1 /*
2 * Wireless USB Host Controller
3 * Security support: encryption enablement, etc
4 *
5 * Copyright (C) 2006 Intel Corporation
6 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License version
10 * 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 * 02110-1301, USA.
21 *
22 *
23 * FIXME: docs
24 */
25 #include <linux/types.h>
26 #include <linux/slab.h>
27 #include <linux/usb/ch9.h>
28 #include <linux/random.h>
29 #include <linux/export.h>
30 #include "wusbhc.h"
31
32 static void wusbhc_set_gtk_callback(struct urb *urb);
33 static void wusbhc_gtk_rekey_done_work(struct work_struct *work);
34
wusbhc_sec_create(struct wusbhc * wusbhc)35 int wusbhc_sec_create(struct wusbhc *wusbhc)
36 {
37 wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + sizeof(wusbhc->gtk.data);
38 wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY;
39 wusbhc->gtk.descr.bReserved = 0;
40
41 wusbhc->gtk_index = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_GTK,
42 WUSB_KEY_INDEX_ORIGINATOR_HOST);
43
44 INIT_WORK(&wusbhc->gtk_rekey_done_work, wusbhc_gtk_rekey_done_work);
45
46 return 0;
47 }
48
49
50 /* Called when the HC is destroyed */
wusbhc_sec_destroy(struct wusbhc * wusbhc)51 void wusbhc_sec_destroy(struct wusbhc *wusbhc)
52 {
53 }
54
55
56 /**
57 * wusbhc_next_tkid - generate a new, currently unused, TKID
58 * @wusbhc: the WUSB host controller
59 * @wusb_dev: the device whose PTK the TKID is for
60 * (or NULL for a TKID for a GTK)
61 *
62 * The generated TKID consist of two parts: the device's authenicated
63 * address (or 0 or a GTK); and an incrementing number. This ensures
64 * that TKIDs cannot be shared between devices and by the time the
65 * incrementing number wraps around the older TKIDs will no longer be
66 * in use (a maximum of two keys may be active at any one time).
67 */
wusbhc_next_tkid(struct wusbhc * wusbhc,struct wusb_dev * wusb_dev)68 static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
69 {
70 u32 *tkid;
71 u32 addr;
72
73 if (wusb_dev == NULL) {
74 tkid = &wusbhc->gtk_tkid;
75 addr = 0;
76 } else {
77 tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid;
78 addr = wusb_dev->addr & 0x7f;
79 }
80
81 *tkid = (addr << 8) | ((*tkid + 1) & 0xff);
82
83 return *tkid;
84 }
85
wusbhc_generate_gtk(struct wusbhc * wusbhc)86 static void wusbhc_generate_gtk(struct wusbhc *wusbhc)
87 {
88 const size_t key_size = sizeof(wusbhc->gtk.data);
89 u32 tkid;
90
91 tkid = wusbhc_next_tkid(wusbhc, NULL);
92
93 wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff;
94 wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff;
95 wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff;
96
97 get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size);
98 }
99
100 /**
101 * wusbhc_sec_start - start the security management process
102 * @wusbhc: the WUSB host controller
103 *
104 * Generate and set an initial GTK on the host controller.
105 *
106 * Called when the HC is started.
107 */
wusbhc_sec_start(struct wusbhc * wusbhc)108 int wusbhc_sec_start(struct wusbhc *wusbhc)
109 {
110 const size_t key_size = sizeof(wusbhc->gtk.data);
111 int result;
112
113 wusbhc_generate_gtk(wusbhc);
114
115 result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid,
116 &wusbhc->gtk.descr.bKeyData, key_size);
117 if (result < 0)
118 dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n",
119 result);
120
121 return result;
122 }
123
124 /**
125 * wusbhc_sec_stop - stop the security management process
126 * @wusbhc: the WUSB host controller
127 *
128 * Wait for any pending GTK rekeys to stop.
