wpa_supplicant/gas_query.c

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