[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 <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);

int sock_diag_put_filterinfo(struct user_namespace *user_ns, struct sock *sk,
			     struct sk_buff *skb, int attrtype)
{
	struct nlattr *attr;
	struct sk_filter *filter;
	unsigned int len;
	int err = 0;

	if (!ns_capable(user_ns, CAP_NET_ADMIN)) {
		nla_reserve(skb, attrtype, 0);
		return 0;
	}

	rcu_read_lock();

	filter = rcu_dereference(sk->sk_filter);
	len = filter ? filter->len * sizeof(struct sock_filter) : 0;

	attr = nla_reserve(skb, attrtype, len);
	if (attr == NULL) {
		err = -EMSGSIZE;
		goto out;
	}

	if (filter) {
		struct sock_filter *fb = (struct sock_filter *)nla_data(attr);
		int i;

		for (i = 0; i < filter->len; i++, fb++)
			sk_decode_filter(&filter->insns[i], fb);
	}

out:
	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(sock_diag_put_filterinfo);

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
e8d9612c ND	52	int sock_diag_put_filterinfo(struct user_namespace user_ns, struct sock sk,
	53	struct sk_buff *skb, int attrtype)
	54	{
	55	struct nlattr *attr;
	56	struct sk_filter *filter;
	57	unsigned int len;
	58	int err = 0;
	59
	60	if (!ns_capable(user_ns, CAP_NET_ADMIN)) {
	61	nla_reserve(skb, attrtype, 0);
	62	return 0;
	63	}
	64
	65	rcu_read_lock();
	66
	67	filter = rcu_dereference(sk->sk_filter);
	68	len = filter ? filter->len * sizeof(struct sock_filter) : 0;
	69
	70	attr = nla_reserve(skb, attrtype, len);
	71	if (attr == NULL) {
	72	err = -EMSGSIZE;
	73	goto out;
	74	}
	75
ed13998c ND	76	if (filter) {
	77	struct sock_filter fb = (struct sock_filter )nla_data(attr);
	78	int i;
	79
	80	for (i = 0; i < filter->len; i++, fb++)
	81	sk_decode_filter(&filter->insns[i], fb);
	82	}
e8d9612c ND	83
	84	out:
	85	rcu_read_unlock();
	86	return err;
	87	}
	88	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	89
8ef874bf PE	90	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	91	{
	92	mutex_lock(&sock_diag_table_mutex);
	93	inet_rcv_compat = fn;
	94	mutex_unlock(&sock_diag_table_mutex);
	95	}
	96	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	97
	98	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	99	{
	100	mutex_lock(&sock_diag_table_mutex);
	101	inet_rcv_compat = NULL;
	102	mutex_unlock(&sock_diag_table_mutex);
	103	}
	104	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	105
8dcf01fc	106	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	107	{
	108	int err = 0;
	109
6f8e4ad0	110	if (hndl->family >= AF_MAX)
8ef874bf PE	111	return -EINVAL;
	112
	113	mutex_lock(&sock_diag_table_mutex);
	114	if (sock_diag_handlers[hndl->family])
	115	err = -EBUSY;
	116	else
	117	sock_diag_handlers[hndl->family] = hndl;
	118	mutex_unlock(&sock_diag_table_mutex);
	119
	120	return err;
	121	}
	122	EXPORT_SYMBOL_GPL(sock_diag_register);
	123
8dcf01fc	124	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	125	{
	126	int family = hnld->family;
	127
6f8e4ad0	128	if (family >= AF_MAX)
8ef874bf PE	129	return;
	130
	131	mutex_lock(&sock_diag_table_mutex);
	132	BUG_ON(sock_diag_handlers[family] != hnld);
	133	sock_diag_handlers[family] = NULL;
	134	mutex_unlock(&sock_diag_table_mutex);
	135	}
	136	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	137
8ef874bf PE	138	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	139	{
	140	int err;
7b46866d	141	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	142	const struct sock_diag_handler *hndl;
8ef874bf PE	143
	144	if (nlmsg_len(nlh) < sizeof(*req))
	145	return -EINVAL;
	146
6e601a53 MK	147	if (req->sdiag_family >= AF_MAX)
	148	return -EINVAL;
	149
8e904550 MK	150	if (sock_diag_handlers[req->sdiag_family] == NULL)
	151	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	152	NETLINK_SOCK_DIAG, req->sdiag_family);
	153
	154	mutex_lock(&sock_diag_table_mutex);
	155	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	156	if (hndl == NULL)
	157	err = -ENOENT;
	158	else
	159	err = hndl->dump(skb, nlh);
8e904550	160	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	161
	162	return err;
	163	}
	164
	165	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	166	{
	167	int ret;
	168
	169	switch (nlh->nlmsg_type) {
	170	case TCPDIAG_GETSOCK:
	171	case DCCPDIAG_GETSOCK:
	172	if (inet_rcv_compat == NULL)
	173	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	174	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	175
	176	mutex_lock(&sock_diag_table_mutex);
	177	if (inet_rcv_compat != NULL)
	178	ret = inet_rcv_compat(skb, nlh);
	179	else
	180	ret = -EOPNOTSUPP;
	181	mutex_unlock(&sock_diag_table_mutex);
	182
	183	return ret;
	184	case SOCK_DIAG_BY_FAMILY:
	185	return __sock_diag_rcv_msg(skb, nlh);
	186	default:
	187	return -EINVAL;
	188	}
	189	}
	190
	191	static DEFINE_MUTEX(sock_diag_mutex);
	192
	193	static void sock_diag_rcv(struct sk_buff *skb)
	194	{
	195	mutex_lock(&sock_diag_mutex);
	196	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	197	mutex_unlock(&sock_diag_mutex);
	198	}
	199
51d7cccf	200	static int __net_init diag_net_init(struct net *net)
8ef874bf	201	{
a31f2d17 PNA	202	struct netlink_kernel_cfg cfg = {
	203	.input = sock_diag_rcv,
	204	};
	205
9f00d977	206	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	207	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	208	}
	209
	210	static void __net_exit diag_net_exit(struct net *net)
	211	{
	212	netlink_kernel_release(net->diag_nlsk);
	213	net->diag_nlsk = NULL;
	214	}
	215
	216	static struct pernet_operations diag_net_ops = {
	217	.init = diag_net_init,
	218	.exit = diag_net_exit,
	219	};
	220
	221	static int __init sock_diag_init(void)
	222	{
	223	return register_pernet_subsys(&diag_net_ops);
8ef874bf PE	224	}
	225
	226	static void __exit sock_diag_exit(void)
	227	{
51d7cccf	228	unregister_pernet_subsys(&diag_net_ops);
8ef874bf PE	229	}
	230
	231	module_init(sock_diag_init);
	232	module_exit(sock_diag_exit);
	233	MODULE_LICENSE("GPL");
	234	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);