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Diffstat (limited to 'net/bridge/br_multicast.c')
-rw-r--r--net/bridge/br_multicast.c72
1 files changed, 66 insertions, 6 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 772476b7c4b7..cd3cf394c477 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1081,6 +1081,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
#endif
static bool br_ip4_multicast_select_querier(struct net_bridge *br,
+ struct net_bridge_port *port,
__be32 saddr)
{
if (!timer_pending(&br->ip4_own_query.timer) &&
@@ -1098,11 +1099,15 @@ static bool br_ip4_multicast_select_querier(struct net_bridge *br,
update:
br->ip4_querier.addr.u.ip4 = saddr;
+ /* update protected by general multicast_lock by caller */
+ rcu_assign_pointer(br->ip4_querier.port, port);
+
return true;
}
#if IS_ENABLED(CONFIG_IPV6)
static bool br_ip6_multicast_select_querier(struct net_bridge *br,
+ struct net_bridge_port *port,
struct in6_addr *saddr)
{
if (!timer_pending(&br->ip6_own_query.timer) &&
@@ -1117,19 +1122,23 @@ static bool br_ip6_multicast_select_querier(struct net_bridge *br,
update:
br->ip6_querier.addr.u.ip6 = *saddr;
+ /* update protected by general multicast_lock by caller */
+ rcu_assign_pointer(br->ip6_querier.port, port);
+
return true;
}
#endif
static bool br_multicast_select_querier(struct net_bridge *br,
+ struct net_bridge_port *port,
struct br_ip *saddr)
{
switch (saddr->proto) {
case htons(ETH_P_IP):
- return br_ip4_multicast_select_querier(br, saddr->u.ip4);
+ return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
#if IS_ENABLED(CONFIG_IPV6)
case htons(ETH_P_IPV6):
- return br_ip6_multicast_select_querier(br, &saddr->u.ip6);
+ return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
#endif
}
@@ -1201,7 +1210,7 @@ static void br_multicast_query_received(struct net_bridge *br,
struct br_ip *saddr,
unsigned long max_delay)
{
- if (!br_multicast_select_querier(br, saddr))
+ if (!br_multicast_select_querier(br, port, saddr))
return;
br_multicast_update_query_timer(br, query, max_delay);
@@ -1804,12 +1813,14 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
}
static void br_multicast_query_expired(struct net_bridge *br,
- struct bridge_mcast_own_query *query)
+ struct bridge_mcast_own_query *query,
+ struct bridge_mcast_querier *querier)
{
spin_lock(&br->multicast_lock);
if (query->startup_sent < br->multicast_startup_query_count)
query->startup_sent++;
+ rcu_assign_pointer(querier, NULL);
br_multicast_send_query(br, NULL, query);
spin_unlock(&br->multicast_lock);
}
@@ -1818,7 +1829,7 @@ static void br_ip4_multicast_query_expired(unsigned long data)
{
struct net_bridge *br = (void *)data;
- br_multicast_query_expired(br, &br->ip4_own_query);
+ br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
}
#if IS_ENABLED(CONFIG_IPV6)
@@ -1826,7 +1837,7 @@ static void br_ip6_multicast_query_expired(unsigned long data)
{
struct net_bridge *br = (void *)data;
- br_multicast_query_expired(br, &br->ip6_own_query);
+ br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
}
#endif
@@ -1849,8 +1860,10 @@ void br_multicast_init(struct net_bridge *br)
br->multicast_membership_interval = 260 * HZ;
br->ip4_other_query.delay_time = 0;
+ br->ip4_querier.port = NULL;
#if IS_ENABLED(CONFIG_IPV6)
br->ip6_other_query.delay_time = 0;
+ br->ip6_querier.port = NULL;
#endif
spin_lock_init(&br->multicast_lock);
@@ -2199,3 +2212,50 @@ unlock:
return count;
}
EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
+
+/**
+ * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
+ * @dev: The bridge port adjacent to which to check for a querier
+ * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
+ *
+ * Checks whether the given interface has a bridge on top and if so returns
+ * true if a selected querier is behind one of the other ports of this
+ * bridge. Otherwise returns false.
+ */
+bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
+{
+ struct net_bridge *br;
+ struct net_bridge_port *port;
+ bool ret = false;
+
+ rcu_read_lock();
+ if (!br_port_exists(dev))
+ goto unlock;
+
+ port = br_port_get_rcu(dev);
+ if (!port || !port->br)
+ goto unlock;
+
+ br = port->br;
+
+ switch (proto) {
+ case ETH_P_IP:
+ if (!timer_pending(&br->ip4_other_query.timer) ||
+ rcu_dereference(br->ip4_querier.port) == port)
+ goto unlock;
+ break;
+ case ETH_P_IPV6:
+ if (!timer_pending(&br->ip6_other_query.timer) ||
+ rcu_dereference(br->ip6_querier.port) == port)
+ goto unlock;
+ break;
+ default:
+ goto unlock;
+ }
+
+ ret = true;
+unlock:
+ rcu_read_unlock();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);