[linux.git] / net / sched / act_ipt.c

/*
 * net/sched/act_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 (2002-13)
 */

#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 <linux/slab.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 int ipt_net_id;

static int xt_net_id;

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

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

	t->u.kernel.target = target;
	par.table     = table;
	par.entryinfo = NULL;
	par.target    = target;
	par.targinfo  = t->data;
	par.hook_mask = hook;
	par.family    = NFPROTO_IPV4;

	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
	if (ret < 0) {
		module_put(t->u.kernel.target->me);
		return ret;
	}
	return 0;
}

static void ipt_destroy_target(struct xt_entry_target *t)
{
	struct xt_tgdtor_param par = {
		.target   = t->u.kernel.target,
		.targinfo = t->data,
		.family   = NFPROTO_IPV4,
	};
	if (par.target->destroy != NULL)
		par.target->destroy(&par);
	module_put(par.target->me);
}

static void tcf_ipt_release(struct tc_action *a, int bind)
{
	struct tcf_ipt *ipt = to_ipt(a);
	ipt_destroy_target(ipt->tcfi_t);
	kfree(ipt->tcfi_tname);
	kfree(ipt->tcfi_t);
}

static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
	[TCA_IPT_TABLE]	= { .type = NLA_STRING, .len = IFNAMSIZ },
	[TCA_IPT_HOOK]	= { .type = NLA_U32 },
	[TCA_IPT_INDEX]	= { .type = NLA_U32 },
	[TCA_IPT_TARG]	= { .len = sizeof(struct xt_entry_target) },
};

static int __tcf_ipt_init(struct tc_action_net *tn, 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 xt_entry_target *td, *t;
	char *tname;
	int ret = 0, err, exists = 0;
	u32 hook = 0;
	u32 index = 0;

	if (nla == NULL)
		return -EINVAL;

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

	if (tb[TCA_IPT_INDEX] != NULL)
		index = nla_get_u32(tb[TCA_IPT_INDEX]);

	exists = tcf_hash_check(tn, index, a, bind);
	if (exists && bind)
		return 0;

	if (tb[TCA_IPT_HOOK] == NULL || tb[TCA_IPT_TARG] == NULL) {
		if (exists)
			tcf_hash_release(a, bind);
		return -EINVAL;
	}

	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
		return -EINVAL;

	if (!tcf_hash_check(tn, index, a, bind)) {
		ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind,
				      false);
		if (ret)
			return ret;
		ret = ACT_P_CREATED;
	} else {
		if (bind)/* dont override defaults */
			return 0;
		tcf_hash_release(a, bind);

		if (!ovr)
			return -EEXIST;
	}
	ipt = to_ipt(a);

	hook = nla_get_u32(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;

	err = ipt_init_target(t, tname, hook);
	if (err < 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(tn, a);
	return ret;

err3:
	kfree(t);
err2:
	kfree(tname);
err1:
	if (ret == ACT_P_CREATED)
		tcf_hash_cleanup(a, est);
	return err;
}

static int tcf_ipt_init(struct net *net, struct nlattr *nla,
			struct nlattr *est, struct tc_action *a, int ovr,
			int bind)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

	return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
}

static int tcf_xt_init(struct net *net, struct nlattr *nla,
		       struct nlattr *est, struct tc_action *a, int ovr,
		       int bind)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

	return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
}

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

	if (skb_unclone(skb, GFP_ATOMIC))
		return TC_ACT_UNSPEC;

	spin_lock(&ipt->tcf_lock);

	tcf_lastuse_update(&ipt->tcf_tm);
	bstats_update(&ipt->tcf_bstats, skb);

