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/*
* (C) 2009 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_cluster.h>
static void
cluster_help(void)
{
printf(
"cluster match options:\n"
" --cluster-total-nodes <num> Set number of total nodes in cluster\n"
" [!] --cluster-local-node <num> Set the local node number\n"
" [!] --cluster-local-nodemask <num> Set the local node mask\n"
" --cluster-hash-seed <num> Set seed value of the Jenkins hash\n");
}
enum {
O_CL_TOTAL_NODES = 0,
O_CL_LOCAL_NODE,
O_CL_LOCAL_NODEMASK,
O_CL_HASH_SEED,
F_CL_TOTAL_NODES = 1 << O_CL_TOTAL_NODES,
F_CL_LOCAL_NODE = 1 << O_CL_LOCAL_NODE,
F_CL_LOCAL_NODEMASK = 1 << O_CL_LOCAL_NODEMASK,
F_CL_HASH_SEED = 1 << O_CL_HASH_SEED,
};
#define s struct xt_cluster_match_info
static const struct xt_option_entry cluster_opts[] = {
{.name = "cluster-total-nodes", .id = O_CL_TOTAL_NODES,
.type = XTTYPE_UINT32, .min = 1, .max = XT_CLUSTER_NODES_MAX,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, total_nodes)},
{.name = "cluster-local-node", .id = O_CL_LOCAL_NODE,
.excl = F_CL_LOCAL_NODEMASK, .flags = XTOPT_INVERT,
.type = XTTYPE_UINT32, .min = 1, .max = XT_CLUSTER_NODES_MAX},
{.name = "cluster-local-nodemask", .id = O_CL_LOCAL_NODEMASK,
.excl = F_CL_LOCAL_NODE, .type = XTTYPE_UINT32,
.min = 1, .max = XT_CLUSTER_NODES_MAX,
.flags = XTOPT_INVERT | XTOPT_PUT, XTOPT_POINTER(s, node_mask)},
{.name = "cluster-hash-seed", .id = O_CL_HASH_SEED,
.type = XTTYPE_UINT32, .flags = XTOPT_MAND | XTOPT_PUT,
XTOPT_POINTER(s, hash_seed)},
XTOPT_TABLEEND,
};
static void cluster_parse(struct xt_option_call *cb)
{
struct xt_cluster_match_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_CL_LOCAL_NODE:
if (cb->invert)
info->flags |= XT_CLUSTER_F_INV;
info->node_mask = 1 << (cb->val.u32 - 1);
break;
case O_CL_LOCAL_NODEMASK:
if (cb->invert)
info->flags |= XT_CLUSTER_F_INV;
break;
}
}
static void cluster_check(struct xt_fcheck_call *cb)
{
const struct xt_cluster_match_info *info = cb->data;
unsigned int test;
test = F_CL_TOTAL_NODES | F_CL_LOCAL_NODE | F_CL_HASH_SEED;
if ((cb->xflags & test) == test) {
if (info->node_mask >= (1ULL << info->total_nodes))
xtables_error(PARAMETER_PROBLEM,
"cluster match: "
"`--cluster-local-node' "
"must be <= `--cluster-total-nodes'");
return;
}
test = F_CL_TOTAL_NODES | F_CL_LOCAL_NODEMASK | F_CL_HASH_SEED;
if ((cb->xflags & test) == test) {
if (info->node_mask >= (1ULL << info->total_nodes))
xtables_error(PARAMETER_PROBLEM,
"cluster match: "
"`--cluster-local-nodemask' too big "
"for `--cluster-total-nodes'");
return;
}
if (!(cb->xflags & (F_CL_LOCAL_NODE | F_CL_LOCAL_NODEMASK)))
xtables_error(PARAMETER_PROBLEM,
"cluster match: `--cluster-local-node' or"
"`--cluster-local-nodemask' is missing");
}
static void
cluster_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_cluster_match_info *info = (void *)match->data;
printf(" cluster ");
if (info->flags & XT_CLUSTER_F_INV)
printf("!node_mask=0x%08x", info->node_mask);
else
printf("node_mask=0x%08x", info->node_mask);
printf(" total_nodes=%u hash_seed=0x%08x",
info->total_nodes, info->hash_seed);
}
static void
cluster_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_cluster_match_info *info = (void *)match->data;
if (info->flags & XT_CLUSTER_F_INV)
printf(" ! --cluster-local-nodemask 0x%08x", info->node_mask);
else
printf(" --cluster-local-nodemask 0x%08x", info->node_mask);
printf(" --cluster-total-nodes %u --cluster-hash-seed 0x%08x",
info->total_nodes, info->hash_seed);
}
static struct xtables_match cluster_mt_reg = {
.family = NFPROTO_UNSPEC,
.name = "cluster",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_cluster_match_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_cluster_match_info)),
.help = cluster_help,
.print = cluster_print,
.save = cluster_save,
.x6_parse = cluster_parse,
.x6_fcheck = cluster_check,
.x6_options = cluster_opts,
};
void _init(void)
{
xtables_register_match(&cluster_mt_reg);
}
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