wpa_supplicant/wnm_sta.c

   1 /*
   2  * wpa_supplicant - WNM
   3  * Copyright (c) 2011-2012, 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 "rsn_supp/wpa.h"
  14 #include "wpa_supplicant_i.h"
  15 #include "driver_i.h"
  16 #include "scan.h"
  17 #include "ctrl_iface.h"
  18 #include "bss.h"
  19 #include "wnm_sta.h"
  20
  21 #define MAX_TFS_IE_LEN  1024
  22 #define WNM_MAX_NEIGHBOR_REPORT 10
  23
  24
  25 /* get the TFS IE from driver */
  26 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
  27                                    u16 *buf_len, enum wnm_oper oper)
  28 {
  29         wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper);
  30
  31         return wpa_drv_wnm_oper(wpa_s, oper, wpa_s->bssid, buf, buf_len);
  32 }
  33
  34
  35 /* set the TFS IE to driver */
  36 static int ieee80211_11_set_tfs_ie(struct wpa_supplicant *wpa_s,
  37                                    const u8 *addr, u8 *buf, u16 *buf_len,
  38                                    enum wnm_oper oper)
  39 {
  40         wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper);
  41
  42         return wpa_drv_wnm_oper(wpa_s, oper, addr, buf, buf_len);
  43 }
  44
  45
  46 /* MLME-SLEEPMODE.request */
  47 int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
  48                                  u8 action, u16 intval, struct wpabuf *tfs_req)
  49 {
  50         struct ieee80211_mgmt *mgmt;
  51         int res;
  52         size_t len;
  53         struct wnm_sleep_element *wnmsleep_ie;
  54         u8 *wnmtfs_ie;
  55         u8 wnmsleep_ie_len;
  56         u16 wnmtfs_ie_len;  /* possibly multiple IE(s) */
  57         enum wnm_oper tfs_oper = action == 0 ? WNM_SLEEP_TFS_REQ_IE_ADD :
  58                 WNM_SLEEP_TFS_REQ_IE_NONE;
  59
  60         wpa_printf(MSG_DEBUG, "WNM: Request to send WNM-Sleep Mode Request "
  61                    "action=%s to " MACSTR,
  62                    action == 0 ? "enter" : "exit",
  63                    MAC2STR(wpa_s->bssid));
  64
  65         /* WNM-Sleep Mode IE */
  66         wnmsleep_ie_len = sizeof(struct wnm_sleep_element);
  67         wnmsleep_ie = os_zalloc(sizeof(struct wnm_sleep_element));
  68         if (wnmsleep_ie == NULL)
  69                 return -1;
  70         wnmsleep_ie->eid = WLAN_EID_WNMSLEEP;
  71         wnmsleep_ie->len = wnmsleep_ie_len - 2;
  72         wnmsleep_ie->action_type = action;
  73         wnmsleep_ie->status = WNM_STATUS_SLEEP_ACCEPT;
  74         wnmsleep_ie->intval = host_to_le16(intval);
  75         wpa_hexdump(MSG_DEBUG, "WNM: WNM-Sleep Mode element",
  76                     (u8 *) wnmsleep_ie, wnmsleep_ie_len);
  77
  78         /* TFS IE(s) */
  79         if (tfs_req) {
  80                 wnmtfs_ie_len = wpabuf_len(tfs_req);
  81                 wnmtfs_ie = os_malloc(wnmtfs_ie_len);
  82                 if (wnmtfs_ie == NULL) {
  83                         os_free(wnmsleep_ie);
  84                         return -1;
  85                 }
  86                 os_memcpy(wnmtfs_ie, wpabuf_head(tfs_req), wnmtfs_ie_len);
  87         } else {
  88                 wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN);
  89                 if (wnmtfs_ie == NULL) {
  90                         os_free(wnmsleep_ie);
  91                         return -1;
  92                 }
  93                 if (ieee80211_11_get_tfs_ie(wpa_s, wnmtfs_ie, &wnmtfs_ie_len,
  94                                             tfs_oper)) {
  95                         wnmtfs_ie_len = 0;
  96                         os_free(wnmtfs_ie);
  97                         wnmtfs_ie = NULL;
  98                 }
  99         }
 100         wpa_hexdump(MSG_DEBUG, "WNM: TFS Request element",
 101                     (u8 *) wnmtfs_ie, wnmtfs_ie_len);
 102
 103         mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + wnmtfs_ie_len);
 104         if (mgmt == NULL) {
 105                 wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for "
 106                            "WNM-Sleep Request action frame");
 107                 os_free(wnmsleep_ie);
 108                 os_free(wnmtfs_ie);
 109                 return -1;
 110         }
 111
