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Commit bd2bbdb4 authored by Florian Westphal's avatar Florian Westphal Committed by Pablo Neira Ayuso
Browse files

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: default avatarFlorian Westphal <fw@strlen.de>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 99a0efbe

include/net/netfilter/nft_meta.h

deleted100644 → 0
+0 −44
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _NFT_META_H_

#define _NFT_META_H_



struct nft_meta {

	enum nft_meta_keys	key:8;

	union {

		enum nft_registers	dreg:8;

		enum nft_registers	sreg:8;

	};

};



extern const struct nla_policy nft_meta_policy[];



int nft_meta_get_init(const struct nft_ctx *ctx,

		      const struct nft_expr *expr,

		      const struct nlattr * const tb[]);



int nft_meta_set_init(const struct nft_ctx *ctx,

		      const struct nft_expr *expr,

		      const struct nlattr * const tb[]);



int nft_meta_get_dump(struct sk_buff *skb,

		      const struct nft_expr *expr);



int nft_meta_set_dump(struct sk_buff *skb,

		      const struct nft_expr *expr);



void nft_meta_get_eval(const struct nft_expr *expr,

		       struct nft_regs *regs,

		       const struct nft_pktinfo *pkt);



void nft_meta_set_eval(const struct nft_expr *expr,

		       struct nft_regs *regs,

		       const struct nft_pktinfo *pkt);



void nft_meta_set_destroy(const struct nft_ctx *ctx,

			  const struct nft_expr *expr);



int nft_meta_set_validate(const struct nft_ctx *ctx,

			  const struct nft_expr *expr,

			  const struct nft_data **data);



#endif

net/bridge/netfilter/Kconfig

+0 −7
Original line number Diff line number Diff line
@@ -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

net/bridge/netfilter/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -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

net/bridge/netfilter/nft_meta_bridge.c

deleted100644 → 0
+0 −135
Original line number Diff line number Diff line 
/*

 * 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");

net/netfilter/nft_meta.c

+58 −32
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>

 * Copyright (c) 2014 Intel Corporation

 * Author: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

 *

 * 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
@@ -24,13 +26,24 @@ 
#include <net/tcp_states.h> /* for TCP_TIME_WAIT */

#include <net/netfilter/nf_tables.h>

#include <net/netfilter/nf_tables_core.h>

#include <net/netfilter/nft_meta.h>



#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */



struct nft_meta {

	enum nft_meta_keys	key:8;

	union {

		enum nft_registers	dreg:8;

		enum nft_registers	sreg:8;

	};

};



static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);



void nft_meta_get_eval(const struct nft_expr *expr,

#ifdef CONFIG_NF_TABLES_BRIDGE

#include "../bridge/br_private.h"

#endif



static void nft_meta_get_eval(const struct nft_expr *expr,

			      struct nft_regs *regs,

			      const struct nft_pktinfo *pkt)

{
@@ -39,6 +52,9 @@ void nft_meta_get_eval(const struct nft_expr *expr, 
	const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);

	struct sock *sk;

	u32 *dest = &regs->data[priv->dreg];

#ifdef CONFIG_NF_TABLES_BRIDGE

	const struct net_bridge_port *p;

#endif



	switch (priv->key) {

	case NFT_META_LEN:
@@ -214,6 +230,18 @@ void nft_meta_get_eval(const struct nft_expr *expr, 
	case NFT_META_SECPATH:

		nft_reg_store8(dest, !!skb->sp);

		break;

#endif

#ifdef CONFIG_NF_TABLES_BRIDGE

	case NFT_META_BRI_IIFNAME:

		if (in == NULL || (p = br_port_get_rcu(in)) == NULL)

			goto err;

		strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);

		return;

	case NFT_META_BRI_OIFNAME:

		if (out == NULL || (p = br_port_get_rcu(out)) == NULL)

			goto err;

		strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);

		return;

#endif

	default:

		WARN_ON(1);
@@ -224,9 +252,8 @@ void nft_meta_get_eval(const struct nft_expr *expr, 
err:

	regs->verdict.code = NFT_BREAK;

}

EXPORT_SYMBOL_GPL(nft_meta_get_eval);



void nft_meta_set_eval(const struct nft_expr *expr,

static void nft_meta_set_eval(const struct nft_expr *expr,

			      struct nft_regs *regs,

			       const struct nft_pktinfo *pkt)

