/* * 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 <net/ip.h> #include "br_private.h" static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb, __be32 ip) { return jhash_1word(mdb->secret, (u32)ip) & (mdb->max - 1); } static struct net_bridge_mdb_entry *__br_mdb_ip_get( struct net_bridge_mdb_htable *mdb, __be32 dst, int hash) { struct net_bridge_mdb_entry *mp; struct hlist_node *p; hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { if (dst == mp->addr) return mp; } return NULL; } static struct net_bridge_mdb_entry *br_mdb_ip_get( struct net_bridge_mdb_htable *mdb, __be32 dst) { if (!mdb) return NULL; return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst)); } struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, struct sk_buff *skb) { if (br->multicast_disabled) return NULL; switch (skb->protocol) { case htons(ETH_P_IP): if (BR_INPUT_SKB_CB(skb)->igmp) break; return br_mdb_ip_get(br->mdb, ip_hdr(skb)->daddr); } return NULL; } 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; struct hlist_node *p; int maxlen; int len; int i; for (i = 0; i < old->max; i++) hlist_for_each_entry(mp, p, &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, p, &new->mhash[i], hlist[new->ver]) len++; if (len > maxlen) maxlen = len; } return maxlen > elasticity ? -EINVAL : 0; } static 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; if (!hlist_unhashed(&mp->mglist)) hlist_del_init(&mp->mglist); if (mp->ports) goto out; mdb = br->mdb; hlist_del_rcu(&mp->hlist[mdb->ver]); mdb->size--; del_timer(&mp->query_timer); 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 = br->mdb; struct net_bridge_mdb_entry *mp; struct net_bridge_port_group *p; struct net_bridge_port_group **pp; mp = br_mdb_ip_get(mdb, pg->addr); if (WARN_ON(!mp)) return; for (pp = &mp->ports; (p = *pp); pp = &p->next) { if (p != pg) continue; *pp = p->next; hlist_del_init(&p->mglist); del_timer(&p->timer); del_timer(&p->query_timer); call_rcu_bh(&p->rcu, br_multicast_free_pg); if (!mp->ports && hlist_unhashed(&mp->mglist) && 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)) goto out; br_multicast_del_pg(br, pg); out: spin_unlock(&br->multicast_lock); } static int br_mdb_rehash(struct net_bridge_mdb_htable **mdbp, int max, int elasticity) { struct net_bridge_mdb_htable *old = *mdbp; 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; } call_rcu_bh(&mdb->rcu, br_mdb_free); out: rcu_assign_pointer(*mdbp, mdb); return 0; } static struct sk_buff *br_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 = 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; } static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp) { struct net_bridge *br = mp->br; struct sk_buff *skb; skb = br_multicast_alloc_query(br, mp->addr); if (!skb) goto timer; netif_rx(skb); timer: if (++mp->queries_sent < br->multicast_last_member_count) mod_timer(&mp->query_timer, jiffies + br->multicast_last_member_interval); } static void br_multicast_group_query_expired(unsigned long data) { struct net_bridge_mdb_entry *mp = (void *)data; struct net_bridge *br = mp->br; spin_lock(&br->multicast_lock); if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) || mp->queries_sent >= br->multicast_last_member_count) goto out; br_multicast_send_group_query(mp); out: spin_unlock(&br->multicast_lock); } static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg) { struct net_bridge_port *port = pg->port; struct net_bridge *br = port->br; struct sk_buff *skb; skb = br_multicast_alloc_query(br, pg->addr); if (!skb) goto timer; br_deliver(port, skb); timer: if (++pg->queries_sent < br->multicast_last_member_count) mod_timer(&pg->query_timer, jiffies + br->multicast_last_member_interval); } static void br_multicast_port_group_query_expired(unsigned long data) { struct net_bridge_port_group *pg = (void *)data; struct net_bridge_port *port = pg->port; struct net_bridge *br = port->br; spin_lock(&br->multicast_lock); if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) || pg->queries_sent >= br->multicast_last_member_count) goto out; br_multicast_send_port_group_query(pg); out: spin_unlock(&br->multicast_lock); } static struct net_bridge_mdb_entry *br_multicast_get_group( struct net_bridge *br, struct net_bridge_port *port, __be32 group, int hash) { struct net_bridge_mdb_htable *mdb = br->mdb; struct net_bridge_mdb_entry *mp; struct hlist_node *p; unsigned count = 0; unsigned max; int elasticity; int err; hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) { count++; if (unlikely(group == mp->addr)) { return mp; } } elasticity = 0; max = mdb->max; if (unlikely(count > br->hash_elasticity && count)) { if (net_ratelimit()) printk(KERN_INFO "%s: Multicast hash table " "chain limit reached: %s\n", br->dev->name, port ? port->dev->name : br->dev->name); elasticity = br->hash_elasticity; } if (mdb->size >= max) { max *= 2; if (unlikely(max >= br->hash_max)) { printk(KERN_WARNING "%s: Multicast hash table maximum " "reached, disabling snooping: %s, %d\n", br->dev->name, port ? port->dev->name : br->dev->name, max); err = -E2BIG; disable: br->multicast_disabled = 1; goto err; } } if (max > mdb->max || elasticity) { if (mdb->old) { if (net_ratelimit()) printk(KERN_INFO "%s: Multicast hash table " "on fire: %s\n", br->dev->name, port ? port->dev->name : br->dev->name); err = -EEXIST; goto err; } err = br_mdb_rehash(&br->mdb, max, elasticity); if (err) { printk(KERN_WARNING "%s: Cannot rehash multicast " "hash table, disabling snooping: " "%s, %d, %d\n", br->dev->name, 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; } static struct net_bridge_mdb_entry *br_multicast_new_group( struct net_bridge *br, struct net_bridge_port *port, __be32 group) { struct net_bridge_mdb_htable *mdb = br->mdb; struct net_bridge_mdb_entry *mp; int hash; if (!mdb) { if (br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0)) return NULL; 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 = br->mdb; hash = br_ip_hash(mdb, group); break; default: goto out; } mp = kzalloc(sizeof(*mp), GFP_ATOMIC); if (unlikely(!mp)) goto out; mp->br = br; mp->addr = group; setup_timer(&mp->timer, br_multicast_group_expired, (unsigned long)mp); setup_timer(&mp->query_timer, br_multicast_group_query_expired, (unsigned long)mp); hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]); mdb->size++; out: return mp; } static int br_multicast_add_group(struct net_bridge *br, struct net_bridge_port *port, __be32 group) { struct net_bridge_mdb_entry *mp; struct net_bridge_port_group *p; struct net_bridge_port_group **pp; unsigned long now = jiffies; int err; if (ipv4_is_local_multicast(group)) return 0; 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 (unlikely(IS_ERR(mp) || !mp)) goto err; if (!port) { hlist_add_head(&mp->mglist, &br->mglist); mod_timer(&mp->timer, now + br->multicast_membership_interval); goto out; } for (pp = &mp->ports; (p = *pp); pp = &p->next) { if (p->port == port) goto found; if ((unsigned long)p->port < (unsigned long)port) break; } p = kzalloc(sizeof(*p), GFP_ATOMIC); err = -ENOMEM; if (unlikely(!p)) goto err; p->addr = group; p->port = port; p->next = *pp; hlist_add_head(&p->mglist, &port->mglist); setup_timer(&p->timer, br_multicast_port_group_expired, (unsigned long)p); setup_timer(&p->query_timer, br_multicast_port_group_query_expired, (unsigned long)p); rcu_assign_pointer(*pp, p); found: mod_timer(&p->timer, now + br->multicast_membership_interval); out: err = 0; err: spin_unlock(&br->multicast_lock); return err; } 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_send_query(struct net_bridge *br, struct net_bridge_port *port, u32 sent) { unsigned long time; struct sk_buff *skb; if (!netif_running(br->dev) || br->multicast_disabled || timer_pending(&br->multicast_querier_timer)) return; skb = br_multicast_alloc_query(br, 0); if (!skb) goto timer; if (port) { __skb_push(skb, sizeof(struct ethhdr)); skb->dev = port->dev; NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev, dev_queue_xmit); } else netif_rx(skb); timer: 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 *p, *n; spin_lock(&br->multicast_lock); hlist_for_each_entry_safe(pg, p, 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_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; if (!pskb_may_pull(skb, sizeof(*ih))) return -EINVAL; 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); group = grec->grec_mca; type = grec->grec_type; len += 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_multicast_add_group(br, port, group); if (err) break; } return err; } static void br_multicast_add_router(struct net_bridge *br, struct net_bridge_port *port) { struct hlist_node *p; struct hlist_node **h; for (h = &br->router_list.first; (p = *h) && (unsigned long)container_of(p, struct net_bridge_port, rlist) > (unsigned long)port; h = &p->next) ; port->rlist.pprev = h; port->rlist.next = p; rcu_assign_pointer(*h, &port->rlist); if (p) p->pprev = &port->rlist.next; } 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, __be32 saddr) { if (saddr) mod_timer(&br->multicast_querier_timer, jiffies + br->multicast_querier_interval); else if (timer_pending(&br->multicast_querier_timer)) return; br_multicast_mark_router(br, port); } static int br_multicast_query(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb) { 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 **pp; unsigned long max_delay; unsigned long now = jiffies; __be32 group; int err = 0; spin_lock(&br->multicast_lock); if (!netif_running(br->dev) || (port && port->state == BR_STATE_DISABLED)) goto out; br_multicast_query_received(br, port, iph->saddr); 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; } if (!group) goto out; mp = br_mdb_ip_get(br->mdb, group); if (!mp) goto out; max_delay *= br->multicast_last_member_count; if (!hlist_unhashed(&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 = *pp); 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(&mp->timer, now + max_delay); } out: spin_unlock(&br->multicast_lock); return err; } static void br_multicast_leave_group(struct net_bridge *br, struct net_bridge_port *port, __be32 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; if (ipv4_is_local_multicast(group)) return; 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 = br->mdb; mp = br_mdb_ip_get(mdb, group); if (!mp) goto out; now = jiffies; time = now + br->multicast_last_member_count * br->multicast_last_member_interval; if (!port) { if (!hlist_unhashed(&mp->mglist) && (timer_pending(&mp->timer) ? time_after(mp->timer.expires, time) : try_to_del_timer_sync(&mp->timer) >= 0)) { mod_timer(&mp->timer, time); mp->queries_sent = 0; mod_timer(&mp->query_timer, now); } goto out; } for (p = mp->ports; p; p = p->next) { 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); p->queries_sent = 0; mod_timer(&p->query_timer, now); } break; } out: spin_unlock(&br->multicast_lock); } static int br_multicast_ipv4_rcv(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb) { struct sk_buff *skb2 = skb; struct iphdr *iph; struct igmphdr *ih; unsigned len; unsigned offset; int err; BR_INPUT_SKB_CB(skb)->igmp = 0; BR_INPUT_SKB_CB(skb)->mrouters_only = 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) 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; iph = ip_hdr(skb2); 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_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(skb2)->mrouters_only = 1; err = br_multicast_add_group(br, port, ih->group); break; case IGMPV3_HOST_MEMBERSHIP_REPORT: err = br_multicast_igmp3_report(br, port, skb2); break; case IGMP_HOST_MEMBERSHIP_QUERY: err = br_multicast_query(br, port, skb2); break; case IGMP_HOST_LEAVE_MESSAGE: br_multicast_leave_group(br, port, ih->group); break; } out: __skb_push(skb2, offset); err_out: if (skb2 != skb) kfree_skb(skb2); return err; } int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, struct sk_buff *skb) { if (br->multicast_disabled) return 0; switch (skb->protocol) { case htons(ETH_P_IP): return br_multicast_ipv4_rcv(br, port, skb); } 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_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; 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_local_router_expired, 0); 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 *p, *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 = br->mdb; if (!mdb) goto out; br->mdb = NULL; ver = mdb->ver; for (i = 0; i < mdb->max; i++) { hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i], hlist[ver]) { del_timer(&mp->timer); del_timer(&mp->query_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 = -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; } int br_multicast_toggle(struct net_bridge *br, unsigned long val) { struct net_bridge_port *port; int err = -ENOENT; spin_lock(&br->multicast_lock); if (!netif_running(br->dev)) goto unlock; err = 0; if (br->multicast_disabled == !val) goto unlock; br->multicast_disabled = !val; if (br->multicast_disabled) goto unlock; if (br->mdb) { if (br->mdb->old) { err = -EEXIST; rollback: br->multicast_disabled = !!val; goto unlock; } err = br_mdb_rehash(&br->mdb, br->mdb->max, br->hash_elasticity); if (err) goto rollback; } 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); } unlock: spin_unlock(&br->multicast_lock); return err; } int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val) { int err = -ENOENT; u32 old; spin_lock(&br->multicast_lock); if (!netif_running(br->dev)) goto unlock; err = -EINVAL; if (!is_power_of_2(val)) goto unlock; if (br->mdb && val < br->mdb->size) goto unlock; err = 0; old = br->hash_max; br->hash_max = val; if (br->mdb) { if (br->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; }