947 lines
26 KiB
C
947 lines
26 KiB
C
/*
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "driver-ops.h"
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#include "rate.h"
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#include "sta_info.h"
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#include "debugfs_sta.h"
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#include "mesh.h"
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/**
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* DOC: STA information lifetime rules
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*
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* STA info structures (&struct sta_info) are managed in a hash table
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* for faster lookup and a list for iteration. They are managed using
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* RCU, i.e. access to the list and hash table is protected by RCU.
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*
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* Upon allocating a STA info structure with sta_info_alloc(), the caller owns
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* that structure. It must then either destroy it using sta_info_destroy()
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* (which is pretty useless) or insert it into the hash table using
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* sta_info_insert() which demotes the reference from ownership to a regular
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* RCU-protected reference; if the function is called without protection by an
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* RCU critical section the reference is instantly invalidated. Note that the
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* caller may not do much with the STA info before inserting it, in particular,
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* it may not start any mesh peer link management or add encryption keys.
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*
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* When the insertion fails (sta_info_insert()) returns non-zero), the
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* structure will have been freed by sta_info_insert()!
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*
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* sta entries are added by mac80211 when you establish a link with a
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* peer. This means different things for the different type of interfaces
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* we support. For a regular station this mean we add the AP sta when we
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* receive an assocation response from the AP. For IBSS this occurs when
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* we receive a probe response or a beacon from target IBSS network. For
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* WDS we add the sta for the peer imediately upon device open. When using
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* AP mode we add stations for each respective station upon request from
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* userspace through nl80211.
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*
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* Because there are debugfs entries for each station, and adding those
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* must be able to sleep, it is also possible to "pin" a station entry,
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* that means it can be removed from the hash table but not be freed.
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* See the comment in __sta_info_unlink() for more information, this is
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* an internal capability only.
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*
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* In order to remove a STA info structure, the caller needs to first
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* unlink it (sta_info_unlink()) from the list and hash tables and
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* then destroy it; sta_info_destroy() will wait for an RCU grace period
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* to elapse before actually freeing it. Due to the pinning and the
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* possibility of multiple callers trying to remove the same STA info at
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* the same time, sta_info_unlink() can clear the STA info pointer it is
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* passed to indicate that the STA info is owned by somebody else now.
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*
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* If sta_info_unlink() did not clear the pointer then the caller owns
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* the STA info structure now and is responsible of destroying it with
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* a call to sta_info_destroy().
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*
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* In all other cases, there is no concept of ownership on a STA entry,
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* each structure is owned by the global hash table/list until it is
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* removed. All users of the structure need to be RCU protected so that
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* the structure won't be freed before they are done using it.
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*/
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/* Caller must hold local->sta_lock */
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static int sta_info_hash_del(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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struct sta_info *s;
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s = local->sta_hash[STA_HASH(sta->sta.addr)];
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if (!s)
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return -ENOENT;
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if (s == sta) {
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rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
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s->hnext);
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return 0;
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}
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while (s->hnext && s->hnext != sta)
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s = s->hnext;
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if (s->hnext) {
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rcu_assign_pointer(s->hnext, sta->hnext);
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return 0;
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}
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return -ENOENT;
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}
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/* protected by RCU */
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struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
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{
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struct sta_info *sta;
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sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
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while (sta) {
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if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
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break;
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sta = rcu_dereference(sta->hnext);
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}
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return sta;
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}
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struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
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struct net_device *dev)
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{
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struct sta_info *sta;
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int i = 0;
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list_for_each_entry_rcu(sta, &local->sta_list, list) {
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if (dev && dev != sta->sdata->dev)
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continue;
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if (i < idx) {
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++i;
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continue;
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}
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return sta;
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}
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return NULL;
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}
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/**
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* __sta_info_free - internal STA free helper
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*
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* @local: pointer to the global information
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* @sta: STA info to free
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*
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* This function must undo everything done by sta_info_alloc()
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* that may happen before sta_info_insert().
