1 /*
2 * P2P - IE parser
3 * Copyright (c) 2009-2010, Atheros Communications
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 "common/ieee802_11_defs.h"
13 #include "common/ieee802_11_common.h"
14 #include "wps/wps_i.h"
15 #include "p2p_i.h"
16
17
p2p_copy_filter_devname(char * dst,size_t dst_len,const void * src,size_t src_len)18 void p2p_copy_filter_devname(char *dst, size_t dst_len,
19 const void *src, size_t src_len)
20 {
21 size_t i;
22
23 if (src_len >= dst_len)
24 src_len = dst_len - 1;
25 os_memcpy(dst, src, src_len);
26 dst[src_len] = '\0';
27 for (i = 0; i < src_len; i++) {
28 if (dst[i] == '\0')
29 break;
30 if (is_ctrl_char(dst[i]))
31 dst[i] = '_';
32 }
33 }
34
35
p2p_parse_attribute(u8 id,const u8 * data,u16 len,struct p2p_message * msg)36 static int p2p_parse_attribute(u8 id, const u8 *data, u16 len,
37 struct p2p_message *msg)
38 {
39 const u8 *pos;
40 u16 nlen;
41 char devtype[WPS_DEV_TYPE_BUFSIZE];
42
43 switch (id) {
44 case P2P_ATTR_CAPABILITY:
45 if (len < 2) {
46 wpa_printf(MSG_DEBUG, "P2P: Too short Capability "
47 "attribute (length %d)", len);
48 return -1;
49 }
50 msg->capability = data;
51 wpa_printf(MSG_DEBUG, "P2P: * Device Capability %02x "
52 "Group Capability %02x",
53 data[0], data[1]);
54 break;
55 case P2P_ATTR_DEVICE_ID:
56 if (len < ETH_ALEN) {
57 wpa_printf(MSG_DEBUG, "P2P: Too short Device ID "
58 "attribute (length %d)", len);
59 return -1;
60 }
61 msg->device_id = data;
62 wpa_printf(MSG_DEBUG, "P2P: * Device ID " MACSTR,
63 MAC2STR(msg->device_id));
64 break;
65 case P2P_ATTR_GROUP_OWNER_INTENT:
66 if (len < 1) {
67 wpa_printf(MSG_DEBUG, "P2P: Too short GO Intent "
68 "attribute (length %d)", len);
69 return -1;
70 }
71 msg->go_intent = data;
72 wpa_printf(MSG_DEBUG, "P2P: * GO Intent: Intent %u "
73 "Tie breaker %u", data[0] >> 1, data[0] & 0x01);
74 break;
75 case P2P_ATTR_STATUS:
76 if (len < 1) {
77 wpa_printf(MSG_DEBUG, "P2P: Too short Status "
78 "attribute (length %d)", len);
79 return -1;
80 }
81 msg->status = data;
82 wpa_printf(MSG_DEBUG, "P2P: * Status: %d", data[0]);
83 break;
84 case P2P_ATTR_LISTEN_CHANNEL:
85 if (len == 0) {
86 wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: Ignore "
87 "null channel");
88 break;
89 }
90 if (len < 5) {
91 wpa_printf(MSG_DEBUG, "P2P: Too short Listen Channel "
92 "attribute (length %d)", len);
93 return -1;
94 }
95 msg->listen_channel = data;
96 if (has_ctrl_char(data, 2)) {
97 wpa_printf(MSG_DEBUG,
98 "P2P: * Listen Channel: Country(binary) %02x %02x (0x%02x) Regulatory Class %d Channel Number %d",
99 data[0], data[1], data[2], data[3], data[4]);
100 break;
101 }
102 wpa_printf(MSG_DEBUG, "P2P: * Listen Channel: "
103 "Country %c%c(0x%02x) Regulatory "
104 "Class %d Channel Number %d", data[0], data[1],
105 data[2], data[3], data[4]);
106 break;
107 case P2P_ATTR_OPERATING_CHANNEL:
108 if (len == 0) {
109 wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: "
110 "Ignore null channel");
111 break;
112 }
113 if (len < 5) {
114 wpa_printf(MSG_DEBUG, "P2P: Too short Operating "
115 "Channel attribute (length %d)", len);
116 return -1;
117 }
118 msg->operating_channel = data;
119 if (has_ctrl_char(data, 2)) {
120 wpa_printf(MSG_DEBUG,
