Commit c2886d62 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[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: default avatarStephen Hemminger <>
Signed-off-by: default avatarDavid S. Miller <>
parent 2111f8b9
......@@ -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;
return skb;
switch (p->state) {
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