1 /* 2 * Wi-Fi Direct - P2P service discovery 3 * Copyright (c) 2009, 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/gas.h" 14 #include "p2p_i.h" 15 #include "p2p.h" 16 17 18 #ifdef CONFIG_WIFI_DISPLAY 19 static int wfd_wsd_supported(struct wpabuf *wfd) 20 { 21 const u8 *pos, *end; 22 u8 subelem; 23 u16 len; 24 25 if (wfd == NULL) 26 return 0; 27 28 pos = wpabuf_head(wfd); 29 end = pos + wpabuf_len(wfd); 30 31 while (end - pos >= 3) { 32 subelem = *pos++; 33 len = WPA_GET_BE16(pos); 34 pos += 2; 35 if (len > end - pos) 36 break; 37 38 if (subelem == WFD_SUBELEM_DEVICE_INFO && len >= 6) { 39 u16 info = WPA_GET_BE16(pos); 40 return !!(info & 0x0040); 41 } 42 43 pos += len; 44 } 45 46 return 0; 47 } 48 #endif /* CONFIG_WIFI_DISPLAY */ 49 50 struct p2p_sd_query * p2p_pending_sd_req(struct p2p_data *p2p, 51 struct p2p_device *dev) 52 { 53 struct p2p_sd_query *q; 54 int wsd = 0; 55 int count = 0; 56 57 if (!(dev->info.dev_capab & P2P_DEV_CAPAB_SERVICE_DISCOVERY)) 58 return NULL; /* peer does not support SD */ 59 #ifdef CONFIG_WIFI_DISPLAY 60 if (wfd_wsd_supported(dev->info.wfd_subelems)) 61 wsd = 1; 62 #endif /* CONFIG_WIFI_DISPLAY */ 63 64 for (q = p2p->sd_queries; q; q = q->next) { 65 /* Use WSD only if the peer indicates support or it */ 66 if (q->wsd && !wsd) 67 continue; 68 /* if the query is a broadcast query */ 69 if (q->for_all_peers) { 70 /* 71 * check if there are any broadcast queries pending for 72 * this device 73 */ 74 if (dev->sd_pending_bcast_queries <= 0) 75 return NULL; 76 /* query number that needs to be send to the device */ 77 if (count == dev->sd_pending_bcast_queries - 1) 78 goto found; 79 count++; 80 } 81 if (!q->for_all_peers && 82 os_memcmp(q->peer, dev->info.p2p_device_addr, ETH_ALEN) == 83 0) 84 goto found; 85 } 86 87 return NULL; 88 89 found: 90 if (dev->sd_reqs > 100) { 91 p2p_dbg(p2p, "Too many SD request attempts to " MACSTR 92 " - skip remaining queries", 93 MAC2STR(dev->info.p2p_device_addr)); 94 return NULL; 95 } 96 return q; 97 } 98 99 100 static void p2p_decrease_sd_bc_queries(struct p2p_data *p2p, int query_number) 101 { 102 struct p2p_device *dev; 103 104 p2p->num_p2p_sd_queries--; 105 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) { 106 if (query_number <= dev->sd_pending_bcast_queries - 1) { 107 /* 108 * Query not yet sent to the device and it is to be 109 * removed, so update the pending count. 110 */ 111 dev->sd_pending_bcast_queries--; 112 } 113 } 114 } 115 116 117 static int p2p_unlink_sd_query(struct p2p_data *p2p, 118 struct p2p_sd_query *query) 119 { 120 struct p2p_sd_query *q, *prev; 121 int query_number = 0; 122 123 q = p2p->sd_queries; 124 prev = NULL; 125 while (q) { 126 if (q == query) { 127 /* If the query is a broadcast query, decrease one from 128 * all the devices */ 129 if (query->for_all_peers) 130 p2p_decrease_sd_bc_queries(p2p, query_number); 131 if (prev) 132 prev->next = q->next; 133 else 134 p2p->sd_queries = q->next; 135 if (p2p->sd_query == query) 136 p2p->sd_query = NULL; 137 return 1; 138 } 139 if (q->for_all_peers) 140 query_number++; 141 prev = q; 142 q = q->next; 143 } 144 return 0; 145 } 146 147 148 static void p2p_free_sd_query(struct p2p_sd_query *q) 149 { 150 if (q == NULL) 151 return; 152 wpabuf_free(q->tlvs); 153 os_free(q); 154 } 155 156 157 void p2p_free_sd_queries(struct p2p_data *p2p) 158 { 159 struct p2p_sd_query *q, *prev; 160 q = p2p->sd_queries; 161 p2p->sd_queries = NULL; 162 