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Commit | Line | Data |
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d59db761 IPG |
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/usb/ch9.h> | |
27 | #include <linux/random.h> | |
28 | #include "wusbhc.h" | |
29 | ||
d59db761 IPG |
30 | static void wusbhc_set_gtk_callback(struct urb *urb); |
31 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work); | |
32 | ||
33 | int 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 */ | |
49 | void 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 | */ | |
66 | static 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 | ||
84 | static 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 | */ | |
106 | int 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 | */ | |
128 | void wusbhc_sec_stop(struct wusbhc *wusbhc) | |
129 | { | |
130 | cancel_work_sync(&wusbhc->gtk_rekey_done_work); | |
131 | } | |
132 | ||
133 | ||
134 | /** @returns encryption type name */ | |
135 | const 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 | } | |
145 | EXPORT_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 | */ | |
153 | static 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 | */ | |
183 | static 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 */ | |
198 | int 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; | |
b41ecf9a | 203 | struct usb_security_descriptor *secd; |
d59db761 | 204 | const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL; |
d59db761 IPG |
205 | const void *itr, *top; |
206 | char buf[64]; | |
207 | ||
9279095a | 208 | secd = kmalloc(sizeof(*secd), GFP_KERNEL); |
b41ecf9a SP |
209 | if (secd == NULL) { |
210 | result = -ENOMEM; | |
211 | goto out; | |
212 | } | |
213 | ||
d59db761 | 214 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, |
9279095a DV |
215 | 0, secd, sizeof(*secd)); |
216 | if (result < sizeof(*secd)) { | |
d59db761 IPG |
217 | dev_err(dev, "Can't read security descriptor or " |
218 | "not enough data: %d\n", result); | |
b41ecf9a | 219 | goto out; |
d59db761 | 220 | } |
b41ecf9a SP |
221 | secd_size = le16_to_cpu(secd->wTotalLength); |
222 | secd = krealloc(secd, secd_size, GFP_KERNEL); | |
223 | if (secd == NULL) { | |
d59db761 | 224 | dev_err(dev, "Can't allocate space for security descriptors\n"); |
b41ecf9a | 225 | goto out; |
d59db761 IPG |
226 | } |
227 | result = usb_get_descriptor(usb_dev, USB_DT_SECURITY, | |
b41ecf9a | 228 | 0, secd, secd_size); |
d59db761 IPG |
229 | if (result < secd_size) { |
230 | dev_err(dev, "Can't read security descriptor or " | |
231 | "not enough data: %d\n", result); | |
b41ecf9a | 232 | goto out; |
d59db761 | 233 | } |
d59db761 | 234 | bytes = 0; |
b41ecf9a SP |
235 | itr = &secd[1]; |
236 | top = (void *)secd + result; | |
d59db761 IPG |
237 | while (itr < top) { |
238 | etd = itr; | |
239 | if (top - itr < sizeof(*etd)) { | |
240 | dev_err(dev, "BUG: bad device security descriptor; " | |
241 | "not enough data (%zu vs %zu bytes left)\n", | |
242 | top - itr, sizeof(*etd)); | |
243 | break; | |
244 | } | |
245 | if (etd->bLength < sizeof(*etd)) { | |
246 | dev_err(dev, "BUG: bad device encryption descriptor; " | |
247 | "descriptor is too short " | |
248 | "(%u vs %zu needed)\n", | |
249 | etd->bLength, sizeof(*etd)); | |
250 | break; | |
251 | } | |
252 | itr += etd->bLength; | |
253 | bytes += snprintf(buf + bytes, sizeof(buf) - bytes, | |
254 | "%s (0x%02x/%02x) ", | |
255 | wusb_et_name(etd->bEncryptionType), | |
256 | etd->bEncryptionValue, etd->bAuthKeyIndex); | |
257 | if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1) | |
258 | ccm1_etd = etd; | |
259 | } | |
260 | /* This code only supports CCM1 as of now. */ | |
261 | /* FIXME: user has to choose which sec mode to use? | |
262 | * In theory we want CCM */ | |
263 | if (ccm1_etd == NULL) { | |
264 | dev_err(dev, "WUSB device doesn't support CCM1 encryption, " | |
265 | "can't use!\n"); | |
266 | result = -EINVAL; | |
