drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_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_WPA))) {
 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_WPA)) &&
 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)).vend_hdr.element_id == WLAN_EID_WPA))
 238            /*
 239             * Privacy bit may NOT be set in some APs like
 240             * LinkSys WRT54G && bss_desc->privacy
 241             */
 242          ) {
 243                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 244                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 245                         "EncMode=%#x privacy=%#x\n", __func__,
 246                         (bss_desc->bcn_wpa_ie) ?
 247                         (*(bss_desc->bcn_wpa_ie)).
 248                         vend_hdr.element_id : 0,
 249                         (bss_desc->bcn_rsn_ie) ?
 250                         (*(bss_desc->bcn_rsn_ie)).
 251                         ieee_hdr.element_id : 0,
 252                         (priv->sec_info.wep_enabled) ? "e" : "d",
 253                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 254                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 255                         priv->sec_info.encryption_mode,
 256                         bss_desc->privacy);
 257                 return true;
 258         }
 259         return false;
 260 }
 261
 262 /*
 263  * This function checks if wpa2 is enabled in driver and scanned network is
 264  * compatible with it.
 265  */
 266 static bool
 267 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 268                     struct mwifiex_bssdescriptor *bss_desc)
 269 {
 270         if (!priv->sec_info.wep_enabled &&
 271             !priv->sec_info.wpa_enabled &&
 272             priv->sec_info.wpa2_enabled &&
 273             ((bss_desc->bcn_rsn_ie) &&
 274              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 275                 /*
 276                  * Privacy bit may NOT be set in some APs like
 277                  * LinkSys WRT54G && bss_desc->privacy
 278                  */
 279                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 280                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 281                         "EncMode=%#x privacy=%#x\n", __func__,
 282                         (bss_desc->bcn_wpa_ie) ?
 283                         (*(bss_desc->bcn_wpa_ie)).
 284                         vend_hdr.element_id : 0,
 285                         (bss_desc->bcn_rsn_ie) ?
 286                         (*(bss_desc->bcn_rsn_ie)).
 287                         ieee_hdr.element_id : 0,
 288                         (priv->sec_info.wep_enabled) ? "e" : "d",
 289                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 290                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 291                         priv->sec_info.encryption_mode,
 292                         bss_desc->privacy);
 293                 return true;
 294         }
 295         return false;
 296 }
 297
 298 /*
 299  * This function checks if adhoc AES is enabled in driver and scanned network is
 300  * compatible with it.
 301  */
 302 static bool
 303 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 304                          struct mwifiex_bssdescriptor *bss_desc)
 305 {
 306         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 307             !priv->sec_info.wpa2_enabled &&
 308             ((!bss_desc->bcn_wpa_ie) ||
 309              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 310             ((!bss_desc->bcn_rsn_ie) ||
 311              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 312             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 313                 return true;
 314         }
 315         return false;
 316 }
 317
 318 /*
 319  * This function checks if dynamic WEP is enabled in driver and scanned network
 320  * is compatible with it.
 321  */
 322 static bool
 323 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 324                            struct mwifiex_bssdescriptor *bss_desc)
 325 {
 326         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 327             !priv->sec_info.wpa2_enabled &&
 328             ((!bss_desc->bcn_wpa_ie) ||
 329              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 330             ((!bss_desc->bcn_rsn_ie) ||
 331              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 332             priv->sec_info.encryption_mode && bss_desc->privacy) {
 333                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 334                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 335                         "EncMode=%#x privacy=%#x\n",
 336                         __func__,
 337                         (bss_desc->bcn_wpa_ie) ?
 338                         (*(bss_desc->bcn_wpa_ie)).
 339                         vend_hdr.element_id : 0,
 340                         (bss_desc->bcn_rsn_ie) ?
 341                         (*(bss_desc->bcn_rsn_ie)).
 342                         ieee_hdr.element_id : 0,
 343                         priv->sec_info.encryption_mode,
 344                         bss_desc->privacy);
 345                 return true;
 346         }
 347         return false;
 348 }
 349
 350 /*
 351  * This function checks if a scanned network is compatible with the driver
 352  * settings.
 353  *
 354  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 355  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 356  *    0       0       0      0     NONE      0     0   0   yes No security
 357  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 358  *                                                         HT if no AES)
 359  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 360  *                                                         HT if no AES)
 361  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 362  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 363  *                                                         (disable HT)
 364  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 365  *
 366  * Compatibility is not matched while roaming, except for mode.
 367  */
 368 static s32
 369 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 370                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 371 {
 372         struct mwifiex_adapter *adapter = priv->adapter;
 373
 374         bss_desc->disable_11n = false;
 375
 376         /* Don't check for compatibility if roaming */
 377         if (priv->media_connected &&
 378             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 379             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 380                 return 0;
 381
 382         if (priv->wps.session_enable) {
 383                 dev_dbg(adapter->dev,
 384                         "info: return success directly in WPS period\n");
 385                 return 0;
 386         }
 387
 388         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 389                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 390                 return 0;
 391         }
 392
 393         if (bss_desc->bss_mode == mode) {
 394                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 395                         /* No security */
 396                         return 0;
 397                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 398                         /* Static WEP enabled */
 399                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 400                         bss_desc->disable_11n = true;
 401                         return 0;
 402                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 403                         /* WPA enabled */
 404                         if (((priv->adapter->config_bands & BAND_GN ||
 405                               priv->adapter->config_bands & BAND_AN) &&
 406                              bss_desc->bcn_ht_cap) &&
 407                             !mwifiex_is_wpa_oui_present(bss_desc,
 408                                                          CIPHER_SUITE_CCMP)) {
 409
 410                                 if (mwifiex_is_wpa_oui_present
 411                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 412                                         dev_dbg(adapter->dev,
 413                                                 "info: Disable 11n if AES "
 414                                                 "is not supported by AP\n");
 415                                         bss_desc->disable_11n = true;
 416                                 } else {
 417                                         return -1;
 418                                 }
 419                         }
 420                         return 0;
 421                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 422                         /* WPA2 enabled */
 423                         if (((priv->adapter->config_bands & BAND_GN ||
 424                               priv->adapter->config_bands & BAND_AN) &&
 425                              bss_desc->bcn_ht_cap) &&
 426                             !mwifiex_is_rsn_oui_present(bss_desc,
 427                                                         CIPHER_SUITE_CCMP)) {
 428
 429                                 if (mwifiex_is_rsn_oui_present
 430                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 431                                         dev_dbg(adapter->dev,
 432                                                 "info: Disable 11n if AES "
 433                                                 "is not supported by AP\n");
 434                                         bss_desc->disable_11n = true;
 435                                 } else {
 436                                         return -1;
 437                                 }
 438                         }
 439                         return 0;
 440                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 441                         /* Ad-hoc AES enabled */
 442                         return 0;
 443                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 444                         /* Dynamic WEP enabled */
 445                         return 0;
 446                 }
 447
 448                 /* Security doesn't match */
 449                 dev_dbg(adapter->dev,
 450                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 451                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 452                         (bss_desc->bcn_wpa_ie) ?
 453                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 454                         (bss_desc->bcn_rsn_ie) ?
