[mirror_ubuntu-bionic-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,
			  const 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;
	const 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;
	const 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)
{
	const struct nf_conntrack_l4proto *l4proto;
	unsigned int *timeouts;
	__u16 l3num;
	__u8 l4num;
	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,
			    const 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)
{
	const struct nf_conntrack_l4proto *l4proto;
	struct sk_buff *skb2;
	int ret, err;
	__u16 l3num;
	__u8 l4num;

	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;

	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:
	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;

	nf_ct_unconfirmed_destroy(net);
	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
2a04aabf JL	50	ctnl_timeout_parse_policy(void *timeouts,
2a04aabf JL	51	const struct nf_conntrack_l4proto *l4proto,
91cb498e	52	struct net net, const struct nlattr attr)
50978462 PNA	53	{
	54	int ret = 0;
	55
	56	if (likely(l4proto->ctnl_timeout.nlattr_to_obj)) {
	57	struct nlattr *tb[l4proto->ctnl_timeout.nlattr_max+1];
	58
130ffbc2	59	ret = nla_parse_nested(tb, l4proto->ctnl_timeout.nlattr_max,
fceb6435 JB	60	attr, l4proto->ctnl_timeout.nla_policy,
fceb6435 JB	61	NULL);
130ffbc2 DB	62	if (ret < 0)
130ffbc2 DB	63	return ret;
50978462	64
91cb498e	65	ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeouts);
50978462 PNA	66	}
	67	return ret;
	68	}
	69
7b8002a1 PNA	70	static int cttimeout_new_timeout(struct net net, struct sock ctnl,
	71	struct sk_buff *skb,
	72	const struct nlmsghdr *nlh,
04ba724b PNA	73	const struct nlattr * const cda[],
04ba724b PNA	74	struct netlink_ext_ack *extack)
50978462 PNA	75	{
	76	__u16 l3num;
	77	__u8 l4num;
b3480fe0	78	const struct nf_conntrack_l4proto *l4proto;
50978462 PNA	79	struct ctnl_timeout timeout, matching = NULL;
	80	char *name;
	81	int ret;
	82
	83	if (!cda[CTA_TIMEOUT_NAME] \|\|
	84	!cda[CTA_TIMEOUT_L3PROTO] \|\|
	85	!cda[CTA_TIMEOUT_L4PROTO] \|\|
	86	!cda[CTA_TIMEOUT_DATA])
	87	return -EINVAL;
	88
	89	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	90	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	91	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	92
19576c94	93	list_for_each_entry(timeout, &net->nfct_timeout_list, head) {
50978462 PNA	94	if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	95	continue;
	96
	97	if (nlh->nlmsg_flags & NLM_F_EXCL)
	98	return -EEXIST;
	99
	100	matching = timeout;
	101	break;
	102	}
	103
50978462 PNA	104	if (matching) {
	105	if (nlh->nlmsg_flags & NLM_F_REPLACE) {
	106	/* You cannot replace one timeout policy by another of
	107	* different kind, sorry.
