mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
730c30ec64
Conflicts: drivers/net/wireless/iwlwifi/iwl-core.c drivers/net/wireless/iwlwifi/iwl-sta.c
833 lines
22 KiB
C
833 lines
22 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 <linux/timer.h>
|
|
#include <linux/rtnetlink.h>
|
|
|
|
#include <net/mac80211.h>
|
|
#include "ieee80211_i.h"
|
|
#include "rate.h"
|
|
#include "sta_info.h"
|
|
#include "debugfs_sta.h"
|
|
#include "mesh.h"
|
|
|
|
/**
|
|
* DOC: STA information lifetime rules
|
|
*
|
|
* STA info structures (&struct sta_info) are managed in a hash table
|
|
* for faster lookup and a list for iteration. They are managed using
|
|
* RCU, i.e. access to the list and hash table is protected by RCU.
|
|
*
|
|
* Upon allocating a STA info structure with sta_info_alloc(), the caller owns
|
|
* that structure. It must then either destroy it using sta_info_destroy()
|
|
* (which is pretty useless) or insert it into the hash table using
|
|
* sta_info_insert() which demotes the reference from ownership to a regular
|
|
* RCU-protected reference; if the function is called without protection by an
|
|
* RCU critical section the reference is instantly invalidated. Note that the
|
|
* caller may not do much with the STA info before inserting it, in particular,
|
|
* it may not start any mesh peer link management or add encryption keys.
|
|
*
|
|
* When the insertion fails (sta_info_insert()) returns non-zero), the
|
|
* structure will have been freed by sta_info_insert()!
|
|
*
|
|
* Because there are debugfs entries for each station, and adding those
|
|
* must be able to sleep, it is also possible to "pin" a station entry,
|
|
* that means it can be removed from the hash table but not be freed.
|
|
* See the comment in __sta_info_unlink() for more information, this is
|
|
* an internal capability only.
|
|
*
|
|
* In order to remove a STA info structure, the caller needs to first
|
|
* unlink it (sta_info_unlink()) from the list and hash tables and
|
|
* then destroy it; sta_info_destroy() will wait for an RCU grace period
|
|
* to elapse before actually freeing it. Due to the pinning and the
|
|
* possibility of multiple callers trying to remove the same STA info at
|
|
* the same time, sta_info_unlink() can clear the STA info pointer it is
|
|
* passed to indicate that the STA info is owned by somebody else now.
|
|
*
|
|
* If sta_info_unlink() did not clear the pointer then the caller owns
|
|
* the STA info structure now and is responsible of destroying it with
|
|
* a call to sta_info_destroy().
|
|
*
|
|
* In all other cases, there is no concept of ownership on a STA entry,
|
|
* each structure is owned by the global hash table/list until it is
|
|
* removed. All users of the structure need to be RCU protected so that
|
|
* the structure won't be freed before they are done using it.
|
|
*/
|
|
|
|
/* 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->sta.addr)];
|
|
if (!s)
|
|
return -ENOENT;
|
|
if (s == sta) {
|
|
rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
|
|
s->hnext);
|
|
return 0;
|
|
}
|
|
|
|
while (s->hnext && s->hnext != sta)
|
|
s = s->hnext;
|
|
if (s->hnext) {
|
|
rcu_assign_pointer(s->hnext, sta->hnext);
|
|
return 0;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
/* protected by RCU */
|
|
struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
|
|
sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
|
|
while (sta) {
|
|
if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
|
|
break;
|
|
sta = rcu_dereference(sta->hnext);
|
|
}
|
|
return sta;
|
|
}
|
|
|
|
struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
|
|
struct net_device *dev)
|
|
{
|
|
struct sta_info *sta;
|
|
int i = 0;
|
|
|
|
list_for_each_entry_rcu(sta, &local->sta_list, list) {
|
|
if (dev && dev != sta->sdata->dev)
|
|
continue;
|
|
if (i < idx) {
|
|
++i;
|
|
continue;
|
|
}
|
|
return sta;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* __sta_info_free - internal STA free helper
|
|
*
|
|
* @local: pointer to the global information
|
|
* @sta: STA info to free
|
|
*
|
|
* This function must undo everything done by sta_info_alloc()
|
|
* that may happen before sta_info_insert().
