[deliverable/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 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;

	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
		err = hndl->dump(skb, nlh);
	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:
		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
8ef874bf PE	100	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	101	{
	102	int err;
7b46866d	103	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	104	const struct sock_diag_handler *hndl;
8ef874bf PE	105
	106	if (nlmsg_len(nlh) < sizeof(*req))
	107	return -EINVAL;
	108
6e601a53 MK	109	if (req->sdiag_family >= AF_MAX)
	110	return -EINVAL;
	111
8e904550 MK	112	if (sock_diag_handlers[req->sdiag_family] == NULL)
	113	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	114	NETLINK_SOCK_DIAG, req->sdiag_family);
	115
	116	mutex_lock(&sock_diag_table_mutex);
	117	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	118	if (hndl == NULL)
	119	err = -ENOENT;
	120	else
	121	err = hndl->dump(skb, nlh);
8e904550	122	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	123
	124	return err;
	125	}
	126
	127	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	128	{
	129	int ret;
	130
	131	switch (nlh->nlmsg_type) {
	132	case TCPDIAG_GETSOCK:
	133	case DCCPDIAG_GETSOCK:
	134	if (inet_rcv_compat == NULL)
	135	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	136	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	137
	138	mutex_lock(&sock_diag_table_mutex);
	139	if (inet_rcv_compat != NULL)
	140	ret = inet_rcv_compat(skb, nlh);
	141	else
	142	ret = -EOPNOTSUPP;
	143	mutex_unlock(&sock_diag_table_mutex);
	144
	145	return ret;
	146	case SOCK_DIAG_BY_FAMILY:
	147	return __sock_diag_rcv_msg(skb, nlh);
	148	default:
	149	return -EINVAL;
	150	}
	151	}
	152
	153	static DEFINE_MUTEX(sock_diag_mutex);
	154
	155	static void sock_diag_rcv(struct sk_buff *skb)
	156	{
	157	mutex_lock(&sock_diag_mutex);
	158	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	159	mutex_unlock(&sock_diag_mutex);
	160	}
	161
51d7cccf	162	static int __net_init diag_net_init(struct net *net)
8ef874bf	163	{
a31f2d17 PNA	164	struct netlink_kernel_cfg cfg = {
	165	.input = sock_diag_rcv,
	166	};
	167
9f00d977	168	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	169	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	170	}
	171
	172	static void __net_exit diag_net_exit(struct net *net)
	173	{
	174	netlink_kernel_release(net->diag_nlsk);
	175	net->diag_nlsk = NULL;
	176	}
	177
	178	static struct pernet_operations diag_net_ops = {
	179	.init = diag_net_init,
	180	.exit = diag_net_exit,
	181	};
	182
	183	static int __init sock_diag_init(void)
	184	{
	185	return register_pernet_subsys(&diag_net_ops);
8ef874bf PE	186	}
	187
	188	static void __exit sock_diag_exit(void)
	189	{
51d7cccf	190	unregister_pernet_subsys(&diag_net_ops);
8ef874bf PE	191	}
	192
	193	module_init(sock_diag_init);
	194	module_exit(sock_diag_exit);
	195	MODULE_LICENSE("GPL");
	196	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);