/* * HT handling * * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> * Copyright 2007, Michael Wu <flamingice@sourmilk.net> * Copyright 2007-2008, Intel Corporation * * 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/ieee80211.h> #include <net/mac80211.h> #include "ieee80211_i.h" #include "driver-ops.h" void __ieee80211_stop_rx_ba_session(struct sta_info *sta, u16 tid, u16 initiator, u16 reason) { struct ieee80211_local *local = sta->local; int i; /* check if TID is in operational state */ spin_lock_bh(&sta->lock); if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) { spin_unlock_bh(&sta->lock); return; } sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_REQ_STOP_BA_MSK | (initiator << HT_AGG_STATE_INITIATOR_SHIFT); spin_unlock_bh(&sta->lock); #ifdef CONFIG_MAC80211_HT_DEBUG printk(KERN_DEBUG "Rx BA session stop requested for %pM tid %u\n", sta->sta.addr, tid); #endif /* CONFIG_MAC80211_HT_DEBUG */ if (drv_ampdu_action(local, IEEE80211_AMPDU_RX_STOP, &sta->sta, tid, NULL)) printk(KERN_DEBUG "HW problem - can not stop rx " "aggregation for tid %d\n", tid); /* shutdown timer has not expired */ if (initiator != WLAN_BACK_TIMER) del_timer_sync(&sta->ampdu_mlme.tid_rx[tid]->session_timer); /* check if this is a self generated aggregation halt */ if (initiator == WLAN_BACK_RECIPIENT || initiator == WLAN_BACK_TIMER) ieee80211_send_delba(sta->sdata, sta->sta.addr, tid, 0, reason); /* free the reordering buffer */ for (i = 0; i < sta->ampdu_mlme.tid_rx[tid]->buf_size; i++) { if (sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]) { /* release the reordered frames */ dev_kfree_skb(sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i]); sta->ampdu_mlme.tid_rx[tid]->stored_mpdu_num--; sta->ampdu_mlme.tid_rx[tid]->reorder_buf[i] = NULL; } } spin_lock_bh(&sta->lock); /* free resources */ kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_time); if (!sta->ampdu_mlme.tid_rx[tid]->shutdown) { kfree(sta->ampdu_mlme.tid_rx[tid]); sta->ampdu_mlme.tid_rx[tid] = NULL; } sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_IDLE; spin_unlock_bh(&sta->lock); } void ieee80211_sta_stop_rx_ba_session(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 initiator, u16 reason) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; /* stop HW Rx aggregation. ampdu_action existence * already verified in session init so we add the BUG_ON */ BUG_ON(!local->ops->ampdu_action); rcu_read_lock(); sta = sta_info_get(local, ra); if (!sta) { rcu_read_unlock(); return; } __ieee80211_stop_rx_ba_session(sta, tid, initiator, reason); rcu_read_unlock(); } /* * After accepting the AddBA Request we activated a timer, * resetting it after each frame that arrives from the originator. * if this timer expires ieee80211_sta_stop_rx_ba_session will be executed. */ static void sta_rx_agg_session_timer_expired(unsigned long data) { /* not an elegant detour, but there is no choice as the timer passes * only one argument, and various sta_info are needed here, so init * flow in sta_info_create gives the TID as data, while the timer_to_id * array gives the sta through container_of */ u8 *ptid = (u8 *)data; u8 *timer_to_id = ptid - *ptid; struct sta_info *sta = container_of(timer_to_id, struct sta_info, timer_to_tid[0]); #ifdef CONFIG_MAC80211_HT_DEBUG printk(KERN_DEBUG "rx session timer expired on tid %d\n", (u16)*ptid); #endif ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, (u16)*ptid, WLAN_BACK_TIMER, WLAN_REASON_QSTA_TIMEOUT); } static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid, u8 dialog_token, u16 status, u16 policy, u16 buf_size, u16 timeout) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u16 capab; skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); if (!skb) { printk(KERN_DEBUG "%s: failed to allocate buffer " "for addba resp frame\n", sdata->dev->name); return; } skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, da, ETH_ALEN); memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN); if (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_AP_VLAN) memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); else if (sdata->vif.type == NL80211_IFTYPE_STATION) memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION); skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp)); mgmt->u.action.category = WLAN_CATEGORY_BACK; mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP; mgmt->u.action.u.addba_resp.dialog_token = dialog_token; capab = (u16)(policy << 1); /* bit 1 aggregation