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 = (struct mwifiex_ie_types_data *)
1018                                         current_tlv;
1019                                 break;
1020                         case TLV_TYPE_CHANNELBANDLIST:
1021                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1022                                         " band list TLV, len = %d\n", tlv_len);
1023                                 *tlv_data = (struct mwifiex_ie_types_data *)
1024                                         current_tlv;
1025                                 break;
1026                         default:
1027                                 dev_err(adapter->dev,
1028                                         "SCAN_RESP: unhandled TLV = %d\n",
1029                                        tlv_type);
1030                                 /* Give up, this seems corrupted */
1031                                 return;
1032                         }
1033                 }
1034
1035                 if (*tlv_data)
1036                         break;
1037
1038
1039                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1040                 current_tlv =
1041                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1042                                                           tlv_len);
1043
1044         }                       /* while */
1045 }
1046
1047 /*
1048  * This function parses provided beacon buffer and updates
1049  * respective fields in bss descriptor structure.
1050  */
1051 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1052                                     struct mwifiex_bssdescriptor *bss_entry)
1053 {
1054         int ret = 0;
1055         u8 element_id;
1056         struct ieee_types_fh_param_set *fh_param_set;
1057         struct ieee_types_ds_param_set *ds_param_set;
1058         struct ieee_types_cf_param_set *cf_param_set;
1059         struct ieee_types_ibss_param_set *ibss_param_set;
1060         u8 *current_ptr;
1061         u8 *rate;
1062         u8 element_len;
1063         u16 total_ie_len;
1064         u8 bytes_to_copy;
1065         u8 rate_size;
1066         u8 found_data_rate_ie;
1067         u32 bytes_left;
1068         struct ieee_types_vendor_specific *vendor_ie;
1069         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1070         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1071
1072         found_data_rate_ie = false;
1073         rate_size = 0;
1074         current_ptr = bss_entry->beacon_buf;
1075         bytes_left = bss_entry->beacon_buf_size;
1076
1077         /* Process variable IE */
1078         while (bytes_left >= 2) {
1079                 element_id = *current_ptr;
1080                 element_len = *(current_ptr + 1);
1081                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1082
1083                 if (bytes_left < total_ie_len) {
1084                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1085                                 " IE, bytes left < IE length\n");
1086                         return -1;
1087                 }
1088                 switch (element_id) {
1089                 case WLAN_EID_SSID:
1090                         bss_entry->ssid.ssid_len = element_len;
1091                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1092                                element_len);
1093                         dev_dbg(adapter->dev,
1094                                 "info: InterpretIE: ssid: %-32s\n",
1095                                 bss_entry->ssid.ssid);
1096                         break;
1097
1098                 case WLAN_EID_SUPP_RATES:
1099                         memcpy(bss_entry->data_rates, current_ptr + 2,
1100                                element_len);
1101                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1102                                element_len);
1103                         rate_size = element_len;
1104                         found_data_rate_ie = true;
1105                         break;
1106
1107                 case WLAN_EID_FH_PARAMS:
1108                         fh_param_set =
1109                                 (struct ieee_types_fh_param_set *) current_ptr;
1110                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1111                                fh_param_set,
1112                                sizeof(struct ieee_types_fh_param_set));
1113                         break;
1114
1115                 case WLAN_EID_DS_PARAMS:
1116                         ds_param_set =
1117                                 (struct ieee_types_ds_param_set *) current_ptr;
1118
1119                         bss_entry->channel = ds_param_set->current_chan;
1120
1121                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1122                                ds_param_set,
1123                                sizeof(struct ieee_types_ds_param_set));
1124                         break;
1125
1126                 case WLAN_EID_CF_PARAMS:
1127                         cf_param_set =
1128                                 (struct ieee_types_cf_param_set *) current_ptr;
1129                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1130                                cf_param_set,
1131                                sizeof(struct ieee_types_cf_param_set));
1132                         break;
1133
1134                 case WLAN_EID_IBSS_PARAMS:
1135                         ibss_param_set =
1136                                 (struct ieee_types_ibss_param_set *)
1137                                 current_ptr;
1138                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1139                                ibss_param_set,
1140                                sizeof(struct ieee_types_ibss_param_set));
1141                         break;
1142
1143                 case WLAN_EID_ERP_INFO:
1144                         bss_entry->erp_flags = *(current_ptr + 2);
1145                         break;
1146
1147                 case WLAN_EID_EXT_SUPP_RATES:
1148                         /*
1149                          * Only process extended supported rate
1150                          * if data rate is already found.
