drivers/net/wireless/marvell/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011-2014, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD       4
  32
  33 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  34 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  35                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  36                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  37
  38 /* Memory needed to store supported rate */
  39 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  40                                 + HOSTCMD_SUPPORTED_RATES)
  41
  42 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  43         scan */
  44 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  45         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  46                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  47                         + IEEE80211_MAX_SSID_LEN))
  48
  49 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  50 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  51                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  52                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  53                                 + CHAN_TLV_MAX_SIZE                 \
  54                                 + RATE_TLV_MAX_SIZE                 \
  55                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  56
  57
  58 union mwifiex_scan_cmd_config_tlv {
  59         /* Scan configuration (variable length) */
  60         struct mwifiex_scan_cmd_config config;
  61         /* Max allocated block */
  62         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  63 };
  64
  65 enum cipher_suite {
  66         CIPHER_SUITE_TKIP,
  67         CIPHER_SUITE_CCMP,
  68         CIPHER_SUITE_MAX
  69 };
  70 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  71         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  72         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  73 };
  74 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  75         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  76         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  77 };
  78
  79 static void
  80 _dbg_security_flags(int log_level, const char *func, const char *desc,
  81                     struct mwifiex_private *priv,
  82                     struct mwifiex_bssdescriptor *bss_desc)
  83 {
  84         _mwifiex_dbg(priv->adapter, log_level,
  85                      "info: %s: %s:\twpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s\tEncMode=%#x privacy=%#x\n",
  86                      func, desc,
  87                      bss_desc->bcn_wpa_ie ?
  88                      bss_desc->bcn_wpa_ie->vend_hdr.element_id : 0,
  89                      bss_desc->bcn_rsn_ie ?
  90                      bss_desc->bcn_rsn_ie->ieee_hdr.element_id : 0,
  91                      priv->sec_info.wep_enabled ? "e" : "d",
  92                      priv->sec_info.wpa_enabled ? "e" : "d",
  93                      priv->sec_info.wpa2_enabled ? "e" : "d",
  94                      priv->sec_info.encryption_mode,
  95                      bss_desc->privacy);
  96 }
  97 #define dbg_security_flags(mask, desc, priv, bss_desc) \
  98         _dbg_security_flags(MWIFIEX_DBG_##mask, desc, __func__, priv, bss_desc)
  99
 100 static bool
 101 has_ieee_hdr(struct ieee_types_generic *ie, u8 key)
 102 {
 103         return (ie && ie->ieee_hdr.element_id == key);
 104 }
 105
 106 static bool
 107 has_vendor_hdr(struct ieee_types_vendor_specific *ie, u8 key)
 108 {
 109         return (ie && ie->vend_hdr.element_id == key);
 110 }
 111
 112 /*
 113  * This function parses a given IE for a given OUI.
 114  *
 115  * This is used to parse a WPA/RSN IE to find if it has
 116  * a given oui in PTK.
 117  */
 118 static u8
 119 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
 120 {
 121         u8 count;
 122
 123         count = iebody->ptk_cnt[0];
 124
 125         /* There could be multiple OUIs for PTK hence
 126            1) Take the length.
 127            2) Check all the OUIs for AES.
 128            3) If one of them is AES then pass success. */
 129         while (count) {
 130                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
 131                         return MWIFIEX_OUI_PRESENT;
 132
 133                 --count;
 134                 if (count)
 135                         iebody = (struct ie_body *) ((u8 *) iebody +
 136                                                 sizeof(iebody->ptk_body));
 137         }
 138
 139         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 140         return MWIFIEX_OUI_NOT_PRESENT;
 141 }
 142
 143 /*
 144  * This function checks if a given OUI is present in a RSN IE.
 145  *
 146  * The function first checks if a RSN IE is present or not in the
 147  * BSS descriptor. It tries to locate the OUI only if such an IE is
 148  * present.
 149  */
 150 static u8
 151 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 152 {
 153         u8 *oui;
 154         struct ie_body *iebody;
 155         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 156
 157         if (has_ieee_hdr(bss_desc->bcn_rsn_ie, WLAN_EID_RSN)) {
 158                 iebody = (struct ie_body *)
 159                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 160                           RSN_GTK_OUI_OFFSET);
 161                 oui = &mwifiex_rsn_oui[cipher][0];
 162                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 163                 if (ret)
 164                         return ret;
 165         }
 166         return ret;
 167 }
 168
 169 /*
 170  * This function checks if a given OUI is present in a WPA IE.
 171  *
 172  * The function first checks if a WPA IE is present or not in the
 173  * BSS descriptor. It tries to locate the OUI only if such an IE is
 174  * present.
 175  */
 176 static u8
 177 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 178 {
 179         u8 *oui;
 180         struct ie_body *iebody;
 181         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 182
 183         if (has_vendor_hdr(bss_desc->bcn_wpa_ie, WLAN_EID_VENDOR_SPECIFIC)) {
 184                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 185                 oui = &mwifiex_wpa_oui[cipher][0];
 186                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 187                 if (ret)
 188                         return ret;
 189         }
 190         return ret;
 191 }
 192
 193 /*
 194  * This function compares two SSIDs and checks if they match.
 195  */
 196 s32
 197 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 198 {
 199         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 200                 return -1;
 201         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 202 }
 203
 204 /*
 205  * This function checks if wapi is enabled in driver and scanned network is
 206  * compatible with it.
 207  */
 208 static bool
 209 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 210                     struct mwifiex_bssdescriptor *bss_desc)
 211 {
 212         if (priv->sec_info.wapi_enabled &&
 213             has_ieee_hdr(bss_desc->bcn_wapi_ie, WLAN_EID_BSS_AC_ACCESS_DELAY))
 214                 return true;
 215         return false;
 216 }
 217
 218 /*
 219  * This function checks if driver is configured with no security mode and
 220  * scanned network is compatible with it.
 221  */
 222 static bool
 223 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 224                       struct mwifiex_bssdescriptor *bss_desc)
 225 {
 226         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 227             !priv->sec_info.wpa2_enabled &&
 228             !has_vendor_hdr(bss_desc->bcn_wpa_ie, WLAN_EID_VENDOR_SPECIFIC) &&
 229             !has_ieee_hdr(bss_desc->bcn_rsn_ie, WLAN_EID_RSN) &&
 230             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 231                 return true;
 232         }
 233         return false;
 234 }
 235
 236 /*
 237  * This function checks if static WEP is enabled in driver and scanned network
 238  * is compatible with it.
 239  */
 240 static bool
 241 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 242                           struct mwifiex_bssdescriptor *bss_desc)
 243 {
 244         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 245             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 246                 return true;
 247         }
 248         return false;
 249 }
 250
 251 /*
 252  * This function checks if wpa is enabled in driver and scanned network is
 253  * compatible with it.
 254  */
 255 static bool
 256 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 257                    struct mwifiex_bssdescriptor *bss_desc)
 258 {
 259         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 260             !priv->sec_info.wpa2_enabled &&
 261             has_vendor_hdr(bss_desc->bcn_wpa_ie, WLAN_EID_VENDOR_SPECIFIC)
 262            /*
 263             * Privacy bit may NOT be set in some APs like
 264             * LinkSys WRT54G && bss_desc->privacy
 265             */
 266          ) {
 267                 dbg_security_flags(INFO, "WPA", priv, bss_desc);
 268                 return true;
 269         }
 270         return false;
 271 }
 272
 273 /*
 274  * This function checks if wpa2 is enabled in driver and scanned network is
 275  * compatible with it.
 276  */
 277 static bool
 278 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 279                     struct mwifiex_bssdescriptor *bss_desc)
 280 {
 281         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 282             priv->sec_info.wpa2_enabled &&
 283             has_ieee_hdr(bss_desc->bcn_rsn_ie, WLAN_EID_RSN)) {
 284                 /*
 285                  * Privacy bit may NOT be set in some APs like
 286                  * LinkSys WRT54G && bss_desc->privacy
 287                  */
 288                 dbg_security_flags(INFO, "WAP2", priv, bss_desc);
 289                 return true;
 290         }
 291         return false;
 292 }
 293
 294 /*
 295  * This function checks if adhoc AES is enabled in driver and scanned network is
 296  * compatible with it.
 297  */
 298 static bool
 299 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 300                          struct mwifiex_bssdescriptor *bss_desc)
 301 {
 302         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 303             !priv->sec_info.wpa2_enabled &&
 304             !has_vendor_hdr(bss_desc->bcn_wpa_ie, WLAN_EID_VENDOR_SPECIFIC) &&
 305             !has_ieee_hdr(bss_desc->bcn_rsn_ie, WLAN_EID_RSN) &&
 306             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 307                 return true;
 308         }
 309         return false;
 310 }
 311
 312 /*
 313  * This function checks if dynamic WEP is enabled in driver and scanned network
 314  * is compatible with it.
 315  */
 316 static bool
 317 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 318                            struct mwifiex_bssdescriptor *bss_desc)
 319 {
 320         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 321             !priv->sec_info.wpa2_enabled &&
 322             !has_vendor_hdr(bss_desc->bcn_wpa_ie, WLAN_EID_VENDOR_SPECIFIC) &&
 323             !has_ieee_hdr(bss_desc->bcn_rsn_ie, WLAN_EID_RSN) &&
 324             priv->sec_info.encryption_mode && bss_desc->privacy) {
 325                 dbg_security_flags(INFO, "dynamic", priv, bss_desc);
 326                 return true;
 327         }
 328         return false;
 329 }
 330
 331 /*
 332  * This function checks if a scanned network is compatible with the driver
 333  * settings.
 334  *
 335  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 336  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 337  *    0       0       0      0     NONE      0     0   0   yes No security
 338  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 339  *                                                         HT if no AES)
 340  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 341  *                                                         HT if no AES)
 342  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 343  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 344  *                                                         (disable HT)
 345  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 346  *
 347  * Compatibility is not matched while roaming, except for mode.
 348  */
 349 static s32
 350 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 351                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 352 {
 353         struct mwifiex_adapter *adapter = priv->adapter;
 354
 355         bss_desc->disable_11n = false;
 356
 357         /* Don't check for compatibility if roaming */
 358         if (priv->media_connected &&
 359             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 360             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 361                 return 0;
 362
 363         if (priv->wps.session_enable) {
 364                 mwifiex_dbg(adapter, IOCTL,
 365                             "info: return success directly in WPS period\n");
 366                 return 0;
 367         }
 368
 369         if (bss_desc->chan_sw_ie_present) {
 370                 mwifiex_dbg(adapter, INFO,
 371                             "Don't connect to AP with WLAN_EID_CHANNEL_SWITCH\n");
 372                 return -1;
 373         }
 374
 375         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 376                 mwifiex_dbg(adapter, INFO,
 377                             "info: return success for WAPI AP\n");
 378                 return 0;
 379         }
 380
 381         if (bss_desc->bss_mode == mode) {
 382                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 383                         /* No security */
 384                         return 0;
 385                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 386                         /* Static WEP enabled */
 387                         mwifiex_dbg(adapter, INFO,
 388                                     "info: Disable 11n in WEP mode.\n");
 389                         bss_desc->disable_11n = true;
 390                         return 0;
 391                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 392                         /* WPA enabled */
 393                         if (((priv->adapter->config_bands & BAND_GN ||
 394                               priv->adapter->config_bands & BAND_AN) &&
 395                              bss_desc->bcn_ht_cap) &&
 396                             !mwifiex_is_wpa_oui_present(bss_desc,
 397                                                          CIPHER_SUITE_CCMP)) {
 398
 399                                 if (mwifiex_is_wpa_oui_present
 400                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 401                                         mwifiex_dbg(adapter, INFO,
 402                                                     "info: Disable 11n if AES\t"
 403                                                     "is not supported by AP\n");
 404                                         bss_desc->disable_11n = true;
 405                                 } else {
 406                                         return -1;
 407                                 }
 408                         }
 409                         return 0;
 410                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 411                         /* WPA2 enabled */
 412                         if (((priv->adapter->config_bands & BAND_GN ||
 413                               priv->adapter->config_bands & BAND_AN) &&
 414                              bss_desc->bcn_ht_cap) &&
 415                             !mwifiex_is_rsn_oui_present(bss_desc,
 416                                                         CIPHER_SUITE_CCMP)) {
 417
 418                                 if (mwifiex_is_rsn_oui_present
 419                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 420                                         mwifiex_dbg(adapter, INFO,
 421                                                     "info: Disable 11n if AES\t"
 422                                                     "is not supported by AP\n");
 423                                         bss_desc->disable_11n = true;
 424                                 } else {
 425                                         return -1;
 426                                 }
 427                         }
 428                         return 0;
 429                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 430                         /* Ad-hoc AES enabled */
 431                         return 0;
 432                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 433                         /* Dynamic WEP enabled */
 434                         return 0;
 435                 }
 436
 437                 /* Security doesn't match */
 438                 dbg_security_flags(ERROR, "failed", priv, bss_desc);
 439                 return -1;
 440         }
 441
 442         /* Mode doesn't match */
 443         return -1;
 444 }
 445
 446 /*
 447  * This function creates a channel list for the driver to scan, based
 448  * on region/band information.
 449  *
 450  * This routine is used for any scan that is not provided with a
 451  * specific channel list to scan.
