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

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * net/sched/act_ipt.c		iptables target interface
 *
 *TODO: Add other tables. For now we only support the ipv4 table targets
 *
 * 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 <net/tc_wrapper.h>

#include <linux/netfilter_ipv4/ip_tables.h>


static struct tc_action_ops act_ipt_ops;
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 net *net)
{
	struct xt_tgdtor_param par = {
		.target   = t->u.kernel.target,
		.targinfo = t->data,
		.family   = NFPROTO_IPV4,
		.net      = net,
	};
	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, a->idrinfo->net);
		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,
			  struct tcf_proto *tp, u32 flags)
{
	struct tc_action_net *tn = net_generic(net, id);
	bool bind = flags & TCA_ACT_FLAGS_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_deprecated(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, flags);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else {
		if (bind)/* dont override defaults */
			return 0;

		if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
			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_strscpy(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, net);
		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);
	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,
			struct tcf_proto *tp,
			u32 flags, struct netlink_ext_ack *extack)
{
	return __tcf_ipt_init(net, act_ipt_ops.net_id, nla, est,
			      a, &act_ipt_ops, tp, flags);
}

static int tcf_xt_init(struct net *net, struct nlattr *nla,
		       struct nlattr *est, struct tc_action **a,
		       struct tcf_proto *tp,
		       u32 flags, struct netlink_ext_ack *extack)
{
	return __tcf_ipt_init(net, act_xt_ops.net_id, nla, est,
			      a, &act_xt_ops, tp, flags);
}

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

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

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

static void __net_exit ipt_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, act_ipt_ops.net_id);
}

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

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

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

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

static void __net_exit xt_exit_net(struct list_head *net_list)
{
	tc_action_net_exit(net_list, act_xt_ops.net_id);
}

