/* * HT handling * * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi> * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> * Copyright 2007, Michael Wu <flamingice@sourmilk.net> * Copyright 2007-2010, Intel Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/ieee80211.h> #include <linux/export.h> #include <net/mac80211.h> #include "ieee80211_i.h" #include "rate.h" static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa, struct ieee80211_ht_cap *ht_capa_mask, struct ieee80211_sta_ht_cap *ht_cap, u16 flag) { __le16 le_flag = cpu_to_le16(flag); if (ht_capa_mask->cap_info & le_flag) { if (!(ht_capa->cap_info & le_flag)) ht_cap->cap &= ~flag; } } static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa, struct ieee80211_ht_cap *ht_capa_mask, struct ieee80211_sta_ht_cap *ht_cap, u16 flag) { __le16 le_flag = cpu_to_le16(flag); if ((ht_capa_mask->cap_info & le_flag) && (ht_capa->cap_info & le_flag)) ht_cap->cap |= flag; } void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata, struct ieee80211_sta_ht_cap *ht_cap) { struct ieee80211_ht_cap *ht_capa, *ht_capa_mask; u8 *scaps, *smask; int i; if (!ht_cap->ht_supported) return; switch (sdata->vif.type) { case NL80211_IFTYPE_STATION: ht_capa = &sdata->u.mgd.ht_capa; ht_capa_mask = &sdata->u.mgd.ht_capa_mask; break; case NL80211_IFTYPE_ADHOC: ht_capa = &sdata->u.ibss.ht_capa; ht_capa_mask = &sdata->u.ibss.ht_capa_mask; break; default: WARN_ON_ONCE(1); return; } scaps = (u8 *)(&ht_capa->mcs.rx_mask); smask = (u8 *)(&ht_capa_mask->mcs.rx_mask); /* NOTE: If you add more over-rides here, update register_hw * ht_capa_mod_mask logic in main.c as well. * And, if this method can ever change ht_cap.ht_supported, fix * the check in ieee80211_add_ht_ie. */ /* check for HT over-rides, MCS rates first. */ for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) { u8 m = smask[i]; ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */ /* Add back rates that are supported */ ht_cap->mcs.rx_mask[i] |= (m & scaps[i]); } /* Force removal of HT-40 capabilities? */ __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, IEEE80211_HT_CAP_SGI_40); /* Allow user to disable SGI-20 (SGI-40 is handled above) */ __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, IEEE80211_HT_CAP_SGI_20); /* Allow user to disable the max-AMSDU bit. */ __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); /* Allow user to disable LDPC */ __check_htcap_disable(ht_capa, ht_capa_mask, ht_cap, IEEE80211_HT_CAP_LDPC_CODING); /* Allow user to enable 40 MHz intolerant bit. */ __check_htcap_enable(ht_capa, ht_capa_mask, ht_cap, IEEE80211_HT_CAP_40MHZ_INTOLERANT); /* Allow user to decrease AMPDU factor */ if (ht_capa_mask->ampdu_params_info & IEEE80211_HT_AMPDU_PARM_FACTOR) { u8 n = ht_capa->ampdu_params_info & IEEE80211_HT_AMPDU_PARM_FACTOR; if (n < ht_cap->ampdu_factor) ht_cap->ampdu_factor = n; } /* Allow the user to increase AMPDU density. */ if (ht_capa_mask->ampdu_params_info & IEEE80211_HT_AMPDU_PARM_DENSITY) { u8 n = (ht_capa->ampdu_params_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT; if (n > ht_cap->ampdu_density) ht_cap->ampdu_density = n; } } bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, struct ieee80211_supported_band *sband, const struct ieee80211_ht_cap *ht_cap_ie, struct sta_info *sta) { struct ieee80211_sta_ht_cap ht_cap, own_cap; u8 ampdu_info, tx_mcs_set_cap; int i, max_tx_streams; bool changed; enum ieee80211_sta_rx_bandwidth bw; enum ieee80211_smps_mode smps_mode; memset(&ht_cap, 0, sizeof(ht_cap)); if (!ht_cap_ie || !sband->ht_cap.ht_supported) goto apply; ht_cap.ht_supported = true; own_cap = sband->ht_cap; /* * If user has specified capability over-rides, take care * of that if the station we're setting up is the AP or TDLS peer that * we advertised a restricted capability set to. Override * our own capabilities and then use those below. */ if (sdata->vif.type == NL80211_IFTYPE_STATION || sdata->vif.type == NL80211_IFTYPE_ADHOC) ieee80211_apply_htcap_overrides(sdata, &own_cap); /* * The bits listed in this expression should be * the same for the peer and us, if the station * advertises more then we can't use those thus * we mask them out. */ ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) & (own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING | IEEE80211_HT_CAP_SUP_WIDTH_20_40 | IEEE80211_HT_CAP_GRN_FLD | IEEE80211_HT_CAP_SGI_20 | IEEE80211_HT_CAP_SGI_40 | IEEE80211_HT_CAP_DSSSCCK40)); /* * The STBC bits are asymmetric -- if we don't have * TX then mask out the peer's RX and vice versa. */ if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC)) ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC; if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC)) ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC; ampdu_info = ht_cap_ie->ampdu_params_info; ht_cap.ampdu_factor = ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR; ht_cap.ampdu_density = (ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2; /* own MCS TX capabilities */ tx_mcs_set_cap = own_cap.mcs.tx_params; /* Copy peer MCS TX capabilities, the driver might need them. */ ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params; /* can we TX with MCS rates? */ if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED)) goto apply; /* Counting from 0, therefore +1 */ if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF) max_tx_streams = ((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK) >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1; else max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS; /* * 802.11n-2009 20.3.5 / 20.6 says: * - indices 0 to 7 and 32 are single spatial stream * - 8 to 31 are multiple spatial streams using equal modulation * [8..15 for two streams, 16..23 for three and 24..31 for four] * - remainder are multiple spatial streams using unequal modulation */ for (i = 0; i < max_tx_streams; i++) ht_cap.mcs.rx_mask[i] = own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION) for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE; i < IEEE80211_HT_MCS_MASK_LEN; i++) ht_cap.mcs.rx_mask[i] = own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i]; /* handle MCS rate 32 too */ if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) ht_cap.mcs.rx_mask[32/8] |= 1; /* set Rx highest rate */ ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest; if (ht_cap.cap & IEEE80211_HT_CAP_MAX_AMSDU) sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_7935; else sta->sta.max_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_3839; apply: changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap)); switch (sdata->vif.bss_conf.chandef.width) { default: WARN_ON_ONCE(1); /* fall through */ case NL80211_CHAN_WIDTH_20_NOHT: case NL80211_CHAN_WIDTH_20: bw = IEEE80211_STA_RX_BW_20; break; case NL80211_CHAN_WIDTH_40: case NL80211_CHAN_WIDTH_80: case NL80211_CHAN_WIDTH_80P80: case NL80211_CHAN_WIDTH_160: bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; break; } sta->sta.bandwidth = bw; sta->cur_max_bandwidth = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ? IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20; switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> IEEE80211_HT_CAP_SM_PS_SHIFT) { case WLAN_HT_CAP_SM_PS_INVALID: case WLAN_HT_CAP_SM_PS_STATIC: smps_mode = IEEE80211_SMPS_STATIC; break; case WLAN_HT_CAP_SM_PS_DYNAMIC: smps_mode = IEEE80211_SMPS_DYNAMIC; break; case WLAN_HT_CAP_SM_PS_DISABLED: smps_mode = IEEE80211_SMPS_OFF; break; } if (smps_mode != sta->sta.smps_mode) changed = true; sta->sta.smps_mode = smps_mode; return changed; } void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, enum ieee80211_agg_stop_reason reason) { int i; cancel_work_sync(&sta->ampdu_mlme.work); for (i = 0; i < IEEE80211_NUM_TIDS; i++) { __ieee80211_stop_tx_ba_session(sta, i, reason); __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, WLAN_REASON_QSTA_LEAVE_QBSS, reason != AGG_STOP_DESTROY_STA && reason != AGG_STOP_PEER_REQUEST); } } void ieee80211_ba_session_work(struct work_struct *work) { struct sta_info *sta = container_of(work, struct sta_info, ampdu_mlme.work); struct tid_ampdu_tx *tid_tx; int tid; /* * When this flag is set, new sessions should be * blocked, and existing sessions will be torn * down by the code that set the flag, so this * need not run. */ if (test_sta_flag(sta, WLAN_STA_BLOCK_BA)) return; mutex_lock(&sta->ampdu_mlme.mtx); for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired)) ___ieee80211_stop_rx_ba_session( sta, tid, WLAN_BACK_RECIPIENT, WLAN_REASON_QSTA_TIMEOUT, true); if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_stop_requested)) ___ieee80211_stop_rx_ba_session( sta, tid, WLAN_BACK_RECIPIENT, WLAN_REASON_UNSPECIFIED, true); spin_lock_bh(&sta->lock); tid_tx = sta->ampdu_mlme.tid_start_tx[tid]; if (tid_tx) { /* * Assign it over to the normal tid_tx array * where it "goes live". */ sta->ampdu_mlme.tid_start_tx[tid] = NULL; /* could there be a race? */ if (sta->ampdu_mlme.tid_tx[tid]) kfree(tid_tx); else ieee80211_assign_tid_tx(sta, tid, tid_tx); spin_unlock_bh(&sta->lock); ieee80211_tx_ba_session_handle_start(sta, tid); continue; } spin_unlock_bh(&sta->lock); tid_tx = rcu_dereference_protected_tid_tx(sta, tid); if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP, &tid_tx->state)) ___ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_LOCAL_REQUEST); } mutex_unlock(&sta->ampdu_mlme.mtx); } void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata, const