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 void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
46 e->state = flags & MDB_PG_FLAGS_PERMANENT;
48 if (flags & MDB_PG_FLAGS_OFFLOAD)
49 e->flags |= MDB_FLAGS_OFFLOAD;
52 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
53 struct net_device *dev)
55 struct net_bridge *br = netdev_priv(dev);
56 struct net_bridge_mdb_htable *mdb;
57 struct nlattr *nest, *nest2;
59 int idx = 0, s_idx = cb->args[1];
61 if (br->multicast_disabled)
64 mdb = rcu_dereference(br->mdb);
68 nest = nla_nest_start(skb, MDBA_MDB);
72 for (i = 0; i < mdb->max; i++) {
73 struct net_bridge_mdb_entry *mp;
74 struct net_bridge_port_group *p;
75 struct net_bridge_port_group __rcu **pp;
76 struct net_bridge_port *port;
78 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
82 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
89 (p = rcu_dereference(*pp)) != NULL;
93 struct br_mdb_entry e;
94 memset(&e, 0, sizeof(e));
95 e.ifindex = port->dev->ifindex;
97 __mdb_entry_fill_flags(&e, p->flags);
98 if (p->addr.proto == htons(ETH_P_IP))
99 e.addr.u.ip4 = p->addr.u.ip4;
100 #if IS_ENABLED(CONFIG_IPV6)
101 if (p->addr.proto == htons(ETH_P_IPV6))
102 e.addr.u.ip6 = p->addr.u.ip6;
104 e.addr.proto = p->addr.proto;
105 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
106 nla_nest_cancel(skb, nest2);
112 nla_nest_end(skb, nest2);
120 nla_nest_end(skb, nest);
124 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
126 struct net_device *dev;
127 struct net *net = sock_net(skb->sk);
128 struct nlmsghdr *nlh = NULL;
135 /* In theory this could be wrapped to 0... */
136 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
138 for_each_netdev_rcu(net, dev) {
139 if (dev->priv_flags & IFF_EBRIDGE) {
140 struct br_port_msg *bpm;
145 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
146 cb->nlh->nlmsg_seq, RTM_GETMDB,
147 sizeof(*bpm), NLM_F_MULTI);
151 bpm = nlmsg_data(nlh);
152 memset(bpm, 0, sizeof(*bpm));
153 bpm->ifindex = dev->ifindex;
154 if (br_mdb_fill_info(skb, cb, dev) < 0)
156 if (br_rports_fill_info(skb, cb, dev) < 0)
174 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
175 struct net_device *dev,
176 struct br_mdb_entry *entry, u32 pid,
177 u32 seq, int type, unsigned int flags)
179 struct nlmsghdr *nlh;
180 struct br_port_msg *bpm;
181 struct nlattr *nest, *nest2;
183 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
187 bpm = nlmsg_data(nlh);
188 memset(bpm, 0, sizeof(*bpm));
189 bpm->family = AF_BRIDGE;
190 bpm->ifindex = dev->ifindex;
191 nest = nla_nest_start(skb, MDBA_MDB);
194 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
198 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
201 nla_nest_end(skb, nest2);
202 nla_nest_end(skb, nest);
207 nla_nest_end(skb, nest);
209 nlmsg_cancel(skb, nlh);
213 static inline size_t rtnl_mdb_nlmsg_size(void)
215 return NLMSG_ALIGN(sizeof(struct br_port_msg))
216 + nla_total_size(sizeof(struct br_mdb_entry));
219 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
220 int type, struct net_bridge_port_group *pg)
222 struct switchdev_obj_port_mdb mdb = {
224 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
225 .flags = SWITCHDEV_F_DEFER,
229 struct net_device *port_dev;
230 struct net *net = dev_net(dev);
234 port_dev = __dev_get_by_index(net, entry->ifindex);
235 if (entry->addr.proto == htons(ETH_P_IP))
236 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
237 #if IS_ENABLED(CONFIG_IPV6)
239 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
242 mdb.obj.orig_dev = port_dev;
243 if (port_dev && type == RTM_NEWMDB) {
244 err = switchdev_port_obj_add(port_dev, &mdb.obj);
246 pg->flags |= MDB_PG_FLAGS_OFFLOAD;
247 } else if (port_dev && type == RTM_DELMDB) {
248 switchdev_port_obj_del(port_dev, &mdb.obj);
251 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
255 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
261 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
264 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
267 void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
270 struct br_mdb_entry entry;
272 memset(&entry, 0, sizeof(entry));
273 entry.ifindex = pg->port->dev->ifindex;
274 entry.addr.proto = pg->addr.proto;
275 entry.addr.u.ip4 = pg->addr.u.ip4;
276 #if IS_ENABLED(CONFIG_IPV6)
277 entry.addr.u.ip6 = pg->addr.u.ip6;
279 entry.vid = pg->addr.vid;
280 __mdb_entry_fill_flags(&entry, pg->flags);
281 __br_mdb_notify(dev, &entry, type, pg);
284 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
