projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f444de05 JB |
1 | /* |
| 2 | * mac80211 - channel management | |
| 3 | */ | |
| 4 | ||
| 0aaffa9b | 5 | #include <linux/nl80211.h> |
| f444de05 JB |
6 | #include "ieee80211_i.h" |
| 7 | ||
| 368a07d2 | 8 | static enum ieee80211_chan_mode |
| f444de05 JB |
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 | ||
| 14 | WARN_ON(!mutex_is_locked(&local->iflist_mtx)); | |
| 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 | ||
| 47 | enum ieee80211_chan_mode | |
| 48 | ieee80211_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 | } | |
| 0aaffa9b JB |
59 | |
| 60 | bool 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 | } |