 112         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 113         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 114         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 115         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 116                                            WLAN_FC_STYPE_ACTION);
 117         mgmt->u.action.category = WLAN_ACTION_WNM;
 118         mgmt->u.action.u.wnm_sleep_req.action = WNM_SLEEP_MODE_REQ;
 119         mgmt->u.action.u.wnm_sleep_req.dialogtoken = 1;
 120         os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable, wnmsleep_ie,
 121                   wnmsleep_ie_len);
 122         /* copy TFS IE here */
 123         if (wnmtfs_ie_len > 0) {
 124                 os_memcpy(mgmt->u.action.u.wnm_sleep_req.variable +
 125                           wnmsleep_ie_len, wnmtfs_ie, wnmtfs_ie_len);
 126         }
 127
 128         len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_req) + wnmsleep_ie_len +
 129                 wnmtfs_ie_len;
 130
 131         res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 132                                   wpa_s->own_addr, wpa_s->bssid,
 133                                   &mgmt->u.action.category, len, 0);
 134         if (res < 0)
 135                 wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 136                            "(action=%d, intval=%d)", action, intval);
 137
 138         os_free(wnmsleep_ie);
 139         os_free(wnmtfs_ie);
 140         os_free(mgmt);
 141
 142         return res;
 143 }
 144
 145
 146 static void wnm_sleep_mode_enter_success(struct wpa_supplicant *wpa_s,
 147                                          u8 *tfsresp_ie_start,
 148                                          u8 *tfsresp_ie_end)
 149 {
 150         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_CONFIRM,
 151                          wpa_s->bssid, NULL, NULL);
 152         /* remove GTK/IGTK ?? */
 153
 154         /* set the TFS Resp IE(s) */
 155         if (tfsresp_ie_start && tfsresp_ie_end &&
 156             tfsresp_ie_end - tfsresp_ie_start >= 0) {
 157                 u16 tfsresp_ie_len;
 158                 tfsresp_ie_len = (tfsresp_ie_end + tfsresp_ie_end[1] + 2) -
 159                         tfsresp_ie_start;
 160                 wpa_printf(MSG_DEBUG, "TFS Resp IE(s) found");
 161                 /* pass the TFS Resp IE(s) to driver for processing */
 162                 if (ieee80211_11_set_tfs_ie(wpa_s, wpa_s->bssid,
 163                                             tfsresp_ie_start,
 164                                             &tfsresp_ie_len,
 165                                             WNM_SLEEP_TFS_RESP_IE_SET))
 166                         wpa_printf(MSG_DEBUG, "WNM: Fail to set TFS Resp IE");
 167         }
 168 }
 169
 170
 171 static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
 172                                         const u8 *frm, u16 key_len_total)
 173 {
 174         u8 *ptr, *end;
 175         u8 gtk_len;
 176
 177         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_CONFIRM,  wpa_s->bssid,
 178                          NULL, NULL);
 179
 180         /* Install GTK/IGTK */
 181
 182         /* point to key data field */
 183         ptr = (u8 *) frm + 1 + 1 + 2;
 184         end = ptr + key_len_total;
 185         wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
 186
 187         while (ptr + 1 < end) {
 188                 if (ptr + 2 + ptr[1] > end) {
 189                         wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
 190                                    "length");
 191                         if (end > ptr) {
 192                                 wpa_hexdump(MSG_DEBUG, "WNM: Remaining data",
 193                                             ptr, end - ptr);
 194                         }
 195                         break;
 196                 }
 197                 if (*ptr == WNM_SLEEP_SUBELEM_GTK) {
 198                         if (ptr[1] < 11 + 5) {
 199                                 wpa_printf(MSG_DEBUG, "WNM: Too short GTK "
 200                                            "subelem");
 201                                 break;
 202                         }
 203                         gtk_len = *(ptr + 4);
