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#include "wlan_includes.h"
//#define SCAN_RESULT_DEBUG
#ifndef FCS_LEN
#define FCS_LEN 4
#endif
/* Element ID of various Information Elements */
typedef enum {
ISSID = 0, /* Service Set Identifier */
ISUPRATES = 1, /* Supported Rates */
IFHPARMS = 2, /* FH parameter set */
IDSPARMS = 3, /* DS parameter set */
ICFPARMS = 4, /* CF parameter set */
ITIM = 5, /* Traffic Information Map */
IIBPARMS = 6, /* IBSS parameter set */
ICTEXT = 16, /* Challenge Text */
IERPINFO = 42, /* ERP Information */
IEXSUPRATES = 50, /* Extended Supported Rates */
IWAPI =68
} ELEMENTID_T;
/* Capability Information field bit assignments */
typedef enum {
ESS = 0x01, /* ESS capability */
IBSS = 0x02, /* IBSS mode */
POLLABLE = 0x04, /* CF Pollable */
POLLREQ = 0x08, /* Request to be polled */
PRIVACY = 0x10, /* WEP encryption supported */
SHORTPREAMBLE = 0x20, /* Short Preamble is supported */
SHORTSLOT = 0x400, /* Short Slot is supported */
PBCC = 0x40, /* PBCC */
CHANNELAGILITY = 0x80, /* Channel Agility */
SPECTRUM_MGMT = 0x100, /* Spectrum Management */
DSSS_OFDM = 0x2000 /* DSSS-OFDM */
} CAPABILITY_T;
/* BSS type */
typedef enum {
INFRASTRUCTURE = 1,
INDEPENDENT = 2,
ANY_BSS = 3
} BSSTYPE_T;
u8 *get_ie_elem(u8 * msa, ELEMENTID_T elm_id, u16 rx_len, u16 tag_param_offset)
{
u16 index = 0;
/*************************************************************************/
/* Beacon Frame - Frame Body */
/* --------------------------------------------------------------------- */
/* |Timestamp |BeaconInt |CapInfo |SSID |SupRates |DSParSet |TIM elm | */
/* --------------------------------------------------------------------- */
/* |8 |2 |2 |2-34 |3-10 |3 |4-256 | */
/* --------------------------------------------------------------------- */
/* */
/*************************************************************************/
index = tag_param_offset;
/* Search for the TIM Element Field and return if the element is found */
while(index < (rx_len - FCS_LEN)) {
if(msa[index] == elm_id){
return(&msa[index]);
}else{
index += (2 + msa[index + 1]);
}
}
return(0);
}
/* This function extracts the 'from ds' bit from the MAC header of the input */
/* frame. */
/* Returns the value in the LSB of the returned value. */
u8 get_from_ds(u8* header)
{
return ((header[1] & 0x02) >> 1);
}
/* This function extracts the 'to ds' bit from the MAC header of the input */
/* frame. */
/* Returns the value in the LSB of the returned value. */
u8 get_to_ds(u8* header)
{
return (header[1] & 0x01);
}
/* This function extracts the MAC Address in 'address1' field of the MAC */
/* header and updates the MAC Address in the allocated 'addr' variable. */
void get_address1(u8* msa, u8* addr)
{
memcpy(addr, msa + 4, 6);
}
/* This function extracts the MAC Address in 'address2' field of the MAC */
/* header and updates the MAC Address in the allocated 'addr' variable. */
void get_address2(u8* msa, u8* addr)
{
memcpy(addr, msa + 10, 6);
}
/* This function extracts the MAC Address in 'address3' field of the MAC */
/* header and updates the MAC Address in the allocated 'addr' variable. */
void get_address3(u8* msa, u8* addr)
{
memcpy(addr, msa + 16, 6);
}
/* This function extracts the BSSID from the incoming WLAN packet based on */
/* the 'from ds' bit, and updates the MAC Address in the allocated 'addr' */
/* variable. */
void get_BSSID(u8* data, u8* bssid)
{
if(get_from_ds(data) == 1)
get_address2(data, bssid);
else if(get_to_ds(data) == 1)
get_address1(data, bssid);
else
get_address3(data, bssid);
}
void wlan_network_information(wlan_private * priv, u8 * info, u16 info_len)
{
