mirror of https://gitee.com/openkylin/linux.git
1128 lines
29 KiB
C
1128 lines
29 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
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* owns that structure. It must then insert it into the hash table using
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* either sta_info_insert() or sta_info_insert_rcu(); only in the latter
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* case (which acquires an rcu read section but must not be called from
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* within one) will the pointer still be valid after the call. Note that
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* the caller may not do much with the STA info before inserting it, in
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* particular, it may not start any mesh peer link management or add
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* 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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* Station 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 association response from the AP. For IBSS this occurs when
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* get to know about a peer on the same IBSS. For WDS we add the sta for
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* the peer immediately upon device open. When using AP mode we add stations
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* for each respective station upon request from userspace through nl80211.
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*
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* In order to remove a STA info structure, various sta_info_destroy_*()
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* calls are available.
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*
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* There is no concept of ownership on a STA entry, each structure is
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* owned by the global hash table/list until it is removed. All users of
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* the structure need to be RCU protected so that the structure won't be
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* 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 = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
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lockdep_is_held(&local->sta_lock));
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if (!s)
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return -ENOENT;
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if (s == sta) {
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RCU_INIT_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 (rcu_access_pointer(s->hnext) &&
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rcu_access_pointer(s->hnext) != sta)
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s = rcu_dereference_protected(s->hnext,
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lockdep_is_held(&local->sta_lock));
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if (rcu_access_pointer(s->hnext)) {
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RCU_INIT_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_sub_if_data *sdata,
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const u8 *addr)
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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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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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while (sta) {
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if (sta->sdata == sdata && !sta->dummy &&
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memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
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break;
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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}
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return sta;
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}
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/* get a station info entry even if it is a dummy station*/
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struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata,
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const u8 *addr)
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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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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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while (sta) {
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if (sta->sdata == sdata &&
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memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
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break;
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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}
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return sta;
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}
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/*
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* Get sta info either from the specified interface
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* or from one of its vlans
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*/
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struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
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const u8 *addr)
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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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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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while (sta) {
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if ((sta->sdata == sdata ||
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(sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
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!sta->dummy &&
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memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
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break;
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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}
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return sta;
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}
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/*
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* Get sta info either from the specified interface
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* or from one of its vlans (including dummy stations)
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*/
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struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata,
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const u8 *addr)
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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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sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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while (sta) {
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if ((sta->sdata == sdata ||
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(sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
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memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
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break;
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sta = rcu_dereference_check(sta->hnext,
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lockdep_is_held(&local->sta_lock) ||
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lockdep_is_held(&local->sta_mtx));
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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_sub_if_data *sdata,
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int idx)
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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 = 0;
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list_for_each_entry_rcu(sta, &local->sta_list, list) {
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if (sdata != sta->sdata)
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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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if (sta->rate_ctrl) {
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rate_control_free_sta(sta);
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rate_control_put(sta->rate_ctrl);
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}
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", 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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/* 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_INIT_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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clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
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ieee80211_sta_ps_deliver_poll_response(sta);
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} else
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clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
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}
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static int sta_prepare_rate_control(struct ieee80211_local *local,
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struct sta_info *sta, gfp_t gfp)
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{
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if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
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return 0;
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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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return -ENOMEM;
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}
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return 0;
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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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struct timespec uptime;
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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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INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
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mutex_init(&sta->ampdu_mlme.mtx);
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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->last_rx = jiffies;
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do_posix_clock_monotonic_gettime(&uptime);
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sta->last_connected = uptime.tv_sec;
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ewma_init(&sta->avg_signal, 1024, 8);
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if (sta_prepare_rate_control(local, sta, gfp)) {
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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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/*
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* timer_to_tid must be initialized with identity mapping
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* to enable session_timer's data differentiation. See
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* sta_rx_agg_session_timer_expired for usage.
