[mirror_ubuntu-zesty-kernel.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 <linux/inet_diag.h>
#include <linux/sock_diag.h>

static 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);

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(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(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 inline struct sock_diag_handler *sock_diag_lock_handler(int family)
{
	if (sock_diag_handlers[family] == NULL)
		request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
				NETLINK_SOCK_DIAG, IPPROTO_IP);

	mutex_lock(&sock_diag_table_mutex);
	return sock_diag_handlers[family];
}

static inline void sock_diag_unlock_handler(struct sock_diag_handler *h)
{
	mutex_unlock(&sock_diag_table_mutex);
}

static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	int err;
	struct sock_diag_req *req = NLMSG_DATA(nlh);
	struct sock_diag_handler *hndl;

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

	hndl = sock_diag_lock_handler(req->sdiag_family);
	if (hndl == NULL)
		err = -ENOENT;
	else
		err = hndl->dump(skb, nlh);
	sock_diag_unlock_handler(hndl);

	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, IPPROTO_IP);

		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);
}

struct sock *sock_diag_nlsk;
EXPORT_SYMBOL_GPL(sock_diag_nlsk);

static int __init sock_diag_init(void)
{
	sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
					sock_diag_rcv, NULL, THIS_MODULE);
	return sock_diag_nlsk == NULL ? -ENOMEM : 0;
}

static void __exit sock_diag_exit(void)
{
	netlink_kernel_release(sock_diag_nlsk);
}

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>
	7
	8	#include <linux/inet_diag.h>
	9	#include <linux/sock_diag.h>
	10
	11	static struct sock_diag_handler *sock_diag_handlers[AF_MAX];
	12	static int (inet_rcv_compat)(struct sk_buff skb, struct nlmsghdr *nlh);
	13	static DEFINE_MUTEX(sock_diag_table_mutex);
	14
	15	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	16	{
	17	mutex_lock(&sock_diag_table_mutex);
	18	inet_rcv_compat = fn;
	19	mutex_unlock(&sock_diag_table_mutex);
	20	}
	21	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	22
	23	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	24	{
	25	mutex_lock(&sock_diag_table_mutex);
	26	inet_rcv_compat = NULL;
	27	mutex_unlock(&sock_diag_table_mutex);
	28	}
	29	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	30
	31	int sock_diag_register(struct sock_diag_handler *hndl)
	32	{
	33	int err = 0;
	34
6f8e4ad0	35	if (hndl->family >= AF_MAX)
8ef874bf PE	36	return -EINVAL;
	37
	38	mutex_lock(&sock_diag_table_mutex);
	39	if (sock_diag_handlers[hndl->family])
	40	err = -EBUSY;
	41	else
	42	sock_diag_handlers[hndl->family] = hndl;
	43	mutex_unlock(&sock_diag_table_mutex);
	44
	45	return err;
	46	}
	47	EXPORT_SYMBOL_GPL(sock_diag_register);
	48
	49	void sock_diag_unregister(struct sock_diag_handler *hnld)
	50	{
	51	int family = hnld->family;
	52
6f8e4ad0	53	if (family >= AF_MAX)
8ef874bf PE	54	return;
	55
	56	mutex_lock(&sock_diag_table_mutex);
	57	BUG_ON(sock_diag_handlers[family] != hnld);
	58	sock_diag_handlers[family] = NULL;
	59	mutex_unlock(&sock_diag_table_mutex);
	60	}
	61	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	62
	63	static inline struct sock_diag_handler *sock_diag_lock_handler(int family)
	64	{
	65	if (sock_diag_handlers[family] == NULL)
	66	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	67	NETLINK_SOCK_DIAG, IPPROTO_IP);
	68
	69	mutex_lock(&sock_diag_table_mutex);
	70	return sock_diag_handlers[family];
	71	}
	72
	73	static inline void sock_diag_unlock_handler(struct sock_diag_handler *h)
	74	{
	75	mutex_unlock(&sock_diag_table_mutex);
	76	}
	77
	78	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	79	{
	80	int err;
	81	struct sock_diag_req *req = NLMSG_DATA(nlh);
	82	struct sock_diag_handler *hndl;
	83
	84	if (nlmsg_len(nlh) < sizeof(*req))
	85	return -EINVAL;
	86
	87	hndl = sock_diag_lock_handler(req->sdiag_family);
	88	if (hndl == NULL)
	89	err = -ENOENT;
	90	else
	91	err = hndl->dump(skb, nlh);
	92	sock_diag_unlock_handler(hndl);
	93
	94	return err;
	95	}
	96
	97	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	98	{
	99	int ret;
	100
	101	switch (nlh->nlmsg_type) {
	102	case TCPDIAG_GETSOCK:
	103	case DCCPDIAG_GETSOCK:
	104	if (inet_rcv_compat == NULL)
	105	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	106	NETLINK_SOCK_DIAG, IPPROTO_IP);
	107
	108	mutex_lock(&sock_diag_table_mutex);
	109	if (inet_rcv_compat != NULL)
	110	ret = inet_rcv_compat(skb, nlh);
	111	else
	112	ret = -EOPNOTSUPP;
	113	mutex_unlock(&sock_diag_table_mutex);
	114
	115	return ret;
	116	case SOCK_DIAG_BY_FAMILY:
	117	return __sock_diag_rcv_msg(skb, nlh);
118	default:
119	return -EINVAL;
120	}
121	}
122
123	static DEFINE_MUTEX(sock_diag_mutex);
124
125	static void sock_diag_rcv(struct sk_buff *skb)
126	{
127	mutex_lock(&sock_diag_mutex);
128	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
129	mutex_unlock(&sock_diag_mutex);
130	}
131
132	struct sock *sock_diag_nlsk;
133	EXPORT_SYMBOL_GPL(sock_diag_nlsk);
134
135	static int __init sock_diag_init(void)
136	{
137	sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
138	sock_diag_rcv, NULL, THIS_MODULE);
139	return sock_diag_nlsk == NULL ? -ENOMEM : 0;
140	}
141
142	static void __exit sock_diag_exit(void)
143	{
144	netlink_kernel_release(sock_diag_nlsk);
145	}
146
147	module_init(sock_diag_init);
148	module_exit(sock_diag_exit);
149	MODULE_LICENSE("GPL");
150	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);