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_notify(struct net_device *dev, struct net_bridge_port *p,
296 struct br_mdb_entry *entry, int type)
298 struct br_mdb_complete_info *complete_info;
299 struct switchdev_obj_port_mdb mdb = {
301 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
302 .flags = SWITCHDEV_F_DEFER,
306 struct net_device *port_dev;
307 struct net *net = dev_net(dev);
311 port_dev = __dev_get_by_index(net, entry->ifindex);
312 if (entry->addr.proto == htons(ETH_P_IP))
313 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
314 #if IS_ENABLED(CONFIG_IPV6)
316 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
319 mdb.obj.orig_dev = port_dev;
320 if (port_dev && type == RTM_NEWMDB) {
321 complete_info = kmalloc(sizeof(*complete_info), GFP_ATOMIC);
323 complete_info->port = p;
324 __mdb_entry_to_br_ip(entry, &complete_info->ip);
325 mdb.obj.complete_priv = complete_info;
326 mdb.obj.complete = br_mdb_complete;
327 if (switchdev_port_obj_add(port_dev, &mdb.obj))
328 kfree(complete_info);
330 } else if (port_dev && type == RTM_DELMDB) {
331 switchdev_port_obj_del(port_dev, &mdb.obj);
334 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
338 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
344 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
347 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
350 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
351 struct br_ip *group, int type, u8 flags)
353 struct br_mdb_entry entry;
355 memset(&entry, 0, sizeof(entry));
356 entry.ifindex = port->dev->ifindex;
357 entry.addr.proto = group->proto;
358 entry.addr.u.ip4 = group->u.ip4;
359 #if IS_ENABLED(CONFIG_IPV6)
360 entry.addr.u.ip6 = group->u.ip6;
362 entry.vid = group->vid;
363 __mdb_entry_fill_flags(&entry, flags);
364 __br_mdb_notify(dev, port, &entry, type);
367 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
368 struct net_device *dev,
369 int ifindex, u32 pid,
370 u32 seq, int type, unsigned int flags)
372 struct br_port_msg *bpm;
373 struct nlmsghdr *nlh;
376 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
380 bpm = nlmsg_data(nlh);
381 memset(bpm, 0, sizeof(*bpm));
382 bpm->family = AF_BRIDGE;
383 bpm->ifindex = dev->ifindex;
384 nest = nla_nest_start(skb, MDBA_ROUTER);
388 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
391 nla_nest_end(skb, nest);
396 nla_nest_end(skb, nest);
398 nlmsg_cancel(skb, nlh);
402 static inline size_t rtnl_rtr_nlmsg_size(void)
404 return NLMSG_ALIGN(sizeof(struct br_port_msg))
405 + nla_total_size(sizeof(__u32));
408 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
411 struct net *net = dev_net(dev);
416 ifindex = port ? port->dev->ifindex : 0;
417 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
421 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
427 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
431 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
434 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
436 if (entry->ifindex == 0)
439 if (entry->addr.proto == htons(ETH_P_IP)) {
440 if (!ipv4_is_multicast(entry->addr.u.ip4))
442 if (ipv4_is_local_multicast(entry->addr.u.ip4))
444 #if IS_ENABLED(CONFIG_IPV6)
445 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
446 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
451 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
453 if (entry->vid >= VLAN_VID_MASK)
459 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
460 struct net_device **pdev, struct br_mdb_entry **pentry)
462 struct net *net = sock_net(skb->sk);
463 struct br_mdb_entry *entry;
464 struct br_port_msg *bpm;
465 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
466 struct net_device *dev;
469 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL,
474 bpm = nlmsg_data(nlh);
475 if (bpm->ifindex == 0) {
476 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
480 dev = __dev_get_by_index(net, bpm->ifindex);
482 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
486 if (!(dev->priv_flags & IFF_EBRIDGE)) {
487 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
493 if (!tb[MDBA_SET_ENTRY] ||
494 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
495 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
499 entry = nla_data(tb[MDBA_SET_ENTRY]);
500 if (!is_valid_mdb_entry(entry)) {
501 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
509 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
510 struct br_ip *group, unsigned char state)
512 struct net_bridge_mdb_entry *mp;
