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kernel/net/wireless/chan.c
Johannes Berg b5c1622762 wifi: cfg80211: expose cfg80211_chandef_get_width() 
This can be just a trivial inline, to simplify some code.
Expose it, and also use it in util.c where it wasn't
previously available.

Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250311122534.c5c3b4af9a74.Ib25cf60f634dc359961182113214e5cdc3504e9c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2025-03-12 09:50:24 +01:00

1572 lines
39 KiB
C
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// 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
* Copyright 2018-2025 Intel Corporation
*/
#include <linux/export.h>
#include <linux/bitfield.h>
#include <net/cfg80211.h>
#include "core.h"
#include "rdev-ops.h"
static bool cfg80211_valid_60g_freq(u32 freq)
{
return freq >= 58320 && freq <= 70200;
}
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 = (struct cfg80211_chan_def) {
.chan = chan,
.freq1_offset = chan->freq_offset,
};
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);
}
}
EXPORT_SYMBOL(cfg80211_chandef_create);
static u32 cfg80211_get_start_freq(const struct cfg80211_chan_def *chandef,
u32 cf)
{
u32 start_freq, center_freq, bandwidth;
center_freq = MHZ_TO_KHZ((cf == 1) ?
chandef->center_freq1 : chandef->center_freq2);
bandwidth = MHZ_TO_KHZ(cfg80211_chandef_get_width(chandef));
if (bandwidth <= MHZ_TO_KHZ(20))
start_freq = center_freq;
else
start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10);
return start_freq;
}
static u32 cfg80211_get_end_freq(const struct cfg80211_chan_def *chandef,
u32 cf)
{
u32 end_freq, center_freq, bandwidth;
center_freq = MHZ_TO_KHZ((cf == 1) ?
chandef->center_freq1 : chandef->center_freq2);
bandwidth = MHZ_TO_KHZ(cfg80211_chandef_get_width(chandef));
if (bandwidth <= MHZ_TO_KHZ(20))
end_freq = center_freq;
else
end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
return end_freq;
}
#define for_each_subchan(chandef, freq, cf) \
for (u32 punctured = chandef->punctured, \
cf = 1, freq = cfg80211_get_start_freq(chandef, cf); \
freq <= cfg80211_get_end_freq(chandef, cf); \
freq += MHZ_TO_KHZ(20), \
((cf == 1 && chandef->center_freq2 != 0 && \
freq > cfg80211_get_end_freq(chandef, cf)) ? \
(cf++, freq = cfg80211_get_start_freq(chandef, cf), \
punctured = 0) : (punctured >>= 1))) \
if (!(punctured & 1))
struct cfg80211_per_bw_puncturing_values {
u8 len;
const u16 *valid_values;
};
static const u16 puncturing_values_80mhz[] = {
0x8, 0x4, 0x2, 0x1
};
static const u16 puncturing_values_160mhz[] = {
0x80, 0x40, 0x20, 0x10, 0x8, 0x4, 0x2, 0x1, 0xc0, 0x30, 0xc, 0x3
};
static const u16 puncturing_values_320mhz[] = {
0xc000, 0x3000, 0xc00, 0x300, 0xc0, 0x30, 0xc, 0x3, 0xf000, 0xf00,
0xf0, 0xf, 0xfc00, 0xf300, 0xf0c0, 0xf030, 0xf00c, 0xf003, 0xc00f,
0x300f, 0xc0f, 0x30f, 0xcf, 0x3f
};
#define CFG80211_PER_BW_VALID_PUNCTURING_VALUES(_bw) \
{ \
.len = ARRAY_SIZE(puncturing_values_ ## _bw ## mhz), \
.valid_values = puncturing_values_ ## _bw ## mhz \
}
static const struct cfg80211_per_bw_puncturing_values per_bw_puncturing[] = {
CFG80211_PER_BW_VALID_PUNCTURING_VALUES(80),
CFG80211_PER_BW_VALID_PUNCTURING_VALUES(160),
CFG80211_PER_BW_VALID_PUNCTURING_VALUES(320)
};
static bool valid_puncturing_bitmap(const struct cfg80211_chan_def *chandef)
{
u32 idx, i, start_freq, primary_center = chandef->chan->center_freq;
switch (chandef->width) {
case NL80211_CHAN_WIDTH_80:
idx = 0;
start_freq = chandef->center_freq1 - 40;
break;
case NL80211_CHAN_WIDTH_160:
idx = 1;
start_freq = chandef->center_freq1 - 80;
break;
case NL80211_CHAN_WIDTH_320:
idx = 2;
start_freq = chandef->center_freq1 - 160;
break;
default:
