1 /*
2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
4
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation;
10
11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19
20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
22 SOFTWARE IS DISCLAIMED.
23 */
24
25 /* Bluetooth HCI connection handling. */
26
27 #include <linux/module.h>
28
29 #include <linux/types.h>
30 #include <linux/errno.h>
31 #include <linux/kernel.h>
32 #include <linux/slab.h>
33 #include <linux/poll.h>
34 #include <linux/fcntl.h>
35 #include <linux/init.h>
36 #include <linux/skbuff.h>
37 #include <linux/interrupt.h>
38 #include <linux/notifier.h>
39 #include <net/sock.h>
40
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
43 #include <asm/unaligned.h>
44
45 #include <net/bluetooth/bluetooth.h>
46 #include <net/bluetooth/hci_core.h>
47
48 void hci_acl_connect(struct hci_conn *conn)
49 {
50 struct hci_dev *hdev = conn->hdev;
51 struct inquiry_entry *ie;
52 struct hci_cp_create_conn cp;
53
54 BT_DBG("%p", conn);
55
56 conn->state = BT_CONNECT;
57 conn->out = 1;
58
59 conn->link_mode = HCI_LM_MASTER;
60
61 conn->attempt++;
62
63 conn->link_policy = hdev->link_policy;
64
65 memset(&cp, 0, sizeof(cp));
66 bacpy(&cp.bdaddr, &conn->dst);
67 cp.pscan_rep_mode = 0x02;
68
69 if ((ie = hci_inquiry_cache_lookup(hdev, &conn->dst))) {
70 if (inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) {
71 cp.pscan_rep_mode = ie->data.pscan_rep_mode;
72 cp.pscan_mode = ie->data.pscan_mode;
73 cp.clock_offset = ie->data.clock_offset |
74 cpu_to_le16(0x8000);
75 }
76
77 memcpy(conn->dev_class, ie->data.dev_class, 3);
78 conn->ssp_mode = ie->data.ssp_mode;
79 }
80
81 cp.pkt_type = cpu_to_le16(conn->pkt_type);
82 if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER))
83 cp.role_switch = 0x01;
84 else
85 cp.role_switch = 0x00;
86
87 hci_send_cmd(hdev, HCI_OP_CREATE_CONN, sizeof(cp), &cp);
88 }
89
90 static void hci_acl_connect_cancel(struct hci_conn *conn)
91 {
92 struct hci_cp_create_conn_cancel cp;
93
94 BT_DBG("%p", conn);
95
96 if (conn->hdev->hci_ver < 2)
97 return;
98
99 bacpy(&cp.bdaddr, &conn->dst);
100 hci_send_cmd(conn->hdev, HCI_OP_CREATE_CONN_CANCEL, sizeof(cp), &cp);
101 }
102
103 void hci_acl_disconn(struct hci_conn *conn, __u8 reason)
104 {
105 struct hci_cp_disconnect cp;
106
107 BT_DBG("%p", conn);
108
109 conn->state = BT_DISCONN;
110
111 cp.handle = cpu_to_le16(conn->handle);
112 cp.reason = reason;
113 hci_send_cmd(conn->hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp);
114 }
115
116 void hci_add_sco(struct hci_conn *conn, __u16 handle)
117 {
118 struct hci_dev *hdev = conn->hdev;
119 struct hci_cp_add_sco cp;
120
121 BT_DBG("%p", conn);
122
123 conn->state = BT_CONNECT;
124 conn->out = 1;
125
126 conn->attempt++;
127
128 cp.handle = cpu_to_le16(handle);
129 cp.pkt_type = cpu_to_le16(conn->pkt_type);
130
131 hci_send_cmd(hdev, HCI_OP_ADD_SCO, sizeof(cp), &cp);
132 }
133
134 void hci_setup_sync(struct hci_conn *conn, __u16 handle)
135 {
136 struct hci_dev *hdev = conn->hdev;
137 struct hci_cp_setup_sync_conn cp;
138
139 BT_DBG("%p", conn);
140
141 conn->state = BT_CONNECT;
142 conn->out = 1;
143
144 conn->attempt++;
145
146 cp.handle = cpu_to_le16(handle);
147 cp.pkt_type = cpu_to_le16(conn->pkt_type);
148
149 cp.tx_bandwidth = cpu_to_le32(0x00001f40);
150 cp.rx_bandwidth = cpu_to_le32(0x00001f40);
151 cp.max_latency = cpu_to_le16(0xffff);
