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 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 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 */ 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 } 454 455 456 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 */ 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 */ 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 } 592 593 594 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 */ 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 } 636 637 638 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 } 704 705 706 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 */ 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 } 844 845 846 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 } 859 860 861 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 } 874 875 876 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