policy */ capab |= (u16)(tid << 2); /* bit 5:2 TID number */ capab |= (u16)(buf_size << 6); /* bit 15:6 max size of aggregation */ mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab); mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout); mgmt->u.action.u.addba_resp.status = cpu_to_le16(status); ieee80211_tx_skb(sdata, skb, 1); } void ieee80211_process_addba_request(struct ieee80211_local *local, struct sta_info *sta, struct ieee80211_mgmt *mgmt, size_t len) { struct ieee80211_hw *hw = &local->hw; struct ieee80211_conf *conf = &hw->conf; struct tid_ampdu_rx *tid_agg_rx; u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status; u8 dialog_token; int ret = -EOPNOTSUPP; /* extract session parameters from addba request frame */ dialog_token = mgmt->u.action.u.addba_req.dialog_token; timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout); start_seq_num = le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4; capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab); ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1; tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2; buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6; status = WLAN_STATUS_REQUEST_DECLINED; if (test_sta_flags(sta, WLAN_STA_SUSPEND)) { #ifdef CONFIG_MAC80211_HT_DEBUG printk(KERN_DEBUG "Suspend in progress. " "Denying ADDBA request\n"); #endif goto end_no_lock; } /* sanity check for incoming parameters: * check if configuration can support the BA policy * and if buffer size does not exceeds max value */ /* XXX: check own ht delayed BA capability?? */ if (((ba_policy != 1) && (!(sta->sta.ht_cap.cap & IEEE80211_HT_CAP_DELAY_BA))) || (buf_size > IEEE80211_MAX_AMPDU_BUF)) { status = WLAN_STATUS_INVALID_QOS_PARAM; #ifdef CONFIG_MAC80211_HT_DEBUG if (net_ratelimit()) printk(KERN_DEBUG "AddBA Req with bad params from " "%pM on tid %u. policy %d, buffer size %d\n", mgmt->sa, tid, ba_policy, buf_size); #endif /* CONFIG_MAC80211_HT_DEBUG */ goto end_no_lock; } /* determine default buffer size */ if (buf_size == 0) { struct ieee80211_supported_band *sband; sband = local->hw.wiphy->bands[conf->channel->band]; buf_size = IEEE80211_MIN_AMPDU_BUF; buf_size = buf_size << sband->ht_cap.ampdu_factor; } /* examine state machine */ spin_lock_bh(&sta->lock); if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) { #ifdef CONFIG_MAC80211_HT_DEBUG if (net_ratelimit()) printk(KERN_DEBUG "unexpected AddBA Req from " "%pM on tid %u\n", mgmt->sa, tid); #endif /* CONFIG_MAC80211_HT_DEBUG */ goto end; } /* prepare A-MPDU MLME for Rx aggregation */ sta->ampdu_mlme.tid_rx[tid] = kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC); if (!sta->ampdu_mlme.tid_rx[tid]) { #ifdef CONFIG_MAC80211_HT_DEBUG if (net_ratelimit()) printk(KERN_ERR "allocate rx mlme to tid %d failed\n", tid); #endif goto end; } /* rx timer */ sta->ampdu_mlme.tid_rx[tid]->session_timer.function = sta_rx_agg_session_timer_expired; sta->ampdu_mlme.tid_rx[tid]->session_timer.data = (unsigned long)&sta->timer_to_tid[tid]; init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer); tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; /* prepare reordering buffer */ tid_agg_rx->reorder_buf = kcalloc(buf_size, sizeof(struct sk_buff *), GFP_ATOMIC); tid_agg_rx->reorder_time = kcalloc(buf_size, sizeof(unsigned long), GFP_ATOMIC); if (!tid_agg_rx->reorder_buf || !tid_agg_rx->reorder_time) { #ifdef CONFIG_MAC80211_HT_DEBUG if (net_ratelimit()) printk(KERN_ERR "can not allocate reordering buffer " "to tid %d\n", tid); #endif kfree(tid_agg_rx->reorder_buf); kfree(tid_agg_rx->reorder_time); kfree(sta->ampdu_mlme.tid_rx[tid]); sta->ampdu_mlme.tid_rx[tid] = NULL; goto end; } ret = drv_ampdu_action(local, IEEE80211_AMPDU_RX_START, &sta->sta, tid, &start_seq_num); #ifdef CONFIG_MAC80211_HT_DEBUG printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret); #endif /* CONFIG_MAC80211_HT_DEBUG */ if (ret) { kfree(tid_agg_rx->reorder_buf); kfree(tid_agg_rx); sta->ampdu_mlme.tid_rx[tid] = NULL; goto end; } /* change state and send addba resp */ sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL; tid_agg_rx->dialog_token = dialog_token; tid_agg_rx->ssn = start_seq_num; tid_agg_rx->head_seq_num = start_seq_num; tid_agg_rx->buf_size = buf_size; tid_agg_rx->timeout = timeout; tid_agg_rx->stored_mpdu_num = 0; status = WLAN_STATUS_SUCCESS; end: spin_unlock_bh(&sta->lock); end_no_lock: ieee80211_send_addba_resp(sta->sdata, sta->sta.addr, tid, dialog_token, status, 1, buf_size, timeout); }