[mirror_ubuntu-bionic-kernel.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 inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct)
{
	/* Previously seen (loopback)? Ignore. */
	if (skb->_nfct != 0)
		return XT_CONTINUE;

	/* special case the untracked ct : we want the percpu object */
	if (!ct)
		ct = nf_ct_untracked_get();
	atomic_inc(&ct->ct_general.use);
	nf_ct_set(skb, ct, IP_CT_NEW);

	return XT_CONTINUE;
}

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;

	return xt_ct_target(skb, ct);
}

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;

	return xt_ct_target(skb, ct);
}

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;
}

#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(par->net, 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;

	rcu_read_unlock();
	return ret;

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

static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info)
{
	switch (info->flags & (XT_CT_ZONE_DIR_ORIG |
			       XT_CT_ZONE_DIR_REPL)) {
	case XT_CT_ZONE_DIR_ORIG:
		return NF_CT_ZONE_DIR_ORIG;
	case XT_CT_ZONE_DIR_REPL:
		return NF_CT_ZONE_DIR_REPL;
	default:
		return NF_CT_DEFAULT_ZONE_DIR;
	}
}

static int xt_ct_tg_check(const struct xt_tgchk_param *par,
			  struct xt_ct_target_info_v1 *info)
{
	struct nf_conntrack_zone zone;
	struct nf_conn *ct;
	int ret = -EOPNOTSUPP;

	if (info->flags & XT_CT_NOTRACK) {
		ct = NULL;
		goto out;
	}

#ifndef CONFIG_NF_CONNTRACK_ZONES
	if (info->zone || info->flags & (XT_CT_ZONE_DIR_ORIG |
					 XT_CT_ZONE_DIR_REPL |
					 XT_CT_ZONE_MARK))
		goto err1;
#endif

	ret = nf_ct_netns_get(par->net, par->family);
	if (ret < 0)
		goto err1;

	memset(&zone, 0, sizeof(zone));
	zone.id = info->zone;
	zone.dir = xt_ct_flags_to_dir(info);
	if (info->flags & XT_CT_ZONE_MARK)
		zone.flags |= NF_CT_FLAG_MARK;

	ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL);
	if (!ct) {
		ret = -ENOMEM;
		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)) {
		ret = -EINVAL;
		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_CONFIRMED_BIT, &ct->status);
	nf_conntrack_get(&ct->ct_general);
out:
	info->ct = ct;
	return 0;

err3:
	nf_ct_tmpl_free(ct);
err2:
	nf_ct_netns_put(par->net, par->family);
err1:
	return ret;
}

static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
{
	struct xt_ct_target_info *info = par->targinfo;
	struct xt_ct_target_info_v1 info_v1 = {
		.flags 		= info->flags,
		.zone		= info->zone,
		.ct_events	= info->ct_events,
		.exp_events	= info->exp_events,
	};
	int ret;

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

	memcpy(info_v1.helper, info->helper, sizeof(info->helper));

	ret = xt_ct_tg_check(par, &info_v1);
	if (ret < 0)
		return ret;

	info->ct = info_v1.ct;

	return ret;
}

static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
{
	struct xt_ct_target_info_v1 *info = par->targinfo;

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

	return xt_ct_tg_check(par, par->targinfo);
}

static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
{
	struct xt_ct_target_info_v1 *info = par->targinfo;

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

	return xt_ct_tg_check(par, par->targinfo);
}

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_INIT_POINTER(timeout_ext->timeout, NULL);
		}
	}
	rcu_read_unlock();
#endif
}

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

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

		nf_ct_netns_put(par->net, par->family);

