drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, 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 #define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD    15
  33 #define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD   27
  34 #define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD   35
  35
  36 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  37 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  38                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  39                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  40
  41 /* Memory needed to store supported rate */
  42 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  43                                 + HOSTCMD_SUPPORTED_RATES)
  44
  45 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  46         scan */
  47 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  48         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  49                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  50                         + IEEE80211_MAX_SSID_LEN))
  51
  52 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  53 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  54                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  55                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  56                                 + CHAN_TLV_MAX_SIZE                 \
  57                                 + RATE_TLV_MAX_SIZE                 \
  58                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  59
  60
  61 union mwifiex_scan_cmd_config_tlv {
  62         /* Scan configuration (variable length) */
  63         struct mwifiex_scan_cmd_config config;
  64         /* Max allocated block */
  65         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  66 };
  67
  68 enum cipher_suite {
  69         CIPHER_SUITE_TKIP,
  70         CIPHER_SUITE_CCMP,
  71         CIPHER_SUITE_MAX
  72 };
  73 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  74         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  75         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  76 };
  77 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  78         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  79         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  80 };
  81
  82 /*
  83  * This function parses a given IE for a given OUI.
  84  *
  85  * This is used to parse a WPA/RSN IE to find if it has
  86  * a given oui in PTK.
  87  */
  88 static u8
  89 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  90 {
  91         u8 count;
  92
  93         count = iebody->ptk_cnt[0];
  94
  95         /* There could be multiple OUIs for PTK hence
  96            1) Take the length.
  97            2) Check all the OUIs for AES.
  98            3) If one of them is AES then pass success. */
  99         while (count) {
 100                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
 101                         return MWIFIEX_OUI_PRESENT;
 102
 103                 --count;
 104                 if (count)
 105                         iebody = (struct ie_body *) ((u8 *) iebody +
 106                                                 sizeof(iebody->ptk_body));
 107         }
 108
 109         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 110         return MWIFIEX_OUI_NOT_PRESENT;
 111 }
 112
 113 /*
 114  * This function checks if a given OUI is present in a RSN IE.
 115  *
 116  * The function first checks if a RSN IE is present or not in the
 117  * BSS descriptor. It tries to locate the OUI only if such an IE is
 118  * present.
 119  */
 120 static u8
 121 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 122 {
 123         u8 *oui;
 124         struct ie_body *iebody;
 125         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 126
 127         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 128                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 129                 iebody = (struct ie_body *)
 130                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 131                           RSN_GTK_OUI_OFFSET);
 132                 oui = &mwifiex_rsn_oui[cipher][0];
 133                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 134                 if (ret)
 135                         return ret;
 136         }
 137         return ret;
 138 }
 139
 140 /*
 141  * This function checks if a given OUI is present in a WPA IE.
 142  *
 143  * The function first checks if a WPA IE is present or not in the
 144  * BSS descriptor. It tries to locate the OUI only if such an IE is
 145  * present.
 146  */
 147 static u8
 148 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 149 {
 150         u8 *oui;
 151         struct ie_body *iebody;
 152         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 153
 154         if (((bss_desc->bcn_wpa_ie) &&
 155              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
 156               WLAN_EID_WPA))) {
 157                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 158                 oui = &mwifiex_wpa_oui[cipher][0];
 159                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 160                 if (ret)
 161                         return ret;
 162         }
 163         return ret;
 164 }
 165
 166 /*
 167  * This function compares two SSIDs and checks if they match.
 168  */
 169 s32
 170 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 171 {
 172         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 173                 return -1;
 174         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 175 }
 176
 177 /*
 178  * This function checks if wapi is enabled in driver and scanned network is
 179  * compatible with it.
 180  */
 181 static bool
 182 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 183                     struct mwifiex_bssdescriptor *bss_desc)
 184 {
 185         if (priv->sec_info.wapi_enabled &&
 186             (bss_desc->bcn_wapi_ie &&
 187              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 188                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 /*
 195  * This function checks if driver is configured with no security mode and
 196  * scanned network is compatible with it.
 197  */
 198 static bool
 199 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 200                       struct mwifiex_bssdescriptor *bss_desc)
 201 {
 202         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 203             !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
 204                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 205                  WLAN_EID_WPA)) &&
 206             ((!bss_desc->bcn_rsn_ie) ||
 207                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 208                  WLAN_EID_RSN)) &&
 209             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 210                 return true;
 211         }
 212         return false;
 213 }
 214
 215 /*
 216  * This function checks if static WEP is enabled in driver and scanned network
 217  * is compatible with it.
 218  */
 219 static bool
 220 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 221                           struct mwifiex_bssdescriptor *bss_desc)
 222 {
 223         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 224             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 225                 return true;
 226         }
 227         return false;
 228 }
 229
 230 /*
 231  * This function checks if wpa is enabled in driver and scanned network is
 232  * compatible with it.
 233  */
 234 static bool
 235 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 236                    struct mwifiex_bssdescriptor *bss_desc)
 237 {
 238         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 239             !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
 240             ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id == WLAN_EID_WPA))
 241            /*
 242             * Privacy bit may NOT be set in some APs like
 243             * LinkSys WRT54G && bss_desc->privacy
 244             */
 245          ) {
 246                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 247                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 248                         "EncMode=%#x privacy=%#x\n", __func__,
 249                         (bss_desc->bcn_wpa_ie) ?
 250                         (*(bss_desc->bcn_wpa_ie)).
 251                         vend_hdr.element_id : 0,
 252                         (bss_desc->bcn_rsn_ie) ?
 253                         (*(bss_desc->bcn_rsn_ie)).
 254                         ieee_hdr.element_id : 0,
 255                         (priv->sec_info.wep_enabled) ? "e" : "d",
 256                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 257                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 258                         priv->sec_info.encryption_mode,
 259                         bss_desc->privacy);
 260                 return true;
 261         }
 262         return false;
 263 }
 264
 265 /*
 266  * This function checks if wpa2 is enabled in driver and scanned network is
 267  * compatible with it.
 268  */
 269 static bool
 270 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 271                     struct mwifiex_bssdescriptor *bss_desc)
 272 {
 273         if (!priv->sec_info.wep_enabled &&
 274             !priv->sec_info.wpa_enabled &&
 275             priv->sec_info.wpa2_enabled &&
 276             ((bss_desc->bcn_rsn_ie) &&
 277              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 278                 /*
 279                  * Privacy bit may NOT be set in some APs like
 280                  * LinkSys WRT54G && bss_desc->privacy
 281                  */
 282                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 283                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 284                         "EncMode=%#x privacy=%#x\n", __func__,
 285                         (bss_desc->bcn_wpa_ie) ?
 286                         (*(bss_desc->bcn_wpa_ie)).
 287                         vend_hdr.element_id : 0,
 288                         (bss_desc->bcn_rsn_ie) ?
 289                         (*(bss_desc->bcn_rsn_ie)).
 290                         ieee_hdr.element_id : 0,
 291                         (priv->sec_info.wep_enabled) ? "e" : "d",
 292                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 293                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 294                         priv->sec_info.encryption_mode,
 295                         bss_desc->privacy);
 296                 return true;
 297         }
 298         return false;
 299 }
 300
 301 /*
 302  * This function checks if adhoc AES is enabled in driver and scanned network is
 303  * compatible with it.
 304  */
 305 static bool
 306 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 307                          struct mwifiex_bssdescriptor *bss_desc)
 308 {
 309         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 310             !priv->sec_info.wpa2_enabled &&
 311             ((!bss_desc->bcn_wpa_ie) ||
 312              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 313             ((!bss_desc->bcn_rsn_ie) ||
 314              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 315             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 316                 return true;
 317         }
 318         return false;
 319 }
 320
 321 /*
 322  * This function checks if dynamic WEP is enabled in driver and scanned network
 323  * is compatible with it.
