wpa_supplicant/wmm_ac.c

   1 /*
   2  * Wi-Fi Multimedia Admission Control (WMM-AC)
   3  * Copyright(c) 2014, Intel Mobile Communication GmbH.
   4  * Copyright(c) 2014, Intel Corporation. All rights reserved.
   5  *
   6  * This software may be distributed under the terms of the BSD license.
   7  * See README for more details.
   8  */
   9
  10 #include "includes.h"
  11
  12 #include "utils/common.h"
  13 #include "utils/list.h"
  14 #include "utils/eloop.h"
  15 #include "common/ieee802_11_common.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "bss.h"
  18 #include "driver_i.h"
  19 #include "wmm_ac.h"
  20
  21 static void wmm_ac_addts_req_timeout(void *eloop_ctx, void *timeout_ctx);
  22
  23 static const enum wmm_ac up_to_ac[8] = {
  24         WMM_AC_BK,
  25         WMM_AC_BE,
  26         WMM_AC_BE,
  27         WMM_AC_BK,
  28         WMM_AC_VI,
  29         WMM_AC_VI,
  30         WMM_AC_VO,
  31         WMM_AC_VO
  32 };
  33
  34
  35 static inline u8 wmm_ac_get_tsid(const struct wmm_tspec_element *tspec)
  36 {
  37         return (tspec->ts_info[0] >> 1) & 0x0f;
  38 }
  39
  40
  41 static u8 wmm_ac_get_direction(const struct wmm_tspec_element *tspec)
  42 {
  43         return (tspec->ts_info[0] >> 5) & 0x03;
  44 }
  45
  46
  47 static u8 wmm_ac_get_user_priority(const struct wmm_tspec_element *tspec)
  48 {
  49         return (tspec->ts_info[1] >> 3) & 0x07;
  50 }
  51
  52
  53 static u8 wmm_ac_direction_to_idx(u8 direction)
  54 {
  55         switch (direction) {
  56         case WMM_AC_DIR_UPLINK:
  57                 return TS_DIR_IDX_UPLINK;
  58         case WMM_AC_DIR_DOWNLINK:
  59                 return TS_DIR_IDX_DOWNLINK;
  60         case WMM_AC_DIR_BIDIRECTIONAL:
  61                 return TS_DIR_IDX_BIDI;
  62         default:
  63                 wpa_printf(MSG_ERROR, "Invalid direction: %d", direction);
  64                 return WMM_AC_DIR_UPLINK;
  65         }
  66 }
  67
  68
  69 static int wmm_ac_add_ts(struct wpa_supplicant *wpa_s, const u8 *addr,
  70                          const struct wmm_tspec_element *tspec)
  71 {
  72         struct wmm_tspec_element *_tspec;
  73         int ret;
  74         u16 admitted_time = le_to_host16(tspec->medium_time);
  75         u8 up = wmm_ac_get_user_priority(tspec);
  76         u8 ac = up_to_ac[up];
  77         u8 dir = wmm_ac_get_direction(tspec);
  78         u8 tsid = wmm_ac_get_tsid(tspec);
  79         enum ts_dir_idx idx = wmm_ac_direction_to_idx(dir);
  80
  81         /* should have been verified before, but double-check here */
  82         if (wpa_s->tspecs[ac][idx]) {
  83                 wpa_printf(MSG_ERROR,
  84                            "WMM AC: tspec (ac=%d, dir=%d) already exists!",
  85                            ac, dir);
  86                 return -1;
  87         }
  88
  89         /* copy tspec */
  90         _tspec = os_malloc(sizeof(*_tspec));
  91         if (!_tspec)
  92                 return -1;
  93
  94         /* store the admitted TSPEC */
  95         os_memcpy(_tspec, tspec, sizeof(*_tspec));
  96
  97         if (dir != WMM_AC_DIR_DOWNLINK) {
  98                 ret = wpa_drv_add_ts(wpa_s, tsid, addr, up, admitted_time);
  99                 wpa_printf(MSG_DEBUG,
 100                            "WMM AC: Add TS: addr=" MACSTR
 101                            " TSID=%u admitted time=%u, ret=%d",
 102                            MAC2STR(addr), tsid, admitted_time, ret);
 103                 if (ret < 0) {
 104                         os_free(_tspec);
 105                         return -1;
 106                 }
 107         }
 108
 109         wpa_s->tspecs[ac][idx] = _tspec;
