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",
+ info->total_nodes, info->hash_seed);
+ return 1;
+
+}
+
static struct xtables_match cluster_mt_reg = {
.family = NFPROTO_UNSPEC,
.name = "cluster",
@@ -138,6 +148,7 @@ static struct xtables_match cluster_mt_reg = {
.x6_parse = cluster_parse,
.x6_fcheck = cluster_check,
.x6_options = cluster_opts,
+ .xlate = cluster_xlate,
};
void _init(void)
--
1.9.1
--
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