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

static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
{
	struct xt_ct_target_info *info = par->targinfo;
	struct xt_ct_target_info_v1 info_v1 = {
		.flags 		= info->flags,
		.zone		= info->zone,
		.ct_events	= info->ct_events,
		.exp_events	= info->exp_events,
		.ct		= info->ct,
	};
	memcpy(info_v1.helper, info->helper, sizeof(info->helper));

	xt_ct_tg_destroy(par, &info_v1);
}

static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
{
	xt_ct_tg_destroy(par, par->targinfo);
}

static struct xt_target xt_ct_tg_reg[] __read_mostly = {
	{
		.name		= "CT",
		.family		= NFPROTO_UNSPEC,
		.targetsize	= sizeof(struct xt_ct_target_info),
		.usersize	= offsetof(struct xt_ct_target_info, ct),
		.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),
		.usersize	= offsetof(struct xt_ct_target_info, ct),
		.checkentry	= xt_ct_tg_check_v1,
		.destroy	= xt_ct_tg_destroy_v1,
		.target		= xt_ct_target_v1,
		.table		= "raw",
		.me		= THIS_MODULE,
	},
	{
		.name		= "CT",
		.family		= NFPROTO_UNSPEC,
		.revision	= 2,
		.targetsize	= sizeof(struct xt_ct_target_info_v1),
		.usersize	= offsetof(struct xt_ct_target_info, ct),
		.checkentry	= xt_ct_tg_check_v2,
		.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 != 0)
		return XT_CONTINUE;

	nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
	nf_conntrack_get(skb_nfct(skb));