return chandef->punctured == 0;
}
if (!chandef->punctured)
return true;
/* check if primary channel is punctured */
if (chandef->punctured & (u16)BIT((primary_center - start_freq) / 20))
return false;
for (i = 0; i < per_bw_puncturing[idx].len; i++) {
if (per_bw_puncturing[idx].valid_values[i] == chandef->punctured)
return true;
}
return false;
}
static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef)
{
int max_contiguous = 0;
int num_of_enabled = 0;
int contiguous = 0;
int i;
if (!chandef->edmg.channels || !chandef->edmg.bw_config)
return false;
if (!cfg80211_valid_60g_freq(chandef->chan->center_freq))
return false;
for (i = 0; i < 6; i++) {
if (chandef->edmg.channels & BIT(i)) {
contiguous++;
num_of_enabled++;
} else {
contiguous = 0;
}
max_contiguous = max(contiguous, max_contiguous);
}
/* basic verification of edmg configuration according to
* IEEE P802.11ay/D4.0 section 9.4.2.251
*/
/* check bw_config against contiguous edmg channels */
switch (chandef->edmg.bw_config) {
case IEEE80211_EDMG_BW_CONFIG_4:
case IEEE80211_EDMG_BW_CONFIG_8:
case IEEE80211_EDMG_BW_CONFIG_12:
if (max_contiguous < 1)
return false;
break;
case IEEE80211_EDMG_BW_CONFIG_5:
case IEEE80211_EDMG_BW_CONFIG_9:
case IEEE80211_EDMG_BW_CONFIG_13:
if (max_contiguous < 2)
return false;
break;
case IEEE80211_EDMG_BW_CONFIG_6:
case IEEE80211_EDMG_BW_CONFIG_10:
case IEEE80211_EDMG_BW_CONFIG_14:
if (max_contiguous < 3)
return false;
break;
case IEEE80211_EDMG_BW_CONFIG_7:
case IEEE80211_EDMG_BW_CONFIG_11:
case IEEE80211_EDMG_BW_CONFIG_15:
if (max_contiguous < 4)
return false;
break;
default:
return false;
}
/* check bw_config against aggregated (non contiguous) edmg channels */
switch (chandef->edmg.bw_config) {
case IEEE80211_EDMG_BW_CONFIG_4:
case IEEE80211_EDMG_BW_CONFIG_5:
case IEEE80211_EDMG_BW_CONFIG_6:
case IEEE80211_EDMG_BW_CONFIG_7:
break;
case IEEE80211_EDMG_BW_CONFIG_8:
case IEEE80211_EDMG_BW_CONFIG_9:
case IEEE80211_EDMG_BW_CONFIG_10:
case IEEE80211_EDMG_BW_CONFIG_11:
if (num_of_enabled < 2)
return false;
break;
case IEEE80211_EDMG_BW_CONFIG_12:
case IEEE80211_EDMG_BW_CONFIG_13:
case IEEE80211_EDMG_BW_CONFIG_14:
case IEEE80211_EDMG_BW_CONFIG_15:
if (num_of_enabled < 4 || max_contiguous < 2)
return false;
break;
default:
return false;
}
return true;
}
int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width)
{
int mhz;
switch (chan_width) {
case NL80211_CHAN_WIDTH_1:
mhz = 1;
break;
case NL80211_CHAN_WIDTH_2:
mhz = 2;
break;
case NL80211_CHAN_WIDTH_4:
mhz = 4;
break;
case NL80211_CHAN_WIDTH_8:
mhz = 8;
break;
case NL80211_CHAN_WIDTH_16:
mhz = 16;
break;
case NL80211_CHAN_WIDTH_5:
mhz = 5;
break;
case NL80211_CHAN_WIDTH_10:
mhz = 10;
break;
case NL80211_CHAN_WIDTH_20:
case NL80211_CHAN_WIDTH_20_NOHT:
mhz = 20;
break;
case NL80211_CHAN_WIDTH_40:
mhz = 40;
break;
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_80:
mhz = 80;
break;
case NL80211_CHAN_WIDTH_160:
mhz = 160;
break;
case NL80211_CHAN_WIDTH_320:
mhz = 320;
break;
default:
WARN_ON_ONCE(1);
return -1;
}
return mhz;
}
EXPORT_SYMBOL(nl80211_chan_width_to_mhz);
static bool cfg80211_valid_center_freq(u32 center,
enum nl80211_chan_width width)
{
int bw;
int step;
/* We only do strict verification on 6 GHz */
if (center < 5955 || center > 7115)
return true;
bw = nl80211_chan_width_to_mhz(width);
if (bw < 0)
return false;
/* Validate that the channels bw is entirely within the 6 GHz band */
if (center - bw / 2 < 5945 || center + bw / 2 > 7125)
return false;
/* With 320 MHz the permitted channels overlap */
if (bw == 320)
step = 160;
else
step = bw;
/*
* Valid channels are packed from lowest frequency towards higher ones.
* So test that the lower frequency aligns with one of these steps.
