2 #include <linux/igmp.h>
3 #include <linux/kernel.h>
4 #include <linux/netdevice.h>
5 #include <linux/rculist.h>
6 #include <linux/skbuff.h>
7 #include <linux/if_ether.h>
9 #include <net/netlink.h>
10 #include <net/switchdev.h>
11 #if IS_ENABLED(CONFIG_IPV6)
13 #include <net/addrconf.h>
16 #include "br_private.h"
18 static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
19 struct net_device *dev)
21 struct net_bridge *br = netdev_priv(dev);
22 struct net_bridge_port *p;
23 struct nlattr *nest, *port_nest;
25 if (!br->multicast_router || hlist_empty(&br->router_list))
28 nest = nla_nest_start(skb, MDBA_ROUTER);
32 hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
35 port_nest = nla_nest_start(skb, MDBA_ROUTER_PORT);
38 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
39 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
40 br_timer_value(&p->multicast_router_timer)) ||
41 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
42 p->multicast_router)) {
43 nla_nest_cancel(skb, port_nest);
46 nla_nest_end(skb, port_nest);
49 nla_nest_end(skb, nest);
52 nla_nest_cancel(skb, nest);
56 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
58 e->state = flags & MDB_PG_FLAGS_PERMANENT;
60 if (flags & MDB_PG_FLAGS_OFFLOAD)
61 e->flags |= MDB_FLAGS_OFFLOAD;
64 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
65 struct net_device *dev)
67 struct net_bridge *br = netdev_priv(dev);
68 struct net_bridge_mdb_htable *mdb;
69 struct nlattr *nest, *nest2;
71 int idx = 0, s_idx = cb->args[1];
73 if (br->multicast_disabled)
76 mdb = rcu_dereference(br->mdb);
80 nest = nla_nest_start(skb, MDBA_MDB);
84 for (i = 0; i < mdb->max; i++) {
85 struct net_bridge_mdb_entry *mp;
86 struct net_bridge_port_group *p;
87 struct net_bridge_port_group __rcu **pp;
88 struct net_bridge_port *port;
90 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
94 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
100 for (pp = &mp->ports;
101 (p = rcu_dereference(*pp)) != NULL;
103 struct nlattr *nest_ent;
104 struct br_mdb_entry e;
110 memset(&e, 0, sizeof(e));
111 e.ifindex = port->dev->ifindex;
113 __mdb_entry_fill_flags(&e, p->flags);
114 if (p->addr.proto == htons(ETH_P_IP))
115 e.addr.u.ip4 = p->addr.u.ip4;
116 #if IS_ENABLED(CONFIG_IPV6)
117 if (p->addr.proto == htons(ETH_P_IPV6))
118 e.addr.u.ip6 = p->addr.u.ip6;
120 e.addr.proto = p->addr.proto;
121 nest_ent = nla_nest_start(skb,
122 MDBA_MDB_ENTRY_INFO);
124 nla_nest_cancel(skb, nest2);
128 if (nla_put_nohdr(skb, sizeof(e), &e) ||
130 MDBA_MDB_EATTR_TIMER,
131 br_timer_value(&p->timer))) {
132 nla_nest_cancel(skb, nest_ent);
133 nla_nest_cancel(skb, nest2);
137 nla_nest_end(skb, nest_ent);
139 nla_nest_end(skb, nest2);
147 nla_nest_end(skb, nest);
151 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
153 struct net_device *dev;
154 struct net *net = sock_net(skb->sk);
155 struct nlmsghdr *nlh = NULL;
162 /* In theory this could be wrapped to 0... */
163 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
165 for_each_netdev_rcu(net, dev) {
166 if (dev->priv_flags & IFF_EBRIDGE) {
167 struct br_port_msg *bpm;
172 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
173 cb->nlh->nlmsg_seq, RTM_GETMDB,
174 sizeof(*bpm), NLM_F_MULTI);
178 bpm = nlmsg_data(nlh);
179 memset(bpm, 0, sizeof(*bpm));
180 bpm->ifindex = dev->ifindex;
181 if (br_mdb_fill_info(skb, cb, dev) < 0)
183 if (br_rports_fill_info(skb, cb, dev) < 0)
201 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
202 struct net_device *dev,
203 struct br_mdb_entry *entry, u32 pid,
204 u32 seq, int type, unsigned int flags)
206 struct nlmsghdr *nlh;
207 struct br_port_msg *bpm;
208 struct nlattr *nest, *nest2;
210 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
214 bpm = nlmsg_data(nlh);
215 memset(bpm, 0, sizeof(*bpm));
216 bpm->family = AF_BRIDGE;
217 bpm->ifindex = dev->ifindex;
218 nest = nla_nest_start(skb, MDBA_MDB);
221 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
225 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
228 nla_nest_end(skb, nest2);
229 nla_nest_end(skb, nest);
234 nla_nest_end(skb, nest);
236 nlmsg_cancel(skb, nlh);
240 static inline size_t rtnl_mdb_nlmsg_size(void)
242 return NLMSG_ALIGN(sizeof(struct br_port_msg))
243 + nla_total_size(sizeof(struct br_mdb_entry));
246 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
247 int type, struct net_bridge_port_group *pg)
249 struct switchdev_obj_port_mdb mdb = {
