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

/*
 * net/sched/ipt.c	iptables target interface
 *
 *TODO: Add other tables. For now we only support the ipv4 table targets
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Copyright:	Jamal Hadi Salim (2002-4)
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/tc_act/tc_ipt.h>
#include <net/tc_act/tc_ipt.h>

#include <linux/netfilter_ipv4/ip_tables.h>


#define IPT_TAB_MASK     15
static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
static u32 ipt_idx_gen;
static DEFINE_RWLOCK(ipt_lock);

static struct tcf_hashinfo ipt_hash_info = {
	.htab	=	tcf_ipt_ht,
	.hmask	=	IPT_TAB_MASK,
	.lock	=	&ipt_lock,
};

static int ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
{
	struct xt_target *target;
	int ret = 0;

	target = xt_request_find_target(AF_INET, t->u.user.name,
					t->u.user.revision);
	if (!target)
		return -ENOENT;

	t->u.kernel.target = target;

	ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
			      table, hook, 0, 0);
	if (ret) {
		module_put(t->u.kernel.target->me);
		return ret;
	}
	if (t->u.kernel.target->checkentry
	    && !t->u.kernel.target->checkentry(table, NULL,
					       t->u.kernel.target, t->data,
					       hook)) {
		module_put(t->u.kernel.target->me);
		ret = -EINVAL;
	}

	return ret;
}

static void ipt_destroy_target(struct ipt_entry_target *t)
{
	if (t->u.kernel.target->destroy)
		t->u.kernel.target->destroy(t->u.kernel.target, t->data);
	module_put(t->u.kernel.target->me);
}

static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
{
	int ret = 0;
	if (ipt) {
		if (bind)
			ipt->tcf_bindcnt--;
		ipt->tcf_refcnt--;
		if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
			ipt_destroy_target(ipt->tcfi_t);
			kfree(ipt->tcfi_tname);
			kfree(ipt->tcfi_t);
			tcf_hash_destroy(&ipt->common, &ipt_hash_info);
			ret = ACT_P_DELETED;
		}
	}
	return ret;
}

static int tcf_ipt_init(struct nlattr *nla, struct nlattr *est,
			struct tc_action *a, int ovr, int bind)
{
	struct nlattr *tb[TCA_IPT_MAX + 1];
	struct tcf_ipt *ipt;
	struct tcf_common *pc;
	struct ipt_entry_target *td, *t;
	char *tname;
	int ret = 0, err;
	u32 hook = 0;
	u32 index = 0;

	if (nla == NULL)
		return -EINVAL;

	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, NULL);
	if (err < 0)
		return err;

	if (tb[TCA_IPT_HOOK] == NULL ||
	    nla_len(tb[TCA_IPT_HOOK]) < sizeof(u32))
		return -EINVAL;
	if (tb[TCA_IPT_TARG] == NULL ||
	    nla_len(tb[TCA_IPT_TARG]) < sizeof(*t))
		return -EINVAL;
	td = (struct ipt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
		return -EINVAL;

	if (tb[TCA_IPT_INDEX] != NULL &&
	    nla_len(tb[TCA_IPT_INDEX]) >= sizeof(u32))
		index = *(u32 *)nla_data(tb[TCA_IPT_INDEX]);

	pc = tcf_hash_check(index, a, bind, &ipt_hash_info);
	if (!pc) {
		pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind,
				     &ipt_idx_gen, &ipt_hash_info);
		if (unlikely(!pc))
			return -ENOMEM;
		ret = ACT_P_CREATED;
	} else {
		if (!ovr) {
			tcf_ipt_release(to_ipt(pc), bind);
			return -EEXIST;
		}
	}
	ipt = to_ipt(pc);

	hook = *(u32 *)nla_data(tb[TCA_IPT_HOOK]);

	err = -ENOMEM;
	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
	if (unlikely(!tname))
		goto err1;
	if (tb[TCA_IPT_TABLE] == NULL ||
	    nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
		strcpy(tname, "mangle");