1151                          * Data rate IE should come before
1152                          * extended supported rate IE
1153                          */
1154                         if (found_data_rate_ie) {
1155                                 if ((element_len + rate_size) >
1156                                     MWIFIEX_SUPPORTED_RATES)
1157                                         bytes_to_copy =
1158                                                 (MWIFIEX_SUPPORTED_RATES -
1159                                                  rate_size);
1160                                 else
1161                                         bytes_to_copy = element_len;
1162
1163                                 rate = (u8 *) bss_entry->data_rates;
1164                                 rate += rate_size;
1165                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1166
1167                                 rate = (u8 *) bss_entry->supported_rates;
1168                                 rate += rate_size;
1169                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1170                         }
1171                         break;
1172
1173                 case WLAN_EID_VENDOR_SPECIFIC:
1174                         vendor_ie = (struct ieee_types_vendor_specific *)
1175                                         current_ptr;
1176
1177                         if (!memcmp
1178                             (vendor_ie->vend_hdr.oui, wpa_oui,
1179                              sizeof(wpa_oui))) {
1180                                 bss_entry->bcn_wpa_ie =
1181                                         (struct ieee_types_vendor_specific *)
1182                                         current_ptr;
1183                                 bss_entry->wpa_offset = (u16)
1184                                         (current_ptr - bss_entry->beacon_buf);
1185                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1186                                     sizeof(wmm_oui))) {
1187                                 if (total_ie_len ==
1188                                     sizeof(struct ieee_types_wmm_parameter) ||
1189                                     total_ie_len ==
1190                                     sizeof(struct ieee_types_wmm_info))
1191                                         /*
1192                                          * Only accept and copy the WMM IE if
1193                                          * it matches the size expected for the
1194                                          * WMM Info IE or the WMM Parameter IE.
1195                                          */
1196                                         memcpy((u8 *) &bss_entry->wmm_ie,
1197                                                current_ptr, total_ie_len);
1198                         }
1199                         break;
1200                 case WLAN_EID_RSN:
1201                         bss_entry->bcn_rsn_ie =
1202                                 (struct ieee_types_generic *) current_ptr;
1203                         bss_entry->rsn_offset = (u16) (current_ptr -
1204                                                         bss_entry->beacon_buf);
1205                         break;
1206                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1207                         bss_entry->bcn_wapi_ie =
1208                                 (struct ieee_types_generic *) current_ptr;
1209                         bss_entry->wapi_offset = (u16) (current_ptr -
1210                                                         bss_entry->beacon_buf);
1211                         break;
1212                 case WLAN_EID_HT_CAPABILITY:
1213                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1214                                         (current_ptr +
1215                                         sizeof(struct ieee_types_header));
1216                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1217                                         sizeof(struct ieee_types_header) -
1218                                         bss_entry->beacon_buf);
1219                         break;
1220                 case WLAN_EID_HT_OPERATION:
1221                         bss_entry->bcn_ht_oper =
1222                                 (struct ieee80211_ht_operation *)(current_ptr +
1223                                         sizeof(struct ieee_types_header));
1224                         bss_entry->ht_info_offset = (u16) (current_ptr +
1225                                         sizeof(struct ieee_types_header) -
1226                                         bss_entry->beacon_buf);
1227                         break;
1228                 case WLAN_EID_BSS_COEX_2040:
1229                         bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
1230                                         sizeof(struct ieee_types_header));
1231                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1232                                         sizeof(struct ieee_types_header) -
1233                                                 bss_entry->beacon_buf);
1234                         break;
1235                 case WLAN_EID_EXT_CAPABILITY:
1236                         bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
1237                                         sizeof(struct ieee_types_header));
1238                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1239                                         sizeof(struct ieee_types_header) -
1240                                         bss_entry->beacon_buf);
1241                         break;
1242                 default:
1243                         break;
1244                 }
1245
1246                 current_ptr += element_len + 2;
1247
1248                 /* Need to account for IE ID and IE Len */
1249                 bytes_left -= (element_len + 2);
1250
1251         }       /* while (bytes_left > 2) */
1252         return ret;
1253 }
1254
1255 /*
1256  * This function converts radio type scan parameter to a band configuration
1257  * to be used in join command.
