Re: Route caching ?

Ivo Vachkov wrote:
Does FreeBSD rtalloc*() (or any other) functions implement route
caching and how ? I looked at the code but it's not exactly easiest
thing to read / understand :)
Not really, at least, not in the way one would think. rtalloc() is a legacy function.

ip_output() will still call rtalloc() if you pass it a filled out 'struct route', a structure which is not a route, but an internal request to look up a route.

This is a wrapper for rtalloc_ign(), which in turn is a wrapper for rtalloc1(), the function which does the actual lookup.

rtalloc_ign() is pretty straightforward. Note however that this approach only checks the RTF_UP flag and ifp, nothing more. This makes it suitable for implementing floating statics, but nothing more dynamic than that.

regards,
BMS
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