Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-23 04:31:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

netfilter: nf_tables: add ARP filtering support

Browse Source 
This patch registers the ARP family and he filter chain type
for this family.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2013-10-07 22:53:08 +02:00
parent b5bc89bfa0
commit ed683f138b
4 changed files with 108 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/net/netns/nftables.h
View File

@ -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;

4
net/ipv4/netfilter/Kconfig
View File

@ -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

1
net/ipv4/netfilter/Makefile
View File

@ -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

102
net/ipv4/netfilter/nf_tables_arp.c Normal file
View File

@ -0,0 +1,102 @@
/*
* Copyright (c) 2008-2010 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2013 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.
*
* 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@trash.net>");
MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */