On Thu, May 29, 2014 at 3:39 PM, Luigi Rizzo <ri...@iet.unipi.it> wrote:
> > > > On Thu, May 29, 2014 at 3:32 PM, Andreas Nilsson <andrn...@gmail.com>wrote: > >> On Thu, May 29, 2014 at 3:10 PM, Luigi Rizzo <ri...@iet.unipi.it> wrote: >> >>> On Thu, May 29, 2014 at 08:45:26PM +0800, bycn82 wrote: >>> ... >>> > >>> > Sure, that is the reason why developers are providing more and more >>> rule options. But the my question is do we have enough options to match all >>> the fixed position values? >>> >>> we do not have an option for fixed position matching. >>> >>> As i said, feel free to submit one and i will be happy to >>> import it if the code is clean (btw i am still waiting >>> for fixes to the other 'rate limiting' option you sent), >>> but keep in mind that 'fixed position' is mostly useless. >>> >>> More useful options would be one where you express the position as >>> >>> '{MAC|VLAN|IP|UDP|TCP|...|PAYLOAD}+offset' >>> >>> so at least you can adapt to variant headers, or one where you can look >>> for a pattern in the entire packet or in a portion of it. >>> >>> cheers >>> luigi >>> _______________________________________________ >>> freebsd-net@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-net >>> To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" >>> >> >> Wouldn't PAYLOAD require possibly reassembly of a fragmented packet? >> > > Good enough for me. I might be able to get some time on a xena 10g device to check some numbers if there is any interest for coming changesets. Best regards Andreas > well, other firewalls do reassemble fragments, ipfw does not > (actually there was some code floating around in the past that > did implement a reassembly, not sure if it was committed). > With this in mind, PAYLOAD would not be that different > from TCP if you think that you can have a ton of IPV6 headers and > extensions. So if/when we implement reassembly, that would be > the default for any action that searches past the end of > the first fragment. > > Except from fragmentation, all ipfw instructions already track > the beginning of the relevant header for the info at hand > (typically skipping ip options or ipv6 headers). > It costs something, but not a fortune. > > cheers > luigi > > >> It certainly is a good feature, don't get me wrong. But what are the >> performance hits? >> >> Best regards >> Andreas >> > > > > -- > -----------------------------------------+------------------------------- > Prof. Luigi RIZZO, ri...@iet.unipi.it . Dip. di Ing. dell'Informazione > http://www.iet.unipi.it/~luigi/ . Universita` di Pisa > TEL +39-050-2211611 . via Diotisalvi 2 > Mobile +39-338-6809875 . 56122 PISA (Italy) > -----------------------------------------+------------------------------- > _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"