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 unsigned int wait_time = 200; 430 431 /* 432 * In the 60 GHz, we have a smaller maximum frame length for management 433 * frames. 434 */ 435 max_len = (freq > 56160) ? 928 : 1400; 436 437 /* TODO: fix the length limit to match with the maximum frame length */ 438 if (wpabuf_len(resp_tlvs) > max_len) { 439 p2p_dbg(p2p, "SD response long enough to require fragmentation"); 440 if (p2p->sd_resp) { 441 /* 442 * TODO: Could consider storing the fragmented response 443 * separately for each peer to avoid having to drop old 444 * one if there is more than one pending SD query. 445 * Though, that would eat more memory, so there are 446 * also benefits to just using a single buffer. 447 */ 448 p2p_dbg(p2p, "Drop previous SD response"); 449 wpabuf_free(p2p->sd_resp); 450 } 451 p2p->sd_resp = wpabuf_dup(resp_tlvs); 452 if (p2p->sd_resp == NULL) { 453 p2p_err(p2p, "Failed to allocate SD response fragmentation area"); 454 return; 455 } 456 os_memcpy(p2p->sd_resp_addr, dst, ETH_ALEN); 457 p2p->sd_resp_dialog_token = dialog_token; 458 p2p->sd_resp_pos = 0; 459 p2p->sd_frag_id = 0; 460 resp = p2p_build_sd_response(dialog_token, WLAN_STATUS_SUCCESS, 461 1, p2p->srv_update_indic, NULL); 462 } else { 463 p2p_dbg(p2p, "SD response fits in initial response"); 464 wait_time = 0; /* no more SD frames in the sequence */ 465 resp = p2p_build_sd_response(dialog_token, 466 WLAN_STATUS_SUCCESS, 0, 467 p2p->srv_update_indic, resp_tlvs); 468 } 469 if (resp == NULL) 470 return; 471 472 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 473 if (p2p_send_action(p2p, freq, dst, p2p->cfg->dev_addr, 474 p2p->cfg->dev_addr, 475 wpabuf_head(resp), wpabuf_len(resp), wait_time) < 0) 476 p2p_dbg(p2p, "Failed to send Action frame"); 477 478 wpabuf_free(resp); 479 } 480 481 482 void p2p_rx_gas_initial_resp(struct p2p_data *p2p, const u8 *sa, 483 const u8 *data, size_t len, int rx_freq) 484 { 485 const u8 *pos = data; 486 const u8 *end = data + len; 487 const u8 *next; 488 u8 dialog_token; 489 u16 status_code; 490 u16 comeback_delay; 491 u16 slen; 492 u16 update_indic; 493 494 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL || 495 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) { 496 p2p_dbg(p2p, "Ignore unexpected GAS Initial Response from " 497 MACSTR, MAC2STR(sa)); 498 return; 499 } 500 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 501 p2p_clear_timeout(p2p); 502 503 p2p_dbg(p2p, "Received GAS Initial Response from " MACSTR " (len=%d)", 504 MAC2STR(sa), (int) len); 505 506 if (len < 5 + 2) { 507 p2p_dbg(p2p, "Too short GAS Initial Response frame"); 508 return; 509 } 510 511 dialog_token = *pos++; 512 /* TODO: check dialog_token match */ 513 status_code = WPA_GET_LE16(pos); 514 pos += 2; 515 comeback_delay = WPA_GET_LE16(pos); 516 pos += 2; 517 p2p_dbg(p2p, "dialog_token=%u status_code=%u comeback_delay=%u", 518 dialog_token, status_code, comeback_delay); 519 if (status_code) { 520 p2p_dbg(p2p, "Service Discovery failed: status code %u", 521 status_code); 522 return; 523 } 524 525 if (*pos != WLAN_EID_ADV_PROTO) { 526 p2p_dbg(p2p, "Unexpected IE in GAS Initial Response: %u", *pos); 527 return; 528 } 529 pos++; 530 531 slen = *pos++; 532 if (slen > end - pos || slen < 2) { 533 p2p_dbg(p2p, "Invalid IE in GAS Initial Response"); 534 return; 535 } 536 next = pos + slen; 537 pos++; /* skip QueryRespLenLimit and PAME-BI */ 538 539 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) { 