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linux/drivers/net/wireless/libertas/scan.c
Marcelo Tosatti 064827edf6 [PATCH] libertas: scan two channels per scan command 
Scan two channels per each command on set_scan(), then bail out and let
get_scan() continue the scanning work up to the last channel.

This gives time to the firmware so it can go back to the association
channel and keep the connection alive.

Fixes http://dev.laptop.org/ticket/841

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-06-11 14:28:35 -04:00

2021 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 <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
//! Macro to enable/disable SSID checking before storing a scan table
#ifdef DISCARD_BAD_SSID
#define CHECK_SSID_IS_VALID(x) ssid_valid(&bssidEntry.ssid)
#else
#define CHECK_SSID_IS_VALID(x) 1
#endif
/**
* @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, int index, u8 mode)
{
ENTER();
if (adapter->scantable[index].mode == mode) {
if ( !adapter->secinfo.wep_enabled
&& !adapter->secinfo.WPAenabled
&& !adapter->secinfo.WPA2enabled
&& adapter->scantable[index].wpa_ie[0] != WPA_IE
&& adapter->scantable[index].rsn_ie[0] != WPA2_IE
&& !adapter->scantable[index].privacy) {
/* no security */
LEAVE();
return index;
} else if ( adapter->secinfo.wep_enabled
&& !adapter->secinfo.WPAenabled
&& !adapter->secinfo.WPA2enabled
&& adapter->scantable[index].privacy) {
/* static WEP enabled */
LEAVE();
return index;
} else if ( !adapter->secinfo.wep_enabled
&& adapter->secinfo.WPAenabled
&& !adapter->secinfo.WPA2enabled
&& (adapter->scantable[index].wpa_ie[0] == WPA_IE)
/* privacy bit may NOT be set in some APs like LinkSys WRT54G
&& adapter->scantable[index].privacy */
) {
/* WPA enabled */
lbs_pr_debug(1,
"is_network_compatible() WPA: index=%d wpa_ie=%#x "
"wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
"privacy=%#x\n", index,
adapter->scantable[index].wpa_ie[0],
adapter->scantable[index].rsn_ie[0],
adapter->secinfo.wep_enabled ? "e" : "d",
adapter->secinfo.WPAenabled ? "e" : "d",
adapter->secinfo.WPA2enabled ? "e" : "d",
adapter->scantable[index].privacy);
LEAVE();
return index;
} else if ( !adapter->secinfo.wep_enabled
&& !adapter->secinfo.WPAenabled
&& adapter->secinfo.WPA2enabled
&& (adapter->scantable[index].rsn_ie[0] == WPA2_IE)
/* privacy bit may NOT be set in some APs like LinkSys WRT54G
&& adapter->scantable[index].privacy */
) {
/* WPA2 enabled */
lbs_pr_debug(1,
"is_network_compatible() WPA2: index=%d wpa_ie=%#x "
"wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
"privacy=%#x\n", index,
adapter->scantable[index].wpa_ie[0],
adapter->scantable[index].rsn_ie[0],
adapter->secinfo.wep_enabled ? "e" : "d",
adapter->secinfo.WPAenabled ? "e" : "d",
adapter->secinfo.WPA2enabled ? "e" : "d",
adapter->scantable[index].privacy);
LEAVE();
return index;
} else if ( !adapter->secinfo.wep_enabled
&& !adapter->secinfo.WPAenabled
&& !adapter->secinfo.WPA2enabled
&& (adapter->scantable[index].wpa_ie[0] != WPA_IE)
&& (adapter->scantable[index].rsn_ie[0] != WPA2_IE)
&& adapter->scantable[index].privacy) {
/* dynamic WEP enabled */
lbs_pr_debug(1,
"is_network_compatible() dynamic WEP: index=%d "
"wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
index,
adapter->scantable[index].wpa_ie[0],
adapter->scantable[index].rsn_ie[0],
adapter->scantable[index].privacy);
LEAVE();
return index;
}
/* security doesn't match */
lbs_pr_debug(1,
"is_network_compatible() FAILED: index=%d wpa_ie=%#x "
"wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
index,
adapter->scantable[index].wpa_ie[0],
adapter->scantable[index].rsn_ie[0],
adapter->secinfo.wep_enabled ? "e" : "d",
adapter->secinfo.WPAenabled ? "e" : "d",
adapter->secinfo.WPA2enabled ? "e" : "d",
adapter->scantable[index].privacy);
LEAVE();
return -ECONNREFUSED;
}
/* mode doesn't match */
LEAVE();
return -ENETUNREACH;
}
/**
* @brief This function validates a SSID as being able to be printed
*
* @param pssid SSID structure to validate
*
* @return TRUE or FALSE
*/
static u8 ssid_valid(struct WLAN_802_11_SSID *pssid)
{
int ssididx;
for (ssididx = 0; ssididx < pssid->ssidlength; ssididx++) {
if (!isprint(pssid->ssid[ssididx])) {
return 0;
}
}
return 1;
}
/**
* @brief Post process the scan table after a new scan command has completed
*
* Inspect each entry of the scan table and try to find an entry that
* matches our current associated/joined network from the scan. If
* one is found, update the stored copy of the bssdescriptor for our
* current network.
