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![Janusz.Dziedzic@tieto.com](/assets/img/avatar_default.png)
Add VHT support for IBSS. Drivers could activate this feature by setting NL80211_EXT_FEATURE_VHT_IBSS flag. Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
522 lines
15 KiB
C
522 lines
15 KiB
C
/*
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* HT handling
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*
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* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
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* Copyright 2002-2005, Instant802 Networks, Inc.
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* Copyright 2005-2006, Devicescape Software, Inc.
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* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
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* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
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* Copyright 2007-2010, Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/ieee80211.h>
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#include <linux/export.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "rate.h"
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static void __check_htcap_disable(struct ieee80211_ht_cap *ht_capa,
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struct ieee80211_ht_cap *ht_capa_mask,
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struct ieee80211_sta_ht_cap *ht_cap,
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u16 flag)
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{
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__le16 le_flag = cpu_to_le16(flag);
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if (ht_capa_mask->cap_info & le_flag) {
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if (!(ht_capa->cap_info & le_flag))
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ht_cap->cap &= ~flag;
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}
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}
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static void __check_htcap_enable(struct ieee80211_ht_cap *ht_capa,
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struct ieee80211_ht_cap *ht_capa_mask,
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struct ieee80211_sta_ht_cap *ht_cap,
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u16 flag)
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{
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__le16 le_flag = cpu_to_le16(flag);
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if ((ht_capa_mask->cap_info & le_flag) &&
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(ht_capa->cap_info & le_flag))
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ht_cap->cap |= flag;
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}
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void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_sta_ht_cap *ht_cap)
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{
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struct ieee80211_ht_cap *ht_capa, *ht_capa_mask;
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u8 *scaps, *smask;
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int i;
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if (!ht_cap->ht_supported)
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return;
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_STATION:
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ht_capa = &sdata->u.mgd.ht_capa;
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ht_capa_mask = &sdata->u.mgd.ht_capa_mask;
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break;
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case NL80211_IFTYPE_ADHOC:
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ht_capa = &sdata->u.ibss.ht_capa;
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ht_capa_mask = &sdata->u.ibss.ht_capa_mask;
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break;
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default:
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WARN_ON_ONCE(1);
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return;
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}
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scaps = (u8 *)(&ht_capa->mcs.rx_mask);
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smask = (u8 *)(&ht_capa_mask->mcs.rx_mask);
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/* NOTE: If you add more over-rides here, update register_hw
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* ht_capa_mod_mask logic in main.c as well.
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* And, if this method can ever change ht_cap.ht_supported, fix
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* the check in ieee80211_add_ht_ie.
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*/
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/* check for HT over-rides, MCS rates first. */
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for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++) {
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u8 m = smask[i];
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ht_cap->mcs.rx_mask[i] &= ~m; /* turn off all masked bits */
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/* Add back rates that are supported */
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ht_cap->mcs.rx_mask[i] |= (m & scaps[i]);
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}
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/* Force removal of HT-40 capabilities? */
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__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
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IEEE80211_HT_CAP_SUP_WIDTH_20_40);
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__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
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IEEE80211_HT_CAP_SGI_40);
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/* Allow user to disable SGI-20 (SGI-40 is handled above) */
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__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
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IEEE80211_HT_CAP_SGI_20);
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/* Allow user to disable the max-AMSDU bit. */
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__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
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IEEE80211_HT_CAP_MAX_AMSDU);
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/* Allow user to disable LDPC */
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__check_htcap_disable(ht_capa, ht_capa_mask, ht_cap,
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IEEE80211_HT_CAP_LDPC_CODING);
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/* Allow user to enable 40 MHz intolerant bit. */
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__check_htcap_enable(ht_capa, ht_capa_mask, ht_cap,
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IEEE80211_HT_CAP_40MHZ_INTOLERANT);
