+++ /dev/null
-/*
- * Copyright 2002-2005, Instant802 Networks, Inc.
- *
- * 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/config.h>
-#include <linux/version.h>
-#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/ieee80211.h>
-#include "ieee80211_i.h"
-#include "ieee80211_proc.h"
-#include "rate_control.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 == NULL)
- return;
- if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
- local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
- return;
- }
-
- while (s->hnext != NULL &&
- memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
- s = s->hnext;
- if (s->hnext != NULL)
- s->hnext = s->hnext->hnext;
- else
- printk(KERN_ERR "%s: could not remove STA " MACSTR " from "
- "hash table\n", local->mdev->name, MAC2STR(sta->addr));
-}
-
-
-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) {
- atomic_inc(&sta->users);
- break;
- }
- sta = sta->hnext;
- }
- spin_unlock_bh(&local->sta_lock);
-
- return sta;
-}
-
-
-int sta_info_min_txrate_get(struct ieee80211_local *local)
-{
- struct sta_info *sta;
- int min_txrate = 9999999;
- int i;
-
- spin_lock_bh(&local->sta_lock);
- 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 min_txrate;
-}
-
-
-void sta_info_release(struct ieee80211_local *local, struct sta_info *sta)
-{
- struct sk_buff *skb;
-
- if (!atomic_dec_and_test(&sta->users))
- return;
-
- /* 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(local, sta->rate_ctrl_priv);
- kfree(sta);
-}
-
-
-struct sta_info * sta_info_add(struct ieee80211_local *local,
- struct net_device *dev, u8 *addr)
-{
- struct sta_info *sta;
-
- sta = kmalloc(sizeof(*sta), GFP_ATOMIC);
- if (!sta)
- return NULL;
-
- memset(sta, 0, sizeof(*sta));
-
- sta->rate_ctrl_priv = rate_control_alloc_sta(local);
- if (sta->rate_ctrl_priv == NULL) {
- kfree(sta);
- return NULL;
- }
-
- memcpy(sta->addr, addr, ETH_ALEN);
- sta->dev = dev;
- skb_queue_head_init(&sta->ps_tx_buf);
- skb_queue_head_init(&sta->tx_filtered);
- atomic_inc(&sta->users); /* sta in hashlist etc, decremented by
- * sta_info_free() */
- atomic_inc(&sta->users); /* sta used by caller, decremented by
- * sta_info_release() */
- 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->hw->sta_table_notification)
- local->hw->sta_table_notification(local->mdev, local->num_sta);
- sta->key_idx_compression = HW_KEY_IDX_INVALID;
-
-#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Added STA " MACSTR "\n",
- dev->name, MAC2STR(addr));
-#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
-
- if (!in_interrupt()) {
- ieee80211_proc_init_sta(local, sta);
- } else {
- /* procfs entry adding might sleep, so schedule process context
- * task for adding proc entry for STAs that do not yet have
- * one. */
- schedule_work(&local->sta_proc_add);
- }
-
- return sta;
-}
-
-
-void sta_info_free(struct ieee80211_local *local, struct sta_info *sta,
- int locked)
-{
- struct sk_buff *skb;
- struct ieee80211_sub_if_data *sdata;
-
- if (!locked)
- spin_lock_bh(&local->sta_lock);
- 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);
- if (!locked)
- spin_unlock_bh(&local->sta_lock);
- if (local->hw->sta_table_notification)
- local->hw->sta_table_notification(local->mdev, 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->hw->set_key) {
- struct ieee80211_key_conf *key;
- key = ieee80211_key_data2conf(local, sta->key);
- if (key) {
- local->hw->set_key(local->mdev, DISABLE_KEY,
- sta->addr, key, sta->aid);
- kfree(key);
- }
- }
- kfree(sta->key);
- sta->key = NULL;
- } 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.force_sw_encrypt = 1;
- local->hw->set_key(local->mdev, DISABLE_KEY, sta->addr, &conf,
- sta->aid);
- sta->key_idx_compression = HW_KEY_IDX_INVALID;
- }
-
-#ifdef CONFIG_IEEE80211_VERBOSE_DEBUG