*/
return (center - bw / 2 - 5945) % step == 0;
}
bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
{
u32 control_freq, oper_freq;
int oper_width, control_width;
if (!chandef->chan)
return false;
if (chandef->freq1_offset >= 1000)
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 (ieee80211_chandef_to_khz(chandef) !=
ieee80211_channel_to_khz(chandef->chan))
return false;
if (chandef->center_freq2)
return false;
break;
case NL80211_CHAN_WIDTH_1:
case NL80211_CHAN_WIDTH_2:
case NL80211_CHAN_WIDTH_4:
case NL80211_CHAN_WIDTH_8:
case NL80211_CHAN_WIDTH_16:
if (chandef->chan->band != NL80211_BAND_S1GHZ)
return false;
control_freq = ieee80211_channel_to_khz(chandef->chan);
oper_freq = ieee80211_chandef_to_khz(chandef);
control_width = nl80211_chan_width_to_mhz(
ieee80211_s1g_channel_width(
chandef->chan));
oper_width = cfg80211_chandef_get_width(chandef);
if (oper_width < 0 || control_width < 0)
return false;
if (chandef->center_freq2)
return false;
if (control_freq + MHZ_TO_KHZ(control_width) / 2 >
oper_freq + MHZ_TO_KHZ(oper_width) / 2)
return false;
if (control_freq - MHZ_TO_KHZ(control_width) / 2 <
oper_freq - MHZ_TO_KHZ(oper_width) / 2)
return false;
break;
case NL80211_CHAN_WIDTH_80P80:
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;
default:
if (chandef->center_freq2)
return false;
break;
}
switch (chandef->width) {
case NL80211_CHAN_WIDTH_5:
case NL80211_CHAN_WIDTH_10:
case NL80211_CHAN_WIDTH_20:
case NL80211_CHAN_WIDTH_20_NOHT:
case NL80211_CHAN_WIDTH_1:
case NL80211_CHAN_WIDTH_2:
case NL80211_CHAN_WIDTH_4:
case NL80211_CHAN_WIDTH_8:
case NL80211_CHAN_WIDTH_16:
/* all checked above */
break;
case NL80211_CHAN_WIDTH_320:
if (chandef->center_freq1 == control_freq + 150 ||
chandef->center_freq1 == control_freq + 130 ||
chandef->center_freq1 == control_freq + 110 ||
chandef->center_freq1 == control_freq + 90 ||
chandef->center_freq1 == control_freq - 90 ||
chandef->center_freq1 == control_freq - 110 ||
chandef->center_freq1 == control_freq - 130 ||
chandef->center_freq1 == control_freq - 150)
break;
fallthrough;
case NL80211_CHAN_WIDTH_160:
if (chandef->center_freq1 == control_freq + 70 ||
chandef->center_freq1 == control_freq + 50 ||
chandef->center_freq1 == control_freq - 50 ||
chandef->center_freq1 == control_freq - 70)
break;
fallthrough;
case NL80211_CHAN_WIDTH_80P80:
case NL80211_CHAN_WIDTH_80:
if (chandef->center_freq1 == control_freq + 30 ||
chandef->center_freq1 == control_freq - 30)
break;
fallthrough;
case NL80211_CHAN_WIDTH_40:
if (chandef->center_freq1 == control_freq + 10 ||
chandef->center_freq1 == control_freq - 10)
break;
fallthrough;
default:
return false;
}
if (!cfg80211_valid_center_freq(chandef->center_freq1, chandef->width))
return false;
if (chandef->width == NL80211_CHAN_WIDTH_80P80 &&
!cfg80211_valid_center_freq(chandef->center_freq2, chandef->width))
return false;
/* channel 14 is only for IEEE 802.11b */
if (chandef->center_freq1 == 2484 &&
chandef->width != NL80211_CHAN_WIDTH_20_NOHT)
return false;
if (cfg80211_chandef_is_edmg(chandef) &&
!cfg80211_edmg_chandef_valid(chandef))
return false;
return valid_puncturing_bitmap(chandef);
}
EXPORT_SYMBOL(cfg80211_chandef_valid);
int cfg80211_chandef_primary(const struct cfg80211_chan_def *c,
enum nl80211_chan_width primary_chan_width,
u16 *punctured)
{
int pri_width = nl80211_chan_width_to_mhz(primary_chan_width);
int width = cfg80211_chandef_get_width(c);
u32 control = c->chan->center_freq;
u32 center = c->center_freq1;
u16 _punct = 0;
if (WARN_ON_ONCE(pri_width < 0 || width < 0))
return -1;
/* not intended to be called this way, can't determine */
if (WARN_ON_ONCE(pri_width > width))
return -1;
if (!punctured)
punctured = &_punct;
*punctured = c->punctured;
while (width > pri_width) {
unsigned int bits_to_drop = width / 20 / 2;
if (control > center) {
center += width / 4;
*punctured >>= bits_to_drop;
} else {
center -= width / 4;
*punctured &= (1 << bits_to_drop) - 1;
}
width /= 2;
}
return center;
}
EXPORT_SYMBOL(cfg80211_chandef_primary);
static const struct cfg80211_chan_def *
check_chandef_primary_compat(const struct cfg80211_chan_def *c1,
const struct cfg80211_chan_def *c2,
enum nl80211_chan_width primary_chan_width)
{
u16 punct_c1 = 0, punct_c2 = 0;
/* check primary is compatible -> error if not */
if (cfg80211_chandef_primary(c1, primary_chan_width, &punct_c1) !=
cfg80211_chandef_primary(c2, primary_chan_width, &punct_c2))
return ERR_PTR(-EINVAL);
if (punct_c1 != punct_c2)
return ERR_PTR(-EINVAL);
/* assumes c1 is smaller width, if that was just checked -> done */
if (c1->width == primary_chan_width)
return c2;
/* otherwise continue checking the next width */
return NULL;
}
static const struct cfg80211_chan_def *
_cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
const struct cfg80211_chan_def *c2)
{
const struct cfg80211_chan_def *ret;
/* If they are identical, return */
if (cfg80211_chandef_identical(c1, c2))
return c2;
/* 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 5/10 MHz or S1G
* but they don't have the same width.
