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android_kernel_motorola_sm6225/drivers/net/wireless/libertas/scan.c
Dan Williams f8f551089b [PATCH] libertas: kill wlan_scan_process_results 
Fold into wlan_scan_networks() and protect with debug defines.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-06-28 07:48:47 -04:00

1895 lines
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/**
* Functions implementing wlan scan IOCTL and firmware command APIs
*
* IOCTL handlers as well as command preperation and response routines
* for sending scan commands to the firmware.
*/
#include <linux/ctype.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <linux/etherdevice.h>
#include <net/ieee80211.h>
#include <net/iw_handler.h>
#include "host.h"
#include "decl.h"
#include "dev.h"
#include "scan.h"
//! Approximate amount of data needed to pass a scan result back to iwlist
#define MAX_SCAN_CELL_SIZE (IW_EV_ADDR_LEN \
+ IW_ESSID_MAX_SIZE \
+ IW_EV_UINT_LEN \
+ IW_EV_FREQ_LEN \
+ IW_EV_QUAL_LEN \
+ IW_ESSID_MAX_SIZE \
+ IW_EV_PARAM_LEN \
+ 40) /* 40 for WPAIE */
//! Memory needed to store a max sized channel List TLV for a firmware scan
#define CHAN_TLV_MAX_SIZE (sizeof(struct mrvlietypesheader) \
+ (MRVDRV_MAX_CHANNELS_PER_SCAN \
* sizeof(struct chanscanparamset)))
//! Memory needed to store a max number/size SSID TLV for a firmware scan
#define SSID_TLV_MAX_SIZE (1 * sizeof(struct mrvlietypes_ssidparamset))
//! Maximum memory needed for a wlan_scan_cmd_config with all TLVs at max
#define MAX_SCAN_CFG_ALLOC (sizeof(struct wlan_scan_cmd_config) \
+ sizeof(struct mrvlietypes_numprobes) \
+ CHAN_TLV_MAX_SIZE \
+ SSID_TLV_MAX_SIZE)
//! The maximum number of channels the firmware can scan per command
#define MRVDRV_MAX_CHANNELS_PER_SCAN 14
/**
* @brief Number of channels to scan per firmware scan command issuance.
*
* Number restricted to prevent hitting the limit on the amount of scan data
* returned in a single firmware scan command.
*/
#define MRVDRV_CHANNELS_PER_SCAN_CMD 4
//! Scan time specified in the channel TLV for each channel for passive scans
#define MRVDRV_PASSIVE_SCAN_CHAN_TIME 100
//! Scan time specified in the channel TLV for each channel for active scans
#define MRVDRV_ACTIVE_SCAN_CHAN_TIME 100
static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
static inline void clear_bss_descriptor (struct bss_descriptor * bss)
{
/* Don't blow away ->list, just BSS data */
memset(bss, 0, offsetof(struct bss_descriptor, list));
}
static inline int match_bss_no_security(struct wlan_802_11_security * secinfo,
struct bss_descriptor * match_bss)
{
if ( !secinfo->wep_enabled
&& !secinfo->WPAenabled
&& !secinfo->WPA2enabled
&& match_bss->wpa_ie[0] != WPA_IE
&& match_bss->rsn_ie[0] != WPA2_IE
&& !match_bss->privacy) {
return 1;
}
return 0;
}
static inline int match_bss_static_wep(struct wlan_802_11_security * secinfo,
struct bss_descriptor * match_bss)
{
if ( secinfo->wep_enabled
&& !secinfo->WPAenabled
&& !secinfo->WPA2enabled
&& match_bss->privacy) {
return 1;
}
return 0;
}
static inline int match_bss_wpa(struct wlan_802_11_security * secinfo,
struct bss_descriptor * match_bss)
{
if ( !secinfo->wep_enabled
&& secinfo->WPAenabled
&& (match_bss->wpa_ie[0] == WPA_IE)
/* privacy bit may NOT be set in some APs like LinkSys WRT54G
&& bss->privacy */
) {
return 1;
}
return 0;
}
static inline int match_bss_wpa2(struct wlan_802_11_security * secinfo,
struct bss_descriptor * match_bss)
{
if ( !secinfo->wep_enabled
&& secinfo->WPA2enabled
&& (match_bss->rsn_ie[0] == WPA2_IE)
/* privacy bit may NOT be set in some APs like LinkSys WRT54G
&& bss->privacy */
) {
return 1;
}
return 0;
}
static inline int match_bss_dynamic_wep(struct wlan_802_11_security * secinfo,
struct bss_descriptor * match_bss)
{
if ( !secinfo->wep_enabled
&& !secinfo->WPAenabled
&& !secinfo->WPA2enabled
&& (match_bss->wpa_ie[0] != WPA_IE)
&& (match_bss->rsn_ie[0] != WPA2_IE)
&& match_bss->privacy) {
return 1;
}
return 0;
}
/**
* @brief Check if a scanned network 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
* 1 0 0 0 NONE 1 0 0 yes Static WEP
* 0 1 0 0 x 1x 1 x yes WPA
* 0 0 1 0 x 1x x 1 yes WPA2
* 0 0 0 1 NONE 1 0 0 yes Ad-hoc AES
* 0 0 0 0 !=NONE 1 0 0 yes Dynamic WEP
*
*
* @param adapter A pointer to wlan_adapter
* @param index Index in scantable to check against current driver settings
* @param mode Network mode: Infrastructure or IBSS
*
* @return Index in scantable, or error code if negative
*/
static int is_network_compatible(wlan_adapter * adapter,
struct bss_descriptor * bss, u8 mode)
{
int matched = 0;
lbs_deb_enter(LBS_DEB_ASSOC);
if (bss->mode != mode)
goto done;
if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
goto done;
} else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
goto done;
} else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
lbs_deb_scan(
"is_network_compatible() WPA: wpa_ie=%#x "
"wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
"privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
adapter->secinfo.wep_enabled ? "e" : "d",
adapter->secinfo.WPAenabled ? "e" : "d",
adapter->secinfo.WPA2enabled ? "e" : "d",
bss->privacy);
goto done;
} else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
lbs_deb_scan(
"is_network_compatible() WPA2: wpa_ie=%#x "
"wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
"privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
adapter->secinfo.wep_enabled ? "e" : "d",
adapter->secinfo.WPAenabled ? "e" : "d",
adapter->secinfo.WPA2enabled ? "e" : "d",
bss->privacy);
goto done;
} else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
lbs_deb_scan(
"is_network_compatible() dynamic WEP: "
"wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
bss->wpa_ie[0],
bss->rsn_ie[0],
bss->privacy);
goto done;
}
/* bss security settings don't match those configured on card */
lbs_deb_scan(
"is_network_compatible() FAILED: wpa_ie=%#x "
"wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
bss->wpa_ie[0], bss->rsn_ie[0],
adapter->secinfo.wep_enabled ? "e" : "d",
adapter->secinfo.WPAenabled ? "e" : "d",
adapter->secinfo.WPA2enabled ? "e" : "d",
bss->privacy);
done:
lbs_deb_leave(LBS_DEB_SCAN);
return matched;
}
/**
* @brief Create a channel list for the driver to scan based on region info
*
* Use the driver region/band information to construct a comprehensive list
* of channels to scan. This routine is used for any scan that is not
* provided a specific channel list to scan.
