153 lines
3.5 KiB
C
153 lines
3.5 KiB
C
/*
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* This file contains helper code to handle channel
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* settings and keeping track of what is possible at
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* any point in time.
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*
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* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/export.h>
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#include <net/cfg80211.h>
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#include "core.h"
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struct ieee80211_channel *
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rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
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int freq, enum nl80211_channel_type channel_type)
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{
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struct ieee80211_channel *chan;
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struct ieee80211_sta_ht_cap *ht_cap;
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chan = ieee80211_get_channel(&rdev->wiphy, freq);
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/* Primary channel not allowed */
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if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
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return NULL;
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if (channel_type == NL80211_CHAN_HT40MINUS &&
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chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
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return NULL;
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else if (channel_type == NL80211_CHAN_HT40PLUS &&
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chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
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return NULL;
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ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
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if (channel_type != NL80211_CHAN_NO_HT) {
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if (!ht_cap->ht_supported)
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return NULL;
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if (channel_type != NL80211_CHAN_HT20 &&
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(!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
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ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT))
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return NULL;
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}
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return chan;
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}
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bool cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
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struct ieee80211_channel *chan,
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enum nl80211_channel_type channel_type)
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{
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struct ieee80211_channel *sec_chan;
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int diff;
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switch (channel_type) {
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case NL80211_CHAN_HT40PLUS:
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diff = 20;
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break;
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case NL80211_CHAN_HT40MINUS:
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diff = -20;
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break;
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default:
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return true;
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}
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sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff);
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if (!sec_chan)
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return false;
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/* we'll need a DFS capability later */
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if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
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IEEE80211_CHAN_PASSIVE_SCAN |
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IEEE80211_CHAN_NO_IBSS |
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IEEE80211_CHAN_RADAR))
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return false;
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return true;
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}
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EXPORT_SYMBOL(cfg80211_can_beacon_sec_chan);
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int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
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int freq, enum nl80211_channel_type chantype)
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{
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struct ieee80211_channel *chan;
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if (!rdev->ops->set_monitor_channel)
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return -EOPNOTSUPP;
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if (!cfg80211_has_monitors_only(rdev))
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return -EBUSY;
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chan = rdev_freq_to_chan(rdev, freq, chantype);
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if (!chan)
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return -EINVAL;
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return rdev->ops->set_monitor_channel(&rdev->wiphy, chan, chantype);
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}
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void
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cfg80211_get_chan_state(struct wireless_dev *wdev,
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struct ieee80211_channel **chan,
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enum cfg80211_chan_mode *chanmode)
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{
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*chan = NULL;
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*chanmode = CHAN_MODE_UNDEFINED;
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ASSERT_WDEV_LOCK(wdev);
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if (!netif_running(wdev->netdev))
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return;
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switch (wdev->iftype) {
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case NL80211_IFTYPE_ADHOC:
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if (wdev->current_bss) {
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*chan = wdev->current_bss->pub.channel;
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*chanmode = wdev->ibss_fixed
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? CHAN_MODE_SHARED
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: CHAN_MODE_EXCLUSIVE;
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return;
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}
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case NL80211_IFTYPE_STATION:
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case NL80211_IFTYPE_P2P_CLIENT:
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if (wdev->current_bss) {
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*chan = wdev->current_bss->pub.channel;
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*chanmode = CHAN_MODE_SHARED;
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return;
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}
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break;
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_P2P_GO:
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if (wdev->beacon_interval) {
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*chan = wdev->channel;
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*chanmode = CHAN_MODE_SHARED;
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}
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return;
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case NL80211_IFTYPE_MESH_POINT:
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if (wdev->mesh_id_len) {
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*chan = wdev->channel;
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*chanmode = CHAN_MODE_SHARED;
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}
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return;
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case NL80211_IFTYPE_MONITOR:
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case NL80211_IFTYPE_AP_VLAN:
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case NL80211_IFTYPE_WDS:
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/* these interface types don't really have a channel */
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return;
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case NL80211_IFTYPE_UNSPECIFIED:
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case NUM_NL80211_IFTYPES:
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WARN_ON(1);
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}
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return;
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}
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