*/
#define NARROW_OR_S1G(width) ((width) == NL80211_CHAN_WIDTH_5 || \
(width) == NL80211_CHAN_WIDTH_10 || \
(width) == NL80211_CHAN_WIDTH_1 || \
(width) == NL80211_CHAN_WIDTH_2 || \
(width) == NL80211_CHAN_WIDTH_4 || \
(width) == NL80211_CHAN_WIDTH_8 || \
(width) == NL80211_CHAN_WIDTH_16)
if (NARROW_OR_S1G(c1->width) || NARROW_OR_S1G(c2->width))
return NULL;
/*
* Make sure that c1 is always the narrower one, so that later
* we either return NULL or c2 and don't have to check both
* directions.
*/
if (c1->width > c2->width)
swap(c1, c2);
/*
* No further checks needed if the "narrower" one is only 20 MHz.
* Here "narrower" includes being a 20 MHz non-HT channel vs. a
* 20 MHz HT (or later) one.
*/
if (c1->width <= NL80211_CHAN_WIDTH_20)
return c2;
ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_40);
if (ret)
return ret;
ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_80);
if (ret)
return ret;
/*
* If c1 is 80+80, then c2 is 160 or higher, but that cannot
* match. If c2 was also 80+80 it was already either accepted
* or rejected above (identical or not, respectively.)
*/
if (c1->width == NL80211_CHAN_WIDTH_80P80)
return NULL;
ret = check_chandef_primary_compat(c1, c2, NL80211_CHAN_WIDTH_160);
if (ret)
return ret;
/*
* Getting here would mean they're both wider than 160, have the
* same primary 160, but are not identical - this cannot happen
* since they must be 320 (no wider chandefs exist, at least yet.)
*/
WARN_ON_ONCE(1);
return NULL;
}
const struct cfg80211_chan_def *
cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1,
const struct cfg80211_chan_def *c2)
{
const struct cfg80211_chan_def *ret;
ret = _cfg80211_chandef_compatible(c1, c2);
if (IS_ERR(ret))
return NULL;
return ret;
}
EXPORT_SYMBOL(cfg80211_chandef_compatible);
void cfg80211_set_dfs_state(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef,
enum nl80211_dfs_state dfs_state)
{
struct ieee80211_channel *c;
int width;
if (WARN_ON(!cfg80211_chandef_valid(chandef)))
return;
width = cfg80211_chandef_get_width(chandef);
if (width < 0)
return;
for_each_subchan(chandef, freq, cf) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c || !(c->flags & IEEE80211_CHAN_RADAR))
continue;
c->dfs_state = dfs_state;
c->dfs_state_entered = jiffies;
}
}
static bool
cfg80211_dfs_permissive_check_wdev(struct cfg80211_registered_device *rdev,
enum nl80211_iftype iftype,
struct wireless_dev *wdev,
struct ieee80211_channel *chan)
{
unsigned int link_id;
for_each_valid_link(wdev, link_id) {
struct ieee80211_channel *other_chan = NULL;
struct cfg80211_chan_def chandef = {};
int ret;
/* In order to avoid daisy chaining only allow BSS STA */
if (wdev->iftype != NL80211_IFTYPE_STATION ||
!wdev->links[link_id].client.current_bss)
continue;
other_chan =
wdev->links[link_id].client.current_bss->pub.channel;
if (!other_chan)
continue;
if (chan == other_chan)
return true;
/* continue if we can't get the channel */
ret = rdev_get_channel(rdev, wdev, link_id, &chandef);
if (ret)
continue;
if (cfg80211_is_sub_chan(&chandef, chan, false))
return true;
}
return false;
}
/*
* Check if P2P GO is allowed to operate on a DFS channel
*/
static bool cfg80211_dfs_permissive_chan(struct wiphy *wiphy,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan)
{
struct wireless_dev *wdev;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
lockdep_assert_held(&rdev->wiphy.mtx);
if (!wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_DFS_CONCURRENT) ||
!(chan->flags & IEEE80211_CHAN_DFS_CONCURRENT))
return false;
/* only valid for P2P GO */
if (iftype != NL80211_IFTYPE_P2P_GO)
return false;
/*
* Allow only if there's a concurrent BSS
*/
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
bool ret = cfg80211_dfs_permissive_check_wdev(rdev, iftype,
wdev, chan);
if (ret)
return ret;
}
return false;
}
static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype)
{
struct ieee80211_channel *c;
for_each_subchan(chandef, freq, cf) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c)
return -EINVAL;
if (c->flags & IEEE80211_CHAN_RADAR &&
!cfg80211_dfs_permissive_chan(wiphy, iftype, c))
return 1;
}
return 0;
}
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, iftype);
return (ret > 0) ? BIT(chandef->width) : ret;
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_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
break;
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
}
return 0;
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_required);
bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef)
