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->cmd_wait_q.condition = 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++, chan_idx++) {
 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                 }
 567
 568         }
 569 }
 570
 571 /*
 572  * This function constructs and sends multiple scan config commands to
 573  * the firmware.
 574  *
 575  * Previous routines in the code flow have created a scan command configuration
 576  * with any requested TLVs.  This function splits the channel TLV into maximum
 577  * channels supported per scan lists and sends the portion of the channel TLV,
 578  * along with the other TLVs, to the firmware.
 579  */
 580 static int
 581 mwifiex_scan_channel_list(struct mwifiex_private *priv,
 582                           u32 max_chan_per_scan, u8 filtered_scan,
 583                           struct mwifiex_scan_cmd_config *scan_cfg_out,
 584                           struct mwifiex_ie_types_chan_list_param_set
 585                           *chan_tlv_out,
 586                           struct mwifiex_chan_scan_param_set *scan_chan_list)
 587 {
 588         int ret = 0;
 589         struct mwifiex_chan_scan_param_set *tmp_chan_list;
 590         struct mwifiex_chan_scan_param_set *start_chan;
 591
 592         u32 tlv_idx;
 593         u32 total_scan_time;
 594         u32 done_early;
 595
 596         if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) {
 597                 dev_dbg(priv->adapter->dev,
 598                         "info: Scan: Null detect: %p, %p, %p\n",
 599                        scan_cfg_out, chan_tlv_out, scan_chan_list);
 600                 return -1;
 601         }
 602
 603         chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
 604
 605         /* Set the temp channel struct pointer to the start of the desired
 606            list */
 607         tmp_chan_list = scan_chan_list;
 608
 609         /* Loop through the desired channel list, sending a new firmware scan
 610            commands for each max_chan_per_scan channels (or for 1,6,11
 611            individually if configured accordingly) */
 612         while (tmp_chan_list->chan_number) {
 613
 614                 tlv_idx = 0;
 615                 total_scan_time = 0;
 616                 chan_tlv_out->header.len = 0;
 617                 start_chan = tmp_chan_list;
 618                 done_early = false;
 619
 620                 /*
 621                  * Construct the Channel TLV for the scan command.  Continue to
 622                  * insert channel TLVs until:
 623                  *   - the tlv_idx hits the maximum configured per scan command
 624                  *   - the next channel to insert is 0 (end of desired channel
 625                  *     list)
 626                  *   - done_early is set (controlling individual scanning of
 627                  *     1,6,11)
 628                  */
 629                 while (tlv_idx < max_chan_per_scan
 630                        && tmp_chan_list->chan_number && !done_early) {
 631
 632                         dev_dbg(priv->adapter->dev,
 633                                 "info: Scan: Chan(%3d), Radio(%d),"
 634                                 " Mode(%d, %d), Dur(%d)\n",
 635                                tmp_chan_list->chan_number,
 636                                tmp_chan_list->radio_type,
 637                                tmp_chan_list->chan_scan_mode_bitmap
 638                                & MWIFIEX_PASSIVE_SCAN,
 639                                (tmp_chan_list->chan_scan_mode_bitmap
 640                                & MWIFIEX_DISABLE_CHAN_FILT) >> 1,
 641                                le16_to_cpu(tmp_chan_list->max_scan_time));
 642
 643                         /* Copy the current channel TLV to the command being
 644                            prepared */
 645                         memcpy(chan_tlv_out->chan_scan_param + tlv_idx,
 646                                tmp_chan_list,
 647                                sizeof(chan_tlv_out->chan_scan_param));
 648
 649                         /* Increment the TLV header length by the size
 650                            appended */
 651                         chan_tlv_out->header.len =
 652                         cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) +
 653                         (sizeof(chan_tlv_out->chan_scan_param)));
 654
 655                         /*
 656                          * The tlv buffer length is set to the number of bytes
 657                          * of the between the channel tlv pointer and the start
 658                          * of the tlv buffer.  This compensates for any TLVs
 659                          * that were appended before the channel list.
 660                          */
 661                         scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out -
 662                                                         scan_cfg_out->tlv_buf);
 663
 664                         /* Add the size of the channel tlv header and the data
 665                            length */
 666                         scan_cfg_out->tlv_buf_len +=
 667                                 (sizeof(chan_tlv_out->header)
 668                                  + le16_to_cpu(chan_tlv_out->header.len));
 669
 670                         /* Increment the index to the channel tlv we are
 671                            constructing */
 672                         tlv_idx++;
 673
 674                         /* Count the total scan time per command */
 675                         total_scan_time +=
 676                                 le16_to_cpu(tmp_chan_list->max_scan_time);
 677
 678                         done_early = false;
 679
 680                         /* Stop the loop if the *current* channel is in the
 681                            1,6,11 set and we are not filtering on a BSSID
 682                            or SSID. */
 683                         if (!filtered_scan && (tmp_chan_list->chan_number == 1
 684                                 || tmp_chan_list->chan_number == 6
 685                                 || tmp_chan_list->chan_number == 11))
 686                                 done_early = true;
 687
 688                         /* Increment the tmp pointer to the next channel to
 689                            be scanned */
 690                         tmp_chan_list++;
 691
 692                         /* Stop the loop if the *next* channel is in the 1,6,11
 693                            set.  This will cause it to be the only channel
 694                            scanned on the next interation */
 695                         if (!filtered_scan && (tmp_chan_list->chan_number == 1
 696                                 || tmp_chan_list->chan_number == 6
 697                                 || tmp_chan_list->chan_number == 11))
 698                                 done_early = true;
 699                 }
 700
 701                 /* The total scan time should be less than scan command timeout
 702                    value */
 703                 if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) {
 704                         dev_err(priv->adapter->dev, "total scan time %dms"
 705                                 " is over limit (%dms), scan skipped\n",
 706                                 total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME);
 707                         ret = -1;
 708                         break;
 709                 }
 710
 711                 priv->adapter->scan_channels = start_chan;
 712
 713                 /* Send the scan command to the firmware with the specified
 714                    cfg */
 715                 ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN,
 716                                              HostCmd_ACT_GEN_SET, 0,
 717                                              scan_cfg_out);
 718                 if (ret)
 719                         break;
 720         }
 721
 722         if (ret)
 723                 return -1;
 724
 725         return 0;
 726 }
 727
 728 /*
 729  * This function constructs a scan command configuration structure to use
 730  * in scan commands.
 731  *
 732  * Application layer or other functions can invoke network scanning
 733  * with a scan configuration supplied in a user scan configuration structure.
 734  * This structure is used as the basis of one or many scan command configuration
 735  * commands that are sent to the command processing module and eventually to the
 736  * firmware.
 737  *
 738  * This function creates a scan command configuration structure  based on the
 739  * following user supplied parameters (if present):
 740  *      - SSID filter
 741  *      - BSSID filter
 742  *      - Number of Probes to be sent
 743  *      - Channel list
 744  *
 745  * If the SSID or BSSID filter is not present, the filter is disabled/cleared.
 746  * If the number of probes is not set, adapter default setting is used.
