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Merge tag 'riscv/for-v5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv...
[linux-2.6-block.git] / net / bridge / br_mdb.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
ee07c6e7
CW		 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>
cfd56754 8#include <linux/if_ether.h>
ee07c6e7
CW		 9#include <net/ip.h>
10#include <net/netlink.h>
f1fecb1d 11#include <net/switchdev.h>
ee07c6e7
CW		 12#if IS_ENABLED(CONFIG_IPV6)
13#include <net/ipv6.h>
3c3769e6 14#include <net/addrconf.h>
ee07c6e7
CW		 15#endif
16
17#include "br_private.h"
18
19static 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;
59f78f9f 24 struct nlattr *nest, *port_nest;
ee07c6e7
CW		 25
26 if (!br->multicast_router || hlist_empty(&br->router_list))
27 return 0;
28
ae0be8de 29 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
ee07c6e7
CW		 30 if (nest == NULL)
31 return -EMSGSIZE;
32
b67bfe0d 33 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
59f78f9f
NA		 34 if (!p)
35 continue;
ae0be8de 36 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
59f78f9f 37 if (!port_nest)
ee07c6e7 38 goto fail;
59f78f9f
NA		 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);
ee07c6e7
CW		 48 }
49
50 nla_nest_end(skb, nest);
51 return 0;
52fail:
53 nla_nest_cancel(skb, nest);
54 return -EMSGSIZE;
55}
56
9d06b6d8
ER		 57static 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
6dd684c0
ER		 65static 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
ee07c6e7
CW		 78static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
79 struct net_device *dev)
80{
19e3a9c9 81 int idx = 0, s_idx = cb->args[1], err = 0;
ee07c6e7 82 struct net_bridge *br = netdev_priv(dev);
19e3a9c9 83 struct net_bridge_mdb_entry *mp;
ee07c6e7 84 struct nlattr *nest, *nest2;
ee07c6e7 85
13cefad2 86 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
ee07c6e7
CW		 87 return 0;
88
ae0be8de 89 nest = nla_nest_start_noflag(skb, MDBA_MDB);
ee07c6e7
CW		 90 if (nest == NULL)
91 return -EMSGSIZE;
92
19e3a9c9 93 hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
762a3d89 94 struct net_bridge_port_group *p;
95 struct net_bridge_port_group __rcu **pp;
ee07c6e7
CW		 96 struct net_bridge_port *port;
97
19e3a9c9
NA		 98 if (idx < s_idx)
99 goto skip;
ee07c6e7 100
ae0be8de 101 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
19e3a9c9
NA		 102 if (!nest2) {
103 err = -EMSGSIZE;
104 break;
105 }
ee07c6e7 106
19e3a9c9
NA		 107 for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
108 pp = &p->next) {
109 struct nlattr *nest_ent;
110 struct br_mdb_entry e;
111
112 port = p->port;
113 if (!port)
114 continue;
115
116 memset(&e, 0, sizeof(e));
117 e.ifindex = port->dev->ifindex;
118 e.vid = p->addr.vid;
119 __mdb_entry_fill_flags(&e, p->flags);
120 if (p->addr.proto == htons(ETH_P_IP))
121 e.addr.u.ip4 = p->addr.u.ip4;
ee07c6e7 122#if IS_ENABLED(CONFIG_IPV6)
19e3a9c9
NA		 123 if (p->addr.proto == htons(ETH_P_IPV6))
124 e.addr.u.ip6 = p->addr.u.ip6;
ee07c6e7 125#endif
19e3a9c9 126 e.addr.proto = p->addr.proto;
ae0be8de
MK		 127 nest_ent = nla_nest_start_noflag(skb,
128 MDBA_MDB_ENTRY_INFO);
19e3a9c9
NA		 129 if (!nest_ent) {
130 nla_nest_cancel(skb, nest2);
131 err = -EMSGSIZE;
132 goto out;
ee07c6e7 133 }
19e3a9c9
NA		 134 if (nla_put_nohdr(skb, sizeof(e), &e) ||
135 nla_put_u32(skb,
136 MDBA_MDB_EATTR_TIMER,
137 br_timer_value(&p->timer))) {
138 nla_nest_cancel(skb, nest_ent);
139 nla_nest_cancel(skb, nest2);
140 err = -EMSGSIZE;
141 goto out;
142 }
143 nla_nest_end(skb, nest_ent);
