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 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 */ 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 } 443 444 445 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 */ 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 */ 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 } 578 579 580 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 */ 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 } 622 623 624 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 } 691 692 693 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 */ 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 } 831 832 833 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 } 846 847 848 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 } 861 862 863 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
