[people/ms/linux.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, struct tcf_proto *tp,
			u32 flags, struct netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, nat_net_id);
	bool bind = flags & TCA_ACT_FLAGS_BIND;
	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, flags);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else if (err > 0) {
		if (bind)
			return 0;
		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
			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);

	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,
695176bf	37	struct tc_action *a, struct tcf_proto tp,
abbb0d33	38	u32 flags, struct netlink_ext_ack *extack)
b4219952	39	{
ddf97ccd	40	struct tc_action_net *tn = net_generic(net, nat_net_id);
695176bf	41	bool bind = flags & TCA_ACT_FLAGS_BIND;
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,
40bd094d	64	&act_nat_ops, bind, false, flags);
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;
695176bf	73	if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
4e8ddd7f	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	95
b4219952	96	return ret;
1e45d043 DC	97	release_idr:
	98	tcf_idr_release(*a, bind);
	99	return err;
b4219952 HX	100	}
b4219952 HX	101
0390514f JHS	102	static int tcf_nat_act(struct sk_buff skb, const struct tc_action a,
0390514f JHS	103	struct tcf_result *res)
b4219952	104	{
a85a970a	105	struct tcf_nat *p = to_tcf_nat(a);
b4219952 HX	106	struct iphdr *iph;
	107	__be32 old_addr;
	108	__be32 new_addr;
	109	__be32 mask;
	110	__be32 addr;
	111	int egress;
	112	int action;
	113	int ihl;
36d12690	114	int noff;
b4219952 HX	115
	116	spin_lock(&p->tcf_lock);
	117
9c4a4e48	118	tcf_lastuse_update(&p->tcf_tm);
b4219952 HX	119	old_addr = p->old_addr;
	120	new_addr = p->new_addr;
	121	mask = p->mask;
	122	egress = p->flags & TCA_NAT_FLAG_EGRESS;
	123	action = p->tcf_action;
	124
bfe0d029	125	bstats_update(&p->tcf_bstats, skb);
b4219952 HX	126
	127	spin_unlock(&p->tcf_lock);
	128
	129	if (unlikely(action == TC_ACT_SHOT))
	130	goto drop;
	131
36d12690 CG	132	noff = skb_network_offset(skb);
36d12690 CG	133	if (!pskb_may_pull(skb, sizeof(*iph) + noff))
b4219952 HX	134	goto drop;
	135
	136	iph = ip_hdr(skb);
	137
	138	if (egress)
	139	addr = iph->saddr;
	140	else
	141	addr = iph->daddr;
	142
	143	if (!((old_addr ^ addr) & mask)) {
3697649f	144	if (skb_try_make_writable(skb, sizeof(*iph) + noff))
b4219952 HX	145	goto drop;
	146
	147	new_addr &= mask;
	148	new_addr \|= addr & ~mask;
	149
	150	/* Rewrite IP header */
	151	iph = ip_hdr(skb);
	152	if (egress)
	153	iph->saddr = new_addr;
	154	else
	155	iph->daddr = new_addr;
	156
be0ea7d5	157	csum_replace4(&iph->check, addr, new_addr);
33c29dde CG	158	} else if ((iph->frag_off & htons(IP_OFFSET)) \|\|
	159	iph->protocol != IPPROTO_ICMP) {
	160	goto out;
b4219952 HX	161	}
	162
	163	ihl = iph->ihl * 4;
	164
	165	/* It would be nice to share code with stateful NAT. */
