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br_multicast.c
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br_multicast.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Bridge multicast support.
*
* Copyright (c) 2010 Herbert Xu <[email protected]>
*/
#include <linux/err.h>
#include <linux/export.h>
#include <linux/if_ether.h>
#include <linux/igmp.h>
#include <linux/in.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 <linux/icmpv6.h>
#include <net/ipv6.h>
#include <net/mld.h>
#include <net/ip6_checksum.h>
#include <net/addrconf.h>
#endif
#include "br_private.h"
static const struct rhashtable_params br_mdb_rht_params = {
.head_offset = offsetof(struct net_bridge_mdb_entry, rhnode),
.key_offset = offsetof(struct net_bridge_mdb_entry, addr),
.key_len = sizeof(struct br_ip),
.automatic_shrinking = true,
};
static const struct rhashtable_params br_sg_port_rht_params = {
.head_offset = offsetof(struct net_bridge_port_group, rhnode),
.key_offset = offsetof(struct net_bridge_port_group, key),
.key_len = sizeof(struct net_bridge_port_group_sg_key),
.automatic_shrinking = true,
};
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 br_multicast_port_group_rexmit(struct timer_list *t);
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
static struct net_bridge_port_group *
__br_multicast_add_group(struct net_bridge *br,
struct net_bridge_port *port,
struct br_ip *group,
const unsigned char *src,
u8 filter_mode,
bool igmpv2_mldv1,
bool blocked);
static void br_multicast_find_del_pg(struct net_bridge *br,
struct net_bridge_port_group *pg);
static struct net_bridge_port_group *
br_sg_port_find(struct net_bridge *br,
struct net_bridge_port_group_sg_key *sg_p)
{
lockdep_assert_held_once(&br->multicast_lock);
return rhashtable_lookup_fast(&br->sg_port_tbl, sg_p,
br_sg_port_rht_params);
}
static struct net_bridge_mdb_entry *br_mdb_ip_get_rcu(struct net_bridge *br,
struct br_ip *dst)
{
return rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
}
struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge *br,
struct br_ip *dst)
{
struct net_bridge_mdb_entry *ent;
lockdep_assert_held_once(&br->multicast_lock);
rcu_read_lock();
ent = rhashtable_lookup(&br->mdb_hash_tbl, dst, br_mdb_rht_params);
rcu_read_unlock();
return ent;
}
static struct net_bridge_mdb_entry *br_mdb_ip4_get(struct net_bridge *br,
__be32 dst, __u16 vid)
{
struct br_ip br_dst;
memset(&br_dst, 0, sizeof(br_dst));
br_dst.dst.ip4 = dst;
br_dst.proto = htons(ETH_P_IP);
br_dst.vid = vid;
return br_mdb_ip_get(br, &br_dst);
}
#if IS_ENABLED(CONFIG_IPV6)
static struct net_bridge_mdb_entry *br_mdb_ip6_get(struct net_bridge *br,
const struct in6_addr *dst,
__u16 vid)
{
struct br_ip br_dst;
memset(&br_dst, 0, sizeof(br_dst));
br_dst.dst.ip6 = *dst;
br_dst.proto = htons(ETH_P_IPV6);
br_dst.vid = vid;
return br_mdb_ip_get(br, &br_dst);