	/* yes, we have to worry about both in and out dev
	 * worry later - danger - this API seems to have changed
	 * from earlier kernels
	 */
	par.net	     = dev_net(skb->dev);
	par.in       = skb->dev;
	par.out      = NULL;
	par.hooknum  = ipt->tcfi_hook;
	par.target   = ipt->tcfi_t->u.kernel.target;
	par.targinfo = ipt->tcfi_t->data;
	par.family   = NFPROTO_IPV4;
	ret = par.target->target(skb, &par);

	switch (ret) {
	case NF_ACCEPT:
		result = TC_ACT_OK;
		break;
	case NF_DROP:
		result = TC_ACT_SHOT;
		ipt->tcf_qstats.drops++;
		break;
	case XT_CONTINUE:
		result = TC_ACT_PIPE;
		break;
	default:
		net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
				       ret);
		result = TC_ACT_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 xt_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);

	if (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))
		goto nla_put_failure;

	tcf_tm_dump(&tm, &ipt->tcf_tm);
	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
		goto nla_put_failure;

	kfree(t);
	return skb->len;

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

static int tcf_ipt_walker(struct net *net, struct sk_buff *skb,
			  struct netlink_callback *cb, int type,
			  struct tc_action *a)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

	return tcf_generic_walker(tn, skb, cb, type, a);
}

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

	return tcf_hash_search(tn, a, index);
}

static struct tc_action_ops act_ipt_ops = {
	.kind		=	"ipt",
	.type		=	TCA_ACT_IPT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_ipt,
	.dump		=	tcf_ipt_dump,
	.cleanup	=	tcf_ipt_release,
	.init		=	tcf_ipt_init,
	.walk		=	tcf_ipt_walker,
	.lookup		=	tcf_ipt_search,
};

static __net_init int ipt_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

	return tc_action_net_init(tn, &act_ipt_ops, IPT_TAB_MASK);
}

static void __net_exit ipt_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

	tc_action_net_exit(tn);
}

static struct pernet_operations ipt_net_ops = {
	.init = ipt_init_net,
	.exit = ipt_exit_net,
	.id   = &ipt_net_id,
	.size = sizeof(struct tc_action_net),
};

static int tcf_xt_walker(struct net *net, struct sk_buff *skb,
			 struct netlink_callback *cb, int type,
			 struct tc_action *a)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

	return tcf_generic_walker(tn, skb, cb, type, a);
}

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

	return tcf_hash_search(tn, a, index);
}

static struct tc_action_ops act_xt_ops = {
	.kind		=	"xt",
	.type		=	TCA_ACT_XT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_ipt,
	.dump		=	tcf_ipt_dump,
	.cleanup	=	tcf_ipt_release,
	.init		=	tcf_xt_init,
	.walk		=	tcf_xt_walker,
	.lookup		=	tcf_xt_search,
};

static __net_init int xt_init_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

	return tc_action_net_init(tn, &act_xt_ops, IPT_TAB_MASK);
}

static void __net_exit xt_exit_net(struct net *net)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

	tc_action_net_exit(tn);
}

static struct pernet_operations xt_net_ops = {
	.init = xt_init_net,
	.exit = xt_exit_net,
	.id   = &xt_net_id,
	.size = sizeof(struct tc_action_net),
};

MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
MODULE_DESCRIPTION("Iptables target actions");
MODULE_LICENSE("GPL");
MODULE_ALIAS("act_xt");

static int __init ipt_init_module(void)
{
	int ret1, ret2;

	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
	if (ret1 < 0)
		pr_err("Failed to load xt action\n");

	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
	if (ret2 < 0)
		pr_err("Failed to load ipt action\n");

	if (ret1 < 0 && ret2 < 0) {
		return ret1;
	} else
		return 0;
}

static void __exit ipt_cleanup_module(void)
{
	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
}