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*/
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static void __sta_info_free(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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rate_control_free_sta(sta);
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rate_control_put(sta->rate_ctrl);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
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wiphy_name(local->hw.wiphy), sta->sta.addr);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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kfree(sta);
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}
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void sta_info_destroy(struct sta_info *sta)
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{
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struct ieee80211_local *local;
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struct sk_buff *skb;
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int i;
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might_sleep();
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if (!sta)
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return;
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local = sta->local;
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cancel_work_sync(&sta->drv_unblock_wk);
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rate_control_remove_sta_debugfs(sta);
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ieee80211_sta_debugfs_remove(sta);
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#ifdef CONFIG_MAC80211_MESH
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if (ieee80211_vif_is_mesh(&sta->sdata->vif))
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mesh_plink_deactivate(sta);
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#endif
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/*
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* We have only unlinked the key, and actually destroying it
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* may mean it is removed from hardware which requires that
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* the key->sta pointer is still valid, so flush the key todo
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* list here.
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*
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* ieee80211_key_todo() will synchronize_rcu() so after this
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* nothing can reference this sta struct any more.
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*/
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ieee80211_key_todo();
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#ifdef CONFIG_MAC80211_MESH
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if (ieee80211_vif_is_mesh(&sta->sdata->vif))
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del_timer_sync(&sta->plink_timer);
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#endif
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while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
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local->total_ps_buffered--;
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dev_kfree_skb_any(skb);
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}
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while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
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dev_kfree_skb_any(skb);
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for (i = 0; i < STA_TID_NUM; i++) {
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struct tid_ampdu_rx *tid_rx;
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struct tid_ampdu_tx *tid_tx;
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spin_lock_bh(&sta->lock);
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tid_rx = sta->ampdu_mlme.tid_rx[i];
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/* Make sure timer won't free the tid_rx struct, see below */
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if (tid_rx)
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tid_rx->shutdown = true;
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spin_unlock_bh(&sta->lock);
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/*
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* Outside spinlock - shutdown is true now so that the timer
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* won't free tid_rx, we have to do that now. Can't let the
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* timer do it because we have to sync the timer outside the
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* lock that it takes itself.
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*/
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if (tid_rx) {
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del_timer_sync(&tid_rx->session_timer);
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kfree(tid_rx);
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}
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/*
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* No need to do such complications for TX agg sessions, the
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* path leading to freeing the tid_tx struct goes via a call
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* from the driver, and thus needs to look up the sta struct
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* again, which cannot be found when we get here. Hence, we
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* just need to delete the timer and free the aggregation
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* info; we won't be telling the peer about it then but that
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* doesn't matter if we're not talking to it again anyway.
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*/
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tid_tx = sta->ampdu_mlme.tid_tx[i];
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if (tid_tx) {
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del_timer_sync(&tid_tx->addba_resp_timer);
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/*
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* STA removed while aggregation session being
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* started? Bit odd, but purge frames anyway.
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*/
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skb_queue_purge(&tid_tx->pending);
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kfree(tid_tx);
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}
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}
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__sta_info_free(local, sta);
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}
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/* Caller must hold local->sta_lock */
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static void sta_info_hash_add(struct ieee80211_local *local,
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struct sta_info *sta)
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{
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sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
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rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
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}
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static void sta_unblock(struct work_struct *wk)
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{
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struct sta_info *sta;
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sta = container_of(wk, struct sta_info, drv_unblock_wk);
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if (sta->dead)
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return;
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if (!test_sta_flags(sta, WLAN_STA_PS_STA))
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ieee80211_sta_ps_deliver_wakeup(sta);
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else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL))
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ieee80211_sta_ps_deliver_poll_response(sta);
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}
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struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
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u8 *addr, gfp_t gfp)
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{
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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int i;
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sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
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if (!sta)
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return NULL;
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spin_lock_init(&sta->lock);
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spin_lock_init(&sta->flaglock);
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INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
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memcpy(sta->sta.addr, addr, ETH_ALEN);
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sta->local = local;
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sta->sdata = sdata;
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sta->rate_ctrl = rate_control_get(local->rate_ctrl);
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sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
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&sta->sta, gfp);
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if (!sta->rate_ctrl_priv) {
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rate_control_put(sta->rate_ctrl);
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kfree(sta);
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return NULL;
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}
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for (i = 0; i < STA_TID_NUM; i++) {
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/* timer_to_tid must be initialized with identity mapping to
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* enable session_timer's data differentiation. refer to
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* sta_rx_agg_session_timer_expired for useage */
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sta->timer_to_tid[i] = i;
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/* rx */
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sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
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sta->ampdu_mlme.tid_rx[i] = NULL;
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/* tx */
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sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
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sta->ampdu_mlme.tid_tx[i] = NULL;
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sta->ampdu_mlme.addba_req_num[i] = 0;
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}
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skb_queue_head_init(&sta->ps_tx_buf);
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skb_queue_head_init(&sta->tx_filtered);
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for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
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sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: Allocated STA %pM\n",
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wiphy_name(local->hw.wiphy), sta->sta.addr);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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#ifdef CONFIG_MAC80211_MESH
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sta->plink_state = PLINK_LISTEN;
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init_timer(&sta->plink_timer);
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#endif
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return sta;
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}
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int sta_info_insert(struct sta_info *sta)
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{
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struct ieee80211_local *local = sta->local;
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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unsigned long flags;
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int err = 0;
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/*
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* Can't be a WARN_ON because it can be triggered through a race:
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* something inserts a STA (on one CPU) without holding the RTNL
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* and another CPU turns off the net device.
