[linux-2.6-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        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 sta_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 (sta_flags & (IEEE80211_STA_DISABLE_HT |
			 IEEE80211_STA_DISABLE_40MHZ)) {
		sec_chan_offs = NULL;
		wide_bw_chansw_ie = NULL;
	}

	if (sta_flags & IEEE80211_STA_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 (!(sta_flags & IEEE80211_STA_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) {
		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 =
				wide_bw_chansw_ie->new_center_freq_seg1,
			/* .basic_mcs_set doesn't matter */
		};
		struct ieee80211_ht_operation ht_oper = {};

		/* 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_oper, &ht_oper,
						&new_vht_chandef))
			new_vht_chandef.chan = NULL;

		if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
		    new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
			ieee80211_chandef_downgrade(&new_vht_chandef);
		if (sta_flags & IEEE80211_STA_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>
191da271	12	* Copyright (C) 2018 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,
c0f17eb9 CYY	25	u32 sta_flags, u8 *bssid,
c0f17eb9 CYY	26	struct ieee80211_csa_ie *csa_ie)
e6b7cde4	27	{
191da271	28	enum nl80211_band new_band = current_band;
e6b7cde4 SW	29	int new_freq;
	30	u8 new_chan_no;
	31	struct ieee80211_channel *new_chan;
	32	struct cfg80211_chan_def new_vht_chandef = {};
	33	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
	34	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
e6b7cde4 SW	35	int secondary_channel_offset = -1;
e6b7cde4 SW	36
61b81b40 JB	37	memset(csa_ie, 0, sizeof(*csa_ie));
61b81b40 JB	38
e6b7cde4 SW	39	sec_chan_offs = elems->sec_chan_offs;
e6b7cde4 SW	40	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
e6b7cde4 SW	41
	42	if (sta_flags & (IEEE80211_STA_DISABLE_HT \|
	43	IEEE80211_STA_DISABLE_40MHZ)) {
	44	sec_chan_offs = NULL;
	45	wide_bw_chansw_ie = NULL;
e6b7cde4 SW	46	}
	47
	48	if (sta_flags & IEEE80211_STA_DISABLE_VHT)
	49	wide_bw_chansw_ie = NULL;
	50
	51	if (elems->ext_chansw_ie) {
	52	if (!ieee80211_operating_class_to_band(
	53	elems->ext_chansw_ie->new_operating_class,
	54	&new_band)) {
	55	sdata_info(sdata,
191da271	56	"cannot understand ECSA IE operating class, %d, ignoring\n",
e6b7cde4	57	elems->ext_chansw_ie->new_operating_class);
e6b7cde4 SW	58	}
e6b7cde4 SW	59	new_chan_no = elems->ext_chansw_ie->new_ch_num;
c0f17eb9 CYY	60	csa_ie->count = elems->ext_chansw_ie->count;
c0f17eb9 CYY	61	csa_ie->mode = elems->ext_chansw_ie->mode;
e6b7cde4	62	} else if (elems->ch_switch_ie) {
e6b7cde4	63	new_chan_no = elems->ch_switch_ie->new_ch_num;
c0f17eb9 CYY	64	csa_ie->count = elems->ch_switch_ie->count;
c0f17eb9 CYY	65	csa_ie->mode = elems->ch_switch_ie->mode;
e6b7cde4 SW	66	} else {
	67	/* nothing here we understand */
	68	return 1;
	69	}
	70
33a45867 CYY	71	/* Mesh Channel Switch Parameters Element */
	72	if (elems->mesh_chansw_params_ie) {
	73	csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
	74	csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
3f718fd8 CYY	75	csa_ie->pre_value = le16_to_cpu(
3f718fd8 CYY	76	elems->mesh_chansw_params_ie->mesh_pre_value);
5d55371b BB	77
	78	if (elems->mesh_chansw_params_ie->mesh_flags &
	79	WLAN_EID_CHAN_SWITCH_PARAM_REASON)
	80	csa_ie->reason_code = le16_to_cpu(
	81	elems->mesh_chansw_params_ie->mesh_reason);
33a45867 CYY	82	}
33a45867 CYY	83
e6b7cde4 SW	84	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
	85	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	86	if (!new_chan \|\| new_chan->flags & IEEE80211_CHAN_DISABLED) {
	87	sdata_info(sdata,
	88	"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
	89	bssid, new_freq);
	90	return -EINVAL;
	91	}
	92
84469a45	93	if (sec_chan_offs) {
e6b7cde4	94	secondary_channel_offset = sec_chan_offs->sec_chan_offs;
e6b7cde4	95	} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
84469a45 LC	96	/* If the secondary channel offset IE is not present,
	97	* we can't know what's the post-CSA offset, so the
	98	* best we can do is use 20MHz.
	99	*/
e6b7cde4 SW	100	secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
	101	}
	102
	103	switch (secondary_channel_offset) {
	104	default:
	105	/* secondary_channel_offset was present but is invalid */
	106	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
c0f17eb9	107	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	108	NL80211_CHAN_HT20);
	109	break;
	110	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
c0f17eb9	111	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	112	NL80211_CHAN_HT40PLUS);
	113	break;
	114	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
