libeap/wpa_supplicant/wnm_sta.c

   1 /*
   2  * wpa_supplicant - WNM
   3  * Copyright (c) 2011-2013, Qualcomm Atheros, Inc.
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "utils/includes.h"
  10
  11 #include "utils/common.h"
  12 #include "common/ieee802_11_defs.h"
  13 #include "common/ieee802_11_common.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "rsn_supp/wpa.h"
  16 #include "wpa_supplicant_i.h"
  17 #include "driver_i.h"
  18 #include "scan.h"
  19 #include "ctrl_iface.h"
  20 #include "bss.h"
  21 #include "wnm_sta.h"
  22 #include "hs20_supplicant.h"
  23
  24 #define MAX_TFS_IE_LEN  1024
  25 #define WNM_MAX_NEIGHBOR_REPORT 10
  26
  27
  28 /* get the TFS IE from driver */
  29 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
  30                                    u16 *buf_len, enum wnm_oper oper)
  31 {
  32         wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
  33
  34         return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
  35 }
  36
  37
  38 /* set the TFS IE to driver */
  39 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
  40                                    const u8 *addr, u8 *buf, u16 *buf_len,
  41                                    enum wnm_oper oper)
  42 {
  43         wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
  44
  45         return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
  46 }
  47
  48
  49 /* MLME-SLEEPMODE.request */
  50 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
  51                                  u8 action, u16 intval, struct wpabuf *tfs_req)
  52 {
  53         struct ieee80211_mgmt *mgmt;
  54         int res;
  55         size_t len;
  56         struct wnm_sleep_element *wnmsleep_ie;
  57         u8 *wnmtfs_ie;
  58         u8 wnmsleep_ie_len;
  59         u16 wnmtfs_ie_len;  /* possibly multiple IE(s) */
  60         enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
  61                 WNM_SLEEP_TFS_REQ_IE_NONE;
  62
  63         wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
  64                    "action=%s to " MACSTR,
  65                    action == 0 ? "enter" : "exit",
  66                    MAC2STR(wpa_s->bssid));
  67
  68         /* WNM-Sleep Mode IE */
  69         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  70         wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
  71         if (wnmsleep_ie == NULL)
  72                 return -1;
  73         wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
  74         wnmsleep_ie->len = wnmsleep_ie_len - 2;
  75         wnmsleep_ie->action_type = action;
  76         wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
  77         wnmsleep_ie->intval = host_to_le16(intval);
  78         wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
  79                     (u8 *) wnmsleep_ie, wnmsleep_ie_len);
  80
  81         /* TFS IE(s) */
  82         if (tfs_req) {
  83                 wnmtfs_ie_len = wpabuf_len(tfs_req);
  84                 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
  85                 if (wnmtfs_ie == NULL) {
  86                         os_free(wnmsleep_ie);
  87                         return -1;
  88                 }
  89                 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
  90         } else {
  91                 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  92                 if (wnmtfs_ie == NULL) {
  93                         os_free(wnmsleep_ie);
  94                         return -1;
  95                 }
  96                 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
  97                                             tfs_oper)) {
  98                         wnmtfs_ie_len = 0;
  99                         os_free(wnmtfs_ie);
 100                         wnmtfs_ie = NULL;
 101                 }
 102         }
 103         wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
 104                     (u8 *) wnmtfs_ie, wnmtfs_ie_len);
 105
 106         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
 107         if (mgmt == NULL) {
 108                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
 109                            "WNM-Sleep Request action frame");
 110                 os_free(wnmsleep_ie);
 111                 os_free(wnmtfs_ie);
 112                 return -1;
 113         }
 114
 115         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 116         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 117         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 118         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 119                                            WLAN_FC_STYPE_ACTION);
 120         mgmt->u.action.category = WLAN_ACTION_WNM;
 121         mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
 122         mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
 123         os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
 124                   wnmsleep_ie_len);
 125         /* copy TFS IE here */
 126         if (wnmtfs_ie_len > 0) {
 127                 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
 128                           wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
 129         }
 130
 131         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
 132                 wnmtfs_ie_len;
 133
 134         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 135                                   wpa_s->own_addr, wpa_s->bssid,
 136                                   &mgmt->u.action.category, len, 0);
 137         if (res < 0)
 138                 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 139                            "(action=%d, intval=%d)", action, intval);
 140
 141         os_free(wnmsleep_ie);
 142         os_free(wnmtfs_ie);
 143         os_free(mgmt);
 144
 145         return res;
 146 }
 147
 148
 149 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
 150                                          u8 *tfsresp_ie_start,
 151                                          u8 *tfsresp_ie_end)
 152 {
 153         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
 154                          wpa_s->bssid, NULL, NULL);
 155         /* remove GTK/IGTK ?? */
 156
 157         /* set the TFS Resp IE(s) */