	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
	if (unlikely(!t))
		goto err2;

	if ((err = ipt_init_target(t, tname, hook)) < 0)
		goto err3;

	spin_lock_bh(&ipt->tcf_lock);
	if (ret != ACT_P_CREATED) {
		ipt_destroy_target(ipt->tcfi_t);
		kfree(ipt->tcfi_tname);
		kfree(ipt->tcfi_t);
	}
	ipt->tcfi_tname = tname;
	ipt->tcfi_t     = t;
	ipt->tcfi_hook  = hook;
	spin_unlock_bh(&ipt->tcf_lock);
	if (ret == ACT_P_CREATED)
		tcf_hash_insert(pc, &ipt_hash_info);
	return ret;

err3:
	kfree(t);
err2:
	kfree(tname);
err1:
	kfree(pc);
	return err;
}

static int tcf_ipt_cleanup(struct tc_action *a, int bind)
{
	struct tcf_ipt *ipt = a->priv;
	return tcf_ipt_release(ipt, bind);
}

static int tcf_ipt(struct sk_buff *skb, struct tc_action *a,
		   struct tcf_result *res)
{
	int ret = 0, result = 0;
	struct tcf_ipt *ipt = a->priv;

	if (skb_cloned(skb)) {
		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
			return TC_ACT_UNSPEC;
	}

	spin_lock(&ipt->tcf_lock);

	ipt->tcf_tm.lastuse = jiffies;
	ipt->tcf_bstats.bytes += skb->len;
	ipt->tcf_bstats.packets++;

	/* yes, we have to worry about both in and out dev
	 worry later - danger - this API seems to have changed
	 from earlier kernels */
	ret = ipt->tcfi_t->u.kernel.target->target(skb, skb->dev, NULL,
						   ipt->tcfi_hook,
						   ipt->tcfi_t->u.kernel.target,
						   ipt->tcfi_t->data);
	switch (ret) {
	case NF_ACCEPT:
		result = TC_ACT_OK;
		break;
	case NF_DROP:
		result = TC_ACT_SHOT;
		ipt->tcf_qstats.drops++;
		break;
	case IPT_CONTINUE:
		result = TC_ACT_PIPE;
		break;
	default:
		if (net_ratelimit())
			printk("Bogus netfilter code %d assume ACCEPT\n", ret);
		result = TC_POLICE_OK;
		break;
	}
	spin_unlock(&ipt->tcf_lock);
	return result;

}

static int tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
{
	unsigned char *b = skb_tail_pointer(skb);
	struct tcf_ipt *ipt = a->priv;
	struct ipt_entry_target *t;
	struct tcf_t tm;
	struct tc_cnt c;

	/* for simple targets kernel size == user size
	** user name = target name
	** for foolproof you need to not assume this
	*/

	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
	if (unlikely(!t))
		goto nla_put_failure;

	c.bindcnt = ipt->tcf_bindcnt - bind;
	c.refcnt = ipt->tcf_refcnt - ref;
	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);

	NLA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t);
	NLA_PUT_U32(skb, TCA_IPT_INDEX, ipt->tcf_index);
	NLA_PUT_U32(skb, TCA_IPT_HOOK, ipt->tcfi_hook);
	NLA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
	NLA_PUT_STRING(skb, TCA_IPT_TABLE, ipt->tcfi_tname);
	tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
	tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
	tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
	NLA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
	kfree(t);
	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	kfree(t);
	return -1;
}

static struct tc_action_ops act_ipt_ops = {
	.kind		=	"ipt",
	.hinfo		=	&ipt_hash_info,
	.type		=	TCA_ACT_IPT,
	.capab		=	TCA_CAP_NONE,
	.owner		=	THIS_MODULE,
	.act		=	tcf_ipt,
	.dump		=	tcf_ipt_dump,
	.cleanup	=	tcf_ipt_cleanup,
	.lookup		=	tcf_hash_search,
	.init		=	tcf_ipt_init,
	.walk		=	tcf_generic_walker
};

MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
MODULE_DESCRIPTION("Iptables target actions");
MODULE_LICENSE("GPL");

static int __init ipt_init_module(void)
{
	return tcf_register_action(&act_ipt_ops);
}

static void __exit ipt_cleanup_module(void)
{
	tcf_unregister_action(&act_ipt_ops);
}