static struct pernet_operations xt_net_ops = {
	.init = xt_init_net,
	.exit_batch = xt_exit_net,
	.id   = &act_xt_ops.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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
0c6965dd	3	* net/sched/act_ipt.c iptables target interface
1da177e4 LT	4	*
	5	*TODO: Add other tables. For now we only support the ipv4 table targets
	6	*
0dcffd09	7	* Copyright: Jamal Hadi Salim (2002-13)
1da177e4 LT	8	*/
1da177e4 LT	9
1da177e4 LT	10	#include <linux/types.h>
1da177e4 LT	11	#include <linux/kernel.h>
1da177e4	12	#include <linux/string.h>
1da177e4	13	#include <linux/errno.h>
1da177e4 LT	14	#include <linux/skbuff.h>
	15	#include <linux/rtnetlink.h>
	16	#include <linux/module.h>
	17	#include <linux/init.h>
5a0e3ad6	18	#include <linux/slab.h>
dc5fc579	19	#include <net/netlink.h>
1da177e4 LT	20	#include <net/pkt_sched.h>
	21	#include <linux/tc_act/tc_ipt.h>
	22	#include <net/tc_act/tc_ipt.h>
871cf386	23	#include <net/tc_wrapper.h>
1da177e4 LT	24
	25	#include <linux/netfilter_ipv4/ip_tables.h>
	26
1da177e4	27
a85a970a	28	static struct tc_action_ops act_ipt_ops;
a85a970a	29	static struct tc_action_ops act_xt_ops;
ddf97ccd	30
ec0acb09 XL	31	static int ipt_init_target(struct net net, struct xt_entry_target t,
ec0acb09 XL	32	char *table, unsigned int hook)
1da177e4	33	{
af5d6dc2	34	struct xt_tgchk_param par;
e60a13e0	35	struct xt_target *target;
4f8a881a	36	struct ipt_entry e = {};
1da177e4 LT	37	int ret = 0;
1da177e4 LT	38
239a87c8 PM	39	target = xt_request_find_target(AF_INET, t->u.user.name,
239a87c8 PM	40	t->u.user.revision);
d2a7b6ba JE	41	if (IS_ERR(target))
d2a7b6ba JE	42	return PTR_ERR(target);
1da177e4	43
1da177e4	44	t->u.kernel.target = target;
96d97030	45	memset(&par, 0, sizeof(par));
ec0acb09	46	par.net = net;
af5d6dc2	47	par.table = table;
4f8a881a	48	par.entryinfo = &e;
af5d6dc2 JE	49	par.target = target;
	50	par.targinfo = t->data;
	51	par.hook_mask = hook;
916a917d	52	par.family = NFPROTO_IPV4;
1da177e4	53
916a917d	54	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
367c6790	55	if (ret < 0) {
239a87c8	56	module_put(t->u.kernel.target->me);
18118cdb	57	return ret;
239a87c8	58	}
367c6790	59	return 0;
1da177e4 LT	60	}
1da177e4 LT	61
981471bd	62	static void ipt_destroy_target(struct xt_entry_target t, struct net net)
1da177e4	63	{
a2df1648 JE	64	struct xt_tgdtor_param par = {
	65	.target = t->u.kernel.target,
	66	.targinfo = t->data,
44ef548f	67	.family = NFPROTO_IPV4,
981471bd	68	.net = net,
a2df1648 JE	69	};
	70	if (par.target->destroy != NULL)
	71	par.target->destroy(&par);
	72	module_put(par.target->me);
1da177e4 LT	73	}
1da177e4 LT	74
9a63b255	75	static void tcf_ipt_release(struct tc_action *a)
1da177e4	76	{
86062033	77	struct tcf_ipt *ipt = to_ipt(a);
1e46ef17 DC	78
1e46ef17 DC	79	if (ipt->tcfi_t) {
981471bd	80	ipt_destroy_target(ipt->tcfi_t, a->idrinfo->net);
1e46ef17 DC	81	kfree(ipt->tcfi_t);
1e46ef17 DC	82	}
a5b5c958	83	kfree(ipt->tcfi_tname);
1da177e4 LT	84	}
1da177e4 LT	85
53b2bf3f PM	86	static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
	87	[TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
	88	[TCA_IPT_HOOK] = { .type = NLA_U32 },
	89	[TCA_IPT_INDEX] = { .type = NLA_U32 },
87a2e70d	90	[TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
53b2bf3f PM	91	};
53b2bf3f PM	92
ec0acb09	93	static int __tcf_ipt_init(struct net net, unsigned int id, struct nlattr nla,
a85a970a	94	struct nlattr est, struct tc_action *a,
695176bf	95	const struct tc_action_ops *ops,
abbb0d33	96	struct tcf_proto *tp, u32 flags)
