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/wpa_ctrl.h"
  14 #include "rsn_supp/wpa.h"
  15 #include "wpa_supplicant_i.h"
  16 #include "driver_i.h"
  17 #include "scan.h"
  18 #include "ctrl_iface.h"
  19 #include "bss.h"
  20 #include "wnm_sta.h"
  21 #include "hs20_supplicant.h"
  22
  23 #define MAX_TFS_IE_LEN  1024
  24 #define WNM_MAX_NEIGHBOR_REPORT 10
  25
  26
  27 /* get the TFS IE from driver */
  28 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
  29                                    u16 *buf_len, enum wnm_oper oper)
  30 {
  31         wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
  32
  33         return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
  34 }
  35
  36
  37 /* set the TFS IE to driver */
  38 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
  39                                    const u8 *addr, u8 *buf, u16 *buf_len,
  40                                    enum wnm_oper oper)
  41 {
  42         wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
  43
  44         return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
  45 }
  46
  47
  48 /* MLME-SLEEPMODE.request */
  49 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
  50                                  u8 action, u16 intval, struct wpabuf *tfs_req)
  51 {
  52         struct ieee80211_mgmt *mgmt;
  53         int res;
  54         size_t len;
  55         struct wnm_sleep_element *wnmsleep_ie;
  56         u8 *wnmtfs_ie;
  57         u8 wnmsleep_ie_len;
  58         u16 wnmtfs_ie_len;  /* possibly multiple IE(s) */
  59         enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
  60                 WNM_SLEEP_TFS_REQ_IE_NONE;
  61
  62         wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
  63                    "action=%s to " MACSTR,
  64                    action == 0 ? "enter" : "exit",
  65                    MAC2STR(wpa_s->bssid));
  66
  67         /* WNM-Sleep Mode IE */
  68         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  69         wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
  70         if (wnmsleep_ie == NULL)
  71                 return -1;
  72         wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
  73         wnmsleep_ie->len = wnmsleep_ie_len - 2;
  74         wnmsleep_ie->action_type = action;
  75         wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
  76         wnmsleep_ie->intval = host_to_le16(intval);
  77         wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
  78                     (u8 *) wnmsleep_ie, wnmsleep_ie_len);
  79
  80         /* TFS IE(s) */
  81         if (tfs_req) {
  82                 wnmtfs_ie_len = wpabuf_len(tfs_req);
  83                 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
  84                 if (wnmtfs_ie == NULL) {
  85                         os_free(wnmsleep_ie);
  86                         return -1;
  87                 }
  88                 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
  89         } else {
  90                 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  91                 if (wnmtfs_ie == NULL) {
  92                         os_free(wnmsleep_ie);
  93                         return -1;
  94                 }
  95                 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
  96                                             tfs_oper)) {
  97                         wnmtfs_ie_len = 0;
  98                         os_free(wnmtfs_ie);
  99                         wnmtfs_ie = NULL;
 100                 }
 101         }
 102         wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
 103                     (u8 *) wnmtfs_ie, wnmtfs_ie_len);
 104
 105         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
 106         if (mgmt == NULL) {
 107                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
 108                            "WNM-Sleep Request action frame");
 109                 os_free(wnmsleep_ie);
 110                 os_free(wnmtfs_ie);
 111                 return -1;
 112         }
 113
 114         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 115         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 116         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 117         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 118                                            WLAN_FC_STYPE_ACTION);
 119         mgmt->u.action.category = WLAN_ACTION_WNM;
 120         mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
 121         mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
 122         os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
 123                   wnmsleep_ie_len);
 124         /* copy TFS IE here */
 125         if (wnmtfs_ie_len > 0) {
 126                 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
 127                           wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
 128         }
 129
 130         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
 131                 wnmtfs_ie_len;
 132
 133         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 134                                   wpa_s->own_addr, wpa_s->bssid,
 135                                   &mgmt->u.action.category, len, 0);
 136         if (res < 0)
 137                 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 138                            "(action=%d, intval=%d)", action, intval);
 139
 140         os_free(wnmsleep_ie);
 141         os_free(wnmtfs_ie);
 142         os_free(mgmt);
 143
 144         return res;
 145 }
 146
 147
 148 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
 149                                          u8 *tfsresp_ie_start,
 150                                          u8 *tfsresp_ie_end)
 151 {
 152         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
 153                          wpa_s->bssid, NULL, NULL);
 154         /* remove GTK/IGTK ?? */
 155
 156         /* set the TFS Resp IE(s) */
 157         if (tfsresp_ie_start && tfsresp_ie_end &&
 158             tfsresp_ie_end - tfsresp_ie_start >= 0) {
 159                 u16 tfsresp_ie_len;
