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] | Diaglog 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 = le_to_host16(*((u16 *)(frm+2)));
 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         wpa_printf(MSG_DEBUG, "WNM-Sleep Mode Response token=%u key_len_total=%d",
 249                    frm[0], key_len_total);
 250         pos += 3 + key_len_total;
 251         if (pos > frm + len) {
 252                 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
 253                 return;
 254         }
 255         while (pos - frm < len) {
 256                 u8 ie_len = *(pos + 1);
 257                 if (pos + 2 + ie_len > frm + len) {
 258                         wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
 259                         break;
 260                 }
 261                 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
 262                 if (*pos == WLAN_EID_WNMSLEEP)
 263                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 264                 else if (*pos == WLAN_EID_TFS_RESP) {
 265                         if (!tfsresp_ie_start)
 266                                 tfsresp_ie_start = pos;
 267                         tfsresp_ie_end = pos;
 268                 } else
 269                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 270                 pos += ie_len + 2;
 271         }
 272
 273         if (!wnmsleep_ie) {
 274                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 275                 return;
 276         }
 277
 278         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 279             wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 280                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 281                            "frame (action=%d, intval=%d)",
 282                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 283                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
 284                         wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
 285                                                      tfsresp_ie_end);
 286                 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 287                         wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
 288                 }
 289         } else {
 290                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 291                            "(action=%d, intval=%d)",
 292                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 293                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
 294                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 295                                          wpa_s->bssid, NULL, NULL);
 296                 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
 297                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 298                                          wpa_s->bssid, NULL, NULL);
 299         }
 300 }
 301
 302
 303 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
 304 {
 305         int i;
 306
 307         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 308                 os_free(wpa_s->wnm_neighbor_report_elements[i].tsf_info);
 309                 os_free(wpa_s->wnm_neighbor_report_elements[i].con_coun_str);
 310                 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_tran_can);
 311                 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_term_dur);
 312                 os_free(wpa_s->wnm_neighbor_report_elements[i].bearing);
 313                 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
 314                 os_free(wpa_s->wnm_neighbor_report_elements[i].rrm_cap);
 315                 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
 316         }
 317
 318         os_free(wpa_s->wnm_neighbor_report_elements);
 319         wpa_s->wnm_neighbor_report_elements = NULL;
 320 }
 321
 322
 323 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
 324                                            u8 id, u8 elen, const u8 *pos)
 325 {
 326         switch (id) {
 327         case WNM_NEIGHBOR_TSF:
 328                 if (elen < 2 + 2) {
 329                         wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
 330                         break;
 331                 }
 332                 rep->tsf_info = os_zalloc(sizeof(struct tsf_info));
 333                 if (rep->tsf_info == NULL)
 334                         break;
 335                 rep->tsf_info->present = 1;
 336                 os_memcpy(rep->tsf_info->tsf_offset, pos, 2);
 337                 os_memcpy(rep->tsf_info->beacon_interval, pos + 2, 2);
 338                 break;
 339         case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
 340                 if (elen < 2) {
 341                         wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
 342                                    "country string");
 343                         break;
 344                 }
 345                 rep->con_coun_str =
 346                         os_zalloc(sizeof(struct condensed_country_string));
 347                 if (rep->con_coun_str == NULL)
 348                         break;
 349                 rep->con_coun_str->present = 1;
 350                 os_memcpy(rep->con_coun_str->country_string, pos, 2);
 351                 break;
 352         case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
 353                 if (elen < 1) {
 354                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
 355                                    "candidate");
 356                         break;
 357                 }
 358                 rep->bss_tran_can =
 359                         os_zalloc(sizeof(struct bss_transition_candidate));
 360                 if (rep->bss_tran_can == NULL)
 361                         break;
 362                 rep->bss_tran_can->present = 1;
 363                 rep->bss_tran_can->preference = pos[0];
 364                 break;
 365         case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
 366                 if (elen < 12) {
 367                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS termination "
 368                                    "duration");
 369                         break;
 370                 }
 371                 rep->bss_term_dur =
 372                         os_zalloc(sizeof(struct bss_termination_duration));
 373                 if (rep->bss_term_dur == NULL)
 374                         break;
 375                 rep->bss_term_dur->present = 1;
 376                 os_memcpy(rep->bss_term_dur->duration, pos, 12);
 377                 break;
 378         case WNM_NEIGHBOR_BEARING:
 379                 if (elen < 8) {
 380                         wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
 381                                    "bearing");
 382                         break;
 383                 }
 384                 rep->bearing = os_zalloc(sizeof(struct bearing));
 385                 if (rep->bearing == NULL)
