[thirdparty/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>


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)
{
	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 tcf_proto *tp)
{
	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]);

	err = tcf_idr_check_alloc(tn, &index, a, bind);
	if (err < 0)
		return err;
	exists = err;
	if (exists && bind)
		return 0;

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

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

		if (!ovr) {
			tcf_idr_release(*a, bind);
			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:
	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, bool rtnl_held, struct tcf_proto *tp,
			struct netlink_ext_ack *extack)
{
	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
			      bind, tp);
}

static int tcf_xt_init(struct net *net, struct nlattr *nla,
		       struct nlattr *est, struct tc_action **a, int ovr,
		       int bind, bool unlocked, struct tcf_proto *tp,
		       struct netlink_ext_ack *extack)
{
	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
			      bind, tp);
}

static int tcf_ipt_act(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
	 */

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

	c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind;
	c.refcnt = refcount_read(&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;

	spin_unlock_bh(&ipt->tcf_lock);
	kfree(t);
	return skb->len;

nla_put_failure:
	spin_unlock_bh(&ipt->tcf_lock);
	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 netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

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

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",
	.id		=	TCA_ID_IPT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_ipt_act,
	.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 list_head *net_list)
{
	tc_action_net_exit(net_list, ipt_net_id);
}

static struct pernet_operations ipt_net_ops = {
	.init = ipt_init_net,
	.exit_batch = 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 netlink_ext_ack *extack)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

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

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",
	.id		=	TCA_ID_XT,
	.owner		=	THIS_MODULE,
	.act		=	tcf_ipt_act,
	.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 list_head *net_list)
{
	tc_action_net_exit(net_list, xt_net_id);
}

