net/sched/act_ipt.c - linux - Git at Google

 // 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 <net/ip.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 = 1 << 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]	= NLA_POLICY_RANGE(NLA_U32, NF_INET_PRE_ROUTING,
 					   NF_INET_NUMHOOKS),
 	[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;
 		}
 	}

 	err = -EINVAL;
 	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
 	switch (hook) {
 	case NF_INET_PRE_ROUTING:
 		break;
 	case NF_INET_POST_ROUTING:
 		break;
 	default:
 		goto err1;
 	}

 	if (tb[TCA_IPT_TABLE]) {
 		/* mangle only for now */
 		if (nla_strcmp(tb[TCA_IPT_TABLE], "mangle"))
 			goto err1;
 	}

 	tname = kstrdup("mangle", GFP_KERNEL);
 	if (unlikely(!tname))
 		goto err1;

 	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);
 }

 static bool tcf_ipt_act_check(struct sk_buff *skb)
 {
 	const struct iphdr *iph;
 	unsigned int nhoff, len;

 	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
 		return false;

 	nhoff = skb_network_offset(skb);
 	iph = ip_hdr(skb);
 	if (iph->ihl < 5 || iph->version != 4)
 		return false;

 	len = skb_ip_totlen(skb);
 	if (skb->len < nhoff + len || len < (iph->ihl * 4u))
 		return false;

 	return pskb_may_pull(skb, iph->ihl * 4u);
 }

 TC_INDIRECT_SCOPE int tcf_ipt_act(struct sk_buff *skb,
 				  const struct tc_action *a,
 				  struct tcf_result *res)
 {
 	char saved_cb[sizeof_field(struct sk_buff, cb)];
 	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_protocol(skb, false) != htons(ETH_P_IP))
 		return TC_ACT_UNSPEC;

 	if (skb_unclone(skb, GFP_ATOMIC))
 		return TC_ACT_UNSPEC;

 	if (!tcf_ipt_act_check(skb))
 		return TC_ACT_UNSPEC;

 	if (state.hook == NF_INET_POST_ROUTING) {
 		if (!skb_dst(skb))
 			return TC_ACT_UNSPEC;

 		state.out = skb->dev;
 	}

 	memcpy(saved_cb, skb->cb, sizeof(saved_cb));

 	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;

 	memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));

 	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);

 	memcpy(skb->cb, saved_cb, sizeof(skb->cb));

 	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);
	// 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 <net/ip.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 = 1 << 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] = NLA_POLICY_RANGE(NLA_U32, NF_INET_PRE_ROUTING,
	NF_INET_NUMHOOKS),
	[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;
	}
	}

	err = -EINVAL;
	hook = nla_get_u32(tb[TCA_IPT_HOOK]);
	switch (hook) {
	case NF_INET_PRE_ROUTING:
	break;
	case NF_INET_POST_ROUTING:
	break;
	default:
	goto err1;
	}

	if (tb[TCA_IPT_TABLE]) {
	/* mangle only for now */
	if (nla_strcmp(tb[TCA_IPT_TABLE], "mangle"))
	goto err1;
	}

	tname = kstrdup("mangle", GFP_KERNEL);
	if (unlikely(!tname))
	goto err1;

	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);
	}

	static bool tcf_ipt_act_check(struct sk_buff *skb)
	{
	const struct iphdr *iph;
	unsigned int nhoff, len;

	if (!pskb_may_pull(skb, sizeof(struct iphdr)))
	return false;

	nhoff = skb_network_offset(skb);
	iph = ip_hdr(skb);
	if (iph->ihl < 5 \|\| iph->version != 4)
	return false;

	len = skb_ip_totlen(skb);
	if (skb->len < nhoff + len \|\| len < (iph->ihl * 4u))
	return false;

	return pskb_may_pull(skb, iph->ihl * 4u);
	}

	TC_INDIRECT_SCOPE int tcf_ipt_act(struct sk_buff *skb,
	const struct tc_action *a,
	struct tcf_result *res)
	{
	char saved_cb[sizeof_field(struct sk_buff, cb)];
	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_protocol(skb, false) != htons(ETH_P_IP))
	return TC_ACT_UNSPEC;

	if (skb_unclone(skb, GFP_ATOMIC))
	return TC_ACT_UNSPEC;

	if (!tcf_ipt_act_check(skb))
	return TC_ACT_UNSPEC;

	if (state.hook == NF_INET_POST_ROUTING) {
	if (!skb_dst(skb))
	return TC_ACT_UNSPEC;

	state.out = skb->dev;
	}

	memcpy(saved_cb, skb->cb, sizeof(saved_cb));

	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;

	memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));

	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);

	memcpy(skb->cb, saved_cb, sizeof(skb->cb));

	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);