| /* |
| * 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/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 <net/ip.h> |
| #if IS_ENABLED(CONFIG_IPV6) |
| #include <net/ipv6.h> |
| #include <net/mld.h> |
| #include <net/ip6_checksum.h> |
| #endif |
| |
| #include "br_private.h" |
| |
| static void br_multicast_start_querier(struct net_bridge *br); |
| 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(unsigned long data) |
| { |
| struct net_bridge_mdb_entry *mp = (void *)data; |
| 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->mglist = false; |
| |
| 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); |
| call_rcu_bh(&p->rcu, br_multicast_free_pg); |
| |
| if (!mp->ports && !mp->mglist && mp->timer_armed && |
| netif_running(br->dev)) |
| mod_timer(&mp->timer, jiffies); |
| |
| return; |
| } |
| |
| WARN_ON(1); |
| } |
| |
| static void br_multicast_port_group_expired(unsigned long data) |
| { |
| struct net_bridge_port_group *pg = (void *)data; |
| 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->state & MDB_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 = kzalloc(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) |
| { |
| struct sk_buff *skb; |
| struct igmphdr *ih; |
| struct ethhdr *eth; |
| struct iphdr *iph; |
| |
| skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) + |
| sizeof(*ih) + 4); |
| if (!skb) |
| goto out; |
| |
| skb->protocol = htons(ETH_P_IP); |
| |
| skb_reset_mac_header(skb); |
| eth = eth_hdr(skb); |
| |
| memcpy(eth->h_source, br->dev->dev_addr, 6); |
| 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) + sizeof(*ih) + 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); |
| 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(struct igmphdr)); |
| skb_put(skb, sizeof(*ih)); |
| |
| __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 *group) |
| { |
| struct sk_buff *skb; |
| struct ipv6hdr *ip6h; |
| struct mld_msg *mldq; |
| struct ethhdr *eth; |
| u8 *hopopt; |
| unsigned long interval; |
| |
| skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) + |
| 8 + sizeof(*mldq)); |
| if (!skb) |
| goto out; |
| |
| skb->protocol = htons(ETH_P_IPV6); |
| |
| /* Ethernet header */ |
| skb_reset_mac_header(skb); |
| eth = eth_hdr(skb); |
| |
| memcpy(eth->h_source, br->dev->dev_addr, 6); |
| 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 + sizeof(*mldq)); |
| 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); |
| return NULL; |
| } |
| 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); |
| mldq = (struct mld_msg *) icmp6_hdr(skb); |
| |
| interval = ipv6_addr_any(group) ? |
| br->multicast_query_response_interval : |
| br->multicast_last_member_interval; |
| |
| 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 = *group; |
| |
| /* checksum */ |
| mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
| sizeof(*mldq), IPPROTO_ICMPV6, |
| csum_partial(mldq, |
| sizeof(*mldq), 0)); |
| skb_put(skb, sizeof(*mldq)); |
| |
| __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) |
| { |
| switch (addr->proto) { |
| case htons(ETH_P_IP): |
| return br_ip4_multicast_alloc_query(br, addr->u.ip4); |
| #if IS_ENABLED(CONFIG_IPV6) |
| case htons(ETH_P_IPV6): |
| return br_ip6_multicast_alloc_query(br, &addr->u.ip6); |
| #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 *port, 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, port, 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; |
| |
| setup_timer(&mp->timer, br_multicast_group_expired, |
| (unsigned long)mp); |
| |
| 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 state) |
| { |
| struct net_bridge_port_group *p; |
| |
| p = kzalloc(sizeof(*p), GFP_ATOMIC); |
| if (unlikely(!p)) |
