1 /*
2 * Wi-Fi Protected Setup - attribute building
3 * Copyright (c) 2008-2016, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "crypto/aes_wrap.h"
13 #include "crypto/crypto.h"
14 #include "crypto/dh_group5.h"
15 #include "crypto/sha256.h"
16 #include "crypto/random.h"
17 #include "common/ieee802_11_defs.h"
18 #include "wps_i.h"
19
20
wps_build_public_key(struct wps_data * wps,struct wpabuf * msg)21 int wps_build_public_key(struct wps_data *wps, struct wpabuf *msg)
22 {
23 struct wpabuf *pubkey = NULL;
24
25 wpa_printf(MSG_DEBUG, "WPS: * Public Key");
26 wpabuf_clear_free(wps->dh_privkey);
27 wps->dh_privkey = NULL;
28 if (wps->dev_pw_id != DEV_PW_DEFAULT && wps->wps->dh_privkey &&
29 wps->wps->dh_ctx) {
30 wpa_printf(MSG_DEBUG, "WPS: Using pre-configured DH keys");
31 if (wps->wps->dh_pubkey == NULL) {
32 wpa_printf(MSG_DEBUG,
33 "WPS: wps->wps->dh_pubkey == NULL");
34 return -1;
35 }
36 wps->dh_privkey = wpabuf_dup(wps->wps->dh_privkey);
37 wps->dh_ctx = wps->wps->dh_ctx;
38 wps->wps->dh_ctx = NULL;
39 pubkey = wpabuf_dup(wps->wps->dh_pubkey);
40 #ifdef CONFIG_WPS_NFC
41 } else if ((wps->dev_pw_id >= 0x10 ||
42 wps->dev_pw_id == DEV_PW_NFC_CONNECTION_HANDOVER) &&
43 (wps->wps->ap ||
44 (wps->wps->ap_nfc_dh_pubkey &&
45 wps->wps->ap_nfc_dev_pw_id ==
46 DEV_PW_NFC_CONNECTION_HANDOVER &&
47 wps->dev_pw_id == DEV_PW_NFC_CONNECTION_HANDOVER)) &&
48 (wps->dev_pw_id == wps->wps->ap_nfc_dev_pw_id ||
49 wps->wps->ap_nfc_dh_pubkey)) {
50 wpa_printf(MSG_DEBUG, "WPS: Using NFC password token DH keys");
51 if (wps->wps->ap_nfc_dh_privkey == NULL) {
52 wpa_printf(MSG_DEBUG,
53 "WPS: wps->wps->ap_nfc_dh_privkey == NULL");
54 return -1;
55 }
56 if (wps->wps->ap_nfc_dh_pubkey == NULL) {
57 wpa_printf(MSG_DEBUG,
58 "WPS: wps->wps->ap_nfc_dh_pubkey == NULL");
59 return -1;
60 }
61 wps->dh_privkey = wpabuf_dup(wps->wps->ap_nfc_dh_privkey);
62 pubkey = wpabuf_dup(wps->wps->ap_nfc_dh_pubkey);
63 if (wps->dh_privkey && pubkey)
64 wps->dh_ctx = dh5_init_fixed(wps->dh_privkey, pubkey);
65 #endif /* CONFIG_WPS_NFC */
66 } else {
67 wpa_printf(MSG_DEBUG, "WPS: Generate new DH keys");
68 dh5_free(wps->dh_ctx);
69 wps->dh_ctx = dh5_init(&wps->dh_privkey, &pubkey);
70 pubkey = wpabuf_zeropad(pubkey, 192);
71 }
72 if (wps->dh_ctx == NULL || wps->dh_privkey == NULL || pubkey == NULL) {
73 wpa_printf(MSG_DEBUG, "WPS: Failed to initialize "
74 "Diffie-Hellman handshake");
75 wpabuf_free(pubkey);
76 return -1;
77 }
78 wpa_hexdump_buf_key(MSG_DEBUG, "WPS: DH Private Key", wps->dh_privkey);
79 wpa_hexdump_buf(MSG_DEBUG, "WPS: DH own Public Key", pubkey);
80
81 wpabuf_put_be16(msg, ATTR_PUBLIC_KEY);
82 wpabuf_put_be16(msg, wpabuf_len(pubkey));
83 wpabuf_put_buf(msg, pubkey);
84
85 if (wps->registrar) {
86 wpabuf_free(wps->dh_pubkey_r);
87 wps->dh_pubkey_r = pubkey;
88 } else {
89 wpabuf_free(wps->dh_pubkey_e);
90 wps->dh_pubkey_e = pubkey;
91 }
92
93 return 0;
94 }
95
96
wps_build_req_type(struct wpabuf * msg,enum wps_request_type type)97 int wps_build_req_type(struct wpabuf *msg, enum wps_request_type type)
98 {
99 wpa_printf(MSG_DEBUG, "WPS: * Request Type");
