drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD       4
  32 #define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD    15
  33 #define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD   27
  34 #define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD   35
  35
  36 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  37 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  38                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  39                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  40
  41 /* Memory needed to store supported rate */
  42 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  43                                 + HOSTCMD_SUPPORTED_RATES)
  44
  45 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  46         scan */
  47 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  48         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  49                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  50                         + IEEE80211_MAX_SSID_LEN))
  51
  52 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  53 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  54                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  55                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  56                                 + CHAN_TLV_MAX_SIZE                 \
  57                                 + RATE_TLV_MAX_SIZE                 \
  58                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  59
  60
  61 union mwifiex_scan_cmd_config_tlv {
  62         /* Scan configuration (variable length) */
  63         struct mwifiex_scan_cmd_config config;
  64         /* Max allocated block */
  65         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  66 };
  67
  68 enum cipher_suite {
  69         CIPHER_SUITE_TKIP,
  70         CIPHER_SUITE_CCMP,
  71         CIPHER_SUITE_MAX
  72 };
  73 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  74         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  75         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  76 };
  77 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  78         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  79         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  80 };
  81
  82 /*
  83  * This function parses a given IE for a given OUI.
  84  *
  85  * This is used to parse a WPA/RSN IE to find if it has
  86  * a given oui in PTK.
  87  */
  88 static u8
  89 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  90 {
  91         u8 count;
  92
  93         count = iebody->ptk_cnt[0];
  94
  95         /* There could be multiple OUIs for PTK hence
  96            1) Take the length.
  97            2) Check all the OUIs for AES.
  98            3) If one of them is AES then pass success. */
  99         while (count) {
 100                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
 101                         return MWIFIEX_OUI_PRESENT;
 102
 103                 --count;
 104                 if (count)
 105                         iebody = (struct ie_body *) ((u8 *) iebody +
 106                                                 sizeof(iebody->ptk_body));
 107         }
 108
 109         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 110         return MWIFIEX_OUI_NOT_PRESENT;
 111 }
 112
 113 /*
 114  * This function checks if a given OUI is present in a RSN IE.
 115  *
 116  * The function first checks if a RSN IE is present or not in the
 117  * BSS descriptor. It tries to locate the OUI only if such an IE is
 118  * present.
 119  */
 120 static u8
 121 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 122 {
 123         u8 *oui;
 124         struct ie_body *iebody;
 125         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 126
 127         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 128                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 129                 iebody = (struct ie_body *)
 130                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 131                           RSN_GTK_OUI_OFFSET);
 132                 oui = &mwifiex_rsn_oui[cipher][0];
 133                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 134                 if (ret)
 135                         return ret;
 136         }
 137         return ret;
 138 }
 139
 140 /*
 141  * This function checks if a given OUI is present in a WPA IE.
 142  *
 143  * The function first checks if a WPA IE is present or not in the
 144  * BSS descriptor. It tries to locate the OUI only if such an IE is
 145  * present.
 146  */
 147 static u8
 148 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 149 {
 150         u8 *oui;
 151         struct ie_body *iebody;
 152         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 153
 154         if (((bss_desc->bcn_wpa_ie) &&
 155              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
 156               WLAN_EID_VENDOR_SPECIFIC))) {
 157                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 158                 oui = &mwifiex_wpa_oui[cipher][0];
 159                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 160                 if (ret)
 161                         return ret;
 162         }
 163         return ret;
 164 }
 165
 166 /*
 167  * This function compares two SSIDs and checks if they match.
 168  */
 169 s32
 170 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 171 {
 172         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 173                 return -1;
 174         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 175 }
 176
 177 /*
 178  * This function checks if wapi is enabled in driver and scanned network is
 179  * compatible with it.
 180  */
 181 static bool
 182 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 183                     struct mwifiex_bssdescriptor *bss_desc)
 184 {
 185         if (priv->sec_info.wapi_enabled &&
 186             (bss_desc->bcn_wapi_ie &&
 187              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 188                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 /*
 195  * This function checks if driver is configured with no security mode and
 196  * scanned network is compatible with it.
 197  */
 198 static bool
 199 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 200                       struct mwifiex_bssdescriptor *bss_desc)
 201 {
 202         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 203             !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
 204                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 205                  WLAN_EID_VENDOR_SPECIFIC)) &&
 206             ((!bss_desc->bcn_rsn_ie) ||
 207                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 208                  WLAN_EID_RSN)) &&
 209             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 210                 return true;
 211         }
 212         return false;
 213 }
 214
 215 /*
 216  * This function checks if static WEP is enabled in driver and scanned network
 217  * is compatible with it.
 218  */
 219 static bool
 220 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 221                           struct mwifiex_bssdescriptor *bss_desc)
 222 {
 223         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 224             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 225                 return true;
 226         }
 227         return false;
 228 }
 229
 230 /*
 231  * This function checks if wpa is enabled in driver and scanned network is
 232  * compatible with it.
 233  */
 234 static bool
 235 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 236                    struct mwifiex_bssdescriptor *bss_desc)
 237 {
 238         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 239             !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
 240             ((*(bss_desc->bcn_wpa_ie)).
 241              vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC))
 242            /*
 243             * Privacy bit may NOT be set in some APs like
 244             * LinkSys WRT54G && bss_desc->privacy
 245             */
 246          ) {
 247                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 248                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 249                         "EncMode=%#x privacy=%#x\n", __func__,
 250                         (bss_desc->bcn_wpa_ie) ?
 251                         (*(bss_desc->bcn_wpa_ie)).
 252                         vend_hdr.element_id : 0,
 253                         (bss_desc->bcn_rsn_ie) ?
 254                         (*(bss_desc->bcn_rsn_ie)).
 255                         ieee_hdr.element_id : 0,
 256                         (priv->sec_info.wep_enabled) ? "e" : "d",
 257                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 258                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 259                         priv->sec_info.encryption_mode,
 260                         bss_desc->privacy);
 261                 return true;
 262         }
 263         return false;
 264 }
 265
 266 /*
 267  * This function checks if wpa2 is enabled in driver and scanned network is
 268  * compatible with it.
 269  */
 270 static bool
 271 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 272                     struct mwifiex_bssdescriptor *bss_desc)
 273 {
 274         if (!priv->sec_info.wep_enabled &&
 275             !priv->sec_info.wpa_enabled &&
 276             priv->sec_info.wpa2_enabled &&
 277             ((bss_desc->bcn_rsn_ie) &&
 278              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 279                 /*
 280                  * Privacy bit may NOT be set in some APs like
 281                  * LinkSys WRT54G && bss_desc->privacy
 282                  */
 283                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 284                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 285                         "EncMode=%#x privacy=%#x\n", __func__,
 286                         (bss_desc->bcn_wpa_ie) ?
 287                         (*(bss_desc->bcn_wpa_ie)).
 288                         vend_hdr.element_id : 0,
 289                         (bss_desc->bcn_rsn_ie) ?
 290                         (*(bss_desc->bcn_rsn_ie)).
 291                         ieee_hdr.element_id : 0,
 292                         (priv->sec_info.wep_enabled) ? "e" : "d",
 293                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 294                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 295                         priv->sec_info.encryption_mode,
 296                         bss_desc->privacy);
 297                 return true;
 298         }
 299         return false;
 300 }
 301
 302 /*
 303  * This function checks if adhoc AES is enabled in driver and scanned network is
 304  * compatible with it.
 305  */
 306 static bool
 307 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 308                          struct mwifiex_bssdescriptor *bss_desc)
 309 {
 310         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 311             !priv->sec_info.wpa2_enabled &&
 312             ((!bss_desc->bcn_wpa_ie) ||
 313              ((*(bss_desc->bcn_wpa_ie)).
 314               vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
 315             ((!bss_desc->bcn_rsn_ie) ||
 316              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 317             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 318                 return true;
 319         }
 320         return false;
 321 }
 322
 323 /*
 324  * This function checks if dynamic WEP is enabled in driver and scanned network
 325  * is compatible with it.
