wpa_supplicant/mbo.c

   1 /*
   2  * wpa_supplicant - MBO
   3  *
   4  * Copyright(c) 2015 Intel Deutschland GmbH
   5  * Contact Information:
   6  * Intel Linux Wireless <ilw@linux.intel.com>
   7  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   8  *
   9  * This software may be distributed under the terms of the BSD license.
  10  * See README for more details.
  11  */
  12
  13 #include "utils/includes.h"
  14
  15 #include "utils/common.h"
  16 #include "common/ieee802_11_defs.h"
  17 #include "config.h"
  18 #include "wpa_supplicant_i.h"
  19 #include "driver_i.h"
  20 #include "bss.h"
  21
  22 /* type + length + oui + oui type */
  23 #define MBO_IE_HEADER 6
  24
  25
  26 static int wpas_mbo_validate_non_pref_chan(u8 oper_class, u8 chan, u8 reason)
  27 {
  28         if (reason > MBO_NON_PREF_CHAN_REASON_INT_INTERFERENCE)
  29                 return -1;
  30
  31         /* Only checking the validity of the channel and oper_class */
  32         if (ieee80211_chan_to_freq(NULL, oper_class, chan) == -1)
  33                 return -1;
  34
  35         return 0;
  36 }
  37
  38
  39 const u8 * wpas_mbo_get_bss_attr(struct wpa_bss *bss, enum mbo_attr_id attr)
  40 {
  41         const u8 *mbo, *end;
  42
  43         if (!bss)
  44                 return NULL;
  45
  46         mbo = wpa_bss_get_vendor_ie(bss, MBO_IE_VENDOR_TYPE);
  47         if (!mbo)
  48                 return NULL;
  49
  50         end = mbo + 2 + mbo[1];
  51         mbo += MBO_IE_HEADER;
  52
  53         return get_ie(mbo, end - mbo, attr);
  54 }
  55
  56
  57 static void wpas_mbo_non_pref_chan_attr_body(struct wpa_supplicant *wpa_s,
  58                                              struct wpabuf *mbo,
  59                                              u8 start, u8 end)
  60 {
  61         u8 i;
  62
  63         wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].oper_class);
  64
  65         for (i = start; i < end; i++)
  66                 wpabuf_put_u8(mbo, wpa_s->non_pref_chan[i].chan);
  67
  68         wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].preference);
  69         wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason);
  70         wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason_detail);
  71 }
  72
  73
  74 static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
  75                                         struct wpabuf *mbo, u8 start, u8 end)
  76 {
  77         size_t size = end - start + 4;
  78
  79         if (size + 2 > wpabuf_tailroom(mbo))
  80                 return;
  81
  82         wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
  83         wpabuf_put_u8(mbo, size); /* Length */
  84
  85         wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
  86 }
  87
  88
  89 static void wpas_mbo_non_pref_chan_subelem_hdr(struct wpabuf *mbo, u8 len)
  90 {
  91         wpabuf_put_u8(mbo, WLAN_EID_VENDOR_SPECIFIC);
  92         wpabuf_put_u8(mbo, len); /* Length */
  93         wpabuf_put_be24(mbo, OUI_WFA);
  94         wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
  95 }
  96
  97
  98 static void wpas_mbo_non_pref_chan_subelement(struct wpa_supplicant *wpa_s,
  99                                               struct wpabuf *mbo, u8 start,
 100                                               u8 end)
 101 {
 102         size_t size = end - start + 8;
 103
 104         if (size + 2 > wpabuf_tailroom(mbo))
