drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD       4
  32 #define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD    15
  33 #define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD   27
  34 #define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD   35
  35
  36 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  37 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  38                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  39                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  40
  41 /* Memory needed to store supported rate */
  42 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  43                                 + HOSTCMD_SUPPORTED_RATES)
  44
  45 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  46         scan */
  47 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  48         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  49                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  50                         + IEEE80211_MAX_SSID_LEN))
  51
  52 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  53 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  54                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  55                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  56                                 + CHAN_TLV_MAX_SIZE                 \
  57                                 + RATE_TLV_MAX_SIZE                 \
  58                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  59
  60
  61 union mwifiex_scan_cmd_config_tlv {
  62         /* Scan configuration (variable length) */
  63         struct mwifiex_scan_cmd_config config;
  64         /* Max allocated block */
  65         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  66 };
  67
  68 enum cipher_suite {
  69         CIPHER_SUITE_TKIP,
  70         CIPHER_SUITE_CCMP,
  71         CIPHER_SUITE_MAX
  72 };
  73 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  74         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  75         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  76 };
  77 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  78         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  79         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  80 };
  81
  82 /*
  83  * This function parses a given IE for a given OUI.
  84  *
  85  * This is used to parse a WPA/RSN IE to find if it has
  86  * a given oui in PTK.
  87  */
  88 static u8
  89 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  90 {
  91         u8 count;
  92
  93         count = iebody->ptk_cnt[0];
  94
  95         /* There could be multiple OUIs for PTK hence
  96            1) Take the length.
  97            2) Check all the OUIs for AES.
  98            3) If one of them is AES then pass success. */
  99         while (count) {
 100                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
 101                         return MWIFIEX_OUI_PRESENT;
 102
 103                 --count;
 104                 if (count)
 105                         iebody = (struct ie_body *) ((u8 *) iebody +
 106                                                 sizeof(iebody->ptk_body));
 107         }
 108
 109         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 110         return MWIFIEX_OUI_NOT_PRESENT;
 111 }
 112
 113 /*
 114  * This function checks if a given OUI is present in a RSN IE.
 115  *
 116  * The function first checks if a RSN IE is present or not in the
 117  * BSS descriptor. It tries to locate the OUI only if such an IE is
 118  * present.
 119  */
 120 static u8
 121 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 122 {
 123         u8 *oui;
 124         struct ie_body *iebody;
 125         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 126
 127         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 128                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 129                 iebody = (struct ie_body *)
 130                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 131                           RSN_GTK_OUI_OFFSET);
 132                 oui = &mwifiex_rsn_oui[cipher][0];
 133                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 134                 if (ret)
 135                         return ret;
 136         }
 137         return ret;
 138 }
 139
 140 /*
 141  * This function checks if a given OUI is present in a WPA IE.
 142  *
 143  * The function first checks if a WPA IE is present or not in the
 144  * BSS descriptor. It tries to locate the OUI only if such an IE is
 145  * present.
 146  */
 147 static u8
 148 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 149 {
 150         u8 *oui;
 151         struct ie_body *iebody;
 152         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 153
 154         if (((bss_desc->bcn_wpa_ie) &&
 155              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
 156               WLAN_EID_WPA))) {
 157                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 158                 oui = &mwifiex_wpa_oui[cipher][0];
 159                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 160                 if (ret)
 161                         return ret;
 162         }
 163         return ret;
 164 }
 165
 166 /*
 167  * This function compares two SSIDs and checks if they match.
 168  */
 169 s32
 170 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 171 {
 172         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 173                 return -1;
 174         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 175 }
 176
 177 /*
 178  * This function checks if wapi is enabled in driver and scanned network is
 179  * compatible with it.
 180  */
 181 static bool
 182 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 183                     struct mwifiex_bssdescriptor *bss_desc)
 184 {
 185         if (priv->sec_info.wapi_enabled &&
 186             (bss_desc->bcn_wapi_ie &&
 187              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 188                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 /*
 195  * This function checks if driver is configured with no security mode and
 196  * scanned network is compatible with it.
 197  */
 198 static bool
 199 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 200                       struct mwifiex_bssdescriptor *bss_desc)
 201 {
 202         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 203             !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
 204                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 205                  WLAN_EID_WPA)) &&
 206             ((!bss_desc->bcn_rsn_ie) ||
 207                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 208                  WLAN_EID_RSN)) &&
 209             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 210                 return true;
 211         }
 212         return false;
 213 }
 214
 215 /*
 216  * This function checks if static WEP is enabled in driver and scanned network
 217  * is compatible with it.
 218  */
 219 static bool
 220 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 221                           struct mwifiex_bssdescriptor *bss_desc)
 222 {
 223         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 224             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 225                 return true;
 226         }
 227         return false;
 228 }
 229
 230 /*
 231  * This function checks if wpa is enabled in driver and scanned network is
 232  * compatible with it.
 233  */
 234 static bool
 235 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 236                    struct mwifiex_bssdescriptor *bss_desc)
 237 {
 238         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 239             !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
 240             ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id == WLAN_EID_WPA))
 241            /*
 242             * Privacy bit may NOT be set in some APs like
 243             * LinkSys WRT54G && bss_desc->privacy
 244             */
 245          ) {
 246                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 247                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 248                         "EncMode=%#x privacy=%#x\n", __func__,
 249                         (bss_desc->bcn_wpa_ie) ?
 250                         (*(bss_desc->bcn_wpa_ie)).
 251                         vend_hdr.element_id : 0,
 252                         (bss_desc->bcn_rsn_ie) ?
 253                         (*(bss_desc->bcn_rsn_ie)).
 254                         ieee_hdr.element_id : 0,
 255                         (priv->sec_info.wep_enabled) ? "e" : "d",
 256                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 257                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 258                         priv->sec_info.encryption_mode,
 259                         bss_desc->privacy);
 260                 return true;
 261         }
 262         return false;
 263 }
 264
 265 /*
 266  * This function checks if wpa2 is enabled in driver and scanned network is
 267  * compatible with it.
 268  */
 269 static bool
 270 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 271                     struct mwifiex_bssdescriptor *bss_desc)
 272 {
 273         if (!priv->sec_info.wep_enabled &&
 274             !priv->sec_info.wpa_enabled &&
 275             priv->sec_info.wpa2_enabled &&
 276             ((bss_desc->bcn_rsn_ie) &&
 277              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 278                 /*
 279                  * Privacy bit may NOT be set in some APs like
 280                  * LinkSys WRT54G && bss_desc->privacy
 281                  */
 282                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 283                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 284                         "EncMode=%#x privacy=%#x\n", __func__,
 285                         (bss_desc->bcn_wpa_ie) ?
 286                         (*(bss_desc->bcn_wpa_ie)).
 287                         vend_hdr.element_id : 0,
 288                         (bss_desc->bcn_rsn_ie) ?
 289                         (*(bss_desc->bcn_rsn_ie)).
 290                         ieee_hdr.element_id : 0,
 291                         (priv->sec_info.wep_enabled) ? "e" : "d",
 292                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 293                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 294                         priv->sec_info.encryption_mode,
 295                         bss_desc->privacy);
 296                 return true;
 297         }
 298         return false;
 299 }
 300
 301 /*
 302  * This function checks if adhoc AES is enabled in driver and scanned network is
 303  * compatible with it.
 304  */
 305 static bool
 306 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 307                          struct mwifiex_bssdescriptor *bss_desc)
 308 {
 309         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 310             !priv->sec_info.wpa2_enabled &&
 311             ((!bss_desc->bcn_wpa_ie) ||
 312              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 313             ((!bss_desc->bcn_rsn_ie) ||
 314              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 315             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 316                 return true;
 317         }
 318         return false;
 319 }
 320
 321 /*
 322  * This function checks if dynamic WEP is enabled in driver and scanned network
 323  * is compatible with it.