 326  */
 327 static bool
 328 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 329                            struct mwifiex_bssdescriptor *bss_desc)
 330 {
 331         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 332             !priv->sec_info.wpa2_enabled &&
 333             ((!bss_desc->bcn_wpa_ie) ||
 334              ((*(bss_desc->bcn_wpa_ie)).
 335               vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
 336             ((!bss_desc->bcn_rsn_ie) ||
 337              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 338             priv->sec_info.encryption_mode && bss_desc->privacy) {
 339                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 340                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 341                         "EncMode=%#x privacy=%#x\n",
 342                         __func__,
 343                         (bss_desc->bcn_wpa_ie) ?
 344                         (*(bss_desc->bcn_wpa_ie)).
 345                         vend_hdr.element_id : 0,
 346                         (bss_desc->bcn_rsn_ie) ?
 347                         (*(bss_desc->bcn_rsn_ie)).
 348                         ieee_hdr.element_id : 0,
 349                         priv->sec_info.encryption_mode,
 350                         bss_desc->privacy);
 351                 return true;
 352         }
 353         return false;
 354 }
 355
 356 /*
 357  * This function checks if a scanned network is compatible with the driver
 358  * settings.
 359  *
 360  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 361  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 362  *    0       0       0      0     NONE      0     0   0   yes No security
 363  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 364  *                                                         HT if no AES)
 365  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 366  *                                                         HT if no AES)
 367  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 368  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 369  *                                                         (disable HT)
 370  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 371  *
 372  * Compatibility is not matched while roaming, except for mode.
 373  */
 374 static s32
 375 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 376                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 377 {
 378         struct mwifiex_adapter *adapter = priv->adapter;
 379
 380         bss_desc->disable_11n = false;
 381
 382         /* Don't check for compatibility if roaming */
 383         if (priv->media_connected &&
 384             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 385             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 386                 return 0;
 387
 388         if (priv->wps.session_enable) {
 389                 dev_dbg(adapter->dev,
 390                         "info: return success directly in WPS period\n");
 391                 return 0;
 392         }
 393
 394         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 395                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 396                 return 0;
 397         }
 398
 399         if (bss_desc->bss_mode == mode) {
 400                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 401                         /* No security */
 402                         return 0;
 403                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 404                         /* Static WEP enabled */
 405                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 406                         bss_desc->disable_11n = true;
 407                         return 0;
 408                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 409                         /* WPA enabled */
 410                         if (((priv->adapter->config_bands & BAND_GN ||
 411                               priv->adapter->config_bands & BAND_AN) &&
 412                              bss_desc->bcn_ht_cap) &&
 413                             !mwifiex_is_wpa_oui_present(bss_desc,
 414                                                          CIPHER_SUITE_CCMP)) {
 415
 416                                 if (mwifiex_is_wpa_oui_present
 417                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 418                                         dev_dbg(adapter->dev,
 419                                                 "info: Disable 11n if AES "
 420                                                 "is not supported by AP\n");
 421                                         bss_desc->disable_11n = true;
 422                                 } else {
 423                                         return -1;
 424                                 }
 425                         }
 426                         return 0;
 427                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 428                         /* WPA2 enabled */
 429                         if (((priv->adapter->config_bands & BAND_GN ||
 430                               priv->adapter->config_bands & BAND_AN) &&
 431                              bss_desc->bcn_ht_cap) &&
 432                             !mwifiex_is_rsn_oui_present(bss_desc,
 433                                                         CIPHER_SUITE_CCMP)) {
 434
 435                                 if (mwifiex_is_rsn_oui_present
 436                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 437                                         dev_dbg(adapter->dev,
 438                                                 "info: Disable 11n if AES "
 439                                                 "is not supported by AP\n");
 440                                         bss_desc->disable_11n = true;
 441                                 } else {
 442                                         return -1;
 443                                 }
 444                         }
 445                         return 0;
 446                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 447                         /* Ad-hoc AES enabled */
 448                         return 0;
 449                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 450                         /* Dynamic WEP enabled */
 451                         return 0;
 452                 }
 453
 454                 /* Security doesn't match */
 455                 dev_dbg(adapter->dev,
 456                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 457                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 458                         (bss_desc->bcn_wpa_ie) ?
 459                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 460                         (bss_desc->bcn_rsn_ie) ?
 461                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 462                         (priv->sec_info.wep_enabled) ? "e" : "d",
 463                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 464                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 465                         priv->sec_info.encryption_mode, bss_desc->privacy);
 466                 return -1;
 467         }
 468
 469         /* Mode doesn't match */
 470         return -1;
 471 }
 472
 473 /*
 474  * This function creates a channel list for the driver to scan, based
 475  * on region/band information.
 476  *
 477  * This routine is used for any scan that is not provided with a
 478  * specific channel list to scan.
 479  */
 480 static int
 481 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 482                                  const struct mwifiex_user_scan_cfg
 483                                                         *user_scan_in,
 484                                  struct mwifiex_chan_scan_param_set
 485                                                         *scan_chan_list,
 486                                  u8 filtered_scan)
 487 {
 488         enum ieee80211_band band;
 489         struct ieee80211_supported_band *sband;
 490         struct ieee80211_channel *ch;
 491         struct mwifiex_adapter *adapter = priv->adapter;
 492         int chan_idx = 0, i;
 493
 494         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 495
 496                 if (!priv->wdev->wiphy->bands[band])
 497                         continue;
 498
 499                 sband = priv->wdev->wiphy->bands[band];
 500
 501                 for (i = 0; (i < sband->n_channels) ; i++) {
 502                         ch = &sband->channels[i];
 503                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 504                                 continue;
 505                         scan_chan_list[chan_idx].radio_type = band;
 506
 507                         if (user_scan_in &&
 508                             user_scan_in->chan_list[0].scan_time)
 509                                 scan_chan_list[chan_idx].max_scan_time =
 510                                         cpu_to_le16((u16) user_scan_in->
 511                                         chan_list[0].scan_time);
 512                         else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 513                                 scan_chan_list[chan_idx].max_scan_time =
 514                                         cpu_to_le16(adapter->passive_scan_time);
 515                         else
 516                                 scan_chan_list[chan_idx].max_scan_time =
 517                                         cpu_to_le16(adapter->active_scan_time);
 518
 519                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 520                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 521                                         |= MWIFIEX_PASSIVE_SCAN;
 522                         else
 523                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 524                                         &= ~MWIFIEX_PASSIVE_SCAN;
 525                         scan_chan_list[chan_idx].chan_number =
 526                                                         (u32) ch->hw_value;
 527                         if (filtered_scan) {
 528                                 scan_chan_list[chan_idx].max_scan_time =
 529                                 cpu_to_le16(adapter->specific_scan_time);
 530                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 531                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 532                         }
 533                         chan_idx++;
 534                 }
 535
 536         }
 537         return chan_idx;
 538 }
 539
 540 /*
 541  * This function constructs and sends multiple scan config commands to
 542  * the firmware.
 543  *
 544  * Previous routines in the code flow have created a scan command configuration
 545  * with any requested TLVs.  This function splits the channel TLV into maximum
 546  * channels supported per scan lists and sends the portion of the channel TLV,
 547  * along with the other TLVs, to the firmware.
