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                 rep->tsf_info->present = 1;
 342                 os_memcpy(rep->tsf_info->tsf_offset, pos, 2);
 343                 os_memcpy(rep->tsf_info->beacon_interval, pos + 2, 2);
 344                 break;
 345         case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
 346                 if (elen < 2) {
 347                         wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
 348                                    "country string");
 349                         break;
 350                 }
 351                 os_free(rep->con_coun_str);
 352                 rep->con_coun_str =
 353                         os_zalloc(sizeof(struct condensed_country_string));
 354                 if (rep->con_coun_str == NULL)
 355                         break;
 356                 rep->con_coun_str->present = 1;
 357                 os_memcpy(rep->con_coun_str->country_string, pos, 2);
 358                 break;
 359         case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
 360                 if (elen < 1) {
 361                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
 362                                    "candidate");
 363                         break;
 364                 }
 365                 os_free(rep->bss_tran_can);
 366                 rep->bss_tran_can =
 367                         os_zalloc(sizeof(struct bss_transition_candidate));
 368                 if (rep->bss_tran_can == NULL)
 369                         break;
 370                 rep->bss_tran_can->present = 1;
 371                 rep->bss_tran_can->preference = pos[0];
 372                 break;
 373         case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
 374                 if (elen < 12) {
 375                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS termination "
 376                                    "duration");
 377                         break;
 378                 }
 379                 os_free(rep->bss_term_dur);
 380                 rep->bss_term_dur =
 381                         os_zalloc(sizeof(struct bss_termination_duration));
 382                 if (rep->bss_term_dur == NULL)
 383                         break;
 384                 rep->bss_term_dur->present = 1;
 385                 os_memcpy(rep->bss_term_dur->duration, pos, 12);
 386                 break;
 387         case WNM_NEIGHBOR_BEARING:
 388                 if (elen < 8) {
 389                         wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
 390                                    "bearing");
 391                         break;
 392                 }
 393                 os_free(rep->bearing);
 394                 rep->bearing = os_zalloc(sizeof(struct bearing));
 395                 if (rep->bearing == NULL)
 396                         break;
 397                 rep->bearing->present = 1;
 398                 os_memcpy(rep->bearing->bearing, pos, 8);
 399                 break;
 400         case WNM_NEIGHBOR_MEASUREMENT_PILOT:
 401                 if (elen < 2) {
 402                         wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
 403                                    "pilot");
 404                         break;
 405                 }
 406                 os_free(rep->meas_pilot);
 407                 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
 408                 if (rep->meas_pilot == NULL)
 409                         break;
 410                 rep->meas_pilot->present = 1;
 411                 rep->meas_pilot->measurement_pilot = pos[0];
 412                 rep->meas_pilot->num_vendor_specific = pos[1];
 413                 os_memcpy(rep->meas_pilot->vendor_specific, pos + 2, elen - 2);
 414                 break;
 415         case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
 416                 if (elen < 4) {
 417                         wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
 418                                    "capabilities");
 419                         break;
 420                 }
 421                 os_free(rep->rrm_cap);
 422                 rep->rrm_cap =
 423                         os_zalloc(sizeof(struct rrm_enabled_capabilities));
 424                 if (rep->rrm_cap == NULL)
 425                         break;
 426                 rep->rrm_cap->present = 1;
 427                 os_memcpy(rep->rrm_cap->capabilities, pos, 4);
 428                 break;
 429         case WNM_NEIGHBOR_MULTIPLE_BSSID:
 430                 if (elen < 2) {
 431                         wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
 432                         break;
 433                 }
 434                 os_free(rep->mul_bssid);
 435                 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
 436                 if (rep->mul_bssid == NULL)
 437                         break;
 438                 rep->mul_bssid->present = 1;
 439                 rep->mul_bssid->max_bssid_indicator = pos[0];
 440                 rep->mul_bssid->num_vendor_specific = pos[1];
 441                 os_memcpy(rep->mul_bssid->vendor_specific, pos + 2, elen - 2);
 442                 break;
