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;
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) {
33 if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
37 nla_nest_end(skb, nest);
40 nla_nest_cancel(skb, nest);
44 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
46 e->state = flags & MDB_PG_FLAGS_PERMANENT;
48 if (flags & MDB_PG_FLAGS_OFFLOAD)
49 e->flags |= MDB_FLAGS_OFFLOAD;
52 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
53 struct net_device *dev)
55 struct net_bridge *br = netdev_priv(dev);
56 struct net_bridge_mdb_htable *mdb;
57 struct nlattr *nest, *nest2;
59 int idx = 0, s_idx = cb->args[1];
61 if (br->multicast_disabled)
64 mdb = rcu_dereference(br->mdb);
68 nest = nla_nest_start(skb, MDBA_MDB);
72 for (i = 0; i < mdb->max; i++) {
73 struct net_bridge_mdb_entry *mp;
74 struct net_bridge_port_group *p;
75 struct net_bridge_port_group __rcu **pp;
76 struct net_bridge_port *port;
78 hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
82 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
89 (p = rcu_dereference(*pp)) != NULL;
91 struct nlattr *nest_ent;
92 struct br_mdb_entry e;
98 memset(&e, 0, sizeof(e));
99 e.ifindex = port->dev->ifindex;
101 __mdb_entry_fill_flags(&e, p->flags);
102 if (p->addr.proto == htons(ETH_P_IP))
103 e.addr.u.ip4 = p->addr.u.ip4;
104 #if IS_ENABLED(CONFIG_IPV6)
105 if (p->addr.proto == htons(ETH_P_IPV6))
106 e.addr.u.ip6 = p->addr.u.ip6;
108 e.addr.proto = p->addr.proto;
109 nest_ent = nla_nest_start(skb,
110 MDBA_MDB_ENTRY_INFO);
112 nla_nest_cancel(skb, nest2);
116 if (nla_put_nohdr(skb, sizeof(e), &e) ||
118 MDBA_MDB_EATTR_TIMER,
119 br_timer_value(&p->timer))) {
120 nla_nest_cancel(skb, nest_ent);
121 nla_nest_cancel(skb, nest2);
125 nla_nest_end(skb, nest_ent);
127 nla_nest_end(skb, nest2);
135 nla_nest_end(skb, nest);
139 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
141 struct net_device *dev;
142 struct net *net = sock_net(skb->sk);
143 struct nlmsghdr *nlh = NULL;
150 /* In theory this could be wrapped to 0... */
151 cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
153 for_each_netdev_rcu(net, dev) {
154 if (dev->priv_flags & IFF_EBRIDGE) {
155 struct br_port_msg *bpm;
160 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
161 cb->nlh->nlmsg_seq, RTM_GETMDB,
162 sizeof(*bpm), NLM_F_MULTI);
166 bpm = nlmsg_data(nlh);
167 memset(bpm, 0, sizeof(*bpm));
168 bpm->ifindex = dev->ifindex;
169 if (br_mdb_fill_info(skb, cb, dev) < 0)
171 if (br_rports_fill_info(skb, cb, dev) < 0)
189 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
190 struct net_device *dev,
191 struct br_mdb_entry *entry, u32 pid,
192 u32 seq, int type, unsigned int flags)
194 struct nlmsghdr *nlh;
195 struct br_port_msg *bpm;
196 struct nlattr *nest, *nest2;
198 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
202 bpm = nlmsg_data(nlh);
203 memset(bpm, 0, sizeof(*bpm));
204 bpm->family = AF_BRIDGE;
205 bpm->ifindex = dev->ifindex;
206 nest = nla_nest_start(skb, MDBA_MDB);
209 nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
213 if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
216 nla_nest_end(skb, nest2);
217 nla_nest_end(skb, nest);
222 nla_nest_end(skb, nest);
224 nlmsg_cancel(skb, nlh);
228 static inline size_t rtnl_mdb_nlmsg_size(void)
230 return NLMSG_ALIGN(sizeof(struct br_port_msg))
231 + nla_total_size(sizeof(struct br_mdb_entry));
234 static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
235 int type, struct net_bridge_port_group *pg)
237 struct switchdev_obj_port_mdb mdb = {
239 .id = SWITCHDEV_OBJ_ID_PORT_MDB,
240 .flags = SWITCHDEV_F_DEFER,
244 struct net_device *port_dev;
245 struct net *net = dev_net(dev);
249 port_dev = __dev_get_by_index(net, entry->ifindex);
250 if (entry->addr.proto == htons(ETH_P_IP))
251 ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
252 #if IS_ENABLED(CONFIG_IPV6)
254 ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
257 mdb.obj.orig_dev = port_dev;
258 if (port_dev && type == RTM_NEWMDB) {
259 err = switchdev_port_obj_add(port_dev, &mdb.obj);
261 pg->flags |= MDB_PG_FLAGS_OFFLOAD;
262 } else if (port_dev && type == RTM_DELMDB) {