}
#endif
struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
struct sk_buff *skb, u16 vid)
{
struct br_ip ip;
if (!br_opt_get(br, BROPT_MULTICAST_ENABLED))
return NULL;
if (BR_INPUT_SKB_CB(skb)->igmp)
return NULL;
memset(&ip, 0, sizeof(ip));
ip.proto = skb->protocol;
ip.vid = vid;
switch (skb->protocol) {
case htons(ETH_P_IP):
ip.dst.ip4 = ip_hdr(skb)->daddr;
if (br->multicast_igmp_version == 3) {
struct net_bridge_mdb_entry *mdb;
ip.src.ip4 = ip_hdr(skb)->saddr;
mdb = br_mdb_ip_get_rcu(br, &ip);
if (mdb)
return mdb;
ip.src.ip4 = 0;
}
break;
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
ip.dst.ip6 = ipv6_hdr(skb)->daddr;
if (br->multicast_mld_version == 2) {
struct net_bridge_mdb_entry *mdb;
ip.src.ip6 = ipv6_hdr(skb)->saddr;
mdb = br_mdb_ip_get_rcu(br, &ip);
if (mdb)
return mdb;
memset(&ip.src.ip6, 0, sizeof(ip.src.ip6));
}
break;
#endif
default:
ip.proto = 0;
ether_addr_copy(ip.dst.mac_addr, eth_hdr(skb)->h_dest);
}
return br_mdb_ip_get_rcu(br, &ip);
}
static bool br_port_group_equal(struct net_bridge_port_group *p,
struct net_bridge_port *port,
const unsigned char *src)
{
if (p->key.port != port)
return false;
if (!(port->flags & BR_MULTICAST_TO_UNICAST))
return true;
return ether_addr_equal(src, p->eth_addr);
}
static void __fwd_add_star_excl(struct net_bridge_port_group *pg,
struct br_ip *sg_ip)
{
struct net_bridge_port_group_sg_key sg_key;
struct net_bridge *br = pg->key.port->br;
struct net_bridge_port_group *src_pg;
memset(&sg_key, 0, sizeof(sg_key));
sg_key.port = pg->key.port;
sg_key.addr = *sg_ip;
if (br_sg_port_find(br, &sg_key))
return;
src_pg = __br_multicast_add_group(br, pg->key.port, sg_ip, pg->eth_addr,
MCAST_INCLUDE, false, false);
if (IS_ERR_OR_NULL(src_pg) ||
src_pg->rt_protocol != RTPROT_KERNEL)
return;
src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
}
static void __fwd_del_star_excl(struct net_bridge_port_group *pg,
struct br_ip *sg_ip)
{
struct net_bridge_port_group_sg_key sg_key;
struct net_bridge *br = pg->key.port->br;
struct net_bridge_port_group *src_pg;
memset(&sg_key, 0, sizeof(sg_key));
sg_key.port = pg->key.port;
sg_key.addr = *sg_ip;
src_pg = br_sg_port_find(br, &sg_key);
if (!src_pg || !(src_pg->flags & MDB_PG_FLAGS_STAR_EXCL) ||
src_pg->rt_protocol != RTPROT_KERNEL)
return;
br_multicast_find_del_pg(br, src_pg);
}
/* When a port group transitions to (or is added as) EXCLUDE we need to add it
* to all other ports' S,G entries which are not blocked by the current group
* for proper replication, the assumption is that any S,G blocked entries
* are already added so the S,G,port lookup should skip them.
* When a port group transitions from EXCLUDE -> INCLUDE mode or is being
* deleted we need to remove it from all ports' S,G entries where it was
* automatically installed before (i.e. where it's MDB_PG_FLAGS_STAR_EXCL).
