// SPDX-License-Identifier: GPL-2.0-only
/*
* spectrum management
*
* Copyright 2003, Jouni Malinen <[email protected]>
* Copyright 2002-2005, Instant802 Networks, Inc.
* Copyright 2005-2006, Devicescape Software, Inc.
* Copyright 2006-2007 Jiri Benc <[email protected]>
* Copyright 2007, Michael Wu <[email protected]>
* Copyright 2007-2008, Intel Corporation
* Copyright 2008, Johannes Berg <[email protected]>
* Copyright (C) 2018, 2020, 2022-2024 Intel Corporation
*/
#include <linux/ieee80211.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include "ieee80211_i.h"
#include "sta_info.h"
#include "wme.h"
static bool
wbcs_elem_to_chandef(const struct ieee80211_wide_bw_chansw_ie *wbcs_elem,
struct cfg80211_chan_def *chandef)
{
u8 ccfs0 = wbcs_elem->new_center_freq_seg0;
u8 ccfs1 = wbcs_elem->new_center_freq_seg1;
u32 cf0 = ieee80211_channel_to_frequency(ccfs0, chandef->chan->band);
u32 cf1 = ieee80211_channel_to_frequency(ccfs1, chandef->chan->band);
switch (wbcs_elem->new_channel_width) {
case IEEE80211_VHT_CHANWIDTH_160MHZ:
/* deprecated encoding */
chandef->width = NL80211_CHAN_WIDTH_160;
chandef->center_freq1 = cf0;
break;
case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
/* deprecated encoding */
chandef->width = NL80211_CHAN_WIDTH_80P80;
chandef->center_freq1 = cf0;
chandef->center_freq2 = cf1;
break;
case IEEE80211_VHT_CHANWIDTH_80MHZ:
chandef->width = NL80211_CHAN_WIDTH_80;
chandef->center_freq1 = cf0;
if (ccfs1) {
u8 diff = abs(ccfs0 - ccfs1);
if (diff == 8) {
chandef->width = NL80211_CHAN_WIDTH_160;
chandef->center_freq1 = cf1;
} else if (diff > 8) {
chandef->width = NL80211_CHAN_WIDTH_80P80;
chandef->center_freq2 = cf1;
}
}
break;
case IEEE80211_VHT_CHANWIDTH_USE_HT:
default:
/* If the WBCS Element is present, new channel bandwidth is
* at least 40 MHz.
*/
chandef->width = NL80211_CHAN_WIDTH_40;
chandef->center_freq1 = cf0;
break;
}
return cfg80211_chandef_valid(chandef);
}
static void
validate_chandef_by_ht_vht_oper(struct ieee80211_sub_if_data *sdata,
struct ieee80211_conn_settings *conn,
u32 vht_cap_info,
struct cfg80211_chan_def *chandef)
{
u32 control_freq, center_freq1, center_freq2;
enum nl80211_chan_width chan_width;
struct ieee80211_ht_operation ht_oper;
struct ieee80211_vht_operation vht_oper;
if (conn->mode < IEEE80211_CONN_MODE_HT ||
conn->bw_limit < IEEE80211_CONN_BW_LIMIT_40) {
chandef->chan = NULL;
return;
}
control_freq = chandef->chan->center_freq;
center_freq1 = chandef->center_freq1;
center_freq2 = chandef->center_freq2;
chan_width = chandef->width;
ht_oper.primary_chan = ieee80211_frequency_to_channel(control_freq);
if (control_freq != center_freq1)
ht_oper.ht_param = control_freq > center_freq1 ?
IEEE80211_HT_PARAM_CHA_SEC_BELOW :
IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
else
ht_oper.ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
ieee80211_chandef_ht_oper(&ht_oper, chandef);
if (conn->mode < IEEE80211_CONN_MODE_VHT)
return;
vht_oper.center_freq_seg0_idx =
ieee80211_frequency_to_channel(center_freq1);
vht_oper.center_freq_seg1_idx = center_freq2 ?