 747  */
 748 static void
 749 mwifiex_scan_setup_scan_config(struct mwifiex_private *priv,
 750                                const struct mwifiex_user_scan_cfg *user_scan_in,
 751                                struct mwifiex_scan_cmd_config *scan_cfg_out,
 752                                struct mwifiex_ie_types_chan_list_param_set
 753                                **chan_list_out,
 754                                struct mwifiex_chan_scan_param_set
 755                                *scan_chan_list,
 756                                u8 *max_chan_per_scan, u8 *filtered_scan,
 757                                u8 *scan_current_only)
 758 {
 759         struct mwifiex_adapter *adapter = priv->adapter;
 760         struct mwifiex_ie_types_num_probes *num_probes_tlv;
 761         struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv;
 762         struct mwifiex_ie_types_rates_param_set *rates_tlv;
 763         const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
 764         u8 *tlv_pos;
 765         u32 num_probes;
 766         u32 ssid_len;
 767         u32 chan_idx;
 768         u32 scan_type;
 769         u16 scan_dur;
 770         u8 channel;
 771         u8 radio_type;
 772         u32 ssid_idx;
 773         u8 ssid_filter;
 774         u8 rates[MWIFIEX_SUPPORTED_RATES];
 775         u32 rates_size;
 776         struct mwifiex_ie_types_htcap *ht_cap;
 777
 778         /* The tlv_buf_len is calculated for each scan command.  The TLVs added
 779            in this routine will be preserved since the routine that sends the
 780            command will append channelTLVs at *chan_list_out.  The difference
 781            between the *chan_list_out and the tlv_buf start will be used to
 782            calculate the size of anything we add in this routine. */
 783         scan_cfg_out->tlv_buf_len = 0;
 784
 785         /* Running tlv pointer.  Assigned to chan_list_out at end of function
 786            so later routines know where channels can be added to the command
 787            buf */
 788         tlv_pos = scan_cfg_out->tlv_buf;
 789
 790         /* Initialize the scan as un-filtered; the flag is later set to TRUE
 791            below if a SSID or BSSID filter is sent in the command */
 792         *filtered_scan = false;
 793
 794         /* Initialize the scan as not being only on the current channel.  If
 795            the channel list is customized, only contains one channel, and is
 796            the active channel, this is set true and data flow is not halted. */
 797         *scan_current_only = false;
 798
 799         if (user_scan_in) {
 800
 801                 /* Default the ssid_filter flag to TRUE, set false under
 802                    certain wildcard conditions and qualified by the existence
 803                    of an SSID list before marking the scan as filtered */
 804                 ssid_filter = true;
 805
 806                 /* Set the BSS type scan filter, use Adapter setting if
 807                    unset */
 808                 scan_cfg_out->bss_mode =
 809                         (user_scan_in->bss_mode ? (u8) user_scan_in->
 810                          bss_mode : (u8) adapter->scan_mode);
 811
 812                 /* Set the number of probes to send, use Adapter setting
 813                    if unset */
 814                 num_probes =
 815                         (user_scan_in->num_probes ? user_scan_in->
 816                          num_probes : adapter->scan_probes);
 817
 818                 /*
 819                  * Set the BSSID filter to the incoming configuration,
 820                  * if non-zero.  If not set, it will remain disabled
 821                  * (all zeros).
 822                  */
 823                 memcpy(scan_cfg_out->specific_bssid,
 824                        user_scan_in->specific_bssid,
 825                        sizeof(scan_cfg_out->specific_bssid));
 826
 827                 for (ssid_idx = 0;
 828                      ((ssid_idx < ARRAY_SIZE(user_scan_in->ssid_list))
 829                       && (*user_scan_in->ssid_list[ssid_idx].ssid
 830                           || user_scan_in->ssid_list[ssid_idx].max_len));
 831                      ssid_idx++) {
 832
 833                         ssid_len = strlen(user_scan_in->ssid_list[ssid_idx].
 834                                           ssid) + 1;
 835
 836                         wildcard_ssid_tlv =
 837                                 (struct mwifiex_ie_types_wildcard_ssid_params *)
 838                                 tlv_pos;
 839                         wildcard_ssid_tlv->header.type =
 840                                 cpu_to_le16(TLV_TYPE_WILDCARDSSID);
 841                         wildcard_ssid_tlv->header.len = cpu_to_le16(
 842                                 (u16) (ssid_len + sizeof(wildcard_ssid_tlv->
 843                                                          max_ssid_length)));
 844                         wildcard_ssid_tlv->max_ssid_length =
 845                                 user_scan_in->ssid_list[ssid_idx].max_len;
 846
 847                         memcpy(wildcard_ssid_tlv->ssid,
 848                                user_scan_in->ssid_list[ssid_idx].ssid,
 849                                ssid_len);
 850
 851                         tlv_pos += (sizeof(wildcard_ssid_tlv->header)
 852                                 + le16_to_cpu(wildcard_ssid_tlv->header.len));
 853
 854                         dev_dbg(adapter->dev, "info: scan: ssid_list[%d]: %s, %d\n",
 855                                 ssid_idx, wildcard_ssid_tlv->ssid,
 856                                 wildcard_ssid_tlv->max_ssid_length);
 857
 858                         /* Empty wildcard ssid with a maxlen will match many or
 859                            potentially all SSIDs (maxlen == 32), therefore do
 860                            not treat the scan as
 861                            filtered. */
 862                         if (!ssid_len && wildcard_ssid_tlv->max_ssid_length)
 863                                 ssid_filter = false;
 864
 865                 }
 866
 867                 /*
 868                  *  The default number of channels sent in the command is low to
 869                  *  ensure the response buffer from the firmware does not
 870                  *  truncate scan results.  That is not an issue with an SSID
 871                  *  or BSSID filter applied to the scan results in the firmware.
 872                  */
 873                 if ((ssid_idx && ssid_filter)
 874                     || memcmp(scan_cfg_out->specific_bssid, &zero_mac,
 875                               sizeof(zero_mac)))
 876                         *filtered_scan = true;
 877         } else {
 878                 scan_cfg_out->bss_mode = (u8) adapter->scan_mode;
 879                 num_probes = adapter->scan_probes;
 880         }
 881
 882         /*
 883          *  If a specific BSSID or SSID is used, the number of channels in the
 884          *  scan command will be increased to the absolute maximum.
 885          */
 886         if (*filtered_scan)
 887                 *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN;
 888         else
 889                 *max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD;
 890
 891         /* If the input config or adapter has the number of Probes set,
 892            add tlv */
 893         if (num_probes) {
 894
 895                 dev_dbg(adapter->dev, "info: scan: num_probes = %d\n",
 896                                                 num_probes);
 897
 898                 num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos;
 899                 num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
 900                 num_probes_tlv->header.len =
 901                         cpu_to_le16(sizeof(num_probes_tlv->num_probes));
 902                 num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes);
 903
 904                 tlv_pos += sizeof(num_probes_tlv->header) +
 905                         le16_to_cpu(num_probes_tlv->header.len);
 906
 907         }
 908
 909         /* Append rates tlv */
 910         memset(rates, 0, sizeof(rates));
 911
 912         rates_size = mwifiex_get_supported_rates(priv, rates);
 913
 914         rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos;
 915         rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES);
 916         rates_tlv->header.len = cpu_to_le16((u16) rates_size);
 917         memcpy(rates_tlv->rates, rates, rates_size);
 918         tlv_pos += sizeof(rates_tlv->header) + rates_size;
 919
 920         dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size);
 921
 922         if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info)
 923             && (priv->adapter->config_bands & BAND_GN
 924                 || priv->adapter->config_bands & BAND_AN)) {
 925                 ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos;
 926                 memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap));
 927                 ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY);
 928                 ht_cap->header.len =
 929                                 cpu_to_le16(sizeof(struct ieee80211_ht_cap));
 930                 radio_type =
 931                         mwifiex_band_to_radio_type(priv->adapter->config_bands);
 932                 mwifiex_fill_cap_info(priv, radio_type, ht_cap);
 933                 tlv_pos += sizeof(struct mwifiex_ie_types_htcap);
 934         }
 935
 936         /* Append vendor specific IE TLV */
 937         mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos);
 938
 939         /*
 940          * Set the output for the channel TLV to the address in the tlv buffer
 941          *   past any TLVs that were added in this function (SSID, num_probes).
