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 bool
br_ip4_rports_get_timer(struct net_bridge_mcast_port * pmctx,unsigned long * timer)20 br_ip4_rports_get_timer(struct net_bridge_mcast_port *pmctx,
21 unsigned long *timer)
22 {
23 *timer = br_timer_value(&pmctx->ip4_mc_router_timer);
24 return !hlist_unhashed(&pmctx->ip4_rlist);
25 }
26
27 static bool
br_ip6_rports_get_timer(struct net_bridge_mcast_port * pmctx,unsigned long * timer)28 br_ip6_rports_get_timer(struct net_bridge_mcast_port *pmctx,
29 unsigned long *timer)
30 {
31 #if IS_ENABLED(CONFIG_IPV6)
32 *timer = br_timer_value(&pmctx->ip6_mc_router_timer);
33 return !hlist_unhashed(&pmctx->ip6_rlist);
34 #else
35 *timer = 0;
36 return false;
37 #endif
38 }
39
__br_rports_one_size(void)40 static size_t __br_rports_one_size(void)
41 {
42 return nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PORT */
43 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_TIMER */
44 nla_total_size(sizeof(u8)) + /* MDBA_ROUTER_PATTR_TYPE */
45 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET_TIMER */
46 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET6_TIMER */
47 nla_total_size(sizeof(u32)); /* MDBA_ROUTER_PATTR_VID */
48 }
49
br_rports_size(const struct net_bridge_mcast * brmctx)50 size_t br_rports_size(const struct net_bridge_mcast *brmctx)
51 {
52 struct net_bridge_mcast_port *pmctx;
53 size_t size = nla_total_size(0); /* MDBA_ROUTER */
54
55 rcu_read_lock();
56 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
57 ip4_rlist)
58 size += __br_rports_one_size();
59
60 #if IS_ENABLED(CONFIG_IPV6)
61 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
62 ip6_rlist)
63 size += __br_rports_one_size();
64 #endif
65 rcu_read_unlock();
66
67 return size;
68 }
69
br_rports_fill_info(struct sk_buff * skb,const struct net_bridge_mcast * brmctx)70 int br_rports_fill_info(struct sk_buff *skb,
71 const struct net_bridge_mcast *brmctx)
72 {
73 u16 vid = brmctx->vlan ? brmctx->vlan->vid : 0;
74 bool have_ip4_mc_rtr, have_ip6_mc_rtr;
75 unsigned long ip4_timer, ip6_timer;
76 struct nlattr *nest, *port_nest;
77 struct net_bridge_port *p;
78
79 if (!brmctx->multicast_router || !br_rports_have_mc_router(brmctx))
80 return 0;
81
82 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
83 if (nest == NULL)
84 return -EMSGSIZE;
85
86 list_for_each_entry_rcu(p, &brmctx->br->port_list, list) {
87 struct net_bridge_mcast_port *pmctx;
88
89 if (vid) {
90 struct net_bridge_vlan *v;
91
92 v = br_vlan_find(nbp_vlan_group(p), vid);
93 if (!v)
94 continue;
95 pmctx = &v->port_mcast_ctx;
96 } else {
97 pmctx = &p->multicast_ctx;
98 }
99
100 have_ip4_mc_rtr = br_ip4_rports_get_timer(pmctx, &ip4_timer);
101 have_ip6_mc_rtr = br_ip6_rports_get_timer(pmctx, &ip6_timer);
102
103 if (!have_ip4_mc_rtr && !have_ip6_mc_rtr)
104 continue;
105
106 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
107 if (!port_nest)
108 goto fail;
109
110 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
111 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
112 max(ip4_timer, ip6_timer)) ||
113 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
114 p->multicast_ctx.multicast_router) ||
115 (have_ip4_mc_rtr &&
116 nla_put_u32(skb, MDBA_ROUTER_PATTR_INET_TIMER,
117 ip4_timer)) ||
118 (have_ip6_mc_rtr &&
119 nla_put_u32(skb, MDBA_ROUTER_PATTR_INET6_TIMER,
120 ip6_timer)) ||
121 (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid))) {
122 nla_nest_cancel(skb, port_nest);
123 goto fail;
124 }
125 nla_nest_end(skb, port_nest);
126 }
127
128 nla_nest_end(skb, nest);
129 return 0;
130 fail:
131 nla_nest_cancel(skb, nest);
132 return -EMSGSIZE;
133 }
134
__mdb_entry_fill_flags(struct br_mdb_entry * e,unsigned char flags)135 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
136 {
137 e->state = flags & MDB_PG_FLAGS_PERMANENT;
138 e->flags = 0;
139 if (flags & MDB_PG_FLAGS_OFFLOAD)
140 e->flags |= MDB_FLAGS_OFFLOAD;
141 if (flags & MDB_PG_FLAGS_FAST_LEAVE)
142 e->flags |= MDB_FLAGS_FAST_LEAVE;
143 if (flags & MDB_PG_FLAGS_STAR_EXCL)
144 e->flags |= MDB_FLAGS_STAR_EXCL;
145 if (flags & MDB_PG_FLAGS_BLOCKED)
146 e->flags |= MDB_FLAGS_BLOCKED;
147 }
148
__mdb_entry_to_br_ip(struct br_mdb_entry * entry,struct br_ip * ip,struct nlattr ** mdb_attrs)149 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip,
150 struct nlattr **mdb_attrs)
151 {
152 memset(ip, 0, sizeof(struct br_ip));
153 ip->vid = entry->vid;
154 ip->proto = entry->addr.proto;
155 switch (ip->proto) {
156 case htons(ETH_P_IP):
157 ip->dst.ip4 = entry->addr.u.ip4;
158 if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
159 ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
160 break;
161 #if IS_ENABLED(CONFIG_IPV6)
162 case htons(ETH_P_IPV6):
163 ip->dst.ip6 = entry->addr.u.ip6;
164 if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
165 ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
166 break;
167 #endif
168 default:
169 ether_addr_copy(ip->dst.mac_addr, entry->addr.u.mac_addr);
170 }
171
172 }
173
__mdb_fill_srcs(struct sk_buff * skb,struct net_bridge_port_group * p)174 static int __mdb_fill_srcs(struct sk_buff *skb,
175 struct net_bridge_port_group *p)
176 {
177 struct net_bridge_group_src *ent;
178 struct nlattr *nest, *nest_ent;
179
180 if (hlist_empty(&p->src_list))
181 return 0;
182
183 nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST);
184 if (!nest)
185 return -EMSGSIZE;
186
187 hlist_for_each_entry_rcu(ent, &p->src_list, node,
188 lockdep_is_held(&p->key.port->br->multicast_lock)) {
189 nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY);
190 if (!nest_ent)
191 goto out_cancel_err;
192 switch (ent->addr.proto) {
193 case htons(ETH_P_IP):
194 if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
195 ent->addr.src.ip4)) {
196 nla_nest_cancel(skb, nest_ent);
197 goto out_cancel_err;
198 }
199 break;
200 #if IS_ENABLED(CONFIG_IPV6)
201 case htons(ETH_P_IPV6):
202 if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
203 &ent->addr.src.ip6)) {
204 nla_nest_cancel(skb, nest_ent);
205 goto out_cancel_err;
206 }
207 break;
208 #endif
209 default:
210 nla_nest_cancel(skb, nest_ent);
211 continue;
212 }
213 if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER,
214 br_timer_value(&ent->timer))) {
215 nla_nest_cancel(skb, nest_ent);
216 goto out_cancel_err;
217 }
218 nla_nest_end(skb, nest_ent);
219 }
220
221 nla_nest_end(skb, nest);
222
223 return 0;
224
225 out_cancel_err:
226 nla_nest_cancel(skb, nest);
227 return -EMSGSIZE;
228 }
229
__mdb_fill_info(struct sk_buff * skb,struct net_bridge_mdb_entry * mp,struct net_bridge_port_group * p)230 static int __mdb_fill_info(struct sk_buff *skb,
231 struct net_bridge_mdb_entry *mp,
232 struct net_bridge_port_group *p)
