Commit | Line | Data |
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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 | ||
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; | |
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; | |
52 | fail: | |
53 | nla_nest_cancel(skb, nest); | |
54 | return -EMSGSIZE; | |
55 | } | |
56 | ||
9d06b6d8 ER |
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; | |
3247b272 NA |
63 | if (flags & MDB_PG_FLAGS_FAST_LEAVE) |
64 | e->flags |= MDB_FLAGS_FAST_LEAVE; | |
9d06b6d8 ER |
65 | } |
66 | ||
6dd684c0 ER |
67 | static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip) |
68 | { | |
69 | memset(ip, 0, sizeof(struct br_ip)); | |
70 | ip->vid = entry->vid; | |
71 | ip->proto = entry->addr.proto; | |
72 | if (ip->proto == htons(ETH_P_IP)) | |
73 | ip->u.ip4 = entry->addr.u.ip4; | |
74 | #if IS_ENABLED(CONFIG_IPV6) | |
75 | else | |
76 | ip->u.ip6 = entry->addr.u.ip6; | |
77 | #endif | |
78 | } | |
79 | ||
6545916e | 80 | static int __mdb_fill_info(struct sk_buff *skb, |
e77b0c84 | 81 | struct net_bridge_mdb_entry *mp, |
6545916e NA |
82 | struct net_bridge_port_group *p) |
83 | { | |
e77b0c84 | 84 | struct timer_list *mtimer; |
6545916e NA |
85 | struct nlattr *nest_ent; |
86 | struct br_mdb_entry e; | |
e77b0c84 NA |
87 | u8 flags = 0; |
88 | int ifindex; | |
6545916e NA |
89 | |
90 | memset(&e, 0, sizeof(e)); | |
e77b0c84 NA |
91 | if (p) { |
92 | ifindex = p->port->dev->ifindex; | |
93 | mtimer = &p->timer; | |
94 | flags = p->flags; | |
95 | } else { | |
96 | ifindex = mp->br->dev->ifindex; | |
97 | mtimer = &mp->timer; | |
98 | } | |
99 | ||
100 | __mdb_entry_fill_flags(&e, flags); | |
101 | e.ifindex = ifindex; | |
102 | e.vid = mp->addr.vid; | |
103 | if (mp->addr.proto == htons(ETH_P_IP)) | |
104 | e.addr.u.ip4 = mp->addr.u.ip4; | |
6545916e | 105 | #if IS_ENABLED(CONFIG_IPV6) |
e77b0c84 NA |
106 | if (mp->addr.proto == htons(ETH_P_IPV6)) |
107 | e.addr.u.ip6 = mp->addr.u.ip6; | |
6545916e | 108 | #endif |
e77b0c84 | 109 | e.addr.proto = mp->addr.proto; |
6545916e NA |
110 | nest_ent = nla_nest_start_noflag(skb, |
111 | MDBA_MDB_ENTRY_INFO); | |
112 | if (!nest_ent) | |
113 | return -EMSGSIZE; | |
114 | ||
115 | if (nla_put_nohdr(skb, sizeof(e), &e) || | |
116 | nla_put_u32(skb, | |
117 | MDBA_MDB_EATTR_TIMER, | |
e77b0c84 | 118 | br_timer_value(mtimer))) { |
6545916e NA |
119 | nla_nest_cancel(skb, nest_ent); |
120 | return -EMSGSIZE; | |
121 | } | |
122 | nla_nest_end(skb, nest_ent); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
ee07c6e7 CW |
127 | static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb, |
128 | struct net_device *dev) | |
129 | { | |
19e3a9c9 | 130 | int idx = 0, s_idx = cb->args[1], err = 0; |
ee07c6e7 | 131 | struct net_bridge *br = netdev_priv(dev); |
19e3a9c9 | 132 | struct net_bridge_mdb_entry *mp; |
ee07c6e7 | 133 | struct nlattr *nest, *nest2; |
ee07c6e7 | 134 | |
13cefad2 | 135 | if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
ee07c6e7 CW |
136 | return 0; |
137 | ||
ae0be8de | 138 | nest = nla_nest_start_noflag(skb, MDBA_MDB); |
ee07c6e7 CW |
139 | if (nest == NULL) |
140 | return -EMSGSIZE; | |
141 | ||
19e3a9c9 | 142 | hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) { |
762a3d89 | 143 | struct net_bridge_port_group *p; |
144 | struct net_bridge_port_group __rcu **pp; | |
ee07c6e7 | 145 | |