251 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
252 .flags = SWITCHDEV_F_DEFER,
256 struct net_device *port_dev;
257 struct net *net = dev_net(dev);
261 port_dev = __dev_get_by_index(net, entry->ifindex);
262 if (entry->addr.proto == htons(ETH_P_IP))
263 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
264 #if IS_ENABLED(CONFIG_IPV6)
266 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
269 mdb.obj.orig_dev = port_dev;
270 if (port_dev && type == RTM_NEWMDB) {
271 err = switchdev_port_obj_add(port_dev, &mdb.obj);
273 pg->flags |= MDB_PG_FLAGS_OFFLOAD;
274 } else if (port_dev && type == RTM_DELMDB) {
275 switchdev_port_obj_del(port_dev, &mdb.obj);
278 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
282 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
288 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
291 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
294 void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
297 struct br_mdb_entry entry;
299 memset(&entry, 0, sizeof(entry));
300 entry.ifindex = pg->port->dev->ifindex;
301 entry.addr.proto = pg->addr.proto;
302 entry.addr.u.ip4 = pg->addr.u.ip4;
303 #if IS_ENABLED(CONFIG_IPV6)
304 entry.addr.u.ip6 = pg->addr.u.ip6;
306 entry.vid = pg->addr.vid;
307 __mdb_entry_fill_flags(&entry, pg->flags);
308 __br_mdb_notify(dev, &entry, type, pg);
311 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
312 struct net_device *dev,
313 int ifindex, u32 pid,
314 u32 seq, int type, unsigned int flags)
316 struct br_port_msg *bpm;
317 struct nlmsghdr *nlh;
320 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
324 bpm = nlmsg_data(nlh);
325 memset(bpm, 0, sizeof(*bpm));
326 bpm->family = AF_BRIDGE;
327 bpm->ifindex = dev->ifindex;
328 nest = nla_nest_start(skb, MDBA_ROUTER);
332 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
335 nla_nest_end(skb, nest);
340 nla_nest_end(skb, nest);
342 nlmsg_cancel(skb, nlh);
346 static inline size_t rtnl_rtr_nlmsg_size(void)
348 return NLMSG_ALIGN(sizeof(struct br_port_msg))
349 + nla_total_size(sizeof(__u32));
352 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
355 struct net *net = dev_net(dev);
360 ifindex = port ? port->dev->ifindex : 0;
361 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
365 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
371 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
375 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
378 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
380 if (entry->ifindex == 0)
383 if (entry->addr.proto == htons(ETH_P_IP)) {
384 if (!ipv4_is_multicast(entry->addr.u.ip4))
386 if (ipv4_is_local_multicast(entry->addr.u.ip4))
388 #if IS_ENABLED(CONFIG_IPV6)
389 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
390 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
395 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
397 if (entry->vid >= VLAN_VID_MASK)
403 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
404 struct net_device **pdev, struct br_mdb_entry **pentry)
406 struct net *net = sock_net(skb->sk);
407 struct br_mdb_entry *entry;
408 struct br_port_msg *bpm;
409 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
410 struct net_device *dev;
413 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
417 bpm = nlmsg_data(nlh);
418 if (bpm->ifindex == 0) {
419 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
423 dev = __dev_get_by_index(net, bpm->ifindex);
425 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
429 if (!(dev->priv_flags & IFF_EBRIDGE)) {
430 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
436 if (!tb[MDBA_SET_ENTRY] ||
437 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
438 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
442 entry = nla_data(tb[MDBA_SET_ENTRY]);
443 if (!is_valid_mdb_entry(entry)) {
444 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
452 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
453 struct br_ip *group, unsigned char state,
454 struct net_bridge_port_group **pg)
456 struct net_bridge_mdb_entry *mp;
457 struct net_bridge_port_group *p;
458 struct net_bridge_port_group __rcu **pp;
459 struct net_bridge_mdb_htable *mdb;
460 unsigned long now = jiffies;
463 mdb = mlock_dereference(br->mdb, br);
464 mp = br_mdb_ip_get(mdb, group);
466 mp = br_multicast_new_group(br, port, group);
467 err = PTR_ERR_OR_ZERO(mp);
472 for (pp = &mp->ports;
473 (p = mlock_dereference(*pp, br)) != NULL;