*
* @param priv A pointer to wlan_private structure
* @param scanchanlist Output parameter: resulting channel list to scan
* @param filteredscan Flag indicating whether or not a BSSID or SSID filter
* is being sent in the command to firmware. Used to
* increase the number of channels sent in a scan
* command and to disable the firmware channel scan
* filter.
*
* @return void
*/
static void wlan_scan_create_channel_list(wlan_private * priv,
struct chanscanparamset * scanchanlist,
u8 filteredscan)
{
wlan_adapter *adapter = priv->adapter;
struct region_channel *scanregion;
struct chan_freq_power *cfp;
int rgnidx;
int chanidx;
int nextchan;
u8 scantype;
chanidx = 0;
/* Set the default scan type to the user specified type, will later
* be changed to passive on a per channel basis if restricted by
* regulatory requirements (11d or 11h)
*/
scantype = adapter->scantype;
for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
if (priv->adapter->enable11d &&
adapter->connect_status != libertas_connected) {
/* Scan all the supported chan for the first scan */
if (!adapter->universal_channel[rgnidx].valid)
continue;
scanregion = &adapter->universal_channel[rgnidx];
/* clear the parsed_region_chan for the first scan */
memset(&adapter->parsed_region_chan, 0x00,
sizeof(adapter->parsed_region_chan));
} else {
if (!adapter->region_channel[rgnidx].valid)
continue;
scanregion = &adapter->region_channel[rgnidx];
}
for (nextchan = 0;
nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
cfp = scanregion->CFP + nextchan;
if (priv->adapter->enable11d) {
scantype =
libertas_get_scan_type_11d(cfp->channel,
&adapter->
parsed_region_chan);
}
switch (scanregion->band) {
case BAND_B:
case BAND_G:
default:
scanchanlist[chanidx].radiotype =
cmd_scan_radio_type_bg;
break;
}
if (scantype == cmd_scan_type_passive) {
scanchanlist[chanidx].maxscantime =
cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
scanchanlist[chanidx].chanscanmode.passivescan =
1;
} else {
scanchanlist[chanidx].maxscantime =
cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
scanchanlist[chanidx].chanscanmode.passivescan =
0;
}
scanchanlist[chanidx].channumber = cfp->channel;
if (filteredscan) {
scanchanlist[chanidx].chanscanmode.
disablechanfilt = 1;
}
}
}
}
/**
* @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
*
* Application layer or other functions can invoke wlan_scan_networks
* with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
* This structure is used as the basis of one or many wlan_scan_cmd_config
* commands that are sent to the command processing module and sent to
* firmware.
*
* Create a wlan_scan_cmd_config 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, disable/clear the filter.
* If the number of probes is not set, use the adapter default setting
* Qualify the channel
*
* @param priv A pointer to wlan_private structure
* @param puserscanin NULL or pointer to scan configuration parameters
* @param ppchantlvout Output parameter: Pointer to the start of the
* channel TLV portion of the output scan config
* @param pscanchanlist Output parameter: Pointer to the resulting channel
* list to scan
* @param pmaxchanperscan Output parameter: Number of channels to scan for
* each issuance of the firmware scan command
* @param pfilteredscan Output parameter: Flag indicating whether or not
* a BSSID or SSID filter is being sent in the
* command to firmware. Used to increase the number
* of channels sent in a scan command and to
* disable the firmware channel scan filter.
* @param pscancurrentonly Output parameter: Flag indicating whether or not
* we are only scanning our current active channel
*
* @return resulting scan configuration
*/
static struct wlan_scan_cmd_config *
wlan_scan_setup_scan_config(wlan_private * priv,
const struct wlan_ioctl_user_scan_cfg * puserscanin,
struct mrvlietypes_chanlistparamset ** ppchantlvout,
struct chanscanparamset * pscanchanlist,
int *pmaxchanperscan,
u8 * pfilteredscan,
u8 * pscancurrentonly)
{
wlan_adapter *adapter = priv->adapter;
struct mrvlietypes_numprobes *pnumprobestlv;
struct mrvlietypes_ssidparamset *pssidtlv;
struct wlan_scan_cmd_config * pscancfgout = NULL;
u8 *ptlvpos;
u16 numprobes;
int chanidx;
int scantype;
int scandur;
int channel;
int radiotype;
pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
if (pscancfgout == NULL)
goto out;
/* The tlvbufferlen 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 *ppchantlvout. The difference
* between the *ppchantlvout and the tlvbuffer start will be used
* to calculate the size of anything we add in this routine.
*/
pscancfgout->tlvbufferlen = 0;
/* Running tlv pointer. Assigned to ppchantlvout at end of function
* so later routines know where channels can be added to the command buf
*/
ptlvpos = pscancfgout->tlvbuffer;
/*
* Set the initial scan paramters for progressive scanning. If a specific
* BSSID or SSID is used, the number of channels in the scan command
* will be increased to the absolute maximum
*/
*pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
/* Initialize the scan as un-filtered by firmware, set to TRUE below if
* a SSID or BSSID filter is sent in the command
*/
*pfilteredscan = 0;
/* 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.
*/
*pscancurrentonly = 0;
if (puserscanin) {
/* Set the bss type scan filter, use adapter setting if unset */
pscancfgout->bsstype =
(puserscanin->bsstype ? puserscanin->bsstype : adapter->
scanmode);
/* Set the number of probes to send, use adapter setting if unset */
numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
adapter->scanprobes);
/*
* Set the BSSID filter to the incoming configuration,
* if non-zero. If not set, it will remain disabled (all zeros).
