1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Bridge multicast support.
   4 *
   5 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
 
 
 
 
 
 
   6 */
   7
   8#include <linux/err.h>
   9#include <linux/export.h>
  10#include <linux/if_ether.h>
  11#include <linux/igmp.h>
  12#include <linux/in.h>
  13#include <linux/jhash.h>
  14#include <linux/kernel.h>
  15#include <linux/log2.h>
  16#include <linux/netdevice.h>
  17#include <linux/netfilter_bridge.h>
  18#include <linux/random.h>
  19#include <linux/rculist.h>
  20#include <linux/skbuff.h>
  21#include <linux/slab.h>
  22#include <linux/timer.h>
  23#include <linux/inetdevice.h>
  24#include <linux/mroute.h>
  25#include <net/ip.h>
  26#include <net/switchdev.h>
  27#if IS_ENABLED(CONFIG_IPV6)
  28#include <linux/icmpv6.h>
  29#include <net/ipv6.h>
  30#include <net/mld.h>
  31#include <net/ip6_checksum.h>
  32#include <net/addrconf.h>
 
  33#endif
  34
  35#include "br_private.h"
  36
  37static const struct rhashtable_params br_mdb_rht_params = {
  38	.head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
  39	.key_offset = offsetof(struct net_bridge_mdb_entry, addr),
  40	.key_len = sizeof(struct br_ip),
  41	.automatic_shrinking = true,
  42};
  43
  44static void br_multicast_start_querier(struct net_bridge *br,
  45				       struct bridge_mcast_own_query *query);
  46static void br_multicast_add_router(struct net_bridge *br,
  47				    struct net_bridge_port *port);
  48static void br_ip4_multicast_leave_group(struct net_bridge *br,
  49					 struct net_bridge_port *port,
  50					 __be32 group,
  51					 __u16 vid,
  52					 const unsigned char *src);
  53
  54static void __del_port_router(struct net_bridge_port *p);
  55#if IS_ENABLED(CONFIG_IPV6)
  56static void br_ip6_multicast_leave_group(struct net_bridge *br,
  57					 struct net_bridge_port *port,
  58					 const struct in6_addr *group,
  59					 __u16 vid, const unsigned char *src);
 
 
 
 
  60#endif
 
 
 
  61
  62static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
  63						      struct br_ip *dst)
  64{
  65	return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
  66}
  67
  68struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
  69					   struct br_ip *dst)
 
  70{
  71	struct net_bridge_mdb_entry *ent;
 
 
  72
  73	lockdep_assert_held_once(&br->multicast_lock);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  74
  75	rcu_read_lock();
  76	ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
  77	rcu_read_unlock();
 
 
  78
  79	return ent;
  80}
  81
  82static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
  83						   __be32 dst, __u16 vid)
  84{
  85	struct br_ip br_dst;
  86
  87	memset(&br_dst, 0, sizeof(br_dst));
  88	br_dst.u.ip4 = dst;
  89	br_dst.proto = htons(ETH_P_IP);
  90	br_dst.vid = vid;
  91
  92	return br_mdb_ip_get(br, &br_dst);
  93}
  94
  95#if IS_ENABLED(CONFIG_IPV6)
  96static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
  97						   const struct in6_addr *dst,
  98						   __u16 vid)
  99{
 100	struct br_ip br_dst;
 101
 102	memset(&br_dst, 0, sizeof(br_dst));
 103	br_dst.u.ip6 = *dst;
 104	br_dst.proto = htons(ETH_P_IPV6);
 105	br_dst.vid = vid;
 106
 107	return br_mdb_ip_get(br, &br_dst);
 108}
 109#endif
 110
 111struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 112					struct sk_buff *skb, u16 vid)
 113{
 
 114	struct br_ip ip;
 115
 116	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
 117		return NULL;
 118
 119	if (BR_INPUT_SKB_CB(skb)->igmp)
 120		return NULL;
 121
 122	memset(&ip, 0, sizeof(ip));
 123	ip.proto = skb->protocol;
 124	ip.vid = vid;
 125
 126	switch (skb->protocol) {
 127	case htons(ETH_P_IP):
 128		ip.u.ip4 = ip_hdr(skb)->daddr;
 129		break;
 130#if IS_ENABLED(CONFIG_IPV6)
 131	case htons(ETH_P_IPV6):
 132		ip.u.ip6 = ipv6_hdr(skb)->daddr;
 133		break;
 134#endif
 135	default:
 136		return NULL;
 137	}
 138
 139	return br_mdb_ip_get_rcu(br, &ip);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 140}
 141
 142static void br_multicast_group_expired(struct timer_list *t)
 143{
 144	struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 145	struct net_bridge *br = mp->br;
 
 146
 147	spin_lock(&br->multicast_lock);
 148	if (!netif_running(br->dev) || timer_pending(&mp->timer))
 149		goto out;
 150
 151	br_multicast_host_leave(mp, true);
 152
 153	if (mp->ports)
 154		goto out;
 155
 156	rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
 157			       br_mdb_rht_params);
 158	hlist_del_rcu(&mp->mdb_node);
 
 159
 160	kfree_rcu(mp, rcu);
 
 161
 162out:
 163	spin_unlock(&br->multicast_lock);
 164}
 165
 166static void br_multicast_del_pg(struct net_bridge *br,
 167				struct net_bridge_port_group *pg)
 168{
 
 169	struct net_bridge_mdb_entry *mp;
 170	struct net_bridge_port_group *p;
 171	struct net_bridge_port_group __rcu **pp;
 172
 173	mp = br_mdb_ip_get(br, &pg->addr);
 
 
 174	if (WARN_ON(!mp))
 175		return;
 176
 177	for (pp = &mp->ports;
 178	     (p = mlock_dereference(*pp, br)) != NULL;
 179	     pp = &p->next) {
 180		if (p != pg)
 181			continue;
 182
 183		rcu_assign_pointer(*pp, p->next);
 184		hlist_del_init(&p->mglist);
 185		del_timer(&p->timer);
 186		br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 187			      p->flags);
 188		kfree_rcu(p, rcu);
 189
 190		if (!mp->ports && !mp->host_joined &&
 191		    netif_running(br->dev))
 192			mod_timer(&mp->timer, jiffies);
 193
 194		return;
 195	}
 196
 197	WARN_ON(1);
 198}
 199
 200static void br_multicast_port_group_expired(struct timer_list *t)
 201{
 202	struct net_bridge_port_group *pg = from_timer(pg, t, timer);
 203	struct net_bridge *br = pg->port->br;
 204
 205	spin_lock(&br->multicast_lock);
 206	if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 207	    hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 208		goto out;
 209
 210	br_multicast_del_pg(br, pg);
 211
 212out:
 213	spin_unlock(&br->multicast_lock);
 214}
 215
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 216static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 217						    __be32 group,
 218						    u8 *igmp_type)
 219{
 220	struct igmpv3_query *ihv3;
 221	size_t igmp_hdr_size;
 222	struct sk_buff *skb;
 223	struct igmphdr *ih;
 224	struct ethhdr *eth;
 225	struct iphdr *iph;
 226
 227	igmp_hdr_size = sizeof(*ih);
 228	if (br->multicast_igmp_version == 3)
 229		igmp_hdr_size = sizeof(*ihv3);
 230	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 231						 igmp_hdr_size + 4);
 232	if (!skb)
 233		goto out;
 234
 235	skb->protocol = htons(ETH_P_IP);
 236
 237	skb_reset_mac_header(skb);
 238	eth = eth_hdr(skb);
 239
 240	ether_addr_copy(eth->h_source, br->dev->dev_addr);
 241	eth->h_dest[0] = 1;
 242	eth->h_dest[1] = 0;
 243	eth->h_dest[2] = 0x5e;
 244	eth->h_dest[3] = 0;
 245	eth->h_dest[4] = 0;
 246	eth->h_dest[5] = 1;
 247	eth->h_proto = htons(ETH_P_IP);
 248	skb_put(skb, sizeof(*eth));
 249
 250	skb_set_network_header(skb, skb->len);
 251	iph = ip_hdr(skb);
 252
 253	iph->version = 4;
 254	iph->ihl = 6;
 255	iph->tos = 0xc0;
 256	iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
 257	iph->id = 0;
 258	iph->frag_off = htons(IP_DF);
 259	iph->ttl = 1;
 260	iph->protocol = IPPROTO_IGMP;
 261	iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
 262		     inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 263	iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 264	((u8 *)&iph[1])[0] = IPOPT_RA;
 265	((u8 *)&iph[1])[1] = 4;
 266	((u8 *)&iph[1])[2] = 0;
 267	((u8 *)&iph[1])[3] = 0;
 268	ip_send_check(iph);
 269	skb_put(skb, 24);
 270
 271	skb_set_transport_header(skb, skb->len);
 272	*igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
 273
 274	switch (br->multicast_igmp_version) {
 275	case 2:
 276		ih = igmp_hdr(skb);
 277		ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 278		ih->code = (group ? br->multicast_last_member_interval :
 279				    br->multicast_query_response_interval) /
 280			   (HZ / IGMP_TIMER_SCALE);
 281		ih->group = group;
 282		ih->csum = 0;
 283		ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
 284		break;
 285	case 3:
 286		ihv3 = igmpv3_query_hdr(skb);
 287		ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
 288		ihv3->code = (group ? br->multicast_last_member_interval :
 289				      br->multicast_query_response_interval) /
 290			     (HZ / IGMP_TIMER_SCALE);
 291		ihv3->group = group;
 292		ihv3->qqic = br->multicast_query_interval / HZ;
 293		ihv3->nsrcs = 0;
 294		ihv3->resv = 0;
 295		ihv3->suppress = 0;
 296		ihv3->qrv = 2;
 297		ihv3->csum = 0;
 298		ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
 299		break;
 300	}
 301
 302	skb_put(skb, igmp_hdr_size);
 303	__skb_pull(skb, sizeof(*eth));
 304
 305out:
 306	return skb;
 307}
 308
 309#if IS_ENABLED(CONFIG_IPV6)
 310static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 311						    const struct in6_addr *grp,
 312						    u8 *igmp_type)
 313{
 314	struct mld2_query *mld2q;
 315	unsigned long interval;
 316	struct ipv6hdr *ip6h;
 317	struct mld_msg *mldq;
 318	size_t mld_hdr_size;
 319	struct sk_buff *skb;
 320	struct ethhdr *eth;
 321	u8 *hopopt;
 