 160                 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
 161                         tfsresp_ie_start;
 162                 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
 163                 /* pass the TFS Resp IE(s) to driver for processing */
 164                 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
 165                                             tfsresp_ie_start,
 166                                             &tfsresp_ie_len,
 167                                             WNM_SLEEP_TFS_RESP_IE_SET))
 168                         wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
 169         }
 170 }
 171
 172
 173 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
 174                                         const u8 *frm, u16 key_len_total)
 175 {
 176         u8 *ptr, *end;
 177         u8 gtk_len;
 178
 179         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,  wpa_s->bssid,
 180                          NULL, NULL);
 181
 182         /* Install GTK/IGTK */
 183
 184         /* point to key data field */
 185         ptr = (u8 *) frm + 1 + 2;
 186         end = ptr + key_len_total;
 187         wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
 188
 189         while (ptr + 1 < end) {
 190                 if (ptr + 2 + ptr[1] > end) {
 191                         wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
 192                                    "length");
 193                         if (end > ptr) {
 194                                 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
 195                                             ptr, end - ptr);
 196                         }
 197                         break;
 198                 }
 199                 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
 200                         if (ptr[1] < 11 + 5) {
 201                                 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
 202                                            "subelem");
 203                                 break;
 204                         }
 205                         gtk_len = *(ptr + 4);
 206                         if (ptr[1] < 11 + gtk_len ||
 207                             gtk_len < 5 || gtk_len > 32) {
 208                                 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
 209                                            "subelem");
 210                                 break;
 211                         }
 212                         wpa_wnmsleep_install_key(
 213                                 wpa_s->wpa,
 214                                 WNM_SLEEP_SUBELEM_GTK,
 215                                 ptr);
 216                         ptr += 13 + gtk_len;
 217 #ifdef CONFIG_IEEE80211W
 218                 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
 219                         if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
 220                                 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
 221                                            "subelem");
 222                                 break;
 223                         }
 224                         wpa_wnmsleep_install_key(wpa_s->wpa,
 225                                                  WNM_SLEEP_SUBELEM_IGTK, ptr);
 226                         ptr += 10 + WPA_IGTK_LEN;
 227 #endif /* CONFIG_IEEE80211W */
 228                 } else
 229                         break; /* skip the loop */
 230         }
 231 }
 232
 233
 234 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 235                                         const u8 *frm, int len)
 236 {
 237         /*
 238          * Action [1] | Dialog Token [1] | Key Data Len [2] | Key Data |
 239          * WNM-Sleep Mode IE | TFS Response IE
 240          */
 241         u8 *pos = (u8 *) frm; /* point to payload after the action field */
 242         u16 key_len_total;
 243         struct wnm_sleep_element *wnmsleep_ie = NULL;
 244         /* multiple TFS Resp IE (assuming consecutive) */
 245         u8 *tfsresp_ie_start = NULL;
 246         u8 *tfsresp_ie_end = NULL;
 247
 248         if (len < 3)
 249                 return;
 250         key_len_total = WPA_GET_LE16(frm + 1);
 251
 252         wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
 253                    frm[0], key_len_total);
 254         pos += 3 + key_len_total;
 255         if (pos > frm + len) {
 256                 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
 257                 return;
 258         }
 259         while (pos - frm < len) {
 260                 u8 ie_len = *(pos + 1);
 261                 if (pos + 2 + ie_len > frm + len) {
 262                         wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
 263                         break;
 264                 }
 265                 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
 266                 if (*pos == WLAN_EID_WNMSLEEP)
 267                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 268                 else if (*pos == WLAN_EID_TFS_RESP) {
 269                         if (!tfsresp_ie_start)
 270                                 tfsresp_ie_start = pos;
 271                         tfsresp_ie_end = pos;
 272                 } else
 273                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 274                 pos += ie_len + 2;
 275         }
 276
 277         if (!wnmsleep_ie) {
 278                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 279                 return;
 280         }
 281
 282         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 283             wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 284                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 285                            "frame (action=%d, intval=%d)",
 286                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 287                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
 288                         wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
 289                                                      tfsresp_ie_end);