129 */
wusbhc_sec_stop(struct wusbhc * wusbhc)130 void wusbhc_sec_stop(struct wusbhc *wusbhc)
131 {
132 cancel_work_sync(&wusbhc->gtk_rekey_done_work);
133 }
134
135
136 /** @returns encryption type name */
wusb_et_name(u8 x)137 const char *wusb_et_name(u8 x)
138 {
139 switch (x) {
140 case USB_ENC_TYPE_UNSECURE: return "unsecure";
141 case USB_ENC_TYPE_WIRED: return "wired";
142 case USB_ENC_TYPE_CCM_1: return "CCM-1";
143 case USB_ENC_TYPE_RSA_1: return "RSA-1";
144 default: return "unknown";
145 }
146 }
147 EXPORT_SYMBOL_GPL(wusb_et_name);
148
149 /*
150 * Set the device encryption method
151 *
152 * We tell the device which encryption method to use; we do this when
153 * setting up the device's security.
154 */
wusb_dev_set_encryption(struct usb_device * usb_dev,int value)155 static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value)
156 {
157 int result;
158 struct device *dev = &usb_dev->dev;
159 struct wusb_dev *wusb_dev = usb_dev->wusb_dev;
160
161 if (value) {
162 value = wusb_dev->ccm1_etd.bEncryptionValue;
163 } else {
164 /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */
165 value = 0;
166 }
167 /* Set device's */
168 result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
169 USB_REQ_SET_ENCRYPTION,
170 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
171 value, 0, NULL, 0, 1000 /* FIXME: arbitrary */);
172 if (result < 0)
173 dev_err(dev, "Can't set device's WUSB encryption to "
174 "%s (value %d): %d\n",
175 wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType),
176 wusb_dev->ccm1_etd.bEncryptionValue, result);
177 return result;
178 }
179
180 /*
181 * Set the GTK to be used by a device.
182 *
183 * The device must be authenticated.
184 */
wusb_dev_set_gtk(struct wusbhc * wusbhc,struct wusb_dev * wusb_dev)185 static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
186 {
187 struct usb_device *usb_dev = wusb_dev->usb_dev;
188
189 return usb_control_msg(
190 usb_dev, usb_sndctrlpipe(usb_dev, 0),
191 USB_REQ_SET_DESCRIPTOR,
192 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
193 USB_DT_KEY << 8 | wusbhc->gtk_index, 0,
194 &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
195 1000);
196 }
197
198
199 /* FIXME: prototype for adding security */
wusb_dev_sec_add(struct wusbhc * wusbhc,struct usb_device * usb_dev,struct wusb_dev * wusb_dev)200 int wusb_dev_sec_add(struct wusbhc *wusbhc,
201 struct usb_device *usb_dev, struct wusb_dev *wusb_dev)
202 {
203 int result, bytes, secd_size;
204 struct device *dev = &usb_dev->dev;
205 struct usb_security_descriptor *secd, *new_secd;
206 const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL;
207 const void *itr, *top;
208 char buf[64];
209
210 secd = kmalloc(sizeof(*secd), GFP_KERNEL);
211 if (secd == NULL) {
212 result = -ENOMEM;
213 goto out;
214 }
215
216 result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
217 0, secd, sizeof(*secd));
218 if (result < sizeof(*secd)) {
219 dev_err(dev, "Can't read security descriptor or "
220 "not enough data: %d\n", result);
221 goto out;
222 }
223 secd_size = le16_to_cpu(secd->wTotalLength);
224 new_secd = krealloc(secd, secd_size, GFP_KERNEL);
225 if (new_secd == NULL) {
226 dev_err(dev, "Can't allocate space for security descriptors\n");
227 goto out;
228 }
229 secd = new_secd;
230 result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
231 0, secd, secd_size);
232 if (result < secd_size) {
233 dev_err(dev, "Can't read security descriptor or "
234 "not enough data: %d\n", result);
235 goto out;
236 }
237 bytes = 0;
238 itr = &secd[1];
239 top = (void *)secd + result;
240 while (itr < top) {
241 etd = itr;
242 if (top - itr < sizeof(*etd)) {
243 dev_err(dev, "BUG: bad device security descriptor; "
244 "not enough data (%zu vs %zu bytes left)\n",
245 top - itr, sizeof(*etd));
246 break;
247 }
248 if (etd->bLength < sizeof(*etd)) {
249 dev_err(dev, "BUG: bad device encryption descriptor; "
250 "descriptor is too short "
251 "(%u vs %zu needed)\n",
252 etd->bLength, sizeof(*etd));
253 break;
254 }
255 itr += etd->bLength;
256 bytes += snprintf(buf + bytes, sizeof(buf) - bytes,
257 "%s (0x%02x/%02x) ",
258 wusb_et_name(etd->bEncryptionType),
259 etd->bEncryptionValue, etd->bAuthKeyIndex);
260 if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1)
261 ccm1_etd = etd;
262 }
263 /* This code only supports CCM1 as of now. */
264 /* FIXME: user has to choose which sec mode to use?
