Skip site navigation (1)Skip section navigation (2)
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+2-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>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help
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"
>>
>>
>



Want to link to this message? Use this URL: <http://docs.FreeBSD.org/cgi/mid.cgi?CAG1-nfzKbpVvak2q7yEj4u7Ms8QRWBR_b_fiAp6YM2hN3RPYRA>