 443         }
 444 }
 445
 446
 447 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 448                                       const u8 *pos, u8 len,
 449                                       struct neighbor_report *rep)
 450 {
 451         u8 left = len;
 452
 453         if (left < 13) {
 454                 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
 455                 return;
 456         }
 457
 458         os_memcpy(rep->bssid, pos, ETH_ALEN);
 459         os_memcpy(rep->bssid_information, pos + ETH_ALEN, 4);
 460         rep->regulatory_class = *(pos + 10);
 461         rep->channel_number = *(pos + 11);
 462         rep->phy_type = *(pos + 12);
 463
 464         pos += 13;
 465         left -= 13;
 466
 467         while (left >= 2) {
 468                 u8 id, elen;
 469
 470                 id = *pos++;
 471                 elen = *pos++;
 472                 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
 473                 left -= 2;
 474                 if (elen > left) {
 475                         wpa_printf(MSG_DEBUG,
 476                                    "WNM: Truncated neighbor report subelement");
 477                         break;
 478                 }
 479                 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
 480                 left -= elen;
 481                 pos += elen;
 482         }
 483 }
 484
 485
 486 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
 487                                          struct wpa_scan_results *scan_res,
 488                                          struct neighbor_report *neigh_rep,
 489                                          u8 num_neigh_rep, u8 *bssid_to_connect)
 490 {
 491
 492         u8 i, j;
 493
 494         if (scan_res == NULL || num_neigh_rep == 0 || !wpa_s->current_bss)
 495                 return 0;
 496
 497         wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
 498                    MAC2STR(wpa_s->bssid), wpa_s->current_bss->level);
 499
 500         for (i = 0; i < num_neigh_rep; i++) {
 501                 for (j = 0; j < scan_res->num; j++) {
 502                         /* Check for a better RSSI AP */
 503                         if (os_memcmp(scan_res->res[j]->bssid,
 504                                       neigh_rep[i].bssid, ETH_ALEN) == 0 &&
 505                             scan_res->res[j]->level >
 506                             wpa_s->current_bss->level) {
 507                                 /* Got a BSSID with better RSSI value */
 508                                 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
 509                                           ETH_ALEN);
 510                                 wpa_printf(MSG_DEBUG, "Found a BSS " MACSTR
 511                                            " with better scan RSSI %d",
 512                                            MAC2STR(scan_res->res[j]->bssid),
 513                                            scan_res->res[j]->level);
 514                                 return 1;
 515                         }
 516                         wpa_printf(MSG_DEBUG, "scan_res[%d] " MACSTR
 517                                    " RSSI %d", j,
 518                                    MAC2STR(scan_res->res[j]->bssid),
 519                                    scan_res->res[j]->level);
 520                 }
 521         }
 522
 523         return 0;
 524 }
 525
 526
 527 static void wnm_send_bss_transition_mgmt_resp(
 528         struct wpa_supplicant *wpa_s, u8 dialog_token,
 529         enum bss_trans_mgmt_status_code status, u8 delay,
 530         const u8 *target_bssid)
 531 {
 532         u8 buf[1000], *pos;
 533         struct ieee80211_mgmt *mgmt;
 534         size_t len;
 535
 536         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
 537                    "to " MACSTR " dialog_token=%u status=%u delay=%d",
 538                    MAC2STR(wpa_s->bssid), dialog_token, status, delay);
 539
 540         mgmt = (struct ieee80211_mgmt *) buf;
 541         os_memset(&buf, 0, sizeof(buf));
 542         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 543         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 544         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 545         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 546                                            WLAN_FC_STYPE_ACTION);
 547         mgmt->u.action.category = WLAN_ACTION_WNM;
 548         mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
 549         mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
 550         mgmt->u.action.u.bss_tm_resp.status_code = status;
 551         mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
 552         pos = mgmt->u.action.u.bss_tm_resp.variable;
 553         if (target_bssid) {
 554                 os_memcpy(pos, target_bssid, ETH_ALEN);
 555                 pos += ETH_ALEN;
 556         } else if (status == WNM_BSS_TM_ACCEPT) {
 557                 /*
 558                  * P802.11-REVmc clarifies that the Target BSSID field is always
 559                  * present when status code is zero, so use a fake value here if
 560                  * no BSSID is yet known.