 324  */
 325 static bool
 326 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 327                            struct mwifiex_bssdescriptor *bss_desc)
 328 {
 329         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 330             !priv->sec_info.wpa2_enabled &&
 331             ((!bss_desc->bcn_wpa_ie) ||
 332              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != WLAN_EID_WPA)) &&
 333             ((!bss_desc->bcn_rsn_ie) ||
 334              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 335             priv->sec_info.encryption_mode && bss_desc->privacy) {
 336                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 337                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 338                         "EncMode=%#x privacy=%#x\n",
 339                         __func__,
 340                         (bss_desc->bcn_wpa_ie) ?
 341                         (*(bss_desc->bcn_wpa_ie)).
 342                         vend_hdr.element_id : 0,
 343                         (bss_desc->bcn_rsn_ie) ?
 344                         (*(bss_desc->bcn_rsn_ie)).
 345                         ieee_hdr.element_id : 0,
 346                         priv->sec_info.encryption_mode,
 347                         bss_desc->privacy);
 348                 return true;
 349         }
 350         return false;
 351 }
 352
 353 /*
 354  * This function checks if a scanned network is compatible with the driver
 355  * settings.
 356  *
 357  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 358  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 359  *    0       0       0      0     NONE      0     0   0   yes No security
 360  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 361  *                                                         HT if no AES)
 362  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 363  *                                                         HT if no AES)
 364  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 365  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 366  *                                                         (disable HT)
 367  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 368  *
 369  * Compatibility is not matched while roaming, except for mode.
 370  */
 371 static s32
 372 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 373                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 374 {
 375         struct mwifiex_adapter *adapter = priv->adapter;
 376
 377         bss_desc->disable_11n = false;
 378
 379         /* Don't check for compatibility if roaming */
 380         if (priv->media_connected &&
 381             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 382             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 383                 return 0;
 384
 385         if (priv->wps.session_enable) {
 386                 dev_dbg(adapter->dev,
 387                         "info: return success directly in WPS period\n");
 388                 return 0;
 389         }
 390
 391         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 392                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 393                 return 0;
 394         }
 395
 396         if (bss_desc->bss_mode == mode) {
 397                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 398                         /* No security */
 399                         return 0;
 400                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 401                         /* Static WEP enabled */
 402                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 403                         bss_desc->disable_11n = true;
 404                         return 0;
 405                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 406                         /* WPA enabled */
 407                         if (((priv->adapter->config_bands & BAND_GN ||
 408                               priv->adapter->config_bands & BAND_AN) &&
 409                              bss_desc->bcn_ht_cap) &&
 410                             !mwifiex_is_wpa_oui_present(bss_desc,
 411                                                          CIPHER_SUITE_CCMP)) {
 412
 413                                 if (mwifiex_is_wpa_oui_present
 414                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 415                                         dev_dbg(adapter->dev,
 416                                                 "info: Disable 11n if AES "
 417                                                 "is not supported by AP\n");
 418                                         bss_desc->disable_11n = true;
 419                                 } else {
 420                                         return -1;
 421                                 }
 422                         }
 423                         return 0;
 424                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 425                         /* WPA2 enabled */
 426                         if (((priv->adapter->config_bands & BAND_GN ||
 427                               priv->adapter->config_bands & BAND_AN) &&
 428                              bss_desc->bcn_ht_cap) &&
 429                             !mwifiex_is_rsn_oui_present(bss_desc,
 430                                                         CIPHER_SUITE_CCMP)) {
 431
 432                                 if (mwifiex_is_rsn_oui_present
 433                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 434                                         dev_dbg(adapter->dev,
 435                                                 "info: Disable 11n if AES "
 436                                                 "is not supported by AP\n");
 437                                         bss_desc->disable_11n = true;
 438                                 } else {
 439                                         return -1;
 440                                 }
 441                         }
 442                         return 0;
 443                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 444                         /* Ad-hoc AES enabled */
 445                         return 0;
 446                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 447                         /* Dynamic WEP enabled */
 448                         return 0;
 449                 }
 450
 451                 /* Security doesn't match */
 452                 dev_dbg(adapter->dev,
 453                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 454                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 455                         (bss_desc->bcn_wpa_ie) ?
 456                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 457                         (bss_desc->bcn_rsn_ie) ?
 458                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 459                         (priv->sec_info.wep_enabled) ? "e" : "d",
 460                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 461                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 462                         priv->sec_info.encryption_mode, bss_desc->privacy);
 463                 return -1;
 464         }
 465
 466         /* Mode doesn't match */
 467         return -1;
 468 }
 469
 470 /*
 471  * This function creates a channel list for the driver to scan, based
 472  * on region/band information.
 473  *
 474  * This routine is used for any scan that is not provided with a
 475  * specific channel list to scan.
 476  */
 477 static int
 478 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 479                                  const struct mwifiex_user_scan_cfg
 480                                                         *user_scan_in,
 481                                  struct mwifiex_chan_scan_param_set
 482                                                         *scan_chan_list,
 483                                  u8 filtered_scan)
 484 {
 485         enum ieee80211_band band;
 486         struct ieee80211_supported_band *sband;
 487         struct ieee80211_channel *ch;
 488         struct mwifiex_adapter *adapter = priv->adapter;
 489         int chan_idx = 0, i;
 490
 491         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 492
 493                 if (!priv->wdev->wiphy->bands[band])
 494                         continue;
 495
 496                 sband = priv->wdev->wiphy->bands[band];
 497
 498                 for (i = 0; (i < sband->n_channels) ; i++) {
 499                         ch = &sband->channels[i];
 500                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 501                                 continue;
 502                         scan_chan_list[chan_idx].radio_type = band;
 503
 504                         if (user_scan_in &&
 505                             user_scan_in->chan_list[0].scan_time)
 506                                 scan_chan_list[chan_idx].max_scan_time =
 507                                         cpu_to_le16((u16) user_scan_in->
 508                                         chan_list[0].scan_time);
 509                         else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 510                                 scan_chan_list[chan_idx].max_scan_time =
 511                                         cpu_to_le16(adapter->passive_scan_time);
 512                         else
 513                                 scan_chan_list[chan_idx].max_scan_time =
 514                                         cpu_to_le16(adapter->active_scan_time);
 515
 516                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 517                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 518                                         |= MWIFIEX_PASSIVE_SCAN;
 519                         else
 520                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 521                                         &= ~MWIFIEX_PASSIVE_SCAN;
 522                         scan_chan_list[chan_idx].chan_number =
 523                                                         (u32) ch->hw_value;
 524                         if (filtered_scan) {
 525                                 scan_chan_list[chan_idx].max_scan_time =
 526                                 cpu_to_le16(adapter->specific_scan_time);
 527                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 528                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 529                         }
 530                         chan_idx++;
 531                 }
 532
 533         }
 534         return chan_idx;
 535 }
 536
 537 /*
 538  * This function constructs and sends multiple scan config commands to
 539  * the firmware.
 540  *
 541  * Previous routines in the code flow have created a scan command configuration
 542  * with any requested TLVs.  This function splits the channel TLV into maximum
 543  * channels supported per scan lists and sends the portion of the channel TLV,
 544  * along with the other TLVs, to the firmware.
