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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 | ||
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 */ | |
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 | */ | |
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 | ||
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 | */ | |
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 | */ | |
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 */ | |
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 | */ | |
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 | */ | |
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 */ | |
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; | |
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 | secd = krealloc(secd, secd_size, GFP_KERNEL); | |
225 | if (secd == NULL) { | |
226 | dev_err(dev, "Can't allocate space for security descriptors\n"); | |
227 | goto out; | |
228 | } | |
229 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, | |
230 | 0, secd, secd_size); | |
231 | if (result < secd_size) { | |
232 | dev_err(dev, "Can't read security descriptor or " | |
233 | "not enough data: %d\n", result); | |
234 | goto out; | |
235 | } | |
236 | bytes = 0; | |
237 | itr = &secd[1]; | |
238 | top = (void *)secd + result; | |
239 | while (itr < top) { | |
240 | etd = itr; | |
241 | if (top - itr < sizeof(*etd)) { | |
242 | dev_err(dev, "BUG: bad device security descriptor; " | |
243 | "not enough data (%zu vs %zu bytes left)\n", | |
244 | top - itr, sizeof(*etd)); | |
245 | break; | |
246 | } | |
247 | if (etd->bLength < sizeof(*etd)) { | |
248 | dev_err(dev, "BUG: bad device encryption descriptor; " | |
249 | "descriptor is too short " | |
250 | "(%u vs %zu needed)\n", | |
251 | etd->bLength, sizeof(*etd)); | |
252 | break; | |
253 | } | |
254 | itr += etd->bLength; | |
255 | bytes += snprintf(buf + bytes, sizeof(buf) - bytes, | |
256 | "%s (0x%02x/%02x) ", | |
257 | wusb_et_name(etd->bEncryptionType), | |
258 | etd->bEncryptionValue, etd->bAuthKeyIndex); | |
259 | if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1) | |
260 | ccm1_etd = etd; | |
261 | } | |
262 | /* This code only supports CCM1 as of now. */ | |
263 | /* FIXME: user has to choose which sec mode to use? | |
264 | * In theory we want CCM */ | |
265 | if (ccm1_etd == NULL) { | |
266 | dev_err(dev, "WUSB device doesn't support CCM1 encryption, " | |
267 | "can't use!\n"); | |
268 | result = -EINVAL; | |
269 | goto out; | |
270 | } | |
271 | wusb_dev->ccm1_etd = *ccm1_etd; | |
272 | dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n", | |
273 | buf, wusb_et_name(ccm1_etd->bEncryptionType), | |
274 | ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex); | |
275 | result = 0; | |
276 | out: | |
277 | kfree(secd); | |
278 | return result; | |
279 | } | |
280 | ||
281 | void wusb_dev_sec_rm(struct wusb_dev *wusb_dev) | |
282 | { | |
283 | /* Nothing so far */ | |
284 | } | |
285 | ||
286 | /** | |
287 | * Update the address of an unauthenticated WUSB device | |
288 | * | |
289 | * Once we have successfully authenticated, we take it to addr0 state | |
290 | * and then to a normal address. | |
291 | * | |
292 | * Before the device's address (as known by it) was usb_dev->devnum | | |
293 | * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum. | |
294 | */ | |
295 | int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) | |
296 | { | |
297 | int result = -ENOMEM; | |
298 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
299 | struct device *dev = &usb_dev->dev; | |
300 | u8 new_address = wusb_dev->addr & 0x7F; | |
301 | ||
302 | /* Set address 0 */ | |
303 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
304 | USB_REQ_SET_ADDRESS, 0, | |
305 | 0, 0, NULL, 0, 1000 /* FIXME: arbitrary */); | |
306 | if (result < 0) { | |
307 | dev_err(dev, "auth failed: can't set address 0: %d\n", | |
308 | result); | |
309 | goto error_addr0; | |
310 | } | |
311 | result = wusb_set_dev_addr(wusbhc, wusb_dev, 0); | |
312 | if (result < 0) | |
313 | goto error_addr0; | |
314 | usb_set_device_state(usb_dev, USB_STATE_DEFAULT); | |
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_set_device_state(usb_dev, USB_STATE_ADDRESS); | |
331 | usb_ep0_reinit(usb_dev); | |
332 | usb_dev->authenticated = 1; | |
333 | error_addr: | |
334 | error_addr0: | |
335 | return result; | |
336 | } | |
337 | ||
338 | /* | |
339 | * | |
340 | * | |
341 | */ | |
342 | /* FIXME: split and cleanup */ | |
