Hi Tomer,
I am currently working on a kernel module which offloads traffic from
the Networking stack.
This is part of a project which optimizes IP forwarding for low end
routers that have weak CPU and low on memory.
Sounds interesting. Other approaches of speeding up forwarding are btw.
also investigated right now, see https://dev.openwrt.org/changeset/43587
I saw that nftables and libnftables are not yet supported in my
openwrt codebase (I am working with attitude adjustment 14.07)
there is no attitude adjustment 14.07. attitude adjustment is 12.09,
barrier breaker is 14.07.
- but saw that recently some nftables related patches were added to
the master branch by you.
Could you please share the current status of nftables support in openwrt?
nftables is packaged, I added some patches so that it is a bit more
embedded friendly (some of those are upstream, some of them aren't). I
also packaged and reorganised the netfilter kernel packages.
So you can select nftables in menuconfig and can play around with it.
You can also get rid of iptables and use nftables only by deselecting
the related packages.
Known Issues
* In general its not well tested. It might blow up here or there. Help
and bugreports are appreciated.
* We are aiming for kernel 3.14 for the next release which has somewhat
reasonable nftables support but lacks some useful things e.g. devgroups,
extended reject support among maybe other things iirc. So it will be
there to play around / get a first look at it but thats it. I don't know
how the following release will look but I wouldn't keep my hopes up all
too high there for it to change that much.
* Which brings us to the main issue, our firewall abstraction (the
firewall package, all the /etc/config/firewall magic) is tied to
iptables at the moment, so if you want to use nftables right now you get
bare metal and have to write your own rulesets completely from scratch,
cannot use /etc/config/firewall or a gui.
Hopefully someone will put some effort into this next year and refactor
our firewall daemon to use nftables but thats a major effort. Also at
the moment its not very clear when the netfilter team will create a
high-level library to interact with nftables which would probably be
sort of a prerequisite for it depending on how this rewritten daemon
will work.
Regardless, I will be happy to participate with the development and
testing of nftables if needed, just let me know if I can help,
Feel free to play around with it and send me bugreports etc.
If it looks like an nftables bug you should probably contact the
netfilter guys directly. If it looks like I messed up a patch or a
package definition then tell me.
Cheers,
Steven
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