[mirror_ubuntu-bionic-kernel.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>


static unsigned int ipt_net_id;
static struct tc_action_ops act_ipt_ops;

static unsigned int xt_net_id;
static struct tc_action_ops act_xt_ops;

static int ipt_init_target(struct net *net, struct xt_entry_target *t,
			   char *table, unsigned int hook)
{
	struct xt_tgchk_param par;
	struct xt_target *target;
	struct ipt_entry e = {};
	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;
	memset(&par, 0, sizeof(par));
	par.net       = net;
	par.table     = table;
	par.entryinfo = &e;
	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);

	if (ipt->tcfi_t) {
		ipt_destroy_target(ipt->tcfi_t);
		kfree(ipt->tcfi_t);
	}
	kfree(ipt->tcfi_tname);
}

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 net *net, unsigned int id, struct nlattr *nla,
			  struct nlattr *est, struct tc_action **a,
			  const struct tc_action_ops *ops, int ovr, int bind)
{
	struct tc_action_net *tn = net_generic(net, id);
	struct nlattr *tb[TCA_IPT_MAX + 1];
	struct tcf_ipt *ipt;
	struct xt_entry_target *td, *t;
	char *tname;
	bool exists = false;
	int ret = 0, err;
	u32 hook = 0;
	u32 index = 0;

	if (nla == NULL)
		return -EINVAL;

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

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

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

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

	if (!exists) {
		ret = tcf_idr_create(tn, index, est, a, ops, bind,
				     false);
		if (ret)
			return ret;
		ret = ACT_P_CREATED;
	} else {
		if (bind)/* dont override defaults */
			return 0;
		tcf_idr_release(*a, bind);

		if (!ovr)
			return -EEXIST;
	}
	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(net, t, tname, hook);
	if (err < 0)
		goto err3;

	ipt = to_ipt(*a);

	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_idr_insert(tn, *a);
	return ret;

err3:
	kfree(t);
err2:
	kfree(tname);
err1:
	if (ret == ACT_P_CREATED)
		tcf_idr_release(*a, bind);
	return err;
}

static int tcf_ipt_init(struct net *net, struct nlattr *nla,
			struct nlattr *est, struct tc_action **a, int ovr,
			int bind)
{
	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
			      bind);
}

static int tcf_xt_init(struct net *net, struct nlattr *nla,
		       struct nlattr *est, struct tc_action **a, int ovr,
		       int bind)
{
	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, 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 = to_ipt(a);
	struct xt_action_param par;
	struct nf_hook_state state = {
		.net	= dev_net(skb->dev),
		.in	= skb->dev,
		.hook	= ipt->tcfi_hook,
		.pf	= NFPROTO_IPV4,
	};

	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.state    = &state;
	par.target   = ipt->tcfi_t->u.kernel.target;
	par.targinfo = ipt->tcfi_t->data;
	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 = to_ipt(a);
	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,
			  const struct tc_action_ops *ops)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

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

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_idr_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,
	.size		=	sizeof(struct tcf_ipt),
};

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);
}

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,
			 const struct tc_action_ops *ops)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

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

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_idr_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,
	.size		=	sizeof(struct tcf_ipt),
};

