netfilter: nf_tables: increase maximum devices number per flowtable

Rise the maximum limit of devices per flowtable up to 256. Rename
NFT_FLOWTABLE_DEVICE_MAX to NFT_NETDEVICE_MAX in preparation to reuse
the netdev hook parser for ingress basechain.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

include/net/netfilter/nf_tables.h

@@ -1152,7 +1152,7 @@ struct nft_object_ops {
 int nft_register_obj(struct nft_object_type *obj_type);
 void nft_unregister_obj(struct nft_object_type *obj_type);
 
-#define NFT_FLOWTABLE_DEVICE_MAX	8
+#define NFT_NETDEVICE_MAX	256
 
 /**
  *	struct nft_flowtable - nf_tables flow table

net/netfilter/nf_tables_api.c

@@ -1577,7 +1577,7 @@ static int nf_tables_parse_netdev_hooks(struct net *net,
 		list_add_tail(&hook->list, hook_list);
 		n++;
 
-		if (n == NFT_FLOWTABLE_DEVICE_MAX) {
+		if (n == NFT_NETDEVICE_MAX) {
 			err = -EFBIG;
 			goto err_hook;
 		}