{
struct ieee80211_channel *c;
int width, count = 0;
if (WARN_ON(!cfg80211_chandef_valid(chandef)))
return false;
width = cfg80211_chandef_get_width(chandef);
if (width < 0)
return false;
/*
* 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_each_subchan(chandef, freq, cf) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c)
return false;
if (c->flags & IEEE80211_CHAN_DISABLED)
return false;
if (c->flags & IEEE80211_CHAN_RADAR) {
if (c->dfs_state == NL80211_DFS_UNAVAILABLE)
return false;
if (c->dfs_state == NL80211_DFS_USABLE)
count++;
}
}
return count > 0;
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_usable);
/*
* 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,
bool primary_only)
{
int width;
u32 freq;
if (!chandef->chan)
return false;
if (chandef->chan->center_freq == chan->center_freq)
return true;
if (primary_only)
return false;
width = cfg80211_chandef_get_width(chandef);
if (width <= 20)
return false;
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;
}
bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev)
{
unsigned int link;
lockdep_assert_wiphy(wdev->wiphy);
switch (wdev->iftype) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
for_each_valid_link(wdev, link) {
if (wdev->links[link].ap.beacon_interval)
return true;
}
break;
case NL80211_IFTYPE_ADHOC:
if (wdev->u.ibss.ssid_len)
return true;
break;
case NL80211_IFTYPE_MESH_POINT:
if (wdev->u.mesh.id_len)
return true;
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_P2P_DEVICE:
/* Can NAN type be considered as beaconing interface? */
case NL80211_IFTYPE_NAN:
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NL80211_IFTYPE_WDS:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
}
return false;
}
bool cfg80211_wdev_on_sub_chan(struct wireless_dev *wdev,
struct ieee80211_channel *chan,
bool primary_only)
{
unsigned int link;
switch (wdev->iftype) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
for_each_valid_link(wdev, link) {
if (cfg80211_is_sub_chan(&wdev->links[link].ap.chandef,
chan, primary_only))
return true;
}
break;
case NL80211_IFTYPE_ADHOC:
return cfg80211_is_sub_chan(&wdev->u.ibss.chandef, chan,
primary_only);
case NL80211_IFTYPE_MESH_POINT:
return cfg80211_is_sub_chan(&wdev->u.mesh.chandef, chan,
primary_only);
default:
break;
}
return false;
}
static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy,
struct ieee80211_channel *chan)
{
struct wireless_dev *wdev;
lockdep_assert_wiphy(wiphy);
list_for_each_entry(wdev, &wiphy->wdev_list, list) {
if (!cfg80211_beaconing_iface_active(wdev))
continue;
if (cfg80211_wdev_on_sub_chan(wdev, chan, false))
return true;
}
return false;
}
static bool
cfg80211_offchan_chain_is_active(struct cfg80211_registered_device *rdev,
struct ieee80211_channel *channel)
{
if (!rdev->background_radar_wdev)
return false;
if (!cfg80211_chandef_valid(&rdev->background_radar_chandef))
return false;
return cfg80211_is_sub_chan(&rdev->background_radar_chandef, channel,
false);
}
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;
for_each_rdev(rdev) {
bool found;
if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
continue;
guard(wiphy)(&rdev->wiphy);
found = cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan) ||
cfg80211_offchan_chain_is_active(rdev, chan);
if (found)
return true;
}
return false;
}
static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef)
{
struct ieee80211_channel *c;
int width;
bool dfs_offload;
if (WARN_ON(!cfg80211_chandef_valid(chandef)))
return false;
width = cfg80211_chandef_get_width(chandef);
if (width < 0)
return false;
dfs_offload = wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_DFS_OFFLOAD);
/*
* 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_each_subchan(chandef, freq, cf) {
c = ieee80211_get_channel_khz(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) &&
!(c->dfs_state == NL80211_DFS_USABLE && dfs_offload))
return false;
}
return true;
}
unsigned int
cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef)
{
struct ieee80211_channel *c;
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;
for_each_subchan(chandef, freq, cf) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c || (c->flags & IEEE80211_CHAN_DISABLED)) {
if (cf == 1)
t1 = INT_MAX;
else
t2 = INT_MAX;
continue;
}
if (!(c->flags & IEEE80211_CHAN_RADAR))
continue;
if (cf == 1 && c->dfs_cac_ms > t1)
t1 = c->dfs_cac_ms;
if (cf == 2 && c->dfs_cac_ms > t2)
t2 = c->dfs_cac_ms;
}
if (t1 == INT_MAX && t2 == INT_MAX)
return 0;
if (t1 == INT_MAX)
return t2;
if (t2 == INT_MAX)