121 "P2P: * Operating Channel: Country(binary) %02x %02x (0x%02x) Regulatory Class %d Channel Number %d",
122 data[0], data[1], data[2], data[3], data[4]);
123 break;
124 }
125 wpa_printf(MSG_DEBUG, "P2P: * Operating Channel: "
126 "Country %c%c(0x%02x) Regulatory "
127 "Class %d Channel Number %d", data[0], data[1],
128 data[2], data[3], data[4]);
129 break;
130 case P2P_ATTR_CHANNEL_LIST:
131 if (len < 3) {
132 wpa_printf(MSG_DEBUG, "P2P: Too short Channel List "
133 "attribute (length %d)", len);
134 return -1;
135 }
136 msg->channel_list = data;
137 msg->channel_list_len = len;
138 if (has_ctrl_char(data, 2)) {
139 wpa_printf(MSG_DEBUG,
140 "P2P: * Channel List: Country String (binary) %02x %02x (0x%02x)",
141 data[0], data[1], data[2]);
142 } else {
143 wpa_printf(MSG_DEBUG,
144 "P2P: * Channel List: Country String '%c%c(0x%02x)'",
145 data[0], data[1], data[2]);
146 }
147 wpa_hexdump(MSG_MSGDUMP, "P2P: Channel List",
148 msg->channel_list, msg->channel_list_len);
149 break;
150 case P2P_ATTR_GROUP_INFO:
151 msg->group_info = data;
152 msg->group_info_len = len;
153 wpa_printf(MSG_DEBUG, "P2P: * Group Info");
154 break;
155 case P2P_ATTR_DEVICE_INFO:
156 if (len < ETH_ALEN + 2 + 8 + 1) {
157 wpa_printf(MSG_DEBUG, "P2P: Too short Device Info "
158 "attribute (length %d)", len);
159 return -1;
160 }
161 msg->p2p_device_info = data;
162 msg->p2p_device_info_len = len;
163 pos = data;
164 msg->p2p_device_addr = pos;
165 pos += ETH_ALEN;
166 msg->config_methods = WPA_GET_BE16(pos);
167 pos += 2;
168 msg->pri_dev_type = pos;
169 pos += 8;
170 msg->num_sec_dev_types = *pos++;
171 if (msg->num_sec_dev_types * 8 > data + len - pos) {
172 wpa_printf(MSG_DEBUG, "P2P: Device Info underflow");
173 return -1;
174 }
175 pos += msg->num_sec_dev_types * 8;
176 if (data + len - pos < 4) {
177 wpa_printf(MSG_DEBUG, "P2P: Invalid Device Name "
178 "length %d", (int) (data + len - pos));
179 return -1;
180 }
181 if (WPA_GET_BE16(pos) != ATTR_DEV_NAME) {
182 wpa_hexdump(MSG_DEBUG, "P2P: Unexpected Device Name "
183 "header", pos, 4);
184 return -1;
185 }
186 pos += 2;
187 nlen = WPA_GET_BE16(pos);
188 pos += 2;
189 if (nlen > data + len - pos || nlen > WPS_DEV_NAME_MAX_LEN) {
190 wpa_printf(MSG_DEBUG, "P2P: Invalid Device Name "
191 "length %u (buf len %d)", nlen,
192 (int) (data + len - pos));
193 return -1;
194 }
195 p2p_copy_filter_devname(msg->device_name,
196 sizeof(msg->device_name), pos, nlen);
197 wpa_printf(MSG_DEBUG, "P2P: * Device Info: addr " MACSTR
198 " primary device type %s device name '%s' "
199 "config methods 0x%x",
200 MAC2STR(msg->p2p_device_addr),
201 wps_dev_type_bin2str(msg->pri_dev_type, devtype,
202 sizeof(devtype)),
203 msg->device_name, msg->config_methods);
204 break;
205 case P2P_ATTR_CONFIGURATION_TIMEOUT:
206 if (len < 2) {
207 wpa_printf(MSG_DEBUG, "P2P: Too short Configuration "
208 "Timeout attribute (length %d)", len);
209 return -1;
210 }
211 msg->config_timeout = data;
212 wpa_printf(MSG_DEBUG, "P2P: * Configuration Timeout");
213 break;
214 case P2P_ATTR_INTENDED_INTERFACE_ADDR:
215 if (len < ETH_ALEN) {
216 wpa_printf(MSG_DEBUG, "P2P: Too short Intended P2P "
217 "Interface Address attribute (length %d)",
218 len);
