From c2886d6259b8faac4c05ffd9c3c401ac84478de0 Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Wed, 25 Apr 2007 22:07:58 -0700 Subject: [PATCH] [BRIDGE]: if no STP then forward all BPDUs If a bridge is not running STP, then it has no way to detect a cycle in the network. But if it is not running STP and some other machine or device is running STP, then if STP BPDU's get forwarded to it can detect the cycle. This is how the old 2.4 and early 2.6 code worked. Signed-off-by: Stephen Hemminger Signed-off-by: David S. Miller --- net/bridge/br_input.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c index 5662567c8a..420bbb9955 100644 --- a/net/bridge/br_input.c +++ b/net/bridge/br_input.c @@ -136,8 +136,14 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb) if (skb->protocol == htons(ETH_P_PAUSE)) goto drop; - return (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev, - NULL, br_handle_local_finish) == 0) ? skb : NULL; + /* Process STP BPDU's through normal netif_receive_skb() path */ + if (p->br->stp_enabled != BR_NO_STP) { + if (NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev, + NULL, br_handle_local_finish)) + return NULL; + else + return skb; + } } switch (p->state) { -- 2.39.5