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 <smi...@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....@gmail.com
<mailto:nazari....@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-unsubscr...@freebsd.org"
_______________________________________________
freebsd-ipfw@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-ipfw
To unsubscribe, send any mail to "freebsd-ipfw-unsubscr...@freebsd.org"
