drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_CHANNELS_PER_SCAN_CMD            4
  32
  33 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  34 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  35                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  36                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  37
  38 /* Memory needed to store supported rate */
  39 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  40                                 + HOSTCMD_SUPPORTED_RATES)
  41
  42 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  43         scan */
  44 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  45         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  46                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  47                         + IEEE80211_MAX_SSID_LEN))
  48
  49 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  50 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  51                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  52                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  53                                 + CHAN_TLV_MAX_SIZE                 \
  54                                 + RATE_TLV_MAX_SIZE                 \
  55                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  56
  57
  58 union mwifiex_scan_cmd_config_tlv {
  59         /* Scan configuration (variable length) */
  60         struct mwifiex_scan_cmd_config config;
  61         /* Max allocated block */
  62         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  63 };
  64
  65 enum cipher_suite {
  66         CIPHER_SUITE_TKIP,
  67         CIPHER_SUITE_CCMP,
  68         CIPHER_SUITE_MAX
  69 };
  70 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  71         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  72         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  73 };
  74 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  75         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  76         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  77 };
  78
  79 /*
  80  * This function parses a given IE for a given OUI.
  81  *
  82  * This is used to parse a WPA/RSN IE to find if it has
  83  * a given oui in PTK.
  84  */
  85 static u8
  86 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  87 {
  88         u8 count;
  89
  90         count = iebody->ptk_cnt[0];
  91
  92         /* There could be multiple OUIs for PTK hence
  93            1) Take the length.
  94            2) Check all the OUIs for AES.
  95            3) If one of them is AES then pass success. */
  96         while (count) {
  97                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
  98                         return MWIFIEX_OUI_PRESENT;
  99
 100                 --count;
 101                 if (count)
 102                         iebody = (struct ie_body *) ((u8 *) iebody +
 103                                                 sizeof(iebody->ptk_body));
 104         }
 105
 106         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 107         return MWIFIEX_OUI_NOT_PRESENT;
 108 }
 109
 110 /*
 111  * This function checks if a given OUI is present in a RSN IE.
 112  *
 113  * The function first checks if a RSN IE is present or not in the
 114  * BSS descriptor. It tries to locate the OUI only if such an IE is
 115  * present.
 116  */
 117 static u8
 118 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 119 {
 120         u8 *oui;
 121         struct ie_body *iebody;
 122         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 123
 124         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 125                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 126                 iebody = (struct ie_body *)
 127                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 128                          RSN_GTK_OUI_OFFSET);
 129                 oui = &mwifiex_rsn_oui[cipher][0];
 130                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 131                 if (ret)
 132                         return ret;
 133         }
 134         return ret;
 135 }
 136
 137 /*
 138  * This function checks if a given OUI is present in a WPA IE.
 139  *
 140  * The function first checks if a WPA IE is present or not in the
 141  * BSS descriptor. It tries to locate the OUI only if such an IE is
 142  * present.
 143  */
 144 static u8
 145 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 146 {
 147         u8 *oui;
 148         struct ie_body *iebody;
 149         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 150
 151         if (((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)).
 152                                       vend_hdr.element_id == WLAN_EID_WPA))) {
 153                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 154                 oui = &mwifiex_wpa_oui[cipher][0];
 155                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 156                 if (ret)
 157                         return ret;
 158         }
 159         return ret;
 160 }
 161
 162 /*
 163  * This function compares two SSIDs and checks if they match.
 164  */
 165 s32
 166 mwifiex_ssid_cmp(struct mwifiex_802_11_ssid *ssid1,
 167                  struct mwifiex_802_11_ssid *ssid2)
 168 {
 169         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 170                 return -1;
 171         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 172 }
 173
 174 /*
 175  * This function checks if wapi is enabled in driver and scanned network is
 176  * compatible with it.
 177  */
 178 static bool
 179 mwifiex_is_network_compatible_for_wapi(struct mwifiex_private *priv,
 180                                        struct mwifiex_bssdescriptor *bss_desc)
 181 {
 182         if (priv->sec_info.wapi_enabled &&
 183             (bss_desc->bcn_wapi_ie &&
 184              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 185                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 186                 return true;
 187         }
 188         return false;
 189 }
 190
 191 /*
 192  * This function checks if driver is configured with no security mode and
 193  * scanned network is compatible with it.
 194  */
 195 static bool
 196 mwifiex_is_network_compatible_for_no_sec(struct mwifiex_private *priv,
 197                                        struct mwifiex_bssdescriptor *bss_desc)
 198 {
 199         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 200             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 201             && ((!bss_desc->bcn_wpa_ie) ||
 202                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 203             WLAN_EID_WPA))
 204             && ((!bss_desc->bcn_rsn_ie) ||
 205                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 206             WLAN_EID_RSN))
 207             && !priv->sec_info.encryption_mode
 208             && !bss_desc->privacy) {
 209                 return true;
 210         }
 211         return false;
 212 }
 213
 214 /*
 215  * This function checks if static WEP is enabled in driver and scanned network
 216  * is compatible with it.
 217  */
 218 static bool
 219 mwifiex_is_network_compatible_for_static_wep(struct mwifiex_private *priv,
 220                                        struct mwifiex_bssdescriptor *bss_desc)
 221 {
 222         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_ENABLED
 223             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 224             && 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_network_compatible_for_wpa(struct mwifiex_private *priv,
 236                                       struct mwifiex_bssdescriptor *bss_desc)
 237 {
 238         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 239             && priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 240             && ((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)).vend_hdr.
 241                                                 element_id == WLAN_EID_WPA))
 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_status ==
 257                         MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d",
 258                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 259                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 260                         priv->sec_info.encryption_mode,
 261                         bss_desc->privacy);
 262                 return true;
 263         }
 264         return false;
 265 }
 266
 267 /*
 268  * This function checks if wpa2 is enabled in driver and scanned network is
 269  * compatible with it.
 270  */
 271 static bool
 272 mwifiex_is_network_compatible_for_wpa2(struct mwifiex_private *priv,
 273                                        struct mwifiex_bssdescriptor *bss_desc)
 274 {
 275         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 276            && !priv->sec_info.wpa_enabled && priv->sec_info.wpa2_enabled
 277            && ((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 278                                                 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          ) {
 284                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 285                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 286                         "EncMode=%#x privacy=%#x\n", __func__,
 287                         (bss_desc->bcn_wpa_ie) ?
 288                         (*(bss_desc->bcn_wpa_ie)).
 289                         vend_hdr.element_id : 0,
 290                         (bss_desc->bcn_rsn_ie) ?
 291                         (*(bss_desc->bcn_rsn_ie)).
 292                         ieee_hdr.element_id : 0,
 293                         (priv->sec_info.wep_status ==
 294                         MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d",
 295                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 296                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 297                         priv->sec_info.encryption_mode,
 298                         bss_desc->privacy);
 299                 return true;
 300         }
 301         return false;
 302 }
 303
 304 /*
 305  * This function checks if adhoc AES is enabled in driver and scanned network is
 306  * compatible with it.
 307  */
 308 static bool
 309 mwifiex_is_network_compatible_for_adhoc_aes(struct mwifiex_private *priv,
 310                                        struct mwifiex_bssdescriptor *bss_desc)
 311 {
 312         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 313             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 314             && ((!bss_desc->bcn_wpa_ie) || ((*(bss_desc->bcn_wpa_ie)).vend_hdr.
 315                    element_id != WLAN_EID_WPA))
 316             && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 317                    element_id != WLAN_EID_RSN))
 318             && !priv->sec_info.encryption_mode
 319             && bss_desc->privacy) {
 320                 return true;
 321         }
 322         return false;
 323 }
 324
 325 /*
 326  * This function checks if dynamic WEP is enabled in driver and scanned network
 327  * is compatible with it.
 328  */
 329 static bool
 330 mwifiex_is_network_compatible_for_dynamic_wep(struct mwifiex_private *priv,
 331                                        struct mwifiex_bssdescriptor *bss_desc)
 332 {
 333         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 334             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 335             && ((!bss_desc->bcn_wpa_ie) || ((*(bss_desc->bcn_wpa_ie)).vend_hdr.