 324  */
 325 static bool
 326 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 327                            struct mwifiex_bssdescriptor *bss_desc)
 328 {
 329         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 330             !priv->sec_info.wpa2_enabled &&
 331             ((!bss_desc->bcn_wpa_ie) ||
 332              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 333             ((!bss_desc->bcn_rsn_ie) ||
 334              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 335             priv->sec_info.encryption_mode && bss_desc->privacy) {
 336                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 337                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 338                         "EncMode=%#x privacy=%#x\n",
 339                         __func__,
 340                         (bss_desc->bcn_wpa_ie) ?
 341                         (*(bss_desc->bcn_wpa_ie)).
 342                         vend_hdr.element_id : 0,
 343                         (bss_desc->bcn_rsn_ie) ?
 344                         (*(bss_desc->bcn_rsn_ie)).
 345                         ieee_hdr.element_id : 0,
 346                         priv->sec_info.encryption_mode,
 347                         bss_desc->privacy);
 348                 return true;
 349         }
 350         return false;
 351 }
 352
 353 /*
 354  * This function checks if a scanned network is compatible with the driver
 355  * settings.
 356  *
 357  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 358  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 359  *    0       0       0      0     NONE      0     0   0   yes No security
 360  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 361  *                                                         HT if no AES)
 362  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 363  *                                                         HT if no AES)
 364  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 365  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 366  *                                                         (disable HT)
 367  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 368  *
 369  * Compatibility is not matched while roaming, except for mode.
 370  */
 371 static s32
 372 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 373                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 374 {
 375         struct mwifiex_adapter *adapter = priv->adapter;
 376
 377         bss_desc->disable_11n = false;
 378
 379         /* Don't check for compatibility if roaming */
 380         if (priv->media_connected &&
 381             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 382             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 383                 return 0;
 384
 385         if (priv->wps.session_enable) {
 386                 dev_dbg(adapter->dev,
 387                         "info: return success directly in WPS period\n");
 388                 return 0;
 389         }
 390
 391         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 392                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 393                 return 0;
 394         }
 395
 396         if (bss_desc->bss_mode == mode) {
 397                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 398                         /* No security */
 399                         return 0;
 400                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 401                         /* Static WEP enabled */
 402                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 403                         bss_desc->disable_11n = true;
 404                         return 0;
 405                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 406                         /* WPA enabled */
 407                         if (((priv->adapter->config_bands & BAND_GN ||
 408                               priv->adapter->config_bands & BAND_AN) &&
 409                              bss_desc->bcn_ht_cap) &&
 410                             !mwifiex_is_wpa_oui_present(bss_desc,
 411                                                          CIPHER_SUITE_CCMP)) {
 412
 413                                 if (mwifiex_is_wpa_oui_present
 414                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 415                                         dev_dbg(adapter->dev,
 416                                                 "info: Disable 11n if AES "
 417                                                 "is not supported by AP\n");
 418                                         bss_desc->disable_11n = true;
 419                                 } else {
 420                                         return -1;
 421                                 }
 422                         }
 423                         return 0;
 424                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 425                         /* WPA2 enabled */
 426                         if (((priv->adapter->config_bands & BAND_GN ||
 427                               priv->adapter->config_bands & BAND_AN) &&
 428                              bss_desc->bcn_ht_cap) &&
 429                             !mwifiex_is_rsn_oui_present(bss_desc,
 430                                                         CIPHER_SUITE_CCMP)) {
 431
 432                                 if (mwifiex_is_rsn_oui_present
 433                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 434                                         dev_dbg(adapter->dev,
 435                                                 "info: Disable 11n if AES "
 436                                                 "is not supported by AP\n");
 437                                         bss_desc->disable_11n = true;
 438                                 } else {
 439                                         return -1;
 440                                 }
 441                         }
 442                         return 0;
 443                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 444                         /* Ad-hoc AES enabled */
 445                         return 0;
 446                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 447                         /* Dynamic WEP enabled */
 448                         return 0;
 449                 }
 450
 451                 /* Security doesn't match */
 452                 dev_dbg(adapter->dev,
 453                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 454                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 455                         (bss_desc->bcn_wpa_ie) ?
 456                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 457                         (bss_desc->bcn_rsn_ie) ?
 458                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 459                         (priv->sec_info.wep_enabled) ? "e" : "d",
 460                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 461                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 462                         priv->sec_info.encryption_mode, bss_desc->privacy);
 463                 return -1;
 464         }
 465
 466         /* Mode doesn't match */
 467         return -1;
 468 }
 469
 470 /*
 471  * This function creates a channel list for the driver to scan, based
 472  * on region/band information.
 473  *
 474  * This routine is used for any scan that is not provided with a
 475  * specific channel list to scan.
 476  */
 477 static int
 478 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 479                                  const struct mwifiex_user_scan_cfg
 480                                                         *user_scan_in,
 481                                  struct mwifiex_chan_scan_param_set
 482                                                         *scan_chan_list,
 483                                  u8 filtered_scan)
 484 {
 485         enum ieee80211_band band;
 486         struct ieee80211_supported_band *sband;
 487         struct ieee80211_channel *ch;
 488         struct mwifiex_adapter *adapter = priv->adapter;
 489         int chan_idx = 0, i;
 490
 491         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 492
 493                 if (!priv->wdev->wiphy->bands[band])
 494                         continue;
 495
 496                 sband = priv->wdev->wiphy->bands[band];
 497
 498                 for (i = 0; (i < sband->n_channels) ; i++) {
 499                         ch = &sband->channels[i];
 500                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 501                                 continue;
 502                         scan_chan_list[chan_idx].radio_type = band;
 503
 504                         if (user_scan_in &&
 505                             user_scan_in->chan_list[0].scan_time)
 506                                 scan_chan_list[chan_idx].max_scan_time =
 507                                         cpu_to_le16((u16) user_scan_in->
 508                                         chan_list[0].scan_time);
 509                         else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 510                                 scan_chan_list[chan_idx].max_scan_time =
 511                                         cpu_to_le16(adapter->passive_scan_time);
 512                         else
 513                                 scan_chan_list[chan_idx].max_scan_time =
 514                                         cpu_to_le16(adapter->active_scan_time);
 515
 516                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 517                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 518                                         |= MWIFIEX_PASSIVE_SCAN;
 519                         else
 520                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 521                                         &= ~MWIFIEX_PASSIVE_SCAN;
 522                         scan_chan_list[chan_idx].chan_number =
 523                                                         (u32) ch->hw_value;
 524                         if (filtered_scan) {
 525                                 scan_chan_list[chan_idx].max_scan_time =
 526                                 cpu_to_le16(adapter->specific_scan_time);
 527                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 528                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 529                         }
 530                         chan_idx++;
 531                 }
 532
 533         }
 534         return chan_idx;
 535 }
 536
 537 /*
 538  * This function constructs and sends multiple scan config commands to
 539  * the firmware.
 540  *
 541  * Previous routines in the code flow have created a scan command configuration
 542  * with any requested TLVs.  This function splits the channel TLV into maximum
 543  * channels supported per scan lists and sends the portion of the channel TLV,
 544  * along with the other TLVs, to the firmware.
