Factorise the common parts of the in/out filtering functions. This also
fixes a bug with filtered out routes, which in babeld are signalled by
a filter returing INFINITY, not -1.
Babelz is the last version of the stand-alone babel daemon. In
particular, it use multiple channels to diminuate
interferences. Please refer to this one for more details.
Including system headers is not necessary with zebra.h included and
sometimes results in "__ASSERT_FUNCTION redefined" compilation warning.
* babeld.c
* babel_distribute_update_interface(): make static
* babel_interface.c
* interface_config_write(): unused 'babel_ifp'
* don't include system headers
* message.c
* send_request(): unused 'babel_ifp'
* send_multihop_request(): idem
* don't include system headers
* route.c: don't include system headers
* xroute.c: idem
* source.h: newline at EOF
* message.h: idem
* Initial import of the Babel routing protocol, ported to Quagga.
* LICENCE: Update the original LICENCE file to include all known potentially
applicable copyright claims. Ask that any future contributors to babeld/
grant MIT/X11 licence to their work.
* *.{c,h}: Add GPL headers, in according with the SFLC guidance on
dealing with potentially mixed GPL/other licensed work, at:
https://www.softwarefreedom.org/resources/2007/gpl-non-gpl-collaboration.html
