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/* Shared library add-on to iptables to add CLUSTERIP target support.
* (C) 2003 by Harald Welte <laforge@gnumonks.org>
*
* Development of this code was funded by SuSE AG, http://www.suse.com/
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <stddef.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include "../include/linux/netfilter_ipv4/ipt_CLUSTERIP.h"
static void
help(void)
{
printf(
"CLUSTERIP target v%s options:\n"
" --new Create a new ClusterIP\n"
" --hashmode <mode> Specify hashing mode\n"
" sourceip\n"
" sourceip-sourceport\n"
" sourceip-sourceport-destport\n"
" --clustermac <mac> Set clusterIP MAC address\n"
" --total-nodes <num> Set number of total nodes in cluster\n"
" --local-node <num> Set the local node number\n"
" --hash-init <num> Set init value of the Jenkins hash\n"
"\n",
IPTABLES_VERSION);
}
#define PARAM_NEW 0x0001
#define PARAM_HMODE 0x0002
#define PARAM_MAC 0x0004
#define PARAM_TOTALNODE 0x0008
#define PARAM_LOCALNODE 0x0010
#define PARAM_HASHINIT 0x0020
static const struct option opts[] = {
{ "new", 0, NULL, '1' },
{ "hashmode", 1, NULL, '2' },
{ "clustermac", 1, NULL, '3' },
{ "total-nodes", 1, NULL, '4' },
{ "local-node", 1, NULL, '5' },
{ "hash-init", 1, NULL, '6' },
{ }
};
static void
parse_mac(const char *mac, char *macbuf)
{
unsigned int i = 0;
if (strlen(mac) != ETH_ALEN*3-1)
exit_error(PARAMETER_PROBLEM, "Bad mac address `%s'", mac);
for (i = 0; i < ETH_ALEN; i++) {
long number;
char *end;
number = strtol(mac + i*3, &end, 16);
if (end == mac + i*3 + 2
&& number >= 0
&& number <= 255)
macbuf[i] = number;
else
exit_error(PARAMETER_PROBLEM,
"Bad mac address `%s'", mac);
}
}
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry,
struct xt_entry_target **target)
{
struct ipt_clusterip_tgt_info *cipinfo
= (struct ipt_clusterip_tgt_info *)(*target)->data;
switch (c) {
unsigned int num;
case '1':
cipinfo->flags |= CLUSTERIP_FLAG_NEW;
if (*flags & PARAM_NEW)
exit_error(PARAMETER_PROBLEM, "Can only specify `--new' once\n");
*flags |= PARAM_NEW;
break;
case '2':
if (!(*flags & PARAM_NEW))
exit_error(PARAMETER_PROBLEM, "Can only specify hashmode combined with `--new'\n");
if (*flags & PARAM_HMODE)
exit_error(PARAMETER_PROBLEM, "Can only specify hashmode once\n");
if (!strcmp(optarg, "sourceip"))
cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP;
else if (!strcmp(optarg, "sourceip-sourceport"))
cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP_SPT;
else if (!strcmp(optarg, "sourceip-sourceport-destport"))
cipinfo->hash_mode = CLUSTERIP_HASHMODE_SIP_SPT_DPT;
else
exit_error(PARAMETER_PROBLEM, "Unknown hashmode `%s'\n",
optarg);
*flags |= PARAM_HMODE;
break;
case '3':
if (!(*flags & PARAM_NEW))
exit_error(PARAMETER_PROBLEM, "Can only specify MAC combined with `--new'\n");
if (*flags & PARAM_MAC)
exit_error(PARAMETER_PROBLEM, "Can only specify MAC once\n");
parse_mac(optarg, (char *)cipinfo->clustermac);
if (!(cipinfo->clustermac[0] & 0x01))
exit_error(PARAMETER_PROBLEM, "MAC has to be a multicast ethernet address\n");
*flags |= PARAM_MAC;
break;
case '4':
if (!(*flags & PARAM_NEW))
exit_error(PARAMETER_PROBLEM, "Can only specify node number combined with `--new'\n");
if (*flags & PARAM_TOTALNODE)
exit_error(PARAMETER_PROBLEM, "Can only specify total node number once\n");