265 * In theory we want CCM */
266 if (ccm1_etd == NULL) {
267 dev_err(dev, "WUSB device doesn't support CCM1 encryption, "
268 "can't use!\n");
269 result = -EINVAL;
270 goto out;
271 }
272 wusb_dev->ccm1_etd = *ccm1_etd;
273 dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n",
274 buf, wusb_et_name(ccm1_etd->bEncryptionType),
275 ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex);
276 result = 0;
277 out:
278 kfree(secd);
279 return result;
280 }
281
wusb_dev_sec_rm(struct wusb_dev * wusb_dev)282 void wusb_dev_sec_rm(struct wusb_dev *wusb_dev)
283 {
284 /* Nothing so far */
285 }
286
287 /**
288 * Update the address of an unauthenticated WUSB device
289 *
290 * Once we have successfully authenticated, we take it to addr0 state
291 * and then to a normal address.
292 *
293 * Before the device's address (as known by it) was usb_dev->devnum |
294 * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum.
295 */
wusb_dev_update_address(struct wusbhc * wusbhc,struct wusb_dev * wusb_dev)296 int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
297 {
298 int result = -ENOMEM;
299 struct usb_device *usb_dev = wusb_dev->usb_dev;
300 struct device *dev = &usb_dev->dev;
301 u8 new_address = wusb_dev->addr & 0x7F;
302
303 /* Set address 0 */
304 result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
305 USB_REQ_SET_ADDRESS, 0,
306 0, 0, NULL, 0, 1000 /* FIXME: arbitrary */);
307 if (result < 0) {
308 dev_err(dev, "auth failed: can't set address 0: %d\n",
309 result);
310 goto error_addr0;
311 }
312 result = wusb_set_dev_addr(wusbhc, wusb_dev, 0);
313 if (result < 0)
314 goto error_addr0;
315 usb_set_device_state(usb_dev, USB_STATE_DEFAULT);
316 usb_ep0_reinit(usb_dev);
317
318 /* Set new (authenticated) address. */
319 result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
320 USB_REQ_SET_ADDRESS, 0,
321 new_address, 0, NULL, 0,
322 1000 /* FIXME: arbitrary */);
323 if (result < 0) {
324 dev_err(dev, "auth failed: can't set address %u: %d\n",
325 new_address, result);
326 goto error_addr;
327 }
328 result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address);
329 if (result < 0)
330 goto error_addr;
331 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
332 usb_ep0_reinit(usb_dev);
333 usb_dev->authenticated = 1;
334 error_addr:
335 error_addr0:
336 return result;
337 }
338
339 /*
340 *
341 *
342 */
343 /* FIXME: split and cleanup */
wusb_dev_4way_handshake(struct wusbhc * wusbhc,struct wusb_dev * wusb_dev,struct wusb_ckhdid * ck)344 int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev,
345 struct wusb_ckhdid *ck)
346 {
347 int result = -ENOMEM;
348 struct usb_device *usb_dev = wusb_dev->usb_dev;
349 struct device *dev = &usb_dev->dev;
350 u32 tkid;
351 __le32 tkid_le;
352 struct usb_handshake *hs;
353 struct aes_ccm_nonce ccm_n;
354 u8 mic[8];
355 struct wusb_keydvt_in keydvt_in;
356 struct wusb_keydvt_out keydvt_out;
357
358 hs = kcalloc(3, sizeof(hs[0]), GFP_KERNEL);
359 if (hs == NULL) {
360 dev_err(dev, "can't allocate handshake data\n");
361 goto error_kzalloc;
362 }
363
364 /* We need to turn encryption before beginning the 4way
365 * hshake (WUSB1.0[.3.2.2]) */
366 result = wusb_dev_set_encryption(usb_dev, 1);
367 if (result < 0)
368 goto error_dev_set_encryption;
369
370 tkid = wusbhc_next_tkid(wusbhc, wusb_dev);
371 tkid_le = cpu_to_le32(tkid);
372
373 hs[0].bMessageNumber = 1;
374 hs[0].bStatus = 0;