 548  */
 549 static int
 550 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 551                           u32 max_chan_per_scan, u8 filtered_scan,
 552                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 553                           struct mwifiex_ie_types_chan_list_param_set
 554                           *chan_tlv_out,
 555                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 556 {
 557         int ret = 0;
 558         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 559         struct mwifiex_chan_scan_param_set *start_chan;
 560
 561         u32 tlv_idx;
 562         u32 total_scan_time;
 563         u32 done_early;
 564
 565         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 566                 dev_dbg(priv->adapter->dev,
 567                         "info: Scan: Null detect: %p, %p, %p\n",
 568                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 569                 return -1;
 570         }
 571
 572         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 573
 574         /* Set the temp channel struct pointer to the start of the desired
 575            list */
 576         tmp_chan_list = scan_chan_list;
 577
 578         /* Loop through the desired channel list, sending a new firmware scan
 579            commands for each max_chan_per_scan channels (or for 1,6,11
 580            individually if configured accordingly) */
 581         while (tmp_chan_list->chan_number) {
 582
 583                 tlv_idx = 0;
 584                 total_scan_time = 0;
 585                 chan_tlv_out->header.len = 0;
 586                 start_chan = tmp_chan_list;
 587                 done_early = false;
 588
 589                 /*
 590                  * Construct the Channel TLV for the scan command.  Continue to
 591                  * insert channel TLVs until:
 592                  *   - the tlv_idx hits the maximum configured per scan command
 593                  *   - the next channel to insert is 0 (end of desired channel
 594                  *     list)
 595                  *   - done_early is set (controlling individual scanning of
 596                  *     1,6,11)
 597                  */
 598                 while (tlv_idx < max_chan_per_scan &&
 599                        tmp_chan_list->chan_number && !done_early) {
 600
 601                         dev_dbg(priv->adapter->dev,
 602                                 "info: Scan: Chan(%3d), Radio(%d),"
 603                                 " Mode(%d, %d), Dur(%d)\n",
 604                                 tmp_chan_list->chan_number,
 605                                 tmp_chan_list->radio_type,
 606                                 tmp_chan_list->chan_scan_mode_bitmap
 607                                 & MWIFIEX_PASSIVE_SCAN,
 608                                 (tmp_chan_list->chan_scan_mode_bitmap
 609                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 610                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 611
 612                         /* Copy the current channel TLV to the command being
 613                            prepared */
 614                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 615                                tmp_chan_list,
 616                                sizeof(chan_tlv_out->chan_scan_param));
 617
 618                         /* Increment the TLV header length by the size
 619                            appended */
 620                         le16_add_cpu(&chan_tlv_out->header.len,
 621                                      sizeof(chan_tlv_out->chan_scan_param));
 622
 623                         /*
 624                          * The tlv buffer length is set to the number of bytes
 625                          * of the between the channel tlv pointer and the start
 626                          * of the tlv buffer.  This compensates for any TLVs
 627                          * that were appended before the channel list.
 628                          */
 629                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 630                                                         scan_cfg_out->tlv_buf);
 631
 632                         /* Add the size of the channel tlv header and the data
 633                            length */
 634                         scan_cfg_out->tlv_buf_len +=
 635                                 (sizeof(chan_tlv_out->header)
 636                                  + le16_to_cpu(chan_tlv_out->header.len));
 637
 638                         /* Increment the index to the channel tlv we are
 639                            constructing */
 640                         tlv_idx++;
 641
 642                         /* Count the total scan time per command */
 643                         total_scan_time +=
 644                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 645
 646                         done_early = false;
 647
 648                         /* Stop the loop if the *current* channel is in the
 649                            1,6,11 set and we are not filtering on a BSSID
 650                            or SSID. */
 651                         if (!filtered_scan &&
 652                             (tmp_chan_list->chan_number == 1 ||
 653                              tmp_chan_list->chan_number == 6 ||
 654                              tmp_chan_list->chan_number == 11))
 655                                 done_early = true;
 656
 657                         /* Increment the tmp pointer to the next channel to
 658                            be scanned */
 659                         tmp_chan_list++;
 660
 661                         /* Stop the loop if the *next* channel is in the 1,6,11
 662                            set.  This will cause it to be the only channel
 663                            scanned on the next interation */
 664                         if (!filtered_scan &&
 665                             (tmp_chan_list->chan_number == 1 ||
 666                              tmp_chan_list->chan_number == 6 ||
 667                              tmp_chan_list->chan_number == 11))
 668                                 done_early = true;
 669                 }
 670
 671                 /* The total scan time should be less than scan command timeout
 672                    value */
 673                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 674                         dev_err(priv->adapter->dev, "total scan time %dms"
 675                                 " is over limit (%dms), scan skipped\n",
 676                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 677                         ret = -1;
 678                         break;
 679                 }
 680
 681                 priv->adapter->scan_channels = start_chan;
 682
 683                 /* Send the scan command to the firmware with the specified
 684                    cfg */
 685                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 686                                              HostCmd_ACT_GEN_SET, 0,
 687                                              scan_cfg_out);
 688                 if (ret)
 689                         break;
 690         }
 691
 692         if (ret)
 693                 return -1;
 694
 695         return 0;
 696 }
 697
 698 /*
 699  * This function constructs a scan command configuration structure to use
 700  * in scan commands.
 701  *
 702  * Application layer or other functions can invoke network scanning
 703  * with a scan configuration supplied in a user scan configuration structure.
 704  * This structure is used as the basis of one or many scan command configuration
 705  * commands that are sent to the command processing module and eventually to the
 706  * firmware.
 707  *
 708  * This function creates a scan command configuration structure  based on the
 709  * following user supplied parameters (if present):
 710  *      - SSID filter
 711  *      - BSSID filter
 712  *      - Number of Probes to be sent
 713  *      - Channel list
 714  *
 715  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 716  * If the number of probes is not set, adapter default setting is used.
 717  */
 718 static void
 719 mwifiex_config_scan(struct mwifiex_private *priv,
 720                     const struct mwifiex_user_scan_cfg *user_scan_in,
 721                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 722                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 723                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 724                     u8 *max_chan_per_scan, u8 *filtered_scan,
 725                     u8 *scan_current_only)
 726 {
 727         struct mwifiex_adapter *adapter = priv->adapter;
 728         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 729         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 730         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 731         u8 *tlv_pos;
 732         u32 num_probes;
 733         u32 ssid_len;
 734         u32 chan_idx;
 735         u32 chan_num;
 736         u32 scan_type;
 737         u16 scan_dur;
 738         u8 channel;
 739         u8 radio_type;
 740         int i;
 741         u8 ssid_filter;
 742         u8 rates[MWIFIEX_SUPPORTED_RATES];
 743         u32 rates_size;
 744         struct mwifiex_ie_types_htcap *ht_cap;
 745
 746         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 747            in this routine will be preserved since the routine that sends the
 748            command will append channelTLVs at *chan_list_out.  The difference
 749            between the *chan_list_out and the tlv_buf start will be used to
 750            calculate the size of anything we add in this routine. */
 751         scan_cfg_out->tlv_buf_len = 0;
 752
 753         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 754            so later routines know where channels can be added to the command
 755            buf */
 756         tlv_pos = scan_cfg_out->tlv_buf;
 757
 758         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 759            below if a SSID or BSSID filter is sent in the command */
 760         *filtered_scan = false;
 761
 762         /* Initialize the scan as not being only on the current channel.  If
 763            the channel list is customized, only contains one channel, and is
 764            the active channel, this is set true and data flow is not halted. */
 765         *scan_current_only = false;
 766
 767         if (user_scan_in) {
 768
 769                 /* Default the ssid_filter flag to TRUE, set false under
 770                    certain wildcard conditions and qualified by the existence
 771                    of an SSID list before marking the scan as filtered */
 772                 ssid_filter = true;
 773
 774                 /* Set the BSS type scan filter, use Adapter setting if
 775                    unset */
 776                 scan_cfg_out->bss_mode =
 777                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 778                          bss_mode : (u8) adapter->scan_mode);
 779
 780                 /* Set the number of probes to send, use Adapter setting
 781                    if unset */
 782                 num_probes =
 783                         (user_scan_in->num_probes ? user_scan_in->
 784                          num_probes : adapter->scan_probes);
 785
 786                 /*
 787                  * Set the BSSID filter to the incoming configuration,
 788                  * if non-zero.  If not set, it will remain disabled
 789                  * (all zeros).
