1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/igmp.h>
4 #include <linux/kernel.h>
5 #include <linux/netdevice.h>
6 #include <linux/rculist.h>
7 #include <linux/skbuff.h>
8 #include <linux/if_ether.h>
10 #include <net/netlink.h>
11 #include <net/switchdev.h>
12 #if IS_ENABLED(CONFIG_IPV6)
14 #include <net/addrconf.h>
17 #include "br_private.h"
19 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
20 struct net_device *dev)
22 struct net_bridge *br = netdev_priv(dev);
23 struct net_bridge_port *p;
24 struct nlattr *nest, *port_nest;
26 if (!br->multicast_router || hlist_empty(&br->router_list))
29 nest = nla_nest_start(skb, MDBA_ROUTER);
33 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
36 port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
39 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
40 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
41 br_timer_value(&p->multicast_router_timer)) ||
42 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
43 p->multicast_router)) {
44 nla_nest_cancel(skb, port_nest);
47 nla_nest_end(skb, port_nest);
50 nla_nest_end(skb, nest);
53 nla_nest_cancel(skb, nest);
57 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
59 e->state = flags & MDB_PG_FLAGS_PERMANENT;
61 if (flags & MDB_PG_FLAGS_OFFLOAD)
62 e->flags |= MDB_FLAGS_OFFLOAD;
65 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
67 memset(ip, 0, sizeof(struct br_ip));
69 ip->proto = entry->addr.proto;
70 if (ip->proto == htons(ETH_P_IP))
71 ip->u.ip4 = entry->addr.u.ip4;
72 #if IS_ENABLED(CONFIG_IPV6)
74 ip->u.ip6 = entry->addr.u.ip6;
78 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
79 struct net_device *dev)
81 struct net_bridge *br = netdev_priv(dev);
82 struct net_bridge_mdb_htable *mdb;
83 struct nlattr *nest, *nest2;
85 int idx = 0, s_idx = cb->args[1];
87 if (br->multicast_disabled)
90 mdb = rcu_dereference(br->mdb);
94 nest = nla_nest_start(skb, MDBA_MDB);
98 for (i = 0; i < mdb->max; i++) {
99 struct net_bridge_mdb_entry *mp;
100 struct net_bridge_port_group *p;
101 struct net_bridge_port_group __rcu **pp;
102 struct net_bridge_port *port;
104 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
108 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
114 for (pp = &mp->ports;
115 (p = rcu_dereference(*pp)) != NULL;
117 struct nlattr *nest_ent;
118 struct br_mdb_entry e;
124 memset(&e, 0, sizeof(e));
125 e.ifindex = port->dev->ifindex;
127 __mdb_entry_fill_flags(&e, p->flags);
128 if (p->addr.proto == htons(ETH_P_IP))
129 e.addr.u.ip4 = p->addr.u.ip4;
130 #if IS_ENABLED(CONFIG_IPV6)
131 if (p->addr.proto == htons(ETH_P_IPV6))
132 e.addr.u.ip6 = p->addr.u.ip6;
134 e.addr.proto = p->addr.proto;
135 nest_ent = nla_nest_start(skb,
136 MDBA_MDB_ENTRY_INFO);
138 nla_nest_cancel(skb, nest2);
142 if (nla_put_nohdr(skb, sizeof(e), &e) ||
144 MDBA_MDB_EATTR_TIMER,
145 br_timer_value(&p->timer))) {
146 nla_nest_cancel(skb, nest_ent);
147 nla_nest_cancel(skb, nest2);
151 nla_nest_end(skb, nest_ent);
153 nla_nest_end(skb, nest2);
161 nla_nest_end(skb, nest);
165 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
167 struct net_device *dev;
168 struct net *net = sock_net(skb->sk);
169 struct nlmsghdr *nlh = NULL;
176 /* In theory this could be wrapped to 0... */
177 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
179 for_each_netdev_rcu(net, dev) {
180 if (dev->priv_flags & IFF_EBRIDGE) {
181 struct br_port_msg *bpm;
186 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
187 cb->nlh->nlmsg_seq, RTM_GETMDB,
188 sizeof(*bpm), NLM_F_MULTI);
192 bpm = nlmsg_data(nlh);
193 memset(bpm, 0, sizeof(*bpm));
194 bpm->ifindex = dev->ifindex;
195 if (br_mdb_fill_info(skb, cb, dev) < 0)
197 if (br_rports_fill_info(skb, cb, dev) < 0)
215 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