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*/
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sta->timer_to_tid[i] = i;
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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(USHRT_MAX);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", 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 = NL80211_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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static int sta_info_finish_insert(struct sta_info *sta,
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bool async, bool dummy_reinsert)
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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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struct station_info sinfo;
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unsigned long flags;
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int err = 0;
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lockdep_assert_held(&local->sta_mtx);
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if (!sta->dummy || dummy_reinsert) {
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/* notify driver */
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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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err = drv_sta_add(local, sdata, &sta->sta);
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if (err) {
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if (!async)
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return err;
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printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to "
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"driver (%d) - keeping it anyway.\n",
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sdata->name, sta->sta.addr, err);
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} else {
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sta->uploaded = true;
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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if (async)
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wiphy_debug(local->hw.wiphy,
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"Finished adding IBSS STA %pM\n",
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sta->sta.addr);
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#endif
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}
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sdata = sta->sdata;
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}
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if (!dummy_reinsert) {
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if (!async) {
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local->num_sta++;
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local->sta_generation++;
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smp_mb();
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/* make the station visible */
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spin_lock_irqsave(&local->sta_lock, flags);
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sta_info_hash_add(local, sta);
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spin_unlock_irqrestore(&local->sta_lock, flags);
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}
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list_add(&sta->list, &local->sta_list);
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} else {
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sta->dummy = false;
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}
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if (!sta->dummy) {
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ieee80211_sta_debugfs_add(sta);
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rate_control_add_sta_debugfs(sta);
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memset(&sinfo, 0, sizeof(sinfo));
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sinfo.filled = 0;
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sinfo.generation = local->sta_generation;
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cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
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}
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return 0;
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}
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static void sta_info_finish_pending(struct ieee80211_local *local)
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{
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struct sta_info *sta;
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unsigned long flags;
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spin_lock_irqsave(&local->sta_lock, flags);
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while (!list_empty(&local->sta_pending_list)) {
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sta = list_first_entry(&local->sta_pending_list,
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struct sta_info, list);
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list_del(&sta->list);
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spin_unlock_irqrestore(&local->sta_lock, flags);
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sta_info_finish_insert(sta, true, false);
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spin_lock_irqsave(&local->sta_lock, flags);
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}
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spin_unlock_irqrestore(&local->sta_lock, flags);
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}
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static void sta_info_finish_work(struct work_struct *work)
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{
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struct ieee80211_local *local =
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container_of(work, struct ieee80211_local, sta_finish_work);
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mutex_lock(&local->sta_mtx);
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sta_info_finish_pending(local);
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mutex_unlock(&local->sta_mtx);
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}
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static int sta_info_insert_check(struct sta_info *sta)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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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(!ieee80211_sdata_running(sdata)))
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return -ENETDOWN;
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if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
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is_multicast_ether_addr(sta->sta.addr)))
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return -EINVAL;
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return 0;
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}
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static int sta_info_insert_ibss(struct sta_info *sta) __acquires(RCU)
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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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spin_lock_irqsave(&local->sta_lock, flags);
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/* check if STA exists already */
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if (sta_info_get_bss_rx(sdata, sta->sta.addr)) {
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spin_unlock_irqrestore(&local->sta_lock, flags);
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rcu_read_lock();
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return -EEXIST;
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}
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local->num_sta++;
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local->sta_generation++;
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smp_mb();
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sta_info_hash_add(local, sta);
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list_add_tail(&sta->list, &local->sta_pending_list);
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rcu_read_lock();
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spin_unlock_irqrestore(&local->sta_lock, flags);
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#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
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wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
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sta->sta.addr);
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#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
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ieee80211_queue_work(&local->hw, &local->sta_finish_work);
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return 0;
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}
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/*
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* should be called with sta_mtx locked
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* this function replaces the mutex lock
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* with a RCU lock
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*/
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static int sta_info_insert_non_ibss(struct sta_info *sta) __acquires(RCU)
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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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struct sta_info *exist_sta;
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bool dummy_reinsert = false;
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int err = 0;
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lockdep_assert_held(&local->sta_mtx);
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/*
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* On first glance, this will look racy, because the code
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|
* in this function, which inserts a station with sleeping,
|
|
* unlocks the sta_lock between checking existence in the
|
|
* hash table and inserting into it.
|
|
*
|
|
* However, it is not racy against itself because it keeps
|
|
* the mutex locked.
|
|
*/
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
/*
|
|
* check if STA exists already.
|
|
* only accept a scenario of a second call to sta_info_insert_non_ibss
|
|
* with a dummy station entry that was inserted earlier
|
|
* in that case - assume that the dummy station flag should
|
|
* be removed.
|
|
*/
|
|
exist_sta = sta_info_get_bss_rx(sdata, sta->sta.addr);
|
|
if (exist_sta) {
|
|
if (exist_sta == sta && sta->dummy) {
|
|
dummy_reinsert = true;
|
|
} else {
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
mutex_unlock(&local->sta_mtx);
|
|
rcu_read_lock();
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
|
|
err = sta_info_finish_insert(sta, false, dummy_reinsert);
|
|
if (err) {
|
|
mutex_unlock(&local->sta_mtx);
|
|
rcu_read_lock();
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
wiphy_debug(local->hw.wiphy, "Inserted %sSTA %pM\n",
|
|
sta->dummy ? "dummy " : "", sta->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
|
|
/* move reference to rcu-protected */
|
|
rcu_read_lock();
|
|
mutex_unlock(&local->sta_mtx);
|
|
|
|
if (ieee80211_vif_is_mesh(&sdata->vif))
|
|
mesh_accept_plinks_update(sdata);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
struct ieee80211_sub_if_data *sdata = sta->sdata;
|
|
int err = 0;
|
|
|
|
err = sta_info_insert_check(sta);
|
|
if (err) {
|
|
rcu_read_lock();
|
|
goto out_free;
|
|
}
|
|
|
|
/*
|
|
* In ad-hoc mode, we sometimes need to insert stations
|
|
* from tasklet context from the RX path. To avoid races,
|
|
* always do so in that case -- see the comment below.
