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| author | Stephen Hemminger <shemminger@linux-foundation.org> | 2007-03-21 13:42:06 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-04-25 22:28:45 -0700 |
| commit | 467aea0ddfd1f0f1158c57cbef0e8941dd63374c (patch) | |
| tree | b5bcccfd80d189a67cd347940ceee916a8d5cf22 | |
| parent | 6229e362dd49b9e8387126bd4483ab0574d23e9c (diff) | |
| download | linux-467aea0ddfd1f0f1158c57cbef0e8941dd63374c.tar.gz linux-467aea0ddfd1f0f1158c57cbef0e8941dd63374c.tar.bz2 linux-467aea0ddfd1f0f1158c57cbef0e8941dd63374c.zip | |
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.c | 17 |
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; } |