 110
 111         wpa_printf(MSG_DEBUG, "Traffic stream was created successfully");
 112
 113         wpa_msg(wpa_s, MSG_INFO, WMM_AC_EVENT_TSPEC_ADDED
 114                 "tsid=%d addr=" MACSTR " admitted_time=%d",
 115                 tsid, MAC2STR(addr), admitted_time);
 116
 117         return 0;
 118 }
 119
 120
 121 static void wmm_ac_del_ts_idx(struct wpa_supplicant *wpa_s, u8 ac,
 122                               enum ts_dir_idx dir)
 123 {
 124         struct wmm_tspec_element *tspec = wpa_s->tspecs[ac][dir];
 125         u8 tsid;
 126
 127         if (!tspec)
 128                 return;
 129
 130         tsid = wmm_ac_get_tsid(tspec);
 131         wpa_printf(MSG_DEBUG, "WMM AC: Del TS ac=%d tsid=%d", ac, tsid);
 132
 133         /* update the driver in case of uplink/bidi */
 134         if (wmm_ac_get_direction(tspec) != WMM_AC_DIR_DOWNLINK)
 135                 wpa_drv_del_ts(wpa_s, tsid, wpa_s->bssid);
 136
 137         wpa_msg(wpa_s, MSG_INFO, WMM_AC_EVENT_TSPEC_REMOVED
 138                 "tsid=%d addr=" MACSTR, tsid, MAC2STR(wpa_s->bssid));
 139
 140         os_free(wpa_s->tspecs[ac][dir]);
 141         wpa_s->tspecs[ac][dir] = NULL;
 142 }
 143
 144
 145 static void wmm_ac_del_req(struct wpa_supplicant *wpa_s, int failed)
 146 {
 147         struct wmm_ac_addts_request *req = wpa_s->addts_request;
 148
 149         if (!req)
 150                 return;
 151
 152         if (failed)
 153                 wpa_msg(wpa_s, MSG_INFO, WMM_AC_EVENT_TSPEC_REQ_FAILED
 154                         "tsid=%u", wmm_ac_get_tsid(&req->tspec));
 155
 156         eloop_cancel_timeout(wmm_ac_addts_req_timeout, wpa_s, req);
 157         wpa_s->addts_request = NULL;
 158         os_free(req);
 159 }
 160
 161
 162 static void wmm_ac_addts_req_timeout(void *eloop_ctx, void *timeout_ctx)
 163 {
 164         struct wpa_supplicant *wpa_s = eloop_ctx;
 165         struct wmm_ac_addts_request *addts_req = timeout_ctx;
 166
 167         wpa_printf(MSG_DEBUG,
 168                    "Timeout getting ADDTS response (tsid=%d up=%d)",
 169                    wmm_ac_get_tsid(&addts_req->tspec),
 170                    wmm_ac_get_user_priority(&addts_req->tspec));
 171
 172         wmm_ac_del_req(wpa_s, 1);
 173 }
 174
 175
 176 static int wmm_ac_send_addts_request(struct wpa_supplicant *wpa_s,
 177                                      const struct wmm_ac_addts_request *req)
 178 {
 179         struct wpabuf *buf;
 180         int ret;
 181
 182         wpa_printf(MSG_DEBUG, "Sending ADDTS Request to " MACSTR,
 183                    MAC2STR(req->address));
 184
 185         /* category + action code + dialog token + status + sizeof(tspec) */
 186         buf = wpabuf_alloc(4 + sizeof(req->tspec));
 187         if (!buf) {
 188                 wpa_printf(MSG_ERROR, "WMM AC: Allocation error");
 189                 return -1;
 190         }
 191
 192         wpabuf_put_u8(buf, WLAN_ACTION_WMM);
 193         wpabuf_put_u8(buf, WMM_ACTION_CODE_ADDTS_REQ);
 194         wpabuf_put_u8(buf, req->dialog_token);
 195         wpabuf_put_u8(buf, 0); /* status code */
 196         wpabuf_put_data(buf, &req->tspec, sizeof(req->tspec));
 197
 198         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, req->address,
 199                                 wpa_s->own_addr, wpa_s->bssid,
 200                                 wpabuf_head(buf), wpabuf_len(buf), 0);
 201         if (ret) {
 202                 wpa_printf(MSG_WARNING,
 203                            "WMM AC: Failed to send ADDTS Request");
 204         }
 205
 206         wpabuf_free(buf);
 207         return ret;
 208 }
 209
 210
