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].meas_pilot);
 313                 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
 314         }
 315
 316         wpa_s->wnm_num_neighbor_report = 0;
 317         os_free(wpa_s->wnm_neighbor_report_elements);
 318         wpa_s->wnm_neighbor_report_elements = NULL;
 319 }
 320
 321
 322 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
 323                                            u8 id, u8 elen, const u8 *pos)
 324 {
 325         switch (id) {
 326         case WNM_NEIGHBOR_TSF:
 327                 if (elen < 2 + 2) {
 328                         wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
 329                         break;
 330                 }
 331                 rep->tsf_offset = WPA_GET_LE16(pos);
 332                 rep->beacon_int = WPA_GET_LE16(pos + 2);
 333                 rep->tsf_present = 1;
 334                 break;
 335         case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
 336                 if (elen < 2) {
 337                         wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
 338                                    "country string");
 339                         break;
 340                 }
 341                 os_memcpy(rep->country, pos, 2);
 342                 rep->country_present = 1;
 343                 break;
 344         case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
 345                 if (elen < 1) {
 346                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
 347                                    "candidate");
 348                         break;
 349                 }
 350                 rep->preference = pos[0];
 351                 rep->preference_present = 1;
 352                 break;
 353         case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
 354                 rep->bss_term_tsf = WPA_GET_LE64(pos);
 355                 rep->bss_term_dur = WPA_GET_LE16(pos + 8);
 356                 rep->bss_term_present = 1;
 357                 break;
 358         case WNM_NEIGHBOR_BEARING:
 359                 if (elen < 8) {
 360                         wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
 361                                    "bearing");
 362                         break;
 363                 }
 364                 rep->bearing = WPA_GET_LE16(pos);
 365                 rep->distance = WPA_GET_LE32(pos + 2);
 366                 rep->rel_height = WPA_GET_LE16(pos + 2 + 4);
 367                 rep->bearing_present = 1;
 368                 break;
 369         case WNM_NEIGHBOR_MEASUREMENT_PILOT:
 370                 if (elen < 1) {
 371                         wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
 372                                    "pilot");
 373                         break;
 374                 }
 375                 os_free(rep->meas_pilot);
 376                 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
 377                 if (rep->meas_pilot == NULL)
 378                         break;
 379                 rep->meas_pilot->measurement_pilot = pos[0];
 380                 rep->meas_pilot->subelem_len = elen - 1;
 381                 os_memcpy(rep->meas_pilot->subelems, pos + 1, elen - 1);
 382                 break;
 383         case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
 384                 if (elen < 5) {
 385                         wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
 386                                    "capabilities");
 387                         break;
 388                 }
 389                 os_memcpy(rep->rm_capab, pos, 5);
 390                 rep->rm_capab_present = 1;
 391                 break;
 392         case WNM_NEIGHBOR_MULTIPLE_BSSID:
 393                 if (elen < 1) {
 394                         wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
 395                         break;
 396                 }
 397                 os_free(rep->mul_bssid);
 398                 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
 399                 if (rep->mul_bssid == NULL)
 400                         break;
 401                 rep->mul_bssid->max_bssid_indicator = pos[0];
 402                 rep->mul_bssid->subelem_len = elen - 1;
 403                 os_memcpy(rep->mul_bssid->subelems, pos + 1, elen - 1);
 404                 break;
 405         }
 406 }
 407
 408
 409 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 410                                       const u8 *pos, u8 len,
 411                                       struct neighbor_report *rep)
 412 {
 413         u8 left = len;
 414
 415         if (left < 13) {
 416                 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
 417                 return;