 322
 323	mld_hdr_size = sizeof(*mldq);
 324	if (br->multicast_mld_version == 2)
 325		mld_hdr_size = sizeof(*mld2q);
 326	skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 327						 8 + mld_hdr_size);
 328	if (!skb)
 329		goto out;
 330
 331	skb->protocol = htons(ETH_P_IPV6);
 332
 333	/* Ethernet header */
 334	skb_reset_mac_header(skb);
 335	eth = eth_hdr(skb);
 336
 337	ether_addr_copy(eth->h_source, br->dev->dev_addr);
 338	eth->h_proto = htons(ETH_P_IPV6);
 339	skb_put(skb, sizeof(*eth));
 340
 341	/* IPv6 header + HbH option */
 342	skb_set_network_header(skb, skb->len);
 343	ip6h = ipv6_hdr(skb);
 344
 345	*(__force __be32 *)ip6h = htonl(0x60000000);
 346	ip6h->payload_len = htons(8 + mld_hdr_size);
 347	ip6h->nexthdr = IPPROTO_HOPOPTS;
 348	ip6h->hop_limit = 1;
 349	ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 350	if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 351			       &ip6h->saddr)) {
 352		kfree_skb(skb);
 353		br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
 354		return NULL;
 355	}
 356
 357	br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
 358	ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 359
 360	hopopt = (u8 *)(ip6h + 1);
 361	hopopt[0] = IPPROTO_ICMPV6;		/* next hdr */
 362	hopopt[1] = 0;				/* length of HbH */
 363	hopopt[2] = IPV6_TLV_ROUTERALERT;	/* Router Alert */
 364	hopopt[3] = 2;				/* Length of RA Option */
 365	hopopt[4] = 0;				/* Type = 0x0000 (MLD) */
 366	hopopt[5] = 0;
 367	hopopt[6] = IPV6_TLV_PAD1;		/* Pad1 */
 368	hopopt[7] = IPV6_TLV_PAD1;		/* Pad1 */
 369
 370	skb_put(skb, sizeof(*ip6h) + 8);
 371
 372	/* ICMPv6 */
 373	skb_set_transport_header(skb, skb->len);
 374	interval = ipv6_addr_any(grp) ?
 375			br->multicast_query_response_interval :
 376			br->multicast_last_member_interval;
 377	*igmp_type = ICMPV6_MGM_QUERY;
 378	switch (br->multicast_mld_version) {
 379	case 1:
 380		mldq = (struct mld_msg *)icmp6_hdr(skb);
 381		mldq->mld_type = ICMPV6_MGM_QUERY;
 382		mldq->mld_code = 0;
 383		mldq->mld_cksum = 0;
 384		mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 385		mldq->mld_reserved = 0;
 386		mldq->mld_mca = *grp;
 387		mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 388						  sizeof(*mldq), IPPROTO_ICMPV6,
 389						  csum_partial(mldq,
 390							       sizeof(*mldq),
 391							       0));
 392		break;
 393	case 2:
 394		mld2q = (struct mld2_query *)icmp6_hdr(skb);
 395		mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
 396		mld2q->mld2q_type = ICMPV6_MGM_QUERY;
 397		mld2q->mld2q_code = 0;
 398		mld2q->mld2q_cksum = 0;
 399		mld2q->mld2q_resv1 = 0;
 400		mld2q->mld2q_resv2 = 0;
 401		mld2q->mld2q_suppress = 0;
 402		mld2q->mld2q_qrv = 2;
 403		mld2q->mld2q_nsrcs = 0;
 404		mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
 405		mld2q->mld2q_mca = *grp;
 406		mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 407						     sizeof(*mld2q),
 408						     IPPROTO_ICMPV6,
 409						     csum_partial(mld2q,
 410								  sizeof(*mld2q),
 411								  0));
 412		break;
 413	}
 414	skb_put(skb, mld_hdr_size);
 415
 416	__skb_pull(skb, sizeof(*eth));
 417
 418out:
 419	return skb;
 420}
 421#endif
 422
 423static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 424						struct br_ip *addr,
 425						u8 *igmp_type)
 426{
 427	switch (addr->proto) {
 428	case htons(ETH_P_IP):
 429		return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
 430#if IS_ENABLED(CONFIG_IPV6)
 431	case htons(ETH_P_IPV6):
 432		return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
 433						    igmp_type);
 434#endif
 435	}
 436	return NULL;
 437}
 438
 439struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 440						    struct br_ip *group)
 441{
 442	struct net_bridge_mdb_entry *mp;
 443	int err;
 444
 445	mp = br_mdb_ip_get(br, group);
 446	if (mp)
 447		return mp;
 448
 449	if (atomic_read(&br->mdb_hash_tbl.nelems) >= br->hash_max) {
 450		br_opt_toggle(br, BROPT_MULTICAST_ENABLED, false);
 451		return ERR_PTR(-E2BIG);
 452	}
 453
 454	mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 455	if (unlikely(!mp))
 456		return ERR_PTR(-ENOMEM);
 457
 458	mp->br = br;
 459	mp->addr = *group;
 460	timer_setup(&mp->timer, br_multicast_group_expired, 0);
 461	err = rhashtable_lookup_insert_fast(&br->mdb_hash_tbl, &mp->rhnode,
 462					    br_mdb_rht_params);
 463	if (err) {
 464		kfree(mp);
 465		mp = ERR_PTR(err);
 466	} else {
 467		hlist_add_head_rcu(&mp->mdb_node, &br->mdb_list);
 468	}
 469
 470	return mp;
 471}
 472
 473struct net_bridge_port_group *br_multicast_new_port_group(
 474			struct net_bridge_port *port,
 475			struct br_ip *group,
 476			struct net_bridge_port_group __rcu *next,
 477			unsigned char flags,
 478			const unsigned char *src)
 479{
 480	struct net_bridge_port_group *p;
 
 481
 482	p = kzalloc(sizeof(*p), GFP_ATOMIC);
 483	if (unlikely(!p))
 484		return NULL;
 
 485
 486	p->addr = *group;
 487	p->port = port;
 488	p->flags = flags;
 489	rcu_assign_pointer(p->next, next);
 490	hlist_add_head(&p->mglist, &port->mglist);
 491	timer_setup(&p->timer, br_multicast_port_group_expired, 0);
 492
 493	if (src)
 494		memcpy(p->eth_addr, src, ETH_ALEN);
 495	else
 496		eth_broadcast_addr(p->eth_addr);
 
 
 
 
 
 
 
 
 
 497
 498	return p;
 
 
 
 
 
 499}
 500
 501static bool br_port_group_equal(struct net_bridge_port_group *p,
 502				struct net_bridge_port *port,
 503				const unsigned char *src)
 504{
 505	if (p->port != port)
 506		return false;
 
 
 
 
 
 
 507
 508	if (!(port->flags & BR_MULTICAST_TO_UNICAST))
 509		return true;
 510
 511	return ether_addr_equal(src, p->eth_addr);
 
 512}
 513
 514void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify)
 
 
 515{
 516	if (!mp->host_joined) {
 517		mp->host_joined = true;
 518		if (notify)
 519			br_mdb_notify(mp->br->dev, NULL, &mp->addr,
 520				      RTM_NEWMDB, 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 521	}
 522	mod_timer(&mp->timer, jiffies + mp->br->multicast_membership_interval);
 
 
 
 
 
 523}
 524
 525void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify)
 
 
 526{
 527	if (!mp->host_joined)
 528		return;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 529
 530	mp->host_joined = false;
 531	if (notify)
 532		br_mdb_notify(mp->br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
 
 
 
 
 
 
 
 
 
 533}
 534
 535static int br_multicast_add_group(struct net_bridge *br,
 536				  struct net_bridge_port *port,
 537				  struct br_ip *group,
 538				  const unsigned char *src)
 539{
 540	struct net_bridge_port_group __rcu **pp;
 541	struct net_bridge_port_group *p;
 542	struct net_bridge_mdb_entry *mp;
 
 
 543	unsigned long now = jiffies;
 544	int err;
 545
 546	spin_lock(&br->multicast_lock);
 547	if (!netif_running(br->dev) ||
 548	    (port && port->state == BR_STATE_DISABLED))
 549		goto out;
 550
 551	mp = br_multicast_new_group(br, group);
 552	err = PTR_ERR(mp);
 553	if (IS_ERR(mp))
 554		goto err;
 555
 556	if (!port) {
 557		br_multicast_host_join(mp, true);
 
 558		goto out;
 559	}
 560
 561	for (pp = &mp->ports;
 562	     (p = mlock_dereference(*pp, br)) != NULL;
 563	     pp = &p->next) {
 564		if (br_port_group_equal(p, port, src))
 565			goto found;
 566		if ((unsigned long)p->port < (unsigned long)port)
 567			break;
 568	}
 569
 570	p = br_multicast_new_port_group(port, group, *pp, 0, src);
 
 571	if (unlikely(!p))
 572		goto err;
 
 
 
 
 
 
 
 
 