 336                    element_id != WLAN_EID_WPA))
 337             && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 338                    element_id != WLAN_EID_RSN))
 339             && priv->sec_info.encryption_mode
 340             && bss_desc->privacy) {
 341                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 342                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 343                         "EncMode=%#x privacy=%#x\n",
 344                         __func__,
 345                         (bss_desc->bcn_wpa_ie) ?
 346                         (*(bss_desc->bcn_wpa_ie)).
 347                         vend_hdr.element_id : 0,
 348                         (bss_desc->bcn_rsn_ie) ?
 349                         (*(bss_desc->bcn_rsn_ie)).
 350                         ieee_hdr.element_id : 0,
 351                         priv->sec_info.encryption_mode,
 352                         bss_desc->privacy);
 353                 return true;
 354         }
 355         return false;
 356 }
 357
 358 /*
 359  * This function checks if a scanned network is compatible with the driver
 360  * settings.
 361  *
 362  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 363  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 364  *    0       0       0      0     NONE      0     0   0   yes No security
 365  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 366  *                                                         HT if no AES)
 367  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 368  *                                                         HT if no AES)
 369  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 370  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 371  *                                                         (disable HT)
 372  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 373  *
 374  * Compatibility is not matched while roaming, except for mode.
 375  */
 376 static s32
 377 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 378                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 379 {
 380         struct mwifiex_adapter *adapter = priv->adapter;
 381
 382         bss_desc->disable_11n = false;
 383
 384         /* Don't check for compatibility if roaming */
 385         if (priv->media_connected && (priv->bss_mode == NL80211_IFTYPE_STATION)
 386             && (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 387                 return 0;
 388
 389         if (priv->wps.session_enable) {
 390                 dev_dbg(adapter->dev,
 391                         "info: return success directly in WPS period\n");
 392                 return 0;
 393         }
 394
 395         if (mwifiex_is_network_compatible_for_wapi(priv, bss_desc)) {
 396                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 397                 return 0;
 398         }
 399
 400         if (bss_desc->bss_mode == mode) {
 401                 if (mwifiex_is_network_compatible_for_no_sec(priv, bss_desc)) {
 402                         /* No security */
 403                         return 0;
 404                 } else if (mwifiex_is_network_compatible_for_static_wep(priv,
 405                                                                 bss_desc)) {
 406                         /* Static WEP enabled */
 407                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 408                         bss_desc->disable_11n = true;
 409                         return 0;
 410                 } else if (mwifiex_is_network_compatible_for_wpa(priv,
 411                                                                  bss_desc)) {
 412                         /* WPA enabled */
 413                         if (((priv->adapter->config_bands & BAND_GN
 414                               || priv->adapter->config_bands & BAND_AN)
 415                               && bss_desc->bcn_ht_cap)
 416                               && !mwifiex_is_wpa_oui_present(bss_desc,
 417                                         CIPHER_SUITE_CCMP)) {
 418
 419                                 if (mwifiex_is_wpa_oui_present(bss_desc,
 420                                             CIPHER_SUITE_TKIP)) {
 421                                         dev_dbg(adapter->dev,
 422                                                 "info: Disable 11n if AES "
 423                                                 "is not supported by AP\n");
 424                                         bss_desc->disable_11n = true;
 425                                 } else {
 426                                         return -1;
 427                                 }
 428                         }
 429                         return 0;
 430                 } else if (mwifiex_is_network_compatible_for_wpa2(priv,
 431                                                         bss_desc)) {
 432                         /* WPA2 enabled */
 433                         if (((priv->adapter->config_bands & BAND_GN
 434                               || priv->adapter->config_bands & BAND_AN)
 435                               && bss_desc->bcn_ht_cap)
 436                               && !mwifiex_is_rsn_oui_present(bss_desc,
 437                                         CIPHER_SUITE_CCMP)) {
 438
 439                                 if (mwifiex_is_rsn_oui_present(bss_desc,
 440                                             CIPHER_SUITE_TKIP)) {
 441                                         dev_dbg(adapter->dev,
 442                                                 "info: Disable 11n if AES "
 443                                                 "is not supported by AP\n");
 444                                         bss_desc->disable_11n = true;
 445                                 } else {
 446                                         return -1;
 447                                 }
 448                         }
 449                         return 0;
 450                 } else if (mwifiex_is_network_compatible_for_adhoc_aes(priv,
 451                                                                 bss_desc)) {
 452                         /* Ad-hoc AES enabled */
 453                         return 0;
 454                 } else if (mwifiex_is_network_compatible_for_dynamic_wep(priv,
 455                                                         bss_desc)) {
 456                         /* Dynamic WEP enabled */
 457                         return 0;
 458                 }
 459
 460                 /* Security doesn't match */
 461                 dev_dbg(adapter->dev, "info: %s: failed: "
 462                        "wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s EncMode"
 463                        "=%#x privacy=%#x\n",
 464                        __func__,
 465                        (bss_desc->bcn_wpa_ie) ?
 466                        (*(bss_desc->bcn_wpa_ie)).vend_hdr.
 467                        element_id : 0,
 468                        (bss_desc->bcn_rsn_ie) ?
 469                        (*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 470                        element_id : 0,
 471                        (priv->sec_info.wep_status ==
 472                                 MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d",
 473                        (priv->sec_info.wpa_enabled) ? "e" : "d",
 474                        (priv->sec_info.wpa2_enabled) ? "e" : "d",
 475                        priv->sec_info.encryption_mode, bss_desc->privacy);
 476                 return -1;
 477         }
 478
 479         /* Mode doesn't match */
 480         return -1;
 481 }
 482
 483 /*
 484  * This function creates a channel list for the driver to scan, based
 485  * on region/band information.
 486  *
 487  * This routine is used for any scan that is not provided with a
 488  * specific channel list to scan.
 489  */
 490 static void
 491 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 492                                 const struct mwifiex_user_scan_cfg
 493                                 *user_scan_in,
 494                                 struct mwifiex_chan_scan_param_set
 495                                 *scan_chan_list,
 496                                 u8 filtered_scan)
 497 {
 498         enum ieee80211_band band;
 499         struct ieee80211_supported_band *sband;
 500         struct ieee80211_channel *ch;
 501         struct mwifiex_adapter *adapter = priv->adapter;
 502         int chan_idx = 0, i;
 503         u8 scan_type;
 504
 505         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 506
 507                 if (!priv->wdev->wiphy->bands[band])
 508                         continue;
 509
 510                 sband = priv->wdev->wiphy->bands[band];
 511
 512                 for (i = 0; (i < sband->n_channels) ; i++) {
 513                         ch = &sband->channels[i];
 514                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 515                                 continue;
 516                         scan_chan_list[chan_idx].radio_type = band;
 517                         scan_type = ch->flags & IEEE80211_CHAN_PASSIVE_SCAN;
 518                         if (user_scan_in &&
 519                                 user_scan_in->chan_list[0].scan_time)
 520                                 scan_chan_list[chan_idx].max_scan_time =
 521                                         cpu_to_le16((u16) user_scan_in->
 522                                         chan_list[0].scan_time);
 523                         else if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 524                                 scan_chan_list[chan_idx].max_scan_time =
 525                                         cpu_to_le16(adapter->passive_scan_time);
 526                         else
 527                                 scan_chan_list[chan_idx].max_scan_time =
 528                                         cpu_to_le16(adapter->active_scan_time);
 529                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 530                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 531                                         |= MWIFIEX_PASSIVE_SCAN;
 532                         else
 533                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 534                                         &= ~MWIFIEX_PASSIVE_SCAN;
 535                         scan_chan_list[chan_idx].chan_number =
 536                                                         (u32) ch->hw_value;
 537                         if (filtered_scan) {
 538                                 scan_chan_list[chan_idx].max_scan_time =
 539                                 cpu_to_le16(adapter->specific_scan_time);
 540                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 541                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 542                         }
 543                         chan_idx++;
 544                 }
 545
 546         }
 547 }
 548
 549 /*
 550  * This function constructs and sends multiple scan config commands to
 551  * the firmware.
