[linux-2.6-block.git] / net / sched / act_nat.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Stateless NAT actions
 *
 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/tc_act/tc_nat.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>
#include <net/icmp.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/tc_act/tc_nat.h>
#include <net/tcp.h>
#include <net/udp.h>


static unsigned int nat_net_id;
static struct tc_action_ops act_nat_ops;

static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
	[TCA_NAT_PARMS]	= { .len = sizeof(struct tc_nat) },
};

static int tcf_nat_init(struct net *net, struct nlattr *nla, struct nlattr *est,
			struct tc_action **a, int ovr, int bind,
			bool rtnl_held,	struct tcf_proto *tp,
			u32 flags, struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, nat_net_id);
	struct nlattr *tb[TCA_NAT_MAX + 1];
	struct tcf_chain *goto_ch = NULL;
	struct tc_nat *parm;
	int ret = 0, err;
	struct tcf_nat *p;
	u32 index;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested_deprecated(tb, TCA_NAT_MAX, nla, nat_policy,
					  NULL);
	if (err < 0)
		return err;

	if (tb[TCA_NAT_PARMS] == NULL)
		return -EINVAL;
	parm = nla_data(tb[TCA_NAT_PARMS]);
	index = parm->index;
	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (!err) {
		ret = tcf_idr_create(tn, index, est, a,
				     &act_nat_ops, bind, false, 0);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else if (err > 0) {
		if (bind)
			return 0;
		if (!ovr) {
			tcf_idr_release(*a, bind);
			return -EEXIST;
		}
	} else {
		return err;
	}
	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	if (err < 0)
		goto release_idr;
	p = to_tcf_nat(*a);

	spin_lock_bh(&p->tcf_lock);
	p->old_addr = parm->old_addr;
	p->new_addr = parm->new_addr;
	p->mask = parm->mask;
	p->flags = parm->flags;

	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
	spin_unlock_bh(&p->tcf_lock);
	if (goto_ch)
		tcf_chain_put_by_act(goto_ch);

	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);

	return ret;
release_idr:
	tcf_idr_release(*a, bind);
	return err;
}

static int tcf_nat_act(struct sk_buff *skb, const struct tc_action *a,
		       struct tcf_result *res)
{
	struct tcf_nat *p = to_tcf_nat(a);
	struct iphdr *iph;
	__be32 old_addr;
	__be32 new_addr;
	__be32 mask;
	__be32 addr;
	int egress;
	int action;
	int ihl;
	int noff;

	spin_lock(&p->tcf_lock);

	tcf_lastuse_update(&p->tcf_tm);
	old_addr = p->old_addr;
	new_addr = p->new_addr;
	mask = p->mask;
	egress = p->flags & TCA_NAT_FLAG_EGRESS;
	action = p->tcf_action;

	bstats_update(&p->tcf_bstats, skb);

	spin_unlock(&p->tcf_lock);

	if (unlikely(action == TC_ACT_SHOT))
		goto drop;

	noff = skb_network_offset(skb);
	if (!pskb_may_pull(skb, sizeof(*iph) + noff))
		goto drop;

	iph = ip_hdr(skb);

	if (egress)
		addr = iph->saddr;
	else
		addr = iph->daddr;

	if (!((old_addr ^ addr) & mask)) {
		if (skb_try_make_writable(skb, sizeof(*iph) + noff))
			goto drop;

		new_addr &= mask;
		new_addr |= addr & ~mask;

		/* Rewrite IP header */
		iph = ip_hdr(skb);
		if (egress)
			iph->saddr = new_addr;
		else
			iph->daddr = new_addr;

		csum_replace4(&iph->check, addr, new_addr);
	} else if ((iph->frag_off & htons(IP_OFFSET)) ||
		   iph->protocol != IPPROTO_ICMP) {
		goto out;
	}

	ihl = iph->ihl * 4;

