1 /* 2 * Generic advertisement service (GAS) query 3 * Copyright (c) 2009, Atheros Communications 4 * Copyright (c) 2011-2014, Qualcomm Atheros, Inc. 5 * Copyright (c) 2011-2014, Jouni Malinen <j (at) w1.fi> 6 * 7 * This software may be distributed under the terms of the BSD license. 8 * See README for more details. 9 */ 10 11 #include "includes.h" 12 13 #include "common.h" 14 #include "utils/eloop.h" 15 #include "common/ieee802_11_defs.h" 16 #include "common/gas.h" 17 #include "common/wpa_ctrl.h" 18 #include "rsn_supp/wpa.h" 19 #include "wpa_supplicant_i.h" 20 #include "driver_i.h" 21 #include "offchannel.h" 22 #include "gas_query.h" 23 24 25 /** GAS query timeout in seconds */ 26 #define GAS_QUERY_TIMEOUT_PERIOD 2 27 28 /* GAS query wait-time / duration in ms */ 29 #define GAS_QUERY_WAIT_TIME_INITIAL 1000 30 #define GAS_QUERY_WAIT_TIME_COMEBACK 150 31 32 /** 33 * struct gas_query_pending - Pending GAS query 34 */ 35 struct gas_query_pending { 36 struct dl_list list; 37 struct gas_query *gas; 38 u8 addr[ETH_ALEN]; 39 u8 dialog_token; 40 u8 next_frag_id; 41 unsigned int wait_comeback:1; 42 unsigned int offchannel_tx_started:1; 43 unsigned int retry:1; 44 int freq; 45 u16 status_code; 46 struct wpabuf *req; 47 struct wpabuf *adv_proto; 48 struct wpabuf *resp; 49 struct os_reltime last_oper; 50 void (*cb)(void *ctx, const u8 *dst, u8 dialog_token, 51 enum gas_query_result result, 52 const struct wpabuf *adv_proto, 53 const struct wpabuf *resp, u16 status_code); 54 void *ctx; 55 }; 56 57 /** 58 * struct gas_query - Internal GAS query data 59 */ 60 struct gas_query { 61 struct wpa_supplicant *wpa_s; 62 struct dl_list pending; /* struct gas_query_pending */ 63 struct gas_query_pending *current; 64 struct wpa_radio_work *work; 65 }; 66 67 68 static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx); 69 static void gas_query_timeout(void *eloop_data, void *user_ctx); 70 static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx); 71 static void gas_query_tx_initial_req(struct gas_query *gas, 72 struct gas_query_pending *query); 73 static int gas_query_new_dialog_token(struct gas_query *gas, const u8 *dst); 74 75 76 static int ms_from_time(struct os_reltime *last) 77 { 78 struct os_reltime now, res; 79 80 os_get_reltime(&now); 81 os_reltime_sub(&now, last, &res); 82 return res.sec * 1000 + res.usec / 1000; 83 } 84 85 86 /** 87 * gas_query_init - Initialize GAS query component 88 * @wpa_s: Pointer to wpa_supplicant data 89 * Returns: Pointer to GAS query data or %NULL on failure 90 */ 91 struct gas_query * gas_query_init(struct wpa_supplicant *wpa_s) 92 { 93 struct gas_query *gas; 94 95 gas = os_zalloc(sizeof(*gas)); 96 if (gas == NULL) 97 return NULL; 98 99 gas->wpa_s = wpa_s; 100 dl_list_init(&gas->pending); 101 102 return gas; 103 } 104 105 106 static const char * gas_result_txt(enum gas_query_result result) 107 { 108 switch (result) { 109 case GAS_QUERY_SUCCESS: 110 return "SUCCESS"; 111 case GAS_QUERY_FAILURE: 112 return "FAILURE"; 113 case GAS_QUERY_TIMEOUT: 114 return "TIMEOUT"; 115 case GAS_QUERY_PEER_ERROR: 116 return "PEER_ERROR"; 117 case GAS_QUERY_INTERNAL_ERROR: 118 return "INTERNAL_ERROR"; 119 case GAS_QUERY_CANCELLED: 120 return "CANCELLED"; 121 case GAS_QUERY_DELETED_AT_DEINIT: 122 return "DELETED_AT_DEINIT"; 123 } 124 125 return "N/A"; 126 } 127 128 129 static void gas_query_free(struct gas_query_pending *query, int del_list) 130 { 131 struct gas_query *gas = query->gas; 132 133 if (del_list) 134 dl_list_del(&query->list); 135 136 if (gas->work && gas->work->ctx == query) { 137 radio_work_done(gas->work); 138 gas->work = NULL; 139 } 140 141 wpabuf_free(query->req); 142 wpabuf_free(query->adv_proto); 143 wpabuf_free(query->resp); 144 os_free(query); 145 } 146 147 148 static void gas_query_done(struct gas_query *gas, 149 struct gas_query_pending *query, 150 enum gas_query_result result) 151 { 152 wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_DONE "addr=" MACSTR 153 " dialog_token=%u freq=%d status_code=%u result=%s", 154 MAC2STR(query->addr), query->dialog_token, query->freq, 155 query->status_code, gas_result_txt(result)); 156 if (gas->current == query) 157 gas->current = NULL; 158 if (query->offchannel_tx_started) 159 offchannel_send_action_done(gas->wpa_s); 160 eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); 161 eloop_cancel_timeout(gas_query_timeout, gas, query); 162 eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query); 163 dl_list_del(&query->list); 164 query->cb(query->ctx, query->addr, query->dialog_token, result, 165 query->adv_proto, query->resp, query->status_code); 166 gas_query_free(query, 0); 167 } 168 169 170 /** 171 * gas_query_deinit - Deinitialize GAS query component 172 * @gas: GAS query data from gas_query_init() 173 */ 174 void gas_query_deinit(struct gas_query *gas) 175 { 176 struct gas_query_pending *query, *next; 177 178 if (gas == NULL) 179 return; 180 181 dl_list_for_each_safe(query, next, &gas->pending, 182 struct gas_query_pending, list) 183 gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT); 184 185 os_free(gas); 186 } 187 188 189 static struct gas_query_pending * 190 gas_query_get_pending(struct gas_query *gas, const u8 *addr, u8 dialog_token) 191 { 192 struct gas_query_pending *q; 193 dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) { 194 if (os_memcmp(q->addr, addr, ETH_ALEN) == 0 && 195 q->dialog_token == dialog_token) 196 return q; 197 } 198 return NULL; 199 } 200 201 202 static int gas_query_append(struct gas_query_pending *query, const u8 *data, 203 size_t len) 204 { 205 if (wpabuf_resize(&query->resp, len) < 0) { 206 wpa_printf(MSG_DEBUG, "GAS: No memory to store the response"); 207 return -1; 208 } 209 wpabuf_put_data(query->resp, data, len); 210 return 0; 211 } 212 213 214 static void gas_query_tx_status(struct wpa_supplicant *wpa_s, 215 unsigned int freq, const u8 *dst, 216 const u8 *src, const u8 *bssid, 217 const u8 *data, size_t data_len, 218 enum offchannel_send_action_result result) 219 { 220 struct gas_query_pending *query; 221 struct gas_query *gas = wpa_s->gas; 222 int dur; 223 224 if (gas->current == NULL) { 225 wpa_printf(MSG_DEBUG, "GAS: Unexpected TX status: freq=%u dst=" 226 MACSTR " result=%d - no query in progress", 227 freq, MAC2STR(dst), result); 228 return; 229 } 230 231 query = gas->current; 232 233 dur = ms_from_time(&query->last_oper); 234 wpa_printf(MSG_DEBUG, "GAS: TX status: freq=%u dst=" MACSTR 235 " result=%d query=%p dialog_token=%u dur=%d ms", 236 freq, MAC2STR(dst), result, query, query->dialog_token, dur); 237 if (os_memcmp(dst, query->addr, ETH_ALEN) != 0) { 238 wpa_printf(MSG_DEBUG, "GAS: TX status for unexpected destination"); 239 return; 240 } 241 os_get_reltime(&query->last_oper); 242 243 if (result == OFFCHANNEL_SEND_ACTION_SUCCESS) { 244 eloop_cancel_timeout(gas_query_timeout, gas, query); 245 eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, 246 gas_query_timeout, gas, query); 247 if (query->wait_comeback && !query->retry) { 248 eloop_cancel_timeout(gas_query_rx_comeback_timeout, 249 gas, query); 250 eloop_register_timeout( 251 0, (GAS_QUERY_WAIT_TIME_COMEBACK + 10) * 1000, 252 gas_query_rx_comeback_timeout, gas, query); 253 } 254 } 255 if (result == OFFCHANNEL_SEND_ACTION_FAILED) { 256 eloop_cancel_timeout(gas_query_timeout, gas, query); 257 eloop_register_timeout(0, 0, gas_query_timeout, gas, query); 258 } 259 } 260 261 262 static int pmf_in_use(struct wpa_supplicant *wpa_s, const u8 *addr) 263 { 264 if (wpa_s->current_ssid == NULL || 265 wpa_s->wpa_state < WPA_4WAY_HANDSHAKE || 266 os_memcmp(addr, wpa_s->bssid, ETH_ALEN) != 0) 267 return 0; 268 return wpa_sm_pmf_enabled(wpa_s->wpa); 269 } 270 271 272 static int gas_query_tx(struct gas_query *gas, struct gas_query_pending *query, 273 struct wpabuf *req, unsigned int wait_time) 274 { 275 int res, prot = pmf_in_use(gas->wpa_s, query->addr); 276 277 wpa_printf(MSG_DEBUG, "GAS: Send action frame to " MACSTR " len=%u " 278 "freq=%d prot=%d", MAC2STR(query->addr), 279 (unsigned int) wpabuf_len(req), query->freq, prot); 280 if (prot) { 281 u8 *categ = wpabuf_mhead_u8(req); 282 *categ = WLAN_ACTION_PROTECTED_DUAL; 283 } 284 os_get_reltime(&query->last_oper); 285 if (gas->wpa_s->max_remain_on_chan && 286 wait_time > gas->wpa_s->max_remain_on_chan) 287 wait_time = gas->wpa_s->max_remain_on_chan; 288 res = offchannel_send_action(gas->wpa_s, query->freq, query->addr, 289 gas->wpa_s->own_addr, query->addr, 290 wpabuf_head(req), wpabuf_len(req), 291 wait_time, gas_query_tx_status, 0); 292 if (res == 0) 293 query->offchannel_tx_started = 1; 294 return res; 295 } 296 297 298 static void gas_query_tx_comeback_req(struct gas_query *gas, 299 struct gas_query_pending *query) 300 { 301 struct wpabuf *req; 302 unsigned int wait_time; 303 304 req = gas_build_comeback_req(query->dialog_token); 305 if (req == NULL) { 306 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 307 return; 308 } 309 310 wait_time = (query->retry || !query->offchannel_tx_started) ? 311 GAS_QUERY_WAIT_TIME_INITIAL : GAS_QUERY_WAIT_TIME_COMEBACK; 312 313 if (gas_query_tx(gas, query, req, wait_time) < 0) { 314 wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to " 315 MACSTR, MAC2STR(query->addr)); 316 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 317 } 318 319 wpabuf_free(req); 320 } 321 322 323 static void gas_query_rx_comeback_timeout(void *eloop_data, void *user_ctx) 324 { 325 struct gas_query *gas = eloop_data; 326 struct gas_query_pending *query = user_ctx; 327 int dialog_token; 328 329 wpa_printf(MSG_DEBUG, 330 "GAS: No response to comeback request received (retry=%u)", 331 query->retry); 332 if (gas->current != query || query->retry) 333 return; 334 dialog_token = gas_query_new_dialog_token(gas, query->addr); 335 if (dialog_token < 0) 336 return; 337 wpa_printf(MSG_DEBUG, 338 "GAS: Retry GAS query due to comeback response timeout"); 339 query->retry = 1; 340 query->dialog_token = dialog_token; 341 *(wpabuf_mhead_u8(query->req) + 2) = dialog_token; 342 query->wait_comeback = 0; 343 query->next_frag_id = 0; 344 wpabuf_free(query->adv_proto); 345 query->adv_proto = NULL; 346 eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); 347 eloop_cancel_timeout(gas_query_timeout, gas, query); 348 gas_query_tx_initial_req(gas, query); 349 } 350 351 352 static void gas_query_tx_comeback_timeout(void *eloop_data, void *user_ctx) 353 { 354 struct gas_query *gas = eloop_data; 355 struct gas_query_pending *query = user_ctx; 356 357 wpa_printf(MSG_DEBUG, "GAS: Comeback timeout for request to " MACSTR, 358 MAC2STR(query->addr)); 359 gas_query_tx_comeback_req(gas, query); 360 } 361 362 363 static void gas_query_tx_comeback_req_delay(struct gas_query *gas, 364 struct gas_query_pending *query, 365 u16 comeback_delay) 366 { 367 unsigned int secs, usecs; 368 369 if (comeback_delay > 1 && query->offchannel_tx_started) { 370 offchannel_send_action_done(gas->wpa_s); 371 query->offchannel_tx_started = 0; 372 } 373 374 secs = (comeback_delay * 1024) / 1000000; 375 usecs = comeback_delay * 1024 - secs * 1000000; 376 wpa_printf(MSG_DEBUG, "GAS: Send comeback request to " MACSTR 377 " in %u secs %u usecs", MAC2STR(query->addr), secs, usecs); 378 eloop_cancel_timeout(gas_query_tx_comeback_timeout, gas, query); 379 eloop_register_timeout(secs, usecs, gas_query_tx_comeback_timeout, 380 gas, query); 381 } 382 383 384 static void gas_query_rx_initial(struct gas_query *gas, 385 struct gas_query_pending *query, 386 const u8 *adv_proto, const u8 *resp, 387 size_t len, u16 comeback_delay) 388 { 389 wpa_printf(MSG_DEBUG, "GAS: Received initial response from " 390 MACSTR " (dialog_token=%u comeback_delay=%u)", 391 MAC2STR(query->addr), query->dialog_token, comeback_delay); 392 393 query->adv_proto = wpabuf_alloc_copy(adv_proto, 2 + adv_proto[1]); 394 if (query->adv_proto == NULL) { 395 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 396 return; 397 } 398 399 if (comeback_delay) { 400 query->wait_comeback = 1; 401 gas_query_tx_comeback_req_delay(gas, query, comeback_delay); 402 return; 403 } 404 405 /* Query was completed without comeback mechanism */ 406 if (gas_query_append(query, resp, len) < 0) { 407 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 408 return; 409 } 410 411 gas_query_done(gas, query, GAS_QUERY_SUCCESS); 412 } 413 414 415 static void gas_query_rx_comeback(struct gas_query *gas, 416 struct gas_query_pending *query, 417 const u8 *adv_proto, const u8 *resp, 418 size_t len, u8 frag_id, u8 more_frags, 419 u16 comeback_delay) 420 { 421 wpa_printf(MSG_DEBUG, "GAS: Received comeback response from " 422 MACSTR " (dialog_token=%u frag_id=%u more_frags=%u " 423 "comeback_delay=%u)", 424 MAC2STR(query->addr), query->dialog_token, frag_id, 425 more_frags, comeback_delay); 426 eloop_cancel_timeout(gas_query_rx_comeback_timeout, gas, query); 427 428 if ((size_t) 2 + adv_proto[1] != wpabuf_len(query->adv_proto) || 429 os_memcmp(adv_proto, wpabuf_head(query->adv_proto), 430 wpabuf_len(query->adv_proto)) != 0) { 431 wpa_printf(MSG_DEBUG, "GAS: Advertisement Protocol changed " 432 "between initial and comeback response from " 433 MACSTR, MAC2STR(query->addr)); 434 gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); 435 return; 436 } 437 438 if (comeback_delay) { 439 if (frag_id) { 440 wpa_printf(MSG_DEBUG, "GAS: Invalid comeback response " 441 "with non-zero frag_id and comeback_delay " 442 "from " MACSTR, MAC2STR(query->addr)); 443 gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); 444 return; 445 } 446 