diff options
Diffstat (limited to 'drivers/net/wireless/mwifiex/scan.c')
| -rw-r--r-- | drivers/net/wireless/mwifiex/scan.c | 3025 |
1 files changed, 3025 insertions, 0 deletions
diff --git a/drivers/net/wireless/mwifiex/scan.c b/drivers/net/wireless/mwifiex/scan.c new file mode 100644 index 00000000000..5c22860fb40 --- /dev/null +++ b/drivers/net/wireless/mwifiex/scan.c @@ -0,0 +1,3025 @@ +/* + * Marvell Wireless LAN device driver: scan ioctl and command handling + * + * Copyright (C) 2011, Marvell International Ltd. + * + * This software file (the "File") is distributed by Marvell International + * Ltd. under the terms of the GNU General Public License Version 2, June 1991 + * (the "License"). You may use, redistribute and/or modify this File in + * accordance with the terms and conditions of the License, a copy of which + * is available by writing to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the + * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt. + * + * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE + * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE + * ARE EXPRESSLY DISCLAIMED. The License provides additional details about + * this warranty disclaimer. + */ + +#include "decl.h" +#include "ioctl.h" +#include "util.h" +#include "fw.h" +#include "main.h" +#include "11n.h" +#include "cfg80211.h" + +/* The maximum number of channels the firmware can scan per command */ +#define MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN 14 + +#define MWIFIEX_CHANNELS_PER_SCAN_CMD 4 + +/* Memory needed to store a max sized Channel List TLV for a firmware scan */ +#define CHAN_TLV_MAX_SIZE (sizeof(struct mwifiex_ie_types_header) \ + + (MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN \ + *sizeof(struct mwifiex_chan_scan_param_set))) + +/* Memory needed to store supported rate */ +#define RATE_TLV_MAX_SIZE (sizeof(struct mwifiex_ie_types_rates_param_set) \ + + HOSTCMD_SUPPORTED_RATES) + +/* Memory needed to store a max number/size WildCard SSID TLV for a firmware + scan */ +#define WILDCARD_SSID_TLV_MAX_SIZE \ + (MWIFIEX_MAX_SSID_LIST_LENGTH * \ + (sizeof(struct mwifiex_ie_types_wildcard_ssid_params) \ + + IEEE80211_MAX_SSID_LEN)) + +/* Maximum memory needed for a mwifiex_scan_cmd_config with all TLVs at max */ +#define MAX_SCAN_CFG_ALLOC (sizeof(struct mwifiex_scan_cmd_config) \ + + sizeof(struct mwifiex_ie_types_num_probes) \ + + sizeof(struct mwifiex_ie_types_htcap) \ + + CHAN_TLV_MAX_SIZE \ + + RATE_TLV_MAX_SIZE \ + + WILDCARD_SSID_TLV_MAX_SIZE) + + +union mwifiex_scan_cmd_config_tlv { + /* Scan configuration (variable length) */ + struct mwifiex_scan_cmd_config config; + /* Max allocated block */ + u8 config_alloc_buf[MAX_SCAN_CFG_ALLOC]; +}; + +enum cipher_suite { + CIPHER_SUITE_TKIP, + CIPHER_SUITE_CCMP, + CIPHER_SUITE_MAX +}; +static u8 mwifiex_wpa_oui[CIPHER_SUITE_MAX][4] = { + { 0x00, 0x50, 0xf2, 0x02 }, /* TKIP */ + { 0x00, 0x50, 0xf2, 0x04 }, /* AES */ +}; +static u8 mwifiex_rsn_oui[CIPHER_SUITE_MAX][4] = { + { 0x00, 0x0f, 0xac, 0x02 }, /* TKIP */ + { 0x00, 0x0f, 0xac, 0x04 }, /* AES */ +}; + +/* + * This function parses a given IE for a given OUI. + * + * This is used to parse a WPA/RSN IE to find if it has + * a given oui in PTK. + */ +static u8 +mwifiex_search_oui_in_ie(struct ie_body *iebody, u8 *oui) +{ + u8 count; + + count = iebody->ptk_cnt[0]; + + /* There could be multiple OUIs for PTK hence + 1) Take the length. + 2) Check all the OUIs for AES. + 3) If one of them is AES then pass success. */ + while (count) { + if (!memcmp(iebody->ptk_body, oui, sizeof(iebody->ptk_body))) + return MWIFIEX_OUI_PRESENT; + + --count; + if (count) + iebody = (struct ie_body *) ((u8 *) iebody + + sizeof(iebody->ptk_body)); + } + + pr_debug("info: %s: OUI is not found in PTK\n", __func__); + return MWIFIEX_OUI_NOT_PRESENT; +} + +/* + * This function checks if a given OUI is present in a RSN IE. + * + * The function first checks if a RSN IE is present or not in the + * BSS descriptor. It tries to locate the OUI only if such an IE is + * present. + */ +static u8 +mwifiex_is_rsn_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher) +{ + u8 *oui; + struct ie_body *iebody; + u8 ret = MWIFIEX_OUI_NOT_PRESENT; + + if (((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)). + ieee_hdr.element_id == WLAN_EID_RSN))) { + iebody = (struct ie_body *) + (((u8 *) bss_desc->bcn_rsn_ie->data) + + RSN_GTK_OUI_OFFSET); + oui = &mwifiex_rsn_oui[cipher][0]; + ret = mwifiex_search_oui_in_ie(iebody, oui); + if (ret) + return ret; + } + return ret; +} + +/* + * This function checks if a given OUI is present in a WPA IE. + * + * The function first checks if a WPA IE is present or not in the + * BSS descriptor. It tries to locate the OUI only if such an IE is + * present. + */ +static u8 +mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher) +{ + u8 *oui; + struct ie_body *iebody; + u8 ret = MWIFIEX_OUI_NOT_PRESENT; + + if (((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)). + vend_hdr.element_id == WLAN_EID_WPA))) { + iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data; + oui = &mwifiex_wpa_oui[cipher][0]; + ret = mwifiex_search_oui_in_ie(iebody, oui); + if (ret) + return ret; + } + return ret; +} + +/* + * This function compares two SSIDs and checks if they match. + */ +s32 +mwifiex_ssid_cmp(struct mwifiex_802_11_ssid *ssid1, + struct mwifiex_802_11_ssid *ssid2) +{ + if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len)) + return -1; + return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len); +} + +/* + * Sends IOCTL request to get the best BSS. + * + * This function allocates the IOCTL request buffer, fills it + * with requisite parameters and calls the IOCTL handler. + */ +int mwifiex_find_best_bss(struct mwifiex_private *priv, + struct mwifiex_ssid_bssid *ssid_bssid) +{ + struct mwifiex_ssid_bssid tmp_ssid_bssid; + u8 *mac; + + if (!ssid_bssid) + return -1; + + memcpy(&tmp_ssid_bssid, ssid_bssid, + sizeof(struct mwifiex_ssid_bssid)); + + if (!mwifiex_bss_ioctl_find_bss(priv, &tmp_ssid_bssid)) { + memcpy(ssid_bssid, &tmp_ssid_bssid, + sizeof(struct mwifiex_ssid_bssid)); + mac = (u8 *) &ssid_bssid->bssid; + dev_dbg(priv->adapter->dev, "cmd: found network: ssid=%s," + " %pM\n", ssid_bssid->ssid.ssid, mac); + return 0; + } + + return -1; +} + +/* + * Sends IOCTL request to start a scan with user configurations. + * + * This function allocates the IOCTL request buffer, fills it + * with requisite parameters and calls the IOCTL handler. + * + * Upon completion, it also generates a wireless event to notify + * applications. + */ +int mwifiex_set_user_scan_ioctl(struct mwifiex_private *priv, + struct mwifiex_user_scan_cfg *scan_req) +{ + int status; + + priv->adapter->cmd_wait_q.condition = false; + + status = mwifiex_scan_networks(priv, scan_req); + if (!status) + status = mwifiex_wait_queue_complete(priv->adapter); + + return status; +} + +/* + * This function checks if wapi is enabled in driver and scanned network is + * compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_wapi(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc) +{ + if (priv->sec_info.wapi_enabled && + (bss_desc->bcn_wapi_ie && + ((*(bss_desc->bcn_wapi_ie)).ieee_hdr.element_id == + WLAN_EID_BSS_AC_ACCESS_DELAY))) { + return true; + } + return false; +} + +/* + * This function checks if driver is configured with no security mode and + * scanned network is compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_no_sec(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc) +{ + if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED + && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled + && ((!bss_desc->bcn_wpa_ie) || + ((*(bss_desc->bcn_wpa_ie)).vend_hdr.element_id != + WLAN_EID_WPA)) + && ((!bss_desc->bcn_rsn_ie) || + ((*(bss_desc->bcn_rsn_ie)).ieee_hdr.element_id != + WLAN_EID_RSN)) + && !priv->sec_info.encryption_mode + && !bss_desc->privacy) { + return true; + } + return false; +} + +/* + * This function checks if static WEP is enabled in driver and scanned network + * is compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_static_wep(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc) +{ + if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_ENABLED + && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled + && bss_desc->privacy) { + return true; + } + return false; +} + +/* + * This function checks if wpa is enabled in driver and scanned network is + * compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_wpa(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc, + int index) +{ + if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED + && priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled + && ((bss_desc->bcn_wpa_ie) && ((*(bss_desc->bcn_wpa_ie)).vend_hdr. + element_id == WLAN_EID_WPA)) + /* + * Privacy bit may NOT be set in some APs like + * LinkSys WRT54G && bss_desc->privacy + */ + ) { + dev_dbg(priv->adapter->dev, "info: %s: WPA: index=%d" + " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s " + "EncMode=%#x privacy=%#x\n", __func__, index, + (bss_desc->bcn_wpa_ie) ? + (*(bss_desc->bcn_wpa_ie)). + vend_hdr.element_id : 0, + (bss_desc->bcn_rsn_ie) ? + (*(bss_desc->bcn_rsn_ie)). + ieee_hdr.element_id : 0, + (priv->sec_info.wep_status == + MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d", + (priv->sec_info.wpa_enabled) ? "e" : "d", + (priv->sec_info.wpa2_enabled) ? "e" : "d", + priv->sec_info.encryption_mode, + bss_desc->privacy); + return true; + } + return false; +} + +/* + * This function checks if wpa2 is enabled in driver and scanned network is + * compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_wpa2(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc, + int index) +{ + if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED + && !priv->sec_info.wpa_enabled && priv->sec_info.wpa2_enabled + && ((bss_desc->bcn_rsn_ie) && ((*(bss_desc->bcn_rsn_ie)).ieee_hdr. + element_id == WLAN_EID_RSN)) + /* + * Privacy bit may NOT be set in some APs like + * LinkSys WRT54G && bss_desc->privacy + */ + ) { + dev_dbg(priv->adapter->dev, "info: %s: WPA2: index=%d" + " wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s " + "EncMode=%#x privacy=%#x\n", __func__, index, + (bss_desc->bcn_wpa_ie) ? + (*(bss_desc->bcn_wpa_ie)). + vend_hdr.element_id : 0, + (bss_desc->bcn_rsn_ie) ? + (*(bss_desc->bcn_rsn_ie)). + ieee_hdr.element_id : 0, + (priv->sec_info.wep_status == + MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d", + (priv->sec_info.wpa_enabled) ? "e" : "d", + (priv->sec_info.wpa2_enabled) ? "e" : "d", + priv->sec_info.encryption_mode, + bss_desc->privacy); + return true; + } + return false; +} + +/* + * This function checks if adhoc AES is enabled in driver and scanned network is + * compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_adhoc_aes(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc) +{ + if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED + && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled + && ((!bss_desc->bcn_wpa_ie) || ((*(bss_desc->bcn_wpa_ie)).vend_hdr. + element_id != WLAN_EID_WPA)) + && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr. + element_id != WLAN_EID_RSN)) + && !priv->sec_info.encryption_mode + && bss_desc->privacy) { + return true; + } + return false; +} + +/* + * This function checks if dynamic WEP is enabled in driver and scanned network + * is compatible with it. + */ +static bool +mwifiex_is_network_compatible_for_dynamic_wep(struct mwifiex_private *priv, + struct mwifiex_bssdescriptor *bss_desc, + int index) +{ + if (priv->sec_info.wep_status == MWIFIEX_802_11_WEP_DISABLED + && !priv->sec_info.wpa_enabled && !priv->sec_info.wpa2_enabled + && ((!bss_desc->bcn_wpa_ie) || ((*(bss_desc->bcn_wpa_ie)).vend_hdr. + element_id != WLAN_EID_WPA)) + && ((!bss_desc->bcn_rsn_ie) || ((*(bss_desc->bcn_rsn_ie)).ieee_hdr. + element_id != WLAN_EID_RSN)) + && priv->sec_info.encryption_mode + && bss_desc->privacy) { + dev_dbg(priv->adapter->dev, "info: %s: dynamic " + "WEP: index=%d wpa_ie=%#x wpa2_ie=%#x " + "EncMode=%#x privacy=%#x\n", + __func__, index, + (bss_desc->bcn_wpa_ie) ? + (*(bss_desc->bcn_wpa_ie)). + vend_hdr.element_id : 0, + (bss_desc->bcn_rsn_ie) ? + (*(bss_desc->bcn_rsn_ie)). + ieee_hdr.element_id : 0, + priv->sec_info.encryption_mode, + bss_desc->privacy); + return true; + } + return false; +} + +/* + * This function checks if a scanned network is compatible with the driver + * settings. + * + * WEP WPA WPA2 ad-hoc encrypt Network + * enabled enabled enabled AES mode Privacy WPA WPA2 Compatible + * 0 0 0 0 NONE 0 0 0 yes No security + * 0 1 0 0 x 1x 1 x yes WPA (disable + * HT if no AES) + * 0 0 1 0 x 1x x 1 yes WPA2 (disable + * HT if no AES) + * 0 0 0 1 NONE 1 0 0 yes Ad-hoc AES + * 1 0 0 0 NONE 1 0 0 yes Static WEP + * (disable HT) + * 0 0 0 0 !