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;
23 if (!br->multicast_router || hlist_empty(&br->router_list))
26 nest = nla_nest_start(skb, MDBA_ROUTER);
30 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
31 if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
35 nla_nest_end(skb, nest);
38 nla_nest_cancel(skb, nest);
42 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
43 struct net_device *dev)
45 struct net_bridge *br = netdev_priv(dev);
46 struct net_bridge_mdb_htable *mdb;
47 struct nlattr *nest, *nest2;
49 int idx = 0, s_idx = cb->args[1];
51 if (br->multicast_disabled)
54 mdb = rcu_dereference(br->mdb);
58 nest = nla_nest_start(skb, MDBA_MDB);
62 for (i = 0; i < mdb->max; i++) {
63 struct net_bridge_mdb_entry *mp;
64 struct net_bridge_port_group *p, **pp;
65 struct net_bridge_port *port;
67 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
71 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
78 (p = rcu_dereference(*pp)) != NULL;
82 struct br_mdb_entry e;
83 memset(&e, 0, sizeof(e));
84 e.ifindex = port->dev->ifindex;
86 if (p->addr.proto == htons(ETH_P_IP))
87 e.addr.u.ip4 = p->addr.u.ip4;
88 #if IS_ENABLED(CONFIG_IPV6)
89 if (p->addr.proto == htons(ETH_P_IPV6))
90 e.addr.u.ip6 = p->addr.u.ip6;
92 e.addr.proto = p->addr.proto;
93 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
94 nla_nest_cancel(skb, nest2);
100 nla_nest_end(skb, nest2);
108 nla_nest_end(skb, nest);
112 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
114 struct net_device *dev;
115 struct net *net = sock_net(skb->sk);
116 struct nlmsghdr *nlh = NULL;
123 /* In theory this could be wrapped to 0... */
124 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
126 for_each_netdev_rcu(net, dev) {
127 if (dev->priv_flags & IFF_EBRIDGE) {
128 struct br_port_msg *bpm;
133 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
134 cb->nlh->nlmsg_seq, RTM_GETMDB,
135 sizeof(*bpm), NLM_F_MULTI);
139 bpm = nlmsg_data(nlh);
140 memset(bpm, 0, sizeof(*bpm));
141 bpm->ifindex = dev->ifindex;
142 if (br_mdb_fill_info(skb, cb, dev) < 0)
144 if (br_rports_fill_info(skb, cb, dev) < 0)
162 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
163 struct net_device *dev,
164 struct br_mdb_entry *entry, u32 pid,
165 u32 seq, int type, unsigned int flags)
167 struct nlmsghdr *nlh;
168 struct br_port_msg *bpm;
169 struct nlattr *nest, *nest2;
171 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
175 bpm = nlmsg_data(nlh);
176 memset(bpm, 0, sizeof(*bpm));
177 bpm->family = AF_BRIDGE;
178 bpm->ifindex = dev->ifindex;
179 nest = nla_nest_start(skb, MDBA_MDB);
182 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
186 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
189 nla_nest_end(skb, nest2);
190 nla_nest_end(skb, nest);
191 return nlmsg_end(skb, nlh);
194 nla_nest_end(skb, nest);
196 nlmsg_cancel(skb, nlh);
200 static inline size_t rtnl_mdb_nlmsg_size(void)
202 return NLMSG_ALIGN(sizeof(struct br_port_msg))
203 + nla_total_size(sizeof(struct br_mdb_entry));
206 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
209 struct net *net = dev_net(dev);
213 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
217 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
223 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
226 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
229 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
230 struct br_ip *group, int type)
232 struct br_mdb_entry entry;
234 memset(&entry, 0, sizeof(entry));
235 entry.ifindex = port->dev->ifindex;
236 entry.addr.proto = group->proto;
237 entry.addr.u.ip4 = group->u.ip4;
238 #if IS_ENABLED(CONFIG_IPV6)
239 entry.addr.u.ip6 = group->u.ip6;
241 __br_mdb_notify(dev, &entry, type);
244 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
246 if (entry->ifindex == 0)
249 if (entry->addr.proto == htons(ETH_P_IP)) {
250 if (!ipv4_is_multicast(entry->addr.u.ip4))
252 if (ipv4_is_local_multicast(entry->addr.u.ip4))
254 #if IS_ENABLED(CONFIG_IPV6)
255 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
256 if (!ipv6_is_transient_multicast(&entry->addr.u.ip6))
261 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
267 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
268 struct net_device **pdev, struct br_mdb_entry **pentry)
