1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/err.h>
3 #include <linux/igmp.h>
4 #include <linux/kernel.h>
5 #include <linux/netdevice.h>
6 #include <linux/rculist.h>
7 #include <linux/skbuff.h>
8 #include <linux/if_ether.h>
9 #include <net/ip.h>
10 #include <net/netlink.h>
11 #include <net/switchdev.h>
12 #if IS_ENABLED(CONFIG_IPV6)
13 #include <net/ipv6.h>
14 #include <net/addrconf.h>
15 #endif
16
17 #include "br_private.h"
18
br_rports_fill_info(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev)19 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
20 struct net_device *dev)
21 {
22 struct net_bridge *br = netdev_priv(dev);
23 struct net_bridge_port *p;
24 struct nlattr *nest, *port_nest;
25
26 if (!br->multicast_router || hlist_empty(&br->router_list))
27 return 0;
28
29 nest = nla_nest_start(skb, MDBA_ROUTER);
30 if (nest == NULL)
31 return -EMSGSIZE;
32
33 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
34 if (!p)
35 continue;
36 port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
37 if (!port_nest)
38 goto fail;
39 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
40 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
41 br_timer_value(&p->multicast_router_timer)) ||
42 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
43 p->multicast_router)) {
44 nla_nest_cancel(skb, port_nest);
45 goto fail;
46 }
47 nla_nest_end(skb, port_nest);
48 }
49
50 nla_nest_end(skb, nest);
51 return 0;
52 fail:
53 nla_nest_cancel(skb, nest);
54 return -EMSGSIZE;
55 }
56
__mdb_entry_fill_flags(struct br_mdb_entry * e,unsigned char flags)57 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
58 {
59 e->state = flags & MDB_PG_FLAGS_PERMANENT;
60 e->flags = 0;
61 if (flags & MDB_PG_FLAGS_OFFLOAD)
62 e->flags |= MDB_FLAGS_OFFLOAD;
63 }
64
__mdb_entry_to_br_ip(struct br_mdb_entry * entry,struct br_ip * ip)65 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
66 {
67 memset(ip, 0, sizeof(struct br_ip));
68 ip->vid = entry->vid;
69 ip->proto = entry->addr.proto;
70 if (ip->proto == htons(ETH_P_IP))
71 ip->u.ip4 = entry->addr.u.ip4;
72 #if IS_ENABLED(CONFIG_IPV6)
73 else
74 ip->u.ip6 = entry->addr.u.ip6;
75 #endif
76 }
77
br_mdb_fill_info(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev)78 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
79 struct net_device *dev)
80 {
81 struct net_bridge *br = netdev_priv(dev);
82 struct net_bridge_mdb_htable *mdb;
83 struct nlattr *nest, *nest2;
84 int i, err = 0;
85 int idx = 0, s_idx = cb->args[1];
86
87 if (br->multicast_disabled)
88 return 0;
89
90 mdb = rcu_dereference(br->mdb);
91 if (!mdb)
92 return 0;
93
94 nest = nla_nest_start(skb, MDBA_MDB);
95 if (nest == NULL)
96 return -EMSGSIZE;
97
98 for (i = 0; i < mdb->max; i++) {
99 struct net_bridge_mdb_entry *mp;
100 struct net_bridge_port_group *p;
101 struct net_bridge_port_group __rcu **pp;
102 struct net_bridge_port *port;
103
104 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
105 if (idx < s_idx)
106 goto skip;
107
108 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
109 if (nest2 == NULL) {
110 err = -EMSGSIZE;
111 goto out;
112 }
113
114 for (pp = &mp->ports;
115 (p = rcu_dereference(*pp)) != NULL;
116 pp = &p->next) {
117 struct nlattr *nest_ent;
118 struct br_mdb_entry e;
119
120 port = p->port;
121 if (!port)
122 continue;
123
124 memset(&e, 0, sizeof(e));
125 e.ifindex = port->dev->ifindex;
126 e.vid = p->addr.vid;
127 __mdb_entry_fill_flags(&e, p->flags);
128 if (p->addr.proto == htons(ETH_P_IP))
129 e.addr.u.ip4 = p->addr.u.ip4;
130 #if IS_ENABLED(CONFIG_IPV6)
131 if (p->addr.proto == htons(ETH_P_IPV6))
132 e.addr.u.ip6 = p->addr.u.ip6;
133 #endif
134 e.addr.proto = p->addr.proto;
135 nest_ent = nla_nest_start(skb,
136 MDBA_MDB_ENTRY_INFO);
137 if (!nest_ent) {
138 nla_nest_cancel(skb, nest2);
139 err = -EMSGSIZE;
140 goto out;
141 }
142 if (nla_put_nohdr(skb, sizeof(e), &e) ||
143 nla_put_u32(skb,
144 MDBA_MDB_EATTR_TIMER,
145 br_timer_value(&p->timer))) {
146 nla_nest_cancel(skb, nest_ent);
147 nla_nest_cancel(skb, nest2);
148 err = -EMSGSIZE;
149 goto out;
150 }