 452  */
 453 static int
 454 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 455                                  const struct mwifiex_user_scan_cfg
 456                                                         *user_scan_in,
 457                                  struct mwifiex_chan_scan_param_set
 458                                                         *scan_chan_list,
 459                                  u8 filtered_scan)
 460 {
 461         enum nl80211_band band;
 462         struct ieee80211_supported_band *sband;
 463         struct ieee80211_channel *ch;
 464         struct mwifiex_adapter *adapter = priv->adapter;
 465         int chan_idx = 0, i;
 466
 467         for (band = 0; (band < NUM_NL80211_BANDS) ; band++) {
 468
 469                 if (!priv->wdev.wiphy->bands[band])
 470                         continue;
 471
 472                 sband = priv->wdev.wiphy->bands[band];
 473
 474                 for (i = 0; (i < sband->n_channels) ; i++) {
 475                         ch = &sband->channels[i];
 476                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 477                                 continue;
 478                         scan_chan_list[chan_idx].radio_type = band;
 479
 480                         if (user_scan_in &&
 481                             user_scan_in->chan_list[0].scan_time)
 482                                 scan_chan_list[chan_idx].max_scan_time =
 483                                         cpu_to_le16((u16) user_scan_in->
 484                                         chan_list[0].scan_time);
 485                         else if ((ch->flags & IEEE80211_CHAN_NO_IR) ||
 486                                  (ch->flags & IEEE80211_CHAN_RADAR))
 487                                 scan_chan_list[chan_idx].max_scan_time =
 488                                         cpu_to_le16(adapter->passive_scan_time);
 489                         else
 490                                 scan_chan_list[chan_idx].max_scan_time =
 491                                         cpu_to_le16(adapter->active_scan_time);
 492
 493                         if (ch->flags & IEEE80211_CHAN_NO_IR)
 494                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 495                                         |= (MWIFIEX_PASSIVE_SCAN |
 496                                             MWIFIEX_HIDDEN_SSID_REPORT);
 497                         else
 498                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 499                                         &= ~MWIFIEX_PASSIVE_SCAN;
 500                         scan_chan_list[chan_idx].chan_number =
 501                                                         (u32) ch->hw_value;
 502
 503                         scan_chan_list[chan_idx].chan_scan_mode_bitmap
 504                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 505
 506                         if (filtered_scan &&
 507                             !((ch->flags & IEEE80211_CHAN_NO_IR) ||
 508                               (ch->flags & IEEE80211_CHAN_RADAR)))
 509                                 scan_chan_list[chan_idx].max_scan_time =
 510                                 cpu_to_le16(adapter->specific_scan_time);
 511
 512                         chan_idx++;
 513                 }
 514
 515         }
 516         return chan_idx;
 517 }
 518
 519 /* This function creates a channel list tlv for bgscan config, based
 520  * on region/band information.
 521  */
 522 static int
 523 mwifiex_bgscan_create_channel_list(struct mwifiex_private *priv,
 524                                    const struct mwifiex_bg_scan_cfg
 525                                                 *bgscan_cfg_in,
 526                                    struct mwifiex_chan_scan_param_set
 527                                                 *scan_chan_list)
 528 {
 529         enum nl80211_band band;
 530         struct ieee80211_supported_band *sband;
 531         struct ieee80211_channel *ch;
 532         struct mwifiex_adapter *adapter = priv->adapter;
 533         int chan_idx = 0, i;
 534
 535         for (band = 0; (band < NUM_NL80211_BANDS); band++) {
 536                 if (!priv->wdev.wiphy->bands[band])
 537                         continue;
 538
 539                 sband = priv->wdev.wiphy->bands[band];
 540
 541                 for (i = 0; (i < sband->n_channels) ; i++) {
 542                         ch = &sband->channels[i];
 543                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 544                                 continue;
 545                         scan_chan_list[chan_idx].radio_type = band;
 546
 547                         if (bgscan_cfg_in->chan_list[0].scan_time)
 548                                 scan_chan_list[chan_idx].max_scan_time =
 549                                         cpu_to_le16((u16)bgscan_cfg_in->
 550                                         chan_list[0].scan_time);
 551                         else if (ch->flags & IEEE80211_CHAN_NO_IR)
 552                                 scan_chan_list[chan_idx].max_scan_time =
 553                                         cpu_to_le16(adapter->passive_scan_time);
 554                         else
 555                                 scan_chan_list[chan_idx].max_scan_time =
 556                                         cpu_to_le16(adapter->
 557                                                     specific_scan_time);
 558
 559                         if (ch->flags & IEEE80211_CHAN_NO_IR)
 560                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 561                                         |= MWIFIEX_PASSIVE_SCAN;
 562                         else
 563                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 564                                         &= ~MWIFIEX_PASSIVE_SCAN;
 565
 566                         scan_chan_list[chan_idx].chan_number =
 567                                                         (u32)ch->hw_value;
 568                         chan_idx++;
 569                 }
 570         }
 571         return chan_idx;
 572 }
 573
 574 /* This function appends rate TLV to scan config command. */
 575 static int
 576 mwifiex_append_rate_tlv(struct mwifiex_private *priv,
 577                         struct mwifiex_scan_cmd_config *scan_cfg_out,
 578                         u8 radio)
 579 {
 580         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 581         u8 rates[MWIFIEX_SUPPORTED_RATES], *tlv_pos;
 582         u32 rates_size;
 583
 584         memset(rates, 0, sizeof(rates));
 585
 586         tlv_pos = (u8 *)scan_cfg_out->tlv_buf + scan_cfg_out->tlv_buf_len;
 587
 588         if (priv->scan_request)
 589                 rates_size = mwifiex_get_rates_from_cfg80211(priv, rates,
 590                                                              radio);
 591         else
 592                 rates_size = mwifiex_get_supported_rates(priv, rates);
 593
 594         mwifiex_dbg(priv->adapter, CMD,
 595                     "info: SCAN_CMD: Rates size = %d\n",
 596                 rates_size);
 597         rates_tlv = (struct mwifiex_ie_types_rates_param_set *)tlv_pos;
 598         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 599         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 600         memcpy(rates_tlv->rates, rates, rates_size);
 601         scan_cfg_out->tlv_buf_len += sizeof(rates_tlv->header) + rates_size;
 602
 603         return rates_size;
 604 }
 605
 606 /*
 607  * This function constructs and sends multiple scan config commands to
 608  * the firmware.
 609  *
 610  * Previous routines in the code flow have created a scan command configuration
 611  * with any requested TLVs.  This function splits the channel TLV into maximum
 612  * channels supported per scan lists and sends the portion of the channel TLV,
 613  * along with the other TLVs, to the firmware.
 614  */
 615 static int
 616 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 617                           u32 max_chan_per_scan, u8 filtered_scan,
 618                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 619                           struct mwifiex_ie_types_chan_list_param_set
 620                           *chan_tlv_out,
 621                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 622 {
 623         struct mwifiex_adapter *adapter = priv->adapter;
 624         int ret = 0;
 625         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 626         struct mwifiex_chan_scan_param_set *start_chan;
 627         u32 tlv_idx, rates_size, cmd_no;
 628         u32 total_scan_time;
 629         u32 done_early;
 630         u8 radio_type;
 631
 632         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 633                 mwifiex_dbg(priv->adapter, ERROR,
 634                             "info: Scan: Null detect: %p, %p, %p\n",
 635                             scan_cfg_out, chan_tlv_out, scan_chan_list);
 636                 return -1;
 637         }
 638
 639         /* Check csa channel expiry before preparing scan list */
 640         mwifiex_11h_get_csa_closed_channel(priv);
 641
 642         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 643
 644         /* Set the temp channel struct pointer to the start of the desired
 645            list */
 646         tmp_chan_list = scan_chan_list;
 647
 648         /* Loop through the desired channel list, sending a new firmware scan
 649            commands for each max_chan_per_scan channels (or for 1,6,11
 650            individually if configured accordingly) */
 651         while (tmp_chan_list->chan_number) {
 652
 653                 tlv_idx = 0;
 654                 total_scan_time = 0;
 655                 radio_type = 0;
 656                 chan_tlv_out->header.len = 0;
 657                 start_chan = tmp_chan_list;
 658                 done_early = false;
 659
 660                 /*
 661                  * Construct the Channel TLV for the scan command.  Continue to
 662                  * insert channel TLVs until:
 663                  *   - the tlv_idx hits the maximum configured per scan command
 664                  *   - the next channel to insert is 0 (end of desired channel
 665                  *     list)
 666                  *   - done_early is set (controlling individual scanning of
 667                  *     1,6,11)
 668                  */
 669                 while (tlv_idx < max_chan_per_scan &&
 670                        tmp_chan_list->chan_number && !done_early) {
 671
 672                         if (tmp_chan_list->chan_number == priv->csa_chan) {
 673                                 tmp_chan_list++;
 674                                 continue;
 675                         }
 676
 677                         radio_type = tmp_chan_list->radio_type;
 678                         mwifiex_dbg(priv->adapter, INFO,
 679                                     "info: Scan: Chan(%3d), Radio(%d),\t"
 680                                     "Mode(%d, %d), Dur(%d)\n",
 681                                     tmp_chan_list->chan_number,
 682                                     tmp_chan_list->radio_type,
 683                                     tmp_chan_list->chan_scan_mode_bitmap
 684                                     & MWIFIEX_PASSIVE_SCAN,
 685                                     (tmp_chan_list->chan_scan_mode_bitmap
 686                                     & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 687                                     le16_to_cpu(tmp_chan_list->max_scan_time));
 688
 689                         /* Copy the current channel TLV to the command being
 690                            prepared */
 691                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 692                                tmp_chan_list,
 693                                sizeof(chan_tlv_out->chan_scan_param));
 694
 695                         /* Increment the TLV header length by the size
 696                            appended */
 697                         le16_unaligned_add_cpu(&chan_tlv_out->header.len,
 698                                                sizeof(
 699                                                 chan_tlv_out->chan_scan_param));
 700
 701                         /*
 702                          * The tlv buffer length is set to the number of bytes
 703                          * of the between the channel tlv pointer and the start
 704                          * of the tlv buffer.  This compensates for any TLVs
 705                          * that were appended before the channel list.
 706                          */
 707                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 708                                                         scan_cfg_out->tlv_buf);
 709
 710                         /* Add the size of the channel tlv header and the data
 711                            length */
 712                         scan_cfg_out->tlv_buf_len +=
 713                                 (sizeof(chan_tlv_out->header)
 714                                  + le16_to_cpu(chan_tlv_out->header.len));
 715
 716                         /* Increment the index to the channel tlv we are
 717                            constructing */
 718                         tlv_idx++;
 719
 720                         /* Count the total scan time per command */
 721                         total_scan_time +=
 722                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 723
 724                         done_early = false;
 725
 726                         /* Stop the loop if the *current* channel is in the
 727                            1,6,11 set and we are not filtering on a BSSID
 728                            or SSID. */
 729                         if (!filtered_scan &&
 730                             (tmp_chan_list->chan_number == 1 ||
 731                              tmp_chan_list->chan_number == 6 ||
 732                              tmp_chan_list->chan_number == 11))
 733                                 done_early = true;
 734
 735                         /* Increment the tmp pointer to the next channel to
 736                            be scanned */
 737                         tmp_chan_list++;
 738
 739                         /* Stop the loop if the *next* channel is in the 1,6,11
 740                            set.  This will cause it to be the only channel
 741                            scanned on the next interation */
 742                         if (!filtered_scan &&
 743                             (tmp_chan_list->chan_number == 1 ||
 744                              tmp_chan_list->chan_number == 6 ||
 745                              tmp_chan_list->chan_number == 11))
 746                                 done_early = true;
 747                 }
 748
 749                 /* The total scan time should be less than scan command timeout
 750                    value */
 751                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 752                         mwifiex_dbg(priv->adapter, ERROR,
 753                                     "total scan time %dms\t"
 754                                     "is over limit (%dms), scan skipped\n",
 755                                     total_scan_time,
 756                                     MWIFIEX_MAX_TOTAL_SCAN_TIME);
 757                         ret = -1;
 758                         break;
 759                 }
 760
 761                 rates_size = mwifiex_append_rate_tlv(priv, scan_cfg_out,
 762                                                      radio_type);
 763
 764                 priv->adapter->scan_channels = start_chan;
 765
 766                 /* Send the scan command to the firmware with the specified
 767                    cfg */
 768                 if (priv->adapter->ext_scan)
 769                         cmd_no = HostCmd_CMD_802_11_SCAN_EXT;
 770                 else
 771                         cmd_no = HostCmd_CMD_802_11_SCAN;
 772
 773                 ret = mwifiex_send_cmd(priv, cmd_no, HostCmd_ACT_GEN_SET,
 774                                        0, scan_cfg_out, false);
 775
 776                 /* rate IE is updated per scan command but same starting
 777                  * pointer is used each time so that rate IE from earlier
 778                  * scan_cfg_out->buf is overwritten with new one.
 779                  */
 780                 scan_cfg_out->tlv_buf_len -=
 781                             sizeof(struct mwifiex_ie_types_header) + rates_size;
 782
 783                 if (ret) {
 784                         mwifiex_cancel_pending_scan_cmd(adapter);
 785                         break;
 786                 }
 787         }
 788
 789         if (ret)
 790                 return -1;
 791
 792         return 0;
 793 }
 794
 795 /*
 796  * This function constructs a scan command configuration structure to use
 797  * in scan commands.
 798  *
 799  * Application layer or other functions can invoke network scanning
 800  * with a scan configuration supplied in a user scan configuration structure.
 801  * This structure is used as the basis of one or many scan command configuration
 802  * commands that are sent to the command processing module and eventually to the
 803  * firmware.
 804  *
 805  * This function creates a scan command configuration structure  based on the
 806  * following user supplied parameters (if present):
 807  *      - SSID filter
 808  *      - BSSID filter
 809  *      - Number of Probes to be sent
 810  *      - Channel list
 811  *
 812  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 813  * If the number of probes is not set, adapter default setting is used.