 561                  */
 562                 os_memset(pos, 0, ETH_ALEN);
 563                 pos += ETH_ALEN;
 564         }
 565
 566         len = pos - (u8 *) &mgmt->u.action.category;
 567
 568         wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 569                             wpa_s->own_addr, wpa_s->bssid,
 570                             &mgmt->u.action.category, len, 0);
 571 }
 572
 573
 574 void wnm_scan_response(struct wpa_supplicant *wpa_s,
 575                        struct wpa_scan_results *scan_res)
 576 {
 577         u8 bssid[ETH_ALEN];
 578
 579         if (scan_res == NULL) {
 580                 wpa_printf(MSG_ERROR, "Scan result is NULL");
 581                 goto send_bss_resp_fail;
 582         }
 583
 584         /* Compare the Neighbor Report and scan results */
 585         if (compare_scan_neighbor_results(wpa_s, scan_res,
 586                                           wpa_s->wnm_neighbor_report_elements,
 587                                           wpa_s->wnm_num_neighbor_report,
 588                                           bssid) == 1) {
 589                 /* Associate to the network */
 590                 struct wpa_bss *bss;
 591                 struct wpa_ssid *ssid = wpa_s->current_ssid;
 592
 593                 bss = wpa_bss_get_bssid(wpa_s, bssid);
 594                 if (!bss) {
 595                         wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
 596                                    "BSS table");
 597                         goto send_bss_resp_fail;
 598                 }
 599
 600                 /* Send the BSS Management Response - Accept */
 601                 if (wpa_s->wnm_reply) {
 602                         wnm_send_bss_transition_mgmt_resp(wpa_s,
 603                                                   wpa_s->wnm_dialog_token,
 604                                                   WNM_BSS_TM_ACCEPT,
 605                                                   0, bssid);
 606                 }
 607
 608                 wpa_s->reassociate = 1;
 609                 wpa_supplicant_connect(wpa_s, bss, ssid);
 610                 wnm_deallocate_memory(wpa_s);
 611                 return;
 612         }
 613
 614         /* Send reject response for all the failures */
 615 send_bss_resp_fail:
 616         wnm_deallocate_memory(wpa_s);
 617         if (wpa_s->wnm_reply) {
 618                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 619                                                   wpa_s->wnm_dialog_token,
 620                                                   WNM_BSS_TM_REJECT_UNSPECIFIED,
 621                                                   0, NULL);
 622         }
 623         return;
 624 }
 625
 626
 627 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 628                                              const u8 *pos, const u8 *end,
 629                                              int reply)
 630 {
 631         if (pos + 5 > end)
 632                 return;
 633
 634         wpa_s->wnm_dialog_token = pos[0];
 635         wpa_s->wnm_mode = pos[1];
 636         wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
 637         wpa_s->wnm_validity_interval = pos[4];
 638         wpa_s->wnm_reply = reply;
 639
 640         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
 641                    "dialog_token=%u request_mode=0x%x "
 642                    "disassoc_timer=%u validity_interval=%u",
 643                    wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
 644                    wpa_s->wnm_dissoc_timer, wpa_s->wnm_validity_interval);
 645
 646         pos += 5;
 647
 648         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 649                 if (pos + 12 > end) {
 650                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
 651                         return;
 652                 }
 653                 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
 654                 pos += 12; /* BSS Termination Duration */
 655         }
 656
 657         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
 658                 char url[256];
 659                 unsigned int beacon_int;
 660
 661                 if (pos + 1 > end || pos + 1 + pos[0] > end) {
 662                         wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
 663                                    "Management Request (URL)");
 664                         return;
 665                 }
 666                 os_memcpy(url, pos + 1, pos[0]);
 667                 url[pos[0]] = '\0';
 668                 pos += 1 + pos[0];
 669
 670                 if (wpa_s->current_bss)
 671                         beacon_int = wpa_s->current_bss->beacon_int;
 672                 else
 673                         beacon_int = 100; /* best guess */
 674
 675                 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
 676                         wpa_sm_pmf_enabled(wpa_s->wpa),
 677                         wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
 678         }
 679
 680         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 681                 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
 682                         "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
 683                 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
 684                         /* TODO: mark current BSS less preferred for
 685                          * selection */
 686                         wpa_printf(MSG_DEBUG, "Trying to find another BSS");
 687                         wpa_supplicant_req_scan(wpa_s, 0, 0);
 688                 }
 689         }
 690
 691         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 692                 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
 693                 wpa_s->wnm_num_neighbor_report = 0;
