[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/rtnetlink.h>
#include <net/sock.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);

int sock_diag_check_cookie(void *sk, __u32 *cookie)
{
	if ((cookie[0] != INET_DIAG_NOCOOKIE ||
	     cookie[1] != INET_DIAG_NOCOOKIE) &&
	    ((u32)(unsigned long)sk != cookie[0] ||
	     (u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1]))
		return -ESTALE;
	else
		return 0;
}
EXPORT_SYMBOL_GPL(sock_diag_check_cookie);

void sock_diag_save_cookie(void *sk, __u32 *cookie)
{
	cookie[0] = (u32)(unsigned long)sk;
	cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
}
EXPORT_SYMBOL_GPL(sock_diag_save_cookie);

int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
{
	__u32 *mem;

	mem = RTA_DATA(__RTA_PUT(skb, attrtype, SK_MEMINFO_VARS * sizeof(__u32)));

	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 0;

rtattr_failure:
	return -EMSGSIZE;
}
EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);

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 const 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, family);

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

static inline void sock_diag_unlock_handler(const 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);
	const 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, 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);
}

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>
5d2e5f27 PE	7	#include <linux/rtnetlink.h>
5d2e5f27 PE	8	#include <net/sock.h>
8ef874bf PE	9
	10	#include <linux/inet_diag.h>
	11	#include <linux/sock_diag.h>
	12
8dcf01fc	13	static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
8ef874bf PE	14	static int (inet_rcv_compat)(struct sk_buff skb, struct nlmsghdr *nlh);
	15	static DEFINE_MUTEX(sock_diag_table_mutex);
	16
f65c1b53 PE	17	int sock_diag_check_cookie(void sk, __u32 cookie)
	18	{
	19	if ((cookie[0] != INET_DIAG_NOCOOKIE \|\|
	20	cookie[1] != INET_DIAG_NOCOOKIE) &&
	21	((u32)(unsigned long)sk != cookie[0] \|\|
	22	(u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1]))
	23	return -ESTALE;
	24	else
	25	return 0;
	26	}
	27	EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
	28
	29	void sock_diag_save_cookie(void sk, __u32 cookie)
	30	{
	31	cookie[0] = (u32)(unsigned long)sk;
	32	cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
	33	}
	34	EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
	35
5d2e5f27 PE	36	int sock_diag_put_meminfo(struct sock sk, struct sk_buff skb, int attrtype)
	37	{
	38	__u32 *mem;
	39
	40	mem = RTA_DATA(__RTA_PUT(skb, attrtype, SK_MEMINFO_VARS * sizeof(__u32)));
	41
	42	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	43	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	44	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	45	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	46	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	47	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	48	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
d594e987	49	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
5d2e5f27 PE	50
	51	return 0;
	52
	53	rtattr_failure:
	54	return -EMSGSIZE;
	55	}
	56	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	57
8ef874bf PE	58	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	59	{
	60	mutex_lock(&sock_diag_table_mutex);
	61	inet_rcv_compat = fn;
	62	mutex_unlock(&sock_diag_table_mutex);
	63	}
	64	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	65
	66	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	67	{
	68	mutex_lock(&sock_diag_table_mutex);
	69	inet_rcv_compat = NULL;
	70	mutex_unlock(&sock_diag_table_mutex);
	71	}
	72	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	73
8dcf01fc	74	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	75	{
	76	int err = 0;
	77
6f8e4ad0	78	if (hndl->family >= AF_MAX)
8ef874bf PE	79	return -EINVAL;
	80
	81	mutex_lock(&sock_diag_table_mutex);
	82	if (sock_diag_handlers[hndl->family])
	83	err = -EBUSY;
	84	else
	85	sock_diag_handlers[hndl->family] = hndl;
	86	mutex_unlock(&sock_diag_table_mutex);
	87
	88	return err;
	89	}
	90	EXPORT_SYMBOL_GPL(sock_diag_register);
	91
8dcf01fc	92	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	93	{
	94	int family = hnld->family;
	95
6f8e4ad0	96	if (family >= AF_MAX)
8ef874bf PE	97	return;
	98
	99	mutex_lock(&sock_diag_table_mutex);
	100	BUG_ON(sock_diag_handlers[family] != hnld);
	101	sock_diag_handlers[family] = NULL;
	102	mutex_unlock(&sock_diag_table_mutex);
	103	}
	104	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	105
8dcf01fc	106	static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
8ef874bf PE	107	{
	108	if (sock_diag_handlers[family] == NULL)
	109	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	110	NETLINK_SOCK_DIAG, family);
8ef874bf PE	111
	112	mutex_lock(&sock_diag_table_mutex);
	113	return sock_diag_handlers[family];
	114	}
	115
8dcf01fc	116	static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
8ef874bf PE	117	{
	118	mutex_unlock(&sock_diag_table_mutex);
	119	}
	120
	121	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	122	{
	123	int err;
	124	struct sock_diag_req *req = NLMSG_DATA(nlh);
8dcf01fc	125	const struct sock_diag_handler *hndl;
8ef874bf PE	126
	127	if (nlmsg_len(nlh) < sizeof(*req))
	128	return -EINVAL;
	129
	130	hndl = sock_diag_lock_handler(req->sdiag_family);
	131	if (hndl == NULL)
	132	err = -ENOENT;
	133	else
	134	err = hndl->dump(skb, nlh);
	135	sock_diag_unlock_handler(hndl);
	136
	137	return err;
	138	}
	139
	140	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	141	{
	142	int ret;
	143
	144	switch (nlh->nlmsg_type) {
	145	case TCPDIAG_GETSOCK:
	146	case DCCPDIAG_GETSOCK:
	147	if (inet_rcv_compat == NULL)
	148	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	149	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	150
	151	mutex_lock(&sock_diag_table_mutex);
	152	if (inet_rcv_compat != NULL)
	153	ret = inet_rcv_compat(skb, nlh);
	154	else
	155	ret = -EOPNOTSUPP;
	156	mutex_unlock(&sock_diag_table_mutex);
	157
	158	return ret;
	159	case SOCK_DIAG_BY_FAMILY:
	160	return __sock_diag_rcv_msg(skb, nlh);
	161	default:
	162	return -EINVAL;
	163	}
	164	}
	165
	166	static DEFINE_MUTEX(sock_diag_mutex);
	167
	168	static void sock_diag_rcv(struct sk_buff *skb)
	169	{
	170	mutex_lock(&sock_diag_mutex);
	171	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	172	mutex_unlock(&sock_diag_mutex);
	173	}
	174
	175	struct sock *sock_diag_nlsk;
	176	EXPORT_SYMBOL_GPL(sock_diag_nlsk);
	177
	178	static int __init sock_diag_init(void)
	179	{
	180	sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
	181	sock_diag_rcv, NULL, THIS_MODULE);
	182	return sock_diag_nlsk == NULL ? -ENOMEM : 0;
	183	}
	184
	185	static void __exit sock_diag_exit(void)
	186	{
	187	netlink_kernel_release(sock_diag_nlsk);
	188	}
	189
	190	module_init(sock_diag_init);
	191	module_exit(sock_diag_exit);
	192	MODULE_LICENSE("GPL");
	193	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);