[mirror_ubuntu-artful-kernel.git] / net / netfilter / nfnetlink_cttimeout.c

/*
 * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
 * (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation (or any later at your option).
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/rculist.h>
#include <linux/rculist_nulls.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/security.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netlink.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/slab.h>

#include <linux/netfilter.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_tuple.h>
#include <net/netfilter/nf_conntrack_timeout.h>

#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_cttimeout.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");

static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
	[CTA_TIMEOUT_NAME]	= { .type = NLA_NUL_STRING,
				    .len  = CTNL_TIMEOUT_NAME_MAX - 1},
	[CTA_TIMEOUT_L3PROTO]	= { .type = NLA_U16 },
	[CTA_TIMEOUT_L4PROTO]	= { .type = NLA_U8 },
	[CTA_TIMEOUT_DATA]	= { .type = NLA_NESTED },
};

static int
ctnl_timeout_parse_policy(void *timeouts, struct nf_conntrack_l4proto *l4proto,
			  struct net *net, const struct nlattr *attr)
{
	int ret = 0;

	if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) {
		struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1];

		ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
				       attr, l4proto->ctnl_timeout.nla_policy,
				       NULL);
		if (ret < 0)
			return ret;

		ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
	}
	return ret;
}

static int cttimeout_new_timeout(struct net *net, struct sock *ctnl,
				 struct sk_buff *skb,
				 const struct nlmsghdr *nlh,
				 const struct nlattr * const cda[],
				 struct netlink_ext_ack *extack)
{
	__u16 l3num;
	__u8 l4num;
	struct nf_conntrack_l4proto *l4proto;
	struct ctnl_timeout *timeout, *matching = NULL;
	char *name;
	int ret;

	if (!cda[CTA_TIMEOUT_NAME] ||
	    !cda[CTA_TIMEOUT_L3PROTO] ||
	    !cda[CTA_TIMEOUT_L4PROTO] ||
	    !cda[CTA_TIMEOUT_DATA])
		return -EINVAL;

	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);

	list_for_each_entry(timeout, &net->nfct_timeout_list, head) {
		if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
			continue;

		if (nlh->nlmsg_flags & NLM_F_EXCL)
			return -EEXIST;

		matching = timeout;
		break;
	}

	if (matching) {
		if (nlh->nlmsg_flags & NLM_F_REPLACE) {
			/* You cannot replace one timeout policy by another of
			 * different kind, sorry.
			 */
			if (matching->l3num != l3num ||
			    matching->l4proto->l4proto != l4num)
				return -EINVAL;

			return ctnl_timeout_parse_policy(&matching->data,
							 matching->l4proto, net,
							 cda[CTA_TIMEOUT_DATA]);
		}

		return -EBUSY;
	}

	l4proto = nf_ct_l4proto_find_get(l3num, l4num);

	/* This protocol is not supportted, skip. */
	if (l4proto->l4proto != l4num) {
		ret = -EOPNOTSUPP;
		goto err_proto_put;
	}

	timeout = kzalloc(sizeof(struct ctnl_timeout) +
			  l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
	if (timeout == NULL) {
		ret = -ENOMEM;
		goto err_proto_put;
	}

	ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net,
					cda[CTA_TIMEOUT_DATA]);
	if (ret < 0)
		goto err;

	strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
	timeout->l3num = l3num;
	timeout->l4proto = l4proto;
	refcount_set(&timeout->refcnt, 1);
	list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list);

	return 0;
err:
	kfree(timeout);
err_proto_put:
	nf_ct_l4proto_put(l4proto);
	return ret;
}

static int
ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
		       int event, struct ctnl_timeout *timeout)
{
	struct nlmsghdr *nlh;
	struct nfgenmsg *nfmsg;
	unsigned int flags = portid ? NLM_F_MULTI : 0;
	struct nf_conntrack_l4proto *l4proto = timeout->l4proto;

	event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
	if (nlh == NULL)
		goto nlmsg_failure;

	nfmsg = nlmsg_data(nlh);
	nfmsg->nfgen_family = AF_UNSPEC;
	nfmsg->version = NFNETLINK_V0;
	nfmsg->res_id = 0;

	if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) ||
	    nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) ||
	    nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) ||
	    nla_put_be32(skb, CTA_TIMEOUT_USE,
			 htonl(refcount_read(&timeout->refcnt))))
		goto nla_put_failure;

	if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
		struct nlattr *nest_parms;
		int ret;

		nest_parms = nla_nest_start(skb,
					    CTA_TIMEOUT_DATA | NLA_F_NESTED);
		if (!nest_parms)
			goto nla_put_failure;

		ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
		if (ret < 0)
			goto nla_put_failure;

		nla_nest_end(skb, nest_parms);
	}

	nlmsg_end(skb, nlh);
	return skb->len;

nlmsg_failure:
nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -1;
}

static int
ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	struct ctnl_timeout *cur, *last;

	if (cb->args[2])
		return 0;

	last = (struct ctnl_timeout *)cb->args[1];
	if (cb->args[1])
		cb->args[1] = 0;

	rcu_read_lock();
	list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) {
		if (last) {
			if (cur != last)
				continue;

			last = NULL;
		}
		if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid,
					   cb->nlh->nlmsg_seq,
					   NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
					   IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
			cb->args[1] = (unsigned long)cur;
			break;
		}
	}
	if (!cb->args[1])
		cb->args[2] = 1;
	rcu_read_unlock();
	return skb->len;
}

static int cttimeout_get_timeout(struct net *net, struct sock *ctnl,
				 struct sk_buff *skb,
				 const struct nlmsghdr *nlh,
				 const struct nlattr * const cda[],
				 struct netlink_ext_ack *extack)
{
	int ret = -ENOENT;
	char *name;
	struct ctnl_timeout *cur;

	if (nlh->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = ctnl_timeout_dump,
		};
		return netlink_dump_start(ctnl, skb, nlh, &c);
	}

	if (!cda[CTA_TIMEOUT_NAME])
		return -EINVAL;
	name = nla_data(cda[CTA_TIMEOUT_NAME]);

	list_for_each_entry(cur, &net->nfct_timeout_list, head) {
		struct sk_buff *skb2;

		if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
			continue;

		skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
		if (skb2 == NULL) {
			ret = -ENOMEM;
			break;
		}

		ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid,
					     nlh->nlmsg_seq,
					     NFNL_MSG_TYPE(nlh->nlmsg_type),
					     IPCTNL_MSG_TIMEOUT_NEW, cur);
		if (ret <= 0) {
			kfree_skb(skb2);
			break;
		}
		ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid,
					MSG_DONTWAIT);
		if (ret > 0)
			ret = 0;

		/* this avoids a loop in nfnetlink. */
		return ret == -EAGAIN ? -ENOBUFS : ret;
	}
	return ret;
}

static int untimeout(struct nf_conn *ct, void *timeout)
{
	struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);

	if (timeout_ext && (!timeout || timeout_ext->timeout == timeout))
		RCU_INIT_POINTER(timeout_ext->timeout, NULL);

	/* We are not intended to delete this conntrack. */
	return 0;
}

static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout)
{
	nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
}

/* try to delete object, fail if it is still in use. */
static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout)
{
	int ret = 0;

	/* We want to avoid races with ctnl_timeout_put. So only when the
	 * current refcnt is 1, we decrease it to 0.
	 */
	if (refcount_dec_if_one(&timeout->refcnt)) {
		/* We are protected by nfnl mutex. */
		list_del_rcu(&timeout->head);
		nf_ct_l4proto_put(timeout->l4proto);
		ctnl_untimeout(net, timeout);
		kfree_rcu(timeout, rcu_head);
	} else {
		ret = -EBUSY;
	}
	return ret;
}

static int cttimeout_del_timeout(struct net *net, struct sock *ctnl,
				 struct sk_buff *skb,
				 const struct nlmsghdr *nlh,
				 const struct nlattr * const cda[],
				 struct netlink_ext_ack *extack)
{
	struct ctnl_timeout *cur, *tmp;
	int ret = -ENOENT;
	char *name;

	if (!cda[CTA_TIMEOUT_NAME]) {
		list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list,
					 head)
			ctnl_timeout_try_del(net, cur);

		return 0;
	}
	name = nla_data(cda[CTA_TIMEOUT_NAME]);

	list_for_each_entry(cur, &net->nfct_timeout_list, head) {
		if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
			continue;

		ret = ctnl_timeout_try_del(net, cur);
		if (ret < 0)
			return ret;

		break;
	}
	return ret;
}

static int cttimeout_default_set(struct net *net, struct sock *ctnl,
				 struct sk_buff *skb,
				 const struct nlmsghdr *nlh,
				 const struct nlattr * const cda[],
				 struct netlink_ext_ack *extack)
{
	__u16 l3num;
	__u8 l4num;
	struct nf_conntrack_l4proto *l4proto;
	unsigned int *timeouts;
	int ret;

	if (!cda[CTA_TIMEOUT_L3PROTO] ||
	    !cda[CTA_TIMEOUT_L4PROTO] ||
	    !cda[CTA_TIMEOUT_DATA])
		return -EINVAL;

	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	l4proto = nf_ct_l4proto_find_get(l3num, l4num);

