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 2007-2010, 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 "rate.h" 20 21void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband, 22 struct ieee80211_ht_cap *ht_cap_ie, 23 struct ieee80211_sta_ht_cap *ht_cap) 24{ 25 u8 ampdu_info, tx_mcs_set_cap; 26 int i, max_tx_streams; 27 28 BUG_ON(!ht_cap); 29 30 memset(ht_cap, 0, sizeof(*ht_cap)); 31 32 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 33 return; 34 35 ht_cap->ht_supported = true; 36 37 /* 38 * The bits listed in this expression should be 39 * the same for the peer and us, if the station 40 * advertises more then we can't use those thus 41 * we mask them out. 42 */ 43 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & 44 (sband->ht_cap.cap | 45 ~(IEEE80211_HT_CAP_LDPC_CODING | 46 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 47 IEEE80211_HT_CAP_GRN_FLD | 48 IEEE80211_HT_CAP_SGI_20 | 49 IEEE80211_HT_CAP_SGI_40 | 50 IEEE80211_HT_CAP_DSSSCCK40)); 51 /* 52 * The STBC bits are asymmetric -- if we don't have 53 * TX then mask out the peer's RX and vice versa. 54 */ 55 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 56 ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; 57 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 58 ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC; 59 60 ampdu_info = ht_cap_ie->ampdu_params_info; 61 ht_cap->ampdu_factor = 62 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 63 ht_cap->ampdu_density = 64 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 65 66 /* own MCS TX capabilities */ 67 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; 68 69 /* can we TX with MCS rates? */ 70 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 71 return; 72 73 /* Counting from 0, therefore +1 */ 74 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 75 max_tx_streams = 76 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 77 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 78 else 79 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 80 81 /* 82 * 802.11n D5.0 20.3.5 / 20.6 says: 83 * - indices 0 to 7 and 32 are single spatial stream 84 * - 8 to 31 are multiple spatial streams using equal modulation 85 * [8..15 for two streams, 16..23 for three and 24..31 for four] 86 * - remainder are multiple spatial streams using unequal modulation 87 */ 88 for (i = 0; i < max_tx_streams; i++) 89 ht_cap->mcs.rx_mask[i] = 90 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 91 92 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 93 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 94 i < IEEE80211_HT_MCS_MASK_LEN; i++) 95 ht_cap->mcs.rx_mask[i] = 96 sband->ht_cap.mcs.rx_mask[i] & 97 ht_cap_ie->mcs.rx_mask[i]; 98 99 /* handle MCS rate 32 too */ 100 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 101 ht_cap->mcs.rx_mask[32/8] |= 1; 102} 103 104void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) 105{ 106 int i; 107 108 cancel_work_sync(&sta->ampdu_mlme.work); 109 110 for (i = 0; i < STA_TID_NUM; i++) { 111 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); 112 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 113 WLAN_REASON_QSTA_LEAVE_QBSS); 114 } 115} 116 117void ieee80211_ba_session_work(struct work_struct *work) 118{ 119 struct sta_info *sta = 120 container_of(work, struct sta_info, ampdu_mlme.work); 121 struct tid_ampdu_tx *tid_tx; 122 int tid; 123 124 /* 125 * When this flag is set, new sessions should be 126 * blocked, and existing sessions will be torn 127 * down by the code that set the flag, so this 128 * need not run. 129 */ 130 if (test_sta_flags(sta, WLAN_STA_BLOCK_BA)) 131 return; 132 133 mutex_lock(&sta->ampdu_mlme.mtx); 134 for (tid = 0; tid < STA_TID_NUM; tid++) { 135 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 136 ___ieee80211_stop_rx_ba_session( 137 sta, tid, WLAN_BACK_RECIPIENT, 138 WLAN_REASON_QSTA_TIMEOUT); 139 140 tid_tx = sta->ampdu_mlme.tid_tx[tid]; 141 if (!tid_tx) 142 continue; 143 144 if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) 145 