 942          *   Channel TLVs will be added past this for each scan command,
 943          *   preserving the TLVs that were previously added.
 944          */
 945         *chan_list_out =
 946                 (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos;
 947
 948         if (user_scan_in && user_scan_in->chan_list[0].chan_number) {
 949
 950                 dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n");
 951
 952                 for (chan_idx = 0;
 953                      chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX
 954                      && user_scan_in->chan_list[chan_idx].chan_number;
 955                      chan_idx++) {
 956
 957                         channel = user_scan_in->chan_list[chan_idx].chan_number;
 958                         (scan_chan_list + chan_idx)->chan_number = channel;
 959
 960                         radio_type =
 961                                 user_scan_in->chan_list[chan_idx].radio_type;
 962                         (scan_chan_list + chan_idx)->radio_type = radio_type;
 963
 964                         scan_type = user_scan_in->chan_list[chan_idx].scan_type;
 965
 966                         if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 967                                 (scan_chan_list +
 968                                  chan_idx)->chan_scan_mode_bitmap
 969                                         |= MWIFIEX_PASSIVE_SCAN;
 970                         else
 971                                 (scan_chan_list +
 972                                  chan_idx)->chan_scan_mode_bitmap
 973                                         &= ~MWIFIEX_PASSIVE_SCAN;
 974
 975                         if (user_scan_in->chan_list[chan_idx].scan_time) {
 976                                 scan_dur = (u16) user_scan_in->
 977                                         chan_list[chan_idx].scan_time;
 978                         } else {
 979                                 if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE)
 980                                         scan_dur = adapter->passive_scan_time;
 981                                 else if (*filtered_scan)
 982                                         scan_dur = adapter->specific_scan_time;
 983                                 else
 984                                         scan_dur = adapter->active_scan_time;
 985                         }
 986
 987                         (scan_chan_list + chan_idx)->min_scan_time =
 988                                 cpu_to_le16(scan_dur);
 989                         (scan_chan_list + chan_idx)->max_scan_time =
 990                                 cpu_to_le16(scan_dur);
 991                 }
 992
 993                 /* Check if we are only scanning the current channel */
 994                 if ((chan_idx == 1)
 995                     && (user_scan_in->chan_list[0].chan_number
 996                         == priv->curr_bss_params.bss_descriptor.channel)) {
 997                         *scan_current_only = true;
 998                         dev_dbg(adapter->dev,
 999                                 "info: Scan: Scanning current channel only\n");
1000                 }
1001
1002         } else {
1003                 dev_dbg(adapter->dev,
1004                                 "info: Scan: Creating full region channel list\n");
1005                 mwifiex_scan_create_channel_list(priv, user_scan_in,
1006                                                  scan_chan_list,
1007                                                  *filtered_scan);
1008         }
1009 }
1010
1011 /*
1012  * This function inspects the scan response buffer for pointers to
1013  * expected TLVs.
1014  *
1015  * TLVs can be included at the end of the scan response BSS information.
1016  *
1017  * Data in the buffer is parsed pointers to TLVs that can potentially
1018  * be passed back in the response.
1019  */
1020 static void
1021 mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter,
1022                                      struct mwifiex_ie_types_data *tlv,
1023                                      u32 tlv_buf_size, u32 req_tlv_type,
1024                                      struct mwifiex_ie_types_data **tlv_data)
1025 {
1026         struct mwifiex_ie_types_data *current_tlv;
1027         u32 tlv_buf_left;
1028         u32 tlv_type;
1029         u32 tlv_len;
1030
1031         current_tlv = tlv;
1032         tlv_buf_left = tlv_buf_size;
1033         *tlv_data = NULL;
1034
1035         dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n",
1036                                                 tlv_buf_size);
1037
1038         while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) {
1039
1040                 tlv_type = le16_to_cpu(current_tlv->header.type);
1041                 tlv_len = le16_to_cpu(current_tlv->header.len);
1042
1043                 if (sizeof(tlv->header) + tlv_len > tlv_buf_left) {
1044                         dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n");
1045                         break;
1046                 }
1047
1048                 if (req_tlv_type == tlv_type) {
1049                         switch (tlv_type) {
1050                         case TLV_TYPE_TSFTIMESTAMP:
1051                                 dev_dbg(adapter->dev, "info: SCAN_RESP: TSF "
1052                                         "timestamp TLV, len = %d\n", tlv_len);
1053                                 *tlv_data = (struct mwifiex_ie_types_data *)
1054                                         current_tlv;
1055                                 break;
1056                         case TLV_TYPE_CHANNELBANDLIST:
1057                                 dev_dbg(adapter->dev, "info: SCAN_RESP: channel"
1058                                         " band list TLV, len = %d\n", tlv_len);
1059                                 *tlv_data = (struct mwifiex_ie_types_data *)
1060                                         current_tlv;
1061                                 break;
1062                         default:
1063                                 dev_err(adapter->dev,
1064                                         "SCAN_RESP: unhandled TLV = %d\n",
1065                                        tlv_type);
1066                                 /* Give up, this seems corrupted */
1067                                 return;
1068                         }
1069                 }
1070
1071                 if (*tlv_data)
1072                         break;
1073
1074
1075                 tlv_buf_left -= (sizeof(tlv->header) + tlv_len);
1076                 current_tlv =
1077                         (struct mwifiex_ie_types_data *) (current_tlv->data +
1078                                                           tlv_len);
1079
1080         }                       /* while */
1081 }
1082
1083 /*
1084  * This function parses provided beacon buffer and updates
1085  * respective fields in bss descriptor structure.
