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TOMOYO Linux Cross Reference
Linux/net/bluetooth/hidp/core.c

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  1 /*
  2    HIDP implementation for Linux Bluetooth stack (BlueZ).
  3    Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
  4    Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
  5 
  6    This program is free software; you can redistribute it and/or modify
  7    it under the terms of the GNU General Public License version 2 as
  8    published by the Free Software Foundation;
  9 
 10    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 11    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 12    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
 13    IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
 14    CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
 15    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 16    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 17    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 18 
 19    ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
 20    COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
 21    SOFTWARE IS DISCLAIMED.
 22 */
 23 
 24 #include <linux/kref.h>
 25 #include <linux/module.h>
 26 #include <linux/file.h>
 27 #include <linux/kthread.h>
 28 #include <linux/hidraw.h>
 29 
 30 #include <net/bluetooth/bluetooth.h>
 31 #include <net/bluetooth/hci_core.h>
 32 #include <net/bluetooth/l2cap.h>
 33 
 34 #include "hidp.h"
 35 
 36 #define VERSION "1.2"
 37 
 38 static DECLARE_RWSEM(hidp_session_sem);
 39 static DECLARE_WAIT_QUEUE_HEAD(hidp_session_wq);
 40 static LIST_HEAD(hidp_session_list);
 41 
 42 static unsigned char hidp_keycode[256] = {
 43           0,   0,   0,   0,  30,  48,  46,  32,  18,  33,  34,  35,  23,  36,
 44          37,  38,  50,  49,  24,  25,  16,  19,  31,  20,  22,  47,  17,  45,
 45          21,  44,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  28,   1,
 46          14,  15,  57,  12,  13,  26,  27,  43,  43,  39,  40,  41,  51,  52,
 47          53,  58,  59,  60,  61,  62,  63,  64,  65,  66,  67,  68,  87,  88,
 48          99,  70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103,  69,
 49          98,  55,  74,  78,  96,  79,  80,  81,  75,  76,  77,  71,  72,  73,
 50          82,  83,  86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
 51         191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
 52         136, 113, 115, 114,   0,   0,   0, 121,   0,  89,  93, 124,  92,  94,
 53          95,   0,   0,   0, 122, 123,  90,  91,  85,   0,   0,   0,   0,   0,
 54           0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
 55           0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
 56           0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
 57           0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
 58           0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
 59          29,  42,  56, 125,  97,  54, 100, 126, 164, 166, 165, 163, 161, 115,
 60         114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
 61 };
 62 
 63 static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
 64 
 65 static int hidp_session_probe(struct l2cap_conn *conn,
 66                               struct l2cap_user *user);
 67 static void hidp_session_remove(struct l2cap_conn *conn,
 68                                 struct l2cap_user *user);
 69 static int hidp_session_thread(void *arg);
 70 static void hidp_session_terminate(struct hidp_session *s);
 71 
 72 static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
 73 {
 74         u32 valid_flags = 0;
 75         memset(ci, 0, sizeof(*ci));
 76         bacpy(&ci->bdaddr, &session->bdaddr);
 77 
 78         ci->flags = session->flags & valid_flags;
 79         ci->state = BT_CONNECTED;
 80 
 81         if (session->input) {
 82                 ci->vendor  = session->input->id.vendor;
 83                 ci->product = session->input->id.product;
 84                 ci->version = session->input->id.version;
 85                 if (session->input->name)
 86                         strlcpy(ci->name, session->input->name, 128);
 87                 else
 88                         strlcpy(ci->name, "HID Boot Device", 128);
 89         } else if (session->hid) {
 90                 ci->vendor  = session->hid->vendor;
 91                 ci->product = session->hid->product;
 92                 ci->version = session->hid->version;
 93                 strlcpy(ci->name, session->hid->name, 128);
 94         }
 95 }
 96 
 97 /* assemble skb, queue message on @transmit and wake up the session thread */
 98 static int hidp_send_message(struct hidp_session *session, struct socket *sock,
 99                              struct sk_buff_head *transmit, unsigned char hdr,
100                              const unsigned char *data, int size)
101 {
102         struct sk_buff *skb;
103         struct sock *sk = sock->sk;
104 
105         BT_DBG("session %p data %p size %d", session, data, size);
106 
107         if (atomic_read(&session->terminate))
108                 return -EIO;
109 
110         skb = alloc_skb(size + 1, GFP_ATOMIC);
111         if (!skb) {
112                 BT_ERR("Can't allocate memory for new frame");
113                 return -ENOMEM;
114         }
115 
116         skb_put_u8(skb, hdr);
117         if (data && size > 0)
118                 skb_put_data(skb, data, size);
119 
120         skb_queue_tail(transmit, skb);
121         wake_up_interruptible(sk_sleep(sk));
122 
123         return 0;
124 }
125 
126 static int hidp_send_ctrl_message(struct hidp_session *session,
127                                   unsigned char hdr, const unsigned char *data,
128                                   int size)
129 {
130         return hidp_send_message(session, session->ctrl_sock,
131                                  &session->ctrl_transmit, hdr, data, size);
132 }
133 
134 static int hidp_send_intr_message(struct hidp_session *session,
135                                   unsigned char hdr, const unsigned char *data,
136                                   int size)
137 {
138         return hidp_send_message(session, session->intr_sock,
139                                  &session->intr_transmit, hdr, data, size);
140 }
141 
142 static int hidp_input_event(struct input_dev *dev, unsigned int type,
143                             unsigned int code, int value)
144 {
145         struct hidp_session *session = input_get_drvdata(dev);
146         unsigned char newleds;
147         unsigned char hdr, data[2];
148 
149         BT_DBG("session %p type %d code %d value %d",
150                session, type, code, value);
151 
152         if (type != EV_LED)
153                 return -1;
154 
155         newleds = (!!test_bit(LED_KANA,    dev->led) << 3) |
156                   (!!test_bit(LED_COMPOSE, dev->led) << 3) |
157                   (!!test_bit(LED_SCROLLL, dev->led) << 2) |
158                   (!!test_bit(LED_CAPSL,   dev->led) << 1) |
159                   (!!test_bit(LED_NUML,    dev->led) << 0);
160 
161         if (session->leds == newleds)
162                 return 0;
163 
164         session->leds = newleds;
165 
166         hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
167         data[0] = 0x01;
168         data[1] = newleds;
169 
170         return hidp_send_intr_message(session, hdr, data, 2);
171 }
172 
173 static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
174 {
175         struct input_dev *dev = session->input;
176         unsigned char *keys = session->keys;
177         unsigned char *udata = skb->data + 1;
178         signed char *sdata = skb->data + 1;
179         int i, size = skb->len - 1;
180 
181         switch (skb->data[0]) {
182         case 0x01:      /* Keyboard report */
183                 for (i = 0; i < 8; i++)
184                         input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
185 
186                 /* If all the key codes have been set to 0x01, it means
187                  * too many keys were pressed at the same time. */
188                 if (!memcmp(udata + 2, hidp_mkeyspat, 6))
189                         break;
190 
191                 for (i = 2; i < 8; i++) {
192                         if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
193                                 if (hidp_keycode[keys[i]])
194                                         input_report_key(dev, hidp_keycode[keys[i]], 0);
195                                 else
196                                         BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