219 return -1;
220 }
221 msg->intended_addr = data;
222 wpa_printf(MSG_DEBUG, "P2P: * Intended P2P Interface Address: "
223 MACSTR, MAC2STR(msg->intended_addr));
224 break;
225 case P2P_ATTR_GROUP_BSSID:
226 if (len < ETH_ALEN) {
227 wpa_printf(MSG_DEBUG, "P2P: Too short P2P Group BSSID "
228 "attribute (length %d)", len);
229 return -1;
230 }
231 msg->group_bssid = data;
232 wpa_printf(MSG_DEBUG, "P2P: * P2P Group BSSID: " MACSTR,
233 MAC2STR(msg->group_bssid));
234 break;
235 case P2P_ATTR_GROUP_ID:
236 if (len < ETH_ALEN || len > ETH_ALEN + SSID_MAX_LEN) {
237 wpa_printf(MSG_DEBUG, "P2P: Invalid P2P Group ID "
238 "attribute length %d", len);
239 return -1;
240 }
241 msg->group_id = data;
242 msg->group_id_len = len;
243 wpa_printf(MSG_DEBUG, "P2P: * P2P Group ID: Device Address "
244 MACSTR, MAC2STR(msg->group_id));
245 wpa_hexdump_ascii(MSG_DEBUG, "P2P: * P2P Group ID: SSID",
246 msg->group_id + ETH_ALEN,
247 msg->group_id_len - ETH_ALEN);
248 break;
249 case P2P_ATTR_INVITATION_FLAGS:
250 if (len < 1) {
251 wpa_printf(MSG_DEBUG, "P2P: Too short Invitation "
252 "Flag attribute (length %d)", len);
253 return -1;
254 }
255 msg->invitation_flags = data;
256 wpa_printf(MSG_DEBUG, "P2P: * Invitation Flags: bitmap 0x%x",
257 data[0]);
258 break;
259 case P2P_ATTR_MANAGEABILITY:
260 if (len < 1) {
261 wpa_printf(MSG_DEBUG, "P2P: Too short Manageability "
262 "attribute (length %d)", len);
263 return -1;
264 }
265 msg->manageability = data;
266 wpa_printf(MSG_DEBUG, "P2P: * Manageability: bitmap 0x%x",
267 data[0]);
268 break;
269 case P2P_ATTR_NOTICE_OF_ABSENCE:
270 if (len < 2) {
271 wpa_printf(MSG_DEBUG, "P2P: Too short Notice of "
272 "Absence attribute (length %d)", len);
273 return -1;
274 }
275 msg->noa = data;
276 msg->noa_len = len;
277 wpa_printf(MSG_DEBUG, "P2P: * Notice of Absence");
278 break;
279 case P2P_ATTR_EXT_LISTEN_TIMING:
280 if (len < 4) {
281 wpa_printf(MSG_DEBUG, "P2P: Too short Extended Listen "
282 "Timing attribute (length %d)", len);
283 return -1;
284 }
285 msg->ext_listen_timing = data;
286 wpa_printf(MSG_DEBUG, "P2P: * Extended Listen Timing "
287 "(period %u msec interval %u msec)",
288 WPA_GET_LE16(msg->ext_listen_timing),
289 WPA_GET_LE16(msg->ext_listen_timing + 2));
290 break;
291 case P2P_ATTR_MINOR_REASON_CODE:
292 if (len < 1) {
293 wpa_printf(MSG_DEBUG, "P2P: Too short Minor Reason "
294 "Code attribute (length %d)", len);
295 return -1;
296 }
297 msg->minor_reason_code = data;
298 wpa_printf(MSG_DEBUG, "P2P: * Minor Reason Code: %u",
299 *msg->minor_reason_code);
300 break;
301 case P2P_ATTR_OOB_GO_NEG_CHANNEL:
302 if (len < 6) {
303 wpa_printf(MSG_DEBUG, "P2P: Too short OOB GO Neg "
304 "Channel attribute (length %d)", len);
305 return -1;
306 }
307 msg->oob_go_neg_channel = data;
308 wpa_printf(MSG_DEBUG, "P2P: * OOB GO Neg Channel: "
309 "Country %c%c(0x%02x) Operating Class %d "
310 "Channel Number %d Role %d",
311 data[0], data[1], data[2], data[3], data[4],
312 data[5]);
313 break;
314 case P2P_ATTR_SERVICE_HASH:
315 if (len < P2PS_HASH_LEN) {
316 wpa_printf(MSG_DEBUG,
317 "P2P: Too short Service Hash (length %u)",
318 len);
319 return -1;
320 }
321 msg->service_hash_count = len / P2PS_HASH_LEN;
