[linux.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/nospec.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;
	req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX);

	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>
66b51b0a	13	#include <linux/nospec.h>
8ef874bf PE	14
	15	#include <linux/inet_diag.h>
	16	#include <linux/sock_diag.h>
	17
8dcf01fc	18	static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
8ef874bf PE	19	static int (inet_rcv_compat)(struct sk_buff skb, struct nlmsghdr *nlh);
8ef874bf PE	20	static DEFINE_MUTEX(sock_diag_table_mutex);
eb4cb008	21	static struct workqueue_struct *broadcast_wq;
8ef874bf	22
91b8270f	23	u64 sock_gen_cookie(struct sock *sk)
f65c1b53	24	{
33cf7c90 ED	25	while (1) {
	26	u64 res = atomic64_read(&sk->sk_cookie);
	27
	28	if (res)
	29	return res;
	30	res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
	31	atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	32	}
	33	}
	34
	35	int sock_diag_check_cookie(struct sock sk, const __u32 cookie)
	36	{
	37	u64 res;
	38
	39	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
f65c1b53	40	return 0;
33cf7c90 ED	41
	42	res = sock_gen_cookie(sk);
	43	if ((u32)res != cookie[0] \|\| (u32)(res >> 32) != cookie[1])
	44	return -ESTALE;
	45
	46	return 0;
f65c1b53 PE	47	}
	48	EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
	49
33cf7c90	50	void sock_diag_save_cookie(struct sock sk, __u32 cookie)
f65c1b53	51	{
33cf7c90 ED	52	u64 res = sock_gen_cookie(sk);
	53
	54	cookie[0] = (u32)res;
	55	cookie[1] = (u32)(res >> 32);
f65c1b53 PE	56	}
	57	EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
	58
5d2e5f27 PE	59	int sock_diag_put_meminfo(struct sock sk, struct sk_buff skb, int attrtype)
5d2e5f27 PE	60	{
7b46866d	61	u32 mem[SK_MEMINFO_VARS];
5d2e5f27	62
a2d133b1	63	sk_get_meminfo(sk, mem);
5d2e5f27	64
7b46866d	65	return nla_put(skb, attrtype, sizeof(mem), &mem);
5d2e5f27 PE	66	}
	67	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	68
a53b72c8	69	int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
e8d9612c ND	70	struct sk_buff *skb, int attrtype)
e8d9612c ND	71	{
a3ea269b	72	struct sock_fprog_kern *fprog;
e8d9612c	73	struct sk_filter *filter;
a3ea269b DB	74	struct nlattr *attr;
a3ea269b DB	75	unsigned int flen;
e8d9612c ND	76	int err = 0;
e8d9612c ND	77
a53b72c8	78	if (!may_report_filterinfo) {
e8d9612c ND	79	nla_reserve(skb, attrtype, 0);
	80	return 0;
	81	}
	82
	83	rcu_read_lock();
e8d9612c	84	filter = rcu_dereference(sk->sk_filter);
a3ea269b DB	85	if (!filter)
a3ea269b DB	86	goto out;
e8d9612c	87
7ae457c1	88	fprog = filter->prog->orig_prog;
b382c086 DB	89	if (!fprog)
	90	goto out;
	91
009937e7	92	flen = bpf_classic_proglen(fprog);
a3ea269b DB	93
a3ea269b DB	94	attr = nla_reserve(skb, attrtype, flen);
e8d9612c ND	95	if (attr == NULL) {
	96	err = -EMSGSIZE;
	97	goto out;
	98	}
	99
a3ea269b	100	memcpy(nla_data(attr), fprog->filter, flen);
e8d9612c ND	101	out:
	102	rcu_read_unlock();
	103	return err;
	104	}
	105	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	106
eb4cb008 CG	107	struct broadcast_sk {
	108	struct sock *sk;
	109	struct work_struct work;
	110	};
	111
	112	static size_t sock_diag_nlmsg_size(void)
	113	{
	114	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
	115	+ nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