197                         }
198 
199                         if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
200                                 if (hidp_keycode[udata[i]])
201                                         input_report_key(dev, hidp_keycode[udata[i]], 1);
202                                 else
203                                         BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
204                         }
205                 }
206 
207                 memcpy(keys, udata, 8);
208                 break;
209 
210         case 0x02:      /* Mouse report */
211                 input_report_key(dev, BTN_LEFT,   sdata[0] & 0x01);
212                 input_report_key(dev, BTN_RIGHT,  sdata[0] & 0x02);
213                 input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
214                 input_report_key(dev, BTN_SIDE,   sdata[0] & 0x08);
215                 input_report_key(dev, BTN_EXTRA,  sdata[0] & 0x10);
216 
217                 input_report_rel(dev, REL_X, sdata[1]);
218                 input_report_rel(dev, REL_Y, sdata[2]);
219 
220                 if (size > 3)
221                         input_report_rel(dev, REL_WHEEL, sdata[3]);
222                 break;
223         }
224 
225         input_sync(dev);
226 }
227 
228 static int hidp_get_raw_report(struct hid_device *hid,
229                 unsigned char report_number,
230                 unsigned char *data, size_t count,
231                 unsigned char report_type)
232 {
233         struct hidp_session *session = hid->driver_data;
234         struct sk_buff *skb;
235         size_t len;
236         int numbered_reports = hid->report_enum[report_type].numbered;
237         int ret;
238 
239         if (atomic_read(&session->terminate))
240                 return -EIO;
241 
242         switch (report_type) {
243         case HID_FEATURE_REPORT:
244                 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
245                 break;
246         case HID_INPUT_REPORT:
247                 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
248                 break;
249         case HID_OUTPUT_REPORT:
250                 report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
251                 break;
252         default:
253                 return -EINVAL;
254         }
255 
256         if (mutex_lock_interruptible(&session->report_mutex))
257                 return -ERESTARTSYS;
258 
259         /* Set up our wait, and send the report request to the device. */
260         session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
261         session->waiting_report_number = numbered_reports ? report_number : -1;
262         set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
263         data[0] = report_number;
264         ret = hidp_send_ctrl_message(session, report_type, data, 1);
265         if (ret)
266                 goto err;
267 
268         /* Wait for the return of the report. The returned report
269            gets put in session->report_return.  */
270         while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
271                !atomic_read(&session->terminate)) {
272                 int res;
273 
274                 res = wait_event_interruptible_timeout(session->report_queue,
275                         !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
276                                 || atomic_read(&session->terminate),
277                         5*HZ);
278                 if (res == 0) {
279                         /* timeout */
280                         ret = -EIO;
281                         goto err;
282                 }
283                 if (res < 0) {
284                         /* signal */
285                         ret = -ERESTARTSYS;
286                         goto err;
287                 }
288         }
289 
290         skb = session->report_return;
291         if (skb) {
292                 len = skb->len < count ? skb->len : count;
293                 memcpy(data, skb->data, len);
294 
295                 kfree_skb(skb);
296                 session->report_return = NULL;
297         } else {
298                 /* Device returned a HANDSHAKE, indicating  protocol error. */
299                 len = -EIO;
300         }
301 
302         clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
303         mutex_unlock(&session->report_mutex);
304 
305         return len;
306 
307 err:
308         clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
309         mutex_unlock(&session->report_mutex);
310         return ret;
311 }
312 
313 static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
314                                unsigned char *data, size_t count,
315                                unsigned char report_type)
316 {
317         struct hidp_session *session = hid->driver_data;
318         int ret;
319 
320         switch (report_type) {
321         case HID_FEATURE_REPORT:
322                 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
323                 break;
324         case HID_INPUT_REPORT:
325                 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
326                 break;
327         case HID_OUTPUT_REPORT:
328                 report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
329                 break;
330         default:
331                 return -EINVAL;
332         }
333 
334         if (mutex_lock_interruptible(&session->report_mutex))
335                 return -ERESTARTSYS;
336 
337         /* Set up our wait, and send the report request to the device. */
338         data[0] = reportnum;
339         set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
340         ret = hidp_send_ctrl_message(session, report_type, data, count);
341         if (ret)
342                 goto err;
343 
344         /* Wait for the ACK from the device. */
345         while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
346                !atomic_read(&session->terminate)) {
347                 int res;
348 
349                 res = wait_event_interruptible_timeout(session->report_queue,
350                         !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
351                                 || atomic_read(&session->terminate),
352                         10*HZ);
353                 if (res == 0) {
354                         /* timeout */
355                         ret = -EIO;
356                         goto err;
357                 }
358                 if (res < 0) {
359                         /* signal */
360                         ret = -ERESTARTSYS;
361                         goto err;
362                 }
363         }
364 
365         if (!session->output_report_success) {
366                 ret = -EIO;
367                 goto err;
368         }
369 
370         ret = count;
371 
372 err:
373         clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
374         mutex_unlock(&session->report_mutex);
375         return ret;
376 }
377 
378 static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
379 {
380         struct hidp_session *session = hid->driver_data;
381 
382         return hidp_send_intr_message(session,
383                                       HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
384                                       data, count);
385 }
386 
387 static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
388                             __u8 *buf, size_t len, unsigned char rtype,
389                             int reqtype)
390 {
391         switch (reqtype) {
392         case HID_REQ_GET_REPORT:
393                 return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
394         case HID_REQ_SET_REPORT:
395                 return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
396         default:
397                 return -EIO;
398         }
399 }
400 
401 static void hidp_idle_timeout(struct timer_list *t)
402 {
403         struct hidp_session *session = from_timer(session, t, timer);
404 
405         /* The HIDP user-space API only contains calls to add and remove
406          * devices. There is no way to forward events of any kind. Therefore,
407          * we have to forcefully disconnect a device on idle-timeouts. This is
408          * unfortunate and weird API design, but it is spec-compliant and
409          * required for backwards-compatibility. Hence, on idle-timeout, we
410          * signal driver-detach events, so poll() will be woken up with an
411          * error-condition on both sockets.
