[linux-2.6-block.git] / net / netfilter / xt_CT.c

/*
 * Copyright (c) 2010 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.
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/skbuff.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CT.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_timeout.h>
#include <net/netfilter/nf_conntrack_zones.h>

static unsigned int xt_ct_target_v0(struct sk_buff *skb,
				    const struct xt_action_param *par)
{
	const struct xt_ct_target_info *info = par->targinfo;
	struct nf_conn *ct = info->ct;

	/* Previously seen (loopback)? Ignore. */
	if (skb->nfct != NULL)
		return XT_CONTINUE;

	atomic_inc(&ct->ct_general.use);
	skb->nfct = &ct->ct_general;
	skb->nfctinfo = IP_CT_NEW;

	return XT_CONTINUE;
}

static unsigned int xt_ct_target_v1(struct sk_buff *skb,
				    const struct xt_action_param *par)
{
	const struct xt_ct_target_info_v1 *info = par->targinfo;
	struct nf_conn *ct = info->ct;

	/* Previously seen (loopback)? Ignore. */
	if (skb->nfct != NULL)
		return XT_CONTINUE;

	atomic_inc(&ct->ct_general.use);
	skb->nfct = &ct->ct_general;
	skb->nfctinfo = IP_CT_NEW;

	return XT_CONTINUE;
}

static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
{
	if (par->family == NFPROTO_IPV4) {
		const struct ipt_entry *e = par->entryinfo;

		if (e->ip.invflags & IPT_INV_PROTO)
			return 0;
		return e->ip.proto;
	} else if (par->family == NFPROTO_IPV6) {
		const struct ip6t_entry *e = par->entryinfo;

		if (e->ipv6.invflags & IP6T_INV_PROTO)
			return 0;
		return e->ipv6.proto;
	} else
		return 0;
}

static int
xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
		 const struct xt_tgchk_param *par)
{
	struct nf_conntrack_helper *helper;
	struct nf_conn_help *help;
	u8 proto;

	proto = xt_ct_find_proto(par);
	if (!proto) {
		pr_info("You must specify a L4 protocol, and not use "
			"inversions on it.\n");
		return -ENOENT;
	}

	helper = nf_conntrack_helper_try_module_get(helper_name, par->family,
						    proto);
	if (helper == NULL) {
		pr_info("No such helper \"%s\"\n", helper_name);
		return -ENOENT;
	}

	help = nf_ct_helper_ext_add(ct, helper, GFP_KERNEL);
	if (help == NULL) {
		module_put(helper->me);
		return -ENOMEM;
	}

	help->helper = helper;
	return 0;
}

static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
{
	struct xt_ct_target_info *info = par->targinfo;
	struct nf_conntrack_tuple t;
	struct nf_conn *ct;
	int ret = -EOPNOTSUPP;

	if (info->flags & ~XT_CT_NOTRACK)
		return -EINVAL;

	if (info->flags & XT_CT_NOTRACK) {
		ct = nf_ct_untracked_get();
		atomic_inc(&ct->ct_general.use);
		goto out;
	}

#ifndef CONFIG_NF_CONNTRACK_ZONES
	if (info->zone)
		goto err1;
#endif

	ret = nf_ct_l3proto_try_module_get(par->family);
	if (ret < 0)
		goto err1;

	memset(&t, 0, sizeof(t));
	ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
	ret = PTR_ERR(ct);
	if (IS_ERR(ct))
		goto err2;

	ret = 0;
	if ((info->ct_events || info->exp_events) &&
	    !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
				  GFP_KERNEL))
		goto err3;

	if (info->helper[0]) {
		ret = xt_ct_set_helper(ct, info->helper, par);
		if (ret < 0)
			goto err3;
	}

	__set_bit(IPS_TEMPLATE_BIT, &ct->status);
	__set_bit(IPS_CONFIRMED_BIT, &ct->status);

	/* Overload tuple linked list to put us in template list. */
	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
				 &par->net->ct.tmpl);
out:
	info->ct = ct;
	return 0;

err3:
	nf_conntrack_free(ct);
err2:
	nf_ct_l3proto_module_put(par->family);
err1:
	return ret;
}