 418         }
 419
 420         os_memcpy(rep->bssid, pos, ETH_ALEN);
 421         rep->bssid_info = WPA_GET_LE32(pos + ETH_ALEN);
 422         rep->regulatory_class = *(pos + 10);
 423         rep->channel_number = *(pos + 11);
 424         rep->phy_type = *(pos + 12);
 425
 426         pos += 13;
 427         left -= 13;
 428
 429         while (left >= 2) {
 430                 u8 id, elen;
 431
 432                 id = *pos++;
 433                 elen = *pos++;
 434                 wpa_printf(MSG_DEBUG, "WNM: Subelement id=%u len=%u", id, elen);
 435                 left -= 2;
 436                 if (elen > left) {
 437                         wpa_printf(MSG_DEBUG,
 438                                    "WNM: Truncated neighbor report subelement");
 439                         break;
 440                 }
 441                 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
 442                 left -= elen;
 443                 pos += elen;
 444         }
 445 }
 446
 447
 448 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
 449                                          struct wpa_scan_results *scan_res,
 450                                          struct neighbor_report *neigh_rep,
 451                                          u8 num_neigh_rep, u8 *bssid_to_connect)
 452 {
 453
 454         u8 i, j;
 455
 456         if (scan_res == NULL || num_neigh_rep == 0 || !wpa_s->current_bss)
 457                 return 0;
 458
 459         wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
 460                    MAC2STR(wpa_s->bssid), wpa_s->current_bss->level);
 461
 462         for (i = 0; i < num_neigh_rep; i++) {
 463                 for (j = 0; j < scan_res->num; j++) {
 464                         /* Check for a better RSSI AP */
 465                         if (os_memcmp(scan_res->res[j]->bssid,
 466                                       neigh_rep[i].bssid, ETH_ALEN) == 0 &&
 467                             scan_res->res[j]->level >
 468                             wpa_s->current_bss->level) {
 469                                 /* Got a BSSID with better RSSI value */
 470                                 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
 471                                           ETH_ALEN);
 472                                 wpa_printf(MSG_DEBUG, "Found a BSS " MACSTR
 473                                            " with better scan RSSI %d",
 474                                            MAC2STR(scan_res->res[j]->bssid),
 475                                            scan_res->res[j]->level);
 476                                 return 1;
 477                         }
 478                         wpa_printf(MSG_DEBUG, "scan_res[%d] " MACSTR
 479                                    " RSSI %d", j,
 480                                    MAC2STR(scan_res->res[j]->bssid),
 481                                    scan_res->res[j]->level);
 482                 }
 483         }
 484
 485         return 0;
 486 }
 487
 488
 489 static void wnm_send_bss_transition_mgmt_resp(
 490         struct wpa_supplicant *wpa_s, u8 dialog_token,
 491         enum bss_trans_mgmt_status_code status, u8 delay,
 492         const u8 *target_bssid)
 493 {
 494         u8 buf[1000], *pos;
 495         struct ieee80211_mgmt *mgmt;
 496         size_t len;
 497
 498         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
 499                    "to " MACSTR " dialog_token=%u status=%u delay=%d",
 500                    MAC2STR(wpa_s->bssid), dialog_token, status, delay);
 501
 502         mgmt = (struct ieee80211_mgmt *) buf;
 503         os_memset(&buf, 0, sizeof(buf));
 504         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 505         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 506         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 507         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 508                                            WLAN_FC_STYPE_ACTION);
 509         mgmt->u.action.category = WLAN_ACTION_WNM;
 510         mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
 511         mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
 512         mgmt->u.action.u.bss_tm_resp.status_code = status;
 513         mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
 514         pos = mgmt->u.action.u.bss_tm_resp.variable;
 515         if (target_bssid) {
 516                 os_memcpy(pos, target_bssid, ETH_ALEN);
 517                 pos += ETH_ALEN;
 518         } else if (status == WNM_BSS_TM_ACCEPT) {
 519                 /*
 520                  * P802.11-REVmc clarifies that the Target BSSID field is always
 521                  * present when status code is zero, so use a fake value here if
 522                  * no BSSID is yet known.