while (q) { 163 prev = q; 164 q = q->next; 165 p2p_free_sd_query(prev); 166 } 167 p2p->num_p2p_sd_queries = 0; 168 } 169 170 171 static struct wpabuf * p2p_build_sd_query(u16 update_indic, 172 struct wpabuf *tlvs) 173 { 174 struct wpabuf *buf; 175 u8 *len_pos; 176 177 buf = gas_anqp_build_initial_req(0, 100 + wpabuf_len(tlvs)); 178 if (buf == NULL) 179 return NULL; 180 181 /* ANQP Query Request Frame */ 182 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC); 183 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE); 184 wpabuf_put_le16(buf, update_indic); /* Service Update Indicator */ 185 wpabuf_put_buf(buf, tlvs); 186 gas_anqp_set_element_len(buf, len_pos); 187 188 gas_anqp_set_len(buf); 189 190 return buf; 191 } 192 193 194 static void p2p_send_gas_comeback_req(struct p2p_data *p2p, const u8 *dst, 195 u8 dialog_token, int freq) 196 { 197 struct wpabuf *req; 198 199 req = gas_build_comeback_req(dialog_token); 200 if (req == NULL) 201 return; 202 203 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 204 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, dst, 205 wpabuf_head(req), wpabuf_len(req), 200) < 0) 206 p2p_dbg(p2p, "Failed to send Action frame"); 207 208 wpabuf_free(req); 209 } 210 211 212 static struct wpabuf * p2p_build_sd_response(u8 dialog_token, u16 status_code, 213 u16 comeback_delay, 214 u16 update_indic, 215 const struct wpabuf *tlvs) 216 { 217 struct wpabuf *buf; 218 u8 *len_pos; 219 220 buf = gas_anqp_build_initial_resp(dialog_token, status_code, 221 comeback_delay, 222 100 + (tlvs ? wpabuf_len(tlvs) : 0)); 223 if (buf == NULL) 224 return NULL; 225 226 if (tlvs) { 227 /* ANQP Query Response Frame */ 228 len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC); 229 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE); 230 /* Service Update Indicator */ 231 wpabuf_put_le16(buf, update_indic); 232 wpabuf_put_buf(buf, tlvs); 233 gas_anqp_set_element_len(buf, len_pos); 234 } 235 236 gas_anqp_set_len(buf); 237 238 return buf; 239 } 240 241 242 static struct wpabuf * p2p_build_gas_comeback_resp(u8 dialog_token, 243 u16 status_code, 244 u16 update_indic, 245 const u8 *data, size_t len, 246 u8 frag_id, u8 more, 247 u16 total_len) 248 { 249 struct wpabuf *buf; 250 251 buf = gas_anqp_build_comeback_resp(dialog_token, status_code, frag_id, 252 more, 0, 100 + len); 253 if (buf == NULL) 254 return NULL; 255 256 if (frag_id == 0) { 257 /* ANQP Query Response Frame */ 258 wpabuf_put_le16(buf, ANQP_VENDOR_SPECIFIC); /* Info ID */ 259 wpabuf_put_le16(buf, 3 + 1 + 2 + total_len); 260 wpabuf_put_be32(buf, P2P_IE_VENDOR_TYPE); 261 /* Service Update Indicator */ 262 wpabuf_put_le16(buf, update_indic); 263 } 264 265 wpabuf_put_data(buf, data, len); 266 gas_anqp_set_len(buf); 267 268 return buf; 269 } 270 271 272 int p2p_start_sd(struct p2p_data *p2p, struct p2p_device *dev) 273 { 274 struct wpabuf *req; 275 int ret = 0; 276 struct p2p_sd_query *query; 277 int freq; 278 unsigned int wait_time; 279 280 freq = dev->listen_freq > 0 ? dev->listen_freq : dev->oper_freq; 281 if (freq <= 0) { 282 p2p_dbg(p2p, "No Listen/Operating frequency known for the peer " 283 MACSTR " to send SD Request", 284 MAC2STR(dev->info.p2p_device_addr)); 285 return -1; 286 } 287 288 query = p2p_pending_sd_req(p2p, dev); 289 if (query == NULL) 290 return -1; 291 if (p2p->state == P2P_SEARCH && 292 os_memcmp(p2p->sd_query_no_ack, dev->info.p2p_device_addr, 293 ETH_ALEN) == 0) { 294 