2 * mac80211 - channel management
5 #include <linux/nl80211.h>
6 #include <net/cfg80211.h>
7 #include "ieee80211_i.h"
9 static enum ieee80211_chan_mode
10 __ieee80211_get_channel_mode(struct ieee80211_local *local,
11 struct ieee80211_sub_if_data *ignore)
13 struct ieee80211_sub_if_data *sdata;
15 lockdep_assert_held(&local->iflist_mtx);
17 list_for_each_entry(sdata, &local->interfaces, list) {
21 if (!ieee80211_sdata_running(sdata))
24 switch (sdata->vif.type) {
25 case NL80211_IFTYPE_MONITOR:
27 case NL80211_IFTYPE_STATION:
28 if (!sdata->u.mgd.associated)
31 case NL80211_IFTYPE_ADHOC:
32 if (!sdata->u.ibss.ssid_len)
34 if (!sdata->u.ibss.fixed_channel)
35 return CHAN_MODE_HOPPING;
37 case NL80211_IFTYPE_AP_VLAN:
38 /* will also have _AP interface */
40 case NL80211_IFTYPE_AP:
41 if (!sdata->u.ap.beacon)
48 return CHAN_MODE_FIXED;
51 return CHAN_MODE_UNDEFINED;
54 enum ieee80211_chan_mode
55 ieee80211_get_channel_mode(struct ieee80211_local *local,
56 struct ieee80211_sub_if_data *ignore)
58 enum ieee80211_chan_mode mode;
60 mutex_lock(&local->iflist_mtx);
61 mode = __ieee80211_get_channel_mode(local, ignore);
62 mutex_unlock(&local->iflist_mtx);
67 bool ieee80211_set_channel_type(struct ieee80211_local *local,
68 struct ieee80211_sub_if_data *sdata,
69 enum nl80211_channel_type chantype)
71 struct ieee80211_sub_if_data *tmp;
72 enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
75 mutex_lock(&local->iflist_mtx);
77 list_for_each_entry(tmp, &local->interfaces, list) {
81 if (!ieee80211_sdata_running(tmp))
84 switch (tmp->vif.bss_conf.channel_type) {
85 case NL80211_CHAN_NO_HT:
86 case NL80211_CHAN_HT20:
87 if (superchan > tmp->vif.bss_conf.channel_type)
90 superchan = tmp->vif.bss_conf.channel_type;
92 case NL80211_CHAN_HT40PLUS:
93 WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
94 superchan = NL80211_CHAN_HT40PLUS;
96 case NL80211_CHAN_HT40MINUS:
97 WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
98 superchan = NL80211_CHAN_HT40MINUS;
104 case NL80211_CHAN_NO_HT:
105 case NL80211_CHAN_HT20:
107 * allow any change that doesn't go to no-HT
108 * (if it already is no-HT no change is needed)
110 if (chantype == NL80211_CHAN_NO_HT)
112 superchan = chantype;
114 case NL80211_CHAN_HT40PLUS:
115 case NL80211_CHAN_HT40MINUS:
116 /* allow smaller bandwidth and same */
117 if (chantype == NL80211_CHAN_NO_HT)
119 if (chantype == NL80211_CHAN_HT20)
121 if (superchan == chantype)
127 local->_oper_channel_type = superchan;
130 sdata->vif.bss_conf.channel_type = chantype;
134 mutex_unlock(&local->iflist_mtx);