1258  */
1259 static u8
1260 mwifiex_radio_type_to_band(u8 radio_type)
1261 {
1262         switch (radio_type) {
1263         case HostCmd_SCAN_RADIO_TYPE_A:
1264                 return BAND_A;
1265         case HostCmd_SCAN_RADIO_TYPE_BG:
1266         default:
1267                 return BAND_G;
1268         }
1269 }
1270
1271 /*
1272  * This is an internal function used to start a scan based on an input
1273  * configuration.
1274  *
1275  * This uses the input user scan configuration information when provided in
1276  * order to send the appropriate scan commands to firmware to populate or
1277  * update the internal driver scan table.
1278  */
1279 static int mwifiex_scan_networks(struct mwifiex_private *priv,
1280                 const struct mwifiex_user_scan_cfg *user_scan_in)
1281 {
1282         int ret = 0;
1283         struct mwifiex_adapter *adapter = priv->adapter;
1284         struct cmd_ctrl_node *cmd_node;
1285         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1286         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1287         u32 buf_size;
1288         struct mwifiex_chan_scan_param_set *scan_chan_list;
1289         u8 filtered_scan;
1290         u8 scan_current_chan_only;
1291         u8 max_chan_per_scan;
1292         unsigned long flags;
1293
1294         if (adapter->scan_processing) {
1295                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1296                 return ret;
1297         }
1298
1299         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1300         adapter->scan_processing = true;
1301         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1302
1303         if (priv->scan_block) {
1304                 dev_dbg(adapter->dev,
1305                         "cmd: Scan is blocked during association...\n");
1306                 return ret;
1307         }
1308
1309         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1310                                                                 GFP_KERNEL);
1311         if (!scan_cfg_out) {
1312                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1313                 return -ENOMEM;
1314         }
1315
1316         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1317                                                 MWIFIEX_USER_SCAN_CHAN_MAX;
1318         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1319         if (!scan_chan_list) {
1320                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1321                 kfree(scan_cfg_out);
1322                 return -ENOMEM;
1323         }
1324
1325         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1326                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1327                             &filtered_scan, &scan_current_chan_only);
1328
1329         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1330                                         &scan_cfg_out->config, chan_list_out,
1331                                         scan_chan_list);
1332
1333         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1334         if (!ret) {
1335                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1336                 if (!list_empty(&adapter->scan_pending_q)) {
1337                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1338                                                     struct cmd_ctrl_node, list);
1339                         list_del(&cmd_node->list);
1340                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1341                                                flags);
1342                         adapter->cmd_queued = cmd_node;
1343                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1344                                                         true);
1345                 } else {
1346                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1347                                                flags);
1348                 }
1349         } else {
1350                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1351                 adapter->scan_processing = true;
1352                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1353         }
1354
1355         kfree(scan_cfg_out);
1356         kfree(scan_chan_list);
1357         return ret;
1358 }
1359
1360 /*
1361  * Sends IOCTL request to start a scan with user configurations.
1362  *
1363  * This function allocates the IOCTL request buffer, fills it
1364  * with requisite parameters and calls the IOCTL handler.
1365  *
1366  * Upon completion, it also generates a wireless event to notify
1367  * applications.
