| /* |
| * 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 "driver-ops.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 insert it into the hash table using |
| * either sta_info_insert() or sta_info_insert_rcu(); only in the latter |
| * case (which acquires an rcu read section but must not be called from |
| * within one) will the pointer still be valid after the call. 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()! |
| * |
| * Station entries are added by mac80211 when you establish a link with a |
| * peer. This means different things for the different type of interfaces |
| * we support. For a regular station this mean we add the AP sta when we |
| * receive an association response from the AP. For IBSS this occurs when |
| * get to know about a peer on the same IBSS. For WDS we add the sta for |
| * the peer immediately upon device open. When using AP mode we add stations |
| * for each respective station upon request from userspace through nl80211. |
| * |
| * In order to remove a STA info structure, various sta_info_destroy_*() |
| * calls are available. |
| * |
| * 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 = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], |
| lockdep_is_held(&local->sta_lock)); |
| if (!s) |
| return -ENOENT; |
| if (s == sta) { |
| RCU_INIT_POINTER(local->sta_hash[STA_HASH(sta->sta.addr)], |
| s->hnext); |
| return 0; |
| } |
| |
| while (rcu_access_pointer(s->hnext) && |
| rcu_access_pointer(s->hnext) != sta) |
| s = rcu_dereference_protected(s->hnext, |
| lockdep_is_held(&local->sta_lock)); |
| if (rcu_access_pointer(s->hnext)) { |
| RCU_INIT_POINTER(s->hnext, sta->hnext); |
| return 0; |
| } |
| |
| return -ENOENT; |
| } |
| |
| /* protected by RCU */ |
| struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
| const u8 *addr) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| while (sta) { |
| if (sta->sdata == sdata && !sta->dummy && |
| memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
| break; |
| sta = rcu_dereference_check(sta->hnext, |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| } |
| return sta; |
| } |
| |
| /* get a station info entry even if it is a dummy station*/ |
| struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata, |
| const u8 *addr) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| while (sta) { |
| if (sta->sdata == sdata && |
| memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
| break; |
| sta = rcu_dereference_check(sta->hnext, |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| } |
| return sta; |
| } |
| |
| /* |
| * Get sta info either from the specified interface |
| * or from one of its vlans |
| */ |
| struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, |
| const u8 *addr) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| while (sta) { |
| if ((sta->sdata == sdata || |
| (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
| !sta->dummy && |
| memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
| break; |
| sta = rcu_dereference_check(sta->hnext, |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| } |
| return sta; |
| } |
| |
| /* |
| * Get sta info either from the specified interface |
| * or from one of its vlans (including dummy stations) |
| */ |
| struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata, |
| const u8 *addr) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| while (sta) { |
| if ((sta->sdata == sdata || |
| (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
| memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
| break; |
| sta = rcu_dereference_check(sta->hnext, |
| lockdep_is_held(&local->sta_lock) || |
| lockdep_is_held(&local->sta_mtx)); |
| } |
| return sta; |
| } |
| |
| struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
| int idx) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| int i = 0; |
| |
| list_for_each_entry_rcu(sta, &local->sta_list, list) { |
| if (sdata != sta->sdata) |
| 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) |
| { |
| if (sta->rate_ctrl) { |
| rate_control_free_sta(sta); |
| rate_control_put(sta->rate_ctrl); |
| } |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); |
| #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| |
| kfree(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_INIT_POINTER(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
| } |
| |
| static void sta_unblock(struct work_struct *wk) |
| { |
| struct sta_info *sta; |
| |
| sta = container_of(wk, struct sta_info, drv_unblock_wk); |
| |
| if (sta->dead) |
| return; |
| |
| if (!test_sta_flags(sta, WLAN_STA_PS_STA)) |
| ieee80211_sta_ps_deliver_wakeup(sta); |
| else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) { |
| clear_sta_flags(sta, WLAN_STA_PS_DRIVER); |
| ieee80211_sta_ps_deliver_poll_response(sta); |
| } else |
| clear_sta_flags(sta, WLAN_STA_PS_DRIVER); |
| } |
| |
| static int sta_prepare_rate_control(struct ieee80211_local *local, |
| struct sta_info *sta, gfp_t gfp) |
| { |
| if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) |
| return 0; |
| |
| 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); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| struct timespec uptime; |
| 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); |
| INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
| INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
| mutex_init(&sta->ampdu_mlme.mtx); |
| |
| memcpy(sta->sta.addr, addr, ETH_ALEN); |
| sta->local = local; |
| sta->sdata = sdata; |