b41ecf9a | 267 | goto out; |
d59db761 IPG |
268 | } |
269 | wusb_dev->ccm1_etd = *ccm1_etd; | |
bce83697 DV |
270 | dev_dbg(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n", |
271 | buf, wusb_et_name(ccm1_etd->bEncryptionType), | |
272 | ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex); | |
d59db761 | 273 | result = 0; |
d59db761 | 274 | out: |
b41ecf9a | 275 | kfree(secd); |
d59db761 | 276 | return result; |
d59db761 IPG |
277 | } |
278 | ||
279 | void wusb_dev_sec_rm(struct wusb_dev *wusb_dev) | |
280 | { | |
281 | /* Nothing so far */ | |
282 | } | |
283 | ||
d59db761 IPG |
284 | /** |
285 | * Update the address of an unauthenticated WUSB device | |
286 | * | |
287 | * Once we have successfully authenticated, we take it to addr0 state | |
288 | * and then to a normal address. | |
289 | * | |
290 | * Before the device's address (as known by it) was usb_dev->devnum | | |
291 | * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum. | |
292 | */ | |
4656d5de | 293 | int wusb_dev_update_address(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev) |
d59db761 IPG |
294 | { |
295 | int result = -ENOMEM; | |
296 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
297 | struct device *dev = &usb_dev->dev; | |
298 | u8 new_address = wusb_dev->addr & 0x7F; | |
299 | ||
300 | /* Set address 0 */ | |
301 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
302 | USB_REQ_SET_ADDRESS, 0, | |
303 | 0, 0, NULL, 0, 1000 /* FIXME: arbitrary */); | |
304 | if (result < 0) { | |
305 | dev_err(dev, "auth failed: can't set address 0: %d\n", | |
306 | result); | |
307 | goto error_addr0; | |
308 | } | |
309 | result = wusb_set_dev_addr(wusbhc, wusb_dev, 0); | |
310 | if (result < 0) | |
311 | goto error_addr0; | |
6da9c990 | 312 | usb_set_device_state(usb_dev, USB_STATE_DEFAULT); |
d59db761 IPG |
313 | usb_ep0_reinit(usb_dev); |
314 | ||
315 | /* Set new (authenticated) address. */ | |
316 | result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
317 | USB_REQ_SET_ADDRESS, 0, | |
318 | new_address, 0, NULL, 0, | |
319 | 1000 /* FIXME: arbitrary */); | |
320 | if (result < 0) { | |
321 | dev_err(dev, "auth failed: can't set address %u: %d\n", | |
322 | new_address, result); | |
323 | goto error_addr; | |
324 | } | |
325 | result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address); | |
326 | if (result < 0) | |
327 | goto error_addr; | |
6da9c990 | 328 | usb_set_device_state(usb_dev, USB_STATE_ADDRESS); |
d59db761 IPG |
329 | usb_ep0_reinit(usb_dev); |
330 | usb_dev->authenticated = 1; | |
331 | error_addr: | |
332 | error_addr0: | |
333 | return result; | |
334 | } | |
335 | ||
336 | /* | |
337 | * | |
338 | * | |
339 | */ | |
340 | /* FIXME: split and cleanup */ | |
341 | int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev, | |
342 | struct wusb_ckhdid *ck) | |
343 | { | |
344 | int result = -ENOMEM; | |
345 | struct usb_device *usb_dev = wusb_dev->usb_dev; | |
346 | struct device *dev = &usb_dev->dev; | |
347 | u32 tkid; | |
348 | __le32 tkid_le; | |
349 | struct usb_handshake *hs; | |
350 | struct aes_ccm_nonce ccm_n; | |
351 | u8 mic[8]; | |
352 | struct wusb_keydvt_in keydvt_in; | |
353 | struct wusb_keydvt_out keydvt_out; | |
354 | ||
355 | hs = kzalloc(3*sizeof(hs[0]), GFP_KERNEL); | |
356 | if (hs == NULL) { | |
357 | dev_err(dev, "can't allocate handshake data\n"); | |
358 | goto error_kzalloc; | |
359 | } | |
360 | ||
361 | /* We need to turn encryption before beginning the 4way | |
362 | * hshake (WUSB1.0[.3.2.2]) */ | |
363 | result = wusb_dev_set_encryption(usb_dev, 1); | |
364 | if (result < 0) | |
365 | goto error_dev_set_encryption; | |
366 | ||
367 | tkid = wusbhc_next_tkid(wusbhc, wusb_dev); | |
368 | tkid_le = cpu_to_le32(tkid); | |
369 | ||
370 | hs[0].bMessageNumber = 1; | |
371 | hs[0].bStatus = 0; | |
372 | memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID)); | |
373 | hs[0].bReserved = 0; | |
374 | memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID)); | |
