Initial functions for group source lists which are needed for IGMPv3
include/exclude lists. Currently only IPv4 sources are supported.
User-added mdb entries are created with exclude filter mode, we can
extend that later to allow user-supplied mode. When group src entries
are deleted, they're freed from a workqueue to make sure their timers
are not still running. Source entries are protected by the multicast_lock
and rcu. The number of src groups per port group is limited to 32.
v2: allow src groups to be traversed under rcu
Signed-off-by: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>
---
net/bridge/br_mdb.c | 6 ++
net/bridge/br_multicast.c | 129 ++++++++++++++++++++++++++++++++++++++
net/bridge/br_private.h | 23 +++++++
3 files changed, 158 insertions(+)
diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index da5ed4cf9233..025a5aff2b2f 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -641,6 +641,7 @@ static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
p = br_multicast_new_port_group(port, group, *pp, state, NULL);
if (unlikely(!p))
return -ENOMEM;
+ p->filter_mode = MCAST_EXCLUDE;
rcu_assign_pointer(*pp, p);
if (state == MDB_TEMPORARY)
mod_timer(&p->timer, now + br->multicast_membership_interval);
@@ -761,6 +762,11 @@ static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
if (!p->port || p->port->dev->ifindex != entry->ifindex)
continue;
+ if (!hlist_empty(&p->src_list)) {
+ err = -EINVAL;
+ goto unlock;
+ }
+
if (p->port->state == BR_STATE_DISABLED)
goto unlock;
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 4c4a93abde68..9269d62884e5 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -163,12 +163,24 @@ static void br_multicast_group_expired(struct timer_list *t)
spin_unlock(&br->multicast_lock);
}
+static void br_multicast_del_group_src(struct net_bridge_group_src *src)
+{
+ struct net_bridge *br = src->pg->port->br;
+
+ hlist_del_init_rcu(&src->node);
+ src->pg->src_ents--;
+ hlist_add_head(&src->del_node, &br->src_gc_list);
+ queue_work(system_long_wq, &br->src_gc_work);
+}
+
static void br_multicast_del_pg(struct net_bridge *br,
struct net_bridge_port_group *pg)
{
struct net_bridge_mdb_entry *mp;
struct net_bridge_port_group *p;
struct net_bridge_port_group __rcu **pp;
+ struct net_bridge_group_src *ent;
+ struct hlist_node *tmp;
mp = br_mdb_ip_get(br, &pg->addr);
if (WARN_ON(!mp))
@@ -183,6 +195,8 @@ static void br_multicast_del_pg(struct net_bridge *br,
rcu_assign_pointer(*pp, p->next);
hlist_del_init(&p->mglist);
del_timer(&p->timer);
+ hlist_for_each_entry_safe(ent, tmp, &pg->src_list, node)
+ br_multicast_del_group_src(ent);
br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
p->flags);
kfree_rcu(p, rcu);
@@ -470,6 +484,83 @@ struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
return mp;
}
+static void br_multicast_group_src_expired(struct timer_list *t)
+{
+ struct net_bridge_group_src *src = from_timer(src, t, timer);
+ struct net_bridge_port_group *pg;
+ struct net_bridge *br = src->br;
+
+ spin_lock(&br->multicast_lock);
+ if (hlist_unhashed(&src->node) || !netif_running(br->dev) ||
+ timer_pending(&src->timer))
+ goto out;
+
+ pg = src->pg;
+ br_debug(br, "port %s: src %pI4 group %pI4 filter mode %u timer expired\n",
+ pg->port->dev->name, &src->addr.u.ip4, &src->pg->addr.u.ip4,
+ src->pg->filter_mode);
+
+ if (pg->filter_mode == MCAST_INCLUDE) {
+ br_multicast_del_group_src(src);
+ if (!hlist_empty(&pg->src_list))
+ goto out;
+ br_multicast_del_pg(br, pg);
+ }
+out:
+ spin_unlock(&br->multicast_lock);
+}
+
+static struct net_bridge_group_src *
+br_multicast_find_group_src(struct net_bridge_port_group *pg, struct br_ip *ip)
+{
+ struct net_bridge_group_src *ent;
+
+ hlist_for_each_entry(ent, &pg->src_list, node) {
+ if (ent->addr.proto != ip->proto)
+ continue;
+
+ switch (ip->proto) {
+ case htons(ETH_P_IP):
+ if (ip->u.ip4 == ent->addr.u.ip4)
+ return ent;
+ break;
+ }
+ }
+
+ return NULL;
+}
+
+static struct net_bridge_group_src *
+br_multicast_new_group_src(struct net_bridge_port_group *pg, struct br_ip *src_ip)
+{
+ struct net_bridge_group_src *grp_src;
+