100 wpabuf_put_be16(msg, ATTR_REQUEST_TYPE);
101 wpabuf_put_be16(msg, 1);
102 wpabuf_put_u8(msg, type);
103 return 0;
104 }
105
106
wps_build_resp_type(struct wpabuf * msg,enum wps_response_type type)107 int wps_build_resp_type(struct wpabuf *msg, enum wps_response_type type)
108 {
109 wpa_printf(MSG_DEBUG, "WPS: * Response Type (%d)", type);
110 wpabuf_put_be16(msg, ATTR_RESPONSE_TYPE);
111 wpabuf_put_be16(msg, 1);
112 wpabuf_put_u8(msg, type);
113 return 0;
114 }
115
116
wps_build_config_methods(struct wpabuf * msg,u16 methods)117 int wps_build_config_methods(struct wpabuf *msg, u16 methods)
118 {
119 wpa_printf(MSG_DEBUG, "WPS: * Config Methods (%x)", methods);
120 wpabuf_put_be16(msg, ATTR_CONFIG_METHODS);
121 wpabuf_put_be16(msg, 2);
122 wpabuf_put_be16(msg, methods);
123 return 0;
124 }
125
126
wps_build_uuid_e(struct wpabuf * msg,const u8 * uuid)127 int wps_build_uuid_e(struct wpabuf *msg, const u8 *uuid)
128 {
129 if (wpabuf_tailroom(msg) < 4 + WPS_UUID_LEN)
130 return -1;
131 wpa_printf(MSG_DEBUG, "WPS: * UUID-E");
132 wpabuf_put_be16(msg, ATTR_UUID_E);
133 wpabuf_put_be16(msg, WPS_UUID_LEN);
134 wpabuf_put_data(msg, uuid, WPS_UUID_LEN);
135 return 0;
136 }
137
138
wps_build_dev_password_id(struct wpabuf * msg,u16 id)139 int wps_build_dev_password_id(struct wpabuf *msg, u16 id)
140 {
141 wpa_printf(MSG_DEBUG, "WPS: * Device Password ID (%d)", id);
142 wpabuf_put_be16(msg, ATTR_DEV_PASSWORD_ID);
143 wpabuf_put_be16(msg, 2);
144 wpabuf_put_be16(msg, id);
145 return 0;
146 }
147
148
wps_build_config_error(struct wpabuf * msg,u16 err)149 int wps_build_config_error(struct wpabuf *msg, u16 err)
150 {
151 wpa_printf(MSG_DEBUG, "WPS: * Configuration Error (%d)", err);
152 wpabuf_put_be16(msg, ATTR_CONFIG_ERROR);
153 wpabuf_put_be16(msg, 2);
154 wpabuf_put_be16(msg, err);
155 return 0;
156 }
157
158
wps_build_authenticator(struct wps_data * wps,struct wpabuf * msg)159 int wps_build_authenticator(struct wps_data *wps, struct wpabuf *msg)
160 {
161 u8 hash[SHA256_MAC_LEN];
162 const u8 *addr[2];
163 size_t len[2];
164
165 if (wps->last_msg == NULL) {
166 wpa_printf(MSG_DEBUG, "WPS: Last message not available for "
167 "building authenticator");
168 return -1;
169 }
170
171 /* Authenticator = HMAC-SHA256_AuthKey(M_prev || M_curr*)
172 * (M_curr* is M_curr without the Authenticator attribute)
173 */
174 addr[0] = wpabuf_head(wps->last_msg);
175 len[0] = wpabuf_len(wps->last_msg);
176 addr[1] = wpabuf_head(msg);
177 len[1] = wpabuf_len(msg);
178 if (hmac_sha256_vector(wps->authkey, WPS_AUTHKEY_LEN, 2, addr, len,
179 hash) < 0)
180 return -1;
181
182 wpa_printf(MSG_DEBUG, "WPS: * Authenticator");
183 wpabuf_put_be16(msg, ATTR_AUTHENTICATOR);
184 wpabuf_put_be16(msg, WPS_AUTHENTICATOR_LEN);
185 wpabuf_put_data(msg, hash, WPS_AUTHENTICATOR_LEN);
186
187 return 0;
188 }
189
190
wps_build_version(struct wpabuf * msg)191 int wps_build_version(struct wpabuf *msg)
192 {
193 /*
194 * Note: This attribute is deprecated and set to hardcoded 0x10 for
195 * backwards compatibility reasons. The real version negotiation is
196 * done with Version2.