 790                  */
 791                 memcpy(scan_cfg_out->specific_bssid,
 792                        user_scan_in->specific_bssid,
 793                        sizeof(scan_cfg_out->specific_bssid));
 794
 795                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 796                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 797
 798                         wildcard_ssid_tlv =
 799                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 800                                 tlv_pos;
 801                         wildcard_ssid_tlv->header.type =
 802                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 803                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 804                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 805                                                          max_ssid_length)));
 806
 807                         /*
 808                          * max_ssid_length = 0 tells firmware to perform
 809                          * specific scan for the SSID filled, whereas
 810                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 811                          * wildcard scan.
 812                          */
 813                         if (ssid_len)
 814                                 wildcard_ssid_tlv->max_ssid_length = 0;
 815                         else
 816                                 wildcard_ssid_tlv->max_ssid_length =
 817                                                         IEEE80211_MAX_SSID_LEN;
 818
 819                         memcpy(wildcard_ssid_tlv->ssid,
 820                                user_scan_in->ssid_list[i].ssid, ssid_len);
 821
 822                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 823                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 824
 825                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 826                                 i, wildcard_ssid_tlv->ssid,
 827                                 wildcard_ssid_tlv->max_ssid_length);
 828
 829                         /* Empty wildcard ssid with a maxlen will match many or
 830                            potentially all SSIDs (maxlen == 32), therefore do
 831                            not treat the scan as
 832                            filtered. */
 833                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 834                                 ssid_filter = false;
 835                 }
 836
 837                 /*
 838                  *  The default number of channels sent in the command is low to
 839                  *  ensure the response buffer from the firmware does not
 840                  *  truncate scan results.  That is not an issue with an SSID
 841                  *  or BSSID filter applied to the scan results in the firmware.
 842                  */
 843                 if ((i && ssid_filter) ||
 844                     !is_zero_ether_addr(scan_cfg_out->specific_bssid))
 845                         *filtered_scan = true;
 846         } else {
 847                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 848                 num_probes = adapter->scan_probes;
 849         }
 850
 851         /*
 852          *  If a specific BSSID or SSID is used, the number of channels in the
 853          *  scan command will be increased to the absolute maximum.
 854          */
 855         if (*filtered_scan)
 856                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 857         else
 858                 *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
 859
 860         /* If the input config or adapter has the number of Probes set,
 861            add tlv */
 862         if (num_probes) {
 863
 864                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 865                         num_probes);
 866
 867                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 868                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 869                 num_probes_tlv->header.len =
 870                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 871                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 872
 873                 tlv_pos += sizeof(num_probes_tlv->header) +
 874                         le16_to_cpu(num_probes_tlv->header.len);
 875
 876         }
 877
 878         /* Append rates tlv */
 879         memset(rates, 0, sizeof(rates));
 880
 881         rates_size = mwifiex_get_supported_rates(priv, rates);
 882
 883         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 884         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 885         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 886         memcpy(rates_tlv->rates, rates, rates_size);
 887         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 888
 889         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 890
 891         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 892             (priv->adapter->config_bands & BAND_GN ||
 893              priv->adapter->config_bands & BAND_AN)) {
 894                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 895                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 896                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 897                 ht_cap->header.len =
 898                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 899                 radio_type =
 900                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 901                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 902                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 903         }
 904
 905         /* Append vendor specific IE TLV */
 906         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 907
 908         /*
 909          * Set the output for the channel TLV to the address in the tlv buffer
 910          *   past any TLVs that were added in this function (SSID, num_probes).
 911          *   Channel TLVs will be added past this for each scan command,
 912          *   preserving the TLVs that were previously added.
 913          */
 914         *chan_list_out =
 915                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 916
 917         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 918
 919                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 920
 921                 for (chan_idx = 0;
 922                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
 923                      user_scan_in->chan_list[chan_idx].chan_number;
 924                      chan_idx++) {
 925
 926                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 927                         (scan_chan_list + chan_idx)->chan_number = channel;
 928
 929                         radio_type =
 930                                 user_scan_in->chan_list[chan_idx].radio_type;
 931                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 932
 933                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 934
 935                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 936                                 (scan_chan_list +
 937                                  chan_idx)->chan_scan_mode_bitmap
 938                                         |= MWIFIEX_PASSIVE_SCAN;
 939                         else
 940                                 (scan_chan_list +
 941                                  chan_idx)->chan_scan_mode_bitmap
 942                                         &= ~MWIFIEX_PASSIVE_SCAN;
 943
 944                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 945                                 scan_dur = (u16) user_scan_in->
 946                                         chan_list[chan_idx].scan_time;
 947                         } else {
 948                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 949                                         scan_dur = adapter->passive_scan_time;
 950                                 else if (*filtered_scan)
 951                                         scan_dur = adapter->specific_scan_time;
 952                                 else
 953                                         scan_dur = adapter->active_scan_time;
 954                         }
 955
 956                         (scan_chan_list + chan_idx)->min_scan_time =
 957                                 cpu_to_le16(scan_dur);
 958                         (scan_chan_list + chan_idx)->max_scan_time =
 959                                 cpu_to_le16(scan_dur);
 960                 }
 961
 962                 /* Check if we are only scanning the current channel */
 963                 if ((chan_idx == 1) &&
 964                     (user_scan_in->chan_list[0].chan_number ==
 965                      priv->curr_bss_params.bss_descriptor.channel)) {
 966                         *scan_current_only = true;
 967                         dev_dbg(adapter->dev,
 968                                 "info: Scan: Scanning current channel only\n");
 969                 }
 970                 chan_num = chan_idx;
 971         } else {
 972                 dev_dbg(adapter->dev,
 973                         "info: Scan: Creating full region channel list\n");
 974                 chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
 975                                                             scan_chan_list,
 976                                                             *filtered_scan);
 977         }
 978
 979         /*
 980          * In associated state we will reduce the number of channels scanned per
 981          * scan command to avoid any traffic delay/loss. This number is decided
 982          * based on total number of channels to be scanned due to constraints
 983          * of command buffers.
 984          */
 985         if (priv->media_connected) {
 986                 if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
 987                         *max_chan_per_scan = 1;
 988                 else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
 989                         *max_chan_per_scan = 2;
 990                 else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
 991                         *max_chan_per_scan = 3;
 992                 else
 993                         *max_chan_per_scan = 4;
 994         }
 995 }
 996
 997 /*
 998  * This function inspects the scan response buffer for pointers to
 999  * expected TLVs.
1000  *
1001  * TLVs can be included at the end of the scan response BSS information.
1002  *
1003  * Data in the buffer is parsed pointers to TLVs that can potentially
1004  * be passed back in the response.
1005  */
1006 static void
1007 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1008                                      struct mwifiex_ie_types_data *tlv,
1009                                      u32 tlv_buf_size, u32 req_tlv_type,
1010                                      struct mwifiex_ie_types_data **tlv_data)
1011 {
1012         struct mwifiex_ie_types_data *current_tlv;
1013         u32 tlv_buf_left;
1014         u32 tlv_type;
1015         u32 tlv_len;
1016
1017         current_tlv = tlv;
1018         tlv_buf_left = tlv_buf_size;
1019         *tlv_data = NULL;
1020
1021         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1022                 tlv_buf_size);
1023
1024         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1025
1026                 tlv_type = le16_to_cpu(current_tlv->header.type);
1027                 tlv_len = le16_to_cpu(current_tlv->header.len);
1028
1029                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1030                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1031                         break;
1032                 }
1033
1034                 if (req_tlv_type == tlv_type) {
1035                         switch (tlv_type) {
1036                         case TLV_TYPE_TSFTIMESTAMP:
1037                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1038                                         "timestamp TLV, len = %d\n", tlv_len);
1039                                 *tlv_data = current_tlv;
1040                                 break;
1041                         case TLV_TYPE_CHANNELBANDLIST:
1042                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1043                                         " band list TLV, len = %d\n", tlv_len);
1044                                 *tlv_data = current_tlv;
1045                                 break;
1046                         default:
1047                                 dev_err(adapter->dev,
1048                                         "SCAN_RESP: unhandled TLV = %d\n",
1049                                        tlv_type);
1050                                 /* Give up, this seems corrupted */
1051                                 return;
1052                         }
1053                 }
1054
1055                 if (*tlv_data)
1056                         break;
1057
1058
1059                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1060                 current_tlv =
1061                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1062                                                           tlv_len);
1063
1064         }                       /* while */
1065 }
1066
1067 /*
1068  * This function parses provided beacon buffer and updates
1069  * respective fields in bss descriptor structure.