 204                         if (ptr[1] < 11 + gtk_len ||
 205                             gtk_len < 5 || gtk_len > 32) {
 206                                 wpa_printf(MSG_DEBUG, "WNM: Invalid GTK "
 207                                            "subelem");
 208                                 break;
 209                         }
 210                         wpa_wnmsleep_install_key(
 211                                 wpa_s->wpa,
 212                                 WNM_SLEEP_SUBELEM_GTK,
 213                                 ptr);
 214                         ptr += 13 + gtk_len;
 215 #ifdef CONFIG_IEEE80211W
 216                 } else if (*ptr == WNM_SLEEP_SUBELEM_IGTK) {
 217                         if (ptr[1] < 2 + 6 + WPA_IGTK_LEN) {
 218                                 wpa_printf(MSG_DEBUG, "WNM: Too short IGTK "
 219                                            "subelem");
 220                                 break;
 221                         }
 222                         wpa_wnmsleep_install_key(wpa_s->wpa,
 223                                                  WNM_SLEEP_SUBELEM_IGTK, ptr);
 224                         ptr += 10 + WPA_IGTK_LEN;
 225 #endif /* CONFIG_IEEE80211W */
 226                 } else
 227                         break; /* skip the loop */
 228         }
 229 }
 230
 231
 232 static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 233                                         const u8 *frm, int len)
 234 {
 235         /*
 236          * Action [1] | Diaglog Token [1] | Key Data Len [2] | Key Data |
 237          * WNM-Sleep Mode IE | TFS Response IE
 238          */
 239         u8 *pos = (u8 *) frm; /* point to action field */
 240         u16 key_len_total = le_to_host16(*((u16 *)(frm+2)));
 241         struct wnm_sleep_element *wnmsleep_ie = NULL;
 242         /* multiple TFS Resp IE (assuming consecutive) */
 243         u8 *tfsresp_ie_start = NULL;
 244         u8 *tfsresp_ie_end = NULL;
 245
 246         wpa_printf(MSG_DEBUG, "action=%d token = %d key_len_total = %d",
 247                    frm[0], frm[1], key_len_total);
 248         pos += 4 + key_len_total;
 249         if (pos > frm + len) {
 250                 wpa_printf(MSG_INFO, "WNM: Too short frame for Key Data field");
 251                 return;
 252         }
 253         while (pos - frm < len) {
 254                 u8 ie_len = *(pos + 1);
 255                 if (pos + 2 + ie_len > frm + len) {
 256                         wpa_printf(MSG_INFO, "WNM: Invalid IE len %u", ie_len);
 257                         break;
 258                 }
 259                 wpa_hexdump(MSG_DEBUG, "WNM: Element", pos, 2 + ie_len);
 260                 if (*pos == WLAN_EID_WNMSLEEP)
 261                         wnmsleep_ie = (struct wnm_sleep_element *) pos;
 262                 else if (*pos == WLAN_EID_TFS_RESP) {
 263                         if (!tfsresp_ie_start)
 264                                 tfsresp_ie_start = pos;
 265                         tfsresp_ie_end = pos;
 266                 } else
 267                         wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos);
 268                 pos += ie_len + 2;
 269         }
 270
 271         if (!wnmsleep_ie) {
 272                 wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found");
 273                 return;
 274         }
 275
 276         if (wnmsleep_ie->status == WNM_STATUS_SLEEP_ACCEPT ||
 277             wnmsleep_ie->status == WNM_STATUS_SLEEP_EXIT_ACCEPT_GTK_UPDATE) {
 278                 wpa_printf(MSG_DEBUG, "Successfully recv WNM-Sleep Response "
 279                            "frame (action=%d, intval=%d)",
 280                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 281                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER) {
 282                         wnm_sleep_mode_enter_success(wpa_s, tfsresp_ie_start,
 283                                                      tfsresp_ie_end);
 284                 } else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT) {
 285                         wnm_sleep_mode_exit_success(wpa_s, frm, key_len_total);
 286                 }
 287         } else {
 288                 wpa_printf(MSG_DEBUG, "Reject recv WNM-Sleep Response frame "
