drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD       4
  32 #define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD    15
  33 #define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD   27
  34 #define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD   35
  35
  36 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  37 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  38                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  39                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  40
  41 /* Memory needed to store supported rate */
  42 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  43                                 + HOSTCMD_SUPPORTED_RATES)
  44
  45 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  46         scan */
  47 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  48         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  49                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  50                         + IEEE80211_MAX_SSID_LEN))
  51
  52 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  53 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  54                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  55                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  56                                 + CHAN_TLV_MAX_SIZE                 \
  57                                 + RATE_TLV_MAX_SIZE                 \
  58                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  59
  60
  61 union mwifiex_scan_cmd_config_tlv {
  62         /* Scan configuration (variable length) */
  63         struct mwifiex_scan_cmd_config config;
  64         /* Max allocated block */
  65         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  66 };
  67
  68 enum cipher_suite {
  69         CIPHER_SUITE_TKIP,
  70         CIPHER_SUITE_CCMP,
  71         CIPHER_SUITE_MAX
  72 };
  73 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  74         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  75         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  76 };
  77 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  78         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  79         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  80 };
  81
  82 /*
  83  * This function parses a given IE for a given OUI.
  84  *
  85  * This is used to parse a WPA/RSN IE to find if it has
  86  * a given oui in PTK.
  87  */
  88 static u8
  89 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  90 {
  91         u8 count;
  92
  93         count = iebody->ptk_cnt[0];
  94
  95         /* There could be multiple OUIs for PTK hence
  96            1) Take the length.
  97            2) Check all the OUIs for AES.
  98            3) If one of them is AES then pass success. */
  99         while (count) {
 100                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
 101                         return MWIFIEX_OUI_PRESENT;
 102
 103                 --count;
 104                 if (count)
 105                         iebody = (struct ie_body *) ((u8 *) iebody +
 106                                                 sizeof(iebody->ptk_body));
 107         }
 108
 109         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 110         return MWIFIEX_OUI_NOT_PRESENT;
 111 }
 112
 113 /*
 114  * This function checks if a given OUI is present in a RSN IE.
 115  *
 116  * The function first checks if a RSN IE is present or not in the
 117  * BSS descriptor. It tries to locate the OUI only if such an IE is
 118  * present.
 119  */
 120 static u8
 121 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 122 {
 123         u8 *oui;
 124         struct ie_body *iebody;
 125         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 126
 127         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 128                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 129                 iebody = (struct ie_body *)
 130                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 131                           RSN_GTK_OUI_OFFSET);
 132                 oui = &mwifiex_rsn_oui[cipher][0];
 133                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 134                 if (ret)
 135                         return ret;
 136         }
 137         return ret;
 138 }
 139
 140 /*
 141  * This function checks if a given OUI is present in a WPA IE.
 142  *
 143  * The function first checks if a WPA IE is present or not in the
 144  * BSS descriptor. It tries to locate the OUI only if such an IE is
 145  * present.
 146  */
 147 static u8
 148 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 149 {
 150         u8 *oui;
 151         struct ie_body *iebody;
 152         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 153
 154         if (((bss_desc->bcn_wpa_ie) &&
 155              ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id ==
 156               WLAN_EID_VENDOR_SPECIFIC))) {
 157                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 158                 oui = &mwifiex_wpa_oui[cipher][0];
 159                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 160                 if (ret)
 161                         return ret;
 162         }
 163         return ret;
 164 }
 165
 166 /*
 167  * This function compares two SSIDs and checks if they match.
 168  */
 169 s32
 170 mwifiex_ssid_cmp(struct cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
 171 {
 172         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 173                 return -1;
 174         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 175 }
 176
 177 /*
 178  * This function checks if wapi is enabled in driver and scanned network is
 179  * compatible with it.
 180  */
 181 static bool
 182 mwifiex_is_bss_wapi(struct mwifiex_private *priv,
 183                     struct mwifiex_bssdescriptor *bss_desc)
 184 {
 185         if (priv->sec_info.wapi_enabled &&
 186             (bss_desc->bcn_wapi_ie &&
 187              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 188                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 /*
 195  * This function checks if driver is configured with no security mode and
 196  * scanned network is compatible with it.
 197  */
 198 static bool
 199 mwifiex_is_bss_no_sec(struct mwifiex_private *priv,
 200                       struct mwifiex_bssdescriptor *bss_desc)
 201 {
 202         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 203             !priv->sec_info.wpa2_enabled && ((!bss_desc->bcn_wpa_ie) ||
 204                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 205                  WLAN_EID_VENDOR_SPECIFIC)) &&
 206             ((!bss_desc->bcn_rsn_ie) ||
 207                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 208                  WLAN_EID_RSN)) &&
 209             !priv->sec_info.encryption_mode && !bss_desc->privacy) {
 210                 return true;
 211         }
 212         return false;
 213 }
 214
 215 /*
 216  * This function checks if static WEP is enabled in driver and scanned network
 217  * is compatible with it.
 218  */
 219 static bool
 220 mwifiex_is_bss_static_wep(struct mwifiex_private *priv,
 221                           struct mwifiex_bssdescriptor *bss_desc)
 222 {
 223         if (priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 224             !priv->sec_info.wpa2_enabled && bss_desc->privacy) {
 225                 return true;
 226         }
 227         return false;
 228 }
 229
 230 /*
 231  * This function checks if wpa is enabled in driver and scanned network is
 232  * compatible with it.
 233  */
 234 static bool
 235 mwifiex_is_bss_wpa(struct mwifiex_private *priv,
 236                    struct mwifiex_bssdescriptor *bss_desc)
 237 {
 238         if (!priv->sec_info.wep_enabled && priv->sec_info.wpa_enabled &&
 239             !priv->sec_info.wpa2_enabled && ((bss_desc->bcn_wpa_ie) &&
 240             ((*(bss_desc->bcn_wpa_ie)).
 241              vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC))
 242            /*
 243             * Privacy bit may NOT be set in some APs like
 244             * LinkSys WRT54G && bss_desc->privacy
 245             */
 246          ) {
 247                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 248                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 249                         "EncMode=%#x privacy=%#x\n", __func__,
 250                         (bss_desc->bcn_wpa_ie) ?
 251                         (*(bss_desc->bcn_wpa_ie)).
 252                         vend_hdr.element_id : 0,
 253                         (bss_desc->bcn_rsn_ie) ?
 254                         (*(bss_desc->bcn_rsn_ie)).
 255                         ieee_hdr.element_id : 0,
 256                         (priv->sec_info.wep_enabled) ? "e" : "d",
 257                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 258                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 259                         priv->sec_info.encryption_mode,
 260                         bss_desc->privacy);
 261                 return true;
 262         }
 263         return false;
 264 }
 265
 266 /*
 267  * This function checks if wpa2 is enabled in driver and scanned network is
 268  * compatible with it.
 269  */
 270 static bool
 271 mwifiex_is_bss_wpa2(struct mwifiex_private *priv,
 272                     struct mwifiex_bssdescriptor *bss_desc)
 273 {
 274         if (!priv->sec_info.wep_enabled &&
 275             !priv->sec_info.wpa_enabled &&
 276             priv->sec_info.wpa2_enabled &&
 277             ((bss_desc->bcn_rsn_ie) &&
 278              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id == WLAN_EID_RSN))) {
 279                 /*
 280                  * Privacy bit may NOT be set in some APs like
 281                  * LinkSys WRT54G && bss_desc->privacy
 282                  */
 283                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 284                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 285                         "EncMode=%#x privacy=%#x\n", __func__,
 286                         (bss_desc->bcn_wpa_ie) ?
 287                         (*(bss_desc->bcn_wpa_ie)).
 288                         vend_hdr.element_id : 0,
 289                         (bss_desc->bcn_rsn_ie) ?
 290                         (*(bss_desc->bcn_rsn_ie)).
 291                         ieee_hdr.element_id : 0,
 292                         (priv->sec_info.wep_enabled) ? "e" : "d",
 293                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 294                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 295                         priv->sec_info.encryption_mode,
 296                         bss_desc->privacy);
 297                 return true;
 298         }
 299         return false;
 300 }
 301
 302 /*
 303  * This function checks if adhoc AES is enabled in driver and scanned network is
 304  * compatible with it.
 305  */
 306 static bool
 307 mwifiex_is_bss_adhoc_aes(struct mwifiex_private *priv,
 308                          struct mwifiex_bssdescriptor *bss_desc)
 309 {
 310         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 311             !priv->sec_info.wpa2_enabled &&
 312             ((!bss_desc->bcn_wpa_ie) ||
 313              ((*(bss_desc->bcn_wpa_ie)).