412          */
413 
414         session->intr_sock->sk->sk_err = EUNATCH;
415         session->ctrl_sock->sk->sk_err = EUNATCH;
416         wake_up_interruptible(sk_sleep(session->intr_sock->sk));
417         wake_up_interruptible(sk_sleep(session->ctrl_sock->sk));
418 
419         hidp_session_terminate(session);
420 }
421 
422 static void hidp_set_timer(struct hidp_session *session)
423 {
424         if (session->idle_to > 0)
425                 mod_timer(&session->timer, jiffies + HZ * session->idle_to);
426 }
427 
428 static void hidp_del_timer(struct hidp_session *session)
429 {
430         if (session->idle_to > 0)
431                 del_timer(&session->timer);
432 }
433 
434 static void hidp_process_report(struct hidp_session *session, int type,
435                                 const u8 *data, unsigned int len, int intr)
436 {
437         if (len > HID_MAX_BUFFER_SIZE)
438                 len = HID_MAX_BUFFER_SIZE;
439 
440         memcpy(session->input_buf, data, len);
441         hid_input_report(session->hid, type, session->input_buf, len, intr);
442 }
443 
444 static void hidp_process_handshake(struct hidp_session *session,
445                                         unsigned char param)
446 {
447         BT_DBG("session %p param 0x%02x", session, param);
448         session->output_report_success = 0; /* default condition */
449 
450         switch (param) {
451         case HIDP_HSHK_SUCCESSFUL:
452                 /* FIXME: Call into SET_ GET_ handlers here */
453                 session->output_report_success = 1;
454                 break;
455 
456         case HIDP_HSHK_NOT_READY:
457         case HIDP_HSHK_ERR_INVALID_REPORT_ID:
458         case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
459         case HIDP_HSHK_ERR_INVALID_PARAMETER:
460                 if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
461                         wake_up_interruptible(&session->report_queue);
462 
463                 /* FIXME: Call into SET_ GET_ handlers here */
464                 break;
465 
466         case HIDP_HSHK_ERR_UNKNOWN:
467                 break;
468 
469         case HIDP_HSHK_ERR_FATAL:
470                 /* Device requests a reboot, as this is the only way this error
471                  * can be recovered. */
472                 hidp_send_ctrl_message(session,
473                         HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
474                 break;
475 
476         default:
477                 hidp_send_ctrl_message(session,
478                         HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
479                 break;
480         }
481 
482         /* Wake up the waiting thread. */
483         if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
484                 wake_up_interruptible(&session->report_queue);
485 }
486 
487 static void hidp_process_hid_control(struct hidp_session *session,
488                                         unsigned char param)
489 {
490         BT_DBG("session %p param 0x%02x", session, param);
491 
492         if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
493                 /* Flush the transmit queues */
494                 skb_queue_purge(&session->ctrl_transmit);
495                 skb_queue_purge(&session->intr_transmit);
496 
497                 hidp_session_terminate(session);
498         }
499 }
500 
501 /* Returns true if the passed-in skb should be freed by the caller. */
502 static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
503                                 unsigned char param)
504 {
505         int done_with_skb = 1;
506         BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
507 
508         switch (param) {
509         case HIDP_DATA_RTYPE_INPUT:
510                 hidp_set_timer(session);
511 
512                 if (session->input)
513                         hidp_input_report(session, skb);
514 
515                 if (session->hid)
516                         hidp_process_report(session, HID_INPUT_REPORT,
517                                             skb->data, skb->len, 0);
518                 break;
519 
520         case HIDP_DATA_RTYPE_OTHER:
521         case HIDP_DATA_RTYPE_OUPUT:
522         case HIDP_DATA_RTYPE_FEATURE:
523                 break;
524 
525         default:
526                 hidp_send_ctrl_message(session,
527                         HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
528         }
529 
530         if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
531                                 param == session->waiting_report_type) {
532                 if (session->waiting_report_number < 0 ||
533                     session->waiting_report_number == skb->data[0]) {
534                         /* hidp_get_raw_report() is waiting on this report. */
535                         session->report_return = skb;
536                         done_with_skb = 0;
537                         clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
538                         wake_up_interruptible(&session->report_queue);
539                 }
540         }
541 
542         return done_with_skb;
543 }
544 
545 static void hidp_recv_ctrl_frame(struct hidp_session *session,
546                                         struct sk_buff *skb)
547 {
548         unsigned char hdr, type, param;
549         int free_skb = 1;
550 
551         BT_DBG("session %p skb %p len %d", session, skb, skb->len);
552 
553         hdr = skb->data[0];
554         skb_pull(skb, 1);
555 
556         type = hdr & HIDP_HEADER_TRANS_MASK;
557         param = hdr & HIDP_HEADER_PARAM_MASK;
558 
559         switch (type) {
560         case HIDP_TRANS_HANDSHAKE:
561                 hidp_process_handshake(session, param);
562                 break;
563 
564         case HIDP_TRANS_HID_CONTROL:
565                 hidp_process_hid_control(session, param);
566                 break;
567 
568         case HIDP_TRANS_DATA:
569                 free_skb = hidp_process_data(session, skb, param);
570                 break;
571 
572         default:
573                 hidp_send_ctrl_message(session,
574                         HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
575                 break;
576         }
577 
578         if (free_skb)
579                 kfree_skb(skb);
580 }
581 
582 static void hidp_recv_intr_frame(struct hidp_session *session,
583                                 struct sk_buff *skb)
584 {
585         unsigned char hdr;
586 
587         BT_DBG("session %p skb %p len %d", session, skb, skb->len);
588 