|
|
*/
|
|
if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
|
|
err = sta_info_insert_ibss(sta);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* It might seem that the function called below is in race against
|
|
* the function call above that atomically inserts the station... That,
|
|
* however, is not true because the above code can only
|
|
* be invoked for IBSS interfaces, and the below code will
|
|
* not be -- and the two do not race against each other as
|
|
* the hash table also keys off the interface.
|
|
*/
|
|
|
|
might_sleep();
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
|
|
err = sta_info_insert_non_ibss(sta);
|
|
if (err)
|
|
goto out_free;
|
|
|
|
return 0;
|
|
out_free:
|
|
BUG_ON(!err);
|
|
__sta_info_free(local, sta);
|
|
return err;
|
|
}
|
|
|
|
int sta_info_insert(struct sta_info *sta)
|
|
{
|
|
int err = sta_info_insert_rcu(sta);
|
|
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
/* Caller must hold sta->local->sta_mtx */
|
|
int sta_info_reinsert(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local = sta->local;
|
|
int err = 0;
|
|
|
|
err = sta_info_insert_check(sta);
|
|
if (err) {
|
|
mutex_unlock(&local->sta_mtx);
|
|
return err;
|
|
}
|
|
|
|
might_sleep();
|
|
|
|
err = sta_info_insert_non_ibss(sta);
|
|
rcu_read_unlock();
|
|
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;
|
|
drv_set_tim(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;
|
|
drv_set_tim(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 bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
|
|
{
|
|
struct ieee80211_tx_info *info;
|
|
int timeout;
|
|
|
|
if (!skb)
|
|
return false;
|
|
|
|
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 bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
|
|
struct sta_info *sta)
|
|
{
|
|
unsigned long flags;
|
|
struct sk_buff *skb;
|
|
|
|
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;
|
|
|
|
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) &&
|
|
!test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF))
|
|
sta_info_clear_tim_bit(sta);
|
|
}
|
|
|
|
return !skb_queue_empty(&sta->ps_tx_buf);
|
|
}
|
|
|
|
static int __must_check __sta_info_destroy(struct sta_info *sta)
|
|
{
|
|
struct ieee80211_local *local;
|
|
struct ieee80211_sub_if_data *sdata;
|
|
struct sk_buff *skb;
|
|
unsigned long flags;
|
|
int ret, i;
|
|
|
|
might_sleep();
|
|
|
|
if (!sta)
|
|
return -ENOENT;
|
|
|
|
local = sta->local;
|
|
sdata = sta->sdata;
|
|
|
|
/*
|
|
* Before removing the station from the driver and
|
|
* rate control, it might still start new aggregation
|
|
* sessions -- block that to make sure the tear-down
|
|
* will be sufficient.
|
|
*/
|
|
set_sta_flags(sta, WLAN_STA_BLOCK_BA);
|
|
ieee80211_sta_tear_down_BA_sessions(sta, true);
|
|
|
|
spin_lock_irqsave(&local->sta_lock, flags);
|
|
ret = sta_info_hash_del(local, sta);
|
|
/* this might still be the pending list ... which is fine */
|
|
if (!ret)
|
|
list_del(&sta->list);
|
|
spin_unlock_irqrestore(&local->sta_lock, flags);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_lock(&local->key_mtx);
|
|
for (i = 0; i < NUM_DEFAULT_KEYS; i++)
|
|
__ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
|
|
if (sta->ptk)
|
|
__ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
|
|
mutex_unlock(&local->key_mtx);
|
|
|
|
sta->dead = true;
|
|
|
|
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(sta);
|
|
}
|
|
|
|
local->num_sta--;
|
|
local->sta_generation++;
|
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
|
|
|
|
if (sta->uploaded) {
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
|
|
sdata = container_of(sdata->bss,
|
|
struct ieee80211_sub_if_data,
|
|
u.ap);
|
|
drv_sta_remove(local, sdata, &sta->sta);
|
|
sdata = sta->sdata;
|
|
}
|
|
|
|
/*
|
|
* At this point, after we wait for an RCU grace period,
|
|
* neither mac80211 nor the driver can reference this
|
|
* sta struct any more except by still existing timers
|
|
* associated with this station that we clean up below.
