drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011-2014, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD       4
  32
  33 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  34 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  35                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  36                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  37
  38 /* Memory needed to store supported rate */
  39 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  40                                 + HOSTCMD_SUPPORTED_RATES)
  41
  42 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  43         scan */
  44 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  45         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  46                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  47                         + IEEE80211_MAX_SSID_LEN))
  48
  49 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  50 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  51                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  52                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  53                                 + CHAN_TLV_MAX_SIZE                 \
  54                                 + RATE_TLV_MAX_SIZE                 \
  55                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  56
  57
  58 union mwifiex_scan_cmd_config_tlv {
  59         /* Scan configuration (variable length) */
  60         struct mwifiex_scan_cmd_config config;
  61         /* Max allocated block */
  62         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  63 };
  64
  65 enum cipher_suite {
  66         CIPHER_SUITE_TKIP,
  67         CIPHER_SUITE_CCMP,
  68         CIPHER_SUITE_MAX
  69 };
  70 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  71         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  72         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  73 };
  74 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  75         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  76         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  77 };
  78
  79 /*
  80  * This function parses a given IE for a given OUI.
  81  *
  82  * This is used to parse a WPA/RSN IE to find if it has
  83  * a given oui in PTK.
  84  */
  85 static u8
  86 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  87 {
  88         u8 count;
  89
  90         count = iebody->ptk_cnt[0];
  91
  92         /* There could be multiple OUIs for PTK hence
  93            1) Take the length.
  94            2) Check all the OUIs for AES.
  95            3) If one of them is AES then pass success. */
  96         while (count) {
  97                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
  98                         return MWIFIEX_OUI_PRESENT;
  99
 100                 --count;
 101                 if (count)
 102                         iebody = (struct ie_body *) ((u8 *) iebody +
 103                                                 sizeof(iebody->ptk_body));
 104         }
 105
 106         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 107         return MWIFIEX_OUI_NOT_PRESENT;
 108 }
 109
 110 /*
 111  * This function checks if a given OUI is present in a RSN IE.
 112  *
 113  * The function first checks if a RSN IE is present or not in the
 114  * BSS descriptor. It tries to locate the OUI only if such an IE is
 115  * present.
 116  */
 117 static u8
 118 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 119 {
 120         u8 *oui;
 121         struct ie_body *iebody;
 122         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 123
 124         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 125                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 126                 iebody = (struct ie_body *)
 127                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 128                           RSN_GTK_OUI_OFFSET);
 129                 oui = &mwifiex_rsn_oui[cipher][0];
 130                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 131                 if (ret)
 132                         return ret;
 133         }
 134         return ret;
 135 }
 136
 137 /*
 138  * This function checks if a given OUI is present in a WPA IE.
 139  *
 140  * The function first checks if a WPA IE is present or not in the
 141  * BSS descriptor. It tries to locate the OUI only if such an IE is
 142  * present.
 143  */
 144 static u8
 145 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 146 {
 147         u8 *oui;
 148         struct ie_body *iebody;
 149         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 150
 151         if (((bss_desc->bcn_wpa_ie) &&
 152              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
 153               WLAN_EID_VENDOR_SPECIFIC))) {
 154                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 155                 oui = &mwifiex_wpa_oui[cipher][0];
 156                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 157                 if (ret)
 158                         return ret;
 159         }
 160         return ret;
 161 }
 162
 163 /*
 164  * This function compares two SSIDs and checks if they match.
 165  */
 166 s32
 167 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 168 {
 169         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 170                 return -1;
 171         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 172 }
 173
 174 /*
 175  * This function checks if wapi is enabled in driver and scanned network is
 176  * compatible with it.
 177  */
 178 static bool
 179 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 180                     struct mwifiex_bssdescriptor *bss_desc)
 181 {
 182         if (priv->sec_info.wapi_enabled &&
 183             (bss_desc->bcn_wapi_ie &&
 184              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 185                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 186                 return true;
 187         }
 188         return false;
 189 }
 190
 191 /*
 192  * This function checks if driver is configured with no security mode and
 193  * scanned network is compatible with it.
 194  */
 195 static bool
 196 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 197                       struct mwifiex_bssdescriptor *bss_desc)
 198 {
 199         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 200             !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
 201                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 202                  WLAN_EID_VENDOR_SPECIFIC)) &&
 203             ((!bss_desc->bcn_rsn_ie) ||
 204                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 205                  WLAN_EID_RSN)) &&
 206             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 207                 return true;
 208         }
 209         return false;
 210 }
 211
 212 /*
 213  * This function checks if static WEP is enabled in driver and scanned network
 214  * is compatible with it.
 215  */
 216 static bool
 217 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 218                           struct mwifiex_bssdescriptor *bss_desc)
 219 {
 220         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 221             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 222                 return true;
 223         }
 224         return false;
 225 }
 226
 227 /*
 228  * This function checks if wpa is enabled in driver and scanned network is
 229  * compatible with it.
 230  */
 231 static bool
 232 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 233                    struct mwifiex_bssdescriptor *bss_desc)
 234 {
 235         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 236             !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
 237             ((*(bss_desc->bcn_wpa_ie)).
 238              vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC))
 239            /*
 240             * Privacy bit may NOT be set in some APs like
 241             * LinkSys WRT54G && bss_desc->privacy
 242             */
 243          ) {
 244                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 245                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 246                         "EncMode=%#x privacy=%#x\n", __func__,
 247                         (bss_desc->bcn_wpa_ie) ?
 248                         (*(bss_desc->bcn_wpa_ie)).
 249                         vend_hdr.element_id : 0,
 250                         (bss_desc->bcn_rsn_ie) ?
 251                         (*(bss_desc->bcn_rsn_ie)).
 252                         ieee_hdr.element_id : 0,
 253                         (priv->sec_info.wep_enabled) ? "e" : "d",
 254                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 255                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 256                         priv->sec_info.encryption_mode,
 257                         bss_desc->privacy);
 258                 return true;
 259         }
 260         return false;
 261 }
 262
 263 /*
 264  * This function checks if wpa2 is enabled in driver and scanned network is
 265  * compatible with it.
 266  */
 267 static bool
 268 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 269                     struct mwifiex_bssdescriptor *bss_desc)
 270 {
 271         if (!priv->sec_info.wep_enabled &&
 272             !priv->sec_info.wpa_enabled &&
 273             priv->sec_info.wpa2_enabled &&
 274             ((bss_desc->bcn_rsn_ie) &&
 275              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 276                 /*
 277                  * Privacy bit may NOT be set in some APs like
 278                  * LinkSys WRT54G && bss_desc->privacy
 279                  */
 280                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 281                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 282                         "EncMode=%#x privacy=%#x\n", __func__,
 283                         (bss_desc->bcn_wpa_ie) ?
 284                         (*(bss_desc->bcn_wpa_ie)).
 285                         vend_hdr.element_id : 0,
 286                         (bss_desc->bcn_rsn_ie) ?
 287                         (*(bss_desc->bcn_rsn_ie)).
 288                         ieee_hdr.element_id : 0,
 289                         (priv->sec_info.wep_enabled) ? "e" : "d",
 290                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 291                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 292                         priv->sec_info.encryption_mode,
 293                         bss_desc->privacy);
 294                 return true;
 295         }
 296         return false;
 297 }
 298
 299 /*
 300  * This function checks if adhoc AES is enabled in driver and scanned network is
 301  * compatible with it.
 302  */
 303 static bool
 304 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 305                          struct mwifiex_bssdescriptor *bss_desc)
 306 {
 307         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 308             !priv->sec_info.wpa2_enabled &&
 309             ((!bss_desc->bcn_wpa_ie) ||
 310              ((*(bss_desc->bcn_wpa_ie)).
 311               vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
 312             ((!bss_desc->bcn_rsn_ie) ||
 313              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 314             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 315                 return true;
 316         }
 317         return false;
 318 }
 319
 320 /*
 321  * This function checks if dynamic WEP is enabled in driver and scanned network
 322  * is compatible with it.
 323  */
 324 static bool
 325 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 326                            struct mwifiex_bssdescriptor *bss_desc)
 327 {
 328         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 329             !priv->sec_info.wpa2_enabled &&
 330             ((!bss_desc->bcn_wpa_ie) ||
 331              ((*(bss_desc->bcn_wpa_ie)).
 332               vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
 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 (bss_desc->chan_sw_ie_present) {
 392                 dev_err(adapter->dev,
 393                         "Don't connect to AP with WLAN_EID_CHANNEL_SWITCH\n");
 394                 return -1;
 395         }
 396
 397         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 398                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 399                 return 0;
 400         }
 401
 402         if (bss_desc->bss_mode == mode) {
 403                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 404                         /* No security */
 405                         return 0;
 406                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 407                         /* Static WEP enabled */
 408                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 409                         bss_desc->disable_11n = true;
 410                         return 0;
 411                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 412                         /* WPA enabled */
 413                         if (((priv->adapter->config_bands & BAND_GN ||
 414                               priv->adapter->config_bands & BAND_AN) &&
 415                              bss_desc->bcn_ht_cap) &&
 416                             !mwifiex_is_wpa_oui_present(bss_desc,
 417                                                          CIPHER_SUITE_CCMP)) {
 418
 419                                 if (mwifiex_is_wpa_oui_present
 420                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 421                                         dev_dbg(adapter->dev,
 422                                                 "info: Disable 11n if AES "
 423                                                 "is not supported by AP\n");
 424                                         bss_desc->disable_11n = true;
 425                                 } else {
 426                                         return -1;
 427                                 }
 428                         }
 429                         return 0;
 430                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 431                         /* WPA2 enabled */
 432                         if (((priv->adapter->config_bands & BAND_GN ||
 433                               priv->adapter->config_bands & BAND_AN) &&
 434                              bss_desc->bcn_ht_cap) &&
 435                             !mwifiex_is_rsn_oui_present(bss_desc,
 436                                                         CIPHER_SUITE_CCMP)) {
 437
 438                                 if (mwifiex_is_rsn_oui_present
 439                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 440                                         dev_dbg(adapter->dev,
 441                                                 "info: Disable 11n if AES "
 442                                                 "is not supported by AP\n");
 443                                         bss_desc->disable_11n = true;
 444                                 } else {
 445                                         return -1;
 446                                 }
 447                         }
 448                         return 0;
 449                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 450                         /* Ad-hoc AES enabled */
 451                         return 0;
 452                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 453                         /* Dynamic WEP enabled */
 454                         return 0;
 455                 }
 456
 457                 /* Security doesn't match */
 458                 dev_dbg(adapter->dev,
 459                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 460                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 461                         (bss_desc->bcn_wpa_ie) ?
