Date: Wed, 2 Mar 2005 14:38:46 +0200 From: Ruslan Ermilov <ru@freebsd.org> To: Aziz KEZZOU <opensource.enthousiat@gmail.com> Cc: freebsd-net@freebsd.org Subject: Re: netgraph question : how to intercept incoming IP packets of a certain type? Message-ID: <20050302123846.GC47110@ip.net.ua> In-Reply-To: <37e131660503011947346b94fb@mail.gmail.com> References: <37e131660503011947346b94fb@mail.gmail.com>
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--2/5bycvrmDh4d1IB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 01, 2005 at 10:47:07PM -0500, Aziz KEZZOU wrote: > Hi folks, > Here is what I want to do : "Intercept all incoming IP packets on an > Ethernet interface of a certain type (e.g RSVP) and call my own > function to process, all inside the kernel" >=20 > Netgraph nodes : ng_iface, nf_bpf (and probably ng_ether) look > promising for this task but I can not figure out how to do it in > practice... > =20 > Any help is appreciated. Thanks, >=20 I thought Julian already answered this... You can do this with ng_ipfw(4) in -CURRENT. Or you can filter (with ng_bpf(4)) the packets of interest and forward them somewhere. Example: +---v | (upper) | rl0: [ng_ether] | (lower) | ^ | | | v | (lower) | bpf_rl0: [ng_bpf] | (upper) +---^ [bpf] should be configured to forward matching packets received on "lower" to some other hook, and non-matching packets to "upper". Similarly for packets received on "upper", forward packets of interest to some other hook, and non-matching packets to "lower". Cheers, --=20 Ruslan Ermilov ru@FreeBSD.org FreeBSD committer --2/5bycvrmDh4d1IB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFCJbPWqRfpzJluFF4RAsR1AJ96yk8iSHvAhRNoIQE4OiMJT4+/aACgjEKh Ls2NOcNL7Ug4sbiyA4Ada4Y= =Y0r1 -----END PGP SIGNATURE----- --2/5bycvrmDh4d1IB--
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