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1da177e4 LT |
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 | ||
1da177e4 LT |
27 | #include <linux/module.h> |
28 | ||
29 | #include <linux/types.h> | |
30 | #include <linux/errno.h> | |
31 | #include <linux/kernel.h> | |
1da177e4 LT |
32 | #include <linux/sched.h> |
33 | #include <linux/slab.h> | |
34 | #include <linux/poll.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/skbuff.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/notifier.h> | |
40 | #include <net/sock.h> | |
41 | ||
42 | #include <asm/system.h> | |
43 | #include <asm/uaccess.h> | |
44 | #include <asm/unaligned.h> | |
45 | ||
46 | #include <net/bluetooth/bluetooth.h> | |
47 | #include <net/bluetooth/hci_core.h> | |
48 | ||
49 | #ifndef CONFIG_BT_HCI_CORE_DEBUG | |
50 | #undef BT_DBG | |
51 | #define BT_DBG(D...) | |
52 | #endif | |
53 | ||
54 | static void hci_acl_connect(struct hci_conn *conn) | |
55 | { | |
56 | struct hci_dev *hdev = conn->hdev; | |
57 | struct inquiry_entry *ie; | |
58 | struct hci_cp_create_conn cp; | |
59 | ||
60 | BT_DBG("%p", conn); | |
61 | ||
62 | conn->state = BT_CONNECT; | |
63 | conn->out = 1; | |
64 | conn->link_mode = HCI_LM_MASTER; | |
65 | ||
66 | memset(&cp, 0, sizeof(cp)); | |
67 | bacpy(&cp.bdaddr, &conn->dst); | |
68 | cp.pscan_rep_mode = 0x02; | |
69 | ||
70 | if ((ie = hci_inquiry_cache_lookup(hdev, &conn->dst)) && | |
71 | inquiry_entry_age(ie) <= INQUIRY_ENTRY_AGE_MAX) { | |
72 | cp.pscan_rep_mode = ie->data.pscan_rep_mode; | |
73 | cp.pscan_mode = ie->data.pscan_mode; | |
74 | cp.clock_offset = ie->data.clock_offset | __cpu_to_le16(0x8000); | |
75 | memcpy(conn->dev_class, ie->data.dev_class, 3); | |
76 | } | |
77 | ||
78 | cp.pkt_type = __cpu_to_le16(hdev->pkt_type & ACL_PTYPE_MASK); | |
79 | if (lmp_rswitch_capable(hdev) && !(hdev->link_mode & HCI_LM_MASTER)) | |
80 | cp.role_switch = 0x01; | |
81 | else | |
82 | cp.role_switch = 0x00; | |
83 | ||
84 | hci_send_cmd(hdev, OGF_LINK_CTL, OCF_CREATE_CONN, sizeof(cp), &cp); | |
85 | } | |
86 | ||
87 | void hci_acl_disconn(struct hci_conn *conn, __u8 reason) | |
88 | { | |
89 | struct hci_cp_disconnect cp; | |
90 | ||
91 | BT_DBG("%p", conn); | |
92 | ||
93 | conn->state = BT_DISCONN; | |
94 | ||
95 | cp.handle = __cpu_to_le16(conn->handle); | |
96 | cp.reason = reason; | |
97 | hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_DISCONNECT, sizeof(cp), &cp); | |
98 | } | |
99 | ||
100 | void hci_add_sco(struct hci_conn *conn, __u16 handle) | |
101 | { | |
102 | struct hci_dev *hdev = conn->hdev; | |
103 | struct hci_cp_add_sco cp; | |
104 | ||
105 | BT_DBG("%p", conn); | |
106 | ||
107 | conn->state = BT_CONNECT; | |
108 | conn->out = 1; | |
109 | ||
