From 2017a72c070033830b460d31cd4703f9d2ec0d56 Mon Sep 17 00:00:00 2001 From: Thomas Graf Date: Mon, 10 Dec 2007 16:53:05 -0800 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- net/ipv4/esp4.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index c31bccb9b526..1738113268bc 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -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; -- 2.30.2