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/* Allow user to decrease AMPDU factor */
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if (ht_capa_mask->ampdu_params_info &
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IEEE80211_HT_AMPDU_PARM_FACTOR) {
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u8 n = ht_capa->ampdu_params_info &
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IEEE80211_HT_AMPDU_PARM_FACTOR;
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if (n < ht_cap->ampdu_factor)
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ht_cap->ampdu_factor = n;
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}
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/* Allow the user to increase AMPDU density. */
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if (ht_capa_mask->ampdu_params_info &
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IEEE80211_HT_AMPDU_PARM_DENSITY) {
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u8 n = (ht_capa->ampdu_params_info &
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IEEE80211_HT_AMPDU_PARM_DENSITY)
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>> IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT;
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if (n > ht_cap->ampdu_density)
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ht_cap->ampdu_density = n;
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}
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}
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bool ieee80211_ht_cap_ie_to_sta_ht_cap(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_supported_band *sband,
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const struct ieee80211_ht_cap *ht_cap_ie,
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struct sta_info *sta)
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{
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struct ieee80211_sta_ht_cap ht_cap, own_cap;
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u8 ampdu_info, tx_mcs_set_cap;
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int i, max_tx_streams;
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bool changed;
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enum ieee80211_sta_rx_bandwidth bw;
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enum ieee80211_smps_mode smps_mode;
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memset(&ht_cap, 0, sizeof(ht_cap));
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if (!ht_cap_ie || !sband->ht_cap.ht_supported)
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goto apply;
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ht_cap.ht_supported = true;
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own_cap = sband->ht_cap;
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/*
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* If user has specified capability over-rides, take care
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* of that if the station we're setting up is the AP or TDLS peer that
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* we advertised a restricted capability set to. Override
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* our own capabilities and then use those below.
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*/
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if (sdata->vif.type == NL80211_IFTYPE_STATION ||
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sdata->vif.type == NL80211_IFTYPE_ADHOC)
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ieee80211_apply_htcap_overrides(sdata, &own_cap);
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/*
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* The bits listed in this expression should be
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* the same for the peer and us, if the station
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* advertises more then we can't use those thus
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* we mask them out.
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*/
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ht_cap.cap = le16_to_cpu(ht_cap_ie->cap_info) &
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(own_cap.cap | ~(IEEE80211_HT_CAP_LDPC_CODING |
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IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
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IEEE80211_HT_CAP_GRN_FLD |
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IEEE80211_HT_CAP_SGI_20 |
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IEEE80211_HT_CAP_SGI_40 |
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IEEE80211_HT_CAP_DSSSCCK40));
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/*
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* The STBC bits are asymmetric -- if we don't have
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* TX then mask out the peer's RX and vice versa.
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*/
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if (!(own_cap.cap & IEEE80211_HT_CAP_TX_STBC))
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ht_cap.cap &= ~IEEE80211_HT_CAP_RX_STBC;
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if (!(own_cap.cap & IEEE80211_HT_CAP_RX_STBC))
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ht_cap.cap &= ~IEEE80211_HT_CAP_TX_STBC;
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ampdu_info = ht_cap_ie->ampdu_params_info;
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ht_cap.ampdu_factor =
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ampdu_info & IEEE80211_HT_AMPDU_PARM_FACTOR;
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ht_cap.ampdu_density =
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(ampdu_info & IEEE80211_HT_AMPDU_PARM_DENSITY) >> 2;
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/* own MCS TX capabilities */
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tx_mcs_set_cap = own_cap.mcs.tx_params;
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/* Copy peer MCS TX capabilities, the driver might need them. */
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ht_cap.mcs.tx_params = ht_cap_ie->mcs.tx_params;
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/* can we TX with MCS rates? */
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if (!(tx_mcs_set_cap & IEEE80211_HT_MCS_TX_DEFINED))
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goto apply;
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/* Counting from 0, therefore +1 */
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if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_RX_DIFF)
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max_tx_streams =
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((tx_mcs_set_cap & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
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>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
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else
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max_tx_streams = IEEE80211_HT_MCS_TX_MAX_STREAMS;
