linux/net/mac80211/sta_info.c

471 lines
12 KiB
C

/*
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "ieee80211_rate.h"
#include "sta_info.h"
#include "debugfs_key.h"
#include "debugfs_sta.h"
/* Caller must hold local->sta_lock */
static void sta_info_hash_add(struct ieee80211_local *local,
struct sta_info *sta)
{
sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
local->sta_hash[STA_HASH(sta->addr)] = sta;
}
/* Caller must hold local->sta_lock */
static void sta_info_hash_del(struct ieee80211_local *local,
struct sta_info *sta)
{
struct sta_info *s;
s = local->sta_hash[STA_HASH(sta->addr)];
if (!s)
return;
if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
return;
}
while (s->hnext && memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
s = s->hnext;
if (s->hnext)
s->hnext = s->hnext->hnext;
else
printk(KERN_ERR "%s: could not remove STA " MAC_FMT " from "
"hash table\n", local->mdev->name, MAC_ARG(sta->addr));
}
static inline void __sta_info_get(struct sta_info *sta)
{
kref_get(&sta->kref);
}
struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
{
struct sta_info *sta;
spin_lock_bh(&local->sta_lock);
sta = local->sta_hash[STA_HASH(addr)];
while (sta) {
if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
__sta_info_get(sta);
break;
}
sta = sta->hnext;
}
spin_unlock_bh(&local->sta_lock);
return sta;
}
EXPORT_SYMBOL(sta_info_get);
int sta_info_min_txrate_get(struct ieee80211_local *local)
{
struct sta_info *sta;
struct ieee80211_hw_mode *mode;
int min_txrate = 9999999;
int i;
spin_lock_bh(&local->sta_lock);
mode = local->oper_hw_mode;
for (i = 0; i < STA_HASH_SIZE; i++) {
sta = local->sta_hash[i];
while (sta) {
if (sta->txrate < min_txrate)
min_txrate = sta->txrate;
sta = sta->hnext;
}
}
spin_unlock_bh(&local->sta_lock);
if (min_txrate == 9999999)
min_txrate = 0;
return mode->rates[min_txrate].rate;
}
static void sta_info_release(struct kref *kref)
{
struct sta_info *sta = container_of(kref, struct sta_info, kref);
struct ieee80211_local *local = sta->local;
struct sk_buff *skb;
/* free sta structure; it has already been removed from
* hash table etc. external structures. Make sure that all
* buffered frames are release (one might have been added
* after sta_info_free() was called). */
while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
local->total_ps_buffered--;
dev_kfree_skb_any(skb);
}
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
dev_kfree_skb_any(skb);
}
rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
rate_control_put(sta->rate_ctrl);
if (sta->key)
ieee80211_debugfs_key_sta_del(sta->key, sta);
kfree(sta);
}
void sta_info_put(struct sta_info *sta)
{
kref_put(&sta->kref, sta_info_release);
}
EXPORT_SYMBOL(sta_info_put);
struct sta_info * sta_info_add(struct ieee80211_local *local,
struct net_device *dev, u8 *addr, gfp_t gfp)
{
struct sta_info *sta;
sta = kzalloc(sizeof(*sta), gfp);
if (!sta)
return NULL;
kref_init(&sta->kref);
sta->rate_ctrl = rate_control_get(local->rate_ctrl);
sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
if (!sta->rate_ctrl_priv) {
rate_control_put(sta->rate_ctrl);
kref_put(&sta->kref, sta_info_release);
kfree(sta);
return NULL;
}
memcpy(sta->addr, addr, ETH_ALEN);
sta->local = local;
sta->dev = dev;
skb_queue_head_init(&sta->ps_tx_buf);
skb_queue_head_init(&sta->tx_filtered);
__sta_info_get(sta); /* sta used by caller, decremented by
* sta_info_put() */
spin_lock_bh(&local->sta_lock);
list_add(&sta->list, &local->sta_list);
local->num_sta++;
