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 #include <net/switchdev.h>
11 #if IS_ENABLED(CONFIG_IPV6)
13 #include <net/addrconf.h>
16 #include "br_private.h"
18 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
19 struct net_device *dev)
21 struct net_bridge *br = netdev_priv(dev);
22 struct net_bridge_port *p;
25 if (!br->multicast_router || hlist_empty(&br->router_list))
28 nest = nla_nest_start(skb, MDBA_ROUTER);
32 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
33 if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
37 nla_nest_end(skb, nest);
40 nla_nest_cancel(skb, nest);
44 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
45 struct net_device *dev)
47 struct net_bridge *br = netdev_priv(dev);
48 struct net_bridge_mdb_htable *mdb;
49 struct nlattr *nest, *nest2;
51 int idx = 0, s_idx = cb->args[1];
53 if (br->multicast_disabled)
56 mdb = rcu_dereference(br->mdb);
60 nest = nla_nest_start(skb, MDBA_MDB);
64 for (i = 0; i < mdb->max; i++) {
65 struct net_bridge_mdb_entry *mp;
66 struct net_bridge_port_group *p;
67 struct net_bridge_port_group __rcu **pp;
68 struct net_bridge_port *port;
70 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
74 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
81 (p = rcu_dereference(*pp)) != NULL;
85 struct br_mdb_entry e;
86 memset(&e, 0, sizeof(e));
87 e.ifindex = port->dev->ifindex;
90 if (p->addr.proto == htons(ETH_P_IP))
91 e.addr.u.ip4 = p->addr.u.ip4;
92 #if IS_ENABLED(CONFIG_IPV6)
93 if (p->addr.proto == htons(ETH_P_IPV6))
94 e.addr.u.ip6 = p->addr.u.ip6;
96 e.addr.proto = p->addr.proto;
97 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
98 nla_nest_cancel(skb, nest2);
104 nla_nest_end(skb, nest2);
112 nla_nest_end(skb, nest);
116 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
118 struct net_device *dev;
119 struct net *net = sock_net(skb->sk);
120 struct nlmsghdr *nlh = NULL;
127 /* In theory this could be wrapped to 0... */
128 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
130 for_each_netdev_rcu(net, dev) {
131 if (dev->priv_flags & IFF_EBRIDGE) {
132 struct br_port_msg *bpm;
137 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
138 cb->nlh->nlmsg_seq, RTM_GETMDB,
139 sizeof(*bpm), NLM_F_MULTI);
143 bpm = nlmsg_data(nlh);
144 memset(bpm, 0, sizeof(*bpm));
145 bpm->ifindex = dev->ifindex;
146 if (br_mdb_fill_info(skb, cb, dev) < 0)
148 if (br_rports_fill_info(skb, cb, dev) < 0)
166 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
167 struct net_device *dev,
168 struct br_mdb_entry *entry, u32 pid,
169 u32 seq, int type, unsigned int flags)
171 struct nlmsghdr *nlh;
172 struct br_port_msg *bpm;
173 struct nlattr *nest, *nest2;
175 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
179 bpm = nlmsg_data(nlh);
180 memset(bpm, 0, sizeof(*bpm));
181 bpm->family = AF_BRIDGE;
182 bpm->ifindex = dev->ifindex;
183 nest = nla_nest_start(skb, MDBA_MDB);
186 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
190 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
193 nla_nest_end(skb, nest2);
194 nla_nest_end(skb, nest);
199 nla_nest_end(skb, nest);
201 nlmsg_cancel(skb, nlh);
205 static inline size_t rtnl_mdb_nlmsg_size(void)
207 return NLMSG_ALIGN(sizeof(struct br_port_msg))
208 + nla_total_size(sizeof(struct br_mdb_entry));
211 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
214 struct switchdev_obj_port_mdb mdb = {
216 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
217 .flags = SWITCHDEV_F_DEFER,
221 struct net_device *port_dev;
222 struct net *net = dev_net(dev);
226 port_dev = __dev_get_by_index(net, entry->ifindex);
227 if (entry->addr.proto == htons(ETH_P_IP))
228 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
229 #if IS_ENABLED(CONFIG_IPV6)
231 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
234 mdb.obj.orig_dev = port_dev;
235 if (port_dev && type == RTM_NEWMDB)
236 switchdev_port_obj_add(port_dev, &mdb.obj);
237 else if (port_dev && type == RTM_DELMDB)
238 switchdev_port_obj_del(port_dev, &mdb.obj);
240 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
244 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
250 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
253 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
256 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
257 struct br_ip *group, int type, u8 state)
259 struct br_mdb_entry entry;
261 memset(&entry, 0, sizeof(entry));
262 entry.ifindex = port->dev->ifindex;
263 entry.addr.proto = group->proto;
264 entry.addr.u.ip4 = group->u.ip4;
265 #if IS_ENABLED(CONFIG_IPV6)
