[thirdparty/kernel/stable.git] / net / unix / diag.c

// SPDX-License-Identifier: GPL-2.0-only
#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 <linux/uidgid.h>
#include <net/netlink.h>
#include <net/af_unix.h>
#include <net/tcp_states.h>
#include <net/sock.h>

static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
{
	/* might or might not have a hash table lock */
	struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);

	if (!addr)
		return 0;

	return nla_put(nlskb, UNIX_DIAG_NAME,
		       addr->len - offsetof(struct sockaddr_un, sun_path),
		       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_dump_uid(struct sock *sk, struct sk_buff *nlskb,
			    struct user_namespace *user_ns)
{
	uid_t uid = from_kuid_munged(user_ns, sock_i_uid(sk));
	return nla_put(nlskb, UNIX_DIAG_UID, sizeof(uid_t), &uid);
}

static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
			struct user_namespace *user_ns,
			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;

	if ((req->udiag_show & UDIAG_SHOW_UID) &&
	    sk_diag_dump_uid(sk, skb, user_ns))
		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,
			struct user_namespace *user_ns,
			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, user_ns, portid, seq, flags, sk_ino);
}

static int unix_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net *net = sock_net(skb->sk);
	int num, s_num, slot, s_slot;
	struct unix_diag_req *req;

	req = nlmsg_data(cb->nlh);

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

	for (slot = s_slot; slot < UNIX_HASH_SIZE; s_num = 0, slot++) {
		struct sock *sk;

		num = 0;
		spin_lock(&net->unx.table.locks[slot]);
		sk_for_each(sk, &net->unx.table.buckets[slot]) {
			if (num < s_num)
				goto next;
			if (!(req->udiag_states & (1 << sk->sk_state)))
				goto next;
			if (sk_diag_dump(sk, skb, req, sk_user_ns(skb->sk),
					 NETLINK_CB(cb->skb).portid,
					 cb->nlh->nlmsg_seq,
					 NLM_F_MULTI) < 0) {
				spin_unlock(&net->unx.table.locks[slot]);
				goto done;
			}
next:
			num++;
		}
		spin_unlock(&net->unx.table.locks[slot]);
	}
done:
	cb->args[0] = slot;
	cb->args[1] = num;

	return skb->len;
}

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

	for (i = 0; i < UNIX_HASH_SIZE; i++) {
		spin_lock(&net->unx.table.locks[i]);
		sk_for_each(sk, &net->unx.table.buckets[i]) {
			if (ino == sock_i_ino(sk)) {
				sock_hold(sk);
				spin_unlock(&net->unx.table.locks[i]);
				return sk;
			}
		}
		spin_unlock(&net->unx.table.locks[i]);
	}
	return NULL;
}

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

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

	sk = unix_lookup_by_ino(net, 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, sk_user_ns(NETLINK_CB(in_skb).sk),
			   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 = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);