 105                 return;
 106
 107         wpas_mbo_non_pref_chan_subelem_hdr(mbo, size);
 108         wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
 109 }
 110
 111
 112 static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
 113                                          struct wpabuf *mbo, int subelement)
 114 {
 115         u8 i, start = 0;
 116         struct wpa_mbo_non_pref_channel *start_pref;
 117
 118         if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num) {
 119                 if (subelement)
 120                         wpas_mbo_non_pref_chan_subelem_hdr(mbo, 4);
 121                 return;
 122         }
 123         start_pref = &wpa_s->non_pref_chan[0];
 124
 125         for (i = 1; i <= wpa_s->non_pref_chan_num; i++) {
 126                 struct wpa_mbo_non_pref_channel *non_pref = NULL;
 127
 128                 if (i < wpa_s->non_pref_chan_num)
 129                         non_pref = &wpa_s->non_pref_chan[i];
 130                 if (!non_pref ||
 131                     non_pref->oper_class != start_pref->oper_class ||
 132                     non_pref->reason != start_pref->reason ||
 133                     non_pref->reason_detail != start_pref->reason_detail ||
 134                     non_pref->preference != start_pref->preference) {
 135                         if (subelement)
 136                                 wpas_mbo_non_pref_chan_subelement(wpa_s, mbo,
 137                                                                   start, i);
 138                         else
 139                                 wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start,
 140                                                             i);
 141
 142                         if (!non_pref)
 143                                 return;
 144
 145                         start = i;
 146                         start_pref = non_pref;
 147                 }
 148         }
 149 }
 150
 151
 152 int wpas_mbo_ie(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
 153 {
 154         struct wpabuf *mbo;
 155         int res;
 156
 157         if (len < MBO_IE_HEADER + 3 + 7)
 158                 return 0;
 159
 160         /* Leave room for the MBO IE header */
 161         mbo = wpabuf_alloc(len - MBO_IE_HEADER);
 162         if (!mbo)
 163                 return 0;
 164
 165         /* Add non-preferred channels attribute */
 166         wpas_mbo_non_pref_chan_attrs(wpa_s, mbo, 0);
 167
 168         /*
 169          * Send cellular capabilities attribute even if AP does not advertise
 170          * cellular capabilities.
 171          */
 172         wpabuf_put_u8(mbo, MBO_ATTR_ID_CELL_DATA_CAPA);
 173         wpabuf_put_u8(mbo, 1);
 174         wpabuf_put_u8(mbo, wpa_s->conf->mbo_cell_capa);
 175
 176         res = mbo_add_ie(buf, len, wpabuf_head_u8(mbo), wpabuf_len(mbo));
 177         if (!res)
 178                 wpa_printf(MSG_ERROR, "Failed to add MBO IE");
 179
 180         wpabuf_free(mbo);
 181         return res;
 182 }
 183
 184
 185 static void wpas_mbo_send_wnm_notification(struct wpa_supplicant *wpa_s,
 186                                            const u8 *data, size_t len)
 187 {
 188         struct wpabuf *buf;
 189         int res;
 190
 191         /*
 192          * Send WNM-Notification Request frame only in case of a change in
 193          * non-preferred channels list during association, if the AP supports
 194          * MBO.
