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authorStephen Hemminger <shemminger@linux-foundation.org>2007-03-21 13:42:06 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:28:45 -0700
commit467aea0ddfd1f0f1158c57cbef0e8941dd63374c (patch)
treeb5bcccfd80d189a67cd347940ceee916a8d5cf22
parent6229e362dd49b9e8387126bd4483ab0574d23e9c (diff)
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bridge: don't route packets while learning
While in the STP learning state, don't route packets; wait until forwarding delay has expired. The purpose of the forwarding delay is to detect loops in the network, and if a brouter started up and started forwarding, it could cause a flood. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
-rw-r--r--net/bridge/br_input.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index 2f5c379d9ffa..8a5527632092 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -129,7 +129,7 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
const unsigned char *dest = eth_hdr(skb)->h_dest;
if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
- goto err;
+ goto drop;
if (unlikely(is_link_local(dest))) {
skb->pkt_type = PACKET_HOST;
@@ -138,22 +138,25 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
NULL, br_handle_local_finish) == 0) ? skb : NULL;
}
- if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {
+ switch (p->state) {
+ case BR_STATE_FORWARDING:
+
if (br_should_route_hook) {
if (br_should_route_hook(&skb))
return skb;
dest = eth_hdr(skb)->h_dest;
}
-
+ /* fall through */
+ case BR_STATE_LEARNING:
if (!compare_ether_addr(p->br->dev->dev_addr, dest))
skb->pkt_type = PACKET_HOST;
NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
br_handle_frame_finish);
- return NULL;
+ break;
+ default:
+drop:
+ kfree_skb(skb);
}
-
-err:
- kfree_skb(skb);
return NULL;
}