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

net/ipv4/ip_sockglue.c

@@ -848,6 +848,9 @@ int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
  
 		case IP_IPSEC_POLICY:
 		case IP_XFRM_POLICY:
+			err = -EPERM;
+			if (!capable(CAP_NET_ADMIN))
+				break;
 			err = xfrm_user_policy(sk, optname, optval, optlen);
 			break;
 

net/ipv6/ipv6_sockglue.c

@@ -504,6 +504,9 @@ int ipv6_setsockopt(struct sock *sk, int level, int optname,
 		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;