=NONE 1 0 0 yes Dynamic WEP + * + * Compatibility is not matched while roaming, except for mode. + */ +static s32 +mwifiex_is_network_compatible(struct mwifiex_private *priv, u32 index, u32 mode) +{ + struct mwifiex_adapter *adapter = priv->adapter; + struct mwifiex_bssdescriptor *bss_desc; + + bss_desc = &adapter->scan_table[index]; + bss_desc->disable_11n = false; + + /* Don't check for compatibility if roaming */ + if (priv->media_connected && (priv->bss_mode == NL80211_IFTYPE_STATION) + && (bss_desc->bss_mode == NL80211_IFTYPE_STATION)) + return index; + + if (priv->wps.session_enable) { + dev_dbg(adapter->dev, + "info: return success directly in WPS period\n"); + return index; + } + + if (mwifiex_is_network_compatible_for_wapi(priv, bss_desc)) { + dev_dbg(adapter->dev, "info: return success for WAPI AP\n"); + return index; + } + + if (bss_desc->bss_mode == mode) { + if (mwifiex_is_network_compatible_for_no_sec(priv, bss_desc)) { + /* No security */ + return index; + } else if (mwifiex_is_network_compatible_for_static_wep(priv, + bss_desc)) { + /* Static WEP enabled */ + dev_dbg(adapter->dev, "info: Disable 11n in WEP mode.\n"); + bss_desc->disable_11n = true; + return index; + } else if (mwifiex_is_network_compatible_for_wpa(priv, bss_desc, + index)) { + /* WPA enabled */ + if (((priv->adapter->config_bands & BAND_GN + || priv->adapter->config_bands & BAND_AN) + && bss_desc->bcn_ht_cap) + && !mwifiex_is_wpa_oui_present(bss_desc, + CIPHER_SUITE_CCMP)) { + + if (mwifiex_is_wpa_oui_present(bss_desc, + CIPHER_SUITE_TKIP)) { + dev_dbg(adapter->dev, + "info: Disable 11n if AES " + "is not supported by AP\n"); + bss_desc->disable_11n = true; + } else { + return -1; + } + } + return index; + } else if (mwifiex_is_network_compatible_for_wpa2(priv, + bss_desc, index)) { + /* WPA2 enabled */ + if (((priv->adapter->config_bands & BAND_GN + || priv->adapter->config_bands & BAND_AN) + && bss_desc->bcn_ht_cap) + && !mwifiex_is_rsn_oui_present(bss_desc, + CIPHER_SUITE_CCMP)) { + + if (mwifiex_is_rsn_oui_present(bss_desc, + CIPHER_SUITE_TKIP)) { + dev_dbg(adapter->dev, + "info: Disable 11n if AES " + "is not supported by AP\n"); + bss_desc->disable_11n = true; + } else { + return -1; + } + } + return index; + } else if (mwifiex_is_network_compatible_for_adhoc_aes(priv, + bss_desc)) { + /* Ad-hoc AES enabled */ + return index; + } else if (mwifiex_is_network_compatible_for_dynamic_wep(priv, + bss_desc, index)) { + /* Dynamic WEP enabled */ + return index; + } + + /* Security doesn't match */ + dev_dbg(adapter->dev, "info: %s: failed: index=%d " + "wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s EncMode" + "=%#x privacy=%#x\n", + __func__, index, + (bss_desc->bcn_wpa_ie) ? + (*(bss_desc->bcn_wpa_ie)).vend_hdr. + element_id : 0, + (bss_desc->bcn_rsn_ie) ? + (*(bss_desc->bcn_rsn_ie)).ieee_hdr. + element_id : 0, + (priv->sec_info.wep_status == + MWIFIEX_802_11_WEP_ENABLED) ? "e" : "d", + (priv->sec_info.wpa_enabled) ? "e" : "d", + (priv->sec_info.wpa2_enabled) ? "e" : "d", + priv->sec_info.encryption_mode, bss_desc->privacy); + return -1; + } + + /* Mode doesn't match */ + return -1; +} + +/* + * This function finds the best SSID in the scan list. + * + * It searches the scan table for the best SSID that also matches the current + * adapter network preference (mode, security etc.). + */ +static s32 +mwifiex_find_best_network_in_list(struct mwifiex_private *priv) +{ + struct mwifiex_adapter *adapter = priv->adapter; + u32 mode = priv->bss_mode; + s32 best_net = -1; + s32 best_rssi = 0; + u32 i; + + dev_dbg(adapter->dev, "info: num of BSSIDs = %d\n", + adapter->num_in_scan_table); + + for (i = 0; i < adapter->num_in_scan_table; i++) { + switch (mode) { + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_ADHOC: + if (mwifiex_is_network_compatible(priv, i, mode) >= 0) { + if (SCAN_RSSI(adapter->scan_table[i].rssi) > + best_rssi) { + best_rssi = SCAN_RSSI(adapter-> + scan_table[i].rssi); + best_net = i; + } + } + break; + case NL80211_IFTYPE_UNSPECIFIED: + default: + if (SCAN_RSSI(adapter->scan_table[i].rssi) > + best_rssi) { + best_rssi = SCAN_RSSI(adapter->scan_table[i]. + rssi); + best_net = i; + } + break; + } + } + + return best_net; +} + +/* + * This function creates a channel list for the driver to scan, based + * on region/band information. + * + * This routine is used for any scan that is not provided with a + * specific channel list to scan. + */ +static void +mwifiex_scan_create_channel_list(struct mwifiex_private *priv, + const struct mwifiex_user_scan_cfg + *user_scan_in, + struct mwifiex_chan_scan_param_set + *scan_chan_list, + u8 filtered_scan) +{ + enum ieee80211_band band; + struct ieee80211_supported_band *sband; + struct ieee80211_channel *ch; + struct mwifiex_adapter *adapter = priv->adapter; + int chan_idx = 0, i; + u8 scan_type; + + for (band = 0; (band < IEEE80211_NUM_BANDS) ; band++) { + + if (!priv->wdev->wiphy->bands[band]) + continue; + + sband = priv->wdev->wiphy->bands[band]; + + for (i = 0; (i < sband->n_channels) ; i++, chan_idx++) { + ch = &sband->channels[i]; + if (ch->flags & IEEE80211_CHAN_DISABLED) + continue; + scan_chan_list[chan_idx].radio_type = band; + scan_type = ch->flags & IEEE80211_CHAN_PASSIVE_SCAN; + if (user_scan_in && + user_scan_in->chan_list[0].scan_time) + scan_chan_list[chan_idx].max_scan_time = + cpu_to_le16((u16) user_scan_in-> + chan_list[0].scan_time); + else if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE) + scan_chan_list[chan_idx].max_scan_time = + cpu_to_le16(adapter->passive_scan_time); + else + scan_chan_list[chan_idx].max_scan_time = + cpu_to_le16(adapter->active_scan_time); + if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE) + scan_chan_list[chan_idx].chan_scan_mode_bitmap + |= MWIFIEX_PASSIVE_SCAN; + else + scan_chan_list[chan_idx].chan_scan_mode_bitmap + &= ~MWIFIEX_PASSIVE_SCAN; + scan_chan_list[chan_idx].chan_number = + (u32) ch->hw_value; + if (filtered_scan) { + scan_chan_list[chan_idx].max_scan_time = + cpu_to_le16(adapter->specific_scan_time); + scan_chan_list[chan_idx].chan_scan_mode_bitmap + |= MWIFIEX_DISABLE_CHAN_FILT; + } + } + + } +} + +/* + * This function constructs and sends multiple scan config commands to + * the firmware. + * + * Previous routines in the code flow have created a scan command configuration + * with any requested TLVs. This function splits the channel TLV into maximum + * channels supported per scan lists and sends the portion of the channel TLV, + * along with the other TLVs, to the firmware. + */ +static int +mwifiex_scan_channel_list(struct mwifiex_private *priv, + u32 max_chan_per_scan, u8 filtered_scan, + struct mwifiex_scan_cmd_config *scan_cfg_out, + struct mwifiex_ie_types_chan_list_param_set + *chan_tlv_out, + struct mwifiex_chan_scan_param_set *scan_chan_list) +{ + int ret = 0; + struct mwifiex_chan_scan_param_set *tmp_chan_list; + struct mwifiex_chan_scan_param_set *start_chan; + + u32 tlv_idx; + u32 total_scan_time; + u32 done_early; + + if (!scan_cfg_out || !chan_tlv_out || !scan_chan_list) { + dev_dbg(priv->adapter->dev, + "info: Scan: Null detect: %p, %p, %p\n", + scan_cfg_out, chan_tlv_out, scan_chan_list); + return -1; + } + + chan_tlv_out->header.type = cpu_to_le16(TLV_TYPE_CHANLIST); + + /* Set the temp channel struct pointer to the start of the desired + list */ + tmp_chan_list = scan_chan_list; + + /* Loop through the desired channel list, sending a new firmware scan + commands for each max_chan_per_scan channels (or for 1,6,11 + individually if configured accordingly) */ + while (tmp_chan_list->chan_number) { + + tlv_idx = 0; + total_scan_time = 0; + chan_tlv_out->header.len = 0; + start_chan = tmp_chan_list; + done_early = false; + + /* + * Construct the Channel TLV for the scan command. Continue to + * insert channel TLVs until: + * - the tlv_idx hits the maximum configured per scan command + * - the next channel to insert is 0 (end of desired channel + * list) + * - done_early is set (controlling individual scanning of + * 1,6,11) + */ + while (tlv_idx < max_chan_per_scan + && tmp_chan_list->chan_number && !done_early) { + + dev_dbg(priv->adapter->dev, + "info: Scan: Chan(%3d), Radio(%d)," + " Mode(%d, %d), Dur(%d)\n", + tmp_chan_list->chan_number, + tmp_chan_list->radio_type, + tmp_chan_list->chan_scan_mode_bitmap + & MWIFIEX_PASSIVE_SCAN, + (tmp_chan_list->chan_scan_mode_bitmap + & MWIFIEX_DISABLE_CHAN_FILT) >> 1, + le16_to_cpu(tmp_chan_list->max_scan_time)); + + /* Copy the current channel TLV to the command being + prepared */ + memcpy(chan_tlv_out->chan_scan_param + tlv_idx, + tmp_chan_list, + sizeof(chan_tlv_out->chan_scan_param)); + + /* Increment the TLV header length by the size + appended */ + chan_tlv_out->header.len = + cpu_to_le16(le16_to_cpu(chan_tlv_out->header.len) + + (sizeof(chan_tlv_out->chan_scan_param))); + + /* + * The tlv buffer length is set to the number of bytes + * of the between the channel tlv pointer and the start + * of the tlv buffer. This compensates for any TLVs + * that were appended before the channel list. + */ + scan_cfg_out->tlv_buf_len = (u32) ((u8 *) chan_tlv_out - + scan_cfg_out->tlv_buf); + + /* Add the size of the channel tlv header and the data + length */ + scan_cfg_out->tlv_buf_len += + (sizeof(chan_tlv_out->header) + + le16_to_cpu(chan_tlv_out->header.len)); + + /* Increment the index to the channel tlv we are + constructing */ + tlv_idx++; + + /* Count the total scan time per command */ + total_scan_time += + le16_to_cpu(tmp_chan_list->max_scan_time); + + done_early = false; + + /* Stop the loop if the *current* channel is in the + 1,6,11 set and we are not filtering on a BSSID + or SSID. */ + if (!filtered_scan && (tmp_chan_list->chan_number == 1 + || tmp_chan_list->chan_number == 6 + || tmp_chan_list->chan_number == 11)) + done_early = true; + + /* Increment the tmp pointer to the next channel to + be scanned */ + tmp_chan_list++; + + /* Stop the loop if the *next* channel is