[linux-2.6-block.git] / net / core / sock_diag.c

/* License: GPL */

#include <linux/mutex.h>
#include <linux/socket.h>
#include <linux/skbuff.h>
#include <net/netlink.h>
#include <net/net_namespace.h>
#include <linux/module.h>
#include <net/sock.h>
#include <linux/kernel.h>
#include <linux/tcp.h>
#include <linux/workqueue.h>

#include <linux/inet_diag.h>
#include <linux/sock_diag.h>

static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
static DEFINE_MUTEX(sock_diag_table_mutex);
static struct workqueue_struct *broadcast_wq;

u64 sock_gen_cookie(struct sock *sk)
{
	while (1) {
		u64 res = atomic64_read(&sk->sk_cookie);

		if (res)
			return res;
		res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
		atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	}
}

int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
{
	u64 res;

	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
		return 0;

	res = sock_gen_cookie(sk);
	if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
		return -ESTALE;

	return 0;
}
EXPORT_SYMBOL_GPL(sock_diag_check_cookie);

void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
{
	u64 res = sock_gen_cookie(sk);

	cookie[0] = (u32)res;
	cookie[1] = (u32)(res >> 32);
}
EXPORT_SYMBOL_GPL(sock_diag_save_cookie);

int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
{
	u32 mem[SK_MEMINFO_VARS];

	sk_get_meminfo(sk, mem);

	return nla_put(skb, attrtype, sizeof(mem), &mem);
}
EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);

int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
			     struct sk_buff *skb, int attrtype)
{
	struct sock_fprog_kern *fprog;
	struct sk_filter *filter;
	struct nlattr *attr;
	unsigned int flen;
	int err = 0;

	if (!may_report_filterinfo) {
		nla_reserve(skb, attrtype, 0);
		return 0;
	}

	rcu_read_lock();
	filter = rcu_dereference(sk->sk_filter);
	if (!filter)
		goto out;

	fprog = filter->prog->orig_prog;
	if (!fprog)
		goto out;

	flen = bpf_classic_proglen(fprog);

	attr = nla_reserve(skb, attrtype, flen);
	if (attr == NULL) {
		err = -EMSGSIZE;
		goto out;
	}

	memcpy(nla_data(attr), fprog->filter, flen);
out:
	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(sock_diag_put_filterinfo);

struct broadcast_sk {
	struct sock *sk;
	struct work_struct work;
};

static size_t sock_diag_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
	       + nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
	       + nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
}

static void sock_diag_broadcast_destroy_work(struct work_struct *work)
{
	struct broadcast_sk *bsk =
		container_of(work, struct broadcast_sk, work);
	struct sock *sk = bsk->sk;
	const struct sock_diag_handler *hndl;
	struct sk_buff *skb;
	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
	int err = -1;

	WARN_ON(group == SKNLGRP_NONE);

	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
	if (!skb)
		goto out;

	mutex_lock(&sock_diag_table_mutex);
	hndl = sock_diag_handlers[sk->sk_family];
	if (hndl && hndl->get_info)
		err = hndl->get_info(skb, sk);
	mutex_unlock(&sock_diag_table_mutex);

	if (!err)
		nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
				GFP_KERNEL);
	else
		kfree_skb(skb);
out:
	sk_destruct(sk);
	kfree(bsk);
}

void sock_diag_broadcast_destroy(struct sock *sk)
{
	/* Note, this function is often called from an interrupt context. */
	struct broadcast_sk *bsk =
		kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
	if (!bsk)
		return sk_destruct(sk);
	bsk->sk = sk;
	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
	queue_work(broadcast_wq, &bsk->work);
}

void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
{
	mutex_lock(&sock_diag_table_mutex);
	inet_rcv_compat = fn;
	mutex_unlock(&sock_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);

void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
{
	mutex_lock(&sock_diag_table_mutex);
	inet_rcv_compat = NULL;
	mutex_unlock(&sock_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);

int sock_diag_register(const struct sock_diag_handler *hndl)
{
	int err = 0;

	if (hndl->family >= AF_MAX)
		return -EINVAL;

