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 <linux/export.h> 18 #include <net/mac80211.h> 19 #include "ieee80211_i.h" 20 #include "rate.h" 21 22 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_supported_band *sband, 23 struct ieee80211_ht_cap *ht_cap_ie, 24 struct ieee80211_sta_ht_cap *ht_cap) 25 { 26 u8 ampdu_info, tx_mcs_set_cap; 27 int i, max_tx_streams; 28 29 BUG_ON(!ht_cap); 30 31 memset(ht_cap, 0, sizeof(*ht_cap)); 32 33 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 34 return; 35 36 ht_cap->ht_supported = true; 37 38 /* 39 * The bits listed in this expression should be 40 * the same for the peer and us, if the station 41 * advertises more then we can't use those thus 42 * we mask them out. 43 */ 44 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & 45 (sband->ht_cap.cap | 46 ~(IEEE80211_HT_CAP_LDPC_CODING | 47 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 48 IEEE80211_HT_CAP_GRN_FLD | 49 IEEE80211_HT_CAP_SGI_20 | 50 IEEE80211_HT_CAP_SGI_40 | 51 IEEE80211_HT_CAP_DSSSCCK40)); 52 /* 53 * The STBC bits are asymmetric -- if we don't have 54 * TX then mask out the peer's RX and vice versa. 55 */ 56 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 57 ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; 58 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 59 ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC; 60 61 ampdu_info = ht_cap_ie->ampdu_params_info; 62 ht_cap->ampdu_factor = 63 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 64 ht_cap->ampdu_density = 65 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 66 67 /* own MCS TX capabilities */ 68 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; 69 70 /* Copy peer MCS TX capabilities, the driver might need them. */ 71 ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params; 72 73 /* can we TX with MCS rates? */ 74 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 75 return; 76 77 /* Counting from 0, therefore +1 */ 78 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 79 max_tx_streams = 80 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 81 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 82 else 83 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 84 85 /* 86 * 802.11n-2009 20.3.5 / 20.6 says: 87 * - indices 0 to 7 and 32 are single spatial stream 88 * - 8 to 31 are multiple spatial streams using equal modulation 89 * [8..15 for two streams, 16..23 for three and 24..31 for four] 90 * - remainder are multiple spatial streams using unequal modulation 91 */ 92 for (i = 0; i < max_tx_streams; i++) 93 ht_cap->mcs.rx_mask[i] = 94 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 95 96 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 97 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 98 i < IEEE80211_HT_MCS_MASK_LEN; i++) 99 ht_cap->mcs.rx_mask[i] = 100 sband->ht_cap.mcs.rx_mask[i] & 101 ht_cap_ie->mcs.rx_mask[i]; 102 103 /* handle MCS rate 32 too */ 104 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 105 ht_cap->mcs.rx_mask[32/8] |= 1; 106 } 107 108 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) 109 { 110 int i; 111 112 cancel_work_sync(&sta->ampdu_mlme.work); 113 114 for (i = 0; i < STA_TID_NUM; i++) { 115 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx); 116 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 117 WLAN_REASON_QSTA_LEAVE_QBSS, tx); 118 } 119 } 120 121 void ieee80211_ba_session_work(struct work_struct *work) 122 { 123 struct sta_info *sta = 124 container_of(work, struct sta_info, ampdu_mlme.work); 125 struct tid_ampdu_tx *tid_tx; 126 int tid; 127 128 /* 129 * When this flag is set, new sessions should be 130 * blocked, and existing sessions will be torn 131 * down by the code that set the flag, so this 132 * need not run. 133 */ 134 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) 135 return; 136 137 mutex_lock(&sta->ampdu_mlme.mtx); 138 for (tid = 0; tid < STA_TID_NUM; tid++) { 139 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 140 ___ieee80211_stop_rx_ba_session( 141 sta, tid, WLAN_BACK_RECIPIENT, 142 WLAN_REASON_QSTA_TIMEOUT, true); 143 144 if (test_and_clear_bit(tid, 145 sta->ampdu_mlme.tid_rx_stop_requested)) 146 ___ieee80211_stop_rx_ba_session( 147 sta, tid, WLAN_BACK_RECIPIENT, 148 WLAN_REASON_UNSPECIFIED, true); 149 150 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 151 if (tid_tx) { 152 /* 153 * Assign it over to the normal tid_tx array 154 * where it "goes live". 