	/* This protocol is not supported, skip. */
	if (l4proto->l4proto != l4num) {
		ret = -EOPNOTSUPP;
		goto err;
	}

	timeouts = l4proto->get_timeouts(net);

	ret = ctnl_timeout_parse_policy(timeouts, l4proto, net,
					cda[CTA_TIMEOUT_DATA]);
	if (ret < 0)
		goto err;

	nf_ct_l4proto_put(l4proto);
	return 0;
err:
	nf_ct_l4proto_put(l4proto);
	return ret;
}

static int
cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
			    u32 seq, u32 type, int event,
			    struct nf_conntrack_l4proto *l4proto)
{
	struct nlmsghdr *nlh;
	struct nfgenmsg *nfmsg;
	unsigned int flags = portid ? NLM_F_MULTI : 0;

	event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
	if (nlh == NULL)
		goto nlmsg_failure;

	nfmsg = nlmsg_data(nlh);
	nfmsg->nfgen_family = AF_UNSPEC;
	nfmsg->version = NFNETLINK_V0;
	nfmsg->res_id = 0;

	if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) ||
	    nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
		goto nla_put_failure;

	if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
		struct nlattr *nest_parms;
		unsigned int *timeouts = l4proto->get_timeouts(net);
		int ret;

		nest_parms = nla_nest_start(skb,
					    CTA_TIMEOUT_DATA | NLA_F_NESTED);
		if (!nest_parms)
			goto nla_put_failure;

		ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
		if (ret < 0)
			goto nla_put_failure;

		nla_nest_end(skb, nest_parms);
	}

	nlmsg_end(skb, nlh);
	return skb->len;

nlmsg_failure:
nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -1;
}

static int cttimeout_default_get(struct net *net, struct sock *ctnl,
				 struct sk_buff *skb,
				 const struct nlmsghdr *nlh,
				 const struct nlattr * const cda[],
				 struct netlink_ext_ack *extack)
{
	__u16 l3num;
	__u8 l4num;
	struct nf_conntrack_l4proto *l4proto;
	struct sk_buff *skb2;
	int ret, err;

	if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO])
		return -EINVAL;

	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	l4proto = nf_ct_l4proto_find_get(l3num, l4num);

	/* This protocol is not supported, skip. */
	if (l4proto->l4proto != l4num) {
		err = -EOPNOTSUPP;
		goto err;
	}

	skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (skb2 == NULL) {
		err = -ENOMEM;
		goto err;
	}

	ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid,
					  nlh->nlmsg_seq,
					  NFNL_MSG_TYPE(nlh->nlmsg_type),
					  IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
					  l4proto);
	if (ret <= 0) {
		kfree_skb(skb2);
		err = -ENOMEM;
		goto err;
	}
	ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
	if (ret > 0)
		ret = 0;

	/* this avoids a loop in nfnetlink. */
	return ret == -EAGAIN ? -ENOBUFS : ret;
err:
	nf_ct_l4proto_put(l4proto);
	return err;
}

#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
static struct ctnl_timeout *
ctnl_timeout_find_get(struct net *net, const char *name)
{
	struct ctnl_timeout *timeout, *matching = NULL;

	rcu_read_lock();
	list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) {
		if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
			continue;

		if (!try_module_get(THIS_MODULE))
			goto err;

		if (!refcount_inc_not_zero(&timeout->refcnt)) {
			module_put(THIS_MODULE);
			goto err;
		}
		matching = timeout;
		break;
	}
err:
	rcu_read_unlock();
	return matching;
}

static void ctnl_timeout_put(struct ctnl_timeout *timeout)
{
	if (refcount_dec_and_test(&timeout->refcnt))
		kfree_rcu(timeout, rcu_head);

	module_put(THIS_MODULE);
}
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */

static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
	[IPCTNL_MSG_TIMEOUT_NEW]	= { .call = cttimeout_new_timeout,
					    .attr_count = CTA_TIMEOUT_MAX,
					    .policy = cttimeout_nla_policy },
	[IPCTNL_MSG_TIMEOUT_GET]	= { .call = cttimeout_get_timeout,
					    .attr_count = CTA_TIMEOUT_MAX,
					    .policy = cttimeout_nla_policy },
	[IPCTNL_MSG_TIMEOUT_DELETE]	= { .call = cttimeout_del_timeout,
					    .attr_count = CTA_TIMEOUT_MAX,
					    .policy = cttimeout_nla_policy },
	[IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set,
					    .attr_count = CTA_TIMEOUT_MAX,
					    .policy = cttimeout_nla_policy },
	[IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get,
					    .attr_count = CTA_TIMEOUT_MAX,
					    .policy = cttimeout_nla_policy },
};

static const struct nfnetlink_subsystem cttimeout_subsys = {
	.name				= "conntrack_timeout",
	.subsys_id			= NFNL_SUBSYS_CTNETLINK_TIMEOUT,
	.cb_count			= IPCTNL_MSG_TIMEOUT_MAX,
	.cb				= cttimeout_cb,
};

MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);

static int __net_init cttimeout_net_init(struct net *net)
{
	INIT_LIST_HEAD(&net->nfct_timeout_list);

	return 0;
}

static void __net_exit cttimeout_net_exit(struct net *net)
{
	struct ctnl_timeout *cur, *tmp;

	ctnl_untimeout(net, NULL);

	list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) {
		list_del_rcu(&cur->head);
		nf_ct_l4proto_put(cur->l4proto);

		if (refcount_dec_and_test(&cur->refcnt))
			kfree_rcu(cur, rcu_head);
	}
}

static struct pernet_operations cttimeout_ops = {
	.init	= cttimeout_net_init,
	.exit	= cttimeout_net_exit,
};

static int __init cttimeout_init(void)
{
	int ret;

	ret = register_pernet_subsys(&cttimeout_ops);
	if (ret < 0)
		return ret;

	ret = nfnetlink_subsys_register(&cttimeout_subsys);
	if (ret < 0) {
		pr_err("cttimeout_init: cannot register cttimeout with "
			"nfnetlink.\n");
		goto err_out;
	}
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get);
	RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put);
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
	return 0;

err_out:
	unregister_pernet_subsys(&cttimeout_ops);
	return ret;
}

static void __exit cttimeout_exit(void)
{
	pr_info("cttimeout: unregistering from nfnetlink.\n");

	nfnetlink_subsys_unregister(&cttimeout_subsys);

	unregister_pernet_subsys(&cttimeout_ops);
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL);
	RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL);
	synchronize_rcu();
#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
}