| return NULL; |
| |
| p->addr = *group; |
| p->port = port; |
| p->state = state; |
| rcu_assign_pointer(p->next, next); |
| hlist_add_head(&p->mglist, &port->mglist); |
| setup_timer(&p->timer, br_multicast_port_group_expired, |
| (unsigned long)p); |
| return p; |
| } |
| |
| static int br_multicast_add_group(struct net_bridge *br, |
| struct net_bridge_port *port, |
| struct br_ip *group) |
| { |
| struct net_bridge_mdb_entry *mp; |
| struct net_bridge_port_group *p; |
| struct net_bridge_port_group __rcu **pp; |
| 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) { |
| mp->mglist = true; |
| goto out; |
| } |
| |
| for (pp = &mp->ports; |
| (p = mlock_dereference(*pp, br)) != NULL; |
| pp = &p->next) { |
| if (p->port == port) |
| goto out; |
| if ((unsigned long)p->port < (unsigned long)port) |
| break; |
| } |
| |
| p = br_multicast_new_port_group(port, group, *pp, MDB_TEMPORARY); |
| if (unlikely(!p)) |
| goto err; |
| rcu_assign_pointer(*pp, p); |
| br_mdb_notify(br->dev, port, group, RTM_NEWMDB); |
| |
| 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) |
| { |
| 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); |
| } |
| |
| #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) |
| { |
| struct br_ip br_group; |
| |
| if (!ipv6_is_transient_multicast(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); |
| } |
| #endif |
| |
| static void br_multicast_router_expired(unsigned long data) |
| { |
| struct net_bridge_port *port = (void *)data; |
| struct net_bridge *br = port->br; |
| |
| spin_lock(&br->multicast_lock); |
| if (port->multicast_router != 1 || |
| timer_pending(&port->multicast_router_timer) || |
| hlist_unhashed(&port->rlist)) |
| goto out; |
| |
| hlist_del_init_rcu(&port->rlist); |
| |
| out: |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| static void br_multicast_local_router_expired(unsigned long data) |
| { |
| } |
| |
| static void br_multicast_querier_expired(unsigned long data) |
| { |
| struct net_bridge *br = (void *)data; |
| |
| spin_lock(&br->multicast_lock); |
| if (!netif_running(br->dev) || br->multicast_disabled) |
| goto out; |
| |
| br_multicast_start_querier(br); |
| |
| out: |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| static void __br_multicast_send_query(struct net_bridge *br, |
| struct net_bridge_port *port, |
| struct br_ip *ip) |
| { |
| struct sk_buff *skb; |
| |
| skb = br_multicast_alloc_query(br, ip); |
| if (!skb) |
| return; |
| |
| if (port) { |
| __skb_push(skb, sizeof(struct ethhdr)); |
| skb->dev = port->dev; |
| NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, |
| dev_queue_xmit); |
| } else |
| netif_rx(skb); |
| } |
| |
| static void br_multicast_send_query(struct net_bridge *br, |
| struct net_bridge_port *port, u32 sent) |
| { |
| unsigned long time; |
| struct br_ip br_group; |
| |
| if (!netif_running(br->dev) || br->multicast_disabled || |
| !br->multicast_querier || |
| timer_pending(&br->multicast_querier_timer)) |
| return; |
| |
| memset(&br_group.u, 0, sizeof(br_group.u)); |
| |
| br_group.proto = htons(ETH_P_IP); |
| __br_multicast_send_query(br, port, &br_group); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| br_group.proto = htons(ETH_P_IPV6); |
| __br_multicast_send_query(br, port, &br_group); |
| #endif |
| |
| time = jiffies; |
| time += sent < br->multicast_startup_query_count ? |
| br->multicast_startup_query_interval : |
| br->multicast_query_interval; |
| mod_timer(port ? &port->multicast_query_timer : |
| &br->multicast_query_timer, time); |
| } |
| |
| static void br_multicast_port_query_expired(unsigned long data) |
| { |
| struct net_bridge_port *port = (void *)data; |
| 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 (port->multicast_startup_queries_sent < |