 462                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 463                         (bss_desc->bcn_rsn_ie) ?
 464                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 465                         (priv->sec_info.wep_enabled) ? "e" : "d",
 466                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 467                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 468                         priv->sec_info.encryption_mode, bss_desc->privacy);
 469                 return -1;
 470         }
 471
 472         /* Mode doesn't match */
 473         return -1;
 474 }
 475
 476 /*
 477  * This function creates a channel list for the driver to scan, based
 478  * on region/band information.
 479  *
 480  * This routine is used for any scan that is not provided with a
 481  * specific channel list to scan.
 482  */
 483 static int
 484 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 485                                  const struct mwifiex_user_scan_cfg
 486                                                         *user_scan_in,
 487                                  struct mwifiex_chan_scan_param_set
 488                                                         *scan_chan_list,
 489                                  u8 filtered_scan)
 490 {
 491         enum ieee80211_band band;
 492         struct ieee80211_supported_band *sband;
 493         struct ieee80211_channel *ch;
 494         struct mwifiex_adapter *adapter = priv->adapter;
 495         int chan_idx = 0, i;
 496
 497         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 498
 499                 if (!priv->wdev->wiphy->bands[band])
 500                         continue;
 501
 502                 sband = priv->wdev->wiphy->bands[band];
 503
 504                 for (i = 0; (i < sband->n_channels) ; i++) {
 505                         ch = &sband->channels[i];
 506                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 507                                 continue;
 508                         scan_chan_list[chan_idx].radio_type = band;
 509
 510                         if (user_scan_in &&
 511                             user_scan_in->chan_list[0].scan_time)
 512                                 scan_chan_list[chan_idx].max_scan_time =
 513                                         cpu_to_le16((u16) user_scan_in->
 514                                         chan_list[0].scan_time);
 515                         else if (ch->flags & IEEE80211_CHAN_NO_IR)
 516                                 scan_chan_list[chan_idx].max_scan_time =
 517                                         cpu_to_le16(adapter->passive_scan_time);
 518                         else
 519                                 scan_chan_list[chan_idx].max_scan_time =
 520                                         cpu_to_le16(adapter->active_scan_time);
 521
 522                         if (ch->flags & IEEE80211_CHAN_NO_IR)
 523                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 524                                         |= MWIFIEX_PASSIVE_SCAN;
 525                         else
 526                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 527                                         &= ~MWIFIEX_PASSIVE_SCAN;
 528                         scan_chan_list[chan_idx].chan_number =
 529                                                         (u32) ch->hw_value;
 530                         if (filtered_scan) {
 531                                 scan_chan_list[chan_idx].max_scan_time =
 532                                 cpu_to_le16(adapter->specific_scan_time);
 533                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 534                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 535                         }
 536                         chan_idx++;
 537                 }
 538
 539         }
 540         return chan_idx;
 541 }
 542
 543 /* This function appends rate TLV to scan config command. */
 544 static int
 545 mwifiex_append_rate_tlv(struct mwifiex_private *priv,
 546                         struct mwifiex_scan_cmd_config *scan_cfg_out,
 547                         u8 radio)
 548 {
 549         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 550         u8 rates[MWIFIEX_SUPPORTED_RATES], *tlv_pos;
 551         u32 rates_size;
 552
 553         memset(rates, 0, sizeof(rates));
 554
 555         tlv_pos = (u8 *)scan_cfg_out->tlv_buf + scan_cfg_out->tlv_buf_len;
 556
 557         if (priv->scan_request)
 558                 rates_size = mwifiex_get_rates_from_cfg80211(priv, rates,
 559                                                              radio);
 560         else
 561                 rates_size = mwifiex_get_supported_rates(priv, rates);
 562
 563         dev_dbg(priv->adapter->dev, "info: SCAN_CMD: Rates size = %d\n",
 564                 rates_size);
 565         rates_tlv = (struct mwifiex_ie_types_rates_param_set *)tlv_pos;
 566         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 567         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 568         memcpy(rates_tlv->rates, rates, rates_size);
 569         scan_cfg_out->tlv_buf_len += sizeof(rates_tlv->header) + rates_size;
 570
 571         return rates_size;
 572 }
 573
 574 /*
 575  * This function constructs and sends multiple scan config commands to
 576  * the firmware.
 577  *
 578  * Previous routines in the code flow have created a scan command configuration
 579  * with any requested TLVs.  This function splits the channel TLV into maximum
 580  * channels supported per scan lists and sends the portion of the channel TLV,
 581  * along with the other TLVs, to the firmware.
 582  */
 583 static int
 584 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 585                           u32 max_chan_per_scan, u8 filtered_scan,
 586                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 587                           struct mwifiex_ie_types_chan_list_param_set
 588                           *chan_tlv_out,
 589                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 590 {
 591         struct mwifiex_adapter *adapter = priv->adapter;
 592         int ret = 0;
 593         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 594         struct mwifiex_chan_scan_param_set *start_chan;
 595         struct cmd_ctrl_node *cmd_node, *tmp_node;
 596         unsigned long flags;
 597         u32 tlv_idx, rates_size, cmd_no;
 598         u32 total_scan_time;
 599         u32 done_early;
 600         u8 radio_type;
 601
 602         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 603                 dev_dbg(priv->adapter->dev,
 604                         "info: Scan: Null detect: %p, %p, %p\n",
 605                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 606                 return -1;
 607         }
 608
 609         /* Check csa channel expiry before preparing scan list */
 610         mwifiex_11h_get_csa_closed_channel(priv);
 611
 612         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 613
 614         /* Set the temp channel struct pointer to the start of the desired
 615            list */
 616         tmp_chan_list = scan_chan_list;
 617
 618         /* Loop through the desired channel list, sending a new firmware scan
 619            commands for each max_chan_per_scan channels (or for 1,6,11
 620            individually if configured accordingly) */
 621         while (tmp_chan_list->chan_number) {
 622
 623                 tlv_idx = 0;
 624                 total_scan_time = 0;
 625                 radio_type = 0;
 626                 chan_tlv_out->header.len = 0;
 627                 start_chan = tmp_chan_list;
 628                 done_early = false;
 629
 630                 /*
 631                  * Construct the Channel TLV for the scan command.  Continue to
 632                  * insert channel TLVs until:
 633                  *   - the tlv_idx hits the maximum configured per scan command
 634                  *   - the next channel to insert is 0 (end of desired channel
 635                  *     list)
 636                  *   - done_early is set (controlling individual scanning of
 637                  *     1,6,11)
 638                  */
 639                 while (tlv_idx < max_chan_per_scan &&
 640                        tmp_chan_list->chan_number && !done_early) {
 641
 642                         if (tmp_chan_list->chan_number == priv->csa_chan) {
 643                                 tmp_chan_list++;
 644                                 continue;
 645                         }
 646
 647                         radio_type = tmp_chan_list->radio_type;
 648                         dev_dbg(priv->adapter->dev,
 649                                 "info: Scan: Chan(%3d), Radio(%d),"
 650                                 " Mode(%d, %d), Dur(%d)\n",
 651                                 tmp_chan_list->chan_number,
 652                                 tmp_chan_list->radio_type,
 653                                 tmp_chan_list->chan_scan_mode_bitmap
 654                                 & MWIFIEX_PASSIVE_SCAN,
 655                                 (tmp_chan_list->chan_scan_mode_bitmap
 656                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 657                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 658
 659                         /* Copy the current channel TLV to the command being
 660                            prepared */
 661                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 662                                tmp_chan_list,
 663                                sizeof(chan_tlv_out->chan_scan_param));
 664
 665                         /* Increment the TLV header length by the size
 666                            appended */
 667                         le16_add_cpu(&chan_tlv_out->header.len,
 668                                      sizeof(chan_tlv_out->chan_scan_param));
 669
 670                         /*
 671                          * The tlv buffer length is set to the number of bytes
 672                          * of the between the channel tlv pointer and the start
 673                          * of the tlv buffer.  This compensates for any TLVs
 674                          * that were appended before the channel list.
 675                          */
 676                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 677                                                         scan_cfg_out->tlv_buf);
 678
 679                         /* Add the size of the channel tlv header and the data
 680                            length */
 681                         scan_cfg_out->tlv_buf_len +=
 682                                 (sizeof(chan_tlv_out->header)
 683                                  + le16_to_cpu(chan_tlv_out->header.len));
 684
 685                         /* Increment the index to the channel tlv we are
 686                            constructing */
 687                         tlv_idx++;
 688
 689                         /* Count the total scan time per command */
 690                         total_scan_time +=
 691                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 692
 693                         done_early = false;
 694
 695                         /* Stop the loop if the *current* channel is in the
 696                            1,6,11 set and we are not filtering on a BSSID
 697                            or SSID. */
 698                         if (!filtered_scan &&
 699                             (tmp_chan_list->chan_number == 1 ||
 700                              tmp_chan_list->chan_number == 6 ||
 701                              tmp_chan_list->chan_number == 11))
 702                                 done_early = true;
 703
 704                         /* Increment the tmp pointer to the next channel to
 705                            be scanned */
 706                         tmp_chan_list++;
 707
 708                         /* Stop the loop if the *next* channel is in the 1,6,11
 709                            set.  This will cause it to be the only channel
 710                            scanned on the next interation */
 711                         if (!filtered_scan &&
 712                             (tmp_chan_list->chan_number == 1 ||
 713                              tmp_chan_list->chan_number == 6 ||
 714                              tmp_chan_list->chan_number == 11))
 715                                 done_early = true;
 716                 }
 717
 718                 /* The total scan time should be less than scan command timeout
 719                    value */
 720                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 721                         dev_err(priv->adapter->dev, "total scan time %dms"
 722                                 " is over limit (%dms), scan skipped\n",
 723                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 724                         ret = -1;
 725                         break;
 726                 }
 727
 728                 rates_size = mwifiex_append_rate_tlv(priv, scan_cfg_out,
 729                                                      radio_type);
 730
 731                 priv->adapter->scan_channels = start_chan;
 732
 733                 /* Send the scan command to the firmware with the specified
 734                    cfg */
 735                 if (priv->adapter->ext_scan)
 736                         cmd_no = HostCmd_CMD_802_11_SCAN_EXT;
 737                 else
 738                         cmd_no = HostCmd_CMD_802_11_SCAN;
 739
 740                 ret = mwifiex_send_cmd(priv, cmd_no, HostCmd_ACT_GEN_SET,
 741                                        0, scan_cfg_out, false);
 742
 743                 /* rate IE is updated per scan command but same starting
 744                  * pointer is used each time so that rate IE from earlier
 745                  * scan_cfg_out->buf is overwritten with new one.