 314               vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
 315             ((!bss_desc->bcn_rsn_ie) ||
 316              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 317             !priv->sec_info.encryption_mode && bss_desc->privacy) {
 318                 return true;
 319         }
 320         return false;
 321 }
 322
 323 /*
 324  * This function checks if dynamic WEP is enabled in driver and scanned network
 325  * is compatible with it.
 326  */
 327 static bool
 328 mwifiex_is_bss_dynamic_wep(struct mwifiex_private *priv,
 329                            struct mwifiex_bssdescriptor *bss_desc)
 330 {
 331         if (!priv->sec_info.wep_enabled && !priv->sec_info.wpa_enabled &&
 332             !priv->sec_info.wpa2_enabled &&
 333             ((!bss_desc->bcn_wpa_ie) ||
 334              ((*(bss_desc->bcn_wpa_ie)).
 335               vend_hdr.element_id != WLAN_EID_VENDOR_SPECIFIC)) &&
 336             ((!bss_desc->bcn_rsn_ie) ||
 337              ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != WLAN_EID_RSN)) &&
 338             priv->sec_info.encryption_mode && bss_desc->privacy) {
 339                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 340                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 341                         "EncMode=%#x privacy=%#x\n",
 342                         __func__,
 343                         (bss_desc->bcn_wpa_ie) ?
 344                         (*(bss_desc->bcn_wpa_ie)).
 345                         vend_hdr.element_id : 0,
 346                         (bss_desc->bcn_rsn_ie) ?
 347                         (*(bss_desc->bcn_rsn_ie)).
 348                         ieee_hdr.element_id : 0,
 349                         priv->sec_info.encryption_mode,
 350                         bss_desc->privacy);
 351                 return true;
 352         }
 353         return false;
 354 }
 355
 356 /*
 357  * This function checks if a scanned network is compatible with the driver
 358  * settings.
 359  *
 360  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 361  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 362  *    0       0       0      0     NONE      0     0   0   yes No security
 363  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 364  *                                                         HT if no AES)
 365  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 366  *                                                         HT if no AES)
 367  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 368  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 369  *                                                         (disable HT)
 370  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 371  *
 372  * Compatibility is not matched while roaming, except for mode.
 373  */
 374 static s32
 375 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 376                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 377 {
 378         struct mwifiex_adapter *adapter = priv->adapter;
 379
 380         bss_desc->disable_11n = false;
 381
 382         /* Don't check for compatibility if roaming */
 383         if (priv->media_connected &&
 384             (priv->bss_mode == NL80211_IFTYPE_STATION) &&
 385             (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 386                 return 0;
 387
 388         if (priv->wps.session_enable) {
 389                 dev_dbg(adapter->dev,
 390                         "info: return success directly in WPS period\n");
 391                 return 0;
 392         }
 393
 394         if (bss_desc->chan_sw_ie_present) {
 395                 dev_err(adapter->dev,
 396                         "Don't connect to AP with WLAN_EID_CHANNEL_SWITCH\n");
 397                 return -1;
 398         }
 399
 400         if (mwifiex_is_bss_wapi(priv, bss_desc)) {
 401                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 402                 return 0;
 403         }
 404
 405         if (bss_desc->bss_mode == mode) {
 406                 if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
 407                         /* No security */
 408                         return 0;
 409                 } else if (mwifiex_is_bss_static_wep(priv, bss_desc)) {
 410                         /* Static WEP enabled */
 411                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 412                         bss_desc->disable_11n = true;
 413                         return 0;
 414                 } else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
 415                         /* WPA enabled */
 416                         if (((priv->adapter->config_bands & BAND_GN ||
 417                               priv->adapter->config_bands & BAND_AN) &&
 418                              bss_desc->bcn_ht_cap) &&
 419                             !mwifiex_is_wpa_oui_present(bss_desc,
 420                                                          CIPHER_SUITE_CCMP)) {
 421
 422                                 if (mwifiex_is_wpa_oui_present
 423                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 424                                         dev_dbg(adapter->dev,
 425                                                 "info: Disable 11n if AES "
 426                                                 "is not supported by AP\n");
 427                                         bss_desc->disable_11n = true;
 428                                 } else {
 429                                         return -1;
 430                                 }
 431                         }
 432                         return 0;
 433                 } else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
 434                         /* WPA2 enabled */
 435                         if (((priv->adapter->config_bands & BAND_GN ||
 436                               priv->adapter->config_bands & BAND_AN) &&
 437                              bss_desc->bcn_ht_cap) &&
 438                             !mwifiex_is_rsn_oui_present(bss_desc,
 439                                                         CIPHER_SUITE_CCMP)) {
 440
 441                                 if (mwifiex_is_rsn_oui_present
 442                                                 (bss_desc, CIPHER_SUITE_TKIP)) {
 443                                         dev_dbg(adapter->dev,
 444                                                 "info: Disable 11n if AES "
 445                                                 "is not supported by AP\n");
 446                                         bss_desc->disable_11n = true;
 447                                 } else {
 448                                         return -1;
 449                                 }
 450                         }
 451                         return 0;
 452                 } else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
 453                         /* Ad-hoc AES enabled */
 454                         return 0;
 455                 } else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
 456                         /* Dynamic WEP enabled */
 457                         return 0;
 458                 }
 459
 460                 /* Security doesn't match */
 461                 dev_dbg(adapter->dev,
 462                         "info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
 463                         "WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
 464                         (bss_desc->bcn_wpa_ie) ?
 465                         (*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id : 0,
 466                         (bss_desc->bcn_rsn_ie) ?
 467                         (*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id : 0,
 468                         (priv->sec_info.wep_enabled) ? "e" : "d",
 469                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 470                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 471                         priv->sec_info.encryption_mode, bss_desc->privacy);
 472                 return -1;
 473         }
 474
 475         /* Mode doesn't match */
 476         return -1;
 477 }
 478
 479 /*
 480  * This function creates a channel list for the driver to scan, based
 481  * on region/band information.
 482  *
 483  * This routine is used for any scan that is not provided with a
 484  * specific channel list to scan.
 485  */
 486 static int
 487 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 488                                  const struct mwifiex_user_scan_cfg
 489                                                         *user_scan_in,
 490                                  struct mwifiex_chan_scan_param_set
 491                                                         *scan_chan_list,
 492                                  u8 filtered_scan)
 493 {
 494         enum ieee80211_band band;
 495         struct ieee80211_supported_band *sband;
 496         struct ieee80211_channel *ch;
 497         struct mwifiex_adapter *adapter = priv->adapter;
 498         int chan_idx = 0, i;
 499
 500         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 501
 502                 if (!priv->wdev->wiphy->bands[band])
 503                         continue;
 504
 505                 sband = priv->wdev->wiphy->bands[band];
 506
 507                 for (i = 0; (i < sband->n_channels) ; i++) {
 508                         ch = &sband->channels[i];
 509                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 510                                 continue;
 511                         scan_chan_list[chan_idx].radio_type = band;
 512
 513                         if (user_scan_in &&
 514                             user_scan_in->chan_list[0].scan_time)
 515                                 scan_chan_list[chan_idx].max_scan_time =
 516                                         cpu_to_le16((u16) user_scan_in->
 517                                         chan_list[0].scan_time);
 518                         else if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 519                                 scan_chan_list[chan_idx].max_scan_time =
 520                                         cpu_to_le16(adapter->passive_scan_time);
 521                         else
 522                                 scan_chan_list[chan_idx].max_scan_time =
 523                                         cpu_to_le16(adapter->active_scan_time);
 524
 525                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 526                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 527                                         |= MWIFIEX_PASSIVE_SCAN;
 528                         else
 529                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 530                                         &= ~MWIFIEX_PASSIVE_SCAN;
 531                         scan_chan_list[chan_idx].chan_number =
 532                                                         (u32) ch->hw_value;
 533                         if (filtered_scan) {
 534                                 scan_chan_list[chan_idx].max_scan_time =
 535                                 cpu_to_le16(adapter->specific_scan_time);
 536                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 537                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 538                         }
 539                         chan_idx++;
 540                 }
 541
 542         }
 543         return chan_idx;
 544 }
 545
 546 /*
 547  * This function constructs and sends multiple scan config commands to
 548  * the firmware.
 549  *
 550  * Previous routines in the code flow have created a scan command configuration
 551  * with any requested TLVs.  This function splits the channel TLV into maximum
 552  * channels supported per scan lists and sends the portion of the channel TLV,
 553  * along with the other TLVs, to the firmware.