322 msg->service_hash = data;
323 wpa_hexdump(MSG_DEBUG, "P2P: * Service Hash(s)", data, len);
324 break;
325 case P2P_ATTR_SESSION_INFORMATION_DATA:
326 msg->session_info = data;
327 msg->session_info_len = len;
328 wpa_printf(MSG_DEBUG, "P2P: * Service Instance: %u bytes - %p",
329 len, data);
330 break;
331 case P2P_ATTR_CONNECTION_CAPABILITY:
332 if (len < 1) {
333 wpa_printf(MSG_DEBUG,
334 "P2P: Too short Connection Capability (length %u)",
335 len);
336 return -1;
337 }
338 msg->conn_cap = data;
339 wpa_printf(MSG_DEBUG, "P2P: * Connection Capability: 0x%x",
340 *msg->conn_cap);
341 break;
342 case P2P_ATTR_ADVERTISEMENT_ID:
343 if (len < 10) {
344 wpa_printf(MSG_DEBUG,
345 "P2P: Too short Advertisement ID (length %u)",
346 len);
347 return -1;
348 }
349 msg->adv_id = data;
350 msg->adv_mac = &data[sizeof(u32)];
351 wpa_printf(MSG_DEBUG, "P2P: * Advertisement ID %x",
352 WPA_GET_LE32(data));
353 break;
354 case P2P_ATTR_ADVERTISED_SERVICE:
355 if (len < 8) {
356 wpa_printf(MSG_DEBUG,
357 "P2P: Too short Service Instance (length %u)",
358 len);
359 return -1;
360 }
361 msg->adv_service_instance = data;
362 msg->adv_service_instance_len = len;
363 if (len <= 255 + 8) {
364 char str[256];
365 u8 namelen;
366
367 namelen = data[6];
368 if (namelen > len - 7)
369 break;
370 os_memcpy(str, &data[7], namelen);
371 str[namelen] = '\0';
372 wpa_printf(MSG_DEBUG, "P2P: * Service Instance: %x-%s",
373 WPA_GET_LE32(data), str);
374 } else {
375 wpa_printf(MSG_DEBUG, "P2P: * Service Instance: %p",
376 data);
377 }
378 break;
379 case P2P_ATTR_SESSION_ID:
380 if (len < sizeof(u32) + ETH_ALEN) {
381 wpa_printf(MSG_DEBUG,
382 "P2P: Too short Session ID Info (length %u)",
383 len);
384 return -1;
385 }
386 msg->session_id = data;
387 msg->session_mac = &data[sizeof(u32)];
388 wpa_printf(MSG_DEBUG, "P2P: * Session ID: %x " MACSTR,
389 WPA_GET_LE32(data), MAC2STR(msg->session_mac));
390 break;
391 case P2P_ATTR_FEATURE_CAPABILITY:
392 if (!len) {
393 wpa_printf(MSG_DEBUG,
394 "P2P: Too short Feature Capability (length %u)",
395 len);
396 return -1;
397 }
398 msg->feature_cap = data;
399 msg->feature_cap_len = len;
400 wpa_printf(MSG_DEBUG, "P2P: * Feature Cap (length=%u)", len);
401 break;
402 case P2P_ATTR_PERSISTENT_GROUP:
403 {
404 if (len < ETH_ALEN || len > ETH_ALEN + SSID_MAX_LEN) {
405 wpa_printf(MSG_DEBUG,
406 "P2P: Invalid Persistent Group Info (length %u)",
407 len);
408 return -1;
409 }
410
411 msg->persistent_dev = data;
412 msg->persistent_ssid_len = len - ETH_ALEN;
413 msg->persistent_ssid = &data[ETH_ALEN];
414 wpa_printf(MSG_DEBUG, "P2P: * Persistent Group: " MACSTR " %s",
415 MAC2STR(msg->persistent_dev),
416 wpa_ssid_txt(msg->persistent_ssid,
417 msg->persistent_ssid_len));
418 break;
419 }
420 default:
421 wpa_printf(MSG_DEBUG, "P2P: Skipped unknown attribute %d "
422 "(length %d)", id, len);
423 break;
424 }
425
426 return 0;
427 }
428
429
430 /**
431 * p2p_parse_p2p_ie - Parse P2P IE
432 * @buf: Concatenated P2P IE(s) payload
433 * @msg: Buffer for returning parsed attributes
434 * Returns: 0 on success, -1 on failure
435 *
436 * Note: Caller is responsible for clearing the msg data structure before
437 * calling this function.
