On Tue, May 30, 2017 at 12:08:55PM +0200, Pablo Neira Ayuso wrote:
> On Tue, May 30, 2017 at 01:55:34PM +0530, Shyam Saini wrote:
> > Add translation for cluster match to nftables
> >
> > $ sudo iptables-translate -A PREROUTING -t mangle -i eth1 -m cluster
> > --cluster-total-nodes 2 --cluster-local-node 1 --cluster-hash-seed
> > 0xdeadbeef -j MARK --set-mark 0xffff
> > nft add rule ip mangle PREROUTING iifname eth1 jhash ct original saddr mod
> > 2 seed 0xdeadbeef eq 0 meta pkttype set host counter meta mark set
> > 0xffff
> >
> > $ sudo iptables-translate -A PREROUTING -t mangle -i eth1 -m cluster
> > --cluster-total-nodes 2 --cluster-local-nodemask 1 --cluster-hash-seed
> > 0xdeadbeef -j MARK --set-mark 0xffff
> > nft add rule ip mangle PREROUTING iifname eth1 jhash ct original saddr mod
> > 2 seed 0xdeadbeef eq 0 meta pkttype set host counter meta mark set
> > 0xffff
> >
> > --debug=netlink Result
> > ip mangle PREROUTING
> > [ meta load iifname => reg 1 ]
> > [ cmp eq reg 1 0x31687465 0x00000000 0x00000000 0x00000000 ]
> > [ ct load src => reg 2 , dir original ]
> > [ hash reg 1 = jhash(reg 2, 4, 0xdeadbeef) % mod 2 ]
> > [ cmp eq reg 1 0x00000000 ]
> > [ immediate reg 1 0x00000000 ]
> > [ meta set pkttype with reg 1 ]
> > [ counter pkts 0 bytes 0 ]
> > [ immediate reg 1 0x0000ffff ]
> > [ meta set mark with reg 1 ]
> >
> > For Example:
> >
> > If we have total 2 nodes (i.e, --cluster-total-nodes is 2) in the cluster
> > then
> > modulus 2 = {0, 1}
> >
> > For node 1 (--cluster-local-node 1)
> > jhash ct original saddr mod 2 seed 0xdeadbeef eq 0
> >
> > For node 2 (--cluster-local-node 2)
> > jhash ct original saddr mod 2 seed 0xdeadbeef eq 1
> >
> > Signed-off-by: Shyam Saini <[email protected]>
> > ---
> > extensions/libxt_cluster.c | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> >
> > diff --git a/extensions/libxt_cluster.c b/extensions/libxt_cluster.c
> > index 3adff12..f2abd18 100644
> > --- a/extensions/libxt_cluster.c
> > +++ b/extensions/libxt_cluster.c
> > @@ -126,6 +126,16 @@ cluster_save(const void *ip, const struct
> > xt_entry_match *match)
> > info->total_nodes, info->hash_seed);
> > }
> >
> > +static int cluster_xlate(struct xt_xlate *xl,
> > + const struct xt_xlate_mt_params *params)
> > +{
> > + const struct xt_cluster_match_info *info = (const struct
> > xt_cluster_match_info *)params->match->data;
> > +
> > + xt_xlate_add(xl, "jhash ct original saddr mod %u seed 0x%08x eq 0 meta
> > pkttype set host",
>
> This should use "eq %u" because:
>
> xt_xlate_add(xl, "jhash ct original saddr mod %u seed 0x%08x eq %u meta
> pkttype set host",
Forget this I mentioned below, got mixed with another email to you.
What I'm telling here is, the "eq %u" should be used to translate
info->node_mask.
Note that info->node_mask is a bitmask, so you have to interpret this
accordingly from the translation.
Note that we have to support --cluster-local-nodemask too, you can
translate this using a set, ie.
jhash ct original saddr mod 4 seed 0x1234 { 0, 1 } meta pkttype set host
OK?
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