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