1368  */
1369 int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
1370                                 struct mwifiex_user_scan_cfg *scan_req)
1371 {
1372         int status;
1373
1374         status = mwifiex_scan_networks(priv, scan_req);
1375         queue_work(priv->adapter->workqueue, &priv->adapter->main_work);
1376
1377         return status;
1378 }
1379
1380 /*
1381  * This function prepares a scan command to be sent to the firmware.
1382  *
1383  * This uses the scan command configuration sent to the command processing
1384  * module in command preparation stage to configure a scan command structure
1385  * to send to firmware.
1386  *
1387  * The fixed fields specifying the BSS type and BSSID filters as well as a
1388  * variable number/length of TLVs are sent in the command to firmware.
1389  *
1390  * Preparation also includes -
1391  *      - Setting command ID, and proper size
1392  *      - Ensuring correct endian-ness
1393  */
1394 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1395                             struct mwifiex_scan_cmd_config *scan_cfg)
1396 {
1397         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1398
1399         /* Set fixed field variables in scan command */
1400         scan_cmd->bss_mode = scan_cfg->bss_mode;
1401         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1402                sizeof(scan_cmd->bssid));
1403         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1404
1405         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1406
1407         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1408         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1409                                           + sizeof(scan_cmd->bssid)
1410                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1411
1412         return 0;
1413 }
1414
1415 /*
1416  * This function checks compatibility of requested network with current
1417  * driver settings.
1418  */
1419 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1420                                         struct mwifiex_bssdescriptor *bss_desc)
1421 {
1422         int ret = -1;
1423
1424         if (!bss_desc)
1425                 return -1;
1426
1427         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1428                              (u16) bss_desc->channel, 0))) {
1429                 switch (priv->bss_mode) {
1430                 case NL80211_IFTYPE_STATION:
1431                 case NL80211_IFTYPE_ADHOC:
1432                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1433                                                             priv->bss_mode);
1434                         if (ret)
1435                                 dev_err(priv->adapter->dev, "cannot find ssid "
1436                                         "%s\n", bss_desc->ssid.ssid);
1437                                 break;
1438                 default:
1439                                 ret = 0;
1440                 }
1441         }
1442
1443         return ret;
1444 }
1445
1446 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1447                                           struct cfg80211_bss *bss)
1448 {
1449         struct mwifiex_bssdescriptor *bss_desc;
1450         int ret;
1451         unsigned long flags;
1452
1453         /* Allocate and fill new bss descriptor */
1454         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1455                         GFP_KERNEL);
1456         if (!bss_desc) {
1457                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1458                 return -ENOMEM;
1459         }
1460
1461         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1462         if (ret)
1463                 goto done;
1464
1465         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1466         if (ret)
1467                 goto done;
1468
1469         /* Update current bss descriptor parameters */
1470         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1471         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1472         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1473         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1474         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1475         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1476         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1477         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1478         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1479                 0;
1480         priv->curr_bss_params.bss_descriptor.bcn_ht_oper = NULL;
1481         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1482                 0;
1483         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1484                 NULL;
1485         priv->curr_bss_params.bss_descriptor.
1486                 bss_co_2040_offset = 0;
1487         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1488         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1489         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1490         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1491                 0;
1492
1493         /* Make a copy of current BSSID descriptor */
1494         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1495                sizeof(priv->curr_bss_params.bss_descriptor));
1496         mwifiex_save_curr_bcn(priv);
1497         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1498
1499 done:
1500         kfree(bss_desc);
1501         return 0;
1502 }
1503
1504 /*
1505  * This function handles the command response of scan.
1506  *
1507  * The response buffer for the scan command has the following
1508  * memory layout:
1509  *
1510  *      .-------------------------------------------------------------.
1511  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1512  *      .-------------------------------------------------------------.
1513  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1514  *      .-------------------------------------------------------------.
1515  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1516  *      .-------------------------------------------------------------.
1517  *      |  BSSDescription data (variable, size given in BufSize)      |
1518  *      .-------------------------------------------------------------.
1519  *      |  TLV data (variable, size calculated using Header->Size,    |
1520  *      |            BufSize and sizeof the fixed fields above)       |
1521  *      .-------------------------------------------------------------.