	mutex_lock(&sock_diag_table_mutex);
	if (sock_diag_handlers[hndl->family])
		err = -EBUSY;
	else
		sock_diag_handlers[hndl->family] = hndl;
	mutex_unlock(&sock_diag_table_mutex);

	return err;
}
EXPORT_SYMBOL_GPL(sock_diag_register);

void sock_diag_unregister(const struct sock_diag_handler *hnld)
{
	int family = hnld->family;

	if (family >= AF_MAX)
		return;

	mutex_lock(&sock_diag_table_mutex);
	BUG_ON(sock_diag_handlers[family] != hnld);
	sock_diag_handlers[family] = NULL;
	mutex_unlock(&sock_diag_table_mutex);
}
EXPORT_SYMBOL_GPL(sock_diag_unregister);

static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	int err;
	struct sock_diag_req *req = nlmsg_data(nlh);
	const struct sock_diag_handler *hndl;

	if (nlmsg_len(nlh) < sizeof(*req))
		return -EINVAL;

	if (req->sdiag_family >= AF_MAX)
		return -EINVAL;

	if (sock_diag_handlers[req->sdiag_family] == NULL)
		sock_load_diag_module(req->sdiag_family, 0);

	mutex_lock(&sock_diag_table_mutex);
	hndl = sock_diag_handlers[req->sdiag_family];
	if (hndl == NULL)
		err = -ENOENT;
	else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
		err = hndl->dump(skb, nlh);
	else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
		err = hndl->destroy(skb, nlh);
	else
		err = -EOPNOTSUPP;
	mutex_unlock(&sock_diag_table_mutex);

	return err;
}

static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
			     struct netlink_ext_ack *extack)
{
	int ret;

	switch (nlh->nlmsg_type) {
	case TCPDIAG_GETSOCK:
	case DCCPDIAG_GETSOCK:
		if (inet_rcv_compat == NULL)
			sock_load_diag_module(AF_INET, 0);

		mutex_lock(&sock_diag_table_mutex);
		if (inet_rcv_compat != NULL)
			ret = inet_rcv_compat(skb, nlh);
		else
			ret = -EOPNOTSUPP;
		mutex_unlock(&sock_diag_table_mutex);

		return ret;
	case SOCK_DIAG_BY_FAMILY:
	case SOCK_DESTROY:
		return __sock_diag_cmd(skb, nlh);
	default:
		return -EINVAL;
	}
}

static DEFINE_MUTEX(sock_diag_mutex);

static void sock_diag_rcv(struct sk_buff *skb)
{
	mutex_lock(&sock_diag_mutex);
	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	mutex_unlock(&sock_diag_mutex);
}

static int sock_diag_bind(struct net *net, int group)
{
	switch (group) {
	case SKNLGRP_INET_TCP_DESTROY:
	case SKNLGRP_INET_UDP_DESTROY:
		if (!sock_diag_handlers[AF_INET])
			sock_load_diag_module(AF_INET, 0);
		break;
	case SKNLGRP_INET6_TCP_DESTROY:
	case SKNLGRP_INET6_UDP_DESTROY:
		if (!sock_diag_handlers[AF_INET6])
			sock_load_diag_module(AF_INET6, 0);
		break;
	}
	return 0;
}

int sock_diag_destroy(struct sock *sk, int err)
{
	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	if (!sk->sk_prot->diag_destroy)
		return -EOPNOTSUPP;

	return sk->sk_prot->diag_destroy(sk, err);
}
EXPORT_SYMBOL_GPL(sock_diag_destroy);

static int __net_init diag_net_init(struct net *net)
{
	struct netlink_kernel_cfg cfg = {
		.groups	= SKNLGRP_MAX,
		.input	= sock_diag_rcv,
		.bind	= sock_diag_bind,
		.flags	= NL_CFG_F_NONROOT_RECV,
	};

