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review.evervolv.com / android_kernel_htc_msm8960 / d9c76f99c2a79feb413e3e751362d59c0f5323f6 / . / net / mac80211 / chan.c
blob: 5b24740fc0b0698c65cc1141c981631160a1efc8 [file] [log] [blame]
Johannes Bergf444de02010-05-05 15:25:02 +0200[diff] [blame]1/*
2 * mac80211 - channel management
3 */
4
Johannes Berg0aaffa92010-05-05 15:28:27 +0200[diff] [blame]5#include <linux/nl80211.h>
Johannes Bergf444de02010-05-05 15:25:02 +0200[diff] [blame]6#include "ieee80211_i.h"
7
Johannes Berg368a07d2010-05-28 14:26:23 +0200[diff] [blame]8static enum ieee80211_chan_mode
Johannes Bergf444de02010-05-05 15:25:02 +0200[diff] [blame]9__ieee80211_get_channel_mode(struct ieee80211_local *local,
10 struct ieee80211_sub_if_data *ignore)
11{
12 struct ieee80211_sub_if_data *sdata;
13
Johannes Berg46a5eba2010-09-15 13:28:15 +0200[diff] [blame]14 lockdep_assert_held(&local->iflist_mtx);
Johannes Bergf444de02010-05-05 15:25:02 +0200[diff] [blame]15
16 list_for_each_entry(sdata, &local->interfaces, list) {
17 if (sdata == ignore)
18 continue;
19
20 if (!ieee80211_sdata_running(sdata))
21 continue;
22
23 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
24 continue;
25
26 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
27 !sdata->u.mgd.associated)
28 continue;
29
30 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
31 if (!sdata->u.ibss.ssid_len)
32 continue;
33 if (!sdata->u.ibss.fixed_channel)
34 return CHAN_MODE_HOPPING;
35 }
36
37 if (sdata->vif.type == NL80211_IFTYPE_AP &&
38 !sdata->u.ap.beacon)
39 continue;
40
41 return CHAN_MODE_FIXED;
42 }
43
44 return CHAN_MODE_UNDEFINED;
45}
46
47enum ieee80211_chan_mode
48ieee80211_get_channel_mode(struct ieee80211_local *local,
49 struct ieee80211_sub_if_data *ignore)
50{
51 enum ieee80211_chan_mode mode;
52
53 mutex_lock(&local->iflist_mtx);
54 mode = __ieee80211_get_channel_mode(local, ignore);
55 mutex_unlock(&local->iflist_mtx);
56
57 return mode;
58}
Johannes Berg0aaffa92010-05-05 15:28:27 +0200[diff] [blame]59
60bool ieee80211_set_channel_type(struct ieee80211_local *local,
61 struct ieee80211_sub_if_data *sdata,
62 enum nl80211_channel_type chantype)
63{
64 struct ieee80211_sub_if_data *tmp;
65 enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
66 bool result;
67
68 mutex_lock(&local->iflist_mtx);
69
70 list_for_each_entry(tmp, &local->interfaces, list) {
71 if (tmp == sdata)
72 continue;
73
74 if (!ieee80211_sdata_running(tmp))
75 continue;
76
77 switch (tmp->vif.bss_conf.channel_type) {
78 case NL80211_CHAN_NO_HT:
79 case NL80211_CHAN_HT20:
80 superchan = tmp->vif.bss_conf.channel_type;
81 break;
82 case NL80211_CHAN_HT40PLUS:
83 WARN_ON(superchan == NL80211_CHAN_HT40MINUS);
84 superchan = NL80211_CHAN_HT40PLUS;
85 break;
86 case NL80211_CHAN_HT40MINUS:
87 WARN_ON(superchan == NL80211_CHAN_HT40PLUS);
88 superchan = NL80211_CHAN_HT40MINUS;
89 break;
90 }
91 }
92
93 switch (superchan) {
94 case NL80211_CHAN_NO_HT:
95 case NL80211_CHAN_HT20:
96 /*
97 * allow any change that doesn't go to no-HT
98 * (if it already is no-HT no change is needed)
99 */
100 if (chantype == NL80211_CHAN_NO_HT)
101 break;
102 superchan = chantype;
103 break;
104 case NL80211_CHAN_HT40PLUS:
105 case NL80211_CHAN_HT40MINUS:
106 /* allow smaller bandwidth and same */
107 if (chantype == NL80211_CHAN_NO_HT)
108 break;
109 if (chantype == NL80211_CHAN_HT20)
110 break;
111 if (superchan == chantype)
112 break;
113 result = false;
114 goto out;
115 }
116
117 local->_oper_channel_type = superchan;
118
119 if (sdata)
120 sdata->vif.bss_conf.channel_type = chantype;
121
122 result = true;
123 out:
124 mutex_unlock(&local->iflist_mtx);
125
126 return result;
127}