233 {
234 bool dump_srcs_mode = false;
235 struct timer_list *mtimer;
236 struct nlattr *nest_ent;
237 struct br_mdb_entry e;
238 u8 flags = 0;
239 int ifindex;
240
241 memset(&e, 0, sizeof(e));
242 if (p) {
243 ifindex = p->key.port->dev->ifindex;
244 mtimer = &p->timer;
245 flags = p->flags;
246 } else {
247 ifindex = mp->br->dev->ifindex;
248 mtimer = &mp->timer;
249 }
250
251 __mdb_entry_fill_flags(&e, flags);
252 e.ifindex = ifindex;
253 e.vid = mp->addr.vid;
254 if (mp->addr.proto == htons(ETH_P_IP)) {
255 e.addr.u.ip4 = mp->addr.dst.ip4;
256 #if IS_ENABLED(CONFIG_IPV6)
257 } else if (mp->addr.proto == htons(ETH_P_IPV6)) {
258 e.addr.u.ip6 = mp->addr.dst.ip6;
259 #endif
260 } else {
261 ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
262 e.state = MDB_PERMANENT;
263 }
264 e.addr.proto = mp->addr.proto;
265 nest_ent = nla_nest_start_noflag(skb,
266 MDBA_MDB_ENTRY_INFO);
267 if (!nest_ent)
268 return -EMSGSIZE;
269
270 if (nla_put_nohdr(skb, sizeof(e), &e) ||
271 nla_put_u32(skb,
272 MDBA_MDB_EATTR_TIMER,
273 br_timer_value(mtimer)))
274 goto nest_err;
275
276 switch (mp->addr.proto) {
277 case htons(ETH_P_IP):
278 dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_igmp_version == 3);
279 if (mp->addr.src.ip4) {
280 if (nla_put_in_addr(skb, MDBA_MDB_EATTR_SOURCE,
281 mp->addr.src.ip4))
282 goto nest_err;
283 break;
284 }
285 break;
286 #if IS_ENABLED(CONFIG_IPV6)
287 case htons(ETH_P_IPV6):
288 dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_mld_version == 2);
289 if (!ipv6_addr_any(&mp->addr.src.ip6)) {
290 if (nla_put_in6_addr(skb, MDBA_MDB_EATTR_SOURCE,
291 &mp->addr.src.ip6))
292 goto nest_err;
293 break;
294 }
295 break;
296 #endif
297 default:
298 ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
299 }
300 if (p) {
301 if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, p->rt_protocol))
302 goto nest_err;
303 if (dump_srcs_mode &&
304 (__mdb_fill_srcs(skb, p) ||
305 nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE,
306 p->filter_mode)))
307 goto nest_err;
308 }
309 nla_nest_end(skb, nest_ent);
310
311 return 0;
312
313 nest_err:
314 nla_nest_cancel(skb, nest_ent);
315 return -EMSGSIZE;
316 }
317
br_mdb_fill_info(struct sk_buff * skb,struct netlink_callback * cb,struct net_device * dev)318 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
319 struct net_device *dev)
320 {
321 int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2];
322 struct net_bridge *br = netdev_priv(dev);
323 struct net_bridge_mdb_entry *mp;
324 struct nlattr *nest, *nest2;
325
326 nest = nla_nest_start_noflag(skb, MDBA_MDB);
327 if (nest == NULL)
328 return -EMSGSIZE;
329
330 hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
331 struct net_bridge_port_group *p;
332 struct net_bridge_port_group __rcu **pp;
333
334 if (idx < s_idx)
335 goto skip;
336
337 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
338 if (!nest2) {
339 err = -EMSGSIZE;
340 break;
341 }
342
343 if (!s_pidx && mp->host_joined) {
344 err = __mdb_fill_info(skb, mp, NULL);
345 if (err) {
346 nla_nest_cancel(skb, nest2);
347 break;
348 }
349 }
350
351 for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
352 pp = &p->next) {
353 if (!p->key.port)
354 continue;
355 if (pidx < s_pidx)
356 goto skip_pg;
357
358 err = __mdb_fill_info(skb, mp, p);
359 if (err) {
360 nla_nest_end(skb, nest2);
361 goto out;
362 }
363 skip_pg:
364 pidx++;
365 }
366 pidx = 0;
367 s_pidx = 0;
368 nla_nest_end(skb, nest2);
369 skip:
370 idx++;
371 }
372
373 out:
374 cb->args[1] = idx;
375 cb->args[2] = pidx;
376 nla_nest_end(skb, nest);
377 return err;
378 }
379
br_mdb_dump(struct net_device * dev,struct sk_buff * skb,struct netlink_callback * cb)380 int br_mdb_dump(struct net_device *dev, struct sk_buff *skb,
381 struct netlink_callback *cb)
382 {
383 struct net_bridge *br = netdev_priv(dev);
384 struct br_port_msg *bpm;
385 struct nlmsghdr *nlh;
386 int err;
387
388 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
389 cb->nlh->nlmsg_seq, RTM_GETMDB, sizeof(*bpm),
390 NLM_F_MULTI);
391 if (!nlh)
392 return -EMSGSIZE;
393
394 bpm = nlmsg_data(nlh);
395 memset(bpm, 0, sizeof(*bpm));
396 bpm->ifindex = dev->ifindex;
397
398 rcu_read_lock();
399
400 err = br_mdb_fill_info(skb, cb, dev);
401 if (err)
402 goto out;
403 err = br_rports_fill_info(skb, &br->multicast_ctx);
404 if (err)
405 goto out;
406
407 out:
408 rcu_read_unlock();
409 nlmsg_end(skb, nlh);
410 return err;
411 }
412
nlmsg_populate_mdb_fill(struct sk_buff * skb,struct net_device * dev,struct net_bridge_mdb_entry * mp,struct net_bridge_port_group * pg,int type)413 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
414 struct net_device *dev,
415 struct net_bridge_mdb_entry *mp,
416 struct net_bridge_port_group *pg,
417 int type)
418 {
419 struct nlmsghdr *nlh;
420 struct br_port_msg *bpm;
421 struct nlattr *nest, *nest2;
422
423 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*bpm), 0);
424 if (!nlh)
425 return -EMSGSIZE;
426
427 bpm = nlmsg_data(nlh);
428 memset(bpm, 0, sizeof(*bpm));
429 bpm->family = AF_BRIDGE;
430 bpm->ifindex = dev->ifindex;
431 nest = nla_nest_start_noflag(skb, MDBA_MDB);
432 if (nest == NULL)
433 goto cancel;
434 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
435 if (nest2 == NULL)
436 goto end;
437
438 if (__mdb_fill_info(skb, mp, pg))
439 goto end;
440
441 nla_nest_end(skb, nest2);
442 nla_nest_end(skb, nest);
443 nlmsg_end(skb, nlh);
444 return 0;
445
446 end:
447 nla_nest_end(skb, nest);
448 cancel:
449 nlmsg_cancel(skb, nlh);
450 return -EMSGSIZE;
451 }
452
rtnl_mdb_nlmsg_pg_size(const struct net_bridge_port_group * pg)453 static size_t rtnl_mdb_nlmsg_pg_size(const struct net_bridge_port_group *pg)
454 {
455 struct net_bridge_group_src *ent;
456 size_t nlmsg_size, addr_size = 0;
457
458 /* MDBA_MDB_ENTRY_INFO */
459 nlmsg_size = nla_total_size(sizeof(struct br_mdb_entry)) +
460 /* MDBA_MDB_EATTR_TIMER */
461 nla_total_size(sizeof(u32));
462
463 if (!pg)
464 goto out;
465
466 /* MDBA_MDB_EATTR_RTPROT */
467 nlmsg_size += nla_total_size(sizeof(u8));
468
469 switch (pg->key.addr.proto) {
470 case htons(ETH_P_IP):
471 /* MDBA_MDB_EATTR_SOURCE */
472 if (pg->key.addr.src.ip4)
473 nlmsg_size += nla_total_size(sizeof(__be32));
474 if (pg->key.port->br->multicast_ctx.multicast_igmp_version == 2)
475 goto out;
476 addr_size = sizeof(__be32);
477 break;
478 #if IS_ENABLED(CONFIG_IPV6)
479 case htons(ETH_P_IPV6):
480 /* MDBA_MDB_EATTR_SOURCE */
481 if (!ipv6_addr_any(&pg->key.addr.src.ip6))
482 nlmsg_size += nla_total_size(sizeof(struct in6_addr));
483 if (pg->key.port->br->multicast_ctx.multicast_mld_version == 1)
484 goto out;
485 addr_size = sizeof(struct in6_addr);
486 break;
487 #endif