 455                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 456                         (priv->sec_info.wep_enabled) ? "e" : "d",
 457                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 458                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 459                         priv->sec_info.encryption_mode, bss_desc->privacy);
 460                 return -1;
 461         }
 462
 463         /* Mode doesn't match */
 464         return -1;
 465 }
 466
 467 /*
 468  * This function creates a channel list for the driver to scan, based
 469  * on region/band information.
 470  *
 471  * This routine is used for any scan that is not provided with a
 472  * specific channel list to scan.
 473  */
 474 static void
 475 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 476                                  const struct mwifiex_user_scan_cfg
 477                                                         *user_scan_in,
 478                                  struct mwifiex_chan_scan_param_set
 479                                                         *scan_chan_list,
 480                                  u8 filtered_scan)
 481 {
 482         enum ieee80211_band band;
 483         struct ieee80211_supported_band *sband;
 484         struct ieee80211_channel *ch;
 485         struct mwifiex_adapter *adapter = priv->adapter;
 486         int chan_idx = 0, i;
 487
 488         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 489
 490                 if (!priv->wdev->wiphy->bands[band])
 491                         continue;
 492
 493                 sband = priv->wdev->wiphy->bands[band];
 494
 495                 for (i = 0; (i < sband->n_channels) ; i++) {
 496                         ch = &sband->channels[i];
 497                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 498                                 continue;
 499                         scan_chan_list[chan_idx].radio_type = band;
 500
 501                         if (user_scan_in &&
 502                             user_scan_in->chan_list[0].scan_time)
 503                                 scan_chan_list[chan_idx].max_scan_time =
 504                                         cpu_to_le16((u16) user_scan_in->
 505                                         chan_list[0].scan_time);
 506                         else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 507                                 scan_chan_list[chan_idx].max_scan_time =
 508                                         cpu_to_le16(adapter->passive_scan_time);
 509                         else
 510                                 scan_chan_list[chan_idx].max_scan_time =
 511                                         cpu_to_le16(adapter->active_scan_time);
 512
 513                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 514                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 515                                         |= MWIFIEX_PASSIVE_SCAN;
 516                         else
 517                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 518                                         &= ~MWIFIEX_PASSIVE_SCAN;
 519                         scan_chan_list[chan_idx].chan_number =
 520                                                         (u32) ch->hw_value;
 521                         if (filtered_scan) {
 522                                 scan_chan_list[chan_idx].max_scan_time =
 523                                 cpu_to_le16(adapter->specific_scan_time);
 524                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 525                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 526                         }
 527                         chan_idx++;
 528                 }
 529
 530         }
 531 }
 532
 533 /*
 534  * This function constructs and sends multiple scan config commands to
 535  * the firmware.
 536  *
 537  * Previous routines in the code flow have created a scan command configuration
 538  * with any requested TLVs.  This function splits the channel TLV into maximum
 539  * channels supported per scan lists and sends the portion of the channel TLV,
 540  * along with the other TLVs, to the firmware.
 541  */
 542 static int
 543 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 544                           u32 max_chan_per_scan, u8 filtered_scan,
 545                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 546                           struct mwifiex_ie_types_chan_list_param_set
 547                           *chan_tlv_out,
 548                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 549 {
 550         int ret = 0;
 551         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 552         struct mwifiex_chan_scan_param_set *start_chan;
 553
 554         u32 tlv_idx;
 555         u32 total_scan_time;
 556         u32 done_early;
 557
 558         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 559                 dev_dbg(priv->adapter->dev,
 560                         "info: Scan: Null detect: %p, %p, %p\n",
 561                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 562                 return -1;
 563         }
 564
 565         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 566
 567         /* Set the temp channel struct pointer to the start of the desired
 568            list */
 569         tmp_chan_list = scan_chan_list;
 570
 571         /* Loop through the desired channel list, sending a new firmware scan
 572            commands for each max_chan_per_scan channels (or for 1,6,11
 573            individually if configured accordingly) */
 574         while (tmp_chan_list->chan_number) {
 575
 576                 tlv_idx = 0;
 577                 total_scan_time = 0;
 578                 chan_tlv_out->header.len = 0;
 579                 start_chan = tmp_chan_list;
 580                 done_early = false;
 581
 582                 /*
 583                  * Construct the Channel TLV for the scan command.  Continue to
 584                  * insert channel TLVs until:
 585                  *   - the tlv_idx hits the maximum configured per scan command
 586                  *   - the next channel to insert is 0 (end of desired channel
 587                  *     list)
 588                  *   - done_early is set (controlling individual scanning of
 589                  *     1,6,11)
 590                  */
 591                 while (tlv_idx < max_chan_per_scan &&
 592                        tmp_chan_list->chan_number && !done_early) {
 593
 594                         dev_dbg(priv->adapter->dev,
 595                                 "info: Scan: Chan(%3d), Radio(%d),"
 596                                 " Mode(%d, %d), Dur(%d)\n",
 597                                 tmp_chan_list->chan_number,
 598                                 tmp_chan_list->radio_type,
 599                                 tmp_chan_list->chan_scan_mode_bitmap
 600                                 & MWIFIEX_PASSIVE_SCAN,
 601                                 (tmp_chan_list->chan_scan_mode_bitmap
 602                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 603                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 604
 605                         /* Copy the current channel TLV to the command being
 606                            prepared */
 607                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 608                                tmp_chan_list,
 609                                sizeof(chan_tlv_out->chan_scan_param));
 610
 611                         /* Increment the TLV header length by the size
 612                            appended */
 613                         chan_tlv_out->header.len =
 614                         cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
 615                         (sizeof(chan_tlv_out->chan_scan_param)));
 616
 617                         /*
 618                          * The tlv buffer length is set to the number of bytes
 619                          * of the between the channel tlv pointer and the start
 620                          * of the tlv buffer.  This compensates for any TLVs
 621                          * that were appended before the channel list.
 622                          */
 623                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 624                                                         scan_cfg_out->tlv_buf);
 625
 626                         /* Add the size of the channel tlv header and the data
 627                            length */
 628                         scan_cfg_out->tlv_buf_len +=
 629                                 (sizeof(chan_tlv_out->header)
 630                                  + le16_to_cpu(chan_tlv_out->header.len));
 631
 632                         /* Increment the index to the channel tlv we are
 633                            constructing */
 634                         tlv_idx++;
 635
 636                         /* Count the total scan time per command */
 637                         total_scan_time +=
 638                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 639
 640                         done_early = false;
 641
 642                         /* Stop the loop if the *current* channel is in the
 643                            1,6,11 set and we are not filtering on a BSSID
 644                            or SSID. */
 645                         if (!filtered_scan &&
 646                             (tmp_chan_list->chan_number == 1 ||
 647                              tmp_chan_list->chan_number == 6 ||
 648                              tmp_chan_list->chan_number == 11))
 649                                 done_early = true;
 650
 651                         /* Increment the tmp pointer to the next channel to
 652                            be scanned */
 653                         tmp_chan_list++;
 654
 655                         /* Stop the loop if the *next* channel is in the 1,6,11
 656                            set.  This will cause it to be the only channel
 657                            scanned on the next interation */
 658                         if (!filtered_scan &&
 659                             (tmp_chan_list->chan_number == 1 ||
 660                              tmp_chan_list->chan_number == 6 ||
 661                              tmp_chan_list->chan_number == 11))
 662                                 done_early = true;
 663                 }
 664
 665                 /* The total scan time should be less than scan command timeout
 666                    value */
 667                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 668                         dev_err(priv->adapter->dev, "total scan time %dms"
 669                                 " is over limit (%dms), scan skipped\n",
 670                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 671                         ret = -1;
 672                         break;
 673                 }
 674
 675                 priv->adapter->scan_channels = start_chan;
 676
 677                 /* Send the scan command to the firmware with the specified
 678                    cfg */
 679                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 680                                              HostCmd_ACT_GEN_SET, 0,
 681                                              scan_cfg_out);
 682                 if (ret)
 683                         break;
 684         }
 685
 686         if (ret)
 687                 return -1;
 688
 689         return 0;
 690 }
 691
 692 /*
 693  * This function constructs a scan command configuration structure to use
 694  * in scan commands.
