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)
12 #include <net/addrconf.h>
15 #include "br_private.h"
17 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
18 struct net_device *dev)
20 struct net_bridge *br = netdev_priv(dev);
21 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, &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++) {
64 struct net_bridge_mdb_entry *mp;
65 struct net_bridge_port_group *p;
66 struct net_bridge_port_group __rcu **pp;
67 struct net_bridge_port *port;
69 hlist_for_each_entry_rcu(mp, &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 memset(&e, 0, sizeof(e));
86 e.ifindex = port->dev->ifindex;
88 if (p->addr.proto == htons(ETH_P_IP))
89 e.addr.u.ip4 = p->addr.u.ip4;
90 #if IS_ENABLED(CONFIG_IPV6)
91 if (p->addr.proto == htons(ETH_P_IPV6))
92 e.addr.u.ip6 = p->addr.u.ip6;
94 e.addr.proto = p->addr.proto;
95 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
96 nla_nest_cancel(skb, nest2);
102 nla_nest_end(skb, nest2);
110 nla_nest_end(skb, nest);
114 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
116 struct net_device *dev;
117 struct net *net = sock_net(skb->sk);
118 struct nlmsghdr *nlh = NULL;
125 /* In theory this could be wrapped to 0... */
126 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
128 for_each_netdev_rcu(net, dev) {
129 if (dev->priv_flags & IFF_EBRIDGE) {
130 struct br_port_msg *bpm;
135 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
136 cb->nlh->nlmsg_seq, RTM_GETMDB,
137 sizeof(*bpm), NLM_F_MULTI);
141 bpm = nlmsg_data(nlh);
142 memset(bpm, 0, sizeof(*bpm));
143 bpm->ifindex = dev->ifindex;
144 if (br_mdb_fill_info(skb, cb, dev) < 0)
146 if (br_rports_fill_info(skb, cb, dev) < 0)
164 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
165 struct net_device *dev,
166 struct br_mdb_entry *entry, u32 pid,
167 u32 seq, int type, unsigned int flags)
169 struct nlmsghdr *nlh;
170 struct br_port_msg *bpm;
171 struct nlattr *nest, *nest2;
173 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
177 bpm = nlmsg_data(nlh);
178 memset(bpm, 0, sizeof(*bpm));
179 bpm->family = AF_BRIDGE;
180 bpm->ifindex = dev->ifindex;
181 nest = nla_nest_start(skb, MDBA_MDB);
184 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
188 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
191 nla_nest_end(skb, nest2);
192 nla_nest_end(skb, nest);
197 nla_nest_end(skb, nest);
199 nlmsg_cancel(skb, nlh);
203 static inline size_t rtnl_mdb_nlmsg_size(void)
205 return NLMSG_ALIGN(sizeof(struct br_port_msg))
206 + nla_total_size(sizeof(struct br_mdb_entry));
209 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
212 struct net *net = dev_net(dev);
216 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
220 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
226 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
229 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
232 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
233 struct br_ip *group, int type)
235 struct br_mdb_entry entry;
237 memset(&entry, 0, sizeof(entry));
238 entry.ifindex = port->dev->ifindex;
239 entry.addr.proto = group->proto;
240 entry.addr.u.ip4 = group->u.ip4;
241 #if IS_ENABLED(CONFIG_IPV6)
242 entry.addr.u.ip6 = group->u.ip6;
244 __br_mdb_notify(dev, &entry, type);
247 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
249 if (entry->ifindex == 0)
252 if (entry->addr.proto == htons(ETH_P_IP)) {
253 if (!ipv4_is_multicast(entry->addr.u.ip4))
255 if (ipv4_is_local_multicast(entry->addr.u.ip4))
257 #if IS_ENABLED(CONFIG_IPV6)
258 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
259 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
264 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
270 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
271 struct net_device **pdev, struct br_mdb_entry **pentry)
273 struct net *net = sock_net(skb->sk);
274 struct br_mdb_entry *entry;
275 struct br_port_msg *bpm;
276 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
277 struct net_device *dev;
280 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
284 bpm = nlmsg_data(nlh);
285 if (bpm->ifindex == 0) {
