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