 return 0;
51 fail:
52 nla_nest_cancel(skb, nest);
53 return -EMSGSIZE;
54 }
55
__mdb_entry_fill_flags(struct br_mdb_entry * e,unsigned char flags)56 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
57 {
58 e->state = flags & MDB_PG_FLAGS_PERMANENT;
59 e->flags = 0;
60 if (flags & MDB_PG_FLAGS_OFFLOAD)
61 e->flags |= MDB_FLAGS_OFFLOAD;
62 }
63
__mdb_entry_to_br_ip(struct br_mdb_entry * entry,struct br_ip * ip)64 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
65 {
66 memset(ip, 0, sizeof(struct br_ip));
67 ip->vid = entry->vid;
68 ip->proto = entry->addr.proto;
69 if (ip->proto == htons(ETH_P_IP))
70 ip->u.ip4 = entry->addr.u.ip4;
71 #if IS_ENABLED(CONFIG_IPV6)
72 else
73 ip->u.ip6 = entry->addr.u.ip6;
74 #endif
75 }
76
br_mdb_fill_info(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev)77 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
78 struct net_device *dev)
79 {
80 struct net_bridge *br = netdev_priv(dev);
81 struct net_bridge_mdb_htable *mdb;
82 struct nlattr *nest, *nest2;
83 int i, err = 0;
84 int idx = 0, s_idx = cb->args[1];
85
86 if (br->multicast_disabled)
87 return 0;
88
89 mdb = rcu_dereference(br->mdb);
90 if (!mdb)
91 return 0;
92
93 nest = nla_nest_start(skb, MDBA_MDB);
94 if (nest == NULL)
95 return -EMSGSIZE;
96
97 for (i = 0; i < mdb->max; i++) {
98 struct net_bridge_mdb_entry *mp;
99 struct net_bridge_port_group *p;
100 struct net_bridge_port_group __rcu **pp;
101 struct net_bridge_port *port;
102
103 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
104 if (idx < s_idx)
105 goto skip;
106
107 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
108 if (nest2 == NULL) {
109 err = -EMSGSIZE;
110 goto out;
111 }
112
113 for (pp = &mp->ports;
114 (p = rcu_dereference(*pp)) != NULL;
115 pp = &p->next) {
116 struct nlattr *nest_ent;
117 struct br_mdb_entry e;
118
119 port = p->port;
120 if (!port)
121 continue;
122
123 memset(&e, 0, sizeof(e));
124 e.ifindex = port->dev->ifindex;
125 e.vid = p->addr.vid;
126 __mdb_entry_fill_flags(&e, p->flags);
127 if (p->addr.proto == htons(ETH_P_IP))
128 e.addr.u.ip4 = p->addr.u.ip4;
129 #if IS_ENABLED(CONFIG_IPV6)
130 if (p->addr.proto == htons(ETH_P_IPV6))
131 e.addr.u.ip6 = p->addr.u.ip6;
132 #endif
133 e.addr.proto = p->addr.proto;
134 nest_ent = nla_nest_start(skb,
135 MDBA_MDB_ENTRY_INFO);
136 if (!nest_ent) {
137 nla_nest_cancel(skb, nest2);
138 err = -EMSGSIZE;
139 goto out;
140 }
141 if (nla_put_nohdr(skb, sizeof(e), &e) ||
142 nla_put_u32(skb,
143 MDBA_MDB_EATTR_TIMER,
144 br_timer_value(&p->timer))) {
145 nla_nest_cancel(skb, nest_ent);
146 nla_nest_cancel(skb, nest2);
147 err = -EMSGSIZE;
148 goto out;
149 }
150 nla_nest_end(skb, nest_ent);
151 }
152 nla_nest_end(skb, nest2);
153 skip:
154 idx++;
155 }
156 }
157
158 out:
159 cb->args[1] = idx;
160 nla_nest_end(skb, nest);
161 return err;
162 }
163
br_mdb_dump(struct sk_buff * skb,struct netlink_callback * cb)164 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
165 {
166 struct net_device *dev;
167 struct net *net = sock_net(skb->sk);
168 struct nlmsghdr *nlh = NULL;
169 int idx = 0, s_idx;
170
171 s_idx = cb->args[0];
172
173 rcu_read_lock();
174
175 /* In theory this could be wrapped to 0... */
176 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
177
178 for_each_netdev_rcu(net, dev) {
179 if (dev->priv_flags & IFF_EBRIDGE) {
180 struct br_port_msg *bpm;
181
182 if (idx < s_idx)
183 goto skip;
184
185 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
186 cb->nlh->nlmsg_seq, RTM_GETMDB,
187 sizeof(*bpm), NLM_F_MULTI);
188 if (nlh == NULL)
189 break;
190
191 bpm = nlmsg_data(nlh);
192 memset(bpm, 0, sizeof(*bpm));
193 bpm->ifindex = dev->ifindex;
194 if (br_mdb_fill_info(skb, cb, dev) < 0)
195 goto out;
