[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 <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 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, ipt_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, xt_net_id, nla, est, a, &act_xt_ops,
			      tp, flags);
}

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(net, 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(net, 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
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>
	23
	24	#include <linux/netfilter_ipv4/ip_tables.h>
	25
1da177e4	26
c7d03a00	27	static unsigned int ipt_net_id;
a85a970a	28	static struct tc_action_ops act_ipt_ops;
ddf97ccd	29
c7d03a00	30	static unsigned int xt_net_id;
a85a970a	31	static struct tc_action_ops act_xt_ops;
ddf97ccd	32
ec0acb09 XL	33	static int ipt_init_target(struct net net, struct xt_entry_target t,
ec0acb09 XL	34	char *table, unsigned int hook)
1da177e4	35	{
af5d6dc2	36	struct xt_tgchk_param par;
e60a13e0	37	struct xt_target *target;
4f8a881a	38	struct ipt_entry e = {};
1da177e4 LT	39	int ret = 0;
1da177e4 LT	40
239a87c8 PM	41	target = xt_request_find_target(AF_INET, t->u.user.name,
239a87c8 PM	42	t->u.user.revision);
d2a7b6ba JE	43	if (IS_ERR(target))
d2a7b6ba JE	44	return PTR_ERR(target);
1da177e4	45
1da177e4	46	t->u.kernel.target = target;
96d97030	47	memset(&par, 0, sizeof(par));
ec0acb09	48	par.net = net;
af5d6dc2	49	par.table = table;
4f8a881a	50	par.entryinfo = &e;
af5d6dc2 JE	51	par.target = target;
	52	par.targinfo = t->data;
	53	par.hook_mask = hook;
916a917d	54	par.family = NFPROTO_IPV4;
1da177e4	55
916a917d	56	ret = xt_check_target(&par, t->u.target_size - sizeof(*t), 0, false);
367c6790	57	if (ret < 0) {
239a87c8	58	module_put(t->u.kernel.target->me);
18118cdb	59	return ret;
239a87c8	60	}
367c6790	61	return 0;
1da177e4 LT	62	}
1da177e4 LT	63
981471bd	64	static void ipt_destroy_target(struct xt_entry_target t, struct net net)
1da177e4	65	{
a2df1648 JE	66	struct xt_tgdtor_param par = {
	67	.target = t->u.kernel.target,
	68	.targinfo = t->data,
44ef548f	69	.family = NFPROTO_IPV4,
981471bd	70	.net = net,
a2df1648 JE	71	};
	72	if (par.target->destroy != NULL)
	73	par.target->destroy(&par);
	74	module_put(par.target->me);
1da177e4 LT	75	}
1da177e4 LT	76
9a63b255	77	static void tcf_ipt_release(struct tc_action *a)
1da177e4	78	{
86062033	79	struct tcf_ipt *ipt = to_ipt(a);
1e46ef17 DC	80
1e46ef17 DC	81	if (ipt->tcfi_t) {
981471bd	82	ipt_destroy_target(ipt->tcfi_t, a->idrinfo->net);
1e46ef17 DC	83	kfree(ipt->tcfi_t);
1e46ef17 DC	84	}
a5b5c958	85	kfree(ipt->tcfi_tname);
1da177e4 LT	86	}
1da177e4 LT	87
53b2bf3f PM	88	static const struct nla_policy ipt_policy[TCA_IPT_MAX + 1] = {
	89	[TCA_IPT_TABLE] = { .type = NLA_STRING, .len = IFNAMSIZ },
	90	[TCA_IPT_HOOK] = { .type = NLA_U32 },
	91	[TCA_IPT_INDEX] = { .type = NLA_U32 },
87a2e70d	92	[TCA_IPT_TARG] = { .len = sizeof(struct xt_entry_target) },
53b2bf3f PM	93	};
53b2bf3f PM	94
ec0acb09	95	static int __tcf_ipt_init(struct net net, unsigned int id, struct nlattr nla,
a85a970a	96	struct nlattr est, struct tc_action *a,
695176bf	97	const struct tc_action_ops *ops,
abbb0d33	98	struct tcf_proto *tp, u32 flags)
1da177e4	99	{
ec0acb09	100	struct tc_action_net *tn = net_generic(net, id);
695176bf	101	bool bind = flags & TCA_ACT_FLAGS_BIND;
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
8cb08174 JB	114	err = nla_parse_nested_deprecated(tb, TCA_IPT_MAX, nla, ipt_policy,
8cb08174 JB	115	NULL);
cee63723 PM	116	if (err < 0)
	117	return err;
	118
a57f19d3 JHS	119	if (tb[TCA_IPT_INDEX] != NULL)
	120	index = nla_get_u32(tb[TCA_IPT_INDEX]);
	121
0190c1d4 VB	122	err = tcf_idr_check_alloc(tn, &index, a, bind);
