Patch using ipset match in policy routing.

[borg]

Hello.

Here comes the patch thats makes possible to use ipset
directly in ip rule (policy routing).
This makes such configuration easier, because
there is no need to have:
iptables -t mangle -A OUTPUT -m set --set ... -j MARK --set-mark 1
ip rule add fwmark 1 lookup 1

Additionaly, it fixes issue with wrong src addr for unconnected
protocols such as UDP, ICMP...
https://bugzilla.kernel.org/show_bug.cgi?id=16216

Brief question to google confirms that few people might have
interest in this patch.

ftp://borg.uu3.net/home/borg/patch/linux-2.6.27.62+ipset_routing.patch
ftp://borg.uu3.net/home/borg/patch/iproute2+ipset.patch

To install the patch, first you need to patch kernel using
ipset (4.5 preffered). Then, you apply this patch.
Additionaly, you need to patch iproute2 to use new match:
ip route add ipset <name> src|dst lookup <n>

The place for this is IPSET webpage I belive, but I mailing
it here because I have few concerns:
- Now this patch needs IPSET to be compiled into kernel (no modules)
  I would like to fix it
- I had to add 2 new function to API of IPSET, and so I probably
  doing something wrong.
- Patch is conditional: CONFIG_IP_NF_SET
  except in 2 places:
  size_t payload = NLMSG_ALIGN(sizeof(struct fib_rule_hdr))
  enum { ... } // FRA_* defs

  Not sure if this is correct way.

Sorry that patch is agaist old kernel. I just needed it fast
for monday and this one is run on 2 production boxes I need
this feature.

One box is already patched and is running fine (non SMP host).
No issues so far. I will compare CPU usage after roughty 24 hrs.

Second box is SMP and I will try to patch it ASAP.

Regards,
Borg
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