struct bss_descriptor *iter_bss;
struct bss_descriptor *bss = NULL;
unsigned char *pos, *end, *p;
unsigned char n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
struct ieee_ie_country_info_set *pcountryinfo;
unsigned char* msa = &info[9];
unsigned short msa_len = info[6] | (info[7] << 8);
#if 0
if(priv->scan_running == WLAN_SCAN_IDLE){
WLAN_ERRP("is not in scan process \n");
goto done;
}
#endif
if((msa_len - 1 + 9 ) != info_len){
WLAN_ERRP("rda5890_network_information verify lengh feild failed \n");
}
bss = kzalloc(sizeof(struct bss_descriptor), GFP_KERNEL);
if (bss == NULL) {
WLAN_ERRP("alloc bss_descriptor memory failed \n");
return;
}
memset(bss, 0, sizeof (struct bss_descriptor));
bss->rssi = info[8];
msa_len -= 1; // has rssi
get_BSSID(msa, bss->bssid);
end = msa + msa_len;
//mac head
pos = msa + 24;
//time stamp
pos += 8;
//beacon
bss->beaconperiod = *(pos) | (*(pos + 1) << 8);
pos += 2 ;
//capability
bss->capability = *(pos) | (*(pos + 1) << 8);
pos += 2;
if (bss->capability & WLAN_CAPABILITY_IBSS)
bss->mode = IW_MODE_ADHOC;
else
bss->mode = IW_MODE_INFRA;
/* process variable IE */
while (pos + 2 <= end) {
if (pos + pos[1] > end) {
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("process_bss: error in processing IE, "
"bytes left < IE length\n");
#endif
kfree(bss);
return;
}
switch (pos[0]) {
case WLAN_EID_SSID:
bss->ssid_len = min_t(int, IEEE80211_MAX_SSID_LEN, pos[1]);
memcpy(bss->ssid, pos + 2, bss->ssid_len);
if (priv->scan_ssid_len > 0) {
if (bss->ssid_len != priv->scan_ssid_len) {
kfree(bss);
return;
}
if (memcmp(bss->ssid, priv->scan_ssid, priv->scan_ssid_len)) {
kfree(bss);
return;
}
}
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got SSID IE: '%s', len %u %d\n",
bss->ssid, bss->ssid_len, pos[1]);
#endif
break;
case WLAN_EID_SUPP_RATES:
n_basic_rates = min_t(uint8_t, MAX_RATES, pos[1]);
memcpy(bss->rates, pos + 2, n_basic_rates);
got_basic_rates = 1;
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got RATES IE\n");
#endif
break;
case WLAN_EID_FH_PARAMS:
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got FH IE\n");
#endif
break;
case WLAN_EID_DS_PARAMS:
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got DS IE\n");
#endif
bss->channel = pos[2];
break;
case WLAN_EID_CF_PARAMS:
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got CF IE\n");
#endif
break;
case WLAN_EID_IBSS_PARAMS:
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got IBSS IE\n");
#endif
break;
case WLAN_EID_COUNTRY:
pcountryinfo = (struct ieee_ie_country_info_set *) pos;
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got COUNTRY IE\n");
#endif
break;
case WLAN_EID_EXT_SUPP_RATES:
/* only process extended supported rate if data rate is
* already found. Data rate IE should come before
* extended supported rate IE
*/
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got RATESEX IE\n");
#endif
if (!got_basic_rates) {
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("... but ignoring it\n");
#endif
break;
}
n_ex_rates = pos[1];
if (n_basic_rates + n_ex_rates > MAX_RATES)
n_ex_rates = MAX_RATES - n_basic_rates;
p = bss->rates + n_basic_rates;
memcpy(p, pos + 2, n_ex_rates);
break;
case WLAN_EID_GENERIC:
if (pos[1] >= 4 &&
pos[2] == 0x00 && pos[3] == 0x50 &&
pos[4] == 0xf2 && pos[5] == 0x01) {
bss->wpa_ie_len = min(pos[1] + 2, MAX_WPA_IE_LEN);
bss->wpa_ie = kzalloc(bss->wpa_ie_len, GFP_KERNEL);
if(bss->wpa_ie)
memcpy(bss->wpa_ie, pos, bss->wpa_ie_len);
else
bss->wpa_ie_len = 0;
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got WPA IE \n");
#endif
}
/* huanglei add for wps */
else if(pos[1] >= 4 &&
pos[2] == 0x00 && pos[3] == 0x50 &&
