[linux-2.6-block.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);

	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);
	49
	50	return 0;
	51
	52	rtattr_failure:
	53	return -EMSGSIZE;
	54	}
	55	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	56
8ef874bf PE	57	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	58	{
	59	mutex_lock(&sock_diag_table_mutex);
	60	inet_rcv_compat = fn;
	61	mutex_unlock(&sock_diag_table_mutex);
	62	}
	63	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	64
	65	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	66	{
	67	mutex_lock(&sock_diag_table_mutex);
	68	inet_rcv_compat = NULL;
	69	mutex_unlock(&sock_diag_table_mutex);
	70	}
	71	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	72
8dcf01fc	73	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	74	{
	75	int err = 0;
	76
6f8e4ad0	77	if (hndl->family >= AF_MAX)
8ef874bf PE	78	return -EINVAL;
	79
	80	mutex_lock(&sock_diag_table_mutex);
	81	if (sock_diag_handlers[hndl->family])
	82	err = -EBUSY;
	83	else
	84	sock_diag_handlers[hndl->family] = hndl;
	85	mutex_unlock(&sock_diag_table_mutex);
	86
	87	return err;
	88	}
	89	EXPORT_SYMBOL_GPL(sock_diag_register);
	90
8dcf01fc	91	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	92	{
	93	int family = hnld->family;
	94
6f8e4ad0	95	if (family >= AF_MAX)
8ef874bf PE	96	return;
	97
	98	mutex_lock(&sock_diag_table_mutex);
	99	BUG_ON(sock_diag_handlers[family] != hnld);
	100	sock_diag_handlers[family] = NULL;
	101	mutex_unlock(&sock_diag_table_mutex);
	102	}
	103	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	104
8dcf01fc	105	static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
8ef874bf PE	106	{
	107	if (sock_diag_handlers[family] == NULL)
	108	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	109	NETLINK_SOCK_DIAG, family);
8ef874bf PE	110
	111	mutex_lock(&sock_diag_table_mutex);
	112	return sock_diag_handlers[family];
	113	}
	114
8dcf01fc	115	static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
8ef874bf PE	116	{
	117	mutex_unlock(&sock_diag_table_mutex);
	118	}
	119
	120	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	121	{
	122	int err;
	123	struct sock_diag_req *req = NLMSG_DATA(nlh);
8dcf01fc	124	const struct sock_diag_handler *hndl;
8ef874bf PE	125
	126	if (nlmsg_len(nlh) < sizeof(*req))
	127	return -EINVAL;
	128
	129	hndl = sock_diag_lock_handler(req->sdiag_family);
	130	if (hndl == NULL)
	131	err = -ENOENT;
	132	else
	133	err = hndl->dump(skb, nlh);
	134	sock_diag_unlock_handler(hndl);
	135
	136	return err;
	137	}
	138
	139	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	140	{
	141	int ret;
	142
	143	switch (nlh->nlmsg_type) {
	144	case TCPDIAG_GETSOCK:
	145	case DCCPDIAG_GETSOCK:
	146	if (inet_rcv_compat == NULL)
	147	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	148	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	149
	150	mutex_lock(&sock_diag_table_mutex);
	151	if (inet_rcv_compat != NULL)
	152	ret = inet_rcv_compat(skb, nlh);
	153	else
	154	ret = -EOPNOTSUPP;
	155	mutex_unlock(&sock_diag_table_mutex);
	156
	157	return ret;
	158	case SOCK_DIAG_BY_FAMILY:
	159	return __sock_diag_rcv_msg(skb, nlh);
	160	default:
	161	return -EINVAL;
	162	}
	163	}
	164
	165	static DEFINE_MUTEX(sock_diag_mutex);
	166
	167	static void sock_diag_rcv(struct sk_buff *skb)
	168	{
	169	mutex_lock(&sock_diag_mutex);
	170	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	171	mutex_unlock(&sock_diag_mutex);
	172	}
	173
	174	struct sock *sock_diag_nlsk;
	175	EXPORT_SYMBOL_GPL(sock_diag_nlsk);
	176
	177	static int __init sock_diag_init(void)
	178	{
	179	sock_diag_nlsk = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
	180	sock_diag_rcv, NULL, THIS_MODULE);
	181	return sock_diag_nlsk == NULL ? -ENOMEM : 0;
	182	}
	183
	184	static void __exit sock_diag_exit(void)
	185	{
	186	netlink_kernel_release(sock_diag_nlsk);
	187	}
	188
	189	module_init(sock_diag_init);
	190	module_exit(sock_diag_exit);
	191	MODULE_LICENSE("GPL");
	192	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);