	/* It would be nice to share code with stateful NAT. */
	switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
	case IPPROTO_TCP:
	{
		struct tcphdr *tcph;

		if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) ||
		    skb_try_make_writable(skb, ihl + sizeof(*tcph) + noff))
			goto drop;

		tcph = (void *)(skb_network_header(skb) + ihl);
		inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr,
					 true);
		break;
	}
	case IPPROTO_UDP:
	{
		struct udphdr *udph;

		if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) ||
		    skb_try_make_writable(skb, ihl + sizeof(*udph) + noff))
			goto drop;

		udph = (void *)(skb_network_header(skb) + ihl);
		if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) {
			inet_proto_csum_replace4(&udph->check, skb, addr,
						 new_addr, true);
			if (!udph->check)
				udph->check = CSUM_MANGLED_0;
		}
		break;
	}
	case IPPROTO_ICMP:
	{
		struct icmphdr *icmph;

		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff))
			goto drop;

		icmph = (void *)(skb_network_header(skb) + ihl);

		if (!icmp_is_err(icmph->type))
			break;

		if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + sizeof(*iph) +
					noff))
			goto drop;

		icmph = (void *)(skb_network_header(skb) + ihl);
		iph = (void *)(icmph + 1);
		if (egress)
			addr = iph->daddr;
		else
			addr = iph->saddr;

		if ((old_addr ^ addr) & mask)
			break;

		if (skb_try_make_writable(skb, ihl + sizeof(*icmph) +
					  sizeof(*iph) + noff))
			goto drop;

		icmph = (void *)(skb_network_header(skb) + ihl);
		iph = (void *)(icmph + 1);

		new_addr &= mask;
		new_addr |= addr & ~mask;

		/* XXX Fix up the inner checksums. */
		if (egress)
			iph->daddr = new_addr;
		else
			iph->saddr = new_addr;

		inet_proto_csum_replace4(&icmph->checksum, skb, addr, new_addr,
					 false);
		break;
	}
	default:
		break;
	}

out:
	return action;

drop:
	spin_lock(&p->tcf_lock);
	p->tcf_qstats.drops++;
	spin_unlock(&p->tcf_lock);
	return TC_ACT_SHOT;
}

static int tcf_nat_dump(struct sk_buff *skb, struct tc_action *a,
			int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_nat *p = to_tcf_nat(a);
	struct tc_nat opt = {
		.index    = p->tcf_index,
		.refcnt   = refcount_read(&p->tcf_refcnt) - ref,
		.bindcnt  = atomic_read(&p->tcf_bindcnt) - bind,
	};
	struct tcf_t t;

	spin_lock_bh(&p->tcf_lock);
	opt.old_addr = p->old_addr;
	opt.new_addr = p->new_addr;
	opt.mask = p->mask;
	opt.flags = p->flags;
	opt.action = p->tcf_action;

	if (nla_put(skb, TCA_NAT_PARMS, sizeof(opt), &opt))
		goto nla_put_failure;

	tcf_tm_dump(&t, &p->tcf_tm);
	if (nla_put_64bit(skb, TCA_NAT_TM, sizeof(t), &t, TCA_NAT_PAD))
		goto nla_put_failure;
	spin_unlock_bh(&p->tcf_lock);

	return skb->len;

nla_put_failure:
	spin_unlock_bh(&p->tcf_lock);
	nlmsg_trim(skb, b);
	return -1;
}

static int tcf_nat_walker(struct net *net, struct sk_buff *skb,
			  struct netlink_callback *cb, int type,
			  const struct tc_action_ops *ops,
			  struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, nat_net_id);

	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}

static int tcf_nat_search(struct net *net, struct tc_action **a, u32 index)
{
	struct tc_action_net *tn = net_generic(net, nat_net_id);

	return tcf_idr_search(tn, a, index);
}

static struct tc_action_ops act_nat_ops = {
	.kind		=	"nat",
	.id		=	TCA_ID_NAT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_nat_act,
	.dump		=	tcf_nat_dump,
	.init		=	tcf_nat_init,
	.walk		=	tcf_nat_walker,
	.lookup		=	tcf_nat_search,
	.size		=	sizeof(struct tcf_nat),
};

static __net_init int nat_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, nat_net_id);

	return tc_action_net_init(net, tn, &act_nat_ops);
}

static void __net_exit nat_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, nat_net_id);
}

static struct pernet_operations nat_net_ops = {
	.init = nat_init_net,
	.exit_batch = nat_exit_net,
	.id   = &nat_net_id,
	.size = sizeof(struct tc_action_net),
};