{
@@ -258,16 +285,14 @@ void nft_meta_set_eval(const struct nft_expr *expr, 
		WARN_ON(1);

	}

}

EXPORT_SYMBOL_GPL(nft_meta_set_eval);



const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {

static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {

	[NFTA_META_DREG]	= { .type = NLA_U32 },

	[NFTA_META_KEY]		= { .type = NLA_U32 },

	[NFTA_META_SREG]	= { .type = NLA_U32 },

};

EXPORT_SYMBOL_GPL(nft_meta_policy);



int nft_meta_get_init(const struct nft_ctx *ctx,

static int nft_meta_get_init(const struct nft_ctx *ctx,

			     const struct nft_expr *expr,

			     const struct nlattr * const tb[])

{
@@ -317,6 +342,14 @@ int nft_meta_get_init(const struct nft_ctx *ctx, 
	case NFT_META_SECPATH:

		len = sizeof(u8);

		break;

#endif

#ifdef CONFIG_NF_TABLES_BRIDGE

	case NFT_META_BRI_IIFNAME:

	case NFT_META_BRI_OIFNAME:

		if (ctx->family != NFPROTO_BRIDGE)

			return -EOPNOTSUPP;

		len = IFNAMSIZ;

		break;

#endif

	default:

		return -EOPNOTSUPP;
@@ -326,7 +359,6 @@ int nft_meta_get_init(const struct nft_ctx *ctx, 
	return nft_validate_register_store(ctx, priv->dreg, NULL,

					   NFT_DATA_VALUE, len);

}

EXPORT_SYMBOL_GPL(nft_meta_get_init);



static int nft_meta_get_validate(const struct nft_ctx *ctx,

				 const struct nft_expr *expr,
@@ -360,7 +392,7 @@ static int nft_meta_get_validate(const struct nft_ctx *ctx, 
#endif

}



int nft_meta_set_validate(const struct nft_ctx *ctx,

static int nft_meta_set_validate(const struct nft_ctx *ctx,

				 const struct nft_expr *expr,

				 const struct nft_data **data)

{
@@ -388,9 +420,8 @@ int nft_meta_set_validate(const struct nft_ctx *ctx, 


	return nft_chain_validate_hooks(ctx->chain, hooks);

}

EXPORT_SYMBOL_GPL(nft_meta_set_validate);



int nft_meta_set_init(const struct nft_ctx *ctx,

static int nft_meta_set_init(const struct nft_ctx *ctx,

			     const struct nft_expr *expr,

			     const struct nlattr * const tb[])

{
@@ -424,9 +455,8 @@ int nft_meta_set_init(const struct nft_ctx *ctx, 


	return 0;

}

EXPORT_SYMBOL_GPL(nft_meta_set_init);



int nft_meta_get_dump(struct sk_buff *skb,

static int nft_meta_get_dump(struct sk_buff *skb,

			     const struct nft_expr *expr)

{

	const struct nft_meta *priv = nft_expr_priv(expr);
@@ -440,10 +470,8 @@ int nft_meta_get_dump(struct sk_buff *skb, 
nla_put_failure:

	return -1;

}

EXPORT_SYMBOL_GPL(nft_meta_get_dump);



int nft_meta_set_dump(struct sk_buff *skb,

		      const struct nft_expr *expr)

static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)

{

	const struct nft_meta *priv = nft_expr_priv(expr);
@@ -457,9 +485,8 @@ int nft_meta_set_dump(struct sk_buff *skb, 
nla_put_failure:

	return -1;

}

EXPORT_SYMBOL_GPL(nft_meta_set_dump);



void nft_meta_set_destroy(const struct nft_ctx *ctx,

static void nft_meta_set_destroy(const struct nft_ctx *ctx,

				 const struct nft_expr *expr)

{

	const struct nft_meta *priv = nft_expr_priv(expr);
@@ -467,7 +494,6 @@ void nft_meta_set_destroy(const struct nft_ctx *ctx, 
	if (priv->key == NFT_META_NFTRACE)

		static_branch_dec(&nft_trace_enabled);

}

EXPORT_SYMBOL_GPL(nft_meta_set_destroy);



static struct nft_expr_type nft_meta_type;

static const struct nft_expr_ops nft_meta_get_ops = {