#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
{
	typeof(nf_ct_timeout_put_hook) timeout_put;

	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
	if (timeout_put)
		timeout_put(timeout);
}
#endif

static int
xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par,
		  const char *timeout_name)
{
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
	struct ctnl_timeout *timeout;
	struct nf_conn_timeout *timeout_ext;
	struct nf_conntrack_l4proto *l4proto;
	int ret = 0;
	u8 proto;

	rcu_read_lock();
	timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook);
	if (timeout_find_get == NULL) {
		ret = -ENOENT;
		pr_info("Timeout policy base is empty\n");
		goto out;
	}

	proto = xt_ct_find_proto(par);
	if (!proto) {
		ret = -EINVAL;
		pr_info("You must specify a L4 protocol, and not use "
			"inversions on it.\n");
		goto out;
	}

	timeout = timeout_find_get(timeout_name);
	if (timeout == NULL) {
		ret = -ENOENT;
		pr_info("No such timeout policy \"%s\"\n", timeout_name);
		goto out;
	}

	if (timeout->l3num != par->family) {
		ret = -EINVAL;
		pr_info("Timeout policy `%s' can only be used by L3 protocol "
			"number %d\n", timeout_name, timeout->l3num);
		goto err_put_timeout;
	}
	/* Make sure the timeout policy matches any existing protocol tracker,
	 * otherwise default to generic.
	 */
	l4proto = __nf_ct_l4proto_find(par->family, proto);
	if (timeout->l4proto->l4proto != l4proto->l4proto) {
		ret = -EINVAL;
		pr_info("Timeout policy `%s' can only be used by L4 protocol "
			"number %d\n",
			timeout_name, timeout->l4proto->l4proto);
		goto err_put_timeout;
	}
	timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC);
	if (timeout_ext == NULL)
		ret = -ENOMEM;

err_put_timeout:
	__xt_ct_tg_timeout_put(timeout);
out:
	rcu_read_unlock();
	return ret;
#else
	return -EOPNOTSUPP;
#endif
}

static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
{
	struct xt_ct_target_info_v1 *info = par->targinfo;
	struct nf_conntrack_tuple t;
	struct nf_conn *ct;
	int ret = -EOPNOTSUPP;

	if (info->flags & ~XT_CT_NOTRACK)
		return -EINVAL;

	if (info->flags & XT_CT_NOTRACK) {
		ct = nf_ct_untracked_get();
		atomic_inc(&ct->ct_general.use);
		goto out;
	}

#ifndef CONFIG_NF_CONNTRACK_ZONES
	if (info->zone)
		goto err1;
#endif

	ret = nf_ct_l3proto_try_module_get(par->family);
	if (ret < 0)
		goto err1;

	memset(&t, 0, sizeof(t));
	ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
	ret = PTR_ERR(ct);
	if (IS_ERR(ct))
		goto err2;

	ret = 0;
	if ((info->ct_events || info->exp_events) &&
	    !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
				  GFP_KERNEL))
		goto err3;

	if (info->helper[0]) {
		ret = xt_ct_set_helper(ct, info->helper, par);
		if (ret < 0)
			goto err3;
	}

	if (info->timeout[0]) {
		ret = xt_ct_set_timeout(ct, par, info->timeout);
		if (ret < 0)
			goto err3;
	}

	__set_bit(IPS_TEMPLATE_BIT, &ct->status);
	__set_bit(IPS_CONFIRMED_BIT, &ct->status);

	/* Overload tuple linked list to put us in template list. */
	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
				 &par->net->ct.tmpl);
out:
	info->ct = ct;
	return 0;

err3:
	nf_conntrack_free(ct);
err2:
	nf_ct_l3proto_module_put(par->family);
err1:
	return ret;
}

static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
{
	struct xt_ct_target_info *info = par->targinfo;
	struct nf_conn *ct = info->ct;
	struct nf_conn_help *help;

	if (!nf_ct_is_untracked(ct)) {
		help = nfct_help(ct);
		if (help)
			module_put(help->helper->me);

		nf_ct_l3proto_module_put(par->family);
	}
	nf_ct_put(info->ct);
}

static void xt_ct_destroy_timeout(struct nf_conn *ct)
{
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	struct nf_conn_timeout *timeout_ext;
	typeof(nf_ct_timeout_put_hook) timeout_put;

