xref: /openbmc/linux/net/bridge/br_mdb.c (revision 01a6e126)
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 
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 
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 
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 
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 
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 
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 
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 
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 
295 static void br_mdb_switchdev_host_port(struct net_device *dev,
296 				       struct net_device *lower_dev,
297 				       struct br_mdb_entry *entry, int type)
298 {
299 	struct switchdev_obj_port_mdb mdb = {
300 		.obj = {
301 			.id = SWITCHDEV_OBJ_ID_HOST_MDB,
302 			.flags = SWITCHDEV_F_DEFER,
303 		},
304 		.vid = entry->vid,
305 	};
306 
307 	if (entry->addr.proto == htons(ETH_P_IP))
308 		ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
309 #if IS_ENABLED(CONFIG_IPV6)
310 	else
311 		ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
312 #endif
313 
314 	mdb.obj.orig_dev = dev;
315 	switch (type) {
316 	case RTM_NEWMDB:
317 		switchdev_port_obj_add(lower_dev, &mdb.obj);
318 		break;
319 	case RTM_DELMDB:
320 		switchdev_port_obj_del(lower_dev, &mdb.obj);
321 		break;
322 	}
323 }
324 
325 static void br_mdb_switchdev_host(struct net_device *dev,
326 				  struct br_mdb_entry *entry, int type)
327 {
328 	struct net_device *lower_dev;
329 	struct list_head *iter;
330 
331 	netdev_for_each_lower_dev(dev, lower_dev, iter)
332 		br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
333 }
334 
335 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
336 			    struct br_mdb_entry *entry, int type)
337 {
338 	struct br_mdb_complete_info *complete_info;
339 	struct switchdev_obj_port_mdb mdb = {
340 		.obj = {
341 			.id = SWITCHDEV_OBJ_ID_PORT_MDB,
342 			.flags = SWITCHDEV_F_DEFER,
343 		},
344 		.vid = entry->vid,
345 	};
346 	struct net_device *port_dev;
347 	struct net *net = dev_net(dev);
348 	struct sk_buff *skb;
349 	int err = -ENOBUFS;
350 
351 	port_dev = __dev_get_by_index(net, entry->ifindex);
352 	if (entry->addr.proto == htons(ETH_P_IP))
353 		ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
354 #if IS_ENABLED(CONFIG_IPV6)
355 	else
356 		ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
357 #endif
358 
359 	mdb.obj.orig_dev = port_dev;
360 	if (p && port_dev && type == RTM_NEWMDB) {
361 		complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
362 		if (complete_info) {
363 			complete_info->port = p;
364 			__mdb_entry_to_br_ip(entry, &complete_info->ip);
365 			mdb.obj.complete_priv = complete_info;
366 			mdb.obj.complete = br_mdb_complete;
367 			if (switchdev_port_obj_add(port_dev, &mdb.obj))
368 				kfree(complete_info);
369 		}
370 	} else if (p && port_dev && type == RTM_DELMDB) {
371 		switchdev_port_obj_del(port_dev, &mdb.obj);
372 	}
373 
374 	if (!p)
375 		br_mdb_switchdev_host(dev, entry, type);
376 
377 	skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
378 	if (!skb)
379 		goto errout;
380 
381 	err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
382 	if (err < 0) {
383 		kfree_skb(skb);
384 		goto errout;
385 	}
386 
387 	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
388 	return;
389 errout:
390 	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
391 }
392 
393 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
394 		   struct br_ip *group, int type, u8 flags)
395 {
396 	struct br_mdb_entry entry;
397 
398 	memset(&entry, 0, sizeof(entry));
399 	if (port)
400 		entry.ifindex = port->dev->ifindex;
401 	else
402 		entry.ifindex = dev->ifindex;
403 	entry.addr.proto = group->proto;
404 	entry.addr.u.ip4 = group->u.ip4;
405 #if IS_ENABLED(CONFIG_IPV6)
406 	entry.addr.u.ip6 = group->u.ip6;
407 #endif
408 	entry.vid = group->vid;
409 	__mdb_entry_fill_flags(&entry, flags);
410 	__br_mdb_notify(dev, port, &entry, type);
411 }
412 
413 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
414 				   struct net_device *dev,
415 				   int ifindex, u32 pid,
416 				   u32 seq, int type, unsigned int flags)
417 {
418 	struct br_port_msg *bpm;
419 	struct nlmsghdr *nlh;
420 	struct nlattr *nest;
421 
422 	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
423 	if (!nlh)
424 		return -EMSGSIZE;
425 
426 	bpm = nlmsg_data(nlh);
427 	memset(bpm, 0, sizeof(*bpm));
428 	bpm->family = AF_BRIDGE;
429 	bpm->ifindex = dev->ifindex;
430 	nest = nla_nest_start(skb, MDBA_ROUTER);
431 	if (!nest)
432 		goto cancel;
433 
434 	if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
435 		goto end;
436 
437 	nla_nest_end(skb, nest);
438 	nlmsg_end(skb, nlh);
439 	return 0;
440 
441 end:
442 	nla_nest_end(skb, nest);
443 cancel:
444 	nlmsg_cancel(skb, nlh);
445 	return -EMSGSIZE;
446 }
447 
448 static inline size_t rtnl_rtr_nlmsg_size(void)
449 {
450 	return NLMSG_ALIGN(sizeof(struct br_port_msg))
451 		+ nla_total_size(sizeof(__u32));
452 }
453 
454 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