 
 573	rcu_assign_pointer(*pp, p);
 574	br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 575
 576found:
 577	mod_timer(&p->timer, now + br->multicast_membership_interval);
 578out:
 579	err = 0;
 580
 581err:
 582	spin_unlock(&br->multicast_lock);
 583	return err;
 584}
 585
 586static int br_ip4_multicast_add_group(struct net_bridge *br,
 587				      struct net_bridge_port *port,
 588				      __be32 group,
 589				      __u16 vid,
 590				      const unsigned char *src)
 591{
 592	struct br_ip br_group;
 593
 594	if (ipv4_is_local_multicast(group))
 595		return 0;
 596
 597	memset(&br_group, 0, sizeof(br_group));
 598	br_group.u.ip4 = group;
 599	br_group.proto = htons(ETH_P_IP);
 600	br_group.vid = vid;
 601
 602	return br_multicast_add_group(br, port, &br_group, src);
 603}
 604
 605#if IS_ENABLED(CONFIG_IPV6)
 606static int br_ip6_multicast_add_group(struct net_bridge *br,
 607				      struct net_bridge_port *port,
 608				      const struct in6_addr *group,
 609				      __u16 vid,
 610				      const unsigned char *src)
 611{
 612	struct br_ip br_group;
 613
 614	if (ipv6_addr_is_ll_all_nodes(group))
 615		return 0;
 616
 617	memset(&br_group, 0, sizeof(br_group));
 618	br_group.u.ip6 = *group;
 619	br_group.proto = htons(ETH_P_IPV6);
 620	br_group.vid = vid;
 621
 622	return br_multicast_add_group(br, port, &br_group, src);
 623}
 624#endif
 625
 626static void br_multicast_router_expired(struct timer_list *t)
 627{
 628	struct net_bridge_port *port =
 629			from_timer(port, t, multicast_router_timer);
 630	struct net_bridge *br = port->br;
 631
 632	spin_lock(&br->multicast_lock);
 633	if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 634	    port->multicast_router == MDB_RTR_TYPE_PERM ||
 635	    timer_pending(&port->multicast_router_timer))
 636		goto out;
 637
 638	__del_port_router(port);
 639out:
 640	spin_unlock(&br->multicast_lock);
 641}
 642
 643static void br_mc_router_state_change(struct net_bridge *p,
 644				      bool is_mc_router)
 645{
 646	struct switchdev_attr attr = {
 647		.orig_dev = p->dev,
 648		.id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
 649		.flags = SWITCHDEV_F_DEFER,
 650		.u.mrouter = is_mc_router,
 651	};
 652
 653	switchdev_port_attr_set(p->dev, &attr);
 654}
 655
 656static void br_multicast_local_router_expired(struct timer_list *t)
 657{
 658	struct net_bridge *br = from_timer(br, t, multicast_router_timer);
 659
 660	spin_lock(&br->multicast_lock);
 661	if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
 662	    br->multicast_router == MDB_RTR_TYPE_PERM ||
 663	    timer_pending(&br->multicast_router_timer))
 664		goto out;
 665
 666	br_mc_router_state_change(br, false);
 667out:
 668	spin_unlock(&br->multicast_lock);
 669}
 670
 671static void br_multicast_querier_expired(struct net_bridge *br,
 672					 struct bridge_mcast_own_query *query)
 673{
 674	spin_lock(&br->multicast_lock);
 675	if (!netif_running(br->dev) || !br_opt_get(br, BROPT_MULTICAST_ENABLED))
 676		goto out;
 677
 678	br_multicast_start_querier(br, query);
 679
 680out:
 681	spin_unlock(&br->multicast_lock);
 682}
 683
 684static void br_ip4_multicast_querier_expired(struct timer_list *t)
 685{
 686	struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
 687
 688	br_multicast_querier_expired(br, &br->ip4_own_query);
 689}
 690
 691#if IS_ENABLED(CONFIG_IPV6)
 692static void br_ip6_multicast_querier_expired(struct timer_list *t)
 693{
 694	struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
 695
 696	br_multicast_querier_expired(br, &br->ip6_own_query);
 697}
 698#endif
 699
 700static void br_multicast_select_own_querier(struct net_bridge *br,
 701					    struct br_ip *ip,
 702					    struct sk_buff *skb)
 703{
 704	if (ip->proto == htons(ETH_P_IP))
 705		br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 706#if IS_ENABLED(CONFIG_IPV6)
 707	else
 708		br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 709#endif
 710}
 711
 712static void __br_multicast_send_query(struct net_bridge *br,
 713				      struct net_bridge_port *port,
 714				      struct br_ip *ip)
 715{
 716	struct sk_buff *skb;
 717	u8 igmp_type;
 718
 719	skb = br_multicast_alloc_query(br, ip, &igmp_type);
 720	if (!skb)
 721		return;
 722
 723	if (port) {
 
 724		skb->dev = port->dev;
 725		br_multicast_count(br, port, skb, igmp_type,
 726				   BR_MCAST_DIR_TX);
 727		NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 728			dev_net(port->dev), NULL, skb, NULL, skb->dev,
 729			br_dev_queue_push_xmit);
 730	} else {
 731		br_multicast_select_own_querier(br, ip, skb);
 732		br_multicast_count(br, port, skb, igmp_type,
 733				   BR_MCAST_DIR_RX);
 734		netif_rx(skb);
 735	}
 736}
 737
 738static void br_multicast_send_query(struct net_bridge *br,
 739				    struct net_bridge_port *port,
 740				    struct bridge_mcast_own_query *own_query)
 741{
 742	struct bridge_mcast_other_query *other_query = NULL;
 743	struct br_ip br_group;
 744	unsigned long time;
 
 745
 746	if (!netif_running(br->dev) ||
 747	    !br_opt_get(br, BROPT_MULTICAST_ENABLED) ||
 748	    !br_opt_get(br, BROPT_MULTICAST_QUERIER))
 749		return;
 750
 751	memset(&br_group.u, 0, sizeof(br_group.u));
 752
 753	if (port ? (own_query == &port->ip4_own_query) :
 754		   (own_query == &br->ip4_own_query)) {
 755		other_query = &br->ip4_other_query;
 756		br_group.proto = htons(ETH_P_IP);
 757#if IS_ENABLED(CONFIG_IPV6)
 758	} else {
 759		other_query = &br->ip6_other_query;
 760		br_group.proto = htons(ETH_P_IPV6);
 761#endif
 762	}
 763
 764	if (!other_query || timer_pending(&other_query->timer))
 765		return;
 766
 
 
 767	__br_multicast_send_query(br, port, &br_group);
 
 768
 769	time = jiffies;
 770	time += own_query->startup_sent < br->multicast_startup_query_count ?
 771		br->multicast_startup_query_interval :
 772		br->multicast_query_interval;
 773	mod_timer(&own_query->timer, time);
 
 774}
 775
 776static void
 777br_multicast_port_query_expired(struct net_bridge_port *port,
 778				struct bridge_mcast_own_query *query)
 779{
 
 780	struct net_bridge *br = port->br;
 781
 782	spin_lock(&br->multicast_lock);
 783	if (port->state == BR_STATE_DISABLED ||
 784	    port->state == BR_STATE_BLOCKING)
 785		goto out;
 786
 787	if (query->startup_sent < br->multicast_startup_query_count)
 788		query->startup_sent++;
 
 789
 790	br_multicast_send_query(port->br, port, query);
 
 791
 792out:
 793	spin_unlock(&br->multicast_lock);
 794}
 795
 796static void br_ip4_multicast_port_query_expired(struct timer_list *t)
 797{
 798	struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
 799
 800	br_multicast_port_query_expired(port, &port->ip4_own_query);
 801}
 802
 803#if IS_ENABLED(CONFIG_IPV6)
 804static void br_ip6_multicast_port_query_expired(struct timer_list *t)
 805{
 806	struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
 807
 808	br_multicast_port_query_expired(port, &port->ip6_own_query);
 809}
 810#endif
 811
 812static void br_mc_disabled_update(struct net_device *dev, bool value)
 813{
 814	struct switchdev_attr attr = {
 815		.orig_dev = dev,
 816		.id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
 817		.flags = SWITCHDEV_F_DEFER,
 818		.u.mc_disabled = !value,
 819	};
 820
 821	switchdev_port_attr_set(dev, &attr);
 822}
 823
 824int br_multicast_add_port(struct net_bridge_port *port)
 825{
 826	port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
 827
 828	timer_setup(&port->multicast_router_timer,
 829		    br_multicast_router_expired, 0);
 830	timer_setup(&port->ip4_own_query.timer,
 831		    br_ip4_multicast_port_query_expired, 0);
 832#if IS_ENABLED(CONFIG_IPV6)
 833	timer_setup(&port->ip6_own_query.timer,
 834		    br_ip6_multicast_port_query_expired, 0);
 835#endif
 836	br_mc_disabled_update(port->dev,
 837			      br_opt_get(port->br, BROPT_MULTICAST_ENABLED));
 838
 839	port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
 840	if (!port->mcast_stats)
 841		return -ENOMEM;
 842
 843	return 0;
 844}
 845
 846void br_multicast_del_port(struct net_bridge_port *port)
 847{
 848	struct net_bridge *br = port->br;
 849	struct net_bridge_port_group *pg;
 850	struct hlist_node *n;
 851
 852	/* Take care of the remaining groups, only perm ones should be left */
 853	spin_lock_bh(&br->multicast_lock);
 854	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 855		br_multicast_del_pg(br, pg);
 856	spin_unlock_bh(&br->multicast_lock);
 857	del_timer_sync(&port->multicast_router_timer);
 858	free_percpu(port->mcast_stats);
 859}
 860
 861static void br_multicast_enable(struct bridge_mcast_own_query *query)
 862{
 863	query->startup_sent = 0;
 864
 865	if (try_to_del_timer_sync(&query->timer) >= 0 ||
 866	    del_timer(&query->timer))
 867		mod_timer(&query->timer, jiffies);
 868}
 869
 870static void __br_multicast_enable_port(struct net_bridge_port *port)
 871{
 872	struct net_bridge *br = port->br;
 873
 874	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED) || !netif_running(br->dev))
 875		return;
 876
 877	br_multicast_enable(&port->ip4_own_query);
 878#if IS_ENABLED(CONFIG_IPV6)
 879	br_multicast_enable(&port->ip6_own_query);
 880#endif
 881	if (port->multicast_router == MDB_RTR_TYPE_PERM &&
 882	    hlist_unhashed(&port->rlist))
 883		br_multicast_add_router(br, port);
 884}
 885
 886void br_multicast_enable_port(struct net_bridge_port *port)
 887{
 888	struct net_bridge *br = port->br;
 889
 890	spin_lock(&br->multicast_lock);
 
 
 
 891	__br_multicast_enable_port(port);
 
 
 892	spin_unlock(&br->multicast_lock);
 893}
 894
 895void br_multicast_disable_port(struct net_bridge_port *port)
 896{
 897	struct net_bridge *br = port->br;
 898	struct net_bridge_port_group *pg;
 899	struct hlist_node *n;
 900
 901	spin_lock(&br->multicast_lock);
 902	hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
 903		if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
 904			br_multicast_del_pg(br, pg);
 905
 906	__del_port_router(port);
 907
 