196 if (br_rports_fill_info(skb, cb, dev) < 0)
197 goto out;
198
199 cb->args[1] = 0;
200 nlmsg_end(skb, nlh);
201 skip:
202 idx++;
203 }
204 }
205
206 out:
207 if (nlh)
208 nlmsg_end(skb, nlh);
209 rcu_read_unlock();
210 cb->args[0] = idx;
211 return skb->len;
212 }
213
nlmsg_populate_mdb_fill(struct sk_buff * skb,struct net_device * dev,struct br_mdb_entry * entry,u32 pid,u32 seq,int type,unsigned int flags)214 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
215 struct net_device *dev,
216 struct br_mdb_entry *entry, u32 pid,
217 u32 seq, int type, unsigned int flags)
218 {
219 struct nlmsghdr *nlh;
220 struct br_port_msg *bpm;
221 struct nlattr *nest, *nest2;
222
223 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
224 if (!nlh)
225 return -EMSGSIZE;
226
227 bpm = nlmsg_data(nlh);
228 memset(bpm, 0, sizeof(*bpm));
229 bpm->family = AF_BRIDGE;
230 bpm->ifindex = dev->ifindex;
231 nest = nla_nest_start(skb, MDBA_MDB);
232 if (nest == NULL)
233 goto cancel;
234 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
235 if (nest2 == NULL)
236 goto end;
237
238 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
239 goto end;
240
241 nla_nest_end(skb, nest2);
242 nla_nest_end(skb, nest);
243 nlmsg_end(skb, nlh);
244 return 0;
245
246 end:
247 nla_nest_end(skb, nest);
248 cancel:
249 nlmsg_cancel(skb, nlh);
250 return -EMSGSIZE;
251 }
252
rtnl_mdb_nlmsg_size(void)253 static inline size_t rtnl_mdb_nlmsg_size(void)
254 {
255 return NLMSG_ALIGN(sizeof(struct br_port_msg))
256 + nla_total_size(sizeof(struct br_mdb_entry));
257 }
258
259 struct br_mdb_complete_info {
260 struct net_bridge_port *port;
261 struct br_ip ip;
262 };
263
br_mdb_complete(struct net_device * dev,int err,void * priv)264 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
265 {
266 struct br_mdb_complete_info *data = priv;
267 struct net_bridge_port_group __rcu **pp;
268 struct net_bridge_port_group *p;
269 struct net_bridge_mdb_htable *mdb;
270 struct net_bridge_mdb_entry *mp;
271 struct net_bridge_port *port = data->port;
272 struct net_bridge *br = port->br;
273
274 if (err)
275 goto err;
276
277 spin_lock_bh(&br->multicast_lock);
278 mdb = mlock_dereference(br->mdb, br);
279 mp = br_mdb_ip_get(mdb, &data->ip);
280 if (!mp)
281 goto out;
282 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
283 pp = &p->next) {
284 if (p->port != port)
285 continue;
286 p->flags |= MDB_PG_FLAGS_OFFLOAD;
287 }
288 out:
289 spin_unlock_bh(&br->multicast_lock);
290 err:
291 kfree(priv);
292 }
293
__br_mdb_notify(struct net_device * dev,struct net_bridge_port * p,struct br_mdb_entry * entry,int type)294 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
295 struct br_mdb_entry *entry, int type)
296 {
297 struct br_mdb_complete_info *complete_info;
298 struct switchdev_obj_port_mdb mdb = {
299 .obj = {
300 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
301 .flags = SWITCHDEV_F_DEFER,
302 },
303 .vid = entry->vid,
304 };
305 struct net_device *port_dev;
306 struct net *net = dev_net(dev);
307 struct sk_buff *skb;
308 int err = -ENOBUFS;
309
310 port_dev = __dev_get_by_index(net, entry->ifindex);
311 if (entry->addr.proto == htons(ETH_P_IP))
312 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
313 #if IS_ENABLED(CONFIG_IPV6)
314 else
315 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
316 #endif
317
318 mdb.obj.orig_dev = port_dev;
319 if (port_dev && type == RTM_NEWMDB) {
320 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
321 if (complete_info) {
322 complete_info->port = p;
323 __mdb_entry_to_br_ip(entry, &complete_info->ip);
324 mdb.obj.complete_priv = complete_info;
325 mdb.obj.complete = br_mdb_complete;
326 if (switchdev_port_obj_add(port_dev, &mdb.obj))
327 kfree(complete_info);
