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_noflag(skb, MDBA_ROUTER);
33 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
36 port_nest = nla_nest_start_noflag(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;
63 if (flags & MDB_PG_FLAGS_FAST_LEAVE)
64 e->flags |= MDB_FLAGS_FAST_LEAVE;
67 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip)
69 memset(ip, 0, sizeof(struct br_ip));
71 ip->proto = entry->addr.proto;
72 if (ip->proto == htons(ETH_P_IP))
73 ip->u.ip4 = entry->addr.u.ip4;
74 #if IS_ENABLED(CONFIG_IPV6)
76 ip->u.ip6 = entry->addr.u.ip6;
80 static int __mdb_fill_info(struct sk_buff *skb,
81 struct net_bridge_mdb_entry *mp,
82 struct net_bridge_port_group *p)
84 struct timer_list *mtimer;
85 struct nlattr *nest_ent;
86 struct br_mdb_entry e;
90 memset(&e, 0, sizeof(e));
92 ifindex = p->port->dev->ifindex;
96 ifindex = mp->br->dev->ifindex;
100 __mdb_entry_fill_flags(&e, flags);
102 e.vid = mp->addr.vid;
103 if (mp->addr.proto == htons(ETH_P_IP))
104 e.addr.u.ip4 = mp->addr.u.ip4;
105 #if IS_ENABLED(CONFIG_IPV6)
106 if (mp->addr.proto == htons(ETH_P_IPV6))
107 e.addr.u.ip6 = mp->addr.u.ip6;
109 e.addr.proto = mp->addr.proto;
110 nest_ent = nla_nest_start_noflag(skb,
111 MDBA_MDB_ENTRY_INFO);
115 if (nla_put_nohdr(skb, sizeof(e), &e) ||
117 MDBA_MDB_EATTR_TIMER,
118 br_timer_value(mtimer))) {
119 nla_nest_cancel(skb, nest_ent);
122 nla_nest_end(skb, nest_ent);
127 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
128 struct net_device *dev)
130 int idx = 0, s_idx = cb->args[1], err = 0;
131 struct net_bridge *br = netdev_priv(dev);
132 struct net_bridge_mdb_entry *mp;
133 struct nlattr *nest, *nest2;
135 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
138 nest = nla_nest_start_noflag(skb, MDBA_MDB);
142 hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
143 struct net_bridge_port_group *p;
144 struct net_bridge_port_group __rcu **pp;
149 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
155 if (mp->host_joined) {
156 err = __mdb_fill_info(skb, mp, NULL);
158 nla_nest_cancel(skb, nest2);
163 for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
168 err = __mdb_fill_info(skb, mp, p);
170 nla_nest_cancel(skb, nest2);
174 nla_nest_end(skb, nest2);
181 nla_nest_end(skb, nest);
185 static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh,
186 struct netlink_ext_ack *extack)
188 struct br_port_msg *bpm;
190 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
191 NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
195 bpm = nlmsg_data(nlh);
197 NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
200 if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
201 NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
208 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
210 struct net_device *dev;
211 struct net *net = sock_net(skb->sk);
212 struct nlmsghdr *nlh = NULL;
215 if (cb->strict_check) {
216 int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
226 cb->seq = net->dev_base_seq;
228 for_each_netdev_rcu(net, dev) {
229 if (dev->priv_flags & IFF_EBRIDGE) {
230 struct br_port_msg *bpm;
235 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
236 cb->nlh->nlmsg_seq, RTM_GETMDB,
237 sizeof(*bpm), NLM_F_MULTI);
241 bpm = nlmsg_data(nlh);
242 memset(bpm, 0, sizeof(*bpm));
243 bpm->ifindex = dev->ifindex;
244 if (br_mdb_fill_info(skb, cb, dev) < 0)
246 if (br_rports_fill_info(skb, cb, dev) < 0)
264 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
265 struct net_device *dev,
266 struct br_mdb_entry *entry, u32 pid,
267 u32 seq, int type, unsigned int flags)
269 struct nlmsghdr *nlh;
270 struct br_port_msg *bpm;
271 struct nlattr *nest, *nest2;
273 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
277 bpm = nlmsg_data(nlh);
278 memset(bpm, 0, sizeof(*bpm));
279 bpm->family = AF_BRIDGE;
280 bpm->ifindex = dev->ifindex;
281 nest = nla_nest_start_noflag(skb, MDBA_MDB);
284 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
288 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
291 nla_nest_end(skb, nest2);
292 nla_nest_end(skb, nest);
297 nla_nest_end(skb, nest);
299 nlmsg_cancel(skb, nlh);
303 static inline size_t rtnl_mdb_nlmsg_size(void)
305 return NLMSG_ALIGN(sizeof(struct br_port_msg))
306 + nla_total_size(sizeof(struct br_mdb_entry));
309 struct br_mdb_complete_info {
310 struct net_bridge_port *port;
314 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
316 struct br_mdb_complete_info *data = priv;
317 struct net_bridge_port_group __rcu **pp;
318 struct net_bridge_port_group *p;
319 struct net_bridge_mdb_entry *mp;
320 struct net_bridge_port *port = data->port;
321 struct net_bridge *br = port->br;
326 spin_lock_bh(&br->multicast_lock);
327 mp = br_mdb_ip_get(br, &data->ip);
330 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
334 p->flags |= MDB_PG_FLAGS_OFFLOAD;
337 spin_unlock_bh(&br->multicast_lock);
342 static void br_mdb_switchdev_host_port(struct net_device *dev,
343 struct net_device *lower_dev,
344 struct br_mdb_entry *entry, int type)