 554  */
 555 static int
 556 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 557                           u32 max_chan_per_scan, u8 filtered_scan,
 558                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 559                           struct mwifiex_ie_types_chan_list_param_set
 560                           *chan_tlv_out,
 561                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 562 {
 563         int ret = 0;
 564         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 565         struct mwifiex_chan_scan_param_set *start_chan;
 566
 567         u32 tlv_idx;
 568         u32 total_scan_time;
 569         u32 done_early;
 570
 571         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 572                 dev_dbg(priv->adapter->dev,
 573                         "info: Scan: Null detect: %p, %p, %p\n",
 574                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 575                 return -1;
 576         }
 577
 578         /* Check csa channel expiry before preparing scan list */
 579         mwifiex_11h_get_csa_closed_channel(priv);
 580
 581         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 582
 583         /* Set the temp channel struct pointer to the start of the desired
 584            list */
 585         tmp_chan_list = scan_chan_list;
 586
 587         /* Loop through the desired channel list, sending a new firmware scan
 588            commands for each max_chan_per_scan channels (or for 1,6,11
 589            individually if configured accordingly) */
 590         while (tmp_chan_list->chan_number) {
 591
 592                 tlv_idx = 0;
 593                 total_scan_time = 0;
 594                 chan_tlv_out->header.len = 0;
 595                 start_chan = tmp_chan_list;
 596                 done_early = false;
 597
 598                 /*
 599                  * Construct the Channel TLV for the scan command.  Continue to
 600                  * insert channel TLVs until:
 601                  *   - the tlv_idx hits the maximum configured per scan command
 602                  *   - the next channel to insert is 0 (end of desired channel
 603                  *     list)
 604                  *   - done_early is set (controlling individual scanning of
 605                  *     1,6,11)
 606                  */
 607                 while (tlv_idx < max_chan_per_scan &&
 608                        tmp_chan_list->chan_number && !done_early) {
 609
 610                         if (tmp_chan_list->chan_number == priv->csa_chan) {
 611                                 tmp_chan_list++;
 612                                 continue;
 613                         }
 614
 615                         dev_dbg(priv->adapter->dev,
 616                                 "info: Scan: Chan(%3d), Radio(%d),"
 617                                 " Mode(%d, %d), Dur(%d)\n",
 618                                 tmp_chan_list->chan_number,
 619                                 tmp_chan_list->radio_type,
 620                                 tmp_chan_list->chan_scan_mode_bitmap
 621                                 & MWIFIEX_PASSIVE_SCAN,
 622                                 (tmp_chan_list->chan_scan_mode_bitmap
 623                                  & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 624                                 le16_to_cpu(tmp_chan_list->max_scan_time));
 625
 626                         /* Copy the current channel TLV to the command being
 627                            prepared */
 628                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 629                                tmp_chan_list,
 630                                sizeof(chan_tlv_out->chan_scan_param));
 631
 632                         /* Increment the TLV header length by the size
 633                            appended */
 634                         le16_add_cpu(&chan_tlv_out->header.len,
 635                                      sizeof(chan_tlv_out->chan_scan_param));
 636
 637                         /*
 638                          * The tlv buffer length is set to the number of bytes
 639                          * of the between the channel tlv pointer and the start
 640                          * of the tlv buffer.  This compensates for any TLVs
 641                          * that were appended before the channel list.
 642                          */
 643                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 644                                                         scan_cfg_out->tlv_buf);
 645
 646                         /* Add the size of the channel tlv header and the data
 647                            length */
 648                         scan_cfg_out->tlv_buf_len +=
 649                                 (sizeof(chan_tlv_out->header)
 650                                  + le16_to_cpu(chan_tlv_out->header.len));
 651
 652                         /* Increment the index to the channel tlv we are
 653                            constructing */
 654                         tlv_idx++;
 655
 656                         /* Count the total scan time per command */
 657                         total_scan_time +=
 658                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 659
 660                         done_early = false;
 661
 662                         /* Stop the loop if the *current* channel is in the
 663                            1,6,11 set and we are not filtering on a BSSID
 664                            or SSID. */
 665                         if (!filtered_scan &&
 666                             (tmp_chan_list->chan_number == 1 ||
 667                              tmp_chan_list->chan_number == 6 ||
 668                              tmp_chan_list->chan_number == 11))
 669                                 done_early = true;
 670
 671                         /* Increment the tmp pointer to the next channel to
 672                            be scanned */
 673                         tmp_chan_list++;
 674
 675                         /* Stop the loop if the *next* channel is in the 1,6,11
 676                            set.  This will cause it to be the only channel
 677                            scanned on the next interation */
 678                         if (!filtered_scan &&
 679                             (tmp_chan_list->chan_number == 1 ||
 680                              tmp_chan_list->chan_number == 6 ||
 681                              tmp_chan_list->chan_number == 11))
 682                                 done_early = true;
 683                 }
 684
 685                 /* The total scan time should be less than scan command timeout
 686                    value */
 687                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 688                         dev_err(priv->adapter->dev, "total scan time %dms"
 689                                 " is over limit (%dms), scan skipped\n",
 690                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 691                         ret = -1;
 692                         break;
 693                 }
 694
 695                 priv->adapter->scan_channels = start_chan;
 696
 697                 /* Send the scan command to the firmware with the specified
 698                    cfg */
 699                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 700                                              HostCmd_ACT_GEN_SET, 0,
 701                                              scan_cfg_out);
 702                 if (ret)
 703                         break;
 704         }
 705
 706         if (ret)
 707                 return -1;
 708
 709         return 0;
 710 }
 711
 712 /*
 713  * This function constructs a scan command configuration structure to use
 714  * in scan commands.
 715  *
 716  * Application layer or other functions can invoke network scanning
 717  * with a scan configuration supplied in a user scan configuration structure.
 718  * This structure is used as the basis of one or many scan command configuration
 719  * commands that are sent to the command processing module and eventually to the
 720  * firmware.
 721  *
 722  * This function creates a scan command configuration structure  based on the
 723  * following user supplied parameters (if present):
 724  *      - SSID filter
 725  *      - BSSID filter
 726  *      - Number of Probes to be sent
 727  *      - Channel list
 728  *
 729  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 730  * If the number of probes is not set, adapter default setting is used.
 731  */
 732 static void
 733 mwifiex_config_scan(struct mwifiex_private *priv,
 734                     const struct mwifiex_user_scan_cfg *user_scan_in,
 735                     struct mwifiex_scan_cmd_config *scan_cfg_out,
 736                     struct mwifiex_ie_types_chan_list_param_set **chan_list_out,
 737                     struct mwifiex_chan_scan_param_set *scan_chan_list,
 738                     u8 *max_chan_per_scan, u8 *filtered_scan,
 739                     u8 *scan_current_only)
 740 {
 741         struct mwifiex_adapter *adapter = priv->adapter;
 742         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 743         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 744         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 745         u8 *tlv_pos;
 746         u32 num_probes;
 747         u32 ssid_len;
 748         u32 chan_idx;
 749         u32 chan_num;
 750         u32 scan_type;
 751         u16 scan_dur;
 752         u8 channel;
 753         u8 radio_type;
 754         int i;
 755         u8 ssid_filter;
 756         u8 rates[MWIFIEX_SUPPORTED_RATES];
 757         u32 rates_size;
 758         struct mwifiex_ie_types_htcap *ht_cap;
 759
 760         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 761            in this routine will be preserved since the routine that sends the
 762            command will append channelTLVs at *chan_list_out.  The difference
 763            between the *chan_list_out and the tlv_buf start will be used to
 764            calculate the size of anything we add in this routine. */
 765         scan_cfg_out->tlv_buf_len = 0;
 766
 767         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 768            so later routines know where channels can be added to the command
 769            buf */
 770         tlv_pos = scan_cfg_out->tlv_buf;
 771
 772         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 773            below if a SSID or BSSID filter is sent in the command */
 774         *filtered_scan = false;
 775
 776         /* Initialize the scan as not being only on the current channel.  If
 777            the channel list is customized, only contains one channel, and is
 778            the active channel, this is set true and data flow is not halted. */
 779         *scan_current_only = false;
 780
 781         if (user_scan_in) {
 782
 783                 /* Default the ssid_filter flag to TRUE, set false under
 784                    certain wildcard conditions and qualified by the existence
 785                    of an SSID list before marking the scan as filtered */
 786                 ssid_filter = true;
 787
 788                 /* Set the BSS type scan filter, use Adapter setting if
 789                    unset */
 790                 scan_cfg_out->bss_mode =
 791                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 792                          bss_mode : (u8) adapter->scan_mode);
 793
 794                 /* Set the number of probes to send, use Adapter setting
 795                    if unset */
 796                 num_probes =
 797                         (user_scan_in->num_probes ? user_scan_in->
 798                          num_probes : adapter->scan_probes);
 799
 800                 /*
 801                  * Set the BSSID filter to the incoming configuration,
 802                  * if non-zero.  If not set, it will remain disabled
 803                  * (all zeros).
