v4.19.13 snapshot.
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
new file mode 100644
index 0000000..6dec8e9
--- /dev/null
+++ b/net/bridge/br_multicast.c
@@ -0,0 +1,2647 @@
+/*
+ * Bridge multicast support.
+ *
+ * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/export.h>
+#include <linux/if_ether.h>
+#include <linux/igmp.h>
+#include <linux/jhash.h>
+#include <linux/kernel.h>
+#include <linux/log2.h>
+#include <linux/netdevice.h>
+#include <linux/netfilter_bridge.h>
+#include <linux/random.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/inetdevice.h>
+#include <linux/mroute.h>
+#include <net/ip.h>
+#include <net/switchdev.h>
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/mld.h>
+#include <net/ip6_checksum.h>
+#include <net/addrconf.h>
+#endif
+
+#include "br_private.h"
+
+static void br_multicast_start_querier(struct net_bridge *br,
+ struct bridge_mcast_own_query *query);
+static void br_multicast_add_router(struct net_bridge *br,
+ struct net_bridge_port *port);
+static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 group,
+ __u16 vid,
+ const unsigned char *src);
+
+static void __del_port_router(struct net_bridge_port *p);
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct in6_addr *group,
+ __u16 vid, const unsigned char *src);
+#endif
+unsigned int br_mdb_rehash_seq;
+
+static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
+{
+ if (a->proto != b->proto)
+ return 0;
+ if (a->vid != b->vid)
+ return 0;
+ switch (a->proto) {
+ case htons(ETH_P_IP):
+ return a->u.ip4 == b->u.ip4;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
+#endif
+ }
+ return 0;
+}
+
+static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
+ __u16 vid)
+{
+ return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
+ const struct in6_addr *ip,
+ __u16 vid)
+{
+ return jhash_2words(ipv6_addr_hash(ip), vid,
+ mdb->secret) & (mdb->max - 1);
+}
+#endif
+
+static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
+ struct br_ip *ip)
+{
+ switch (ip->proto) {
+ case htons(ETH_P_IP):
+ return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
+#endif
+ }
+ return 0;
+}
+
+static struct net_bridge_mdb_entry *__br_mdb_ip_get(
+ struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
+{
+ struct net_bridge_mdb_entry *mp;
+
+ hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
+ if (br_ip_equal(&mp->addr, dst))
+ return mp;
+ }
+
+ return NULL;
+}
+
+struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
+ struct br_ip *dst)
+{
+ if (!mdb)
+ return NULL;
+
+ return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
+}
+
+static struct net_bridge_mdb_entry *br_mdb_ip4_get(
+ struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
+{
+ struct br_ip br_dst;
+
+ br_dst.u.ip4 = dst;
+ br_dst.proto = htons(ETH_P_IP);
+ br_dst.vid = vid;
+
+ return br_mdb_ip_get(mdb, &br_dst);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct net_bridge_mdb_entry *br_mdb_ip6_get(
+ struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
+ __u16 vid)
+{
+ struct br_ip br_dst;
+
+ br_dst.u.ip6 = *dst;
+ br_dst.proto = htons(ETH_P_IPV6);
+ br_dst.vid = vid;
+
+ return br_mdb_ip_get(mdb, &br_dst);
+}
+#endif
+
+struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
+ struct sk_buff *skb, u16 vid)
+{
+ struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
+ struct br_ip ip;
+
+ if (br->multicast_disabled)
+ return NULL;
+
+ if (BR_INPUT_SKB_CB(skb)->igmp)
+ return NULL;
+
+ ip.proto = skb->protocol;
+ ip.vid = vid;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ip.u.ip4 = ip_hdr(skb)->daddr;
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ ip.u.ip6 = ipv6_hdr(skb)->daddr;
+ break;
+#endif
+ default:
+ return NULL;
+ }
+
+ return br_mdb_ip_get(mdb, &ip);
+}
+
+static void br_mdb_free(struct rcu_head *head)
+{
+ struct net_bridge_mdb_htable *mdb =
+ container_of(head, struct net_bridge_mdb_htable, rcu);
+ struct net_bridge_mdb_htable *old = mdb->old;
+
+ mdb->old = NULL;
+ kfree(old->mhash);
+ kfree(old);
+}
+
+static int br_mdb_copy(struct net_bridge_mdb_htable *new,
+ struct net_bridge_mdb_htable *old,
+ int elasticity)
+{
+ struct net_bridge_mdb_entry *mp;
+ int maxlen;
+ int len;
+ int i;
+
+ for (i = 0; i < old->max; i++)
+ hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
+ hlist_add_head(&mp->hlist[new->ver],
+ &new->mhash[br_ip_hash(new, &mp->addr)]);
+
+ if (!elasticity)
+ return 0;
+
+ maxlen = 0;
+ for (i = 0; i < new->max; i++) {
+ len = 0;
+ hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
+ len++;
+ if (len > maxlen)
+ maxlen = len;
+ }
+
+ return maxlen > elasticity ? -EINVAL : 0;
+}
+
+void br_multicast_free_pg(struct rcu_head *head)
+{
+ struct net_bridge_port_group *p =
+ container_of(head, struct net_bridge_port_group, rcu);
+
+ kfree(p);
+}
+
+static void br_multicast_free_group(struct rcu_head *head)
+{
+ struct net_bridge_mdb_entry *mp =
+ container_of(head, struct net_bridge_mdb_entry, rcu);
+
+ kfree(mp);
+}
+
+static void br_multicast_group_expired(struct timer_list *t)
+{
+ struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
+ struct net_bridge *br = mp->br;
+ struct net_bridge_mdb_htable *mdb;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || timer_pending(&mp->timer))
+ goto out;
+
+ mp->host_joined = false;
+ br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
+
+ if (mp->ports)
+ goto out;
+
+ mdb = mlock_dereference(br->mdb, br);
+
+ hlist_del_rcu(&mp->hlist[mdb->ver]);
+ mdb->size--;
+
+ call_rcu_bh(&mp->rcu, br_multicast_free_group);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_multicast_del_pg(struct net_bridge *br,
+ struct net_bridge_port_group *pg)
+{
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group __rcu **pp;
+
+ mdb = mlock_dereference(br->mdb, br);
+
+ mp = br_mdb_ip_get(mdb, &pg->addr);
+ if (WARN_ON(!mp))
+ return;
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (p != pg)
+ continue;
+
+ rcu_assign_pointer(*pp, p->next);
+ hlist_del_init(&p->mglist);
+ del_timer(&p->timer);
+ br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
+ p->flags);
+ call_rcu_bh(&p->rcu, br_multicast_free_pg);
+
+ if (!mp->ports && !mp->host_joined &&
+ netif_running(br->dev))
+ mod_timer(&mp->timer, jiffies);
+
+ return;
+ }
+
+ WARN_ON(1);
+}
+
+static void br_multicast_port_group_expired(struct timer_list *t)
+{
+ struct net_bridge_port_group *pg = from_timer(pg, t, timer);
+ struct net_bridge *br = pg->port->br;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
+ hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
+ goto out;
+
+ br_multicast_del_pg(br, pg);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
+ int elasticity)
+{
+ struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
+ struct net_bridge_mdb_htable *mdb;
+ int err;
+
+ mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
+ if (!mdb)
+ return -ENOMEM;
+
+ mdb->max = max;
+ mdb->old = old;
+
+ mdb->mhash = kcalloc(max, sizeof(*mdb->mhash), GFP_ATOMIC);
+ if (!mdb->mhash) {
+ kfree(mdb);
+ return -ENOMEM;
+ }
+
+ mdb->size = old ? old->size : 0;
+ mdb->ver = old ? old->ver ^ 1 : 0;
+
+ if (!old || elasticity)
+ get_random_bytes(&mdb->secret, sizeof(mdb->secret));
+ else
+ mdb->secret = old->secret;
+
+ if (!old)
+ goto out;
+
+ err = br_mdb_copy(mdb, old, elasticity);
+ if (err) {
+ kfree(mdb->mhash);
+ kfree(mdb);
+ return err;
+ }
+
+ br_mdb_rehash_seq++;
+ call_rcu_bh(&mdb->rcu, br_mdb_free);
+
+out:
+ rcu_assign_pointer(*mdbp, mdb);
+
+ return 0;
+}
+
+static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
+ __be32 group,
+ u8 *igmp_type)
+{
+ struct igmpv3_query *ihv3;
+ size_t igmp_hdr_size;
+ struct sk_buff *skb;
+ struct igmphdr *ih;
+ struct ethhdr *eth;
+ struct iphdr *iph;
+
+ igmp_hdr_size = sizeof(*ih);
+ if (br->multicast_igmp_version == 3)
+ igmp_hdr_size = sizeof(*ihv3);
+ skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
+ igmp_hdr_size + 4);
+ if (!skb)
+ goto out;
+
+ skb->protocol = htons(ETH_P_IP);
+
+ skb_reset_mac_header(skb);
+ eth = eth_hdr(skb);
+
+ ether_addr_copy(eth->h_source, br->dev->dev_addr);
+ eth->h_dest[0] = 1;
+ eth->h_dest[1] = 0;
+ eth->h_dest[2] = 0x5e;
+ eth->h_dest[3] = 0;
+ eth->h_dest[4] = 0;
+ eth->h_dest[5] = 1;
+ eth->h_proto = htons(ETH_P_IP);
+ skb_put(skb, sizeof(*eth));
+
+ skb_set_network_header(skb, skb->len);
+ iph = ip_hdr(skb);
+
+ iph->version = 4;
+ iph->ihl = 6;
+ iph->tos = 0xc0;
+ iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
+ iph->id = 0;
+ iph->frag_off = htons(IP_DF);
+ iph->ttl = 1;
+ iph->protocol = IPPROTO_IGMP;
+ iph->saddr = br->multicast_query_use_ifaddr ?
+ inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
+ iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
+ ((u8 *)&iph[1])[0] = IPOPT_RA;
+ ((u8 *)&iph[1])[1] = 4;
+ ((u8 *)&iph[1])[2] = 0;
+ ((u8 *)&iph[1])[3] = 0;
+ ip_send_check(iph);
+ skb_put(skb, 24);
+
+ skb_set_transport_header(skb, skb->len);
+ *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
+
+ switch (br->multicast_igmp_version) {
+ case 2:
+ ih = igmp_hdr(skb);
+ ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
+ ih->code = (group ? br->multicast_last_member_interval :
+ br->multicast_query_response_interval) /
+ (HZ / IGMP_TIMER_SCALE);
+ ih->group = group;
+ ih->csum = 0;
+ ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
+ break;
+ case 3:
+ ihv3 = igmpv3_query_hdr(skb);
+ ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
+ ihv3->code = (group ? br->multicast_last_member_interval :
+ br->multicast_query_response_interval) /
+ (HZ / IGMP_TIMER_SCALE);
+ ihv3->group = group;
+ ihv3->qqic = br->multicast_query_interval / HZ;
+ ihv3->nsrcs = 0;
+ ihv3->resv = 0;
+ ihv3->suppress = 0;
+ ihv3->qrv = 2;
+ ihv3->csum = 0;
+ ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
+ break;
+ }
+
+ skb_put(skb, igmp_hdr_size);
+ __skb_pull(skb, sizeof(*eth));
+
+out:
+ return skb;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
+ const struct in6_addr *grp,
+ u8 *igmp_type)
+{
+ struct mld2_query *mld2q;
+ unsigned long interval;
+ struct ipv6hdr *ip6h;
+ struct mld_msg *mldq;
+ size_t mld_hdr_size;
+ struct sk_buff *skb;
+ struct ethhdr *eth;
+ u8 *hopopt;
+
+ mld_hdr_size = sizeof(*mldq);
+ if (br->multicast_mld_version == 2)
+ mld_hdr_size = sizeof(*mld2q);
+ skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
+ 8 + mld_hdr_size);
+ if (!skb)
+ goto out;
+
+ skb->protocol = htons(ETH_P_IPV6);
+
+ /* Ethernet header */
+ skb_reset_mac_header(skb);
+ eth = eth_hdr(skb);
+
+ ether_addr_copy(eth->h_source, br->dev->dev_addr);
+ eth->h_proto = htons(ETH_P_IPV6);
+ skb_put(skb, sizeof(*eth));
+
+ /* IPv6 header + HbH option */
+ skb_set_network_header(skb, skb->len);
+ ip6h = ipv6_hdr(skb);
+
+ *(__force __be32 *)ip6h = htonl(0x60000000);
+ ip6h->payload_len = htons(8 + mld_hdr_size);
+ ip6h->nexthdr = IPPROTO_HOPOPTS;
+ ip6h->hop_limit = 1;
+ ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
+ if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
+ &ip6h->saddr)) {
+ kfree_skb(skb);
+ br->has_ipv6_addr = 0;
+ return NULL;
+ }
+
+ br->has_ipv6_addr = 1;
+ ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
+
+ hopopt = (u8 *)(ip6h + 1);
+ hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
+ hopopt[1] = 0; /* length of HbH */
+ hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
+ hopopt[3] = 2; /* Length of RA Option */
+ hopopt[4] = 0; /* Type = 0x0000 (MLD) */
+ hopopt[5] = 0;
+ hopopt[6] = IPV6_TLV_PAD1; /* Pad1 */
+ hopopt[7] = IPV6_TLV_PAD1; /* Pad1 */
+
+ skb_put(skb, sizeof(*ip6h) + 8);
+
+ /* ICMPv6 */
+ skb_set_transport_header(skb, skb->len);
+ interval = ipv6_addr_any(grp) ?
+ br->multicast_query_response_interval :
+ br->multicast_last_member_interval;
+ *igmp_type = ICMPV6_MGM_QUERY;
+ switch (br->multicast_mld_version) {
+ case 1:
+ mldq = (struct mld_msg *)icmp6_hdr(skb);
+ mldq->mld_type = ICMPV6_MGM_QUERY;
+ mldq->mld_code = 0;
+ mldq->mld_cksum = 0;
+ mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
+ mldq->mld_reserved = 0;
+ mldq->mld_mca = *grp;
+ mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+ sizeof(*mldq), IPPROTO_ICMPV6,
+ csum_partial(mldq,
+ sizeof(*mldq),
+ 0));
+ break;
+ case 2:
+ mld2q = (struct mld2_query *)icmp6_hdr(skb);
+ mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
+ mld2q->mld2q_type = ICMPV6_MGM_QUERY;
+ mld2q->mld2q_code = 0;
+ mld2q->mld2q_cksum = 0;
+ mld2q->mld2q_resv1 = 0;
+ mld2q->mld2q_resv2 = 0;
+ mld2q->mld2q_suppress = 0;
+ mld2q->mld2q_qrv = 2;
+ mld2q->mld2q_nsrcs = 0;
+ mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
+ mld2q->mld2q_mca = *grp;
+ mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
+ sizeof(*mld2q),
+ IPPROTO_ICMPV6,
+ csum_partial(mld2q,
+ sizeof(*mld2q),
+ 0));
+ break;
+ }
+ skb_put(skb, mld_hdr_size);
+
+ __skb_pull(skb, sizeof(*eth));
+
+out:
+ return skb;
+}
+#endif
+
+static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
+ struct br_ip *addr,
+ u8 *igmp_type)
+{
+ switch (addr->proto) {
+ case htons(ETH_P_IP):
+ return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
+ igmp_type);
+#endif
+ }
+ return NULL;
+}
+
+static struct net_bridge_mdb_entry *br_multicast_get_group(
+ struct net_bridge *br, struct net_bridge_port *port,
+ struct br_ip *group, int hash)
+{
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_mdb_entry *mp;
+ unsigned int count = 0;
+ unsigned int max;
+ int elasticity;
+ int err;
+
+ mdb = rcu_dereference_protected(br->mdb, 1);
+ hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
+ count++;
+ if (unlikely(br_ip_equal(group, &mp->addr)))
+ return mp;
+ }
+
+ elasticity = 0;
+ max = mdb->max;
+
+ if (unlikely(count > br->hash_elasticity && count)) {
+ if (net_ratelimit())
+ br_info(br, "Multicast hash table "
+ "chain limit reached: %s\n",
+ port ? port->dev->name : br->dev->name);
+
+ elasticity = br->hash_elasticity;
+ }
+
+ if (mdb->size >= max) {
+ max *= 2;
+ if (unlikely(max > br->hash_max)) {
+ br_warn(br, "Multicast hash table maximum of %d "
+ "reached, disabling snooping: %s\n",
+ br->hash_max,
+ port ? port->dev->name : br->dev->name);
+ err = -E2BIG;
+disable:
+ br->multicast_disabled = 1;
+ goto err;
+ }
+ }
+
+ if (max > mdb->max || elasticity) {
+ if (mdb->old) {
+ if (net_ratelimit())
+ br_info(br, "Multicast hash table "
+ "on fire: %s\n",
+ port ? port->dev->name : br->dev->name);
+ err = -EEXIST;
+ goto err;
+ }
+
+ err = br_mdb_rehash(&br->mdb, max, elasticity);
+ if (err) {
+ br_warn(br, "Cannot rehash multicast "
+ "hash table, disabling snooping: %s, %d, %d\n",
+ port ? port->dev->name : br->dev->name,
+ mdb->size, err);
+ goto disable;
+ }
+
+ err = -EAGAIN;
+ goto err;
+ }
+
+ return NULL;
+
+err:
+ mp = ERR_PTR(err);
+ return mp;
+}
+
+struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
+ struct net_bridge_port *p,
+ struct br_ip *group)
+{
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_mdb_entry *mp;
+ int hash;
+ int err;
+
+ mdb = rcu_dereference_protected(br->mdb, 1);
+ if (!mdb) {
+ err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
+ if (err)
+ return ERR_PTR(err);
+ goto rehash;
+ }
+
+ hash = br_ip_hash(mdb, group);
+ mp = br_multicast_get_group(br, p, group, hash);
+ switch (PTR_ERR(mp)) {
+ case 0:
+ break;
+
+ case -EAGAIN:
+rehash:
+ mdb = rcu_dereference_protected(br->mdb, 1);
+ hash = br_ip_hash(mdb, group);
+ break;
+
+ default:
+ goto out;
+ }
+
+ mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
+ if (unlikely(!mp))
+ return ERR_PTR(-ENOMEM);
+
+ mp->br = br;
+ mp->addr = *group;
+ timer_setup(&mp->timer, br_multicast_group_expired, 0);
+
+ hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
+ mdb->size++;
+
+out:
+ return mp;
+}
+
+struct net_bridge_port_group *br_multicast_new_port_group(
+ struct net_bridge_port *port,
+ struct br_ip *group,
+ struct net_bridge_port_group __rcu *next,
+ unsigned char flags,
+ const unsigned char *src)
+{
+ struct net_bridge_port_group *p;
+
+ p = kzalloc(sizeof(*p), GFP_ATOMIC);
+ if (unlikely(!p))
+ return NULL;
+
+ p->addr = *group;
+ p->port = port;
+ p->flags = flags;
+ rcu_assign_pointer(p->next, next);
+ hlist_add_head(&p->mglist, &port->mglist);
+ timer_setup(&p->timer, br_multicast_port_group_expired, 0);
+
+ if (src)
+ memcpy(p->eth_addr, src, ETH_ALEN);
+ else
+ memset(p->eth_addr, 0xff, ETH_ALEN);
+
+ return p;
+}
+
+static bool br_port_group_equal(struct net_bridge_port_group *p,
+ struct net_bridge_port *port,
+ const unsigned char *src)
+{
+ if (p->port != port)
+ return false;
+
+ if (!(port->flags & BR_MULTICAST_TO_UNICAST))
+ return true;
+
+ return ether_addr_equal(src, p->eth_addr);
+}
+
+static int br_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct br_ip *group,
+ const unsigned char *src)
+{
+ struct net_bridge_port_group __rcu **pp;
+ struct net_bridge_port_group *p;
+ struct net_bridge_mdb_entry *mp;
+ unsigned long now = jiffies;
+ int err;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) ||
+ (port && port->state == BR_STATE_DISABLED))
+ goto out;
+
+ mp = br_multicast_new_group(br, port, group);
+ err = PTR_ERR(mp);
+ if (IS_ERR(mp))
+ goto err;
+
+ if (!port) {
+ if (!mp->host_joined) {
+ mp->host_joined = true;
+ br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
+ }
+ mod_timer(&mp->timer, now + br->multicast_membership_interval);
+ goto out;
+ }
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (br_port_group_equal(p, port, src))
+ goto found;
+ if ((unsigned long)p->port < (unsigned long)port)
+ break;
+ }
+
+ p = br_multicast_new_port_group(port, group, *pp, 0, src);
+ if (unlikely(!p))
+ goto err;
+ rcu_assign_pointer(*pp, p);
+ br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
+
+found:
+ mod_timer(&p->timer, now + br->multicast_membership_interval);
+out:
+ err = 0;
+
+err:
+ spin_unlock(&br->multicast_lock);
+ return err;
+}
+
+static int br_ip4_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 group,
+ __u16 vid,
+ const unsigned char *src)
+{
+ struct br_ip br_group;
+
+ if (ipv4_is_local_multicast(group))
+ return 0;
+
+ br_group.u.ip4 = group;
+ br_group.proto = htons(ETH_P_IP);
+ br_group.vid = vid;
+
+ return br_multicast_add_group(br, port, &br_group, src);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_ip6_multicast_add_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct in6_addr *group,
+ __u16 vid,
+ const unsigned char *src)
+{
+ struct br_ip br_group;
+
+ if (ipv6_addr_is_ll_all_nodes(group))
+ return 0;
+
+ br_group.u.ip6 = *group;
+ br_group.proto = htons(ETH_P_IPV6);
+ br_group.vid = vid;
+
+ return br_multicast_add_group(br, port, &br_group, src);
+}
+#endif
+
+static void br_multicast_router_expired(struct timer_list *t)
+{
+ struct net_bridge_port *port =
+ from_timer(port, t, multicast_router_timer);
+ struct net_bridge *br = port->br;
+
+ spin_lock(&br->multicast_lock);
+ if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
+ port->multicast_router == MDB_RTR_TYPE_PERM ||
+ timer_pending(&port->multicast_router_timer))
+ goto out;
+
+ __del_port_router(port);
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_mc_router_state_change(struct net_bridge *p,
+ bool is_mc_router)
+{
+ struct switchdev_attr attr = {
+ .orig_dev = p->dev,
+ .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
+ .flags = SWITCHDEV_F_DEFER,
+ .u.mrouter = is_mc_router,
+ };
+
+ switchdev_port_attr_set(p->dev, &attr);
+}
+
+static void br_multicast_local_router_expired(struct timer_list *t)
+{
+ struct net_bridge *br = from_timer(br, t, multicast_router_timer);
+
+ spin_lock(&br->multicast_lock);
+ if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
+ br->multicast_router == MDB_RTR_TYPE_PERM ||
+ timer_pending(&br->multicast_router_timer))
+ goto out;
+
+ br_mc_router_state_change(br, false);
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_multicast_querier_expired(struct net_bridge *br,
+ struct bridge_mcast_own_query *query)
+{
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) || br->multicast_disabled)
+ goto out;
+
+ br_multicast_start_querier(br, query);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_querier_expired(struct timer_list *t)
+{
+ struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
+
+ br_multicast_querier_expired(br, &br->ip4_own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_querier_expired(struct timer_list *t)
+{
+ struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
+
+ br_multicast_querier_expired(br, &br->ip6_own_query);
+}
+#endif
+
+static void br_multicast_select_own_querier(struct net_bridge *br,
+ struct br_ip *ip,
+ struct sk_buff *skb)
+{
+ if (ip->proto == htons(ETH_P_IP))
+ br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
+#endif
+}
+
+static void __br_multicast_send_query(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct br_ip *ip)
+{
+ struct sk_buff *skb;
+ u8 igmp_type;
+
+ skb = br_multicast_alloc_query(br, ip, &igmp_type);
+ if (!skb)
+ return;
+
+ if (port) {
+ skb->dev = port->dev;
+ br_multicast_count(br, port, skb, igmp_type,
+ BR_MCAST_DIR_TX);
+ NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
+ dev_net(port->dev), NULL, skb, NULL, skb->dev,
+ br_dev_queue_push_xmit);
+ } else {
+ br_multicast_select_own_querier(br, ip, skb);
+ br_multicast_count(br, port, skb, igmp_type,
+ BR_MCAST_DIR_RX);
+ netif_rx(skb);
+ }
+}
+
+static void br_multicast_send_query(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct bridge_mcast_own_query *own_query)
+{
+ struct bridge_mcast_other_query *other_query = NULL;
+ struct br_ip br_group;
+ unsigned long time;
+
+ if (!netif_running(br->dev) || br->multicast_disabled ||
+ !br->multicast_querier)
+ return;
+
+ memset(&br_group.u, 0, sizeof(br_group.u));
+
+ if (port ? (own_query == &port->ip4_own_query) :
+ (own_query == &br->ip4_own_query)) {
+ other_query = &br->ip4_other_query;
+ br_group.proto = htons(ETH_P_IP);
+#if IS_ENABLED(CONFIG_IPV6)
+ } else {
+ other_query = &br->ip6_other_query;
+ br_group.proto = htons(ETH_P_IPV6);
+#endif
+ }
+
+ if (!other_query || timer_pending(&other_query->timer))
+ return;
+
+ __br_multicast_send_query(br, port, &br_group);
+
+ time = jiffies;
+ time += own_query->startup_sent < br->multicast_startup_query_count ?
