Date: Thu, 3 Nov 2016 16:11:03 +0800 From: Julian Elischer <julian@freebsd.org> To: Samira Nazari <nazari.s11@gmail.com>, Ian Smith <smithi@nimnet.asn.au> Cc: "freebsd-ipfw@freebsd.org" <freebsd-ipfw@freebsd.org>, Shawn Bakhtiar <shashaness@hotmail.com> Subject: Re: change packets with IPFW divert Message-ID: <1a23a7ee-8933-5a9a-4ac2-982df1fc9a80@freebsd.org> In-Reply-To: <CAG1-nfy19SC_VSs=9vCVmq-01koL6rJ5fReyKiaNXV5JT5QRNQ@mail.gmail.com> 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>
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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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