if (string_to_number(optarg, 1, CLUSTERIP_MAX_NODES, &num) < 0)
exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg);
cipinfo->num_total_nodes = (u_int16_t)num;
*flags |= PARAM_TOTALNODE;
break;
case '5':
if (!(*flags & PARAM_NEW))
exit_error(PARAMETER_PROBLEM, "Can only specify node number combined with `--new'\n");
if (*flags & PARAM_LOCALNODE)
exit_error(PARAMETER_PROBLEM, "Can only specify local node number once\n");
if (string_to_number(optarg, 1, CLUSTERIP_MAX_NODES, &num) < 0)
exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg);
cipinfo->num_local_nodes = 1;
cipinfo->local_nodes[0] = (u_int16_t)num;
*flags |= PARAM_LOCALNODE;
break;
case '6':
if (!(*flags & PARAM_NEW))
exit_error(PARAMETER_PROBLEM, "Can only specify hash init value combined with `--new'\n");
if (*flags & PARAM_HASHINIT)
exit_error(PARAMETER_PROBLEM, "Can specify hash init value only once\n");
if (string_to_number(optarg, 0, UINT_MAX, &num) < 0)
exit_error(PARAMETER_PROBLEM, "Unable to parse `%s'\n", optarg);
cipinfo->hash_initval = num;
*flags |= PARAM_HASHINIT;
break;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (flags == 0)
return;
if ((flags & (PARAM_NEW|PARAM_HMODE|PARAM_MAC|PARAM_TOTALNODE|PARAM_LOCALNODE))
== (PARAM_NEW|PARAM_HMODE|PARAM_MAC|PARAM_TOTALNODE|PARAM_LOCALNODE))
return;
exit_error(PARAMETER_PROBLEM, "CLUSTERIP target: Invalid parameter combination\n");
}
static char *hashmode2str(enum clusterip_hashmode mode)
{
char *retstr;
switch (mode) {
case CLUSTERIP_HASHMODE_SIP:
retstr = "sourceip";
break;
case CLUSTERIP_HASHMODE_SIP_SPT:
retstr = "sourceip-sourceport";
break;
case CLUSTERIP_HASHMODE_SIP_SPT_DPT:
retstr = "sourceip-sourceport-destport";
break;
default:
retstr = "unknown-error";
break;
}
return retstr;
}
static char *mac2str(const u_int8_t mac[ETH_ALEN])
{
static char buf[ETH_ALEN*3];
sprintf(buf, "%02X:%02X:%02X:%02X:%02X:%02X",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
return buf;
}
/* Prints out the targinfo. */
static void
print(const void *ip,
const struct xt_entry_target *target,
int numeric)
{
const struct ipt_clusterip_tgt_info *cipinfo =
(const struct ipt_clusterip_tgt_info *)target->data;
if (!cipinfo->flags & CLUSTERIP_FLAG_NEW) {
printf("CLUSTERIP");
return;
}
printf("CLUSTERIP hashmode=%s clustermac=%s total_nodes=%u local_node=%u hash_init=%u",
hashmode2str(cipinfo->hash_mode),
mac2str(cipinfo->clustermac),
cipinfo->num_total_nodes,
cipinfo->local_nodes[0],
cipinfo->hash_initval);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const void *ip, const struct xt_entry_target *target)
{
const struct ipt_clusterip_tgt_info *cipinfo =
(const struct ipt_clusterip_tgt_info *)target->data;
/* if this is not a new entry, we don't need to save target
* parameters */
if (!cipinfo->flags & CLUSTERIP_FLAG_NEW)
return;
printf("--new --hashmode %s --clustermac %s --total-nodes %d --local-node %d --hash-init %u",
hashmode2str(cipinfo->hash_mode),
mac2str(cipinfo->clustermac),
cipinfo->num_total_nodes,
cipinfo->local_nodes[0],
cipinfo->hash_initval);
}
static struct iptables_target clusterip = {
.name = "CLUSTERIP",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_clusterip_tgt_info)),
.userspacesize = offsetof(struct ipt_clusterip_tgt_info, config),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_target(&clusterip);
}
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