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Currently, when one interface switches HT mode, all others will follow along. This is clearly undesirable, since the new one might switch to no-HT while another one is operating in HT. Address this issue by keeping track of the HT mode per interface, and allowing only changes that are compatible, i.e. switching into HT40+ is not possible when another interface is in HT40-, in that case the second one needs to fall back to HT20. Also, to allow drivers to know what's going on, store the per-interface HT mode (channel type) in the virtual interface's bss_conf. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
128 lines
2.7 KiB
C
128 lines
2.7 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 "ieee80211_i.h"
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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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struct ieee80211_sub_if_data *sdata;
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WARN_ON(!mutex_is_locked(&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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if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
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continue;
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if (sdata->vif.type == NL80211_IFTYPE_STATION &&
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!sdata->u.mgd.associated)
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continue;
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if (sdata->vif.type == 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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}
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if (sdata->vif.type == NL80211_IFTYPE_AP &&
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!sdata->u.ap.beacon)
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continue;
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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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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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struct ieee80211_sub_if_data *tmp;
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enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
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bool result;
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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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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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switch (superchan) {
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case NL80211_CHAN_NO_HT:
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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 (chantype == NL80211_CHAN_NO_HT)
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break;
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superchan = chantype;
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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 (chantype == NL80211_CHAN_NO_HT)
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break;
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if (chantype == NL80211_CHAN_HT20)
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break;
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if (superchan == chantype)
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break;
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result = false;
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goto out;
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}
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local->_oper_channel_type = superchan;
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if (sdata)
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sdata->vif.bss_conf.channel_type = chantype;
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result = true;
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out:
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mutex_unlock(&local->iflist_mtx);
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return result;
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}
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