	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
	return net->diag_nlsk == NULL ? -ENOMEM : 0;
}

static void __net_exit diag_net_exit(struct net *net)
{
	netlink_kernel_release(net->diag_nlsk);
	net->diag_nlsk = NULL;
}

static struct pernet_operations diag_net_ops = {
	.init = diag_net_init,
	.exit = diag_net_exit,
};

static int __init sock_diag_init(void)
{
	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
	BUG_ON(!broadcast_wq);
	return register_pernet_subsys(&diag_net_ops);
}
device_initcall(sock_diag_init);
Commit	Line	Data
b6191aee PG	1	/* License: GPL */
b6191aee PG	2
8ef874bf PE	3	#include <linux/mutex.h>
	4	#include <linux/socket.h>
	5	#include <linux/skbuff.h>
	6	#include <net/netlink.h>
	7	#include <net/net_namespace.h>
	8	#include <linux/module.h>
5d2e5f27	9	#include <net/sock.h>
eb4cb008 CG	10	#include <linux/kernel.h>
	11	#include <linux/tcp.h>
	12	#include <linux/workqueue.h>
8ef874bf PE	13
	14	#include <linux/inet_diag.h>
	15	#include <linux/sock_diag.h>
	16
8dcf01fc	17	static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
8ef874bf PE	18	static int (inet_rcv_compat)(struct sk_buff skb, struct nlmsghdr *nlh);
8ef874bf PE	19	static DEFINE_MUTEX(sock_diag_table_mutex);
eb4cb008	20	static struct workqueue_struct *broadcast_wq;
8ef874bf	21
91b8270f	22	u64 sock_gen_cookie(struct sock *sk)
f65c1b53	23	{
33cf7c90 ED	24	while (1) {
	25	u64 res = atomic64_read(&sk->sk_cookie);
	26
	27	if (res)
	28	return res;
	29	res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
	30	atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	31	}
	32	}
	33
	34	int sock_diag_check_cookie(struct sock sk, const __u32 cookie)
	35	{
	36	u64 res;
	37
	38	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
f65c1b53	39	return 0;
33cf7c90 ED	40
	41	res = sock_gen_cookie(sk);
	42	if ((u32)res != cookie[0] \|\| (u32)(res >> 32) != cookie[1])
	43	return -ESTALE;
	44
	45	return 0;
f65c1b53 PE	46	}
	47	EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
	48
33cf7c90	49	void sock_diag_save_cookie(struct sock sk, __u32 cookie)
f65c1b53	50	{
33cf7c90 ED	51	u64 res = sock_gen_cookie(sk);
	52
	53	cookie[0] = (u32)res;
	54	cookie[1] = (u32)(res >> 32);
f65c1b53 PE	55	}
	56	EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
	57
5d2e5f27 PE	58	int sock_diag_put_meminfo(struct sock sk, struct sk_buff skb, int attrtype)
5d2e5f27 PE	59	{
7b46866d	60	u32 mem[SK_MEMINFO_VARS];
5d2e5f27	61
a2d133b1	62	sk_get_meminfo(sk, mem);
5d2e5f27	63
7b46866d	64	return nla_put(skb, attrtype, sizeof(mem), &mem);
5d2e5f27 PE	65	}
	66	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	67
a53b72c8	68	int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
e8d9612c ND	69	struct sk_buff *skb, int attrtype)
e8d9612c ND	70	{
a3ea269b	71	struct sock_fprog_kern *fprog;
e8d9612c	72	struct sk_filter *filter;
a3ea269b DB	73	struct nlattr *attr;
a3ea269b DB	74	unsigned int flen;
e8d9612c ND	75	int err = 0;
e8d9612c ND	76
a53b72c8	77	if (!may_report_filterinfo) {
e8d9612c ND	78	nla_reserve(skb, attrtype, 0);
	79	return 0;
	80	}
	81
	82	rcu_read_lock();
e8d9612c	83	filter = rcu_dereference(sk->sk_filter);
a3ea269b DB	84	if (!filter)
a3ea269b DB	85	goto out;
e8d9612c	86
7ae457c1	87	fprog = filter->prog->orig_prog;
b382c086 DB	88	if (!fprog)
	89	goto out;
	90
009937e7	91	flen = bpf_classic_proglen(fprog);
a3ea269b DB	92
a3ea269b DB	93	attr = nla_reserve(skb, attrtype, flen);
e8d9612c ND	94	if (attr == NULL) {
	95	err = -EMSGSIZE;
	96	goto out;
	97	}
	98
a3ea269b	99	memcpy(nla_data(attr), fprog->filter, flen);
