[deliverable/linux.git] / net / unix / diag.c

#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/sock_diag.h>
#include <linux/unix_diag.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <net/netlink.h>
#include <net/af_unix.h>
#include <net/tcp_states.h>

static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
{
	struct unix_address *addr = unix_sk(sk)->addr;

	if (!addr)
		return 0;

	return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
		       addr->name->sun_path);
}

static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
{
	struct dentry *dentry = unix_sk(sk)->path.dentry;

	if (dentry) {
		struct unix_diag_vfs uv = {
			.udiag_vfs_ino = dentry->d_inode->i_ino,
			.udiag_vfs_dev = dentry->d_sb->s_dev,
		};

		return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
	}

	return 0;
}

static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
{
	struct sock *peer;
	int ino;

	peer = unix_peer_get(sk);
	if (peer) {
		unix_state_lock(peer);
		ino = sock_i_ino(peer);
		unix_state_unlock(peer);
		sock_put(peer);

		return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
	}

	return 0;
}

static int sk_diag_dump_icons(struct sock *sk, struct sk_buff *nlskb)
{
	struct sk_buff *skb;
	struct nlattr *attr;
	u32 *buf;
	int i;

	if (sk->sk_state == TCP_LISTEN) {
		spin_lock(&sk->sk_receive_queue.lock);

		attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
				   sk->sk_receive_queue.qlen * sizeof(u32));
		if (!attr)
			goto errout;

		buf = nla_data(attr);
		i = 0;
		skb_queue_walk(&sk->sk_receive_queue, skb) {
			struct sock *req, *peer;

			req = skb->sk;
			/*
			 * The state lock is outer for the same sk's
			 * queue lock. With the other's queue locked it's
			 * OK to lock the state.
			 */
			unix_state_lock_nested(req);
			peer = unix_sk(req)->peer;
			buf[i++] = (peer ? sock_i_ino(peer) : 0);
			unix_state_unlock(req);
		}
		spin_unlock(&sk->sk_receive_queue.lock);
	}

	return 0;

errout:
	spin_unlock(&sk->sk_receive_queue.lock);
	return -EMSGSIZE;
}

static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
{
	struct unix_diag_rqlen rql;

	if (sk->sk_state == TCP_LISTEN) {
		rql.udiag_rqueue = sk->sk_receive_queue.qlen;
		rql.udiag_wqueue = sk->sk_max_ack_backlog;
	} else {
		rql.udiag_rqueue = (u32) unix_inq_len(sk);
		rql.udiag_wqueue = (u32) unix_outq_len(sk);
	}

	return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
}

static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
		u32 pid, u32 seq, u32 flags, int sk_ino)
{
	struct nlmsghdr *nlh;
	struct unix_diag_msg *rep;

	nlh = nlmsg_put(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
			flags);
	if (!nlh)
		return -EMSGSIZE;

	rep = nlmsg_data(nlh);
	rep->udiag_family = AF_UNIX;
	rep->udiag_type = sk->sk_type;
	rep->udiag_state = sk->sk_state;
	rep->udiag_ino = sk_ino;
	sock_diag_save_cookie(sk, rep->udiag_cookie);

	if ((req->udiag_show & UDIAG_SHOW_NAME) &&
	    sk_diag_dump_name(sk, skb))
		goto out_nlmsg_trim;

	if ((req->udiag_show & UDIAG_SHOW_VFS) &&
	    sk_diag_dump_vfs(sk, skb))
		goto out_nlmsg_trim;

	if ((req->udiag_show & UDIAG_SHOW_PEER) &&
	    sk_diag_dump_peer(sk, skb))
		goto out_nlmsg_trim;

	if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
	    sk_diag_dump_icons(sk, skb))
		goto out_nlmsg_trim;

	if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
	    sk_diag_show_rqlen(sk, skb))
		goto out_nlmsg_trim;

	if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
	    sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
		goto out_nlmsg_trim;

	return nlmsg_end(skb, nlh);

out_nlmsg_trim:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
		u32 pid, u32 seq, u32 flags)
{
	int sk_ino;