+ br->multicast_startup_query_interval :
+ br->multicast_query_interval;
+ mod_timer(&own_query->timer, time);
+}
+
+static void
+br_multicast_port_query_expired(struct net_bridge_port *port,
+ struct bridge_mcast_own_query *query)
+{
+ struct net_bridge *br = port->br;
+
+ spin_lock(&br->multicast_lock);
+ if (port->state == BR_STATE_DISABLED ||
+ port->state == BR_STATE_BLOCKING)
+ goto out;
+
+ if (query->startup_sent < br->multicast_startup_query_count)
+ query->startup_sent++;
+
+ br_multicast_send_query(port->br, port, query);
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_port_query_expired(struct timer_list *t)
+{
+ struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
+
+ br_multicast_port_query_expired(port, &port->ip4_own_query);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_port_query_expired(struct timer_list *t)
+{
+ struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
+
+ br_multicast_port_query_expired(port, &port->ip6_own_query);
+}
+#endif
+
+static void br_mc_disabled_update(struct net_device *dev, bool value)
+{
+ struct switchdev_attr attr = {
+ .orig_dev = dev,
+ .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
+ .flags = SWITCHDEV_F_DEFER,
+ .u.mc_disabled = value,
+ };
+
+ switchdev_port_attr_set(dev, &attr);
+}
+
+int br_multicast_add_port(struct net_bridge_port *port)
+{
+ port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+
+ timer_setup(&port->multicast_router_timer,
+ br_multicast_router_expired, 0);
+ timer_setup(&port->ip4_own_query.timer,
+ br_ip4_multicast_port_query_expired, 0);
+#if IS_ENABLED(CONFIG_IPV6)
+ timer_setup(&port->ip6_own_query.timer,
+ br_ip6_multicast_port_query_expired, 0);
+#endif
+ br_mc_disabled_update(port->dev, port->br->multicast_disabled);
+
+ port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
+ if (!port->mcast_stats)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void br_multicast_del_port(struct net_bridge_port *port)
+{
+ struct net_bridge *br = port->br;
+ struct net_bridge_port_group *pg;
+ struct hlist_node *n;
+
+ /* Take care of the remaining groups, only perm ones should be left */
+ spin_lock_bh(&br->multicast_lock);
+ hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
+ br_multicast_del_pg(br, pg);
+ spin_unlock_bh(&br->multicast_lock);
+ del_timer_sync(&port->multicast_router_timer);
+ free_percpu(port->mcast_stats);
+}
+
+static void br_multicast_enable(struct bridge_mcast_own_query *query)
+{
+ query->startup_sent = 0;
+
+ if (try_to_del_timer_sync(&query->timer) >= 0 ||
+ del_timer(&query->timer))
+ mod_timer(&query->timer, jiffies);
+}
+
+static void __br_multicast_enable_port(struct net_bridge_port *port)
+{
+ struct net_bridge *br = port->br;
+
+ if (br->multicast_disabled || !netif_running(br->dev))
+ return;
+
+ br_multicast_enable(&port->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+ br_multicast_enable(&port->ip6_own_query);
+#endif
+ if (port->multicast_router == MDB_RTR_TYPE_PERM &&
+ hlist_unhashed(&port->rlist))
+ br_multicast_add_router(br, port);
+}
+
+void br_multicast_enable_port(struct net_bridge_port *port)
+{
+ struct net_bridge *br = port->br;
+
+ spin_lock(&br->multicast_lock);
+ __br_multicast_enable_port(port);
+ spin_unlock(&br->multicast_lock);
+}
+
+void br_multicast_disable_port(struct net_bridge_port *port)
+{
+ struct net_bridge *br = port->br;
+ struct net_bridge_port_group *pg;
+ struct hlist_node *n;
+
+ spin_lock(&br->multicast_lock);
+ hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
+ if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
+ br_multicast_del_pg(br, pg);
+
+ __del_port_router(port);
+
+ del_timer(&port->multicast_router_timer);
+ del_timer(&port->ip4_own_query.timer);
+#if IS_ENABLED(CONFIG_IPV6)
+ del_timer(&port->ip6_own_query.timer);
+#endif
+ spin_unlock(&br->multicast_lock);
+}
+
+static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb,
+ u16 vid)
+{
+ const unsigned char *src;
+ struct igmpv3_report *ih;
+ struct igmpv3_grec *grec;
+ int i;
+ int len;
+ int num;
+ int type;
+ int err = 0;
+ __be32 group;
+
+ ih = igmpv3_report_hdr(skb);
+ num = ntohs(ih->ngrec);
+ len = skb_transport_offset(skb) + sizeof(*ih);
+
+ for (i = 0; i < num; i++) {
+ len += sizeof(*grec);
+ if (!pskb_may_pull(skb, len))
+ return -EINVAL;
+
+ grec = (void *)(skb->data + len - sizeof(*grec));
+ group = grec->grec_mca;
+ type = grec->grec_type;
+
+ len += ntohs(grec->grec_nsrcs) * 4;
+ if (!pskb_may_pull(skb, len))
+ return -EINVAL;
+
+ /* We treat this as an IGMPv2 report for now. */
+ switch (type) {
+ case IGMPV3_MODE_IS_INCLUDE:
+ case IGMPV3_MODE_IS_EXCLUDE:
+ case IGMPV3_CHANGE_TO_INCLUDE:
+ case IGMPV3_CHANGE_TO_EXCLUDE:
+ case IGMPV3_ALLOW_NEW_SOURCES:
+ case IGMPV3_BLOCK_OLD_SOURCES:
+ break;
+
+ default:
+ continue;
+ }
+
+ src = eth_hdr(skb)->h_source;
+ if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
+ type == IGMPV3_MODE_IS_INCLUDE) &&
+ ntohs(grec->grec_nsrcs) == 0) {
+ br_ip4_multicast_leave_group(br, port, group, vid, src);
+ } else {
+ err = br_ip4_multicast_add_group(br, port, group, vid,
+ src);
+ if (err)
+ break;
+ }
+ }
+
+ return err;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_ip6_multicast_mld2_report(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb,
+ u16 vid)
+{
+ const unsigned char *src;
+ struct icmp6hdr *icmp6h;
+ struct mld2_grec *grec;
+ int i;
+ int len;
+ int num;
+ int err = 0;
+
+ if (!pskb_may_pull(skb, sizeof(*icmp6h)))
+ return -EINVAL;
+
+ icmp6h = icmp6_hdr(skb);
+ num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
+ len = skb_transport_offset(skb) + sizeof(*icmp6h);
+
+ for (i = 0; i < num; i++) {
+ __be16 *nsrcs, _nsrcs;
+
+ nsrcs = skb_header_pointer(skb,
+ len + offsetof(struct mld2_grec,
+ grec_nsrcs),
+ sizeof(_nsrcs), &_nsrcs);
+ if (!nsrcs)
+ return -EINVAL;
+
+ if (!pskb_may_pull(skb,
+ len + sizeof(*grec) +
+ sizeof(struct in6_addr) * ntohs(*nsrcs)))
+ return -EINVAL;
+
+ grec = (struct mld2_grec *)(skb->data + len);
+ len += sizeof(*grec) +
+ sizeof(struct in6_addr) * ntohs(*nsrcs);
+
+ /* We treat these as MLDv1 reports for now. */
+ switch (grec->grec_type) {
+ case MLD2_MODE_IS_INCLUDE:
+ case MLD2_MODE_IS_EXCLUDE:
+ case MLD2_CHANGE_TO_INCLUDE:
+ case MLD2_CHANGE_TO_EXCLUDE:
+ case MLD2_ALLOW_NEW_SOURCES:
+ case MLD2_BLOCK_OLD_SOURCES:
+ break;
+
+ default:
+ continue;
+ }
+
+ src = eth_hdr(skb)->h_source;
+ if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
+ grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
+ ntohs(*nsrcs) == 0) {
+ br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
+ vid, src);
+ } else {
+ err = br_ip6_multicast_add_group(br, port,
+ &grec->grec_mca, vid,
+ src);
+ if (err)
+ break;
+ }
+ }
+
+ return err;
+}
+#endif
+
+static bool br_ip4_multicast_select_querier(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 saddr)
+{
+ if (!timer_pending(&br->ip4_own_query.timer) &&
+ !timer_pending(&br->ip4_other_query.timer))
+ goto update;
+
+ if (!br->ip4_querier.addr.u.ip4)
+ goto update;
+
+ if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
+ goto update;
+
+ return false;
+
+update:
+ br->ip4_querier.addr.u.ip4 = saddr;
+
+ /* update protected by general multicast_lock by caller */
+ rcu_assign_pointer(br->ip4_querier.port, port);
+
+ return true;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static bool br_ip6_multicast_select_querier(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct in6_addr *saddr)
+{
+ if (!timer_pending(&br->ip6_own_query.timer) &&
+ !timer_pending(&br->ip6_other_query.timer))
+ goto update;
+
+ if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
+ goto update;
+
+ return false;
+
+update:
+ br->ip6_querier.addr.u.ip6 = *saddr;
+
+ /* update protected by general multicast_lock by caller */
+ rcu_assign_pointer(br->ip6_querier.port, port);
+
+ return true;
+}
+#endif
+
+static bool br_multicast_select_querier(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct br_ip *saddr)
+{
+ switch (saddr->proto) {
+ case htons(ETH_P_IP):
+ return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
+#endif
+ }
+
+ return false;
+}
+
+static void
+br_multicast_update_query_timer(struct net_bridge *br,
+ struct bridge_mcast_other_query *query,
+ unsigned long max_delay)
+{
+ if (!timer_pending(&query->timer))
+ query->delay_time = jiffies + max_delay;
+
+ mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
+}
+
+static void br_port_mc_router_state_change(struct net_bridge_port *p,
+ bool is_mc_router)
+{
+ struct switchdev_attr attr = {
+ .orig_dev = p->dev,
+ .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
+ .flags = SWITCHDEV_F_DEFER,
+ .u.mrouter = is_mc_router,
+ };
+
+ switchdev_port_attr_set(p->dev, &attr);
+}
+
+/*
+ * Add port to router_list
+ * list is maintained ordered by pointer value
+ * and locked by br->multicast_lock and RCU
+ */
+static void br_multicast_add_router(struct net_bridge *br,
+ struct net_bridge_port *port)
+{
+ struct net_bridge_port *p;
+ struct hlist_node *slot = NULL;
+
+ if (!hlist_unhashed(&port->rlist))
+ return;
+
+ hlist_for_each_entry(p, &br->router_list, rlist) {
+ if ((unsigned long) port >= (unsigned long) p)
+ break;
+ slot = &p->rlist;
+ }
+
+ if (slot)
+ hlist_add_behind_rcu(&port->rlist, slot);
+ else
+ hlist_add_head_rcu(&port->rlist, &br->router_list);
+ br_rtr_notify(br->dev, port, RTM_NEWMDB);
+ br_port_mc_router_state_change(port, true);
+}
+
+static void br_multicast_mark_router(struct net_bridge *br,
+ struct net_bridge_port *port)
+{
+ unsigned long now = jiffies;
+
+ if (!port) {
+ if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
+ if (!timer_pending(&br->multicast_router_timer))
+ br_mc_router_state_change(br, true);
+ mod_timer(&br->multicast_router_timer,
+ now + br->multicast_querier_interval);
+ }
+ return;
+ }
+
+ if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
+ port->multicast_router == MDB_RTR_TYPE_PERM)
+ return;
+
+ br_multicast_add_router(br, port);
+
+ mod_timer(&port->multicast_router_timer,
+ now + br->multicast_querier_interval);
+}
+
+static void br_multicast_query_received(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct bridge_mcast_other_query *query,
+ struct br_ip *saddr,
+ unsigned long max_delay)
+{
+ if (!br_multicast_select_querier(br, port, saddr))
+ return;
+
+ br_multicast_update_query_timer(br, query, max_delay);
+
+ /* Based on RFC4541, section 2.1.1 IGMP Forwarding Rules,
+ * the arrival port for IGMP Queries where the source address
+ * is 0.0.0.0 should not be added to router port list.