 814  */
 815 static void
 816 mwifiex_config_scan(struct mwifiex_private *priv,
 817                     const struct mwifiex_user_scan_cfg *user_scan_in,
 818                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 819                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 820                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 821                     u8 *max_chan_per_scan, u8 *filtered_scan,
 822                     u8 *scan_current_only)
 823 {
 824         struct mwifiex_adapter *adapter = priv->adapter;
 825         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 826         struct mwifiex_ie_types_scan_chan_gap *chan_gap_tlv;
 827         struct mwifiex_ie_types_random_mac *random_mac_tlv;
 828         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 829         struct mwifiex_ie_types_bssid_list *bssid_tlv;
 830         u8 *tlv_pos;
 831         u32 num_probes;
 832         u32 ssid_len;
 833         u32 chan_idx;
 834         u32 scan_type;
 835         u16 scan_dur;
 836         u8 channel;
 837         u8 radio_type;
 838         int i;
 839         u8 ssid_filter;
 840         struct mwifiex_ie_types_htcap *ht_cap;
 841         struct mwifiex_ie_types_bss_mode *bss_mode;
 842         const u8 zero_mac[6] = {0, 0, 0, 0, 0, 0};
 843
 844         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 845            in this routine will be preserved since the routine that sends the
 846            command will append channelTLVs at *chan_list_out.  The difference
 847            between the *chan_list_out and the tlv_buf start will be used to
 848            calculate the size of anything we add in this routine. */
 849         scan_cfg_out->tlv_buf_len = 0;
 850
 851         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 852            so later routines know where channels can be added to the command
 853            buf */
 854         tlv_pos = scan_cfg_out->tlv_buf;
 855
 856         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 857            below if a SSID or BSSID filter is sent in the command */
 858         *filtered_scan = false;
 859
 860         /* Initialize the scan as not being only on the current channel.  If
 861            the channel list is customized, only contains one channel, and is
 862            the active channel, this is set true and data flow is not halted. */
 863         *scan_current_only = false;
 864
 865         if (user_scan_in) {
 866                 u8 tmpaddr[ETH_ALEN];
 867
 868                 /* Default the ssid_filter flag to TRUE, set false under
 869                    certain wildcard conditions and qualified by the existence
 870                    of an SSID list before marking the scan as filtered */
 871                 ssid_filter = true;
 872
 873                 /* Set the BSS type scan filter, use Adapter setting if
 874                    unset */
 875                 scan_cfg_out->bss_mode =
 876                         (u8)(user_scan_in->bss_mode ?: adapter->scan_mode);
 877
 878                 /* Set the number of probes to send, use Adapter setting
 879                    if unset */
 880                 num_probes = user_scan_in->num_probes ?: adapter->scan_probes;
 881
 882                 /*
 883                  * Set the BSSID filter to the incoming configuration,
 884                  * if non-zero.  If not set, it will remain disabled
 885                  * (all zeros).
 886                  */
 887                 memcpy(scan_cfg_out->specific_bssid,
 888                        user_scan_in->specific_bssid,
 889                        sizeof(scan_cfg_out->specific_bssid));
 890
 891                 memcpy(tmpaddr, scan_cfg_out->specific_bssid, ETH_ALEN);
 892
 893                 if (adapter->ext_scan &&
 894                     !is_zero_ether_addr(tmpaddr)) {
 895                         bssid_tlv =
 896                                 (struct mwifiex_ie_types_bssid_list *)tlv_pos;
 897                         bssid_tlv->header.type = cpu_to_le16(TLV_TYPE_BSSID);
 898                         bssid_tlv->header.len = cpu_to_le16(ETH_ALEN);
 899                         memcpy(bssid_tlv->bssid, user_scan_in->specific_bssid,
 900                                ETH_ALEN);
 901                         tlv_pos += sizeof(struct mwifiex_ie_types_bssid_list);
 902                 }
 903
 904                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 905                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 906
 907                         wildcard_ssid_tlv =
 908                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 909                                 tlv_pos;
 910                         wildcard_ssid_tlv->header.type =
 911                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 912                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 913                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 914                                                          max_ssid_length)));
 915
 916                         /*
 917                          * max_ssid_length = 0 tells firmware to perform
 918                          * specific scan for the SSID filled, whereas
 919                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 920                          * wildcard scan.
 921                          */
 922                         if (ssid_len)
 923                                 wildcard_ssid_tlv->max_ssid_length = 0;
 924                         else
 925                                 wildcard_ssid_tlv->max_ssid_length =
 926                                                         IEEE80211_MAX_SSID_LEN;
 927
 928                         if (!memcmp(user_scan_in->ssid_list[i].ssid,
 929                                     "DIRECT-", 7))
 930                                 wildcard_ssid_tlv->max_ssid_length = 0xfe;
 931
 932                         memcpy(wildcard_ssid_tlv->ssid,
 933                                user_scan_in->ssid_list[i].ssid, ssid_len);
 934
 935                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 936                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 937
 938                         mwifiex_dbg(adapter, INFO,
 939                                     "info: scan: ssid[%d]: %s, %d\n",
 940                                     i, wildcard_ssid_tlv->ssid,
 941                                     wildcard_ssid_tlv->max_ssid_length);
 942
 943                         /* Empty wildcard ssid with a maxlen will match many or
 944                            potentially all SSIDs (maxlen == 32), therefore do
 945                            not treat the scan as
 946                            filtered. */
 947                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 948                                 ssid_filter = false;
 949                 }
 950
 951                 /*
 952                  *  The default number of channels sent in the command is low to
 953                  *  ensure the response buffer from the firmware does not
 954                  *  truncate scan results.  That is not an issue with an SSID
 955                  *  or BSSID filter applied to the scan results in the firmware.
 956                  */
 957                 memcpy(tmpaddr, scan_cfg_out->specific_bssid, ETH_ALEN);
 958                 if ((i && ssid_filter) ||
 959                     !is_zero_ether_addr(tmpaddr))
 960                         *filtered_scan = true;
 961
 962                 if (user_scan_in->scan_chan_gap) {
 963                         mwifiex_dbg(adapter, INFO,
 964                                     "info: scan: channel gap = %d\n",
 965                                     user_scan_in->scan_chan_gap);
 966                         *max_chan_per_scan =
 967                                         MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 968
 969                         chan_gap_tlv = (void *)tlv_pos;
 970                         chan_gap_tlv->header.type =
 971                                          cpu_to_le16(TLV_TYPE_SCAN_CHANNEL_GAP);
 972                         chan_gap_tlv->header.len =
 973                                     cpu_to_le16(sizeof(chan_gap_tlv->chan_gap));
 974                         chan_gap_tlv->chan_gap =
 975                                      cpu_to_le16((user_scan_in->scan_chan_gap));
 976                         tlv_pos +=
 977                                   sizeof(struct mwifiex_ie_types_scan_chan_gap);
 978                 }
 979
 980                 if (!ether_addr_equal(user_scan_in->random_mac, zero_mac)) {
 981                         random_mac_tlv = (void *)tlv_pos;
 982                         random_mac_tlv->header.type =
 983                                          cpu_to_le16(TLV_TYPE_RANDOM_MAC);
 984                         random_mac_tlv->header.len =
 985                                     cpu_to_le16(sizeof(random_mac_tlv->mac));
 986                         ether_addr_copy(random_mac_tlv->mac,
 987                                         user_scan_in->random_mac);
 988                         tlv_pos +=
 989                                   sizeof(struct mwifiex_ie_types_random_mac);
 990                 }
 991         } else {
 992                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 993                 num_probes = adapter->scan_probes;
 994         }
 995
 996         /*
 997          *  If a specific BSSID or SSID is used, the number of channels in the
 998          *  scan command will be increased to the absolute maximum.
 999          */
1000         if (*filtered_scan) {
1001                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
1002         } else {
1003                 if (!priv->media_connected)
1004                         *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
1005                 else
1006                         *max_chan_per_scan =
1007                                         MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD / 2;
1008         }
1009
1010         if (adapter->ext_scan) {
1011                 bss_mode = (struct mwifiex_ie_types_bss_mode *)tlv_pos;
1012                 bss_mode->header.type = cpu_to_le16(TLV_TYPE_BSS_MODE);
1013                 bss_mode->header.len = cpu_to_le16(sizeof(bss_mode->bss_mode));
1014                 bss_mode->bss_mode = scan_cfg_out->bss_mode;
1015                 tlv_pos += sizeof(bss_mode->header) +
1016                            le16_to_cpu(bss_mode->header.len);
1017         }
1018
1019         /* If the input config or adapter has the number of Probes set,
1020            add tlv */
1021         if (num_probes) {
1022
1023                 mwifiex_dbg(adapter, INFO,
1024                             "info: scan: num_probes = %d\n",
1025                             num_probes);
1026
1027                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
1028                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
1029                 num_probes_tlv->header.len =
1030                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
1031                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
1032
1033                 tlv_pos += sizeof(num_probes_tlv->header) +
1034                         le16_to_cpu(num_probes_tlv->header.len);
1035
1036         }
1037
1038         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
1039             (priv->adapter->config_bands & BAND_GN ||
1040              priv->adapter->config_bands & BAND_AN)) {
1041                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
1042                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
1043                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
1044                 ht_cap->header.len =
1045                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
1046                 radio_type =
1047                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
1048                 mwifiex_fill_cap_info(priv, radio_type, &ht_cap->ht_cap);
1049                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
1050         }
1051
1052         /* Append vendor specific IE TLV */
1053         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
1054
1055         /*
1056          * Set the output for the channel TLV to the address in the tlv buffer
1057          *   past any TLVs that were added in this function (SSID, num_probes).
1058          *   Channel TLVs will be added past this for each scan command,
1059          *   preserving the TLVs that were previously added.
1060          */
1061         *chan_list_out =
1062                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
1063
1064         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
1065
1066                 mwifiex_dbg(adapter, INFO,
1067                             "info: Scan: Using supplied channel list\n");
1068
1069                 for (chan_idx = 0;
1070                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
1071                      user_scan_in->chan_list[chan_idx].chan_number;
1072                      chan_idx++) {
1073
1074                         channel = user_scan_in->chan_list[chan_idx].chan_number;
1075                         scan_chan_list[chan_idx].chan_number = channel;
1076
1077                         radio_type =
1078                                 user_scan_in->chan_list[chan_idx].radio_type;
1079                         scan_chan_list[chan_idx].radio_type = radio_type;
1080
1081                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
1082
1083                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
1084                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
1085                                         |= (MWIFIEX_PASSIVE_SCAN |
1086                                             MWIFIEX_HIDDEN_SSID_REPORT);
1087                         else
1088                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
1089                                         &= ~MWIFIEX_PASSIVE_SCAN;
1090
1091                         scan_chan_list[chan_idx].chan_scan_mode_bitmap
1092                                 |= MWIFIEX_DISABLE_CHAN_FILT;
1093
1094                         if (user_scan_in->chan_list[chan_idx].scan_time) {
1095                                 scan_dur = (u16) user_scan_in->
1096                                         chan_list[chan_idx].scan_time;
1097                         } else {
1098                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
1099                                         scan_dur = adapter->passive_scan_time;
1100                                 else if (*filtered_scan)
1101                                         scan_dur = adapter->specific_scan_time;
1102                                 else
1103                                         scan_dur = adapter->active_scan_time;
1104                         }
1105
1106                         scan_chan_list[chan_idx].min_scan_time =
1107                                 cpu_to_le16(scan_dur);
1108                         scan_chan_list[chan_idx].max_scan_time =
1109                                 cpu_to_le16(scan_dur);
1110                 }
1111
1112                 /* Check if we are only scanning the current channel */
1113                 if ((chan_idx == 1) &&
1114                     (user_scan_in->chan_list[0].chan_number ==
1115                      priv->curr_bss_params.bss_descriptor.channel)) {
1116                         *scan_current_only = true;
1117                         mwifiex_dbg(adapter, INFO,
1118                                     "info: Scan: Scanning current channel only\n");
1119                 }
1120         } else {
1121                 mwifiex_dbg(adapter, INFO,
1122                             "info: Scan: Creating full region channel list\n");
1123                 mwifiex_scan_create_channel_list(priv, user_scan_in,
1124                                                  scan_chan_list,
1125                                                  *filtered_scan);
1126         }
1127
1128 }
1129
1130 /*
1131  * This function inspects the scan response buffer for pointers to
1132  * expected TLVs.
1133  *
1134  * TLVs can be included at the end of the scan response BSS information.
1135  *
1136  * Data in the buffer is parsed pointers to TLVs that can potentially
1137  * be passed back in the response.
1138  */
1139 static void
1140 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1141                                      struct mwifiex_ie_types_data *tlv,
1142                                      u32 tlv_buf_size, u32 req_tlv_type,
1143                                      struct mwifiex_ie_types_data **tlv_data)
1144 {
1145         struct mwifiex_ie_types_data *current_tlv;
1146         u32 tlv_buf_left;
1147         u32 tlv_type;
1148         u32 tlv_len;
1149
1150         current_tlv = tlv;
1151         tlv_buf_left = tlv_buf_size;
1152         *tlv_data = NULL;
1153
1154         mwifiex_dbg(adapter, INFO,
1155                     "info: SCAN_RESP: tlv_buf_size = %d\n",
1156                     tlv_buf_size);
1157
1158         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1159
1160                 tlv_type = le16_to_cpu(current_tlv->header.type);
1161                 tlv_len = le16_to_cpu(current_tlv->header.len);
1162
1163                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1164                         mwifiex_dbg(adapter, ERROR,
1165                                     "SCAN_RESP: TLV buffer corrupt\n");
1166                         break;
1167                 }
1168
1169                 if (req_tlv_type == tlv_type) {
1170                         switch (tlv_type) {
1171                         case TLV_TYPE_TSFTIMESTAMP:
1172                                 mwifiex_dbg(adapter, INFO,
1173                                             "info: SCAN_RESP: TSF\t"
1174                                             "timestamp TLV, len = %d\n",
1175                                             tlv_len);
1176                                 *tlv_data = current_tlv;
1177                                 break;
1178                         case TLV_TYPE_CHANNELBANDLIST:
1179                                 mwifiex_dbg(adapter, INFO,
1180                                             "info: SCAN_RESP: channel\t"
1181                                             "band list TLV, len = %d\n",
1182                                             tlv_len);
1183                                 *tlv_data = current_tlv;
1184                                 break;
1185                         default:
1186                                 mwifiex_dbg(adapter, ERROR,
1187                                             "SCAN_RESP: unhandled TLV = %d\n",
1188                                             tlv_type);
1189                                 /* Give up, this seems corrupted */
1190                                 return;
1191                         }
1192                 }
1193
1194                 if (*tlv_data)
1195                         break;
1196
1197
1198                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1199                 current_tlv =
1200                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1201                                                           tlv_len);
1202
1203         }                       /* while */
1204 }
1205
1206 /*
1207  * This function parses provided beacon buffer and updates
1208  * respective fields in bss descriptor structure.