return t1;
return max(t1, t2);
}
EXPORT_SYMBOL(cfg80211_chandef_dfs_cac_time);
/* check if the operating channels are valid and supported */
static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels,
enum ieee80211_edmg_bw_config edmg_bw_config,
int primary_channel,
struct ieee80211_edmg *edmg_cap)
{
struct ieee80211_channel *chan;
int i, freq;
int channels_counter = 0;
if (!edmg_channels && !edmg_bw_config)
return true;
if ((!edmg_channels && edmg_bw_config) ||
(edmg_channels && !edmg_bw_config))
return false;
if (!(edmg_channels & BIT(primary_channel - 1)))
return false;
/* 60GHz channels 1..6 */
for (i = 0; i < 6; i++) {
if (!(edmg_channels & BIT(i)))
continue;
if (!(edmg_cap->channels & BIT(i)))
return false;
channels_counter++;
freq = ieee80211_channel_to_frequency(i + 1,
NL80211_BAND_60GHZ);
chan = ieee80211_get_channel(wiphy, freq);
if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
return false;
}
/* IEEE802.11 allows max 4 channels */
if (channels_counter > 4)
return false;
/* check bw_config is a subset of what driver supports
* (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13)
*/
if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4))
return false;
if (edmg_bw_config > edmg_cap->bw_config)
return false;
return true;
}
bool _cfg80211_chandef_usable(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef,
u32 prohibited_flags,
u32 permitting_flags)
{
struct ieee80211_sta_ht_cap *ht_cap;
struct ieee80211_sta_vht_cap *vht_cap;
struct ieee80211_edmg *edmg_cap;
u32 width, control_freq, cap;
bool ext_nss_cap, support_80_80 = false, support_320 = false;
const struct ieee80211_sband_iftype_data *iftd;
struct ieee80211_supported_band *sband;
struct ieee80211_channel *c;
int i;
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;
edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap;
ext_nss_cap = __le16_to_cpu(vht_cap->vht_mcs.tx_highest) &
IEEE80211_VHT_EXT_NSS_BW_CAPABLE;
if (edmg_cap->channels &&
!cfg80211_edmg_usable(wiphy,
chandef->edmg.channels,
chandef->edmg.bw_config,
chandef->chan->hw_value,
edmg_cap))
return false;
control_freq = chandef->chan->center_freq;
switch (chandef->width) {
case NL80211_CHAN_WIDTH_1:
width = 1;
break;
case NL80211_CHAN_WIDTH_2:
width = 2;
break;
case NL80211_CHAN_WIDTH_4:
width = 4;
break;
case NL80211_CHAN_WIDTH_8:
width = 8;
break;
case NL80211_CHAN_WIDTH_16:
width = 16;
break;
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 &&
chandef->chan->band != NL80211_BAND_6GHZ)
return false;
fallthrough;
case NL80211_CHAN_WIDTH_20_NOHT:
prohibited_flags |= IEEE80211_CHAN_NO_20MHZ;
width = 20;
break;
case NL80211_CHAN_WIDTH_40:
width = 40;
if (chandef->chan->band == NL80211_BAND_6GHZ)
break;
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->chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
return false;
if (chandef->center_freq1 > control_freq &&
chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
return false;
break;
case NL80211_CHAN_WIDTH_80P80:
cap = vht_cap->cap;
support_80_80 =
(cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) ||
(cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) ||
(ext_nss_cap &&
u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1);
if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80)
return false;
fallthrough;
case NL80211_CHAN_WIDTH_80:
prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
width = 80;
if (chandef->chan->band == NL80211_BAND_6GHZ)
break;
if (!vht_cap->vht_supported)
return false;
break;
case NL80211_CHAN_WIDTH_160:
prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
width = 160;
if (chandef->chan->band == NL80211_BAND_6GHZ)
break;
if (!vht_cap->vht_supported)
return false;
cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ &&
cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ &&
!(ext_nss_cap &&
(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)))
return false;
break;
case NL80211_CHAN_WIDTH_320:
prohibited_flags |= IEEE80211_CHAN_NO_320MHZ;
width = 320;
if (chandef->chan->band != NL80211_BAND_6GHZ)
return false;
sband = wiphy->bands[NL80211_BAND_6GHZ];
if (!sband)
return false;
for_each_sband_iftype_data(sband, i, iftd) {
if (!iftd->eht_cap.has_eht)
continue;
if (iftd->eht_cap.eht_cap_elem.phy_cap_info[0] &
IEEE80211_EHT_PHY_CAP0_320MHZ_IN_6GHZ) {
support_320 = true;
break;
}
}
if (!support_320)
return false;
break;
default:
WARN_ON_ONCE(1);
return false;
}
/*
* TODO: What if there are only certain 80/160/80+80 MHz channels
* allowed by the driver, or only certain combinations?