 
 908	del_timer(&port->multicast_router_timer);
 909	del_timer(&port->ip4_own_query.timer);
 910#if IS_ENABLED(CONFIG_IPV6)
 911	del_timer(&port->ip6_own_query.timer);
 912#endif
 913	spin_unlock(&br->multicast_lock);
 914}
 915
 916static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
 917					 struct net_bridge_port *port,
 918					 struct sk_buff *skb,
 919					 u16 vid)
 920{
 921	const unsigned char *src;
 922	struct igmpv3_report *ih;
 923	struct igmpv3_grec *grec;
 924	int i;
 925	int len;
 926	int num;
 927	int type;
 928	int err = 0;
 929	__be32 group;
 930	u16 nsrcs;
 
 
 931
 932	ih = igmpv3_report_hdr(skb);
 933	num = ntohs(ih->ngrec);
 934	len = skb_transport_offset(skb) + sizeof(*ih);
 935
 936	for (i = 0; i < num; i++) {
 937		len += sizeof(*grec);
 938		if (!ip_mc_may_pull(skb, len))
 939			return -EINVAL;
 940
 941		grec = (void *)(skb->data + len - sizeof(*grec));
 942		group = grec->grec_mca;
 943		type = grec->grec_type;
 944		nsrcs = ntohs(grec->grec_nsrcs);
 945
 946		len += nsrcs * 4;
 947		if (!ip_mc_may_pull(skb, len))
 948			return -EINVAL;
 949
 950		/* We treat this as an IGMPv2 report for now. */
 951		switch (type) {
 952		case IGMPV3_MODE_IS_INCLUDE:
 953		case IGMPV3_MODE_IS_EXCLUDE:
 954		case IGMPV3_CHANGE_TO_INCLUDE:
 955		case IGMPV3_CHANGE_TO_EXCLUDE:
 956		case IGMPV3_ALLOW_NEW_SOURCES:
 957		case IGMPV3_BLOCK_OLD_SOURCES:
 958			break;
 959
 960		default:
 961			continue;
 962		}
 963
 964		src = eth_hdr(skb)->h_source;
 965		if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
 966		     type == IGMPV3_MODE_IS_INCLUDE) &&
 967		    nsrcs == 0) {
 968			br_ip4_multicast_leave_group(br, port, group, vid, src);
 969		} else {
 970			err = br_ip4_multicast_add_group(br, port, group, vid,
 971							 src);
 972			if (err)
 973				break;
 974		}
 975	}
 976
 977	return err;
 978}
 979
 980#if IS_ENABLED(CONFIG_IPV6)
 981static int br_ip6_multicast_mld2_report(struct net_bridge *br,
 982					struct net_bridge_port *port,
 983					struct sk_buff *skb,
 984					u16 vid)
 985{
 986	unsigned int nsrcs_offset;
 987	const unsigned char *src;
 988	struct icmp6hdr *icmp6h;
 989	struct mld2_grec *grec;
 990	unsigned int grec_len;
 991	int i;
 992	int len;
 993	int num;
 994	int err = 0;
 995
 996	if (!ipv6_mc_may_pull(skb, sizeof(*icmp6h)))
 997		return -EINVAL;
 998
 999	icmp6h = icmp6_hdr(skb);
1000	num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1001	len = skb_transport_offset(skb) + sizeof(*icmp6h);
1002
1003	for (i = 0; i < num; i++) {
1004		__be16 *_nsrcs, __nsrcs;
1005		u16 nsrcs;
1006
1007		nsrcs_offset = len + offsetof(struct mld2_grec, grec_nsrcs);
1008
1009		if (skb_transport_offset(skb) + ipv6_transport_len(skb) <
1010		    nsrcs_offset + sizeof(_nsrcs))
 
1011			return -EINVAL;
1012
1013		_nsrcs = skb_header_pointer(skb, nsrcs_offset,
1014					    sizeof(__nsrcs), &__nsrcs);
1015		if (!_nsrcs)
1016			return -EINVAL;
1017
1018		nsrcs = ntohs(*_nsrcs);
1019		grec_len = struct_size(grec, grec_src, nsrcs);
1020
1021		if (!ipv6_mc_may_pull(skb, len + grec_len))
1022			return -EINVAL;
1023
1024		grec = (struct mld2_grec *)(skb->data + len);
1025		len += grec_len;
 
1026
1027		/* We treat these as MLDv1 reports for now. */
1028		switch (grec->grec_type) {
1029		case MLD2_MODE_IS_INCLUDE:
1030		case MLD2_MODE_IS_EXCLUDE:
1031		case MLD2_CHANGE_TO_INCLUDE:
1032		case MLD2_CHANGE_TO_EXCLUDE:
1033		case MLD2_ALLOW_NEW_SOURCES:
1034		case MLD2_BLOCK_OLD_SOURCES:
1035			break;
1036
1037		default:
1038			continue;
1039		}
1040
1041		src = eth_hdr(skb)->h_source;
1042		if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1043		     grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1044		    nsrcs == 0) {
1045			br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1046						     vid, src);
1047		} else {
1048			err = br_ip6_multicast_add_group(br, port,
1049							 &grec->grec_mca, vid,
1050							 src);
1051			if (err)
1052				break;
1053		}
1054	}
1055
1056	return err;
1057}
1058#endif
1059
1060static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1061					    struct net_bridge_port *port,
1062					    __be32 saddr)
1063{
1064	if (!timer_pending(&br->ip4_own_query.timer) &&
1065	    !timer_pending(&br->ip4_other_query.timer))
1066		goto update;
1067
1068	if (!br->ip4_querier.addr.u.ip4)
1069		goto update;
1070
1071	if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1072		goto update;
1073
1074	return false;
1075
1076update:
1077	br->ip4_querier.addr.u.ip4 = saddr;
1078
1079	/* update protected by general multicast_lock by caller */
1080	rcu_assign_pointer(br->ip4_querier.port, port);
1081
1082	return true;
1083}
1084
1085#if IS_ENABLED(CONFIG_IPV6)
1086static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1087					    struct net_bridge_port *port,
1088					    struct in6_addr *saddr)
1089{
1090	if (!timer_pending(&br->ip6_own_query.timer) &&
1091	    !timer_pending(&br->ip6_other_query.timer))
1092		goto update;
1093
1094	if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1095		goto update;
1096
1097	return false;
1098
1099update:
1100	br->ip6_querier.addr.u.ip6 = *saddr;
1101
1102	/* update protected by general multicast_lock by caller */
1103	rcu_assign_pointer(br->ip6_querier.port, port);
1104
1105	return true;
1106}
1107#endif
1108
1109static bool br_multicast_select_querier(struct net_bridge *br,
1110					struct net_bridge_port *port,
1111					struct br_ip *saddr)
1112{
1113	switch (saddr->proto) {
1114	case htons(ETH_P_IP):
1115		return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1116#if IS_ENABLED(CONFIG_IPV6)
1117	case htons(ETH_P_IPV6):
1118		return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1119#endif
1120	}
1121
1122	return false;
1123}
1124
1125static void
1126br_multicast_update_query_timer(struct net_bridge *br,
1127				struct bridge_mcast_other_query *query,
1128				unsigned long max_delay)
1129{
1130	if (!timer_pending(&query->timer))
1131		query->delay_time = jiffies + max_delay;
1132
1133	mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1134}
1135
1136static void br_port_mc_router_state_change(struct net_bridge_port *p,
1137					   bool is_mc_router)
1138{
1139	struct switchdev_attr attr = {
1140		.orig_dev = p->dev,
1141		.id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1142		.flags = SWITCHDEV_F_DEFER,
1143		.u.mrouter = is_mc_router,
1144	};
1145
1146	switchdev_port_attr_set(p->dev, &attr);
1147}
1148
1149/*
1150 * Add port to router_list
1151 *  list is maintained ordered by pointer value
1152 *  and locked by br->multicast_lock and RCU
1153 */
1154static void br_multicast_add_router(struct net_bridge *br,
1155				    struct net_bridge_port *port)
1156{
1157	struct net_bridge_port *p;
1158	struct hlist_node *slot = NULL;
1159
1160	if (!hlist_unhashed(&port->rlist))
1161		return;
1162
1163	hlist_for_each_entry(p, &br->router_list, rlist) {
1164		if ((unsigned long) port >= (unsigned long) p)
1165			break;
1166		slot = &p->rlist;
1167	}
1168
1169	if (slot)
1170		hlist_add_behind_rcu(&port->rlist, slot);
1171	else
1172		hlist_add_head_rcu(&port->rlist, &br->router_list);
1173	br_rtr_notify(br->dev, port, RTM_NEWMDB);
1174	br_port_mc_router_state_change(port, true);
1175}
1176
1177static void br_multicast_mark_router(struct net_bridge *br,
1178				     struct net_bridge_port *port)
1179{
1180	unsigned long now = jiffies;
1181
1182	if (!port) {
1183		if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1184			if (!timer_pending(&br->multicast_router_timer))
1185				br_mc_router_state_change(br, true);
1186			mod_timer(&br->multicast_router_timer,
1187				  now + br->multicast_querier_interval);
1188		}
1189		return;
1190	}
1191
1192	if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1193	    port->multicast_router == MDB_RTR_TYPE_PERM)
1194		return;
1195
 
 
 
1196	br_multicast_add_router(br, port);
1197
 
1198	mod_timer(&port->multicast_router_timer,
1199		  now + br->multicast_querier_interval);
1200}
1201
1202static void br_multicast_query_received(struct net_bridge *br,
1203					struct net_bridge_port *port,
1204					struct bridge_mcast_other_query *query,
1205					struct br_ip *saddr,
1206					unsigned long max_delay)
1207{
1208	if (!br_multicast_select_querier(br, port, saddr))
 
 
 
