[Bug 237973] pf: implement egress keyword to simplify rules across different hardware

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237973

--- Comment #19 from Alexander V. Chernikov <melifaro@FreeBSD.org> ---
(In reply to Goran Mekić from comment #18)
The rest is the prefix information, in sockaddr form.

Basically, rtm_addrs contains a bitmask of sockaddrs available, and these
remaining bytes are 4/8-bytes aligned 'struct sockaddr_in[6]', representing
dst,netmask and gateway. You can look at the example parsing code here:
https://github.com/freebsd/freebsd-src/blob/main/sys/net/rtsock.c#L1311

Interface is present in rtm_ifindex (and you can use if_indextoname()). rtsock
sockets are bound the the fib of the process at the time of socket creation, so
the fib is the process fib. If you need to monitor more than one fib, you can
either create multiple processes or create multiple rtsock sockets, using
setfib() calls prior to calling socket().

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