 545  */
 546 static int
 547 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 548                           u32 max_chan_per_scan, u8 filtered_scan,
 549                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 550                           struct mwifiex_ie_types_chan_list_param_set
 551                           *chan_tlv_out,
 552                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 553 {
 554         int ret = 0;
 555         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 556         struct mwifiex_chan_scan_param_set *start_chan;
 557
 558         u32 tlv_idx;
 559         u32 total_scan_time;
 560         u32 done_early;
 561
 562         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 563                 dev_dbg(priv->adapter->dev,
 564                         "info: Scan: Null detect: %p, %p, %p\n",
 565                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 566                 return -1;
 567         }
 568
 569         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 570
 571         /* Set the temp channel struct pointer to the start of the desired
 572            list */
 573         tmp_chan_list = scan_chan_list;
 574
 575         /* Loop through the desired channel list, sending a new firmware scan
 576            commands for each max_chan_per_scan channels (or for 1,6,11
 577            individually if configured accordingly) */
 578         while (tmp_chan_list->chan_number) {
 579
 580                 tlv_idx = 0;
 581                 total_scan_time = 0;
 582                 chan_tlv_out->header.len = 0;
 583                 start_chan = tmp_chan_list;
 584                 done_early = false;
 585
 586                 /*
 587                  * Construct the Channel TLV for the scan command.  Continue to
 588                  * insert channel TLVs until:
 589                  *   - the tlv_idx hits the maximum configured per scan command
 590                  *   - the next channel to insert is 0 (end of desired channel
 591                  *     list)
 592                  *   - done_early is set (controlling individual scanning of
 593                  *     1,6,11)
 594                  */
 595                 while (tlv_idx < max_chan_per_scan &&
 596                        tmp_chan_list->chan_number && !done_early) {
 597
 598                         dev_dbg(priv->adapter->dev,
 599                                 "info: Scan: Chan(%3d), Radio(%d),"
 600                                 " Mode(%d, %d), Dur(%d)\n",
 601                                 tmp_chan_list->chan_number,
 602                                 tmp_chan_list->radio_type,
 603                                 tmp_chan_list->chan_scan_mode_bitmap
 604                                 & MWIFIEX_PASSIVE_SCAN,
 605                                 (tmp_chan_list->chan_scan_mode_bitmap
 606                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 607                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 608
 609                         /* Copy the current channel TLV to the command being
 610                            prepared */
 611                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 612                                tmp_chan_list,
 613                                sizeof(chan_tlv_out->chan_scan_param));
 614
 615                         /* Increment the TLV header length by the size
 616                            appended */
 617                         le16_add_cpu(&chan_tlv_out->header.len,
 618                                      sizeof(chan_tlv_out->chan_scan_param));
 619
 620                         /*
 621                          * The tlv buffer length is set to the number of bytes
 622                          * of the between the channel tlv pointer and the start
 623                          * of the tlv buffer.  This compensates for any TLVs
 624                          * that were appended before the channel list.
 625                          */
 626                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 627                                                         scan_cfg_out->tlv_buf);
 628
 629                         /* Add the size of the channel tlv header and the data
 630                            length */
 631                         scan_cfg_out->tlv_buf_len +=
 632                                 (sizeof(chan_tlv_out->header)
 633                                  + le16_to_cpu(chan_tlv_out->header.len));
 634
 635                         /* Increment the index to the channel tlv we are
 636                            constructing */
 637                         tlv_idx++;
 638
 639                         /* Count the total scan time per command */
 640                         total_scan_time +=
 641                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 642
 643                         done_early = false;
 644
 645                         /* Stop the loop if the *current* channel is in the
 646                            1,6,11 set and we are not filtering on a BSSID
 647                            or SSID. */
 648                         if (!filtered_scan &&
 649                             (tmp_chan_list->chan_number == 1 ||
 650                              tmp_chan_list->chan_number == 6 ||
 651                              tmp_chan_list->chan_number == 11))
 652                                 done_early = true;
 653
 654                         /* Increment the tmp pointer to the next channel to
 655                            be scanned */
 656                         tmp_chan_list++;
 657
 658                         /* Stop the loop if the *next* channel is in the 1,6,11
 659                            set.  This will cause it to be the only channel
 660                            scanned on the next interation */
 661                         if (!filtered_scan &&
 662                             (tmp_chan_list->chan_number == 1 ||
 663                              tmp_chan_list->chan_number == 6 ||
 664                              tmp_chan_list->chan_number == 11))
 665                                 done_early = true;
 666                 }
 667
 668                 /* The total scan time should be less than scan command timeout
 669                    value */
 670                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 671                         dev_err(priv->adapter->dev, "total scan time %dms"
 672                                 " is over limit (%dms), scan skipped\n",
 673                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 674                         ret = -1;
 675                         break;
 676                 }
 677
 678                 priv->adapter->scan_channels = start_chan;
 679
 680                 /* Send the scan command to the firmware with the specified
 681                    cfg */
 682                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 683                                              HostCmd_ACT_GEN_SET, 0,
 684                                              scan_cfg_out);
 685                 if (ret)
 686                         break;
 687         }
 688
 689         if (ret)
 690                 return -1;
 691
 692         return 0;
 693 }
 694
 695 /*
 696  * This function constructs a scan command configuration structure to use
 697  * in scan commands.
 698  *
 699  * Application layer or other functions can invoke network scanning
 700  * with a scan configuration supplied in a user scan configuration structure.
 701  * This structure is used as the basis of one or many scan command configuration
 702  * commands that are sent to the command processing module and eventually to the
 703  * firmware.
 704  *
 705  * This function creates a scan command configuration structure  based on the
 706  * following user supplied parameters (if present):
 707  *      - SSID filter
 708  *      - BSSID filter
 709  *      - Number of Probes to be sent
 710  *      - Channel list
 711  *
 712  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 713  * If the number of probes is not set, adapter default setting is used.
 714  */
 715 static void
 716 mwifiex_config_scan(struct mwifiex_private *priv,
 717                     const struct mwifiex_user_scan_cfg *user_scan_in,
 718                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 719                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 720                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 721                     u8 *max_chan_per_scan, u8 *filtered_scan,
 722                     u8 *scan_current_only)
 723 {
 724         struct mwifiex_adapter *adapter = priv->adapter;
 725         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 726         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 727         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 728         u8 *tlv_pos;
 729         u32 num_probes;
 730         u32 ssid_len;
 731         u32 chan_idx;
 732         u32 chan_num;
 733         u32 scan_type;
 734         u16 scan_dur;
 735         u8 channel;
 736         u8 radio_type;
 737         int i;
 738         u8 ssid_filter;
 739         u8 rates[MWIFIEX_SUPPORTED_RATES];
 740         u32 rates_size;
 741         struct mwifiex_ie_types_htcap *ht_cap;
 742
 743         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 744            in this routine will be preserved since the routine that sends the
 745            command will append channelTLVs at *chan_list_out.  The difference
 746            between the *chan_list_out and the tlv_buf start will be used to
 747            calculate the size of anything we add in this routine. */
 748         scan_cfg_out->tlv_buf_len = 0;
 749
 750         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 751            so later routines know where channels can be added to the command
 752            buf */
 753         tlv_pos = scan_cfg_out->tlv_buf;
 754
 755         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 756            below if a SSID or BSSID filter is sent in the command */
 757         *filtered_scan = false;
 758
 759         /* Initialize the scan as not being only on the current channel.  If
 760            the channel list is customized, only contains one channel, and is
 761            the active channel, this is set true and data flow is not halted. */
 762         *scan_current_only = false;
 763
 764         if (user_scan_in) {
 765
 766                 /* Default the ssid_filter flag to TRUE, set false under
 767                    certain wildcard conditions and qualified by the existence
 768                    of an SSID list before marking the scan as filtered */
 769                 ssid_filter = true;
 770
 771                 /* Set the BSS type scan filter, use Adapter setting if
 772                    unset */
 773                 scan_cfg_out->bss_mode =
 774                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 775                          bss_mode : (u8) adapter->scan_mode);
 776
 777                 /* Set the number of probes to send, use Adapter setting
 778                    if unset */
 779                 num_probes =
 780                         (user_scan_in->num_probes ? user_scan_in->
 781                          num_probes : adapter->scan_probes);
 782
 783                 /*
 784                  * Set the BSSID filter to the incoming configuration,
 785                  * if non-zero.  If not set, it will remain disabled
 786                  * (all zeros).