ieee80211_tx_ba_session_handle_start(sta, tid); 146 else if (test_and_clear_bit(HT_AGG_STATE_WANT_STOP, 147 &tid_tx->state)) 148 ___ieee80211_stop_tx_ba_session(sta, tid, 149 WLAN_BACK_INITIATOR); 150 } 151 mutex_unlock(&sta->ampdu_mlme.mtx); 152} 153 154void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 155 const u8 *da, u16 tid, 156 u16 initiator, u16 reason_code) 157{ 158 struct ieee80211_local *local = sdata->local; 159 struct sk_buff *skb; 160 struct ieee80211_mgmt *mgmt; 161 u16 params; 162 163 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 164 165 if (!skb) { 166 printk(KERN_ERR "%s: failed to allocate buffer " 167 "for delba frame\n", sdata->name); 168 return; 169 } 170 171 skb_reserve(skb, local->hw.extra_tx_headroom); 172 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 173 memset(mgmt, 0, 24); 174 memcpy(mgmt->da, da, ETH_ALEN); 175 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 176 if (sdata->vif.type == NL80211_IFTYPE_AP || 177 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 178 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 179 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 180 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 181 182 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 183 IEEE80211_STYPE_ACTION); 184 185 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 186 187 mgmt->u.action.category = WLAN_CATEGORY_BACK; 188 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 189 params = (u16)(initiator << 11); /* bit 11 initiator */ 190 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 191 192 mgmt->u.action.u.delba.params = cpu_to_le16(params); 193 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 194 195 ieee80211_tx_skb(sdata, skb); 196} 197 198void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 199 struct sta_info *sta, 200 struct ieee80211_mgmt *mgmt, size_t len) 201{ 202 u16 tid, params; 203 u16 initiator; 204 205 params = le16_to_cpu(mgmt->u.action.u.delba.params); 206 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 207 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 208 209#ifdef CONFIG_MAC80211_HT_DEBUG 210 if (net_ratelimit()) 211 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", 212 mgmt->sa, initiator ? "initiator" : "recipient", tid, 213 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 214#endif /* CONFIG_MAC80211_HT_DEBUG */ 215 216 if (initiator == WLAN_BACK_INITIATOR) 217 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0); 218 else 219 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT); 220} 221 222int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 223 enum ieee80211_smps_mode smps, const u8 *da, 224 const u8 *bssid) 225{ 226 struct ieee80211_local *local = sdata->local; 227 struct sk_buff *skb; 228 struct ieee80211_mgmt *action_frame; 229 230 /* 27 = header + category + action + smps mode */ 231 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 232 if (!skb) 233 return -ENOMEM; 234 235 skb_reserve(skb, local->hw.extra_tx_headroom); 236 action_frame = (void *)skb_put(skb, 27); 237 memcpy(action_frame->da, da, ETH_ALEN); 238 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 239 memcpy(action_frame->bssid, bssid, ETH_ALEN); 240 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 241 IEEE80211_STYPE_ACTION); 242 action_frame->u.action.category = WLAN_CATEGORY_HT; 243 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 244 switch (smps) { 245 case IEEE80211_SMPS_AUTOMATIC: 246 case IEEE80211_SMPS_NUM_MODES: 247 WARN_ON(1); 248 case IEEE80211_SMPS_OFF: 249 action_frame->u.action.u.ht_smps.smps_control = 250 WLAN_HT_SMPS_CONTROL_DISABLED; 251 break; 252 case IEEE80211_SMPS_STATIC: 253 action_frame->u.action.u.ht_smps.smps_control = 254 WLAN_HT_SMPS_CONTROL_STATIC; 255 break; 256 case IEEE80211_SMPS_DYNAMIC: 257 action_frame->u.action.u.ht_smps.smps_control = 258 WLAN_HT_SMPS_CONTROL_DYNAMIC; 259 break; 260 } 261 262 /* we'll do more on status of this frame */ 263 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 264 ieee80211_tx_skb(sdata, skb); 265 266 return 0; 267} 268