19e3a9c9 NA |
146 | if (idx < s_idx) |
147 | goto skip; | |
ee07c6e7 | 148 | |
ae0be8de | 149 | nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY); |
19e3a9c9 NA |
150 | if (!nest2) { |
151 | err = -EMSGSIZE; | |
152 | break; | |
153 | } | |
ee07c6e7 | 154 | |
e77b0c84 NA |
155 | if (mp->host_joined) { |
156 | err = __mdb_fill_info(skb, mp, NULL); | |
157 | if (err) { | |
158 | nla_nest_cancel(skb, nest2); | |
159 | break; | |
160 | } | |
161 | } | |
162 | ||
19e3a9c9 NA |
163 | for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL; |
164 | pp = &p->next) { | |
6545916e | 165 | if (!p->port) |
19e3a9c9 NA |
166 | continue; |
167 | ||
e77b0c84 | 168 | err = __mdb_fill_info(skb, mp, p); |
6545916e | 169 | if (err) { |
19e3a9c9 | 170 | nla_nest_cancel(skb, nest2); |
19e3a9c9 NA |
171 | goto out; |
172 | } | |
ee07c6e7 | 173 | } |
19e3a9c9 NA |
174 | nla_nest_end(skb, nest2); |
175 | skip: | |
176 | idx++; | |
ee07c6e7 CW |
177 | } |
178 | ||
179 | out: | |
180 | cb->args[1] = idx; | |
181 | nla_nest_end(skb, nest); | |
182 | return err; | |
183 | } | |
184 | ||
c77b9364 DA |
185 | static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh, |
186 | struct netlink_ext_ack *extack) | |
187 | { | |
188 | struct br_port_msg *bpm; | |
189 | ||
190 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) { | |
191 | NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request"); | |
192 | return -EINVAL; | |
193 | } | |
194 | ||
195 | bpm = nlmsg_data(nlh); | |
196 | if (bpm->ifindex) { | |
197 | NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request"); | |
198 | return -EINVAL; | |
199 | } | |
200 | if (nlmsg_attrlen(nlh, sizeof(*bpm))) { | |
201 | NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request"); | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
ee07c6e7 CW |
208 | static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb) |
209 | { | |
210 | struct net_device *dev; | |
211 | struct net *net = sock_net(skb->sk); | |
212 | struct nlmsghdr *nlh = NULL; | |
213 | int idx = 0, s_idx; | |
214 | ||
c77b9364 DA |
215 | if (cb->strict_check) { |
216 | int err = br_mdb_valid_dump_req(cb->nlh, cb->extack); | |
217 | ||
218 | if (err < 0) | |
219 | return err; | |
220 | } | |
221 | ||
ee07c6e7 CW |
222 | s_idx = cb->args[0]; |
223 | ||
224 | rcu_read_lock(); | |
225 | ||
19e3a9c9 | 226 | cb->seq = net->dev_base_seq; |
ee07c6e7 CW |
227 | |
228 | for_each_netdev_rcu(net, dev) { | |
229 | if (dev->priv_flags & IFF_EBRIDGE) { | |
230 | struct br_port_msg *bpm; | |
231 | ||
232 | if (idx < s_idx) | |
233 | goto skip; | |
234 | ||
235 | nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, | |
236 | cb->nlh->nlmsg_seq, RTM_GETMDB, | |
237 | sizeof(*bpm), NLM_F_MULTI); | |
238 | if (nlh == NULL) | |
239 | break; | |
240 | ||
241 | bpm = nlmsg_data(nlh); | |
c085c499 | 242 | memset(bpm, 0, sizeof(*bpm)); |
ee07c6e7 CW |
243 | bpm->ifindex = dev->ifindex; |
244 | if (br_mdb_fill_info(skb, cb, dev) < 0) | |
245 | goto out; | |
246 | if (br_rports_fill_info(skb, cb, dev) < 0) | |
247 | goto out; | |
248 | ||
249 | cb->args[1] = 0; | |
250 | nlmsg_end(skb, nlh); | |
251 | skip: | |
252 | idx++; | |
253 | } | |
254 | } | |
255 | ||
256 | out: | |
257 | if (nlh) | |
258 | nlmsg_end(skb, nlh); | |
259 | rcu_read_unlock(); | |
260 | cb->args[0] = idx; | |
261 | return skb->len; | |
262 | } | |
263 | ||
37a393bc CW |