 787                  */
 788                 memcpy(scan_cfg_out->specific_bssid,
 789                        user_scan_in->specific_bssid,
 790                        sizeof(scan_cfg_out->specific_bssid));
 791
 792                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 793                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 794
 795                         wildcard_ssid_tlv =
 796                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 797                                 tlv_pos;
 798                         wildcard_ssid_tlv->header.type =
 799                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 800                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 801                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 802                                                          max_ssid_length)));
 803
 804                         /*
 805                          * max_ssid_length = 0 tells firmware to perform
 806                          * specific scan for the SSID filled, whereas
 807                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 808                          * wildcard scan.
 809                          */
 810                         if (ssid_len)
 811                                 wildcard_ssid_tlv->max_ssid_length = 0;
 812                         else
 813                                 wildcard_ssid_tlv->max_ssid_length =
 814                                                         IEEE80211_MAX_SSID_LEN;
 815
 816                         memcpy(wildcard_ssid_tlv->ssid,
 817                                user_scan_in->ssid_list[i].ssid, ssid_len);
 818
 819                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 820                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 821
 822                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 823                                 i, wildcard_ssid_tlv->ssid,
 824                                 wildcard_ssid_tlv->max_ssid_length);
 825
 826                         /* Empty wildcard ssid with a maxlen will match many or
 827                            potentially all SSIDs (maxlen == 32), therefore do
 828                            not treat the scan as
 829                            filtered. */
 830                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 831                                 ssid_filter = false;
 832                 }
 833
 834                 /*
 835                  *  The default number of channels sent in the command is low to
 836                  *  ensure the response buffer from the firmware does not
 837                  *  truncate scan results.  That is not an issue with an SSID
 838                  *  or BSSID filter applied to the scan results in the firmware.
 839                  */
 840                 if ((i && ssid_filter) ||
 841                     !is_zero_ether_addr(scan_cfg_out->specific_bssid))
 842                         *filtered_scan = true;
 843         } else {
 844                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 845                 num_probes = adapter->scan_probes;
 846         }
 847
 848         /*
 849          *  If a specific BSSID or SSID is used, the number of channels in the
 850          *  scan command will be increased to the absolute maximum.
 851          */
 852         if (*filtered_scan)
 853                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 854         else
 855                 *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
 856
 857         /* If the input config or adapter has the number of Probes set,
 858            add tlv */
 859         if (num_probes) {
 860
 861                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 862                         num_probes);
 863
 864                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 865                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 866                 num_probes_tlv->header.len =
 867                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 868                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 869
 870                 tlv_pos += sizeof(num_probes_tlv->header) +
 871                         le16_to_cpu(num_probes_tlv->header.len);
 872
 873         }
 874
 875         /* Append rates tlv */
 876         memset(rates, 0, sizeof(rates));
 877
 878         rates_size = mwifiex_get_supported_rates(priv, rates);
 879
 880         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 881         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 882         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 883         memcpy(rates_tlv->rates, rates, rates_size);
 884         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 885
 886         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 887
 888         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 889             (priv->adapter->config_bands & BAND_GN ||
 890              priv->adapter->config_bands & BAND_AN)) {
 891                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 892                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 893                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 894                 ht_cap->header.len =
 895                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 896                 radio_type =
 897                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 898                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 899                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 900         }
 901
 902         /* Append vendor specific IE TLV */
 903         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 904
 905         /*
 906          * Set the output for the channel TLV to the address in the tlv buffer
 907          *   past any TLVs that were added in this function (SSID, num_probes).
 908          *   Channel TLVs will be added past this for each scan command,
 909          *   preserving the TLVs that were previously added.
 910          */
 911         *chan_list_out =
 912                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 913
 914         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 915
 916                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 917
 918                 for (chan_idx = 0;
 919                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
 920                      user_scan_in->chan_list[chan_idx].chan_number;
 921                      chan_idx++) {
 922
 923                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 924                         (scan_chan_list + chan_idx)->chan_number = channel;
 925
 926                         radio_type =
 927                                 user_scan_in->chan_list[chan_idx].radio_type;
 928                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 929
 930                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 931
 932                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 933                                 (scan_chan_list +
 934                                  chan_idx)->chan_scan_mode_bitmap
 935                                         |= MWIFIEX_PASSIVE_SCAN;
 936                         else
 937                                 (scan_chan_list +
 938                                  chan_idx)->chan_scan_mode_bitmap
 939                                         &= ~MWIFIEX_PASSIVE_SCAN;
 940
 941                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 942                                 scan_dur = (u16) user_scan_in->
 943                                         chan_list[chan_idx].scan_time;
 944                         } else {
 945                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 946                                         scan_dur = adapter->passive_scan_time;
 947                                 else if (*filtered_scan)
 948                                         scan_dur = adapter->specific_scan_time;
 949                                 else
 950                                         scan_dur = adapter->active_scan_time;
 951                         }
 952
 953                         (scan_chan_list + chan_idx)->min_scan_time =
 954                                 cpu_to_le16(scan_dur);
 955                         (scan_chan_list + chan_idx)->max_scan_time =
 956                                 cpu_to_le16(scan_dur);
 957                 }
 958
 959                 /* Check if we are only scanning the current channel */
 960                 if ((chan_idx == 1) &&
 961                     (user_scan_in->chan_list[0].chan_number ==
 962                      priv->curr_bss_params.bss_descriptor.channel)) {
 963                         *scan_current_only = true;
 964                         dev_dbg(adapter->dev,
 965                                 "info: Scan: Scanning current channel only\n");
 966                 }
 967                 chan_num = chan_idx;
 968         } else {
 969                 dev_dbg(adapter->dev,
 970                         "info: Scan: Creating full region channel list\n");
 971                 chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
 972                                                             scan_chan_list,
 973                                                             *filtered_scan);
 974         }
 975
 976         /*
 977          * In associated state we will reduce the number of channels scanned per
 978          * scan command to avoid any traffic delay/loss. This number is decided
 979          * based on total number of channels to be scanned due to constraints
 980          * of command buffers.
 981          */
 982         if (priv->media_connected) {
 983                 if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
 984                         *max_chan_per_scan = 1;
 985                 else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
 986                         *max_chan_per_scan = 2;
 987                 else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
 988                         *max_chan_per_scan = 3;
 989                 else
 990                         *max_chan_per_scan = 4;
 991         }
 992 }
 993
 994 /*
 995  * This function inspects the scan response buffer for pointers to
 996  * expected TLVs.
 997  *
 998  * TLVs can be included at the end of the scan response BSS information.
 999  *
1000  * Data in the buffer is parsed pointers to TLVs that can potentially
1001  * be passed back in the response.
1002  */
1003 static void
1004 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1005                                      struct mwifiex_ie_types_data *tlv,
1006                                      u32 tlv_buf_size, u32 req_tlv_type,
1007                                      struct mwifiex_ie_types_data **tlv_data)
1008 {
1009         struct mwifiex_ie_types_data *current_tlv;
1010         u32 tlv_buf_left;
1011         u32 tlv_type;
1012         u32 tlv_len;
1013
1014         current_tlv = tlv;
1015         tlv_buf_left = tlv_buf_size;
1016         *tlv_data = NULL;
1017
1018         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1019                 tlv_buf_size);
1020
1021         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1022
1023                 tlv_type = le16_to_cpu(current_tlv->header.type);
1024                 tlv_len = le16_to_cpu(current_tlv->header.len);
1025
1026                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1027                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1028                         break;
1029                 }
1030
1031                 if (req_tlv_type == tlv_type) {
1032                         switch (tlv_type) {
1033                         case TLV_TYPE_TSFTIMESTAMP:
1034                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1035                                         "timestamp TLV, len = %d\n", tlv_len);
1036                                 *tlv_data = current_tlv;
1037                                 break;
1038                         case TLV_TYPE_CHANNELBANDLIST:
1039                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1040                                         " band list TLV, len = %d\n", tlv_len);
1041                                 *tlv_data = current_tlv;
1042                                 break;
1043                         default:
1044                                 dev_err(adapter->dev,
1045                                         "SCAN_RESP: unhandled TLV = %d\n",
1046                                        tlv_type);
1047                                 /* Give up, this seems corrupted */
1048                                 return;
1049                         }
1050                 }
1051
1052                 if (*tlv_data)
1053                         break;
1054
1055
1056                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1057                 current_tlv =
1058                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1059                                                           tlv_len);
1060
1061         }                       /* while */
1062 }
1063
1064 /*
1065  * This function parses provided beacon buffer and updates
1066  * respective fields in bss descriptor structure.