455 		   int type)
456 {
457 	struct net *net = dev_net(dev);
458 	struct sk_buff *skb;
459 	int err = -ENOBUFS;
460 	int ifindex;
461 
462 	ifindex = port ? port->dev->ifindex : 0;
463 	skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
464 	if (!skb)
465 		goto errout;
466 
467 	err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
468 	if (err < 0) {
469 		kfree_skb(skb);
470 		goto errout;
471 	}
472 
473 	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
474 	return;
475 
476 errout:
477 	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
478 }
479 
480 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
481 {
482 	if (entry->ifindex == 0)
483 		return false;
484 
485 	if (entry->addr.proto == htons(ETH_P_IP)) {
486 		if (!ipv4_is_multicast(entry->addr.u.ip4))
487 			return false;
488 		if (ipv4_is_local_multicast(entry->addr.u.ip4))
489 			return false;
490 #if IS_ENABLED(CONFIG_IPV6)
491 	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
492 		if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
493 			return false;
494 #endif
495 	} else
496 		return false;
497 	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
498 		return false;
499 	if (entry->vid >= VLAN_VID_MASK)
500 		return false;
501 
502 	return true;
503 }
504 
505 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
506 			struct net_device **pdev, struct br_mdb_entry **pentry)
507 {
508 	struct net *net = sock_net(skb->sk);
509 	struct br_mdb_entry *entry;
510 	struct br_port_msg *bpm;
511 	struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
512 	struct net_device *dev;
513 	int err;
514 
515 	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
516 			  NULL);
517 	if (err < 0)
518 		return err;
519 
520 	bpm = nlmsg_data(nlh);
521 	if (bpm->ifindex == 0) {
522 		pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
523 		return -EINVAL;
524 	}
525 
526 	dev = __dev_get_by_index(net, bpm->ifindex);
527 	if (dev == NULL) {
528 		pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
529 		return -ENODEV;
530 	}
531 
532 	if (!(dev->priv_flags & IFF_EBRIDGE)) {
533 		pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
534 		return -EOPNOTSUPP;
535 	}
536 
537 	*pdev = dev;
538 
539 	if (!tb[MDBA_SET_ENTRY] ||
540 	    nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
541 		pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
542 		return -EINVAL;
543 	}
544 
545 	entry = nla_data(tb[MDBA_SET_ENTRY]);
546 	if (!is_valid_mdb_entry(entry)) {
547 		pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
548 		return -EINVAL;
549 	}
550 
551 	*pentry = entry;
552 	return 0;
553 }
554 
555 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
556 			    struct br_ip *group, unsigned char state)
557 {
558 	struct net_bridge_mdb_entry *mp;
559 	struct net_bridge_port_group *p;
560 	struct net_bridge_port_group __rcu **pp;
561 	struct net_bridge_mdb_htable *mdb;
562 	unsigned long now = jiffies;
563 	int err;
564 
565 	mdb = mlock_dereference(br->mdb, br);
566 	mp = br_mdb_ip_get(mdb, group);
567 	if (!mp) {
568 		mp = br_multicast_new_group(br, port, group);
569 		err = PTR_ERR_OR_ZERO(mp);
570 		if (err)
571 			return err;
572 	}
573 
574 	for (pp = &mp->ports;
575 	     (p = mlock_dereference(*pp, br)) != NULL;
576 	     pp = &p->next) {
577 		if (p->port == port)
578 			return -EEXIST;
579 		if ((unsigned long)p->port < (unsigned long)port)
580 			break;
581 	}
582 
583 	p = br_multicast_new_port_group(port, group, *pp, state, NULL);
584 	if (unlikely(!p))
585 		return -ENOMEM;
586 	rcu_assign_pointer(*pp, p);
587 	if (state == MDB_TEMPORARY)
588 		mod_timer(&p->timer, now + br->multicast_membership_interval);
589 
590 	return 0;
591 }
592 
593 static int __br_mdb_add(struct net *net, struct net_bridge *br,
594 			struct br_mdb_entry *entry)
595 {
596 	struct br_ip ip;
597 	struct net_device *dev;
598 	struct net_bridge_port *p;
599 	int ret;
600 
601 	if (!netif_running(br->dev) || br->multicast_disabled)
602 		return -EINVAL;
603 
604 	dev = __dev_get_by_index(net, entry->ifindex);
605 	if (!dev)
606 		return -ENODEV;
607 
608 	p = br_port_get_rtnl(dev);
609 	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
610 		return -EINVAL;
611 
612 	__mdb_entry_to_br_ip(entry, &ip);
613 
614 	spin_lock_bh(&br->multicast_lock);
615 	ret = br_mdb_add_group(br, p, &ip, entry->state);
616 	spin_unlock_bh(&br->multicast_lock);
617 	return ret;
618 }
619 
620 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
621 		      struct netlink_ext_ack *extack)
622 {
623 	struct net *net = sock_net(skb->sk);
624 	struct net_bridge_vlan_group *vg;
625 	struct net_device *dev, *pdev;
626 	struct br_mdb_entry *entry;
627 	struct net_bridge_port *p;
628 	struct net_bridge_vlan *v;
629 	struct net_bridge *br;
630 	int err;
631 
632 	err = br_mdb_parse(skb, nlh, &dev, &entry);
633 	if (err < 0)
634 		return err;
635 
636 	br = netdev_priv(dev);
637 
638 	/* If vlan filtering is enabled and VLAN is not specified
639 	 * install mdb entry on all vlans configured on the port.