*
* Debug dump the current scan table contents if compiled accordingly.
*
* @param priv A pointer to wlan_private structure
*
* @return void
*/
static void wlan_scan_process_results(wlan_private * priv)
{
wlan_adapter *adapter = priv->adapter;
int foundcurrent;
int i;
foundcurrent = 0;
if (adapter->connect_status == libertas_connected) {
/* try to find the current BSSID in the new scan list */
for (i = 0; i < adapter->numinscantable; i++) {
if (!libertas_SSID_cmp(&adapter->scantable[i].ssid,
&adapter->curbssparams.ssid) &&
!memcmp(adapter->curbssparams.bssid,
adapter->scantable[i].macaddress,
ETH_ALEN)) {
foundcurrent = 1;
}
}
if (foundcurrent) {
/* Make a copy of current BSSID descriptor */
memcpy(&adapter->curbssparams.bssdescriptor,
&adapter->scantable[i],
sizeof(adapter->curbssparams.bssdescriptor));
}
}
for (i = 0; i < adapter->numinscantable; i++) {
lbs_pr_debug(1, "Scan:(%02d) %02x:%02x:%02x:%02x:%02x:%02x, "
"RSSI[%03d], SSID[%s]\n",
i,
adapter->scantable[i].macaddress[0],
adapter->scantable[i].macaddress[1],
adapter->scantable[i].macaddress[2],
adapter->scantable[i].macaddress[3],
adapter->scantable[i].macaddress[4],
adapter->scantable[i].macaddress[5],
(s32) adapter->scantable[i].rssi,
adapter->scantable[i].ssid.ssid);
}
}
/**
* @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;
const u8 zeromac[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
struct mrvlietypes_numprobes *pnumprobestlv;
struct mrvlietypes_ssidparamset *pssidtlv;
struct wlan_scan_cmd_config * pscancfgout = NULL;
u8 *ptlvpos;
u16 numprobes;
u16 ssidlen;
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->specificBSSID,
puserscanin->specificBSSID,
sizeof(pscancfgout->specificBSSID));
ssidlen = strlen(puserscanin->specificSSID);
if (ssidlen) {
pssidtlv =
(struct mrvlietypes_ssidparamset *) pscancfgout->
tlvbuffer;
pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
pssidtlv->header.len = cpu_to_le16(ssidlen);
memcpy(pssidtlv->ssid, puserscanin->specificSSID,
ssidlen);
ptlvpos += sizeof(pssidtlv->header) + ssidlen;
}
/*
* 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 (ssidlen || (memcmp(pscancfgout->specificBSSID,
&zeromac, sizeof(zeromac)) != 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 = sizeof(pnumprobestlv->numprobes);
pnumprobestlv->numprobes = cpu_to_le16(numprobes);
ptlvpos +=
sizeof(pnumprobestlv->header) + pnumprobestlv->header.len;
pnumprobestlv->header.len =
cpu_to_le16(pnumprobestlv->header.len);
}
/*
* 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_pr_debug(1, "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_pr_debug(1, "Scan: Scanning current channel only");
}
} else {
lbs_pr_debug(1, "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)
{
struct chanscanparamset *ptmpchan;
struct chanscanparamset *pstartchan;
u8 scanband;
int doneearly;
int tlvidx;
int ret = 0;
int scanned = 0;
union iwreq_data wrqu;
ENTER();
if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
lbs_pr_debug(1, "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_pr_debug(1,
"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 */
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)
+ 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) {
priv->adapter->last_scanned_channel = ptmpchan->channumber;
return 0;
}
}
priv->adapter->last_scanned_channel = ptmpchan->channumber;
memset(&wrqu, 0, sizeof(union iwreq_data));
wireless_send_event(priv->wlan_dev.netdev, SIOCGIWSCAN, &wrqu, NULL);
LEAVE();
return ret;
}
/**