216 struct net_device *dev,
217 struct br_mdb_entry *entry, u32 pid,
218 u32 seq, int type, unsigned int flags)
220 struct nlmsghdr *nlh;
221 struct br_port_msg *bpm;
222 struct nlattr *nest, *nest2;
224 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
228 bpm = nlmsg_data(nlh);
229 memset(bpm, 0, sizeof(*bpm));
230 bpm->family = AF_BRIDGE;
231 bpm->ifindex = dev->ifindex;
232 nest = nla_nest_start(skb, MDBA_MDB);
235 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
239 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
242 nla_nest_end(skb, nest2);
243 nla_nest_end(skb, nest);
248 nla_nest_end(skb, nest);
250 nlmsg_cancel(skb, nlh);
254 static inline size_t rtnl_mdb_nlmsg_size(void)
256 return NLMSG_ALIGN(sizeof(struct br_port_msg))
257 + nla_total_size(sizeof(struct br_mdb_entry));
260 struct br_mdb_complete_info {
261 struct net_bridge_port *port;
265 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
267 struct br_mdb_complete_info *data = priv;
268 struct net_bridge_port_group __rcu **pp;
269 struct net_bridge_port_group *p;
270 struct net_bridge_mdb_htable *mdb;
271 struct net_bridge_mdb_entry *mp;
272 struct net_bridge_port *port = data->port;
273 struct net_bridge *br = port->br;
278 spin_lock_bh(&br->multicast_lock);
279 mdb = mlock_dereference(br->mdb, br);
280 mp = br_mdb_ip_get(mdb, &data->ip);
283 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
287 p->flags |= MDB_PG_FLAGS_OFFLOAD;
290 spin_unlock_bh(&br->multicast_lock);
295 static void br_mdb_switchdev_host_port(struct net_device *dev,
296 struct net_device *lower_dev,
297 struct br_mdb_entry *entry, int type)
299 struct switchdev_obj_port_mdb mdb = {
301 .id = SWITCHDEV_OBJ_ID_HOST_MDB,
302 .flags = SWITCHDEV_F_DEFER,
307 if (entry->addr.proto == htons(ETH_P_IP))
308 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
309 #if IS_ENABLED(CONFIG_IPV6)
311 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
314 mdb.obj.orig_dev = dev;
317 switchdev_port_obj_add(lower_dev, &mdb.obj);
320 switchdev_port_obj_del(lower_dev, &mdb.obj);
325 static void br_mdb_switchdev_host(struct net_device *dev,
326 struct br_mdb_entry *entry, int type)
328 struct net_device *lower_dev;
329 struct list_head *iter;
331 netdev_for_each_lower_dev(dev, lower_dev, iter)
332 br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
335 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
336 struct br_mdb_entry *entry, int type)
338 struct br_mdb_complete_info *complete_info;
339 struct switchdev_obj_port_mdb mdb = {
341 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
342 .flags = SWITCHDEV_F_DEFER,
346 struct net_device *port_dev;
347 struct net *net = dev_net(dev);
351 port_dev = __dev_get_by_index(net, entry->ifindex);
352 if (entry->addr.proto == htons(ETH_P_IP))
353 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
354 #if IS_ENABLED(CONFIG_IPV6)
356 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
359 mdb.obj.orig_dev = port_dev;
360 if (p && port_dev && type == RTM_NEWMDB) {
361 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
363 complete_info->port = p;
364 __mdb_entry_to_br_ip(entry, &complete_info->ip);
365 mdb.obj.complete_priv = complete_info;
366 mdb.obj.complete = br_mdb_complete;
367 if (switchdev_port_obj_add(port_dev, &mdb.obj))
368 kfree(complete_info);
370 } else if (p && port_dev && type == RTM_DELMDB) {
371 switchdev_port_obj_del(port_dev, &mdb.obj);
375 br_mdb_switchdev_host(dev, entry, type);
377 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
381 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
387 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
390 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
393 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
394 struct br_ip *group, int type, u8 flags)