1067  */
1068 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1069                                     struct mwifiex_bssdescriptor *bss_entry)
1070 {
1071         int ret = 0;
1072         u8 element_id;
1073         struct ieee_types_fh_param_set *fh_param_set;
1074         struct ieee_types_ds_param_set *ds_param_set;
1075         struct ieee_types_cf_param_set *cf_param_set;
1076         struct ieee_types_ibss_param_set *ibss_param_set;
1077         u8 *current_ptr;
1078         u8 *rate;
1079         u8 element_len;
1080         u16 total_ie_len;
1081         u8 bytes_to_copy;
1082         u8 rate_size;
1083         u8 found_data_rate_ie;
1084         u32 bytes_left;
1085         struct ieee_types_vendor_specific *vendor_ie;
1086         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1087         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1088
1089         found_data_rate_ie = false;
1090         rate_size = 0;
1091         current_ptr = bss_entry->beacon_buf;
1092         bytes_left = bss_entry->beacon_buf_size;
1093
1094         /* Process variable IE */
1095         while (bytes_left >= 2) {
1096                 element_id = *current_ptr;
1097                 element_len = *(current_ptr + 1);
1098                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1099
1100                 if (bytes_left < total_ie_len) {
1101                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1102                                 " IE, bytes left < IE length\n");
1103                         return -1;
1104                 }
1105                 switch (element_id) {
1106                 case WLAN_EID_SSID:
1107                         bss_entry->ssid.ssid_len = element_len;
1108                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1109                                element_len);
1110                         dev_dbg(adapter->dev,
1111                                 "info: InterpretIE: ssid: %-32s\n",
1112                                 bss_entry->ssid.ssid);
1113                         break;
1114
1115                 case WLAN_EID_SUPP_RATES:
1116                         memcpy(bss_entry->data_rates, current_ptr + 2,
1117                                element_len);
1118                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1119                                element_len);
1120                         rate_size = element_len;
1121                         found_data_rate_ie = true;
1122                         break;
1123
1124                 case WLAN_EID_FH_PARAMS:
1125                         fh_param_set =
1126                                 (struct ieee_types_fh_param_set *) current_ptr;
1127                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1128                                fh_param_set,
1129                                sizeof(struct ieee_types_fh_param_set));
1130                         break;
1131
1132                 case WLAN_EID_DS_PARAMS:
1133                         ds_param_set =
1134                                 (struct ieee_types_ds_param_set *) current_ptr;
1135
1136                         bss_entry->channel = ds_param_set->current_chan;
1137
1138                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1139                                ds_param_set,
1140                                sizeof(struct ieee_types_ds_param_set));
1141                         break;
1142
1143                 case WLAN_EID_CF_PARAMS:
1144                         cf_param_set =
1145                                 (struct ieee_types_cf_param_set *) current_ptr;
1146                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1147                                cf_param_set,
1148                                sizeof(struct ieee_types_cf_param_set));
1149                         break;
1150
1151                 case WLAN_EID_IBSS_PARAMS:
1152                         ibss_param_set =
1153                                 (struct ieee_types_ibss_param_set *)
1154                                 current_ptr;
1155                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1156                                ibss_param_set,
1157                                sizeof(struct ieee_types_ibss_param_set));
1158                         break;
1159
1160                 case WLAN_EID_ERP_INFO:
1161                         bss_entry->erp_flags = *(current_ptr + 2);
1162                         break;
1163
1164                 case WLAN_EID_EXT_SUPP_RATES:
1165                         /*
1166                          * Only process extended supported rate
1167                          * if data rate is already found.
1168                          * Data rate IE should come before
1169                          * extended supported rate IE
1170                          */
1171                         if (found_data_rate_ie) {
1172                                 if ((element_len + rate_size) >
1173                                     MWIFIEX_SUPPORTED_RATES)
1174                                         bytes_to_copy =
1175                                                 (MWIFIEX_SUPPORTED_RATES -
1176                                                  rate_size);
1177                                 else
1178                                         bytes_to_copy = element_len;
1179
1180                                 rate = (u8 *) bss_entry->data_rates;
1181                                 rate += rate_size;
1182                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1183
1184                                 rate = (u8 *) bss_entry->supported_rates;
1185                                 rate += rate_size;
1186                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1187                         }
1188                         break;
1189
1190                 case WLAN_EID_VENDOR_SPECIFIC:
1191                         vendor_ie = (struct ieee_types_vendor_specific *)
1192                                         current_ptr;
1193
1194                         if (!memcmp
1195                             (vendor_ie->vend_hdr.oui, wpa_oui,
1196                              sizeof(wpa_oui))) {
1197                                 bss_entry->bcn_wpa_ie =
1198                                         (struct ieee_types_vendor_specific *)
1199                                         current_ptr;
1200                                 bss_entry->wpa_offset = (u16)
1201                                         (current_ptr - bss_entry->beacon_buf);
1202                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1203                                     sizeof(wmm_oui))) {
1204                                 if (total_ie_len ==
1205                                     sizeof(struct ieee_types_wmm_parameter) ||
1206                                     total_ie_len ==
1207                                     sizeof(struct ieee_types_wmm_info))
1208                                         /*
1209                                          * Only accept and copy the WMM IE if
1210                                          * it matches the size expected for the
1211                                          * WMM Info IE or the WMM Parameter IE.
1212                                          */
1213                                         memcpy((u8 *) &bss_entry->wmm_ie,
1214                                                current_ptr, total_ie_len);
1215                         }
1216                         break;
1217                 case WLAN_EID_RSN:
1218                         bss_entry->bcn_rsn_ie =
1219                                 (struct ieee_types_generic *) current_ptr;
1220                         bss_entry->rsn_offset = (u16) (current_ptr -
1221                                                         bss_entry->beacon_buf);
1222                         break;
1223                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1224                         bss_entry->bcn_wapi_ie =
1225                                 (struct ieee_types_generic *) current_ptr;
1226                         bss_entry->wapi_offset = (u16) (current_ptr -
1227                                                         bss_entry->beacon_buf);
1228                         break;
1229                 case WLAN_EID_HT_CAPABILITY:
1230                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1231                                         (current_ptr +
1232                                         sizeof(struct ieee_types_header));
1233                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1234                                         sizeof(struct ieee_types_header) -
1235                                         bss_entry->beacon_buf);
1236                         break;
1237                 case WLAN_EID_HT_OPERATION:
1238                         bss_entry->bcn_ht_oper =
1239                                 (struct ieee80211_ht_operation *)(current_ptr +
1240                                         sizeof(struct ieee_types_header));
1241                         bss_entry->ht_info_offset = (u16) (current_ptr +
1242                                         sizeof(struct ieee_types_header) -
1243                                         bss_entry->beacon_buf);
1244                         break;
1245                 case WLAN_EID_BSS_COEX_2040:
1246                         bss_entry->bcn_bss_co_2040 = current_ptr +
1247                                 sizeof(struct ieee_types_header);
1248                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1249                                         sizeof(struct ieee_types_header) -
1250                                                 bss_entry->beacon_buf);
1251                         break;
1252                 case WLAN_EID_EXT_CAPABILITY:
1253                         bss_entry->bcn_ext_cap = current_ptr +
1254                                 sizeof(struct ieee_types_header);
1255                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1256                                         sizeof(struct ieee_types_header) -
1257                                         bss_entry->beacon_buf);
1258                         break;
1259                 default:
1260                         break;
1261                 }
1262
1263                 current_ptr += element_len + 2;
1264
1265                 /* Need to account for IE ID and IE Len */
1266                 bytes_left -= (element_len + 2);
1267
1268         }       /* while (bytes_left > 2) */
1269         return ret;
1270 }
1271
1272 /*
1273  * This function converts radio type scan parameter to a band configuration
1274  * to be used in join command.