 804                  */
 805                 memcpy(scan_cfg_out->specific_bssid,
 806                        user_scan_in->specific_bssid,
 807                        sizeof(scan_cfg_out->specific_bssid));
 808
 809                 for (i = 0; i < user_scan_in->num_ssids; i++) {
 810                         ssid_len = user_scan_in->ssid_list[i].ssid_len;
 811
 812                         wildcard_ssid_tlv =
 813                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 814                                 tlv_pos;
 815                         wildcard_ssid_tlv->header.type =
 816                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 817                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 818                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 819                                                          max_ssid_length)));
 820
 821                         /*
 822                          * max_ssid_length = 0 tells firmware to perform
 823                          * specific scan for the SSID filled, whereas
 824                          * max_ssid_length = IEEE80211_MAX_SSID_LEN is for
 825                          * wildcard scan.
 826                          */
 827                         if (ssid_len)
 828                                 wildcard_ssid_tlv->max_ssid_length = 0;
 829                         else
 830                                 wildcard_ssid_tlv->max_ssid_length =
 831                                                         IEEE80211_MAX_SSID_LEN;
 832
 833                         memcpy(wildcard_ssid_tlv->ssid,
 834                                user_scan_in->ssid_list[i].ssid, ssid_len);
 835
 836                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 837                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 838
 839                         dev_dbg(adapter->dev, "info: scan: ssid[%d]: %s, %d\n",
 840                                 i, wildcard_ssid_tlv->ssid,
 841                                 wildcard_ssid_tlv->max_ssid_length);
 842
 843                         /* Empty wildcard ssid with a maxlen will match many or
 844                            potentially all SSIDs (maxlen == 32), therefore do
 845                            not treat the scan as
 846                            filtered. */
 847                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 848                                 ssid_filter = false;
 849                 }
 850
 851                 /*
 852                  *  The default number of channels sent in the command is low to
 853                  *  ensure the response buffer from the firmware does not
 854                  *  truncate scan results.  That is not an issue with an SSID
 855                  *  or BSSID filter applied to the scan results in the firmware.
 856                  */
 857                 if ((i && ssid_filter) ||
 858                     !is_zero_ether_addr(scan_cfg_out->specific_bssid))
 859                         *filtered_scan = true;
 860         } else {
 861                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 862                 num_probes = adapter->scan_probes;
 863         }
 864
 865         /*
 866          *  If a specific BSSID or SSID is used, the number of channels in the
 867          *  scan command will be increased to the absolute maximum.
 868          */
 869         if (*filtered_scan)
 870                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 871         else
 872                 *max_chan_per_scan = MWIFIEX_DEF_CHANNELS_PER_SCAN_CMD;
 873
 874         /* If the input config or adapter has the number of Probes set,
 875            add tlv */
 876         if (num_probes) {
 877
 878                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 879                         num_probes);
 880
 881                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 882                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 883                 num_probes_tlv->header.len =
 884                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 885                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 886
 887                 tlv_pos += sizeof(num_probes_tlv->header) +
 888                         le16_to_cpu(num_probes_tlv->header.len);
 889
 890         }
 891
 892         /* Append rates tlv */
 893         memset(rates, 0, sizeof(rates));
 894
 895         rates_size = mwifiex_get_supported_rates(priv, rates);
 896
 897         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 898         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 899         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 900         memcpy(rates_tlv->rates, rates, rates_size);
 901         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 902
 903         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 904
 905         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) &&
 906             (priv->adapter->config_bands & BAND_GN ||
 907              priv->adapter->config_bands & BAND_AN)) {
 908                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 909                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 910                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 911                 ht_cap->header.len =
 912                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 913                 radio_type =
 914                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 915                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 916                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 917         }
 918
 919         /* Append vendor specific IE TLV */
 920         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 921
 922         /*
 923          * Set the output for the channel TLV to the address in the tlv buffer
 924          *   past any TLVs that were added in this function (SSID, num_probes).
 925          *   Channel TLVs will be added past this for each scan command,
 926          *   preserving the TLVs that were previously added.
 927          */
 928         *chan_list_out =
 929                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 930
 931         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 932
 933                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 934
 935                 for (chan_idx = 0;
 936                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX &&
 937                      user_scan_in->chan_list[chan_idx].chan_number;
 938                      chan_idx++) {
 939
 940                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 941                         (scan_chan_list + chan_idx)->chan_number = channel;
 942
 943                         radio_type =
 944                                 user_scan_in->chan_list[chan_idx].radio_type;
 945                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 946
 947                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 948
 949                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 950                                 (scan_chan_list +
 951                                  chan_idx)->chan_scan_mode_bitmap
 952                                         |= MWIFIEX_PASSIVE_SCAN;
 953                         else
 954                                 (scan_chan_list +
 955                                  chan_idx)->chan_scan_mode_bitmap
 956                                         &= ~MWIFIEX_PASSIVE_SCAN;
 957
 958                         if (*filtered_scan)
 959                                 (scan_chan_list +
 960                                  chan_idx)->chan_scan_mode_bitmap
 961                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 962
 963                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 964                                 scan_dur = (u16) user_scan_in->
 965                                         chan_list[chan_idx].scan_time;
 966                         } else {
 967                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 968                                         scan_dur = adapter->passive_scan_time;
 969                                 else if (*filtered_scan)
 970                                         scan_dur = adapter->specific_scan_time;
 971                                 else
 972                                         scan_dur = adapter->active_scan_time;
 973                         }
 974
 975                         (scan_chan_list + chan_idx)->min_scan_time =
 976                                 cpu_to_le16(scan_dur);
 977                         (scan_chan_list + chan_idx)->max_scan_time =
 978                                 cpu_to_le16(scan_dur);
 979                 }
 980
 981                 /* Check if we are only scanning the current channel */
 982                 if ((chan_idx == 1) &&
 983                     (user_scan_in->chan_list[0].chan_number ==
 984                      priv->curr_bss_params.bss_descriptor.channel)) {
 985                         *scan_current_only = true;
 986                         dev_dbg(adapter->dev,
 987                                 "info: Scan: Scanning current channel only\n");
 988                 }
 989                 chan_num = chan_idx;
 990         } else {
 991                 dev_dbg(adapter->dev,
 992                         "info: Scan: Creating full region channel list\n");
 993                 chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
 994                                                             scan_chan_list,
 995                                                             *filtered_scan);
 996         }
 997
 998         /*
 999          * In associated state we will reduce the number of channels scanned per
1000          * scan command to avoid any traffic delay/loss. This number is decided
1001          * based on total number of channels to be scanned due to constraints
1002          * of command buffers.
1003          */
1004         if (priv->media_connected) {
1005                 if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
1006                         *max_chan_per_scan = 1;
1007                 else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
1008                         *max_chan_per_scan = 2;
1009                 else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
1010                         *max_chan_per_scan = 3;
1011                 else
1012                         *max_chan_per_scan = 4;
1013         }
1014 }
1015
1016 /*
1017  * This function inspects the scan response buffer for pointers to
1018  * expected TLVs.
1019  *
1020  * TLVs can be included at the end of the scan response BSS information.
1021  *
1022  * Data in the buffer is parsed pointers to TLVs that can potentially
1023  * be passed back in the response.
1024  */
1025 static void
1026 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1027                                      struct mwifiex_ie_types_data *tlv,
1028                                      u32 tlv_buf_size, u32 req_tlv_type,
1029                                      struct mwifiex_ie_types_data **tlv_data)
1030 {
1031         struct mwifiex_ie_types_data *current_tlv;
1032         u32 tlv_buf_left;
1033         u32 tlv_type;
1034         u32 tlv_len;
1035
1036         current_tlv = tlv;
1037         tlv_buf_left = tlv_buf_size;
1038         *tlv_data = NULL;
1039
1040         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1041                 tlv_buf_size);
1042
1043         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1044
1045                 tlv_type = le16_to_cpu(current_tlv->header.type);
1046                 tlv_len = le16_to_cpu(current_tlv->header.len);
1047
1048                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1049                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1050                         break;
1051                 }
1052
1053                 if (req_tlv_type == tlv_type) {
1054                         switch (tlv_type) {
1055                         case TLV_TYPE_TSFTIMESTAMP:
1056                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1057                                         "timestamp TLV, len = %d\n", tlv_len);
1058                                 *tlv_data = current_tlv;
1059                                 break;
1060                         case TLV_TYPE_CHANNELBANDLIST:
1061                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1062                                         " band list TLV, len = %d\n", tlv_len);
1063                                 *tlv_data = current_tlv;
1064                                 break;
1065                         default:
1066                                 dev_err(adapter->dev,
1067                                         "SCAN_RESP: unhandled TLV = %d\n",
1068                                        tlv_type);
1069                                 /* Give up, this seems corrupted */
1070                                 return;
1071                         }
1072                 }
1073
1074                 if (*tlv_data)
1075                         break;
1076
1077
1078                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1079                 current_tlv =
1080                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1081                                                           tlv_len);
1082
1083         }                       /* while */
1084 }
1085
1086 /*
1087  * This function parses provided beacon buffer and updates
1088  * respective fields in bss descriptor structure.