static struct pernet_operations xt_net_ops = {
	.init = xt_init_net,
	.exit_batch = 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
9a63b255	80	static void tcf_ipt_release(struct tc_action *a)
1da177e4	81	{
86062033	82	struct tcf_ipt *ipt = to_ipt(a);
1e46ef17 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	99	struct nlattr est, struct tc_action *a,
85d0966f DC	100	const struct tc_action_ops *ops, int ovr, int bind,
85d0966f DC	101	struct tcf_proto *tp)
1da177e4	102	{
ec0acb09	103	struct tc_action_net *tn = net_generic(net, id);
7ba699c6	104	struct nlattr *tb[TCA_IPT_MAX + 1];
e9ce1cd3	105	struct tcf_ipt *ipt;
87a2e70d	106	struct xt_entry_target td, t;
1da177e4	107	char *tname;
b2313077 WC	108	bool exists = false;
b2313077 WC	109	int ret = 0, err;
1da177e4 LT	110	u32 hook = 0;
	111	u32 index = 0;
	112
cee63723	113	if (nla == NULL)
1da177e4 LT	114	return -EINVAL;
1da177e4 LT	115
fceb6435	116	err = nla_parse_nested(tb, TCA_IPT_MAX, nla, ipt_policy, NULL);
cee63723 PM	117	if (err < 0)
	118	return err;
	119
a57f19d3 JHS	120	if (tb[TCA_IPT_INDEX] != NULL)
	121	index = nla_get_u32(tb[TCA_IPT_INDEX]);
	122
0190c1d4 VB	123	err = tcf_idr_check_alloc(tn, &index, a, bind);
	124	if (err < 0)
	125	return err;
	126	exists = err;
a57f19d3 JHS	127	if (exists && bind)
	128	return 0;
	129
	130	if (tb[TCA_IPT_HOOK] == NULL \|\| tb[TCA_IPT_TARG] == NULL) {
	131	if (exists)
65a206c0	132	tcf_idr_release(*a, bind);
0190c1d4 VB	133	else
0190c1d4 VB	134	tcf_idr_cleanup(tn, index);
1da177e4	135	return -EINVAL;
a57f19d3	136	}
53b2bf3f	137
87a2e70d	138	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
aeadd93f	139	if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) {
d15eccea	140	if (exists)
65a206c0	141	tcf_idr_release(*a, bind);
0190c1d4 VB	142	else
0190c1d4 VB	143	tcf_idr_cleanup(tn, index);
1da177e4	144	return -EINVAL;
d15eccea	145	}
1da177e4	146
d15eccea	147	if (!exists) {
65a206c0 CM	148	ret = tcf_idr_create(tn, index, est, a, ops, bind,
65a206c0 CM	149	false);
0190c1d4 VB	150	if (ret) {
0190c1d4 VB	151	tcf_idr_cleanup(tn, index);
86062033	152	return ret;
0190c1d4	153	}
1da177e4 LT	154	ret = ACT_P_CREATED;
1da177e4 LT	155	} else {
1a29321e JHS	156	if (bind)/* dont override defaults */
1a29321e JHS	157	return 0;
1a29321e	158
4e8ddd7f VB	159	if (!ovr) {
4e8ddd7f VB	160	tcf_idr_release(*a, bind);
1da177e4	161	return -EEXIST;
4e8ddd7f	162	}
1da177e4	163	}
1587bac4	164	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
1da177e4 LT	165
	166	err = -ENOMEM;
	167	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	168	if (unlikely(!tname))
1da177e4	169	goto err1;
7ba699c6 PM	170	if (tb[TCA_IPT_TABLE] == NULL \|\|
7ba699c6 PM	171	nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	172	strcpy(tname, "mangle");
1da177e4 LT	173
c7b1b249	174	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	175	if (unlikely(!t))
1da177e4	176	goto err2;
1da177e4	177
ec0acb09	178	err = ipt_init_target(net, t, tname, hook);
cc7ec456	179	if (err < 0)
1da177e4 LT	180	goto err3;
1da177e4 LT	181
a85a970a WC	182	ipt = to_ipt(*a);
a85a970a WC	183
e9ce1cd3	184	spin_lock_bh(&ipt->tcf_lock);
1da177e4	185	if (ret != ACT_P_CREATED) {
e9ce1cd3 DM	186	ipt_destroy_target(ipt->tcfi_t);
	187	kfree(ipt->tcfi_tname);
	188	kfree(ipt->tcfi_t);
1da177e4	189	}
e9ce1cd3 DM	190	ipt->tcfi_tname = tname;
	191	ipt->tcfi_t = t;
	192	ipt->tcfi_hook = hook;
	193	spin_unlock_bh(&ipt->tcf_lock);
1da177e4	194	if (ret == ACT_P_CREATED)
65a206c0	195	tcf_idr_insert(tn, *a);
1da177e4 LT	196	return ret;
	197
	198	err3:
	199	kfree(t);
	200	err2:
	201	kfree(tname);
	202	err1:
8f67c90e	203	tcf_idr_release(*a, bind);
1da177e4 LT	204	return err;
	205	}
	206
ddf97ccd	207	static int tcf_ipt_init(struct net net, struct nlattr nla,
a85a970a	208	struct nlattr est, struct tc_action *a, int ovr,
85d0966f	209	int bind, bool rtnl_held, struct tcf_proto *tp,
789871bb	210	struct netlink_ext_ack *extack)
ddf97ccd	211	{
ec0acb09	212	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
85d0966f	213	bind, tp);
ddf97ccd WC	214	}
	215
	216	static int tcf_xt_init(struct net net, struct nlattr nla,