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);
}

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
c7d03a00	31	static unsigned int ipt_net_id;
a85a970a	32	static struct tc_action_ops act_ipt_ops;
ddf97ccd	33
c7d03a00	34	static unsigned int xt_net_id;
a85a970a	35	static struct tc_action_ops act_xt_ops;
ddf97ccd	36
ec0acb09 XL	37	static int ipt_init_target(struct net net, struct xt_entry_target t,
ec0acb09 XL	38	char *table, unsigned int hook)
1da177e4	39	{
af5d6dc2	40	struct xt_tgchk_param par;
e60a13e0	41	struct xt_target *target;
4f8a881a	42	struct ipt_entry e = {};
1da177e4 LT	43	int ret = 0;
1da177e4 LT	44
239a87c8 PM	45	target = xt_request_find_target(AF_INET, t->u.user.name,
239a87c8 PM	46	t->u.user.revision);
d2a7b6ba JE	47	if (IS_ERR(target))
d2a7b6ba JE	48	return PTR_ERR(target);
1da177e4	49
1da177e4	50	t->u.kernel.target = target;
96d97030	51	memset(&par, 0, sizeof(par));
ec0acb09	52	par.net = net;
af5d6dc2	53	par.table = table;
4f8a881a	54	par.entryinfo = &e;
af5d6dc2 JE	55	par.target = target;
	56	par.targinfo = t->data;
	57	par.hook_mask = hook;
916a917d	58	par.family = NFPROTO_IPV4;
1da177e4	59
916a917d	60	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
367c6790	61	if (ret < 0) {
239a87c8	62	module_put(t->u.kernel.target->me);
18118cdb	63	return ret;
239a87c8	64	}
367c6790	65	return 0;
1da177e4 LT	66	}
1da177e4 LT	67
87a2e70d	68	static void ipt_destroy_target(struct xt_entry_target *t)
1da177e4	69	{
a2df1648 JE	70	struct xt_tgdtor_param par = {
	71	.target = t->u.kernel.target,
	72	.targinfo = t->data,
44ef548f	73	.family = NFPROTO_IPV4,
a2df1648 JE	74	};
	75	if (par.target->destroy != NULL)
	76	par.target->destroy(&par);
	77	module_put(par.target->me);
1da177e4 LT	78	}
1da177e4 LT	79
a5b5c958	80	static void tcf_ipt_release(struct tc_action *a, int bind)
1da177e4	81	{
86062033	82	struct tcf_ipt *ipt = to_ipt(a);
d31747d1 DC	83
	84	if (ipt->tcfi_t) {
	85	ipt_destroy_target(ipt->tcfi_t);
	86	kfree(ipt->tcfi_t);
	87	}
a5b5c958	88	kfree(ipt->tcfi_tname);
1da177e4 LT	89	}
1da177e4 LT	90
53b2bf3f PM	91	static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
	92	[TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
	93	[TCA_IPT_HOOK] = { .type = NLA_U32 },
	94	[TCA_IPT_INDEX] = { .type = NLA_U32 },
87a2e70d	95	[TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
53b2bf3f PM	96	};
53b2bf3f PM	97
ec0acb09	98	static int __tcf_ipt_init(struct net net, unsigned int id, struct nlattr nla,
a85a970a WC	99	struct nlattr est, struct tc_action *a,
a85a970a WC	100	const struct tc_action_ops *ops, int ovr, int bind)
1da177e4	101	{
ec0acb09	102	struct tc_action_net *tn = net_generic(net, id);
7ba699c6	103	struct nlattr *tb[TCA_IPT_MAX + 1];
e9ce1cd3	104	struct tcf_ipt *ipt;
87a2e70d	105	struct xt_entry_target td, t;
1da177e4	106	char *tname;
b2313077 WC	107	bool exists = false;
b2313077 WC	108	int ret = 0, err;
1da177e4 LT	109	u32 hook = 0;
	110	u32 index = 0;
	111
cee63723	112	if (nla == NULL)
1da177e4 LT	113	return -EINVAL;
1da177e4 LT	114
fceb6435	115	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy, NULL);
cee63723 PM	116	if (err < 0)
	117	return err;
	118
a57f19d3 JHS	119	if (tb[TCA_IPT_INDEX] != NULL)
	120	index = nla_get_u32(tb[TCA_IPT_INDEX]);
	121
65a206c0	122	exists = tcf_idr_check(tn, index, a, bind);
a57f19d3 JHS	123	if (exists && bind)
	124	return 0;
	125
	126	if (tb[TCA_IPT_HOOK] == NULL \|\| tb[TCA_IPT_TARG] == NULL) {
