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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>
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6229e362dd
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@ -129,7 +129,7 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
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const unsigned char *dest = eth_hdr(skb)->h_dest;
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if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
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goto err;
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goto drop;
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if (unlikely(is_link_local(dest))) {
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skb->pkt_type = PACKET_HOST;
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@ -138,22 +138,25 @@ struct sk_buff *br_handle_frame(struct net_bridge_port *p, struct sk_buff *skb)
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NULL, br_handle_local_finish) == 0) ? skb : NULL;
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}
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if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {
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switch (p->state) {
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case BR_STATE_FORWARDING:
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if (br_should_route_hook) {
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if (br_should_route_hook(&skb))
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return skb;
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dest = eth_hdr(skb)->h_dest;
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}
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/* fall through */
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case BR_STATE_LEARNING:
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if (!compare_ether_addr(p->br->dev->dev_addr, dest))
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skb->pkt_type = PACKET_HOST;
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NF_HOOK(PF_BRIDGE, NF_BR_PRE_ROUTING, skb, skb->dev, NULL,
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br_handle_frame_finish);
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return NULL;
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break;
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default:
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drop:
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kfree_skb(skb);
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}
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err:
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kfree_skb(skb);
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return NULL;
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}
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