libeap/src/ap/wnm_ap.c

   1 /*
   2  * hostapd - WNM
   3  * Copyright (c) 2011-2014, 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 "utils/eloop.h"
  13 #include "common/ieee802_11_defs.h"
  14 #include "common/wpa_ctrl.h"
  15 #include "ap/hostapd.h"
  16 #include "ap/sta_info.h"
  17 #include "ap/ap_config.h"
  18 #include "ap/ap_drv_ops.h"
  19 #include "ap/wpa_auth.h"
  20 #include "wnm_ap.h"
  21
  22 #define MAX_TFS_IE_LEN  1024
  23
  24
  25 /* get the TFS IE from driver */
  26 static int ieee80211_11_get_tfs_ie(struct hostapd_data *hapd, const u8 *addr,
  27                                    u8 *buf, u16 *buf_len, enum wnm_oper oper)
  28 {
  29         wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
  30
  31         return hostapd_drv_wnm_oper(hapd, oper, addr, buf, buf_len);
  32 }
  33
  34
  35 /* set the TFS IE to driver */
  36 static int ieee80211_11_set_tfs_ie(struct hostapd_data *hapd, const u8 *addr,
  37                                    u8 *buf, u16 *buf_len, enum wnm_oper oper)
  38 {
  39         wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
  40
  41         return hostapd_drv_wnm_oper(hapd, oper, addr, buf, buf_len);
  42 }
  43
  44
  45 /* MLME-SLEEPMODE.response */
  46 static int ieee802_11_send_wnmsleep_resp(struct hostapd_data *hapd,
  47                                          const u8 *addr, u8 dialog_token,
  48                                          u8 action_type, u16 intval)
  49 {
  50         struct ieee80211_mgmt *mgmt;
  51         int res;
  52         size_t len;
  53         size_t gtk_elem_len = 0;
  54         size_t igtk_elem_len = 0;
  55         struct wnm_sleep_element wnmsleep_ie;
  56         u8 *wnmtfs_ie;
  57         u8 wnmsleep_ie_len;
  58         u16 wnmtfs_ie_len;
  59         u8 *pos;
  60         struct sta_info *sta;
  61         enum wnm_oper tfs_oper = action_type == WNM_SLEEP_MODE_ENTER ?
  62                 WNM_SLEEP_TFS_RESP_IE_ADD : WNM_SLEEP_TFS_RESP_IE_NONE;
  63
  64         sta = ap_get_sta(hapd, addr);
  65         if (sta == NULL) {
  66                 wpa_printf(MSG_DEBUG, "%s: station not found", __func__);
  67                 return -EINVAL;
  68         }
  69
  70         /* WNM-Sleep Mode IE */
  71         os_memset(&wnmsleep_ie, 0, sizeof(struct wnm_sleep_element));
  72         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  73         wnmsleep_ie.eid = WLAN_EID_WNMSLEEP;
  74         wnmsleep_ie.len = wnmsleep_ie_len - 2;
  75         wnmsleep_ie.action_type = action_type;
  76         wnmsleep_ie.status = WNM_STATUS_SLEEP_ACCEPT;
  77         wnmsleep_ie.intval = host_to_le16(intval);
  78
  79         /* TFS IE(s) */
  80         wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  81         if (wnmtfs_ie == NULL)
  82                 return -1;
  83         if (ieee80211_11_get_tfs_ie(hapd, addr, wnmtfs_ie, &wnmtfs_ie_len,
  84                                     tfs_oper)) {
  85                 wnmtfs_ie_len = 0;
  86                 os_free(wnmtfs_ie);
  87                 wnmtfs_ie = NULL;
  88         }
  89
  90 #define MAX_GTK_SUBELEM_LEN 45
  91 #define MAX_IGTK_SUBELEM_LEN 26
  92         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len +
  93                          MAX_GTK_SUBELEM_LEN + MAX_IGTK_SUBELEM_LEN);
  94         if (mgmt == NULL) {
  95                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
  96                            "WNM-Sleep Response action frame");
  97                 return -1;
  98         }
  99         os_memcpy(mgmt->da, addr, ETH_ALEN);
 100         os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
 101         os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN);
 102         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 103                                            WLAN_FC_STYPE_ACTION);
 104         mgmt->u.action.category = WLAN_ACTION_WNM;
 105         mgmt->u.action.u.wnm_sleep_resp.action = WNM_SLEEP_MODE_RESP;
 106         mgmt->u.action.u.wnm_sleep_resp.dialogtoken = dialog_token;
 107         pos = (u8 *)mgmt->u.action.u.wnm_sleep_resp.variable;
 108         /* add key data if MFP is enabled */
 109         if (!wpa_auth_uses_mfp(sta->wpa_sm) ||
 110             action_type != WNM_SLEEP_MODE_EXIT) {