MODULE_DESCRIPTION("Stateless NAT actions");
MODULE_LICENSE("GPL");

static int __init nat_init_module(void)
{
	return tcf_register_action(&act_nat_ops, &nat_net_ops);
}

static void __exit nat_cleanup_module(void)
{
	tcf_unregister_action(&act_nat_ops, &nat_net_ops);
}

module_init(nat_init_module);
module_exit(nat_cleanup_module);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
b4219952 HX	2	/*
	3	* Stateless NAT actions
	4	*
	5	* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au>
b4219952 HX	6	*/
	7
	8	#include <linux/errno.h>
	9	#include <linux/init.h>
	10	#include <linux/kernel.h>
	11	#include <linux/module.h>
	12	#include <linux/netfilter.h>
	13	#include <linux/rtnetlink.h>
	14	#include <linux/skbuff.h>
	15	#include <linux/slab.h>
	16	#include <linux/spinlock.h>
	17	#include <linux/string.h>
	18	#include <linux/tc_act/tc_nat.h>
	19	#include <net/act_api.h>
1e45d043	20	#include <net/pkt_cls.h>
b4219952 HX	21	#include <net/icmp.h>
	22	#include <net/ip.h>
	23	#include <net/netlink.h>
	24	#include <net/tc_act/tc_nat.h>
	25	#include <net/tcp.h>
	26	#include <net/udp.h>
	27
	28
c7d03a00	29	static unsigned int nat_net_id;
a85a970a	30	static struct tc_action_ops act_nat_ops;
ddf97ccd	31
53b2bf3f PM	32	static const struct nla_policy nat_policy[TCA_NAT_MAX + 1] = {
	33	[TCA_NAT_PARMS] = { .len = sizeof(struct tc_nat) },
	34	};
	35
c1b52739	36	static int tcf_nat_init(struct net net, struct nlattr nla, struct nlattr *est,
589dad6d	37	struct tc_action **a, int ovr, int bind,
85d0966f	38	bool rtnl_held, struct tcf_proto *tp,
abbb0d33	39	u32 flags, struct netlink_ext_ack *extack)
b4219952	40	{
ddf97ccd	41	struct tc_action_net *tn = net_generic(net, nat_net_id);
7ba699c6	42	struct nlattr *tb[TCA_NAT_MAX + 1];
1e45d043	43	struct tcf_chain *goto_ch = NULL;
b4219952	44	struct tc_nat *parm;
cee63723	45	int ret = 0, err;
b4219952	46	struct tcf_nat *p;
7be8ef2c	47	u32 index;
b4219952	48
cee63723	49	if (nla == NULL)
b4219952 HX	50	return -EINVAL;
b4219952 HX	51
8cb08174 JB	52	err = nla_parse_nested_deprecated(tb, TCA_NAT_MAX, nla, nat_policy,
8cb08174 JB	53	NULL);
cee63723 PM	54	if (err < 0)
	55	return err;
	56
53b2bf3f	57	if (tb[TCA_NAT_PARMS] == NULL)
b4219952	58	return -EINVAL;
7ba699c6	59	parm = nla_data(tb[TCA_NAT_PARMS]);
7be8ef2c DL	60	index = parm->index;
7be8ef2c DL	61	err = tcf_idr_check_alloc(tn, &index, a, bind);
0190c1d4	62	if (!err) {
7be8ef2c	63	ret = tcf_idr_create(tn, index, est, a,
e3822678	64	&act_nat_ops, bind, false, 0);
0190c1d4	65	if (ret) {
7be8ef2c	66	tcf_idr_cleanup(tn, index);
86062033	67	return ret;
0190c1d4	68	}
b4219952	69	ret = ACT_P_CREATED;
0190c1d4	70	} else if (err > 0) {
1a29321e JHS	71	if (bind)
1a29321e JHS	72	return 0;
4e8ddd7f VB	73	if (!ovr) {
4e8ddd7f VB	74	tcf_idr_release(*a, bind);