152 cp.voice_setting = cpu_to_le16(hdev->voice_setting);
153 cp.retrans_effort = 0xff;
154
155 hci_send_cmd(hdev, HCI_OP_SETUP_SYNC_CONN, sizeof(cp), &cp);
156 }
157
158 static void hci_conn_timeout(unsigned long arg)
159 {
160 struct hci_conn *conn = (void *) arg;
161 struct hci_dev *hdev = conn->hdev;
162 __u8 reason;
163
164 BT_DBG("conn %p state %d", conn, conn->state);
165
166 if (atomic_read(&conn->refcnt))
167 return;
168
169 hci_dev_lock(hdev);
170
171 switch (conn->state) {
172 case BT_CONNECT:
173 case BT_CONNECT2:
174 if (conn->type == ACL_LINK && conn->out)
175 hci_acl_connect_cancel(conn);
176 break;
177 case BT_CONFIG:
178 case BT_CONNECTED:
179 reason = hci_proto_disconn_ind(conn);
180 hci_acl_disconn(conn, reason);
181 break;
182 default:
183 conn->state = BT_CLOSED;
184 break;
185 }
186
187 hci_dev_unlock(hdev);
188 }
189
190 static void hci_conn_idle(unsigned long arg)
191 {
192 struct hci_conn *conn = (void *) arg;
193
194 BT_DBG("conn %p mode %d", conn, conn->mode);
195
196 hci_conn_enter_sniff_mode(conn);
197 }
198
199 struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst)
200 {
201 struct hci_conn *conn;
202
203 BT_DBG("%s dst %s", hdev->name, batostr(dst));
204
205 conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC);
206 if (!conn)
207 return NULL;
208
209 bacpy(&conn->dst, dst);
210 conn->hdev = hdev;
211 conn->type = type;
212 conn->mode = HCI_CM_ACTIVE;
213 conn->state = BT_OPEN;
214
215 conn->power_save = 1;
216 conn->disc_timeout = HCI_DISCONN_TIMEOUT;
217
218 switch (type) {
219 case ACL_LINK:
220 conn->pkt_type = hdev->pkt_type & ACL_PTYPE_MASK;
221 break;
222 case SCO_LINK:
223 if (lmp_esco_capable(hdev))
224 conn->pkt_type = (hdev->esco_type & SCO_ESCO_MASK) |
225 (hdev->esco_type & EDR_ESCO_MASK);
226 else
227 conn->pkt_type = hdev->pkt_type & SCO_PTYPE_MASK;
228 break;
229 case ESCO_LINK:
230 conn->pkt_type = hdev->esco_type & ~EDR_ESCO_MASK;
231 break;
232 }
233
234 skb_queue_head_init(&conn->data_q);
235
236 setup_timer(&conn->disc_timer, hci_conn_timeout, (unsigned long)conn);
237 setup_timer(&conn->idle_timer, hci_conn_idle, (unsigned long)conn);
238
239 atomic_set(&conn->refcnt, 0);
240
241 hci_dev_hold(hdev);
242
243 tasklet_disable(&hdev->tx_task);
244
245 hci_conn_hash_add(hdev, conn);
246 if (hdev->notify)
247 hdev->notify(hdev, HCI_NOTIFY_CONN_ADD);
248
249 atomic_set(&conn->devref, 0);
250
251 hci_conn_init_sysfs(conn);
252
253 tasklet_enable(&hdev->tx_task);
254
255 return conn;
256 }
257
258 int hci_conn_del(struct hci_conn *conn)
259 {
260 struct hci_dev *hdev = conn->hdev;
261
262 BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle);
263
264 del_timer(&conn->idle_timer);
265
266 del_timer(&conn->disc_timer);
267
268 if (conn->type == ACL_LINK) {
269 struct hci_conn *sco = conn->link;
270 if (sco)
271 sco->link = NULL;
272
273 /* Unacked frames */
274 hdev->acl_cnt += conn->sent;
275 } else {
276 struct hci_conn *acl = conn->link;
277 if (acl) {
278 acl->link = NULL;
279 hci_conn_put(acl);
280 }
281 }
282
283 tasklet_disable(&hdev->tx_task);
284
285 hci_conn_hash_del(hdev, conn);
286 if (hdev->notify)
287 hdev->notify(hdev, HCI_NOTIFY_CONN_DEL);
288
289 tasklet_enable(&hdev->tx_task);
290
291 skb_queue_purge(&conn->data_q);
292
293 hci_conn_put_device(conn);
294
295 hci_dev_put(hdev);
296
297 return 0;
298 }
299
300 struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src)