module_init(cttimeout_init);
module_exit(cttimeout_exit);
Commit	Line	Data
50978462 PNA	1	/*
	2	* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
	3	* (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation (or any later at your option).
	8	*/
	9	#include <linux/init.h>
	10	#include <linux/module.h>
	11	#include <linux/kernel.h>
	12	#include <linux/rculist.h>
	13	#include <linux/rculist_nulls.h>
	14	#include <linux/types.h>
	15	#include <linux/timer.h>
	16	#include <linux/security.h>
	17	#include <linux/skbuff.h>
	18	#include <linux/errno.h>
	19	#include <linux/netlink.h>
	20	#include <linux/spinlock.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/slab.h>
	23
	24	#include <linux/netfilter.h>
	25	#include <net/netlink.h>
	26	#include <net/sock.h>
	27	#include <net/netfilter/nf_conntrack.h>
	28	#include <net/netfilter/nf_conntrack_core.h>
	29	#include <net/netfilter/nf_conntrack_l3proto.h>
	30	#include <net/netfilter/nf_conntrack_l4proto.h>
	31	#include <net/netfilter/nf_conntrack_tuple.h>
24de58f4	32	#include <net/netfilter/nf_conntrack_timeout.h>
50978462 PNA	33
	34	#include <linux/netfilter/nfnetlink.h>
	35	#include <linux/netfilter/nfnetlink_cttimeout.h>
	36
	37	MODULE_LICENSE("GPL");
	38	MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
	39	MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");
	40
50978462	41	static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
e93b5f9f FW	42	[CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING,
e93b5f9f FW	43	.len = CTNL_TIMEOUT_NAME_MAX - 1},
50978462 PNA	44	[CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 },
	45	[CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 },
	46	[CTA_TIMEOUT_DATA] = { .type = NLA_NESTED },
	47	};
	48
	49	static int
91cb498e PNA	50	ctnl_timeout_parse_policy(void timeouts, struct nf_conntrack_l4proto l4proto,
91cb498e PNA	51	struct net net, const struct nlattr attr)
50978462 PNA	52	{
	53	int ret = 0;
	54
	55	if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) {
	56	struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1];
	57
130ffbc2	58	ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
fceb6435 JB	59	attr, l4proto->ctnl_timeout.nla_policy,
fceb6435 JB	60	NULL);
130ffbc2 DB	61	if (ret < 0)
130ffbc2 DB	62	return ret;
50978462	63
91cb498e	64	ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
50978462 PNA	65	}
	66	return ret;
	67	}
	68
7b8002a1 PNA	69	static int cttimeout_new_timeout(struct net net, struct sock ctnl,
	70	struct sk_buff *skb,
	71	const struct nlmsghdr *nlh,
04ba724b PNA	72	const struct nlattr * const cda[],
04ba724b PNA	73	struct netlink_ext_ack *extack)
50978462 PNA	74	{
	75	__u16 l3num;
	76	__u8 l4num;
	77	struct nf_conntrack_l4proto *l4proto;
	78	struct ctnl_timeout timeout, matching = NULL;
	79	char *name;
	80	int ret;
	81
	82	if (!cda[CTA_TIMEOUT_NAME] \|\|
	83	!cda[CTA_TIMEOUT_L3PROTO] \|\|
	84	!cda[CTA_TIMEOUT_L4PROTO] \|\|
	85	!cda[CTA_TIMEOUT_DATA])
	86	return -EINVAL;
	87
	88	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	89	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	90	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	91
19576c94	92	list_for_each_entry(timeout, &net->nfct_timeout_list, head) {
50978462 PNA	93	if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	94	continue;
	95
	96	if (nlh->nlmsg_flags & NLM_F_EXCL)
	97	return -EEXIST;
	98
	99	matching = timeout;
	100	break;
	101	}
	102
50978462 PNA	103	if (matching) {
	104	if (nlh->nlmsg_flags & NLM_F_REPLACE) {
	105	/* You cannot replace one timeout policy by another of
	106	* different kind, sorry.
	107	*/
	108	if (matching->l3num != l3num \|\|
23aaba5a LZ	109	matching->l4proto->l4proto != l4num)
	110	return -EINVAL;
	111
	112	return ctnl_timeout_parse_policy(&matching->data,
	113	matching->l4proto, net,
	114	cda[CTA_TIMEOUT_DATA]);
50978462	115	}
23aaba5a LZ	116
	117	return -EBUSY;
	118	}
	119
	120	l4proto = nf_ct_l4proto_find_get(l3num, l4num);
	121
	122	/* This protocol is not supportted, skip. */
	123	if (l4proto->l4proto != l4num) {
	124	ret = -EOPNOTSUPP;
c1ebd7df	125	goto err_proto_put;
50978462 PNA	126	}
	127
	128	timeout = kzalloc(sizeof(struct ctnl_timeout) +
	129	l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
c1ebd7df PNA	130	if (timeout == NULL) {
	131	ret = -ENOMEM;
	132	goto err_proto_put;
	133	}
50978462	134
91cb498e	135	ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net,
50978462 PNA	136	cda[CTA_TIMEOUT_DATA]);
	137	if (ret < 0)
	138	goto err;
	139
	140	strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
	141	timeout->l3num = l3num;
c1ebd7df	142	timeout->l4proto = l4proto;
b54ab92b	143	refcount_set(&timeout->refcnt, 1);
19576c94	144	list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list);
50978462 PNA	145
	146	return 0;
	147	err:
	148	kfree(timeout);
c1ebd7df PNA	149	err_proto_put:
c1ebd7df PNA	150	nf_ct_l4proto_put(l4proto);
50978462 PNA	151	return ret;