ieee80211_frequency_to_channel(center_freq2) : 0;
switch (chan_width) {
case NL80211_CHAN_WIDTH_320:
WARN_ON(1);
break;
case NL80211_CHAN_WIDTH_160:
vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
vht_oper.center_freq_seg1_idx = vht_oper.center_freq_seg0_idx;
vht_oper.center_freq_seg0_idx +=
control_freq < center_freq1 ? -8 : 8;
break;
case NL80211_CHAN_WIDTH_80P80:
vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
break;
case NL80211_CHAN_WIDTH_80:
vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
break;
default:
vht_oper.chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
break;
}
ht_oper.operation_mode =
le16_encode_bits(vht_oper.center_freq_seg1_idx,
IEEE80211_HT_OP_MODE_CCFS2_MASK);
if (!ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
&vht_oper, &ht_oper, chandef))
chandef->chan = NULL;
}
static void
validate_chandef_by_6ghz_he_eht_oper(struct ieee80211_sub_if_data *sdata,
struct ieee80211_conn_settings *conn,
struct cfg80211_chan_def *chandef)
{
struct ieee80211_local *local = sdata->local;
u32 control_freq, center_freq1, center_freq2;
enum nl80211_chan_width chan_width;
struct {
struct ieee80211_he_operation _oper;
struct ieee80211_he_6ghz_oper _6ghz_oper;
} __packed he;
struct {
struct ieee80211_eht_operation _oper;
struct ieee80211_eht_operation_info _oper_info;
} __packed eht;
const struct ieee80211_eht_operation *eht_oper;
if (conn->mode < IEEE80211_CONN_MODE_HE) {
chandef->chan = NULL;
return;
}
control_freq = chandef->chan->center_freq;
center_freq1 = chandef->center_freq1;
center_freq2 = chandef->center_freq2;
chan_width = chandef->width;
he._oper.he_oper_params =
le32_encode_bits(1, IEEE80211_HE_OPERATION_6GHZ_OP_INFO);
he._6ghz_oper.primary =
ieee80211_frequency_to_channel(control_freq);
he._6ghz_oper.ccfs0 = ieee80211_frequency_to_channel(center_freq1);
he._6ghz_oper.ccfs1 = center_freq2 ?
ieee80211_frequency_to_channel(center_freq2) : 0;
switch (chan_width) {
case NL80211_CHAN_WIDTH_320:
he._6ghz_oper.ccfs1 = he._6ghz_oper.ccfs0;
he._6ghz_oper.ccfs0 += control_freq < center_freq1 ? -16 : 16;
he._6ghz_oper.control = IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ;
break;
case NL80211_CHAN_WIDTH_160:
he._6ghz_oper.ccfs1 = he._6ghz_oper.ccfs0;
he._6ghz_oper.ccfs0 += control_freq < center_freq1 ? -8 : 8;
fallthrough;
case NL80211_CHAN_WIDTH_80P80:
he._6ghz_oper.control =
IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
break;
case NL80211_CHAN_WIDTH_80:
he._6ghz_oper.control =
IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
break;
case NL80211_CHAN_WIDTH_40:
he._6ghz_oper.control =
IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
break;
default:
he._6ghz_oper.control =
IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ;
break;
}
if (conn->mode < IEEE80211_CONN_MODE_EHT) {
eht_oper = NULL;
} else {
eht._oper.params = IEEE80211_EHT_OPER_INFO_PRESENT;
eht._oper_info.control = he._6ghz_oper.control;
eht._oper_info.ccfs0 = he._6ghz_oper.ccfs0;
eht._oper_info.ccfs1 = he._6ghz_oper.ccfs1;
eht_oper = &eht._oper;
}
if (!ieee80211_chandef_he_6ghz_oper(local, &he._oper,
eht_oper, chandef))
chandef->chan = NULL;
}
int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
struct ieee802_11_elems *elems,
enum nl80211_band current_band,
u32 vht_cap_info,
struct ieee80211_conn_settings *conn,
u8 *bssid, bool unprot_action,
struct ieee80211_csa_ie *csa_ie)
{
enum nl80211_band new_band = current_band;
int new_freq;
u8 new_chan_no = 0, new_op_class = 0;
struct ieee80211_channel *new_chan;
struct cfg80211_chan_def new_chandef = {};
const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
const struct ieee80211_bandwidth_indication *bwi;
const struct ieee80211_ext_chansw_ie *ext_chansw_elem;
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;