 695  *
 696  * Application layer or other functions can invoke network scanning
 697  * with a scan configuration supplied in a user scan configuration structure.
 698  * This structure is used as the basis of one or many scan command configuration
 699  * commands that are sent to the command processing module and eventually to the
 700  * firmware.
 701  *
 702  * This function creates a scan command configuration structure  based on the
 703  * following user supplied parameters (if present):
 704  *      - SSID filter
 705  *      - BSSID filter
 706  *      - Number of Probes to be sent
 707  *      - Channel list
 708  *
 709  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 710  * If the number of probes is not set, adapter default setting is used.
 711  */
 712 static void
 713 mwifiex_config_scan(struct mwifiex_private *priv,
 714                     const struct mwifiex_user_scan_cfg *user_scan_in,
 715                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 716                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 717                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 718                     u8 *max_chan_per_scan, u8 *filtered_scan,
 719                     u8 *scan_current_only)
 720 {
 721         struct mwifiex_adapter *adapter = priv->adapter;
 722         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 723         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 724         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 725         const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
 726         u8 *tlv_pos;
 727         u32 num_probes;
 728         u32 ssid_len;
 729         u32 chan_idx;
 730         u32 scan_type;
 731         u16 scan_dur;
 732         u8 channel;
 733         u8 radio_type;
 734         int i;
 735         u8 ssid_filter;
 736         u8 rates[MWIFIEX_SUPPORTED_RATES];
 737         u32 rates_size;
 738         struct mwifiex_ie_types_htcap *ht_cap;
 739
 740         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 741            in this routine will be preserved since the routine that sends the
 742            command will append channelTLVs at *chan_list_out.  The difference
 743            between the *chan_list_out and the tlv_buf start will be used to
 744            calculate the size of anything we add in this routine. */
 745         scan_cfg_out->tlv_buf_len = 0;
 746
 747         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 748            so later routines know where channels can be added to the command
 749            buf */
 750         tlv_pos = scan_cfg_out->tlv_buf;
 751
 752         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 753            below if a SSID or BSSID filter is sent in the command */
 754         *filtered_scan = false;
 755
 756         /* Initialize the scan as not being only on the current channel.  If
 757            the channel list is customized, only contains one channel, and is
 758            the active channel, this is set true and data flow is not halted. */
 759         *scan_current_only = false;
 760
 761         if (user_scan_in) {
 762
 763                 /* Default the ssid_filter flag to TRUE, set false under
 764                    certain wildcard conditions and qualified by the existence
 765                    of an SSID list before marking the scan as filtered */
 766                 ssid_filter = true;
 767
 768                 /* Set the BSS type scan filter, use Adapter setting if
 769                    unset */
 770                 scan_cfg_out->bss_mode =
 771                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 772                          bss_mode : (u8) adapter->scan_mode);
 773
 774                 /* Set the number of probes to send, use Adapter setting
 775                    if unset */
 776                 num_probes =
 777                         (user_scan_in->num_probes ? user_scan_in->
 778                          num_probes : adapter->scan_probes);
 779
 780                 /*
 781                  * Set the BSSID filter to the incoming configuration,
 782                  * if non-zero.  If not set, it will remain disabled
 783                  * (all zeros).
 784                  */
 785                 memcpy(scan_cfg_out->specific_bssid,
 786                        user_scan_in->specific_bssid,
 787                        sizeof(scan_cfg_out->specific_bssid));
 788
 789                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 790                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 791
 792                         wildcard_ssid_tlv =
 793                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 794                                 tlv_pos;
 795                         wildcard_ssid_tlv->header.type =
 796                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 797                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 798                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 799                                                          max_ssid_length)));
 800
 801                         /*
 802                          * max_ssid_length = 0 tells firmware to perform
 803                          * specific scan for the SSID filled, whereas
 804                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 805                          * wildcard scan.
 806                          */
 807                         if (ssid_len)
 808                                 wildcard_ssid_tlv->max_ssid_length = 0;
 809                         else
 810                                 wildcard_ssid_tlv->max_ssid_length =
 811                                                         IEEE80211_MAX_SSID_LEN;
 812
 813                         memcpy(wildcard_ssid_tlv->ssid,
 814                                user_scan_in->ssid_list[i].ssid, ssid_len);
 815
 816                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 817                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 818
 819                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 820                                 i, wildcard_ssid_tlv->ssid,
 821                                 wildcard_ssid_tlv->max_ssid_length);
 822
 823                         /* Empty wildcard ssid with a maxlen will match many or
 824                            potentially all SSIDs (maxlen == 32), therefore do
 825                            not treat the scan as
 826                            filtered. */
 827                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 828                                 ssid_filter = false;
 829                 }
 830
 831                 /*
 832                  *  The default number of channels sent in the command is low to
 833                  *  ensure the response buffer from the firmware does not
 834                  *  truncate scan results.  That is not an issue with an SSID
 835                  *  or BSSID filter applied to the scan results in the firmware.
 836                  */
 837                 if ((i && ssid_filter) ||
 838                     memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 839                            sizeof(zero_mac)))
 840                         *filtered_scan = true;
 841         } else {
 842                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 843                 num_probes = adapter->scan_probes;
 844         }
 845
 846         /*
 847          *  If a specific BSSID or SSID is used, the number of channels in the
 848          *  scan command will be increased to the absolute maximum.
 849          */
 850         if (*filtered_scan)
 851                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 852         else
 853                 *max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD;
 854
 855         /* If the input config or adapter has the number of Probes set,
 856            add tlv */
 857         if (num_probes) {
 858
 859                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 860                         num_probes);
 861
 862                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 863                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 864                 num_probes_tlv->header.len =
 865                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 866                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 867
 868                 tlv_pos += sizeof(num_probes_tlv->header) +
 869                         le16_to_cpu(num_probes_tlv->header.len);
 870
 871         }
 872
 873         /* Append rates tlv */
 874         memset(rates, 0, sizeof(rates));
 875
 876         rates_size = mwifiex_get_supported_rates(priv, rates);
 877
 878         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 879         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 880         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 881         memcpy(rates_tlv->rates, rates, rates_size);
 882         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 883
 884         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 885
 886         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 887             (priv->adapter->config_bands & BAND_GN ||
 888              priv->adapter->config_bands & BAND_AN)) {
 889                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 890                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 891                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 892                 ht_cap->header.len =
 893                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 894                 radio_type =
 895                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 896                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 897                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 898         }
 899
 900         /* Append vendor specific IE TLV */
 901         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 902
 903         /*
 904          * Set the output for the channel TLV to the address in the tlv buffer
 905          *   past any TLVs that were added in this function (SSID, num_probes).