a85a970a	217	struct nlattr est, struct tc_action *a, int ovr,
85d0966f	218	int bind, bool unlocked, struct tcf_proto *tp,
789871bb	219	struct netlink_ext_ack *extack)
ddf97ccd	220	{
ec0acb09	221	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
85d0966f	222	bind, tp);
ddf97ccd WC	223	}
ddf97ccd WC	224
11b9695b JHS	225	static int tcf_ipt_act(struct sk_buff skb, const struct tc_action a,
11b9695b JHS	226	struct tcf_result *res)
1da177e4 LT	227	{
1da177e4 LT	228	int ret = 0, result = 0;
a85a970a	229	struct tcf_ipt *ipt = to_ipt(a);
4b560b44	230	struct xt_action_param par;
613dbd95 PNA	231	struct nf_hook_state state = {
	232	.net = dev_net(skb->dev),
	233	.in = skb->dev,
	234	.hook = ipt->tcfi_hook,
	235	.pf = NFPROTO_IPV4,
	236	};
1da177e4	237
14bbd6a5 PS	238	if (skb_unclone(skb, GFP_ATOMIC))
14bbd6a5 PS	239	return TC_ACT_UNSPEC;
1da177e4	240
e9ce1cd3	241	spin_lock(&ipt->tcf_lock);
1da177e4	242
9c4a4e48	243	tcf_lastuse_update(&ipt->tcf_tm);
bfe0d029	244	bstats_update(&ipt->tcf_bstats, skb);
1da177e4 LT	245
1da177e4 LT	246	/* yes, we have to worry about both in and out dev
cc7ec456 ED	247	* worry later - danger - this API seems to have changed
	248	* from earlier kernels
	249	*/
613dbd95	250	par.state = &state;
7eb35586 JE	251	par.target = ipt->tcfi_t->u.kernel.target;
	252	par.targinfo = ipt->tcfi_t->data;
	253	ret = par.target->target(skb, &par);
	254
1da177e4 LT	255	switch (ret) {
	256	case NF_ACCEPT:
	257	result = TC_ACT_OK;
	258	break;
	259	case NF_DROP:
	260	result = TC_ACT_SHOT;
e9ce1cd3	261	ipt->tcf_qstats.drops++;
1da177e4	262	break;
243bf6e2	263	case XT_CONTINUE:
1da177e4 LT	264	result = TC_ACT_PIPE;
	265	break;
	266	default:
e87cc472 JP	267	net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
e87cc472 JP	268	ret);
95df1b16	269	result = TC_ACT_OK;
1da177e4 LT	270	break;
1da177e4 LT	271	}
e9ce1cd3	272	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	273	return result;
	274
	275	}
	276
0b0f43fe JHS	277	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind,
0b0f43fe JHS	278	int ref)
1da177e4	279	{
27a884dc	280	unsigned char *b = skb_tail_pointer(skb);
a85a970a	281	struct tcf_ipt *ipt = to_ipt(a);
87a2e70d	282	struct xt_entry_target *t;
1da177e4 LT	283	struct tcf_t tm;
1da177e4 LT	284	struct tc_cnt c;
1da177e4 LT	285
1da177e4 LT	286	/* for simple targets kernel size == user size
cc7ec456 ED	287	* user name = target name
	288	* for foolproof you need to not assume this
	289	*/
1da177e4	290
ff25276d	291	spin_lock_bh(&ipt->tcf_lock);
c7b1b249	292	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	293	if (unlikely(!t))
7ba699c6	294	goto nla_put_failure;
1da177e4	295
036bb443 VB	296	c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind;
036bb443 VB	297	c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref;
e9ce1cd3 DM	298	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	299
1b34ec43 DM	300	if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) \|\|
	301	nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) \|\|
	302	nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) \|\|
	303	nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) \|\|
	304	nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
	305	goto nla_put_failure;
48d8ee16 JHS	306
48d8ee16 JHS	307	tcf_tm_dump(&tm, &ipt->tcf_tm);
9854518e	308	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
1b34ec43	309	goto nla_put_failure;
48d8ee16	310
ff25276d	311	spin_unlock_bh(&ipt->tcf_lock);
1da177e4 LT	312	kfree(t);
	313	return skb->len;
	314
7ba699c6	315	nla_put_failure:
ff25276d	316	spin_unlock_bh(&ipt->tcf_lock);
dc5fc579	317	nlmsg_trim(skb, b);
1da177e4 LT	318	kfree(t);
	319	return -1;
	320	}
	321
ddf97ccd WC	322	static int tcf_ipt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	323	struct netlink_callback *cb, int type,
41780105 AA	324	const struct tc_action_ops *ops,
41780105 AA	325	struct netlink_ext_ack *extack)
ddf97ccd WC	326	{
	327	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	328
b3620145	329	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	330	}
ddf97ccd WC	331