1209		return;
1210
1211	br_multicast_update_query_timer(br, query, max_delay);
1212	br_multicast_mark_router(br, port);
1213}
1214
1215static void br_ip4_multicast_query(struct net_bridge *br,
1216				   struct net_bridge_port *port,
1217				   struct sk_buff *skb,
1218				   u16 vid)
1219{
1220	unsigned int transport_len = ip_transport_len(skb);
1221	const struct iphdr *iph = ip_hdr(skb);
1222	struct igmphdr *ih = igmp_hdr(skb);
1223	struct net_bridge_mdb_entry *mp;
1224	struct igmpv3_query *ih3;
1225	struct net_bridge_port_group *p;
1226	struct net_bridge_port_group __rcu **pp;
1227	struct br_ip saddr;
1228	unsigned long max_delay;
1229	unsigned long now = jiffies;
1230	__be32 group;
 
1231
1232	spin_lock(&br->multicast_lock);
1233	if (!netif_running(br->dev) ||
1234	    (port && port->state == BR_STATE_DISABLED))
1235		goto out;
1236
 
 
1237	group = ih->group;
1238
1239	if (transport_len == sizeof(*ih)) {
1240		max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1241
1242		if (!max_delay) {
1243			max_delay = 10 * HZ;
1244			group = 0;
1245		}
1246	} else if (transport_len >= sizeof(*ih3)) {
 
 
 
 
 
1247		ih3 = igmpv3_query_hdr(skb);
1248		if (ih3->nsrcs)
1249			goto out;
1250
1251		max_delay = ih3->code ?
1252			    IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1253	} else {
1254		goto out;
1255	}
1256
1257	if (!group) {
1258		saddr.proto = htons(ETH_P_IP);
1259		saddr.u.ip4 = iph->saddr;
1260
1261		br_multicast_query_received(br, port, &br->ip4_other_query,
1262					    &saddr, max_delay);
1263		goto out;
1264	}
1265
1266	mp = br_mdb_ip4_get(br, group, vid);
1267	if (!mp)
1268		goto out;
1269
1270	max_delay *= br->multicast_last_member_count;
1271
1272	if (mp->host_joined &&
1273	    (timer_pending(&mp->timer) ?
1274	     time_after(mp->timer.expires, now + max_delay) :
1275	     try_to_del_timer_sync(&mp->timer) >= 0))
1276		mod_timer(&mp->timer, now + max_delay);
1277
1278	for (pp = &mp->ports;
1279	     (p = mlock_dereference(*pp, br)) != NULL;
1280	     pp = &p->next) {
1281		if (timer_pending(&p->timer) ?
1282		    time_after(p->timer.expires, now + max_delay) :
1283		    try_to_del_timer_sync(&p->timer) >= 0)
1284			mod_timer(&p->timer, now + max_delay);
1285	}
1286
1287out:
1288	spin_unlock(&br->multicast_lock);
 
1289}
1290
1291#if IS_ENABLED(CONFIG_IPV6)
1292static int br_ip6_multicast_query(struct net_bridge *br,
1293				  struct net_bridge_port *port,
1294				  struct sk_buff *skb,
1295				  u16 vid)
1296{
1297	unsigned int transport_len = ipv6_transport_len(skb);
1298	struct mld_msg *mld;
1299	struct net_bridge_mdb_entry *mp;
1300	struct mld2_query *mld2q;
1301	struct net_bridge_port_group *p;
1302	struct net_bridge_port_group __rcu **pp;
1303	struct br_ip saddr;
1304	unsigned long max_delay;
1305	unsigned long now = jiffies;
1306	unsigned int offset = skb_transport_offset(skb);
1307	const struct in6_addr *group = NULL;
1308	bool is_general_query;
1309	int err = 0;
1310
1311	spin_lock(&br->multicast_lock);
1312	if (!netif_running(br->dev) ||
1313	    (port && port->state == BR_STATE_DISABLED))
1314		goto out;
1315
1316	if (transport_len == sizeof(*mld)) {
1317		if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
 
 
1318			err = -EINVAL;
1319			goto out;
1320		}
1321		mld = (struct mld_msg *) icmp6_hdr(skb);
1322		max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1323		if (max_delay)
1324			group = &mld->mld_mca;
1325	} else {
1326		if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1327			err = -EINVAL;
1328			goto out;
1329		}
1330		mld2q = (struct mld2_query *)icmp6_hdr(skb);
1331		if (!mld2q->mld2q_nsrcs)
1332			group = &mld2q->mld2q_mca;
1333
1334		max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1335	}
1336
1337	is_general_query = group && ipv6_addr_any(group);
1338
1339	if (is_general_query) {
1340		saddr.proto = htons(ETH_P_IPV6);
1341		saddr.u.ip6 = ipv6_hdr(skb)->saddr;
1342
1343		br_multicast_query_received(br, port, &br->ip6_other_query,
1344					    &saddr, max_delay);
1345		goto out;
1346	} else if (!group) {
1347		goto out;
1348	}
1349
1350	mp = br_mdb_ip6_get(br, group, vid);
1351	if (!mp)
1352		goto out;
1353
1354	max_delay *= br->multicast_last_member_count;
1355	if (mp->host_joined &&
1356	    (timer_pending(&mp->timer) ?
1357	     time_after(mp->timer.expires, now + max_delay) :
1358	     try_to_del_timer_sync(&mp->timer) >= 0))
1359		mod_timer(&mp->timer, now + max_delay);
1360
1361	for (pp = &mp->ports;
1362	     (p = mlock_dereference(*pp, br)) != NULL;
1363	     pp = &p->next) {
1364		if (timer_pending(&p->timer) ?
1365		    time_after(p->timer.expires, now + max_delay) :
1366		    try_to_del_timer_sync(&p->timer) >= 0)
1367			mod_timer(&p->timer, now + max_delay);
1368	}
1369
1370out:
1371	spin_unlock(&br->multicast_lock);
1372	return err;
1373}
1374#endif
1375
1376static void
1377br_multicast_leave_group(struct net_bridge *br,
1378			 struct net_bridge_port *port,
1379			 struct br_ip *group,
1380			 struct bridge_mcast_other_query *other_query,
1381			 struct bridge_mcast_own_query *own_query,
1382			 const unsigned char *src)
1383{
 
1384	struct net_bridge_mdb_entry *mp;
1385	struct net_bridge_port_group *p;
1386	unsigned long now;
1387	unsigned long time;
1388
1389	spin_lock(&br->multicast_lock);
1390	if (!netif_running(br->dev) ||
1391	    (port && port->state == BR_STATE_DISABLED))
 
1392		goto out;
1393
1394	mp = br_mdb_ip_get(br, group);
 
1395	if (!mp)
1396		goto out;
1397
1398	if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1399		struct net_bridge_port_group __rcu **pp;
1400
1401		for (pp = &mp->ports;
1402		     (p = mlock_dereference(*pp, br)) != NULL;
1403		     pp = &p->next) {
1404			if (!br_port_group_equal(p, port, src))
1405				continue;
1406
1407			if (p->flags & MDB_PG_FLAGS_PERMANENT)
1408				break;
1409
1410			rcu_assign_pointer(*pp, p->next);
1411			hlist_del_init(&p->mglist);
1412			del_timer(&p->timer);
1413			kfree_rcu(p, rcu);
1414			br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1415				      p->flags | MDB_PG_FLAGS_FAST_LEAVE);
1416
1417			if (!mp->ports && !mp->host_joined &&
1418			    netif_running(br->dev))
1419				mod_timer(&mp->timer, jiffies);
1420		}
1421		goto out;
1422	}
1423
1424	if (timer_pending(&other_query->timer))
1425		goto out;
1426
1427	if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
1428		__br_multicast_send_query(br, port, &mp->addr);
1429
1430		time = jiffies + br->multicast_last_member_count *
1431				 br->multicast_last_member_interval;
1432
1433		mod_timer(&own_query->timer, time);
1434
1435		for (p = mlock_dereference(mp->ports, br);
1436		     p != NULL;
1437		     p = mlock_dereference(p->next, br)) {
1438			if (!br_port_group_equal(p, port, src))
1439				continue;
1440
1441			if (!hlist_unhashed(&p->mglist) &&
1442			    (timer_pending(&p->timer) ?
1443			     time_after(p->timer.expires, time) :
1444			     try_to_del_timer_sync(&p->timer) >= 0)) {
1445				mod_timer(&p->timer, time);
1446			}
1447
1448			break;
1449		}
1450	}
1451
1452	now = jiffies;
1453	time = now + br->multicast_last_member_count *
1454		     br->multicast_last_member_interval;
1455
1456	if (!port) {
1457		if (mp->host_joined &&
1458		    (timer_pending(&mp->timer) ?
1459		     time_after(mp->timer.expires, time) :
1460		     try_to_del_timer_sync(&mp->timer) >= 0)) {
1461			mod_timer(&mp->timer, time);
 
 
 
1462		}
1463
1464		goto out;
1465	}
1466
1467	for (p = mlock_dereference(mp->ports, br);
1468	     p != NULL;
1469	     p = mlock_dereference(p->next, br)) {
1470		if (p->port != port)
1471			continue;
1472
1473		if (!hlist_unhashed(&p->mglist) &&
1474		    (timer_pending(&p->timer) ?
1475		     time_after(p->timer.expires, time) :
1476		     try_to_del_timer_sync(&p->timer) >= 0)) {
1477			mod_timer(&p->timer, time);
 
 
 
1478		}
1479
1480		break;
1481	}
 
1482out:
1483	spin_unlock(&br->multicast_lock);
1484}
1485
1486static void br_ip4_multicast_leave_group(struct net_bridge *br,
1487					 struct net_bridge_port *port,
1488					 __be32 group,
1489					 __u16 vid,
1490					 const unsigned char *src)
1491{
1492	struct br_ip br_group;
1493	struct bridge_mcast_own_query *own_query;
1494
1495	if (ipv4_is_local_multicast(group))
1496		return;
1497
1498	own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1499
1500	memset(&br_group, 0, sizeof(br_group));
1501	br_group.u.ip4 = group;
1502	br_group.proto = htons(ETH_P_IP);
1503	br_group.vid = vid;
1504
1505	br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1506				 own_query, src);
1507}
1508
1509#if IS_ENABLED(CONFIG_IPV6)
1510static void br_ip6_multicast_leave_group(struct net_bridge *br,
1511					 struct net_bridge_port *port,
1512					 const struct in6_addr *group,
1513					 __u16 vid,
1514					 const unsigned char *src)
1515{
1516	struct br_ip br_group;
1517	struct bridge_mcast_own_query *own_query;
1518
1519	if (ipv6_addr_is_ll_all_nodes(group))
1520		return;
1521
1522	own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1523
1524	memset(&br_group, 0, sizeof(br_group));
1525	br_group.u.ip6 = *group;
1526	br_group.proto = htons(ETH_P_IPV6);
1527	br_group.vid = vid;
1528
1529	br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1530				 own_query, src);
1531}
1532#endif
1533
1534static void br_multicast_err_count(const struct net_bridge *br,
1535				   const struct net_bridge_port *p,
1536				   __be16 proto)
1537{
1538	struct bridge_mcast_stats __percpu *stats;
1539	struct bridge_mcast_stats *pstats;
1540
1541	if (!br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
1542		return;
 