301 {
302 int use_src = bacmp(src, BDADDR_ANY);
303 struct hci_dev *hdev = NULL;
304 struct list_head *p;
305
306 BT_DBG("%s -> %s", batostr(src), batostr(dst));
307
308 read_lock_bh(&hci_dev_list_lock);
309
310 list_for_each(p, &hci_dev_list) {
311 struct hci_dev *d = list_entry(p, struct hci_dev, list);
312
313 if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags))
314 continue;
315
316 /* Simple routing:
317 * No source address - find interface with bdaddr != dst
318 * Source address - find interface with bdaddr == src
319 */
320
321 if (use_src) {
322 if (!bacmp(&d->bdaddr, src)) {
323 hdev = d; break;
324 }
325 } else {
326 if (bacmp(&d->bdaddr, dst)) {
327 hdev = d; break;
328 }
329 }
330 }
331
332 if (hdev)
333 hdev = hci_dev_hold(hdev);
334
335 read_unlock_bh(&hci_dev_list_lock);
336 return hdev;
337 }
338 EXPORT_SYMBOL(hci_get_route);
339
340 /* Create SCO or ACL connection.
341 * Device _must_ be locked */
342 struct hci_conn *hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst, __u8 sec_level, __u8 auth_type)
343 {
344 struct hci_conn *acl;
345 struct hci_conn *sco;
346
347 BT_DBG("%s dst %s", hdev->name, batostr(dst));
348
349 if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) {
350 if (!(acl = hci_conn_add(hdev, ACL_LINK, dst)))
351 return NULL;
352 }
353
354 hci_conn_hold(acl);
355
356 if (acl->state == BT_OPEN || acl->state == BT_CLOSED) {
357 acl->sec_level = sec_level;
358 acl->auth_type = auth_type;
359 hci_acl_connect(acl);
360 }
361
362 if (type == ACL_LINK)
363 return acl;
364
365 if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
366 if (!(sco = hci_conn_add(hdev, type, dst))) {
367 hci_conn_put(acl);
368 return NULL;
369 }
370 }
371
372 acl->link = sco;
373 sco->link = acl;
374
375 hci_conn_hold(sco);
376
377 if (acl->state == BT_CONNECTED &&
378 (sco->state == BT_OPEN || sco->state == BT_CLOSED)) {
379 if (lmp_esco_capable(hdev))
380 hci_setup_sync(sco, acl->handle);
381 else
382 hci_add_sco(sco, acl->handle);
383 }
384
385 return sco;
386 }
387 EXPORT_SYMBOL(hci_connect);
388
389 /* Check link security requirement */
390 int hci_conn_check_link_mode(struct hci_conn *conn)
391 {
392 BT_DBG("conn %p", conn);
393
394 if (conn->ssp_mode > 0 && conn->hdev->ssp_mode > 0 &&
395 !(conn->link_mode & HCI_LM_ENCRYPT))
396 return 0;
397
398 return 1;
399 }
400 EXPORT_SYMBOL(hci_conn_check_link_mode);
401
402 /* Authenticate remote device */
403 static int hci_conn_auth(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
404 {
405 BT_DBG("conn %p", conn);
406
407 if (sec_level > conn->sec_level)
408 conn->sec_level = sec_level;
409 else if (conn->link_mode & HCI_LM_AUTH)
410 return 1;
411
412 conn->auth_type = auth_type;
413
414 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
415 struct hci_cp_auth_requested cp;
416 cp.handle = cpu_to_le16(conn->handle);
417 hci_send_cmd(conn->hdev, HCI_OP_AUTH_REQUESTED,
418 sizeof(cp), &cp);
419 }
420
421 return 0;
422 }
423
424 /* Enable security */
425 int hci_conn_security(struct hci_conn *conn, __u8 sec_level, __u8 auth_type)
426 {
427 BT_DBG("conn %p", conn);
428
429 if (sec_level == BT_SECURITY_SDP)
430 return 1;
431
432 if (sec_level == BT_SECURITY_LOW &&
433 (!conn->ssp_mode || !conn->hdev->ssp_mode))
434 return 1;
435
436 if (conn->link_mode & HCI_LM_ENCRYPT)
437 return hci_conn_auth(conn, sec_level, auth_type);
438