589         hdr = skb->data[0];
590         skb_pull(skb, 1);
591 
592         if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
593                 hidp_set_timer(session);
594 
595                 if (session->input)
596                         hidp_input_report(session, skb);
597 
598                 if (session->hid) {
599                         hidp_process_report(session, HID_INPUT_REPORT,
600                                             skb->data, skb->len, 1);
601                         BT_DBG("report len %d", skb->len);
602                 }
603         } else {
604                 BT_DBG("Unsupported protocol header 0x%02x", hdr);
605         }
606 
607         kfree_skb(skb);
608 }
609 
610 static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
611 {
612         struct kvec iv = { data, len };
613         struct msghdr msg;
614 
615         BT_DBG("sock %p data %p len %d", sock, data, len);
616 
617         if (!len)
618                 return 0;
619 
620         memset(&msg, 0, sizeof(msg));
621 
622         return kernel_sendmsg(sock, &msg, &iv, 1, len);
623 }
624 
625 /* dequeue message from @transmit and send via @sock */
626 static void hidp_process_transmit(struct hidp_session *session,
627                                   struct sk_buff_head *transmit,
628                                   struct socket *sock)
629 {
630         struct sk_buff *skb;
631         int ret;
632 
633         BT_DBG("session %p", session);
634 
635         while ((skb = skb_dequeue(transmit))) {
636                 ret = hidp_send_frame(sock, skb->data, skb->len);
637                 if (ret == -EAGAIN) {
638                         skb_queue_head(transmit, skb);
639                         break;
640                 } else if (ret < 0) {
641                         hidp_session_terminate(session);
642                         kfree_skb(skb);
643                         break;
644                 }
645 
646                 hidp_set_timer(session);
647                 kfree_skb(skb);
648         }
649 }
650 
651 static int hidp_setup_input(struct hidp_session *session,
652                                 const struct hidp_connadd_req *req)
653 {
654         struct input_dev *input;
655         int i;
656 
657         input = input_allocate_device();
658         if (!input)
659                 return -ENOMEM;
660 
661         session->input = input;
662 
663         input_set_drvdata(input, session);
664 
665         input->name = "Bluetooth HID Boot Protocol Device";
666 
667         input->id.bustype = BUS_BLUETOOTH;
668         input->id.vendor  = req->vendor;
669         input->id.product = req->product;
670         input->id.version = req->version;
671 
672         if (req->subclass & 0x40) {
673                 set_bit(EV_KEY, input->evbit);
674                 set_bit(EV_LED, input->evbit);
675                 set_bit(EV_REP, input->evbit);
676 
677                 set_bit(LED_NUML,    input->ledbit);
678                 set_bit(LED_CAPSL,   input->ledbit);
679                 set_bit(LED_SCROLLL, input->ledbit);
680                 set_bit(LED_COMPOSE, input->ledbit);
681                 set_bit(LED_KANA,    input->ledbit);
682 
683                 for (i = 0; i < sizeof(hidp_keycode); i++)
684                         set_bit(hidp_keycode[i], input->keybit);
685                 clear_bit(0, input->keybit);
686         }
687 
688         if (req->subclass & 0x80) {
689                 input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
690                 input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
691                         BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
692                 input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
693                 input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
694                         BIT_MASK(BTN_EXTRA);
695                 input->relbit[0] |= BIT_MASK(REL_WHEEL);
696         }
697 
698         input->dev.parent = &session->conn->hcon->dev;
699 
700         input->event = hidp_input_event;
701 
702         return 0;
703 }
704 
705 static int hidp_open(struct hid_device *hid)
706 {
707         return 0;
708 }
709 
710 static void hidp_close(struct hid_device *hid)
711 {
712 }
713 
714 static int hidp_parse(struct hid_device *hid)
715 {
716         struct hidp_session *session = hid->driver_data;
717 
718         return hid_parse_report(session->hid, session->rd_data,
719                         session->rd_size);
720 }
721 
722 static int hidp_start(struct hid_device *hid)
723 {
724         return 0;
725 }
726 
727 static void hidp_stop(struct hid_device *hid)
728 {
729         struct hidp_session *session = hid->driver_data;
730 
731         skb_queue_purge(&session->ctrl_transmit);
732         skb_queue_purge(&session->intr_transmit);
733 
734         hid->claimed = 0;
735 }
736 
737 struct hid_ll_driver hidp_hid_driver = {
738         .parse = hidp_parse,
739         .start = hidp_start,
740         .stop = hidp_stop,
741         .open  = hidp_open,
742         .close = hidp_close,
743         .raw_request = hidp_raw_request,
744         .output_report = hidp_output_report,
745 };
746 EXPORT_SYMBOL_GPL(hidp_hid_driver);
747 
748 /* This function sets up the hid device. It does not add it
749    to the HID system. That is done in hidp_add_connection(). */
750 static int hidp_setup_hid(struct hidp_session *session,
751                                 const struct hidp_connadd_req *req)
752 {
753         struct hid_device *hid;
754         int err;
755 
756         session->rd_data = memdup_user(req->rd_data, req->rd_size);
757         if (IS_ERR(session->rd_data))
758                 return PTR_ERR(session->rd_data);
759 
760         session->rd_size = req->rd_size;
761 
762         hid = hid_allocate_device();
763         if (IS_ERR(hid)) {
764                 err = PTR_ERR(hid);
765                 goto fault;
766         }
767 
768         session->hid = hid;
769 
770         hid->driver_data = session;
771 
772         hid->bus     = BUS_BLUETOOTH;
773         hid->vendor  = req->vendor;
774         hid->product = req->product;
775         hid->version = req->version;
776         hid->country = req->country;
777 
778         strncpy(hid->name, req->name, sizeof(hid->name));
779 
780         snprintf(hid->phys, sizeof(hid->phys), "%pMR",
781                  &l2cap_pi(session->ctrl_sock->sk)->chan->src);
782 
783         /* NOTE: Some device modules depend on the dst address being stored in
784          * uniq. Please be aware of this before making changes to this behavior.
