Date: Wed, 22 Aug 2007 15:25:35 +0100 From: "Bruce M. Simpson" <bms@FreeBSD.org> To: Ivo Vachkov <ivo.vachkov@gmail.com> Cc: freebsd-net <freebsd-net@freebsd.org> Subject: Re: Route caching ? Message-ID: <46CC475F.8030505@FreeBSD.org> In-Reply-To: <f85d6aa70708220003le893770uca9ceea467d85618@mail.gmail.com>
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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, BMShome | help
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