c0f17eb9	115	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	116	NL80211_CHAN_HT40MINUS);
	117	break;
	118	case -1:
c0f17eb9	119	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	120	NL80211_CHAN_NO_HT);
	121	/* keep width for 5/10 MHz channels */
	122	switch (sdata->vif.bss_conf.chandef.width) {
	123	case NL80211_CHAN_WIDTH_5:
	124	case NL80211_CHAN_WIDTH_10:
c0f17eb9 CYY	125	csa_ie->chandef.width =
c0f17eb9 CYY	126	sdata->vif.bss_conf.chandef.width;
e6b7cde4 SW	127	break;
	128	default:
	129	break;
	130	}
	131	break;
	132	}
	133
	134	if (wide_bw_chansw_ie) {
92b3a28a JB	135	struct ieee80211_vht_operation vht_oper = {
	136	.chan_width =
	137	wide_bw_chansw_ie->new_channel_width,
2fb51c35	138	.center_freq_seg0_idx =
e6b7cde4	139	wide_bw_chansw_ie->new_center_freq_seg0,
2fb51c35	140	.center_freq_seg1_idx =
92b3a28a JB	141	wide_bw_chansw_ie->new_center_freq_seg1,
	142	/* .basic_mcs_set doesn't matter */
	143	};
7eb26df2	144	struct ieee80211_ht_operation ht_oper = {};
e6b7cde4	145
92b3a28a JB	146	/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
	147	* to the previously parsed chandef
	148	*/
	149	new_vht_chandef = csa_ie->chandef;
	150
	151	/* ignore if parsing fails */
7eb26df2 JB	152	if (!ieee80211_chandef_vht_oper(&sdata->local->hw,
	153	&vht_oper, &ht_oper,
	154	&new_vht_chandef))
e6b7cde4	155	new_vht_chandef.chan = NULL;
92b3a28a	156
e6b7cde4 SW	157	if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
	158	new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
	159	ieee80211_chandef_downgrade(&new_vht_chandef);
	160	if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
	161	new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
	162	ieee80211_chandef_downgrade(&new_vht_chandef);
e6b7cde4 SW	163	}
	164
	165	/* if VHT data is there validate & use it */
	166	if (new_vht_chandef.chan) {
	167	if (!cfg80211_chandef_compatible(&new_vht_chandef,
c0f17eb9	168	&csa_ie->chandef)) {
e6b7cde4 SW	169	sdata_info(sdata,
	170	"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
	171	bssid);
	172	return -EINVAL;
	173	}
c0f17eb9	174	csa_ie->chandef = new_vht_chandef;
e6b7cde4 SW	175	}
e6b7cde4 SW	176
ee145775 SS	177	if (elems->max_channel_switch_time)
	178	csa_ie->max_switch_time =
	179	(elems->max_channel_switch_time[0] << 0) \|
	180	(elems->max_channel_switch_time[1] << 8) \|
	181	(elems->max_channel_switch_time[2] << 16);
	182
e6b7cde4 SW	183	return 0;
	184	}
	185
39192c0b JB	186	static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
	187	struct ieee80211_msrment_ie *request_ie,
	188	const u8 da, const u8 bssid,
	189	u8 dialog_token)
	190	{
	191	struct ieee80211_local *local = sdata->local;
	192	struct sk_buff *skb;
	193	struct ieee80211_mgmt *msr_report;
	194
	195	skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
	196	sizeof(struct ieee80211_msrment_ie));
d15b8459	197	if (!skb)
39192c0b	198	return;
39192c0b JB	199
39192c0b JB	200	skb_reserve(skb, local->hw.extra_tx_headroom);
b080db58	201	msr_report = skb_put_zero(skb, 24);
39192c0b	202	memcpy(msr_report->da, da, ETH_ALEN);
47846c9b	203	memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
39192c0b JB	204	memcpy(msr_report->bssid, bssid, ETH_ALEN);
	205	msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	206	IEEE80211_STYPE_ACTION);
	207
	208	skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
	209	msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
	210	msr_report->u.action.u.measurement.action_code =
	211	WLAN_ACTION_SPCT_MSR_RPRT;
	212	msr_report->u.action.u.measurement.dialog_token = dialog_token;
	213
	214	msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
	215	msr_report->u.action.u.measurement.length =
	216	sizeof(struct ieee80211_msrment_ie);
	217
	218	memset(&msr_report->u.action.u.measurement.msr_elem, 0,
	219	sizeof(struct ieee80211_msrment_ie));
	220	msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
	221	msr_report->u.action.u.measurement.msr_elem.mode \|=
	222	IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
	223	msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
	224
62ae67be	225	ieee80211_tx_skb(sdata, skb);
39192c0b JB	226	}
	227
	228	void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
	229	struct ieee80211_mgmt *mgmt,
	230	size_t len)
	231	{
	232	/*
	233	* Ignoring measurement request is spec violation.
	234	* Mandatory measurements must be reported optional
	235	* measurements might be refused or reported incapable
	236	* For now just refuse
	237	* TODO: Answer basic measurement as unmeasured
	238	*/
	239	ieee80211_send_refuse_measurement_request(sdata,
	240	&mgmt->u.action.u.measurement.msr_elem,
	241	mgmt->sa, mgmt->bssid,
	242	mgmt->u.action.u.measurement.dialog_token);
	243	}