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

/*
 * spectrum management
 *
 * Copyright 2003, Jouni Malinen <[email protected]>
 * Copyright 2002-2005, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 * Copyright 2006-2007  Jiri Benc <[email protected]>
 * Copyright 2007, Michael Wu <[email protected]>
 * Copyright 2007-2008, Intel Corporation
 * Copyright 2008, Johannes Berg <[email protected]>
 *
 * 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.
 */

#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;
	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, disconnecting\n",
				   elems->ext_chansw_ie->new_operating_class);
			return -EINVAL;
		}
		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_band = current_band;
		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 */
		};

		/* 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(&vht_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;
	}

	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
39192c0b JB	1	/*
	2	* spectrum management
	3	*
	4	* Copyright 2003, Jouni Malinen <[email protected]>
	5	* Copyright 2002-2005, Instant802 Networks, Inc.
	6	* Copyright 2005-2006, Devicescape Software, Inc.
	7	* Copyright 2006-2007 Jiri Benc <[email protected]>
	8	* Copyright 2007, Michael Wu <[email protected]>
	9	* Copyright 2007-2008, Intel Corporation
	10	* Copyright 2008, Johannes Berg <[email protected]>
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License version 2 as
	14	* published by the Free Software Foundation.
	15	*/
	16
	17	#include <linux/ieee80211.h>
d3236553	18	#include <net/cfg80211.h>
39192c0b JB	19	#include <net/mac80211.h>
	20	#include "ieee80211_i.h"
	21	#include "sta_info.h"
	22	#include "wme.h"
	23
e6b7cde4	24	int ieee80211_parse_ch_switch_ie(struct ieee80211_sub_if_data *sdata,
84469a45	25	struct ieee802_11_elems *elems,
57fbcce3	26	enum nl80211_band current_band,
c0f17eb9 CYY	27	u32 sta_flags, u8 *bssid,
c0f17eb9 CYY	28	struct ieee80211_csa_ie *csa_ie)
e6b7cde4	29	{
57fbcce3	30	enum nl80211_band new_band;
e6b7cde4 SW	31	int new_freq;
	32	u8 new_chan_no;
	33	struct ieee80211_channel *new_chan;
	34	struct cfg80211_chan_def new_vht_chandef = {};
	35	const struct ieee80211_sec_chan_offs_ie *sec_chan_offs;
	36	const struct ieee80211_wide_bw_chansw_ie *wide_bw_chansw_ie;
e6b7cde4 SW	37	int secondary_channel_offset = -1;
e6b7cde4 SW	38
61b81b40 JB	39	memset(csa_ie, 0, sizeof(*csa_ie));
61b81b40 JB	40
e6b7cde4 SW	41	sec_chan_offs = elems->sec_chan_offs;
e6b7cde4 SW	42	wide_bw_chansw_ie = elems->wide_bw_chansw_ie;
e6b7cde4 SW	43
	44	if (sta_flags & (IEEE80211_STA_DISABLE_HT \|
	45	IEEE80211_STA_DISABLE_40MHZ)) {
	46	sec_chan_offs = NULL;
	47	wide_bw_chansw_ie = NULL;
e6b7cde4 SW	48	}
	49
	50	if (sta_flags & IEEE80211_STA_DISABLE_VHT)
	51	wide_bw_chansw_ie = NULL;
	52
	53	if (elems->ext_chansw_ie) {
	54	if (!ieee80211_operating_class_to_band(
	55	elems->ext_chansw_ie->new_operating_class,
	56	&new_band)) {
	57	sdata_info(sdata,
	58	"cannot understand ECSA IE operating class %d, disconnecting\n",
	59	elems->ext_chansw_ie->new_operating_class);
	60	return -EINVAL;
	61	}
	62	new_chan_no = elems->ext_chansw_ie->new_ch_num;
c0f17eb9 CYY	63	csa_ie->count = elems->ext_chansw_ie->count;
c0f17eb9 CYY	64	csa_ie->mode = elems->ext_chansw_ie->mode;