| br->multicast_startup_query_count) |
| port->multicast_startup_queries_sent++; |
| |
| br_multicast_send_query(port->br, port, |
| port->multicast_startup_queries_sent); |
| |
| out: |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| void br_multicast_add_port(struct net_bridge_port *port) |
| { |
| port->multicast_router = 1; |
| |
| setup_timer(&port->multicast_router_timer, br_multicast_router_expired, |
| (unsigned long)port); |
| setup_timer(&port->multicast_query_timer, |
| br_multicast_port_query_expired, (unsigned long)port); |
| } |
| |
| void br_multicast_del_port(struct net_bridge_port *port) |
| { |
| del_timer_sync(&port->multicast_router_timer); |
| } |
| |
| static void __br_multicast_enable_port(struct net_bridge_port *port) |
| { |
| port->multicast_startup_queries_sent = 0; |
| |
| if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 || |
| del_timer(&port->multicast_query_timer)) |
| mod_timer(&port->multicast_query_timer, jiffies); |
| } |
| |
| void br_multicast_enable_port(struct net_bridge_port *port) |
| { |
| struct net_bridge *br = port->br; |
| |
| spin_lock(&br->multicast_lock); |
| if (br->multicast_disabled || !netif_running(br->dev)) |
| goto out; |
| |
| __br_multicast_enable_port(port); |
| |
| out: |
| 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) |
| br_multicast_del_pg(br, pg); |
| |
| if (!hlist_unhashed(&port->rlist)) |
| hlist_del_init_rcu(&port->rlist); |
| del_timer(&port->multicast_router_timer); |
| del_timer(&port->multicast_query_timer); |
| 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) |
| { |
| struct igmpv3_report *ih; |
| struct igmpv3_grec *grec; |
| int i; |
| int len; |
| int num; |
| int type; |
| int err = 0; |
| __be32 group; |
| u16 vid = 0; |
| |
| if (!pskb_may_pull(skb, sizeof(*ih))) |
| return -EINVAL; |
| |
| br_vlan_get_tag(skb, &vid); |
| ih = igmpv3_report_hdr(skb); |
| num = ntohs(ih->ngrec); |
| len = 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; |
| } |
| |
| err = br_ip4_multicast_add_group(br, port, group, vid); |
| 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) |
| { |
| struct icmp6hdr *icmp6h; |
| struct mld2_grec *grec; |
| int i; |
| int len; |
| int num; |
| int err = 0; |
| u16 vid = 0; |
| |
| if (!pskb_may_pull(skb, sizeof(*icmp6h))) |
| return -EINVAL; |
| |
| br_vlan_get_tag(skb, &vid); |
| icmp6h = icmp6_hdr(skb); |
| num = ntohs(icmp6h->icmp6_dataun.un_data16[1]); |
| len = 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; |
| } |
| |
| err = br_ip6_multicast_add_group(br, port, &grec->grec_mca, |
| vid); |
| if (!err) |
| break; |
| } |
| |
| return err; |
| } |
| #endif |
| |
| static void br_multicast_update_querier_timer(struct net_bridge *br, |
| unsigned long max_delay) |
| { |
| if (!timer_pending(&br->multicast_querier_timer)) |
| br->multicast_querier_delay_time = jiffies + max_delay; |
| |
| mod_timer(&br->multicast_querier_timer, |
| jiffies + br->multicast_querier_interval); |
| } |
| |
| /* |
| * 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; |
| |
| hlist_for_each_entry(p, &br->router_list, rlist) { |
| if ((unsigned long) port >= (unsigned long) p) |
| break; |
| slot = &p->rlist; |
| } |
| |
| if (slot) |
| hlist_add_after_rcu(slot, &port->rlist); |
| else |
| hlist_add_head_rcu(&port->rlist, &br->router_list); |
| } |
| |
| 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 == 1) |
| mod_timer(&br->multicast_router_timer, |
| now + br->multicast_querier_interval); |
| return; |
| } |
| |
| if (port->multicast_router != 1) |
| return; |
| |
| if (!hlist_unhashed(&port->rlist)) |
| goto timer; |
| |
| br_multicast_add_router(br, port); |
| |
| timer: |
