bridge: Add multicast data-path hooks

This patch finally hooks up the multicast snooping module to the
data path.  In particular, all multicast packets passing through
the bridge are fed into the module and switched by it.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 1 deletions

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index edfdaef44296..53b39851d87d 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -41,6 +41,7 @@ int br_handle_frame_finish(struct sk_buff *skb)
         struct net_bridge_port *p = rcu_dereference(skb->dev->br_port);
         struct net_bridge *br;
         struct net_bridge_fdb_entry *dst;
+        struct net_bridge_mdb_entry *mdst;
         struct sk_buff *skb2;
 
         if (!p || p->state == BR_STATE_DISABLED)
@@ -50,6 +51,10 @@ int br_handle_frame_finish(struct sk_buff *skb)
         br = p->br;
         br_fdb_update(br, p, eth_hdr(skb)->h_source);
 
+        if (is_multicast_ether_addr(dest) &&
+            br_multicast_rcv(br, p, skb))
+                goto drop;
+
         if (p->state == BR_STATE_LEARNING)
                 goto drop;
 
@@ -64,8 +69,19 @@ int br_handle_frame_finish(struct sk_buff *skb)
         dst = NULL;
 
         if (is_multicast_ether_addr(dest)) {
+                mdst = br_mdb_get(br, skb);
+                if (mdst || BR_INPUT_SKB_CB(skb)->mrouters_only) {
+                        if ((mdst && !hlist_unhashed(&mdst->mglist)) ||
+                            br_multicast_is_router(br))
+                                skb2 = skb;
+                        br_multicast_forward(mdst, skb, skb2);
+                        skb = NULL;
+                        if (!skb2)
+                                goto out;
+                } else
+                        skb2 = skb;
+
                 br->dev->stats.multicast++;
-                skb2 = skb;
         } else if ((dst = __br_fdb_get(br, dest)) && dst->is_local) {
                 skb2 = skb;
                 /* Do not forward the packet since it's local. */