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                         wildcard_ssid_tlv->max_ssid_length =
 823                                 user_scan_in->ssid_list[ssid_idx].max_len;
 824
 825                         memcpy(wildcard_ssid_tlv->ssid,
 826                                user_scan_in->ssid_list[ssid_idx].ssid,
 827                                ssid_len);
 828
 829                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 830                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 831
 832                         dev_dbg(adapter->dev, "info: scan: ssid_list[%d]: %s, %d\n",
 833                                 ssid_idx, wildcard_ssid_tlv->ssid,
 834                                 wildcard_ssid_tlv->max_ssid_length);
 835
 836                         /* Empty wildcard ssid with a maxlen will match many or
 837                            potentially all SSIDs (maxlen == 32), therefore do
 838                            not treat the scan as
 839                            filtered. */
 840                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 841                                 ssid_filter = false;
 842
 843                 }
 844
 845                 /*
 846                  *  The default number of channels sent in the command is low to
 847                  *  ensure the response buffer from the firmware does not
 848                  *  truncate scan results.  That is not an issue with an SSID
 849                  *  or BSSID filter applied to the scan results in the firmware.
 850                  */
 851                 if ((ssid_idx && ssid_filter)
 852                     || memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 853                               sizeof(zero_mac)))
 854                         *filtered_scan = true;
 855         } else {
 856                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 857                 num_probes = adapter->scan_probes;
 858         }
 859
 860         /*
 861          *  If a specific BSSID or SSID is used, the number of channels in the
 862          *  scan command will be increased to the absolute maximum.
 863          */
 864         if (*filtered_scan)
 865                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 866         else
 867                 *max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD;
 868
 869         /* If the input config or adapter has the number of Probes set,
 870            add tlv */
 871         if (num_probes) {
 872
 873                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 874                                                 num_probes);
 875
 876                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 877                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 878                 num_probes_tlv->header.len =
 879                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 880                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 881
 882                 tlv_pos += sizeof(num_probes_tlv->header) +
 883                         le16_to_cpu(num_probes_tlv->header.len);
 884
 885         }
 886
 887         /* Append rates tlv */
 888         memset(rates, 0, sizeof(rates));
 889
 890         rates_size = mwifiex_get_supported_rates(priv, rates);
 891
 892         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 893         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 894         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 895         memcpy(rates_tlv->rates, rates, rates_size);
 896         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 897
 898         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 899
 900         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info)
 901             && (priv->adapter->config_bands & BAND_GN
 902                 || priv->adapter->config_bands & BAND_AN)) {
 903                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 904                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 905                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 906                 ht_cap->header.len =
 907                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 908                 radio_type =
 909                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 910                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 911                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 912         }
 913
 914         /* Append vendor specific IE TLV */
 915         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 916
 917         /*
 918          * Set the output for the channel TLV to the address in the tlv buffer
 919          *   past any TLVs that were added in this function (SSID, num_probes).
 920          *   Channel TLVs will be added past this for each scan command,
 921          *   preserving the TLVs that were previously added.
 922          */
 923         *chan_list_out =
 924                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 925
 926         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 927
 928                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 929
 930                 for (chan_idx = 0;
 931                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX
 932                      && user_scan_in->chan_list[chan_idx].chan_number;
 933                      chan_idx++) {
 934
 935                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 936                         (scan_chan_list + chan_idx)->chan_number = channel;
 937
 938                         radio_type =
 939                                 user_scan_in->chan_list[chan_idx].radio_type;
 940                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 941
 942                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 943
 944                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 945                                 (scan_chan_list +
 946                                  chan_idx)->chan_scan_mode_bitmap
 947                                         |= MWIFIEX_PASSIVE_SCAN;
 948                         else
 949                                 (scan_chan_list +
 950                                  chan_idx)->chan_scan_mode_bitmap
 951                                         &= ~MWIFIEX_PASSIVE_SCAN;
 952
 953                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 954                                 scan_dur = (u16) user_scan_in->
 955                                         chan_list[chan_idx].scan_time;
 956                         } else {
 957                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 958                                         scan_dur = adapter->passive_scan_time;
 959                                 else if (*filtered_scan)
 960                                         scan_dur = adapter->specific_scan_time;
 961                                 else
 962                                         scan_dur = adapter->active_scan_time;
 963                         }
 964
 965                         (scan_chan_list + chan_idx)->min_scan_time =
 966                                 cpu_to_le16(scan_dur);
 967                         (scan_chan_list + chan_idx)->max_scan_time =
 968                                 cpu_to_le16(scan_dur);
 969                 }
 970
 971                 /* Check if we are only scanning the current channel */
 972                 if ((chan_idx == 1)
 973                     && (user_scan_in->chan_list[0].chan_number
 974                         == priv->curr_bss_params.bss_descriptor.channel)) {
 975                         *scan_current_only = true;
 976                         dev_dbg(adapter->dev,
 977                                 "info: Scan: Scanning current channel only\n");
 978                 }
 979
 980         } else {
 981                 dev_dbg(adapter->dev,
 982                                 "info: Scan: Creating full region channel list\n");
 983                 mwifiex_scan_create_channel_list(priv, user_scan_in,
 984                                                  scan_chan_list,
 985                                                  *filtered_scan);
 986         }
 987 }
 988
 989 /*
 990  * This function inspects the scan response buffer for pointers to
 991  * expected TLVs.
