Release 4.14 net/wireless/chan.c

// SPDX-License-Identifier: GPL-2.0
/*
 * This file contains helper code to handle channel
 * settings and keeping track of what is possible at
 * any point in time.
 *
 * Copyright 2009       Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 */

#include <linux/export.h>
#include <net/cfg80211.h>
#include "core.h"
#include "rdev-ops.h"



void cfg80211_chandef_create(struct cfg80211_chan_def *chandef,
			     struct ieee80211_channel *chan,
			     enum nl80211_channel_type chan_type)
{
	if (WARN_ON(!chan))
		return;

	chandef->chan = chan;
	chandef->center_freq2 = 0;

	switch (chan_type) {
	case NL80211_CHAN_NO_HT:
		chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
		chandef->center_freq1 = chan->center_freq;
		break;
	case NL80211_CHAN_HT20:
		chandef->width = NL80211_CHAN_WIDTH_20;
		chandef->center_freq1 = chan->center_freq;
		break;
	case NL80211_CHAN_HT40PLUS:
		chandef->width = NL80211_CHAN_WIDTH_40;
		chandef->center_freq1 = chan->center_freq + 10;
		break;
	case NL80211_CHAN_HT40MINUS:
		chandef->width = NL80211_CHAN_WIDTH_40;
		chandef->center_freq1 = chan->center_freq - 10;
		break;
	default:
		WARN_ON(1);
	}
}
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EXPORT_SYMBOL(cfg80211_chandef_create);



bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
{
	u32 control_freq;

	if (!chandef->chan)
		return false;

	control_freq = chandef->chan->center_freq;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_5:
	case NL80211_CHAN_WIDTH_10:
	case NL80211_CHAN_WIDTH_20:
	case NL80211_CHAN_WIDTH_20_NOHT:
		if (chandef->center_freq1 != control_freq)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	case NL80211_CHAN_WIDTH_40:
		if (chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	case NL80211_CHAN_WIDTH_80P80:
		if (chandef->center_freq1 != control_freq + 30 &&
		    chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10 &&
		    chandef->center_freq1 != control_freq - 30)
			return false;
		if (!chandef->center_freq2)
			return false;
		/* adjacent is not allowed -- that's a 160 MHz channel */
		if (chandef->center_freq1 - chandef->center_freq2 == 80 ||
		    chandef->center_freq2 - chandef->center_freq1 == 80)
			return false;
		break;
	case NL80211_CHAN_WIDTH_80:
		if (chandef->center_freq1 != control_freq + 30 &&
		    chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10 &&
		    chandef->center_freq1 != control_freq - 30)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	case NL80211_CHAN_WIDTH_160:
		if (chandef->center_freq1 != control_freq + 70 &&
		    chandef->center_freq1 != control_freq + 50 &&
		    chandef->center_freq1 != control_freq + 30 &&
		    chandef->center_freq1 != control_freq + 10 &&
		    chandef->center_freq1 != control_freq - 10 &&
		    chandef->center_freq1 != control_freq - 30 &&
		    chandef->center_freq1 != control_freq - 50 &&
		    chandef->center_freq1 != control_freq - 70)
			return false;
		if (chandef->center_freq2)
			return false;
		break;
	default:
		return false;
	}

	return true;
}
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EXPORT_SYMBOL(cfg80211_chandef_valid);



static void chandef_primary_freqs(const struct cfg80211_chan_def *c,
				  u32 *pri40, u32 *pri80)
{
	int tmp;

	switch (c->width) {
	case NL80211_CHAN_WIDTH_40:
		*pri40 = c->center_freq1;
		*pri80 = 0;
		break;
	case NL80211_CHAN_WIDTH_80:
	case NL80211_CHAN_WIDTH_80P80:
		*pri80 = c->center_freq1;
		/* n_P20 */
		tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
		/* n_P40 */
		tmp /= 2;
		/* freq_P40 */
		*pri40 = c->center_freq1 - 20 + 40 * tmp;
		break;
	case NL80211_CHAN_WIDTH_160:
		/* n_P20 */
		tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
		/* n_P40 */
		tmp /= 2;
		/* freq_P40 */
		*pri40 = c->center_freq1 - 60 + 40 * tmp;
		/* n_P80 */
		tmp /= 2;
		*pri80 = c->center_freq1 - 40 + 80 * tmp;
		break;
	default:
		WARN_ON_ONCE(1);
	}
}