*/
memcpy(pscancfgout->bssid, puserscanin->bssid,
sizeof(pscancfgout->bssid));
if (puserscanin->ssid_len) {
pssidtlv =
(struct mrvlietypes_ssidparamset *) pscancfgout->
tlvbuffer;
pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
memcpy(pssidtlv->ssid, puserscanin->ssid,
puserscanin->ssid_len);
ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
}
/*
* 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 ( puserscanin->ssid_len
|| (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
*pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
*pfilteredscan = 1;
}
} else {
pscancfgout->bsstype = adapter->scanmode;
numprobes = adapter->scanprobes;
}
/* If the input config or adapter has the number of Probes set, add tlv */
if (numprobes) {
pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
pnumprobestlv->header.len = cpu_to_le16(2);
pnumprobestlv->numprobes = cpu_to_le16(numprobes);
ptlvpos += sizeof(*pnumprobestlv);
}
/*
* Set the output for the channel TLV to the address in the tlv buffer
* past any TLVs that were added in this fuction (SSID, numprobes).
* channel TLVs will be added past this for each scan command, preserving
* the TLVs that were previously added.
*/
*ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
if (puserscanin && puserscanin->chanlist[0].channumber) {
lbs_deb_scan("Scan: Using supplied channel list\n");
for (chanidx = 0;
chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
&& puserscanin->chanlist[chanidx].channumber; chanidx++) {
channel = puserscanin->chanlist[chanidx].channumber;
(pscanchanlist + chanidx)->channumber = channel;
radiotype = puserscanin->chanlist[chanidx].radiotype;
(pscanchanlist + chanidx)->radiotype = radiotype;
scantype = puserscanin->chanlist[chanidx].scantype;
if (scantype == cmd_scan_type_passive) {
(pscanchanlist +
chanidx)->chanscanmode.passivescan = 1;
} else {
(pscanchanlist +
chanidx)->chanscanmode.passivescan = 0;
}
if (puserscanin->chanlist[chanidx].scantime) {
scandur =
puserscanin->chanlist[chanidx].scantime;
} else {
if (scantype == cmd_scan_type_passive) {
scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
} else {
scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
}
}
(pscanchanlist + chanidx)->minscantime =
cpu_to_le16(scandur);
(pscanchanlist + chanidx)->maxscantime =
cpu_to_le16(scandur);
}
/* Check if we are only scanning the current channel */
if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
==
priv->adapter->curbssparams.channel)) {
*pscancurrentonly = 1;
lbs_deb_scan("Scan: Scanning current channel only");
}
} else {
lbs_deb_scan("Scan: Creating full region channel list\n");
wlan_scan_create_channel_list(priv, pscanchanlist,
*pfilteredscan);
}
out:
return pscancfgout;
}
/**
* @brief Construct and send multiple scan config commands to the firmware
*
* Previous routines have created a wlan_scan_cmd_config with any requested
* TLVs. This function splits the channel TLV into maxchanperscan lists
* and sends the portion of the channel TLV along with the other TLVs
* to the wlan_cmd routines for execution in the firmware.
*
* @param priv A pointer to wlan_private structure
* @param maxchanperscan Maximum number channels to be included in each
* scan command sent to firmware
* @param filteredscan Flag indicating whether or not a BSSID or SSID
* filter is being used for the firmware command
* scan command sent to firmware
* @param pscancfgout Scan configuration used for this scan.
* @param pchantlvout Pointer in the pscancfgout where the channel TLV
* should start. This is past any other TLVs that
* must be sent down in each firmware command.
* @param pscanchanlist List of channels to scan in maxchanperscan segments
*
* @return 0 or error return otherwise
*/
static int wlan_scan_channel_list(wlan_private * priv,
int maxchanperscan,
u8 filteredscan,
struct wlan_scan_cmd_config * pscancfgout,
struct mrvlietypes_chanlistparamset * pchantlvout,
struct chanscanparamset * pscanchanlist,
const struct wlan_ioctl_user_scan_cfg * puserscanin,
int full_scan)
{
struct chanscanparamset *ptmpchan;
struct chanscanparamset *pstartchan;
u8 scanband;
int doneearly;
int tlvidx;
int ret = 0;
int scanned = 0;
union iwreq_data wrqu;
lbs_deb_enter(LBS_DEB_ASSOC);
if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
pscancfgout, pchantlvout, pscanchanlist);
return -1;
}
pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
/* Set the temp channel struct pointer to the start of the desired list */
ptmpchan = pscanchanlist;
if (priv->adapter->last_scanned_channel && !puserscanin)
ptmpchan += priv->adapter->last_scanned_channel;
/* Loop through the desired channel list, sending a new firmware scan
* commands for each maxchanperscan channels (or for 1,6,11 individually
* if configured accordingly)
*/
while (ptmpchan->channumber) {
tlvidx = 0;
pchantlvout->header.len = 0;
scanband = ptmpchan->radiotype;
pstartchan = ptmpchan;
doneearly = 0;
/* Construct the channel TLV for the scan command. Continue to
* insert channel TLVs until:
* - the tlvidx hits the maximum configured per scan command
* - the next channel to insert is 0 (end of desired channel list)
* - doneearly is set (controlling individual scanning of 1,6,11)
*/
while (tlvidx < maxchanperscan && ptmpchan->channumber
&& !doneearly && scanned < 2) {
lbs_deb_scan(
"Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
ptmpchan->channumber, ptmpchan->radiotype,
ptmpchan->chanscanmode.passivescan,
ptmpchan->chanscanmode.disablechanfilt,
ptmpchan->maxscantime);
/* Copy the current channel TLV to the command being prepared */
memcpy(pchantlvout->chanscanparam + tlvidx,
ptmpchan, sizeof(pchantlvout->chanscanparam));
/* Increment the TLV header length by the size appended */
/* Ew, it would be _so_ nice if we could just declare the
variable little-endian and let GCC handle it for us */
pchantlvout->header.len =
cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
sizeof(pchantlvout->chanscanparam));
/*
* 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.
