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"
20 br_ip4_rports_get_timer(struct net_bridge_mcast_port *pmctx,
23 *timer = br_timer_value(&pmctx->ip4_mc_router_timer);
24 return !hlist_unhashed(&pmctx->ip4_rlist);
28 br_ip6_rports_get_timer(struct net_bridge_mcast_port *pmctx,
31 #if IS_ENABLED(CONFIG_IPV6)
32 *timer = br_timer_value(&pmctx->ip6_mc_router_timer);
33 return !hlist_unhashed(&pmctx->ip6_rlist);
40 static size_t __br_rports_one_size(void)
42 return nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PORT */
43 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_TIMER */
44 nla_total_size(sizeof(u8)) + /* MDBA_ROUTER_PATTR_TYPE */
45 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET_TIMER */
46 nla_total_size(sizeof(u32)) + /* MDBA_ROUTER_PATTR_INET6_TIMER */
47 nla_total_size(sizeof(u32)); /* MDBA_ROUTER_PATTR_VID */
50 size_t br_rports_size(const struct net_bridge_mcast *brmctx)
52 struct net_bridge_mcast_port *pmctx;
53 size_t size = nla_total_size(0); /* MDBA_ROUTER */
56 hlist_for_each_entry_rcu(pmctx, &brmctx->ip4_mc_router_list,
58 size += __br_rports_one_size();
60 #if IS_ENABLED(CONFIG_IPV6)
61 hlist_for_each_entry_rcu(pmctx, &brmctx->ip6_mc_router_list,
63 size += __br_rports_one_size();
70 int br_rports_fill_info(struct sk_buff *skb,
71 const struct net_bridge_mcast *brmctx)
73 u16 vid = brmctx->vlan ? brmctx->vlan->vid : 0;
74 bool have_ip4_mc_rtr, have_ip6_mc_rtr;
75 unsigned long ip4_timer, ip6_timer;
76 struct nlattr *nest, *port_nest;
77 struct net_bridge_port *p;
79 if (!brmctx->multicast_router || !br_rports_have_mc_router(brmctx))
82 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
86 list_for_each_entry_rcu(p, &brmctx->br->port_list, list) {
87 struct net_bridge_mcast_port *pmctx;
90 struct net_bridge_vlan *v;
92 v = br_vlan_find(nbp_vlan_group(p), vid);
95 pmctx = &v->port_mcast_ctx;
97 pmctx = &p->multicast_ctx;
100 have_ip4_mc_rtr = br_ip4_rports_get_timer(pmctx, &ip4_timer);
101 have_ip6_mc_rtr = br_ip6_rports_get_timer(pmctx, &ip6_timer);
103 if (!have_ip4_mc_rtr && !have_ip6_mc_rtr)
106 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
110 if (nla_put_nohdr(skb, sizeof(u32), &p->dev->ifindex) ||
111 nla_put_u32(skb, MDBA_ROUTER_PATTR_TIMER,
112 max(ip4_timer, ip6_timer)) ||
113 nla_put_u8(skb, MDBA_ROUTER_PATTR_TYPE,
114 p->multicast_ctx.multicast_router) ||
116 nla_put_u32(skb, MDBA_ROUTER_PATTR_INET_TIMER,
119 nla_put_u32(skb, MDBA_ROUTER_PATTR_INET6_TIMER,
121 (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid))) {
122 nla_nest_cancel(skb, port_nest);
125 nla_nest_end(skb, port_nest);
128 nla_nest_end(skb, nest);
131 nla_nest_cancel(skb, nest);
135 static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
137 e->state = flags & MDB_PG_FLAGS_PERMANENT;
139 if (flags & MDB_PG_FLAGS_OFFLOAD)
140 e->flags |= MDB_FLAGS_OFFLOAD;
141 if (flags & MDB_PG_FLAGS_FAST_LEAVE)
142 e->flags |= MDB_FLAGS_FAST_LEAVE;
143 if (flags & MDB_PG_FLAGS_STAR_EXCL)
144 e->flags |= MDB_FLAGS_STAR_EXCL;
145 if (flags & MDB_PG_FLAGS_BLOCKED)
146 e->flags |= MDB_FLAGS_BLOCKED;
149 static void __mdb_entry_to_br_ip(struct br_mdb_entry *entry, struct br_ip *ip,
150 struct nlattr **mdb_attrs)
152 memset(ip, 0, sizeof(struct br_ip));
153 ip->vid = entry->vid;
154 ip->proto = entry->addr.proto;
156 case htons(ETH_P_IP):
157 ip->dst.ip4 = entry->addr.u.ip4;
158 if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
159 ip->src.ip4 = nla_get_in_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
161 #if IS_ENABLED(CONFIG_IPV6)
162 case htons(ETH_P_IPV6):
163 ip->dst.ip6 = entry->addr.u.ip6;
164 if (mdb_attrs && mdb_attrs[MDBE_ATTR_SOURCE])
165 ip->src.ip6 = nla_get_in6_addr(mdb_attrs[MDBE_ATTR_SOURCE]);
169 ether_addr_copy(ip->dst.mac_addr, entry->addr.u.mac_addr);
174 static int __mdb_fill_srcs(struct sk_buff *skb,
175 struct net_bridge_port_group *p)
177 struct net_bridge_group_src *ent;
178 struct nlattr *nest, *nest_ent;
180 if (hlist_empty(&p->src_list))
183 nest = nla_nest_start(skb, MDBA_MDB_EATTR_SRC_LIST);
187 hlist_for_each_entry_rcu(ent, &p->src_list, node,
188 lockdep_is_held(&p->key.port->br->multicast_lock)) {
189 nest_ent = nla_nest_start(skb, MDBA_MDB_SRCLIST_ENTRY);
192 switch (ent->addr.proto) {
193 case htons(ETH_P_IP):
194 if (nla_put_in_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
195 ent->addr.src.ip4)) {
196 nla_nest_cancel(skb, nest_ent);
200 #if IS_ENABLED(CONFIG_IPV6)
201 case htons(ETH_P_IPV6):