488 }
489
490 /* MDBA_MDB_EATTR_GROUP_MODE */
491 nlmsg_size += nla_total_size(sizeof(u8));
492
493 /* MDBA_MDB_EATTR_SRC_LIST nested attr */
494 if (!hlist_empty(&pg->src_list))
495 nlmsg_size += nla_total_size(0);
496
497 hlist_for_each_entry(ent, &pg->src_list, node) {
498 /* MDBA_MDB_SRCLIST_ENTRY nested attr +
499 * MDBA_MDB_SRCATTR_ADDRESS + MDBA_MDB_SRCATTR_TIMER
500 */
501 nlmsg_size += nla_total_size(0) +
502 nla_total_size(addr_size) +
503 nla_total_size(sizeof(u32));
504 }
505 out:
506 return nlmsg_size;
507 }
508
rtnl_mdb_nlmsg_size(const struct net_bridge_port_group * pg)509 static size_t rtnl_mdb_nlmsg_size(const struct net_bridge_port_group *pg)
510 {
511 return NLMSG_ALIGN(sizeof(struct br_port_msg)) +
512 /* MDBA_MDB */
513 nla_total_size(0) +
514 /* MDBA_MDB_ENTRY */
515 nla_total_size(0) +
516 /* Port group entry */
517 rtnl_mdb_nlmsg_pg_size(pg);
518 }
519
br_mdb_notify(struct net_device * dev,struct net_bridge_mdb_entry * mp,struct net_bridge_port_group * pg,int type)520 void br_mdb_notify(struct net_device *dev,
521 struct net_bridge_mdb_entry *mp,
522 struct net_bridge_port_group *pg,
523 int type)
524 {
525 struct net *net = dev_net(dev);
526 struct sk_buff *skb;
527 int err = -ENOBUFS;
528
529 br_switchdev_mdb_notify(dev, mp, pg, type);
530
531 skb = nlmsg_new(rtnl_mdb_nlmsg_size(pg), GFP_ATOMIC);
532 if (!skb)
533 goto errout;
534
535 err = nlmsg_populate_mdb_fill(skb, dev, mp, pg, type);
536 if (err < 0) {
537 kfree_skb(skb);
538 goto errout;
539 }
540
541 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
542 return;
543 errout:
544 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
545 }
546
nlmsg_populate_rtr_fill(struct sk_buff * skb,struct net_device * dev,int ifindex,u16 vid,u32 pid,u32 seq,int type,unsigned int flags)547 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
548 struct net_device *dev,
549 int ifindex, u16 vid, u32 pid,
550 u32 seq, int type, unsigned int flags)
551 {
552 struct nlattr *nest, *port_nest;
553 struct br_port_msg *bpm;
554 struct nlmsghdr *nlh;
555
556 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
557 if (!nlh)
558 return -EMSGSIZE;
559
560 bpm = nlmsg_data(nlh);
561 memset(bpm, 0, sizeof(*bpm));
562 bpm->family = AF_BRIDGE;
563 bpm->ifindex = dev->ifindex;
564 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
565 if (!nest)
566 goto cancel;
567
568 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
569 if (!port_nest)
570 goto end;
571 if (nla_put_nohdr(skb, sizeof(u32), &ifindex)) {
572 nla_nest_cancel(skb, port_nest);
573 goto end;
574 }
575 if (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid)) {
576 nla_nest_cancel(skb, port_nest);
577 goto end;
578 }
579 nla_nest_end(skb, port_nest);
580
581 nla_nest_end(skb, nest);
582 nlmsg_end(skb, nlh);
583 return 0;
584
585 end:
586 nla_nest_end(skb, nest);
587 cancel:
588 nlmsg_cancel(skb, nlh);
589 return -EMSGSIZE;
590 }
591
rtnl_rtr_nlmsg_size(void)592 static inline size_t rtnl_rtr_nlmsg_size(void)
593 {
594 return NLMSG_ALIGN(sizeof(struct br_port_msg))
595 + nla_total_size(sizeof(__u32))
596 + nla_total_size(sizeof(u16));
597 }
598
br_rtr_notify(struct net_device * dev,struct net_bridge_mcast_port * pmctx,int type)599 void br_rtr_notify(struct net_device *dev, struct net_bridge_mcast_port *pmctx,
600 int type)
601 {
602 struct net *net = dev_net(dev);
603 struct sk_buff *skb;
604 int err = -ENOBUFS;
605 int ifindex;
606 u16 vid;
607
608 ifindex = pmctx ? pmctx->port->dev->ifindex : 0;
609 vid = pmctx && br_multicast_port_ctx_is_vlan(pmctx) ? pmctx->vlan->vid :
610 0;
611 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
612 if (!skb)
613 goto errout;
614
615 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, vid, 0, 0, type,
616 NTF_SELF);
617 if (err < 0) {
618 kfree_skb(skb);
619 goto errout;
620 }
621
622 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
623 return;
624
625 errout:
626 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
627 }
628
629 static const struct nla_policy
630 br_mdbe_src_list_entry_pol[MDBE_SRCATTR_MAX + 1] = {
631 [MDBE_SRCATTR_ADDRESS] = NLA_POLICY_RANGE(NLA_BINARY,
632 sizeof(struct in_addr),
633 sizeof(struct in6_addr)),
634 };
635
636 static const struct nla_policy
637 br_mdbe_src_list_pol[MDBE_SRC_LIST_MAX + 1] = {
638 [MDBE_SRC_LIST_ENTRY] = NLA_POLICY_NESTED(br_mdbe_src_list_entry_pol),
639 };
640
641 static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
642 [MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
643 sizeof(struct in_addr),
644 sizeof(struct in6_addr)),
645 [MDBE_ATTR_GROUP_MODE] = NLA_POLICY_RANGE(NLA_U8, MCAST_EXCLUDE,
646 MCAST_INCLUDE),
647 [MDBE_ATTR_SRC_LIST] = NLA_POLICY_NESTED(br_mdbe_src_list_pol),
648 [MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
649 };
650
is_valid_mdb_source(struct nlattr * attr,__be16 proto,struct netlink_ext_ack * extack)651 static bool is_valid_mdb_source(struct nlattr *attr, __be16 proto,
652 struct netlink_ext_ack *extack)
653 {
654 switch (proto) {
655 case htons(ETH_P_IP):
656 if (nla_len(attr) != sizeof(struct in_addr)) {
657 NL_SET_ERR_MSG_MOD(extack, "IPv4 invalid source address length");
658 return false;
659 }
660 if (ipv4_is_multicast(nla_get_in_addr(attr))) {
661 NL_SET_ERR_MSG_MOD(extack, "IPv4 multicast source address is not allowed");
662 return false;
663 }
664 break;
665 #if IS_ENABLED(CONFIG_IPV6)
666 case htons(ETH_P_IPV6): {
667 struct in6_addr src;
668
669 if (nla_len(attr) != sizeof(struct in6_addr)) {
670 NL_SET_ERR_MSG_MOD(extack, "IPv6 invalid source address length");
671 return false;
672 }
673 src = nla_get_in6_addr(attr);
674 if (ipv6_addr_is_multicast(&src)) {
675 NL_SET_ERR_MSG_MOD(extack, "IPv6 multicast source address is not allowed");
676 return false;
677 }
678 break;
679 }
680 #endif
681 default:
682 NL_SET_ERR_MSG_MOD(extack, "Invalid protocol used with source address");
683 return false;
684 }
685
686 return true;
687 }
688
689 static struct net_bridge_mcast *
__br_mdb_choose_context(struct net_bridge * br,const struct br_mdb_entry * entry,struct netlink_ext_ack * extack)690 __br_mdb_choose_context(struct net_bridge *br,
691 const struct br_mdb_entry *entry,
692 struct netlink_ext_ack *extack)
693 {
694 struct net_bridge_mcast *brmctx = NULL;
695 struct net_bridge_vlan *v;
696
697 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
698 brmctx = &br->multicast_ctx;
699 goto out;
700 }
701
702 if (!entry->vid) {
703 NL_SET_ERR_MSG_MOD(extack, "Cannot add an entry without a vlan when vlan snooping is enabled");
704 goto out;
705 }
706
707 v = br_vlan_find(br_vlan_group(br), entry->vid);
708 if (!v) {
709 NL_SET_ERR_MSG_MOD(extack, "Vlan is not configured");
710 goto out;
711 }