264 | static int nlmsg_populate_mdb_fill(struct sk_buff *skb, |
265 | struct net_device *dev, | |
266 | struct br_mdb_entry *entry, u32 pid, | |
267 | u32 seq, int type, unsigned int flags) | |
268 | { | |
269 | struct nlmsghdr *nlh; | |
270 | struct br_port_msg *bpm; | |
271 | struct nlattr *nest, *nest2; | |
272 | ||
82199679 | 273 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0); |
37a393bc CW |
274 | if (!nlh) |
275 | return -EMSGSIZE; | |
276 | ||
277 | bpm = nlmsg_data(nlh); | |
c085c499 | 278 | memset(bpm, 0, sizeof(*bpm)); |
37a393bc CW |
279 | bpm->family = AF_BRIDGE; |
280 | bpm->ifindex = dev->ifindex; | |
ae0be8de | 281 | nest = nla_nest_start_noflag(skb, MDBA_MDB); |
37a393bc CW |
282 | if (nest == NULL) |
283 | goto cancel; | |
ae0be8de | 284 | nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY); |
37a393bc CW |
285 | if (nest2 == NULL) |
286 | goto end; | |
287 | ||
288 | if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry)) | |
289 | goto end; | |
290 | ||
291 | nla_nest_end(skb, nest2); | |
292 | nla_nest_end(skb, nest); | |
053c095a JB |
293 | nlmsg_end(skb, nlh); |
294 | return 0; | |
37a393bc CW |
295 | |
296 | end: | |
297 | nla_nest_end(skb, nest); | |
298 | cancel: | |
299 | nlmsg_cancel(skb, nlh); | |
300 | return -EMSGSIZE; | |
301 | } | |
302 | ||
303 | static inline size_t rtnl_mdb_nlmsg_size(void) | |
304 | { | |
305 | return NLMSG_ALIGN(sizeof(struct br_port_msg)) | |
306 | + nla_total_size(sizeof(struct br_mdb_entry)); | |
307 | } | |
308 | ||
45ebcce5 ER |
309 | struct br_mdb_complete_info { |
310 | struct net_bridge_port *port; | |
311 | struct br_ip ip; | |
312 | }; | |
313 | ||
314 | static void br_mdb_complete(struct net_device *dev, int err, void *priv) | |
37a393bc | 315 | { |
45ebcce5 ER |
316 | struct br_mdb_complete_info *data = priv; |
317 | struct net_bridge_port_group __rcu **pp; | |
318 | struct net_bridge_port_group *p; | |
45ebcce5 ER |
319 | struct net_bridge_mdb_entry *mp; |
320 | struct net_bridge_port *port = data->port; | |
321 | struct net_bridge *br = port->br; | |
322 | ||
323 | if (err) | |
324 | goto err; | |
325 | ||
326 | spin_lock_bh(&br->multicast_lock); | |
19e3a9c9 | 327 | mp = br_mdb_ip_get(br, &data->ip); |
45ebcce5 ER |
328 | if (!mp) |
329 | goto out; | |
330 | for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL; | |
331 | pp = &p->next) { | |
332 | if (p->port != port) | |
333 | continue; | |
334 | p->flags |= MDB_PG_FLAGS_OFFLOAD; | |
335 | } | |
336 | out: | |
337 | spin_unlock_bh(&br->multicast_lock); | |
338 | err: | |
339 | kfree(priv); | |
340 | } | |
341 | ||
47d5b6db AL |
342 | static void br_mdb_switchdev_host_port(struct net_device *dev, |
343 | struct net_device *lower_dev, | |
344 | struct br_mdb_entry *entry, int type) | |
345 | { | |
346 | struct switchdev_obj_port_mdb mdb = { | |
347 | .obj = { | |
348 | .id = SWITCHDEV_OBJ_ID_HOST_MDB, | |
349 | .flags = SWITCHDEV_F_DEFER, | |
350 | }, | |
351 | .vid = entry->vid, | |
352 | }; | |
353 | ||
354 | if (entry->addr.proto == htons(ETH_P_IP)) | |
355 | ip_eth_mc_map(entry->addr.u.ip4, mdb.addr); | |
356 | #if IS_ENABLED(CONFIG_IPV6) | |
357 | else | |
358 | ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr); | |
359 | #endif | |
360 | ||
361 | mdb.obj.orig_dev = dev; | |
362 | switch (type) { | |
363 | case RTM_NEWMDB: | |
69b7320e | 364 | switchdev_port_obj_add(lower_dev, &mdb.obj, NULL); |