module_init(ipt_init_module);
module_exit(ipt_cleanup_module);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/sched/ipt.c iptables target interface
	3	*
	4	*TODO: Add other tables. For now we only support the ipv4 table targets
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*
	11	* Copyright: Jamal Hadi Salim (2002-4)
	12	*/
	13
1da177e4 LT	14	#include <linux/types.h>
1da177e4 LT	15	#include <linux/kernel.h>
1da177e4	16	#include <linux/string.h>
1da177e4	17	#include <linux/errno.h>
1da177e4 LT	18	#include <linux/skbuff.h>
	19	#include <linux/rtnetlink.h>
	20	#include <linux/module.h>
	21	#include <linux/init.h>
dc5fc579	22	#include <net/netlink.h>
1da177e4 LT	23	#include <net/pkt_sched.h>
	24	#include <linux/tc_act/tc_ipt.h>
	25	#include <net/tc_act/tc_ipt.h>
	26
	27	#include <linux/netfilter_ipv4/ip_tables.h>
	28
1da177e4	29
e9ce1cd3 DM	30	#define IPT_TAB_MASK 15
	31	static struct tcf_common *tcf_ipt_ht[IPT_TAB_MASK + 1];
	32	static u32 ipt_idx_gen;
1da177e4 LT	33	static DEFINE_RWLOCK(ipt_lock);
1da177e4 LT	34
e9ce1cd3 DM	35	static struct tcf_hashinfo ipt_hash_info = {
	36	.htab = tcf_ipt_ht,
	37	.hmask = IPT_TAB_MASK,
	38	.lock = &ipt_lock,
	39	};
1da177e4	40
e9ce1cd3	41	static int ipt_init_target(struct ipt_entry_target t, char table, unsigned int hook)
1da177e4	42	{
e60a13e0	43	struct xt_target *target;
1da177e4 LT	44	int ret = 0;
1da177e4 LT	45
239a87c8 PM	46	target = xt_request_find_target(AF_INET, t->u.user.name,
239a87c8 PM	47	t->u.user.revision);
1da177e4 LT	48	if (!target)
	49	return -ENOENT;
	50
1da177e4 LT	51	t->u.kernel.target = target;
1da177e4 LT	52
18118cdb PM	53	ret = xt_check_target(target, AF_INET, t->u.target_size - sizeof(*t),
18118cdb PM	54	table, hook, 0, 0);
239a87c8 PM	55	if (ret) {
239a87c8 PM	56	module_put(t->u.kernel.target->me);
18118cdb	57	return ret;
239a87c8	58	}
1da177e4	59	if (t->u.kernel.target->checkentry
1c524830	60	&& !t->u.kernel.target->checkentry(table, NULL,
10297b99	61	t->u.kernel.target, t->data,
1da177e4	62	hook)) {
1da177e4 LT	63	module_put(t->u.kernel.target->me);
	64	ret = -EINVAL;
	65	}
	66
	67	return ret;
	68	}
	69
e9ce1cd3	70	static void ipt_destroy_target(struct ipt_entry_target *t)
1da177e4 LT	71	{
1da177e4 LT	72	if (t->u.kernel.target->destroy)
efa74165	73	t->u.kernel.target->destroy(t->u.kernel.target, t->data);
10297b99	74	module_put(t->u.kernel.target->me);
1da177e4 LT	75	}
1da177e4 LT	76
e9ce1cd3	77	static int tcf_ipt_release(struct tcf_ipt *ipt, int bind)
1da177e4 LT	78	{
1da177e4 LT	79	int ret = 0;
e9ce1cd3	80	if (ipt) {
1da177e4	81	if (bind)
e9ce1cd3 DM	82	ipt->tcf_bindcnt--;
	83	ipt->tcf_refcnt--;
	84	if (ipt->tcf_bindcnt <= 0 && ipt->tcf_refcnt <= 0) {
	85	ipt_destroy_target(ipt->tcfi_t);
	86	kfree(ipt->tcfi_tname);
	87	kfree(ipt->tcfi_t);
	88	tcf_hash_destroy(&ipt->common, &ipt_hash_info);
1da177e4 LT	89	ret = ACT_P_DELETED;
	90	}
	91	}
	92	return ret;
	93	}
	94
7ba699c6	95	static int tcf_ipt_init(struct nlattr nla, struct nlattr est,
e9ce1cd3	96	struct tc_action *a, int ovr, int bind)
1da177e4	97	{
7ba699c6	98	struct nlattr *tb[TCA_IPT_MAX + 1];
e9ce1cd3 DM	99	struct tcf_ipt *ipt;
e9ce1cd3 DM	100	struct tcf_common *pc;
1da177e4 LT	101	struct ipt_entry_target td, t;
	102	char *tname;
	103	int ret = 0, err;
