Eric Lee / smarc-fsl-linux-kernel

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net/mac80211/chan.c 2.79 KB
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f444de05d   Johannes Berg   cfg80211/mac80211... 
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  /*
   * mac80211 - channel management
   */
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  #include <linux/nl80211.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,
  			     struct ieee80211_sub_if_data *ignore)
  {
  	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) {
  		if (sdata == ignore)
  			continue;
  
  		if (!ieee80211_sdata_running(sdata))
  			continue;
  
  		if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
  			continue;
  
  		if (sdata->vif.type == NL80211_IFTYPE_STATION &&
  		    !sdata->u.mgd.associated)
  			continue;
  
  		if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
  			if (!sdata->u.ibss.ssid_len)
  				continue;
  			if (!sdata->u.ibss.fixed_channel)
  				return CHAN_MODE_HOPPING;
  		}
  
  		if (sdata->vif.type == NL80211_IFTYPE_AP &&
  		    !sdata->u.ap.beacon)
  			continue;
  
  		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;
  }
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  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:
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  			if (superchan > tmp->vif.bss_conf.channel_type)
  				break;
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  			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;
  }