712 if (br_multicast_ctx_vlan_global_disabled(&v->br_mcast_ctx)) {
713 NL_SET_ERR_MSG_MOD(extack, "Vlan's multicast processing is disabled");
714 goto out;
715 }
716 brmctx = &v->br_mcast_ctx;
717 out:
718 return brmctx;
719 }
720
br_mdb_replace_group_sg(const struct br_mdb_config * cfg,struct net_bridge_mdb_entry * mp,struct net_bridge_port_group * pg,struct net_bridge_mcast * brmctx,unsigned char flags)721 static int br_mdb_replace_group_sg(const struct br_mdb_config *cfg,
722 struct net_bridge_mdb_entry *mp,
723 struct net_bridge_port_group *pg,
724 struct net_bridge_mcast *brmctx,
725 unsigned char flags)
726 {
727 unsigned long now = jiffies;
728
729 pg->flags = flags;
730 pg->rt_protocol = cfg->rt_protocol;
731 if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
732 mod_timer(&pg->timer,
733 now + brmctx->multicast_membership_interval);
734 else
735 del_timer(&pg->timer);
736
737 br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB);
738
739 return 0;
740 }
741
br_mdb_add_group_sg(const struct br_mdb_config * cfg,struct net_bridge_mdb_entry * mp,struct net_bridge_mcast * brmctx,unsigned char flags,struct netlink_ext_ack * extack)742 static int br_mdb_add_group_sg(const struct br_mdb_config *cfg,
743 struct net_bridge_mdb_entry *mp,
744 struct net_bridge_mcast *brmctx,
745 unsigned char flags,
746 struct netlink_ext_ack *extack)
747 {
748 struct net_bridge_port_group __rcu **pp;
749 struct net_bridge_port_group *p;
750 unsigned long now = jiffies;
751
752 for (pp = &mp->ports;
753 (p = mlock_dereference(*pp, cfg->br)) != NULL;
754 pp = &p->next) {
755 if (p->key.port == cfg->p) {
756 if (!(cfg->nlflags & NLM_F_REPLACE)) {
757 NL_SET_ERR_MSG_MOD(extack, "(S, G) group is already joined by port");
758 return -EEXIST;
759 }
760 return br_mdb_replace_group_sg(cfg, mp, p, brmctx,
761 flags);
762 }
763 if ((unsigned long)p->key.port < (unsigned long)cfg->p)
764 break;
765 }
766
767 p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
768 MCAST_INCLUDE, cfg->rt_protocol, extack);
769 if (unlikely(!p))
770 return -ENOMEM;
771
772 rcu_assign_pointer(*pp, p);
773 if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
774 mod_timer(&p->timer,
775 now + brmctx->multicast_membership_interval);
776 br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB);
777
778 /* All of (*, G) EXCLUDE ports need to be added to the new (S, G) for
779 * proper replication.
780 */
781 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto)) {
782 struct net_bridge_mdb_entry *star_mp;
783 struct br_ip star_group;
784
785 star_group = p->key.addr;
786 memset(&star_group.src, 0, sizeof(star_group.src));
787 star_mp = br_mdb_ip_get(cfg->br, &star_group);
788 if (star_mp)
789 br_multicast_sg_add_exclude_ports(star_mp, p);
790 }
791
792 return 0;
793 }
794
br_mdb_add_group_src_fwd(const struct br_mdb_config * cfg,struct br_ip * src_ip,struct net_bridge_mcast * brmctx,struct netlink_ext_ack * extack)795 static int br_mdb_add_group_src_fwd(const struct br_mdb_config *cfg,
796 struct br_ip *src_ip,
797 struct net_bridge_mcast *brmctx,
798 struct netlink_ext_ack *extack)
799 {
800 struct net_bridge_mdb_entry *sgmp;
801 struct br_mdb_config sg_cfg;
802 struct br_ip sg_ip;
803 u8 flags = 0;
804
805 sg_ip = cfg->group;
806 sg_ip.src = src_ip->src;
807 sgmp = br_multicast_new_group(cfg->br, &sg_ip);
808 if (IS_ERR(sgmp)) {
809 NL_SET_ERR_MSG_MOD(extack, "Failed to add (S, G) MDB entry");
810 return PTR_ERR(sgmp);
811 }
812
813 if (cfg->entry->state == MDB_PERMANENT)
814 flags |= MDB_PG_FLAGS_PERMANENT;
815 if (cfg->filter_mode == MCAST_EXCLUDE)
816 flags |= MDB_PG_FLAGS_BLOCKED;
817
818 memset(&sg_cfg, 0, sizeof(sg_cfg));
819 sg_cfg.br = cfg->br;
820 sg_cfg.p = cfg->p;
821 sg_cfg.entry = cfg->entry;
822 sg_cfg.group = sg_ip;
823 sg_cfg.src_entry = true;
824 sg_cfg.filter_mode = MCAST_INCLUDE;
825 sg_cfg.rt_protocol = cfg->rt_protocol;
826 sg_cfg.nlflags = cfg->nlflags;
827 return br_mdb_add_group_sg(&sg_cfg, sgmp, brmctx, flags, extack);
828 }
829
br_mdb_add_group_src(const struct br_mdb_config * cfg,struct net_bridge_port_group * pg,struct net_bridge_mcast * brmctx,struct br_mdb_src_entry * src,struct netlink_ext_ack * extack)830 static int br_mdb_add_group_src(const struct br_mdb_config *cfg,
831 struct net_bridge_port_group *pg,
832 struct net_bridge_mcast *brmctx,
833 struct br_mdb_src_entry *src,
834 struct netlink_ext_ack *extack)
835 {
836 struct net_bridge_group_src *ent;
837 unsigned long now = jiffies;
838 int err;
839
840 ent = br_multicast_find_group_src(pg, &src->addr);
841 if (!ent) {
842 ent = br_multicast_new_group_src(pg, &src->addr);
843 if (!ent) {
844 NL_SET_ERR_MSG_MOD(extack, "Failed to add new source entry");
845 return -ENOSPC;
846 }
847 } else if (!(cfg->nlflags & NLM_F_REPLACE)) {
848 NL_SET_ERR_MSG_MOD(extack, "Source entry already exists");
849 return -EEXIST;
850 }
851
852 if (cfg->filter_mode == MCAST_INCLUDE &&
853 cfg->entry->state == MDB_TEMPORARY)
854 mod_timer(&ent->timer, now + br_multicast_gmi(brmctx));
855 else
856 del_timer(&ent->timer);
857
858 /* Install a (S, G) forwarding entry for the source. */
859 err = br_mdb_add_group_src_fwd(cfg, &src->addr, brmctx, extack);
860 if (err)
861 goto err_del_sg;
862
863 ent->flags = BR_SGRP_F_INSTALLED | BR_SGRP_F_USER_ADDED;
864
865 return 0;
866
867 err_del_sg:
868 __br_multicast_del_group_src(ent);
869 return err;
870 }
871
br_mdb_del_group_src(struct net_bridge_port_group * pg,struct br_mdb_src_entry * src)872 static void br_mdb_del_group_src(struct net_bridge_port_group *pg,
873 struct br_mdb_src_entry *src)
874 {
875 struct net_bridge_group_src *ent;
876
877 ent = br_multicast_find_group_src(pg, &src->addr);
878 if (WARN_ON_ONCE(!ent))
879 return;
880 br_multicast_del_group_src(ent, false);
881 }
882
br_mdb_add_group_srcs(const struct br_mdb_config * cfg,struct net_bridge_port_group * pg,struct net_bridge_mcast * brmctx,struct netlink_ext_ack * extack)883 static int br_mdb_add_group_srcs(const struct br_mdb_config *cfg,
884 struct net_bridge_port_group *pg,
885 struct net_bridge_mcast *brmctx,
886 struct netlink_ext_ack *extack)
887 {
888 int i, err;
889
890 for (i = 0; i < cfg->num_src_entries; i++) {
891 err = br_mdb_add_group_src(cfg, pg, brmctx,
892 &cfg->src_entries[i], extack);
893 if (err)
894 goto err_del_group_srcs;
895 }
896
897 return 0;
898
899 err_del_group_srcs:
900 for (i--; i >= 0; i--)
901 br_mdb_del_group_src(pg, &cfg->src_entries[i]);
902 return err;
903 }
904
br_mdb_replace_group_srcs(const struct br_mdb_config * cfg,struct net_bridge_port_group * pg,struct net_bridge_mcast * brmctx,struct netlink_ext_ack * extack)905 static int br_mdb_replace_group_srcs(const struct br_mdb_config *cfg,
906 struct net_bridge_port_group *pg,