 746                  */
 747                 scan_cfg_out->tlv_buf_len -=
 748                             sizeof(struct mwifiex_ie_types_header) + rates_size;
 749
 750                 if (ret) {
 751                         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
 752                         list_for_each_entry_safe(cmd_node, tmp_node,
 753                                                  &adapter->scan_pending_q,
 754                                                  list) {
 755                                 list_del(&cmd_node->list);
 756                                 cmd_node->wait_q_enabled = false;
 757                                 mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
 758                         }
 759                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
 760                                                flags);
 761                         break;
 762                 }
 763         }
 764
 765         if (ret)
 766                 return -1;
 767
 768         return 0;
 769 }
 770
 771 /*
 772  * This function constructs a scan command configuration structure to use
 773  * in scan commands.
 774  *
 775  * Application layer or other functions can invoke network scanning
 776  * with a scan configuration supplied in a user scan configuration structure.
 777  * This structure is used as the basis of one or many scan command configuration
 778  * commands that are sent to the command processing module and eventually to the
 779  * firmware.
 780  *
 781  * This function creates a scan command configuration structure  based on the
 782  * following user supplied parameters (if present):
 783  *      - SSID filter
 784  *      - BSSID filter
 785  *      - Number of Probes to be sent
 786  *      - Channel list
 787  *
 788  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 789  * If the number of probes is not set, adapter default setting is used.
 790  */
 791 static void
 792 mwifiex_config_scan(struct mwifiex_private *priv,
 793                     const struct mwifiex_user_scan_cfg *user_scan_in,
 794                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 795                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 796                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 797                     u8 *max_chan_per_scan, u8 *filtered_scan,
 798                     u8 *scan_current_only)
 799 {
 800         struct mwifiex_adapter *adapter = priv->adapter;
 801         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 802         struct mwifiex_ie_types_scan_chan_gap *chan_gap_tlv;
 803         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 804         struct mwifiex_ie_types_bssid_list *bssid_tlv;
 805         u8 *tlv_pos;
 806         u32 num_probes;
 807         u32 ssid_len;
 808         u32 chan_idx;
 809         u32 chan_num;
 810         u32 scan_type;
 811         u16 scan_dur;
 812         u8 channel;
 813         u8 radio_type;
 814         int i;
 815         u8 ssid_filter;
 816         struct mwifiex_ie_types_htcap *ht_cap;
 817
 818         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 819            in this routine will be preserved since the routine that sends the
 820            command will append channelTLVs at *chan_list_out.  The difference
 821            between the *chan_list_out and the tlv_buf start will be used to
 822            calculate the size of anything we add in this routine. */
 823         scan_cfg_out->tlv_buf_len = 0;
 824
 825         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 826            so later routines know where channels can be added to the command
 827            buf */
 828         tlv_pos = scan_cfg_out->tlv_buf;
 829
 830         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 831            below if a SSID or BSSID filter is sent in the command */
 832         *filtered_scan = false;
 833
 834         /* Initialize the scan as not being only on the current channel.  If
 835            the channel list is customized, only contains one channel, and is
 836            the active channel, this is set true and data flow is not halted. */
 837         *scan_current_only = false;
 838
 839         if (user_scan_in) {
 840
 841                 /* Default the ssid_filter flag to TRUE, set false under
 842                    certain wildcard conditions and qualified by the existence
 843                    of an SSID list before marking the scan as filtered */
 844                 ssid_filter = true;
 845
 846                 /* Set the BSS type scan filter, use Adapter setting if
 847                    unset */
 848                 scan_cfg_out->bss_mode =
 849                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 850                          bss_mode : (u8) adapter->scan_mode);
 851
 852                 /* Set the number of probes to send, use Adapter setting
 853                    if unset */
 854                 num_probes =
 855                         (user_scan_in->num_probes ? user_scan_in->
 856                          num_probes : adapter->scan_probes);
 857
 858                 /*
 859                  * Set the BSSID filter to the incoming configuration,
 860                  * if non-zero.  If not set, it will remain disabled
 861                  * (all zeros).
 862                  */
 863                 memcpy(scan_cfg_out->specific_bssid,
 864                        user_scan_in->specific_bssid,
 865                        sizeof(scan_cfg_out->specific_bssid));
 866
 867                 if (adapter->ext_scan &&
 868                     !is_zero_ether_addr(scan_cfg_out->specific_bssid)) {
 869                         bssid_tlv =
 870                                 (struct mwifiex_ie_types_bssid_list *)tlv_pos;
 871                         bssid_tlv->header.type = cpu_to_le16(TLV_TYPE_BSSID);
 872                         bssid_tlv->header.len = cpu_to_le16(ETH_ALEN);
 873                         memcpy(bssid_tlv->bssid, user_scan_in->specific_bssid,
 874                                ETH_ALEN);
 875                         tlv_pos += sizeof(struct mwifiex_ie_types_bssid_list);
 876                 }
 877
 878                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 879                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 880
 881                         wildcard_ssid_tlv =
 882                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 883                                 tlv_pos;
 884                         wildcard_ssid_tlv->header.type =
 885                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 886                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 887                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 888                                                          max_ssid_length)));
 889
 890                         /*
 891                          * max_ssid_length = 0 tells firmware to perform
 892                          * specific scan for the SSID filled, whereas
 893                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 894                          * wildcard scan.
 895                          */
 896                         if (ssid_len)
 897                                 wildcard_ssid_tlv->max_ssid_length = 0;
 898                         else
 899                                 wildcard_ssid_tlv->max_ssid_length =
 900                                                         IEEE80211_MAX_SSID_LEN;
 901
 902                         memcpy(wildcard_ssid_tlv->ssid,
 903                                user_scan_in->ssid_list[i].ssid, ssid_len);
 904
 905                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 906                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 907
 908                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 909                                 i, wildcard_ssid_tlv->ssid,
 910                                 wildcard_ssid_tlv->max_ssid_length);
 911
 912                         /* Empty wildcard ssid with a maxlen will match many or
 913                            potentially all SSIDs (maxlen == 32), therefore do
 914                            not treat the scan as
 915                            filtered. */
 916                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 917                                 ssid_filter = false;
 918                 }
 919
 920                 /*
 921                  *  The default number of channels sent in the command is low to
 922                  *  ensure the response buffer from the firmware does not
 923                  *  truncate scan results.  That is not an issue with an SSID
 924                  *  or BSSID filter applied to the scan results in the firmware.
 925                  */
 926                 if ((i && ssid_filter) ||
 927                     !is_zero_ether_addr(scan_cfg_out->specific_bssid))
 928                         *filtered_scan = true;
 929
 930                 if (user_scan_in->scan_chan_gap) {
 931                         dev_dbg(adapter->dev, "info: scan: channel gap = %d\n",
 932                                 user_scan_in->scan_chan_gap);
 933                         *max_chan_per_scan =
 934                                         MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 935
 936                         chan_gap_tlv = (void *)tlv_pos;
 937                         chan_gap_tlv->header.type =
 938                                          cpu_to_le16(TLV_TYPE_SCAN_CHANNEL_GAP);
 939                         chan_gap_tlv->header.len =
 940                                     cpu_to_le16(sizeof(chan_gap_tlv->chan_gap));
 941                         chan_gap_tlv->chan_gap =
 942                                      cpu_to_le16((user_scan_in->scan_chan_gap));
 943                         tlv_pos +=
 944                                   sizeof(struct mwifiex_ie_types_scan_chan_gap);
 945                 }
 946         } else {
 947                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 948                 num_probes = adapter->scan_probes;
 949         }
 950
 951         /*
 952          *  If a specific BSSID or SSID is used, the number of channels in the
 953          *  scan command will be increased to the absolute maximum.
 954          */
 955         if (*filtered_scan)
 956                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 957         else
 958                 *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
 959
 960         /* If the input config or adapter has the number of Probes set,
 961            add tlv */
 962         if (num_probes) {
 963
 964                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 965                         num_probes);
 966
 967                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 968                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 969                 num_probes_tlv->header.len =
 970                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 971                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 972
 973                 tlv_pos += sizeof(num_probes_tlv->header) +
 974                         le16_to_cpu(num_probes_tlv->header.len);
 975
 976         }
 977
 978         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 979             (priv->adapter->config_bands & BAND_GN ||
 980              priv->adapter->config_bands & BAND_AN)) {
 981                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 982                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 983                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 984                 ht_cap->header.len =
 985                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 986                 radio_type =
 987                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 988                 mwifiex_fill_cap_info(priv, radio_type, &ht_cap->ht_cap);
 989                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 990         }
 991
 992         /* Append vendor specific IE TLV */
 993         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 994
 995         /*
 996          * Set the output for the channel TLV to the address in the tlv buffer
 997          *   past any TLVs that were added in this function (SSID, num_probes).
 998          *   Channel TLVs will be added past this for each scan command,
 999          *   preserving the TLVs that were previously added.