sta_info_hash_add(local, sta);
spin_unlock_bh(&local->sta_lock);
if (local->ops->sta_table_notification)
local->ops->sta_table_notification(local_to_hw(local),
local->num_sta);
sta->key_idx_compression = HW_KEY_IDX_INVALID;
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
local->mdev->name, MAC_ARG(addr));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
#ifdef CONFIG_MAC80211_DEBUGFS
if (!in_interrupt()) {
sta->debugfs_registered = 1;
ieee80211_sta_debugfs_add(sta);
rate_control_add_sta_debugfs(sta);
} else {
/* debugfs entry adding might sleep, so schedule process
* context task for adding entry for STAs that do not yet
* have one. */
queue_work(local->hw.workqueue, &local->sta_debugfs_add);
}
#endif
return sta;
}
static void finish_sta_info_free(struct ieee80211_local *local,
struct sta_info *sta)
{
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
local->mdev->name, MAC_ARG(sta->addr));
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
if (sta->key) {
ieee80211_debugfs_key_remove(sta->key);
ieee80211_key_free(sta->key);
sta->key = NULL;
}
rate_control_remove_sta_debugfs(sta);
ieee80211_sta_debugfs_remove(sta);
sta_info_put(sta);
}
static void sta_info_remove(struct sta_info *sta)
{
struct ieee80211_local *local = sta->local;
struct ieee80211_sub_if_data *sdata;
sta_info_hash_del(local, sta);
list_del(&sta->list);
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
if (sta->flags & WLAN_STA_PS) {
sta->flags &= ~WLAN_STA_PS;
if (sdata->bss)
atomic_dec(&sdata->bss->num_sta_ps);
}
local->num_sta--;
sta_info_remove_aid_ptr(sta);
}
void sta_info_free(struct sta_info *sta, int locked)
{
struct sk_buff *skb;
struct ieee80211_local *local = sta->local;
if (!locked) {
spin_lock_bh(&local->sta_lock);
sta_info_remove(sta);
spin_unlock_bh(&local->sta_lock);
} else {
sta_info_remove(sta);
}
if (local->ops->sta_table_notification)
local->ops->sta_table_notification(local_to_hw(local),
local->num_sta);
while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
local->total_ps_buffered--;
dev_kfree_skb_any(skb);
}
while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
dev_kfree_skb_any(skb);
}
if (sta->key) {
if (local->ops->set_key) {
struct ieee80211_key_conf *key;
key = ieee80211_key_data2conf(local, sta->key);
if (key) {
local->ops->set_key(local_to_hw(local),
DISABLE_KEY,
sta->addr, key, sta->aid);
kfree(key);
}
}
} else if (sta->key_idx_compression != HW_KEY_IDX_INVALID) {
struct ieee80211_key_conf conf;
memset(&conf, 0, sizeof(conf));
conf.hw_key_idx = sta->key_idx_compression;
conf.alg = ALG_NULL;
conf.flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
local->ops->set_key(local_to_hw(local), DISABLE_KEY,
sta->addr, &conf, sta->aid);
sta->key_idx_compression = HW_KEY_IDX_INVALID;
}
#ifdef CONFIG_MAC80211_DEBUGFS
if (in_atomic()) {
list_add(&sta->list, &local->deleted_sta_list);
queue_work(local->hw.workqueue, &local->sta_debugfs_add);
} else
#endif
finish_sta_info_free(local, sta);
}
static inline int sta_info_buffer_expired(struct ieee80211_local *local,
struct sta_info *sta,
struct sk_buff *skb)
{
struct ieee80211_tx_packet_data *pkt_data;
int timeout;
if (!skb)
return 0;
pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
15625) * HZ;
if (timeout < STA_TX_BUFFER_EXPIRE)
timeout = STA_TX_BUFFER_EXPIRE;
return time_after(jiffies, pkt_data->jiffies + timeout);
}
static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
struct sta_info *sta)
{
unsigned long flags;
struct sk_buff *skb;
