drivers/net/wireless/mwifiex/scan.c

   1 /*
   2  * Marvell Wireless LAN device driver: scan ioctl and command handling
   3  *
   4  * Copyright (C) 2011, Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available by writing to the Free Software Foundation, Inc.,
  11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13  *
  14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17  * this warranty disclaimer.
  18  */
  19
  20 #include "decl.h"
  21 #include "ioctl.h"
  22 #include "util.h"
  23 #include "fw.h"
  24 #include "main.h"
  25 #include "11n.h"
  26 #include "cfg80211.h"
  27
  28 /* The maximum number of channels the firmware can scan per command */
  29 #define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN   14
  30
  31 #define MWIFIEX_CHANNELS_PER_SCAN_CMD            4
  32
  33 /* Memory needed to store a max sized Channel List TLV for a firmware scan */
  34 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mwifiex_ie_types_header)         \
  35                                 + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN     \
  36                                 *sizeof(struct mwifiex_chan_scan_param_set)))
  37
  38 /* Memory needed to store supported rate */
  39 #define RATE_TLV_MAX_SIZE   (sizeof(struct mwifiex_ie_types_rates_param_set) \
  40                                 + HOSTCMD_SUPPORTED_RATES)
  41
  42 /* Memory needed to store a max number/size WildCard SSID TLV for a firmware
  43         scan */
  44 #define WILDCARD_SSID_TLV_MAX_SIZE  \
  45         (MWIFIEX_MAX_SSID_LIST_LENGTH *                                 \
  46                 (sizeof(struct mwifiex_ie_types_wildcard_ssid_params)   \
  47                         + IEEE80211_MAX_SSID_LEN))
  48
  49 /* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */
  50 #define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config)        \
  51                                 + sizeof(struct mwifiex_ie_types_num_probes)   \
  52                                 + sizeof(struct mwifiex_ie_types_htcap)       \
  53                                 + CHAN_TLV_MAX_SIZE                 \
  54                                 + RATE_TLV_MAX_SIZE                 \
  55                                 + WILDCARD_SSID_TLV_MAX_SIZE)
  56
  57
  58 union mwifiex_scan_cmd_config_tlv {
  59         /* Scan configuration (variable length) */
  60         struct mwifiex_scan_cmd_config config;
  61         /* Max allocated block */
  62         u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC];
  63 };
  64
  65 enum cipher_suite {
  66         CIPHER_SUITE_TKIP,
  67         CIPHER_SUITE_CCMP,
  68         CIPHER_SUITE_MAX
  69 };
  70 static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = {
  71         { 0x00, 0x50, 0xf2, 0x02 },     /* TKIP */
  72         { 0x00, 0x50, 0xf2, 0x04 },     /* AES  */
  73 };
  74 static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = {
  75         { 0x00, 0x0f, 0xac, 0x02 },     /* TKIP */
  76         { 0x00, 0x0f, 0xac, 0x04 },     /* AES  */
  77 };
  78
  79 /*
  80  * This function parses a given IE for a given OUI.
  81  *
  82  * This is used to parse a WPA/RSN IE to find if it has
  83  * a given oui in PTK.
  84  */
  85 static u8
  86 mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui)
  87 {
  88         u8 count;
  89
  90         count = iebody->ptk_cnt[0];
  91
  92         /* There could be multiple OUIs for PTK hence
  93            1) Take the length.
  94            2) Check all the OUIs for AES.
  95            3) If one of them is AES then pass success. */
  96         while (count) {
  97                 if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body)))
  98                         return MWIFIEX_OUI_PRESENT;
  99
 100                 --count;
 101                 if (count)
 102                         iebody = (struct ie_body *) ((u8 *) iebody +
 103                                                 sizeof(iebody->ptk_body));
 104         }
 105
 106         pr_debug("info: %s: OUI is not found in PTK\n", __func__);
 107         return MWIFIEX_OUI_NOT_PRESENT;
 108 }
 109
 110 /*
 111  * This function checks if a given OUI is present in a RSN IE.
 112  *
 113  * The function first checks if a RSN IE is present or not in the
 114  * BSS descriptor. It tries to locate the OUI only if such an IE is
 115  * present.
 116  */
 117 static u8
 118 mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 119 {
 120         u8 *oui;
 121         struct ie_body *iebody;
 122         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 123
 124         if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).
 125                                         ieee_hdr.element_id == WLAN_EID_RSN))) {
 126                 iebody = (struct ie_body *)
 127                          (((u8 *) bss_desc->bcn_rsn_ie->data) +
 128                          RSN_GTK_OUI_OFFSET);
 129                 oui = &mwifiex_rsn_oui[cipher][0];
 130                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 131                 if (ret)
 132                         return ret;
 133         }
 134         return ret;
 135 }
 136
 137 /*
 138  * This function checks if a given OUI is present in a WPA IE.
 139  *
 140  * The function first checks if a WPA IE is present or not in the
 141  * BSS descriptor. It tries to locate the OUI only if such an IE is
 142  * present.
 143  */
 144 static u8
 145 mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
 146 {
 147         u8 *oui;
 148         struct ie_body *iebody;
 149         u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 150
 151         if (((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)).
 152                                       vend_hdr.element_id == WLAN_EID_WPA))) {
 153                 iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
 154                 oui = &mwifiex_wpa_oui[cipher][0];
 155                 ret = mwifiex_search_oui_in_ie(iebody, oui);
 156                 if (ret)
 157                         return ret;
 158         }
 159         return ret;
 160 }
 161
 162 /*
 163  * This function compares two SSIDs and checks if they match.
 164  */
 165 s32
 166 mwifiex_ssid_cmp(struct mwifiex_802_11_ssid *ssid1,
 167                  struct mwifiex_802_11_ssid *ssid2)
 168 {
 169         if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
 170                 return -1;
 171         return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
 172 }
 173
 174 /*
 175  * Sends IOCTL request to start a scan with user configurations.
 176  *
 177  * This function allocates the IOCTL request buffer, fills it
 178  * with requisite parameters and calls the IOCTL handler.
 179  *
 180  * Upon completion, it also generates a wireless event to notify
 181  * applications.
 182  */
 183 int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv,
 184                                 struct mwifiex_user_scan_cfg *scan_req)
 185 {
 186         int status;
 187
 188         priv->adapter->scan_wait_q_woken = false;
 189
 190         status = mwifiex_scan_networks(priv, scan_req);
 191         if (!status)
 192                 status = mwifiex_wait_queue_complete(priv->adapter);
 193
 194         return status;
 195 }
 196
 197 /*
 198  * This function checks if wapi is enabled in driver and scanned network is
 199  * compatible with it.
 200  */
 201 static bool
 202 mwifiex_is_network_compatible_for_wapi(struct mwifiex_private *priv,
 203                                        struct mwifiex_bssdescriptor *bss_desc)
 204 {
 205         if (priv->sec_info.wapi_enabled &&
 206             (bss_desc->bcn_wapi_ie &&
 207              ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id ==
 208                         WLAN_EID_BSS_AC_ACCESS_DELAY))) {
 209                 return true;
 210         }
 211         return false;
 212 }
 213
 214 /*
 215  * This function checks if driver is configured with no security mode and
 216  * scanned network is compatible with it.
 217  */
 218 static bool
 219 mwifiex_is_network_compatible_for_no_sec(struct mwifiex_private *priv,
 220                                        struct mwifiex_bssdescriptor *bss_desc)
 221 {
 222         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 223             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 224             && ((!bss_desc->bcn_wpa_ie) ||
 225                 ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id !=
 226             WLAN_EID_WPA))
 227             && ((!bss_desc->bcn_rsn_ie) ||
 228                 ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id !=
 229             WLAN_EID_RSN))
 230             && !priv->sec_info.encryption_mode
 231             && !bss_desc->privacy) {
 232                 return true;
 233         }
 234         return false;
 235 }
 236
 237 /*
 238  * This function checks if static WEP is enabled in driver and scanned network
 239  * is compatible with it.
 240  */
 241 static bool
 242 mwifiex_is_network_compatible_for_static_wep(struct mwifiex_private *priv,
 243                                        struct mwifiex_bssdescriptor *bss_desc)
 244 {
 245         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_ENABLED
 246             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 247             && bss_desc->privacy) {
 248                 return true;
 249         }
 250         return false;
 251 }
 252
 253 /*
 254  * This function checks if wpa is enabled in driver and scanned network is
 255  * compatible with it.
 256  */
 257 static bool
 258 mwifiex_is_network_compatible_for_wpa(struct mwifiex_private *priv,
 259                                       struct mwifiex_bssdescriptor *bss_desc)
 260 {
 261         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 262             && priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 263             && ((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)).vend_hdr.