module_init(ipt_init_module);
module_exit(ipt_cleanup_module);
Commit	Line	Data
1da177e4	1	/*
0c6965dd	2	* net/sched/act_ipt.c iptables target interface
1da177e4 LT	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	*
0dcffd09	11	* Copyright: Jamal Hadi Salim (2002-13)
1da177e4 LT	12	*/
1da177e4 LT	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>
5a0e3ad6	22	#include <linux/slab.h>
dc5fc579	23	#include <net/netlink.h>
1da177e4 LT	24	#include <net/pkt_sched.h>
	25	#include <linux/tc_act/tc_ipt.h>
	26	#include <net/tc_act/tc_ipt.h>
	27
	28	#include <linux/netfilter_ipv4/ip_tables.h>
	29
1da177e4	30
e9ce1cd3	31	#define IPT_TAB_MASK 15
1da177e4	32
ddf97ccd WC	33	static int ipt_net_id;
	34
	35	static int xt_net_id;
	36
0b0f43fe JHS	37	static int ipt_init_target(struct xt_entry_target t, char table,
0b0f43fe JHS	38	unsigned int hook)
1da177e4	39	{
af5d6dc2	40	struct xt_tgchk_param par;
e60a13e0	41	struct xt_target *target;
1da177e4 LT	42	int ret = 0;
1da177e4 LT	43
239a87c8 PM	44	target = xt_request_find_target(AF_INET, t->u.user.name,
239a87c8 PM	45	t->u.user.revision);
d2a7b6ba JE	46	if (IS_ERR(target))
d2a7b6ba JE	47	return PTR_ERR(target);
1da177e4	48
1da177e4	49	t->u.kernel.target = target;
af5d6dc2 JE	50	par.table = table;
	51	par.entryinfo = NULL;
	52	par.target = target;
	53	par.targinfo = t->data;
	54	par.hook_mask = hook;
916a917d	55	par.family = NFPROTO_IPV4;
1da177e4	56
916a917d	57	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
367c6790	58	if (ret < 0) {
239a87c8	59	module_put(t->u.kernel.target->me);
18118cdb	60	return ret;
239a87c8	61	}
367c6790	62	return 0;
1da177e4 LT	63	}
1da177e4 LT	64
87a2e70d	65	static void ipt_destroy_target(struct xt_entry_target *t)
1da177e4	66	{
a2df1648 JE	67	struct xt_tgdtor_param par = {
	68	.target = t->u.kernel.target,
	69	.targinfo = t->data,
44ef548f	70	.family = NFPROTO_IPV4,
a2df1648 JE	71	};
	72	if (par.target->destroy != NULL)
	73	par.target->destroy(&par);
	74	module_put(par.target->me);
1da177e4 LT	75	}
1da177e4 LT	76
a5b5c958	77	static void tcf_ipt_release(struct tc_action *a, int bind)
1da177e4	78	{
86062033	79	struct tcf_ipt *ipt = to_ipt(a);
a5b5c958 WC	80	ipt_destroy_target(ipt->tcfi_t);
	81	kfree(ipt->tcfi_tname);
	82	kfree(ipt->tcfi_t);
1da177e4 LT	83	}
1da177e4 LT	84
53b2bf3f PM	85	static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
	86	[TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
	87	[TCA_IPT_HOOK] = { .type = NLA_U32 },
	88	[TCA_IPT_INDEX] = { .type = NLA_U32 },
87a2e70d	89	[TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
53b2bf3f PM	90	};
53b2bf3f PM	91
ddf97ccd WC	92	static int __tcf_ipt_init(struct tc_action_net tn, struct nlattr nla,
	93	struct nlattr est, struct tc_action a, int ovr,
	94	int bind)
1da177e4	95	{
7ba699c6	96	struct nlattr *tb[TCA_IPT_MAX + 1];
e9ce1cd3	97	struct tcf_ipt *ipt;
87a2e70d	98	struct xt_entry_target td, t;
1da177e4	99	char *tname;
a57f19d3	100	int ret = 0, err, exists = 0;
1da177e4 LT	101	u32 hook = 0;
	102	u32 index = 0;
	103
cee63723	104	if (nla == NULL)
1da177e4 LT	105	return -EINVAL;
1da177e4 LT	106
53b2bf3f	107	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy);
cee63723 PM	108	if (err < 0)
	109	return err;
	110
a57f19d3 JHS	111	if (tb[TCA_IPT_INDEX] != NULL)
	112	index = nla_get_u32(tb[TCA_IPT_INDEX]);