1086  */
1087 int
1088 mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter,
1089                                 struct mwifiex_bssdescriptor *bss_entry,
1090                                 u8 *ie_buf, u32 ie_len)
1091 {
1092         int ret = 0;
1093         u8 element_id;
1094         struct ieee_types_fh_param_set *fh_param_set;
1095         struct ieee_types_ds_param_set *ds_param_set;
1096         struct ieee_types_cf_param_set *cf_param_set;
1097         struct ieee_types_ibss_param_set *ibss_param_set;
1098         u8 *current_ptr;
1099         u8 *rate;
1100         u8 element_len;
1101         u16 total_ie_len;
1102         u8 bytes_to_copy;
1103         u8 rate_size;
1104         u8 found_data_rate_ie;
1105         u32 bytes_left;
1106         struct ieee_types_vendor_specific *vendor_ie;
1107         const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 };
1108         const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 };
1109
1110         found_data_rate_ie = false;
1111         rate_size = 0;
1112         current_ptr = ie_buf;
1113         bytes_left = ie_len;
1114         bss_entry->beacon_buf = ie_buf;
1115         bss_entry->beacon_buf_size = ie_len;
1116
1117         /* Process variable IE */
1118         while (bytes_left >= 2) {
1119                 element_id = *current_ptr;
1120                 element_len = *(current_ptr + 1);
1121                 total_ie_len = element_len + sizeof(struct ieee_types_header);
1122
1123                 if (bytes_left < total_ie_len) {
1124                         dev_err(adapter->dev, "err: InterpretIE: in processing"
1125                                 " IE, bytes left < IE length\n");
1126                         return -1;
1127                 }
1128                 switch (element_id) {
1129                 case WLAN_EID_SSID:
1130                         bss_entry->ssid.ssid_len = element_len;
1131                         memcpy(bss_entry->ssid.ssid, (current_ptr + 2),
1132                                element_len);
1133                         dev_dbg(adapter->dev, "info: InterpretIE: ssid: "
1134                                               "%-32s\n", bss_entry->ssid.ssid);
1135                         break;
1136
1137                 case WLAN_EID_SUPP_RATES:
1138                         memcpy(bss_entry->data_rates, current_ptr + 2,
1139                                element_len);
1140                         memcpy(bss_entry->supported_rates, current_ptr + 2,
1141                                element_len);
1142                         rate_size = element_len;
1143                         found_data_rate_ie = true;
1144                         break;
1145
1146                 case WLAN_EID_FH_PARAMS:
1147                         fh_param_set =
1148                                 (struct ieee_types_fh_param_set *) current_ptr;
1149                         memcpy(&bss_entry->phy_param_set.fh_param_set,
1150                                fh_param_set,
1151                                sizeof(struct ieee_types_fh_param_set));
1152                         break;
1153
1154                 case WLAN_EID_DS_PARAMS:
1155                         ds_param_set =
1156                                 (struct ieee_types_ds_param_set *) current_ptr;
1157
1158                         bss_entry->channel = ds_param_set->current_chan;
1159
1160                         memcpy(&bss_entry->phy_param_set.ds_param_set,
1161                                ds_param_set,
1162                                sizeof(struct ieee_types_ds_param_set));
1163                         break;
1164
1165                 case WLAN_EID_CF_PARAMS:
1166                         cf_param_set =
1167                                 (struct ieee_types_cf_param_set *) current_ptr;
1168                         memcpy(&bss_entry->ss_param_set.cf_param_set,
1169                                cf_param_set,
1170                                sizeof(struct ieee_types_cf_param_set));
1171                         break;
1172
1173                 case WLAN_EID_IBSS_PARAMS:
1174                         ibss_param_set =
1175                                 (struct ieee_types_ibss_param_set *)
1176                                 current_ptr;
1177                         memcpy(&bss_entry->ss_param_set.ibss_param_set,
1178                                ibss_param_set,
1179                                sizeof(struct ieee_types_ibss_param_set));
1180                         break;
1181
1182                 case WLAN_EID_ERP_INFO:
1183                         bss_entry->erp_flags = *(current_ptr + 2);
1184                         break;
1185
1186                 case WLAN_EID_EXT_SUPP_RATES:
1187                         /*
1188                          * Only process extended supported rate
1189                          * if data rate is already found.
1190                          * Data rate IE should come before
1191                          * extended supported rate IE
1192                          */
1193                         if (found_data_rate_ie) {
1194                                 if ((element_len + rate_size) >
1195                                     MWIFIEX_SUPPORTED_RATES)
1196                                         bytes_to_copy =
1197                                                 (MWIFIEX_SUPPORTED_RATES -
1198                                                  rate_size);
1199                                 else
1200                                         bytes_to_copy = element_len;
1201
1202                                 rate = (u8 *) bss_entry->data_rates;
1203                                 rate += rate_size;
1204                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1205
1206                                 rate = (u8 *) bss_entry->supported_rates;
1207                                 rate += rate_size;
1208                                 memcpy(rate, current_ptr + 2, bytes_to_copy);
1209                         }
1210                         break;
1211
1212                 case WLAN_EID_VENDOR_SPECIFIC:
1213                         vendor_ie = (struct ieee_types_vendor_specific *)
1214                                         current_ptr;
1215
1216                         if (!memcmp
1217                             (vendor_ie->vend_hdr.oui, wpa_oui,
1218                              sizeof(wpa_oui))) {
1219                                 bss_entry->bcn_wpa_ie =
1220                                         (struct ieee_types_vendor_specific *)
1221                                         current_ptr;
1222                                 bss_entry->wpa_offset = (u16) (current_ptr -
1223                                                         bss_entry->beacon_buf);
1224                         } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui,
1225                                     sizeof(wmm_oui))) {
1226                                 if (total_ie_len ==
1227                                     sizeof(struct ieee_types_wmm_parameter)
1228                                     || total_ie_len ==
1229                                     sizeof(struct ieee_types_wmm_info))
1230                                         /*
1231                                          * Only accept and copy the WMM IE if
1232                                          * it matches the size expected for the
1233                                          * WMM Info IE or the WMM Parameter IE.
1234                                          */
1235                                         memcpy((u8 *) &bss_entry->wmm_ie,
1236                                                current_ptr, total_ie_len);
1237                         }
1238                         break;
1239                 case WLAN_EID_RSN:
1240                         bss_entry->bcn_rsn_ie =
1241                                 (struct ieee_types_generic *) current_ptr;
1242                         bss_entry->rsn_offset = (u16) (current_ptr -
1243                                                         bss_entry->beacon_buf);
1244                         break;
1245                 case WLAN_EID_BSS_AC_ACCESS_DELAY:
1246                         bss_entry->bcn_wapi_ie =
1247                                 (struct ieee_types_generic *) current_ptr;
1248                         bss_entry->wapi_offset = (u16) (current_ptr -
1249                                                         bss_entry->beacon_buf);
1250                         break;
1251                 case WLAN_EID_HT_CAPABILITY:
1252                         bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *)
1253                                         (current_ptr +
1254                                         sizeof(struct ieee_types_header));
1255                         bss_entry->ht_cap_offset = (u16) (current_ptr +
1256                                         sizeof(struct ieee_types_header) -
1257                                         bss_entry->beacon_buf);
1258                         break;
1259                 case WLAN_EID_HT_INFORMATION:
1260                         bss_entry->bcn_ht_info = (struct ieee80211_ht_info *)
1261                                         (current_ptr +
1262                                         sizeof(struct ieee_types_header));
1263                         bss_entry->ht_info_offset = (u16) (current_ptr +
1264                                         sizeof(struct ieee_types_header) -
1265                                         bss_entry->beacon_buf);
1266                         break;
1267                 case WLAN_EID_BSS_COEX_2040:
1268                         bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr +
1269                                         sizeof(struct ieee_types_header));
1270                         bss_entry->bss_co_2040_offset = (u16) (current_ptr +
1271                                         sizeof(struct ieee_types_header) -
1272                                                 bss_entry->beacon_buf);
1273                         break;
1274                 case WLAN_EID_EXT_CAPABILITY:
1275                         bss_entry->bcn_ext_cap = (u8 *) (current_ptr +
1276                                         sizeof(struct ieee_types_header));
1277                         bss_entry->ext_cap_offset = (u16) (current_ptr +
1278                                         sizeof(struct ieee_types_header) -
1279                                         bss_entry->beacon_buf);
1280                         break;
1281                 default:
1282                         break;
1283                 }
1284
1285                 current_ptr += element_len + 2;
1286
1287                 /* Need to account for IE ID and IE Len */
1288                 bytes_left -= (element_len + 2);
1289
1290         }       /* while (bytes_left > 2) */
1291         return ret;
1292 }
1293
1294 /*
1295  * This function converts radio type scan parameter to a band configuration
1296  * to be used in join command.
