/* * mac80211 - channel management */ #include <linux/nl80211.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; WARN_ON(!mutex_is_locked(&local->iflist_mtx)); 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; } 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: 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; }