47d5b6db AL |
365 | break; |
366 | case RTM_DELMDB: | |
367 | switchdev_port_obj_del(lower_dev, &mdb.obj); | |
368 | break; | |
369 | } | |
370 | } | |
371 | ||
372 | static void br_mdb_switchdev_host(struct net_device *dev, | |
373 | struct br_mdb_entry *entry, int type) | |
374 | { | |
375 | struct net_device *lower_dev; | |
376 | struct list_head *iter; | |
377 | ||
378 | netdev_for_each_lower_dev(dev, lower_dev, iter) | |
379 | br_mdb_switchdev_host_port(dev, lower_dev, entry, type); | |
380 | } | |
381 | ||
45ebcce5 ER |
382 | static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p, |
383 | struct br_mdb_entry *entry, int type) | |
384 | { | |
385 | struct br_mdb_complete_info *complete_info; | |
f1fecb1d ER |
386 | struct switchdev_obj_port_mdb mdb = { |
387 | .obj = { | |
388 | .id = SWITCHDEV_OBJ_ID_PORT_MDB, | |
389 | .flags = SWITCHDEV_F_DEFER, | |
390 | }, | |
391 | .vid = entry->vid, | |
392 | }; | |
393 | struct net_device *port_dev; | |
37a393bc CW |
394 | struct net *net = dev_net(dev); |
395 | struct sk_buff *skb; | |
396 | int err = -ENOBUFS; | |
397 | ||
f1fecb1d ER |
398 | port_dev = __dev_get_by_index(net, entry->ifindex); |
399 | if (entry->addr.proto == htons(ETH_P_IP)) | |
400 | ip_eth_mc_map(entry->addr.u.ip4, mdb.addr); | |
401 | #if IS_ENABLED(CONFIG_IPV6) | |
402 | else | |
403 | ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr); | |
404 | #endif | |
405 | ||
406 | mdb.obj.orig_dev = port_dev; | |
2a26028d | 407 | if (p && port_dev && type == RTM_NEWMDB) { |
45ebcce5 ER |
408 | complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC); |
409 | if (complete_info) { | |
410 | complete_info->port = p; | |
411 | __mdb_entry_to_br_ip(entry, &complete_info->ip); | |
412 | mdb.obj.complete_priv = complete_info; | |
413 | mdb.obj.complete = br_mdb_complete; | |
69b7320e | 414 | if (switchdev_port_obj_add(port_dev, &mdb.obj, NULL)) |
1bfb1596 | 415 | kfree(complete_info); |
45ebcce5 | 416 | } |
2a26028d | 417 | } else if (p && port_dev && type == RTM_DELMDB) { |
f1fecb1d | 418 | switchdev_port_obj_del(port_dev, &mdb.obj); |
9e8430f8 | 419 | } |
f1fecb1d | 420 | |
47d5b6db AL |
421 | if (!p) |
422 | br_mdb_switchdev_host(dev, entry, type); | |
423 | ||
37a393bc CW |
424 | skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC); |
425 | if (!skb) | |
426 | goto errout; | |
427 | ||
428 | err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF); | |
429 | if (err < 0) { | |
430 | kfree_skb(skb); | |
431 | goto errout; | |
432 | } | |
433 | ||
434 | rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); | |
435 | return; | |
436 | errout: | |
437 | rtnl_set_sk_err(net, RTNLGRP_MDB, err); | |
438 | } | |
439 | ||
45ebcce5 ER |
440 | void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, |
441 | struct br_ip *group, int type, u8 flags) | |
37a393bc CW |
442 | { |
443 | struct br_mdb_entry entry; | |
444 | ||
c085c499 | 445 | memset(&entry, 0, sizeof(entry)); |
2a26028d AL |
446 | if (port) |
447 | entry.ifindex = port->dev->ifindex; | |
448 | else | |
449 | entry.ifindex = dev->ifindex; | |
45ebcce5 ER |
450 | entry.addr.proto = group->proto; |
451 | entry.addr.u.ip4 = group->u.ip4; | |
37a393bc | 452 | #if IS_ENABLED(CONFIG_IPV6) |
45ebcce5 | 453 | entry.addr.u.ip6 = group->u.ip6; |
37a393bc | 454 | #endif |
45ebcce5 ER |
455 | entry.vid = group->vid; |