 195          */
 196         if (wpa_s->wpa_state != WPA_COMPLETED || !wpa_s->current_bss ||
 197             !wpa_bss_get_vendor_ie(wpa_s->current_bss, MBO_IE_VENDOR_TYPE))
 198                 return;
 199
 200         buf = wpabuf_alloc(4 + len);
 201         if (!buf)
 202                 return;
 203
 204         wpabuf_put_u8(buf, WLAN_ACTION_WNM);
 205         wpabuf_put_u8(buf, WNM_NOTIFICATION_REQ);
 206         wpa_s->mbo_wnm_token++;
 207         if (wpa_s->mbo_wnm_token == 0)
 208                 wpa_s->mbo_wnm_token++;
 209         wpabuf_put_u8(buf, wpa_s->mbo_wnm_token);
 210         wpabuf_put_u8(buf, WLAN_EID_VENDOR_SPECIFIC); /* Type */
 211
 212         wpabuf_put_data(buf, data, len);
 213
 214         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 215                                   wpa_s->own_addr, wpa_s->bssid,
 216                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 217         if (res < 0)
 218                 wpa_printf(MSG_DEBUG,
 219                            "Failed to send WNM-Notification Request frame with non-preferred channel list");
 220
 221         wpabuf_free(buf);
 222 }
 223
 224
 225 static void wpas_mbo_non_pref_chan_changed(struct wpa_supplicant *wpa_s)
 226 {
 227         struct wpabuf *buf;
 228
 229         buf = wpabuf_alloc(512);
 230         if (!buf)
 231                 return;
 232
 233         wpas_mbo_non_pref_chan_attrs(wpa_s, buf, 1);
 234         wpas_mbo_send_wnm_notification(wpa_s, wpabuf_head_u8(buf),
 235                                        wpabuf_len(buf));
 236         wpabuf_free(buf);
 237 }
 238
 239
 240 static int wpa_non_pref_chan_is_eq(struct wpa_mbo_non_pref_channel *a,
 241                                    struct wpa_mbo_non_pref_channel *b)
 242 {
 243         return a->oper_class == b->oper_class && a->chan == b->chan;
 244 }
 245
 246
 247 /*
 248  * wpa_non_pref_chan_cmp - Compare two channels for sorting
 249  *
 250  * In MBO IE non-preferred channel subelement we can put many channels in an
 251  * attribute if they are in the same operating class and have the same
 252  * preference, reason, and reason detail. To make it easy for the functions that
 253  * build the IE attributes and WNM Request subelements, save the channels sorted
 254  * by their oper_class, reason, and reason_detail.
 255  */
 256 static int wpa_non_pref_chan_cmp(const void *_a, const void *_b)
 257 {
 258         const struct wpa_mbo_non_pref_channel *a = _a, *b = _b;
 259
 260         if (a->oper_class != b->oper_class)
 261                 return a->oper_class - b->oper_class;
 262         if (a->reason != b->reason)
 263                 return a->reason - b->reason;
 264         if (a->reason_detail != b->reason_detail)
 265                 return a->reason_detail - b->reason_detail;
 266         return a->preference - b->preference;
 267 }
 268
 269
 270 int wpas_mbo_update_non_pref_chan(struct wpa_supplicant *wpa_s,
 271                                   const char *non_pref_chan)
 272 {
 273         char *cmd, *token, *context = NULL;
 274         struct wpa_mbo_non_pref_channel *chans = NULL, *tmp_chans;
 275         size_t num = 0, size = 0;
 276         unsigned i;
 277
 278         wpa_printf(MSG_DEBUG, "MBO: Update non-preferred channels, non_pref_chan=%s",
 279                    non_pref_chan ? non_pref_chan : "N/A");
 280
 281         /*
 282          * The shortest channel configuration is 10 characters - commas, 3
 283          * colons, and 4 values that one of them (oper_class) is 2 digits or
 284          * more.
 285          */
 286         if (!non_pref_chan || os_strlen(non_pref_chan) < 10)
 287                 goto update;
 288
 289         cmd = os_strdup(non_pref_chan);
 290         if (!cmd)
 291                 return -1;
 292
 293         while ((token = str_token(cmd, " ", &context))) {
 294                 struct wpa_mbo_non_pref_channel *chan;
 295                 int ret;
 296                 unsigned int _oper_class;
 297                 unsigned int _chan;
 298                 unsigned int _preference;
 299                 unsigned int _reason;
 300                 unsigned int _reason_detail;
 301
 302                 if (num == size) {
 303                         size = size ? size * 2 : 1;
 304                         tmp_chans = os_realloc_array(chans, size,
 305                                                      sizeof(*chans));
