[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, 4 insertions, 1 deletions

diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index a2860e35efd7..71f59f18ede8 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -199,6 +199,7 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
 {
         struct xfrm_state *t = NULL;
+        u8 mode = XFRM_MODE_TUNNEL;
 
         t = xfrm_state_alloc();
         if (!t)
@@ -212,7 +213,9 @@ static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
         memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
         memcpy(&t->sel, &x->sel, sizeof(t->sel));
         t->props.family = AF_INET6;
-        t->props.mode = XFRM_MODE_TUNNEL;
+        if (x->props.mode == XFRM_MODE_BEET)
+                mode = x->props.mode;
+        t->props.mode = mode;
         memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
 
         if (xfrm_init_state(t))