1522  */
1523 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1524                             struct host_cmd_ds_command *resp)
1525 {
1526         int ret = 0;
1527         struct mwifiex_adapter *adapter = priv->adapter;
1528         struct cmd_ctrl_node *cmd_node;
1529         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1530         struct mwifiex_ie_types_data *tlv_data;
1531         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1532         u8 *bss_info;
1533         u32 scan_resp_size;
1534         u32 bytes_left;
1535         u32 idx;
1536         u32 tlv_buf_size;
1537         struct mwifiex_chan_freq_power *cfp;
1538         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1539         struct chan_band_param_set *chan_band;
1540         u8 is_bgscan_resp;
1541         unsigned long flags;
1542         struct cfg80211_bss *bss;
1543
1544         is_bgscan_resp = (le16_to_cpu(resp->command)
1545                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1546         if (is_bgscan_resp)
1547                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1548         else
1549                 scan_rsp = &resp->params.scan_resp;
1550
1551
1552         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1553                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1554                         scan_rsp->number_of_sets);
1555                 ret = -1;
1556                 goto done;
1557         }
1558
1559         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1560         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1561                 bytes_left);
1562
1563         scan_resp_size = le16_to_cpu(resp->size);
1564
1565         dev_dbg(adapter->dev,
1566                 "info: SCAN_RESP: returned %d APs before parsing\n",
1567                 scan_rsp->number_of_sets);
1568
1569         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1570
1571         /*
1572          * The size of the TLV buffer is equal to the entire command response
1573          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1574          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1575          *   response header (S_DS_GEN)
1576          */
1577         tlv_buf_size = scan_resp_size - (bytes_left
1578                                          + sizeof(scan_rsp->bss_descript_size)
1579                                          + sizeof(scan_rsp->number_of_sets)
1580                                          + S_DS_GEN);
1581
1582         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1583                                                  bss_desc_and_tlv_buffer +
1584                                                  bytes_left);
1585
1586         /* Search the TLV buffer space in the scan response for any valid
1587            TLVs */
1588         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1589                                              TLV_TYPE_TSFTIMESTAMP,
1590                                              (struct mwifiex_ie_types_data **)
1591                                              &tsf_tlv);
1592
1593         /* Search the TLV buffer space in the scan response for any valid
1594            TLVs */
1595         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1596                                              TLV_TYPE_CHANNELBANDLIST,
1597                                              (struct mwifiex_ie_types_data **)
1598                                              &chan_band_tlv);
1599
1600         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1601                 u8 bssid[ETH_ALEN];
1602                 s32 rssi;
1603                 const u8 *ie_buf;
1604                 size_t ie_len;
1605                 u16 channel = 0;
1606                 u64 fw_tsf = 0;
1607                 u16 beacon_size = 0;
1608                 u32 curr_bcn_bytes;
1609                 u32 freq;
1610                 u16 beacon_period;
1611                 u16 cap_info_bitmap;
1612                 u8 *current_ptr;
1613                 u64 timestamp;
1614                 struct mwifiex_bcn_param *bcn_param;
1615                 struct mwifiex_bss_priv *bss_priv;
1616
1617                 if (bytes_left >= sizeof(beacon_size)) {
1618                         /* Extract & convert beacon size from command buffer */
1619                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1620                         bytes_left -= sizeof(beacon_size);
1621                         bss_info += sizeof(beacon_size);
1622                 }
1623
1624                 if (!beacon_size || beacon_size > bytes_left) {
1625                         bss_info += bytes_left;
1626                         bytes_left = 0;
1627                         return -1;
1628                 }
1629
1630                 /* Initialize the current working beacon pointer for this BSS
1631                  * iteration */
1632                 current_ptr = bss_info;
1633
1634                 /* Advance the return beacon pointer past the current beacon */
1635                 bss_info += beacon_size;
1636                 bytes_left -= beacon_size;
1637
1638                 curr_bcn_bytes = beacon_size;
1639
1640                 /*
1641                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1642                  *   and capability information
1643                  */
1644                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1645                         dev_err(adapter->dev,
1646                                 "InterpretIE: not enough bytes left\n");
1647                         continue;
1648                 }
1649                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1650                 current_ptr += sizeof(*bcn_param);
1651                 curr_bcn_bytes -= sizeof(*bcn_param);
1652
1653                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1654
1655                 rssi = (s32) bcn_param->rssi;
1656                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1657                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1658
1659                 timestamp = le64_to_cpu(bcn_param->timestamp);
1660                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1661