+ */
+ if ((saddr->proto == htons(ETH_P_IP) && saddr->u.ip4) ||
+ saddr->proto == htons(ETH_P_IPV6))
+ br_multicast_mark_router(br, port);
+}
+
+static void br_ip4_multicast_query(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb,
+ u16 vid)
+{
+ const struct iphdr *iph = ip_hdr(skb);
+ struct igmphdr *ih = igmp_hdr(skb);
+ struct net_bridge_mdb_entry *mp;
+ struct igmpv3_query *ih3;
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group __rcu **pp;
+ struct br_ip saddr;
+ unsigned long max_delay;
+ unsigned long now = jiffies;
+ unsigned int offset = skb_transport_offset(skb);
+ __be32 group;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) ||
+ (port && port->state == BR_STATE_DISABLED))
+ goto out;
+
+ group = ih->group;
+
+ if (skb->len == offset + sizeof(*ih)) {
+ max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
+
+ if (!max_delay) {
+ max_delay = 10 * HZ;
+ group = 0;
+ }
+ } else if (skb->len >= offset + sizeof(*ih3)) {
+ ih3 = igmpv3_query_hdr(skb);
+ if (ih3->nsrcs)
+ goto out;
+
+ max_delay = ih3->code ?
+ IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
+ } else {
+ goto out;
+ }
+
+ if (!group) {
+ saddr.proto = htons(ETH_P_IP);
+ saddr.u.ip4 = iph->saddr;
+
+ br_multicast_query_received(br, port, &br->ip4_other_query,
+ &saddr, max_delay);
+ goto out;
+ }
+
+ mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
+ if (!mp)
+ goto out;
+
+ max_delay *= br->multicast_last_member_count;
+
+ if (mp->host_joined &&
+ (timer_pending(&mp->timer) ?
+ time_after(mp->timer.expires, now + max_delay) :
+ try_to_del_timer_sync(&mp->timer) >= 0))
+ mod_timer(&mp->timer, now + max_delay);
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (timer_pending(&p->timer) ?
+ time_after(p->timer.expires, now + max_delay) :
+ try_to_del_timer_sync(&p->timer) >= 0)
+ mod_timer(&p->timer, now + max_delay);
+ }
+
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_ip6_multicast_query(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb,
+ u16 vid)
+{
+ const struct ipv6hdr *ip6h = ipv6_hdr(skb);
+ struct mld_msg *mld;
+ struct net_bridge_mdb_entry *mp;
+ struct mld2_query *mld2q;
+ struct net_bridge_port_group *p;
+ struct net_bridge_port_group __rcu **pp;
+ struct br_ip saddr;
+ unsigned long max_delay;
+ unsigned long now = jiffies;
+ unsigned int offset = skb_transport_offset(skb);
+ const struct in6_addr *group = NULL;
+ bool is_general_query;
+ int err = 0;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) ||
+ (port && port->state == BR_STATE_DISABLED))
+ goto out;
+
+ if (skb->len == offset + sizeof(*mld)) {
+ if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
+ err = -EINVAL;
+ goto out;
+ }
+ mld = (struct mld_msg *) icmp6_hdr(skb);
+ max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
+ if (max_delay)
+ group = &mld->mld_mca;
+ } else {
+ if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
+ err = -EINVAL;
+ goto out;
+ }
+ mld2q = (struct mld2_query *)icmp6_hdr(skb);
+ if (!mld2q->mld2q_nsrcs)
+ group = &mld2q->mld2q_mca;
+
+ max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
+ }
+
+ is_general_query = group && ipv6_addr_any(group);
+
+ if (is_general_query) {
+ saddr.proto = htons(ETH_P_IPV6);
+ saddr.u.ip6 = ip6h->saddr;
+
+ br_multicast_query_received(br, port, &br->ip6_other_query,
+ &saddr, max_delay);
+ goto out;
+ } else if (!group) {
+ goto out;
+ }
+
+ mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
+ if (!mp)
+ goto out;
+
+ max_delay *= br->multicast_last_member_count;
+ if (mp->host_joined &&
+ (timer_pending(&mp->timer) ?
+ time_after(mp->timer.expires, now + max_delay) :
+ try_to_del_timer_sync(&mp->timer) >= 0))
+ mod_timer(&mp->timer, now + max_delay);
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (timer_pending(&p->timer) ?
+ time_after(p->timer.expires, now + max_delay) :
+ try_to_del_timer_sync(&p->timer) >= 0)
+ mod_timer(&p->timer, now + max_delay);
+ }
+
+out:
+ spin_unlock(&br->multicast_lock);
+ return err;
+}
+#endif
+
+static void
+br_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct br_ip *group,
+ struct bridge_mcast_other_query *other_query,
+ struct bridge_mcast_own_query *own_query,
+ const unsigned char *src)
+{
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_mdb_entry *mp;
+ struct net_bridge_port_group *p;
+ unsigned long now;
+ unsigned long time;
+
+ spin_lock(&br->multicast_lock);
+ if (!netif_running(br->dev) ||
+ (port && port->state == BR_STATE_DISABLED))
+ goto out;
+
+ mdb = mlock_dereference(br->mdb, br);
+ mp = br_mdb_ip_get(mdb, group);
+ if (!mp)
+ goto out;
+
+ if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
+ struct net_bridge_port_group __rcu **pp;
+
+ for (pp = &mp->ports;
+ (p = mlock_dereference(*pp, br)) != NULL;
+ pp = &p->next) {
+ if (!br_port_group_equal(p, port, src))
+ continue;
+
+ rcu_assign_pointer(*pp, p->next);
+ hlist_del_init(&p->mglist);
+ del_timer(&p->timer);
+ call_rcu_bh(&p->rcu, br_multicast_free_pg);
+ br_mdb_notify(br->dev, port, group, RTM_DELMDB,
+ p->flags);
+
+ if (!mp->ports && !mp->host_joined &&
+ netif_running(br->dev))
+ mod_timer(&mp->timer, jiffies);
+ }
+ goto out;
+ }
+
+ if (timer_pending(&other_query->timer))
+ goto out;
+
+ if (br->multicast_querier) {
+ __br_multicast_send_query(br, port, &mp->addr);
+
+ time = jiffies + br->multicast_last_member_count *
+ br->multicast_last_member_interval;
+
+ mod_timer(&own_query->timer, time);
+
+ for (p = mlock_dereference(mp->ports, br);
+ p != NULL;
+ p = mlock_dereference(p->next, br)) {
+ if (!br_port_group_equal(p, port, src))
+ continue;
+
+ if (!hlist_unhashed(&p->mglist) &&
+ (timer_pending(&p->timer) ?