	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
d52ed437	23	static inline int xt_ct_target(struct sk_buff skb, struct nf_conn ct)
84f3bb9a	24	{
84f3bb9a	25	/* Previously seen (loopback)? Ignore. */
a9e419dc	26	if (skb->_nfct != 0)
84f3bb9a PM	27	return XT_CONTINUE;
84f3bb9a PM	28
27e7190e ED	29	/* special case the untracked ct : we want the percpu object */
	30	if (!ct)
	31	ct = nf_ct_untracked_get();
84f3bb9a	32	atomic_inc(&ct->ct_general.use);
c74454fa	33	nf_ct_set(skb, ct, IP_CT_NEW);
84f3bb9a PM	34
	35	return XT_CONTINUE;
	36	}
	37
d52ed437	38	static unsigned int xt_ct_target_v0(struct sk_buff *skb,
24de58f4 PNA	39	const struct xt_action_param *par)
24de58f4 PNA	40	{
d52ed437	41	const struct xt_ct_target_info *info = par->targinfo;
24de58f4 PNA	42	struct nf_conn *ct = info->ct;
24de58f4 PNA	43
d52ed437 PNA	44	return xt_ct_target(skb, ct);
d52ed437 PNA	45	}
24de58f4	46
d52ed437 PNA	47	static unsigned int xt_ct_target_v1(struct sk_buff *skb,
	48	const struct xt_action_param *par)
	49	{
	50	const struct xt_ct_target_info_v1 *info = par->targinfo;
	51	struct nf_conn *ct = info->ct;
24de58f4	52
d52ed437	53	return xt_ct_target(skb, ct);
24de58f4 PNA	54	}
24de58f4 PNA	55
84f3bb9a PM	56	static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
84f3bb9a PM	57	{
076f7839	58	if (par->family == NFPROTO_IPV4) {
84f3bb9a PM	59	const struct ipt_entry *e = par->entryinfo;
	60
	61	if (e->ip.invflags & IPT_INV_PROTO)
	62	return 0;
	63	return e->ip.proto;
076f7839	64	} else if (par->family == NFPROTO_IPV6) {
84f3bb9a PM	65	const struct ip6t_entry *e = par->entryinfo;
	66
	67	if (e->ipv6.invflags & IP6T_INV_PROTO)
	68	return 0;
	69	return e->ipv6.proto;
	70	} else
	71	return 0;
	72	}
	73
236df005 PNA	74	static int
	75	xt_ct_set_helper(struct nf_conn ct, const char helper_name,
	76	const struct xt_tgchk_param *par)
	77	{
	78	struct nf_conntrack_helper *helper;
	79	struct nf_conn_help *help;
	80	u8 proto;
	81
	82	proto = xt_ct_find_proto(par);
	83	if (!proto) {
	84	pr_info("You must specify a L4 protocol, and not use "
	85	"inversions on it.\n");
	86	return -ENOENT;
	87	}
	88
	89	helper = nf_conntrack_helper_try_module_get(helper_name, par->family,
	90	proto);
	91	if (helper == NULL) {
	92	pr_info("No such helper \"%s\"\n", helper_name);
	93	return -ENOENT;
	94	}
	95
	96	help = nf_ct_helper_ext_add(ct, helper, GFP_KERNEL);
	97	if (help == NULL) {
	98	module_put(helper->me);
	99	return -ENOMEM;
	100	}
	101
	102	help->helper = helper;
	103	return 0;
	104	}
	105
ee14186f PNA	106	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	107	static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
	108	{
	109	typeof(nf_ct_timeout_put_hook) timeout_put;
	110
	111	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
	112	if (timeout_put)
	113	timeout_put(timeout);
	114	}
	115	#endif
	116
236df005 PNA	117	static int
	118	xt_ct_set_timeout(struct nf_conn ct, const struct xt_tgchk_param par,
	119	const char *timeout_name)
	120	{
	121	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	122	typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
	123	struct ctnl_timeout *timeout;
	124	struct nf_conn_timeout *timeout_ext;
236df005 PNA	125	struct nf_conntrack_l4proto *l4proto;
236df005 PNA	126	int ret = 0;
0153d5a8	127	u8 proto;
236df005 PNA	128
	129	rcu_read_lock();
	130	timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook);
	131	if (timeout_find_get == NULL) {