1543
1544	if (p)
1545		stats = p->mcast_stats;
1546	else
1547		stats = br->mcast_stats;
1548	if (WARN_ON(!stats))
1549		return;
1550
1551	pstats = this_cpu_ptr(stats);
1552
1553	u64_stats_update_begin(&pstats->syncp);
1554	switch (proto) {
1555	case htons(ETH_P_IP):
1556		pstats->mstats.igmp_parse_errors++;
1557		break;
1558#if IS_ENABLED(CONFIG_IPV6)
1559	case htons(ETH_P_IPV6):
1560		pstats->mstats.mld_parse_errors++;
1561		break;
1562#endif
1563	}
1564	u64_stats_update_end(&pstats->syncp);
1565}
1566
1567static void br_multicast_pim(struct net_bridge *br,
1568			     struct net_bridge_port *port,
1569			     const struct sk_buff *skb)
1570{
1571	unsigned int offset = skb_transport_offset(skb);
1572	struct pimhdr *pimhdr, _pimhdr;
1573
1574	pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1575	if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1576	    pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1577		return;
1578
1579	br_multicast_mark_router(br, port);
1580}
1581
1582static int br_ip4_multicast_mrd_rcv(struct net_bridge *br,
1583				    struct net_bridge_port *port,
1584				    struct sk_buff *skb)
1585{
1586	if (ip_hdr(skb)->protocol != IPPROTO_IGMP ||
1587	    igmp_hdr(skb)->type != IGMP_MRDISC_ADV)
1588		return -ENOMSG;
1589
1590	br_multicast_mark_router(br, port);
 
 
1591
1592	return 0;
1593}
 
 
1594
1595static int br_multicast_ipv4_rcv(struct net_bridge *br,
1596				 struct net_bridge_port *port,
1597				 struct sk_buff *skb,
1598				 u16 vid)
1599{
1600	const unsigned char *src;
1601	struct igmphdr *ih;
1602	int err;
1603
1604	err = ip_mc_check_igmp(skb);
 
 
 
1605
1606	if (err == -ENOMSG) {
1607		if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1608			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1609		} else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1610			if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1611				br_multicast_pim(br, port, skb);
1612		} else if (ipv4_is_all_snoopers(ip_hdr(skb)->daddr)) {
1613			br_ip4_multicast_mrd_rcv(br, port, skb);
1614		}
1615
1616		return 0;
1617	} else if (err < 0) {
1618		br_multicast_err_count(br, port, skb->protocol);
1619		return err;
 
 
 
 
 
1620	}
1621
1622	ih = igmp_hdr(skb);
1623	src = eth_hdr(skb)->h_source;
1624	BR_INPUT_SKB_CB(skb)->igmp = ih->type;
 
1625
1626	switch (ih->type) {
1627	case IGMP_HOST_MEMBERSHIP_REPORT:
1628	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1629		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1630		err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1631		break;
1632	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1633		err = br_ip4_multicast_igmp3_report(br, port, skb, vid);
1634		break;
1635	case IGMP_HOST_MEMBERSHIP_QUERY:
1636		br_ip4_multicast_query(br, port, skb, vid);
1637		break;
1638	case IGMP_HOST_LEAVE_MESSAGE:
1639		br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1640		break;
1641	}
1642
1643	br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1644			   BR_MCAST_DIR_RX);
1645
 
 
1646	return err;
1647}
1648
1649#if IS_ENABLED(CONFIG_IPV6)
1650static int br_ip6_multicast_mrd_rcv(struct net_bridge *br,
1651				    struct net_bridge_port *port,
1652				    struct sk_buff *skb)
1653{
1654	int ret;
1655
1656	if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
1657		return -ENOMSG;
1658
1659	ret = ipv6_mc_check_icmpv6(skb);
1660	if (ret < 0)
1661		return ret;
1662
1663	if (icmp6_hdr(skb)->icmp6_type != ICMPV6_MRDISC_ADV)
1664		return -ENOMSG;
1665
1666	br_multicast_mark_router(br, port);
1667
1668	return 0;
1669}
1670
1671static int br_multicast_ipv6_rcv(struct net_bridge *br,
1672				 struct net_bridge_port *port,
1673				 struct sk_buff *skb,
1674				 u16 vid)
1675{
1676	const unsigned char *src;
1677	struct mld_msg *mld;
 
 
 
 
1678	int err;
1679
1680	err = ipv6_mc_check_mld(skb);
 
1681
1682	if (err == -ENOMSG) {
1683		if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1684			BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1685
1686		if (ipv6_addr_is_all_snoopers(&ipv6_hdr(skb)->daddr)) {
1687			err = br_ip6_multicast_mrd_rcv(br, port, skb);
 
 
 
 
 
 
 
 
1688
1689			if (err < 0 && err != -ENOMSG) {
1690				br_multicast_err_count(br, port, skb->protocol);
1691				return err;
1692			}
1693		}
 
1694
 
1695		return 0;
1696	} else if (err < 0) {
1697		br_multicast_err_count(br, port, skb->protocol);
1698		return err;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1699	}
1700
1701	mld = (struct mld_msg *)skb_transport_header(skb);
1702	BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1703
1704	switch (mld->mld_type) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1705	case ICMPV6_MGM_REPORT:
1706		src = eth_hdr(skb)->h_source;
 
 
 
 
 
 
1707		BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1708		err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1709						 src);
1710		break;
 
1711	case ICMPV6_MLD2_REPORT:
1712		err = br_ip6_multicast_mld2_report(br, port, skb, vid);
1713		break;
1714	case ICMPV6_MGM_QUERY:
1715		err = br_ip6_multicast_query(br, port, skb, vid);
1716		break;
1717	case ICMPV6_MGM_REDUCTION:
1718		src = eth_hdr(skb)->h_source;
1719		br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1720		break;
 
 
 
 
 
 
1721	}
1722
1723	br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1724			   BR_MCAST_DIR_RX);
1725
1726	return err;
1727}
1728#endif
1729
1730int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1731		     struct sk_buff *skb, u16 vid)
1732{
1733	int ret = 0;
1734
1735	BR_INPUT_SKB_CB(skb)->igmp = 0;
1736	BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1737
1738	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1739		return 0;
1740
1741	switch (skb->protocol) {
1742	case htons(ETH_P_IP):
1743		ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1744		break;
1745#if IS_ENABLED(CONFIG_IPV6)
1746	case htons(ETH_P_IPV6):
1747		ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1748		break;
1749#endif
1750	}
1751
1752	return ret;
1753}
1754
1755static void br_multicast_query_expired(struct net_bridge *br,
1756				       struct bridge_mcast_own_query *query,
1757				       struct bridge_mcast_querier *querier)
1758{
1759	spin_lock(&br->multicast_lock);
1760	if (query->startup_sent < br->multicast_startup_query_count)
1761		query->startup_sent++;
1762
1763	RCU_INIT_POINTER(querier->port, NULL);
1764	br_multicast_send_query(br, NULL, query);
1765	spin_unlock(&br->multicast_lock);
1766}
1767
1768static void br_ip4_multicast_query_expired(struct timer_list *t)
1769{
1770	struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1771
1772	br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1773}
 
 
1774
1775#if IS_ENABLED(CONFIG_IPV6)
1776static void br_ip6_multicast_query_expired(struct timer_list *t)
1777{
1778	struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1779
1780	br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1781}
1782#endif
1783
1784void br_multicast_init(struct net_bridge *br)
1785{
1786	br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
 
1787
1788	br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1789	br->multicast_last_member_count = 2;
1790	br->multicast_startup_query_count = 2;
1791
1792	br->multicast_last_member_interval = HZ;
1793	br->multicast_query_response_interval = 10 * HZ;
1794	br->multicast_startup_query_interval = 125 * HZ / 4;
1795	br->multicast_query_interval = 125 * HZ;
1796	br->multicast_querier_interval = 255 * HZ;
1797	br->multicast_membership_interval = 260 * HZ;
1798
1799	br->ip4_other_query.delay_time = 0;
1800	br->ip4_querier.port = NULL;
1801	br->multicast_igmp_version = 2;
1802#if IS_ENABLED(CONFIG_IPV6)
1803	br->multicast_mld_version = 1;
1804	br->ip6_other_query.delay_time = 0;
1805	br->ip6_querier.port = NULL;
1806#endif
1807	br_opt_toggle(br, BROPT_MULTICAST_ENABLED, true);
1808	br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
1809
1810	spin_lock_init(&br->multicast_lock);
1811	timer_setup(&br->multicast_router_timer,
1812		    br_multicast_local_router_expired, 0);
1813	timer_setup(&br->ip4_other_query.timer,
1814		    br_ip4_multicast_querier_expired, 0);
1815	timer_setup(&br->ip4_own_query.timer,
1816		    br_ip4_multicast_query_expired, 0);
1817#if IS_ENABLED(CONFIG_IPV6)
1818	timer_setup(&br->ip6_other_query.timer,
1819		    br_ip6_multicast_querier_expired, 0);
1820	timer_setup(&br->ip6_own_query.timer,
1821		    br_ip6_multicast_query_expired, 0);
1822#endif
1823	INIT_HLIST_HEAD(&br->mdb_list);
1824}
1825
1826static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
1827{
1828	struct in_device *in_dev = in_dev_get(br->dev);
1829
1830	if (!in_dev)
1831		return;
1832
1833	__ip_mc_inc_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1834	in_dev_put(in_dev);
1835}
1836
1837#if IS_ENABLED(CONFIG_IPV6)
1838static void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1839{
1840	struct in6_addr addr;
1841
1842	ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1843	ipv6_dev_mc_inc(br->dev, &addr);
1844}
1845#else
1846static inline void br_ip6_multicast_join_snoopers(struct net_bridge *br)
1847{
1848}
1849#endif
1850
1851static void br_multicast_join_snoopers(struct net_bridge *br)
1852{
1853	br_ip4_multicast_join_snoopers(br);
1854	br_ip6_multicast_join_snoopers(br);
1855}
1856
1857static void br_ip4_multicast_leave_snoopers(struct net_bridge *br)
1858{
1859	struct in_device *in_dev = in_dev_get(br->dev);
1860
1861	if (WARN_ON(!in_dev))
1862		return;
1863
1864	__ip_mc_dec_group(in_dev, htonl(INADDR_ALLSNOOPERS_GROUP), GFP_ATOMIC);
1865	in_dev_put(in_dev);
1866}
1867
1868#if IS_ENABLED(CONFIG_IPV6)
1869static void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1870{
1871	struct in6_addr addr;
1872
1873	ipv6_addr_set(&addr, htonl(0xff020000), 0, 0, htonl(0x6a));
1874	ipv6_dev_mc_dec(br->dev, &addr);
1875}
1876#else
1877static inline void br_ip6_multicast_leave_snoopers(struct net_bridge *br)
1878{
1879}
1880#endif
1881
1882static void br_multicast_leave_snoopers(struct net_bridge *br)
1883{
1884	br_ip4_multicast_leave_snoopers(br);
1885	br_ip6_multicast_leave_snoopers(br);
1886}
1887
1888static void __br_multicast_open(struct net_bridge *br,
1889				struct bridge_mcast_own_query *query)
1890{
1891	query->startup_sent = 0;
 