785          */
786         snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
787                  &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
788 
789         hid->dev.parent = &session->conn->hcon->dev;
790         hid->ll_driver = &hidp_hid_driver;
791 
792         /* True if device is blacklisted in drivers/hid/hid-quirks.c */
793         if (hid_ignore(hid)) {
794                 hid_destroy_device(session->hid);
795                 session->hid = NULL;
796                 return -ENODEV;
797         }
798 
799         return 0;
800 
801 fault:
802         kfree(session->rd_data);
803         session->rd_data = NULL;
804 
805         return err;
806 }
807 
808 /* initialize session devices */
809 static int hidp_session_dev_init(struct hidp_session *session,
810                                  const struct hidp_connadd_req *req)
811 {
812         int ret;
813 
814         if (req->rd_size > 0) {
815                 ret = hidp_setup_hid(session, req);
816                 if (ret && ret != -ENODEV)
817                         return ret;
818         }
819 
820         if (!session->hid) {
821                 ret = hidp_setup_input(session, req);
822                 if (ret < 0)
823                         return ret;
824         }
825 
826         return 0;
827 }
828 
829 /* destroy session devices */
830 static void hidp_session_dev_destroy(struct hidp_session *session)
831 {
832         if (session->hid)
833                 put_device(&session->hid->dev);
834         else if (session->input)
835                 input_put_device(session->input);
836 
837         kfree(session->rd_data);
838         session->rd_data = NULL;
839 }
840 
841 /* add HID/input devices to their underlying bus systems */
842 static int hidp_session_dev_add(struct hidp_session *session)
843 {
844         int ret;
845 
846         /* Both HID and input systems drop a ref-count when unregistering the
847          * device but they don't take a ref-count when registering them. Work
848          * around this by explicitly taking a refcount during registration
849          * which is dropped automatically by unregistering the devices. */
850 
851         if (session->hid) {
852                 ret = hid_add_device(session->hid);
853                 if (ret)
854                         return ret;
855                 get_device(&session->hid->dev);
856         } else if (session->input) {
857                 ret = input_register_device(session->input);
858                 if (ret)
859                         return ret;
860                 input_get_device(session->input);
861         }
862 
863         return 0;
864 }
865 
866 /* remove HID/input devices from their bus systems */
867 static void hidp_session_dev_del(struct hidp_session *session)
868 {
869         if (session->hid)
870                 hid_destroy_device(session->hid);
871         else if (session->input)
872                 input_unregister_device(session->input);
873 }
874 
875 /*
876  * Asynchronous device registration
877  * HID device drivers might want to perform I/O during initialization to
878  * detect device types. Therefore, call device registration in a separate
879  * worker so the HIDP thread can schedule I/O operations.
880  * Note that this must be called after the worker thread was initialized
881  * successfully. This will then add the devices and increase session state
882  * on success, otherwise it will terminate the session thread.
883  */
884 static void hidp_session_dev_work(struct work_struct *work)
885 {
886         struct hidp_session *session = container_of(work,
887                                                     struct hidp_session,
888                                                     dev_init);
889         int ret;
890 
891         ret = hidp_session_dev_add(session);
892         if (!ret)
893                 atomic_inc(&session->state);
894         else
895                 hidp_session_terminate(session);
896 }
897 
898 /*
899  * Create new session object
900  * Allocate session object, initialize static fields, copy input data into the
901  * object and take a reference to all sub-objects.
902  * This returns 0 on success and puts a pointer to the new session object in
903  * \out. Otherwise, an error code is returned.
904  * The new session object has an initial ref-count of 1.
