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 bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata) 23 { 24 const __le16 flg = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40); 25 if ((sdata->u.mgd.ht_capa_mask.cap_info & flg) && 26 !(sdata->u.mgd.ht_capa.cap_info & flg)) 27 return true; 28 return false; 29 } 30 31 static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata, 32 struct ieee80211_sta_ht_cap *ht_cap, 33 u16 flag) 34 { 35 __le16 le_flag = cpu_to_le16(flag); 36 if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) { 37 if (!(sdata->u.mgd.ht_capa.cap_info & le_flag)) 38 ht_cap->cap &= ~flag; 39 } 40 } 41 42 void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, 43 struct ieee80211_sta_ht_cap *ht_cap) 44 { 45 u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask); 46 u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask); 47 int i; 48 49 if (sdata->vif.type != NL80211_IFTYPE_STATION) { 50 /* AP interfaces call this code when adding new stations, 51 * so just silently ignore non station interfaces. 52 */ 53 return; 54 } 55 56 /* NOTE: If you add more over-rides here, update register_hw 57 * ht_capa_mod_msk logic in main.c as well. 58 * And, if this method can ever change ht_cap.ht_supported, fix 59 * the check in ieee80211_add_ht_ie. 60 */ 61 62 /* check for HT over-rides, MCS rates first. */ 63 for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { 64 u8 m = smask[i]; 65 ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ 66 /* Add back rates that are supported */ 67 ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); 68 } 69 70 /* Force removal of HT-40 capabilities? */ 71 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); 72 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40); 73 74 /* Allow user to disable the max-AMSDU bit. */ 75 __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); 76 77 /* Allow user to decrease AMPDU factor */ 78 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & 79 IEEE80211_HT_AMPDU_PARM_FACTOR) { 80 u8 n = sdata->u.mgd.ht_capa.ampdu_params_info 81 & IEEE80211_HT_AMPDU_PARM_FACTOR; 82 if (n < ht_cap->ampdu_factor) 83 ht_cap->ampdu_factor = n; 84 } 85 86 /* Allow the user to increase AMPDU density. */ 87 if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & 88 IEEE80211_HT_AMPDU_PARM_DENSITY) { 89 u8 n = (sdata->u.mgd.ht_capa.ampdu_params_info & 90 IEEE80211_HT_AMPDU_PARM_DENSITY) 91 >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; 92 if (n > ht_cap->ampdu_density) 93 ht_cap->ampdu_density = n; 94 } 95 } 96 97 98 void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, 99 struct ieee80211_supported_band *sband, 100 struct ieee80211_ht_cap *ht_cap_ie, 101 struct ieee80211_sta_ht_cap *ht_cap) 102 { 103 u8 ampdu_info, tx_mcs_set_cap; 104 int i, max_tx_streams; 105 106 BUG_ON(!ht_cap); 107 108 memset(ht_cap, 0, sizeof(*ht_cap)); 109 110 if (!ht_cap_ie || !sband->ht_cap.ht_supported) 111 return; 112 113 ht_cap->ht_supported = true; 114 115 /* 116 * The bits listed in this expression should be 117 * the same for the peer and us, if the station 118 * advertises more then we can't use those thus 119 * we mask them out. 120 */ 121 ht_cap->cap = le16_to_cpu(ht_cap_ie->cap_info) & 122 (sband->ht_cap.cap | 123 ~(IEEE80211_HT_CAP_LDPC_CODING | 124 IEEE80211_HT_CAP_SUP_WIDTH_20_40 | 125 IEEE80211_HT_CAP_GRN_FLD | 126 IEEE80211_HT_CAP_SGI_20 | 127 IEEE80211_HT_CAP_SGI_40 | 128 IEEE80211_HT_CAP_DSSSCCK40)); 129 /* 130 * The STBC bits are asymmetric -- if we don't have 131 * TX then mask out the peer's RX and vice versa. 132 */ 133 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) 134 ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; 135 if (!