| 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, |
| int saddr, |
| unsigned long max_delay) |
| { |
| if (saddr) |
| br_multicast_update_querier_timer(br, max_delay); |
| else if (timer_pending(&br->multicast_querier_timer)) |
| return; |
| |
| br_multicast_mark_router(br, port); |
| } |
| |
| static int br_ip4_multicast_query(struct net_bridge *br, |
| struct net_bridge_port *port, |
| struct sk_buff *skb) |
| { |
| 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; |
| unsigned long max_delay; |
| unsigned long now = jiffies; |
| __be32 group; |
| int err = 0; |
| u16 vid = 0; |
| |
| spin_lock(&br->multicast_lock); |
| if (!netif_running(br->dev) || |
| (port && port->state == BR_STATE_DISABLED)) |
| goto out; |
| |
| group = ih->group; |
| |
| if (skb->len == sizeof(*ih)) { |
| max_delay = ih->code * (HZ / IGMP_TIMER_SCALE); |
| |
| if (!max_delay) { |
| max_delay = 10 * HZ; |
| group = 0; |
| } |
| } else { |
| if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| ih3 = igmpv3_query_hdr(skb); |
| if (ih3->nsrcs) |
| goto out; |
| |
| max_delay = ih3->code ? |
| IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1; |
| } |
| |
| br_multicast_query_received(br, port, !!iph->saddr, max_delay); |
| |
| if (!group) |
| goto out; |
| |
| br_vlan_get_tag(skb, &vid); |
| mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid); |
| if (!mp) |
| goto out; |
| |
| mod_timer(&mp->timer, now + br->multicast_membership_interval); |
| mp->timer_armed = true; |
| |
| max_delay *= br->multicast_last_member_count; |
| |
| if (mp->mglist && |
| (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; |
| } |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int br_ip6_multicast_query(struct net_bridge *br, |
| struct net_bridge_port *port, |
| struct sk_buff *skb) |
| { |
| 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; |
| unsigned long max_delay; |
| unsigned long now = jiffies; |
| const struct in6_addr *group = NULL; |
| int err = 0; |
| u16 vid = 0; |
| |
| spin_lock(&br->multicast_lock); |
| if (!netif_running(br->dev) || |
| (port && port->state == BR_STATE_DISABLED)) |
| goto out; |
| |
| if (skb->len == sizeof(*mld)) { |
| if (!pskb_may_pull(skb, 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, 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); |
| } |
| |
| br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr), |
| max_delay); |
| |
| if (!group) |
| goto out; |
| |
| br_vlan_get_tag(skb, &vid); |
| mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid); |
| if (!mp) |
| goto out; |
| |
| mod_timer(&mp->timer, now + br->multicast_membership_interval); |
| mp->timer_armed = true; |
| |
| max_delay *= br->multicast_last_member_count; |
| if (mp->mglist && |
| (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 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) || |
| timer_pending(&br->multicast_querier_timer)) |
| goto out; |
| |
| mdb = mlock_dereference(br->mdb, br); |
| mp = br_mdb_ip_get(mdb, group); |
| if (!mp) |
| goto out; |
| |
| if (br->multicast_querier && |
| !timer_pending(&br->multicast_querier_timer)) { |
| __br_multicast_send_query(br, port, &mp->addr); |
| |
| time = jiffies + br->multicast_last_member_count * |
| br->multicast_last_member_interval; |
| mod_timer(port ? &port->multicast_query_timer : |
| &br->multicast_query_timer, time); |
| |
| 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; |
| } |
| } |
| |
| 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 (p->port != port) |
| 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); |
| |
| if (!mp->ports && !mp->mglist && mp->timer_armed && |
| netif_running(br->dev)) |
| mod_timer(&mp->timer, jiffies); |
| } |
| goto out; |
