[linux-block.git] / net / mac80211 / spectmgmt.c

// 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 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"

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,
				 ieee80211_conn_flags_t conn_flags, u8 *bssid,
				 struct ieee80211_csa_ie *csa_ie)
{
	enum nl80211_band new_band = current_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 (conn_flags & (IEEE80211_CONN_DISABLE_HT |
			  IEEE80211_CONN_DISABLE_40MHZ)) {
		sec_chan_offs = NULL;
		wide_bw_chansw_ie = NULL;
	}

	if (conn_flags & IEEE80211_CONN_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, ignoring\n",
				   elems->ext_chansw_ie->new_operating_class);
		}
		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_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 (!(conn_flags & IEEE80211_CONN_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) {
		u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
		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 = new_seg1,
			/* .basic_mcs_set doesn't matter */
		};
		struct ieee80211_ht_operation ht_oper = {
			.operation_mode =
				cpu_to_le16(new_seg1 <<
					    IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
		};

		/* 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(&sdata->local->hw,
						vht_cap_info,
						&vht_oper, &ht_oper,
						&new_vht_chandef))
			new_vht_chandef.chan = NULL;

		if (conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ &&
		    new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
			ieee80211_chandef_downgrade(&new_vht_chandef);
		if (conn_flags & IEEE80211_CONN_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;
	}

