xfrm: Accept XFRM_STATE_AF_UNSPEC SAs on IPv4/IPv6 only hosts

Installing SAs using the XFRM_STATE_AF_UNSPEC fails on hosts with
support for one address family only. This patch accepts such SAs, even
if the processing of not supported packets will fail.

Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 2fd57f8..e25ff62 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2022,8 +2022,9 @@ int xfrm_init_state(struct xfrm_state *x)
                x->inner_mode = inner_mode;
        } else {
                struct xfrm_mode *inner_mode_iaf;
+               int iafamily = AF_INET;
 
-               inner_mode = xfrm_get_mode(x->props.mode, AF_INET);
+               inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
                if (inner_mode == NULL)
                        goto error;
 
@@ -2031,22 +2032,17 @@ int xfrm_init_state(struct xfrm_state *x)
                        xfrm_put_mode(inner_mode);
                        goto error;
                }
+               x->inner_mode = inner_mode;
 
-               inner_mode_iaf = xfrm_get_mode(x->props.mode, AF_INET6);
-               if (inner_mode_iaf == NULL)
-                       goto error;
+               if (x->props.family == AF_INET)
+                       iafamily = AF_INET6;
 
-               if (!(inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)) {
-                       xfrm_put_mode(inner_mode_iaf);
-                       goto error;
-               }
-
-               if (x->props.family == AF_INET) {
-                       x->inner_mode = inner_mode;
-                       x->inner_mode_iaf = inner_mode_iaf;
-               } else {
-                       x->inner_mode = inner_mode_iaf;
-                       x->inner_mode_iaf = inner_mode;
+               inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
+               if (inner_mode_iaf) {
+                       if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
+                               x->inner_mode_iaf = inner_mode_iaf;
+                       else
+                               xfrm_put_mode(inner_mode_iaf);
                }
        }