* @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)
{
wlan_adapter *adapter = priv->adapter;
struct mrvlietypes_chanlistparamset *pchantlvout;
struct chanscanparamset * scan_chan_list = NULL;
struct wlan_scan_cmd_config * scan_cfg = NULL;
u8 keeppreviousscan;
u8 filteredscan;
u8 scancurrentchanonly;
int maxchanperscan;
int ret;
ENTER();
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;
}
keeppreviousscan = 0;
if (puserscanin) {
keeppreviousscan = puserscanin->keeppreviousscan;
}
if (adapter->last_scanned_channel)
keeppreviousscan = 1;
if (!keeppreviousscan) {
memset(adapter->scantable, 0x00,
sizeof(struct bss_descriptor) * MRVDRV_MAX_BSSID_LIST);
adapter->numinscantable = 0;
}
/* Keep the data path active if we are only scanning our current channel */
if (!scancurrentchanonly) {
netif_stop_queue(priv->wlan_dev.netdev);
netif_carrier_off(priv->wlan_dev.netdev);
}
ret = wlan_scan_channel_list(priv,
maxchanperscan,
filteredscan,
scan_cfg,
pchantlvout,
scan_chan_list,
puserscanin);
/* Process the resulting scan table:
* - Remove any bad ssids
* - Update our current BSS information from scan data
*/
wlan_scan_process_results(priv);
if (priv->adapter->connect_status == libertas_connected) {
netif_carrier_on(priv->wlan_dev.netdev);
netif_wake_queue(priv->wlan_dev.netdev);
}
out:
if (scan_cfg)
kfree(scan_cfg);
if (scan_chan_list)
kfree(scan_chan_list);
LEAVE();
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_pr_debug(1, "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_pr_debug(1, "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 pBSSIDEntry Output parameter: Pointer to the BSS Entry
*
* @return 0 or -1
*/
static int InterpretBSSDescriptionWithIE(struct bss_descriptor * pBSSEntry,
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;
struct IE_WPA *pIe;
const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
struct ieeetypes_countryinfoset *pcountryinfo;
ENTER();
founddatarateie = 0;
ratesize = 0;
beaconsize = 0;
if (*bytesleft >= sizeof(beaconsize)) {
/* Extract & convert beacon size from the command buffer */
memcpy(&beaconsize, *pbeaconinfo, sizeof(beaconsize));
beaconsize = le16_to_cpu(beaconsize);
*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(pBSSEntry->macaddress, pcurrentptr, ETH_ALEN);
lbs_pr_debug(1, "InterpretIE: AP MAC Addr-%x:%x:%x:%x:%x:%x\n",
pBSSEntry->macaddress[0], pBSSEntry->macaddress[1],
pBSSEntry->macaddress[2], pBSSEntry->macaddress[3],
pBSSEntry->macaddress[4], pBSSEntry->macaddress[5]);
pcurrentptr += ETH_ALEN;
bytesleftforcurrentbeacon -= ETH_ALEN;
if (bytesleftforcurrentbeacon < 12) {
lbs_pr_debug(1, "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 */
pBSSEntry->rssi = le32_to_cpu((long)(*pcurrentptr));
lbs_pr_debug(1, "InterpretIE: RSSI=%02X\n", *pcurrentptr);
pcurrentptr += 1;
bytesleftforcurrentbeacon -= 1;
/* time stamp is 8 bytes long */
memcpy(fixedie.timestamp, pcurrentptr, 8);
memcpy(pBSSEntry->timestamp, pcurrentptr, 8);
pcurrentptr += 8;
bytesleftforcurrentbeacon -= 8;
/* beacon interval is 2 bytes long */
memcpy(&fixedie.beaconinterval, pcurrentptr, 2);
pBSSEntry->beaconperiod = le16_to_cpu(fixedie.beaconinterval);
pcurrentptr += 2;
bytesleftforcurrentbeacon -= 2;
/* capability information is 2 bytes long */
memcpy(&fixedie.capabilities, pcurrentptr, 2);
lbs_pr_debug(1, "InterpretIE: fixedie.capabilities=0x%X\n",
fixedie.capabilities);
fixedie.capabilities = le16_to_cpu(fixedie.capabilities);
pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
