mac80211: keep mesh ifaces in allmulti mode

Currently a mesh node will not forward a multicast frame if it is not subscribed
to the specific multicast address. This patch addresses the issue and fixes mesh
multicast forwarding.

Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 0c02c471bca2..aa5a191598c9 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -245,10 +245,13 @@ static int ieee80211_open(struct net_device *dev)
         case IEEE80211_IF_TYPE_AP:
                 sdata->bss = &sdata->u.ap;
                 break;
+        case IEEE80211_IF_TYPE_MESH_POINT:
+                /* mesh ifaces must set allmulti to forward mcast traffic */
+                atomic_inc(&local->iff_allmultis);
+                break;
         case IEEE80211_IF_TYPE_STA:
         case IEEE80211_IF_TYPE_MNTR:
         case IEEE80211_IF_TYPE_IBSS:
-        case IEEE80211_IF_TYPE_MESH_POINT:
                 /* no special treatment */
                 break;
         case IEEE80211_IF_TYPE_INVALID:
@@ -495,6 +498,9 @@ static int ieee80211_stop(struct net_device *dev)
                 netif_addr_unlock_bh(local->mdev);
                 break;
         case IEEE80211_IF_TYPE_MESH_POINT:
+                /* allmulti is always set on mesh ifaces */
+                atomic_dec(&local->iff_allmultis);
+                /* fall through */
         case IEEE80211_IF_TYPE_STA:
         case IEEE80211_IF_TYPE_IBSS:
                 sdata->u.sta.state = IEEE80211_DISABLED;