+ time_after(p->timer.expires, time) :
+ try_to_del_timer_sync(&p->timer) >= 0)) {
+ mod_timer(&p->timer, time);
+ }
+
+ break;
+ }
+ }
+
+ now = jiffies;
+ time = now + br->multicast_last_member_count *
+ br->multicast_last_member_interval;
+
+ if (!port) {
+ if (mp->host_joined &&
+ (timer_pending(&mp->timer) ?
+ time_after(mp->timer.expires, time) :
+ try_to_del_timer_sync(&mp->timer) >= 0)) {
+ mod_timer(&mp->timer, time);
+ }
+
+ goto out;
+ }
+
+ for (p = mlock_dereference(mp->ports, br);
+ p != NULL;
+ p = mlock_dereference(p->next, br)) {
+ if (p->port != port)
+ continue;
+
+ if (!hlist_unhashed(&p->mglist) &&
+ (timer_pending(&p->timer) ?
+ time_after(p->timer.expires, time) :
+ try_to_del_timer_sync(&p->timer) >= 0)) {
+ mod_timer(&p->timer, time);
+ }
+
+ break;
+ }
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ __be32 group,
+ __u16 vid,
+ const unsigned char *src)
+{
+ struct br_ip br_group;
+ struct bridge_mcast_own_query *own_query;
+
+ if (ipv4_is_local_multicast(group))
+ return;
+
+ own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
+
+ br_group.u.ip4 = group;
+ br_group.proto = htons(ETH_P_IP);
+ br_group.vid = vid;
+
+ br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
+ own_query, src);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_leave_group(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct in6_addr *group,
+ __u16 vid,
+ const unsigned char *src)
+{
+ struct br_ip br_group;
+ struct bridge_mcast_own_query *own_query;
+
+ if (ipv6_addr_is_ll_all_nodes(group))
+ return;
+
+ own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
+
+ br_group.u.ip6 = *group;
+ br_group.proto = htons(ETH_P_IPV6);
+ br_group.vid = vid;
+
+ br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
+ own_query, src);
+}
+#endif
+
+static void br_multicast_err_count(const struct net_bridge *br,
+ const struct net_bridge_port *p,
+ __be16 proto)
+{
+ struct bridge_mcast_stats __percpu *stats;
+ struct bridge_mcast_stats *pstats;
+
+ if (!br->multicast_stats_enabled)
+ return;
+
+ if (p)
+ stats = p->mcast_stats;
+ else
+ stats = br->mcast_stats;
+ if (WARN_ON(!stats))
+ return;
+
+ pstats = this_cpu_ptr(stats);
+
+ u64_stats_update_begin(&pstats->syncp);
+ switch (proto) {
+ case htons(ETH_P_IP):
+ pstats->mstats.igmp_parse_errors++;
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ pstats->mstats.mld_parse_errors++;
+ break;
+#endif
+ }
+ u64_stats_update_end(&pstats->syncp);
+}
+
+static void br_multicast_pim(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct sk_buff *skb)
+{
+ unsigned int offset = skb_transport_offset(skb);
+ struct pimhdr *pimhdr, _pimhdr;
+
+ pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
+ if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
+ pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
+ return;
+
+ br_multicast_mark_router(br, port);
+}
+
+static int br_multicast_ipv4_rcv(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb,
+ u16 vid)
+{
+ struct sk_buff *skb_trimmed = NULL;
+ const unsigned char *src;
+ struct igmphdr *ih;
+ int err;
+
+ err = ip_mc_check_igmp(skb, &skb_trimmed);
+
+ if (err == -ENOMSG) {
+ if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
+ if (ip_hdr(skb)->protocol == IPPROTO_PIM)
+ br_multicast_pim(br, port, skb);
+ }
+ return 0;
+ } else if (err < 0) {
+ br_multicast_err_count(br, port, skb->protocol);
+ return err;
+ }
+
+ ih = igmp_hdr(skb);
+ src = eth_hdr(skb)->h_source;
+ BR_INPUT_SKB_CB(skb)->igmp = ih->type;
+
+ switch (ih->type) {
+ case IGMP_HOST_MEMBERSHIP_REPORT:
+ case IGMPV2_HOST_MEMBERSHIP_REPORT:
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
+ break;
+ case IGMPV3_HOST_MEMBERSHIP_REPORT:
+ err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
+ break;
+ case IGMP_HOST_MEMBERSHIP_QUERY:
+ br_ip4_multicast_query(br, port, skb_trimmed, vid);
+ break;
+ case IGMP_HOST_LEAVE_MESSAGE:
+ br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
+ break;
+ }
+
+ if (skb_trimmed && skb_trimmed != skb)
+ kfree_skb(skb_trimmed);
+
+ br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
+ BR_MCAST_DIR_RX);
+
+ return err;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int br_multicast_ipv6_rcv(struct net_bridge *br,
+ struct net_bridge_port *port,
+ struct sk_buff *skb,
+ u16 vid)
+{
+ struct sk_buff *skb_trimmed = NULL;
+ const unsigned char *src;
+ struct mld_msg *mld;
+ int err;
+
+ err = ipv6_mc_check_mld(skb, &skb_trimmed);
+
+ if (err == -ENOMSG) {
+ if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ return 0;
+ } else if (err < 0) {
+ br_multicast_err_count(br, port, skb->protocol);
+ return err;
+ }
+
+ mld = (struct mld_msg *)skb_transport_header(skb);
+ BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
+
+ switch (mld->mld_type) {
+ case ICMPV6_MGM_REPORT:
+ src = eth_hdr(skb)->h_source;
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
+ src);
+ break;
+ case ICMPV6_MLD2_REPORT:
+ err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
+ break;
+ case ICMPV6_MGM_QUERY:
+ err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
+ break;
+ case ICMPV6_MGM_REDUCTION:
+ src = eth_hdr(skb)->h_source;
+ br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
+ break;
+ }
+
+ if (skb_trimmed && skb_trimmed != skb)
+ kfree_skb(skb_trimmed);
+
+ br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
+ BR_MCAST_DIR_RX);
+
+ return err;
+}
+#endif
+
+int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
+ struct sk_buff *skb, u16 vid)
+{
+ int ret = 0;
+
+ BR_INPUT_SKB_CB(skb)->igmp = 0;
+ BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
+
+ if (br->multicast_disabled)
+ return 0;
+
+ switch (skb->protocol) {
+ case htons(ETH_P_IP):
+ ret = br_multicast_ipv4_rcv(br, port, skb, vid);
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ ret = br_multicast_ipv6_rcv(br, port, skb, vid);
+ break;
+#endif
+ }
+
+ return ret;
+}
+
+static void br_multicast_query_expired(struct net_bridge *br,
+ struct bridge_mcast_own_query *query,
+ struct bridge_mcast_querier *querier)
+{
+ spin_lock(&br->multicast_lock);
+ if (query->startup_sent < br->multicast_startup_query_count)
+ query->startup_sent++;
+
+ RCU_INIT_POINTER(querier->port, NULL);
+ br_multicast_send_query(br, NULL, query);
+ spin_unlock(&br->multicast_lock);
+}
+
+static void br_ip4_multicast_query_expired(struct timer_list *t)
+{
+ struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
+
+ br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void br_ip6_multicast_query_expired(struct timer_list *t)
+{
+ struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
+
+ br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
+}
+#endif
+
+void br_multicast_init(struct net_bridge *br)
+{
+ br->hash_elasticity = 4;
+ br->hash_max = 512;
+
+ br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+ br->multicast_querier = 0;
+ br->multicast_query_use_ifaddr = 0;
+ br->multicast_last_member_count = 2;
+ br->multicast_startup_query_count = 2;
+
+ br->multicast_last_member_interval = HZ;
+ br->multicast_query_response_interval = 10 * HZ;
+ br->multicast_startup_query_interval = 125 * HZ / 4;
+ br->multicast_query_interval = 125 * HZ;
+ br->multicast_querier_interval = 255 * HZ;
+ br->multicast_membership_interval = 260 * HZ;
+
+ br->ip4_other_query.delay_time = 0;
+ br->ip4_querier.port = NULL;
+ br->multicast_igmp_version = 2;
+#if IS_ENABLED(CONFIG_IPV6)
+ br->multicast_mld_version = 1;
+ br->ip6_other_query.delay_time = 0;
+ br->ip6_querier.port = NULL;
+#endif
+ br->has_ipv6_addr = 1;
+
+ spin_lock_init(&br->multicast_lock);
+ timer_setup(&br->multicast_router_timer,
+ br_multicast_local_router_expired, 0);
+ timer_setup(&br->ip4_other_query.timer,
+ br_ip4_multicast_querier_expired, 0);
+ timer_setup(&br->ip4_own_query.timer,
+ br_ip4_multicast_query_expired, 0);
+#if IS_ENABLED(CONFIG_IPV6)
+ timer_setup(&br->ip6_other_query.timer,