	152	}
	153
	154	static int
15e47304	155	ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
50978462 PNA	156	int event, struct ctnl_timeout *timeout)
	157	{
	158	struct nlmsghdr *nlh;
	159	struct nfgenmsg *nfmsg;
15e47304	160	unsigned int flags = portid ? NLM_F_MULTI : 0;
c1ebd7df	161	struct nf_conntrack_l4proto *l4proto = timeout->l4proto;
50978462	162
dedb67c4	163	event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
15e47304	164	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
50978462 PNA	165	if (nlh == NULL)
	166	goto nlmsg_failure;
	167
	168	nfmsg = nlmsg_data(nlh);
	169	nfmsg->nfgen_family = AF_UNSPEC;
	170	nfmsg->version = NFNETLINK_V0;
	171	nfmsg->res_id = 0;
	172
48f03bda DM	173	if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) \|\|
	174	nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) \|\|
	175	nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) \|\|
	176	nla_put_be32(skb, CTA_TIMEOUT_USE,
b54ab92b	177	htonl(refcount_read(&timeout->refcnt))))
48f03bda	178	goto nla_put_failure;
50978462	179
50978462 PNA	180	if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
	181	struct nlattr *nest_parms;
	182	int ret;
	183
	184	nest_parms = nla_nest_start(skb,
	185	CTA_TIMEOUT_DATA \| NLA_F_NESTED);
	186	if (!nest_parms)
	187	goto nla_put_failure;
	188
	189	ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
	190	if (ret < 0)
	191	goto nla_put_failure;
	192
	193	nla_nest_end(skb, nest_parms);
	194	}
c1ebd7df	195
50978462 PNA	196	nlmsg_end(skb, nlh);
	197	return skb->len;
	198
	199	nlmsg_failure:
	200	nla_put_failure:
	201	nlmsg_cancel(skb, nlh);
	202	return -1;
	203	}
	204
	205	static int
	206	ctnl_timeout_dump(struct sk_buff skb, struct netlink_callback cb)
	207	{
19576c94	208	struct net *net = sock_net(skb->sk);
50978462 PNA	209	struct ctnl_timeout cur, last;
	210
	211	if (cb->args[2])
	212	return 0;
	213
	214	last = (struct ctnl_timeout *)cb->args[1];
	215	if (cb->args[1])
	216	cb->args[1] = 0;
	217
	218	rcu_read_lock();
19576c94	219	list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) {
37bc4f8d PNA	220	if (last) {
	221	if (cur != last)
	222	continue;
50978462	223
37bc4f8d PNA	224	last = NULL;
37bc4f8d PNA	225	}
15e47304	226	if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid,
50978462 PNA	227	cb->nlh->nlmsg_seq,
	228	NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
	229	IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
	230	cb->args[1] = (unsigned long)cur;
	231	break;
	232	}
	233	}
	234	if (!cb->args[1])
	235	cb->args[2] = 1;
	236	rcu_read_unlock();
	237	return skb->len;
	238	}
	239
7b8002a1 PNA	240	static int cttimeout_get_timeout(struct net net, struct sock ctnl,
	241	struct sk_buff *skb,
	242	const struct nlmsghdr *nlh,
04ba724b PNA	243	const struct nlattr * const cda[],
04ba724b PNA	244	struct netlink_ext_ack *extack)
50978462 PNA	245	{
	246	int ret = -ENOENT;
	247	char *name;
	248	struct ctnl_timeout *cur;
	249
	250	if (nlh->nlmsg_flags & NLM_F_DUMP) {
	251	struct netlink_dump_control c = {
	252	.dump = ctnl_timeout_dump,
	253	};
	254	return netlink_dump_start(ctnl, skb, nlh, &c);
	255	}
	256
	257	if (!cda[CTA_TIMEOUT_NAME])
	258	return -EINVAL;
	259	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	260
19576c94	261	list_for_each_entry(cur, &net->nfct_timeout_list, head) {
50978462 PNA	262	struct sk_buff *skb2;
	263
	264	if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	265	continue;
	266
	267	skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	268	if (skb2 == NULL) {
	269	ret = -ENOMEM;
	270	break;
	271	}
	272
15e47304	273	ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid,
50978462 PNA	274	nlh->nlmsg_seq,
	275	NFNL_MSG_TYPE(nlh->nlmsg_type),
	276	IPCTNL_MSG_TIMEOUT_NEW, cur);
	277	if (ret <= 0) {
	278	kfree_skb(skb2);
	279	break;
	280	}
15e47304	281	ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid,
50978462 PNA	282	MSG_DONTWAIT);
	283	if (ret > 0)
	284	ret = 0;
	285
	286	/* this avoids a loop in nfnetlink. */
	287	return ret == -EAGAIN ? -ENOBUFS : ret;
	288	}
	289	return ret;
	290	}
	291
34158151	292	static int untimeout(struct nf_conn ct, void timeout)
ae2d708e	293	{
ae2d708e PNA	294	struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);
	295
	296	if (timeout_ext && (!timeout \|\| timeout_ext->timeout == timeout))
	297	RCU_INIT_POINTER(timeout_ext->timeout, NULL);
34158151 LZ	298
	299	/* We are not intended to delete this conntrack. */
	300	return 0;
ae2d708e PNA	301	}
ae2d708e PNA	302
19576c94	303	static void ctnl_untimeout(struct net net, struct ctnl_timeout timeout)
ae2d708e	304	{
34158151	305	nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
ae2d708e PNA	306	}
ae2d708e PNA	307
50978462	308	/* try to delete object, fail if it is still in use. */
19576c94	309	static int ctnl_timeout_try_del(struct net net, struct ctnl_timeout timeout)
50978462 PNA	310	{
	311	int ret = 0;
	312
b75911b6 LZ	313	/* We want to avoid races with ctnl_timeout_put. So only when the