202 if (nla_put_in6_addr(skb, MDBA_MDB_SRCATTR_ADDRESS,
203 &ent->addr.src.ip6)) {
204 nla_nest_cancel(skb, nest_ent);
210 nla_nest_cancel(skb, nest_ent);
213 if (nla_put_u32(skb, MDBA_MDB_SRCATTR_TIMER,
214 br_timer_value(&ent->timer))) {
215 nla_nest_cancel(skb, nest_ent);
218 nla_nest_end(skb, nest_ent);
221 nla_nest_end(skb, nest);
226 nla_nest_cancel(skb, nest);
230 static int __mdb_fill_info(struct sk_buff *skb,
231 struct net_bridge_mdb_entry *mp,
232 struct net_bridge_port_group *p)
234 bool dump_srcs_mode = false;
235 struct timer_list *mtimer;
236 struct nlattr *nest_ent;
237 struct br_mdb_entry e;
241 memset(&e, 0, sizeof(e));
243 ifindex = p->key.port->dev->ifindex;
247 ifindex = mp->br->dev->ifindex;
251 __mdb_entry_fill_flags(&e, flags);
253 e.vid = mp->addr.vid;
254 if (mp->addr.proto == htons(ETH_P_IP)) {
255 e.addr.u.ip4 = mp->addr.dst.ip4;
256 #if IS_ENABLED(CONFIG_IPV6)
257 } else if (mp->addr.proto == htons(ETH_P_IPV6)) {
258 e.addr.u.ip6 = mp->addr.dst.ip6;
261 ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
262 e.state = MDB_PG_FLAGS_PERMANENT;
264 e.addr.proto = mp->addr.proto;
265 nest_ent = nla_nest_start_noflag(skb,
266 MDBA_MDB_ENTRY_INFO);
270 if (nla_put_nohdr(skb, sizeof(e), &e) ||
272 MDBA_MDB_EATTR_TIMER,
273 br_timer_value(mtimer)))
276 switch (mp->addr.proto) {
277 case htons(ETH_P_IP):
278 dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_igmp_version == 3);
279 if (mp->addr.src.ip4) {
280 if (nla_put_in_addr(skb, MDBA_MDB_EATTR_SOURCE,
286 #if IS_ENABLED(CONFIG_IPV6)
287 case htons(ETH_P_IPV6):
288 dump_srcs_mode = !!(mp->br->multicast_ctx.multicast_mld_version == 2);
289 if (!ipv6_addr_any(&mp->addr.src.ip6)) {
290 if (nla_put_in6_addr(skb, MDBA_MDB_EATTR_SOURCE,
298 ether_addr_copy(e.addr.u.mac_addr, mp->addr.dst.mac_addr);
301 if (nla_put_u8(skb, MDBA_MDB_EATTR_RTPROT, p->rt_protocol))
303 if (dump_srcs_mode &&
304 (__mdb_fill_srcs(skb, p) ||
305 nla_put_u8(skb, MDBA_MDB_EATTR_GROUP_MODE,
309 nla_nest_end(skb, nest_ent);
314 nla_nest_cancel(skb, nest_ent);
318 static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
319 struct net_device *dev)
321 int idx = 0, s_idx = cb->args[1], err = 0, pidx = 0, s_pidx = cb->args[2];
322 struct net_bridge *br = netdev_priv(dev);
323 struct net_bridge_mdb_entry *mp;
324 struct nlattr *nest, *nest2;
326 if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
329 nest = nla_nest_start_noflag(skb, MDBA_MDB);
333 hlist_for_each_entry_rcu(mp, &br->mdb_list, mdb_node) {
334 struct net_bridge_port_group *p;
335 struct net_bridge_port_group __rcu **pp;
340 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
346 if (!s_pidx && mp->host_joined) {
347 err = __mdb_fill_info(skb, mp, NULL);
349 nla_nest_cancel(skb, nest2);
354 for (pp = &mp->ports; (p = rcu_dereference(*pp)) != NULL;
361 err = __mdb_fill_info(skb, mp, p);
363 nla_nest_end(skb, nest2);
371 nla_nest_end(skb, nest2);
379 nla_nest_end(skb, nest);
383 static int br_mdb_valid_dump_req(const struct nlmsghdr *nlh,
384 struct netlink_ext_ack *extack)
386 struct br_port_msg *bpm;
388 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*bpm))) {
389 NL_SET_ERR_MSG_MOD(extack, "Invalid header for mdb dump request");
393 bpm = nlmsg_data(nlh);
395 NL_SET_ERR_MSG_MOD(extack, "Filtering by device index is not supported for mdb dump request");
398 if (nlmsg_attrlen(nlh, sizeof(*bpm))) {
399 NL_SET_ERR_MSG(extack, "Invalid data after header in mdb dump request");
406 static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
408 struct net_device *dev;
409 struct net *net = sock_net(skb->sk);
410 struct nlmsghdr *nlh = NULL;
413 if (cb->strict_check) {
414 int err = br_mdb_valid_dump_req(cb->nlh, cb->extack);
424 cb->seq = net->dev_base_seq;
426 for_each_netdev_rcu(net, dev) {
427 if (netif_is_bridge_master(dev)) {
428 struct net_bridge *br = netdev_priv(dev);
429 struct br_port_msg *bpm;
434 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
435 cb->nlh->nlmsg_seq, RTM_GETMDB,
436 sizeof(*bpm), NLM_F_MULTI);
440 bpm = nlmsg_data(nlh);
441 memset(bpm, 0, sizeof(*bpm));
442 bpm->ifindex = dev->ifindex;
443 if (br_mdb_fill_info(skb, cb, dev) < 0)
445 if (br_rports_fill_info(skb, &br->multicast_ctx) < 0)
463 static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
464 struct net_device *dev,
465 struct net_bridge_mdb_entry *mp,
466 struct net_bridge_port_group *pg,
469 struct nlmsghdr *nlh;
470 struct br_port_msg *bpm;
