libxt_quota.c revision d09b6d591ca7d7d7575cb6aa20384c9830f777ab 
1/*
2 * Shared library add-on to iptables to add quota support
3 *
4 * Sam Johnston <samj@samj.net>
5 */
6#include <stdbool.h>
7#include <stddef.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <getopt.h>
11#include <xtables.h>
12
13#include <linux/netfilter/xt_quota.h>
14
15static const struct option quota_opts[] = {
16	{.name = "quota", .has_arg = true, .val = '1'},
17	XT_GETOPT_TABLEEND,
18};
19
20static void quota_help(void)
21{
22	printf("quota match options:\n"
23	       "[!] --quota quota		quota (bytes)\n");
24}
25
26static void
27quota_print(const void *ip, const struct xt_entry_match *match, int numeric)
28{
29	const struct xt_quota_info *q = (const void *)match->data;
30	printf("quota: %llu bytes", (unsigned long long) q->quota);
31}
32
33static void
34quota_save(const void *ip, const struct xt_entry_match *match)
35{
36	const struct xt_quota_info *q = (const void *)match->data;
37	printf("--quota %llu ", (unsigned long long) q->quota);
38}
39
40/* parse quota option */
41static int
42parse_quota(const char *s, uint64_t * quota)
43{
44	*quota = strtoull(s, NULL, 10);
45
46#ifdef DEBUG_XT_QUOTA
47	printf("Quota: %llu\n", *quota);
48#endif
49
50	if (*quota == UINT64_MAX)
51		xtables_error(PARAMETER_PROBLEM, "quota invalid: '%s'\n", s);
52	else
53		return 1;
54}
55
56static int
57quota_parse(int c, char **argv, int invert, unsigned int *flags,
58	    const void *entry, struct xt_entry_match **match)
59{
60	struct xt_quota_info *info = (struct xt_quota_info *) (*match)->data;
61
62	switch (c) {
63	case '1':
64		if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
65			xtables_error(PARAMETER_PROBLEM, "quota: unexpected '!'");
66		if (!parse_quota(optarg, &info->quota))
67			xtables_error(PARAMETER_PROBLEM,
68				   "bad quota: '%s'", optarg);
69
70		if (invert)
71			info->flags |= XT_QUOTA_INVERT;
72
73		break;
74	}
75	return 1;
76}
77
78static struct xtables_match quota_match = {
79	.family		= NFPROTO_UNSPEC,
80	.name		= "quota",
81	.version	= XTABLES_VERSION,
82	.size		= XT_ALIGN(sizeof (struct xt_quota_info)),
83	.userspacesize	= offsetof(struct xt_quota_info, master),
84	.help		= quota_help,
85	.parse		= quota_parse,
86	.print		= quota_print,
87	.save		= quota_save,
88	.extra_opts	= quota_opts,
89};
90
91void
92_init(void)
93{
94	xtables_register_match(&quota_match);
95}
96