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Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +01001/*
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/usb/ch9.h>
27#include <linux/random.h>
28#include "wusbhc.h"
29
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +010030static void wusbhc_set_gtk_callback(struct urb *urb);
31static void wusbhc_gtk_rekey_done_work(struct work_struct *work);
32
33int wusbhc_sec_create(struct wusbhc *wusbhc)
34{
35 wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + sizeof(wusbhc->gtk.data);
36 wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY;
37 wusbhc->gtk.descr.bReserved = 0;
38
39 wusbhc->gtk_index = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_GTK,
40 WUSB_KEY_INDEX_ORIGINATOR_HOST);
41
42 INIT_WORK(&wusbhc->gtk_rekey_done_work, wusbhc_gtk_rekey_done_work);
43
44 return 0;
45}
46
47
48/* Called when the HC is destroyed */
49void wusbhc_sec_destroy(struct wusbhc *wusbhc)
50{
51}
52
53
54/**
55 * wusbhc_next_tkid - generate a new, currently unused, TKID
56 * @wusbhc: the WUSB host controller
57 * @wusb_dev: the device whose PTK the TKID is for
58 * (or NULL for a TKID for a GTK)
59 *
60 * The generated TKID consist of two parts: the device's authenicated
61 * address (or 0 or a GTK); and an incrementing number. This ensures
62 * that TKIDs cannot be shared between devices and by the time the
63 * incrementing number wraps around the older TKIDs will no longer be
64 * in use (a maximum of two keys may be active at any one time).
65 */
66static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
67{
68 u32 *tkid;
69 u32 addr;
70
71 if (wusb_dev == NULL) {
72 tkid = &wusbhc->gtk_tkid;
73 addr = 0;
74 } else {
75 tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid;
76 addr = wusb_dev->addr & 0x7f;
77 }
78
79 *tkid = (addr << 8) | ((*tkid + 1) & 0xff);
80
81 return *tkid;
82}
83
84static void wusbhc_generate_gtk(struct wusbhc *wusbhc)
85{
86 const size_t key_size = sizeof(wusbhc->gtk.data);
87 u32 tkid;
88
89 tkid = wusbhc_next_tkid(wusbhc, NULL);
90
91 wusbhc->gtk.descr.tTKID[0] = (tkid >> 0) & 0xff;
92 wusbhc->gtk.descr.tTKID[1] = (tkid >> 8) & 0xff;
93 wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff;
94
95 get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size);
96}
97
98/**
99 * wusbhc_sec_start - start the security management process
100 * @wusbhc: the WUSB host controller
101 *
102 * Generate and set an initial GTK on the host controller.
103 *
104 * Called when the HC is started.
105 */
106int wusbhc_sec_start(struct wusbhc *wusbhc)
107{
108 const size_t key_size = sizeof(wusbhc->gtk.data);
109 int result;
110
111 wusbhc_generate_gtk(wusbhc);
112
113 result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid,
114 &wusbhc->gtk.descr.bKeyData, key_size);
115 if (result < 0)
116 dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n",
117 result);
118
119 return result;
120}
121
122/**
123 * wusbhc_sec_stop - stop the security management process
124 * @wusbhc: the WUSB host controller
125 *
126 * Wait for any pending GTK rekeys to stop.
127 */
128void wusbhc_sec_stop(struct wusbhc *wusbhc)
129{
130 cancel_work_sync(&wusbhc->gtk_rekey_done_work);
131}
132
133
134/** @returns encryption type name */
135const char *wusb_et_name(u8 x)
136{
137 switch (x) {
138 case USB_ENC_TYPE_UNSECURE: return "unsecure";
139 case USB_ENC_TYPE_WIRED: return "wired";
140 case USB_ENC_TYPE_CCM_1: return "CCM-1";
141 case USB_ENC_TYPE_RSA_1: return "RSA-1";
142 default: return "unknown";
143 }
144}
145EXPORT_SYMBOL_GPL(wusb_et_name);
146
147/*
148 * Set the device encryption method
149 *
150 * We tell the device which encryption method to use; we do this when
151 * setting up the device's security.