438 */
p2p_parse_p2p_ie(const struct wpabuf * buf,struct p2p_message * msg)439 int p2p_parse_p2p_ie(const struct wpabuf *buf, struct p2p_message *msg)
440 {
441 const u8 *pos = wpabuf_head_u8(buf);
442 const u8 *end = pos + wpabuf_len(buf);
443
444 wpa_printf(MSG_DEBUG, "P2P: Parsing P2P IE");
445
446 while (pos < end) {
447 u16 attr_len;
448 u8 id;
449
450 if (end - pos < 3) {
451 wpa_printf(MSG_DEBUG, "P2P: Invalid P2P attribute");
452 return -1;
453 }
454 id = *pos++;
455 attr_len = WPA_GET_LE16(pos);
456 pos += 2;
457 wpa_printf(MSG_DEBUG, "P2P: Attribute %d length %u",
458 id, attr_len);
459 if (attr_len > end - pos) {
460 wpa_printf(MSG_DEBUG, "P2P: Attribute underflow "
461 "(len=%u left=%d)",
462 attr_len, (int) (end - pos));
463 wpa_hexdump(MSG_MSGDUMP, "P2P: Data", pos, end - pos);
464 return -1;
465 }
466 if (p2p_parse_attribute(id, pos, attr_len, msg))
467 return -1;
468 pos += attr_len;
469 }
470
471 return 0;
472 }
473
474
p2p_parse_wps_ie(const struct wpabuf * buf,struct p2p_message * msg)475 static int p2p_parse_wps_ie(const struct wpabuf *buf, struct p2p_message *msg)
476 {
477 struct wps_parse_attr attr;
478 int i;
479
480 wpa_printf(MSG_DEBUG, "P2P: Parsing WPS IE");
481 if (wps_parse_msg(buf, &attr))
482 return -1;
483 if (attr.dev_name && attr.dev_name_len < sizeof(msg->device_name) &&
484 !msg->device_name[0])
485 os_memcpy(msg->device_name, attr.dev_name, attr.dev_name_len);
486 if (attr.config_methods) {
487 msg->wps_config_methods =
488 WPA_GET_BE16(attr.config_methods);
489 wpa_printf(MSG_DEBUG, "P2P: Config Methods (WPS): 0x%x",
490 msg->wps_config_methods);
491 }
492 if (attr.dev_password_id) {
493 msg->dev_password_id = WPA_GET_BE16(attr.dev_password_id);
494 wpa_printf(MSG_DEBUG, "P2P: Device Password ID: %d",
495 msg->dev_password_id);
496 msg->dev_password_id_present = 1;
497 }
498 if (attr.primary_dev_type) {
499 char devtype[WPS_DEV_TYPE_BUFSIZE];
500 msg->wps_pri_dev_type = attr.primary_dev_type;
501 wpa_printf(MSG_DEBUG, "P2P: Primary Device Type (WPS): %s",
502 wps_dev_type_bin2str(msg->wps_pri_dev_type, devtype,
503 sizeof(devtype)));
504 }
505 if (attr.sec_dev_type_list) {
506 msg->wps_sec_dev_type_list = attr.sec_dev_type_list;
507 msg->wps_sec_dev_type_list_len = attr.sec_dev_type_list_len;
508 }
509
510 for (i = 0; i < P2P_MAX_WPS_VENDOR_EXT; i++) {
511 msg->wps_vendor_ext[i] = attr.vendor_ext[i];
512 msg->wps_vendor_ext_len[i] = attr.vendor_ext_len[i];
513 }
514
515 msg->manufacturer = attr.manufacturer;
516 msg->manufacturer_len = attr.manufacturer_len;
517 msg->model_name = attr.model_name;
518 msg->model_name_len = attr.model_name_len;
519 msg->model_number = attr.model_number;
520 msg->model_number_len = attr.model_number_len;
521 msg->serial_number = attr.serial_number;
522 msg->serial_number_len = attr.serial_number_len;
523
524 msg->oob_dev_password = attr.oob_dev_password;
525 msg->oob_dev_password_len = attr.oob_dev_password_len;
526
527 return 0;
528 }
529
530
531 /**
532 * p2p_parse_ies - Parse P2P message IEs (both WPS and P2P IE)
533 * @data: IEs from the message
534 * @len: Length of data buffer in octets
535 * @msg: Buffer for returning parsed attributes
536 * Returns: 0 on success, -1 on failure
537 *
538 * Note: Caller is responsible for clearing the msg data structure before
539 * calling this function.
540 *
541 * Note: Caller must free temporary memory allocations by calling
542 * p2p_parse_free() when the parsed data is not needed anymore.