 386                         break;
 387                 rep->bearing->present = 1;
 388                 os_memcpy(rep->bearing->bearing, pos, 8);
 389                 break;
 390         case WNM_NEIGHBOR_MEASUREMENT_PILOT:
 391                 if (elen < 2) {
 392                         wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
 393                                    "pilot");
 394                         break;
 395                 }
 396                 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
 397                 if (rep->meas_pilot == NULL)
 398                         break;
 399                 rep->meas_pilot->present = 1;
 400                 rep->meas_pilot->measurement_pilot = pos[0];
 401                 rep->meas_pilot->num_vendor_specific = pos[1];
 402                 os_memcpy(rep->meas_pilot->vendor_specific, pos + 2, elen - 2);
 403                 break;
 404         case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
 405                 if (elen < 4) {
 406                         wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
 407                                    "capabilities");
 408                         break;
 409                 }
 410                 rep->rrm_cap =
 411                         os_zalloc(sizeof(struct rrm_enabled_capabilities));
 412                 if (rep->rrm_cap == NULL)
 413                         break;
 414                 rep->rrm_cap->present = 1;
 415                 os_memcpy(rep->rrm_cap->capabilities, pos, 4);
 416                 break;
 417         case WNM_NEIGHBOR_MULTIPLE_BSSID:
 418                 if (elen < 2) {
 419                         wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
 420                         break;
 421                 }
 422                 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
 423                 if (rep->mul_bssid == NULL)
 424                         break;
 425                 rep->mul_bssid->present = 1;
 426                 rep->mul_bssid->max_bssid_indicator = pos[0];
 427                 rep->mul_bssid->num_vendor_specific = pos[1];
 428                 os_memcpy(rep->mul_bssid->vendor_specific, pos + 2, elen - 2);
 429                 break;
 430         }
 431 }
 432
 433
 434 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 435                                       const u8 *pos, u8 len,
 436                                       struct neighbor_report *rep)
 437 {
 438         u8 left = len;
 439
 440         if (left < 13) {
 441                 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
 442                 return;
 443         }
 444
 445         os_memcpy(rep->bssid, pos, ETH_ALEN);
 446         os_memcpy(rep->bssid_information, pos + ETH_ALEN, 4);
 447         rep->regulatory_class = *(pos + 10);
 448         rep->channel_number = *(pos + 11);
 449         rep->phy_type = *(pos + 12);
 450
 451         pos += 13;
 452         left -= 13;
 453
 454         while (left >= 2) {
 455                 u8 id, elen;
 456
 457                 id = *pos++;
 458                 elen = *pos++;
 459                 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
 460                 left -= 2 + elen;
 461                 pos += elen;
 462         }
 463 }
 464
 465
 466 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
 467                                          struct wpa_scan_results *scan_res,
 468                                          struct neighbor_report *neigh_rep,
 469                                          u8 num_neigh_rep, u8 *bssid_to_connect)
 470 {
 471
 472         u8 i, j;
 473
 474         if (scan_res == NULL || num_neigh_rep == 0 || !wpa_s->current_bss)
 475                 return 0;
 476
 477         wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
 478                    MAC2STR(wpa_s->bssid), wpa_s->current_bss->level);
 479
 480         for (i = 0; i < num_neigh_rep; i++) {
 481                 for (j = 0; j < scan_res->num; j++) {
 482                         /* Check for a better RSSI AP */
 483                         if (os_memcmp(scan_res->res[j]->bssid,
 484                                       neigh_rep[i].bssid, ETH_ALEN) == 0 &&
 485                             scan_res->res[j]->level >
 486                             wpa_s->current_bss->level) {
 487                                 /* Got a BSSID with better RSSI value */
 488                                 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
 489                                           ETH_ALEN);
 490                                 wpa_printf(MSG_DEBUG, "Found a BSS " MACSTR
 491                                            " with better scan RSSI %d",
 492                                            MAC2STR(scan_res->res[j]->bssid),
 493                                            scan_res->res[j]->level);
 494                                 return 1;
 495                         }
 496                         wpa_printf(MSG_DEBUG, "scan_res[%d] " MACSTR
 497                                    " RSSI %d", j,
 498                                    MAC2STR(scan_res->res[j]->bssid),
 499                                    scan_res->res[j]->level);
 500                 }
 501         }
 502
 503         return 0;
 504 }
 505
 506
 507 static void wnm_send_bss_transition_mgmt_resp(
 508         struct wpa_supplicant *wpa_s, u8 dialog_token,
 509         enum bss_trans_mgmt_status_code status, u8 delay,
 510         const u8 *target_bssid)
 511 {
 512         u8 buf[1000], *pos;
 513         struct ieee80211_mgmt *mgmt;
 514         size_t len;
 515
 516         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
 517                    "to " MACSTR " dialog_token=%u status=%u delay=%d",
 518                    MAC2STR(wpa_s->bssid), dialog_token, status, delay);
 519
 520         mgmt = (struct ieee80211_mgmt *) buf;
 521         os_memset(&buf, 0, sizeof(buf));
 522         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 523         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 524         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 525         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 526                                            WLAN_FC_STYPE_ACTION);
 527         mgmt->u.action.category = WLAN_ACTION_WNM;
 528         mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
 529         mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
 530         mgmt->u.action.u.bss_tm_resp.status_code = status;
 531         mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
 532         pos = mgmt->u.action.u.bss_tm_resp.variable;
 533         if (target_bssid) {
 534                 os_memcpy(pos, target_bssid, ETH_ALEN);
 535                 pos += ETH_ALEN;
 536         } else if (status == WNM_BSS_TM_ACCEPT) {
 537                 /*
 538                  * P802.11-REVmc clarifies that the Target BSSID field is always
 539                  * present when status code is zero, so use a fake value here if
 540                  * no BSSID is yet known.