in the 1,6,11 + set. This will cause it to be the only channel + scanned on the next interation */ + if (!filtered_scan && (tmp_chan_list->chan_number == 1 + || tmp_chan_list->chan_number == 6 + || tmp_chan_list->chan_number == 11)) + done_early = true; + } + + /* The total scan time should be less than scan command timeout + value */ + if (total_scan_time > MWIFIEX_MAX_TOTAL_SCAN_TIME) { + dev_err(priv->adapter->dev, "total scan time %dms" + " is over limit (%dms), scan skipped\n", + total_scan_time, MWIFIEX_MAX_TOTAL_SCAN_TIME); + ret = -1; + break; + } + + priv->adapter->scan_channels = start_chan; + + /* Send the scan command to the firmware with the specified + cfg */ + ret = mwifiex_send_cmd_async(priv, HostCmd_CMD_802_11_SCAN, + HostCmd_ACT_GEN_SET, 0, + scan_cfg_out); + if (ret) + break; + } + + if (ret) + return -1; + + return 0; +} + +/* + * This function constructs a scan command configuration structure to use + * in scan commands. + * + * Application layer or other functions can invoke network scanning + * with a scan configuration supplied in a user scan configuration structure. + * This structure is used as the basis of one or many scan command configuration + * commands that are sent to the command processing module and eventually to the + * firmware. + * + * This function creates a scan command configuration structure based on the + * following user supplied parameters (if present): + * - SSID filter + * - BSSID filter + * - Number of Probes to be sent + * - Channel list + * + * If the SSID or BSSID filter is not present, the filter is disabled/cleared. + * If the number of probes is not set, adapter default setting is used. + */ +static void +mwifiex_scan_setup_scan_config(struct mwifiex_private *priv, + const struct mwifiex_user_scan_cfg *user_scan_in, + struct mwifiex_scan_cmd_config *scan_cfg_out, + struct mwifiex_ie_types_chan_list_param_set + **chan_list_out, + struct mwifiex_chan_scan_param_set + *scan_chan_list, + u8 *max_chan_per_scan, u8 *filtered_scan, + u8 *scan_current_only) +{ + struct mwifiex_adapter *adapter = priv->adapter; + struct mwifiex_ie_types_num_probes *num_probes_tlv; + struct mwifiex_ie_types_wildcard_ssid_params *wildcard_ssid_tlv; + struct mwifiex_ie_types_rates_param_set *rates_tlv; + const u8 zero_mac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 }; + u8 *tlv_pos; + u32 num_probes; + u32 ssid_len; + u32 chan_idx; + u32 scan_type; + u16 scan_dur; + u8 channel; + u8 radio_type; + u32 ssid_idx; + u8 ssid_filter; + u8 rates[MWIFIEX_SUPPORTED_RATES]; + u32 rates_size; + struct mwifiex_ie_types_htcap *ht_cap; + + /* The tlv_buf_len is calculated for each scan command. The TLVs added + in this routine will be preserved since the routine that sends the + command will append channelTLVs at *chan_list_out. The difference + between the *chan_list_out and the tlv_buf start will be used to + calculate the size of anything we add in this routine. */ + scan_cfg_out->tlv_buf_len = 0; + + /* Running tlv pointer. Assigned to chan_list_out at end of function + so later routines know where channels can be added to the command + buf */ + tlv_pos = scan_cfg_out->tlv_buf; + + /* Initialize the scan as un-filtered; the flag is later set to TRUE + below if a SSID or BSSID filter is sent in the command */ + *filtered_scan = false; + + /* Initialize the scan as not being only on the current channel. If + the channel list is customized, only contains one channel, and is + the active channel, this is set true and data flow is not halted. */ + *scan_current_only = false; + + if (user_scan_in) { + + /* Default the ssid_filter flag to TRUE, set false under + certain wildcard conditions and qualified by the existence + of an SSID list before marking the scan as filtered */ + ssid_filter = true; + + /* Set the BSS type scan filter, use Adapter setting if + unset */ + scan_cfg_out->bss_mode = + (user_scan_in->bss_mode ? (u8) user_scan_in-> + bss_mode : (u8) adapter->scan_mode); + + /* Set the number of probes to send, use Adapter setting + if unset */ + num_probes = + (user_scan_in->num_probes ? user_scan_in-> + num_probes : adapter->scan_probes); + + /* + * Set the BSSID filter to the incoming configuration, + * if non-zero. If not set, it will remain disabled + * (all zeros). + */ + memcpy(scan_cfg_out->specific_bssid, + user_scan_in->specific_bssid, + sizeof(scan_cfg_out->specific_bssid)); + + for (ssid_idx = 0; + ((ssid_idx < ARRAY_SIZE(user_scan_in->ssid_list)) + && (*user_scan_in->ssid_list[ssid_idx].ssid + || user_scan_in->ssid_list[ssid_idx].max_len)); + ssid_idx++) { + + ssid_len = strlen(user_scan_in->ssid_list[ssid_idx]. + ssid) + 1; + + wildcard_ssid_tlv = + (struct mwifiex_ie_types_wildcard_ssid_params *) + tlv_pos; + wildcard_ssid_tlv->header.type = + cpu_to_le16(TLV_TYPE_WILDCARDSSID); + wildcard_ssid_tlv->header.len = cpu_to_le16( + (u16) (ssid_len + sizeof(wildcard_ssid_tlv-> + max_ssid_length))); + wildcard_ssid_tlv->max_ssid_length = + user_scan_in->ssid_list[ssid_idx].max_len; + + memcpy(wildcard_ssid_tlv->ssid, + user_scan_in->ssid_list[ssid_idx].ssid, + ssid_len); + + tlv_pos += (sizeof(wildcard_ssid_tlv->header) + + le16_to_cpu(wildcard_ssid_tlv->header.len)); + + dev_dbg(adapter->dev, "info: scan: ssid_list[%d]: %s, %d\n", + ssid_idx, wildcard_ssid_tlv->ssid, + wildcard_ssid_tlv->max_ssid_length); + + /* Empty wildcard ssid with a maxlen will match many or + potentially all SSIDs (maxlen == 32), therefore do + not treat the scan as + filtered. */ + if (!ssid_len && wildcard_ssid_tlv->max_ssid_length) + ssid_filter = false; + + } + + /* + * The default number of channels sent in the command is low to + * ensure the response buffer from the firmware does not + * truncate scan results. That is not an issue with an SSID + * or BSSID filter applied to the scan results in the firmware. + */ + if ((ssid_idx && ssid_filter) + || memcmp(scan_cfg_out->specific_bssid, &zero_mac, + sizeof(zero_mac))) + *filtered_scan = true; + } else { + scan_cfg_out->bss_mode = (u8) adapter->scan_mode; + num_probes = adapter->scan_probes; + } + + /* + * If a specific BSSID or SSID is used, the number of channels in the + * scan command will be increased to the absolute maximum. + */ + if (*filtered_scan) + *max_chan_per_scan = MWIFIEX_MAX_CHANNELS_PER_SPECIFIC_SCAN; + else + *max_chan_per_scan = MWIFIEX_CHANNELS_PER_SCAN_CMD; + + /* If the input config or adapter has the number of Probes set, + add tlv */ + if (num_probes) { + + dev_dbg(adapter->dev, "info: scan: num_probes = %d\n", + num_probes); + + num_probes_tlv = (struct mwifiex_ie_types_num_probes *) tlv_pos; + num_probes_tlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES); + num_probes_tlv->header.len = + cpu_to_le16(sizeof(num_probes_tlv->num_probes)); + num_probes_tlv->num_probes = cpu_to_le16((u16) num_probes); + + tlv_pos += sizeof(num_probes_tlv->header) + + le16_to_cpu(num_probes_tlv->header.len); + + } + + /* Append rates tlv */ + memset(rates, 0, sizeof(rates)); + + rates_size = mwifiex_get_supported_rates(priv, rates); + + rates_tlv = (struct mwifiex_ie_types_rates_param_set *) tlv_pos; + rates_tlv->header.type = cpu_to_le16(WLAN_EID_SUPP_RATES); + rates_tlv->header.len = cpu_to_le16((u16) rates_size); + memcpy(rates_tlv->rates, rates, rates_size); + tlv_pos += sizeof(rates_tlv->header) + rates_size; + + dev_dbg(adapter->dev, "info: SCAN_CMD: Rates size = %d\n", rates_size); + + if (ISSUPP_11NENABLED(priv->adapter->fw_cap_info) + && (priv->adapter->config_bands & BAND_GN + || priv->adapter->config_bands & BAND_AN)) { + ht_cap = (struct mwifiex_ie_types_htcap *) tlv_pos; + memset(ht_cap, 0, sizeof(struct mwifiex_ie_types_htcap)); + ht_cap->header.type = cpu_to_le16(WLAN_EID_HT_CAPABILITY); + ht_cap->header.len = + cpu_to_le16(sizeof(struct ieee80211_ht_cap)); + radio_type = + mwifiex_band_to_radio_type(priv->adapter->config_bands); + mwifiex_fill_cap_info(priv, radio_type, ht_cap); + tlv_pos += sizeof(struct mwifiex_ie_types_htcap); + } + + /* Append vendor specific IE TLV */ + mwifiex_cmd_append_vsie_tlv(priv, MWIFIEX_VSIE_MASK_SCAN, &tlv_pos); + + /* + * Set the output for the channel TLV to the address in the tlv buffer + * past any TLVs that were added in this function (SSID, num_probes). + * Channel TLVs will be added past this for each scan command, + * preserving the TLVs that were previously added. + */ + *chan_list_out = + (struct mwifiex_ie_types_chan_list_param_set *) tlv_pos; + + if (user_scan_in && user_scan_in->chan_list[0].chan_number) { + + dev_dbg(adapter->dev, "info: Scan: Using supplied channel list\n"); + + for (chan_idx = 0; + chan_idx < MWIFIEX_USER_SCAN_CHAN_MAX + && user_scan_in->chan_list[chan_idx].chan_number; + chan_idx++) { + + channel = user_scan_in->chan_list[chan_idx].chan_number; + (scan_chan_list + chan_idx)->chan_number = channel; + + radio_type = + user_scan_in->chan_list[chan_idx].radio_type; + (scan_chan_list + chan_idx)->radio_type = radio_type; + + scan_type = user_scan_in->chan_list[chan_idx].scan_type; + + if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE) + (scan_chan_list + + chan_idx)->chan_scan_mode_bitmap + |= MWIFIEX_PASSIVE_SCAN; + else + (scan_chan_list + + chan_idx)->chan_scan_mode_bitmap + &= ~MWIFIEX_PASSIVE_SCAN; + + if (user_scan_in->chan_list[chan_idx].scan_time) { + scan_dur = (u16) user_scan_in-> + chan_list[chan_idx].scan_time; + } else { + if (scan_type == MWIFIEX_SCAN_TYPE_PASSIVE) + scan_dur = adapter->passive_scan_time; + else if (*filtered_scan) + scan_dur = adapter->specific_scan_time; + else + scan_dur = adapter->active_scan_time; + } + + (scan_chan_list + chan_idx)->min_scan_time = + cpu_to_le16(scan_dur); + (scan_chan_list + chan_idx)->max_scan_time = + cpu_to_le16(scan_dur); + } + + /* Check if we are only scanning the current channel */ + if ((chan_idx == 1) + && (user_scan_in->chan_list[0].chan_number + == priv->curr_bss_params.bss_descriptor.channel)) { + *scan_current_only = true; + dev_dbg(adapter->dev, + "info: Scan: Scanning current channel only\n"); + } + + } else { + dev_dbg(adapter->dev, + "info: Scan: Creating full region channel list\n"); + mwifiex_scan_create_channel_list(priv, user_scan_in, + scan_chan_list, + *filtered_scan); + } +} + +/* + * This function inspects the scan response buffer for pointers to + * expected TLVs. + * + * TLVs can be included at the end of the scan response BSS information. + * + * Data in the buffer is parsed pointers to TLVs that can potentially + * be passed back in the response. + */ +static void +mwifiex_ret_802_11_scan_get_tlv_ptrs(struct mwifiex_adapter *adapter, + struct mwifiex_ie_types_data *tlv, + u32 tlv_buf_size, u32 req_tlv_type, + struct mwifiex_ie_types_data **tlv_data) +{ + struct mwifiex_ie_types_data *current_tlv; + u32 tlv_buf_left; + u32 tlv_type; + u32 tlv_len; + + current_tlv = tlv; + tlv_buf_left = tlv_buf_size; + *tlv_data = NULL; + + dev_dbg(adapter->dev, "info: SCAN_RESP: tlv_buf_size = %d\n", + tlv_buf_size); + + while (tlv_buf_left >= sizeof(struct mwifiex_ie_types_header)) { + + tlv_type = le16_to_cpu(current_tlv->header.type); + tlv_len = le16_to_cpu(current_tlv->header.len); + + if (sizeof(tlv->header) + tlv_len > tlv_buf_left) { + dev_err(adapter->dev, "SCAN_RESP: TLV buffer corrupt\n"); + break; + } + + if (req_tlv_type == tlv_type) { + switch (tlv_type) { + case TLV_TYPE_TSFTIMESTAMP: + dev_dbg(adapter->dev, "info: SCAN_RESP: TSF " + "timestamp