*/
void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
u8 filter_mode)
{
struct net_bridge *br = pg->key.port->br;
struct net_bridge_port_group *pg_lst;
struct net_bridge_mdb_entry *mp;
struct br_ip sg_ip;
if (WARN_ON(!br_multicast_is_star_g(&pg->key.addr)))
return;
mp = br_mdb_ip_get(br, &pg->key.addr);
if (!mp)
return;
memset(&sg_ip, 0, sizeof(sg_ip));
sg_ip = pg->key.addr;
for (pg_lst = mlock_dereference(mp->ports, br);
pg_lst;
pg_lst = mlock_dereference(pg_lst->next, br)) {
struct net_bridge_group_src *src_ent;
if (pg_lst == pg)
continue;
hlist_for_each_entry(src_ent, &pg_lst->src_list, node) {
if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
continue;
sg_ip.src = src_ent->addr.src;
switch (filter_mode) {
case MCAST_INCLUDE:
__fwd_del_star_excl(pg, &sg_ip);
break;
case MCAST_EXCLUDE:
__fwd_add_star_excl(pg, &sg_ip);
break;
}
}
}
}
/* called when adding a new S,G with host_joined == false by default */
static void br_multicast_sg_host_state(struct net_bridge_mdb_entry *star_mp,
struct net_bridge_port_group *sg)
{
struct net_bridge_mdb_entry *sg_mp;
if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
return;
if (!star_mp->host_joined)
return;
sg_mp = br_mdb_ip_get(star_mp->br, &sg->key.addr);
if (!sg_mp)
return;
sg_mp->host_joined = true;
}
/* set the host_joined state of all of *,G's S,G entries */
static void br_multicast_star_g_host_state(struct net_bridge_mdb_entry *star_mp)
{
struct net_bridge *br = star_mp->br;
struct net_bridge_mdb_entry *sg_mp;
struct net_bridge_port_group *pg;
struct br_ip sg_ip;
if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
return;
memset(&sg_ip, 0, sizeof(sg_ip));
sg_ip = star_mp->addr;
for (pg = mlock_dereference(star_mp->ports, br);
pg;
pg = mlock_dereference(pg->next, br)) {
struct net_bridge_group_src *src_ent;
hlist_for_each_entry(src_ent, &pg->src_list, node) {
if (!(src_ent->flags & BR_SGRP_F_INSTALLED))
continue;
sg_ip.src = src_ent->addr.src;
sg_mp = br_mdb_ip_get(br, &sg_ip);
if (!sg_mp)
continue;
sg_mp->host_joined = star_mp->host_joined;
}
}
}
static void br_multicast_sg_del_exclude_ports(struct net_bridge_mdb_entry *sgmp)
{
struct net_bridge_port_group __rcu **pp;
struct net_bridge_port_group *p;
/* *,G exclude ports are only added to S,G entries */
if (WARN_ON(br_multicast_is_star_g(&sgmp->addr)))
return;
/* we need the STAR_EXCLUDE ports if there are non-STAR_EXCLUDE ports
* we should ignore perm entries since they're managed by user-space
*/
for (pp = &sgmp->ports;
(p = mlock_dereference(*pp, sgmp->br)) != NULL;
pp = &p->next)
if (!(p->flags & (MDB_PG_FLAGS_STAR_EXCL |
MDB_PG_FLAGS_PERMANENT)))
return;
/* currently the host can only have joined the *,G which means
* we treat it as EXCLUDE {}, so for an S,G it's considered a
* STAR_EXCLUDE entry and we can safely leave it
*/
sgmp->host_joined = false;
for (pp = &sgmp->ports;
(p = mlock_dereference(*pp, sgmp->br)) != NULL;) {
if (!(p->flags & MDB_PG_FLAGS_PERMANENT))
br_multicast_del_pg(sgmp, p, pp);
else
pp = &p->next;
}
}
void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
