[NETFILTER] nfnetlink: only load subsystems if CAP_NET_ADMIN is set

Without this patch, any user can cause nfnetlink subsystems to be
autoloaded.  Those subsystems however could add significant processing
overhead to packet processing, and would refuse any configuration messages
from non-CAP_NET_ADMIN processes anyway.

This patch follows a suggestion from Patrick McHardy.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netfilter/nfnetlink.c

@@ -240,15 +240,18 @@ static inline int nfnetlink_rcv_msg(struct sk_buff *skb,
 	ss = nfnetlink_get_subsys(type);
 	if (!ss) {
 #ifdef CONFIG_KMOD
-		/* don't call nfnl_shunlock, since it would reenter
-		 * with further packet processing */
-		up(&nfnl_sem);
-		request_module("nfnetlink-subsys-%d", NFNL_SUBSYS_ID(type));
-		nfnl_shlock();
-		ss = nfnetlink_get_subsys(type);
+		if (cap_raised(NETLINK_CB(skb).eff_cap, CAP_NET_ADMIN)) {
+			/* don't call nfnl_shunlock, since it would reenter
+			 * with further packet processing */
+			up(&nfnl_sem);
+			request_module("nfnetlink-subsys-%d",
+					NFNL_SUBSYS_ID(type));
+			nfnl_shlock();
+			ss = nfnetlink_get_subsys(type);
+		}
 		if (!ss)
 #endif
-		goto err_inval;
+			goto err_inval;
 	}
 
 	nc = nfnetlink_find_client(type, ss);