| sta->last_rx = jiffies; |
| |
| do_posix_clock_monotonic_gettime(&uptime); |
| sta->last_connected = uptime.tv_sec; |
| ewma_init(&sta->avg_signal, 1024, 8); |
| |
| if (sta_prepare_rate_control(local, sta, gfp)) { |
| 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. See |
| * sta_rx_agg_session_timer_expired for usage. |
| */ |
| sta->timer_to_tid[i] = i; |
| } |
| skb_queue_head_init(&sta->ps_tx_buf); |
| skb_queue_head_init(&sta->tx_filtered); |
| |
| for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
| sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); |
| #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| |
| #ifdef CONFIG_MAC80211_MESH |
| sta->plink_state = NL80211_PLINK_LISTEN; |
| init_timer(&sta->plink_timer); |
| #endif |
| |
| return sta; |
| } |
| |
| static int sta_info_finish_insert(struct sta_info *sta, |
| bool async, bool dummy_reinsert) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct station_info sinfo; |
| unsigned long flags; |
| int err = 0; |
| |
| lockdep_assert_held(&local->sta_mtx); |
| |
| if (!sta->dummy || dummy_reinsert) { |
| /* notify driver */ |
| if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| sdata = container_of(sdata->bss, |
| struct ieee80211_sub_if_data, |
| u.ap); |
| err = drv_sta_add(local, sdata, &sta->sta); |
| if (err) { |
| if (!async) |
| return err; |
| printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to " |
| "driver (%d) - keeping it anyway.\n", |
| sdata->name, sta->sta.addr, err); |
| } else { |
| sta->uploaded = true; |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| if (async) |
| wiphy_debug(local->hw.wiphy, |
| "Finished adding IBSS STA %pM\n", |
| sta->sta.addr); |
| #endif |
| } |
| |
| sdata = sta->sdata; |
| } |
| |
| if (!dummy_reinsert) { |
| if (!async) { |
| local->num_sta++; |
| local->sta_generation++; |
| smp_mb(); |
| |
| /* make the station visible */ |
| spin_lock_irqsave(&local->sta_lock, flags); |
| sta_info_hash_add(local, sta); |
| spin_unlock_irqrestore(&local->sta_lock, flags); |
| } |
| |
| list_add(&sta->list, &local->sta_list); |
| } else { |
| sta->dummy = false; |
| } |
| |
| if (!sta->dummy) { |
| ieee80211_sta_debugfs_add(sta); |
| rate_control_add_sta_debugfs(sta); |
| |
| memset(&sinfo, 0, sizeof(sinfo)); |
| sinfo.filled = 0; |
| sinfo.generation = local->sta_generation; |
| cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); |
| } |
| |
| return 0; |
| } |
| |
| static void sta_info_finish_pending(struct ieee80211_local *local) |
| { |
| struct sta_info *sta; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&local->sta_lock, flags); |
| while (!list_empty(&local->sta_pending_list)) { |
| sta = list_first_entry(&local->sta_pending_list, |
| struct sta_info, list); |
| list_del(&sta->list); |
| spin_unlock_irqrestore(&local->sta_lock, flags); |
| |
| sta_info_finish_insert(sta, true, false); |
| |
| spin_lock_irqsave(&local->sta_lock, flags); |
| } |
| spin_unlock_irqrestore(&local->sta_lock, flags); |
| } |
| |
| static void sta_info_finish_work(struct work_struct *work) |
| { |
| struct ieee80211_local *local = |
| container_of(work, struct ieee80211_local, sta_finish_work); |
| |
| mutex_lock(&local->sta_mtx); |
| sta_info_finish_pending(local); |
| mutex_unlock(&local->sta_mtx); |
| } |
| |
| static int sta_info_insert_check(struct sta_info *sta) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| |
| /* |
| * 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(!ieee80211_sdata_running(sdata))) |
| return -ENETDOWN; |
| |
| if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
| is_multicast_ether_addr(sta->sta.addr))) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int sta_info_insert_ibss(struct sta_info *sta) __acquires(RCU) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&local->sta_lock, flags); |
| /* check if STA exists already */ |
| if (sta_info_get_bss_rx(sdata, sta->sta.addr)) { |
| spin_unlock_irqrestore(&local->sta_lock, flags); |
| rcu_read_lock(); |
| return -EEXIST; |
| } |
| |
| local->num_sta++; |
| local->sta_generation++; |
| smp_mb(); |
| sta_info_hash_add(local, sta); |
| |
| list_add_tail(&sta->list, &local->sta_pending_list); |
| |
| rcu_read_lock(); |
| spin_unlock_irqrestore(&local->sta_lock, flags); |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n", |
| sta->sta.addr); |
| #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
| |
| ieee80211_queue_work(&local->hw, &local->sta_finish_work); |
| |
| return 0; |
| } |
| |
| /* |
| * should be called with sta_mtx locked |
| * this function replaces the mutex lock |
| * with a RCU lock |
| */ |
| static int sta_info_insert_non_ibss(struct sta_info *sta) __acquires(RCU) |
| { |
| struct ieee80211_local *local = sta->local; |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| unsigned long flags; |
| struct sta_info *exist_sta; |
| bool dummy_reinsert = false; |
| int err = 0; |
| |
| lockdep_assert_held(&local->sta_mtx); |
| |
| /* |
| * On first glance, this will look racy, because the code |
| * 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 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 bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, |
| struct sta_info *sta) |
| { |
| unsigned long flags; |
| struct sk_buff *skb; |
| |
| if (skb_queue_empty(&sta->ps_tx_buf)) |
| return false; |
| |
| 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 true; |
| } |
| |
| 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(sdata->bss, 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); |