471 struct nlattr *nest, *nest2;
473 nlh = nlmsg_put(skb, 0, 0, type, sizeof(*bpm), 0);
477 bpm = nlmsg_data(nlh);
478 memset(bpm, 0, sizeof(*bpm));
479 bpm->family = AF_BRIDGE;
480 bpm->ifindex = dev->ifindex;
481 nest = nla_nest_start_noflag(skb, MDBA_MDB);
484 nest2 = nla_nest_start_noflag(skb, MDBA_MDB_ENTRY);
488 if (__mdb_fill_info(skb, mp, pg))
491 nla_nest_end(skb, nest2);
492 nla_nest_end(skb, nest);
497 nla_nest_end(skb, nest);
499 nlmsg_cancel(skb, nlh);
503 static size_t rtnl_mdb_nlmsg_size(struct net_bridge_port_group *pg)
505 size_t nlmsg_size = NLMSG_ALIGN(sizeof(struct br_port_msg)) +
506 nla_total_size(sizeof(struct br_mdb_entry)) +
507 nla_total_size(sizeof(u32));
508 struct net_bridge_group_src *ent;
509 size_t addr_size = 0;
514 /* MDBA_MDB_EATTR_RTPROT */
515 nlmsg_size += nla_total_size(sizeof(u8));
517 switch (pg->key.addr.proto) {
518 case htons(ETH_P_IP):
519 /* MDBA_MDB_EATTR_SOURCE */
520 if (pg->key.addr.src.ip4)
521 nlmsg_size += nla_total_size(sizeof(__be32));
522 if (pg->key.port->br->multicast_ctx.multicast_igmp_version == 2)
524 addr_size = sizeof(__be32);
526 #if IS_ENABLED(CONFIG_IPV6)
527 case htons(ETH_P_IPV6):
528 /* MDBA_MDB_EATTR_SOURCE */
529 if (!ipv6_addr_any(&pg->key.addr.src.ip6))
530 nlmsg_size += nla_total_size(sizeof(struct in6_addr));
531 if (pg->key.port->br->multicast_ctx.multicast_mld_version == 1)
533 addr_size = sizeof(struct in6_addr);
538 /* MDBA_MDB_EATTR_GROUP_MODE */
539 nlmsg_size += nla_total_size(sizeof(u8));
541 /* MDBA_MDB_EATTR_SRC_LIST nested attr */
542 if (!hlist_empty(&pg->src_list))
543 nlmsg_size += nla_total_size(0);
545 hlist_for_each_entry(ent, &pg->src_list, node) {
546 /* MDBA_MDB_SRCLIST_ENTRY nested attr +
547 * MDBA_MDB_SRCATTR_ADDRESS + MDBA_MDB_SRCATTR_TIMER
549 nlmsg_size += nla_total_size(0) +
550 nla_total_size(addr_size) +
551 nla_total_size(sizeof(u32));
557 void br_mdb_notify(struct net_device *dev,
558 struct net_bridge_mdb_entry *mp,
559 struct net_bridge_port_group *pg,
562 struct net *net = dev_net(dev);
566 br_switchdev_mdb_notify(dev, mp, pg, type);
568 skb = nlmsg_new(rtnl_mdb_nlmsg_size(pg), GFP_ATOMIC);
572 err = nlmsg_populate_mdb_fill(skb, dev, mp, pg, type);
578 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
581 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
584 static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
585 struct net_device *dev,
586 int ifindex, u16 vid, u32 pid,
587 u32 seq, int type, unsigned int flags)
589 struct nlattr *nest, *port_nest;
590 struct br_port_msg *bpm;
591 struct nlmsghdr *nlh;
593 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
597 bpm = nlmsg_data(nlh);
598 memset(bpm, 0, sizeof(*bpm));
599 bpm->family = AF_BRIDGE;
600 bpm->ifindex = dev->ifindex;
601 nest = nla_nest_start_noflag(skb, MDBA_ROUTER);
605 port_nest = nla_nest_start_noflag(skb, MDBA_ROUTER_PORT);
608 if (nla_put_nohdr(skb, sizeof(u32), &ifindex)) {
609 nla_nest_cancel(skb, port_nest);
612 if (vid && nla_put_u16(skb, MDBA_ROUTER_PATTR_VID, vid)) {
613 nla_nest_cancel(skb, port_nest);
616 nla_nest_end(skb, port_nest);
618 nla_nest_end(skb, nest);
623 nla_nest_end(skb, nest);
625 nlmsg_cancel(skb, nlh);
629 static inline size_t rtnl_rtr_nlmsg_size(void)
631 return NLMSG_ALIGN(sizeof(struct br_port_msg))
632 + nla_total_size(sizeof(__u32))
633 + nla_total_size(sizeof(u16));
636 void br_rtr_notify(struct net_device *dev, struct net_bridge_mcast_port *pmctx,
639 struct net *net = dev_net(dev);
645 ifindex = pmctx ? pmctx->port->dev->ifindex : 0;
646 vid = pmctx && br_multicast_port_ctx_is_vlan(pmctx) ? pmctx->vlan->vid :
648 skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
652 err = nlmsg_populate_rtr_fill(skb, dev, ifindex, vid, 0, 0, type,
659 rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
663 rtnl_set_sk_err(net, RTNLGRP_MDB, err);
666 static const struct nla_policy
667 br_mdbe_src_list_entry_pol[MDBE_SRCATTR_MAX + 1] = {
668 [MDBE_SRCATTR_ADDRESS] = NLA_POLICY_RANGE(NLA_BINARY,
669 sizeof(struct in_addr),
670 sizeof(struct in6_addr)),
673 static const struct nla_policy
674 br_mdbe_src_list_pol[MDBE_SRC_LIST_MAX + 1] = {
675 [MDBE_SRC_LIST_ENTRY] = NLA_POLICY_NESTED(br_mdbe_src_list_entry_pol),
678 static const struct nla_policy br_mdbe_attrs_pol[MDBE_ATTR_MAX + 1] = {
679 [MDBE_ATTR_SOURCE] = NLA_POLICY_RANGE(NLA_BINARY,
680 sizeof(struct in_addr),
681 sizeof(struct in6_addr)),
682 [MDBE_ATTR_GROUP_MODE] = NLA_POLICY_RANGE(NLA_U8, MCAST_EXCLUDE,
