[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 = d_backing_inode(dentry)->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 portid, u32 seq, u32 flags, int sk_ino)
{
	struct nlmsghdr *nlh;
	struct unix_diag_msg *rep;

	nlh = nlmsg_put(skb, portid, 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->pad = 0;
	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;

	if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
		goto out_nlmsg_trim;

	nlmsg_end(skb, nlh);
	return 0;

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 portid, 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, portid, 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;
	struct net *net = sock_net(skb->sk);

	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;

		num = 0;
		sk_for_each(sk, &unix_socket_table[slot]) {
			if (!net_eq(sock_net(sk), net))
				continue;
			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).portid,
					 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(unsigned int ino)
{
	int i;
	struct sock *sk;

	spin_lock(&unix_table_lock);
	for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
		sk_for_each(sk, &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;
	struct net *net = sock_net(in_skb->sk);

	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).portid,
			   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(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
			      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);
	struct net *net = sock_net(skb->sk);

	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(net->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	27	struct unix_diag_vfs uv = {
a25b376b	28	.udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
4245375d TG	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	112	static int sk_diag_fill(struct sock sk, struct sk_buff skb, struct unix_diag_req *req,
15e47304	113	u32 portid, u32 seq, u32 flags, int sk_ino)
45a96b9b	114	{
45a96b9b PE	115	struct nlmsghdr *nlh;
	116	struct unix_diag_msg *rep;
	117
15e47304	118	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
4245375d	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;
6865d1e8	127	rep->pad = 0;
45a96b9b PE	128	rep->udiag_ino = sk_ino;
	129	sock_diag_save_cookie(sk, rep->udiag_cookie);
	130
f5248b48	131	if ((req->udiag_show & UDIAG_SHOW_NAME) &&
257b5298	132	sk_diag_dump_name(sk, skb))
b61bb019	133	goto out_nlmsg_trim;
f5248b48	134
5f7b0569	135	if ((req->udiag_show & UDIAG_SHOW_VFS) &&
257b5298	136	sk_diag_dump_vfs(sk, skb))
b61bb019	137	goto out_nlmsg_trim;
5f7b0569	138
ac02be8d	139	if ((req->udiag_show & UDIAG_SHOW_PEER) &&
257b5298	140	sk_diag_dump_peer(sk, skb))
b61bb019	141	goto out_nlmsg_trim;
ac02be8d	142
2aac7a2c	143	if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
257b5298	144	sk_diag_dump_icons(sk, skb))
b61bb019	145	goto out_nlmsg_trim;
2aac7a2c	146
cbf39195	147	if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
257b5298	148	sk_diag_show_rqlen(sk, skb))
b61bb019	149	goto out_nlmsg_trim;
257b5298 PE	150
	151	if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
	152	sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
b61bb019	153	goto out_nlmsg_trim;
cbf39195	154
e4e541a8 PE	155	if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
	156	goto out_nlmsg_trim;
	157
053c095a JB	158	nlmsg_end(skb, nlh);
053c095a JB	159	return 0;
45a96b9b	160
b61bb019	161	out_nlmsg_trim:
4245375d	162	nlmsg_cancel(skb, nlh);
45a96b9b PE	163	return -EMSGSIZE;
	164	}
	165
	166	static int sk_diag_dump(struct sock sk, struct sk_buff skb, struct unix_diag_req *req,
15e47304	167	u32 portid, u32 seq, u32 flags)
45a96b9b PE	168	{
	169	int sk_ino;
	170
	171	unix_state_lock(sk);
	172	sk_ino = sock_i_ino(sk);
	173	unix_state_unlock(sk);
	174
	175	if (!sk_ino)
	176	return 0;
	177
15e47304	178	return sk_diag_fill(sk, skb, req, portid, seq, flags, sk_ino);
45a96b9b PE	179	}
45a96b9b PE	180
22931d3b PE	181	static int unix_diag_dump(struct sk_buff skb, struct netlink_callback cb)
