[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 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 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,
			  const struct tc_action_ops *ops, int ovr, int bind)
{
	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);
	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(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)
{
	struct tc_action_net *tn = net_generic(net, ipt_net_id);

	return __tcf_ipt_init(tn, 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)
{
	struct tc_action_net *tn = net_generic(net, xt_net_id);

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