 552  *
 553  * Previous routines in the code flow have created a scan command configuration
 554  * with any requested TLVs.  This function splits the channel TLV into maximum
 555  * channels supported per scan lists and sends the portion of the channel TLV,
 556  * along with the other TLVs, to the firmware.
 557  */
 558 static int
 559 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 560                           u32 max_chan_per_scan, u8 filtered_scan,
 561                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 562                           struct mwifiex_ie_types_chan_list_param_set
 563                           *chan_tlv_out,
 564                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 565 {
 566         int ret = 0;
 567         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 568         struct mwifiex_chan_scan_param_set *start_chan;
 569
 570         u32 tlv_idx;
 571         u32 total_scan_time;
 572         u32 done_early;
 573
 574         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 575                 dev_dbg(priv->adapter->dev,
 576                         "info: Scan: Null detect: %p, %p, %p\n",
 577                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 578                 return -1;
 579         }
 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                         dev_dbg(priv->adapter->dev,
 611                                 "info: Scan: Chan(%3d), Radio(%d),"
 612                                 " Mode(%d, %d), Dur(%d)\n",
 613                                tmp_chan_list->chan_number,
 614                                tmp_chan_list->radio_type,
 615                                tmp_chan_list->chan_scan_mode_bitmap
 616                                & MWIFIEX_PASSIVE_SCAN,
 617                                (tmp_chan_list->chan_scan_mode_bitmap
 618                                & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 619                                le16_to_cpu(tmp_chan_list->max_scan_time));
 620
 621                         /* Copy the current channel TLV to the command being
 622                            prepared */
 623                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 624                                tmp_chan_list,
 625                                sizeof(chan_tlv_out->chan_scan_param));
 626
 627                         /* Increment the TLV header length by the size
 628                            appended */
 629                         chan_tlv_out->header.len =
 630                         cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
 631                         (sizeof(chan_tlv_out->chan_scan_param)));
 632
 633                         /*
 634                          * The tlv buffer length is set to the number of bytes
 635                          * of the between the channel tlv pointer and the start
 636                          * of the tlv buffer.  This compensates for any TLVs
 637                          * that were appended before the channel list.
 638                          */
 639                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 640                                                         scan_cfg_out->tlv_buf);
 641
 642                         /* Add the size of the channel tlv header and the data
 643                            length */
 644                         scan_cfg_out->tlv_buf_len +=
 645                                 (sizeof(chan_tlv_out->header)
 646                                  + le16_to_cpu(chan_tlv_out->header.len));
 647
 648                         /* Increment the index to the channel tlv we are
 649                            constructing */
 650                         tlv_idx++;
 651
 652                         /* Count the total scan time per command */
 653                         total_scan_time +=
 654                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 655
 656                         done_early = false;
 657
 658                         /* Stop the loop if the *current* channel is in the
 659                            1,6,11 set and we are not filtering on a BSSID
 660                            or SSID. */
 661                         if (!filtered_scan && (tmp_chan_list->chan_number == 1
 662                                 || tmp_chan_list->chan_number == 6
 663                                 || tmp_chan_list->chan_number == 11))
 664                                 done_early = true;
 665
 666                         /* Increment the tmp pointer to the next channel to
 667                            be scanned */
 668                         tmp_chan_list++;
 669
 670                         /* Stop the loop if the *next* channel is in the 1,6,11
 671                            set.  This will cause it to be the only channel
 672                            scanned on the next interation */
 673                         if (!filtered_scan && (tmp_chan_list->chan_number == 1
 674                                 || tmp_chan_list->chan_number == 6
 675                                 || tmp_chan_list->chan_number == 11))
 676                                 done_early = true;
 677                 }
 678
 679                 /* The total scan time should be less than scan command timeout
 680                    value */
 681                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 682                         dev_err(priv->adapter->dev, "total scan time %dms"
 683                                 " is over limit (%dms), scan skipped\n",
 684                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 685                         ret = -1;
 686                         break;
 687                 }
 688
 689                 priv->adapter->scan_channels = start_chan;
 690
 691                 /* Send the scan command to the firmware with the specified
 692                    cfg */
 693                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 694                                              HostCmd_ACT_GEN_SET, 0,
 695                                              scan_cfg_out);
 696                 if (ret)
 697                         break;
 698         }
 699
 700         if (ret)
 701                 return -1;
 702
 703         return 0;
 704 }
 705
 706 /*
 707  * This function constructs a scan command configuration structure to use
 708  * in scan commands.
 709  *
 710  * Application layer or other functions can invoke network scanning
 711  * with a scan configuration supplied in a user scan configuration structure.
 712  * This structure is used as the basis of one or many scan command configuration
 713  * commands that are sent to the command processing module and eventually to the
 714  * firmware.
 715  *
 716  * This function creates a scan command configuration structure  based on the
 717  * following user supplied parameters (if present):
 718  *      - SSID filter
 719  *      - BSSID filter
 720  *      - Number of Probes to be sent
 721  *      - Channel list
 722  *
 723  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 724  * If the number of probes is not set, adapter default setting is used.
 725  */
 726 static void
 727 mwifiex_scan_setup_scan_config(struct mwifiex_private *priv,
 728                                const struct mwifiex_user_scan_cfg *user_scan_in,
 729                                struct mwifiex_scan_cmd_config *scan_cfg_out,
 730                                struct mwifiex_ie_types_chan_list_param_set
 731                                **chan_list_out,
 732                                struct mwifiex_chan_scan_param_set
 733                                *scan_chan_list,
 734                                u8 *max_chan_per_scan, u8 *filtered_scan,
 735                                u8 *scan_current_only)
 736 {
 737         struct mwifiex_adapter *adapter = priv->adapter;
 738         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 739         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 740         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 741         const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
 742         u8 *tlv_pos;
 743         u32 num_probes;
 744         u32 ssid_len;
 745         u32 chan_idx;
 746         u32 scan_type;
 747         u16 scan_dur;
 748         u8 channel;
 749         u8 radio_type;
 750         u32 ssid_idx;
 751         u8 ssid_filter;
 752         u8 rates[MWIFIEX_SUPPORTED_RATES];
 753         u32 rates_size;
 754         struct mwifiex_ie_types_htcap *ht_cap;
 755
 756         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 757            in this routine will be preserved since the routine that sends the
 758            command will append channelTLVs at *chan_list_out.  The difference
 759            between the *chan_list_out and the tlv_buf start will be used to
 760            calculate the size of anything we add in this routine. */
 761         scan_cfg_out->tlv_buf_len = 0;
 762
 763         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 764            so later routines know where channels can be added to the command
 765            buf */
 766         tlv_pos = scan_cfg_out->tlv_buf;
 767
 768         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 769            below if a SSID or BSSID filter is sent in the command */
 770         *filtered_scan = false;
 771
 772         /* Initialize the scan as not being only on the current channel.  If
 773            the channel list is customized, only contains one channel, and is
 774            the active channel, this is set true and data flow is not halted. */
 775         *scan_current_only = false;
 776
 777         if (user_scan_in) {
 778
 779                 /* Default the ssid_filter flag to TRUE, set false under
 780                    certain wildcard conditions and qualified by the existence
 781                    of an SSID list before marking the scan as filtered */
 782                 ssid_filter = true;
 783
 784                 /* Set the BSS type scan filter, use Adapter setting if
 785                    unset */
 786                 scan_cfg_out->bss_mode =
 787                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 788                          bss_mode : (u8) adapter->scan_mode);
 789
 790                 /* Set the number of probes to send, use Adapter setting
 791                    if unset */
 792                 num_probes =
 793                         (user_scan_in->num_probes ? user_scan_in->
 794                          num_probes : adapter->scan_probes);
 795
 796                 /*
 797                  * Set the BSSID filter to the incoming configuration,
 798                  * if non-zero.  If not set, it will remain disabled
 799                  * (all zeros).