1000          */
1001         *chan_list_out =
1002                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
1003
1004         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
1005
1006                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
1007
1008                 for (chan_idx = 0;
1009                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
1010                      user_scan_in->chan_list[chan_idx].chan_number;
1011                      chan_idx++) {
1012
1013                         channel = user_scan_in->chan_list[chan_idx].chan_number;
1014                         (scan_chan_list + chan_idx)->chan_number = channel;
1015
1016                         radio_type =
1017                                 user_scan_in->chan_list[chan_idx].radio_type;
1018                         (scan_chan_list + chan_idx)->radio_type = radio_type;
1019
1020                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
1021
1022                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
1023                                 (scan_chan_list +
1024                                  chan_idx)->chan_scan_mode_bitmap
1025                                         |= MWIFIEX_PASSIVE_SCAN;
1026                         else
1027                                 (scan_chan_list +
1028                                  chan_idx)->chan_scan_mode_bitmap
1029                                         &= ~MWIFIEX_PASSIVE_SCAN;
1030
1031                         if (*filtered_scan)
1032                                 (scan_chan_list +
1033                                  chan_idx)->chan_scan_mode_bitmap
1034                                         |= MWIFIEX_DISABLE_CHAN_FILT;
1035
1036                         if (user_scan_in->chan_list[chan_idx].scan_time) {
1037                                 scan_dur = (u16) user_scan_in->
1038                                         chan_list[chan_idx].scan_time;
1039                         } else {
1040                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
1041                                         scan_dur = adapter->passive_scan_time;
1042                                 else if (*filtered_scan)
1043                                         scan_dur = adapter->specific_scan_time;
1044                                 else
1045                                         scan_dur = adapter->active_scan_time;
1046                         }
1047
1048                         (scan_chan_list + chan_idx)->min_scan_time =
1049                                 cpu_to_le16(scan_dur);
1050                         (scan_chan_list + chan_idx)->max_scan_time =
1051                                 cpu_to_le16(scan_dur);
1052                 }
1053
1054                 /* Check if we are only scanning the current channel */
1055                 if ((chan_idx == 1) &&
1056                     (user_scan_in->chan_list[0].chan_number ==
1057                      priv->curr_bss_params.bss_descriptor.channel)) {
1058                         *scan_current_only = true;
1059                         dev_dbg(adapter->dev,
1060                                 "info: Scan: Scanning current channel only\n");
1061                 }
1062                 chan_num = chan_idx;
1063         } else {
1064                 dev_dbg(adapter->dev,
1065                         "info: Scan: Creating full region channel list\n");
1066                 chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
1067                                                             scan_chan_list,
1068                                                             *filtered_scan);
1069         }
1070
1071 }
1072
1073 /*
1074  * This function inspects the scan response buffer for pointers to
1075  * expected TLVs.
1076  *
1077  * TLVs can be included at the end of the scan response BSS information.
1078  *
1079  * Data in the buffer is parsed pointers to TLVs that can potentially
1080  * be passed back in the response.
1081  */
1082 static void
1083 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1084                                      struct mwifiex_ie_types_data *tlv,
1085                                      u32 tlv_buf_size, u32 req_tlv_type,
1086                                      struct mwifiex_ie_types_data **tlv_data)
1087 {
1088         struct mwifiex_ie_types_data *current_tlv;
1089         u32 tlv_buf_left;
1090         u32 tlv_type;
1091         u32 tlv_len;
1092
1093         current_tlv = tlv;
1094         tlv_buf_left = tlv_buf_size;
1095         *tlv_data = NULL;
1096
1097         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1098                 tlv_buf_size);
1099
1100         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1101
1102                 tlv_type = le16_to_cpu(current_tlv->header.type);
1103                 tlv_len = le16_to_cpu(current_tlv->header.len);
1104
1105                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1106                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1107                         break;
1108                 }
1109
1110                 if (req_tlv_type == tlv_type) {
1111                         switch (tlv_type) {
1112                         case TLV_TYPE_TSFTIMESTAMP:
1113                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1114                                         "timestamp TLV, len = %d\n", tlv_len);
1115                                 *tlv_data = current_tlv;
1116                                 break;
1117                         case TLV_TYPE_CHANNELBANDLIST:
1118                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1119                                         " band list TLV, len = %d\n", tlv_len);
1120                                 *tlv_data = current_tlv;
1121                                 break;
1122                         default:
1123                                 dev_err(adapter->dev,
1124                                         "SCAN_RESP: unhandled TLV = %d\n",
1125                                        tlv_type);
1126                                 /* Give up, this seems corrupted */
1127                                 return;
1128                         }
1129                 }
1130
1131                 if (*tlv_data)
1132                         break;
1133
1134
1135                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1136                 current_tlv =
1137                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1138                                                           tlv_len);
1139
1140         }                       /* while */
1141 }
1142
1143 /*
1144  * This function parses provided beacon buffer and updates
1145  * respective fields in bss descriptor structure.
1146  */
1147 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1148                                     struct mwifiex_bssdescriptor *bss_entry)
1149 {
1150         int ret = 0;
1151         u8 element_id;
1152         struct ieee_types_fh_param_set *fh_param_set;
1153         struct ieee_types_ds_param_set *ds_param_set;
1154         struct ieee_types_cf_param_set *cf_param_set;
1155         struct ieee_types_ibss_param_set *ibss_param_set;
1156         u8 *current_ptr;
1157         u8 *rate;
1158         u8 element_len;
1159         u16 total_ie_len;
1160         u8 bytes_to_copy;
1161         u8 rate_size;
1162         u8 found_data_rate_ie;
1163         u32 bytes_left;
1164         struct ieee_types_vendor_specific *vendor_ie;
1165         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1166         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1167
1168         found_data_rate_ie = false;
1169         rate_size = 0;
1170         current_ptr = bss_entry->beacon_buf;
1171         bytes_left = bss_entry->beacon_buf_size;
1172
1173         /* Process variable IE */
1174         while (bytes_left >= 2) {
1175                 element_id = *current_ptr;
1176                 element_len = *(current_ptr + 1);
1177                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1178
1179                 if (bytes_left < total_ie_len) {
1180                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1181                                 " IE, bytes left < IE length\n");
1182                         return -1;
1183                 }
1184                 switch (element_id) {
1185                 case WLAN_EID_SSID:
1186                         bss_entry->ssid.ssid_len = element_len;
1187                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1188                                element_len);
1189                         dev_dbg(adapter->dev,
1190                                 "info: InterpretIE: ssid: %-32s\n",
1191                                 bss_entry->ssid.ssid);
1192                         break;
1193
1194                 case WLAN_EID_SUPP_RATES:
1195                         memcpy(bss_entry->data_rates, current_ptr + 2,
1196                                element_len);
1197                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1198                                element_len);
1199                         rate_size = element_len;
1200                         found_data_rate_ie = true;
1201                         break;
1202
1203                 case WLAN_EID_FH_PARAMS:
1204                         fh_param_set =
1205                                 (struct ieee_types_fh_param_set *) current_ptr;
1206                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1207                                fh_param_set,
1208                                sizeof(struct ieee_types_fh_param_set));
1209                         break;
1210
1211                 case WLAN_EID_DS_PARAMS:
1212                         ds_param_set =
1213                                 (struct ieee_types_ds_param_set *) current_ptr;
1214
1215                         bss_entry->channel = ds_param_set->current_chan;
1216
1217                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1218                                ds_param_set,
1219                                sizeof(struct ieee_types_ds_param_set));
1220                         break;
1221
1222                 case WLAN_EID_CF_PARAMS:
1223                         cf_param_set =
1224                                 (struct ieee_types_cf_param_set *) current_ptr;
1225                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1226                                cf_param_set,
1227                                sizeof(struct ieee_types_cf_param_set));
1228                         break;
1229
1230                 case WLAN_EID_IBSS_PARAMS:
1231                         ibss_param_set =
1232                                 (struct ieee_types_ibss_param_set *)
1233                                 current_ptr;
1234                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1235                                ibss_param_set,
1236                                sizeof(struct ieee_types_ibss_param_set));
1237                         break;
1238
1239                 case WLAN_EID_ERP_INFO:
1240                         bss_entry->erp_flags = *(current_ptr + 2);
1241                         break;
1242
1243                 case WLAN_EID_PWR_CONSTRAINT:
1244                         bss_entry->local_constraint = *(current_ptr + 2);
1245                         bss_entry->sensed_11h = true;
1246                         break;
1247
1248                 case WLAN_EID_CHANNEL_SWITCH:
1249                         bss_entry->chan_sw_ie_present = true;
1250                 case WLAN_EID_PWR_CAPABILITY:
1251                 case WLAN_EID_TPC_REPORT:
1252                 case WLAN_EID_QUIET:
1253                         bss_entry->sensed_11h = true;
1254                     break;
1255
1256                 case WLAN_EID_EXT_SUPP_RATES:
1257                         /*
1258                          * Only process extended supported rate
1259                          * if data rate is already found.
1260                          * Data rate IE should come before
1261                          * extended supported rate IE
1262                          */
1263                         if (found_data_rate_ie) {
1264                                 if ((element_len + rate_size) >
1265                                     MWIFIEX_SUPPORTED_RATES)
1266                                         bytes_to_copy =
1267                                                 (MWIFIEX_SUPPORTED_RATES -
1268                                                  rate_size);
1269                                 else
1270                                         bytes_to_copy = element_len;
1271
1272                                 rate = (u8 *) bss_entry->data_rates;
1273                                 rate += rate_size;
1274                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1275
1276                                 rate = (u8 *) bss_entry->supported_rates;
1277                                 rate += rate_size;
1278                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1279                         }
1280                         break;
1281
1282                 case WLAN_EID_VENDOR_SPECIFIC:
1283                         vendor_ie = (struct ieee_types_vendor_specific *)
1284                                         current_ptr;
1285
1286                         if (!memcmp
1287                             (vendor_ie->vend_hdr.oui, wpa_oui,
1288                              sizeof(wpa_oui))) {
1289                                 bss_entry->bcn_wpa_ie =
1290                                         (struct ieee_types_vendor_specific *)
1291                                         current_ptr;
1292                                 bss_entry->wpa_offset = (u16)
1293                                         (current_ptr - bss_entry->beacon_buf);
1294                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1295                                     sizeof(wmm_oui))) {
1296                                 if (total_ie_len ==
1297                                     sizeof(struct ieee_types_wmm_parameter) ||
1298                                     total_ie_len ==
1299                                     sizeof(struct ieee_types_wmm_info))
1300                                         /*
1301                                          * Only accept and copy the WMM IE if
1302                                          * it matches the size expected for the
1303                                          * WMM Info IE or the WMM Parameter IE.