	127	if (exists)
65a206c0	128	tcf_idr_release(*a, bind);
1da177e4	129	return -EINVAL;
a57f19d3	130	}
53b2bf3f	131
87a2e70d	132	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
d15eccea WC	133	if (nla_len(tb[TCA_IPT_TARG]) < td->u.target_size) {
d15eccea WC	134	if (exists)
65a206c0	135	tcf_idr_release(*a, bind);
1da177e4	136	return -EINVAL;
d15eccea	137	}
1da177e4	138
d15eccea	139	if (!exists) {
65a206c0 CM	140	ret = tcf_idr_create(tn, index, est, a, ops, bind,
65a206c0 CM	141	false);
86062033 WC	142	if (ret)
86062033 WC	143	return ret;
1da177e4 LT	144	ret = ACT_P_CREATED;
1da177e4 LT	145	} else {
1a29321e JHS	146	if (bind)/* dont override defaults */
1a29321e JHS	147	return 0;
65a206c0	148	tcf_idr_release(*a, bind);
1a29321e JHS	149
1a29321e JHS	150	if (!ovr)
1da177e4	151	return -EEXIST;
1da177e4	152	}
1587bac4	153	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
1da177e4 LT	154
	155	err = -ENOMEM;
	156	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	157	if (unlikely(!tname))
1da177e4	158	goto err1;
7ba699c6 PM	159	if (tb[TCA_IPT_TABLE] == NULL \|\|
7ba699c6 PM	160	nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	161	strcpy(tname, "mangle");
1da177e4 LT	162
c7b1b249	163	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	164	if (unlikely(!t))
1da177e4	165	goto err2;
1da177e4	166
ec0acb09	167	err = ipt_init_target(net, t, tname, hook);
cc7ec456	168	if (err < 0)
1da177e4 LT	169	goto err3;
1da177e4 LT	170
a85a970a WC	171	ipt = to_ipt(*a);
a85a970a WC	172
e9ce1cd3	173	spin_lock_bh(&ipt->tcf_lock);
1da177e4	174	if (ret != ACT_P_CREATED) {
e9ce1cd3 DM	175	ipt_destroy_target(ipt->tcfi_t);
	176	kfree(ipt->tcfi_tname);
	177	kfree(ipt->tcfi_t);
1da177e4	178	}
e9ce1cd3 DM	179	ipt->tcfi_tname = tname;
	180	ipt->tcfi_t = t;
	181	ipt->tcfi_hook = hook;
	182	spin_unlock_bh(&ipt->tcf_lock);
1da177e4	183	if (ret == ACT_P_CREATED)
65a206c0	184	tcf_idr_insert(tn, *a);
1da177e4 LT	185	return ret;
	186
	187	err3:
	188	kfree(t);
	189	err2:
	190	kfree(tname);
	191	err1:
86062033	192	if (ret == ACT_P_CREATED)
d31747d1	193	tcf_idr_release(*a, bind);
1da177e4 LT	194	return err;
	195	}
	196
ddf97ccd	197	static int tcf_ipt_init(struct net net, struct nlattr nla,
a85a970a	198	struct nlattr est, struct tc_action *a, int ovr,
ddf97ccd WC	199	int bind)
ddf97ccd WC	200	{
ec0acb09 XL	201	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
ec0acb09 XL	202	bind);
ddf97ccd WC	203	}
	204
	205	static int tcf_xt_init(struct net net, struct nlattr nla,
a85a970a	206	struct nlattr est, struct tc_action *a, int ovr,
ddf97ccd WC	207	int bind)
ddf97ccd WC	208	{
ec0acb09 XL	209	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
ec0acb09 XL	210	bind);
ddf97ccd WC	211	}
ddf97ccd WC	212
dc7f9f6e	213	static int tcf_ipt(struct sk_buff skb, const struct tc_action a,
e9ce1cd3	214	struct tcf_result *res)
1da177e4 LT	215	{
1da177e4 LT	216	int ret = 0, result = 0;
a85a970a	217	struct tcf_ipt *ipt = to_ipt(a);
4b560b44	218	struct xt_action_param par;
613dbd95 PNA	219	struct nf_hook_state state = {
	220	.net = dev_net(skb->dev),
	221	.in = skb->dev,
	222	.hook = ipt->tcfi_hook,
	223	.pf = NFPROTO_IPV4,
	224	};
1da177e4	225
14bbd6a5 PS	226	if (skb_unclone(skb, GFP_ATOMIC))
14bbd6a5 PS	227	return TC_ACT_UNSPEC;
1da177e4	228
e9ce1cd3	229	spin_lock(&ipt->tcf_lock);
1da177e4	230
9c4a4e48	231	tcf_lastuse_update(&ipt->tcf_tm);
