--- /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/module.h>
+#include <linux/init.h>
+#include <linux/kobject.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+
+#include <net/d80211.h>
+#include "ieee80211_i.h"
+#include "ieee80211_rate.h"
+#include "sta_info.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 struct sta_info *__sta_info_get(struct sta_info *sta)
+{
+ return kobject_get(&sta->kobj) ? sta : NULL;
+}
+
+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;
+ 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_put(struct sta_info *sta)
+{
+ kobject_put(&sta->kobj);
+}
+EXPORT_SYMBOL(sta_info_put);
+
+void sta_info_release(struct kobject *kobj)
+{
+ struct sta_info *sta = container_of(kobj, struct sta_info, kobj);
+ 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);
+ kfree(sta);
+}
+
+
+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;
+
+ if (kobject_set_name(&sta->kobj, MAC_FMT, MAC_ARG(addr))) {
+ kfree(sta);
+ return NULL;
+ }
+ sta->kobj.kset = &local->sta_kset;
+ kobject_init(&sta->kobj);
+
+ 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);
+ kobject_put(&sta->kobj);
+ 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_D80211_VERBOSE_DEBUG
+ printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
+ local->mdev->name, MAC_ARG(addr));
+#endif /* CONFIG_D80211_VERBOSE_DEBUG */
+
+ if (!in_interrupt()) {
+ sta->sysfs_registered = 1;
+ ieee80211_sta_sysfs_add(sta);
+ rate_control_add_sta_attrs(sta, &sta->kobj);
+ } 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;
+}
+
+static void finish_sta_info_free(struct ieee80211_local *local,
+ struct sta_info *sta)
+{
+#ifdef CONFIG_D80211_VERBOSE_DEBUG
+ printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
+ local->mdev->name, MAC_ARG(sta->addr));
+#endif /* CONFIG_D80211_VERBOSE_DEBUG */
+
+ if (sta->key) {
+ ieee80211_key_sysfs_remove(sta->key);
+ ieee80211_key_free(sta->key);
+ sta->key = NULL;
+ }
+
+ rate_control_remove_sta_attrs(sta, &sta->kobj);
+ ieee80211_sta_sysfs_remove(sta);
+
+ sta_info_put(sta);
+}
+
+void sta_info_free(struct sta_info *sta, int locked)
+{
+ struct sk_buff *skb;
+ struct ieee80211_local *local = sta->local;
+ 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->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;
+ }
+
+ if (in_atomic()) {
+ list_add(&sta->list, &local->deleted_sta_list);
+ schedule_work(&local->sta_proc_add);
+ } else
+ 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);
+}
+
+
+static void sta_info_proc_add_task(void *data)
+{
+ struct ieee80211_local *local = data;
+ 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->sysfs_registered) {
+ sta = tmp;
+ __sta_info_get(sta);
+ break;
+ }
+ }
+ spin_unlock_bh(&local->sta_lock);
+
+ if (!sta)
+ break;
+
+ sta->sysfs_registered = 1;
+ ieee80211_sta_sysfs_add(sta);
+ rate_control_add_sta_attrs(sta, &sta->kobj);
+ sta_info_put(sta);
+ }
+}
+
+
+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;
+
+ INIT_WORK(&local->sta_proc_add, sta_info_proc_add_task, local);
+}
+
+int sta_info_start(struct ieee80211_local *local)
+{
+ int res;
+
+ res = ieee80211_sta_kset_sysfs_register(local);
+ if (res)
+ return res;
+ 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 sysfs sta entries are
+ * unregistered. We don't need locking at this
+ * point. */
+ sta_info_free(sta, 0);
+ }
+ ieee80211_sta_kset_sysfs_unregister(local);
+}
+
+
+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->local, 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);
+}
projects / openwrt.git / blobdiff