Headroom for bridging and wireless

The madwifi driver (for Atheros cards) uses sk_buff's directly in its xmit
code.  When using WEP, a 4 byte header is prepended to the data using
skb_push().  Since normal ethernet drivers don't anticipate the need for
this, a call to skb_realloc_headroom() is needed for all packets crossing
the bridge from ethernet to wireless.

How hard would it be to add some logic in the bridge code to supply extra
headroom in the sk_buff allocator?  I'm thinking it could query each network
device in the system for its headroom requirements and use the max.  Or it
could recognize which interfaces are in bridging mode and only ask them.  Or
something even more intelligent.

-- 
A computer without Microsoft software is like a fish without a bicycle.

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