246 строки
6.6 KiB
C
246 строки
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* OCB mode implementation
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*
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* Copyright: (c) 2014 Czech Technical University in Prague
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* (c) 2014 Volkswagen Group Research
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* Author: Rostislav Lisovy <rostislav.lisovy@fel.cvut.cz>
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* Funded by: Volkswagen Group Research
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*/
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#include <linux/delay.h>
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#include <linux/if_ether.h>
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#include <linux/skbuff.h>
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#include <linux/if_arp.h>
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#include <linux/etherdevice.h>
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#include <linux/rtnetlink.h>
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#include <net/mac80211.h>
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#include <asm/unaligned.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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#define IEEE80211_OCB_HOUSEKEEPING_INTERVAL (60 * HZ)
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#define IEEE80211_OCB_PEER_INACTIVITY_LIMIT (240 * HZ)
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#define IEEE80211_OCB_MAX_STA_ENTRIES 128
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/**
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* enum ocb_deferred_task_flags - mac80211 OCB deferred tasks
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* @OCB_WORK_HOUSEKEEPING: run the periodic OCB housekeeping tasks
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*
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* These flags are used in @wrkq_flags field of &struct ieee80211_if_ocb
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*/
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enum ocb_deferred_task_flags {
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OCB_WORK_HOUSEKEEPING,
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};
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void ieee80211_ocb_rx_no_sta(struct ieee80211_sub_if_data *sdata,
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const u8 *bssid, const u8 *addr,
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u32 supp_rates)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_chanctx_conf *chanctx_conf;
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struct ieee80211_supported_band *sband;
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enum nl80211_bss_scan_width scan_width;
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struct sta_info *sta;
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int band;
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/* XXX: Consider removing the least recently used entry and
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* allow new one to be added.
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*/
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if (local->num_sta >= IEEE80211_OCB_MAX_STA_ENTRIES) {
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net_info_ratelimited("%s: No room for a new OCB STA entry %pM\n",
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sdata->name, addr);
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return;
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}
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ocb_dbg(sdata, "Adding new OCB station %pM\n", addr);
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rcu_read_lock();
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chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
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if (WARN_ON_ONCE(!chanctx_conf)) {
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rcu_read_unlock();
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return;
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}
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band = chanctx_conf->def.chan->band;
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scan_width = cfg80211_chandef_to_scan_width(&chanctx_conf->def);
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rcu_read_unlock();
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sta = sta_info_alloc(sdata, addr, GFP_ATOMIC);
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if (!sta)
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return;
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/* Add only mandatory rates for now */
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sband = local->hw.wiphy->bands[band];
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sta->sta.supp_rates[band] =
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ieee80211_mandatory_rates(sband, scan_width);
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spin_lock(&ifocb->incomplete_lock);
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list_add(&sta->list, &ifocb->incomplete_stations);
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spin_unlock(&ifocb->incomplete_lock);
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ieee80211_queue_work(&local->hw, &sdata->work);
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}
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static struct sta_info *ieee80211_ocb_finish_sta(struct sta_info *sta)
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__acquires(RCU)
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{
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struct ieee80211_sub_if_data *sdata = sta->sdata;
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u8 addr[ETH_ALEN];
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memcpy(addr, sta->sta.addr, ETH_ALEN);
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ocb_dbg(sdata, "Adding new IBSS station %pM (dev=%s)\n",
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addr, sdata->name);
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sta_info_move_state(sta, IEEE80211_STA_AUTH);
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sta_info_move_state(sta, IEEE80211_STA_ASSOC);
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sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
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rate_control_rate_init(sta);
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/* If it fails, maybe we raced another insertion? */
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if (sta_info_insert_rcu(sta))
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return sta_info_get(sdata, addr);
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return sta;
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}
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static void ieee80211_ocb_housekeeping(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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ocb_dbg(sdata, "Running ocb housekeeping\n");
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ieee80211_sta_expire(sdata, IEEE80211_OCB_PEER_INACTIVITY_LIMIT);
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mod_timer(&ifocb->housekeeping_timer,
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round_jiffies(jiffies + IEEE80211_OCB_HOUSEKEEPING_INTERVAL));
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}
