[IPSEC]: Restrict socket policy loading to CAP_NET_ADMIN.

The interface needs much redesigning if we wish to allow
normal users to do this in some way.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ipv6_sockglue.c

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index f3ef4c3..3bc144a 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -504,6 +504,9 @@
 		break;
 	case IPV6_IPSEC_POLICY:
 	case IPV6_XFRM_POLICY:
+		retv = -EPERM;
+		if (!capable(CAP_NET_ADMIN))
+			break;
 		retv = xfrm_user_policy(sk, optname, optval, optlen);
 		break;