 
 
 
1892
1893	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
1894		return;
 
1895
1896	mod_timer(&query->timer, jiffies);
1897}
 
 
1898
1899void br_multicast_open(struct net_bridge *br)
1900{
1901	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1902		br_multicast_join_snoopers(br);
1903
1904	__br_multicast_open(br, &br->ip4_own_query);
1905#if IS_ENABLED(CONFIG_IPV6)
1906	__br_multicast_open(br, &br->ip6_own_query);
1907#endif
1908}
1909
1910void br_multicast_stop(struct net_bridge *br)
1911{
1912	del_timer_sync(&br->multicast_router_timer);
1913	del_timer_sync(&br->ip4_other_query.timer);
1914	del_timer_sync(&br->ip4_own_query.timer);
1915#if IS_ENABLED(CONFIG_IPV6)
1916	del_timer_sync(&br->ip6_other_query.timer);
1917	del_timer_sync(&br->ip6_own_query.timer);
1918#endif
1919
1920	if (br_opt_get(br, BROPT_MULTICAST_ENABLED))
1921		br_multicast_leave_snoopers(br);
1922}
 
 
 
1923
1924void br_multicast_dev_del(struct net_bridge *br)
1925{
1926	struct net_bridge_mdb_entry *mp;
1927	struct hlist_node *tmp;
1928
1929	spin_lock_bh(&br->multicast_lock);
1930	hlist_for_each_entry_safe(mp, tmp, &br->mdb_list, mdb_node) {
1931		del_timer(&mp->timer);
1932		rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
1933				       br_mdb_rht_params);
1934		hlist_del_rcu(&mp->mdb_node);
1935		kfree_rcu(mp, rcu);
1936	}
1937	spin_unlock_bh(&br->multicast_lock);
1938
1939	rcu_barrier();
1940}
1941
1942int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1943{
1944	int err = -EINVAL;
1945
1946	spin_lock_bh(&br->multicast_lock);
 
 
1947
1948	switch (val) {
1949	case MDB_RTR_TYPE_DISABLED:
1950	case MDB_RTR_TYPE_PERM:
1951		br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
1952		del_timer(&br->multicast_router_timer);
 
 
1953		br->multicast_router = val;
1954		err = 0;
1955		break;
1956	case MDB_RTR_TYPE_TEMP_QUERY:
1957		if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
1958			br_mc_router_state_change(br, false);
1959		br->multicast_router = val;
1960		err = 0;
1961		break;
1962	}
1963
 
1964	spin_unlock_bh(&br->multicast_lock);
1965
1966	return err;
1967}
1968
1969static void __del_port_router(struct net_bridge_port *p)
1970{
1971	if (hlist_unhashed(&p->rlist))
1972		return;
1973	hlist_del_init_rcu(&p->rlist);
1974	br_rtr_notify(p->br->dev, p, RTM_DELMDB);
1975	br_port_mc_router_state_change(p, false);
1976
1977	/* don't allow timer refresh */
1978	if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1979		p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1980}
1981
1982int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1983{
1984	struct net_bridge *br = p->br;
1985	unsigned long now = jiffies;
1986	int err = -EINVAL;
1987
1988	spin_lock(&br->multicast_lock);
1989	if (p->multicast_router == val) {
1990		/* Refresh the temp router port timer */
1991		if (p->multicast_router == MDB_RTR_TYPE_TEMP)
1992			mod_timer(&p->multicast_router_timer,
1993				  now + br->multicast_querier_interval);
1994		err = 0;
1995		goto unlock;
1996	}
1997	switch (val) {
1998	case MDB_RTR_TYPE_DISABLED:
1999		p->multicast_router = MDB_RTR_TYPE_DISABLED;
2000		__del_port_router(p);
2001		del_timer(&p->multicast_router_timer);
2002		break;
2003	case MDB_RTR_TYPE_TEMP_QUERY:
2004		p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2005		__del_port_router(p);
2006		break;
2007	case MDB_RTR_TYPE_PERM:
2008		p->multicast_router = MDB_RTR_TYPE_PERM;
 
2009		del_timer(&p->multicast_router_timer);
 
 
 
 
2010		br_multicast_add_router(br, p);
2011		break;
2012	case MDB_RTR_TYPE_TEMP:
2013		p->multicast_router = MDB_RTR_TYPE_TEMP;
2014		br_multicast_mark_router(br, p);
2015		break;
2016	default:
2017		goto unlock;
 
2018	}
2019	err = 0;
2020unlock:
2021	spin_unlock(&br->multicast_lock);
2022
2023	return err;
2024}
2025
2026static void br_multicast_start_querier(struct net_bridge *br,
2027				       struct bridge_mcast_own_query *query)
2028{
2029	struct net_bridge_port *port;
2030
2031	__br_multicast_open(br, query);
2032
2033	rcu_read_lock();
2034	list_for_each_entry_rcu(port, &br->port_list, list) {
2035		if (port->state == BR_STATE_DISABLED ||
2036		    port->state == BR_STATE_BLOCKING)
2037			continue;
2038
2039		if (query == &br->ip4_own_query)
2040			br_multicast_enable(&port->ip4_own_query);
2041#if IS_ENABLED(CONFIG_IPV6)
2042		else
2043			br_multicast_enable(&port->ip6_own_query);
2044#endif
2045	}
2046	rcu_read_unlock();
2047}
2048
2049int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2050{
2051	struct net_bridge_port *port;
 
