238 lines
7.5 KiB
C
238 lines
7.5 KiB
C
/*
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* spectrum management
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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 2007-2008, Intel Corporation
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* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
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* Copyright (C) 2018 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 <net/cfg80211.h>
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#include <net/mac80211.h>
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#include "ieee80211_i.h"
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#include "sta_info.h"
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#include "wme.h"
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int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
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struct ieee802_11_elems *elems,
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enum nl80211_band current_band,
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u32 sta_flags, u8 *bssid,
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struct ieee80211_csa_ie *csa_ie)
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{
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enum nl80211_band new_band = current_band;
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int new_freq;
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u8 new_chan_no;
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struct ieee80211_channel *new_chan;
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struct cfg80211_chan_def new_vht_chandef = {};
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const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
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const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
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int secondary_channel_offset = -1;
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memset(csa_ie, 0, sizeof(*csa_ie));
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sec_chan_offs = elems->sec_chan_offs;
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wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
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if (sta_flags & (IEEE80211_STA_DISABLE_HT |
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IEEE80211_STA_DISABLE_40MHZ)) {
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sec_chan_offs = NULL;
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wide_bw_chansw_ie = NULL;
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}
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if (sta_flags & IEEE80211_STA_DISABLE_VHT)
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wide_bw_chansw_ie = NULL;
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if (elems->ext_chansw_ie) {
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if (!ieee80211_operating_class_to_band(
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elems->ext_chansw_ie->new_operating_class,
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&new_band)) {
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sdata_info(sdata,
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"cannot understand ECSA IE operating class, %d, ignoring\n",
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elems->ext_chansw_ie->new_operating_class);
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}
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new_chan_no = elems->ext_chansw_ie->new_ch_num;
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csa_ie->count = elems->ext_chansw_ie->count;
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csa_ie->mode = elems->ext_chansw_ie->mode;
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} else if (elems->ch_switch_ie) {
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new_chan_no = elems->ch_switch_ie->new_ch_num;
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csa_ie->count = elems->ch_switch_ie->count;
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csa_ie->mode = elems->ch_switch_ie->mode;
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} else {
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/* nothing here we understand */
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return 1;
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}
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/* Mesh Channel Switch Parameters Element */
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if (elems->mesh_chansw_params_ie) {
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csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
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csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
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csa_ie->pre_value = le16_to_cpu(
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elems->mesh_chansw_params_ie->mesh_pre_value);
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if (elems->mesh_chansw_params_ie->mesh_flags &
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WLAN_EID_CHAN_SWITCH_PARAM_REASON)
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csa_ie->reason_code = le16_to_cpu(
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elems->mesh_chansw_params_ie->mesh_reason);
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}
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new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
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new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
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if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
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sdata_info(sdata,
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"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
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bssid, new_freq);
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return -EINVAL;
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}
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if (sec_chan_offs) {
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secondary_channel_offset = sec_chan_offs->sec_chan_offs;
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} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
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/* If the secondary channel offset IE is not present,
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* we can't know what's the post-CSA offset, so the
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* best we can do is use 20MHz.
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*/
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secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
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}
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switch (secondary_channel_offset) {
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default:
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/* secondary_channel_offset was present but is invalid */
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case IEEE80211_HT_PARAM_CHA_SEC_NONE:
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cfg80211_chandef_create(&csa_ie->chandef, new_chan,
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NL80211_CHAN_HT20);
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break;
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case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
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cfg80211_chandef_create(&csa_ie->chandef, new_chan,
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NL80211_CHAN_HT40PLUS);
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break;
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case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
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cfg80211_chandef_create(&csa_ie->chandef, new_chan,
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NL80211_CHAN_HT40MINUS);
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break;
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case -1:
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cfg80211_chandef_create(&csa_ie->chandef, new_chan,
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NL80211_CHAN_NO_HT);
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/* keep width for 5/10 MHz channels */
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switch (sdata->vif.bss_conf.chandef.width) {
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case NL80211_CHAN_WIDTH_5:
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case NL80211_CHAN_WIDTH_10:
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csa_ie->chandef.width =
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sdata->vif.bss_conf.chandef.width;
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break;
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default:
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break;
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}
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break;
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}
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if (wide_bw_chansw_ie) {
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struct ieee80211_vht_operation vht_oper = {
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.chan_width =
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wide_bw_chansw_ie->new_channel_width,
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.center_freq_seg0_idx =
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wide_bw_chansw_ie->new_center_freq_seg0,
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.center_freq_seg1_idx =
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wide_bw_chansw_ie->new_center_freq_seg1,
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/* .basic_mcs_set doesn't matter */
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};
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/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
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* to the previously parsed chandef
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*/
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new_vht_chandef = csa_ie->chandef;
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/* ignore if parsing fails */
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if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
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new_vht_chandef.chan = NULL;
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if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
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new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
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ieee80211_chandef_downgrade(&new_vht_chandef);
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if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
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new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
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ieee80211_chandef_downgrade(&new_vht_chandef);
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}
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/* if VHT data is there validate & use it */
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if (new_vht_chandef.chan) {
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if (!cfg80211_chandef_compatible(&new_vht_chandef,
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&csa_ie->chandef)) {
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sdata_info(sdata,
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"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
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bssid);
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return -EINVAL;
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}
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csa_ie->chandef = new_vht_chandef;
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}
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return 0;
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}
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static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_msrment_ie *request_ie,
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const u8 *da, const u8 *bssid,
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u8 dialog_token)
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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 *msr_report;
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skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
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sizeof(struct ieee80211_msrment_ie));
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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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msr_report = skb_put_zero(skb, 24);
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memcpy(msr_report->da, da, ETH_ALEN);
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memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
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memcpy(msr_report->bssid, bssid, ETH_ALEN);
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msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
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msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
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msr_report->u.action.u.measurement.action_code =
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WLAN_ACTION_SPCT_MSR_RPRT;
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msr_report->u.action.u.measurement.dialog_token = dialog_token;
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msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
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msr_report->u.action.u.measurement.length =
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sizeof(struct ieee80211_msrment_ie);
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memset(&msr_report->u.action.u.measurement.msr_elem, 0,
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sizeof(struct ieee80211_msrment_ie));
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msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
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msr_report->u.action.u.measurement.msr_elem.mode |=
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IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
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msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
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ieee80211_tx_skb(sdata, skb);
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}
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void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
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struct ieee80211_mgmt *mgmt,
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size_t len)
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{
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/*
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* Ignoring measurement request is spec violation.
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* Mandatory measurements must be reported optional
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* measurements might be refused or reported incapable
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* For now just refuse
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* TODO: Answer basic measurement as unmeasured
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*/
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ieee80211_send_refuse_measurement_request(sdata,
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&mgmt->u.action.u.measurement.msr_elem,
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mgmt->sa, mgmt->bssid,
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mgmt->u.action.u.measurement.dialog_token);
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}
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