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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--nextPart6337274.4qFF2rcy3S Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline 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=20 instrumentation is there to provide other hook points with the pfil API it= =20 hasn't happend as it would result in performance degradation (at least one= =20 function call/memory read per hook point). Unless a specific application=20 makes it worthwhile to add another hookup point, I don't think it's=20 worthwhile to provide such. There is some work going on to provide L2 hook= s,=20 however. More information about FreeBSD's pfil implementation can be found in=20 src/sys/net/pfil.? and the pfil(9) manpage. =2D-=20 /"\ Best regards, | mlaier@freebsd.org \ / Max Laier | ICQ #67774661 X http://pf4freebsd.love2party.net/ | mlaier@EFnet / \ ASCII Ribbon Campaign | Against HTML Mail and News --nextPart6337274.4qFF2rcy3S Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQBDBLIdXyyEoT62BG0RAnmAAJ0Wq5woq/ruE4z3LckVNgUV9q1Y6QCdEBZr qyU9dq9L/3L9rZ0nooltjrU= =T2Mc -----END PGP SIGNATURE----- --nextPart6337274.4qFF2rcy3S--
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