	314	* current refcnt is 1, we decrease it to 0.
	315	*/
b54ab92b	316	if (refcount_dec_if_one(&timeout->refcnt)) {
50978462 PNA	317	/* We are protected by nfnl mutex. */
50978462 PNA	318	list_del_rcu(&timeout->head);
c1ebd7df	319	nf_ct_l4proto_put(timeout->l4proto);
19576c94	320	ctnl_untimeout(net, timeout);
50978462 PNA	321	kfree_rcu(timeout, rcu_head);
50978462 PNA	322	} else {
50978462 PNA	323	ret = -EBUSY;
	324	}
	325	return ret;
	326	}
	327
7b8002a1 PNA	328	static int cttimeout_del_timeout(struct net net, struct sock ctnl,
	329	struct sk_buff *skb,
	330	const struct nlmsghdr *nlh,
04ba724b PNA	331	const struct nlattr * const cda[],
04ba724b PNA	332	struct netlink_ext_ack *extack)
50978462	333	{
93fac10b	334	struct ctnl_timeout cur, tmp;
50978462	335	int ret = -ENOENT;
7b8002a1	336	char *name;
50978462 PNA	337
50978462 PNA	338	if (!cda[CTA_TIMEOUT_NAME]) {
93fac10b LZ	339	list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list,
93fac10b LZ	340	head)
19576c94	341	ctnl_timeout_try_del(net, cur);
50978462 PNA	342
	343	return 0;
	344	}
	345	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	346
19576c94	347	list_for_each_entry(cur, &net->nfct_timeout_list, head) {
50978462 PNA	348	if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	349	continue;
	350
19576c94	351	ret = ctnl_timeout_try_del(net, cur);
50978462 PNA	352	if (ret < 0)
	353	return ret;
	354
	355	break;
	356	}
	357	return ret;
	358	}
	359
7b8002a1 PNA	360	static int cttimeout_default_set(struct net net, struct sock ctnl,
	361	struct sk_buff *skb,
	362	const struct nlmsghdr *nlh,
04ba724b PNA	363	const struct nlattr * const cda[],
04ba724b PNA	364	struct netlink_ext_ack *extack)
91cb498e PNA	365	{
	366	__u16 l3num;
	367	__u8 l4num;
	368	struct nf_conntrack_l4proto *l4proto;
91cb498e PNA	369	unsigned int *timeouts;
	370	int ret;
	371
	372	if (!cda[CTA_TIMEOUT_L3PROTO] \|\|
	373	!cda[CTA_TIMEOUT_L4PROTO] \|\|
	374	!cda[CTA_TIMEOUT_DATA])
	375	return -EINVAL;
	376
	377	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	378	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	379	l4proto = nf_ct_l4proto_find_get(l3num, l4num);
	380
	381	/* This protocol is not supported, skip. */
	382	if (l4proto->l4proto != l4num) {
	383	ret = -EOPNOTSUPP;
	384	goto err;
	385	}
	386
	387	timeouts = l4proto->get_timeouts(net);
	388
	389	ret = ctnl_timeout_parse_policy(timeouts, l4proto, net,
	390	cda[CTA_TIMEOUT_DATA]);
	391	if (ret < 0)
	392	goto err;
	393
	394	nf_ct_l4proto_put(l4proto);
	395	return 0;
	396	err:
	397	nf_ct_l4proto_put(l4proto);
	398	return ret;
	399	}
	400
	401	static int
	402	cttimeout_default_fill_info(struct net net, struct sk_buff skb, u32 portid,
	403	u32 seq, u32 type, int event,
	404	struct nf_conntrack_l4proto *l4proto)
	405	{
	406	struct nlmsghdr *nlh;
	407	struct nfgenmsg *nfmsg;
	408	unsigned int flags = portid ? NLM_F_MULTI : 0;
	409
dedb67c4	410	event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
91cb498e PNA	411	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
	412	if (nlh == NULL)
	413	goto nlmsg_failure;
	414
	415	nfmsg = nlmsg_data(nlh);
	416	nfmsg->nfgen_family = AF_UNSPEC;
	417	nfmsg->version = NFNETLINK_V0;
	418	nfmsg->res_id = 0;
	419
	420	if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) \|\|
	421	nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
	422	goto nla_put_failure;
	423
	424	if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
	425	struct nlattr *nest_parms;
	426	unsigned int *timeouts = l4proto->get_timeouts(net);
	427	int ret;
	428
	429	nest_parms = nla_nest_start(skb,
	430	CTA_TIMEOUT_DATA \| NLA_F_NESTED);
	431	if (!nest_parms)
	432	goto nla_put_failure;
	433
	434	ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
	435	if (ret < 0)
	436	goto nla_put_failure;
	437
	438	nla_nest_end(skb, nest_parms);
	439	}
	440
	441	nlmsg_end(skb, nlh);
	442	return skb->len;
	443
	444	nlmsg_failure:
	445	nla_put_failure:
	446	nlmsg_cancel(skb, nlh);
	447	return -1;
	448	}
	449
7b8002a1 PNA	450	static int cttimeout_default_get(struct net net, struct sock ctnl,
7b8002a1 PNA	451	struct sk_buff *skb,
91cb498e	452	const struct nlmsghdr *nlh,
04ba724b PNA	453	const struct nlattr * const cda[],
04ba724b PNA	454	struct netlink_ext_ack *extack)
91cb498e PNA	455	{
	456	__u16 l3num;
	457	__u8 l4num;
	458	struct nf_conntrack_l4proto *l4proto;
91cb498e PNA	459	struct sk_buff *skb2;
	460	int ret, err;
	461
	462	if (!cda[CTA_TIMEOUT_L3PROTO] \|\| !cda[CTA_TIMEOUT_L4PROTO])
	463	return -EINVAL;
	464
	465	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	466	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	467	l4proto = nf_ct_l4proto_find_get(l3num, l4num);
	468
	469	/* This protocol is not supported, skip. */
	470	if (l4proto->l4proto != l4num) {
	471	err = -EOPNOTSUPP;
	472	goto err;
	473	}
	474
	475	skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	476	if (skb2 == NULL) {
