[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, int ovr, int bind,
			  struct tcf_proto *tp, u32 flags)
{
	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_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, 0);
		if (ret) {
			tcf_idr_cleanup(tn, index);
			return ret;
		}
		ret = ACT_P_CREATED;
	} else {
		if (bind)/* dont override defaults */
			return 0;

		if (!ovr) {
			tcf_idr_release(*a, bind);
			return -EEXIST;
		}
	}
	hook = nla_get_u32(tb[TCA_IPT_HOOK]);

	err = -ENOMEM;
	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
	if (unlikely(!tname))
		goto err1;
	if (tb[TCA_IPT_TABLE] == NULL ||
	    nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
		strcpy(tname, "mangle");

	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
	if (unlikely(!t))
		goto err2;

	err = ipt_init_target(net, t, tname, hook);
	if (err < 0)
		goto err3;

	ipt = to_ipt(*a);

	spin_lock_bh(&ipt->tcf_lock);
	if (ret != ACT_P_CREATED) {
		ipt_destroy_target(ipt->tcfi_t, 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);
	if (ret == ACT_P_CREATED)
		tcf_idr_insert(tn, *a);
	return ret;

err3:
	kfree(t);
err2:
	kfree(tname);
err1:
	tcf_idr_release(*a, bind);
	return err;
}

static int tcf_ipt_init(struct net *net, struct nlattr *nla,
			struct nlattr *est, struct tc_action **a, int ovr,
			int bind, bool rtnl_held, struct tcf_proto *tp,
			u32 flags, struct netlink_ext_ack *extack)
{
	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
			      bind, tp, flags);
}