	rcu_read_lock();
	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);

	if (timeout_put) {
		timeout_ext = nf_ct_timeout_find(ct);
		if (timeout_ext)
			timeout_put(timeout_ext->timeout);
	}
	rcu_read_unlock();
#endif
}

static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
{
	struct xt_ct_target_info_v1 *info = par->targinfo;
	struct nf_conn *ct = info->ct;
	struct nf_conn_help *help;

	if (!nf_ct_is_untracked(ct)) {
		help = nfct_help(ct);
		if (help)
			module_put(help->helper->me);

		nf_ct_l3proto_module_put(par->family);

		xt_ct_destroy_timeout(ct);
	}
	nf_ct_put(info->ct);
}

static struct xt_target xt_ct_tg_reg[] __read_mostly = {
	{
		.name		= "CT",
		.family		= NFPROTO_UNSPEC,
		.targetsize	= sizeof(struct xt_ct_target_info),
		.checkentry	= xt_ct_tg_check_v0,
		.destroy	= xt_ct_tg_destroy_v0,
		.target		= xt_ct_target_v0,
		.table		= "raw",
		.me		= THIS_MODULE,
	},
	{
		.name		= "CT",
		.family		= NFPROTO_UNSPEC,
		.revision	= 1,
		.targetsize	= sizeof(struct xt_ct_target_info_v1),
		.checkentry	= xt_ct_tg_check_v1,
		.destroy	= xt_ct_tg_destroy_v1,
		.target		= xt_ct_target_v1,
		.table		= "raw",
		.me		= THIS_MODULE,
	},
};

static unsigned int
notrack_tg(struct sk_buff *skb, const struct xt_action_param *par)
{
	/* Previously seen (loopback)? Ignore. */
	if (skb->nfct != NULL)
		return XT_CONTINUE;

	skb->nfct = &nf_ct_untracked_get()->ct_general;
	skb->nfctinfo = IP_CT_NEW;
	nf_conntrack_get(skb->nfct);

	return XT_CONTINUE;
}

static int notrack_chk(const struct xt_tgchk_param *par)
{
	if (!par->net->xt.notrack_deprecated_warning) {
		pr_info("netfilter: NOTRACK target is deprecated, "
			"use CT instead or upgrade iptables\n");
		par->net->xt.notrack_deprecated_warning = true;
	}
	return 0;
}

static struct xt_target notrack_tg_reg __read_mostly = {
	.name		= "NOTRACK",
	.revision	= 0,
	.family		= NFPROTO_UNSPEC,
	.checkentry	= notrack_chk,
	.target		= notrack_tg,
	.table		= "raw",
	.me		= THIS_MODULE,
};

static int __init xt_ct_tg_init(void)
{
	int ret;

	ret = xt_register_target(&notrack_tg_reg);
	if (ret < 0)
		return ret;

	ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
	if (ret < 0) {
		xt_unregister_target(&notrack_tg_reg);
		return ret;
	}
	return 0;
}

static void __exit xt_ct_tg_exit(void)
{
	xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
	xt_unregister_target(&notrack_tg_reg);
}