155 */ 156 spin_lock_bh(&sta->lock); 157 158 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 159 /* could there be a race? */ 160 if (sta->ampdu_mlme.tid_tx[tid]) 161 kfree(tid_tx); 162 else 163 ieee80211_assign_tid_tx(sta, tid, tid_tx); 164 spin_unlock_bh(&sta->lock); 165 166 ieee80211_tx_ba_session_handle_start(sta, tid); 167 continue; 168 } 169 170 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 171 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, 172 &tid_tx->state)) 173 ___ieee80211_stop_tx_ba_session(sta, tid, 174 WLAN_BACK_INITIATOR, 175 true); 176 } 177 mutex_unlock(&sta->ampdu_mlme.mtx); 178 } 179 180 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 181 const u8 *da, u16 tid, 182 u16 initiator, u16 reason_code) 183 { 184 struct ieee80211_local *local = sdata->local; 185 struct sk_buff *skb; 186 struct ieee80211_mgmt *mgmt; 187 u16 params; 188 189 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 190 if (!skb) 191 return; 192 193 skb_reserve(skb, local->hw.extra_tx_headroom); 194 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 195 memset(mgmt, 0, 24); 196 memcpy(mgmt->da, da, ETH_ALEN); 197 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 198 if (sdata->vif.type == NL80211_IFTYPE_AP || 199 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) 200 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 201 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 202 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 203 204 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 205 IEEE80211_STYPE_ACTION); 206 207 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 208 209 mgmt->u.action.category = WLAN_CATEGORY_BACK; 210 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 211 params = (u16)(initiator << 11); /* bit 11 initiator */ 212 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 213 214 mgmt->u.action.u.delba.params = cpu_to_le16(params); 215 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 216 217 ieee80211_tx_skb(sdata, skb); 218 } 219 220 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 221 struct sta_info *sta, 222 struct ieee80211_mgmt *mgmt, size_t len) 223 { 224 u16 tid, params; 225 u16 initiator; 226 227 params = le16_to_cpu(mgmt->u.action.u.delba.params); 228 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 229 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 230 231 #ifdef CONFIG_MAC80211_HT_DEBUG 232 if (net_ratelimit()) 233 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", 234 mgmt->sa, initiator ? "initiator" : "recipient", tid, 235 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 236 #endif /* CONFIG_MAC80211_HT_DEBUG */ 237 238 if (initiator == WLAN_BACK_INITIATOR) 239 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 240 true); 241 else 242 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 243 true); 244 } 245 246 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 247 enum ieee80211_smps_mode smps, const u8 *da, 248 const u8 *bssid) 249 { 250 struct ieee80211_local *local = sdata->local; 251 struct sk_buff *skb; 252 struct ieee80211_mgmt *action_frame; 253 254 /* 27 = header + category + action + smps mode */ 255 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 256 if (!skb) 257 return -ENOMEM; 258 259 skb_reserve(skb, local->hw.extra_tx_headroom); 260 action_frame = (void *)skb_put(skb, 27); 261 memcpy(action_frame->da, da, ETH_ALEN); 262 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 263 memcpy(action_frame->bssid, bssid, ETH_ALEN); 264 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 265 IEEE80211_STYPE_ACTION); 266 action_frame->u.action.category = WLAN_CATEGORY_HT; 267 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 268 switch (smps) { 269 case IEEE80211_SMPS_AUTOMATIC: 270 case IEEE80211_SMPS_NUM_MODES: 271 WARN_ON(1); 272 case IEEE80211_SMPS_OFF: 273 action_frame->u.action.u.ht_smps.smps_control = 274 WLAN_HT_SMPS_CONTROL_DISABLED; 275 break; 276 case IEEE80211_SMPS_STATIC: 277 action_frame->u.action.u.ht_smps.smps_control = 278 WLAN_HT_SMPS_CONTROL_STATIC; 279 break; 280 case IEEE80211_SMPS_DYNAMIC: 281 action_frame->u.action.u.ht_smps.smps_control = 282 WLAN_HT_SMPS_CONTROL_DYNAMIC; 283 break; 284 } 285 286 /* we'll do more on status of this frame */ 287 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 288 ieee80211_tx_skb(sdata, skb); 289 290 return 0; 291 } 292 293 void ieee80211_request_smps_work(struct work_struct *work) 294 { 295 struct ieee80211_sub_if_data *sdata = 296 container_of(work, struct ieee80211_sub_if_data, 297 u.mgd.request_smps_work); 298 299 mutex_lock(&sdata->u.mgd.mtx); 300 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); 301 mutex_unlock(&sdata->u.mgd.mtx); 302 } 303 304 void ieee80211_request_smps(struct ieee80211_vif *vif, 305 enum ieee80211_smps_mode smps_mode) 306 { 307 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 308 309 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 310 return; 311 312 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) 313 smps_mode = IEEE80211_SMPS_AUTOMATIC; 314 315 sdata->u.mgd.driver_smps_mode = smps_mode; 316 317 ieee80211_queue_work(&sdata->local->hw, 318 &sdata->u.mgd.request_smps_work); 319 } 320 /* this might change ... don't want non-open drivers using it */ 321 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 322