239 lines
7.5 KiB
C
239 lines
7.5 KiB
C
/*
|
|
* spectrum management
|
|
*
|
|
* 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 2007-2008, Intel Corporation
|
|
* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
|
|
*
|
|
* 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 <net/cfg80211.h>
|
|
#include <net/mac80211.h>
|
|
#include "ieee80211_i.h"
|
|
#include "sta_info.h"
|
|
#include "wme.h"
|
|
|
|
int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
|
|
struct ieee802_11_elems *elems,
|
|
enum nl80211_band current_band,
|
|
u32 sta_flags, u8 *bssid,
|
|
struct ieee80211_csa_ie *csa_ie)
|
|
{
|
|
enum nl80211_band new_band;
|
|
int new_freq;
|
|
u8 new_chan_no;
|
|
struct ieee80211_channel *new_chan;
|
|
struct cfg80211_chan_def new_vht_chandef = {};
|
|
const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
|
|
const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
|
|
int secondary_channel_offset = -1;
|
|
|
|
memset(csa_ie, 0, sizeof(*csa_ie));
|
|
|
|
sec_chan_offs = elems->sec_chan_offs;
|
|
wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
|
|
|
|
if (sta_flags & (IEEE80211_STA_DISABLE_HT |
|
|
IEEE80211_STA_DISABLE_40MHZ)) {
|
|
sec_chan_offs = NULL;
|
|
wide_bw_chansw_ie = NULL;
|
|
}
|
|
|
|
if (sta_flags & IEEE80211_STA_DISABLE_VHT)
|
|
wide_bw_chansw_ie = NULL;
|
|
|
|
if (elems->ext_chansw_ie) {
|
|
if (!ieee80211_operating_class_to_band(
|
|
elems->ext_chansw_ie->new_operating_class,
|
|
&new_band)) {
|
|
sdata_info(sdata,
|
|
"cannot understand ECSA IE operating class %d, disconnecting\n",
|
|
elems->ext_chansw_ie->new_operating_class);
|
|
return -EINVAL;
|
|
}
|
|
new_chan_no = elems->ext_chansw_ie->new_ch_num;
|
|
csa_ie->count = elems->ext_chansw_ie->count;
|
|
csa_ie->mode = elems->ext_chansw_ie->mode;
|
|
} else if (elems->ch_switch_ie) {
|
|
new_band = current_band;
|
|
new_chan_no = elems->ch_switch_ie->new_ch_num;
|
|
csa_ie->count = elems->ch_switch_ie->count;
|
|
csa_ie->mode = elems->ch_switch_ie->mode;
|
|
} else {
|
|
/* nothing here we understand */
|
|
return 1;
|
|
}
|
|
|
|
/* Mesh Channel Switch Parameters Element */
|
|
if (elems->mesh_chansw_params_ie) {
|
|
csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
|
|
csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
|
|
csa_ie->pre_value = le16_to_cpu(
|
|
elems->mesh_chansw_params_ie->mesh_pre_value);
|
|
|
|
if (elems->mesh_chansw_params_ie->mesh_flags &
|
|
WLAN_EID_CHAN_SWITCH_PARAM_REASON)
|
|
csa_ie->reason_code = le16_to_cpu(
|
|
elems->mesh_chansw_params_ie->mesh_reason);
|
|
}
|
|
|
|
new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
|
|
new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
|
|
if (!new_chan || new_chan->flags & IEEE80211_CHAN_DISABLED) {
|
|
sdata_info(sdata,
|
|
"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
|
|
bssid, new_freq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (sec_chan_offs) {
|
|
secondary_channel_offset = sec_chan_offs->sec_chan_offs;
|
|
} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
|
|
/* If the secondary channel offset IE is not present,
|
|
* we can't know what's the post-CSA offset, so the
|
|
* best we can do is use 20MHz.