 992  *
 993  * TLVs can be included at the end of the scan response BSS information.
 994  *
 995  * Data in the buffer is parsed pointers to TLVs that can potentially
 996  * be passed back in the response.
 997  */
 998 static void
 999 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1000                                      struct mwifiex_ie_types_data *tlv,
1001                                      u32 tlv_buf_size, u32 req_tlv_type,
1002                                      struct mwifiex_ie_types_data **tlv_data)
1003 {
1004         struct mwifiex_ie_types_data *current_tlv;
1005         u32 tlv_buf_left;
1006         u32 tlv_type;
1007         u32 tlv_len;
1008
1009         current_tlv = tlv;
1010         tlv_buf_left = tlv_buf_size;
1011         *tlv_data = NULL;
1012
1013         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1014                                                 tlv_buf_size);
1015
1016         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1017
1018                 tlv_type = le16_to_cpu(current_tlv->header.type);
1019                 tlv_len = le16_to_cpu(current_tlv->header.len);
1020
1021                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1022                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1023                         break;
1024                 }
1025
1026                 if (req_tlv_type == tlv_type) {
1027                         switch (tlv_type) {
1028                         case TLV_TYPE_TSFTIMESTAMP:
1029                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1030                                         "timestamp TLV, len = %d\n", tlv_len);
1031                                 *tlv_data = (struct mwifiex_ie_types_data *)
1032                                         current_tlv;
1033                                 break;
1034                         case TLV_TYPE_CHANNELBANDLIST:
1035                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1036                                         " band list TLV, len = %d\n", tlv_len);
1037                                 *tlv_data = (struct mwifiex_ie_types_data *)
1038                                         current_tlv;
1039                                 break;
1040                         default:
1041                                 dev_err(adapter->dev,
1042                                         "SCAN_RESP: unhandled TLV = %d\n",
1043                                        tlv_type);
1044                                 /* Give up, this seems corrupted */
1045                                 return;
1046                         }
1047                 }
1048
1049                 if (*tlv_data)
1050                         break;
1051
1052
1053                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1054                 current_tlv =
1055                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1056                                                           tlv_len);
1057
1058         }                       /* while */
1059 }
1060
1061 /*
1062  * This function parses provided beacon buffer and updates
1063  * respective fields in bss descriptor structure.
1064  */
1065 int
1066 mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1067                                 struct mwifiex_bssdescriptor *bss_entry,
1068                                 u8 *ie_buf, u32 ie_len)
1069 {
1070         int ret = 0;
1071         u8 element_id;
1072         struct ieee_types_fh_param_set *fh_param_set;
1073         struct ieee_types_ds_param_set *ds_param_set;
1074         struct ieee_types_cf_param_set *cf_param_set;
1075         struct ieee_types_ibss_param_set *ibss_param_set;
1076         u8 *current_ptr;
1077         u8 *rate;
1078         u8 element_len;
1079         u16 total_ie_len;
1080         u8 bytes_to_copy;
1081         u8 rate_size;
1082         u8 found_data_rate_ie;
1083         u32 bytes_left;
1084         struct ieee_types_vendor_specific *vendor_ie;
1085         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1086         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1087
1088         found_data_rate_ie = false;
1089         rate_size = 0;
1090         current_ptr = ie_buf;
1091         bytes_left = ie_len;
1092         bss_entry->beacon_buf = ie_buf;
1093         bss_entry->beacon_buf_size = ie_len;
1094
1095         /* Process variable IE */
1096         while (bytes_left >= 2) {
1097                 element_id = *current_ptr;
1098                 element_len = *(current_ptr + 1);
1099                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1100
1101                 if (bytes_left < total_ie_len) {
1102                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1103                                 " IE, bytes left < IE length\n");
1104                         return -1;
1105                 }
1106                 switch (element_id) {
1107                 case WLAN_EID_SSID:
1108                         bss_entry->ssid.ssid_len = element_len;
1109                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1110                                element_len);
1111                         dev_dbg(adapter->dev, "info: InterpretIE: ssid: "
1112                                               "%-32s\n", bss_entry->ssid.ssid);
1113                         break;
1114
1115                 case WLAN_EID_SUPP_RATES:
1116                         memcpy(bss_entry->data_rates, current_ptr + 2,
1117                                element_len);
1118                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1119                                element_len);
1120                         rate_size = element_len;
1121                         found_data_rate_ie = true;
1122                         break;
1123
1124                 case WLAN_EID_FH_PARAMS:
1125                         fh_param_set =
1126                                 (struct ieee_types_fh_param_set *) current_ptr;
1127                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1128                                fh_param_set,
1129                                sizeof(struct ieee_types_fh_param_set));
1130                         break;
1131
1132                 case WLAN_EID_DS_PARAMS:
1133                         ds_param_set =
1134                                 (struct ieee_types_ds_param_set *) current_ptr;
1135
1136                         bss_entry->channel = ds_param_set->current_chan;
1137
1138                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1139                                ds_param_set,
1140                                sizeof(struct ieee_types_ds_param_set));
1141                         break;
1142
1143                 case WLAN_EID_CF_PARAMS:
1144                         cf_param_set =
1145                                 (struct ieee_types_cf_param_set *) current_ptr;
1146                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1147                                cf_param_set,
1148                                sizeof(struct ieee_types_cf_param_set));
1149                         break;
1150
1151                 case WLAN_EID_IBSS_PARAMS:
1152                         ibss_param_set =
1153                                 (struct ieee_types_ibss_param_set *)
1154                                 current_ptr;
1155                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1156                                ibss_param_set,
1157                                sizeof(struct ieee_types_ibss_param_set));
1158                         break;
1159
1160                 case WLAN_EID_ERP_INFO:
1161                         bss_entry->erp_flags = *(current_ptr + 2);
1162                         break;
1163
1164                 case WLAN_EID_EXT_SUPP_RATES:
1165                         /*
1166                          * Only process extended supported rate
1167                          * if data rate is already found.
