2 #include <linux/igmp.h>
3 #include <linux/kernel.h>
4 #include <linux/netdevice.h>
5 #include <linux/rculist.h>
6 #include <linux/skbuff.h>
7 #include <linux/if_ether.h>
9 #include <net/netlink.h>
10 #if IS_ENABLED(CONFIG_IPV6)
14 #include "br_private.h"
16 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
17 struct net_device *dev)
19 struct net_bridge *br = netdev_priv(dev);
20 struct net_bridge_port *p;
24 if (!br->multicast_router || hlist_empty(&br->router_list))
27 nest = nla_nest_start(skb, MDBA_ROUTER);
31 hlist_for_each_entry_rcu(p, n, &br->router_list, rlist) {
32 if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
36 nla_nest_end(skb, nest);
39 nla_nest_cancel(skb, nest);
43 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
44 struct net_device *dev)
46 struct net_bridge *br = netdev_priv(dev);
47 struct net_bridge_mdb_htable *mdb;
48 struct nlattr *nest, *nest2;
50 int idx = 0, s_idx = cb->args[1];
52 if (br->multicast_disabled)
55 mdb = rcu_dereference(br->mdb);
59 nest = nla_nest_start(skb, MDBA_MDB);
63 for (i = 0; i < mdb->max; i++) {
65 struct net_bridge_mdb_entry *mp;
66 struct net_bridge_port_group *p, **pp;
67 struct net_bridge_port *port;
69 hlist_for_each_entry_rcu(mp, h, &mdb->mhash[i], hlist[mdb->ver]) {
73 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
80 (p = rcu_dereference(*pp)) != NULL;
84 struct br_mdb_entry e;
85 e.ifindex = port->dev->ifindex;
87 e.addr.u.ip4 = p->addr.u.ip4;
88 #if IS_ENABLED(CONFIG_IPV6)
89 e.addr.u.ip6 = p->addr.u.ip6;
91 e.addr.proto = p->addr.proto;
92 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
93 nla_nest_cancel(skb, nest2);
99 nla_nest_end(skb, nest2);
107 nla_nest_end(skb, nest);
111 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
113 struct net_device *dev;
114 struct net *net = sock_net(skb->sk);
115 struct nlmsghdr *nlh = NULL;
122 /* In theory this could be wrapped to 0... */
123 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
125 for_each_netdev_rcu(net, dev) {
126 if (dev->priv_flags & IFF_EBRIDGE) {
127 struct br_port_msg *bpm;
132 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
133 cb->nlh->nlmsg_seq, RTM_GETMDB,
134 sizeof(*bpm), NLM_F_MULTI);
138 bpm = nlmsg_data(nlh);
139 bpm->ifindex = dev->ifindex;
140 if (br_mdb_fill_info(skb, cb, dev) < 0)
142 if (br_rports_fill_info(skb, cb, dev) < 0)
160 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
161 struct net_device *dev,
162 struct br_mdb_entry *entry, u32 pid,
163 u32 seq, int type, unsigned int flags)
165 struct nlmsghdr *nlh;
166 struct br_port_msg *bpm;
167 struct nlattr *nest, *nest2;
169 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
173 bpm = nlmsg_data(nlh);
174 bpm->family = AF_BRIDGE;
175 bpm->ifindex = dev->ifindex;
176 nest = nla_nest_start(skb, MDBA_MDB);
179 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
183 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
186 nla_nest_end(skb, nest2);
187 nla_nest_end(skb, nest);
188 return nlmsg_end(skb, nlh);
191 nla_nest_end(skb, nest);
193 nlmsg_cancel(skb, nlh);
197 static inline size_t rtnl_mdb_nlmsg_size(void)
199 return NLMSG_ALIGN(sizeof(struct br_port_msg))
200 + nla_total_size(sizeof(struct br_mdb_entry));
203 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
206 struct net *net = dev_net(dev);
210 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
214 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
220 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
223 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
226 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
227 struct br_ip *group, int type)
229 struct br_mdb_entry entry;
231 entry.ifindex = port->dev->ifindex;
232 entry.addr.proto = group->proto;
233 entry.addr.u.ip4 = group->u.ip4;
234 #if IS_ENABLED(CONFIG_IPV6)
235 entry.addr.u.ip6 = group->u.ip6;
237 __br_mdb_notify(dev, &entry, type);
240 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
242 if (entry->ifindex == 0)
245 if (entry->addr.proto == htons(ETH_P_IP)) {
246 if (!ipv4_is_multicast(entry->addr.u.ip4))
248 if (ipv4_is_local_multicast(entry->addr.u.ip4))
250 #if IS_ENABLED(CONFIG_IPV6)
251 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
252 if (!ipv6_is_transient_multicast(&entry->addr.u.ip6))
257 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