	132	ret = -ENOENT;
	133	pr_info("Timeout policy base is empty\n");
	134	goto out;
	135	}
	136
0153d5a8 PNA	137	proto = xt_ct_find_proto(par);
0153d5a8 PNA	138	if (!proto) {
236df005	139	ret = -EINVAL;
0153d5a8 PNA	140	pr_info("You must specify a L4 protocol, and not use "
0153d5a8 PNA	141	"inversions on it.\n");
236df005 PNA	142	goto out;
	143	}
	144
19576c94	145	timeout = timeout_find_get(par->net, timeout_name);
236df005 PNA	146	if (timeout == NULL) {
	147	ret = -ENOENT;
	148	pr_info("No such timeout policy \"%s\"\n", timeout_name);
	149	goto out;
	150	}
	151
	152	if (timeout->l3num != par->family) {
	153	ret = -EINVAL;
	154	pr_info("Timeout policy `%s' can only be used by L3 protocol "
	155	"number %d\n", timeout_name, timeout->l3num);
	156	goto err_put_timeout;
	157	}
	158	/* Make sure the timeout policy matches any existing protocol tracker,
	159	* otherwise default to generic.
	160	*/
0153d5a8	161	l4proto = __nf_ct_l4proto_find(par->family, proto);
236df005 PNA	162	if (timeout->l4proto->l4proto != l4proto->l4proto) {
	163	ret = -EINVAL;
	164	pr_info("Timeout policy `%s' can only be used by L4 protocol "
	165	"number %d\n",
	166	timeout_name, timeout->l4proto->l4proto);
	167	goto err_put_timeout;
	168	}
	169	timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC);
	170	if (timeout_ext == NULL)
	171	ret = -ENOMEM;
	172
403d89ad PNA	173	rcu_read_unlock();
	174	return ret;
	175
236df005 PNA	176	err_put_timeout:
	177	__xt_ct_tg_timeout_put(timeout);
	178	out:
	179	rcu_read_unlock();
	180	return ret;
	181	#else
	182	return -EOPNOTSUPP;
	183	#endif
	184	}
	185
deedb590 DB	186	static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info)
	187	{
	188	switch (info->flags & (XT_CT_ZONE_DIR_ORIG \|
	189	XT_CT_ZONE_DIR_REPL)) {
	190	case XT_CT_ZONE_DIR_ORIG:
	191	return NF_CT_ZONE_DIR_ORIG;
	192	case XT_CT_ZONE_DIR_REPL:
	193	return NF_CT_ZONE_DIR_REPL;
	194	default:
	195	return NF_CT_DEFAULT_ZONE_DIR;
	196	}
	197	}
	198
d52ed437 PNA	199	static int xt_ct_tg_check(const struct xt_tgchk_param *par,
d52ed437 PNA	200	struct xt_ct_target_info_v1 *info)
24de58f4	201	{
308ac914	202	struct nf_conntrack_zone zone;
24de58f4	203	struct nf_conn *ct;
4610476d	204	int ret = -EOPNOTSUPP;
236df005	205
24de58f4	206	if (info->flags & XT_CT_NOTRACK) {
27e7190e	207	ct = NULL;
24de58f4 PNA	208	goto out;
	209	}
	210
	211	#ifndef CONFIG_NF_CONNTRACK_ZONES
deedb590	212	if (info->zone \|\| info->flags & (XT_CT_ZONE_DIR_ORIG \|
5e8018fc DB	213	XT_CT_ZONE_DIR_REPL \|
5e8018fc DB	214	XT_CT_ZONE_MARK))
24de58f4 PNA	215	goto err1;
	216	#endif
	217
ecb2421b	218	ret = nf_ct_netns_get(par->net, par->family);
24de58f4 PNA	219	if (ret < 0)
	220	goto err1;
	221
308ac914 DB	222	memset(&zone, 0, sizeof(zone));
308ac914 DB	223	zone.id = info->zone;
deedb590	224	zone.dir = xt_ct_flags_to_dir(info);
5e8018fc DB	225	if (info->flags & XT_CT_ZONE_MARK)
5e8018fc DB	226	zone.flags \|= NF_CT_FLAG_MARK;
308ac914 DB	227
308ac914 DB	228	ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL);
1a727c63 DC	229	if (!ct) {
1a727c63 DC	230	ret = -ENOMEM;
24de58f4	231	goto err2;
1a727c63	232	}
24de58f4 PNA	233
	234	ret = 0;
	235	if ((info->ct_events \|\| info->exp_events) &&
	236	!nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
14abfa16 EL	237	GFP_KERNEL)) {
14abfa16 EL	238	ret = -EINVAL;
24de58f4	239	goto err3;
14abfa16	240	}
24de58f4 PNA	241
24de58f4 PNA	242	if (info->helper[0]) {