	108	*/
	109	if (matching->l3num != l3num \|\|
23aaba5a LZ	110	matching->l4proto->l4proto != l4num)
	111	return -EINVAL;
	112
	113	return ctnl_timeout_parse_policy(&matching->data,
	114	matching->l4proto, net,
	115	cda[CTA_TIMEOUT_DATA]);
50978462	116	}
23aaba5a LZ	117
	118	return -EBUSY;
	119	}
	120
	121	l4proto = nf_ct_l4proto_find_get(l3num, l4num);
	122
	123	/* This protocol is not supportted, skip. */
	124	if (l4proto->l4proto != l4num) {
	125	ret = -EOPNOTSUPP;
c1ebd7df	126	goto err_proto_put;
50978462 PNA	127	}
	128
	129	timeout = kzalloc(sizeof(struct ctnl_timeout) +
	130	l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
c1ebd7df PNA	131	if (timeout == NULL) {
	132	ret = -ENOMEM;
	133	goto err_proto_put;
	134	}
50978462	135
91cb498e	136	ret = ctnl_timeout_parse_policy(&timeout->data, l4proto, net,
50978462 PNA	137	cda[CTA_TIMEOUT_DATA]);
	138	if (ret < 0)
	139	goto err;
	140
	141	strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
	142	timeout->l3num = l3num;
c1ebd7df	143	timeout->l4proto = l4proto;
b54ab92b	144	refcount_set(&timeout->refcnt, 1);
19576c94	145	list_add_tail_rcu(&timeout->head, &net->nfct_timeout_list);
50978462 PNA	146
	147	return 0;
	148	err:
	149	kfree(timeout);
c1ebd7df PNA	150	err_proto_put:
c1ebd7df PNA	151	nf_ct_l4proto_put(l4proto);
50978462 PNA	152	return ret;
	153	}
	154
	155	static int
15e47304	156	ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
50978462 PNA	157	int event, struct ctnl_timeout *timeout)
	158	{
	159	struct nlmsghdr *nlh;
	160	struct nfgenmsg *nfmsg;
15e47304	161	unsigned int flags = portid ? NLM_F_MULTI : 0;
b3480fe0	162	const struct nf_conntrack_l4proto *l4proto = timeout->l4proto;
50978462	163
dedb67c4	164	event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
15e47304	165	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
50978462 PNA	166	if (nlh == NULL)
	167	goto nlmsg_failure;
	168
	169	nfmsg = nlmsg_data(nlh);
	170	nfmsg->nfgen_family = AF_UNSPEC;
	171	nfmsg->version = NFNETLINK_V0;
	172	nfmsg->res_id = 0;
	173
48f03bda DM	174	if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) \|\|
	175	nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(timeout->l3num)) \|\|
	176	nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, timeout->l4proto->l4proto) \|\|
	177	nla_put_be32(skb, CTA_TIMEOUT_USE,
b54ab92b	178	htonl(refcount_read(&timeout->refcnt))))
48f03bda	179	goto nla_put_failure;
50978462	180
50978462 PNA	181	if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
	182	struct nlattr *nest_parms;
	183	int ret;
	184
	185	nest_parms = nla_nest_start(skb,
	186	CTA_TIMEOUT_DATA \| NLA_F_NESTED);
	187	if (!nest_parms)
	188	goto nla_put_failure;
	189
	190	ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->data);
	191	if (ret < 0)
	192	goto nla_put_failure;
	193
	194	nla_nest_end(skb, nest_parms);
	195	}
c1ebd7df	196
50978462 PNA	197	nlmsg_end(skb, nlh);
	198	return skb->len;
	199
	200	nlmsg_failure:
	201	nla_put_failure:
	202	nlmsg_cancel(skb, nlh);
	203	return -1;
	204	}
	205
	206	static int
	207	ctnl_timeout_dump(struct sk_buff skb, struct netlink_callback cb)
	208	{
19576c94	209	struct net *net = sock_net(skb->sk);
50978462 PNA	210	struct ctnl_timeout cur, last;
	211
	212	if (cb->args[2])
	213	return 0;
	214
	215	last = (struct ctnl_timeout *)cb->args[1];
	216	if (cb->args[1])
	217	cb->args[1] = 0;
	218
	219	rcu_read_lock();
19576c94	220	list_for_each_entry_rcu(cur, &net->nfct_timeout_list, head) {
37bc4f8d PNA	221	if (last) {
	222	if (cur != last)
	223	continue;
50978462	224