197 */
198 if (wpabuf_tailroom(msg) < 5)
199 return -1;
200 wpa_printf(MSG_DEBUG, "WPS: * Version (hardcoded 0x10)");
201 wpabuf_put_be16(msg, ATTR_VERSION);
202 wpabuf_put_be16(msg, 1);
203 wpabuf_put_u8(msg, 0x10);
204 return 0;
205 }
206
207
wps_build_wfa_ext(struct wpabuf * msg,int req_to_enroll,const u8 * auth_macs,size_t auth_macs_count,u8 multi_ap_subelem)208 int wps_build_wfa_ext(struct wpabuf *msg, int req_to_enroll,
209 const u8 *auth_macs, size_t auth_macs_count,
210 u8 multi_ap_subelem)
211 {
212 u8 *len;
213
214 #ifdef CONFIG_WPS_TESTING
215 if (WPS_VERSION == 0x10)
216 return 0;
217 #endif /* CONFIG_WPS_TESTING */
218
219 if (wpabuf_tailroom(msg) <
220 7 + 3 + (req_to_enroll ? 3 : 0) +
221 (auth_macs ? 2 + auth_macs_count * ETH_ALEN : 0))
222 return -1;
223 wpabuf_put_be16(msg, ATTR_VENDOR_EXT);
224 len = wpabuf_put(msg, 2); /* to be filled */
225 wpabuf_put_be24(msg, WPS_VENDOR_ID_WFA);
226
227 wpa_printf(MSG_DEBUG, "WPS: * Version2 (0x%x)", WPS_VERSION);
228 wpabuf_put_u8(msg, WFA_ELEM_VERSION2);
229 wpabuf_put_u8(msg, 1);
230 wpabuf_put_u8(msg, WPS_VERSION);
231
232 if (req_to_enroll) {
233 wpa_printf(MSG_DEBUG, "WPS: * Request to Enroll (1)");
234 wpabuf_put_u8(msg, WFA_ELEM_REQUEST_TO_ENROLL);
235 wpabuf_put_u8(msg, 1);
236 wpabuf_put_u8(msg, 1);
237 }
238
239 if (auth_macs && auth_macs_count) {
240 size_t i;
241 wpa_printf(MSG_DEBUG, "WPS: * AuthorizedMACs (count=%d)",
242 (int) auth_macs_count);
243 wpabuf_put_u8(msg, WFA_ELEM_AUTHORIZEDMACS);
244 wpabuf_put_u8(msg, auth_macs_count * ETH_ALEN);
245 wpabuf_put_data(msg, auth_macs, auth_macs_count * ETH_ALEN);
246 for (i = 0; i < auth_macs_count; i++)
247 wpa_printf(MSG_DEBUG, "WPS: AuthorizedMAC: " MACSTR,
248 MAC2STR(&auth_macs[i * ETH_ALEN]));
249 }
250
251 if (multi_ap_subelem) {
252 wpa_printf(MSG_DEBUG, "WPS: * Multi-AP (0x%x)",
253 multi_ap_subelem);
254 wpabuf_put_u8(msg, WFA_ELEM_MULTI_AP);
255 wpabuf_put_u8(msg, 1); /* length */
256 wpabuf_put_u8(msg, multi_ap_subelem);
257 }
258
259 WPA_PUT_BE16(len, (u8 *) wpabuf_put(msg, 0) - len - 2);
260
261 #ifdef CONFIG_WPS_TESTING
262 if (WPS_VERSION > 0x20) {
263 if (wpabuf_tailroom(msg) < 5)
264 return -1;
265 wpa_printf(MSG_DEBUG, "WPS: * Extensibility Testing - extra "
266 "attribute");
267 wpabuf_put_be16(msg, ATTR_EXTENSIBILITY_TEST);
268 wpabuf_put_be16(msg, 1);
269 wpabuf_put_u8(msg, 42);
270 }
271 #endif /* CONFIG_WPS_TESTING */
272 return 0;
273 }
274
275
wps_build_msg_type(struct wpabuf * msg,enum wps_msg_type msg_type)276 int wps_build_msg_type(struct wpabuf *msg, enum wps_msg_type msg_type)
277 {
278 wpa_printf(MSG_DEBUG, "WPS: * Message Type (%d)", msg_type);
