[deliverable/linux.git] / net / core / sock_diag.c

#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;

static 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];

	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;

	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(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_rcv_msg(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)
		request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				NETLINK_SOCK_DIAG, req->sdiag_family);

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

	return err;
}

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

	switch (nlh->nlmsg_type) {
	case TCPDIAG_GETSOCK:
	case DCCPDIAG_GETSOCK:
		if (inet_rcv_compat == NULL)
			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
					NETLINK_SOCK_DIAG, AF_INET);

		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:
		return __sock_diag_rcv_msg(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])
			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				       NETLINK_SOCK_DIAG, AF_INET);
		break;
	case SKNLGRP_INET6_TCP_DESTROY:
	case SKNLGRP_INET6_UDP_DESTROY:
		if (!sock_diag_handlers[AF_INET6])
			request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				       NETLINK_SOCK_DIAG, AF_INET);
		break;
	}
	return 0;
}

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);
}

static void __exit sock_diag_exit(void)
{
	unregister_pernet_subsys(&diag_net_ops);
	destroy_workqueue(broadcast_wq);
}

module_init(sock_diag_init);
module_exit(sock_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);
Commit	Line	Data
8ef874bf PE	1	#include <linux/mutex.h>
	2	#include <linux/socket.h>
	3	#include <linux/skbuff.h>
	4	#include <net/netlink.h>
	5	#include <net/net_namespace.h>
	6	#include <linux/module.h>
5d2e5f27	7	#include <net/sock.h>
eb4cb008 CG	8	#include <linux/kernel.h>
	9	#include <linux/tcp.h>
	10	#include <linux/workqueue.h>
8ef874bf PE	11
	12	#include <linux/inet_diag.h>
	13	#include <linux/sock_diag.h>
	14
8dcf01fc	15	static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
8ef874bf PE	16	static int (inet_rcv_compat)(struct sk_buff skb, struct nlmsghdr *nlh);
8ef874bf PE	17	static DEFINE_MUTEX(sock_diag_table_mutex);
eb4cb008	18	static struct workqueue_struct *broadcast_wq;
8ef874bf	19
33cf7c90	20	static u64 sock_gen_cookie(struct sock *sk)
f65c1b53	21	{
33cf7c90 ED	22	while (1) {
	23	u64 res = atomic64_read(&sk->sk_cookie);
	24
	25	if (res)
	26	return res;
	27	res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
	28	atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	29	}
	30	}
	31
	32	int sock_diag_check_cookie(struct sock sk, const __u32 cookie)
	33	{
	34	u64 res;
	35
	36	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
f65c1b53	37	return 0;
33cf7c90 ED	38
	39	res = sock_gen_cookie(sk);
	40	if ((u32)res != cookie[0] \|\| (u32)(res >> 32) != cookie[1])
	41	return -ESTALE;
	42
	43	return 0;
f65c1b53 PE	44	}
	45	EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
	46
33cf7c90	47	void sock_diag_save_cookie(struct sock sk, __u32 cookie)
f65c1b53	48	{
33cf7c90 ED	49	u64 res = sock_gen_cookie(sk);
	50
	51	cookie[0] = (u32)res;
	52	cookie[1] = (u32)(res >> 32);
f65c1b53 PE	53	}
	54	EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
	55
5d2e5f27 PE	56	int sock_diag_put_meminfo(struct sock sk, struct sk_buff skb, int attrtype)
5d2e5f27 PE	57	{
7b46866d	58	u32 mem[SK_MEMINFO_VARS];
5d2e5f27 PE	59
	60	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	61	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	62	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	63	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	64	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	65	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	66	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