	unix_state_lock(sk);
	sk_ino = sock_i_ino(sk);
	unix_state_unlock(sk);

	if (!sk_ino)
		return 0;

	return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino);
}

static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct unix_diag_req *req;
	int num, s_num, slot, s_slot;

	req = nlmsg_data(cb->nlh);

	s_slot = cb->args[0];
	num = s_num = cb->args[1];

	spin_lock(&unix_table_lock);
	for (slot = s_slot;
	     slot < ARRAY_SIZE(unix_socket_table);
	     s_num = 0, slot++) {
		struct sock *sk;
		struct hlist_node *node;

		num = 0;
		sk_for_each(sk, node, &unix_socket_table[slot]) {
			if (num < s_num)
				goto next;
			if (!(req->udiag_states & (1 << sk->sk_state)))
				goto next;
			if (sk_diag_dump(sk, skb, req,
					 NETLINK_CB(cb->skb).pid,
					 cb->nlh->nlmsg_seq,
					 NLM_F_MULTI) < 0)
				goto done;
next:
			num++;
		}
	}
done:
	spin_unlock(&unix_table_lock);
	cb->args[0] = slot;
	cb->args[1] = num;

	return skb->len;
}

static struct sock *unix_lookup_by_ino(int ino)
{
	int i;
	struct sock *sk;

	spin_lock(&unix_table_lock);
	for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
		struct hlist_node *node;

		sk_for_each(sk, node, &unix_socket_table[i])
			if (ino == sock_i_ino(sk)) {
				sock_hold(sk);
				spin_unlock(&unix_table_lock);

				return sk;
			}
	}

	spin_unlock(&unix_table_lock);
	return NULL;
}

static int unix_diag_get_exact(struct sk_buff *in_skb,
			       const struct nlmsghdr *nlh,
			       struct unix_diag_req *req)
{
	int err = -EINVAL;
	struct sock *sk;
	struct sk_buff *rep;
	unsigned int extra_len;

	if (req->udiag_ino == 0)
		goto out_nosk;

	sk = unix_lookup_by_ino(req->udiag_ino);
	err = -ENOENT;
	if (sk == NULL)
		goto out_nosk;

	err = sock_diag_check_cookie(sk, req->udiag_cookie);
	if (err)
		goto out;

	extra_len = 256;
again:
	err = -ENOMEM;
	rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
	if (!rep)
		goto out;

	err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid,
			   nlh->nlmsg_seq, 0, req->udiag_ino);
	if (err < 0) {
		nlmsg_free(rep);
		extra_len += 256;
		if (extra_len >= PAGE_SIZE)
			goto out;

		goto again;
	}
	err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
			      MSG_DONTWAIT);
	if (err > 0)
		err = 0;
out:
	if (sk)
		sock_put(sk);
out_nosk:
	return err;
}

static int unix_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
{
	int hdrlen = sizeof(struct unix_diag_req);

	if (nlmsg_len(h) < hdrlen)
		return -EINVAL;

	if (h->nlmsg_flags & NLM_F_DUMP) {
		struct netlink_dump_control c = {
			.dump = unix_diag_dump,
		};
		return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
	} else
		return unix_diag_get_exact(skb, h, nlmsg_data(h));
}

static const struct sock_diag_handler unix_diag_handler = {
	.family = AF_UNIX,
	.dump = unix_diag_handler_dump,
};

static int __init unix_diag_init(void)
{
	return sock_diag_register(&unix_diag_handler);
}

static void __exit unix_diag_exit(void)
{
	sock_diag_unregister(&unix_diag_handler);
}