* For 40 MHz the driver can set the NO_HT40 flags, but for
* 80/160 MHz and in particular 80+80 MHz this isn't really
* feasible and we only have NO_80MHZ/NO_160MHZ so far but
* no way to cover 80+80 MHz or more complex restrictions.
* Note that such restrictions also need to be advertised to
* userspace, for example for P2P channel selection.
*/
if (width > 20)
prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
/* 5 and 10 MHz are only defined for the OFDM PHY */
if (width < 20)
prohibited_flags |= IEEE80211_CHAN_NO_OFDM;
for_each_subchan(chandef, freq, cf) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c)
return false;
if (c->flags & permitting_flags)
continue;
if (c->flags & prohibited_flags)
return false;
}
return true;
}
bool cfg80211_chandef_usable(struct wiphy *wiphy,
const struct cfg80211_chan_def *chandef,
u32 prohibited_flags)
{
return _cfg80211_chandef_usable(wiphy, chandef, prohibited_flags, 0);
}
EXPORT_SYMBOL(cfg80211_chandef_usable);
static bool cfg80211_ir_permissive_check_wdev(enum nl80211_iftype iftype,
struct wireless_dev *wdev,
struct ieee80211_channel *chan)
{
struct ieee80211_channel *other_chan = NULL;
unsigned int link_id;
int r1, r2;
for_each_valid_link(wdev, link_id) {
if (wdev->iftype == NL80211_IFTYPE_STATION &&
wdev->links[link_id].client.current_bss)
other_chan = wdev->links[link_id].client.current_bss->pub.channel;
/*
* If a GO already operates on the same GO_CONCURRENT channel,
* this one (maybe the same one) can beacon as well. We allow
* the operation even if the station we relied on with
* GO_CONCURRENT is disconnected now. But then we must make sure
* we're not outdoor on an indoor-only channel.
*/
if (iftype == NL80211_IFTYPE_P2P_GO &&
wdev->iftype == NL80211_IFTYPE_P2P_GO &&
wdev->links[link_id].ap.beacon_interval &&
!(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
other_chan = wdev->links[link_id].ap.chandef.chan;
if (!other_chan)
continue;
if (chan == other_chan)
return true;
if (chan->band != NL80211_BAND_5GHZ &&
chan->band != NL80211_BAND_6GHZ)
continue;
r1 = cfg80211_get_unii(chan->center_freq);
r2 = cfg80211_get_unii(other_chan->center_freq);
if (r1 != -EINVAL && r1 == r2) {
/*
* At some locations channels 149-165 are considered a
* bundle, but at other locations, e.g., Indonesia,
* channels 149-161 are considered a bundle while
* channel 165 is left out and considered to be in a
* different bundle. Thus, in case that there is a
* station interface connected to an AP on channel 165,
* it is assumed that channels 149-161 are allowed for
* GO operations. However, having a station interface
* connected to an AP on channels 149-161, does not
* allow GO operation on channel 165.
*/
if (chan->center_freq == 5825 &&
other_chan->center_freq != 5825)
continue;
return true;
}
}
return false;
}
/*
* Check if the channel can be used under permissive conditions mandated by
* some regulatory bodies, i.e., the channel is marked with
* IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface
* associated to an AP on the same channel or on the same UNII band
* (assuming that the AP is an authorized master).
* In addition allow operation on a channel on which indoor operation is
* allowed, iff we are currently operating in an indoor environment.