d594e987	67	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
5d2e5f27	68
7b46866d	69	return nla_put(skb, attrtype, sizeof(mem), &mem);
5d2e5f27 PE	70	}
	71	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	72
a53b72c8	73	int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
e8d9612c ND	74	struct sk_buff *skb, int attrtype)
e8d9612c ND	75	{
a3ea269b	76	struct sock_fprog_kern *fprog;
e8d9612c	77	struct sk_filter *filter;
a3ea269b DB	78	struct nlattr *attr;
a3ea269b DB	79	unsigned int flen;
e8d9612c ND	80	int err = 0;
e8d9612c ND	81
a53b72c8	82	if (!may_report_filterinfo) {
e8d9612c ND	83	nla_reserve(skb, attrtype, 0);
	84	return 0;
	85	}
	86
	87	rcu_read_lock();
e8d9612c	88	filter = rcu_dereference(sk->sk_filter);
a3ea269b DB	89	if (!filter)
a3ea269b DB	90	goto out;
e8d9612c	91
7ae457c1	92	fprog = filter->prog->orig_prog;
b382c086 DB	93	if (!fprog)
	94	goto out;
	95
009937e7	96	flen = bpf_classic_proglen(fprog);
a3ea269b DB	97
a3ea269b DB	98	attr = nla_reserve(skb, attrtype, flen);
e8d9612c ND	99	if (attr == NULL) {
	100	err = -EMSGSIZE;
	101	goto out;
	102	}
	103
a3ea269b	104	memcpy(nla_data(attr), fprog->filter, flen);
e8d9612c ND	105	out:
	106	rcu_read_unlock();
	107	return err;
	108	}
	109	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	110
eb4cb008 CG	111	struct broadcast_sk {
	112	struct sock *sk;
	113	struct work_struct work;
	114	};
	115
	116	static size_t sock_diag_nlmsg_size(void)
	117	{
	118	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
	119	+ nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
	120	+ nla_total_size(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
	121	}
	122
	123	static void sock_diag_broadcast_destroy_work(struct work_struct *work)
	124	{
	125	struct broadcast_sk *bsk =
	126	container_of(work, struct broadcast_sk, work);
	127	struct sock *sk = bsk->sk;
	128	const struct sock_diag_handler *hndl;
	129	struct sk_buff *skb;
	130	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
	131	int err = -1;
	132
	133	WARN_ON(group == SKNLGRP_NONE);
	134
	135	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
	136	if (!skb)
	137	goto out;
	138
	139	mutex_lock(&sock_diag_table_mutex);
	140	hndl = sock_diag_handlers[sk->sk_family];
	141	if (hndl && hndl->get_info)
	142	err = hndl->get_info(skb, sk);
	143	mutex_unlock(&sock_diag_table_mutex);
	144
	145	if (!err)
	146	nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
	147	GFP_KERNEL);
	148	else
	149	kfree_skb(skb);
	150	out:
	151	sk_destruct(sk);
	152	kfree(bsk);
	153	}
	154
	155	void sock_diag_broadcast_destroy(struct sock *sk)
	156	{
	157	/* Note, this function is often called from an interrupt context. */
	158	struct broadcast_sk *bsk =
	159	kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
	160	if (!bsk)
	161	return sk_destruct(sk);
	162	bsk->sk = sk;
	163	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
	164	queue_work(broadcast_wq, &bsk->work);
	165	}
	166
8ef874bf PE	167	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	168	{
	169	mutex_lock(&sock_diag_table_mutex);
	170	inet_rcv_compat = fn;
	171	mutex_unlock(&sock_diag_table_mutex);
	172	}
	173	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	174
	175	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	176	{
	177	mutex_lock(&sock_diag_table_mutex);
	178	inet_rcv_compat = NULL;
	179	mutex_unlock(&sock_diag_table_mutex);
	180	}
	181	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	182
8dcf01fc	183	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	184	{
	185	int err = 0;
	186
6f8e4ad0	187	if (hndl->family >= AF_MAX)
8ef874bf PE	188	return -EINVAL;
	189
	190	mutex_lock(&sock_diag_table_mutex);
	191	if (sock_diag_handlers[hndl->family])
	192	err = -EBUSY;
	193	else
	194	sock_diag_handlers[hndl->family] = hndl;
	195	mutex_unlock(&sock_diag_table_mutex);
	196
	197	return err;
	198	}