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*/
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if (unlikely(!netif_running(sdata->dev))) {
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err = -ENETDOWN;
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goto out_free;
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}
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if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
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is_multicast_ether_addr(sta->sta.addr))) {
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err = -EINVAL;
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goto out_free;
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}
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spin_lock_irqsave(&local->sta_lock, flags);
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/* check if STA exists already */
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if (sta_info_get(local, sta->sta.addr)) {
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spin_unlock_irqrestore(&local->sta_lock, flags);
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err = -EEXIST;
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goto out_free;
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}
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list_add(&sta->list, &local->sta_list);
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local->sta_generation++;
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local->num_sta++;
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sta_info_hash_add(local, sta);
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/* notify driver */
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if (local->ops->sta_notify) {
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if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
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sdata = container_of(sdata->bss,
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struct ieee80211_sub_if_data,
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u.ap);
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drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, &sta->sta);
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sdata = sta->sdata;
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}
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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printk(KERN_DEBUG "%s: Inserted STA %pM\n",
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wiphy_name(local->hw.wiphy), sta->sta.addr);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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spin_unlock_irqrestore(&local->sta_lock, flags);
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#ifdef CONFIG_MAC80211_DEBUGFS
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/*
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* Debugfs entry adding might sleep, so schedule process
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* context task for adding entry for STAs that do not yet
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* have one.
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* NOTE: due to auto-freeing semantics this may only be done
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* if the insertion is successful!
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*/
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schedule_work(&local->sta_debugfs_add);
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#endif
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if (ieee80211_vif_is_mesh(&sdata->vif))
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mesh_accept_plinks_update(sdata);
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return 0;
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out_free:
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BUG_ON(!err);
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__sta_info_free(local, sta);
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return err;
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}
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static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
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{
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/*
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* This format has been mandated by the IEEE specifications,
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* so this line may not be changed to use the __set_bit() format.
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*/
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bss->tim[aid / 8] |= (1 << (aid % 8));
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}
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static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
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{
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/*
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* This format has been mandated by the IEEE specifications,
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* so this line may not be changed to use the __clear_bit() format.
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*/
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bss->tim[aid / 8] &= ~(1 << (aid % 8));
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}
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static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
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struct sta_info *sta)
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{
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BUG_ON(!bss);
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__bss_tim_set(bss, sta->sta.aid);
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if (sta->local->ops->set_tim) {
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sta->local->tim_in_locked_section = true;
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drv_set_tim(sta->local, &sta->sta, true);
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sta->local->tim_in_locked_section = false;
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}
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}
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|
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void sta_info_set_tim_bit(struct sta_info *sta)
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{
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unsigned long flags;
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BUG_ON(!sta->sdata->bss);
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spin_lock_irqsave(&sta->local->sta_lock, flags);
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__sta_info_set_tim_bit(sta->sdata->bss, sta);
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spin_unlock_irqrestore(&sta->local->sta_lock, flags);
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}
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static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
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struct sta_info *sta)
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{
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BUG_ON(!bss);
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__bss_tim_clear(bss, sta->sta.aid);
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if (sta->local->ops->set_tim) {
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sta->local->tim_in_locked_section = true;
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drv_set_tim(sta->local, &sta->sta, false);
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sta->local->tim_in_locked_section = false;
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}
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}
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|
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void sta_info_clear_tim_bit(struct sta_info *sta)
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{
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unsigned long flags;
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|
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BUG_ON(!sta->sdata->bss);
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spin_lock_irqsave(&sta->local->sta_lock, flags);
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__sta_info_clear_tim_bit(sta->sdata->bss, sta);
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spin_unlock_irqrestore(&sta->local->sta_lock, flags);
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}
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|
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static void __sta_info_unlink(struct sta_info **sta)
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{
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struct ieee80211_local *local = (*sta)->local;
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struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
|
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/*
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* pull caller's reference if we're already gone.