 800                  */
 801                 memcpy(scan_cfg_out->specific_bssid,
 802                        user_scan_in->specific_bssid,
 803                        sizeof(scan_cfg_out->specific_bssid));
 804
 805                 for (ssid_idx = 0;
 806                      ((ssid_idx < ARRAY_SIZE(user_scan_in->ssid_list))
 807                       && (*user_scan_in->ssid_list[ssid_idx].ssid
 808                           || user_scan_in->ssid_list[ssid_idx].max_len));
 809                      ssid_idx++) {
 810
 811                         ssid_len = strlen(user_scan_in->ssid_list[ssid_idx].
 812                                           ssid) + 1;
 813
 814                         wildcard_ssid_tlv =
 815                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 816                                 tlv_pos;
 817                         wildcard_ssid_tlv->header.type =
 818                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 819                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 820                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 821                                                          max_ssid_length)));
 822
 823                         /* max_ssid_length = 0 tells firmware to perform
 824                            specific scan for the SSID filled */
 825                         wildcard_ssid_tlv->max_ssid_length = 0;
 826
 827                         memcpy(wildcard_ssid_tlv->ssid,
 828                                user_scan_in->ssid_list[ssid_idx].ssid,
 829                                ssid_len);
 830
 831                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 832                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 833
 834                         dev_dbg(adapter->dev, "info: scan: ssid_list[%d]: %s, %d\n",
 835                                 ssid_idx, wildcard_ssid_tlv->ssid,
 836                                 wildcard_ssid_tlv->max_ssid_length);
 837
 838                         /* Empty wildcard ssid with a maxlen will match many or
 839                            potentially all SSIDs (maxlen == 32), therefore do
 840                            not treat the scan as
 841                            filtered. */
 842                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 843                                 ssid_filter = false;
 844
 845                 }
 846
 847                 /*
 848                  *  The default number of channels sent in the command is low to
 849                  *  ensure the response buffer from the firmware does not
 850                  *  truncate scan results.  That is not an issue with an SSID
 851                  *  or BSSID filter applied to the scan results in the firmware.
 852                  */
 853                 if ((ssid_idx && ssid_filter)
 854                     || memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 855                               sizeof(zero_mac)))
 856                         *filtered_scan = true;
 857         } else {
 858                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 859                 num_probes = adapter->scan_probes;
 860         }
 861
 862         /*
 863          *  If a specific BSSID or SSID is used, the number of channels in the
 864          *  scan command will be increased to the absolute maximum.
 865          */
 866         if (*filtered_scan)
 867                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 868         else
 869                 *max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD;
 870
 871         /* If the input config or adapter has the number of Probes set,
 872            add tlv */
 873         if (num_probes) {
 874
 875                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 876                                                 num_probes);
 877
 878                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 879                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 880                 num_probes_tlv->header.len =
 881                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 882                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 883
 884                 tlv_pos += sizeof(num_probes_tlv->header) +
 885                         le16_to_cpu(num_probes_tlv->header.len);
 886
 887         }
 888
 889         /* Append rates tlv */
 890         memset(rates, 0, sizeof(rates));
 891
 892         rates_size = mwifiex_get_supported_rates(priv, rates);
 893
 894         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 895         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 896         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 897         memcpy(rates_tlv->rates, rates, rates_size);
 898         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 899
 900         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 901
 902         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info)
 903             && (priv->adapter->config_bands & BAND_GN
 904                 || priv->adapter->config_bands & BAND_AN)) {
 905                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 906                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 907                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 908                 ht_cap->header.len =
 909                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 910                 radio_type =
 911                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 912                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 913                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 914         }
 915
 916         /* Append vendor specific IE TLV */
 917         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 918
 919         /*
 920          * Set the output for the channel TLV to the address in the tlv buffer
 921          *   past any TLVs that were added in this function (SSID, num_probes).
 922          *   Channel TLVs will be added past this for each scan command,
 923          *   preserving the TLVs that were previously added.
 924          */
 925         *chan_list_out =
 926                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 927
 928         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 929
 930                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 931
 932                 for (chan_idx = 0;
 933                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX
 934                      && user_scan_in->chan_list[chan_idx].chan_number;
 935                      chan_idx++) {
 936
 937                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 938                         (scan_chan_list + chan_idx)->chan_number = channel;
 939
 940                         radio_type =
 941                                 user_scan_in->chan_list[chan_idx].radio_type;
 942                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 943
 944                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 945
 946                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 947                                 (scan_chan_list +
 948                                  chan_idx)->chan_scan_mode_bitmap
 949                                         |= MWIFIEX_PASSIVE_SCAN;
 950                         else
 951                                 (scan_chan_list +
 952                                  chan_idx)->chan_scan_mode_bitmap
 953                                         &= ~MWIFIEX_PASSIVE_SCAN;
 954
 955                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 956                                 scan_dur = (u16) user_scan_in->
 957                                         chan_list[chan_idx].scan_time;
 958                         } else {
 959                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 960                                         scan_dur = adapter->passive_scan_time;
 961                                 else if (*filtered_scan)
 962                                         scan_dur = adapter->specific_scan_time;
 963                                 else
 964                                         scan_dur = adapter->active_scan_time;
 965                         }
 966
 967                         (scan_chan_list + chan_idx)->min_scan_time =
 968                                 cpu_to_le16(scan_dur);
 969                         (scan_chan_list + chan_idx)->max_scan_time =
 970                                 cpu_to_le16(scan_dur);
 971                 }
 972
 973                 /* Check if we are only scanning the current channel */
 974                 if ((chan_idx == 1)
 975                     && (user_scan_in->chan_list[0].chan_number
 976                         == priv->curr_bss_params.bss_descriptor.channel)) {
 977                         *scan_current_only = true;
 978                         dev_dbg(adapter->dev,
 979                                 "info: Scan: Scanning current channel only\n");
 980                 }
 981
 982         } else {
 983                 dev_dbg(adapter->dev,
 984                                 "info: Scan: Creating full region channel list\n");
 985                 mwifiex_scan_create_channel_list(priv, user_scan_in,
 986                                                  scan_chan_list,
 987                                                  *filtered_scan);
 988         }
 989 }
 990
 991 /*
 992  * This function inspects the scan response buffer for pointers to
 993  * expected TLVs.
 994  *
 995  * TLVs can be included at the end of the scan response BSS information.
 996  *
 997  * Data in the buffer is parsed pointers to TLVs that can potentially
 998  * be passed back in the response.
 999  */
1000 static void
1001 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1002                                      struct mwifiex_ie_types_data *tlv,
1003                                      u32 tlv_buf_size, u32 req_tlv_type,
1004                                      struct mwifiex_ie_types_data **tlv_data)
1005 {
1006         struct mwifiex_ie_types_data *current_tlv;
1007         u32 tlv_buf_left;
1008         u32 tlv_type;
1009         u32 tlv_len;
1010
1011         current_tlv = tlv;
1012         tlv_buf_left = tlv_buf_size;
1013         *tlv_data = NULL;
1014
1015         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1016                                                 tlv_buf_size);
1017
1018         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1019
1020                 tlv_type = le16_to_cpu(current_tlv->header.type);
1021                 tlv_len = le16_to_cpu(current_tlv->header.len);
1022
1023                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1024                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1025                         break;
1026                 }
1027
1028                 if (req_tlv_type == tlv_type) {
1029                         switch (tlv_type) {
1030                         case TLV_TYPE_TSFTIMESTAMP:
1031                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1032                                         "timestamp TLV, len = %d\n", tlv_len);
1033                                 *tlv_data = (struct mwifiex_ie_types_data *)
1034                                         current_tlv;
1035                                 break;
1036                         case TLV_TYPE_CHANNELBANDLIST:
1037                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1038                                         " band list TLV, len = %d\n", tlv_len);
1039                                 *tlv_data = (struct mwifiex_ie_types_data *)
1040                                         current_tlv;
1041                                 break;
1042                         default:
1043                                 dev_err(adapter->dev,
1044                                         "SCAN_RESP: unhandled TLV = %d\n",
1045                                        tlv_type);
1046                                 /* Give up, this seems corrupted */
1047                                 return;
1048                         }
1049                 }
1050
1051                 if (*tlv_data)
1052                         break;
1053
1054
1055                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1056                 current_tlv =
1057                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1058                                                           tlv_len);
1059
1060         }                       /* while */
1061 }
1062
1063 /*
1064  * This function parses provided beacon buffer and updates
1065  * respective fields in bss descriptor structure.