907 struct net_bridge_mcast *brmctx,
908 struct netlink_ext_ack *extack)
909 {
910 struct net_bridge_group_src *ent;
911 struct hlist_node *tmp;
912 int err;
913
914 hlist_for_each_entry(ent, &pg->src_list, node)
915 ent->flags |= BR_SGRP_F_DELETE;
916
917 err = br_mdb_add_group_srcs(cfg, pg, brmctx, extack);
918 if (err)
919 goto err_clear_delete;
920
921 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) {
922 if (ent->flags & BR_SGRP_F_DELETE)
923 br_multicast_del_group_src(ent, false);
924 }
925
926 return 0;
927
928 err_clear_delete:
929 hlist_for_each_entry(ent, &pg->src_list, node)
930 ent->flags &= ~BR_SGRP_F_DELETE;
931 return err;
932 }
933
br_mdb_replace_group_star_g(const struct br_mdb_config * cfg,struct net_bridge_mdb_entry * mp,struct net_bridge_port_group * pg,struct net_bridge_mcast * brmctx,unsigned char flags,struct netlink_ext_ack * extack)934 static int br_mdb_replace_group_star_g(const struct br_mdb_config *cfg,
935 struct net_bridge_mdb_entry *mp,
936 struct net_bridge_port_group *pg,
937 struct net_bridge_mcast *brmctx,
938 unsigned char flags,
939 struct netlink_ext_ack *extack)
940 {
941 unsigned long now = jiffies;
942 int err;
943
944 err = br_mdb_replace_group_srcs(cfg, pg, brmctx, extack);
945 if (err)
946 return err;
947
948 pg->flags = flags;
949 pg->filter_mode = cfg->filter_mode;
950 pg->rt_protocol = cfg->rt_protocol;
951 if (!(flags & MDB_PG_FLAGS_PERMANENT) &&
952 cfg->filter_mode == MCAST_EXCLUDE)
953 mod_timer(&pg->timer,
954 now + brmctx->multicast_membership_interval);
955 else
956 del_timer(&pg->timer);
957
958 br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB);
959
960 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto))
961 br_multicast_star_g_handle_mode(pg, cfg->filter_mode);
962
963 return 0;
964 }
965
br_mdb_add_group_star_g(const struct br_mdb_config * cfg,struct net_bridge_mdb_entry * mp,struct net_bridge_mcast * brmctx,unsigned char flags,struct netlink_ext_ack * extack)966 static int br_mdb_add_group_star_g(const struct br_mdb_config *cfg,
967 struct net_bridge_mdb_entry *mp,
968 struct net_bridge_mcast *brmctx,
969 unsigned char flags,
970 struct netlink_ext_ack *extack)
971 {
972 struct net_bridge_port_group __rcu **pp;
973 struct net_bridge_port_group *p;
974 unsigned long now = jiffies;
975 int err;
976
977 for (pp = &mp->ports;
978 (p = mlock_dereference(*pp, cfg->br)) != NULL;
979 pp = &p->next) {
980 if (p->key.port == cfg->p) {
981 if (!(cfg->nlflags & NLM_F_REPLACE)) {
982 NL_SET_ERR_MSG_MOD(extack, "(*, G) group is already joined by port");
983 return -EEXIST;
984 }
985 return br_mdb_replace_group_star_g(cfg, mp, p, brmctx,
986 flags, extack);
987 }
988 if ((unsigned long)p->key.port < (unsigned long)cfg->p)
989 break;
990 }
991
992 p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
993 cfg->filter_mode, cfg->rt_protocol,
994 extack);
995 if (unlikely(!p))
996 return -ENOMEM;
997
998 err = br_mdb_add_group_srcs(cfg, p, brmctx, extack);
999 if (err)
1000 goto err_del_port_group;
1001
1002 rcu_assign_pointer(*pp, p);
1003 if (!(flags & MDB_PG_FLAGS_PERMANENT) &&
1004 cfg->filter_mode == MCAST_EXCLUDE)
1005 mod_timer(&p->timer,
1006 now + brmctx->multicast_membership_interval);
1007 br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB);
1008 /* If we are adding a new EXCLUDE port group (*, G), it needs to be
1009 * also added to all (S, G) entries for proper replication.
1010 */
1011 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto) &&
1012 cfg->filter_mode == MCAST_EXCLUDE)
1013 br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE);
1014
1015 return 0;
1016
1017 err_del_port_group:
1018 br_multicast_del_port_group(p);
1019 return err;
1020 }
1021
br_mdb_add_group(const struct br_mdb_config * cfg,struct netlink_ext_ack * extack)1022 static int br_mdb_add_group(const struct br_mdb_config *cfg,
1023 struct netlink_ext_ack *extack)
1024 {
1025 struct br_mdb_entry *entry = cfg->entry;
1026 struct net_bridge_port *port = cfg->p;
1027 struct net_bridge_mdb_entry *mp;
1028 struct net_bridge *br = cfg->br;
1029 struct net_bridge_mcast *brmctx;
1030 struct br_ip group = cfg->group;
1031 unsigned char flags = 0;
1032
1033 brmctx = __br_mdb_choose_context(br, entry, extack);
1034 if (!brmctx)
1035 return -EINVAL;
1036
1037 mp = br_multicast_new_group(br, &group);
1038 if (IS_ERR(mp))
1039 return PTR_ERR(mp);
1040
1041 /* host join */
1042 if (!port) {
1043 if (mp->host_joined) {
1044 NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host");
1045 return -EEXIST;
1046 }
1047
1048 br_multicast_host_join(brmctx, mp, false);
1049 br_mdb_notify(br->dev, mp, NULL, RTM_NEWMDB);
1050
1051 return 0;
1052 }
1053
1054 if (entry->state == MDB_PERMANENT)
1055 flags |= MDB_PG_FLAGS_PERMANENT;
1056
1057 if (br_multicast_is_star_g(&group))
1058 return br_mdb_add_group_star_g(cfg, mp, brmctx, flags, extack);
1059 else
1060 return br_mdb_add_group_sg(cfg, mp, brmctx, flags, extack);
1061 }
1062
__br_mdb_add(const struct br_mdb_config * cfg,struct netlink_ext_ack * extack)1063 static int __br_mdb_add(const struct br_mdb_config *cfg,
1064 struct netlink_ext_ack *extack)
1065 {
1066 int ret;
1067
1068 spin_lock_bh(&cfg->br->multicast_lock);
1069 ret = br_mdb_add_group(cfg, extack);
1070 spin_unlock_bh(&cfg->br->multicast_lock);
1071
1072 return ret;
1073 }
1074
br_mdb_config_src_entry_init(struct nlattr * src_entry,struct br_mdb_src_entry * src,__be16 proto,struct netlink_ext_ack * extack)1075 static int br_mdb_config_src_entry_init(struct nlattr *src_entry,
1076 struct br_mdb_src_entry *src,
1077 __be16 proto,
1078 struct netlink_ext_ack *extack)
1079 {
1080 struct nlattr *tb[MDBE_SRCATTR_MAX + 1];
1081 int err;
1082
1083 err = nla_parse_nested(tb, MDBE_SRCATTR_MAX, src_entry,
1084 br_mdbe_src_list_entry_pol, extack);
1085 if (err)
1086 return err;
1087
1088 if (NL_REQ_ATTR_CHECK(extack, src_entry, tb, MDBE_SRCATTR_ADDRESS))
1089 return -EINVAL;
1090
1091 if (!is_valid_mdb_source(tb[MDBE_SRCATTR_ADDRESS], proto, extack))
1092 return -EINVAL;
1093
1094 src->addr.proto = proto;
1095 nla_memcpy(&src->addr.src, tb[MDBE_SRCATTR_ADDRESS],
1096 nla_len(tb[MDBE_SRCATTR_ADDRESS]));
1097
1098 return 0;
1099 }
1100
br_mdb_config_src_list_init(struct nlattr * src_list,struct br_mdb_config * cfg,struct netlink_ext_ack * extack)1101 static int br_mdb_config_src_list_init(struct nlattr *src_list,
1102 struct br_mdb_config *cfg,
1103 struct netlink_ext_ack *extack)
1104 {
1105 struct nlattr *src_entry;
1106 int rem, err;
1107 int i = 0;
1108
1109 nla_for_each_nested(src_entry, src_list, rem)
1110 cfg->num_src_entries++;
1111
1112 if (cfg->num_src_entries >= PG_SRC_ENT_LIMIT) {