 541                  */
 542                 os_memset(pos, 0, ETH_ALEN);
 543                 pos += ETH_ALEN;
 544         }
 545
 546         len = pos - (u8 *) &mgmt->u.action.category;
 547
 548         wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 549                             wpa_s->own_addr, wpa_s->bssid,
 550                             &mgmt->u.action.category, len, 0);
 551 }
 552
 553
 554 void wnm_scan_response(struct wpa_supplicant *wpa_s,
 555                        struct wpa_scan_results *scan_res)
 556 {
 557         u8 bssid[ETH_ALEN];
 558
 559         if (scan_res == NULL) {
 560                 wpa_printf(MSG_ERROR, "Scan result is NULL");
 561                 goto send_bss_resp_fail;
 562         }
 563
 564         /* Compare the Neighbor Report and scan results */
 565         if (compare_scan_neighbor_results(wpa_s, scan_res,
 566                                           wpa_s->wnm_neighbor_report_elements,
 567                                           wpa_s->wnm_num_neighbor_report,
 568                                           bssid) == 1) {
 569                 /* Associate to the network */
 570                 struct wpa_bss *bss;
 571                 struct wpa_ssid *ssid = wpa_s->current_ssid;
 572
 573                 bss = wpa_bss_get_bssid(wpa_s, bssid);
 574                 if (!bss) {
 575                         wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
 576                                    "BSS table");
 577                         goto send_bss_resp_fail;
 578                 }
 579
 580                 /* Send the BSS Management Response - Accept */
 581                 if (wpa_s->wnm_reply) {
 582                         wnm_send_bss_transition_mgmt_resp(wpa_s,
 583                                                   wpa_s->wnm_dialog_token,
 584                                                   WNM_BSS_TM_ACCEPT,
 585                                                   0, bssid);
 586                 }
 587
 588                 wpa_s->reassociate = 1;
 589                 wpa_supplicant_connect(wpa_s, bss, ssid);
 590                 wnm_deallocate_memory(wpa_s);
 591                 return;
 592         }
 593
 594         /* Send reject response for all the failures */
 595 send_bss_resp_fail:
 596         wnm_deallocate_memory(wpa_s);
 597         if (wpa_s->wnm_reply) {
 598                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 599                                                   wpa_s->wnm_dialog_token,
 600                                                   WNM_BSS_TM_REJECT_UNSPECIFIED,
 601                                                   0, NULL);
 602         }
 603         return;
 604 }
 605
 606
 607 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 608                                              const u8 *pos, const u8 *end,
 609                                              int reply)
 610 {
 611         if (pos + 5 > end)
 612                 return;
 613
 614         wpa_s->wnm_dialog_token = pos[0];
 615         wpa_s->wnm_mode = pos[1];
 616         wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
 617         wpa_s->wnm_validity_interval = pos[4];
 618         wpa_s->wnm_reply = reply;
 619
 620         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
 621                    "dialog_token=%u request_mode=0x%x "
 622                    "disassoc_timer=%u validity_interval=%u",
 623                    wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
 624                    wpa_s->wnm_dissoc_timer, wpa_s->wnm_validity_interval);
 625
 626         pos += 5;
 627
 628         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 629                 if (pos + 12 > end) {
 630                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
 631                         return;
 632                 }
 633                 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
 634                 pos += 12; /* BSS Termination Duration */
 635         }
 636
 637         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
 638                 char url[256];
 639                 unsigned int beacon_int;
 640
 641                 if (pos + 1 > end || pos + 1 + pos[0] > end) {
 642                         wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
 643                                    "Management Request (URL)");
 644                         return;
 645                 }
 646                 os_memcpy(url, pos + 1, pos[0]);
 647                 url[pos[0]] = '\0';
 648                 pos += 1 + pos[0];
 649
 650                 if (wpa_s->current_bss)
 651                         beacon_int = wpa_s->current_bss->beacon_int;
 652                 else
 653                         beacon_int = 100; /* best guess */
 654
 655                 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
 656                         wpa_sm_pmf_enabled(wpa_s->wpa),
 657                         wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
 658         }
 659
 660         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 661                 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
 662                         "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
 663                 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
 664                         /* TODO: mark current BSS less preferred for
 665                          * selection */
 666                         wpa_printf(MSG_DEBUG, "Trying to find another BSS");
 667                         wpa_supplicant_req_scan(wpa_s, 0, 0);
 668                 }
 669         }
 670
 671         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 672                 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
