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_opt_get(br, BROPT_MULTICAST_ENABLED))
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_valid_dump_req(const struct nlmsghdr *nlh,
166 struct netlink_ext_ack *extack)
168 struct br_port_msg *bpm;
170 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
171 NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
175 bpm = nlmsg_data(nlh);
177 NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
180 if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
181 NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
188 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
190 struct net_device *dev;
191 struct net *net = sock_net(skb->sk);
192 struct nlmsghdr *nlh = NULL;
195 if (cb->strict_check) {
196 int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
206 /* In theory this could be wrapped to 0... */
207 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
209 for_each_netdev_rcu(net, dev) {
210 if (dev->priv_flags & IFF_EBRIDGE) {
211 struct br_port_msg *bpm;
216 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
217 cb->nlh->nlmsg_seq, RTM_GETMDB,
218 sizeof(*bpm), NLM_F_MULTI);
222 bpm = nlmsg_data(nlh);
223 memset(bpm, 0, sizeof(*bpm));
224 bpm->ifindex = dev->ifindex;
225 if (br_mdb_fill_info(skb, cb, dev) < 0)
227 if (br_rports_fill_info(skb, cb, dev) < 0)
245 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
246 struct net_device *dev,
247 struct br_mdb_entry *entry, u32 pid,
248 u32 seq, int type, unsigned int flags)
250 struct nlmsghdr *nlh;
251 struct br_port_msg *bpm;
252 struct nlattr *nest, *nest2;
254 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
258 bpm = nlmsg_data(nlh);
259 memset(bpm, 0, sizeof(*bpm));
260 bpm->family = AF_BRIDGE;
261 bpm->ifindex = dev->ifindex;
262 nest = nla_nest_start(skb, MDBA_MDB);
265 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
269 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
272 nla_nest_end(skb, nest2);
273 nla_nest_end(skb, nest);
278 nla_nest_end(skb, nest);
280 nlmsg_cancel(skb, nlh);
284 static inline size_t rtnl_mdb_nlmsg_size(void)
286 return NLMSG_ALIGN(sizeof(struct br_port_msg))
287 + nla_total_size(sizeof(struct br_mdb_entry));
290 struct br_mdb_complete_info {
291 struct net_bridge_port *port;
295 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
297 struct br_mdb_complete_info *data = priv;
298 struct net_bridge_port_group __rcu **pp;
299 struct net_bridge_port_group *p;
300 struct net_bridge_mdb_htable *mdb;
301 struct net_bridge_mdb_entry *mp;
302 struct net_bridge_port *port = data->port;
303 struct net_bridge *br = port->br;
308 spin_lock_bh(&br->multicast_lock);
309 mdb = mlock_dereference(br->mdb, br);
310 mp = br_mdb_ip_get(mdb, &data->ip);
313 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
317 p->flags |= MDB_PG_FLAGS_OFFLOAD;
320 spin_unlock_bh(&br->multicast_lock);
325 static void br_mdb_switchdev_host_port(struct net_device *dev,
326 struct net_device *lower_dev,
327 struct br_mdb_entry *entry, int type)
329 struct switchdev_obj_port_mdb mdb = {
331 .id = SWITCHDEV_OBJ_ID_HOST_MDB,
332 .flags = SWITCHDEV_F_DEFER,
337 if (entry->addr.proto == htons(ETH_P_IP))
338 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
339 #if IS_ENABLED(CONFIG_IPV6)
341 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
344 mdb.obj.orig_dev = dev;
347 switchdev_port_obj_add(lower_dev, &mdb.obj);
350 switchdev_port_obj_del(lower_dev, &mdb.obj);
355 static void br_mdb_switchdev_host(struct net_device *dev,
356 struct br_mdb_entry *entry, int type)
358 struct net_device *lower_dev;
359 struct list_head *iter;
361 netdev_for_each_lower_dev(dev, lower_dev, iter)
362 br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
365 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
366 struct br_mdb_entry *entry, int type)
368 struct br_mdb_complete_info *complete_info;
369 struct switchdev_obj_port_mdb mdb = {
371 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
372 .flags = SWITCHDEV_F_DEFER,
376 struct net_device *port_dev;
377 struct net *net = dev_net(dev);
381 port_dev = __dev_get_by_index(net, entry->ifindex);
382 if (entry->addr.proto == htons(ETH_P_IP))
383 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