+ br_ip6_multicast_querier_expired, 0);
+ timer_setup(&br->ip6_own_query.timer,
+ br_ip6_multicast_query_expired, 0);
+#endif
+}
+
+static void __br_multicast_open(struct net_bridge *br,
+ struct bridge_mcast_own_query *query)
+{
+ query->startup_sent = 0;
+
+ if (br->multicast_disabled)
+ return;
+
+ mod_timer(&query->timer, jiffies);
+}
+
+void br_multicast_open(struct net_bridge *br)
+{
+ __br_multicast_open(br, &br->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+ __br_multicast_open(br, &br->ip6_own_query);
+#endif
+}
+
+void br_multicast_stop(struct net_bridge *br)
+{
+ del_timer_sync(&br->multicast_router_timer);
+ del_timer_sync(&br->ip4_other_query.timer);
+ del_timer_sync(&br->ip4_own_query.timer);
+#if IS_ENABLED(CONFIG_IPV6)
+ del_timer_sync(&br->ip6_other_query.timer);
+ del_timer_sync(&br->ip6_own_query.timer);
+#endif
+}
+
+void br_multicast_dev_del(struct net_bridge *br)
+{
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_mdb_entry *mp;
+ struct hlist_node *n;
+ u32 ver;
+ int i;
+
+ spin_lock_bh(&br->multicast_lock);
+ mdb = mlock_dereference(br->mdb, br);
+ if (!mdb)
+ goto out;
+
+ br->mdb = NULL;
+
+ ver = mdb->ver;
+ for (i = 0; i < mdb->max; i++) {
+ hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
+ hlist[ver]) {
+ del_timer(&mp->timer);
+ call_rcu_bh(&mp->rcu, br_multicast_free_group);
+ }
+ }
+
+ if (mdb->old) {
+ spin_unlock_bh(&br->multicast_lock);
+ rcu_barrier_bh();
+ spin_lock_bh(&br->multicast_lock);
+ WARN_ON(mdb->old);
+ }
+
+ mdb->old = mdb;
+ call_rcu_bh(&mdb->rcu, br_mdb_free);
+
+out:
+ spin_unlock_bh(&br->multicast_lock);
+}
+
+int br_multicast_set_router(struct net_bridge *br, unsigned long val)
+{
+ int err = -EINVAL;
+
+ spin_lock_bh(&br->multicast_lock);
+
+ switch (val) {
+ case MDB_RTR_TYPE_DISABLED:
+ case MDB_RTR_TYPE_PERM:
+ br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
+ del_timer(&br->multicast_router_timer);
+ br->multicast_router = val;
+ err = 0;
+ break;
+ case MDB_RTR_TYPE_TEMP_QUERY:
+ if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
+ br_mc_router_state_change(br, false);
+ br->multicast_router = val;
+ err = 0;
+ break;
+ }
+
+ spin_unlock_bh(&br->multicast_lock);
+
+ return err;
+}
+
+static void __del_port_router(struct net_bridge_port *p)
+{
+ if (hlist_unhashed(&p->rlist))
+ return;
+ hlist_del_init_rcu(&p->rlist);
+ br_rtr_notify(p->br->dev, p, RTM_DELMDB);
+ br_port_mc_router_state_change(p, false);
+
+ /* don't allow timer refresh */
+ if (p->multicast_router == MDB_RTR_TYPE_TEMP)
+ p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+}
+
+int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
+{
+ struct net_bridge *br = p->br;
+ unsigned long now = jiffies;
+ int err = -EINVAL;
+
+ spin_lock(&br->multicast_lock);
+ if (p->multicast_router == val) {
+ /* Refresh the temp router port timer */
+ if (p->multicast_router == MDB_RTR_TYPE_TEMP)
+ mod_timer(&p->multicast_router_timer,
+ now + br->multicast_querier_interval);
+ err = 0;
+ goto unlock;
+ }
+ switch (val) {
+ case MDB_RTR_TYPE_DISABLED:
+ p->multicast_router = MDB_RTR_TYPE_DISABLED;
+ __del_port_router(p);
+ del_timer(&p->multicast_router_timer);
+ break;
+ case MDB_RTR_TYPE_TEMP_QUERY:
+ p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
+ __del_port_router(p);
+ break;
+ case MDB_RTR_TYPE_PERM:
+ p->multicast_router = MDB_RTR_TYPE_PERM;
+ del_timer(&p->multicast_router_timer);
+ br_multicast_add_router(br, p);
+ break;
+ case MDB_RTR_TYPE_TEMP:
+ p->multicast_router = MDB_RTR_TYPE_TEMP;
+ br_multicast_mark_router(br, p);
+ break;
+ default:
+ goto unlock;
+ }
+ err = 0;
+unlock:
+ spin_unlock(&br->multicast_lock);
+
+ return err;
+}
+
+static void br_multicast_start_querier(struct net_bridge *br,
+ struct bridge_mcast_own_query *query)
+{
+ struct net_bridge_port *port;
+
+ __br_multicast_open(br, query);
+
+ list_for_each_entry(port, &br->port_list, list) {
+ if (port->state == BR_STATE_DISABLED ||
+ port->state == BR_STATE_BLOCKING)
+ continue;
+
+ if (query == &br->ip4_own_query)
+ br_multicast_enable(&port->ip4_own_query);
+#if IS_ENABLED(CONFIG_IPV6)
+ else
+ br_multicast_enable(&port->ip6_own_query);
+#endif
+ }
+}
+
+int br_multicast_toggle(struct net_bridge *br, unsigned long val)
+{
+ struct net_bridge_mdb_htable *mdb;
+ struct net_bridge_port *port;
+ int err = 0;
+
+ spin_lock_bh(&br->multicast_lock);
+ if (br->multicast_disabled == !val)
+ goto unlock;
+
+ br_mc_disabled_update(br->dev, !val);
+ br->multicast_disabled = !val;
+ if (br->multicast_disabled)
+ goto unlock;
+
+ if (!netif_running(br->dev))
+ goto unlock;
+
+ mdb = mlock_dereference(br->mdb, br);
+ if (mdb) {
+ if (mdb->old) {
+ err = -EEXIST;
+rollback:
+ br->multicast_disabled = !!val;
+ goto unlock;
+ }
+
+ err = br_mdb_rehash(&br->mdb, mdb->max,
+ br->hash_elasticity);
+ if (err)
+ goto rollback;
+ }
+
+ br_multicast_open(br);
+ list_for_each_entry(port, &br->port_list, list)
+ __br_multicast_enable_port(port);
+
+unlock:
+ spin_unlock_bh(&br->multicast_lock);
+
+ return err;
+}
+
+bool br_multicast_enabled(const struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+
+ return !br->multicast_disabled;
+}
+EXPORT_SYMBOL_GPL(br_multicast_enabled);
+
+bool br_multicast_router(const struct net_device *dev)
+{
+ struct net_bridge *br = netdev_priv(dev);
+ bool is_router;
+
+ spin_lock_bh(&br->multicast_lock);
+ is_router = br_multicast_is_router(br);
+ spin_unlock_bh(&br->multicast_lock);
+ return is_router;
+}
+EXPORT_SYMBOL_GPL(br_multicast_router);
+
+int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
+{
+ unsigned long max_delay;
+
+ val = !!val;
+
+ spin_lock_bh(&br->multicast_lock);
+ if (br->multicast_querier == val)
+ goto unlock;
+
+ br->multicast_querier = val;
+ if (!val)
+ goto unlock;
+
+ max_delay = br->multicast_query_response_interval;
+
+ if (!timer_pending(&br->ip4_other_query.timer))
+ br->ip4_other_query.delay_time = jiffies + max_delay;
+
+ br_multicast_start_querier(br, &br->ip4_own_query);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (!timer_pending(&br->ip6_other_query.timer))
+ br->ip6_other_query.delay_time = jiffies + max_delay;
+
+ br_multicast_start_querier(br, &br->ip6_own_query);
+#endif
+
+unlock:
+ spin_unlock_bh(&br->multicast_lock);
+
+ return 0;
+}
+
+int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
+{
+ int err = -EINVAL;
+ u32 old;
+ struct net_bridge_mdb_htable *mdb;
+
+ spin_lock_bh(&br->multicast_lock);
+ if (!is_power_of_2(val))
+ goto unlock;
+
+ mdb = mlock_dereference(br->mdb, br);
+ if (mdb && val < mdb->size)
+ goto unlock;
+
+ err = 0;
+
+ old = br->hash_max;
+ br->hash_max = val;
+
+ if (mdb) {
+ if (mdb->old) {
+ err = -EEXIST;
+rollback:
+ br->hash_max = old;
+ goto unlock;
+ }
+
+ err = br_mdb_rehash(&br->mdb, br->hash_max,
+ br->hash_elasticity);
+ if (err)
+ goto rollback;
+ }
+
+unlock:
+ spin_unlock_bh(&br->multicast_lock);
+
+ return err;
+}
+
+int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
+{
+ /* Currently we support only version 2 and 3 */
+ switch (val) {
+ case 2:
+ case 3:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_bh(&br->multicast_lock);
+ br->multicast_igmp_version = val;
+ spin_unlock_bh(&br->multicast_lock);
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
+{
+ /* Currently we support version 1 and 2 */
+ switch (val) {
+ case 1:
+ case 2:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ spin_lock_bh(&br->multicast_lock);
+ br->multicast_mld_version = val;
+ spin_unlock_bh(&br->multicast_lock);
+
+ return 0;
+}
+#endif
+
+/**
+ * br_multicast_list_adjacent - Returns snooped multicast addresses
+ * @dev: The bridge port adjacent to which to retrieve addresses
+ * @br_ip_list: The list to store found, snooped multicast IP addresses in
+ *
+ * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
+ * snooping feature on all bridge ports of dev's bridge device, excluding
+ * the addresses from dev itself.