1275  */
1276 static u8
1277 mwifiex_radio_type_to_band(u8 radio_type)
1278 {
1279         switch (radio_type) {
1280         case HostCmd_SCAN_RADIO_TYPE_A:
1281                 return BAND_A;
1282         case HostCmd_SCAN_RADIO_TYPE_BG:
1283         default:
1284                 return BAND_G;
1285         }
1286 }
1287
1288 /*
1289  * This is an internal function used to start a scan based on an input
1290  * configuration.
1291  *
1292  * This uses the input user scan configuration information when provided in
1293  * order to send the appropriate scan commands to firmware to populate or
1294  * update the internal driver scan table.
1295  */
1296 int mwifiex_scan_networks(struct mwifiex_private *priv,
1297                           const struct mwifiex_user_scan_cfg *user_scan_in)
1298 {
1299         int ret;
1300         struct mwifiex_adapter *adapter = priv->adapter;
1301         struct cmd_ctrl_node *cmd_node;
1302         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1303         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1304         u32 buf_size;
1305         struct mwifiex_chan_scan_param_set *scan_chan_list;
1306         u8 filtered_scan;
1307         u8 scan_current_chan_only;
1308         u8 max_chan_per_scan;
1309         unsigned long flags;
1310
1311         if (adapter->scan_processing) {
1312                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1313                 return -EBUSY;
1314         }
1315
1316         if (priv->scan_block) {
1317                 dev_err(adapter->dev,
1318                         "cmd: Scan is blocked during association...\n");
1319                 return -EBUSY;
1320         }
1321
1322         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1323         adapter->scan_processing = true;
1324         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1325
1326         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1327                                                                 GFP_KERNEL);
1328         if (!scan_cfg_out) {
1329                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1330                 ret = -ENOMEM;
1331                 goto done;
1332         }
1333
1334         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1335                                                 MWIFIEX_USER_SCAN_CHAN_MAX;
1336         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1337         if (!scan_chan_list) {
1338                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1339                 kfree(scan_cfg_out);
1340                 ret = -ENOMEM;
1341                 goto done;
1342         }
1343
1344         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1345                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1346                             &filtered_scan, &scan_current_chan_only);
1347
1348         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1349                                         &scan_cfg_out->config, chan_list_out,
1350                                         scan_chan_list);
1351
1352         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1353         if (!ret) {
1354                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1355                 if (!list_empty(&adapter->scan_pending_q)) {
1356                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1357                                                     struct cmd_ctrl_node, list);
1358                         list_del(&cmd_node->list);
1359                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1360                                                flags);
1361                         adapter->cmd_queued = cmd_node;
1362                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1363                                                         true);
1364                         queue_work(adapter->workqueue, &adapter->main_work);
1365                 } else {
1366                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1367                                                flags);
1368                 }
1369         }
1370
1371         kfree(scan_cfg_out);
1372         kfree(scan_chan_list);
1373 done:
1374         if (ret) {
1375                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1376                 adapter->scan_processing = false;
1377                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1378         }
1379         return ret;
1380 }
1381
1382 /*
1383  * This function prepares a scan command to be sent to the firmware.
1384  *
1385  * This uses the scan command configuration sent to the command processing
1386  * module in command preparation stage to configure a scan command structure
1387  * to send to firmware.
1388  *
1389  * The fixed fields specifying the BSS type and BSSID filters as well as a
1390  * variable number/length of TLVs are sent in the command to firmware.
1391  *
1392  * Preparation also includes -
1393  *      - Setting command ID, and proper size
1394  *      - Ensuring correct endian-ness
1395  */
1396 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1397                             struct mwifiex_scan_cmd_config *scan_cfg)
1398 {
1399         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1400
1401         /* Set fixed field variables in scan command */
1402         scan_cmd->bss_mode = scan_cfg->bss_mode;
1403         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1404                sizeof(scan_cmd->bssid));
1405         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1406
1407         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1408
1409         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1410         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1411                                           + sizeof(scan_cmd->bssid)
1412                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1413
1414         return 0;
1415 }
1416
1417 /*
1418  * This function checks compatibility of requested network with current
1419  * driver settings.
1420  */
1421 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1422                                         struct mwifiex_bssdescriptor *bss_desc)
1423 {
1424         int ret = -1;
1425
1426         if (!bss_desc)
1427                 return -1;
1428
1429         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1430                              (u16) bss_desc->channel, 0))) {
1431                 switch (priv->bss_mode) {
1432                 case NL80211_IFTYPE_STATION:
1433                 case NL80211_IFTYPE_ADHOC:
1434                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1435                                                             priv->bss_mode);
1436                         if (ret)
1437                                 dev_err(priv->adapter->dev,
1438                                         "Incompatible network settings\n");
1439                         break;
1440                 default:
1441                         ret = 0;
1442                 }
1443         }
1444
1445         return ret;
1446 }
1447
1448 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1449                                           struct cfg80211_bss *bss)
1450 {
1451         struct mwifiex_bssdescriptor *bss_desc;
1452         int ret;
1453         unsigned long flags;
1454
1455         /* Allocate and fill new bss descriptor */
1456         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1457                         GFP_KERNEL);
1458         if (!bss_desc) {
1459                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1460                 return -ENOMEM;
1461         }
1462
1463         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1464         if (ret)
1465                 goto done;
1466
1467         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1468         if (ret)
1469                 goto done;
1470
1471         /* Update current bss descriptor parameters */
1472         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1473         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1474         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1475         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1476         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1477         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1478         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1479         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1480         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1481                 0;
1482         priv->curr_bss_params.bss_descriptor.bcn_ht_oper = NULL;
1483         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1484                 0;
1485         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1486                 NULL;
1487         priv->curr_bss_params.bss_descriptor.
1488                 bss_co_2040_offset = 0;
1489         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1490         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1491         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1492         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1493                 0;
1494
1495         /* Make a copy of current BSSID descriptor */
1496         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1497                sizeof(priv->curr_bss_params.bss_descriptor));
1498         mwifiex_save_curr_bcn(priv);
1499         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1500
1501 done:
1502         kfree(bss_desc);
1503         return 0;
1504 }
1505
1506 /*
1507  * This function handles the command response of scan.
1508  *
1509  * The response buffer for the scan command has the following
1510  * memory layout:
1511  *
1512  *      .-------------------------------------------------------------.
1513  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1514  *      .-------------------------------------------------------------.
1515  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1516  *      .-------------------------------------------------------------.
1517  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1518  *      .-------------------------------------------------------------.
1519  *      |  BSSDescription data (variable, size given in BufSize)      |
1520  *      .-------------------------------------------------------------.
1521  *      |  TLV data (variable, size calculated using Header->Size,    |
1522  *      |            BufSize and sizeof the fixed fields above)       |
1523  *      .-------------------------------------------------------------.
