Quoting hwang <yyhymmh@xxxxxxxxx>:
I am first time use ath9k driver. I like to change the card to
Monitor mode. Can anyone tell which command does it?
I tried to use iwconfig, but failed.
Moving discussion from ath9k-devel@xxxxxxxxxxxxxxx to
linux-wireless@xxxxxxxxxxxxxxx, as it's a common problem for all
mac80211 based drivers.
Following code in net/mac80211/iface.c, ieee80211_if_change_type()
prevents setting monitor mode:
/* Setting ad-hoc mode on non-IBSS channel is not supported. */
if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)
return -EOPNOTSUPP;
The effect of the code exceeds the effect described by the comment, so
something must be wrong. I'm not running crda, so I guess I'm in the
"world" domain that doesn't prermit IBSS. But it should not disable
monitor mode.
A simple fix would be:
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 5abbc3f..b907482 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -699,7 +699,8 @@ int ieee80211_if_change_type(struct
ieee80211_sub_if_data *sdata,
return 0;
/* Setting ad-hoc mode on non-IBSS channel is not supported. */
- if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS)
+ if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
+ type == NL80211_IFTYPE_ADHOC)
return -EOPNOTSUPP;
/*
I've tested it, and it actually enables monitor mode. I remember Luis
mentioning that IEEE80211_CHAN_NO_IBSS means no beacons, so maybe
other modes need to be disabled (AP, maybe mesh), but there are no
beacons sent in the monitor mode.
--
Regards,
Pavel Roskin
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