 290                 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 291                         wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
 292                 }
 293         } else {
 294                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 295                            "(action=%d, intval=%d)",
 296                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 297                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
 298                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 299                                          wpa_s->bssid, NULL, NULL);
 300                 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
 301                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 302                                          wpa_s->bssid, NULL, NULL);
 303         }
 304 }
 305
 306
 307 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
 308 {
 309         int i;
 310
 311         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 312                 os_free(wpa_s->wnm_neighbor_report_elements[i].tsf_info);
 313                 os_free(wpa_s->wnm_neighbor_report_elements[i].con_coun_str);
 314                 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_tran_can);
 315                 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_term_dur);
 316                 os_free(wpa_s->wnm_neighbor_report_elements[i].bearing);
 317                 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
 318                 os_free(wpa_s->wnm_neighbor_report_elements[i].rrm_cap);
 319                 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
 320         }
 321
 322         wpa_s->wnm_num_neighbor_report = 0;
 323         os_free(wpa_s->wnm_neighbor_report_elements);
 324         wpa_s->wnm_neighbor_report_elements = NULL;
 325 }
 326
 327
 328 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
 329                                            u8 id, u8 elen, const u8 *pos)
 330 {
 331         switch (id) {
 332         case WNM_NEIGHBOR_TSF:
 333                 if (elen < 2 + 2) {
 334                         wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
 335                         break;
 336                 }
 337                 os_free(rep->tsf_info);
 338                 rep->tsf_info = os_zalloc(sizeof(struct tsf_info));
 339                 if (rep->tsf_info == NULL)
 340                         break;
 341                 os_memcpy(rep->tsf_info->tsf_offset, pos, 2);
 342                 os_memcpy(rep->tsf_info->beacon_interval, pos + 2, 2);
 343                 break;
 344         case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
 345                 if (elen < 2) {
 346                         wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
 347                                    "country string");
 348                         break;
 349                 }
 350                 os_free(rep->con_coun_str);
 351                 rep->con_coun_str =
 352                         os_zalloc(sizeof(struct condensed_country_string));
 353                 if (rep->con_coun_str == NULL)
 354                         break;
 355                 os_memcpy(rep->con_coun_str->country_string, pos, 2);
 356                 break;
 357         case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
 358                 if (elen < 1) {
 359                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
 360                                    "candidate");
 361                         break;
 362                 }
 363                 os_free(rep->bss_tran_can);
 364                 rep->bss_tran_can =
 365                         os_zalloc(sizeof(struct bss_transition_candidate));
 366                 if (rep->bss_tran_can == NULL)
 367                         break;
 368                 rep->bss_tran_can->preference = pos[0];
 369                 break;
 370         case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
 371                 if (elen < 10) {
 372                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS termination "
 373                                    "duration");
 374                         break;
 375                 }
 376                 os_free(rep->bss_term_dur);
 377                 rep->bss_term_dur =
 378                         os_zalloc(sizeof(struct bss_termination_duration));
 379                 if (rep->bss_term_dur == NULL)
 380                         break;
 381                 os_memcpy(rep->bss_term_dur->duration, pos, 10);
 382                 break;
 383         case WNM_NEIGHBOR_BEARING:
 384                 if (elen < 8) {
 385                         wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
 386                                    "bearing");
 387                         break;
 388                 }
 389                 os_free(rep->bearing);
 390                 rep->bearing = os_zalloc(sizeof(struct bearing));
 391                 if (rep->bearing == NULL)
 392                         break;
 393                 os_memcpy(rep->bearing->bearing, pos, 8);
 394                 break;
 395         case WNM_NEIGHBOR_MEASUREMENT_PILOT:
 396                 if (elen < 1) {
 397                         wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
 398                                    "pilot");
 399                         break;
 400                 }
 401                 os_free(rep->meas_pilot);
 402                 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
 403                 if (rep->meas_pilot == NULL)
 404                         break;
 405                 rep->meas_pilot->measurement_pilot = pos[0];
 406                 rep->meas_pilot->subelem_len = elen - 1;
 407                 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
 408                 break;
 409         case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
 410                 if (elen < 5) {
 411                         wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
 412                                    "capabilities");
 413                         break;
 414                 }
