tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Pablo Neira Ayuso <pablo@netfilter.org>
+74
+6
net/bridge/netfilter/Kconfig
+6
net/bridge/netfilter/Kconfig
···
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help
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Add support for bridge dedicated meta key.
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config NFT_BRIDGE_REJECT
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tristate "Netfilter nf_tables bridge reject support"
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depends on NFT_REJECT && NFT_REJECT_IPV4 && NFT_REJECT_IPV6
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help
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Add support to reject packets.
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config NF_LOG_BRIDGE
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tristate "Bridge packet logging"
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+1
net/bridge/netfilter/Makefile
+1
net/bridge/netfilter/Makefile
+67
net/bridge/netfilter/nft_reject_bridge.c
+67
net/bridge/netfilter/nft_reject_bridge.c
···
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/*
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* Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_tables.h>
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#include <net/netfilter/nft_reject.h>
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static void nft_reject_bridge_eval(const struct nft_expr *expr,
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struct nft_data data[NFT_REG_MAX + 1],
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const struct nft_pktinfo *pkt)
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{
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switch (eth_hdr(pkt->skb)->h_proto) {
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case htons(ETH_P_IP):
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return nft_reject_ipv4_eval(expr, data, pkt);
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case htons(ETH_P_IPV6):
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return nft_reject_ipv6_eval(expr, data, pkt);
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default:
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/* No explicit way to reject this protocol, drop it. */
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data[NFT_REG_VERDICT].verdict = NF_DROP;
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break;
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}
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}
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static struct nft_expr_type nft_reject_bridge_type;
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static const struct nft_expr_ops nft_reject_bridge_ops = {
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.type = &nft_reject_bridge_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
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.eval = nft_reject_bridge_eval,
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.init = nft_reject_init,
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.dump = nft_reject_dump,
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};
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static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
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.family = NFPROTO_BRIDGE,
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.name = "reject",
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.ops = &nft_reject_bridge_ops,
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.policy = nft_reject_policy,
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.maxattr = NFTA_REJECT_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_reject_bridge_module_init(void)
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{
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return nft_register_expr(&nft_reject_bridge_type);
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}
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static void __exit nft_reject_bridge_module_exit(void)
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{
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nft_unregister_expr(&nft_reject_bridge_type);
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}
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module_init(nft_reject_bridge_module_init);
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module_exit(nft_reject_bridge_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
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MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");