152 */
153static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value)
154{
155 int result;
156 struct device *dev = &usb_dev->dev;
157 struct wusb_dev *wusb_dev = usb_dev->wusb_dev;
158
159 if (value) {
160 value = wusb_dev->ccm1_etd.bEncryptionValue;
161 } else {
162 /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */
163 value = 0;
164 }
165 /* Set device's */
166 result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
167 USB_REQ_SET_ENCRYPTION,
168 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
169 value, 0, NULL, 0, 1000 /* FIXME: arbitrary */);
170 if (result < 0)
171 dev_err(dev, "Can't set device's WUSB encryption to "
172 "%s (value %d): %d\n",
173 wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType),
174 wusb_dev->ccm1_etd.bEncryptionValue, result);
175 return result;
176}
177
178/*
179 * Set the GTK to be used by a device.
180 *
181 * The device must be authenticated.
182 */
183static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
184{
185 struct usb_device *usb_dev = wusb_dev->usb_dev;
186
187 return usb_control_msg(
188 usb_dev, usb_sndctrlpipe(usb_dev, 0),
189 USB_REQ_SET_DESCRIPTOR,
190 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
191 USB_DT_KEY << 8 | wusbhc->gtk_index, 0,
192 &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
193 1000);
194}
195
196
197/* FIXME: prototype for adding security */
198int wusb_dev_sec_add(struct wusbhc *wusbhc,
199 struct usb_device *usb_dev, struct wusb_dev *wusb_dev)
200{
201 int result, bytes, secd_size;
202 struct device *dev = &usb_dev->dev;
203 struct usb_security_descriptor secd;
204 const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL;
205 void *secd_buf;
206 const void *itr, *top;
207 char buf[64];
208
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100209 result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
210 0, &secd, sizeof(secd));
211 if (result < sizeof(secd)) {
212 dev_err(dev, "Can't read security descriptor or "
213 "not enough data: %d\n", result);
214 goto error_secd;
215 }
216 secd_size = le16_to_cpu(secd.wTotalLength);
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100217 secd_buf = kmalloc(secd_size, GFP_KERNEL);
218 if (secd_buf == NULL) {
219 dev_err(dev, "Can't allocate space for security descriptors\n");
220 goto error_secd_alloc;
221 }
222 result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
223 0, secd_buf, secd_size);
224 if (result < secd_size) {
225 dev_err(dev, "Can't read security descriptor or "
226 "not enough data: %d\n", result);
227 goto error_secd_all;
228 }
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100229 bytes = 0;
230 itr = secd_buf + sizeof(secd);
231 top = secd_buf + result;
232 while (itr < top) {
233 etd = itr;
234 if (top - itr < sizeof(*etd)) {
235 dev_err(dev, "BUG: bad device security descriptor; "
236 "not enough data (%zu vs %zu bytes left)\n",
237 top - itr, sizeof(*etd));
238 break;
239 }
240 if (etd->bLength < sizeof(*etd)) {
241 dev_err(dev, "BUG: bad device encryption descriptor; "
242 "descriptor is too short "
243 "(%u vs %zu needed)\n",
244 etd->bLength, sizeof(*etd));
245 break;
246 }
247 itr += etd->bLength;
248 bytes += snprintf(buf + bytes, sizeof(buf) - bytes,
249 "%s (0x%02x/%02x) ",
250 wusb_et_name(etd->bEncryptionType),
251 etd->bEncryptionValue, etd->bAuthKeyIndex);
252 if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1)
253 ccm1_etd = etd;
254 }
255 /* This code only supports CCM1 as of now. */
256 /* FIXME: user has to choose which sec mode to use?