684 [MDBE_ATTR_SRC_LIST] = NLA_POLICY_NESTED(br_mdbe_src_list_pol),
685 [MDBE_ATTR_RTPROT] = NLA_POLICY_MIN(NLA_U8, RTPROT_STATIC),
688 static bool is_valid_mdb_entry(struct br_mdb_entry *entry,
689 struct netlink_ext_ack *extack)
691 if (entry->ifindex == 0) {
692 NL_SET_ERR_MSG_MOD(extack, "Zero entry ifindex is not allowed");
696 if (entry->addr.proto == htons(ETH_P_IP)) {
697 if (!ipv4_is_multicast(entry->addr.u.ip4)) {
698 NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is not multicast");
701 if (ipv4_is_local_multicast(entry->addr.u.ip4)) {
702 NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is local multicast");
705 #if IS_ENABLED(CONFIG_IPV6)
706 } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
707 if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) {
708 NL_SET_ERR_MSG_MOD(extack, "IPv6 entry group address is link-local all nodes");
712 } else if (entry->addr.proto == 0) {
714 if (!is_multicast_ether_addr(entry->addr.u.mac_addr)) {
715 NL_SET_ERR_MSG_MOD(extack, "L2 entry group is not multicast");
719 NL_SET_ERR_MSG_MOD(extack, "Unknown entry protocol");
723 if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) {
724 NL_SET_ERR_MSG_MOD(extack, "Unknown entry state");
727 if (entry->vid >= VLAN_VID_MASK) {
728 NL_SET_ERR_MSG_MOD(extack, "Invalid entry VLAN id");
735 static bool is_valid_mdb_source(struct nlattr *attr, __be16 proto,
736 struct netlink_ext_ack *extack)
739 case htons(ETH_P_IP):
740 if (nla_len(attr) != sizeof(struct in_addr)) {
741 NL_SET_ERR_MSG_MOD(extack, "IPv4 invalid source address length");
744 if (ipv4_is_multicast(nla_get_in_addr(attr))) {
745 NL_SET_ERR_MSG_MOD(extack, "IPv4 multicast source address is not allowed");
749 #if IS_ENABLED(CONFIG_IPV6)
750 case htons(ETH_P_IPV6): {
753 if (nla_len(attr) != sizeof(struct in6_addr)) {
754 NL_SET_ERR_MSG_MOD(extack, "IPv6 invalid source address length");
757 src = nla_get_in6_addr(attr);
758 if (ipv6_addr_is_multicast(&src)) {
759 NL_SET_ERR_MSG_MOD(extack, "IPv6 multicast source address is not allowed");
766 NL_SET_ERR_MSG_MOD(extack, "Invalid protocol used with source address");
773 static struct net_bridge_mcast *
774 __br_mdb_choose_context(struct net_bridge *br,
775 const struct br_mdb_entry *entry,
776 struct netlink_ext_ack *extack)
778 struct net_bridge_mcast *brmctx = NULL;
779 struct net_bridge_vlan *v;
781 if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
782 brmctx = &br->multicast_ctx;
787 NL_SET_ERR_MSG_MOD(extack, "Cannot add an entry without a vlan when vlan snooping is enabled");
791 v = br_vlan_find(br_vlan_group(br), entry->vid);
793 NL_SET_ERR_MSG_MOD(extack, "Vlan is not configured");
796 if (br_multicast_ctx_vlan_global_disabled(&v->br_mcast_ctx)) {
797 NL_SET_ERR_MSG_MOD(extack, "Vlan's multicast processing is disabled");
800 brmctx = &v->br_mcast_ctx;
805 static int br_mdb_replace_group_sg(const struct br_mdb_config *cfg,
806 struct net_bridge_mdb_entry *mp,
807 struct net_bridge_port_group *pg,
808 struct net_bridge_mcast *brmctx,
811 unsigned long now = jiffies;
814 pg->rt_protocol = cfg->rt_protocol;
815 if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
816 mod_timer(&pg->timer,
817 now + brmctx->multicast_membership_interval);
819 del_timer(&pg->timer);
821 br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB);
826 static int br_mdb_add_group_sg(const struct br_mdb_config *cfg,
827 struct net_bridge_mdb_entry *mp,
828 struct net_bridge_mcast *brmctx,
830 struct netlink_ext_ack *extack)
832 struct net_bridge_port_group __rcu **pp;
833 struct net_bridge_port_group *p;
834 unsigned long now = jiffies;
836 for (pp = &mp->ports;
837 (p = mlock_dereference(*pp, cfg->br)) != NULL;
839 if (p->key.port == cfg->p) {
840 if (!(cfg->nlflags & NLM_F_REPLACE)) {
841 NL_SET_ERR_MSG_MOD(extack, "(S, G) group is already joined by port");
844 return br_mdb_replace_group_sg(cfg, mp, p, brmctx,
847 if ((unsigned long)p->key.port < (unsigned long)cfg->p)
851 p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
852 MCAST_INCLUDE, cfg->rt_protocol);
854 NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new (S, G) port group");
857 rcu_assign_pointer(*pp, p);
858 if (!(flags & MDB_PG_FLAGS_PERMANENT) && !cfg->src_entry)
860 now + brmctx->multicast_membership_interval);
861 br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB);
863 /* All of (*, G) EXCLUDE ports need to be added to the new (S, G) for
864 * proper replication.
