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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 <xtables.h>
#include <linux/netfilter/xt_quota.h>
static const struct option quota_opts[] = {
{"quota", 1, NULL, '1'},
{ .name = NULL }
};
static void quota_help(void)
{
printf("quota match options:\n"
"[!] --quota quota quota (bytes)\n");
}
static void
quota_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_quota_info *q = (const void *)match->data;
printf("quota: %llu bytes", (unsigned long long) q->quota);
}
static void
quota_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_quota_info *q = (const void *)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, NULL, 10);
#ifdef DEBUG_XT_QUOTA
printf("Quota: %llu\n", *quota);
#endif
if (*quota == UINT64_MAX)
xtables_error(PARAMETER_PROBLEM, "quota invalid: '%s'\n", s);
else
return 1;
}
static int
quota_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_quota_info *info = (struct xt_quota_info *) (*match)->data;
switch (c) {
case '1':
if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
xtables_error(PARAMETER_PROBLEM, "quota: unexpected '!'");
if (!parse_quota(optarg, &info->quota))
xtables_error(PARAMETER_PROBLEM,
"bad quota: '%s'", optarg);
if (invert)
info->flags |= XT_QUOTA_INVERT;
break;
default:
return 0;
}
return 1;
}
static struct xtables_match quota_match = {
.family = NFPROTO_UNSPEC,
.name = "quota",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof (struct xt_quota_info)),
.userspacesize = offsetof(struct xt_quota_info, quota),
.help = quota_help,
.parse = quota_parse,
.print = quota_print,
.save = quota_save,
.extra_opts = quota_opts,
};
void
_init(void)
{
xtables_register_match("a_match);
}
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