640 	 */
641 	pdev = __dev_get_by_index(net, entry->ifindex);
642 	if (!pdev)
643 		return -ENODEV;
644 
645 	p = br_port_get_rtnl(pdev);
646 	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
647 		return -EINVAL;
648 
649 	vg = nbp_vlan_group(p);
650 	if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
651 		list_for_each_entry(v, &vg->vlan_list, vlist) {
652 			entry->vid = v->vid;
653 			err = __br_mdb_add(net, br, entry);
654 			if (err)
655 				break;
656 			__br_mdb_notify(dev, p, entry, RTM_NEWMDB);
657 		}
658 	} else {
659 		err = __br_mdb_add(net, br, entry);
660 		if (!err)
661 			__br_mdb_notify(dev, p, entry, RTM_NEWMDB);
662 	}
663 
664 	return err;
665 }
666 
667 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
668 {
669 	struct net_bridge_mdb_htable *mdb;
670 	struct net_bridge_mdb_entry *mp;
671 	struct net_bridge_port_group *p;
672 	struct net_bridge_port_group __rcu **pp;
673 	struct br_ip ip;
674 	int err = -EINVAL;
675 
676 	if (!netif_running(br->dev) || br->multicast_disabled)
677 		return -EINVAL;
678 
679 	__mdb_entry_to_br_ip(entry, &ip);
680 
681 	spin_lock_bh(&br->multicast_lock);
682 	mdb = mlock_dereference(br->mdb, br);
683 
684 	mp = br_mdb_ip_get(mdb, &ip);
685 	if (!mp)
686 		goto unlock;
687 
688 	for (pp = &mp->ports;
689 	     (p = mlock_dereference(*pp, br)) != NULL;
690 	     pp = &p->next) {
691 		if (!p->port || p->port->dev->ifindex != entry->ifindex)
692 			continue;
693 
694 		if (p->port->state == BR_STATE_DISABLED)
695 			goto unlock;
696 
697 		__mdb_entry_fill_flags(entry, p->flags);
698 		rcu_assign_pointer(*pp, p->next);
699 		hlist_del_init(&p->mglist);
700 		del_timer(&p->timer);
701 		call_rcu_bh(&p->rcu, br_multicast_free_pg);
702 		err = 0;
703 
704 		if (!mp->ports && !mp->host_joined &&
705 		    netif_running(br->dev))
706 			mod_timer(&mp->timer, jiffies);
707 		break;
708 	}
709 
710 unlock:
711 	spin_unlock_bh(&br->multicast_lock);
712 	return err;
713 }
714 
715 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
716 		      struct netlink_ext_ack *extack)
717 {
718 	struct net *net = sock_net(skb->sk);
719 	struct net_bridge_vlan_group *vg;
720 	struct net_device *dev, *pdev;
721 	struct br_mdb_entry *entry;
722 	struct net_bridge_port *p;
723 	struct net_bridge_vlan *v;
724 	struct net_bridge *br;
725 	int err;
726 
727 	err = br_mdb_parse(skb, nlh, &dev, &entry);
728 	if (err < 0)
729 		return err;
730 
731 	br = netdev_priv(dev);
732 
733 	/* If vlan filtering is enabled and VLAN is not specified
734 	 * delete mdb entry on all vlans configured on the port.
735 	 */
736 	pdev = __dev_get_by_index(net, entry->ifindex);
737 	if (!pdev)
738 		return -ENODEV;
739 
740 	p = br_port_get_rtnl(pdev);
741 	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
742 		return -EINVAL;
743 
744 	vg = nbp_vlan_group(p);
745 	if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
746 		list_for_each_entry(v, &vg->vlan_list, vlist) {
747 			entry->vid = v->vid;
748 			err = __br_mdb_del(br, entry);
749 			if (!err)
750 				__br_mdb_notify(dev, p, entry, RTM_DELMDB);
751 		}
752 	} else {
753 		err = __br_mdb_del(br, entry);
754 		if (!err)
755 			__br_mdb_notify(dev, p, entry, RTM_DELMDB);
756 	}
757 
758 	return err;
759 }
760 
761 void br_mdb_init(void)
762 {
763 	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
764 	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
765 	rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
766 }
767 
768 void br_mdb_uninit(void)
769 {
770 	rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
771 	rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
772 	rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
773 }
774