1066  */
1067 int
1068 mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1069                                 struct mwifiex_bssdescriptor *bss_entry,
1070                                 u8 *ie_buf, u32 ie_len)
1071 {
1072         int ret = 0;
1073         u8 element_id;
1074         struct ieee_types_fh_param_set *fh_param_set;
1075         struct ieee_types_ds_param_set *ds_param_set;
1076         struct ieee_types_cf_param_set *cf_param_set;
1077         struct ieee_types_ibss_param_set *ibss_param_set;
1078         u8 *current_ptr;
1079         u8 *rate;
1080         u8 element_len;
1081         u16 total_ie_len;
1082         u8 bytes_to_copy;
1083         u8 rate_size;
1084         u8 found_data_rate_ie;
1085         u32 bytes_left;
1086         struct ieee_types_vendor_specific *vendor_ie;
1087         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1088         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1089
1090         found_data_rate_ie = false;
1091         rate_size = 0;
1092         current_ptr = ie_buf;
1093         bytes_left = ie_len;
1094         bss_entry->beacon_buf = ie_buf;
1095         bss_entry->beacon_buf_size = ie_len;
1096
1097         /* Process variable IE */
1098         while (bytes_left >= 2) {
1099                 element_id = *current_ptr;
1100                 element_len = *(current_ptr + 1);
1101                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1102
1103                 if (bytes_left < total_ie_len) {
1104                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1105                                 " IE, bytes left < IE length\n");
1106                         return -1;
1107                 }
1108                 switch (element_id) {
1109                 case WLAN_EID_SSID:
1110                         bss_entry->ssid.ssid_len = element_len;
1111                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1112                                element_len);
1113                         dev_dbg(adapter->dev, "info: InterpretIE: ssid: "
1114                                               "%-32s\n", bss_entry->ssid.ssid);
1115                         break;
1116
1117                 case WLAN_EID_SUPP_RATES:
1118                         memcpy(bss_entry->data_rates, current_ptr + 2,
1119                                element_len);
1120                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1121                                element_len);
1122                         rate_size = element_len;
1123                         found_data_rate_ie = true;
1124                         break;
1125
1126                 case WLAN_EID_FH_PARAMS:
1127                         fh_param_set =
1128                                 (struct ieee_types_fh_param_set *) current_ptr;
1129                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1130                                fh_param_set,
1131                                sizeof(struct ieee_types_fh_param_set));
1132                         break;
1133
1134                 case WLAN_EID_DS_PARAMS:
1135                         ds_param_set =
1136                                 (struct ieee_types_ds_param_set *) current_ptr;
1137
1138                         bss_entry->channel = ds_param_set->current_chan;
1139
1140                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1141                                ds_param_set,
1142                                sizeof(struct ieee_types_ds_param_set));
1143                         break;
1144
1145                 case WLAN_EID_CF_PARAMS:
1146                         cf_param_set =
1147                                 (struct ieee_types_cf_param_set *) current_ptr;
1148                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1149                                cf_param_set,
1150                                sizeof(struct ieee_types_cf_param_set));
1151                         break;
1152
1153                 case WLAN_EID_IBSS_PARAMS:
1154                         ibss_param_set =
1155                                 (struct ieee_types_ibss_param_set *)
1156                                 current_ptr;
1157                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1158                                ibss_param_set,
1159                                sizeof(struct ieee_types_ibss_param_set));
1160                         break;
1161
1162                 case WLAN_EID_ERP_INFO:
1163                         bss_entry->erp_flags = *(current_ptr + 2);
1164                         break;
1165
1166                 case WLAN_EID_EXT_SUPP_RATES:
1167                         /*
1168                          * Only process extended supported rate
1169                          * if data rate is already found.
1170                          * Data rate IE should come before
1171                          * extended supported rate IE
1172                          */
1173                         if (found_data_rate_ie) {
1174                                 if ((element_len + rate_size) >
1175                                     MWIFIEX_SUPPORTED_RATES)
1176                                         bytes_to_copy =
1177                                                 (MWIFIEX_SUPPORTED_RATES -
1178                                                  rate_size);
1179                                 else
1180                                         bytes_to_copy = element_len;
1181
1182                                 rate = (u8 *) bss_entry->data_rates;
1183                                 rate += rate_size;
1184                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1185
1186                                 rate = (u8 *) bss_entry->supported_rates;
1187                                 rate += rate_size;
1188                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1189                         }
1190                         break;
1191
1192                 case WLAN_EID_VENDOR_SPECIFIC:
1193                         vendor_ie = (struct ieee_types_vendor_specific *)
1194                                         current_ptr;
1195
1196                         if (!memcmp
1197                             (vendor_ie->vend_hdr.oui, wpa_oui,
1198                              sizeof(wpa_oui))) {
1199                                 bss_entry->bcn_wpa_ie =
1200                                         (struct ieee_types_vendor_specific *)
1201                                         current_ptr;
1202                                 bss_entry->wpa_offset = (u16) (current_ptr -
1203                                                         bss_entry->beacon_buf);
1204                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1205                                     sizeof(wmm_oui))) {
1206                                 if (total_ie_len ==
1207                                     sizeof(struct ieee_types_wmm_parameter)
1208                                     || total_ie_len ==
1209                                     sizeof(struct ieee_types_wmm_info))
1210                                         /*
1211                                          * Only accept and copy the WMM IE if
1212                                          * it matches the size expected for the
1213                                          * WMM Info IE or the WMM Parameter IE.
1214                                          */
1215                                         memcpy((u8 *) &bss_entry->wmm_ie,
1216                                                current_ptr, total_ie_len);
1217                         }
1218                         break;
1219                 case WLAN_EID_RSN:
1220                         bss_entry->bcn_rsn_ie =
1221                                 (struct ieee_types_generic *) current_ptr;
1222                         bss_entry->rsn_offset = (u16) (current_ptr -
1223                                                         bss_entry->beacon_buf);
1224                         break;
1225                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1226                         bss_entry->bcn_wapi_ie =
1227                                 (struct ieee_types_generic *) current_ptr;
1228                         bss_entry->wapi_offset = (u16) (current_ptr -
1229                                                         bss_entry->beacon_buf);
1230                         break;
1231                 case WLAN_EID_HT_CAPABILITY:
1232                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1233                                         (current_ptr +
1234                                         sizeof(struct ieee_types_header));
1235                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1236                                         sizeof(struct ieee_types_header) -
1237                                         bss_entry->beacon_buf);
1238                         break;
1239                 case WLAN_EID_HT_INFORMATION:
1240                         bss_entry->bcn_ht_info = (struct ieee80211_ht_info *)
1241                                         (current_ptr +
1242                                         sizeof(struct ieee_types_header));
1243                         bss_entry->ht_info_offset = (u16) (current_ptr +
1244                                         sizeof(struct ieee_types_header) -
1245                                         bss_entry->beacon_buf);
1246                         break;
1247                 case WLAN_EID_BSS_COEX_2040:
1248                         bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
1249                                         sizeof(struct ieee_types_header));
1250                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1251                                         sizeof(struct ieee_types_header) -
1252                                                 bss_entry->beacon_buf);
1253                         break;
1254                 case WLAN_EID_EXT_CAPABILITY:
1255                         bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
1256                                         sizeof(struct ieee_types_header));
1257                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1258                                         sizeof(struct ieee_types_header) -
1259                                         bss_entry->beacon_buf);
1260                         break;
1261                 default:
1262                         break;
1263                 }
1264
1265                 current_ptr += element_len + 2;
1266
1267                 /* Need to account for IE ID and IE Len */
1268                 bytes_left -= (element_len + 2);
1269
1270         }       /* while (bytes_left > 2) */
1271         return ret;
1272 }
1273
1274 /*
1275  * This function converts radio type scan parameter to a band configuration
1276  * to be used in join command.
