| /* |
| * 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 <linux/timer.h> |
| |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "ieee80211_rate.h" |
| #include "sta_info.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 int 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 -ENOENT; |
| if (s == sta) { |
| local->sta_hash[STA_HASH(sta->addr)] = s->hnext; |
| return 0; |
| } |
| |
| while (s->hnext && s->hnext != sta) |
| s = s->hnext; |
| if (s->hnext) { |
| s->hnext = sta->hnext; |
| return 0; |
| } |
| |
| return -ENOENT; |
| } |
| |
| struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr) |
| { |
| struct sta_info *sta; |
| |
| read_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; |
| } |
| read_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; |
| |
| read_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; |
| } |
| } |
| read_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; |
| int i; |
| |
| /* 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); |
| } |
| for (i = 0; i < STA_TID_NUM; i++) |
| del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer); |
| rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv); |
| rate_control_put(sta->rate_ctrl); |
| 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; |
| int i; |
| DECLARE_MAC_BUF(mac); |
| |
| 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); |
| kfree(sta); |
| return NULL; |
| } |
| |
| memcpy(sta->addr, addr, ETH_ALEN); |
| sta->local = local; |
| sta->dev = dev; |
| spin_lock_init(&sta->ampdu_mlme.ampdu_rx); |
| for (i = 0; i < STA_TID_NUM; i++) { |
| /* timer_to_tid must be initialized with identity mapping to |
| * enable session_timer's data differentiation. refer to |
| * sta_rx_agg_session_timer_expired for useage */ |
| sta->timer_to_tid[i] = i; |
| /* rx timers */ |
| sta->ampdu_mlme.tid_rx[i].session_timer.function = |
| sta_rx_agg_session_timer_expired; |
| sta->ampdu_mlme.tid_rx[i].session_timer.data = |
| (unsigned long)&sta->timer_to_tid[i]; |
| init_timer(&sta->ampdu_mlme.tid_rx[i].session_timer); |
| } |
| 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() */ |
| write_lock_bh(&local->sta_lock); |
| list_add(&sta->list, &local->sta_list); |
| local->num_sta++; |
| sta_info_hash_add(local, sta); |
| if (local->ops->sta_notify) { |
| struct ieee80211_sub_if_data *sdata; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
| sdata = sdata->u.vlan.ap; |
| |
| local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
| STA_NOTIFY_ADD, addr); |
| } |
| write_unlock_bh(&local->sta_lock); |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| printk(KERN_DEBUG "%s: Added STA %s\n", |
| wiphy_name(local->hw.wiphy), print_mac(mac, addr)); |
| #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| |
| #ifdef CONFIG_MAC80211_DEBUGFS |
| /* 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; |
| } |
| |
| /* Caller must hold local->sta_lock */ |
| void sta_info_remove(struct sta_info *sta) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata; |
| |
| /* don't do anything if we've been removed already */ |
| if (sta_info_hash_del(local, sta)) |
| return; |
| |
| 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) |
| { |
| struct sk_buff *skb; |
| struct ieee80211_local *local = sta->local; |
| DECLARE_MAC_BUF(mac); |
| |
| might_sleep(); |
| |
| write_lock_bh(&local->sta_lock); |
| sta_info_remove(sta); |
| write_unlock_bh(&local->sta_lock); |
| |
| while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { |
| local->total_ps_buffered--; |
| dev_kfree_skb(skb); |
| } |
| while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) { |
| dev_kfree_skb(skb); |
| } |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| printk(KERN_DEBUG "%s: Removed STA %s\n", |
| wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr)); |
| #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| |
| ieee80211_key_free(sta->key); |
| sta->key = NULL; |
| |
| if (local->ops->sta_notify) { |
| struct ieee80211_sub_if_data *sdata; |
| |
| sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev); |
| |
| if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
| sdata = sdata->u.vlan.ap; |
| |
| local->ops->sta_notify(local_to_hw(local), &sdata->vif, |
| STA_NOTIFY_REMOVE, sta->addr); |
| } |
| |
| rate_control_remove_sta_debugfs(sta); |
| ieee80211_sta_debugfs_remove(sta); |
| |
| sta_info_put(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; |
| DECLARE_MAC_BUF(mac); |
| |
| 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 " |
| "%s)\n", print_mac(mac, 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; |
| |
| read_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); |
| } |
| read_unlock_bh(&local->sta_lock); |
| |
| local->sta_cleanup.expires = |
| round_jiffies(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) { |
| sta = NULL; |
| read_lock_bh(&local->sta_lock); |
| list_for_each_entry(tmp, &local->sta_list, list) { |
| if (!tmp->debugfs.dir) { |
| sta = tmp; |
| __sta_info_get(sta); |
| break; |
| } |
| } |
| read_unlock_bh(&local->sta_lock); |
| |
| if (!sta) |
| break; |
| |
| ieee80211_sta_debugfs_add(sta); |
| rate_control_add_sta_debugfs(sta); |
| sta_info_put(sta); |
| } |
| } |
| #endif |
| |
| void sta_info_init(struct ieee80211_local *local) |
| { |
| rwlock_init(&local->sta_lock); |
| INIT_LIST_HEAD(&local->sta_list); |
| |
| setup_timer(&local->sta_cleanup, sta_info_cleanup, |
| (unsigned long)local); |
| local->sta_cleanup.expires = |
| round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); |
| |
| #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) |
| { |
| del_timer(&local->sta_cleanup); |
| sta_info_flush(local, NULL); |
| } |
| |
| 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; |
| LIST_HEAD(tmp_list); |
| |
| write_lock_bh(&local->sta_lock); |
| list_for_each_entry_safe(sta, tmp, &local->sta_list, list) |
| if (!dev || dev == sta->dev) { |
| __sta_info_get(sta); |
| sta_info_remove(sta); |
| list_add_tail(&sta->list, &tmp_list); |
| } |
| write_unlock_bh(&local->sta_lock); |
| |
| list_for_each_entry_safe(sta, tmp, &tmp_list, list) { |
| sta_info_free(sta); |
| sta_info_put(sta); |
| } |
| } |