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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2009-05-05 17:46:07 +0200 |
|---|---|---|
| committer | Patrick McHardy <kaber@trash.net> | 2009-05-05 17:46:07 +0200 |
| commit | 280f37afa2c270ff029cb420b34396aa002909c3 (patch) | |
| tree | 6d90560f2210c7ddb4da5640a2d190357c4f41b4 /net | |
| parent | b98b4947cb79d670fceca0e951c092eea93e9baa (diff) | |
| download | linux-280f37afa2c270ff029cb420b34396aa002909c3.tar.gz linux-280f37afa2c270ff029cb420b34396aa002909c3.tar.bz2 linux-280f37afa2c270ff029cb420b34396aa002909c3.zip | |
netfilter: xt_cluster: fix use of cluster match with 32 nodes
This patch fixes a problem when you use 32 nodes in the cluster
match:
% iptables -I PREROUTING -t mangle -i eth0 -m cluster \
--cluster-total-nodes 32 --cluster-local-node 32 \
--cluster-hash-seed 0xdeadbeef -j MARK --set-mark 0xffff
iptables: Invalid argument. Run `dmesg' for more information.
% dmesg | tail -1
xt_cluster: this node mask cannot be higher than the total number of nodes
The problem is related to this checking:
if (info->node_mask >= (1 << info->total_nodes)) {
printk(KERN_ERR "xt_cluster: this node mask cannot be "
"higher than the total number of nodes\n");
return false;
}
(1 << 32) is 1. Thus, the checking fails.
BTW, I said this before but I insist: I have only tested the cluster
match with 2 nodes getting ~45% extra performance in an active-active setup.
The maximum limit of 32 nodes is still completely arbitrary. I'd really
appreciate if people that have more nodes in their setups let me know.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/xt_cluster.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/netfilter/xt_cluster.c b/net/netfilter/xt_cluster.c index 6c4847662b85..69a639f35403 100644 --- a/net/netfilter/xt_cluster.c +++ b/net/netfilter/xt_cluster.c @@ -135,7 +135,13 @@ static bool xt_cluster_mt_checkentry(const struct xt_mtchk_param *par) { struct xt_cluster_match_info *info = par->matchinfo; - if (info->node_mask >= (1 << info->total_nodes)) { + if (info->total_nodes > XT_CLUSTER_NODES_MAX) { + printk(KERN_ERR "xt_cluster: you have exceeded the maximum " + "number of cluster nodes (%u > %u)\n", + info->total_nodes, XT_CLUSTER_NODES_MAX); + return false; + } + if (info->node_mask >= (1ULL << info->total_nodes)) { printk(KERN_ERR "xt_cluster: this node mask cannot be " "higher than the total number of nodes\n"); return false; |