struct net_bridge_port_group *sg)
{
struct net_bridge_port_group_sg_key sg_key;
struct net_bridge *br = star_mp->br;
struct net_bridge_port_group *pg;
if (WARN_ON(br_multicast_is_star_g(&sg->key.addr)))
return;
if (WARN_ON(!br_multicast_is_star_g(&star_mp->addr)))
return;
br_multicast_sg_host_state(star_mp, sg);
memset(&sg_key, 0, sizeof(sg_key));
sg_key.addr = sg->key.addr;
/* we need to add all exclude ports to the S,G */
for (pg = mlock_dereference(star_mp->ports, br);
pg;
pg = mlock_dereference(pg->next, br)) {
struct net_bridge_port_group *src_pg;
if (pg == sg || pg->filter_mode == MCAST_INCLUDE)
continue;
sg_key.port = pg->key.port;
if (br_sg_port_find(br, &sg_key))
continue;
src_pg = __br_multicast_add_group(br, pg->key.port,
&sg->key.addr,
sg->eth_addr,
MCAST_INCLUDE, false, false);
if (IS_ERR_OR_NULL(src_pg) ||
src_pg->rt_protocol != RTPROT_KERNEL)
continue;
src_pg->flags |= MDB_PG_FLAGS_STAR_EXCL;
}
}
static void br_multicast_fwd_src_add(struct net_bridge_group_src *src)
{
struct net_bridge_mdb_entry *star_mp;
struct net_bridge_port_group *sg;
struct br_ip sg_ip;
if (src->flags & BR_SGRP_F_INSTALLED)
return;
memset(&sg_ip, 0, sizeof(sg_ip));
sg_ip = src->pg->key.addr;
sg_ip.src = src->addr.src;
sg = __br_multicast_add_group(src->br, src->pg->key.port, &sg_ip,
src->pg->eth_addr, MCAST_INCLUDE, false,
!timer_pending(&src->timer));
if (IS_ERR_OR_NULL(sg))
return;
src->flags |= BR_SGRP_F_INSTALLED;
sg->flags &= ~MDB_PG_FLAGS_STAR_EXCL;
/* if it was added by user-space as perm we can skip next steps */
if (sg->rt_protocol != RTPROT_KERNEL &&
(sg->flags & MDB_PG_FLAGS_PERMANENT))
return;
/* the kernel is now responsible for removing this S,G */
del_timer(&sg->timer);
star_mp = br_mdb_ip_get(src->br, &src->pg->key.addr);
if (!star_mp)
return;
br_multicast_sg_add_exclude_ports(star_mp, sg);
}
static void br_multicast_fwd_src_remove(struct net_bridge_group_src *src)
{
struct net_bridge_port_group *p, *pg = src->pg;
struct net_bridge_port_group __rcu **pp;
struct net_bridge_mdb_entry *mp;
struct br_ip sg_ip;
memset(&sg_ip, 0, sizeof(sg_ip));
sg_ip = pg->key.addr;
sg_ip.src = src->addr.src;
mp = br_mdb_ip_get(src->br, &sg_ip);
if (!mp)
return;
for (pp = &mp->ports;
(p = mlock_dereference(*pp, src->br)) != NULL;
pp = &p->next) {
if (!br_port_group_equal(p, pg->key.port, pg->eth_addr))
continue;
if (p->rt_protocol != RTPROT_KERNEL &&
(p->flags & MDB_PG_FLAGS_PERMANENT))
break;
br_multicast_del_pg(mp, p, pp);
break;
}
src->flags &= ~BR_SGRP_F_INSTALLED;
}
/* install S,G and based on src's timer enable or disable forwarding */
static void br_multicast_fwd_src_handle(struct net_bridge_group_src *src)
{
struct net_bridge_port_group_sg_key sg_key;
struct net_bridge_port_group *sg;
u8 old_flags;
br_multicast_fwd_src_add(src);
memset(&sg_key, 0, sizeof(sg_key));
sg_key.addr = src->pg->key.addr;
sg_key.addr.src = src->addr.src;
sg_key.port = src->pg->key.port;
sg = br_sg_port_find(src->br, &sg_key);
if (!sg || (sg->flags & MDB_PG_FLAGS_PERMANENT))
return;
old_flags = sg->flags;