|
|
*/
|
|
static void __sta_info_free(struct ieee80211_local *local,
|
|
struct sta_info *sta)
|
|
{
|
|
rate_control_free_sta(sta);
|
|
rate_control_put(sta->rate_ctrl);
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
|
|
wiphy_name(local->hw.wiphy), sta->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
|
|
kfree(sta);
|
|
}
|
|
|
|
void sta_info_destroy(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local;
|
|
struct sk_buff *skb;
|
|
int i;
|
|
|
|
might_sleep();
|
|
|
|
if (!sta)
|
|
return;
|
|
|
|
local = sta->local;
|
|
|
|
rate_control_remove_sta_debugfs(sta);
|
|
ieee80211_sta_debugfs_remove(sta);
|
|
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
if (ieee80211_vif_is_mesh(&sta->sdata->vif))
|
|
mesh_plink_deactivate(sta);
|
|
#endif
|
|
|
|
/*
|
|
* We have only unlinked the key, and actually destroying it
|
|
* may mean it is removed from hardware which requires that
|
|
* the key->sta pointer is still valid, so flush the key todo
|
|
* list here.
|
|
*
|
|
* ieee80211_key_todo() will synchronize_rcu() so after this
|
|
* nothing can reference this sta struct any more.
|
|
*/
|
|
ieee80211_key_todo();
|
|
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
if (ieee80211_vif_is_mesh(&sta->sdata->vif))
|
|
del_timer_sync(&sta->plink_timer);
|
|
#endif
|
|
|
|
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++) {
|
|
spin_lock_bh(&sta->lock);
|
|
if (sta->ampdu_mlme.tid_rx[i])
|
|
del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer);
|
|
if (sta->ampdu_mlme.tid_tx[i])
|
|
del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer);
|
|
spin_unlock_bh(&sta->lock);
|
|
}
|
|
|
|
__sta_info_free(local, sta);
|
|
}
|
|
|
|
|
|
/* 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->sta.addr)];
|
|
rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
|
|
}
|
|
|
|
struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
|
|
u8 *addr, gfp_t gfp)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta;
|
|
int i;
|
|
|
|
sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
|
|
if (!sta)
|
|
return NULL;
|
|
|
|
spin_lock_init(&sta->lock);
|
|
spin_lock_init(&sta->flaglock);
|
|
|
|
memcpy(sta->sta.addr, addr, ETH_ALEN);
|
|
sta->local = local;
|
|
sta->sdata = sdata;
|
|
|
|
sta->rate_ctrl = rate_control_get(local->rate_ctrl);
|
|
sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
|
|
&sta->sta, gfp);
|
|
if (!sta->rate_ctrl_priv) {
|
|
rate_control_put(sta->rate_ctrl);
|
|
kfree(sta);
|
|
return NULL;
|
|
}
|
|
|
|
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;
|
|
/* tid to tx queue: initialize according to HW (0 is valid) */
|
|
sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw);
|
|
/* rx */
|
|
sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
|
|
sta->ampdu_mlme.tid_rx[i] = NULL;
|
|
/* tx */
|
|
sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
|
|
sta->ampdu_mlme.tid_tx[i] = NULL;
|
|
sta->ampdu_mlme.addba_req_num[i] = 0;
|
|
}
|
|
skb_queue_head_init(&sta->ps_tx_buf);
|
|
skb_queue_head_init(&sta->tx_filtered);
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: Allocated STA %pM\n",
|
|
wiphy_name(local->hw.wiphy), sta->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
sta->plink_state = PLINK_LISTEN;
|
|
init_timer(&sta->plink_timer);
|
|
#endif
|
|
|
|
return sta;
|
|
}
|
|
|
|
int sta_info_insert(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
unsigned long flags;
|
|
int err = 0;
|
|
|
|
/*
|
|
* Can't be a WARN_ON because it can be triggered through a race:
|
|
* something inserts a STA (on one CPU) without holding the RTNL
|
|
* and another CPU turns off the net device.