384 #if IS_ENABLED(CONFIG_IPV6)
386 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
389 mdb.obj.orig_dev = port_dev;
390 if (p && port_dev && type == RTM_NEWMDB) {
391 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
393 complete_info->port = p;
394 __mdb_entry_to_br_ip(entry, &complete_info->ip);
395 mdb.obj.complete_priv = complete_info;
396 mdb.obj.complete = br_mdb_complete;
397 if (switchdev_port_obj_add(port_dev, &mdb.obj))
398 kfree(complete_info);
400 } else if (p && port_dev && type == RTM_DELMDB) {
401 switchdev_port_obj_del(port_dev, &mdb.obj);
405 br_mdb_switchdev_host(dev, entry, type);
407 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
411 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
417 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
420 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
423 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
424 struct br_ip *group, int type, u8 flags)
426 struct br_mdb_entry entry;
428 memset(&entry, 0, sizeof(entry));
430 entry.ifindex = port->dev->ifindex;
432 entry.ifindex = dev->ifindex;
433 entry.addr.proto = group->proto;
434 entry.addr.u.ip4 = group->u.ip4;
435 #if IS_ENABLED(CONFIG_IPV6)
436 entry.addr.u.ip6 = group->u.ip6;
438 entry.vid = group->vid;
439 __mdb_entry_fill_flags(&entry, flags);
440 __br_mdb_notify(dev, port, &entry, type);
443 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
444 struct net_device *dev,
445 int ifindex, u32 pid,
446 u32 seq, int type, unsigned int flags)
448 struct br_port_msg *bpm;
449 struct nlmsghdr *nlh;
452 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
456 bpm = nlmsg_data(nlh);
457 memset(bpm, 0, sizeof(*bpm));
458 bpm->family = AF_BRIDGE;
459 bpm->ifindex = dev->ifindex;
460 nest = nla_nest_start(skb, MDBA_ROUTER);
464 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
467 nla_nest_end(skb, nest);
472 nla_nest_end(skb, nest);
474 nlmsg_cancel(skb, nlh);
478 static inline size_t rtnl_rtr_nlmsg_size(void)
480 return NLMSG_ALIGN(sizeof(struct br_port_msg))
481 + nla_total_size(sizeof(__u32));
484 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
487 struct net *net = dev_net(dev);
492 ifindex = port ? port->dev->ifindex : 0;
493 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
497 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
503 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
507 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
510 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
512 if (entry->ifindex == 0)
515 if (entry->addr.proto == htons(ETH_P_IP)) {
516 if (!ipv4_is_multicast(entry->addr.u.ip4))
518 if (ipv4_is_local_multicast(entry->addr.u.ip4))
520 #if IS_ENABLED(CONFIG_IPV6)
521 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
522 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
527 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
529 if (entry->vid >= VLAN_VID_MASK)
535 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
536 struct net_device **pdev, struct br_mdb_entry **pentry)
538 struct net *net = sock_net(skb->sk);
539 struct br_mdb_entry *entry;
540 struct br_port_msg *bpm;
541 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
542 struct net_device *dev;
545 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
550 bpm = nlmsg_data(nlh);
551 if (bpm->ifindex == 0) {
552 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
556 dev = __dev_get_by_index(net, bpm->ifindex);
558 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
562 if (!(dev->priv_flags & IFF_EBRIDGE)) {
563 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
569 if (!tb[MDBA_SET_ENTRY] ||
570 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
571 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
575 entry = nla_data(tb[MDBA_SET_ENTRY]);
576 if (!is_valid_mdb_entry(entry)) {
577 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
585 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
586 struct br_ip *group, unsigned char state)
588 struct net_bridge_mdb_entry *mp;
589 struct net_bridge_port_group *p;
590 struct net_bridge_port_group __rcu **pp;
591 struct net_bridge_mdb_htable *mdb;
592 unsigned long now = jiffies;
595 mdb = mlock_dereference(br->mdb, br);
596 mp = br_mdb_ip_get(mdb, group);