b4219952	75	return -EEXIST;
4e8ddd7f	76	}
0190c1d4 VB	77	} else {
0190c1d4 VB	78	return err;
b4219952	79	}
1e45d043 DC	80	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
	81	if (err < 0)
	82	goto release_idr;
a85a970a	83	p = to_tcf_nat(*a);
b4219952 HX	84
	85	spin_lock_bh(&p->tcf_lock);
	86	p->old_addr = parm->old_addr;
	87	p->new_addr = parm->new_addr;
	88	p->mask = parm->mask;
	89	p->flags = parm->flags;
	90
1e45d043	91	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
b4219952	92	spin_unlock_bh(&p->tcf_lock);
1e45d043 DC	93	if (goto_ch)
1e45d043 DC	94	tcf_chain_put_by_act(goto_ch);
b4219952 HX	95
b4219952 HX	96	if (ret == ACT_P_CREATED)
65a206c0	97	tcf_idr_insert(tn, *a);
b4219952 HX	98
b4219952 HX	99	return ret;
1e45d043 DC	100	release_idr:
	101	tcf_idr_release(*a, bind);
	102	return err;
b4219952 HX	103	}
b4219952 HX	104
0390514f JHS	105	static int tcf_nat_act(struct sk_buff skb, const struct tc_action a,
0390514f JHS	106	struct tcf_result *res)
b4219952	107	{
a85a970a	108	struct tcf_nat *p = to_tcf_nat(a);
b4219952 HX	109	struct iphdr *iph;
	110	__be32 old_addr;
	111	__be32 new_addr;
	112	__be32 mask;
	113	__be32 addr;
	114	int egress;
	115	int action;
	116	int ihl;
36d12690	117	int noff;
b4219952 HX	118
	119	spin_lock(&p->tcf_lock);
	120
9c4a4e48	121	tcf_lastuse_update(&p->tcf_tm);
b4219952 HX	122	old_addr = p->old_addr;
	123	new_addr = p->new_addr;
	124	mask = p->mask;
	125	egress = p->flags & TCA_NAT_FLAG_EGRESS;
	126	action = p->tcf_action;
	127
bfe0d029	128	bstats_update(&p->tcf_bstats, skb);
b4219952 HX	129
	130	spin_unlock(&p->tcf_lock);
	131
	132	if (unlikely(action == TC_ACT_SHOT))
	133	goto drop;
	134
36d12690 CG	135	noff = skb_network_offset(skb);
36d12690 CG	136	if (!pskb_may_pull(skb, sizeof(*iph) + noff))
b4219952 HX	137	goto drop;
	138
	139	iph = ip_hdr(skb);
	140
	141	if (egress)
	142	addr = iph->saddr;
	143	else
	144	addr = iph->daddr;
	145
	146	if (!((old_addr ^ addr) & mask)) {
3697649f	147	if (skb_try_make_writable(skb, sizeof(*iph) + noff))
b4219952 HX	148	goto drop;
	149
	150	new_addr &= mask;
	151	new_addr \|= addr & ~mask;
	152
	153	/* Rewrite IP header */
	154	iph = ip_hdr(skb);
	155	if (egress)
	156	iph->saddr = new_addr;
	157	else
	158	iph->daddr = new_addr;
	159
be0ea7d5	160	csum_replace4(&iph->check, addr, new_addr);
33c29dde CG	161	} else if ((iph->frag_off & htons(IP_OFFSET)) \|\|
	162	iph->protocol != IPPROTO_ICMP) {
	163	goto out;
b4219952 HX	164	}
	165
	166	ihl = iph->ihl * 4;
	167
	168	/* It would be nice to share code with stateful NAT. */
	169	switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
	170	case IPPROTO_TCP:
	171	{
	172	struct tcphdr *tcph;
	173
36d12690	174	if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) \|\|
3697649f	175	skb_try_make_writable(skb, ihl + sizeof(*tcph) + noff))