343 | int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, | |
344 | struct wusb_ckhdid *ck) | |
345 | { | |
346 | int result = -ENOMEM; | |
347 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
348 | struct device *dev = &usb_dev->dev; | |
349 | u32 tkid; | |
350 | __le32 tkid_le; | |
351 | struct usb_handshake *hs; | |
352 | struct aes_ccm_nonce ccm_n; | |
353 | u8 mic[8]; | |
354 | struct wusb_keydvt_in keydvt_in; | |
355 | struct wusb_keydvt_out keydvt_out; | |
356 | ||
357 | hs = kcalloc(3, sizeof(hs[0]), GFP_KERNEL); | |
358 | if (hs == NULL) { | |
359 | dev_err(dev, "can't allocate handshake data\n"); | |
360 | goto error_kzalloc; | |
361 | } | |
362 | ||
363 | /* We need to turn encryption before beginning the 4way | |
364 | * hshake (WUSB1.0[.3.2.2]) */ | |
365 | result = wusb_dev_set_encryption(usb_dev, 1); | |
366 | if (result < 0) | |
367 | goto error_dev_set_encryption; | |
368 | ||
369 | tkid = wusbhc_next_tkid(wusbhc, wusb_dev); | |
370 | tkid_le = cpu_to_le32(tkid); | |
371 | ||
372 | hs[0].bMessageNumber = 1; | |
373 | hs[0].bStatus = 0; | |
374 | memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID)); | |
375 | hs[0].bReserved = 0; | |
376 | memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID)); | |
377 | get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce)); | |
378 | memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */ | |
379 | ||
380 | result = usb_control_msg( | |
381 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
382 | USB_REQ_SET_HANDSHAKE, | |
383 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
384 | 1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */); | |
385 | if (result < 0) { | |
386 | dev_err(dev, "Handshake1: request failed: %d\n", result); | |
387 | goto error_hs1; | |
388 | } | |
389 | ||
390 | /* Handshake 2, from the device -- need to verify fields */ | |
391 | result = usb_control_msg( | |
392 | usb_dev, usb_rcvctrlpipe(usb_dev, 0), | |
393 | USB_REQ_GET_HANDSHAKE, | |
394 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
395 | 2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */); | |
396 | if (result < 0) { | |
397 | dev_err(dev, "Handshake2: request failed: %d\n", result); | |
398 | goto error_hs2; | |
399 | } | |
400 | ||
401 | result = -EINVAL; | |
402 | if (hs[1].bMessageNumber != 2) { | |
403 | dev_err(dev, "Handshake2 failed: bad message number %u\n", | |
404 | hs[1].bMessageNumber); | |
405 | goto error_hs2; | |
406 | } | |
407 | if (hs[1].bStatus != 0) { | |
408 | dev_err(dev, "Handshake2 failed: bad status %u\n", | |
409 | hs[1].bStatus); | |
410 | goto error_hs2; | |
411 | } | |
412 | if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) { | |
413 | dev_err(dev, "Handshake2 failed: TKID mismatch " | |
414 | "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n", | |
415 | hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2], | |
416 | hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]); | |
417 | goto error_hs2; | |
418 | } | |
419 | if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) { | |
420 | dev_err(dev, "Handshake2 failed: CDID mismatch\n"); | |
421 | goto error_hs2; | |
422 | } | |
423 | ||
424 | /* Setup the CCM nonce */ | |
425 | memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */ | |
426 | memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid)); | |
427 | ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr; | |
428 | ccm_n.dest_addr.data[0] = wusb_dev->addr; | |
429 | ccm_n.dest_addr.data[1] = 0; | |
430 | ||
431 | /* Derive the KCK and PTK from CK, the CCM, H and D nonces */ | |
432 | memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce)); | |
433 | memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce)); | |
434 | result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in); | |
435 | if (result < 0) { | |
436 | dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n", | |
437 | result); | |
438 | goto error_hs2; | |
439 | } | |
440 | ||
441 | /* Compute MIC and verify it */ | |
442 | result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]); | |
443 | if (result < 0) { | |
444 | dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n", | |
445 | result); | |
446 | goto error_hs2; | |
447 | } | |
448 | ||
449 | if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) { | |
450 | dev_err(dev, "Handshake2 failed: MIC mismatch\n"); | |
451 | goto error_hs2; | |
452 | } | |
453 | ||
454 | /* Send Handshake3 */ | |
455 | hs[2].bMessageNumber = 3; | |