1da177e4	97	{
ec0acb09	98	struct tc_action_net *tn = net_generic(net, id);
695176bf	99	bool bind = flags & TCA_ACT_FLAGS_BIND;
7ba699c6	100	struct nlattr *tb[TCA_IPT_MAX + 1];
e9ce1cd3	101	struct tcf_ipt *ipt;
87a2e70d	102	struct xt_entry_target td, t;
1da177e4	103	char *tname;
b2313077 WC	104	bool exists = false;
b2313077 WC	105	int ret = 0, err;
1da177e4 LT	106	u32 hook = 0;
	107	u32 index = 0;
	108
cee63723	109	if (nla == NULL)
1da177e4 LT	110	return -EINVAL;
1da177e4 LT	111
8cb08174 JB	112	err = nla_parse_nested_deprecated(tb, TCA_IPT_MAX, nla, ipt_policy,
8cb08174 JB	113	NULL);
cee63723 PM	114	if (err < 0)
	115	return err;
	116
a57f19d3 JHS	117	if (tb[TCA_IPT_INDEX] != NULL)
	118	index = nla_get_u32(tb[TCA_IPT_INDEX]);
	119
0190c1d4 VB	120	err = tcf_idr_check_alloc(tn, &index, a, bind);
	121	if (err < 0)
	122	return err;
	123	exists = err;
a57f19d3 JHS	124	if (exists && bind)
	125	return 0;
	126
	127	if (tb[TCA_IPT_HOOK] == NULL \|\| tb[TCA_IPT_TARG] == NULL) {
	128	if (exists)
65a206c0	129	tcf_idr_release(*a, bind);
0190c1d4 VB	130	else
0190c1d4 VB	131	tcf_idr_cleanup(tn, index);
1da177e4	132	return -EINVAL;
a57f19d3	133	}
53b2bf3f	134
87a2e70d	135	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
aeadd93f	136	if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) {
d15eccea	137	if (exists)
65a206c0	138	tcf_idr_release(*a, bind);
0190c1d4 VB	139	else
0190c1d4 VB	140	tcf_idr_cleanup(tn, index);
1da177e4	141	return -EINVAL;
d15eccea	142	}
1da177e4	143
d15eccea	144	if (!exists) {
65a206c0	145	ret = tcf_idr_create(tn, index, est, a, ops, bind,
40bd094d	146	false, flags);
0190c1d4 VB	147	if (ret) {
0190c1d4 VB	148	tcf_idr_cleanup(tn, index);
86062033	149	return ret;
0190c1d4	150	}
1da177e4 LT	151	ret = ACT_P_CREATED;
1da177e4 LT	152	} else {
1a29321e JHS	153	if (bind)/* dont override defaults */
1a29321e JHS	154	return 0;
1a29321e	155
695176bf	156	if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
4e8ddd7f	157	tcf_idr_release(*a, bind);
1da177e4	158	return -EEXIST;
4e8ddd7f	159	}
1da177e4	160	}
1587bac4	161	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
1da177e4 LT	162
	163	err = -ENOMEM;
	164	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	165	if (unlikely(!tname))
1da177e4	166	goto err1;
7ba699c6	167	if (tb[TCA_IPT_TABLE] == NULL \|\|
872f6903	168	nla_strscpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	169	strcpy(tname, "mangle");
1da177e4 LT	170
c7b1b249	171	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	172	if (unlikely(!t))
1da177e4	173	goto err2;
1da177e4	174
ec0acb09	175	err = ipt_init_target(net, t, tname, hook);
cc7ec456	176	if (err < 0)
1da177e4 LT	177	goto err3;
1da177e4 LT	178
a85a970a WC	179	ipt = to_ipt(*a);
a85a970a WC	180
e9ce1cd3	181	spin_lock_bh(&ipt->tcf_lock);
1da177e4	182	if (ret != ACT_P_CREATED) {
981471bd	183	ipt_destroy_target(ipt->tcfi_t, net);
e9ce1cd3 DM	184	kfree(ipt->tcfi_tname);
e9ce1cd3 DM	185	kfree(ipt->tcfi_t);
1da177e4	186	}
e9ce1cd3 DM	187	ipt->tcfi_tname = tname;
	188	ipt->tcfi_t = t;
	189	ipt->tcfi_hook = hook;
	190	spin_unlock_bh(&ipt->tcf_lock);
1da177e4 LT	191	return ret;
	192
	193	err3:
	194	kfree(t);
	195	err2:
	196	kfree(tname);
	197	err1:
8f67c90e	198	tcf_idr_release(*a, bind);
1da177e4 LT	199	return err;
	200	}
	201
ddf97ccd	202	static int tcf_ipt_init(struct net net, struct nlattr nla,
695176bf CW	203	struct nlattr est, struct tc_action *a,
695176bf CW	204	struct tcf_proto *tp,
abbb0d33	205	u32 flags, struct netlink_ext_ack *extack)
ddf97ccd	206	{