	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);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
39192c0b JB	2	/*
	3	* spectrum management
	4	*
	5	* Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
	6	* Copyright 2002-2005, Instant802 Networks, Inc.
	7	* Copyright 2005-2006, Devicescape Software, Inc.
	8	* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
	9	* Copyright 2007, Michael Wu <flamingice@sourmilk.net>
	10	* Copyright 2007-2008, Intel Corporation
	11	* Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
ba323e29	12	* Copyright (C) 2018, 2020, 2022 Intel Corporation
39192c0b JB	13	*/
	14
	15	#include <linux/ieee80211.h>
d3236553	16	#include <net/cfg80211.h>
39192c0b JB	17	#include <net/mac80211.h>
	18	#include "ieee80211_i.h"
	19	#include "sta_info.h"
	20	#include "wme.h"
	21
e6b7cde4	22	int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
84469a45	23	struct ieee802_11_elems *elems,
57fbcce3	24	enum nl80211_band current_band,
2a333a0d	25	u32 vht_cap_info,
ba323e29	26	ieee80211_conn_flags_t conn_flags, u8 *bssid,
c0f17eb9	27	struct ieee80211_csa_ie *csa_ie)
e6b7cde4	28	{
191da271	29	enum nl80211_band new_band = current_band;
e6b7cde4 SW	30	int new_freq;
	31	u8 new_chan_no;
	32	struct ieee80211_channel *new_chan;
	33	struct cfg80211_chan_def new_vht_chandef = {};
	34	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
	35	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
e6b7cde4 SW	36	int secondary_channel_offset = -1;
e6b7cde4 SW	37
61b81b40 JB	38	memset(csa_ie, 0, sizeof(*csa_ie));
61b81b40 JB	39
e6b7cde4 SW	40	sec_chan_offs = elems->sec_chan_offs;
e6b7cde4 SW	41	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
e6b7cde4	42
ba323e29 JB	43	if (conn_flags & (IEEE80211_CONN_DISABLE_HT \|
ba323e29 JB	44	IEEE80211_CONN_DISABLE_40MHZ)) {
e6b7cde4 SW	45	sec_chan_offs = NULL;
e6b7cde4 SW	46	wide_bw_chansw_ie = NULL;
e6b7cde4 SW	47	}
e6b7cde4 SW	48
ba323e29	49	if (conn_flags & IEEE80211_CONN_DISABLE_VHT)
e6b7cde4 SW	50	wide_bw_chansw_ie = NULL;
	51
	52	if (elems->ext_chansw_ie) {
	53	if (!ieee80211_operating_class_to_band(
	54	elems->ext_chansw_ie->new_operating_class,
	55	&new_band)) {
	56	sdata_info(sdata,
191da271	57	"cannot understand ECSA IE operating class, %d, ignoring\n",
e6b7cde4	58	elems->ext_chansw_ie->new_operating_class);
e6b7cde4 SW	59	}
e6b7cde4 SW	60	new_chan_no = elems->ext_chansw_ie->new_ch_num;
c0f17eb9 CYY	61	csa_ie->count = elems->ext_chansw_ie->count;
c0f17eb9 CYY	62	csa_ie->mode = elems->ext_chansw_ie->mode;
e6b7cde4	63	} else if (elems->ch_switch_ie) {
e6b7cde4	64	new_chan_no = elems->ch_switch_ie->new_ch_num;
c0f17eb9 CYY	65	csa_ie->count = elems->ch_switch_ie->count;
c0f17eb9 CYY	66	csa_ie->mode = elems->ch_switch_ie->mode;
e6b7cde4 SW	67	} else {
	68	/* nothing here we understand */
	69	return 1;
	70	}
	71
33a45867 CYY	72	/* Mesh Channel Switch Parameters Element */
	73	if (elems->mesh_chansw_params_ie) {
	74	csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
	75	csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
3f718fd8 CYY	76	csa_ie->pre_value = le16_to_cpu(
3f718fd8 CYY	77	elems->mesh_chansw_params_ie->mesh_pre_value);
5d55371b BB	78
	79	if (elems->mesh_chansw_params_ie->mesh_flags &
	80	WLAN_EID_CHAN_SWITCH_PARAM_REASON)
	81	csa_ie->reason_code = le16_to_cpu(
	82	elems->mesh_chansw_params_ie->mesh_reason);
33a45867 CYY	83	}
33a45867 CYY	84
e6b7cde4 SW	85	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
	86	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	87	if (!new_chan \|\| new_chan->flags & IEEE80211_CHAN_DISABLED) {
	88	sdata_info(sdata,
	89	"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
	90	bssid, new_freq);
	91	return -EINVAL;
	92	}
	93
84469a45	94	if (sec_chan_offs) {
e6b7cde4	95	secondary_channel_offset = sec_chan_offs->sec_chan_offs;
ba323e29	96	} else if (!(conn_flags & IEEE80211_CONN_DISABLE_HT)) {
84469a45 LC	97	/* If the secondary channel offset IE is not present,
	98	* we can't know what's the post-CSA offset, so the
	99	* best we can do is use 20MHz.
	100	*/
e6b7cde4 SW	101	secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
	102	}
	103
	104	switch (secondary_channel_offset) {
	105	default:
	106	/* secondary_channel_offset was present but is invalid */
	107	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
c0f17eb9	108	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	109	NL80211_CHAN_HT20);
	110	break;
	111	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
c0f17eb9	112	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	113	NL80211_CHAN_HT40PLUS);
	114	break;
	115	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
c0f17eb9	116	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	117	NL80211_CHAN_HT40MINUS);
	118	break;
	119	case -1:
c0f17eb9	120	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	121	NL80211_CHAN_NO_HT);
	122	/* keep width for 5/10 MHz channels */
	123	switch (sdata->vif.bss_conf.chandef.width) {
	124	case NL80211_CHAN_WIDTH_5:
	125	case NL80211_CHAN_WIDTH_10:
c0f17eb9 CYY	126	csa_ie->chandef.width =
c0f17eb9 CYY	127	sdata->vif.bss_conf.chandef.width;
e6b7cde4 SW	128	break;
	129	default:
	130	break;
	131	}
	132	break;
	133	}
	134
	135	if (wide_bw_chansw_ie) {
dcf3c8fb	136	u8 new_seg1 = wide_bw_chansw_ie->new_center_freq_seg1;
92b3a28a JB	137	struct ieee80211_vht_operation vht_oper = {
	138	.chan_width =
	139	wide_bw_chansw_ie->new_channel_width,
2fb51c35	140	.center_freq_seg0_idx =
e6b7cde4	141	wide_bw_chansw_ie->new_center_freq_seg0,
dcf3c8fb	142	.center_freq_seg1_idx = new_seg1,
92b3a28a JB	143	/* .basic_mcs_set doesn't matter */
92b3a28a JB	144	};
dcf3c8fb SB	145	struct ieee80211_ht_operation ht_oper = {
	146	.operation_mode =
	147	cpu_to_le16(new_seg1 <<
	148	IEEE80211_HT_OP_MODE_CCFS2_SHIFT),
	149	};
e6b7cde4	150
92b3a28a JB	151	/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
	152	* to the previously parsed chandef
	153	*/
	154	new_vht_chandef = csa_ie->chandef;
	155
	156	/* ignore if parsing fails */
7eb26df2	157	if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
2a333a0d	158	vht_cap_info,
7eb26df2 JB	159	&vht_oper, &ht_oper,
7eb26df2 JB	160	&new_vht_chandef))
e6b7cde4	161	new_vht_chandef.chan = NULL;
92b3a28a	162
ba323e29	163	if (conn_flags & IEEE80211_CONN_DISABLE_80P80MHZ &&
e6b7cde4 SW	164	new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
e6b7cde4 SW	165	ieee80211_chandef_downgrade(&new_vht_chandef);
ba323e29	166	if (conn_flags & IEEE80211_CONN_DISABLE_160MHZ &&
e6b7cde4 SW	167	new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
e6b7cde4 SW	168	ieee80211_chandef_downgrade(&new_vht_chandef);
e6b7cde4 SW	169	}
	170
	171	/* if VHT data is there validate & use it */
	172	if (new_vht_chandef.chan) {
	173	if (!cfg80211_chandef_compatible(&new_vht_chandef,
c0f17eb9	174	&csa_ie->chandef)) {
e6b7cde4 SW	175	sdata_info(sdata,
	176	"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
	177	bssid);
	178	return -EINVAL;
	179	}
c0f17eb9	180	csa_ie->chandef = new_vht_chandef;
e6b7cde4 SW	181	}
e6b7cde4 SW	182
ee145775 SS	183	if (elems->max_channel_switch_time)
	184	csa_ie->max_switch_time =
	185	(elems->max_channel_switch_time[0] << 0) \|
	186	(elems->max_channel_switch_time[1] << 8) \|
	187	(elems->max_channel_switch_time[2] << 16);
	188
e6b7cde4 SW	189	return 0;
	190	}
	191
39192c0b JB	192	static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
	193	struct ieee80211_msrment_ie *request_ie,
	194	const u8 da, const u8 bssid,
	195	u8 dialog_token)
	196	{
	197	struct ieee80211_local *local = sdata->local;
	198	struct sk_buff *skb;
	199	struct ieee80211_mgmt *msr_report;
	200
	201	skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
	202	sizeof(struct ieee80211_msrment_ie));
d15b8459	203	if (!skb)
39192c0b	204	return;
39192c0b JB	205
39192c0b JB	206	skb_reserve(skb, local->hw.extra_tx_headroom);
b080db58	207	msr_report = skb_put_zero(skb, 24);
39192c0b	208	memcpy(msr_report->da, da, ETH_ALEN);
47846c9b	209	memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
39192c0b JB	210	memcpy(msr_report->bssid, bssid, ETH_ALEN);
	211	msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	212	IEEE80211_STYPE_ACTION);
	213
	214	skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
	215	msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
	216	msr_report->u.action.u.measurement.action_code =
	217	WLAN_ACTION_SPCT_MSR_RPRT;
	218	msr_report->u.action.u.measurement.dialog_token = dialog_token;
	219
	220	msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
	221	msr_report->u.action.u.measurement.length =
	222	sizeof(struct ieee80211_msrment_ie);
	223
	224	memset(&msr_report->u.action.u.measurement.msr_elem, 0,
	225	sizeof(struct ieee80211_msrment_ie));
	226	msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
	227	msr_report->u.action.u.measurement.msr_elem.mode \|=
	228	IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
	229	msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
	230
62ae67be	231	ieee80211_tx_skb(sdata, skb);
39192c0b JB	232	}
	233
	234	void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
	235	struct ieee80211_mgmt *mgmt,
	236	size_t len)
	237	{
	238	/*
	239	* Ignoring measurement request is spec violation.
	240	* Mandatory measurements must be reported optional
	241	* measurements might be refused or reported incapable
	242	* For now just refuse
	243	* TODO: Answer basic measurement as unmeasured
	244	*/
	245	ieee80211_send_refuse_measurement_request(sdata,
	246	&mgmt->u.action.u.measurement.msr_elem,
	247	mgmt->sa, mgmt->bssid,
	248	mgmt->u.action.u.measurement.dialog_token);
	249	}