gas_query_tx_comeback_req_delay(gas, query, comeback_delay); 447 return; 448 } 449 450 if (frag_id != query->next_frag_id) { 451 wpa_printf(MSG_DEBUG, "GAS: Unexpected frag_id in response " 452 "from " MACSTR, MAC2STR(query->addr)); 453 if (frag_id + 1 == query->next_frag_id) { 454 wpa_printf(MSG_DEBUG, "GAS: Drop frame as possible " 455 "retry of previous fragment"); 456 return; 457 } 458 gas_query_done(gas, query, GAS_QUERY_PEER_ERROR); 459 return; 460 } 461 query->next_frag_id++; 462 463 if (gas_query_append(query, resp, len) < 0) { 464 gas_query_done(gas, query, GAS_QUERY_INTERNAL_ERROR); 465 return; 466 } 467 468 if (more_frags) { 469 gas_query_tx_comeback_req(gas, query); 470 return; 471 } 472 473 gas_query_done(gas, query, GAS_QUERY_SUCCESS); 474 } 475 476 477 /** 478 * gas_query_rx - Indicate reception of a Public Action or Protected Dual frame 479 * @gas: GAS query data from gas_query_init() 480 * @da: Destination MAC address of the Action frame 481 * @sa: Source MAC address of the Action frame 482 * @bssid: BSSID of the Action frame 483 * @categ: Category of the Action frame 484 * @data: Payload of the Action frame 485 * @len: Length of @data 486 * @freq: Frequency (in MHz) on which the frame was received 487 * Returns: 0 if the Public Action frame was a GAS frame or -1 if not 488 */ 489 int gas_query_rx(struct gas_query *gas, const u8 *da, const u8 *sa, 490 const u8 *bssid, u8 categ, const u8 *data, size_t len, 491 int freq) 492 { 493 struct gas_query_pending *query; 494 u8 action, dialog_token, frag_id = 0, more_frags = 0; 495 u16 comeback_delay, resp_len; 496 const u8 *pos, *adv_proto; 497 int prot, pmf; 498 unsigned int left; 499 500 if (gas == NULL || len < 4) 501 return -1; 502 503 prot = categ == WLAN_ACTION_PROTECTED_DUAL; 504 pmf = pmf_in_use(gas->wpa_s, sa); 505 if (prot && !pmf) { 506 wpa_printf(MSG_DEBUG, "GAS: Drop unexpected protected GAS frame when PMF is disabled"); 507 return 0; 508 } 509 if (!prot && pmf) { 510 wpa_printf(MSG_DEBUG, "GAS: Drop unexpected unprotected GAS frame when PMF is enabled"); 511 return 0; 512 } 513 514 pos = data; 515 action = *pos++; 516 dialog_token = *pos++; 517 518 if (action != WLAN_PA_GAS_INITIAL_RESP && 519 action != WLAN_PA_GAS_COMEBACK_RESP) 520 return -1; /* Not a GAS response */ 521 522 query = gas_query_get_pending(gas, sa, dialog_token); 523 if (query == NULL) { 524 wpa_printf(MSG_DEBUG, "GAS: No pending query found for " MACSTR 525 " dialog token %u", MAC2STR(sa), dialog_token); 526 return -1; 527 } 528 529 wpa_printf(MSG_DEBUG, "GAS: Response in %d ms from " MACSTR, 530 ms_from_time(&query->last_oper), MAC2STR(sa)); 531 532 if (query->wait_comeback && action == WLAN_PA_GAS_INITIAL_RESP) { 533 wpa_printf(MSG_DEBUG, "GAS: Unexpected initial response from " 534 MACSTR " dialog token %u when waiting for comeback " 535 "response", MAC2STR(sa), dialog_token); 536 return 0; 537 } 538 539 if (!query->wait_comeback && action == WLAN_PA_GAS_COMEBACK_RESP) { 540 wpa_printf(MSG_DEBUG, "GAS: Unexpected comeback response from " 541 MACSTR " dialog token %u when waiting for initial " 542 "response", MAC2STR(sa), dialog_token); 543 return 0; 544 } 545 546 query->status_code = WPA_GET_LE16(pos); 547 pos += 2; 548 549 if (query->status_code == WLAN_STATUS_QUERY_RESP_OUTSTANDING && 550 action == WLAN_PA_GAS_COMEBACK_RESP) { 551 wpa_printf(MSG_DEBUG, "GAS: Allow non-zero status for outstanding