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
);