1168                          * Data rate IE should come before
1169                          * extended supported rate IE
1170                          */
1171                         if (found_data_rate_ie) {
1172                                 if ((element_len + rate_size) >
1173                                     MWIFIEX_SUPPORTED_RATES)
1174                                         bytes_to_copy =
1175                                                 (MWIFIEX_SUPPORTED_RATES -
1176                                                  rate_size);
1177                                 else
1178                                         bytes_to_copy = element_len;
1179
1180                                 rate = (u8 *) bss_entry->data_rates;
1181                                 rate += rate_size;
1182                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1183
1184                                 rate = (u8 *) bss_entry->supported_rates;
1185                                 rate += rate_size;
1186                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1187                         }
1188                         break;
1189
1190                 case WLAN_EID_VENDOR_SPECIFIC:
1191                         vendor_ie = (struct ieee_types_vendor_specific *)
1192                                         current_ptr;
1193
1194                         if (!memcmp
1195                             (vendor_ie->vend_hdr.oui, wpa_oui,
1196                              sizeof(wpa_oui))) {
1197                                 bss_entry->bcn_wpa_ie =
1198                                         (struct ieee_types_vendor_specific *)
1199                                         current_ptr;
1200                                 bss_entry->wpa_offset = (u16) (current_ptr -
1201                                                         bss_entry->beacon_buf);
1202                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1203                                     sizeof(wmm_oui))) {
1204                                 if (total_ie_len ==
1205                                     sizeof(struct ieee_types_wmm_parameter)
1206                                     || total_ie_len ==
1207                                     sizeof(struct ieee_types_wmm_info))
1208                                         /*
1209                                          * Only accept and copy the WMM IE if
1210                                          * it matches the size expected for the
1211                                          * WMM Info IE or the WMM Parameter IE.
1212                                          */
1213                                         memcpy((u8 *) &bss_entry->wmm_ie,
1214                                                current_ptr, total_ie_len);
1215                         }
1216                         break;
1217                 case WLAN_EID_RSN:
1218                         bss_entry->bcn_rsn_ie =
1219                                 (struct ieee_types_generic *) current_ptr;
1220                         bss_entry->rsn_offset = (u16) (current_ptr -
1221                                                         bss_entry->beacon_buf);
1222                         break;
1223                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1224                         bss_entry->bcn_wapi_ie =
1225                                 (struct ieee_types_generic *) current_ptr;
1226                         bss_entry->wapi_offset = (u16) (current_ptr -
1227                                                         bss_entry->beacon_buf);
1228                         break;
1229                 case WLAN_EID_HT_CAPABILITY:
1230                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1231                                         (current_ptr +
1232                                         sizeof(struct ieee_types_header));
1233                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1234                                         sizeof(struct ieee_types_header) -
1235                                         bss_entry->beacon_buf);
1236                         break;
1237                 case WLAN_EID_HT_INFORMATION:
1238                         bss_entry->bcn_ht_info = (struct ieee80211_ht_info *)
1239                                         (current_ptr +
1240                                         sizeof(struct ieee_types_header));
1241                         bss_entry->ht_info_offset = (u16) (current_ptr +
1242                                         sizeof(struct ieee_types_header) -
1243                                         bss_entry->beacon_buf);
1244                         break;
1245                 case WLAN_EID_BSS_COEX_2040:
1246                         bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
1247                                         sizeof(struct ieee_types_header));
1248                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1249                                         sizeof(struct ieee_types_header) -
1250                                                 bss_entry->beacon_buf);
1251                         break;
1252                 case WLAN_EID_EXT_CAPABILITY:
1253                         bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
1254                                         sizeof(struct ieee_types_header));
1255                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1256                                         sizeof(struct ieee_types_header) -
1257                                         bss_entry->beacon_buf);
1258                         break;
1259                 default:
1260                         break;
1261                 }
1262
1263                 current_ptr += element_len + 2;
1264
1265                 /* Need to account for IE ID and IE Len */
1266                 bytes_left -= (element_len + 2);
1267
1268         }       /* while (bytes_left > 2) */
1269         return ret;
1270 }
1271
1272 /*
1273  * This function converts radio type scan parameter to a band configuration
1274  * to be used in join command.