286 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
290 dev = __dev_get_by_index(net, bpm->ifindex);
292 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
296 if (!(dev->priv_flags & IFF_EBRIDGE)) {
297 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
303 if (!tb[MDBA_SET_ENTRY] ||
304 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
305 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
309 entry = nla_data(tb[MDBA_SET_ENTRY]);
310 if (!is_valid_mdb_entry(entry)) {
311 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
319 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
320 struct br_ip *group, unsigned char state)
322 struct net_bridge_mdb_entry *mp;
323 struct net_bridge_port_group *p;
324 struct net_bridge_port_group __rcu **pp;
325 struct net_bridge_mdb_htable *mdb;
326 unsigned long now = jiffies;
329 mdb = mlock_dereference(br->mdb, br);
330 mp = br_mdb_ip_get(mdb, group);
332 mp = br_multicast_new_group(br, port, group);
338 for (pp = &mp->ports;
339 (p = mlock_dereference(*pp, br)) != NULL;
343 if ((unsigned long)p->port < (unsigned long)port)
347 p = br_multicast_new_port_group(port, group, *pp, state);
350 rcu_assign_pointer(*pp, p);
351 if (state == MDB_TEMPORARY)
352 mod_timer(&p->timer, now + br->multicast_membership_interval);
357 static int __br_mdb_add(struct net *net, struct net_bridge *br,
358 struct br_mdb_entry *entry)
361 struct net_device *dev;
362 struct net_bridge_port *p;
365 if (!netif_running(br->dev) || br->multicast_disabled)
368 dev = __dev_get_by_index(net, entry->ifindex);
372 p = br_port_get_rtnl(dev);
373 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
376 memset(&ip, 0, sizeof(ip));
377 ip.proto = entry->addr.proto;
378 if (ip.proto == htons(ETH_P_IP))
379 ip.u.ip4 = entry->addr.u.ip4;
380 #if IS_ENABLED(CONFIG_IPV6)
382 ip.u.ip6 = entry->addr.u.ip6;
385 spin_lock_bh(&br->multicast_lock);
386 ret = br_mdb_add_group(br, p, &ip, entry->state);
387 spin_unlock_bh(&br->multicast_lock);
391 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
393 struct net *net = sock_net(skb->sk);
394 struct br_mdb_entry *entry;
395 struct net_device *dev;
396 struct net_bridge *br;
399 err = br_mdb_parse(skb, nlh, &dev, &entry);
403 br = netdev_priv(dev);
405 err = __br_mdb_add(net, br, entry);
407 __br_mdb_notify(dev, entry, RTM_NEWMDB);
411 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
413 struct net_bridge_mdb_htable *mdb;
414 struct net_bridge_mdb_entry *mp;
415 struct net_bridge_port_group *p;
416 struct net_bridge_port_group __rcu **pp;
420 if (!netif_running(br->dev) || br->multicast_disabled)
423 memset(&ip, 0, sizeof(ip));
424 ip.proto = entry->addr.proto;
425 if (ip.proto == htons(ETH_P_IP))
426 ip.u.ip4 = entry->addr.u.ip4;
427 #if IS_ENABLED(CONFIG_IPV6)
429 ip.u.ip6 = entry->addr.u.ip6;
432 spin_lock_bh(&br->multicast_lock);
433 mdb = mlock_dereference(br->mdb, br);
435 mp = br_mdb_ip_get(mdb, &ip);
439 for (pp = &mp->ports;
440 (p = mlock_dereference(*pp, br)) != NULL;
442 if (!p->port || p->port->dev->ifindex != entry->ifindex)
445 if (p->port->state == BR_STATE_DISABLED)
448 entry->state = p->state;
449 rcu_assign_pointer(*pp, p->next);
450 hlist_del_init(&p->mglist);
451 del_timer(&p->timer);
452 call_rcu_bh(&p->rcu, br_multicast_free_pg);
455 if (!mp->ports && !mp->mglist &&
456 netif_running(br->dev))
457 mod_timer(&mp->timer, jiffies);
462 spin_unlock_bh(&br->multicast_lock);
466 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
468 struct net_device *dev;
469 struct br_mdb_entry *entry;
470 struct net_bridge *br;
473 err = br_mdb_parse(skb, nlh, &dev, &entry);
477 br = netdev_priv(dev);
479 err = __br_mdb_del(br, entry);
481 __br_mdb_notify(dev, entry, RTM_DELMDB);
485 void br_mdb_init(void)
487 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
488 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
489 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
492 void br_mdb_uninit(void)
494 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
495 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
496 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);