598 mp = br_multicast_new_group(br, port, group);
599 err = PTR_ERR_OR_ZERO(mp);
604 for (pp = &mp->ports;
605 (p = mlock_dereference(*pp, br)) != NULL;
609 if ((unsigned long)p->port < (unsigned long)port)
613 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
616 rcu_assign_pointer(*pp, p);
617 if (state == MDB_TEMPORARY)
618 mod_timer(&p->timer, now + br->multicast_membership_interval);
623 static int __br_mdb_add(struct net *net, struct net_bridge *br,
624 struct br_mdb_entry *entry)
627 struct net_device *dev;
628 struct net_bridge_port *p;
631 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
634 dev = __dev_get_by_index(net, entry->ifindex);
638 p = br_port_get_rtnl(dev);
639 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
642 __mdb_entry_to_br_ip(entry, &ip);
644 spin_lock_bh(&br->multicast_lock);
645 ret = br_mdb_add_group(br, p, &ip, entry->state);
646 spin_unlock_bh(&br->multicast_lock);
650 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
651 struct netlink_ext_ack *extack)
653 struct net *net = sock_net(skb->sk);
654 struct net_bridge_vlan_group *vg;
655 struct net_device *dev, *pdev;
656 struct br_mdb_entry *entry;
657 struct net_bridge_port *p;
658 struct net_bridge_vlan *v;
659 struct net_bridge *br;
662 err = br_mdb_parse(skb, nlh, &dev, &entry);
666 br = netdev_priv(dev);
668 /* If vlan filtering is enabled and VLAN is not specified
669 * install mdb entry on all vlans configured on the port.
671 pdev = __dev_get_by_index(net, entry->ifindex);
675 p = br_port_get_rtnl(pdev);
676 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
679 vg = nbp_vlan_group(p);
680 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
681 list_for_each_entry(v, &vg->vlan_list, vlist) {
683 err = __br_mdb_add(net, br, entry);
686 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
689 err = __br_mdb_add(net, br, entry);
691 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
697 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
699 struct net_bridge_mdb_htable *mdb;
700 struct net_bridge_mdb_entry *mp;
701 struct net_bridge_port_group *p;
702 struct net_bridge_port_group __rcu **pp;
706 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
709 __mdb_entry_to_br_ip(entry, &ip);
711 spin_lock_bh(&br->multicast_lock);
712 mdb = mlock_dereference(br->mdb, br);
714 mp = br_mdb_ip_get(mdb, &ip);
718 for (pp = &mp->ports;
719 (p = mlock_dereference(*pp, br)) != NULL;
721 if (!p->port || p->port->dev->ifindex != entry->ifindex)
724 if (p->port->state == BR_STATE_DISABLED)
727 __mdb_entry_fill_flags(entry, p->flags);
728 rcu_assign_pointer(*pp, p->next);
729 hlist_del_init(&p->mglist);
730 del_timer(&p->timer);
731 call_rcu_bh(&p->rcu, br_multicast_free_pg);
734 if (!mp->ports && !mp->host_joined &&
735 netif_running(br->dev))
736 mod_timer(&mp->timer, jiffies);
741 spin_unlock_bh(&br->multicast_lock);
745 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
746 struct netlink_ext_ack *extack)
748 struct net *net = sock_net(skb->sk);
749 struct net_bridge_vlan_group *vg;
750 struct net_device *dev, *pdev;
751 struct br_mdb_entry *entry;
752 struct net_bridge_port *p;
753 struct net_bridge_vlan *v;
754 struct net_bridge *br;
757 err = br_mdb_parse(skb, nlh, &dev, &entry);
761 br = netdev_priv(dev);
763 /* If vlan filtering is enabled and VLAN is not specified
764 * delete mdb entry on all vlans configured on the port.
766 pdev = __dev_get_by_index(net, entry->ifindex);
770 p = br_port_get_rtnl(pdev);
771 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
774 vg = nbp_vlan_group(p);
775 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
776 list_for_each_entry(v, &vg->vlan_list, vlist) {
778 err = __br_mdb_del(br, entry);
780 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
783 err = __br_mdb_del(br, entry);
785 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
791 void br_mdb_init(void)
793 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
794 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
795 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
798 void br_mdb_uninit(void)
800 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
801 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
802 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);