p2p_dbg(p2p, "Do not start Service Discovery with " MACSTR 295 " due to it being the first no-ACK peer in this search iteration", 296 MAC2STR(dev->info.p2p_device_addr)); 297 return -2; 298 } 299 300 p2p_dbg(p2p, "Start Service Discovery with " MACSTR, 301 MAC2STR(dev->info.p2p_device_addr)); 302 303 req = p2p_build_sd_query(p2p->srv_update_indic, query->tlvs); 304 if (req == NULL) 305 return -1; 306 307 dev->sd_reqs++; 308 p2p->sd_peer = dev; 309 p2p->sd_query = query; 310 p2p->pending_action_state = P2P_PENDING_SD; 311 312 wait_time = 5000; 313 if (p2p->cfg->max_listen && wait_time > p2p->cfg->max_listen) 314 wait_time = p2p->cfg->max_listen; 315 if (p2p_send_action(p2p, freq, dev->info.p2p_device_addr, 316 p2p->cfg->dev_addr, dev->info.p2p_device_addr, 317 wpabuf_head(req), wpabuf_len(req), wait_time) < 0) { 318 p2p_dbg(p2p, "Failed to send Action frame"); 319 ret = -1; 320 } 321 322 wpabuf_free(req); 323 324 return ret; 325 } 326 327 328 void p2p_rx_gas_initial_req(struct p2p_data *p2p, const u8 *sa, 329 const u8 *data, size_t len, int rx_freq) 330 { 331 const u8 *pos = data; 332 const u8 *end = data + len; 333 const u8 *next; 334 u8 dialog_token; 335 u16 slen; 336 int freq; 337 u16 update_indic; 338 339 340 if (p2p->cfg->sd_request == NULL) 341 return; 342 343 if (rx_freq > 0) 344 freq = rx_freq; 345 else 346 freq = p2p_channel_to_freq(p2p->cfg->reg_class, 347 p2p->cfg->channel); 348 if (freq < 0) 349 return; 350 351 if (len < 1 + 2) 352 return; 353 354 dialog_token = *pos++; 355 p2p_dbg(p2p, "GAS Initial Request from " MACSTR 356 " (dialog token %u, freq %d)", 357 MAC2STR(sa), dialog_token, rx_freq); 358 359 if (*pos != WLAN_EID_ADV_PROTO) { 360 p2p_dbg(p2p, "Unexpected IE in GAS Initial Request: %u", *pos); 361 return; 362 } 363 pos++; 364 365 slen = *pos++; 366 if (slen > end - pos || slen < 2) { 367 p2p_dbg(p2p, "Invalid IE in GAS Initial Request"); 368 return; 369 } 370 next = pos + slen; 371 pos++; /* skip QueryRespLenLimit and PAME-BI */ 372 373 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) { 374 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u", 375 *pos); 376 return; 377 } 378 379 pos = next; 380 /* Query Request */ 381 if (end - pos < 2) 382 return; 383 slen = WPA_GET_LE16(pos); 384 pos += 2; 385 if (slen > end - pos) 386 return; 387 end = pos + slen; 388 389 /* ANQP Query Request */ 390 if (end - pos < 4) 391 return; 392 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) { 393 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos)); 394 return; 395 } 396 pos += 2; 397 398 slen = WPA_GET_LE16(pos); 399 pos += 2; 400 if (slen > end - pos || slen < 3 + 1) { 401 p2p_dbg(p2p, "Invalid ANQP Query Request length"); 402 return; 403 } 404 405 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) { 406 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x", 407 WPA_GET_BE32(pos)); 408 return; 409 } 410 pos += 4; 411 412 if (end - pos < 2) 413 return; 414 update_indic = WPA_GET_LE16(pos); 415 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic); 416 pos += 2; 417 418 p2p->cfg->sd_request(p2p->cfg->cb_ctx, freq, sa, dialog_token, 419 update_indic, pos, end - pos); 420 /* the response will be indicated with a call to p2p_sd_response() */ 421 } 422 423 424 void p2p_sd_response(struct p2p_data *p2p, int freq, const u8 *dst, 425 u8 dialog_token, const struct wpabuf *resp_tlvs) 426 { 427 struct wpabuf *resp; 428 size_t max_len; 429 430 /* 431 * In the 60 GHz, we have a smaller maximum frame length for management 432 * frames. 