e6b7cde4 SW	65	} else if (elems->ch_switch_ie) {
	66	new_band = current_band;
	67	new_chan_no = elems->ch_switch_ie->new_ch_num;
c0f17eb9 CYY	68	csa_ie->count = elems->ch_switch_ie->count;
c0f17eb9 CYY	69	csa_ie->mode = elems->ch_switch_ie->mode;
e6b7cde4 SW	70	} else {
	71	/* nothing here we understand */
	72	return 1;
	73	}
	74
33a45867 CYY	75	/* Mesh Channel Switch Parameters Element */
	76	if (elems->mesh_chansw_params_ie) {
	77	csa_ie->ttl = elems->mesh_chansw_params_ie->mesh_ttl;
	78	csa_ie->mode = elems->mesh_chansw_params_ie->mesh_flags;
3f718fd8 CYY	79	csa_ie->pre_value = le16_to_cpu(
3f718fd8 CYY	80	elems->mesh_chansw_params_ie->mesh_pre_value);
5d55371b BB	81
	82	if (elems->mesh_chansw_params_ie->mesh_flags &
	83	WLAN_EID_CHAN_SWITCH_PARAM_REASON)
	84	csa_ie->reason_code = le16_to_cpu(
	85	elems->mesh_chansw_params_ie->mesh_reason);
33a45867 CYY	86	}
33a45867 CYY	87
e6b7cde4 SW	88	new_freq = ieee80211_channel_to_frequency(new_chan_no, new_band);
	89	new_chan = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	90	if (!new_chan \|\| new_chan->flags & IEEE80211_CHAN_DISABLED) {
	91	sdata_info(sdata,
	92	"BSS %pM switches to unsupported channel (%d MHz), disconnecting\n",
	93	bssid, new_freq);
	94	return -EINVAL;
	95	}
	96
84469a45	97	if (sec_chan_offs) {
e6b7cde4	98	secondary_channel_offset = sec_chan_offs->sec_chan_offs;
e6b7cde4	99	} else if (!(sta_flags & IEEE80211_STA_DISABLE_HT)) {
84469a45 LC	100	/* If the secondary channel offset IE is not present,
	101	* we can't know what's the post-CSA offset, so the
	102	* best we can do is use 20MHz.
	103	*/
e6b7cde4 SW	104	secondary_channel_offset = IEEE80211_HT_PARAM_CHA_SEC_NONE;
	105	}
	106
	107	switch (secondary_channel_offset) {
	108	default:
	109	/* secondary_channel_offset was present but is invalid */
	110	case IEEE80211_HT_PARAM_CHA_SEC_NONE:
c0f17eb9	111	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	112	NL80211_CHAN_HT20);
	113	break;
	114	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
c0f17eb9	115	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	116	NL80211_CHAN_HT40PLUS);
	117	break;
	118	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
c0f17eb9	119	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	120	NL80211_CHAN_HT40MINUS);
	121	break;
	122	case -1:
c0f17eb9	123	cfg80211_chandef_create(&csa_ie->chandef, new_chan,
e6b7cde4 SW	124	NL80211_CHAN_NO_HT);
	125	/* keep width for 5/10 MHz channels */
	126	switch (sdata->vif.bss_conf.chandef.width) {
	127	case NL80211_CHAN_WIDTH_5:
	128	case NL80211_CHAN_WIDTH_10:
c0f17eb9 CYY	129	csa_ie->chandef.width =
c0f17eb9 CYY	130	sdata->vif.bss_conf.chandef.width;
e6b7cde4 SW	131	break;
	132	default:
	133	break;
	134	}
	135	break;
	136	}
	137
	138	if (wide_bw_chansw_ie) {
92b3a28a JB	139	struct ieee80211_vht_operation vht_oper = {
	140	.chan_width =
	141	wide_bw_chansw_ie->new_channel_width,
2fb51c35	142	.center_freq_seg0_idx =
e6b7cde4	143	wide_bw_chansw_ie->new_center_freq_seg0,
2fb51c35	144	.center_freq_seg1_idx =
92b3a28a JB	145	wide_bw_chansw_ie->new_center_freq_seg1,
	146	/* .basic_mcs_set doesn't matter */
	147	};
e6b7cde4	148
92b3a28a JB	149	/* default, for the case of IEEE80211_VHT_CHANWIDTH_USE_HT,
	150	* to the previously parsed chandef
	151	*/
	152	new_vht_chandef = csa_ie->chandef;
	153
	154	/* ignore if parsing fails */