 906          *   Channel TLVs will be added past this for each scan command,
 907          *   preserving the TLVs that were previously added.
 908          */
 909         *chan_list_out =
 910                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 911
 912         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 913
 914                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 915
 916                 for (chan_idx = 0;
 917                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
 918                      user_scan_in->chan_list[chan_idx].chan_number;
 919                      chan_idx++) {
 920
 921                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 922                         (scan_chan_list + chan_idx)->chan_number = channel;
 923
 924                         radio_type =
 925                                 user_scan_in->chan_list[chan_idx].radio_type;
 926                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 927
 928                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 929
 930                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 931                                 (scan_chan_list +
 932                                  chan_idx)->chan_scan_mode_bitmap
 933                                         |= MWIFIEX_PASSIVE_SCAN;
 934                         else
 935                                 (scan_chan_list +
 936                                  chan_idx)->chan_scan_mode_bitmap
 937                                         &= ~MWIFIEX_PASSIVE_SCAN;
 938
 939                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 940                                 scan_dur = (u16) user_scan_in->
 941                                         chan_list[chan_idx].scan_time;
 942                         } else {
 943                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 944                                         scan_dur = adapter->passive_scan_time;
 945                                 else if (*filtered_scan)
 946                                         scan_dur = adapter->specific_scan_time;
 947                                 else
 948                                         scan_dur = adapter->active_scan_time;
 949                         }
 950
 951                         (scan_chan_list + chan_idx)->min_scan_time =
 952                                 cpu_to_le16(scan_dur);
 953                         (scan_chan_list + chan_idx)->max_scan_time =
 954                                 cpu_to_le16(scan_dur);
 955                 }
 956
 957                 /* Check if we are only scanning the current channel */
 958                 if ((chan_idx == 1) &&
 959                     (user_scan_in->chan_list[0].chan_number ==
 960                      priv->curr_bss_params.bss_descriptor.channel)) {
 961                         *scan_current_only = true;
 962                         dev_dbg(adapter->dev,
 963                                 "info: Scan: Scanning current channel only\n");
 964                 }
 965
 966         } else {
 967                 dev_dbg(adapter->dev,
 968                         "info: Scan: Creating full region channel list\n");
 969                 mwifiex_scan_create_channel_list(priv, user_scan_in,
 970                                                  scan_chan_list,
 971                                                  *filtered_scan);
 972         }
 973 }
 974
 975 /*
 976  * This function inspects the scan response buffer for pointers to
 977  * expected TLVs.
 978  *
 979  * TLVs can be included at the end of the scan response BSS information.
 980  *
 981  * Data in the buffer is parsed pointers to TLVs that can potentially
 982  * be passed back in the response.
 983  */
 984 static void
 985 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
 986                                      struct mwifiex_ie_types_data *tlv,
 987                                      u32 tlv_buf_size, u32 req_tlv_type,
 988                                      struct mwifiex_ie_types_data **tlv_data)
 989 {
 990         struct mwifiex_ie_types_data *current_tlv;
 991         u32 tlv_buf_left;
 992         u32 tlv_type;
 993         u32 tlv_len;
 994
 995         current_tlv = tlv;
 996         tlv_buf_left = tlv_buf_size;
 997         *tlv_data = NULL;
 998
 999         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1000                 tlv_buf_size);
1001
1002         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1003
1004                 tlv_type = le16_to_cpu(current_tlv->header.type);
1005                 tlv_len = le16_to_cpu(current_tlv->header.len);
1006
1007                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1008                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1009                         break;
1010                 }
1011
1012                 if (req_tlv_type == tlv_type) {
1013                         switch (tlv_type) {
1014                         case TLV_TYPE_TSFTIMESTAMP:
1015                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1016                                         "timestamp TLV, len = %d\n", tlv_len);
1017                                 *tlv_data = current_tlv;
1018                                 break;
1019                         case TLV_TYPE_CHANNELBANDLIST:
1020                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1021                                         " band list TLV, len = %d\n", tlv_len);
1022                                 *tlv_data = current_tlv;
1023                                 break;
1024                         default:
1025                                 dev_err(adapter->dev,
1026                                         "SCAN_RESP: unhandled TLV = %d\n",
1027                                        tlv_type);
1028                                 /* Give up, this seems corrupted */
1029                                 return;
1030                         }
1031                 }
1032
1033                 if (*tlv_data)
1034                         break;
1035
1036
1037                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1038                 current_tlv =
1039                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1040                                                           tlv_len);
1041
1042         }                       /* while */
1043 }
1044
1045 /*
1046  * This function parses provided beacon buffer and updates
1047  * respective fields in bss descriptor structure.
1048  */
1049 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1050                                     struct mwifiex_bssdescriptor *bss_entry)
1051 {
1052         int ret = 0;
1053         u8 element_id;
1054         struct ieee_types_fh_param_set *fh_param_set;
1055         struct ieee_types_ds_param_set *ds_param_set;
1056         struct ieee_types_cf_param_set *cf_param_set;
1057         struct ieee_types_ibss_param_set *ibss_param_set;
1058         u8 *current_ptr;
1059         u8 *rate;
1060         u8 element_len;
1061         u16 total_ie_len;
1062         u8 bytes_to_copy;
1063         u8 rate_size;
1064         u8 found_data_rate_ie;
1065         u32 bytes_left;
1066         struct ieee_types_vendor_specific *vendor_ie;
1067         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1068         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1069
1070         found_data_rate_ie = false;
1071         rate_size = 0;
1072         current_ptr = bss_entry->beacon_buf;
1073         bytes_left = bss_entry->beacon_buf_size;
1074
1075         /* Process variable IE */
1076         while (bytes_left >= 2) {
1077                 element_id = *current_ptr;
1078                 element_len = *(current_ptr + 1);
1079                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1080
1081                 if (bytes_left < total_ie_len) {
1082                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1083                                 " IE, bytes left < IE length\n");
1084                         return -1;
1085                 }
1086                 switch (element_id) {
1087                 case WLAN_EID_SSID:
1088                         bss_entry->ssid.ssid_len = element_len;
1089                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1090                                element_len);
1091                         dev_dbg(adapter->dev,
1092                                 "info: InterpretIE: ssid: %-32s\n",
1093                                 bss_entry->ssid.ssid);
1094                         break;
1095
1096                 case WLAN_EID_SUPP_RATES:
1097                         memcpy(bss_entry->data_rates, current_ptr + 2,
1098                                element_len);
1099                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1100                                element_len);
1101                         rate_size = element_len;
1102                         found_data_rate_ie = true;
1103                         break;
1104
1105                 case WLAN_EID_FH_PARAMS:
1106                         fh_param_set =
1107                                 (struct ieee_types_fh_param_set *) current_ptr;
1108                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1109                                fh_param_set,
1110                                sizeof(struct ieee_types_fh_param_set));
1111                         break;
1112
1113                 case WLAN_EID_DS_PARAMS:
1114                         ds_param_set =
1115                                 (struct ieee_types_ds_param_set *) current_ptr;
1116
1117                         bss_entry->channel = ds_param_set->current_chan;
1118
1119                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1120                                ds_param_set,
1121                                sizeof(struct ieee_types_ds_param_set));
1122                         break;
1123
1124                 case WLAN_EID_CF_PARAMS:
1125                         cf_param_set =
1126                                 (struct ieee_types_cf_param_set *) current_ptr;
1127                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1128                                cf_param_set,
1129                                sizeof(struct ieee_types_cf_param_set));
1130                         break;
1131
1132                 case WLAN_EID_IBSS_PARAMS:
1133                         ibss_param_set =
1134                                 (struct ieee_types_ibss_param_set *)
1135                                 current_ptr;
1136                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1137                                ibss_param_set,
1138                                sizeof(struct ieee_types_ibss_param_set));
1139                         break;
1140
1141                 case WLAN_EID_ERP_INFO:
1142                         bss_entry->erp_flags = *(current_ptr + 2);
1143                         break;
1144
1145                 case WLAN_EID_EXT_SUPP_RATES:
1146                         /*
1147                          * Only process extended supported rate
1148                          * if data rate is already found.
