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/*
* Copyright (c) 2004-2011 Atheros Communications Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "htc.h"
#include "wmi.h"
#include "debug.h"
struct bss *wlan_node_alloc(int wh_size)
{
struct bss *ni;
ni = kzalloc(sizeof(struct bss), GFP_ATOMIC);
if ((ni != NULL) && wh_size) {
ni->ni_buf = kmalloc(wh_size, GFP_ATOMIC);
if (ni->ni_buf == NULL) {
kfree(ni);
return NULL;
}
}
return ni;
}
void wlan_node_free(struct bss *ni)
{
kfree(ni->ni_buf);
kfree(ni);
}
void wlan_setup_node(struct ath6kl_node_table *nt, struct bss *ni,
const u8 *mac_addr)
{
int hash;
memcpy(ni->ni_macaddr, mac_addr, ETH_ALEN);
hash = ATH6KL_NODE_HASH(mac_addr);
ni->ni_refcnt = 1;
ni->ni_tstamp = jiffies_to_msecs(jiffies);
ni->ni_actcnt = WLAN_NODE_INACT_CNT;
spin_lock_bh(&nt->nt_nodelock);
/* 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 */
ni->ni_hash_next = nt->nt_hash[hash];
if (ni->ni_hash_next != NULL)
nt->nt_hash[hash]->ni_hash_prev = ni;
ni->ni_hash_prev = NULL;
nt->nt_hash[hash] = ni;
spin_unlock_bh(&nt->nt_nodelock);
}
struct bss *wlan_find_node(struct ath6kl_node_table *nt,
const u8 *mac_addr)
{
struct bss *ni, *found_ni = NULL;
int hash;
spin_lock_bh(&nt->nt_nodelock);
hash = ATH6KL_NODE_HASH(mac_addr);
for (ni = nt->nt_hash[hash]; ni; ni = ni->ni_hash_next) {
if (memcmp(ni->ni_macaddr, mac_addr, ETH_ALEN) == 0) {
ni->ni_refcnt++;
found_ni = ni;
break;
}
}
spin_unlock_bh(&nt->nt_nodelock);
return found_ni;
}
void wlan_node_reclaim(struct ath6kl_node_table *nt, struct bss *ni)
{
int hash;
spin_lock_bh(&nt->nt_nodelock);
if (ni->ni_list_prev == NULL)
/* fix 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)
/* 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 */
hash = ATH6KL_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);
spin_unlock_bh(&nt->nt_nodelock);
}
static void wlan_node_dec_free(struct bss *ni)
{
if ((ni->ni_refcnt--) == 1)
wlan_node_free(ni);
}
void wlan_free_allnodes(struct ath6kl_node_table *nt)
{
struct bss *ni;
while ((ni = nt->nt_node_first) != NULL)
wlan_node_reclaim(nt, ni);
}
void wlan_iterate_nodes(struct ath6kl_node_table *nt,
void (*f) (void *arg, struct bss *), void *arg)
{
struct bss *ni;
spin_lock_bh(&nt->nt_nodelock);
for (ni = nt->nt_node_first; ni; ni = ni->ni_list_next) {
ni->ni_refcnt++;
(*f) (arg, ni);
wlan_node_dec_free(ni);
}
spin_unlock_bh(&nt->nt_nodelock);
}
void wlan_node_table_init(void *wmi, struct ath6kl_node_table *nt)
{
ath6kl_dbg(ATH6KL_DBG_WLAN_NODE, "node table = 0x%lx\n",
(unsigned long)nt);
memset(nt, 0, sizeof(struct ath6kl_node_table));
spin_lock_init(&nt->nt_nodelock);
nt->nt_wmi = wmi;
nt->nt_node_age = WLAN_NODE_INACT_TIMEOUT_MSEC;
}
void wlan_refresh_inactive_nodes(struct ath6kl_node_table *nt)
{
struct bss *bss;
u8 my_bssid[ETH_ALEN];
u32 now;
ath6kl_wmi_get_current_bssid(nt->nt_wmi, my_bssid);
now = jiffies_to_msecs(jiffies);
bss = nt->nt_node_first;
while (bss != NULL) {
/* refresh all nodes except the current bss */
if (memcmp(my_bssid, bss->ni_macaddr, sizeof(my_bssid)) != 0) {
if (((now - bss->ni_tstamp) > nt->nt_node_age)
|| --bss->ni_actcnt == 0) {
wlan_node_reclaim(nt, bss);
}
}
bss = bss->ni_list_next;
}
}
void wlan_node_table_cleanup(struct ath6kl_node_table *nt)
{
wlan_free_allnodes(nt);
}
struct bss *wlan_find_ssid_node(struct ath6kl_node_table *nt, u8 * ssid,
u32 ssid_len, bool is_wpa2, bool match_ssid)
{
struct bss *ni, *found_ni = NULL;
u8 *ie_ssid;
spin_lock_bh(&nt->nt_nodelock);
for (ni = nt->nt_node_first; ni; ni = ni->ni_list_next) {
ie_ssid = ni->ni_cie.ie_ssid;
if ((ie_ssid[1] <= IEEE80211_MAX_SSID_LEN) &&
(memcmp(ssid, &ie_ssid[2], ssid_len) == 0)) {
if (match_ssid ||
(is_wpa2 && ni->ni_cie.ie_rsn != NULL) ||
(!is_wpa2 && ni->ni_cie.ie_wpa != NULL)) {
ni->ni_refcnt++;
found_ni = ni;
break;
}
}
}
spin_unlock_bh(&nt->nt_nodelock);
return found_ni;
}
void wlan_node_return(struct ath6kl_node_table *nt, struct bss *ni)
{
spin_lock_bh(&nt->nt_nodelock);
wlan_node_dec_free(ni);
spin_unlock_bh(&nt->nt_nodelock);
}
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