module_init(xt_ct_tg_init);
module_exit(xt_ct_tg_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Xtables: connection tracking target");
MODULE_ALIAS("ipt_CT");
MODULE_ALIAS("ip6t_CT");
MODULE_ALIAS("ipt_NOTRACK");
MODULE_ALIAS("ip6t_NOTRACK");
Commit	Line	Data
84f3bb9a PM	1	/*
	2	* Copyright (c) 2010 Patrick McHardy <kaber@trash.net>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
a7fed762	8	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
84f3bb9a	9	#include <linux/module.h>
5a0e3ad6	10	#include <linux/gfp.h>
84f3bb9a	11	#include <linux/skbuff.h>
84f3bb9a PM	12	#include <linux/netfilter_ipv4/ip_tables.h>
	13	#include <linux/netfilter_ipv6/ip6_tables.h>
	14	#include <linux/netfilter/x_tables.h>
	15	#include <linux/netfilter/xt_CT.h>
	16	#include <net/netfilter/nf_conntrack.h>
eeb4cb95	17	#include <net/netfilter/nf_conntrack_l4proto.h>
84f3bb9a PM	18	#include <net/netfilter/nf_conntrack_helper.h>
84f3bb9a PM	19	#include <net/netfilter/nf_conntrack_ecache.h>
24de58f4	20	#include <net/netfilter/nf_conntrack_timeout.h>
5d0aa2cc	21	#include <net/netfilter/nf_conntrack_zones.h>
84f3bb9a	22
24de58f4 PNA	23	static unsigned int xt_ct_target_v0(struct sk_buff *skb,
24de58f4 PNA	24	const struct xt_action_param *par)
84f3bb9a PM	25	{
	26	const struct xt_ct_target_info *info = par->targinfo;
	27	struct nf_conn *ct = info->ct;
	28
	29	/* Previously seen (loopback)? Ignore. */
	30	if (skb->nfct != NULL)
	31	return XT_CONTINUE;
	32
	33	atomic_inc(&ct->ct_general.use);
	34	skb->nfct = &ct->ct_general;
	35	skb->nfctinfo = IP_CT_NEW;
	36
	37	return XT_CONTINUE;
	38	}
	39
24de58f4 PNA	40	static unsigned int xt_ct_target_v1(struct sk_buff *skb,
	41	const struct xt_action_param *par)
	42	{
	43	const struct xt_ct_target_info_v1 *info = par->targinfo;
	44	struct nf_conn *ct = info->ct;
	45
	46	/* Previously seen (loopback)? Ignore. */
	47	if (skb->nfct != NULL)
	48	return XT_CONTINUE;
	49
	50	atomic_inc(&ct->ct_general.use);
	51	skb->nfct = &ct->ct_general;
	52	skb->nfctinfo = IP_CT_NEW;
	53
	54	return XT_CONTINUE;
	55	}
	56
84f3bb9a PM	57	static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
84f3bb9a PM	58	{
076f7839	59	if (par->family == NFPROTO_IPV4) {
84f3bb9a PM	60	const struct ipt_entry *e = par->entryinfo;
	61
	62	if (e->ip.invflags & IPT_INV_PROTO)
	63	return 0;
	64	return e->ip.proto;
076f7839	65	} else if (par->family == NFPROTO_IPV6) {
84f3bb9a PM	66	const struct ip6t_entry *e = par->entryinfo;
	67
	68	if (e->ipv6.invflags & IP6T_INV_PROTO)
	69	return 0;
	70	return e->ipv6.proto;
	71	} else
	72	return 0;
	73	}
	74
236df005 PNA	75	static int
	76	xt_ct_set_helper(struct nf_conn ct, const char helper_name,
	77	const struct xt_tgchk_param *par)
	78	{
	79	struct nf_conntrack_helper *helper;
	80	struct nf_conn_help *help;
	81	u8 proto;
	82
	83	proto = xt_ct_find_proto(par);
	84	if (!proto) {
	85	pr_info("You must specify a L4 protocol, and not use "
	86	"inversions on it.\n");
	87	return -ENOENT;
	88	}
	89
	90	helper = nf_conntrack_helper_try_module_get(helper_name, par->family,
	91	proto);
	92	if (helper == NULL) {
	93	pr_info("No such helper \"%s\"\n", helper_name);
	94	return -ENOENT;
	95	}
	96
	97	help = nf_ct_helper_ext_add(ct, helper, GFP_KERNEL);
	98	if (help == NULL) {
	99	module_put(helper->me);
	100	return -ENOMEM;
	101	}
	102
	103	help->helper = helper;