1662                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1663                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1664                         cap_info_bitmap);
1665
1666                 /* Rest of the current buffer are IE's */
1667                 ie_buf = current_ptr;
1668                 ie_len = curr_bcn_bytes;
1669                 dev_dbg(adapter->dev,
1670                         "info: InterpretIE: IELength for this AP = %d\n",
1671                         curr_bcn_bytes);
1672
1673                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1674                         u8 element_id, element_len;
1675
1676                         element_id = *current_ptr;
1677                         element_len = *(current_ptr + 1);
1678                         if (curr_bcn_bytes < element_len +
1679                                         sizeof(struct ieee_types_header)) {
1680                                 dev_err(priv->adapter->dev,
1681                                         "%s: bytes left < IE length\n",
1682                                         __func__);
1683                                 goto done;
1684                         }
1685                         if (element_id == WLAN_EID_DS_PARAMS) {
1686                                 channel = *(u8 *) (current_ptr +
1687                                         sizeof(struct ieee_types_header));
1688                                 break;
1689                         }
1690
1691                         current_ptr += element_len +
1692                                         sizeof(struct ieee_types_header);
1693                         curr_bcn_bytes -= element_len +
1694                                         sizeof(struct ieee_types_header);
1695                 }
1696
1697                 /*
1698                  * If the TSF TLV was appended to the scan results, save this
1699                  * entry's TSF value in the fw_tsf field. It is the firmware's
1700                  * TSF value at the time the beacon or probe response was
1701                  * received.
1702                  */
1703                 if (tsf_tlv)
1704                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1705                                sizeof(fw_tsf));
1706
1707                 if (channel) {
1708                         struct ieee80211_channel *chan;
1709                         u8 band;
1710
1711                         band = BAND_G;
1712                         if (chan_band_tlv) {
1713                                 chan_band =
1714                                         &chan_band_tlv->chan_band_param[idx];
1715                                 band = mwifiex_radio_type_to_band(
1716                                                 chan_band->radio_type
1717                                                 & (BIT(0) | BIT(1)));
1718                         }
1719
1720                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1721
1722                         freq = cfp ? cfp->freq : 0;
1723
1724                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1725
1726                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1727                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1728                                               chan, bssid, timestamp,
1729                                               cap_info_bitmap, beacon_period,
1730                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1731                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1732                                 bss_priv->band = band;
1733                                 bss_priv->fw_tsf = fw_tsf;
1734                                 if (priv->media_connected &&
1735                                     !memcmp(bssid,
1736                                             priv->curr_bss_params.bss_descriptor
1737                                             .mac_address, ETH_ALEN))
1738                                         mwifiex_update_curr_bss_params(priv,
1739                                                                        bss);
1740                                 cfg80211_put_bss(bss);
1741                         }
1742                 } else {
1743                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1744                 }
1745         }
1746
1747         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1748         if (list_empty(&adapter->scan_pending_q)) {
1749                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1750                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1751                 adapter->scan_processing = false;
1752                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1753
1754                 /* Need to indicate IOCTL complete */
1755                 if (adapter->curr_cmd->wait_q_enabled) {
1756                         adapter->cmd_wait_q.status = 0;
1757                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1758                 }
1759                 if (priv->report_scan_result)
1760                         priv->report_scan_result = false;
1761                 if (priv->scan_pending_on_block) {
1762                         priv->scan_pending_on_block = false;
1763                         up(&priv->async_sem);
1764                 }
1765
1766                 if (priv->user_scan_cfg) {
1767                         dev_dbg(priv->adapter->dev,
1768                                 "info: %s: sending scan results\n", __func__);
1769                         cfg80211_scan_done(priv->scan_request, 0);
1770                         priv->scan_request = NULL;
1771                         kfree(priv->user_scan_cfg);
1772                         priv->user_scan_cfg = NULL;
1773                 }
1774         } else {
1775                 /* Get scan command from scan_pending_q and put to
1776                    cmd_pending_q */
1777                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1778                                             struct cmd_ctrl_node, list);
1779                 list_del(&cmd_node->list);
1780                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1781
1782                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1783         }
1784
1785 done:
1786         return ret;
1787 }
1788
1789 /*
1790  * This function prepares command for background scan query.
