xfrm: Add a XFRM_STATE_AF_UNSPEC flag to xfrm_usersa_info

Add a XFRM_STATE_AF_UNSPEC flag to handle the AF_UNSPEC behavior for the selector family. Userspace applications can set this flag to leave the selector family of the xfrm_state unspecified. This can be used to to handle inter family tunnels if the selector is not set from userspace. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Jul 10, 2008 · ccf9b3b · ccf9b3b
1 parent 0ce2855
commit ccf9b3b
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
@@ -339,6 +339,7 @@ struct xfrm_usersa_info {
 #define XFRM_STATE_NOPMTUDISC	4
 #define XFRM_STATE_WILDRECV	8
 #define XFRM_STATE_ICMP		16
+#define XFRM_STATE_AF_UNSPEC	32
 };
 
 struct xfrm_usersa_id {

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
@@ -277,9 +277,8 @@ static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *
 	memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
 	x->props.flags = p->flags;
 
-	if (!x->sel.family)
+	if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
 		x->sel.family = p->family;
-
 }
 
 /*