|
|
*/
|
|
synchronize_rcu();
|
|
|
|
#ifdef CONFIG_MAC80211_MESH
|
|
if (ieee80211_vif_is_mesh(&sdata->vif))
|
|
mesh_accept_plinks_update(sdata);
|
|
#endif
|
|
|
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
|
|
wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
|
|
#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
|
|
cancel_work_sync(&sta->drv_unblock_wk);
|
|
|
|
cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
|
|
|
|
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);
|
|
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);
|
|
|
|
__sta_info_free(local, sta);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
int ret;
|
|
|
|
mutex_lock(&sdata->local->sta_mtx);
|
|
sta = sta_info_get_rx(sdata, addr);
|
|
ret = __sta_info_destroy(sta);
|
|
mutex_unlock(&sdata->local->sta_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
|
|
const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
int ret;
|
|
|
|
mutex_lock(&sdata->local->sta_mtx);
|
|
sta = sta_info_get_bss_rx(sdata, addr);
|
|
ret = __sta_info_destroy(sta);
|
|
mutex_unlock(&sdata->local->sta_mtx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void sta_info_cleanup(unsigned long data)
|
|
{
|
|
struct ieee80211_local *local = (struct ieee80211_local *) data;
|
|
struct sta_info *sta;
|
|
bool timer_needed = false;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sta, &local->sta_list, list)
|
|
if (sta_info_cleanup_expire_buffered(local, sta))
|
|
timer_needed = true;
|
|
rcu_read_unlock();
|
|
|
|
if (local->quiescing)
|
|
return;
|
|
|
|
if (!timer_needed)
|
|
return;
|
|
|
|
mod_timer(&local->sta_cleanup,
|
|
round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
|
|
}
|
|
|
|
void sta_info_init(struct ieee80211_local *local)
|
|
{
|
|
spin_lock_init(&local->sta_lock);
|
|
mutex_init(&local->sta_mtx);
|
|
INIT_LIST_HEAD(&local->sta_list);
|
|
INIT_LIST_HEAD(&local->sta_pending_list);
|
|
INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
|
|
|
|
setup_timer(&local->sta_cleanup, sta_info_cleanup,
|
|
(unsigned long)local);
|
|
}
|
|
|
|
void sta_info_stop(struct ieee80211_local *local)
|
|
{
|
|
del_timer(&local->sta_cleanup);
|
|
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;
|
|
int ret = 0;
|
|
|
|
might_sleep();
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
|
|
sta_info_finish_pending(local);
|
|
|
|
list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
|
|
if (!sdata || sdata == sta->sdata)
|
|
WARN_ON(__sta_info_destroy(sta));
|
|
}
|
|
mutex_unlock(&local->sta_mtx);
|
|
|
|
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;
|
|
|
|
mutex_lock(&local->sta_mtx);
|
|
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->name, sta->sta.addr);
|
|
#endif
|
|
WARN_ON(__sta_info_destroy(sta));
|
|
}
|
|
mutex_unlock(&local->sta_mtx);
|
|
}
|
|
|
|
struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
|
|
const u8 *addr,
|
|
const u8 *localaddr)
|
|
{
|
|
struct sta_info *sta, *nxt;
|
|
|
|
/*
|
|
* Just return a random station if localaddr is NULL
|
|
* ... first in list.
|
|
*/
|
|
for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
|
|
if (localaddr &&
|
|
compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
|
|
continue;
|
|
if (!sta->uploaded)
|
|
return NULL;
|
|
return &sta->sta;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
|
|
|
|
struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
|
|
const u8 *addr)
|
|
{
|
|
struct sta_info *sta;
|
|
|
|
if (!vif)
|
|
return NULL;
|
|
|
|
sta = sta_info_get_bss(vif_to_sdata(vif), addr);
|
|
if (!sta)
|
|
return NULL;
|
|
|
|
if (!sta->uploaded)
|
|
return NULL;
|
|
|
|
return &sta->sta;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_find_sta);
|
|
|
|
static void clear_sta_ps_flags(void *_sta)
|
|
{
|
|
struct sta_info *sta = _sta;
|
|
|
|
clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_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;
|
|
|
|
clear_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
|
|
if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
|
|
drv_sta_notify(local, sdata, 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_fn(local, &sta->ps_tx_buf,
|
|
clear_sta_ps_flags, sta);
|
|
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->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->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);
|
|
|
|
trace_api_sta_block_awake(sta->local, pubsta, block);
|
|
|
|
if (block)
|
|
set_sta_flags(sta, WLAN_STA_PS_DRIVER);
|
|
else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))
|
|
ieee80211_queue_work(hw, &sta->drv_unblock_wk);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sta_block_awake);
|
|
|
|
void ieee80211_sta_set_tim(struct ieee80211_sta *pubsta)
|
|
{
|
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
|
|
|
|
set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
|
|
sta_info_set_tim_bit(sta);
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_sta_set_tim);
|