 523                  */
 524                 os_memset(pos, 0, ETH_ALEN);
 525                 pos += ETH_ALEN;
 526         }
 527
 528         len = pos - (u8 *) &mgmt->u.action.category;
 529
 530         wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 531                             wpa_s->own_addr, wpa_s->bssid,
 532                             &mgmt->u.action.category, len, 0);
 533 }
 534
 535
 536 void wnm_scan_response(struct wpa_supplicant *wpa_s,
 537                        struct wpa_scan_results *scan_res)
 538 {
 539         u8 bssid[ETH_ALEN];
 540
 541         if (scan_res == NULL) {
 542                 wpa_printf(MSG_ERROR, "Scan result is NULL");
 543                 goto send_bss_resp_fail;
 544         }
 545
 546         /* Compare the Neighbor Report and scan results */
 547         if (compare_scan_neighbor_results(wpa_s, scan_res,
 548                                           wpa_s->wnm_neighbor_report_elements,
 549                                           wpa_s->wnm_num_neighbor_report,
 550                                           bssid) == 1) {
 551                 /* Associate to the network */
 552                 struct wpa_bss *bss;
 553                 struct wpa_ssid *ssid = wpa_s->current_ssid;
 554
 555                 bss = wpa_bss_get_bssid(wpa_s, bssid);
 556                 if (!bss) {
 557                         wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
 558                                    "BSS table");
 559                         goto send_bss_resp_fail;
 560                 }
 561
 562                 /* Send the BSS Management Response - Accept */
 563                 if (wpa_s->wnm_reply) {
 564                         wnm_send_bss_transition_mgmt_resp(wpa_s,
 565                                                   wpa_s->wnm_dialog_token,
 566                                                   WNM_BSS_TM_ACCEPT,
 567                                                   0, bssid);
 568                 }
 569
 570                 wpa_s->reassociate = 1;
 571                 wpa_supplicant_connect(wpa_s, bss, ssid);
 572                 wnm_deallocate_memory(wpa_s);
 573                 return;
 574         }
 575
 576         /* Send reject response for all the failures */
 577 send_bss_resp_fail:
 578         wnm_deallocate_memory(wpa_s);
 579         if (wpa_s->wnm_reply) {
 580                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 581                                                   wpa_s->wnm_dialog_token,
 582                                                   WNM_BSS_TM_REJECT_UNSPECIFIED,
 583                                                   0, NULL);
 584         }
 585         return;
 586 }
 587
 588
 589 static void wnm_dump_cand_list(struct wpa_supplicant *wpa_s)
 590 {
 591         unsigned int i;
 592
 593         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Candidate List");
 594         if (!wpa_s->wnm_neighbor_report_elements)
 595                 return;
 596         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 597                 struct neighbor_report *nei;
 598
 599                 nei = &wpa_s->wnm_neighbor_report_elements[i];
 600                 wpa_printf(MSG_DEBUG, "%u: " MACSTR
 601                            " info=0x%x op_class=%u chan=%u phy=%u pref=%d",
 602                            i, MAC2STR(nei->bssid), nei->bssid_info,
 603                            nei->regulatory_class,
 604                            nei->channel_number, nei->phy_type,
 605                            nei->preference_present ? nei->preference : -1);
 606         }
 607 }
 608
 609
 610 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 611                                              const u8 *pos, const u8 *end,
 612                                              int reply)
 613 {
 614         unsigned int beacon_int;
 615         u8 valid_int;
 616
 617         if (pos + 5 > end)
 618                 return;
 619
 620         if (wpa_s->current_bss)
 621                 beacon_int = wpa_s->current_bss->beacon_int;
 622         else
 623                 beacon_int = 100; /* best guess */
 624
 625         wpa_s->wnm_dialog_token = pos[0];
 626         wpa_s->wnm_mode = pos[1];
 627         wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
 628         valid_int = pos[4];
 629         wpa_s->wnm_reply = reply;
 630
 631         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
 632                    "dialog_token=%u request_mode=0x%x "
 633                    "disassoc_timer=%u validity_interval=%u",
 634                    wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
 635                    wpa_s->wnm_dissoc_timer, valid_int);
 636
 637         pos += 5;
 638
 639         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 640                 if (pos + 12 > end) {