1297  */
1298 static u8
1299 mwifiex_radio_type_to_band(u8 radio_type)
1300 {
1301         switch (radio_type) {
1302         case HostCmd_SCAN_RADIO_TYPE_A:
1303                 return BAND_A;
1304         case HostCmd_SCAN_RADIO_TYPE_BG:
1305         default:
1306                 return BAND_G;
1307         }
1308 }
1309
1310 /*
1311  * This is an internal function used to start a scan based on an input
1312  * configuration.
1313  *
1314  * This uses the input user scan configuration information when provided in
1315  * order to send the appropriate scan commands to firmware to populate or
1316  * update the internal driver scan table.
1317  */
1318 int mwifiex_scan_networks(struct mwifiex_private *priv,
1319                           const struct mwifiex_user_scan_cfg *user_scan_in)
1320 {
1321         int ret = 0;
1322         struct mwifiex_adapter *adapter = priv->adapter;
1323         struct cmd_ctrl_node *cmd_node;
1324         union mwifiex_scan_cmd_config_tlv *scan_cfg_out;
1325         struct mwifiex_ie_types_chan_list_param_set *chan_list_out;
1326         u32 buf_size;
1327         struct mwifiex_chan_scan_param_set *scan_chan_list;
1328         u8 filtered_scan;
1329         u8 scan_current_chan_only;
1330         u8 max_chan_per_scan;
1331         unsigned long flags;
1332
1333         if (adapter->scan_processing) {
1334                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1335                 return ret;
1336         }
1337
1338         spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1339         adapter->scan_processing = true;
1340         spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1341
1342         if (priv->scan_block) {
1343                 dev_dbg(adapter->dev,
1344                         "cmd: Scan is blocked during association...\n");
1345                 return ret;
1346         }
1347
1348         scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv),
1349                                         GFP_KERNEL);
1350         if (!scan_cfg_out) {
1351                 dev_err(adapter->dev, "failed to alloc scan_cfg_out\n");
1352                 return -ENOMEM;
1353         }
1354
1355         buf_size = sizeof(struct mwifiex_chan_scan_param_set) *
1356                         MWIFIEX_USER_SCAN_CHAN_MAX;
1357         scan_chan_list = kzalloc(buf_size, GFP_KERNEL);
1358         if (!scan_chan_list) {
1359                 dev_err(adapter->dev, "failed to alloc scan_chan_list\n");
1360                 kfree(scan_cfg_out);
1361                 return -ENOMEM;
1362         }
1363
1364         mwifiex_scan_setup_scan_config(priv, user_scan_in,
1365                                        &scan_cfg_out->config, &chan_list_out,
1366                                        scan_chan_list, &max_chan_per_scan,
1367                                        &filtered_scan, &scan_current_chan_only);
1368
1369         ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan,
1370                                         &scan_cfg_out->config, chan_list_out,
1371                                         scan_chan_list);
1372
1373         /* Get scan command from scan_pending_q and put to cmd_pending_q */
1374         if (!ret) {
1375                 spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1376                 if (!list_empty(&adapter->scan_pending_q)) {
1377                         cmd_node = list_first_entry(&adapter->scan_pending_q,
1378                                                 struct cmd_ctrl_node, list);
1379                         list_del(&cmd_node->list);
1380                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1381                                                                         flags);
1382                         mwifiex_insert_cmd_to_pending_q(adapter, cmd_node,
1383                                                         true);
1384                 } else {
1385                         spin_unlock_irqrestore(&adapter->scan_pending_q_lock,
1386                                                flags);
1387                 }
1388         } else {
1389                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1390                 adapter->scan_processing = true;
1391                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1392         }
1393
1394         kfree(scan_cfg_out);
1395         kfree(scan_chan_list);
1396         return ret;
1397 }
1398
1399 /*
1400  * This function prepares a scan command to be sent to the firmware.
1401  *
1402  * This uses the scan command configuration sent to the command processing
1403  * module in command preparation stage to configure a scan command structure
1404  * to send to firmware.
1405  *
1406  * The fixed fields specifying the BSS type and BSSID filters as well as a
1407  * variable number/length of TLVs are sent in the command to firmware.
1408  *
1409  * Preparation also includes -
1410  *      - Setting command ID, and proper size
1411  *      - Ensuring correct endian-ness
1412  */
1413 int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd,
1414                             struct mwifiex_scan_cmd_config *scan_cfg)
1415 {
1416         struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan;
1417
1418         /* Set fixed field variables in scan command */
1419         scan_cmd->bss_mode = scan_cfg->bss_mode;
1420         memcpy(scan_cmd->bssid, scan_cfg->specific_bssid,
1421                sizeof(scan_cmd->bssid));
1422         memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len);
1423
1424         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN);
1425
1426         /* Size is equal to the sizeof(fixed portions) + the TLV len + header */
1427         cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode)
1428                                           + sizeof(scan_cmd->bssid)
1429                                           + scan_cfg->tlv_buf_len + S_DS_GEN));
1430
1431         return 0;
1432 }
1433
1434 /*
1435  * This function checks compatibility of requested network with current
1436  * driver settings.
1437  */
1438 int mwifiex_check_network_compatibility(struct mwifiex_private *priv,
1439                                         struct mwifiex_bssdescriptor *bss_desc)
1440 {
1441         int ret = -1;
1442
1443         if (!bss_desc)
1444                 return -1;
1445
1446         if ((mwifiex_get_cfp_by_band_and_channel_from_cfg80211(priv,
1447                         (u8) bss_desc->bss_band, (u16) bss_desc->channel))) {
1448                 switch (priv->bss_mode) {
1449                 case NL80211_IFTYPE_STATION:
1450                 case NL80211_IFTYPE_ADHOC:
1451                         ret = mwifiex_is_network_compatible(priv, bss_desc,
1452                                                             priv->bss_mode);
1453                         if (ret)
1454                                 dev_err(priv->adapter->dev, "cannot find ssid "
1455                                         "%s\n", bss_desc->ssid.ssid);
1456                                 break;
1457                 default:
1458                                 ret = 0;
1459                 }
1460         }
1461
1462         return ret;
1463 }
1464
1465 static int
1466 mwifiex_update_curr_bss_params(struct mwifiex_private *priv,
1467                         u8 *bssid, s32 rssi, const u8 *ie_buf,
1468                         size_t ie_len, u16 beacon_period, u16 cap_info_bitmap)
1469 {
1470         struct mwifiex_bssdescriptor *bss_desc = NULL;
1471         int ret;
1472         unsigned long flags;
1473         u8 *beacon_ie;
1474
1475         /* Allocate and fill new bss descriptor */
1476         bss_desc = kzalloc(sizeof(struct mwifiex_bssdescriptor),
1477                         GFP_KERNEL);
1478         if (!bss_desc) {
1479                 dev_err(priv->adapter->dev, " failed to alloc bss_desc\n");
1480                 return -ENOMEM;
1481         }
1482
1483         beacon_ie = kmemdup(ie_buf, ie_len, GFP_KERNEL);
1484         if (!beacon_ie) {
1485                 dev_err(priv->adapter->dev, " failed to alloc beacon_ie\n");
1486                 return -ENOMEM;
1487         }
1488
1489         ret = mwifiex_fill_new_bss_desc(priv, bssid, rssi, beacon_ie,
1490                                         ie_len, beacon_period,
1491                                         cap_info_bitmap, bss_desc);
1492         if (ret)
1493                 goto done;
1494
1495         ret = mwifiex_check_network_compatibility(priv, bss_desc);
1496         if (ret)
1497                 goto done;
1498
1499         /* Update current bss descriptor parameters */
1500         spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags);
1501         priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL;
1502         priv->curr_bss_params.bss_descriptor.wpa_offset = 0;
1503         priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL;
1504         priv->curr_bss_params.bss_descriptor.rsn_offset = 0;
1505         priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL;
1506         priv->curr_bss_params.bss_descriptor.wapi_offset = 0;
1507         priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL;
1508         priv->curr_bss_params.bss_descriptor.ht_cap_offset =
1509                 0;
1510         priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL;
1511         priv->curr_bss_params.bss_descriptor.ht_info_offset =
1512                 0;
1513         priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 =
1514                 NULL;
1515         priv->curr_bss_params.bss_descriptor.