439 if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend))
440 return 0;
441
442 if (hci_conn_auth(conn, sec_level, auth_type)) {
443 struct hci_cp_set_conn_encrypt cp;
444 cp.handle = cpu_to_le16(conn->handle);
445 cp.encrypt = 1;
446 hci_send_cmd(conn->hdev, HCI_OP_SET_CONN_ENCRYPT,
447 sizeof(cp), &cp);
448 }
449
450 return 0;
451 }
452 EXPORT_SYMBOL(hci_conn_security);
453
454 /* Change link key */
455 int hci_conn_change_link_key(struct hci_conn *conn)
456 {
457 BT_DBG("conn %p", conn);
458
459 if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) {
460 struct hci_cp_change_conn_link_key cp;
461 cp.handle = cpu_to_le16(conn->handle);
462 hci_send_cmd(conn->hdev, HCI_OP_CHANGE_CONN_LINK_KEY,
463 sizeof(cp), &cp);
464 }
465
466 return 0;
467 }
468 EXPORT_SYMBOL(hci_conn_change_link_key);
469
470 /* Switch role */
471 int hci_conn_switch_role(struct hci_conn *conn, __u8 role)
472 {
473 BT_DBG("conn %p", conn);
474
475 if (!role && conn->link_mode & HCI_LM_MASTER)
476 return 1;
477
478 if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) {
479 struct hci_cp_switch_role cp;
480 bacpy(&cp.bdaddr, &conn->dst);
481 cp.role = role;
482 hci_send_cmd(conn->hdev, HCI_OP_SWITCH_ROLE, sizeof(cp), &cp);
483 }
484
485 return 0;
486 }
487 EXPORT_SYMBOL(hci_conn_switch_role);
488
489 /* Enter active mode */
490 void hci_conn_enter_active_mode(struct hci_conn *conn)
491 {
492 struct hci_dev *hdev = conn->hdev;
493
494 BT_DBG("conn %p mode %d", conn, conn->mode);
495
496 if (test_bit(HCI_RAW, &hdev->flags))
497 return;
498
499 if (conn->mode != HCI_CM_SNIFF || !conn->power_save)
500 goto timer;
501
502 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
503 struct hci_cp_exit_sniff_mode cp;
504 cp.handle = cpu_to_le16(conn->handle);
505 hci_send_cmd(hdev, HCI_OP_EXIT_SNIFF_MODE, sizeof(cp), &cp);
506 }
507
508 timer:
509 if (hdev->idle_timeout > 0)
510 mod_timer(&conn->idle_timer,
511 jiffies + msecs_to_jiffies(hdev->idle_timeout));
512 }
513
514 /* Enter sniff mode */
515 void hci_conn_enter_sniff_mode(struct hci_conn *conn)
516 {
517 struct hci_dev *hdev = conn->hdev;
518
519 BT_DBG("conn %p mode %d", conn, conn->mode);
520
521 if (test_bit(HCI_RAW, &hdev->flags))
522 return;
523
524 if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn))
525 return;
526
527 if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF))
528 return;
529
530 if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) {
531 struct hci_cp_sniff_subrate cp;
532 cp.handle = cpu_to_le16(conn->handle);
533 cp.max_latency = cpu_to_le16(0);
534 cp.min_remote_timeout = cpu_to_le16(0);
535 cp.min_local_timeout = cpu_to_le16(0);
536 hci_send_cmd(hdev, HCI_OP_SNIFF_SUBRATE, sizeof(cp), &cp);
537 }
538
539 if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) {
540 struct hci_cp_sniff_mode cp;
541 cp.handle = cpu_to_le16(conn->handle);
542 cp.max_interval = cpu_to_le16(hdev->sniff_max_interval);
543 cp.min_interval = cpu_to_le16(hdev->sniff_min_interval);
544 cp.attempt = cpu_to_le16(4);
545 cp.timeout = cpu_to_le16(1);
546 hci_send_cmd(hdev, HCI_OP_SNIFF_MODE, sizeof(cp), &cp);
547 }
548 }
549
550 /* Drop all connection on the device */
551 void hci_conn_hash_flush(struct hci_dev *hdev)
552 {
553 struct hci_conn_hash *h = &hdev->conn_hash;
554 struct list_head *p;
555
556 BT_DBG("hdev %s", hdev->name);
557
558 p = h->list.next;
559 while (p != &h->list) {