1275  */
1276 static u8
1277 mwifiex_radio_type_to_band(u8 radio_type)
1278 {
1279         switch (radio_type) {
1280         case HostCmd_SCAN_RADIO_TYPE_A:
1281                 return BAND_A;
1282         case HostCmd_SCAN_RADIO_TYPE_BG:
1283         default:
1284                 return BAND_G;
1285         }
1286 }
1287
1288 /*
1289  * This is an internal function used to start a scan based on an input
1290  * configuration.
1291  *
1292  * This uses the input user scan configuration information when provided in
1293  * order to send the appropriate scan commands to firmware to populate or
1294  * update the internal driver scan table.
1295  */
1296 static int mwifiex_scan_networks(struct mwifiex_private *priv,
1297                 const struct mwifiex_user_scan_cfg *user_scan_in)
1298 {
1299         int ret = 0;
1300         struct mwifiex_adapter *adapter = priv->adapter;
1301         struct cmd_ctrl_node *cmd_node;
1302         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1303         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1304         u32 buf_size;
1305         struct mwifiex_chan_scan_param_set *scan_chan_list;
1306         u8 filtered_scan;
1307         u8 scan_current_chan_only;
1308         u8 max_chan_per_scan;
1309         unsigned long flags;
1310
1311         if (adapter->scan_processing) {
1312                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1313                 return ret;
1314         }
1315
1316         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1317         adapter->scan_processing = true;
1318         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1319
1320         if (priv->scan_block) {
1321                 dev_dbg(adapter->dev,
1322                         "cmd: Scan is blocked during association...\n");
1323                 return ret;
1324         }
1325
1326         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1327                                         GFP_KERNEL);
1328         if (!scan_cfg_out) {
1329                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1330                 return -ENOMEM;
1331         }
1332
1333         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1334                         MWIFIEX_USER_SCAN_CHAN_MAX;
1335         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1336         if (!scan_chan_list) {
1337                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1338                 kfree(scan_cfg_out);
1339                 return -ENOMEM;
1340         }
1341
1342         mwifiex_scan_setup_scan_config(priv, user_scan_in,
1343                                        &scan_cfg_out->config, &chan_list_out,
1344                                        scan_chan_list, &max_chan_per_scan,
1345                                        &filtered_scan, &scan_current_chan_only);
1346
1347         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1348                                         &scan_cfg_out->config, chan_list_out,
1349                                         scan_chan_list);
1350
1351         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1352         if (!ret) {
1353                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1354                 if (!list_empty(&adapter->scan_pending_q)) {
1355                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1356                                                 struct cmd_ctrl_node, list);
1357                         list_del(&cmd_node->list);
1358                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1359                                                                         flags);
1360                         adapter->cmd_queued = cmd_node;
1361                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1362                                                         true);
1363                 } else {
1364                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1365                                                flags);
1366                 }
1367         } else {
1368                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1369                 adapter->scan_processing = true;
1370                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1371         }
1372
1373         kfree(scan_cfg_out);
1374         kfree(scan_chan_list);
1375         return ret;
1376 }
1377
1378 /*
1379  * Sends IOCTL request to start a scan with user configurations.
1380  *
1381  * This function allocates the IOCTL request buffer, fills it
1382  * with requisite parameters and calls the IOCTL handler.
1383  *
1384  * Upon completion, it also generates a wireless event to notify
1385  * applications.
1386  */
1387 int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
1388                                 struct mwifiex_user_scan_cfg *scan_req)
1389 {
1390         int status;
1391
1392         priv->adapter->scan_wait_q_woken = false;
1393
1394         status = mwifiex_scan_networks(priv, scan_req);
1395         if (!status)
1396                 status = mwifiex_wait_queue_complete(priv->adapter);
1397
1398         return status;
1399 }
1400
1401 /*
1402  * This function prepares a scan command to be sent to the firmware.
1403  *
1404  * This uses the scan command configuration sent to the command processing
1405  * module in command preparation stage to configure a scan command structure
1406  * to send to firmware.
1407  *
1408  * The fixed fields specifying the BSS type and BSSID filters as well as a
1409  * variable number/length of TLVs are sent in the command to firmware.