static int tcf_xt_init(struct net *net, struct nlattr *nla,
		       struct nlattr *est, struct tc_action **a, int ovr,
		       int bind, bool unlocked, struct tcf_proto *tp,
		       u32 flags, struct netlink_ext_ack *extack)
{
	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
			      bind, 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,
85d0966f	97	const struct tc_action_ops *ops, int ovr, int bind,
abbb0d33	98	struct tcf_proto *tp, u32 flags)
1da177e4	99	{
ec0acb09	100	struct tc_action_net *tn = net_generic(net, id);
7ba699c6	101	struct nlattr *tb[TCA_IPT_MAX + 1];
e9ce1cd3	102	struct tcf_ipt *ipt;
87a2e70d	103	struct xt_entry_target td, t;
1da177e4	104	char *tname;
b2313077 WC	105	bool exists = false;
b2313077 WC	106	int ret = 0, err;
1da177e4 LT	107	u32 hook = 0;
	108	u32 index = 0;
	109
cee63723	110	if (nla == NULL)
1da177e4 LT	111	return -EINVAL;
1da177e4 LT	112
8cb08174 JB	113	err = nla_parse_nested_deprecated(tb, TCA_IPT_MAX, nla, ipt_policy,
8cb08174 JB	114	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
0190c1d4 VB	121	err = tcf_idr_check_alloc(tn, &index, a, bind);
	122	if (err < 0)
	123	return err;
	124	exists = err;
a57f19d3 JHS	125	if (exists && bind)
	126	return 0;
	127
	128	if (tb[TCA_IPT_HOOK] == NULL \|\| tb[TCA_IPT_TARG] == NULL) {
	129	if (exists)
65a206c0	130	tcf_idr_release(*a, bind);
0190c1d4 VB	131	else
0190c1d4 VB	132	tcf_idr_cleanup(tn, index);
1da177e4	133	return -EINVAL;
a57f19d3	134	}
53b2bf3f	135
87a2e70d	136	td = (struct xt_entry_target *)nla_data(tb[TCA_IPT_TARG]);
aeadd93f	137	if (nla_len(tb[TCA_IPT_TARG]) != td->u.target_size) {
d15eccea	138	if (exists)
65a206c0	139	tcf_idr_release(*a, bind);
0190c1d4 VB	140	else
0190c1d4 VB	141	tcf_idr_cleanup(tn, index);
1da177e4	142	return -EINVAL;
d15eccea	143	}
1da177e4	144
d15eccea	145	if (!exists) {
65a206c0	146	ret = tcf_idr_create(tn, index, est, a, ops, bind,
e3822678	147	false, 0);
0190c1d4 VB	148	if (ret) {
0190c1d4 VB	149	tcf_idr_cleanup(tn, index);
86062033	150	return ret;
0190c1d4	151	}
1da177e4 LT	152	ret = ACT_P_CREATED;
1da177e4 LT	153	} else {
1a29321e JHS	154	if (bind)/* dont override defaults */
1a29321e JHS	155	return 0;
1a29321e	156
4e8ddd7f VB	157	if (!ovr) {
4e8ddd7f VB	158	tcf_idr_release(*a, bind);
1da177e4	159	return -EEXIST;
4e8ddd7f	160	}
1da177e4	161	}
1587bac4	162	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
1da177e4 LT	163
	164	err = -ENOMEM;
	165	tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
e9ce1cd3	166	if (unlikely(!tname))
1da177e4	167	goto err1;
7ba699c6 PM	168	if (tb[TCA_IPT_TABLE] == NULL \|\|
7ba699c6 PM	169	nla_strlcpy(tname, tb[TCA_IPT_TABLE], IFNAMSIZ) >= IFNAMSIZ)
1da177e4 LT	170	strcpy(tname, "mangle");
1da177e4 LT	171
c7b1b249	172	t = kmemdup(td, td->u.target_size, GFP_KERNEL);
e9ce1cd3	173	if (unlikely(!t))
1da177e4	174	goto err2;
1da177e4	175
ec0acb09	176	err = ipt_init_target(net, t, tname, hook);
cc7ec456	177	if (err < 0)
1da177e4 LT	178	goto err3;
1da177e4 LT	179
a85a970a WC	180	ipt = to_ipt(*a);
a85a970a WC	181
e9ce1cd3	182	spin_lock_bh(&ipt->tcf_lock);
1da177e4	183	if (ret != ACT_P_CREATED) {
