[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);

int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
			     struct sk_buff *skb, int attrtype)
{
	struct sock_fprog_kern *fprog;
	struct sk_filter *filter;
	struct nlattr *attr;
	unsigned int flen;
	int err = 0;

	if (!may_report_filterinfo) {
		nla_reserve(skb, attrtype, 0);
		return 0;
	}

	rcu_read_lock();
	filter = rcu_dereference(sk->sk_filter);
	if (!filter)
		goto out;

	fprog = filter->prog->orig_prog;
	flen = bpf_classic_proglen(fprog);

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

	memcpy(nla_data(attr), fprog->filter, flen);
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
a53b72c8	52	int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
e8d9612c ND	53	struct sk_buff *skb, int attrtype)
e8d9612c ND	54	{
a3ea269b	55	struct sock_fprog_kern *fprog;
e8d9612c	56	struct sk_filter *filter;
a3ea269b DB	57	struct nlattr *attr;
a3ea269b DB	58	unsigned int flen;
e8d9612c ND	59	int err = 0;
e8d9612c ND	60
a53b72c8	61	if (!may_report_filterinfo) {
e8d9612c ND	62	nla_reserve(skb, attrtype, 0);
	63	return 0;
	64	}
	65
	66	rcu_read_lock();
e8d9612c	67	filter = rcu_dereference(sk->sk_filter);
a3ea269b DB	68	if (!filter)
a3ea269b DB	69	goto out;
e8d9612c	70
7ae457c1	71	fprog = filter->prog->orig_prog;
009937e7	72	flen = bpf_classic_proglen(fprog);
a3ea269b DB	73
a3ea269b DB	74	attr = nla_reserve(skb, attrtype, flen);
e8d9612c ND	75	if (attr == NULL) {
	76	err = -EMSGSIZE;
	77	goto out;
	78	}
	79
a3ea269b	80	memcpy(nla_data(attr), fprog->filter, flen);
e8d9612c ND	81	out:
	82	rcu_read_unlock();
	83	return err;
	84	}
	85	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	86
8ef874bf PE	87	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	88	{
	89	mutex_lock(&sock_diag_table_mutex);
	90	inet_rcv_compat = fn;
	91	mutex_unlock(&sock_diag_table_mutex);
	92	}
	93	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	94
	95	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	96	{
	97	mutex_lock(&sock_diag_table_mutex);
	98	inet_rcv_compat = NULL;
	99	mutex_unlock(&sock_diag_table_mutex);
	100	}
	101	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	102
8dcf01fc	103	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	104	{
	105	int err = 0;
	106
6f8e4ad0	107	if (hndl->family >= AF_MAX)
8ef874bf PE	108	return -EINVAL;
	109
	110	mutex_lock(&sock_diag_table_mutex);
	111	if (sock_diag_handlers[hndl->family])
	112	err = -EBUSY;
	113	else
	114	sock_diag_handlers[hndl->family] = hndl;
	115	mutex_unlock(&sock_diag_table_mutex);
	116
	117	return err;
	118	}
	119	EXPORT_SYMBOL_GPL(sock_diag_register);
	120
8dcf01fc	121	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	122	{
	123	int family = hnld->family;
	124
6f8e4ad0	125	if (family >= AF_MAX)
8ef874bf PE	126	return;
	127
	128	mutex_lock(&sock_diag_table_mutex);
	129	BUG_ON(sock_diag_handlers[family] != hnld);
	130	sock_diag_handlers[family] = NULL;
	131	mutex_unlock(&sock_diag_table_mutex);
	132	}
	133	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	134
8ef874bf PE	135	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	136	{
	137	int err;
7b46866d	138	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	139	const struct sock_diag_handler *hndl;
8ef874bf PE	140
	141	if (nlmsg_len(nlh) < sizeof(*req))
	142	return -EINVAL;
	143
6e601a53 MK	144	if (req->sdiag_family >= AF_MAX)
	145	return -EINVAL;
	146
8e904550 MK	147	if (sock_diag_handlers[req->sdiag_family] == NULL)
	148	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	149	NETLINK_SOCK_DIAG, req->sdiag_family);
	150
	151	mutex_lock(&sock_diag_table_mutex);
	152	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	153	if (hndl == NULL)
	154	err = -ENOENT;
	155	else
	156	err = hndl->dump(skb, nlh);
8e904550	157	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	158
	159	return err;
	160	}
	161
	162	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	163	{
	164	int ret;
	165
	166	switch (nlh->nlmsg_type) {
	167	case TCPDIAG_GETSOCK:
	168	case DCCPDIAG_GETSOCK:
	169	if (inet_rcv_compat == NULL)
	170	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	171	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	172
	173	mutex_lock(&sock_diag_table_mutex);
	174	if (inet_rcv_compat != NULL)
	175	ret = inet_rcv_compat(skb, nlh);
	176	else
	177	ret = -EOPNOTSUPP;
	178	mutex_unlock(&sock_diag_table_mutex);
	179
	180	return ret;
	181	case SOCK_DIAG_BY_FAMILY:
	182	return __sock_diag_rcv_msg(skb, nlh);
	183	default:
	184	return -EINVAL;
	185	}
	186	}
	187
	188	static DEFINE_MUTEX(sock_diag_mutex);
	189
	190	static void sock_diag_rcv(struct sk_buff *skb)
	191	{
	192	mutex_lock(&sock_diag_mutex);
	193	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	194	mutex_unlock(&sock_diag_mutex);
	195	}
	196
51d7cccf	197	static int __net_init diag_net_init(struct net *net)
8ef874bf	198	{
a31f2d17 PNA	199	struct netlink_kernel_cfg cfg = {
	200	.input = sock_diag_rcv,
	201	};
	202
9f00d977	203	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	204	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	205	}
	206
	207	static void __net_exit diag_net_exit(struct net *net)
	208	{
	209	netlink_kernel_release(net->diag_nlsk);
	210	net->diag_nlsk = NULL;
	211	}
	212
	213	static struct pernet_operations diag_net_ops = {
	214	.init = diag_net_init,
	215	.exit = diag_net_exit,
	216	};
	217
	218	static int __init sock_diag_init(void)
	219	{
	220	return register_pernet_subsys(&diag_net_ops);
8ef874bf PE	221	}
	222
	223	static void __exit sock_diag_exit(void)
	224	{
51d7cccf	225	unregister_pernet_subsys(&diag_net_ops);
8ef874bf PE	226	}
	227
	228	module_init(sock_diag_init);
	229	module_exit(sock_diag_exit);
	230	MODULE_LICENSE("GPL");
	231	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);