ee07c6e7 144 }
19e3a9c9
NA		 145 nla_nest_end(skb, nest2);
146skip:
147 idx++;
ee07c6e7
CW		 148 }
149
150out:
151 cb->args[1] = idx;
152 nla_nest_end(skb, nest);
153 return err;
154}
155
c77b9364
DA		 156static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh,
157 struct netlink_ext_ack *extack)
158{
159 struct br_port_msg *bpm;
160
161 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
162 NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
163 return -EINVAL;
164 }
165
166 bpm = nlmsg_data(nlh);
167 if (bpm->ifindex) {
168 NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
169 return -EINVAL;
170 }
171 if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
172 NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
173 return -EINVAL;
174 }
175
176 return 0;
177}
178
ee07c6e7
CW		 179static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
180{
181 struct net_device *dev;
182 struct net *net = sock_net(skb->sk);
183 struct nlmsghdr *nlh = NULL;
184 int idx = 0, s_idx;
185
c77b9364
DA		 186 if (cb->strict_check) {
187 int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
188
189 if (err < 0)
190 return err;
191 }
192
ee07c6e7
CW		 193 s_idx = cb->args[0];
194
195 rcu_read_lock();
196
19e3a9c9 197 cb->seq = net->dev_base_seq;
ee07c6e7
CW		 198
199 for_each_netdev_rcu(net, dev) {
200 if (dev->priv_flags & IFF_EBRIDGE) {
201 struct br_port_msg *bpm;
202
203 if (idx < s_idx)
204 goto skip;
205
206 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
207 cb->nlh->nlmsg_seq, RTM_GETMDB,
208 sizeof(*bpm), NLM_F_MULTI);
209 if (nlh == NULL)
210 break;
211
212 bpm = nlmsg_data(nlh);
c085c499 213 memset(bpm, 0, sizeof(*bpm));
ee07c6e7
CW		 214 bpm->ifindex = dev->ifindex;
215 if (br_mdb_fill_info(skb, cb, dev) < 0)
216 goto out;
217 if (br_rports_fill_info(skb, cb, dev) < 0)
218 goto out;
219
220 cb->args[1] = 0;
221 nlmsg_end(skb, nlh);
222 skip:
223 idx++;
224 }
225 }
226
227out:
228 if (nlh)
229 nlmsg_end(skb, nlh);
230 rcu_read_unlock();
231 cb->args[0] = idx;
232 return skb->len;
233}
234
37a393bc
CW		 235static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
236 struct net_device *dev,
237 struct br_mdb_entry *entry, u32 pid,
238 u32 seq, int type, unsigned int flags)
239{
240 struct nlmsghdr *nlh;
241 struct br_port_msg *bpm;
242 struct nlattr *nest, *nest2;
243
82199679 244 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
37a393bc
CW		 245 if (!nlh)
246 return -EMSGSIZE;
247
248 bpm = nlmsg_data(nlh);
c085c499 249 memset(bpm, 0, sizeof(*bpm));
37a393bc
CW		 250 bpm->family = AF_BRIDGE;
251 bpm->ifindex = dev->ifindex;
ae0be8de 252 nest = nla_nest_start_noflag(skb, MDBA_MDB);
37a393bc
CW		 253 if (nest == NULL)
254 goto cancel;
ae0be8de 255 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
37a393bc
CW		 256 if (nest2 == NULL)
257 goto end;
258
259 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
260 goto end;
261
262 nla_nest_end(skb, nest2);
263 nla_nest_end(skb, nest);
053c095a
JB		 264 nlmsg_end(skb, nlh);
265 return 0;
37a393bc
CW		 266
267end:
268 nla_nest_end(skb, nest);
269cancel:
270 nlmsg_cancel(skb, nlh);
271 return -EMSGSIZE;
272}
273
274static inline size_t rtnl_mdb_nlmsg_size(void)
275{
276 return NLMSG_ALIGN(sizeof(struct br_port_msg))
277 + nla_total_size(sizeof(struct br_mdb_entry));
278}
279
45ebcce5
ER		 280struct br_mdb_complete_info {
281 struct net_bridge_port *port;
282 struct br_ip ip;
283};
284
285static void br_mdb_complete(struct net_device *dev, int err, void *priv)
37a393bc 286{