| } |
| |
| now = jiffies; |
| time = now + br->multicast_last_member_count * |
| br->multicast_last_member_interval; |
| |
| if (!port) { |
| if (mp->mglist && mp->timer_armed && |
| (timer_pending(&mp->timer) ? |
| time_after(mp->timer.expires, time) : |
| try_to_del_timer_sync(&mp->timer) >= 0)) { |
| mod_timer(&mp->timer, time); |
| } |
| } |
| |
| 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) |
| { |
| struct br_ip br_group; |
| |
| if (ipv4_is_local_multicast(group)) |
| return; |
| |
| br_group.u.ip4 = group; |
| br_group.proto = htons(ETH_P_IP); |
| br_group.vid = vid; |
| |
| br_multicast_leave_group(br, port, &br_group); |
| } |
| |
| #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) |
| { |
| struct br_ip br_group; |
| |
| if (!ipv6_is_transient_multicast(group)) |
| return; |
| |
| br_group.u.ip6 = *group; |
| br_group.proto = htons(ETH_P_IPV6); |
| br_group.vid = vid; |
| |
| br_multicast_leave_group(br, port, &br_group); |
| } |
| #endif |
| |
| static int br_multicast_ipv4_rcv(struct net_bridge *br, |
| struct net_bridge_port *port, |
| struct sk_buff *skb) |
| { |
| struct sk_buff *skb2 = skb; |
| const struct iphdr *iph; |
| struct igmphdr *ih; |
| unsigned int len; |
| unsigned int offset; |
| int err; |
| u16 vid = 0; |
| |
| /* We treat OOM as packet loss for now. */ |
| if (!pskb_may_pull(skb, sizeof(*iph))) |
| return -EINVAL; |
| |
| iph = ip_hdr(skb); |
| |
| if (iph->ihl < 5 || iph->version != 4) |
| return -EINVAL; |
| |
| if (!pskb_may_pull(skb, ip_hdrlen(skb))) |
| return -EINVAL; |
| |
| iph = ip_hdr(skb); |
| |
| if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| return -EINVAL; |
| |
| if (iph->protocol != IPPROTO_IGMP) { |
| if (!ipv4_is_local_multicast(iph->daddr)) |
| BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
| return 0; |
| } |
| |
| len = ntohs(iph->tot_len); |
| if (skb->len < len || len < ip_hdrlen(skb)) |
| return -EINVAL; |
| |
| if (skb->len > len) { |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (!skb2) |
| return -ENOMEM; |
| |
| err = pskb_trim_rcsum(skb2, len); |
| if (err) |
| goto err_out; |
| } |
| |
| len -= ip_hdrlen(skb2); |
| offset = skb_network_offset(skb2) + ip_hdrlen(skb2); |
| __skb_pull(skb2, offset); |
| skb_reset_transport_header(skb2); |
| |
| err = -EINVAL; |
| if (!pskb_may_pull(skb2, sizeof(*ih))) |
| goto out; |
| |
| switch (skb2->ip_summed) { |
| case CHECKSUM_COMPLETE: |
| if (!csum_fold(skb2->csum)) |
| break; |
| /* fall through */ |
| case CHECKSUM_NONE: |
| skb2->csum = 0; |
| if (skb_checksum_complete(skb2)) |
| goto out; |
| } |
| |
| err = 0; |
| |
| br_vlan_get_tag(skb2, &vid); |
| BR_INPUT_SKB_CB(skb)->igmp = 1; |
| ih = igmp_hdr(skb2); |
| |
| 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); |
| break; |
| case IGMPV3_HOST_MEMBERSHIP_REPORT: |
| err = br_ip4_multicast_igmp3_report(br, port, skb2); |
| break; |
| case IGMP_HOST_MEMBERSHIP_QUERY: |
| err = br_ip4_multicast_query(br, port, skb2); |
| break; |
| case IGMP_HOST_LEAVE_MESSAGE: |
| br_ip4_multicast_leave_group(br, port, ih->group, vid); |
| break; |
| } |
| |
| out: |
| __skb_push(skb2, offset); |
| err_out: |
| if (skb2 != skb) |
| kfree_skb(skb2); |
| 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) |
| { |
| struct sk_buff *skb2; |
| const struct ipv6hdr *ip6h; |
| u8 icmp6_type; |
| u8 nexthdr; |
| __be16 frag_off; |
| unsigned int len; |
| int offset; |
| int err; |
| u16 vid = 0; |
| |
| if (!pskb_may_pull(skb, sizeof(*ip6h))) |
| return -EINVAL; |
| |
| ip6h = ipv6_hdr(skb); |
| |
| /* |
| * We're interested in MLD messages only. |
| * - Version is 6 |
| * - MLD has always Router Alert hop-by-hop option |
| * - But we do not support jumbrograms. |
| */ |