 306                         if (!tmp_chans) {
 307                                 wpa_printf(MSG_ERROR,
 308                                            "Couldn't reallocate non_pref_chan");
 309                                 goto fail;
 310                         }
 311                         chans = tmp_chans;
 312                 }
 313
 314                 chan = &chans[num];
 315
 316                 ret = sscanf(token, "%u:%u:%u:%u:%u", &_oper_class,
 317                              &_chan, &_preference, &_reason,
 318                              &_reason_detail);
 319                 if ((ret != 4 && ret != 5) ||
 320                     _oper_class > 255 || _chan > 255 ||
 321                     _preference > 255 || _reason > 65535 ||
 322                     (ret == 5 && _reason_detail > 255)) {
 323                         wpa_printf(MSG_ERROR, "Invalid non-pref chan input %s",
 324                                    token);
 325                         goto fail;
 326                 }
 327                 chan->oper_class = _oper_class;
 328                 chan->chan = _chan;
 329                 chan->preference = _preference;
 330                 chan->reason = _reason;
 331                 chan->reason_detail = ret == 4 ? 0 : _reason_detail;
 332
 333                 if (wpas_mbo_validate_non_pref_chan(chan->oper_class,
 334                                                     chan->chan, chan->reason)) {
 335                         wpa_printf(MSG_ERROR,
 336                                    "Invalid non_pref_chan: oper class %d chan %d reason %d",
 337                                    chan->oper_class, chan->chan, chan->reason);
 338                         goto fail;
 339                 }
 340
 341                 for (i = 0; i < num; i++)
 342                         if (wpa_non_pref_chan_is_eq(chan, &chans[i]))
 343                                 break;
 344                 if (i != num) {
 345                         wpa_printf(MSG_ERROR,
 346                                    "oper class %d chan %d is duplicated",
 347                                    chan->oper_class, chan->chan);
 348                         goto fail;
 349                 }
 350
 351                 num++;
 352         }
 353
 354         os_free(cmd);
 355
 356         if (chans) {
 357                 qsort(chans, num, sizeof(struct wpa_mbo_non_pref_channel),
 358                       wpa_non_pref_chan_cmp);
 359         }
 360
 361 update:
 362         os_free(wpa_s->non_pref_chan);
 363         wpa_s->non_pref_chan = chans;
 364         wpa_s->non_pref_chan_num = num;
 365         wpas_mbo_non_pref_chan_changed(wpa_s);
 366
 367         return 0;
 368
 369 fail:
 370         os_free(chans);
 371         os_free(cmd);
 372         return -1;
 373 }
 374
 375
 376 void wpas_mbo_scan_ie(struct wpa_supplicant *wpa_s, struct wpabuf *ie)
 377 {
 378         wpabuf_put_u8(ie, WLAN_EID_VENDOR_SPECIFIC);
 379         wpabuf_put_u8(ie, 7);
 380         wpabuf_put_be24(ie, OUI_WFA);
 381         wpabuf_put_u8(ie, MBO_OUI_TYPE);
 382
 383         wpabuf_put_u8(ie, MBO_ATTR_ID_CELL_DATA_CAPA);
 384         wpabuf_put_u8(ie, 1);
 385         wpabuf_put_u8(ie, wpa_s->conf->mbo_cell_capa);
 386 }
 387
 388
 389 enum chan_allowed {
 390         NOT_ALLOWED, ALLOWED
 391 };
 392
 393 static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
 394                                        unsigned int *flags)
 395 {
 396         int i;
 397
 398         for (i = 0; i < mode->num_channels; i++) {
 399                 if (mode->channels[i].chan == chan)
 400                         break;
 401         }
 402
 403         if (i == mode->num_channels ||
 404             (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
 405                 return NOT_ALLOWED;
 406
 407         if (flags)
 408                 *flags = mode->channels[i].flag;
 409
 410         return ALLOWED;
 411 }
 412
 413
 414 static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel)
 415 {
 416         u8 center_channels[] = {42, 58, 106, 122, 138, 155};
 417         size_t i;
 418
 419         if (mode->mode != HOSTAPD_MODE_IEEE80211A)
 420                 return 0;
 421
 422         for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
 423                 /*
 424                  * In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
 425                  * so the center channel is 6 channels away from the start/end.