 111                 mgmt->u.action.u.wnm_sleep_resp.keydata_len = 0;
 112         } else {
 113                 gtk_elem_len = wpa_wnmsleep_gtk_subelem(sta->wpa_sm, pos);
 114                 pos += gtk_elem_len;
 115                 wpa_printf(MSG_DEBUG, "Pass 4, gtk_len = %d",
 116                            (int) gtk_elem_len);
 117 #ifdef CONFIG_IEEE80211W
 118                 res = wpa_wnmsleep_igtk_subelem(sta->wpa_sm, pos);
 119                 if (res < 0) {
 120                         os_free(wnmtfs_ie);
 121                         os_free(mgmt);
 122                         return -1;
 123                 }
 124                 igtk_elem_len = res;
 125                 pos += igtk_elem_len;
 126                 wpa_printf(MSG_DEBUG, "Pass 4 igtk_len = %d",
 127                            (int) igtk_elem_len);
 128 #endif /* CONFIG_IEEE80211W */
 129
 130                 WPA_PUT_LE16((u8 *)
 131                              &mgmt->u.action.u.wnm_sleep_resp.keydata_len,
 132                              gtk_elem_len + igtk_elem_len);
 133         }
 134         os_memcpy(pos, &wnmsleep_ie, wnmsleep_ie_len);
 135         /* copy TFS IE here */
 136         pos += wnmsleep_ie_len;
 137         if (wnmtfs_ie)
 138                 os_memcpy(pos, wnmtfs_ie, wnmtfs_ie_len);
 139
 140         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_resp) + gtk_elem_len +
 141                 igtk_elem_len + wnmsleep_ie_len + wnmtfs_ie_len;
 142
 143         /* In driver, response frame should be forced to sent when STA is in
 144          * PS mode */
 145         res = hostapd_drv_send_action(hapd, hapd->iface->freq, 0,
 146                                       mgmt->da, &mgmt->u.action.category, len);
 147
 148         if (!res) {
 149                 wpa_printf(MSG_DEBUG, "Successfully send WNM-Sleep Response "
 150                            "frame");
 151
 152                 /* when entering wnmsleep
 153                  * 1. pause the node in driver
 154                  * 2. mark the node so that AP won't update GTK/IGTK during
 155                  * WNM Sleep
 156                  */
 157                 if (wnmsleep_ie.status == WNM_STATUS_SLEEP_ACCEPT &&
 158                     wnmsleep_ie.action_type == WNM_SLEEP_MODE_ENTER) {
 159                         sta->flags |= WLAN_STA_WNM_SLEEP_MODE;
 160                         hostapd_drv_wnm_oper(hapd, WNM_SLEEP_ENTER_CONFIRM,
 161                                              addr, NULL, NULL);
 162                         wpa_set_wnmsleep(sta->wpa_sm, 1);
 163                 }
 164                 /* when exiting wnmsleep
 165                  * 1. unmark the node
 166                  * 2. start GTK/IGTK update if MFP is not used
 167                  * 3. unpause the node in driver
 168                  */
 169                 if ((wnmsleep_ie.status == WNM_STATUS_SLEEP_ACCEPT ||
 170                      wnmsleep_ie.status ==
 171                      WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) &&
 172                     wnmsleep_ie.action_type == WNM_SLEEP_MODE_EXIT) {
 173                         sta->flags &= ~WLAN_STA_WNM_SLEEP_MODE;
 174                         wpa_set_wnmsleep(sta->wpa_sm, 0);
 175                         hostapd_drv_wnm_oper(hapd, WNM_SLEEP_EXIT_CONFIRM,
 176                                              addr, NULL, NULL);
 177                         if (!wpa_auth_uses_mfp(sta->wpa_sm))
 178                                 wpa_wnmsleep_rekey_gtk(sta->wpa_sm);
 179                 }
 180         } else
 181                 wpa_printf(MSG_DEBUG, "Fail to send WNM-Sleep Response frame");
 182
 183 #undef MAX_GTK_SUBELEM_LEN
 184 #undef MAX_IGTK_SUBELEM_LEN
 185         os_free(wnmtfs_ie);
 186         os_free(mgmt);
 187         return res;
 188 }
 189
 190
 191 static void ieee802_11_rx_wnmsleep_req(struct hostapd_data *hapd,
 192                                        const u8 *addr, const u8 *frm, int len)
 193 {
 194         /* Dialog Token [1] | WNM-Sleep Mode IE | TFS Response IE */
 195         const u8 *pos = frm;
 196         u8 dialog_token;
 197         struct wnm_sleep_element *wnmsleep_ie = NULL;
 198         /* multiple TFS Req IE (assuming consecutive) */
 199         u8 *tfsreq_ie_start = NULL;
 200         u8 *tfsreq_ie_end = NULL;
 201         u16 tfsreq_ie_len = 0;