270 struct net *net = sock_net(skb->sk);
271 struct br_mdb_entry *entry;
272 struct br_port_msg *bpm;
273 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
274 struct net_device *dev;
277 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY, NULL);
281 bpm = nlmsg_data(nlh);
282 if (bpm->ifindex == 0) {
283 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
287 dev = __dev_get_by_index(net, bpm->ifindex);
289 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
293 if (!(dev->priv_flags & IFF_EBRIDGE)) {
294 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
300 if (!tb[MDBA_SET_ENTRY] ||
301 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
302 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
306 entry = nla_data(tb[MDBA_SET_ENTRY]);
307 if (!is_valid_mdb_entry(entry)) {
308 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
316 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
317 struct br_ip *group, unsigned char state)
319 struct net_bridge_mdb_entry *mp;
320 struct net_bridge_port_group *p;
321 struct net_bridge_port_group __rcu **pp;
322 struct net_bridge_mdb_htable *mdb;
325 mdb = mlock_dereference(br->mdb, br);
326 mp = br_mdb_ip_get(mdb, group);
328 mp = br_multicast_new_group(br, port, group);
334 for (pp = &mp->ports;
335 (p = mlock_dereference(*pp, br)) != NULL;
339 if ((unsigned long)p->port < (unsigned long)port)
343 p = br_multicast_new_port_group(port, group, *pp, state);
346 rcu_assign_pointer(*pp, p);
348 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
352 static int __br_mdb_add(struct net *net, struct net_bridge *br,
353 struct br_mdb_entry *entry)
356 struct net_device *dev;
357 struct net_bridge_port *p;
360 if (!netif_running(br->dev) || br->multicast_disabled)
363 dev = __dev_get_by_index(net, entry->ifindex);
367 p = br_port_get_rtnl(dev);
368 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
371 ip.proto = entry->addr.proto;
372 if (ip.proto == htons(ETH_P_IP))
373 ip.u.ip4 = entry->addr.u.ip4;
374 #if IS_ENABLED(CONFIG_IPV6)
376 ip.u.ip6 = entry->addr.u.ip6;
379 spin_lock_bh(&br->multicast_lock);
380 ret = br_mdb_add_group(br, p, &ip, entry->state);
381 spin_unlock_bh(&br->multicast_lock);
385 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
387 struct net *net = sock_net(skb->sk);
388 struct br_mdb_entry *entry;
389 struct net_device *dev;
390 struct net_bridge *br;
393 err = br_mdb_parse(skb, nlh, &dev, &entry);
397 br = netdev_priv(dev);
399 err = __br_mdb_add(net, br, entry);
401 __br_mdb_notify(dev, entry, RTM_NEWMDB);
405 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
407 struct net_bridge_mdb_htable *mdb;
408 struct net_bridge_mdb_entry *mp;
409 struct net_bridge_port_group *p;
410 struct net_bridge_port_group __rcu **pp;
414 if (!netif_running(br->dev) || br->multicast_disabled)
417 if (timer_pending(&br->multicast_querier_timer))
420 ip.proto = entry->addr.proto;
421 if (ip.proto == htons(ETH_P_IP))
422 ip.u.ip4 = entry->addr.u.ip4;
423 #if IS_ENABLED(CONFIG_IPV6)
425 ip.u.ip6 = entry->addr.u.ip6;
428 spin_lock_bh(&br->multicast_lock);
429 mdb = mlock_dereference(br->mdb, br);
431 mp = br_mdb_ip_get(mdb, &ip);
435 for (pp = &mp->ports;
436 (p = mlock_dereference(*pp, br)) != NULL;
438 if (!p->port || p->port->dev->ifindex != entry->ifindex)
441 if (p->port->state == BR_STATE_DISABLED)
444 rcu_assign_pointer(*pp, p->next);
445 hlist_del_init(&p->mglist);
446 del_timer(&p->timer);
447 call_rcu_bh(&p->rcu, br_multicast_free_pg);
450 if (!mp->ports && !mp->mglist &&
451 netif_running(br->dev))
452 mod_timer(&mp->timer, jiffies);
457 spin_unlock_bh(&br->multicast_lock);
461 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
463 struct net_device *dev;
464 struct br_mdb_entry *entry;
465 struct net_bridge *br;
468 err = br_mdb_parse(skb, nlh, &dev, &entry);
472 br = netdev_priv(dev);
474 err = __br_mdb_del(br, entry);
476 __br_mdb_notify(dev, entry, RTM_DELMDB);
480 void br_mdb_init(void)
482 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
483 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
484 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
487 void br_mdb_uninit(void)
489 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
490 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
491 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);