bwi = elems->bandwidth_indication;
ext_chansw_elem = elems->ext_chansw_ie;
if (conn->mode < IEEE80211_CONN_MODE_HT ||
conn->bw_limit < IEEE80211_CONN_BW_LIMIT_40) {
sec_chan_offs = NULL;
wide_bw_chansw_ie = NULL;
}
if (conn->mode < IEEE80211_CONN_MODE_VHT)
wide_bw_chansw_ie = NULL;
if (ext_chansw_elem) {
new_op_class = ext_chansw_elem->new_operating_class;
if (!ieee80211_operating_class_to_band(new_op_class, &new_band)) {
new_op_class = 0;
if (!unprot_action)
sdata_info(sdata,
"cannot understand ECSA IE operating class, %d, ignoring\n",
ext_chansw_elem->new_operating_class);
} else {
new_chan_no = ext_chansw_elem->new_ch_num;
csa_ie->count = ext_chansw_elem->count;
csa_ie->mode = ext_chansw_elem->mode;
}
}
if (!new_op_class && elems->ch_switch_ie) {
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;
}
/* nothing here we understand */
if (!new_chan_no)
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) {
if (!unprot_action)
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 (conn->mode >= IEEE80211_CONN_MODE_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->chanreq.oper, new_chan,
NL80211_CHAN_HT20);
break;
case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
cfg80211_chandef_create(&csa_ie->chanreq.oper, new_chan,
NL80211_CHAN_HT40PLUS);
break;
case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
cfg80211_chandef_create(&csa_ie->chanreq.oper, new_chan,
NL80211_CHAN_HT40MINUS);
break;
case -1:
cfg80211_chandef_create(&csa_ie->chanreq.oper, new_chan,
NL80211_CHAN_NO_HT);
/* keep width for 5/10 MHz channels */
switch (sdata->vif.bss_conf.chanreq.oper.width) {
case NL80211_CHAN_WIDTH_5:
case NL80211_CHAN_WIDTH_10:
csa_ie->chanreq.oper.width =
sdata->vif.bss_conf.chanreq.oper.width;
break;
default:
break;
}
break;
}
/* capture the AP configuration */
csa_ie->chanreq.ap = csa_ie->chanreq.oper;
/* parse one of the Elements to build a new chandef */
memset(&new_chandef, 0, sizeof(new_chandef));
new_chandef.chan = new_chan;
if (bwi) {
/* start with the CSA one */
new_chandef = csa_ie->chanreq.oper;
/* and update the width accordingly */
ieee80211_chandef_eht_oper(&bwi->info, &new_chandef);
if (bwi->params & IEEE80211_BW_IND_DIS_SUBCH_PRESENT)
new_chandef.punctured =
get_unaligned_le16(bwi->info.optional);
} else if (!wide_bw_chansw_ie || !wbcs_elem_to_chandef(wide_bw_chansw_ie,
&new_chandef)) {
if (!ieee80211_operating_class_to_chandef(new_op_class, new_chan,
&new_chandef))
new_chandef = csa_ie->chanreq.oper;
}
/* check if the new chandef fits the capabilities */
if (new_band == NL80211_BAND_6GHZ)
validate_chandef_by_6ghz_he_eht_oper(sdata, conn, &new_chandef);
else
validate_chandef_by_ht_vht_oper(sdata, conn, vht_cap_info,
&new_chandef);
/* if data is there validate the bandwidth & use it */
if (new_chandef.chan) {
/* capture the AP chandef before (potential) downgrading */
csa_ie->chanreq.ap = new_chandef;
if (conn->bw_limit < IEEE80211_CONN_BW_LIMIT_320 &&
new_chandef.width == NL80211_CHAN_WIDTH_320)
ieee80211_chandef_downgrade(&new_chandef, NULL);
if (conn->bw_limit < IEEE80211_CONN_BW_LIMIT_160 &&
(new_chandef.width == NL80211_CHAN_WIDTH_80P80 ||
new_chandef.width == NL80211_CHAN_WIDTH_160))
ieee80211_chandef_downgrade(&new_chandef, NULL);
if (!cfg80211_chandef_compatible(&new_chandef,
&csa_ie->chanreq.oper)) {
sdata_info(sdata,
"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
bssid);
return -EINVAL;
}
csa_ie->chanreq.oper = new_chandef;
}
if (elems->max_channel_switch_time)
csa_ie->max_switch_time =
(elems->max_channel_switch_time[0] << 0) |
(elems->max_channel_switch_time[1] << 8) |
(elems->max_channel_switch_time[2] << 16);
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);
}
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