 426                  */
 427                 if (channel >= center_channels[i] - 6 &&
 428                     channel <= center_channels[i] + 6)
 429                         return center_channels[i];
 430         }
 431
 432         return 0;
 433 }
 434
 435
 436 static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode, u8 channel)
 437 {
 438         u8 center_chan;
 439         unsigned int i;
 440
 441         center_chan = get_center_80mhz(mode, channel);
 442         if (!center_chan)
 443                 return NOT_ALLOWED;
 444
 445         /* check all the channels are available */
 446         for (i = 0; i < 4; i++) {
 447                 unsigned int flags;
 448                 u8 adj_chan = center_chan - 6 + i * 4;
 449
 450                 if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
 451                         return NOT_ALLOWED;
 452
 453                 if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) ||
 454                     (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
 455                     (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
 456                     (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
 457                         return NOT_ALLOWED;
 458         }
 459
 460         return ALLOWED;
 461 }
 462
 463
 464 static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel)
 465 {
 466         u8 center_channels[] = { 50, 114 };
 467         unsigned int i;
 468
 469         if (mode->mode != HOSTAPD_MODE_IEEE80211A)
 470                 return 0;
 471
 472         for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
 473                 /*
 474                  * In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
 475                  * so the center channel is 14 channels away from the start/end.
 476                  */
 477                 if (channel >= center_channels[i] - 14 &&
 478                     channel <= center_channels[i] + 14)
 479                         return center_channels[i];
 480         }
 481
 482         return 0;
 483 }
 484
 485
 486 static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
 487                                        u8 channel)
 488 {
 489         u8 center_chan;
 490         unsigned int i;
 491
 492         center_chan = get_center_160mhz(mode, channel);
 493         if (!center_chan)
 494                 return NOT_ALLOWED;
 495
 496         /* Check all the channels are available */
 497         for (i = 0; i < 8; i++) {
 498                 unsigned int flags;
 499                 u8 adj_chan = center_chan - 14 + i * 4;
 500
 501                 if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
 502                         return NOT_ALLOWED;
 503
 504                 if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) ||
 505                     (i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
 506                     (i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
 507                     (i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
 508                     (i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
 509                     (i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
 510                     (i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
 511                     (i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
 512                         return NOT_ALLOWED;
 513         }
 514
 515         return ALLOWED;
 516 }
 517
 518
 519 static enum chan_allowed verify_channel(struct hostapd_hw_modes *mode,
 520                                         u8 channel, u8 bw)
 521 {
 522         unsigned int flag = 0;
 523         enum chan_allowed res, res2;
 524
 525         res2 = res = allow_channel(mode, channel, &flag);
 526         if (bw == BW40MINUS) {
 527                 if (!(flag & HOSTAPD_CHAN_HT40MINUS))
 528                         return NOT_ALLOWED;
 529                 res2 = allow_channel(mode, channel - 4, NULL);
 530         } else if (bw == BW40PLUS) {
 531                 if (!(flag & HOSTAPD_CHAN_HT40PLUS))
 532                         return NOT_ALLOWED;
 533                 res2 = allow_channel(mode, channel + 4, NULL);
 534         } else if (bw == BW80) {
 535                 res2 = verify_80mhz(mode, channel);
 536         } else if (bw == BW160) {
 537                 res2 = verify_160mhz(mode, channel);
 538         }
 539
 540         if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
 541                 return NOT_ALLOWED;
 542
 543         return ALLOWED;
 544 }
 545
 546
 547 static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
 548                                    const struct oper_class_map *op_class)
 549 {
 550         int chan;
 551         size_t i;
 552         struct hostapd_hw_modes *mode;
 553
 554         mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode);
 555         if (!mode)
 556                 return 0;
 557
 558         if (op_class->op_class == 128 || op_class->op_class == 130) {
 559                 u8 channels[] = { 42, 58, 106, 122, 138, 155 };
 560
 561                 for (i = 0; i < ARRAY_SIZE(channels); i++) {
 562                         if (verify_channel(mode, channels[i], op_class->bw) ==
 563                             NOT_ALLOWED)
 564                                 return 0;
 565                 }
 566
 567                 return 1;
 568         }
 569
 570         if (op_class->op_class == 129) {
 571                 if (verify_channel(mode, 50, op_class->bw) == NOT_ALLOWED ||
 572                     verify_channel(mode, 114, op_class->bw) == NOT_ALLOWED)
 573                         return 0;
 574
 575                 return 1;
 576         }
 577
 578         for (chan = op_class->min_chan; chan <= op_class->max_chan;
 579              chan += op_class->inc) {
 580                 if (verify_channel(mode, chan, op_class->bw) == NOT_ALLOWED)
 581                         return 0;
 582         }
 583
 584         return 1;
 585 }
 586
 587
 588 int wpas_mbo_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
 589                               size_t len)
 590 {
 591         struct wpabuf *buf;
 592         u8 op, current, chan;
 593         u8 *ie_len;
 594         int res;
 595
 596         /*
 597          * Assume 20 MHz channel for now.
