outgoing interface field

[Johannes Berg <johannes-cdvu00un1VgdHxzADdlk8Q@public.gmane.org>]

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For our particular implementation of AP mode with hostapd in Linux, we
are using radiotap-injection interfaces to send management frames.

Now, 802.11w (encrypted management frames) requires that those frames
are encrypted, due to key management issues we need to do that in the
kernel. This means we can no longer simply inject the frames, we need to
know, in the kernel, which interface to search for the key, since
multiple virtual AP interfaces/BSSes may be configured on a single PHY.

This requires that we have a radiotap field indicating the outgoing
interface to use for such key lookups. Further uses would be to use, for
data frames, the fragmentation/RTS threshold from the given interface.

I don't, off-hand, see any other OS requiring this, so I'm shopping
around asking vendors if I can have part of their vendor OUI namespace
(one of the sub-namespaces) for Linux, but if anybody sees value in such
a field for other OSes we can also add it to the standard.

Thoughts?

johannes

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