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Message-Id: <1381768738-17739-18-git-send-email-pablo@netfilter.org>
Date: Mon, 14 Oct 2013 18:38:58 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, kaber@...sh.net, netdev@...r.kernel.org
Subject: [PATCH 17/17] netfilter: nf_tables: add ARP filtering support
This patch registers the ARP family and he filter chain type
for this family.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netns/nftables.h | 1 +
net/ipv4/netfilter/Kconfig | 4 ++
net/ipv4/netfilter/Makefile | 1 +
net/ipv4/netfilter/nf_tables_arp.c | 102 ++++++++++++++++++++++++++++++++++++
4 files changed, 108 insertions(+)
create mode 100644 net/ipv4/netfilter/nf_tables_arp.c
diff --git a/include/net/netns/nftables.h b/include/net/netns/nftables.h
index 08a4248..15d056d 100644
--- a/include/net/netns/nftables.h
+++ b/include/net/netns/nftables.h
@@ -10,6 +10,7 @@ struct netns_nftables {
struct list_head commit_list;
struct nft_af_info *ipv4;
struct nft_af_info *ipv6;
+ struct nft_af_info *arp;
struct nft_af_info *bridge;
u8 gencursor;
u8 genctr;
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 1f37ef6..40d5607 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -53,6 +53,10 @@ config NFT_CHAIN_NAT_IPV4
depends on NF_NAT_IPV4 && NFT_NAT
tristate "IPv4 nf_tables nat chain support"
+config NF_TABLES_ARP
+ depends on NF_TABLES
+ tristate "ARP nf_tables support"
+
config IP_NF_IPTABLES
tristate "IP tables support (required for filtering/masq/NAT)"
default m if NETFILTER_ADVANCED=n
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index 91e0bd7..19df72b 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_NF_TABLES_IPV4) += nf_tables_ipv4.o
obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o
obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV4) += nft_chain_route_ipv4.o
obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o
+obj-$(CONFIG_NF_TABLES_ARP) += nf_tables_arp.o
# generic IP tables
obj-$(CONFIG_IP_NF_IPTABLES) += ip_tables.o
diff --git a/net/ipv4/netfilter/nf_tables_arp.c b/net/ipv4/netfilter/nf_tables_arp.c
new file mode 100644
index 0000000..3e67ef1
--- /dev/null
+++ b/net/ipv4/netfilter/nf_tables_arp.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2008-2010 Patrick McHardy <kaber@...sh.net>
+ * Copyright (c) 2013 Pablo Neira Ayuso <pablo@...filter.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.
+ *
+ * Development of this code funded by Astaro AG (http://www.astaro.com/)
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/netfilter_arp.h>
+#include <net/netfilter/nf_tables.h>
+
+static struct nft_af_info nft_af_arp __read_mostly = {
+ .family = NFPROTO_ARP,
+ .nhooks = NF_ARP_NUMHOOKS,
+ .owner = THIS_MODULE,
+};
+
+static int nf_tables_arp_init_net(struct net *net)
+{
+ net->nft.arp = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
+ if (net->nft.arp== NULL)
+ return -ENOMEM;
+
+ memcpy(net->nft.arp, &nft_af_arp, sizeof(nft_af_arp));
+
+ if (nft_register_afinfo(net, net->nft.arp) < 0)
+ goto err;
+
+ return 0;
+err:
+ kfree(net->nft.arp);
+ return -ENOMEM;
+}
+
+static void nf_tables_arp_exit_net(struct net *net)
+{
+ nft_unregister_afinfo(net->nft.arp);
+ kfree(net->nft.arp);
+}
+
+static struct pernet_operations nf_tables_arp_net_ops = {
+ .init = nf_tables_arp_init_net,
+ .exit = nf_tables_arp_exit_net,
+};
+
+static unsigned int
+nft_do_chain_arp(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct nft_pktinfo pkt;
+
+ nft_set_pktinfo(&pkt, ops, skb, in, out);
+
+ return nft_do_chain_pktinfo(&pkt, ops);
+}
+
+static struct nf_chain_type filter_arp = {
+ .family = NFPROTO_ARP,
+ .name = "filter",
+ .type = NFT_CHAIN_T_DEFAULT,
+ .hook_mask = (1 << NF_ARP_IN) |
+ (1 << NF_ARP_OUT) |
+ (1 << NF_ARP_FORWARD),
+ .fn = {
+ [NF_ARP_IN] = nft_do_chain_arp,
+ [NF_ARP_OUT] = nft_do_chain_arp,
+ [NF_ARP_FORWARD] = nft_do_chain_arp,
+ },
+};
+
+static int __init nf_tables_arp_init(void)
+{
+ int ret;
+
+ nft_register_chain_type(&filter_arp);
+ ret = register_pernet_subsys(&nf_tables_arp_net_ops);
+ if (ret < 0)
+ nft_unregister_chain_type(&filter_arp);
+
+ return ret;
+}
+
+static void __exit nf_tables_arp_exit(void)
+{
+ unregister_pernet_subsys(&nf_tables_arp_net_ops);
+ nft_unregister_chain_type(&filter_arp);
+}
+
+module_init(nf_tables_arp_init);
+module_exit(nf_tables_arp_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Patrick McHardy <kaber@...sh.net>");
+MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */
--
1.7.10.4
--
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