151 nla_nest_end(skb, nest_ent);
152 }
153 nla_nest_end(skb, nest2);
154 skip:
155 idx++;
156 }
157 }
158
159 out:
160 cb->args[1] = idx;
161 nla_nest_end(skb, nest);
162 return err;
163 }
164
br_mdb_dump(struct sk_buff * skb,struct netlink_callback * cb)165 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
166 {
167 struct net_device *dev;
168 struct net *net = sock_net(skb->sk);
169 struct nlmsghdr *nlh = NULL;
170 int idx = 0, s_idx;
171
172 s_idx = cb->args[0];
173
174 rcu_read_lock();
175
176 /* In theory this could be wrapped to 0... */
177 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
178
179 for_each_netdev_rcu(net, dev) {
180 if (dev->priv_flags & IFF_EBRIDGE) {
181 struct br_port_msg *bpm;
182
183 if (idx < s_idx)
184 goto skip;
185
186 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
187 cb->nlh->nlmsg_seq, RTM_GETMDB,
188 sizeof(*bpm), NLM_F_MULTI);
189 if (nlh == NULL)
190 break;
191
192 bpm = nlmsg_data(nlh);
193 memset(bpm, 0, sizeof(*bpm));
194 bpm->ifindex = dev->ifindex;
195 if (br_mdb_fill_info(skb, cb, dev) < 0)
196 goto out;
197 if (br_rports_fill_info(skb, cb, dev) < 0)
198 goto out;
199
200 cb->args[1] = 0;
201 nlmsg_end(skb, nlh);
202 skip:
203 idx++;
204 }
205 }
206
207 out:
208 if (nlh)
209 nlmsg_end(skb, nlh);
210 rcu_read_unlock();
211 cb->args[0] = idx;
212 return skb->len;
213 }
214
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)215 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
216 struct net_device *dev,
217 struct br_mdb_entry *entry, u32 pid,
218 u32 seq, int type, unsigned int flags)
219 {
220 struct nlmsghdr *nlh;
221 struct br_port_msg *bpm;
222 struct nlattr *nest, *nest2;
223
224 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
225 if (!nlh)
226 return -EMSGSIZE;
227
228 bpm = nlmsg_data(nlh);
229 memset(bpm, 0, sizeof(*bpm));
230 bpm->family = AF_BRIDGE;
231 bpm->ifindex = dev->ifindex;
232 nest = nla_nest_start(skb, MDBA_MDB);
233 if (nest == NULL)
234 goto cancel;
235 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
236 if (nest2 == NULL)
237 goto end;
238
239 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
240 goto end;
241
242 nla_nest_end(skb, nest2);
243 nla_nest_end(skb, nest);
244 nlmsg_end(skb, nlh);
245 return 0;
246
247 end:
248 nla_nest_end(skb, nest);
249 cancel:
250 nlmsg_cancel(skb, nlh);
251 return -EMSGSIZE;
252 }
253
rtnl_mdb_nlmsg_size(void)254 static inline size_t rtnl_mdb_nlmsg_size(void)
255 {
256 return NLMSG_ALIGN(sizeof(struct br_port_msg))
257 + nla_total_size(sizeof(struct br_mdb_entry));
258 }
259
260 struct br_mdb_complete_info {
261 struct net_bridge_port *port;
262 struct br_ip ip;
263 };
264
br_mdb_complete(struct net_device * dev,int err,void * priv)265 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
266 {
267 struct br_mdb_complete_info *data = priv;
268 struct net_bridge_port_group __rcu **pp;
269 struct net_bridge_port_group *p;
270 struct net_bridge_mdb_htable *mdb;
271 struct net_bridge_mdb_entry *mp;
272 struct net_bridge_port *port = data->port;
273 struct net_bridge *br = port->br;
274
275 if (err)
276 goto err;
277
278 spin_lock_bh(&br->multicast_lock);
279 mdb = mlock_dereference(br->mdb, br);
280 mp = br_mdb_ip_get(mdb, &data->ip);
281 if (!mp)
282 goto out;
283 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
284 pp = &p->next) {
285 if (p->port != port)
286 continue;
287 p->flags |= MDB_PG_FLAGS_OFFLOAD;
288 }
289 out:
290 spin_unlock_bh(&br->multicast_lock);
291 err:
292 kfree(priv);
293 }
294
__br_mdb_notify(struct net_device * dev,struct net_bridge_port * p,struct br_mdb_entry * entry,int type)295 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
296 struct br_mdb_entry *entry, int type)
297 {
298 struct br_mdb_complete_info *complete_info;
299 struct switchdev_obj_port_mdb mdb = {
300 .obj = {
301 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
302 .flags = SWITCHDEV_F_DEFER,
303 },
304 .vid = entry->vid,
305 };
306 struct net_device *port_dev;
307 struct net *net = dev_net(dev);
308 struct sk_buff *skb;
309 int err = -ENOBUFS;
310
