From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pablo Neira Ayuso Subject: [PATCH] netfilter: bridge: add reject support Date: Fri, 27 Jun 2014 13:36:11 +0200 Message-ID: <1403868971-13070-1-git-send-email-pablo@netfilter.org> Cc: kaber@trash.net To: netfilter-devel@vger.kernel.org Return-path: Received: from mail.us.es ([193.147.175.20]:60343 "EHLO mail.us.es" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753163AbaF0LgU (ORCPT ); Fri, 27 Jun 2014 07:36:20 -0400 Sender: netfilter-devel-owner@vger.kernel.org List-ID: 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 --- net/bridge/netfilter/Kconfig | 6 +++ net/bridge/netfilter/Makefile | 1 + net/bridge/netfilter/nft_reject_bridge.c | 67 ++++++++++++++++++++++++++++++ 3 files changed, 74 insertions(+) create mode 100644 net/bridge/netfilter/nft_reject_bridge.c diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig index 4ce0b31..9cebf47 100644 --- a/net/bridge/netfilter/Kconfig +++ b/net/bridge/netfilter/Kconfig @@ -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" diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile index 1f78ea0..061d121 100644 --- a/net/bridge/netfilter/Makefile +++ b/net/bridge/netfilter/Makefile @@ -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 diff --git a/net/bridge/netfilter/nft_reject_bridge.c b/net/bridge/netfilter/nft_reject_bridge.c new file mode 100644 index 0000000..ee3ffe9 --- /dev/null +++ b/net/bridge/netfilter/nft_reject_bridge.c @@ -0,0 +1,67 @@ +/* + * Copyright (c) 2014 Pablo Neira Ayuso + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +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 "); +MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject"); -- 1.7.10.4