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      1 /*
      2  * Shared library add-on to iptables to add quota support
      3  *
      4  * Sam Johnston <samj (at) samj.net>
      5  */
      6 #include <stdio.h>
      7 #include <xtables.h>
      8 #include <linux/netfilter/xt_quota.h>
      9 
     10 enum {
     11 	O_QUOTA = 0,
     12 };
     13 
     14 static 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 
     21 static void quota_help(void)
     22 {
     23 	printf("quota match options:\n"
     24 	       "[!] --quota quota		quota (bytes)\n");
     25 }
     26 
     27 static void
     28 quota_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 
     34 static void
     35 quota_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 
     44 static 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 
     54 static 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 
     67 void
     68 _init(void)
     69 {
     70 	xtables_register_match(&quota_match);
     71 }
     72