 545  */
 546 static int
 547 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 548                           u32 max_chan_per_scan, u8 filtered_scan,
 549                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 550                           struct mwifiex_ie_types_chan_list_param_set
 551                           *chan_tlv_out,
 552                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 553 {
 554         int ret = 0;
 555         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 556         struct mwifiex_chan_scan_param_set *start_chan;
 557
 558         u32 tlv_idx;
 559         u32 total_scan_time;
 560
 561         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 562                 dev_dbg(priv->adapter->dev,
 563                         "info: Scan: Null detect: %p, %p, %p\n",
 564                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 565                 return -1;
 566         }
 567
 568         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 569
 570         /* Set the temp channel struct pointer to the start of the desired
 571            list */
 572         tmp_chan_list = scan_chan_list;
 573
 574         /* Loop through the desired channel list, sending a new firmware scan
 575            commands for each max_chan_per_scan channels (or for 1,6,11
 576            individually if configured accordingly) */
 577         while (tmp_chan_list->chan_number) {
 578
 579                 tlv_idx = 0;
 580                 total_scan_time = 0;
 581                 chan_tlv_out->header.len = 0;
 582                 start_chan = tmp_chan_list;
 583
 584                 /*
 585                  * Construct the Channel TLV for the scan command.  Continue to
 586                  * insert channel TLVs until:
 587                  *   - the tlv_idx hits the maximum configured per scan command
 588                  *   - the next channel to insert is 0 (end of desired channel
 589                  *     list)
 590                  *   - done_early is set (controlling individual scanning of
 591                  *     1,6,11)
 592                  */
 593                 if (tlv_idx < max_chan_per_scan) {
 594                         dev_dbg(priv->adapter->dev,
 595                                 "info: Scan: Chan(%3d), Radio(%d),"
 596                                 " Mode(%d, %d), Dur(%d)\n",
 597                                 tmp_chan_list->chan_number,
 598                                 tmp_chan_list->radio_type,
 599                                 tmp_chan_list->chan_scan_mode_bitmap
 600                                 & MWIFIEX_PASSIVE_SCAN,
 601                                 (tmp_chan_list->chan_scan_mode_bitmap
 602                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 603                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 604
 605                         /* Copy the current channel TLV to the command being
 606                            prepared */
 607                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 608                                tmp_chan_list,
 609                                sizeof(chan_tlv_out->chan_scan_param));
 610
 611                         /* Increment the TLV header length by the size
 612                            appended */
 613                         chan_tlv_out->header.len =
 614                         cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
 615                         (sizeof(chan_tlv_out->chan_scan_param)));
 616
 617                         /*
 618                          * The tlv buffer length is set to the number of bytes
 619                          * of the between the channel tlv pointer and the start
 620                          * of the tlv buffer.  This compensates for any TLVs
 621                          * that were appended before the channel list.
 622                          */
 623                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 624                                                         scan_cfg_out->tlv_buf);
 625
 626                         /* Add the size of the channel tlv header and the data
 627                            length */
 628                         scan_cfg_out->tlv_buf_len +=
 629                                 (sizeof(chan_tlv_out->header)
 630                                  + le16_to_cpu(chan_tlv_out->header.len));
 631
 632                         /* Increment the index to the channel tlv we are
 633                            constructing */
 634                         tlv_idx++;
 635
 636                         /* Count the total scan time per command */
 637                         total_scan_time +=
 638                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 639
 640                         /* Increment the tmp pointer to the next channel to
 641                            be scanned */
 642                         tmp_chan_list++;
 643                 }
 644
 645                 /* The total scan time should be less than scan command timeout
 646                    value */
 647                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 648                         dev_err(priv->adapter->dev, "total scan time %dms"
 649                                 " is over limit (%dms), scan skipped\n",
 650                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 651                         ret = -1;
 652                         break;
 653                 }
 654
 655                 priv->adapter->scan_channels = start_chan;
 656
 657                 /* Send the scan command to the firmware with the specified
 658                    cfg */
 659                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 660                                              HostCmd_ACT_GEN_SET, 0,
 661                                              scan_cfg_out);
 662                 if (ret)
 663                         break;
 664         }
 665
 666         if (ret)
 667                 return -1;
 668
 669         return 0;
 670 }
 671
 672 /*
 673  * This function constructs a scan command configuration structure to use
 674  * in scan commands.
 675  *
 676  * Application layer or other functions can invoke network scanning
 677  * with a scan configuration supplied in a user scan configuration structure.
 678  * This structure is used as the basis of one or many scan command configuration
 679  * commands that are sent to the command processing module and eventually to the
 680  * firmware.
 681  *
 682  * This function creates a scan command configuration structure  based on the
 683  * following user supplied parameters (if present):
 684  *      - SSID filter
 685  *      - BSSID filter
 686  *      - Number of Probes to be sent
 687  *      - Channel list
 688  *
 689  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 690  * If the number of probes is not set, adapter default setting is used.
 691  */
 692 static void
 693 mwifiex_config_scan(struct mwifiex_private *priv,
 694                     const struct mwifiex_user_scan_cfg *user_scan_in,
 695                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 696                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 697                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 698                     u8 *max_chan_per_scan, u8 *filtered_scan,
 699                     u8 *scan_current_only)
 700 {
 701         struct mwifiex_adapter *adapter = priv->adapter;
 702         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 703         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 704         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 705         const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
 706         u8 *tlv_pos;
 707         u32 num_probes;
 708         u32 ssid_len;
 709         u32 chan_idx;
 710         u32 chan_num;
 711         u32 scan_type;
 712         u16 scan_dur;
 713         u8 channel;
 714         u8 radio_type;
 715         int i;
 716         u8 ssid_filter;
 717         u8 rates[MWIFIEX_SUPPORTED_RATES];
 718         u32 rates_size;
 719         struct mwifiex_ie_types_htcap *ht_cap;
 720
 721         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 722            in this routine will be preserved since the routine that sends the
 723            command will append channelTLVs at *chan_list_out.  The difference
 724            between the *chan_list_out and the tlv_buf start will be used to
 725            calculate the size of anything we add in this routine. */
 726         scan_cfg_out->tlv_buf_len = 0;
 727
 728         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 729            so later routines know where channels can be added to the command
 730            buf */
 731         tlv_pos = scan_cfg_out->tlv_buf;
 732
 733         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 734            below if a SSID or BSSID filter is sent in the command */
 735         *filtered_scan = false;
 736
 737         /* Initialize the scan as not being only on the current channel.  If
 738            the channel list is customized, only contains one channel, and is
 739            the active channel, this is set true and data flow is not halted. */
 740         *scan_current_only = false;
 741
 742         if (user_scan_in) {
 743
 744                 /* Default the ssid_filter flag to TRUE, set false under
 745                    certain wildcard conditions and qualified by the existence
 746                    of an SSID list before marking the scan as filtered */
 747                 ssid_filter = true;
 748
 749                 /* Set the BSS type scan filter, use Adapter setting if
 750                    unset */
 751                 scan_cfg_out->bss_mode =
 752                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 753                          bss_mode : (u8) adapter->scan_mode);
 754
 755                 /* Set the number of probes to send, use Adapter setting
 756                    if unset */
 757                 num_probes =
 758                         (user_scan_in->num_probes ? user_scan_in->
 759                          num_probes : adapter->scan_probes);
 760
 761                 /*
 762                  * Set the BSSID filter to the incoming configuration,
 763                  * if non-zero.  If not set, it will remain disabled
 764                  * (all zeros).
 765                  */
 766                 memcpy(scan_cfg_out->specific_bssid,
 767                        user_scan_in->specific_bssid,
 768                        sizeof(scan_cfg_out->specific_bssid));
 769
 770                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 771                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 772
 773                         wildcard_ssid_tlv =
 774                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 775                                 tlv_pos;
 776                         wildcard_ssid_tlv->header.type =
 777                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 778                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 779                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 780                                                          max_ssid_length)));
 781
 782                         /*
 783                          * max_ssid_length = 0 tells firmware to perform
 784                          * specific scan for the SSID filled, whereas
 785                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 786                          * wildcard scan.