	113
	114	exists = tcf_hash_check(tn, index, a, bind);
	115	if (exists && bind)
	116	return 0;
	117
	118	if (tb[TCA_IPT_HOOK] == NULL \|\| tb[TCA_IPT_TARG] == NULL) {
	119	if (exists)
	120	tcf_hash_release(a, bind);
1da177e4	121	return -EINVAL;
a57f19d3	122	}
53b2bf3f	123
87a2e70d	124	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
7ba699c6	125	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size)
1da177e4 LT	126	return -EINVAL;
1da177e4 LT	127
ddf97ccd WC	128	if (!tcf_hash_check(tn, index, a, bind)) {
	129	ret = tcf_hash_create(tn, index, est, a, sizeof(*ipt), bind,
	130	false);
86062033 WC	131	if (ret)
86062033 WC	132	return ret;
1da177e4 LT	133	ret = ACT_P_CREATED;
1da177e4 LT	134	} else {
1a29321e JHS	135	if (bind)/* dont override defaults */
1a29321e JHS	136	return 0;
a5b5c958	137	tcf_hash_release(a, bind);
1a29321e JHS	138
1a29321e JHS	139	if (!ovr)
1da177e4	140	return -EEXIST;
1da177e4	141	}
86062033	142	ipt = to_ipt(a);
1da177e4	143
1587bac4	144	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
1da177e4 LT	145
	146	err = -ENOMEM;
	147	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	148	if (unlikely(!tname))
1da177e4	149	goto err1;
7ba699c6 PM	150	if (tb[TCA_IPT_TABLE] == NULL \|\|
7ba699c6 PM	151	nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	152	strcpy(tname, "mangle");
1da177e4 LT	153
c7b1b249	154	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	155	if (unlikely(!t))
1da177e4	156	goto err2;
1da177e4	157
cc7ec456 ED	158	err = ipt_init_target(t, tname, hook);
cc7ec456 ED	159	if (err < 0)
1da177e4 LT	160	goto err3;
1da177e4 LT	161
e9ce1cd3	162	spin_lock_bh(&ipt->tcf_lock);
1da177e4	163	if (ret != ACT_P_CREATED) {
e9ce1cd3 DM	164	ipt_destroy_target(ipt->tcfi_t);
	165	kfree(ipt->tcfi_tname);
	166	kfree(ipt->tcfi_t);
1da177e4	167	}
e9ce1cd3 DM	168	ipt->tcfi_tname = tname;
	169	ipt->tcfi_t = t;
	170	ipt->tcfi_hook = hook;
	171	spin_unlock_bh(&ipt->tcf_lock);
1da177e4	172	if (ret == ACT_P_CREATED)
ddf97ccd	173	tcf_hash_insert(tn, a);
1da177e4 LT	174	return ret;
	175
	176	err3:
	177	kfree(t);
	178	err2:
	179	kfree(tname);
	180	err1:
86062033 WC	181	if (ret == ACT_P_CREATED)
86062033 WC	182	tcf_hash_cleanup(a, est);
1da177e4 LT	183	return err;
	184	}
	185
ddf97ccd WC	186	static int tcf_ipt_init(struct net net, struct nlattr nla,
	187	struct nlattr est, struct tc_action a, int ovr,
	188	int bind)
	189	{
	190	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	191
	192	return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
	193	}
	194
	195	static int tcf_xt_init(struct net net, struct nlattr nla,
	196	struct nlattr est, struct tc_action a, int ovr,
	197	int bind)
	198	{
	199	struct tc_action_net *tn = net_generic(net, xt_net_id);
	200
	201	return __tcf_ipt_init(tn, nla, est, a, ovr, bind);
	202	}
	203
dc7f9f6e	204	static int tcf_ipt(struct sk_buff skb, const struct tc_action a,
e9ce1cd3	205	struct tcf_result *res)
1da177e4 LT	206	{
1da177e4 LT	207	int ret = 0, result = 0;
e9ce1cd3	208	struct tcf_ipt *ipt = a->priv;
4b560b44	209	struct xt_action_param par;
1da177e4	210
14bbd6a5 PS	211	if (skb_unclone(skb, GFP_ATOMIC))
14bbd6a5 PS	212	return TC_ACT_UNSPEC;
1da177e4	213
e9ce1cd3	214	spin_lock(&ipt->tcf_lock);
1da177e4	215
9c4a4e48	216	tcf_lastuse_update(&ipt->tcf_tm);
