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;
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 int idx = 0, s_idx = cb->args[1], err = 0;
82 struct net_bridge *br = netdev_priv(dev);
83 struct net_bridge_mdb_entry *mp;
84 struct nlattr *nest, *nest2;
86 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
89 nest = nla_nest_start_noflag(skb, MDBA_MDB);
93 hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
94 struct net_bridge_port_group *p;
95 struct net_bridge_port_group __rcu **pp;
96 struct net_bridge_port *port;
101 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
107 for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
109 struct nlattr *nest_ent;
110 struct br_mdb_entry e;
116 memset(&e, 0, sizeof(e));
117 e.ifindex = port->dev->ifindex;
119 __mdb_entry_fill_flags(&e, p->flags);
120 if (p->addr.proto == htons(ETH_P_IP))
121 e.addr.u.ip4 = p->addr.u.ip4;
122 #if IS_ENABLED(CONFIG_IPV6)
123 if (p->addr.proto == htons(ETH_P_IPV6))
124 e.addr.u.ip6 = p->addr.u.ip6;
126 e.addr.proto = p->addr.proto;
127 nest_ent = nla_nest_start_noflag(skb,
128 MDBA_MDB_ENTRY_INFO);
130 nla_nest_cancel(skb, nest2);
134 if (nla_put_nohdr(skb, sizeof(e), &e) ||
136 MDBA_MDB_EATTR_TIMER,
137 br_timer_value(&p->timer))) {
138 nla_nest_cancel(skb, nest_ent);
139 nla_nest_cancel(skb, nest2);
143 nla_nest_end(skb, nest_ent);
145 nla_nest_end(skb, nest2);
152 nla_nest_end(skb, nest);
156 static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh,
157 struct netlink_ext_ack *extack)
159 struct br_port_msg *bpm;
161 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
162 NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
166 bpm = nlmsg_data(nlh);
168 NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
171 if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
172 NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
179 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
181 struct net_device *dev;
182 struct net *net = sock_net(skb->sk);
183 struct nlmsghdr *nlh = NULL;
186 if (cb->strict_check) {
187 int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
197 cb->seq = net->dev_base_seq;
199 for_each_netdev_rcu(net, dev) {
200 if (dev->priv_flags & IFF_EBRIDGE) {
201 struct br_port_msg *bpm;
206 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
207 cb->nlh->nlmsg_seq, RTM_GETMDB,
208 sizeof(*bpm), NLM_F_MULTI);
212 bpm = nlmsg_data(nlh);
213 memset(bpm, 0, sizeof(*bpm));
214 bpm->ifindex = dev->ifindex;
215 if (br_mdb_fill_info(skb, cb, dev) < 0)
217 if (br_rports_fill_info(skb, cb, dev) < 0)
235 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
236 struct net_device *dev,
237 struct br_mdb_entry *entry, u32 pid,
238 u32 seq, int type, unsigned int flags)
240 struct nlmsghdr *nlh;
241 struct br_port_msg *bpm;
242 struct nlattr *nest, *nest2;
244 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
248 bpm = nlmsg_data(nlh);
249 memset(bpm, 0, sizeof(*bpm));
250 bpm->family = AF_BRIDGE;
251 bpm->ifindex = dev->ifindex;
252 nest = nla_nest_start_noflag(skb, MDBA_MDB);
255 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
259 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
262 nla_nest_end(skb, nest2);
263 nla_nest_end(skb, nest);
268 nla_nest_end(skb, nest);
270 nlmsg_cancel(skb, nlh);
274 static inline size_t rtnl_mdb_nlmsg_size(void)
276 return NLMSG_ALIGN(sizeof(struct br_port_msg))
277 + nla_total_size(sizeof(struct br_mdb_entry));
280 struct br_mdb_complete_info {
281 struct net_bridge_port *port;
285 static void br_mdb_complete(struct net_device *dev, int err, void *priv)
287 struct br_mdb_complete_info *data = priv;
288 struct net_bridge_port_group __rcu **pp;
289 struct net_bridge_port_group *p;
290 struct net_bridge_mdb_entry *mp;
291 struct net_bridge_port *port = data->port;
292 struct net_bridge *br = port->br;
297 spin_lock_bh(&br->multicast_lock);
298 mp = br_mdb_ip_get(br, &data->ip);
301 for (pp = &mp->ports; (p = mlock_dereference(*pp, br)) != NULL;
305 p->flags |= MDB_PG_FLAGS_OFFLOAD;
308 spin_unlock_bh(&br->multicast_lock);
313 static void br_mdb_switchdev_host_port(struct net_device *dev,
314 struct net_device *lower_dev,
315 struct br_mdb_entry *entry, int type)
317 struct switchdev_obj_port_mdb mdb = {
319 .id = SWITCHDEV_OBJ_ID_HOST_MDB,
320 .flags = SWITCHDEV_F_DEFER,
325 if (entry->addr.proto == htons(ETH_P_IP))
326 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
327 #if IS_ENABLED(CONFIG_IPV6)
329 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
332 mdb.obj.orig_dev = dev;
335 switchdev_port_obj_add(lower_dev, &mdb.obj, NULL);