433 */ 434 max_len = (freq > 56160) ? 928 : 1400; 435 436 /* TODO: fix the length limit to match with the maximum frame length */ 437 if (wpabuf_len(resp_tlvs) > max_len) { 438 p2p_dbg(p2p, "SD response long enough to require fragmentation"); 439 if (p2p->sd_resp) { 440 /* 441 * TODO: Could consider storing the fragmented response 442 * separately for each peer to avoid having to drop old 443 * one if there is more than one pending SD query. 444 * Though, that would eat more memory, so there are 445 * also benefits to just using a single buffer. 446 */ 447 p2p_dbg(p2p, "Drop previous SD response"); 448 wpabuf_free(p2p->sd_resp); 449 } 450 p2p->sd_resp = wpabuf_dup(resp_tlvs); 451 if (p2p->sd_resp == NULL) { 452 p2p_err(p2p, "Failed to allocate SD response fragmentation area"); 453 return; 454 } 455 os_memcpy(p2p->sd_resp_addr, dst, ETH_ALEN); 456 p2p->sd_resp_dialog_token = dialog_token; 457 p2p->sd_resp_pos = 0; 458 p2p->sd_frag_id = 0; 459 resp = p2p_build_sd_response(dialog_token, WLAN_STATUS_SUCCESS, 460 1, p2p->srv_update_indic, NULL); 461 } else { 462 p2p_dbg(p2p, "SD response fits in initial response"); 463 resp = p2p_build_sd_response(dialog_token, 464 WLAN_STATUS_SUCCESS, 0, 465 p2p->srv_update_indic, resp_tlvs); 466 } 467 if (resp == NULL) 468 return; 469 470 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 471 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, 472 p2p->cfg->dev_addr, 473 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) 474 p2p_dbg(p2p, "Failed to send Action frame"); 475 476 wpabuf_free(resp); 477 } 478 479 480 void p2p_rx_gas_initial_resp(struct p2p_data *p2p, const u8 *sa, 481 const u8 *data, size_t len, int rx_freq) 482 { 483 const u8 *pos = data; 484 const u8 *end = data + len; 485 const u8 *next; 486 u8 dialog_token; 487 u16 status_code; 488 u16 comeback_delay; 489 u16 slen; 490 u16 update_indic; 491 492 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL || 493 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) { 494 p2p_dbg(p2p, "Ignore unexpected GAS Initial Response from " 495 MACSTR, MAC2STR(sa)); 496 return; 497 } 498 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 499 p2p_clear_timeout(p2p); 500 501 p2p_dbg(p2p, "Received GAS Initial Response from " MACSTR " (len=%d)", 502 MAC2STR(sa), (int) len); 503 504 if (len < 5 + 2) { 505 p2p_dbg(p2p, "Too short GAS Initial Response frame"); 506 return; 507 } 508 509 dialog_token = *pos++; 510 /* TODO: check dialog_token match */ 511 status_code = WPA_GET_LE16(pos); 512 pos += 2; 513 comeback_delay = WPA_GET_LE16(pos); 514 pos += 2; 515 p2p_dbg(p2p, "dialog_token=%u status_code=%u comeback_delay=%u", 516 dialog_token, status_code, comeback_delay); 517 if (status_code) { 518 p2p_dbg(p2p, "Service Discovery failed: status code %u", 519 status_code); 520 return; 521 } 522 523 if (*pos != WLAN_EID_ADV_PROTO) { 524 p2p_dbg(p2p, "Unexpected IE in GAS Initial Response: %u", *pos); 525 return; 526 } 527 pos++; 528 529 slen = *pos++; 530 if (slen > end - pos || slen < 2) { 531 p2p_dbg(p2p, "Invalid IE in GAS Initial Response"); 532 return; 533 } 534 next = pos + slen; 535 pos++; /* skip QueryRespLenLimit and PAME-BI */ 536 537 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) { 538 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u", 539 *pos); 540 return; 541 } 542 543 pos = next; 