1149                          * Data rate IE should come before
1150                          * extended supported rate IE
1151                          */
1152                         if (found_data_rate_ie) {
1153                                 if ((element_len + rate_size) >
1154                                     MWIFIEX_SUPPORTED_RATES)
1155                                         bytes_to_copy =
1156                                                 (MWIFIEX_SUPPORTED_RATES -
1157                                                  rate_size);
1158                                 else
1159                                         bytes_to_copy = element_len;
1160
1161                                 rate = (u8 *) bss_entry->data_rates;
1162                                 rate += rate_size;
1163                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1164
1165                                 rate = (u8 *) bss_entry->supported_rates;
1166                                 rate += rate_size;
1167                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1168                         }
1169                         break;
1170
1171                 case WLAN_EID_VENDOR_SPECIFIC:
1172                         vendor_ie = (struct ieee_types_vendor_specific *)
1173                                         current_ptr;
1174
1175                         if (!memcmp
1176                             (vendor_ie->vend_hdr.oui, wpa_oui,
1177                              sizeof(wpa_oui))) {
1178                                 bss_entry->bcn_wpa_ie =
1179                                         (struct ieee_types_vendor_specific *)
1180                                         current_ptr;
1181                                 bss_entry->wpa_offset = (u16)
1182                                         (current_ptr - bss_entry->beacon_buf);
1183                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1184                                     sizeof(wmm_oui))) {
1185                                 if (total_ie_len ==
1186                                     sizeof(struct ieee_types_wmm_parameter) ||
1187                                     total_ie_len ==
1188                                     sizeof(struct ieee_types_wmm_info))
1189                                         /*
1190                                          * Only accept and copy the WMM IE if
1191                                          * it matches the size expected for the
1192                                          * WMM Info IE or the WMM Parameter IE.
1193                                          */
1194                                         memcpy((u8 *) &bss_entry->wmm_ie,
1195                                                current_ptr, total_ie_len);
1196                         }
1197                         break;
1198                 case WLAN_EID_RSN:
1199                         bss_entry->bcn_rsn_ie =
1200                                 (struct ieee_types_generic *) current_ptr;
1201                         bss_entry->rsn_offset = (u16) (current_ptr -
1202                                                         bss_entry->beacon_buf);
1203                         break;
1204                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1205                         bss_entry->bcn_wapi_ie =
1206                                 (struct ieee_types_generic *) current_ptr;
1207                         bss_entry->wapi_offset = (u16) (current_ptr -
1208                                                         bss_entry->beacon_buf);
1209                         break;
1210                 case WLAN_EID_HT_CAPABILITY:
1211                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1212                                         (current_ptr +
1213                                         sizeof(struct ieee_types_header));
1214                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1215                                         sizeof(struct ieee_types_header) -
1216                                         bss_entry->beacon_buf);
1217                         break;
1218                 case WLAN_EID_HT_OPERATION:
1219                         bss_entry->bcn_ht_oper =
1220                                 (struct ieee80211_ht_operation *)(current_ptr +
1221                                         sizeof(struct ieee_types_header));
1222                         bss_entry->ht_info_offset = (u16) (current_ptr +
1223                                         sizeof(struct ieee_types_header) -
1224                                         bss_entry->beacon_buf);
1225                         break;
1226                 case WLAN_EID_BSS_COEX_2040:
1227                         bss_entry->bcn_bss_co_2040 = current_ptr +
1228                                 sizeof(struct ieee_types_header);
1229                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1230                                         sizeof(struct ieee_types_header) -
1231                                                 bss_entry->beacon_buf);
1232                         break;
1233                 case WLAN_EID_EXT_CAPABILITY:
1234                         bss_entry->bcn_ext_cap = current_ptr +
1235                                 sizeof(struct ieee_types_header);
1236                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1237                                         sizeof(struct ieee_types_header) -
1238                                         bss_entry->beacon_buf);
1239                         break;
1240                 default:
1241                         break;
1242                 }
1243
1244                 current_ptr += element_len + 2;
1245
1246                 /* Need to account for IE ID and IE Len */
1247                 bytes_left -= (element_len + 2);
1248
1249         }       /* while (bytes_left > 2) */
1250         return ret;
1251 }
1252
1253 /*
1254  * This function converts radio type scan parameter to a band configuration
1255  * to be used in join command.
1256  */
1257 static u8
1258 mwifiex_radio_type_to_band(u8 radio_type)
1259 {
1260         switch (radio_type) {
1261         case HostCmd_SCAN_RADIO_TYPE_A:
1262                 return BAND_A;
1263         case HostCmd_SCAN_RADIO_TYPE_BG:
1264         default:
1265                 return BAND_G;
1266         }
1267 }
1268
1269 /*
1270  * This is an internal function used to start a scan based on an input
1271  * configuration.
1272  *
1273  * This uses the input user scan configuration information when provided in
1274  * order to send the appropriate scan commands to firmware to populate or
1275  * update the internal driver scan table.
