Commit aa7da937 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by David S. Miller

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: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0f7bbd58
...@@ -162,7 +162,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev, ...@@ -162,7 +162,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
skb_forward_csum(skb); skb_forward_csum(skb);
/* Verify ttl is valid */ /* Verify ttl is valid */
if (dec.ttl <= 2) if (dec.ttl <= 1)
goto drop; goto drop;
dec.ttl -= 1; dec.ttl -= 1;
......
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