456 | __mdb_entry_fill_flags(&entry, flags); | |
457 | __br_mdb_notify(dev, port, &entry, type); | |
37a393bc CW |
458 | } |
459 | ||
949f1e39 SA |
460 | static int nlmsg_populate_rtr_fill(struct sk_buff *skb, |
461 | struct net_device *dev, | |
462 | int ifindex, u32 pid, | |
463 | u32 seq, int type, unsigned int flags) | |
464 | { | |
465 | struct br_port_msg *bpm; | |
466 | struct nlmsghdr *nlh; | |
467 | struct nlattr *nest; | |
468 | ||
94a72b3f | 469 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0); |
949f1e39 SA |
470 | if (!nlh) |
471 | return -EMSGSIZE; | |
472 | ||
473 | bpm = nlmsg_data(nlh); | |
474 | memset(bpm, 0, sizeof(*bpm)); | |
475 | bpm->family = AF_BRIDGE; | |
476 | bpm->ifindex = dev->ifindex; | |
ae0be8de | 477 | nest = nla_nest_start_noflag(skb, MDBA_ROUTER); |
949f1e39 SA |
478 | if (!nest) |
479 | goto cancel; | |
480 | ||
481 | if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex)) | |
482 | goto end; | |
483 | ||
484 | nla_nest_end(skb, nest); | |
485 | nlmsg_end(skb, nlh); | |
486 | return 0; | |
487 | ||
488 | end: | |
489 | nla_nest_end(skb, nest); | |
490 | cancel: | |
491 | nlmsg_cancel(skb, nlh); | |
492 | return -EMSGSIZE; | |
493 | } | |
494 | ||
495 | static inline size_t rtnl_rtr_nlmsg_size(void) | |
496 | { | |
497 | return NLMSG_ALIGN(sizeof(struct br_port_msg)) | |
498 | + nla_total_size(sizeof(__u32)); | |
499 | } | |
500 | ||
501 | void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, | |
502 | int type) | |
503 | { | |
504 | struct net *net = dev_net(dev); | |
505 | struct sk_buff *skb; | |
506 | int err = -ENOBUFS; | |
507 | int ifindex; | |
508 | ||
509 | ifindex = port ? port->dev->ifindex : 0; | |
510 | skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC); | |
511 | if (!skb) | |
512 | goto errout; | |
513 | ||
514 | err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF); | |
515 | if (err < 0) { | |
516 | kfree_skb(skb); | |
517 | goto errout; | |
518 | } | |
519 | ||
520 | rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC); | |
521 | return; | |
522 | ||
523 | errout: | |
524 | rtnl_set_sk_err(net, RTNLGRP_MDB, err); | |
525 | } | |
526 | ||
cfd56754 CW |
527 | static bool is_valid_mdb_entry(struct br_mdb_entry *entry) |
528 | { | |
529 | if (entry->ifindex == 0) | |
530 | return false; | |
531 | ||
532 | if (entry->addr.proto == htons(ETH_P_IP)) { | |
533 | if (!ipv4_is_multicast(entry->addr.u.ip4)) | |
534 | return false; | |
535 | if (ipv4_is_local_multicast(entry->addr.u.ip4)) | |
536 | return false; | |
537 | #if IS_ENABLED(CONFIG_IPV6) | |
538 | } else if (entry->addr.proto == htons(ETH_P_IPV6)) { | |
3c3769e6 | 539 | if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) |
cfd56754 CW |
540 | return false; |
541 | #endif | |
542 | } else | |
543 | return false; | |
ccb1c31a AW |
544 | if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) |
545 | return false; | |
74fe61f1 NA |
546 | if (entry->vid >= VLAN_VID_MASK) |
547 | return false; | |
cfd56754 CW |
548 | |
549 | return true; | |
550 | } | |
551 | ||
552 | static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, | |
553 | struct net_device **pdev, struct br_mdb_entry **pentry) | |
554 | { | |
555 | struct net *net = sock_net(skb->sk); | |
556 | struct br_mdb_entry *entry; | |
557 | struct br_port_msg *bpm; | |
558 | struct nlattr *tb[MDBA_SET_ENTRY_MAX+1]; | |
