Commit aa7da937 authored Mar 07, 2015 by Eric W. Biederman Committed by David S. Miller Mar 08, 2015

mpls: Correct the ttl decrement.



According to RFC3032 section 2.4.2  packets with an outgoing
ttl of 0 MUST NOT be forwarded.  According to section 2.4.1
an outgoing TTL of 0 comes from an incomming TTL <= 1.

Therefore any packets that is received with a ttl <= 1 should
not have it's ttl decremented and forwarded.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 0f7bbd58

net/mpls/af_mpls.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -162,7 +162,7 @@ static int mpls_forward(struct sk_buff skb, struct net_device dev,
		skb_forward_csum(skb);

		/* Verify ttl is valid */
		if (dec.ttl <= 2)
		if (dec.ttl <= 1)
		goto drop;
		dec.ttl -= 1;