477 if ((unsigned long)p->port < (unsigned long)port)
481 p = br_multicast_new_port_group(port, group, *pp, state);
484 rcu_assign_pointer(*pp, p);
486 if (state == MDB_TEMPORARY)
487 mod_timer(&p->timer, now + br->multicast_membership_interval);
492 static int __br_mdb_add(struct net *net, struct net_bridge *br,
493 struct br_mdb_entry *entry,
494 struct net_bridge_port_group **pg)
497 struct net_device *dev;
498 struct net_bridge_port *p;
501 if (!netif_running(br->dev) || br->multicast_disabled)
504 dev = __dev_get_by_index(net, entry->ifindex);
508 p = br_port_get_rtnl(dev);
509 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
512 memset(&ip, 0, sizeof(ip));
514 ip.proto = entry->addr.proto;
515 if (ip.proto == htons(ETH_P_IP))
516 ip.u.ip4 = entry->addr.u.ip4;
517 #if IS_ENABLED(CONFIG_IPV6)
519 ip.u.ip6 = entry->addr.u.ip6;
522 spin_lock_bh(&br->multicast_lock);
523 ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
524 spin_unlock_bh(&br->multicast_lock);
528 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
530 struct net *net = sock_net(skb->sk);
531 struct net_bridge_port_group *pg;
532 struct net_bridge_vlan_group *vg;
533 struct net_device *dev, *pdev;
534 struct br_mdb_entry *entry;
535 struct net_bridge_port *p;
536 struct net_bridge_vlan *v;
537 struct net_bridge *br;
540 err = br_mdb_parse(skb, nlh, &dev, &entry);
544 br = netdev_priv(dev);
546 /* If vlan filtering is enabled and VLAN is not specified
547 * install mdb entry on all vlans configured on the port.
549 pdev = __dev_get_by_index(net, entry->ifindex);
553 p = br_port_get_rtnl(pdev);
554 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
557 vg = nbp_vlan_group(p);
558 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
559 list_for_each_entry(v, &vg->vlan_list, vlist) {
561 err = __br_mdb_add(net, br, entry, &pg);
564 __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
567 err = __br_mdb_add(net, br, entry, &pg);
569 __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
575 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
577 struct net_bridge_mdb_htable *mdb;
578 struct net_bridge_mdb_entry *mp;
579 struct net_bridge_port_group *p;
580 struct net_bridge_port_group __rcu **pp;
584 if (!netif_running(br->dev) || br->multicast_disabled)
587 memset(&ip, 0, sizeof(ip));
589 ip.proto = entry->addr.proto;
590 if (ip.proto == htons(ETH_P_IP))
591 ip.u.ip4 = entry->addr.u.ip4;
592 #if IS_ENABLED(CONFIG_IPV6)
594 ip.u.ip6 = entry->addr.u.ip6;
597 spin_lock_bh(&br->multicast_lock);
598 mdb = mlock_dereference(br->mdb, br);
600 mp = br_mdb_ip_get(mdb, &ip);
604 for (pp = &mp->ports;
605 (p = mlock_dereference(*pp, br)) != NULL;
607 if (!p->port || p->port->dev->ifindex != entry->ifindex)
610 if (p->port->state == BR_STATE_DISABLED)
613 __mdb_entry_fill_flags(entry, p->flags);
614 rcu_assign_pointer(*pp, p->next);
615 hlist_del_init(&p->mglist);
616 del_timer(&p->timer);
617 call_rcu_bh(&p->rcu, br_multicast_free_pg);
620 if (!mp->ports && !mp->mglist &&
621 netif_running(br->dev))
622 mod_timer(&mp->timer, jiffies);
627 spin_unlock_bh(&br->multicast_lock);
631 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
633 struct net *net = sock_net(skb->sk);
634 struct net_bridge_vlan_group *vg;
635 struct net_device *dev, *pdev;
636 struct br_mdb_entry *entry;
637 struct net_bridge_port *p;
638 struct net_bridge_vlan *v;
639 struct net_bridge *br;
642 err = br_mdb_parse(skb, nlh, &dev, &entry);
646 br = netdev_priv(dev);
648 /* If vlan filtering is enabled and VLAN is not specified
649 * delete mdb entry on all vlans configured on the port.
651 pdev = __dev_get_by_index(net, entry->ifindex);
655 p = br_port_get_rtnl(pdev);
656 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
659 vg = nbp_vlan_group(p);
660 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
661 list_for_each_entry(v, &vg->vlan_list, vlist) {
663 err = __br_mdb_del(br, entry);
665 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
668 err = __br_mdb_del(br, entry);
670 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
676 void br_mdb_init(void)
678 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
679 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
680 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
683 void br_mdb_uninit(void)
685 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
686 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
687 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);