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 "rate.h" 20 21 void 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) 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 } 103 104 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta) 105 { 106 int i; 107 108 for (i = 0; i < STA_TID_NUM; i++) { 109 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR); 110 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 111 WLAN_REASON_QSTA_LEAVE_QBSS); 112 } 113 } 114 115 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 116 const u8 *da, u16 tid, 117 u16 initiator, u16 reason_code) 118 { 119 struct ieee80211_local *local = sdata->local; 120 struct sk_buff *skb; 121 struct ieee80211_mgmt *mgmt; 122 u16 params; 123 124 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 125 126 if (!skb) { 127 printk(KERN_ERR "%s: failed to allocate buffer " 128 "for delba frame\n", sdata->name); 129 return; 130 } 131 132 skb_reserve(skb, local->hw.extra_tx_headroom); 133 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 134 memset(mgmt, 0, 24); 135 memcpy(mgmt->da, da, ETH_ALEN); 136 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 137 if (sdata->vif.type == NL80211_IFTYPE_AP || 138 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 139 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 140 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 141 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 142 143 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 144 IEEE80211_STYPE_ACTION); 145 146 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 147 148 mgmt->u.action.category = WLAN_CATEGORY_BACK; 149 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 150 params = (u16)(initiator << 11); /* bit 11 initiator */ 151 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 152 153 mgmt->u.action.u.delba.params = cpu_to_le16(params); 154 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 155 156 ieee80211_tx_skb(sdata, skb); 157 } 158 159 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 160 struct sta_info *sta, 161 struct ieee80211_mgmt *mgmt, size_t len) 162 { 163 u16 tid, params; 164 u16 initiator; 165 166 params = le16_to_cpu(mgmt->u.action.u.delba.params); 167 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 168 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 169 170 #ifdef CONFIG_MAC80211_HT_DEBUG 171 if (net_ratelimit()) 172 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", 173 mgmt->sa, initiator ? "initiator" : "recipient", tid, 174 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 175 #endif /* CONFIG_MAC80211_HT_DEBUG */ 176 177 if (initiator == WLAN_BACK_INITIATOR) 178 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0); 179 else { /* WLAN_BACK_RECIPIENT */ 180 spin_lock_bh(&sta->lock); 181 if (sta->ampdu_mlme.tid_state_tx[tid] & HT_ADDBA_REQUESTED_MSK) 182 ___ieee80211_stop_tx_ba_session(sta, tid, 183 WLAN_BACK_RECIPIENT); 184 spin_unlock_bh(&sta->lock); 185 } 186 } 187 188 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 189 enum ieee80211_smps_mode smps, const u8 *da, 190 const u8 *bssid) 191 { 192 struct ieee80211_local *local = sdata->local; 193 struct sk_buff *skb; 194 struct ieee80211_mgmt *action_frame; 195 196 /* 27 = header + category + action + smps mode */ 197 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 198 if (!skb) 199 return -ENOMEM; 200 201 skb_reserve(skb, local->hw.extra_tx_headroom); 202 action_frame = (void *)skb_put(skb, 27); 203 memcpy(action_frame->da, da, ETH_ALEN); 204 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 205 memcpy(action_frame->bssid, bssid, ETH_ALEN); 206 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 207 IEEE80211_STYPE_ACTION); 208 action_frame->u.action.category = WLAN_CATEGORY_HT; 209 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 210 switch (smps) { 211 case IEEE80211_SMPS_AUTOMATIC: 212 case IEEE80211_SMPS_NUM_MODES: 213 WARN_ON(1); 214 case IEEE80211_SMPS_OFF: 215 action_frame->u.action.u.ht_smps.smps_control = 216 WLAN_HT_SMPS_CONTROL_DISABLED; 217 break; 218 case IEEE80211_SMPS_STATIC: 219 action_frame->u.action.u.ht_smps.smps_control = 220 WLAN_HT_SMPS_CONTROL_STATIC; 221 break; 222 case IEEE80211_SMPS_DYNAMIC: 223 action_frame->u.action.u.ht_smps.smps_control = 224 WLAN_HT_SMPS_CONTROL_DYNAMIC; 225 break; 226 } 227 228 /* we'll do more on status of this frame */ 229 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 230 ieee80211_tx_skb(sdata, skb); 231 232 return 0; 233 } 234