TLV, len = %d\n", tlv_len); + *tlv_data = (struct mwifiex_ie_types_data *) + current_tlv; + break; + case TLV_TYPE_CHANNELBANDLIST: + dev_dbg(adapter->dev, "info: SCAN_RESP: channel" + " band list TLV, len = %d\n", tlv_len); + *tlv_data = (struct mwifiex_ie_types_data *) + current_tlv; + break; + default: + dev_err(adapter->dev, + "SCAN_RESP: unhandled TLV = %d\n", + tlv_type); + /* Give up, this seems corrupted */ + return; + } + } + + if (*tlv_data) + break; + + + tlv_buf_left -= (sizeof(tlv->header) + tlv_len); + current_tlv = + (struct mwifiex_ie_types_data *) (current_tlv->data + + tlv_len); + + } /* while */ +} + +/* + * This function interprets a BSS scan response returned from the firmware. + * + * The various fixed fields and IEs are parsed and passed back for a BSS + * probe response or beacon from scan command. Information is recorded as + * needed in the scan table for that entry. + * + * The following IE types are recognized and parsed - + * - SSID + * - Supported rates + * - FH parameters set + * - DS parameters set + * - CF parameters set + * - IBSS parameters set + * - ERP information + * - Extended supported rates + * - Vendor specific (221) + * - RSN IE + * - WAPI IE + * - HT capability + * - HT operation + * - BSS Coexistence 20/40 + * - Extended capability + * - Overlapping BSS scan parameters + */ +static int +mwifiex_interpret_bss_desc_with_ie(struct mwifiex_adapter *adapter, + struct mwifiex_bssdescriptor *bss_entry, + u8 **beacon_info, u32 *bytes_left) +{ + int ret = 0; + u8 element_id; + struct ieee_types_fh_param_set *fh_param_set; + struct ieee_types_ds_param_set *ds_param_set; + struct ieee_types_cf_param_set *cf_param_set; + struct ieee_types_ibss_param_set *ibss_param_set; + __le16 beacon_interval; + __le16 capabilities; + u8 *current_ptr; + u8 *rate; + u8 element_len; + u16 total_ie_len; + u8 bytes_to_copy; + u8 rate_size; + u16 beacon_size; + u8 found_data_rate_ie; + u32 bytes_left_for_current_beacon; + struct ieee_types_vendor_specific *vendor_ie; + const u8 wpa_oui[4] = { 0x00, 0x50, 0xf2, 0x01 }; + const u8 wmm_oui[4] = { 0x00, 0x50, 0xf2, 0x02 }; + + found_data_rate_ie = false; + rate_size = 0; + beacon_size = 0; + + if (*bytes_left >= sizeof(beacon_size)) { + /* Extract & convert beacon size from the command buffer */ + memcpy(&beacon_size, *beacon_info, sizeof(beacon_size)); + *bytes_left -= sizeof(beacon_size); + *beacon_info += sizeof(beacon_size); + } + + if (!beacon_size || beacon_size > *bytes_left) { + *beacon_info += *bytes_left; + *bytes_left = 0; + return -1; + } + + /* Initialize the current working beacon pointer for this BSS + iteration */ + current_ptr = *beacon_info; + + /* Advance the return beacon pointer past the current beacon */ + *beacon_info += beacon_size; + *bytes_left -= beacon_size; + + bytes_left_for_current_beacon = beacon_size; + + memcpy(bss_entry->mac_address, current_ptr, ETH_ALEN); + dev_dbg(adapter->dev, "info: InterpretIE: AP MAC Addr: %pM\n", + bss_entry->mac_address); + + current_ptr += ETH_ALEN; + bytes_left_for_current_beacon -= ETH_ALEN; + + if (bytes_left_for_current_beacon < 12) { + dev_err(adapter->dev, "InterpretIE: not enough bytes left\n"); + return -1; + } + + /* + * Next 4 fields are RSSI, time stamp, beacon interval, + * and capability information + */ + + /* RSSI is 1 byte long */ + bss_entry->rssi = (s32) (*current_ptr); + dev_dbg(adapter->dev, "info: InterpretIE: RSSI=%02X\n", *current_ptr); + current_ptr += 1; + bytes_left_for_current_beacon -= 1; + + /* + * The RSSI is not part of the beacon/probe response. After we have + * advanced current_ptr past the RSSI field, save the remaining + * data for use at the application layer + */ + bss_entry->beacon_buf = current_ptr; + bss_entry->beacon_buf_size = bytes_left_for_current_beacon; + + /* Time stamp is 8 bytes long */ + memcpy(bss_entry->time_stamp, current_ptr, 8); + current_ptr += 8; + bytes_left_for_current_beacon -= 8; + + /* Beacon interval is 2 bytes long */ + memcpy(&beacon_interval, current_ptr, 2); + bss_entry->beacon_period = le16_to_cpu(beacon_interval); + current_ptr += 2; + bytes_left_for_current_beacon -= 2; + + /* Capability information is 2 bytes long */ + memcpy(&capabilities, current_ptr, 2); + dev_dbg(adapter->dev, "info: InterpretIE: capabilities=0x%X\n", + capabilities); + bss_entry->cap_info_bitmap = le16_to_cpu(capabilities); + current_ptr += 2; + bytes_left_for_current_beacon -= 2; + + /* Rest of the current buffer are IE's */ + dev_dbg(adapter->dev, "info: InterpretIE: IELength for this AP = %d\n", + bytes_left_for_current_beacon); + + if (bss_entry->cap_info_bitmap & WLAN_CAPABILITY_PRIVACY) { + dev_dbg(adapter->dev, "info: InterpretIE: AP WEP enabled\n"); + bss_entry->privacy = MWIFIEX_802_11_PRIV_FILTER_8021X_WEP; + } else { + bss_entry->privacy = MWIFIEX_802_11_PRIV_FILTER_ACCEPT_ALL; + } + + if (bss_entry->cap_info_bitmap & WLAN_CAPABILITY_IBSS) + bss_entry->bss_mode = NL80211_IFTYPE_ADHOC; + else + bss_entry->bss_mode = NL80211_IFTYPE_STATION; + + + /* Process variable IE */ + while (bytes_left_for_current_beacon >= 2) { + element_id = *current_ptr; + element_len = *(current_ptr + 1); + total_ie_len = element_len + sizeof(struct ieee_types_header); + + if (bytes_left_for_current_beacon < total_ie_len) { + dev_err(adapter->dev, "err: InterpretIE: in processing" + " IE, bytes left < IE length\n"); + bytes_left_for_current_beacon = 0; + ret = -1; + continue; + } + switch (element_id) { + case WLAN_EID_SSID: + bss_entry->ssid.ssid_len = element_len; + memcpy(bss_entry->ssid.ssid, (current_ptr + 2), + element_len); + dev_dbg(adapter->dev, "info: InterpretIE: ssid: %-32s\n", + bss_entry->ssid.ssid); + break; + + case WLAN_EID_SUPP_RATES: + memcpy(bss_entry->data_rates, current_ptr + 2, + element_len); + memcpy(bss_entry->supported_rates, current_ptr + 2, + element_len); + rate_size = element_len; + found_data_rate_ie = true; + break; + + case WLAN_EID_FH_PARAMS: + fh_param_set = + (struct ieee_types_fh_param_set *) current_ptr; + memcpy(&bss_entry->phy_param_set.fh_param_set, + fh_param_set, + sizeof(struct ieee_types_fh_param_set)); + break; + + case WLAN_EID_DS_PARAMS: + ds_param_set = + (struct ieee_types_ds_param_set *) current_ptr; + + bss_entry->channel = ds_param_set->current_chan; + + memcpy(&bss_entry->phy_param_set.ds_param_set, + ds_param_set, + sizeof(struct ieee_types_ds_param_set)); + break; + + case WLAN_EID_CF_PARAMS: + cf_param_set = + (struct ieee_types_cf_param_set *) current_ptr; + memcpy(&bss_entry->ss_param_set.cf_param_set, + cf_param_set, + sizeof(struct ieee_types_cf_param_set)); + break; + + case WLAN_EID_IBSS_PARAMS: + ibss_param_set = + (struct ieee_types_ibss_param_set *) + current_ptr; + memcpy(&bss_entry->ss_param_set.ibss_param_set, + ibss_param_set, + sizeof(struct ieee_types_ibss_param_set)); + break; + + case WLAN_EID_ERP_INFO: + bss_entry->erp_flags = *(current_ptr + 2); + break; + + case WLAN_EID_EXT_SUPP_RATES: + /* + * Only process extended supported rate + * if data rate is already found. + * Data rate IE should come before + * extended supported rate IE + */ + if (found_data_rate_ie) { + if ((element_len + rate_size) > + MWIFIEX_SUPPORTED_RATES) + bytes_to_copy = + (MWIFIEX_SUPPORTED_RATES - + rate_size); + else + bytes_to_copy = element_len; + + rate = (u8 *) bss_entry->data_rates; + rate += rate_size; + memcpy(rate, current_ptr + 2, bytes_to_copy); + + rate = (u8 *) bss_entry->supported_rates; + rate += rate_size; + memcpy(rate, current_ptr + 2, bytes_to_copy); + } + break; + + case WLAN_EID_VENDOR_SPECIFIC: + vendor_ie = (struct ieee_types_vendor_specific *) + current_ptr; + + if (!memcmp + (vendor_ie->vend_hdr.oui, wpa_oui, + sizeof(wpa_oui))) { + bss_entry->bcn_wpa_ie = + (struct ieee_types_vendor_specific *) + current_ptr; + bss_entry->wpa_offset = (u16) (current_ptr - + bss_entry->beacon_buf); + } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui, + sizeof(wmm_oui))) { + if (total_ie_len == + sizeof(struct ieee_types_wmm_parameter) + || total_ie_len == + sizeof(struct ieee_types_wmm_info)) + /* + * Only accept and copy the WMM IE if + * it matches the size expected for the + * WMM Info IE or the WMM Parameter IE. + */ + memcpy((u8 *) &bss_entry->wmm_ie, + current_ptr, total_ie_len); + } + break; + case WLAN_EID_RSN: + bss_entry->bcn_rsn_ie = + (struct ieee_types_generic *) current_ptr; + bss_entry->rsn_offset = (u16) (current_ptr - + bss_entry->beacon_buf); + break; + case WLAN_EID_BSS_AC_ACCESS_DELAY: + bss_entry->bcn_wapi_ie = + (struct ieee_types_generic *) current_ptr; + bss_entry->wapi_offset = (u16) (current_ptr - + bss_entry->beacon_buf); + break; + case WLAN_EID_HT_CAPABILITY: + bss_entry->bcn_ht_cap = (struct ieee80211_ht_cap *) + (current_ptr + + sizeof(struct ieee_types_header)); + bss_entry->ht_cap_offset = (u16) (current_ptr + + sizeof(struct ieee_types_header) - + bss_entry->beacon_buf); + break; + case WLAN_EID_HT_INFORMATION: + bss_entry->bcn_ht_info = (struct ieee80211_ht_info *) + (current_ptr + + sizeof(struct ieee_types_header)); + bss_entry->ht_info_offset = (u16) (current_ptr + + sizeof(struct ieee_types_header) - + bss_entry->beacon_buf); + break; + case WLAN_EID_BSS_COEX_2040: + bss_entry->bcn_bss_co_2040 = (u8 *) (current_ptr + + sizeof(struct ieee_types_header)); + bss_entry->bss_co_2040_offset = (u16) (current_ptr + + sizeof(struct ieee_types_header) - + bss_entry->beacon_buf); + break; + case WLAN_EID_EXT_CAPABILITY: + bss_entry->bcn_ext_cap = (u8 *) (current_ptr + + sizeof(struct ieee_types_header)); + bss_entry->ext_cap_offset = (u16) (current_ptr + + sizeof(struct ieee_types_header) - + bss_entry->beacon_buf); + break; + case WLAN_EID_OVERLAP_BSS_SCAN_PARAM: + bss_entry->bcn_obss_scan = + (struct ieee_types_obss_scan_param *) + current_ptr; + bss_entry->overlap_bss_offset = (u16) (current_ptr - + bss_entry->beacon_buf); + break; + default: + break; + } + + current_ptr += element_len + 2; + + /* Need to account for IE ID and IE Len */ + bytes_left_for_current_beacon -= (element_len + 2); + + } /* while (bytes_left_for_current_beacon > 2) */ + return ret; +} + +/* + * This function adjusts the pointers used in beacon buffers to reflect + * shifts. + * + * The memory allocated for beacon buffers is of fixed sizes where all the + * saved beacons must be stored. New beacons are added in the free portion + * of this memory, space permitting; while duplicate beacon buffers are + * placed at the same start location. However, since duplicate beacon + * buffers may not match the size of the old one, all the following buffers + * in the memory must be shifted to either make space, or to fill up freed + * up space. + * + * This function is used to update the beacon buffer pointers that are past + * an existing beacon buffer that is updated with a new one of different + * size. The pointers are shifted by a fixed amount, either forward or + * backward. + * + * the following pointers in every affected beacon buffers are changed, if + * present - + * - WPA IE pointer + * - RSN IE pointer + * - WAPI IE pointer + * - HT capability IE pointer + * - HT information IE pointer + * - BSS coexistence 20/40 IE pointer + * - Extended capability IE pointer + * - Overlapping BSS scan parameter IE pointer + */ +static void +mwifiex_adjust_beacon_buffer_ptrs(struct mwifiex_private *priv, u8 advance, + u8 *bcn_store, u32 rem_bcn_size, + u32 num_of_ent) +{ + struct