Commit | Line | Data |
---|---|---|
f444de05 JB |
1 | /* |
2 | * mac80211 - channel management | |
3 | */ | |
4 | ||
0aaffa9b | 5 | #include <linux/nl80211.h> |
3117bbdb | 6 | #include <net/cfg80211.h> |
f444de05 JB |
7 | #include "ieee80211_i.h" |
8 | ||
368a07d2 | 9 | static enum ieee80211_chan_mode |
f444de05 JB |
10 | __ieee80211_get_channel_mode(struct ieee80211_local *local, |
11 | struct ieee80211_sub_if_data *ignore) | |
12 | { | |
13 | struct ieee80211_sub_if_data *sdata; | |
14 | ||
46a5ebaf | 15 | lockdep_assert_held(&local->iflist_mtx); |
f444de05 JB |
16 | |
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 | ||
e9980e6d JB |
24 | switch (sdata->vif.type) { |
25 | case NL80211_IFTYPE_MONITOR: | |
f444de05 | 26 | continue; |
e9980e6d JB |
27 | case NL80211_IFTYPE_STATION: |
28 | if (!sdata->u.mgd.associated) | |
29 | continue; | |
30 | break; | |
31 | case NL80211_IFTYPE_ADHOC: | |
f444de05 JB |
32 | if (!sdata->u.ibss.ssid_len) |
33 | continue; | |
34 | if (!sdata->u.ibss.fixed_channel) | |
35 | return CHAN_MODE_HOPPING; | |
e9980e6d JB |
36 | break; |
37 | case NL80211_IFTYPE_AP_VLAN: | |
38 | /* will also have _AP interface */ | |
f444de05 | 39 | continue; |
e9980e6d JB |
40 | case NL80211_IFTYPE_AP: |
41 | if (!sdata->u.ap.beacon) | |
42 | continue; | |
43 | break; | |
44 | default: | |
45 | break; | |
46 | } | |
f444de05 JB |
47 | |
48 | return CHAN_MODE_FIXED; | |
49 | } | |
50 | ||
51 | return CHAN_MODE_UNDEFINED; | |
52 | } | |
53 | ||
54 | enum ieee80211_chan_mode | |
55 | ieee80211_get_channel_mode(struct ieee80211_local *local, | |
56 | struct ieee80211_sub_if_data *ignore) | |
57 | { | |
58 | enum ieee80211_chan_mode mode; | |
59 | ||
60 | mutex_lock(&local->iflist_mtx); | |
61 | mode = __ieee80211_get_channel_mode(local, ignore); | |
62 | mutex_unlock(&local->iflist_mtx); | |
63 | ||
64 | return mode; | |
65 | } | |
0aaffa9b JB |
66 | |
67 | bool ieee80211_set_channel_type(struct ieee80211_local *local, | |
68 | struct ieee80211_sub_if_data *sdata, | |
69 | enum nl80211_channel_type chantype) | |
70 | { | |
71 | struct ieee80211_sub_if_data *tmp; | |
72 | enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT; | |
73 | bool result; | |
74 | ||
75 | mutex_lock(&local->iflist_mtx); | |
76 | ||
77 | list_for_each_entry(tmp, &local->interfaces, list) { | |
78 | if (tmp == sdata) | |
79 | continue; | |
80 | ||
81 | if (!ieee80211_sdata_running(tmp)) | |
82 | continue; | |
83 | ||
84 | switch (tmp->vif.bss_conf.channel_type) { | |
85 | case NL80211_CHAN_NO_HT: | |
86 | case NL80211_CHAN_HT20: | |
9db372fd FF |
87 | if (superchan > tmp->vif.bss_conf.channel_type) |
88 | break; | |
89 | ||
0aaffa9b JB |
90 | superchan = tmp->vif.bss_conf.channel_type; |
91 | break; | |
92 | case NL80211_CHAN_HT40PLUS: | |
93 | WARN_ON(superchan == NL80211_CHAN_HT40MINUS); | |
94 | superchan = NL80211_CHAN_HT40PLUS; | |
95 | break; | |
96 | case NL80211_CHAN_HT40MINUS: | |
97 | WARN_ON(superchan == NL80211_CHAN_HT40PLUS); | |
98 | superchan = NL80211_CHAN_HT40MINUS; | |
99 | break; | |
100 | } | |
101 | } | |
102 | ||
103 | switch (superchan) { | |
104 | case NL80211_CHAN_NO_HT: | |
105 | case NL80211_CHAN_HT20: | |
106 | /* | |
107 | * allow any change that doesn't go to no-HT | |
108 | * (if it already is no-HT no change is needed) | |
109 | */ | |
110 | if (chantype == NL80211_CHAN_NO_HT) | |
111 | break; | |
112 | superchan = chantype; | |
113 | break; | |
114 | case NL80211_CHAN_HT40PLUS: | |
115 | case NL80211_CHAN_HT40MINUS: | |
116 | /* allow smaller bandwidth and same */ | |
117 | if (chantype == NL80211_CHAN_NO_HT) | |
118 | break; | |
119 | if (chantype == NL80211_CHAN_HT20) | |
120 | break; | |
121 | if (superchan == chantype) | |
122 | break; | |
123 | result = false; | |
124 | goto out; | |
125 | } | |
126 | ||
127 | local->_oper_channel_type = superchan; | |
128 | ||
129 | if (sdata) | |
130 | sdata->vif.bss_conf.channel_type = chantype; | |
131 | ||
132 | result = true; | |
133 | out: | |
134 | mutex_unlock(&local->iflist_mtx); | |
135 | ||
136 | return result; | |
137 | } |