	123	if (err < 0)
	124	return err;
	125	exists = err;
a57f19d3 JHS	126	if (exists && bind)
	127	return 0;
	128
	129	if (tb[TCA_IPT_HOOK] == NULL \|\| tb[TCA_IPT_TARG] == NULL) {
	130	if (exists)
65a206c0	131	tcf_idr_release(*a, bind);
0190c1d4 VB	132	else
0190c1d4 VB	133	tcf_idr_cleanup(tn, index);
1da177e4	134	return -EINVAL;
a57f19d3	135	}
53b2bf3f	136
87a2e70d	137	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
aeadd93f	138	if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) {
d15eccea	139	if (exists)
65a206c0	140	tcf_idr_release(*a, bind);
0190c1d4 VB	141	else
0190c1d4 VB	142	tcf_idr_cleanup(tn, index);
1da177e4	143	return -EINVAL;
d15eccea	144	}
1da177e4	145
d15eccea	146	if (!exists) {
65a206c0	147	ret = tcf_idr_create(tn, index, est, a, ops, bind,
40bd094d	148	false, flags);
0190c1d4 VB	149	if (ret) {
0190c1d4 VB	150	tcf_idr_cleanup(tn, index);
86062033	151	return ret;
0190c1d4	152	}
1da177e4 LT	153	ret = ACT_P_CREATED;
1da177e4 LT	154	} else {
1a29321e JHS	155	if (bind)/* dont override defaults */
1a29321e JHS	156	return 0;
1a29321e	157
695176bf	158	if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
4e8ddd7f	159	tcf_idr_release(*a, bind);
1da177e4	160	return -EEXIST;
4e8ddd7f	161	}
1da177e4	162	}
1587bac4	163	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
1da177e4 LT	164
	165	err = -ENOMEM;
	166	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	167	if (unlikely(!tname))
1da177e4	168	goto err1;
7ba699c6	169	if (tb[TCA_IPT_TABLE] == NULL \|\|
872f6903	170	nla_strscpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	171	strcpy(tname, "mangle");
1da177e4 LT	172
c7b1b249	173	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	174	if (unlikely(!t))
1da177e4	175	goto err2;
1da177e4	176
ec0acb09	177	err = ipt_init_target(net, t, tname, hook);
cc7ec456	178	if (err < 0)
1da177e4 LT	179	goto err3;
1da177e4 LT	180
a85a970a WC	181	ipt = to_ipt(*a);
a85a970a WC	182
e9ce1cd3	183	spin_lock_bh(&ipt->tcf_lock);
1da177e4	184	if (ret != ACT_P_CREATED) {
981471bd	185	ipt_destroy_target(ipt->tcfi_t, net);
e9ce1cd3 DM	186	kfree(ipt->tcfi_tname);
e9ce1cd3 DM	187	kfree(ipt->tcfi_t);
1da177e4	188	}
e9ce1cd3 DM	189	ipt->tcfi_tname = tname;
	190	ipt->tcfi_t = t;
	191	ipt->tcfi_hook = hook;
	192	spin_unlock_bh(&ipt->tcf_lock);
1da177e4 LT	193	return ret;
	194
	195	err3:
	196	kfree(t);
	197	err2:
	198	kfree(tname);
	199	err1:
8f67c90e	200	tcf_idr_release(*a, bind);
1da177e4 LT	201	return err;
	202	}
	203
ddf97ccd	204	static int tcf_ipt_init(struct net net, struct nlattr nla,
695176bf CW	205	struct nlattr est, struct tc_action *a,
695176bf CW	206	struct tcf_proto *tp,
abbb0d33	207	u32 flags, struct netlink_ext_ack *extack)
ddf97ccd	208	{
695176bf CW	209	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops,
695176bf CW	210	tp, flags);
ddf97ccd WC	211	}
	212
	213	static int tcf_xt_init(struct net net, struct nlattr nla,
695176bf CW	214	struct nlattr est, struct tc_action *a,
695176bf CW	215	struct tcf_proto *tp,
abbb0d33	216	u32 flags, struct netlink_ext_ack *extack)
ddf97ccd	217	{
695176bf CW	218	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops,
695176bf CW	219	tp, flags);
ddf97ccd WC	220	}
ddf97ccd WC	221
11b9695b JHS	222	static int tcf_ipt_act(struct sk_buff skb, const struct tc_action a,
11b9695b JHS	223	struct tcf_result *res)
1da177e4 LT	224	{
1da177e4 LT	225	int ret = 0, result = 0;
a85a970a	226	struct tcf_ipt *ipt = to_ipt(a);
4b560b44	227	struct xt_action_param par;
613dbd95 PNA	228	struct nf_hook_state state = {
	229	.net = dev_net(skb->dev),
	230	.in = skb->dev,
	231	.hook = ipt->tcfi_hook,
	232	.pf = NFPROTO_IPV4,
	233	};
1da177e4	234
14bbd6a5 PS	235	if (skb_unclone(skb, GFP_ATOMIC))
