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[IPv6] ESP: Discard dummy packets introduced in rfc4303

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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>
This commit is contained in:
Thomas Graf 2007-12-10 16:53:29 -08:00 committed by David S. Miller
parent 2017a72c07
commit 95a02cfd4d
1 changed files with 6 additions and 0 deletions
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6
net/ipv6/esp6.c
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@ -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];
}