 211 static int wmm_ac_send_delts(struct wpa_supplicant *wpa_s,
 212                              const struct wmm_tspec_element *tspec,
 213                              const u8 *address)
 214 {
 215         struct wpabuf *buf;
 216         int ret;
 217
 218         /* category + action code + dialog token + status + sizeof(tspec) */
 219         buf = wpabuf_alloc(4 + sizeof(*tspec));
 220         if (!buf)
 221                 return -1;
 222
 223         wpa_printf(MSG_DEBUG, "Sending DELTS to " MACSTR, MAC2STR(address));
 224
 225         /* category + action code + dialog token + status + sizeof(tspec) */
 226         wpabuf_put_u8(buf, WLAN_ACTION_WMM);
 227         wpabuf_put_u8(buf, WMM_ACTION_CODE_DELTS);
 228         wpabuf_put_u8(buf, 0); /* Dialog Token (not used) */
 229         wpabuf_put_u8(buf, 0); /* Status Code (not used) */
 230         wpabuf_put_data(buf, tspec, sizeof(*tspec));
 231
 232         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, address,
 233                                   wpa_s->own_addr, wpa_s->bssid,
 234                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 235         if (ret)
 236                 wpa_printf(MSG_WARNING, "Failed to send DELTS frame");
 237
 238         wpabuf_free(buf);
 239         return ret;
 240 }
 241
 242
 243 /* return the AC using the given TSPEC tid */
 244 static int wmm_ac_find_tsid(struct wpa_supplicant *wpa_s, u8 tsid,
 245                             enum ts_dir_idx *dir)
 246 {
 247         int ac;
 248         enum ts_dir_idx idx;
 249
 250         for (ac = 0; ac < WMM_AC_NUM; ac++) {
 251                 for (idx = 0; idx < TS_DIR_IDX_COUNT; idx++) {
 252                         if (wpa_s->tspecs[ac][idx] &&
 253                             wmm_ac_get_tsid(wpa_s->tspecs[ac][idx]) == tsid) {
 254                                 if (dir)
 255                                         *dir = idx;
 256                                 return ac;
 257                         }
 258                 }
 259         }
 260
 261         return -1;
 262 }
 263
 264
 265 static struct wmm_ac_addts_request *
 266 wmm_ac_build_addts_req(struct wpa_supplicant *wpa_s,
 267                        const struct wmm_ac_ts_setup_params *params,
 268                        const u8 *address)
 269 {
 270         struct wmm_ac_addts_request *addts_req;
 271         struct wmm_tspec_element *tspec;
 272         u8 ac = up_to_ac[params->user_priority];
 273         u8 uapsd = wpa_s->wmm_ac_assoc_info->ac_params[ac].uapsd;
 274
 275         addts_req = os_zalloc(sizeof(*addts_req));
 276         if (!addts_req)
 277                 return NULL;
 278
 279         tspec = &addts_req->tspec;
 280         os_memcpy(addts_req->address, address, ETH_ALEN);
 281
 282         /* The dialog token cannot be zero */
 283         if (++wpa_s->wmm_ac_last_dialog_token == 0)
 284                 wpa_s->wmm_ac_last_dialog_token++;
 285
 286         addts_req->dialog_token = wpa_s->wmm_ac_last_dialog_token;
 287         tspec->eid = WLAN_EID_VENDOR_SPECIFIC;
 288         tspec->length = sizeof(*tspec) - 2; /* reduce eid and length */
 289         tspec->oui[0] = 0x00;
 290         tspec->oui[1] = 0x50;
 291         tspec->oui[2] = 0xf2;
 292         tspec->oui_type = WMM_OUI_TYPE;
 293         tspec->oui_subtype = WMM_OUI_SUBTYPE_TSPEC_ELEMENT;
 294         tspec->version = WMM_VERSION;
 295
 296         tspec->ts_info[0] = params->tsid << 1;
 297         tspec->ts_info[0] |= params->direction << 5;
 298         tspec->ts_info[0] |= WMM_AC_ACCESS_POLICY_EDCA << 7;
 299         tspec->ts_info[1] = uapsd << 2;
 300         tspec->ts_info[1] |= params->user_priority << 3;