|
|
*/
|
|
secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
|
|
}
|
|
|
|
switch (secondary_channel_offset) {
|
|
default:
|
|
/* secondary_channel_offset was present but is invalid */
|
|
case IEEE80211_HT_PARAM_CHA_SEC_NONE:
|
|
cfg80211_chandef_create(&csa_ie->chandef, new_chan,
|
|
NL80211_CHAN_HT20);
|
|
break;
|
|
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
|
|
cfg80211_chandef_create(&csa_ie->chandef, new_chan,
|
|
NL80211_CHAN_HT40PLUS);
|
|
break;
|
|
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
|
|
cfg80211_chandef_create(&csa_ie->chandef, new_chan,
|
|
NL80211_CHAN_HT40MINUS);
|
|
break;
|
|
case -1:
|
|
cfg80211_chandef_create(&csa_ie->chandef, new_chan,
|
|
NL80211_CHAN_NO_HT);
|
|
/* keep width for 5/10 MHz channels */
|
|
switch (sdata->vif.bss_conf.chandef.width) {
|
|
case NL80211_CHAN_WIDTH_5:
|
|
case NL80211_CHAN_WIDTH_10:
|
|
csa_ie->chandef.width =
|
|
sdata->vif.bss_conf.chandef.width;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (wide_bw_chansw_ie) {
|
|
struct ieee80211_vht_operation vht_oper = {
|
|
.chan_width =
|
|
wide_bw_chansw_ie->new_channel_width,
|
|
.center_freq_seg0_idx =
|
|
wide_bw_chansw_ie->new_center_freq_seg0,
|
|
.center_freq_seg1_idx =
|
|
wide_bw_chansw_ie->new_center_freq_seg1,
|
|
/* .basic_mcs_set doesn't matter */
|
|
};
|
|
|
|
/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
|
|
* to the previously parsed chandef
|
|
*/
|
|
new_vht_chandef = csa_ie->chandef;
|
|
|
|
/* ignore if parsing fails */
|
|
if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
|
|
new_vht_chandef.chan = NULL;
|
|
|
|
if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
|
|
new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
|
|
ieee80211_chandef_downgrade(&new_vht_chandef);
|
|
if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
|
|
new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
|
|
ieee80211_chandef_downgrade(&new_vht_chandef);
|
|
}
|
|
|
|
/* if VHT data is there validate & use it */
|
|
if (new_vht_chandef.chan) {
|
|
if (!cfg80211_chandef_compatible(&new_vht_chandef,
|
|
&csa_ie->chandef)) {
|
|
sdata_info(sdata,
|
|
"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
|
|
bssid);
|
|
return -EINVAL;
|
|
}
|
|
csa_ie->chandef = new_vht_chandef;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
|
|
struct ieee80211_msrment_ie *request_ie,
|
|
const u8 *da, const u8 *bssid,
|
|
u8 dialog_token)
|
|
{
|
|
struct ieee80211_local *local = sdata->local;
|
|
struct sk_buff *skb;
|
|
struct ieee80211_mgmt *msr_report;
|
|
|
|
skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
|
|
sizeof(struct ieee80211_msrment_ie));
|
|
if (!skb)
|
|
return;
|
|
|
|
skb_reserve(skb, local->hw.extra_tx_headroom);
|
|
msr_report = skb_put_zero(skb, 24);
|
|
memcpy(msr_report->da, da, ETH_ALEN);
|
|
memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
|
|
memcpy(msr_report->bssid, bssid, ETH_ALEN);
|
|
msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
|
|
IEEE80211_STYPE_ACTION);
|
|
|
|
skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
|
|
msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
|
|
msr_report->u.action.u.measurement.action_code =
|
|
WLAN_ACTION_SPCT_MSR_RPRT;
|
|
msr_report->u.action.u.measurement.dialog_token = dialog_token;
|
|
|
|
msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
|
|
msr_report->u.action.u.measurement.length =
|
|
sizeof(struct ieee80211_msrment_ie);
|
|
|
|
memset(&msr_report->u.action.u.measurement.msr_elem, 0,
|
|
sizeof(struct ieee80211_msrment_ie));
|
|
msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
|
|
msr_report->u.action.u.measurement.msr_elem.mode |=
|
|
IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
|
|
msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
|
|
|
|
ieee80211_tx_skb(sdata, skb);
|
|
}
|
|
|
|
void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
|
|
struct ieee80211_mgmt *mgmt,
|
|
size_t len)
|
|
{
|
|
/*
|
|
* Ignoring measurement request is spec violation.
|
|
* Mandatory measurements must be reported optional
|
|
* measurements might be refused or reported incapable
|
|
* For now just refuse
|
|
* TODO: Answer basic measurement as unmeasured
|
|
*/
|
|
ieee80211_send_refuse_measurement_request(sdata,
|
|
&mgmt->u.action.u.measurement.msr_elem,
|
|
mgmt->sa, mgmt->bssid,
|
|
mgmt->u.action.u.measurement.dialog_token);
|
|
}
|