 673                 wpa_s->wnm_num_neighbor_report = 0;
 674                 os_free(wpa_s->wnm_neighbor_report_elements);
 675                 wpa_s->wnm_neighbor_report_elements = os_zalloc(
 676                         WNM_MAX_NEIGHBOR_REPORT *
 677                         sizeof(struct neighbor_report));
 678                 if (wpa_s->wnm_neighbor_report_elements == NULL)
 679                         return;
 680
 681                 while (pos + 2 <= end &&
 682                        wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
 683                 {
 684                         u8 tag = *pos++;
 685                         u8 len = *pos++;
 686
 687                         wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
 688                                    tag);
 689                         if (pos + len > end) {
 690                                 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
 691                                 return;
 692                         }
 693                         wnm_parse_neighbor_report(
 694                                 wpa_s, pos, len,
 695                                 &wpa_s->wnm_neighbor_report_elements[
 696                                         wpa_s->wnm_num_neighbor_report]);
 697
 698                         pos += len;
 699                         wpa_s->wnm_num_neighbor_report++;
 700                 }
 701
 702                 wpa_s->scan_res_handler = wnm_scan_response;
 703                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 704         } else if (reply) {
 705                 enum bss_trans_mgmt_status_code status;
 706                 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
 707                         status = WNM_BSS_TM_ACCEPT;
 708                 else {
 709                         wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
 710                         status = WNM_BSS_TM_REJECT_UNSPECIFIED;
 711                 }
 712                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 713                                                   wpa_s->wnm_dialog_token,
 714                                                   status, 0, NULL);
 715         }
 716 }
 717
 718
 719 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 720                                        u8 query_reason)
 721 {
 722         u8 buf[1000], *pos;
 723         struct ieee80211_mgmt *mgmt;
 724         size_t len;
 725         int ret;
 726
 727         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
 728                    MACSTR " query_reason=%u",
 729                    MAC2STR(wpa_s->bssid), query_reason);
 730
 731         mgmt = (struct ieee80211_mgmt *) buf;
 732         os_memset(&buf, 0, sizeof(buf));
 733         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 734         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 735         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 736         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 737                                            WLAN_FC_STYPE_ACTION);
 738         mgmt->u.action.category = WLAN_ACTION_WNM;
 739         mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
 740         mgmt->u.action.u.bss_tm_query.dialog_token = 1;
 741         mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 742         pos = mgmt->u.action.u.bss_tm_query.variable;
 743
 744         len = pos - (u8 *) &mgmt->u.action.category;
 745
 746         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 747                                   wpa_s->own_addr, wpa_s->bssid,
 748                                   &mgmt->u.action.category, len, 0);
 749
 750         return ret;
 751 }
 752
 753
 754 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
 755                                             const u8 *sa, const u8 *data,
 756                                             int len)
 757 {
 758         const u8 *pos, *end, *next;
 759         u8 ie, ie_len;
 760
 761         pos = data;
 762         end = data + len;
 763
 764         while (pos + 1 < end) {
 765                 ie = *pos++;
 766                 ie_len = *pos++;
 767                 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
 768                            ie, ie_len);
 769                 if (ie_len > end - pos) {
 770                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
 771                                    "subelement");
 772                         break;
 773                 }
 774                 next = pos + ie_len;
 775                 if (ie_len < 4) {
 776                         pos = next;
 777                         continue;
 778                 }
 779                 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
 780                            WPA_GET_BE24(pos), pos[3]);
 781
 782 #ifdef CONFIG_HS20
 783                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
 784                     WPA_GET_BE24(pos) == OUI_WFA &&
 785                     pos[3] == HS20_WNM_SUB_REM_NEEDED) {
 786                         /* Subscription Remediation subelement */
 787                         const u8 *ie_end;
 788                         u8 url_len;
 789                         char *url;
 790                         u8 osu_method;
 791
 792                         wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
 793                                    "subelement");
 794                         ie_end = pos + ie_len;
 795                         pos += 4;
 796                         url_len = *pos++;
 797                         if (url_len == 0) {
 798                                 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
 799                                 url = NULL;
 800                                 osu_method = 1;