bfe0d029	217	bstats_update(&ipt->tcf_bstats, skb);
1da177e4 LT	218
1da177e4 LT	219	/* yes, we have to worry about both in and out dev
cc7ec456 ED	220	* worry later - danger - this API seems to have changed
	221	* from earlier kernels
	222	*/
156c196f	223	par.net = dev_net(skb->dev);
7eb35586 JE	224	par.in = skb->dev;
	225	par.out = NULL;
	226	par.hooknum = ipt->tcfi_hook;
	227	par.target = ipt->tcfi_t->u.kernel.target;
	228	par.targinfo = ipt->tcfi_t->data;
44ef548f	229	par.family = NFPROTO_IPV4;
7eb35586 JE	230	ret = par.target->target(skb, &par);
7eb35586 JE	231
1da177e4 LT	232	switch (ret) {
	233	case NF_ACCEPT:
	234	result = TC_ACT_OK;
	235	break;
	236	case NF_DROP:
	237	result = TC_ACT_SHOT;
e9ce1cd3	238	ipt->tcf_qstats.drops++;
1da177e4	239	break;
243bf6e2	240	case XT_CONTINUE:
1da177e4 LT	241	result = TC_ACT_PIPE;
	242	break;
	243	default:
e87cc472 JP	244	net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
e87cc472 JP	245	ret);
95df1b16	246	result = TC_ACT_OK;
1da177e4 LT	247	break;
1da177e4 LT	248	}
e9ce1cd3	249	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	250	return result;
	251
	252	}
	253
0b0f43fe JHS	254	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind,
0b0f43fe JHS	255	int ref)
1da177e4	256	{
27a884dc	257	unsigned char *b = skb_tail_pointer(skb);
e9ce1cd3	258	struct tcf_ipt *ipt = a->priv;
87a2e70d	259	struct xt_entry_target *t;
1da177e4 LT	260	struct tcf_t tm;
1da177e4 LT	261	struct tc_cnt c;
1da177e4 LT	262
1da177e4 LT	263	/* for simple targets kernel size == user size
cc7ec456 ED	264	* user name = target name
	265	* for foolproof you need to not assume this
	266	*/
1da177e4	267
c7b1b249	268	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	269	if (unlikely(!t))
7ba699c6	270	goto nla_put_failure;
1da177e4	271
e9ce1cd3 DM	272	c.bindcnt = ipt->tcf_bindcnt - bind;
e9ce1cd3 DM	273	c.refcnt = ipt->tcf_refcnt - ref;
e9ce1cd3 DM	274	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	275
1b34ec43 DM	276	if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) \|\|
	277	nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) \|\|
	278	nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) \|\|
	279	nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) \|\|
	280	nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
	281	goto nla_put_failure;
48d8ee16 JHS	282
48d8ee16 JHS	283	tcf_tm_dump(&tm, &ipt->tcf_tm);
9854518e	284	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
1b34ec43	285	goto nla_put_failure;
48d8ee16	286
1da177e4 LT	287	kfree(t);
	288	return skb->len;
	289
7ba699c6	290	nla_put_failure:
dc5fc579	291	nlmsg_trim(skb, b);
1da177e4 LT	292	kfree(t);
	293	return -1;
	294	}
	295
ddf97ccd WC	296	static int tcf_ipt_walker(struct net net, struct sk_buff skb,
	297	struct netlink_callback *cb, int type,
	298	struct tc_action *a)
	299	{
	300	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	301
	302	return tcf_generic_walker(tn, skb, cb, type, a);
	303	}
	304
	305	static int tcf_ipt_search(struct net net, struct tc_action a, u32 index)
	306	{
	307	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	308
	309	return tcf_hash_search(tn, a, index);
	310	}
	311
1da177e4 LT	312	static struct tc_action_ops act_ipt_ops = {
	313	.kind = "ipt",
	314	.type = TCA_ACT_IPT,
1da177e4 LT	315	.owner = THIS_MODULE,
