371 lines
9.0 KiB
C
371 lines
9.0 KiB
C
/*
|
|
* 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>
|
|
*/
|
|
|
|
#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_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;
|
|
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,
|
|
int *pri40, int *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;
|
|
|
|
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 bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
|
|
u32 center_freq, u32 bandwidth,
|
|
u32 prohibited_flags)
|
|
{
|
|
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 & 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;
|
|
|
|
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_20:
|
|
if (!ht_cap->ht_supported)
|
|
return false;
|
|
case NL80211_CHAN_WIDTH_20_NOHT:
|
|
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:
|
|
if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))
|
|
return false;
|
|
case NL80211_CHAN_WIDTH_80:
|
|
if (!vht_cap->vht_supported)
|
|
return false;
|
|
width = 80;
|
|
break;
|
|
case NL80211_CHAN_WIDTH_160:
|
|
if (!vht_cap->vht_supported)
|
|
return false;
|
|
if (!(vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ))
|
|
return false;
|
|
width = 160;
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
return false;
|
|
}
|
|
|
|
/* TODO: missing regulatory check on 80/160 bandwidth */
|
|
|
|
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);
|
|
|
|
bool cfg80211_reg_can_beacon(struct wiphy *wiphy,
|
|
struct cfg80211_chan_def *chandef)
|
|
{
|
|
bool res;
|
|
|
|
trace_cfg80211_reg_can_beacon(wiphy, chandef);
|
|
|
|
res = cfg80211_chandef_usable(wiphy, chandef,
|
|
IEEE80211_CHAN_DISABLED |
|
|
IEEE80211_CHAN_PASSIVE_SCAN |
|
|
IEEE80211_CHAN_NO_IBSS |
|
|
IEEE80211_CHAN_RADAR);
|
|
|
|
trace_cfg80211_return_bool(res);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_reg_can_beacon);
|
|
|
|
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)
|
|
{
|
|
*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
|
|
? CHAN_MODE_SHARED
|
|
: CHAN_MODE_EXCLUSIVE;
|
|
return;
|
|
}
|
|
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->beacon_interval) {
|
|
*chan = wdev->channel;
|
|
*chanmode = CHAN_MODE_SHARED;
|
|
}
|
|
return;
|
|
case NL80211_IFTYPE_MESH_POINT:
|
|
if (wdev->mesh_id_len) {
|
|
*chan = wdev->channel;
|
|
*chanmode = CHAN_MODE_SHARED;
|
|
}
|
|
return;
|
|
case NL80211_IFTYPE_MONITOR:
|
|
case NL80211_IFTYPE_AP_VLAN:
|
|
case NL80211_IFTYPE_WDS:
|
|
/* these interface types don't really have a channel */
|
|
return;
|
|
case NL80211_IFTYPE_P2P_DEVICE:
|
|
if (wdev->wiphy->features &
|
|
NL80211_FEATURE_P2P_DEVICE_NEEDS_CHANNEL)
|
|
*chanmode = CHAN_MODE_EXCLUSIVE;
|
|
return;
|
|
case NL80211_IFTYPE_UNSPECIFIED:
|
|
case NUM_NL80211_IFTYPES:
|
|
WARN_ON(1);
|
|
}
|
|
|
|
return;
|
|
}
|