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 static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata, 23 struct ieee80211_sta_ht_cap *ht_cap, 24 u16 flag) 25 { 26 __le16 le_flag = cpu_to_le16(flag); 27 if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) { 28 if (!(sdata->u.mgd.ht_capa.cap_info & le_flag)) 29 ht_cap->cap &= ~flag; 30 } 31 } 32 33 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, 34 struct ieee80211_sta_ht_cap *ht_cap) 35 { 36 u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask); 37 u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask); 38 int i; 39 40 if (sdata->vif.type != NL80211_IFTYPE_STATION) { 41 /* AP interfaces call this code when adding new stations, 42 * so just silently ignore non station interfaces. 43 */ 44 return; 45 } 46 47 /* NOTE: If you add more over-rides here, update register_hw 48 * ht_capa_mod_msk logic in main.c as well. 49 * And, if this method can ever change ht_cap.ht_supported, fix 50 * the check in ieee80211_add_ht_ie. 51 */ 52 53 /* check for HT over-rides, MCS rates first. */ 54 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 55 u8 m = smask[i]; 56 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ 57 /* Add back rates that are supported */ 58 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); 59 } 60 61 /* Force removal of HT-40 capabilities? */ 62 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); 63 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40); 64 65 /* Allow user to disable the max-AMSDU bit. */ 66 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); 67 68 /* Allow user to decrease AMPDU factor */ 69 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & 70 IEEE80211_HT_AMPDU_PARM_FACTOR) { 71 u8 n = sdata->u.mgd.ht_capa.ampdu_params_info 72 & IEEE80211_HT_AMPDU_PARM_FACTOR; 73 if (n < ht_cap->ampdu_factor) 74 ht_cap->ampdu_factor = n; 75 } 76 77 /* Allow the user to increase AMPDU density. */ 78 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & 79 IEEE80211_HT_AMPDU_PARM_DENSITY) { 80 u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info & 81 IEEE80211_HT_AMPDU_PARM_DENSITY) 82 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 83 if (n > ht_cap->ampdu_density) 84 ht_cap->ampdu_density = n; 85 } 86 } 87 88 89 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 90 struct ieee80211_supported_band *sband, 91 struct ieee80211_ht_cap *ht_cap_ie, 92 struct ieee80211_sta_ht_cap *ht_cap) 93 { 94 u8 ampdu_info, tx_mcs_set_cap; 95 int i, max_tx_streams; 96 97 BUG_ON(!ht_cap); 98 99 memset(ht_cap, 0, sizeof(*ht_cap)); 100 101 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 102 return; 103 104 ht_cap->ht_supported = true; 105 106 /* 107 * The bits listed in this expression should be 108 * the same for the peer and us, if the station 109 * advertises more then we can't use those thus 110 * we mask them out. 111 */ 112 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & 113 (sband->ht_cap.cap | 114 ~(IEEE80211_HT_CAP_LDPC_CODING | 115 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 116 IEEE80211_HT_CAP_GRN_FLD | 117 IEEE80211_HT_CAP_SGI_20 | 118 IEEE80211_HT_CAP_SGI_40 | 119 IEEE80211_HT_CAP_DSSSCCK40)); 120 /* 121 * The STBC bits are asymmetric -- if we don't have 122 * TX then mask out the peer's RX and vice versa. 123 */ 124 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 125 ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; 126 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 127 ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC; 128 129 ampdu_info = ht_cap_ie->ampdu_params_info; 130 ht_cap->ampdu_factor = 131 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 132 ht_cap->ampdu_density = 133 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 134 135 /* own MCS TX capabilities */ 136 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; 137 138 /* Copy peer MCS TX capabilities, the driver might need them. */ 139 ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params; 140 141 /* can we TX with MCS rates? */ 142 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 143 return; 144 145 /* Counting from 0, therefore +1 */ 146 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 147 max_tx_streams = 148 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 149 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 150 else 151 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 152 153 /* 154 * 802.11n-2009 20.3.5 / 20.6 says: 155 * - indices 0 to 7 and 32 are single spatial stream 156 * - 8 to 31 are multiple spatial streams using equal modulation 157 * [8..15 for two streams, 16..23 for three and 24..31 for four] 158 * - remainder are multiple spatial streams using unequal modulation 159 */ 160 for (i = 0; i < max_tx_streams; i++) 161 ht_cap->mcs.rx_mask[i] = 162 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 163 164 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 165 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 166 i < IEEE80211_HT_MCS_MASK_LEN; i++) 167 ht_cap->mcs.rx_mask[i] = 168 sband->ht_cap.mcs.rx_mask[i] & 169 ht_cap_ie->mcs.rx_mask[i]; 170 171 /* handle MCS rate 32 too */ 172 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 173 ht_cap->mcs.rx_mask[32/8] |= 1; 174 175 /* 176 * If user has specified capability over-rides, take care 177 * of that here. 178 */ 179 ieee80211_apply_htcap_overrides(sdata, ht_cap); 180 } 181 182 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) 183 { 184 int i; 185 186 cancel_work_sync(&sta->ampdu_mlme.work); 187 188 for (i = 0; i < IEEE80211_NUM_TIDS; i++) { 189 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx); 190 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 191 WLAN_REASON_QSTA_LEAVE_QBSS, tx); 192 } 193 } 194 195 void ieee80211_ba_session_work(struct work_struct *work) 196 { 197 struct sta_info *sta = 198 container_of(work, struct sta_info, ampdu_mlme.work); 199 struct tid_ampdu_tx *tid_tx; 200 int tid; 201 202 /* 203 * When this flag is set, new sessions should be 204 * blocked, and existing sessions will be torn 205 * down by the code that set the flag, so this 206 * need not run. 207 */ 208 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) 209 return; 210 211 mutex_lock(&sta->ampdu_mlme.mtx); 212 for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { 213 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 214 ___ieee80211_stop_rx_ba_session( 215 sta, tid, WLAN_BACK_RECIPIENT, 216 WLAN_REASON_QSTA_TIMEOUT, true); 217 218 if (test_and_clear_bit(tid, 219 sta->ampdu_mlme.tid_rx_stop_requested)) 220 ___ieee80211_stop_rx_ba_session( 221 sta, tid, WLAN_BACK_RECIPIENT, 222 WLAN_REASON_UNSPECIFIED, true); 223 224 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 225 if (tid_tx) { 226 /* 227 * Assign it over to the normal tid_tx array 228 * where it "goes live". 