257 * In theory we want CCM */
258 if (ccm1_etd == NULL) {
259 dev_err(dev, "WUSB device doesn't support CCM1 encryption, "
260 "can't use!\n");
261 result = -EINVAL;
262 goto error_no_ccm1;
263 }
264 wusb_dev->ccm1_etd = *ccm1_etd;
David Vrabelbce83692008-12-22 18:22:50 +0000265 dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n",
266 buf, wusb_et_name(ccm1_etd->bEncryptionType),
267 ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex);
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100268 result = 0;
269 kfree(secd_buf);
270out:
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100271 return result;
272
273
274error_no_ccm1:
275error_secd_all:
276 kfree(secd_buf);
277error_secd_alloc:
278error_secd:
279 goto out;
280}
281
282void wusb_dev_sec_rm(struct wusb_dev *wusb_dev)
283{
284 /* Nothing so far */
285}
286
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100287/**
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 */
David Vrabel4656d5d2008-10-27 17:12:33 +0000296int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100297{
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_ep0_reinit(usb_dev);
316
317 /* Set new (authenticated) address. */
318 result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
319 USB_REQ_SET_ADDRESS, 0,
320 new_address, 0, NULL, 0,
321 1000 /* FIXME: arbitrary */);
322 if (result < 0) {
323 dev_err(dev, "auth failed: can't set address %u: %d\n",
324 new_address, result);
325 goto error_addr;
326 }
327 result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address);
328 if (result < 0)
329 goto error_addr;
330 usb_ep0_reinit(usb_dev);
331 usb_dev->authenticated = 1;
332error_addr:
333error_addr0:
334 return result;
335}
336
337/*
338 *
339 *
340 */
341/* FIXME: split and cleanup */
342int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev,
343 struct wusb_ckhdid *ck)
344{
345 int result = -ENOMEM;
346 struct usb_device *usb_dev = wusb_dev->usb_dev;
347 struct device *dev = &usb_dev->dev;
348 u32 tkid;
349 __le32 tkid_le;
350 struct usb_handshake *hs;
351 struct aes_ccm_nonce ccm_n;
352 u8 mic[8];
353 struct wusb_keydvt_in keydvt_in;
354 struct wusb_keydvt_out keydvt_out;
355
356 hs = kzalloc(3*sizeof(hs[0]), GFP_KERNEL);
357 if (hs == NULL) {
358 dev_err(dev, "can't allocate handshake data\n");
359 goto error_kzalloc;
360 }
361
362 /* We need to turn encryption before beginning the 4way
363 * hshake (WUSB1.0[.3.2.2]) */
364 result = wusb_dev_set_encryption(usb_dev, 1);
365 if (result < 0)
366 goto error_dev_set_encryption;
367
368 tkid = wusbhc_next_tkid(wusbhc, wusb_dev);
369 tkid_le = cpu_to_le32(tkid);
370
371 hs[0].bMessageNumber = 1;
372 hs[0].bStatus = 0;
373 memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID));
374 hs[0].bReserved = 0;
375 memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID));
376 get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce));
377 memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */
378
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100379 result = usb_control_msg(
380 usb_dev, usb_sndctrlpipe(usb_dev, 0),
381 USB_REQ_SET_HANDSHAKE,
382 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
383 1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */);
384 if (result < 0) {
385 dev_err(dev, "Handshake1: request failed: %d\n", result);
386 goto error_hs1;
387 }
388
389 /* Handshake 2, from the device -- need to verify fields */
390 result = usb_control_msg(
391 usb_dev, usb_rcvctrlpipe(usb_dev, 0),
392 USB_REQ_GET_HANDSHAKE,
393 USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
394 2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */);
395 if (result < 0) {
396 dev_err(dev, "Handshake2: request failed: %d\n", result);
397 goto error_hs2;
398 }
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100399
400 result = -EINVAL;
401 if (hs[1].bMessageNumber != 2) {
402 dev_err(dev, "Handshake2 failed: bad message number %u\n",
403 hs[1].bMessageNumber);
404 goto error_hs2;
405 }
406 if (hs[1].bStatus != 0) {
407 dev_err(dev, "Handshake2 failed: bad status %u\n",
408 hs[1].bStatus);
409 goto error_hs2;
410 }
411 if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) {
412 dev_err(dev, "Handshake2 failed: TKID mismatch "
413 "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n",
414 hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2],
415 hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]);
416 goto error_hs2;
417 }
418 if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) {
419 dev_err(dev, "Handshake2 failed: CDID mismatch\n");
420 goto error_hs2;
421 }
422
423 /* Setup the CCM nonce */
424 memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */
425 memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid));
426 ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr;
427 ccm_n.dest_addr.data[0] = wusb_dev->addr;
428 ccm_n.dest_addr.data[1] = 0;
429
430 /* Derive the KCK and PTK from CK, the CCM, H and D nonces */
431 memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce));