263 switchdev_port_obj_del(port_dev, &mdb.obj);
266 skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
270 err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
276 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
279 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
282 void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
285 struct br_mdb_entry entry;
287 memset(&entry, 0, sizeof(entry));
288 entry.ifindex = pg->port->dev->ifindex;
289 entry.addr.proto = pg->addr.proto;
290 entry.addr.u.ip4 = pg->addr.u.ip4;
291 #if IS_ENABLED(CONFIG_IPV6)
292 entry.addr.u.ip6 = pg->addr.u.ip6;
294 entry.vid = pg->addr.vid;
295 __mdb_entry_fill_flags(&entry, pg->flags);
296 __br_mdb_notify(dev, &entry, type, pg);
299 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
300 struct net_device *dev,
301 int ifindex, u32 pid,
302 u32 seq, int type, unsigned int flags)
304 struct br_port_msg *bpm;
305 struct nlmsghdr *nlh;
308 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
312 bpm = nlmsg_data(nlh);
313 memset(bpm, 0, sizeof(*bpm));
314 bpm->family = AF_BRIDGE;
315 bpm->ifindex = dev->ifindex;
316 nest = nla_nest_start(skb, MDBA_ROUTER);
320 if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
323 nla_nest_end(skb, nest);
328 nla_nest_end(skb, nest);
330 nlmsg_cancel(skb, nlh);
334 static inline size_t rtnl_rtr_nlmsg_size(void)
336 return NLMSG_ALIGN(sizeof(struct br_port_msg))
337 + nla_total_size(sizeof(__u32));
340 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
343 struct net *net = dev_net(dev);
348 ifindex = port ? port->dev->ifindex : 0;
349 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
353 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
359 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
363 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
366 static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
368 if (entry->ifindex == 0)
371 if (entry->addr.proto == htons(ETH_P_IP)) {
372 if (!ipv4_is_multicast(entry->addr.u.ip4))
374 if (ipv4_is_local_multicast(entry->addr.u.ip4))
376 #if IS_ENABLED(CONFIG_IPV6)
377 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
378 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
383 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
385 if (entry->vid >= VLAN_VID_MASK)
391 static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
392 struct net_device **pdev, struct br_mdb_entry **pentry)
394 struct net *net = sock_net(skb->sk);
395 struct br_mdb_entry *entry;
396 struct br_port_msg *bpm;
397 struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
398 struct net_device *dev;
401 err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
405 bpm = nlmsg_data(nlh);
406 if (bpm->ifindex == 0) {
407 pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
411 dev = __dev_get_by_index(net, bpm->ifindex);
413 pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
417 if (!(dev->priv_flags & IFF_EBRIDGE)) {
418 pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
424 if (!tb[MDBA_SET_ENTRY] ||
425 nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
426 pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
430 entry = nla_data(tb[MDBA_SET_ENTRY]);
431 if (!is_valid_mdb_entry(entry)) {
432 pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
440 static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
441 struct br_ip *group, unsigned char state,
442 struct net_bridge_port_group **pg)
444 struct net_bridge_mdb_entry *mp;
445 struct net_bridge_port_group *p;
446 struct net_bridge_port_group __rcu **pp;
447 struct net_bridge_mdb_htable *mdb;
448 unsigned long now = jiffies;
451 mdb = mlock_dereference(br->mdb, br);
452 mp = br_mdb_ip_get(mdb, group);
454 mp = br_multicast_new_group(br, port, group);
455 err = PTR_ERR_OR_ZERO(mp);
460 for (pp = &mp->ports;
461 (p = mlock_dereference(*pp, br)) != NULL;
465 if ((unsigned long)p->port < (unsigned long)port)
469 p = br_multicast_new_port_group(port, group, *pp, state);
472 rcu_assign_pointer(*pp, p);
474 if (state == MDB_TEMPORARY)
475 mod_timer(&p->timer, now + br->multicast_membership_interval);
480 static int __br_mdb_add(struct net *net, struct net_bridge *br,