 264                                                 element_id == WLAN_EID_WPA))
 265            /*
 266             * Privacy bit may NOT be set in some APs like
 267             * LinkSys WRT54G && bss_desc->privacy
 268             */
 269          ) {
 270                 dev_dbg(priv->adapter->dev, "info: %s: WPA:"
 271                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 272                         "EncMode=%#x privacy=%#x\n", __func__,
 273                         (bss_desc->bcn_wpa_ie) ?
 274                         (*(bss_desc->bcn_wpa_ie)).
 275                         vend_hdr.element_id : 0,
 276                         (bss_desc->bcn_rsn_ie) ?
 277                         (*(bss_desc->bcn_rsn_ie)).
 278                         ieee_hdr.element_id : 0,
 279                         (priv->sec_info.wep_status ==
 280                         MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d",
 281                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 282                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 283                         priv->sec_info.encryption_mode,
 284                         bss_desc->privacy);
 285                 return true;
 286         }
 287         return false;
 288 }
 289
 290 /*
 291  * This function checks if wpa2 is enabled in driver and scanned network is
 292  * compatible with it.
 293  */
 294 static bool
 295 mwifiex_is_network_compatible_for_wpa2(struct mwifiex_private *priv,
 296                                        struct mwifiex_bssdescriptor *bss_desc)
 297 {
 298         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 299            && !priv->sec_info.wpa_enabled && priv->sec_info.wpa2_enabled
 300            && ((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 301                                                 element_id == WLAN_EID_RSN))
 302            /*
 303             * Privacy bit may NOT be set in some APs like
 304             * LinkSys WRT54G && bss_desc->privacy
 305             */
 306          ) {
 307                 dev_dbg(priv->adapter->dev, "info: %s: WPA2: "
 308                         " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
 309                         "EncMode=%#x privacy=%#x\n", __func__,
 310                         (bss_desc->bcn_wpa_ie) ?
 311                         (*(bss_desc->bcn_wpa_ie)).
 312                         vend_hdr.element_id : 0,
 313                         (bss_desc->bcn_rsn_ie) ?
 314                         (*(bss_desc->bcn_rsn_ie)).
 315                         ieee_hdr.element_id : 0,
 316                         (priv->sec_info.wep_status ==
 317                         MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d",
 318                         (priv->sec_info.wpa_enabled) ? "e" : "d",
 319                         (priv->sec_info.wpa2_enabled) ? "e" : "d",
 320                         priv->sec_info.encryption_mode,
 321                         bss_desc->privacy);
 322                 return true;
 323         }
 324         return false;
 325 }
 326
 327 /*
 328  * This function checks if adhoc AES is enabled in driver and scanned network is
 329  * compatible with it.
 330  */
 331 static bool
 332 mwifiex_is_network_compatible_for_adhoc_aes(struct mwifiex_private *priv,
 333                                        struct mwifiex_bssdescriptor *bss_desc)
 334 {
 335         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 336             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 337             && ((!bss_desc->bcn_wpa_ie) || ((*(bss_desc->bcn_wpa_ie)).vend_hdr.
 338                    element_id != WLAN_EID_WPA))
 339             && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 340                    element_id != WLAN_EID_RSN))
 341             && !priv->sec_info.encryption_mode
 342             && bss_desc->privacy) {
 343                 return true;
 344         }
 345         return false;
 346 }
 347
 348 /*
 349  * This function checks if dynamic WEP is enabled in driver and scanned network
 350  * is compatible with it.
 351  */
 352 static bool
 353 mwifiex_is_network_compatible_for_dynamic_wep(struct mwifiex_private *priv,
 354                                        struct mwifiex_bssdescriptor *bss_desc)
 355 {
 356         if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED
 357             && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled
 358             && ((!bss_desc->bcn_wpa_ie) || ((*(bss_desc->bcn_wpa_ie)).vend_hdr.
 359                    element_id != WLAN_EID_WPA))
 360             && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 361                    element_id != WLAN_EID_RSN))
 362             && priv->sec_info.encryption_mode
 363             && bss_desc->privacy) {
 364                 dev_dbg(priv->adapter->dev, "info: %s: dynamic "
 365                         "WEP: wpa_ie=%#x wpa2_ie=%#x "
 366                         "EncMode=%#x privacy=%#x\n",
 367                         __func__,
 368                         (bss_desc->bcn_wpa_ie) ?
 369                         (*(bss_desc->bcn_wpa_ie)).
 370                         vend_hdr.element_id : 0,
 371                         (bss_desc->bcn_rsn_ie) ?
 372                         (*(bss_desc->bcn_rsn_ie)).
 373                         ieee_hdr.element_id : 0,
 374                         priv->sec_info.encryption_mode,
 375                         bss_desc->privacy);
 376                 return true;
 377         }
 378         return false;
 379 }
 380
 381 /*
 382  * This function checks if a scanned network is compatible with the driver
 383  * settings.
 384  *
 385  *   WEP     WPA    WPA2   ad-hoc encrypt                  Network
 386  * enabled enabled enabled  AES    mode   Privacy WPA WPA2 Compatible
 387  *    0       0       0      0     NONE      0     0   0   yes No security
 388  *    0       1       0      0      x        1x    1   x   yes WPA (disable
 389  *                                                         HT if no AES)
 390  *    0       0       1      0      x        1x    x   1   yes WPA2 (disable
 391  *                                                         HT if no AES)
 392  *    0       0       0      1     NONE      1     0   0   yes Ad-hoc AES
 393  *    1       0       0      0     NONE      1     0   0   yes Static WEP
 394  *                                                         (disable HT)
 395  *    0       0       0      0    !=NONE     1     0   0   yes Dynamic WEP
 396  *
 397  * Compatibility is not matched while roaming, except for mode.
 398  */
 399 static s32
 400 mwifiex_is_network_compatible(struct mwifiex_private *priv,
 401                               struct mwifiex_bssdescriptor *bss_desc, u32 mode)
 402 {
 403         struct mwifiex_adapter *adapter = priv->adapter;
 404
 405         bss_desc->disable_11n = false;
 406
 407         /* Don't check for compatibility if roaming */
 408         if (priv->media_connected && (priv->bss_mode == NL80211_IFTYPE_STATION)
 409             && (bss_desc->bss_mode == NL80211_IFTYPE_STATION))
 410                 return 0;
 411
 412         if (priv->wps.session_enable) {
 413                 dev_dbg(adapter->dev,
 414                         "info: return success directly in WPS period\n");
 415                 return 0;
 416         }
 417
 418         if (mwifiex_is_network_compatible_for_wapi(priv, bss_desc)) {
 419                 dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
 420                 return 0;
 421         }
 422
 423         if (bss_desc->bss_mode == mode) {
 424                 if (mwifiex_is_network_compatible_for_no_sec(priv, bss_desc)) {
 425                         /* No security */
 426                         return 0;
 427                 } else if (mwifiex_is_network_compatible_for_static_wep(priv,
 428                                                                 bss_desc)) {
 429                         /* Static WEP enabled */
 430                         dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n");
 431                         bss_desc->disable_11n = true;
 432                         return 0;
 433                 } else if (mwifiex_is_network_compatible_for_wpa(priv,
 434                                                                  bss_desc)) {
 435                         /* WPA enabled */
 436                         if (((priv->adapter->config_bands & BAND_GN
 437                               || priv->adapter->config_bands & BAND_AN)
 438                               && bss_desc->bcn_ht_cap)
 439                               && !mwifiex_is_wpa_oui_present(bss_desc,
 440                                         CIPHER_SUITE_CCMP)) {
 441
 442                                 if (mwifiex_is_wpa_oui_present(bss_desc,
 443                                             CIPHER_SUITE_TKIP)) {
 444                                         dev_dbg(adapter->dev,
 445                                                 "info: Disable 11n if AES "
 446                                                 "is not supported by AP\n");
 447                                         bss_desc->disable_11n = true;
 448                                 } else {
 449                                         return -1;
 450                                 }
 451                         }
 452                         return 0;
 453                 } else if (mwifiex_is_network_compatible_for_wpa2(priv,
 454                                                         bss_desc)) {
 455                         /* WPA2 enabled */
 456                         if (((priv->adapter->config_bands & BAND_GN
 457                               || priv->adapter->config_bands & BAND_AN)
 458                               && bss_desc->bcn_ht_cap)
 459                               && !mwifiex_is_rsn_oui_present(bss_desc,
 460                                         CIPHER_SUITE_CCMP)) {
 461
 462                                 if (mwifiex_is_rsn_oui_present(bss_desc,
 463                                             CIPHER_SUITE_TKIP)) {
 464                                         dev_dbg(adapter->dev,
 465                                                 "info: Disable 11n if AES "
 466                                                 "is not supported by AP\n");
 467                                         bss_desc->disable_11n = true;
 468                                 } else {
 469                                         return -1;
 470                                 }
 471                         }
 472                         return 0;
 473                 } else if (mwifiex_is_network_compatible_for_adhoc_aes(priv,
 474                                                                 bss_desc)) {
 475                         /* Ad-hoc AES enabled */
 476                         return 0;
 477                 } else if (mwifiex_is_network_compatible_for_dynamic_wep(priv,
 478                                                         bss_desc)) {
 479                         /* Dynamic WEP enabled */
 480                         return 0;
 481                 }
 482
 483                 /* Security doesn't match */
 484                 dev_dbg(adapter->dev, "info: %s: failed: "
 485                        "wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s EncMode"
 486                        "=%#x privacy=%#x\n",
 487                        __func__,
 488                        (bss_desc->bcn_wpa_ie) ?