 158         if (tfsresp_ie_start && tfsresp_ie_end &&
 159             tfsresp_ie_end - tfsresp_ie_start >= 0) {
 160                 u16 tfsresp_ie_len;
 161                 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
 162                         tfsresp_ie_start;
 163                 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
 164                 /* pass the TFS Resp IE(s) to driver for processing */
 165                 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
 166                                             tfsresp_ie_start,
 167                                             &tfsresp_ie_len,
 168                                             WNM_SLEEP_TFS_RESP_IE_SET))
 169                         wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
 170         }
 171 }
 172
 173
 174 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
 175                                         const u8 *frm, u16 key_len_total)
 176 {
 177         u8 *ptr, *end;
 178         u8 gtk_len;
 179
 180         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,  wpa_s->bssid,
 181                          NULL, NULL);
 182
 183         /* Install GTK/IGTK */
 184
 185         /* point to key data field */
 186         ptr = (u8 *) frm + 1 + 2;
 187         end = ptr + key_len_total;
 188         wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
 189
 190         while (ptr + 1 < end) {
 191                 if (ptr + 2 + ptr[1] > end) {
 192                         wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
 193                                    "length");
 194                         if (end > ptr) {
 195                                 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
 196                                             ptr, end - ptr);
 197                         }
 198                         break;
 199                 }
 200                 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
 201                         if (ptr[1] < 11 + 5) {
 202                                 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
 203                                            "subelem");
 204                                 break;
 205                         }
 206                         gtk_len = *(ptr + 4);
 207                         if (ptr[1] < 11 + gtk_len ||
 208                             gtk_len < 5 || gtk_len > 32) {
 209                                 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
 210                                            "subelem");
 211                                 break;
 212                         }
 213                         wpa_wnmsleep_install_key(
 214                                 wpa_s->wpa,
 215                                 WNM_SLEEP_SUBELEM_GTK,
 216                                 ptr);
 217                         ptr += 13 + gtk_len;
 218 #ifdef CONFIG_IEEE80211W
 219                 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
 220                         if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
 221                                 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
 222                                            "subelem");
 223                                 break;
 224                         }
 225                         wpa_wnmsleep_install_key(wpa_s->wpa,
 226                                                  WNM_SLEEP_SUBELEM_IGTK, ptr);
 227                         ptr += 10 + WPA_IGTK_LEN;
 228 #endif /* CONFIG_IEEE80211W */
 229                 } else
 230                         break; /* skip the loop */
 231         }
 232 }
 233
 234
 235 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 236                                         const u8 *frm, int len)
 237 {
 238         /*
 239          * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
 240          * WNM-Sleep Mode IE | TFS Response IE
 241          */
 242         u8 *pos = (u8 *) frm; /* point to payload after the action field */
 243         u16 key_len_total;
 244         struct wnm_sleep_element *wnmsleep_ie = NULL;
 245         /* multiple TFS Resp IE (assuming consecutive) */
 246         u8 *tfsresp_ie_start = NULL;
 247         u8 *tfsresp_ie_end = NULL;
 248         size_t left;
 249
 250         if (len < 3)
 251                 return;
 252         key_len_total = WPA_GET_LE16(frm + 1);
 253
 254         wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
 255                    frm[0], key_len_total);
 256         left = len - 3;
 257         if (key_len_total > left) {
 258                 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
 259                 return;
 260         }
 261         pos += 3 + key_len_total;
 262         while (pos - frm < len) {
 263                 u8 ie_len = *(pos + 1);
 264                 if (pos + 2 + ie_len > frm + len) {
 265                         wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
 266                         break;
 267                 }
 268                 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
 269                 if (*pos == WLAN_EID_WNMSLEEP)
 270                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 271                 else if (*pos == WLAN_EID_TFS_RESP) {
 272                         if (!tfsresp_ie_start)
 273                                 tfsresp_ie_start = pos;
 274                         tfsresp_ie_end = pos;
 275                 } else
 276                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 277                 pos += ie_len + 2;
 278         }
 279
 280         if (!wnmsleep_ie) {
 281                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 282                 return;
 283         }
 284
 285         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 286             wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 287                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 288                            "frame (action=%d, intval=%d)",
 289                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 290                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
 291                         wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
