[mirror_ubuntu-artful-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>


#define IPT_TAB_MASK     15

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);
	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 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_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) {
		if (exists)
			tcf_hash_release(*a, bind);
		return -EINVAL;
	}

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