+ *
+ * Returns the number of items added to br_ip_list.
+ *
+ * Notes:
+ * - br_ip_list needs to be initialized by caller
+ * - br_ip_list might contain duplicates in the end
+ * (needs to be taken care of by caller)
+ * - br_ip_list needs to be freed by caller
+ */
+int br_multicast_list_adjacent(struct net_device *dev,
+ struct list_head *br_ip_list)
+{
+ struct net_bridge *br;
+ struct net_bridge_port *port;
+ struct net_bridge_port_group *group;
+ struct br_ip_list *entry;
+ int count = 0;
+
+ rcu_read_lock();
+ if (!br_ip_list || !br_port_exists(dev))
+ goto unlock;
+
+ port = br_port_get_rcu(dev);
+ if (!port || !port->br)
+ goto unlock;
+
+ br = port->br;
+
+ list_for_each_entry_rcu(port, &br->port_list, list) {
+ if (!port->dev || port->dev == dev)
+ continue;
+
+ hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
+ entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
+ if (!entry)
+ goto unlock;
+
+ entry->addr = group->addr;
+ list_add(&entry->list, br_ip_list);
+ count++;
+ }
+ }
+
+unlock:
+ rcu_read_unlock();
+ return count;
+}
+EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
+
+/**
+ * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
+ * @dev: The bridge port providing the bridge on which to check for a querier
+ * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
+ *
+ * Checks whether the given interface has a bridge on top and if so returns
+ * true if a valid querier exists anywhere on the bridged link layer.
+ * Otherwise returns false.
+ */
+bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
+{
+ struct net_bridge *br;
+ struct net_bridge_port *port;
+ struct ethhdr eth;
+ bool ret = false;
+
+ rcu_read_lock();
+ if (!br_port_exists(dev))
+ goto unlock;
+
+ port = br_port_get_rcu(dev);
+ if (!port || !port->br)
+ goto unlock;
+
+ br = port->br;
+
+ memset(ð, 0, sizeof(eth));
+ eth.h_proto = htons(proto);
+
+ ret = br_multicast_querier_exists(br, ð);
+
+unlock:
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
+
+/**
+ * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
+ * @dev: The bridge port adjacent to which to check for a querier
+ * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
+ *
+ * Checks whether the given interface has a bridge on top and if so returns
+ * true if a selected querier is behind one of the other ports of this
+ * bridge. Otherwise returns false.
+ */
+bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
+{
+ struct net_bridge *br;
+ struct net_bridge_port *port;
+ bool ret = false;
+
+ rcu_read_lock();
+ if (!br_port_exists(dev))
+ goto unlock;
+
+ port = br_port_get_rcu(dev);
+ if (!port || !port->br)
+ goto unlock;
+
+ br = port->br;
+
+ switch (proto) {
+ case ETH_P_IP:
+ if (!timer_pending(&br->ip4_other_query.timer) ||
+ rcu_dereference(br->ip4_querier.port) == port)
+ goto unlock;
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case ETH_P_IPV6:
+ if (!timer_pending(&br->ip6_other_query.timer) ||
+ rcu_dereference(br->ip6_querier.port) == port)
+ goto unlock;
+ break;
+#endif
+ default:
+ goto unlock;
+ }
+
+ ret = true;
+unlock:
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
+
+static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
+ const struct sk_buff *skb, u8 type, u8 dir)
+{
+ struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
+ __be16 proto = skb->protocol;
+ unsigned int t_len;
+
+ u64_stats_update_begin(&pstats->syncp);
+ switch (proto) {
+ case htons(ETH_P_IP):
+ t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
+ switch (type) {
+ case IGMP_HOST_MEMBERSHIP_REPORT:
+ pstats->mstats.igmp_v1reports[dir]++;
+ break;
+ case IGMPV2_HOST_MEMBERSHIP_REPORT:
+ pstats->mstats.igmp_v2reports[dir]++;
+ break;
+ case IGMPV3_HOST_MEMBERSHIP_REPORT:
+ pstats->mstats.igmp_v3reports[dir]++;
+ break;
+ case IGMP_HOST_MEMBERSHIP_QUERY:
+ if (t_len != sizeof(struct igmphdr)) {
+ pstats->mstats.igmp_v3queries[dir]++;
+ } else {
+ unsigned int offset = skb_transport_offset(skb);
+ struct igmphdr *ih, _ihdr;
+
+ ih = skb_header_pointer(skb, offset,
+ sizeof(_ihdr), &_ihdr);
+ if (!ih)
+ break;
+ if (!ih->code)
+ pstats->mstats.igmp_v1queries[dir]++;
+ else
+ pstats->mstats.igmp_v2queries[dir]++;
+ }
+ break;
+ case IGMP_HOST_LEAVE_MESSAGE:
+ pstats->mstats.igmp_leaves[dir]++;
+ break;
+ }
+ break;
+#if IS_ENABLED(CONFIG_IPV6)
+ case htons(ETH_P_IPV6):
+ t_len = ntohs(ipv6_hdr(skb)->payload_len) +
+ sizeof(struct ipv6hdr);
+ t_len -= skb_network_header_len(skb);
+ switch (type) {
+ case ICMPV6_MGM_REPORT:
+ pstats->mstats.mld_v1reports[dir]++;
+ break;
+ case ICMPV6_MLD2_REPORT:
+ pstats->mstats.mld_v2reports[dir]++;
+ break;
+ case ICMPV6_MGM_QUERY:
+ if (t_len != sizeof(struct mld_msg))
+ pstats->mstats.mld_v2queries[dir]++;
+ else
+ pstats->mstats.mld_v1queries[dir]++;
+ break;
+ case ICMPV6_MGM_REDUCTION:
+ pstats->mstats.mld_leaves[dir]++;
+ break;
+ }
+ break;
+#endif /* CONFIG_IPV6 */
+ }
+ u64_stats_update_end(&pstats->syncp);
+}
+
+void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
+ const struct sk_buff *skb, u8 type, u8 dir)
+{
+ struct bridge_mcast_stats __percpu *stats;
+
+ /* if multicast_disabled is true then igmp type can't be set */
+ if (!type || !br->multicast_stats_enabled)
+ return;
+
+ if (p)
+ stats = p->mcast_stats;
+ else
+ stats = br->mcast_stats;
+ if (WARN_ON(!stats))
+ return;
+
+ br_mcast_stats_add(stats, skb, type, dir);
+}
+
+int br_multicast_init_stats(struct net_bridge *br)
+{
+ br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
+ if (!br->mcast_stats)
+ return -ENOMEM;
+
+ return 0;
+}
+
+void br_multicast_uninit_stats(struct net_bridge *br)
+{
+ free_percpu(br->mcast_stats);
+}
+
+static void mcast_stats_add_dir(u64 *dst, u64 *src)
+{
+ dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
+ dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
+}
+
+void br_multicast_get_stats(const struct net_bridge *br,
+ const struct net_bridge_port *p,
+ struct br_mcast_stats *dest)
+{
+ struct bridge_mcast_stats __percpu *stats;
+ struct br_mcast_stats tdst;
+ int i;
+
+ memset(dest, 0, sizeof(*dest));
+ if (p)
+ stats = p->mcast_stats;
+ else
+ stats = br->mcast_stats;
+ if (WARN_ON(!stats))
+ return;
+
+ memset(&tdst, 0, sizeof(tdst));
+ for_each_possible_cpu(i) {
+ struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
+ struct br_mcast_stats temp;
+ unsigned int start;
+
+ do {
+ start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
+ memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
+ } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
+
+ mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
+ mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
+ mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
+ mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
+ mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
+ mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
+ mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
+ tdst.igmp_parse_errors += temp.igmp_parse_errors;
+
+ mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
+ mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
+ mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
+ mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
+ mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
+ tdst.mld_parse_errors += temp.mld_parse_errors;
+ }
+ memcpy(dest, &tdst, sizeof(*dest));
+}