1304                                          */
1305                                         memcpy((u8 *) &bss_entry->wmm_ie,
1306                                                current_ptr, total_ie_len);
1307                         }
1308                         break;
1309                 case WLAN_EID_RSN:
1310                         bss_entry->bcn_rsn_ie =
1311                                 (struct ieee_types_generic *) current_ptr;
1312                         bss_entry->rsn_offset = (u16) (current_ptr -
1313                                                         bss_entry->beacon_buf);
1314                         break;
1315                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1316                         bss_entry->bcn_wapi_ie =
1317                                 (struct ieee_types_generic *) current_ptr;
1318                         bss_entry->wapi_offset = (u16) (current_ptr -
1319                                                         bss_entry->beacon_buf);
1320                         break;
1321                 case WLAN_EID_HT_CAPABILITY:
1322                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1323                                         (current_ptr +
1324                                         sizeof(struct ieee_types_header));
1325                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1326                                         sizeof(struct ieee_types_header) -
1327                                         bss_entry->beacon_buf);
1328                         break;
1329                 case WLAN_EID_HT_OPERATION:
1330                         bss_entry->bcn_ht_oper =
1331                                 (struct ieee80211_ht_operation *)(current_ptr +
1332                                         sizeof(struct ieee_types_header));
1333                         bss_entry->ht_info_offset = (u16) (current_ptr +
1334                                         sizeof(struct ieee_types_header) -
1335                                         bss_entry->beacon_buf);
1336                         break;
1337                 case WLAN_EID_VHT_CAPABILITY:
1338                         bss_entry->disable_11ac = false;
1339                         bss_entry->bcn_vht_cap =
1340                                 (void *)(current_ptr +
1341                                          sizeof(struct ieee_types_header));
1342                         bss_entry->vht_cap_offset =
1343                                         (u16)((u8 *)bss_entry->bcn_vht_cap -
1344                                               bss_entry->beacon_buf);
1345                         break;
1346                 case WLAN_EID_VHT_OPERATION:
1347                         bss_entry->bcn_vht_oper =
1348                                 (void *)(current_ptr +
1349                                          sizeof(struct ieee_types_header));
1350                         bss_entry->vht_info_offset =
1351                                         (u16)((u8 *)bss_entry->bcn_vht_oper -
1352                                               bss_entry->beacon_buf);
1353                         break;
1354                 case WLAN_EID_BSS_COEX_2040:
1355                         bss_entry->bcn_bss_co_2040 = current_ptr;
1356                         bss_entry->bss_co_2040_offset =
1357                                 (u16) (current_ptr - bss_entry->beacon_buf);
1358                         break;
1359                 case WLAN_EID_EXT_CAPABILITY:
1360                         bss_entry->bcn_ext_cap = current_ptr;
1361                         bss_entry->ext_cap_offset =
1362                                 (u16) (current_ptr - bss_entry->beacon_buf);
1363                         break;
1364                 case WLAN_EID_OPMODE_NOTIF:
1365                         bss_entry->oper_mode = (void *)current_ptr;
1366                         bss_entry->oper_mode_offset =
1367                                         (u16)((u8 *)bss_entry->oper_mode -
1368                                               bss_entry->beacon_buf);
1369                         break;
1370                 default:
1371                         break;
1372                 }
1373
1374                 current_ptr += element_len + 2;
1375
1376                 /* Need to account for IE ID and IE Len */
1377                 bytes_left -= (element_len + 2);
1378
1379         }       /* while (bytes_left > 2) */
1380         return ret;
1381 }
1382
1383 /*
1384  * This function converts radio type scan parameter to a band configuration
1385  * to be used in join command.
1386  */
1387 static u8
1388 mwifiex_radio_type_to_band(u8 radio_type)
1389 {
1390         switch (radio_type) {
1391         case HostCmd_SCAN_RADIO_TYPE_A:
1392                 return BAND_A;
1393         case HostCmd_SCAN_RADIO_TYPE_BG:
1394         default:
1395                 return BAND_G;
1396         }
1397 }
1398
1399 /*
1400  * This is an internal function used to start a scan based on an input
1401  * configuration.
1402  *
1403  * This uses the input user scan configuration information when provided in
1404  * order to send the appropriate scan commands to firmware to populate or
1405  * update the internal driver scan table.
1406  */
1407 int mwifiex_scan_networks(struct mwifiex_private *priv,
1408                           const struct mwifiex_user_scan_cfg *user_scan_in)
1409 {
1410         int ret;
1411         struct mwifiex_adapter *adapter = priv->adapter;
1412         struct cmd_ctrl_node *cmd_node;
1413         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1414         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1415         struct mwifiex_chan_scan_param_set *scan_chan_list;
1416         u8 filtered_scan;
1417         u8 scan_current_chan_only;
1418         u8 max_chan_per_scan;
1419         unsigned long flags;
1420
1421         if (adapter->scan_processing) {
1422                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1423                 return -EBUSY;
1424         }
1425
1426         if (priv->scan_block) {
1427                 dev_err(adapter->dev,
1428                         "cmd: Scan is blocked during association...\n");
1429                 return -EBUSY;
1430         }
1431
1432         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1433         adapter->scan_processing = true;
1434         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1435
1436         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1437                                GFP_KERNEL);
1438         if (!scan_cfg_out) {
1439                 ret = -ENOMEM;
1440                 goto done;
1441         }
1442
1443         scan_chan_list = kcalloc(MWIFIEX_USER_SCAN_CHAN_MAX,
1444                                  sizeof(struct mwifiex_chan_scan_param_set),
1445                                  GFP_KERNEL);
1446         if (!scan_chan_list) {
1447                 kfree(scan_cfg_out);
1448                 ret = -ENOMEM;
1449                 goto done;
1450         }
1451
1452         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1453                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1454                             &filtered_scan, &scan_current_chan_only);
1455
1456         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1457                                         &scan_cfg_out->config, chan_list_out,
1458                                         scan_chan_list);
1459
1460         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1461         if (!ret) {
1462                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1463                 if (!list_empty(&adapter->scan_pending_q)) {
1464                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1465                                                     struct cmd_ctrl_node, list);
1466                         list_del(&cmd_node->list);
1467                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1468                                                flags);
1469                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1470                                                         true);
1471                         queue_work(adapter->workqueue, &adapter->main_work);
1472
1473                         /* Perform internal scan synchronously */
1474                         if (!priv->scan_request) {
1475                                 dev_dbg(adapter->dev, "wait internal scan\n");
1476                                 mwifiex_wait_queue_complete(adapter, cmd_node);
1477                         }
1478                 } else {
1479                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1480                                                flags);
1481                 }
1482         }
1483
1484         kfree(scan_cfg_out);
1485         kfree(scan_chan_list);
1486 done:
1487         if (ret) {
1488                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1489                 adapter->scan_processing = false;
1490                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1491         }
1492         return ret;
1493 }
1494
1495 /*
1496  * This function prepares a scan command to be sent to the firmware.
1497  *
1498  * This uses the scan command configuration sent to the command processing
1499  * module in command preparation stage to configure a scan command structure
1500  * to send to firmware.
1501  *
1502  * The fixed fields specifying the BSS type and BSSID filters as well as a
1503  * variable number/length of TLVs are sent in the command to firmware.
1504  *
1505  * Preparation also includes -
1506  *      - Setting command ID, and proper size
1507  *      - Ensuring correct endian-ness
1508  */
1509 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1510                             struct mwifiex_scan_cmd_config *scan_cfg)
1511 {
1512         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1513
1514         /* Set fixed field variables in scan command */
1515         scan_cmd->bss_mode = scan_cfg->bss_mode;
1516         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1517                sizeof(scan_cmd->bssid));
1518         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1519
1520         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1521
1522         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1523         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1524                                           + sizeof(scan_cmd->bssid)
1525                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1526
1527         return 0;
1528 }
1529
1530 /*
1531  * This function checks compatibility of requested network with current
1532  * driver settings.
1533  */
1534 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1535                                         struct mwifiex_bssdescriptor *bss_desc)
1536 {
1537         int ret = -1;
1538
1539         if (!bss_desc)
1540                 return -1;
1541
1542         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1543                              (u16) bss_desc->channel, 0))) {
1544                 switch (priv->bss_mode) {
1545                 case NL80211_IFTYPE_STATION:
1546                 case NL80211_IFTYPE_ADHOC:
1547                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1548                                                             priv->bss_mode);
1549                         if (ret)
1550                                 dev_err(priv->adapter->dev,
1551                                         "Incompatible network settings\n");
1552                         break;
1553                 default:
1554                         ret = 0;
1555                 }
1556         }
1557
1558         return ret;
1559 }
1560
1561 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1562                                           struct cfg80211_bss *bss)
1563 {
1564         struct mwifiex_bssdescriptor *bss_desc;
1565         int ret;
1566         unsigned long flags;
1567
1568         /* Allocate and fill new bss descriptor */
1569         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor), GFP_KERNEL);
1570         if (!bss_desc)
1571                 return -ENOMEM;
1572
1573         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1574         if (ret)
1575                 goto done;
1576
1577         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1578         if (ret)
1579                 goto done;
1580
1581         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1582         /* Make a copy of current BSSID descriptor */
1583         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1584                sizeof(priv->curr_bss_params.bss_descriptor));
1585
1586         /* The contents of beacon_ie will be copied to its own buffer
1587          * in mwifiex_save_curr_bcn()
1588          */
1589         mwifiex_save_curr_bcn(priv);
1590         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1591
1592 done:
1593         /* beacon_ie buffer was allocated in function
1594          * mwifiex_fill_new_bss_desc(). Free it now.
