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openwrt-xburst/target/linux/s3c24xx/files-2.6.31/drivers/ar6000/wlan/wlan_node.c

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2004 Sam Leffler, Errno Consulting
* Copyright (c) 2004-2005 Atheros Communications
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: //depot/sw/releases/olca2.0-GPL/host/wlan/src/wlan_node.c#1 $
*/
/*
* IEEE 802.11 node handling support.
*/
#include <a_config.h>
#include <athdefs.h>
#include <a_types.h>
#include <a_osapi.h>
#include <a_debug.h>
#include <ieee80211.h>
#include <wlan_api.h>
#include <ieee80211_node.h>
#include <htc_api.h>
#include <wmi.h>
#include <wmi_api.h>
static void wlan_node_timeout(A_ATH_TIMER arg);
static bss_t * _ieee80211_find_node(struct ieee80211_node_table *nt,
const A_UINT8 *macaddr);
bss_t *
wlan_node_alloc(struct ieee80211_node_table *nt, int wh_size)
{
bss_t *ni;
ni = A_MALLOC_NOWAIT(sizeof(bss_t));
if (ni != NULL) {
ni->ni_buf = A_MALLOC_NOWAIT(wh_size);
if (ni->ni_buf == NULL) {
A_FREE(ni);
ni = NULL;
return ni;
}
} else {
return ni;
}
/* Make sure our lists are clean */
ni->ni_list_next = NULL;
ni->ni_list_prev = NULL;
ni->ni_hash_next = NULL;
ni->ni_hash_prev = NULL;
//
// ni_scangen never initialized before and during suspend/resume of winmobile, customer (LG/SEMCO) identified
// that some junk has been stored in this, due to this scan list didn't properly updated
//
ni->ni_scangen = 0;
return ni;
}
void
wlan_node_free(bss_t *ni)
{
if (ni->ni_buf != NULL) {
A_FREE(ni->ni_buf);
}
A_FREE(ni);
}
void
wlan_setup_node(struct ieee80211_node_table *nt, bss_t *ni,
const A_UINT8 *macaddr)
{
int hash;
A_MEMCPY(ni->ni_macaddr, macaddr, IEEE80211_ADDR_LEN);
hash = IEEE80211_NODE_HASH(macaddr);
ieee80211_node_initref(ni); /* mark referenced */
ni->ni_tstamp = A_GET_MS(WLAN_NODE_INACT_TIMEOUT_MSEC);
IEEE80211_NODE_LOCK_BH(nt);
/* Insert at the end of the node list */
ni->ni_list_next = NULL;
ni->ni_list_prev = nt->nt_node_last;
if(nt->nt_node_last != NULL)
{
nt->nt_node_last->ni_list_next = ni;
}
nt->nt_node_last = ni;
if(nt->nt_node_first == NULL)
{
nt->nt_node_first = ni;
}
/* Insert into the hash list i.e. the bucket */
if((ni->ni_hash_next = nt->nt_hash[hash]) != NULL)
{
nt->nt_hash[hash]->ni_hash_prev = ni;
}
ni->ni_hash_prev = NULL;
nt->nt_hash[hash] = ni;
if (!nt->isTimerArmed) {
A_TIMEOUT_MS(&nt->nt_inact_timer, WLAN_NODE_INACT_TIMEOUT_MSEC, 0);
nt->isTimerArmed = TRUE;
}
IEEE80211_NODE_UNLOCK_BH(nt);
}
static bss_t *
_ieee80211_find_node(struct ieee80211_node_table *nt,
const A_UINT8 *macaddr)
{
bss_t *ni;
int hash;
IEEE80211_NODE_LOCK_ASSERT(nt);
hash = IEEE80211_NODE_HASH(macaddr);
for(ni = nt->nt_hash[hash]; ni; ni = ni->ni_hash_next) {
if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
ieee80211_node_incref(ni); /* mark referenced */
return ni;
}
}
return NULL;
}
bss_t *
wlan_find_node(struct ieee80211_node_table *nt, const A_UINT8 *macaddr)
{
bss_t *ni;
IEEE80211_NODE_LOCK(nt);
ni = _ieee80211_find_node(nt, macaddr);
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
/*
* Reclaim a node. If this is the last reference count then
* do the normal free work. Otherwise remove it from the node
* table and mark it gone by clearing the back-reference.