1791  *
1792  * Preparation includes -
1793  *      - Setting command ID and proper size
1794  *      - Setting background scan flush parameter
1795  *      - Ensuring correct endian-ness
1796  */
1797 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1798 {
1799         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1800                 &cmd->params.bg_scan_query;
1801
1802         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1803         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1804                                 + S_DS_GEN);
1805
1806         bg_query->flush = 1;
1807
1808         return 0;
1809 }
1810
1811 /*
1812  * This function inserts scan command node to the scan pending queue.
1813  */
1814 void
1815 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1816                        struct cmd_ctrl_node *cmd_node)
1817 {
1818         struct mwifiex_adapter *adapter = priv->adapter;
1819         unsigned long flags;
1820
1821         cmd_node->wait_q_enabled = true;
1822         cmd_node->condition = &adapter->scan_wait_q_woken;
1823         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1824         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1825         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1826 }
1827
1828 /*
1829  * This function sends a scan command for all available channels to the
1830  * firmware, filtered on a specific SSID.
1831  */
1832 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1833                                       struct cfg80211_ssid *req_ssid)
1834 {
1835         struct mwifiex_adapter *adapter = priv->adapter;
1836         int ret = 0;
1837         struct mwifiex_user_scan_cfg *scan_cfg;
1838
1839         if (!req_ssid)
1840                 return -1;
1841
1842         if (adapter->scan_processing) {
1843                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1844                 return ret;
1845         }
1846
1847         if (priv->scan_block) {
1848                 dev_dbg(adapter->dev,
1849                         "cmd: Scan is blocked during association...\n");
1850                 return ret;
1851         }
1852
1853         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1854         if (!scan_cfg) {
1855                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1856                 return -ENOMEM;
1857         }
1858
1859         scan_cfg->ssid_list = req_ssid;
1860         scan_cfg->num_ssids = 1;
1861
1862         ret = mwifiex_scan_networks(priv, scan_cfg);
1863
1864         kfree(scan_cfg);
1865         return ret;
1866 }
1867
1868 /*
1869  * Sends IOCTL request to start a scan.
1870  *
1871  * This function allocates the IOCTL request buffer, fills it
1872  * with requisite parameters and calls the IOCTL handler.
1873  *
1874  * Scan command can be issued for both normal scan and specific SSID
1875  * scan, depending upon whether an SSID is provided or not.
1876  */
1877 int mwifiex_request_scan(struct mwifiex_private *priv,
1878                          struct cfg80211_ssid *req_ssid)
1879 {
1880         int ret;
1881
1882         if (down_interruptible(&priv->async_sem)) {
1883                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1884                         __func__);
1885                 return -1;
1886         }
1887         priv->scan_pending_on_block = true;
1888
1889         priv->adapter->scan_wait_q_woken = false;
1890
1891         if (req_ssid && req_ssid->ssid_len != 0)
1892                 /* Specific SSID scan */
1893                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1894         else
1895                 /* Normal scan */
1896                 ret = mwifiex_scan_networks(priv, NULL);
1897
1898         if (!ret)
1899                 ret = mwifiex_wait_queue_complete(priv->adapter);
1900
1901         if (ret == -1) {
1902                 priv->scan_pending_on_block = false;
1903                 up(&priv->async_sem);
1904         }
1905
1906         return ret;
1907 }
1908
1909 /*
1910  * This function appends the vendor specific IE TLV to a buffer.
