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   1 /*
   2  * HT handling
   3  *
   4  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9  * Copyright 2007-2008, Intel Corporation
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/ieee80211.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "driver-ops.h"
  20
  21 void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid,
  22                                     u16 initiator, u16 reason)
  23 {
  24         struct ieee80211_local *local = sta->local;
  25         int i;
  26
  27         /* check if TID is in operational state */
  28         spin_lock_bh(&sta->lock);
  29         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) {
  30                 spin_unlock_bh(&sta->lock);
  31                 return;
  32         }
  33
  34         sta->ampdu_mlme.tid_state_rx[tid] =
  35                 HT_AGG_STATE_REQ_STOP_BA_MSK |
  36                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
  37         spin_unlock_bh(&sta->lock);
  38
  39 #ifdef CONFIG_MAC80211_HT_DEBUG
  40         printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n",
  41                sta->sta.addr, tid);
  42 #endif /* CONFIG_MAC80211_HT_DEBUG */
  43
  44         if (drv_ampdu_action(local, &sta->sdata->vif,
  45                              IEEE80211_AMPDU_RX_STOP,
  46                              &sta->sta, tid, NULL))
  47                 printk(KERN_DEBUG "HW problem - can not stop rx "
  48                                 "aggregation for tid %d\n", tid);
  49
  50         /* shutdown timer has not expired */
  51         if (initiator != WLAN_BACK_TIMER)
  52                 del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
  53
  54         /* check if this is a self generated aggregation halt */
  55         if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER)
  56                 ieee80211_send_delba(sta->sdata, sta->sta.addr,
  57                                      tid, 0, reason);
  58
  59         /* free the reordering buffer */
  60         for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) {
  61                 if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) {
  62                         /* release the reordered frames */
  63                         dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]);
  64                         sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--;
  65                         sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL;
  66                 }
  67         }
  68
  69         spin_lock_bh(&sta->lock);
  70         /* free resources */
  71         kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf);
  72         kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time);
  73
  74         if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) {
  75                 kfree(sta->ampdu_mlme.tid_rx[tid]);
  76                 sta->ampdu_mlme.tid_rx[tid] = NULL;
  77         }
  78
  79         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE;
  80         spin_unlock_bh(&sta->lock);
  81 }
  82
  83 void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid,
  84                                         u16 initiator, u16 reason)
  85 {
  86         struct ieee80211_local *local = sdata->local;
  87         struct sta_info *sta;
  88
  89         /* stop HW Rx aggregation. ampdu_action existence
  90          * already verified in session init so we add the BUG_ON */
  91         BUG_ON(!local->ops->ampdu_action);
  92
  93         rcu_read_lock();
  94
  95         sta = sta_info_get(local, ra);
  96         if (!sta) {
  97                 rcu_read_unlock();
  98                 return;
  99         }
 100
 101         __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason);
 102
 103         rcu_read_unlock();
 104 }
 105
 106 /*
 107  * After accepting the AddBA Request we activated a timer,
 108  * resetting it after each frame that arrives from the originator.
 109  * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed.
 110  */
 111 static void sta_rx_agg_session_timer_expired(unsigned long data)
 112 {
 113         /* not an elegant detour, but there is no choice as the timer passes
 114          * only one argument, and various sta_info are needed here, so init
 115          * flow in sta_info_create gives the TID as data, while the timer_to_id
 116          * array gives the sta through container_of */
 117         u8 *ptid = (u8 *)data;
 118         u8 *timer_to_id = ptid - *ptid;
 119         struct sta_info *sta = container_of(timer_to_id, struct sta_info,
 120                                          timer_to_tid[0]);
 121
 122 #ifdef CONFIG_MAC80211_HT_DEBUG
 123         printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid);
 124 #endif
 125         ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr,
 126                                          (u16)*ptid, WLAN_BACK_TIMER,
 127                                          WLAN_REASON_QSTA_TIMEOUT);
 128 }
 129
 130 static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
 131                                       u8 dialog_token, u16 status, u16 policy,
 132                                       u16 buf_size, u16 timeout)
 133 {
 134         struct ieee80211_local *local = sdata->local;
 135         struct sk_buff *skb;
 136         struct ieee80211_mgmt *mgmt;
 137         u16 capab;
 138
 139         skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
 140
 141         if (!skb) {
 142                 printk(KERN_DEBUG "%s: failed to allocate buffer "
 143                        "for addba resp frame\n", sdata->dev->name);
 144                 return;
 145         }
 146
 147         skb_reserve(skb, local->hw.extra_tx_headroom);
 148         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
 149         memset(mgmt, 0, 24);
 150         memcpy(mgmt->da, da, ETH_ALEN);
 151         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 152         if (sdata->vif.type == NL80211_IFTYPE_AP ||
 153             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 154                 memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN);
 155         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 156                 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
 157
 158         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
 159                                           IEEE80211_STYPE_ACTION);
 160
 161         skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
 162         mgmt->u.action.category = WLAN_CATEGORY_BACK;
 163         mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
 164         mgmt->u.action.u.addba_resp.dialog_token = dialog_token;
 165
 166         capab = (u16)(policy << 1);     /* bit 1 aggregation policy */