1410  *
1411  * Preparation also includes -
1412  *      - Setting command ID, and proper size
1413  *      - Ensuring correct endian-ness
1414  */
1415 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1416                             struct mwifiex_scan_cmd_config *scan_cfg)
1417 {
1418         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1419
1420         /* Set fixed field variables in scan command */
1421         scan_cmd->bss_mode = scan_cfg->bss_mode;
1422         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1423                sizeof(scan_cmd->bssid));
1424         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1425
1426         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1427
1428         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1429         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1430                                           + sizeof(scan_cmd->bssid)
1431                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1432
1433         return 0;
1434 }
1435
1436 /*
1437  * This function checks compatibility of requested network with current
1438  * driver settings.
1439  */
1440 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1441                                         struct mwifiex_bssdescriptor *bss_desc)
1442 {
1443         int ret = -1;
1444
1445         if (!bss_desc)
1446                 return -1;
1447
1448         if ((mwifiex_get_cfp_by_band_and_channel_from_cfg80211(priv,
1449                         (u8) bss_desc->bss_band, (u16) bss_desc->channel))) {
1450                 switch (priv->bss_mode) {
1451                 case NL80211_IFTYPE_STATION:
1452                 case NL80211_IFTYPE_ADHOC:
1453                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1454                                                             priv->bss_mode);
1455                         if (ret)
1456                                 dev_err(priv->adapter->dev, "cannot find ssid "
1457                                         "%s\n", bss_desc->ssid.ssid);
1458                                 break;
1459                 default:
1460                                 ret = 0;
1461                 }
1462         }
1463
1464         return ret;
1465 }
1466
1467 static int
1468 mwifiex_update_curr_bss_params(struct mwifiex_private *priv, u8 *bssid,
1469                                s32 rssi, const u8 *ie_buf, size_t ie_len,
1470                                u16 beacon_period, u16 cap_info_bitmap, u8 band)
1471 {
1472         struct mwifiex_bssdescriptor *bss_desc;
1473         int ret;
1474         unsigned long flags;
1475         u8 *beacon_ie;
1476
1477         /* Allocate and fill new bss descriptor */
1478         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1479                         GFP_KERNEL);
1480         if (!bss_desc) {
1481                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1482                 return -ENOMEM;
1483         }
1484
1485         beacon_ie = kmemdup(ie_buf, ie_len, GFP_KERNEL);
1486         if (!beacon_ie) {
1487                 kfree(bss_desc);
1488                 dev_err(priv->adapter->dev, " failed to alloc beacon_ie\n");
1489                 return -ENOMEM;
1490         }
1491
1492         ret = mwifiex_fill_new_bss_desc(priv, bssid, rssi, beacon_ie,
1493                                         ie_len, beacon_period,
1494                                         cap_info_bitmap, band, bss_desc);
1495         if (ret)
1496                 goto done;
1497
1498         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1499         if (ret)
1500                 goto done;
1501
1502         /* Update current bss descriptor parameters */
1503         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1504         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1505         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1506         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1507         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1508         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1509         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1510         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1511         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1512                 0;
1513         priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL;
1514         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1515                 0;
1516         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1517                 NULL;
1518         priv->curr_bss_params.bss_descriptor.
1519                 bss_co_2040_offset = 0;
1520         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1521         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1522         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1523         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1524                 0;
1525
1526         /* Make a copy of current BSSID descriptor */
1527         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1528                 sizeof(priv->curr_bss_params.bss_descriptor));
1529         mwifiex_save_curr_bcn(priv);
1530         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1531
1532 done:
1533         kfree(bss_desc);
1534         kfree(beacon_ie);
1535         return 0;
1536 }
1537
1538 /*
1539  * This function handles the command response of scan.
1540  *
1541  * The response buffer for the scan command has the following
1542  * memory layout:
1543  *
1544  *      .-------------------------------------------------------------.
1545  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1546  *      .-------------------------------------------------------------.
1547  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1548  *      .-------------------------------------------------------------.
1549  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1550  *      .-------------------------------------------------------------.
1551  *      |  BSSDescription data (variable, size given in BufSize)      |
1552  *      .-------------------------------------------------------------.
1553  *      |  TLV data (variable, size calculated using Header->Size,    |
1554  *      |            BufSize and sizeof the fixed fields above)       |
1555  *      .-------------------------------------------------------------.
