netfilter: nf_tables: force module load in case select_ops() returns -EAGAIN

nft_meta needs to pull in the nft_meta_bridge module in case that this
is a bridge family rule from the select_ops() path.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_tables_api.c

@@ -2144,6 +2144,12 @@ static int nf_tables_expr_parse(const struct nft_ctx *ctx,
 				       (const struct nlattr * const *)info->tb);
 		if (IS_ERR(ops)) {
 			err = PTR_ERR(ops);
+#ifdef CONFIG_MODULES
+			if (err == -EAGAIN)
+				nft_expr_type_request_module(ctx->net,
+							     ctx->family,
+							     tb[NFTA_EXPR_NAME]);
+#endif
 			goto err1;
 		}
 	} else

net/netfilter/nft_meta.c

@@ -519,6 +519,10 @@ nft_meta_select_ops(const struct nft_ctx *ctx,
 	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
 		return ERR_PTR(-EINVAL);
 
+#ifdef CONFIG_NF_TABLES_BRIDGE
+	if (ctx->family == NFPROTO_BRIDGE)
+		return ERR_PTR(-EAGAIN);
+#endif
 	if (tb[NFTA_META_DREG])
 		return &nft_meta_get_ops;