543 */
p2p_parse_ies(const u8 * data,size_t len,struct p2p_message * msg)544 int p2p_parse_ies(const u8 *data, size_t len, struct p2p_message *msg)
545 {
546 struct ieee802_11_elems elems;
547
548 if (ieee802_11_parse_elems(data, len, &elems, 0) == ParseFailed)
549 return -1;
550
551 if (elems.ds_params)
552 msg->ds_params = elems.ds_params;
553 if (elems.ssid)
554 msg->ssid = elems.ssid - 2;
555
556 msg->wps_attributes = ieee802_11_vendor_ie_concat(data, len,
557 WPS_DEV_OUI_WFA);
558 if (msg->wps_attributes &&
559 p2p_parse_wps_ie(msg->wps_attributes, msg)) {
560 p2p_parse_free(msg);
561 return -1;
562 }
563
564 msg->p2p_attributes = ieee802_11_vendor_ie_concat(data, len,
565 P2P_IE_VENDOR_TYPE);
566 if (msg->p2p_attributes &&
567 p2p_parse_p2p_ie(msg->p2p_attributes, msg)) {
568 wpa_printf(MSG_DEBUG, "P2P: Failed to parse P2P IE data");
569 if (msg->p2p_attributes)
570 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: P2P IE data",
571 msg->p2p_attributes);
572 p2p_parse_free(msg);
573 return -1;
574 }
575
576 #ifdef CONFIG_WIFI_DISPLAY
577 if (elems.wfd) {
578 msg->wfd_subelems = ieee802_11_vendor_ie_concat(
579 data, len, WFD_IE_VENDOR_TYPE);
580 }
581 #endif /* CONFIG_WIFI_DISPLAY */
582
583 msg->pref_freq_list = elems.pref_freq_list;
584 msg->pref_freq_list_len = elems.pref_freq_list_len;
585
586 return 0;
587 }
588
589
590 /**
591 * p2p_parse - Parse a P2P Action frame contents
592 * @data: Action frame payload after Category and Code fields
593 * @len: Length of data buffer in octets
594 * @msg: Buffer for returning parsed attributes
595 * Returns: 0 on success, -1 on failure
596 *
597 * Note: Caller must free temporary memory allocations by calling
598 * p2p_parse_free() when the parsed data is not needed anymore.
599 */
p2p_parse(const u8 * data,size_t len,struct p2p_message * msg)600 int p2p_parse(const u8 *data, size_t len, struct p2p_message *msg)
601 {
602 os_memset(msg, 0, sizeof(*msg));
603 wpa_printf(MSG_DEBUG, "P2P: Parsing the received message");
604 if (len < 1) {
605 wpa_printf(MSG_DEBUG, "P2P: No Dialog Token in the message");
606 return -1;
607 }
608 msg->dialog_token = data[0];
609 wpa_printf(MSG_DEBUG, "P2P: * Dialog Token: %d", msg->dialog_token);
610
611 return p2p_parse_ies(data + 1, len - 1, msg);
612 }
613
614
p2p_parse_ies_separate(const u8 * wsc,size_t wsc_len,const u8 * p2p,size_t p2p_len,struct p2p_message * msg)615 int p2p_parse_ies_separate(const u8 *wsc, size_t wsc_len, const u8 *p2p,
616 size_t p2p_len, struct p2p_message *msg)
617 {
618 os_memset(msg, 0, sizeof(*msg));
619
620 msg->wps_attributes = wpabuf_alloc_copy(wsc, wsc_len);
621 if (msg->wps_attributes &&
622 p2p_parse_wps_ie(msg->wps_attributes, msg)) {
623 p2p_parse_free(msg);
624 return -1;
625 }
626
627 msg->p2p_attributes = wpabuf_alloc_copy(p2p, p2p_len);
628 if (msg->p2p_attributes &&
629 p2p_parse_p2p_ie(msg->p2p_attributes, msg)) {
630 wpa_printf(MSG_DEBUG, "P2P: Failed to parse P2P IE data");
631 if (msg->p2p_attributes)
632 wpa_hexdump_buf(MSG_MSGDUMP, "P2P: P2P IE data",
633 msg->p2p_attributes);
634 p2p_parse_free(msg);
635 return -1;
636 }
637
638 return 0;
639 }
640
641
642 /**
643 * p2p_parse_free - Free temporary data from P2P parsing
644 * @msg: Parsed attributes
645 */
p2p_parse_free(struct p2p_message * msg)646 void p2p_parse_free(struct p2p_message *msg)
647 {
648 wpabuf_free(msg->p2p_attributes);
649 msg->p2p_attributes = NULL;
650 wpabuf_free(msg->wps_attributes);
651 msg->wps_attributes = NULL;
652 #ifdef CONFIG_WIFI_DISPLAY
653 wpabuf_free(msg->wfd_subelems);
654 msg->wfd_subelems = NULL;
655 #endif /* CONFIG_WIFI_DISPLAY */
656 }
657
658
p2p_group_info_parse(const u8 * gi,size_t gi_len,struct p2p_group_info * info)659 int p2p_group_info_parse(const u8 *gi, size_t gi_len,