1524  */
1525 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1526                             struct host_cmd_ds_command *resp)
1527 {
1528         int ret = 0;
1529         struct mwifiex_adapter *adapter = priv->adapter;
1530         struct cmd_ctrl_node *cmd_node;
1531         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1532         struct mwifiex_ie_types_data *tlv_data;
1533         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1534         u8 *bss_info;
1535         u32 scan_resp_size;
1536         u32 bytes_left;
1537         u32 idx;
1538         u32 tlv_buf_size;
1539         struct mwifiex_chan_freq_power *cfp;
1540         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1541         struct chan_band_param_set *chan_band;
1542         u8 is_bgscan_resp;
1543         unsigned long flags;
1544         struct cfg80211_bss *bss;
1545
1546         is_bgscan_resp = (le16_to_cpu(resp->command)
1547                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1548         if (is_bgscan_resp)
1549                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1550         else
1551                 scan_rsp = &resp->params.scan_resp;
1552
1553
1554         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1555                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1556                         scan_rsp->number_of_sets);
1557                 ret = -1;
1558                 goto done;
1559         }
1560
1561         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1562         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1563                 bytes_left);
1564
1565         scan_resp_size = le16_to_cpu(resp->size);
1566
1567         dev_dbg(adapter->dev,
1568                 "info: SCAN_RESP: returned %d APs before parsing\n",
1569                 scan_rsp->number_of_sets);
1570
1571         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1572
1573         /*
1574          * The size of the TLV buffer is equal to the entire command response
1575          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1576          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1577          *   response header (S_DS_GEN)
1578          */
1579         tlv_buf_size = scan_resp_size - (bytes_left
1580                                          + sizeof(scan_rsp->bss_descript_size)
1581                                          + sizeof(scan_rsp->number_of_sets)
1582                                          + S_DS_GEN);
1583
1584         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1585                                                  bss_desc_and_tlv_buffer +
1586                                                  bytes_left);
1587
1588         /* Search the TLV buffer space in the scan response for any valid
1589            TLVs */
1590         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1591                                              TLV_TYPE_TSFTIMESTAMP,
1592                                              (struct mwifiex_ie_types_data **)
1593                                              &tsf_tlv);
1594
1595         /* Search the TLV buffer space in the scan response for any valid
1596            TLVs */
1597         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1598                                              TLV_TYPE_CHANNELBANDLIST,
1599                                              (struct mwifiex_ie_types_data **)
1600                                              &chan_band_tlv);
1601
1602         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1603                 u8 bssid[ETH_ALEN];
1604                 s32 rssi;
1605                 const u8 *ie_buf;
1606                 size_t ie_len;
1607                 u16 channel = 0;
1608                 u64 fw_tsf = 0;
1609                 u16 beacon_size = 0;
1610                 u32 curr_bcn_bytes;
1611                 u32 freq;
1612                 u16 beacon_period;
1613                 u16 cap_info_bitmap;
1614                 u8 *current_ptr;
1615                 u64 timestamp;
1616                 struct mwifiex_bcn_param *bcn_param;
1617                 struct mwifiex_bss_priv *bss_priv;
1618
1619                 if (bytes_left >= sizeof(beacon_size)) {
1620                         /* Extract & convert beacon size from command buffer */
1621                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1622                         bytes_left -= sizeof(beacon_size);
1623                         bss_info += sizeof(beacon_size);
1624                 }
1625
1626                 if (!beacon_size || beacon_size > bytes_left) {
1627                         bss_info += bytes_left;
1628                         bytes_left = 0;
1629                         return -1;
1630                 }
1631
1632                 /* Initialize the current working beacon pointer for this BSS
1633                  * iteration */
1634                 current_ptr = bss_info;
1635
1636                 /* Advance the return beacon pointer past the current beacon */
1637                 bss_info += beacon_size;
1638                 bytes_left -= beacon_size;
1639
1640                 curr_bcn_bytes = beacon_size;
1641
1642                 /*
1643                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1644                  *   and capability information
1645                  */
1646                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1647                         dev_err(adapter->dev,
1648                                 "InterpretIE: not enough bytes left\n");
1649                         continue;
1650                 }
1651                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1652                 current_ptr += sizeof(*bcn_param);
1653                 curr_bcn_bytes -= sizeof(*bcn_param);
1654
1655                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1656
1657                 rssi = (s32) bcn_param->rssi;
1658                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1659                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1660
1661                 timestamp = le64_to_cpu(bcn_param->timestamp);
1662                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1663
1664                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1665                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1666                         cap_info_bitmap);
1667
1668                 /* Rest of the current buffer are IE's */
1669                 ie_buf = current_ptr;
1670                 ie_len = curr_bcn_bytes;
1671                 dev_dbg(adapter->dev,
1672                         "info: InterpretIE: IELength for this AP = %d\n",
1673                         curr_bcn_bytes);
1674
1675                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1676                         u8 element_id, element_len;
1677
1678                         element_id = *current_ptr;
1679                         element_len = *(current_ptr + 1);
1680                         if (curr_bcn_bytes < element_len +
1681                                         sizeof(struct ieee_types_header)) {
1682                                 dev_err(priv->adapter->dev,
1683                                         "%s: bytes left < IE length\n",
1684                                         __func__);
1685                                 goto done;
1686                         }
1687                         if (element_id == WLAN_EID_DS_PARAMS) {
1688                                 channel = *(current_ptr + sizeof(struct ieee_types_header));
1689                                 break;
1690                         }
1691
1692                         current_ptr += element_len +
1693                                         sizeof(struct ieee_types_header);
1694                         curr_bcn_bytes -= element_len +
1695                                         sizeof(struct ieee_types_header);
1696                 }
1697
1698                 /*
1699                  * If the TSF TLV was appended to the scan results, save this
1700                  * entry's TSF value in the fw_tsf field. It is the firmware's
1701                  * TSF value at the time the beacon or probe response was
1702                  * received.
1703                  */
1704                 if (tsf_tlv)
1705                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1706                                sizeof(fw_tsf));
1707
1708                 if (channel) {
1709                         struct ieee80211_channel *chan;
1710                         u8 band;
1711
1712                         band = BAND_G;
1713                         if (chan_band_tlv) {
1714                                 chan_band =
1715                                         &chan_band_tlv->chan_band_param[idx];
1716                                 band = mwifiex_radio_type_to_band(
1717                                                 chan_band->radio_type
1718                                                 & (BIT(0) | BIT(1)));
1719                         }
1720
1721                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1722
1723                         freq = cfp ? cfp->freq : 0;
1724
1725                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1726
1727                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1728                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1729                                               chan, bssid, timestamp,
1730                                               cap_info_bitmap, beacon_period,
1731                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1732                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1733                                 bss_priv->band = band;
1734                                 bss_priv->fw_tsf = fw_tsf;
1735                                 if (priv->media_connected &&
1736                                     !memcmp(bssid,
1737                                             priv->curr_bss_params.bss_descriptor
1738                                             .mac_address, ETH_ALEN))
1739                                         mwifiex_update_curr_bss_params(priv,
1740                                                                        bss);
1741                                 cfg80211_put_bss(bss);
1742                         }
1743                 } else {
1744                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1745                 }
1746         }
1747
1748         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1749         if (list_empty(&adapter->scan_pending_q)) {
1750                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1751                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1752                 adapter->scan_processing = false;
1753                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1754
1755                 /* Need to indicate IOCTL complete */
1756                 if (adapter->curr_cmd->wait_q_enabled) {
1757                         adapter->cmd_wait_q.status = 0;
1758                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1759                 }
1760                 if (priv->report_scan_result)
1761                         priv->report_scan_result = false;
1762                 if (priv->scan_pending_on_block) {
1763                         priv->scan_pending_on_block = false;
1764                         up(&priv->async_sem);
1765                 }
1766
1767                 if (priv->user_scan_cfg) {
1768                         dev_dbg(priv->adapter->dev,
1769                                 "info: %s: sending scan results\n", __func__);
1770                         cfg80211_scan_done(priv->scan_request, 0);
1771                         priv->scan_request = NULL;
1772                         kfree(priv->user_scan_cfg);
1773                         priv->user_scan_cfg = NULL;
1774                 }
1775         } else {
1776                 if (!mwifiex_wmm_lists_empty(adapter)) {
1777                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1778                                                flags);
1779                         adapter->scan_delay_cnt = 1;
1780                         mod_timer(&priv->scan_delay_timer, jiffies +
1781                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
1782                 } else {
1783                         /* Get scan command from scan_pending_q and put to
1784                            cmd_pending_q */
1785                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1786                                                     struct cmd_ctrl_node, list);
1787                         list_del(&cmd_node->list);
1788                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1789                                                flags);
1790                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1791                                                         true);
1792                 }
1793         }
1794
1795 done:
1796         return ret;
1797 }
1798
1799 /*
1800  * This function prepares command for background scan query.