338 switchdev_port_obj_del(lower_dev, &mdb.obj);
343 static void br_mdb_switchdev_host(struct net_device *dev,
344 struct br_mdb_entry *entry, int type)
346 struct net_device *lower_dev;
347 struct list_head *iter;
349 netdev_for_each_lower_dev(dev, lower_dev, iter)
350 br_mdb_switchdev_host_port(dev, lower_dev, entry, type);
353 static void __br_mdb_notify(struct net_device *dev, struct net_bridge_port *p,
354 struct br_mdb_entry *entry, int type)
356 struct br_mdb_complete_info *complete_info;
357 struct switchdev_obj_port_mdb mdb = {
359 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
360 .flags = SWITCHDEV_F_DEFER,
364 struct net_device *port_dev;
365 struct net *net = dev_net(dev);
369 port_dev = __dev_get_by_index(net, entry->ifindex);
370 if (entry->addr.proto == htons(ETH_P_IP))
371 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
372 #if IS_ENABLED(CONFIG_IPV6)
374 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
377 mdb.obj.orig_dev = port_dev;
378 if (p && port_dev && type == RTM_NEWMDB) {
379 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
381 complete_info->port = p;
382 __mdb_entry_to_br_ip(entry, &complete_info->ip);
383 mdb.obj.complete_priv = complete_info;
384 mdb.obj.complete = br_mdb_complete;
385 if (switchdev_port_obj_add(port_dev, &mdb.obj, NULL))
386 kfree(complete_info);
388 } else if (p && port_dev && type == RTM_DELMDB) {
389 switchdev_port_obj_del(port_dev, &mdb.obj);
393 br_mdb_switchdev_host(dev, entry, type);
395 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
399 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
405 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
408 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
411 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
412 struct br_ip *group, int type, u8 flags)
414 struct br_mdb_entry entry;
416 memset(&entry, 0, sizeof(entry));
418 entry.ifindex = port->dev->ifindex;
420 entry.ifindex = dev->ifindex;
421 entry.addr.proto = group->proto;
422 entry.addr.u.ip4 = group->u.ip4;
423 #if IS_ENABLED(CONFIG_IPV6)
424 entry.addr.u.ip6 = group->u.ip6;
426 entry.vid = group->vid;
427 __mdb_entry_fill_flags(&entry, flags);
428 __br_mdb_notify(dev, port, &entry, type);
431 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
432 struct net_device *dev,
433 int ifindex, u32 pid,
434 u32 seq, int type, unsigned int flags)
436 struct br_port_msg *bpm;
437 struct nlmsghdr *nlh;
440 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
444 bpm = nlmsg_data(nlh);
445 memset(bpm, 0, sizeof(*bpm));
446 bpm->family = AF_BRIDGE;
447 bpm->ifindex = dev->ifindex;
448 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
452 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
455 nla_nest_end(skb, nest);
460 nla_nest_end(skb, nest);
462 nlmsg_cancel(skb, nlh);
466 static inline size_t rtnl_rtr_nlmsg_size(void)
468 return NLMSG_ALIGN(sizeof(struct br_port_msg))
469 + nla_total_size(sizeof(__u32));
472 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
475 struct net *net = dev_net(dev);
480 ifindex = port ? port->dev->ifindex : 0;
481 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
485 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
491 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
495 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
498 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
500 if (entry->ifindex == 0)
503 if (entry->addr.proto == htons(ETH_P_IP)) {
504 if (!ipv4_is_multicast(entry->addr.u.ip4))
506 if (ipv4_is_local_multicast(entry->addr.u.ip4))
508 #if IS_ENABLED(CONFIG_IPV6)
509 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
510 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
515 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
517 if (entry->vid >= VLAN_VID_MASK)
523 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
524 struct net_device **pdev, struct br_mdb_entry **pentry)
526 struct net *net = sock_net(skb->sk);
527 struct br_mdb_entry *entry;
528 struct br_port_msg *bpm;
529 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
530 struct net_device *dev;
533 err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
534 MDBA_SET_ENTRY_MAX, NULL, NULL);
538 bpm = nlmsg_data(nlh);
539 if (bpm->ifindex == 0) {
540 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
544 dev = __dev_get_by_index(net, bpm->ifindex);
546 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
550 if (!(dev->priv_flags & IFF_EBRIDGE)) {
551 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
557 if (!tb[MDBA_SET_ENTRY] ||
558 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