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static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
{
	int width;

	switch (c->width) {
	case NL80211_CHAN_WIDTH_5:
		width = 5;
		break;
	case NL80211_CHAN_WIDTH_10:
		width = 10;
		break;
	case NL80211_CHAN_WIDTH_20:
	case NL80211_CHAN_WIDTH_20_NOHT:
		width = 20;
		break;
	case NL80211_CHAN_WIDTH_40:
		width = 40;
		break;
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_80:
		width = 80;
		break;
	case NL80211_CHAN_WIDTH_160:
		width = 160;
		break;
	default:
		WARN_ON_ONCE(1);
		return -1;
	}
	return width;
}

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const struct cfg80211_chan_def *

cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
			    const struct cfg80211_chan_def *c2)
{
	u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80;

	/* If they are identical, return */
	if (cfg80211_chandef_identical(c1, c2))
		return c1;

	/* otherwise, must have same control channel */
	if (c1->chan != c2->chan)
		return NULL;

	/*
         * If they have the same width, but aren't identical,
         * then they can't be compatible.
         */
	if (c1->width == c2->width)
		return NULL;

	/*
         * can't be compatible if one of them is 5 or 10 MHz,
         * but they don't have the same width.
         */
	if (c1->width == NL80211_CHAN_WIDTH_5 ||
	    c1->width == NL80211_CHAN_WIDTH_10 ||
	    c2->width == NL80211_CHAN_WIDTH_5 ||
	    c2->width == NL80211_CHAN_WIDTH_10)
		return NULL;

	if (c1->width == NL80211_CHAN_WIDTH_20_NOHT ||
	    c1->width == NL80211_CHAN_WIDTH_20)
		return c2;

	if (c2->width == NL80211_CHAN_WIDTH_20_NOHT ||
	    c2->width == NL80211_CHAN_WIDTH_20)
		return c1;

	chandef_primary_freqs(c1, &c1_pri40, &c1_pri80);
	chandef_primary_freqs(c2, &c2_pri40, &c2_pri80);

	if (c1_pri40 != c2_pri40)
		return NULL;

	WARN_ON(!c1_pri80 && !c2_pri80);
	if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80)
		return NULL;

	if (c1->width > c2->width)
		return c1;
	return c2;
}
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EXPORT_SYMBOL(cfg80211_chandef_compatible);



static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq,
					 u32 bandwidth,
					 enum nl80211_dfs_state dfs_state)
{
	struct ieee80211_channel *c;
	u32 freq;

	for (freq = center_freq - bandwidth/2 + 10;
	     freq <= center_freq + bandwidth/2 - 10;
	     freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
			continue;

		c->dfs_state = dfs_state;
		c->dfs_state_entered = jiffies;
	}
}

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void cfg80211_set_dfs_state(struct wiphy *wiphy,
			    const struct cfg80211_chan_def *chandef,
			    enum nl80211_dfs_state dfs_state)
{
	int width;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return;

	cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1,
				     width, dfs_state);

	if (!chandef->center_freq2)
		return;
	cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2,
				     width, dfs_state);
}

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static u32 cfg80211_get_start_freq(u32 center_freq,
				   u32 bandwidth)
{
	u32 start_freq;

	if (bandwidth <= 20)
		start_freq = center_freq;
	else
		start_freq = center_freq - bandwidth/2 + 10;

	return start_freq;
}

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static u32 cfg80211_get_end_freq(u32 center_freq,
				 u32 bandwidth)
{
	u32 end_freq;

	if (bandwidth <= 20)
		end_freq = center_freq;
	else
		end_freq = center_freq + bandwidth/2 - 10;

	return end_freq;
}

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static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
					    u32 center_freq,
					    u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return -EINVAL;

		if (c->flags & IEEE80211_CHAN_RADAR)
			return 1;
	}
	return 0;
}


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int cfg80211_chandef_dfs_required(struct wiphy *wiphy,
				  const struct cfg80211_chan_def *chandef,
				  enum nl80211_iftype iftype)
{
	int width;
	int ret;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return -EINVAL;

	switch (iftype) {
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
	case NL80211_IFTYPE_MESH_POINT:
		width = cfg80211_chandef_get_width(chandef);
		if (width < 0)
			return -EINVAL;

		ret = cfg80211_get_chans_dfs_required(wiphy,
						      chandef->center_freq1,
						      width);
		if (ret < 0)
			return ret;
		else if (ret > 0)
			return BIT(chandef->width);

		if (!chandef->center_freq2)
			return 0;

		ret = cfg80211_get_chans_dfs_required(wiphy,
						      chandef->center_freq2,
						      width);
		if (ret < 0)
			return ret;
		else if (ret > 0)
			return BIT(chandef->width);