e8d9612c ND	100	out:
	101	rcu_read_unlock();
	102	return err;
	103	}
	104	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	105
eb4cb008 CG	106	struct broadcast_sk {
	107	struct sock *sk;
	108	struct work_struct work;
	109	};
	110
	111	static size_t sock_diag_nlmsg_size(void)
	112	{
	113	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
	114	+ nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
6ed46d12	115	+ nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
eb4cb008 CG	116	}
	117
	118	static void sock_diag_broadcast_destroy_work(struct work_struct *work)
	119	{
	120	struct broadcast_sk *bsk =
	121	container_of(work, struct broadcast_sk, work);
	122	struct sock *sk = bsk->sk;
	123	const struct sock_diag_handler *hndl;
	124	struct sk_buff *skb;
	125	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
	126	int err = -1;
	127
	128	WARN_ON(group == SKNLGRP_NONE);
	129
	130	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
	131	if (!skb)
	132	goto out;
	133
	134	mutex_lock(&sock_diag_table_mutex);
	135	hndl = sock_diag_handlers[sk->sk_family];
	136	if (hndl && hndl->get_info)
	137	err = hndl->get_info(skb, sk);
	138	mutex_unlock(&sock_diag_table_mutex);
	139
	140	if (!err)
	141	nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
	142	GFP_KERNEL);
	143	else
	144	kfree_skb(skb);
	145	out:
	146	sk_destruct(sk);
	147	kfree(bsk);
	148	}
	149
	150	void sock_diag_broadcast_destroy(struct sock *sk)
	151	{
	152	/* Note, this function is often called from an interrupt context. */
	153	struct broadcast_sk *bsk =
	154	kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
	155	if (!bsk)
	156	return sk_destruct(sk);
	157	bsk->sk = sk;
	158	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
	159	queue_work(broadcast_wq, &bsk->work);
	160	}
	161
8ef874bf PE	162	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	163	{
	164	mutex_lock(&sock_diag_table_mutex);
	165	inet_rcv_compat = fn;
	166	mutex_unlock(&sock_diag_table_mutex);
	167	}
	168	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	169
	170	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	171	{
	172	mutex_lock(&sock_diag_table_mutex);
	173	inet_rcv_compat = NULL;
	174	mutex_unlock(&sock_diag_table_mutex);
	175	}
	176	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	177
8dcf01fc	178	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	179	{
	180	int err = 0;
	181
6f8e4ad0	182	if (hndl->family >= AF_MAX)
8ef874bf PE	183	return -EINVAL;
	184
	185	mutex_lock(&sock_diag_table_mutex);
	186	if (sock_diag_handlers[hndl->family])
	187	err = -EBUSY;
	188	else
	189	sock_diag_handlers[hndl->family] = hndl;
	190	mutex_unlock(&sock_diag_table_mutex);
	191
	192	return err;
	193	}
	194	EXPORT_SYMBOL_GPL(sock_diag_register);
	195
8dcf01fc	196	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	197	{
	198	int family = hnld->family;
	199
6f8e4ad0	200	if (family >= AF_MAX)
8ef874bf PE	201	return;
	202
	203	mutex_lock(&sock_diag_table_mutex);
	204	BUG_ON(sock_diag_handlers[family] != hnld);
	205	sock_diag_handlers[family] = NULL;
	206	mutex_unlock(&sock_diag_table_mutex);
	207	}
	208	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	209
64be0aed	210	static int __sock_diag_cmd(struct sk_buff skb, struct nlmsghdr nlh)
8ef874bf PE	211	{
8ef874bf PE	212	int err;
7b46866d	213	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	214	const struct sock_diag_handler *hndl;
8ef874bf PE	215
	216	if (nlmsg_len(nlh) < sizeof(*req))
	217	return -EINVAL;
	218