 289                            "(action=%d, intval=%d)",
 290                            wnmsleep_ie->action_type, wnmsleep_ie->intval);
 291                 if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_ENTER)
 292                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_ENTER_FAIL,
 293                                          wpa_s->bssid, NULL, NULL);
 294                 else if (wnmsleep_ie->action_type == WNM_SLEEP_MODE_EXIT)
 295                         wpa_drv_wnm_oper(wpa_s, WNM_SLEEP_EXIT_FAIL,
 296                                          wpa_s->bssid, NULL, NULL);
 297         }
 298 }
 299
 300
 301 void wnm_deallocate_memory(struct wpa_supplicant *wpa_s)
 302 {
 303         int i;
 304
 305         for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
 306                 os_free(wpa_s->wnm_neighbor_report_elements[i].tsf_info);
 307                 os_free(wpa_s->wnm_neighbor_report_elements[i].con_coun_str);
 308                 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_tran_can);
 309                 os_free(wpa_s->wnm_neighbor_report_elements[i].bss_term_dur);
 310                 os_free(wpa_s->wnm_neighbor_report_elements[i].bearing);
 311                 os_free(wpa_s->wnm_neighbor_report_elements[i].meas_pilot);
 312                 os_free(wpa_s->wnm_neighbor_report_elements[i].rrm_cap);
 313                 os_free(wpa_s->wnm_neighbor_report_elements[i].mul_bssid);
 314         }
 315
 316         os_free(wpa_s->wnm_neighbor_report_elements);
 317         wpa_s->wnm_neighbor_report_elements = NULL;
 318 }
 319
 320
 321 static void wnm_parse_neighbor_report_elem(struct neighbor_report *rep,
 322                                            u8 id, u8 elen, const u8 *pos)
 323 {
 324         switch (id) {
 325         case WNM_NEIGHBOR_TSF:
 326                 if (elen < 2 + 2) {
 327                         wpa_printf(MSG_DEBUG, "WNM: Too short TSF");
 328                         break;
 329                 }
 330                 rep->tsf_info = os_zalloc(sizeof(struct tsf_info));
 331                 if (rep->tsf_info == NULL)
 332                         break;
 333                 rep->tsf_info->present = 1;
 334                 os_memcpy(rep->tsf_info->tsf_offset, pos, 2);
 335                 os_memcpy(rep->tsf_info->beacon_interval, pos + 2, 2);
 336                 break;
 337         case WNM_NEIGHBOR_CONDENSED_COUNTRY_STRING:
 338                 if (elen < 2) {
 339                         wpa_printf(MSG_DEBUG, "WNM: Too short condensed "
 340                                    "country string");
 341                         break;
 342                 }
 343                 rep->con_coun_str =
 344                         os_zalloc(sizeof(struct condensed_country_string));
 345                 if (rep->con_coun_str == NULL)
 346                         break;
 347                 rep->con_coun_str->present = 1;
 348                 os_memcpy(rep->con_coun_str->country_string, pos, 2);
 349                 break;
 350         case WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE:
 351                 if (elen < 1) {
 352                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS transition "
 353                                    "candidate");
 354                         break;
 355                 }
 356                 rep->bss_tran_can =
 357                         os_zalloc(sizeof(struct bss_transition_candidate));
 358                 if (rep->bss_tran_can == NULL)
 359                         break;
 360                 rep->bss_tran_can->present = 1;
 361                 rep->bss_tran_can->preference = pos[0];
 362                 break;
 363         case WNM_NEIGHBOR_BSS_TERMINATION_DURATION:
 364                 if (elen < 12) {
 365                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS termination "
 366                                    "duration");
 367                         break;
 368                 }
 369                 rep->bss_term_dur =
 370                         os_zalloc(sizeof(struct bss_termination_duration));
 371                 if (rep->bss_term_dur == NULL)
 372                         break;