mwifiex_adapter *adapter = priv->adapter; + u32 adj_idx; + for (adj_idx = 0; adj_idx < num_of_ent; adj_idx++) { + if (adapter->scan_table[adj_idx].beacon_buf > bcn_store) { + + if (advance) + adapter->scan_table[adj_idx].beacon_buf += + rem_bcn_size; + else + adapter->scan_table[adj_idx].beacon_buf -= + rem_bcn_size; + + if (adapter->scan_table[adj_idx].bcn_wpa_ie) + adapter->scan_table[adj_idx].bcn_wpa_ie = + (struct ieee_types_vendor_specific *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].wpa_offset); + if (adapter->scan_table[adj_idx].bcn_rsn_ie) + adapter->scan_table[adj_idx].bcn_rsn_ie = + (struct ieee_types_generic *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].rsn_offset); + if (adapter->scan_table[adj_idx].bcn_wapi_ie) + adapter->scan_table[adj_idx].bcn_wapi_ie = + (struct ieee_types_generic *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].wapi_offset); + if (adapter->scan_table[adj_idx].bcn_ht_cap) + adapter->scan_table[adj_idx].bcn_ht_cap = + (struct ieee80211_ht_cap *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].ht_cap_offset); + + if (adapter->scan_table[adj_idx].bcn_ht_info) + adapter->scan_table[adj_idx].bcn_ht_info = + (struct ieee80211_ht_info *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].ht_info_offset); + if (adapter->scan_table[adj_idx].bcn_bss_co_2040) + adapter->scan_table[adj_idx].bcn_bss_co_2040 = + (u8 *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].bss_co_2040_offset); + if (adapter->scan_table[adj_idx].bcn_ext_cap) + adapter->scan_table[adj_idx].bcn_ext_cap = + (u8 *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].ext_cap_offset); + if (adapter->scan_table[adj_idx].bcn_obss_scan) + adapter->scan_table[adj_idx].bcn_obss_scan = + (struct ieee_types_obss_scan_param *) + (adapter->scan_table[adj_idx].beacon_buf + + adapter->scan_table[adj_idx].overlap_bss_offset); + } + } +} + +/* + * This function updates the pointers used in beacon buffer for given bss + * descriptor to reflect shifts + * + * Following pointers are updated + * - WPA IE pointer + * - RSN IE pointer + * - WAPI IE pointer + * - HT capability IE pointer + * - HT information IE pointer + * - BSS coexistence 20/40 IE pointer + * - Extended capability IE pointer + * - Overlapping BSS scan parameter IE pointer + */ +static void +mwifiex_update_beacon_buffer_ptrs(struct mwifiex_bssdescriptor *beacon) +{ + if (beacon->bcn_wpa_ie) + beacon->bcn_wpa_ie = (struct ieee_types_vendor_specific *) + (beacon->beacon_buf + beacon->wpa_offset); + if (beacon->bcn_rsn_ie) + beacon->bcn_rsn_ie = (struct ieee_types_generic *) + (beacon->beacon_buf + beacon->rsn_offset); + if (beacon->bcn_wapi_ie) + beacon->bcn_wapi_ie = (struct ieee_types_generic *) + (beacon->beacon_buf + beacon->wapi_offset); + if (beacon->bcn_ht_cap) + beacon->bcn_ht_cap = (struct ieee80211_ht_cap *) + (beacon->beacon_buf + beacon->ht_cap_offset); + if (beacon->bcn_ht_info) + beacon->bcn_ht_info = (struct ieee80211_ht_info *) + (beacon->beacon_buf + beacon->ht_info_offset); + if (beacon->bcn_bss_co_2040) + beacon->bcn_bss_co_2040 = (u8 *) (beacon->beacon_buf + + beacon->bss_co_2040_offset); + if (beacon->bcn_ext_cap) + beacon->bcn_ext_cap = (u8 *) (beacon->beacon_buf + + beacon->ext_cap_offset); + if (beacon->bcn_obss_scan) + beacon->bcn_obss_scan = (struct ieee_types_obss_scan_param *) + (beacon->beacon_buf + beacon->overlap_bss_offset); +} + +/* + * This function stores a beacon or probe response for a BSS returned + * in the scan. + * + * This stores a new scan response or an update for a previous scan response. + * New entries need to verify that they do not exceed the total amount of + * memory allocated for the table. + * + * Replacement entries need to take into consideration the amount of space + * currently allocated for the beacon/probe response and adjust the entry + * as needed. + * + * A small amount of extra pad (SCAN_BEACON_ENTRY_PAD) is generally reserved + * for an entry in case it is a beacon since a probe response for the + * network will by larger per the standard. This helps to reduce the + * amount of memory copying to fit a new probe response into an entry + * already occupied by a network's previously stored beacon. + */ +static void +mwifiex_ret_802_11_scan_store_beacon(struct mwifiex_private *priv, + u32 beacon_idx, u32 num_of_ent, + struct mwifiex_bssdescriptor *new_beacon) +{ + struct mwifiex_adapter *adapter = priv->adapter; + u8 *bcn_store; + u32 new_bcn_size; + u32 old_bcn_size; + u32 bcn_space; + + if (adapter->scan_table[beacon_idx].beacon_buf) { + + new_bcn_size = new_beacon->beacon_buf_size; + old_bcn_size = adapter->scan_table[beacon_idx].beacon_buf_size; + bcn_space = adapter->scan_table[beacon_idx].beacon_buf_size_max; + bcn_store = adapter->scan_table[beacon_idx].beacon_buf; + + /* Set the max to be the same as current entry unless changed + below */ + new_beacon->beacon_buf_size_max = bcn_space; + if (new_bcn_size == old_bcn_size) { + /* + * Beacon is the same size as the previous entry. + * Replace the previous contents with the scan result + */ + memcpy(bcn_store, new_beacon->beacon_buf, + new_beacon->beacon_buf_size); + + } else if (new_bcn_size <= bcn_space) { + /* + * New beacon size will fit in the amount of space + * we have previously allocated for it + */ + + /* Copy the new beacon buffer entry over the old one */ + memcpy(bcn_store, new_beacon->beacon_buf, new_bcn_size); + + /* + * If the old beacon size was less than the maximum + * we had alloted for the entry, and the new entry + * is even smaller, reset the max size to the old + * beacon entry and compress the storage space + * (leaving a new pad space of (old_bcn_size - + * new_bcn_size). + */ + if (old_bcn_size < bcn_space + && new_bcn_size <= old_bcn_size) { + /* + * Old Beacon size is smaller than the alloted + * storage size. Shrink the alloted storage + * space. + */ + dev_dbg(adapter->dev, "info: AppControl:" + " smaller duplicate beacon " + "(%d), old = %d, new = %d, space = %d," + "left = %d\n", + beacon_idx, old_bcn_size, new_bcn_size, + bcn_space, + (int)(sizeof(adapter->bcn_buf) - + (adapter->bcn_buf_end - + adapter->bcn_buf))); + + /* + * memmove (since the memory overlaps) the + * data after the beacon we just stored to the + * end of the current beacon. This cleans up + * any unused space the old larger beacon was + * using in the buffer + */ + memmove(bcn_store + old_bcn_size, + bcn_store + bcn_space, + adapter->bcn_buf_end - (bcn_store + + bcn_space)); + + /* + * Decrement the end pointer by the difference + * between the old larger size and the new + * smaller size since we are using less space + * due to the new beacon being smaller + */ + adapter->bcn_buf_end -= + (bcn_space - old_bcn_size); + + /* Set the maximum storage size to the old + beacon size */ + new_beacon->beacon_buf_size_max = old_bcn_size; + + /* Adjust beacon buffer pointers that are past + the current */ + mwifiex_adjust_beacon_buffer_ptrs(priv, 0, + bcn_store, (bcn_space - old_bcn_size), + num_of_ent); + } + } else if (adapter->bcn_buf_end + (new_bcn_size - bcn_space) + < (adapter->bcn_buf + sizeof(adapter->bcn_buf))) { + /* + * Beacon is larger than space previously allocated + * (bcn_space) and there is enough space left in the + * beaconBuffer to store the additional data + */ + dev_dbg(adapter->dev, "info: AppControl:" + " larger duplicate beacon (%d), " + "old = %d, new = %d, space = %d, left = %d\n", + beacon_idx, old_bcn_size, new_bcn_size, + bcn_space, + (int)(sizeof(adapter->bcn_buf) - + (adapter->bcn_buf_end - + adapter->bcn_buf))); + + /* + * memmove (since the memory overlaps) the data + * after the beacon we just stored to the end of + * the current beacon. This moves the data for + * the beacons after this further in memory to + * make space for the new larger beacon we are + * about to copy in. + */ + memmove(bcn_store + new_bcn_size, + bcn_store + bcn_space, + adapter->bcn_buf_end - (bcn_store + bcn_space)); + + /* Copy the new beacon buffer entry over the old one */ + memcpy(bcn_store, new_beacon->beacon_buf, new_bcn_size); + + /* Move the beacon end pointer by the amount of new + beacon data we are adding */ + adapter->bcn_buf_end += (new_bcn_size - bcn_space); + + /* + * This entry is bigger than the alloted max space + * previously reserved. Increase the max space to + * be equal to the new beacon size + */ + new_beacon->beacon_buf_size_max = new_bcn_size; + + /* Adjust beacon buffer pointers that are past the + current */ + mwifiex_adjust_beacon_buffer_ptrs(priv, 1, bcn_store, + (new_bcn_size - bcn_space), + num_of_ent); + } else { + /* + * Beacon is larger than the previously allocated space, + * but there is not enough free space to store the + * additional data. + */ + dev_err(adapter->dev, "AppControl: larger duplicate " + " beacon (%d), old = %d new = %d, space = %d," + " left = %d\n", beacon_idx, old_bcn_size, + new_bcn_size, bcn_space, + (int)(sizeof(adapter->bcn_buf) - + (adapter->bcn_buf_end - adapter->bcn_buf))); + + /* Storage failure, keep old beacon intact */ + new_beacon->beacon_buf_size = old_bcn_size; + if (new_beacon->bcn_wpa_ie) + new_beacon->wpa_offset = + adapter->scan_table[beacon_idx]. + wpa_offset; + if (new_beacon->bcn_rsn_ie) + new_beacon->rsn_offset = + adapter->scan_table[beacon_idx]. + rsn_offset; + if (new_beacon->bcn_wapi_ie) + new_beacon->wapi_offset = + adapter->scan_table[beacon_idx]. + wapi_offset; + if (new_beacon->bcn_ht_cap) + new_beacon->ht_cap_offset = + adapter->scan_table[beacon_idx]. + ht_cap_offset; + if (new_beacon->bcn_ht_info) + new_beacon->ht_info_offset = + adapter->scan_table[beacon_idx]. + ht_info_offset; + if (new_beacon->bcn_bss_co_2040) + new_beacon->bss_co_2040_offset = + adapter->scan_table[beacon_idx]. + bss_co_2040_offset; + if (new_beacon->bcn_ext_cap) + new_beacon->ext_cap_offset = + adapter->scan_table[beacon_idx]. + ext_cap_offset; + if (new_beacon->bcn_obss_scan) + new_beacon->overlap_bss_offset = + adapter->scan_table[beacon_idx]. + overlap_bss_offset; + } + /* Point the new entry to its permanent storage space */ + new_beacon->beacon_buf = bcn_store; + mwifiex_update_beacon_buffer_ptrs(new_beacon); + } else { + /* + * No existing beacon data exists for this entry, check to see + * if we can fit it in the remaining space + */ + if (adapter->bcn_buf_end + new_beacon->beacon_buf_size + + SCAN_BEACON_ENTRY_PAD < (adapter->bcn_buf + + sizeof(adapter->bcn_buf))) { + + /* + * Copy the beacon buffer data from the local entry to + * the adapter dev struct buffer space used to store + * the raw beacon data for each entry in the scan table + */ + memcpy(adapter->bcn_buf_end, new_beacon->beacon_buf, + new_beacon->beacon_buf_size); + + /* Update the beacon ptr to point to the table save + area */ + new_beacon->beacon_buf = adapter->bcn_buf_end; + new_beacon->beacon_buf_size_max = + (new_beacon->beacon_buf_size + + SCAN_BEACON_ENTRY_PAD); + + mwifiex_update_beacon_buffer_ptrs(new_beacon); + + /* Increment the end pointer by the size reserved */ + adapter->bcn_buf_end += new_beacon->beacon_buf_size_max; + + dev_dbg(adapter->dev, "info: AppControl: beacon[%02d]" + " sz=%03d, used = %04d, left = %04d\n", + beacon_idx, + new_beacon->beacon_buf_size, + (int)(adapter->bcn_buf_end - adapter->bcn_buf), + (int)(sizeof(adapter->bcn_buf) - + (adapter->bcn_buf_end - + adapter->bcn_buf))); + } else { + /* No space for new beacon */ + dev_dbg(adapter->dev, "info: AppControl: no space for" + " beacon (%d): %pM sz=%03d, left=%03d\n", + beacon_idx, new_beacon->mac_address, + new_beacon->beacon_buf_size, + (int)(sizeof(adapter->bcn_buf) - + (adapter->bcn_buf_end - + adapter->bcn_buf))); + + /* Storage failure; clear storage records for this + bcn */ + new_beacon->beacon_buf = NULL; + new_beacon->beacon_buf_size = 0; + new_beacon->beacon_buf_size_max = 0; + new_beacon->bcn_wpa_ie = NULL; + new_beacon->wpa_offset = 0; + new_beacon->bcn_rsn_ie = NULL; + new_beacon->rsn_offset = 0; + new_beacon->bcn_wapi_ie = NULL; + new_beacon->wapi_offset = 0; + new_beacon->bcn_ht_cap = NULL; + new_beacon->ht_cap_offset = 0; + new_beacon->bcn_ht_info = NULL; + new_beacon->ht_info_offset = 0; + new_beacon->bcn_bss_co_2040 = NULL; + new_beacon->bss_co_2040_offset = 0; + new_beacon->bcn_ext_cap = NULL; + new_beacon->ext_cap_offset = 0; + new_beacon->bcn_obss_scan = NULL; + new_beacon->overlap_bss_offset = 0; + } + } +} + +/* + * This function restores a beacon buffer of the current BSS descriptor. + */ +static void mwifiex_restore_curr_bcn(struct mwifiex_private *priv) +{ + struct mwifiex_adapter *adapter = priv->adapter; + struct mwifiex_bssdescriptor *curr_bss = + &priv->curr_bss_params.bss_descriptor; + unsigned long flags; + + if (priv->curr_bcn_buf && + ((adapter->bcn_buf_end + priv->curr_bcn_size) < + (adapter->bcn_buf + sizeof(adapter->bcn_buf)))) { + spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags); + + /* restore the current beacon buffer */ + memcpy(adapter->bcn_buf_end, priv->curr_bcn_buf, + priv->curr_bcn_size); + curr_bss->beacon_buf = adapter->bcn_buf_end; + curr_bss->beacon_buf_size = priv->curr_bcn_size; + adapter->bcn_buf_end += priv->curr_bcn_size; + + /* adjust the pointers in the current BSS descriptor */ + if (curr_bss->bcn_wpa_ie) + curr_bss->bcn_wpa_ie = + (struct ieee_types_vendor_specific *) + (curr_bss->beacon_buf + + curr_bss->wpa_offset); + + if (curr_bss->bcn_rsn_ie) + curr_bss->bcn_rsn_ie = (struct ieee_types_generic *) + (curr_bss->beacon_buf + + curr_bss->rsn_offset); + + if (curr_bss->bcn_ht_cap) + curr_bss->bcn_ht_cap = (struct ieee80211_ht_cap *) + (curr_bss->beacon_buf + + curr_bss->ht_cap_offset); + + if (curr_bss->bcn_ht_info) + curr_bss->bcn_ht_info = (struct ieee80211_ht_info *) + (curr_bss->beacon_buf + + curr_bss->ht_info_offset); + + if (curr_bss->bcn_bss_co_2040) + curr_bss->bcn_bss_co_2040 = + (u8 *) (curr_bss->beacon_buf + + curr_bss->bss_co_2040_offset); + + if (curr_bss->bcn_ext_cap) + curr_bss->bcn_ext_cap = (u8 *) (curr_bss->beacon_buf + + curr_bss->ext_cap_offset); + + if (curr_bss->bcn_obss_scan) + curr_bss->bcn_obss_scan = + (struct ieee_types_obss_scan_param *) + (curr_bss->beacon_buf + + curr_bss->overlap_bss_offset); + + spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags); + + dev_dbg(adapter->dev, "info: current beacon restored %d\n", + priv->curr_bcn_size); + } else { + dev_warn(adapter->dev, + "curr_bcn_buf not saved or bcn_buf has no space\n"); + } +} + +/* + * This function post processes the scan table after a new scan command has + * completed. + * + * It inspects each entry of the scan table and tries to find an entry that + * matches with our current associated/joined network from the scan. If + * one is found, the stored copy of the BSS descriptor of our current network + * is updated. + * + * It also debug dumps the current scan table contents after processing is over. + */ +static void +mwifiex_process_scan_results(struct mwifiex_private *priv) +{ + struct mwifiex_adapter *adapter = priv->adapter; + s32 j; + u32 i; + unsigned long flags; + + if (priv->media_connected) { + + j = mwifiex_find_ssid_in_list(priv, &priv->curr_bss_params. + bss_descriptor.ssid, + priv->curr_bss_params. + bss_descriptor.mac_address, + priv->bss_mode); + + if (j >= 0) { + spin_lock_irqsave(&priv->curr_bcn_buf_lock, flags); + priv->curr_bss_params.bss_descriptor.bcn_wpa_ie = NULL; + priv->curr_bss_params.bss_descriptor.wpa_offset = 0; + priv->curr_bss_params.bss_descriptor.bcn_rsn_ie = NULL; + priv->curr_bss_params.bss_descriptor.rsn_offset = 0; + priv->curr_bss_params.bss_descriptor.bcn_wapi_ie = NULL; + priv->curr_bss_params.bss_descriptor.wapi_offset = 0; + priv->curr_bss_params.bss_descriptor.bcn_ht_cap = NULL; + priv->curr_bss_params.bss_descriptor.ht_cap_offset = + 0; + priv->curr_bss_params.bss_descriptor.bcn_ht_info = NULL; + priv->curr_bss_params.bss_descriptor.ht_info_offset = + 0; + priv->curr_bss_params.bss_descriptor.bcn_bss_co_2040 = + NULL; + priv->curr_bss_params.bss_descriptor. + bss_co_2040_offset = 0; + priv->curr_bss_params.bss_descriptor.bcn_ext_cap = NULL; + priv->curr_bss_params.bss_descriptor.ext_cap_offset = 0; + priv->curr_bss_params.bss_descriptor. + bcn_obss_scan = NULL; + priv->curr_bss_params.bss_descriptor. + overlap_bss_offset = 0; + priv->curr_bss_params.bss_descriptor.beacon_buf = NULL; + priv->curr_bss_params.bss_descriptor.beacon_buf_size = + 0; + priv->curr_bss_params.bss_descriptor. + beacon_buf_size_max = 0; + + dev_dbg(adapter->dev, "info: Found current ssid/bssid" + " in list @ index #%d\n", j); + /* Make a copy of current BSSID descriptor */ + memcpy(&priv->curr_bss_params.bss_descriptor, + &adapter->scan_table[j], + sizeof(priv->curr_bss_params.bss_descriptor)); + + mwifiex_save_curr_bcn(priv); + spin_unlock_irqrestore(&priv->curr_bcn_buf_lock, flags); + + } else { + mwifiex_restore_curr_bcn(priv); + } + } + + for (i = 0; i < adapter->num_in_scan_table; i++) + dev_dbg(adapter->dev, "info: scan:(%02d) %pM " + "RSSI[%03d], SSID[%s]\n", + i, adapter->scan_table[i].mac_address, + (s32) adapter->scan_table[i].rssi, + adapter->scan_table[i].ssid.ssid); +} + +/* + * This function converts radio type scan parameter to a band configuration + * to be used in join command. + */ +static u8 +mwifiex_radio_type_to_band(u8 radio_type) +{ + switch (radio_type) { + case HostCmd_SCAN_RADIO_TYPE_A: + return BAND_A; + case HostCmd_SCAN_RADIO_TYPE_BG: + default: + return BAND_G; + } +} + +/* + * This function deletes a specific indexed entry from the scan table. + * + * This also compacts the remaining entries and adjusts any buffering + * of beacon/probe response data if needed. + */ +static void +mwifiex_scan_delete_table_entry(struct mwifiex_private *priv, s32 table_idx) +{ + struct mwifiex_adapter *adapter = priv->adapter; + u32 del_idx; + u32 beacon_buf_adj; + u8 *beacon_buf; + + /* + * Shift the saved beacon buffer data for the scan table back over the + * entry being removed. Update the end of buffer pointer. Save the + * deleted buffer allocation size for pointer adjustments for entries + * compacted after the deleted index. + */ + beacon_buf_adj = adapter->scan_table[table_idx].beacon_buf_size_max; + + dev_dbg(adapter->dev, "info: Scan: Delete Entry %d, beacon buffer " + "removal = %d bytes\n", table_idx, beacon_buf_adj); + + /* Check if the table entry had storage allocated for its beacon */ + if (beacon_buf_adj) { + beacon_buf = adapter->scan_table[table_idx].beacon_buf; + + /* + * Remove the entry's buffer space, decrement the table end + * pointer by the amount we are removing + */ + adapter->bcn_buf_end -= beacon_buf_adj; + + dev_dbg(adapter->dev, "info: scan: delete entry %d," + " compact data: %p <- %p (sz = %d)\n", + table_idx, beacon_buf, + beacon_buf + beacon_buf_adj, + (int)(adapter->bcn_buf_end - beacon_buf)); + + /* + * Compact data storage. Copy all data after the deleted + * entry's end address (beacon_buf + beacon_buf_adj) back + * to the original start address (beacon_buf). + * + * Scan table entries affected by the move will have their + * entry pointer adjusted below. + * + * Use memmove since the dest/src memory regions overlap. + */ + memmove(beacon_buf, beacon_buf + beacon_buf_adj, + adapter->bcn_buf_end - beacon_buf); + } + + dev_dbg(adapter->dev, + "info: Scan: Delete Entry %d, num_in_scan_table = %d\n", + table_idx, adapter->num_in_scan_table); + + /* Shift all of the entries after the table_idx back by one, compacting + the table and removing the requested entry */ + for (del_idx = table_idx; (del_idx + 1) < adapter->num_in_scan_table; + del_idx++) { + /* Copy the next entry over this one */ + memcpy(adapter->scan_table + del_idx, + adapter->scan_table + del_idx + 1, + sizeof(struct mwifiex_bssdescriptor)); + + /* + * Adjust this entry's pointer to its beacon buffer based on + * the removed/compacted entry from the deleted index. Don't + * decrement if the buffer pointer is NULL (no data stored for + * this entry). + */ + if (adapter->scan_table[del_idx].beacon_buf) { + adapter->scan_table[del_idx].beacon_buf -= + beacon_buf_adj; + if (adapter->scan_table[del_idx].bcn_wpa_ie) + adapter->scan_table[del_idx].bcn_wpa_ie = + (struct ieee_types_vendor_specific *) + (adapter->scan_table[del_idx]. + beacon_buf + + adapter->scan_table[del_idx]. + wpa_offset); + if (adapter->scan_table[del_idx].bcn_rsn_ie) + adapter->scan_table[del_idx].bcn_rsn_ie = + (struct ieee_types_generic *) + (adapter->scan_table[del_idx]. + beacon_buf + + adapter->scan_table[del_idx]. + rsn_offset); + if (adapter->scan_table[del_idx].bcn_wapi_ie) + adapter->scan_table[del_idx].bcn_wapi_ie = + (struct ieee_types_generic *) + (adapter->scan_table[del_idx].beacon_buf + + adapter->scan_table[del_idx]. + wapi_offset); + if (adapter->scan_table[del_idx].bcn_ht_cap) + adapter->scan_table[del_idx].bcn_ht_cap = + (struct ieee80211_ht_cap *) + (adapter->scan_table[del_idx].beacon_buf + + adapter->scan_table[del_idx]. + ht_cap_offset); + + if (adapter->scan_table[del_idx].bcn_ht_info) + adapter->scan_table[del_idx].bcn_ht_info = + (struct ieee80211_ht_info *) + (adapter->scan_table[del_idx].beacon_buf + + adapter->scan_table[del_idx]. + ht_info_offset); + if (adapter->scan_table[del_idx].bcn_bss_co_2040) + adapter->scan_table[del_idx].bcn_bss_co_2040 = + (u8 *) + (adapter->scan_table[del_idx].beacon_buf + + adapter->scan_table[del_idx]. + bss_co_2040_offset); + if (adapter->scan_table[del_idx].bcn_ext_cap) + adapter->scan_table[del_idx].bcn_ext_cap = + (u8 *) + (adapter->scan_table[del_idx].beacon_buf + + adapter->scan_table[del_idx]. + ext_cap_offset); + if (adapter->scan_table[del_idx].bcn_obss_scan) + adapter->scan_table[del_idx]. + bcn_obss_scan = + (struct ieee_types_obss_scan_param *) + (adapter->scan_table[del_idx].beacon_buf + + adapter->scan_table[del_idx]. + overlap_bss_offset); + } + } + + /* The last entry is invalid now that it has been deleted or moved + back */ + memset(adapter->scan_table + adapter->num_in_scan_table - 1, + 0x00, sizeof(struct mwifiex_bssdescriptor)); + + adapter->num_in_scan_table--; +} + +/* + * This function deletes all occurrences of a given SSID from the scan table. + * + * This iterates through the scan table and deletes all entries that match + * the given SSID. It also compacts the remaining scan table entries. + */ +static int +mwifiex_scan_delete_ssid_table_entry(struct mwifiex_private *priv, + struct mwifiex_802_11_ssid *del_ssid) +{ + s32 table_idx = -1; + + dev_dbg(priv->adapter->dev, "info: scan: delete ssid entry: %-32s\n", + del_ssid->ssid); + + /* If the requested SSID is found in the table, delete it. Then keep + searching the table for multiple entires for the SSID until no + more are found */ + while ((table_idx = mwifiex_find_ssid_in_list(priv, del_ssid, NULL, + NL80211_IFTYPE_UNSPECIFIED)) >= 0) { + dev_dbg(priv->adapter->dev, + "info: Scan: Delete SSID Entry: Found Idx = %d\n", + table_idx); + mwifiex_scan_delete_table_entry(priv, table_idx); + } + + return table_idx == -1 ? -1 : 0; +} + +/* + * This is an internal function used to start a scan based on an input + * configuration. + * + * This uses the input user scan configuration information when provided in + * order to send the appropriate scan commands to firmware to populate or + * update the internal driver scan table. + */ +int mwifiex_scan_networks(struct mwifiex_private *priv, + const struct mwifiex_user_scan_cfg *user_scan_in) +{ + int ret = 0; + struct mwifiex_adapter *adapter = priv->adapter; + struct cmd_ctrl_node *cmd_node; + union mwifiex_scan_cmd_config_tlv *scan_cfg_out; + struct mwifiex_ie_types_chan_list_param_set *chan_list_out; + u32 buf_size; + struct mwifiex_chan_scan_param_set *scan_chan_list; + u8 keep_previous_scan; + u8 filtered_scan; + u8 scan_current_chan_only; + u8 max_chan_per_scan; + unsigned long flags; + + if (adapter->scan_processing) { + dev_dbg(adapter->dev, "cmd: Scan already in process...