Commit | Line | Data |
---|---|---|
59bbb6f7 JB |
1 | /* |
2 | * This file contains helper code to handle channel | |
3 | * settings and keeping track of what is possible at | |
4 | * any point in time. | |
5 | * | |
6 | * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> | |
7 | */ | |
8 | ||
54858ee5 | 9 | #include <linux/export.h> |
59bbb6f7 JB |
10 | #include <net/cfg80211.h> |
11 | #include "core.h" | |
12 | ||
9588bbd5 JM |
13 | struct ieee80211_channel * |
14 | rdev_freq_to_chan(struct cfg80211_registered_device *rdev, | |
59bbb6f7 JB |
15 | int freq, enum nl80211_channel_type channel_type) |
16 | { | |
17 | struct ieee80211_channel *chan; | |
18 | struct ieee80211_sta_ht_cap *ht_cap; | |
59bbb6f7 JB |
19 | |
20 | chan = ieee80211_get_channel(&rdev->wiphy, freq); | |
21 | ||
22 | /* Primary channel not allowed */ | |
23 | if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) | |
9588bbd5 | 24 | return NULL; |
59bbb6f7 JB |
25 | |
26 | if (channel_type == NL80211_CHAN_HT40MINUS && | |
27 | chan->flags & IEEE80211_CHAN_NO_HT40MINUS) | |
9588bbd5 | 28 | return NULL; |
59bbb6f7 JB |
29 | else if (channel_type == NL80211_CHAN_HT40PLUS && |
30 | chan->flags & IEEE80211_CHAN_NO_HT40PLUS) | |
9588bbd5 | 31 | return NULL; |
59bbb6f7 JB |
32 | |
33 | ht_cap = &rdev->wiphy.bands[chan->band]->ht_cap; | |
34 | ||
35 | if (channel_type != NL80211_CHAN_NO_HT) { | |
36 | if (!ht_cap->ht_supported) | |
9588bbd5 | 37 | return NULL; |
59bbb6f7 | 38 | |
aed8e1f9 HS |
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)) | |
9588bbd5 | 42 | return NULL; |
59bbb6f7 JB |
43 | } |
44 | ||
9588bbd5 JM |
45 | return chan; |
46 | } | |
47 | ||
294a20e0 | 48 | bool cfg80211_can_beacon_sec_chan(struct wiphy *wiphy, |
54858ee5 AS |
49 | struct ieee80211_channel *chan, |
50 | enum nl80211_channel_type channel_type) | |
9236d838 LR |
51 | { |
52 | struct ieee80211_channel *sec_chan; | |
53 | int diff; | |
54 | ||
55 | switch (channel_type) { | |
56 | case NL80211_CHAN_HT40PLUS: | |
57 | diff = 20; | |
09a02fdb | 58 | break; |
9236d838 LR |
59 | case NL80211_CHAN_HT40MINUS: |
60 | diff = -20; | |
09a02fdb | 61 | break; |
9236d838 | 62 | default: |
d58e7e37 | 63 | return true; |
9236d838 LR |
64 | } |
65 | ||
66 | sec_chan = ieee80211_get_channel(wiphy, chan->center_freq + diff); | |
67 | if (!sec_chan) | |
68 | return false; | |
69 | ||
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)) | |
75 | return false; | |
76 | ||
77 | return true; | |
78 | } | |
54858ee5 | 79 | EXPORT_SYMBOL(cfg80211_can_beacon_sec_chan); |
9236d838 | 80 | |
e8c9bd5b JB |
81 | int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, |
82 | int freq, enum nl80211_channel_type chantype) | |
9588bbd5 JM |
83 | { |
84 | struct ieee80211_channel *chan; | |
9588bbd5 | 85 | |
e8c9bd5b | 86 | if (!rdev->ops->set_monitor_channel) |
9588bbd5 | 87 | return -EOPNOTSUPP; |
4f03c1ed MK |
88 | if (!cfg80211_has_monitors_only(rdev)) |
89 | return -EBUSY; | |
9588bbd5 | 90 | |
e8c9bd5b | 91 | chan = rdev_freq_to_chan(rdev, freq, chantype); |
9588bbd5 JM |
92 | if (!chan) |
93 | return -EINVAL; | |
94 | ||
4290cb4b | 95 | return rdev->ops->set_monitor_channel(&rdev->wiphy, chan, chantype); |
59bbb6f7 | 96 | } |
26ab9a0c MK |
97 | |
98 | void | |
8e95ea49 | 99 | cfg80211_get_chan_state(struct wireless_dev *wdev, |
26ab9a0c MK |
100 | struct ieee80211_channel **chan, |
101 | enum cfg80211_chan_mode *chanmode) | |
102 | { | |
103 | *chan = NULL; | |
104 | *chanmode = CHAN_MODE_UNDEFINED; | |
105 | ||
26ab9a0c MK |
106 | ASSERT_WDEV_LOCK(wdev); |
107 | ||
108 | if (!netif_running(wdev->netdev)) | |
109 | return; | |
110 | ||
111 | switch (wdev->iftype) { | |
112 | case NL80211_IFTYPE_ADHOC: | |
113 | if (wdev->current_bss) { | |
114 | *chan = wdev->current_bss->pub.channel; | |
115 | *chanmode = wdev->ibss_fixed | |
116 | ? CHAN_MODE_SHARED | |
117 | : CHAN_MODE_EXCLUSIVE; | |
118 | return; | |
119 | } | |
120 | case NL80211_IFTYPE_STATION: | |
121 | case NL80211_IFTYPE_P2P_CLIENT: | |
122 | if (wdev->current_bss) { | |
123 | *chan = wdev->current_bss->pub.channel; | |
124 | *chanmode = CHAN_MODE_SHARED; | |
125 | return; | |
126 | } | |
127 | break; | |
128 | case NL80211_IFTYPE_AP: | |
129 | case NL80211_IFTYPE_P2P_GO: | |
f53594a0 FF |
130 | if (wdev->beacon_interval) { |
131 | *chan = wdev->channel; | |
132 | *chanmode = CHAN_MODE_SHARED; | |
133 | } | |
134 | return; | |
26ab9a0c | 135 | case NL80211_IFTYPE_MESH_POINT: |
f53594a0 FF |
136 | if (wdev->mesh_id_len) { |
137 | *chan = wdev->channel; | |
138 | *chanmode = CHAN_MODE_SHARED; | |
139 | } | |
26ab9a0c MK |
140 | return; |
141 | case NL80211_IFTYPE_MONITOR: | |
142 | case NL80211_IFTYPE_AP_VLAN: | |
143 | case NL80211_IFTYPE_WDS: | |
144 | /* these interface types don't really have a channel */ | |
145 | return; | |
146 | case NL80211_IFTYPE_UNSPECIFIED: | |
147 | case NUM_NL80211_IFTYPES: | |
148 | WARN_ON(1); | |
149 | } | |
150 | ||
151 | return; | |
152 | } |