Date: Fri, 4 Nov 2016 17:30:01 +0330 From: Samira Nazari <nazari.s11@gmail.com> To: Julian Elischer <julian@freebsd.org> Cc: Ian Smith <smithi@nimnet.asn.au>, "freebsd-ipfw@freebsd.org" <freebsd-ipfw@freebsd.org>, Shawn Bakhtiar <shashaness@hotmail.com> Subject: Re: change packets with IPFW divert Message-ID: <CAG1-nfzKbpVvak2q7yEj4u7Ms8QRWBR_b_fiAp6YM2hN3RPYRA@mail.gmail.com> In-Reply-To: <1a23a7ee-8933-5a9a-4ac2-982df1fc9a80@freebsd.org> References: <CAG1-nfyJ0LRsFH1xMZJhfkLC8GgLSgTukOdD%2B2-xLqLx8FWrBw@mail.gmail.com> <CY1PR14MB052039CE53AE379BF6693C5DC4D30@CY1PR14MB0520.namprd14.prod.outlook.com> <20161019023739.D6806@sola.nimnet.asn.au> <CAG1-nfy19SC_VSs=9vCVmq-01koL6rJ5fReyKiaNXV5JT5QRNQ@mail.gmail.com> <1a23a7ee-8933-5a9a-4ac2-982df1fc9a80@freebsd.org>
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RTP header compression On Thu, Nov 3, 2016 at 11:41 AM, Julian Elischer <julian@freebsd.org> wrote: > On 19/10/2016 1:56 PM, Samira Nazari wrote: > >> Thank you for all of your comments and help. >> In fact, I want to divert packets for one program that do header >> compression >> > > > What kind of header compression? Also look at netgraph. > >> >> Sam, Naz >> >> On Tue, Oct 18, 2016 at 7:33 PM, Ian Smith <smithi@nimnet.asn.au> wrote: >> >> On Tue, 18 Oct 2016 14:21:50 +0000, Shawn Bakhtiar wrote: >>> > On Oct 18, 2016, at 6:49 AM, Samira Nazari <nazari.s11@gmail.com >>> <mailto:nazari.s11@gmail.com>> wrote: >>> > > Hello every one, >>> > > When we diverte packets to the specified port with "IPFW divert" , >>> > > we can change it and re-sent to the kernel? >>> >>> > Not sure what you mean by change it but: >>> > >>> > "Divert sockets are similar to raw IP sockets, except that they can >>> > be bound to a specific divert port via the bind(2) system call. The >>> > IP address in the bind is ignored; only the port number is >>> > significant. A divert socket bound to a divert port will receive all >>> > packets diverted to that port by some (here unspecified) kernel >>> > mechanism(s). Packets may also be written to a divert port, in which >>> > case they re-enter kernel IP packet processing." >>> > >>> > -- SRC: https://www.freebsd.org/cgi/man.cgi?query=divert&sektion= >>> 4&apropos=0&manpath=FreeBSD+10.3-RELEASE+and+Ports >>> >>> Apart from divert(4), most likely the best example is the natd(8) code, >>> which modifies packet source or destination addresses and (maybe) ports. >>> >>> Ignoring the NAT processing - or not, as appropriate - the way natd uses >>> divert sockets both to receive packets from ipfw and later (perhaps) to >>> reinject them for further processing should show clearly how it's done. >>> >>> cheers, Ian >>> >>> _______________________________________________ >> freebsd-ipfw@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-ipfw >> To unsubscribe, send any mail to "freebsd-ipfw-unsubscribe@freebsd.org" >> >> >
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