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/*
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* 802.11n-2009 20.3.5 / 20.6 says:
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* - indices 0 to 7 and 32 are single spatial stream
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* - 8 to 31 are multiple spatial streams using equal modulation
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* [8..15 for two streams, 16..23 for three and 24..31 for four]
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* - remainder are multiple spatial streams using unequal modulation
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*/
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for (i = 0; i < max_tx_streams; i++)
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ht_cap.mcs.rx_mask[i] =
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own_cap.mcs.rx_mask[i] & ht_cap_ie->mcs.rx_mask[i];
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if (tx_mcs_set_cap & IEEE80211_HT_MCS_TX_UNEQUAL_MODULATION)
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for (i = IEEE80211_HT_MCS_UNEQUAL_MODULATION_START_BYTE;
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i < IEEE80211_HT_MCS_MASK_LEN; i++)
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ht_cap.mcs.rx_mask[i] =
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own_cap.mcs.rx_mask[i] &
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ht_cap_ie->mcs.rx_mask[i];
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/* handle MCS rate 32 too */
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if (own_cap.mcs.rx_mask[32/8] & ht_cap_ie->mcs.rx_mask[32/8] & 1)
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ht_cap.mcs.rx_mask[32/8] |= 1;
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/* set Rx highest rate */
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ht_cap.mcs.rx_highest = ht_cap_ie->mcs.rx_highest;
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apply:
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changed = memcmp(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
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memcpy(&sta->sta.ht_cap, &ht_cap, sizeof(ht_cap));
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switch (sdata->vif.bss_conf.chandef.width) {
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default:
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WARN_ON_ONCE(1);
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/* fall through */
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case NL80211_CHAN_WIDTH_20_NOHT:
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case NL80211_CHAN_WIDTH_20:
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bw = IEEE80211_STA_RX_BW_20;
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break;
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case NL80211_CHAN_WIDTH_40:
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case NL80211_CHAN_WIDTH_80:
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case NL80211_CHAN_WIDTH_80P80:
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case NL80211_CHAN_WIDTH_160:
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bw = ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
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IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
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break;
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}
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sta->sta.bandwidth = bw;
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sta->cur_max_bandwidth =
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ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 ?
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IEEE80211_STA_RX_BW_40 : IEEE80211_STA_RX_BW_20;
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switch ((ht_cap.cap & IEEE80211_HT_CAP_SM_PS)
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>> IEEE80211_HT_CAP_SM_PS_SHIFT) {
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case WLAN_HT_CAP_SM_PS_INVALID:
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case WLAN_HT_CAP_SM_PS_STATIC:
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smps_mode = IEEE80211_SMPS_STATIC;
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break;
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case WLAN_HT_CAP_SM_PS_DYNAMIC:
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smps_mode = IEEE80211_SMPS_DYNAMIC;
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break;
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case WLAN_HT_CAP_SM_PS_DISABLED:
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smps_mode = IEEE80211_SMPS_OFF;
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break;
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}
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if (smps_mode != sta->sta.smps_mode)
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changed = true;
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sta->sta.smps_mode = smps_mode;
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return changed;
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}
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void ieee80211_sta_tear_down_BA_sessions(struct sta_info *sta,
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enum ieee80211_agg_stop_reason reason)
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{
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int i;
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cancel_work_sync(&sta->ampdu_mlme.work);
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for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
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__ieee80211_stop_tx_ba_session(sta, i, reason);
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__ieee80211_stop_rx_ba_session(sta, i, WLAN_BACK_RECIPIENT,
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WLAN_REASON_QSTA_LEAVE_QBSS,
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reason != AGG_STOP_DESTROY_STA &&
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reason != AGG_STOP_PEER_REQUEST);
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}
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}
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void ieee80211_ba_session_work(struct work_struct *work)
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{
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struct sta_info *sta =
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container_of(work, struct sta_info, ampdu_mlme.work);
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struct tid_ampdu_tx *tid_tx;
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int tid;
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/*
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* When this flag is set, new sessions should be
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* blocked, and existing sessions will be torn
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* down by the code that set the flag, so this
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* need not run.