module_init(unix_diag_init);
module_exit(unix_diag_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);
Commit	Line	Data
22931d3b PE	1	#include <linux/types.h>
	2	#include <linux/spinlock.h>
	3	#include <linux/sock_diag.h>
	4	#include <linux/unix_diag.h>
	5	#include <linux/skbuff.h>
2ea744a5	6	#include <linux/module.h>
22931d3b PE	7	#include <net/netlink.h>
	8	#include <net/af_unix.h>
	9	#include <net/tcp_states.h>
	10
f5248b48 PE	11	static int sk_diag_dump_name(struct sock sk, struct sk_buff nlskb)
	12	{
	13	struct unix_address *addr = unix_sk(sk)->addr;
f5248b48	14
4245375d TG	15	if (!addr)
4245375d TG	16	return 0;
f5248b48	17
4245375d TG	18	return nla_put(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short),
4245375d TG	19	addr->name->sun_path);
f5248b48 PE	20	}
f5248b48 PE	21
5f7b0569 PE	22	static int sk_diag_dump_vfs(struct sock sk, struct sk_buff nlskb)
5f7b0569 PE	23	{
40ffe67d	24	struct dentry *dentry = unix_sk(sk)->path.dentry;
5f7b0569 PE	25
5f7b0569 PE	26	if (dentry) {
4245375d TG	27	struct unix_diag_vfs uv = {
	28	.udiag_vfs_ino = dentry->d_inode->i_ino,
	29	.udiag_vfs_dev = dentry->d_sb->s_dev,
	30	};
	31
	32	return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
5f7b0569 PE	33	}
	34
	35	return 0;
5f7b0569 PE	36	}
5f7b0569 PE	37
ac02be8d PE	38	static int sk_diag_dump_peer(struct sock sk, struct sk_buff nlskb)
	39	{
	40	struct sock *peer;
	41	int ino;
	42
	43	peer = unix_peer_get(sk);
	44	if (peer) {
	45	unix_state_lock(peer);
	46	ino = sock_i_ino(peer);
	47	unix_state_unlock(peer);
	48	sock_put(peer);
	49
4245375d	50	return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
ac02be8d PE	51	}
	52
	53	return 0;
ac02be8d PE	54	}
ac02be8d PE	55
2aac7a2c PE	56	static int sk_diag_dump_icons(struct sock sk, struct sk_buff nlskb)
	57	{
	58	struct sk_buff *skb;
4245375d	59	struct nlattr *attr;
2aac7a2c PE	60	u32 *buf;
	61	int i;
	62
	63	if (sk->sk_state == TCP_LISTEN) {
	64	spin_lock(&sk->sk_receive_queue.lock);
4245375d TG	65
	66	attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
	67	sk->sk_receive_queue.qlen * sizeof(u32));
	68	if (!attr)
	69	goto errout;
	70
	71	buf = nla_data(attr);
2aac7a2c PE	72	i = 0;
	73	skb_queue_walk(&sk->sk_receive_queue, skb) {
	74	struct sock req, peer;
	75
	76	req = skb->sk;
	77	/*
	78	* The state lock is outer for the same sk's
	79	* queue lock. With the other's queue locked it's
	80	* OK to lock the state.
	81	*/
	82	unix_state_lock_nested(req);
	83	peer = unix_sk(req)->peer;
e09e9d18	84	buf[i++] = (peer ? sock_i_ino(peer) : 0);
2aac7a2c PE	85	unix_state_unlock(req);
	86	}
	87	spin_unlock(&sk->sk_receive_queue.lock);
	88	}
	89
	90	return 0;
	91
4245375d	92	errout:
2aac7a2c PE	93	spin_unlock(&sk->sk_receive_queue.lock);
	94	return -EMSGSIZE;
	95	}
	96
cbf39195 PE	97	static int sk_diag_show_rqlen(struct sock sk, struct sk_buff nlskb)
cbf39195 PE	98	{
4245375d	99	struct unix_diag_rqlen rql;
c9da99e6 PE	100
c9da99e6 PE	101	if (sk->sk_state == TCP_LISTEN) {
4245375d TG	102	rql.udiag_rqueue = sk->sk_receive_queue.qlen;
4245375d TG	103	rql.udiag_wqueue = sk->sk_max_ack_backlog;