*/
void
wlan_node_reclaim(struct ieee80211_node_table *nt, bss_t *ni)
{
IEEE80211_NODE_LOCK(nt);
if(ni->ni_list_prev == NULL)
{
/* First in list so fix the list head */
nt->nt_node_first = ni->ni_list_next;
}
else
{
ni->ni_list_prev->ni_list_next = ni->ni_list_next;
}
if(ni->ni_list_next == NULL)
{
/* Last in list so fix list tail */
nt->nt_node_last = ni->ni_list_prev;
}
else
{
ni->ni_list_next->ni_list_prev = ni->ni_list_prev;
}
if(ni->ni_hash_prev == NULL)
{
/* First in list so fix the list head */
int hash;
hash = IEEE80211_NODE_HASH(ni->ni_macaddr);
nt->nt_hash[hash] = ni->ni_hash_next;
}
else
{
ni->ni_hash_prev->ni_hash_next = ni->ni_hash_next;
}
if(ni->ni_hash_next != NULL)
{
ni->ni_hash_next->ni_hash_prev = ni->ni_hash_prev;
}
wlan_node_free(ni);
IEEE80211_NODE_UNLOCK(nt);
}
static void
wlan_node_dec_free(bss_t *ni)
{
if (ieee80211_node_dectestref(ni)) {
wlan_node_free(ni);
}
}
void
wlan_free_allnodes(struct ieee80211_node_table *nt)
{
bss_t *ni;
while ((ni = nt->nt_node_first) != NULL) {
wlan_node_reclaim(nt, ni);
}
}
void
wlan_iterate_nodes(struct ieee80211_node_table *nt, wlan_node_iter_func *f,
void *arg)
{
bss_t *ni;
A_UINT32 gen;
gen = ++nt->nt_scangen;
IEEE80211_NODE_LOCK(nt);
for (ni = nt->nt_node_first; ni; ni = ni->ni_list_next) {
if (ni->ni_scangen != gen) {
ni->ni_scangen = gen;
(void) ieee80211_node_incref(ni);
(*f)(arg, ni);
wlan_node_dec_free(ni);
}
}
IEEE80211_NODE_UNLOCK(nt);
}
/*
* Node table support.
*/
void
wlan_node_table_init(void *wmip, struct ieee80211_node_table *nt)
{
int i;
AR_DEBUG_PRINTF(ATH_DEBUG_WLAN, ("node table = 0x%x\n", (A_UINT32)nt));
IEEE80211_NODE_LOCK_INIT(nt);
nt->nt_node_first = nt->nt_node_last = NULL;
for(i = 0; i < IEEE80211_NODE_HASHSIZE; i++)
{
nt->nt_hash[i] = NULL;
}
A_INIT_TIMER(&nt->nt_inact_timer, wlan_node_timeout, nt);
nt->isTimerArmed = FALSE;
nt->nt_wmip = wmip;
}
static void
wlan_node_timeout(A_ATH_TIMER arg)
{
struct ieee80211_node_table *nt = (struct ieee80211_node_table *)arg;
bss_t *bss, *nextBss;
A_UINT8 myBssid[IEEE80211_ADDR_LEN], reArmTimer = FALSE;
wmi_get_current_bssid(nt->nt_wmip, myBssid);
bss = nt->nt_node_first;
while (bss != NULL)
{
nextBss = bss->ni_list_next;
if (A_MEMCMP(myBssid, bss->ni_macaddr, sizeof(myBssid)) != 0)
{
if (bss->ni_tstamp <= A_GET_MS(0))
{
/*
* free up all but the current bss - if set
*/
wlan_node_reclaim(nt, bss);
}
else
{
/*
* Re-arm timer, only when we have a bss other than
* current bss AND it is not aged-out.
*/
reArmTimer = TRUE;
}
}
bss = nextBss;
}
if(reArmTimer)
A_TIMEOUT_MS(&nt->nt_inact_timer, WLAN_NODE_INACT_TIMEOUT_MSEC, 0);
nt->isTimerArmed = reArmTimer;
}
void
wlan_node_table_cleanup(struct ieee80211_node_table *nt)
{
A_UNTIMEOUT(&nt->nt_inact_timer);
A_DELETE_TIMER(&nt->nt_inact_timer);
wlan_free_allnodes(nt);
IEEE80211_NODE_LOCK_DESTROY(nt);
}
bss_t *
wlan_find_Ssidnode (struct ieee80211_node_table *nt, A_UCHAR *pSsid,
A_UINT32 ssidLength, A_BOOL bIsWPA2)
{
bss_t *ni = NULL;
A_UCHAR *pIESsid = NULL;
IEEE80211_NODE_LOCK (nt);
for (ni = nt->nt_node_first; ni; ni = ni->ni_list_next) {
pIESsid = ni->ni_cie.ie_ssid;
if (pIESsid[1] <= 32) {
// Step 1 : Check SSID
if (0x00 == memcmp (pSsid, &pIESsid[2], ssidLength)) {
// Step 2 : if SSID matches, check WPA or WPA2
if (TRUE == bIsWPA2 && NULL != ni->ni_cie.ie_rsn) {
ieee80211_node_incref (ni); /* mark referenced */
IEEE80211_NODE_UNLOCK (nt);
return ni;
}
if (FALSE == bIsWPA2 && NULL != ni->ni_cie.ie_wpa) {
ieee80211_node_incref(ni); /* mark referenced */
IEEE80211_NODE_UNLOCK (nt);
return ni;
}
}
}
}
IEEE80211_NODE_UNLOCK (nt);
return NULL;
}
void
wlan_node_return (struct ieee80211_node_table *nt, bss_t *ni)
{
IEEE80211_NODE_LOCK (nt);
wlan_node_dec_free (ni);
IEEE80211_NODE_UNLOCK (nt);
}