6ed46d12	116	+ nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
eb4cb008 CG	117	}
	118
	119	static void sock_diag_broadcast_destroy_work(struct work_struct *work)
	120	{
	121	struct broadcast_sk *bsk =
	122	container_of(work, struct broadcast_sk, work);
	123	struct sock *sk = bsk->sk;
	124	const struct sock_diag_handler *hndl;
	125	struct sk_buff *skb;
	126	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
	127	int err = -1;
	128
	129	WARN_ON(group == SKNLGRP_NONE);
	130
	131	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
	132	if (!skb)
	133	goto out;
	134
	135	mutex_lock(&sock_diag_table_mutex);
	136	hndl = sock_diag_handlers[sk->sk_family];
	137	if (hndl && hndl->get_info)
	138	err = hndl->get_info(skb, sk);
	139	mutex_unlock(&sock_diag_table_mutex);
	140
	141	if (!err)
	142	nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
	143	GFP_KERNEL);
	144	else
	145	kfree_skb(skb);
	146	out:
	147	sk_destruct(sk);
	148	kfree(bsk);
	149	}
	150
	151	void sock_diag_broadcast_destroy(struct sock *sk)
	152	{
	153	/* Note, this function is often called from an interrupt context. */
	154	struct broadcast_sk *bsk =
	155	kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
	156	if (!bsk)
	157	return sk_destruct(sk);
	158	bsk->sk = sk;
	159	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
	160	queue_work(broadcast_wq, &bsk->work);
	161	}
	162
8ef874bf PE	163	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	164	{
	165	mutex_lock(&sock_diag_table_mutex);
	166	inet_rcv_compat = fn;
	167	mutex_unlock(&sock_diag_table_mutex);
	168	}
	169	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	170
	171	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	172	{
	173	mutex_lock(&sock_diag_table_mutex);
	174	inet_rcv_compat = NULL;
	175	mutex_unlock(&sock_diag_table_mutex);
	176	}
	177	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	178
8dcf01fc	179	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	180	{
	181	int err = 0;
	182
6f8e4ad0	183	if (hndl->family >= AF_MAX)
8ef874bf PE	184	return -EINVAL;
	185
	186	mutex_lock(&sock_diag_table_mutex);
	187	if (sock_diag_handlers[hndl->family])
	188	err = -EBUSY;
	189	else
	190	sock_diag_handlers[hndl->family] = hndl;
	191	mutex_unlock(&sock_diag_table_mutex);
	192
	193	return err;
	194	}
	195	EXPORT_SYMBOL_GPL(sock_diag_register);
	196
8dcf01fc	197	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	198	{
	199	int family = hnld->family;
	200
6f8e4ad0	201	if (family >= AF_MAX)
8ef874bf PE	202	return;
	203
	204	mutex_lock(&sock_diag_table_mutex);
	205	BUG_ON(sock_diag_handlers[family] != hnld);
	206	sock_diag_handlers[family] = NULL;
	207	mutex_unlock(&sock_diag_table_mutex);
	208	}
	209	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	210
64be0aed	211	static int __sock_diag_cmd(struct sk_buff skb, struct nlmsghdr nlh)
8ef874bf PE	212	{
8ef874bf PE	213	int err;
7b46866d	214	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	215	const struct sock_diag_handler *hndl;
8ef874bf PE	216
	217	if (nlmsg_len(nlh) < sizeof(*req))
	218	return -EINVAL;
	219
6e601a53 MK	220	if (req->sdiag_family >= AF_MAX)
6e601a53 MK	221	return -EINVAL;
66b51b0a	222	req->sdiag_family = array_index_nospec(req->sdiag_family, AF_MAX);
6e601a53	223
8e904550	224	if (sock_diag_handlers[req->sdiag_family] == NULL)
bf2ae2e4	225	sock_load_diag_module(req->sdiag_family, 0);
8e904550 MK	226