1089  */
1090 int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1091                                     struct mwifiex_bssdescriptor *bss_entry)
1092 {
1093         int ret = 0;
1094         u8 element_id;
1095         struct ieee_types_fh_param_set *fh_param_set;
1096         struct ieee_types_ds_param_set *ds_param_set;
1097         struct ieee_types_cf_param_set *cf_param_set;
1098         struct ieee_types_ibss_param_set *ibss_param_set;
1099         u8 *current_ptr;
1100         u8 *rate;
1101         u8 element_len;
1102         u16 total_ie_len;
1103         u8 bytes_to_copy;
1104         u8 rate_size;
1105         u8 found_data_rate_ie;
1106         u32 bytes_left;
1107         struct ieee_types_vendor_specific *vendor_ie;
1108         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1109         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1110
1111         found_data_rate_ie = false;
1112         rate_size = 0;
1113         current_ptr = bss_entry->beacon_buf;
1114         bytes_left = bss_entry->beacon_buf_size;
1115
1116         /* Process variable IE */
1117         while (bytes_left >= 2) {
1118                 element_id = *current_ptr;
1119                 element_len = *(current_ptr + 1);
1120                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1121
1122                 if (bytes_left < total_ie_len) {
1123                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1124                                 " IE, bytes left < IE length\n");
1125                         return -1;
1126                 }
1127                 switch (element_id) {
1128                 case WLAN_EID_SSID:
1129                         bss_entry->ssid.ssid_len = element_len;
1130                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1131                                element_len);
1132                         dev_dbg(adapter->dev,
1133                                 "info: InterpretIE: ssid: %-32s\n",
1134                                 bss_entry->ssid.ssid);
1135                         break;
1136
1137                 case WLAN_EID_SUPP_RATES:
1138                         memcpy(bss_entry->data_rates, current_ptr + 2,
1139                                element_len);
1140                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1141                                element_len);
1142                         rate_size = element_len;
1143                         found_data_rate_ie = true;
1144                         break;
1145
1146                 case WLAN_EID_FH_PARAMS:
1147                         fh_param_set =
1148                                 (struct ieee_types_fh_param_set *) current_ptr;
1149                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1150                                fh_param_set,
1151                                sizeof(struct ieee_types_fh_param_set));
1152                         break;
1153
1154                 case WLAN_EID_DS_PARAMS:
1155                         ds_param_set =
1156                                 (struct ieee_types_ds_param_set *) current_ptr;
1157
1158                         bss_entry->channel = ds_param_set->current_chan;
1159
1160                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1161                                ds_param_set,
1162                                sizeof(struct ieee_types_ds_param_set));
1163                         break;
1164
1165                 case WLAN_EID_CF_PARAMS:
1166                         cf_param_set =
1167                                 (struct ieee_types_cf_param_set *) current_ptr;
1168                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1169                                cf_param_set,
1170                                sizeof(struct ieee_types_cf_param_set));
1171                         break;
1172
1173                 case WLAN_EID_IBSS_PARAMS:
1174                         ibss_param_set =
1175                                 (struct ieee_types_ibss_param_set *)
1176                                 current_ptr;
1177                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1178                                ibss_param_set,
1179                                sizeof(struct ieee_types_ibss_param_set));
1180                         break;
1181
1182                 case WLAN_EID_ERP_INFO:
1183                         bss_entry->erp_flags = *(current_ptr + 2);
1184                         break;
1185
1186                 case WLAN_EID_PWR_CONSTRAINT:
1187                         bss_entry->local_constraint = *(current_ptr + 2);
1188                         bss_entry->sensed_11h = true;
1189                         break;
1190
1191                 case WLAN_EID_CHANNEL_SWITCH:
1192                         bss_entry->chan_sw_ie_present = true;
1193                 case WLAN_EID_PWR_CAPABILITY:
1194                 case WLAN_EID_TPC_REPORT:
1195                 case WLAN_EID_QUIET:
1196                         bss_entry->sensed_11h = true;
1197                     break;
1198
1199                 case WLAN_EID_EXT_SUPP_RATES:
1200                         /*
1201                          * Only process extended supported rate
1202                          * if data rate is already found.
1203                          * Data rate IE should come before
1204                          * extended supported rate IE
1205                          */
1206                         if (found_data_rate_ie) {
1207                                 if ((element_len + rate_size) >
1208                                     MWIFIEX_SUPPORTED_RATES)
1209                                         bytes_to_copy =
1210                                                 (MWIFIEX_SUPPORTED_RATES -
1211                                                  rate_size);
1212                                 else
1213                                         bytes_to_copy = element_len;
1214
1215                                 rate = (u8 *) bss_entry->data_rates;
1216                                 rate += rate_size;
1217                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1218
1219                                 rate = (u8 *) bss_entry->supported_rates;
1220                                 rate += rate_size;
1221                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1222                         }
1223                         break;
1224
1225                 case WLAN_EID_VENDOR_SPECIFIC:
1226                         vendor_ie = (struct ieee_types_vendor_specific *)
1227                                         current_ptr;
1228
1229                         if (!memcmp
1230                             (vendor_ie->vend_hdr.oui, wpa_oui,
1231                              sizeof(wpa_oui))) {
1232                                 bss_entry->bcn_wpa_ie =
1233                                         (struct ieee_types_vendor_specific *)
1234                                         current_ptr;
1235                                 bss_entry->wpa_offset = (u16)
1236                                         (current_ptr - bss_entry->beacon_buf);
1237                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1238                                     sizeof(wmm_oui))) {
1239                                 if (total_ie_len ==
1240                                     sizeof(struct ieee_types_wmm_parameter) ||
1241                                     total_ie_len ==
1242                                     sizeof(struct ieee_types_wmm_info))
1243                                         /*
1244                                          * Only accept and copy the WMM IE if
1245                                          * it matches the size expected for the
1246                                          * WMM Info IE or the WMM Parameter IE.
1247                                          */
1248                                         memcpy((u8 *) &bss_entry->wmm_ie,
1249                                                current_ptr, total_ie_len);
1250                         }
1251                         break;
1252                 case WLAN_EID_RSN:
1253                         bss_entry->bcn_rsn_ie =
1254                                 (struct ieee_types_generic *) current_ptr;
1255                         bss_entry->rsn_offset = (u16) (current_ptr -
1256                                                         bss_entry->beacon_buf);
1257                         break;
1258                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1259                         bss_entry->bcn_wapi_ie =
1260                                 (struct ieee_types_generic *) current_ptr;
1261                         bss_entry->wapi_offset = (u16) (current_ptr -
1262                                                         bss_entry->beacon_buf);
1263                         break;
1264                 case WLAN_EID_HT_CAPABILITY:
1265                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1266                                         (current_ptr +
1267                                         sizeof(struct ieee_types_header));
1268                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1269                                         sizeof(struct ieee_types_header) -
1270                                         bss_entry->beacon_buf);
1271                         break;
1272                 case WLAN_EID_HT_OPERATION:
1273                         bss_entry->bcn_ht_oper =
1274                                 (struct ieee80211_ht_operation *)(current_ptr +
1275                                         sizeof(struct ieee_types_header));
1276                         bss_entry->ht_info_offset = (u16) (current_ptr +
1277                                         sizeof(struct ieee_types_header) -
1278                                         bss_entry->beacon_buf);
1279                         break;
1280                 case WLAN_EID_VHT_CAPABILITY:
1281                         bss_entry->disable_11ac = false;
1282                         bss_entry->bcn_vht_cap =
1283                                 (void *)(current_ptr +
1284                                          sizeof(struct ieee_types_header));
1285                         bss_entry->vht_cap_offset =
1286                                         (u16)((u8 *)bss_entry->bcn_vht_cap -
1287                                               bss_entry->beacon_buf);
1288                         break;
1289                 case WLAN_EID_VHT_OPERATION:
1290                         bss_entry->bcn_vht_oper =
1291                                 (void *)(current_ptr +
1292                                          sizeof(struct ieee_types_header));
1293                         bss_entry->vht_info_offset =
1294                                         (u16)((u8 *)bss_entry->bcn_vht_oper -
1295                                               bss_entry->beacon_buf);
1296                         break;
1297                 case WLAN_EID_BSS_COEX_2040:
1298                         bss_entry->bcn_bss_co_2040 = current_ptr +
1299                                 sizeof(struct ieee_types_header);
1300                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1301                                         sizeof(struct ieee_types_header) -
1302                                                 bss_entry->beacon_buf);
1303                         break;
1304                 case WLAN_EID_EXT_CAPABILITY:
1305                         bss_entry->bcn_ext_cap = current_ptr +
1306                                 sizeof(struct ieee_types_header);
1307                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1308                                         sizeof(struct ieee_types_header) -
1309                                         bss_entry->beacon_buf);
1310                         break;
1311                 case WLAN_EID_OPMODE_NOTIF:
1312                         bss_entry->oper_mode =
1313                                 (void *)(current_ptr +
1314                                          sizeof(struct ieee_types_header));
1315                         bss_entry->oper_mode_offset =
1316                                         (u16)((u8 *)bss_entry->oper_mode -
1317                                               bss_entry->beacon_buf);
1318                         break;
1319                 default:
1320                         break;
1321                 }
1322
1323                 current_ptr += element_len + 2;
1324
1325                 /* Need to account for IE ID and IE Len */
1326                 bytes_left -= (element_len + 2);
1327
1328         }       /* while (bytes_left > 2) */
1329         return ret;
1330 }
1331
1332 /*
1333  * This function converts radio type scan parameter to a band configuration
1334  * to be used in join command.
