2005-04-16 22:20:36 +00:00
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/* Kernel module to match connection tracking information. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
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* (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
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2005-04-16 22:20:36 +00:00
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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/module.h>
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#include <linux/skbuff.h>
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2007-03-14 23:37:25 +00:00
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#include <net/netfilter/nf_conntrack.h>
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[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter/xt_state.h>
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2005-04-16 22:20:36 +00:00
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
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[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
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MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module");
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MODULE_ALIAS("ipt_state");
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MODULE_ALIAS("ip6t_state");
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2005-04-16 22:20:36 +00:00
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2007-07-08 05:15:35 +00:00
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static bool
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2009-07-07 18:42:08 +00:00
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state_mt(const struct sk_buff *skb, struct xt_action_param *par)
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2005-04-16 22:20:36 +00:00
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{
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2008-10-08 09:35:18 +00:00
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const struct xt_state_info *sinfo = par->matchinfo;
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2005-04-16 22:20:36 +00:00
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enum ip_conntrack_info ctinfo;
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unsigned int statebit;
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2010-06-08 14:09:52 +00:00
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struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
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2005-04-16 22:20:36 +00:00
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2010-06-08 14:09:52 +00:00
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if (!ct)
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[NETFILTER] x_tables: Abstraction layer for {ip,ip6,arp}_tables
This monster-patch tries to do the best job for unifying the data
structures and backend interfaces for the three evil clones ip_tables,
ip6_tables and arp_tables. In an ideal world we would never have
allowed this kind of copy+paste programming... but well, our world
isn't (yet?) ideal.
o introduce a new x_tables module
o {ip,arp,ip6}_tables depend on this x_tables module
o registration functions for tables, matches and targets are only
wrappers around x_tables provided functions
o all matches/targets that are used from ip_tables and ip6_tables
are now implemented as xt_FOOBAR.c files and provide module aliases
to ipt_FOOBAR and ip6t_FOOBAR
o header files for xt_matches are in include/linux/netfilter/,
include/linux/netfilter_{ipv4,ipv6} contains compatibility wrappers
around the xt_FOOBAR.h headers
Based on this patchset we're going to further unify the code,
gradually getting rid of all the layer 3 specific assumptions.
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-01-12 21:30:04 +00:00
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statebit = XT_STATE_INVALID;
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2010-06-08 14:09:52 +00:00
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else {
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if (nf_ct_is_untracked(ct))
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statebit = XT_STATE_UNTRACKED;
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else
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statebit = XT_STATE_BIT(ctinfo);
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}
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2005-04-16 22:20:36 +00:00
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return (sinfo->statemask & statebit);
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}
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2010-03-19 16:16:42 +00:00
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static int state_mt_check(const struct xt_mtchk_param *par)
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2006-03-22 21:56:08 +00:00
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{
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2010-03-19 16:32:59 +00:00
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int ret;
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ret = nf_ct_l3proto_try_module_get(par->family);
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2010-03-21 03:05:56 +00:00
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if (ret < 0)
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2010-03-17 15:04:40 +00:00
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pr_info("cannot load conntrack support for proto=%u\n",
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par->family);
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2010-03-21 03:05:56 +00:00
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return ret;
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2006-03-22 21:56:08 +00:00
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}
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2008-10-08 09:35:19 +00:00
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static void state_mt_destroy(const struct xt_mtdtor_param *par)
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2006-03-22 21:56:08 +00:00
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{
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2010-03-17 23:44:52 +00:00
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nf_ct_l3proto_module_put(par->family);
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2006-03-22 21:56:08 +00:00
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}
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2010-03-24 21:50:01 +00:00
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static struct xt_match state_mt_reg __read_mostly = {
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.name = "state",
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.family = NFPROTO_UNSPEC,
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.checkentry = state_mt_check,
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.match = state_mt,
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.destroy = state_mt_destroy,
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.matchsize = sizeof(struct xt_state_info),
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.me = THIS_MODULE,
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2005-04-16 22:20:36 +00:00
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};
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2007-12-05 07:24:03 +00:00
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static int __init state_mt_init(void)
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2005-04-16 22:20:36 +00:00
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{
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2010-03-24 21:50:01 +00:00
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return xt_register_match(&state_mt_reg);
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2005-04-16 22:20:36 +00:00
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}
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2007-12-05 07:24:03 +00:00
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static void __exit state_mt_exit(void)
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2005-04-16 22:20:36 +00:00
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{
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2010-03-24 21:50:01 +00:00
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xt_unregister_match(&state_mt_reg);
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2005-04-16 22:20:36 +00:00
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}
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2007-12-05 07:24:03 +00:00
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module_init(state_mt_init);
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module_exit(state_mt_exit);
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