 292                                                      tfsresp_ie_end);
 293                 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 294                         wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
 295                 }
 296         } else {
 297                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 298                            "(action=%d, intval=%d)",
 299                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 300                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
 301                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 302                                          wpa_s->bssid, NULL, NULL);
 303                 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
 304                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 305                                          wpa_s->bssid, NULL, NULL);
 306         }
 307 }
 308
 309
 310 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
 311 {
 312         int i;
 313
 314         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 315                 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
 316                 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
 317         }
 318
 319         wpa_s->wnm_num_neighbor_report = 0;
 320         os_free(wpa_s->wnm_neighbor_report_elements);
 321         wpa_s->wnm_neighbor_report_elements = NULL;
 322 }
 323
 324
 325 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
 326                                            u8 id, u8 elen, const u8 *pos)
 327 {
 328         switch (id) {
 329         case WNM_NEIGHBOR_TSF:
 330                 if (elen < 2 + 2) {
 331                         wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
 332                         break;
 333                 }
 334                 rep->tsf_offset = WPA_GET_LE16(pos);
 335                 rep->beacon_int = WPA_GET_LE16(pos + 2);
 336                 rep->tsf_present = 1;
 337                 break;
 338         case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
 339                 if (elen < 2) {
 340                         wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
 341                                    "country string");
 342                         break;
 343                 }
 344                 os_memcpy(rep->country, pos, 2);
 345                 rep->country_present = 1;
 346                 break;
 347         case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
 348                 if (elen < 1) {
 349                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
 350                                    "candidate");
 351                         break;
 352                 }
 353                 rep->preference = pos[0];
 354                 rep->preference_present = 1;
 355                 break;
 356         case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
 357                 rep->bss_term_tsf = WPA_GET_LE64(pos);
 358                 rep->bss_term_dur = WPA_GET_LE16(pos + 8);
 359                 rep->bss_term_present = 1;
 360                 break;
 361         case WNM_NEIGHBOR_BEARING:
 362                 if (elen < 8) {
 363                         wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
 364                                    "bearing");
 365                         break;
 366                 }
 367                 rep->bearing = WPA_GET_LE16(pos);
 368                 rep->distance = WPA_GET_LE32(pos + 2);
 369                 rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
 370                 rep->bearing_present = 1;
 371                 break;
 372         case WNM_NEIGHBOR_MEASUREMENT_PILOT:
 373                 if (elen < 1) {
 374                         wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
 375                                    "pilot");
 376                         break;
 377                 }
 378                 os_free(rep->meas_pilot);
 379                 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
 380                 if (rep->meas_pilot == NULL)
 381                         break;
 382                 rep->meas_pilot->measurement_pilot = pos[0];
 383                 rep->meas_pilot->subelem_len = elen - 1;
 384                 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
 385                 break;
 386         case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
 387                 if (elen < 5) {
 388                         wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
 389                                    "capabilities");
 390                         break;
 391                 }
 392                 os_memcpy(rep->rm_capab, pos, 5);
 393                 rep->rm_capab_present = 1;
 394                 break;
 395         case WNM_NEIGHBOR_MULTIPLE_BSSID:
 396                 if (elen < 1) {
 397                         wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
 398                         break;
 399                 }
 400                 os_free(rep->mul_bssid);
 401                 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
 402                 if (rep->mul_bssid == NULL)
 403                         break;
 404                 rep->mul_bssid->max_bssid_indicator = pos[0];
 405                 rep->mul_bssid->subelem_len = elen - 1;
 406                 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
 407                 break;
 408         }
 409 }
 410
 411
 412 static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
 413 {
 414         struct wpa_bss *bss = wpa_s->current_bss;
 415         const char *country = NULL;
 416
 417         if (bss) {
 418                 const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
 419
 420                 if (elem && elem[1] >= 2)
 421                         country = (const char *) (elem + 2);
 422         }
 423
 424         return ieee80211_chan_to_freq(country, op_class, chan);
 425 }
 426
 427
 428 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 429                                       const u8 *pos, u8 len,
 430                                       struct neighbor_report *rep)
 431 {
 432         u8 left = len;
 433
 434         if (left < 13) {
 435                 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