1276  */
1277 static int mwifiex_scan_networks(struct mwifiex_private *priv,
1278                 const struct mwifiex_user_scan_cfg *user_scan_in)
1279 {
1280         int ret = 0;
1281         struct mwifiex_adapter *adapter = priv->adapter;
1282         struct cmd_ctrl_node *cmd_node;
1283         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1284         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1285         u32 buf_size;
1286         struct mwifiex_chan_scan_param_set *scan_chan_list;
1287         u8 filtered_scan;
1288         u8 scan_current_chan_only;
1289         u8 max_chan_per_scan;
1290         unsigned long flags;
1291
1292         if (adapter->scan_processing) {
1293                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1294                 return ret;
1295         }
1296
1297         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1298         adapter->scan_processing = true;
1299         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1300
1301         if (priv->scan_block) {
1302                 dev_dbg(adapter->dev,
1303                         "cmd: Scan is blocked during association...\n");
1304                 return ret;
1305         }
1306
1307         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1308                                                                 GFP_KERNEL);
1309         if (!scan_cfg_out) {
1310                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1311                 return -ENOMEM;
1312         }
1313
1314         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1315                                                 MWIFIEX_USER_SCAN_CHAN_MAX;
1316         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1317         if (!scan_chan_list) {
1318                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1319                 kfree(scan_cfg_out);
1320                 return -ENOMEM;
1321         }
1322
1323         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1324                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1325                             &filtered_scan, &scan_current_chan_only);
1326
1327         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1328                                         &scan_cfg_out->config, chan_list_out,
1329                                         scan_chan_list);
1330
1331         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1332         if (!ret) {
1333                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1334                 if (!list_empty(&adapter->scan_pending_q)) {
1335                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1336                                                     struct cmd_ctrl_node, list);
1337                         list_del(&cmd_node->list);
1338                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1339                                                flags);
1340                         adapter->cmd_queued = cmd_node;
1341                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1342                                                         true);
1343                 } else {
1344                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1345                                                flags);
1346                 }
1347         } else {
1348                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1349                 adapter->scan_processing = true;
1350                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1351         }
1352
1353         kfree(scan_cfg_out);
1354         kfree(scan_chan_list);
1355         return ret;
1356 }
1357
1358 /*
1359  * Sends IOCTL request to start a scan with user configurations.
1360  *
1361  * This function allocates the IOCTL request buffer, fills it
1362  * with requisite parameters and calls the IOCTL handler.
1363  *
1364  * Upon completion, it also generates a wireless event to notify
1365  * applications.
1366  */
1367 int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
1368                                 struct mwifiex_user_scan_cfg *scan_req)
1369 {
1370         int status;
1371
1372         status = mwifiex_scan_networks(priv, scan_req);
1373         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
1374
1375         return status;
1376 }
1377
1378 /*
1379  * This function prepares a scan command to be sent to the firmware.
1380  *
1381  * This uses the scan command configuration sent to the command processing
1382  * module in command preparation stage to configure a scan command structure
1383  * to send to firmware.
1384  *
1385  * The fixed fields specifying the BSS type and BSSID filters as well as a
1386  * variable number/length of TLVs are sent in the command to firmware.
1387  *
1388  * Preparation also includes -
1389  *      - Setting command ID, and proper size
1390  *      - Ensuring correct endian-ness
1391  */
1392 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1393                             struct mwifiex_scan_cmd_config *scan_cfg)
1394 {
1395         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1396
1397         /* Set fixed field variables in scan command */
1398         scan_cmd->bss_mode = scan_cfg->bss_mode;
1399         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1400                sizeof(scan_cmd->bssid));
1401         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1402
1403         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1404
1405         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1406         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1407                                           + sizeof(scan_cmd->bssid)
1408                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1409
1410         return 0;
1411 }
1412
1413 /*
1414  * This function checks compatibility of requested network with current
1415  * driver settings.
1416  */
1417 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1418                                         struct mwifiex_bssdescriptor *bss_desc)
1419 {
1420         int ret = -1;
1421
1422         if (!bss_desc)
1423                 return -1;
1424
1425         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1426                              (u16) bss_desc->channel, 0))) {
1427                 switch (priv->bss_mode) {
1428                 case NL80211_IFTYPE_STATION:
1429                 case NL80211_IFTYPE_ADHOC:
1430                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1431                                                             priv->bss_mode);
1432                         if (ret)
1433                                 dev_err(priv->adapter->dev, "cannot find ssid "
1434                                         "%s\n", bss_desc->ssid.ssid);
1435                                 break;
1436                 default:
1437                                 ret = 0;
1438                 }
1439         }
1440
1441         return ret;
1442 }
1443
1444 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1445                                           struct cfg80211_bss *bss)
1446 {
1447         struct mwifiex_bssdescriptor *bss_desc;
1448         int ret;
1449         unsigned long flags;
1450
1451         /* Allocate and fill new bss descriptor */
1452         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1453                         GFP_KERNEL);
1454         if (!bss_desc) {
1455                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1456                 return -ENOMEM;
1457         }
1458
1459         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1460         if (ret)
1461                 goto done;
1462
1463         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1464         if (ret)
1465                 goto done;
1466
1467         /* Update current bss descriptor parameters */
1468         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1469         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1470         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1471         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1472         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1473         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1474         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1475         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1476         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1477                 0;
1478         priv->curr_bss_params.bss_descriptor.bcn_ht_oper = NULL;
1479         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1480                 0;
1481         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1482                 NULL;
1483         priv->curr_bss_params.bss_descriptor.
1484                 bss_co_2040_offset = 0;
1485         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1486         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1487         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1488         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1489                 0;
1490
1491         /* Make a copy of current BSSID descriptor */
1492         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1493                sizeof(priv->curr_bss_params.bss_descriptor));
1494         mwifiex_save_curr_bcn(priv);
1495         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1496
1497 done:
1498         kfree(bss_desc);
1499         return 0;
1500 }
1501
1502 /*
1503  * This function handles the command response of scan.
1504  *
1505  * The response buffer for the scan command has the following
1506  * memory layout:
1507  *
1508  *      .-------------------------------------------------------------.
1509  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1510  *      .-------------------------------------------------------------.
1511  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1512  *      .-------------------------------------------------------------.
1513  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1514  *      .-------------------------------------------------------------.
1515  *      |  BSSDescription data (variable, size given in BufSize)      |
1516  *      .-------------------------------------------------------------.
1517  *      |  TLV data (variable, size calculated using Header->Size,    |
1518  *      |            BufSize and sizeof the fixed fields above)       |
1519  *      .-------------------------------------------------------------.