1209  */
1210 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1211                                     struct mwifiex_bssdescriptor *bss_entry)
1212 {
1213         int ret = 0;
1214         u8 element_id;
1215         struct ieee_types_fh_param_set *fh_param_set;
1216         struct ieee_types_ds_param_set *ds_param_set;
1217         struct ieee_types_cf_param_set *cf_param_set;
1218         struct ieee_types_ibss_param_set *ibss_param_set;
1219         u8 *current_ptr;
1220         u8 *rate;
1221         u8 element_len;
1222         u16 total_ie_len;
1223         u8 bytes_to_copy;
1224         u8 rate_size;
1225         u8 found_data_rate_ie;
1226         u32 bytes_left;
1227         struct ieee_types_vendor_specific *vendor_ie;
1228         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1229         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1230
1231         found_data_rate_ie = false;
1232         rate_size = 0;
1233         current_ptr = bss_entry->beacon_buf;
1234         bytes_left = bss_entry->beacon_buf_size;
1235
1236         /* Process variable IE */
1237         while (bytes_left >= 2) {
1238                 element_id = *current_ptr;
1239                 element_len = *(current_ptr + 1);
1240                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1241
1242                 if (bytes_left < total_ie_len) {
1243                         mwifiex_dbg(adapter, ERROR,
1244                                     "err: InterpretIE: in processing\t"
1245                                     "IE, bytes left < IE length\n");
1246                         return -1;
1247                 }
1248                 switch (element_id) {
1249                 case WLAN_EID_SSID:
1250                         bss_entry->ssid.ssid_len = element_len;
1251                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1252                                element_len);
1253                         mwifiex_dbg(adapter, INFO,
1254                                     "info: InterpretIE: ssid: %-32s\n",
1255                                     bss_entry->ssid.ssid);
1256                         break;
1257
1258                 case WLAN_EID_SUPP_RATES:
1259                         memcpy(bss_entry->data_rates, current_ptr + 2,
1260                                element_len);
1261                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1262                                element_len);
1263                         rate_size = element_len;
1264                         found_data_rate_ie = true;
1265                         break;
1266
1267                 case WLAN_EID_FH_PARAMS:
1268                         fh_param_set =
1269                                 (struct ieee_types_fh_param_set *) current_ptr;
1270                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1271                                fh_param_set,
1272                                sizeof(struct ieee_types_fh_param_set));
1273                         break;
1274
1275                 case WLAN_EID_DS_PARAMS:
1276                         ds_param_set =
1277                                 (struct ieee_types_ds_param_set *) current_ptr;
1278
1279                         bss_entry->channel = ds_param_set->current_chan;
1280
1281                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1282                                ds_param_set,
1283                                sizeof(struct ieee_types_ds_param_set));
1284                         break;
1285
1286                 case WLAN_EID_CF_PARAMS:
1287                         cf_param_set =
1288                                 (struct ieee_types_cf_param_set *) current_ptr;
1289                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1290                                cf_param_set,
1291                                sizeof(struct ieee_types_cf_param_set));
1292                         break;
1293
1294                 case WLAN_EID_IBSS_PARAMS:
1295                         ibss_param_set =
1296                                 (struct ieee_types_ibss_param_set *)
1297                                 current_ptr;
1298                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1299                                ibss_param_set,
1300                                sizeof(struct ieee_types_ibss_param_set));
1301                         break;
1302
1303                 case WLAN_EID_ERP_INFO:
1304                         bss_entry->erp_flags = *(current_ptr + 2);
1305                         break;
1306
1307                 case WLAN_EID_PWR_CONSTRAINT:
1308                         bss_entry->local_constraint = *(current_ptr + 2);
1309                         bss_entry->sensed_11h = true;
1310                         break;
1311
1312                 case WLAN_EID_CHANNEL_SWITCH:
1313                         bss_entry->chan_sw_ie_present = true;
1314                         /* fall through */
1315                 case WLAN_EID_PWR_CAPABILITY:
1316                 case WLAN_EID_TPC_REPORT:
1317                 case WLAN_EID_QUIET:
1318                         bss_entry->sensed_11h = true;
1319                     break;
1320
1321                 case WLAN_EID_EXT_SUPP_RATES:
1322                         /*
1323                          * Only process extended supported rate
1324                          * if data rate is already found.
1325                          * Data rate IE should come before
1326                          * extended supported rate IE
1327                          */
1328                         if (found_data_rate_ie) {
1329                                 if ((element_len + rate_size) >
1330                                     MWIFIEX_SUPPORTED_RATES)
1331                                         bytes_to_copy =
1332                                                 (MWIFIEX_SUPPORTED_RATES -
1333                                                  rate_size);
1334                                 else
1335                                         bytes_to_copy = element_len;
1336
1337                                 rate = (u8 *) bss_entry->data_rates;
1338                                 rate += rate_size;
1339                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1340
1341                                 rate = (u8 *) bss_entry->supported_rates;
1342                                 rate += rate_size;
1343                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1344                         }
1345                         break;
1346
1347                 case WLAN_EID_VENDOR_SPECIFIC:
1348                         vendor_ie = (struct ieee_types_vendor_specific *)
1349                                         current_ptr;
1350
1351                         if (!memcmp
1352                             (vendor_ie->vend_hdr.oui, wpa_oui,
1353                              sizeof(wpa_oui))) {
1354                                 bss_entry->bcn_wpa_ie =
1355                                         (struct ieee_types_vendor_specific *)
1356                                         current_ptr;
1357                                 bss_entry->wpa_offset = (u16)
1358                                         (current_ptr - bss_entry->beacon_buf);
1359                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1360                                     sizeof(wmm_oui))) {
1361                                 if (total_ie_len ==
1362                                     sizeof(struct ieee_types_wmm_parameter) ||
1363                                     total_ie_len ==
1364                                     sizeof(struct ieee_types_wmm_info))
1365                                         /*
1366                                          * Only accept and copy the WMM IE if
1367                                          * it matches the size expected for the
1368                                          * WMM Info IE or the WMM Parameter IE.
1369                                          */
1370                                         memcpy((u8 *) &bss_entry->wmm_ie,
1371                                                current_ptr, total_ie_len);
1372                         }
1373                         break;
1374                 case WLAN_EID_RSN:
1375                         bss_entry->bcn_rsn_ie =
1376                                 (struct ieee_types_generic *) current_ptr;
1377                         bss_entry->rsn_offset = (u16) (current_ptr -
1378                                                         bss_entry->beacon_buf);
1379                         break;
1380                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1381                         bss_entry->bcn_wapi_ie =
1382                                 (struct ieee_types_generic *) current_ptr;
1383                         bss_entry->wapi_offset = (u16) (current_ptr -
1384                                                         bss_entry->beacon_buf);
1385                         break;
1386                 case WLAN_EID_HT_CAPABILITY:
1387                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1388                                         (current_ptr +
1389                                         sizeof(struct ieee_types_header));
1390                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1391                                         sizeof(struct ieee_types_header) -
1392                                         bss_entry->beacon_buf);
1393                         break;
1394                 case WLAN_EID_HT_OPERATION:
1395                         bss_entry->bcn_ht_oper =
1396                                 (struct ieee80211_ht_operation *)(current_ptr +
1397                                         sizeof(struct ieee_types_header));
1398                         bss_entry->ht_info_offset = (u16) (current_ptr +
1399                                         sizeof(struct ieee_types_header) -
1400                                         bss_entry->beacon_buf);
1401                         break;
1402                 case WLAN_EID_VHT_CAPABILITY:
1403                         bss_entry->disable_11ac = false;
1404                         bss_entry->bcn_vht_cap =
1405                                 (void *)(current_ptr +
1406                                          sizeof(struct ieee_types_header));
1407                         bss_entry->vht_cap_offset =
1408                                         (u16)((u8 *)bss_entry->bcn_vht_cap -
1409                                               bss_entry->beacon_buf);
1410                         break;
1411                 case WLAN_EID_VHT_OPERATION:
1412                         bss_entry->bcn_vht_oper =
1413                                 (void *)(current_ptr +
1414                                          sizeof(struct ieee_types_header));
1415                         bss_entry->vht_info_offset =
1416                                         (u16)((u8 *)bss_entry->bcn_vht_oper -
1417                                               bss_entry->beacon_buf);
1418                         break;
1419                 case WLAN_EID_BSS_COEX_2040:
1420                         bss_entry->bcn_bss_co_2040 = current_ptr;
1421                         bss_entry->bss_co_2040_offset =
1422                                 (u16) (current_ptr - bss_entry->beacon_buf);
1423                         break;
1424                 case WLAN_EID_EXT_CAPABILITY:
1425                         bss_entry->bcn_ext_cap = current_ptr;
1426                         bss_entry->ext_cap_offset =
1427                                 (u16) (current_ptr - bss_entry->beacon_buf);
1428                         break;
1429                 case WLAN_EID_OPMODE_NOTIF:
1430                         bss_entry->oper_mode = (void *)current_ptr;
1431                         bss_entry->oper_mode_offset =
1432                                         (u16)((u8 *)bss_entry->oper_mode -
1433                                               bss_entry->beacon_buf);
1434                         break;
1435                 default:
1436                         break;
1437                 }
1438
1439                 current_ptr += element_len + 2;
1440
1441                 /* Need to account for IE ID and IE Len */
1442                 bytes_left -= (element_len + 2);
1443
1444         }       /* while (bytes_left > 2) */
1445         return ret;
1446 }
1447
1448 /*
1449  * This function converts radio type scan parameter to a band configuration
1450  * to be used in join command.
1451  */
1452 static u8
1453 mwifiex_radio_type_to_band(u8 radio_type)
1454 {
1455         switch (radio_type) {
1456         case HostCmd_SCAN_RADIO_TYPE_A:
1457                 return BAND_A;
1458         case HostCmd_SCAN_RADIO_TYPE_BG:
1459         default:
1460                 return BAND_G;
1461         }
1462 }
1463
1464 /*
1465  * This is an internal function used to start a scan based on an input
1466  * configuration.
1467  *
1468  * This uses the input user scan configuration information when provided in
1469  * order to send the appropriate scan commands to firmware to populate or
1470  * update the internal driver scan table.
1471  */
1472 int mwifiex_scan_networks(struct mwifiex_private *priv,
1473                           const struct mwifiex_user_scan_cfg *user_scan_in)
1474 {
1475         int ret;
1476         struct mwifiex_adapter *adapter = priv->adapter;
1477         struct cmd_ctrl_node *cmd_node;
1478         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1479         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1480         struct mwifiex_chan_scan_param_set *scan_chan_list;
1481         u8 filtered_scan;
1482         u8 scan_current_chan_only;
1483         u8 max_chan_per_scan;
1484         unsigned long flags;
1485
1486         if (adapter->scan_processing) {
1487                 mwifiex_dbg(adapter, WARN,
1488                             "cmd: Scan already in process...\n");
1489                 return -EBUSY;
1490         }
1491
1492         if (priv->scan_block) {
1493                 mwifiex_dbg(adapter, WARN,
1494                             "cmd: Scan is blocked during association...\n");
1495                 return -EBUSY;
1496         }
1497
1498         if (test_bit(MWIFIEX_SURPRISE_REMOVED, &adapter->work_flags) ||
1499             test_bit(MWIFIEX_IS_CMD_TIMEDOUT, &adapter->work_flags)) {
1500                 mwifiex_dbg(adapter, ERROR,
1501                             "Ignore scan. Card removed or firmware in bad state\n");
1502                 return -EFAULT;
1503         }
1504
1505         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1506         adapter->scan_processing = true;
1507         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1508
1509         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1510                                GFP_KERNEL);
1511         if (!scan_cfg_out) {
1512                 ret = -ENOMEM;
1513                 goto done;
1514         }
1515
1516         scan_chan_list = kcalloc(MWIFIEX_USER_SCAN_CHAN_MAX,
1517                                  sizeof(struct mwifiex_chan_scan_param_set),
1518                                  GFP_KERNEL);
1519         if (!scan_chan_list) {
1520                 kfree(scan_cfg_out);
1521                 ret = -ENOMEM;
1522                 goto done;
1523         }
1524
1525         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1526                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1527                             &filtered_scan, &scan_current_chan_only);
1528
1529         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1530                                         &scan_cfg_out->config, chan_list_out,
1531                                         scan_chan_list);
1532
1533         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1534         if (!ret) {
1535                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1536                 if (!list_empty(&adapter->scan_pending_q)) {
1537                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1538                                                     struct cmd_ctrl_node, list);
1539                         list_del(&cmd_node->list);
1540                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1541                                                flags);
1542                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node);
1543                         queue_work(adapter->workqueue, &adapter->main_work);
1544
1545                         /* Perform internal scan synchronously */
1546                         if (!priv->scan_request) {
1547                                 mwifiex_dbg(adapter, INFO,
1548                                             "wait internal scan\n");
1549                                 mwifiex_wait_queue_complete(adapter, cmd_node);
1550                         }
1551                 } else {
1552                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1553                                                flags);
1554                 }
1555         }
1556
1557         kfree(scan_cfg_out);
1558         kfree(scan_chan_list);
1559 done:
1560         if (ret) {
1561                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1562                 adapter->scan_processing = false;
1563                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1564         }
1565         return ret;
1566 }
1567
1568 /*
1569  * This function prepares a scan command to be sent to the firmware.