1801  *
1802  * Preparation includes -
1803  *      - Setting command ID and proper size
1804  *      - Setting background scan flush parameter
1805  *      - Ensuring correct endian-ness
1806  */
1807 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1808 {
1809         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1810                 &cmd->params.bg_scan_query;
1811
1812         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1813         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1814                                 + S_DS_GEN);
1815
1816         bg_query->flush = 1;
1817
1818         return 0;
1819 }
1820
1821 /*
1822  * This function inserts scan command node to the scan pending queue.
1823  */
1824 void
1825 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1826                        struct cmd_ctrl_node *cmd_node)
1827 {
1828         struct mwifiex_adapter *adapter = priv->adapter;
1829         unsigned long flags;
1830
1831         cmd_node->wait_q_enabled = true;
1832         cmd_node->condition = &adapter->scan_wait_q_woken;
1833         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1834         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1835         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1836 }
1837
1838 /*
1839  * This function sends a scan command for all available channels to the
1840  * firmware, filtered on a specific SSID.
1841  */
1842 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1843                                       struct cfg80211_ssid *req_ssid)
1844 {
1845         struct mwifiex_adapter *adapter = priv->adapter;
1846         int ret;
1847         struct mwifiex_user_scan_cfg *scan_cfg;
1848
1849         if (adapter->scan_processing) {
1850                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1851                 return -EBUSY;
1852         }
1853
1854         if (priv->scan_block) {
1855                 dev_err(adapter->dev,
1856                         "cmd: Scan is blocked during association...\n");
1857                 return -EBUSY;
1858         }
1859
1860         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1861         if (!scan_cfg) {
1862                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1863                 return -ENOMEM;
1864         }
1865
1866         scan_cfg->ssid_list = req_ssid;
1867         scan_cfg->num_ssids = 1;
1868
1869         ret = mwifiex_scan_networks(priv, scan_cfg);
1870
1871         kfree(scan_cfg);
1872         return ret;
1873 }
1874
1875 /*
1876  * Sends IOCTL request to start a scan.
1877  *
1878  * This function allocates the IOCTL request buffer, fills it
1879  * with requisite parameters and calls the IOCTL handler.
1880  *
1881  * Scan command can be issued for both normal scan and specific SSID
1882  * scan, depending upon whether an SSID is provided or not.
1883  */
1884 int mwifiex_request_scan(struct mwifiex_private *priv,
1885                          struct cfg80211_ssid *req_ssid)
1886 {
1887         int ret;
1888
1889         if (down_interruptible(&priv->async_sem)) {
1890                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1891                         __func__);
1892                 return -1;
1893         }
1894         priv->scan_pending_on_block = true;
1895
1896         priv->adapter->scan_wait_q_woken = false;
1897
1898         if (req_ssid && req_ssid->ssid_len != 0)
1899                 /* Specific SSID scan */
1900                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1901         else
1902                 /* Normal scan */
1903                 ret = mwifiex_scan_networks(priv, NULL);
1904
1905         if (!ret)
1906                 ret = mwifiex_wait_queue_complete(priv->adapter);
1907
1908         if (ret == -1) {
1909                 priv->scan_pending_on_block = false;
1910                 up(&priv->async_sem);
1911         }
1912
1913         return ret;
1914 }
1915
1916 /*
1917  * This function appends the vendor specific IE TLV to a buffer.
1918  */
1919 int
1920 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1921                             u16 vsie_mask, u8 **buffer)
1922 {
1923         int id, ret_len = 0;
1924         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1925
1926         if (!buffer)
1927                 return 0;
1928         if (!(*buffer))
1929                 return 0;
1930
1931         /*
1932          * Traverse through the saved vendor specific IE array and append
1933          * the selected(scan/assoc/adhoc) IE as TLV to the command
1934          */
1935         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1936                 if (priv->vs_ie[id].mask & vsie_mask) {
1937                         vs_param_set =
1938                                 (struct mwifiex_ie_types_vendor_param_set *)
1939                                 *buffer;
1940                         vs_param_set->header.type =
1941                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1942                         vs_param_set->header.len =
1943                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1944                                 & 0x00FF) + 2);
1945                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1946                                le16_to_cpu(vs_param_set->header.len));
1947                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1948                                    sizeof(struct mwifiex_ie_types_header);
1949                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1950                                    sizeof(struct mwifiex_ie_types_header);
1951                 }
1952         }
1953         return ret_len;
1954 }
1955
1956 /*
1957  * This function saves a beacon buffer of the current BSS descriptor.
1958  *
1959  * The current beacon buffer is saved so that it can be restored in the
1960  * following cases that makes the beacon buffer not to contain the current
1961  * ssid's beacon buffer.
1962  *      - The current ssid was not found somehow in the last scan.
1963  *      - The current ssid was the last entry of the scan table and overloaded.
1964  */
1965 void
1966 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1967 {
1968         struct mwifiex_bssdescriptor *curr_bss =
1969                 &priv->curr_bss_params.bss_descriptor;
1970
1971         if (!curr_bss->beacon_buf_size)
1972                 return;
1973
1974         /* allocate beacon buffer at 1st time; or if it's size has changed */
1975         if (!priv->curr_bcn_buf ||
1976             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1977                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1978
1979                 kfree(priv->curr_bcn_buf);
1980                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1981                                              GFP_ATOMIC);
1982                 if (!priv->curr_bcn_buf) {
1983                         dev_err(priv->adapter->dev,
1984                                 "failed to alloc curr_bcn_buf\n");
1985                         return;
1986                 }
1987         }
1988
1989         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
1990                curr_bss->beacon_buf_size);
1991         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
1992                 priv->curr_bcn_size);
1993
1994         curr_bss->beacon_buf = priv->curr_bcn_buf;
1995
1996         /* adjust the pointers in the current BSS descriptor */
1997         if (curr_bss->bcn_wpa_ie)
1998                 curr_bss->bcn_wpa_ie =
1999                         (struct ieee_types_vendor_specific *)
2000                         (curr_bss->beacon_buf +
2001                          curr_bss->wpa_offset);
2002
2003         if (curr_bss->bcn_rsn_ie)
2004                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2005                         (curr_bss->beacon_buf +
2006                          curr_bss->rsn_offset);
2007
2008         if (curr_bss->bcn_ht_cap)
2009                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2010                         (curr_bss->beacon_buf +
2011                          curr_bss->ht_cap_offset);
2012
2013         if (curr_bss->bcn_ht_oper)
2014                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2015                         (curr_bss->beacon_buf +
2016                          curr_bss->ht_info_offset);
2017
2018         if (curr_bss->bcn_bss_co_2040)
2019                 curr_bss->bcn_bss_co_2040 =
2020                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2021
2022         if (curr_bss->bcn_ext_cap)
2023                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2024                         curr_bss->ext_cap_offset;
2025 }
2026
2027 /*
2028  * This function frees the current BSS descriptor beacon buffer.
2029  */
2030 void
2031 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2032 {
2033         kfree(priv->curr_bcn_buf);
2034         priv->curr_bcn_buf = NULL;
2035 }