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nl80211: advertise HT/VHT channel limitations

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When drivers or regulatory have limitations on
40, 80 or 160 MHz channels, advertise these to
userspace via nl80211. Also add a new feature
flag to let userspace know this is supported.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-12-12 17:59:39 +01:00
parent c7a6ee27ab
commit 50640f1693
3 changed files with 31 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
include/uapi/linux/nl80211.h
View File

@ -2041,6 +2041,16 @@ enum nl80211_band_attr {
* (enum nl80211_dfs_state)
* @NL80211_FREQUENCY_ATTR_DFS_TIME: time in miliseconds for how long
* this channel is in this DFS state.
* @NL80211_FREQUENCY_ATTR_NO_HT40_MINUS: HT40- isn't possible with this
* channel as the control channel
* @NL80211_FREQUENCY_ATTR_NO_HT40_PLUS: HT40+ isn't possible with this
* channel as the control channel
* @NL80211_FREQUENCY_ATTR_NO_80MHZ: any 80 MHz channel using this channel
* as the primary or any of the secondary channels isn't possible,
* this includes 80+80 channels
* @NL80211_FREQUENCY_ATTR_NO_160MHZ: any 160 MHz (but not 80+80) channel
* using this channel as the primary or any of the secondary channels
* isn't possible
* @NL80211_FREQUENCY_ATTR_MAX: highest frequency attribute number
* currently defined
* @__NL80211_FREQUENCY_ATTR_AFTER_LAST: internal use
@ -2055,6 +2065,10 @@ enum nl80211_frequency_attr {
NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
NL80211_FREQUENCY_ATTR_DFS_STATE,
NL80211_FREQUENCY_ATTR_DFS_TIME,
NL80211_FREQUENCY_ATTR_NO_HT40_MINUS,
NL80211_FREQUENCY_ATTR_NO_HT40_PLUS,
NL80211_FREQUENCY_ATTR_NO_80MHZ,
NL80211_FREQUENCY_ATTR_NO_160MHZ,
/* keep last */
__NL80211_FREQUENCY_ATTR_AFTER_LAST,
@ -3421,6 +3435,8 @@ enum nl80211_ap_sme_features {
* Note that even for drivers that support this, the default is to add
* stations in authenticated/associated state, so to add unauthenticated
* stations the authenticated/associated bits have to be set in the mask.
* @NL80211_FEATURE_ADVERTISE_CHAN_LIMITS: cfg80211 advertises channel limits
* (HT40, VHT 80/160 MHz) if this flag is set
*/
enum nl80211_feature_flags {
NL80211_FEATURE_SK_TX_STATUS = 1 << 0,
@ -3437,6 +3453,7 @@ enum nl80211_feature_flags {
NL80211_FEATURE_P2P_GO_CTWIN = 1 << 11,
NL80211_FEATURE_P2P_GO_OPPPS = 1 << 12,
NL80211_FEATURE_FULL_AP_CLIENT_STATE = 1 << 13,
NL80211_FEATURE_ADVERTISE_CHAN_LIMITS = 1 << 14,
};
/**

3
net/wireless/core.c
View File

@ -367,7 +367,8 @@ struct wiphy *wiphy_new(const struct cfg80211_ops *ops, int sizeof_priv)
rdev->wiphy.rts_threshold = (u32) -1;
rdev->wiphy.coverage_class = 0;
rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH;
rdev->wiphy.features = NL80211_FEATURE_SCAN_FLUSH |
NL80211_FEATURE_ADVERTISE_CHAN_LIMITS;
return &rdev->wiphy;
}

12
net/wireless/nl80211.c
View File

@ -562,6 +562,18 @@ static int nl80211_msg_put_channel(struct sk_buff *msg,
if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_TIME, time))
goto nla_put_failure;
}
if ((chan->flags & IEEE80211_CHAN_NO_HT40MINUS) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_HT40_MINUS))
goto nla_put_failure;
if ((chan->flags & IEEE80211_CHAN_NO_HT40PLUS) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_HT40_PLUS))
goto nla_put_failure;
if ((chan->flags & IEEE80211_CHAN_NO_80MHZ) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_80MHZ))
goto nla_put_failure;
if ((chan->flags & IEEE80211_CHAN_NO_160MHZ) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_160MHZ))
goto nla_put_failure;
if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
DBM_TO_MBM(chan->max_power)))