22931d3b PE	182	{
45a96b9b PE	183	struct unix_diag_req *req;
45a96b9b PE	184	int num, s_num, slot, s_slot;
51d7cccf	185	struct net *net = sock_net(skb->sk);
45a96b9b	186
b61bb019	187	req = nlmsg_data(cb->nlh);
45a96b9b PE	188
	189	s_slot = cb->args[0];
	190	num = s_num = cb->args[1];
	191
	192	spin_lock(&unix_table_lock);
7123aaa3 ED	193	for (slot = s_slot;
	194	slot < ARRAY_SIZE(unix_socket_table);
	195	s_num = 0, slot++) {
45a96b9b	196	struct sock *sk;
45a96b9b PE	197
45a96b9b PE	198	num = 0;
b67bfe0d	199	sk_for_each(sk, &unix_socket_table[slot]) {
51d7cccf AV	200	if (!net_eq(sock_net(sk), net))
51d7cccf AV	201	continue;
45a96b9b PE	202	if (num < s_num)
	203	goto next;
	204	if (!(req->udiag_states & (1 << sk->sk_state)))
	205	goto next;
	206	if (sk_diag_dump(sk, skb, req,
15e47304	207	NETLINK_CB(cb->skb).portid,
257b5298 PE	208	cb->nlh->nlmsg_seq,
257b5298 PE	209	NLM_F_MULTI) < 0)
45a96b9b PE	210	goto done;
	211	next:
	212	num++;
	213	}
	214	}
	215	done:
	216	spin_unlock(&unix_table_lock);
	217	cb->args[0] = slot;
	218	cb->args[1] = num;
	219
	220	return skb->len;
22931d3b PE	221	}
22931d3b PE	222
b5f05492	223	static struct sock *unix_lookup_by_ino(unsigned int ino)
5d3cae8b PE	224	{
	225	int i;
	226	struct sock *sk;
	227
	228	spin_lock(&unix_table_lock);
7123aaa3	229	for (i = 0; i < ARRAY_SIZE(unix_socket_table); i++) {
b67bfe0d	230	sk_for_each(sk, &unix_socket_table[i])
5d3cae8b PE	231	if (ino == sock_i_ino(sk)) {
	232	sock_hold(sk);
	233	spin_unlock(&unix_table_lock);
	234
	235	return sk;
	236	}
	237	}
	238
	239	spin_unlock(&unix_table_lock);
	240	return NULL;
	241	}
	242
22931d3b PE	243	static int unix_diag_get_exact(struct sk_buff *in_skb,
	244	const struct nlmsghdr *nlh,
	245	struct unix_diag_req *req)
	246	{
5d3cae8b PE	247	int err = -EINVAL;
	248	struct sock *sk;
	249	struct sk_buff *rep;
	250	unsigned int extra_len;
51d7cccf	251	struct net *net = sock_net(in_skb->sk);
5d3cae8b PE	252
	253	if (req->udiag_ino == 0)
	254	goto out_nosk;
	255
	256	sk = unix_lookup_by_ino(req->udiag_ino);
	257	err = -ENOENT;
	258	if (sk == NULL)
	259	goto out_nosk;
	260
	261	err = sock_diag_check_cookie(sk, req->udiag_cookie);
	262	if (err)
	263	goto out;
	264
	265	extra_len = 256;
	266	again:
	267	err = -ENOMEM;
4245375d	268	rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
5d3cae8b PE	269	if (!rep)
	270	goto out;
	271
15e47304	272	err = sk_diag_fill(sk, rep, req, NETLINK_CB(in_skb).portid,
5d3cae8b PE	273	nlh->nlmsg_seq, 0, req->udiag_ino);
5d3cae8b PE	274	if (err < 0) {
4245375d	275	nlmsg_free(rep);
5d3cae8b PE	276	extra_len += 256;
	277	if (extra_len >= PAGE_SIZE)
	278	goto out;
	279
	280	goto again;
	281	}
15e47304	282	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
5d3cae8b PE	283	MSG_DONTWAIT);
	284	if (err > 0)
	285	err = 0;
	286	out:
	287	if (sk)
	288	sock_put(sk);
	289	out_nosk:
	290	return err;
22931d3b PE	291	}
	292
	293	static int unix_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	294	{
	295	int hdrlen = sizeof(struct unix_diag_req);
51d7cccf	296	struct net *net = sock_net(skb->sk);
22931d3b PE	297
	298	if (nlmsg_len(h) < hdrlen)
	299	return -EINVAL;
	300
80d326fa PNA	301	if (h->nlmsg_flags & NLM_F_DUMP) {
	302	struct netlink_dump_control c = {
	303	.dump = unix_diag_dump,
	304	};
51d7cccf	305	return netlink_dump_start(net->diag_nlsk, skb, h, &c);
80d326fa	306	} else
b61bb019	307	return unix_diag_get_exact(skb, h, nlmsg_data(h));
22931d3b PE	308	}
22931d3b PE	309
8dcf01fc	310	static const struct sock_diag_handler unix_diag_handler = {
22931d3b PE	311	.family = AF_UNIX,
	312	.dump = unix_diag_handler_dump,
	313	};
	314
	315	static int __init unix_diag_init(void)
	316	{
	317	return sock_diag_register(&unix_diag_handler);
	318	}
	319
	320	static void __exit unix_diag_exit(void)
	321	{
	322	sock_diag_unregister(&unix_diag_handler);
	323	}
	324
	325	module_init(unix_diag_init);
	326	module_exit(unix_diag_exit);
	327	MODULE_LICENSE("GPL");
	328	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);