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/* Shared library add-on to iptables to add IPMARK target support.
* (C) 2003 by Grzegorz Janoszka <Grzegorz.Janoszka@pro.onet.pl>
*
* based on original MARK target
*
* This program is distributed under the terms of GNU GPL
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_IPMARK.h>
#define IPT_ADDR_USED 1
#define IPT_AND_MASK_USED 2
#define IPT_OR_MASK_USED 4
struct ipmarkinfo {
struct ipt_entry_target t;
struct ipt_ipmark_target_info ipmark;
};
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"IPMARK target v%s options:\n"
" --addr src/dst use source or destination ip address\n"
" --and-mask value logical AND ip address with this value becomes MARK\n"
" --or-mask value logical OR ip address with this value becomes MARK\n"
"\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ "addr", 1, 0, '1' },
{ "and-mask", 1, 0, '2' },
{ "or-mask", 1, 0, '3' },
{ 0 }
};
/* Initialize the target. */
static void
init(struct ipt_entry_target *t, unsigned int *nfcache)
{
struct ipt_ipmark_target_info *ipmarkinfo =
(struct ipt_ipmark_target_info *)t->data;
ipmarkinfo->andmask=0xffffffff;
ipmarkinfo->ormask=0;
}
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
struct ipt_entry_target **target)
{
struct ipt_ipmark_target_info *ipmarkinfo
= (struct ipt_ipmark_target_info *)(*target)->data;
switch (c) {
char *end;
case '1':
if(!strcmp(optarg, "src")) ipmarkinfo->addr=IPT_IPMARK_SRC;
else if(!strcmp(optarg, "dst")) ipmarkinfo->addr=IPT_IPMARK_DST;
else exit_error(PARAMETER_PROBLEM, "Bad addr value `%s' - should be `src' or `dst'", optarg);
if (*flags & IPT_ADDR_USED)
exit_error(PARAMETER_PROBLEM,
"IPMARK target: Can't specify --addr twice");
*flags |= IPT_ADDR_USED;
break;
case '2':
ipmarkinfo->andmask = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad and-mask value `%s'", optarg);
if (*flags & IPT_AND_MASK_USED)
exit_error(PARAMETER_PROBLEM,
"IPMARK target: Can't specify --and-mask twice");
*flags |= IPT_AND_MASK_USED;
break;
case '3':
ipmarkinfo->ormask = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad or-mask value `%s'", optarg);
if (*flags & IPT_OR_MASK_USED)
exit_error(PARAMETER_PROBLEM,
"IPMARK target: Can't specify --or-mask twice");
*flags |= IPT_OR_MASK_USED;
break;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!(flags & IPT_ADDR_USED))
exit_error(PARAMETER_PROBLEM,
"IPMARK target: Parameter --addr is required");
if (!(flags & (IPT_AND_MASK_USED | IPT_OR_MASK_USED)))
exit_error(PARAMETER_PROBLEM,
"IPMARK target: Parameter --and-mask or --or-mask is required");
}
/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_target *target,
int numeric)
{
const struct ipt_ipmark_target_info *ipmarkinfo =
(const struct ipt_ipmark_target_info *)target->data;
if(ipmarkinfo->addr == IPT_IPMARK_SRC)
printf("IPMARK src");
else
printf("IPMARK dst");
printf(" ip and 0x%lx or 0x%lx", ipmarkinfo->andmask, ipmarkinfo->ormask);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
const struct ipt_ipmark_target_info *ipmarkinfo =
(const struct ipt_ipmark_target_info *)target->data;
if(ipmarkinfo->addr == IPT_IPMARK_SRC)
printf("--addr=src ");
else
printf("--addr=dst ");
if(ipmarkinfo->andmask != 0xffffffff)
printf("--and-mask 0x%lx ", ipmarkinfo->andmask);
if(ipmarkinfo->ormask != 0)
printf("--or-mask 0x%lx ", ipmarkinfo->ormask);
}
static struct iptables_target ipmark = {
.next = NULL,
.name = "IPMARK",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_ipmark_target_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_ipmark_target_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_target(&ipmark);
}
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