bfe0d029	232	bstats_update(&ipt->tcf_bstats, skb);
1da177e4 LT	233
1da177e4 LT	234	/* yes, we have to worry about both in and out dev
cc7ec456 ED	235	* worry later - danger - this API seems to have changed
	236	* from earlier kernels
	237	*/
613dbd95	238	par.state = &state;
7eb35586 JE	239	par.target = ipt->tcfi_t->u.kernel.target;
	240	par.targinfo = ipt->tcfi_t->data;
	241	ret = par.target->target(skb, &par);
	242
1da177e4 LT	243	switch (ret) {
	244	case NF_ACCEPT:
	245	result = TC_ACT_OK;
	246	break;
	247	case NF_DROP:
	248	result = TC_ACT_SHOT;
e9ce1cd3	249	ipt->tcf_qstats.drops++;
1da177e4	250	break;
243bf6e2	251	case XT_CONTINUE:
1da177e4 LT	252	result = TC_ACT_PIPE;
	253	break;
	254	default:
e87cc472 JP	255	net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
e87cc472 JP	256	ret);
95df1b16	257	result = TC_ACT_OK;
1da177e4 LT	258	break;
1da177e4 LT	259	}
e9ce1cd3	260	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	261	return result;
	262
	263	}
	264
0b0f43fe JHS	265	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind,
0b0f43fe JHS	266	int ref)
1da177e4	267	{
27a884dc	268	unsigned char *b = skb_tail_pointer(skb);
a85a970a	269	struct tcf_ipt *ipt = to_ipt(a);
87a2e70d	270	struct xt_entry_target *t;
1da177e4 LT	271	struct tcf_t tm;
1da177e4 LT	272	struct tc_cnt c;
1da177e4 LT	273
1da177e4 LT	274	/* for simple targets kernel size == user size
cc7ec456 ED	275	* user name = target name
	276	* for foolproof you need to not assume this
	277	*/
1da177e4	278
c7b1b249	279	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	280	if (unlikely(!t))
7ba699c6	281	goto nla_put_failure;
1da177e4	282
e9ce1cd3 DM	283	c.bindcnt = ipt->tcf_bindcnt - bind;
e9ce1cd3 DM	284	c.refcnt = ipt->tcf_refcnt - ref;
e9ce1cd3 DM	285	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	286
1b34ec43 DM	287	if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) \|\|
	288	nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) \|\|
	289	nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) \|\|
	290	nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) \|\|
	291	nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
	292	goto nla_put_failure;
48d8ee16 JHS	293
48d8ee16 JHS	294	tcf_tm_dump(&tm, &ipt->tcf_tm);
9854518e	295	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
1b34ec43	296	goto nla_put_failure;
48d8ee16	297
1da177e4 LT	298	kfree(t);
	299	return skb->len;
	300
7ba699c6	301	nla_put_failure:
dc5fc579	302	nlmsg_trim(skb, b);
1da177e4 LT	303	kfree(t);
	304	return -1;
	305	}
	306
ddf97ccd WC	307	static int tcf_ipt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	308	struct netlink_callback *cb, int type,
a85a970a	309	const struct tc_action_ops *ops)
ddf97ccd WC	310	{
	311	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	312
a85a970a	313	return tcf_generic_walker(tn, skb, cb, type, ops);
ddf97ccd WC	314	}
ddf97ccd WC	315
a85a970a	316	static int tcf_ipt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	317	{
	318	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	319
65a206c0	320	return tcf_idr_search(tn, a, index);
ddf97ccd WC	321	}
ddf97ccd WC	322
1da177e4 LT	323	static struct tc_action_ops act_ipt_ops = {
	324	.kind = "ipt",
	325	.type = TCA_ACT_IPT,
1da177e4 LT	326	.owner = THIS_MODULE,
	327	.act = tcf_ipt,
	328	.dump = tcf_ipt_dump,
86062033	329	.cleanup = tcf_ipt_release,
1da177e4	330	.init = tcf_ipt_init,
ddf97ccd WC	331	.walk = tcf_ipt_walker,