1570  *
1571  * This uses the scan command configuration sent to the command processing
1572  * module in command preparation stage to configure a scan command structure
1573  * to send to firmware.
1574  *
1575  * The fixed fields specifying the BSS type and BSSID filters as well as a
1576  * variable number/length of TLVs are sent in the command to firmware.
1577  *
1578  * Preparation also includes -
1579  *      - Setting command ID, and proper size
1580  *      - Ensuring correct endian-ness
1581  */
1582 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1583                             struct mwifiex_scan_cmd_config *scan_cfg)
1584 {
1585         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1586
1587         /* Set fixed field variables in scan command */
1588         scan_cmd->bss_mode = scan_cfg->bss_mode;
1589         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1590                sizeof(scan_cmd->bssid));
1591         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1592
1593         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1594
1595         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1596         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1597                                           + sizeof(scan_cmd->bssid)
1598                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1599
1600         return 0;
1601 }
1602
1603 /*
1604  * This function checks compatibility of requested network with current
1605  * driver settings.
1606  */
1607 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1608                                         struct mwifiex_bssdescriptor *bss_desc)
1609 {
1610         int ret = -1;
1611
1612         if (!bss_desc)
1613                 return -1;
1614
1615         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1616                              (u16) bss_desc->channel, 0))) {
1617                 switch (priv->bss_mode) {
1618                 case NL80211_IFTYPE_STATION:
1619                 case NL80211_IFTYPE_ADHOC:
1620                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1621                                                             priv->bss_mode);
1622                         if (ret)
1623                                 mwifiex_dbg(priv->adapter, ERROR,
1624                                             "Incompatible network settings\n");
1625                         break;
1626                 default:
1627                         ret = 0;
1628                 }
1629         }
1630
1631         return ret;
1632 }
1633
1634 /* This function checks if SSID string contains all zeroes or length is zero */
1635 static bool mwifiex_is_hidden_ssid(struct cfg80211_ssid *ssid)
1636 {
1637         int idx;
1638
1639         for (idx = 0; idx < ssid->ssid_len; idx++) {
1640                 if (ssid->ssid[idx])
1641                         return false;
1642         }
1643
1644         return true;
1645 }
1646
1647 /* This function checks if any hidden SSID found in passive scan channels
1648  * and save those channels for specific SSID active scan
1649  */
1650 static int mwifiex_save_hidden_ssid_channels(struct mwifiex_private *priv,
1651                                              struct cfg80211_bss *bss)
1652 {
1653         struct mwifiex_bssdescriptor *bss_desc;
1654         int ret;
1655         int chid;
1656
1657         /* Allocate and fill new bss descriptor */
1658         bss_desc = kzalloc(sizeof(*bss_desc), GFP_KERNEL);
1659         if (!bss_desc)
1660                 return -ENOMEM;
1661
1662         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1663         if (ret)
1664                 goto done;
1665
1666         if (mwifiex_is_hidden_ssid(&bss_desc->ssid)) {
1667                 mwifiex_dbg(priv->adapter, INFO, "found hidden SSID\n");
1668                 for (chid = 0 ; chid < MWIFIEX_USER_SCAN_CHAN_MAX; chid++) {
1669                         if (priv->hidden_chan[chid].chan_number ==
1670                             bss->channel->hw_value)
1671                                 break;
1672
1673                         if (!priv->hidden_chan[chid].chan_number) {
1674                                 priv->hidden_chan[chid].chan_number =
1675                                         bss->channel->hw_value;
1676                                 priv->hidden_chan[chid].radio_type =
1677                                         bss->channel->band;
1678                                 priv->hidden_chan[chid].scan_type =
1679                                         MWIFIEX_SCAN_TYPE_ACTIVE;
1680                                 break;
1681                         }
1682                 }
1683         }
1684
1685 done:
1686         /* beacon_ie buffer was allocated in function
1687          * mwifiex_fill_new_bss_desc(). Free it now.
1688          */
1689         kfree(bss_desc->beacon_buf);
1690         kfree(bss_desc);
1691         return 0;
1692 }
1693
1694 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1695                                           struct cfg80211_bss *bss)
1696 {
1697         struct mwifiex_bssdescriptor *bss_desc;
1698         int ret;
1699         unsigned long flags;
1700
1701         /* Allocate and fill new bss descriptor */
1702         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor), GFP_KERNEL);
1703         if (!bss_desc)
1704                 return -ENOMEM;
1705
1706         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1707         if (ret)
1708                 goto done;
1709
1710         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1711         if (ret)
1712                 goto done;
1713
1714         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1715         /* Make a copy of current BSSID descriptor */
1716         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1717                sizeof(priv->curr_bss_params.bss_descriptor));
1718
1719         /* The contents of beacon_ie will be copied to its own buffer
1720          * in mwifiex_save_curr_bcn()
1721          */
1722         mwifiex_save_curr_bcn(priv);
1723         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1724
1725 done:
1726         /* beacon_ie buffer was allocated in function
1727          * mwifiex_fill_new_bss_desc(). Free it now.
1728          */
1729         kfree(bss_desc->beacon_buf);
1730         kfree(bss_desc);
1731         return 0;
1732 }
1733
1734 static int
1735 mwifiex_parse_single_response_buf(struct mwifiex_private *priv, u8 **bss_info,
1736                                   u32 *bytes_left, u64 fw_tsf, u8 *radio_type,
1737                                   bool ext_scan, s32 rssi_val)
1738 {
1739         struct mwifiex_adapter *adapter = priv->adapter;
1740         struct mwifiex_chan_freq_power *cfp;
1741         struct cfg80211_bss *bss;
1742         u8 bssid[ETH_ALEN];
1743         s32 rssi;
1744         const u8 *ie_buf;
1745         size_t ie_len;
1746         u16 channel = 0;
1747         u16 beacon_size = 0;
1748         u32 curr_bcn_bytes;
1749         u32 freq;
1750         u16 beacon_period;
1751         u16 cap_info_bitmap;
1752         u8 *current_ptr;
1753         u64 timestamp;
1754         struct mwifiex_fixed_bcn_param *bcn_param;
1755         struct mwifiex_bss_priv *bss_priv;
1756
1757         if (*bytes_left >= sizeof(beacon_size)) {
1758                 /* Extract & convert beacon size from command buffer */
1759                 beacon_size = get_unaligned_le16((*bss_info));
1760                 *bytes_left -= sizeof(beacon_size);
1761                 *bss_info += sizeof(beacon_size);
1762         }
1763
1764         if (!beacon_size || beacon_size > *bytes_left) {
1765                 *bss_info += *bytes_left;
1766                 *bytes_left = 0;
1767                 return -EFAULT;
1768         }
1769
1770         /* Initialize the current working beacon pointer for this BSS
1771          * iteration
1772          */
1773         current_ptr = *bss_info;
1774
1775         /* Advance the return beacon pointer past the current beacon */
1776         *bss_info += beacon_size;
1777         *bytes_left -= beacon_size;
1778
1779         curr_bcn_bytes = beacon_size;
1780
1781         /* First 5 fields are bssid, RSSI(for legacy scan only),
1782          * time stamp, beacon interval, and capability information
1783          */
1784         if (curr_bcn_bytes < ETH_ALEN + sizeof(u8) +
1785             sizeof(struct mwifiex_fixed_bcn_param)) {
1786                 mwifiex_dbg(adapter, ERROR,
1787                             "InterpretIE: not enough bytes left\n");
1788                 return -EFAULT;
1789         }
1790
1791         memcpy(bssid, current_ptr, ETH_ALEN);
1792         current_ptr += ETH_ALEN;
1793         curr_bcn_bytes -= ETH_ALEN;
1794
1795         if (!ext_scan) {
1796                 rssi = (s32) *current_ptr;
1797                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1798                 current_ptr += sizeof(u8);
1799                 curr_bcn_bytes -= sizeof(u8);
1800                 mwifiex_dbg(adapter, INFO,
1801                             "info: InterpretIE: RSSI=%d\n", rssi);
1802         } else {
1803                 rssi = rssi_val;
1804         }
1805
1806         bcn_param = (struct mwifiex_fixed_bcn_param *)current_ptr;
1807         current_ptr += sizeof(*bcn_param);
1808         curr_bcn_bytes -= sizeof(*bcn_param);
1809
1810         timestamp = le64_to_cpu(bcn_param->timestamp);
1811         beacon_period = le16_to_cpu(bcn_param->beacon_period);
1812
1813         cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1814         mwifiex_dbg(adapter, INFO,
1815                     "info: InterpretIE: capabilities=0x%X\n",
1816                     cap_info_bitmap);
1817
1818         /* Rest of the current buffer are IE's */
1819         ie_buf = current_ptr;
1820         ie_len = curr_bcn_bytes;
1821         mwifiex_dbg(adapter, INFO,
1822                     "info: InterpretIE: IELength for this AP = %d\n",
1823                     curr_bcn_bytes);
1824
1825         while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1826                 u8 element_id, element_len;
1827
1828                 element_id = *current_ptr;
1829                 element_len = *(current_ptr + 1);
1830                 if (curr_bcn_bytes < element_len +
1831                                 sizeof(struct ieee_types_header)) {
1832                         mwifiex_dbg(adapter, ERROR,
1833                                     "%s: bytes left < IE length\n", __func__);
1834                         return -EFAULT;
1835                 }
1836                 if (element_id == WLAN_EID_DS_PARAMS) {
1837                         channel = *(current_ptr +
1838                                     sizeof(struct ieee_types_header));
1839                         break;
1840                 }
1841
1842                 current_ptr += element_len + sizeof(struct ieee_types_header);
1843                 curr_bcn_bytes -= element_len +
1844                                         sizeof(struct ieee_types_header);
1845         }
1846
1847         if (channel) {
1848                 struct ieee80211_channel *chan;
1849                 u8 band;
1850
1851                 /* Skip entry if on csa closed channel */
1852                 if (channel == priv->csa_chan) {
1853                         mwifiex_dbg(adapter, WARN,
1854                                     "Dropping entry on csa closed channel\n");
1855                         return 0;
1856                 }
1857
1858                 band = BAND_G;
1859                 if (radio_type)
1860                         band = mwifiex_radio_type_to_band(*radio_type &
1861                                                           (BIT(0) | BIT(1)));
1862
1863                 cfp = mwifiex_get_cfp(priv, band, channel, 0);
1864
1865                 freq = cfp ? cfp->freq : 0;
1866
1867                 chan = ieee80211_get_channel(priv->wdev.wiphy, freq);
1868
1869                 if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1870                         bss = cfg80211_inform_bss(priv->wdev.wiphy,
1871                                             chan, CFG80211_BSS_FTYPE_UNKNOWN,
1872                                             bssid, timestamp,
1873                                             cap_info_bitmap, beacon_period,
1874                                             ie_buf, ie_len, rssi, GFP_KERNEL);
1875                         if (bss) {
1876                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1877                                 bss_priv->band = band;
1878                                 bss_priv->fw_tsf = fw_tsf;
1879                                 if (priv->media_connected &&
1880                                     !memcmp(bssid, priv->curr_bss_params.