 489                        (*(bss_desc->bcn_wpa_ie)).vend_hdr.
 490                        element_id : 0,
 491                        (bss_desc->bcn_rsn_ie) ?
 492                        (*(bss_desc->bcn_rsn_ie)).ieee_hdr.
 493                        element_id : 0,
 494                        (priv->sec_info.wep_status ==
 495                                 MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d",
 496                        (priv->sec_info.wpa_enabled) ? "e" : "d",
 497                        (priv->sec_info.wpa2_enabled) ? "e" : "d",
 498                        priv->sec_info.encryption_mode, bss_desc->privacy);
 499                 return -1;
 500         }
 501
 502         /* Mode doesn't match */
 503         return -1;
 504 }
 505
 506 /*
 507  * This function creates a channel list for the driver to scan, based
 508  * on region/band information.
 509  *
 510  * This routine is used for any scan that is not provided with a
 511  * specific channel list to scan.
 512  */
 513 static void
 514 mwifiex_scan_create_channel_list(struct mwifiex_private *priv,
 515                                 const struct mwifiex_user_scan_cfg
 516                                 *user_scan_in,
 517                                 struct mwifiex_chan_scan_param_set
 518                                 *scan_chan_list,
 519                                 u8 filtered_scan)
 520 {
 521         enum ieee80211_band band;
 522         struct ieee80211_supported_band *sband;
 523         struct ieee80211_channel *ch;
 524         struct mwifiex_adapter *adapter = priv->adapter;
 525         int chan_idx = 0, i;
 526         u8 scan_type;
 527
 528         for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) {
 529
 530                 if (!priv->wdev->wiphy->bands[band])
 531                         continue;
 532
 533                 sband = priv->wdev->wiphy->bands[band];
 534
 535                 for (i = 0; (i < sband->n_channels) ; i++) {
 536                         ch = &sband->channels[i];
 537                         if (ch->flags & IEEE80211_CHAN_DISABLED)
 538                                 continue;
 539                         scan_chan_list[chan_idx].radio_type = band;
 540                         scan_type = ch->flags & IEEE80211_CHAN_PASSIVE_SCAN;
 541                         if (user_scan_in &&
 542                                 user_scan_in->chan_list[0].scan_time)
 543                                 scan_chan_list[chan_idx].max_scan_time =
 544                                         cpu_to_le16((u16) user_scan_in->
 545                                         chan_list[0].scan_time);
 546                         else if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 547                                 scan_chan_list[chan_idx].max_scan_time =
 548                                         cpu_to_le16(adapter->passive_scan_time);
 549                         else
 550                                 scan_chan_list[chan_idx].max_scan_time =
 551                                         cpu_to_le16(adapter->active_scan_time);
 552                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 553                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 554                                         |= MWIFIEX_PASSIVE_SCAN;
 555                         else
 556                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 557                                         &= ~MWIFIEX_PASSIVE_SCAN;
 558                         scan_chan_list[chan_idx].chan_number =
 559                                                         (u32) ch->hw_value;
 560                         if (filtered_scan) {
 561                                 scan_chan_list[chan_idx].max_scan_time =
 562                                 cpu_to_le16(adapter->specific_scan_time);
 563                                 scan_chan_list[chan_idx].chan_scan_mode_bitmap
 564                                         |= MWIFIEX_DISABLE_CHAN_FILT;
 565                         }
 566                         chan_idx++;
 567                 }
 568
 569         }
 570 }
 571
 572 /*
 573  * This function constructs and sends multiple scan config commands to
 574  * the firmware.
 575  *
 576  * Previous routines in the code flow have created a scan command configuration
 577  * with any requested TLVs.  This function splits the channel TLV into maximum
 578  * channels supported per scan lists and sends the portion of the channel TLV,
 579  * along with the other TLVs, to the firmware.
 580  */
 581 static int
 582 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 583                           u32 max_chan_per_scan, u8 filtered_scan,
 584                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 585                           struct mwifiex_ie_types_chan_list_param_set
 586                           *chan_tlv_out,
 587                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 588 {
 589         int ret = 0;
 590         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 591         struct mwifiex_chan_scan_param_set *start_chan;
 592
 593         u32 tlv_idx;
 594         u32 total_scan_time;
 595         u32 done_early;
 596
 597         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 598                 dev_dbg(priv->adapter->dev,
 599                         "info: Scan: Null detect: %p, %p, %p\n",
 600                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 601                 return -1;
 602         }
 603
 604         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 605
 606         /* Set the temp channel struct pointer to the start of the desired
 607            list */
 608         tmp_chan_list = scan_chan_list;
 609
 610         /* Loop through the desired channel list, sending a new firmware scan
 611            commands for each max_chan_per_scan channels (or for 1,6,11
 612            individually if configured accordingly) */
 613         while (tmp_chan_list->chan_number) {
 614
 615                 tlv_idx = 0;
 616                 total_scan_time = 0;
 617                 chan_tlv_out->header.len = 0;
 618                 start_chan = tmp_chan_list;
 619                 done_early = false;
 620
 621                 /*
 622                  * Construct the Channel TLV for the scan command.  Continue to
 623                  * insert channel TLVs until:
 624                  *   - the tlv_idx hits the maximum configured per scan command
 625                  *   - the next channel to insert is 0 (end of desired channel
 626                  *     list)
 627                  *   - done_early is set (controlling individual scanning of
 628                  *     1,6,11)
 629                  */
 630                 while (tlv_idx < max_chan_per_scan
 631                        && tmp_chan_list->chan_number && !done_early) {
 632
 633                         dev_dbg(priv->adapter->dev,
 634                                 "info: Scan: Chan(%3d), Radio(%d),"
 635                                 " Mode(%d, %d), Dur(%d)\n",
 636                                tmp_chan_list->chan_number,
 637                                tmp_chan_list->radio_type,
 638                                tmp_chan_list->chan_scan_mode_bitmap
 639                                & MWIFIEX_PASSIVE_SCAN,
 640                                (tmp_chan_list->chan_scan_mode_bitmap
 641                                & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 642                                le16_to_cpu(tmp_chan_list->max_scan_time));
 643
 644                         /* Copy the current channel TLV to the command being
 645                            prepared */
 646                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 647                                tmp_chan_list,
 648                                sizeof(chan_tlv_out->chan_scan_param));
 649
 650                         /* Increment the TLV header length by the size
 651                            appended */
 652                         chan_tlv_out->header.len =
 653                         cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
 654                         (sizeof(chan_tlv_out->chan_scan_param)));
 655
 656                         /*
 657                          * The tlv buffer length is set to the number of bytes
 658                          * of the between the channel tlv pointer and the start
 659                          * of the tlv buffer.  This compensates for any TLVs
 660                          * that were appended before the channel list.
 661                          */
 662                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 663                                                         scan_cfg_out->tlv_buf);
 664
 665                         /* Add the size of the channel tlv header and the data
 666                            length */
 667                         scan_cfg_out->tlv_buf_len +=
 668                                 (sizeof(chan_tlv_out->header)
 669                                  + le16_to_cpu(chan_tlv_out->header.len));
 670
 671                         /* Increment the index to the channel tlv we are
 672                            constructing */
 673                         tlv_idx++;
 674
 675                         /* Count the total scan time per command */
 676                         total_scan_time +=
 677                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 678
 679                         done_early = false;
 680
 681                         /* Stop the loop if the *current* channel is in the
 682                            1,6,11 set and we are not filtering on a BSSID
 683                            or SSID. */
 684                         if (!filtered_scan && (tmp_chan_list->chan_number == 1
 685                                 || tmp_chan_list->chan_number == 6
 686                                 || tmp_chan_list->chan_number == 11))
 687                                 done_early = true;
 688
 689                         /* Increment the tmp pointer to the next channel to
 690                            be scanned */
 691                         tmp_chan_list++;
 692
 693                         /* Stop the loop if the *next* channel is in the 1,6,11
 694                            set.  This will cause it to be the only channel
 695                            scanned on the next interation */
 696                         if (!filtered_scan && (tmp_chan_list->chan_number == 1
 697                                 || tmp_chan_list->chan_number == 6
 698                                 || tmp_chan_list->chan_number == 11))
 699                                 done_early = true;
 700                 }
 701
 702                 /* The total scan time should be less than scan command timeout
 703                    value */
 704                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 705                         dev_err(priv->adapter->dev, "total scan time %dms"
 706                                 " is over limit (%dms), scan skipped\n",
 707                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 708                         ret = -1;
 709                         break;
 710                 }
 711
 712                 priv->adapter->scan_channels = start_chan;
 713
 714                 /* Send the scan command to the firmware with the specified
 715                    cfg */
 716                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 717                                              HostCmd_ACT_GEN_SET, 0,
 718                                              scan_cfg_out);
 719                 if (ret)
 720                         break;
 721         }
 722
 723         if (ret)
 724                 return -1;
 725
 726         return 0;
 727 }
 728
 729 /*
 730  * This function constructs a scan command configuration structure to use
 731  * in scan commands.