+ if (unlikely(pg->src_ents >= PG_SRC_ENT_LIMIT))
+ return NULL;
+
+ switch (src_ip->proto) {
+ case htons(ETH_P_IP):
+ if (ipv4_is_zeronet(src_ip->u.ip4) ||
+ ipv4_is_multicast(src_ip->u.ip4))
+ return NULL;
+ break;
+ }
+
+ grp_src = kzalloc(sizeof(*grp_src), GFP_ATOMIC);
+ if (unlikely(!grp_src))
+ return NULL;
+
+ grp_src->pg = pg;
+ grp_src->br = pg->port->br;
+ grp_src->addr = *src_ip;
+ timer_setup(&grp_src->timer, br_multicast_group_src_expired, 0);
+
+ hlist_add_head_rcu(&grp_src->node, &pg->src_list);
+ pg->src_ents++;
+
+ return grp_src;
+}
+
struct net_bridge_port_group *br_multicast_new_port_group(
struct net_bridge_port *port,
struct br_ip *group,
@@ -486,6 +577,12 @@ struct net_bridge_port_group *br_multicast_new_port_group(
p->addr = *group;
p->port = port;
p->flags = flags;
+ if (group->proto == htons(ETH_P_IP) &&
+ port->br->multicast_igmp_version == 3)
+ p->filter_mode = MCAST_INCLUDE;
+ else
+ p->filter_mode = MCAST_EXCLUDE;
+ INIT_HLIST_HEAD(&p->src_list);
rcu_assign_pointer(p->next, next);
hlist_add_head(&p->mglist, &port->mglist);
timer_setup(&p->timer, br_multicast_port_group_expired, 0);
@@ -1781,6 +1878,31 @@ static void br_ip6_multicast_query_expired(struct timer_list *t)
}
#endif
+static void __grp_src_gc(struct hlist_head *head)
+{
+ struct net_bridge_group_src *ent;
+ struct hlist_node *tmp;
+
+ hlist_for_each_entry_safe(ent, tmp, head, del_node) {
+ hlist_del_init(&ent->del_node);
+ del_timer_sync(&ent->timer);
+ kfree_rcu(ent, rcu);
+ }
+}
+
+static void br_multicast_src_gc(struct work_struct *work)
+{
+ struct net_bridge *br = container_of(work, struct net_bridge,
+ src_gc_work);
+ HLIST_HEAD(deleted_head);
+
+ spin_lock_bh(&br->multicast_lock);
+ hlist_move_list(&br->src_gc_list, &deleted_head);
+ spin_unlock_bh(&br->multicast_lock);
+
+ __grp_src_gc(&deleted_head);
+}
+
void br_multicast_init(struct net_bridge *br)
{
br->hash_max = BR_MULTICAST_DEFAULT_HASH_MAX;
@@ -1821,6 +1943,8 @@ void br_multicast_init(struct net_bridge *br)
br_ip6_multicast_query_expired, 0);
#endif
INIT_HLIST_HEAD(&br->mdb_list);
+ INIT_HLIST_HEAD(&br->src_gc_list);
+ INIT_WORK(&br->src_gc_work, br_multicast_src_gc);
}
static void br_ip4_multicast_join_snoopers(struct net_bridge *br)
@@ -1924,6 +2048,7 @@ void br_multicast_stop(struct net_bridge *br)
void br_multicast_dev_del(struct net_bridge *br)
{
struct net_bridge_mdb_entry *mp;
+ HLIST_HEAD(deleted_head);
struct hlist_node *tmp;
spin_lock_bh(&br->multicast_lock);
@@ -1934,8 +2059,12 @@ void br_multicast_dev_del(struct net_bridge *br)
hlist_del_rcu(&mp->mdb_node);
kfree_rcu(mp, rcu);
}
+ hlist_move_list(&br->src_gc_list, &deleted_head);
spin_unlock_bh(&br->multicast_lock);
+ __grp_src_gc(&deleted_head);
+ cancel_work_sync(&br->src_gc_work);
+
rcu_barrier();
}
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 357b6905ecef..311ad0e402dc 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -214,13 +214,34 @@ struct net_bridge_fdb_entry {
#define MDB_PG_FLAGS_OFFLOAD BIT(1)
#define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
+#define PG_SRC_ENT_LIMIT 32
+
+#define BR_SGRP_F_DELETE BIT(0)
+#define BR_SGRP_F_SEND BIT(1)
+
+struct net_bridge_group_src {
+ struct hlist_node node;
+
+ struct br_ip addr;
+ struct net_bridge_port_group *pg;
+ u8 flags;
+ struct timer_list timer;
+
+ struct net_bridge *br;
+ struct hlist_node del_node;
+ struct rcu_head rcu;
+};
+
struct net_bridge_port_group {
struct net_bridge_port *port;
struct net_bridge_port_group __rcu *next;
struct br_ip addr;
unsigned char eth_addr[ETH_ALEN] __aligned(2);
unsigned char flags;
+ unsigned char filter_mode;
+ struct hlist_head src_list;
+ unsigned int src_ents;
struct timer_list timer;
struct hlist_node mglist;
@@ -410,6 +431,7 @@ struct net_bridge {
struct rhashtable mdb_hash_tbl;
+ struct hlist_head src_gc_list;
struct hlist_head mdb_list;
struct hlist_head router_list;
@@ -423,6 +445,7 @@ struct net_bridge {
struct bridge_mcast_own_query ip6_own_query;
struct bridge_mcast_querier ip6_querier;
#endif /* IS_ENABLED(CONFIG_IPV6) */
+ struct work_struct src_gc_work;
#endif
struct timer_list hello_timer;
--
2.25.4