1070  */
1071 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1072                                     struct mwifiex_bssdescriptor *bss_entry)
1073 {
1074         int ret = 0;
1075         u8 element_id;
1076         struct ieee_types_fh_param_set *fh_param_set;
1077         struct ieee_types_ds_param_set *ds_param_set;
1078         struct ieee_types_cf_param_set *cf_param_set;
1079         struct ieee_types_ibss_param_set *ibss_param_set;
1080         u8 *current_ptr;
1081         u8 *rate;
1082         u8 element_len;
1083         u16 total_ie_len;
1084         u8 bytes_to_copy;
1085         u8 rate_size;
1086         u8 found_data_rate_ie;
1087         u32 bytes_left;
1088         struct ieee_types_vendor_specific *vendor_ie;
1089         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1090         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1091
1092         found_data_rate_ie = false;
1093         rate_size = 0;
1094         current_ptr = bss_entry->beacon_buf;
1095         bytes_left = bss_entry->beacon_buf_size;
1096
1097         /* Process variable IE */
1098         while (bytes_left >= 2) {
1099                 element_id = *current_ptr;
1100                 element_len = *(current_ptr + 1);
1101                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1102
1103                 if (bytes_left < total_ie_len) {
1104                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1105                                 " IE, bytes left < IE length\n");
1106                         return -1;
1107                 }
1108                 switch (element_id) {
1109                 case WLAN_EID_SSID:
1110                         bss_entry->ssid.ssid_len = element_len;
1111                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1112                                element_len);
1113                         dev_dbg(adapter->dev,
1114                                 "info: InterpretIE: ssid: %-32s\n",
1115                                 bss_entry->ssid.ssid);
1116                         break;
1117
1118                 case WLAN_EID_SUPP_RATES:
1119                         memcpy(bss_entry->data_rates, current_ptr + 2,
1120                                element_len);
1121                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1122                                element_len);
1123                         rate_size = element_len;
1124                         found_data_rate_ie = true;
1125                         break;
1126
1127                 case WLAN_EID_FH_PARAMS:
1128                         fh_param_set =
1129                                 (struct ieee_types_fh_param_set *) current_ptr;
1130                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1131                                fh_param_set,
1132                                sizeof(struct ieee_types_fh_param_set));
1133                         break;
1134
1135                 case WLAN_EID_DS_PARAMS:
1136                         ds_param_set =
1137                                 (struct ieee_types_ds_param_set *) current_ptr;
1138
1139                         bss_entry->channel = ds_param_set->current_chan;
1140
1141                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1142                                ds_param_set,
1143                                sizeof(struct ieee_types_ds_param_set));
1144                         break;
1145
1146                 case WLAN_EID_CF_PARAMS:
1147                         cf_param_set =
1148                                 (struct ieee_types_cf_param_set *) current_ptr;
1149                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1150                                cf_param_set,
1151                                sizeof(struct ieee_types_cf_param_set));
1152                         break;
1153
1154                 case WLAN_EID_IBSS_PARAMS:
1155                         ibss_param_set =
1156                                 (struct ieee_types_ibss_param_set *)
1157                                 current_ptr;
1158                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1159                                ibss_param_set,
1160                                sizeof(struct ieee_types_ibss_param_set));
1161                         break;
1162
1163                 case WLAN_EID_ERP_INFO:
1164                         bss_entry->erp_flags = *(current_ptr + 2);
1165                         break;
1166
1167                 case WLAN_EID_EXT_SUPP_RATES:
1168                         /*
1169                          * Only process extended supported rate
1170                          * if data rate is already found.
1171                          * Data rate IE should come before
1172                          * extended supported rate IE
1173                          */
1174                         if (found_data_rate_ie) {
1175                                 if ((element_len + rate_size) >
1176                                     MWIFIEX_SUPPORTED_RATES)
1177                                         bytes_to_copy =
1178                                                 (MWIFIEX_SUPPORTED_RATES -
1179                                                  rate_size);
1180                                 else
1181                                         bytes_to_copy = element_len;
1182
1183                                 rate = (u8 *) bss_entry->data_rates;
1184                                 rate += rate_size;
1185                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1186
1187                                 rate = (u8 *) bss_entry->supported_rates;
1188                                 rate += rate_size;
1189                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1190                         }
1191                         break;
1192
1193                 case WLAN_EID_VENDOR_SPECIFIC:
1194                         vendor_ie = (struct ieee_types_vendor_specific *)
1195                                         current_ptr;
1196
1197                         if (!memcmp
1198                             (vendor_ie->vend_hdr.oui, wpa_oui,
1199                              sizeof(wpa_oui))) {
1200                                 bss_entry->bcn_wpa_ie =
1201                                         (struct ieee_types_vendor_specific *)
1202                                         current_ptr;
1203                                 bss_entry->wpa_offset = (u16)
1204                                         (current_ptr - bss_entry->beacon_buf);
1205                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1206                                     sizeof(wmm_oui))) {
1207                                 if (total_ie_len ==
1208                                     sizeof(struct ieee_types_wmm_parameter) ||
1209                                     total_ie_len ==
1210                                     sizeof(struct ieee_types_wmm_info))
1211                                         /*
1212                                          * Only accept and copy the WMM IE if
1213                                          * it matches the size expected for the
1214                                          * WMM Info IE or the WMM Parameter IE.
1215                                          */
1216                                         memcpy((u8 *) &bss_entry->wmm_ie,
1217                                                current_ptr, total_ie_len);
1218                         }
1219                         break;
1220                 case WLAN_EID_RSN:
1221                         bss_entry->bcn_rsn_ie =
1222                                 (struct ieee_types_generic *) current_ptr;
1223                         bss_entry->rsn_offset = (u16) (current_ptr -
1224                                                         bss_entry->beacon_buf);
1225                         break;
1226                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1227                         bss_entry->bcn_wapi_ie =
1228                                 (struct ieee_types_generic *) current_ptr;
1229                         bss_entry->wapi_offset = (u16) (current_ptr -
1230                                                         bss_entry->beacon_buf);
1231                         break;
1232                 case WLAN_EID_HT_CAPABILITY:
1233                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1234                                         (current_ptr +
1235                                         sizeof(struct ieee_types_header));
1236                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1237                                         sizeof(struct ieee_types_header) -
1238                                         bss_entry->beacon_buf);
1239                         break;
1240                 case WLAN_EID_HT_OPERATION:
1241                         bss_entry->bcn_ht_oper =
1242                                 (struct ieee80211_ht_operation *)(current_ptr +
1243                                         sizeof(struct ieee_types_header));
1244                         bss_entry->ht_info_offset = (u16) (current_ptr +
1245                                         sizeof(struct ieee_types_header) -
1246                                         bss_entry->beacon_buf);
1247                         break;
1248                 case WLAN_EID_BSS_COEX_2040:
1249                         bss_entry->bcn_bss_co_2040 = current_ptr +
1250                                 sizeof(struct ieee_types_header);
1251                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1252                                         sizeof(struct ieee_types_header) -
1253                                                 bss_entry->beacon_buf);
1254                         break;
1255                 case WLAN_EID_EXT_CAPABILITY:
1256                         bss_entry->bcn_ext_cap = current_ptr +
1257                                 sizeof(struct ieee_types_header);
1258                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1259                                         sizeof(struct ieee_types_header) -
1260                                         bss_entry->beacon_buf);
1261                         break;
1262                 default:
1263                         break;
1264                 }
1265
1266                 current_ptr += element_len + 2;
1267
1268                 /* Need to account for IE ID and IE Len */
1269                 bytes_left -= (element_len + 2);
1270
1271         }       /* while (bytes_left > 2) */
1272         return ret;
1273 }
1274
1275 /*
1276  * This function converts radio type scan parameter to a band configuration
1277  * to be used in join command.