 436                 return;
 437         }
 438
 439         os_memcpy(rep->bssid, pos, ETH_ALEN);
 440         rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
 441         rep->regulatory_class = *(pos + 10);
 442         rep->channel_number = *(pos + 11);
 443         rep->phy_type = *(pos + 12);
 444
 445         pos += 13;
 446         left -= 13;
 447
 448         while (left >= 2) {
 449                 u8 id, elen;
 450
 451                 id = *pos++;
 452                 elen = *pos++;
 453                 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
 454                 left -= 2;
 455                 if (elen > left) {
 456                         wpa_printf(MSG_DEBUG,
 457                                    "WNM: Truncated neighbor report subelement");
 458                         break;
 459                 }
 460                 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
 461                 left -= elen;
 462                 pos += elen;
 463         }
 464
 465         rep->freq = wnm_nei_get_chan(wpa_s, rep->regulatory_class,
 466                                      rep->channel_number);
 467 }
 468
 469
 470 static struct wpa_bss *
 471 compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
 472 {
 473
 474         u8 i;
 475         struct wpa_bss *bss = wpa_s->current_bss;
 476         struct wpa_bss *target;
 477
 478         if (!bss)
 479                 return 0;
 480
 481         wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
 482                    MAC2STR(wpa_s->bssid), bss->level);
 483
 484         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 485                 struct neighbor_report *nei;
 486
 487                 nei = &wpa_s->wnm_neighbor_report_elements[i];
 488                 if (nei->preference_present && nei->preference == 0) {
 489                         wpa_printf(MSG_DEBUG, "Skip excluded BSS " MACSTR,
 490                                    MAC2STR(nei->bssid));
 491                         continue;
 492                 }
 493
 494                 target = wpa_bss_get_bssid(wpa_s, nei->bssid);
 495                 if (!target) {
 496                         wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
 497                                    " (pref %d) not found in scan results",
 498                                    MAC2STR(nei->bssid),
 499                                    nei->preference_present ? nei->preference :
 500                                    -1);
 501                         continue;
 502                 }
 503
 504                 if (bss->ssid_len != target->ssid_len ||
 505                     os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
 506                         /*
 507                          * TODO: Could consider allowing transition to another
 508                          * ESS if PMF was enabled for the association.
 509                          */
 510                         wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
 511                                    " (pref %d) in different ESS",
 512                                    MAC2STR(nei->bssid),
 513                                    nei->preference_present ? nei->preference :
 514                                    -1);
 515                         continue;
 516                 }
 517
 518                 if (target->level < bss->level && target->level < -80) {
 519                         wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
 520                                    " (pref %d) does not have sufficient signal level (%d)",
 521                                    MAC2STR(nei->bssid),
 522                                    nei->preference_present ? nei->preference :
 523                                    -1,
 524                                    target->level);
 525                         continue;
 526                 }
 527
 528                 wpa_printf(MSG_DEBUG,
 529                            "WNM: Found an acceptable preferred transition candidate BSS "
 530                            MACSTR " (RSSI %d)",
 531                            MAC2STR(nei->bssid), target->level);
 532                 return target;
 533         }
 534
 535         return NULL;
 536 }
 537
 538
 539 static void wnm_send_bss_transition_mgmt_resp(
 540         struct wpa_supplicant *wpa_s, u8 dialog_token,
 541         enum bss_trans_mgmt_status_code status, u8 delay,
 542         const u8 *target_bssid)
 543 {
 544         u8 buf[1000], *pos;
 545         struct ieee80211_mgmt *mgmt;
 546         size_t len;
 547         int res;
 548
 549         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
 550                    "to " MACSTR " dialog_token=%u status=%u delay=%d",
 551                    MAC2STR(wpa_s->bssid), dialog_token, status, delay);
 552         if (!wpa_s->current_bss) {
 553                 wpa_printf(MSG_DEBUG,
 554                            "WNM: Current BSS not known - drop response");
 555                 return;
 556         }
 557
 558         mgmt = (struct ieee80211_mgmt *) buf;
 559         os_memset(&buf, 0, sizeof(buf));
 560         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 561         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 562         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 563         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 564                                            WLAN_FC_STYPE_ACTION);
 565         mgmt->u.action.category = WLAN_ACTION_WNM;
 566         mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
 567         mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
 568         mgmt->u.action.u.bss_tm_resp.status_code = status;
 569         mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
 570         pos = mgmt->u.action.u.bss_tm_resp.variable;
 571         if (target_bssid) {
 572                 os_memcpy(pos, target_bssid, ETH_ALEN);
 573                 pos += ETH_ALEN;
 574         } else if (status == WNM_BSS_TM_ACCEPT) {
 575                 /*
 576                  * P802.11-REVmc clarifies that the Target BSSID field is always
 577                  * present when status code is zero, so use a fake value here if
 578                  * no BSSID is yet known.