 373                 rep->bss_term_dur->present = 1;
 374                 os_memcpy(rep->bss_term_dur->duration, pos, 12);
 375                 break;
 376         case WNM_NEIGHBOR_BEARING:
 377                 if (elen < 8) {
 378                         wpa_printf(MSG_DEBUG, "WNM: Too short neighbor "
 379                                    "bearing");
 380                         break;
 381                 }
 382                 rep->bearing = os_zalloc(sizeof(struct bearing));
 383                 if (rep->bearing == NULL)
 384                         break;
 385                 rep->bearing->present = 1;
 386                 os_memcpy(rep->bearing->bearing, pos, 8);
 387                 break;
 388         case WNM_NEIGHBOR_MEASUREMENT_PILOT:
 389                 if (elen < 2) {
 390                         wpa_printf(MSG_DEBUG, "WNM: Too short measurement "
 391                                    "pilot");
 392                         break;
 393                 }
 394                 rep->meas_pilot = os_zalloc(sizeof(struct measurement_pilot));
 395                 if (rep->meas_pilot == NULL)
 396                         break;
 397                 rep->meas_pilot->present = 1;
 398                 rep->meas_pilot->measurement_pilot = pos[0];
 399                 rep->meas_pilot->num_vendor_specific = pos[1];
 400                 os_memcpy(rep->meas_pilot->vendor_specific, pos + 2, elen - 2);
 401                 break;
 402         case WNM_NEIGHBOR_RRM_ENABLED_CAPABILITIES:
 403                 if (elen < 4) {
 404                         wpa_printf(MSG_DEBUG, "WNM: Too short RRM enabled "
 405                                    "capabilities");
 406                         break;
 407                 }
 408                 rep->rrm_cap =
 409                         os_zalloc(sizeof(struct rrm_enabled_capabilities));
 410                 if (rep->rrm_cap == NULL)
 411                         break;
 412                 rep->rrm_cap->present = 1;
 413                 os_memcpy(rep->rrm_cap->capabilities, pos, 4);
 414                 break;
 415         case WNM_NEIGHBOR_MULTIPLE_BSSID:
 416                 if (elen < 2) {
 417                         wpa_printf(MSG_DEBUG, "WNM: Too short multiple BSSID");
 418                         break;
 419                 }
 420                 rep->mul_bssid = os_zalloc(sizeof(struct multiple_bssid));
 421                 if (rep->mul_bssid == NULL)
 422                         break;
 423                 rep->mul_bssid->present = 1;
 424                 rep->mul_bssid->max_bssid_indicator = pos[0];
 425                 rep->mul_bssid->num_vendor_specific = pos[1];
 426                 os_memcpy(rep->mul_bssid->vendor_specific, pos + 2, elen - 2);
 427                 break;
 428         }
 429 }
 430
 431
 432 static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 433                                       const u8 *pos, u8 len,
 434                                       struct neighbor_report *rep)
 435 {
 436         u8 left = len;
 437
 438         if (left < 13) {
 439                 wpa_printf(MSG_DEBUG, "WNM: Too short neighbor report");
 440                 return;
 441         }
 442
 443         os_memcpy(rep->bssid, pos, ETH_ALEN);
 444         os_memcpy(rep->bssid_information, pos + ETH_ALEN, 4);
 445         rep->regulatory_class = *(pos + 10);
 446         rep->channel_number = *(pos + 11);
 447         rep->phy_type = *(pos + 12);
 448
 449         pos += 13;
 450         left -= 13;
 451
 452         while (left >= 2) {
 453                 u8 id, elen;
 454
 455                 id = *pos++;
 456                 elen = *pos++;
 457                 wnm_parse_neighbor_report_elem(rep, id, elen, pos);
 458                 left -= 2 + elen;
 459                 pos += elen;
 460         }
 461 }
 462
 463
 464 static int compare_scan_neighbor_results(struct wpa_supplicant *wpa_s,
 465                                          struct wpa_scan_results *scan_res,
 466                                          struct neighbor_report *neigh_rep,
 467                                          u8 num_neigh_rep, u8 *bssid_to_connect)
 468 {
 469
 470         u8 i, j;
 471
 472         if (scan_res == NULL || num_neigh_rep == 0)