	104	return 0;
	105	}
	106
24de58f4	107	static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
84f3bb9a PM	108	{
	109	struct xt_ct_target_info *info = par->targinfo;
	110	struct nf_conntrack_tuple t;
84f3bb9a	111	struct nf_conn *ct;
4610476d	112	int ret = -EOPNOTSUPP;
84f3bb9a	113
9bf04646 PNA	114	if (info->flags & ~XT_CT_NOTRACK)
9bf04646 PNA	115	return -EINVAL;
84f3bb9a PM	116
84f3bb9a PM	117	if (info->flags & XT_CT_NOTRACK) {
5bfddbd4	118	ct = nf_ct_untracked_get();
84f3bb9a PM	119	atomic_inc(&ct->ct_general.use);
	120	goto out;
	121	}
	122
5d0aa2cc PM	123	#ifndef CONFIG_NF_CONNTRACK_ZONES
	124	if (info->zone)
	125	goto err1;
	126	#endif
	127
4a5a5c73 JE	128	ret = nf_ct_l3proto_try_module_get(par->family);
4a5a5c73 JE	129	if (ret < 0)
84f3bb9a PM	130	goto err1;
	131
	132	memset(&t, 0, sizeof(t));
5d0aa2cc	133	ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
4a5a5c73	134	ret = PTR_ERR(ct);
84f3bb9a PM	135	if (IS_ERR(ct))
	136	goto err2;
	137
4a5a5c73	138	ret = 0;
84f3bb9a PM	139	if ((info->ct_events \|\| info->exp_events) &&
	140	!nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
	141	GFP_KERNEL))
	142	goto err3;
	143
9bf04646	144	if (info->helper[0]) {
236df005 PNA	145	ret = xt_ct_set_helper(ct, info->helper, par);
236df005 PNA	146	if (ret < 0)
1afc5679	147	goto err3;
84f3bb9a PM	148	}
	149
	150	__set_bit(IPS_TEMPLATE_BIT, &ct->status);
	151	__set_bit(IPS_CONFIRMED_BIT, &ct->status);
252b3e8c PNA	152
	153	/* Overload tuple linked list to put us in template list. */
	154	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
	155	&par->net->ct.tmpl);
84f3bb9a PM	156	out:
84f3bb9a PM	157	info->ct = ct;
d6b00a53	158	return 0;
84f3bb9a PM	159
	160	err3:
	161	nf_conntrack_free(ct);
	162	err2:
	163	nf_ct_l3proto_module_put(par->family);
	164	err1:
4a5a5c73	165	return ret;
84f3bb9a PM	166	}
84f3bb9a PM	167
ee14186f PNA	168	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	169	static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
	170	{
	171	typeof(nf_ct_timeout_put_hook) timeout_put;
	172
	173	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
	174	if (timeout_put)
	175	timeout_put(timeout);
	176	}
	177	#endif
	178
236df005 PNA	179	static int
	180	xt_ct_set_timeout(struct nf_conn ct, const struct xt_tgchk_param par,
	181	const char *timeout_name)
	182	{
	183	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	184	typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
	185	struct ctnl_timeout *timeout;
	186	struct nf_conn_timeout *timeout_ext;
236df005 PNA	187	struct nf_conntrack_l4proto *l4proto;
236df005 PNA	188	int ret = 0;
0153d5a8	189	u8 proto;
236df005 PNA	190
	191	rcu_read_lock();
	192	timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook);
	193	if (timeout_find_get == NULL) {
	194	ret = -ENOENT;
	195	pr_info("Timeout policy base is empty\n");
	196	goto out;
	197	}
	198
0153d5a8 PNA	199	proto = xt_ct_find_proto(par);
0153d5a8 PNA	200	if (!proto) {
236df005	201	ret = -EINVAL;
0153d5a8 PNA	202	pr_info("You must specify a L4 protocol, and not use "
0153d5a8 PNA	203	"inversions on it.\n");
236df005 PNA	204	goto out;
	205	}
	206
	207	timeout = timeout_find_get(timeout_name);
	208	if (timeout == NULL) {
	209	ret = -ENOENT;
	210	pr_info("No such timeout policy \"%s\"\n", timeout_name);
	211	goto out;
	212	}
	213
	214	if (timeout->l3num != par->family) {