 415                 os_free(rep->rrm_cap);
 416                 rep->rrm_cap =
 417                         os_zalloc(sizeof(struct rrm_enabled_capabilities));
 418                 if (rep->rrm_cap == NULL)
 419                         break;
 420                 os_memcpy(rep->rrm_cap->capabilities, pos, 5);
 421                 break;
 422         case WNM_NEIGHBOR_MULTIPLE_BSSID:
 423                 if (elen < 1) {
 424                         wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
 425                         break;
 426                 }
 427                 os_free(rep->mul_bssid);
 428                 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
 429                 if (rep->mul_bssid == NULL)
 430                         break;
 431                 rep->mul_bssid->max_bssid_indicator = pos[0];
 432                 rep->mul_bssid->subelem_len = elen - 1;
 433                 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
 434                 break;
 435         }
 436 }
 437
 438
 439 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 440                                       const u8 *pos, u8 len,
 441                                       struct neighbor_report *rep)
 442 {
 443         u8 left = len;
 444
 445         if (left < 13) {
 446                 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
 447                 return;
 448         }
 449
 450         os_memcpy(rep->bssid, pos, ETH_ALEN);
 451         os_memcpy(rep->bssid_information, pos + ETH_ALEN, 4);
 452         rep->regulatory_class = *(pos + 10);
 453         rep->channel_number = *(pos + 11);
 454         rep->phy_type = *(pos + 12);
 455
 456         pos += 13;
 457         left -= 13;
 458
 459         while (left >= 2) {
 460                 u8 id, elen;
 461
 462                 id = *pos++;
 463                 elen = *pos++;
 464                 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
 465                 left -= 2;
 466                 if (elen > left) {
 467                         wpa_printf(MSG_DEBUG,
 468                                    "WNM: Truncated neighbor report subelement");
 469                         break;
 470                 }
 471                 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
 472                 left -= elen;
 473                 pos += elen;
 474         }
 475 }
 476
 477
 478 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
 479                                          struct wpa_scan_results *scan_res,
 480                                          struct neighbor_report *neigh_rep,
 481                                          u8 num_neigh_rep, u8 *bssid_to_connect)
 482 {
 483
 484         u8 i, j;
 485
 486         if (scan_res == NULL || num_neigh_rep == 0 || !wpa_s->current_bss)
 487                 return 0;
 488
 489         wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
 490                    MAC2STR(wpa_s->bssid), wpa_s->current_bss->level);
 491
 492         for (i = 0; i < num_neigh_rep; i++) {
 493                 for (j = 0; j < scan_res->num; j++) {
 494                         /* Check for a better RSSI AP */
 495                         if (os_memcmp(scan_res->res[j]->bssid,
 496                                       neigh_rep[i].bssid, ETH_ALEN) == 0 &&
 497                             scan_res->res[j]->level >
 498                             wpa_s->current_bss->level) {
 499                                 /* Got a BSSID with better RSSI value */
 500                                 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
 501                                           ETH_ALEN);
 502                                 wpa_printf(MSG_DEBUG, "Found a BSS " MACSTR
 503                                            " with better scan RSSI %d",
 504                                            MAC2STR(scan_res->res[j]->bssid),
 505                                            scan_res->res[j]->level);
 506                                 return 1;
 507                         }
 508                         wpa_printf(MSG_DEBUG, "scan_res[%d] " MACSTR
 509                                    " RSSI %d", j,
 510                                    MAC2STR(scan_res->res[j]->bssid),
 511                                    scan_res->res[j]->level);
 512                 }
 513         }
 514
 515         return 0;
 516 }
 517
 518
 519 static void wnm_send_bss_transition_mgmt_resp(
 520         struct wpa_supplicant *wpa_s, u8 dialog_token,
 521         enum bss_trans_mgmt_status_code status, u8 delay,
 522         const u8 *target_bssid)
 523 {
 524         u8 buf[1000], *pos;
 525         struct ieee80211_mgmt *mgmt;
 526         size_t len;
 527
 528         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
 529                    "to " MACSTR " dialog_token=%u status=%u delay=%d",
 530                    MAC2STR(wpa_s->bssid), dialog_token, status, delay);
 531
 532         mgmt = (struct ieee80211_mgmt *) buf;
 533         os_memset(&buf, 0, sizeof(buf));
 534         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 535         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 536         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 537         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 538                                            WLAN_FC_STYPE_ACTION);
 539         mgmt->u.action.category = WLAN_ACTION_WNM;
 540         mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
 541         mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
 542         mgmt->u.action.u.bss_tm_resp.status_code = status;
 543         mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
 544         pos = mgmt->u.action.u.bss_tm_resp.variable;
 545         if (target_bssid) {
 546                 os_memcpy(pos, target_bssid, ETH_ALEN);
 547                 pos += ETH_ALEN;
 548         } else if (status == WNM_BSS_TM_ACCEPT) {
 549                 /*
 550                  * P802.11-REVmc clarifies that the Target BSSID field is always
 551                  * present when status code is zero, so use a fake value here if
 552                  * no BSSID is yet known.
