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Commit 85f5b308 authored by Pablo Neira Ayuso's avatar Pablo Neira Ayuso
Browse files

netfilter: bridge: add reject support 



So you can reject IPv4 and IPv6 packets from bridge tables. If the ether
proto is now known, default on dropping the packet instead.

Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
parent 8fd90bb8

net/bridge/netfilter/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -14,6 +14,12 @@ config NFT_BRIDGE_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

	help

	  Add support to reject packets.



config NF_LOG_BRIDGE

	tristate "Bridge packet logging"

net/bridge/netfilter/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 


obj-$(CONFIG_NF_TABLES_BRIDGE) += nf_tables_bridge.o

obj-$(CONFIG_NFT_BRIDGE_META)  += nft_meta_bridge.o

obj-$(CONFIG_NFT_BRIDGE_REJECT)  += nft_reject_bridge.o



# packet logging

obj-$(CONFIG_NF_LOG_BRIDGE) += nf_log_bridge.o

net/bridge/netfilter/nft_reject_bridge.c

0 → 100644
+67 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>

 *

 * 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_reject.h>



static void nft_reject_bridge_eval(const struct nft_expr *expr,

				 struct nft_data data[NFT_REG_MAX + 1],

				 const struct nft_pktinfo *pkt)

{

	switch (eth_hdr(pkt->skb)->h_proto) {

	case htons(ETH_P_IP):

		return nft_reject_ipv4_eval(expr, data, pkt);

	case htons(ETH_P_IPV6):

		return nft_reject_ipv6_eval(expr, data, pkt);

	default:

		/* No explicit way to reject this protocol, drop it. */

		data[NFT_REG_VERDICT].verdict = NF_DROP;

		break;

	}

}



static struct nft_expr_type nft_reject_bridge_type;

static const struct nft_expr_ops nft_reject_bridge_ops = {

	.type		= &nft_reject_bridge_type,

	.size		= NFT_EXPR_SIZE(sizeof(struct nft_reject)),

	.eval		= nft_reject_bridge_eval,

	.init		= nft_reject_init,

	.dump		= nft_reject_dump,

};



static struct nft_expr_type nft_reject_bridge_type __read_mostly = {

	.family		= NFPROTO_BRIDGE,

	.name		= "reject",

	.ops		= &nft_reject_bridge_ops,

	.policy		= nft_reject_policy,

	.maxattr	= NFTA_REJECT_MAX,

	.owner		= THIS_MODULE,

};



static int __init nft_reject_bridge_module_init(void)

{

	return nft_register_expr(&nft_reject_bridge_type);

}



static void __exit nft_reject_bridge_module_exit(void)

{

	nft_unregister_expr(&nft_reject_bridge_type);

}



module_init(nft_reject_bridge_module_init);

module_exit(nft_reject_bridge_module_exit);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");

MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");