1335  */
1336 static u8
1337 mwifiex_radio_type_to_band(u8 radio_type)
1338 {
1339         switch (radio_type) {
1340         case HostCmd_SCAN_RADIO_TYPE_A:
1341                 return BAND_A;
1342         case HostCmd_SCAN_RADIO_TYPE_BG:
1343         default:
1344                 return BAND_G;
1345         }
1346 }
1347
1348 /*
1349  * This is an internal function used to start a scan based on an input
1350  * configuration.
1351  *
1352  * This uses the input user scan configuration information when provided in
1353  * order to send the appropriate scan commands to firmware to populate or
1354  * update the internal driver scan table.
1355  */
1356 int mwifiex_scan_networks(struct mwifiex_private *priv,
1357                           const struct mwifiex_user_scan_cfg *user_scan_in)
1358 {
1359         int ret;
1360         struct mwifiex_adapter *adapter = priv->adapter;
1361         struct cmd_ctrl_node *cmd_node;
1362         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1363         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1364         struct mwifiex_chan_scan_param_set *scan_chan_list;
1365         u8 filtered_scan;
1366         u8 scan_current_chan_only;
1367         u8 max_chan_per_scan;
1368         unsigned long flags;
1369
1370         if (adapter->scan_processing) {
1371                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1372                 return -EBUSY;
1373         }
1374
1375         if (priv->scan_block) {
1376                 dev_err(adapter->dev,
1377                         "cmd: Scan is blocked during association...\n");
1378                 return -EBUSY;
1379         }
1380
1381         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1382         adapter->scan_processing = true;
1383         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1384
1385         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1386                                GFP_KERNEL);
1387         if (!scan_cfg_out) {
1388                 ret = -ENOMEM;
1389                 goto done;
1390         }
1391
1392         scan_chan_list = kcalloc(MWIFIEX_USER_SCAN_CHAN_MAX,
1393                                  sizeof(struct mwifiex_chan_scan_param_set),
1394                                  GFP_KERNEL);
1395         if (!scan_chan_list) {
1396                 kfree(scan_cfg_out);
1397                 ret = -ENOMEM;
1398                 goto done;
1399         }
1400
1401         mwifiex_config_scan(priv, user_scan_in, &scan_cfg_out->config,
1402                             &chan_list_out, scan_chan_list, &max_chan_per_scan,
1403                             &filtered_scan, &scan_current_chan_only);
1404
1405         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1406                                         &scan_cfg_out->config, chan_list_out,
1407                                         scan_chan_list);
1408
1409         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1410         if (!ret) {
1411                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1412                 if (!list_empty(&adapter->scan_pending_q)) {
1413                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1414                                                     struct cmd_ctrl_node, list);
1415                         list_del(&cmd_node->list);
1416                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1417                                                flags);
1418                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1419                                                         true);
1420                         queue_work(adapter->workqueue, &adapter->main_work);
1421
1422                         /* Perform internal scan synchronously */
1423                         if (!priv->scan_request) {
1424                                 dev_dbg(adapter->dev, "wait internal scan\n");
1425                                 mwifiex_wait_queue_complete(adapter, cmd_node);
1426                         }
1427                 } else {
1428                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1429                                                flags);
1430                 }
1431         }
1432
1433         kfree(scan_cfg_out);
1434         kfree(scan_chan_list);
1435 done:
1436         if (ret) {
1437                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1438                 adapter->scan_processing = false;
1439                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1440         }
1441         return ret;
1442 }
1443
1444 /*
1445  * This function prepares a scan command to be sent to the firmware.
1446  *
1447  * This uses the scan command configuration sent to the command processing
1448  * module in command preparation stage to configure a scan command structure
1449  * to send to firmware.
1450  *
1451  * The fixed fields specifying the BSS type and BSSID filters as well as a
1452  * variable number/length of TLVs are sent in the command to firmware.
1453  *
1454  * Preparation also includes -
1455  *      - Setting command ID, and proper size
1456  *      - Ensuring correct endian-ness
1457  */
1458 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1459                             struct mwifiex_scan_cmd_config *scan_cfg)
1460 {
1461         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1462
1463         /* Set fixed field variables in scan command */
1464         scan_cmd->bss_mode = scan_cfg->bss_mode;
1465         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1466                sizeof(scan_cmd->bssid));
1467         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1468
1469         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1470
1471         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1472         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1473                                           + sizeof(scan_cmd->bssid)
1474                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1475
1476         return 0;
1477 }
1478
1479 /*
1480  * This function checks compatibility of requested network with current
1481  * driver settings.
1482  */
1483 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1484                                         struct mwifiex_bssdescriptor *bss_desc)
1485 {
1486         int ret = -1;
1487
1488         if (!bss_desc)
1489                 return -1;
1490
1491         if ((mwifiex_get_cfp(priv, (u8) bss_desc->bss_band,
1492                              (u16) bss_desc->channel, 0))) {
1493                 switch (priv->bss_mode) {
1494                 case NL80211_IFTYPE_STATION:
1495                 case NL80211_IFTYPE_ADHOC:
1496                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1497                                                             priv->bss_mode);
1498                         if (ret)
1499                                 dev_err(priv->adapter->dev,
1500                                         "Incompatible network settings\n");
1501                         break;
1502                 default:
1503                         ret = 0;
1504                 }
1505         }
1506
1507         return ret;
1508 }
1509
1510 static int mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1511                                           struct cfg80211_bss *bss)
1512 {
1513         struct mwifiex_bssdescriptor *bss_desc;
1514         int ret;
1515         unsigned long flags;
1516
1517         /* Allocate and fill new bss descriptor */
1518         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor), GFP_KERNEL);
1519         if (!bss_desc)
1520                 return -ENOMEM;
1521
1522         ret = mwifiex_fill_new_bss_desc(priv, bss, bss_desc);
1523         if (ret)
1524                 goto done;
1525
1526         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1527         if (ret)
1528                 goto done;
1529
1530         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1531         /* Make a copy of current BSSID descriptor */
1532         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1533                sizeof(priv->curr_bss_params.bss_descriptor));
1534
1535         /* The contents of beacon_ie will be copied to its own buffer
1536          * in mwifiex_save_curr_bcn()
1537          */
1538         mwifiex_save_curr_bcn(priv);
1539         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1540
1541 done:
1542         /* beacon_ie buffer was allocated in function
1543          * mwifiex_fill_new_bss_desc(). Free it now.
1544          */
1545         kfree(bss_desc->beacon_buf);
1546         kfree(bss_desc);
1547         return 0;
1548 }
1549
1550 /*
1551  * This function handles the command response of scan.
1552  *
1553  * The response buffer for the scan command has the following
1554  * memory layout:
1555  *
1556  *      .-------------------------------------------------------------.
1557  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1558  *      .-------------------------------------------------------------.
1559  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1560  *      .-------------------------------------------------------------.
1561  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1562  *      .-------------------------------------------------------------.
1563  *      |  BSSDescription data (variable, size given in BufSize)      |
1564  *      .-------------------------------------------------------------.
1565  *      |  TLV data (variable, size calculated using Header->Size,    |
1566  *      |            BufSize and sizeof the fixed fields above)       |
1567  *      .-------------------------------------------------------------.