544 /* Query Response */ 545 if (end - pos < 2) { 546 p2p_dbg(p2p, "Too short Query Response"); 547 return; 548 } 549 slen = WPA_GET_LE16(pos); 550 pos += 2; 551 p2p_dbg(p2p, "Query Response Length: %d", slen); 552 if (slen > end - pos) { 553 p2p_dbg(p2p, "Not enough Query Response data"); 554 return; 555 } 556 end = pos + slen; 557 558 if (comeback_delay) { 559 p2p_dbg(p2p, "Fragmented response - request fragments"); 560 if (p2p->sd_rx_resp) { 561 p2p_dbg(p2p, "Drop old SD reassembly buffer"); 562 wpabuf_free(p2p->sd_rx_resp); 563 p2p->sd_rx_resp = NULL; 564 } 565 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq); 566 return; 567 } 568 569 /* ANQP Query Response */ 570 if (end - pos < 4) 571 return; 572 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) { 573 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos)); 574 return; 575 } 576 pos += 2; 577 578 slen = WPA_GET_LE16(pos); 579 pos += 2; 580 if (slen > end - pos || slen < 3 + 1) { 581 p2p_dbg(p2p, "Invalid ANQP Query Response length"); 582 return; 583 } 584 585 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) { 586 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x", 587 WPA_GET_BE32(pos)); 588 return; 589 } 590 pos += 4; 591 592 if (end - pos < 2) 593 return; 594 update_indic = WPA_GET_LE16(pos); 595 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic); 596 pos += 2; 597 598 p2p->sd_peer = NULL; 599 600 if (p2p->sd_query) { 601 if (!p2p->sd_query->for_all_peers) { 602 struct p2p_sd_query *q; 603 p2p_dbg(p2p, "Remove completed SD query %p", 604 p2p->sd_query); 605 q = p2p->sd_query; 606 p2p_unlink_sd_query(p2p, p2p->sd_query); 607 p2p_free_sd_query(q); 608 } 609 p2p->sd_query = NULL; 610 } 611 612 if (p2p->cfg->sd_response) 613 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, update_indic, 614 pos, end - pos); 615 p2p_continue_find(p2p); 616 } 617 618 619 void p2p_rx_gas_comeback_req(struct p2p_data *p2p, const u8 *sa, 620 const u8 *data, size_t len, int rx_freq) 621 { 622 struct wpabuf *resp; 623 u8 dialog_token; 624 size_t frag_len, max_len; 625 int more = 0; 626 627 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Request", data, len); 628 if (len < 1) 629 return; 630 dialog_token = *data; 631 p2p_dbg(p2p, "Dialog Token: %u", dialog_token); 632 if (dialog_token != p2p->sd_resp_dialog_token) { 633 p2p_dbg(p2p, "No pending SD response fragment for dialog token %u", 634 dialog_token); 635 return; 636 } 637 638 if (p2p->sd_resp == NULL) { 639 p2p_dbg(p2p, "No pending SD response fragment available"); 640 return; 641 } 642 if (os_memcmp(sa, p2p->sd_resp_addr, ETH_ALEN) != 0) { 643 p2p_dbg(p2p, "No pending SD response fragment for " MACSTR, 644 MAC2STR(sa)); 645 return; 646 } 647 648 /* 649 * In the 60 GHz, we have a smaller maximum frame length for management 650 * frames. 651 */ 652 max_len = (rx_freq > 56160) ? 928 : 1400; 653 frag_len = wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos; 654 if (frag_len > max_len) { 655 frag_len = max_len; 656 more = 1; 657 } 658 resp = p2p_build_gas_comeback_resp(dialog_token, WLAN_STATUS_SUCCESS, 659 p2p->srv_update_indic, 660 wpabuf_head_u8(p2p->sd_resp) + 661 p2p->sd_resp_pos, frag_len, 662 p2p->sd_frag_id, more, 663 wpabuf_len(p2p->sd_resp)); 664 if (resp == NULL) 665 return; 666 p2p_dbg(p2p, "Send GAS Comeback Response (frag_id %d more=%d frag_len=%d)", 667 p2p->sd_frag_id, more, (int) frag_len); 668 p2p->sd_frag_id++; 669 