Commit 95a02cfd authored Dec 10, 2007 by Thomas Graf Committed by David S. Miller Dec 11, 2007

[IPv6] ESP: Discard dummy packets introduced in rfc4303



RFC4303 introduces dummy packets with a nexthdr value of 59
to implement traffic confidentiality. Such packets need to
be dropped silently and the payload may not be attempted to
be parsed as it consists of random chunk.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 2017a72c

net/ipv6/esp6.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -230,6 +230,12 @@ static int esp6_input(struct xfrm_state x, struct sk_buff skb)
		}
		/* ... check padding bits here. Silly. :-) */

		/* RFC4303: Drop dummy packets without any error */
		if (nexthdr[1] == IPPROTO_NONE) {
		ret = -EINVAL;
		goto out;
		}

		pskb_trim(skb, skb->len - alen - padlen - 2);
		ret = nexthdr[1];
		}

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