 301         tspec->ts_info[2] = 0;
 302
 303         tspec->nominal_msdu_size = host_to_le16(params->nominal_msdu_size);
 304         if (params->fixed_nominal_msdu)
 305                 tspec->nominal_msdu_size |=
 306                         host_to_le16(WMM_AC_FIXED_MSDU_SIZE);
 307
 308         tspec->mean_data_rate = host_to_le32(params->mean_data_rate);
 309         tspec->minimum_phy_rate = host_to_le32(params->minimum_phy_rate);
 310         tspec->surplus_bandwidth_allowance =
 311                 host_to_le16(params->surplus_bandwidth_allowance);
 312
 313         return addts_req;
 314 }
 315
 316
 317 static int param_in_range(const char *name, long value,
 318                           long min_val, long max_val)
 319 {
 320         if (value < min_val || (max_val >= 0 && value > max_val)) {
 321                 wpa_printf(MSG_DEBUG,
 322                            "WMM AC: param %s (%ld) is out of range (%ld-%ld)",
 323                            name, value, min_val, max_val);
 324                 return 0;
 325         }
 326
 327         return 1;
 328 }
 329
 330
 331 static int wmm_ac_should_replace_ts(struct wpa_supplicant *wpa_s,
 332                                     u8 tsid, u8 ac, u8 dir)
 333 {
 334         enum ts_dir_idx idx;
 335         int cur_ac, existing_ts = 0, replace_ts = 0;
 336
 337         cur_ac = wmm_ac_find_tsid(wpa_s, tsid, &idx);
 338         if (cur_ac >= 0) {
 339                 if (cur_ac != ac) {
 340                         wpa_printf(MSG_DEBUG,
 341                                    "WMM AC: TSID %i already exists on different ac (%d)",
 342                                    tsid, cur_ac);
 343                         return -1;
 344                 }
 345
 346                 /* same tsid - this tspec will replace the current one */
 347                 replace_ts |= BIT(idx);
 348         }
 349
 350         for (idx = 0; idx < TS_DIR_IDX_COUNT; idx++) {
 351                 if (wpa_s->tspecs[ac][idx])
 352                         existing_ts |= BIT(idx);
 353         }
 354
 355         switch (dir) {
 356         case WMM_AC_DIR_UPLINK:
 357                 /* replace existing uplink/bidi tspecs */
 358                 replace_ts |= existing_ts & (BIT(TS_DIR_IDX_UPLINK) |
 359                                              BIT(TS_DIR_IDX_BIDI));
 360                 break;
 361         case WMM_AC_DIR_DOWNLINK:
 362                 /* replace existing downlink/bidi tspecs */
 363                 replace_ts |= existing_ts & (BIT(TS_DIR_IDX_DOWNLINK) |
 364                                              BIT(TS_DIR_IDX_BIDI));
 365                 break;
 366         case WMM_AC_DIR_BIDIRECTIONAL:
 367                 /* replace all existing tspecs */
 368                 replace_ts |= existing_ts;
 369                 break;
 370         default:
 371                 return -1;
 372         }
 373
 374         return replace_ts;
 375 }
 376
 377
 378 static int wmm_ac_ts_req_is_valid(struct wpa_supplicant *wpa_s,
 379                                   const struct wmm_ac_ts_setup_params *params)
 380 {
 381         enum wmm_ac req_ac;
 382
 383 #define PARAM_IN_RANGE(field, min_value, max_value) \
 384         param_in_range(#field, params->field, min_value, max_value)
 385
 386         if (!PARAM_IN_RANGE(tsid, 0, WMM_AC_MAX_TID) ||
 387             !PARAM_IN_RANGE(user_priority, 0, WMM_AC_MAX_USER_PRIORITY) ||
 388             !PARAM_IN_RANGE(nominal_msdu_size, 1, WMM_AC_MAX_NOMINAL_MSDU) ||
 389             !PARAM_IN_RANGE(mean_data_rate, 1, -1) ||
 390             !PARAM_IN_RANGE(minimum_phy_rate, 1, -1) ||
 391             !PARAM_IN_RANGE(surplus_bandwidth_allowance, WMM_AC_MIN_SBA_UNITY,