1516                 bss_co_2040_offset = 0;
1517         priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL;
1518         priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0;
1519         priv->curr_bss_params.bss_descriptor.beacon_buf = NULL;
1520         priv->curr_bss_params.bss_descriptor.beacon_buf_size =
1521                 0;
1522
1523         /* Make a copy of current BSSID descriptor */
1524         memcpy(&priv->curr_bss_params.bss_descriptor, bss_desc,
1525                 sizeof(priv->curr_bss_params.bss_descriptor));
1526         mwifiex_save_curr_bcn(priv);
1527         spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags);
1528
1529 done:
1530         kfree(bss_desc);
1531         kfree(beacon_ie);
1532         return 0;
1533 }
1534
1535 /*
1536  * This function handles the command response of scan.
1537  *
1538  * The response buffer for the scan command has the following
1539  * memory layout:
1540  *
1541  *      .-------------------------------------------------------------.
1542  *      |  Header (4 * sizeof(t_u16)):  Standard command response hdr |
1543  *      .-------------------------------------------------------------.
1544  *      |  BufSize (t_u16) : sizeof the BSS Description data          |
1545  *      .-------------------------------------------------------------.
1546  *      |  NumOfSet (t_u8) : Number of BSS Descs returned             |
1547  *      .-------------------------------------------------------------.
1548  *      |  BSSDescription data (variable, size given in BufSize)      |
1549  *      .-------------------------------------------------------------.
1550  *      |  TLV data (variable, size calculated using Header->Size,    |
1551  *      |            BufSize and sizeof the fixed fields above)       |
1552  *      .-------------------------------------------------------------.
1553  */
1554 int mwifiex_ret_802_11_scan(struct mwifiex_private *priv,
1555                             struct host_cmd_ds_command *resp)
1556 {
1557         int ret = 0;
1558         struct mwifiex_adapter *adapter = priv->adapter;
1559         struct cmd_ctrl_node *cmd_node;
1560         struct host_cmd_ds_802_11_scan_rsp *scan_rsp;
1561         struct mwifiex_ie_types_data *tlv_data;
1562         struct mwifiex_ie_types_tsf_timestamp *tsf_tlv;
1563         u8 *bss_info;
1564         u32 scan_resp_size;
1565         u32 bytes_left;
1566         u32 idx;
1567         u32 tlv_buf_size;
1568         struct mwifiex_chan_freq_power *cfp;
1569         struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv;
1570         struct chan_band_param_set *chan_band;
1571         u8 is_bgscan_resp;
1572         unsigned long flags;
1573
1574         is_bgscan_resp = (le16_to_cpu(resp->command)
1575                 == HostCmd_CMD_802_11_BG_SCAN_QUERY);
1576         if (is_bgscan_resp)
1577                 scan_rsp = &resp->params.bg_scan_query_resp.scan_resp;
1578         else
1579                 scan_rsp = &resp->params.scan_resp;
1580
1581
1582         if (scan_rsp->number_of_sets > MWIFIEX_MAX_AP) {
1583                 dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n",
1584                        scan_rsp->number_of_sets);
1585                 ret = -1;
1586                 goto done;
1587         }
1588
1589         bytes_left = le16_to_cpu(scan_rsp->bss_descript_size);
1590         dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n",
1591                                                 bytes_left);
1592
1593         scan_resp_size = le16_to_cpu(resp->size);
1594
1595         dev_dbg(adapter->dev,
1596                 "info: SCAN_RESP: returned %d APs before parsing\n",
1597                scan_rsp->number_of_sets);
1598
1599         bss_info = scan_rsp->bss_desc_and_tlv_buffer;
1600
1601         /*
1602          * The size of the TLV buffer is equal to the entire command response
1603          *   size (scan_resp_size) minus the fixed fields (sizeof()'s), the
1604          *   BSS Descriptions (bss_descript_size as bytesLef) and the command
1605          *   response header (S_DS_GEN)
1606          */
1607         tlv_buf_size = scan_resp_size - (bytes_left
1608                                          + sizeof(scan_rsp->bss_descript_size)
1609                                          + sizeof(scan_rsp->number_of_sets)
1610                                          + S_DS_GEN);
1611
1612         tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp->
1613                                                  bss_desc_and_tlv_buffer +
1614                                                  bytes_left);
1615
1616         /* Search the TLV buffer space in the scan response for any valid
1617            TLVs */
1618         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1619                                              TLV_TYPE_TSFTIMESTAMP,
1620                                              (struct mwifiex_ie_types_data **)
1621                                              &tsf_tlv);
1622
1623         /* Search the TLV buffer space in the scan response for any valid
1624            TLVs */
1625         mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size,
1626                                              TLV_TYPE_CHANNELBANDLIST,
1627                                              (struct mwifiex_ie_types_data **)
1628                                              &chan_band_tlv);
1629
1630         for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) {
1631                 u8 bssid[ETH_ALEN];
1632                 s32 rssi;
1633                 const u8 *ie_buf;
1634                 size_t ie_len;
1635                 int channel = -1;
1636                 u64 network_tsf = 0;
1637                 u16 beacon_size = 0;
1638                 u32 curr_bcn_bytes;
1639                 u32 freq;
1640                 u16 beacon_period;
1641                 u16 cap_info_bitmap;
1642                 u8 *current_ptr;
1643                 struct mwifiex_bcn_param *bcn_param;
1644
1645                 if (bytes_left >= sizeof(beacon_size)) {
1646                         /* Extract & convert beacon size from command buffer */
1647                         memcpy(&beacon_size, bss_info, sizeof(beacon_size));
1648                         bytes_left -= sizeof(beacon_size);
1649                         bss_info += sizeof(beacon_size);
1650                 }
1651
1652                 if (!beacon_size || beacon_size > bytes_left) {
1653                         bss_info += bytes_left;
1654                         bytes_left = 0;
1655                         return -1;
1656                 }
1657
1658                 /* Initialize the current working beacon pointer for this BSS
1659                  * iteration */
1660                 current_ptr = bss_info;
1661
1662                 /* Advance the return beacon pointer past the current beacon */
1663                 bss_info += beacon_size;
1664                 bytes_left -= beacon_size;
1665
1666                 curr_bcn_bytes = beacon_size;
1667
1668                 /*
1669                  * First 5 fields are bssid, RSSI, time stamp, beacon interval,
1670                  *   and capability information
1671                  */
1672                 if (curr_bcn_bytes < sizeof(struct mwifiex_bcn_param)) {
1673                         dev_err(adapter->dev, "InterpretIE: not enough bytes left\n");
1674                         continue;
1675                 }
1676                 bcn_param = (struct mwifiex_bcn_param *)current_ptr;
1677                 current_ptr += sizeof(*bcn_param);
1678                 curr_bcn_bytes -= sizeof(*bcn_param);
1679
1680                 memcpy(bssid, bcn_param->bssid, ETH_ALEN);
1681
1682                 rssi = (s32) (bcn_param->rssi);