540 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u", 541 *pos); 542 return; 543 } 544 545 pos = next; 546 /* Query Response */ 547 if (end - pos < 2) { 548 p2p_dbg(p2p, "Too short Query Response"); 549 return; 550 } 551 slen = WPA_GET_LE16(pos); 552 pos += 2; 553 p2p_dbg(p2p, "Query Response Length: %d", slen); 554 if (slen > end - pos) { 555 p2p_dbg(p2p, "Not enough Query Response data"); 556 return; 557 } 558 end = pos + slen; 559 560 if (comeback_delay) { 561 p2p_dbg(p2p, "Fragmented response - request fragments"); 562 if (p2p->sd_rx_resp) { 563 p2p_dbg(p2p, "Drop old SD reassembly buffer"); 564 wpabuf_free(p2p->sd_rx_resp); 565 p2p->sd_rx_resp = NULL; 566 } 567 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq); 568 return; 569 } 570 571 /* ANQP Query Response */ 572 if (end - pos < 4) 573 return; 574 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) { 575 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos)); 576 return; 577 } 578 pos += 2; 579 580 slen = WPA_GET_LE16(pos); 581 pos += 2; 582 if (slen > end - pos || slen < 3 + 1) { 583 p2p_dbg(p2p, "Invalid ANQP Query Response length"); 584 return; 585 } 586 587 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) { 588 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x", 589 WPA_GET_BE32(pos)); 590 return; 591 } 592 pos += 4; 593 594 if (end - pos < 2) 595 return; 596 update_indic = WPA_GET_LE16(pos); 597 p2p_dbg(p2p, "Service Update Indicator: %u", update_indic); 598 pos += 2; 599 600 p2p->sd_peer = NULL; 601 602 if (p2p->sd_query) { 603 if (!p2p->sd_query->for_all_peers) { 604 struct p2p_sd_query *q; 605 p2p_dbg(p2p, "Remove completed SD query %p", 606 p2p->sd_query); 607 q = p2p->sd_query; 608 p2p_unlink_sd_query(p2p, p2p->sd_query); 609 p2p_free_sd_query(q); 610 } 611 p2p->sd_query = NULL; 612 } 613 614 if (p2p->cfg->sd_response) 615 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, update_indic, 616 pos, end - pos); 617 p2p_continue_find(p2p); 618 } 619 620 621 void p2p_rx_gas_comeback_req(struct p2p_data *p2p, const u8 *sa, 622 const u8 *data, size_t len, int rx_freq) 623 { 624 struct wpabuf *resp; 625 u8 dialog_token; 626 size_t frag_len, max_len; 627 int more = 0; 628 629 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Request", data, len); 630 if (len < 1) 631 return; 632 dialog_token = *data; 633 p2p_dbg(p2p, "Dialog Token: %u", dialog_token); 634 if (dialog_token != p2p->sd_resp_dialog_token) { 635 p2p_dbg(p2p, "No pending SD response fragment for dialog token %u", 636 dialog_token); 637 return; 638 } 639 640 if (p2p->sd_resp == NULL) { 641 p2p_dbg(p2p, "No pending SD response fragment available"); 642 return; 643 } 644 if (os_memcmp(sa, p2p->sd_resp_addr, ETH_ALEN) != 0) { 645 p2p_dbg(p2p, "No pending SD response fragment for " MACSTR, 646 MAC2STR(sa)); 647 return; 648 } 649 650 /* 651 * In the 60 GHz, we have a smaller maximum frame length for management 652 * frames. 653 */ 654 max_len = (rx_freq > 56160) ? 