b4219952 HX	176	goto drop;
	177
	178	tcph = (void *)(skb_network_header(skb) + ihl);
4b048d6d TH	179	inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr,
4b048d6d TH	180	true);
b4219952 HX	181	break;
	182	}
	183	case IPPROTO_UDP:
	184	{
	185	struct udphdr *udph;
	186
36d12690	187	if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) \|\|
3697649f	188	skb_try_make_writable(skb, ihl + sizeof(*udph) + noff))
b4219952 HX	189	goto drop;
	190
	191	udph = (void *)(skb_network_header(skb) + ihl);
	192	if (udph->check \|\| skb->ip_summed == CHECKSUM_PARTIAL) {
be0ea7d5	193	inet_proto_csum_replace4(&udph->check, skb, addr,
4b048d6d	194	new_addr, true);
b4219952 HX	195	if (!udph->check)
	196	udph->check = CSUM_MANGLED_0;
	197	}
	198	break;
	199	}
	200	case IPPROTO_ICMP:
	201	{
	202	struct icmphdr *icmph;
	203
36d12690	204	if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff))
b4219952 HX	205	goto drop;
	206
	207	icmph = (void *)(skb_network_header(skb) + ihl);
	208
54074f1d	209	if (!icmp_is_err(icmph->type))
b4219952 HX	210	break;
b4219952 HX	211
36d12690 CG	212	if (!pskb_may_pull(skb, ihl + sizeof(icmph) + sizeof(iph) +
36d12690 CG	213	noff))
70c2efa5 CG	214	goto drop;
70c2efa5 CG	215
072d79a3	216	icmph = (void *)(skb_network_header(skb) + ihl);
b4219952 HX	217	iph = (void *)(icmph + 1);
	218	if (egress)
	219	addr = iph->daddr;
	220	else
	221	addr = iph->saddr;
	222
	223	if ((old_addr ^ addr) & mask)
	224	break;
	225
3697649f DB	226	if (skb_try_make_writable(skb, ihl + sizeof(*icmph) +
3697649f DB	227	sizeof(*iph) + noff))
b4219952 HX	228	goto drop;
	229
	230	icmph = (void *)(skb_network_header(skb) + ihl);
	231	iph = (void *)(icmph + 1);
	232
	233	new_addr &= mask;
	234	new_addr \|= addr & ~mask;
	235
	236	/* XXX Fix up the inner checksums. */
	237	if (egress)
	238	iph->daddr = new_addr;
	239	else
	240	iph->saddr = new_addr;
	241
be0ea7d5	242	inet_proto_csum_replace4(&icmph->checksum, skb, addr, new_addr,
4b048d6d	243	false);
b4219952 HX	244	break;
	245	}
	246	default:
	247	break;
	248	}
	249
33c29dde	250	out:
b4219952 HX	251	return action;
	252
	253	drop:
	254	spin_lock(&p->tcf_lock);
	255	p->tcf_qstats.drops++;
	256	spin_unlock(&p->tcf_lock);
	257	return TC_ACT_SHOT;
	258	}
	259
	260	static int tcf_nat_dump(struct sk_buff skb, struct tc_action a,
	261	int bind, int ref)
	262	{
	263	unsigned char *b = skb_tail_pointer(skb);
a85a970a	264	struct tcf_nat *p = to_tcf_nat(a);
1c40be12	265	struct tc_nat opt = {
1c40be12	266	.index = p->tcf_index,
036bb443 VB	267	.refcnt = refcount_read(&p->tcf_refcnt) - ref,
036bb443 VB	268	.bindcnt = atomic_read(&p->tcf_bindcnt) - bind,
1c40be12	269	};
b4219952	270	struct tcf_t t;
b4219952	271
f20a4d01 VB	272	spin_lock_bh(&p->tcf_lock);
	273	opt.old_addr = p->old_addr;