14bbd6a5 PS	236	return TC_ACT_UNSPEC;
1da177e4	237
e9ce1cd3	238	spin_lock(&ipt->tcf_lock);
1da177e4	239
9c4a4e48	240	tcf_lastuse_update(&ipt->tcf_tm);
bfe0d029	241	bstats_update(&ipt->tcf_bstats, skb);
1da177e4 LT	242
1da177e4 LT	243	/* yes, we have to worry about both in and out dev
cc7ec456 ED	244	* worry later - danger - this API seems to have changed
	245	* from earlier kernels
	246	*/
613dbd95	247	par.state = &state;
7eb35586 JE	248	par.target = ipt->tcfi_t->u.kernel.target;
	249	par.targinfo = ipt->tcfi_t->data;
	250	ret = par.target->target(skb, &par);
	251
1da177e4 LT	252	switch (ret) {
	253	case NF_ACCEPT:
	254	result = TC_ACT_OK;
	255	break;
	256	case NF_DROP:
	257	result = TC_ACT_SHOT;
e9ce1cd3	258	ipt->tcf_qstats.drops++;
1da177e4	259	break;
243bf6e2	260	case XT_CONTINUE:
1da177e4 LT	261	result = TC_ACT_PIPE;
	262	break;
	263	default:
e87cc472 JP	264	net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
e87cc472 JP	265	ret);
95df1b16	266	result = TC_ACT_OK;
1da177e4 LT	267	break;
1da177e4 LT	268	}
e9ce1cd3	269	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	270	return result;
	271
	272	}
	273
0b0f43fe JHS	274	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind,
0b0f43fe JHS	275	int ref)
1da177e4	276	{
27a884dc	277	unsigned char *b = skb_tail_pointer(skb);
a85a970a	278	struct tcf_ipt *ipt = to_ipt(a);
87a2e70d	279	struct xt_entry_target *t;
1da177e4 LT	280	struct tcf_t tm;
1da177e4 LT	281	struct tc_cnt c;
1da177e4 LT	282
1da177e4 LT	283	/* for simple targets kernel size == user size
cc7ec456 ED	284	* user name = target name
	285	* for foolproof you need to not assume this
	286	*/
1da177e4	287
ff25276d	288	spin_lock_bh(&ipt->tcf_lock);
c7b1b249	289	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	290	if (unlikely(!t))
7ba699c6	291	goto nla_put_failure;
1da177e4	292
036bb443 VB	293	c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind;
036bb443 VB	294	c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref;
e9ce1cd3 DM	295	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	296
1b34ec43 DM	297	if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) \|\|
	298	nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) \|\|
	299	nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) \|\|
	300	nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) \|\|
	301	nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
	302	goto nla_put_failure;
48d8ee16 JHS	303
48d8ee16 JHS	304	tcf_tm_dump(&tm, &ipt->tcf_tm);
9854518e	305	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
1b34ec43	306	goto nla_put_failure;
48d8ee16	307
ff25276d	308	spin_unlock_bh(&ipt->tcf_lock);
1da177e4 LT	309	kfree(t);
	310	return skb->len;
	311
7ba699c6	312	nla_put_failure:
ff25276d	313	spin_unlock_bh(&ipt->tcf_lock);
dc5fc579	314	nlmsg_trim(skb, b);
1da177e4 LT	315	kfree(t);
	316	return -1;
	317	}
	318
ddf97ccd WC	319	static int tcf_ipt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	320	struct netlink_callback *cb, int type,
41780105 AA	321	const struct tc_action_ops *ops,
41780105 AA	322	struct netlink_ext_ack *extack)
ddf97ccd WC	323	{
	324	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	325
b3620145	326	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	327	}
ddf97ccd WC	328
f061b48c	329	static int tcf_ipt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	330	{
	331	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	332
65a206c0	333	return tcf_idr_search(tn, a, index);
ddf97ccd WC	334	}
ddf97ccd WC	335
1da177e4 LT	336	static struct tc_action_ops act_ipt_ops = {
1da177e4 LT	337	.kind = "ipt",
eddd2cf1	338	.id = TCA_ID_IPT,
1da177e4	339	.owner = THIS_MODULE,
11b9695b	340	.act = tcf_ipt_act,