memcpy(&pBSSEntry->cap, pcap, sizeof(struct ieeetypes_capinfo));
pcurrentptr += 2;
bytesleftforcurrentbeacon -= 2;
/* rest of the current buffer are IE's */
lbs_pr_debug(1, "InterpretIE: IElength for this AP = %d\n",
bytesleftforcurrentbeacon);
lbs_dbg_hex("InterpretIE: IE info", (u8 *) pcurrentptr,
bytesleftforcurrentbeacon);
if (pcap->privacy) {
lbs_pr_debug(1, "InterpretIE: AP WEP enabled\n");
pBSSEntry->privacy = wlan802_11privfilter8021xWEP;
} else {
pBSSEntry->privacy = wlan802_11privfilteracceptall;
}
if (pcap->ibss == 1) {
pBSSEntry->mode = IW_MODE_ADHOC;
} else {
pBSSEntry->mode = IW_MODE_INFRA;
}
/* process variable IE */
while (bytesleftforcurrentbeacon >= 2) {
elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
elemlen = *((u8 *) pcurrentptr + 1);
if (bytesleftforcurrentbeacon < elemlen) {
lbs_pr_debug(1, "InterpretIE: error in processing IE, "
"bytes left < IE length\n");
bytesleftforcurrentbeacon = 0;
continue;
}
switch (elemID) {
case SSID:
pBSSEntry->ssid.ssidlength = elemlen;
memcpy(pBSSEntry->ssid.ssid, (pcurrentptr + 2),
elemlen);
lbs_pr_debug(1, "ssid: %32s", pBSSEntry->ssid.ssid);
break;
case SUPPORTED_RATES:
memcpy(pBSSEntry->datarates, (pcurrentptr + 2),
elemlen);
memmove(pBSSEntry->libertas_supported_rates, (pcurrentptr + 2),
elemlen);
ratesize = elemlen;
founddatarateie = 1;
break;
case EXTRA_IE:
lbs_pr_debug(1, "InterpretIE: EXTRA_IE Found!\n");
pBSSEntry->extra_ie = 1;
break;
case FH_PARAM_SET:
pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
memmove(&pBSSEntry->phyparamset.fhparamset, pFH,
sizeof(struct ieeetypes_fhparamset));
pBSSEntry->phyparamset.fhparamset.dwelltime
=
le16_to_cpu(pBSSEntry->phyparamset.fhparamset.
dwelltime);
break;
case DS_PARAM_SET:
pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
pBSSEntry->channel = pDS->currentchan;
memcpy(&pBSSEntry->phyparamset.dsparamset, pDS,
sizeof(struct ieeetypes_dsparamset));
break;
case CF_PARAM_SET:
pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
memcpy(&pBSSEntry->ssparamset.cfparamset, pCF,
sizeof(struct ieeetypes_cfparamset));
break;
case IBSS_PARAM_SET:
pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
pBSSEntry->atimwindow =
le32_to_cpu(pibss->atimwindow);
memmove(&pBSSEntry->ssparamset.ibssparamset, pibss,
sizeof(struct ieeetypes_ibssparamset));
pBSSEntry->ssparamset.ibssparamset.atimwindow
=
le16_to_cpu(pBSSEntry->ssparamset.ibssparamset.
atimwindow);
break;
/* Handle Country Info IE */
case COUNTRY_INFO:
pcountryinfo =
(struct ieeetypes_countryinfoset *) pcurrentptr;
if (pcountryinfo->len <
sizeof(pcountryinfo->countrycode)
|| pcountryinfo->len > 254) {
lbs_pr_debug(1, "InterpretIE: 11D- Err "
"CountryInfo len =%d min=%zd max=254\n",
pcountryinfo->len,
sizeof(pcountryinfo->countrycode));
LEAVE();
return -1;
}
memcpy(&pBSSEntry->countryinfo,
pcountryinfo, pcountryinfo->len + 2);
lbs_dbg_hex("InterpretIE: 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 *) pBSSEntry->datarates;
pRate += ratesize;
memmove(pRate, (pcurrentptr + 2), bytestocopy);
pRate = (u8 *) pBSSEntry->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;
pBSSEntry->wpa_ie_len = min_t(size_t,
elemlen + IE_ID_LEN_FIELDS_BYTES,
sizeof(pBSSEntry->wpa_ie));
memcpy(pBSSEntry->wpa_ie, pcurrentptr,
pBSSEntry->wpa_ie_len);
lbs_dbg_hex("InterpretIE: Resp WPA_IE",
pBSSEntry->wpa_ie, elemlen);
break;
case WPA2_IE:
pIe = (struct IE_WPA *)pcurrentptr;
pBSSEntry->rsn_ie_len = min_t(size_t,
elemlen + IE_ID_LEN_FIELDS_BYTES,
sizeof(pBSSEntry->rsn_ie));
memcpy(pBSSEntry->rsn_ie, pcurrentptr,