45ebcce5
ER		 287 struct br_mdb_complete_info *data = priv;
288 struct net_bridge_port_group __rcu **pp;
289 struct net_bridge_port_group *p;
45ebcce5
ER		 290 struct net_bridge_mdb_entry *mp;
291 struct net_bridge_port *port = data->port;
292 struct net_bridge *br = port->br;
293
294 if (err)
295 goto err;
296
297 spin_lock_bh(&br->multicast_lock);
19e3a9c9 298 mp = br_mdb_ip_get(br, &data->ip);
45ebcce5
ER		 299 if (!mp)
300 goto out;
301 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
302 pp = &p->next) {
303 if (p->port != port)
304 continue;
305 p->flags |= MDB_PG_FLAGS_OFFLOAD;
306 }
307out:
308 spin_unlock_bh(&br->multicast_lock);
309err:
310 kfree(priv);
311}
312
47d5b6db
AL		 313static void br_mdb_switchdev_host_port(struct net_device *dev,
314 struct net_device *lower_dev,
315 struct br_mdb_entry *entry, int type)
316{
317 struct switchdev_obj_port_mdb mdb = {
318 .obj = {
319 .id = SWITCHDEV_OBJ_ID_HOST_MDB,
320 .flags = SWITCHDEV_F_DEFER,
321 },
322 .vid = entry->vid,
323 };
324
325 if (entry->addr.proto == htons(ETH_P_IP))
326 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
327#if IS_ENABLED(CONFIG_IPV6)
328 else
329 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
330#endif
331
332 mdb.obj.orig_dev = dev;
333 switch (type) {
334 case RTM_NEWMDB:
69b7320e 335 switchdev_port_obj_add(lower_dev, &mdb.obj, NULL);
47d5b6db
AL		 336 break;
337 case RTM_DELMDB:
338 switchdev_port_obj_del(lower_dev, &mdb.obj);
339 break;
340 }
341}
342
343static void br_mdb_switchdev_host(struct net_device *dev,
344 struct br_mdb_entry *entry, int type)
345{
346 struct net_device *lower_dev;
347 struct list_head *iter;
348
349 netdev_for_each_lower_dev(dev, lower_dev, iter)
350 br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
351}
352
45ebcce5
ER		 353static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
354 struct br_mdb_entry *entry, int type)
355{
356 struct br_mdb_complete_info *complete_info;
f1fecb1d
ER		 357 struct switchdev_obj_port_mdb mdb = {
358 .obj = {
359 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
360 .flags = SWITCHDEV_F_DEFER,
361 },
362 .vid = entry->vid,
363 };
364 struct net_device *port_dev;
37a393bc
CW		 365 struct net *net = dev_net(dev);
366 struct sk_buff *skb;
367 int err = -ENOBUFS;
368
f1fecb1d
ER		 369 port_dev = __dev_get_by_index(net, entry->ifindex);
370 if (entry->addr.proto == htons(ETH_P_IP))
371 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
372#if IS_ENABLED(CONFIG_IPV6)
373 else
374 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
375#endif
376
377 mdb.obj.orig_dev = port_dev;
2a26028d 378 if (p && port_dev && type == RTM_NEWMDB) {
45ebcce5
ER		 379 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
380 if (complete_info) {
381 complete_info->port = p;
382 __mdb_entry_to_br_ip(entry, &complete_info->ip);
383 mdb.obj.complete_priv = complete_info;
384 mdb.obj.complete = br_mdb_complete;
69b7320e 385 if (switchdev_port_obj_add(port_dev, &mdb.obj, NULL))
1bfb1596 386 kfree(complete_info);
45ebcce5 387 }
2a26028d 388 } else if (p && port_dev && type == RTM_DELMDB) {
f1fecb1d 389 switchdev_port_obj_del(port_dev, &mdb.obj);
9e8430f8 390 }
f1fecb1d 391
47d5b6db
AL		 392 if (!p)
393 br_mdb_switchdev_host(dev, entry, type);
394
37a393bc
CW		 395 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
396 if (!skb)
397 goto errout;
398
399 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
400 if (err < 0) {
401 kfree_skb(skb);
402 goto errout;
403 }
404
405 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