 732  *
 733  * Application layer or other functions can invoke network scanning
 734  * with a scan configuration supplied in a user scan configuration structure.
 735  * This structure is used as the basis of one or many scan command configuration
 736  * commands that are sent to the command processing module and eventually to the
 737  * firmware.
 738  *
 739  * This function creates a scan command configuration structure  based on the
 740  * following user supplied parameters (if present):
 741  *      - SSID filter
 742  *      - BSSID filter
 743  *      - Number of Probes to be sent
 744  *      - Channel list
 745  *
 746  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 747  * If the number of probes is not set, adapter default setting is used.
 748  */
 749 static void
 750 mwifiex_scan_setup_scan_config(struct mwifiex_private *priv,
 751                                const struct mwifiex_user_scan_cfg *user_scan_in,
 752                                struct mwifiex_scan_cmd_config *scan_cfg_out,
 753                                struct mwifiex_ie_types_chan_list_param_set
 754                                **chan_list_out,
 755                                struct mwifiex_chan_scan_param_set
 756                                *scan_chan_list,
 757                                u8 *max_chan_per_scan, u8 *filtered_scan,
 758                                u8 *scan_current_only)
 759 {
 760         struct mwifiex_adapter *adapter = priv->adapter;
 761         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 762         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 763         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 764         const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
 765         u8 *tlv_pos;
 766         u32 num_probes;
 767         u32 ssid_len;
 768         u32 chan_idx;
 769         u32 scan_type;
 770         u16 scan_dur;
 771         u8 channel;
 772         u8 radio_type;
 773         u32 ssid_idx;
 774         u8 ssid_filter;
 775         u8 rates[MWIFIEX_SUPPORTED_RATES];
 776         u32 rates_size;
 777         struct mwifiex_ie_types_htcap *ht_cap;
 778
 779         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 780            in this routine will be preserved since the routine that sends the
 781            command will append channelTLVs at *chan_list_out.  The difference
 782            between the *chan_list_out and the tlv_buf start will be used to
 783            calculate the size of anything we add in this routine. */
 784         scan_cfg_out->tlv_buf_len = 0;
 785
 786         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 787            so later routines know where channels can be added to the command
 788            buf */
 789         tlv_pos = scan_cfg_out->tlv_buf;
 790
 791         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 792            below if a SSID or BSSID filter is sent in the command */
 793         *filtered_scan = false;
 794
 795         /* Initialize the scan as not being only on the current channel.  If
 796            the channel list is customized, only contains one channel, and is
 797            the active channel, this is set true and data flow is not halted. */
 798         *scan_current_only = false;
 799
 800         if (user_scan_in) {
 801
 802                 /* Default the ssid_filter flag to TRUE, set false under
 803                    certain wildcard conditions and qualified by the existence
 804                    of an SSID list before marking the scan as filtered */
 805                 ssid_filter = true;
 806
 807                 /* Set the BSS type scan filter, use Adapter setting if
 808                    unset */
 809                 scan_cfg_out->bss_mode =
 810                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 811                          bss_mode : (u8) adapter->scan_mode);
 812
 813                 /* Set the number of probes to send, use Adapter setting
 814                    if unset */
 815                 num_probes =
 816                         (user_scan_in->num_probes ? user_scan_in->
 817                          num_probes : adapter->scan_probes);
 818
 819                 /*
 820                  * Set the BSSID filter to the incoming configuration,
 821                  * if non-zero.  If not set, it will remain disabled
 822                  * (all zeros).
 823                  */
 824                 memcpy(scan_cfg_out->specific_bssid,
 825                        user_scan_in->specific_bssid,
 826                        sizeof(scan_cfg_out->specific_bssid));
 827
 828                 for (ssid_idx = 0;
 829                      ((ssid_idx < ARRAY_SIZE(user_scan_in->ssid_list))
 830                       && (*user_scan_in->ssid_list[ssid_idx].ssid
 831                           || user_scan_in->ssid_list[ssid_idx].max_len));
 832                      ssid_idx++) {
 833
 834                         ssid_len = strlen(user_scan_in->ssid_list[ssid_idx].
 835                                           ssid) + 1;
 836
 837                         wildcard_ssid_tlv =
 838                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 839                                 tlv_pos;
 840                         wildcard_ssid_tlv->header.type =
 841                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 842                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 843                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 844                                                          max_ssid_length)));
 845                         wildcard_ssid_tlv->max_ssid_length =
 846                                 user_scan_in->ssid_list[ssid_idx].max_len;
 847
 848                         memcpy(wildcard_ssid_tlv->ssid,
 849                                user_scan_in->ssid_list[ssid_idx].ssid,
 850                                ssid_len);
 851
 852                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 853                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 854
 855                         dev_dbg(adapter->dev, "info: scan: ssid_list[%d]: %s, %d\n",
 856                                 ssid_idx, wildcard_ssid_tlv->ssid,
 857                                 wildcard_ssid_tlv->max_ssid_length);
 858
 859                         /* Empty wildcard ssid with a maxlen will match many or
 860                            potentially all SSIDs (maxlen == 32), therefore do
 861                            not treat the scan as
 862                            filtered. */
 863                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 864                                 ssid_filter = false;
 865
 866                 }
 867
 868                 /*
 869                  *  The default number of channels sent in the command is low to
 870                  *  ensure the response buffer from the firmware does not
 871                  *  truncate scan results.  That is not an issue with an SSID
 872                  *  or BSSID filter applied to the scan results in the firmware.
 873                  */
 874                 if ((ssid_idx && ssid_filter)
 875                     || memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 876                               sizeof(zero_mac)))
 877                         *filtered_scan = true;
 878         } else {
 879                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 880                 num_probes = adapter->scan_probes;
 881         }
 882
 883         /*
 884          *  If a specific BSSID or SSID is used, the number of channels in the
 885          *  scan command will be increased to the absolute maximum.
 886          */
 887         if (*filtered_scan)
 888                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 889         else
 890                 *max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD;
 891
 892         /* If the input config or adapter has the number of Probes set,
 893            add tlv */
 894         if (num_probes) {
 895
 896                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 897                                                 num_probes);
 898
 899                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 900                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 901                 num_probes_tlv->header.len =
 902                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 903                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 904
 905                 tlv_pos += sizeof(num_probes_tlv->header) +
 906                         le16_to_cpu(num_probes_tlv->header.len);
 907
 908         }
 909
 910         /* Append rates tlv */
 911         memset(rates, 0, sizeof(rates));
 912
 913         rates_size = mwifiex_get_supported_rates(priv, rates);
 914
 915         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 916         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 917         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 918         memcpy(rates_tlv->rates, rates, rates_size);
 919         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 920
 921         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 922
 923         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info)
 924             && (priv->adapter->config_bands & BAND_GN
 925                 || priv->adapter->config_bands & BAND_AN)) {
 926                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 927                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 928                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 929                 ht_cap->header.len =
 930                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 931                 radio_type =
 932                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 933                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 934                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 935         }
 936
 937         /* Append vendor specific IE TLV */
 938         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 939
 940         /*
 941          * Set the output for the channel TLV to the address in the tlv buffer
 942          *   past any TLVs that were added in this function (SSID, num_probes).
 943          *   Channel TLVs will be added past this for each scan command,
 944          *   preserving the TLVs that were previously added.