|
|
*/
|
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if (sta_info_hash_del(local, *sta)) {
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*sta = NULL;
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return;
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}
|
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|
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if ((*sta)->key) {
|
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ieee80211_key_free((*sta)->key);
|
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WARN_ON((*sta)->key);
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}
|
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|
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list_del(&(*sta)->list);
|
|
(*sta)->dead = true;
|
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|
|
if (test_and_clear_sta_flags(*sta,
|
|
WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
|
|
BUG_ON(!sdata->bss);
|
|
|
|
atomic_dec(&sdata->bss->num_sta_ps);
|
|
__sta_info_clear_tim_bit(sdata->bss, *sta);
|
|
}
|
|
|
|
local->num_sta--;
|
|
local->sta_generation++;
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
rcu_assign_pointer(sdata->u.vlan.sta, NULL);
|
|
|
|
if (local->ops->sta_notify) {
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
sdata = container_of(sdata->bss,
|
|
struct ieee80211_sub_if_data,
|
|
u.ap);
|
|
|
|
drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
|
|
&(*sta)->sta);
|
|
sdata = (*sta)->sdata;
|
|
}
|
|
|
|
if (ieee80211_vif_is_mesh(&sdata->vif)) {
|
|
mesh_accept_plinks_update(sdata);
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
del_timer(&(*sta)->plink_timer);
|
|
#endif
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: Removed STA %pM\n",
|
|
wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
|
|
/*
|
|
* Finally, pull caller's reference if the STA is pinned by the
|
|
* task that is adding the debugfs entries. In that case, we
|
|
* leave the STA "to be freed".
|
|
*
|
|
* The rules are not trivial, but not too complex either:
|
|
* (1) pin_status is only modified under the sta_lock
|
|
* (2) STAs may only be pinned under the RTNL so that
|
|
* sta_info_flush() is guaranteed to actually destroy
|
|
* all STAs that are active for a given interface, this
|
|
* is required for correctness because otherwise we
|
|
* could notify a driver that an interface is going
|
|
* away and only after that (!) notify it about a STA
|
|
* on that interface going away.
|
|
* (3) sta_info_debugfs_add_work() will set the status
|
|
* to PINNED when it found an item that needs a new
|
|
* debugfs directory created. In that case, that item
|
|
* must not be freed although all *RCU* users are done
|
|
* with it. Hence, we tell the caller of _unlink()
|
|
* that the item is already gone (as can happen when
|
|
* two tasks try to unlink/destroy at the same time)
|
|
* (4) We set the pin_status to DESTROY here when we
|
|
* find such an item.
|
|
* (5) sta_info_debugfs_add_work() will reset the pin_status
|
|
* from PINNED to NORMAL when it is done with the item,
|
|
* but will check for DESTROY before resetting it in
|
|
* which case it will free the item.
