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; | |
be0f4237 TP |
44 | case NL80211_IFTYPE_MESH_POINT: |
45 | if (!sdata->wdev.mesh_id_len) | |
46 | continue; | |
47 | break; | |
e9980e6d JB |
48 | default: |
49 | break; | |
50 | } | |
f444de05 JB |
51 | |
52 | return CHAN_MODE_FIXED; | |
53 | } | |
54 | ||
55 | return CHAN_MODE_UNDEFINED; | |
56 | } | |
57 | ||
58 | enum ieee80211_chan_mode | |
59 | ieee80211_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 | } | |
0aaffa9b | 70 | |
23a85b45 MK |
71 | static enum nl80211_channel_type |
72 | ieee80211_get_superchan(struct ieee80211_local *local, | |
73 | struct ieee80211_sub_if_data *sdata) | |
0aaffa9b | 74 | { |
0aaffa9b | 75 | enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT; |
23a85b45 | 76 | struct ieee80211_sub_if_data *tmp; |
0aaffa9b JB |
77 | |
78 | mutex_lock(&local->iflist_mtx); | |
0aaffa9b JB |
79 | list_for_each_entry(tmp, &local->interfaces, list) { |
80 | if (tmp == sdata) | |
81 | continue; | |
82 | ||
83 | if (!ieee80211_sdata_running(tmp)) | |
84 | continue; | |
85 | ||
86 | switch (tmp->vif.bss_conf.channel_type) { | |
87 | case NL80211_CHAN_NO_HT: | |
88 | case NL80211_CHAN_HT20: | |
9db372fd FF |
89 | if (superchan > tmp->vif.bss_conf.channel_type) |
90 | break; | |
91 | ||
0aaffa9b JB |
92 | superchan = tmp->vif.bss_conf.channel_type; |
93 | break; | |
94 | case NL80211_CHAN_HT40PLUS: | |
95 | WARN_ON(superchan == NL80211_CHAN_HT40MINUS); | |
96 | superchan = NL80211_CHAN_HT40PLUS; | |
97 | break; | |
98 | case NL80211_CHAN_HT40MINUS: | |
99 | WARN_ON(superchan == NL80211_CHAN_HT40PLUS); | |
100 | superchan = NL80211_CHAN_HT40MINUS; | |
101 | break; | |
102 | } | |
103 | } | |
23a85b45 | 104 | mutex_unlock(&local->iflist_mtx); |
0aaffa9b | 105 | |
23a85b45 MK |
106 | return superchan; |
107 | } | |
108 | ||
109 | static bool | |
110 | ieee80211_channel_types_are_compatible(enum nl80211_channel_type chantype1, | |
111 | enum nl80211_channel_type chantype2, | |
112 | enum nl80211_channel_type *compat) | |
113 | { | |
114 | /* | |
115 | * start out with chantype1 being the result, | |
116 | * overwriting later if needed | |
117 | */ | |
118 | if (compat) | |
119 | *compat = chantype1; | |
120 | ||
121 | switch (chantype1) { | |
0aaffa9b | 122 | case NL80211_CHAN_NO_HT: |
23a85b45 MK |
123 | if (compat) |
124 | *compat = chantype2; | |
125 | break; | |
0aaffa9b JB |
126 | case NL80211_CHAN_HT20: |
127 | /* | |
128 | * allow any change that doesn't go to no-HT | |
129 | * (if it already is no-HT no change is needed) | |
130 | */ | |
23a85b45 | 131 | if (chantype2 == NL80211_CHAN_NO_HT) |
0aaffa9b | 132 | break; |
23a85b45 MK |
133 | if (compat) |
134 | *compat = chantype2; | |
0aaffa9b JB |
135 | break; |
136 | case NL80211_CHAN_HT40PLUS: | |
137 | case NL80211_CHAN_HT40MINUS: | |
138 | /* allow smaller bandwidth and same */ | |
23a85b45 | 139 | if (chantype2 == NL80211_CHAN_NO_HT) |
0aaffa9b | 140 | break; |
23a85b45 | 141 | if (chantype2 == NL80211_CHAN_HT20) |
0aaffa9b | 142 | break; |
23a85b45 | 143 | if (chantype2 == chantype1) |
0aaffa9b | 144 | break; |
23a85b45 | 145 | return false; |
0aaffa9b JB |
146 | } |
147 | ||
23a85b45 MK |
148 | return true; |
149 | } | |
150 | ||
151 | bool ieee80211_set_channel_type(struct ieee80211_local *local, | |
152 | struct ieee80211_sub_if_data *sdata, | |
153 | enum nl80211_channel_type chantype) | |
154 | { | |
155 | enum nl80211_channel_type superchan; | |
156 | enum nl80211_channel_type compatchan; | |
157 | ||
158 | superchan = ieee80211_get_superchan(local, sdata); | |
159 | if (!ieee80211_channel_types_are_compatible(superchan, chantype, | |
160 | &compatchan)) | |
161 | return false; | |
162 | ||
163 | local->_oper_channel_type = compatchan; | |
0aaffa9b JB |
164 | |
165 | if (sdata) | |
166 | sdata->vif.bss_conf.channel_type = chantype; | |
167 | ||
23a85b45 | 168 | return true; |
0aaffa9b | 169 | |
0aaffa9b | 170 | } |