1 files changed, 384 insertions, 6 deletions

diff --git a/net/mac80211/spectmgmt.c b/net/mac80211/spectmgmt.c
index 578eea3fc04d..7422888d3640 100644
--- a/net/mac80211/spectmgmt.c
+++ b/net/mac80211/spectmgmt.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * spectrum management
  *
@@ -8,10 +9,7 @@
  * 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.
+ * Copyright (C) 2018, 2020, 2022-2024 Intel Corporation
  */
 
 #include <linux/ieee80211.h>
@@ -21,6 +19,387 @@
 #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;
+	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;
+
+		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,
@@ -36,8 +415,7 @@ static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_da
 		return;
 
 	skb_reserve(skb, local->hw.extra_tx_headroom);
-	msr_report = (struct ieee80211_mgmt *)skb_put(skb, 24);
-	memset(msr_report, 0, 24);
+	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);