 579                  */
 580                 os_memset(pos, 0, ETH_ALEN);
 581                 pos += ETH_ALEN;
 582         }
 583
 584         len = pos - (u8 *) &mgmt->u.action.category;
 585
 586         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 587                                   wpa_s->own_addr, wpa_s->bssid,
 588                                   &mgmt->u.action.category, len, 0);
 589         if (res < 0) {
 590                 wpa_printf(MSG_DEBUG,
 591                            "WNM: Failed to send BSS Transition Management Response");
 592         }
 593 }
 594
 595
 596 int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
 597 {
 598         struct wpa_bss *bss;
 599         struct wpa_ssid *ssid = wpa_s->current_ssid;
 600         enum bss_trans_mgmt_status_code status = WNM_BSS_TM_REJECT_UNSPECIFIED;
 601
 602         if (!wpa_s->wnm_neighbor_report_elements)
 603                 return 0;
 604
 605         if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
 606                               &wpa_s->scan_trigger_time)) {
 607                 wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
 608                 wnm_deallocate_memory(wpa_s);
 609                 return 0;
 610         }
 611
 612         if (!wpa_s->current_bss ||
 613             os_memcmp(wpa_s->wnm_cand_from_bss, wpa_s->current_bss->bssid,
 614                       ETH_ALEN) != 0) {
 615                 wpa_printf(MSG_DEBUG, "WNM: Stored BSS transition candidate list not from the current BSS - ignore it");
 616                 return 0;
 617         }
 618
 619         /* Compare the Neighbor Report and scan results */
 620         bss = compare_scan_neighbor_results(wpa_s);
 621         if (!bss) {
 622                 wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
 623                 status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
 624                 goto send_bss_resp_fail;
 625         }
 626
 627         /* Associate to the network */
 628         /* Send the BSS Management Response - Accept */
 629         if (wpa_s->wnm_reply) {
 630                 wpa_s->wnm_reply = 0;
 631                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 632                                                   wpa_s->wnm_dialog_token,
 633                                                   WNM_BSS_TM_ACCEPT,
 634                                                   0, bss->bssid);
 635         }
 636
 637         if (bss == wpa_s->current_bss) {
 638                 wpa_printf(MSG_DEBUG,
 639                            "WNM: Already associated with the preferred candidate");
 640                 return 1;
 641         }
 642
 643         wpa_s->reassociate = 1;
 644         wpa_supplicant_connect(wpa_s, bss, ssid);
 645         wnm_deallocate_memory(wpa_s);
 646         return 1;
 647
 648 send_bss_resp_fail:
 649         if (!reply_on_fail)
 650                 return 0;
 651
 652         /* Send reject response for all the failures */
 653
 654         if (wpa_s->wnm_reply) {
 655                 wpa_s->wnm_reply = 0;
 656                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 657                                                   wpa_s->wnm_dialog_token,
 658                                                   status, 0, NULL);
 659         }
 660         wnm_deallocate_memory(wpa_s);
 661
 662         return 0;
 663 }
 664
 665
 666 static int cand_pref_compar(const void *a, const void *b)
 667 {
 668         const struct neighbor_report *aa = a;
 669         const struct neighbor_report *bb = b;
 670
 671         if (!aa->preference_present && !bb->preference_present)
 672                 return 0;
 673         if (!aa->preference_present)
 674                 return 1;
 675         if (!bb->preference_present)
 676                 return -1;
 677         if (bb->preference > aa->preference)
 678                 return 1;
 679         if (bb->preference < aa->preference)
 680                 return -1;
 681         return 0;
 682 }
 683
 684
 685 static void wnm_sort_cand_list(struct wpa_supplicant *wpa_s)
 686 {
 687         if (!wpa_s->wnm_neighbor_report_elements)
 688                 return;
 689         qsort(wpa_s->wnm_neighbor_report_elements,
 690               wpa_s->wnm_num_neighbor_report, sizeof(struct neighbor_report),
 691               cand_pref_compar);
 692 }
 693
 694
 695 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
 696 {
 697         unsigned int i;
 698
 699         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
 700         if (!wpa_s->wnm_neighbor_report_elements)
 701                 return;
 702         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 703                 struct neighbor_report *nei;
 704
 705                 nei = &wpa_s->wnm_neighbor_report_elements[i];
 706                 wpa_printf(MSG_DEBUG, "%u: " MACSTR
 707                            " info=0x%x op_class=%u chan=%u phy=%u pref=%d freq=%d",
 708                            i, MAC2STR(nei->bssid), nei->bssid_info,
 709                            nei->regulatory_class,
 710                            nei->channel_number, nei->phy_type,
 711                            nei->preference_present ? nei->preference : -1,
 712                            nei->freq);
 713         }
 714 }
 715
 716
 717 static int chan_supported(struct wpa_supplicant *wpa_s, int freq)
 718 {
 719         unsigned int i;
 720
 721         for (i = 0; i < wpa_s->hw.num_modes; i++) {
 722                 struct hostapd_hw_modes *mode = &wpa_s->hw.modes[i];
 723                 int j;
 724
 725                 for (j = 0; j < mode->num_channels; j++) {
 726                         struct hostapd_channel_data *chan;
 727
 728                         chan = &mode->channels[j];
 729                         if (chan->freq == freq &&
 730                             !(chan->flag & HOSTAPD_CHAN_DISABLED))
 731                                 return 1;
 732                 }
 733         }
 734
