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linux-stable/net/wireless/chan.c
Johannes Berg a05829a722 cfg80211: avoid holding the RTNL when calling the driver 
Currently, _everything_ in cfg80211 holds the RTNL, and if you
have a slow USB device (or a few) you can get some bad lock
contention on that.

Fix that by re-adding a mutex to each wiphy/rdev as we had at
some point, so we have locking for the wireless_dev lists and
all the other things in there, and also so that drivers still
don't have to worry too much about it (they still won't get
parallel calls for a single device).

Then, we can restrict the RTNL to a few cases where we add or
remove interfaces and really need the added protection. Some
of the global list management still also uses the RTNL, since
we need to have it anyway for netdev management, but we only
hold the RTNL for very short periods of time here.

Link: https://lore.kernel.org/r/20210122161942.81df9f5e047a.I4a8e1a60b18863ea8c5e6d3a0faeafb2d45b2f40@changeid
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> [marvell driver issues]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2021-01-26 11:55:50 +01:00

1337 lines
33 KiB
C
Raw Blame History

// 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 2018-2020 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->chan = chan;
chandef->freq1_offset = chan->freq_offset;
chandef->center_freq2 = 0;
chandef->edmg.bw_config = 0;
chandef->edmg.channels = 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);
}
}
EXPORT_SYMBOL(cfg80211_chandef_create);
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;
}
static 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;
default:
WARN_ON_ONCE(1);
return -1;
}
return mhz;
}
static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
{
return nl80211_chan_width_to_mhz(c->width);
}
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_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;
}
/* 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 true;
}
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);
}
}
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;
}
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;
}
}
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);
}
static u32 cfg80211_get_start_freq(u32 center_freq,
u32 bandwidth)
{
u32 start_freq;
bandwidth = MHZ_TO_KHZ(bandwidth);
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(u32 center_freq,
u32 bandwidth)
{
u32 end_freq;
bandwidth = MHZ_TO_KHZ(bandwidth);
if (bandwidth <= MHZ_TO_KHZ(20))
end_freq = center_freq;
else
end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10);
return end_freq;
}
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 += MHZ_TO_KHZ(20)) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c)
return -EINVAL;
if (c->flags & IEEE80211_CHAN_RADAR)
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,
ieee80211_chandef_to_khz(chandef),
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,
MHZ_TO_KHZ(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_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);
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 += MHZ_TO_KHZ(20)) {
c = ieee80211_get_channel_khz(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;
}
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,
MHZ_TO_KHZ(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,
MHZ_TO_KHZ(chandef->center_freq2),
width);
if (r2 < 0)
return false;
break;
default:
WARN_ON(chandef->center_freq2);
break;
}
return (r1 + r2 > 0);
}
/*
* 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 freq;
if (chandef->chan->center_freq == chan->center_freq)
return true;
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)
{
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_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 active;
}
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;
}
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;
}
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;
bool dfs_offload;
dfs_offload = wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_DFS_OFFLOAD);
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 += MHZ_TO_KHZ(20)) {
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;
}
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,
MHZ_TO_KHZ(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,
MHZ_TO_KHZ(chandef->center_freq2),
width);
break;
default:
WARN_ON(chandef->center_freq2);
break;
}
return r;
}
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 += MHZ_TO_KHZ(20)) {
c = ieee80211_get_channel_khz(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;
}
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,
MHZ_TO_KHZ(chandef->center_freq1),
width);
if (!chandef->center_freq2)
return t1;
t2 = cfg80211_get_chans_dfs_cac_time(wiphy,
MHZ_TO_KHZ(chandef->center_freq2),