*/
pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
- pscancfgout->tlvbuffer);
/* Add the size of the channel tlv header and the data length */
pscancfgout->tlvbufferlen +=
(sizeof(pchantlvout->header)
+ le16_to_cpu(pchantlvout->header.len));
/* Increment the index to the channel tlv we are constructing */
tlvidx++;
doneearly = 0;
/* 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 (!filteredscan && (ptmpchan->channumber == 1
|| ptmpchan->channumber == 6
|| ptmpchan->channumber == 11)) {
doneearly = 1;
}
/* Increment the tmp pointer to the next channel to be scanned */
ptmpchan++;
scanned++;
/* 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 (!filteredscan && (ptmpchan->channumber == 1
|| ptmpchan->channumber == 6
|| ptmpchan->channumber == 11)) {
doneearly = 1;
}
}
/* Send the scan command to the firmware with the specified cfg */
ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
0, 0, pscancfgout);
if (scanned >= 2 && !full_scan) {
ret = 0;
goto done;
}
scanned = 0;
}
done:
priv->adapter->last_scanned_channel = ptmpchan->channumber;
/* Tell userspace the scan table has been updated */
memset(&wrqu, 0, sizeof(union iwreq_data));
wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
return ret;
}
static void
clear_selected_scan_list_entries(wlan_adapter * adapter,
const struct wlan_ioctl_user_scan_cfg * scan_cfg)
{
struct bss_descriptor * bss;
struct bss_descriptor * safe;
u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
if (!scan_cfg)
return;
if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
clear_ssid_flag = 1;
if (scan_cfg->clear_bssid
&& (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
&& (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
clear_bssid_flag = 1;
}
if (!clear_ssid_flag && !clear_bssid_flag)
return;
mutex_lock(&adapter->lock);
list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
u32 clear = 0;
/* Check for an SSID match */
if ( clear_ssid_flag
&& (bss->ssid_len == scan_cfg->ssid_len)
&& !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
clear = 1;
/* Check for a BSSID match */
if ( clear_bssid_flag
&& !compare_ether_addr(bss->bssid, scan_cfg->bssid))
clear = 1;
if (clear) {
list_move_tail (&bss->list, &adapter->network_free_list);
clear_bss_descriptor(bss);
}
}
mutex_unlock(&adapter->lock);
}
/**
* @brief Internal function used to start a scan based on an input config
*
* Use 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
*
* @param priv A pointer to wlan_private structure
* @param puserscanin Pointer to the input configuration for the requested
* scan.
*
* @return 0 or < 0 if error
*/
int wlan_scan_networks(wlan_private * priv,
const struct wlan_ioctl_user_scan_cfg * puserscanin,
int full_scan)
{
wlan_adapter * adapter = priv->adapter;
struct mrvlietypes_chanlistparamset *pchantlvout;
struct chanscanparamset * scan_chan_list = NULL;
struct wlan_scan_cmd_config * scan_cfg = NULL;
u8 filteredscan;
u8 scancurrentchanonly;
int maxchanperscan;
int ret;
#ifdef CONFIG_LIBERTAS_DEBUG
struct bss_descriptor * iter_bss;
int i = 0;
#endif
lbs_deb_enter(LBS_DEB_ASSOC);
scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
if (scan_chan_list == NULL) {
ret = -ENOMEM;
goto out;
}
scan_cfg = wlan_scan_setup_scan_config(priv,
puserscanin,
&pchantlvout,
scan_chan_list,
&maxchanperscan,
&filteredscan,
&scancurrentchanonly);
if (scan_cfg == NULL) {
ret = -ENOMEM;
goto out;
}
clear_selected_scan_list_entries(adapter, puserscanin);
/* Keep the data path active if we are only scanning our current channel */
if (!scancurrentchanonly) {
netif_stop_queue(priv->dev);
netif_carrier_off(priv->dev);
netif_stop_queue(priv->mesh_dev);
netif_carrier_off(priv->mesh_dev);
}
ret = wlan_scan_channel_list(priv,
maxchanperscan,
filteredscan,
scan_cfg,
pchantlvout,
scan_chan_list,
puserscanin,
full_scan);
#ifdef CONFIG_LIBERTAS_DEBUG
/* Dump the scan table */
mutex_lock(&adapter->lock);
list_for_each_entry (iter_bss, &adapter->network_list, list) {
lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
escape_essid(iter_bss->ssid, iter_bss->ssid_len));
}
mutex_unlock(&adapter->lock);
#endif
if (priv->adapter->connect_status == libertas_connected) {
netif_carrier_on(priv->dev);
netif_wake_queue(priv->dev);
netif_carrier_on(priv->mesh_dev);
netif_wake_queue(priv->mesh_dev);
}
out:
if (scan_cfg)
kfree(scan_cfg);
if (scan_chan_list)
kfree(scan_chan_list);
lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
return ret;
}
/**
* @brief Inspect the scan response buffer for pointers to expected TLVs
*
* TLVs can be included at the end of the scan response BSS information.
* Parse the data in the buffer for pointers to TLVs that can potentially
* be passed back in the response
*
* @param ptlv Pointer to the start of the TLV buffer to parse
* @param tlvbufsize size of the TLV buffer
* @param ptsftlv Output parameter: Pointer to the TSF TLV if found
*
* @return void
*/
static
void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
int tlvbufsize,
struct mrvlietypes_tsftimestamp ** ptsftlv)
{
struct mrvlietypes_data *pcurrenttlv;
int tlvbufleft;
u16 tlvtype;
u16 tlvlen;
pcurrenttlv = ptlv;
tlvbufleft = tlvbufsize;
*ptsftlv = NULL;
lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
tlvtype = le16_to_cpu(pcurrenttlv->header.type);
tlvlen = le16_to_cpu(pcurrenttlv->header.len);
switch (tlvtype) {
case TLV_TYPE_TSFTIMESTAMP:
*ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
break;
default:
lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
tlvtype);
/* Give up, this seems corrupted */
return;
} /* switch */
tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
pcurrenttlv =
(struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
} /* while */
}
/**
* @brief Interpret a BSS scan response returned from the firmware
*
* Parse the various fixed fields and IEs passed back for a a BSS probe
* response or beacon from the scan command. Record information as needed
* in the scan table struct bss_descriptor for that entry.