| if (ip6h->version != 6) |
| return 0; |
| |
| /* Prevent flooding this packet if there is no listener present */ |
| if (ipv6_is_transient_multicast(&ip6h->daddr)) |
| BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
| |
| if (ip6h->nexthdr != IPPROTO_HOPOPTS || |
| ip6h->payload_len == 0) |
| return 0; |
| |
| len = ntohs(ip6h->payload_len) + sizeof(*ip6h); |
| if (skb->len < len) |
| return -EINVAL; |
| |
| nexthdr = ip6h->nexthdr; |
| offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr, &frag_off); |
| |
| if (offset < 0 || nexthdr != IPPROTO_ICMPV6) |
| return 0; |
| |
| /* Okay, we found ICMPv6 header */ |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (!skb2) |
| return -ENOMEM; |
| |
| err = -EINVAL; |
| if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr))) |
| goto out; |
| |
| len -= offset - skb_network_offset(skb2); |
| |
| __skb_pull(skb2, offset); |
| skb_reset_transport_header(skb2); |
| skb_postpull_rcsum(skb2, skb_network_header(skb2), |
| skb_network_header_len(skb2)); |
| |
| icmp6_type = icmp6_hdr(skb2)->icmp6_type; |
| |
| switch (icmp6_type) { |
| case ICMPV6_MGM_QUERY: |
| case ICMPV6_MGM_REPORT: |
| case ICMPV6_MGM_REDUCTION: |
| case ICMPV6_MLD2_REPORT: |
| break; |
| default: |
| err = 0; |
| goto out; |
| } |
| |
| /* Okay, we found MLD message. Check further. */ |
| if (skb2->len > len) { |
| err = pskb_trim_rcsum(skb2, len); |
| if (err) |
| goto out; |
| err = -EINVAL; |
| } |
| |
| ip6h = ipv6_hdr(skb2); |
| |
| switch (skb2->ip_summed) { |
| case CHECKSUM_COMPLETE: |
| if (!csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, skb2->len, |
| IPPROTO_ICMPV6, skb2->csum)) |
| break; |
| /*FALLTHROUGH*/ |
| case CHECKSUM_NONE: |
| skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, |
| &ip6h->daddr, |
| skb2->len, |
| IPPROTO_ICMPV6, 0)); |
| if (__skb_checksum_complete(skb2)) |
| goto out; |
| } |
| |
| err = 0; |
| |
| br_vlan_get_tag(skb, &vid); |
| BR_INPUT_SKB_CB(skb)->igmp = 1; |
| |
| switch (icmp6_type) { |
| case ICMPV6_MGM_REPORT: |
| { |
| struct mld_msg *mld; |
| if (!pskb_may_pull(skb2, sizeof(*mld))) { |
| err = -EINVAL; |
| goto out; |
| } |
| mld = (struct mld_msg *)skb_transport_header(skb2); |
| BR_INPUT_SKB_CB(skb)->mrouters_only = 1; |
| err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid); |
| break; |
| } |
| case ICMPV6_MLD2_REPORT: |
| err = br_ip6_multicast_mld2_report(br, port, skb2); |
| break; |
| case ICMPV6_MGM_QUERY: |
| err = br_ip6_multicast_query(br, port, skb2); |
| break; |
| case ICMPV6_MGM_REDUCTION: |
| { |
| struct mld_msg *mld; |
| if (!pskb_may_pull(skb2, sizeof(*mld))) { |
| err = -EINVAL; |
| goto out; |
| } |
| mld = (struct mld_msg *)skb_transport_header(skb2); |
| br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid); |
| } |
| } |
| |
| out: |
| kfree_skb(skb2); |
| return err; |
| } |
| #endif |
| |
| int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, |
| struct sk_buff *skb) |
| { |
| 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): |
| return br_multicast_ipv4_rcv(br, port, skb); |
| #if IS_ENABLED(CONFIG_IPV6) |
| case htons(ETH_P_IPV6): |
| return br_multicast_ipv6_rcv(br, port, skb); |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| static void br_multicast_query_expired(unsigned long data) |
| { |
| struct net_bridge *br = (void *)data; |
| |
| spin_lock(&br->multicast_lock); |
| if (br->multicast_startup_queries_sent < |
| br->multicast_startup_query_count) |
| br->multicast_startup_queries_sent++; |
| |
| br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent); |
| |
| spin_unlock(&br->multicast_lock); |
| } |
| |
| void br_multicast_init(struct net_bridge *br) |
| { |
| br->hash_elasticity = 4; |