- printk(KERN_DEBUG "%s: Removed STA " MACSTR "\n",
- local->mdev->name, MAC2STR(sta->addr));
-#endif /* CONFIG_IEEE80211_VERBOSE_DEBUG */
-
- ieee80211_proc_deinit_sta(local, sta);
-
- if (atomic_read(&sta->users) != 1) {
- /* This is OK, but printed for debugging. The station structure
- * will be removed when the other user of the data calls
- * sta_info_release(). */
- printk(KERN_DEBUG "%s: STA " MACSTR " users count %d when "
- "removing it\n", local->mdev->name, MAC2STR(sta->addr),
- atomic_read(&sta->users));
- }
-
- sta_info_release(local, sta);
-}
-
-
-static inline int sta_info_buffer_expired(struct sk_buff *skb)
-{
- struct ieee80211_tx_packet_data *pkt_data;
- if (!skb)
- return 0;
-
- /* TODO: this could be improved by passing STA listen interval into
- * the kernel driver and expiring frames after 2 x listen_interval x
- * beacon interval */
-
- pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
-
- if (pkt_data->magic != IEEE80211_CB_MAGIC)
- return 1;
-
- return time_after(jiffies, pkt_data->jiffies + STA_TX_BUFFER_EXPIRE);
-}
-
-
-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(skb))
- skb = __skb_dequeue(&sta->ps_tx_buf);
- 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 "
- MACSTR ")\n", MAC2STR(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 list_head *ptr;
-
- spin_lock_bh(&local->sta_lock);
- ptr = local->sta_list.next;
- while (ptr && ptr != &local->sta_list) {
- struct sta_info *sta = (struct sta_info *) ptr;
- atomic_inc(&sta->users);
- sta_info_cleanup_expire_buffered(local, sta);
- sta_info_release(local, sta);
- ptr = ptr->next;
- }
- spin_unlock_bh(&local->sta_lock);
-
- local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
- add_timer(&local->sta_cleanup);
-}
-
-
-static void sta_info_proc_add_task(void *data)
-{
- struct ieee80211_local *local = data;
- struct list_head *ptr;
- struct sta_info *sta;
- int max_adds = 100;
-
- while (max_adds > 0) {
- sta = NULL;
- spin_lock_bh(&local->sta_lock);
- list_for_each(ptr, &local->sta_list) {
- sta = list_entry(ptr, struct sta_info, list);
- if (!sta->proc_entry_added) {
- atomic_inc(&sta->users);
- break;
- }
- sta = NULL;
- }
- spin_unlock_bh(&local->sta_lock);
-
- if (!sta)
- break;
-
- ieee80211_proc_init_sta(local, sta);
- atomic_dec(&sta->users);
-
- max_adds--;
- }
-}
-
-
-void sta_info_init(struct ieee80211_local *local)
-{
- spin_lock_init(&local->sta_lock);
- INIT_LIST_HEAD(&local->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;
-
- INIT_WORK(&local->sta_proc_add, sta_info_proc_add_task, local);
-}
-
-void sta_info_start(struct ieee80211_local *local)
-{
- add_timer(&local->sta_cleanup);
-}
-
-void sta_info_stop(struct ieee80211_local *local)
-{
- struct list_head *ptr;
-
- del_timer(&local->sta_cleanup);
-
- ptr = local->sta_list.next;
- while (ptr && ptr != &local->sta_list) {
- struct sta_info *sta = (struct sta_info *) ptr;
- ptr = ptr->next;
- sta_info_free(local, sta, 0);
- }
-}
-
-
-void sta_info_remove_aid_ptr(struct sta_info *sta)
-{
- struct ieee80211_sub_if_data *sdata;
-
- sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
- if (sta->aid <= 0 || !sdata->bss)
- return;
-
- sdata->bss->sta_aid[sta->aid - 1] = NULL;
- if (sta->aid == sdata->bss->max_aid) {
- while (sdata->bss->max_aid > 0 &&
- sdata->bss->sta_aid[sdata->bss->max_aid - 1] == NULL)
- sdata->bss->max_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 list_head *ptr, *n;
-
- spin_lock_bh(&local->sta_lock);
-
- list_for_each_safe(ptr, n, &local->sta_list) {
- struct sta_info *sta = list_entry(ptr, struct sta_info, list);
- if (dev == NULL || dev == sta->dev)
- sta_info_free(local, sta, 1);
- }
- spin_unlock_bh(&local->sta_lock);
-}
projects / openwrt / staging / mkresin.git / blobdiff