[mirror_ubuntu-zesty-kernel.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;

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;
	mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);

	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)
		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 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)
{
	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:
	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])
			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;
}

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
33cf7c90	22	static 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 PE	61
	62	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	63	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	64	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	65	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	66	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	67	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	68	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
d594e987	69	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
15239302	70	mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
5d2e5f27	71
7b46866d	72	return nla_put(skb, attrtype, sizeof(mem), &mem);
5d2e5f27 PE	73	}
	74	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	75
a53b72c8	76	int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
e8d9612c ND	77	struct sk_buff *skb, int attrtype)
e8d9612c ND	78	{
a3ea269b	79	struct sock_fprog_kern *fprog;
e8d9612c	80	struct sk_filter *filter;
a3ea269b DB	81	struct nlattr *attr;
a3ea269b DB	82	unsigned int flen;
e8d9612c ND	83	int err = 0;
e8d9612c ND	84
a53b72c8	85	if (!may_report_filterinfo) {
e8d9612c ND	86	nla_reserve(skb, attrtype, 0);
	87	return 0;
	88	}
	89
	90	rcu_read_lock();
e8d9612c	91	filter = rcu_dereference(sk->sk_filter);
a3ea269b DB	92	if (!filter)
a3ea269b DB	93	goto out;
e8d9612c	94
7ae457c1	95	fprog = filter->prog->orig_prog;
b382c086 DB	96	if (!fprog)
	97	goto out;
	98
009937e7	99	flen = bpf_classic_proglen(fprog);
a3ea269b DB	100
a3ea269b DB	101	attr = nla_reserve(skb, attrtype, flen);
e8d9612c ND	102	if (attr == NULL) {
	103	err = -EMSGSIZE;
	104	goto out;
	105	}
	106
a3ea269b	107	memcpy(nla_data(attr), fprog->filter, flen);
e8d9612c ND	108	out:
	109	rcu_read_unlock();
	110	return err;
	111	}
	112	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	113
eb4cb008 CG	114	struct broadcast_sk {
	115	struct sock *sk;
	116	struct work_struct work;
	117	};
	118
	119	static size_t sock_diag_nlmsg_size(void)
	120	{
	121	return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
	122	+ nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
6ed46d12	123	+ nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
eb4cb008 CG	124	}
	125
	126	static void sock_diag_broadcast_destroy_work(struct work_struct *work)
	127	{
	128	struct broadcast_sk *bsk =
	129	container_of(work, struct broadcast_sk, work);
	130	struct sock *sk = bsk->sk;
	131	const struct sock_diag_handler *hndl;
	132	struct sk_buff *skb;
	133	const enum sknetlink_groups group = sock_diag_destroy_group(sk);
	134	int err = -1;
	135
	136	WARN_ON(group == SKNLGRP_NONE);
	137
	138	skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
	139	if (!skb)
	140	goto out;
	141
	142	mutex_lock(&sock_diag_table_mutex);
	143	hndl = sock_diag_handlers[sk->sk_family];
	144	if (hndl && hndl->get_info)
	145	err = hndl->get_info(skb, sk);
	146	mutex_unlock(&sock_diag_table_mutex);
	147
	148	if (!err)
	149	nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
	150	GFP_KERNEL);
	151	else
	152	kfree_skb(skb);
	153	out:
	154	sk_destruct(sk);
	155	kfree(bsk);
	156	}
	157
	158	void sock_diag_broadcast_destroy(struct sock *sk)
	159	{
	160	/* Note, this function is often called from an interrupt context. */
	161	struct broadcast_sk *bsk =
	162	kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
	163	if (!bsk)
	164	return sk_destruct(sk);
	165	bsk->sk = sk;
	166	INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
	167	queue_work(broadcast_wq, &bsk->work);
	168	}
	169
8ef874bf PE	170	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	171	{
	172	mutex_lock(&sock_diag_table_mutex);
	173	inet_rcv_compat = fn;
	174	mutex_unlock(&sock_diag_table_mutex);
	175	}
	176	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	177
	178	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	179	{
	180	mutex_lock(&sock_diag_table_mutex);
	181	inet_rcv_compat = NULL;
	182	mutex_unlock(&sock_diag_table_mutex);
	183	}
	184	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	185
8dcf01fc	186	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	187	{
	188	int err = 0;
	189
