projects / linux.git / blame
| 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 JB |
70 | |
| 71 | bool 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: | |
| 9db372fd FF |
91 | if (superchan > tmp->vif.bss_conf.channel_type) |
| 92 | break; | |
| 93 | ||
| 0aaffa9b JB |
94 | 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 | } |