6e601a53 MK	219	if (req->sdiag_family >= AF_MAX)
	220	return -EINVAL;
	221
8e904550	222	if (sock_diag_handlers[req->sdiag_family] == NULL)
bf2ae2e4	223	sock_load_diag_module(req->sdiag_family, 0);
8e904550 MK	224
	225	mutex_lock(&sock_diag_table_mutex);
	226	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	227	if (hndl == NULL)
8ef874bf PE	228	err = -ENOENT;
64be0aed	229	else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
8ef874bf	230	err = hndl->dump(skb, nlh);
64be0aed LC	231	else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
	232	err = hndl->destroy(skb, nlh);
	233	else
	234	err = -EOPNOTSUPP;
8e904550	235	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	236
	237	return err;
	238	}
	239
2d4bc933 JB	240	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	241	struct netlink_ext_ack *extack)
8ef874bf PE	242	{
	243	int ret;
	244
	245	switch (nlh->nlmsg_type) {
	246	case TCPDIAG_GETSOCK:
	247	case DCCPDIAG_GETSOCK:
	248	if (inet_rcv_compat == NULL)
bf2ae2e4	249	sock_load_diag_module(AF_INET, 0);
8ef874bf PE	250
	251	mutex_lock(&sock_diag_table_mutex);
	252	if (inet_rcv_compat != NULL)
	253	ret = inet_rcv_compat(skb, nlh);
	254	else
	255	ret = -EOPNOTSUPP;
	256	mutex_unlock(&sock_diag_table_mutex);
	257
	258	return ret;
	259	case SOCK_DIAG_BY_FAMILY:
64be0aed LC	260	case SOCK_DESTROY:
64be0aed LC	261	return __sock_diag_cmd(skb, nlh);
8ef874bf PE	262	default:
	263	return -EINVAL;
	264	}
	265	}
	266
	267	static DEFINE_MUTEX(sock_diag_mutex);
	268
	269	static void sock_diag_rcv(struct sk_buff *skb)
	270	{
	271	mutex_lock(&sock_diag_mutex);
	272	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	273	mutex_unlock(&sock_diag_mutex);
	274	}
	275
eb4cb008 CG	276	static int sock_diag_bind(struct net *net, int group)
	277	{
	278	switch (group) {
	279	case SKNLGRP_INET_TCP_DESTROY:
	280	case SKNLGRP_INET_UDP_DESTROY:
	281	if (!sock_diag_handlers[AF_INET])
bf2ae2e4	282	sock_load_diag_module(AF_INET, 0);
eb4cb008 CG	283	break;
	284	case SKNLGRP_INET6_TCP_DESTROY:
	285	case SKNLGRP_INET6_UDP_DESTROY:
	286	if (!sock_diag_handlers[AF_INET6])
bf2ae2e4	287	sock_load_diag_module(AF_INET6, 0);
eb4cb008 CG	288	break;
	289	}
	290	return 0;
	291	}
	292
64be0aed LC	293	int sock_diag_destroy(struct sock *sk, int err)
	294	{
	295	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
	296	return -EPERM;
	297
	298	if (!sk->sk_prot->diag_destroy)
	299	return -EOPNOTSUPP;
	300
	301	return sk->sk_prot->diag_destroy(sk, err);
	302	}
	303	EXPORT_SYMBOL_GPL(sock_diag_destroy);
	304
51d7cccf	305	static int __net_init diag_net_init(struct net *net)
8ef874bf	306	{
a31f2d17	307	struct netlink_kernel_cfg cfg = {
eb4cb008	308	.groups = SKNLGRP_MAX,
a31f2d17	309	.input = sock_diag_rcv,
eb4cb008 CG	310	.bind = sock_diag_bind,
eb4cb008 CG	311	.flags = NL_CFG_F_NONROOT_RECV,
a31f2d17 PNA	312	};
a31f2d17 PNA	313
9f00d977	314	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	315	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	316	}
	317
	318	static void __net_exit diag_net_exit(struct net *net)
	319	{
	320	netlink_kernel_release(net->diag_nlsk);
	321	net->diag_nlsk = NULL;
	322	}
	323
	324	static struct pernet_operations diag_net_ops = {
	325	.init = diag_net_init,
	326	.exit = diag_net_exit,
	327	};
	328
	329	static int __init sock_diag_init(void)
	330	{
eb4cb008 CG	331	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
eb4cb008 CG	332	BUG_ON(!broadcast_wq);
51d7cccf	333	return register_pernet_subsys(&diag_net_ops);
8ef874bf	334	}
b6191aee	335	device_initcall(sock_diag_init);