	316	.act = tcf_ipt,
	317	.dump = tcf_ipt_dump,
86062033	318	.cleanup = tcf_ipt_release,
1da177e4	319	.init = tcf_ipt_init,
ddf97ccd WC	320	.walk = tcf_ipt_walker,
	321	.lookup = tcf_ipt_search,
	322	};
	323
	324	static __net_init int ipt_init_net(struct net *net)
	325	{
	326	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	327
	328	return tc_action_net_init(tn, &act_ipt_ops, IPT_TAB_MASK);
	329	}
	330
	331	static void __net_exit ipt_exit_net(struct net *net)
	332	{
	333	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	334
	335	tc_action_net_exit(tn);
	336	}
	337
	338	static struct pernet_operations ipt_net_ops = {
	339	.init = ipt_init_net,
	340	.exit = ipt_exit_net,
	341	.id = &ipt_net_id,
	342	.size = sizeof(struct tc_action_net),
1da177e4 LT	343	};
1da177e4 LT	344
ddf97ccd WC	345	static int tcf_xt_walker(struct net net, struct sk_buff skb,
	346	struct netlink_callback *cb, int type,
	347	struct tc_action *a)
	348	{
	349	struct tc_action_net *tn = net_generic(net, xt_net_id);
	350
	351	return tcf_generic_walker(tn, skb, cb, type, a);
	352	}
	353
	354	static int tcf_xt_search(struct net net, struct tc_action a, u32 index)
	355	{
	356	struct tc_action_net *tn = net_generic(net, xt_net_id);
	357
	358	return tcf_hash_search(tn, a, index);
	359	}
	360
0dcffd09 JHS	361	static struct tc_action_ops act_xt_ops = {
0dcffd09 JHS	362	.kind = "xt",
6c80563c	363	.type = TCA_ACT_XT,
0dcffd09 JHS	364	.owner = THIS_MODULE,
	365	.act = tcf_ipt,
	366	.dump = tcf_ipt_dump,
86062033	367	.cleanup = tcf_ipt_release,
ddf97ccd WC	368	.init = tcf_xt_init,
	369	.walk = tcf_xt_walker,
	370	.lookup = tcf_xt_search,
	371	};
	372
	373	static __net_init int xt_init_net(struct net *net)
	374	{
	375	struct tc_action_net *tn = net_generic(net, xt_net_id);
	376
	377	return tc_action_net_init(tn, &act_xt_ops, IPT_TAB_MASK);
	378	}
	379
	380	static void __net_exit xt_exit_net(struct net *net)
	381	{
	382	struct tc_action_net *tn = net_generic(net, xt_net_id);
	383
	384	tc_action_net_exit(tn);
	385	}
	386
	387	static struct pernet_operations xt_net_ops = {
	388	.init = xt_init_net,
	389	.exit = xt_exit_net,
	390	.id = &xt_net_id,
	391	.size = sizeof(struct tc_action_net),
0dcffd09 JHS	392	};
	393
	394	MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
1da177e4 LT	395	MODULE_DESCRIPTION("Iptables target actions");
1da177e4 LT	396	MODULE_LICENSE("GPL");
0dcffd09	397	MODULE_ALIAS("act_xt");
1da177e4	398
e9ce1cd3	399	static int __init ipt_init_module(void)
1da177e4	400	{
4f1e9d89	401	int ret1, ret2;
369ba567	402
ddf97ccd	403	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
0dcffd09	404	if (ret1 < 0)
ddf97ccd WC	405	pr_err("Failed to load xt action\n");
	406
	407	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
0dcffd09	408	if (ret2 < 0)
ddf97ccd	409	pr_err("Failed to load ipt action\n");
0dcffd09	410
369ba567	411	if (ret1 < 0 && ret2 < 0) {
0dcffd09	412	return ret1;
369ba567	413	} else
0dcffd09	414	return 0;
1da177e4 LT	415	}
1da177e4 LT	416
e9ce1cd3	417	static void __exit ipt_cleanup_module(void)
1da177e4	418	{
ddf97ccd WC	419	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
ddf97ccd WC	420	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
1da177e4 LT	421	}
	422
	423	module_init(ipt_init_module);
	424	module_exit(ipt_cleanup_module);