346 struct switchdev_obj_port_mdb mdb = {
348 .id = SWITCHDEV_OBJ_ID_HOST_MDB,
349 .flags = SWITCHDEV_F_DEFER,
354 if (entry->addr.proto == htons(ETH_P_IP))
355 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
356 #if IS_ENABLED(CONFIG_IPV6)
358 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
361 mdb.obj.orig_dev = dev;
364 switchdev_port_obj_add(lower_dev, &mdb.obj, NULL);
367 switchdev_port_obj_del(lower_dev, &mdb.obj);
372 static void br_mdb_switchdev_host(struct net_device *dev,
373 struct br_mdb_entry *entry, int type)
375 struct net_device *lower_dev;
376 struct list_head *iter;
378 netdev_for_each_lower_dev(dev, lower_dev, iter)
379 br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
382 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
383 struct br_mdb_entry *entry, int type)
385 struct br_mdb_complete_info *complete_info;
386 struct switchdev_obj_port_mdb mdb = {
388 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
389 .flags = SWITCHDEV_F_DEFER,
393 struct net_device *port_dev;
394 struct net *net = dev_net(dev);
398 port_dev = __dev_get_by_index(net, entry->ifindex);
399 if (entry->addr.proto == htons(ETH_P_IP))
400 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
401 #if IS_ENABLED(CONFIG_IPV6)
403 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
406 mdb.obj.orig_dev = port_dev;
407 if (p && port_dev && type == RTM_NEWMDB) {
408 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
410 complete_info->port = p;
411 __mdb_entry_to_br_ip(entry, &complete_info->ip);
412 mdb.obj.complete_priv = complete_info;
413 mdb.obj.complete = br_mdb_complete;
414 if (switchdev_port_obj_add(port_dev, &mdb.obj, NULL))
415 kfree(complete_info);
417 } else if (p && port_dev && type == RTM_DELMDB) {
418 switchdev_port_obj_del(port_dev, &mdb.obj);
422 br_mdb_switchdev_host(dev, entry, type);
424 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
428 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
434 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
437 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
440 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
441 struct br_ip *group, int type, u8 flags)
443 struct br_mdb_entry entry;
445 memset(&entry, 0, sizeof(entry));
447 entry.ifindex = port->dev->ifindex;
449 entry.ifindex = dev->ifindex;
450 entry.addr.proto = group->proto;
451 entry.addr.u.ip4 = group->u.ip4;
452 #if IS_ENABLED(CONFIG_IPV6)
453 entry.addr.u.ip6 = group->u.ip6;
455 entry.vid = group->vid;
456 __mdb_entry_fill_flags(&entry, flags);
457 __br_mdb_notify(dev, port, &entry, type);
460 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
461 struct net_device *dev,
462 int ifindex, u32 pid,
463 u32 seq, int type, unsigned int flags)
465 struct br_port_msg *bpm;
466 struct nlmsghdr *nlh;
469 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
473 bpm = nlmsg_data(nlh);
474 memset(bpm, 0, sizeof(*bpm));
475 bpm->family = AF_BRIDGE;
476 bpm->ifindex = dev->ifindex;
477 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
481 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
484 nla_nest_end(skb, nest);
489 nla_nest_end(skb, nest);
491 nlmsg_cancel(skb, nlh);
495 static inline size_t rtnl_rtr_nlmsg_size(void)
497 return NLMSG_ALIGN(sizeof(struct br_port_msg))
498 + nla_total_size(sizeof(__u32));
501 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
504 struct net *net = dev_net(dev);
509 ifindex = port ? port->dev->ifindex : 0;
510 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
514 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
520 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
524 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
527 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
529 if (entry->ifindex == 0)
532 if (entry->addr.proto == htons(ETH_P_IP)) {
533 if (!ipv4_is_multicast(entry->addr.u.ip4))
535 if (ipv4_is_local_multicast(entry->addr.u.ip4))
537 #if IS_ENABLED(CONFIG_IPV6)
538 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
539 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
544 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
546 if (entry->vid >= VLAN_VID_MASK)
552 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
553 struct net_device **pdev, struct br_mdb_entry **pentry)
555 struct net *net = sock_net(skb->sk);
556 struct br_mdb_entry *entry;
557 struct br_port_msg *bpm;
558 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
559 struct net_device *dev;
562 err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
563 MDBA_SET_ENTRY_MAX, NULL, NULL);
567 bpm = nlmsg_data(nlh);
568 if (bpm->ifindex == 0) {
569 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
573 dev = __dev_get_by_index(net, bpm->ifindex);
575 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
579 if (!(dev->priv_flags & IFF_EBRIDGE)) {
580 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
586 if (!tb[MDBA_SET_ENTRY] ||
587 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
588 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