 202
 203         dialog_token = *pos++;
 204         while (pos + 1 < frm + len) {
 205                 u8 ie_len = pos[1];
 206                 if (pos + 2 + ie_len > frm + len)
 207                         break;
 208                 if (*pos == WLAN_EID_WNMSLEEP)
 209                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 210                 else if (*pos == WLAN_EID_TFS_REQ) {
 211                         if (!tfsreq_ie_start)
 212                                 tfsreq_ie_start = (u8 *) pos;
 213                         tfsreq_ie_end = (u8 *) pos;
 214                 } else
 215                         wpa_printf(MSG_DEBUG, "WNM: EID %d not recognized",
 216                                    *pos);
 217                 pos += ie_len + 2;
 218         }
 219
 220         if (!wnmsleep_ie) {
 221                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 222                 return;
 223         }
 224
 225         if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER &&
 226             tfsreq_ie_start && tfsreq_ie_end &&
 227             tfsreq_ie_end - tfsreq_ie_start >= 0) {
 228                 tfsreq_ie_len = (tfsreq_ie_end + tfsreq_ie_end[1] + 2) -
 229                         tfsreq_ie_start;
 230                 wpa_printf(MSG_DEBUG, "TFS Req IE(s) found");
 231                 /* pass the TFS Req IE(s) to driver for processing */
 232                 if (ieee80211_11_set_tfs_ie(hapd, addr, tfsreq_ie_start,
 233                                             &tfsreq_ie_len,
 234                                             WNM_SLEEP_TFS_REQ_IE_SET))
 235                         wpa_printf(MSG_DEBUG, "Fail to set TFS Req IE");
 236         }
 237
 238         ieee802_11_send_wnmsleep_resp(hapd, addr, dialog_token,
 239                                       wnmsleep_ie->action_type,
 240                                       le_to_host16(wnmsleep_ie->intval));
 241
 242         if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 243                 /* clear the tfs after sending the resp frame */
 244                 ieee80211_11_set_tfs_ie(hapd, addr, tfsreq_ie_start,
 245                                         &tfsreq_ie_len, WNM_SLEEP_TFS_IE_DEL);
 246         }
 247 }
 248
 249
 250 static int ieee802_11_send_bss_trans_mgmt_request(struct hostapd_data *hapd,
 251                                                   const u8 *addr,
 252                                                   u8 dialog_token,
 253                                                   const char *url)
 254 {
 255         struct ieee80211_mgmt *mgmt;
 256         size_t url_len, len;
 257         u8 *pos;
 258         int res;
 259
 260         if (url)
 261                 url_len = os_strlen(url);
 262         else
 263                 url_len = 0;
 264
 265         mgmt = os_zalloc(sizeof(*mgmt) + (url_len ? 1 + url_len : 0));
 266         if (mgmt == NULL)
 267                 return -1;
 268         os_memcpy(mgmt->da, addr, ETH_ALEN);
 269         os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
 270         os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN);
 271         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 272                                            WLAN_FC_STYPE_ACTION);
 273         mgmt->u.action.category = WLAN_ACTION_WNM;
 274         mgmt->u.action.u.bss_tm_req.action = WNM_BSS_TRANS_MGMT_REQ;
 275         mgmt->u.action.u.bss_tm_req.dialog_token = dialog_token;
 276         mgmt->u.action.u.bss_tm_req.req_mode = 0;
 277         mgmt->u.action.u.bss_tm_req.disassoc_timer = host_to_le16(0);
 278         mgmt->u.action.u.bss_tm_req.validity_interval = 1;
 279         pos = mgmt->u.action.u.bss_tm_req.variable;
 280         if (url) {
 281                 *pos++ += url_len;
 282                 os_memcpy(pos, url, url_len);
 283                 pos += url_len;
 284         }
 285
 286         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Request to "
 287                    MACSTR " dialog_token=%u req_mode=0x%x disassoc_timer=%u "
 288                    "validity_interval=%u",
 289                    MAC2STR(addr), dialog_token,
 290                    mgmt->u.action.u.bss_tm_req.req_mode,
 291                    le_to_host16(mgmt->u.action.u.bss_tm_req.disassoc_timer),