*
* @param bss Output parameter: Pointer to the BSS Entry
*
* @return 0 or -1
*/
static int libertas_process_bss(struct bss_descriptor * bss,
u8 ** pbeaconinfo, int *bytesleft)
{
enum ieeetypes_elementid elemID;
struct ieeetypes_fhparamset *pFH;
struct ieeetypes_dsparamset *pDS;
struct ieeetypes_cfparamset *pCF;
struct ieeetypes_ibssparamset *pibss;
struct ieeetypes_capinfo *pcap;
struct WLAN_802_11_FIXED_IEs fixedie;
u8 *pcurrentptr;
u8 *pRate;
u8 elemlen;
u8 bytestocopy;
u8 ratesize;
u16 beaconsize;
u8 founddatarateie;
int bytesleftforcurrentbeacon;
int ret;
struct IE_WPA *pIe;
const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
struct ieeetypes_countryinfoset *pcountryinfo;
lbs_deb_enter(LBS_DEB_ASSOC);
founddatarateie = 0;
ratesize = 0;
beaconsize = 0;
if (*bytesleft >= sizeof(beaconsize)) {
/* Extract & convert beacon size from the command buffer */
beaconsize = le16_to_cpup((void *)*pbeaconinfo);
*bytesleft -= sizeof(beaconsize);
*pbeaconinfo += sizeof(beaconsize);
}
if (beaconsize == 0 || beaconsize > *bytesleft) {
*pbeaconinfo += *bytesleft;
*bytesleft = 0;
return -1;
}
/* Initialize the current working beacon pointer for this BSS iteration */
pcurrentptr = *pbeaconinfo;
/* Advance the return beacon pointer past the current beacon */
*pbeaconinfo += beaconsize;
*bytesleft -= beaconsize;
bytesleftforcurrentbeacon = beaconsize;
memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
pcurrentptr += ETH_ALEN;
bytesleftforcurrentbeacon -= ETH_ALEN;
if (bytesleftforcurrentbeacon < 12) {
lbs_deb_scan("process_bss: 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->rssi = *pcurrentptr;
lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
pcurrentptr += 1;
bytesleftforcurrentbeacon -= 1;
/* time stamp is 8 bytes long */
fixedie.timestamp = bss->timestamp = le64_to_cpup((void *)pcurrentptr);
pcurrentptr += 8;
bytesleftforcurrentbeacon -= 8;
/* beacon interval is 2 bytes long */
fixedie.beaconinterval = bss->beaconperiod = le16_to_cpup((void *)pcurrentptr);
pcurrentptr += 2;
bytesleftforcurrentbeacon -= 2;
/* capability information is 2 bytes long */
memcpy(&fixedie.capabilities, pcurrentptr, 2);
lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
fixedie.capabilities);
pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
pcurrentptr += 2;
bytesleftforcurrentbeacon -= 2;
/* rest of the current buffer are IE's */
lbs_deb_scan("process_bss: IE length for this AP = %d\n",
bytesleftforcurrentbeacon);
lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
bytesleftforcurrentbeacon);
if (pcap->privacy) {
lbs_deb_scan("process_bss: AP WEP enabled\n");
bss->privacy = wlan802_11privfilter8021xWEP;
} else {
bss->privacy = wlan802_11privfilteracceptall;
}
if (pcap->ibss == 1) {
bss->mode = IW_MODE_ADHOC;
} else {
bss->mode = IW_MODE_INFRA;
}
/* process variable IE */
while (bytesleftforcurrentbeacon >= 2) {
elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
elemlen = *((u8 *) pcurrentptr + 1);
if (bytesleftforcurrentbeacon < elemlen) {
lbs_deb_scan("process_bss: error in processing IE, "
"bytes left < IE length\n");
bytesleftforcurrentbeacon = 0;
continue;
}
switch (elemID) {
case SSID:
bss->ssid_len = elemlen;
memcpy(bss->ssid, (pcurrentptr + 2), elemlen);
lbs_deb_scan("ssid '%s', ssid length %u\n",
escape_essid(bss->ssid, bss->ssid_len),
bss->ssid_len);
break;
case SUPPORTED_RATES:
memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
elemlen);
ratesize = elemlen;
founddatarateie = 1;
break;
case EXTRA_IE:
lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
break;
case FH_PARAM_SET:
pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
memmove(&bss->phyparamset.fhparamset, pFH,
sizeof(struct ieeetypes_fhparamset));
#if 0 /* I think we can store these LE */
bss->phyparamset.fhparamset.dwelltime
= le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
#endif
break;
case DS_PARAM_SET:
pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
bss->channel = pDS->currentchan;
memcpy(&bss->phyparamset.dsparamset, pDS,
sizeof(struct ieeetypes_dsparamset));
break;
case CF_PARAM_SET:
pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
memcpy(&bss->ssparamset.cfparamset, pCF,
sizeof(struct ieeetypes_cfparamset));
break;
case IBSS_PARAM_SET:
pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
bss->atimwindow = le32_to_cpu(pibss->atimwindow);
memmove(&bss->ssparamset.ibssparamset, pibss,
sizeof(struct ieeetypes_ibssparamset));
#if 0
bss->ssparamset.ibssparamset.atimwindow
= le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
#endif
break;
/* Handle Country Info IE */
case COUNTRY_INFO:
pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
|| pcountryinfo->len > 254) {
lbs_deb_scan("process_bss: 11D- Err "
"CountryInfo len =%d min=%zd max=254\n",
pcountryinfo->len,
sizeof(pcountryinfo->countrycode));
ret = -1;
goto done;
}
memcpy(&bss->countryinfo,
pcountryinfo, pcountryinfo->len + 2);
lbs_dbg_hex("process_bss: 11D- CountryInfo:",
(u8 *) pcountryinfo,
(u32) (pcountryinfo->len + 2));
break;
case EXTENDED_SUPPORTED_RATES:
/*
* only process extended supported rate
* if data rate is already found.