560 struct hci_conn *c;
561
562 c = list_entry(p, struct hci_conn, list);
563 p = p->next;
564
565 c->state = BT_CLOSED;
566
567 hci_proto_disconn_cfm(c, 0x16);
568 hci_conn_del(c);
569 }
570 }
571
572 /* Check pending connect attempts */
573 void hci_conn_check_pending(struct hci_dev *hdev)
574 {
575 struct hci_conn *conn;
576
577 BT_DBG("hdev %s", hdev->name);
578
579 hci_dev_lock(hdev);
580
581 conn = hci_conn_hash_lookup_state(hdev, ACL_LINK, BT_CONNECT2);
582 if (conn)
583 hci_acl_connect(conn);
584
585 hci_dev_unlock(hdev);
586 }
587
588 void hci_conn_hold_device(struct hci_conn *conn)
589 {
590 atomic_inc(&conn->devref);
591 }
592 EXPORT_SYMBOL(hci_conn_hold_device);
593
594 void hci_conn_put_device(struct hci_conn *conn)
595 {
596 if (atomic_dec_and_test(&conn->devref))
597 hci_conn_del_sysfs(conn);
598 }
599 EXPORT_SYMBOL(hci_conn_put_device);
600
601 int hci_get_conn_list(void __user *arg)
602 {
603 struct hci_conn_list_req req, *cl;
604 struct hci_conn_info *ci;
605 struct hci_dev *hdev;
606 struct list_head *p;
607 int n = 0, size, err;
608
609 if (copy_from_user(&req, arg, sizeof(req)))
610 return -EFAULT;
611
612 if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci))
613 return -EINVAL;
614
615 size = sizeof(req) + req.conn_num * sizeof(*ci);
616
617 if (!(cl = kmalloc(size, GFP_KERNEL)))
618 return -ENOMEM;
619
620 if (!(hdev = hci_dev_get(req.dev_id))) {
621 kfree(cl);
622 return -ENODEV;
623 }
624
625 ci = cl->conn_info;
626
627 hci_dev_lock_bh(hdev);
628 list_for_each(p, &hdev->conn_hash.list) {
629 register struct hci_conn *c;
630 c = list_entry(p, struct hci_conn, list);
631
632 bacpy(&(ci + n)->bdaddr, &c->dst);
633 (ci + n)->handle = c->handle;
634 (ci + n)->type = c->type;
635 (ci + n)->out = c->out;
636 (ci + n)->state = c->state;
637 (ci + n)->link_mode = c->link_mode;
638 if (++n >= req.conn_num)
639 break;
640 }
641 hci_dev_unlock_bh(hdev);
642
643 cl->dev_id = hdev->id;
644 cl->conn_num = n;
645 size = sizeof(req) + n * sizeof(*ci);
646
647 hci_dev_put(hdev);
648
649 err = copy_to_user(arg, cl, size);
650 kfree(cl);
651
652 return err ? -EFAULT : 0;
653 }
654
655 int hci_get_conn_info(struct hci_dev *hdev, void __user *arg)
656 {
657 struct hci_conn_info_req req;
658 struct hci_conn_info ci;
659 struct hci_conn *conn;
660 char __user *ptr = arg + sizeof(req);
661
662 if (copy_from_user(&req, arg, sizeof(req)))
663 return -EFAULT;
664
665 hci_dev_lock_bh(hdev);
666 conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr);
667 if (conn) {
668 bacpy(&ci.bdaddr, &conn->dst);
669 ci.handle = conn->handle;
670 ci.type = conn->type;
671 ci.out = conn->out;
672 ci.state = conn->state;
673 ci.link_mode = conn->link_mode;
674 }
675 hci_dev_unlock_bh(hdev);
676
677 if (!conn)
678 return -ENOENT;
679
680 return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0;
681 }
682
683 int hci_get_auth_info(struct hci_dev *hdev, void __user *arg)
684 {
685 struct hci_auth_info_req req;
686 struct hci_conn *conn;
687
688 if (copy_from_user(&req, arg, sizeof(req)))
689 return -EFAULT;
690
691 hci_dev_lock_bh(hdev);
692 conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &req.bdaddr);
693 if (conn)
694 req.type = conn->auth_type;
695 hci_dev_unlock_bh(hdev);
696
697 if (!conn)
698 return -ENOENT;
699
700 return copy_to_user(arg, &req, sizeof(req)) ? -EFAULT : 0;
701 }
702
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