266 entry.addr.u.ip6 = group->u.ip6;
269 entry.vid = group->vid;
270 __br_mdb_notify(dev, &entry, type);
273 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
274 struct net_device *dev,
275 int ifindex, u32 pid,
276 u32 seq, int type, unsigned int flags)
278 struct br_port_msg *bpm;
279 struct nlmsghdr *nlh;
282 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
286 bpm = nlmsg_data(nlh);
287 memset(bpm, 0, sizeof(*bpm));
288 bpm->family = AF_BRIDGE;
289 bpm->ifindex = dev->ifindex;
290 nest = nla_nest_start(skb, MDBA_ROUTER);
294 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
297 nla_nest_end(skb, nest);
302 nla_nest_end(skb, nest);
304 nlmsg_cancel(skb, nlh);
308 static inline size_t rtnl_rtr_nlmsg_size(void)
310 return NLMSG_ALIGN(sizeof(struct br_port_msg))
311 + nla_total_size(sizeof(__u32));
314 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
317 struct net *net = dev_net(dev);
322 ifindex = port ? port->dev->ifindex : 0;
323 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
327 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
333 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
337 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
340 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
342 if (entry->ifindex == 0)
345 if (entry->addr.proto == htons(ETH_P_IP)) {
346 if (!ipv4_is_multicast(entry->addr.u.ip4))
348 if (ipv4_is_local_multicast(entry->addr.u.ip4))
350 #if IS_ENABLED(CONFIG_IPV6)
351 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
352 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
357 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
359 if (entry->vid >= VLAN_VID_MASK)
365 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
366 struct net_device **pdev, struct br_mdb_entry **pentry)
368 struct net *net = sock_net(skb->sk);
369 struct br_mdb_entry *entry;
370 struct br_port_msg *bpm;
371 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
372 struct net_device *dev;
375 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
379 bpm = nlmsg_data(nlh);
380 if (bpm->ifindex == 0) {
381 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
385 dev = __dev_get_by_index(net, bpm->ifindex);
387 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
391 if (!(dev->priv_flags & IFF_EBRIDGE)) {
392 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
398 if (!tb[MDBA_SET_ENTRY] ||
399 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
400 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
404 entry = nla_data(tb[MDBA_SET_ENTRY]);
405 if (!is_valid_mdb_entry(entry)) {
406 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
414 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
415 struct br_ip *group, unsigned char state)
417 struct net_bridge_mdb_entry *mp;
418 struct net_bridge_port_group *p;
419 struct net_bridge_port_group __rcu **pp;
420 struct net_bridge_mdb_htable *mdb;
421 unsigned long now = jiffies;
424 mdb = mlock_dereference(br->mdb, br);
425 mp = br_mdb_ip_get(mdb, group);
427 mp = br_multicast_new_group(br, port, group);
433 for (pp = &mp->ports;
434 (p = mlock_dereference(*pp, br)) != NULL;
438 if ((unsigned long)p->port < (unsigned long)port)
442 p = br_multicast_new_port_group(port, group, *pp, state);
445 rcu_assign_pointer(*pp, p);
446 if (state == MDB_TEMPORARY)
447 mod_timer(&p->timer, now + br->multicast_membership_interval);
452 static int __br_mdb_add(struct net *net, struct net_bridge *br,
453 struct br_mdb_entry *entry)
456 struct net_device *dev;
457 struct net_bridge_port *p;
460 if (!netif_running(br->dev) || br->multicast_disabled)
463 dev = __dev_get_by_index(net, entry->ifindex);
467 p = br_port_get_rtnl(dev);
468 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
471 memset(&ip, 0, sizeof(ip));
473 ip.proto = entry->addr.proto;
474 if (ip.proto == htons(ETH_P_IP))
475 ip.u.ip4 = entry->addr.u.ip4;
476 #if IS_ENABLED(CONFIG_IPV6)
478 ip.u.ip6 = entry->addr.u.ip6;
481 spin_lock_bh(&br->multicast_lock);
482 ret = br_mdb_add_group(br, p, &ip, entry->state);
483 spin_unlock_bh(&br->multicast_lock);
487 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
489 struct net *net = sock_net(skb->sk);
490 struct net_bridge_vlan_group *vg;
491 struct net_device *dev, *pdev;
492 struct br_mdb_entry *entry;
493 struct net_bridge_port *p;
494 struct net_bridge_vlan *v;
495 struct net_bridge *br;
498 err = br_mdb_parse(skb, nlh, &dev, &entry);
502 br = netdev_priv(dev);
504 /* If vlan filtering is enabled and VLAN is not specified
505 * install mdb entry on all vlans configured on the port.