 598          * TODO: Use the secondary channel and VHT channel width that will be
 599          * used after association.
 600          */
 601         if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
 602                                           &current, &chan) == NUM_HOSTAPD_MODES)
 603                 return 0;
 604
 605         /*
 606          * Need 3 bytes for EID, length, and current operating class, plus
 607          * 1 byte for every other supported operating class.
 608          */
 609         buf = wpabuf_alloc(global_op_class_size + 3);
 610         if (!buf)
 611                 return 0;
 612
 613         wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
 614         /* Will set the length later, putting a placeholder */
 615         ie_len = wpabuf_put(buf, 1);
 616         wpabuf_put_u8(buf, current);
 617
 618         for (op = 0; global_op_class[op].op_class; op++) {
 619                 if (wpas_op_class_supported(wpa_s, &global_op_class[op]))
 620                         wpabuf_put_u8(buf, global_op_class[op].op_class);
 621         }
 622
 623         *ie_len = wpabuf_len(buf) - 2;
 624         if (*ie_len < 2 || wpabuf_len(buf) > len) {
 625                 wpa_printf(MSG_ERROR,
 626                            "Failed to add supported operating classes IE");
 627                 res = 0;
 628         } else {
 629                 os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
 630                 res = wpabuf_len(buf);
 631                 wpa_hexdump_buf(MSG_DEBUG,
 632                                 "MBO: Added supported operating classes IE",
 633                                 buf);
 634         }
 635
 636         wpabuf_free(buf);
 637         return res;
 638 }
 639
 640
 641 void wpas_mbo_ie_trans_req(struct wpa_supplicant *wpa_s, const u8 *mbo_ie,
 642                            size_t len)
 643 {
 644         const u8 *pos, *cell_pref = NULL, *reason = NULL;
 645         u8 id, elen;
 646         u16 disallowed_sec = 0;
 647
 648         if (len <= 4 || WPA_GET_BE24(mbo_ie) != OUI_WFA ||
 649             mbo_ie[3] != MBO_OUI_TYPE)
 650                 return;
 651
 652         pos = mbo_ie + 4;
 653         len -= 4;
 654
 655         while (len >= 2) {
 656                 id = *pos++;
 657                 elen = *pos++;
 658                 len -= 2;
 659
 660                 if (elen > len)
 661                         goto fail;
 662
 663                 switch (id) {
 664                 case MBO_ATTR_ID_CELL_DATA_PREF:
 665                         if (elen != 1)
 666                                 goto fail;
 667
 668                         if (wpa_s->conf->mbo_cell_capa ==
 669                             MBO_CELL_CAPA_AVAILABLE)
 670                                 cell_pref = pos;
 671                         else
 672                                 wpa_printf(MSG_DEBUG,
 673                                            "MBO: Station does not support Cellular data connection");
 674                         break;
 675                 case MBO_ATTR_ID_TRANSITION_REASON:
 676                         if (elen != 1)
 677                                 goto fail;
 678
 679                         reason = pos;
 680                         break;
 681                 case MBO_ATTR_ID_ASSOC_RETRY_DELAY:
 682                         if (elen != 2)
 683                                 goto fail;
 684
 685                         if (wpa_s->wnm_mode &
