[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);

static u64 sock_gen_cookie(struct sock *sk)
{
	while (1) {
		u64 res = atomic64_read(&sk->sk_cookie);

		if (res)
			return res;
		res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
		atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	}
}

int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
{
	u64 res;

	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
		return 0;

	res = sock_gen_cookie(sk);
	if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
		return -ESTALE;

	return 0;
}
EXPORT_SYMBOL_GPL(sock_diag_check_cookie);

void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
{
	u64 res = sock_gen_cookie(sk);

	cookie[0] = (u32)res;
	cookie[1] = (u32)(res >> 32);
}
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
33cf7c90	16	static u64 sock_gen_cookie(struct sock *sk)
f65c1b53	17	{
33cf7c90 ED	18	while (1) {
	19	u64 res = atomic64_read(&sk->sk_cookie);
	20
	21	if (res)
	22	return res;
	23	res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
	24	atomic64_cmpxchg(&sk->sk_cookie, 0, res);
	25	}
	26	}
	27
	28	int sock_diag_check_cookie(struct sock sk, const __u32 cookie)
	29	{
	30	u64 res;
	31
	32	if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
f65c1b53	33	return 0;
33cf7c90 ED	34
	35	res = sock_gen_cookie(sk);
	36	if ((u32)res != cookie[0] \|\| (u32)(res >> 32) != cookie[1])
	37	return -ESTALE;
	38
	39	return 0;
f65c1b53 PE	40	}
	41	EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
	42
33cf7c90	43	void sock_diag_save_cookie(struct sock sk, __u32 cookie)
f65c1b53	44	{
33cf7c90 ED	45	u64 res = sock_gen_cookie(sk);
	46
	47	cookie[0] = (u32)res;
	48	cookie[1] = (u32)(res >> 32);
f65c1b53 PE	49	}
	50	EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
	51
5d2e5f27 PE	52	int sock_diag_put_meminfo(struct sock sk, struct sk_buff skb, int attrtype)
5d2e5f27 PE	53	{
7b46866d	54	u32 mem[SK_MEMINFO_VARS];
5d2e5f27 PE	55
	56	mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
	57	mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
	58	mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
	59	mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
	60	mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
	61	mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
	62	mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
d594e987	63	mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
5d2e5f27	64
7b46866d	65	return nla_put(skb, attrtype, sizeof(mem), &mem);
5d2e5f27 PE	66	}
	67	EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
	68
a53b72c8	69	int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
e8d9612c ND	70	struct sk_buff *skb, int attrtype)
e8d9612c ND	71	{
a3ea269b	72	struct sock_fprog_kern *fprog;
e8d9612c	73	struct sk_filter *filter;
a3ea269b DB	74	struct nlattr *attr;
a3ea269b DB	75	unsigned int flen;
e8d9612c ND	76	int err = 0;
e8d9612c ND	77
a53b72c8	78	if (!may_report_filterinfo) {
e8d9612c ND	79	nla_reserve(skb, attrtype, 0);
	80	return 0;
	81	}
	82
	83	rcu_read_lock();
e8d9612c	84	filter = rcu_dereference(sk->sk_filter);
a3ea269b DB	85	if (!filter)
a3ea269b DB	86	goto out;
e8d9612c	87
7ae457c1	88	fprog = filter->prog->orig_prog;
009937e7	89	flen = bpf_classic_proglen(fprog);
a3ea269b DB	90
a3ea269b DB	91	attr = nla_reserve(skb, attrtype, flen);
e8d9612c ND	92	if (attr == NULL) {
	93	err = -EMSGSIZE;
	94	goto out;
	95	}
	96
a3ea269b	97	memcpy(nla_data(attr), fprog->filter, flen);
e8d9612c ND	98	out:
	99	rcu_read_unlock();
	100	return err;
	101	}
	102	EXPORT_SYMBOL(sock_diag_put_filterinfo);
	103
8ef874bf PE	104	void sock_diag_register_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	105	{
	106	mutex_lock(&sock_diag_table_mutex);
	107	inet_rcv_compat = fn;
	108	mutex_unlock(&sock_diag_table_mutex);
	109	}
	110	EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
	111