263 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
264 struct net_device **pdev, struct br_mdb_entry **pentry)
266 struct net *net = sock_net(skb->sk);
267 struct br_mdb_entry *entry;
268 struct br_port_msg *bpm;
269 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
270 struct net_device *dev;
273 if (!capable(CAP_NET_ADMIN))
276 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY, NULL);
280 bpm = nlmsg_data(nlh);
281 if (bpm->ifindex == 0) {
282 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
286 dev = __dev_get_by_index(net, bpm->ifindex);
288 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
292 if (!(dev->priv_flags & IFF_EBRIDGE)) {
293 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
299 if (!tb[MDBA_SET_ENTRY] ||
300 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
301 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
305 entry = nla_data(tb[MDBA_SET_ENTRY]);
306 if (!is_valid_mdb_entry(entry)) {
307 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
315 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
316 struct br_ip *group, unsigned char state)
318 struct net_bridge_mdb_entry *mp;
319 struct net_bridge_port_group *p;
320 struct net_bridge_port_group __rcu **pp;
321 struct net_bridge_mdb_htable *mdb;
324 mdb = mlock_dereference(br->mdb, br);
325 mp = br_mdb_ip_get(mdb, group);
327 mp = br_multicast_new_group(br, port, group);
333 for (pp = &mp->ports;
334 (p = mlock_dereference(*pp, br)) != NULL;
338 if ((unsigned long)p->port < (unsigned long)port)
342 p = br_multicast_new_port_group(port, group, *pp, state);
345 rcu_assign_pointer(*pp, p);
347 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
351 static int __br_mdb_add(struct net *net, struct net_bridge *br,
352 struct br_mdb_entry *entry)
355 struct net_device *dev;
356 struct net_bridge_port *p;
359 if (!netif_running(br->dev) || br->multicast_disabled)
362 dev = __dev_get_by_index(net, entry->ifindex);
366 p = br_port_get_rtnl(dev);
367 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
370 ip.proto = entry->addr.proto;
371 if (ip.proto == htons(ETH_P_IP))
372 ip.u.ip4 = entry->addr.u.ip4;
373 #if IS_ENABLED(CONFIG_IPV6)
375 ip.u.ip6 = entry->addr.u.ip6;
378 spin_lock_bh(&br->multicast_lock);
379 ret = br_mdb_add_group(br, p, &ip, entry->state);
380 spin_unlock_bh(&br->multicast_lock);
384 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
386 struct net *net = sock_net(skb->sk);
387 struct br_mdb_entry *entry;
388 struct net_device *dev;
389 struct net_bridge *br;
392 err = br_mdb_parse(skb, nlh, &dev, &entry);
396 br = netdev_priv(dev);
398 err = __br_mdb_add(net, br, entry);
400 __br_mdb_notify(dev, entry, RTM_NEWMDB);
404 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
406 struct net_bridge_mdb_htable *mdb;
407 struct net_bridge_mdb_entry *mp;
408 struct net_bridge_port_group *p;
409 struct net_bridge_port_group __rcu **pp;
413 if (!netif_running(br->dev) || br->multicast_disabled)
416 if (timer_pending(&br->multicast_querier_timer))
419 ip.proto = entry->addr.proto;
420 if (ip.proto == htons(ETH_P_IP))
421 ip.u.ip4 = entry->addr.u.ip4;
422 #if IS_ENABLED(CONFIG_IPV6)
424 ip.u.ip6 = entry->addr.u.ip6;
427 spin_lock_bh(&br->multicast_lock);
428 mdb = mlock_dereference(br->mdb, br);
430 mp = br_mdb_ip_get(mdb, &ip);
434 for (pp = &mp->ports;
435 (p = mlock_dereference(*pp, br)) != NULL;
437 if (!p->port || p->port->dev->ifindex != entry->ifindex)
440 if (p->port->state == BR_STATE_DISABLED)
443 rcu_assign_pointer(*pp, p->next);
444 hlist_del_init(&p->mglist);
445 del_timer(&p->timer);
446 call_rcu_bh(&p->rcu, br_multicast_free_pg);
449 if (!mp->ports && !mp->mglist &&
450 netif_running(br->dev))
451 mod_timer(&mp->timer, jiffies);
456 spin_unlock_bh(&br->multicast_lock);
460 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
462 struct net_device *dev;
463 struct br_mdb_entry *entry;
464 struct net_bridge *br;
467 err = br_mdb_parse(skb, nlh, &dev, &entry);
471 br = netdev_priv(dev);
473 err = __br_mdb_del(br, entry);
475 __br_mdb_notify(dev, entry, RTM_DELMDB);
479 void br_mdb_init(void)
481 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
482 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
483 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);