328 }
329 } else if (port_dev && type == RTM_DELMDB) {
330 switchdev_port_obj_del(port_dev, &mdb.obj);
331 }
332
333 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
334 if (!skb)
335 goto errout;
336
337 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
338 if (err < 0) {
339 kfree_skb(skb);
340 goto errout;
341 }
342
343 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
344 return;
345 errout:
346 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
347 }
348
br_mdb_notify(struct net_device * dev,struct net_bridge_port * port,struct br_ip * group,int type,u8 flags)349 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
350 struct br_ip *group, int type, u8 flags)
351 {
352 struct br_mdb_entry entry;
353
354 memset(&entry, 0, sizeof(entry));
355 entry.ifindex = port->dev->ifindex;
356 entry.addr.proto = group->proto;
357 entry.addr.u.ip4 = group->u.ip4;
358 #if IS_ENABLED(CONFIG_IPV6)
359 entry.addr.u.ip6 = group->u.ip6;
360 #endif
361 entry.vid = group->vid;
362 __mdb_entry_fill_flags(&entry, flags);
363 __br_mdb_notify(dev, port, &entry, type);
364 }
365
nlmsg_populate_rtr_fill(struct sk_buff * skb,struct net_device * dev,int ifindex,u32 pid,u32 seq,int type,unsigned int flags)366 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
367 struct net_device *dev,
368 int ifindex, u32 pid,
369 u32 seq, int type, unsigned int flags)
370 {
371 struct br_port_msg *bpm;
372 struct nlmsghdr *nlh;
373 struct nlattr *nest;
374
375 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
376 if (!nlh)
377 return -EMSGSIZE;
378
379 bpm = nlmsg_data(nlh);
380 memset(bpm, 0, sizeof(*bpm));
381 bpm->family = AF_BRIDGE;
382 bpm->ifindex = dev->ifindex;
383 nest = nla_nest_start(skb, MDBA_ROUTER);
384 if (!nest)
385 goto cancel;
386
387 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
388 goto end;
389
390 nla_nest_end(skb, nest);
391 nlmsg_end(skb, nlh);
392 return 0;
393
394 end:
395 nla_nest_end(skb, nest);
396 cancel:
397 nlmsg_cancel(skb, nlh);
398 return -EMSGSIZE;
399 }
400
rtnl_rtr_nlmsg_size(void)401 static inline size_t rtnl_rtr_nlmsg_size(void)
402 {
403 return NLMSG_ALIGN(sizeof(struct br_port_msg))
404 + nla_total_size(sizeof(__u32));
405 }
406
br_rtr_notify(struct net_device * dev,struct net_bridge_port * port,int type)407 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
408 int type)
409 {
410 struct net *net = dev_net(dev);
411 struct sk_buff *skb;
412 int err = -ENOBUFS;
413 int ifindex;
414
415 ifindex = port ? port->dev->ifindex : 0;
416 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
417 if (!skb)
418 goto errout;
419
420 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
421 if (err < 0) {
422 kfree_skb(skb);
423 goto errout;
424 }
425
426 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
427 return;
428
429 errout:
430 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
431 }
432
is_valid_mdb_entry(struct br_mdb_entry * entry)433 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
434 {
435 if (entry->ifindex == 0)
436 return false;
437
438 if (entry->addr.proto == htons(ETH_P_IP)) {
439 if (!ipv4_is_multicast(entry->addr.u.ip4))
440 return false;
441 if (ipv4_is_local_multicast(entry->addr.u.ip4))
442 return false;
443 #if IS_ENABLED(CONFIG_IPV6)
444 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
445 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
446 return false;
447 #endif
448 } else
449 return false;
450 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
451 return false;
452 if (entry->vid >= VLAN_VID_MASK)
453 return false;
454
455 return true;
456 }
457
br_mdb_parse(struct sk_buff * skb,struct nlmsghdr * nlh,struct net_device ** pdev,struct br_mdb_entry ** pentry)458 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