559 | struct net_device *dev; | |
560 | int err; | |
561 | ||
8cb08174 JB |
562 | err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb, |
563 | MDBA_SET_ENTRY_MAX, NULL, NULL); | |
cfd56754 CW |
564 | if (err < 0) |
565 | return err; | |
566 | ||
567 | bpm = nlmsg_data(nlh); | |
568 | if (bpm->ifindex == 0) { | |
569 | pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n"); | |
570 | return -EINVAL; | |
571 | } | |
572 | ||
573 | dev = __dev_get_by_index(net, bpm->ifindex); | |
574 | if (dev == NULL) { | |
575 | pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n"); | |
576 | return -ENODEV; | |
577 | } | |
578 | ||
579 | if (!(dev->priv_flags & IFF_EBRIDGE)) { | |
580 | pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n"); | |
581 | return -EOPNOTSUPP; | |
582 | } | |
583 | ||
584 | *pdev = dev; | |
585 | ||
586 | if (!tb[MDBA_SET_ENTRY] || | |
587 | nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { | |
588 | pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n"); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | entry = nla_data(tb[MDBA_SET_ENTRY]); | |
593 | if (!is_valid_mdb_entry(entry)) { | |
594 | pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n"); | |
595 | return -EINVAL; | |
596 | } | |
597 | ||
598 | *pentry = entry; | |
599 | return 0; | |
600 | } | |
601 | ||
602 | static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port, | |
45ebcce5 | 603 | struct br_ip *group, unsigned char state) |
cfd56754 CW |
604 | { |
605 | struct net_bridge_mdb_entry *mp; | |
606 | struct net_bridge_port_group *p; | |
607 | struct net_bridge_port_group __rcu **pp; | |
f7e2965d | 608 | unsigned long now = jiffies; |
cfd56754 CW |
609 | int err; |
610 | ||
19e3a9c9 | 611 | mp = br_mdb_ip_get(br, group); |
cfd56754 | 612 | if (!mp) { |
19e3a9c9 | 613 | mp = br_multicast_new_group(br, group); |
56bb7fd9 AB |
614 | err = PTR_ERR_OR_ZERO(mp); |
615 | if (err) | |
cfd56754 CW |
616 | return err; |
617 | } | |
618 | ||
1bc844ee NA |
619 | /* host join */ |
620 | if (!port) { | |
621 | /* don't allow any flags for host-joined groups */ | |
622 | if (state) | |
623 | return -EINVAL; | |
624 | if (mp->host_joined) | |
625 | return -EEXIST; | |
626 | ||
627 | br_multicast_host_join(mp, false); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
cfd56754 CW |
632 | for (pp = &mp->ports; |
633 | (p = mlock_dereference(*pp, br)) != NULL; | |
634 | pp = &p->next) { | |
635 | if (p->port == port) | |
636 | return -EEXIST; | |
637 | if ((unsigned long)p->port < (unsigned long)port) | |
638 | break; | |
639 | } | |
640 | ||
6db6f0ea | 641 | p = br_multicast_new_port_group(port, group, *pp, state, NULL); |
cfd56754 CW |
642 | if (unlikely(!p)) |
643 | return -ENOMEM; | |
644 | rcu_assign_pointer(*pp, p); | |
f7e2965d SA |
645 | if (state == MDB_TEMPORARY) |
646 | mod_timer(&p->timer, now + br->multicast_membership_interval); | |
cfd56754 | 647 | |
cfd56754 CW |
648 | return 0; |
649 | } | |
650 | ||
651 | static int __br_mdb_add(struct net *net, struct net_bridge *br, | |
45ebcce5 | 652 | struct br_mdb_entry *entry) |
cfd56754 CW |
653 | { |
654 | struct br_ip ip; | |
655 | struct net_device *dev; | |
1bc844ee | 656 | struct net_bridge_port *p = NULL; |
cfd56754 CW |
657 | int ret; |
658 | ||
13cefad2 | 659 | if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
cfd56754 CW |
660 | return -EINVAL; |