 553                  */
 554                 os_memset(pos, 0, ETH_ALEN);
 555                 pos += ETH_ALEN;
 556         }
 557
 558         len = pos - (u8 *) &mgmt->u.action.category;
 559
 560         wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 561                             wpa_s->own_addr, wpa_s->bssid,
 562                             &mgmt->u.action.category, len, 0);
 563 }
 564
 565
 566 void wnm_scan_response(struct wpa_supplicant *wpa_s,
 567                        struct wpa_scan_results *scan_res)
 568 {
 569         u8 bssid[ETH_ALEN];
 570
 571         if (scan_res == NULL) {
 572                 wpa_printf(MSG_ERROR, "Scan result is NULL");
 573                 goto send_bss_resp_fail;
 574         }
 575
 576         /* Compare the Neighbor Report and scan results */
 577         if (compare_scan_neighbor_results(wpa_s, scan_res,
 578                                           wpa_s->wnm_neighbor_report_elements,
 579                                           wpa_s->wnm_num_neighbor_report,
 580                                           bssid) == 1) {
 581                 /* Associate to the network */
 582                 struct wpa_bss *bss;
 583                 struct wpa_ssid *ssid = wpa_s->current_ssid;
 584
 585                 bss = wpa_bss_get_bssid(wpa_s, bssid);
 586                 if (!bss) {
 587                         wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
 588                                    "BSS table");
 589                         goto send_bss_resp_fail;
 590                 }
 591
 592                 /* Send the BSS Management Response - Accept */
 593                 if (wpa_s->wnm_reply) {
 594                         wnm_send_bss_transition_mgmt_resp(wpa_s,
 595                                                   wpa_s->wnm_dialog_token,
 596                                                   WNM_BSS_TM_ACCEPT,
 597                                                   0, bssid);
 598                 }
 599
 600                 wpa_s->reassociate = 1;
 601                 wpa_supplicant_connect(wpa_s, bss, ssid);
 602                 wnm_deallocate_memory(wpa_s);
 603                 return;
 604         }
 605
 606         /* Send reject response for all the failures */
 607 send_bss_resp_fail:
 608         wnm_deallocate_memory(wpa_s);
 609         if (wpa_s->wnm_reply) {
 610                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 611                                                   wpa_s->wnm_dialog_token,
 612                                                   WNM_BSS_TM_REJECT_UNSPECIFIED,
 613                                                   0, NULL);
 614         }
 615         return;
 616 }
 617
 618
 619 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 620                                              const u8 *pos, const u8 *end,
 621                                              int reply)
 622 {
 623         if (pos + 5 > end)
 624                 return;
 625
 626         wpa_s->wnm_dialog_token = pos[0];
 627         wpa_s->wnm_mode = pos[1];
 628         wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
 629         wpa_s->wnm_validity_interval = pos[4];
 630         wpa_s->wnm_reply = reply;
 631
 632         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
 633                    "dialog_token=%u request_mode=0x%x "
 634                    "disassoc_timer=%u validity_interval=%u",
 635                    wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
 636                    wpa_s->wnm_dissoc_timer, wpa_s->wnm_validity_interval);
 637
 638         pos += 5;
 639
 640         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 641                 if (pos + 12 > end) {
 642                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
 643                         return;
 644                 }
 645                 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
 646                 pos += 12; /* BSS Termination Duration */
 647         }
 648
 649         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
 650                 char url[256];
 651                 unsigned int beacon_int;
 652
 653                 if (pos + 1 > end || pos + 1 + pos[0] > end) {
 654                         wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
 655                                    "Management Request (URL)");
 656                         return;
 657                 }
 658                 os_memcpy(url, pos + 1, pos[0]);
 659                 url[pos[0]] = '\0';
 660                 pos += 1 + pos[0];
 661
 662                 if (wpa_s->current_bss)
 663                         beacon_int = wpa_s->current_bss->beacon_int;
 664                 else
 665                         beacon_int = 100; /* best guess */
 666
 667                 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
 668                         wpa_sm_pmf_enabled(wpa_s->wpa),
 669                         wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
 670         }
 671
 672         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 673                 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
 674                         "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
 675                 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
 676                         /* TODO: mark current BSS less preferred for
 677                          * selection */
 678                         wpa_printf(MSG_DEBUG, "Trying to find another BSS");
 679                         wpa_supplicant_req_scan(wpa_s, 0, 0);
 680                 }
 681         }
 682
 683         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 684                 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
 685                 wpa_s->wnm_num_neighbor_report = 0;