459 struct net_device **pdev, struct br_mdb_entry **pentry)
460 {
461 struct net *net = sock_net(skb->sk);
462 struct br_mdb_entry *entry;
463 struct br_port_msg *bpm;
464 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
465 struct net_device *dev;
466 int err;
467
468 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
469 if (err < 0)
470 return err;
471
472 bpm = nlmsg_data(nlh);
473 if (bpm->ifindex == 0) {
474 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
475 return -EINVAL;
476 }
477
478 dev = __dev_get_by_index(net, bpm->ifindex);
479 if (dev == NULL) {
480 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
481 return -ENODEV;
482 }
483
484 if (!(dev->priv_flags & IFF_EBRIDGE)) {
485 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
486 return -EOPNOTSUPP;
487 }
488
489 *pdev = dev;
490
491 if (!tb[MDBA_SET_ENTRY] ||
492 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
493 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
494 return -EINVAL;
495 }
496
497 entry = nla_data(tb[MDBA_SET_ENTRY]);
498 if (!is_valid_mdb_entry(entry)) {
499 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
500 return -EINVAL;
501 }
502
503 *pentry = entry;
504 return 0;
505 }
506
br_mdb_add_group(struct net_bridge * br,struct net_bridge_port * port,struct br_ip * group,unsigned char state)507 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
508 struct br_ip *group, unsigned char state)
509 {
510 struct net_bridge_mdb_entry *mp;
511 struct net_bridge_port_group *p;
512 struct net_bridge_port_group __rcu **pp;
513 struct net_bridge_mdb_htable *mdb;
514 unsigned long now = jiffies;
515 int err;
516
517 mdb = mlock_dereference(br->mdb, br);
518 mp = br_mdb_ip_get(mdb, group);
519 if (!mp) {
520 mp = br_multicast_new_group(br, port, group);
521 err = PTR_ERR_OR_ZERO(mp);
522 if (err)
523 return err;
524 }
525
526 for (pp = &mp->ports;
527 (p = mlock_dereference(*pp, br)) != NULL;
528 pp = &p->next) {
529 if (p->port == port)
530 return -EEXIST;
531 if ((unsigned long)p->port < (unsigned long)port)
532 break;
533 }
534
535 p = br_multicast_new_port_group(port, group, *pp, state);
536 if (unlikely(!p))
537 return -ENOMEM;
538 rcu_assign_pointer(*pp, p);
539 if (state == MDB_TEMPORARY)
540 mod_timer(&p->timer, now + br->multicast_membership_interval);
541
542 return 0;
543 }
544
__br_mdb_add(struct net * net,struct net_bridge * br,struct br_mdb_entry * entry)545 static int __br_mdb_add(struct net *net, struct net_bridge *br,
546 struct br_mdb_entry *entry)
547 {
548 struct br_ip ip;
549 struct net_device *dev;
550 struct net_bridge_port *p;
551 int ret;
552
553 if (!netif_running(br->dev) || br->multicast_disabled)
554 return -EINVAL;
555
556 dev = __dev_get_by_index(net, entry->ifindex);
557 if (!dev)
558 return -ENODEV;
559
560 p = br_port_get_rtnl(dev);
561 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
562 return -EINVAL;
563
564 __mdb_entry_to_br_ip(entry, &ip);
565
566 spin_lock_bh(&br->multicast_lock);
567 ret = br_mdb_add_group(br, p, &ip, entry->state);
568 spin_unlock_bh(&br->multicast_lock);
569 return ret;
570 }
571
br_mdb_add(struct sk_buff * skb,struct nlmsghdr * nlh)572 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
573 {
574 struct net *net = sock_net(skb->sk);
575 struct net_bridge_vlan_group *vg;
576 struct net_device *dev, *pdev;
577 struct br_mdb_entry *entry;
578 struct net_bridge_port *p;
579 struct net_bridge_vlan *v;
580 struct net_bridge *br;
581 int err;
582
583 err = br_mdb_parse(skb, nlh, &dev, &entry);
584 if (err < 0)
585 return err;
586
587 br = netdev_priv(dev);
588
589 /* If vlan filtering is enabled and VLAN is not specified
590 * install mdb entry on all vlans configured on the port.
