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