311 port_dev = __dev_get_by_index(net, entry->ifindex);
312 if (entry->addr.proto == htons(ETH_P_IP))
313 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
314 #if IS_ENABLED(CONFIG_IPV6)
315 else
316 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
317 #endif
318
319 mdb.obj.orig_dev = port_dev;
320 if (port_dev && type == RTM_NEWMDB) {
321 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
322 if (complete_info) {
323 complete_info->port = p;
324 __mdb_entry_to_br_ip(entry, &complete_info->ip);
325 mdb.obj.complete_priv = complete_info;
326 mdb.obj.complete = br_mdb_complete;
327 if (switchdev_port_obj_add(port_dev, &mdb.obj))
328 kfree(complete_info);
329 }
330 } else if (port_dev && type == RTM_DELMDB) {
331 switchdev_port_obj_del(port_dev, &mdb.obj);
332 }
333
334 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
335 if (!skb)
336 goto errout;
337
338 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
339 if (err < 0) {
340 kfree_skb(skb);
341 goto errout;
342 }
343
344 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
345 return;
346 errout:
347 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
348 }
349
br_mdb_notify(struct net_device * dev,struct net_bridge_port * port,struct br_ip * group,int type,u8 flags)350 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
351 struct br_ip *group, int type, u8 flags)
352 {
353 struct br_mdb_entry entry;
354
355 memset(&entry, 0, sizeof(entry));
356 entry.ifindex = port->dev->ifindex;
357 entry.addr.proto = group->proto;
358 entry.addr.u.ip4 = group->u.ip4;
359 #if IS_ENABLED(CONFIG_IPV6)
360 entry.addr.u.ip6 = group->u.ip6;
361 #endif
362 entry.vid = group->vid;
363 __mdb_entry_fill_flags(&entry, flags);
364 __br_mdb_notify(dev, port, &entry, type);
365 }
366
nlmsg_populate_rtr_fill(struct sk_buff * skb,struct net_device * dev,int ifindex,u32 pid,u32 seq,int type,unsigned int flags)367 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
368 struct net_device *dev,
369 int ifindex, u32 pid,
370 u32 seq, int type, unsigned int flags)
371 {
372 struct br_port_msg *bpm;
373 struct nlmsghdr *nlh;
374 struct nlattr *nest;
375
376 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
377 if (!nlh)
378 return -EMSGSIZE;
379
380 bpm = nlmsg_data(nlh);
381 memset(bpm, 0, sizeof(*bpm));
382 bpm->family = AF_BRIDGE;
383 bpm->ifindex = dev->ifindex;
384 nest = nla_nest_start(skb, MDBA_ROUTER);
385 if (!nest)
386 goto cancel;
387
388 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
389 goto end;
390
391 nla_nest_end(skb, nest);
392 nlmsg_end(skb, nlh);
393 return 0;
394
395 end:
396 nla_nest_end(skb, nest);
397 cancel:
398 nlmsg_cancel(skb, nlh);
399 return -EMSGSIZE;
400 }
401
rtnl_rtr_nlmsg_size(void)402 static inline size_t rtnl_rtr_nlmsg_size(void)
403 {
404 return NLMSG_ALIGN(sizeof(struct br_port_msg))
405 + nla_total_size(sizeof(__u32));
406 }
407
br_rtr_notify(struct net_device * dev,struct net_bridge_port * port,int type)408 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
409 int type)
410 {
411 struct net *net = dev_net(dev);
412 struct sk_buff *skb;
413 int err = -ENOBUFS;
414 int ifindex;
415
416 ifindex = port ? port->dev->ifindex : 0;
417 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
418 if (!skb)
419 goto errout;
420
421 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
422 if (err < 0) {
423 kfree_skb(skb);
424 goto errout;
425 }
426
427 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
428 return;
429
430 errout:
431 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
432 }
433
is_valid_mdb_entry(struct br_mdb_entry * entry)434 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
435 {
436 if (entry->ifindex == 0)
437 return false;
438
439 if (entry->addr.proto == htons(ETH_P_IP)) {
440 if (!ipv4_is_multicast(entry->addr.u.ip4))
441 return false;
442 if (ipv4_is_local_multicast(entry->addr.u.ip4))
443 return false;
444 #if IS_ENABLED(CONFIG_IPV6)
445 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
446 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
447 return false;
448 #endif
449 } else
450 return false;