1da177e4	341	.dump = tcf_ipt_dump,
86062033	342	.cleanup = tcf_ipt_release,
1da177e4	343	.init = tcf_ipt_init,
ddf97ccd WC	344	.walk = tcf_ipt_walker,
ddf97ccd WC	345	.lookup = tcf_ipt_search,
a85a970a	346	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	347	};
	348
	349	static __net_init int ipt_init_net(struct net *net)
	350	{
	351	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	352
981471bd	353	return tc_action_net_init(net, tn, &act_ipt_ops);
ddf97ccd WC	354	}
ddf97ccd WC	355
039af9c6	356	static void __net_exit ipt_exit_net(struct list_head *net_list)
ddf97ccd	357	{
039af9c6	358	tc_action_net_exit(net_list, ipt_net_id);
ddf97ccd WC	359	}
	360
	361	static struct pernet_operations ipt_net_ops = {
	362	.init = ipt_init_net,
039af9c6	363	.exit_batch = ipt_exit_net,
ddf97ccd WC	364	.id = &ipt_net_id,
ddf97ccd WC	365	.size = sizeof(struct tc_action_net),
1da177e4 LT	366	};
1da177e4 LT	367
ddf97ccd WC	368	static int tcf_xt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	369	struct netlink_callback *cb, int type,
41780105 AA	370	const struct tc_action_ops *ops,
41780105 AA	371	struct netlink_ext_ack *extack)
ddf97ccd WC	372	{
	373	struct tc_action_net *tn = net_generic(net, xt_net_id);
	374
b3620145	375	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	376	}
ddf97ccd WC	377
f061b48c	378	static int tcf_xt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	379	{
	380	struct tc_action_net *tn = net_generic(net, xt_net_id);
	381
65a206c0	382	return tcf_idr_search(tn, a, index);
ddf97ccd WC	383	}
ddf97ccd WC	384
0dcffd09 JHS	385	static struct tc_action_ops act_xt_ops = {
0dcffd09 JHS	386	.kind = "xt",
eddd2cf1	387	.id = TCA_ID_XT,
0dcffd09	388	.owner = THIS_MODULE,
11b9695b	389	.act = tcf_ipt_act,
0dcffd09	390	.dump = tcf_ipt_dump,
86062033	391	.cleanup = tcf_ipt_release,
ddf97ccd WC	392	.init = tcf_xt_init,
	393	.walk = tcf_xt_walker,
	394	.lookup = tcf_xt_search,
a85a970a	395	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	396	};
	397
	398	static __net_init int xt_init_net(struct net *net)
	399	{
	400	struct tc_action_net *tn = net_generic(net, xt_net_id);
	401
981471bd	402	return tc_action_net_init(net, tn, &act_xt_ops);
ddf97ccd WC	403	}
ddf97ccd WC	404
039af9c6	405	static void __net_exit xt_exit_net(struct list_head *net_list)
ddf97ccd	406	{
039af9c6	407	tc_action_net_exit(net_list, xt_net_id);
ddf97ccd WC	408	}
	409
	410	static struct pernet_operations xt_net_ops = {
	411	.init = xt_init_net,
039af9c6	412	.exit_batch = xt_exit_net,
ddf97ccd WC	413	.id = &xt_net_id,
ddf97ccd WC	414	.size = sizeof(struct tc_action_net),
0dcffd09 JHS	415	};
	416
	417	MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
1da177e4 LT	418	MODULE_DESCRIPTION("Iptables target actions");
1da177e4 LT	419	MODULE_LICENSE("GPL");
0dcffd09	420	MODULE_ALIAS("act_xt");
1da177e4	421
e9ce1cd3	422	static int __init ipt_init_module(void)
1da177e4	423	{
4f1e9d89	424	int ret1, ret2;
369ba567	425
ddf97ccd	426	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
0dcffd09	427	if (ret1 < 0)
ddf97ccd WC	428	pr_err("Failed to load xt action\n");
	429
	430	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
0dcffd09	431	if (ret2 < 0)
ddf97ccd	432	pr_err("Failed to load ipt action\n");
0dcffd09	433
369ba567	434	if (ret1 < 0 && ret2 < 0) {
0dcffd09	435	return ret1;
369ba567	436	} else
0dcffd09	437	return 0;
1da177e4 LT	438	}
1da177e4 LT	439
e9ce1cd3	440	static void __exit ipt_cleanup_module(void)
1da177e4	441	{
ddf97ccd WC	442	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
ddf97ccd WC	443	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
1da177e4 LT	444	}
	445
	446	module_init(ipt_init_module);
	447	module_exit(ipt_cleanup_module);