pBSSEntry->rsn_ie_len);
lbs_dbg_hex("InterpretIE: Resp WPA2_IE",
pBSSEntry->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) */
return 0;
}
/**
* @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(struct WLAN_802_11_SSID *ssid1, struct WLAN_802_11_SSID *ssid2)
{
if (!ssid1 || !ssid2)
return -1;
if (ssid1->ssidlength != ssid2->ssidlength)
return -1;
return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssidlength);
}
/**
* @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)
*/
int libertas_find_BSSID_in_list(wlan_adapter * adapter, u8 * bssid, u8 mode)
{
int ret = -ENETUNREACH;
int i;
if (!bssid)
return -EFAULT;
lbs_pr_debug(1, "FindBSSID: Num of BSSIDs = %d\n",
adapter->numinscantable);
/* 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; ret < 0 && i < adapter->numinscantable; i++) {
if (!memcmp(adapter->scantable[i].macaddress, bssid, ETH_ALEN)) {
switch (mode) {
case IW_MODE_INFRA:
case IW_MODE_ADHOC:
ret = is_network_compatible(adapter, i, mode);
break;
default:
ret = i;
break;
}
}
}
return ret;
}
/**
* @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
*/
int libertas_find_SSID_in_list(wlan_adapter * adapter,
struct WLAN_802_11_SSID *ssid, u8 * bssid, u8 mode)
{
int net = -ENETUNREACH;
u8 bestrssi = 0;
int i;
int j;
lbs_pr_debug(1, "Num of Entries in Table = %d\n", adapter->numinscantable);
for (i = 0; i < adapter->numinscantable; i++) {
if (!libertas_SSID_cmp(&adapter->scantable[i].ssid, ssid) &&
(!bssid ||
!memcmp(adapter->scantable[i].
macaddress, bssid, ETH_ALEN))) {
switch (mode) {
case IW_MODE_INFRA:
case IW_MODE_ADHOC:
j = is_network_compatible(adapter, i, mode);
if (j >= 0) {
if (bssid) {
return i;
}
if (SCAN_RSSI
(adapter->scantable[i].rssi)
> bestrssi) {
bestrssi =
SCAN_RSSI(adapter->
scantable[i].
rssi);
net = i;
}
} else {
if (net == -ENETUNREACH) {
net = j;
}
}
break;
case IW_MODE_AUTO:
default:
if (SCAN_RSSI(adapter->scantable[i].rssi)
> bestrssi) {
bestrssi =
SCAN_RSSI(adapter->scantable[i].
rssi);
net = i;
}
break;
}
}
}
return net;
}
/**
* @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
*/
int libertas_find_best_SSID_in_list(wlan_adapter * adapter, u8 mode)
{
int bestnet = -ENETUNREACH;
u8 bestrssi = 0;
int i;
ENTER();
lbs_pr_debug(1, "Num of BSSIDs = %d\n", adapter->numinscantable);
for (i = 0; i < adapter->numinscantable; i++) {
switch (mode) {
case IW_MODE_INFRA:
case IW_MODE_ADHOC:
if (is_network_compatible(adapter, i, mode) >= 0) {
if (SCAN_RSSI(adapter->scantable[i].rssi) >
bestrssi) {
bestrssi =
SCAN_RSSI(adapter->scantable[i].
rssi);
bestnet = i;
}
}
break;
case IW_MODE_AUTO:
default:
if (SCAN_RSSI(adapter->scantable[i].rssi) > bestrssi) {
bestrssi =
SCAN_RSSI(adapter->scantable[i].rssi);
bestnet = i;
}
break;
}
}
LEAVE();
return bestnet;
}
/**
* @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,
struct WLAN_802_11_SSID *pSSID,
u8 preferred_mode, u8 *out_mode)
{
wlan_adapter *adapter = priv->adapter;
int ret = 0;
struct bss_descriptor *preqbssid;
int i;
ENTER();
memset(pSSID, 0, sizeof(struct WLAN_802_11_SSID));
wlan_scan_networks(priv, NULL);
if (adapter->surpriseremoved)
return -1;
wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
i = libertas_find_best_SSID_in_list(adapter, preferred_mode);
if (i < 0) {
ret = -1;
goto out;
}
preqbssid = &adapter->scantable[i];
memcpy(pSSID, &preqbssid->ssid,
sizeof(struct WLAN_802_11_SSID));
*out_mode = preqbssid->mode;
if (!pSSID->ssidlength) {
ret = -1;
}
out:
LEAVE();
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;
