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Commit 2017a72c authored by Thomas Graf's avatar Thomas Graf Committed by David S. Miller
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[IPv4] 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: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a4e65d36

net/ipv4/esp4.c

+5 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#include <linux/pfkeyv2.h>

#include <linux/random.h>

#include <linux/spinlock.h>

#include <linux/in6.h>

#include <net/icmp.h>

#include <net/protocol.h>

#include <net/udp.h>
@@ -224,6 +225,10 @@ static int esp_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)

		goto out;



	iph = ip_hdr(skb);

	ihl = iph->ihl * 4;