1568  */
1569 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1570                             struct host_cmd_ds_command *resp)
1571 {
1572         int ret = 0;
1573         struct mwifiex_adapter *adapter = priv->adapter;
1574         struct cmd_ctrl_node *cmd_node;
1575         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1576         struct mwifiex_ie_types_data *tlv_data;
1577         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1578         u8 *bss_info;
1579         u32 scan_resp_size;
1580         u32 bytes_left;
1581         u32 idx;
1582         u32 tlv_buf_size;
1583         struct mwifiex_chan_freq_power *cfp;
1584         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1585         struct chan_band_param_set *chan_band;
1586         u8 is_bgscan_resp;
1587         unsigned long flags;
1588         struct cfg80211_bss *bss;
1589
1590         is_bgscan_resp = (le16_to_cpu(resp->command)
1591                           == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1592         if (is_bgscan_resp)
1593                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1594         else
1595                 scan_rsp = &resp->params.scan_resp;
1596
1597
1598         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1599                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1600                         scan_rsp->number_of_sets);
1601                 ret = -1;
1602                 goto check_next_scan;
1603         }
1604
1605         /* Check csa channel expiry before parsing scan response */
1606         mwifiex_11h_get_csa_closed_channel(priv);
1607
1608         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1609         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1610                 bytes_left);
1611
1612         scan_resp_size = le16_to_cpu(resp->size);
1613
1614         dev_dbg(adapter->dev,
1615                 "info: SCAN_RESP: returned %d APs before parsing\n",
1616                 scan_rsp->number_of_sets);
1617
1618         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1619
1620         /*
1621          * The size of the TLV buffer is equal to the entire command response
1622          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1623          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1624          *   response header (S_DS_GEN)
1625          */
1626         tlv_buf_size = scan_resp_size - (bytes_left
1627                                          + sizeof(scan_rsp->bss_descript_size)
1628                                          + sizeof(scan_rsp->number_of_sets)
1629                                          + S_DS_GEN);
1630
1631         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1632                                                  bss_desc_and_tlv_buffer +
1633                                                  bytes_left);
1634
1635         /* Search the TLV buffer space in the scan response for any valid
1636            TLVs */
1637         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1638                                              TLV_TYPE_TSFTIMESTAMP,
1639                                              (struct mwifiex_ie_types_data **)
1640                                              &tsf_tlv);
1641
1642         /* Search the TLV buffer space in the scan response for any valid
1643            TLVs */
1644         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1645                                              TLV_TYPE_CHANNELBANDLIST,
1646                                              (struct mwifiex_ie_types_data **)
1647                                              &chan_band_tlv);
1648
1649         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1650                 u8 bssid[ETH_ALEN];
1651                 s32 rssi;
1652                 const u8 *ie_buf;
1653                 size_t ie_len;
1654                 u16 channel = 0;
1655                 u64 fw_tsf = 0;
1656                 u16 beacon_size = 0;
1657                 u32 curr_bcn_bytes;
1658                 u32 freq;
1659                 u16 beacon_period;
1660                 u16 cap_info_bitmap;
1661                 u8 *current_ptr;
1662                 u64 timestamp;
1663                 struct mwifiex_bcn_param *bcn_param;
1664                 struct mwifiex_bss_priv *bss_priv;
1665
1666                 if (bytes_left >= sizeof(beacon_size)) {
1667                         /* Extract & convert beacon size from command buffer */
1668                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1669                         bytes_left -= sizeof(beacon_size);
1670                         bss_info += sizeof(beacon_size);
1671                 }
1672
1673                 if (!beacon_size || beacon_size > bytes_left) {
1674                         bss_info += bytes_left;
1675                         bytes_left = 0;
1676                         ret = -1;
1677                         goto check_next_scan;
1678                 }
1679
1680                 /* Initialize the current working beacon pointer for this BSS
1681                  * iteration */
1682                 current_ptr = bss_info;
1683
1684                 /* Advance the return beacon pointer past the current beacon */
1685                 bss_info += beacon_size;
1686                 bytes_left -= beacon_size;
1687
1688                 curr_bcn_bytes = beacon_size;
1689
1690                 /*
1691                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1692                  *   and capability information
1693                  */
1694                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1695                         dev_err(adapter->dev,
1696                                 "InterpretIE: not enough bytes left\n");
1697                         continue;
1698                 }
1699                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1700                 current_ptr += sizeof(*bcn_param);
1701                 curr_bcn_bytes -= sizeof(*bcn_param);
1702
1703                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1704
1705                 rssi = (s32) bcn_param->rssi;
1706                 rssi = (-rssi) * 100;           /* Convert dBm to mBm */
1707                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%d\n", rssi);
1708
1709                 timestamp = le64_to_cpu(bcn_param->timestamp);
1710                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1711
1712                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1713                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1714                         cap_info_bitmap);
1715
1716                 /* Rest of the current buffer are IE's */
1717                 ie_buf = current_ptr;
1718                 ie_len = curr_bcn_bytes;
1719                 dev_dbg(adapter->dev,
1720                         "info: InterpretIE: IELength for this AP = %d\n",
1721                         curr_bcn_bytes);
1722
1723                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1724                         u8 element_id, element_len;
1725
1726                         element_id = *current_ptr;
1727                         element_len = *(current_ptr + 1);
1728                         if (curr_bcn_bytes < element_len +
1729                                         sizeof(struct ieee_types_header)) {
1730                                 dev_err(priv->adapter->dev,
1731                                         "%s: bytes left < IE length\n",
1732                                         __func__);
1733                                 goto check_next_scan;
1734                         }
1735                         if (element_id == WLAN_EID_DS_PARAMS) {
1736                                 channel = *(current_ptr + sizeof(struct ieee_types_header));
1737                                 break;
1738                         }
1739
1740                         current_ptr += element_len +
1741                                         sizeof(struct ieee_types_header);
1742                         curr_bcn_bytes -= element_len +
1743                                         sizeof(struct ieee_types_header);
1744                 }
1745
1746                 /*
1747                  * If the TSF TLV was appended to the scan results, save this
1748                  * entry's TSF value in the fw_tsf field. It is the firmware's
1749                  * TSF value at the time the beacon or probe response was
1750                  * received.
1751                  */
1752                 if (tsf_tlv)
1753                         memcpy(&fw_tsf, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1754                                sizeof(fw_tsf));
1755
1756                 if (channel) {
1757                         struct ieee80211_channel *chan;
1758                         u8 band;
1759
1760                         /* Skip entry if on csa closed channel */
1761                         if (channel == priv->csa_chan) {
1762                                 dev_dbg(adapter->dev,
1763                                         "Dropping entry on csa closed channel\n");
1764                                 continue;
1765                         }
1766
1767                         band = BAND_G;
1768                         if (chan_band_tlv) {
1769                                 chan_band =
1770                                         &chan_band_tlv->chan_band_param[idx];
1771                                 band = mwifiex_radio_type_to_band(
1772                                                 chan_band->radio_type
1773                                                 & (BIT(0) | BIT(1)));
1774                         }
1775
1776                         cfp = mwifiex_get_cfp(priv, band, channel, 0);
1777
1778                         freq = cfp ? cfp->freq : 0;
1779
1780                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1781
1782                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1783                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1784                                               chan, bssid, timestamp,
1785                                               cap_info_bitmap, beacon_period,
1786                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1787                                 bss_priv = (struct mwifiex_bss_priv *)bss->priv;
1788                                 bss_priv->band = band;
1789                                 bss_priv->fw_tsf = fw_tsf;
1790                                 if (priv->media_connected &&
1791                                     !memcmp(bssid,
1792                                             priv->curr_bss_params.bss_descriptor
1793                                             .mac_address, ETH_ALEN))
1794                                         mwifiex_update_curr_bss_params(priv,
1795                                                                        bss);
1796                                 cfg80211_put_bss(priv->wdev->wiphy, bss);
1797                         }
1798                 } else {
1799                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1800                 }
1801         }
1802
1803 check_next_scan:
1804         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1805         if (list_empty(&adapter->scan_pending_q)) {
1806                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1807                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1808                 adapter->scan_processing = false;
1809                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1810
1811                 /* Need to indicate IOCTL complete */
1812                 if (adapter->curr_cmd->wait_q_enabled) {
1813                         adapter->cmd_wait_q.status = 0;
1814                         if (!priv->scan_request) {
1815                                 dev_dbg(adapter->dev,
1816                                         "complete internal scan\n");
1817                                 mwifiex_complete_cmd(adapter,
1818                                                      adapter->curr_cmd);
1819                         }
1820                 }
1821                 if (priv->report_scan_result)
1822                         priv->report_scan_result = false;
1823
1824                 if (priv->scan_request) {
1825                         dev_dbg(adapter->dev, "info: notifying scan done\n");
1826                         cfg80211_scan_done(priv->scan_request, 0);
1827                         priv->scan_request = NULL;
1828                 } else {
1829                         priv->scan_aborting = false;
1830                         dev_dbg(adapter->dev, "info: scan already aborted\n");
1831                 }
1832         } else {
1833                 if ((priv->scan_aborting && !priv->scan_request) ||
1834                     priv->scan_block) {
1835                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1836                                                flags);
1837                         adapter->scan_delay_cnt = MWIFIEX_MAX_SCAN_DELAY_CNT;
1838                         mod_timer(&priv->scan_delay_timer, jiffies);
1839                         dev_dbg(priv->adapter->dev,
1840                                 "info: %s: triggerring scan abort\n", __func__);
1841                 } else if (!mwifiex_wmm_lists_empty(adapter) &&
1842                            (priv->scan_request && (priv->scan_request->flags &
1843                                             NL80211_SCAN_FLAG_LOW_PRIORITY))) {
1844                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1845                                                flags);
1846                         adapter->scan_delay_cnt = 1;
1847                         mod_timer(&priv->scan_delay_timer, jiffies +
1848                                   msecs_to_jiffies(MWIFIEX_SCAN_DELAY_MSEC));
1849                         dev_dbg(priv->adapter->dev,
1850                                 "info: %s: deferring scan\n", __func__);
1851                 } else {
1852                         /* Get scan command from scan_pending_q and put to
1853                            cmd_pending_q */
1854                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1855                                                     struct cmd_ctrl_node, list);
1856                         list_del(&cmd_node->list);
1857                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1858                                                flags);
1859                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1860                                                         true);
1861                 }
1862         }
1863
1864         return ret;
1865 }
1866
1867 /*
1868  * This function prepares command for background scan query.