279 wpabuf_put_be16(msg, ATTR_MSG_TYPE);
280 wpabuf_put_be16(msg, 1);
281 wpabuf_put_u8(msg, msg_type);
282 return 0;
283 }
284
285
wps_build_enrollee_nonce(struct wps_data * wps,struct wpabuf * msg)286 int wps_build_enrollee_nonce(struct wps_data *wps, struct wpabuf *msg)
287 {
288 wpa_printf(MSG_DEBUG, "WPS: * Enrollee Nonce");
289 wpabuf_put_be16(msg, ATTR_ENROLLEE_NONCE);
290 wpabuf_put_be16(msg, WPS_NONCE_LEN);
291 wpabuf_put_data(msg, wps->nonce_e, WPS_NONCE_LEN);
292 return 0;
293 }
294
295
wps_build_registrar_nonce(struct wps_data * wps,struct wpabuf * msg)296 int wps_build_registrar_nonce(struct wps_data *wps, struct wpabuf *msg)
297 {
298 wpa_printf(MSG_DEBUG, "WPS: * Registrar Nonce");
299 wpabuf_put_be16(msg, ATTR_REGISTRAR_NONCE);
300 wpabuf_put_be16(msg, WPS_NONCE_LEN);
301 wpabuf_put_data(msg, wps->nonce_r, WPS_NONCE_LEN);
302 return 0;
303 }
304
305
wps_build_auth_type_flags(struct wps_data * wps,struct wpabuf * msg)306 int wps_build_auth_type_flags(struct wps_data *wps, struct wpabuf *msg)
307 {
308 u16 auth_types = WPS_AUTH_TYPES;
309 /* WPA/WPA2-Enterprise enrollment not supported through WPS */
310 auth_types &= ~WPS_AUTH_WPA;
311 auth_types &= ~WPS_AUTH_WPA2;
312 auth_types &= ~WPS_AUTH_SHARED;
313 #ifdef CONFIG_NO_TKIP
314 auth_types &= ~WPS_AUTH_WPAPSK;
315 #endif /* CONFIG_NO_TKIP */
316 #ifdef CONFIG_WPS_TESTING
317 if (wps_force_auth_types_in_use) {
318 wpa_printf(MSG_DEBUG,
319 "WPS: Testing - replace auth type 0x%x with 0x%x",
320 auth_types, wps_force_auth_types);
321 auth_types = wps_force_auth_types;
322 }
323 #endif /* CONFIG_WPS_TESTING */
324 wpa_printf(MSG_DEBUG, "WPS: * Authentication Type Flags (0x%x)",
325 auth_types);
326 wpabuf_put_be16(msg, ATTR_AUTH_TYPE_FLAGS);
327 wpabuf_put_be16(msg, 2);
328 wpabuf_put_be16(msg, auth_types);
329 return 0;
330 }
331
332
wps_build_encr_type_flags(struct wps_data * wps,struct wpabuf * msg)333 int wps_build_encr_type_flags(struct wps_data *wps, struct wpabuf *msg)
334 {
335 u16 encr_types = WPS_ENCR_TYPES;
336 encr_types &= ~WPS_ENCR_WEP;
337 #ifdef CONFIG_NO_TKIP
338 encr_types &= ~WPS_ENCR_TKIP;
339 #endif /* CONFIG_NO_TKIP */
340 #ifdef CONFIG_WPS_TESTING
341 if (wps_force_encr_types_in_use) {
342 wpa_printf(MSG_DEBUG,
343 "WPS: Testing - replace encr type 0x%x with 0x%x",
344 encr_types, wps_force_encr_types);
345 encr_types = wps_force_encr_types;
346 }
347 #endif /* CONFIG_WPS_TESTING */
348 wpa_printf(MSG_DEBUG, "WPS: * Encryption Type Flags (0x%x)",
349 encr_types);
350 wpabuf_put_be16(msg, ATTR_ENCR_TYPE_FLAGS);
351 wpabuf_put_be16(msg, 2);
352 wpabuf_put_be16(msg, encr_types);
353 return 0;
354 }
355
356
