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
), NLM_F_MULTI
);
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
);