1683                 dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%02X\n",
1684                                         rssi);
1685
1686                 beacon_period = le16_to_cpu(bcn_param->beacon_period);
1687
1688                 cap_info_bitmap = le16_to_cpu(bcn_param->cap_info_bitmap);
1689                 dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n",
1690                                 cap_info_bitmap);
1691
1692                 /* Rest of the current buffer are IE's */
1693                 ie_buf = current_ptr;
1694                 ie_len = curr_bcn_bytes;
1695                 dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP"
1696                                       " = %d\n", curr_bcn_bytes);
1697
1698                 while (curr_bcn_bytes >= sizeof(struct ieee_types_header)) {
1699                         u8 element_id, element_len;
1700
1701                         element_id = *current_ptr;
1702                         element_len = *(current_ptr + 1);
1703                         if (curr_bcn_bytes < element_len +
1704                                         sizeof(struct ieee_types_header)) {
1705                                 dev_err(priv->adapter->dev, "%s: in processing"
1706                                         " IE, bytes left < IE length\n",
1707                                         __func__);
1708                                 goto done;
1709                         }
1710                         if (element_id == WLAN_EID_DS_PARAMS) {
1711                                 channel = *(u8 *) (current_ptr +
1712                                         sizeof(struct ieee_types_header));
1713                                 break;
1714                         }
1715
1716                         current_ptr += element_len +
1717                                         sizeof(struct ieee_types_header);
1718                         curr_bcn_bytes -= element_len +
1719                                         sizeof(struct ieee_types_header);
1720                 }
1721
1722                 /*
1723                  * If the TSF TLV was appended to the scan results, save this
1724                  * entry's TSF value in the networkTSF field.The networkTSF is
1725                  * the firmware's TSF value at the time the beacon or probe
1726                  * response was received.
1727                  */
1728                 if (tsf_tlv)
1729                         memcpy(&network_tsf,
1730                                         &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE],
1731                                         sizeof(network_tsf));
1732
1733                 if (channel != -1) {
1734                         struct ieee80211_channel *chan;
1735                         u8 band;
1736
1737                         band = BAND_G;
1738                         if (chan_band_tlv) {
1739                                 chan_band =
1740                                         &chan_band_tlv->chan_band_param[idx];
1741                                 band = mwifiex_radio_type_to_band(
1742                                                 chan_band->radio_type
1743                                                 & (BIT(0) | BIT(1)));
1744                         }
1745
1746                         cfp = mwifiex_get_cfp_by_band_and_channel_from_cfg80211(
1747                                                 priv, (u8)band, (u16)channel);
1748
1749                         freq = cfp ? cfp->freq : 0;
1750
1751                         chan = ieee80211_get_channel(priv->wdev->wiphy, freq);
1752
1753                         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
1754                                 cfg80211_inform_bss(priv->wdev->wiphy, chan,
1755                                         bssid, network_tsf, cap_info_bitmap,
1756                                         beacon_period, ie_buf, ie_len, rssi,
1757                                         GFP_KERNEL);
1758
1759                                 if (priv->media_connected && !memcmp(bssid,
1760                                         priv->curr_bss_params.bss_descriptor
1761                                                      .mac_address, ETH_ALEN))
1762                                         mwifiex_update_curr_bss_params(priv,
1763                                                         bssid, rssi, ie_buf,
1764                                                         ie_len, beacon_period,
1765                                                         cap_info_bitmap);
1766                         }
1767                 } else {
1768                         dev_dbg(adapter->dev, "missing BSS channel IE\n");
1769                 }
1770         }
1771
1772         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1773         if (list_empty(&adapter->scan_pending_q)) {
1774                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1775                 spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags);
1776                 adapter->scan_processing = false;
1777                 spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags);
1778
1779                 /* Need to indicate IOCTL complete */
1780                 if (adapter->curr_cmd->wait_q_enabled) {
1781                         adapter->cmd_wait_q.status = 0;
1782                         mwifiex_complete_cmd(adapter);
1783                 }
1784                 if (priv->report_scan_result)
1785                         priv->report_scan_result = false;
1786                 if (priv->scan_pending_on_block) {
1787                         priv->scan_pending_on_block = false;
1788                         up(&priv->async_sem);
1789                 }
1790
1791         } else {
1792                 /* Get scan command from scan_pending_q and put to
1793                    cmd_pending_q */
1794                 cmd_node = list_first_entry(&adapter->scan_pending_q,
1795                                             struct cmd_ctrl_node, list);
1796                 list_del(&cmd_node->list);
1797                 spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1798
1799                 mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true);
1800         }
1801
1802 done:
1803         return ret;
1804 }
1805
1806 /*
1807  * This function prepares command for background scan query.
1808  *
1809  * Preparation includes -
1810  *      - Setting command ID and proper size
1811  *      - Setting background scan flush parameter
1812  *      - Ensuring correct endian-ness
1813  */
1814 int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd)
1815 {
1816         struct host_cmd_ds_802_11_bg_scan_query *bg_query =
1817                 &cmd->params.bg_scan_query;
1818
1819         cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY);
1820         cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query)
1821                                 + S_DS_GEN);
1822
1823         bg_query->flush = 1;
1824
1825         return 0;
1826 }
1827
1828 /*
1829  * This function inserts scan command node to the scan pending queue.
1830  */
1831 void
1832 mwifiex_queue_scan_cmd(struct mwifiex_private *priv,
1833                        struct cmd_ctrl_node *cmd_node)
1834 {
1835         struct mwifiex_adapter *adapter = priv->adapter;
1836         unsigned long flags;
1837
1838         cmd_node->wait_q_enabled = true;
1839         spin_lock_irqsave(&adapter->scan_pending_q_lock, flags);
1840         list_add_tail(&cmd_node->list, &adapter->scan_pending_q);
1841         spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags);
1842 }
1843
1844 /*
1845  * This function sends a scan command for all available channels to the
1846  * firmware, filtered on a specific SSID.