559 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
563 entry = nla_data(tb[MDBA_SET_ENTRY]);
564 if (!is_valid_mdb_entry(entry)) {
565 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
573 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
574 struct br_ip *group, unsigned char state)
576 struct net_bridge_mdb_entry *mp;
577 struct net_bridge_port_group *p;
578 struct net_bridge_port_group __rcu **pp;
579 unsigned long now = jiffies;
582 mp = br_mdb_ip_get(br, group);
584 mp = br_multicast_new_group(br, group);
585 err = PTR_ERR_OR_ZERO(mp);
590 for (pp = &mp->ports;
591 (p = mlock_dereference(*pp, br)) != NULL;
595 if ((unsigned long)p->port < (unsigned long)port)
599 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
602 rcu_assign_pointer(*pp, p);
603 if (state == MDB_TEMPORARY)
604 mod_timer(&p->timer, now + br->multicast_membership_interval);
609 static int __br_mdb_add(struct net *net, struct net_bridge *br,
610 struct br_mdb_entry *entry)
613 struct net_device *dev;
614 struct net_bridge_port *p;
617 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
620 dev = __dev_get_by_index(net, entry->ifindex);
624 p = br_port_get_rtnl(dev);
625 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
628 __mdb_entry_to_br_ip(entry, &ip);
630 spin_lock_bh(&br->multicast_lock);
631 ret = br_mdb_add_group(br, p, &ip, entry->state);
632 spin_unlock_bh(&br->multicast_lock);
636 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
637 struct netlink_ext_ack *extack)
639 struct net *net = sock_net(skb->sk);
640 struct net_bridge_vlan_group *vg;
641 struct net_device *dev, *pdev;
642 struct br_mdb_entry *entry;
643 struct net_bridge_port *p;
644 struct net_bridge_vlan *v;
645 struct net_bridge *br;
648 err = br_mdb_parse(skb, nlh, &dev, &entry);
652 br = netdev_priv(dev);
654 /* If vlan filtering is enabled and VLAN is not specified
655 * install mdb entry on all vlans configured on the port.
657 pdev = __dev_get_by_index(net, entry->ifindex);
661 p = br_port_get_rtnl(pdev);
662 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
665 vg = nbp_vlan_group(p);
666 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
667 list_for_each_entry(v, &vg->vlan_list, vlist) {
669 err = __br_mdb_add(net, br, entry);
672 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
675 err = __br_mdb_add(net, br, entry);
677 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
683 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
685 struct net_bridge_mdb_entry *mp;
686 struct net_bridge_port_group *p;
687 struct net_bridge_port_group __rcu **pp;
691 if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
694 __mdb_entry_to_br_ip(entry, &ip);
696 spin_lock_bh(&br->multicast_lock);
697 mp = br_mdb_ip_get(br, &ip);
701 for (pp = &mp->ports;
702 (p = mlock_dereference(*pp, br)) != NULL;
704 if (!p->port || p->port->dev->ifindex != entry->ifindex)
707 if (p->port->state == BR_STATE_DISABLED)
710 __mdb_entry_fill_flags(entry, p->flags);
711 rcu_assign_pointer(*pp, p->next);
712 hlist_del_init(&p->mglist);
713 del_timer(&p->timer);
717 if (!mp->ports && !mp->host_joined &&
718 netif_running(br->dev))
719 mod_timer(&mp->timer, jiffies);
724 spin_unlock_bh(&br->multicast_lock);
728 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
729 struct netlink_ext_ack *extack)
731 struct net *net = sock_net(skb->sk);
732 struct net_bridge_vlan_group *vg;
733 struct net_device *dev, *pdev;
734 struct br_mdb_entry *entry;
735 struct net_bridge_port *p;
736 struct net_bridge_vlan *v;
737 struct net_bridge *br;
740 err = br_mdb_parse(skb, nlh, &dev, &entry);
744 br = netdev_priv(dev);
746 /* If vlan filtering is enabled and VLAN is not specified
747 * delete mdb entry on all vlans configured on the port.
749 pdev = __dev_get_by_index(net, entry->ifindex);
753 p = br_port_get_rtnl(pdev);
754 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
757 vg = nbp_vlan_group(p);
758 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
759 list_for_each_entry(v, &vg->vlan_list, vlist) {
761 err = __br_mdb_del(br, entry);
763 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
766 err = __br_mdb_del(br, entry);
768 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
774 void br_mdb_init(void)
776 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
777 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
778 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
781 void br_mdb_uninit(void)
783 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
784 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
785 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);