f061b48c	332	static int tcf_ipt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	333	{
	334	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	335
65a206c0	336	return tcf_idr_search(tn, a, index);
ddf97ccd WC	337	}
ddf97ccd WC	338
1da177e4 LT	339	static struct tc_action_ops act_ipt_ops = {
1da177e4 LT	340	.kind = "ipt",
eddd2cf1	341	.id = TCA_ID_IPT,
1da177e4	342	.owner = THIS_MODULE,
11b9695b	343	.act = tcf_ipt_act,
1da177e4	344	.dump = tcf_ipt_dump,
86062033	345	.cleanup = tcf_ipt_release,
1da177e4	346	.init = tcf_ipt_init,
ddf97ccd WC	347	.walk = tcf_ipt_walker,
ddf97ccd WC	348	.lookup = tcf_ipt_search,
a85a970a	349	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	350	};
	351
	352	static __net_init int ipt_init_net(struct net *net)
	353	{
	354	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	355
c7e460ce	356	return tc_action_net_init(tn, &act_ipt_ops);
ddf97ccd WC	357	}
ddf97ccd WC	358
039af9c6	359	static void __net_exit ipt_exit_net(struct list_head *net_list)
ddf97ccd	360	{
039af9c6	361	tc_action_net_exit(net_list, ipt_net_id);
ddf97ccd WC	362	}
	363
	364	static struct pernet_operations ipt_net_ops = {
	365	.init = ipt_init_net,
039af9c6	366	.exit_batch = ipt_exit_net,
ddf97ccd WC	367	.id = &ipt_net_id,
ddf97ccd WC	368	.size = sizeof(struct tc_action_net),
1da177e4 LT	369	};
1da177e4 LT	370
ddf97ccd WC	371	static int tcf_xt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	372	struct netlink_callback *cb, int type,
41780105 AA	373	const struct tc_action_ops *ops,
41780105 AA	374	struct netlink_ext_ack *extack)
ddf97ccd WC	375	{
	376	struct tc_action_net *tn = net_generic(net, xt_net_id);
	377
b3620145	378	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	379	}
ddf97ccd WC	380
f061b48c	381	static int tcf_xt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	382	{
	383	struct tc_action_net *tn = net_generic(net, xt_net_id);
	384
65a206c0	385	return tcf_idr_search(tn, a, index);
ddf97ccd WC	386	}
ddf97ccd WC	387
0dcffd09 JHS	388	static struct tc_action_ops act_xt_ops = {
0dcffd09 JHS	389	.kind = "xt",
eddd2cf1	390	.id = TCA_ID_XT,
0dcffd09	391	.owner = THIS_MODULE,
11b9695b	392	.act = tcf_ipt_act,
0dcffd09	393	.dump = tcf_ipt_dump,
86062033	394	.cleanup = tcf_ipt_release,
ddf97ccd WC	395	.init = tcf_xt_init,
	396	.walk = tcf_xt_walker,
	397	.lookup = tcf_xt_search,
a85a970a	398	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	399	};
	400
	401	static __net_init int xt_init_net(struct net *net)
	402	{
	403	struct tc_action_net *tn = net_generic(net, xt_net_id);
	404
c7e460ce	405	return tc_action_net_init(tn, &act_xt_ops);
ddf97ccd WC	406	}
ddf97ccd WC	407
039af9c6	408	static void __net_exit xt_exit_net(struct list_head *net_list)
ddf97ccd	409	{
039af9c6	410	tc_action_net_exit(net_list, xt_net_id);
ddf97ccd WC	411	}
	412
	413	static struct pernet_operations xt_net_ops = {
	414	.init = xt_init_net,
039af9c6	415	.exit_batch = xt_exit_net,
ddf97ccd WC	416	.id = &xt_net_id,
ddf97ccd WC	417	.size = sizeof(struct tc_action_net),
0dcffd09 JHS	418	};
	419
	420	MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
1da177e4 LT	421	MODULE_DESCRIPTION("Iptables target actions");
1da177e4 LT	422	MODULE_LICENSE("GPL");
0dcffd09	423	MODULE_ALIAS("act_xt");
1da177e4	424
e9ce1cd3	425	static int __init ipt_init_module(void)
1da177e4	426	{
4f1e9d89	427	int ret1, ret2;
369ba567	428
ddf97ccd	429	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
0dcffd09	430	if (ret1 < 0)
ddf97ccd WC	431	pr_err("Failed to load xt action\n");
	432
	433	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
0dcffd09	434	if (ret2 < 0)
ddf97ccd	435	pr_err("Failed to load ipt action\n");
0dcffd09	436
369ba567	437	if (ret1 < 0 && ret2 < 0) {
0dcffd09	438	return ret1;
369ba567	439	} else
0dcffd09	440	return 0;
1da177e4 LT	441	}
1da177e4 LT	442
e9ce1cd3	443	static void __exit ipt_cleanup_module(void)
1da177e4	444	{
ddf97ccd WC	445	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
ddf97ccd WC	446	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
1da177e4 LT	447	}
	448
	449	module_init(ipt_init_module);
	450	module_exit(ipt_cleanup_module);