591 */
592 pdev = __dev_get_by_index(net, entry->ifindex);
593 if (!pdev)
594 return -ENODEV;
595
596 p = br_port_get_rtnl(pdev);
597 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
598 return -EINVAL;
599
600 vg = nbp_vlan_group(p);
601 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
602 list_for_each_entry(v, &vg->vlan_list, vlist) {
603 entry->vid = v->vid;
604 err = __br_mdb_add(net, br, entry);
605 if (err)
606 break;
607 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
608 }
609 } else {
610 err = __br_mdb_add(net, br, entry);
611 if (!err)
612 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
613 }
614
615 return err;
616 }
617
__br_mdb_del(struct net_bridge * br,struct br_mdb_entry * entry)618 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
619 {
620 struct net_bridge_mdb_htable *mdb;
621 struct net_bridge_mdb_entry *mp;
622 struct net_bridge_port_group *p;
623 struct net_bridge_port_group __rcu **pp;
624 struct br_ip ip;
625 int err = -EINVAL;
626
627 if (!netif_running(br->dev) || br->multicast_disabled)
628 return -EINVAL;
629
630 __mdb_entry_to_br_ip(entry, &ip);
631
632 spin_lock_bh(&br->multicast_lock);
633 mdb = mlock_dereference(br->mdb, br);
634
635 mp = br_mdb_ip_get(mdb, &ip);
636 if (!mp)
637 goto unlock;
638
639 for (pp = &mp->ports;
640 (p = mlock_dereference(*pp, br)) != NULL;
641 pp = &p->next) {
642 if (!p->port || p->port->dev->ifindex != entry->ifindex)
643 continue;
644
645 if (p->port->state == BR_STATE_DISABLED)
646 goto unlock;
647
648 __mdb_entry_fill_flags(entry, p->flags);
649 rcu_assign_pointer(*pp, p->next);
650 hlist_del_init(&p->mglist);
651 del_timer(&p->timer);
652 call_rcu_bh(&p->rcu, br_multicast_free_pg);
653 err = 0;
654
655 if (!mp->ports && !mp->mglist &&
656 netif_running(br->dev))
657 mod_timer(&mp->timer, jiffies);
658 break;
659 }
660
661 unlock:
662 spin_unlock_bh(&br->multicast_lock);
663 return err;
664 }
665
br_mdb_del(struct sk_buff * skb,struct nlmsghdr * nlh)666 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
667 {
668 struct net *net = sock_net(skb->sk);
669 struct net_bridge_vlan_group *vg;
670 struct net_device *dev, *pdev;
671 struct br_mdb_entry *entry;
672 struct net_bridge_port *p;
673 struct net_bridge_vlan *v;
674 struct net_bridge *br;
675 int err;
676
677 err = br_mdb_parse(skb, nlh, &dev, &entry);
678 if (err < 0)
679 return err;
680
681 br = netdev_priv(dev);
682
683 /* If vlan filtering is enabled and VLAN is not specified
684 * delete mdb entry on all vlans configured on the port.
685 */
686 pdev = __dev_get_by_index(net, entry->ifindex);
687 if (!pdev)
688 return -ENODEV;
689
690 p = br_port_get_rtnl(pdev);
691 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
692 return -EINVAL;
693
694 vg = nbp_vlan_group(p);
695 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
696 list_for_each_entry(v, &vg->vlan_list, vlist) {
697 entry->vid = v->vid;
698 err = __br_mdb_del(br, entry);
699 if (!err)
700 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
701 }
702 } else {
703 err = __br_mdb_del(br, entry);
704 if (!err)
705 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
706 }
707
708 return err;
709 }
710
br_mdb_init(void)711 void br_mdb_init(void)
712 {
713 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
714 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
715 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
716 }
717
br_mdb_uninit(void)718 void br_mdb_uninit(void)
719 {
720 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
721 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
722 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
723 }
724