1847  */
1848 static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv,
1849                                       struct mwifiex_802_11_ssid *req_ssid)
1850 {
1851         struct mwifiex_adapter *adapter = priv->adapter;
1852         int ret = 0;
1853         struct mwifiex_user_scan_cfg *scan_cfg;
1854
1855         if (!req_ssid)
1856                 return -1;
1857
1858         if (adapter->scan_processing) {
1859                 dev_dbg(adapter->dev, "cmd: Scan already in process...\n");
1860                 return ret;
1861         }
1862
1863         if (priv->scan_block) {
1864                 dev_dbg(adapter->dev,
1865                         "cmd: Scan is blocked during association...\n");
1866                 return ret;
1867         }
1868
1869         scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL);
1870         if (!scan_cfg) {
1871                 dev_err(adapter->dev, "failed to alloc scan_cfg\n");
1872                 return -ENOMEM;
1873         }
1874
1875         memcpy(scan_cfg->ssid_list[0].ssid, req_ssid->ssid,
1876                req_ssid->ssid_len);
1877
1878         ret = mwifiex_scan_networks(priv, scan_cfg);
1879
1880         kfree(scan_cfg);
1881         return ret;
1882 }
1883
1884 /*
1885  * Sends IOCTL request to start a scan.
1886  *
1887  * This function allocates the IOCTL request buffer, fills it
1888  * with requisite parameters and calls the IOCTL handler.
1889  *
1890  * Scan command can be issued for both normal scan and specific SSID
1891  * scan, depending upon whether an SSID is provided or not.
1892  */
1893 int mwifiex_request_scan(struct mwifiex_private *priv,
1894                          struct mwifiex_802_11_ssid *req_ssid)
1895 {
1896         int ret;
1897
1898         if (down_interruptible(&priv->async_sem)) {
1899                 dev_err(priv->adapter->dev, "%s: acquire semaphore\n",
1900                                                 __func__);
1901                 return -1;
1902         }
1903         priv->scan_pending_on_block = true;
1904
1905         priv->adapter->cmd_wait_q.condition = false;
1906
1907         if (req_ssid && req_ssid->ssid_len != 0)
1908                 /* Specific SSID scan */
1909                 ret = mwifiex_scan_specific_ssid(priv, req_ssid);
1910         else
1911                 /* Normal scan */
1912                 ret = mwifiex_scan_networks(priv, NULL);
1913
1914         if (!ret)
1915                 ret = mwifiex_wait_queue_complete(priv->adapter);
1916
1917         if (ret == -1) {
1918                 priv->scan_pending_on_block = false;
1919                 up(&priv->async_sem);
1920         }
1921
1922         return ret;
1923 }
1924
1925 /*
1926  * This function appends the vendor specific IE TLV to a buffer.
1927  */
1928 int
1929 mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv,
1930                             u16 vsie_mask, u8 **buffer)
1931 {
1932         int id, ret_len = 0;
1933         struct mwifiex_ie_types_vendor_param_set *vs_param_set;
1934
1935         if (!buffer)
1936                 return 0;
1937         if (!(*buffer))
1938                 return 0;
1939
1940         /*
1941          * Traverse through the saved vendor specific IE array and append
1942          * the selected(scan/assoc/adhoc) IE as TLV to the command
1943          */
1944         for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) {
1945                 if (priv->vs_ie[id].mask & vsie_mask) {
1946                         vs_param_set =
1947                                 (struct mwifiex_ie_types_vendor_param_set *)
1948                                 *buffer;
1949                         vs_param_set->header.type =
1950                                 cpu_to_le16(TLV_TYPE_PASSTHROUGH);
1951                         vs_param_set->header.len =
1952                                 cpu_to_le16((((u16) priv->vs_ie[id].ie[1])
1953                                 & 0x00FF) + 2);
1954                         memcpy(vs_param_set->ie, priv->vs_ie[id].ie,
1955                                le16_to_cpu(vs_param_set->header.len));
1956                         *buffer += le16_to_cpu(vs_param_set->header.len) +
1957                                    sizeof(struct mwifiex_ie_types_header);
1958                         ret_len += le16_to_cpu(vs_param_set->header.len) +
1959                                    sizeof(struct mwifiex_ie_types_header);
1960                 }
1961         }
1962         return ret_len;
1963 }
1964
1965 /*
1966  * This function saves a beacon buffer of the current BSS descriptor.
1967  *
1968  * The current beacon buffer is saved so that it can be restored in the
1969  * following cases that makes the beacon buffer not to contain the current
1970  * ssid's beacon buffer.
1971  *      - The current ssid was not found somehow in the last scan.
1972  *      - The current ssid was the last entry of the scan table and overloaded.
1973  */
1974 void
1975 mwifiex_save_curr_bcn(struct mwifiex_private *priv)
1976 {
1977         struct mwifiex_bssdescriptor *curr_bss =
1978                 &priv->curr_bss_params.bss_descriptor;
1979
1980         if (!curr_bss->beacon_buf_size)
1981                 return;
1982
1983         /* allocate beacon buffer at 1st time; or if it's size has changed */
1984         if (!priv->curr_bcn_buf ||
1985                         priv->curr_bcn_size != curr_bss->beacon_buf_size) {
1986                 priv->curr_bcn_size = curr_bss->beacon_buf_size;
1987
1988                 kfree(priv->curr_bcn_buf);
1989                 priv->curr_bcn_buf = kmalloc(curr_bss->beacon_buf_size,
1990                                                 GFP_KERNEL);
1991                 if (!priv->curr_bcn_buf) {
1992                         dev_err(priv->adapter->dev,
1993                                         "failed to alloc curr_bcn_buf\n");
1994                         return;
1995                 }
1996         }
1997
1998         memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf,
1999                 curr_bss->beacon_buf_size);
2000         dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n",
2001                 priv->curr_bcn_size);
2002
2003         curr_bss->beacon_buf = priv->curr_bcn_buf;
2004
2005         /* adjust the pointers in the current BSS descriptor */
2006         if (curr_bss->bcn_wpa_ie)
2007                 curr_bss->bcn_wpa_ie =
2008                         (struct ieee_types_vendor_specific *)
2009                         (curr_bss->beacon_buf +
2010                          curr_bss->wpa_offset);
2011
2012         if (curr_bss->bcn_rsn_ie)
2013                 curr_bss->bcn_rsn_ie = (struct ieee_types_generic *)
2014                         (curr_bss->beacon_buf +
2015                          curr_bss->rsn_offset);
2016
2017         if (curr_bss->bcn_ht_cap)
2018                 curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *)
2019                         (curr_bss->beacon_buf +
2020                          curr_bss->ht_cap_offset);
2021
2022         if (curr_bss->bcn_ht_info)
2023                 curr_bss->bcn_ht_info = (struct ieee80211_ht_info *)
2024                         (curr_bss->beacon_buf +
2025                          curr_bss->ht_info_offset);
2026
2027         if (curr_bss->bcn_bss_co_2040)
2028                 curr_bss->bcn_bss_co_2040 =
2029                         (u8 *) (curr_bss->beacon_buf +
2030                                         curr_bss->bss_co_2040_offset);
2031
2032         if (curr_bss->bcn_ext_cap)
2033                 curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf +
2034                                 curr_bss->ext_cap_offset);
2035 }
2036
2037 /*
2038  * This function frees the current BSS descriptor beacon buffer.
2039  */
2040 void
2041 mwifiex_free_curr_bcn(struct mwifiex_private *priv)
2042 {
2043         kfree(priv->curr_bcn_buf);
2044         priv->curr_bcn_buf = NULL;
2045 }