Date: Thu, 18 Aug 2005 18:06:42 +0200 From: Max Laier <max@love2party.net> To: freebsd-net@freebsd.org Cc: shiner chen <shiner_chen@yahoo.com.cn> Subject: Re: about the implement and design of the pfil interface Message-ID: <200508181806.53793.max@love2party.net> In-Reply-To: <20050818120256.80007.qmail@web15501.mail.cnb.yahoo.com> References: <20050818120256.80007.qmail@web15501.mail.cnb.yahoo.com>
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[-- Attachment #1 --] On Thursday 18 August 2005 14:02, shiner chen wrote: > Recently ,I read the code of the pfil interface was designed and > implemented by Matthew R. Green. I want to get the Diagram illustrating > the flow of TCP/IP packets through the various stages introduced by pfil > interface and the document about the implement and design of the > pfilinterface. Who can help me ? thanks!! In FreeBSD we only have pfil_hooks for IP level packets. While the instrumentation is there to provide other hook points with the pfil API it hasn't happend as it would result in performance degradation (at least one function call/memory read per hook point). Unless a specific application makes it worthwhile to add another hookup point, I don't think it's worthwhile to provide such. There is some work going on to provide L2 hooks, however. More information about FreeBSD's pfil implementation can be found in src/sys/net/pfil.? and the pfil(9) manpage. -- /"\ Best regards, | mlaier@freebsd.org \ / Max Laier | ICQ #67774661 X http://pf4freebsd.love2party.net/ | mlaier@EFnet / \ ASCII Ribbon Campaign | Against HTML Mail and News [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQBDBLIdXyyEoT62BG0RAnmAAJ0Wq5woq/ruE4z3LckVNgUV9q1Y6QCdEBZr qyU9dq9L/3L9rZ0nooltjrU= =T2Mc -----END PGP SIGNATURE-----
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