451 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
452 return false;
453 if (entry->vid >= VLAN_VID_MASK)
454 return false;
455
456 return true;
457 }
458
br_mdb_parse(struct sk_buff * skb,struct nlmsghdr * nlh,struct net_device ** pdev,struct br_mdb_entry ** pentry)459 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
460 struct net_device **pdev, struct br_mdb_entry **pentry)
461 {
462 struct net *net = sock_net(skb->sk);
463 struct br_mdb_entry *entry;
464 struct br_port_msg *bpm;
465 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
466 struct net_device *dev;
467 int err;
468
469 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
470 NULL);
471 if (err < 0)
472 return err;
473
474 bpm = nlmsg_data(nlh);
475 if (bpm->ifindex == 0) {
476 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
477 return -EINVAL;
478 }
479
480 dev = __dev_get_by_index(net, bpm->ifindex);
481 if (dev == NULL) {
482 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
483 return -ENODEV;
484 }
485
486 if (!(dev->priv_flags & IFF_EBRIDGE)) {
487 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
488 return -EOPNOTSUPP;
489 }
490
491 *pdev = dev;
492
493 if (!tb[MDBA_SET_ENTRY] ||
494 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
495 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
496 return -EINVAL;
497 }
498
499 entry = nla_data(tb[MDBA_SET_ENTRY]);
500 if (!is_valid_mdb_entry(entry)) {
501 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
502 return -EINVAL;
503 }
504
505 *pentry = entry;
506 return 0;
507 }
508
br_mdb_add_group(struct net_bridge * br,struct net_bridge_port * port,struct br_ip * group,unsigned char state)509 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
510 struct br_ip *group, unsigned char state)
511 {
512 struct net_bridge_mdb_entry *mp;
513 struct net_bridge_port_group *p;
514 struct net_bridge_port_group __rcu **pp;
515 struct net_bridge_mdb_htable *mdb;
516 unsigned long now = jiffies;
517 int err;
518
519 mdb = mlock_dereference(br->mdb, br);
520 mp = br_mdb_ip_get(mdb, group);
521 if (!mp) {
522 mp = br_multicast_new_group(br, port, group);
523 err = PTR_ERR_OR_ZERO(mp);
524 if (err)
525 return err;
526 }
527
528 for (pp = &mp->ports;
529 (p = mlock_dereference(*pp, br)) != NULL;
530 pp = &p->next) {
531 if (p->port == port)
532 return -EEXIST;
533 if ((unsigned long)p->port < (unsigned long)port)
534 break;
535 }
536
537 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
538 if (unlikely(!p))
539 return -ENOMEM;
540 rcu_assign_pointer(*pp, p);
541 if (state == MDB_TEMPORARY)
542 mod_timer(&p->timer, now + br->multicast_membership_interval);
543
544 return 0;
545 }
546
__br_mdb_add(struct net * net,struct net_bridge * br,struct br_mdb_entry * entry)547 static int __br_mdb_add(struct net *net, struct net_bridge *br,
548 struct br_mdb_entry *entry)
549 {
550 struct br_ip ip;
551 struct net_device *dev;
552 struct net_bridge_port *p;
553 int ret;
554
555 if (!netif_running(br->dev) || br->multicast_disabled)
556 return -EINVAL;
557
558 dev = __dev_get_by_index(net, entry->ifindex);
559 if (!dev)
560 return -ENODEV;
561
562 p = br_port_get_rtnl(dev);
563 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
564 return -EINVAL;
565
566 __mdb_entry_to_br_ip(entry, &ip);
567
568 spin_lock_bh(&br->multicast_lock);
569 ret = br_mdb_add_group(br, p, &ip, entry->state);
570 spin_unlock_bh(&br->multicast_lock);
571 return ret;
572 }
573
br_mdb_add(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)574 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
575 struct netlink_ext_ack *extack)
576 {
577 struct net *net = sock_net(skb->sk);
578 struct net_bridge_vlan_group *vg;
579 struct net_device *dev, *pdev;
580 struct br_mdb_entry *entry;
581 struct net_bridge_port *p;
582 struct net_bridge_vlan *v;
583 struct net_bridge *br;
584 int err;
585
586 err = br_mdb_parse(skb, nlh, &dev, &entry);
587 if (err < 0)
588 return err;
589
590 br = netdev_priv(dev);
591
592 /* If vlan filtering is enabled and VLAN is not specified
593 * install mdb entry on all vlans configured on the port.