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_net(skb->sk)->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_DESCRIPTION("UNIX socket monitoring via SOCK_DIAG");
MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
22931d3b PE	2	#include <linux/types.h>
	3	#include <linux/spinlock.h>
	4	#include <linux/sock_diag.h>
	5	#include <linux/unix_diag.h>
	6	#include <linux/skbuff.h>
2ea744a5	7	#include <linux/module.h>
cae9910e	8	#include <linux/uidgid.h>
22931d3b PE	9	#include <net/netlink.h>
	10	#include <net/af_unix.h>
	11	#include <net/tcp_states.h>
cae9910e	12	#include <net/sock.h>
22931d3b	13
f5248b48 PE	14	static int sk_diag_dump_name(struct sock sk, struct sk_buff nlskb)
f5248b48 PE	15	{
2f7ca90a	16	/* might or might not have a hash table lock */
ae3b5641	17	struct unix_address *addr = smp_load_acquire(&unix_sk(sk)->addr);
f5248b48	18
4245375d TG	19	if (!addr)
4245375d TG	20	return 0;
f5248b48	21
755662ce KI	22	return nla_put(nlskb, UNIX_DIAG_NAME,
755662ce KI	23	addr->len - offsetof(struct sockaddr_un, sun_path),
4245375d	24	addr->name->sun_path);
f5248b48 PE	25	}
f5248b48 PE	26
5f7b0569 PE	27	static int sk_diag_dump_vfs(struct sock sk, struct sk_buff nlskb)
5f7b0569 PE	28	{
40ffe67d	29	struct dentry *dentry = unix_sk(sk)->path.dentry;
5f7b0569 PE	30
5f7b0569 PE	31	if (dentry) {
4245375d	32	struct unix_diag_vfs uv = {
a25b376b	33	.udiag_vfs_ino = d_backing_inode(dentry)->i_ino,
4245375d TG	34	.udiag_vfs_dev = dentry->d_sb->s_dev,
	35	};
	36
	37	return nla_put(nlskb, UNIX_DIAG_VFS, sizeof(uv), &uv);
5f7b0569 PE	38	}
	39
	40	return 0;
5f7b0569 PE	41	}
5f7b0569 PE	42
ac02be8d PE	43	static int sk_diag_dump_peer(struct sock sk, struct sk_buff nlskb)
	44	{
	45	struct sock *peer;
	46	int ino;
	47
	48	peer = unix_peer_get(sk);
	49	if (peer) {
	50	unix_state_lock(peer);
	51	ino = sock_i_ino(peer);
	52	unix_state_unlock(peer);
	53	sock_put(peer);
	54
4245375d	55	return nla_put_u32(nlskb, UNIX_DIAG_PEER, ino);
ac02be8d PE	56	}
	57
	58	return 0;
ac02be8d PE	59	}
ac02be8d PE	60
2aac7a2c PE	61	static int sk_diag_dump_icons(struct sock sk, struct sk_buff nlskb)
	62	{
	63	struct sk_buff *skb;
4245375d	64	struct nlattr *attr;
2aac7a2c PE	65	u32 *buf;
	66	int i;
	67
	68	if (sk->sk_state == TCP_LISTEN) {
	69	spin_lock(&sk->sk_receive_queue.lock);
4245375d TG	70
	71	attr = nla_reserve(nlskb, UNIX_DIAG_ICONS,
	72	sk->sk_receive_queue.qlen * sizeof(u32));
	73	if (!attr)
	74	goto errout;
	75
	76	buf = nla_data(attr);
2aac7a2c PE	77	i = 0;
	78	skb_queue_walk(&sk->sk_receive_queue, skb) {
	79	struct sock req, peer;
	80
	81	req = skb->sk;
	82	/*
	83	* The state lock is outer for the same sk's
	84	* queue lock. With the other's queue locked it's
	85	* OK to lock the state.
	86	*/
	87	unix_state_lock_nested(req);
	88	peer = unix_sk(req)->peer;
e09e9d18	89	buf[i++] = (peer ? sock_i_ino(peer) : 0);
2aac7a2c PE	90	unix_state_unlock(req);
	91	}
	92	spin_unlock(&sk->sk_receive_queue.lock);
	93	}
	94
	95	return 0;
	96
4245375d	97	errout:
2aac7a2c PE	98	spin_unlock(&sk->sk_receive_queue.lock);
	99	return -EMSGSIZE;
	100	}
	101
cbf39195 PE	102	static int sk_diag_show_rqlen(struct sock sk, struct sk_buff nlskb)
cbf39195 PE	103	{
4245375d	104	struct unix_diag_rqlen rql;
c9da99e6 PE	105
c9da99e6 PE	106	if (sk->sk_state == TCP_LISTEN) {
4245375d TG	107	rql.udiag_rqueue = sk->sk_receive_queue.qlen;
4245375d TG	108	rql.udiag_wqueue = sk->sk_max_ack_backlog;
c9da99e6	109	} else {
4245375d TG	110	rql.udiag_rqueue = (u32) unix_inq_len(sk);
4245375d TG	111	rql.udiag_wqueue = (u32) unix_outq_len(sk);
c9da99e6 PE	112	}
c9da99e6 PE	113
4245375d	114	return nla_put(nlskb, UNIX_DIAG_RQLEN, sizeof(rql), &rql);
cbf39195 PE	115	}