 694                 os_free(wpa_s->wnm_neighbor_report_elements);
 695                 wpa_s->wnm_neighbor_report_elements = os_zalloc(
 696                         WNM_MAX_NEIGHBOR_REPORT *
 697                         sizeof(struct neighbor_report));
 698                 if (wpa_s->wnm_neighbor_report_elements == NULL)
 699                         return;
 700
 701                 while (pos + 2 <= end &&
 702                        wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
 703                 {
 704                         u8 tag = *pos++;
 705                         u8 len = *pos++;
 706
 707                         wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
 708                                    tag);
 709                         if (pos + len > end) {
 710                                 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
 711                                 return;
 712                         }
 713                         if (tag == WLAN_EID_NEIGHBOR_REPORT) {
 714                                 struct neighbor_report *rep;
 715                                 rep = &wpa_s->wnm_neighbor_report_elements[
 716                                         wpa_s->wnm_num_neighbor_report];
 717                                 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
 718                         }
 719
 720                         pos += len;
 721                         wpa_s->wnm_num_neighbor_report++;
 722                 }
 723
 724                 wpa_s->scan_res_handler = wnm_scan_response;
 725                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 726         } else if (reply) {
 727                 enum bss_trans_mgmt_status_code status;
 728                 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
 729                         status = WNM_BSS_TM_ACCEPT;
 730                 else {
 731                         wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
 732                         status = WNM_BSS_TM_REJECT_UNSPECIFIED;
 733                 }
 734                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 735                                                   wpa_s->wnm_dialog_token,
 736                                                   status, 0, NULL);
 737         }
 738 }
 739
 740
 741 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 742                                        u8 query_reason)
 743 {
 744         u8 buf[1000], *pos;
 745         struct ieee80211_mgmt *mgmt;
 746         size_t len;
 747         int ret;
 748
 749         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
 750                    MACSTR " query_reason=%u",
 751                    MAC2STR(wpa_s->bssid), query_reason);
 752
 753         mgmt = (struct ieee80211_mgmt *) buf;
 754         os_memset(&buf, 0, sizeof(buf));
 755         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 756         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 757         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 758         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 759                                            WLAN_FC_STYPE_ACTION);
 760         mgmt->u.action.category = WLAN_ACTION_WNM;
 761         mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
 762         mgmt->u.action.u.bss_tm_query.dialog_token = 1;
 763         mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 764         pos = mgmt->u.action.u.bss_tm_query.variable;
 765
 766         len = pos - (u8 *) &mgmt->u.action.category;
 767
 768         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 769                                   wpa_s->own_addr, wpa_s->bssid,
 770                                   &mgmt->u.action.category, len, 0);
 771
 772         return ret;
 773 }
 774
 775
 776 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
 777                                             const u8 *sa, const u8 *data,
 778                                             int len)
 779 {
 780         const u8 *pos, *end, *next;
 781         u8 ie, ie_len;
 782
 783         pos = data;
 784         end = data + len;
 785
 786         while (pos + 1 < end) {
 787                 ie = *pos++;
 788                 ie_len = *pos++;
 789                 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
 790                            ie, ie_len);
 791                 if (ie_len > end - pos) {
 792                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
 793                                    "subelement");
 794                         break;
 795                 }
 796                 next = pos + ie_len;
 797                 if (ie_len < 4) {
 798                         pos = next;
 799                         continue;
 800                 }
 801                 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
 802                            WPA_GET_BE24(pos), pos[3]);
 803
 804 #ifdef CONFIG_HS20
 805                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
 806                     WPA_GET_BE24(pos) == OUI_WFA &&
 807                     pos[3] == HS20_WNM_SUB_REM_NEEDED) {
 808                         /* Subscription Remediation subelement */
 809                         const u8 *ie_end;
 810                         u8 url_len;
 811                         char *url;
 812                         u8 osu_method;
 813
 814                         wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
 815                                    "subelement");
 816                         ie_end = pos + ie_len;
 817                         pos += 4;
 818                         url_len = *pos++;
 819                         if (url_len == 0) {
 820                                 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
 821                                 url = NULL;