		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_OCB:
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_P2P_DEVICE:
	case NL80211_IFTYPE_NAN:
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
	case NUM_NL80211_IFTYPES:
		WARN_ON(1);
	}

	return 0;
}
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EXPORT_SYMBOL(cfg80211_chandef_dfs_required);



static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy,
					 u32 center_freq,
					 u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;
	int count = 0;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	/*
         * Check entire range of channels for the bandwidth.
         * Check all channels are DFS channels (DFS_USABLE or
         * DFS_AVAILABLE). Return number of usable channels
         * (require CAC). Allow DFS and non-DFS channel mix.
         */
	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return -EINVAL;

		if (c->flags & IEEE80211_CHAN_DISABLED)
			return -EINVAL;

		if (c->flags & IEEE80211_CHAN_RADAR) {
			if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
				return -EINVAL;

			if (c->dfs_state == NL80211_DFS_USABLE)
				count++;
		}
	}

	return count;
}

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bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
				 const struct cfg80211_chan_def *chandef)
{
	int width;
	int r1, r2 = 0;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return false;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return false;

	r1 = cfg80211_get_chans_dfs_usable(wiphy, chandef->center_freq1,
					  width);

	if (r1 < 0)
		return false;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_80P80:
		WARN_ON(!chandef->center_freq2);
		r2 = cfg80211_get_chans_dfs_usable(wiphy,
						   chandef->center_freq2,
						   width);
		if (r2 < 0)
			return false;
		break;
	default:
		WARN_ON(chandef->center_freq2);
		break;
	}

	return (r1 + r2 > 0);
}

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/*
 * Checks if center frequency of chan falls with in the bandwidth
 * range of chandef.
 */


bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef,
			  struct ieee80211_channel *chan)
{
	int width;
	u32 cf_offset, freq;

	if (chandef->chan->center_freq == chan->center_freq)
		return true;

	width = cfg80211_chandef_get_width(chandef);
	if (width <= 20)
		return false;

	cf_offset = width / 2 - 10;

	for (freq = chandef->center_freq1 - width / 2 + 10;
	     freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) {
		if (chan->center_freq == freq)
			return true;
	}

	if (!chandef->center_freq2)
		return false;

	for (freq = chandef->center_freq2 - width / 2 + 10;
	     freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) {
		if (chan->center_freq == freq)
			return true;
	}

	return false;
}

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bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
{
	bool active = false;

	ASSERT_WDEV_LOCK(wdev);

	if (!wdev->chandef.chan)
		return false;

	switch (wdev->iftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_P2P_GO:
		active = wdev->beacon_interval != 0;
		break;
	case NL80211_IFTYPE_ADHOC:
		active = wdev->ssid_len != 0;
		break;
	case NL80211_IFTYPE_MESH_POINT:
		active = wdev->mesh_id_len != 0;
		break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_OCB:
	case NL80211_IFTYPE_P2P_CLIENT:
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_AP_VLAN:
	case NL80211_IFTYPE_WDS:
	case NL80211_IFTYPE_P2P_DEVICE:
	/* Can NAN type be considered as beaconing interface? */
	case NL80211_IFTYPE_NAN:
		break;
	case NL80211_IFTYPE_UNSPECIFIED:
	case NUM_NL80211_IFTYPES:
		WARN_ON(1);
	}

	return active;
}

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static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
					struct ieee80211_channel *chan)
{
	struct wireless_dev *wdev;

	list_for_each_entry(wdev, &wiphy->wdev_list, list) {
		wdev_lock(wdev);
		if (!cfg80211_beaconing_iface_active(wdev)) {
			wdev_unlock(wdev);
			continue;
		}

		if (cfg80211_is_sub_chan(&wdev->chandef, chan)) {
			wdev_unlock(wdev);
			return true;
		}
		wdev_unlock(wdev);
	}

	return false;
}

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bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy,
				  struct ieee80211_channel *chan)
{
	struct cfg80211_registered_device *rdev;

	ASSERT_RTNL();

	if (!(chan->flags & IEEE80211_CHAN_RADAR))
		return false;