1278  */
1279 static u8
1280 mwifiex_radio_type_to_band(u8 radio_type)
1281 {
1282         switch (radio_type) {
1283         case HostCmd_SCAN_RADIO_TYPE_A:
1284                 return BAND_A;
1285         case HostCmd_SCAN_RADIO_TYPE_BG:
1286         default:
1287                 return BAND_G;
1288         }
1289 }
1290
1291 /*
1292  * This is an internal function used to start a scan based on an input
1293  * configuration.
1294  *
1295  * This uses the input user scan configuration information when provided in
1296  * order to send the appropriate scan commands to firmware to populate or
1297  * update the internal driver scan table.
1298  */
1299 int mwifiex_scan_networks(struct mwifiex_private *priv,
1300                           const struct mwifiex_user_scan_cfg *user_scan_in)
1301 {
1302         int ret;
1303         struct mwifiex_adapter *adapter = priv->adapter;
1304         struct cmd_ctrl_node *cmd_node;
1305         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1306         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1307         u32 buf_size;
1308         struct mwifiex_chan_scan_param_set *scan_chan_list;
1309         u8 filtered_scan;
1310         u8 scan_current_chan_only;
1311         u8 max_chan_per_scan;
1312         unsigned long flags;
1313
1314         if (adapter->scan_processing) {
1315                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1316                 return -EBUSY;
1317         }
1318
1319         if (priv->scan_block) {
1320                 dev_err(adapter->dev,
1321                         "cmd: Scan is blocked during association...\n");
1322                 return -EBUSY;
1323         }
1324
1325         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1326         adapter->scan_processing = true;
1327         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1328
1329         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1330                                                                 GFP_KERNEL);
1331         if (!scan_cfg_out) {
1332                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1333                 ret = -ENOMEM;
1334                 goto done;
1335         }
1336
1337         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1338                                                 MWIFIEX_USER_SCAN_CHAN_MAX;
1339         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1340         if (!scan_chan_list) {
1341                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1342                 kfree(scan_cfg_out);
1343                 ret = -ENOMEM;
1344                 goto done;
1345         }
1346
1347         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1348                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1349                             &filtered_scan, &scan_current_chan_only);
1350
1351         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1352                                         &scan_cfg_out->config, chan_list_out,
1353                                         scan_chan_list);
1354
1355         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1356         if (!ret) {
1357                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1358                 if (!list_empty(&adapter->scan_pending_q)) {
1359                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1360                                                     struct cmd_ctrl_node, list);
1361                         list_del(&cmd_node->list);
1362                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1363                                                flags);
1364                         adapter->cmd_queued = cmd_node;
1365                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1366                                                         true);
1367                         queue_work(adapter->workqueue, &adapter->main_work);
1368                 } else {
1369                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1370                                                flags);
1371                 }
1372         }
1373
1374         kfree(scan_cfg_out);
1375         kfree(scan_chan_list);
1376 done:
1377         if (ret) {
1378                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1379                 adapter->scan_processing = false;
1380                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1381         }
1382         return ret;
1383 }
1384
1385 /*
1386  * This function prepares a scan command to be sent to the firmware.
1387  *
1388  * This uses the scan command configuration sent to the command processing
1389  * module in command preparation stage to configure a scan command structure
1390  * to send to firmware.
1391  *
1392  * The fixed fields specifying the BSS type and BSSID filters as well as a
1393  * variable number/length of TLVs are sent in the command to firmware.
1394  *
1395  * Preparation also includes -
1396  *      - Setting command ID, and proper size
1397  *      - Ensuring correct endian-ness
1398  */
1399 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1400                             struct mwifiex_scan_cmd_config *scan_cfg)
1401 {
1402         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1403
1404         /* Set fixed field variables in scan command */
1405         scan_cmd->bss_mode = scan_cfg->bss_mode;
1406         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1407                sizeof(scan_cmd->bssid));
1408         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1409
1410         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1411
1412         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1413         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1414                                           + sizeof(scan_cmd->bssid)
1415                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1416
1417         return 0;
1418 }
1419
1420 /*
1421  * This function checks compatibility of requested network with current
1422  * driver settings.
1423  */
1424 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1425                                         struct mwifiex_bssdescriptor *bss_desc)
1426 {
1427         int ret = -1;
1428
1429         if (!bss_desc)
1430                 return -1;
1431
1432         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1433                              (u16) bss_desc->channel, 0))) {
1434                 switch (priv->bss_mode) {
1435                 case NL80211_IFTYPE_STATION:
1436                 case NL80211_IFTYPE_ADHOC:
1437                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1438                                                             priv->bss_mode);
1439                         if (ret)
1440                                 dev_err(priv->adapter->dev,
1441                                         "Incompatible network settings\n");
1442                         break;
1443                 default:
1444                         ret = 0;
1445                 }
1446         }
1447
1448         return ret;
1449 }
1450
1451 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1452                                           struct cfg80211_bss *bss)
1453 {
1454         struct mwifiex_bssdescriptor *bss_desc;
1455         int ret;
1456         unsigned long flags;
1457
1458         /* Allocate and fill new bss descriptor */
1459         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1460                         GFP_KERNEL);
1461         if (!bss_desc) {
1462                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1463                 return -ENOMEM;
1464         }
1465
1466         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1467         if (ret)
1468                 goto done;
1469
1470         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1471         if (ret)
1472                 goto done;
1473
1474         /* Update current bss descriptor parameters */
1475         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1476         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1477         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1478         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1479         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1480         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1481         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1482         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1483         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1484                 0;
1485         priv->curr_bss_params.bss_descriptor.bcn_ht_oper = NULL;
1486         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1487                 0;
1488         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1489                 NULL;
1490         priv->curr_bss_params.bss_descriptor.
1491                 bss_co_2040_offset = 0;
1492         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1493         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1494         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1495         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1496                 0;
1497
1498         /* Make a copy of current BSSID descriptor */
1499         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1500                sizeof(priv->curr_bss_params.bss_descriptor));
1501         mwifiex_save_curr_bcn(priv);
1502         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1503
1504 done:
1505         kfree(bss_desc);
1506         return 0;
1507 }
1508
1509 /*
1510  * This function handles the command response of scan.
1511  *
1512  * The response buffer for the scan command has the following
1513  * memory layout:
1514  *
1515  *      .-------------------------------------------------------------.
1516  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1517  *      .-------------------------------------------------------------.
1518  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1519  *      .-------------------------------------------------------------.
1520  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1521  *      .-------------------------------------------------------------.
1522  *      |  BSSDescription data (variable, size given in BufSize)      |
1523  *      .-------------------------------------------------------------.
1524  *      |  TLV data (variable, size calculated using Header->Size,    |
1525  *      |            BufSize and sizeof the fixed fields above)       |
1526  *      .-------------------------------------------------------------.