 822                                 osu_method = 1;
 823                         } else {
 824                                 if (pos + url_len + 1 > ie_end) {
 825                                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
 826                                                    url_len,
 827                                                    (int) (ie_end - pos));
 828                                         break;
 829                                 }
 830                                 url = os_malloc(url_len + 1);
 831                                 if (url == NULL)
 832                                         break;
 833                                 os_memcpy(url, pos, url_len);
 834                                 url[url_len] = '\0';
 835                                 osu_method = pos[url_len];
 836                         }
 837                         hs20_rx_subscription_remediation(wpa_s, url,
 838                                                          osu_method);
 839                         os_free(url);
 840                         pos = next;
 841                         continue;
 842                 }
 843
 844                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
 845                     WPA_GET_BE24(pos) == OUI_WFA &&
 846                     pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
 847                         const u8 *ie_end;
 848                         u8 url_len;
 849                         char *url;
 850                         u8 code;
 851                         u16 reauth_delay;
 852
 853                         ie_end = pos + ie_len;
 854                         pos += 4;
 855                         code = *pos++;
 856                         reauth_delay = WPA_GET_LE16(pos);
 857                         pos += 2;
 858                         url_len = *pos++;
 859                         wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
 860                                    "Imminent - Reason Code %u   "
 861                                    "Re-Auth Delay %u  URL Length %u",
 862                                    code, reauth_delay, url_len);
 863                         if (pos + url_len > ie_end)
 864                                 break;
 865                         url = os_malloc(url_len + 1);
 866                         if (url == NULL)
 867                                 break;
 868                         os_memcpy(url, pos, url_len);
 869                         url[url_len] = '\0';
 870                         hs20_rx_deauth_imminent_notice(wpa_s, code,
 871                                                        reauth_delay, url);
 872                         os_free(url);
 873                         pos = next;
 874                         continue;
 875                 }
 876 #endif /* CONFIG_HS20 */
 877
 878                 pos = next;
 879         }
 880 }
 881
 882
 883 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
 884                                         const u8 *sa, const u8 *frm, int len)
 885 {
 886         const u8 *pos, *end;
 887         u8 dialog_token, type;
 888
 889         /* Dialog Token [1] | Type [1] | Subelements */
 890
 891         if (len < 2 || sa == NULL)
 892                 return;
 893         end = frm + len;
 894         pos = frm;
 895         dialog_token = *pos++;
 896         type = *pos++;
 897
 898         wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
 899                 "(dialog_token %u type %u sa " MACSTR ")",
 900                 dialog_token, type, MAC2STR(sa));
 901         wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
 902                     pos, end - pos);
 903
 904         if (wpa_s->wpa_state != WPA_COMPLETED ||
 905             os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
 906                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
 907                         "from our AP - ignore it");
 908                 return;
 909         }
 910
 911         switch (type) {
 912         case 1:
 913                 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
 914                 break;
 915         default:
 916                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
 917                         "WNM-Notification type %u", type);
 918                 break;
 919         }
 920 }
 921
 922
 923 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 924                               const struct ieee80211_mgmt *mgmt, size_t len)
 925 {
 926         const u8 *pos, *end;
 927         u8 act;
 928
 929         if (len < IEEE80211_HDRLEN + 2)
 930                 return;
 931
 932         pos = &mgmt->u.action.category;
 933         pos++;
 934         act = *pos++;
 935         end = ((const u8 *) mgmt) + len;
 936
 937         wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
 938                    act, MAC2STR(mgmt->sa));
 939         if (wpa_s->wpa_state < WPA_ASSOCIATED ||
 940             os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
 941                 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
 942                            "frame");
 943                 return;
 944         }
 945
 946         switch (act) {
 947         case WNM_BSS_TRANS_MGMT_REQ:
 948                 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
 949                                                  !(mgmt->da[0] & 0x01));
 950                 break;
 951         case WNM_SLEEP_MODE_RESP:
 952                 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
 953                 break;
 954         case WNM_NOTIFICATION_REQ:
 955                 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
 956                 break;
 957         default:
 958                 wpa_printf(MSG_ERROR, "WNM: Unknown request");
 959                 break;
 960         }
 961 }