* data rate IE should come before
* extended supported rate IE
*/
if (founddatarateie) {
if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
bytestocopy =
(WLAN_SUPPORTED_RATES - ratesize);
} else {
bytestocopy = elemlen;
}
pRate = (u8 *) bss->datarates;
pRate += ratesize;
memmove(pRate, (pcurrentptr + 2), bytestocopy);
pRate = (u8 *) bss->libertas_supported_rates;
pRate += ratesize;
memmove(pRate, (pcurrentptr + 2), bytestocopy);
}
break;
case VENDOR_SPECIFIC_221:
#define IE_ID_LEN_FIELDS_BYTES 2
pIe = (struct IE_WPA *)pcurrentptr;
if (memcmp(pIe->oui, oui01, sizeof(oui01)))
break;
bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
MAX_WPA_IE_LEN);
memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
break;
case WPA2_IE:
pIe = (struct IE_WPA *)pcurrentptr;
bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
MAX_WPA_IE_LEN);
memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
break;
case TIM:
break;
case CHALLENGE_TEXT:
break;
}
pcurrentptr += elemlen + 2;
/* need to account for IE ID and IE len */
bytesleftforcurrentbeacon -= (elemlen + 2);
} /* while (bytesleftforcurrentbeacon > 2) */
/* Timestamp */
bss->last_scanned = jiffies;
ret = 0;
done:
lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
return ret;
}
/**
* @brief Compare two SSIDs
*
* @param ssid1 A pointer to ssid to compare
* @param ssid2 A pointer to ssid to compare
*
* @return 0--ssid is same, otherwise is different
*/
int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
{
if (ssid1_len != ssid2_len)
return -1;
return memcmp(ssid1, ssid2, ssid1_len);
}
/**
* @brief This function finds a specific compatible BSSID in the scan list
*
* @param adapter A pointer to wlan_adapter
* @param bssid BSSID to find in the scan list
* @param mode Network mode: Infrastructure or IBSS
*
* @return index in BSSID list, or error return code (< 0)
*/
struct bss_descriptor * libertas_find_bssid_in_list(wlan_adapter * adapter,
u8 * bssid, u8 mode)
{
struct bss_descriptor * iter_bss;
struct bss_descriptor * found_bss = NULL;
if (!bssid)
return NULL;
lbs_dbg_hex("libertas_find_BSSID_in_list: looking for ",
bssid, ETH_ALEN);
/* Look through the scan table for a compatible match. 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
*/
mutex_lock(&adapter->lock);
list_for_each_entry (iter_bss, &adapter->network_list, list) {
if (compare_ether_addr(iter_bss->bssid, bssid))
continue; /* bssid doesn't match */
switch (mode) {
case IW_MODE_INFRA:
case IW_MODE_ADHOC:
if (!is_network_compatible(adapter, iter_bss, mode))
break;
found_bss = iter_bss;
break;
default:
found_bss = iter_bss;
break;
}
}
mutex_unlock(&adapter->lock);
return found_bss;
}
/**
* @brief This function finds ssid in ssid list.
*
* @param adapter A pointer to wlan_adapter
* @param ssid SSID to find in the list
* @param bssid BSSID to qualify the SSID selection (if provided)
* @param mode Network mode: Infrastructure or IBSS
*
* @return index in BSSID list
*/
struct bss_descriptor * libertas_find_ssid_in_list(wlan_adapter * adapter,
u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
int channel)
{
u8 bestrssi = 0;
struct bss_descriptor * iter_bss = NULL;
struct bss_descriptor * found_bss = NULL;
struct bss_descriptor * tmp_oldest = NULL;
mutex_lock(&adapter->lock);
list_for_each_entry (iter_bss, &adapter->network_list, list) {
if ( !tmp_oldest
|| (iter_bss->last_scanned < tmp_oldest->last_scanned))
tmp_oldest = iter_bss;
if (libertas_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
ssid, ssid_len) != 0)
continue; /* ssid doesn't match */
if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
continue; /* bssid doesn't match */
if ((channel > 0) && (iter_bss->channel != channel))
continue; /* channel doesn't match */
switch (mode) {
case IW_MODE_INFRA:
case IW_MODE_ADHOC:
if (!is_network_compatible(adapter, iter_bss, mode))
break;
if (bssid) {
/* Found requested BSSID */
found_bss = iter_bss;
goto out;
}
if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
bestrssi = SCAN_RSSI(iter_bss->rssi);
found_bss = iter_bss;
}
break;
case IW_MODE_AUTO:
default:
if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
bestrssi = SCAN_RSSI(iter_bss->rssi);
found_bss = iter_bss;
}
break;
}
}
out:
mutex_unlock(&adapter->lock);
return found_bss;
}
/**
* @brief This function finds the best SSID in the Scan List
*
* Search the scan table for the best SSID that also matches the current
* adapter network preference (infrastructure or adhoc)
*
* @param adapter A pointer to wlan_adapter
*
* @return index in BSSID list
*/
struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
u8 mode)
{
u8 bestrssi = 0;
struct bss_descriptor * iter_bss;
struct bss_descriptor * best_bss = NULL;
mutex_lock(&adapter->lock);
list_for_each_entry (iter_bss, &adapter->network_list, list) {
switch (mode) {
case IW_MODE_INFRA:
case IW_MODE_ADHOC:
if (!is_network_compatible(adapter, iter_bss, mode))
break;
if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
break;
bestrssi = SCAN_RSSI(iter_bss->rssi);
best_bss = iter_bss;
break;
case IW_MODE_AUTO:
default:
if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
break;
bestrssi = SCAN_RSSI(iter_bss->rssi);
best_bss = iter_bss;
break;
}
}
mutex_unlock(&adapter->lock);
return best_bss;
}
/**
* @brief Find the AP with specific ssid in the scan list
*
* @param priv A pointer to wlan_private structure
* @param pSSID A pointer to AP's ssid
*
* @return 0--success, otherwise--fail
*/
int libertas_find_best_network_ssid(wlan_private * priv,
u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
{
wlan_adapter *adapter = priv->adapter;
int ret = -1;
struct bss_descriptor * found;
lbs_deb_enter(LBS_DEB_ASSOC);
wlan_scan_networks(priv, NULL, 1);
if (adapter->surpriseremoved)
return -1;
wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
if (found && (found->ssid_len > 0)) {
memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
*out_ssid_len = found->ssid_len;
*out_mode = found->mode;
ret = 0;
}
lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
return ret;
}
/**
* @brief Scan Network
*
* @param dev A pointer to net_device structure
* @param info A pointer to iw_request_info structure
* @param vwrq A pointer to iw_param structure
* @param extra A pointer to extra data buf
*
* @return 0 --success, otherwise fail
*/
int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
struct iw_param *vwrq, char *extra)
{
wlan_private *priv = dev->priv;
wlan_adapter *adapter = priv->adapter;
lbs_deb_enter(LBS_DEB_SCAN);
wlan_scan_networks(priv, NULL, 0);
if (adapter->surpriseremoved)
return -1;
lbs_deb_leave(LBS_DEB_SCAN);
return 0;
}
/**
* @brief Send a scan command for all available channels filtered on a spec
*
* @param priv A pointer to wlan_private structure
* @param prequestedssid A pointer to AP's ssid
* @param keeppreviousscan Flag used to save/clear scan table before scan
*
* @return 0-success, otherwise fail
*/
int libertas_send_specific_ssid_scan(wlan_private * priv,