u8 *da, u16 tid, u16 initiator, u16 reason_code) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *mgmt; u16 params; skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom); if (!skb) return; skb_reserve(skb, local->hw.extra_tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24); memset(mgmt, 0, 24); memcpy(mgmt->da, da, ETH_ALEN); memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); if (sdata->vif.type == NL80211_IFTYPE_AP || sdata->vif.type == NL80211_IFTYPE_AP_VLAN || sdata->vif.type == NL80211_IFTYPE_MESH_POINT) memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); else if (sdata->vif.type == NL80211_IFTYPE_STATION) memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION); skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba)); mgmt->u.action.category = WLAN_CATEGORY_BACK; mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA; params = (u16)(initiator << 11); /* bit 11 initiator */ params |= (u16)(tid << 12); /* bit 15:12 TID number */ mgmt->u.action.u.delba.params = cpu_to_le16(params); mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code); ieee80211_tx_skb(sdata, skb); } void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata, struct sta_info *sta, struct ieee80211_mgmt *mgmt, size_t len) { u16 tid, params; u16 initiator; params = le16_to_cpu(mgmt->u.action.u.delba.params); tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12; initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11; ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n", mgmt->sa, initiator ? "initiator" : "recipient", tid, le16_to_cpu(mgmt->u.action.u.delba.reason_code)); if (initiator == WLAN_BACK_INITIATOR) __ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0, true); else __ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST); } int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata, enum ieee80211_smps_mode smps, const u8 *da, const u8 *bssid) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_mgmt *action_frame; /* 27 = header + category + action + smps mode */ skb = dev_alloc_skb(27 + local->hw.extra_tx_headroom); if (!skb) return -ENOMEM; skb_reserve(skb, local->hw.extra_tx_headroom); action_frame = (void *)skb_put(skb, 27); memcpy(action_frame->da, da, ETH_ALEN); memcpy(action_frame->sa, sdata->dev->dev_addr, ETH_ALEN); memcpy(action_frame->bssid, bssid, ETH_ALEN); action_frame->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION); action_frame->u.action.category = WLAN_CATEGORY_HT; action_frame->u.action.u.ht_smps.action = WLAN_HT_ACTION_SMPS; switch (smps) { case IEEE80211_SMPS_AUTOMATIC: case IEEE80211_SMPS_NUM_MODES: WARN_ON(1); case IEEE80211_SMPS_OFF: action_frame->u.action.u.ht_smps.smps_control = WLAN_HT_SMPS_CONTROL_DISABLED; break; case IEEE80211_SMPS_STATIC: action_frame->u.action.u.ht_smps.smps_control = WLAN_HT_SMPS_CONTROL_STATIC; break; case IEEE80211_SMPS_DYNAMIC: action_frame->u.action.u.ht_smps.smps_control = WLAN_HT_SMPS_CONTROL_DYNAMIC; break; } /* we'll do more on status of this frame */ IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; ieee80211_tx_skb(sdata, skb); return 0; } void ieee80211_request_smps_mgd_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.mgd.request_smps_work); sdata_lock(sdata); __ieee80211_request_smps_mgd(sdata, sdata->u.mgd.driver_smps_mode); sdata_unlock(sdata); } void ieee80211_request_smps_ap_work(struct work_struct *work) { struct ieee80211_sub_if_data *sdata = container_of(work, struct ieee80211_sub_if_data, u.ap.request_smps_work); sdata_lock(sdata); if (sdata_dereference(sdata->u.ap.beacon, sdata)) __ieee80211_request_smps_ap(sdata, sdata->u.ap.driver_smps_mode); sdata_unlock(sdata); } void ieee80211_request_smps(struct ieee80211_vif *vif, enum ieee80211_smps_mode smps_mode) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); if (WARN_ON_ONCE(vif->type != NL80211_IFTYPE_STATION && vif->type != NL80211_IFTYPE_AP)) return; if (vif->type == NL80211_IFTYPE_STATION) { if (sdata->u.mgd.driver_smps_mode == smps_mode) return; sdata->u.mgd.driver_smps_mode = smps_mode; ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.request_smps_work); } else { /* AUTOMATIC is meaningless in AP mode */ if (WARN_ON_ONCE(smps_mode == IEEE80211_SMPS_AUTOMATIC)) return; if (sdata->u.ap.driver_smps_mode == smps_mode) return; sdata->u.ap.driver_smps_mode = smps_mode; ieee80211_queue_work(&sdata->local->hw, &sdata->u.ap.request_smps_work); } } /* this might change ... don't want non-open drivers using it */ EXPORT_SYMBOL_GPL(ieee80211_request_smps);