928 : 1400; 655 frag_len = wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos; 656 if (frag_len > max_len) { 657 frag_len = max_len; 658 more = 1; 659 } 660 resp = p2p_build_gas_comeback_resp(dialog_token, WLAN_STATUS_SUCCESS, 661 p2p->srv_update_indic, 662 wpabuf_head_u8(p2p->sd_resp) + 663 p2p->sd_resp_pos, frag_len, 664 p2p->sd_frag_id, more, 665 wpabuf_len(p2p->sd_resp)); 666 if (resp == NULL) 667 return; 668 p2p_dbg(p2p, "Send GAS Comeback Response (frag_id %d more=%d frag_len=%d)", 669 p2p->sd_frag_id, more, (int) frag_len); 670 p2p->sd_frag_id++; 671 p2p->sd_resp_pos += frag_len; 672 673 if (more) { 674 p2p_dbg(p2p, "%d more bytes remain to be sent", 675 (int) (wpabuf_len(p2p->sd_resp) - p2p->sd_resp_pos)); 676 } else { 677 p2p_dbg(p2p, "All fragments of SD response sent"); 678 wpabuf_free(p2p->sd_resp); 679 p2p->sd_resp = NULL; 680 } 681 682 p2p->pending_action_state = P2P_NO_PENDING_ACTION; 683 if (p2p_send_action(p2p, rx_freq, sa, p2p->cfg->dev_addr, 684 p2p->cfg->dev_addr, 685 wpabuf_head(resp), wpabuf_len(resp), 200) < 0) 686 p2p_dbg(p2p, "Failed to send Action frame"); 687 688 wpabuf_free(resp); 689 } 690 691 692 void p2p_rx_gas_comeback_resp(struct p2p_data *p2p, const u8 *sa, 693 const u8 *data, size_t len, int rx_freq) 694 { 695 const u8 *pos = data; 696 const u8 *end = data + len; 697 const u8 *next; 698 u8 dialog_token; 699 u16 status_code; 700 u8 frag_id; 701 u8 more_frags; 702 u16 comeback_delay; 703 u16 slen; 704 705 wpa_hexdump(MSG_DEBUG, "P2P: RX GAS Comeback Response", data, len); 706 707 if (p2p->state != P2P_SD_DURING_FIND || p2p->sd_peer == NULL || 708 os_memcmp(sa, p2p->sd_peer->info.p2p_device_addr, ETH_ALEN) != 0) { 709 p2p_dbg(p2p, "Ignore unexpected GAS Comeback Response from " 710 MACSTR, MAC2STR(sa)); 711 return; 712 } 713 p2p->cfg->send_action_done(p2p->cfg->cb_ctx); 714 p2p_clear_timeout(p2p); 715 716 p2p_dbg(p2p, "Received GAS Comeback Response from " MACSTR " (len=%d)", 717 MAC2STR(sa), (int) len); 718 719 if (len < 6 + 2) { 720 p2p_dbg(p2p, "Too short GAS Comeback Response frame"); 721 return; 722 } 723 724 dialog_token = *pos++; 725 /* TODO: check dialog_token match */ 726 status_code = WPA_GET_LE16(pos); 727 pos += 2; 728 frag_id = *pos & 0x7f; 729 more_frags = (*pos & 0x80) >> 7; 730 pos++; 731 comeback_delay = WPA_GET_LE16(pos); 732 pos += 2; 733 p2p_dbg(p2p, "dialog_token=%u status_code=%u frag_id=%d more_frags=%d " 734 "comeback_delay=%u", 735 dialog_token, status_code, frag_id, more_frags, 736 comeback_delay); 737 /* TODO: check frag_id match */ 738 if (status_code) { 739 p2p_dbg(p2p, "Service Discovery failed: status code %u", 740 status_code); 741 return; 742 } 743 744 if (*pos != WLAN_EID_ADV_PROTO) { 745 p2p_dbg(p2p, "Unexpected IE in GAS Comeback Response: %u", 746 *pos); 747 return; 748 } 749 pos++; 750 751 slen = *pos++; 752 if (slen > end - pos || slen < 2) { 753 p2p_dbg(p2p, "Invalid IE in GAS Comeback Response"); 754 return; 755 } 756 next = pos + slen; 757 pos++; /* skip QueryRespLenLimit and PAME-BI */ 758 759 if (*pos != ACCESS_NETWORK_QUERY_PROTOCOL) { 760 p2p_dbg(p2p, "Unsupported GAS advertisement protocol id %u", 761 *pos); 762 return; 763 } 764 765 pos = next; 766 /* Query Response */ 767 if (end - pos < 2) { 768 p2p_dbg(p2p, "Too short Query Response"); 769 return; 770 } 771 slen = WPA_GET_LE16(pos); 772 pos += 2; 773 p2p_dbg(p2p, "Query Response Length: %d", slen); 774 if (slen > end - pos) { 775 p2p_dbg(p2p, "Not enough Query Response data"); 776 return; 777 } 778 if (slen == 0) { 779 p2p_dbg(p2p, "No Query Response data"); 780 return; 781 } 782 end = pos + slen; 783 784 if (p2p->sd_rx_resp) { 785 /* 786 * ANQP header is only included in the first fragment; rest of 787 * the fragments start with continue TLVs. 788 */ 789 goto skip_nqp_header; 790 } 791 792 /* ANQP Query Response */ 793 if (end - pos < 4) 794 return; 795 if (WPA_GET_LE16(pos) != ANQP_VENDOR_SPECIFIC) { 796 p2p_dbg(p2p, "Unsupported