981471bd	184	ipt_destroy_target(ipt->tcfi_t, net);
e9ce1cd3 DM	185	kfree(ipt->tcfi_tname);
e9ce1cd3 DM	186	kfree(ipt->tcfi_t);
1da177e4	187	}
e9ce1cd3 DM	188	ipt->tcfi_tname = tname;
	189	ipt->tcfi_t = t;
	190	ipt->tcfi_hook = hook;
	191	spin_unlock_bh(&ipt->tcf_lock);
1da177e4	192	if (ret == ACT_P_CREATED)
65a206c0	193	tcf_idr_insert(tn, *a);
1da177e4 LT	194	return ret;
	195
	196	err3:
	197	kfree(t);
	198	err2:
	199	kfree(tname);
	200	err1:
8f67c90e	201	tcf_idr_release(*a, bind);
1da177e4 LT	202	return err;
	203	}
	204
ddf97ccd	205	static int tcf_ipt_init(struct net net, struct nlattr nla,
a85a970a	206	struct nlattr est, struct tc_action *a, int ovr,
85d0966f	207	int bind, bool rtnl_held, struct tcf_proto *tp,
abbb0d33	208	u32 flags, struct netlink_ext_ack *extack)
ddf97ccd	209	{
ec0acb09	210	return __tcf_ipt_init(net, ipt_net_id, nla, est, a, &act_ipt_ops, ovr,
abbb0d33	211	bind, tp, flags);
ddf97ccd WC	212	}
	213
	214	static int tcf_xt_init(struct net net, struct nlattr nla,
a85a970a	215	struct nlattr est, struct tc_action *a, int ovr,
85d0966f	216	int bind, bool unlocked, struct tcf_proto *tp,
abbb0d33	217	u32 flags, struct netlink_ext_ack *extack)
ddf97ccd	218	{
ec0acb09	219	return __tcf_ipt_init(net, xt_net_id, nla, est, a, &act_xt_ops, ovr,
abbb0d33	220	bind, tp, flags);
ddf97ccd WC	221	}
ddf97ccd WC	222
11b9695b JHS	223	static int tcf_ipt_act(struct sk_buff skb, const struct tc_action a,
11b9695b JHS	224	struct tcf_result *res)
1da177e4 LT	225	{
1da177e4 LT	226	int ret = 0, result = 0;
a85a970a	227	struct tcf_ipt *ipt = to_ipt(a);
4b560b44	228	struct xt_action_param par;
613dbd95 PNA	229	struct nf_hook_state state = {
	230	.net = dev_net(skb->dev),
	231	.in = skb->dev,
	232	.hook = ipt->tcfi_hook,
	233	.pf = NFPROTO_IPV4,
	234	};
1da177e4	235
14bbd6a5 PS	236	if (skb_unclone(skb, GFP_ATOMIC))
14bbd6a5 PS	237	return TC_ACT_UNSPEC;
1da177e4	238
e9ce1cd3	239	spin_lock(&ipt->tcf_lock);
1da177e4	240
9c4a4e48	241	tcf_lastuse_update(&ipt->tcf_tm);
bfe0d029	242	bstats_update(&ipt->tcf_bstats, skb);
1da177e4 LT	243
1da177e4 LT	244	/* yes, we have to worry about both in and out dev
cc7ec456 ED	245	* worry later - danger - this API seems to have changed
	246	* from earlier kernels
	247	*/
613dbd95	248	par.state = &state;
7eb35586 JE	249	par.target = ipt->tcfi_t->u.kernel.target;
	250	par.targinfo = ipt->tcfi_t->data;
	251	ret = par.target->target(skb, &par);
	252
1da177e4 LT	253	switch (ret) {
	254	case NF_ACCEPT:
	255	result = TC_ACT_OK;
	256	break;
	257	case NF_DROP:
	258	result = TC_ACT_SHOT;
e9ce1cd3	259	ipt->tcf_qstats.drops++;
1da177e4	260	break;
243bf6e2	261	case XT_CONTINUE:
1da177e4 LT	262	result = TC_ACT_PIPE;
	263	break;
	264	default:
e87cc472 JP	265	net_notice_ratelimited("tc filter: Bogus netfilter code %d assume ACCEPT\n",
e87cc472 JP	266	ret);
95df1b16	267	result = TC_ACT_OK;
1da177e4 LT	268	break;
1da177e4 LT	269	}
e9ce1cd3	270	spin_unlock(&ipt->tcf_lock);
1da177e4 LT	271	return result;
	272
	273	}
	274
0b0f43fe JHS	275	static int tcf_ipt_dump(struct sk_buff skb, struct tc_action a, int bind,
0b0f43fe JHS	276	int ref)