1881                                             bss_descriptor.mac_address,
1882                                             ETH_ALEN))
1883                                         mwifiex_update_curr_bss_params(priv,
1884                                                                        bss);
1885
1886                                 if ((chan->flags & IEEE80211_CHAN_RADAR) ||
1887                                     (chan->flags & IEEE80211_CHAN_NO_IR)) {
1888                                         mwifiex_dbg(adapter, INFO,
1889                                                     "radar or passive channel %d\n",
1890                                                     channel);
1891                                         mwifiex_save_hidden_ssid_channels(priv,
1892                                                                           bss);
1893                                 }
1894
1895                                 cfg80211_put_bss(priv->wdev.wiphy, bss);
1896                         }
1897                 }
1898         } else {
1899                 mwifiex_dbg(adapter, WARN, "missing BSS channel IE\n");
1900         }
1901
1902         return 0;
1903 }
1904
1905 static void mwifiex_complete_scan(struct mwifiex_private *priv)
1906 {
1907         struct mwifiex_adapter *adapter = priv->adapter;
1908
1909         adapter->survey_idx = 0;
1910         if (adapter->curr_cmd->wait_q_enabled) {
1911                 adapter->cmd_wait_q.status = 0;
1912                 if (!priv->scan_request) {
1913                         mwifiex_dbg(adapter, INFO,
1914                                     "complete internal scan\n");
1915                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1916                 }
1917         }
1918 }
1919
1920 /* This function checks if any hidden SSID found in passive scan channels
1921  * and do specific SSID active scan for those channels
1922  */
1923 static int
1924 mwifiex_active_scan_req_for_passive_chan(struct mwifiex_private *priv)
1925 {
1926         int ret;
1927         struct mwifiex_adapter *adapter = priv->adapter;
1928         u8 id = 0;
1929         struct mwifiex_user_scan_cfg  *user_scan_cfg;
1930
1931         if (adapter->active_scan_triggered || !priv->scan_request ||
1932             priv->scan_aborting) {
1933                 adapter->active_scan_triggered = false;
1934                 return 0;
1935         }
1936
1937         if (!priv->hidden_chan[0].chan_number) {
1938                 mwifiex_dbg(adapter, INFO, "No BSS with hidden SSID found on DFS channels\n");
1939                 return 0;
1940         }
1941         user_scan_cfg = kzalloc(sizeof(*user_scan_cfg), GFP_KERNEL);
1942
1943         if (!user_scan_cfg)
1944                 return -ENOMEM;
1945
1946         for (id = 0; id < MWIFIEX_USER_SCAN_CHAN_MAX; id++) {
1947                 if (!priv->hidden_chan[id].chan_number)
1948                         break;
1949                 memcpy(&user_scan_cfg->chan_list[id],
1950                        &priv->hidden_chan[id],
1951                        sizeof(struct mwifiex_user_scan_chan));
1952         }
1953
1954         adapter->active_scan_triggered = true;
1955         if (priv->scan_request->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
1956                 ether_addr_copy(user_scan_cfg->random_mac,
1957                                 priv->scan_request->mac_addr);
1958         user_scan_cfg->num_ssids = priv->scan_request->n_ssids;
1959         user_scan_cfg->ssid_list = priv->scan_request->ssids;
1960
1961         ret = mwifiex_scan_networks(priv, user_scan_cfg);
1962         kfree(user_scan_cfg);
1963
1964         memset(&priv->hidden_chan, 0, sizeof(priv->hidden_chan));
1965
1966         if (ret) {
1967                 dev_err(priv->adapter->dev, "scan failed: %d\n", ret);
1968                 return ret;
1969         }
1970
1971         return 0;
1972 }
1973 static void mwifiex_check_next_scan_command(struct mwifiex_private *priv)
1974 {
1975         struct mwifiex_adapter *adapter = priv->adapter;
1976         struct cmd_ctrl_node *cmd_node;
1977         unsigned long flags;
1978
1979         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1980         if (list_empty(&adapter->scan_pending_q)) {
1981                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1982
1983                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1984                 adapter->scan_processing = false;
1985                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1986
1987                 mwifiex_active_scan_req_for_passive_chan(priv);
1988
1989                 if (!adapter->ext_scan)
1990                         mwifiex_complete_scan(priv);
1991
1992                 if (priv->scan_request) {
1993                         struct cfg80211_scan_info info = {
1994                                 .aborted = false,
1995                         };
1996
1997                         mwifiex_dbg(adapter, INFO,
1998                                     "info: notifying scan done\n");
1999                         cfg80211_scan_done(priv->scan_request, &info);
2000                         priv->scan_request = NULL;
2001                         priv->scan_aborting = false;
2002                 } else {
2003                         priv->scan_aborting = false;
2004                         mwifiex_dbg(adapter, INFO,
2005                                     "info: scan already aborted\n");
2006                 }
2007         } else if ((priv->scan_aborting && !priv->scan_request) ||
2008                    priv->scan_block) {
2009                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
2010
2011                 mwifiex_cancel_pending_scan_cmd(adapter);
2012
2013                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
2014                 adapter->scan_processing = false;
2015                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
2016
2017                 if (!adapter->active_scan_triggered) {
2018                         if (priv->scan_request) {
2019                                 struct cfg80211_scan_info info = {
2020                                         .aborted = true,
2021                                 };
2022
2023                                 mwifiex_dbg(adapter, INFO,
2024                                             "info: aborting scan\n");
2025                                 cfg80211_scan_done(priv->scan_request, &info);
2026                                 priv->scan_request = NULL;
2027                                 priv->scan_aborting = false;
2028                         } else {
2029                                 priv->scan_aborting = false;
2030                                 mwifiex_dbg(adapter, INFO,
2031                                             "info: scan already aborted\n");
2032                         }
2033                 }
2034         } else {
2035                 /* Get scan command from scan_pending_q and put to
2036                  * cmd_pending_q
2037                  */
2038                 cmd_node = list_first_entry(&adapter->scan_pending_q,
2039                                             struct cmd_ctrl_node, list);
2040                 list_del(&cmd_node->list);
2041                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
2042                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node);
2043         }
2044
2045         return;
2046 }
2047
2048 void mwifiex_cancel_scan(struct mwifiex_adapter *adapter)
2049 {
2050         struct mwifiex_private *priv;
2051         unsigned long cmd_flags;
2052         int i;
2053
2054         mwifiex_cancel_pending_scan_cmd(adapter);
2055
2056         if (adapter->scan_processing) {
2057                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, cmd_flags);
2058                 adapter->scan_processing = false;
2059                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, cmd_flags);
2060                 for (i = 0; i < adapter->priv_num; i++) {
2061                         priv = adapter->priv[i];
2062                         if (!priv)
2063                                 continue;
2064                         if (priv->scan_request) {
2065                                 struct cfg80211_scan_info info = {
2066                                         .aborted = true,
2067                                 };
2068
2069                                 mwifiex_dbg(adapter, INFO,
2070                                             "info: aborting scan\n");
2071                                 cfg80211_scan_done(priv->scan_request, &info);
2072                                 priv->scan_request = NULL;
2073                                 priv->scan_aborting = false;
2074                         }
2075                 }
2076         }
2077 }
2078
2079 /*
2080  * This function handles the command response of scan.
2081  *
2082  * The response buffer for the scan command has the following
2083  * memory layout:
2084  *
2085  *      .-------------------------------------------------------------.
2086  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
2087  *      .-------------------------------------------------------------.
2088  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
2089  *      .-------------------------------------------------------------.
2090  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
2091  *      .-------------------------------------------------------------.
2092  *      |  BSSDescription data (variable, size given in BufSize)      |
2093  *      .-------------------------------------------------------------.
2094  *      |  TLV data (variable, size calculated using Header->Size,    |
2095  *      |            BufSize and sizeof the fixed fields above)       |
2096  *      .-------------------------------------------------------------.
2097  */
2098 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
2099                             struct host_cmd_ds_command *resp)
2100 {
2101         int ret = 0;
2102         struct mwifiex_adapter *adapter = priv->adapter;
2103         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
2104         struct mwifiex_ie_types_data *tlv_data;
2105         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
2106         u8 *bss_info;
2107         u32 scan_resp_size;
2108         u32 bytes_left;
2109         u32 idx;
2110         u32 tlv_buf_size;
2111         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
2112         struct chan_band_param_set *chan_band;
2113         u8 is_bgscan_resp;
2114         __le64 fw_tsf = 0;
2115         u8 *radio_type;
2116         struct cfg80211_wowlan_nd_match *pmatch;
2117         struct cfg80211_sched_scan_request *nd_config = NULL;
2118
2119         is_bgscan_resp = (le16_to_cpu(resp->command)
2120                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
2121         if (is_bgscan_resp)
2122                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
2123         else
2124                 scan_rsp = &resp->params.scan_resp;
2125
2126
2127         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
2128                 mwifiex_dbg(adapter, ERROR,
2129                             "SCAN_RESP: too many AP returned (%d)\n",
2130                             scan_rsp->number_of_sets);
2131                 ret = -1;
2132                 goto check_next_scan;
2133         }
2134
2135         /* Check csa channel expiry before parsing scan response */
2136         mwifiex_11h_get_csa_closed_channel(priv);
2137
2138         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
2139         mwifiex_dbg(adapter, INFO,
2140                     "info: SCAN_RESP: bss_descript_size %d\n",
2141                     bytes_left);
2142
2143         scan_resp_size = le16_to_cpu(resp->size);
2144
2145         mwifiex_dbg(adapter, INFO,
2146                     "info: SCAN_RESP: returned %d APs before parsing\n",
2147                     scan_rsp->number_of_sets);
2148
2149         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
2150
2151         /*
2152          * The size of the TLV buffer is equal to the entire command response
2153          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
2154          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
2155          *   response header (S_DS_GEN)
2156          */
2157         tlv_buf_size = scan_resp_size - (bytes_left
2158                                          + sizeof(scan_rsp->bss_descript_size)
2159                                          + sizeof(scan_rsp->number_of_sets)
2160                                          + S_DS_GEN);
2161
2162         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
2163                                                  bss_desc_and_tlv_buffer +
2164                                                  bytes_left);
2165
2166         /* Search the TLV buffer space in the scan response for any valid
2167            TLVs */
2168         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
2169                                              TLV_TYPE_TSFTIMESTAMP,
2170                                              (struct mwifiex_ie_types_data **)
2171                                              &tsf_tlv);
2172
2173         /* Search the TLV buffer space in the scan response for any valid
2174            TLVs */
2175         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
2176                                              TLV_TYPE_CHANNELBANDLIST,
2177                                              (struct mwifiex_ie_types_data **)
2178                                              &chan_band_tlv);
2179
2180 #ifdef CONFIG_PM
2181         if (priv->wdev.wiphy->wowlan_config)
2182                 nd_config = priv->wdev.wiphy->wowlan_config->nd_config;
2183 #endif
2184
2185         if (nd_config) {
2186                 adapter->nd_info =
2187                         kzalloc(sizeof(struct cfg80211_wowlan_nd_match) +
2188                                 sizeof(struct cfg80211_wowlan_nd_match *) *
2189                                 scan_rsp->number_of_sets, GFP_ATOMIC);
2190
2191                 if (adapter->nd_info)
2192                         adapter->nd_info->n_matches = scan_rsp->number_of_sets;
2193         }
2194
2195         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
2196                 /*
2197                  * If the TSF TLV was appended to the scan results, save this
2198                  * entry's TSF value in the fw_tsf field. It is the firmware's
2199                  * TSF value at the time the beacon or probe response was
2200                  * received.
2201                  */
2202                 if (tsf_tlv)
2203                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
2204                                sizeof(fw_tsf));
2205
2206                 if (chan_band_tlv) {
2207                         chan_band = &chan_band_tlv->chan_band_param[idx];
2208                         radio_type = &chan_band->radio_type;
2209                 } else {
2210                         radio_type = NULL;
2211                 }
2212
2213                 if (chan_band_tlv && adapter->nd_info) {
2214                         adapter->nd_info->matches[idx] =
2215                                 kzalloc(sizeof(*pmatch) + sizeof(u32),
2216                                         GFP_ATOMIC);
2217
2218                         pmatch = adapter->nd_info->matches[idx];
2219
2220                         if (pmatch) {
2221                                 pmatch->n_channels = 1;
2222                                 pmatch->channels[0] = chan_band->chan_number;
2223                         }
2224                 }
2225
2226                 ret = mwifiex_parse_single_response_buf(priv, &bss_info,
2227                                                         &bytes_left,
2228                                                         le64_to_cpu(fw_tsf),
2229                                                         radio_type, false, 0);
2230                 if (ret)
2231                         goto check_next_scan;
2232         }
2233
2234 check_next_scan:
2235         mwifiex_check_next_scan_command(priv);
2236         return ret;
2237 }
2238
2239 /*
2240  * This function prepares an extended scan command to be sent to the firmware
2241  *
2242  * This uses the scan command configuration sent to the command processing
2243  * module in command preparation stage to configure a extended scan command
2244  * structure to send to firmware.
2245  */
2246 int mwifiex_cmd_802_11_scan_ext(struct mwifiex_private *priv,
2247                                 struct host_cmd_ds_command *cmd,
2248                                 void *data_buf)
2249 {
2250         struct host_cmd_ds_802_11_scan_ext *ext_scan = &cmd->params.ext_scan;
2251         struct mwifiex_scan_cmd_config *scan_cfg = data_buf;
2252
2253         memcpy(ext_scan->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
2254
2255         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN_EXT);
2256
2257         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
2258         cmd->size = cpu_to_le16((u16)(sizeof(ext_scan->reserved)
2259                                       + scan_cfg->tlv_buf_len + S_DS_GEN));
2260
2261         return 0;
2262 }
2263
2264 /* This function prepares an background scan config command to be sent
2265  * to the firmware
2266  */
2267 int mwifiex_cmd_802_11_bg_scan_config(struct mwifiex_private *priv,
2268                                       struct host_cmd_ds_command *cmd,
2269                                       void *data_buf)
2270 {
2271         struct host_cmd_ds_802_11_bg_scan_config *bgscan_config =
2272                                         &cmd->params.bg_scan_config;
2273         struct mwifiex_bg_scan_cfg *bgscan_cfg_in = data_buf;
2274         u8 *tlv_pos = bgscan_config->tlv;
2275         u8 num_probes;
2276         u32 ssid_len, chan_idx, scan_type, scan_dur, chan_num;
2277         int i;
2278         struct mwifiex_ie_types_num_probes *num_probes_tlv;
2279         struct mwifiex_ie_types_repeat_count *repeat_count_tlv;
2280         struct mwifiex_ie_types_min_rssi_threshold *rssi_threshold_tlv;
2281         struct mwifiex_ie_types_bgscan_start_later *start_later_tlv;
2282         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
2283         struct mwifiex_ie_types_chan_list_param_set *chan_list_tlv;
2284         struct mwifiex_chan_scan_param_set *temp_chan;
2285
2286         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_CONFIG);
2287         cmd->size = cpu_to_le16(sizeof(*bgscan_config) + S_DS_GEN);
2288
2289         bgscan_config->action = cpu_to_le16(bgscan_cfg_in->action);
2290         bgscan_config->enable = bgscan_cfg_in->enable;
2291         bgscan_config->bss_type = bgscan_cfg_in->bss_type;
2292         bgscan_config->scan_interval =
2293                 cpu_to_le32(bgscan_cfg_in->scan_interval);
2294         bgscan_config->report_condition =
2295                 cpu_to_le32(bgscan_cfg_in->report_condition);
2296
2297         /*  stop sched scan  */
2298         if (!bgscan_config->enable)
2299                 return 0;
2300
2301         bgscan_config->chan_per_scan = bgscan_cfg_in->chan_per_scan;
2302
2303         num_probes = (bgscan_cfg_in->num_probes ? bgscan_cfg_in->
2304                       num_probes : priv->adapter->scan_probes);
2305
2306         if (num_probes) {
2307                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *)tlv_pos;
2308                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
2309                 num_probes_tlv->header.len =
2310                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
2311                 num_probes_tlv->num_probes = cpu_to_le16((u16)num_probes);
2312
2313                 tlv_pos += sizeof(num_probes_tlv->header) +
2314                         le16_to_cpu(num_probes_tlv->header.len);
2315         }
2316
2317         if (bgscan_cfg_in->repeat_count) {
2318                 repeat_count_tlv =
2319                         (struct mwifiex_ie_types_repeat_count *)tlv_pos;
2320                 repeat_count_tlv->header.type =
2321                         cpu_to_le16(TLV_TYPE_REPEAT_COUNT);
2322                 repeat_count_tlv->header.len =
2323                         cpu_to_le16(sizeof(repeat_count_tlv->repeat_count));
2324                 repeat_count_tlv->repeat_count =
2325                         cpu_to_le16(bgscan_cfg_in->repeat_count);
2326
2327                 tlv_pos += sizeof(repeat_count_tlv->header) +
2328                         le16_to_cpu(repeat_count_tlv->header.len);
2329         }
2330
2331         if (bgscan_cfg_in->rssi_threshold) {
2332                 rssi_threshold_tlv =
2333                         (struct mwifiex_ie_types_min_rssi_threshold *)tlv_pos;
2334                 rssi_threshold_tlv->header.type =
2335                         cpu_to_le16(TLV_TYPE_RSSI_LOW);
2336                 rssi_threshold_tlv->header.len =
2337                         cpu_to_le16(sizeof(rssi_threshold_tlv->rssi_threshold));
2338                 rssi_threshold_tlv->rssi_threshold =
2339                         cpu_to_le16(bgscan_cfg_in->rssi_threshold);
2340
2341                 tlv_pos += sizeof(rssi_threshold_tlv->header) +
2342                         le16_to_cpu(rssi_threshold_tlv->header.len);
2343         }
2344
2345         for (i = 0; i < bgscan_cfg_in->num_ssids; i++) {
2346                 ssid_len = bgscan_cfg_in->ssid_list[i].ssid.ssid_len;
2347
2348                 wildcard_ssid_tlv =
2349                         (struct mwifiex_ie_types_wildcard_ssid_params *)tlv_pos;
2350                 wildcard_ssid_tlv->header.type =
2351                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
2352                 wildcard_ssid_tlv->header.len = cpu_to_le16(
2353                                 (u16)(ssid_len + sizeof(wildcard_ssid_tlv->
2354                                                          max_ssid_length)));
2355
2356                 /* max_ssid_length = 0 tells firmware to perform
2357                  * specific scan for the SSID filled, whereas
2358                  * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
2359                  * wildcard scan.