 945          */
 946         *chan_list_out =
 947                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 948
 949         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 950
 951                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 952
 953                 for (chan_idx = 0;
 954                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX
 955                      && user_scan_in->chan_list[chan_idx].chan_number;
 956                      chan_idx++) {
 957
 958                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 959                         (scan_chan_list + chan_idx)->chan_number = channel;
 960
 961                         radio_type =
 962                                 user_scan_in->chan_list[chan_idx].radio_type;
 963                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 964
 965                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 966
 967                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 968                                 (scan_chan_list +
 969                                  chan_idx)->chan_scan_mode_bitmap
 970                                         |= MWIFIEX_PASSIVE_SCAN;
 971                         else
 972                                 (scan_chan_list +
 973                                  chan_idx)->chan_scan_mode_bitmap
 974                                         &= ~MWIFIEX_PASSIVE_SCAN;
 975
 976                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 977                                 scan_dur = (u16) user_scan_in->
 978                                         chan_list[chan_idx].scan_time;
 979                         } else {
 980                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 981                                         scan_dur = adapter->passive_scan_time;
 982                                 else if (*filtered_scan)
 983                                         scan_dur = adapter->specific_scan_time;
 984                                 else
 985                                         scan_dur = adapter->active_scan_time;
 986                         }
 987
 988                         (scan_chan_list + chan_idx)->min_scan_time =
 989                                 cpu_to_le16(scan_dur);
 990                         (scan_chan_list + chan_idx)->max_scan_time =
 991                                 cpu_to_le16(scan_dur);
 992                 }
 993
 994                 /* Check if we are only scanning the current channel */
 995                 if ((chan_idx == 1)
 996                     && (user_scan_in->chan_list[0].chan_number
 997                         == priv->curr_bss_params.bss_descriptor.channel)) {
 998                         *scan_current_only = true;
 999                         dev_dbg(adapter->dev,
1000                                 "info: Scan: Scanning current channel only\n");
1001                 }
1002
1003         } else {
1004                 dev_dbg(adapter->dev,
1005                                 "info: Scan: Creating full region channel list\n");
1006                 mwifiex_scan_create_channel_list(priv, user_scan_in,
1007                                                  scan_chan_list,
1008                                                  *filtered_scan);
1009         }
1010 }
1011
1012 /*
1013  * This function inspects the scan response buffer for pointers to
1014  * expected TLVs.
1015  *
1016  * TLVs can be included at the end of the scan response BSS information.
1017  *
1018  * Data in the buffer is parsed pointers to TLVs that can potentially
1019  * be passed back in the response.
1020  */
1021 static void
1022 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1023                                      struct mwifiex_ie_types_data *tlv,
1024                                      u32 tlv_buf_size, u32 req_tlv_type,
1025                                      struct mwifiex_ie_types_data **tlv_data)
1026 {
1027         struct mwifiex_ie_types_data *current_tlv;
1028         u32 tlv_buf_left;
1029         u32 tlv_type;
1030         u32 tlv_len;
1031
1032         current_tlv = tlv;
1033         tlv_buf_left = tlv_buf_size;
1034         *tlv_data = NULL;
1035
1036         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1037                                                 tlv_buf_size);
1038
1039         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1040
1041                 tlv_type = le16_to_cpu(current_tlv->header.type);
1042                 tlv_len = le16_to_cpu(current_tlv->header.len);
1043
1044                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1045                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1046                         break;
1047                 }
1048
1049                 if (req_tlv_type == tlv_type) {
1050                         switch (tlv_type) {
1051                         case TLV_TYPE_TSFTIMESTAMP:
1052                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1053                                         "timestamp TLV, len = %d\n", tlv_len);
1054                                 *tlv_data = (struct mwifiex_ie_types_data *)
1055                                         current_tlv;
1056                                 break;
1057                         case TLV_TYPE_CHANNELBANDLIST:
1058                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1059                                         " band list TLV, len = %d\n", tlv_len);
1060                                 *tlv_data = (struct mwifiex_ie_types_data *)
1061                                         current_tlv;
1062                                 break;
1063                         default:
1064                                 dev_err(adapter->dev,
1065                                         "SCAN_RESP: unhandled TLV = %d\n",
1066                                        tlv_type);
1067                                 /* Give up, this seems corrupted */
1068                                 return;
1069                         }
1070                 }
1071
1072                 if (*tlv_data)
1073                         break;
1074
1075
1076                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1077                 current_tlv =
1078                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1079                                                           tlv_len);
1080
1081         }                       /* while */
1082 }
1083
1084 /*
1085  * This function parses provided beacon buffer and updates
1086  * respective fields in bss descriptor structure.
1087  */
1088 int
1089 mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1090                                 struct mwifiex_bssdescriptor *bss_entry,
1091                                 u8 *ie_buf, u32 ie_len)
1092 {
1093         int ret = 0;
1094         u8 element_id;
1095         struct ieee_types_fh_param_set *fh_param_set;
1096         struct ieee_types_ds_param_set *ds_param_set;
1097         struct ieee_types_cf_param_set *cf_param_set;
1098         struct ieee_types_ibss_param_set *ibss_param_set;
1099         u8 *current_ptr;
1100         u8 *rate;
1101         u8 element_len;
1102         u16 total_ie_len;
1103         u8 bytes_to_copy;
1104         u8 rate_size;
1105         u8 found_data_rate_ie;
1106         u32 bytes_left;
1107         struct ieee_types_vendor_specific *vendor_ie;
1108         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1109         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1110
1111         found_data_rate_ie = false;
1112         rate_size = 0;
1113         current_ptr = ie_buf;
1114         bytes_left = ie_len;
1115         bss_entry->beacon_buf = ie_buf;
1116         bss_entry->beacon_buf_size = ie_len;
1117
1118         /* Process variable IE */
1119         while (bytes_left >= 2) {
1120                 element_id = *current_ptr;
1121                 element_len = *(current_ptr + 1);
1122                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1123
1124                 if (bytes_left < total_ie_len) {
1125                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1126                                 " IE, bytes left < IE length\n");
1127                         return -1;
1128                 }
1129                 switch (element_id) {
1130                 case WLAN_EID_SSID:
1131                         bss_entry->ssid.ssid_len = element_len;
1132                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1133                                element_len);
1134                         dev_dbg(adapter->dev, "info: InterpretIE: ssid: "
1135                                               "%-32s\n", bss_entry->ssid.ssid);
1136                         break;
1137
1138                 case WLAN_EID_SUPP_RATES:
1139                         memcpy(bss_entry->data_rates, current_ptr + 2,
1140                                element_len);
1141                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1142                                element_len);
1143                         rate_size = element_len;
1144                         found_data_rate_ie = true;
1145                         break;
1146
1147                 case WLAN_EID_FH_PARAMS:
1148                         fh_param_set =
1149                                 (struct ieee_types_fh_param_set *) current_ptr;
1150                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1151                                fh_param_set,
1152                                sizeof(struct ieee_types_fh_param_set));
1153                         break;
1154
1155                 case WLAN_EID_DS_PARAMS:
1156                         ds_param_set =
1157                                 (struct ieee_types_ds_param_set *) current_ptr;
1158
1159                         bss_entry->channel = ds_param_set->current_chan;
1160
1161                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1162                                ds_param_set,
1163                                sizeof(struct ieee_types_ds_param_set));
1164                         break;
1165
1166                 case WLAN_EID_CF_PARAMS:
1167                         cf_param_set =
1168                                 (struct ieee_types_cf_param_set *) current_ptr;
1169                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1170                                cf_param_set,
1171                                sizeof(struct ieee_types_cf_param_set));
1172                         break;
1173
1174                 case WLAN_EID_IBSS_PARAMS:
1175                         ibss_param_set =
1176                                 (struct ieee_types_ibss_param_set *)
1177                                 current_ptr;
1178                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1179                                ibss_param_set,
1180                                sizeof(struct ieee_types_ibss_param_set));
1181                         break;
1182
1183                 case WLAN_EID_ERP_INFO:
1184                         bss_entry->erp_flags = *(current_ptr + 2);
1185                         break;
1186
1187                 case WLAN_EID_EXT_SUPP_RATES:
1188                         /*
1189                          * Only process extended supported rate
1190                          * if data rate is already found.
1191                          * Data rate IE should come before
1192                          * extended supported rate IE
1193                          */
1194                         if (found_data_rate_ie) {
1195                                 if ((element_len + rate_size) >
1196                                     MWIFIEX_SUPPORTED_RATES)
1197                                         bytes_to_copy =
1198                                                 (MWIFIEX_SUPPORTED_RATES -
1199                                                  rate_size);
1200                                 else
1201                                         bytes_to_copy = element_len;
1202
1203                                 rate = (u8 *) bss_entry->data_rates;
1204                                 rate += rate_size;
1205                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1206
1207                                 rate = (u8 *) bss_entry->supported_rates;
1208                                 rate += rate_size;
1209                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1210                         }
1211                         break;
1212
1213                 case WLAN_EID_VENDOR_SPECIFIC:
1214                         vendor_ie = (struct ieee_types_vendor_specific *)
1215                                         current_ptr;
1216
1217                         if (!memcmp
1218                             (vendor_ie->vend_hdr.oui, wpa_oui,
1219                              sizeof(wpa_oui))) {
1220                                 bss_entry->bcn_wpa_ie =
1221                                         (struct ieee_types_vendor_specific *)
1222                                         current_ptr;
1223                                 bss_entry->wpa_offset = (u16) (current_ptr -
1224                                                         bss_entry->beacon_buf);
1225                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1226                                     sizeof(wmm_oui))) {
1227                                 if (total_ie_len ==
1228                                     sizeof(struct ieee_types_wmm_parameter)
1229                                     || total_ie_len ==
1230                                     sizeof(struct ieee_types_wmm_info))
1231                                         /*
1232                                          * Only accept and copy the WMM IE if
1233                                          * it matches the size expected for the
1234                                          * WMM Info IE or the WMM Parameter IE.