661 | ||
1bc844ee NA |
662 | if (entry->ifindex != br->dev->ifindex) { |
663 | dev = __dev_get_by_index(net, entry->ifindex); | |
664 | if (!dev) | |
665 | return -ENODEV; | |
cfd56754 | 666 | |
1bc844ee NA |
667 | p = br_port_get_rtnl(dev); |
668 | if (!p || p->br != br || p->state == BR_STATE_DISABLED) | |
669 | return -EINVAL; | |
670 | } | |
cfd56754 | 671 | |
6dd684c0 | 672 | __mdb_entry_to_br_ip(entry, &ip); |
cfd56754 CW |
673 | |
674 | spin_lock_bh(&br->multicast_lock); | |
45ebcce5 | 675 | ret = br_mdb_add_group(br, p, &ip, entry->state); |
cfd56754 CW |
676 | spin_unlock_bh(&br->multicast_lock); |
677 | return ret; | |
678 | } | |
679 | ||
c21ef3e3 DA |
680 | static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, |
681 | struct netlink_ext_ack *extack) | |
cfd56754 CW |
682 | { |
683 | struct net *net = sock_net(skb->sk); | |
2594e906 | 684 | struct net_bridge_vlan_group *vg; |
1bc844ee | 685 | struct net_bridge_port *p = NULL; |
e44deb2f | 686 | struct net_device *dev, *pdev; |
cfd56754 | 687 | struct br_mdb_entry *entry; |
2594e906 | 688 | struct net_bridge_vlan *v; |
cfd56754 CW |
689 | struct net_bridge *br; |
690 | int err; | |
691 | ||
692 | err = br_mdb_parse(skb, nlh, &dev, &entry); | |
693 | if (err < 0) | |
694 | return err; | |
695 | ||
696 | br = netdev_priv(dev); | |
697 | ||
1bc844ee NA |
698 | if (entry->ifindex != br->dev->ifindex) { |
699 | pdev = __dev_get_by_index(net, entry->ifindex); | |
700 | if (!pdev) | |
701 | return -ENODEV; | |
e44deb2f | 702 | |
1bc844ee NA |
703 | p = br_port_get_rtnl(pdev); |
704 | if (!p || p->br != br || p->state == BR_STATE_DISABLED) | |
705 | return -EINVAL; | |
706 | vg = nbp_vlan_group(p); | |
707 | } else { | |
708 | vg = br_vlan_group(br); | |
709 | } | |
e44deb2f | 710 | |
f59783f5 NA |
711 | /* If vlan filtering is enabled and VLAN is not specified |
712 | * install mdb entry on all vlans configured on the port. | |
713 | */ | |
1f51445a | 714 | if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { |
2594e906 NA |
715 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
716 | entry->vid = v->vid; | |
45ebcce5 | 717 | err = __br_mdb_add(net, br, entry); |
e44deb2f SA |
718 | if (err) |
719 | break; | |
45ebcce5 | 720 | __br_mdb_notify(dev, p, entry, RTM_NEWMDB); |
e44deb2f SA |
721 | } |
722 | } else { | |
45ebcce5 | 723 | err = __br_mdb_add(net, br, entry); |
e44deb2f | 724 | if (!err) |
45ebcce5 | 725 | __br_mdb_notify(dev, p, entry, RTM_NEWMDB); |
e44deb2f SA |
726 | } |
727 | ||
cfd56754 CW |
728 | return err; |
729 | } | |
730 | ||
731 | static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry) | |
732 | { | |
cfd56754 CW |
733 | struct net_bridge_mdb_entry *mp; |
734 | struct net_bridge_port_group *p; | |
735 | struct net_bridge_port_group __rcu **pp; | |
736 | struct br_ip ip; | |
737 | int err = -EINVAL; | |
738 | ||
13cefad2 | 739 | if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED)) |
cfd56754 CW |
740 | return -EINVAL; |
741 | ||
6dd684c0 | 742 | __mdb_entry_to_br_ip(entry, &ip); |
cfd56754 CW |
743 | |
744 | spin_lock_bh(&br->multicast_lock); | |
19e3a9c9 | 745 | mp = br_mdb_ip_get(br, &ip); |
cfd56754 CW |
746 | if (!mp) |
747 | goto unlock; | |
748 | ||
1bc844ee NA |
749 | /* host leave */ |
750 | if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) { | |
751 | br_multicast_host_leave(mp, false); | |
752 | err = 0; | |