481 struct br_mdb_entry *entry,
482 struct net_bridge_port_group **pg)
485 struct net_device *dev;
486 struct net_bridge_port *p;
489 if (!netif_running(br->dev) || br->multicast_disabled)
492 dev = __dev_get_by_index(net, entry->ifindex);
496 p = br_port_get_rtnl(dev);
497 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
500 memset(&ip, 0, sizeof(ip));
502 ip.proto = entry->addr.proto;
503 if (ip.proto == htons(ETH_P_IP))
504 ip.u.ip4 = entry->addr.u.ip4;
505 #if IS_ENABLED(CONFIG_IPV6)
507 ip.u.ip6 = entry->addr.u.ip6;
510 spin_lock_bh(&br->multicast_lock);
511 ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
512 spin_unlock_bh(&br->multicast_lock);
516 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
518 struct net *net = sock_net(skb->sk);
519 struct net_bridge_port_group *pg;
520 struct net_bridge_vlan_group *vg;
521 struct net_device *dev, *pdev;
522 struct br_mdb_entry *entry;
523 struct net_bridge_port *p;
524 struct net_bridge_vlan *v;
525 struct net_bridge *br;
528 err = br_mdb_parse(skb, nlh, &dev, &entry);
532 br = netdev_priv(dev);
534 /* If vlan filtering is enabled and VLAN is not specified
535 * install mdb entry on all vlans configured on the port.
537 pdev = __dev_get_by_index(net, entry->ifindex);
541 p = br_port_get_rtnl(pdev);
542 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
545 vg = nbp_vlan_group(p);
546 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
547 list_for_each_entry(v, &vg->vlan_list, vlist) {
549 err = __br_mdb_add(net, br, entry, &pg);
552 __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
555 err = __br_mdb_add(net, br, entry, &pg);
557 __br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
563 static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
565 struct net_bridge_mdb_htable *mdb;
566 struct net_bridge_mdb_entry *mp;
567 struct net_bridge_port_group *p;
568 struct net_bridge_port_group __rcu **pp;
572 if (!netif_running(br->dev) || br->multicast_disabled)
575 memset(&ip, 0, sizeof(ip));
577 ip.proto = entry->addr.proto;
578 if (ip.proto == htons(ETH_P_IP))
579 ip.u.ip4 = entry->addr.u.ip4;
580 #if IS_ENABLED(CONFIG_IPV6)
582 ip.u.ip6 = entry->addr.u.ip6;
585 spin_lock_bh(&br->multicast_lock);
586 mdb = mlock_dereference(br->mdb, br);
588 mp = br_mdb_ip_get(mdb, &ip);
592 for (pp = &mp->ports;
593 (p = mlock_dereference(*pp, br)) != NULL;
595 if (!p->port || p->port->dev->ifindex != entry->ifindex)
598 if (p->port->state == BR_STATE_DISABLED)
601 __mdb_entry_fill_flags(entry, p->flags);
602 rcu_assign_pointer(*pp, p->next);
603 hlist_del_init(&p->mglist);
604 del_timer(&p->timer);
605 call_rcu_bh(&p->rcu, br_multicast_free_pg);
608 if (!mp->ports && !mp->mglist &&
609 netif_running(br->dev))
610 mod_timer(&mp->timer, jiffies);
615 spin_unlock_bh(&br->multicast_lock);
619 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
621 struct net *net = sock_net(skb->sk);
622 struct net_bridge_vlan_group *vg;
623 struct net_device *dev, *pdev;
624 struct br_mdb_entry *entry;
625 struct net_bridge_port *p;
626 struct net_bridge_vlan *v;
627 struct net_bridge *br;
630 err = br_mdb_parse(skb, nlh, &dev, &entry);
634 br = netdev_priv(dev);
636 /* If vlan filtering is enabled and VLAN is not specified
637 * delete mdb entry on all vlans configured on the port.
639 pdev = __dev_get_by_index(net, entry->ifindex);
643 p = br_port_get_rtnl(pdev);
644 if (!p || p->br != br || p->state == BR_STATE_DISABLED)
647 vg = nbp_vlan_group(p);
648 if (br_vlan_enabled(br) && vg && entry->vid == 0) {
649 list_for_each_entry(v, &vg->vlan_list, vlist) {
651 err = __br_mdb_del(br, entry);
653 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
656 err = __br_mdb_del(br, entry);
658 __br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
664 void br_mdb_init(void)
666 rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
667 rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
668 rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
671 void br_mdb_uninit(void)
673 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
674 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
675 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);