1235                                          */
1236                                         memcpy((u8 *) &bss_entry->wmm_ie,
1237                                                current_ptr, total_ie_len);
1238                         }
1239                         break;
1240                 case WLAN_EID_RSN:
1241                         bss_entry->bcn_rsn_ie =
1242                                 (struct ieee_types_generic *) current_ptr;
1243                         bss_entry->rsn_offset = (u16) (current_ptr -
1244                                                         bss_entry->beacon_buf);
1245                         break;
1246                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1247                         bss_entry->bcn_wapi_ie =
1248                                 (struct ieee_types_generic *) current_ptr;
1249                         bss_entry->wapi_offset = (u16) (current_ptr -
1250                                                         bss_entry->beacon_buf);
1251                         break;
1252                 case WLAN_EID_HT_CAPABILITY:
1253                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1254                                         (current_ptr +
1255                                         sizeof(struct ieee_types_header));
1256                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1257                                         sizeof(struct ieee_types_header) -
1258                                         bss_entry->beacon_buf);
1259                         break;
1260                 case WLAN_EID_HT_INFORMATION:
1261                         bss_entry->bcn_ht_info = (struct ieee80211_ht_info *)
1262                                         (current_ptr +
1263                                         sizeof(struct ieee_types_header));
1264                         bss_entry->ht_info_offset = (u16) (current_ptr +
1265                                         sizeof(struct ieee_types_header) -
1266                                         bss_entry->beacon_buf);
1267                         break;
1268                 case WLAN_EID_BSS_COEX_2040:
1269                         bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
1270                                         sizeof(struct ieee_types_header));
1271                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1272                                         sizeof(struct ieee_types_header) -
1273                                                 bss_entry->beacon_buf);
1274                         break;
1275                 case WLAN_EID_EXT_CAPABILITY:
1276                         bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
1277                                         sizeof(struct ieee_types_header));
1278                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1279                                         sizeof(struct ieee_types_header) -
1280                                         bss_entry->beacon_buf);
1281                         break;
1282                 default:
1283                         break;
1284                 }
1285
1286                 current_ptr += element_len + 2;
1287
1288                 /* Need to account for IE ID and IE Len */
1289                 bytes_left -= (element_len + 2);
1290
1291         }       /* while (bytes_left > 2) */
1292         return ret;
1293 }
1294
1295 /*
1296  * This function converts radio type scan parameter to a band configuration
1297  * to be used in join command.
1298  */
1299 static u8
1300 mwifiex_radio_type_to_band(u8 radio_type)
1301 {
1302         switch (radio_type) {
1303         case HostCmd_SCAN_RADIO_TYPE_A:
1304                 return BAND_A;
1305         case HostCmd_SCAN_RADIO_TYPE_BG:
1306         default:
1307                 return BAND_G;
1308         }
1309 }
1310
1311 /*
1312  * This is an internal function used to start a scan based on an input
1313  * configuration.
1314  *
1315  * This uses the input user scan configuration information when provided in
1316  * order to send the appropriate scan commands to firmware to populate or
1317  * update the internal driver scan table.
1318  */
1319 int mwifiex_scan_networks(struct mwifiex_private *priv,
1320                           const struct mwifiex_user_scan_cfg *user_scan_in)
1321 {
1322         int ret = 0;
1323         struct mwifiex_adapter *adapter = priv->adapter;
1324         struct cmd_ctrl_node *cmd_node;
1325         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1326         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1327         u32 buf_size;
1328         struct mwifiex_chan_scan_param_set *scan_chan_list;
1329         u8 filtered_scan;
1330         u8 scan_current_chan_only;
1331         u8 max_chan_per_scan;
1332         unsigned long flags;
1333
1334         if (adapter->scan_processing) {
1335                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1336                 return ret;
1337         }
1338
1339         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1340         adapter->scan_processing = true;
1341         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1342
1343         if (priv->scan_block) {
1344                 dev_dbg(adapter->dev,
1345                         "cmd: Scan is blocked during association...\n");
1346                 return ret;
1347         }
1348
1349         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1350                                         GFP_KERNEL);
1351         if (!scan_cfg_out) {
1352                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1353                 return -ENOMEM;
1354         }
1355
1356         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1357                         MWIFIEX_USER_SCAN_CHAN_MAX;
1358         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1359         if (!scan_chan_list) {
1360                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1361                 kfree(scan_cfg_out);
1362                 return -ENOMEM;
1363         }
1364
1365         mwifiex_scan_setup_scan_config(priv, user_scan_in,
1366                                        &scan_cfg_out->config, &chan_list_out,
1367                                        scan_chan_list, &max_chan_per_scan,
1368                                        &filtered_scan, &scan_current_chan_only);
1369
1370         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1371                                         &scan_cfg_out->config, chan_list_out,
1372                                         scan_chan_list);
1373
1374         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1375         if (!ret) {
1376                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1377                 if (!list_empty(&adapter->scan_pending_q)) {
1378                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1379                                                 struct cmd_ctrl_node, list);
1380                         list_del(&cmd_node->list);
1381                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1382                                                                         flags);
1383                         adapter->cmd_queued = cmd_node;
1384                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1385                                                         true);
1386                 } else {
1387                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1388                                                flags);
1389                 }
1390         } else {
1391                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1392                 adapter->scan_processing = true;
1393                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1394         }
1395
1396         kfree(scan_cfg_out);
1397         kfree(scan_chan_list);
1398         return ret;
1399 }
1400
1401 /*
1402  * This function prepares a scan command to be sent to the firmware.
1403  *
1404  * This uses the scan command configuration sent to the command processing
1405  * module in command preparation stage to configure a scan command structure
1406  * to send to firmware.
1407  *
1408  * The fixed fields specifying the BSS type and BSSID filters as well as a
1409  * variable number/length of TLVs are sent in the command to firmware.
1410  *
1411  * Preparation also includes -
1412  *      - Setting command ID, and proper size
1413  *      - Ensuring correct endian-ness
1414  */
1415 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1416                             struct mwifiex_scan_cmd_config *scan_cfg)
1417 {
1418         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1419
1420         /* Set fixed field variables in scan command */
1421         scan_cmd->bss_mode = scan_cfg->bss_mode;
1422         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1423                sizeof(scan_cmd->bssid));
1424         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1425
1426         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1427
1428         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1429         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1430                                           + sizeof(scan_cmd->bssid)
1431                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1432
1433         return 0;
1434 }
1435
1436 /*
1437  * This function checks compatibility of requested network with current
1438  * driver settings.
1439  */
1440 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1441                                         struct mwifiex_bssdescriptor *bss_desc)
1442 {
1443         int ret = -1;
1444
1445         if (!bss_desc)
1446                 return -1;
1447
1448         if ((mwifiex_get_cfp_by_band_and_channel_from_cfg80211(priv,
1449                         (u8) bss_desc->bss_band, (u16) bss_desc->channel))) {
1450                 switch (priv->bss_mode) {
1451                 case NL80211_IFTYPE_STATION:
1452                 case NL80211_IFTYPE_ADHOC:
1453                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1454                                                             priv->bss_mode);
1455                         if (ret)
1456                                 dev_err(priv->adapter->dev, "cannot find ssid "
1457                                         "%s\n", bss_desc->ssid.ssid);
1458                                 break;
1459                 default:
1460                                 ret = 0;
1461                 }
1462         }
1463
1464         return ret;
1465 }
1466
1467 static int
1468 mwifiex_update_curr_bss_params(struct mwifiex_private *priv, u8 *bssid,
1469                                s32 rssi, const u8 *ie_buf, size_t ie_len,
1470                                u16 beacon_period, u16 cap_info_bitmap, u8 band)
1471 {
1472         struct mwifiex_bssdescriptor *bss_desc = NULL;
1473         int ret;
1474         unsigned long flags;
1475         u8 *beacon_ie;
1476
1477         /* Allocate and fill new bss descriptor */
1478         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1479                         GFP_KERNEL);
1480         if (!bss_desc) {
1481                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1482                 return -ENOMEM;
1483         }
1484
1485         beacon_ie = kmemdup(ie_buf, ie_len, GFP_KERNEL);
1486         if (!beacon_ie) {
1487                 dev_err(priv->adapter->dev, " failed to alloc beacon_ie\n");
1488                 return -ENOMEM;
1489         }
1490
1491         ret = mwifiex_fill_new_bss_desc(priv, bssid, rssi, beacon_ie,
1492                                         ie_len, beacon_period,
1493                                         cap_info_bitmap, band, bss_desc);
1494         if (ret)
1495                 goto done;
1496
1497         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1498         if (ret)
1499                 goto done;
1500
1501         /* Update current bss descriptor parameters */
1502         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1503         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1504         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1505         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1506         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1507         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1508         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1509         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1510         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1511                 0;
1512         priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL;
1513         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1514                 0;
1515         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1516                 NULL;
1517         priv->curr_bss_params.bss_descriptor.