375 memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID));
376 hs[0].bReserved = 0;
377 memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID));
378 get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce));
379 memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */
380
381 result = usb_control_msg(
382 usb_dev, usb_sndctrlpipe(usb_dev, 0),
383 USB_REQ_SET_HANDSHAKE,
384 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
385 1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */);
386 if (result < 0) {
387 dev_err(dev, "Handshake1: request failed: %d\n", result);
388 goto error_hs1;
389 }
390
391 /* Handshake 2, from the device -- need to verify fields */
392 result = usb_control_msg(
393 usb_dev, usb_rcvctrlpipe(usb_dev, 0),
394 USB_REQ_GET_HANDSHAKE,
395 USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
396 2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */);
397 if (result < 0) {
398 dev_err(dev, "Handshake2: request failed: %d\n", result);
399 goto error_hs2;
400 }
401
402 result = -EINVAL;
403 if (hs[1].bMessageNumber != 2) {
404 dev_err(dev, "Handshake2 failed: bad message number %u\n",
405 hs[1].bMessageNumber);
406 goto error_hs2;
407 }
408 if (hs[1].bStatus != 0) {
409 dev_err(dev, "Handshake2 failed: bad status %u\n",
410 hs[1].bStatus);
411 goto error_hs2;
412 }
413 if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) {
414 dev_err(dev, "Handshake2 failed: TKID mismatch "
415 "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n",
416 hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2],
417 hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]);
418 goto error_hs2;
419 }
420 if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) {
421 dev_err(dev, "Handshake2 failed: CDID mismatch\n");
422 goto error_hs2;
423 }
424
425 /* Setup the CCM nonce */
426 memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */
427 memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid));
428 ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr;
429 ccm_n.dest_addr.data[0] = wusb_dev->addr;
430 ccm_n.dest_addr.data[1] = 0;
431
432 /* Derive the KCK and PTK from CK, the CCM, H and D nonces */
433 memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce));
434 memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce));
435 result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in);
436 if (result < 0) {
437 dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n",
438 result);
439 goto error_hs2;
440 }
441
442 /* Compute MIC and verify it */
443 result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]);
444 if (result < 0) {
445 dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n",
446 result);
447 goto error_hs2;
448 }
449
450 if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) {
451 dev_err(dev, "Handshake2 failed: MIC mismatch\n");
452 goto error_hs2;
453 }
454
455 /* Send Handshake3 */
456 hs[2].bMessageNumber = 3;
457 hs[2].bStatus = 0;
458 memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID));
459 hs[2].bReserved = 0;
460 memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID));
461 memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce));
462 result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]);
463 if (result < 0) {
464 dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n",
465 result);
466 goto error_hs2;
467 }
468
469 result = usb_control_msg(
470 usb_dev, usb_sndctrlpipe(usb_dev, 0),