1277  */
1278 static u8
1279 mwifiex_radio_type_to_band(u8 radio_type)
1280 {
1281         switch (radio_type) {
1282         case HostCmd_SCAN_RADIO_TYPE_A:
1283                 return BAND_A;
1284         case HostCmd_SCAN_RADIO_TYPE_BG:
1285         default:
1286                 return BAND_G;
1287         }
1288 }
1289
1290 /*
1291  * This is an internal function used to start a scan based on an input
1292  * configuration.
1293  *
1294  * This uses the input user scan configuration information when provided in
1295  * order to send the appropriate scan commands to firmware to populate or
1296  * update the internal driver scan table.
1297  */
1298 static int mwifiex_scan_networks(struct mwifiex_private *priv,
1299                 const struct mwifiex_user_scan_cfg *user_scan_in)
1300 {
1301         int ret = 0;
1302         struct mwifiex_adapter *adapter = priv->adapter;
1303         struct cmd_ctrl_node *cmd_node;
1304         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1305         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1306         u32 buf_size;
1307         struct mwifiex_chan_scan_param_set *scan_chan_list;
1308         u8 filtered_scan;
1309         u8 scan_current_chan_only;
1310         u8 max_chan_per_scan;
1311         unsigned long flags;
1312
1313         if (adapter->scan_processing) {
1314                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1315                 return ret;
1316         }
1317
1318         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1319         adapter->scan_processing = true;
1320         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1321
1322         if (priv->scan_block) {
1323                 dev_dbg(adapter->dev,
1324                         "cmd: Scan is blocked during association...\n");
1325                 return ret;
1326         }
1327
1328         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1329                                         GFP_KERNEL);
1330         if (!scan_cfg_out) {
1331                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1332                 return -ENOMEM;
1333         }
1334
1335         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1336                         MWIFIEX_USER_SCAN_CHAN_MAX;
1337         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1338         if (!scan_chan_list) {
1339                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1340                 kfree(scan_cfg_out);
1341                 return -ENOMEM;
1342         }
1343
1344         mwifiex_scan_setup_scan_config(priv, user_scan_in,
1345                                        &scan_cfg_out->config, &chan_list_out,
1346                                        scan_chan_list, &max_chan_per_scan,
1347                                        &filtered_scan, &scan_current_chan_only);
1348
1349         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1350                                         &scan_cfg_out->config, chan_list_out,
1351                                         scan_chan_list);
1352
1353         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1354         if (!ret) {
1355                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1356                 if (!list_empty(&adapter->scan_pending_q)) {
1357                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1358                                                 struct cmd_ctrl_node, list);
1359                         list_del(&cmd_node->list);
1360                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1361                                                                         flags);
1362                         adapter->cmd_queued = cmd_node;
1363                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1364                                                         true);
1365                 } else {
1366                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1367                                                flags);
1368                 }
1369         } else {
1370                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1371                 adapter->scan_processing = true;
1372                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1373         }
1374
1375         kfree(scan_cfg_out);
1376         kfree(scan_chan_list);
1377         return ret;
1378 }
1379
1380 /*
1381  * Sends IOCTL request to start a scan with user configurations.
1382  *
1383  * This function allocates the IOCTL request buffer, fills it
1384  * with requisite parameters and calls the IOCTL handler.
1385  *
1386  * Upon completion, it also generates a wireless event to notify
1387  * applications.
1388  */
1389 int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
1390                                 struct mwifiex_user_scan_cfg *scan_req)
1391 {
1392         int status;
1393
1394         priv->adapter->scan_wait_q_woken = false;
1395
1396         status = mwifiex_scan_networks(priv, scan_req);
1397         if (!status)
1398                 status = mwifiex_wait_queue_complete(priv->adapter);
1399
1400         return status;
1401 }
1402
1403 /*
1404  * This function prepares a scan command to be sent to the firmware.
1405  *
1406  * This uses the scan command configuration sent to the command processing
1407  * module in command preparation stage to configure a scan command structure
1408  * to send to firmware.
1409  *
1410  * The fixed fields specifying the BSS type and BSSID filters as well as a
1411  * variable number/length of TLVs are sent in the command to firmware.
1412  *
1413  * Preparation also includes -
1414  *      - Setting command ID, and proper size
1415  *      - Ensuring correct endian-ness
1416  */
1417 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1418                             struct mwifiex_scan_cmd_config *scan_cfg)
1419 {
1420         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1421
1422         /* Set fixed field variables in scan command */
1423         scan_cmd->bss_mode = scan_cfg->bss_mode;
1424         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1425                sizeof(scan_cmd->bssid));
1426         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1427
1428         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1429
1430         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1431         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1432                                           + sizeof(scan_cmd->bssid)
1433                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1434
1435         return 0;
1436 }
1437
1438 /*
1439  * This function checks compatibility of requested network with current
1440  * driver settings.
1441  */
1442 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1443                                         struct mwifiex_bssdescriptor *bss_desc)
1444 {
1445         int ret = -1;
1446
1447         if (!bss_desc)
1448                 return -1;
1449
1450         if ((mwifiex_get_cfp_by_band_and_channel_from_cfg80211(priv,
1451                         (u8) bss_desc->bss_band, (u16) bss_desc->channel))) {
1452                 switch (priv->bss_mode) {
1453                 case NL80211_IFTYPE_STATION:
1454                 case NL80211_IFTYPE_ADHOC:
1455                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1456                                                             priv->bss_mode);
1457                         if (ret)
1458                                 dev_err(priv->adapter->dev, "cannot find ssid "
1459                                         "%s\n", bss_desc->ssid.ssid);
1460                                 break;
1461                 default:
1462                                 ret = 0;
1463                 }
1464         }
1465
1466         return ret;
1467 }
1468
1469 static int
1470 mwifiex_update_curr_bss_params(struct mwifiex_private *priv, u8 *bssid,
1471                                s32 rssi, const u8 *ie_buf, size_t ie_len,
1472                                u16 beacon_period, u16 cap_info_bitmap, u8 band)
1473 {
1474         struct mwifiex_bssdescriptor *bss_desc;
1475         int ret;
1476         unsigned long flags;
1477         u8 *beacon_ie;
1478
1479         /* Allocate and fill new bss descriptor */
1480         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1481                         GFP_KERNEL);
1482         if (!bss_desc) {
1483                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1484                 return -ENOMEM;
1485         }
1486
1487         beacon_ie = kmemdup(ie_buf, ie_len, GFP_KERNEL);
1488         if (!beacon_ie) {
1489                 kfree(bss_desc);
1490                 dev_err(priv->adapter->dev, " failed to alloc beacon_ie\n");
1491                 return -ENOMEM;
1492         }
1493
1494         ret = mwifiex_fill_new_bss_desc(priv, bssid, rssi, beacon_ie,
1495                                         ie_len, beacon_period,
1496                                         cap_info_bitmap, band, bss_desc);
1497         if (ret)
1498                 goto done;
1499
1500         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1501         if (ret)
1502                 goto done;
1503
1504         /* Update current bss descriptor parameters */
1505         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1506         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1507         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1508         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1509         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1510         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1511         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1512         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1513         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1514                 0;
1515         priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL;
1516         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1517                 0;
1518         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1519                 NULL;
1520         priv->curr_bss_params.bss_descriptor.
1521                 bss_co_2040_offset = 0;
1522         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1523         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1524         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1525         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1526                 0;
1527
1528         /* Make a copy of current BSSID descriptor */
1529         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1530                 sizeof(priv->curr_bss_params.bss_descriptor));
1531         mwifiex_save_curr_bcn(priv);
1532         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1533
1534 done:
1535         kfree(bss_desc);
1536         kfree(beacon_ie);
1537         return 0;
1538 }
1539
1540 static void mwifiex_free_bss_priv(struct cfg80211_bss *bss)
1541 {
1542         kfree(bss->priv);
1543 }
1544
1545 /*
1546  * This function handles the command response of scan.
1547  *
1548  * The response buffer for the scan command has the following
1549  * memory layout:
1550  *
1551  *      .-------------------------------------------------------------.
1552  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1553  *      .-------------------------------------------------------------.