 292                    mgmt->u.action.u.bss_tm_req.validity_interval);
 293
 294         len = pos - &mgmt->u.action.category;
 295         res = hostapd_drv_send_action(hapd, hapd->iface->freq, 0,
 296                                       mgmt->da, &mgmt->u.action.category, len);
 297         os_free(mgmt);
 298         return res;
 299 }
 300
 301
 302 static void ieee802_11_rx_bss_trans_mgmt_query(struct hostapd_data *hapd,
 303                                                const u8 *addr, const u8 *frm,
 304                                                size_t len)
 305 {
 306         u8 dialog_token, reason;
 307         const u8 *pos, *end;
 308
 309         if (len < 2) {
 310                 wpa_printf(MSG_DEBUG, "WNM: Ignore too short BSS Transition Management Query from "
 311                            MACSTR, MAC2STR(addr));
 312                 return;
 313         }
 314
 315         pos = frm;
 316         end = pos + len;
 317         dialog_token = *pos++;
 318         reason = *pos++;
 319
 320         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Query from "
 321                    MACSTR " dialog_token=%u reason=%u",
 322                    MAC2STR(addr), dialog_token, reason);
 323
 324         wpa_hexdump(MSG_DEBUG, "WNM: BSS Transition Candidate List Entries",
 325                     pos, end - pos);
 326
 327         ieee802_11_send_bss_trans_mgmt_request(hapd, addr, dialog_token, NULL);
 328 }
 329
 330
 331 static void ieee802_11_rx_bss_trans_mgmt_resp(struct hostapd_data *hapd,
 332                                               const u8 *addr, const u8 *frm,
 333                                               size_t len)
 334 {
 335         u8 dialog_token, status_code, bss_termination_delay;
 336         const u8 *pos, *end;
 337
 338         if (len < 3) {
 339                 wpa_printf(MSG_DEBUG, "WNM: Ignore too short BSS Transition Management Response from "
 340                            MACSTR, MAC2STR(addr));
 341                 return;
 342         }
 343
 344         pos = frm;
 345         end = pos + len;
 346         dialog_token = *pos++;
 347         status_code = *pos++;
 348         bss_termination_delay = *pos++;
 349
 350         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Response from "
 351                    MACSTR " dialog_token=%u status_code=%u "
 352                    "bss_termination_delay=%u", MAC2STR(addr), dialog_token,
 353                    status_code, bss_termination_delay);
 354
 355         if (status_code == WNM_BSS_TM_ACCEPT) {
 356                 if (end - pos < ETH_ALEN) {
 357                         wpa_printf(MSG_DEBUG, "WNM: not enough room for Target BSSID field");
 358                         return;
 359                 }
 360                 wpa_printf(MSG_DEBUG, "WNM: Target BSSID: " MACSTR,
 361                            MAC2STR(pos));
 362                 wpa_msg(hapd->msg_ctx, MSG_INFO, BSS_TM_RESP MACSTR
 363                         " status_code=%u bss_termination_delay=%u target_bssid="
 364                         MACSTR,
 365                         MAC2STR(addr), status_code, bss_termination_delay,
 366                         MAC2STR(pos));
 367                 pos += ETH_ALEN;
 368         } else {
 369                 wpa_msg(hapd->msg_ctx, MSG_INFO, BSS_TM_RESP MACSTR
 370                         " status_code=%u bss_termination_delay=%u",
 371                         MAC2STR(addr), status_code, bss_termination_delay);
 372         }
 373
 374         wpa_hexdump(MSG_DEBUG, "WNM: BSS Transition Candidate List Entries",
 375                     pos, end - pos);
 376 }
 377
 378
 379 int ieee802_11_rx_wnm_action_ap(struct hostapd_data *hapd,
 380                                 const struct ieee80211_mgmt *mgmt, size_t len)
 381 {
 382         u8 action;
 383         const u8 *payload;
 384         size_t plen;
 385
 386         if (len < IEEE80211_HDRLEN + 2)
 387                 return -1;
 388
 389         payload = ((const u8 *) mgmt) + IEEE80211_HDRLEN + 1;
 390         action = *payload++;
 391         plen = len - IEEE80211_HDRLEN - 2;
 392
 393         switch (action) {
 394         case WNM_BSS_TRANS_MGMT_QUERY:
 395                 ieee802_11_rx_bss_trans_mgmt_query(hapd, mgmt->sa, payload,