	215	ret = -EINVAL;
	216	pr_info("Timeout policy `%s' can only be used by L3 protocol "
	217	"number %d\n", timeout_name, timeout->l3num);
	218	goto err_put_timeout;
	219	}
	220	/* Make sure the timeout policy matches any existing protocol tracker,
	221	* otherwise default to generic.
	222	*/
0153d5a8	223	l4proto = __nf_ct_l4proto_find(par->family, proto);
236df005 PNA	224	if (timeout->l4proto->l4proto != l4proto->l4proto) {
	225	ret = -EINVAL;
	226	pr_info("Timeout policy `%s' can only be used by L4 protocol "
	227	"number %d\n",
	228	timeout_name, timeout->l4proto->l4proto);
	229	goto err_put_timeout;
	230	}
	231	timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC);
	232	if (timeout_ext == NULL)
	233	ret = -ENOMEM;
	234
	235	err_put_timeout:
	236	__xt_ct_tg_timeout_put(timeout);
	237	out:
	238	rcu_read_unlock();
	239	return ret;
	240	#else
	241	return -EOPNOTSUPP;
	242	#endif
	243	}
	244
24de58f4 PNA	245	static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
	246	{
	247	struct xt_ct_target_info_v1 *info = par->targinfo;
	248	struct nf_conntrack_tuple t;
24de58f4	249	struct nf_conn *ct;
4610476d	250	int ret = -EOPNOTSUPP;
236df005	251
24de58f4 PNA	252	if (info->flags & ~XT_CT_NOTRACK)
	253	return -EINVAL;
	254
	255	if (info->flags & XT_CT_NOTRACK) {
	256	ct = nf_ct_untracked_get();
	257	atomic_inc(&ct->ct_general.use);
	258	goto out;
	259	}
	260
	261	#ifndef CONFIG_NF_CONNTRACK_ZONES
	262	if (info->zone)
	263	goto err1;
	264	#endif
	265
	266	ret = nf_ct_l3proto_try_module_get(par->family);
	267	if (ret < 0)
	268	goto err1;
	269
	270	memset(&t, 0, sizeof(t));
	271	ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
	272	ret = PTR_ERR(ct);
	273	if (IS_ERR(ct))
	274	goto err2;
	275
	276	ret = 0;
	277	if ((info->ct_events \|\| info->exp_events) &&
	278	!nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
	279	GFP_KERNEL))
	280	goto err3;
	281
	282	if (info->helper[0]) {
236df005 PNA	283	ret = xt_ct_set_helper(ct, info->helper, par);
236df005 PNA	284	if (ret < 0)
1afc5679	285	goto err3;
24de58f4 PNA	286	}
24de58f4 PNA	287
6cf51852	288	if (info->timeout[0]) {
236df005 PNA	289	ret = xt_ct_set_timeout(ct, par, info->timeout);
	290	if (ret < 0)
	291	goto err3;
24de58f4	292	}
24de58f4 PNA	293
	294	__set_bit(IPS_TEMPLATE_BIT, &ct->status);
	295	__set_bit(IPS_CONFIRMED_BIT, &ct->status);
252b3e8c PNA	296
	297	/* Overload tuple linked list to put us in template list. */
	298	hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
	299	&par->net->ct.tmpl);
24de58f4 PNA	300	out:
	301	info->ct = ct;
	302	return 0;
	303
	304	err3:
	305	nf_conntrack_free(ct);
	306	err2:
	307	nf_ct_l3proto_module_put(par->family);
	308	err1:
	309	return ret;
	310	}
	311
	312	static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
84f3bb9a PM	313	{
	314	struct xt_ct_target_info *info = par->targinfo;
	315	struct nf_conn *ct = info->ct;
	316	struct nf_conn_help *help;
	317
5bfddbd4	318	if (!nf_ct_is_untracked(ct)) {
84f3bb9a PM	319	help = nfct_help(ct);
	320	if (help)
	321	module_put(help->helper->me);
	322
	323	nf_ct_l3proto_module_put(par->family);
	324	}
	325	nf_ct_put(info->ct);
	326	}
	327
236df005	328	static void xt_ct_destroy_timeout(struct nf_conn *ct)
24de58f4	329	{
24de58f4 PNA	330	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	331	struct nf_conn_timeout *timeout_ext;