 392                             -1))
 393                 return 0;
 394 #undef PARAM_IN_RANGE
 395
 396         if (!(params->direction == WMM_TSPEC_DIRECTION_UPLINK ||
 397               params->direction == WMM_TSPEC_DIRECTION_DOWNLINK ||
 398               params->direction == WMM_TSPEC_DIRECTION_BI_DIRECTIONAL)) {
 399                 wpa_printf(MSG_DEBUG, "WMM AC: invalid TS direction: %d",
 400                            params->direction);
 401                 return 0;
 402         }
 403
 404         req_ac = up_to_ac[params->user_priority];
 405
 406         /* Requested accesss category must have acm */
 407         if (!wpa_s->wmm_ac_assoc_info->ac_params[req_ac].acm) {
 408                 wpa_printf(MSG_DEBUG, "WMM AC: AC %d is not ACM", req_ac);
 409                 return 0;
 410         }
 411
 412         if (wmm_ac_should_replace_ts(wpa_s, params->tsid, req_ac,
 413                                      params->direction) < 0)
 414                 return 0;
 415
 416         return 1;
 417 }
 418
 419
 420 static struct wmm_ac_assoc_data *
 421 wmm_ac_process_param_elem(struct wpa_supplicant *wpa_s, const u8 *ies,
 422                           size_t ies_len)
 423 {
 424         struct ieee802_11_elems elems;
 425         struct wmm_parameter_element *wmm_params;
 426         struct wmm_ac_assoc_data *assoc_data;
 427         int i;
 428
 429         /* Parsing WMM Parameter Element */
 430         if (ieee802_11_parse_elems(ies, ies_len, &elems, 1) != ParseOK) {
 431                 wpa_printf(MSG_DEBUG, "WMM AC: could not parse assoc ies");
 432                 return NULL;
 433         }
 434
 435         if (!elems.wmm) {
 436                 wpa_printf(MSG_DEBUG, "WMM AC: No WMM IE");
 437                 return NULL;
 438         }
 439
 440         if (elems.wmm_len != sizeof(*wmm_params)) {
 441                 wpa_printf(MSG_WARNING, "WMM AC: Invalid WMM ie length");
 442                 return NULL;
 443         }
 444
 445         wmm_params = (struct wmm_parameter_element *)(elems.wmm);
 446
 447         assoc_data = os_zalloc(sizeof(*assoc_data));
 448         if (!assoc_data)
 449                 return NULL;
 450
 451         for (i = 0; i < WMM_AC_NUM; i++)
 452                 assoc_data->ac_params[i].acm =
 453                         !!(wmm_params->ac[i].aci_aifsn & WMM_AC_ACM);
 454
 455         wpa_printf(MSG_DEBUG,
 456                    "WMM AC: AC mandatory: AC_BE=%u AC_BK=%u AC_VI=%u AC_VO=%u",
 457                    assoc_data->ac_params[WMM_AC_BE].acm,
 458                    assoc_data->ac_params[WMM_AC_BK].acm,
 459                    assoc_data->ac_params[WMM_AC_VI].acm,
 460                    assoc_data->ac_params[WMM_AC_VO].acm);
 461
 462         return assoc_data;
 463 }
 464
 465
 466 static int wmm_ac_init(struct wpa_supplicant *wpa_s, const u8 *ies,
 467                        size_t ies_len, const struct wmm_params *wmm_params)
 468 {
 469         struct wmm_ac_assoc_data *assoc_data;
 470         u8 ac;
 471
 472         if (wpa_s->wmm_ac_assoc_info) {
 473                 wpa_printf(MSG_ERROR, "WMM AC: Already initialized");
 474                 return -1;
 475         }
 476
 477         if (!ies) {
 478                 wpa_printf(MSG_ERROR, "WMM AC: Missing IEs");
 479                 return -1;
 480         }
 481
 482         if (!(wmm_params->info_bitmap & WMM_PARAMS_UAPSD_QUEUES_INFO)) {
 483                 wpa_printf(MSG_DEBUG, "WMM AC: Missing U-APSD configuration");
 484                 return -1;
 485         }
 486
 487         os_memset(wpa_s->tspecs, 0, sizeof(wpa_s->tspecs));