 735         return 0;
 736 }
 737
 738
 739 static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
 740 {
 741         int *freqs;
 742         int num_freqs = 0;
 743         unsigned int i;
 744
 745         if (!wpa_s->wnm_neighbor_report_elements)
 746                 return;
 747
 748         if (wpa_s->hw.modes == NULL)
 749                 return;
 750
 751         os_free(wpa_s->next_scan_freqs);
 752         wpa_s->next_scan_freqs = NULL;
 753
 754         freqs = os_calloc(wpa_s->wnm_num_neighbor_report + 1, sizeof(int));
 755         if (freqs == NULL)
 756                 return;
 757
 758         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 759                 struct neighbor_report *nei;
 760
 761                 nei = &wpa_s->wnm_neighbor_report_elements[i];
 762                 if (nei->freq <= 0) {
 763                         wpa_printf(MSG_DEBUG,
 764                                    "WNM: Unknown neighbor operating frequency for "
 765                                    MACSTR " - scan all channels",
 766                                    MAC2STR(nei->bssid));
 767                         os_free(freqs);
 768                         return;
 769                 }
 770                 if (chan_supported(wpa_s, nei->freq))
 771                         add_freq(freqs, &num_freqs, nei->freq);
 772         }
 773
 774         if (num_freqs == 0) {
 775                 os_free(freqs);
 776                 return;
 777         }
 778
 779         wpa_printf(MSG_DEBUG,
 780                    "WNM: Scan %d frequencies based on transition candidate list",
 781                    num_freqs);
 782         wpa_s->next_scan_freqs = freqs;
 783 }
 784
 785
 786 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 787                                              const u8 *pos, const u8 *end,
 788                                              int reply)
 789 {
 790         unsigned int beacon_int;
 791         u8 valid_int;
 792
 793         if (pos + 5 > end)
 794                 return;
 795
 796         if (wpa_s->current_bss)
 797                 beacon_int = wpa_s->current_bss->beacon_int;
 798         else
 799                 beacon_int = 100; /* best guess */
 800
 801         wpa_s->wnm_dialog_token = pos[0];
 802         wpa_s->wnm_mode = pos[1];
 803         wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
 804         valid_int = pos[4];
 805         wpa_s->wnm_reply = reply;
 806
 807         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
 808                    "dialog_token=%u request_mode=0x%x "
 809                    "disassoc_timer=%u validity_interval=%u",
 810                    wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
 811                    wpa_s->wnm_dissoc_timer, valid_int);
 812
 813         pos += 5;
 814
 815         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 816                 if (pos + 12 > end) {
 817                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
 818                         return;
 819                 }
 820                 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
 821                 pos += 12; /* BSS Termination Duration */
 822         }
 823
 824         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
 825                 char url[256];
 826
 827                 if (pos + 1 > end || pos + 1 + pos[0] > end) {
 828                         wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
 829                                    "Management Request (URL)");
 830                         return;
 831                 }
 832                 os_memcpy(url, pos + 1, pos[0]);
 833                 url[pos[0]] = '\0';
 834                 pos += 1 + pos[0];
 835
 836                 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
 837                         wpa_sm_pmf_enabled(wpa_s->wpa),
 838                         wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
 839         }
 840
 841         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 842                 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
 843                         "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
 844                 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
 845                         /* TODO: mark current BSS less preferred for
 846                          * selection */
 847                         wpa_printf(MSG_DEBUG, "Trying to find another BSS");
 848                         wpa_supplicant_req_scan(wpa_s, 0, 0);
 849                 }
 850         }
 851
 852         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 853                 unsigned int valid_ms;
 854
 855                 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
 856                 wnm_deallocate_memory(wpa_s);
 857                 wpa_s->wnm_neighbor_report_elements = os_calloc(
 858                         WNM_MAX_NEIGHBOR_REPORT,
 859                         sizeof(struct neighbor_report));
 860                 if (wpa_s->wnm_neighbor_report_elements == NULL)
 861                         return;
 862
 863                 while (pos + 2 <= end &&
 864                        wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
 865                 {
 866                         u8 tag = *pos++;
 867                         u8 len = *pos++;
 868
 869                         wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
 870                                    tag);
 871                         if (pos + len > end) {
 872                                 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
 873                                 return;
 874                         }
 875                         if (tag == WLAN_EID_NEIGHBOR_REPORT) {
 876                                 struct neighbor_report *rep;
 877                                 rep = &wpa_s->wnm_neighbor_report_elements[
 878                                         wpa_s->wnm_num_neighbor_report];