|
|
*/
|
|
if (unlikely(!netif_running(sdata->dev))) {
|
|
err = -ENETDOWN;
|
|
goto out_free;
|
|
}
|
|
|
|
if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
|
|
is_multicast_ether_addr(sta->sta.addr))) {
|
|
err = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
/* check if STA exists already */
|
|
if (sta_info_get(local, sta->sta.addr)) {
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
err = -EEXIST;
|
|
goto out_free;
|
|
}
|
|
list_add(&sta->list, &local->sta_list);
|
|
local->num_sta++;
|
|
sta_info_hash_add(local, sta);
|
|
|
|
/* notify driver */
|
|
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);
|
|
|
|
local->ops->sta_notify(local_to_hw(local), &sdata->vif,
|
|
STA_NOTIFY_ADD, &sta->sta);
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
printk(KERN_DEBUG "%s: Inserted STA %pM\n",
|
|
wiphy_name(local->hw.wiphy), sta->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
|
|
#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.
|
|
* NOTE: due to auto-freeing semantics this may only be done
|
|
* if the insertion is successful!
|
|
*/
|
|
schedule_work(&local->sta_debugfs_add);
|
|
#endif
|
|
|
|
if (ieee80211_vif_is_mesh(&sdata->vif))
|
|
mesh_accept_plinks_update(sdata);
|
|
|
|
return 0;
|
|
out_free:
|
|
BUG_ON(!err);
|
|
__sta_info_free(local, sta);
|
|
return err;
|
|
}
|
|
|
|
static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
|
|
{
|
|
/*
|
|
* This format has been mandated by the IEEE specifications,
|
|
* so this line may not be changed to use the __set_bit() format.
|
|
*/
|
|
bss->tim[aid / 8] |= (1 << (aid % 8));
|
|
}
|
|
|
|
static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
|
|
{
|
|
/*
|
|
* This format has been mandated by the IEEE specifications,
|
|
* so this line may not be changed to use the __clear_bit() format.
|
|
*/
|
|
bss->tim[aid / 8] &= ~(1 << (aid % 8));
|
|
}
|
|
|
|
static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
|
|
struct sta_info *sta)
|
|
{
|
|
BUG_ON(!bss);
|
|
|
|
__bss_tim_set(bss, sta->sta.aid);
|
|
|
|
if (sta->local->ops->set_tim) {
|
|
sta->local->tim_in_locked_section = true;
|
|
sta->local->ops->set_tim(local_to_hw(sta->local),
|
|
&sta->sta, true);
|
|
sta->local->tim_in_locked_section = false;
|
|
}
|
|
}
|
|
|
|
void sta_info_set_tim_bit(struct sta_info *sta)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!sta->sdata->bss);
|
|
|
|
spin_lock_irqsave(&sta->local->sta_lock, flags);
|
|
__sta_info_set_tim_bit(sta->sdata->bss, sta);
|
|
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
|
|
}
|
|
|
|
static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
|
|
struct sta_info *sta)
|
|
{
|
|
BUG_ON(!bss);
|
|
|
|
__bss_tim_clear(bss, sta->sta.aid);
|
|
|
|
if (sta->local->ops->set_tim) {
|
|
sta->local->tim_in_locked_section = true;
|
|
sta->local->ops->set_tim(local_to_hw(sta->local),
|
|
&sta->sta, false);
|
|
sta->local->tim_in_locked_section = false;
|
|
}
|
|
}
|
|
|
|
void sta_info_clear_tim_bit(struct sta_info *sta)
|
|
{
|
|
unsigned long flags;
|
|
|
|
BUG_ON(!sta->sdata->bss);
|
|
|
|
spin_lock_irqsave(&sta->local->sta_lock, flags);
|
|
__sta_info_clear_tim_bit(sta->sdata->bss, sta);
|
|
spin_unlock_irqrestore(&sta->local->sta_lock, flags);
|
|
}
|
|
|
|
static void __sta_info_unlink(struct sta_info **sta)
|
|
{
|
|
struct ieee80211_local *local = (*sta)->local;
|
|
struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
|
|
/*
|
|
* pull caller's reference if we're already gone.