pos[4] == 0xf2 && pos[5] == 0x04 &&
(priv->version == WLAN_VERSION_91_E || priv->version == WLAN_VERSION_91_F)) {
bss->wps_ie_len = min(pos[1] + 2, MAX_WPS_IE_LEN);
bss->wps_ie = kzalloc(bss->wps_ie_len, GFP_KERNEL);
if(bss->wps_ie)
memcpy(bss->wps_ie, pos, bss->wps_ie_len);
else
bss->wps_ie_len = 0;
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got WPS IE \n");
#endif
}
else {
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got generic IE: %02x:%02x:%02x:%02x, len %d\n",
pos[2], pos[3], pos[4], pos[5], pos[1]);
#endif
}
break;
case WLAN_EID_RSN:
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got RSN IE\n");
#endif
bss->rsn_ie_len = min(pos[1] + 2, MAX_WPA_IE_LEN);
bss->rsn_ie = kzalloc(bss->rsn_ie_len, GFP_KERNEL);
if(bss->rsn_ie)
memcpy(bss->rsn_ie, pos, bss->rsn_ie_len);
else
bss->rsn_ie_len = 0;
break;
case IWAPI:
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("got WAPI IE\n");
#endif
bss->wapi_ie_len = min(pos[1] + 2, 100);
bss->wapi_ie = kzalloc(bss->wapi_ie_len, GFP_KERNEL);
if(bss->wapi_ie)
memcpy(bss->wapi_ie, pos, bss->wapi_ie_len);
else
bss->wapi_ie_len = 0;
break;
default:
break;
}
pos += pos[1] + 2;
}
bss->last_scanned = jiffies;
wlan_update_aver_rssi(priv, bss->bssid, bss->rssi);
/* add scaned bss into list */
if (1) {
struct bss_descriptor *found = NULL;
struct bss_descriptor *oldest = NULL;
struct bss_descriptor *unsed = NULL;
struct bss_descriptor *bss_lower_rssi = NULL;
s8 rssi = 0, lowRssi = 0;
spin_lock(&priv->ScanListLock);
/* Try to find this bss in the scan table */
list_for_each_entry(iter_bss, &priv->network_list, list) {
if (is_same_network(iter_bss, bss)) {
found = iter_bss;
break;
}
if (time_before(iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE, jiffies)) {
if(!oldest || (oldest->last_scanned > iter_bss->last_scanned))
oldest = iter_bss;
}
if (!iter_bss->ssid_len && unsed==NULL ) {
unsed=iter_bss;
break;
}
if(!is_zero_eth_addr(iter_bss->bssid)){
rssi = wlan_get_aver_rssi(priv, iter_bss->bssid);
if(bss_lower_rssi == NULL || rssi < lowRssi){
lowRssi = rssi;
bss_lower_rssi = iter_bss;
if(rssi == INVALID_RSSI)
break;
}
}
}
if (found) { // have in network list
WLAN_DBGLAP(WLAN_DA_WEXT, WLAN_DL_DEBUG, "FOUND SAME %s, update\n", found->ssid);
/* found, clear it */
clear_bss_descriptor(found);
memcpy(found, bss, offsetof(struct bss_descriptor, list));
} else { //not have in network list
if (unsed) {
WLAN_DBGLAP(WLAN_DA_WEXT, WLAN_DL_DEBUG,
"FOUND NEW %s, add\n", bss->ssid);
clear_bss_descriptor(unsed);
memcpy(unsed, bss, offsetof(struct bss_descriptor, list));
}else { // do not have space
if(oldest) { // have oldest
printk("**FOUND NEW %s, no space, replace oldest %s\n",
bss->ssid, oldest->ssid);
clear_bss_descriptor(oldest);
memcpy(oldest, bss, offsetof(struct bss_descriptor, list));
}else if (bss_lower_rssi) { // have lower rssi
printk("**FOUND NEW %s, no space, replace low_rssi %s\n",
bss->ssid, bss_lower_rssi->ssid);
clear_bss_descriptor(bss_lower_rssi);
memcpy(bss_lower_rssi, bss, offsetof(struct bss_descriptor, list));
}else { // don't have oldest
WLAN_DBGLAP(WLAN_DA_WEXT, WLAN_DL_CRIT, "Networklist Oldest is NULL\n");
}
}
}
spin_unlock(&priv->ScanListLock);
}
#ifdef SCAN_RESULT_DEBUG
WLAN_DBGP("rda5890_network_information .\n");
#endif
kfree(bss);
return;
}
void wlan_report_scan_result(wlan_private * priv)
{
union iwreq_data wrqu;
ENTER();
priv->scan_running = WLAN_SCAN_COMPLET;
memset(&wrqu, 0, sizeof(union iwreq_data));
wireless_send_event(priv->netDev, SIOCGIWSCAN, &wrqu, NULL);
wlan_mod_timer(&priv->CardToSleepTimer, 100);
LEAVE();
}
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