396 struct br_mdb_entry entry;
398 memset(&entry, 0, sizeof(entry));
400 entry.ifindex = port->dev->ifindex;
402 entry.ifindex = dev->ifindex;
403 entry.addr.proto = group->proto;
404 entry.addr.u.ip4 = group->u.ip4;
405 #if IS_ENABLED(CONFIG_IPV6)
406 entry.addr.u.ip6 = group->u.ip6;
408 entry.vid = group->vid;
409 __mdb_entry_fill_flags(&entry, flags);
410 __br_mdb_notify(dev, port, &entry, type);
413 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
414 struct net_device *dev,
415 int ifindex, u32 pid,
416 u32 seq, int type, unsigned int flags)
418 struct br_port_msg *bpm;
419 struct nlmsghdr *nlh;
422 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
426 bpm = nlmsg_data(nlh);
427 memset(bpm, 0, sizeof(*bpm));
428 bpm->family = AF_BRIDGE;
429 bpm->ifindex = dev->ifindex;
430 nest = nla_nest_start(skb, MDBA_ROUTER);
434 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
437 nla_nest_end(skb, nest);
442 nla_nest_end(skb, nest);
444 nlmsg_cancel(skb, nlh);
448 static inline size_t rtnl_rtr_nlmsg_size(void)
450 return NLMSG_ALIGN(sizeof(struct br_port_msg))
451 + nla_total_size(sizeof(__u32));
454 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
457 struct net *net = dev_net(dev);
462 ifindex = port ? port->dev->ifindex : 0;
463 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
467 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
473 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
477 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
480 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
482 if (entry->ifindex == 0)
485 if (entry->addr.proto == htons(ETH_P_IP)) {
486 if (!ipv4_is_multicast(entry->addr.u.ip4))
488 if (ipv4_is_local_multicast(entry->addr.u.ip4))
490 #if IS_ENABLED(CONFIG_IPV6)
491 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
492 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
497 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
499 if (entry->vid >= VLAN_VID_MASK)
505 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
506 struct net_device **pdev, struct br_mdb_entry **pentry)
508 struct net *net = sock_net(skb->sk);
509 struct br_mdb_entry *entry;
510 struct br_port_msg *bpm;
511 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
512 struct net_device *dev;
515 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
520 bpm = nlmsg_data(nlh);
521 if (bpm->ifindex == 0) {
522 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
526 dev = __dev_get_by_index(net, bpm->ifindex);
528 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
532 if (!(dev->priv_flags & IFF_EBRIDGE)) {
533 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
539 if (!tb[MDBA_SET_ENTRY] ||
540 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
541 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
545 entry = nla_data(tb[MDBA_SET_ENTRY]);
546 if (!is_valid_mdb_entry(entry)) {
547 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
555 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
556 struct br_ip *group, unsigned char state)
558 struct net_bridge_mdb_entry *mp;
559 struct net_bridge_port_group *p;
560 struct net_bridge_port_group __rcu **pp;
561 struct net_bridge_mdb_htable *mdb;
562 unsigned long now = jiffies;
565 mdb = mlock_dereference(br->mdb, br);
566 mp = br_mdb_ip_get(mdb, group);
568 mp = br_multicast_new_group(br, port, group);
569 err = PTR_ERR_OR_ZERO(mp);
574 for (pp = &mp->ports;
575 (p = mlock_dereference(*pp, br)) != NULL;
579 if ((unsigned long)p->port < (unsigned long)port)
583 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
586 rcu_assign_pointer(*pp, p);
587 if (state == MDB_TEMPORARY)
588 mod_timer(&p->timer, now + br->multicast_membership_interval);
593 static int __br_mdb_add(struct net *net, struct net_bridge *br,
