Date: Fri, 27 Feb 2004 09:53:22 +0100 From: des@des.no (Dag-Erling =?iso-8859-1?q?Sm=F8rgrav?=) To: Luigi Rizzo <rizzo@icir.org> Cc: Sam Leffler <sam@errno.com> Subject: Re: cvs commit: src/sys/contrib/pf/net if_pflog.c if_pflog.h if_pfsync.c if_pfsync.h pf.c pf_ioctl.c pf_norm.c pf_osfp.c pf_table.c pfvar.h src/sys/contrib/pf/netinet in4_cksum.c Message-ID: <xzphdxc29a5.fsf@dwp.des.no> In-Reply-To: <20040227004602.A73084@xorpc.icir.org> (Luigi Rizzo's message of "Fri, 27 Feb 2004 00:46:02 -0800") References: <200402260234.i1Q2YDx1014240@repoman.freebsd.org> <20040226060126.GA70201@troutmask.apl.washington.edu> <20040226080517.GA29763@cat.robbins.dropbear.id.au> <20040226015016.B23674@xorpc.icir.org> <403DC956.8EA364B2@freebsd.org> <20040226071123.A31631@xorpc.icir.org> <565913D0-68E2-11D8-AE91-000A95AD0668@errno.com> <xzpptc10vvv.fsf@dwp.des.no> <20040227083630.GC54056@regency.nsu.ru> <20040227004602.A73084@xorpc.icir.org>
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Luigi Rizzo <rizzo@icir.org> writes: > I believe this (convert the entire networking stack to netgraph > nodes) is completely unfeasible. It shouldn't be. Open any textbook on computer networking and you'll find that netgraph is the canonical way to organize a protocol stack. > There are interactions among subsystems all over the place. Otherwise known as "layering violations" and "bugs". > The routing subsystem is used by all protocols at different > layers (arp, ipv4 and ipv6, probably more). TCP knows it runs > on top of IP and pokes into its data structures below. It also > plays with the socket buffers on the layer above. Repeat after me: "layering violations" DES --=20 Dag-Erling Sm=F8rgrav - des@des.no
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