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 if (p->addr.proto == htons(ETH_P_IP))
88 e.addr.u.ip4 = p->addr.u.ip4;
89 #if IS_ENABLED(CONFIG_IPV6)
90 if (p->addr.proto == htons(ETH_P_IPV6))
91 e.addr.u.ip6 = p->addr.u.ip6;
93 e.addr.proto = p->addr.proto;
94 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
95 nla_nest_cancel(skb, nest2);
101 nla_nest_end(skb, nest2);
109 nla_nest_end(skb, nest);
113 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
115 struct net_device *dev;
116 struct net *net = sock_net(skb->sk);
117 struct nlmsghdr *nlh = NULL;
124 /* In theory this could be wrapped to 0... */
125 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
127 for_each_netdev_rcu(net, dev) {
128 if (dev->priv_flags & IFF_EBRIDGE) {
129 struct br_port_msg *bpm;
134 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
135 cb->nlh->nlmsg_seq, RTM_GETMDB,
136 sizeof(*bpm), NLM_F_MULTI);
140 bpm = nlmsg_data(nlh);
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 bpm->family = AF_BRIDGE;
177 bpm->ifindex = dev->ifindex;
178 nest = nla_nest_start(skb, MDBA_MDB);
181 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
185 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
188 nla_nest_end(skb, nest2);
189 nla_nest_end(skb, nest);
190 return nlmsg_end(skb, nlh);
193 nla_nest_end(skb, nest);
195 nlmsg_cancel(skb, nlh);
199 static inline size_t rtnl_mdb_nlmsg_size(void)
201 return NLMSG_ALIGN(sizeof(struct br_port_msg))
202 + nla_total_size(sizeof(struct br_mdb_entry));
205 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
208 struct net *net = dev_net(dev);
212 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
216 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
222 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
225 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
228 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
229 struct br_ip *group, int type)
231 struct br_mdb_entry entry;
233 entry.ifindex = port->dev->ifindex;
234 entry.addr.proto = group->proto;
235 entry.addr.u.ip4 = group->u.ip4;
236 #if IS_ENABLED(CONFIG_IPV6)
237 entry.addr.u.ip6 = group->u.ip6;
239 __br_mdb_notify(dev, &entry, type);
242 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
244 if (entry->ifindex == 0)
247 if (entry->addr.proto == htons(ETH_P_IP)) {
248 if (!ipv4_is_multicast(entry->addr.u.ip4))
250 if (ipv4_is_local_multicast(entry->addr.u.ip4))
252 #if IS_ENABLED(CONFIG_IPV6)
253 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
254 if (!ipv6_is_transient_multicast(&entry->addr.u.ip6))
259 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
265 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
266 struct net_device **pdev, struct br_mdb_entry **pentry)
268 struct net *net = sock_net(skb->sk);
269 struct br_mdb_entry *entry;
270 struct br_port_msg *bpm;
271 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
272 struct net_device *dev;
275 if (!capable(CAP_NET_ADMIN))
278 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY, NULL);
282 bpm = nlmsg_data(nlh);
283 if (bpm->ifindex == 0) {
284 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
288 dev = __dev_get_by_index(net, bpm->ifindex);
290 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
294 if (!(dev->priv_flags & IFF_EBRIDGE)) {
295 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
301 if (!tb[MDBA_SET_ENTRY] ||
302 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
303 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
307 entry = nla_data(tb[MDBA_SET_ENTRY]);
308 if (!is_valid_mdb_entry(entry)) {
309 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
317 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
318 struct br_ip *group, unsigned char state)
320 struct net_bridge_mdb_entry *mp;
321 struct net_bridge_port_group *p;
322 struct net_bridge_port_group __rcu **pp;
323 struct net_bridge_mdb_htable *mdb;
326 mdb = mlock_dereference(br->mdb, br);
327 mp = br_mdb_ip_get(mdb, group);
329 mp = br_multicast_new_group(br, port, group);
335 for (pp = &mp->ports;
336 (p = mlock_dereference(*pp, br)) != NULL;
340 if ((unsigned long)p->port < (unsigned long)port)
344 p = br_multicast_new_port_group(port, group, *pp, state);
347 rcu_assign_pointer(*pp, p);
349 br_mdb_notify(br->dev, port, group, RTM_NEWMDB);
353 static int __br_mdb_add(struct net *net, struct net_bridge *br,
354 struct br_mdb_entry *entry)
357 struct net_device *dev;
358 struct net_bridge_port *p;
361 if (!netif_running(br->dev) || br->multicast_disabled)
364 dev = __dev_get_by_index(net, entry->ifindex);
368 p = br_port_get_rtnl(dev);
369 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
372 ip.proto = entry->addr.proto;
373 if (ip.proto == htons(ETH_P_IP))
374 ip.u.ip4 = entry->addr.u.ip4;
375 #if IS_ENABLED(CONFIG_IPV6)
377 ip.u.ip6 = entry->addr.u.ip6;
380 spin_lock_bh(&br->multicast_lock);
381 ret = br_mdb_add_group(br, p, &ip, entry->state);
382 spin_unlock_bh(&br->multicast_lock);
386 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
388 struct net *net = sock_net(skb->sk);
389 struct br_mdb_entry *entry;
390 struct net_device *dev;
391 struct net_bridge *br;
394 err = br_mdb_parse(skb, nlh, &dev, &entry);
398 br = netdev_priv(dev);
400 err = __br_mdb_add(net, br, entry);
402 __br_mdb_notify(dev, entry, RTM_NEWMDB);
406 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
408 struct net_bridge_mdb_htable *mdb;
409 struct net_bridge_mdb_entry *mp;
410 struct net_bridge_port_group *p;
411 struct net_bridge_port_group __rcu **pp;
415 if (!netif_running(br->dev) || br->multicast_disabled)
418 if (timer_pending(&br->multicast_querier_timer))
421 ip.proto = entry->addr.proto;
422 if (ip.proto == htons(ETH_P_IP))
423 ip.u.ip4 = entry->addr.u.ip4;
424 #if IS_ENABLED(CONFIG_IPV6)
426 ip.u.ip6 = entry->addr.u.ip6;
429 spin_lock_bh(&br->multicast_lock);
430 mdb = mlock_dereference(br->mdb, br);
432 mp = br_mdb_ip_get(mdb, &ip);
436 for (pp = &mp->ports;
437 (p = mlock_dereference(*pp, br)) != NULL;
439 if (!p->port || p->port->dev->ifindex != entry->ifindex)
442 if (p->port->state == BR_STATE_DISABLED)
445 rcu_assign_pointer(*pp, p->next);
446 hlist_del_init(&p->mglist);
447 del_timer(&p->timer);
448 call_rcu_bh(&p->rcu, br_multicast_free_pg);
451 if (!mp->ports && !mp->mglist &&
452 netif_running(br->dev))
453 mod_timer(&mp->timer, jiffies);
458 spin_unlock_bh(&br->multicast_lock);
462 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
464 struct net_device *dev;
465 struct br_mdb_entry *entry;
466 struct net_bridge *br;
469 err = br_mdb_parse(skb, nlh, &dev, &entry);
473 br = netdev_priv(dev);
475 err = __br_mdb_del(br, entry);
477 __br_mdb_notify(dev, entry, RTM_DELMDB);
481 void br_mdb_init(void)
483 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
484 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
485 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
488 void br_mdb_uninit(void)
490 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
491 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
492 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);