1554  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1555  *      .-------------------------------------------------------------.
1556  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1557  *      .-------------------------------------------------------------.
1558  *      |  BSSDescription data (variable, size given in BufSize)      |
1559  *      .-------------------------------------------------------------.
1560  *      |  TLV data (variable, size calculated using Header->Size,    |
1561  *      |            BufSize and sizeof the fixed fields above)       |
1562  *      .-------------------------------------------------------------.
1563  */
1564 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1565                             struct host_cmd_ds_command *resp)
1566 {
1567         int ret = 0;
1568         struct mwifiex_adapter *adapter = priv->adapter;
1569         struct cmd_ctrl_node *cmd_node;
1570         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1571         struct mwifiex_ie_types_data *tlv_data;
1572         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1573         u8 *bss_info;
1574         u32 scan_resp_size;
1575         u32 bytes_left;
1576         u32 idx;
1577         u32 tlv_buf_size;
1578         struct mwifiex_chan_freq_power *cfp;
1579         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1580         struct chan_band_param_set *chan_band;
1581         u8 is_bgscan_resp;
1582         unsigned long flags;
1583         struct cfg80211_bss *bss;
1584
1585         is_bgscan_resp = (le16_to_cpu(resp->command)
1586                 == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1587         if (is_bgscan_resp)
1588                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1589         else
1590                 scan_rsp = &resp->params.scan_resp;
1591
1592
1593         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1594                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1595                        scan_rsp->number_of_sets);
1596                 ret = -1;
1597                 goto done;
1598         }
1599
1600         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1601         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1602                                                 bytes_left);
1603
1604         scan_resp_size = le16_to_cpu(resp->size);
1605
1606         dev_dbg(adapter->dev,
1607                 "info: SCAN_RESP: returned %d APs before parsing\n",
1608                scan_rsp->number_of_sets);
1609
1610         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1611
1612         /*
1613          * The size of the TLV buffer is equal to the entire command response
1614          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1615          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1616          *   response header (S_DS_GEN)
1617          */
1618         tlv_buf_size = scan_resp_size - (bytes_left
1619                                          + sizeof(scan_rsp->bss_descript_size)
1620                                          + sizeof(scan_rsp->number_of_sets)
1621                                          + S_DS_GEN);
1622
1623         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1624                                                  bss_desc_and_tlv_buffer +
1625                                                  bytes_left);
1626
1627         /* Search the TLV buffer space in the scan response for any valid
1628            TLVs */
1629         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1630                                              TLV_TYPE_TSFTIMESTAMP,
1631                                              (struct mwifiex_ie_types_data **)
1632                                              &tsf_tlv);
1633
1634         /* Search the TLV buffer space in the scan response for any valid
1635            TLVs */
1636         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1637                                              TLV_TYPE_CHANNELBANDLIST,
1638                                              (struct mwifiex_ie_types_data **)
1639                                              &chan_band_tlv);
1640
1641         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1642                 u8 bssid[ETH_ALEN];
1643                 s32 rssi;
1644                 const u8 *ie_buf;
1645                 size_t ie_len;
1646                 int channel = -1;
1647                 u64 network_tsf = 0;
1648                 u16 beacon_size = 0;
1649                 u32 curr_bcn_bytes;
1650                 u32 freq;
1651                 u16 beacon_period;
1652                 u16 cap_info_bitmap;
1653                 u8 *current_ptr;
1654                 struct mwifiex_bcn_param *bcn_param;
1655
1656                 if (bytes_left >= sizeof(beacon_size)) {
1657                         /* Extract & convert beacon size from command buffer */
1658                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1659                         bytes_left -= sizeof(beacon_size);
1660                         bss_info += sizeof(beacon_size);
1661                 }
1662
1663                 if (!beacon_size || beacon_size > bytes_left) {
1664                         bss_info += bytes_left;
1665                         bytes_left = 0;
1666                         return -1;
1667                 }
1668
1669                 /* Initialize the current working beacon pointer for this BSS
1670                  * iteration */
1671                 current_ptr = bss_info;
1672
1673                 /* Advance the return beacon pointer past the current beacon */
1674                 bss_info += beacon_size;
1675                 bytes_left -= beacon_size;
1676
1677                 curr_bcn_bytes = beacon_size;
1678
1679                 /*
1680                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1681                  *   and capability information
1682                  */
1683                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1684                         dev_err(adapter->dev, "InterpretIE: not enough bytes left\n");
1685                         continue;
1686                 }
1687                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1688                 current_ptr += sizeof(*bcn_param);
1689                 curr_bcn_bytes -= sizeof(*bcn_param);
1690
1691                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1692
1693                 rssi = (s32) (bcn_param->rssi);
1694                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%02X\n",
1695                                         rssi);
1696
1697                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1698
1699                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1700                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1701                                 cap_info_bitmap);
1702
1703                 /* Rest of the current buffer are IE's */
1704                 ie_buf = current_ptr;
1705                 ie_len = curr_bcn_bytes;
1706                 dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP"
1707                                       " = %d\n", curr_bcn_bytes);
1708
1709                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1710                         u8 element_id, element_len;
1711
1712                         element_id = *current_ptr;
1713                         element_len = *(current_ptr + 1);
1714                         if (curr_bcn_bytes < element_len +
1715                                         sizeof(struct ieee_types_header)) {
1716                                 dev_err(priv->adapter->dev, "%s: in processing"
1717                                         " IE, bytes left < IE length\n",
1718                                         __func__);
1719                                 goto done;
1720                         }
1721                         if (element_id == WLAN_EID_DS_PARAMS) {
1722                                 channel = *(u8 *) (current_ptr +
1723                                         sizeof(struct ieee_types_header));
1724                                 break;
1725                         }
1726
1727                         current_ptr += element_len +
1728                                         sizeof(struct ieee_types_header);
1729                         curr_bcn_bytes -= element_len +
1730                                         sizeof(struct ieee_types_header);
1731                 }
1732
1733                 /*
1734                  * If the TSF TLV was appended to the scan results, save this
1735                  * entry's TSF value in the networkTSF field.The networkTSF is
1736                  * the firmware's TSF value at the time the beacon or probe
1737                  * response was received.
1738                  */
1739                 if (tsf_tlv)
1740                         memcpy(&network_tsf,
1741                                         &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1742                                         sizeof(network_tsf));
1743
1744                 if (channel != -1) {
1745                         struct ieee80211_channel *chan;
1746                         u8 band;
1747
1748                         band = BAND_G;
1749                         if (chan_band_tlv) {
1750                                 chan_band =
1751                                         &chan_band_tlv->chan_band_param[idx];
1752                                 band = mwifiex_radio_type_to_band(
1753                                                 chan_band->radio_type
1754                                                 & (BIT(0) | BIT(1)));
1755                         }
1756
1757                         cfp = mwifiex_get_cfp_by_band_and_channel_from_cfg80211(
1758                                                 priv, (u8)band, (u16)channel);
1759
1760                         freq = cfp ? cfp->freq : 0;
1761
1762                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1763
1764                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1765                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1766                                               chan, bssid, network_tsf,
1767                                               cap_info_bitmap, beacon_period,
1768                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1769                                 *(u8 *)bss->priv = band;
1770                                 bss->free_priv = mwifiex_free_bss_priv;
1771
1772                                 if (priv->media_connected && !memcmp(bssid,
1773                                         priv->curr_bss_params.bss_descriptor
1774                                                      .mac_address, ETH_ALEN))
1775                                         mwifiex_update_curr_bss_params(priv,
1776                                                         bssid, rssi, ie_buf,
1777                                                         ie_len, beacon_period,
1778                                                         cap_info_bitmap, band);
1779                         }
1780                 } else {
1781                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1782                 }
1783         }
1784
1785         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1786         if (list_empty(&adapter->scan_pending_q)) {
1787                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1788                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1789                 adapter->scan_processing = false;
1790                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1791
1792                 /* Need to indicate IOCTL complete */
1793                 if (adapter->curr_cmd->wait_q_enabled) {
1794                         adapter->cmd_wait_q.status = 0;
1795                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1796                 }
1797                 if (priv->report_scan_result)
1798                         priv->report_scan_result = false;
1799                 if (priv->scan_pending_on_block) {
1800                         priv->scan_pending_on_block = false;
1801                         up(&priv->async_sem);
1802                 }
1803
1804         } else {
1805                 /* Get scan command from scan_pending_q and put to
1806                    cmd_pending_q */
1807                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1808                                             struct cmd_ctrl_node, list);
1809                 list_del(&cmd_node->list);
1810                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1811
1812                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1813         }
1814
1815 done:
1816         return ret;
1817 }
1818
1819 /*
1820  * This function prepares command for background scan query.