c9da99e6	104	} else {
4245375d TG	105	rql.udiag_rqueue = (u32) unix_inq_len(sk);
4245375d TG	106	rql.udiag_wqueue = (u32) unix_outq_len(sk);
c9da99e6 PE	107	}
c9da99e6 PE	108
4245375d	109	return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
cbf39195 PE	110	}
cbf39195 PE	111
45a96b9b PE	112	static int sk_diag_fill(struct sock sk, struct sk_buff skb, struct unix_diag_req *req,
	113	u32 pid, u32 seq, u32 flags, int sk_ino)
	114	{
45a96b9b PE	115	struct nlmsghdr *nlh;
	116	struct unix_diag_msg *rep;
	117
4245375d TG	118	nlh = nlmsg_put(skb, pid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
4245375d TG	119	flags);
b61bb019	120	if (!nlh)
4245375d	121	return -EMSGSIZE;
45a96b9b	122
b61bb019	123	rep = nlmsg_data(nlh);
45a96b9b PE	124	rep->udiag_family = AF_UNIX;
	125	rep->udiag_type = sk->sk_type;
	126	rep->udiag_state = sk->sk_state;
	127	rep->udiag_ino = sk_ino;
	128	sock_diag_save_cookie(sk, rep->udiag_cookie);
	129
f5248b48	130	if ((req->udiag_show & UDIAG_SHOW_NAME) &&
257b5298	131	sk_diag_dump_name(sk, skb))
b61bb019	132	goto out_nlmsg_trim;
f5248b48	133
5f7b0569	134	if ((req->udiag_show & UDIAG_SHOW_VFS) &&
257b5298	135	sk_diag_dump_vfs(sk, skb))
b61bb019	136	goto out_nlmsg_trim;
5f7b0569	137
ac02be8d	138	if ((req->udiag_show & UDIAG_SHOW_PEER) &&
257b5298	139	sk_diag_dump_peer(sk, skb))
b61bb019	140	goto out_nlmsg_trim;
ac02be8d	141
2aac7a2c	142	if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
257b5298	143	sk_diag_dump_icons(sk, skb))
b61bb019	144	goto out_nlmsg_trim;
2aac7a2c	145
cbf39195	146	if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
257b5298	147	sk_diag_show_rqlen(sk, skb))
b61bb019	148	goto out_nlmsg_trim;
257b5298 PE	149
	150	if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
	151	sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
b61bb019	152	goto out_nlmsg_trim;
cbf39195	153
4245375d	154	return nlmsg_end(skb, nlh);
45a96b9b	155
b61bb019	156	out_nlmsg_trim:
4245375d	157	nlmsg_cancel(skb, nlh);
45a96b9b PE	158	return -EMSGSIZE;
	159	}
	160
	161	static int sk_diag_dump(struct sock sk, struct sk_buff skb, struct unix_diag_req *req,
	162	u32 pid, u32 seq, u32 flags)
	163	{
	164	int sk_ino;
	165
	166	unix_state_lock(sk);
	167	sk_ino = sock_i_ino(sk);
	168	unix_state_unlock(sk);
	169
	170	if (!sk_ino)
	171	return 0;
	172
	173	return sk_diag_fill(sk, skb, req, pid, seq, flags, sk_ino);
	174	}
	175
22931d3b PE	176	static int unix_diag_dump(struct sk_buff skb, struct netlink_callback cb)
22931d3b PE	177	{
45a96b9b PE	178	struct unix_diag_req *req;
	179	int num, s_num, slot, s_slot;
	180
b61bb019	181	req = nlmsg_data(cb->nlh);
45a96b9b PE	182
	183	s_slot = cb->args[0];
	184	num = s_num = cb->args[1];
	185
	186	spin_lock(&unix_table_lock);
7123aaa3 ED	187	for (slot = s_slot;
	188	slot < ARRAY_SIZE(unix_socket_table);
	189	s_num = 0, slot++) {
45a96b9b PE	190	struct sock *sk;
	191	struct hlist_node *node;
	192
	193	num = 0;
	194	sk_for_each(sk, node, &unix_socket_table[slot]) {
	195	if (num < s_num)
	196	goto next;
	197	if (!(req->udiag_states & (1 << sk->sk_state)))