6f8e4ad0	190	if (hndl->family >= AF_MAX)
8ef874bf PE	191	return -EINVAL;
	192
	193	mutex_lock(&sock_diag_table_mutex);
	194	if (sock_diag_handlers[hndl->family])
	195	err = -EBUSY;
	196	else
	197	sock_diag_handlers[hndl->family] = hndl;
	198	mutex_unlock(&sock_diag_table_mutex);
	199
	200	return err;
	201	}
	202	EXPORT_SYMBOL_GPL(sock_diag_register);
	203
8dcf01fc	204	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	205	{
	206	int family = hnld->family;
	207
6f8e4ad0	208	if (family >= AF_MAX)
8ef874bf PE	209	return;
	210
	211	mutex_lock(&sock_diag_table_mutex);
	212	BUG_ON(sock_diag_handlers[family] != hnld);
	213	sock_diag_handlers[family] = NULL;
	214	mutex_unlock(&sock_diag_table_mutex);
	215	}
	216	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	217
64be0aed	218	static int __sock_diag_cmd(struct sk_buff skb, struct nlmsghdr nlh)
8ef874bf PE	219	{
8ef874bf PE	220	int err;
7b46866d	221	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	222	const struct sock_diag_handler *hndl;
8ef874bf PE	223
	224	if (nlmsg_len(nlh) < sizeof(*req))
	225	return -EINVAL;
	226
6e601a53 MK	227	if (req->sdiag_family >= AF_MAX)
	228	return -EINVAL;
	229
8e904550 MK	230	if (sock_diag_handlers[req->sdiag_family] == NULL)
	231	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	232	NETLINK_SOCK_DIAG, req->sdiag_family);
	233
	234	mutex_lock(&sock_diag_table_mutex);
	235	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	236	if (hndl == NULL)
8ef874bf PE	237	err = -ENOENT;
64be0aed	238	else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
8ef874bf	239	err = hndl->dump(skb, nlh);
64be0aed LC	240	else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
	241	err = hndl->destroy(skb, nlh);
	242	else
	243	err = -EOPNOTSUPP;
8e904550	244	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	245
	246	return err;
	247	}
	248
	249	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	250	{
	251	int ret;
	252
	253	switch (nlh->nlmsg_type) {
	254	case TCPDIAG_GETSOCK:
	255	case DCCPDIAG_GETSOCK:
	256	if (inet_rcv_compat == NULL)
	257	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	258	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	259
	260	mutex_lock(&sock_diag_table_mutex);
	261	if (inet_rcv_compat != NULL)
	262	ret = inet_rcv_compat(skb, nlh);
	263	else
	264	ret = -EOPNOTSUPP;
	265	mutex_unlock(&sock_diag_table_mutex);
	266
	267	return ret;
	268	case SOCK_DIAG_BY_FAMILY:
64be0aed LC	269	case SOCK_DESTROY:
64be0aed LC	270	return __sock_diag_cmd(skb, nlh);
8ef874bf PE	271	default:
	272	return -EINVAL;
	273	}
	274	}
	275
	276	static DEFINE_MUTEX(sock_diag_mutex);
	277
	278	static void sock_diag_rcv(struct sk_buff *skb)
	279	{
	280	mutex_lock(&sock_diag_mutex);
	281	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	282	mutex_unlock(&sock_diag_mutex);
	283	}
	284
eb4cb008 CG	285	static int sock_diag_bind(struct net *net, int group)
	286	{
	287	switch (group) {
	288	case SKNLGRP_INET_TCP_DESTROY:
	289	case SKNLGRP_INET_UDP_DESTROY:
	290	if (!sock_diag_handlers[AF_INET])
	291	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	292	NETLINK_SOCK_DIAG, AF_INET);
	293	break;
	294	case SKNLGRP_INET6_TCP_DESTROY:
	295	case SKNLGRP_INET6_UDP_DESTROY:
	296	if (!sock_diag_handlers[AF_INET6])
	297	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	298	NETLINK_SOCK_DIAG, AF_INET);
	299	break;
	300	}
	301	return 0;
	302	}
	303
64be0aed LC	304	int sock_diag_destroy(struct sock *sk, int err)
	305	{
	306	if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
	307	return -EPERM;
	308
	309	if (!sk->sk_prot->diag_destroy)
	310	return -EOPNOTSUPP;
	311
	312	return sk->sk_prot->diag_destroy(sk, err);
	313	}
	314	EXPORT_SYMBOL_GPL(sock_diag_destroy);
	315
51d7cccf	316	static int __net_init diag_net_init(struct net *net)
8ef874bf	317	{
a31f2d17	318	struct netlink_kernel_cfg cfg = {
eb4cb008	319	.groups = SKNLGRP_MAX,
a31f2d17	320	.input = sock_diag_rcv,
eb4cb008 CG	321	.bind = sock_diag_bind,
eb4cb008 CG	322	.flags = NL_CFG_F_NONROOT_RECV,
a31f2d17 PNA	323	};
a31f2d17 PNA	324
9f00d977	325	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	326	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	327	}
	328
	329	static void __net_exit diag_net_exit(struct net *net)
	330	{
	331	netlink_kernel_release(net->diag_nlsk);
	332	net->diag_nlsk = NULL;
	333	}
	334
	335	static struct pernet_operations diag_net_ops = {
	336	.init = diag_net_init,
	337	.exit = diag_net_exit,
	338	};
	339
	340	static int __init sock_diag_init(void)
	341	{
eb4cb008 CG	342	broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
eb4cb008 CG	343	BUG_ON(!broadcast_wq);
51d7cccf	344	return register_pernet_subsys(&diag_net_ops);
8ef874bf	345	}
b6191aee	346	device_initcall(sock_diag_init);