From: Stephen Hemminger Date: Fri, 15 May 2009 06:10:13 +0000 (+0000) Subject: bridge: relay bridge multicast pkgs if !STP X-Git-Tag: v2.6.30-rc7~20^2~12 X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=commitdiff_plain;h=a598f6aebea2481531b0757ed90cfb0d8cf1d8f5 bridge: relay bridge multicast pkgs if !STP Currently the bridge catches all STP packets; even if STP is turned off. This prevents other systems (which do have STP turned on) from being able to detect loops in the network. With this patch, if STP is off, then any packet sent to the STP multicast group address is forwarded to all ports. Based on earlier patch by Joakim Tjernlund with changes to go through forwarding (not local chain), and optimization that only last octet needs to be checked. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 30b8877..5ee1a36 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -134,6 +134,10 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb) if (skb->protocol == htons(ETH_P_PAUSE)) goto drop; + /* If STP is turned off, then forward */ + if (p->br->stp_enabled == BR_NO_STP && dest[5] == 0) + goto forward; + if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev, NULL, br_handle_local_finish)) return NULL; /* frame consumed by filter */ @@ -141,6 +145,7 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb) return skb; /* continue processing */ } +forward: switch (p->state) { case BR_STATE_FORWARDING: rhook = rcu_dereference(br_should_route_hook);