110 | cp.pkt_type = __cpu_to_le16(hdev->pkt_type & SCO_PTYPE_MASK); | |
111 | cp.handle = __cpu_to_le16(handle); | |
112 | ||
113 | hci_send_cmd(hdev, OGF_LINK_CTL, OCF_ADD_SCO, sizeof(cp), &cp); | |
114 | } | |
115 | ||
116 | static void hci_conn_timeout(unsigned long arg) | |
117 | { | |
04837f64 MH |
118 | struct hci_conn *conn = (void *) arg; |
119 | struct hci_dev *hdev = conn->hdev; | |
1da177e4 LT |
120 | |
121 | BT_DBG("conn %p state %d", conn, conn->state); | |
122 | ||
123 | if (atomic_read(&conn->refcnt)) | |
124 | return; | |
125 | ||
126 | hci_dev_lock(hdev); | |
127 | if (conn->state == BT_CONNECTED) | |
128 | hci_acl_disconn(conn, 0x13); | |
129 | else | |
130 | conn->state = BT_CLOSED; | |
131 | hci_dev_unlock(hdev); | |
132 | return; | |
133 | } | |
134 | ||
04837f64 | 135 | static void hci_conn_idle(unsigned long arg) |
1da177e4 | 136 | { |
04837f64 MH |
137 | struct hci_conn *conn = (void *) arg; |
138 | ||
139 | BT_DBG("conn %p mode %d", conn, conn->mode); | |
140 | ||
141 | hci_conn_enter_sniff_mode(conn); | |
1da177e4 LT |
142 | } |
143 | ||
144 | struct hci_conn *hci_conn_add(struct hci_dev *hdev, int type, bdaddr_t *dst) | |
145 | { | |
146 | struct hci_conn *conn; | |
147 | ||
148 | BT_DBG("%s dst %s", hdev->name, batostr(dst)); | |
149 | ||
04837f64 MH |
150 | conn = kzalloc(sizeof(struct hci_conn), GFP_ATOMIC); |
151 | if (!conn) | |
1da177e4 | 152 | return NULL; |
1da177e4 LT |
153 | |
154 | bacpy(&conn->dst, dst); | |
1da177e4 | 155 | conn->hdev = hdev; |
04837f64 MH |
156 | conn->type = type; |
157 | conn->mode = HCI_CM_ACTIVE; | |
1da177e4 LT |
158 | conn->state = BT_OPEN; |
159 | ||
04837f64 MH |
160 | conn->power_save = 1; |
161 | ||
1da177e4 | 162 | skb_queue_head_init(&conn->data_q); |
04837f64 MH |
163 | |
164 | init_timer(&conn->disc_timer); | |
165 | conn->disc_timer.function = hci_conn_timeout; | |
166 | conn->disc_timer.data = (unsigned long) conn; | |
167 | ||
168 | init_timer(&conn->idle_timer); | |
169 | conn->idle_timer.function = hci_conn_idle; | |
170 | conn->idle_timer.data = (unsigned long) conn; | |
1da177e4 LT |
171 | |
172 | atomic_set(&conn->refcnt, 0); | |
173 | ||
174 | hci_dev_hold(hdev); | |
175 | ||
176 | tasklet_disable(&hdev->tx_task); | |
177 | ||
178 | hci_conn_hash_add(hdev, conn); | |
179 | if (hdev->notify) | |
180 | hdev->notify(hdev, HCI_NOTIFY_CONN_ADD); | |
181 | ||
182 | tasklet_enable(&hdev->tx_task); | |
183 | ||
184 | return conn; | |
185 | } | |
186 | ||
187 | int hci_conn_del(struct hci_conn *conn) | |
188 | { | |
189 | struct hci_dev *hdev = conn->hdev; | |
190 | ||
191 | BT_DBG("%s conn %p handle %d", hdev->name, conn, conn->handle); | |
192 | ||
04837f64 MH |
193 | del_timer(&conn->idle_timer); |
194 | ||
195 | del_timer(&conn->disc_timer); | |
1da177e4 LT |
196 | |