if (timer_pending(&src->timer))
sg->flags &= ~MDB_PG_FLAGS_BLOCKED;
else
sg->flags |= MDB_PG_FLAGS_BLOCKED;
if (old_flags != sg->flags) {
struct net_bridge_mdb_entry *sg_mp;
sg_mp = br_mdb_ip_get(src->br, &sg_key.addr);
if (!sg_mp)
return;
br_mdb_notify(src->br->dev, sg_mp, sg, RTM_NEWMDB);
}
}
static void br_multicast_destroy_mdb_entry(struct net_bridge_mcast_gc *gc)
{
struct net_bridge_mdb_entry *mp;
mp = container_of(gc, struct net_bridge_mdb_entry, mcast_gc);
WARN_ON(!hlist_unhashed(&mp->mdb_node));
WARN_ON(mp->ports);
del_timer_sync(&mp->timer);
kfree_rcu(mp, rcu);
}
static void br_multicast_del_mdb_entry(struct net_bridge_mdb_entry *mp)
{
struct net_bridge *br = mp->br;
rhashtable_remove_fast(&br->mdb_hash_tbl, &mp->rhnode,
br_mdb_rht_params);
hlist_del_init_rcu(&mp->mdb_node);
hlist_add_head(&mp->mcast_gc.gc_node, &br->mcast_gc_list);
queue_work(system_long_wq, &br->mcast_gc_work);
}
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;
spin_lock(&br->multicast_lock);
if (hlist_unhashed(&mp->mdb_node) || !netif_running(br->dev) ||
timer_pending(&mp->timer))
goto out;
br_multicast_host_leave(mp, true);
if (mp->ports)
goto out;
br_multicast_del_mdb_entry(mp);
out:
spin_unlock(&br->multicast_lock);
}
static void br_multicast_destroy_group_src(struct net_bridge_mcast_gc *gc)
{
struct net_bridge_group_src *src;
src = container_of(gc, struct net_bridge_group_src, mcast_gc);
WARN_ON(!hlist_unhashed(&src->node));
del_timer_sync(&src->timer);
kfree_rcu(src, rcu);
}
static void br_multicast_del_group_src(struct net_bridge_group_src *src)
{
struct net_bridge *br = src->pg->key.port->br;
br_multicast_fwd_src_remove(src);
hlist_del_init_rcu(&src->node);
src->pg->src_ents--;
hlist_add_head(&src->mcast_gc.gc_node, &br->mcast_gc_list);
queue_work(system_long_wq, &br->mcast_gc_work);
}
static void br_multicast_destroy_port_group(struct net_bridge_mcast_gc *gc)
{
struct net_bridge_port_group *pg;
pg = container_of(gc, struct net_bridge_port_group, mcast_gc);
WARN_ON(!hlist_unhashed(&pg->mglist));
WARN_ON(!hlist_empty(&pg->src_list));
del_timer_sync(&pg->rexmit_timer);
del_timer_sync(&pg->timer);
kfree_rcu(pg, rcu);
}
void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
struct net_bridge_port_group *pg,
struct net_bridge_port_group __rcu **pp)
{
struct net_bridge *br = pg->key.port->br;
struct net_bridge_group_src *ent;
struct hlist_node *tmp;
rcu_assign_pointer(*pp, pg->next);
hlist_del_init(&pg->mglist);
hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
br_multicast_del_group_src(ent);
br_mdb_notify(br->dev, mp, pg, RTM_DELMDB);
if (!br_multicast_is_star_g(&mp->addr)) {
rhashtable_remove_fast(&br->sg_port_tbl, &pg->rhnode,
br_sg_port_rht_params);
br_multicast_sg_del_exclude_ports(mp);
} else {
br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
}
hlist_add_head(&pg->mcast_gc.gc_node, &br->mcast_gc_list);
queue_work(system_long_wq, &br->mcast_gc_work);
if (!mp->ports && !mp->host_joined && netif_running(br->dev))
mod_timer(&mp->timer, jiffies);
}
static void br_multicast_find_del_pg(struct net_bridge *br,