866 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto)) {
867 struct net_bridge_mdb_entry *star_mp;
868 struct br_ip star_group;
870 star_group = p->key.addr;
871 memset(&star_group.src, 0, sizeof(star_group.src));
872 star_mp = br_mdb_ip_get(cfg->br, &star_group);
874 br_multicast_sg_add_exclude_ports(star_mp, p);
880 static int br_mdb_add_group_src_fwd(const struct br_mdb_config *cfg,
881 struct br_ip *src_ip,
882 struct net_bridge_mcast *brmctx,
883 struct netlink_ext_ack *extack)
885 struct net_bridge_mdb_entry *sgmp;
886 struct br_mdb_config sg_cfg;
891 sg_ip.src = src_ip->src;
892 sgmp = br_multicast_new_group(cfg->br, &sg_ip);
894 NL_SET_ERR_MSG_MOD(extack, "Failed to add (S, G) MDB entry");
895 return PTR_ERR(sgmp);
898 if (cfg->entry->state == MDB_PERMANENT)
899 flags |= MDB_PG_FLAGS_PERMANENT;
900 if (cfg->filter_mode == MCAST_EXCLUDE)
901 flags |= MDB_PG_FLAGS_BLOCKED;
903 memset(&sg_cfg, 0, sizeof(sg_cfg));
906 sg_cfg.entry = cfg->entry;
907 sg_cfg.group = sg_ip;
908 sg_cfg.src_entry = true;
909 sg_cfg.filter_mode = MCAST_INCLUDE;
910 sg_cfg.rt_protocol = cfg->rt_protocol;
911 sg_cfg.nlflags = cfg->nlflags;
912 return br_mdb_add_group_sg(&sg_cfg, sgmp, brmctx, flags, extack);
915 static int br_mdb_add_group_src(const struct br_mdb_config *cfg,
916 struct net_bridge_port_group *pg,
917 struct net_bridge_mcast *brmctx,
918 struct br_mdb_src_entry *src,
919 struct netlink_ext_ack *extack)
921 struct net_bridge_group_src *ent;
922 unsigned long now = jiffies;
925 ent = br_multicast_find_group_src(pg, &src->addr);
927 ent = br_multicast_new_group_src(pg, &src->addr);
929 NL_SET_ERR_MSG_MOD(extack, "Failed to add new source entry");
932 } else if (!(cfg->nlflags & NLM_F_REPLACE)) {
933 NL_SET_ERR_MSG_MOD(extack, "Source entry already exists");
937 if (cfg->filter_mode == MCAST_INCLUDE &&
938 cfg->entry->state == MDB_TEMPORARY)
939 mod_timer(&ent->timer, now + br_multicast_gmi(brmctx));
941 del_timer(&ent->timer);
943 /* Install a (S, G) forwarding entry for the source. */
944 err = br_mdb_add_group_src_fwd(cfg, &src->addr, brmctx, extack);
948 ent->flags = BR_SGRP_F_INSTALLED | BR_SGRP_F_USER_ADDED;
953 __br_multicast_del_group_src(ent);
957 static void br_mdb_del_group_src(struct net_bridge_port_group *pg,
958 struct br_mdb_src_entry *src)
960 struct net_bridge_group_src *ent;
962 ent = br_multicast_find_group_src(pg, &src->addr);
963 if (WARN_ON_ONCE(!ent))
965 br_multicast_del_group_src(ent, false);
968 static int br_mdb_add_group_srcs(const struct br_mdb_config *cfg,
969 struct net_bridge_port_group *pg,
970 struct net_bridge_mcast *brmctx,
971 struct netlink_ext_ack *extack)
975 for (i = 0; i < cfg->num_src_entries; i++) {
976 err = br_mdb_add_group_src(cfg, pg, brmctx,
977 &cfg->src_entries[i], extack);
979 goto err_del_group_srcs;
985 for (i--; i >= 0; i--)
986 br_mdb_del_group_src(pg, &cfg->src_entries[i]);
990 static int br_mdb_replace_group_srcs(const struct br_mdb_config *cfg,
991 struct net_bridge_port_group *pg,
992 struct net_bridge_mcast *brmctx,
993 struct netlink_ext_ack *extack)
995 struct net_bridge_group_src *ent;
996 struct hlist_node *tmp;
999 hlist_for_each_entry(ent, &pg->src_list, node)
1000 ent->flags |= BR_SGRP_F_DELETE;
1002 err = br_mdb_add_group_srcs(cfg, pg, brmctx, extack);
1004 goto err_clear_delete;
1006 hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node) {
1007 if (ent->flags & BR_SGRP_F_DELETE)
1008 br_multicast_del_group_src(ent, false);
1014 hlist_for_each_entry(ent, &pg->src_list, node)
1015 ent->flags &= ~BR_SGRP_F_DELETE;
1019 static int br_mdb_replace_group_star_g(const struct br_mdb_config *cfg,
1020 struct net_bridge_mdb_entry *mp,
1021 struct net_bridge_port_group *pg,
1022 struct net_bridge_mcast *brmctx,
1023 unsigned char flags,
1024 struct netlink_ext_ack *extack)
1026 unsigned long now = jiffies;
1029 err = br_mdb_replace_group_srcs(cfg, pg, brmctx, extack);
1034 pg->filter_mode = cfg->filter_mode;
1035 pg->rt_protocol = cfg->rt_protocol;