	274	opt.new_addr = p->new_addr;
	275	opt.mask = p->mask;
	276	opt.flags = p->flags;
	277	opt.action = p->tcf_action;
	278
1b34ec43 DM	279	if (nla_put(skb, TCA_NAT_PARMS, sizeof(opt), &opt))
1b34ec43 DM	280	goto nla_put_failure;
48d8ee16 JHS	281
48d8ee16 JHS	282	tcf_tm_dump(&t, &p->tcf_tm);
9854518e	283	if (nla_put_64bit(skb, TCA_NAT_TM, sizeof(t), &t, TCA_NAT_PAD))
1b34ec43	284	goto nla_put_failure;
f20a4d01	285	spin_unlock_bh(&p->tcf_lock);
b4219952	286
b4219952 HX	287	return skb->len;
b4219952 HX	288
7ba699c6	289	nla_put_failure:
f20a4d01	290	spin_unlock_bh(&p->tcf_lock);
b4219952	291	nlmsg_trim(skb, b);
b4219952 HX	292	return -1;
	293	}
	294
ddf97ccd WC	295	static int tcf_nat_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	296	struct netlink_callback *cb, int type,
41780105 AA	297	const struct tc_action_ops *ops,
41780105 AA	298	struct netlink_ext_ack *extack)
ddf97ccd WC	299	{
	300	struct tc_action_net *tn = net_generic(net, nat_net_id);
	301
b3620145	302	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	303	}
ddf97ccd WC	304
f061b48c	305	static int tcf_nat_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	306	{
	307	struct tc_action_net *tn = net_generic(net, nat_net_id);
	308
65a206c0	309	return tcf_idr_search(tn, a, index);
ddf97ccd WC	310	}
ddf97ccd WC	311
b4219952 HX	312	static struct tc_action_ops act_nat_ops = {
b4219952 HX	313	.kind = "nat",
eddd2cf1	314	.id = TCA_ID_NAT,
b4219952	315	.owner = THIS_MODULE,
0390514f	316	.act = tcf_nat_act,
b4219952	317	.dump = tcf_nat_dump,
b4219952	318	.init = tcf_nat_init,
ddf97ccd WC	319	.walk = tcf_nat_walker,
ddf97ccd WC	320	.lookup = tcf_nat_search,
a85a970a	321	.size = sizeof(struct tcf_nat),
ddf97ccd WC	322	};
	323
	324	static __net_init int nat_init_net(struct net *net)
	325	{
	326	struct tc_action_net *tn = net_generic(net, nat_net_id);
	327
981471bd	328	return tc_action_net_init(net, tn, &act_nat_ops);
ddf97ccd WC	329	}
ddf97ccd WC	330
039af9c6	331	static void __net_exit nat_exit_net(struct list_head *net_list)
ddf97ccd	332	{
039af9c6	333	tc_action_net_exit(net_list, nat_net_id);
ddf97ccd WC	334	}
	335
	336	static struct pernet_operations nat_net_ops = {
	337	.init = nat_init_net,
039af9c6	338	.exit_batch = nat_exit_net,
ddf97ccd WC	339	.id = &nat_net_id,
ddf97ccd WC	340	.size = sizeof(struct tc_action_net),
b4219952 HX	341	};
	342
	343	MODULE_DESCRIPTION("Stateless NAT actions");
	344	MODULE_LICENSE("GPL");
	345
	346	static int __init nat_init_module(void)
	347	{
ddf97ccd	348	return tcf_register_action(&act_nat_ops, &nat_net_ops);
b4219952 HX	349	}
	350
	351	static void __exit nat_cleanup_module(void)
	352	{
ddf97ccd	353	tcf_unregister_action(&act_nat_ops, &nat_net_ops);
b4219952 HX	354	}
	355
	356	module_init(nat_init_module);
	357	module_exit(nat_cleanup_module);