(sband->ht_cap.cap & IEEE80211_HT_CAP_RX_STBC)) 136 ht_cap->cap &= ~IEEE80211_HT_CAP_TX_STBC; 137 138 ampdu_info = ht_cap_ie->ampdu_params_info; 139 ht_cap->ampdu_factor = 140 ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; 141 ht_cap->ampdu_density = 142 (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; 143 144 /* own MCS TX capabilities */ 145 tx_mcs_set_cap = sband->ht_cap.mcs.tx_params; 146 147 /* Copy peer MCS TX capabilities, the driver might need them. */ 148 ht_cap->mcs.tx_params = ht_cap_ie->mcs.tx_params; 149 150 /* can we TX with MCS rates? */ 151 if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) 152 return; 153 154 /* Counting from 0, therefore +1 */ 155 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) 156 max_tx_streams = 157 ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) 158 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; 159 else 160 max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; 161 162 /* 163 * 802.11n-2009 20.3.5 / 20.6 says: 164 * - indices 0 to 7 and 32 are single spatial stream 165 * - 8 to 31 are multiple spatial streams using equal modulation 166 * [8..15 for two streams, 16..23 for three and 24..31 for four] 167 * - remainder are multiple spatial streams using unequal modulation 168 */ 169 for (i = 0; i < max_tx_streams; i++) 170 ht_cap->mcs.rx_mask[i] = 171 sband->ht_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; 172 173 if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) 174 for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; 175 i < IEEE80211_HT_MCS_MASK_LEN; i++) 176 ht_cap->mcs.rx_mask[i] = 177 sband->ht_cap.mcs.rx_mask[i] & 178 ht_cap_ie->mcs.rx_mask[i]; 179 180 /* handle MCS rate 32 too */ 181 if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) 182 ht_cap->mcs.rx_mask[32/8] |= 1; 183 184 /* 185 * If user has specified capability over-rides, take care 186 * of that here. 187 */ 188 ieee80211_apply_htcap_overrides(sdata, ht_cap); 189 } 190 191 void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) 192 { 193 int i; 194 195 cancel_work_sync(&sta->ampdu_mlme.work); 196 197 for (i = 0; i < STA_TID_NUM; i++) { 198 __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx); 199 __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, 200 WLAN_REASON_QSTA_LEAVE_QBSS, tx); 201 } 202 } 203 204 void ieee80211_ba_session_work(struct work_struct *work) 205 { 206 struct sta_info *sta = 207 container_of(work, struct sta_info, ampdu_mlme.work); 208 struct tid_ampdu_tx *tid_tx; 209 int tid; 210 211 /* 212 * When this flag is set, new sessions should be 213 * blocked, and existing sessions will be torn 214 * down by the code that set the flag, so this 215 * need not run. 216 */ 217 if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) 218 return; 219 220 mutex_lock(&sta->ampdu_mlme.mtx); 221 for (tid = 0; tid < STA_TID_NUM; tid++) { 222 if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) 223 ___ieee80211_stop_rx_ba_session( 224 sta, tid, WLAN_BACK_RECIPIENT, 225 WLAN_REASON_QSTA_TIMEOUT, true); 226 227 if (test_and_clear_bit(tid, 228 sta->ampdu_mlme.tid_rx_stop_requested)) 229 ___ieee80211_stop_rx_ba_session( 230 sta, tid, WLAN_BACK_RECIPIENT, 231 WLAN_REASON_UNSPECIFIED, true); 232 233 tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; 234 if (tid_tx) { 235 /* 236 * Assign it over to the normal tid_tx array 237 * where it "goes live". 238 */ 239 spin_lock_bh(&sta->lock); 240 241 sta->ampdu_mlme.tid_start_tx[tid] = NULL; 242 /* could there be a race? */ 243 if (sta->ampdu_mlme.tid_tx[tid]) 244 kfree(tid_tx); 245 else 246 ieee80211_assign_tid_tx(sta, tid, tid_tx); 247 spin_unlock_bh(&sta->lock); 248 249 ieee80211_tx_ba_session_handle_start(sta, tid); 250 continue; 251 } 252 253 tid_tx = rcu_dereference_protected_tid_tx(sta, tid); 254 if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, 255 &tid_tx->state)) 256 ___ieee80211_stop_tx_ba_session(sta, tid, 257 WLAN_BACK_INITIATOR, 258 true); 259 } 260 mutex_unlock(&sta->ampdu_mlme.mtx); 261 } 262 263 void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, 264 const u8 *da, u16 tid, 265 u16 initiator, u16 reason_code) 266 { 267 struct ieee80211_local *local = sdata->local; 268 struct sk_buff *skb; 269 struct ieee80211_mgmt *mgmt; 270 u16 params; 271 272 skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); 273 if (!skb) 274 return; 275 276 skb_reserve(skb, local->hw.extra_tx_headroom); 277 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); 278 memset(mgmt, 0, 24); 279 memcpy(mgmt->da, da, ETH_ALEN); 280 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); 281 if (sdata->vif.type == NL80211_IFTYPE_AP || 282 sdata->vif.type == NL80211_IFTYPE_AP_VLAN || 283 sdata->vif.type == NL80211_IFTYPE_MESH_POINT) 284 