cbf39195 PE	116
b3abe42e KI	117	static int sk_diag_dump_uid(struct sock sk, struct sk_buff nlskb,
b3abe42e KI	118	struct user_namespace *user_ns)
cae9910e	119	{
b3abe42e	120	uid_t uid = from_kuid_munged(user_ns, sock_i_uid(sk));
cae9910e FG	121	return nla_put(nlskb, UNIX_DIAG_UID, sizeof(uid_t), &uid);
	122	}
	123
45a96b9b	124	static int sk_diag_fill(struct sock sk, struct sk_buff skb, struct unix_diag_req *req,
b3abe42e KI	125	struct user_namespace *user_ns,
b3abe42e KI	126	u32 portid, u32 seq, u32 flags, int sk_ino)
45a96b9b	127	{
45a96b9b PE	128	struct nlmsghdr *nlh;
	129	struct unix_diag_msg *rep;
	130
15e47304	131	nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
4245375d	132	flags);
b61bb019	133	if (!nlh)
4245375d	134	return -EMSGSIZE;
45a96b9b	135
b61bb019	136	rep = nlmsg_data(nlh);
45a96b9b PE	137	rep->udiag_family = AF_UNIX;
	138	rep->udiag_type = sk->sk_type;
	139	rep->udiag_state = sk->sk_state;
6865d1e8	140	rep->pad = 0;
45a96b9b PE	141	rep->udiag_ino = sk_ino;
	142	sock_diag_save_cookie(sk, rep->udiag_cookie);
	143
f5248b48	144	if ((req->udiag_show & UDIAG_SHOW_NAME) &&
257b5298	145	sk_diag_dump_name(sk, skb))
b61bb019	146	goto out_nlmsg_trim;
f5248b48	147
5f7b0569	148	if ((req->udiag_show & UDIAG_SHOW_VFS) &&
257b5298	149	sk_diag_dump_vfs(sk, skb))
b61bb019	150	goto out_nlmsg_trim;
5f7b0569	151
ac02be8d	152	if ((req->udiag_show & UDIAG_SHOW_PEER) &&
257b5298	153	sk_diag_dump_peer(sk, skb))
b61bb019	154	goto out_nlmsg_trim;
ac02be8d	155
2aac7a2c	156	if ((req->udiag_show & UDIAG_SHOW_ICONS) &&
257b5298	157	sk_diag_dump_icons(sk, skb))
b61bb019	158	goto out_nlmsg_trim;
2aac7a2c	159
cbf39195	160	if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
257b5298	161	sk_diag_show_rqlen(sk, skb))
b61bb019	162	goto out_nlmsg_trim;
257b5298 PE	163
	164	if ((req->udiag_show & UDIAG_SHOW_MEMINFO) &&
	165	sock_diag_put_meminfo(sk, skb, UNIX_DIAG_MEMINFO))
b61bb019	166	goto out_nlmsg_trim;
cbf39195	167
e4e541a8 PE	168	if (nla_put_u8(skb, UNIX_DIAG_SHUTDOWN, sk->sk_shutdown))
	169	goto out_nlmsg_trim;
	170
cae9910e	171	if ((req->udiag_show & UDIAG_SHOW_UID) &&
b3abe42e	172	sk_diag_dump_uid(sk, skb, user_ns))
cae9910e FG	173	goto out_nlmsg_trim;
cae9910e FG	174
053c095a JB	175	nlmsg_end(skb, nlh);
053c095a JB	176	return 0;
45a96b9b	177
b61bb019	178	out_nlmsg_trim:
4245375d	179	nlmsg_cancel(skb, nlh);
45a96b9b PE	180	return -EMSGSIZE;
	181	}
	182
	183	static int sk_diag_dump(struct sock sk, struct sk_buff skb, struct unix_diag_req *req,
b3abe42e KI	184	struct user_namespace *user_ns,
b3abe42e KI	185	u32 portid, u32 seq, u32 flags)
45a96b9b PE	186	{
	187	int sk_ino;
	188
	189	unix_state_lock(sk);
	190	sk_ino = sock_i_ino(sk);
	191	unix_state_unlock(sk);
	192
	193	if (!sk_ino)
	194	return 0;
	195
b3abe42e	196	return sk_diag_fill(sk, skb, req, user_ns, portid, seq, flags, sk_ino);
45a96b9b PE	197	}
45a96b9b PE	198
22931d3b PE	199	static int unix_diag_dump(struct sk_buff skb, struct netlink_callback cb)
22931d3b PE	200	{
51d7cccf	201	struct net *net = sock_net(skb->sk);
79b05bea KI	202	int num, s_num, slot, s_slot;
79b05bea KI	203	struct unix_diag_req *req;
45a96b9b	204
b61bb019	205	req = nlmsg_data(cb->nlh);
45a96b9b PE	206
	207	s_slot = cb->args[0];
	208	num = s_num = cb->args[1];
	209
f302d180	210	for (slot = s_slot; slot < UNIX_HASH_SIZE; s_num = 0, slot++) {
45a96b9b	211	struct sock *sk;
45a96b9b PE	212
45a96b9b PE	213	num = 0;
79b05bea	214	spin_lock(&net->unx.table.locks[slot]);
cf2f225e	215	sk_for_each(sk, &net->unx.table.buckets[slot]) {
45a96b9b PE	216	if (num < s_num)
	217	goto next;
	218	if (!(req->udiag_states & (1 << sk->sk_state)))
	219	goto next;