375 | get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce)); | |
376 | memset(hs[0].MIC, 0, sizeof(hs[0].MIC)); /* Per WUSB1.0[T7-22] */ | |
377 | ||
d59db761 IPG |
378 | result = usb_control_msg( |
379 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
380 | USB_REQ_SET_HANDSHAKE, | |
381 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
382 | 1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */); | |
383 | if (result < 0) { | |
384 | dev_err(dev, "Handshake1: request failed: %d\n", result); | |
385 | goto error_hs1; | |
386 | } | |
387 | ||
388 | /* Handshake 2, from the device -- need to verify fields */ | |
389 | result = usb_control_msg( | |
390 | usb_dev, usb_rcvctrlpipe(usb_dev, 0), | |
391 | USB_REQ_GET_HANDSHAKE, | |
392 | USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
393 | 2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */); | |
394 | if (result < 0) { | |
395 | dev_err(dev, "Handshake2: request failed: %d\n", result); | |
396 | goto error_hs2; | |
397 | } | |
d59db761 IPG |
398 | |
399 | result = -EINVAL; | |
400 | if (hs[1].bMessageNumber != 2) { | |
401 | dev_err(dev, "Handshake2 failed: bad message number %u\n", | |
402 | hs[1].bMessageNumber); | |
403 | goto error_hs2; | |
404 | } | |
405 | if (hs[1].bStatus != 0) { | |
406 | dev_err(dev, "Handshake2 failed: bad status %u\n", | |
407 | hs[1].bStatus); | |
408 | goto error_hs2; | |
409 | } | |
410 | if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) { | |
411 | dev_err(dev, "Handshake2 failed: TKID mismatch " | |
412 | "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n", | |
413 | hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2], | |
414 | hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]); | |
415 | goto error_hs2; | |
416 | } | |
417 | if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) { | |
418 | dev_err(dev, "Handshake2 failed: CDID mismatch\n"); | |
419 | goto error_hs2; | |
420 | } | |
421 | ||
422 | /* Setup the CCM nonce */ | |
423 | memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn)); /* Per WUSB1.0[6.5.2] */ | |
424 | memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid)); | |
425 | ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr; | |
426 | ccm_n.dest_addr.data[0] = wusb_dev->addr; | |
427 | ccm_n.dest_addr.data[1] = 0; | |
428 | ||
429 | /* Derive the KCK and PTK from CK, the CCM, H and D nonces */ | |
430 | memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce)); | |
431 | memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce)); | |
432 | result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in); | |
433 | if (result < 0) { | |
434 | dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n", | |
435 | result); | |
436 | goto error_hs2; | |
437 | } | |
d59db761 IPG |
438 | |
439 | /* Compute MIC and verify it */ | |
440 | result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]); | |
441 | if (result < 0) { | |
442 | dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n", | |
443 | result); | |
444 | goto error_hs2; | |
445 | } | |
446 | ||
d59db761 IPG |
447 | if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) { |
448 | dev_err(dev, "Handshake2 failed: MIC mismatch\n"); | |
449 | goto error_hs2; | |
450 | } | |
451 | ||
452 | /* Send Handshake3 */ | |
453 | hs[2].bMessageNumber = 3; | |
454 | hs[2].bStatus = 0; | |
455 | memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID)); | |
456 | hs[2].bReserved = 0; | |
457 | memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID)); | |
458 | memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce)); | |
459 | result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]); | |
460 | if (result < 0) { | |
461 | dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n", | |
462 | result); | |
463 | goto error_hs2; | |
464 | } | |
465 | ||
d59db761 IPG |
466 | result = usb_control_msg( |
467 | usb_dev, usb_sndctrlpipe(usb_dev, 0), | |
468 | USB_REQ_SET_HANDSHAKE, | |