406 return;
407errout:
408 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
409}
410
45ebcce5
ER		 411void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
412 struct br_ip *group, int type, u8 flags)
37a393bc
CW		 413{
414 struct br_mdb_entry entry;
415
c085c499 416 memset(&entry, 0, sizeof(entry));
2a26028d
AL		 417 if (port)
418 entry.ifindex = port->dev->ifindex;
419 else
420 entry.ifindex = dev->ifindex;
45ebcce5
ER		 421 entry.addr.proto = group->proto;
422 entry.addr.u.ip4 = group->u.ip4;
37a393bc 423#if IS_ENABLED(CONFIG_IPV6)
45ebcce5 424 entry.addr.u.ip6 = group->u.ip6;
37a393bc 425#endif
45ebcce5
ER		 426 entry.vid = group->vid;
427 __mdb_entry_fill_flags(&entry, flags);
428 __br_mdb_notify(dev, port, &entry, type);
37a393bc
CW		 429}
430
949f1e39
SA		 431static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
432 struct net_device *dev,
433 int ifindex, u32 pid,
434 u32 seq, int type, unsigned int flags)
435{
436 struct br_port_msg *bpm;
437 struct nlmsghdr *nlh;
438 struct nlattr *nest;
439
94a72b3f 440 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
949f1e39
SA		 441 if (!nlh)
442 return -EMSGSIZE;
443
444 bpm = nlmsg_data(nlh);
445 memset(bpm, 0, sizeof(*bpm));
446 bpm->family = AF_BRIDGE;
447 bpm->ifindex = dev->ifindex;
ae0be8de 448 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
949f1e39
SA		 449 if (!nest)
450 goto cancel;
451
452 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
453 goto end;
454
455 nla_nest_end(skb, nest);
456 nlmsg_end(skb, nlh);
457 return 0;
458
459end:
460 nla_nest_end(skb, nest);
461cancel:
462 nlmsg_cancel(skb, nlh);
463 return -EMSGSIZE;
464}
465
466static inline size_t rtnl_rtr_nlmsg_size(void)
467{
468 return NLMSG_ALIGN(sizeof(struct br_port_msg))
469 + nla_total_size(sizeof(__u32));
470}
471
472void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
473 int type)
474{
475 struct net *net = dev_net(dev);
476 struct sk_buff *skb;
477 int err = -ENOBUFS;
478 int ifindex;
479
480 ifindex = port ? port->dev->ifindex : 0;
481 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
482 if (!skb)
483 goto errout;
484
485 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
486 if (err < 0) {
487 kfree_skb(skb);
488 goto errout;
489 }
490
491 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
492 return;
493
494errout:
495 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
496}
497
cfd56754
CW		 498static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
499{
500 if (entry->ifindex == 0)
501 return false;
502
503 if (entry->addr.proto == htons(ETH_P_IP)) {
504 if (!ipv4_is_multicast(entry->addr.u.ip4))
505 return false;
506 if (ipv4_is_local_multicast(entry->addr.u.ip4))
507 return false;
508#if IS_ENABLED(CONFIG_IPV6)
509 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
3c3769e6 510 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
cfd56754
CW		 511 return false;
512#endif
513 } else
514 return false;
ccb1c31a
AW		 515 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
516 return false;
74fe61f1
NA		 517 if (entry->vid >= VLAN_VID_MASK)
518 return false;
cfd56754
CW		 519
520 return true;
521}
522
523static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
524 struct net_device **pdev, struct br_mdb_entry **pentry)
525{
526 struct net *net = sock_net(skb->sk);
527 struct br_mdb_entry *entry;
528 struct br_port_msg *bpm;
529 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
530 struct net_device *dev;
531 int err;
532
8cb08174