if (skb_queue_empty(&sta->ps_tx_buf))
return;
for (;;) {
spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
skb = skb_peek(&sta->ps_tx_buf);
if (sta_info_buffer_expired(local, sta, skb)) {
skb = __skb_dequeue(&sta->ps_tx_buf);
if (skb_queue_empty(&sta->ps_tx_buf))
sta->flags &= ~WLAN_STA_TIM;
} else
skb = NULL;
spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
if (skb) {
local->total_ps_buffered--;
printk(KERN_DEBUG "Buffered frame expired (STA "
MAC_FMT ")\n", MAC_ARG(sta->addr));
dev_kfree_skb(skb);
} else
break;
}
}
static void sta_info_cleanup(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *) data;
struct sta_info *sta;
spin_lock_bh(&local->sta_lock);
list_for_each_entry(sta, &local->sta_list, list) {
__sta_info_get(sta);
sta_info_cleanup_expire_buffered(local, sta);
sta_info_put(sta);
}
spin_unlock_bh(&local->sta_lock);
local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
add_timer(&local->sta_cleanup);
}
#ifdef CONFIG_MAC80211_DEBUGFS
static void sta_info_debugfs_add_task(struct work_struct *work)
{
struct ieee80211_local *local =
container_of(work, struct ieee80211_local, sta_debugfs_add);
struct sta_info *sta, *tmp;
while (1) {
spin_lock_bh(&local->sta_lock);
if (!list_empty(&local->deleted_sta_list)) {
sta = list_entry(local->deleted_sta_list.next,
struct sta_info, list);
list_del(local->deleted_sta_list.next);
} else
sta = NULL;
spin_unlock_bh(&local->sta_lock);
if (!sta)
break;
finish_sta_info_free(local, sta);
}
while (1) {
sta = NULL;
spin_lock_bh(&local->sta_lock);
list_for_each_entry(tmp, &local->sta_list, list) {
if (!tmp->debugfs_registered) {
sta = tmp;
__sta_info_get(sta);
break;
}
}
spin_unlock_bh(&local->sta_lock);
if (!sta)
break;
sta->debugfs_registered = 1;
ieee80211_sta_debugfs_add(sta);
rate_control_add_sta_debugfs(sta);
sta_info_put(sta);
}
}
#endif
void sta_info_init(struct ieee80211_local *local)
{
spin_lock_init(&local->sta_lock);
INIT_LIST_HEAD(&local->sta_list);
INIT_LIST_HEAD(&local->deleted_sta_list);
init_timer(&local->sta_cleanup);
local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
local->sta_cleanup.data = (unsigned long) local;
local->sta_cleanup.function = sta_info_cleanup;
#ifdef CONFIG_MAC80211_DEBUGFS
INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
#endif
}
int sta_info_start(struct ieee80211_local *local)
{
add_timer(&local->sta_cleanup);
return 0;
}
void sta_info_stop(struct ieee80211_local *local)
{
struct sta_info *sta, *tmp;
del_timer(&local->sta_cleanup);
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
/* sta_info_free must be called with 0 as the last
* parameter to ensure all debugfs sta entries are
* unregistered. We don't need locking at this
* point. */
sta_info_free(sta, 0);
}
}
void sta_info_remove_aid_ptr(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata;
if (sta->aid <= 0)
return;
sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
if (sdata->local->ops->set_tim)
sdata->local->ops->set_tim(local_to_hw(sdata->local),
sta->aid, 0);
if (sdata->bss)
__bss_tim_clear(sdata->bss, sta->aid);
}
/**
* sta_info_flush - flush matching STA entries from the STA table
* @local: local interface data
* @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
*/
void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
{
struct sta_info *sta, *tmp;
spin_lock_bh(&local->sta_lock);
list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
if (!dev || dev == sta->dev)
sta_info_free(sta, 1);
spin_unlock_bh(&local->sta_lock);
}