width);
return max(t1, t2);
}
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 += MHZ_TO_KHZ(20)) {
c = ieee80211_get_channel_khz(wiphy, freq);
if (!c || c->flags & prohibited_flags)
return false;
}
return true;
}
/* 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)
{
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 support_80_80 = false;
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;
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) ||
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 &&
!(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK))
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;
if (!cfg80211_secondary_chans_ok(wiphy,
ieee80211_chandef_to_khz(chandef),
width, prohibited_flags))
return false;
if (!chandef->center_freq2)
return true;
return cfg80211_secondary_chans_ok(wiphy,
MHZ_TO_KHZ(chandef->center_freq2),
width, prohibited_flags);
}
EXPORT_SYMBOL(cfg80211_chandef_usable);
/*
* 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) {
struct ieee80211_channel *other_chan = NULL;
int r1, r2;
wdev_lock(wdev);
if (wdev->iftype == NL80211_IFTYPE_STATION &&
wdev->current_bss)
other_chan = wdev->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->beacon_interval &&
!(chan->flags & IEEE80211_CHAN_INDOOR_ONLY))
other_chan = wdev->chandef.chan;
wdev_unlock(wdev);
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;
}
static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype,
bool check_no_ir)
{
bool res;
u32 prohibited_flags = IEEE80211_CHAN_DISABLED |
IEEE80211_CHAN_RADAR;
trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
if (check_no_ir)
prohibited_flags |= IEEE80211_CHAN_NO_IR;
if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 &&
cfg80211_chandef_dfs_available(wiphy, chandef)) {
/* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */
prohibited_flags = IEEE80211_CHAN_DISABLED;
}
res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags);
trace_cfg80211_return_bool(res);
return res;
}
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype)
{
return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true);
}
EXPORT_SYMBOL(cfg80211_reg_can_beacon);
bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy,
struct cfg80211_chan_def *chandef,
enum nl80211_iftype iftype)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
bool check_no_ir;
lockdep_assert_held(&rdev->wiphy.mtx);
/*
* 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.
*/
check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype,
chandef->chan);
return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir);
}
EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax);
int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
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, chandef);
}
void
cfg80211_get_chan_state(struct wireless_dev *wdev,
struct ieee80211_channel **chan,
enum cfg80211_chan_mode *chanmode,
u8 *radar_detect)
{
int ret;
*chan = NULL;
*chanmode = CHAN_MODE_UNDEFINED;
ASSERT_WDEV_LOCK(wdev);
if (wdev->netdev && !netif_running(wdev->netdev))
return;
switch (wdev->iftype) {
case NL80211_IFTYPE_ADHOC:
if (wdev->current_bss) {
*chan = wdev->current_bss->pub.channel;
*chanmode = (wdev->ibss_fixed &&
!wdev->ibss_dfs_possible)
? CHAN_MODE_SHARED
: CHAN_MODE_EXCLUSIVE;
/* consider worst-case - IBSS can try to return to the
* original user-specified channel as creator */
if (wdev->ibss_dfs_possible)
*radar_detect |= BIT(wdev->chandef.width);
return;
}
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
if (wdev->current_bss) {
*chan = wdev->current_bss->pub.channel;
*chanmode = CHAN_MODE_SHARED;
return;
}
break;
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_P2P_GO:
if (wdev->cac_started) {
*chan = wdev->chandef.chan;
*chanmode = CHAN_MODE_SHARED;
*radar_detect |= BIT(wdev->chandef.width);
} else if (wdev->beacon_interval) {
*chan = wdev->chandef.chan;
*chanmode = CHAN_MODE_SHARED;
ret = cfg80211_chandef_dfs_required(wdev->wiphy,
&wdev->chandef,
wdev->iftype);
WARN_ON(ret < 0);
if (ret > 0)
*radar_detect |= BIT(wdev->chandef.width);
}
return;
case NL80211_IFTYPE_MESH_POINT:
if (wdev->mesh_id_len) {
*chan = wdev->chandef.chan;
*chanmode = CHAN_MODE_SHARED;
ret = cfg80211_chandef_dfs_required(wdev->wiphy,
&wdev->chandef,
wdev->iftype);
WARN_ON(ret < 0);
if (ret > 0)
*radar_detect |= BIT(wdev->chandef.width);
}
return;
case NL80211_IFTYPE_OCB:
if (wdev->chandef.chan) {
*chan = wdev->chandef.chan;
*chanmode = CHAN_MODE_SHARED;
return;
}
break;
case NL80211_IFTYPE_MONITOR:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_P2P_DEVICE:
case NL80211_IFTYPE_NAN:
/* these interface types don't really have a channel */
return;
case NL80211_IFTYPE_UNSPECIFIED:
case NL80211_IFTYPE_WDS:
case NUM_NL80211_IFTYPES:
WARN_ON(1);
}
}
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