1595          */
1596         kfree(bss_desc->beacon_buf);
1597         kfree(bss_desc);
1598         return 0;
1599 }
1600
1601 static int
1602 mwifiex_parse_single_response_buf(struct mwifiex_private *priv, u8 **bss_info,
1603                                   u32 *bytes_left, u64 fw_tsf, u8 *radio_type,
1604                                   bool ext_scan, s32 rssi_val)
1605 {
1606         struct mwifiex_adapter *adapter = priv->adapter;
1607         struct mwifiex_chan_freq_power *cfp;
1608         struct cfg80211_bss *bss;
1609         u8 bssid[ETH_ALEN];
1610         s32 rssi;
1611         const u8 *ie_buf;
1612         size_t ie_len;
1613         u16 channel = 0;
1614         u16 beacon_size = 0;
1615         u32 curr_bcn_bytes;
1616         u32 freq;
1617         u16 beacon_period;
1618         u16 cap_info_bitmap;
1619         u8 *current_ptr;
1620         u64 timestamp;
1621         struct mwifiex_fixed_bcn_param *bcn_param;
1622         struct mwifiex_bss_priv *bss_priv;
1623
1624         if (*bytes_left >= sizeof(beacon_size)) {
1625                 /* Extract & convert beacon size from command buffer */
1626                 beacon_size = le16_to_cpu(*(__le16 *)(*bss_info));
1627                 *bytes_left -= sizeof(beacon_size);
1628                 *bss_info += sizeof(beacon_size);
1629         }
1630
1631         if (!beacon_size || beacon_size > *bytes_left) {
1632                 *bss_info += *bytes_left;
1633                 *bytes_left = 0;
1634                 return -EFAULT;
1635         }
1636
1637         /* Initialize the current working beacon pointer for this BSS
1638          * iteration
1639          */
1640         current_ptr = *bss_info;
1641
1642         /* Advance the return beacon pointer past the current beacon */
1643         *bss_info += beacon_size;
1644         *bytes_left -= beacon_size;
1645
1646         curr_bcn_bytes = beacon_size;
1647
1648         /* First 5 fields are bssid, RSSI(for legacy scan only),
1649          * time stamp, beacon interval, and capability information
1650          */
1651         if (curr_bcn_bytes < ETH_ALEN + sizeof(u8) +
1652             sizeof(struct mwifiex_fixed_bcn_param)) {
1653                 dev_err(adapter->dev, "InterpretIE: not enough bytes left\n");
1654                 return -EFAULT;
1655         }
1656
1657         memcpy(bssid, current_ptr, ETH_ALEN);
1658         current_ptr += ETH_ALEN;
1659         curr_bcn_bytes -= ETH_ALEN;
1660
1661         if (!ext_scan) {
1662                 rssi = (s32) *current_ptr;
1663                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1664                 current_ptr += sizeof(u8);
1665                 curr_bcn_bytes -= sizeof(u8);
1666                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1667         } else {
1668                 rssi = rssi_val;
1669         }
1670
1671         bcn_param = (struct mwifiex_fixed_bcn_param *)current_ptr;
1672         current_ptr += sizeof(*bcn_param);
1673         curr_bcn_bytes -= sizeof(*bcn_param);
1674
1675         timestamp = le64_to_cpu(bcn_param->timestamp);
1676         beacon_period = le16_to_cpu(bcn_param->beacon_period);
1677
1678         cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1679         dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1680                 cap_info_bitmap);
1681
1682         /* Rest of the current buffer are IE's */
1683         ie_buf = current_ptr;
1684         ie_len = curr_bcn_bytes;
1685         dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP = %d\n",
1686                 curr_bcn_bytes);
1687
1688         while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1689                 u8 element_id, element_len;
1690
1691                 element_id = *current_ptr;
1692                 element_len = *(current_ptr + 1);
1693                 if (curr_bcn_bytes < element_len +
1694                                 sizeof(struct ieee_types_header)) {
1695                         dev_err(adapter->dev,
1696                                 "%s: bytes left < IE length\n", __func__);
1697                         return -EFAULT;
1698                 }
1699                 if (element_id == WLAN_EID_DS_PARAMS) {
1700                         channel = *(current_ptr +
1701                                     sizeof(struct ieee_types_header));
1702                         break;
1703                 }
1704
1705                 current_ptr += element_len + sizeof(struct ieee_types_header);
1706                 curr_bcn_bytes -= element_len +
1707                                         sizeof(struct ieee_types_header);
1708         }
1709
1710         if (channel) {
1711                 struct ieee80211_channel *chan;
1712                 u8 band;
1713
1714                 /* Skip entry if on csa closed channel */
1715                 if (channel == priv->csa_chan) {
1716                         dev_dbg(adapter->dev,
1717                                 "Dropping entry on csa closed channel\n");
1718                         return 0;
1719                 }
1720
1721                 band = BAND_G;
1722                 if (radio_type)
1723                         band = mwifiex_radio_type_to_band(*radio_type &
1724                                                           (BIT(0) | BIT(1)));
1725
1726                 cfp = mwifiex_get_cfp(priv, band, channel, 0);
1727
1728                 freq = cfp ? cfp->freq : 0;
1729
1730                 chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1731
1732                 if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1733                         bss = cfg80211_inform_bss(priv->wdev->wiphy,
1734                                             chan, CFG80211_BSS_FTYPE_UNKNOWN,
1735                                             bssid, timestamp,
1736                                             cap_info_bitmap, beacon_period,
1737                                             ie_buf, ie_len, rssi, GFP_KERNEL);
1738                         bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1739                         bss_priv->band = band;
1740                         bss_priv->fw_tsf = fw_tsf;
1741                         if (priv->media_connected &&
1742                             !memcmp(bssid, priv->curr_bss_params.bss_descriptor
1743                                     .mac_address, ETH_ALEN))
1744                                 mwifiex_update_curr_bss_params(priv, bss);
1745                         cfg80211_put_bss(priv->wdev->wiphy, bss);
1746                 }
1747         } else {
1748                 dev_dbg(adapter->dev, "missing BSS channel IE\n");
1749         }
1750
1751         return 0;
1752 }
1753
1754 static void mwifiex_complete_scan(struct mwifiex_private *priv)
1755 {
1756         struct mwifiex_adapter *adapter = priv->adapter;
1757
1758         adapter->survey_idx = 0;
1759         if (adapter->curr_cmd->wait_q_enabled) {
1760                 adapter->cmd_wait_q.status = 0;
1761                 if (!priv->scan_request) {
1762                         dev_dbg(adapter->dev, "complete internal scan\n");
1763                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1764                 }
1765         }
1766 }
1767
1768 static void mwifiex_check_next_scan_command(struct mwifiex_private *priv)
1769 {
1770         struct mwifiex_adapter *adapter = priv->adapter;
1771         struct cmd_ctrl_node *cmd_node, *tmp_node;
1772         unsigned long flags;
1773
1774         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1775         if (list_empty(&adapter->scan_pending_q)) {
1776                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1777                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1778                 adapter->scan_processing = false;
1779                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1780
1781                 if (!adapter->ext_scan)
1782                         mwifiex_complete_scan(priv);
1783
1784                 if (priv->scan_request) {
1785                         dev_dbg(adapter->dev, "info: notifying scan done\n");
1786                         cfg80211_scan_done(priv->scan_request, 0);
1787                         priv->scan_request = NULL;
1788                 } else {
1789                         priv->scan_aborting = false;
1790                         dev_dbg(adapter->dev, "info: scan already aborted\n");
1791                 }
1792         } else if ((priv->scan_aborting && !priv->scan_request) ||
1793                    priv->scan_block) {
1794                 list_for_each_entry_safe(cmd_node, tmp_node,
1795                                          &adapter->scan_pending_q, list) {
1796                         list_del(&cmd_node->list);
1797                         mwifiex_insert_cmd_to_free_q(adapter, cmd_node);
1798                 }
1799                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1800
1801                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1802                 adapter->scan_processing = false;
1803                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1804
1805                 if (priv->scan_request) {
1806                         dev_dbg(adapter->dev, "info: aborting scan\n");
1807                         cfg80211_scan_done(priv->scan_request, 1);
1808                         priv->scan_request = NULL;
1809                 } else {
1810                         priv->scan_aborting = false;
1811                         dev_dbg(adapter->dev, "info: scan already aborted\n");
1812                 }
1813         } else {
1814                 /* Get scan command from scan_pending_q and put to
1815                  * cmd_pending_q
1816                  */
1817                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1818                                             struct cmd_ctrl_node, list);
1819                 list_del(&cmd_node->list);
1820                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1821                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1822         }
1823
1824         return;
1825 }
1826
1827 /*
1828  * This function handles the command response of scan.
1829  *
1830  * The response buffer for the scan command has the following
1831  * memory layout:
1832  *
1833  *      .-------------------------------------------------------------.
1834  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1835  *      .-------------------------------------------------------------.
1836  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1837  *      .-------------------------------------------------------------.
1838  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1839  *      .-------------------------------------------------------------.
1840  *      |  BSSDescription data (variable, size given in BufSize)      |
1841  *      .-------------------------------------------------------------.
1842  *      |  TLV data (variable, size calculated using Header->Size,    |
1843  *      |            BufSize and sizeof the fixed fields above)       |
1844  *      .-------------------------------------------------------------.
1845  */
1846 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1847                             struct host_cmd_ds_command *resp)
1848 {
1849         int ret = 0;
1850         struct mwifiex_adapter *adapter = priv->adapter;
1851         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1852         struct mwifiex_ie_types_data *tlv_data;
1853         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1854         u8 *bss_info;
1855         u32 scan_resp_size;
1856         u32 bytes_left;
1857         u32 idx;
1858         u32 tlv_buf_size;
1859         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1860         struct chan_band_param_set *chan_band;
1861         u8 is_bgscan_resp;
1862         __le64 fw_tsf = 0;
1863         u8 *radio_type;
1864
1865         is_bgscan_resp = (le16_to_cpu(resp->command)
1866                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1867         if (is_bgscan_resp)
1868                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1869         else
1870                 scan_rsp = &resp->params.scan_resp;
1871
1872
1873         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1874                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1875                         scan_rsp->number_of_sets);
1876                 ret = -1;
1877                 goto check_next_scan;
1878         }
1879
1880         /* Check csa channel expiry before parsing scan response */
1881         mwifiex_11h_get_csa_closed_channel(priv);
1882
1883         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1884         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1885                 bytes_left);
1886
1887         scan_resp_size = le16_to_cpu(resp->size);
1888
1889         dev_dbg(adapter->dev,
1890                 "info: SCAN_RESP: returned %d APs before parsing\n",
1891                 scan_rsp->number_of_sets);
1892
1893         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1894
1895         /*
1896          * The size of the TLV buffer is equal to the entire command response
1897          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1898          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1899          *   response header (S_DS_GEN)
1900          */
1901         tlv_buf_size = scan_resp_size - (bytes_left
1902                                          + sizeof(scan_rsp->bss_descript_size)
1903                                          + sizeof(scan_rsp->number_of_sets)
1904                                          + S_DS_GEN);
1905
1906         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1907                                                  bss_desc_and_tlv_buffer +
1908                                                  bytes_left);
1909
1910         /* Search the TLV buffer space in the scan response for any valid
1911            TLVs */
1912         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1913                                              TLV_TYPE_TSFTIMESTAMP,
1914                                              (struct mwifiex_ie_types_data **)
1915                                              &tsf_tlv);
1916
1917         /* Search the TLV buffer space in the scan response for any valid
1918            TLVs */
1919         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1920                                              TLV_TYPE_CHANNELBANDLIST,
1921                                              (struct mwifiex_ie_types_data **)
1922                                              &chan_band_tlv);
1923
1924         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1925                 /*
1926                  * If the TSF TLV was appended to the scan results, save this
1927                  * entry's TSF value in the fw_tsf field. It is the firmware's
1928                  * TSF value at the time the beacon or probe response was
1929                  * received.
