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Johannes Bergf444de02010-05-05 15:25:02 +02001/*
2 * mac80211 - channel management
3 */
4
Johannes Berg0aaffa92010-05-05 15:28:27 +02005#include <linux/nl80211.h>
Paul Stewart3117bbdb2012-03-13 07:46:18 -07006#include <net/cfg80211.h>
Johannes Bergf444de02010-05-05 15:25:02 +02007#include "ieee80211_i.h"
8
Johannes Berg368a07d2010-05-28 14:26:23 +02009static enum ieee80211_chan_mode
Johannes Bergf444de02010-05-05 15:25:02 +020010__ieee80211_get_channel_mode(struct ieee80211_local *local,
11 struct ieee80211_sub_if_data *ignore)
12{
13 struct ieee80211_sub_if_data *sdata;
14
Johannes Berg46a5eba2010-09-15 13:28:15 +020015 lockdep_assert_held(&local->iflist_mtx);
Johannes Bergf444de02010-05-05 15:25:02 +020016
17 list_for_each_entry(sdata, &local->interfaces, list) {
18 if (sdata == ignore)
19 continue;
20
21 if (!ieee80211_sdata_running(sdata))
22 continue;
23
Johannes Berge9980e62012-01-09 13:57:36 +010024 switch (sdata->vif.type) {
25 case NL80211_IFTYPE_MONITOR:
Johannes Bergf444de02010-05-05 15:25:02 +020026 continue;
Johannes Berge9980e62012-01-09 13:57:36 +010027 case NL80211_IFTYPE_STATION:
28 if (!sdata->u.mgd.associated)
29 continue;
30 break;
31 case NL80211_IFTYPE_ADHOC:
Johannes Bergf444de02010-05-05 15:25:02 +020032 if (!sdata->u.ibss.ssid_len)
33 continue;
34 if (!sdata->u.ibss.fixed_channel)
35 return CHAN_MODE_HOPPING;
Johannes Berge9980e62012-01-09 13:57:36 +010036 break;
37 case NL80211_IFTYPE_AP_VLAN:
38 /* will also have _AP interface */
Johannes Bergf444de02010-05-05 15:25:02 +020039 continue;
Johannes Berge9980e62012-01-09 13:57:36 +010040 case NL80211_IFTYPE_AP:
41 if (!sdata->u.ap.beacon)
42 continue;
43 break;
Thomas Pedersenbe0f4232012-05-13 22:24:08 -070044 case NL80211_IFTYPE_MESH_POINT:
45 if (!sdata->wdev.mesh_id_len)
46 continue;
47 break;
Johannes Berge9980e62012-01-09 13:57:36 +010048 default:
49 break;
50 }
Johannes Bergf444de02010-05-05 15:25:02 +020051
52 return CHAN_MODE_FIXED;
53 }
54
55 return CHAN_MODE_UNDEFINED;
56}
57
58enum ieee80211_chan_mode
59ieee80211_get_channel_mode(struct ieee80211_local *local,
60 struct ieee80211_sub_if_data *ignore)
61{
62 enum ieee80211_chan_mode mode;
63
64 mutex_lock(&local->iflist_mtx);
65 mode = __ieee80211_get_channel_mode(local, ignore);
66 mutex_unlock(&local->iflist_mtx);
67
68 return mode;
69}
Johannes Berg0aaffa92010-05-05 15:28:27 +020070
71bool ieee80211_set_channel_type(struct ieee80211_local *local,
72 struct ieee80211_sub_if_data *sdata,
73 enum nl80211_channel_type chantype)
74{
75 struct ieee80211_sub_if_data *tmp;
76 enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
77 bool result;
78
79 mutex_lock(&local->iflist_mtx);
80
81 list_for_each_entry(tmp, &local->interfaces, list) {
82 if (tmp == sdata)
83 continue;
84
85 if (!ieee80211_sdata_running(tmp))
86 continue;
87
88 switch (tmp->vif.bss_conf.channel_type) {
89 case NL80211_CHAN_NO_HT:
90 case NL80211_CHAN_HT20:
Felix Fietkau9db372f2011-03-11 21:45:51 +010091 if (superchan > tmp->vif.bss_conf.channel_type)
92 break;
93
Johannes Berg0aaffa92010-05-05 15:28:27 +020094 superchan = tmp->vif.bss_conf.channel_type;
95 break;
96 case NL80211_CHAN_HT40PLUS:
97 WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
98 superchan = NL80211_CHAN_HT40PLUS;
99 break;
100 case NL80211_CHAN_HT40MINUS:
101 WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
102 superchan = NL80211_CHAN_HT40MINUS;
103 break;
104 }
105 }
106
107 switch (superchan) {
108 case NL80211_CHAN_NO_HT:
109 case NL80211_CHAN_HT20:
110 /*
111 * allow any change that doesn't go to no-HT
112 * (if it already is no-HT no change is needed)
113 */
114 if (chantype == NL80211_CHAN_NO_HT)
115 break;
116 superchan = chantype;
117 break;
118 case NL80211_CHAN_HT40PLUS:
119 case NL80211_CHAN_HT40MINUS:
120 /* allow smaller bandwidth and same */
121 if (chantype == NL80211_CHAN_NO_HT)
122 break;
123 if (chantype == NL80211_CHAN_HT20)
124 break;
125 if (superchan == chantype)
126 break;
127 result = false;
128 goto out;
129 }
130
131 local->_oper_channel_type = superchan;
132
133 if (sdata)
134 sdata->vif.bss_conf.channel_type = chantype;
135
136 result = true;
137 out:
138 mutex_unlock(&local->iflist_mtx);
139
140 return result;
141}