197 | if (conn->type == SCO_LINK) { | |
198 | struct hci_conn *acl = conn->link; | |
199 | if (acl) { | |
200 | acl->link = NULL; | |
201 | hci_conn_put(acl); | |
202 | } | |
203 | } else { | |
204 | struct hci_conn *sco = conn->link; | |
205 | if (sco) | |
206 | sco->link = NULL; | |
207 | ||
208 | /* Unacked frames */ | |
209 | hdev->acl_cnt += conn->sent; | |
210 | } | |
211 | ||
212 | tasklet_disable(&hdev->tx_task); | |
213 | ||
214 | hci_conn_hash_del(hdev, conn); | |
215 | if (hdev->notify) | |
216 | hdev->notify(hdev, HCI_NOTIFY_CONN_DEL); | |
217 | ||
218 | tasklet_enable(&hdev->tx_task); | |
219 | ||
220 | skb_queue_purge(&conn->data_q); | |
221 | ||
222 | hci_dev_put(hdev); | |
223 | ||
224 | kfree(conn); | |
225 | return 0; | |
226 | } | |
227 | ||
228 | struct hci_dev *hci_get_route(bdaddr_t *dst, bdaddr_t *src) | |
229 | { | |
230 | int use_src = bacmp(src, BDADDR_ANY); | |
231 | struct hci_dev *hdev = NULL; | |
232 | struct list_head *p; | |
233 | ||
234 | BT_DBG("%s -> %s", batostr(src), batostr(dst)); | |
235 | ||
236 | read_lock_bh(&hci_dev_list_lock); | |
237 | ||
238 | list_for_each(p, &hci_dev_list) { | |
239 | struct hci_dev *d = list_entry(p, struct hci_dev, list); | |
240 | ||
241 | if (!test_bit(HCI_UP, &d->flags) || test_bit(HCI_RAW, &d->flags)) | |
242 | continue; | |
243 | ||
244 | /* Simple routing: | |
245 | * No source address - find interface with bdaddr != dst | |
246 | * Source address - find interface with bdaddr == src | |
247 | */ | |
248 | ||
249 | if (use_src) { | |
250 | if (!bacmp(&d->bdaddr, src)) { | |
251 | hdev = d; break; | |
252 | } | |
253 | } else { | |
254 | if (bacmp(&d->bdaddr, dst)) { | |
255 | hdev = d; break; | |
256 | } | |
257 | } | |
258 | } | |
259 | ||
260 | if (hdev) | |
261 | hdev = hci_dev_hold(hdev); | |
262 | ||
263 | read_unlock_bh(&hci_dev_list_lock); | |
264 | return hdev; | |
265 | } | |
266 | EXPORT_SYMBOL(hci_get_route); | |
267 | ||
268 | /* Create SCO or ACL connection. | |
269 | * Device _must_ be locked */ | |
270 | struct hci_conn * hci_connect(struct hci_dev *hdev, int type, bdaddr_t *dst) | |
271 | { | |
272 | struct hci_conn *acl; | |
273 | ||
274 | BT_DBG("%s dst %s", hdev->name, batostr(dst)); | |
275 | ||
276 | if (!(acl = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst))) { | |
277 | if (!(acl = hci_conn_add(hdev, ACL_LINK, dst))) | |
278 | return NULL; | |
279 | } | |
280 | ||
281 | hci_conn_hold(acl); | |
282 | ||
283 | if (acl->state == BT_OPEN || acl->state == BT_CLOSED) | |
284 | hci_acl_connect(acl); | |
285 | ||
286 | if (type == SCO_LINK) { | |
287 | struct hci_conn *sco; | |
288 | ||
289 | if (!(sco = hci_conn_hash_lookup_ba(hdev, SCO_LINK, dst))) { | |
290 | if (!(sco = hci_conn_add(hdev, SCO_LINK, dst))) { | |