 
2052
2053	spin_lock_bh(&br->multicast_lock);
2054	if (!!br_opt_get(br, BROPT_MULTICAST_ENABLED) == !!val)
2055		goto unlock;
2056
2057	br_mc_disabled_update(br->dev, val);
2058	br_opt_toggle(br, BROPT_MULTICAST_ENABLED, !!val);
2059	if (!br_opt_get(br, BROPT_MULTICAST_ENABLED)) {
2060		br_multicast_leave_snoopers(br);
2061		goto unlock;
2062	}
2063
2064	if (!netif_running(br->dev))
2065		goto unlock;
2066
2067	br_multicast_open(br);
2068	list_for_each_entry(port, &br->port_list, list)
2069		__br_multicast_enable_port(port);
2070
2071unlock:
2072	spin_unlock_bh(&br->multicast_lock);
2073
2074	return 0;
2075}
2076
2077bool br_multicast_enabled(const struct net_device *dev)
2078{
2079	struct net_bridge *br = netdev_priv(dev);
2080
2081	return !!br_opt_get(br, BROPT_MULTICAST_ENABLED);
2082}
2083EXPORT_SYMBOL_GPL(br_multicast_enabled);
2084
2085bool br_multicast_router(const struct net_device *dev)
2086{
2087	struct net_bridge *br = netdev_priv(dev);
2088	bool is_router;
2089
2090	spin_lock_bh(&br->multicast_lock);
2091	is_router = br_multicast_is_router(br);
2092	spin_unlock_bh(&br->multicast_lock);
2093	return is_router;
2094}
2095EXPORT_SYMBOL_GPL(br_multicast_router);
2096
2097int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2098{
2099	unsigned long max_delay;
2100
2101	val = !!val;
2102
2103	spin_lock_bh(&br->multicast_lock);
2104	if (br_opt_get(br, BROPT_MULTICAST_QUERIER) == val)
2105		goto unlock;
2106
2107	br_opt_toggle(br, BROPT_MULTICAST_QUERIER, !!val);
2108	if (!val)
2109		goto unlock;
2110
2111	max_delay = br->multicast_query_response_interval;
2112
2113	if (!timer_pending(&br->ip4_other_query.timer))
2114		br->ip4_other_query.delay_time = jiffies + max_delay;
2115
2116	br_multicast_start_querier(br, &br->ip4_own_query);
2117
2118#if IS_ENABLED(CONFIG_IPV6)
2119	if (!timer_pending(&br->ip6_other_query.timer))
2120		br->ip6_other_query.delay_time = jiffies + max_delay;
2121
2122	br_multicast_start_querier(br, &br->ip6_own_query);
2123#endif
2124
2125unlock:
2126	spin_unlock_bh(&br->multicast_lock);
2127
2128	return 0;
2129}
2130
2131int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2132{
2133	/* Currently we support only version 2 and 3 */
2134	switch (val) {
2135	case 2:
2136	case 3:
2137		break;
2138	default:
2139		return -EINVAL;
2140	}
2141
2142	spin_lock_bh(&br->multicast_lock);
2143	br->multicast_igmp_version = val;
2144	spin_unlock_bh(&br->multicast_lock);
2145
2146	return 0;
2147}
2148
2149#if IS_ENABLED(CONFIG_IPV6)
2150int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2151{
2152	/* Currently we support version 1 and 2 */
2153	switch (val) {
2154	case 1:
2155	case 2:
2156		break;
2157	default:
2158		return -EINVAL;
2159	}
2160
2161	spin_lock_bh(&br->multicast_lock);
2162	br->multicast_mld_version = val;
2163	spin_unlock_bh(&br->multicast_lock);
2164
2165	return 0;
2166}
2167#endif
2168
2169/**
2170 * br_multicast_list_adjacent - Returns snooped multicast addresses
2171 * @dev:	The bridge port adjacent to which to retrieve addresses
2172 * @br_ip_list:	The list to store found, snooped multicast IP addresses in
2173 *
2174 * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2175 * snooping feature on all bridge ports of dev's bridge device, excluding
2176 * the addresses from dev itself.
2177 *
2178 * Returns the number of items added to br_ip_list.
2179 *
2180 * Notes:
2181 * - br_ip_list needs to be initialized by caller
2182 * - br_ip_list might contain duplicates in the end
2183 *   (needs to be taken care of by caller)
2184 * - br_ip_list needs to be freed by caller
2185 */
2186int br_multicast_list_adjacent(struct net_device *dev,
2187			       struct list_head *br_ip_list)
2188{
2189	struct net_bridge *br;
2190	struct net_bridge_port *port;
2191	struct net_bridge_port_group *group;
2192	struct br_ip_list *entry;
2193	int count = 0;
2194
2195	rcu_read_lock();
2196	if (!br_ip_list || !netif_is_bridge_port(dev))
2197		goto unlock;
2198
2199	port = br_port_get_rcu(dev);
2200	if (!port || !port->br)
2201		goto unlock;
2202
2203	br = port->br;
2204
2205	list_for_each_entry_rcu(port, &br->port_list, list) {
2206		if (!port->dev || port->dev == dev)
2207			continue;
2208
2209		hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2210			entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2211			if (!entry)
2212				goto unlock;
2213
2214			entry->addr = group->addr;
2215			list_add(&entry->list, br_ip_list);
2216			count++;
2217		}
2218	}
2219
2220unlock:
2221	rcu_read_unlock();
2222	return count;
2223}
2224EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2225
2226/**
2227 * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2228 * @dev: The bridge port providing the bridge on which to check for a querier
2229 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2230 *
2231 * Checks whether the given interface has a bridge on top and if so returns
2232 * true if a valid querier exists anywhere on the bridged link layer.
2233 * Otherwise returns false.
2234 */
2235bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2236{
2237	struct net_bridge *br;
2238	struct net_bridge_port *port;
2239	struct ethhdr eth;
2240	bool ret = false;
2241
2242	rcu_read_lock();
2243	if (!netif_is_bridge_port(dev))
2244		goto unlock;
2245
2246	port = br_port_get_rcu(dev);
2247	if (!port || !port->br)
2248		goto unlock;
2249
2250	br = port->br;
2251
2252	memset(&eth, 0, sizeof(eth));
2253	eth.h_proto = htons(proto);
2254
2255	ret = br_multicast_querier_exists(br, &eth);
2256
2257unlock:
2258	rcu_read_unlock();
2259	return ret;
2260}
2261EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2262
2263/**
2264 * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2265 * @dev: The bridge port adjacent to which to check for a querier
2266 * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2267 *
2268 * Checks whether the given interface has a bridge on top and if so returns
2269 * true if a selected querier is behind one of the other ports of this
2270 * bridge. Otherwise returns false.
2271 */
2272bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2273{
2274	struct net_bridge *br;
2275	struct net_bridge_port *port;
2276	bool ret = false;
2277
2278	rcu_read_lock();
2279	if (!netif_is_bridge_port(dev))
2280		goto unlock;
2281
2282	port = br_port_get_rcu(dev);
2283	if (!port || !port->br)
2284		goto unlock;
2285
2286	br = port->br;
2287
2288	switch (proto) {
2289	case ETH_P_IP:
2290		if (!timer_pending(&br->ip4_other_query.timer) ||
2291		    rcu_dereference(br->ip4_querier.port) == port)
2292			goto unlock;
2293		break;
2294#if IS_ENABLED(CONFIG_IPV6)
2295	case ETH_P_IPV6:
2296		if (!timer_pending(&br->ip6_other_query.timer) ||
2297		    rcu_dereference(br->ip6_querier.port) == port)
2298			goto unlock;
2299		break;
2300#endif
2301	default:
2302		goto unlock;
2303	}
2304
2305	ret = true;
2306unlock:
2307	rcu_read_unlock();
2308	return ret;
2309}
2310EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2311
2312static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2313			       const struct sk_buff *skb, u8 type, u8 dir)
2314{
2315	struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2316	__be16 proto = skb->protocol;
2317	unsigned int t_len;
2318
2319	u64_stats_update_begin(&pstats->syncp);
2320	switch (proto) {
2321	case htons(ETH_P_IP):
2322		t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2323		switch (type) {
2324		case IGMP_HOST_MEMBERSHIP_REPORT:
2325			pstats->mstats.igmp_v1reports[dir]++;
2326			break;
2327		case IGMPV2_HOST_MEMBERSHIP_REPORT:
2328			pstats->mstats.igmp_v2reports[dir]++;
2329			break;
2330		case IGMPV3_HOST_MEMBERSHIP_REPORT:
2331			pstats->mstats.igmp_v3reports[dir]++;
2332			break;
2333		case IGMP_HOST_MEMBERSHIP_QUERY:
2334			if (t_len != sizeof(struct igmphdr)) {
2335				pstats->mstats.igmp_v3queries[dir]++;
2336			} else {
2337				unsigned int offset = skb_transport_offset(skb);
2338				struct igmphdr *ih, _ihdr;
2339
2340				ih = skb_header_pointer(skb, offset,
2341							sizeof(_ihdr), &_ihdr);
2342				if (!ih)
2343					break;
2344				if (!ih->code)
2345					pstats->mstats.igmp_v1queries[dir]++;
2346				else
2347					pstats->mstats.igmp_v2queries[dir]++;
2348			}
2349			break;
2350		case IGMP_HOST_LEAVE_MESSAGE:
2351			pstats->mstats.igmp_leaves[dir]++;
2352			break;
2353		}
2354		break;
2355#if IS_ENABLED(CONFIG_IPV6)
2356	case htons(ETH_P_IPV6):
2357		t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2358			sizeof(struct ipv6hdr);
2359		t_len -= skb_network_header_len(skb);
2360		switch (type) {
2361		case ICMPV6_MGM_REPORT:
2362			pstats->mstats.mld_v1reports[dir]++;
2363			break;
2364		case ICMPV6_MLD2_REPORT:
2365			pstats->mstats.mld_v2reports[dir]++;
2366			break;
2367		case ICMPV6_MGM_QUERY:
2368			if (t_len != sizeof(struct mld_msg))
2369				pstats->mstats.mld_v2queries[dir]++;
2370			else
2371				pstats->mstats.mld_v1queries[dir]++;
2372			break;
2373		case ICMPV6_MGM_REDUCTION:
2374			pstats->mstats.mld_leaves[dir]++;
2375			break;
2376		}
2377		break;
2378#endif /* CONFIG_IPV6 */
2379	}
2380	u64_stats_update_end(&pstats->syncp);
2381}
2382
2383void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2384			const struct sk_buff *skb, u8 type, u8 dir)
2385{
2386	struct bridge_mcast_stats __percpu *stats;
2387
2388	/* if multicast_disabled is true then igmp type can't be set */
2389	if (!type || !br_opt_get(br, BROPT_MULTICAST_STATS_ENABLED))
2390		return;
2391
2392	if (p)
2393		stats = p->mcast_stats;
2394	else
2395		stats = br->mcast_stats;
2396	if (WARN_ON(!stats))
2397		return;
2398
2399	br_mcast_stats_add(stats, skb, type, dir);
2400}
2401
2402int br_multicast_init_stats(struct net_bridge *br)
2403{
2404	br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2405	if (!br->mcast_stats)
2406		return -ENOMEM;
2407
2408	return 0;
2409}
2410
2411void br_multicast_uninit_stats(struct net_bridge *br)
2412{
2413	free_percpu(br->mcast_stats);
2414}
2415
2416static void mcast_stats_add_dir(u64 *dst, u64 *src)
2417{
2418	dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2419	dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2420}
2421
2422void br_multicast_get_stats(const struct net_bridge *br,
2423			    const struct net_bridge_port *p,
2424			    struct br_mcast_stats *dest)
2425{
2426	struct bridge_mcast_stats __percpu *stats;
2427	struct br_mcast_stats tdst;
2428	int i;
2429
2430	memset(dest, 0, sizeof(*dest));
2431	if (p)
2432		stats = p->mcast_stats;
2433	else
2434		stats = br->mcast_stats;
2435	if (WARN_ON(!stats))
2436		return;
2437
2438	memset(&tdst, 0, sizeof(tdst));
2439	for_each_possible_cpu(i) {
2440		struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2441		struct br_mcast_stats temp;
2442		unsigned int start;
2443
2444		do {
2445			start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2446			memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2447		} while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2448
2449		mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2450		mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2451		mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2452		mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2453		mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2454		mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2455		mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2456		tdst.igmp_parse_errors += temp.igmp_parse_errors;
2457
2458		mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2459		mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2460		mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2461		mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2462		mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2463		tdst.mld_parse_errors += temp.mld_parse_errors;
2464	}
2465	memcpy(dest, &tdst, sizeof(*dest));
2466}
2467
2468int br_mdb_hash_init(struct net_bridge *br)
2469{
2470	return rhashtable_init(&br->mdb_hash_tbl, &br_mdb_rht_params);
2471}
2472
2473void br_mdb_hash_fini(struct net_bridge *br)
2474{
2475	rhashtable_destroy(&br->mdb_hash_tbl);
2476}