ddf97ccd WC	332	.lookup = tcf_ipt_search,
a85a970a	333	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	334	};
	335
	336	static __net_init int ipt_init_net(struct net *net)
	337	{
	338	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	339
c7e460ce	340	return tc_action_net_init(tn, &act_ipt_ops);
ddf97ccd WC	341	}
	342
	343	static void __net_exit ipt_exit_net(struct net *net)
	344	{
	345	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	346
	347	tc_action_net_exit(tn);
	348	}
	349
	350	static struct pernet_operations ipt_net_ops = {
	351	.init = ipt_init_net,
	352	.exit = ipt_exit_net,
	353	.id = &ipt_net_id,
	354	.size = sizeof(struct tc_action_net),
1da177e4 LT	355	};
1da177e4 LT	356
ddf97ccd WC	357	static int tcf_xt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	358	struct netlink_callback *cb, int type,
a85a970a	359	const struct tc_action_ops *ops)
ddf97ccd WC	360	{
	361	struct tc_action_net *tn = net_generic(net, xt_net_id);
	362
a85a970a	363	return tcf_generic_walker(tn, skb, cb, type, ops);
ddf97ccd WC	364	}
ddf97ccd WC	365
a85a970a	366	static int tcf_xt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	367	{
	368	struct tc_action_net *tn = net_generic(net, xt_net_id);
	369
65a206c0	370	return tcf_idr_search(tn, a, index);
ddf97ccd WC	371	}
ddf97ccd WC	372
0dcffd09 JHS	373	static struct tc_action_ops act_xt_ops = {
0dcffd09 JHS	374	.kind = "xt",
6c80563c	375	.type = TCA_ACT_XT,
0dcffd09 JHS	376	.owner = THIS_MODULE,
	377	.act = tcf_ipt,
	378	.dump = tcf_ipt_dump,
86062033	379	.cleanup = tcf_ipt_release,
ddf97ccd WC	380	.init = tcf_xt_init,
	381	.walk = tcf_xt_walker,
	382	.lookup = tcf_xt_search,
a85a970a	383	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	384	};
	385
	386	static __net_init int xt_init_net(struct net *net)
	387	{
	388	struct tc_action_net *tn = net_generic(net, xt_net_id);
	389
c7e460ce	390	return tc_action_net_init(tn, &act_xt_ops);
ddf97ccd WC	391	}
	392
	393	static void __net_exit xt_exit_net(struct net *net)
	394	{
	395	struct tc_action_net *tn = net_generic(net, xt_net_id);
	396
	397	tc_action_net_exit(tn);
	398	}
	399
	400	static struct pernet_operations xt_net_ops = {
	401	.init = xt_init_net,
	402	.exit = xt_exit_net,
	403	.id = &xt_net_id,
	404	.size = sizeof(struct tc_action_net),
0dcffd09 JHS	405	};
	406
	407	MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
1da177e4 LT	408	MODULE_DESCRIPTION("Iptables target actions");
1da177e4 LT	409	MODULE_LICENSE("GPL");
0dcffd09	410	MODULE_ALIAS("act_xt");
1da177e4	411
e9ce1cd3	412	static int __init ipt_init_module(void)
1da177e4	413	{
4f1e9d89	414	int ret1, ret2;
369ba567	415
ddf97ccd	416	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
0dcffd09	417	if (ret1 < 0)
ddf97ccd WC	418	pr_err("Failed to load xt action\n");
	419
	420	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
0dcffd09	421	if (ret2 < 0)
ddf97ccd	422	pr_err("Failed to load ipt action\n");
0dcffd09	423
369ba567	424	if (ret1 < 0 && ret2 < 0) {
0dcffd09	425	return ret1;
369ba567	426	} else
0dcffd09	427	return 0;
1da177e4 LT	428	}
1da177e4 LT	429
e9ce1cd3	430	static void __exit ipt_cleanup_module(void)
1da177e4	431	{
ddf97ccd WC	432	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
ddf97ccd WC	433	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
1da177e4 LT	434	}
	435
	436	module_init(ipt_init_module);
	437	module_exit(ipt_cleanup_module);