1/*
2 * Shared library add-on to iptables to add quota support
3 *
4 * Sam Johnston <samj@samj.net>
5 */
6#include <stdio.h>
7#include <xtables.h>
8#include <linux/netfilter/xt_quota.h>
9
10enum {
11	O_QUOTA = 0,
12};
13
14static const struct xt_option_entry quota_opts[] = {
15	{.name = "quota", .id = O_QUOTA, .type = XTTYPE_UINT64,
16	 .flags = XTOPT_MAND | XTOPT_INVERT | XTOPT_PUT,
17	 XTOPT_POINTER(struct xt_quota_info, quota)},
18	XTOPT_TABLEEND,
19};
20
21static void quota_help(void)
22{
23	printf("quota match options:\n"
24	       "[!] --quota quota		quota (bytes)\n");
25}
26
27static void
28quota_print(const void *ip, const struct xt_entry_match *match, int numeric)
29{
30	const struct xt_quota_info *q = (const void *)match->data;
31	printf(" quota: %llu bytes", (unsigned long long)q->quota);
32}
33
34static void
35quota_save(const void *ip, const struct xt_entry_match *match)
36{
37	const struct xt_quota_info *q = (const void *)match->data;
38
39	if (q->flags & XT_QUOTA_INVERT)
40		printf("! ");
41	printf(" --quota %llu", (unsigned long long) q->quota);
42}
43
44static void quota_parse(struct xt_option_call *cb)
45{
46	struct xt_quota_info *info = cb->data;
47
48	xtables_option_parse(cb);
49	if (cb->invert)
50		info->flags |= XT_QUOTA_INVERT;
51	info->quota = cb->val.u64;
52}
53
54static struct xtables_match quota_match = {
55	.family		= NFPROTO_UNSPEC,
56	.name		= "quota",
57	.version	= XTABLES_VERSION,
58	.size		= XT_ALIGN(sizeof (struct xt_quota_info)),
59	.userspacesize	= offsetof(struct xt_quota_info, master),
60	.help		= quota_help,
61	.print		= quota_print,
62	.save		= quota_save,
63	.x6_parse	= quota_parse,
64	.x6_options	= quota_opts,
65};
66
67void
68_init(void)
69{
70	xtables_register_match(&quota_match);
71}
72