Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 1 | /* |
| 2 | * mac80211 - channel management |
| 3 | */ |
| 4 | |
Johannes Berg | 0aaffa9 | 2010-05-05 15:28:27 +0200 | [diff] [blame] | 5 | #include <linux/nl80211.h> |
Paul Stewart | 3117bbdb | 2012-03-13 07:46:18 -0700 | [diff] [blame^] | 6 | #include <net/cfg80211.h> |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 7 | #include "ieee80211_i.h" |
| 8 | |
Johannes Berg | 368a07d | 2010-05-28 14:26:23 +0200 | [diff] [blame] | 9 | static enum ieee80211_chan_mode |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 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 | |
Johannes Berg | 46a5eba | 2010-09-15 13:28:15 +0200 | [diff] [blame] | 15 | lockdep_assert_held(&local->iflist_mtx); |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 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 | |
Johannes Berg | e9980e6 | 2012-01-09 13:57:36 +0100 | [diff] [blame] | 24 | switch (sdata->vif.type) { |
| 25 | case NL80211_IFTYPE_MONITOR: |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 26 | continue; |
Johannes Berg | e9980e6 | 2012-01-09 13:57:36 +0100 | [diff] [blame] | 27 | case NL80211_IFTYPE_STATION: |
| 28 | if (!sdata->u.mgd.associated) |
| 29 | continue; |
| 30 | break; |
| 31 | case NL80211_IFTYPE_ADHOC: |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 32 | if (!sdata->u.ibss.ssid_len) |
| 33 | continue; |
| 34 | if (!sdata->u.ibss.fixed_channel) |
| 35 | return CHAN_MODE_HOPPING; |
Johannes Berg | e9980e6 | 2012-01-09 13:57:36 +0100 | [diff] [blame] | 36 | break; |
| 37 | case NL80211_IFTYPE_AP_VLAN: |
| 38 | /* will also have _AP interface */ |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 39 | continue; |
Johannes Berg | e9980e6 | 2012-01-09 13:57:36 +0100 | [diff] [blame] | 40 | case NL80211_IFTYPE_AP: |
| 41 | if (!sdata->u.ap.beacon) |
| 42 | continue; |
| 43 | break; |
| 44 | default: |
| 45 | break; |
| 46 | } |
Johannes Berg | f444de0 | 2010-05-05 15:25:02 +0200 | [diff] [blame] | 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 | } |
Johannes Berg | 0aaffa9 | 2010-05-05 15:28:27 +0200 | [diff] [blame] | 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: |
Felix Fietkau | 9db372f | 2011-03-11 21:45:51 +0100 | [diff] [blame] | 87 | if (superchan > tmp->vif.bss_conf.channel_type) |
| 88 | break; |
| 89 | |
Johannes Berg | 0aaffa9 | 2010-05-05 15:28:27 +0200 | [diff] [blame] | 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 | } |
Paul Stewart | 3117bbdb | 2012-03-13 07:46:18 -0700 | [diff] [blame^] | 138 | |
| 139 | /* |
| 140 | * ieee80211_get_tx_channel_type returns the channel type we should |
| 141 | * use for packet transmission, given the channel capability and |
| 142 | * whatever regulatory flags we have been given. |
| 143 | */ |
| 144 | enum nl80211_channel_type ieee80211_get_tx_channel_type( |
| 145 | struct ieee80211_local *local, |
| 146 | enum nl80211_channel_type channel_type) |
| 147 | { |
| 148 | switch (channel_type) { |
| 149 | case NL80211_CHAN_HT40PLUS: |
| 150 | if (local->hw.conf.channel->flags & |
| 151 | IEEE80211_CHAN_NO_HT40PLUS) |
| 152 | return NL80211_CHAN_HT20; |
| 153 | break; |
| 154 | case NL80211_CHAN_HT40MINUS: |
| 155 | if (local->hw.conf.channel->flags & |
| 156 | IEEE80211_CHAN_NO_HT40MINUS) |
| 157 | return NL80211_CHAN_HT20; |
| 158 | break; |
| 159 | default: |
| 160 | break; |
| 161 | } |
| 162 | return channel_type; |
| 163 | } |