summaryrefslogtreecommitdiffstats
path: root/net/mac80211/spectmgmt.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/mac80211/spectmgmt.c')
-rw-r--r--net/mac80211/spectmgmt.c446
1 files changed, 446 insertions, 0 deletions
diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c
new file mode 100644
index 000000000..880f46257
--- /dev/null
+++ b/net/mac80211/spectmgmt.c
@@ -0,0 +1,446 @@
+// 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, 2022-2024, 2026 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;
+ DEFINE_RAW_FLEX(struct ieee80211_he_operation, he, optional,
+ sizeof(struct ieee80211_he_6ghz_oper));
+ struct ieee80211_he_6ghz_oper *_6ghz_oper =
+ (struct ieee80211_he_6ghz_oper *)he->optional;
+ DEFINE_RAW_FLEX(struct ieee80211_eht_operation, eht, optional,
+ sizeof(struct ieee80211_eht_operation_info));
+ struct ieee80211_eht_operation_info *_oper_info =
+ (struct ieee80211_eht_operation_info *)eht->optional;
+ 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->he_oper_params =
+ le32_encode_bits(1, IEEE80211_HE_OPERATION_6GHZ_OP_INFO);
+ _6ghz_oper->primary =
+ ieee80211_frequency_to_channel(control_freq);
+ _6ghz_oper->ccfs0 = ieee80211_frequency_to_channel(center_freq1);
+ _6ghz_oper->ccfs1 = center_freq2 ?
+ ieee80211_frequency_to_channel(center_freq2) : 0;
+
+ switch (chan_width) {
+ case NL80211_CHAN_WIDTH_320:
+ _6ghz_oper->ccfs1 = _6ghz_oper->ccfs0;
+ _6ghz_oper->ccfs0 += control_freq < center_freq1 ? -16 : 16;
+ _6ghz_oper->control = IEEE80211_EHT_OPER_CHAN_WIDTH_320MHZ;
+ break;
+ case NL80211_CHAN_WIDTH_160:
+ _6ghz_oper->ccfs1 = _6ghz_oper->ccfs0;
+ _6ghz_oper->ccfs0 += control_freq < center_freq1 ? -8 : 8;
+ fallthrough;
+ case NL80211_CHAN_WIDTH_80P80:
+ _6ghz_oper->control =
+ IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ;
+ break;
+ case NL80211_CHAN_WIDTH_80:
+ _6ghz_oper->control =
+ IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ;
+ break;
+ case NL80211_CHAN_WIDTH_40:
+ _6ghz_oper->control =
+ IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ;
+ break;
+ default:
+ _6ghz_oper->control =
+ IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ;
+ break;
+ }
+
+ if (conn->mode < IEEE80211_CONN_MODE_EHT) {
+ eht_oper = NULL;
+ } else {
+ eht->params = IEEE80211_EHT_OPER_INFO_PRESENT;
+ _oper_info->control = _6ghz_oper->control;
+ _oper_info->ccfs0 = _6ghz_oper->ccfs0;
+ _oper_info->ccfs1 = _6ghz_oper->ccfs1;
+ eht_oper = eht;
+ }
+
+ if (!ieee80211_chandef_he_6ghz_oper(local, he, 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;
+ int new_chan_no = -1, new_op_class = -1;
+ 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 = -1;
+ 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 < 0 && 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 < 0)
+ 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);
+ 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 (new_op_class < 0 ||
+ !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;
+
+ while (conn->bw_limit <
+ ieee80211_min_bw_limit_from_chandef(&new_chandef))
+ 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(IEEE80211_MIN_ACTION_SIZE(measurement) +
+ local->hw.extra_tx_headroom);
+ if (!skb)
+ return;
+
+ skb_reserve(skb, local->hw.extra_tx_headroom);
+ msr_report = skb_put_zero(skb, IEEE80211_MIN_ACTION_SIZE(measurement));
+ 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);
+
+ msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
+ msr_report->u.action.action_code = WLAN_ACTION_SPCT_MSR_RPRT;
+
+ msr_report->u.action.measurement.dialog_token = dialog_token;
+ msr_report->u.action.measurement.element_id = WLAN_EID_MEASURE_REPORT;
+ msr_report->u.action.measurement.length =
+ sizeof(struct ieee80211_msrment_ie);
+ msr_report->u.action.measurement.msr_elem.token = request_ie->token;
+ msr_report->u.action.measurement.msr_elem.mode |=
+ IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
+ msr_report->u.action.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.measurement.msr_elem,
+ mgmt->sa, mgmt->bssid,
+ mgmt->u.action.measurement.dialog_token);
+}
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-30 09:58:01 +0000