1113 NL_SET_ERR_MSG_FMT_MOD(extack, "Exceeded maximum number of source entries (%u)",
1114 PG_SRC_ENT_LIMIT - 1);
1115 return -EINVAL;
1116 }
1117
1118 cfg->src_entries = kcalloc(cfg->num_src_entries,
1119 sizeof(struct br_mdb_src_entry), GFP_KERNEL);
1120 if (!cfg->src_entries)
1121 return -ENOMEM;
1122
1123 nla_for_each_nested(src_entry, src_list, rem) {
1124 err = br_mdb_config_src_entry_init(src_entry,
1125 &cfg->src_entries[i],
1126 cfg->entry->addr.proto,
1127 extack);
1128 if (err)
1129 goto err_src_entry_init;
1130 i++;
1131 }
1132
1133 return 0;
1134
1135 err_src_entry_init:
1136 kfree(cfg->src_entries);
1137 return err;
1138 }
1139
br_mdb_config_src_list_fini(struct br_mdb_config * cfg)1140 static void br_mdb_config_src_list_fini(struct br_mdb_config *cfg)
1141 {
1142 kfree(cfg->src_entries);
1143 }
1144
br_mdb_config_attrs_init(struct nlattr * set_attrs,struct br_mdb_config * cfg,struct netlink_ext_ack * extack)1145 static int br_mdb_config_attrs_init(struct nlattr *set_attrs,
1146 struct br_mdb_config *cfg,
1147 struct netlink_ext_ack *extack)
1148 {
1149 struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
1150 int err;
1151
1152 err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX, set_attrs,
1153 br_mdbe_attrs_pol, extack);
1154 if (err)
1155 return err;
1156
1157 if (mdb_attrs[MDBE_ATTR_SOURCE] &&
1158 !is_valid_mdb_source(mdb_attrs[MDBE_ATTR_SOURCE],
1159 cfg->entry->addr.proto, extack))
1160 return -EINVAL;
1161
1162 __mdb_entry_to_br_ip(cfg->entry, &cfg->group, mdb_attrs);
1163
1164 if (mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
1165 if (!cfg->p) {
1166 NL_SET_ERR_MSG_MOD(extack, "Filter mode cannot be set for host groups");
1167 return -EINVAL;
1168 }
1169 if (!br_multicast_is_star_g(&cfg->group)) {
1170 NL_SET_ERR_MSG_MOD(extack, "Filter mode can only be set for (*, G) entries");
1171 return -EINVAL;
1172 }
1173 cfg->filter_mode = nla_get_u8(mdb_attrs[MDBE_ATTR_GROUP_MODE]);
1174 } else {
1175 cfg->filter_mode = MCAST_EXCLUDE;
1176 }
1177
1178 if (mdb_attrs[MDBE_ATTR_SRC_LIST]) {
1179 if (!cfg->p) {
1180 NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set for host groups");
1181 return -EINVAL;
1182 }
1183 if (!br_multicast_is_star_g(&cfg->group)) {
1184 NL_SET_ERR_MSG_MOD(extack, "Source list can only be set for (*, G) entries");
1185 return -EINVAL;
1186 }
1187 if (!mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
1188 NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set without filter mode");
1189 return -EINVAL;
1190 }
1191 err = br_mdb_config_src_list_init(mdb_attrs[MDBE_ATTR_SRC_LIST],
1192 cfg, extack);
1193 if (err)
1194 return err;
1195 }
1196
1197 if (!cfg->num_src_entries && cfg->filter_mode == MCAST_INCLUDE) {
1198 NL_SET_ERR_MSG_MOD(extack, "Cannot add (*, G) INCLUDE with an empty source list");
1199 return -EINVAL;
1200 }
1201
1202 if (mdb_attrs[MDBE_ATTR_RTPROT]) {
1203 if (!cfg->p) {
1204 NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be set for host groups");
1205 return -EINVAL;
1206 }
1207 cfg->rt_protocol = nla_get_u8(mdb_attrs[MDBE_ATTR_RTPROT]);
1208 }
1209
1210 return 0;
1211 }
1212
br_mdb_config_init(struct br_mdb_config * cfg,struct net_device * dev,struct nlattr * tb[],u16 nlmsg_flags,struct netlink_ext_ack * extack)1213 static int br_mdb_config_init(struct br_mdb_config *cfg, struct net_device *dev,
1214 struct nlattr *tb[], u16 nlmsg_flags,
1215 struct netlink_ext_ack *extack)
1216 {
1217 struct net *net = dev_net(dev);
1218
1219 memset(cfg, 0, sizeof(*cfg));
1220 cfg->filter_mode = MCAST_EXCLUDE;
1221 cfg->rt_protocol = RTPROT_STATIC;
1222 cfg->nlflags = nlmsg_flags;
1223
1224 cfg->br = netdev_priv(dev);
1225
1226 if (!netif_running(cfg->br->dev)) {
1227 NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running");
1228 return -EINVAL;
1229 }
1230
1231 if (!br_opt_get(cfg->br, BROPT_MULTICAST_ENABLED)) {
1232 NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled");
1233 return -EINVAL;
1234 }
1235
1236 cfg->entry = nla_data(tb[MDBA_SET_ENTRY]);
1237
1238 if (cfg->entry->ifindex != cfg->br->dev->ifindex) {
1239 struct net_device *pdev;
1240
1241 pdev = __dev_get_by_index(net, cfg->entry->ifindex);
1242 if (!pdev) {
1243 NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist");
1244 return -ENODEV;
1245 }
1246
1247 cfg->p = br_port_get_rtnl(pdev);
1248 if (!cfg->p) {
1249 NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port");
1250 return -EINVAL;
1251 }
1252
1253 if (cfg->p->br != cfg->br) {
1254 NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device");
1255 return -EINVAL;
1256 }
1257 }
1258
1259 if (cfg->entry->addr.proto == htons(ETH_P_IP) &&
1260 ipv4_is_zeronet(cfg->entry->addr.u.ip4)) {
1261 NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address 0.0.0.0 is not allowed");
1262 return -EINVAL;
1263 }
1264
1265 if (tb[MDBA_SET_ENTRY_ATTRS])
1266 return br_mdb_config_attrs_init(tb[MDBA_SET_ENTRY_ATTRS], cfg,
1267 extack);
1268 else
1269 __mdb_entry_to_br_ip(cfg->entry, &cfg->group, NULL);
1270
1271 return 0;
1272 }
1273
br_mdb_config_fini(struct br_mdb_config * cfg)1274 static void br_mdb_config_fini(struct br_mdb_config *cfg)
1275 {
1276 br_mdb_config_src_list_fini(cfg);
1277 }
1278
br_mdb_add(struct net_device * dev,struct nlattr * tb[],u16 nlmsg_flags,struct netlink_ext_ack * extack)1279 int br_mdb_add(struct net_device *dev, struct nlattr *tb[], u16 nlmsg_flags,
1280 struct netlink_ext_ack *extack)
1281 {
1282 struct net_bridge_vlan_group *vg;
1283 struct net_bridge_vlan *v;
1284 struct br_mdb_config cfg;
1285 int err;
1286
1287 err = br_mdb_config_init(&cfg, dev, tb, nlmsg_flags, extack);
1288 if (err)
1289 return err;
1290
1291 err = -EINVAL;
1292 /* host join errors which can happen before creating the group */
1293 if (!cfg.p && !br_group_is_l2(&cfg.group)) {
1294 /* don't allow any flags for host-joined IP groups */
1295 if (cfg.entry->state) {
1296 NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups");
1297 goto out;
1298 }
1299 if (!br_multicast_is_star_g(&cfg.group)) {
1300 NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined");
1301 goto out;
1302 }
1303 }
1304
1305 if (br_group_is_l2(&cfg.group) && cfg.entry->state != MDB_PERMANENT) {
1306 NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed");
1307 goto out;
1308 }
1309
1310 if (cfg.p) {
1311 if (cfg.p->state == BR_STATE_DISABLED && cfg.entry->state != MDB_PERMANENT) {
1312 NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state and entry is not permanent");
1313 goto out;
1314 }
1315 vg = nbp_vlan_group(cfg.p);
1316 } else {
1317 vg = br_vlan_group(cfg.br);
1318 }
1319
1320 /* If vlan filtering is enabled and VLAN is not specified
1321 * install mdb entry on all vlans configured on the port.