1930                  */
1931                 if (tsf_tlv)
1932                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1933                                sizeof(fw_tsf));
1934
1935                 if (chan_band_tlv) {
1936                         chan_band = &chan_band_tlv->chan_band_param[idx];
1937                         radio_type = &chan_band->radio_type;
1938                 } else {
1939                         radio_type = NULL;
1940                 }
1941
1942                 ret = mwifiex_parse_single_response_buf(priv, &bss_info,
1943                                                         &bytes_left,
1944                                                         le64_to_cpu(fw_tsf),
1945                                                         radio_type, false, 0);
1946                 if (ret)
1947                         goto check_next_scan;
1948         }
1949
1950 check_next_scan:
1951         mwifiex_check_next_scan_command(priv);
1952         return ret;
1953 }
1954
1955 /*
1956  * This function prepares an extended scan command to be sent to the firmware
1957  *
1958  * This uses the scan command configuration sent to the command processing
1959  * module in command preparation stage to configure a extended scan command
1960  * structure to send to firmware.
1961  */
1962 int mwifiex_cmd_802_11_scan_ext(struct mwifiex_private *priv,
1963                                 struct host_cmd_ds_command *cmd,
1964                                 void *data_buf)
1965 {
1966         struct host_cmd_ds_802_11_scan_ext *ext_scan = &cmd->params.ext_scan;
1967         struct mwifiex_scan_cmd_config *scan_cfg = data_buf;
1968
1969         memcpy(ext_scan->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1970
1971         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN_EXT);
1972
1973         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1974         cmd->size = cpu_to_le16((u16)(sizeof(ext_scan->reserved)
1975                                       + scan_cfg->tlv_buf_len + S_DS_GEN));
1976
1977         return 0;
1978 }
1979
1980 static void
1981 mwifiex_update_chan_statistics(struct mwifiex_private *priv,
1982                                struct mwifiex_ietypes_chanstats *tlv_stat)
1983 {
1984         struct mwifiex_adapter *adapter = priv->adapter;
1985         u8 i, num_chan;
1986         struct mwifiex_fw_chan_stats *fw_chan_stats;
1987         struct mwifiex_chan_stats chan_stats;
1988
1989         fw_chan_stats = (void *)((u8 *)tlv_stat +
1990                               sizeof(struct mwifiex_ie_types_header));
1991         num_chan = le16_to_cpu(tlv_stat->header.len) /
1992                                               sizeof(struct mwifiex_chan_stats);
1993
1994         for (i = 0 ; i < num_chan; i++) {
1995                 chan_stats.chan_num = fw_chan_stats->chan_num;
1996                 chan_stats.bandcfg = fw_chan_stats->bandcfg;
1997                 chan_stats.flags = fw_chan_stats->flags;
1998                 chan_stats.noise = fw_chan_stats->noise;
1999                 chan_stats.total_bss = le16_to_cpu(fw_chan_stats->total_bss);
2000                 chan_stats.cca_scan_dur =
2001                                        le16_to_cpu(fw_chan_stats->cca_scan_dur);
2002                 chan_stats.cca_busy_dur =
2003                                        le16_to_cpu(fw_chan_stats->cca_busy_dur);
2004                 dev_dbg(adapter->dev,
2005                         "chan=%d, noise=%d, total_network=%d scan_duration=%d, busy_duration=%d\n",
2006                         chan_stats.chan_num,
2007                         chan_stats.noise,
2008                         chan_stats.total_bss,
2009                         chan_stats.cca_scan_dur,
2010                         chan_stats.cca_busy_dur);
2011                 memcpy(&adapter->chan_stats[adapter->survey_idx++], &chan_stats,
2012                        sizeof(struct mwifiex_chan_stats));
2013                 fw_chan_stats++;
2014         }
2015 }
2016
2017 /* This function handles the command response of extended scan */
2018 int mwifiex_ret_802_11_scan_ext(struct mwifiex_private *priv,
2019                                 struct host_cmd_ds_command *resp)
2020 {
2021         struct mwifiex_adapter *adapter = priv->adapter;
2022         struct host_cmd_ds_802_11_scan_ext *ext_scan_resp;
2023         struct mwifiex_ie_types_header *tlv;
2024         struct mwifiex_ietypes_chanstats *tlv_stat;
2025         u16 buf_left, type, len;
2026
2027         struct host_cmd_ds_command *cmd_ptr;
2028         struct cmd_ctrl_node *cmd_node;
2029         unsigned long cmd_flags, scan_flags;
2030         bool complete_scan = false;
2031
2032         dev_dbg(priv->adapter->dev, "info: EXT scan returns successfully\n");
2033
2034         ext_scan_resp = &resp->params.ext_scan;
2035
2036         tlv = (void *)ext_scan_resp->tlv_buffer;
2037         buf_left = le16_to_cpu(resp->size) - (sizeof(*ext_scan_resp) + S_DS_GEN
2038                                               - 1);
2039
2040         while (buf_left >= sizeof(struct mwifiex_ie_types_header)) {
2041                 type = le16_to_cpu(tlv->type);
2042                 len = le16_to_cpu(tlv->len);
2043
2044                 if (buf_left < (sizeof(struct mwifiex_ie_types_header) + len)) {
2045                         dev_err(adapter->dev,
2046                                 "error processing scan response TLVs");
2047                         break;
2048                 }
2049
2050                 switch (type) {
2051                 case TLV_TYPE_CHANNEL_STATS:
2052                         tlv_stat = (void *)tlv;
2053                         mwifiex_update_chan_statistics(priv, tlv_stat);
2054                         break;
2055                 default:
2056                         break;
2057                 }
2058
2059                 buf_left -= len + sizeof(struct mwifiex_ie_types_header);
2060                 tlv = (void *)((u8 *)tlv + len +
2061                                sizeof(struct mwifiex_ie_types_header));
2062         }
2063
2064         spin_lock_irqsave(&adapter->cmd_pending_q_lock, cmd_flags);
2065         spin_lock_irqsave(&adapter->scan_pending_q_lock, scan_flags);
2066         if (list_empty(&adapter->scan_pending_q)) {
2067                 complete_scan = true;
2068                 list_for_each_entry(cmd_node, &adapter->cmd_pending_q, list) {
2069                         cmd_ptr = (void *)cmd_node->cmd_skb->data;
2070                         if (le16_to_cpu(cmd_ptr->command) ==
2071                             HostCmd_CMD_802_11_SCAN_EXT) {
2072                                 dev_dbg(priv->adapter->dev,
2073                                         "Scan pending in command pending list");
2074                                 complete_scan = false;
2075                                 break;
2076                         }
2077                 }
2078         }
2079         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, scan_flags);
2080         spin_unlock_irqrestore(&adapter->cmd_pending_q_lock, cmd_flags);
2081
2082         if (complete_scan)
2083                 mwifiex_complete_scan(priv);
2084
2085         return 0;
2086 }
2087
2088 /* This function This function handles the event extended scan report. It
2089  * parses extended scan results and informs to cfg80211 stack.