JB		 533 err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
534 MDBA_SET_ENTRY_MAX, NULL, NULL);
cfd56754
CW		 535 if (err < 0)
536 return err;
537
538 bpm = nlmsg_data(nlh);
539 if (bpm->ifindex == 0) {
540 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
541 return -EINVAL;
542 }
543
544 dev = __dev_get_by_index(net, bpm->ifindex);
545 if (dev == NULL) {
546 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
547 return -ENODEV;
548 }
549
550 if (!(dev->priv_flags & IFF_EBRIDGE)) {
551 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
552 return -EOPNOTSUPP;
553 }
554
555 *pdev = dev;
556
557 if (!tb[MDBA_SET_ENTRY] ||
558 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
559 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
560 return -EINVAL;
561 }
562
563 entry = nla_data(tb[MDBA_SET_ENTRY]);
564 if (!is_valid_mdb_entry(entry)) {
565 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
566 return -EINVAL;
567 }
568
569 *pentry = entry;
570 return 0;
571}
572
573static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
45ebcce5 574 struct br_ip *group, unsigned char state)
cfd56754
CW		 575{
576 struct net_bridge_mdb_entry *mp;
577 struct net_bridge_port_group *p;
578 struct net_bridge_port_group __rcu **pp;
f7e2965d 579 unsigned long now = jiffies;
cfd56754
CW		 580 int err;
581
19e3a9c9 582 mp = br_mdb_ip_get(br, group);
cfd56754 583 if (!mp) {
19e3a9c9 584 mp = br_multicast_new_group(br, group);
56bb7fd9
AB		 585 err = PTR_ERR_OR_ZERO(mp);
586 if (err)
cfd56754
CW		 587 return err;
588 }
589
590 for (pp = &mp->ports;
591 (p = mlock_dereference(*pp, br)) != NULL;
592 pp = &p->next) {
593 if (p->port == port)
594 return -EEXIST;
595 if ((unsigned long)p->port < (unsigned long)port)
596 break;
597 }
598
6db6f0ea 599 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
cfd56754
CW		 600 if (unlikely(!p))
601 return -ENOMEM;
602 rcu_assign_pointer(*pp, p);
f7e2965d
SA		 603 if (state == MDB_TEMPORARY)
604 mod_timer(&p->timer, now + br->multicast_membership_interval);
cfd56754 605
cfd56754
CW		 606 return 0;
607}
608
609static int __br_mdb_add(struct net *net, struct net_bridge *br,
45ebcce5 610 struct br_mdb_entry *entry)
cfd56754
CW		 611{
612 struct br_ip ip;
613 struct net_device *dev;
614 struct net_bridge_port *p;
615 int ret;
616
13cefad2 617 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
cfd56754
CW		 618 return -EINVAL;
619
620 dev = __dev_get_by_index(net, entry->ifindex);
621 if (!dev)
622 return -ENODEV;
623
624 p = br_port_get_rtnl(dev);
625 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
626 return -EINVAL;
627
6dd684c0 628 __mdb_entry_to_br_ip(entry, &ip);
cfd56754
CW		 629
630 spin_lock_bh(&br->multicast_lock);
45ebcce5 631 ret = br_mdb_add_group(br, p, &ip, entry->state);
cfd56754
CW		 632 spin_unlock_bh(&br->multicast_lock);
633 return ret;
634}
635
c21ef3e3
DA		 636static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
637 struct netlink_ext_ack *extack)
cfd56754
CW		 638{
639 struct net *net = sock_net(skb->sk);
2594e906 640 struct net_bridge_vlan_group *vg;
e44deb2f 641 struct net_device *dev, *pdev;
cfd56754 642 struct br_mdb_entry *entry;
e44deb2f 643 struct net_bridge_port *p;
2594e906 644 struct net_bridge_vlan *v;
cfd56754
CW		 645 struct net_bridge *br;
646 int err;
647
648 err = br_mdb_parse(skb, nlh, &dev, &entry);
649 if (err < 0)
650 return err;
651
652 br = netdev_priv(dev);
653
e44deb2f
SA		 654 /* If vlan filtering is enabled and VLAN is not specified
655 * install mdb entry on all vlans configured on the port.