1556  */
1557 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1558                             struct host_cmd_ds_command *resp)
1559 {
1560         int ret = 0;
1561         struct mwifiex_adapter *adapter = priv->adapter;
1562         struct cmd_ctrl_node *cmd_node;
1563         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1564         struct mwifiex_ie_types_data *tlv_data;
1565         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1566         u8 *bss_info;
1567         u32 scan_resp_size;
1568         u32 bytes_left;
1569         u32 idx;
1570         u32 tlv_buf_size;
1571         struct mwifiex_chan_freq_power *cfp;
1572         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1573         struct chan_band_param_set *chan_band;
1574         u8 is_bgscan_resp;
1575         unsigned long flags;
1576         struct cfg80211_bss *bss;
1577
1578         is_bgscan_resp = (le16_to_cpu(resp->command)
1579                 == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1580         if (is_bgscan_resp)
1581                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1582         else
1583                 scan_rsp = &resp->params.scan_resp;
1584
1585
1586         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1587                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1588                        scan_rsp->number_of_sets);
1589                 ret = -1;
1590                 goto done;
1591         }
1592
1593         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1594         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1595                                                 bytes_left);
1596
1597         scan_resp_size = le16_to_cpu(resp->size);
1598
1599         dev_dbg(adapter->dev,
1600                 "info: SCAN_RESP: returned %d APs before parsing\n",
1601                scan_rsp->number_of_sets);
1602
1603         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1604
1605         /*
1606          * The size of the TLV buffer is equal to the entire command response
1607          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1608          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1609          *   response header (S_DS_GEN)
1610          */
1611         tlv_buf_size = scan_resp_size - (bytes_left
1612                                          + sizeof(scan_rsp->bss_descript_size)
1613                                          + sizeof(scan_rsp->number_of_sets)
1614                                          + S_DS_GEN);
1615
1616         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1617                                                  bss_desc_and_tlv_buffer +
1618                                                  bytes_left);
1619
1620         /* Search the TLV buffer space in the scan response for any valid
1621            TLVs */
1622         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1623                                              TLV_TYPE_TSFTIMESTAMP,
1624                                              (struct mwifiex_ie_types_data **)
1625                                              &tsf_tlv);
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_CHANNELBANDLIST,
1631                                              (struct mwifiex_ie_types_data **)
1632                                              &chan_band_tlv);
1633
1634         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1635                 u8 bssid[ETH_ALEN];
1636                 s32 rssi;
1637                 const u8 *ie_buf;
1638                 size_t ie_len;
1639                 int channel = -1;
1640                 u64 network_tsf = 0;
1641                 u16 beacon_size = 0;
1642                 u32 curr_bcn_bytes;
1643                 u32 freq;
1644                 u16 beacon_period;
1645                 u16 cap_info_bitmap;
1646                 u8 *current_ptr;
1647                 struct mwifiex_bcn_param *bcn_param;
1648
1649                 if (bytes_left >= sizeof(beacon_size)) {
1650                         /* Extract & convert beacon size from command buffer */
1651                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1652                         bytes_left -= sizeof(beacon_size);
1653                         bss_info += sizeof(beacon_size);
1654                 }
1655
1656                 if (!beacon_size || beacon_size > bytes_left) {
1657                         bss_info += bytes_left;
1658                         bytes_left = 0;
1659                         return -1;
1660                 }
1661
1662                 /* Initialize the current working beacon pointer for this BSS
1663                  * iteration */
1664                 current_ptr = bss_info;
1665
1666                 /* Advance the return beacon pointer past the current beacon */
1667                 bss_info += beacon_size;
1668                 bytes_left -= beacon_size;
1669
1670                 curr_bcn_bytes = beacon_size;
1671
1672                 /*
1673                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1674                  *   and capability information
1675                  */
1676                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1677                         dev_err(adapter->dev, "InterpretIE: not enough bytes left\n");
1678                         continue;
1679                 }
1680                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1681                 current_ptr += sizeof(*bcn_param);
1682                 curr_bcn_bytes -= sizeof(*bcn_param);
1683
1684                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1685
1686                 rssi = (s32) (bcn_param->rssi);
1687                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%02X\n",
1688                                         rssi);
1689
1690                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1691
1692                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1693                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1694                                 cap_info_bitmap);
1695
1696                 /* Rest of the current buffer are IE's */
1697                 ie_buf = current_ptr;
1698                 ie_len = curr_bcn_bytes;
1699                 dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP"
1700                                       " = %d\n", curr_bcn_bytes);
1701
1702                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1703                         u8 element_id, element_len;
1704
1705                         element_id = *current_ptr;
1706                         element_len = *(current_ptr + 1);
1707                         if (curr_bcn_bytes < element_len +
1708                                         sizeof(struct ieee_types_header)) {
1709                                 dev_err(priv->adapter->dev, "%s: in processing"
1710                                         " IE, bytes left < IE length\n",
1711                                         __func__);
1712                                 goto done;
1713                         }
1714                         if (element_id == WLAN_EID_DS_PARAMS) {
1715                                 channel = *(u8 *) (current_ptr +
1716                                         sizeof(struct ieee_types_header));
1717                                 break;
1718                         }
1719
1720                         current_ptr += element_len +
1721                                         sizeof(struct ieee_types_header);
1722                         curr_bcn_bytes -= element_len +
1723                                         sizeof(struct ieee_types_header);
1724                 }
1725
1726                 /*
1727                  * If the TSF TLV was appended to the scan results, save this
1728                  * entry's TSF value in the networkTSF field.The networkTSF is
1729                  * the firmware's TSF value at the time the beacon or probe
1730                  * response was received.