u8 *ssid, u8 ssid_len, u8 clear_ssid)
{
wlan_adapter *adapter = priv->adapter;
struct wlan_ioctl_user_scan_cfg scancfg;
int ret = 0;
lbs_deb_enter(LBS_DEB_ASSOC);
if (!ssid_len)
goto out;
memset(&scancfg, 0x00, sizeof(scancfg));
memcpy(scancfg.ssid, ssid, ssid_len);
scancfg.ssid_len = ssid_len;
scancfg.clear_ssid = clear_ssid;
wlan_scan_networks(priv, &scancfg, 1);
if (adapter->surpriseremoved)
return -1;
wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
out:
lbs_deb_leave(LBS_DEB_ASSOC);
return ret;
}
/**
* @brief scan an AP with specific BSSID
*
* @param priv A pointer to wlan_private structure
* @param bssid A pointer to AP's bssid
* @param keeppreviousscan Flag used to save/clear scan table before scan
*
* @return 0-success, otherwise fail
*/
int libertas_send_specific_bssid_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
{
struct wlan_ioctl_user_scan_cfg scancfg;
lbs_deb_enter(LBS_DEB_ASSOC);
if (bssid == NULL)
goto out;
memset(&scancfg, 0x00, sizeof(scancfg));
memcpy(scancfg.bssid, bssid, ETH_ALEN);
scancfg.clear_bssid = clear_bssid;
wlan_scan_networks(priv, &scancfg, 1);
if (priv->adapter->surpriseremoved)
return -1;
wait_event_interruptible(priv->adapter->cmd_pending,
!priv->adapter->nr_cmd_pending);
out:
lbs_deb_leave(LBS_DEB_ASSOC);
return 0;
}
static inline char *libertas_translate_scan(wlan_private *priv,
char *start, char *stop,
struct bss_descriptor *bss)
{
wlan_adapter *adapter = priv->adapter;
struct chan_freq_power *cfp;
char *current_val; /* For rates */
struct iw_event iwe; /* Temporary buffer */
int j;
#define PERFECT_RSSI ((u8)50)
#define WORST_RSSI ((u8)0)
#define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI))
u8 rssi;
cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
if (!cfp) {
lbs_deb_scan("Invalid channel number %d\n", bss->channel);
return NULL;
}
/* First entry *MUST* be the AP BSSID */
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
/* SSID */
iwe.cmd = SIOCGIWESSID;
iwe.u.data.flags = 1;
iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
/* Mode */
iwe.cmd = SIOCGIWMODE;
iwe.u.mode = bss->mode;
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
/* Frequency */
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = (long)cfp->freq * 100000;
iwe.u.freq.e = 1;
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
/* Add quality statistics */
iwe.cmd = IWEVQUAL;
iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
iwe.u.qual.level = SCAN_RSSI(bss->rssi);
rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
iwe.u.qual.qual =
(100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
(15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
(RSSI_DIFF * RSSI_DIFF);
if (iwe.u.qual.qual > 100)
iwe.u.qual.qual = 100;
if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
} else {
iwe.u.qual.noise =
CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
}
/* Locally created ad-hoc BSSs won't have beacons if this is the
* only station in the adhoc network; so get signal strength
* from receive statistics.
*/
if ((adapter->mode == IW_MODE_ADHOC)
&& adapter->adhoccreate
&& !libertas_ssid_cmp(adapter->curbssparams.ssid,
adapter->curbssparams.ssid_len,
bss->ssid, bss->ssid_len)) {
int snr, nf;
snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
iwe.u.qual.level = CAL_RSSI(snr, nf);
}
start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
/* Add encryption capability */
iwe.cmd = SIOCGIWENCODE;
if (bss->privacy) {
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
} else {
iwe.u.data.flags = IW_ENCODE_DISABLED;
}
iwe.u.data.length = 0;
start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
current_val = start + IW_EV_LCP_LEN;
iwe.cmd = SIOCGIWRATE;
iwe.u.bitrate.fixed = 0;
iwe.u.bitrate.disabled = 0;
iwe.u.bitrate.value = 0;
for (j = 0; j < sizeof(bss->libertas_supported_rates); j++) {
u8 rate = bss->libertas_supported_rates[j];
if (rate == 0)
break; /* no more rates */
/* Bit rate given in 500 kb/s units (+ 0x80) */
iwe.u.bitrate.value = (rate & 0x7f) * 500000;
current_val = iwe_stream_add_value(start, current_val,
stop, &iwe, IW_EV_PARAM_LEN);
}
if ((bss->mode == IW_MODE_ADHOC)
&& !libertas_ssid_cmp(adapter->curbssparams.ssid,
adapter->curbssparams.ssid_len,
bss->ssid, bss->ssid_len)
&& adapter->adhoccreate) {
iwe.u.bitrate.value = 22 * 500000;
current_val = iwe_stream_add_value(start, current_val,
stop, &iwe, IW_EV_PARAM_LEN);
}
/* Check if we added any event */
if((current_val - start) > IW_EV_LCP_LEN)
start = current_val;
memset(&iwe, 0, sizeof(iwe));
if (bss->wpa_ie_len) {
char buf[MAX_WPA_IE_LEN];
memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
iwe.cmd = IWEVGENIE;
iwe.u.data.length = bss->wpa_ie_len;
start = iwe_stream_add_point(start, stop, &iwe, buf);
}
memset(&iwe, 0, sizeof(iwe));
if (bss->rsn_ie_len) {
char buf[MAX_WPA_IE_LEN];
memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
iwe.cmd = IWEVGENIE;
iwe.u.data.length = bss->rsn_ie_len;
start = iwe_stream_add_point(start, stop, &iwe, buf);
}
return start;
}
/**
* @brief Retrieve the scan table entries via wireless tools IOCTL call
*
* @param dev A pointer to net_device structure
* @param info A pointer to iw_request_info structure
* @param dwrq A pointer to iw_point structure
* @param extra A pointer to extra data buf
*
* @return 0 --success, otherwise fail
*/
int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
struct iw_point *dwrq, char *extra)
{
#define SCAN_ITEM_SIZE 128
wlan_private *priv = dev->priv;
wlan_adapter *adapter = priv->adapter;
int err = 0;
char *ev = extra;
char *stop = ev + dwrq->length;
struct bss_descriptor * iter_bss;
struct bss_descriptor * safe;
lbs_deb_enter(LBS_DEB_ASSOC);
/* If we've got an uncompleted scan, schedule the next part */
if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
wlan_scan_networks(priv, NULL, 0);
/* Update RSSI if current BSS is a locally created ad-hoc BSS */
if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0,
cmd_option_waitforrsp, 0, NULL);
}
mutex_lock(&adapter->lock);
list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
char * next_ev;
unsigned long stale_time;
if (stop - ev < SCAN_ITEM_SIZE) {
err = -E2BIG;
break;
}
/* Prune old an old scan result */
stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
if (time_after(jiffies, stale_time)) {
list_move_tail (&iter_bss->list,
&adapter->network_free_list);
clear_bss_descriptor(iter_bss);
continue;
}
/* Translate to WE format this entry */
next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
if (next_ev == NULL)
continue;
ev = next_ev;
}
mutex_unlock(&adapter->lock);
dwrq->length = (ev - extra);
dwrq->flags = 0;
lbs_deb_leave(LBS_DEB_ASSOC);
return err;
}
/**
* @brief Prepare a scan command to be sent to the firmware
*
* Use the wlan_scan_cmd_config sent to the command processing module in
* the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
* struct 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.
