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authorThomas Graf <tgraf@suug.ch>2007-12-10 16:53:05 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-12-11 02:45:26 -0800
commit2017a72c070033830b460d31cd4703f9d2ec0d56 (patch)
tree1f9b9cace02c54739fbc36430bd685ee4d0806fe
parenta4e65d36a959005f14142535b58c44cd0f1de8cb (diff)
downloadop-kernel-dev-2017a72c070033830b460d31cd4703f9d2ec0d56.zip
op-kernel-dev-2017a72c070033830b460d31cd4703f9d2ec0d56.tar.gz
[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>
-rw-r--r--net/ipv4/esp4.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index c31bccb..1738113 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -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;
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