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 <mayhs11saini@xxxxxxxxx>
> ---
> 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",
Also check:
ldd /path/to/your/iptables binary
and check what libraries you're suing, probably your iptables binary
using old ones.
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