 787                          */
 788                         if (ssid_len)
 789                                 wildcard_ssid_tlv->max_ssid_length = 0;
 790                         else
 791                                 wildcard_ssid_tlv->max_ssid_length =
 792                                                         IEEE80211_MAX_SSID_LEN;
 793
 794                         memcpy(wildcard_ssid_tlv->ssid,
 795                                user_scan_in->ssid_list[i].ssid, ssid_len);
 796
 797                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 798                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 799
 800                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 801                                 i, wildcard_ssid_tlv->ssid,
 802                                 wildcard_ssid_tlv->max_ssid_length);
 803
 804                         /* Empty wildcard ssid with a maxlen will match many or
 805                            potentially all SSIDs (maxlen == 32), therefore do
 806                            not treat the scan as
 807                            filtered. */
 808                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 809                                 ssid_filter = false;
 810                 }
 811
 812                 /*
 813                  *  The default number of channels sent in the command is low to
 814                  *  ensure the response buffer from the firmware does not
 815                  *  truncate scan results.  That is not an issue with an SSID
 816                  *  or BSSID filter applied to the scan results in the firmware.
 817                  */
 818                 if ((i && ssid_filter) ||
 819                     memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 820                            sizeof(zero_mac)))
 821                         *filtered_scan = true;
 822         } else {
 823                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 824                 num_probes = adapter->scan_probes;
 825         }
 826
 827         /*
 828          *  If a specific BSSID or SSID is used, the number of channels in the
 829          *  scan command will be increased to the absolute maximum.
 830          */
 831         if (*filtered_scan)
 832                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 833         else
 834                 *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
 835
 836         /* If the input config or adapter has the number of Probes set,
 837            add tlv */
 838         if (num_probes) {
 839
 840                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 841                         num_probes);
 842
 843                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 844                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 845                 num_probes_tlv->header.len =
 846                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 847                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 848
 849                 tlv_pos += sizeof(num_probes_tlv->header) +
 850                         le16_to_cpu(num_probes_tlv->header.len);
 851
 852         }
 853
 854         /* Append rates tlv */
 855         memset(rates, 0, sizeof(rates));
 856
 857         rates_size = mwifiex_get_supported_rates(priv, rates);
 858
 859         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 860         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 861         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 862         memcpy(rates_tlv->rates, rates, rates_size);
 863         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 864
 865         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 866
 867         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 868             (priv->adapter->config_bands & BAND_GN ||
 869              priv->adapter->config_bands & BAND_AN)) {
 870                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 871                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 872                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 873                 ht_cap->header.len =
 874                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 875                 radio_type =
 876                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 877                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 878                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 879         }
 880
 881         /* Append vendor specific IE TLV */
 882         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 883
 884         /*
 885          * Set the output for the channel TLV to the address in the tlv buffer
 886          *   past any TLVs that were added in this function (SSID, num_probes).
 887          *   Channel TLVs will be added past this for each scan command,
 888          *   preserving the TLVs that were previously added.
 889          */
 890         *chan_list_out =
 891                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 892
 893         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 894
 895                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 896
 897                 for (chan_idx = 0;
 898                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
 899                      user_scan_in->chan_list[chan_idx].chan_number;
 900                      chan_idx++) {
 901
 902                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 903                         (scan_chan_list + chan_idx)->chan_number = channel;
 904
 905                         radio_type =
 906                                 user_scan_in->chan_list[chan_idx].radio_type;
 907                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 908
 909                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 910
 911                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 912                                 (scan_chan_list +
 913                                  chan_idx)->chan_scan_mode_bitmap
 914                                         |= MWIFIEX_PASSIVE_SCAN;
 915                         else
 916                                 (scan_chan_list +
 917                                  chan_idx)->chan_scan_mode_bitmap
 918                                         &= ~MWIFIEX_PASSIVE_SCAN;
 919
 920                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 921                                 scan_dur = (u16) user_scan_in->
 922                                         chan_list[chan_idx].scan_time;
 923                         } else {
 924                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 925                                         scan_dur = adapter->passive_scan_time;
 926                                 else if (*filtered_scan)
 927                                         scan_dur = adapter->specific_scan_time;
 928                                 else
 929                                         scan_dur = adapter->active_scan_time;
 930                         }
 931
 932                         (scan_chan_list + chan_idx)->min_scan_time =
 933                                 cpu_to_le16(scan_dur);
 934                         (scan_chan_list + chan_idx)->max_scan_time =
 935                                 cpu_to_le16(scan_dur);
 936                 }
 937
 938                 /* Check if we are only scanning the current channel */
 939                 if ((chan_idx == 1) &&
 940                     (user_scan_in->chan_list[0].chan_number ==
 941                      priv->curr_bss_params.bss_descriptor.channel)) {
 942                         *scan_current_only = true;
 943                         dev_dbg(adapter->dev,
 944                                 "info: Scan: Scanning current channel only\n");
 945                 }
 946                 chan_num = chan_idx;
 947         } else {
 948                 dev_dbg(adapter->dev,
 949                         "info: Scan: Creating full region channel list\n");
 950                 chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
 951                                                             scan_chan_list,
 952                                                             *filtered_scan);
 953         }
 954
 955         /*
 956          * In associated state we will reduce the number of channels scanned per
 957          * scan command to avoid any traffic delay/loss. This number is decided
 958          * based on total number of channels to be scanned due to constraints
 959          * of command buffers.
 960          */
 961         if (priv->media_connected) {
 962                 if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
 963                         *max_chan_per_scan = 1;
 964                 else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
 965                         *max_chan_per_scan = 2;
 966                 else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
 967                         *max_chan_per_scan = 3;
 968                 else
 969                         *max_chan_per_scan = 4;
 970         }
 971 }
 972
 973 /*
 974  * This function inspects the scan response buffer for pointers to
 975  * expected TLVs.
 976  *
 977  * TLVs can be included at the end of the scan response BSS information.
 978  *
 979  * Data in the buffer is parsed pointers to TLVs that can potentially
 980  * be passed back in the response.
 981  */
 982 static void
 983 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
 984                                      struct mwifiex_ie_types_data *tlv,
 985                                      u32 tlv_buf_size, u32 req_tlv_type,
 986                                      struct mwifiex_ie_types_data **tlv_data)
 987 {
 988         struct mwifiex_ie_types_data *current_tlv;
 989         u32 tlv_buf_left;
 990         u32 tlv_type;
 991         u32 tlv_len;
 992
 993         current_tlv = tlv;
 994         tlv_buf_left = tlv_buf_size;
 995         *tlv_data = NULL;
 996
 997         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
 998                 tlv_buf_size);
 999
1000         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1001
1002                 tlv_type = le16_to_cpu(current_tlv->header.type);
1003                 tlv_len = le16_to_cpu(current_tlv->header.len);
1004
1005                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1006                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1007                         break;
1008                 }
1009
1010                 if (req_tlv_type == tlv_type) {
1011                         switch (tlv_type) {
1012                         case TLV_TYPE_TSFTIMESTAMP:
1013                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1014                                         "timestamp TLV, len = %d\n", tlv_len);
1015                                 *tlv_data = (struct mwifiex_ie_types_data *)
1016                                         current_tlv;
1017                                 break;
1018                         case TLV_TYPE_CHANNELBANDLIST:
1019                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1020                                         " band list TLV, len = %d\n", tlv_len);
1021                                 *tlv_data = (struct mwifiex_ie_types_data *)
1022                                         current_tlv;
1023                                 break;
1024                         default:
1025                                 dev_err(adapter->dev,
1026                                         "SCAN_RESP: unhandled TLV = %d\n",
1027                                        tlv_type);
1028                                 /* Give up, this seems corrupted */
1029                                 return;
1030                         }
1031                 }
1032
1033                 if (*tlv_data)
1034                         break;
1035
1036
1037                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1038                 current_tlv =
1039                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1040                                                           tlv_len);
1041
1042         }                       /* while */
1043 }
1044
1045 /*
1046  * This function parses provided beacon buffer and updates
1047  * respective fields in bss descriptor structure.