 488         wpa_s->wmm_ac_last_dialog_token = 0;
 489         wpa_s->addts_request = NULL;
 490
 491         assoc_data = wmm_ac_process_param_elem(wpa_s, ies, ies_len);
 492         if (!assoc_data)
 493                 return -1;
 494
 495         wpa_printf(MSG_DEBUG, "WMM AC: U-APSD queues=0x%x",
 496                    wmm_params->uapsd_queues);
 497
 498         for (ac = 0; ac < WMM_AC_NUM; ac++) {
 499                 assoc_data->ac_params[ac].uapsd =
 500                         !!(wmm_params->uapsd_queues & BIT(ac));
 501         }
 502
 503         wpa_s->wmm_ac_assoc_info = assoc_data;
 504         return 0;
 505 }
 506
 507
 508 static void wmm_ac_del_ts(struct wpa_supplicant *wpa_s, u8 ac, int dir_bitmap)
 509 {
 510         enum ts_dir_idx idx;
 511
 512         for (idx = 0; idx < TS_DIR_IDX_COUNT; idx++) {
 513                 if (!(dir_bitmap & BIT(idx)))
 514                         continue;
 515
 516                 wmm_ac_del_ts_idx(wpa_s, ac, idx);
 517         }
 518 }
 519
 520
 521 static void wmm_ac_deinit(struct wpa_supplicant *wpa_s)
 522 {
 523         int i;
 524
 525         for (i = 0; i < WMM_AC_NUM; i++)
 526                 wmm_ac_del_ts(wpa_s, i, TS_DIR_IDX_ALL);
 527
 528         /* delete pending add_ts requset */
 529         wmm_ac_del_req(wpa_s, 1);
 530
 531         os_free(wpa_s->wmm_ac_assoc_info);
 532         wpa_s->wmm_ac_assoc_info = NULL;
 533 }
 534
 535
 536 void wmm_ac_notify_assoc(struct wpa_supplicant *wpa_s, const u8 *ies,
 537                          size_t ies_len, const struct wmm_params *wmm_params)
 538 {
 539         if (wmm_ac_init(wpa_s, ies, ies_len, wmm_params))
 540                 return;
 541
 542         wpa_printf(MSG_DEBUG,
 543                    "WMM AC: Valid WMM association, WMM AC is enabled");
 544 }
 545
 546
 547 void wmm_ac_notify_disassoc(struct wpa_supplicant *wpa_s)
 548 {
 549         if (!wpa_s->wmm_ac_assoc_info)
 550                 return;
 551
 552         wmm_ac_deinit(wpa_s);
 553         wpa_printf(MSG_DEBUG, "WMM AC: WMM AC is disabled");
 554 }
 555
 556
 557 int wpas_wmm_ac_delts(struct wpa_supplicant *wpa_s, u8 tsid)
 558 {
 559         struct wmm_tspec_element *tspec;
 560         int ac;
 561         enum ts_dir_idx dir;
 562
 563         if (!wpa_s->wmm_ac_assoc_info) {
 564                 wpa_printf(MSG_DEBUG,
 565                            "WMM AC: Failed to delete TS, WMM AC is disabled");
 566                 return -1;
 567         }
 568
 569         ac = wmm_ac_find_tsid(wpa_s, tsid, &dir);
 570         if (ac < 0) {
 571                 wpa_printf(MSG_DEBUG, "WMM AC: TS does not exist");
 572                 return -1;
 573         }
 574
 575         tspec = wpa_s->tspecs[ac][dir];
 576         wmm_ac_send_delts(wpa_s, tspec, wpa_s->bssid);
 577
 578         wmm_ac_del_ts_idx(wpa_s, ac, dir);
 579
 580         return 0;
 581 }
 582
 583
 584 int wpas_wmm_ac_addts(struct wpa_supplicant *wpa_s,
 585                       struct wmm_ac_ts_setup_params *params)
 586 {
 587         struct wmm_ac_addts_request *addts_req;
 588
 589         if (!wpa_s->wmm_ac_assoc_info) {
 590                 wpa_printf(MSG_DEBUG,
 591                            "WMM AC: Cannot add TS - missing assoc data");
 592                 return -1;
 593         }
 594
 595         if (wpa_s->addts_request) {
 596                 wpa_printf(MSG_DEBUG,
 597                            "WMM AC: can't add TS - ADDTS request is already pending");
 598                 return -1;
 599         }
 600
 601         /*
 602          * we can setup downlink TS even without driver support.
 603          * however, we need driver support for the other directions.