 473                 return 0;
 474
 475         for (i = 0; i < num_neigh_rep; i++) {
 476                 for (j = 0; j < scan_res->num; j++) {
 477                         /* Check for a better RSSI AP */
 478                         if (os_memcmp(scan_res->res[j]->bssid,
 479                                       neigh_rep[i].bssid, ETH_ALEN) == 0 &&
 480                             scan_res->res[j]->level >
 481                             wpa_s->current_bss->level) {
 482                                 /* Got a BSSID with better RSSI value */
 483                                 os_memcpy(bssid_to_connect, neigh_rep[i].bssid,
 484                                           ETH_ALEN);
 485                                 return 1;
 486                         }
 487                 }
 488         }
 489
 490         return 0;
 491 }
 492
 493
 494 static void wnm_send_bss_transition_mgmt_resp(
 495         struct wpa_supplicant *wpa_s, u8 dialog_token,
 496         enum bss_trans_mgmt_status_code status, u8 delay,
 497         const u8 *target_bssid)
 498 {
 499         u8 buf[1000], *pos;
 500         struct ieee80211_mgmt *mgmt;
 501         size_t len;
 502
 503         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Response "
 504                    "to " MACSTR " dialog_token=%u status=%u delay=%d",
 505                    MAC2STR(wpa_s->bssid), dialog_token, status, delay);
 506
 507         mgmt = (struct ieee80211_mgmt *) buf;
 508         os_memset(&buf, 0, sizeof(buf));
 509         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 510         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 511         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 512         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 513                                            WLAN_FC_STYPE_ACTION);
 514         mgmt->u.action.category = WLAN_ACTION_WNM;
 515         mgmt->u.action.u.bss_tm_resp.action = WNM_BSS_TRANS_MGMT_RESP;
 516         mgmt->u.action.u.bss_tm_resp.dialog_token = dialog_token;
 517         mgmt->u.action.u.bss_tm_resp.status_code = status;
 518         mgmt->u.action.u.bss_tm_resp.bss_termination_delay = delay;
 519         pos = mgmt->u.action.u.bss_tm_resp.variable;
 520         if (target_bssid) {
 521                 os_memcpy(pos, target_bssid, ETH_ALEN);
 522                 pos += ETH_ALEN;
 523         }
 524
 525         len = pos - (u8 *) &mgmt->u.action.category;
 526
 527         wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 528                             wpa_s->own_addr, wpa_s->bssid,
 529                             &mgmt->u.action.category, len, 0);
 530 }
 531
 532
 533 void wnm_scan_response(struct wpa_supplicant *wpa_s,
 534                        struct wpa_scan_results *scan_res)
 535 {
 536         u8 bssid[ETH_ALEN];
 537
 538         if (scan_res == NULL) {
 539                 wpa_printf(MSG_ERROR, "Scan result is NULL");
 540                 goto send_bss_resp_fail;
 541         }
 542
 543         /* Compare the Neighbor Report and scan results */
 544         if (compare_scan_neighbor_results(wpa_s, scan_res,
 545                                           wpa_s->wnm_neighbor_report_elements,
 546                                           wpa_s->wnm_num_neighbor_report,
 547                                           bssid) == 1) {
 548                 /* Associate to the network */
 549                 struct wpa_bss *bss;
 550                 struct wpa_ssid *ssid = wpa_s->current_ssid;
 551
 552                 bss = wpa_bss_get_bssid(wpa_s, bssid);
 553                 if (!bss) {
 554                         wpa_printf(MSG_DEBUG, "WNM: Target AP not found from "
 555                                    "BSS table");
 556                         goto send_bss_resp_fail;
 557                 }
 558
 559                 /* Send the BSS Management Response - Accept */
 560                 if (wpa_s->wnm_reply) {
 561                         wnm_send_bss_transition_mgmt_resp(wpa_s,
 562                                                   wpa_s->wnm_dialog_token,
 563                                                   WNM_BSS_TM_ACCEPT,
 564                                                   0, NULL);