1048  */
1049 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1050                                     struct mwifiex_bssdescriptor *bss_entry)
1051 {
1052         int ret = 0;
1053         u8 element_id;
1054         struct ieee_types_fh_param_set *fh_param_set;
1055         struct ieee_types_ds_param_set *ds_param_set;
1056         struct ieee_types_cf_param_set *cf_param_set;
1057         struct ieee_types_ibss_param_set *ibss_param_set;
1058         u8 *current_ptr;
1059         u8 *rate;
1060         u8 element_len;
1061         u16 total_ie_len;
1062         u8 bytes_to_copy;
1063         u8 rate_size;
1064         u8 found_data_rate_ie;
1065         u32 bytes_left;
1066         struct ieee_types_vendor_specific *vendor_ie;
1067         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1068         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1069
1070         found_data_rate_ie = false;
1071         rate_size = 0;
1072         current_ptr = bss_entry->beacon_buf;
1073         bytes_left = bss_entry->beacon_buf_size;
1074
1075         /* Process variable IE */
1076         while (bytes_left >= 2) {
1077                 element_id = *current_ptr;
1078                 element_len = *(current_ptr + 1);
1079                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1080
1081                 if (bytes_left < total_ie_len) {
1082                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1083                                 " IE, bytes left < IE length\n");
1084                         return -1;
1085                 }
1086                 switch (element_id) {
1087                 case WLAN_EID_SSID:
1088                         bss_entry->ssid.ssid_len = element_len;
1089                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1090                                element_len);
1091                         dev_dbg(adapter->dev,
1092                                 "info: InterpretIE: ssid: %-32s\n",
1093                                 bss_entry->ssid.ssid);
1094                         break;
1095
1096                 case WLAN_EID_SUPP_RATES:
1097                         memcpy(bss_entry->data_rates, current_ptr + 2,
1098                                element_len);
1099                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1100                                element_len);
1101                         rate_size = element_len;
1102                         found_data_rate_ie = true;
1103                         break;
1104
1105                 case WLAN_EID_FH_PARAMS:
1106                         fh_param_set =
1107                                 (struct ieee_types_fh_param_set *) current_ptr;
1108                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1109                                fh_param_set,
1110                                sizeof(struct ieee_types_fh_param_set));
1111                         break;
1112
1113                 case WLAN_EID_DS_PARAMS:
1114                         ds_param_set =
1115                                 (struct ieee_types_ds_param_set *) current_ptr;
1116
1117                         bss_entry->channel = ds_param_set->current_chan;
1118
1119                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1120                                ds_param_set,
1121                                sizeof(struct ieee_types_ds_param_set));
1122                         break;
1123
1124                 case WLAN_EID_CF_PARAMS:
1125                         cf_param_set =
1126                                 (struct ieee_types_cf_param_set *) current_ptr;
1127                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1128                                cf_param_set,
1129                                sizeof(struct ieee_types_cf_param_set));
1130                         break;
1131
1132                 case WLAN_EID_IBSS_PARAMS:
1133                         ibss_param_set =
1134                                 (struct ieee_types_ibss_param_set *)
1135                                 current_ptr;
1136                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1137                                ibss_param_set,
1138                                sizeof(struct ieee_types_ibss_param_set));
1139                         break;
1140
1141                 case WLAN_EID_ERP_INFO:
1142                         bss_entry->erp_flags = *(current_ptr + 2);
1143                         break;
1144
1145                 case WLAN_EID_EXT_SUPP_RATES:
1146                         /*
1147                          * Only process extended supported rate
1148                          * if data rate is already found.
1149                          * Data rate IE should come before
1150                          * extended supported rate IE
1151                          */
1152                         if (found_data_rate_ie) {
1153                                 if ((element_len + rate_size) >
1154                                     MWIFIEX_SUPPORTED_RATES)
1155                                         bytes_to_copy =
1156                                                 (MWIFIEX_SUPPORTED_RATES -
1157                                                  rate_size);
1158                                 else
1159                                         bytes_to_copy = element_len;
1160
1161                                 rate = (u8 *) bss_entry->data_rates;
1162                                 rate += rate_size;
1163                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1164
1165                                 rate = (u8 *) bss_entry->supported_rates;
1166                                 rate += rate_size;
1167                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1168                         }
1169                         break;
1170
1171                 case WLAN_EID_VENDOR_SPECIFIC:
1172                         vendor_ie = (struct ieee_types_vendor_specific *)
1173                                         current_ptr;
1174
1175                         if (!memcmp
1176                             (vendor_ie->vend_hdr.oui, wpa_oui,
1177                              sizeof(wpa_oui))) {
1178                                 bss_entry->bcn_wpa_ie =
1179                                         (struct ieee_types_vendor_specific *)
1180                                         current_ptr;
1181                                 bss_entry->wpa_offset = (u16)
1182                                         (current_ptr - bss_entry->beacon_buf);
1183                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1184                                     sizeof(wmm_oui))) {
1185                                 if (total_ie_len ==
1186                                     sizeof(struct ieee_types_wmm_parameter) ||
1187                                     total_ie_len ==
1188                                     sizeof(struct ieee_types_wmm_info))
1189                                         /*
1190                                          * Only accept and copy the WMM IE if
1191                                          * it matches the size expected for the
1192                                          * WMM Info IE or the WMM Parameter IE.
1193                                          */
1194                                         memcpy((u8 *) &bss_entry->wmm_ie,
1195                                                current_ptr, total_ie_len);
1196                         }
1197                         break;
1198                 case WLAN_EID_RSN:
1199                         bss_entry->bcn_rsn_ie =
1200                                 (struct ieee_types_generic *) current_ptr;
1201                         bss_entry->rsn_offset = (u16) (current_ptr -
1202                                                         bss_entry->beacon_buf);
1203                         break;
1204                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1205                         bss_entry->bcn_wapi_ie =
1206                                 (struct ieee_types_generic *) current_ptr;
1207                         bss_entry->wapi_offset = (u16) (current_ptr -
1208                                                         bss_entry->beacon_buf);
1209                         break;
1210                 case WLAN_EID_HT_CAPABILITY:
1211                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1212                                         (current_ptr +
1213                                         sizeof(struct ieee_types_header));
1214                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1215                                         sizeof(struct ieee_types_header) -
1216                                         bss_entry->beacon_buf);
1217                         break;
1218                 case WLAN_EID_HT_INFORMATION:
1219                         bss_entry->bcn_ht_info = (struct ieee80211_ht_info *)
1220                                         (current_ptr +
1221                                         sizeof(struct ieee_types_header));
1222                         bss_entry->ht_info_offset = (u16) (current_ptr +
1223                                         sizeof(struct ieee_types_header) -
1224                                         bss_entry->beacon_buf);
1225                         break;
1226                 case WLAN_EID_BSS_COEX_2040:
1227                         bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
1228                                         sizeof(struct ieee_types_header));
1229                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1230                                         sizeof(struct ieee_types_header) -
1231                                                 bss_entry->beacon_buf);
1232                         break;
1233                 case WLAN_EID_EXT_CAPABILITY:
1234                         bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
1235                                         sizeof(struct ieee_types_header));
1236                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1237                                         sizeof(struct ieee_types_header) -
1238                                         bss_entry->beacon_buf);
1239                         break;
1240                 default:
1241                         break;
1242                 }
1243
1244                 current_ptr += element_len + 2;
1245
1246                 /* Need to account for IE ID and IE Len */
1247                 bytes_left -= (element_len + 2);
1248
1249         }       /* while (bytes_left > 2) */
1250         return ret;
1251 }
1252
1253 /*
1254  * This function converts radio type scan parameter to a band configuration
1255  * to be used in join command.
1256  */
1257 static u8
1258 mwifiex_radio_type_to_band(u8 radio_type)
1259 {
1260         switch (radio_type) {
1261         case HostCmd_SCAN_RADIO_TYPE_A:
1262                 return BAND_A;
1263         case HostCmd_SCAN_RADIO_TYPE_BG:
1264         default:
1265                 return BAND_G;
1266         }
1267 }
1268
1269 /*
1270  * This is an internal function used to start a scan based on an input
1271  * configuration.