660 struct p2p_group_info *info)
661 {
662 const u8 *g, *gend;
663
664 os_memset(info, 0, sizeof(*info));
665 if (gi == NULL)
666 return 0;
667
668 g = gi;
669 gend = gi + gi_len;
670 while (g < gend) {
671 struct p2p_client_info *cli;
672 const u8 *cend;
673 u16 count;
674 u8 len;
675
676 cli = &info->client[info->num_clients];
677 len = *g++;
678 if (len > gend - g || len < 2 * ETH_ALEN + 1 + 2 + 8 + 1)
679 return -1; /* invalid data */
680 cend = g + len;
681 /* g at start of P2P Client Info Descriptor */
682 cli->p2p_device_addr = g;
683 g += ETH_ALEN;
684 cli->p2p_interface_addr = g;
685 g += ETH_ALEN;
686 cli->dev_capab = *g++;
687
688 cli->config_methods = WPA_GET_BE16(g);
689 g += 2;
690 cli->pri_dev_type = g;
691 g += 8;
692
693 /* g at Number of Secondary Device Types */
694 len = *g++;
695 if (8 * len > cend - g)
696 return -1; /* invalid data */
697 cli->num_sec_dev_types = len;
698 cli->sec_dev_types = g;
699 g += 8 * len;
700
701 /* g at Device Name in WPS TLV format */
702 if (cend - g < 2 + 2)
703 return -1; /* invalid data */
704 if (WPA_GET_BE16(g) != ATTR_DEV_NAME)
705 return -1; /* invalid Device Name TLV */
706 g += 2;
707 count = WPA_GET_BE16(g);
708 g += 2;
709 if (count > cend - g)
710 return -1; /* invalid Device Name TLV */
711 if (count >= WPS_DEV_NAME_MAX_LEN)
712 count = WPS_DEV_NAME_MAX_LEN;
713 cli->dev_name = (const char *) g;
714 cli->dev_name_len = count;
715
716 g = cend;
717
718 info->num_clients++;
719 if (info->num_clients == P2P_MAX_GROUP_ENTRIES)
720 return -1;
721 }
722
723 return 0;
724 }
725
726
p2p_group_info_text(const u8 * gi,size_t gi_len,char * buf,char * end)727 static int p2p_group_info_text(const u8 *gi, size_t gi_len, char *buf,
728 char *end)
729 {
730 char *pos = buf;
731 int ret;
732 struct p2p_group_info info;
733 unsigned int i;
734
735 if (p2p_group_info_parse(gi, gi_len, &info) < 0)
736 return 0;
737
738 for (i = 0; i < info.num_clients; i++) {
739 struct p2p_client_info *cli;
740 char name[WPS_DEV_NAME_MAX_LEN + 1];
741 char devtype[WPS_DEV_TYPE_BUFSIZE];
742 u8 s;
743 int count;
744
745 cli = &info.client[i];
746 ret = os_snprintf(pos, end - pos, "p2p_group_client: "
747 "dev=" MACSTR " iface=" MACSTR,
748 MAC2STR(cli->p2p_device_addr),
749 MAC2STR(cli->p2p_interface_addr));
750 if (os_snprintf_error(end - pos, ret))
751 return pos - buf;
752 pos += ret;
753
754 ret = os_snprintf(pos, end - pos,
755 " dev_capab=0x%x config_methods=0x%x "
756 "dev_type=%s",
757 cli->dev_capab, cli->config_methods,
758 wps_dev_type_bin2str(cli->pri_dev_type,
759 devtype,
760 sizeof(devtype)));
761 if (os_snprintf_error(end - pos, ret))
762 return pos - buf;
763 pos += ret;
764
765 for (s = 0; s < cli->num_sec_dev_types; s++) {
766 ret = os_snprintf(pos, end - pos, " dev_type=%s",
767 wps_dev_type_bin2str(
768 &cli->sec_dev_types[s * 8],
769 devtype, sizeof(devtype)));
770 if (os_snprintf_error(end - pos, ret))
771 return pos - buf;
772 pos += ret;
773 }
774
775 os_memcpy(name, cli->dev_name, cli->dev_name_len);
776 name[cli->dev_name_len] = '\0';
777 count = (int) cli->dev_name_len - 1;
778 while (count >= 0) {
779 if (is_ctrl_char(name[count]))
780 name[count] = '_';
781 count--;
782 }
783
784 ret = os_snprintf(pos, end - pos, " dev_name='%s'\n", name);
785 if (os_snprintf_error(end - pos, ret))
786 return pos - buf;
787 pos += ret;
788 }
789
790 return pos - buf;
791 }
792
793
794 /**
795 * p2p_attr_text - Build text format description of P2P IE attributes
796 * @data: P2P IE contents
797 * @buf: Buffer for returning text
798 * @end: Pointer to the end of the buf area
799 * Returns: Number of octets written to the buffer or -1 on faikure
800 *
801 * This function can be used to parse P2P IE contents into text format
802 * field=value lines.