1036 if (!(flags & MDB_PG_FLAGS_PERMANENT) &&
1037 cfg->filter_mode == MCAST_EXCLUDE)
1038 mod_timer(&pg->timer,
1039 now + brmctx->multicast_membership_interval);
1041 del_timer(&pg->timer);
1043 br_mdb_notify(cfg->br->dev, mp, pg, RTM_NEWMDB);
1045 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto))
1046 br_multicast_star_g_handle_mode(pg, cfg->filter_mode);
1051 static int br_mdb_add_group_star_g(const struct br_mdb_config *cfg,
1052 struct net_bridge_mdb_entry *mp,
1053 struct net_bridge_mcast *brmctx,
1054 unsigned char flags,
1055 struct netlink_ext_ack *extack)
1057 struct net_bridge_port_group __rcu **pp;
1058 struct net_bridge_port_group *p;
1059 unsigned long now = jiffies;
1062 for (pp = &mp->ports;
1063 (p = mlock_dereference(*pp, cfg->br)) != NULL;
1065 if (p->key.port == cfg->p) {
1066 if (!(cfg->nlflags & NLM_F_REPLACE)) {
1067 NL_SET_ERR_MSG_MOD(extack, "(*, G) group is already joined by port");
1070 return br_mdb_replace_group_star_g(cfg, mp, p, brmctx,
1073 if ((unsigned long)p->key.port < (unsigned long)cfg->p)
1077 p = br_multicast_new_port_group(cfg->p, &cfg->group, *pp, flags, NULL,
1078 cfg->filter_mode, cfg->rt_protocol);
1080 NL_SET_ERR_MSG_MOD(extack, "Couldn't allocate new (*, G) port group");
1084 err = br_mdb_add_group_srcs(cfg, p, brmctx, extack);
1086 goto err_del_port_group;
1088 rcu_assign_pointer(*pp, p);
1089 if (!(flags & MDB_PG_FLAGS_PERMANENT) &&
1090 cfg->filter_mode == MCAST_EXCLUDE)
1091 mod_timer(&p->timer,
1092 now + brmctx->multicast_membership_interval);
1093 br_mdb_notify(cfg->br->dev, mp, p, RTM_NEWMDB);
1094 /* If we are adding a new EXCLUDE port group (*, G), it needs to be
1095 * also added to all (S, G) entries for proper replication.
1097 if (br_multicast_should_handle_mode(brmctx, cfg->group.proto) &&
1098 cfg->filter_mode == MCAST_EXCLUDE)
1099 br_multicast_star_g_handle_mode(p, MCAST_EXCLUDE);
1104 hlist_del_init(&p->mglist);
1109 static int br_mdb_add_group(const struct br_mdb_config *cfg,
1110 struct netlink_ext_ack *extack)
1112 struct br_mdb_entry *entry = cfg->entry;
1113 struct net_bridge_port *port = cfg->p;
1114 struct net_bridge_mdb_entry *mp;
1115 struct net_bridge *br = cfg->br;
1116 struct net_bridge_mcast *brmctx;
1117 struct br_ip group = cfg->group;
1118 unsigned char flags = 0;
1120 brmctx = __br_mdb_choose_context(br, entry, extack);
1124 mp = br_multicast_new_group(br, &group);
1130 if (mp->host_joined) {
1131 NL_SET_ERR_MSG_MOD(extack, "Group is already joined by host");
1135 br_multicast_host_join(brmctx, mp, false);
1136 br_mdb_notify(br->dev, mp, NULL, RTM_NEWMDB);
1141 if (entry->state == MDB_PERMANENT)
1142 flags |= MDB_PG_FLAGS_PERMANENT;
1144 if (br_multicast_is_star_g(&group))
1145 return br_mdb_add_group_star_g(cfg, mp, brmctx, flags, extack);
1147 return br_mdb_add_group_sg(cfg, mp, brmctx, flags, extack);
1150 static int __br_mdb_add(const struct br_mdb_config *cfg,
1151 struct netlink_ext_ack *extack)
1155 spin_lock_bh(&cfg->br->multicast_lock);
1156 ret = br_mdb_add_group(cfg, extack);
1157 spin_unlock_bh(&cfg->br->multicast_lock);
1162 static int br_mdb_config_src_entry_init(struct nlattr *src_entry,
1163 struct br_mdb_src_entry *src,
1165 struct netlink_ext_ack *extack)
1167 struct nlattr *tb[MDBE_SRCATTR_MAX + 1];
1170 err = nla_parse_nested(tb, MDBE_SRCATTR_MAX, src_entry,
1171 br_mdbe_src_list_entry_pol, extack);
1175 if (NL_REQ_ATTR_CHECK(extack, src_entry, tb, MDBE_SRCATTR_ADDRESS))
1178 if (!is_valid_mdb_source(tb[MDBE_SRCATTR_ADDRESS], proto, extack))
1181 src->addr.proto = proto;
1182 nla_memcpy(&src->addr.src, tb[MDBE_SRCATTR_ADDRESS],
1183 nla_len(tb[MDBE_SRCATTR_ADDRESS]));
1188 static int br_mdb_config_src_list_init(struct nlattr *src_list,
1189 struct br_mdb_config *cfg,
1190 struct netlink_ext_ack *extack)
1192 struct nlattr *src_entry;
1196 nla_for_each_nested(src_entry, src_list, rem)
1197 cfg->num_src_entries++;
1199 if (cfg->num_src_entries >= PG_SRC_ENT_LIMIT) {