1272  *
1273  * This uses the input user scan configuration information when provided in
1274  * order to send the appropriate scan commands to firmware to populate or
1275  * update the internal driver scan table.
1276  */
1277 int mwifiex_scan_networks(struct mwifiex_private *priv,
1278                           const struct mwifiex_user_scan_cfg *user_scan_in)
1279 {
1280         int ret;
1281         struct mwifiex_adapter *adapter = priv->adapter;
1282         struct cmd_ctrl_node *cmd_node;
1283         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1284         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1285         u32 buf_size;
1286         struct mwifiex_chan_scan_param_set *scan_chan_list;
1287         u8 filtered_scan;
1288         u8 scan_current_chan_only;
1289         u8 max_chan_per_scan;
1290         unsigned long flags;
1291
1292         if (adapter->scan_processing) {
1293                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1294                 return -EBUSY;
1295         }
1296
1297         if (priv->scan_block) {
1298                 dev_err(adapter->dev,
1299                         "cmd: Scan is blocked during association...\n");
1300                 return -EBUSY;
1301         }
1302
1303         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1304         adapter->scan_processing = true;
1305         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1306
1307         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1308                                                                 GFP_KERNEL);
1309         if (!scan_cfg_out) {
1310                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1311                 ret = -ENOMEM;
1312                 goto done;
1313         }
1314
1315         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1316                                                 MWIFIEX_USER_SCAN_CHAN_MAX;
1317         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1318         if (!scan_chan_list) {
1319                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1320                 kfree(scan_cfg_out);
1321                 ret = -ENOMEM;
1322                 goto done;
1323         }
1324
1325         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1326                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1327                             &filtered_scan, &scan_current_chan_only);
1328
1329         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1330                                         &scan_cfg_out->config, chan_list_out,
1331                                         scan_chan_list);
1332
1333         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1334         if (!ret) {
1335                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1336                 if (!list_empty(&adapter->scan_pending_q)) {
1337                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1338                                                     struct cmd_ctrl_node, list);
1339                         list_del(&cmd_node->list);
1340                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1341                                                flags);
1342                         adapter->cmd_queued = cmd_node;
1343                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1344                                                         true);
1345                         queue_work(adapter->workqueue, &adapter->main_work);
1346                 } else {
1347                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1348                                                flags);
1349                 }
1350         }
1351
1352         kfree(scan_cfg_out);
1353         kfree(scan_chan_list);
1354 done:
1355         if (ret) {
1356                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1357                 adapter->scan_processing = false;
1358                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1359         }
1360         return ret;
1361 }
1362
1363 /*
1364  * This function prepares a scan command to be sent to the firmware.
1365  *
1366  * This uses the scan command configuration sent to the command processing
1367  * module in command preparation stage to configure a scan command structure
1368  * to send to firmware.
1369  *
1370  * The fixed fields specifying the BSS type and BSSID filters as well as a
1371  * variable number/length of TLVs are sent in the command to firmware.
1372  *
1373  * Preparation also includes -
1374  *      - Setting command ID, and proper size
1375  *      - Ensuring correct endian-ness
1376  */
1377 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1378                             struct mwifiex_scan_cmd_config *scan_cfg)
1379 {
1380         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1381
1382         /* Set fixed field variables in scan command */
1383         scan_cmd->bss_mode = scan_cfg->bss_mode;
1384         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1385                sizeof(scan_cmd->bssid));
1386         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1387
1388         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1389
1390         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1391         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1392                                           + sizeof(scan_cmd->bssid)
1393                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1394
1395         return 0;
1396 }
1397
1398 /*
1399  * This function checks compatibility of requested network with current
1400  * driver settings.
1401  */
1402 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1403                                         struct mwifiex_bssdescriptor *bss_desc)
1404 {
1405         int ret = -1;
1406
1407         if (!bss_desc)
1408                 return -1;
1409
1410         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1411                              (u16) bss_desc->channel, 0))) {
1412                 switch (priv->bss_mode) {
1413                 case NL80211_IFTYPE_STATION:
1414                 case NL80211_IFTYPE_ADHOC:
1415                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1416                                                             priv->bss_mode);
1417                         if (ret)
1418                                 dev_err(priv->adapter->dev,
1419                                         "Incompatible network settings\n");
1420                                 break;
1421                 default:
1422                                 ret = 0;
1423                 }
1424         }
1425
1426         return ret;
1427 }
1428
1429 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1430                                           struct cfg80211_bss *bss)
1431 {
1432         struct mwifiex_bssdescriptor *bss_desc;
1433         int ret;
1434         unsigned long flags;
1435
1436         /* Allocate and fill new bss descriptor */
1437         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1438                         GFP_KERNEL);
1439         if (!bss_desc) {
1440                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1441                 return -ENOMEM;
1442         }
1443
1444         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1445         if (ret)
1446                 goto done;
1447
1448         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1449         if (ret)
1450                 goto done;
1451
1452         /* Update current bss descriptor parameters */
1453         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1454         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1455         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1456         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1457         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1458         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1459         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1460         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1461         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1462                 0;
1463         priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL;
1464         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1465                 0;
1466         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1467                 NULL;
1468         priv->curr_bss_params.bss_descriptor.
1469                 bss_co_2040_offset = 0;
1470         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1471         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1472         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1473         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1474                 0;
1475
1476         /* Make a copy of current BSSID descriptor */
1477         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1478                sizeof(priv->curr_bss_params.bss_descriptor));
1479         mwifiex_save_curr_bcn(priv);
1480         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1481
1482 done:
1483         kfree(bss_desc);
1484         return 0;
1485 }
1486
1487 /*
1488  * This function handles the command response of scan.
1489  *
1490  * The response buffer for the scan command has the following
1491  * memory layout:
1492  *
1493  *      .-------------------------------------------------------------.
1494  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1495  *      .-------------------------------------------------------------.
1496  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1497  *      .-------------------------------------------------------------.
1498  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1499  *      .-------------------------------------------------------------.
1500  *      |  BSSDescription data (variable, size given in BufSize)      |
1501  *      .-------------------------------------------------------------.
1502  *      |  TLV data (variable, size calculated using Header->Size,    |
1503  *      |            BufSize and sizeof the fixed fields above)       |
1504  *      .-------------------------------------------------------------.
