[XFRM]: BEET mode

This patch introduces the BEET mode (Bound End-to-End Tunnel) with as
specified by the ietf draft at the following link:

http://www.ietf.org/internet-drafts/draft-nikander-esp-beet-mode-06.txt

The patch provides only single family support (i.e. inner family =
outer family).

Signed-off-by: Diego Beltrami <diego.beltrami@gmail.com>
Signed-off-by: Miika Komu     <miika@iki.fi>
Signed-off-by: Herbert Xu     <herbert@gondor.apana.org.au>
Signed-off-by: Abhinav Pathak <abhinav.pathak@hiit.fi>
Signed-off-by: Jeff Ahrenholz <ahrenholz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/ip.h b/include/linux/ip.h
index 6b25d36fc54c..ecee9bb27d0e 100644
--- a/include/linux/ip.h
+++ b/include/linux/ip.h
@@ -80,6 +80,8 @@
 #define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
 #define IPOPT_TS_PRESPEC        3               /* specified modules only */
 
+#define IPV4_BEET_PHMAXLEN 8
+
 struct iphdr {
 #if defined(__LITTLE_ENDIAN_BITFIELD)
         __u8    ihl:4,
@@ -123,4 +125,11 @@ struct ip_comp_hdr {
         __be16 cpi;
 };
 
+struct ip_beet_phdr {
+        __u8 nexthdr;
+        __u8 hdrlen;
+        __u8 padlen;
+        __u8 reserved;
+};
+
 #endif  /* _LINUX_IP_H */