 686                             WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 687                                 wpa_printf(MSG_DEBUG,
 688                                            "MBO: Unexpected association retry delay, BSS is terminating");
 689                                 goto fail;
 690                         } else if (wpa_s->wnm_mode &
 691                                    WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 692                                 disallowed_sec = WPA_GET_LE16(pos);
 693                         } else {
 694                                 wpa_printf(MSG_DEBUG,
 695                                            "MBO: Association retry delay attribute not in disassoc imminent mode");
 696                         }
 697
 698                         break;
 699                 case MBO_ATTR_ID_AP_CAPA_IND:
 700                 case MBO_ATTR_ID_NON_PREF_CHAN_REPORT:
 701                 case MBO_ATTR_ID_CELL_DATA_CAPA:
 702                 case MBO_ATTR_ID_ASSOC_DISALLOW:
 703                 case MBO_ATTR_ID_TRANSITION_REJECT_REASON:
 704                         wpa_printf(MSG_DEBUG,
 705                                    "MBO: Attribute %d should not be included in BTM Request frame",
 706                                    id);
 707                         break;
 708                 default:
 709                         wpa_printf(MSG_DEBUG, "MBO: Unknown attribute id %u",
 710                                    id);
 711                         return;
 712                 }
 713
 714                 pos += elen;
 715                 len -= elen;
 716         }
 717
 718         if (cell_pref)
 719                 wpa_msg(wpa_s, MSG_INFO, MBO_CELL_PREFERENCE "preference=%u",
 720                         *cell_pref);
 721
 722         if (reason)
 723                 wpa_msg(wpa_s, MSG_INFO, MBO_TRANSITION_REASON "reason=%u",
 724                         *reason);
 725
 726         if (disallowed_sec && wpa_s->current_bss)
 727                 wpa_bss_tmp_disallow(wpa_s, wpa_s->current_bss->bssid,
 728                                      disallowed_sec);
 729
 730         return;
 731 fail:
 732         wpa_printf(MSG_DEBUG, "MBO IE parsing failed (id=%u len=%u left=%zu)",
 733                    id, elen, len);
 734 }
 735
 736
 737 size_t wpas_mbo_ie_bss_trans_reject(struct wpa_supplicant *wpa_s, u8 *pos,
 738                                     size_t len,
 739                                     enum mbo_transition_reject_reason reason)
 740 {
 741         u8 reject_attr[3];
 742
 743         reject_attr[0] = MBO_ATTR_ID_TRANSITION_REJECT_REASON;
 744         reject_attr[1] = 1;
 745         reject_attr[2] = reason;
 746
 747         return mbo_add_ie(pos, len, reject_attr, sizeof(reject_attr));
 748 }
 749
 750
 751 void wpas_mbo_update_cell_capa(struct wpa_supplicant *wpa_s, u8 mbo_cell_capa)
 752 {
 753         u8 cell_capa[7];
 754
 755         if (wpa_s->conf->mbo_cell_capa == mbo_cell_capa) {
 756                 wpa_printf(MSG_DEBUG,
 757                            "MBO: Cellular capability already set to %u",
 758                            mbo_cell_capa);
 759                 return;
 760         }
 761
 762         wpa_s->conf->mbo_cell_capa = mbo_cell_capa;
 763
 764         cell_capa[0] = WLAN_EID_VENDOR_SPECIFIC;
 765         cell_capa[1] = 5; /* Length */
 766         WPA_PUT_BE24(cell_capa + 2, OUI_WFA);
 767         cell_capa[5] = MBO_ATTR_ID_CELL_DATA_CAPA;
 768         cell_capa[6] = mbo_cell_capa;
 769
 770         wpas_mbo_send_wnm_notification(wpa_s, cell_capa, 7);
 771 }