905  */
906 static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
907                             struct socket *ctrl_sock,
908                             struct socket *intr_sock,
909                             const struct hidp_connadd_req *req,
910                             struct l2cap_conn *conn)
911 {
912         struct hidp_session *session;
913         int ret;
914         struct bt_sock *ctrl, *intr;
915 
916         ctrl = bt_sk(ctrl_sock->sk);
917         intr = bt_sk(intr_sock->sk);
918 
919         session = kzalloc(sizeof(*session), GFP_KERNEL);
920         if (!session)
921                 return -ENOMEM;
922 
923         /* object and runtime management */
924         kref_init(&session->ref);
925         atomic_set(&session->state, HIDP_SESSION_IDLING);
926         init_waitqueue_head(&session->state_queue);
927         session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
928 
929         /* connection management */
930         bacpy(&session->bdaddr, bdaddr);
931         session->conn = l2cap_conn_get(conn);
932         session->user.probe = hidp_session_probe;
933         session->user.remove = hidp_session_remove;
934         INIT_LIST_HEAD(&session->user.list);
935         session->ctrl_sock = ctrl_sock;
936         session->intr_sock = intr_sock;
937         skb_queue_head_init(&session->ctrl_transmit);
938         skb_queue_head_init(&session->intr_transmit);
939         session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
940                                         l2cap_pi(ctrl)->chan->imtu);
941         session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
942                                         l2cap_pi(intr)->chan->imtu);
943         session->idle_to = req->idle_to;
944 
945         /* device management */
946         INIT_WORK(&session->dev_init, hidp_session_dev_work);
947         timer_setup(&session->timer, hidp_idle_timeout, 0);
948 
949         /* session data */
950         mutex_init(&session->report_mutex);
951         init_waitqueue_head(&session->report_queue);
952 
953         ret = hidp_session_dev_init(session, req);
954         if (ret)
955                 goto err_free;
956 
957         get_file(session->intr_sock->file);
958         get_file(session->ctrl_sock->file);
959         *out = session;
960         return 0;
961 
962 err_free:
963         l2cap_conn_put(session->conn);
964         kfree(session);
965         return ret;
966 }
967 
968 /* increase ref-count of the given session by one */
969 static void hidp_session_get(struct hidp_session *session)
970 {
971         kref_get(&session->ref);
972 }
973 
974 /* release callback */
975 static void session_free(struct kref *ref)
976 {
977         struct hidp_session *session = container_of(ref, struct hidp_session,
978                                                     ref);
979 
980         hidp_session_dev_destroy(session);
981         skb_queue_purge(&session->ctrl_transmit);
982         skb_queue_purge(&session->intr_transmit);
983         fput(session->intr_sock->file);
984         fput(session->ctrl_sock->file);
985         l2cap_conn_put(session->conn);
986         kfree(session);
987 }
988 
989 /* decrease ref-count of the given session by one */
990 static void hidp_session_put(struct hidp_session *session)
991 {
992         kref_put(&session->ref, session_free);
993 }
994 
995 /*
996  * Search the list of active sessions for a session with target address
997  * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
998  * you do not release this lock, the session objects cannot vanish and you can
999  * safely take a reference to the session yourself.
1000  */
1001 static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1002 {
1003         struct hidp_session *session;
1004 
1005         list_for_each_entry(session, &hidp_session_list, list) {
1006                 if (!bacmp(bdaddr, &session->bdaddr))
1007                         return session;
1008         }
1009 
1010         return NULL;
1011 }
1012 
1013 /*
1014  * Same as __hidp_session_find() but no locks must be held. This also takes a
1015  * reference of the returned session (if non-NULL) so you must drop this
1016  * reference if you no longer use the object.
1017  */
1018 static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1019 {
1020         struct hidp_session *session;
1021 
1022         down_read(&hidp_session_sem);
1023 
1024         session = __hidp_session_find(bdaddr);
1025         if (session)
1026                 hidp_session_get(session);
1027 
1028         up_read(&hidp_session_sem);
1029 
1030         return session;
1031 }
1032 
1033 /*
1034  * Start session synchronously
1035  * This starts a session thread and waits until initialization
1036  * is done or returns an error if it couldn't be started.
1037  * If this returns 0 the session thread is up and running. You must call
1038  * hipd_session_stop_sync() before deleting any runtime resources.
1039  */
1040 static int hidp_session_start_sync(struct hidp_session *session)
1041 {
1042         unsigned int vendor, product;
1043 
1044         if (session->hid) {
1045                 vendor  = session->hid->vendor;
1046                 product = session->hid->product;
1047         } else if (session->input) {
1048                 vendor  = session->input->id.vendor;
1049                 product = session->input->id.product;
1050         } else {
1051                 vendor = 0x0000;
1052                 product = 0x0000;
1053         }
1054 
1055         session->task = kthread_run(hidp_session_thread, session,
1056                                     "khidpd_%04x%04x", vendor, product);
1057         if (IS_ERR(session->task))
1058                 return PTR_ERR(session->task);
1059 
1060         while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1061                 wait_event(session->state_queue,
1062                            atomic_read(&session->state) > HIDP_SESSION_IDLING);
1063 
1064         return 0;
1065 }
1066 
1067 /*
1068  * Terminate session thread
1069  * Wake up session thread and notify it to stop. This is asynchronous and
1070  * returns immediately. Call this whenever a runtime error occurs and you want
1071  * the session to stop.
1072  * Note: wake_up_interruptible() performs any necessary memory-barriers for us.
1073  */
1074 static void hidp_session_terminate(struct hidp_session *session)
1075 {
1076         atomic_inc(&session->terminate);
1077         /*
1078          * See the comment preceding the call to wait_woken()
1079          * in hidp_session_run().
1080          */
1081         wake_up_interruptible(&hidp_session_wq);
1082 }
1083 
1084 /*
1085  * Probe HIDP session
1086  * This is called from the l2cap_conn core when our l2cap_user object is bound
1087  * to the hci-connection. We get the session via the \user object and can now
1088  * start the session thread, link it into the global session list and
1089  * schedule HID/input device registration.
1090  * The global session-list owns its own reference to the session object so you
1091  * can drop your own reference after registering the l2cap_user object.
