![Michal Kazior](/assets/img/avatar_default.png)
Split functionality for further reuse. Will prevent code duplication when channel context channel_type merging is introduced. Signed-off-by: Michal Kazior <michal.kazior@tieto.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
171 lines
3.7 KiB
C
171 lines
3.7 KiB
C
/*
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* mac80211 - channel management
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*/
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#include <linux/nl80211.h>
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#include <net/cfg80211.h>
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#include "ieee80211_i.h"
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static enum ieee80211_chan_mode
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__ieee80211_get_channel_mode(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *ignore)
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{
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struct ieee80211_sub_if_data *sdata;
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lockdep_assert_held(&local->iflist_mtx);
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list_for_each_entry(sdata, &local->interfaces, list) {
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if (sdata == ignore)
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continue;
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if (!ieee80211_sdata_running(sdata))
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continue;
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_MONITOR:
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continue;
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case NL80211_IFTYPE_STATION:
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if (!sdata->u.mgd.associated)
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continue;
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break;
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case NL80211_IFTYPE_ADHOC:
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if (!sdata->u.ibss.ssid_len)
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continue;
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if (!sdata->u.ibss.fixed_channel)
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return CHAN_MODE_HOPPING;
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break;
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case NL80211_IFTYPE_AP_VLAN:
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/* will also have _AP interface */
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continue;
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case NL80211_IFTYPE_AP:
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if (!sdata->u.ap.beacon)
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continue;
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break;
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case NL80211_IFTYPE_MESH_POINT:
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if (!sdata->wdev.mesh_id_len)
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continue;
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break;
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default:
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break;
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}
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return CHAN_MODE_FIXED;
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}
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return CHAN_MODE_UNDEFINED;
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}
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enum ieee80211_chan_mode
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ieee80211_get_channel_mode(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *ignore)
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{
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enum ieee80211_chan_mode mode;
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mutex_lock(&local->iflist_mtx);
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mode = __ieee80211_get_channel_mode(local, ignore);
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mutex_unlock(&local->iflist_mtx);
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return mode;
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}
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static enum nl80211_channel_type
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ieee80211_get_superchan(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata)
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{
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enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
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struct ieee80211_sub_if_data *tmp;
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mutex_lock(&local->iflist_mtx);
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list_for_each_entry(tmp, &local->interfaces, list) {
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if (tmp == sdata)
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continue;
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if (!ieee80211_sdata_running(tmp))
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continue;
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switch (tmp->vif.bss_conf.channel_type) {
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case NL80211_CHAN_NO_HT:
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case NL80211_CHAN_HT20:
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if (superchan > tmp->vif.bss_conf.channel_type)
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break;
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superchan = tmp->vif.bss_conf.channel_type;
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break;
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case NL80211_CHAN_HT40PLUS:
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WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
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superchan = NL80211_CHAN_HT40PLUS;
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break;
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case NL80211_CHAN_HT40MINUS:
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WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
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superchan = NL80211_CHAN_HT40MINUS;
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break;
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}
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}
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mutex_unlock(&local->iflist_mtx);
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return superchan;
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}
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static bool
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ieee80211_channel_types_are_compatible(enum nl80211_channel_type chantype1,
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enum nl80211_channel_type chantype2,
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enum nl80211_channel_type *compat)
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{
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/*
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* start out with chantype1 being the result,
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* overwriting later if needed
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*/
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if (compat)
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*compat = chantype1;
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switch (chantype1) {
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case NL80211_CHAN_NO_HT:
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if (compat)
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*compat = chantype2;
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break;
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case NL80211_CHAN_HT20:
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/*
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* allow any change that doesn't go to no-HT
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* (if it already is no-HT no change is needed)
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*/
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if (chantype2 == NL80211_CHAN_NO_HT)
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break;
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if (compat)
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*compat = chantype2;
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break;
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case NL80211_CHAN_HT40PLUS:
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case NL80211_CHAN_HT40MINUS:
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/* allow smaller bandwidth and same */
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if (chantype2 == NL80211_CHAN_NO_HT)
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break;
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if (chantype2 == NL80211_CHAN_HT20)
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break;
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if (chantype2 == chantype1)
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break;
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return false;
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}
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return true;
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}
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bool ieee80211_set_channel_type(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata,
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enum nl80211_channel_type chantype)
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{
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enum nl80211_channel_type superchan;
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enum nl80211_channel_type compatchan;
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superchan = ieee80211_get_superchan(local, sdata);
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if (!ieee80211_channel_types_are_compatible(superchan, chantype,
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&compatchan))
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return false;
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local->_oper_channel_type = compatchan;
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if (sdata)
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sdata->vif.bss_conf.channel_type = chantype;
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return true;
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}
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