[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/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[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);

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);
}

static int __net_init diag_net_init(struct net *net)
{
	struct netlink_kernel_cfg cfg = {
		.input	= sock_diag_rcv,
	};

	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)
{
	return register_pernet_subsys(&diag_net_ops);
}

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

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>
8ef874bf PE	8
	9	#include <linux/inet_diag.h>
	10	#include <linux/sock_diag.h>
	11
8dcf01fc	12	static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
8ef874bf PE	13	static int (inet_rcv_compat)(struct sk_buff skb, struct nlmsghdr *nlh);
	14	static DEFINE_MUTEX(sock_diag_table_mutex);
	15
f65c1b53 PE	16	int sock_diag_check_cookie(void sk, __u32 cookie)
	17	{
	18	if ((cookie[0] != INET_DIAG_NOCOOKIE \|\|
	19	cookie[1] != INET_DIAG_NOCOOKIE) &&
	20	((u32)(unsigned long)sk != cookie[0] \|\|
	21	(u32)((((unsigned long)sk) >> 31) >> 1) != cookie[1]))
	22	return -ESTALE;
	23	else
	24	return 0;
	25	}
	26	EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
	27
	28	void sock_diag_save_cookie(void sk, __u32 cookie)
	29	{
	30	cookie[0] = (u32)(unsigned long)sk;
	31	cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
	32	}
	33	EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
	34
5d2e5f27 PE	35	int sock_diag_put_meminfo(struct sock sk, struct sk_buff skb, int attrtype)
5d2e5f27 PE	36	{
7b46866d	37	u32 mem[SK_MEMINFO_VARS];
5d2e5f27 PE	38
	39	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	40	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	41	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	42	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	43	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	44	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	45	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
d594e987	46	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
5d2e5f27	47
7b46866d	48	return nla_put(skb, attrtype, sizeof(mem), &mem);
5d2e5f27 PE	49	}
	50	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	51
8ef874bf PE	52	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	53	{
	54	mutex_lock(&sock_diag_table_mutex);
	55	inet_rcv_compat = fn;
	56	mutex_unlock(&sock_diag_table_mutex);
	57	}
	58	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	59
	60	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	61	{
	62	mutex_lock(&sock_diag_table_mutex);
	63	inet_rcv_compat = NULL;
	64	mutex_unlock(&sock_diag_table_mutex);
	65	}
	66	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	67
8dcf01fc	68	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	69	{
	70	int err = 0;
	71
6f8e4ad0	72	if (hndl->family >= AF_MAX)
8ef874bf PE	73	return -EINVAL;
	74
	75	mutex_lock(&sock_diag_table_mutex);
	76	if (sock_diag_handlers[hndl->family])
	77	err = -EBUSY;
	78	else
	79	sock_diag_handlers[hndl->family] = hndl;
	80	mutex_unlock(&sock_diag_table_mutex);
	81
	82	return err;
	83	}
	84	EXPORT_SYMBOL_GPL(sock_diag_register);
	85
8dcf01fc	86	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	87	{
	88	int family = hnld->family;
	89
6f8e4ad0	90	if (family >= AF_MAX)
8ef874bf PE	91	return;
	92
	93	mutex_lock(&sock_diag_table_mutex);
	94	BUG_ON(sock_diag_handlers[family] != hnld);
	95	sock_diag_handlers[family] = NULL;
	96	mutex_unlock(&sock_diag_table_mutex);
	97	}
	98	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	99
8dcf01fc	100	static const inline struct sock_diag_handler *sock_diag_lock_handler(int family)
8ef874bf PE	101	{
	102	if (sock_diag_handlers[family] == NULL)
	103	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	104	NETLINK_SOCK_DIAG, family);
8ef874bf PE	105
	106	mutex_lock(&sock_diag_table_mutex);
	107	return sock_diag_handlers[family];
	108	}
	109
8dcf01fc	110	static inline void sock_diag_unlock_handler(const struct sock_diag_handler *h)
8ef874bf PE	111	{
	112	mutex_unlock(&sock_diag_table_mutex);
	113	}
	114
	115	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	116	{
	117	int err;
7b46866d	118	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	119	const struct sock_diag_handler *hndl;
8ef874bf PE	120
	121	if (nlmsg_len(nlh) < sizeof(*req))
	122	return -EINVAL;
	123
	124	hndl = sock_diag_lock_handler(req->sdiag_family);
	125	if (hndl == NULL)
	126	err = -ENOENT;
	127	else
	128	err = hndl->dump(skb, nlh);
	129	sock_diag_unlock_handler(hndl);
	130
	131	return err;
	132	}
	133
	134	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	135	{
	136	int ret;
	137
	138	switch (nlh->nlmsg_type) {
	139	case TCPDIAG_GETSOCK:
	140	case DCCPDIAG_GETSOCK:
	141	if (inet_rcv_compat == NULL)
	142	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	143	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	144
	145	mutex_lock(&sock_diag_table_mutex);
	146	if (inet_rcv_compat != NULL)
	147	ret = inet_rcv_compat(skb, nlh);
	148	else
	149	ret = -EOPNOTSUPP;
	150	mutex_unlock(&sock_diag_table_mutex);
	151
	152	return ret;
	153	case SOCK_DIAG_BY_FAMILY:
	154	return __sock_diag_rcv_msg(skb, nlh);
	155	default:
	156	return -EINVAL;
	157	}
	158	}
	159
	160	static DEFINE_MUTEX(sock_diag_mutex);
	161
	162	static void sock_diag_rcv(struct sk_buff *skb)
	163	{
	164	mutex_lock(&sock_diag_mutex);
	165	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	166	mutex_unlock(&sock_diag_mutex);
	167	}
	168
51d7cccf	169	static int __net_init diag_net_init(struct net *net)
8ef874bf	170	{
a31f2d17 PNA	171	struct netlink_kernel_cfg cfg = {
	172	.input = sock_diag_rcv,
	173	};
	174
9f00d977	175	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	176	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	177	}
	178
	179	static void __net_exit diag_net_exit(struct net *net)
	180	{
	181	netlink_kernel_release(net->diag_nlsk);
	182	net->diag_nlsk = NULL;
	183	}
	184
	185	static struct pernet_operations diag_net_ops = {
	186	.init = diag_net_init,
	187	.exit = diag_net_exit,
	188	};
	189
	190	static int __init sock_diag_init(void)
	191	{
	192	return register_pernet_subsys(&diag_net_ops);
8ef874bf PE	193	}
	194
	195	static void __exit sock_diag_exit(void)
	196	{
51d7cccf	197	unregister_pernet_subsys(&diag_net_ops);
8ef874bf PE	198	}
	199
	200	module_init(sock_diag_init);
	201	module_exit(sock_diag_exit);
	202	MODULE_LICENSE("GPL");
	203	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);