513 struct net_bridge_port_group *p;
514 struct net_bridge_port_group __rcu **pp;
515 struct net_bridge_mdb_htable *mdb;
516 unsigned long now = jiffies;
519 mdb = mlock_dereference(br->mdb, br);
520 mp = br_mdb_ip_get(mdb, group);
522 mp = br_multicast_new_group(br, port, group);
523 err = PTR_ERR_OR_ZERO(mp);
528 for (pp = &mp->ports;
529 (p = mlock_dereference(*pp, br)) != NULL;
533 if ((unsigned long)p->port < (unsigned long)port)
537 p = br_multicast_new_port_group(port, group, *pp, state, NULL);
540 rcu_assign_pointer(*pp, p);
541 if (state == MDB_TEMPORARY)
542 mod_timer(&p->timer, now + br->multicast_membership_interval);
547 static int __br_mdb_add(struct net *net, struct net_bridge *br,
548 struct br_mdb_entry *entry)
551 struct net_device *dev;
552 struct net_bridge_port *p;
555 if (!netif_running(br->dev) || br->multicast_disabled)
558 dev = __dev_get_by_index(net, entry->ifindex);
562 p = br_port_get_rtnl(dev);
563 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
566 __mdb_entry_to_br_ip(entry, &ip);
568 spin_lock_bh(&br->multicast_lock);
569 ret = br_mdb_add_group(br, p, &ip, entry->state);
570 spin_unlock_bh(&br->multicast_lock);
574 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
575 struct netlink_ext_ack *extack)
577 struct net *net = sock_net(skb->sk);
578 struct net_bridge_vlan_group *vg;
579 struct net_device *dev, *pdev;
580 struct br_mdb_entry *entry;
581 struct net_bridge_port *p;
582 struct net_bridge_vlan *v;
583 struct net_bridge *br;
586 err = br_mdb_parse(skb, nlh, &dev, &entry);
590 br = netdev_priv(dev);
592 /* If vlan filtering is enabled and VLAN is not specified
593 * install mdb entry on all vlans configured on the port.
595 pdev = __dev_get_by_index(net, entry->ifindex);
599 p = br_port_get_rtnl(pdev);
600 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
603 vg = nbp_vlan_group(p);
604 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
605 list_for_each_entry(v, &vg->vlan_list, vlist) {
607 err = __br_mdb_add(net, br, entry);
610 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
613 err = __br_mdb_add(net, br, entry);
615 __br_mdb_notify(dev, p, entry, RTM_NEWMDB);
621 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
623 struct net_bridge_mdb_htable *mdb;
624 struct net_bridge_mdb_entry *mp;
625 struct net_bridge_port_group *p;
626 struct net_bridge_port_group __rcu **pp;
630 if (!netif_running(br->dev) || br->multicast_disabled)
633 __mdb_entry_to_br_ip(entry, &ip);
635 spin_lock_bh(&br->multicast_lock);
636 mdb = mlock_dereference(br->mdb, br);
638 mp = br_mdb_ip_get(mdb, &ip);
642 for (pp = &mp->ports;
643 (p = mlock_dereference(*pp, br)) != NULL;
645 if (!p->port || p->port->dev->ifindex != entry->ifindex)
648 if (p->port->state == BR_STATE_DISABLED)
651 __mdb_entry_fill_flags(entry, p->flags);
652 rcu_assign_pointer(*pp, p->next);
653 hlist_del_init(&p->mglist);
654 del_timer(&p->timer);
655 call_rcu_bh(&p->rcu, br_multicast_free_pg);
658 if (!mp->ports && !mp->mglist &&
659 netif_running(br->dev))
660 mod_timer(&mp->timer, jiffies);
665 spin_unlock_bh(&br->multicast_lock);
669 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
670 struct netlink_ext_ack *extack)
672 struct net *net = sock_net(skb->sk);
673 struct net_bridge_vlan_group *vg;
674 struct net_device *dev, *pdev;
675 struct br_mdb_entry *entry;
676 struct net_bridge_port *p;
677 struct net_bridge_vlan *v;
678 struct net_bridge *br;
681 err = br_mdb_parse(skb, nlh, &dev, &entry);
685 br = netdev_priv(dev);
687 /* If vlan filtering is enabled and VLAN is not specified
688 * delete mdb entry on all vlans configured on the port.
690 pdev = __dev_get_by_index(net, entry->ifindex);
694 p = br_port_get_rtnl(pdev);
695 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
698 vg = nbp_vlan_group(p);
699 if (br_vlan_enabled(br->dev) && vg && entry->vid == 0) {
700 list_for_each_entry(v, &vg->vlan_list, vlist) {
702 err = __br_mdb_del(br, entry);
704 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
707 err = __br_mdb_del(br, entry);
709 __br_mdb_notify(dev, p, entry, RTM_DELMDB);
715 void br_mdb_init(void)
717 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
718 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
719 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
722 void br_mdb_uninit(void)
724 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
725 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
726 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);