 641                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
 642                         return;
 643                 }
 644                 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
 645                 pos += 12; /* BSS Termination Duration */
 646         }
 647
 648         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
 649                 char url[256];
 650
 651                 if (pos + 1 > end || pos + 1 + pos[0] > end) {
 652                         wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
 653                                    "Management Request (URL)");
 654                         return;
 655                 }
 656                 os_memcpy(url, pos + 1, pos[0]);
 657                 url[pos[0]] = '\0';
 658                 pos += 1 + pos[0];
 659
 660                 wpa_msg(wpa_s, MSG_INFO, ESS_DISASSOC_IMMINENT "%d %u %s",
 661                         wpa_sm_pmf_enabled(wpa_s->wpa),
 662                         wpa_s->wnm_dissoc_timer * beacon_int * 128 / 125, url);
 663         }
 664
 665         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 666                 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
 667                         "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
 668                 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
 669                         /* TODO: mark current BSS less preferred for
 670                          * selection */
 671                         wpa_printf(MSG_DEBUG, "Trying to find another BSS");
 672                         wpa_supplicant_req_scan(wpa_s, 0, 0);
 673                 }
 674         }
 675
 676         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 677                 unsigned int valid_ms;
 678
 679                 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
 680                 wpa_s->wnm_num_neighbor_report = 0;
 681                 os_free(wpa_s->wnm_neighbor_report_elements);
 682                 wpa_s->wnm_neighbor_report_elements = os_zalloc(
 683                         WNM_MAX_NEIGHBOR_REPORT *
 684                         sizeof(struct neighbor_report));
 685                 if (wpa_s->wnm_neighbor_report_elements == NULL)
 686                         return;
 687
 688                 while (pos + 2 <= end &&
 689                        wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
 690                 {
 691                         u8 tag = *pos++;
 692                         u8 len = *pos++;
 693
 694                         wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
 695                                    tag);
 696                         if (pos + len > end) {
 697                                 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
 698                                 return;
 699                         }
 700                         if (tag == WLAN_EID_NEIGHBOR_REPORT) {
 701                                 struct neighbor_report *rep;
 702                                 rep = &wpa_s->wnm_neighbor_report_elements[
 703                                         wpa_s->wnm_num_neighbor_report];
 704                                 wnm_parse_neighbor_report(wpa_s, pos, len, rep);
 705                         }
 706
 707                         pos += len;
 708                         wpa_s->wnm_num_neighbor_report++;
 709                 }
 710                 wnm_dump_cand_list(wpa_s);
 711                 valid_ms = valid_int * beacon_int * 128 / 125;
 712                 wpa_printf(MSG_DEBUG, "WNM: Candidate list valid for %u ms",
 713                            valid_ms);
 714                 os_get_reltime(&wpa_s->wnm_cand_valid_until);
 715                 wpa_s->wnm_cand_valid_until.sec += valid_ms / 1000;
 716                 wpa_s->wnm_cand_valid_until.usec += (valid_ms % 1000) * 1000;
 717                 wpa_s->wnm_cand_valid_until.sec +=
 718                         wpa_s->wnm_cand_valid_until.usec / 1000000;
 719                 wpa_s->wnm_cand_valid_until.usec %= 1000000;
 720
 721                 wpa_s->scan_res_handler = wnm_scan_response;
 722                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 723         } else if (reply) {
 724                 enum bss_trans_mgmt_status_code status;
 725                 if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT)
 726                         status = WNM_BSS_TM_ACCEPT;
 727                 else {
 728                         wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management Request did not include candidates");
 729                         status = WNM_BSS_TM_REJECT_UNSPECIFIED;
 730                 }
 731                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 732                                                   wpa_s->wnm_dialog_token,