1821  *
1822  * Preparation includes -
1823  *      - Setting command ID and proper size
1824  *      - Setting background scan flush parameter
1825  *      - Ensuring correct endian-ness
1826  */
1827 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1828 {
1829         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1830                 &cmd->params.bg_scan_query;
1831
1832         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1833         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1834                                 + S_DS_GEN);
1835
1836         bg_query->flush = 1;
1837
1838         return 0;
1839 }
1840
1841 /*
1842  * This function inserts scan command node to the scan pending queue.
1843  */
1844 void
1845 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1846                        struct cmd_ctrl_node *cmd_node)
1847 {
1848         struct mwifiex_adapter *adapter = priv->adapter;
1849         unsigned long flags;
1850
1851         cmd_node->wait_q_enabled = true;
1852         cmd_node->condition = &adapter->scan_wait_q_woken;
1853         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1854         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1855         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1856 }
1857
1858 /*
1859  * This function sends a scan command for all available channels to the
1860  * firmware, filtered on a specific SSID.
1861  */
1862 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1863                                       struct mwifiex_802_11_ssid *req_ssid)
1864 {
1865         struct mwifiex_adapter *adapter = priv->adapter;
1866         int ret = 0;
1867         struct mwifiex_user_scan_cfg *scan_cfg;
1868
1869         if (!req_ssid)
1870                 return -1;
1871
1872         if (adapter->scan_processing) {
1873                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1874                 return ret;
1875         }
1876
1877         if (priv->scan_block) {
1878                 dev_dbg(adapter->dev,
1879                         "cmd: Scan is blocked during association...\n");
1880                 return ret;
1881         }
1882
1883         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1884         if (!scan_cfg) {
1885                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1886                 return -ENOMEM;
1887         }
1888
1889         memcpy(scan_cfg->ssid_list[0].ssid, req_ssid->ssid,
1890                req_ssid->ssid_len);
1891
1892         ret = mwifiex_scan_networks(priv, scan_cfg);
1893
1894         kfree(scan_cfg);
1895         return ret;
1896 }
1897
1898 /*
1899  * Sends IOCTL request to start a scan.
1900  *
1901  * This function allocates the IOCTL request buffer, fills it
1902  * with requisite parameters and calls the IOCTL handler.
1903  *
1904  * Scan command can be issued for both normal scan and specific SSID
1905  * scan, depending upon whether an SSID is provided or not.
1906  */
1907 int mwifiex_request_scan(struct mwifiex_private *priv,
1908                          struct mwifiex_802_11_ssid *req_ssid)
1909 {
1910         int ret;
1911
1912         if (down_interruptible(&priv->async_sem)) {
1913                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1914                                                 __func__);
1915                 return -1;
1916         }
1917         priv->scan_pending_on_block = true;
1918
1919         priv->adapter->scan_wait_q_woken = false;
1920
1921         if (req_ssid && req_ssid->ssid_len != 0)
1922                 /* Specific SSID scan */
1923                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1924         else
1925                 /* Normal scan */
1926                 ret = mwifiex_scan_networks(priv, NULL);
1927
1928         if (!ret)
1929                 ret = mwifiex_wait_queue_complete(priv->adapter);
1930
1931         if (ret == -1) {
1932                 priv->scan_pending_on_block = false;
1933                 up(&priv->async_sem);
1934         }
1935
1936         return ret;
1937 }
1938
1939 /*
1940  * This function appends the vendor specific IE TLV to a buffer.
1941  */
1942 int
1943 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1944                             u16 vsie_mask, u8 **buffer)
1945 {
1946         int id, ret_len = 0;
1947         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1948
1949         if (!buffer)
1950                 return 0;
1951         if (!(*buffer))
1952                 return 0;
1953
1954         /*
1955          * Traverse through the saved vendor specific IE array and append
1956          * the selected(scan/assoc/adhoc) IE as TLV to the command
1957          */
1958         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1959                 if (priv->vs_ie[id].mask & vsie_mask) {
1960                         vs_param_set =
1961                                 (struct mwifiex_ie_types_vendor_param_set *)
1962                                 *buffer;
1963                         vs_param_set->header.type =
1964                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1965                         vs_param_set->header.len =
1966                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1967                                 & 0x00FF) + 2);
1968                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1969                                le16_to_cpu(vs_param_set->header.len));
1970                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1971                                    sizeof(struct mwifiex_ie_types_header);
1972                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1973                                    sizeof(struct mwifiex_ie_types_header);
1974                 }
1975         }
1976         return ret_len;
1977 }
1978
1979 /*
1980  * This function saves a beacon buffer of the current BSS descriptor.
1981  *
1982  * The current beacon buffer is saved so that it can be restored in the
1983  * following cases that makes the beacon buffer not to contain the current
1984  * ssid's beacon buffer.
1985  *      - The current ssid was not found somehow in the last scan.
1986  *      - The current ssid was the last entry of the scan table and overloaded.
1987  */
1988 void
1989 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1990 {
1991         struct mwifiex_bssdescriptor *curr_bss =
1992                 &priv->curr_bss_params.bss_descriptor;
1993
1994         if (!curr_bss->beacon_buf_size)
1995                 return;
1996
1997         /* allocate beacon buffer at 1st time; or if it's size has changed */
1998         if (!priv->curr_bcn_buf ||
1999                         priv->curr_bcn_size != curr_bss->beacon_buf_size) {
2000                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
2001
2002                 kfree(priv->curr_bcn_buf);
2003                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
2004                                                 GFP_KERNEL);
2005                 if (!priv->curr_bcn_buf) {
2006                         dev_err(priv->adapter->dev,
2007                                         "failed to alloc curr_bcn_buf\n");
2008                         return;
2009                 }
2010         }
2011
2012         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2013                 curr_bss->beacon_buf_size);
2014         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2015                 priv->curr_bcn_size);
2016
2017         curr_bss->beacon_buf = priv->curr_bcn_buf;
2018
2019         /* adjust the pointers in the current BSS descriptor */
2020         if (curr_bss->bcn_wpa_ie)
2021                 curr_bss->bcn_wpa_ie =
2022                         (struct ieee_types_vendor_specific *)
2023                         (curr_bss->beacon_buf +
2024                          curr_bss->wpa_offset);
2025
2026         if (curr_bss->bcn_rsn_ie)
2027                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2028                         (curr_bss->beacon_buf +
2029                          curr_bss->rsn_offset);
2030
2031         if (curr_bss->bcn_ht_cap)
2032                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2033                         (curr_bss->beacon_buf +
2034                          curr_bss->ht_cap_offset);
2035
2036         if (curr_bss->bcn_ht_info)
2037                 curr_bss->bcn_ht_info = (struct ieee80211_ht_info *)
2038                         (curr_bss->beacon_buf +
2039                          curr_bss->ht_info_offset);
2040
2041         if (curr_bss->bcn_bss_co_2040)
2042                 curr_bss->bcn_bss_co_2040 =
2043                         (u8 *) (curr_bss->beacon_buf +
2044                                         curr_bss->bss_co_2040_offset);
2045
2046         if (curr_bss->bcn_ext_cap)
2047                 curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf +
2048                                 curr_bss->ext_cap_offset);
2049 }
2050
2051 /*
2052  * This function frees the current BSS descriptor beacon buffer.
2053  */
2054 void
2055 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2056 {
2057         kfree(priv->curr_bcn_buf);
2058         priv->curr_bcn_buf = NULL;
2059 }