471 USB_REQ_SET_HANDSHAKE,
472 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
473 3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */);
474 if (result < 0) {
475 dev_err(dev, "Handshake3: request failed: %d\n", result);
476 goto error_hs3;
477 }
478
479 result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid,
480 keydvt_out.ptk, sizeof(keydvt_out.ptk));
481 if (result < 0)
482 goto error_wusbhc_set_ptk;
483
484 result = wusb_dev_set_gtk(wusbhc, wusb_dev);
485 if (result < 0) {
486 dev_err(dev, "Set GTK for device: request failed: %d\n",
487 result);
488 goto error_wusbhc_set_gtk;
489 }
490
491 /* Update the device's address from unauth to auth */
492 if (usb_dev->authenticated == 0) {
493 result = wusb_dev_update_address(wusbhc, wusb_dev);
494 if (result < 0)
495 goto error_dev_update_address;
496 }
497 result = 0;
498 dev_info(dev, "device authenticated\n");
499
500 error_dev_update_address:
501 error_wusbhc_set_gtk:
502 error_wusbhc_set_ptk:
503 error_hs3:
504 error_hs2:
505 error_hs1:
506 memset(hs, 0, 3*sizeof(hs[0]));
507 memset(&keydvt_out, 0, sizeof(keydvt_out));
508 memset(&keydvt_in, 0, sizeof(keydvt_in));
509 memset(&ccm_n, 0, sizeof(ccm_n));
510 memset(mic, 0, sizeof(mic));
511 if (result < 0)
512 wusb_dev_set_encryption(usb_dev, 0);
513 error_dev_set_encryption:
514 kfree(hs);
515 error_kzalloc:
516 return result;
517 }
518
519 /*
520 * Once all connected and authenticated devices have received the new
521 * GTK, switch the host to using it.
522 */
wusbhc_gtk_rekey_done_work(struct work_struct * work)523 static void wusbhc_gtk_rekey_done_work(struct work_struct *work)
524 {
525 struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work);
526 size_t key_size = sizeof(wusbhc->gtk.data);
527
528 mutex_lock(&wusbhc->mutex);
529
530 if (--wusbhc->pending_set_gtks == 0)
531 wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size);
532
533 mutex_unlock(&wusbhc->mutex);
534 }
535
wusbhc_set_gtk_callback(struct urb * urb)536 static void wusbhc_set_gtk_callback(struct urb *urb)
537 {
538 struct wusbhc *wusbhc = urb->context;
539
540 queue_work(wusbd, &wusbhc->gtk_rekey_done_work);
541 }
542
543 /**
544 * wusbhc_gtk_rekey - generate and distribute a new GTK
545 * @wusbhc: the WUSB host controller
546 *
547 * Generate a new GTK and distribute it to all connected and
548 * authenticated devices. When all devices have the new GTK, the host
549 * starts using it.
550 *
551 * This must be called after every device disconnect (see [WUSB]
552 * section 6.2.11.2).
553 */
wusbhc_gtk_rekey(struct wusbhc * wusbhc)554 void wusbhc_gtk_rekey(struct wusbhc *wusbhc)
555 {
556 static const size_t key_size = sizeof(wusbhc->gtk.data);
557 int p;
558
559 wusbhc_generate_gtk(wusbhc);
560
561 for (p = 0; p < wusbhc->ports_max; p++) {
562 struct wusb_dev *wusb_dev;
563
564 wusb_dev = wusbhc->port[p].wusb_dev;
565 if (!wusb_dev || !wusb_dev->usb_dev || !wusb_dev->usb_dev->authenticated)
566 continue;
567
568 usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev,
569 usb_sndctrlpipe(wusb_dev->usb_dev, 0),
570 (void *)wusb_dev->set_gtk_req,
571 &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
572 wusbhc_set_gtk_callback, wusbhc);
573 if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0)
574 wusbhc->pending_set_gtks++;
575 }
576 if (wusbhc->pending_set_gtks == 0)
577 wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size);
578 }
579