291 | hci_conn_put(acl); | |
292 | return NULL; | |
293 | } | |
294 | } | |
295 | acl->link = sco; | |
296 | sco->link = acl; | |
297 | ||
298 | hci_conn_hold(sco); | |
299 | ||
300 | if (acl->state == BT_CONNECTED && | |
301 | (sco->state == BT_OPEN || sco->state == BT_CLOSED)) | |
302 | hci_add_sco(sco, acl->handle); | |
303 | ||
304 | return sco; | |
305 | } else { | |
306 | return acl; | |
307 | } | |
308 | } | |
309 | EXPORT_SYMBOL(hci_connect); | |
310 | ||
311 | /* Authenticate remote device */ | |
312 | int hci_conn_auth(struct hci_conn *conn) | |
313 | { | |
314 | BT_DBG("conn %p", conn); | |
315 | ||
316 | if (conn->link_mode & HCI_LM_AUTH) | |
317 | return 1; | |
318 | ||
319 | if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) { | |
320 | struct hci_cp_auth_requested cp; | |
321 | cp.handle = __cpu_to_le16(conn->handle); | |
322 | hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_AUTH_REQUESTED, sizeof(cp), &cp); | |
323 | } | |
324 | return 0; | |
325 | } | |
326 | EXPORT_SYMBOL(hci_conn_auth); | |
327 | ||
328 | /* Enable encryption */ | |
329 | int hci_conn_encrypt(struct hci_conn *conn) | |
330 | { | |
331 | BT_DBG("conn %p", conn); | |
332 | ||
333 | if (conn->link_mode & HCI_LM_ENCRYPT) | |
334 | return 1; | |
335 | ||
336 | if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &conn->pend)) | |
337 | return 0; | |
338 | ||
339 | if (hci_conn_auth(conn)) { | |
340 | struct hci_cp_set_conn_encrypt cp; | |
341 | cp.handle = __cpu_to_le16(conn->handle); | |
342 | cp.encrypt = 1; | |
343 | hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_SET_CONN_ENCRYPT, sizeof(cp), &cp); | |
344 | } | |
345 | return 0; | |
346 | } | |
347 | EXPORT_SYMBOL(hci_conn_encrypt); | |
348 | ||
349 | /* Change link key */ | |
350 | int hci_conn_change_link_key(struct hci_conn *conn) | |
351 | { | |
352 | BT_DBG("conn %p", conn); | |
353 | ||
354 | if (!test_and_set_bit(HCI_CONN_AUTH_PEND, &conn->pend)) { | |
355 | struct hci_cp_change_conn_link_key cp; | |
356 | cp.handle = __cpu_to_le16(conn->handle); | |
357 | hci_send_cmd(conn->hdev, OGF_LINK_CTL, OCF_CHANGE_CONN_LINK_KEY, sizeof(cp), &cp); | |
358 | } | |
359 | return 0; | |
360 | } | |
361 | EXPORT_SYMBOL(hci_conn_change_link_key); | |
362 | ||
363 | /* Switch role */ | |
364 | int hci_conn_switch_role(struct hci_conn *conn, uint8_t role) | |
365 | { | |
366 | BT_DBG("conn %p", conn); | |
367 | ||
368 | if (!role && conn->link_mode & HCI_LM_MASTER) | |
369 | return 1; | |
370 | ||
371 | if (!test_and_set_bit(HCI_CONN_RSWITCH_PEND, &conn->pend)) { | |
372 | struct hci_cp_switch_role cp; | |
373 | bacpy(&cp.bdaddr, &conn->dst); | |
374 | cp.role = role; | |
375 | hci_send_cmd(conn->hdev, OGF_LINK_POLICY, OCF_SWITCH_ROLE, sizeof(cp), &cp); | |