\n"); + return ret; + } + + spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags); + adapter->scan_processing = true; + spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags); + + if (priv->scan_block) { + dev_dbg(adapter->dev, + "cmd: Scan is blocked during association...\n"); + return ret; + } + + scan_cfg_out = kzalloc(sizeof(union mwifiex_scan_cmd_config_tlv), + GFP_KERNEL); + if (!scan_cfg_out) { + dev_err(adapter->dev, "failed to alloc scan_cfg_out\n"); + return -ENOMEM; + } + + buf_size = sizeof(struct mwifiex_chan_scan_param_set) * + MWIFIEX_USER_SCAN_CHAN_MAX; + scan_chan_list = kzalloc(buf_size, GFP_KERNEL); + if (!scan_chan_list) { + dev_err(adapter->dev, "failed to alloc scan_chan_list\n"); + kfree(scan_cfg_out); + return -ENOMEM; + } + + keep_previous_scan = false; + + mwifiex_scan_setup_scan_config(priv, user_scan_in, + &scan_cfg_out->config, &chan_list_out, + scan_chan_list, &max_chan_per_scan, + &filtered_scan, &scan_current_chan_only); + + if (user_scan_in) + keep_previous_scan = user_scan_in->keep_previous_scan; + + + if (!keep_previous_scan) { + memset(adapter->scan_table, 0x00, + sizeof(struct mwifiex_bssdescriptor) * IW_MAX_AP); + adapter->num_in_scan_table = 0; + adapter->bcn_buf_end = adapter->bcn_buf; + } + + ret = mwifiex_scan_channel_list(priv, max_chan_per_scan, filtered_scan, + &scan_cfg_out->config, chan_list_out, + scan_chan_list); + + /* Get scan command from scan_pending_q and put to cmd_pending_q */ + if (!ret) { + spin_lock_irqsave(&adapter->scan_pending_q_lock, flags); + if (!list_empty(&adapter->scan_pending_q)) { + cmd_node = list_first_entry(&adapter->scan_pending_q, + struct cmd_ctrl_node, list); + list_del(&cmd_node->list); + spin_unlock_irqrestore(&adapter->scan_pending_q_lock, + flags); + mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, + true); + } else { + spin_unlock_irqrestore(&adapter->scan_pending_q_lock, + flags); + } + } else { + spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags); + adapter->scan_processing = true; + spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags); + } + + kfree(scan_cfg_out); + kfree(scan_chan_list); + return ret; +} + +/* + * This function prepares a scan command to be sent to the firmware. + * + * This uses the scan command configuration sent to the command processing + * module in command preparation stage to configure a scan command structure + * to send to firmware. + * + * The fixed fields specifying the BSS type and BSSID filters as well as a + * variable number/length of TLVs are sent in the command to firmware. + * + * Preparation also includes - + * - Setting command ID, and proper size + * - Ensuring correct endian-ness + */ +int mwifiex_cmd_802_11_scan(struct host_cmd_ds_command *cmd, void *data_buf) +{ + struct host_cmd_ds_802_11_scan *scan_cmd = &cmd->params.scan; + struct mwifiex_scan_cmd_config *scan_cfg; + + scan_cfg = (struct mwifiex_scan_cmd_config *) data_buf; + + /* Set fixed field variables in scan command */ + scan_cmd->bss_mode = scan_cfg->bss_mode; + memcpy(scan_cmd->bssid, scan_cfg->specific_bssid, + sizeof(scan_cmd->bssid)); + memcpy(scan_cmd->tlv_buffer, scan_cfg->tlv_buf, scan_cfg->tlv_buf_len); + + cmd->command = cpu_to_le16(HostCmd_CMD_802_11_SCAN); + + /* Size is equal to the sizeof(fixed portions) + the TLV len + header */ + cmd->size = cpu_to_le16((u16) (sizeof(scan_cmd->bss_mode) + + sizeof(scan_cmd->bssid) + + scan_cfg->tlv_buf_len + S_DS_GEN)); + + return 0; +} + +/* + * This function handles the command response of scan. + * + * The response buffer for the scan command has the following + * memory layout: + * + * .-------------------------------------------------------------. + * | Header (4 * sizeof(t_u16)): Standard command response hdr | + * .-------------------------------------------------------------. + * | BufSize (t_u16) : sizeof the BSS Description data | + * .-------------------------------------------------------------. + * | NumOfSet (t_u8) : Number of BSS Descs returned | + * .-------------------------------------------------------------. + * | BSSDescription data (variable, size given in BufSize) | + * .-------------------------------------------------------------. + * | TLV data (variable, size calculated using Header->Size, | + * | BufSize and sizeof the fixed fields above) | + * .-------------------------------------------------------------. + */ +int mwifiex_ret_802_11_scan(struct mwifiex_private *priv, + struct host_cmd_ds_command *resp) +{ + int ret = 0; + struct mwifiex_adapter *adapter = priv->adapter; + struct cmd_ctrl_node *cmd_node; + struct host_cmd_ds_802_11_scan_rsp *scan_rsp; + struct mwifiex_bssdescriptor *bss_new_entry = NULL; + struct mwifiex_ie_types_data *tlv_data; + struct mwifiex_ie_types_tsf_timestamp *tsf_tlv; + u8 *bss_info; + u32 scan_resp_size; + u32 bytes_left; + u32 num_in_table; + u32 bss_idx; + u32 idx; + u32 tlv_buf_size; + long long tsf_val; + struct mwifiex_chan_freq_power *cfp; + struct mwifiex_ie_types_chan_band_list_param_set *chan_band_tlv; + struct chan_band_param_set *chan_band; + u8 band; + u8 is_bgscan_resp; + unsigned long flags; + + is_bgscan_resp = (le16_to_cpu(resp->command) + == HostCmd_CMD_802_11_BG_SCAN_QUERY); + if (is_bgscan_resp) + scan_rsp = &resp->params.bg_scan_query_resp.scan_resp; + else + scan_rsp = &resp->params.scan_resp; + + + if (scan_rsp->number_of_sets > IW_MAX_AP) { + dev_err(adapter->dev, "SCAN_RESP: too many AP returned (%d)\n", + scan_rsp->number_of_sets); + ret = -1; + goto done; + } + + bytes_left = le16_to_cpu(scan_rsp->bss_descript_size); + dev_dbg(adapter->dev, "info: SCAN_RESP: bss_descript_size %d\n", + bytes_left); + + scan_resp_size = le16_to_cpu(resp->size); + + dev_dbg(adapter->dev, + "info: SCAN_RESP: returned %d APs before parsing\n", + scan_rsp->number_of_sets); + + num_in_table = adapter->num_in_scan_table; + bss_info = scan_rsp->bss_desc_and_tlv_buffer; + + /* + * The size of the TLV buffer is equal to the entire command response + * size (scan_resp_size) minus the fixed fields (sizeof()'s), the + * BSS Descriptions (bss_descript_size as bytesLef) and the command + * response header (S_DS_GEN) + */ + tlv_buf_size = scan_resp_size - (bytes_left + + sizeof(scan_rsp->bss_descript_size) + + sizeof(scan_rsp->number_of_sets) + + S_DS_GEN); + + tlv_data = (struct mwifiex_ie_types_data *) (scan_rsp-> + bss_desc_and_tlv_buffer + + bytes_left); + + /* Search the TLV buffer space in the scan response for any valid + TLVs */ + mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size, + TLV_TYPE_TSFTIMESTAMP, + (struct mwifiex_ie_types_data **) + &tsf_tlv); + + /* Search the TLV buffer space in the scan response for any valid + TLVs */ + mwifiex_ret_802_11_scan_get_tlv_ptrs(adapter, tlv_data, tlv_buf_size, + TLV_TYPE_CHANNELBANDLIST, + (struct mwifiex_ie_types_data **) + &chan_band_tlv); + + /* + * Process each scan response returned (scan_rsp->number_of_sets). + * Save the information in the bss_new_entry and then insert into the + * driver scan table either as an update to an existing entry + * or as an addition at the end of the table + */ + bss_new_entry = kzalloc(sizeof(struct mwifiex_bssdescriptor), + GFP_KERNEL); + if (!bss_new_entry) { + dev_err(adapter->dev, " failed to alloc bss_new_entry\n"); + return -ENOMEM; + } + + for (idx = 0; idx < scan_rsp->number_of_sets && bytes_left; idx++) { + /* Zero out the bss_new_entry we are about to store info in */ + memset(bss_new_entry, 0x00, + sizeof(struct mwifiex_bssdescriptor)); + + if (mwifiex_interpret_bss_desc_with_ie(adapter, bss_new_entry, + &bss_info, + &bytes_left)) { + /* Error parsing/interpreting scan response, skipped */ + dev_err(adapter->dev, "SCAN_RESP: " + "mwifiex_interpret_bss_desc_with_ie " + "returned ERROR\n"); + continue; + } + + /* Process the data fields and IEs returned for this BSS */ + dev_dbg(adapter->dev, "info: SCAN_RESP: BSSID = %pM\n", + bss_new_entry->mac_address); + + /* Search the scan table for the same bssid */ + for (bss_idx = 0; bss_idx < num_in_table; bss_idx++) { + if (memcmp(bss_new_entry->mac_address, + adapter->scan_table[bss_idx].mac_address, + sizeof(bss_new_entry->mac_address))) { + continue; + } + /* + * If the SSID matches as well, it is a + * duplicate of this entry. Keep the bss_idx + * set to this entry so we replace the old + * contents in the table + */ + if ((bss_new_entry->ssid.ssid_len + == adapter->scan_table[bss_idx]. ssid.ssid_len) + && (!memcmp(bss_new_entry->ssid.ssid, + adapter->scan_table[bss_idx].ssid.ssid, + bss_new_entry->ssid.ssid_len))) { + dev_dbg(adapter->dev, "info: SCAN_RESP:" + " duplicate of index: %d\n", bss_idx); + break; + } + } + /* + * If the bss_idx is equal to the number of entries in + * the table, the new entry was not a duplicate; append + * it to the scan table + */ + if (bss_idx == num_in_table) { + /* Range check the bss_idx, keep it limited to + the last entry */ + if (bss_idx == IW_MAX_AP) + bss_idx--; + else + num_in_table++; + } + + /* + * Save the beacon/probe response returned for later application + * retrieval. Duplicate beacon/probe responses are updated if + * possible + */ + mwifiex_ret_802_11_scan_store_beacon(priv, bss_idx, + num_in_table, bss_new_entry); + /* + * If the TSF TLV was appended to the scan results, save this + * entry's TSF value in the networkTSF field.The networkTSF is + * the firmware's TSF value at the time the beacon or probe + * response was received. + */ + if (tsf_tlv) { + memcpy(&tsf_val, &tsf_tlv->tsf_data[idx * TSF_DATA_SIZE] + , sizeof(tsf_val)); + memcpy(&bss_new_entry->network_tsf, &tsf_val, + sizeof(bss_new_entry->network_tsf)); + } + band = BAND_G; + if (chan_band_tlv) { + chan_band = &chan_band_tlv->chan_band_param[idx]; + band = mwifiex_radio_type_to_band(chan_band->radio_type + & (BIT(0) | BIT(1))); + } + + /* Save the band designation for this entry for use in join */ + bss_new_entry->bss_band = band; + cfp = mwifiex_get_cfp_by_band_and_channel_from_cfg80211(priv, + (u8) bss_new_entry->bss_band, + (u16)bss_new_entry->channel); + + if (cfp) + bss_new_entry->freq = cfp->freq; + else + bss_new_entry->freq = 0; + + /* Copy the locally created bss_new_entry to the scan table */ + memcpy(&adapter->scan_table[bss_idx], bss_new_entry, + sizeof(adapter->scan_table[bss_idx])); + + } + + dev_dbg(adapter->dev, + "info: SCAN_RESP: Scanned %2d APs, %d valid, %d total\n", + scan_rsp->number_of_sets, + num_in_table - adapter->num_in_scan_table, num_in_table); + + /* Update the total number of BSSIDs in the scan table */ + adapter->num_in_scan_table = num_in_table; + + spin_lock_irqsave(&adapter->scan_pending_q_lock, flags); + if (list_empty(&adapter->scan_pending_q)) { + spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags); + spin_lock_irqsave(&adapter->mwifiex_cmd_lock, flags); + adapter->scan_processing = false; + spin_unlock_irqrestore(&adapter->mwifiex_cmd_lock, flags); + /* + * Process the resulting scan table: + * - Remove any bad ssids + * - Update our current BSS information from scan data + */ + mwifiex_process_scan_results(priv); + + /* Need to indicate IOCTL complete */ + if (adapter->curr_cmd->wait_q_enabled) { + adapter->cmd_wait_q.status = 0; + mwifiex_complete_cmd(adapter); + } + if (priv->report_scan_result) + priv->report_scan_result = false; + if (priv->scan_pending_on_block) { + priv->scan_pending_on_block = false; + up(&priv->async_sem); + } + + } else { + /* Get scan command from scan_pending_q and put to + cmd_pending_q */ + cmd_node = list_first_entry(&adapter->scan_pending_q, + struct cmd_ctrl_node, list); + list_del(&cmd_node->list); + spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags); + + mwifiex_insert_cmd_to_pending_q(adapter, cmd_node, true); + } + +done: + kfree((u8 *) bss_new_entry); + return ret; +} + +/* + * This function prepares command for background scan query. + * + * Preparation includes - + * - Setting command ID and proper size + * - Setting background scan flush parameter + * - Ensuring correct endian-ness + */ +int mwifiex_cmd_802_11_bg_scan_query(struct host_cmd_ds_command *cmd) +{ + struct host_cmd_ds_802_11_bg_scan_query *bg_query = + &cmd->params.bg_scan_query; + + cmd->command = cpu_to_le16(HostCmd_CMD_802_11_BG_SCAN_QUERY); + cmd->size = cpu_to_le16(sizeof(struct host_cmd_ds_802_11_bg_scan_query) + + S_DS_GEN); + + bg_query->flush = 1; + + return 0; +} + +/* + * This function finds a SSID in the scan table. + * + * A BSSID may optionally be provided to qualify the SSID. + * For non-Auto mode, further check is made to make sure the + * BSS found in the scan table is compatible with the current + * settings of the driver. + */ +s32 +mwifiex_find_ssid_in_list(struct mwifiex_private *priv, + struct mwifiex_802_11_ssid *ssid, u8 *bssid, + u32 mode) +{ + struct mwifiex_adapter *adapter = priv->adapter; + s32 net = -1, j; + u8 best_rssi = 0; + u32 i; + + dev_dbg(adapter->dev, "info: num of entries in table = %d\n", + adapter->num_in_scan_table); + + /* + * Loop through the table until the maximum is reached or until a match + * is found based on the bssid field comparison + */ + for (i = 0; + i < adapter->num_in_scan_table && (!bssid || (bssid && net < 0)); + i++) { + if (!mwifiex_ssid_cmp(&adapter->scan_table[i].ssid, ssid) && + (!bssid + || !memcmp(adapter->scan_table[i].mac_address, bssid, + ETH_ALEN)) + && + (mwifiex_get_cfp_by_band_and_channel_from_cfg80211 + (priv, (u8) adapter->scan_table[i].bss_band, + (u16) adapter->scan_table[i].channel))) { + switch (mode) { + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_ADHOC: + j = mwifiex_is_network_compatible(priv, i, + mode); + + if (j >= 0) { + if (SCAN_RSSI + (adapter->scan_table[i].rssi) > + best_rssi) { + best_rssi = SCAN_RSSI(adapter-> + scan_table + [i].rssi); + net = i; + } + } else { + if (net == -1) + net = j; + } + break; + case NL80211_IFTYPE_UNSPECIFIED: + default: + /* + * Do not check compatibility if the mode + * requested is Auto/Unknown. Allows generic + * find to work without verifying against the + * Adapter security settings + */ + if (SCAN_RSSI(adapter->scan_table[i].rssi) > + best_rssi) { + best_rssi = SCAN_RSSI(adapter-> + scan_table[i].rssi); + net = i; + } + break; + } + } + } + + return net; +} + +/* + * This function finds a specific compatible BSSID in the scan list. + * + * This function loops through the scan table looking for a compatible + * match. If a BSSID matches, but the BSS is found to be not compatible + * the function ignores it and continues to search through the rest of + * the entries in case there is an AP with multiple SSIDs assigned to + * the same BSSID. + */ +s32 +mwifiex_find_bssid_in_list(struct mwifiex_private *priv, u8 *bssid, + u32 mode) +{ + struct mwifiex_adapter *adapter = priv->adapter; + s32 net = -1; + u32 i; + + if (!bssid) + return -1; + + dev_dbg(adapter->dev, "info: FindBSSID: Num of BSSIDs = %d\n", + adapter->num_in_scan_table); + + /* + * Look through the scan table for a compatible match. The ret return + * variable will be equal to the index in the scan table (greater + * than zero) if the network is compatible. The loop will continue + * past a matched bssid that is not compatible in case there is an + * AP with multiple SSIDs assigned to the same BSSID + */ + for (i = 0; net < 0 && i < adapter->num_in_scan_table; i++) { + if (!memcmp + (adapter->scan_table[i].mac_address, bssid, ETH_ALEN) + && mwifiex_get_cfp_by_band_and_channel_from_cfg80211 + (priv, + (u8) adapter-> + scan_table[i]. + bss_band, + (u16) adapter-> + scan_table[i]. + channel)) { + switch (mode) { + case NL80211_IFTYPE_STATION: + case NL80211_IFTYPE_ADHOC: + net = mwifiex_is_network_compatible(priv, i, + mode); + break; + default: + net = i; + break; + } + } + } + + return net; +} + +/* + * This function inserts scan command node to the scan pending queue. + */ +void +mwifiex_queue_scan_cmd(struct mwifiex_private *priv, + struct cmd_ctrl_node *cmd_node) +{ + struct mwifiex_adapter *adapter = priv->adapter; + unsigned long flags; + + cmd_node->wait_q_enabled = true; + spin_lock_irqsave(&adapter->scan_pending_q_lock, flags); + list_add_tail(&cmd_node->list, &adapter->scan_pending_q); + spin_unlock_irqrestore(&adapter->scan_pending_q_lock, flags); +} + +/* + * This function finds an AP with specific ssid in the scan list. + */ +int mwifiex_find_best_network(struct mwifiex_private *priv, + struct mwifiex_ssid_bssid *req_ssid_bssid) +{ + struct mwifiex_adapter *adapter = priv->adapter; + struct mwifiex_bssdescriptor *req_bss; + s32 i; + + memset(req_ssid_bssid, 0, sizeof(struct mwifiex_ssid_bssid)); + + i = mwifiex_find_best_network_in_list(priv); + + if (i >= 0) { + req_bss = &adapter->scan_table[i]; + memcpy(&req_ssid_bssid->ssid, &req_bss->ssid, + sizeof(struct mwifiex_802_11_ssid)); + memcpy((u8 *) &req_ssid_bssid->bssid, + (u8 *) &req_bss->mac_address, ETH_ALEN); + + /* Make sure we are in the right mode */ + if (priv->bss_mode == NL80211_IFTYPE_UNSPECIFIED) + priv->bss_mode = req_bss->bss_mode; + } + + if (!req_ssid_bssid->ssid.ssid_len) + return -1; + + dev_dbg(adapter->dev, "info: Best network found = [%s], " + "[%pM]\n", req_ssid_bssid->ssid.ssid, + req_ssid_bssid->bssid); + + return 0; +} + +/* + * This function sends a scan command for all available channels to the + * firmware, filtered on a specific SSID. + */ +static int mwifiex_scan_specific_ssid(struct mwifiex_private *priv, + struct mwifiex_802_11_ssid *req_ssid) +{ + struct mwifiex_adapter *adapter = priv->adapter; + int ret = 0; + struct mwifiex_user_scan_cfg *scan_cfg; + + if (!req_ssid) + return -1; + + if (adapter->scan_processing) { + dev_dbg(adapter->dev, "cmd: Scan already in process...\n"); + return ret; + } + + if (priv->scan_block) { + dev_dbg(adapter->dev, + "cmd: Scan is blocked during association...\n"); + return ret; + } + + mwifiex_scan_delete_ssid_table_entry(priv, req_ssid); + + scan_cfg = kzalloc(sizeof(struct mwifiex_user_scan_cfg), GFP_KERNEL); + if (!scan_cfg) { + dev_err(adapter->dev, "failed to alloc scan_cfg\n"); + return -ENOMEM; + } + + memcpy(scan_cfg->ssid_list[0].ssid, req_ssid->ssid, + req_ssid->ssid_len); + scan_cfg->keep_previous_scan = true; + + ret = mwifiex_scan_networks(priv, scan_cfg); + + kfree(scan_cfg); + return ret; +} + +/* + * Sends IOCTL request to start a scan. + * + * This function allocates the IOCTL request buffer, fills it + * with requisite parameters and calls the IOCTL handler. + * + * Scan command can be issued for both normal scan and specific SSID + * scan, depending upon whether an SSID is provided or not. + */ +int mwifiex_request_scan(struct mwifiex_private *priv, + struct mwifiex_802_11_ssid *req_ssid) +{ + int ret; + + if (down_interruptible(&priv->async_sem)) { + dev_err(priv->adapter->dev, "%s: acquire semaphore\n", + __func__); + return -1; + } + priv->scan_pending_on_block = true; + + priv->adapter->cmd_wait_q.condition = false; + + if (req_ssid && req_ssid->ssid_len != 0) + /* Specific SSID scan */ + ret = mwifiex_scan_specific_ssid(priv, req_ssid); + else + /* Normal scan */ + ret = mwifiex_scan_networks(priv, NULL); + + if (!ret) + ret = mwifiex_wait_queue_complete(priv->adapter); + + if (ret == -1) { + priv->scan_pending_on_block = false; + up(&priv->async_sem); + } + + return ret; +} + +/* + * This function appends the vendor specific IE TLV to a buffer. + */ +int +mwifiex_cmd_append_vsie_tlv(struct mwifiex_private *priv, + u16 vsie_mask, u8 **buffer) +{ + int id, ret_len = 0; + struct mwifiex_ie_types_vendor_param_set *vs_param_set; + + if (!buffer) + return 0; + if (!(*buffer)) + return 0; + + /* + * Traverse through the saved vendor specific IE array and append + * the selected(scan/assoc/adhoc) IE as TLV to the command + */ + for (id = 0; id < MWIFIEX_MAX_VSIE_NUM; id++) { + if (priv->vs_ie[id].mask & vsie_mask) { + vs_param_set = + (struct mwifiex_ie_types_vendor_param_set *) + *buffer; + vs_param_set->header.type = + cpu_to_le16(TLV_TYPE_PASSTHROUGH); + vs_param_set->header.len = + cpu_to_le16((((u16) priv->vs_ie[id].ie[1]) + & 0x00FF) + 2); + memcpy(vs_param_set->ie, priv->vs_ie[id].ie, + le16_to_cpu(vs_param_set->header.len)); + *buffer += le16_to_cpu(vs_param_set->header.len) + + sizeof(struct mwifiex_ie_types_header); + ret_len += le16_to_cpu(vs_param_set->header.len) + + sizeof(struct mwifiex_ie_types_header); + } + } + return ret_len; +} + +/* + * This function saves a beacon buffer of the current BSS descriptor. + * + * The current beacon buffer is saved so that it can be restored in the + * following cases that makes the beacon buffer not to contain the current + * ssid's beacon buffer. + * - The current ssid was not found somehow in the last scan. + * - The current ssid was the last entry of the scan table and overloaded. + */ +void +mwifiex_save_curr_bcn(struct mwifiex_private *priv) +{ + struct mwifiex_bssdescriptor *curr_bss = + &priv->curr_bss_params.bss_descriptor; + + if (!curr_bss->beacon_buf_size) + return; + + /* allocate beacon buffer at 1st time; or if it's size has changed */ + if (!priv->curr_bcn_buf || + priv->curr_bcn_size != curr_bss->beacon_buf_size) { + priv->curr_bcn_size = curr_bss->beacon_buf_size; + + kfree(priv->curr_bcn_buf); + priv->curr_bcn_buf = kzalloc(curr_bss->beacon_buf_size, + GFP_KERNEL); + if (!priv->curr_bcn_buf) { + dev_err(priv->adapter->dev, + "failed to alloc curr_bcn_buf\n"); + return; + } + } + + memcpy(priv->curr_bcn_buf, curr_bss->beacon_buf, + curr_bss->beacon_buf_size); + dev_dbg(priv->adapter->dev, "info: current beacon saved %d\n", + priv->curr_bcn_size); +} + +/* + * This function frees the current BSS descriptor beacon buffer. + */ +void +mwifiex_free_curr_bcn(struct mwifiex_private *priv) +{ + kfree(priv->curr_bcn_buf); + priv->curr_bcn_buf = NULL; +} |