2360                  */
2361                 if (ssid_len)
2362                         wildcard_ssid_tlv->max_ssid_length = 0;
2363                 else
2364                         wildcard_ssid_tlv->max_ssid_length =
2365                                                 IEEE80211_MAX_SSID_LEN;
2366
2367                 memcpy(wildcard_ssid_tlv->ssid,
2368                        bgscan_cfg_in->ssid_list[i].ssid.ssid, ssid_len);
2369
2370                 tlv_pos += (sizeof(wildcard_ssid_tlv->header)
2371                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
2372         }
2373
2374         chan_list_tlv = (struct mwifiex_ie_types_chan_list_param_set *)tlv_pos;
2375
2376         if (bgscan_cfg_in->chan_list[0].chan_number) {
2377                 dev_dbg(priv->adapter->dev, "info: bgscan: Using supplied channel list\n");
2378
2379                 chan_list_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
2380
2381                 for (chan_idx = 0;
2382                      chan_idx < MWIFIEX_BG_SCAN_CHAN_MAX &&
2383                      bgscan_cfg_in->chan_list[chan_idx].chan_number;
2384                      chan_idx++) {
2385                         temp_chan = chan_list_tlv->chan_scan_param + chan_idx;
2386
2387                         /* Increment the TLV header length by size appended */
2388                         le16_unaligned_add_cpu(&chan_list_tlv->header.len,
2389                                                sizeof(
2390                                                chan_list_tlv->chan_scan_param));
2391
2392                         temp_chan->chan_number =
2393                                 bgscan_cfg_in->chan_list[chan_idx].chan_number;
2394                         temp_chan->radio_type =
2395                                 bgscan_cfg_in->chan_list[chan_idx].radio_type;
2396
2397                         scan_type =
2398                                 bgscan_cfg_in->chan_list[chan_idx].scan_type;
2399
2400                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
2401                                 temp_chan->chan_scan_mode_bitmap
2402                                         |= MWIFIEX_PASSIVE_SCAN;
2403                         else
2404                                 temp_chan->chan_scan_mode_bitmap
2405                                         &= ~MWIFIEX_PASSIVE_SCAN;
2406
2407                         if (bgscan_cfg_in->chan_list[chan_idx].scan_time) {
2408                                 scan_dur = (u16)bgscan_cfg_in->
2409                                         chan_list[chan_idx].scan_time;
2410                         } else {
2411                                 scan_dur = (scan_type ==
2412                                             MWIFIEX_SCAN_TYPE_PASSIVE) ?
2413                                             priv->adapter->passive_scan_time :
2414                                             priv->adapter->specific_scan_time;
2415                         }
2416
2417                         temp_chan->min_scan_time = cpu_to_le16(scan_dur);
2418                         temp_chan->max_scan_time = cpu_to_le16(scan_dur);
2419                 }
2420         } else {
2421                 dev_dbg(priv->adapter->dev,
2422                         "info: bgscan: Creating full region channel list\n");
2423                 chan_num =
2424                         mwifiex_bgscan_create_channel_list(priv, bgscan_cfg_in,
2425                                                            chan_list_tlv->
2426                                                            chan_scan_param);
2427                 le16_unaligned_add_cpu(&chan_list_tlv->header.len,
2428                                        chan_num *
2429                              sizeof(chan_list_tlv->chan_scan_param[0]));
2430         }
2431
2432         tlv_pos += (sizeof(chan_list_tlv->header)
2433                         + le16_to_cpu(chan_list_tlv->header.len));
2434
2435         if (bgscan_cfg_in->start_later) {
2436                 start_later_tlv =
2437                         (struct mwifiex_ie_types_bgscan_start_later *)tlv_pos;
2438                 start_later_tlv->header.type =
2439                         cpu_to_le16(TLV_TYPE_BGSCAN_START_LATER);
2440                 start_later_tlv->header.len =
2441                         cpu_to_le16(sizeof(start_later_tlv->start_later));
2442                 start_later_tlv->start_later =
2443                         cpu_to_le16(bgscan_cfg_in->start_later);
2444
2445                 tlv_pos += sizeof(start_later_tlv->header) +
2446                         le16_to_cpu(start_later_tlv->header.len);
2447         }
2448
2449         /* Append vendor specific IE TLV */
2450         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_BGSCAN, &tlv_pos);
2451
2452         le16_unaligned_add_cpu(&cmd->size, tlv_pos - bgscan_config->tlv);
2453
2454         return 0;
2455 }
2456
2457 int mwifiex_stop_bg_scan(struct mwifiex_private *priv)
2458 {
2459         struct mwifiex_bg_scan_cfg *bgscan_cfg;
2460
2461         if (!priv->sched_scanning) {
2462                 dev_dbg(priv->adapter->dev, "bgscan already stopped!\n");
2463                 return 0;
2464         }
2465
2466         bgscan_cfg = kzalloc(sizeof(*bgscan_cfg), GFP_KERNEL);
2467         if (!bgscan_cfg)
2468                 return -ENOMEM;
2469
2470         bgscan_cfg->bss_type = MWIFIEX_BSS_MODE_INFRA;
2471         bgscan_cfg->action = MWIFIEX_BGSCAN_ACT_SET;
2472         bgscan_cfg->enable = false;
2473
2474         if (mwifiex_send_cmd(priv, HostCmd_CMD_802_11_BG_SCAN_CONFIG,
2475                              HostCmd_ACT_GEN_SET, 0, bgscan_cfg, true)) {
2476                 kfree(bgscan_cfg);
2477                 return -EFAULT;
2478         }
2479
2480         kfree(bgscan_cfg);
2481         priv->sched_scanning = false;
2482
2483         return 0;
2484 }
2485
2486 static void
2487 mwifiex_update_chan_statistics(struct mwifiex_private *priv,
2488                                struct mwifiex_ietypes_chanstats *tlv_stat)
2489 {
2490         struct mwifiex_adapter *adapter = priv->adapter;
2491         u8 i, num_chan;
2492         struct mwifiex_fw_chan_stats *fw_chan_stats;
2493         struct mwifiex_chan_stats chan_stats;
2494
2495         fw_chan_stats = (void *)((u8 *)tlv_stat +
2496                               sizeof(struct mwifiex_ie_types_header));
2497         num_chan = le16_to_cpu(tlv_stat->header.len) /
2498                                               sizeof(struct mwifiex_chan_stats);
2499
2500         for (i = 0 ; i < num_chan; i++) {
2501                 if (adapter->survey_idx >= adapter->num_in_chan_stats) {
2502                         mwifiex_dbg(adapter, WARN,
2503                                     "FW reported too many channel results (max %d)\n",
2504                                     adapter->num_in_chan_stats);
2505                         return;
2506                 }
2507                 chan_stats.chan_num = fw_chan_stats->chan_num;
2508                 chan_stats.bandcfg = fw_chan_stats->bandcfg;
2509                 chan_stats.flags = fw_chan_stats->flags;
2510                 chan_stats.noise = fw_chan_stats->noise;
2511                 chan_stats.total_bss = le16_to_cpu(fw_chan_stats->total_bss);
2512                 chan_stats.cca_scan_dur =
2513                                        le16_to_cpu(fw_chan_stats->cca_scan_dur);
2514                 chan_stats.cca_busy_dur =
2515                                        le16_to_cpu(fw_chan_stats->cca_busy_dur);
2516                 mwifiex_dbg(adapter, INFO,
2517                             "chan=%d, noise=%d, total_network=%d scan_duration=%d, busy_duration=%d\n",
2518                             chan_stats.chan_num,
2519                             chan_stats.noise,
2520                             chan_stats.total_bss,
2521                             chan_stats.cca_scan_dur,
2522                             chan_stats.cca_busy_dur);
2523                 memcpy(&adapter->chan_stats[adapter->survey_idx++], &chan_stats,
2524                        sizeof(struct mwifiex_chan_stats));
2525                 fw_chan_stats++;
2526         }
2527 }
2528
2529 /* This function handles the command response of extended scan */
2530 int mwifiex_ret_802_11_scan_ext(struct mwifiex_private *priv,
2531                                 struct host_cmd_ds_command *resp)
2532 {
2533         struct mwifiex_adapter *adapter = priv->adapter;
2534         struct host_cmd_ds_802_11_scan_ext *ext_scan_resp;
2535         struct mwifiex_ie_types_header *tlv;
2536         struct mwifiex_ietypes_chanstats *tlv_stat;
2537         u16 buf_left, type, len;
2538
2539         struct host_cmd_ds_command *cmd_ptr;
2540         struct cmd_ctrl_node *cmd_node;
2541         unsigned long cmd_flags, scan_flags;
2542         bool complete_scan = false;
2543
2544         mwifiex_dbg(adapter, INFO, "info: EXT scan returns successfully\n");
2545
2546         ext_scan_resp = &resp->params.ext_scan;
2547
2548         tlv = (void *)ext_scan_resp->tlv_buffer;
2549         buf_left = le16_to_cpu(resp->size) - (sizeof(*ext_scan_resp) + S_DS_GEN
2550                                               - 1);
2551
2552         while (buf_left >= sizeof(struct mwifiex_ie_types_header)) {
2553                 type = le16_to_cpu(tlv->type);
2554                 len = le16_to_cpu(tlv->len);
2555
2556                 if (buf_left < (sizeof(struct mwifiex_ie_types_header) + len)) {
2557                         mwifiex_dbg(adapter, ERROR,
2558                                     "error processing scan response TLVs");
2559                         break;
2560                 }
2561
2562                 switch (type) {
2563                 case TLV_TYPE_CHANNEL_STATS:
2564                         tlv_stat = (void *)tlv;
2565                         mwifiex_update_chan_statistics(priv, tlv_stat);
2566                         break;
2567                 default:
2568                         break;
2569                 }
2570
2571                 buf_left -= len + sizeof(struct mwifiex_ie_types_header);
2572                 tlv = (void *)((u8 *)tlv + len +
2573                                sizeof(struct mwifiex_ie_types_header));
2574         }
2575
2576         spin_lock_irqsave(&adapter->cmd_pending_q_lock, cmd_flags);
2577         spin_lock_irqsave(&adapter->scan_pending_q_lock, scan_flags);
2578         if (list_empty(&adapter->scan_pending_q)) {
2579                 complete_scan = true;
2580                 list_for_each_entry(cmd_node, &adapter->cmd_pending_q, list) {
2581                         cmd_ptr = (void *)cmd_node->cmd_skb->data;
2582                         if (le16_to_cpu(cmd_ptr->command) ==
2583                             HostCmd_CMD_802_11_SCAN_EXT) {
2584                                 mwifiex_dbg(adapter, INFO,
2585                                             "Scan pending in command pending list");
2586                                 complete_scan = false;
2587                                 break;
2588                         }
2589                 }
2590         }
2591         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, scan_flags);
2592         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, cmd_flags);
2593
2594         if (complete_scan)
2595                 mwifiex_complete_scan(priv);
2596
2597         return 0;
2598 }
2599
2600 /* This function This function handles the event extended scan report. It
2601  * parses extended scan results and informs to cfg80211 stack.