	332	typeof(nf_ct_timeout_put_hook) timeout_put;
236df005 PNA	333
	334	rcu_read_lock();
	335	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
	336
	337	if (timeout_put) {
	338	timeout_ext = nf_ct_timeout_find(ct);
	339	if (timeout_ext)
	340	timeout_put(timeout_ext->timeout);
	341	}
	342	rcu_read_unlock();
24de58f4	343	#endif
236df005 PNA	344	}
	345
	346	static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
	347	{
	348	struct xt_ct_target_info_v1 *info = par->targinfo;
	349	struct nf_conn *ct = info->ct;
	350	struct nf_conn_help *help;
	351
24de58f4 PNA	352	if (!nf_ct_is_untracked(ct)) {
	353	help = nfct_help(ct);
	354	if (help)
	355	module_put(help->helper->me);
	356
	357	nf_ct_l3proto_module_put(par->family);
	358
236df005	359	xt_ct_destroy_timeout(ct);
24de58f4 PNA	360	}
	361	nf_ct_put(info->ct);
	362	}
	363
	364	static struct xt_target xt_ct_tg_reg[] __read_mostly = {
	365	{
	366	.name = "CT",
	367	.family = NFPROTO_UNSPEC,
	368	.targetsize = sizeof(struct xt_ct_target_info),
	369	.checkentry = xt_ct_tg_check_v0,
	370	.destroy = xt_ct_tg_destroy_v0,
	371	.target = xt_ct_target_v0,
	372	.table = "raw",
	373	.me = THIS_MODULE,
	374	},
	375	{
	376	.name = "CT",
	377	.family = NFPROTO_UNSPEC,
	378	.revision = 1,
	379	.targetsize = sizeof(struct xt_ct_target_info_v1),
	380	.checkentry = xt_ct_tg_check_v1,
	381	.destroy = xt_ct_tg_destroy_v1,
	382	.target = xt_ct_target_v1,
	383	.table = "raw",
	384	.me = THIS_MODULE,
	385	},
84f3bb9a PM	386	};
84f3bb9a PM	387
10db9069 PNA	388	static unsigned int
	389	notrack_tg(struct sk_buff skb, const struct xt_action_param par)
	390	{
	391	/* Previously seen (loopback)? Ignore. */
	392	if (skb->nfct != NULL)
	393	return XT_CONTINUE;
	394
	395	skb->nfct = &nf_ct_untracked_get()->ct_general;
	396	skb->nfctinfo = IP_CT_NEW;
	397	nf_conntrack_get(skb->nfct);
	398
	399	return XT_CONTINUE;
	400	}
	401
	402	static int notrack_chk(const struct xt_tgchk_param *par)
	403	{
	404	if (!par->net->xt.notrack_deprecated_warning) {
	405	pr_info("netfilter: NOTRACK target is deprecated, "
	406	"use CT instead or upgrade iptables\n");
	407	par->net->xt.notrack_deprecated_warning = true;
	408	}
	409	return 0;
	410	}
	411
	412	static struct xt_target notrack_tg_reg __read_mostly = {
	413	.name = "NOTRACK",
	414	.revision = 0,
	415	.family = NFPROTO_UNSPEC,
	416	.checkentry = notrack_chk,
	417	.target = notrack_tg,
	418	.table = "raw",
	419	.me = THIS_MODULE,
	420	};
	421
84f3bb9a PM	422	static int __init xt_ct_tg_init(void)
84f3bb9a PM	423	{
10db9069 PNA	424	int ret;
	425
	426	ret = xt_register_target(&notrack_tg_reg);
	427	if (ret < 0)
	428	return ret;
	429
	430	ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
	431	if (ret < 0) {
	432	xt_unregister_target(&notrack_tg_reg);
	433	return ret;
	434	}
	435	return 0;
84f3bb9a PM	436	}
	437
	438	static void __exit xt_ct_tg_exit(void)
	439	{
24de58f4	440	xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
10db9069	441	xt_unregister_target(&notrack_tg_reg);
84f3bb9a PM	442	}
	443
	444	module_init(xt_ct_tg_init);
	445	module_exit(xt_ct_tg_exit);
	446
	447	MODULE_LICENSE("GPL");
	448	MODULE_DESCRIPTION("Xtables: connection tracking target");
	449	MODULE_ALIAS("ipt_CT");
	450	MODULE_ALIAS("ip6t_CT");
10db9069 PNA	451	MODULE_ALIAS("ipt_NOTRACK");
10db9069 PNA	452	MODULE_ALIAS("ip6t_NOTRACK");