	198	goto next;
	199	if (sk_diag_dump(sk, skb, req,
257b5298 PE	200	NETLINK_CB(cb->skb).pid,
	201	cb->nlh->nlmsg_seq,
	202	NLM_F_MULTI) < 0)
45a96b9b PE	203	goto done;
	204	next:
	205	num++;
	206	}
	207	}
	208	done:
	209	spin_unlock(&unix_table_lock);
	210	cb->args[0] = slot;
	211	cb->args[1] = num;
	212
	213	return skb->len;
22931d3b PE	214	}
22931d3b PE	215
5d3cae8b PE	216	static struct sock *unix_lookup_by_ino(int ino)
	217	{
	218	int i;
	219	struct sock *sk;
	220
	221	spin_lock(&unix_table_lock);
7123aaa3	222	for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
5d3cae8b PE	223	struct hlist_node *node;
	224
	225	sk_for_each(sk, node, &unix_socket_table[i])
	226	if (ino == sock_i_ino(sk)) {
	227	sock_hold(sk);
	228	spin_unlock(&unix_table_lock);
	229
	230	return sk;
	231	}
	232	}
	233
	234	spin_unlock(&unix_table_lock);
	235	return NULL;
	236	}
	237
22931d3b PE	238	static int unix_diag_get_exact(struct sk_buff *in_skb,
	239	const struct nlmsghdr *nlh,
	240	struct unix_diag_req *req)
	241	{
5d3cae8b PE	242	int err = -EINVAL;
	243	struct sock *sk;
	244	struct sk_buff *rep;
	245	unsigned int extra_len;
	246
	247	if (req->udiag_ino == 0)
	248	goto out_nosk;
	249
	250	sk = unix_lookup_by_ino(req->udiag_ino);
	251	err = -ENOENT;
	252	if (sk == NULL)
	253	goto out_nosk;
	254
	255	err = sock_diag_check_cookie(sk, req->udiag_cookie);
	256	if (err)
	257	goto out;
	258
	259	extra_len = 256;
	260	again:
	261	err = -ENOMEM;
4245375d	262	rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
5d3cae8b PE	263	if (!rep)
	264	goto out;
	265
	266	err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).pid,
	267	nlh->nlmsg_seq, 0, req->udiag_ino);
	268	if (err < 0) {
4245375d	269	nlmsg_free(rep);
5d3cae8b PE	270	extra_len += 256;
	271	if (extra_len >= PAGE_SIZE)
	272	goto out;
	273
	274	goto again;
	275	}
	276	err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
	277	MSG_DONTWAIT);
	278	if (err > 0)
	279	err = 0;
	280	out:
	281	if (sk)
	282	sock_put(sk);
	283	out_nosk:
	284	return err;
22931d3b PE	285	}
	286
	287	static int unix_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	288	{
	289	int hdrlen = sizeof(struct unix_diag_req);
	290
	291	if (nlmsg_len(h) < hdrlen)
	292	return -EINVAL;
	293
80d326fa PNA	294	if (h->nlmsg_flags & NLM_F_DUMP) {
	295	struct netlink_dump_control c = {
	296	.dump = unix_diag_dump,
	297	};
	298	return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
	299	} else
b61bb019	300	return unix_diag_get_exact(skb, h, nlmsg_data(h));
22931d3b PE	301	}
22931d3b PE	302
8dcf01fc	303	static const struct sock_diag_handler unix_diag_handler = {
22931d3b PE	304	.family = AF_UNIX,
	305	.dump = unix_diag_handler_dump,
	306	};
	307
	308	static int __init unix_diag_init(void)
	309	{
	310	return sock_diag_register(&unix_diag_handler);
	311	}
	312
	313	static void __exit unix_diag_exit(void)
	314	{
	315	sock_diag_unregister(&unix_diag_handler);
	316	}
	317
	318	module_init(unix_diag_init);
	319	module_exit(unix_diag_exit);
	320	MODULE_LICENSE("GPL");
	321	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);