229 */ 230 spin_lock_bh(&sta->lock); 231 232 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 233 /* could there be a race? */ 234 if (sta->ampdu_mlme.tid_tx[tid]) 235 kfree(tid_tx); 236 else 237 ieee80211_assign_tid_tx(sta, tid, tid_tx); 238 spin_unlock_bh(&sta->lock); 239 240 ieee80211_tx_ba_session_handle_start(sta, tid); 241 continue; 242 } 243 244 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 245 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, 246 &tid_tx->state)) 247 ___ieee80211_stop_tx_ba_session(sta, tid, 248 WLAN_BACK_INITIATOR, 249 true); 250 } 251 mutex_unlock(&sta->ampdu_mlme.mtx); 252 } 253 254 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 255 const u8 *da, u16 tid, 256 u16 initiator, u16 reason_code) 257 { 258 struct ieee80211_local *local = sdata->local; 259 struct sk_buff *skb; 260 struct ieee80211_mgmt *mgmt; 261 u16 params; 262 263 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 264 if (!skb) 265 return; 266 267 skb_reserve(skb, local->hw.extra_tx_headroom); 268 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 269 memset(mgmt, 0, 24); 270 memcpy(mgmt->da, da, ETH_ALEN); 271 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 272 if (sdata->vif.type == NL80211_IFTYPE_AP || 273 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 274 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 275 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 276 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 277 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 278 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 279 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 280 281 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 282 IEEE80211_STYPE_ACTION); 283 284 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 285 286 mgmt->u.action.category = WLAN_CATEGORY_BACK; 287 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 288 params = (u16)(initiator << 11); /* bit 11 initiator */ 289 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 290 291 mgmt->u.action.u.delba.params = cpu_to_le16(params); 292 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 293 294 ieee80211_tx_skb_tid(sdata, skb, tid); 295 } 296 297 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 298 struct sta_info *sta, 299 struct ieee80211_mgmt *mgmt, size_t len) 300 { 301 u16 tid, params; 302 u16 initiator; 303 304 params = le16_to_cpu(mgmt->u.action.u.delba.params); 305 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 306 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 307 308 ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", 309 mgmt->sa, initiator ? "initiator" : "recipient", 310 tid, 311 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 312 313 if (initiator == WLAN_BACK_INITIATOR) 314 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 315 true); 316 else 317 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 318 true); 319 } 320 321 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 322 enum ieee80211_smps_mode smps, const u8 *da, 323 const u8 *bssid) 324 { 325 struct ieee80211_local *local = sdata->local; 326 struct sk_buff *skb; 327 struct ieee80211_mgmt *action_frame; 328 329 /* 27 = header + category + action + smps mode */ 330 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 331 if (!skb) 332 return -ENOMEM; 333 334 skb_reserve(skb, local->hw.extra_tx_headroom); 335 action_frame = (void *)skb_put(skb, 27); 336 memcpy(action_frame->da, da, ETH_ALEN); 337 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 338 memcpy(action_frame->bssid, bssid, ETH_ALEN); 339 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 340 IEEE80211_STYPE_ACTION); 341 action_frame->u.action.category = WLAN_CATEGORY_HT; 342 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 343 switch (smps) { 344 case IEEE80211_SMPS_AUTOMATIC: 345 case IEEE80211_SMPS_NUM_MODES: 346 WARN_ON(1); 347 case IEEE80211_SMPS_OFF: 348 action_frame->u.action.u.ht_smps.smps_control = 349 WLAN_HT_SMPS_CONTROL_DISABLED; 350 break; 351 case IEEE80211_SMPS_STATIC: 352 action_frame->u.action.u.ht_smps.smps_control = 353 WLAN_HT_SMPS_CONTROL_STATIC; 354 break; 355 case IEEE80211_SMPS_DYNAMIC: 356 action_frame->u.action.u.ht_smps.smps_control = 357 WLAN_HT_SMPS_CONTROL_DYNAMIC; 358 break; 359 } 360 361 /* we'll do more on status of this frame */ 362 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 363 ieee80211_tx_skb(sdata, skb); 364 365 return 0; 366 } 367 368 void ieee80211_request_smps_work(struct work_struct *work) 369 { 370 struct ieee80211_sub_if_data *sdata = 371 container_of(work, struct ieee80211_sub_if_data, 372 u.mgd.request_smps_work); 373 374 mutex_lock(&sdata->u.mgd.mtx); 375 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); 376 mutex_unlock(&sdata->u.mgd.mtx); 377 } 378 379 void ieee80211_request_smps(struct ieee80211_vif *vif, 380 enum ieee80211_smps_mode smps_mode) 381 { 382 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 383 384 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 385 return; 386 387 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) 388 smps_mode = IEEE80211_SMPS_AUTOMATIC; 389 390 sdata->u.mgd.driver_smps_mode = smps_mode; 391 392 ieee80211_queue_work(&sdata->local->hw, 393 &sdata->u.mgd.request_smps_work); 394 } 395 /* this might change ... don't want non-open drivers using it */ 396 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 397