1092  */
1093 static int hidp_session_probe(struct l2cap_conn *conn,
1094                               struct l2cap_user *user)
1095 {
1096         struct hidp_session *session = container_of(user,
1097                                                     struct hidp_session,
1098                                                     user);
1099         struct hidp_session *s;
1100         int ret;
1101 
1102         down_write(&hidp_session_sem);
1103 
1104         /* check that no other session for this device exists */
1105         s = __hidp_session_find(&session->bdaddr);
1106         if (s) {
1107                 ret = -EEXIST;
1108                 goto out_unlock;
1109         }
1110 
1111         if (session->input) {
1112                 ret = hidp_session_dev_add(session);
1113                 if (ret)
1114                         goto out_unlock;
1115         }
1116 
1117         ret = hidp_session_start_sync(session);
1118         if (ret)
1119                 goto out_del;
1120 
1121         /* HID device registration is async to allow I/O during probe */
1122         if (session->input)
1123                 atomic_inc(&session->state);
1124         else
1125                 schedule_work(&session->dev_init);
1126 
1127         hidp_session_get(session);
1128         list_add(&session->list, &hidp_session_list);
1129         ret = 0;
1130         goto out_unlock;
1131 
1132 out_del:
1133         if (session->input)
1134                 hidp_session_dev_del(session);
1135 out_unlock:
1136         up_write(&hidp_session_sem);
1137         return ret;
1138 }
1139 
1140 /*
1141  * Remove HIDP session
1142  * Called from the l2cap_conn core when either we explicitly unregistered
1143  * the l2cap_user object or if the underlying connection is shut down.
1144  * We signal the hidp-session thread to shut down, unregister the HID/input
1145  * devices and unlink the session from the global list.
1146  * This drops the reference to the session that is owned by the global
1147  * session-list.
1148  * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1149  * This is, because the session-thread might be waiting for an HCI lock that is
1150  * held while we are called. Therefore, we only unregister the devices and
1151  * notify the session-thread to terminate. The thread itself owns a reference
1152  * to the session object so it can safely shut down.
1153  */
1154 static void hidp_session_remove(struct l2cap_conn *conn,
1155                                 struct l2cap_user *user)
1156 {
1157         struct hidp_session *session = container_of(user,
1158                                                     struct hidp_session,
1159                                                     user);
1160 
1161         down_write(&hidp_session_sem);
1162 
1163         hidp_session_terminate(session);
1164 
1165         cancel_work_sync(&session->dev_init);
1166         if (session->input ||
1167             atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1168                 hidp_session_dev_del(session);
1169 
1170         list_del(&session->list);
1171 
1172         up_write(&hidp_session_sem);
1173 
1174         hidp_session_put(session);
1175 }
1176 
1177 /*
1178  * Session Worker
1179  * This performs the actual main-loop of the HIDP worker. We first check
1180  * whether the underlying connection is still alive, then parse all pending
1181  * messages and finally send all outstanding messages.
1182  */
1183 static void hidp_session_run(struct hidp_session *session)
1184 {
1185         struct sock *ctrl_sk = session->ctrl_sock->sk;
1186         struct sock *intr_sk = session->intr_sock->sk;
1187         struct sk_buff *skb;
1188         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1189 
1190         add_wait_queue(&hidp_session_wq, &wait);
1191         for (;;) {
1192                 /*
1193                  * This thread can be woken up two ways:
1194                  *  - You call hidp_session_terminate() which sets the
1195                  *    session->terminate flag and wakes this thread up.
1196                  *  - Via modifying the socket state of ctrl/intr_sock. This
1197                  *    thread is woken up by ->sk_state_changed().
1198                  */
1199 
1200                 if (atomic_read(&session->terminate))
1201                         break;
1202 
1203                 if (ctrl_sk->sk_state != BT_CONNECTED ||
1204                     intr_sk->sk_state != BT_CONNECTED)
1205                         break;
1206 
1207                 /* parse incoming intr-skbs */
1208                 while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1209                         skb_orphan(skb);
1210                         if (!skb_linearize(skb))
1211                                 hidp_recv_intr_frame(session, skb);
1212                         else
1213                                 kfree_skb(skb);
1214                 }
1215 
1216                 /* send pending intr-skbs */
1217                 hidp_process_transmit(session, &session->intr_transmit,
1218                                       session->intr_sock);
1219 
1220                 /* parse incoming ctrl-skbs */
1221                 while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1222                         skb_orphan(skb);
1223                         if (!skb_linearize(skb))
1224                                 hidp_recv_ctrl_frame(session, skb);
1225                         else
1226                                 kfree_skb(skb);
1227                 }
1228 
1229                 /* send pending ctrl-skbs */
1230                 hidp_process_transmit(session, &session->ctrl_transmit,
1231                                       session->ctrl_sock);
1232 
1233                 /*
1234                  * wait_woken() performs the necessary memory barriers
1235                  * for us; see the header comment for this primitive.
1236                  */
1237                 wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
1238         }
1239         remove_wait_queue(&hidp_session_wq, &wait);
1240 
1241         atomic_inc(&session->terminate);
1242 }
1243 
1244 static int hidp_session_wake_function(wait_queue_entry_t *wait,
1245                                       unsigned int mode,
1246                                       int sync, void *key)
1247 {
1248         wake_up_interruptible(&hidp_session_wq);
1249         return false;
1250 }
1251 
1252 /*
1253  * HIDP session thread
1254  * This thread runs the I/O for a single HIDP session. Startup is synchronous
1255  * which allows us to take references to ourself here instead of doing that in
1256  * the caller.
1257  * When we are ready to run we notify the caller and call hidp_session_run().
1258  */
1259 static int hidp_session_thread(void *arg)
1260 {
1261         struct hidp_session *session = arg;
1262         DEFINE_WAIT_FUNC(ctrl_wait, hidp_session_wake_function);
1263         DEFINE_WAIT_FUNC(intr_wait, hidp_session_wake_function);
1264 
1265         BT_DBG("session %p", session);
1266 
1267         /* initialize runtime environment */
1268         hidp_session_get(session);
1269         __module_get(THIS_MODULE);
1270         set_user_nice(current, -15);
1271         hidp_set_timer(session);
1272 
1273         add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1274         add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1275         /* This memory barrier is paired with wq_has_sleeper(). See
1276          * sock_poll_wait() for more information why this is needed. */
1277         smp_mb();
1278 
1279         /* notify synchronous startup that we're ready */
1280         atomic_inc(&session->state);
1281         wake_up(&session->state_queue);
1282 
1283         /* run session */
1284         hidp_session_run(session);
1285 
1286         /* cleanup runtime environment */
1287         remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1288         remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1289         wake_up_interruptible(&session->report_queue);
1290         hidp_del_timer(session);
1291 
1292         /*
1293          * If we stopped ourself due to any internal signal, we should try to
1294          * unregister our own session here to avoid having it linger until the
1295          * parent l2cap_conn dies or user-space cleans it up.