1911  */
1912 int
1913 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1914                             u16 vsie_mask, u8 **buffer)
1915 {
1916         int id, ret_len = 0;
1917         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1918
1919         if (!buffer)
1920                 return 0;
1921         if (!(*buffer))
1922                 return 0;
1923
1924         /*
1925          * Traverse through the saved vendor specific IE array and append
1926          * the selected(scan/assoc/adhoc) IE as TLV to the command
1927          */
1928         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1929                 if (priv->vs_ie[id].mask & vsie_mask) {
1930                         vs_param_set =
1931                                 (struct mwifiex_ie_types_vendor_param_set *)
1932                                 *buffer;
1933                         vs_param_set->header.type =
1934                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1935                         vs_param_set->header.len =
1936                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1937                                 & 0x00FF) + 2);
1938                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1939                                le16_to_cpu(vs_param_set->header.len));
1940                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1941                                    sizeof(struct mwifiex_ie_types_header);
1942                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1943                                    sizeof(struct mwifiex_ie_types_header);
1944                 }
1945         }
1946         return ret_len;
1947 }
1948
1949 /*
1950  * This function saves a beacon buffer of the current BSS descriptor.
1951  *
1952  * The current beacon buffer is saved so that it can be restored in the
1953  * following cases that makes the beacon buffer not to contain the current
1954  * ssid's beacon buffer.
1955  *      - The current ssid was not found somehow in the last scan.
1956  *      - The current ssid was the last entry of the scan table and overloaded.
1957  */
1958 void
1959 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1960 {
1961         struct mwifiex_bssdescriptor *curr_bss =
1962                 &priv->curr_bss_params.bss_descriptor;
1963
1964         if (!curr_bss->beacon_buf_size)
1965                 return;
1966
1967         /* allocate beacon buffer at 1st time; or if it's size has changed */
1968         if (!priv->curr_bcn_buf ||
1969             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1970                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1971
1972                 kfree(priv->curr_bcn_buf);
1973                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1974                                              GFP_ATOMIC);
1975                 if (!priv->curr_bcn_buf) {
1976                         dev_err(priv->adapter->dev,
1977                                 "failed to alloc curr_bcn_buf\n");
1978                         return;
1979                 }
1980         }
1981
1982         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
1983                curr_bss->beacon_buf_size);
1984         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
1985                 priv->curr_bcn_size);
1986
1987         curr_bss->beacon_buf = priv->curr_bcn_buf;
1988
1989         /* adjust the pointers in the current BSS descriptor */
1990         if (curr_bss->bcn_wpa_ie)
1991                 curr_bss->bcn_wpa_ie =
1992                         (struct ieee_types_vendor_specific *)
1993                         (curr_bss->beacon_buf +
1994                          curr_bss->wpa_offset);
1995
1996         if (curr_bss->bcn_rsn_ie)
1997                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
1998                         (curr_bss->beacon_buf +
1999                          curr_bss->rsn_offset);
2000
2001         if (curr_bss->bcn_ht_cap)
2002                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2003                         (curr_bss->beacon_buf +
2004                          curr_bss->ht_cap_offset);
2005
2006         if (curr_bss->bcn_ht_oper)
2007                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2008                         (curr_bss->beacon_buf +
2009                          curr_bss->ht_info_offset);
2010
2011         if (curr_bss->bcn_bss_co_2040)
2012                 curr_bss->bcn_bss_co_2040 =
2013                         (u8 *) (curr_bss->beacon_buf +
2014                                         curr_bss->bss_co_2040_offset);
2015
2016         if (curr_bss->bcn_ext_cap)
2017                 curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf +
2018                                 curr_bss->ext_cap_offset);
2019 }
2020
2021 /*
2022  * This function frees the current BSS descriptor beacon buffer.
2023  */
2024 void
2025 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2026 {
2027         kfree(priv->curr_bcn_buf);
2028         priv->curr_bcn_buf = NULL;
2029 }