| br->hash_max = 512; |
| |
| br->multicast_router = 1; |
| 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->multicast_querier_delay_time = 0; |
| |
| spin_lock_init(&br->multicast_lock); |
| setup_timer(&br->multicast_router_timer, |
| br_multicast_local_router_expired, 0); |
| setup_timer(&br->multicast_querier_timer, |
| br_multicast_querier_expired, (unsigned long)br); |
| setup_timer(&br->multicast_query_timer, br_multicast_query_expired, |
| (unsigned long)br); |
| } |
| |
| void br_multicast_open(struct net_bridge *br) |
| { |
| br->multicast_startup_queries_sent = 0; |
| |
| if (br->multicast_disabled) |
| return; |
| |
| mod_timer(&br->multicast_query_timer, jiffies); |
| } |
| |
| void br_multicast_stop(struct net_bridge *br) |
| { |
| struct net_bridge_mdb_htable *mdb; |
| struct net_bridge_mdb_entry *mp; |
| struct hlist_node *n; |
| u32 ver; |
| int i; |
| |
| del_timer_sync(&br->multicast_router_timer); |
| del_timer_sync(&br->multicast_querier_timer); |
| del_timer_sync(&br->multicast_query_timer); |
| |
| 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); |
| mp->timer_armed = false; |
| 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 = -ENOENT; |
| |
| spin_lock_bh(&br->multicast_lock); |
| if (!netif_running(br->dev)) |
| goto unlock; |
| |
| switch (val) { |
| case 0: |
| case 2: |
| del_timer(&br->multicast_router_timer); |
| /* fall through */ |
| case 1: |
| br->multicast_router = val; |
| err = 0; |
| break; |
| |
| default: |
| err = -EINVAL; |
| break; |
| } |
| |
| unlock: |
| spin_unlock_bh(&br->multicast_lock); |
| |
| return err; |
| } |
| |
| int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val) |
| { |
| struct net_bridge *br = p->br; |
| int err = -ENOENT; |
| |
| spin_lock(&br->multicast_lock); |
| if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED) |
| goto unlock; |
| |
| switch (val) { |
| case 0: |
| case 1: |
| case 2: |
| p->multicast_router = val; |
| err = 0; |
| |
| if (val < 2 && !hlist_unhashed(&p->rlist)) |
| hlist_del_init_rcu(&p->rlist); |
| |
| if (val == 1) |
| break; |
| |
| del_timer(&p->multicast_router_timer); |
| |
| if (val == 0) |
| break; |
| |
| br_multicast_add_router(br, p); |
| break; |
| |
| default: |
| err = -EINVAL; |
| break; |
| } |
| |
| unlock: |
| spin_unlock(&br->multicast_lock); |
| |
| return err; |
| } |
| |
| static void br_multicast_start_querier(struct net_bridge *br) |
| { |
| struct net_bridge_port *port; |
| |
| br_multicast_open(br); |
| |
| list_for_each_entry(port, &br->port_list, list) { |
| if (port->state == BR_STATE_DISABLED || |
| port->state == BR_STATE_BLOCKING) |
| continue; |
| |
| __br_multicast_enable_port(port); |
| } |
| } |
| |
| int br_multicast_toggle(struct net_bridge *br, unsigned long val) |
| { |
| int err = 0; |
| struct net_bridge_mdb_htable *mdb; |
| |
| spin_lock_bh(&br->multicast_lock); |
| if (br->multicast_disabled == !val) |
| goto unlock; |
| |
| 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_start_querier(br); |
| |
| unlock: |
| spin_unlock_bh(&br->multicast_lock); |
| |
| return err; |
| } |
| |
| 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->multicast_querier_timer)) |
| br->multicast_querier_delay_time = jiffies + max_delay; |
| |
| br_multicast_start_querier(br); |
| |
| unlock: |
| spin_unlock_bh(&br->multicast_lock); |
| |
| return 0; |
| } |
| |
| int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) |
| { |
| int err = -ENOENT; |
| u32 old; |
| struct net_bridge_mdb_htable *mdb; |
| |
| spin_lock(&br->multicast_lock); |
| if (!netif_running(br->dev)) |
| goto unlock; |
| |
| err = -EINVAL; |
| 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(&br->multicast_lock); |
| |
| return err; |
| } |