| /* |
| * HT handling |
| * |
| * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> |
| * Copyright 2004, Instant802 Networks, Inc. |
| * Copyright 2005, 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/wireless.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| #include "sta_info.h" |
| |
| int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie, |
| struct ieee80211_ht_info *ht_info) |
| { |
| |
| if (ht_info == NULL) |
| return -EINVAL; |
| |
| memset(ht_info, 0, sizeof(*ht_info)); |
| |
| if (ht_cap_ie) { |
| u8 ampdu_info = ht_cap_ie->ampdu_params_info; |
| |
| ht_info->ht_supported = 1; |
| ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info); |
| ht_info->ampdu_factor = |
| ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR; |
| ht_info->ampdu_density = |
| (ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2; |
| memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16); |
| } else |
| ht_info->ht_supported = 0; |
| |
| return 0; |
| } |
| |
| int ieee80211_ht_addt_info_ie_to_ht_bss_info( |
| struct ieee80211_ht_addt_info *ht_add_info_ie, |
| struct ieee80211_ht_bss_info *bss_info) |
| { |
| if (bss_info == NULL) |
| return -EINVAL; |
| |
| memset(bss_info, 0, sizeof(*bss_info)); |
| |
| if (ht_add_info_ie) { |
| u16 op_mode; |
| op_mode = le16_to_cpu(ht_add_info_ie->operation_mode); |
| |
| bss_info->primary_channel = ht_add_info_ie->control_chan; |
| bss_info->bss_cap = ht_add_info_ie->ht_param; |
| bss_info->bss_op_mode = (u8)(op_mode & 0xff); |
| } |
| |
| return 0; |
| } |
| |
| void ieee80211_send_addba_request(struct ieee80211_sub_if_data *sdata, const u8 *da, |
| u16 tid, u8 dialog_token, u16 start_seq_num, |
| u16 agg_size, u16 timeout) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
| 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_ERR "%s: failed to allocate buffer " |
| "for addba request 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 == IEEE80211_IF_TYPE_AP) |
| memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
| else |
| memcpy(mgmt->bssid, ifsta->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_req)); |
| |
| mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ; |
| |
| mgmt->u.action.u.addba_req.dialog_token = dialog_token; |
| capab = (u16)(1 << 1); /* bit 1 aggregation policy */ |
| capab |= (u16)(tid << 2); /* bit 5:2 TID number */ |
| capab |= (u16)(agg_size << 6); /* bit 15:6 max size of aggergation */ |
| |
| mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab); |
| |
| mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout); |
| mgmt->u.action.u.addba_req.start_seq_num = |
| cpu_to_le16(start_seq_num << 4); |
| |
| ieee80211_sta_tx(sdata, skb, 0); |
| } |
| |
| void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid, |
| u16 initiator, u16 reason_code) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_if_sta *ifsta = &sdata->u.sta; |
| struct sk_buff *skb; |
| struct ieee80211_mgmt *mgmt; |
| u16 params; |
| |
| skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); |
| |
| if (!skb) { |
| printk(KERN_ERR "%s: failed to allocate buffer " |
| "for delba 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 == IEEE80211_IF_TYPE_AP) |
| memcpy(mgmt->bssid, sdata->dev->dev_addr, ETH_ALEN); |
| else |
| memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN); |
| mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| IEEE80211_STYPE_ACTION); |
| |
| skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); |
| |
| mgmt->u.action.category = WLAN_CATEGORY_BACK; |
| mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; |
| params = (u16)(initiator << 11); /* bit 11 initiator */ |
| params |= (u16)(tid << 12); /* bit 15:12 TID number */ |
| |
| mgmt->u.action.u.delba.params = cpu_to_le16(params); |
| mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); |
| |
| ieee80211_sta_tx(sdata, skb, 0); |
| } |
| |
| void ieee80211_send_bar(struct ieee80211_sub_if_data *sdata, u8 *ra, u16 tid, u16 ssn) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sk_buff *skb; |
| struct ieee80211_bar *bar; |
| u16 bar_control = 0; |
| |
| skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom); |
| if (!skb) { |
| printk(KERN_ERR "%s: failed to allocate buffer for " |
| "bar frame\n", sdata->dev->name); |
| return; |
| } |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar)); |
| memset(bar, 0, sizeof(*bar)); |
| bar->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | |
| IEEE80211_STYPE_BACK_REQ); |
| memcpy(bar->ra, ra, ETH_ALEN); |
| memcpy(bar->ta, sdata->dev->dev_addr, ETH_ALEN); |
| bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL; |
| bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA; |
| bar_control |= (u16)(tid << 12); |
| bar->control = cpu_to_le16(bar_control); |
| bar->start_seq_num = cpu_to_le16(ssn); |
| |
| ieee80211_sta_tx(sdata, skb, 0); |
| } |
| |
| 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 ieee80211_hw *hw = &local->hw; |
| struct sta_info *sta; |
| int ret, i; |
| DECLARE_MAC_BUF(mac); |
| |
| rcu_read_lock(); |
| |
| sta = sta_info_get(local, ra); |
| if (!sta) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| /* 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); |
| rcu_read_unlock(); |
| 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); |
| |
| /* stop HW Rx aggregation. ampdu_action existence |
| * already verified in session init so we add the BUG_ON */ |
| BUG_ON(!local->ops->ampdu_action); |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "Rx BA session stop requested for %s tid %u\n", |
| print_mac(mac, ra), tid); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_STOP, |
| ra, tid, NULL); |
| if (ret) |
| 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(sdata, ra, 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; |
| } |
| } |
| /* free resources */ |
| kfree(sta->ampdu_mlme.tid_rx[tid]->reorder_buf); |
| 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; |
| |
| rcu_read_unlock(); |
| } |
| |
| |
| /* |
| * After sending add Block Ack request we activated a timer until |
| * add Block Ack response will arrive from the recipient. |
| * If this timer expires sta_addba_resp_timer_expired will be executed. |
| */ |
| void sta_addba_resp_timer_expired(unsigned long data) |
| { |
| /* not an elegant detour, but there is no choice as the timer passes |
| * only one argument, and both sta_info and TID are needed, so init |
| * flow in sta_info_create gives the TID as data, while the timer_to_id |
| * array gives the sta through container_of */ |
| u16 tid = *(u8 *)data; |
| struct sta_info *temp_sta = container_of((void *)data, |
| struct sta_info, timer_to_tid[tid]); |
| |
| struct ieee80211_local *local = temp_sta->local; |
| struct ieee80211_hw *hw = &local->hw; |
| struct sta_info *sta; |
| u8 *state; |
| |
| rcu_read_lock(); |
| |
| sta = sta_info_get(local, temp_sta->addr); |
| if (!sta) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| state = &sta->ampdu_mlme.tid_state_tx[tid]; |
| /* check if the TID waits for addBA response */ |
| spin_lock_bh(&sta->lock); |
| if (!(*state & HT_ADDBA_REQUESTED_MSK)) { |
| spin_unlock_bh(&sta->lock); |
| *state = HT_AGG_STATE_IDLE; |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "timer expired on tid %d but we are not " |
| "expecting addBA response there", tid); |
| #endif |
| goto timer_expired_exit; |
| } |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| printk(KERN_DEBUG "addBA response timer expired on tid %d\n", tid); |
| #endif |
| |
| /* go through the state check in stop_BA_session */ |
| *state = HT_AGG_STATE_OPERATIONAL; |
| spin_unlock_bh(&sta->lock); |
| ieee80211_stop_tx_ba_session(hw, temp_sta->addr, tid, |
| WLAN_BACK_INITIATOR); |
| |
| timer_expired_exit: |
| rcu_read_unlock(); |
| } |
| |
| void ieee80211_sta_tear_down_BA_sessions(struct ieee80211_sub_if_data *sdata, u8 *addr) |
| { |
| struct ieee80211_local *local = sdata->local; |
| int i; |
| |
| for (i = 0; i < STA_TID_NUM; i++) { |
| ieee80211_stop_tx_ba_session(&local->hw, addr, i, |
| WLAN_BACK_INITIATOR); |
| ieee80211_sta_stop_rx_ba_session(sdata, addr, i, |
| WLAN_BACK_RECIPIENT, |
| WLAN_REASON_QSTA_LEAVE_QBSS); |
| } |
| } |
| |