 686                 os_free(wpa_s->wnm_neighbor_report_elements);
 687                 wpa_s->wnm_neighbor_report_elements = os_zalloc(
 688                         WNM_MAX_NEIGHBOR_REPORT *
 689                         sizeof(struct neighbor_report));
 690                 if (wpa_s->wnm_neighbor_report_elements == NULL)
 691                         return;
 692
 693                 while (pos + 2 <= end &&
 694                        wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
 695                 {
 696                         u8 tag = *pos++;
 697                         u8 len = *pos++;
 698
 699                         wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
 700                                    tag);
 701                         if (pos + len > end) {
 702                                 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
 703                                 return;
 704                         }
 705                         if (tag == WLAN_EID_NEIGHBOR_REPORT) {
 706                                 struct neighbor_report *rep;
 707                                 rep = &wpa_s->wnm_neighbor_report_elements[
 708                                         wpa_s->wnm_num_neighbor_report];
 709                                 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
 710                         }
 711
 712                         pos += len;
 713                         wpa_s->wnm_num_neighbor_report++;
 714                 }
 715
 716                 wpa_s->scan_res_handler = wnm_scan_response;
 717                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 718         } else if (reply) {
 719                 enum bss_trans_mgmt_status_code status;
 720                 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
 721                         status = WNM_BSS_TM_ACCEPT;
 722                 else {
 723                         wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
 724                         status = WNM_BSS_TM_REJECT_UNSPECIFIED;
 725                 }
 726                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 727                                                   wpa_s->wnm_dialog_token,
 728                                                   status, 0, NULL);
 729         }
 730 }
 731
 732
 733 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 734                                        u8 query_reason)
 735 {
 736         u8 buf[1000], *pos;
 737         struct ieee80211_mgmt *mgmt;
 738         size_t len;
 739         int ret;
 740
 741         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
 742                    MACSTR " query_reason=%u",
 743                    MAC2STR(wpa_s->bssid), query_reason);
 744
 745         mgmt = (struct ieee80211_mgmt *) buf;
 746         os_memset(&buf, 0, sizeof(buf));
 747         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 748         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 749         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 750         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 751                                            WLAN_FC_STYPE_ACTION);
 752         mgmt->u.action.category = WLAN_ACTION_WNM;
 753         mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
 754         mgmt->u.action.u.bss_tm_query.dialog_token = 1;
 755         mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 756         pos = mgmt->u.action.u.bss_tm_query.variable;
 757
 758         len = pos - (u8 *) &mgmt->u.action.category;
 759
 760         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 761                                   wpa_s->own_addr, wpa_s->bssid,
 762                                   &mgmt->u.action.category, len, 0);
 763
 764         return ret;
 765 }
 766
 767
 768 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
 769                                             const u8 *sa, const u8 *data,
 770                                             int len)
 771 {
 772         const u8 *pos, *end, *next;
 773         u8 ie, ie_len;
 774
 775         pos = data;
 776         end = data + len;
 777
 778         while (pos + 1 < end) {
 779                 ie = *pos++;
 780                 ie_len = *pos++;
 781                 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
 782                            ie, ie_len);
 783                 if (ie_len > end - pos) {
 784                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
 785                                    "subelement");
 786                         break;
 787                 }
 788                 next = pos + ie_len;
 789                 if (ie_len < 4) {
 790                         pos = next;
 791                         continue;
 792                 }
 793                 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
 794                            WPA_GET_BE24(pos), pos[3]);
 795
 796 #ifdef CONFIG_HS20
 797                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
 798                     WPA_GET_BE24(pos) == OUI_WFA &&
 799                     pos[3] == HS20_WNM_SUB_REM_NEEDED) {
 800                         /* Subscription Remediation subelement */
 801                         const u8 *ie_end;
 802                         u8 url_len;
 803                         char *url;
 804                         u8 osu_method;
 805
 806                         wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
 807                                    "subelement");
 808                         ie_end = pos + ie_len;
 809                         pos += 4;
 810                         url_len = *pos++;
 811                         if (url_len == 0) {
 812                                 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
 813                                 url = NULL;
