xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cfg80211: Add attributes describing prohibited channel bandwidth

Browse Source 
Since there are frequency bands (e.g. 5.9GHz) allowing channels
with only 10 or 5 MHz bandwidth, this patch adds attributes that
allow keeping track about this information.

When channel attributes are reported to user-space, make sure to
not break old tools, i.e. if the 'split wiphy dump' is enabled,
report the extra attributes (if present) describing the bandwidth
restrictions.  If the 'split wiphy dump' is not enabled,
completely omit those channels that have flags set to either
IEEE80211_CHAN_NO_10MHZ or IEEE80211_CHAN_NO_20MHZ.

Add the check for new bandwidth restriction flags in
cfg80211_chandef_usable() to comply with the restrictions.

Signed-off-by: Rostislav Lisovy <rostislav.lisovy@fel.cvut.cz>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Rostislav Lisovy
2014-04-15 14:37:55 +02:00
committed by Johannes Berg
parent 8bd811aa6c
commit ea077c1cea
4 changed files with 27 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
net/wireless/nl80211.c
View File

@@ -567,6 +567,13 @@ static int nl80211_msg_put_channel(struct sk_buff *msg,
struct ieee80211_channel *chan,
bool large)
{
/* Some channels must be completely excluded from the
* list to protect old user-space tools from breaking
*/
if (!large && chan->flags &
(IEEE80211_CHAN_NO_10MHZ | IEEE80211_CHAN_NO_20MHZ))
return 0;
if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_FREQ,
chan->center_freq))
goto nla_put_failure;
@@ -620,6 +627,12 @@ static int nl80211_msg_put_channel(struct sk_buff *msg,
if ((chan->flags & IEEE80211_CHAN_GO_CONCURRENT) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_GO_CONCURRENT))
goto nla_put_failure;
if ((chan->flags & IEEE80211_CHAN_NO_20MHZ) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_20MHZ))
goto nla_put_failure;
if ((chan->flags & IEEE80211_CHAN_NO_10MHZ) &&
nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_10MHZ))
goto nla_put_failure;
}
if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,