ENTER();
wlan_scan_networks(priv, NULL);
if (adapter->surpriseremoved)
return -1;
LEAVE();
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,
struct WLAN_802_11_SSID *prequestedssid,
u8 keeppreviousscan)
{
wlan_adapter *adapter = priv->adapter;
struct wlan_ioctl_user_scan_cfg scancfg;
ENTER();
if (prequestedssid == NULL) {
return -1;
}
memset(&scancfg, 0x00, sizeof(scancfg));
memcpy(scancfg.specificSSID, prequestedssid->ssid,
prequestedssid->ssidlength);
scancfg.keeppreviousscan = keeppreviousscan;
wlan_scan_networks(priv, &scancfg);
if (adapter->surpriseremoved)
return -1;
wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
LEAVE();
return 0;
}
/**
* @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 keeppreviousscan)
{
struct wlan_ioctl_user_scan_cfg scancfg;
ENTER();
if (bssid == NULL) {
return -1;
}
memset(&scancfg, 0x00, sizeof(scancfg));
memcpy(scancfg.specificBSSID, bssid, sizeof(scancfg.specificBSSID));
scancfg.keeppreviousscan = keeppreviousscan;
wlan_scan_networks(priv, &scancfg);
if (priv->adapter->surpriseremoved)
return -1;
wait_event_interruptible(priv->adapter->cmd_pending,
!priv->adapter->nr_cmd_pending);
LEAVE();
return 0;
}
/**
* @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)
{
wlan_private *priv = dev->priv;
wlan_adapter *adapter = priv->adapter;
int ret = 0;
char *current_ev = extra;
char *end_buf = extra + IW_SCAN_MAX_DATA;
struct chan_freq_power *cfp;
struct bss_descriptor *pscantable;
char *current_val; /* For rates */
struct iw_event iwe; /* Temporary buffer */
int i;
int j;
int rate;
#define PERFECT_RSSI ((u8)50)
#define WORST_RSSI ((u8)0)
#define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI))
u8 rssi;
u8 buf[16 + 256 * 2];
u8 *ptr;
ENTER();
/*
* if there's either commands in the queue or one being
* processed return -EAGAIN for iwlist to retry later.
*/
if (adapter->nr_cmd_pending)
return -EAGAIN;
if (adapter->connect_status == libertas_connected)
lbs_pr_debug(1, "Current ssid: %32s\n",
adapter->curbssparams.ssid.ssid);
lbs_pr_debug(1, "Scan: Get: numinscantable = %d\n",
adapter->numinscantable);
/* The old API using SIOCGIWAPLIST had a hard limit of IW_MAX_AP.
* The new API using SIOCGIWSCAN is only limited by buffer size
* WE-14 -> WE-16 the buffer is limited to IW_SCAN_MAX_DATA bytes
* which is 4096.
*/
for (i = 0; i < adapter->numinscantable; i++) {
if ((current_ev + MAX_SCAN_CELL_SIZE) >= end_buf) {
lbs_pr_debug(1, "i=%d break out: current_ev=%p end_buf=%p "
"MAX_SCAN_CELL_SIZE=%zd\n",
i, current_ev, end_buf, MAX_SCAN_CELL_SIZE);
break;
}
pscantable = &adapter->scantable[i];
lbs_pr_debug(1, "i=%d ssid: %32s\n", i, pscantable->ssid.ssid);
cfp =
libertas_find_cfp_by_band_and_channel(adapter, 0,
pscantable->channel);
if (!cfp) {
lbs_pr_debug(1, "Invalid channel number %d\n",
pscantable->channel);
continue;
}
if (!ssid_valid(&adapter->scantable[i].ssid)) {
continue;
}
/* First entry *MUST* be the AP MAC address */
iwe.cmd = SIOCGIWAP;
iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
memcpy(iwe.u.ap_addr.sa_data,
&adapter->scantable[i].macaddress, ETH_ALEN);
iwe.len = IW_EV_ADDR_LEN;
current_ev =
iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len);
//Add the ESSID
iwe.u.data.length = adapter->scantable[i].ssid.ssidlength;
if (iwe.u.data.length > 32) {
iwe.u.data.length = 32;
}
iwe.cmd = SIOCGIWESSID;
iwe.u.data.flags = 1;
iwe.len = IW_EV_POINT_LEN + iwe.u.data.length;
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
adapter->scantable[i].ssid.