456 | hs[2].bStatus = 0; | |
457 | memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID)); | |
458 | hs[2].bReserved = 0; | |
459 | memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID)); | |
460 | memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce)); | |
461 | result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]); | |
462 | if (result < 0) { | |
463 | dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n", | |
464 | result); | |
465 | goto error_hs2; | |
466 | } | |
467 | ||
468 | result = usb_control_msg( | |
469 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
470 | USB_REQ_SET_HANDSHAKE, | |
471 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
472 | 3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */); | |
473 | if (result < 0) { | |
474 | dev_err(dev, "Handshake3: request failed: %d\n", result); | |
475 | goto error_hs3; | |
476 | } | |
477 | ||
478 | result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid, | |
479 | keydvt_out.ptk, sizeof(keydvt_out.ptk)); | |
480 | if (result < 0) | |
481 | goto error_wusbhc_set_ptk; | |
482 | ||
483 | result = wusb_dev_set_gtk(wusbhc, wusb_dev); | |
484 | if (result < 0) { | |
485 | dev_err(dev, "Set GTK for device: request failed: %d\n", | |
486 | result); | |
487 | goto error_wusbhc_set_gtk; | |
488 | } | |
489 | ||
490 | /* Update the device's address from unauth to auth */ | |
491 | if (usb_dev->authenticated == 0) { | |
492 | result = wusb_dev_update_address(wusbhc, wusb_dev); | |
493 | if (result < 0) | |
494 | goto error_dev_update_address; | |
495 | } | |
496 | result = 0; | |
497 | dev_info(dev, "device authenticated\n"); | |
498 | ||
499 | error_dev_update_address: | |
500 | error_wusbhc_set_gtk: | |
501 | error_wusbhc_set_ptk: | |
502 | error_hs3: | |
503 | error_hs2: | |
504 | error_hs1: | |
505 | memset(hs, 0, 3*sizeof(hs[0])); | |
506 | memset(&keydvt_out, 0, sizeof(keydvt_out)); | |
507 | memset(&keydvt_in, 0, sizeof(keydvt_in)); | |
508 | memset(&ccm_n, 0, sizeof(ccm_n)); | |
509 | memset(mic, 0, sizeof(mic)); | |
510 | if (result < 0) | |
511 | wusb_dev_set_encryption(usb_dev, 0); | |
512 | error_dev_set_encryption: | |
513 | kfree(hs); | |
514 | error_kzalloc: | |
515 | return result; | |
516 | } | |
517 | ||
518 | /* | |
519 | * Once all connected and authenticated devices have received the new | |
520 | * GTK, switch the host to using it. | |
521 | */ | |
522 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work) | |
523 | { | |
524 | struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work); | |
525 | size_t key_size = sizeof(wusbhc->gtk.data); | |
526 | ||
527 | mutex_lock(&wusbhc->mutex); | |
528 | ||
529 | if (--wusbhc->pending_set_gtks == 0) | |
530 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); | |
531 | ||
532 | mutex_unlock(&wusbhc->mutex); | |
533 | } | |
534 | ||
535 | static void wusbhc_set_gtk_callback(struct urb *urb) | |
536 | { | |
537 | struct wusbhc *wusbhc = urb->context; | |
538 | ||
539 | queue_work(wusbd, &wusbhc->gtk_rekey_done_work); | |
540 | } | |
541 | ||
542 | /** | |
543 | * wusbhc_gtk_rekey - generate and distribute a new GTK | |
544 | * @wusbhc: the WUSB host controller | |
545 | * | |
546 | * Generate a new GTK and distribute it to all connected and | |
547 | * authenticated devices. When all devices have the new GTK, the host | |
548 | * starts using it. | |
549 | * | |
550 | * This must be called after every device disconnect (see [WUSB] | |
551 | * section 6.2.11.2). | |
552 | */ | |
553 | void wusbhc_gtk_rekey(struct wusbhc *wusbhc) | |
554 | { | |
555 | static const size_t key_size = sizeof(wusbhc->gtk.data); | |
556 | int p; | |
557 | ||
558 | wusbhc_generate_gtk(wusbhc); | |
559 | ||
560 | for (p = 0; p < wusbhc->ports_max; p++) { | |
561 | struct wusb_dev *wusb_dev; | |
562 | ||
563 | wusb_dev = wusbhc->port[p].wusb_dev; | |
564 | if (!wusb_dev || !wusb_dev->usb_dev || !wusb_dev->usb_dev->authenticated) | |
565 | continue; | |
566 | ||
567 | usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev, | |
568 | usb_sndctrlpipe(wusb_dev->usb_dev, 0), | |
569 | (void *)wusb_dev->set_gtk_req, | |
570 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, | |
571 | wusbhc_set_gtk_callback, wusbhc); | |
572 | if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0) | |
573 | wusbhc->pending_set_gtks++; | |
574 | } | |
575 | if (wusbhc->pending_set_gtks == 0) | |
576 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); | |
577 | } |