![David S. Miller](/assets/img/avatar_default.png)
Files removed in 'net-next' had their license header updated in 'net'. We take the remove from 'net-next'. Signed-off-by: David S. Miller <davem@davemloft.net>
1074 lines
26 KiB
C
1074 lines
26 KiB
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);
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
|
|
if (bandwidth <= 20)
|
|
start_freq = center_freq;
|
|
else
|
|
start_freq = center_freq - bandwidth/2 + 10;
|
|
|
|
return start_freq;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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_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;
|
|
}
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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->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 & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
|
|
if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
|
|
return false;
|
|
case NL80211_CHAN_WIDTH_80:
|
|
if (!vht_cap->vht_supported)
|
|
return false;
|
|
prohibited_flags |= IEEE80211_CHAN_NO_80MHZ;
|
|
width = 80;
|
|
break;
|
|
case NL80211_CHAN_WIDTH_160:
|
|
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)
|
|
return false;
|
|
prohibited_flags |= IEEE80211_CHAN_NO_160MHZ;
|
|
width = 160;
|
|
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, chandef->center_freq1,
|
|
width, prohibited_flags))
|
|
return false;
|
|
|
|
if (!chandef->center_freq2)
|
|
return true;
|
|
return cfg80211_secondary_chans_ok(wiphy, 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);
|
|
|
|
ASSERT_RTNL();
|
|
|
|
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)
|
|
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)
|
|
{
|
|
bool check_no_ir;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
/*
|
|
* 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_WDS:
|
|
case NL80211_IFTYPE_P2P_DEVICE:
|
|
case NL80211_IFTYPE_NAN:
|
|
/* these interface types don't really have a channel */
|
|
return;
|
|
case NL80211_IFTYPE_UNSPECIFIED:
|
|
case NUM_NL80211_IFTYPES:
|
|
WARN_ON(1);
|
|
}
|
|
}
|