[PATCH] multiple instances of ipfw(4)

Julian Elischer julian at freebsd.org
Mon Jan 30 22:22:53 UTC 2012

On 1/30/12 4:01 AM, Ermal Luçi wrote:
> Hello,
> from needs on pfSense a patch for allowing multiple intances of
> ipfw(4) in kernel to co-exist was developed.
> It can be found here
> https://raw.github.com/bsdperimeter/pfsense-tools/master/patches/RELENG_9_0/CP_multi_instance_ipfw.diff
> It is used in conjuction with this tool
> https://raw.github.com/bsdperimeter/pfsense-tools/master/pfPorts/ipfw_context/files/ipfw_context.c
> It allows creation of contextes/instances and assignment of specific
> interfaces to specific contexts/instances.
> Surely i know that this is not the best way to implement generically
> but it gets the job done for us as it is, read below.
> What i would like to know is if there is interest to see such
> functionality in FreeBSD?
> I am asking first to see if there is some consensus about this as a
> feature, needed or not!
> If interest is shown i will transform the patch to allow:
> - ipfw(8) to manage the contextes create/destroy
> - ipfw(8) to manage interface membership. Closing the race of two
> parallell clients modifying different contextes.
> There is another design choice to be made about storing the membership
> of interfaces into contexts/instances, but i do not see that as
> blocking.
> It is quite handy feature, which can be exploited even to scale on SMP
> machines by extending it to bind a specific instance(with its
> interaces) to a specific CPU/core?!

for this I use multiple vimages, but just as there is room for 
multiplt routing tables AND vimage,
there is probably room for multiple firewalls AND vimage.
this is a bit more in the iptables direction I guess.

> Comments/Feedback expected,
> Ermal
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