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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: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Thomas Graf 2007-12-10 16:53:05 -08:00 committed by David S. Miller
parent a4e65d36a9
commit 2017a72c07
1 changed files with 5 additions and 0 deletions
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5
net/ipv4/esp4.c
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@ -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;