Re: [Xen-users] Implementing firewall functionality in dom0 host on behalf of domU guests

[Andrew Finkenstadt <andy@xxxxxxxxxxxxxxx>]

On Tue, May 15, 2012 at 11:31 AM, Andrew Finkenstadt <andy@xxxxxxxxxxxxxxx> wrote:

On Tue, May 15, 2012 at 10:43 AM, Andrew Finkenstadt <andy@xxxxxxxxxxxxxxx> wrote:

My actual question (of how to do the same under CentOS 5.8 + GITCO_Xen_4.1.2) will be a followup to this posting.

The output from "iptables -L -n -v" is subtly different, related to physdev matching.

Under CentOS xen 3.1, 

Chain FORWARD (policy ACCEPT 1957M packets, 291G bytes)

 pkts bytes target     prot opt in     out     source               destination

1952M  290G XYZZY      all  --  *      *       0.0.0.0/0            0.0.0.0/0           PHYSDEV match --physdev-in peth0 --physdev-out XYZZY

2306M   13T ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           PHYSDEV match --physdev-in XYZZY

Under CentOS xen 4.1.2,

[root@xm00 ~]# iptables -L -n -v

Chain FORWARD (policy ACCEPT 16 packets, 3564 bytes)

 pkts bytes target     prot opt in     out     source               destination

    0     0 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           PHYSDEV match --physdev-out vif1.0 --physdev-is-bridged

    0     0 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           PHYSDEV match --physdev-in vif1.0 --physdev-is-bridged

What changes are necessary for the FORWARD chain to run the XYZZY firewall matching rules BEFORE passing on the packets in the ACCEPT rules?

The correct command is:

iptables -I FORWARD -m physdev --physdev-in $IF_IN -j $RULENAME

--Andy

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