37bc4f8d PNA	225	last = NULL;
37bc4f8d PNA	226	}
15e47304	227	if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid,
50978462 PNA	228	cb->nlh->nlmsg_seq,
	229	NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
	230	IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
	231	cb->args[1] = (unsigned long)cur;
	232	break;
	233	}
	234	}
	235	if (!cb->args[1])
	236	cb->args[2] = 1;
	237	rcu_read_unlock();
	238	return skb->len;
	239	}
	240
7b8002a1 PNA	241	static int cttimeout_get_timeout(struct net net, struct sock ctnl,
	242	struct sk_buff *skb,
	243	const struct nlmsghdr *nlh,
04ba724b PNA	244	const struct nlattr * const cda[],
04ba724b PNA	245	struct netlink_ext_ack *extack)
50978462 PNA	246	{
	247	int ret = -ENOENT;
	248	char *name;
	249	struct ctnl_timeout *cur;
	250
	251	if (nlh->nlmsg_flags & NLM_F_DUMP) {
	252	struct netlink_dump_control c = {
	253	.dump = ctnl_timeout_dump,
	254	};
	255	return netlink_dump_start(ctnl, skb, nlh, &c);
	256	}
	257
	258	if (!cda[CTA_TIMEOUT_NAME])
	259	return -EINVAL;
	260	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	261
19576c94	262	list_for_each_entry(cur, &net->nfct_timeout_list, head) {
50978462 PNA	263	struct sk_buff *skb2;
	264
	265	if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	266	continue;
	267
	268	skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	269	if (skb2 == NULL) {
	270	ret = -ENOMEM;
	271	break;
	272	}
	273
15e47304	274	ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid,
50978462 PNA	275	nlh->nlmsg_seq,
	276	NFNL_MSG_TYPE(nlh->nlmsg_type),
	277	IPCTNL_MSG_TIMEOUT_NEW, cur);
	278	if (ret <= 0) {
	279	kfree_skb(skb2);
	280	break;
	281	}
15e47304	282	ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid,
50978462 PNA	283	MSG_DONTWAIT);
	284	if (ret > 0)
	285	ret = 0;
	286
	287	/* this avoids a loop in nfnetlink. */
	288	return ret == -EAGAIN ? -ENOBUFS : ret;
	289	}
	290	return ret;
	291	}
	292
34158151	293	static int untimeout(struct nf_conn ct, void timeout)
ae2d708e	294	{
ae2d708e PNA	295	struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);
	296
	297	if (timeout_ext && (!timeout \|\| timeout_ext->timeout == timeout))
	298	RCU_INIT_POINTER(timeout_ext->timeout, NULL);
34158151 LZ	299
	300	/* We are not intended to delete this conntrack. */
	301	return 0;
ae2d708e PNA	302	}
ae2d708e PNA	303
19576c94	304	static void ctnl_untimeout(struct net net, struct ctnl_timeout timeout)
ae2d708e	305	{
34158151	306	nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
ae2d708e PNA	307	}
ae2d708e PNA	308
50978462	309	/* try to delete object, fail if it is still in use. */
19576c94	310	static int ctnl_timeout_try_del(struct net net, struct ctnl_timeout timeout)
50978462 PNA	311	{
	312	int ret = 0;
	313
b75911b6 LZ	314	/* We want to avoid races with ctnl_timeout_put. So only when the
	315	* current refcnt is 1, we decrease it to 0.
	316	*/
b54ab92b	317	if (refcount_dec_if_one(&timeout->refcnt)) {
50978462 PNA	318	/* We are protected by nfnl mutex. */
50978462 PNA	319	list_del_rcu(&timeout->head);
c1ebd7df	320	nf_ct_l4proto_put(timeout->l4proto);
19576c94	321	ctnl_untimeout(net, timeout);
50978462 PNA	322	kfree_rcu(timeout, rcu_head);
50978462 PNA	323	} else {
50978462 PNA	324	ret = -EBUSY;
	325	}
	326	return ret;
	327	}
	328
7b8002a1 PNA	329	static int cttimeout_del_timeout(struct net net, struct sock ctnl,
	330	struct sk_buff *skb,
	331	const struct nlmsghdr *nlh,
04ba724b PNA	332	const struct nlattr * const cda[],
04ba724b PNA	333	struct netlink_ext_ack *extack)
50978462	334	{
93fac10b	335	struct ctnl_timeout cur, tmp;
