bridge: apply multicast snooping to IPv6 link-local, too

The multicast snooping code should have matured enough to be safely
applicable to IPv6 link-local multicast addresses (excluding the
link-local all nodes address, ff02::1), too.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 6 insertions, 14 deletions

diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c
index e4d5cd43b7fb..de818d95c476 100644
--- a/net/bridge/br_mdb.c
+++ b/net/bridge/br_mdb.c
@@ -9,6 +9,7 @@
 #include <net/netlink.h>
 #if IS_ENABLED(CONFIG_IPV6)
 #include <net/ipv6.h>
+#include <net/addrconf.h>
 #endif
 
 #include "br_private.h"
@@ -254,7 +255,7 @@ static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
                         return false;
 #if IS_ENABLED(CONFIG_IPV6)
         } else if (entry->addr.proto == htons(ETH_P_IPV6)) {
-                if (!ipv6_is_transient_multicast(&entry->addr.u.ip6))
+                if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
                         return false;
 #endif
         } else
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 5388955b2a3c..23531471f16a 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -29,6 +29,7 @@
 #include <net/ipv6.h>
 #include <net/mld.h>
 #include <net/ip6_checksum.h>
+#include <net/addrconf.h>
 #endif
 
 #include "br_private.h"
@@ -723,7 +724,7 @@ static int br_ip6_multicast_add_group(struct net_bridge *br,
 {
         struct br_ip br_group;
 
-        if (!ipv6_is_transient_multicast(group))
+        if (ipv6_addr_is_ll_all_nodes(group))
                 return 0;
 
         br_group.u.ip6 = *group;
@@ -1354,7 +1355,7 @@ static void br_ip6_multicast_leave_group(struct net_bridge *br,
 {
         struct br_ip br_group;
 
-        if (!ipv6_is_transient_multicast(group))
+        if (ipv6_addr_is_ll_all_nodes(group))
                 return;
 
         br_group.u.ip6 = *group;
@@ -1495,7 +1496,7 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br,
                 return 0;
 
         /* Prevent flooding this packet if there is no listener present */
-        if (ipv6_is_transient_multicast(&ip6h->daddr))
+        if (!ipv6_addr_is_ll_all_nodes(&ip6h->daddr))
                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
 
         if (ip6h->nexthdr != IPPROTO_HOPOPTS ||
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index d41283c57952..89b2949be02f 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -476,16 +476,6 @@ extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 #define mlock_dereference(X, br) \
         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 
-#if IS_ENABLED(CONFIG_IPV6)
-#include <net/addrconf.h>
-static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
-{
-        if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
-                return 1;
-        return 0;
-}
-#endif
-
 static inline bool br_multicast_is_router(struct net_bridge *br)
 {
         return br->multicast_router == 2 ||