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void ieee80211_ocb_work(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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struct sta_info *sta;
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if (ifocb->joined != true)
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return;
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sdata_lock(sdata);
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spin_lock_bh(&ifocb->incomplete_lock);
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while (!list_empty(&ifocb->incomplete_stations)) {
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sta = list_first_entry(&ifocb->incomplete_stations,
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struct sta_info, list);
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list_del(&sta->list);
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spin_unlock_bh(&ifocb->incomplete_lock);
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ieee80211_ocb_finish_sta(sta);
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rcu_read_unlock();
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spin_lock_bh(&ifocb->incomplete_lock);
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}
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spin_unlock_bh(&ifocb->incomplete_lock);
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if (test_and_clear_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags))
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ieee80211_ocb_housekeeping(sdata);
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sdata_unlock(sdata);
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}
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static void ieee80211_ocb_housekeeping_timer(struct timer_list *t)
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{
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struct ieee80211_sub_if_data *sdata =
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from_timer(sdata, t, u.ocb.housekeeping_timer);
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
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ieee80211_queue_work(&local->hw, &sdata->work);
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}
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void ieee80211_ocb_setup_sdata(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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timer_setup(&ifocb->housekeeping_timer,
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ieee80211_ocb_housekeeping_timer, 0);
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INIT_LIST_HEAD(&ifocb->incomplete_stations);
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spin_lock_init(&ifocb->incomplete_lock);
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}
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int ieee80211_ocb_join(struct ieee80211_sub_if_data *sdata,
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struct ocb_setup *setup)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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u32 changed = BSS_CHANGED_OCB | BSS_CHANGED_BSSID;
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int err;
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if (ifocb->joined == true)
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return -EINVAL;
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sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
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sdata->smps_mode = IEEE80211_SMPS_OFF;
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sdata->needed_rx_chains = sdata->local->rx_chains;
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mutex_lock(&sdata->local->mtx);
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err = ieee80211_vif_use_channel(sdata, &setup->chandef,
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IEEE80211_CHANCTX_SHARED);
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mutex_unlock(&sdata->local->mtx);
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if (err)
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return err;
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ieee80211_bss_info_change_notify(sdata, changed);
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ifocb->joined = true;
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set_bit(OCB_WORK_HOUSEKEEPING, &ifocb->wrkq_flags);
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ieee80211_queue_work(&local->hw, &sdata->work);
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netif_carrier_on(sdata->dev);
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return 0;
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}
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int ieee80211_ocb_leave(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_if_ocb *ifocb = &sdata->u.ocb;
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struct ieee80211_local *local = sdata->local;
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struct sta_info *sta;
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ifocb->joined = false;
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sta_info_flush(sdata);
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spin_lock_bh(&ifocb->incomplete_lock);
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while (!list_empty(&ifocb->incomplete_stations)) {
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sta = list_first_entry(&ifocb->incomplete_stations,
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struct sta_info, list);
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list_del(&sta->list);
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spin_unlock_bh(&ifocb->incomplete_lock);
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sta_info_free(local, sta);
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spin_lock_bh(&ifocb->incomplete_lock);
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}
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spin_unlock_bh(&ifocb->incomplete_lock);
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netif_carrier_off(sdata->dev);
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clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
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ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_OCB);
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mutex_lock(&sdata->local->mtx);
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ieee80211_vif_release_channel(sdata);
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mutex_unlock(&sdata->local->mtx);
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skb_queue_purge(&sdata->skb_queue);
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del_timer_sync(&sdata->u.ocb.housekeeping_timer);
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/* If the timer fired while we waited for it, it will have
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* requeued the work. Now the work will be running again
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* but will not rearm the timer again because it checks
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* whether we are connected to the network or not -- at this
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* point we shouldn't be anymore.
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*/
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return 0;
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}
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