	477	err = -ENOMEM;
	478	goto err;
	479	}
	480
	481	ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid,
	482	nlh->nlmsg_seq,
	483	NFNL_MSG_TYPE(nlh->nlmsg_type),
	484	IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
	485	l4proto);
	486	if (ret <= 0) {
	487	kfree_skb(skb2);
	488	err = -ENOMEM;
	489	goto err;
	490	}
	491	ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
	492	if (ret > 0)
	493	ret = 0;
	494
	495	/* this avoids a loop in nfnetlink. */
	496	return ret == -EAGAIN ? -ENOBUFS : ret;
	497	err:
	498	nf_ct_l4proto_put(l4proto);
	499	return err;
	500	}
	501
24de58f4	502	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
19576c94 PN	503	static struct ctnl_timeout *
19576c94 PN	504	ctnl_timeout_find_get(struct net net, const char name)
24de58f4 PNA	505	{
	506	struct ctnl_timeout timeout, matching = NULL;
	507
	508	rcu_read_lock();
19576c94	509	list_for_each_entry_rcu(timeout, &net->nfct_timeout_list, head) {
24de58f4 PNA	510	if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	511	continue;
	512
	513	if (!try_module_get(THIS_MODULE))
	514	goto err;
	515
b54ab92b	516	if (!refcount_inc_not_zero(&timeout->refcnt)) {
24de58f4 PNA	517	module_put(THIS_MODULE);
	518	goto err;
	519	}
	520	matching = timeout;
	521	break;
	522	}
	523	err:
	524	rcu_read_unlock();
	525	return matching;
	526	}
	527
	528	static void ctnl_timeout_put(struct ctnl_timeout *timeout)
	529	{
b54ab92b	530	if (refcount_dec_and_test(&timeout->refcnt))
b75911b6 LZ	531	kfree_rcu(timeout, rcu_head);
b75911b6 LZ	532
24de58f4 PNA	533	module_put(THIS_MODULE);
	534	}
	535	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
	536
50978462 PNA	537	static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
	538	[IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout,
	539	.attr_count = CTA_TIMEOUT_MAX,
	540	.policy = cttimeout_nla_policy },
	541	[IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout,
	542	.attr_count = CTA_TIMEOUT_MAX,
	543	.policy = cttimeout_nla_policy },
	544	[IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout,
	545	.attr_count = CTA_TIMEOUT_MAX,
	546	.policy = cttimeout_nla_policy },
91cb498e PNA	547	[IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set,
	548	.attr_count = CTA_TIMEOUT_MAX,
	549	.policy = cttimeout_nla_policy },
	550	[IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get,
	551	.attr_count = CTA_TIMEOUT_MAX,
	552	.policy = cttimeout_nla_policy },
50978462 PNA	553	};
	554
	555	static const struct nfnetlink_subsystem cttimeout_subsys = {
	556	.name = "conntrack_timeout",
	557	.subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT,
	558	.cb_count = IPCTNL_MSG_TIMEOUT_MAX,
	559	.cb = cttimeout_cb,
	560	};
	561
	562	MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);
	563
19576c94 PN	564	static int __net_init cttimeout_net_init(struct net *net)
	565	{
	566	INIT_LIST_HEAD(&net->nfct_timeout_list);
	567
	568	return 0;
	569	}
	570
	571	static void __net_exit cttimeout_net_exit(struct net *net)
	572	{
	573	struct ctnl_timeout cur, tmp;
	574
	575	ctnl_untimeout(net, NULL);
	576
	577	list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list, head) {
	578	list_del_rcu(&cur->head);
	579	nf_ct_l4proto_put(cur->l4proto);
b75911b6	580
b54ab92b	581	if (refcount_dec_and_test(&cur->refcnt))
b75911b6	582	kfree_rcu(cur, rcu_head);
19576c94 PN	583	}
	584	}
	585
	586	static struct pernet_operations cttimeout_ops = {
	587	.init = cttimeout_net_init,
	588	.exit = cttimeout_net_exit,
	589	};
	590
50978462 PNA	591	static int __init cttimeout_init(void)
	592	{
	593	int ret;
	594
19576c94 PN	595	ret = register_pernet_subsys(&cttimeout_ops);
	596	if (ret < 0)
	597	return ret;
	598
50978462 PNA	599	ret = nfnetlink_subsys_register(&cttimeout_subsys);
	600	if (ret < 0) {
	601	pr_err("cttimeout_init: cannot register cttimeout with "
	602	"nfnetlink.\n");
	603	goto err_out;
	604	}
24de58f4 PNA	605	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	606	RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, ctnl_timeout_find_get);
	607	RCU_INIT_POINTER(nf_ct_timeout_put_hook, ctnl_timeout_put);
	608	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
50978462 PNA	609	return 0;
	610
	611	err_out:
19576c94	612	unregister_pernet_subsys(&cttimeout_ops);
50978462 PNA	613	return ret;
	614	}
	615
	616	static void __exit cttimeout_exit(void)
	617	{
50978462 PNA	618	pr_info("cttimeout: unregistering from nfnetlink.\n");
	619
	620	nfnetlink_subsys_unregister(&cttimeout_subsys);
ae2d708e	621
19576c94	622	unregister_pernet_subsys(&cttimeout_ops);
24de58f4 PNA	623	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
	624	RCU_INIT_POINTER(nf_ct_timeout_find_get_hook, NULL);
	625	RCU_INIT_POINTER(nf_ct_timeout_put_hook, NULL);
3b7dabf0	626	synchronize_rcu();
24de58f4	627	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
50978462 PNA	628	}
	629
	630	module_init(cttimeout_init);
	631	module_exit(cttimeout_exit);