1 files changed, 97 insertions, 0 deletions
diff --git a/extensions/libxt_quota.c b/extensions/libxt_quota.c
new file mode 100644
index 0000000..ac7c686
--- /dev/null
+++ b/extensions/libxt_quota.c
@@ -0,0 +1,97 @@
+/*
+ * 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(&quota_match);
+}