 604          */
 605         if (params->direction != WMM_AC_DIR_DOWNLINK &&
 606             !wpa_s->wmm_ac_supported) {
 607                 wpa_printf(MSG_DEBUG,
 608                            "Cannot set uplink/bidi TS without driver support");
 609                 return -1;
 610         }
 611
 612         if (!wmm_ac_ts_req_is_valid(wpa_s, params))
 613                 return -1;
 614
 615         wpa_printf(MSG_DEBUG, "WMM AC: TS setup request (addr=" MACSTR
 616                    " tsid=%u user priority=%u direction=%d)",
 617                    MAC2STR(wpa_s->bssid), params->tsid,
 618                    params->user_priority, params->direction);
 619
 620         addts_req = wmm_ac_build_addts_req(wpa_s, params, wpa_s->bssid);
 621         if (!addts_req)
 622                 return -1;
 623
 624         if (wmm_ac_send_addts_request(wpa_s, addts_req))
 625                 goto err;
 626
 627         /* save as pending and set ADDTS resp timeout to 1 second */
 628         wpa_s->addts_request = addts_req;
 629         eloop_register_timeout(1, 0, wmm_ac_addts_req_timeout,
 630                                wpa_s, addts_req);
 631         return 0;
 632 err:
 633         os_free(addts_req);
 634         return -1;
 635 }
 636
 637
 638 static void wmm_ac_handle_delts(struct wpa_supplicant *wpa_s, const u8 *sa,
 639                                 const struct wmm_tspec_element *tspec)
 640 {
 641         int ac;
 642         u8 tsid;
 643         enum ts_dir_idx idx;
 644
 645         tsid = wmm_ac_get_tsid(tspec);
 646
 647         wpa_printf(MSG_DEBUG,
 648                    "WMM AC: DELTS frame has been received TSID=%u addr="
 649                    MACSTR, tsid, MAC2STR(sa));
 650
 651         ac = wmm_ac_find_tsid(wpa_s, tsid, &idx);
 652         if (ac < 0) {
 653                 wpa_printf(MSG_DEBUG,
 654                            "WMM AC: Ignoring DELTS frame - TSID does not exist");
 655                 return;
 656         }
 657
 658         wmm_ac_del_ts_idx(wpa_s, ac, idx);
 659
 660         wpa_printf(MSG_INFO,
 661                    "TS was deleted successfully (tsid=%u address=" MACSTR ")",
 662                    tsid, MAC2STR(sa));
 663 }
 664
 665
 666 static void wmm_ac_handle_addts_resp(struct wpa_supplicant *wpa_s, const u8 *sa,
 667                 const u8 resp_dialog_token, const u8 status_code,
 668                 const struct wmm_tspec_element *tspec)
 669 {
 670         struct wmm_ac_addts_request *req = wpa_s->addts_request;
 671         u8 ac, tsid, up, dir;
 672         int replace_tspecs;
 673
 674         tsid = wmm_ac_get_tsid(tspec);
 675         dir = wmm_ac_get_direction(tspec);
 676         up = wmm_ac_get_user_priority(tspec);
 677         ac = up_to_ac[up];
 678
 679         /* make sure we have a matching addts request */
 680         if (!req || req->dialog_token != resp_dialog_token) {
 681                 wpa_printf(MSG_ERROR,
 682                            "WMM AC: no req with dialog=%u, ignoring frame",
 683                            resp_dialog_token);
 684                 return;
 685         }
 686
 687         /* make sure the params are the same */
 688         if (os_memcmp(req->address, sa, ETH_ALEN) != 0 ||
 689             tsid != wmm_ac_get_tsid(&req->tspec) ||
 690             up != wmm_ac_get_user_priority(&req->tspec) ||
 691             dir != wmm_ac_get_direction(&req->tspec)) {
 692                 wpa_printf(MSG_ERROR,
 693                            "WMM AC: ADDTS params do not match, ignoring frame");
 694                 return;
 695         }
 696
 697         /* delete pending request */
 698         wmm_ac_del_req(wpa_s, 0);
 699
 700         wpa_printf(MSG_INFO,
 701                    "ADDTS response status=%d tsid=%u up=%u direction=%u",
 702                    status_code, tsid, up, dir);
 703
 704         if (status_code != WMM_ADDTS_STATUS_ADMISSION_ACCEPTED) {
 705                 wpa_printf(MSG_INFO, "WMM AC: ADDTS request was rejected");
 706                 goto err_msg;
 707         }
 708
 709         replace_tspecs = wmm_ac_should_replace_ts(wpa_s, tsid, ac, dir);
 710         if (replace_tspecs < 0)
 711                 goto err_delts;