	166	switch (iph->frag_off & htons(IP_OFFSET) ? 0 : iph->protocol) {
	167	case IPPROTO_TCP:
	168	{
	169	struct tcphdr *tcph;
	170
36d12690	171	if (!pskb_may_pull(skb, ihl + sizeof(*tcph) + noff) \|\|
3697649f	172	skb_try_make_writable(skb, ihl + sizeof(*tcph) + noff))
b4219952 HX	173	goto drop;
	174
	175	tcph = (void *)(skb_network_header(skb) + ihl);
4b048d6d TH	176	inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr,
4b048d6d TH	177	true);
b4219952 HX	178	break;
	179	}
	180	case IPPROTO_UDP:
	181	{
	182	struct udphdr *udph;
	183
36d12690	184	if (!pskb_may_pull(skb, ihl + sizeof(*udph) + noff) \|\|
3697649f	185	skb_try_make_writable(skb, ihl + sizeof(*udph) + noff))
b4219952 HX	186	goto drop;
	187
	188	udph = (void *)(skb_network_header(skb) + ihl);
	189	if (udph->check \|\| skb->ip_summed == CHECKSUM_PARTIAL) {
be0ea7d5	190	inet_proto_csum_replace4(&udph->check, skb, addr,
4b048d6d	191	new_addr, true);
b4219952 HX	192	if (!udph->check)
	193	udph->check = CSUM_MANGLED_0;
	194	}
	195	break;
	196	}
	197	case IPPROTO_ICMP:
	198	{
	199	struct icmphdr *icmph;
	200
36d12690	201	if (!pskb_may_pull(skb, ihl + sizeof(*icmph) + noff))
b4219952 HX	202	goto drop;
	203
	204	icmph = (void *)(skb_network_header(skb) + ihl);
	205
54074f1d	206	if (!icmp_is_err(icmph->type))
b4219952 HX	207	break;
b4219952 HX	208
36d12690 CG	209	if (!pskb_may_pull(skb, ihl + sizeof(icmph) + sizeof(iph) +
36d12690 CG	210	noff))
70c2efa5 CG	211	goto drop;
70c2efa5 CG	212
072d79a3	213	icmph = (void *)(skb_network_header(skb) + ihl);
b4219952 HX	214	iph = (void *)(icmph + 1);
	215	if (egress)
	216	addr = iph->daddr;
	217	else
	218	addr = iph->saddr;
	219
	220	if ((old_addr ^ addr) & mask)
	221	break;
	222
3697649f DB	223	if (skb_try_make_writable(skb, ihl + sizeof(*icmph) +
3697649f DB	224	sizeof(*iph) + noff))
b4219952 HX	225	goto drop;
	226
	227	icmph = (void *)(skb_network_header(skb) + ihl);
	228	iph = (void *)(icmph + 1);
	229
	230	new_addr &= mask;
	231	new_addr \|= addr & ~mask;
	232
	233	/* XXX Fix up the inner checksums. */
	234	if (egress)
	235	iph->daddr = new_addr;
	236	else
	237	iph->saddr = new_addr;
	238
be0ea7d5	239	inet_proto_csum_replace4(&icmph->checksum, skb, addr, new_addr,
4b048d6d	240	false);
b4219952 HX	241	break;
	242	}
	243	default:
	244	break;
	245	}
	246
33c29dde	247	out:
b4219952 HX	248	return action;
	249
	250	drop:
	251	spin_lock(&p->tcf_lock);
	252	p->tcf_qstats.drops++;
	253	spin_unlock(&p->tcf_lock);
	254	return TC_ACT_SHOT;
	255	}
	256
	257	static int tcf_nat_dump(struct sk_buff skb, struct tc_action a,
	258	int bind, int ref)
	259	{
	260	unsigned char *b = skb_tail_pointer(skb);
a85a970a	261	struct tcf_nat *p = to_tcf_nat(a);
1c40be12	262	struct tc_nat opt = {
1c40be12	263	.index = p->tcf_index,
036bb443 VB	264	.refcnt = refcount_read(&p->tcf_refcnt) - ref,
036bb443 VB	265	.bindcnt = atomic_read(&p->tcf_bindcnt) - bind,
1c40be12	266	};