wps_build_conn_type_flags(struct wps_data * wps,struct wpabuf * msg)357 int wps_build_conn_type_flags(struct wps_data *wps, struct wpabuf *msg)
358 {
359 wpa_printf(MSG_DEBUG, "WPS: * Connection Type Flags");
360 wpabuf_put_be16(msg, ATTR_CONN_TYPE_FLAGS);
361 wpabuf_put_be16(msg, 1);
362 wpabuf_put_u8(msg, WPS_CONN_ESS);
363 return 0;
364 }
365
366
wps_build_assoc_state(struct wps_data * wps,struct wpabuf * msg)367 int wps_build_assoc_state(struct wps_data *wps, struct wpabuf *msg)
368 {
369 wpa_printf(MSG_DEBUG, "WPS: * Association State");
370 wpabuf_put_be16(msg, ATTR_ASSOC_STATE);
371 wpabuf_put_be16(msg, 2);
372 wpabuf_put_be16(msg, WPS_ASSOC_NOT_ASSOC);
373 return 0;
374 }
375
376
wps_build_key_wrap_auth(struct wps_data * wps,struct wpabuf * msg)377 int wps_build_key_wrap_auth(struct wps_data *wps, struct wpabuf *msg)
378 {
379 u8 hash[SHA256_MAC_LEN];
380
381 wpa_printf(MSG_DEBUG, "WPS: * Key Wrap Authenticator");
382 if (hmac_sha256(wps->authkey, WPS_AUTHKEY_LEN, wpabuf_head(msg),
383 wpabuf_len(msg), hash) < 0)
384 return -1;
385
386 wpabuf_put_be16(msg, ATTR_KEY_WRAP_AUTH);
387 wpabuf_put_be16(msg, WPS_KWA_LEN);
388 wpabuf_put_data(msg, hash, WPS_KWA_LEN);
389 return 0;
390 }
391
392
wps_build_encr_settings(struct wps_data * wps,struct wpabuf * msg,struct wpabuf * plain)393 int wps_build_encr_settings(struct wps_data *wps, struct wpabuf *msg,
394 struct wpabuf *plain)
395 {
396 size_t pad_len;
397 const size_t block_size = 16;
398 u8 *iv, *data;
399
400 wpa_printf(MSG_DEBUG, "WPS: * Encrypted Settings");
401
402 /* PKCS#5 v2.0 pad */
403 pad_len = block_size - wpabuf_len(plain) % block_size;
404 os_memset(wpabuf_put(plain, pad_len), pad_len, pad_len);
405
406 wpabuf_put_be16(msg, ATTR_ENCR_SETTINGS);
407 wpabuf_put_be16(msg, block_size + wpabuf_len(plain));
408
409 iv = wpabuf_put(msg, block_size);
410 if (random_get_bytes(iv, block_size) < 0)
411 return -1;
412
413 data = wpabuf_put(msg, 0);
414 wpabuf_put_buf(msg, plain);
415 if (aes_128_cbc_encrypt(wps->keywrapkey, iv, data, wpabuf_len(plain)))
416 return -1;
417
418 return 0;
419 }
420
421
422 #ifdef CONFIG_WPS_OOB
wps_build_oob_dev_pw(struct wpabuf * msg,u16 dev_pw_id,const struct wpabuf * pubkey,const u8 * dev_pw,size_t dev_pw_len)423 int wps_build_oob_dev_pw(struct wpabuf *msg, u16 dev_pw_id,
424 const struct wpabuf *pubkey, const u8 *dev_pw,
425 size_t dev_pw_len)
426 {
427 size_t hash_len;
428 const u8 *addr[1];
429 u8 pubkey_hash[WPS_HASH_LEN];
430
431 wpa_printf(MSG_DEBUG, "WPS: * OOB Device Password (dev_pw_id=%u)",
432 dev_pw_id);
433 addr[0] = wpabuf_head(pubkey);
434 hash_len = wpabuf_len(pubkey);
435 if (sha256_vector(1, addr, &hash_len, pubkey_hash) < 0)
436 return -1;