|
|
*/
|
|
if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
|
|
(*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
|
|
*sta = NULL;
|
|
return;
|
|
}
|
|
}
|
|
|
|
void sta_info_unlink(struct sta_info **sta)
|
|
{
|
|
struct ieee80211_local *local = (*sta)->local;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
__sta_info_unlink(sta);
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
}
|
|
|
|
static int sta_info_buffer_expired(struct sta_info *sta,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_tx_info *info;
|
|
int timeout;
|
|
|
|
if (!skb)
|
|
return 0;
|
|
|
|
info = IEEE80211_SKB_CB(skb);
|
|
|
|
/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
|
|
timeout = (sta->listen_interval *
|
|
sta->sdata->vif.bss_conf.beacon_int *
|
|
32 / 15625) * HZ;
|
|
if (timeout < STA_TX_BUFFER_EXPIRE)
|
|
timeout = STA_TX_BUFFER_EXPIRE;
|
|
return time_after(jiffies, info->control.jiffies + timeout);
|
|
}
|
|
|
|
|
|
static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
|
|
struct sta_info *sta)
|
|
{
|
|
unsigned long flags;
|
|
struct sk_buff *skb;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
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(sta, skb))
|
|
skb = __skb_dequeue(&sta->ps_tx_buf);
|
|
else
|
|
skb = NULL;
|
|
spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
|
|
|
|
if (!skb)
|
|
break;
|
|
|
|
sdata = sta->sdata;
|
|
local->total_ps_buffered--;
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
|
|
sta->sta.addr);
|
|
#endif
|
|
dev_kfree_skb(skb);
|
|
|
|
if (skb_queue_empty(&sta->ps_tx_buf))
|
|
sta_info_clear_tim_bit(sta);
|
|
}
|
|
}
|
|
|
|
|
|
static void sta_info_cleanup(unsigned long data)
|
|
{
|
|
struct ieee80211_local *local = (struct ieee80211_local *) data;
|
|
struct sta_info *sta;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sta, &local->sta_list, list)
|
|
sta_info_cleanup_expire_buffered(local, sta);
|
|
rcu_read_unlock();
|
|
|
|
if (local->quiescing)
|
|
return;
|
|
|
|
local->sta_cleanup.expires =
|
|
round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
|
|
add_timer(&local->sta_cleanup);
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
/*
|
|
* See comment in __sta_info_unlink,
|
|
* caller must hold local->sta_lock.
|
|
*/
|
|
static void __sta_info_pin(struct sta_info *sta)
|
|
{
|
|
WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
|
|
sta->pin_status = STA_INFO_PIN_STAT_PINNED;
|
|
}
|
|
|
|
/*
|
|
* See comment in __sta_info_unlink, returns sta if it
|
|
* needs to be destroyed.
|
|
*/
|
|
static struct sta_info *__sta_info_unpin(struct sta_info *sta)
|
|
{
|
|
struct sta_info *ret = NULL;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&sta->local->sta_lock, flags);
|
|
WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
|
|
sta->pin_status != STA_INFO_PIN_STAT_PINNED);
|
|
if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
|
|
ret = sta;
|
|
sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
|
|
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sta_info_debugfs_add_work(struct work_struct *work)
|
|
{
|
|
struct ieee80211_local *local =
|
|
container_of(work, struct ieee80211_local, sta_debugfs_add);
|
|
struct sta_info *sta, *tmp;
|
|
unsigned long flags;
|
|
|
|
/* We need to keep the RTNL across the whole pinned status. */
|
|
rtnl_lock();
|
|
while (1) {
|
|
sta = NULL;
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
list_for_each_entry(tmp, &local->sta_list, list) {
|
|
/*
|
|
* debugfs.add_has_run will be set by
|
|
* ieee80211_sta_debugfs_add regardless
|
|
* of what else it does.
|
|
*/
|
|
if (!tmp->debugfs.add_has_run) {
|
|
sta = tmp;
|
|
__sta_info_pin(sta);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
|
|
if (!sta)
|
|
break;
|
|
|
|
ieee80211_sta_debugfs_add(sta);
|
|
rate_control_add_sta_debugfs(sta);
|
|
|
|
sta = __sta_info_unpin(sta);
|
|
sta_info_destroy(sta);
|
|
}
|
|
rtnl_unlock();
|
|
}
|
|
#endif
|
|
|
|
void sta_info_init(struct ieee80211_local *local)
|
|
{
|
|
spin_lock_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_work);
|
|
#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);
|
|
#ifdef CONFIG_MAC80211_DEBUGFS
|
|
/*
|
|
* Make sure the debugfs adding work isn't pending after this
|
|
* because we're about to be destroyed. It doesn't matter
|
|
* whether it ran or not since we're going to flush all STAs
|
|
* anyway.
|
|
*/
|
|
cancel_work_sync(&local->sta_debugfs_add);
|
|
#endif
|
|
|
|
sta_info_flush(local, NULL);
|
|
}
|
|
|
|
/**
|
|
* sta_info_flush - flush matching STA entries from the STA table
|
|
*
|
|
* Returns the number of removed STA entries.