1520  */
1521 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1522                             struct host_cmd_ds_command *resp)
1523 {
1524         int ret = 0;
1525         struct mwifiex_adapter *adapter = priv->adapter;
1526         struct cmd_ctrl_node *cmd_node;
1527         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1528         struct mwifiex_ie_types_data *tlv_data;
1529         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1530         u8 *bss_info;
1531         u32 scan_resp_size;
1532         u32 bytes_left;
1533         u32 idx;
1534         u32 tlv_buf_size;
1535         struct mwifiex_chan_freq_power *cfp;
1536         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1537         struct chan_band_param_set *chan_band;
1538         u8 is_bgscan_resp;
1539         unsigned long flags;
1540         struct cfg80211_bss *bss;
1541
1542         is_bgscan_resp = (le16_to_cpu(resp->command)
1543                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1544         if (is_bgscan_resp)
1545                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1546         else
1547                 scan_rsp = &resp->params.scan_resp;
1548
1549
1550         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1551                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1552                         scan_rsp->number_of_sets);
1553                 ret = -1;
1554                 goto done;
1555         }
1556
1557         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1558         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1559                 bytes_left);
1560
1561         scan_resp_size = le16_to_cpu(resp->size);
1562
1563         dev_dbg(adapter->dev,
1564                 "info: SCAN_RESP: returned %d APs before parsing\n",
1565                 scan_rsp->number_of_sets);
1566
1567         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1568
1569         /*
1570          * The size of the TLV buffer is equal to the entire command response
1571          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1572          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1573          *   response header (S_DS_GEN)
1574          */
1575         tlv_buf_size = scan_resp_size - (bytes_left
1576                                          + sizeof(scan_rsp->bss_descript_size)
1577                                          + sizeof(scan_rsp->number_of_sets)
1578                                          + S_DS_GEN);
1579
1580         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1581                                                  bss_desc_and_tlv_buffer +
1582                                                  bytes_left);
1583
1584         /* Search the TLV buffer space in the scan response for any valid
1585            TLVs */
1586         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1587                                              TLV_TYPE_TSFTIMESTAMP,
1588                                              (struct mwifiex_ie_types_data **)
1589                                              &tsf_tlv);
1590
1591         /* Search the TLV buffer space in the scan response for any valid
1592            TLVs */
1593         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1594                                              TLV_TYPE_CHANNELBANDLIST,
1595                                              (struct mwifiex_ie_types_data **)
1596                                              &chan_band_tlv);
1597
1598         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1599                 u8 bssid[ETH_ALEN];
1600                 s32 rssi;
1601                 const u8 *ie_buf;
1602                 size_t ie_len;
1603                 u16 channel = 0;
1604                 u64 fw_tsf = 0;
1605                 u16 beacon_size = 0;
1606                 u32 curr_bcn_bytes;
1607                 u32 freq;
1608                 u16 beacon_period;
1609                 u16 cap_info_bitmap;
1610                 u8 *current_ptr;
1611                 u64 timestamp;
1612                 struct mwifiex_bcn_param *bcn_param;
1613                 struct mwifiex_bss_priv *bss_priv;
1614
1615                 if (bytes_left >= sizeof(beacon_size)) {
1616                         /* Extract & convert beacon size from command buffer */
1617                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1618                         bytes_left -= sizeof(beacon_size);
1619                         bss_info += sizeof(beacon_size);
1620                 }
1621
1622                 if (!beacon_size || beacon_size > bytes_left) {
1623                         bss_info += bytes_left;
1624                         bytes_left = 0;
1625                         return -1;
1626                 }
1627
1628                 /* Initialize the current working beacon pointer for this BSS
1629                  * iteration */
1630                 current_ptr = bss_info;
1631
1632                 /* Advance the return beacon pointer past the current beacon */
1633                 bss_info += beacon_size;
1634                 bytes_left -= beacon_size;
1635
1636                 curr_bcn_bytes = beacon_size;
1637
1638                 /*
1639                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1640                  *   and capability information
1641                  */
1642                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1643                         dev_err(adapter->dev,
1644                                 "InterpretIE: not enough bytes left\n");
1645                         continue;
1646                 }
1647                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1648                 current_ptr += sizeof(*bcn_param);
1649                 curr_bcn_bytes -= sizeof(*bcn_param);
1650
1651                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1652
1653                 rssi = (s32) bcn_param->rssi;
1654                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1655                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1656
1657                 timestamp = le64_to_cpu(bcn_param->timestamp);
1658                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1659
1660                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1661                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1662                         cap_info_bitmap);
1663
1664                 /* Rest of the current buffer are IE's */
1665                 ie_buf = current_ptr;
1666                 ie_len = curr_bcn_bytes;
1667                 dev_dbg(adapter->dev,
1668                         "info: InterpretIE: IELength for this AP = %d\n",
1669                         curr_bcn_bytes);
1670
1671                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1672                         u8 element_id, element_len;
1673
1674                         element_id = *current_ptr;
1675                         element_len = *(current_ptr + 1);
1676                         if (curr_bcn_bytes < element_len +
1677                                         sizeof(struct ieee_types_header)) {
1678                                 dev_err(priv->adapter->dev,
1679                                         "%s: bytes left < IE length\n",
1680                                         __func__);
1681                                 goto done;
1682                         }
1683                         if (element_id == WLAN_EID_DS_PARAMS) {
1684                                 channel = *(current_ptr + sizeof(struct ieee_types_header));
1685                                 break;
1686                         }
1687
1688                         current_ptr += element_len +
1689                                         sizeof(struct ieee_types_header);
1690                         curr_bcn_bytes -= element_len +
1691                                         sizeof(struct ieee_types_header);
1692                 }
1693
1694                 /*
1695                  * If the TSF TLV was appended to the scan results, save this
1696                  * entry's TSF value in the fw_tsf field. It is the firmware's
1697                  * TSF value at the time the beacon or probe response was
1698                  * received.
1699                  */
1700                 if (tsf_tlv)
1701                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1702                                sizeof(fw_tsf));
1703
1704                 if (channel) {
1705                         struct ieee80211_channel *chan;
1706                         u8 band;
1707
1708                         band = BAND_G;
1709                         if (chan_band_tlv) {
1710                                 chan_band =
1711                                         &chan_band_tlv->chan_band_param[idx];
1712                                 band = mwifiex_radio_type_to_band(
1713                                                 chan_band->radio_type
1714                                                 & (BIT(0) | BIT(1)));
1715                         }
1716
1717                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1718
1719                         freq = cfp ? cfp->freq : 0;
1720
1721                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1722
1723                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1724                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1725                                               chan, bssid, timestamp,
1726                                               cap_info_bitmap, beacon_period,
1727                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1728                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1729                                 bss_priv->band = band;
1730                                 bss_priv->fw_tsf = fw_tsf;
1731                                 if (priv->media_connected &&
1732                                     !memcmp(bssid,
1733                                             priv->curr_bss_params.bss_descriptor
1734                                             .mac_address, ETH_ALEN))
1735                                         mwifiex_update_curr_bss_params(priv,
1736                                                                        bss);
1737                                 cfg80211_put_bss(bss);
1738                         }
1739                 } else {
1740                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1741                 }
1742         }
1743
1744         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1745         if (list_empty(&adapter->scan_pending_q)) {
1746                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1747                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1748                 adapter->scan_processing = false;
1749                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1750
1751                 /* Need to indicate IOCTL complete */
1752                 if (adapter->curr_cmd->wait_q_enabled) {
1753                         adapter->cmd_wait_q.status = 0;
1754                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1755                 }
1756                 if (priv->report_scan_result)
1757                         priv->report_scan_result = false;
1758                 if (priv->scan_pending_on_block) {
1759                         priv->scan_pending_on_block = false;
1760                         up(&priv->async_sem);
1761                 }
1762
1763                 if (priv->user_scan_cfg) {
1764                         dev_dbg(priv->adapter->dev,
1765                                 "info: %s: sending scan results\n", __func__);
1766                         cfg80211_scan_done(priv->scan_request, 0);
1767                         priv->scan_request = NULL;
1768                         kfree(priv->user_scan_cfg);
1769                         priv->user_scan_cfg = NULL;
1770                 }
1771         } else {
1772                 /* Get scan command from scan_pending_q and put to
1773                    cmd_pending_q */
1774                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1775                                             struct cmd_ctrl_node, list);
1776                 list_del(&cmd_node->list);
1777                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1778
1779                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1780         }
1781
1782 done:
1783         return ret;
1784 }
1785
1786 /*
1787  * This function prepares command for background scan query.
