net: evaluate net.ipvX.conf.all.disable_policy and disable_xfrm

The disable_policy and disable_xfrm are a per-interface sysctl to
disable IPsec policy or encryption on an interface. However, while a
"all" variant is exposed, it was a noop since it was never evaluated.
We use the usual "or" logic for this kind of sysctls.
Signed-off-by: Vincent Bernat <vincent@bernat.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/ipv4/route.c

@@ -1741,7 +1741,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 		flags |= RTCF_LOCAL;
 
 	rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false);
+			   IN_DEV_ORCONF(in_dev, NOPOLICY), false);
 	if (!rth)
 		return -ENOBUFS;
 
@@ -1857,8 +1857,8 @@ static int __mkroute_input(struct sk_buff *skb,
 	}
 
 	rth = rt_dst_alloc(out_dev->dev, 0, res->type,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY),
-			   IN_DEV_CONF_GET(out_dev, NOXFRM));
+			   IN_DEV_ORCONF(in_dev, NOPOLICY),
+			   IN_DEV_ORCONF(out_dev, NOXFRM));
 	if (!rth) {
 		err = -ENOBUFS;
 		goto cleanup;
@@ -2227,7 +2227,7 @@ out:	return err;
 
 	rth = rt_dst_alloc(l3mdev_master_dev_rcu(dev) ? : net->loopback_dev,
 			   flags | RTCF_LOCAL, res->type,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY), false);
+			   IN_DEV_ORCONF(in_dev, NOPOLICY), false);
 	if (!rth)
 		goto e_nobufs;
 
@@ -2450,8 +2450,8 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
 
 add:
 	rth = rt_dst_alloc(dev_out, flags, type,
-			   IN_DEV_CONF_GET(in_dev, NOPOLICY),
-			   IN_DEV_CONF_GET(in_dev, NOXFRM));
+			   IN_DEV_ORCONF(in_dev, NOPOLICY),
+			   IN_DEV_ORCONF(in_dev, NOXFRM));
 	if (!rth)
 		return ERR_PTR(-ENOBUFS);