507 pdev = __dev_get_by_index(net, entry->ifindex);
511 p = br_port_get_rtnl(pdev);
512 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
515 vg = nbp_vlan_group(p);
516 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
517 list_for_each_entry(v, &vg->vlan_list, vlist) {
519 err = __br_mdb_add(net, br, entry);
522 __br_mdb_notify(dev, entry, RTM_NEWMDB);
525 err = __br_mdb_add(net, br, entry);
527 __br_mdb_notify(dev, entry, RTM_NEWMDB);
533 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
535 struct net_bridge_mdb_htable *mdb;
536 struct net_bridge_mdb_entry *mp;
537 struct net_bridge_port_group *p;
538 struct net_bridge_port_group __rcu **pp;
542 if (!netif_running(br->dev) || br->multicast_disabled)
545 memset(&ip, 0, sizeof(ip));
547 ip.proto = entry->addr.proto;
548 if (ip.proto == htons(ETH_P_IP))
549 ip.u.ip4 = entry->addr.u.ip4;
550 #if IS_ENABLED(CONFIG_IPV6)
552 ip.u.ip6 = entry->addr.u.ip6;
555 spin_lock_bh(&br->multicast_lock);
556 mdb = mlock_dereference(br->mdb, br);
558 mp = br_mdb_ip_get(mdb, &ip);
562 for (pp = &mp->ports;
563 (p = mlock_dereference(*pp, br)) != NULL;
565 if (!p->port || p->port->dev->ifindex != entry->ifindex)
568 if (p->port->state == BR_STATE_DISABLED)
571 entry->state = p->state;
572 rcu_assign_pointer(*pp, p->next);
573 hlist_del_init(&p->mglist);
574 del_timer(&p->timer);
575 call_rcu_bh(&p->rcu, br_multicast_free_pg);
578 if (!mp->ports && !mp->mglist &&
579 netif_running(br->dev))
580 mod_timer(&mp->timer, jiffies);
585 spin_unlock_bh(&br->multicast_lock);
589 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
591 struct net *net = sock_net(skb->sk);
592 struct net_bridge_vlan_group *vg;
593 struct net_device *dev, *pdev;
594 struct br_mdb_entry *entry;
595 struct net_bridge_port *p;
596 struct net_bridge_vlan *v;
597 struct net_bridge *br;
600 err = br_mdb_parse(skb, nlh, &dev, &entry);
604 br = netdev_priv(dev);
606 /* If vlan filtering is enabled and VLAN is not specified
607 * delete mdb entry on all vlans configured on the port.
609 pdev = __dev_get_by_index(net, entry->ifindex);
613 p = br_port_get_rtnl(pdev);
614 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
617 vg = nbp_vlan_group(p);
618 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
619 list_for_each_entry(v, &vg->vlan_list, vlist) {
621 err = __br_mdb_del(br, entry);
623 __br_mdb_notify(dev, entry, RTM_DELMDB);
626 err = __br_mdb_del(br, entry);
628 __br_mdb_notify(dev, entry, RTM_DELMDB);
634 void br_mdb_init(void)
636 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
637 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
638 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
641 void br_mdb_uninit(void)
643 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
644 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
645 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);