struct net_bridge_port_group *pg)
{
struct net_bridge_port_group __rcu **pp;
struct net_bridge_mdb_entry *mp;
struct net_bridge_port_group *p;
mp = br_mdb_ip_get(br, &pg->key.addr);
if (WARN_ON(!mp))
return;
for (pp = &mp->ports;
(p = mlock_dereference(*pp, br)) != NULL;
pp = &p->next) {
if (p != pg)
continue;
br_multicast_del_pg(mp, pg, pp);
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_group_src *src_ent;
struct net_bridge *br = pg->key.port->br;
struct hlist_node *tmp;
bool changed;
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;
changed = !!(pg->filter_mode == MCAST_EXCLUDE);
pg->filter_mode = MCAST_INCLUDE;
hlist_for_each_entry_safe(src_ent, tmp, &pg->src_list, node) {
if (!timer_pending(&src_ent->timer)) {
br_multicast_del_group_src(src_ent);
changed = true;
}
}
if (hlist_empty(&pg->src_list)) {
br_multicast_find_del_pg(br, pg);
} else if (changed) {
struct net_bridge_mdb_entry *mp = br_mdb_ip_get(br, &pg->key.addr);
if (changed && br_multicast_is_star_g(&pg->key.addr))
br_multicast_star_g_handle_mode(pg, MCAST_INCLUDE);
if (WARN_ON(!mp))
goto out;
br_mdb_notify(br->dev, mp, pg, RTM_NEWMDB);
}
out:
spin_unlock(&br->multicast_lock);
}
static void br_multicast_gc(struct hlist_head *head)
{
struct net_bridge_mcast_gc *gcent;
struct hlist_node *tmp;
hlist_for_each_entry_safe(gcent, tmp, head, gc_node) {
hlist_del_init(&gcent->gc_node);
gcent->destroy(gcent);
}
}
static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
struct net_bridge_port_group *pg,
__be32 ip_dst, __be32 group,
bool with_srcs, bool over_lmqt,
u8 sflag, u8 *igmp_type,
bool *need_rexmit)
{
struct net_bridge_port *p = pg ? pg->key.port : NULL;
struct net_bridge_group_src *ent;
size_t pkt_size, igmp_hdr_size;
unsigned long now = jiffies;
struct igmpv3_query *ihv3;
void *csum_start = NULL;
__sum16 *csum = NULL;
struct sk_buff *skb;
struct igmphdr *ih;
struct ethhdr *eth;
unsigned long lmqt;
struct iphdr *iph;
u16 lmqt_srcs = 0;
igmp_hdr_size = sizeof(*ih);
if (br->multicast_igmp_version == 3) {
igmp_hdr_size = sizeof(*ihv3);
if (pg && with_srcs) {
lmqt = now + (br->multicast_last_member_interval *
br->multicast_last_member_count);
hlist_for_each_entry(ent, &pg->src_list, node) {
if (over_lmqt == time_after(ent->timer.expires,
lmqt) &&
ent->src_query_rexmit_cnt > 0)
lmqt_srcs++;
}
if (!lmqt_srcs)
return NULL;
igmp_hdr_size += lmqt_srcs * sizeof(__be32);
}
}
pkt_size = sizeof(*eth) + sizeof(*iph) + 4 + igmp_hdr_size;
if ((p && pkt_size > p->dev->mtu) ||
pkt_size > br->dev->mtu)
return NULL;
skb = netdev_alloc_skb_ip_align(br->dev, pkt_size);
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);
ip_eth_mc_map(ip_dst, eth->h_dest);
eth->h_proto = htons(ETH_P_IP);
skb_put(skb, sizeof(*eth));
skb_set_network_header(skb, skb->len);
iph = ip_hdr(skb);
iph->tot_len = htons(pkt_size - sizeof(*eth));
iph->version = 4;
iph->ihl = 6;
iph->tos = 0xc0;
iph->id = 0;
iph->frag_off = htons(IP_DF);
iph->ttl = 1;
iph->protocol = IPPROTO_IGMP;
iph->saddr = br_opt_get(br, BROPT_MULTICAST_QUERY_USE_IFADDR) ?
inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
iph->daddr = ip_dst;
((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;
csum = &ih->csum;
csum_start = (void *)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 = htons(lmqt_srcs);
ihv3->resv = 0;
ihv3->suppress = sflag;
ihv3->qrv = 2;
ihv3->csum = 0;
csum = &ihv3->csum;
csum_start = (void *)ihv3;
if (!pg || !with_srcs)
break;
lmqt_srcs = 0;
hlist_for_each_entry(ent, &pg->src_list, node) {
if (over_lmqt == time_after(ent->timer.expires,
lmqt) &&
ent->src_query_rexmit_cnt > 0) {
ihv3->srcs[lmqt_srcs++] = ent->addr.src.ip4;
ent->src_query_rexmit_cnt--;
if (need_rexmit && ent->src_query_rexmit_cnt)
*need_rexmit = true;
}
}
if (WARN_ON(lmqt_srcs != ntohs(ihv3->nsrcs))) {
kfree_skb(skb);
return NULL;
}
break;
}
if (WARN_ON(!csum || !csum_start)) {
kfree_skb(skb);
return NULL;
}
*csum = ip_compute_csum(csum_start, igmp_hdr_size);
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,
struct net_bridge_port_group *pg,
const struct in6_addr *ip6_dst,
const struct in6_addr *group,
bool with_srcs, bool over_llqt,
u8 sflag, u8 *igmp_type,
bool *need_rexmit)
{
struct net_bridge_port *p = pg ? pg->key.port : NULL;
struct net_bridge_group_src *ent;
size_t pkt_size, mld_hdr_size;
unsigned long now = jiffies;
struct mld2_query *mld2q;
void *csum_start = NULL;
unsigned long interval;
__sum16 *csum = NULL;
struct ipv6hdr *ip6h;
struct mld_msg *mldq;
struct sk_buff *skb;
unsigned long llqt;
struct ethhdr *eth;
u16 llqt_srcs = 0;
u8 *hopopt;
mld_hdr_size = sizeof(*mldq);
if (br->multicast_mld_version == 2) {
mld_hdr_size = sizeof(*mld2q);
if (pg && with_srcs) {
llqt = now + (br->multicast_last_member_interval *
br->multicast_last_member_count);
hlist_for_each_entry(ent, &pg->src_list, node) {
if (over_llqt == time_after(ent->timer.expires,
llqt) &&
ent->src_query_rexmit_cnt > 0)
llqt_srcs++;
}
if (!llqt_srcs)
return NULL;
mld_hdr_size += llqt_srcs * sizeof(struct in6_addr);
}
}
pkt_size = sizeof(*eth) + sizeof(*ip6h) + 8 + mld_hdr_size;
if ((p && pkt_size > p->dev->mtu) ||
pkt_size > br->dev->mtu)
return NULL;
skb = netdev_alloc_skb_ip_align(br->dev, pkt_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;
ip6h->daddr = *ip6_dst;
if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
&ip6h->saddr)) {
kfree_skb(skb);
br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, false);
return NULL;
}
br_opt_toggle(br, BROPT_HAS_IPV6_ADDR, true);
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(group) ?
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 = *group;
csum = &mldq->mld_cksum;
csum_start = (void *)mldq;
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 = sflag;
mld2q->mld2q_qrv = 2;
mld2q->mld2q_nsrcs = htons(llqt_srcs);
mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
mld2q->mld2q_mca = *group;
csum = &mld2q->mld2q_cksum;
csum_start = (void *)mld2q;
if (!pg || !with_srcs)
break;
llqt_srcs = 0;
hlist_for_each_entry(ent, &pg->src_list, node) {
if (over_llqt == time_after(ent->timer.expires,
llqt) &&
ent->src_query_rexmit_cnt > 0) {
mld2q->mld2q_srcs[llqt_srcs++] = ent->addr.src.ip6;
ent->src_query_rexmit_cnt--;
if (need_rexmit && ent->src_query_rexmit_cnt)
*need_rexmit = true;
}
}
if (WARN_ON(llqt_srcs != ntohs(mld2q->mld2q_nsrcs))) {
kfree_skb(skb);
return NULL;
}
break;
}
if (WARN_ON(!csum || !csum_start)) {
kfree_skb(skb);
return NULL;
}
*csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, mld_hdr_size,
IPPROTO_ICMPV6,
csum_partial(csum_start, mld_hdr_size, 0));
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 net_bridge_port_group *pg,
struct br_ip *ip_dst,
struct br_ip *group,
bool with_srcs, bool over_lmqt,
u8 sflag, u8 *igmp_type,
bool *need_rexmit)