ANQP Info ID %u", WPA_GET_LE16(pos)); 797 return; 798 } 799 pos += 2; 800 801 slen = WPA_GET_LE16(pos); 802 pos += 2; 803 p2p_dbg(p2p, "ANQP Query Response length: %u", slen); 804 if (slen < 3 + 1) { 805 p2p_dbg(p2p, "Invalid ANQP Query Response length"); 806 return; 807 } 808 if (end - pos < 4) 809 return; 810 811 if (WPA_GET_BE32(pos) != P2P_IE_VENDOR_TYPE) { 812 p2p_dbg(p2p, "Unsupported ANQP vendor OUI-type %08x", 813 WPA_GET_BE32(pos)); 814 return; 815 } 816 pos += 4; 817 818 if (end - pos < 2) 819 return; 820 p2p->sd_rx_update_indic = WPA_GET_LE16(pos); 821 p2p_dbg(p2p, "Service Update Indicator: %u", p2p->sd_rx_update_indic); 822 pos += 2; 823 824 skip_nqp_header: 825 if (wpabuf_resize(&p2p->sd_rx_resp, end - pos) < 0) 826 return; 827 wpabuf_put_data(p2p->sd_rx_resp, pos, end - pos); 828 p2p_dbg(p2p, "Current SD reassembly buffer length: %u", 829 (unsigned int) wpabuf_len(p2p->sd_rx_resp)); 830 831 if (more_frags) { 832 p2p_dbg(p2p, "More fragments remains"); 833 /* TODO: what would be a good size limit? */ 834 if (wpabuf_len(p2p->sd_rx_resp) > 64000) { 835 wpabuf_free(p2p->sd_rx_resp); 836 p2p->sd_rx_resp = NULL; 837 p2p_dbg(p2p, "Too long SD response - drop it"); 838 return; 839 } 840 p2p_send_gas_comeback_req(p2p, sa, dialog_token, rx_freq); 841 return; 842 } 843 844 p2p->sd_peer = NULL; 845 846 if (p2p->sd_query) { 847 if (!p2p->sd_query->for_all_peers) { 848 struct p2p_sd_query *q; 849 p2p_dbg(p2p, "Remove completed SD query %p", 850 p2p->sd_query); 851 q = p2p->sd_query; 852 p2p_unlink_sd_query(p2p, p2p->sd_query); 853 p2p_free_sd_query(q); 854 } 855 p2p->sd_query = NULL; 856 } 857 858 if (p2p->cfg->sd_response) 859 p2p->cfg->sd_response(p2p->cfg->cb_ctx, sa, 860 p2p->sd_rx_update_indic, 861 wpabuf_head(p2p->sd_rx_resp), 862 wpabuf_len(p2p->sd_rx_resp)); 863 wpabuf_free(p2p->sd_rx_resp); 864 p2p->sd_rx_resp = NULL; 865 866 p2p_continue_find(p2p); 867 } 868 869 870 void * p2p_sd_request(struct p2p_data *p2p, const u8 *dst, 871 const struct wpabuf *tlvs) 872 { 873 struct p2p_sd_query *q; 874 875 q = os_zalloc(sizeof(*q)); 876 if (q == NULL) 877 return NULL; 878 879 if (dst) 880 os_memcpy(q->peer, dst, ETH_ALEN); 881 else 882 q->for_all_peers = 1; 883 884 q->tlvs = wpabuf_dup(tlvs); 885 if (q->tlvs == NULL) { 886 p2p_free_sd_query(q); 887 return NULL; 888 } 889 890 q->next = p2p->sd_queries; 891 p2p->sd_queries = q; 892 p2p_dbg(p2p, "Added SD Query %p", q); 893 894 if (dst == NULL) { 895 struct p2p_device *dev; 896 897 p2p->num_p2p_sd_queries++; 898 899 /* Update all the devices for the newly added broadcast query */ 900 dl_list_for_each(dev, &p2p->devices, struct p2p_device, list) { 901 if (dev->sd_pending_bcast_queries <= 0) 902 dev->sd_pending_bcast_queries = 1; 903 else 904 dev->sd_pending_bcast_queries++; 905 } 906 } 907 908 return q; 909 } 910 911 912 #ifdef CONFIG_WIFI_DISPLAY 913 void * p2p_sd_request_wfd(struct p2p_data *p2p, const u8 *dst, 914 const struct wpabuf *tlvs) 915 { 916 struct p2p_sd_query *q; 917 q = p2p_sd_request(p2p, dst, tlvs); 918 if (q) 919 q->wsd = 1; 920 return q; 921 } 922 #endif /* CONFIG_WIFI_DISPLAY */ 923 924 925 void p2p_sd_service_update(struct p2p_data *p2p) 926 { 927 p2p->srv_update_indic++; 928 } 929 930 931 int p2p_sd_cancel_request(struct p2p_data *p2p, void *req) 932 { 933 if (p2p_unlink_sd_query(p2p, req)) { 934 p2p_dbg(p2p, "Cancel pending SD query %p", req); 935 p2p_free_sd_query(req); 936 return 0; 937 } 938 return -1; 939 } 940