50978462	336	int ret = -ENOENT;
7b8002a1	337	char *name;
50978462 PNA	338
50978462 PNA	339	if (!cda[CTA_TIMEOUT_NAME]) {
93fac10b LZ	340	list_for_each_entry_safe(cur, tmp, &net->nfct_timeout_list,
93fac10b LZ	341	head)
19576c94	342	ctnl_timeout_try_del(net, cur);
50978462 PNA	343
	344	return 0;
	345	}
	346	name = nla_data(cda[CTA_TIMEOUT_NAME]);
	347
19576c94	348	list_for_each_entry(cur, &net->nfct_timeout_list, head) {
50978462 PNA	349	if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
	350	continue;
	351
19576c94	352	ret = ctnl_timeout_try_del(net, cur);
50978462 PNA	353	if (ret < 0)
	354	return ret;
	355
	356	break;
	357	}
	358	return ret;
	359	}
	360
7b8002a1 PNA	361	static int cttimeout_default_set(struct net net, struct sock ctnl,
	362	struct sk_buff *skb,
	363	const struct nlmsghdr *nlh,
04ba724b PNA	364	const struct nlattr * const cda[],
04ba724b PNA	365	struct netlink_ext_ack *extack)
91cb498e	366	{
b3480fe0 FW	367	const struct nf_conntrack_l4proto *l4proto;
b3480fe0 FW	368	unsigned int *timeouts;
91cb498e PNA	369	__u16 l3num;
91cb498e PNA	370	__u8 l4num;
91cb498e PNA	371	int ret;
	372
	373	if (!cda[CTA_TIMEOUT_L3PROTO] \|\|
	374	!cda[CTA_TIMEOUT_L4PROTO] \|\|
	375	!cda[CTA_TIMEOUT_DATA])
	376	return -EINVAL;
	377
	378	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	379	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	380	l4proto = nf_ct_l4proto_find_get(l3num, l4num);
	381
	382	/* This protocol is not supported, skip. */
	383	if (l4proto->l4proto != l4num) {
	384	ret = -EOPNOTSUPP;
	385	goto err;
	386	}
	387
	388	timeouts = l4proto->get_timeouts(net);
	389
	390	ret = ctnl_timeout_parse_policy(timeouts, l4proto, net,
	391	cda[CTA_TIMEOUT_DATA]);
	392	if (ret < 0)
	393	goto err;
	394
	395	nf_ct_l4proto_put(l4proto);
	396	return 0;
	397	err:
	398	nf_ct_l4proto_put(l4proto);
	399	return ret;
	400	}
	401
	402	static int
	403	cttimeout_default_fill_info(struct net net, struct sk_buff skb, u32 portid,
	404	u32 seq, u32 type, int event,
2a04aabf	405	const struct nf_conntrack_l4proto *l4proto)
91cb498e PNA	406	{
	407	struct nlmsghdr *nlh;
	408	struct nfgenmsg *nfmsg;
	409	unsigned int flags = portid ? NLM_F_MULTI : 0;
	410
dedb67c4	411	event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
91cb498e PNA	412	nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
	413	if (nlh == NULL)
	414	goto nlmsg_failure;
	415
	416	nfmsg = nlmsg_data(nlh);
	417	nfmsg->nfgen_family = AF_UNSPEC;
	418	nfmsg->version = NFNETLINK_V0;
	419	nfmsg->res_id = 0;
	420
	421	if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l4proto->l3proto)) \|\|
	422	nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
	423	goto nla_put_failure;
	424
	425	if (likely(l4proto->ctnl_timeout.obj_to_nlattr)) {
	426	struct nlattr *nest_parms;
	427	unsigned int *timeouts = l4proto->get_timeouts(net);
	428	int ret;
	429
	430	nest_parms = nla_nest_start(skb,
	431	CTA_TIMEOUT_DATA \| NLA_F_NESTED);
	432	if (!nest_parms)
	433	goto nla_put_failure;
	434
	435	ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
	436	if (ret < 0)
	437	goto nla_put_failure;
	438
	439	nla_nest_end(skb, nest_parms);
	440	}
	441
	442	nlmsg_end(skb, nlh);
	443	return skb->len;
	444
	445	nlmsg_failure:
	446	nla_put_failure:
	447	nlmsg_cancel(skb, nlh);
	448	return -1;
	449	}
	450
7b8002a1 PNA	451	static int cttimeout_default_get(struct net net, struct sock ctnl,
7b8002a1 PNA	452	struct sk_buff *skb,
91cb498e	453	const struct nlmsghdr *nlh,
04ba724b PNA	454	const struct nlattr * const cda[],