acd0a7ab ZS	207	return __tcf_ipt_init(net, act_ipt_ops.net_id, nla, est,
acd0a7ab ZS	208	a, &act_ipt_ops, tp, flags);
ddf97ccd WC	209	}
	210
	211	static int tcf_xt_init(struct net net, struct nlattr nla,
695176bf CW	212	struct nlattr est, struct tc_action *a,
695176bf CW	213	struct tcf_proto *tp,
abbb0d33	214	u32 flags, struct netlink_ext_ack *extack)
ddf97ccd	215	{
acd0a7ab ZS	216	return __tcf_ipt_init(net, act_xt_ops.net_id, nla, est,
acd0a7ab ZS	217	a, &act_xt_ops, tp, flags);
ddf97ccd WC	218	}
ddf97ccd WC	219
871cf386 PT	220	TC_INDIRECT_SCOPE int tcf_ipt_act(struct sk_buff *skb,
	221	const struct tc_action *a,
	222	struct tcf_result *res)
1da177e4 LT	223	{
1da177e4 LT	224	int ret = 0, result = 0;
a85a970a	225	struct tcf_ipt *ipt = to_ipt(a);
4b560b44	226	struct xt_action_param par;
613dbd95 PNA	227	struct nf_hook_state state = {
	228	.net = dev_net(skb->dev),
	229	.in = skb->dev,
	230	.hook = ipt->tcfi_hook,
	231	.pf = NFPROTO_IPV4,
	232	};
1da177e4	233
14bbd6a5 PS	234	if (skb_unclone(skb, GFP_ATOMIC))
14bbd6a5 PS	235	return TC_ACT_UNSPEC;
1da177e4	236
e9ce1cd3	237	spin_lock(&ipt->tcf_lock);
1da177e4	238
9c4a4e48	239	tcf_lastuse_update(&ipt->tcf_tm);
bfe0d029	240	bstats_update(&ipt->tcf_bstats, skb);
1da177e4 LT	241
1da177e4 LT	242	/* yes, we have to worry about both in and out dev
cc7ec456 ED	243	* worry later - danger - this API seems to have changed
	244	* from earlier kernels
	245	*/
613dbd95	246	par.state = &state;
7eb35586 JE	247	par.target = ipt->tcfi_t->u.kernel.target;
	248	par.targinfo = ipt->tcfi_t->data;
	249	ret = par.target->target(skb, &par);
	250
1da177e4 LT	251	switch (ret) {
	252	case NF_ACCEPT:
	253	result = TC_ACT_OK;
	254	break;
	255	case NF_DROP:
	256	result = TC_ACT_SHOT;
e9ce1cd3	257	ipt->tcf_qstats.drops++;
1da177e4	258	break;
243bf6e2	259	case XT_CONTINUE:
1da177e4 LT	260	result = TC_ACT_PIPE;
	261	break;
	262	default:
e87cc472 JP	263	net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
e87cc472 JP	264	ret);
95df1b16	265	result = TC_ACT_OK;
1da177e4 LT	266	break;
1da177e4 LT	267	}
e9ce1cd3	268	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	269	return result;
	270
	271	}
	272
0b0f43fe JHS	273	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind,
0b0f43fe JHS	274	int ref)
1da177e4	275	{
27a884dc	276	unsigned char *b = skb_tail_pointer(skb);
a85a970a	277	struct tcf_ipt *ipt = to_ipt(a);
87a2e70d	278	struct xt_entry_target *t;
1da177e4 LT	279	struct tcf_t tm;
1da177e4 LT	280	struct tc_cnt c;
1da177e4 LT	281
1da177e4 LT	282	/* for simple targets kernel size == user size
cc7ec456 ED	283	* user name = target name
	284	* for foolproof you need to not assume this
	285	*/
1da177e4	286
ff25276d	287	spin_lock_bh(&ipt->tcf_lock);
c7b1b249	288	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	289	if (unlikely(!t))
7ba699c6	290	goto nla_put_failure;
1da177e4	291
036bb443 VB	292	c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind;
036bb443 VB	293	c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref;
e9ce1cd3 DM	294	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	295
1b34ec43 DM	296	if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) \|\|
	297	nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) \|\|
	298	nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) \|\|
	299	nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) \|\|
	300	nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
	301	goto nla_put_failure;
48d8ee16 JHS	302
48d8ee16 JHS	303	tcf_tm_dump(&tm, &ipt->tcf_tm);