1518                 bss_co_2040_offset = 0;
1519         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1520         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1521         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1522         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1523                 0;
1524
1525         /* Make a copy of current BSSID descriptor */
1526         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1527                 sizeof(priv->curr_bss_params.bss_descriptor));
1528         mwifiex_save_curr_bcn(priv);
1529         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1530
1531 done:
1532         kfree(bss_desc);
1533         kfree(beacon_ie);
1534         return 0;
1535 }
1536
1537 static void mwifiex_free_bss_priv(struct cfg80211_bss *bss)
1538 {
1539         kfree(bss->priv);
1540 }
1541
1542 /*
1543  * This function handles the command response of scan.
1544  *
1545  * The response buffer for the scan command has the following
1546  * memory layout:
1547  *
1548  *      .-------------------------------------------------------------.
1549  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1550  *      .-------------------------------------------------------------.
1551  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1552  *      .-------------------------------------------------------------.
1553  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1554  *      .-------------------------------------------------------------.
1555  *      |  BSSDescription data (variable, size given in BufSize)      |
1556  *      .-------------------------------------------------------------.
1557  *      |  TLV data (variable, size calculated using Header->Size,    |
1558  *      |            BufSize and sizeof the fixed fields above)       |
1559  *      .-------------------------------------------------------------.
1560  */
1561 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1562                             struct host_cmd_ds_command *resp)
1563 {
1564         int ret = 0;
1565         struct mwifiex_adapter *adapter = priv->adapter;
1566         struct cmd_ctrl_node *cmd_node;
1567         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1568         struct mwifiex_ie_types_data *tlv_data;
1569         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1570         u8 *bss_info;
1571         u32 scan_resp_size;
1572         u32 bytes_left;
1573         u32 idx;
1574         u32 tlv_buf_size;
1575         struct mwifiex_chan_freq_power *cfp;
1576         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1577         struct chan_band_param_set *chan_band;
1578         u8 is_bgscan_resp;
1579         unsigned long flags;
1580         struct cfg80211_bss *bss;
1581
1582         is_bgscan_resp = (le16_to_cpu(resp->command)
1583                 == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1584         if (is_bgscan_resp)
1585                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1586         else
1587                 scan_rsp = &resp->params.scan_resp;
1588
1589
1590         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1591                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1592                        scan_rsp->number_of_sets);
1593                 ret = -1;
1594                 goto done;
1595         }
1596
1597         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1598         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1599                                                 bytes_left);
1600
1601         scan_resp_size = le16_to_cpu(resp->size);
1602
1603         dev_dbg(adapter->dev,
1604                 "info: SCAN_RESP: returned %d APs before parsing\n",
1605                scan_rsp->number_of_sets);
1606
1607         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1608
1609         /*
1610          * The size of the TLV buffer is equal to the entire command response
1611          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1612          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1613          *   response header (S_DS_GEN)
1614          */
1615         tlv_buf_size = scan_resp_size - (bytes_left
1616                                          + sizeof(scan_rsp->bss_descript_size)
1617                                          + sizeof(scan_rsp->number_of_sets)
1618                                          + S_DS_GEN);
1619
1620         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1621                                                  bss_desc_and_tlv_buffer +
1622                                                  bytes_left);
1623
1624         /* Search the TLV buffer space in the scan response for any valid
1625            TLVs */
1626         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1627                                              TLV_TYPE_TSFTIMESTAMP,
1628                                              (struct mwifiex_ie_types_data **)
1629                                              &tsf_tlv);
1630
1631         /* Search the TLV buffer space in the scan response for any valid
1632            TLVs */
1633         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1634                                              TLV_TYPE_CHANNELBANDLIST,
1635                                              (struct mwifiex_ie_types_data **)
1636                                              &chan_band_tlv);
1637
1638         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1639                 u8 bssid[ETH_ALEN];
1640                 s32 rssi;
1641                 const u8 *ie_buf;
1642                 size_t ie_len;
1643                 int channel = -1;
1644                 u64 network_tsf = 0;
1645                 u16 beacon_size = 0;
1646                 u32 curr_bcn_bytes;
1647                 u32 freq;
1648                 u16 beacon_period;
1649                 u16 cap_info_bitmap;
1650                 u8 *current_ptr;
1651                 struct mwifiex_bcn_param *bcn_param;
1652
1653                 if (bytes_left >= sizeof(beacon_size)) {
1654                         /* Extract & convert beacon size from command buffer */
1655                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1656                         bytes_left -= sizeof(beacon_size);
1657                         bss_info += sizeof(beacon_size);
1658                 }
1659
1660                 if (!beacon_size || beacon_size > bytes_left) {
1661                         bss_info += bytes_left;
1662                         bytes_left = 0;
1663                         return -1;
1664                 }
1665
1666                 /* Initialize the current working beacon pointer for this BSS
1667                  * iteration */
1668                 current_ptr = bss_info;
1669
1670                 /* Advance the return beacon pointer past the current beacon */
1671                 bss_info += beacon_size;
1672                 bytes_left -= beacon_size;
1673
1674                 curr_bcn_bytes = beacon_size;
1675
1676                 /*
1677                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1678                  *   and capability information
1679                  */
1680                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1681                         dev_err(adapter->dev, "InterpretIE: not enough bytes left\n");
1682                         continue;
1683                 }
1684                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1685                 current_ptr += sizeof(*bcn_param);
1686                 curr_bcn_bytes -= sizeof(*bcn_param);
1687
1688                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1689
1690                 rssi = (s32) (bcn_param->rssi);
1691                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%02X\n",
1692                                         rssi);
1693
1694                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1695
1696                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1697                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1698                                 cap_info_bitmap);
1699
1700                 /* Rest of the current buffer are IE's */
1701                 ie_buf = current_ptr;
1702                 ie_len = curr_bcn_bytes;
1703                 dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP"
1704                                       " = %d\n", curr_bcn_bytes);
1705
1706                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1707                         u8 element_id, element_len;
1708
1709                         element_id = *current_ptr;
1710                         element_len = *(current_ptr + 1);
1711                         if (curr_bcn_bytes < element_len +
1712                                         sizeof(struct ieee_types_header)) {
1713                                 dev_err(priv->adapter->dev, "%s: in processing"
1714                                         " IE, bytes left < IE length\n",
1715                                         __func__);
1716                                 goto done;
1717                         }
1718                         if (element_id == WLAN_EID_DS_PARAMS) {
1719                                 channel = *(u8 *) (current_ptr +
1720                                         sizeof(struct ieee_types_header));
1721                                 break;
1722                         }
1723
1724                         current_ptr += element_len +
1725                                         sizeof(struct ieee_types_header);
1726                         curr_bcn_bytes -= element_len +
1727                                         sizeof(struct ieee_types_header);
1728                 }
1729
1730                 /*
1731                  * If the TSF TLV was appended to the scan results, save this
1732                  * entry's TSF value in the networkTSF field.The networkTSF is
1733                  * the firmware's TSF value at the time the beacon or probe
1734                  * response was received.