803 */
p2p_attr_text(struct wpabuf * data,char * buf,char * end)804 int p2p_attr_text(struct wpabuf *data, char *buf, char *end)
805 {
806 struct p2p_message msg;
807 char *pos = buf;
808 int ret;
809
810 os_memset(&msg, 0, sizeof(msg));
811 if (p2p_parse_p2p_ie(data, &msg))
812 return -1;
813
814 if (msg.capability) {
815 ret = os_snprintf(pos, end - pos,
816 "p2p_dev_capab=0x%x\n"
817 "p2p_group_capab=0x%x\n",
818 msg.capability[0], msg.capability[1]);
819 if (os_snprintf_error(end - pos, ret))
820 return pos - buf;
821 pos += ret;
822 }
823
824 if (msg.pri_dev_type) {
825 char devtype[WPS_DEV_TYPE_BUFSIZE];
826 ret = os_snprintf(pos, end - pos,
827 "p2p_primary_device_type=%s\n",
828 wps_dev_type_bin2str(msg.pri_dev_type,
829 devtype,
830 sizeof(devtype)));
831 if (os_snprintf_error(end - pos, ret))
832 return pos - buf;
833 pos += ret;
834 }
835
836 ret = os_snprintf(pos, end - pos, "p2p_device_name=%s\n",
837 msg.device_name);
838 if (os_snprintf_error(end - pos, ret))
839 return pos - buf;
840 pos += ret;
841
842 if (msg.p2p_device_addr) {
843 ret = os_snprintf(pos, end - pos, "p2p_device_addr=" MACSTR
844 "\n",
845 MAC2STR(msg.p2p_device_addr));
846 if (os_snprintf_error(end - pos, ret))
847 return pos - buf;
848 pos += ret;
849 }
850
851 ret = os_snprintf(pos, end - pos, "p2p_config_methods=0x%x\n",
852 msg.config_methods);
853 if (os_snprintf_error(end - pos, ret))
854 return pos - buf;
855 pos += ret;
856
857 ret = p2p_group_info_text(msg.group_info, msg.group_info_len,
858 pos, end);
859 if (ret < 0)
860 return pos - buf;
861 pos += ret;
862
863 return pos - buf;
864 }
865
866
p2p_get_cross_connect_disallowed(const struct wpabuf * p2p_ie)867 int p2p_get_cross_connect_disallowed(const struct wpabuf *p2p_ie)
868 {
869 struct p2p_message msg;
870
871 os_memset(&msg, 0, sizeof(msg));
872 if (p2p_parse_p2p_ie(p2p_ie, &msg))
873 return 0;
874
875 if (!msg.manageability)
876 return 0;
877
878 return !(msg.manageability[0] & P2P_MAN_CROSS_CONNECTION_PERMITTED);
879 }
880
881
p2p_get_group_capab(const struct wpabuf * p2p_ie)882 u8 p2p_get_group_capab(const struct wpabuf *p2p_ie)
883 {
884 struct p2p_message msg;
885
886 os_memset(&msg, 0, sizeof(msg));
887 if (p2p_parse_p2p_ie(p2p_ie, &msg))
888 return 0;
889
890 if (!msg.capability)
891 return 0;
892
893 return msg.capability[1];
894 }
895
896
p2p_get_go_dev_addr(const struct wpabuf * p2p_ie)897 const u8 * p2p_get_go_dev_addr(const struct wpabuf *p2p_ie)
898 {
899 struct p2p_message msg;
900
901 os_memset(&msg, 0, sizeof(msg));
902 if (p2p_parse_p2p_ie(p2p_ie, &msg))
903 return NULL;
904
905 if (msg.p2p_device_addr)
906 return msg.p2p_device_addr;
907 if (msg.device_id)
908 return msg.device_id;
909
910 return NULL;
911 }
912