1527  */
1528 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1529                             struct host_cmd_ds_command *resp)
1530 {
1531         int ret = 0;
1532         struct mwifiex_adapter *adapter = priv->adapter;
1533         struct cmd_ctrl_node *cmd_node;
1534         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1535         struct mwifiex_ie_types_data *tlv_data;
1536         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1537         u8 *bss_info;
1538         u32 scan_resp_size;
1539         u32 bytes_left;
1540         u32 idx;
1541         u32 tlv_buf_size;
1542         struct mwifiex_chan_freq_power *cfp;
1543         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1544         struct chan_band_param_set *chan_band;
1545         u8 is_bgscan_resp;
1546         unsigned long flags;
1547         struct cfg80211_bss *bss;
1548
1549         is_bgscan_resp = (le16_to_cpu(resp->command)
1550                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1551         if (is_bgscan_resp)
1552                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1553         else
1554                 scan_rsp = &resp->params.scan_resp;
1555
1556
1557         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1558                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1559                         scan_rsp->number_of_sets);
1560                 ret = -1;
1561                 goto done;
1562         }
1563
1564         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1565         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1566                 bytes_left);
1567
1568         scan_resp_size = le16_to_cpu(resp->size);
1569
1570         dev_dbg(adapter->dev,
1571                 "info: SCAN_RESP: returned %d APs before parsing\n",
1572                 scan_rsp->number_of_sets);
1573
1574         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1575
1576         /*
1577          * The size of the TLV buffer is equal to the entire command response
1578          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1579          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1580          *   response header (S_DS_GEN)
1581          */
1582         tlv_buf_size = scan_resp_size - (bytes_left
1583                                          + sizeof(scan_rsp->bss_descript_size)
1584                                          + sizeof(scan_rsp->number_of_sets)
1585                                          + S_DS_GEN);
1586
1587         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1588                                                  bss_desc_and_tlv_buffer +
1589                                                  bytes_left);
1590
1591         /* Search the TLV buffer space in the scan response for any valid
1592            TLVs */
1593         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1594                                              TLV_TYPE_TSFTIMESTAMP,
1595                                              (struct mwifiex_ie_types_data **)
1596                                              &tsf_tlv);
1597
1598         /* Search the TLV buffer space in the scan response for any valid
1599            TLVs */
1600         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1601                                              TLV_TYPE_CHANNELBANDLIST,
1602                                              (struct mwifiex_ie_types_data **)
1603                                              &chan_band_tlv);
1604
1605         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1606                 u8 bssid[ETH_ALEN];
1607                 s32 rssi;
1608                 const u8 *ie_buf;
1609                 size_t ie_len;
1610                 u16 channel = 0;
1611                 u64 fw_tsf = 0;
1612                 u16 beacon_size = 0;
1613                 u32 curr_bcn_bytes;
1614                 u32 freq;
1615                 u16 beacon_period;
1616                 u16 cap_info_bitmap;
1617                 u8 *current_ptr;
1618                 u64 timestamp;
1619                 struct mwifiex_bcn_param *bcn_param;
1620                 struct mwifiex_bss_priv *bss_priv;
1621
1622                 if (bytes_left >= sizeof(beacon_size)) {
1623                         /* Extract & convert beacon size from command buffer */
1624                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1625                         bytes_left -= sizeof(beacon_size);
1626                         bss_info += sizeof(beacon_size);
1627                 }
1628
1629                 if (!beacon_size || beacon_size > bytes_left) {
1630                         bss_info += bytes_left;
1631                         bytes_left = 0;
1632                         return -1;
1633                 }
1634
1635                 /* Initialize the current working beacon pointer for this BSS
1636                  * iteration */
1637                 current_ptr = bss_info;
1638
1639                 /* Advance the return beacon pointer past the current beacon */
1640                 bss_info += beacon_size;
1641                 bytes_left -= beacon_size;
1642
1643                 curr_bcn_bytes = beacon_size;
1644
1645                 /*
1646                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1647                  *   and capability information
1648                  */
1649                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1650                         dev_err(adapter->dev,
1651                                 "InterpretIE: not enough bytes left\n");
1652                         continue;
1653                 }
1654                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1655                 current_ptr += sizeof(*bcn_param);
1656                 curr_bcn_bytes -= sizeof(*bcn_param);
1657
1658                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1659
1660                 rssi = (s32) bcn_param->rssi;
1661                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1662                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1663
1664                 timestamp = le64_to_cpu(bcn_param->timestamp);
1665                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1666
1667                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1668                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1669                         cap_info_bitmap);
1670
1671                 /* Rest of the current buffer are IE's */
1672                 ie_buf = current_ptr;
1673                 ie_len = curr_bcn_bytes;
1674                 dev_dbg(adapter->dev,
1675                         "info: InterpretIE: IELength for this AP = %d\n",
1676                         curr_bcn_bytes);
1677
1678                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1679                         u8 element_id, element_len;
1680
1681                         element_id = *current_ptr;
1682                         element_len = *(current_ptr + 1);
1683                         if (curr_bcn_bytes < element_len +
1684                                         sizeof(struct ieee_types_header)) {
1685                                 dev_err(priv->adapter->dev,
1686                                         "%s: bytes left < IE length\n",
1687                                         __func__);
1688                                 goto done;
1689                         }
1690                         if (element_id == WLAN_EID_DS_PARAMS) {
1691                                 channel = *(current_ptr + sizeof(struct ieee_types_header));
1692                                 break;
1693                         }
1694
1695                         current_ptr += element_len +
1696                                         sizeof(struct ieee_types_header);
1697                         curr_bcn_bytes -= element_len +
1698                                         sizeof(struct ieee_types_header);
1699                 }
1700
1701                 /*
1702                  * If the TSF TLV was appended to the scan results, save this
1703                  * entry's TSF value in the fw_tsf field. It is the firmware's
1704                  * TSF value at the time the beacon or probe response was
1705                  * received.
1706                  */
1707                 if (tsf_tlv)
1708                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1709                                sizeof(fw_tsf));
1710
1711                 if (channel) {
1712                         struct ieee80211_channel *chan;
1713                         u8 band;
1714
1715                         band = BAND_G;
1716                         if (chan_band_tlv) {
1717                                 chan_band =
1718                                         &chan_band_tlv->chan_band_param[idx];
1719                                 band = mwifiex_radio_type_to_band(
1720                                                 chan_band->radio_type
1721                                                 & (BIT(0) | BIT(1)));
1722                         }
1723
1724                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1725
1726                         freq = cfp ? cfp->freq : 0;
1727
1728                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1729
1730                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1731                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1732                                               chan, bssid, timestamp,
1733                                               cap_info_bitmap, beacon_period,
1734                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1735                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1736                                 bss_priv->band = band;
1737                                 bss_priv->fw_tsf = fw_tsf;
1738                                 if (priv->media_connected &&
1739                                     !memcmp(bssid,
1740                                             priv->curr_bss_params.bss_descriptor
1741                                             .mac_address, ETH_ALEN))
1742                                         mwifiex_update_curr_bss_params(priv,
1743                                                                        bss);
1744                                 cfg80211_put_bss(bss);
1745                         }
1746                 } else {
1747                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1748                 }
1749         }
1750
1751         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1752         if (list_empty(&adapter->scan_pending_q)) {
1753                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1754                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1755                 adapter->scan_processing = false;
1756                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1757
1758                 /* Need to indicate IOCTL complete */
1759                 if (adapter->curr_cmd->wait_q_enabled) {
1760                         adapter->cmd_wait_q.status = 0;
1761                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1762                 }
1763                 if (priv->report_scan_result)
1764                         priv->report_scan_result = false;
1765
1766                 if (priv->user_scan_cfg) {
1767                         if (priv->scan_request) {
1768                                 dev_dbg(priv->adapter->dev,
1769                                         "info: notifying scan done\n");
1770                                 cfg80211_scan_done(priv->scan_request, 0);
1771                                 priv->scan_request = NULL;
1772                         } else {
1773                                 dev_dbg(priv->adapter->dev,
1774                                         "info: scan already aborted\n");
1775                         }
1776
1777                         kfree(priv->user_scan_cfg);
1778                         priv->user_scan_cfg = NULL;
1779                 }
1780         } else {
1781                 if (priv->user_scan_cfg && !priv->scan_request) {
1782                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1783                                                flags);
1784                         adapter->scan_delay_cnt = MWIFIEX_MAX_SCAN_DELAY_CNT;
1785                         mod_timer(&priv->scan_delay_timer, jiffies);
1786                         dev_dbg(priv->adapter->dev,
1787                                 "info: %s: triggerring scan abort\n", __func__);
1788                 } else if (!mwifiex_wmm_lists_empty(adapter) &&
1789                            (priv->scan_request && (priv->scan_request->flags &
1790                                             NL80211_SCAN_FLAG_LOW_PRIORITY))) {
1791                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1792                                                flags);
1793                         adapter->scan_delay_cnt = 1;
1794                         mod_timer(&priv->scan_delay_timer, jiffies +
1795                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
1796                         dev_dbg(priv->adapter->dev,
1797                                 "info: %s: deferring scan\n", __func__);
1798                 } else {
1799                         /* Get scan command from scan_pending_q and put to
1800                            cmd_pending_q */
1801                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1802                                                     struct cmd_ctrl_node, list);
1803                         list_del(&cmd_node->list);
1804                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1805                                                flags);
1806                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1807                                                         true);
1808                 }
1809         }
1810
1811 done:
1812         return ret;
1813 }
1814
1815 /*
1816  * This function prepares command for background scan query.
