[Bug 202038] source address based routing without pf or ipfw

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202038

            Bug ID: 202038
           Summary: source address based routing without pf or ipfw
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: n+freebsd at nirf.de

It is currently not possible to do source address based routing without
firewalls such as pf or ipfw. I think that in typical multihoming scenarios
(i.e. mobile devices) it doesn't make sense to have a static firewall
configuration file or have some daemon dynamically mess with my firewall rules.
I suggest making it possible to configure one routing table per address instead
of only one per interface with ifconfig. This probably would make automatic
multihoming configuration with RA or DHCPv6 easy to implement. Linux solves
this problem the same way.
For Multipath TCP, proper multihoming support will become necessary.

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