2090  */
2091 int mwifiex_handle_event_ext_scan_report(struct mwifiex_private *priv,
2092                                          void *buf)
2093 {
2094         int ret = 0;
2095         struct mwifiex_adapter *adapter = priv->adapter;
2096         u8 *bss_info;
2097         u32 bytes_left, bytes_left_for_tlv, idx;
2098         u16 type, len;
2099         struct mwifiex_ie_types_data *tlv;
2100         struct mwifiex_ie_types_bss_scan_rsp *scan_rsp_tlv;
2101         struct mwifiex_ie_types_bss_scan_info *scan_info_tlv;
2102         u8 *radio_type;
2103         u64 fw_tsf = 0;
2104         s32 rssi = 0;
2105         struct mwifiex_event_scan_result *event_scan = buf;
2106         u8 num_of_set = event_scan->num_of_set;
2107         u8 *scan_resp = buf + sizeof(struct mwifiex_event_scan_result);
2108         u16 scan_resp_size = le16_to_cpu(event_scan->buf_size);
2109
2110         if (num_of_set > MWIFIEX_MAX_AP) {
2111                 dev_err(adapter->dev,
2112                         "EXT_SCAN: Invalid number of AP returned (%d)!!\n",
2113                         num_of_set);
2114                 ret = -1;
2115                 goto check_next_scan;
2116         }
2117
2118         bytes_left = scan_resp_size;
2119         dev_dbg(adapter->dev,
2120                 "EXT_SCAN: size %d, returned %d APs...",
2121                 scan_resp_size, num_of_set);
2122
2123         tlv = (struct mwifiex_ie_types_data *)scan_resp;
2124
2125         for (idx = 0; idx < num_of_set && bytes_left; idx++) {
2126                 type = le16_to_cpu(tlv->header.type);
2127                 len = le16_to_cpu(tlv->header.len);
2128                 if (bytes_left < sizeof(struct mwifiex_ie_types_header) + len) {
2129                         dev_err(adapter->dev, "EXT_SCAN: Error bytes left < TLV length\n");
2130                         break;
2131                 }
2132                 scan_rsp_tlv = NULL;
2133                 scan_info_tlv = NULL;
2134                 bytes_left_for_tlv = bytes_left;
2135
2136                 /* BSS response TLV with beacon or probe response buffer
2137                  * at the initial position of each descriptor
2138                  */
2139                 if (type != TLV_TYPE_BSS_SCAN_RSP)
2140                         break;
2141
2142                 bss_info = (u8 *)tlv;
2143                 scan_rsp_tlv = (struct mwifiex_ie_types_bss_scan_rsp *)tlv;
2144                 tlv = (struct mwifiex_ie_types_data *)(tlv->data + len);
2145                 bytes_left_for_tlv -=
2146                                 (len + sizeof(struct mwifiex_ie_types_header));
2147
2148                 while (bytes_left_for_tlv >=
2149                        sizeof(struct mwifiex_ie_types_header) &&
2150                        le16_to_cpu(tlv->header.type) != TLV_TYPE_BSS_SCAN_RSP) {
2151                         type = le16_to_cpu(tlv->header.type);
2152                         len = le16_to_cpu(tlv->header.len);
2153                         if (bytes_left_for_tlv <
2154                             sizeof(struct mwifiex_ie_types_header) + len) {
2155                                 dev_err(adapter->dev,
2156                                         "EXT_SCAN: Error in processing TLV, bytes left < TLV length\n");
2157                                 scan_rsp_tlv = NULL;
2158                                 bytes_left_for_tlv = 0;
2159                                 continue;
2160                         }
2161                         switch (type) {
2162                         case TLV_TYPE_BSS_SCAN_INFO:
2163                                 scan_info_tlv =
2164                                   (struct mwifiex_ie_types_bss_scan_info *)tlv;
2165                                 if (len !=
2166                                  sizeof(struct mwifiex_ie_types_bss_scan_info) -
2167                                  sizeof(struct mwifiex_ie_types_header)) {
2168                                         bytes_left_for_tlv = 0;
2169                                         continue;
2170                                 }
2171                                 break;
2172                         default:
2173                                 break;
2174                         }
2175                         tlv = (struct mwifiex_ie_types_data *)(tlv->data + len);
2176                         bytes_left -=
2177                                 (len + sizeof(struct mwifiex_ie_types_header));
2178                         bytes_left_for_tlv -=
2179                                 (len + sizeof(struct mwifiex_ie_types_header));
2180                 }
2181
2182                 if (!scan_rsp_tlv)
2183                         break;
2184
2185                 /* Advance pointer to the beacon buffer length and
2186                  * update the bytes count so that the function
2187                  * wlan_interpret_bss_desc_with_ie() can handle the
2188                  * scan buffer withut any change
2189                  */
2190                 bss_info += sizeof(u16);
2191                 bytes_left -= sizeof(u16);
2192
2193                 if (scan_info_tlv) {
2194                         rssi = (s32)(s16)(le16_to_cpu(scan_info_tlv->rssi));
2195                         rssi *= 100;           /* Convert dBm to mBm */
2196                         dev_dbg(adapter->dev,
2197                                 "info: InterpretIE: RSSI=%d\n", rssi);
2198                         fw_tsf = le64_to_cpu(scan_info_tlv->tsf);
2199                         radio_type = &scan_info_tlv->radio_type;
2200                 } else {
2201                         radio_type = NULL;
2202                 }
2203                 ret = mwifiex_parse_single_response_buf(priv, &bss_info,
2204                                                         &bytes_left, fw_tsf,
2205                                                         radio_type, true, rssi);
2206                 if (ret)
2207                         goto check_next_scan;
2208         }
2209
2210 check_next_scan:
2211         if (!event_scan->more_event)
2212                 mwifiex_check_next_scan_command(priv);
2213
2214         return ret;
2215 }
2216
2217 /*
2218  * This function prepares command for background scan query.
2219  *
2220  * Preparation includes -
2221  *      - Setting command ID and proper size
2222  *      - Setting background scan flush parameter
2223  *      - Ensuring correct endian-ness
2224  */
2225 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
2226 {
2227         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
2228                 &cmd->params.bg_scan_query;
2229
2230         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
2231         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
2232                                 + S_DS_GEN);
2233
2234         bg_query->flush = 1;
2235
2236         return 0;
2237 }
2238
2239 /*
2240  * This function inserts scan command node to the scan pending queue.
2241  */
2242 void
2243 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
2244                        struct cmd_ctrl_node *cmd_node)
2245 {
2246         struct mwifiex_adapter *adapter = priv->adapter;
2247         unsigned long flags;
2248
2249         cmd_node->wait_q_enabled = true;
2250         cmd_node->condition = &adapter->scan_wait_q_woken;
2251         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
2252         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
2253         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
2254 }
2255
2256 /*
2257  * This function sends a scan command for all available channels to the
2258  * firmware, filtered on a specific SSID.
2259  */
2260 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
2261                                       struct cfg80211_ssid *req_ssid)
2262 {
2263         struct mwifiex_adapter *adapter = priv->adapter;
2264         int ret;
2265         struct mwifiex_user_scan_cfg *scan_cfg;
2266
2267         if (adapter->scan_processing) {
2268                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
2269                 return -EBUSY;
2270         }
2271
2272         if (priv->scan_block) {
2273                 dev_err(adapter->dev,
2274                         "cmd: Scan is blocked during association...\n");
2275                 return -EBUSY;
2276         }
2277
2278         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
2279         if (!scan_cfg)
2280                 return -ENOMEM;
2281
2282         scan_cfg->ssid_list = req_ssid;
2283         scan_cfg->num_ssids = 1;
2284
2285         ret = mwifiex_scan_networks(priv, scan_cfg);
2286
2287         kfree(scan_cfg);
2288         return ret;
2289 }
2290
2291 /*
2292  * Sends IOCTL request to start a scan.
2293  *
2294  * This function allocates the IOCTL request buffer, fills it
2295  * with requisite parameters and calls the IOCTL handler.
2296  *
2297  * Scan command can be issued for both normal scan and specific SSID
2298  * scan, depending upon whether an SSID is provided or not.
2299  */
2300 int mwifiex_request_scan(struct mwifiex_private *priv,
2301                          struct cfg80211_ssid *req_ssid)
2302 {
2303         int ret;
2304
2305         if (down_interruptible(&priv->async_sem)) {
2306                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
2307                         __func__);
2308                 return -1;
2309         }
2310
2311         priv->adapter->scan_wait_q_woken = false;
2312
2313         if (req_ssid && req_ssid->ssid_len != 0)
2314                 /* Specific SSID scan */
2315                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
2316         else
2317                 /* Normal scan */
2318                 ret = mwifiex_scan_networks(priv, NULL);
2319
2320         up(&priv->async_sem);
2321
2322         return ret;
2323 }
2324
2325 /*
2326  * This function appends the vendor specific IE TLV to a buffer.
2327  */
2328 int
2329 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
2330                             u16 vsie_mask, u8 **buffer)
2331 {
2332         int id, ret_len = 0;
2333         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
2334
2335         if (!buffer)
2336                 return 0;
2337         if (!(*buffer))
2338                 return 0;
2339
2340         /*
2341          * Traverse through the saved vendor specific IE array and append
2342          * the selected(scan/assoc/adhoc) IE as TLV to the command
2343          */
2344         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
2345                 if (priv->vs_ie[id].mask & vsie_mask) {
2346                         vs_param_set =
2347                                 (struct mwifiex_ie_types_vendor_param_set *)
2348                                 *buffer;
2349                         vs_param_set->header.type =
2350                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
2351                         vs_param_set->header.len =
2352                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
2353                                 & 0x00FF) + 2);
2354                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
2355                                le16_to_cpu(vs_param_set->header.len));
2356                         *buffer += le16_to_cpu(vs_param_set->header.len) +
2357                                    sizeof(struct mwifiex_ie_types_header);
2358                         ret_len += le16_to_cpu(vs_param_set->header.len) +
2359                                    sizeof(struct mwifiex_ie_types_header);
2360                 }
2361         }
2362         return ret_len;
2363 }
2364
2365 /*
2366  * This function saves a beacon buffer of the current BSS descriptor.
2367  *
2368  * The current beacon buffer is saved so that it can be restored in the
2369  * following cases that makes the beacon buffer not to contain the current
2370  * ssid's beacon buffer.
2371  *      - The current ssid was not found somehow in the last scan.
2372  *      - The current ssid was the last entry of the scan table and overloaded.
2373  */
2374 void
2375 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
2376 {
2377         struct mwifiex_bssdescriptor *curr_bss =
2378                 &priv->curr_bss_params.bss_descriptor;
2379
2380         if (!curr_bss->beacon_buf_size)
2381                 return;
2382
2383         /* allocate beacon buffer at 1st time; or if it's size has changed */
2384         if (!priv->curr_bcn_buf ||
2385             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
2386                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
2387
2388                 kfree(priv->curr_bcn_buf);
2389                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
2390                                              GFP_ATOMIC);
2391                 if (!priv->curr_bcn_buf)
2392                         return;
2393         }
2394
2395         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2396                curr_bss->beacon_buf_size);
2397         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2398                 priv->curr_bcn_size);
2399
2400         curr_bss->beacon_buf = priv->curr_bcn_buf;
2401
2402         /* adjust the pointers in the current BSS descriptor */
2403         if (curr_bss->bcn_wpa_ie)
2404                 curr_bss->bcn_wpa_ie =
2405                         (struct ieee_types_vendor_specific *)
2406                         (curr_bss->beacon_buf +
2407                          curr_bss->wpa_offset);
2408
2409         if (curr_bss->bcn_rsn_ie)
2410                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2411                         (curr_bss->beacon_buf +
2412                          curr_bss->rsn_offset);
2413
2414         if (curr_bss->bcn_ht_cap)
2415                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2416                         (curr_bss->beacon_buf +
2417                          curr_bss->ht_cap_offset);
2418
2419         if (curr_bss->bcn_ht_oper)
2420                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2421                         (curr_bss->beacon_buf +
2422                          curr_bss->ht_info_offset);
2423
2424         if (curr_bss->bcn_vht_cap)
2425                 curr_bss->bcn_vht_cap = (void *)(curr_bss->beacon_buf +
2426                                                  curr_bss->vht_cap_offset);
2427
2428         if (curr_bss->bcn_vht_oper)
2429                 curr_bss->bcn_vht_oper = (void *)(curr_bss->beacon_buf +
2430                                                   curr_bss->vht_info_offset);
2431
2432         if (curr_bss->bcn_bss_co_2040)
2433                 curr_bss->bcn_bss_co_2040 =
2434                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2435
2436         if (curr_bss->bcn_ext_cap)
2437                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2438                         curr_bss->ext_cap_offset;
2439
2440         if (curr_bss->oper_mode)
2441                 curr_bss->oper_mode = (void *)(curr_bss->beacon_buf +
2442                                                curr_bss->oper_mode_offset);
2443 }
2444
2445 /*
2446  * This function frees the current BSS descriptor beacon buffer.
2447  */
2448 void
2449 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2450 {
2451         kfree(priv->curr_bcn_buf);
2452         priv->curr_bcn_buf = NULL;
2453 }