 801                         } else {
 802                                 if (pos + url_len + 1 > ie_end) {
 803                                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
 804                                                    url_len,
 805                                                    (int) (ie_end - pos));
 806                                         break;
 807                                 }
 808                                 url = os_malloc(url_len + 1);
 809                                 if (url == NULL)
 810                                         break;
 811                                 os_memcpy(url, pos, url_len);
 812                                 url[url_len] = '\0';
 813                                 osu_method = pos[url_len];
 814                         }
 815                         hs20_rx_subscription_remediation(wpa_s, url,
 816                                                          osu_method);
 817                         os_free(url);
 818                         pos = next;
 819                         continue;
 820                 }
 821
 822                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
 823                     WPA_GET_BE24(pos) == OUI_WFA &&
 824                     pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
 825                         const u8 *ie_end;
 826                         u8 url_len;
 827                         char *url;
 828                         u8 code;
 829                         u16 reauth_delay;
 830
 831                         ie_end = pos + ie_len;
 832                         pos += 4;
 833                         code = *pos++;
 834                         reauth_delay = WPA_GET_LE16(pos);
 835                         pos += 2;
 836                         url_len = *pos++;
 837                         wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
 838                                    "Imminent - Reason Code %u   "
 839                                    "Re-Auth Delay %u  URL Length %u",
 840                                    code, reauth_delay, url_len);
 841                         if (pos + url_len > ie_end)
 842                                 break;
 843                         url = os_malloc(url_len + 1);
 844                         if (url == NULL)
 845                                 break;
 846                         os_memcpy(url, pos, url_len);
 847                         url[url_len] = '\0';
 848                         hs20_rx_deauth_imminent_notice(wpa_s, code,
 849                                                        reauth_delay, url);
 850                         os_free(url);
 851                         pos = next;
 852                         continue;
 853                 }
 854 #endif /* CONFIG_HS20 */
 855
 856                 pos = next;
 857         }
 858 }
 859
 860
 861 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
 862                                         const u8 *sa, const u8 *frm, int len)
 863 {
 864         const u8 *pos, *end;
 865         u8 dialog_token, type;
 866
 867         /* Dialog Token [1] | Type [1] | Subelements */
 868
 869         if (len < 2 || sa == NULL)
 870                 return;
 871         end = frm + len;
 872         pos = frm;
 873         dialog_token = *pos++;
 874         type = *pos++;
 875
 876         wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
 877                 "(dialog_token %u type %u sa " MACSTR ")",
 878                 dialog_token, type, MAC2STR(sa));
 879         wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
 880                     pos, end - pos);
 881
 882         if (wpa_s->wpa_state != WPA_COMPLETED ||
 883             os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
 884                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
 885                         "from our AP - ignore it");
 886                 return;
 887         }
 888
 889         switch (type) {
 890         case 1:
 891                 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
 892                 break;
 893         default:
 894                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
 895                         "WNM-Notification type %u", type);
 896                 break;
 897         }
 898 }
 899
 900
 901 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 902                               const struct ieee80211_mgmt *mgmt, size_t len)
 903 {
 904         const u8 *pos, *end;
 905         u8 act;
 906
 907         if (len < IEEE80211_HDRLEN + 2)
 908                 return;
 909
 910         pos = &mgmt->u.action.category;
 911         pos++;
 912         act = *pos++;
 913         end = ((const u8 *) mgmt) + len;
 914
 915         wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
 916                    act, MAC2STR(mgmt->sa));
 917         if (wpa_s->wpa_state < WPA_ASSOCIATED ||
 918             os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
 919                 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
 920                            "frame");
 921                 return;
 922         }
 923
 924         switch (act) {
 925         case WNM_BSS_TRANS_MGMT_REQ:
 926                 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
 927                                                  !(mgmt->da[0] & 0x01));
 928                 break;
 929         case WNM_SLEEP_MODE_RESP:
 930                 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
 931                 break;
 932         case WNM_NOTIFICATION_REQ:
 933                 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
 934                 break;
 935         default:
 936                 wpa_printf(MSG_ERROR, "WNM: Unknown request");
 937                 break;
 938         }
 939 }