wpa_supplicant MAC address randomisation and per network

Hi all,

With the mac_addr=1 option, you can enable MAC-address randomisation.
This randomises the MAC address for every ESS connection, so when
connecting to the same network after disconnecting, you will have
another MAC address. I would like to hardcode an address per network:
this could be an option per network: if the option is not there, it
takes the global option (either the default MAC address, or a randomly
generated MAC address if it is enabled).

I want to do this to accomplish 2 goals: have MAC address
randomisation, so I can't be tracked via the MAC address, and still
have a static MAC address on networks that need it (networks with a
static DHCP leases).

I looked into the sourcecode, and saw the wpa_drv_set_mac_addr in
wpa_supplicant.c, but I don't really know how to go about
implementing my patch and submitting it: I know C, but I don't know
what files should have what functions.

Kind regards