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scan.c
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scan.c
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/*
* 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_DEF_CHANNELS_PER_SCAN_CMD 4
#define MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD 15
#define MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD 27
#define MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD 35
/* 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_VENDOR_SPECIFIC))) {
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 cfg80211_ssid *ssid1, struct cfg80211_ssid *ssid2)
{
if (!ssid1 || !ssid2 || (ssid1->ssid_len != ssid2->ssid_len))
return -1;
return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssid_len);
}
/*
* This function checks if wapi is enabled in driver and scanned network is
* compatible with it.
*/
static bool
mwifiex_is_bss_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_bss_no_sec(struct mwifiex_private *priv,
struct mwifiex_bssdescriptor *bss_desc)
{
if (!priv->sec_info.wep_enabled && !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_VENDOR_SPECIFIC)) &&
((!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_bss_static_wep(struct mwifiex_private *priv,
struct mwifiex_bssdescriptor *bss_desc)
{
if (priv->sec_info.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_bss_wpa(struct mwifiex_private *priv,
struct mwifiex_bssdescriptor *bss_desc)
{
if (!priv->sec_info.wep_enabled && 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_VENDOR_SPECIFIC))
/*
* Privacy bit may NOT be set in some APs like
* LinkSys WRT54G && bss_desc->privacy
*/
) {
dev_dbg(priv->adapter->dev, "info: %s: WPA:"
" wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
"EncMode=%#x privacy=%#x\n", __func__,
(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_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_bss_wpa2(struct mwifiex_private *priv,
struct mwifiex_bssdescriptor *bss_desc)
{
if (!priv->sec_info.wep_enabled &&
!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: "
" wpa_ie=%#x wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
"EncMode=%#x privacy=%#x\n", __func__,
(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_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_bss_adhoc_aes(struct mwifiex_private *priv,
struct mwifiex_bssdescriptor *bss_desc)
{
if (!priv->sec_info.wep_enabled && !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_VENDOR_SPECIFIC)) &&
((!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_bss_dynamic_wep(struct mwifiex_private *priv,
struct mwifiex_bssdescriptor *bss_desc)
{
if (!priv->sec_info.wep_enabled && !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_VENDOR_SPECIFIC)) &&
((!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: wpa_ie=%#x wpa2_ie=%#x "
"EncMode=%#x privacy=%#x\n",
__func__,
(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,
struct mwifiex_bssdescriptor *bss_desc, u32 mode)
{
struct mwifiex_adapter *adapter = priv->adapter;
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 0;
if (priv->wps.session_enable) {
dev_dbg(adapter->dev,
"info: return success directly in WPS period\n");
return 0;
}
if (mwifiex_is_bss_wapi(priv, bss_desc)) {
dev_dbg(adapter->dev, "info: return success for WAPI AP\n");
return 0;
}
if (bss_desc->bss_mode == mode) {
if (mwifiex_is_bss_no_sec(priv, bss_desc)) {
/* No security */
return 0;
} else if (mwifiex_is_bss_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 0;
} else if (mwifiex_is_bss_wpa(priv, bss_desc)) {
/* 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 0;
} else if (mwifiex_is_bss_wpa2(priv, bss_desc)) {
/* 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 0;
} else if (mwifiex_is_bss_adhoc_aes(priv, bss_desc)) {
/* Ad-hoc AES enabled */
return 0;
} else if (mwifiex_is_bss_dynamic_wep(priv, bss_desc)) {
/* Dynamic WEP enabled */
return 0;
}
/* Security doesn't match */
dev_dbg(adapter->dev,
"info: %s: failed: wpa_ie=%#x wpa2_ie=%#x WEP=%s "
"WPA=%s WPA2=%s EncMode=%#x privacy=%#x\n", __func__,
(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_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 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 int
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;
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++) {
ch = &sband->channels[i];
if (ch->flags & IEEE80211_CHAN_DISABLED)
continue;
scan_chan_list[chan_idx].radio_type = band;
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 (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
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 (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
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;
}
chan_idx++;
}
}
return chan_idx;
}
/*
* 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 */
le16_add_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_config_scan(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;
u8 *tlv_pos;
u32 num_probes;
u32 ssid_len;
u32 chan_idx;
u32 chan_num;
u32 scan_type;
u16 scan_dur;
u8 channel;
u8 radio_type;
int i;
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 (i = 0; i < user_scan_in->num_ssids; i++) {
ssid_len = user_scan_in->ssid_list[i].ssid_len;
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)));
/*
* max_ssid_length = 0 tells firmware to perform
* specific scan for the SSID filled, whereas
* max_ssid_length = IEEE80211_MAX_SSID_LEN is for
* wildcard scan.
*/
if (ssid_len)
wildcard_ssid_tlv->max_ssid_length = 0;
else
wildcard_ssid_tlv->max_ssid_length =
IEEE80211_MAX_SSID_LEN;
memcpy(wildcard_ssid_tlv->ssid,
user_scan_in->ssid_list[i].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[%d]: %s, %d\n",
i, 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 ((i && ssid_filter) ||
!is_zero_ether_addr(scan_cfg_out->specific_bssid))
*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_DEF_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 (*filtered_scan)
(scan_chan_list +
chan_idx)->chan_scan_mode_bitmap
|= MWIFIEX_DISABLE_CHAN_FILT;
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");
}
chan_num = chan_idx;
} else {
dev_dbg(adapter->dev,
"info: Scan: Creating full region channel list\n");
chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
scan_chan_list,
*filtered_scan);
}
/*
* In associated state we will reduce the number of channels scanned per
* scan command to avoid any traffic delay/loss. This number is decided
* based on total number of channels to be scanned due to constraints
* of command buffers.
*/
if (priv->media_connected) {
if (chan_num < MWIFIEX_LIMIT_1_CHANNEL_PER_SCAN_CMD)
*max_chan_per_scan = 1;
else if (chan_num < MWIFIEX_LIMIT_2_CHANNELS_PER_SCAN_CMD)
*max_chan_per_scan = 2;
else if (chan_num < MWIFIEX_LIMIT_3_CHANNELS_PER_SCAN_CMD)
*max_chan_per_scan = 3;
else
*max_chan_per_scan = 4;
}
}