 733                                                   status, 0, NULL);
 734         }
 735 }
 736
 737
 738 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 739                                        u8 query_reason)
 740 {
 741         u8 buf[1000], *pos;
 742         struct ieee80211_mgmt *mgmt;
 743         size_t len;
 744         int ret;
 745
 746         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
 747                    MACSTR " query_reason=%u",
 748                    MAC2STR(wpa_s->bssid), query_reason);
 749
 750         mgmt = (struct ieee80211_mgmt *) buf;
 751         os_memset(&buf, 0, sizeof(buf));
 752         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 753         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 754         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 755         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 756                                            WLAN_FC_STYPE_ACTION);
 757         mgmt->u.action.category = WLAN_ACTION_WNM;
 758         mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
 759         mgmt->u.action.u.bss_tm_query.dialog_token = 1;
 760         mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 761         pos = mgmt->u.action.u.bss_tm_query.variable;
 762
 763         len = pos - (u8 *) &mgmt->u.action.category;
 764
 765         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 766                                   wpa_s->own_addr, wpa_s->bssid,
 767                                   &mgmt->u.action.category, len, 0);
 768
 769         return ret;
 770 }
 771
 772
 773 static void ieee802_11_rx_wnm_notif_req_wfa(struct wpa_supplicant *wpa_s,
 774                                             const u8 *sa, const u8 *data,
 775                                             int len)
 776 {
 777         const u8 *pos, *end, *next;
 778         u8 ie, ie_len;
 779
 780         pos = data;
 781         end = data + len;
 782
 783         while (pos + 1 < end) {
 784                 ie = *pos++;
 785                 ie_len = *pos++;
 786                 wpa_printf(MSG_DEBUG, "WNM: WFA subelement %u len %u",
 787                            ie, ie_len);
 788                 if (ie_len > end - pos) {
 789                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for "
 790                                    "subelement");
 791                         break;
 792                 }
 793                 next = pos + ie_len;
 794                 if (ie_len < 4) {
 795                         pos = next;
 796                         continue;
 797                 }
 798                 wpa_printf(MSG_DEBUG, "WNM: Subelement OUI %06x type %u",
 799                            WPA_GET_BE24(pos), pos[3]);
 800
 801 #ifdef CONFIG_HS20
 802                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 5 &&
 803                     WPA_GET_BE24(pos) == OUI_WFA &&
 804                     pos[3] == HS20_WNM_SUB_REM_NEEDED) {
 805                         /* Subscription Remediation subelement */
 806                         const u8 *ie_end;
 807                         u8 url_len;
 808                         char *url;
 809                         u8 osu_method;
 810
 811                         wpa_printf(MSG_DEBUG, "WNM: Subscription Remediation "
 812                                    "subelement");
 813                         ie_end = pos + ie_len;
 814                         pos += 4;
 815                         url_len = *pos++;
 816                         if (url_len == 0) {
 817                                 wpa_printf(MSG_DEBUG, "WNM: No Server URL included");
 818                                 url = NULL;
 819                                 osu_method = 1;
 820                         } else {
 821                                 if (pos + url_len + 1 > ie_end) {
 822                                         wpa_printf(MSG_DEBUG, "WNM: Not enough room for Server URL (len=%u) and Server Method (left %d)",
 823                                                    url_len,
 824                                                    (int) (ie_end - pos));
 825                                         break;
 826                                 }
 827                                 url = os_malloc(url_len + 1);
 828                                 if (url == NULL)
 829                                         break;
 830                                 os_memcpy(url, pos, url_len);
 831                                 url[url_len] = '\0';
 832                                 osu_method = pos[url_len];
 833                         }
 834                         hs20_rx_subscription_remediation(wpa_s, url,
 835                                                          osu_method);
 836                         os_free(url);
 837                         pos = next;
 838                         continue;