|
|
*/
|
|
if (sta_info_hash_del(local, *sta)) {
|
|
*sta = NULL;
|
|
return;
|
|
}
|
|
|
|
if ((*sta)->key) {
|
|
ieee80211_key_free((*sta)->key);
|
|
WARN_ON((*sta)->key);
|
|
}
|
|
|
|
list_del(&(*sta)->list);
|
|
|
|
if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
|
|
BUG_ON(!sdata->bss);
|
|
|
|
atomic_dec(&sdata->bss->num_sta_ps);
|
|
__sta_info_clear_tim_bit(sdata->bss, *sta);
|
|
}
|
|
|
|
local->num_sta--;
|
|
|
|
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);
|
|
|
|
local->ops->sta_notify(local_to_hw(local), &sdata->vif,
|
|
STA_NOTIFY_REMOVE, &(*sta)->sta);
|
|
}
|
|
|
|
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 inline int sta_info_buffer_expired(struct ieee80211_local *local,
|
|
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 * local->hw.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(local, 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();
|
|
|
|
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
|
|
|
|
static void __ieee80211_run_pending_flush(struct ieee80211_local *local)
|
|
{
|
|
struct sta_info *sta;
|
|
unsigned long flags;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
while (!list_empty(&local->sta_flush_list)) {
|
|
sta = list_first_entry(&local->sta_flush_list,
|
|
struct sta_info, list);
|
|
list_del(&sta->list);
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
sta_info_destroy(sta);
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
}
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
}
|
|
|
|
static void ieee80211_sta_flush_work(struct work_struct *work)
|
|
{
|
|
struct ieee80211_local *local =
|
|
container_of(work, struct ieee80211_local, sta_flush_work);
|
|
|
|
rtnl_lock();
|
|
__ieee80211_run_pending_flush(local);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
void sta_info_init(struct ieee80211_local *local)
|
|
{
|
|
spin_lock_init(&local->sta_lock);
|
|
INIT_LIST_HEAD(&local->sta_list);
|
|
INIT_LIST_HEAD(&local->sta_flush_list);
|
|
INIT_WORK(&local->sta_flush_work, ieee80211_sta_flush_work);
|
|
|
|
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);
|
|
cancel_work_sync(&local->sta_flush_work);
|
|
#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
|
|
|
|
rtnl_lock();
|
|
sta_info_flush(local, NULL);
|
|
__ieee80211_run_pending_flush(local);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
/**
|
|
* 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();
|
|
ASSERT_RTNL();
|
|
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* sta_info_flush_delayed - flush matching STA entries from the STA table
|
|
*
|
|
* This function unlinks all stations for a given interface and queues
|
|
* them for freeing. Note that the workqueue function scheduled here has
|
|
* to run before any new keys can be added to the system to avoid set_key()
|
|
* callback ordering issues.
|
|
*
|
|
* @sdata: the interface
|
|
*/
|
|
void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sta_info *sta, *tmp;
|
|
unsigned long flags;
|
|
bool work = false;
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
|
|
if (sdata == sta->sdata) {
|
|
__sta_info_unlink(&sta);
|
|
if (sta) {
|
|
list_add_tail(&sta->list,
|
|
&local->sta_flush_list);
|
|
work = true;
|
|
}
|
|
}
|
|
}
|
|
if (work)
|
|
schedule_work(&local->sta_flush_work);
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
}
|
|
|
|
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(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(ieee80211_find_sta);
|