Hi all,
I'm writing a fake wifi driver (basically a proxy between two devices)
which uses nl80211 to talk to a real wifi device, and it mostly works,
but I have a problem with the scanning interface.
From userland, after sending the NL80211_CMD_GET_SCAN the results come
in as a single netlink read (split up and the handler gets called once
for each) and I know it is finished after that read, but I'm triggering
the scan from a different kernel driver (so driverA -> driverB -> genl
to userland -> nl80211 -> userland -> driverB -> driverA). I don't want
to modify the nl80211 message (with the theory that i could go driverB
-> nl80211 directly later) but I have no way to know when scanning
results have been fully sent. (Or even how many results to expect so I
can finally call cfg80211_scan_done() in driverA when that many stations
have been reported from nl80211).
Is there any way to do what I want? Is it possible to know when we get
the NLMSG_DONE type from the post_doit?
Is it possible to figure it out using a combination of the pre_doit()
and post_doit() callbacks?
The really nasty hack I'm using currently is having a timeout of 1s
after I receive a NL80211_CMD_GET_SCAN (resetting the timeout for each
one) but I'm praying there is a nicer way?
Thanks.
Jonathan Gordon
P.S yes, the design is convoluted, but there is no other way to do what
we want. :)
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