 396                                                    plen);
 397                 return 0;
 398         case WNM_BSS_TRANS_MGMT_RESP:
 399                 ieee802_11_rx_bss_trans_mgmt_resp(hapd, mgmt->sa, payload,
 400                                                   plen);
 401                 return 0;
 402         case WNM_SLEEP_MODE_REQ:
 403                 ieee802_11_rx_wnmsleep_req(hapd, mgmt->sa, payload, plen);
 404                 return 0;
 405         }
 406
 407         wpa_printf(MSG_DEBUG, "WNM: Unsupported WNM Action %u from " MACSTR,
 408                    action, MAC2STR(mgmt->sa));
 409         return -1;
 410 }
 411
 412
 413 int wnm_send_disassoc_imminent(struct hostapd_data *hapd,
 414                                struct sta_info *sta, int disassoc_timer)
 415 {
 416         u8 buf[1000], *pos;
 417         struct ieee80211_mgmt *mgmt;
 418
 419         os_memset(buf, 0, sizeof(buf));
 420         mgmt = (struct ieee80211_mgmt *) buf;
 421         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 422                                            WLAN_FC_STYPE_ACTION);
 423         os_memcpy(mgmt->da, sta->addr, ETH_ALEN);
 424         os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
 425         os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN);
 426         mgmt->u.action.category = WLAN_ACTION_WNM;
 427         mgmt->u.action.u.bss_tm_req.action = WNM_BSS_TRANS_MGMT_REQ;
 428         mgmt->u.action.u.bss_tm_req.dialog_token = 1;
 429         mgmt->u.action.u.bss_tm_req.req_mode =
 430                 WNM_BSS_TM_REQ_DISASSOC_IMMINENT;
 431         mgmt->u.action.u.bss_tm_req.disassoc_timer =
 432                 host_to_le16(disassoc_timer);
 433         mgmt->u.action.u.bss_tm_req.validity_interval = 0;
 434
 435         pos = mgmt->u.action.u.bss_tm_req.variable;
 436
 437         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Request frame to indicate imminent disassociation (disassoc_timer=%d) to "
 438                    MACSTR, disassoc_timer, MAC2STR(sta->addr));
 439         if (hostapd_drv_send_mlme(hapd, buf, pos - buf, 0) < 0) {
 440                 wpa_printf(MSG_DEBUG, "Failed to send BSS Transition "
 441                            "Management Request frame");
 442                 return -1;
 443         }
 444
 445         return 0;
 446 }
 447
 448
 449 static void set_disassoc_timer(struct hostapd_data *hapd, struct sta_info *sta,
 450                                int disassoc_timer)
 451 {
 452         int timeout, beacon_int;
 453
 454         /*
 455          * Prevent STA from reconnecting using cached PMKSA to force
 456          * full authentication with the authentication server (which may
 457          * decide to reject the connection),
 458          */
 459         wpa_auth_pmksa_remove(hapd->wpa_auth, sta->addr);
 460
 461         beacon_int = hapd->iconf->beacon_int;
 462         if (beacon_int < 1)
 463                 beacon_int = 100; /* best guess */
 464         /* Calculate timeout in ms based on beacon_int in TU */
 465         timeout = disassoc_timer * beacon_int * 128 / 125;
 466         wpa_printf(MSG_DEBUG, "Disassociation timer for " MACSTR
 467                    " set to %d ms", MAC2STR(sta->addr), timeout);
 468
 469         sta->timeout_next = STA_DISASSOC_FROM_CLI;
 470         eloop_cancel_timeout(ap_handle_timer, hapd, sta);
 471         eloop_register_timeout(timeout / 1000,
 472                                timeout % 1000 * 1000,
 473                                ap_handle_timer, hapd, sta);
 474 }
 475
 476
 477 int wnm_send_ess_disassoc_imminent(struct hostapd_data *hapd,
 478                                    struct sta_info *sta, const char *url,
 479                                    int disassoc_timer)
 480 {
 481         u8 buf[1000], *pos;
 482         struct ieee80211_mgmt *mgmt;
 483         size_t url_len;
 484
 485         os_memset(buf, 0, sizeof(buf));
 486         mgmt = (struct ieee80211_mgmt *) buf;
 487         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 488                                            WLAN_FC_STYPE_ACTION);
 489         os_memcpy(mgmt->da, sta->addr, ETH_ALEN);
 490         os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
 491         os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN);