1817  *
1818  * Preparation includes -
1819  *      - Setting command ID and proper size
1820  *      - Setting background scan flush parameter
1821  *      - Ensuring correct endian-ness
1822  */
1823 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1824 {
1825         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1826                 &cmd->params.bg_scan_query;
1827
1828         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1829         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1830                                 + S_DS_GEN);
1831
1832         bg_query->flush = 1;
1833
1834         return 0;
1835 }
1836
1837 /*
1838  * This function inserts scan command node to the scan pending queue.
1839  */
1840 void
1841 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1842                        struct cmd_ctrl_node *cmd_node)
1843 {
1844         struct mwifiex_adapter *adapter = priv->adapter;
1845         unsigned long flags;
1846
1847         cmd_node->wait_q_enabled = true;
1848         cmd_node->condition = &adapter->scan_wait_q_woken;
1849         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1850         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1851         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1852 }
1853
1854 /*
1855  * This function sends a scan command for all available channels to the
1856  * firmware, filtered on a specific SSID.
1857  */
1858 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1859                                       struct cfg80211_ssid *req_ssid)
1860 {
1861         struct mwifiex_adapter *adapter = priv->adapter;
1862         int ret = 0;
1863         struct mwifiex_user_scan_cfg *scan_cfg;
1864
1865         if (!req_ssid)
1866                 return -1;
1867
1868         if (adapter->scan_processing) {
1869                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1870                 return ret;
1871         }
1872
1873         if (priv->scan_block) {
1874                 dev_dbg(adapter->dev,
1875                         "cmd: Scan is blocked during association...\n");
1876                 return ret;
1877         }
1878
1879         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1880         if (!scan_cfg) {
1881                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1882                 return -ENOMEM;
1883         }
1884
1885         scan_cfg->ssid_list = req_ssid;
1886         scan_cfg->num_ssids = 1;
1887
1888         ret = mwifiex_scan_networks(priv, scan_cfg);
1889
1890         kfree(scan_cfg);
1891         return ret;
1892 }
1893
1894 /*
1895  * Sends IOCTL request to start a scan.
1896  *
1897  * This function allocates the IOCTL request buffer, fills it
1898  * with requisite parameters and calls the IOCTL handler.
1899  *
1900  * Scan command can be issued for both normal scan and specific SSID
1901  * scan, depending upon whether an SSID is provided or not.
1902  */
1903 int mwifiex_request_scan(struct mwifiex_private *priv,
1904                          struct cfg80211_ssid *req_ssid)
1905 {
1906         int ret;
1907
1908         if (down_interruptible(&priv->async_sem)) {
1909                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1910                         __func__);
1911                 return -1;
1912         }
1913
1914         priv->adapter->scan_wait_q_woken = false;
1915
1916         if (req_ssid && req_ssid->ssid_len != 0)
1917                 /* Specific SSID scan */
1918                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1919         else
1920                 /* Normal scan */
1921                 ret = mwifiex_scan_networks(priv, NULL);
1922
1923         if (!ret)
1924                 ret = mwifiex_wait_queue_complete(priv->adapter);
1925
1926         up(&priv->async_sem);
1927
1928         return ret;
1929 }
1930
1931 /*
1932  * This function appends the vendor specific IE TLV to a buffer.
1933  */
1934 int
1935 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1936                             u16 vsie_mask, u8 **buffer)
1937 {
1938         int id, ret_len = 0;
1939         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1940
1941         if (!buffer)
1942                 return 0;
1943         if (!(*buffer))
1944                 return 0;
1945
1946         /*
1947          * Traverse through the saved vendor specific IE array and append
1948          * the selected(scan/assoc/adhoc) IE as TLV to the command
1949          */
1950         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1951                 if (priv->vs_ie[id].mask & vsie_mask) {
1952                         vs_param_set =
1953                                 (struct mwifiex_ie_types_vendor_param_set *)
1954                                 *buffer;
1955                         vs_param_set->header.type =
1956                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1957                         vs_param_set->header.len =
1958                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1959                                 & 0x00FF) + 2);
1960                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1961                                le16_to_cpu(vs_param_set->header.len));
1962                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1963                                    sizeof(struct mwifiex_ie_types_header);
1964                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1965                                    sizeof(struct mwifiex_ie_types_header);
1966                 }
1967         }
1968         return ret_len;
1969 }
1970
1971 /*
1972  * This function saves a beacon buffer of the current BSS descriptor.
1973  *
1974  * The current beacon buffer is saved so that it can be restored in the
1975  * following cases that makes the beacon buffer not to contain the current
1976  * ssid's beacon buffer.
1977  *      - The current ssid was not found somehow in the last scan.
1978  *      - The current ssid was the last entry of the scan table and overloaded.
1979  */
1980 void
1981 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1982 {
1983         struct mwifiex_bssdescriptor *curr_bss =
1984                 &priv->curr_bss_params.bss_descriptor;
1985
1986         if (!curr_bss->beacon_buf_size)
1987                 return;
1988
1989         /* allocate beacon buffer at 1st time; or if it's size has changed */
1990         if (!priv->curr_bcn_buf ||
1991             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1992                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1993
1994                 kfree(priv->curr_bcn_buf);
1995                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1996                                              GFP_ATOMIC);
1997                 if (!priv->curr_bcn_buf) {
1998                         dev_err(priv->adapter->dev,
1999                                 "failed to alloc curr_bcn_buf\n");
2000                         return;
2001                 }
2002         }
2003
2004         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2005                curr_bss->beacon_buf_size);
2006         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2007                 priv->curr_bcn_size);
2008
2009         curr_bss->beacon_buf = priv->curr_bcn_buf;
2010
2011         /* adjust the pointers in the current BSS descriptor */
2012         if (curr_bss->bcn_wpa_ie)
2013                 curr_bss->bcn_wpa_ie =
2014                         (struct ieee_types_vendor_specific *)
2015                         (curr_bss->beacon_buf +
2016                          curr_bss->wpa_offset);
2017
2018         if (curr_bss->bcn_rsn_ie)
2019                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2020                         (curr_bss->beacon_buf +
2021                          curr_bss->rsn_offset);
2022
2023         if (curr_bss->bcn_ht_cap)
2024                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2025                         (curr_bss->beacon_buf +
2026                          curr_bss->ht_cap_offset);
2027
2028         if (curr_bss->bcn_ht_oper)
2029                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2030                         (curr_bss->beacon_buf +
2031                          curr_bss->ht_info_offset);
2032
2033         if (curr_bss->bcn_bss_co_2040)
2034                 curr_bss->bcn_bss_co_2040 =
2035                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2036
2037         if (curr_bss->bcn_ext_cap)
2038                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2039                         curr_bss->ext_cap_offset;
2040 }
2041
2042 /*
2043  * This function frees the current BSS descriptor beacon buffer.
2044  */
2045 void
2046 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2047 {
2048         kfree(priv->curr_bcn_buf);
2049         priv->curr_bcn_buf = NULL;
2050 }