 879                                 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
 880                         }
 881
 882                         pos += len;
 883                         wpa_s->wnm_num_neighbor_report++;
 884                 }
 885                 wnm_sort_cand_list(wpa_s);
 886                 wnm_dump_cand_list(wpa_s);
 887                 valid_ms = valid_int * beacon_int * 128 / 125;
 888                 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
 889                            valid_ms);
 890                 os_get_reltime(&wpa_s->wnm_cand_valid_until);
 891                 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
 892                 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
 893                 wpa_s->wnm_cand_valid_until.sec +=
 894                         wpa_s->wnm_cand_valid_until.usec / 1000000;
 895                 wpa_s->wnm_cand_valid_until.usec %= 1000000;
 896                 os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
 897
 898                 if (wpa_s->last_scan_res_used > 0) {
 899                         struct os_reltime now;
 900
 901                         os_get_reltime(&now);
 902                         if (!os_reltime_expired(&now, &wpa_s->last_scan, 10)) {
 903                                 wpa_printf(MSG_DEBUG,
 904                                            "WNM: Try to use recent scan results");
 905                                 if (wnm_scan_process(wpa_s, 0) > 0)
 906                                         return;
 907                                 wpa_printf(MSG_DEBUG,
 908                                            "WNM: No match in previous scan results - try a new scan");
 909                         }
 910                 }
 911
 912                 wnm_set_scan_freqs(wpa_s);
 913                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 914         } else if (reply) {
 915                 enum bss_trans_mgmt_status_code status;
 916                 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
 917                         status = WNM_BSS_TM_ACCEPT;
 918                 else {
 919                         wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
 920                         status = WNM_BSS_TM_REJECT_UNSPECIFIED;
 921                 }
 922                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 923                                                   wpa_s->wnm_dialog_token,
 924                                                   status, 0, NULL);
 925         }
 926 }
 927
 928
 929 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 930                                        u8 query_reason)
 931 {
 932         u8 buf[1000], *pos;
 933         struct ieee80211_mgmt *mgmt;
 934         size_t len;
 935         int ret;
 936
 937         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
 938                    MACSTR " query_reason=%u",
 939                    MAC2STR(wpa_s->bssid), query_reason);
 940
 941         mgmt = (struct ieee80211_mgmt *) buf;
 942         os_memset(&buf, 0, sizeof(buf));
 943         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 944         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 945         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 946         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 947                                            WLAN_FC_STYPE_ACTION);
 948         mgmt->u.action.category = WLAN_ACTION_WNM;
 949         mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
 950         mgmt->u.action.u.bss_tm_query.dialog_token = 1;
 951         mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 952         pos = mgmt->u.action.u.bss_tm_query.variable;
 953
 954         len = pos - (u8 *) &mgmt->u.action.category;
 955
 956         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 957                                   wpa_s->own_addr, wpa_s->bssid,
 958                                   &mgmt->u.action.category, len, 0);
 959
 960         return ret;
 961 }
 962
 963
 964 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
 965                                             const u8 *sa, const u8 *data,
 966                                             int len)
 967 {
 968         const u8 *pos, *end, *next;
 969         u8 ie, ie_len;
 970
 971         pos = data;
 972         end = data + len;
 973
 974         while (pos + 1 < end) {
 975                 ie = *pos++;
 976                 ie_len = *pos++;
 977                 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
 978                            ie, ie_len);
 979                 if (ie_len > end - pos) {
 980                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
 981                                    "subelement");
 982                         break;
 983                 }
 984                 next = pos + ie_len;
 985                 if (ie_len < 4) {
 986                         pos = next;
 987                         continue;
 988                 }
 989                 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
 990                            WPA_GET_BE24(pos), pos[3]);
 991
 992 #ifdef CONFIG_HS20
 993                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
 994                     WPA_GET_BE24(pos) == OUI_WFA &&
 995                     pos[3] == HS20_WNM_SUB_REM_NEEDED) {
 996                         /* Subscription Remediation subelement */
 997                         const u8 *ie_end;
 998                         u8 url_len;
 999                         char *url;
1000                         u8 osu_method;
1001
1002                         wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
1003                                    "subelement");
1004                         ie_end = pos + ie_len;
1005                         pos += 4;
1006                         url_len = *pos++;
1007                         if (url_len == 0) {