236df005 PNA	243	ret = xt_ct_set_helper(ct, info->helper, par);
236df005 PNA	244	if (ret < 0)
1afc5679	245	goto err3;
24de58f4 PNA	246	}
24de58f4 PNA	247
6cf51852	248	if (info->timeout[0]) {
236df005 PNA	249	ret = xt_ct_set_timeout(ct, par, info->timeout);
	250	if (ret < 0)
	251	goto err3;
24de58f4	252	}
0838aa7f PNA	253	__set_bit(IPS_CONFIRMED_BIT, &ct->status);
0838aa7f PNA	254	nf_conntrack_get(&ct->ct_general);
24de58f4 PNA	255	out:
	256	info->ct = ct;
	257	return 0;
	258
	259	err3:
9cf94eab	260	nf_ct_tmpl_free(ct);
24de58f4	261	err2:
ecb2421b	262	nf_ct_netns_put(par->net, par->family);
24de58f4 PNA	263	err1:
	264	return ret;
	265	}
	266
d52ed437	267	static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
84f3bb9a PM	268	{
84f3bb9a PM	269	struct xt_ct_target_info *info = par->targinfo;
d52ed437 PNA	270	struct xt_ct_target_info_v1 info_v1 = {
	271	.flags = info->flags,
	272	.zone = info->zone,
	273	.ct_events = info->ct_events,
	274	.exp_events = info->exp_events,
	275	};
	276	int ret;
84f3bb9a	277
5474f57f PNA	278	if (info->flags & ~XT_CT_NOTRACK)
	279	return -EINVAL;
	280
d52ed437	281	memcpy(info_v1.helper, info->helper, sizeof(info->helper));
84f3bb9a	282
d52ed437 PNA	283	ret = xt_ct_tg_check(par, &info_v1);
	284	if (ret < 0)
	285	return ret;
	286
	287	info->ct = info_v1.ct;
	288
	289	return ret;
	290	}
	291
	292	static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
	293	{
5474f57f PNA	294	struct xt_ct_target_info_v1 *info = par->targinfo;
	295
	296	if (info->flags & ~XT_CT_NOTRACK)
	297	return -EINVAL;
	298
	299	return xt_ct_tg_check(par, par->targinfo);
	300	}
	301
	302	static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
	303	{
	304	struct xt_ct_target_info_v1 *info = par->targinfo;
	305
	306	if (info->flags & ~XT_CT_MASK)
	307	return -EINVAL;
	308
d52ed437	309	return xt_ct_tg_check(par, par->targinfo);
84f3bb9a PM	310	}
84f3bb9a PM	311
236df005	312	static void xt_ct_destroy_timeout(struct nf_conn *ct)
24de58f4	313	{
24de58f4 PNA	314	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	315	struct nf_conn_timeout *timeout_ext;
	316	typeof(nf_ct_timeout_put_hook) timeout_put;
236df005 PNA	317
	318	rcu_read_lock();
	319	timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
	320
	321	if (timeout_put) {
	322	timeout_ext = nf_ct_timeout_find(ct);
ae2d708e	323	if (timeout_ext) {
236df005	324	timeout_put(timeout_ext->timeout);
ae2d708e PNA	325	RCU_INIT_POINTER(timeout_ext->timeout, NULL);
ae2d708e PNA	326	}
236df005 PNA	327	}
236df005 PNA	328	rcu_read_unlock();
24de58f4	329	#endif
236df005 PNA	330	}
236df005 PNA	331
d52ed437 PNA	332	static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
d52ed437 PNA	333	struct xt_ct_target_info_v1 *info)
236df005	334	{
236df005 PNA	335	struct nf_conn *ct = info->ct;
	336	struct nf_conn_help *help;
	337
27e7190e	338	if (ct && !nf_ct_is_untracked(ct)) {
24de58f4 PNA	339	help = nfct_help(ct);
	340	if (help)
	341	module_put(help->helper->me);
	342
ecb2421b	343	nf_ct_netns_put(par->net, par->family);
24de58f4	344
236df005	345	xt_ct_destroy_timeout(ct);
27e7190e	346	nf_ct_put(info->ct);
24de58f4	347	}
d52ed437 PNA	348	}
	349
	350	static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
	351	{
	352	struct xt_ct_target_info *info = par->targinfo;
	353	struct xt_ct_target_info_v1 info_v1 = {
	354	.flags = info->flags,
	355	.zone = info->zone,
	356	.ct_events = info->ct_events,