2602  */
2603 int mwifiex_handle_event_ext_scan_report(struct mwifiex_private *priv,
2604                                          void *buf)
2605 {
2606         int ret = 0;
2607         struct mwifiex_adapter *adapter = priv->adapter;
2608         u8 *bss_info;
2609         u32 bytes_left, bytes_left_for_tlv, idx;
2610         u16 type, len;
2611         struct mwifiex_ie_types_data *tlv;
2612         struct mwifiex_ie_types_bss_scan_rsp *scan_rsp_tlv;
2613         struct mwifiex_ie_types_bss_scan_info *scan_info_tlv;
2614         u8 *radio_type;
2615         u64 fw_tsf = 0;
2616         s32 rssi = 0;
2617         struct mwifiex_event_scan_result *event_scan = buf;
2618         u8 num_of_set = event_scan->num_of_set;
2619         u8 *scan_resp = buf + sizeof(struct mwifiex_event_scan_result);
2620         u16 scan_resp_size = le16_to_cpu(event_scan->buf_size);
2621
2622         if (num_of_set > MWIFIEX_MAX_AP) {
2623                 mwifiex_dbg(adapter, ERROR,
2624                             "EXT_SCAN: Invalid number of AP returned (%d)!!\n",
2625                             num_of_set);
2626                 ret = -1;
2627                 goto check_next_scan;
2628         }
2629
2630         bytes_left = scan_resp_size;
2631         mwifiex_dbg(adapter, INFO,
2632                     "EXT_SCAN: size %d, returned %d APs...",
2633                     scan_resp_size, num_of_set);
2634         mwifiex_dbg_dump(adapter, CMD_D, "EXT_SCAN buffer:", buf,
2635                          scan_resp_size +
2636                          sizeof(struct mwifiex_event_scan_result));
2637
2638         tlv = (struct mwifiex_ie_types_data *)scan_resp;
2639
2640         for (idx = 0; idx < num_of_set && bytes_left; idx++) {
2641                 type = le16_to_cpu(tlv->header.type);
2642                 len = le16_to_cpu(tlv->header.len);
2643                 if (bytes_left < sizeof(struct mwifiex_ie_types_header) + len) {
2644                         mwifiex_dbg(adapter, ERROR,
2645                                     "EXT_SCAN: Error bytes left < TLV length\n");
2646                         break;
2647                 }
2648                 scan_rsp_tlv = NULL;
2649                 scan_info_tlv = NULL;
2650                 bytes_left_for_tlv = bytes_left;
2651
2652                 /* BSS response TLV with beacon or probe response buffer
2653                  * at the initial position of each descriptor
2654                  */
2655                 if (type != TLV_TYPE_BSS_SCAN_RSP)
2656                         break;
2657
2658                 bss_info = (u8 *)tlv;
2659                 scan_rsp_tlv = (struct mwifiex_ie_types_bss_scan_rsp *)tlv;
2660                 tlv = (struct mwifiex_ie_types_data *)(tlv->data + len);
2661                 bytes_left_for_tlv -=
2662                                 (len + sizeof(struct mwifiex_ie_types_header));
2663
2664                 while (bytes_left_for_tlv >=
2665                        sizeof(struct mwifiex_ie_types_header) &&
2666                        le16_to_cpu(tlv->header.type) != TLV_TYPE_BSS_SCAN_RSP) {
2667                         type = le16_to_cpu(tlv->header.type);
2668                         len = le16_to_cpu(tlv->header.len);
2669                         if (bytes_left_for_tlv <
2670                             sizeof(struct mwifiex_ie_types_header) + len) {
2671                                 mwifiex_dbg(adapter, ERROR,
2672                                             "EXT_SCAN: Error in processing TLV,\t"
2673                                             "bytes left < TLV length\n");
2674                                 scan_rsp_tlv = NULL;
2675                                 bytes_left_for_tlv = 0;
2676                                 continue;
2677                         }
2678                         switch (type) {
2679                         case TLV_TYPE_BSS_SCAN_INFO:
2680                                 scan_info_tlv =
2681                                   (struct mwifiex_ie_types_bss_scan_info *)tlv;
2682                                 if (len !=
2683                                  sizeof(struct mwifiex_ie_types_bss_scan_info) -
2684                                  sizeof(struct mwifiex_ie_types_header)) {
2685                                         bytes_left_for_tlv = 0;
2686                                         continue;
2687                                 }
2688                                 break;
2689                         default:
2690                                 break;
2691                         }
2692                         tlv = (struct mwifiex_ie_types_data *)(tlv->data + len);
2693                         bytes_left -=
2694                                 (len + sizeof(struct mwifiex_ie_types_header));
2695                         bytes_left_for_tlv -=
2696                                 (len + sizeof(struct mwifiex_ie_types_header));
2697                 }
2698
2699                 if (!scan_rsp_tlv)
2700                         break;
2701
2702                 /* Advance pointer to the beacon buffer length and
2703                  * update the bytes count so that the function
2704                  * wlan_interpret_bss_desc_with_ie() can handle the
2705                  * scan buffer withut any change
2706                  */
2707                 bss_info += sizeof(u16);
2708                 bytes_left -= sizeof(u16);
2709
2710                 if (scan_info_tlv) {
2711                         rssi = (s32)(s16)(le16_to_cpu(scan_info_tlv->rssi));
2712                         rssi *= 100;           /* Convert dBm to mBm */
2713                         mwifiex_dbg(adapter, INFO,
2714                                     "info: InterpretIE: RSSI=%d\n", rssi);
2715                         fw_tsf = le64_to_cpu(scan_info_tlv->tsf);
2716                         radio_type = &scan_info_tlv->radio_type;
2717                 } else {
2718                         radio_type = NULL;
2719                 }
2720                 ret = mwifiex_parse_single_response_buf(priv, &bss_info,
2721                                                         &bytes_left, fw_tsf,
2722                                                         radio_type, true, rssi);
2723                 if (ret)
2724                         goto check_next_scan;
2725         }
2726
2727 check_next_scan:
2728         if (!event_scan->more_event)
2729                 mwifiex_check_next_scan_command(priv);
2730
2731         return ret;
2732 }
2733
2734 /*
2735  * This function prepares command for background scan query.
2736  *
2737  * Preparation includes -
2738  *      - Setting command ID and proper size
2739  *      - Setting background scan flush parameter
2740  *      - Ensuring correct endian-ness
2741  */
2742 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
2743 {
2744         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
2745                 &cmd->params.bg_scan_query;
2746
2747         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
2748         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
2749                                 + S_DS_GEN);
2750
2751         bg_query->flush = 1;
2752
2753         return 0;
2754 }
2755
2756 /*
2757  * This function inserts scan command node to the scan pending queue.
2758  */
2759 void
2760 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
2761                        struct cmd_ctrl_node *cmd_node)
2762 {
2763         struct mwifiex_adapter *adapter = priv->adapter;
2764         unsigned long flags;
2765
2766         cmd_node->wait_q_enabled = true;
2767         cmd_node->condition = &adapter->scan_wait_q_woken;
2768         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
2769         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
2770         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
2771 }
2772
2773 /*
2774  * This function sends a scan command for all available channels to the
2775  * firmware, filtered on a specific SSID.
2776  */
2777 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
2778                                       struct cfg80211_ssid *req_ssid)
2779 {
2780         struct mwifiex_adapter *adapter = priv->adapter;
2781         int ret;
2782         struct mwifiex_user_scan_cfg *scan_cfg;
2783
2784         if (adapter->scan_processing) {
2785                 mwifiex_dbg(adapter, WARN,
2786                             "cmd: Scan already in process...\n");
2787                 return -EBUSY;
2788         }
2789
2790         if (priv->scan_block) {
2791                 mwifiex_dbg(adapter, WARN,
2792                             "cmd: Scan is blocked during association...\n");
2793                 return -EBUSY;
2794         }
2795
2796         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
2797         if (!scan_cfg)
2798                 return -ENOMEM;
2799
2800         scan_cfg->ssid_list = req_ssid;
2801         scan_cfg->num_ssids = 1;
2802
2803         ret = mwifiex_scan_networks(priv, scan_cfg);
2804
2805         kfree(scan_cfg);
2806         return ret;
2807 }
2808
2809 /*
2810  * Sends IOCTL request to start a scan.
2811  *
2812  * This function allocates the IOCTL request buffer, fills it
2813  * with requisite parameters and calls the IOCTL handler.
2814  *
2815  * Scan command can be issued for both normal scan and specific SSID
2816  * scan, depending upon whether an SSID is provided or not.
2817  */
2818 int mwifiex_request_scan(struct mwifiex_private *priv,
2819                          struct cfg80211_ssid *req_ssid)
2820 {
2821         int ret;
2822
2823         if (mutex_lock_interruptible(&priv->async_mutex)) {
2824                 mwifiex_dbg(priv->adapter, ERROR,
2825                             "%s: acquire semaphore fail\n",
2826                             __func__);
2827                 return -1;
2828         }
2829
2830         priv->adapter->scan_wait_q_woken = false;
2831
2832         if (req_ssid && req_ssid->ssid_len != 0)
2833                 /* Specific SSID scan */
2834                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
2835         else
2836                 /* Normal scan */
2837                 ret = mwifiex_scan_networks(priv, NULL);
2838
2839         mutex_unlock(&priv->async_mutex);
2840
2841         return ret;
2842 }
2843
2844 /*
2845  * This function appends the vendor specific IE TLV to a buffer.
2846  */
2847 int
2848 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
2849                             u16 vsie_mask, u8 **buffer)
2850 {
2851         int id, ret_len = 0;
2852         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
2853
2854         if (!buffer)
2855                 return 0;
2856         if (!(*buffer))
2857                 return 0;
2858
2859         /*
2860          * Traverse through the saved vendor specific IE array and append
2861          * the selected(scan/assoc/adhoc) IE as TLV to the command
2862          */
2863         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
2864                 if (priv->vs_ie[id].mask & vsie_mask) {
2865                         vs_param_set =
2866                                 (struct mwifiex_ie_types_vendor_param_set *)
2867                                 *buffer;
2868                         vs_param_set->header.type =
2869                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
2870                         vs_param_set->header.len =
2871                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
2872                                 & 0x00FF) + 2);
2873                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
2874                                le16_to_cpu(vs_param_set->header.len));
2875                         *buffer += le16_to_cpu(vs_param_set->header.len) +
2876                                    sizeof(struct mwifiex_ie_types_header);
2877                         ret_len += le16_to_cpu(vs_param_set->header.len) +
2878                                    sizeof(struct mwifiex_ie_types_header);
2879                 }
2880         }
2881         return ret_len;
2882 }
2883
2884 /*
2885  * This function saves a beacon buffer of the current BSS descriptor.
2886  *
2887  * The current beacon buffer is saved so that it can be restored in the
2888  * following cases that makes the beacon buffer not to contain the current
2889  * ssid's beacon buffer.
2890  *      - The current ssid was not found somehow in the last scan.
2891  *      - The current ssid was the last entry of the scan table and overloaded.
2892  */
2893 void
2894 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
2895 {
2896         struct mwifiex_bssdescriptor *curr_bss =
2897                 &priv->curr_bss_params.bss_descriptor;
2898
2899         if (!curr_bss->beacon_buf_size)
2900                 return;
2901
2902         /* allocate beacon buffer at 1st time; or if it's size has changed */
2903         if (!priv->curr_bcn_buf ||
2904             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
2905                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
2906
2907                 kfree(priv->curr_bcn_buf);
2908                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
2909                                              GFP_ATOMIC);
2910                 if (!priv->curr_bcn_buf)
2911                         return;
2912         }
2913
2914         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2915                curr_bss->beacon_buf_size);
2916         mwifiex_dbg(priv->adapter, INFO,
2917                     "info: current beacon saved %d\n",
2918                     priv->curr_bcn_size);
2919
2920         curr_bss->beacon_buf = priv->curr_bcn_buf;
2921
2922         /* adjust the pointers in the current BSS descriptor */
2923         if (curr_bss->bcn_wpa_ie)
2924                 curr_bss->bcn_wpa_ie =
2925                         (struct ieee_types_vendor_specific *)
2926                         (curr_bss->beacon_buf +
2927                          curr_bss->wpa_offset);
2928
2929         if (curr_bss->bcn_rsn_ie)
2930                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2931                         (curr_bss->beacon_buf +
2932                          curr_bss->rsn_offset);
2933
2934         if (curr_bss->bcn_ht_cap)
2935                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2936                         (curr_bss->beacon_buf +
2937                          curr_bss->ht_cap_offset);
2938
2939         if (curr_bss->bcn_ht_oper)
2940                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2941                         (curr_bss->beacon_buf +
2942                          curr_bss->ht_info_offset);
2943
2944         if (curr_bss->bcn_vht_cap)
2945                 curr_bss->bcn_vht_cap = (void *)(curr_bss->beacon_buf +
2946                                                  curr_bss->vht_cap_offset);
2947
2948         if (curr_bss->bcn_vht_oper)
2949                 curr_bss->bcn_vht_oper = (void *)(curr_bss->beacon_buf +
2950                                                   curr_bss->vht_info_offset);
2951
2952         if (curr_bss->bcn_bss_co_2040)
2953                 curr_bss->bcn_bss_co_2040 =
2954                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2955
2956         if (curr_bss->bcn_ext_cap)
2957                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2958                         curr_bss->ext_cap_offset;
2959
2960         if (curr_bss->oper_mode)
2961                 curr_bss->oper_mode = (void *)(curr_bss->beacon_buf +
2962                                                curr_bss->oper_mode_offset);
2963 }
2964
2965 /*
2966  * This function frees the current BSS descriptor beacon buffer.
2967  */
2968 void
2969 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2970 {
2971         kfree(priv->curr_bcn_buf);
2972         priv->curr_bcn_buf = NULL;
2973 }