04ba724b PNA	455	struct netlink_ext_ack *extack)
91cb498e	456	{
b3480fe0	457	const struct nf_conntrack_l4proto *l4proto;
91cb498e PNA	458	struct sk_buff *skb2;
91cb498e PNA	459	int ret, err;
b3480fe0 FW	460	__u16 l3num;
b3480fe0 FW	461	__u8 l4num;
91cb498e PNA	462
	463	if (!cda[CTA_TIMEOUT_L3PROTO] \|\| !cda[CTA_TIMEOUT_L4PROTO])
	464	return -EINVAL;
	465
	466	l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
	467	l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
	468	l4proto = nf_ct_l4proto_find_get(l3num, l4num);
	469
	470	/* This protocol is not supported, skip. */
	471	if (l4proto->l4proto != l4num) {
	472	err = -EOPNOTSUPP;
	473	goto err;
	474	}
	475
	476	skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	477	if (skb2 == NULL) {
	478	err = -ENOMEM;
	479	goto err;
	480	}
	481
	482	ret = cttimeout_default_fill_info(net, skb2, NETLINK_CB(skb).portid,
	483	nlh->nlmsg_seq,
	484	NFNL_MSG_TYPE(nlh->nlmsg_type),
	485	IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
	486	l4proto);
	487	if (ret <= 0) {
	488	kfree_skb(skb2);
	489	err = -ENOMEM;
	490	goto err;
	491	}
	492	ret = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
	493	if (ret > 0)
	494	ret = 0;
	495
	496	/* this avoids a loop in nfnetlink. */
	497	return ret == -EAGAIN ? -ENOBUFS : ret;
	498	err:
	499	nf_ct_l4proto_put(l4proto);
	500	return err;
	501	}
	502
24de58f4	503	#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
19576c94 PN	504	static struct ctnl_timeout *
19576c94 PN	505	ctnl_timeout_find_get(struct net net, const char name)
24de58f4 PNA	506	{
	507	struct ctnl_timeout timeout, matching = NULL;
	508
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:
24de58f4 PNA	524	return matching;
	525	}
	526
	527	static void ctnl_timeout_put(struct ctnl_timeout *timeout)
	528	{
b54ab92b	529	if (refcount_dec_and_test(&timeout->refcnt))
b75911b6 LZ	530	kfree_rcu(timeout, rcu_head);
b75911b6 LZ	531
24de58f4 PNA	532	module_put(THIS_MODULE);
	533	}
	534	#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
	535
50978462 PNA	536	static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
	537	[IPCTNL_MSG_TIMEOUT_NEW] = { .call = cttimeout_new_timeout,
	538	.attr_count = CTA_TIMEOUT_MAX,
	539	.policy = cttimeout_nla_policy },
	540	[IPCTNL_MSG_TIMEOUT_GET] = { .call = cttimeout_get_timeout,
	541	.attr_count = CTA_TIMEOUT_MAX,
	542	.policy = cttimeout_nla_policy },
	543	[IPCTNL_MSG_TIMEOUT_DELETE] = { .call = cttimeout_del_timeout,
	544	.attr_count = CTA_TIMEOUT_MAX,
	545	.policy = cttimeout_nla_policy },
91cb498e PNA	546	[IPCTNL_MSG_TIMEOUT_DEFAULT_SET]= { .call = cttimeout_default_set,
	547	.attr_count = CTA_TIMEOUT_MAX,
	548	.policy = cttimeout_nla_policy },
	549	[IPCTNL_MSG_TIMEOUT_DEFAULT_GET]= { .call = cttimeout_default_get,
	550	.attr_count = CTA_TIMEOUT_MAX,
	551	.policy = cttimeout_nla_policy },
50978462 PNA	552	};
	553
	554	static const struct nfnetlink_subsystem cttimeout_subsys = {
	555	.name = "conntrack_timeout",
	556	.subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT,
	557	.cb_count = IPCTNL_MSG_TIMEOUT_MAX,
	558	.cb = cttimeout_cb,
	559	};
	560
	561	MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);
	562
19576c94 PN	563	static int __net_init cttimeout_net_init(struct net *net)
	564	{
	565	INIT_LIST_HEAD(&net->nfct_timeout_list);
	566
	567	return 0;
	568	}
	569
	570	static void __net_exit cttimeout_net_exit(struct net *net)
	571	{
	572	struct ctnl_timeout cur, tmp;
	573
84657984	574	nf_ct_unconfirmed_destroy(net);
19576c94 PN	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);