1731                  */
1732                 if (tsf_tlv)
1733                         memcpy(&network_tsf,
1734                                         &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1735                                         sizeof(network_tsf));
1736
1737                 if (channel != -1) {
1738                         struct ieee80211_channel *chan;
1739                         u8 band;
1740
1741                         band = BAND_G;
1742                         if (chan_band_tlv) {
1743                                 chan_band =
1744                                         &chan_band_tlv->chan_band_param[idx];
1745                                 band = mwifiex_radio_type_to_band(
1746                                                 chan_band->radio_type
1747                                                 & (BIT(0) | BIT(1)));
1748                         }
1749
1750                         cfp = mwifiex_get_cfp_by_band_and_channel_from_cfg80211(
1751                                                 priv, (u8)band, (u16)channel);
1752
1753                         freq = cfp ? cfp->freq : 0;
1754
1755                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1756
1757                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1758                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1759                                               chan, bssid, network_tsf,
1760                                               cap_info_bitmap, beacon_period,
1761                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1762                                 *(u8 *)bss->priv = band;
1763                                 cfg80211_put_bss(bss);
1764
1765                                 if (priv->media_connected && !memcmp(bssid,
1766                                         priv->curr_bss_params.bss_descriptor
1767                                                      .mac_address, ETH_ALEN))
1768                                         mwifiex_update_curr_bss_params(priv,
1769                                                         bssid, rssi, ie_buf,
1770                                                         ie_len, beacon_period,
1771                                                         cap_info_bitmap, band);
1772                         }
1773                 } else {
1774                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1775                 }
1776         }
1777
1778         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1779         if (list_empty(&adapter->scan_pending_q)) {
1780                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1781                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1782                 adapter->scan_processing = false;
1783                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1784
1785                 /* Need to indicate IOCTL complete */
1786                 if (adapter->curr_cmd->wait_q_enabled) {
1787                         adapter->cmd_wait_q.status = 0;
1788                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1789                 }
1790                 if (priv->report_scan_result)
1791                         priv->report_scan_result = false;
1792                 if (priv->scan_pending_on_block) {
1793                         priv->scan_pending_on_block = false;
1794                         up(&priv->async_sem);
1795                 }
1796
1797         } else {
1798                 /* Get scan command from scan_pending_q and put to
1799                    cmd_pending_q */
1800                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1801                                             struct cmd_ctrl_node, list);
1802                 list_del(&cmd_node->list);
1803                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1804
1805                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1806         }
1807
1808 done:
1809         return ret;
1810 }
1811
1812 /*
1813  * This function prepares command for background scan query.
1814  *
1815  * Preparation includes -
1816  *      - Setting command ID and proper size
1817  *      - Setting background scan flush parameter
1818  *      - Ensuring correct endian-ness
1819  */
1820 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1821 {
1822         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1823                 &cmd->params.bg_scan_query;
1824
1825         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1826         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1827                                 + S_DS_GEN);
1828
1829         bg_query->flush = 1;
1830
1831         return 0;
1832 }
1833
1834 /*
1835  * This function inserts scan command node to the scan pending queue.
1836  */
1837 void
1838 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1839                        struct cmd_ctrl_node *cmd_node)
1840 {
1841         struct mwifiex_adapter *adapter = priv->adapter;
1842         unsigned long flags;
1843
1844         cmd_node->wait_q_enabled = true;
1845         cmd_node->condition = &adapter->scan_wait_q_woken;
1846         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1847         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1848         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1849 }
1850
1851 /*
1852  * This function sends a scan command for all available channels to the
1853  * firmware, filtered on a specific SSID.
1854  */
1855 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1856                                       struct mwifiex_802_11_ssid *req_ssid)
1857 {
1858         struct mwifiex_adapter *adapter = priv->adapter;
1859         int ret = 0;
1860         struct mwifiex_user_scan_cfg *scan_cfg;
1861
1862         if (!req_ssid)
1863                 return -1;
1864
1865         if (adapter->scan_processing) {
1866                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1867                 return ret;
1868         }
1869
1870         if (priv->scan_block) {
1871                 dev_dbg(adapter->dev,
1872                         "cmd: Scan is blocked during association...\n");
1873                 return ret;
1874         }
1875
1876         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1877         if (!scan_cfg) {
1878                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1879                 return -ENOMEM;
1880         }
1881
1882         memcpy(scan_cfg->ssid_list[0].ssid, req_ssid->ssid,
1883                req_ssid->ssid_len);
1884
1885         ret = mwifiex_scan_networks(priv, scan_cfg);
1886
1887         kfree(scan_cfg);
1888         return ret;
1889 }
1890
1891 /*
1892  * Sends IOCTL request to start a scan.
1893  *
1894  * This function allocates the IOCTL request buffer, fills it
1895  * with requisite parameters and calls the IOCTL handler.
1896  *
1897  * Scan command can be issued for both normal scan and specific SSID
1898  * scan, depending upon whether an SSID is provided or not.