753 | if (!mp->ports && netif_running(br->dev)) | |
754 | mod_timer(&mp->timer, jiffies); | |
755 | goto unlock; | |
756 | } | |
757 | ||
cfd56754 CW |
758 | for (pp = &mp->ports; |
759 | (p = mlock_dereference(*pp, br)) != NULL; | |
760 | pp = &p->next) { | |
761 | if (!p->port || p->port->dev->ifindex != entry->ifindex) | |
762 | continue; | |
763 | ||
764 | if (p->port->state == BR_STATE_DISABLED) | |
765 | goto unlock; | |
766 | ||
9d06b6d8 | 767 | __mdb_entry_fill_flags(entry, p->flags); |
cfd56754 CW |
768 | rcu_assign_pointer(*pp, p->next); |
769 | hlist_del_init(&p->mglist); | |
770 | del_timer(&p->timer); | |
4329596c | 771 | kfree_rcu(p, rcu); |
cfd56754 CW |
772 | err = 0; |
773 | ||
ff0fd34e | 774 | if (!mp->ports && !mp->host_joined && |
cfd56754 CW |
775 | netif_running(br->dev)) |
776 | mod_timer(&mp->timer, jiffies); | |
777 | break; | |
778 | } | |
779 | ||
780 | unlock: | |
781 | spin_unlock_bh(&br->multicast_lock); | |
782 | return err; | |
783 | } | |
784 | ||
c21ef3e3 DA |
785 | static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, |
786 | struct netlink_ext_ack *extack) | |
cfd56754 | 787 | { |
e44deb2f | 788 | struct net *net = sock_net(skb->sk); |
2594e906 | 789 | struct net_bridge_vlan_group *vg; |
1bc844ee | 790 | struct net_bridge_port *p = NULL; |
e44deb2f | 791 | struct net_device *dev, *pdev; |
cfd56754 | 792 | struct br_mdb_entry *entry; |
2594e906 | 793 | struct net_bridge_vlan *v; |
cfd56754 CW |
794 | struct net_bridge *br; |
795 | int err; | |
796 | ||
797 | err = br_mdb_parse(skb, nlh, &dev, &entry); | |
798 | if (err < 0) | |
799 | return err; | |
800 | ||
801 | br = netdev_priv(dev); | |
802 | ||
1bc844ee NA |
803 | if (entry->ifindex != br->dev->ifindex) { |
804 | pdev = __dev_get_by_index(net, entry->ifindex); | |
805 | if (!pdev) | |
806 | return -ENODEV; | |
e44deb2f | 807 | |
1bc844ee NA |
808 | p = br_port_get_rtnl(pdev); |
809 | if (!p || p->br != br || p->state == BR_STATE_DISABLED) | |
810 | return -EINVAL; | |
811 | vg = nbp_vlan_group(p); | |
812 | } else { | |
813 | vg = br_vlan_group(br); | |
814 | } | |
e44deb2f | 815 | |
f59783f5 NA |
816 | /* If vlan filtering is enabled and VLAN is not specified |
817 | * delete mdb entry on all vlans configured on the port. | |
818 | */ | |
1f51445a | 819 | if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) { |
2594e906 NA |
820 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
821 | entry->vid = v->vid; | |
e44deb2f SA |
822 | err = __br_mdb_del(br, entry); |
823 | if (!err) | |
45ebcce5 | 824 | __br_mdb_notify(dev, p, entry, RTM_DELMDB); |
e44deb2f SA |
825 | } |
826 | } else { | |
827 | err = __br_mdb_del(br, entry); | |
828 | if (!err) | |
45ebcce5 | 829 | __br_mdb_notify(dev, p, entry, RTM_DELMDB); |
e44deb2f SA |
830 | } |
831 | ||
cfd56754 CW |
832 | return err; |
833 | } | |
834 | ||
ee07c6e7 CW |
835 | void br_mdb_init(void) |
836 | { | |
c1c502b5 FW |
837 | rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0); |
838 | rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0); | |
839 | rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0); | |
ee07c6e7 | 840 | } |
63233159 VY |
841 | |
842 | void br_mdb_uninit(void) | |
843 | { | |
844 | rtnl_unregister(PF_BRIDGE, RTM_GETMDB); | |
845 | rtnl_unregister(PF_BRIDGE, RTM_NEWMDB); | |
846 | rtnl_unregister(PF_BRIDGE, RTM_DELMDB); | |
847 | } |