	104	u32 hook = 0;
	105	u32 index = 0;
	106
cee63723	107	if (nla == NULL)
1da177e4 LT	108	return -EINVAL;
1da177e4 LT	109
cee63723 PM	110	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, NULL);
	111	if (err < 0)
	112	return err;
	113
7ba699c6 PM	114	if (tb[TCA_IPT_HOOK] == NULL \|\|
7ba699c6 PM	115	nla_len(tb[TCA_IPT_HOOK]) < sizeof(u32))
1da177e4	116	return -EINVAL;
7ba699c6 PM	117	if (tb[TCA_IPT_TARG] == NULL \|\|
7ba699c6 PM	118	nla_len(tb[TCA_IPT_TARG]) < sizeof(*t))
1da177e4	119	return -EINVAL;
7ba699c6 PM	120	td = (struct ipt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
7ba699c6 PM	121	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
1da177e4 LT	122	return -EINVAL;
1da177e4 LT	123
7ba699c6 PM	124	if (tb[TCA_IPT_INDEX] != NULL &&
	125	nla_len(tb[TCA_IPT_INDEX]) >= sizeof(u32))
	126	index = (u32 )nla_data(tb[TCA_IPT_INDEX]);
1da177e4	127
e9ce1cd3 DM	128	pc = tcf_hash_check(index, a, bind, &ipt_hash_info);
	129	if (!pc) {
	130	pc = tcf_hash_create(index, est, a, sizeof(*ipt), bind,
	131	&ipt_idx_gen, &ipt_hash_info);
	132	if (unlikely(!pc))
1da177e4 LT	133	return -ENOMEM;
	134	ret = ACT_P_CREATED;
	135	} else {
	136	if (!ovr) {
e9ce1cd3	137	tcf_ipt_release(to_ipt(pc), bind);
1da177e4 LT	138	return -EEXIST;
	139	}
	140	}
e9ce1cd3	141	ipt = to_ipt(pc);
1da177e4	142
7ba699c6	143	hook = (u32 )nla_data(tb[TCA_IPT_HOOK]);
1da177e4 LT	144
	145	err = -ENOMEM;
	146	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	147	if (unlikely(!tname))
1da177e4	148	goto err1;
7ba699c6 PM	149	if (tb[TCA_IPT_TABLE] == NULL \|\|
7ba699c6 PM	150	nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	151	strcpy(tname, "mangle");
1da177e4 LT	152
c7b1b249	153	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	154	if (unlikely(!t))
1da177e4	155	goto err2;
1da177e4 LT	156
	157	if ((err = ipt_init_target(t, tname, hook)) < 0)
	158	goto err3;
	159
e9ce1cd3	160	spin_lock_bh(&ipt->tcf_lock);
1da177e4	161	if (ret != ACT_P_CREATED) {
e9ce1cd3 DM	162	ipt_destroy_target(ipt->tcfi_t);
	163	kfree(ipt->tcfi_tname);
	164	kfree(ipt->tcfi_t);
1da177e4	165	}
e9ce1cd3 DM	166	ipt->tcfi_tname = tname;
	167	ipt->tcfi_t = t;
	168	ipt->tcfi_hook = hook;
	169	spin_unlock_bh(&ipt->tcf_lock);
1da177e4	170	if (ret == ACT_P_CREATED)
e9ce1cd3	171	tcf_hash_insert(pc, &ipt_hash_info);
1da177e4 LT	172	return ret;
	173
	174	err3:
	175	kfree(t);
	176	err2:
	177	kfree(tname);
	178	err1:
e9ce1cd3	179	kfree(pc);
1da177e4 LT	180	return err;
	181	}
	182
e9ce1cd3	183	static int tcf_ipt_cleanup(struct tc_action *a, int bind)
1da177e4	184	{
e9ce1cd3 DM	185	struct tcf_ipt *ipt = a->priv;
e9ce1cd3 DM	186	return tcf_ipt_release(ipt, bind);
1da177e4 LT	187	}
1da177e4 LT	188
e9ce1cd3 DM	189	static int tcf_ipt(struct sk_buff skb, struct tc_action a,
e9ce1cd3 DM	190	struct tcf_result *res)
1da177e4 LT	191	{
1da177e4 LT	192	int ret = 0, result = 0;
e9ce1cd3	193	struct tcf_ipt *ipt = a->priv;
1da177e4 LT	194
	195	if (skb_cloned(skb)) {
	196	if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
	197	return TC_ACT_UNSPEC;
	198	}
	199
e9ce1cd3	200	spin_lock(&ipt->tcf_lock);
1da177e4	201
e9ce1cd3 DM	202	ipt->tcf_tm.lastuse = jiffies;
	203	ipt->tcf_bstats.bytes += skb->len;
	204	ipt->tcf_bstats.packets++;
1da177e4 LT	205
