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netfilter: bridge: add reject support

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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: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2014-06-27 13:36:11 +02:00
parent 8fd90bb889
commit 85f5b3086a
3 changed files with 74 additions and 0 deletions
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6
net/bridge/netfilter/Kconfig
View file

@ -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"

1
net/bridge/netfilter/Makefile
View file

@ -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

67
net/bridge/netfilter/nft_reject_bridge.c Normal file
View file

@ -0,0 +1,67 @@
/*
* 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");