 839                 }
 840
 841                 if (ie == WLAN_EID_VENDOR_SPECIFIC && ie_len >= 8 &&
 842                     WPA_GET_BE24(pos) == OUI_WFA &&
 843                     pos[3] == HS20_WNM_DEAUTH_IMMINENT_NOTICE) {
 844                         const u8 *ie_end;
 845                         u8 url_len;
 846                         char *url;
 847                         u8 code;
 848                         u16 reauth_delay;
 849
 850                         ie_end = pos + ie_len;
 851                         pos += 4;
 852                         code = *pos++;
 853                         reauth_delay = WPA_GET_LE16(pos);
 854                         pos += 2;
 855                         url_len = *pos++;
 856                         wpa_printf(MSG_DEBUG, "WNM: HS 2.0 Deauthentication "
 857                                    "Imminent - Reason Code %u   "
 858                                    "Re-Auth Delay %u  URL Length %u",
 859                                    code, reauth_delay, url_len);
 860                         if (pos + url_len > ie_end)
 861                                 break;
 862                         url = os_malloc(url_len + 1);
 863                         if (url == NULL)
 864                                 break;
 865                         os_memcpy(url, pos, url_len);
 866                         url[url_len] = '\0';
 867                         hs20_rx_deauth_imminent_notice(wpa_s, code,
 868                                                        reauth_delay, url);
 869                         os_free(url);
 870                         pos = next;
 871                         continue;
 872                 }
 873 #endif /* CONFIG_HS20 */
 874
 875                 pos = next;
 876         }
 877 }
 878
 879
 880 static void ieee802_11_rx_wnm_notif_req(struct wpa_supplicant *wpa_s,
 881                                         const u8 *sa, const u8 *frm, int len)
 882 {
 883         const u8 *pos, *end;
 884         u8 dialog_token, type;
 885
 886         /* Dialog Token [1] | Type [1] | Subelements */
 887
 888         if (len < 2 || sa == NULL)
 889                 return;
 890         end = frm + len;
 891         pos = frm;
 892         dialog_token = *pos++;
 893         type = *pos++;
 894
 895         wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Received WNM-Notification Request "
 896                 "(dialog_token %u type %u sa " MACSTR ")",
 897                 dialog_token, type, MAC2STR(sa));
 898         wpa_hexdump(MSG_DEBUG, "WNM-Notification Request subelements",
 899                     pos, end - pos);
 900
 901         if (wpa_s->wpa_state != WPA_COMPLETED ||
 902             os_memcmp(sa, wpa_s->bssid, ETH_ALEN) != 0) {
 903                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: WNM-Notification frame not "
 904                         "from our AP - ignore it");
 905                 return;
 906         }
 907
 908         switch (type) {
 909         case 1:
 910                 ieee802_11_rx_wnm_notif_req_wfa(wpa_s, sa, pos, end - pos);
 911                 break;
 912         default:
 913                 wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Ignore unknown "
 914                         "WNM-Notification type %u", type);
 915                 break;
 916         }
 917 }
 918
 919
 920 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 921                               const struct ieee80211_mgmt *mgmt, size_t len)
 922 {
 923         const u8 *pos, *end;
 924         u8 act;
 925
 926         if (len < IEEE80211_HDRLEN + 2)
 927                 return;
 928
 929         pos = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
 930         act = *pos++;
 931         end = ((const u8 *) mgmt) + len;
 932
 933         wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
 934                    act, MAC2STR(mgmt->sa));
 935         if (wpa_s->wpa_state < WPA_ASSOCIATED ||
 936             os_memcmp(mgmt->sa, wpa_s->bssid, ETH_ALEN) != 0) {
 937                 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
 938                            "frame");
 939                 return;
 940         }
 941
 942         switch (act) {
 943         case WNM_BSS_TRANS_MGMT_REQ:
 944                 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
 945                                                  !(mgmt->da[0] & 0x01));
 946                 break;
 947         case WNM_SLEEP_MODE_RESP:
 948                 ieee802_11_rx_wnmsleep_resp(wpa_s, pos, end - pos);
 949                 break;
 950         case WNM_NOTIFICATION_REQ:
 951                 ieee802_11_rx_wnm_notif_req(wpa_s, mgmt->sa, pos, end - pos);
 952                 break;
 953         default:
 954                 wpa_printf(MSG_ERROR, "WNM: Unknown request");
 955                 break;
 956         }
 957 }