| /* |
| * 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" |
| |
| bool ieee80111_cfg_override_disables_ht40(struct ieee80211_sub_if_data *sdata) |
| { |
| const __le16 flg = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40); |
| if ((sdata->u.mgd.ht_capa_mask.cap_info & flg) && |
| !(sdata->u.mgd.ht_capa.cap_info & flg)) |
| return true; |
| return false; |
| } |
| |
| static void __check_htcap_disable(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_sta_ht_cap *ht_cap, |
| u16 flag) |
| { |
| __le16 le_flag = cpu_to_le16(flag); |
| if (sdata->u.mgd.ht_capa_mask.cap_info & le_flag) { |
| if (!(sdata->u.mgd.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) |
| { |
| u8 *scaps = (u8 *)(&sdata->u.mgd.ht_capa.mcs.rx_mask); |
| u8 *smask = (u8 *)(&sdata->u.mgd.ht_capa_mask.mcs.rx_mask); |
| int i; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) { |
| WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION); |
| return; |
| } |
| |
| /* NOTE: If you add more over-rides here, update register_hw |
| * ht_capa_mod_msk 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(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40); |
| __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40); |
| |
| /* Allow user to disable the max-AMSDU bit. */ |
| __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU); |
| |
| /* Allow user to decrease AMPDU factor */ |
| if (sdata->u.mgd.ht_capa_mask.ampdu_params_info & |
| IEEE80211_HT_AMPDU_PARM_FACTOR) { |
| u8 n = sdata->u.mgd.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 (sdata->u.mgd.ht_capa_mask.ampdu_params_info & |
| IEEE80211_HT_AMPDU_PARM_DENSITY) { |
| u8 n = (sdata->u.mgd.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; |
| } |
| } |
| |
| |
| void ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_supported_band *sband, |
| struct ieee80211_ht_cap *ht_cap_ie, |
| struct ieee80211_sta_ht_cap *ht_cap) |
| { |
| u8 ampdu_info, tx_mcs_set_cap; |
| int i, max_tx_streams; |
| |
| BUG_ON(!ht_cap); |
| |
| memset(ht_cap, 0, sizeof(*ht_cap)); |
| |
| if (!ht_cap_ie || !sband->ht_cap.ht_supported) |
| return; |
| |
| ht_cap->ht_supported = true; |
| |
| /* |
| * 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) & |
| (sband->ht_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 (!(sband->ht_cap.cap & IEEE80211_HT_CAP_TX_STBC)) |
| ht_cap->cap &= ~IEEE80211_HT_CAP_RX_STBC; |
| if (!(sband->ht_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 = sband->ht_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)) |
| return; |
| |
| /* 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] = |
| sband->ht_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] = |
| sband->ht_cap.mcs.rx_mask[i] & |
| ht_cap_ie->mcs.rx_mask[i]; |
| |
| /* handle MCS rate 32 too */ |
| if (sband->ht_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1) |
| ht_cap->mcs.rx_mask[32/8] |= 1; |
| |
| /* |
| * If user has specified capability over-rides, take care |
| * of that here. |
| */ |
| ieee80211_apply_htcap_overrides(sdata, ht_cap); |
| } |
| |
| void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta, bool tx) |
| { |
| int i; |
| |
| cancel_work_sync(&sta->ampdu_mlme.work); |
| |
| for (i = 0; i < STA_TID_NUM; i++) { |
| __ieee80211_stop_tx_ba_session(sta, i, WLAN_BACK_INITIATOR, tx); |
| __ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT, |
| WLAN_REASON_QSTA_LEAVE_QBSS, tx); |
| } |
| } |
| |
| 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 < STA_TID_NUM; 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); |
| |
| 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". |
| */ |
| spin_lock_bh(&sta->lock); |
| |
| 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; |
| } |
| |
| 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, |
| WLAN_BACK_INITIATOR, |
| true); |
| } |
| 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; |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "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)); |
| #endif /* CONFIG_MAC80211_HT_DEBUG */ |
| |
| 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, WLAN_BACK_RECIPIENT, |
| true); |
| } |
| |
| 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_work(struct work_struct *work) |
| { |
| struct ieee80211_sub_if_data *sdata = |
| container_of(work, struct ieee80211_sub_if_data, |
| u.mgd.request_smps_work); |
| |
| mutex_lock(&sdata->u.mgd.mtx); |
| __ieee80211_request_smps(sdata, sdata->u.mgd.driver_smps_mode); |
| mutex_unlock(&sdata->u.mgd.mtx); |
| } |
| |
| 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(vif->type != NL80211_IFTYPE_STATION)) |
| return; |
| |
| if (WARN_ON(smps_mode == IEEE80211_SMPS_OFF)) |
| smps_mode = IEEE80211_SMPS_AUTOMATIC; |
| |
| sdata->u.mgd.driver_smps_mode = smps_mode; |
| |
| ieee80211_queue_work(&sdata->local->hw, |
| &sdata->u.mgd.request_smps_work); |
| } |
| /* this might change ... don't want non-open drivers using it */ |
| EXPORT_SYMBOL_GPL(ieee80211_request_smps); |