469 | USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE, | |
470 | 3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */); | |
471 | if (result < 0) { | |
472 | dev_err(dev, "Handshake3: request failed: %d\n", result); | |
473 | goto error_hs3; | |
474 | } | |
475 | ||
d59db761 IPG |
476 | result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid, |
477 | keydvt_out.ptk, sizeof(keydvt_out.ptk)); | |
478 | if (result < 0) | |
479 | goto error_wusbhc_set_ptk; | |
480 | ||
d59db761 IPG |
481 | result = wusb_dev_set_gtk(wusbhc, wusb_dev); |
482 | if (result < 0) { | |
483 | dev_err(dev, "Set GTK for device: request failed: %d\n", | |
484 | result); | |
485 | goto error_wusbhc_set_gtk; | |
486 | } | |
487 | ||
488 | /* Update the device's address from unauth to auth */ | |
489 | if (usb_dev->authenticated == 0) { | |
d59db761 IPG |
490 | result = wusb_dev_update_address(wusbhc, wusb_dev); |
491 | if (result < 0) | |
492 | goto error_dev_update_address; | |
493 | } | |
494 | result = 0; | |
bce83697 | 495 | dev_info(dev, "device authenticated\n"); |
d59db761 IPG |
496 | |
497 | error_dev_update_address: | |
498 | error_wusbhc_set_gtk: | |
499 | error_wusbhc_set_ptk: | |
500 | error_hs3: | |
501 | error_hs2: | |
502 | error_hs1: | |
503 | memset(hs, 0, 3*sizeof(hs[0])); | |
504 | memset(&keydvt_out, 0, sizeof(keydvt_out)); | |
505 | memset(&keydvt_in, 0, sizeof(keydvt_in)); | |
506 | memset(&ccm_n, 0, sizeof(ccm_n)); | |
507 | memset(mic, 0, sizeof(mic)); | |
bce83697 | 508 | if (result < 0) |
d59db761 | 509 | wusb_dev_set_encryption(usb_dev, 0); |
d59db761 IPG |
510 | error_dev_set_encryption: |
511 | kfree(hs); | |
512 | error_kzalloc: | |
513 | return result; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Once all connected and authenticated devices have received the new | |
518 | * GTK, switch the host to using it. | |
519 | */ | |
520 | static void wusbhc_gtk_rekey_done_work(struct work_struct *work) | |
521 | { | |
522 | struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work); | |
523 | size_t key_size = sizeof(wusbhc->gtk.data); | |
524 | ||
525 | mutex_lock(&wusbhc->mutex); | |
526 | ||
527 | if (--wusbhc->pending_set_gtks == 0) | |
528 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); | |
529 | ||
530 | mutex_unlock(&wusbhc->mutex); | |
531 | } | |
532 | ||
533 | static void wusbhc_set_gtk_callback(struct urb *urb) | |
534 | { | |
535 | struct wusbhc *wusbhc = urb->context; | |
536 | ||
537 | queue_work(wusbd, &wusbhc->gtk_rekey_done_work); | |
538 | } | |
539 | ||
540 | /** | |
541 | * wusbhc_gtk_rekey - generate and distribute a new GTK | |
542 | * @wusbhc: the WUSB host controller | |
543 | * | |
544 | * Generate a new GTK and distribute it to all connected and | |
545 | * authenticated devices. When all devices have the new GTK, the host | |
546 | * starts using it. | |
547 | * | |
548 | * This must be called after every device disconnect (see [WUSB] | |
549 | * section 6.2.11.2). | |
550 | */ | |
551 | void wusbhc_gtk_rekey(struct wusbhc *wusbhc) | |
552 | { | |
553 | static const size_t key_size = sizeof(wusbhc->gtk.data); | |
554 | int p; | |
555 | ||
556 | wusbhc_generate_gtk(wusbhc); | |
557 | ||
558 | for (p = 0; p < wusbhc->ports_max; p++) { | |
559 | struct wusb_dev *wusb_dev; | |
560 | ||
561 | wusb_dev = wusbhc->port[p].wusb_dev; | |
542d886b | 562 | if (!wusb_dev || !wusb_dev->usb_dev || !wusb_dev->usb_dev->authenticated) |
d59db761 IPG |
563 | continue; |
564 | ||
565 | usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev, | |
566 | usb_sndctrlpipe(wusb_dev->usb_dev, 0), | |
567 | (void *)wusb_dev->set_gtk_req, | |
568 | &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength, | |
569 | wusbhc_set_gtk_callback, wusbhc); | |
570 | if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0) | |
571 | wusbhc->pending_set_gtks++; | |
572 | } | |
573 | if (wusbhc->pending_set_gtks == 0) | |
574 | wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size); | |
575 | } |