*
* @param priv A pointer to wlan_private structure
* @param cmd A pointer to cmd_ds_command structure to be sent to
* firmware with the cmd_DS_801_11_SCAN structure
* @param pdata_buf Void pointer cast of a wlan_scan_cmd_config struct used
* to set the fields/TLVs for the command sent to firmware
*
* @return 0 or -1
*
* @sa wlan_scan_create_channel_list
*/
int libertas_cmd_80211_scan(wlan_private * priv,
struct cmd_ds_command *cmd, void *pdata_buf)
{
struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
struct wlan_scan_cmd_config *pscancfg;
lbs_deb_enter(LBS_DEB_ASSOC);
pscancfg = pdata_buf;
/* Set fixed field variables in scan command */
pscan->bsstype = pscancfg->bsstype;
memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
cmd->command = cpu_to_le16(cmd_802_11_scan);
/* size is equal to the sizeof(fixed portions) + the TLV len + header */
cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
+ sizeof(pscan->BSSID)
+ pscancfg->tlvbufferlen + S_DS_GEN);
lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
le16_to_cpu(cmd->seqnum));
lbs_deb_leave(LBS_DEB_ASSOC);
return 0;
}
static inline int is_same_network(struct bss_descriptor *src,
struct bss_descriptor *dst)
{
/* A network is only a duplicate if the channel, BSSID, and ESSID
* all match. We treat all <hidden> with the same BSSID and channel
* as one network */
return ((src->ssid_len == dst->ssid_len) &&
(src->channel == dst->channel) &&
!compare_ether_addr(src->bssid, dst->bssid) &&
!memcmp(src->ssid, dst->ssid, src->ssid_len));
}
/**
* @brief This function handles the command response of scan
*
* The response buffer for the scan command has the following
* memory layout:
*
* .-----------------------------------------------------------.
* | header (4 * sizeof(u16)): Standard command response hdr |
* .-----------------------------------------------------------.
* | bufsize (u16) : sizeof the BSS Description data |
* .-----------------------------------------------------------.
* | NumOfSet (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) |
* .-----------------------------------------------------------.
*
* @param priv A pointer to wlan_private structure
* @param resp A pointer to cmd_ds_command
*
* @return 0 or -1
*/
int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
{
wlan_adapter *adapter = priv->adapter;
struct cmd_ds_802_11_scan_rsp *pscan;
struct mrvlietypes_data *ptlv;
struct mrvlietypes_tsftimestamp *ptsftlv;
struct bss_descriptor * iter_bss;
struct bss_descriptor * safe;
u8 *pbssinfo;
u16 scanrespsize;
int bytesleft;
int idx;
int tlvbufsize;
int ret;
lbs_deb_enter(LBS_DEB_ASSOC);
/* Prune old entries from scan table */
list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
if (time_before(jiffies, stale_time))
continue;
list_move_tail (&iter_bss->list, &adapter->network_free_list);
clear_bss_descriptor(iter_bss);
}
pscan = &resp->params.scanresp;
if (pscan->nr_sets > MAX_NETWORK_COUNT) {
lbs_deb_scan(
"SCAN_RESP: too many scan results (%d, max %d)!!\n",
pscan->nr_sets, MAX_NETWORK_COUNT);
ret = -1;
goto done;
}
bytesleft = le16_to_cpu(pscan->bssdescriptsize);
lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
scanrespsize = le16_to_cpu(resp->size);
lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
pscan->nr_sets);
pbssinfo = pscan->bssdesc_and_tlvbuffer;
/* The size of the TLV buffer is equal to the entire command response
* size (scanrespsize) minus the fixed fields (sizeof()'s), the
* BSS Descriptions (bssdescriptsize as bytesLef) and the command
* response header (S_DS_GEN)
*/
tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
+ sizeof(pscan->nr_sets)
+ S_DS_GEN);
ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
/* Search the TLV buffer space in the scan response for any valid TLVs */
wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
/*
* Process each scan response returned (pscan->nr_sets). Save
* the information in the newbssentry 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
*/
for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
struct bss_descriptor new;
struct bss_descriptor * found = NULL;
struct bss_descriptor * oldest = NULL;
/* Process the data fields and IEs returned for this BSS */
memset(&new, 0, sizeof (struct bss_descriptor));
if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
/* error parsing the scan response, skipped */
lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
continue;
}
/* Try to find this bss in the scan table */
list_for_each_entry (iter_bss, &adapter->network_list, list) {
if (is_same_network(iter_bss, &new)) {
found = iter_bss;
break;
}
if ((oldest == NULL) ||
(iter_bss->last_scanned < oldest->last_scanned))
oldest = iter_bss;
}
if (found) {
/* found, clear it */
clear_bss_descriptor(found);
} else if (!list_empty(&adapter->network_free_list)) {
/* Pull one from the free list */
found = list_entry(adapter->network_free_list.next,
struct bss_descriptor, list);
list_move_tail(&found->list, &adapter->network_list);
} else if (oldest) {
/* If there are no more slots, expire the oldest */
found = oldest;
clear_bss_descriptor(found);
list_move_tail(&found->list, &adapter->network_list);
} else {
continue;
}
lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
new.bssid[0], new.bssid[1], new.bssid[2],
new.bssid[3], new.bssid[4], new.bssid[5]);
/*
* If the TSF TLV was appended to the scan results, save the
* this entries 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 (ptsftlv) {
new.networktsf = le64_to_cpup(&ptsftlv->tsftable[idx]);
}
/* Copy the locally created newbssentry to the scan table */
memcpy(found, &new, offsetof(struct bss_descriptor, list));
}
ret = 0;
done:
lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
return ret;
}
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