432 memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce));
433 result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in);
434 if (result < 0) {
435 dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n",
436 result);
437 goto error_hs2;
438 }
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100439
440 /* Compute MIC and verify it */
441 result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]);
442 if (result < 0) {
443 dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n",
444 result);
445 goto error_hs2;
446 }
447
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100448 if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) {
449 dev_err(dev, "Handshake2 failed: MIC mismatch\n");
450 goto error_hs2;
451 }
452
453 /* Send Handshake3 */
454 hs[2].bMessageNumber = 3;
455 hs[2].bStatus = 0;
456 memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID));
457 hs[2].bReserved = 0;
458 memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID));
459 memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce));
460 result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]);
461 if (result < 0) {
462 dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n",
463 result);
464 goto error_hs2;
465 }
466
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100467 result = usb_control_msg(
468 usb_dev, usb_sndctrlpipe(usb_dev, 0),
469 USB_REQ_SET_HANDSHAKE,
470 USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
471 3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */);
472 if (result < 0) {
473 dev_err(dev, "Handshake3: request failed: %d\n", result);
474 goto error_hs3;
475 }
476
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100477 result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid,
478 keydvt_out.ptk, sizeof(keydvt_out.ptk));
479 if (result < 0)
480 goto error_wusbhc_set_ptk;
481
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100482 result = wusb_dev_set_gtk(wusbhc, wusb_dev);
483 if (result < 0) {
484 dev_err(dev, "Set GTK for device: request failed: %d\n",
485 result);
486 goto error_wusbhc_set_gtk;
487 }
488
489 /* Update the device's address from unauth to auth */
490 if (usb_dev->authenticated == 0) {
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100491 result = wusb_dev_update_address(wusbhc, wusb_dev);
492 if (result < 0)
493 goto error_dev_update_address;
494 }
495 result = 0;
David Vrabelbce83692008-12-22 18:22:50 +0000496 dev_info(dev, "device authenticated\n");
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100497
498error_dev_update_address:
499error_wusbhc_set_gtk:
500error_wusbhc_set_ptk:
501error_hs3:
502error_hs2:
503error_hs1:
504 memset(hs, 0, 3*sizeof(hs[0]));
505 memset(&keydvt_out, 0, sizeof(keydvt_out));
506 memset(&keydvt_in, 0, sizeof(keydvt_in));
507 memset(&ccm_n, 0, sizeof(ccm_n));
508 memset(mic, 0, sizeof(mic));
David Vrabelbce83692008-12-22 18:22:50 +0000509 if (result < 0)
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100510 wusb_dev_set_encryption(usb_dev, 0);
Inaky Perez-Gonzalezd59db762008-09-17 16:34:25 +0100511error_dev_set_encryption:
512 kfree(hs);
513error_kzalloc:
514 return result;
515}
516
517/*
518 * Once all connected and authenticated devices have received the new
519 * GTK, switch the host to using it.
520 */
521static void wusbhc_gtk_rekey_done_work(struct work_struct *work)
522{
523 struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work);
524 size_t key_size = sizeof(wusbhc->gtk.data);
525
526 mutex_lock(&wusbhc->mutex);
527
528 if (--wusbhc->pending_set_gtks == 0)
529 wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size);
530
531 mutex_unlock(&wusbhc->mutex);
532}
533
534static void wusbhc_set_gtk_callback(struct urb *urb)
535{
536 struct wusbhc *wusbhc = urb->context;
537
538 queue_work(wusbd, &wusbhc->gtk_rekey_done_work);
539}
540
541/**
542 * wusbhc_gtk_rekey - generate and distribute a new GTK
543 * @wusbhc: the WUSB host controller
544 *
545 * Generate a new GTK and distribute it to all connected and
546 * authenticated devices. When all devices have the new GTK, the host
547 * starts using it.
548 *
549 * This must be called after every device disconnect (see [WUSB]
550 * section 6.2.11.2).
551 */
552void wusbhc_gtk_rekey(struct wusbhc *wusbhc)
553{
554 static const size_t key_size = sizeof(wusbhc->gtk.data);
555 int p;
556
557 wusbhc_generate_gtk(wusbhc);
558
559 for (p = 0; p < wusbhc->ports_max; p++) {
560 struct wusb_dev *wusb_dev;
561
562 wusb_dev = wusbhc->port[p].wusb_dev;
563 if (!wusb_dev || !wusb_dev->usb_dev | !wusb_dev->usb_dev->authenticated)
564 continue;
565
566 usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev,
567 usb_sndctrlpipe(wusb_dev->usb_dev, 0),
568 (void *)wusb_dev->set_gtk_req,
569 &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
570 wusbhc_set_gtk_callback, wusbhc);
571 if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0)
572 wusbhc->pending_set_gtks++;
573 }
574 if (wusbhc->pending_set_gtks == 0)
575 wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size);
576}