138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
/*
|
|
* mac80211 - channel management
|
|
*/
|
|
|
|
#include <linux/nl80211.h>
|
|
#include <net/cfg80211.h>
|
|
#include "ieee80211_i.h"
|
|
|
|
static enum ieee80211_chan_mode
|
|
__ieee80211_get_channel_mode(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *ignore)
|
|
{
|
|
struct ieee80211_sub_if_data *sdata;
|
|
|
|
lockdep_assert_held(&local->iflist_mtx);
|
|
|
|
list_for_each_entry(sdata, &local->interfaces, list) {
|
|
if (sdata == ignore)
|
|
continue;
|
|
|
|
if (!ieee80211_sdata_running(sdata))
|
|
continue;
|
|
|
|
switch (sdata->vif.type) {
|
|
case NL80211_IFTYPE_MONITOR:
|
|
continue;
|
|
case NL80211_IFTYPE_STATION:
|
|
if (!sdata->u.mgd.associated)
|
|
continue;
|
|
break;
|
|
case NL80211_IFTYPE_ADHOC:
|
|
if (!sdata->u.ibss.ssid_len)
|
|
continue;
|
|
if (!sdata->u.ibss.fixed_channel)
|
|
return CHAN_MODE_HOPPING;
|
|
break;
|
|
case NL80211_IFTYPE_AP_VLAN:
|
|
/* will also have _AP interface */
|
|
continue;
|
|
case NL80211_IFTYPE_AP:
|
|
if (!sdata->u.ap.beacon)
|
|
continue;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return CHAN_MODE_FIXED;
|
|
}
|
|
|
|
return CHAN_MODE_UNDEFINED;
|
|
}
|
|
|
|
enum ieee80211_chan_mode
|
|
ieee80211_get_channel_mode(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *ignore)
|
|
{
|
|
enum ieee80211_chan_mode mode;
|
|
|
|
mutex_lock(&local->iflist_mtx);
|
|
mode = __ieee80211_get_channel_mode(local, ignore);
|
|
mutex_unlock(&local->iflist_mtx);
|
|
|
|
return mode;
|
|
}
|
|
|
|
bool ieee80211_set_channel_type(struct ieee80211_local *local,
|
|
struct ieee80211_sub_if_data *sdata,
|
|
enum nl80211_channel_type chantype)
|
|
{
|
|
struct ieee80211_sub_if_data *tmp;
|
|
enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
|
|
bool result;
|
|
|
|
mutex_lock(&local->iflist_mtx);
|
|
|
|
list_for_each_entry(tmp, &local->interfaces, list) {
|
|
if (tmp == sdata)
|
|
continue;
|
|
|
|
if (!ieee80211_sdata_running(tmp))
|
|
continue;
|
|
|
|
switch (tmp->vif.bss_conf.channel_type) {
|
|
case NL80211_CHAN_NO_HT:
|
|
case NL80211_CHAN_HT20:
|
|
if (superchan > tmp->vif.bss_conf.channel_type)
|
|
break;
|
|
|
|
superchan = tmp->vif.bss_conf.channel_type;
|
|
break;
|
|
case NL80211_CHAN_HT40PLUS:
|
|
WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
|
|
superchan = NL80211_CHAN_HT40PLUS;
|
|
break;
|
|
case NL80211_CHAN_HT40MINUS:
|
|
WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
|
|
superchan = NL80211_CHAN_HT40MINUS;
|
|
break;
|
|
}
|
|
}
|
|
|
|
switch (superchan) {
|
|
case NL80211_CHAN_NO_HT:
|
|
case NL80211_CHAN_HT20:
|
|
/*
|
|
* allow any change that doesn't go to no-HT
|
|
* (if it already is no-HT no change is needed)
|
|
*/
|
|
if (chantype == NL80211_CHAN_NO_HT)
|
|
break;
|
|
superchan = chantype;
|
|
break;
|
|
case NL80211_CHAN_HT40PLUS:
|
|
case NL80211_CHAN_HT40MINUS:
|
|
/* allow smaller bandwidth and same */
|
|
if (chantype == NL80211_CHAN_NO_HT)
|
|
break;
|
|
if (chantype == NL80211_CHAN_HT20)
|
|
break;
|
|
if (superchan == chantype)
|
|
break;
|
|
result = false;
|
|
goto out;
|
|
}
|
|
|
|
local->_oper_channel_type = superchan;
|
|
|
|
if (sdata)
|
|
sdata->vif.bss_conf.channel_type = chantype;
|
|
|
|
result = true;
|
|
out:
|
|
mutex_unlock(&local->iflist_mtx);
|
|
|
|
return result;
|
|
}
|