285 struct net_device *dev,
286 int ifindex, u32 pid,
287 u32 seq, int type, unsigned int flags)
289 struct br_port_msg *bpm;
290 struct nlmsghdr *nlh;
293 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
297 bpm = nlmsg_data(nlh);
298 memset(bpm, 0, sizeof(*bpm));
299 bpm->family = AF_BRIDGE;
300 bpm->ifindex = dev->ifindex;
301 nest = nla_nest_start(skb, MDBA_ROUTER);
305 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
308 nla_nest_end(skb, nest);
313 nla_nest_end(skb, nest);
315 nlmsg_cancel(skb, nlh);
319 static inline size_t rtnl_rtr_nlmsg_size(void)
321 return NLMSG_ALIGN(sizeof(struct br_port_msg))
322 + nla_total_size(sizeof(__u32));
325 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
328 struct net *net = dev_net(dev);
333 ifindex = port ? port->dev->ifindex : 0;
334 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
338 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
344 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
348 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
351 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
353 if (entry->ifindex == 0)
356 if (entry->addr.proto == htons(ETH_P_IP)) {
357 if (!ipv4_is_multicast(entry->addr.u.ip4))
359 if (ipv4_is_local_multicast(entry->addr.u.ip4))
361 #if IS_ENABLED(CONFIG_IPV6)
362 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
363 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
368 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
370 if (entry->vid >= VLAN_VID_MASK)
376 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
377 struct net_device **pdev, struct br_mdb_entry **pentry)
379 struct net *net = sock_net(skb->sk);
380 struct br_mdb_entry *entry;
381 struct br_port_msg *bpm;
382 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
383 struct net_device *dev;
386 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
390 bpm = nlmsg_data(nlh);
391 if (bpm->ifindex == 0) {
392 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
396 dev = __dev_get_by_index(net, bpm->ifindex);
398 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
402 if (!(dev->priv_flags & IFF_EBRIDGE)) {
403 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
409 if (!tb[MDBA_SET_ENTRY] ||
410 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
411 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
415 entry = nla_data(tb[MDBA_SET_ENTRY]);
416 if (!is_valid_mdb_entry(entry)) {
417 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
425 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
426 struct br_ip *group, unsigned char state,
427 struct net_bridge_port_group **pg)
429 struct net_bridge_mdb_entry *mp;
430 struct net_bridge_port_group *p;
431 struct net_bridge_port_group __rcu **pp;
432 struct net_bridge_mdb_htable *mdb;
433 unsigned long now = jiffies;
436 mdb = mlock_dereference(br->mdb, br);
437 mp = br_mdb_ip_get(mdb, group);
439 mp = br_multicast_new_group(br, port, group);
445 for (pp = &mp->ports;
446 (p = mlock_dereference(*pp, br)) != NULL;
450 if ((unsigned long)p->port < (unsigned long)port)
454 p = br_multicast_new_port_group(port, group, *pp, state);
457 rcu_assign_pointer(*pp, p);
459 if (state == MDB_TEMPORARY)
460 mod_timer(&p->timer, now + br->multicast_membership_interval);
465 static int __br_mdb_add(struct net *net, struct net_bridge *br,
466 struct br_mdb_entry *entry,
467 struct net_bridge_port_group **pg)
470 struct net_device *dev;
471 struct net_bridge_port *p;
474 if (!netif_running(br->dev) || br->multicast_disabled)
477 dev = __dev_get_by_index(net, entry->ifindex);
481 p = br_port_get_rtnl(dev);
482 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
485 memset(&ip, 0, sizeof(ip));
487 ip.proto = entry->addr.proto;
488 if (ip.proto == htons(ETH_P_IP))
489 ip.u.ip4 = entry->addr.u.ip4;
490 #if IS_ENABLED(CONFIG_IPV6)
492 ip.u.ip6 = entry->addr.u.ip6;
495 spin_lock_bh(&br->multicast_lock);
496 ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
497 spin_unlock_bh(&br->multicast_lock);
501 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
503 struct net *net = sock_net(skb->sk);
504 struct net_bridge_port_group *pg;
505 struct net_bridge_vlan_group *vg;
506 struct net_device *dev, *pdev;
507 struct br_mdb_entry *entry;
508 struct net_bridge_port *p;
509 struct net_bridge_vlan *v;
510 struct net_bridge *br;
513 err = br_mdb_parse(skb, nlh, &dev, &entry);
517 br = netdev_priv(dev);
519 /* If vlan filtering is enabled and VLAN is not specified
520 * install mdb entry on all vlans configured on the port.
