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/*
* Shared library add-on to iptables to add quota support
*
* Sam Johnston <samj@samj.net>
*/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter/xt_quota.h>
#include <linux/netfilter_ipv4/ip_tables.h>
static struct option opts[] = {
{"quota", 1, 0, '1'},
{0}
};
/* print usage */
static void
help(void)
{
printf("quota options:\n"
" --quota quota quota (bytes)\n" "\n");
}
/* print matchinfo */
static void
print(const struct ipt_ip *ip, const struct ipt_entry_match *match, int numeric)
{
struct xt_quota_info *q = (struct xt_quota_info *) match->data;
printf("quota: %llu bytes", (unsigned long long) q->quota);
}
/* save matchinfo */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
{
struct xt_quota_info *q = (struct xt_quota_info *) match->data;
printf("--quota %llu ", (unsigned long long) q->quota);
}
/* parse quota option */
static int
parse_quota(const char *s, u_int64_t * quota)
{
*quota = strtoull(s, (char **) NULL, 10);
#ifdef DEBUG_IPT_QUOTA
printf("Quota: %llu\n", *quota);
#endif
if (*quota == -1)
exit_error(PARAMETER_PROBLEM, "quota invalid: '%s'\n", s);
else
return 1;
}
/* parse all options, returning true if we found any for us */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
unsigned int *nfcache, struct ipt_entry_match **match)
{
struct xt_quota_info *info = (struct xt_quota_info *) (*match)->data;
switch (c) {
case '1':
if (check_inverse(optarg, &invert, NULL, 0))
exit_error(PARAMETER_PROBLEM, "quota: unexpected '!'");
if (!parse_quota(optarg, &info->quota))
exit_error(PARAMETER_PROBLEM,
"bad quota: '%s'", optarg);
break;
default:
return 0;
}
return 1;
}
/* no final check */
static void
final_check(unsigned int flags)
{
}
struct iptables_match quota = {
.next = NULL,
.name = "quota",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof (struct xt_quota_info)),
.userspacesize = offsetof(struct xt_quota_info, quota),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void
_init(void)
{
register_match("a);
}
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