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-rw-r--r--extensions/libxt_quota.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/extensions/libxt_quota.c b/extensions/libxt_quota.c
new file mode 100644
index 0000000..a273b29
--- /dev/null
+++ b/extensions/libxt_quota.c
@@ -0,0 +1,123 @@
+/*
+ * 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 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 void *ip, const struct xt_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 void *ip, const struct xt_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_XT_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 void *entry,
+ unsigned int *nfcache, struct xt_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 xtables_match quota = {
+ .next = NULL,
+ .family = AF_INET,
+ .name = "quota",
+ .version = IPTABLES_VERSION,
+ .size = XT_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
+};
+
+struct xtables_match quota6 = {
+ .next = NULL,
+ .family = AF_INET6,
+ .name = "quota",
+ .version = IPTABLES_VERSION,
+ .size = XT_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)
+{
+ xtables_register_match(&quota);
+ xtables_register_match(&quota6);
+}