	357	.exp_events = info->exp_events,
	358	.ct = info->ct,
	359	};
	360	memcpy(info_v1.helper, info->helper, sizeof(info->helper));
	361
	362	xt_ct_tg_destroy(par, &info_v1);
	363	}
	364
	365	static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
	366	{
	367	xt_ct_tg_destroy(par, par->targinfo);
24de58f4 PNA	368	}
	369
	370	static struct xt_target xt_ct_tg_reg[] __read_mostly = {
	371	{
	372	.name = "CT",
	373	.family = NFPROTO_UNSPEC,
	374	.targetsize = sizeof(struct xt_ct_target_info),
ec231890	375	.usersize = offsetof(struct xt_ct_target_info, ct),
24de58f4 PNA	376	.checkentry = xt_ct_tg_check_v0,
	377	.destroy = xt_ct_tg_destroy_v0,
	378	.target = xt_ct_target_v0,
	379	.table = "raw",
	380	.me = THIS_MODULE,
	381	},
	382	{
	383	.name = "CT",
	384	.family = NFPROTO_UNSPEC,
	385	.revision = 1,
	386	.targetsize = sizeof(struct xt_ct_target_info_v1),
ec231890	387	.usersize = offsetof(struct xt_ct_target_info, ct),
24de58f4 PNA	388	.checkentry = xt_ct_tg_check_v1,
	389	.destroy = xt_ct_tg_destroy_v1,
	390	.target = xt_ct_target_v1,
	391	.table = "raw",
	392	.me = THIS_MODULE,
	393	},
5474f57f PNA	394	{
	395	.name = "CT",
	396	.family = NFPROTO_UNSPEC,
	397	.revision = 2,
	398	.targetsize = sizeof(struct xt_ct_target_info_v1),
ec231890	399	.usersize = offsetof(struct xt_ct_target_info, ct),
5474f57f PNA	400	.checkentry = xt_ct_tg_check_v2,
	401	.destroy = xt_ct_tg_destroy_v1,
	402	.target = xt_ct_target_v1,
	403	.table = "raw",
	404	.me = THIS_MODULE,
	405	},
84f3bb9a PM	406	};
84f3bb9a PM	407
10db9069 PNA	408	static unsigned int
	409	notrack_tg(struct sk_buff skb, const struct xt_action_param par)
	410	{
	411	/* Previously seen (loopback)? Ignore. */
a9e419dc	412	if (skb->_nfct != 0)
10db9069 PNA	413	return XT_CONTINUE;
10db9069 PNA	414
c74454fa	415	nf_ct_set(skb, nf_ct_untracked_get(), IP_CT_NEW);
cb9c6836	416	nf_conntrack_get(skb_nfct(skb));
10db9069 PNA	417
	418	return XT_CONTINUE;
	419	}
	420
	421	static int notrack_chk(const struct xt_tgchk_param *par)
	422	{
	423	if (!par->net->xt.notrack_deprecated_warning) {
	424	pr_info("netfilter: NOTRACK target is deprecated, "
	425	"use CT instead or upgrade iptables\n");
	426	par->net->xt.notrack_deprecated_warning = true;
	427	}
	428	return 0;
	429	}
	430
	431	static struct xt_target notrack_tg_reg __read_mostly = {
	432	.name = "NOTRACK",
	433	.revision = 0,
	434	.family = NFPROTO_UNSPEC,
	435	.checkentry = notrack_chk,
	436	.target = notrack_tg,
	437	.table = "raw",
	438	.me = THIS_MODULE,
	439	};
	440
84f3bb9a PM	441	static int __init xt_ct_tg_init(void)
84f3bb9a PM	442	{
10db9069 PNA	443	int ret;
	444
	445	ret = xt_register_target(&notrack_tg_reg);
	446	if (ret < 0)
	447	return ret;
	448
	449	ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
	450	if (ret < 0) {
	451	xt_unregister_target(&notrack_tg_reg);
	452	return ret;
	453	}
	454	return 0;
84f3bb9a PM	455	}
	456
	457	static void __exit xt_ct_tg_exit(void)
	458	{
24de58f4	459	xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
10db9069	460	xt_unregister_target(&notrack_tg_reg);
84f3bb9a PM	461	}
	462
	463	module_init(xt_ct_tg_init);
	464	module_exit(xt_ct_tg_exit);
	465
	466	MODULE_LICENSE("GPL");
	467	MODULE_DESCRIPTION("Xtables: connection tracking target");
	468	MODULE_ALIAS("ipt_CT");
	469	MODULE_ALIAS("ip6t_CT");
10db9069 PNA	470	MODULE_ALIAS("ipt_NOTRACK");
10db9069 PNA	471	MODULE_ALIAS("ip6t_NOTRACK");