 565                 }
 566
 567                 wpa_s->reassociate = 1;
 568                 wpa_supplicant_connect(wpa_s, bss, ssid);
 569                 wnm_deallocate_memory(wpa_s);
 570                 return;
 571         }
 572
 573         /* Send reject response for all the failures */
 574 send_bss_resp_fail:
 575         wnm_deallocate_memory(wpa_s);
 576         if (wpa_s->wnm_reply) {
 577                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 578                                                   wpa_s->wnm_dialog_token,
 579                                                   WNM_BSS_TM_REJECT_UNSPECIFIED,
 580                                                   0, NULL);
 581         }
 582         return;
 583 }
 584
 585
 586 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 587                                              const u8 *pos, const u8 *end,
 588                                              int reply)
 589 {
 590         if (pos + 5 > end)
 591                 return;
 592
 593         wpa_s->wnm_dialog_token = pos[0];
 594         wpa_s->wnm_mode = pos[1];
 595         wpa_s->wnm_dissoc_timer = WPA_GET_LE16(pos + 2);
 596         wpa_s->wnm_validity_interval = pos[4];
 597         wpa_s->wnm_reply = reply;
 598
 599         wpa_printf(MSG_DEBUG, "WNM: BSS Transition Management Request: "
 600                    "dialog_token=%u request_mode=0x%x "
 601                    "disassoc_timer=%u validity_interval=%u",
 602                    wpa_s->wnm_dialog_token, wpa_s->wnm_mode,
 603                    wpa_s->wnm_dissoc_timer, wpa_s->wnm_validity_interval);
 604
 605         pos += 5;
 606
 607         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_BSS_TERMINATION_INCLUDED) {
 608                 if (pos + 12 > end) {
 609                         wpa_printf(MSG_DEBUG, "WNM: Too short BSS TM Request");
 610                         return;
 611                 }
 612                 os_memcpy(wpa_s->wnm_bss_termination_duration, pos, 12);
 613                 pos += 12; /* BSS Termination Duration */
 614         }
 615
 616         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_ESS_DISASSOC_IMMINENT) {
 617                 char url[256];
 618                 if (pos + 1 > end || pos + 1 + pos[0] > end) {
 619                         wpa_printf(MSG_DEBUG, "WNM: Invalid BSS Transition "
 620                                    "Management Request (URL)");
 621                         return;
 622                 }
 623                 os_memcpy(url, pos + 1, pos[0]);
 624                 url[pos[0]] = '\0';
 625                 pos += 1 + pos[0];
 626                 wpa_msg(wpa_s, MSG_INFO, "WNM: ESS Disassociation Imminent - "
 627                         "session_info_url=%s", url);
 628         }
 629
 630         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_DISASSOC_IMMINENT) {
 631                 wpa_msg(wpa_s, MSG_INFO, "WNM: Disassociation Imminent - "
 632                         "Disassociation Timer %u", wpa_s->wnm_dissoc_timer);
 633                 if (wpa_s->wnm_dissoc_timer && !wpa_s->scanning) {
 634                         /* TODO: mark current BSS less preferred for
 635                          * selection */
 636                         wpa_printf(MSG_DEBUG, "Trying to find another BSS");
 637                         wpa_supplicant_req_scan(wpa_s, 0, 0);
 638                 }
 639         }
 640
 641         if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 642                 wpa_msg(wpa_s, MSG_INFO, "WNM: Preferred List Available");
 643                 wpa_s->wnm_num_neighbor_report = 0;
 644                 os_free(wpa_s->wnm_neighbor_report_elements);
 645                 wpa_s->wnm_neighbor_report_elements = os_zalloc(
 646                         WNM_MAX_NEIGHBOR_REPORT *
 647                         sizeof(struct neighbor_report));
 648                 if (wpa_s->wnm_neighbor_report_elements == NULL)
 649                         return;
 650
 651                 while (pos + 2 <= end &&
 652                        wpa_s->wnm_num_neighbor_report < WNM_MAX_NEIGHBOR_REPORT)
 653                 {
 654                         u8 tag = *pos++;