594 */
595 pdev = __dev_get_by_index(net, entry->ifindex);
596 if (!pdev)
597 return -ENODEV;
598
599 p = br_port_get_rtnl(pdev);
600 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
601 return -EINVAL;
602
603 vg = nbp_vlan_group(p);
604 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
605 list_for_each_entry(v, &vg->vlan_list, vlist) {
606 entry->vid = v->vid;
607 err = __br_mdb_add(net, br, entry);
608 if (err)
609 break;
610 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
611 }
612 } else {
613 err = __br_mdb_add(net, br, entry);
614 if (!err)
615 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
616 }
617
618 return err;
619 }
620
__br_mdb_del(struct net_bridge * br,struct br_mdb_entry * entry)621 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
622 {
623 struct net_bridge_mdb_htable *mdb;
624 struct net_bridge_mdb_entry *mp;
625 struct net_bridge_port_group *p;
626 struct net_bridge_port_group __rcu **pp;
627 struct br_ip ip;
628 int err = -EINVAL;
629
630 if (!netif_running(br->dev) || br->multicast_disabled)
631 return -EINVAL;
632
633 __mdb_entry_to_br_ip(entry, &ip);
634
635 spin_lock_bh(&br->multicast_lock);
636 mdb = mlock_dereference(br->mdb, br);
637
638 mp = br_mdb_ip_get(mdb, &ip);
639 if (!mp)
640 goto unlock;
641
642 for (pp = &mp->ports;
643 (p = mlock_dereference(*pp, br)) != NULL;
644 pp = &p->next) {
645 if (!p->port || p->port->dev->ifindex != entry->ifindex)
646 continue;
647
648 if (p->port->state == BR_STATE_DISABLED)
649 goto unlock;
650
651 __mdb_entry_fill_flags(entry, p->flags);
652 rcu_assign_pointer(*pp, p->next);
653 hlist_del_init(&p->mglist);
654 del_timer(&p->timer);
655 call_rcu_bh(&p->rcu, br_multicast_free_pg);
656 err = 0;
657
658 if (!mp->ports && !mp->mglist &&
659 netif_running(br->dev))
660 mod_timer(&mp->timer, jiffies);
661 break;
662 }
663
664 unlock:
665 spin_unlock_bh(&br->multicast_lock);
666 return err;
667 }
668
br_mdb_del(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)669 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
670 struct netlink_ext_ack *extack)
671 {
672 struct net *net = sock_net(skb->sk);
673 struct net_bridge_vlan_group *vg;
674 struct net_device *dev, *pdev;
675 struct br_mdb_entry *entry;
676 struct net_bridge_port *p;
677 struct net_bridge_vlan *v;
678 struct net_bridge *br;
679 int err;
680
681 err = br_mdb_parse(skb, nlh, &dev, &entry);
682 if (err < 0)
683 return err;
684
685 br = netdev_priv(dev);
686
687 /* If vlan filtering is enabled and VLAN is not specified
688 * delete mdb entry on all vlans configured on the port.
689 */
690 pdev = __dev_get_by_index(net, entry->ifindex);
691 if (!pdev)
692 return -ENODEV;
693
694 p = br_port_get_rtnl(pdev);
695 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
696 return -EINVAL;
697
698 vg = nbp_vlan_group(p);
699 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
700 list_for_each_entry(v, &vg->vlan_list, vlist) {
701 entry->vid = v->vid;
702 err = __br_mdb_del(br, entry);
703 if (!err)
704 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
705 }
706 } else {
707 err = __br_mdb_del(br, entry);
708 if (!err)
709 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
710 }
711
712 return err;
713 }
714
br_mdb_init(void)715 void br_mdb_init(void)
716 {
717 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
718 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
719 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
720 }
721
br_mdb_uninit(void)722 void br_mdb_uninit(void)
723 {
724 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
725 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
726 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
727 }
728