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linux/net/mac80211/spectmgmt.c
Michael-CY Lee 21c3f8f955 wifi: mac80211: refactor STA CSA parsing flows 
The new Wi-Fi Standard (IEEE Std 802.11-2020 9.4.2.160) specifies that
the Wide Bandwidth Channel Switch (WBCS) Element subfields have the same
definitions as VHT operation information if the operating band is not
S1G.

The problem comes when the BSS is in 6 GHz band, the STA parses the WBCS
Element by ieee80211_chandef_vht_oper(), which checks the capabilities for
HT/VHT mode, not HE/EHT mode.

This patch refactors STA CSA parsing flow so that the corresponding
capabilities can be checked. Also, it adds the way to use op_class in ECSA
Element to build a new chandef.

In summary, the new steps for STA to handle CSA event are:
1. build the new chandef from one of the CSA-related (Sub)Elements in
   following order,
   - Bandwidth Indication (Sub)Element
   - Wide Bandwidth Channel Switch (Sub)Element
   - Operating class in Extended Channel Switch Announcement Element
   - Channel Switch Announcement Element
2. convert the new chandef into operation information according to the
   operating band in order to check if the new chandef fits STA's
   capabilities.
3. downgrade the bandwidth until current bandwidth is not disabled.

Co-developed-by: Money Wang <money.wang@mediatek.com>
Signed-off-by: Michael-CY Lee <michael-cy.lee@mediatek.com>
Link: https://msgid.link/20231222010914.6521-3-michael-cy.lee@mediatek.com
[rebase on top of the changes with struct ieee80211_conn_settings,
 prefer leXY_encode_bits()]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2024-02-08 15:00:45 +01:00

454 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
* Copyright (C) 2018, 2020, 2022-2023 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;
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) {
if (!ieee80211_chandef_he_6ghz_oper(local, &he._oper,
NULL, chandef))
chandef->chan = 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;
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,
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;
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) {
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;
}
/* 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);
} 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) {
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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