 655                         u8 len = *pos++;
 656
 657                         wpa_printf(MSG_DEBUG, "WNM: Neighbor report tag %u",
 658                                    tag);
 659                         if (pos + len > end) {
 660                                 wpa_printf(MSG_DEBUG, "WNM: Truncated request");
 661                                 return;
 662                         }
 663                         wnm_parse_neighbor_report(
 664                                 wpa_s, pos, len,
 665                                 &wpa_s->wnm_neighbor_report_elements[
 666                                         wpa_s->wnm_num_neighbor_report]);
 667
 668                         pos += len;
 669                         wpa_s->wnm_num_neighbor_report++;
 670                 }
 671
 672                 wpa_s->scan_res_handler = wnm_scan_response;
 673                 wpa_supplicant_req_scan(wpa_s, 0, 0);
 674         } else if (reply) {
 675                 wpa_msg(wpa_s, MSG_INFO, "WNM: BSS Transition Management "
 676                         "Request Mode is zero");
 677                 wnm_send_bss_transition_mgmt_resp(wpa_s,
 678                                                   wpa_s->wnm_dialog_token,
 679                                                   WNM_BSS_TM_REJECT_UNSPECIFIED,
 680                                                   0, NULL);
 681         }
 682 }
 683
 684
 685 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 686                                        u8 query_reason)
 687 {
 688         u8 buf[1000], *pos;
 689         struct ieee80211_mgmt *mgmt;
 690         size_t len;
 691         int ret;
 692
 693         wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
 694                    MACSTR " query_reason=%u",
 695                    MAC2STR(wpa_s->bssid), query_reason);
 696
 697         mgmt = (struct ieee80211_mgmt *) buf;
 698         os_memset(&buf, 0, sizeof(buf));
 699         os_memcpy(mgmt->da, wpa_s->bssid, ETH_ALEN);
 700         os_memcpy(mgmt->sa, wpa_s->own_addr, ETH_ALEN);
 701         os_memcpy(mgmt->bssid, wpa_s->bssid, ETH_ALEN);
 702         mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT,
 703                                            WLAN_FC_STYPE_ACTION);
 704         mgmt->u.action.category = WLAN_ACTION_WNM;
 705         mgmt->u.action.u.bss_tm_query.action = WNM_BSS_TRANS_MGMT_QUERY;
 706         mgmt->u.action.u.bss_tm_query.dialog_token = 0;
 707         mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 708         pos = mgmt->u.action.u.bss_tm_query.variable;
 709
 710         len = pos - (u8 *) &mgmt->u.action.category;
 711
 712         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
 713                                   wpa_s->own_addr, wpa_s->bssid,
 714                                   &mgmt->u.action.category, len, 0);
 715
 716         return ret;
 717 }
 718
 719
 720 void ieee802_11_rx_wnm_action(struct wpa_supplicant *wpa_s,
 721                               struct rx_action *action)
 722 {
 723         const u8 *pos, *end;
 724         u8 act;
 725
 726         if (action->data == NULL || action->len == 0)
 727                 return;
 728
 729         pos = action->data;
 730         end = pos + action->len;
 731         act = *pos++;
 732
 733         wpa_printf(MSG_DEBUG, "WNM: RX action %u from " MACSTR,
 734                    act, MAC2STR(action->sa));
 735         if (wpa_s->wpa_state < WPA_ASSOCIATED ||
 736             os_memcmp(action->sa, wpa_s->bssid, ETH_ALEN) != 0) {
 737                 wpa_printf(MSG_DEBUG, "WNM: Ignore unexpected WNM Action "
 738                            "frame");
 739                 return;
 740         }
 741
 742         switch (act) {
 743         case WNM_BSS_TRANS_MGMT_REQ:
 744                 ieee802_11_rx_bss_trans_mgmt_req(wpa_s, pos, end,
 745                                                  !(action->da[0] & 0x01));
 746                 break;
 747         case WNM_SLEEP_MODE_RESP:
 748                 ieee802_11_rx_wnmsleep_resp(wpa_s, action->data, action->len);
 749                 break;
 750         default:
 751                 wpa_printf(MSG_ERROR, "WNM: Unknown request");
 752                 break;
 753         }
 754 }