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>
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 5c99e3f..e120074 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -162,7 +162,7 @@
skb_forward_csum(skb);
/* Verify ttl is valid */
- if (dec.ttl <= 2)
+ if (dec.ttl <= 1)
goto drop;
dec.ttl -= 1;