	227	mutex_lock(&sock_diag_table_mutex);
	228	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	229	if (hndl == NULL)
8ef874bf PE	230	err = -ENOENT;
64be0aed	231	else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
8ef874bf	232	err = hndl->dump(skb, nlh);
64be0aed LC	233	else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
	234	err = hndl->destroy(skb, nlh);
	235	else
	236	err = -EOPNOTSUPP;
8e904550	237	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	238
	239	return err;
	240	}
	241
2d4bc933 JB	242	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh,
2d4bc933 JB	243	struct netlink_ext_ack *extack)
8ef874bf PE	244	{
	245	int ret;
	246
	247	switch (nlh->nlmsg_type) {
	248	case TCPDIAG_GETSOCK:
	249	case DCCPDIAG_GETSOCK:
	250	if (inet_rcv_compat == NULL)
bf2ae2e4	251	sock_load_diag_module(AF_INET, 0);
8ef874bf PE	252
	253	mutex_lock(&sock_diag_table_mutex);
	254	if (inet_rcv_compat != NULL)
	255	ret = inet_rcv_compat(skb, nlh);
	256	else
	257	ret = -EOPNOTSUPP;
	258	mutex_unlock(&sock_diag_table_mutex);
	259
	260	return ret;
	261	case SOCK_DIAG_BY_FAMILY:
64be0aed LC	262	case SOCK_DESTROY:
64be0aed LC	263	return __sock_diag_cmd(skb, nlh);
8ef874bf PE	264	default:
	265	return -EINVAL;
	266	}
	267	}
	268
	269	static DEFINE_MUTEX(sock_diag_mutex);
	270
	271	static void sock_diag_rcv(struct sk_buff *skb)
	272	{
	273	mutex_lock(&sock_diag_mutex);
	274	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	275	mutex_unlock(&sock_diag_mutex);
	276	}
	277
eb4cb008 CG	278	static int sock_diag_bind(struct net *net, int group)
	279	{
	280	switch (group) {
	281	case SKNLGRP_INET_TCP_DESTROY:
	282	case SKNLGRP_INET_UDP_DESTROY:
	283	if (!sock_diag_handlers[AF_INET])
bf2ae2e4	284	sock_load_diag_module(AF_INET, 0);
eb4cb008 CG	285	break;
	286	case SKNLGRP_INET6_TCP_DESTROY:
	287	case SKNLGRP_INET6_UDP_DESTROY:
	288	if (!sock_diag_handlers[AF_INET6])
bf2ae2e4	289	sock_load_diag_module(AF_INET6, 0);
eb4cb008 CG	290	break;
	291	}
	292	return 0;
	293	}
	294
64be0aed LC	295	int sock_diag_destroy(struct sock *sk, int err)
	296	{
	297	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
	298	return -EPERM;
	299
	300	if (!sk->sk_prot->diag_destroy)
	301	return -EOPNOTSUPP;
	302
	303	return sk->sk_prot->diag_destroy(sk, err);
	304	}
	305	EXPORT_SYMBOL_GPL(sock_diag_destroy);
	306
51d7cccf	307	static int __net_init diag_net_init(struct net *net)
8ef874bf	308	{
a31f2d17	309	struct netlink_kernel_cfg cfg = {
eb4cb008	310	.groups = SKNLGRP_MAX,
a31f2d17	311	.input = sock_diag_rcv,
eb4cb008 CG	312	.bind = sock_diag_bind,
eb4cb008 CG	313	.flags = NL_CFG_F_NONROOT_RECV,
a31f2d17 PNA	314	};
a31f2d17 PNA	315
9f00d977	316	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	317	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	318	}
	319
	320	static void __net_exit diag_net_exit(struct net *net)
	321	{
	322	netlink_kernel_release(net->diag_nlsk);
	323	net->diag_nlsk = NULL;
	324	}
	325
	326	static struct pernet_operations diag_net_ops = {
	327	.init = diag_net_init,
	328	.exit = diag_net_exit,
	329	};
	330
	331	static int __init sock_diag_init(void)
	332	{
eb4cb008 CG	333	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
eb4cb008 CG	334	BUG_ON(!broadcast_wq);
51d7cccf	335	return register_pernet_subsys(&diag_net_ops);
8ef874bf	336	}
b6191aee	337	device_initcall(sock_diag_init);