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netfilter: nf_tables: add "inet" table for IPv4/IPv6

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This patch adds a new table family and a new filter chain that you can
use to attach IPv4 and IPv6 rules. This should help to simplify
rule-set maintainance in dual-stack setups.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-01-03 12:16:16 +00:00 committed by Pablo Neira Ayuso
parent 115a60b173
commit 1d49144c0a
9 changed files with 116 additions and 2 deletions
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2
include/net/netfilter/nf_tables_ipv4.h
View file

@ -20,4 +20,6 @@ nft_set_pktinfo_ipv4(struct nft_pktinfo *pkt,
pkt->xt.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
}
extern struct nft_af_info nft_af_ipv4;
#endif

2
include/net/netfilter/nf_tables_ipv6.h
View file

@ -27,4 +27,6 @@ nft_set_pktinfo_ipv6(struct nft_pktinfo *pkt,
return 0;
}
extern struct nft_af_info nft_af_ipv6;
#endif

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 *inet;
struct nft_af_info *arp;
struct nft_af_info *bridge;
u8 gencursor;

1
include/uapi/linux/netfilter.h
View file

@ -53,6 +53,7 @@ enum nf_inet_hooks {
enum {
NFPROTO_UNSPEC = 0,
NFPROTO_INET = 1,
NFPROTO_IPV4 = 2,
NFPROTO_ARP = 3,
NFPROTO_BRIDGE = 7,

3
net/ipv4/netfilter/nf_tables_ipv4.c
View file

@ -48,7 +48,7 @@ static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
return nft_do_chain_ipv4(ops, skb, in, out, okfn);
}
static struct nft_af_info nft_af_ipv4 __read_mostly = {
struct nft_af_info nft_af_ipv4 __read_mostly = {
.family = NFPROTO_IPV4,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
@ -61,6 +61,7 @@ static struct nft_af_info nft_af_ipv4 __read_mostly = {
[NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
},
};
EXPORT_SYMBOL_GPL(nft_af_ipv4);
static int nf_tables_ipv4_init_net(struct net *net)
{

3
net/ipv6/netfilter/nf_tables_ipv6.c
View file

@ -47,7 +47,7 @@ static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops,
return nft_do_chain_ipv6(ops, skb, in, out, okfn);
}
static struct nft_af_info nft_af_ipv6 __read_mostly = {
struct nft_af_info nft_af_ipv6 __read_mostly = {
.family = NFPROTO_IPV6,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
@ -60,6 +60,7 @@ static struct nft_af_info nft_af_ipv6 __read_mostly = {
[NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
},
};
EXPORT_SYMBOL_GPL(nft_af_ipv6);
static int nf_tables_ipv6_init_net(struct net *net)
{

8
net/netfilter/Kconfig
View file

@ -428,6 +428,14 @@ config NF_TABLES
To compile it as a module, choose M here.
config NF_TABLES_INET
depends on NF_TABLES
select NF_TABLES_IPV4
select NF_TABLES_IPV6
tristate "Netfilter nf_tables mixed IPv4/IPv6 tables support"
help
This option enables support for a mixed IPv4/IPv6 "inet" table.
config NFT_EXTHDR
depends on NF_TABLES
tristate "Netfilter nf_tables IPv6 exthdr module"

1
net/netfilter/Makefile
View file

@ -70,6 +70,7 @@ nf_tables-objs += nft_immediate.o nft_cmp.o nft_lookup.o
nf_tables-objs += nft_bitwise.o nft_byteorder.o nft_payload.o
obj-$(CONFIG_NF_TABLES) += nf_tables.o
obj-$(CONFIG_NF_TABLES_INET) += nf_tables_inet.o
obj-$(CONFIG_NFT_COMPAT) += nft_compat.o
obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o
obj-$(CONFIG_NFT_META) += nft_meta.o

97
net/netfilter/nf_tables_inet.c Normal file
View file

@ -0,0 +1,97 @@
/*
* Copyright (c) 2012-2014 Patrick McHardy <kaber@trash.net>
*
* 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/init.h>
#include <linux/module.h>
#include <linux/ip.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_ipv4.h>
#include <net/netfilter/nf_tables_ipv6.h>
#include <net/ip.h>
static void nft_inet_hook_ops_init(struct nf_hook_ops *ops, unsigned int n)
{
struct nft_af_info *afi;
if (n == 1)
afi = &nft_af_ipv4;
else
afi = &nft_af_ipv6;
ops->pf = afi->family;
if (afi->hooks[ops->hooknum])
ops->hook = afi->hooks[ops->hooknum];
}
static struct nft_af_info nft_af_inet __read_mostly = {
.family = NFPROTO_INET,
.nhooks = NF_INET_NUMHOOKS,
.owner = THIS_MODULE,
.nops = 2,
.hook_ops_init = nft_inet_hook_ops_init,
};
static int __net_init nf_tables_inet_init_net(struct net *net)
{
net->nft.inet = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
if (net->nft.inet == NULL)
return -ENOMEM;
memcpy(net->nft.inet, &nft_af_inet, sizeof(nft_af_inet));
if (nft_register_afinfo(net, net->nft.inet) < 0)
goto err;
return 0;
err:
kfree(net->nft.inet);
return -ENOMEM;
}
static void __net_exit nf_tables_inet_exit_net(struct net *net)
{
nft_unregister_afinfo(net->nft.inet);
kfree(net->nft.inet);
}
static struct pernet_operations nf_tables_inet_net_ops = {
.init = nf_tables_inet_init_net,
.exit = nf_tables_inet_exit_net,
};
static struct nf_chain_type filter_inet = {
.family = NFPROTO_INET,
.name = "filter",
.type = NFT_CHAIN_T_DEFAULT,
.hook_mask = (1 << NF_INET_LOCAL_IN) |
(1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_FORWARD) |
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
};
static int __init nf_tables_inet_init(void)
{
nft_register_chain_type(&filter_inet);
return register_pernet_subsys(&nf_tables_inet_net_ops);
}
static void __exit nf_tables_inet_exit(void)
{
unregister_pernet_subsys(&nf_tables_inet_net_ops);
nft_unregister_chain_type(&filter_inet);
}
module_init(nf_tables_inet_init);
module_exit(nf_tables_inet_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_ALIAS_NFT_FAMILY(1);