522 pdev = __dev_get_by_index(net, entry->ifindex);
526 p = br_port_get_rtnl(pdev);
527 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
530 vg = nbp_vlan_group(p);
531 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
532 list_for_each_entry(v, &vg->vlan_list, vlist) {
534 err = __br_mdb_add(net, br, entry, &pg);
537 __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
540 err = __br_mdb_add(net, br, entry, &pg);
542 __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
548 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
550 struct net_bridge_mdb_htable *mdb;
551 struct net_bridge_mdb_entry *mp;
552 struct net_bridge_port_group *p;
553 struct net_bridge_port_group __rcu **pp;
557 if (!netif_running(br->dev) || br->multicast_disabled)
560 memset(&ip, 0, sizeof(ip));
562 ip.proto = entry->addr.proto;
563 if (ip.proto == htons(ETH_P_IP))
564 ip.u.ip4 = entry->addr.u.ip4;
565 #if IS_ENABLED(CONFIG_IPV6)
567 ip.u.ip6 = entry->addr.u.ip6;
570 spin_lock_bh(&br->multicast_lock);
571 mdb = mlock_dereference(br->mdb, br);
573 mp = br_mdb_ip_get(mdb, &ip);
577 for (pp = &mp->ports;
578 (p = mlock_dereference(*pp, br)) != NULL;
580 if (!p->port || p->port->dev->ifindex != entry->ifindex)
583 if (p->port->state == BR_STATE_DISABLED)
586 __mdb_entry_fill_flags(entry, p->flags);
587 rcu_assign_pointer(*pp, p->next);
588 hlist_del_init(&p->mglist);
589 del_timer(&p->timer);
590 call_rcu_bh(&p->rcu, br_multicast_free_pg);
593 if (!mp->ports && !mp->mglist &&
594 netif_running(br->dev))
595 mod_timer(&mp->timer, jiffies);
600 spin_unlock_bh(&br->multicast_lock);
604 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
606 struct net *net = sock_net(skb->sk);
607 struct net_bridge_vlan_group *vg;
608 struct net_device *dev, *pdev;
609 struct br_mdb_entry *entry;
610 struct net_bridge_port *p;
611 struct net_bridge_vlan *v;
612 struct net_bridge *br;
615 err = br_mdb_parse(skb, nlh, &dev, &entry);
619 br = netdev_priv(dev);
621 /* If vlan filtering is enabled and VLAN is not specified
622 * delete mdb entry on all vlans configured on the port.
624 pdev = __dev_get_by_index(net, entry->ifindex);
628 p = br_port_get_rtnl(pdev);
629 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
632 vg = nbp_vlan_group(p);
633 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
634 list_for_each_entry(v, &vg->vlan_list, vlist) {
636 err = __br_mdb_del(br, entry);
638 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
641 err = __br_mdb_del(br, entry);
643 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
649 void br_mdb_init(void)
651 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
652 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
653 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
656 void br_mdb_uninit(void)
658 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
659 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
660 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);