592 entry = nla_data(tb[MDBA_SET_ENTRY]);
593 if (!is_valid_mdb_entry(entry)) {
594 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
602 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
603 struct br_ip *group, unsigned char state)
605 struct net_bridge_mdb_entry *mp;
606 struct net_bridge_port_group *p;
607 struct net_bridge_port_group __rcu **pp;
608 unsigned long now = jiffies;
611 mp = br_mdb_ip_get(br, group);
613 mp = br_multicast_new_group(br, group);
614 err = PTR_ERR_OR_ZERO(mp);
621 /* don't allow any flags for host-joined groups */
627 br_multicast_host_join(mp, false);
632 for (pp = &mp->ports;
633 (p = mlock_dereference(*pp, br)) != NULL;
637 if ((unsigned long)p->port < (unsigned long)port)
641 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
644 rcu_assign_pointer(*pp, p);
645 if (state == MDB_TEMPORARY)
646 mod_timer(&p->timer, now + br->multicast_membership_interval);
651 static int __br_mdb_add(struct net *net, struct net_bridge *br,
652 struct br_mdb_entry *entry)
655 struct net_device *dev;
656 struct net_bridge_port *p = NULL;
659 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
662 if (entry->ifindex != br->dev->ifindex) {
663 dev = __dev_get_by_index(net, entry->ifindex);
667 p = br_port_get_rtnl(dev);
668 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
672 __mdb_entry_to_br_ip(entry, &ip);
674 spin_lock_bh(&br->multicast_lock);
675 ret = br_mdb_add_group(br, p, &ip, entry->state);
676 spin_unlock_bh(&br->multicast_lock);
680 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
681 struct netlink_ext_ack *extack)
683 struct net *net = sock_net(skb->sk);
684 struct net_bridge_vlan_group *vg;
685 struct net_bridge_port *p = NULL;
686 struct net_device *dev, *pdev;
687 struct br_mdb_entry *entry;
688 struct net_bridge_vlan *v;
689 struct net_bridge *br;
692 err = br_mdb_parse(skb, nlh, &dev, &entry);
696 br = netdev_priv(dev);
698 if (entry->ifindex != br->dev->ifindex) {
699 pdev = __dev_get_by_index(net, entry->ifindex);
703 p = br_port_get_rtnl(pdev);
704 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
706 vg = nbp_vlan_group(p);
708 vg = br_vlan_group(br);
711 /* If vlan filtering is enabled and VLAN is not specified
712 * install mdb entry on all vlans configured on the port.
714 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
715 list_for_each_entry(v, &vg->vlan_list, vlist) {
717 err = __br_mdb_add(net, br, entry);
720 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
723 err = __br_mdb_add(net, br, entry);
725 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
731 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
733 struct net_bridge_mdb_entry *mp;
734 struct net_bridge_port_group *p;
735 struct net_bridge_port_group __rcu **pp;
739 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
742 __mdb_entry_to_br_ip(entry, &ip);
744 spin_lock_bh(&br->multicast_lock);
745 mp = br_mdb_ip_get(br, &ip);
750 if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) {
751 br_multicast_host_leave(mp, false);
753 if (!mp->ports && netif_running(br->dev))
754 mod_timer(&mp->timer, jiffies);
758 for (pp = &mp->ports;
759 (p = mlock_dereference(*pp, br)) != NULL;
761 if (!p->port || p->port->dev->ifindex != entry->ifindex)
764 if (p->port->state == BR_STATE_DISABLED)
767 __mdb_entry_fill_flags(entry, p->flags);
768 rcu_assign_pointer(*pp, p->next);
769 hlist_del_init(&p->mglist);
770 del_timer(&p->timer);
774 if (!mp->ports && !mp->host_joined &&
775 netif_running(br->dev))
776 mod_timer(&mp->timer, jiffies);
781 spin_unlock_bh(&br->multicast_lock);
785 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
786 struct netlink_ext_ack *extack)
788 struct net *net = sock_net(skb->sk);
789 struct net_bridge_vlan_group *vg;
790 struct net_bridge_port *p = NULL;
791 struct net_device *dev, *pdev;
792 struct br_mdb_entry *entry;
793 struct net_bridge_vlan *v;
794 struct net_bridge *br;
797 err = br_mdb_parse(skb, nlh, &dev, &entry);
801 br = netdev_priv(dev);
803 if (entry->ifindex != br->dev->ifindex) {
804 pdev = __dev_get_by_index(net, entry->ifindex);
808 p = br_port_get_rtnl(pdev);
809 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
811 vg = nbp_vlan_group(p);
813 vg = br_vlan_group(br);
816 /* If vlan filtering is enabled and VLAN is not specified
817 * delete mdb entry on all vlans configured on the port.
819 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
820 list_for_each_entry(v, &vg->vlan_list, vlist) {
822 err = __br_mdb_del(br, entry);
824 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
827 err = __br_mdb_del(br, entry);
829 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
835 void br_mdb_init(void)
837 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
838 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
839 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
842 void br_mdb_uninit(void)
844 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
845 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
846 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);