ssid);
//Add mode
iwe.cmd = SIOCGIWMODE;
iwe.u.mode = adapter->scantable[i].mode;
iwe.len = IW_EV_UINT_LEN;
current_ev =
iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len);
//frequency
iwe.cmd = SIOCGIWFREQ;
iwe.u.freq.m = (long)cfp->freq * 100000;
iwe.u.freq.e = 1;
iwe.len = IW_EV_FREQ_LEN;
current_ev =
iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len);
/* Add quality statistics */
iwe.cmd = IWEVQUAL;
iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
iwe.u.qual.level = SCAN_RSSI(adapter->scantable[i].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;
else if (iwe.u.qual.qual < 1)
iwe.u.qual.qual = 0;
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]);
}
if ((adapter->mode == IW_MODE_ADHOC) &&
!libertas_SSID_cmp(&adapter->curbssparams.ssid,
&adapter->scantable[i].ssid)
&& adapter->adhoccreate) {
ret = libertas_prepare_and_send_command(priv,
cmd_802_11_rssi,
0,
cmd_option_waitforrsp,
0, NULL);
if (!ret) {
iwe.u.qual.level =
CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] /
AVG_SCALE,
adapter->NF[TYPE_RXPD][TYPE_AVG] /
AVG_SCALE);
}
}
iwe.len = IW_EV_QUAL_LEN;
current_ev =
iwe_stream_add_event(current_ev, end_buf, &iwe, iwe.len);
/* Add encryption capability */
iwe.cmd = SIOCGIWENCODE;
if (adapter->scantable[i].privacy) {
iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
} else {
iwe.u.data.flags = IW_ENCODE_DISABLED;
}
iwe.u.data.length = 0;
iwe.len = IW_EV_POINT_LEN + iwe.u.data.length;
current_ev = iwe_stream_add_point(current_ev, end_buf, &iwe,
adapter->scantable->ssid.
ssid);
current_val = current_ev + IW_EV_LCP_LEN;
iwe.cmd = SIOCGIWRATE;
iwe.u.bitrate.fixed = 0;
iwe.u.bitrate.disabled = 0;
iwe.u.bitrate.value = 0;
/* Bit rate given in 500 kb/s units (+ 0x80) */
for (j = 0; j < sizeof(adapter->scantable[i].libertas_supported_rates);
j++) {
if (adapter->scantable[i].libertas_supported_rates[j] == 0) {
break;
}
rate =
(adapter->scantable[i].libertas_supported_rates[j] & 0x7F) *
500000;
if (rate > iwe.u.bitrate.value) {
iwe.u.bitrate.value = rate;
}
iwe.u.bitrate.value =
(adapter->scantable[i].libertas_supported_rates[j]
& 0x7f) * 500000;
iwe.len = IW_EV_PARAM_LEN;
current_ev =
iwe_stream_add_value(current_ev, current_val,
end_buf, &iwe, iwe.len);
}
if ((adapter->scantable[i].mode == IW_MODE_ADHOC)
&& !libertas_SSID_cmp(&adapter->curbssparams.ssid,
&adapter->scantable[i].ssid)
&& adapter->adhoccreate) {
iwe.u.bitrate.value = 22 * 500000;
}
iwe.len = IW_EV_PARAM_LEN;
current_ev =
iwe_stream_add_value(current_ev, current_val, end_buf, &iwe,
iwe.len);
/* Add new value to event */
current_val = current_ev + IW_EV_LCP_LEN;
if (adapter->scantable[i].rsn_ie[0] == WPA2_IE) {
memset(&iwe, 0, sizeof(iwe));
memset(buf, 0, sizeof(buf));
memcpy(buf, adapter->scantable[i].rsn_ie,
adapter->scantable[i].rsn_ie_len);
iwe.cmd = IWEVGENIE;
iwe.u.data.length = adapter->scantable[i].rsn_ie_len;
iwe.len = IW_EV_POINT_LEN + iwe.u.data.length;
current_ev = iwe_stream_add_point(current_ev, end_buf,
&iwe, buf);
}
if (adapter->scantable[i].wpa_ie[0] == WPA_IE) {
memset(&iwe, 0, sizeof(iwe));
memset(buf, 0, sizeof(buf));
memcpy(buf, adapter->scantable[i].wpa_ie,
adapter->scantable[i].wpa_ie_len);
iwe.cmd = IWEVGENIE;
iwe.u.data.length = adapter->scantable[i].wpa_ie_len;
iwe.len = IW_EV_POINT_LEN + iwe.u.data.length;
current_ev = iwe_stream_add_point(current_ev, end_buf,
&iwe, buf);
}
if (adapter->scantable[i].extra_ie != 0) {
memset(&iwe, 0, sizeof(iwe));
memset(buf, 0, sizeof(buf));
ptr = buf;
ptr += sprintf(ptr, "extra_ie");
iwe.u.data.length = strlen(buf);
lbs_pr_debug(1, "iwe.u.data.length %d\n",
iwe.u.data.length);
lbs_pr_debug(1, "BUF: %s \n", buf);
iwe.cmd = IWEVCUSTOM;
iwe.len = IW_EV_POINT_LEN + iwe.u.data.length;
current_ev =
iwe_stream_add_point(current_ev, end_buf, &iwe,