 814                                 osu_method = 1;
 815                         } else {
 816                                 if (pos + url_len + 1 > ie_end) {
 817                                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
 818                                                    url_len,
 819                                                    (int) (ie_end - pos));
 820                                         break;
 821                                 }
 822                                 url = os_malloc(url_len + 1);
 823                                 if (url == NULL)
 824                                         break;
 825                                 os_memcpy(url, pos, url_len);
 826                                 url[url_len] = '\0';
 827                                 osu_method = pos[url_len];
 828                         }
 829                         hs20_rx_subscription_remediation(wpa_s, url,
 830                                                          osu_method);
 831                         os_free(url);
 832                         pos = next;
 833                         continue;
 834                 }
 835
 836                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
 837                     WPA_GET_BE24(pos) == OUI_WFA &&
 838                     pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
 839                         const u8 *ie_end;
 840                         u8 url_len;
 841                         char *url;
 842                         u8 code;
 843                         u16 reauth_delay;
 844
 845                         ie_end = pos + ie_len;
 846                         pos += 4;
 847                         code = *pos++;
 848                         reauth_delay = WPA_GET_LE16(pos);
 849                         pos += 2;
 850                         url_len = *pos++;
 851                         wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
 852                                    "Imminent - Reason Code %u   "
 853                                    "Re-Auth Delay %u  URL Length %u",
 854                                    code, reauth_delay, url_len);
 855                         if (pos + url_len > ie_end)
 856                                 break;
 857                         url = os_malloc(url_len + 1);
 858                         if (url == NULL)
 859                                 break;
 860                         os_memcpy(url, pos, url_len);
 861                         url[url_len] = '\0';
 862                         hs20_rx_deauth_imminent_notice(wpa_s, code,
 863                                                        reauth_delay, url);
 864                         os_free(url);
 865                         pos = next;
 866                         continue;
 867                 }
 868 #endif /* CONFIG_HS20 */
 869
 870                 pos = next;
 871         }
 872 }
 873
 874
 875 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
 876                                         const u8 *sa, const u8 *frm, int len)
 877 {
 878         const u8 *pos, *end;
 879         u8 dialog_token, type;
 880
 881         /* Dialog Token [1] | Type [1] | Subelements */
 882
 883         if (len < 2 || sa == NULL)
 884                 return;
 885         end = frm + len;
 886         pos = frm;
 887         dialog_token = *pos++;
 888         type = *pos++;
 889
 890         wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
 891                 "(dialog_token %u type %u sa " MACSTR ")",
 892                 dialog_token, type, MAC2STR(sa));
 893         wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
 894                     pos, end - pos);
 895
 896         if (wpa_s->wpa_state != WPA_COMPLETED ||
 897             os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
 898                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
 899                         "from our AP - ignore it");
 900                 return;
 901         }
 902
 903         switch (type) {
 904         case 1:
 905                 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
 906                 break;
 907         default:
 908                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
 909                         "WNM-Notification type %u", type);
 910                 break;
 911         }
 912 }
 913
 914
 915 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 916                               const struct ieee80211_mgmt *mgmt, size_t len)
 917 {
 918         const u8 *pos, *end;
 919         u8 act;
 920
 921         if (len < IEEE80211_HDRLEN + 2)
 922                 return;
 923
 924         pos = &mgmt->u.action.category;
 925         pos++;
 926         act = *pos++;
 927         end = ((const u8 *) mgmt) + len;
 928
 929         wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
 930                    act, MAC2STR(mgmt->sa));
 931         if (wpa_s->wpa_state < WPA_ASSOCIATED ||
 932             os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
 933                 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
 934                            "frame");
 935                 return;
 936         }
 937
 938         switch (act) {
 939         case WNM_BSS_TRANS_MGMT_REQ:
 940                 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
 941                                                  !(mgmt->da[0] & 0x01));
 942                 break;
 943         case WNM_SLEEP_MODE_RESP:
 944                 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
 945                 break;
 946         case WNM_NOTIFICATION_REQ:
 947                 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
 948                 break;
 949         default:
 950                 wpa_printf(MSG_ERROR, "WNM: Unknown request");
 951                 break;
 952         }
 953 }