 492         mgmt->u.action.category = WLAN_ACTION_WNM;
 493         mgmt->u.action.u.bss_tm_req.action = WNM_BSS_TRANS_MGMT_REQ;
 494         mgmt->u.action.u.bss_tm_req.dialog_token = 1;
 495         mgmt->u.action.u.bss_tm_req.req_mode =
 496                 WNM_BSS_TM_REQ_DISASSOC_IMMINENT |
 497                 WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT;
 498         mgmt->u.action.u.bss_tm_req.disassoc_timer =
 499                 host_to_le16(disassoc_timer);
 500         mgmt->u.action.u.bss_tm_req.validity_interval = 0x01;
 501
 502         pos = mgmt->u.action.u.bss_tm_req.variable;
 503
 504         /* Session Information URL */
 505         url_len = os_strlen(url);
 506         if (url_len > 255)
 507                 return -1;
 508         *pos++ = url_len;
 509         os_memcpy(pos, url, url_len);
 510         pos += url_len;
 511
 512         if (hostapd_drv_send_mlme(hapd, buf, pos - buf, 0) < 0) {
 513                 wpa_printf(MSG_DEBUG, "Failed to send BSS Transition "
 514                            "Management Request frame");
 515                 return -1;
 516         }
 517
 518         if (disassoc_timer) {
 519                 /* send disassociation frame after time-out */
 520                 set_disassoc_timer(hapd, sta, disassoc_timer);
 521         }
 522
 523         return 0;
 524 }
 525
 526
 527 int wnm_send_bss_tm_req(struct hostapd_data *hapd, struct sta_info *sta,
 528                         u8 req_mode, int disassoc_timer, u8 valid_int,
 529                         const u8 *bss_term_dur, const char *url,
 530                         const u8 *nei_rep, size_t nei_rep_len)
 531 {
 532         u8 *buf, *pos;
 533         struct ieee80211_mgmt *mgmt;
 534         size_t url_len;
 535
 536         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Request to "
 537                    MACSTR " req_mode=0x%x disassoc_timer=%d valid_int=0x%x",
 538                    MAC2STR(sta->addr), req_mode, disassoc_timer, valid_int);
 539         buf = os_zalloc(1000 + nei_rep_len);
 540         if (buf == NULL)
 541                 return -1;
 542         mgmt = (struct ieee80211_mgmt *) buf;
 543         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 544                                            WLAN_FC_STYPE_ACTION);
 545         os_memcpy(mgmt->da, sta->addr, ETH_ALEN);
 546         os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN);
 547         os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN);
 548         mgmt->u.action.category = WLAN_ACTION_WNM;
 549         mgmt->u.action.u.bss_tm_req.action = WNM_BSS_TRANS_MGMT_REQ;
 550         mgmt->u.action.u.bss_tm_req.dialog_token = 1;
 551         mgmt->u.action.u.bss_tm_req.req_mode = req_mode;
 552         mgmt->u.action.u.bss_tm_req.disassoc_timer =
 553                 host_to_le16(disassoc_timer);
 554         mgmt->u.action.u.bss_tm_req.validity_interval = valid_int;
 555
 556         pos = mgmt->u.action.u.bss_tm_req.variable;
 557
 558         if ((req_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) &&
 559             bss_term_dur) {
 560                 os_memcpy(pos, bss_term_dur, 12);
 561                 pos += 12;
 562         }
 563
 564         if (url) {
 565                 /* Session Information URL */
 566                 url_len = os_strlen(url);
 567                 if (url_len > 255) {
 568                         os_free(buf);
 569                         return -1;
 570                 }
 571
 572                 *pos++ = url_len;
 573                 os_memcpy(pos, url, url_len);
 574                 pos += url_len;
 575         }
 576
 577         if (nei_rep) {
 578                 os_memcpy(pos, nei_rep, nei_rep_len);
 579                 pos += nei_rep_len;
 580         }
 581
 582         if (hostapd_drv_send_mlme(hapd, buf, pos - buf, 0) < 0) {
 583                 wpa_printf(MSG_DEBUG,
 584                            "Failed to send BSS Transition Management Request frame");
 585                 os_free(buf);
 586                 return -1;
 587         }
 588         os_free(buf);
 589
 590         if (disassoc_timer) {
 591                 /* send disassociation frame after time-out */
 592                 set_disassoc_timer(hapd, sta, disassoc_timer);
 593         }
 594
 595         return 0;
 596 }