1322 */
1323 if (br_vlan_enabled(cfg.br->dev) && vg && cfg.entry->vid == 0) {
1324 list_for_each_entry(v, &vg->vlan_list, vlist) {
1325 cfg.entry->vid = v->vid;
1326 cfg.group.vid = v->vid;
1327 err = __br_mdb_add(&cfg, extack);
1328 if (err)
1329 break;
1330 }
1331 } else {
1332 err = __br_mdb_add(&cfg, extack);
1333 }
1334
1335 out:
1336 br_mdb_config_fini(&cfg);
1337 return err;
1338 }
1339
__br_mdb_del(const struct br_mdb_config * cfg)1340 static int __br_mdb_del(const struct br_mdb_config *cfg)
1341 {
1342 struct br_mdb_entry *entry = cfg->entry;
1343 struct net_bridge *br = cfg->br;
1344 struct net_bridge_mdb_entry *mp;
1345 struct net_bridge_port_group *p;
1346 struct net_bridge_port_group __rcu **pp;
1347 struct br_ip ip = cfg->group;
1348 int err = -EINVAL;
1349
1350 spin_lock_bh(&br->multicast_lock);
1351 mp = br_mdb_ip_get(br, &ip);
1352 if (!mp)
1353 goto unlock;
1354
1355 /* host leave */
1356 if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) {
1357 br_multicast_host_leave(mp, false);
1358 err = 0;
1359 br_mdb_notify(br->dev, mp, NULL, RTM_DELMDB);
1360 if (!mp->ports && netif_running(br->dev))
1361 mod_timer(&mp->timer, jiffies);
1362 goto unlock;
1363 }
1364
1365 for (pp = &mp->ports;
1366 (p = mlock_dereference(*pp, br)) != NULL;
1367 pp = &p->next) {
1368 if (!p->key.port || p->key.port->dev->ifindex != entry->ifindex)
1369 continue;
1370
1371 br_multicast_del_pg(mp, p, pp);
1372 err = 0;
1373 break;
1374 }
1375
1376 unlock:
1377 spin_unlock_bh(&br->multicast_lock);
1378 return err;
1379 }
1380
br_mdb_del(struct net_device * dev,struct nlattr * tb[],struct netlink_ext_ack * extack)1381 int br_mdb_del(struct net_device *dev, struct nlattr *tb[],
1382 struct netlink_ext_ack *extack)
1383 {
1384 struct net_bridge_vlan_group *vg;
1385 struct net_bridge_vlan *v;
1386 struct br_mdb_config cfg;
1387 int err;
1388
1389 err = br_mdb_config_init(&cfg, dev, tb, 0, extack);
1390 if (err)
1391 return err;
1392
1393 if (cfg.p)
1394 vg = nbp_vlan_group(cfg.p);
1395 else
1396 vg = br_vlan_group(cfg.br);
1397
1398 /* If vlan filtering is enabled and VLAN is not specified
1399 * delete mdb entry on all vlans configured on the port.
1400 */
1401 if (br_vlan_enabled(cfg.br->dev) && vg && cfg.entry->vid == 0) {
1402 list_for_each_entry(v, &vg->vlan_list, vlist) {
1403 cfg.entry->vid = v->vid;
1404 cfg.group.vid = v->vid;
1405 err = __br_mdb_del(&cfg);
1406 }
1407 } else {
1408 err = __br_mdb_del(&cfg);
1409 }
1410
1411 br_mdb_config_fini(&cfg);
1412 return err;
1413 }
1414
1415 struct br_mdb_flush_desc {
1416 u32 port_ifindex;
1417 u16 vid;
1418 u8 rt_protocol;
1419 u8 state;
1420 u8 state_mask;
1421 };
1422
1423 static const struct nla_policy br_mdbe_attrs_del_bulk_pol[MDBE_ATTR_MAX + 1] = {
1424 [MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
1425 [MDBE_ATTR_STATE_MASK] = NLA_POLICY_MASK(NLA_U8, MDB_PERMANENT),
1426 };
1427
br_mdb_flush_desc_init(struct br_mdb_flush_desc * desc,struct nlattr * tb[],struct netlink_ext_ack * extack)1428 static int br_mdb_flush_desc_init(struct br_mdb_flush_desc *desc,
1429 struct nlattr *tb[],
1430 struct netlink_ext_ack *extack)
1431 {
1432 struct br_mdb_entry *entry = nla_data(tb[MDBA_SET_ENTRY]);
1433 struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
1434 int err;
1435
1436 desc->port_ifindex = entry->ifindex;
1437 desc->vid = entry->vid;
1438 desc->state = entry->state;
1439
1440 if (!tb[MDBA_SET_ENTRY_ATTRS])
1441 return 0;
1442
1443 err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
1444 tb[MDBA_SET_ENTRY_ATTRS],
1445 br_mdbe_attrs_del_bulk_pol, extack);
1446 if (err)
1447 return err;
1448
1449 if (mdbe_attrs[MDBE_ATTR_STATE_MASK])
1450 desc->state_mask = nla_get_u8(mdbe_attrs[MDBE_ATTR_STATE_MASK]);
1451
1452 if (mdbe_attrs[MDBE_ATTR_RTPROT])
1453 desc->rt_protocol = nla_get_u8(mdbe_attrs[MDBE_ATTR_RTPROT]);
1454
1455 return 0;
1456 }
1457
br_mdb_flush_host(struct net_bridge * br,struct net_bridge_mdb_entry * mp,const struct br_mdb_flush_desc * desc)1458 static void br_mdb_flush_host(struct net_bridge *br,
1459 struct net_bridge_mdb_entry *mp,
1460 const struct br_mdb_flush_desc *desc)
1461 {
1462 u8 state;
1463
1464 if (desc->port_ifindex && desc->port_ifindex != br->dev->ifindex)
1465 return;
1466
1467 if (desc->rt_protocol)
1468 return;
1469
1470 state = br_group_is_l2(&mp->addr) ? MDB_PERMANENT : 0;
1471 if (desc->state_mask && (state & desc->state_mask) != desc->state)
1472 return;
1473
1474 br_multicast_host_leave(mp, true);
1475 if (!mp->ports && netif_running(br->dev))
1476 mod_timer(&mp->timer, jiffies);
1477 }
1478
br_mdb_flush_pgs(struct net_bridge * br,struct net_bridge_mdb_entry * mp,const struct br_mdb_flush_desc * desc)1479 static void br_mdb_flush_pgs(struct net_bridge *br,
1480 struct net_bridge_mdb_entry *mp,
1481 const struct br_mdb_flush_desc *desc)
1482 {
1483 struct net_bridge_port_group __rcu **pp;
1484 struct net_bridge_port_group *p;
1485
1486 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;) {
1487 u8 state;
1488
1489 if (desc->port_ifindex &&
1490 desc->port_ifindex != p->key.port->dev->ifindex) {
1491 pp = &p->next;
1492 continue;
1493 }
1494
1495 if (desc->rt_protocol && desc->rt_protocol != p->rt_protocol) {
1496 pp = &p->next;
1497 continue;
1498 }
1499
1500 state = p->flags & MDB_PG_FLAGS_PERMANENT ? MDB_PERMANENT : 0;
1501 if (desc->state_mask &&
1502 (state & desc->state_mask) != desc->state) {
1503 pp = &p->next;
1504 continue;
1505 }
1506
1507 br_multicast_del_pg(mp, p, pp);
1508 }
1509 }
1510
br_mdb_flush(struct net_bridge * br,const struct br_mdb_flush_desc * desc)1511 static void br_mdb_flush(struct net_bridge *br,
1512 const struct br_mdb_flush_desc *desc)
1513 {
1514 struct net_bridge_mdb_entry *mp;
1515
1516 spin_lock_bh(&br->multicast_lock);
1517
1518 /* Safe variant is not needed because entries are removed from the list
1519 * upon group timer expiration or bridge deletion.