comeback response"); 552 } else if (query->status_code != WLAN_STATUS_SUCCESS) { 553 wpa_printf(MSG_DEBUG, "GAS: Query to " MACSTR " dialog token " 554 "%u failed - status code %u", 555 MAC2STR(sa), dialog_token, query->status_code); 556 gas_query_done(gas, query, GAS_QUERY_FAILURE); 557 return 0; 558 } 559 560 if (action == WLAN_PA_GAS_COMEBACK_RESP) { 561 if (pos + 1 > data + len) 562 return 0; 563 frag_id = *pos & 0x7f; 564 more_frags = (*pos & 0x80) >> 7; 565 pos++; 566 } 567 568 /* Comeback Delay */ 569 if (pos + 2 > data + len) 570 return 0; 571 comeback_delay = WPA_GET_LE16(pos); 572 pos += 2; 573 574 /* Advertisement Protocol element */ 575 if (pos + 2 > data + len || pos + 2 + pos[1] > data + len) { 576 wpa_printf(MSG_DEBUG, "GAS: No room for Advertisement " 577 "Protocol element in the response from " MACSTR, 578 MAC2STR(sa)); 579 return 0; 580 } 581 582 if (*pos != WLAN_EID_ADV_PROTO) { 583 wpa_printf(MSG_DEBUG, "GAS: Unexpected Advertisement " 584 "Protocol element ID %u in response from " MACSTR, 585 *pos, MAC2STR(sa)); 586 return 0; 587 } 588 589 adv_proto = pos; 590 pos += 2 + pos[1]; 591 592 /* Query Response Length */ 593 if (pos + 2 > data + len) { 594 wpa_printf(MSG_DEBUG, "GAS: No room for GAS Response Length"); 595 return 0; 596 } 597 resp_len = WPA_GET_LE16(pos); 598 pos += 2; 599 600 left = data + len - pos; 601 if (resp_len > left) { 602 wpa_printf(MSG_DEBUG, "GAS: Truncated Query Response in " 603 "response from " MACSTR, MAC2STR(sa)); 604 return 0; 605 } 606 607 if (resp_len < left) { 608 wpa_printf(MSG_DEBUG, "GAS: Ignore %u octets of extra data " 609 "after Query Response from " MACSTR, 610 left - resp_len, MAC2STR(sa)); 611 } 612 613 if (action == WLAN_PA_GAS_COMEBACK_RESP) 614 gas_query_rx_comeback(gas, query, adv_proto, pos, resp_len, 615 frag_id, more_frags, comeback_delay); 616 else 617 gas_query_rx_initial(gas, query, adv_proto, pos, resp_len, 618 comeback_delay); 619 620 return 0; 621 } 622 623 624 static void gas_query_timeout(void *eloop_data, void *user_ctx) 625 { 626 struct gas_query *gas = eloop_data; 627 struct gas_query_pending *query = user_ctx; 628 629 wpa_printf(MSG_DEBUG, "GAS: No response received for query to " MACSTR 630 " dialog token %u", 631 MAC2STR(query->addr), query->dialog_token); 632 gas_query_done(gas, query, GAS_QUERY_TIMEOUT); 633 } 634 635 636 static int gas_query_dialog_token_available(struct gas_query *gas, 637 const u8 *dst, u8 dialog_token) 638 { 639 struct gas_query_pending *q; 640 dl_list_for_each(q, &gas->pending, struct gas_query_pending, list) { 641 if (os_memcmp(dst, q->addr, ETH_ALEN) == 0 && 642 dialog_token == q->dialog_token) 643 return 0; 644 } 645 646 return 1; 647 } 648 649 650 static void gas_query_start_cb(struct wpa_radio_work *work, int deinit) 651 { 652 struct gas_query_pending *query = work->ctx; 653 struct gas_query *gas = query->gas; 654 struct wpa_supplicant *wpa_s = gas->wpa_s; 655 656 if (deinit) { 657 if (work->started) { 658 gas->work = NULL; 659 gas_query_done(gas, query, GAS_QUERY_DELETED_AT_DEINIT); 660 return; 661 } 662 663 gas_query_free(query, 1); 664 return; 665 } 666 667 if (wpas_update_random_addr_disassoc(wpa_s) < 0) { 668 wpa_msg(wpa_s, MSG_INFO, 669 "Failed to assign random MAC address for GAS"); 670 gas_query_free(query, 1); 671 radio_work_done(work); 672 return; 673 } 674 675 gas->work = work; 676 