594 struct br_mdb_entry *entry)
597 struct net_device *dev;
598 struct net_bridge_port *p;
601 if (!netif_running(br->dev) || br->multicast_disabled)
604 dev = __dev_get_by_index(net, entry->ifindex);
608 p = br_port_get_rtnl(dev);
609 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
612 __mdb_entry_to_br_ip(entry, &ip);
614 spin_lock_bh(&br->multicast_lock);
615 ret = br_mdb_add_group(br, p, &ip, entry->state);
616 spin_unlock_bh(&br->multicast_lock);
620 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
621 struct netlink_ext_ack *extack)
623 struct net *net = sock_net(skb->sk);
624 struct net_bridge_vlan_group *vg;
625 struct net_device *dev, *pdev;
626 struct br_mdb_entry *entry;
627 struct net_bridge_port *p;
628 struct net_bridge_vlan *v;
629 struct net_bridge *br;
632 err = br_mdb_parse(skb, nlh, &dev, &entry);
636 br = netdev_priv(dev);
638 /* If vlan filtering is enabled and VLAN is not specified
639 * install mdb entry on all vlans configured on the port.
641 pdev = __dev_get_by_index(net, entry->ifindex);
645 p = br_port_get_rtnl(pdev);
646 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
649 vg = nbp_vlan_group(p);
650 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
651 list_for_each_entry(v, &vg->vlan_list, vlist) {
653 err = __br_mdb_add(net, br, entry);
656 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
659 err = __br_mdb_add(net, br, entry);
661 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
667 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
669 struct net_bridge_mdb_htable *mdb;
670 struct net_bridge_mdb_entry *mp;
671 struct net_bridge_port_group *p;
672 struct net_bridge_port_group __rcu **pp;
676 if (!netif_running(br->dev) || br->multicast_disabled)
679 __mdb_entry_to_br_ip(entry, &ip);
681 spin_lock_bh(&br->multicast_lock);
682 mdb = mlock_dereference(br->mdb, br);
684 mp = br_mdb_ip_get(mdb, &ip);
688 for (pp = &mp->ports;
689 (p = mlock_dereference(*pp, br)) != NULL;
691 if (!p->port || p->port->dev->ifindex != entry->ifindex)
694 if (p->port->state == BR_STATE_DISABLED)
697 __mdb_entry_fill_flags(entry, p->flags);
698 rcu_assign_pointer(*pp, p->next);
699 hlist_del_init(&p->mglist);
700 del_timer(&p->timer);
701 call_rcu_bh(&p->rcu, br_multicast_free_pg);
704 if (!mp->ports && !mp->host_joined &&
705 netif_running(br->dev))
706 mod_timer(&mp->timer, jiffies);
711 spin_unlock_bh(&br->multicast_lock);
715 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
716 struct netlink_ext_ack *extack)
718 struct net *net = sock_net(skb->sk);
719 struct net_bridge_vlan_group *vg;
720 struct net_device *dev, *pdev;
721 struct br_mdb_entry *entry;
722 struct net_bridge_port *p;
723 struct net_bridge_vlan *v;
724 struct net_bridge *br;
727 err = br_mdb_parse(skb, nlh, &dev, &entry);
731 br = netdev_priv(dev);
733 /* If vlan filtering is enabled and VLAN is not specified
734 * delete mdb entry on all vlans configured on the port.
736 pdev = __dev_get_by_index(net, entry->ifindex);
740 p = br_port_get_rtnl(pdev);
741 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
744 vg = nbp_vlan_group(p);
745 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
746 list_for_each_entry(v, &vg->vlan_list, vlist) {
748 err = __br_mdb_del(br, entry);
750 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
753 err = __br_mdb_del(br, entry);
755 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
761 void br_mdb_init(void)
763 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
764 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
765 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
768 void br_mdb_uninit(void)
770 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
771 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
772 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);