	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
			continue;

		if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan))
			return true;
	}

	return false;
}

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static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy,
					     u32 center_freq,
					     u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	/*
         * Check entire range of channels for the bandwidth.
         * If any channel in between is disabled or has not
         * had gone through CAC return false
         */
	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return false;

		if (c->flags & IEEE80211_CHAN_DISABLED)
			return false;

		if ((c->flags & IEEE80211_CHAN_RADAR)  &&
		    (c->dfs_state != NL80211_DFS_AVAILABLE))
			return false;
	}

	return true;
}

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static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
				const struct cfg80211_chan_def *chandef)
{
	int width;
	int r;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return false;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return false;

	r = cfg80211_get_chans_dfs_available(wiphy, chandef->center_freq1,
					     width);

	/* If any of channels unavailable for cf1 just return */
	if (!r)
		return r;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_80P80:
		WARN_ON(!chandef->center_freq2);
		r = cfg80211_get_chans_dfs_available(wiphy,
						     chandef->center_freq2,
						     width);
		break;
	default:
		WARN_ON(chandef->center_freq2);
		break;
	}

	return r;
}

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Janusz Dziedzic
117
97.50%
1
33.33%
Simon Wunderlich
2
1.67%
1
33.33%
Colin Ian King
1
0.83%
1
33.33%
Total
120
100.00%
3
100.00%



static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
						    u32 center_freq,
						    u32 bandwidth)
{
	struct ieee80211_channel *c;
	u32 start_freq, end_freq, freq;
	unsigned int dfs_cac_ms = 0;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c)
			return 0;

		if (c->flags & IEEE80211_CHAN_DISABLED)
			return 0;

		if (!(c->flags & IEEE80211_CHAN_RADAR))
			continue;

		if (c->dfs_cac_ms > dfs_cac_ms)
			dfs_cac_ms = c->dfs_cac_ms;
	}

	return dfs_cac_ms;
}

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Janusz Dziedzic
127
100.00%
1
100.00%
Total
127
100.00%
1
100.00%


unsigned int

cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
			      const struct cfg80211_chan_def *chandef)
{
	int width;
	unsigned int t1 = 0, t2 = 0;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return 0;

	width = cfg80211_chandef_get_width(chandef);
	if (width < 0)
		return 0;

	t1 = cfg80211_get_chans_dfs_cac_time(wiphy,
					     chandef->center_freq1,
					     width);

	if (!chandef->center_freq2)
		return t1;

	t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
					     chandef->center_freq2,
					     width);

	return max(t1, t2);
}

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Janusz Dziedzic
104
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1
100.00%
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104
100.00%
1
100.00%



static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
					u32 center_freq, u32 bandwidth,
					u32 prohibited_flags)
{
	struct ieee80211_channel *c;
	u32 freq, start_freq, end_freq;

	start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
	end_freq = cfg80211_get_end_freq(center_freq, bandwidth);

	for (freq = start_freq; freq <= end_freq; freq += 20) {
		c = ieee80211_get_channel(wiphy, freq);
		if (!c || c->flags & prohibited_flags)
			return false;
	}

	return true;
}

Contributors
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Tokens
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CommitProp
Janusz Dziedzic
78
84.78%
1
50.00%
Johannes Berg
14
15.22%
1
50.00%
Total
92
100.00%
2
100.00%



bool cfg80211_chandef_usable(struct wiphy *wiphy,
			     const struct cfg80211_chan_def *chandef,
			     u32 prohibited_flags)
{
	struct ieee80211_sta_ht_cap *ht_cap;
	struct ieee80211_sta_vht_cap *vht_cap;
	u32 width, control_freq, cap;

	if (WARN_ON(!cfg80211_chandef_valid(chandef)))
		return false;

	ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap;
	vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap;

	control_freq = chandef->chan->center_freq;

	switch (chandef->width) {
	case NL80211_CHAN_WIDTH_5:
		width = 5;
		break;
	case NL80211_CHAN_WIDTH_10:
		prohibited_flags |= IEEE80211_CHAN_NO_10MHZ;
		width = 10;
		break;
	case NL80211_CHAN_WIDTH_20:
		if (!ht_cap->ht_supported)
			return false;
	case NL80211_CHAN_WIDTH_20_NOHT:
		prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
		width = 20;
		break;
	case NL80211_CHAN_WIDTH_40:
		width = 40;
		if (!ht_cap->ht_supported)
			return false;
		if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
		    ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT)
			return false;
		if (chandef->center_freq1 < control_freq &&
		    chandef