9854518e	304	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
1b34ec43	305	goto nla_put_failure;
48d8ee16	306
ff25276d	307	spin_unlock_bh(&ipt->tcf_lock);
1da177e4 LT	308	kfree(t);
	309	return skb->len;
	310
7ba699c6	311	nla_put_failure:
ff25276d	312	spin_unlock_bh(&ipt->tcf_lock);
dc5fc579	313	nlmsg_trim(skb, b);
1da177e4 LT	314	kfree(t);
	315	return -1;
	316	}
	317
	318	static struct tc_action_ops act_ipt_ops = {
	319	.kind = "ipt",
eddd2cf1	320	.id = TCA_ID_IPT,
1da177e4	321	.owner = THIS_MODULE,
11b9695b	322	.act = tcf_ipt_act,
1da177e4	323	.dump = tcf_ipt_dump,
86062033	324	.cleanup = tcf_ipt_release,
1da177e4	325	.init = tcf_ipt_init,
a85a970a	326	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	327	};
	328
	329	static __net_init int ipt_init_net(struct net *net)
	330	{
acd0a7ab	331	struct tc_action_net *tn = net_generic(net, act_ipt_ops.net_id);
ddf97ccd	332
981471bd	333	return tc_action_net_init(net, tn, &act_ipt_ops);
ddf97ccd WC	334	}
ddf97ccd WC	335
039af9c6	336	static void __net_exit ipt_exit_net(struct list_head *net_list)
ddf97ccd	337	{
acd0a7ab	338	tc_action_net_exit(net_list, act_ipt_ops.net_id);
ddf97ccd WC	339	}
	340
	341	static struct pernet_operations ipt_net_ops = {
	342	.init = ipt_init_net,
039af9c6	343	.exit_batch = ipt_exit_net,
acd0a7ab	344	.id = &act_ipt_ops.net_id,
ddf97ccd	345	.size = sizeof(struct tc_action_net),
1da177e4 LT	346	};
1da177e4 LT	347
0dcffd09 JHS	348	static struct tc_action_ops act_xt_ops = {
0dcffd09 JHS	349	.kind = "xt",
eddd2cf1	350	.id = TCA_ID_XT,
0dcffd09	351	.owner = THIS_MODULE,
11b9695b	352	.act = tcf_ipt_act,
0dcffd09	353	.dump = tcf_ipt_dump,
86062033	354	.cleanup = tcf_ipt_release,
ddf97ccd	355	.init = tcf_xt_init,
a85a970a	356	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	357	};
	358
	359	static __net_init int xt_init_net(struct net *net)
	360	{
acd0a7ab	361	struct tc_action_net *tn = net_generic(net, act_xt_ops.net_id);
ddf97ccd	362
981471bd	363	return tc_action_net_init(net, tn, &act_xt_ops);
ddf97ccd WC	364	}
ddf97ccd WC	365
039af9c6	366	static void __net_exit xt_exit_net(struct list_head *net_list)
ddf97ccd	367	{
acd0a7ab	368	tc_action_net_exit(net_list, act_xt_ops.net_id);
ddf97ccd WC	369	}
	370
	371	static struct pernet_operations xt_net_ops = {
	372	.init = xt_init_net,
039af9c6	373	.exit_batch = xt_exit_net,
acd0a7ab	374	.id = &act_xt_ops.net_id,
ddf97ccd	375	.size = sizeof(struct tc_action_net),
0dcffd09 JHS	376	};
	377
	378	MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
1da177e4 LT	379	MODULE_DESCRIPTION("Iptables target actions");
1da177e4 LT	380	MODULE_LICENSE("GPL");
0dcffd09	381	MODULE_ALIAS("act_xt");
1da177e4	382
e9ce1cd3	383	static int __init ipt_init_module(void)
1da177e4	384	{
4f1e9d89	385	int ret1, ret2;
369ba567	386
ddf97ccd	387	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
0dcffd09	388	if (ret1 < 0)
ddf97ccd WC	389	pr_err("Failed to load xt action\n");
	390
	391	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
0dcffd09	392	if (ret2 < 0)
ddf97ccd	393	pr_err("Failed to load ipt action\n");
0dcffd09	394
369ba567	395	if (ret1 < 0 && ret2 < 0) {
0dcffd09	396	return ret1;
369ba567	397	} else
0dcffd09	398	return 0;
1da177e4 LT	399	}
1da177e4 LT	400
e9ce1cd3	401	static void __exit ipt_cleanup_module(void)
1da177e4	402	{
ddf97ccd WC	403	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
ddf97ccd WC	404	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
1da177e4 LT	405	}
	406
	407	module_init(ipt_init_module);
	408	module_exit(ipt_cleanup_module);