1200 NL_SET_ERR_MSG_FMT_MOD(extack, "Exceeded maximum number of source entries (%u)",
1201 PG_SRC_ENT_LIMIT - 1);
1205 cfg->src_entries = kcalloc(cfg->num_src_entries,
1206 sizeof(struct br_mdb_src_entry), GFP_KERNEL);
1207 if (!cfg->src_entries)
1210 nla_for_each_nested(src_entry, src_list, rem) {
1211 err = br_mdb_config_src_entry_init(src_entry,
1212 &cfg->src_entries[i],
1213 cfg->entry->addr.proto,
1216 goto err_src_entry_init;
1223 kfree(cfg->src_entries);
1227 static void br_mdb_config_src_list_fini(struct br_mdb_config *cfg)
1229 kfree(cfg->src_entries);
1232 static int br_mdb_config_attrs_init(struct nlattr *set_attrs,
1233 struct br_mdb_config *cfg,
1234 struct netlink_ext_ack *extack)
1236 struct nlattr *mdb_attrs[MDBE_ATTR_MAX + 1];
1239 err = nla_parse_nested(mdb_attrs, MDBE_ATTR_MAX, set_attrs,
1240 br_mdbe_attrs_pol, extack);
1244 if (mdb_attrs[MDBE_ATTR_SOURCE] &&
1245 !is_valid_mdb_source(mdb_attrs[MDBE_ATTR_SOURCE],
1246 cfg->entry->addr.proto, extack))
1249 __mdb_entry_to_br_ip(cfg->entry, &cfg->group, mdb_attrs);
1251 if (mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
1253 NL_SET_ERR_MSG_MOD(extack, "Filter mode cannot be set for host groups");
1256 if (!br_multicast_is_star_g(&cfg->group)) {
1257 NL_SET_ERR_MSG_MOD(extack, "Filter mode can only be set for (*, G) entries");
1260 cfg->filter_mode = nla_get_u8(mdb_attrs[MDBE_ATTR_GROUP_MODE]);
1262 cfg->filter_mode = MCAST_EXCLUDE;
1265 if (mdb_attrs[MDBE_ATTR_SRC_LIST]) {
1267 NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set for host groups");
1270 if (!br_multicast_is_star_g(&cfg->group)) {
1271 NL_SET_ERR_MSG_MOD(extack, "Source list can only be set for (*, G) entries");
1274 if (!mdb_attrs[MDBE_ATTR_GROUP_MODE]) {
1275 NL_SET_ERR_MSG_MOD(extack, "Source list cannot be set without filter mode");
1278 err = br_mdb_config_src_list_init(mdb_attrs[MDBE_ATTR_SRC_LIST],
1284 if (!cfg->num_src_entries && cfg->filter_mode == MCAST_INCLUDE) {
1285 NL_SET_ERR_MSG_MOD(extack, "Cannot add (*, G) INCLUDE with an empty source list");
1289 if (mdb_attrs[MDBE_ATTR_RTPROT]) {
1291 NL_SET_ERR_MSG_MOD(extack, "Protocol cannot be set for host groups");
1294 cfg->rt_protocol = nla_get_u8(mdb_attrs[MDBE_ATTR_RTPROT]);
1300 static int br_mdb_config_init(struct net *net, const struct nlmsghdr *nlh,
1301 struct br_mdb_config *cfg,
1302 struct netlink_ext_ack *extack)
1304 struct nlattr *tb[MDBA_SET_ENTRY_MAX + 1];
1305 struct br_port_msg *bpm;
1306 struct net_device *dev;
1309 err = nlmsg_parse_deprecated(nlh, sizeof(*bpm), tb,
1310 MDBA_SET_ENTRY_MAX, NULL, extack);
1314 memset(cfg, 0, sizeof(*cfg));
1315 cfg->filter_mode = MCAST_EXCLUDE;
1316 cfg->rt_protocol = RTPROT_STATIC;
1317 cfg->nlflags = nlh->nlmsg_flags;
1319 bpm = nlmsg_data(nlh);
1320 if (!bpm->ifindex) {
1321 NL_SET_ERR_MSG_MOD(extack, "Invalid bridge ifindex");
1325 dev = __dev_get_by_index(net, bpm->ifindex);
1327 NL_SET_ERR_MSG_MOD(extack, "Bridge device doesn't exist");
1331 if (!netif_is_bridge_master(dev)) {
1332 NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge");
1336 cfg->br = netdev_priv(dev);
1338 if (!netif_running(cfg->br->dev)) {
1339 NL_SET_ERR_MSG_MOD(extack, "Bridge device is not running");
1343 if (!br_opt_get(cfg->br, BROPT_MULTICAST_ENABLED)) {
1344 NL_SET_ERR_MSG_MOD(extack, "Bridge's multicast processing is disabled");
1348 if (NL_REQ_ATTR_CHECK(extack, NULL, tb, MDBA_SET_ENTRY)) {
1349 NL_SET_ERR_MSG_MOD(extack, "Missing MDBA_SET_ENTRY attribute");
1352 if (nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
1353 NL_SET_ERR_MSG_MOD(extack, "Invalid MDBA_SET_ENTRY attribute length");
1357 cfg->entry = nla_data(tb[MDBA_SET_ENTRY]);
1358 if (!is_valid_mdb_entry(cfg->entry, extack))
1361 if (cfg->entry->ifindex != cfg->br->dev->ifindex) {
1362 struct net_device *pdev;
1364 pdev = __dev_get_by_index(net, cfg->entry->ifindex);
1366 NL_SET_ERR_MSG_MOD(extack, "Port net device doesn't exist");
1370 cfg->p = br_port_get_rtnl(pdev);
1372 NL_SET_ERR_MSG_MOD(extack, "Net device is not a bridge port");