b3abe42e	220	if (sk_diag_dump(sk, skb, req, sk_user_ns(skb->sk),
15e47304	221	NETLINK_CB(cb->skb).portid,
257b5298	222	cb->nlh->nlmsg_seq,
afd20b92	223	NLM_F_MULTI) < 0) {
79b05bea	224	spin_unlock(&net->unx.table.locks[slot]);
45a96b9b	225	goto done;
afd20b92	226	}
45a96b9b PE	227	next:
	228	num++;
	229	}
79b05bea	230	spin_unlock(&net->unx.table.locks[slot]);
45a96b9b PE	231	}
45a96b9b PE	232	done:
45a96b9b PE	233	cb->args[0] = slot;
	234	cb->args[1] = num;
	235
	236	return skb->len;
22931d3b PE	237	}
22931d3b PE	238
79b05bea	239	static struct sock unix_lookup_by_ino(struct net net, unsigned int ino)
5d3cae8b	240	{
5d3cae8b	241	struct sock *sk;
afd20b92	242	int i;
5d3cae8b	243
f302d180	244	for (i = 0; i < UNIX_HASH_SIZE; i++) {
79b05bea	245	spin_lock(&net->unx.table.locks[i]);
cf2f225e	246	sk_for_each(sk, &net->unx.table.buckets[i]) {
5d3cae8b PE	247	if (ino == sock_i_ino(sk)) {
5d3cae8b PE	248	sock_hold(sk);
79b05bea	249	spin_unlock(&net->unx.table.locks[i]);
5d3cae8b PE	250	return sk;
5d3cae8b PE	251	}
cf2f225e	252	}
79b05bea	253	spin_unlock(&net->unx.table.locks[i]);
5d3cae8b	254	}
5d3cae8b PE	255	return NULL;
	256	}
	257
22931d3b PE	258	static int unix_diag_get_exact(struct sk_buff *in_skb,
	259	const struct nlmsghdr *nlh,
	260	struct unix_diag_req *req)
	261	{
51d7cccf	262	struct net *net = sock_net(in_skb->sk);
79b05bea KI	263	unsigned int extra_len;
	264	struct sk_buff *rep;
	265	struct sock *sk;
	266	int err;
5d3cae8b	267
79b05bea	268	err = -EINVAL;
5d3cae8b PE	269	if (req->udiag_ino == 0)
	270	goto out_nosk;
	271
79b05bea	272	sk = unix_lookup_by_ino(net, req->udiag_ino);
5d3cae8b PE	273	err = -ENOENT;
	274	if (sk == NULL)
	275	goto out_nosk;
	276
	277	err = sock_diag_check_cookie(sk, req->udiag_cookie);
	278	if (err)
	279	goto out;
	280
	281	extra_len = 256;
	282	again:
	283	err = -ENOMEM;
4245375d	284	rep = nlmsg_new(sizeof(struct unix_diag_msg) + extra_len, GFP_KERNEL);
5d3cae8b PE	285	if (!rep)
	286	goto out;
	287
b3abe42e KI	288	err = sk_diag_fill(sk, rep, req, sk_user_ns(NETLINK_CB(in_skb).sk),
b3abe42e KI	289	NETLINK_CB(in_skb).portid,
5d3cae8b PE	290	nlh->nlmsg_seq, 0, req->udiag_ino);
5d3cae8b PE	291	if (err < 0) {
4245375d	292	nlmsg_free(rep);
5d3cae8b PE	293	extra_len += 256;
	294	if (extra_len >= PAGE_SIZE)
	295	goto out;
	296
	297	goto again;
	298	}
01757f53 YD	299	err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
01757f53 YD	300
5d3cae8b PE	301	out:
	302	if (sk)
	303	sock_put(sk);
	304	out_nosk:
	305	return err;
22931d3b PE	306	}
	307
	308	static int unix_diag_handler_dump(struct sk_buff skb, struct nlmsghdr h)
	309	{
	310	int hdrlen = sizeof(struct unix_diag_req);
	311
	312	if (nlmsg_len(h) < hdrlen)
	313	return -EINVAL;
	314
80d326fa PNA	315	if (h->nlmsg_flags & NLM_F_DUMP) {
	316	struct netlink_dump_control c = {
	317	.dump = unix_diag_dump,
	318	};
340c3d33	319	return netlink_dump_start(sock_net(skb->sk)->diag_nlsk, skb, h, &c);
80d326fa	320	} else
b61bb019	321	return unix_diag_get_exact(skb, h, nlmsg_data(h));
22931d3b PE	322	}
22931d3b PE	323
8dcf01fc	324	static const struct sock_diag_handler unix_diag_handler = {
22931d3b PE	325	.family = AF_UNIX,
	326	.dump = unix_diag_handler_dump,
	327	};
	328
	329	static int __init unix_diag_init(void)
	330	{
	331	return sock_diag_register(&unix_diag_handler);
	332	}
	333
	334	static void __exit unix_diag_exit(void)
	335	{
	336	sock_diag_unregister(&unix_diag_handler);
	337	}
	338
	339	module_init(unix_diag_init);
	340	module_exit(unix_diag_exit);
	341	MODULE_LICENSE("GPL");
938dbead	342	MODULE_DESCRIPTION("UNIX socket monitoring via SOCK_DIAG");
22931d3b	343	MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 1 /* AF_LOCAL */);