1da177e4	277	{
27a884dc	278	unsigned char *b = skb_tail_pointer(skb);
a85a970a	279	struct tcf_ipt *ipt = to_ipt(a);
87a2e70d	280	struct xt_entry_target *t;
1da177e4 LT	281	struct tcf_t tm;
1da177e4 LT	282	struct tc_cnt c;
1da177e4 LT	283
1da177e4 LT	284	/* for simple targets kernel size == user size
cc7ec456 ED	285	* user name = target name
	286	* for foolproof you need to not assume this
	287	*/
1da177e4	288
ff25276d	289	spin_lock_bh(&ipt->tcf_lock);
c7b1b249	290	t = kmemdup(ipt->tcfi_t, ipt->tcfi_t->u.user.target_size, GFP_ATOMIC);
e9ce1cd3	291	if (unlikely(!t))
7ba699c6	292	goto nla_put_failure;
1da177e4	293
036bb443 VB	294	c.bindcnt = atomic_read(&ipt->tcf_bindcnt) - bind;
036bb443 VB	295	c.refcnt = refcount_read(&ipt->tcf_refcnt) - ref;
e9ce1cd3 DM	296	strcpy(t->u.user.name, ipt->tcfi_t->u.kernel.target->name);
e9ce1cd3 DM	297
1b34ec43 DM	298	if (nla_put(skb, TCA_IPT_TARG, ipt->tcfi_t->u.user.target_size, t) \|\|
	299	nla_put_u32(skb, TCA_IPT_INDEX, ipt->tcf_index) \|\|
	300	nla_put_u32(skb, TCA_IPT_HOOK, ipt->tcfi_hook) \|\|
	301	nla_put(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c) \|\|
	302	nla_put_string(skb, TCA_IPT_TABLE, ipt->tcfi_tname))
	303	goto nla_put_failure;
48d8ee16 JHS	304
48d8ee16 JHS	305	tcf_tm_dump(&tm, &ipt->tcf_tm);
9854518e	306	if (nla_put_64bit(skb, TCA_IPT_TM, sizeof(tm), &tm, TCA_IPT_PAD))
1b34ec43	307	goto nla_put_failure;
48d8ee16	308
ff25276d	309	spin_unlock_bh(&ipt->tcf_lock);
1da177e4 LT	310	kfree(t);
	311	return skb->len;
	312
7ba699c6	313	nla_put_failure:
ff25276d	314	spin_unlock_bh(&ipt->tcf_lock);
dc5fc579	315	nlmsg_trim(skb, b);
1da177e4 LT	316	kfree(t);
	317	return -1;
	318	}
	319
ddf97ccd WC	320	static int tcf_ipt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	321	struct netlink_callback *cb, int type,
41780105 AA	322	const struct tc_action_ops *ops,
41780105 AA	323	struct netlink_ext_ack *extack)
ddf97ccd WC	324	{
	325	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	326
b3620145	327	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	328	}
ddf97ccd WC	329
f061b48c	330	static int tcf_ipt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	331	{
	332	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	333
65a206c0	334	return tcf_idr_search(tn, a, index);
ddf97ccd WC	335	}
ddf97ccd WC	336
1da177e4 LT	337	static struct tc_action_ops act_ipt_ops = {
1da177e4 LT	338	.kind = "ipt",
eddd2cf1	339	.id = TCA_ID_IPT,
1da177e4	340	.owner = THIS_MODULE,
11b9695b	341	.act = tcf_ipt_act,
1da177e4	342	.dump = tcf_ipt_dump,
86062033	343	.cleanup = tcf_ipt_release,
1da177e4	344	.init = tcf_ipt_init,
ddf97ccd WC	345	.walk = tcf_ipt_walker,
ddf97ccd WC	346	.lookup = tcf_ipt_search,
a85a970a	347	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	348	};
	349
	350	static __net_init int ipt_init_net(struct net *net)
	351	{
	352	struct tc_action_net *tn = net_generic(net, ipt_net_id);
	353
981471bd	354	return tc_action_net_init(net, tn, &act_ipt_ops);
ddf97ccd WC	355	}
ddf97ccd WC	356
039af9c6	357	static void __net_exit ipt_exit_net(struct list_head *net_list)
ddf97ccd	358	{
039af9c6	359	tc_action_net_exit(net_list, ipt_net_id);
ddf97ccd WC	360	}
	361
	362	static struct pernet_operations ipt_net_ops = {
	363	.init = ipt_init_net,
039af9c6	364	.exit_batch = ipt_exit_net,
ddf97ccd WC	365	.id = &ipt_net_id,
ddf97ccd WC	366	.size = sizeof(struct tc_action_net),
1da177e4 LT	367	};
1da177e4 LT	368
ddf97ccd WC	369	static int tcf_xt_walker(struct net net, struct sk_buff skb,
ddf97ccd WC	370	struct netlink_callback *cb, int type,
41780105 AA	371	const struct tc_action_ops *ops,
41780105 AA	372	struct netlink_ext_ack *extack)
ddf97ccd WC	373	{
	374	struct tc_action_net *tn = net_generic(net, xt_net_id);
	375
b3620145	376	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
ddf97ccd WC	377	}
ddf97ccd WC	378
f061b48c	379	static int tcf_xt_search(struct net net, struct tc_action *a, u32 index)
ddf97ccd WC	380	{
	381	struct tc_action_net *tn = net_generic(net, xt_net_id);
	382
65a206c0	383	return tcf_idr_search(tn, a, index);
ddf97ccd WC	384	}
ddf97ccd WC	385
0dcffd09 JHS	386	static struct tc_action_ops act_xt_ops = {
0dcffd09 JHS	387	.kind = "xt",
eddd2cf1	388	.id = TCA_ID_XT,
0dcffd09	389	.owner = THIS_MODULE,
11b9695b	390	.act = tcf_ipt_act,
0dcffd09	391	.dump = tcf_ipt_dump,
86062033	392	.cleanup = tcf_ipt_release,
ddf97ccd WC	393	.init = tcf_xt_init,
	394	.walk = tcf_xt_walker,
	395	.lookup = tcf_xt_search,
a85a970a	396	.size = sizeof(struct tcf_ipt),
ddf97ccd WC	397	};
	398
	399	static __net_init int xt_init_net(struct net *net)
	400	{
	401	struct tc_action_net *tn = net_generic(net, xt_net_id);
	402
981471bd	403	return tc_action_net_init(net, tn, &act_xt_ops);
ddf97ccd WC	404	}
ddf97ccd WC	405
039af9c6	406	static void __net_exit xt_exit_net(struct list_head *net_list)
ddf97ccd	407	{
039af9c6	408	tc_action_net_exit(net_list, xt_net_id);
ddf97ccd WC	409	}
	410
	411	static struct pernet_operations xt_net_ops = {
	412	.init = xt_init_net,
039af9c6	413	.exit_batch = xt_exit_net,
ddf97ccd WC	414	.id = &xt_net_id,
ddf97ccd WC	415	.size = sizeof(struct tc_action_net),
0dcffd09 JHS	416	};
	417
	418	MODULE_AUTHOR("Jamal Hadi Salim(2002-13)");
1da177e4 LT	419	MODULE_DESCRIPTION("Iptables target actions");
1da177e4 LT	420	MODULE_LICENSE("GPL");
0dcffd09	421	MODULE_ALIAS("act_xt");
1da177e4	422
e9ce1cd3	423	static int __init ipt_init_module(void)
1da177e4	424	{
4f1e9d89	425	int ret1, ret2;
369ba567	426
ddf97ccd	427	ret1 = tcf_register_action(&act_xt_ops, &xt_net_ops);
0dcffd09	428	if (ret1 < 0)
ddf97ccd WC	429	pr_err("Failed to load xt action\n");
	430
	431	ret2 = tcf_register_action(&act_ipt_ops, &ipt_net_ops);
0dcffd09	432	if (ret2 < 0)
ddf97ccd	433	pr_err("Failed to load ipt action\n");
0dcffd09	434
369ba567	435	if (ret1 < 0 && ret2 < 0) {
0dcffd09	436	return ret1;
369ba567	437	} else
0dcffd09	438	return 0;
1da177e4 LT	439	}
1da177e4 LT	440
e9ce1cd3	441	static void __exit ipt_cleanup_module(void)
1da177e4	442	{
ddf97ccd WC	443	tcf_unregister_action(&act_ipt_ops, &ipt_net_ops);
ddf97ccd WC	444	tcf_unregister_action(&act_xt_ops, &xt_net_ops);
1da177e4 LT	445	}
	446
	447	module_init(ipt_init_module);
	448	module_exit(ipt_cleanup_module);