p2p->sd_resp_pos += frag_len; 670 671 if (more) { 672 p2p_dbg(p2p, "%d more bytes remain to be sent", 673 (int) (wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos)); 674 } else { 675 p2p_dbg(p2p, "All fragments of SD response sent"); 676 wpabuf_free(p2p->sd_resp); 677 p2p->sd_resp = NULL; 678 } 679 680 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 681 if (p2p_send_action(p2p, rx_freq, sa, p2p->cfg->dev_addr, 682 p2p->cfg->dev_addr, 683 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) 684 p2p_dbg(p2p, "Failed to send Action frame"); 685 686 wpabuf_free(resp); 687 } 688 689 690 void p2p_rx_gas_comeback_resp(struct p2p_data *p2p, const u8 *sa, 691 const u8 *data, size_t len, int rx_freq) 692 { 693 const u8 *pos = data; 694 const u8 *end = data + len; 695 const u8 *next; 696 u8 dialog_token; 697 u16 status_code; 698 u8 frag_id; 699 u8 more_frags; 700 u16 comeback_delay; 701 u16 slen; 702 703 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Response", data, len); 704 705 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL || 706 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) { 707 p2p_dbg(p2p, "Ignore unexpected GAS Comeback Response from " 708 MACSTR, MAC2STR(sa)); 709 return; 710 } 711 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 712 p2p_clear_timeout(p2p); 713 714 p2p_dbg(p2p, "Received GAS Comeback Response from " MACSTR " (len=%d)", 715 MAC2STR(sa), (int) len); 716 717 if (len < 6 + 2) { 718 p2p_dbg(p2p, "Too short GAS Comeback Response frame"); 719 return; 720 } 721 722 dialog_token = *pos++; 723 /* TODO: check dialog_token match */ 724 status_code = WPA_GET_LE16(pos); 725 pos += 2; 726 frag_id = *pos & 0x7f; 727 more_frags = (*pos & 0x80) >> 7; 728 pos++; 729 comeback_delay = WPA_GET_LE16(pos); 730 pos += 2; 731 p2p_dbg(p2p, "dialog_token=%u status_code=%u frag_id=%d more_frags=%d " 732 "comeback_delay=%u", 733 dialog_token, status_code, frag_id, more_frags, 734 comeback_delay); 735 /* TODO: check frag_id match */ 736 if (status_code) { 737 p2p_dbg(p2p, "Service Discovery failed: status code %u", 738 status_code); 739 return; 740 } 741 742 if (*pos != WLAN_EID_ADV_PROTO) { 743 p2p_dbg(p2p, "Unexpected IE in GAS Comeback Response: %u", 744 *pos); 745 return; 746 } 747 pos++; 748 749 slen = *pos++; 750 if (slen > end - pos || slen < 2) { 751 p2p_dbg(p2p, "Invalid IE in GAS Comeback Response"); 752 return; 753 } 754 next = pos + slen; 755 pos++; /* skip QueryRespLenLimit and PAME-BI */ 756 757 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) { 758 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u", 759 *pos); 760 return; 761 } 762 763 pos = next; 764 /* Query Response */ 765 if (end - pos < 2) { 766 p2p_dbg(p2p, "Too short Query Response"); 767 return; 768 } 769 slen = WPA_GET_LE16(pos); 770 pos += 2; 771 p2p_dbg(p2p, "Query Response Length: %d", slen); 772 if (slen > end - pos) { 773 p2p_dbg(p2p, "Not enough Query Response data"); 774 return; 775 } 776 if (slen == 0) { 777 p2p_dbg(p2p, "No Query Response data"); 778 return; 779 } 780 end = pos + slen; 781 782 if (p2p->sd_rx_resp) { 783 /* 784 * ANQP header is only included in the first fragment; rest of 785 * the fragments start with continue TLVs. 786 */ 787 goto skip_nqp_header; 788 } 789 790 /* ANQP Query Response */ 791 if (end - pos < 4) 792 return; 793 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) { 794 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos)); 