	155	if (!ieee80211_chandef_vht_oper(&vht_oper, &new_vht_chandef))
e6b7cde4	156	new_vht_chandef.chan = NULL;
92b3a28a	157
e6b7cde4 SW	158	if (sta_flags & IEEE80211_STA_DISABLE_80P80MHZ &&
	159	new_vht_chandef.width == NL80211_CHAN_WIDTH_80P80)
	160	ieee80211_chandef_downgrade(&new_vht_chandef);
	161	if (sta_flags & IEEE80211_STA_DISABLE_160MHZ &&
	162	new_vht_chandef.width == NL80211_CHAN_WIDTH_160)
	163	ieee80211_chandef_downgrade(&new_vht_chandef);
e6b7cde4 SW	164	}
	165
	166	/* if VHT data is there validate & use it */
	167	if (new_vht_chandef.chan) {
	168	if (!cfg80211_chandef_compatible(&new_vht_chandef,
c0f17eb9	169	&csa_ie->chandef)) {
e6b7cde4 SW	170	sdata_info(sdata,
	171	"BSS %pM: CSA has inconsistent channel data, disconnecting\n",
	172	bssid);
	173	return -EINVAL;
	174	}
c0f17eb9	175	csa_ie->chandef = new_vht_chandef;
e6b7cde4 SW	176	}
	177
	178	return 0;
	179	}
	180
39192c0b JB	181	static void ieee80211_send_refuse_measurement_request(struct ieee80211_sub_if_data *sdata,
	182	struct ieee80211_msrment_ie *request_ie,
	183	const u8 da, const u8 bssid,
	184	u8 dialog_token)
	185	{
	186	struct ieee80211_local *local = sdata->local;
	187	struct sk_buff *skb;
	188	struct ieee80211_mgmt *msr_report;
	189
	190	skb = dev_alloc_skb(sizeof(*msr_report) + local->hw.extra_tx_headroom +
	191	sizeof(struct ieee80211_msrment_ie));
d15b8459	192	if (!skb)
39192c0b	193	return;
39192c0b JB	194
39192c0b JB	195	skb_reserve(skb, local->hw.extra_tx_headroom);
b080db58	196	msr_report = skb_put_zero(skb, 24);
39192c0b	197	memcpy(msr_report->da, da, ETH_ALEN);
47846c9b	198	memcpy(msr_report->sa, sdata->vif.addr, ETH_ALEN);
39192c0b JB	199	memcpy(msr_report->bssid, bssid, ETH_ALEN);
	200	msr_report->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT \|
	201	IEEE80211_STYPE_ACTION);
	202
	203	skb_put(skb, 1 + sizeof(msr_report->u.action.u.measurement));
	204	msr_report->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
	205	msr_report->u.action.u.measurement.action_code =
	206	WLAN_ACTION_SPCT_MSR_RPRT;
	207	msr_report->u.action.u.measurement.dialog_token = dialog_token;
	208
	209	msr_report->u.action.u.measurement.element_id = WLAN_EID_MEASURE_REPORT;
	210	msr_report->u.action.u.measurement.length =
	211	sizeof(struct ieee80211_msrment_ie);
	212
	213	memset(&msr_report->u.action.u.measurement.msr_elem, 0,
	214	sizeof(struct ieee80211_msrment_ie));
	215	msr_report->u.action.u.measurement.msr_elem.token = request_ie->token;
	216	msr_report->u.action.u.measurement.msr_elem.mode \|=
	217	IEEE80211_SPCT_MSR_RPRT_MODE_REFUSED;
	218	msr_report->u.action.u.measurement.msr_elem.type = request_ie->type;
	219
62ae67be	220	ieee80211_tx_skb(sdata, skb);
39192c0b JB	221	}
	222
	223	void ieee80211_process_measurement_req(struct ieee80211_sub_if_data *sdata,
	224	struct ieee80211_mgmt *mgmt,
	225	size_t len)
	226	{
	227	/*
	228	* Ignoring measurement request is spec violation.
	229	* Mandatory measurements must be reported optional
	230	* measurements might be refused or reported incapable
	231	* For now just refuse
	232	* TODO: Answer basic measurement as unmeasured
	233	*/
	234	ieee80211_send_refuse_measurement_request(sdata,
	235	&mgmt->u.action.u.measurement.msr_elem,
	236	mgmt->sa, mgmt->bssid,
	237	mgmt->u.action.u.measurement.dialog_token);
	238	}