1296          * This does not deadlock as we don't do any synchronous shutdown.
1297          * Instead, this call has the same semantics as if user-space tried to
1298          * delete the session.
1299          */
1300         l2cap_unregister_user(session->conn, &session->user);
1301         hidp_session_put(session);
1302 
1303         module_put_and_exit(0);
1304         return 0;
1305 }
1306 
1307 static int hidp_verify_sockets(struct socket *ctrl_sock,
1308                                struct socket *intr_sock)
1309 {
1310         struct l2cap_chan *ctrl_chan, *intr_chan;
1311         struct bt_sock *ctrl, *intr;
1312         struct hidp_session *session;
1313 
1314         if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1315                 return -EINVAL;
1316 
1317         ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1318         intr_chan = l2cap_pi(intr_sock->sk)->chan;
1319 
1320         if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1321             bacmp(&ctrl_chan->dst, &intr_chan->dst))
1322                 return -ENOTUNIQ;
1323 
1324         ctrl = bt_sk(ctrl_sock->sk);
1325         intr = bt_sk(intr_sock->sk);
1326 
1327         if (ctrl->sk.sk_state != BT_CONNECTED ||
1328             intr->sk.sk_state != BT_CONNECTED)
1329                 return -EBADFD;
1330 
1331         /* early session check, we check again during session registration */
1332         session = hidp_session_find(&ctrl_chan->dst);
1333         if (session) {
1334                 hidp_session_put(session);
1335                 return -EEXIST;
1336         }
1337 
1338         return 0;
1339 }
1340 
1341 int hidp_connection_add(const struct hidp_connadd_req *req,
1342                         struct socket *ctrl_sock,
1343                         struct socket *intr_sock)
1344 {
1345         u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
1346                           BIT(HIDP_BOOT_PROTOCOL_MODE);
1347         struct hidp_session *session;
1348         struct l2cap_conn *conn;
1349         struct l2cap_chan *chan;
1350         int ret;
1351 
1352         ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1353         if (ret)
1354                 return ret;
1355 
1356         if (req->flags & ~valid_flags)
1357                 return -EINVAL;
1358 
1359         chan = l2cap_pi(ctrl_sock->sk)->chan;
1360         conn = NULL;
1361         l2cap_chan_lock(chan);
1362         if (chan->conn)
1363                 conn = l2cap_conn_get(chan->conn);
1364         l2cap_chan_unlock(chan);
1365 
1366         if (!conn)
1367                 return -EBADFD;
1368 
1369         ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1370                                intr_sock, req, conn);
1371         if (ret)
1372                 goto out_conn;
1373 
1374         ret = l2cap_register_user(conn, &session->user);
1375         if (ret)
1376                 goto out_session;
1377 
1378         ret = 0;
1379 
1380 out_session:
1381         hidp_session_put(session);
1382 out_conn:
1383         l2cap_conn_put(conn);
1384         return ret;
1385 }
1386 
1387 int hidp_connection_del(struct hidp_conndel_req *req)
1388 {
1389         u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
1390         struct hidp_session *session;
1391 
1392         if (req->flags & ~valid_flags)
1393                 return -EINVAL;
1394 
1395         session = hidp_session_find(&req->bdaddr);
1396         if (!session)
1397                 return -ENOENT;
1398 
1399         if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
1400                 hidp_send_ctrl_message(session,
1401                                        HIDP_TRANS_HID_CONTROL |
1402                                          HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1403                                        NULL, 0);
1404         else
1405                 l2cap_unregister_user(session->conn, &session->user);
1406 
1407         hidp_session_put(session);
1408 
1409         return 0;
1410 }
1411 
1412 int hidp_get_connlist(struct hidp_connlist_req *req)
1413 {
1414         struct hidp_session *session;
1415         int err = 0, n = 0;
1416 
1417         BT_DBG("");
1418 
1419         down_read(&hidp_session_sem);
1420 
1421         list_for_each_entry(session, &hidp_session_list, list) {
1422                 struct hidp_conninfo ci;
1423 
1424                 hidp_copy_session(session, &ci);
1425 
1426                 if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1427                         err = -EFAULT;
1428                         break;
1429                 }
1430 
1431                 if (++n >= req->cnum)
1432                         break;
1433 
1434                 req->ci++;
1435         }
1436         req->cnum = n;
1437 
1438         up_read(&hidp_session_sem);
1439         return err;
1440 }
1441 
1442 int hidp_get_conninfo(struct hidp_conninfo *ci)
1443 {
1444         struct hidp_session *session;
1445 
1446         session = hidp_session_find(&ci->bdaddr);
1447         if (session) {
1448                 hidp_copy_session(session, ci);
1449                 hidp_session_put(session);
1450         }
1451 
1452         return session ? 0 : -ENOENT;
1453 }
1454 
1455 static int __init hidp_init(void)
1456 {
1457         BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1458 
1459         return hidp_init_sockets();
1460 }
1461 
1462 static void __exit hidp_exit(void)
1463 {
1464         hidp_cleanup_sockets();
1465 }
1466 
1467 module_init(hidp_init);
1468 module_exit(hidp_exit);
1469 
1470 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1471 MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1472 MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1473 MODULE_VERSION(VERSION);
1474 MODULE_LICENSE("GPL");
1475 MODULE_ALIAS("bt-proto-6");
1476 

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