b4219952	267	struct tcf_t t;
b4219952	268
f20a4d01 VB	269	spin_lock_bh(&p->tcf_lock);
	270	opt.old_addr = p->old_addr;
	271	opt.new_addr = p->new_addr;
	272	opt.mask = p->mask;
	273	opt.flags = p->flags;
	274	opt.action = p->tcf_action;
	275
1b34ec43 DM	276	if (nla_put(skb, TCA_NAT_PARMS, sizeof(opt), &opt))
1b34ec43 DM	277	goto nla_put_failure;
48d8ee16 JHS	278
48d8ee16 JHS	279	tcf_tm_dump(&t, &p->tcf_tm);
9854518e	280	if (nla_put_64bit(skb, TCA_NAT_TM, sizeof(t), &t, TCA_NAT_PAD))
1b34ec43	281	goto nla_put_failure;
f20a4d01	282	spin_unlock_bh(&p->tcf_lock);
b4219952	283
b4219952 HX	284	return skb->len;
b4219952 HX	285
7ba699c6	286	nla_put_failure:
f20a4d01	287	spin_unlock_bh(&p->tcf_lock);
b4219952	288	nlmsg_trim(skb, b);
b4219952 HX	289	return -1;
	290	}
	291
ddf97ccd WC	292	static int tcf_nat_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	293	struct netlink_callback *cb, int type,
41780105 AA	294	const struct tc_action_ops *ops,
41780105 AA	295	struct netlink_ext_ack *extack)
ddf97ccd WC	296	{
	297	struct tc_action_net *tn = net_generic(net, nat_net_id);
	298
b3620145	299	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	300	}
ddf97ccd WC	301
f061b48c	302	static int tcf_nat_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	303	{
	304	struct tc_action_net *tn = net_generic(net, nat_net_id);
	305
65a206c0	306	return tcf_idr_search(tn, a, index);
ddf97ccd WC	307	}
ddf97ccd WC	308
b4219952 HX	309	static struct tc_action_ops act_nat_ops = {
b4219952 HX	310	.kind = "nat",
eddd2cf1	311	.id = TCA_ID_NAT,
b4219952	312	.owner = THIS_MODULE,
0390514f	313	.act = tcf_nat_act,
b4219952	314	.dump = tcf_nat_dump,
b4219952	315	.init = tcf_nat_init,
ddf97ccd WC	316	.walk = tcf_nat_walker,
ddf97ccd WC	317	.lookup = tcf_nat_search,
a85a970a	318	.size = sizeof(struct tcf_nat),
ddf97ccd WC	319	};
	320
	321	static __net_init int nat_init_net(struct net *net)
	322	{
	323	struct tc_action_net *tn = net_generic(net, nat_net_id);
	324
981471bd	325	return tc_action_net_init(net, tn, &act_nat_ops);
ddf97ccd WC	326	}
ddf97ccd WC	327
039af9c6	328	static void __net_exit nat_exit_net(struct list_head *net_list)
ddf97ccd	329	{
039af9c6	330	tc_action_net_exit(net_list, nat_net_id);
ddf97ccd WC	331	}
	332
	333	static struct pernet_operations nat_net_ops = {
	334	.init = nat_init_net,
039af9c6	335	.exit_batch = nat_exit_net,
ddf97ccd WC	336	.id = &nat_net_id,
ddf97ccd WC	337	.size = sizeof(struct tc_action_net),
b4219952 HX	338	};
	339
	340	MODULE_DESCRIPTION("Stateless NAT actions");
	341	MODULE_LICENSE("GPL");
	342
	343	static int __init nat_init_module(void)
	344	{
ddf97ccd	345	return tcf_register_action(&act_nat_ops, &nat_net_ops);
b4219952 HX	346	}
	347
	348	static void __exit nat_cleanup_module(void)
	349	{
ddf97ccd	350	tcf_unregister_action(&act_nat_ops, &nat_net_ops);
b4219952 HX	351	}
	352
	353	module_init(nat_init_module);
	354	module_exit(nat_cleanup_module);