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*/
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if (test_sta_flag(sta, WLAN_STA_BLOCK_BA))
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return;
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mutex_lock(&sta->ampdu_mlme.mtx);
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for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) {
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if (test_and_clear_bit(tid, sta->ampdu_mlme.tid_rx_timer_expired))
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___ieee80211_stop_rx_ba_session(
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sta, tid, WLAN_BACK_RECIPIENT,
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WLAN_REASON_QSTA_TIMEOUT, true);
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if (test_and_clear_bit(tid,
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sta->ampdu_mlme.tid_rx_stop_requested))
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___ieee80211_stop_rx_ba_session(
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sta, tid, WLAN_BACK_RECIPIENT,
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WLAN_REASON_UNSPECIFIED, true);
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spin_lock_bh(&sta->lock);
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tid_tx = sta->ampdu_mlme.tid_start_tx[tid];
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if (tid_tx) {
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/*
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* Assign it over to the normal tid_tx array
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* where it "goes live".
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*/
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sta->ampdu_mlme.tid_start_tx[tid] = NULL;
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/* could there be a race? */
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if (sta->ampdu_mlme.tid_tx[tid])
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kfree(tid_tx);
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else
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ieee80211_assign_tid_tx(sta, tid, tid_tx);
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spin_unlock_bh(&sta->lock);
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ieee80211_tx_ba_session_handle_start(sta, tid);
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continue;
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}
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spin_unlock_bh(&sta->lock);
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tid_tx = rcu_dereference_protected_tid_tx(sta, tid);
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if (tid_tx && test_and_clear_bit(HT_AGG_STATE_WANT_STOP,
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&tid_tx->state))
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___ieee80211_stop_tx_ba_session(sta, tid,
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AGG_STOP_LOCAL_REQUEST);
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}
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mutex_unlock(&sta->ampdu_mlme.mtx);
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}
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void ieee80211_send_delba(struct ieee80211_sub_if_data *sdata,
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const u8 *da, u16 tid,
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u16 initiator, u16 reason_code)
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{
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb;
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struct ieee80211_mgmt *mgmt;
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u16 params;
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skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
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if (!skb)
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return;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
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memset(mgmt, 0, 24);
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memcpy(mgmt->da, da, ETH_ALEN);
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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if (sdata->vif.type == NL80211_IFTYPE_AP ||
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sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
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sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
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memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
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else if (sdata->vif.type == NL80211_IFTYPE_STATION)
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memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
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else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
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memcpy(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN);
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));
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mgmt->u.action.category = WLAN_CATEGORY_BACK;
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mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
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params = (u16)(initiator << 11); /* bit 11 initiator */
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params |= (u16)(tid << 12); /* bit 15:12 TID number */
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mgmt->u.action.u.delba.params = cpu_to_le16(params);
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mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);
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ieee80211_tx_skb(sdata, skb);
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}
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void ieee80211_process_delba(struct ieee80211_sub_if_data *sdata,
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struct sta_info *sta,
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struct ieee80211_mgmt *mgmt, size_t len)
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{
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u16 tid, params;
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u16 initiator;
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params = le16_to_cpu(mgmt->u.action.u.delba.params);
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tid = (params & IEEE80211_DELBA_PARAM_TID_MASK) >> 12;
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initiator = (params & IEEE80211_DELBA_PARAM_INITIATOR_MASK) >> 11;
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ht_dbg_ratelimited(sdata, "delba from %pM (%s) tid %d reason code %d\n",
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mgmt->sa, initiator ? "initiator" : "recipient",
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tid,
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le16_to_cpu(mgmt->u.action.u.delba.reason_code));
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if (initiator == WLAN_BACK_INITIATOR)
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__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_INITIATOR, 0,
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true);
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else
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__ieee80211_stop_tx_ba_session(sta, tid, AGG_STOP_PEER_REQUEST);
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}
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int ieee80211_send_smps_action(struct ieee80211_sub_if_data *sdata,
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enum ieee80211_smps_mode smps, const u8 *da,
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const u8 *bssid)
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{
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struct ieee80211_local *local = sdata->local;
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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);
|