 167         capab |= (u16)(tid << 2);       /* bit 5:2 TID number */
 168         capab |= (u16)(buf_size << 6);  /* bit 15:6 max size of aggregation */
 169
 170         mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
 171         mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
 172         mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);
 173
 174         ieee80211_tx_skb(sdata, skb);
 175 }
 176
 177 void ieee80211_process_addba_request(struct ieee80211_local *local,
 178                                      struct sta_info *sta,
 179                                      struct ieee80211_mgmt *mgmt,
 180                                      size_t len)
 181 {
 182         struct ieee80211_hw *hw = &local->hw;
 183         struct ieee80211_conf *conf = &hw->conf;
 184         struct tid_ampdu_rx *tid_agg_rx;
 185         u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
 186         u8 dialog_token;
 187         int ret = -EOPNOTSUPP;
 188
 189         /* extract session parameters from addba request frame */
 190         dialog_token = mgmt->u.action.u.addba_req.dialog_token;
 191         timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
 192         start_seq_num =
 193                 le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
 194
 195         capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
 196         ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
 197         tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
 198         buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;
 199
 200         status = WLAN_STATUS_REQUEST_DECLINED;
 201
 202         if (test_sta_flags(sta, WLAN_STA_SUSPEND)) {
 203 #ifdef CONFIG_MAC80211_HT_DEBUG
 204                 printk(KERN_DEBUG "Suspend in progress. "
 205                        "Denying ADDBA request\n");
 206 #endif
 207                 goto end_no_lock;
 208         }
 209
 210         /* sanity check for incoming parameters:
 211          * check if configuration can support the BA policy
 212          * and if buffer size does not exceeds max value */
 213         /* XXX: check own ht delayed BA capability?? */
 214         if (((ba_policy != 1)
 215                 && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA)))
 216                 || (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
 217                 status = WLAN_STATUS_INVALID_QOS_PARAM;
 218 #ifdef CONFIG_MAC80211_HT_DEBUG
 219                 if (net_ratelimit())
 220                         printk(KERN_DEBUG "AddBA Req with bad params from "
 221                                 "%pM on tid %u. policy %d, buffer size %d\n",
 222                                 mgmt->sa, tid, ba_policy,
 223                                 buf_size);
 224 #endif /* CONFIG_MAC80211_HT_DEBUG */
 225                 goto end_no_lock;
 226         }
 227         /* determine default buffer size */
 228         if (buf_size == 0) {
 229                 struct ieee80211_supported_band *sband;
 230
 231                 sband = local->hw.wiphy->bands[conf->channel->band];
 232                 buf_size = IEEE80211_MIN_AMPDU_BUF;
 233                 buf_size = buf_size << sband->ht_cap.ampdu_factor;
 234         }
 235
 236
 237         /* examine state machine */
 238         spin_lock_bh(&sta->lock);
 239
 240         if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
 241 #ifdef CONFIG_MAC80211_HT_DEBUG
 242                 if (net_ratelimit())
 243                         printk(KERN_DEBUG "unexpected AddBA Req from "
 244                                 "%pM on tid %u\n",
 245                                 mgmt->sa, tid);
 246 #endif /* CONFIG_MAC80211_HT_DEBUG */
 247                 goto end;
 248         }
 249
 250         /* prepare A-MPDU MLME for Rx aggregation */
 251         sta->ampdu_mlme.tid_rx[tid] =
 252                         kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
 253         if (!sta->ampdu_mlme.tid_rx[tid]) {
 254 #ifdef CONFIG_MAC80211_HT_DEBUG
 255                 if (net_ratelimit())
 256                         printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
 257                                         tid);
 258 #endif
 259                 goto end;
 260         }
 261         /* rx timer */
 262         sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
 263                                 sta_rx_agg_session_timer_expired;
 264         sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
 265                                 (unsigned long)&sta->timer_to_tid[tid];
 266         init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);
 267
 268         tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];
 269
 270         /* prepare reordering buffer */
 271         tid_agg_rx->reorder_buf =
 272                 kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC);
 273         tid_agg_rx->reorder_time =
 274                 kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC);
 275         if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) {
 276 #ifdef CONFIG_MAC80211_HT_DEBUG
 277                 if (net_ratelimit())
 278                         printk(KERN_ERR "can not allocate reordering buffer "
 279                                "to tid %d\n", tid);
 280 #endif
 281                 kfree(tid_agg_rx->reorder_buf);
 282                 kfree(tid_agg_rx->reorder_time);
 283                 kfree(sta->ampdu_mlme.tid_rx[tid]);
 284                 sta->ampdu_mlme.tid_rx[tid] = NULL;
 285                 goto end;
 286         }
 287
 288         ret = drv_ampdu_action(local, &sta->sdata->vif,
 289                                IEEE80211_AMPDU_RX_START,
 290                                &sta->sta, tid, &start_seq_num);
 291 #ifdef CONFIG_MAC80211_HT_DEBUG
 292         printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
 293 #endif /* CONFIG_MAC80211_HT_DEBUG */
 294
 295         if (ret) {
 296                 kfree(tid_agg_rx->reorder_buf);
 297                 kfree(tid_agg_rx);
 298                 sta->ampdu_mlme.tid_rx[tid] = NULL;
 299                 goto end;
 300         }
 301
 302         /* change state and send addba resp */
 303         sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
 304         tid_agg_rx->dialog_token = dialog_token;
 305         tid_agg_rx->ssn = start_seq_num;
 306         tid_agg_rx->head_seq_num = start_seq_num;
 307         tid_agg_rx->buf_size = buf_size;
 308         tid_agg_rx->timeout = timeout;
 309         tid_agg_rx->stored_mpdu_num = 0;
 310         status = WLAN_STATUS_SUCCESS;
 311 end:
 312         spin_unlock_bh(&sta->lock);
 313
 314 end_no_lock:
 315         ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid,
 316                                   dialog_token, status, 1, buf_size, timeout);
 317 }