1735                  */
1736                 if (tsf_tlv)
1737                         memcpy(&network_tsf,
1738                                         &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1739                                         sizeof(network_tsf));
1740
1741                 if (channel != -1) {
1742                         struct ieee80211_channel *chan;
1743                         u8 band;
1744
1745                         band = BAND_G;
1746                         if (chan_band_tlv) {
1747                                 chan_band =
1748                                         &chan_band_tlv->chan_band_param[idx];
1749                                 band = mwifiex_radio_type_to_band(
1750                                                 chan_band->radio_type
1751                                                 & (BIT(0) | BIT(1)));
1752                         }
1753
1754                         cfp = mwifiex_get_cfp_by_band_and_channel_from_cfg80211(
1755                                                 priv, (u8)band, (u16)channel);
1756
1757                         freq = cfp ? cfp->freq : 0;
1758
1759                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1760
1761                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1762                                 bss = cfg80211_inform_bss(priv->wdev->wiphy,
1763                                               chan, bssid, network_tsf,
1764                                               cap_info_bitmap, beacon_period,
1765                                               ie_buf, ie_len, rssi, GFP_KERNEL);
1766                                 *(u8 *)bss->priv = band;
1767                                 bss->free_priv = mwifiex_free_bss_priv;
1768
1769                                 if (priv->media_connected && !memcmp(bssid,
1770                                         priv->curr_bss_params.bss_descriptor
1771                                                      .mac_address, ETH_ALEN))
1772                                         mwifiex_update_curr_bss_params(priv,
1773                                                         bssid, rssi, ie_buf,
1774                                                         ie_len, beacon_period,
1775                                                         cap_info_bitmap, band);
1776                         }
1777                 } else {
1778                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1779                 }
1780         }
1781
1782         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1783         if (list_empty(&adapter->scan_pending_q)) {
1784                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1785                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1786                 adapter->scan_processing = false;
1787                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1788
1789                 /* Need to indicate IOCTL complete */
1790                 if (adapter->curr_cmd->wait_q_enabled) {
1791                         adapter->cmd_wait_q.status = 0;
1792                         mwifiex_complete_cmd(adapter, adapter->curr_cmd);
1793                 }
1794                 if (priv->report_scan_result)
1795                         priv->report_scan_result = false;
1796                 if (priv->scan_pending_on_block) {
1797                         priv->scan_pending_on_block = false;
1798                         up(&priv->async_sem);
1799                 }
1800
1801         } else {
1802                 /* Get scan command from scan_pending_q and put to
1803                    cmd_pending_q */
1804                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1805                                             struct cmd_ctrl_node, list);
1806                 list_del(&cmd_node->list);
1807                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1808
1809                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1810         }
1811
1812 done:
1813         return ret;
1814 }
1815
1816 /*
1817  * This function prepares command for background scan query.
1818  *
1819  * Preparation includes -
1820  *      - Setting command ID and proper size
1821  *      - Setting background scan flush parameter
1822  *      - Ensuring correct endian-ness
1823  */
1824 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1825 {
1826         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1827                 &cmd->params.bg_scan_query;
1828
1829         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1830         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1831                                 + S_DS_GEN);
1832
1833         bg_query->flush = 1;
1834
1835         return 0;
1836 }
1837
1838 /*
1839  * This function inserts scan command node to the scan pending queue.
1840  */
1841 void
1842 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1843                        struct cmd_ctrl_node *cmd_node)
1844 {
1845         struct mwifiex_adapter *adapter = priv->adapter;
1846         unsigned long flags;
1847
1848         cmd_node->wait_q_enabled = true;
1849         cmd_node->condition = &adapter->scan_wait_q_woken;
1850         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1851         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1852         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1853 }
1854
1855 /*
1856  * This function sends a scan command for all available channels to the
1857  * firmware, filtered on a specific SSID.
1858  */
1859 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1860                                       struct mwifiex_802_11_ssid *req_ssid)
1861 {
1862         struct mwifiex_adapter *adapter = priv->adapter;
1863         int ret = 0;
1864         struct mwifiex_user_scan_cfg *scan_cfg;
1865
1866         if (!req_ssid)
1867                 return -1;
1868
1869         if (adapter->scan_processing) {
1870                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1871                 return ret;
1872         }
1873
1874         if (priv->scan_block) {
1875                 dev_dbg(adapter->dev,
1876                         "cmd: Scan is blocked during association...\n");
1877                 return ret;
1878         }
1879
1880         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1881         if (!scan_cfg) {
1882                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1883                 return -ENOMEM;
1884         }
1885
1886         memcpy(scan_cfg->ssid_list[0].ssid, req_ssid->ssid,
1887                req_ssid->ssid_len);
1888
1889         ret = mwifiex_scan_networks(priv, scan_cfg);
1890
1891         kfree(scan_cfg);
1892         return ret;
1893 }
1894
1895 /*
1896  * Sends IOCTL request to start a scan.
1897  *
1898  * This function allocates the IOCTL request buffer, fills it
1899  * with requisite parameters and calls the IOCTL handler.
1900  *
1901  * Scan command can be issued for both normal scan and specific SSID
1902  * scan, depending upon whether an SSID is provided or not.
1903  */
1904 int mwifiex_request_scan(struct mwifiex_private *priv,
1905                          struct mwifiex_802_11_ssid *req_ssid)
1906 {
1907         int ret;
1908
1909         if (down_interruptible(&priv->async_sem)) {
1910                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1911                                                 __func__);
1912                 return -1;
1913         }
1914         priv->scan_pending_on_block = true;
1915
1916         priv->adapter->scan_wait_q_woken = false;
1917
1918         if (req_ssid && req_ssid->ssid_len != 0)
1919                 /* Specific SSID scan */
1920                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1921         else
1922                 /* Normal scan */
1923                 ret = mwifiex_scan_networks(priv, NULL);
1924
1925         if (!ret)
1926                 ret = mwifiex_wait_queue_complete(priv->adapter);
1927
1928         if (ret == -1) {
1929                 priv->scan_pending_on_block = false;
1930                 up(&priv->async_sem);
1931         }
1932
1933         return ret;
1934 }
1935
1936 /*
1937  * This function appends the vendor specific IE TLV to a buffer.
1938  */
1939 int
1940 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1941                             u16 vsie_mask, u8 **buffer)
1942 {
1943         int id, ret_len = 0;
1944         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1945
1946         if (!buffer)
1947                 return 0;
1948         if (!(*buffer))
1949                 return 0;
1950
1951         /*
1952          * Traverse through the saved vendor specific IE array and append
1953          * the selected(scan/assoc/adhoc) IE as TLV to the command
1954          */
1955         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1956                 if (priv->vs_ie[id].mask & vsie_mask) {
1957                         vs_param_set =
1958                                 (struct mwifiex_ie_types_vendor_param_set *)
1959                                 *buffer;
1960                         vs_param_set->header.type =
1961                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1962                         vs_param_set->header.len =
1963                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1964                                 & 0x00FF) + 2);
1965                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1966                                le16_to_cpu(vs_param_set->header.len));
1967                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1968                                    sizeof(struct mwifiex_ie_types_header);
1969                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1970                                    sizeof(struct mwifiex_ie_types_header);
1971                 }
1972         }
1973         return ret_len;
1974 }
1975
1976 /*
1977  * This function saves a beacon buffer of the current BSS descriptor.
1978  *
1979  * The current beacon buffer is saved so that it can be restored in the
1980  * following cases that makes the beacon buffer not to contain the current
1981  * ssid's beacon buffer.
1982  *      - The current ssid was not found somehow in the last scan.
1983  *      - The current ssid was the last entry of the scan table and overloaded.
1984  */
1985 void
1986 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1987 {
1988         struct mwifiex_bssdescriptor *curr_bss =
1989                 &priv->curr_bss_params.bss_descriptor;
1990
1991         if (!curr_bss->beacon_buf_size)
1992                 return;
1993
1994         /* allocate beacon buffer at 1st time; or if it's size has changed */
1995         if (!priv->curr_bcn_buf ||
1996                         priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1997                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1998
1999                 kfree(priv->curr_bcn_buf);
2000                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
2001                                                 GFP_KERNEL);
2002                 if (!priv->curr_bcn_buf) {
2003                         dev_err(priv->adapter->dev,
2004                                         "failed to alloc curr_bcn_buf\n");
2005                         return;
2006                 }
2007         }
2008
2009         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
2010                 curr_bss->beacon_buf_size);
2011         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2012                 priv->curr_bcn_size);
2013
2014         curr_bss->beacon_buf = priv->curr_bcn_buf;
2015
2016         /* adjust the pointers in the current BSS descriptor */
2017         if (curr_bss->bcn_wpa_ie)
2018                 curr_bss->bcn_wpa_ie =
2019                         (struct ieee_types_vendor_specific *)
2020                         (curr_bss->beacon_buf +
2021                          curr_bss->wpa_offset);
2022
2023         if (curr_bss->bcn_rsn_ie)
2024                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2025                         (curr_bss->beacon_buf +
2026                          curr_bss->rsn_offset);
2027
2028         if (curr_bss->bcn_ht_cap)
2029                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2030                         (curr_bss->beacon_buf +
2031                          curr_bss->ht_cap_offset);
2032
2033         if (curr_bss->bcn_ht_info)
2034                 curr_bss->bcn_ht_info = (struct ieee80211_ht_info *)
2035                         (curr_bss->beacon_buf +
2036                          curr_bss->ht_info_offset);
2037
2038         if (curr_bss->bcn_bss_co_2040)
2039                 curr_bss->bcn_bss_co_2040 =
2040                         (u8 *) (curr_bss->beacon_buf +
2041                                         curr_bss->bss_co_2040_offset);
2042
2043         if (curr_bss->bcn_ext_cap)
2044                 curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf +
2045                                 curr_bss->ext_cap_offset);
2046 }
2047
2048 /*
2049  * This function frees the current BSS descriptor beacon buffer.
2050  */
2051 void
2052 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2053 {
2054         kfree(priv->curr_bcn_buf);
2055         priv->curr_bcn_buf = NULL;
2056 }