gas_query_tx_initial_req(gas, query); 677 } 678 679 680 static void gas_query_tx_initial_req(struct gas_query *gas, 681 struct gas_query_pending *query) 682 { 683 if (gas_query_tx(gas, query, query->req, 684 GAS_QUERY_WAIT_TIME_INITIAL) < 0) { 685 wpa_printf(MSG_DEBUG, "GAS: Failed to send Action frame to " 686 MACSTR, MAC2STR(query->addr)); 687 gas_query_free(query, 1); 688 return; 689 } 690 gas->current = query; 691 692 wpa_printf(MSG_DEBUG, "GAS: Starting query timeout for dialog token %u", 693 query->dialog_token); 694 eloop_register_timeout(GAS_QUERY_TIMEOUT_PERIOD, 0, 695 gas_query_timeout, gas, query); 696 } 697 698 699 static int gas_query_new_dialog_token(struct gas_query *gas, const u8 *dst) 700 { 701 static int next_start = 0; 702 int dialog_token; 703 704 for (dialog_token = 0; dialog_token < 256; dialog_token++) { 705 if (gas_query_dialog_token_available( 706 gas, dst, (next_start + dialog_token) % 256)) 707 break; 708 } 709 if (dialog_token == 256) 710 return -1; /* Too many pending queries */ 711 dialog_token = (next_start + dialog_token) % 256; 712 next_start = (dialog_token + 1) % 256; 713 return dialog_token; 714 } 715 716 717 /** 718 * gas_query_req - Request a GAS query 719 * @gas: GAS query data from gas_query_init() 720 * @dst: Destination MAC address for the query 721 * @freq: Frequency (in MHz) for the channel on which to send the query 722 * @req: GAS query payload (to be freed by gas_query module in case of success 723 * return) 724 * @cb: Callback function for reporting GAS query result and response 725 * @ctx: Context pointer to use with the @cb call 726 * Returns: dialog token (>= 0) on success or -1 on failure 727 */ 728 int gas_query_req(struct gas_query *gas, const u8 *dst, int freq, 729 struct wpabuf *req, 730 void (*cb)(void *ctx, const u8 *dst, u8 dialog_token, 731 enum gas_query_result result, 732 const struct wpabuf *adv_proto, 733 const struct wpabuf *resp, u16 status_code), 734 void *ctx) 735 { 736 struct gas_query_pending *query; 737 int dialog_token; 738 739 if (wpabuf_len(req) < 3) 740 return -1; 741 742 dialog_token = gas_query_new_dialog_token(gas, dst); 743 if (dialog_token < 0) 744 return -1; 745 746 query = os_zalloc(sizeof(*query)); 747 if (query == NULL) 748 return -1; 749 750 query->gas = gas; 751 os_memcpy(query->addr, dst, ETH_ALEN); 752 query->dialog_token = dialog_token; 753 query->freq = freq; 754 query->cb = cb; 755 query->ctx = ctx; 756 query->req = req; 757 dl_list_add(&gas->pending, &query->list); 758 759 *(wpabuf_mhead_u8(req) + 2) = dialog_token; 760 761 wpa_msg(gas->wpa_s, MSG_INFO, GAS_QUERY_START "addr=" MACSTR 762 " dialog_token=%u freq=%d", 763 MAC2STR(query->addr), query->dialog_token, query->freq); 764 765 if (radio_add_work(gas->wpa_s, freq, "gas-query", 0, gas_query_start_cb, 766 query) < 0) { 767 gas_query_free(query, 1); 768 return -1; 769 } 770 771 return dialog_token; 772 } 773 774 775 /** 776 * gas_query_cancel - Cancel a pending GAS query 777 * @gas: GAS query data from gas_query_init() 778 * @dst: Destination MAC address for the query 779 * @dialog_token: Dialog token from gas_query_req() 780 */ 781 void gas_query_cancel(struct gas_query *gas, const u8 *dst, u8 dialog_token) 782 { 783 struct gas_query_pending *query; 784 785 query = gas_query_get_pending(gas, dst, dialog_token); 786 if (query) 787 gas_query_done(gas, query, GAS_QUERY_CANCELLED); 788 789 } 790