1788  *
1789  * Preparation includes -
1790  *      - Setting command ID and proper size
1791  *      - Setting background scan flush parameter
1792  *      - Ensuring correct endian-ness
1793  */
1794 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1795 {
1796         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1797                 &cmd->params.bg_scan_query;
1798
1799         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1800         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1801                                 + S_DS_GEN);
1802
1803         bg_query->flush = 1;
1804
1805         return 0;
1806 }
1807
1808 /*
1809  * This function inserts scan command node to the scan pending queue.
1810  */
1811 void
1812 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1813                        struct cmd_ctrl_node *cmd_node)
1814 {
1815         struct mwifiex_adapter *adapter = priv->adapter;
1816         unsigned long flags;
1817
1818         cmd_node->wait_q_enabled = true;
1819         cmd_node->condition = &adapter->scan_wait_q_woken;
1820         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1821         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1822         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1823 }
1824
1825 /*
1826  * This function sends a scan command for all available channels to the
1827  * firmware, filtered on a specific SSID.
1828  */
1829 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1830                                       struct cfg80211_ssid *req_ssid)
1831 {
1832         struct mwifiex_adapter *adapter = priv->adapter;
1833         int ret = 0;
1834         struct mwifiex_user_scan_cfg *scan_cfg;
1835
1836         if (!req_ssid)
1837                 return -1;
1838
1839         if (adapter->scan_processing) {
1840                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1841                 return ret;
1842         }
1843
1844         if (priv->scan_block) {
1845                 dev_dbg(adapter->dev,
1846                         "cmd: Scan is blocked during association...\n");
1847                 return ret;
1848         }
1849
1850         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1851         if (!scan_cfg) {
1852                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1853                 return -ENOMEM;
1854         }
1855
1856         scan_cfg->ssid_list = req_ssid;
1857         scan_cfg->num_ssids = 1;
1858
1859         ret = mwifiex_scan_networks(priv, scan_cfg);
1860
1861         kfree(scan_cfg);
1862         return ret;
1863 }
1864
1865 /*
1866  * Sends IOCTL request to start a scan.
1867  *
1868  * This function allocates the IOCTL request buffer, fills it
1869  * with requisite parameters and calls the IOCTL handler.
1870  *
1871  * Scan command can be issued for both normal scan and specific SSID
1872  * scan, depending upon whether an SSID is provided or not.
1873  */
1874 int mwifiex_request_scan(struct mwifiex_private *priv,
1875                          struct cfg80211_ssid *req_ssid)
1876 {
1877         int ret;
1878
1879         if (down_interruptible(&priv->async_sem)) {
1880                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1881                         __func__);
1882                 return -1;
1883         }
1884         priv->scan_pending_on_block = true;
1885
1886         priv->adapter->scan_wait_q_woken = false;
1887
1888         if (req_ssid && req_ssid->ssid_len != 0)
1889                 /* Specific SSID scan */
1890                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1891         else
1892                 /* Normal scan */
1893                 ret = mwifiex_scan_networks(priv, NULL);
1894
1895         if (!ret)
1896                 ret = mwifiex_wait_queue_complete(priv->adapter);
1897
1898         if (ret == -1) {
1899                 priv->scan_pending_on_block = false;
1900                 up(&priv->async_sem);
1901         }
1902
1903         return ret;
1904 }
1905
1906 /*
1907  * This function appends the vendor specific IE TLV to a buffer.
1908  */
1909 int
1910 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1911                             u16 vsie_mask, u8 **buffer)
1912 {
1913         int id, ret_len = 0;
1914         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1915
1916         if (!buffer)
1917                 return 0;
1918         if (!(*buffer))
1919                 return 0;
1920
1921         /*
1922          * Traverse through the saved vendor specific IE array and append
1923          * the selected(scan/assoc/adhoc) IE as TLV to the command
1924          */
1925         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1926                 if (priv->vs_ie[id].mask & vsie_mask) {
1927                         vs_param_set =
1928                                 (struct mwifiex_ie_types_vendor_param_set *)
1929                                 *buffer;
1930                         vs_param_set->header.type =
1931                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1932                         vs_param_set->header.len =
1933                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1934                                 & 0x00FF) + 2);
1935                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1936                                le16_to_cpu(vs_param_set->header.len));
1937                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1938                                    sizeof(struct mwifiex_ie_types_header);
1939                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1940                                    sizeof(struct mwifiex_ie_types_header);
1941                 }
1942         }
1943         return ret_len;
1944 }
1945
1946 /*
1947  * This function saves a beacon buffer of the current BSS descriptor.
1948  *
1949  * The current beacon buffer is saved so that it can be restored in the
1950  * following cases that makes the beacon buffer not to contain the current
1951  * ssid's beacon buffer.
1952  *      - The current ssid was not found somehow in the last scan.
1953  *      - The current ssid was the last entry of the scan table and overloaded.
1954  */
1955 void
1956 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1957 {
1958         struct mwifiex_bssdescriptor *curr_bss =
1959                 &priv->curr_bss_params.bss_descriptor;
1960
1961         if (!curr_bss->beacon_buf_size)
1962                 return;
1963
1964         /* allocate beacon buffer at 1st time; or if it's size has changed */
1965         if (!priv->curr_bcn_buf ||
1966             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1967                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1968
1969                 kfree(priv->curr_bcn_buf);
1970                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1971                                              GFP_ATOMIC);
1972                 if (!priv->curr_bcn_buf) {
1973                         dev_err(priv->adapter->dev,
1974                                 "failed to alloc curr_bcn_buf\n");
1975                         return;
1976                 }
1977         }
1978
1979         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
1980                curr_bss->beacon_buf_size);
1981         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
1982                 priv->curr_bcn_size);
1983
1984         curr_bss->beacon_buf = priv->curr_bcn_buf;
1985
1986         /* adjust the pointers in the current BSS descriptor */
1987         if (curr_bss->bcn_wpa_ie)
1988                 curr_bss->bcn_wpa_ie =
1989                         (struct ieee_types_vendor_specific *)
1990                         (curr_bss->beacon_buf +
1991                          curr_bss->wpa_offset);
1992
1993         if (curr_bss->bcn_rsn_ie)
1994                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
1995                         (curr_bss->beacon_buf +
1996                          curr_bss->rsn_offset);
1997
1998         if (curr_bss->bcn_ht_cap)
1999                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2000                         (curr_bss->beacon_buf +
2001                          curr_bss->ht_cap_offset);
2002
2003         if (curr_bss->bcn_ht_oper)
2004                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2005                         (curr_bss->beacon_buf +
2006                          curr_bss->ht_info_offset);
2007
2008         if (curr_bss->bcn_bss_co_2040)
2009                 curr_bss->bcn_bss_co_2040 =
2010                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2011
2012         if (curr_bss->bcn_ext_cap)
2013                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2014                         curr_bss->ext_cap_offset;
2015 }
2016
2017 /*
2018  * This function frees the current BSS descriptor beacon buffer.
2019  */
2020 void
2021 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2022 {
2023         kfree(priv->curr_bcn_buf);
2024         priv->curr_bcn_buf = NULL;
2025 }