|
|
*
|
|
* @local: local interface data
|
|
* @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
|
|
*/
|
|
int sta_info_flush(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct sta_info *sta, *tmp;
|
|
LIST_HEAD(tmp_list);
|
|
int ret = 0;
|
|
unsigned long flags;
|
|
|
|
might_sleep();
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
|
|
if (!sdata || sdata == sta->sdata) {
|
|
__sta_info_unlink(&sta);
|
|
if (sta) {
|
|
list_add_tail(&sta->list, &tmp_list);
|
|
ret++;
|
|
}
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
|
|
list_for_each_entry_safe(sta, tmp, &tmp_list, list)
|
|
sta_info_destroy(sta);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
|
|
unsigned long exp_time)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta, *tmp;
|
|
LIST_HEAD(tmp_list);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
|
|
if (time_after(jiffies, sta->last_rx + exp_time)) {
|
|
#ifdef CONFIG_MAC80211_IBSS_DEBUG
|
|
printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
|
|
sdata->dev->name, sta->sta.addr);
|
|
#endif
|
|
__sta_info_unlink(&sta);
|
|
if (sta)
|
|
list_add(&sta->list, &tmp_list);
|
|
}
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
|
|
list_for_each_entry_safe(sta, tmp, &tmp_list, list)
|
|
sta_info_destroy(sta);
|
|
}
|
|
|
|
struct ieee80211_sta *ieee80211_find_sta_by_hw(struct ieee80211_hw *hw,
|
|
const u8 *addr)
|
|
{
|
|
struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
|
|
|
|
if (!sta)
|
|
return NULL;
|
|
return &sta->sta;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_hw);
|
|
|
|
struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
|
|
const u8 *addr)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
if (!vif)
|
|
return NULL;
|
|
|
|
sdata = vif_to_sdata(vif);
|
|
|
|
return ieee80211_find_sta_by_hw(&sdata->local->hw, addr);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_find_sta);
|
|
|
|
/* powersave support code */
|
|
void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
int sent, buffered;
|
|
|
|
drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta);
|
|
|
|
if (!skb_queue_empty(&sta->ps_tx_buf))
|
|
sta_info_clear_tim_bit(sta);
|
|
|
|
/* Send all buffered frames to the station */
|
|
sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
|
|
buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
|
|
sent += buffered;
|
|
local->total_ps_buffered -= buffered;
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
|
|
"since STA not sleeping anymore\n", sdata->dev->name,
|
|
sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
}
|
|
|
|
void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
int no_pending_pkts;
|
|
|
|
skb = skb_dequeue(&sta->tx_filtered);
|
|
if (!skb) {
|
|
skb = skb_dequeue(&sta->ps_tx_buf);
|
|
if (skb)
|
|
local->total_ps_buffered--;
|
|
}
|
|
no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
|
|
skb_queue_empty(&sta->ps_tx_buf);
|
|
|
|
if (skb) {
|
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
|
|
struct ieee80211_hdr *hdr =
|
|
(struct ieee80211_hdr *) skb->data;
|
|
|
|
/*
|
|
* Tell TX path to send this frame even though the STA may
|
|
* still remain is PS mode after this frame exchange.
|
|
*/
|
|
info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
|
|
sta->sta.addr, sta->sta.aid,
|
|
skb_queue_len(&sta->ps_tx_buf));
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
|
|
/* Use MoreData flag to indicate whether there are more
|
|
* buffered frames for this STA */
|
|
if (no_pending_pkts)
|
|
hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
|
|
else
|
|
hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
|
|
|
|
ieee80211_add_pending_skb(local, skb);
|
|
|
|
if (no_pending_pkts)
|
|
sta_info_clear_tim_bit(sta);
|
|
#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
|
|
} else {
|
|
/*
|
|
* FIXME: This can be the result of a race condition between
|
|
* us expiring a frame and the station polling for it.
|
|
* Should we send it a null-func frame indicating we
|
|
* have nothing buffered for it?
|
|
*/
|
|
printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
|
|
"though there are no buffered frames for it\n",
|
|
sdata->dev->name, sta->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
|
|
}
|
|
}
|
|
|
|
void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
|
|
struct ieee80211_sta *pubsta, bool block)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
|
|
if (block)
|
|
set_sta_flags(sta, WLAN_STA_PS_DRIVER);
|
|
else
|
|
ieee80211_queue_work(hw, &sta->drv_unblock_wk);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sta_block_awake);
|