buf);
}
current_val = current_ev + IW_EV_LCP_LEN;
/*
* Check if we added any event
*/
if ((current_val - current_ev) > IW_EV_LCP_LEN)
current_ev = current_val;
}
dwrq->length = (current_ev - extra);
dwrq->flags = 0;
LEAVE();
return 0;
}
/**
* @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;
ENTER();
pscancfg = pdata_buf;
/* Set fixed field variables in scan command */
pscan->bsstype = pscancfg->bsstype;
memcpy(pscan->BSSID, pscancfg->specificBSSID, 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_pr_debug(1, "SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
cmd->command, cmd->size, cmd->seqnum);
LEAVE();
return 0;
}
/**
* @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 bss_descriptor newbssentry;
struct mrvlietypes_data *ptlv;
struct mrvlietypes_tsftimestamp *ptsftlv;
u8 *pbssinfo;
u16 scanrespsize;
int bytesleft;
int numintable;
int bssIdx;
int idx;
int tlvbufsize;
u64 tsfval;
ENTER();
pscan = &resp->params.scanresp;
if (pscan->nr_sets > MRVDRV_MAX_BSSID_LIST) {
lbs_pr_debug(1,
"SCAN_RESP: Invalid number of AP returned (%d)!!\n",
pscan->nr_sets);
LEAVE();
return -1;
}
bytesleft = le16_to_cpu(pscan->bssdescriptsize);
lbs_pr_debug(1, "SCAN_RESP: bssdescriptsize %d\n", bytesleft);
scanrespsize = le16_to_cpu(resp->size);
lbs_pr_debug(1, "SCAN_RESP: returned %d AP before parsing\n",
pscan->nr_sets);
numintable = adapter->numinscantable;
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++) {
/* Zero out the newbssentry we are about to store info in */
memset(&newbssentry, 0x00, sizeof(newbssentry));
/* Process the data fields and IEs returned for this BSS */
if ((InterpretBSSDescriptionWithIE(&newbssentry,
&pbssinfo,
&bytesleft) ==
0)
&& CHECK_SSID_IS_VALID(&newbssentry.ssid)) {
lbs_pr_debug(1,
"SCAN_RESP: BSSID = %02x:%02x:%02x:%02x:%02x:%02x\n",
newbssentry.macaddress[0],
newbssentry.macaddress[1],
newbssentry.macaddress[2],
newbssentry.macaddress[3],
newbssentry.macaddress[4],
newbssentry.macaddress[5]);
/*
* Search the scan table for the same bssid
*/
for (bssIdx = 0; bssIdx < numintable; bssIdx++) {
if (memcmp(newbssentry.macaddress,
adapter->scantable[bssIdx].
macaddress,
sizeof(newbssentry.macaddress)) ==
0) {
/*
* If the SSID matches as well, it is a duplicate of
* this entry. Keep the bssIdx set to this
* entry so we replace the old contents in the table
*/
if ((newbssentry.ssid.ssidlength ==
adapter->scantable[bssIdx].ssid.
ssidlength)
&&
(memcmp
(newbssentry.ssid.ssid,
adapter->scantable[bssIdx].ssid.
ssid,
newbssentry.ssid.ssidlength) ==
0)) {
lbs_pr_debug(1,
"SCAN_RESP: Duplicate of index: %d\n",
bssIdx);
break;
}
}
}
/*
* If the bssIdx is equal to the number of entries in the table,
* the new entry was not a duplicate; append it to the scan
* table
*/
if (bssIdx == numintable) {
/* Range check the bssIdx, keep it limited to the last entry */
if (bssIdx == MRVDRV_MAX_BSSID_LIST) {
bssIdx--;
} else {
numintable++;
}
}
/*
* 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) {
memcpy(&tsfval, &ptsftlv->tsftable[idx],
sizeof(tsfval));
tsfval = le64_to_cpu(tsfval);
memcpy(&newbssentry.networktsf,
&tsfval, sizeof(newbssentry.networktsf));
}
/* Copy the locally created newbssentry to the scan table */
memcpy(&adapter->scantable[bssIdx],
&newbssentry,
sizeof(adapter->scantable[bssIdx]));
} else {
/* error parsing/interpreting the scan response, skipped */
lbs_pr_debug(1, "SCAN_RESP: "
"InterpretBSSDescriptionWithIE returned ERROR\n");
}
}
lbs_pr_debug(1, "SCAN_RESP: Scanned %2d APs, %d valid, %d total\n",
pscan->nr_sets, numintable - adapter->numinscantable,
numintable);
/* Update the total number of BSSIDs in the scan table */
adapter->numinscantable = numintable;
LEAVE();
return 0;
}
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