1505  */
1506 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1507                             struct host_cmd_ds_command *resp)
1508 {
1509         int ret = 0;
1510         struct mwifiex_adapter *adapter = priv->adapter;
1511         struct cmd_ctrl_node *cmd_node;
1512         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1513         struct mwifiex_ie_types_data *tlv_data;
1514         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1515         u8 *bss_info;
1516         u32 scan_resp_size;
1517         u32 bytes_left;
1518         u32 idx;
1519         u32 tlv_buf_size;
1520         struct mwifiex_chan_freq_power *cfp;
1521         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1522         struct chan_band_param_set *chan_band;
1523         u8 is_bgscan_resp;
1524         unsigned long flags;
1525         struct cfg80211_bss *bss;
1526
1527         is_bgscan_resp = (le16_to_cpu(resp->command)
1528                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1529         if (is_bgscan_resp)
1530                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1531         else
1532                 scan_rsp = &resp->params.scan_resp;
1533
1534
1535         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1536                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1537                         scan_rsp->number_of_sets);
1538                 ret = -1;
1539                 goto done;
1540         }
1541
1542         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1543         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1544                 bytes_left);
1545
1546         scan_resp_size = le16_to_cpu(resp->size);
1547
1548         dev_dbg(adapter->dev,
1549                 "info: SCAN_RESP: returned %d APs before parsing\n",
1550                 scan_rsp->number_of_sets);
1551
1552         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1553
1554         /*
1555          * The size of the TLV buffer is equal to the entire command response
1556          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1557          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1558          *   response header (S_DS_GEN)
1559          */
1560         tlv_buf_size = scan_resp_size - (bytes_left
1561                                          + sizeof(scan_rsp->bss_descript_size)
1562                                          + sizeof(scan_rsp->number_of_sets)
1563                                          + S_DS_GEN);
1564
1565         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1566                                                  bss_desc_and_tlv_buffer +
1567                                                  bytes_left);
1568
1569         /* Search the TLV buffer space in the scan response for any valid
1570            TLVs */
1571         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1572                                              TLV_TYPE_TSFTIMESTAMP,
1573                                              (struct mwifiex_ie_types_data **)
1574                                              &tsf_tlv);
1575
1576         /* Search the TLV buffer space in the scan response for any valid
1577            TLVs */
1578         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1579                                              TLV_TYPE_CHANNELBANDLIST,
1580                                              (struct mwifiex_ie_types_data **)
1581                                              &chan_band_tlv);
1582
1583         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1584                 u8 bssid[ETH_ALEN];
1585                 s32 rssi;
1586                 const u8 *ie_buf;
1587                 size_t ie_len;
1588                 u16 channel = 0;
1589                 u64 fw_tsf = 0;
1590                 u16 beacon_size = 0;
1591                 u32 curr_bcn_bytes;
1592                 u32 freq;
1593                 u16 beacon_period;
1594                 u16 cap_info_bitmap;
1595                 u8 *current_ptr;
1596                 u64 timestamp;
1597                 struct mwifiex_bcn_param *bcn_param;
1598                 struct mwifiex_bss_priv *bss_priv;
1599
1600                 if (bytes_left >= sizeof(beacon_size)) {
1601                         /* Extract & convert beacon size from command buffer */
1602                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1603                         bytes_left -= sizeof(beacon_size);
1604                         bss_info += sizeof(beacon_size);
1605                 }
1606
1607                 if (!beacon_size || beacon_size > bytes_left) {
1608                         bss_info += bytes_left;
1609                         bytes_left = 0;
1610                         return -1;
1611                 }
1612
1613                 /* Initialize the current working beacon pointer for this BSS
1614                  * iteration */
1615                 current_ptr = bss_info;
1616
1617                 /* Advance the return beacon pointer past the current beacon */
1618                 bss_info += beacon_size;
1619                 bytes_left -= beacon_size;
1620
1621                 curr_bcn_bytes = beacon_size;
1622
1623                 /*
1624                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1625                  *   and capability information
1626                  */
1627                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1628                         dev_err(adapter->dev,
1629                                 "InterpretIE: not enough bytes left\n");
1630                         continue;
1631                 }
1632                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1633                 current_ptr += sizeof(*bcn_param);
1634                 curr_bcn_bytes -= sizeof(*bcn_param);
1635
1636                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1637
1638                 rssi = (s32) bcn_param->rssi;
1639                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1640                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1641
1642                 timestamp = le64_to_cpu(bcn_param->timestamp);
1643                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1644
1645                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1646                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1647                         cap_info_bitmap);
1648
1649                 /* Rest of the current buffer are IE's */
1650                 ie_buf = current_ptr;
1651                 ie_len = curr_bcn_bytes;
1652                 dev_dbg(adapter->dev,
1653                         "info: InterpretIE: IELength for this AP = %d\n",
1654                         curr_bcn_bytes);
1655
1656                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1657                         u8 element_id, element_len;
1658
1659                         element_id = *current_ptr;
1660                         element_len = *(current_ptr + 1);
1661                         if (curr_bcn_bytes < element_len +
1662                                         sizeof(struct ieee_types_header)) {
1663                                 dev_err(priv->adapter->dev,
1664                                         "%s: bytes left < IE length\n",
1665                                         __func__);
1666                                 goto done;
1667                         }
1668                         if (element_id == WLAN_EID_DS_PARAMS) {
1669                                 channel = *(u8 *) (current_ptr +
1670                                         sizeof(struct ieee_types_header));
1671                                 break;
1672                         }
1673
1674                         current_ptr += element_len +
1675                                         sizeof(struct ieee_types_header);
1676                         curr_bcn_bytes -= element_len +
1677                                         sizeof(struct ieee_types_header);
1678                 }
1679
1680                 /*
1681                  * If the TSF TLV was appended to the scan results, save this
1682                  * entry's TSF value in the fw_tsf field. It is the firmware's
1683                  * TSF value at the time the beacon or probe response was
1684                  * received.
1685                  */
1686                 if (tsf_tlv)
1687                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1688                                sizeof(fw_tsf));
1689
1690                 if (channel) {
1691                         struct ieee80211_channel *chan;
1692                         u8 band;
1693
1694                         band = BAND_G;
1695                         if (chan_band_tlv) {
1696                                 chan_band =
1697                                         &chan_band_tlv->chan_band_param[idx];
1698                                 band = mwifiex_radio_type_to_band(
1699                                                 chan_band->radio_type
1700                                                 & (BIT(0) | BIT(1)));
1701                         }
1702
1703                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1704
1705                         freq = cfp ? cfp->freq : 0;
1706
1707                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1708
1709                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1710                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1711                                               chan, bssid, timestamp,
1712                                               cap_info_bitmap, beacon_period,
1713                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1714                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1715                                 bss_priv->band = band;
1716                                 bss_priv->fw_tsf = fw_tsf;
1717                                 if (priv->media_connected &&
1718                                     !memcmp(bssid,
1719                                             priv->curr_bss_params.bss_descriptor
1720                                             .mac_address, ETH_ALEN))
1721                                         mwifiex_update_curr_bss_params(priv,
1722                                                                        bss);
1723                                 cfg80211_put_bss(bss);
1724                         }
1725                 } else {
1726                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1727                 }
1728         }
1729
1730         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1731         if (list_empty(&adapter->scan_pending_q)) {
1732                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1733                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1734                 adapter->scan_processing = false;
1735                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1736
1737                 /* Need to indicate IOCTL complete */
1738                 if (adapter->curr_cmd->wait_q_enabled) {
1739                         adapter->cmd_wait_q.status = 0;
1740                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1741                 }
1742                 if (priv->report_scan_result)
1743                         priv->report_scan_result = false;
1744                 if (priv->scan_pending_on_block) {
1745                         priv->scan_pending_on_block = false;
1746                         up(&priv->async_sem);
1747                 }
1748
1749                 if (priv->user_scan_cfg) {
1750                         if (!priv->scan_request->aborted) {
1751                                 dev_dbg(priv->adapter->dev,
1752                                         "info: notifying scan done\n");
1753                                 cfg80211_scan_done(priv->scan_request, 0);
1754                         } else {
1755                                 dev_dbg(priv->adapter->dev,
1756                                         "info: scan already aborted\n");
1757                         }
1758
1759                         priv->scan_request = NULL;
1760                         kfree(priv->user_scan_cfg);
1761                         priv->user_scan_cfg = NULL;
1762                 }
1763         } else {
1764                 if (priv->scan_request && priv->scan_request->aborted) {
1765                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1766                                                flags);
1767                         adapter->scan_delay_cnt = MWIFIEX_MAX_SCAN_DELAY_CNT;
1768                         mod_timer(&priv->scan_delay_timer, jiffies +
1769                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
1770                         dev_dbg(priv->adapter->dev,
1771                                 "info: %s: triggerring scan abort\n", __func__);
1772                 } else if (!mwifiex_wmm_lists_empty(adapter) &&
1773                            (priv->scan_request && (priv->scan_request->flags &
1774                                             CFG80211_SCAN_FLAG_TX_ABORT))) {
1775                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1776                                                flags);
1777                         adapter->scan_delay_cnt = 1;
1778                         mod_timer(&priv->scan_delay_timer, jiffies +
1779                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
1780                         dev_dbg(priv->adapter->dev,
1781                                 "info: %s: deferring scan\n", __func__);
1782                 } else {
1783                         /* Get scan command from scan_pending_q and put to
1784                            cmd_pending_q */
1785                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1786                                                     struct cmd_ctrl_node, list);
1787                         list_del(&cmd_node->list);
1788                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1789                                                flags);
1790                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1791                                                         true);
1792                 }
1793         }
1794
1795 done:
1796         return ret;
1797 }
1798
1799 /*
1800  * This function prepares command for background scan query.
