2 * This file contains helper code to handle channel
3 * settings and keeping track of what is possible at
6 * Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
9 #include <linux/export.h>
10 #include <net/cfg80211.h>
13 struct ieee80211_channel *
14 rdev_freq_to_chan(struct cfg80211_registered_device *rdev,
15 int freq, enum nl80211_channel_type channel_type)
17 struct ieee80211_channel *chan;
18 struct ieee80211_sta_ht_cap *ht_cap;
20 chan = ieee80211_get_channel(&rdev->wiphy, freq);
22 /* Primary channel not allowed */
23 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
26 if (channel_type == NL80211_CHAN_HT40MINUS &&
27 chan->flags & IEEE80211_CHAN_NO_HT40MINUS)
29 else if (channel_type == NL80211_CHAN_HT40PLUS &&
30 chan->flags & IEEE80211_CHAN_NO_HT40PLUS)
33 ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap;
35 if (channel_type != NL80211_CHAN_NO_HT) {
36 if (!ht_cap->ht_supported)
39 if (channel_type != NL80211_CHAN_HT20 &&
40 (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) ||
41 ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT))
48 bool cfg80211_can_beacon_sec_chan(struct wiphy *wiphy,
49 struct ieee80211_channel *chan,
50 enum nl80211_channel_type channel_type)
52 struct ieee80211_channel *sec_chan;
55 switch (channel_type) {
56 case NL80211_CHAN_HT40PLUS:
59 case NL80211_CHAN_HT40MINUS:
66 sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff);
70 /* we'll need a DFS capability later */
71 if (sec_chan->flags & (IEEE80211_CHAN_DISABLED |
72 IEEE80211_CHAN_PASSIVE_SCAN |
73 IEEE80211_CHAN_NO_IBSS |
74 IEEE80211_CHAN_RADAR))
79 EXPORT_SYMBOL(cfg80211_can_beacon_sec_chan);
81 int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev,
82 int freq, enum nl80211_channel_type chantype)
84 struct ieee80211_channel *chan;
87 if (!rdev->ops->set_monitor_channel)
89 if (!cfg80211_has_monitors_only(rdev))
92 chan = rdev_freq_to_chan(rdev, freq, chantype);
96 err = rdev->ops->set_monitor_channel(&rdev->wiphy, chan, chantype);
98 rdev->monitor_channel = chan;
99 rdev->monitor_channel_type = chantype;
106 cfg80211_get_chan_state(struct cfg80211_registered_device *rdev,
107 struct wireless_dev *wdev,
108 struct ieee80211_channel **chan,
109 enum cfg80211_chan_mode *chanmode)
112 *chanmode = CHAN_MODE_UNDEFINED;
114 ASSERT_RDEV_LOCK(rdev);
115 ASSERT_WDEV_LOCK(wdev);
117 if (!netif_running(wdev->netdev))
120 switch (wdev->iftype) {
121 case NL80211_IFTYPE_ADHOC:
122 if (wdev->current_bss) {
123 *chan = wdev->current_bss->pub.channel;
124 *chanmode = wdev->ibss_fixed
126 : CHAN_MODE_EXCLUSIVE;
129 case NL80211_IFTYPE_STATION:
130 case NL80211_IFTYPE_P2P_CLIENT:
131 if (wdev->current_bss) {
132 *chan = wdev->current_bss->pub.channel;
133 *chanmode = CHAN_MODE_SHARED;
137 case NL80211_IFTYPE_AP:
138 case NL80211_IFTYPE_P2P_GO:
139 case NL80211_IFTYPE_MESH_POINT:
140 *chan = wdev->channel;
141 *chanmode = CHAN_MODE_SHARED;
143 case NL80211_IFTYPE_MONITOR:
144 case NL80211_IFTYPE_AP_VLAN:
145 case NL80211_IFTYPE_WDS:
146 /* these interface types don't really have a channel */
148 case NL80211_IFTYPE_UNSPECIFIED:
149 case NUM_NL80211_IFTYPES: