Announcing ethernet link state changes via route socket

[Sepherosa Ziehau]

On 3/16/07, Hasso Tepper <hasso at estpak.ee> wrote:
Announcing link state changes to the userspace via route socket is critical
to get routing related applications to work correctly - routing protocols
are most important, but other applications might benefit from it as well.
This code is adapted from OpenBSD and is only the first basic step in path
to get correct support. Only em(4) is tested because I don't have hardware
to test others, although bge(4) might get my attention as well in the
future.
Committed!  Thanks!

Best Regards,
sephe
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