437 #ifdef CONFIG_WPS_TESTING
438 if (wps_corrupt_pkhash) {
439 wpa_hexdump(MSG_DEBUG, "WPS: Real Public Key Hash",
440 pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
441 wpa_printf(MSG_INFO, "WPS: Testing - corrupt public key hash");
442 pubkey_hash[WPS_OOB_PUBKEY_HASH_LEN - 2]++;
443 }
444 #endif /* CONFIG_WPS_TESTING */
445
446 wpabuf_put_be16(msg, ATTR_OOB_DEVICE_PASSWORD);
447 wpabuf_put_be16(msg, WPS_OOB_PUBKEY_HASH_LEN + 2 + dev_pw_len);
448 wpa_hexdump(MSG_DEBUG, "WPS: Public Key Hash",
449 pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
450 wpabuf_put_data(msg, pubkey_hash, WPS_OOB_PUBKEY_HASH_LEN);
451 wpabuf_put_be16(msg, dev_pw_id);
452 if (dev_pw) {
453 wpa_hexdump_key(MSG_DEBUG, "WPS: OOB Device Password",
454 dev_pw, dev_pw_len);
455 wpabuf_put_data(msg, dev_pw, dev_pw_len);
456 }
457
458 return 0;
459 }
460 #endif /* CONFIG_WPS_OOB */
461
462
463 /* Encapsulate WPS IE data with one (or more, if needed) IE headers */
wps_ie_encapsulate(struct wpabuf * data)464 struct wpabuf * wps_ie_encapsulate(struct wpabuf *data)
465 {
466 struct wpabuf *ie;
467 const u8 *pos, *end;
468
469 ie = wpabuf_alloc(wpabuf_len(data) + 100);
470 if (ie == NULL) {
471 wpabuf_free(data);
472 return NULL;
473 }
474
475 pos = wpabuf_head(data);
476 end = pos + wpabuf_len(data);
477
478 while (end > pos) {
479 size_t frag_len = end - pos;
480 if (frag_len > 251)
481 frag_len = 251;
482 wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
483 wpabuf_put_u8(ie, 4 + frag_len);
484 wpabuf_put_be32(ie, WPS_DEV_OUI_WFA);
485 wpabuf_put_data(ie, pos, frag_len);
486 pos += frag_len;
487 }
488
489 wpabuf_free(data);
490
491 return ie;
492 }
493
494
wps_build_mac_addr(struct wpabuf * msg,const u8 * addr)495 int wps_build_mac_addr(struct wpabuf *msg, const u8 *addr)
496 {
497 wpa_printf(MSG_DEBUG, "WPS: * MAC Address (" MACSTR ")",
498 MAC2STR(addr));
499 wpabuf_put_be16(msg, ATTR_MAC_ADDR);
500 wpabuf_put_be16(msg, ETH_ALEN);
501 wpabuf_put_data(msg, addr, ETH_ALEN);
502 return 0;
503 }
504
505
wps_build_rf_bands_attr(struct wpabuf * msg,u8 rf_bands)506 int wps_build_rf_bands_attr(struct wpabuf *msg, u8 rf_bands)
507 {
508 wpa_printf(MSG_DEBUG, "WPS: * RF Bands (%x)", rf_bands);
509 wpabuf_put_be16(msg, ATTR_RF_BANDS);
510 wpabuf_put_be16(msg, 1);
511 wpabuf_put_u8(msg, rf_bands);
512 return 0;
513 }
514
515
wps_build_ap_channel(struct wpabuf * msg,u16 ap_channel)516 int wps_build_ap_channel(struct wpabuf *msg, u16 ap_channel)
517 {
518 wpa_printf(MSG_DEBUG, "WPS: * AP Channel (%u)", ap_channel);
519 wpabuf_put_be16(msg, ATTR_AP_CHANNEL);
520 wpabuf_put_be16(msg, 2);
521 wpabuf_put_be16(msg, ap_channel);
522 return 0;
523 }
524