drivers/net/wireless/mwifiex/scan.c

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