795 return; 796 } 797 pos += 2; 798 799 slen = WPA_GET_LE16(pos); 800 pos += 2; 801 p2p_dbg(p2p, "ANQP Query Response length: %u", slen); 802 if (slen < 3 + 1) { 803 p2p_dbg(p2p, "Invalid ANQP Query Response length"); 804 return; 805 } 806 if (end - pos < 4) 807 return; 808 809 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) { 810 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x", 811 WPA_GET_BE32(pos)); 812 return; 813 } 814 pos += 4; 815 816 if (end - pos < 2) 817 return; 818 p2p->sd_rx_update_indic = WPA_GET_LE16(pos); 819 p2p_dbg(p2p, "Service Update Indicator: %u", p2p->sd_rx_update_indic); 820 pos += 2; 821 822 skip_nqp_header: 823 if (wpabuf_resize(&p2p->sd_rx_resp, end - pos) < 0) 824 return; 825 wpabuf_put_data(p2p->sd_rx_resp, pos, end - pos); 826 p2p_dbg(p2p, "Current SD reassembly buffer length: %u", 827 (unsigned int) wpabuf_len(p2p->sd_rx_resp)); 828 829 if (more_frags) { 830 p2p_dbg(p2p, "More fragments remains"); 831 /* TODO: what would be a good size limit? */ 832 if (wpabuf_len(p2p->sd_rx_resp) > 64000) { 833 wpabuf_free(p2p->sd_rx_resp); 834 p2p->sd_rx_resp = NULL; 835 p2p_dbg(p2p, "Too long SD response - drop it"); 836 return; 837 } 838 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq); 839 return; 840 } 841 842 p2p->sd_peer = NULL; 843 844 if (p2p->sd_query) { 845 if (!p2p->sd_query->for_all_peers) { 846 struct p2p_sd_query *q; 847 p2p_dbg(p2p, "Remove completed SD query %p", 848 p2p->sd_query); 849 q = p2p->sd_query; 850 p2p_unlink_sd_query(p2p, p2p->sd_query); 851 p2p_free_sd_query(q); 852 } 853 p2p->sd_query = NULL; 854 } 855 856 if (p2p->cfg->sd_response) 857 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, 858 p2p->sd_rx_update_indic, 859 wpabuf_head(p2p->sd_rx_resp), 860 wpabuf_len(p2p->sd_rx_resp)); 861 wpabuf_free(p2p->sd_rx_resp); 862 p2p->sd_rx_resp = NULL; 863 864 p2p_continue_find(p2p); 865 } 866 867 868 void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst, 869 const struct wpabuf *tlvs) 870 { 871 struct p2p_sd_query *q; 872 873 q = os_zalloc(sizeof(*q)); 874 if (q == NULL) 875 return NULL; 876 877 if (dst) 878 os_memcpy(q->peer, dst, ETH_ALEN); 879 else 880 q->for_all_peers = 1; 881 882 q->tlvs = wpabuf_dup(tlvs); 883 if (q->tlvs == NULL) { 884 p2p_free_sd_query(q); 885 return NULL; 886 } 887 888 q->next = p2p->sd_queries; 889 p2p->sd_queries = q; 890 p2p_dbg(p2p, "Added SD Query %p", q); 891 892 if (dst == NULL) { 893 struct p2p_device *dev; 894 895 p2p->num_p2p_sd_queries++; 896 897 /* Update all the devices for the newly added broadcast query */ 898 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) { 899 if (dev->sd_pending_bcast_queries <= 0) 900 dev->sd_pending_bcast_queries = 1; 901 else 902 dev->sd_pending_bcast_queries++; 903 } 904 } 905 906 return q; 907 } 908 909 910 #ifdef CONFIG_WIFI_DISPLAY 911 void * p2p_sd_request_wfd(struct p2p_data *p2p, const u8 *dst, 912 const struct wpabuf *tlvs) 913 { 914 struct p2p_sd_query *q; 915 q = p2p_sd_request(p2p, dst, tlvs); 916 if (q) 917 q->wsd = 1; 918 return q; 919 } 920 #endif /* CONFIG_WIFI_DISPLAY */ 921 922 923 void p2p_sd_service_update(struct p2p_data *p2p) 924 { 925 p2p->srv_update_indic++; 926 } 927 928 929 int p2p_sd_cancel_request(struct p2p_data *p2p, void *req) 930 { 931 if (p2p_unlink_sd_query(p2p, req)) { 932 p2p_dbg(p2p, "Cancel pending SD query %p", req); 933 p2p_free_sd_query(req); 934 return 0; 935 } 936 return -1; 937 } 938