1869  *
1870  * Preparation includes -
1871  *      - Setting command ID and proper size
1872  *      - Setting background scan flush parameter
1873  *      - Ensuring correct endian-ness
1874  */
1875 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1876 {
1877         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1878                 &cmd->params.bg_scan_query;
1879
1880         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1881         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1882                                 + S_DS_GEN);
1883
1884         bg_query->flush = 1;
1885
1886         return 0;
1887 }
1888
1889 /*
1890  * This function inserts scan command node to the scan pending queue.
1891  */
1892 void
1893 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1894                        struct cmd_ctrl_node *cmd_node)
1895 {
1896         struct mwifiex_adapter *adapter = priv->adapter;
1897         unsigned long flags;
1898
1899         cmd_node->wait_q_enabled = true;
1900         cmd_node->condition = &adapter->scan_wait_q_woken;
1901         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1902         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1903         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1904 }
1905
1906 /*
1907  * This function sends a scan command for all available channels to the
1908  * firmware, filtered on a specific SSID.
1909  */
1910 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1911                                       struct cfg80211_ssid *req_ssid)
1912 {
1913         struct mwifiex_adapter *adapter = priv->adapter;
1914         int ret;
1915         struct mwifiex_user_scan_cfg *scan_cfg;
1916
1917         if (adapter->scan_processing) {
1918                 dev_err(adapter->dev, "cmd: Scan already in process...\n");
1919                 return -EBUSY;
1920         }
1921
1922         if (priv->scan_block) {
1923                 dev_err(adapter->dev,
1924                         "cmd: Scan is blocked during association...\n");
1925                 return -EBUSY;
1926         }
1927
1928         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1929         if (!scan_cfg)
1930                 return -ENOMEM;
1931
1932         scan_cfg->ssid_list = req_ssid;
1933         scan_cfg->num_ssids = 1;
1934
1935         ret = mwifiex_scan_networks(priv, scan_cfg);
1936
1937         kfree(scan_cfg);
1938         return ret;
1939 }
1940
1941 /*
1942  * Sends IOCTL request to start a scan.
1943  *
1944  * This function allocates the IOCTL request buffer, fills it
1945  * with requisite parameters and calls the IOCTL handler.
1946  *
1947  * Scan command can be issued for both normal scan and specific SSID
1948  * scan, depending upon whether an SSID is provided or not.
1949  */
1950 int mwifiex_request_scan(struct mwifiex_private *priv,
1951                          struct cfg80211_ssid *req_ssid)
1952 {
1953         int ret;
1954
1955         if (down_interruptible(&priv->async_sem)) {
1956                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1957                         __func__);
1958                 return -1;
1959         }
1960
1961         priv->adapter->scan_wait_q_woken = false;
1962
1963         if (req_ssid && req_ssid->ssid_len != 0)
1964                 /* Specific SSID scan */
1965                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1966         else
1967                 /* Normal scan */
1968                 ret = mwifiex_scan_networks(priv, NULL);
1969
1970         up(&priv->async_sem);
1971
1972         return ret;
1973 }
1974
1975 /*
1976  * This function appends the vendor specific IE TLV to a buffer.
1977  */
1978 int
1979 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1980                             u16 vsie_mask, u8 **buffer)
1981 {
1982         int id, ret_len = 0;
1983         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1984
1985         if (!buffer)
1986                 return 0;
1987         if (!(*buffer))
1988                 return 0;
1989
1990         /*
1991          * Traverse through the saved vendor specific IE array and append
1992          * the selected(scan/assoc/adhoc) IE as TLV to the command
1993          */
1994         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1995                 if (priv->vs_ie[id].mask & vsie_mask) {
1996                         vs_param_set =
1997                                 (struct mwifiex_ie_types_vendor_param_set *)
1998                                 *buffer;
1999                         vs_param_set->header.type =
2000                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
2001                         vs_param_set->header.len =
2002                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
2003                                 & 0x00FF) + 2);
2004                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
2005                                le16_to_cpu(vs_param_set->header.len));
2006                         *buffer += le16_to_cpu(vs_param_set->header.len) +
2007                                    sizeof(struct mwifiex_ie_types_header);
2008                         ret_len += le16_to_cpu(vs_param_set->header.len) +
2009                                    sizeof(struct mwifiex_ie_types_header);
2010                 }
2011         }
2012         return ret_len;
2013 }
2014
2015 /*
2016  * This function saves a beacon buffer of the current BSS descriptor.
2017  *
2018  * The current beacon buffer is saved so that it can be restored in the
2019  * following cases that makes the beacon buffer not to contain the current
2020  * ssid's beacon buffer.
2021  *      - The current ssid was not found somehow in the last scan.
2022  *      - The current ssid was the last entry of the scan table and overloaded.
2023  */
2024 void
2025 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
2026 {
2027         struct mwifiex_bssdescriptor *curr_bss =
2028                 &priv->curr_bss_params.bss_descriptor;
2029
2030         if (!curr_bss->beacon_buf_size)
2031                 return;
2032
2033         /* allocate beacon buffer at 1st time; or if it's size has changed */
2034         if (!priv->curr_bcn_buf ||
2035             priv->curr_bcn_size != curr_bss->beacon_buf_size) {
2036                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
2037
2038                 kfree(priv->curr_bcn_buf);
2039                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
2040                                              GFP_ATOMIC);
2041                 if (!priv->curr_bcn_buf)
2042                         return;
2043         }
2044
2045         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2046                curr_bss->beacon_buf_size);
2047         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2048                 priv->curr_bcn_size);
2049
2050         curr_bss->beacon_buf = priv->curr_bcn_buf;
2051
2052         /* adjust the pointers in the current BSS descriptor */
2053         if (curr_bss->bcn_wpa_ie)
2054                 curr_bss->bcn_wpa_ie =
2055                         (struct ieee_types_vendor_specific *)
2056                         (curr_bss->beacon_buf +
2057                          curr_bss->wpa_offset);
2058
2059         if (curr_bss->bcn_rsn_ie)
2060                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2061                         (curr_bss->beacon_buf +
2062                          curr_bss->rsn_offset);
2063
2064         if (curr_bss->bcn_ht_cap)
2065                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2066                         (curr_bss->beacon_buf +
2067                          curr_bss->ht_cap_offset);
2068
2069         if (curr_bss->bcn_ht_oper)
2070                 curr_bss->bcn_ht_oper = (struct ieee80211_ht_operation *)
2071                         (curr_bss->beacon_buf +
2072                          curr_bss->ht_info_offset);
2073
2074         if (curr_bss->bcn_vht_cap)
2075                 curr_bss->bcn_ht_cap = (void *)(curr_bss->beacon_buf +
2076                                                 curr_bss->vht_cap_offset);
2077
2078         if (curr_bss->bcn_vht_oper)
2079                 curr_bss->bcn_ht_oper = (void *)(curr_bss->beacon_buf +
2080                                                  curr_bss->vht_info_offset);
2081
2082         if (curr_bss->bcn_bss_co_2040)
2083                 curr_bss->bcn_bss_co_2040 =
2084                         (curr_bss->beacon_buf + curr_bss->bss_co_2040_offset);
2085
2086         if (curr_bss->bcn_ext_cap)
2087                 curr_bss->bcn_ext_cap = curr_bss->beacon_buf +
2088                         curr_bss->ext_cap_offset;
2089
2090         if (curr_bss->oper_mode)
2091                 curr_bss->oper_mode = (void *)(curr_bss->beacon_buf +
2092                                                curr_bss->oper_mode_offset);
2093 }
2094
2095 /*
2096  * This function frees the current BSS descriptor beacon buffer.
2097  */
2098 void
2099 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2100 {
2101         kfree(priv->curr_bcn_buf);
2102         priv->curr_bcn_buf = NULL;
2103 }