1801  *
1802  * Preparation includes -
1803  *      - Setting command ID and proper size
1804  *      - Setting background scan flush parameter
1805  *      - Ensuring correct endian-ness
1806  */
1807 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1808 {
1809         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1810                 &cmd->params.bg_scan_query;
1811
1812         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1813         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1814                                 + S_DS_GEN);
1815
1816         bg_query->flush = 1;
1817
1818         return 0;
1819 }
1820
1821 /*
1822  * This function inserts scan command node to the scan pending queue.
1823  */
1824 void
1825 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1826                        struct cmd_ctrl_node *cmd_node)
1827 {
1828         struct mwifiex_adapter *adapter = priv->adapter;
1829         unsigned long flags;
1830
1831         cmd_node->wait_q_enabled = true;
1832         cmd_node->condition = &adapter->scan_wait_q_woken;
1833         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1834         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1835         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1836 }
1837
1838 /*
1839  * This function sends a scan command for all available channels to the
1840  * firmware, filtered on a specific SSID.
1841  */
1842 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1843                                       struct cfg80211_ssid *req_ssid)
1844 {
1845         struct mwifiex_adapter *adapter = priv->adapter;
1846         int ret;
1847         struct mwifiex_user_scan_cfg *scan_cfg;
1848
1849         if (adapter->scan_processing) {
1850                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1851                 return -EBUSY;
1852         }
1853
1854         if (priv->scan_block) {
1855                 dev_err(adapter->dev,
1856                         "cmd: Scan is blocked during association...\n");
1857                 return -EBUSY;
1858         }
1859
1860         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1861         if (!scan_cfg) {
1862                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1863                 return -ENOMEM;
1864         }
1865
1866         scan_cfg->ssid_list = req_ssid;
1867         scan_cfg->num_ssids = 1;
1868
1869         ret = mwifiex_scan_networks(priv, scan_cfg);
1870
1871         kfree(scan_cfg);
1872         return ret;
1873 }
1874
1875 /*
1876  * Sends IOCTL request to start a scan.
1877  *
1878  * This function allocates the IOCTL request buffer, fills it
1879  * with requisite parameters and calls the IOCTL handler.
1880  *
1881  * Scan command can be issued for both normal scan and specific SSID
1882  * scan, depending upon whether an SSID is provided or not.
1883  */
1884 int mwifiex_request_scan(struct mwifiex_private *priv,
1885                          struct cfg80211_ssid *req_ssid)
1886 {
1887         int ret;
1888
1889         if (down_interruptible(&priv->async_sem)) {
1890                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1891                         __func__);
1892                 return -1;
1893         }
1894         priv->scan_pending_on_block = true;
1895
1896         priv->adapter->scan_wait_q_woken = false;
1897
1898         if (req_ssid && req_ssid->ssid_len != 0)
1899                 /* Specific SSID scan */
1900                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1901         else
1902                 /* Normal scan */
1903                 ret = mwifiex_scan_networks(priv, NULL);
1904
1905         if (!ret)
1906                 ret = mwifiex_wait_queue_complete(priv->adapter);
1907
1908         if (ret == -1) {
1909                 priv->scan_pending_on_block = false;
1910                 up(&priv->async_sem);
1911         }
1912
1913         return ret;
1914 }
1915
1916 /*
1917  * This function appends the vendor specific IE TLV to a buffer.
1918  */
1919 int
1920 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1921                             u16 vsie_mask, u8 **buffer)
1922 {
1923         int id, ret_len = 0;
1924         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1925
1926         if (!buffer)
1927                 return 0;
1928         if (!(*buffer))
1929                 return 0;
1930
1931         /*
1932          * Traverse through the saved vendor specific IE array and append
1933          * the selected(scan/assoc/adhoc) IE as TLV to the command
1934          */
1935         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1936                 if (priv->vs_ie[id].mask & vsie_mask) {
1937                         vs_param_set =
1938                                 (struct mwifiex_ie_types_vendor_param_set *)
1939                                 *buffer;
1940                         vs_param_set->header.type =
1941                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1942                         vs_param_set->header.len =
1943                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1944                                 & 0x00FF) + 2);
1945                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1946                                le16_to_cpu(vs_param_set->header.len));
1947                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1948                                    sizeof(struct mwifiex_ie_types_header);
1949                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1950                                    sizeof(struct mwifiex_ie_types_header);
1951                 }
1952         }
1953         return ret_len;
1954 }
1955
1956 /*
1957  * This function saves a beacon buffer of the current BSS descriptor.
1958  *
1959  * The current beacon buffer is saved so that it can be restored in the
1960  * following cases that makes the beacon buffer not to contain the current
1961  * ssid's beacon buffer.
1962  *      - The current ssid was not found somehow in the last scan.
1963  *      - The current ssid was the last entry of the scan table and overloaded.
1964  */
1965 void
1966 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1967 {
1968         struct mwifiex_bssdescriptor *curr_bss =
1969                 &priv->curr_bss_params.bss_descriptor;
1970
1971         if (!curr_bss->beacon_buf_size)
1972                 return;
1973
1974         /* allocate beacon buffer at 1st time; or if it's size has changed */
1975         if (!priv->curr_bcn_buf ||
1976             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1977                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1978
1979                 kfree(priv->curr_bcn_buf);
1980                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1981                                              GFP_ATOMIC);
1982                 if (!priv->curr_bcn_buf) {
1983                         dev_err(priv->adapter->dev,
1984                                 "failed to alloc curr_bcn_buf\n");
1985                         return;
1986                 }
1987         }
1988
1989         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
1990                curr_bss->beacon_buf_size);
1991         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
1992                 priv->curr_bcn_size);
1993
1994         curr_bss->beacon_buf = priv->curr_bcn_buf;
1995
1996         /* adjust the pointers in the current BSS descriptor */
1997         if (curr_bss->bcn_wpa_ie)
1998                 curr_bss->bcn_wpa_ie =
1999                         (struct ieee_types_vendor_specific *)
2000                         (curr_bss->beacon_buf +
2001                          curr_bss->wpa_offset);
2002
2003         if (curr_bss->bcn_rsn_ie)
2004                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2005                         (curr_bss->beacon_buf +
2006                          curr_bss->rsn_offset);
2007
2008         if (curr_bss->bcn_ht_cap)
2009                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2010                         (curr_bss->beacon_buf +
2011                          curr_bss->ht_cap_offset);
2012
2013         if (curr_bss->bcn_ht_info)
2014                 curr_bss->bcn_ht_info = (struct ieee80211_ht_info *)
2015                         (curr_bss->beacon_buf +
2016                          curr_bss->ht_info_offset);
2017
2018         if (curr_bss->bcn_bss_co_2040)
2019                 curr_bss->bcn_bss_co_2040 =
2020                         (u8 *) (curr_bss->beacon_buf +
2021                                         curr_bss->bss_co_2040_offset);
2022
2023         if (curr_bss->bcn_ext_cap)
2024                 curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf +
2025                                 curr_bss->ext_cap_offset);
2026 }
2027
2028 /*
2029  * This function frees the current BSS descriptor beacon buffer.
2030  */
2031 void
2032 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2033 {
2034         kfree(priv->curr_bcn_buf);
2035         priv->curr_bcn_buf = NULL;
2036 }