1376 if (cfg->p->br != cfg->br) {
1377 NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device");
1382 if (tb[MDBA_SET_ENTRY_ATTRS])
1383 return br_mdb_config_attrs_init(tb[MDBA_SET_ENTRY_ATTRS], cfg,
1386 __mdb_entry_to_br_ip(cfg->entry, &cfg->group, NULL);
1391 static void br_mdb_config_fini(struct br_mdb_config *cfg)
1393 br_mdb_config_src_list_fini(cfg);
1396 static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh,
1397 struct netlink_ext_ack *extack)
1399 struct net *net = sock_net(skb->sk);
1400 struct net_bridge_vlan_group *vg;
1401 struct net_bridge_vlan *v;
1402 struct br_mdb_config cfg;
1405 err = br_mdb_config_init(net, nlh, &cfg, extack);
1410 /* host join errors which can happen before creating the group */
1411 if (!cfg.p && !br_group_is_l2(&cfg.group)) {
1412 /* don't allow any flags for host-joined IP groups */
1413 if (cfg.entry->state) {
1414 NL_SET_ERR_MSG_MOD(extack, "Flags are not allowed for host groups");
1417 if (!br_multicast_is_star_g(&cfg.group)) {
1418 NL_SET_ERR_MSG_MOD(extack, "Groups with sources cannot be manually host joined");
1423 if (br_group_is_l2(&cfg.group) && cfg.entry->state != MDB_PERMANENT) {
1424 NL_SET_ERR_MSG_MOD(extack, "Only permanent L2 entries allowed");
1429 if (cfg.p->state == BR_STATE_DISABLED && cfg.entry->state != MDB_PERMANENT) {
1430 NL_SET_ERR_MSG_MOD(extack, "Port is in disabled state and entry is not permanent");
1433 vg = nbp_vlan_group(cfg.p);
1435 vg = br_vlan_group(cfg.br);
1438 /* If vlan filtering is enabled and VLAN is not specified
1439 * install mdb entry on all vlans configured on the port.
1441 if (br_vlan_enabled(cfg.br->dev) && vg && cfg.entry->vid == 0) {
1442 list_for_each_entry(v, &vg->vlan_list, vlist) {
1443 cfg.entry->vid = v->vid;
1444 cfg.group.vid = v->vid;
1445 err = __br_mdb_add(&cfg, extack);
1450 err = __br_mdb_add(&cfg, extack);
1454 br_mdb_config_fini(&cfg);
1458 static int __br_mdb_del(const struct br_mdb_config *cfg)
1460 struct br_mdb_entry *entry = cfg->entry;
1461 struct net_bridge *br = cfg->br;
1462 struct net_bridge_mdb_entry *mp;
1463 struct net_bridge_port_group *p;
1464 struct net_bridge_port_group __rcu **pp;
1465 struct br_ip ip = cfg->group;
1468 spin_lock_bh(&br->multicast_lock);
1469 mp = br_mdb_ip_get(br, &ip);
1474 if (entry->ifindex == mp->br->dev->ifindex && mp->host_joined) {
1475 br_multicast_host_leave(mp, false);
1477 br_mdb_notify(br->dev, mp, NULL, RTM_DELMDB);
1478 if (!mp->ports && netif_running(br->dev))
1479 mod_timer(&mp->timer, jiffies);
1483 for (pp = &mp->ports;
1484 (p = mlock_dereference(*pp, br)) != NULL;
1486 if (!p->key.port || p->key.port->dev->ifindex != entry->ifindex)
1489 br_multicast_del_pg(mp, p, pp);
1495 spin_unlock_bh(&br->multicast_lock);
1499 static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh,
1500 struct netlink_ext_ack *extack)
1502 struct net *net = sock_net(skb->sk);
1503 struct net_bridge_vlan_group *vg;
1504 struct net_bridge_vlan *v;
1505 struct br_mdb_config cfg;
1508 err = br_mdb_config_init(net, nlh, &cfg, extack);
1513 vg = nbp_vlan_group(cfg.p);
1515 vg = br_vlan_group(cfg.br);
1517 /* If vlan filtering is enabled and VLAN is not specified
1518 * delete mdb entry on all vlans configured on the port.
1520 if (br_vlan_enabled(cfg.br->dev) && vg && cfg.entry->vid == 0) {
1521 list_for_each_entry(v, &vg->vlan_list, vlist) {
1522 cfg.entry->vid = v->vid;
1523 cfg.group.vid = v->vid;
1524 err = __br_mdb_del(&cfg);
1527 err = __br_mdb_del(&cfg);
1530 br_mdb_config_fini(&cfg);
1534 void br_mdb_init(void)
1536 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, 0);
1537 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, 0);
1538 rtnl_register_module(THIS_MODULE, PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, 0);
1541 void br_mdb_uninit(void)
1543 rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
1544 rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
1545 rtnl_unregister(PF_BRIDGE, RTM_DELMDB);