net/mac80211/spectmgmt.c - kernel/bruno - Git at Google

 /*
  * 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>
  *
  * 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 ieee80211_band current_band,
 				 u32 sta_flags, u8 *bssid,
 				 struct ieee80211_csa_ie *csa_ie)
 {
 	enum ieee80211_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;

 	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);
 	}

 	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) {
 		new_vht_chandef.chan = new_chan;
 		new_vht_chandef.center_freq1 =
 			ieee80211_channel_to_frequency(
 				wide_bw_chansw_ie->new_center_freq_seg0,
 				new_band);

 		switch (wide_bw_chansw_ie->new_channel_width) {
 		default:
 			/* hmmm, ignore VHT and use HT if present */
 		case IEEE80211_VHT_CHANWIDTH_USE_HT:
 			new_vht_chandef.chan = NULL;
 			break;
 		case IEEE80211_VHT_CHANWIDTH_80MHZ:
 			new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
 			break;
 		case IEEE80211_VHT_CHANWIDTH_160MHZ:
 			new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
 			break;
 		case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
 			/* field is otherwise reserved */
 			new_vht_chandef.center_freq2 =
 				ieee80211_channel_to_frequency(
 					wide_bw_chansw_ie->new_center_freq_seg1,
 					new_band);
 			new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
 			break;
 		}
 		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 (sta_flags & IEEE80211_STA_DISABLE_40MHZ &&
 		    new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
 			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 = (struct ieee80211_mgmt *)skb_put(skb, 24);
 	memset(msr_report, 0, 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);
 }
	/*
	* 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>
	*
	* 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 ieee80211_band current_band,
	u32 sta_flags, u8 *bssid,
	struct ieee80211_csa_ie *csa_ie)
	{
	enum ieee80211_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;

	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);
	}

	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) {
	new_vht_chandef.chan = new_chan;
	new_vht_chandef.center_freq1 =
	ieee80211_channel_to_frequency(
	wide_bw_chansw_ie->new_center_freq_seg0,
	new_band);

	switch (wide_bw_chansw_ie->new_channel_width) {
	default:
	/* hmmm, ignore VHT and use HT if present */
	case IEEE80211_VHT_CHANWIDTH_USE_HT:
	new_vht_chandef.chan = NULL;
	break;
	case IEEE80211_VHT_CHANWIDTH_80MHZ:
	new_vht_chandef.width = NL80211_CHAN_WIDTH_80;
	break;
	case IEEE80211_VHT_CHANWIDTH_160MHZ:
	new_vht_chandef.width = NL80211_CHAN_WIDTH_160;
	break;
	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
	/* field is otherwise reserved */
	new_vht_chandef.center_freq2 =
	ieee80211_channel_to_frequency(
	wide_bw_chansw_ie->new_center_freq_seg1,
	new_band);
	new_vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
	break;
	}
	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 (sta_flags & IEEE80211_STA_DISABLE_40MHZ &&
	new_vht_chandef.width > NL80211_CHAN_WIDTH_20)
	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 = (struct ieee80211_mgmt *)skb_put(skb, 24);
	memset(msr_report, 0, 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);
	}