	199	EXPORT_SYMBOL_GPL(sock_diag_register);
	200
8dcf01fc	201	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	202	{
	203	int family = hnld->family;
	204
6f8e4ad0	205	if (family >= AF_MAX)
8ef874bf PE	206	return;
	207
	208	mutex_lock(&sock_diag_table_mutex);
	209	BUG_ON(sock_diag_handlers[family] != hnld);
	210	sock_diag_handlers[family] = NULL;
	211	mutex_unlock(&sock_diag_table_mutex);
	212	}
	213	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	214
8ef874bf PE	215	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	216	{
	217	int err;
7b46866d	218	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	219	const struct sock_diag_handler *hndl;
8ef874bf PE	220
	221	if (nlmsg_len(nlh) < sizeof(*req))
	222	return -EINVAL;
	223
6e601a53 MK	224	if (req->sdiag_family >= AF_MAX)
	225	return -EINVAL;
	226
8e904550 MK	227	if (sock_diag_handlers[req->sdiag_family] == NULL)
	228	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	229	NETLINK_SOCK_DIAG, req->sdiag_family);
	230
	231	mutex_lock(&sock_diag_table_mutex);
	232	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	233	if (hndl == NULL)
	234	err = -ENOENT;
	235	else
	236	err = hndl->dump(skb, nlh);
8e904550	237	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	238
	239	return err;
	240	}
	241
	242	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	243	{
	244	int ret;
	245
	246	switch (nlh->nlmsg_type) {
	247	case TCPDIAG_GETSOCK:
	248	case DCCPDIAG_GETSOCK:
	249	if (inet_rcv_compat == NULL)
	250	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	251	NETLINK_SOCK_DIAG, AF_INET);
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:
	262	return __sock_diag_rcv_msg(skb, nlh);
	263	default:
	264	return -EINVAL;
	265	}
	266	}
	267
	268	static DEFINE_MUTEX(sock_diag_mutex);
	269
	270	static void sock_diag_rcv(struct sk_buff *skb)
	271	{
	272	mutex_lock(&sock_diag_mutex);
	273	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	274	mutex_unlock(&sock_diag_mutex);
	275	}
	276
eb4cb008 CG	277	static int sock_diag_bind(struct net *net, int group)
	278	{
	279	switch (group) {
	280	case SKNLGRP_INET_TCP_DESTROY:
	281	case SKNLGRP_INET_UDP_DESTROY:
	282	if (!sock_diag_handlers[AF_INET])
	283	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	284	NETLINK_SOCK_DIAG, AF_INET);
	285	break;
	286	case SKNLGRP_INET6_TCP_DESTROY:
	287	case SKNLGRP_INET6_UDP_DESTROY:
	288	if (!sock_diag_handlers[AF_INET6])
	289	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	290	NETLINK_SOCK_DIAG, AF_INET);
	291	break;
	292	}
	293	return 0;
	294	}
	295
51d7cccf	296	static int __net_init diag_net_init(struct net *net)
8ef874bf	297	{
a31f2d17	298	struct netlink_kernel_cfg cfg = {
eb4cb008	299	.groups = SKNLGRP_MAX,
a31f2d17	300	.input = sock_diag_rcv,
eb4cb008 CG	301	.bind = sock_diag_bind,
eb4cb008 CG	302	.flags = NL_CFG_F_NONROOT_RECV,
a31f2d17 PNA	303	};
a31f2d17 PNA	304
9f00d977	305	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	306	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	307	}
	308
	309	static void __net_exit diag_net_exit(struct net *net)
	310	{
	311	netlink_kernel_release(net->diag_nlsk);
	312	net->diag_nlsk = NULL;
	313	}
	314
	315	static struct pernet_operations diag_net_ops = {
	316	.init = diag_net_init,
	317	.exit = diag_net_exit,
	318	};
	319
	320	static int __init sock_diag_init(void)
	321	{
eb4cb008 CG	322	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
eb4cb008 CG	323	BUG_ON(!broadcast_wq);
51d7cccf	324	return register_pernet_subsys(&diag_net_ops);
8ef874bf PE	325	}
	326
	327	static void __exit sock_diag_exit(void)
	328	{
51d7cccf	329	unregister_pernet_subsys(&diag_net_ops);
eb4cb008	330	destroy_workqueue(broadcast_wq);
8ef874bf PE	331	}
	332
	333	module_init(sock_diag_init);
	334	module_exit(sock_diag_exit);
	335	MODULE_LICENSE("GPL");
	336	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);