	206	/* yes, we have to worry about both in and out dev
	207	worry later - danger - this API seems to have changed
	208	from earlier kernels */
3db05fea	209	ret = ipt->tcfi_t->u.kernel.target->target(skb, skb->dev, NULL,
e9ce1cd3 DM	210	ipt->tcfi_hook,
e9ce1cd3 DM	211	ipt->tcfi_t->u.kernel.target,
fe1cb108	212	ipt->tcfi_t->data);
1da177e4 LT	213	switch (ret) {
	214	case NF_ACCEPT:
	215	result = TC_ACT_OK;
	216	break;
	217	case NF_DROP:
	218	result = TC_ACT_SHOT;
e9ce1cd3	219	ipt->tcf_qstats.drops++;
1da177e4 LT	220	break;
	221	case IPT_CONTINUE:
	222	result = TC_ACT_PIPE;
	223	break;
	224	default:
	225	if (net_ratelimit())
	226	printk("Bogus netfilter code %d assume ACCEPT\n", ret);
	227	result = TC_POLICE_OK;
	228	break;
	229	}
e9ce1cd3	230	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	231	return result;
	232
	233	}
	234
e9ce1cd3	235	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind, int ref)
1da177e4	236	{
27a884dc	237	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	238	struct tcf_ipt *ipt = a->priv;
1da177e4 LT	239	struct ipt_entry_target *t;
	240	struct tcf_t tm;
	241	struct tc_cnt c;
1da177e4 LT	242
	243	/* for simple targets kernel size == user size
	244	** user name = target name
	245	** for foolproof you need to not assume this
	246	*/
	247
c7b1b249	248	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	249	if (unlikely(!t))
7ba699c6	250	goto nla_put_failure;
1da177e4	251
e9ce1cd3 DM	252	c.bindcnt = ipt->tcf_bindcnt - bind;
e9ce1cd3 DM	253	c.refcnt = ipt->tcf_refcnt - ref;
e9ce1cd3 DM	254	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	255
7ba699c6	256	NLA_PUT(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t);
24beeab5 PM	257	NLA_PUT_U32(skb, TCA_IPT_INDEX, ipt->tcf_index);
24beeab5 PM	258	NLA_PUT_U32(skb, TCA_IPT_HOOK, ipt->tcfi_hook);
7ba699c6	259	NLA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
57e1c487	260	NLA_PUT_STRING(skb, TCA_IPT_TABLE, ipt->tcfi_tname);
e9ce1cd3 DM	261	tm.install = jiffies_to_clock_t(jiffies - ipt->tcf_tm.install);
	262	tm.lastuse = jiffies_to_clock_t(jiffies - ipt->tcf_tm.lastuse);
	263	tm.expires = jiffies_to_clock_t(ipt->tcf_tm.expires);
7ba699c6	264	NLA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
1da177e4 LT	265	kfree(t);
	266	return skb->len;
	267
7ba699c6	268	nla_put_failure:
dc5fc579	269	nlmsg_trim(skb, b);
1da177e4 LT	270	kfree(t);
	271	return -1;
	272	}
	273
	274	static struct tc_action_ops act_ipt_ops = {
	275	.kind = "ipt",
e9ce1cd3	276	.hinfo = &ipt_hash_info,
1da177e4 LT	277	.type = TCA_ACT_IPT,
	278	.capab = TCA_CAP_NONE,
	279	.owner = THIS_MODULE,
	280	.act = tcf_ipt,
	281	.dump = tcf_ipt_dump,
	282	.cleanup = tcf_ipt_cleanup,
	283	.lookup = tcf_hash_search,
	284	.init = tcf_ipt_init,
	285	.walk = tcf_generic_walker
	286	};
	287
	288	MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
	289	MODULE_DESCRIPTION("Iptables target actions");
	290	MODULE_LICENSE("GPL");
	291
e9ce1cd3	292	static int __init ipt_init_module(void)
1da177e4 LT	293	{
	294	return tcf_register_action(&act_ipt_ops);
	295	}
	296
e9ce1cd3	297	static void __exit ipt_cleanup_module(void)
1da177e4 LT	298	{
	299	tcf_unregister_action(&act_ipt_ops);
	300	}
	301
	302	module_init(ipt_init_module);
	303	module_exit(ipt_cleanup_module);