1520 */
1521 hlist_for_each_entry(mp, &br->mdb_list, mdb_node) {
1522 if (desc->vid && desc->vid != mp->addr.vid)
1523 continue;
1524
1525 br_mdb_flush_host(br, mp, desc);
1526 br_mdb_flush_pgs(br, mp, desc);
1527 }
1528
1529 spin_unlock_bh(&br->multicast_lock);
1530 }
1531
br_mdb_del_bulk(struct net_device * dev,struct nlattr * tb[],struct netlink_ext_ack * extack)1532 int br_mdb_del_bulk(struct net_device *dev, struct nlattr *tb[],
1533 struct netlink_ext_ack *extack)
1534 {
1535 struct net_bridge *br = netdev_priv(dev);
1536 struct br_mdb_flush_desc desc = {};
1537 int err;
1538
1539 err = br_mdb_flush_desc_init(&desc, tb, extack);
1540 if (err)
1541 return err;
1542
1543 br_mdb_flush(br, &desc);
1544
1545 return 0;
1546 }
1547
1548 static const struct nla_policy br_mdbe_attrs_get_pol[MDBE_ATTR_MAX + 1] = {
1549 [MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
1550 sizeof(struct in_addr),
1551 sizeof(struct in6_addr)),
1552 };
1553
br_mdb_get_parse(struct net_device * dev,struct nlattr * tb[],struct br_ip * group,struct netlink_ext_ack * extack)1554 static int br_mdb_get_parse(struct net_device *dev, struct nlattr *tb[],
1555 struct br_ip *group, struct netlink_ext_ack *extack)
1556 {
1557 struct br_mdb_entry *entry = nla_data(tb[MDBA_GET_ENTRY]);
1558 struct nlattr *mdbe_attrs[MDBE_ATTR_MAX + 1];
1559 int err;
1560
1561 if (!tb[MDBA_GET_ENTRY_ATTRS]) {
1562 __mdb_entry_to_br_ip(entry, group, NULL);
1563 return 0;
1564 }
1565
1566 err = nla_parse_nested(mdbe_attrs, MDBE_ATTR_MAX,
1567 tb[MDBA_GET_ENTRY_ATTRS], br_mdbe_attrs_get_pol,
1568 extack);
1569 if (err)
1570 return err;
1571
1572 if (mdbe_attrs[MDBE_ATTR_SOURCE] &&
1573 !is_valid_mdb_source(mdbe_attrs[MDBE_ATTR_SOURCE],
1574 entry->addr.proto, extack))
1575 return -EINVAL;
1576
1577 __mdb_entry_to_br_ip(entry, group, mdbe_attrs);
1578
1579 return 0;
1580 }
1581
1582 static struct sk_buff *
br_mdb_get_reply_alloc(const struct net_bridge_mdb_entry * mp)1583 br_mdb_get_reply_alloc(const struct net_bridge_mdb_entry *mp)
1584 {
1585 struct net_bridge_port_group *pg;
1586 size_t nlmsg_size;
1587
1588 nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
1589 /* MDBA_MDB */
1590 nla_total_size(0) +
1591 /* MDBA_MDB_ENTRY */
1592 nla_total_size(0);
1593
1594 if (mp->host_joined)
1595 nlmsg_size += rtnl_mdb_nlmsg_pg_size(NULL);
1596
1597 for (pg = mlock_dereference(mp->ports, mp->br); pg;
1598 pg = mlock_dereference(pg->next, mp->br))
1599 nlmsg_size += rtnl_mdb_nlmsg_pg_size(pg);
1600
1601 return nlmsg_new(nlmsg_size, GFP_ATOMIC);
1602 }
1603
br_mdb_get_reply_fill(struct sk_buff * skb,struct net_bridge_mdb_entry * mp,u32 portid,u32 seq)1604 static int br_mdb_get_reply_fill(struct sk_buff *skb,
1605 struct net_bridge_mdb_entry *mp, u32 portid,
1606 u32 seq)
1607 {
1608 struct nlattr *mdb_nest, *mdb_entry_nest;
1609 struct net_bridge_port_group *pg;
1610 struct br_port_msg *bpm;
1611 struct nlmsghdr *nlh;
1612 int err;
1613
1614 nlh = nlmsg_put(skb, portid, seq, RTM_NEWMDB, sizeof(*bpm), 0);
1615 if (!nlh)
1616 return -EMSGSIZE;
1617
1618 bpm = nlmsg_data(nlh);
1619 memset(bpm, 0, sizeof(*bpm));
1620 bpm->family = AF_BRIDGE;
1621 bpm->ifindex = mp->br->dev->ifindex;
1622 mdb_nest = nla_nest_start_noflag(skb, MDBA_MDB);
1623 if (!mdb_nest) {
1624 err = -EMSGSIZE;
1625 goto cancel;
1626 }
1627 mdb_entry_nest = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
1628 if (!mdb_entry_nest) {
1629 err = -EMSGSIZE;
1630 goto cancel;
1631 }
1632
1633 if (mp->host_joined) {
1634 err = __mdb_fill_info(skb, mp, NULL);
1635 if (err)
1636 goto cancel;
1637 }
1638
1639 for (pg = mlock_dereference(mp->ports, mp->br); pg;
1640 pg = mlock_dereference(pg->next, mp->br)) {
1641 err = __mdb_fill_info(skb, mp, pg);
1642 if (err)
1643 goto cancel;
1644 }
1645
1646 nla_nest_end(skb, mdb_entry_nest);
1647 nla_nest_end(skb, mdb_nest);
1648 nlmsg_end(skb, nlh);
1649
1650 return 0;
1651
1652 cancel:
1653 nlmsg_cancel(skb, nlh);
1654 return err;
1655 }
1656
br_mdb_get(struct net_device * dev,struct nlattr * tb[],u32 portid,u32 seq,struct netlink_ext_ack * extack)1657 int br_mdb_get(struct net_device *dev, struct nlattr *tb[], u32 portid, u32 seq,
1658 struct netlink_ext_ack *extack)
1659 {
1660 struct net_bridge *br = netdev_priv(dev);
1661 struct net_bridge_mdb_entry *mp;
1662 struct sk_buff *skb;
1663 struct br_ip group;
1664 int err;
1665
1666 err = br_mdb_get_parse(dev, tb, &group, extack);
1667 if (err)
1668 return err;
1669
1670 /* Hold the multicast lock to ensure that the MDB entry does not change
1671 * between the time the reply size is determined and when the reply is
1672 * filled in.
1673 */
1674 spin_lock_bh(&br->multicast_lock);
1675
1676 mp = br_mdb_ip_get(br, &group);
1677 if (!mp || (!mp->ports && !mp->host_joined)) {
1678 NL_SET_ERR_MSG_MOD(extack, "MDB entry not found");
1679 err = -ENOENT;
1680 goto unlock;
1681 }
1682
1683 skb = br_mdb_get_reply_alloc(mp);
1684 if (!skb) {
1685 err = -ENOMEM;
1686 goto unlock;
1687 }
1688
1689 err = br_mdb_get_reply_fill(skb, mp, portid, seq);
1690 if (err) {
1691 NL_SET_ERR_MSG_MOD(extack, "Failed to fill MDB get reply");
1692 goto free;
1693 }
1694
1695 spin_unlock_bh(&br->multicast_lock);
1696
1697 return rtnl_unicast(skb, dev_net(dev), portid);
1698
1699 free:
1700 kfree_skb(skb);
1701 unlock:
1702 spin_unlock_bh(&br->multicast_lock);
1703 return err;
1704 }
1705