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); 285 else if (sdata->vif.type == NL80211_IFTYPE_STATION) 286 memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); 287 else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) 288 memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); 289 290 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 291 IEEE80211_STYPE_ACTION); 292 293 skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); 294 295 mgmt->u.action.category = WLAN_CATEGORY_BACK; 296 mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; 297 params = (u16)(initiator << 11); /* bit 11 initiator */ 298 params |= (u16)(tid << 12); /* bit 15:12 TID number */ 299 300 mgmt->u.action.u.delba.params = cpu_to_le16(params); 301 mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); 302 303 ieee80211_tx_skb_tid(sdata, skb, tid); 304 } 305 306 void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, 307 struct sta_info *sta, 308 struct ieee80211_mgmt *mgmt, size_t len) 309 { 310 u16 tid, params; 311 u16 initiator; 312 313 params = le16_to_cpu(mgmt->u.action.u.delba.params); 314 tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; 315 initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; 316 317 #ifdef CONFIG_MAC80211_HT_DEBUG 318 if (net_ratelimit()) 319 printk(KERN_DEBUG "delba from %pM (%s) tid %d reason code %d\n", 320 mgmt->sa, initiator ? "initiator" : "recipient", tid, 321 le16_to_cpu(mgmt->u.action.u.delba.reason_code)); 322 #endif /* CONFIG_MAC80211_HT_DEBUG */ 323 324 if (initiator == WLAN_BACK_INITIATOR) 325 __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, 326 true); 327 else 328 __ieee80211_stop_tx_ba_session(sta, tid, WLAN_BACK_RECIPIENT, 329 true); 330 } 331 332 int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, 333 enum ieee80211_smps_mode smps, const u8 *da, 334 const u8 *bssid) 335 { 336 struct ieee80211_local *local = sdata->local; 337 struct sk_buff *skb; 338 struct ieee80211_mgmt *action_frame; 339 340 /* 27 = header + category + action + smps mode */ 341 skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); 342 if (!skb) 343 return -ENOMEM; 344 345 skb_reserve(skb, local->hw.extra_tx_headroom); 346 action_frame = (void *)skb_put(skb, 27); 347 memcpy(action_frame->da, da, ETH_ALEN); 348 memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); 349 memcpy(action_frame->bssid, bssid, ETH_ALEN); 350 action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | 351 IEEE80211_STYPE_ACTION); 352 action_frame->u.action.category = WLAN_CATEGORY_HT; 353 action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; 354 switch (smps) { 355 case IEEE80211_SMPS_AUTOMATIC: 356 case IEEE80211_SMPS_NUM_MODES: 357 WARN_ON(1); 358 case IEEE80211_SMPS_OFF: 359 action_frame->u.action.u.ht_smps.smps_control = 360 WLAN_HT_SMPS_CONTROL_DISABLED; 361 break; 362 case IEEE80211_SMPS_STATIC: 363 action_frame->u.action.u.ht_smps.smps_control = 364 WLAN_HT_SMPS_CONTROL_STATIC; 365 break; 366 case IEEE80211_SMPS_DYNAMIC: 367 action_frame->u.action.u.ht_smps.smps_control = 368 WLAN_HT_SMPS_CONTROL_DYNAMIC; 369 break; 370 } 371 372 /* we'll do more on status of this frame */ 373 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; 374 ieee80211_tx_skb(sdata, skb); 375 376 return 0; 377 } 378 379 void ieee80211_request_smps_work(struct work_struct *work) 380 { 381 struct ieee80211_sub_if_data *sdata = 382 container_of(work, struct ieee80211_sub_if_data, 383 u.mgd.request_smps_work); 384 385 mutex_lock(&sdata->u.mgd.mtx); 386 __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); 387 mutex_unlock(&sdata->u.mgd.mtx); 388 } 389 390 void ieee80211_request_smps(struct ieee80211_vif *vif, 391 enum ieee80211_smps_mode smps_mode) 392 { 393 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); 394 395 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) 396 return; 397 398 if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) 399 smps_mode = IEEE80211_SMPS_AUTOMATIC; 400 401 sdata->u.mgd.driver_smps_mode = smps_mode; 402 403 ieee80211_queue_work(&sdata->local->hw, 404 &sdata->u.mgd.request_smps_work); 405 } 406 /* this might change ... don't want non-open drivers using it */ 407 EXPORT_SYMBOL_GPL(ieee80211_request_smps); 408