376 | } | |
377 | return 0; | |
378 | } | |
379 | EXPORT_SYMBOL(hci_conn_switch_role); | |
380 | ||
04837f64 MH |
381 | /* Enter active mode */ |
382 | void hci_conn_enter_active_mode(struct hci_conn *conn) | |
383 | { | |
384 | struct hci_dev *hdev = conn->hdev; | |
385 | ||
386 | BT_DBG("conn %p mode %d", conn, conn->mode); | |
387 | ||
388 | if (test_bit(HCI_RAW, &hdev->flags)) | |
389 | return; | |
390 | ||
391 | if (conn->mode != HCI_CM_SNIFF || !conn->power_save) | |
392 | goto timer; | |
393 | ||
394 | if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) { | |
395 | struct hci_cp_exit_sniff_mode cp; | |
396 | cp.handle = __cpu_to_le16(conn->handle); | |
397 | hci_send_cmd(hdev, OGF_LINK_POLICY, | |
398 | OCF_EXIT_SNIFF_MODE, sizeof(cp), &cp); | |
399 | } | |
400 | ||
401 | timer: | |
402 | if (hdev->idle_timeout > 0) | |
403 | mod_timer(&conn->idle_timer, | |
404 | jiffies + msecs_to_jiffies(hdev->idle_timeout)); | |
405 | } | |
406 | ||
407 | /* Enter sniff mode */ | |
408 | void hci_conn_enter_sniff_mode(struct hci_conn *conn) | |
409 | { | |
410 | struct hci_dev *hdev = conn->hdev; | |
411 | ||
412 | BT_DBG("conn %p mode %d", conn, conn->mode); | |
413 | ||
414 | if (test_bit(HCI_RAW, &hdev->flags)) | |
415 | return; | |
416 | ||
417 | if (!lmp_sniff_capable(hdev) || !lmp_sniff_capable(conn)) | |
418 | return; | |
419 | ||
420 | if (conn->mode != HCI_CM_ACTIVE || !(conn->link_policy & HCI_LP_SNIFF)) | |
421 | return; | |
422 | ||
423 | if (lmp_sniffsubr_capable(hdev) && lmp_sniffsubr_capable(conn)) { | |
424 | struct hci_cp_sniff_subrate cp; | |
425 | cp.handle = __cpu_to_le16(conn->handle); | |
426 | cp.max_latency = __constant_cpu_to_le16(0); | |
427 | cp.min_remote_timeout = __constant_cpu_to_le16(0); | |
428 | cp.min_local_timeout = __constant_cpu_to_le16(0); | |
429 | hci_send_cmd(hdev, OGF_LINK_POLICY, | |
430 | OCF_SNIFF_SUBRATE, sizeof(cp), &cp); | |
431 | } | |
432 | ||
433 | if (!test_and_set_bit(HCI_CONN_MODE_CHANGE_PEND, &conn->pend)) { | |
434 | struct hci_cp_sniff_mode cp; | |
435 | cp.handle = __cpu_to_le16(conn->handle); | |
436 | cp.max_interval = __cpu_to_le16(hdev->sniff_max_interval); | |
437 | cp.min_interval = __cpu_to_le16(hdev->sniff_min_interval); | |
438 | cp.attempt = __constant_cpu_to_le16(4); | |
439 | cp.timeout = __constant_cpu_to_le16(1); | |
440 | hci_send_cmd(hdev, OGF_LINK_POLICY, | |
441 | OCF_SNIFF_MODE, sizeof(cp), &cp); | |
442 | } | |
443 | } | |
444 | ||
1da177e4 LT |
445 | /* Drop all connection on the device */ |
446 | void hci_conn_hash_flush(struct hci_dev *hdev) | |
447 | { | |
448 | struct hci_conn_hash *h = &hdev->conn_hash; | |
449 | struct list_head *p; | |
450 | ||
451 | BT_DBG("hdev %s", hdev->name); | |
452 | ||
453 | p = h->list.next; | |