1008                                 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
1009                                 url = NULL;
1010                                 osu_method = 1;
1011                         } else {
1012                                 if (pos + url_len + 1 > ie_end) {
1013                                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
1014                                                    url_len,
1015                                                    (int) (ie_end - pos));
1016                                         break;
1017                                 }
1018                                 url = os_malloc(url_len + 1);
1019                                 if (url == NULL)
1020                                         break;
1021                                 os_memcpy(url, pos, url_len);
1022                                 url[url_len] = '\0';
1023                                 osu_method = pos[url_len];
1024                         }
1025                         hs20_rx_subscription_remediation(wpa_s, url,
1026                                                          osu_method);
1027                         os_free(url);
1028                         pos = next;
1029                         continue;
1030                 }
1031
1032                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
1033                     WPA_GET_BE24(pos) == OUI_WFA &&
1034                     pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
1035                         const u8 *ie_end;
1036                         u8 url_len;
1037                         char *url;
1038                         u8 code;
1039                         u16 reauth_delay;
1040
1041                         ie_end = pos + ie_len;
1042                         pos += 4;
1043                         code = *pos++;
1044                         reauth_delay = WPA_GET_LE16(pos);
1045                         pos += 2;
1046                         url_len = *pos++;
1047                         wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
1048                                    "Imminent - Reason Code %u   "
1049                                    "Re-Auth Delay %u  URL Length %u",
1050                                    code, reauth_delay, url_len);
1051                         if (pos + url_len > ie_end)
1052                                 break;
1053                         url = os_malloc(url_len + 1);
1054                         if (url == NULL)
1055                                 break;
1056                         os_memcpy(url, pos, url_len);
1057                         url[url_len] = '\0';
1058                         hs20_rx_deauth_imminent_notice(wpa_s, code,
1059                                                        reauth_delay, url);
1060                         os_free(url);
1061                         pos = next;
1062                         continue;
1063                 }
1064 #endif /* CONFIG_HS20 */
1065
1066                 pos = next;
1067         }
1068 }
1069
1070
1071 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
1072                                         const u8 *sa, const u8 *frm, int len)
1073 {
1074         const u8 *pos, *end;
1075         u8 dialog_token, type;
1076
1077         /* Dialog Token [1] | Type [1] | Subelements */
1078
1079         if (len < 2 || sa == NULL)
1080                 return;
1081         end = frm + len;
1082         pos = frm;
1083         dialog_token = *pos++;
1084         type = *pos++;
1085
1086         wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
1087                 "(dialog_token %u type %u sa " MACSTR ")",
1088                 dialog_token, type, MAC2STR(sa));
1089         wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
1090                     pos, end - pos);
1091
1092         if (wpa_s->wpa_state != WPA_COMPLETED ||
1093             os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
1094                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
1095                         "from our AP - ignore it");
1096                 return;
1097         }
1098
1099         switch (type) {
1100         case 1:
1101                 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
1102                 break;
1103         default:
1104                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
1105                         "WNM-Notification type %u", type);
1106                 break;
1107         }
1108 }
1109
1110
1111 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
1112                               const struct ieee80211_mgmt *mgmt, size_t len)
1113 {
1114         const u8 *pos, *end;
1115         u8 act;
1116
1117         if (len < IEEE80211_HDRLEN + 2)
1118                 return;
1119
1120         pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
1121         act = *pos++;
1122         end = ((const u8 *) mgmt) + len;
1123
1124         wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
1125                    act, MAC2STR(mgmt->sa));
1126         if (wpa_s->wpa_state < WPA_ASSOCIATED ||
1127             os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
1128                 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
1129                            "frame");
1130                 return;
1131         }
1132
1133         switch (act) {
1134         case WNM_BSS_TRANS_MGMT_REQ:
1135                 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
1136                                                  !(mgmt->da[0] & 0x01));
1137                 break;
1138         case WNM_SLEEP_MODE_RESP:
1139                 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
1140                 break;
1141         case WNM_NOTIFICATION_REQ:
1142                 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
1143                 break;
1144         default:
1145                 wpa_printf(MSG_ERROR, "WNM: Unknown request");
1146                 break;
1147         }
1148 }