656 */
657 pdev = __dev_get_by_index(net, entry->ifindex);
658 if (!pdev)
659 return -ENODEV;
660
661 p = br_port_get_rtnl(pdev);
662 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
663 return -EINVAL;
664
2594e906 665 vg = nbp_vlan_group(p);
1f51445a 666 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
2594e906
NA		 667 list_for_each_entry(v, &vg->vlan_list, vlist) {
668 entry->vid = v->vid;
45ebcce5 669 err = __br_mdb_add(net, br, entry);
e44deb2f
SA		 670 if (err)
671 break;
45ebcce5 672 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
e44deb2f
SA		 673 }
674 } else {
45ebcce5 675 err = __br_mdb_add(net, br, entry);
e44deb2f 676 if (!err)
45ebcce5 677 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
e44deb2f
SA		 678 }
679
cfd56754
CW		 680 return err;
681}
682
683static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
684{
cfd56754
CW		 685 struct net_bridge_mdb_entry *mp;
686 struct net_bridge_port_group *p;
687 struct net_bridge_port_group __rcu **pp;
688 struct br_ip ip;
689 int err = -EINVAL;
690
13cefad2 691 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
cfd56754
CW		 692 return -EINVAL;
693
6dd684c0 694 __mdb_entry_to_br_ip(entry, &ip);
cfd56754
CW		 695
696 spin_lock_bh(&br->multicast_lock);
19e3a9c9 697 mp = br_mdb_ip_get(br, &ip);
cfd56754
CW		 698 if (!mp)
699 goto unlock;
700
701 for (pp = &mp->ports;
702 (p = mlock_dereference(*pp, br)) != NULL;
703 pp = &p->next) {
704 if (!p->port || p->port->dev->ifindex != entry->ifindex)
705 continue;
706
707 if (p->port->state == BR_STATE_DISABLED)
708 goto unlock;
709
9d06b6d8 710 __mdb_entry_fill_flags(entry, p->flags);
cfd56754
CW		 711 rcu_assign_pointer(*pp, p->next);
712 hlist_del_init(&p->mglist);
713 del_timer(&p->timer);
4329596c 714 kfree_rcu(p, rcu);
cfd56754
CW		 715 err = 0;
716
ff0fd34e 717 if (!mp->ports && !mp->host_joined &&
cfd56754
CW		 718 netif_running(br->dev))
719 mod_timer(&mp->timer, jiffies);
720 break;
721 }
722
723unlock:
724 spin_unlock_bh(&br->multicast_lock);
725 return err;
726}
727
c21ef3e3
DA		 728static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
729 struct netlink_ext_ack *extack)
cfd56754 730{
e44deb2f 731 struct net *net = sock_net(skb->sk);
2594e906 732 struct net_bridge_vlan_group *vg;
e44deb2f 733 struct net_device *dev, *pdev;
cfd56754 734 struct br_mdb_entry *entry;
e44deb2f 735 struct net_bridge_port *p;
2594e906 736 struct net_bridge_vlan *v;
cfd56754
CW		 737 struct net_bridge *br;
738 int err;
739
740 err = br_mdb_parse(skb, nlh, &dev, &entry);
741 if (err < 0)
742 return err;
743
744 br = netdev_priv(dev);
745
e44deb2f
SA		 746 /* If vlan filtering is enabled and VLAN is not specified
747 * delete mdb entry on all vlans configured on the port.
748 */
749 pdev = __dev_get_by_index(net, entry->ifindex);
750 if (!pdev)
751 return -ENODEV;
752
753 p = br_port_get_rtnl(pdev);
754 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
755 return -EINVAL;
756
2594e906 757 vg = nbp_vlan_group(p);
1f51445a 758 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
2594e906
NA		 759 list_for_each_entry(v, &vg->vlan_list, vlist) {
760 entry->vid = v->vid;
e44deb2f
SA		 761 err = __br_mdb_del(br, entry);
762 if (!err)
45ebcce5 763 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
e44deb2f
SA		 764 }
765 } else {
766 err = __br_mdb_del(br, entry);
767 if (!err)
45ebcce5 768 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
e44deb2f
SA		 769 }
770
cfd56754
CW		 771 return err;
772}
773
ee07c6e7
CW		 774void br_mdb_init(void)
775{
c1c502b5
FW		 776 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
777 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
778 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
ee07c6e7 779}
63233159
VY		 780
781void br_mdb_uninit(void)
782{
783 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
784 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
785 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
786}
Linux 6.x block layer and io_uring tree(s)