454 | while (p != &h->list) { | |
455 | struct hci_conn *c; | |
456 | ||
457 | c = list_entry(p, struct hci_conn, list); | |
458 | p = p->next; | |
459 | ||
460 | c->state = BT_CLOSED; | |
461 | ||
462 | hci_proto_disconn_ind(c, 0x16); | |
463 | hci_conn_del(c); | |
464 | } | |
465 | } | |
466 | ||
467 | int hci_get_conn_list(void __user *arg) | |
468 | { | |
469 | struct hci_conn_list_req req, *cl; | |
470 | struct hci_conn_info *ci; | |
471 | struct hci_dev *hdev; | |
472 | struct list_head *p; | |
473 | int n = 0, size, err; | |
474 | ||
475 | if (copy_from_user(&req, arg, sizeof(req))) | |
476 | return -EFAULT; | |
477 | ||
478 | if (!req.conn_num || req.conn_num > (PAGE_SIZE * 2) / sizeof(*ci)) | |
479 | return -EINVAL; | |
480 | ||
481 | size = sizeof(req) + req.conn_num * sizeof(*ci); | |
482 | ||
12fe2c58 | 483 | if (!(cl = kmalloc(size, GFP_KERNEL))) |
1da177e4 LT |
484 | return -ENOMEM; |
485 | ||
486 | if (!(hdev = hci_dev_get(req.dev_id))) { | |
487 | kfree(cl); | |
488 | return -ENODEV; | |
489 | } | |
490 | ||
491 | ci = cl->conn_info; | |
492 | ||
493 | hci_dev_lock_bh(hdev); | |
494 | list_for_each(p, &hdev->conn_hash.list) { | |
495 | register struct hci_conn *c; | |
496 | c = list_entry(p, struct hci_conn, list); | |
497 | ||
498 | bacpy(&(ci + n)->bdaddr, &c->dst); | |
499 | (ci + n)->handle = c->handle; | |
500 | (ci + n)->type = c->type; | |
501 | (ci + n)->out = c->out; | |
502 | (ci + n)->state = c->state; | |
503 | (ci + n)->link_mode = c->link_mode; | |
504 | if (++n >= req.conn_num) | |
505 | break; | |
506 | } | |
507 | hci_dev_unlock_bh(hdev); | |
508 | ||
509 | cl->dev_id = hdev->id; | |
510 | cl->conn_num = n; | |
511 | size = sizeof(req) + n * sizeof(*ci); | |
512 | ||
513 | hci_dev_put(hdev); | |
514 | ||
515 | err = copy_to_user(arg, cl, size); | |
516 | kfree(cl); | |
517 | ||
518 | return err ? -EFAULT : 0; | |
519 | } | |
520 | ||
521 | int hci_get_conn_info(struct hci_dev *hdev, void __user *arg) | |
522 | { | |
523 | struct hci_conn_info_req req; | |
524 | struct hci_conn_info ci; | |
525 | struct hci_conn *conn; | |
526 | char __user *ptr = arg + sizeof(req); | |
527 | ||
528 | if (copy_from_user(&req, arg, sizeof(req))) | |
529 | return -EFAULT; | |
530 | ||
531 | hci_dev_lock_bh(hdev); | |
532 | conn = hci_conn_hash_lookup_ba(hdev, req.type, &req.bdaddr); | |
533 | if (conn) { | |
534 | bacpy(&ci.bdaddr, &conn->dst); | |
535 | ci.handle = conn->handle; | |
536 | ci.type = conn->type; | |
537 | ci.out = conn->out; | |
538 | ci.state = conn->state; | |
539 | ci.link_mode = conn->link_mode; | |
540 | } | |
541 | hci_dev_unlock_bh(hdev); | |
542 | ||
543 | if (!conn) | |
544 | return -ENOENT; | |
545 | ||
546 | return copy_to_user(ptr, &ci, sizeof(ci)) ? -EFAULT : 0; | |
547 | } |