| /* |
| * 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/wireless.h> |
| #include <net/mac80211.h> |
| #include "ieee80211_i.h" |
| |
| void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband, |
| struct ieee80211_ht_cap *ht_cap_ie, |
| struct ieee80211_sta_ht_cap *ht_cap) |
| { |
| u8 ampdu_info, tx_mcs_set_cap; |
| int i, max_tx_streams; |
| |
| BUG_ON(!ht_cap); |
| |
| memset(ht_cap, 0, sizeof(*ht_cap)); |
| |
| if (!ht_cap_ie) |
| return; |
| |
| ht_cap->ht_supported = true; |
| |
| ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & sband->ht_cap.cap; |
| ht_cap->cap &= ~IEEE80211_HT_CAP_SM_PS; |
| ht_cap->cap |= sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS; |
| |
| ampdu_info = ht_cap_ie->ampdu_params_info; |
| ht_cap->ampdu_factor = |
| ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; |
| ht_cap->ampdu_density = |
| (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; |
| |
| /* own MCS TX capabilities */ |
| tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; |
| |
| /* can we TX with MCS rates? */ |
| if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) |
| return; |
| |
| /* Counting from 0, therefore +1 */ |
| if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) |
| max_tx_streams = |
| ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) |
| >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; |
| else |
| max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; |
| |
| /* |
| * 802.11n D5.0 20.3.5 / 20.6 says: |
| * - indices 0 to 7 and 32 are single spatial stream |
| * - 8 to 31 are multiple spatial streams using equal modulation |
| * [8..15 for two streams, 16..23 for three and 24..31 for four] |
| * - remainder are multiple spatial streams using unequal modulation |
| */ |
| for (i = 0; i < max_tx_streams; i++) |
| ht_cap->mcs.rx_mask[i] = |
| sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; |
| |
| if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) |
| for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; |
| i < IEEE80211_HT_MCS_MASK_LEN; i++) |
| ht_cap->mcs.rx_mask[i] = |
| sband->ht_cap.mcs.rx_mask[i] & |
| ht_cap_ie->mcs.rx_mask[i]; |
| |
| /* handle MCS rate 32 too */ |
| if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) |
| ht_cap->mcs.rx_mask[32/8] |= 1; |
| } |
| |
| /* |
| * ieee80211_enable_ht should be called only after the operating band |
| * has been determined as ht configuration depends on the hw's |
| * HT abilities for a specific band. |
| */ |
| u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_ht_info *hti, |
| u16 ap_ht_cap_flags) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_bss_ht_conf ht; |
| u32 changed = 0; |
| bool enable_ht = true, ht_changed; |
| enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT; |
| |
| sband = local->hw.wiphy->bands[local->hw.conf.channel->band]; |
| |
| memset(&ht, 0, sizeof(ht)); |
| |
| /* HT is not supported */ |
| if (!sband->ht_cap.ht_supported) |
| enable_ht = false; |
| |
| /* check that channel matches the right operating channel */ |
| if (local->hw.conf.channel->center_freq != |
| ieee80211_channel_to_frequency(hti->control_chan)) |
| enable_ht = false; |
| |
| if (enable_ht) { |
| channel_type = NL80211_CHAN_HT20; |
| |
| if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) && |
| (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) && |
| (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) { |
| switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { |
| case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: |
| channel_type = NL80211_CHAN_HT40PLUS; |
| break; |
| case IEEE80211_HT_PARAM_CHA_SEC_BELOW: |
| channel_type = NL80211_CHAN_HT40MINUS; |
| break; |
| } |
| } |
| } |
| |
| ht_changed = conf_is_ht(&local->hw.conf) != enable_ht || |
| channel_type != local->hw.conf.channel_type; |
| |
| local->oper_channel_type = channel_type; |
| |
| if (ht_changed) { |
| /* channel_type change automatically detected */ |
| ieee80211_hw_config(local, 0); |
| } |
| |
| /* disable HT */ |
| if (!enable_ht) |
| return 0; |
| |
| ht.operation_mode = le16_to_cpu(hti->operation_mode); |
| |
| /* if bss configuration changed store the new one */ |
| if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) { |
| changed |= BSS_CHANGED_HT; |
| sdata->vif.bss_conf.ht = ht; |
| } |
| |
| return changed; |
| } |
| |
| void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) |
| { |
| int i; |
| |
| for (i = 0; i < STA_TID_NUM; i++) { |
| __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); |
| __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, |
| WLAN_REASON_QSTA_LEAVE_QBSS); |
| } |
| } |
| |
| 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 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 == 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.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_tx_skb(sdata, skb, 1); |
| } |
| |
| void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, |
| struct sta_info *sta, |
| struct ieee80211_mgmt *mgmt, size_t len) |
| { |
| struct ieee80211_local *local = sdata->local; |
| u16 tid, params; |
| u16 initiator; |
| |
| params = le16_to_cpu(mgmt->u.action.u.delba.params); |
| tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; |
| initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", |
| mgmt->sa, initiator ? "initiator" : "recipient", tid, |
| mgmt->u.action.u.delba.reason_code); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| if (initiator == WLAN_BACK_INITIATOR) |
| ieee80211_sta_stop_rx_ba_session(sdata, sta->sta.addr, tid, |
| WLAN_BACK_INITIATOR, 0); |
| else { /* WLAN_BACK_RECIPIENT */ |
| spin_lock_bh(&sta->lock); |
| sta->ampdu_mlme.tid_state_tx[tid] = |
| HT_AGG_STATE_OPERATIONAL; |
| spin_unlock_bh(&sta->lock); |
| ieee80211_stop_tx_ba_session(&local->hw, sta->sta.addr, tid, |
| WLAN_BACK_RECIPIENT); |
| } |
| } |