1899  */
1900 int mwifiex_request_scan(struct mwifiex_private *priv,
1901                          struct mwifiex_802_11_ssid *req_ssid)
1902 {
1903         int ret;
1904
1905         if (down_interruptible(&priv->async_sem)) {
1906                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1907                                                 __func__);
1908                 return -1;
1909         }
1910         priv->scan_pending_on_block = true;
1911
1912         priv->adapter->scan_wait_q_woken = false;
1913
1914         if (req_ssid && req_ssid->ssid_len != 0)
1915                 /* Specific SSID scan */
1916                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1917         else
1918                 /* Normal scan */
1919                 ret = mwifiex_scan_networks(priv, NULL);
1920
1921         if (!ret)
1922                 ret = mwifiex_wait_queue_complete(priv->adapter);
1923
1924         if (ret == -1) {
1925                 priv->scan_pending_on_block = false;
1926                 up(&priv->async_sem);
1927         }
1928
1929         return ret;
1930 }
1931
1932 /*
1933  * This function appends the vendor specific IE TLV to a buffer.
1934  */
1935 int
1936 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1937                             u16 vsie_mask, u8 **buffer)
1938 {
1939         int id, ret_len = 0;
1940         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1941
1942         if (!buffer)
1943                 return 0;
1944         if (!(*buffer))
1945                 return 0;
1946
1947         /*
1948          * Traverse through the saved vendor specific IE array and append
1949          * the selected(scan/assoc/adhoc) IE as TLV to the command
1950          */
1951         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1952                 if (priv->vs_ie[id].mask & vsie_mask) {
1953                         vs_param_set =
1954                                 (struct mwifiex_ie_types_vendor_param_set *)
1955                                 *buffer;
1956                         vs_param_set->header.type =
1957                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1958                         vs_param_set->header.len =
1959                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1960                                 & 0x00FF) + 2);
1961                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1962                                le16_to_cpu(vs_param_set->header.len));
1963                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1964                                    sizeof(struct mwifiex_ie_types_header);
1965                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1966                                    sizeof(struct mwifiex_ie_types_header);
1967                 }
1968         }
1969         return ret_len;
1970 }
1971
1972 /*
1973  * This function saves a beacon buffer of the current BSS descriptor.
1974  *
1975  * The current beacon buffer is saved so that it can be restored in the
1976  * following cases that makes the beacon buffer not to contain the current
1977  * ssid's beacon buffer.
1978  *      - The current ssid was not found somehow in the last scan.
1979  *      - The current ssid was the last entry of the scan table and overloaded.
1980  */
1981 void
1982 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1983 {
1984         struct mwifiex_bssdescriptor *curr_bss =
1985                 &priv->curr_bss_params.bss_descriptor;
1986
1987         if (!curr_bss->beacon_buf_size)
1988                 return;
1989
1990         /* allocate beacon buffer at 1st time; or if it's size has changed */
1991         if (!priv->curr_bcn_buf ||
1992                         priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1993                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1994
1995                 kfree(priv->curr_bcn_buf);
1996                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1997                                                 GFP_KERNEL);
1998                 if (!priv->curr_bcn_buf) {
1999                         dev_err(priv->adapter->dev,
2000                                         "failed to alloc curr_bcn_buf\n");
2001                         return;
2002                 }
2003         }
2004
2005         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2006                 curr_bss->beacon_buf_size);
2007         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2008                 priv->curr_bcn_size);
2009
2010         curr_bss->beacon_buf = priv->curr_bcn_buf;
2011
2012         /* adjust the pointers in the current BSS descriptor */
2013         if (curr_bss->bcn_wpa_ie)
2014                 curr_bss->bcn_wpa_ie =
2015                         (struct ieee_types_vendor_specific *)
2016                         (curr_bss->beacon_buf +
2017                          curr_bss->wpa_offset);
2018
2019         if (curr_bss->bcn_rsn_ie)
2020                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2021                         (curr_bss->beacon_buf +
2022                          curr_bss->rsn_offset);
2023
2024         if (curr_bss->bcn_ht_cap)
2025                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2026                         (curr_bss->beacon_buf +
2027                          curr_bss->ht_cap_offset);
2028
2029         if (curr_bss->bcn_ht_info)
2030                 curr_bss->bcn_ht_info = (struct ieee80211_ht_info *)
2031                         (curr_bss->beacon_buf +
2032                          curr_bss->ht_info_offset);
2033
2034         if (curr_bss->bcn_bss_co_2040)
2035                 curr_bss->bcn_bss_co_2040 =
2036                         (u8 *) (curr_bss->beacon_buf +
2037                                         curr_bss->bss_co_2040_offset);
2038
2039         if (curr_bss->bcn_ext_cap)
2040                 curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf +
2041                                 curr_bss->ext_cap_offset);
2042 }
2043
2044 /*
2045  * This function frees the current BSS descriptor beacon buffer.
2046  */
2047 void
2048 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2049 {
2050         kfree(priv->curr_bcn_buf);
2051         priv->curr_bcn_buf = NULL;
2052 }