 712
 713         wpa_printf(MSG_DEBUG, "ts idx replace bitmap: 0x%x", replace_tspecs);
 714
 715         /* when replacing tspecs - delete first */
 716         wmm_ac_del_ts(wpa_s, ac, replace_tspecs);
 717
 718         /* Creating a new traffic stream */
 719         wpa_printf(MSG_DEBUG,
 720                    "WMM AC: adding a new TS with TSID=%u address="MACSTR
 721                    " medium time=%u access category=%d dir=%d ",
 722                    tsid, MAC2STR(sa),
 723                    le_to_host16(tspec->medium_time), ac, dir);
 724
 725         if (wmm_ac_add_ts(wpa_s, sa, tspec))
 726                 goto err_delts;
 727
 728         return;
 729
 730 err_delts:
 731         /* ask the ap to delete the tspec */
 732         wmm_ac_send_delts(wpa_s, tspec, sa);
 733 err_msg:
 734         wpa_msg(wpa_s, MSG_INFO, WMM_AC_EVENT_TSPEC_REQ_FAILED "tsid=%u",
 735                 tsid);
 736 }
 737
 738
 739 void wmm_ac_rx_action(struct wpa_supplicant *wpa_s, const u8 *da,
 740                         const u8 *sa, const u8 *data, size_t len)
 741 {
 742         u8 action;
 743         u8 dialog_token;
 744         u8 status_code;
 745         struct ieee802_11_elems elems;
 746         struct wmm_tspec_element *tspec;
 747
 748         if (wpa_s->wmm_ac_assoc_info == NULL) {
 749                 wpa_printf(MSG_WARNING,
 750                            "WMM AC: WMM AC is disabled, ignoring action frame");
 751                 return;
 752         }
 753
 754         action = data[0];
 755
 756         if (action != WMM_ACTION_CODE_ADDTS_RESP &&
 757             action != WMM_ACTION_CODE_DELTS) {
 758                 wpa_printf(MSG_WARNING,
 759                            "WMM AC: Unknown action (%d), ignoring action frame",
 760                            action);
 761                 return;
 762         }
 763
 764         /* WMM AC action frame */
 765         if (os_memcmp(da, wpa_s->own_addr, ETH_ALEN) != 0) {
 766                 wpa_printf(MSG_DEBUG, "WMM AC: frame destination addr="MACSTR
 767                            " is other than ours, ignoring frame", MAC2STR(da));
 768                 return;
 769         }
 770
 771         if (os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
 772                 wpa_printf(MSG_DEBUG, "WMM AC: ignore frame with sa " MACSTR
 773                            " different other than our bssid", MAC2STR(da));
 774                 return;
 775         }
 776
 777         if (len < 2 + sizeof(struct wmm_tspec_element)) {
 778                 wpa_printf(MSG_DEBUG,
 779                            "WMM AC: Short ADDTS response ignored (len=%lu)",
 780                            (unsigned long) len);
 781                 return;
 782         }
 783
 784         data++;
 785         len--;
 786         dialog_token = data[0];
 787         status_code = data[1];
 788
 789         if (ieee802_11_parse_elems(data + 2, len - 2, &elems, 1) != ParseOK) {
 790                 wpa_printf(MSG_DEBUG,
 791                            "WMM AC: Could not parse WMM AC action from " MACSTR,
 792                            MAC2STR(sa));
 793                 return;
 794         }
 795
 796         /* the struct also contains the type and value, so decrease it */
 797         if (elems.wmm_tspec_len != sizeof(struct wmm_tspec_element) - 2) {
 798                 wpa_printf(MSG_DEBUG, "WMM AC: missing or wrong length TSPEC");
 799                 return;
 800         }
 801
 802         tspec = (struct wmm_tspec_element *)(elems.wmm_tspec - 2);
 803
 804         wpa_printf(MSG_DEBUG, "WMM AC: RX WMM AC Action from " MACSTR,
 805                    MAC2STR(sa));
 806         wpa_hexdump(MSG_MSGDUMP, "WMM AC: WMM AC Action content", data, len);
 807
 808         switch (action) {
 809         case WMM_ACTION_CODE_ADDTS_RESP:
 810                 wmm_ac_handle_addts_resp(wpa_s, sa, dialog_token, status_code,
 811                                          tspec);
 812                 break;
 813         case WMM_ACTION_CODE_DELTS:
 814                 wmm_ac_handle_delts(wpa_s, sa, tspec);
 815                 break;
 816         default:
 817                 break;
 818         }
 819 }