*/
static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan)
{
struct wireless_dev *wdev;
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
lockdep_assert_held(&rdev->wiphy.mtx);
if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) ||
!(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR))
return false;
/* only valid for GO and TDLS off-channel (station/p2p-CL) */
if (iftype != NL80211_IFTYPE_P2P_GO &&
iftype != NL80211_IFTYPE_STATION &&
iftype != NL80211_IFTYPE_P2P_CLIENT)
return false;
if (regulatory_indoor_allowed() &&
(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
return true;
if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT))
return false;
/*
* Generally, it is possible to rely on another device/driver to allow
* the IR concurrent relaxation, however, since the device can further
* enforce the relaxation (by doing a similar verifications as this),
* and thus fail the GO instantiation, consider only the interfaces of
* the current registered device.
*/
list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
bool ret;
ret = cfg80211_ir_permissive_check_wdev(iftype, wdev, chan);
if (ret)
return ret;
}
return false;
}
static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype,
u32 prohibited_flags,
u32 permitting_flags)
{
bool res, check_radar;
int dfs_required;
trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype,
prohibited_flags,
permitting_flags);
if (!_cfg80211_chandef_usable(wiphy, chandef,
IEEE80211_CHAN_DISABLED, 0))
return false;
dfs_required = cfg80211_chandef_dfs_required(wiphy, chandef, iftype);
check_radar = dfs_required != 0;
if (dfs_required > 0 &&
cfg80211_chandef_dfs_available(wiphy, chandef)) {
/* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
prohibited_flags &= ~IEEE80211_CHAN_NO_IR;
check_radar = false;
}
if (check_radar &&
!_cfg80211_chandef_usable(wiphy, chandef,
IEEE80211_CHAN_RADAR, 0))
return false;
res = _cfg80211_chandef_usable(wiphy, chandef,
prohibited_flags,
permitting_flags);
trace_cfg80211_return_bool(res);
return res;
}
bool cfg80211_reg_check_beaconing(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
struct cfg80211_beaconing_check_config *cfg)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
u32 permitting_flags = 0;
bool check_no_ir = true;
/*
* Under certain conditions suggested by some regulatory bodies a
* GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag
* only if such relaxations are not enabled and the conditions are not
* met.
*/
if (cfg->relax) {
lockdep_assert_held(&rdev->wiphy.mtx);
check_no_ir = !cfg80211_ir_permissive_chan(wiphy, cfg->iftype,
chandef->chan);
}
if (cfg->reg_power == IEEE80211_REG_VLP_AP)
permitting_flags |= IEEE80211_CHAN_ALLOW_6GHZ_VLP_AP;
if ((cfg->iftype == NL80211_IFTYPE_P2P_GO ||
cfg->iftype == NL80211_IFTYPE_AP) &&
(chandef->width == NL80211_CHAN_WIDTH_20_NOHT ||
chandef->width == NL80211_CHAN_WIDTH_20))
permitting_flags |= IEEE80211_CHAN_ALLOW_20MHZ_ACTIVITY;
return _cfg80211_reg_can_beacon(wiphy, chandef, cfg->iftype,
check_no_ir ? IEEE80211_CHAN_NO_IR : 0,
permitting_flags);
}
EXPORT_SYMBOL(cfg80211_reg_check_beaconing);
int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
struct net_device *dev,
struct cfg80211_chan_def *chandef)
{
if (!rdev->ops->set_monitor_channel)
return -EOPNOTSUPP;
if (!cfg80211_has_monitors_only(rdev))
return -EBUSY;
return rdev_set_monitor_channel(rdev, dev, chandef);
}
bool cfg80211_any_usable_channels(struct wiphy *wiphy,
unsigned long sband_mask,
u32 prohibited_flags)
{
int idx;
prohibited_flags |= IEEE80211_CHAN_DISABLED;
for_each_set_bit(idx, &sband_mask, NUM_NL80211_BANDS) {
struct ieee80211_supported_band *sband = wiphy->bands[idx];
int chanidx;
if (!sband)
continue;
for (chanidx = 0; chanidx < sband->n_channels; chanidx++) {
struct ieee80211_channel *chan;
chan = &sband->channels[chanidx];
if (chan->flags & prohibited_flags)
continue;
return true;
}
}
return false;
}
EXPORT_SYMBOL(cfg80211_any_usable_channels);
struct cfg80211_chan_def *wdev_chandef(struct wireless_dev *wdev,
unsigned int link_id)
{
lockdep_assert_wiphy(wdev->wiphy);
WARN_ON(wdev->valid_links && !(wdev->valid_links & BIT(link_id)));
WARN_ON(!wdev->valid_links && link_id > 0);
switch (wdev->iftype) {
case NL80211_IFTYPE_MESH_POINT:
return &wdev->u.mesh.chandef;
case NL80211_IFTYPE_ADHOC:
return &wdev->u.ibss.chandef;
case NL80211_IFTYPE_OCB:
return &wdev->u.ocb.chandef;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
return &wdev->links[link_id].ap.chandef;
default:
return NULL;
}
}
EXPORT_SYMBOL(wdev_chandef);
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