	112	void sock_diag_unregister_inet_compat(int (fn)(struct sk_buff skb, struct nlmsghdr *nlh))
	113	{
	114	mutex_lock(&sock_diag_table_mutex);
	115	inet_rcv_compat = NULL;
	116	mutex_unlock(&sock_diag_table_mutex);
	117	}
	118	EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
	119
8dcf01fc	120	int sock_diag_register(const struct sock_diag_handler *hndl)
8ef874bf PE	121	{
	122	int err = 0;
	123
6f8e4ad0	124	if (hndl->family >= AF_MAX)
8ef874bf PE	125	return -EINVAL;
	126
	127	mutex_lock(&sock_diag_table_mutex);
	128	if (sock_diag_handlers[hndl->family])
	129	err = -EBUSY;
	130	else
	131	sock_diag_handlers[hndl->family] = hndl;
	132	mutex_unlock(&sock_diag_table_mutex);
	133
	134	return err;
	135	}
	136	EXPORT_SYMBOL_GPL(sock_diag_register);
	137
8dcf01fc	138	void sock_diag_unregister(const struct sock_diag_handler *hnld)
8ef874bf PE	139	{
	140	int family = hnld->family;
	141
6f8e4ad0	142	if (family >= AF_MAX)
8ef874bf PE	143	return;
	144
	145	mutex_lock(&sock_diag_table_mutex);
	146	BUG_ON(sock_diag_handlers[family] != hnld);
	147	sock_diag_handlers[family] = NULL;
	148	mutex_unlock(&sock_diag_table_mutex);
	149	}
	150	EXPORT_SYMBOL_GPL(sock_diag_unregister);
	151
8ef874bf PE	152	static int __sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	153	{
	154	int err;
7b46866d	155	struct sock_diag_req *req = nlmsg_data(nlh);
8dcf01fc	156	const struct sock_diag_handler *hndl;
8ef874bf PE	157
	158	if (nlmsg_len(nlh) < sizeof(*req))
	159	return -EINVAL;
	160
6e601a53 MK	161	if (req->sdiag_family >= AF_MAX)
	162	return -EINVAL;
	163
8e904550 MK	164	if (sock_diag_handlers[req->sdiag_family] == NULL)
	165	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
	166	NETLINK_SOCK_DIAG, req->sdiag_family);
	167
	168	mutex_lock(&sock_diag_table_mutex);
	169	hndl = sock_diag_handlers[req->sdiag_family];
8ef874bf PE	170	if (hndl == NULL)
	171	err = -ENOENT;
	172	else
	173	err = hndl->dump(skb, nlh);
8e904550	174	mutex_unlock(&sock_diag_table_mutex);
8ef874bf PE	175
	176	return err;
	177	}
	178
	179	static int sock_diag_rcv_msg(struct sk_buff skb, struct nlmsghdr nlh)
	180	{
	181	int ret;
	182
	183	switch (nlh->nlmsg_type) {
	184	case TCPDIAG_GETSOCK:
	185	case DCCPDIAG_GETSOCK:
	186	if (inet_rcv_compat == NULL)
	187	request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
aec8dc62	188	NETLINK_SOCK_DIAG, AF_INET);
8ef874bf PE	189
	190	mutex_lock(&sock_diag_table_mutex);
	191	if (inet_rcv_compat != NULL)
	192	ret = inet_rcv_compat(skb, nlh);
	193	else
	194	ret = -EOPNOTSUPP;
	195	mutex_unlock(&sock_diag_table_mutex);
	196
	197	return ret;
	198	case SOCK_DIAG_BY_FAMILY:
	199	return __sock_diag_rcv_msg(skb, nlh);
	200	default:
	201	return -EINVAL;
	202	}
	203	}
	204
	205	static DEFINE_MUTEX(sock_diag_mutex);
	206
	207	static void sock_diag_rcv(struct sk_buff *skb)
	208	{
	209	mutex_lock(&sock_diag_mutex);
	210	netlink_rcv_skb(skb, &sock_diag_rcv_msg);
	211	mutex_unlock(&sock_diag_mutex);
	212	}
	213
51d7cccf	214	static int __net_init diag_net_init(struct net *net)
8ef874bf	215	{
a31f2d17 PNA	216	struct netlink_kernel_cfg cfg = {
	217	.input = sock_diag_rcv,
	218	};
	219
9f00d977	220	net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
51d7cccf AV	221	return net->diag_nlsk == NULL ? -ENOMEM : 0;
	222	}
	223
	224	static void __net_exit diag_net_exit(struct net *net)
	225	{
	226	netlink_kernel_release(net->diag_nlsk);
	227	net->diag_nlsk = NULL;
	228	}
	229
	230	static struct pernet_operations diag_net_ops = {
	231	.init = diag_net_init,
	232	.exit = diag_net_exit,
	233	};
	234
	235	static int __init sock_diag_init(void)
	236	{
	237	return register_pernet_subsys(&diag_net_ops);
8ef874bf PE	238	}
	239
	240	static void __exit sock_diag_exit(void)
	241	{
51d7cccf	242	unregister_pernet_subsys(&diag_net_ops);
8ef874bf PE	243	}
	244
	245	module_init(sock_diag_init);
	246	module_exit(sock_diag_exit);
	247	MODULE_LICENSE("GPL");
	248	MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);