netfilter: merge meta_bridge into nft_meta

It overcomplicates things for no reason.
nft_meta_bridge only offers retrieval of bridge port interface name.

Because of this being its own module, we had to export all nft_meta
functions, which we can then make static again (which even reduces
the size of nft_meta -- including bridge port retrieval...):

before:
   text    data     bss     dec     hex filename
   1838     832       0    2670     a6e net/bridge/netfilter/nft_meta_bridge.ko
   6147     936       1    7084    1bac net/netfilter/nft_meta.ko

after:
   5826     936       1    6763    1a6b net/netfilter/nft_meta.ko

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

3 files changed, 0 insertions, 143 deletions

diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index f212447794bd..9a0159aebe1a 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -8,13 +8,6 @@ menuconfig NF_TABLES_BRIDGE
 	bool "Ethernet Bridge nf_tables support"
 
 if NF_TABLES_BRIDGE
-
-config NFT_BRIDGE_META
-	tristate "Netfilter nf_table bridge meta support"
-	depends on NFT_META
-	help
-	  Add support for bridge dedicated meta key.
-
 config NFT_BRIDGE_REJECT
 	tristate "Netfilter nf_tables bridge reject support"
 	depends on NFT_REJECT && NFT_REJECT_IPV4 && NFT_REJECT_IPV6
diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile
index 4bc758dd4a8c..9b868861f21a 100644
--- a/net/bridge/netfilter/Makefile
+++ b/net/bridge/netfilter/Makefile
@@ -3,7 +3,6 @@
 # Makefile for the netfilter modules for Link Layer filtering on a bridge.
 #
 
-obj-$(CONFIG_NFT_BRIDGE_META)  += nft_meta_bridge.o
 obj-$(CONFIG_NFT_BRIDGE_REJECT)  += nft_reject_bridge.o
 
 # packet logging
diff --git a/net/bridge/netfilter/nft_meta_bridge.c b/net/bridge/netfilter/nft_meta_bridge.c
deleted file mode 100644
index bb63c9aed55d..000000000000
--- a/net/bridge/netfilter/nft_meta_bridge.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * Copyright (c) 2014 Intel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/netlink.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter/nf_tables.h>
-#include <net/netfilter/nf_tables.h>
-#include <net/netfilter/nft_meta.h>
-
-#include "../br_private.h"
-
-static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
-				     struct nft_regs *regs,
-				     const struct nft_pktinfo *pkt)
-{
-	const struct nft_meta *priv = nft_expr_priv(expr);
-	const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
-	u32 *dest = &regs->data[priv->dreg];
-	const struct net_bridge_port *p;
-
-	switch (priv->key) {
-	case NFT_META_BRI_IIFNAME:
-		if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
-			goto err;
-		break;
-	case NFT_META_BRI_OIFNAME:
-		if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
-			goto err;
-		break;
-	default:
-		goto out;
-	}
-
-	strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
-	return;
-out:
-	return nft_meta_get_eval(expr, regs, pkt);
-err:
-	regs->verdict.code = NFT_BREAK;
-}
-
-static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
-				    const struct nft_expr *expr,
-				    const struct nlattr * const tb[])
-{
-	struct nft_meta *priv = nft_expr_priv(expr);
-	unsigned int len;
-
-	priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
-	switch (priv->key) {
-	case NFT_META_BRI_IIFNAME:
-	case NFT_META_BRI_OIFNAME:
-		len = IFNAMSIZ;
-		break;
-	default:
-		return nft_meta_get_init(ctx, expr, tb);
-	}
-
-	priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
-	return nft_validate_register_store(ctx, priv->dreg, NULL,
-					   NFT_DATA_VALUE, len);
-}
-
-static struct nft_expr_type nft_meta_bridge_type;
-static const struct nft_expr_ops nft_meta_bridge_get_ops = {
-	.type		= &nft_meta_bridge_type,
-	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
-	.eval		= nft_meta_bridge_get_eval,
-	.init		= nft_meta_bridge_get_init,
-	.dump		= nft_meta_get_dump,
-};
-
-static const struct nft_expr_ops nft_meta_bridge_set_ops = {
-	.type		= &nft_meta_bridge_type,
-	.size		= NFT_EXPR_SIZE(sizeof(struct nft_meta)),
-	.eval		= nft_meta_set_eval,
-	.init		= nft_meta_set_init,
-	.destroy	= nft_meta_set_destroy,
-	.dump		= nft_meta_set_dump,
-	.validate	= nft_meta_set_validate,
-};
-
-static const struct nft_expr_ops *
-nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
-			   const struct nlattr * const tb[])
-{
-	if (tb[NFTA_META_KEY] == NULL)
-		return ERR_PTR(-EINVAL);
-
-	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
-		return ERR_PTR(-EINVAL);
-
-	if (tb[NFTA_META_DREG])
-		return &nft_meta_bridge_get_ops;
-
-	if (tb[NFTA_META_SREG])
-		return &nft_meta_bridge_set_ops;
-
-	return ERR_PTR(-EINVAL);
-}
-
-static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
-	.family         = NFPROTO_BRIDGE,
-	.name           = "meta",
-	.select_ops     = nft_meta_bridge_select_ops,
-	.policy         = nft_meta_policy,
-	.maxattr        = NFTA_META_MAX,
-	.owner          = THIS_MODULE,
-};
-
-static int __init nft_meta_bridge_module_init(void)
-{
-	return nft_register_expr(&nft_meta_bridge_type);
-}
-
-static void __exit nft_meta_bridge_module_exit(void)
-{
-	nft_unregister_expr(&nft_meta_bridge_type);
-}
-
-module_init(nft_meta_bridge_module_init);
-module_exit(nft_meta_bridge_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>");
-MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");