release/src/router/iptables/extensions/libipt_quota.c

   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 <stdlib.h>
   8 #include <getopt.h>
   9 #include <iptables.h>
  10
  11 #include <linux/netfilter_ipv4/ipt_quota.h>
  12 #include <linux/netfilter_ipv4/ip_tables.h>
  13
  14 static struct option opts[] = {
  15         {"quota", 1, 0, '1'},
  16         {0}
  17 };
  18
  19 /* print usage */
  20 static void
  21 help(void)
  22 {
  23         printf("quota options:\n"
  24                " --quota quota                  quota (bytes)\n" "\n");
  25 }
  26
  27 /* print matchinfo */
  28 static void
  29 print(const struct ipt_ip *ip, const struct ipt_entry_match *match, int numeric)
  30 {
  31         struct ipt_quota_info *q = (struct ipt_quota_info *) match->data;
  32         printf("quota: %llu bytes", (unsigned long long) q->quota);
  33 }
  34
  35 /* save matchinfo */
  36 static void
  37 save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
  38 {
  39         struct ipt_quota_info *q = (struct ipt_quota_info *) match->data;
  40         printf("--quota %llu ", (unsigned long long) q->quota);
  41 }
  42
  43 /* parse quota option */
  44 static int
  45 parse_quota(const char *s, u_int64_t * quota)
  46 {
  47         *quota = strtoull(s, (char **) NULL, 10);
  48
  49 #ifdef DEBUG_IPT_QUOTA
  50         printf("Quota: %llu\n", *quota);
  51 #endif
  52
  53         if (*quota == -1)
  54                 exit_error(PARAMETER_PROBLEM, "quota invalid: '%s'\n", s);
  55         else
  56                 return 1;
  57 }
  58
  59 /* parse all options, returning true if we found any for us */
  60 static int
  61 parse(int c, char **argv, int invert, unsigned int *flags,
  62       const struct ipt_entry *entry,
  63       unsigned int *nfcache, struct ipt_entry_match **match)
  64 {
  65         struct ipt_quota_info *info = (struct ipt_quota_info *) (*match)->data;
  66
  67         switch (c) {
  68         case '1':
  69                 if (check_inverse(optarg, &invert, NULL, 0))
  70                         exit_error(PARAMETER_PROBLEM, "quota: unexpected '!'");
  71                 if (!parse_quota(optarg, &info->quota))
  72                         exit_error(PARAMETER_PROBLEM,
  73                                    "bad quota: '%s'", optarg);
  74                 break;
  75
  76         default:
  77                 return 0;
  78         }
  79         return 1;
  80 }
  81
  82 /* no final check */
  83 static void
  84 final_check(unsigned int flags)
  85 {
  86 }
  87
  88 struct iptables_match quota = {
  89         .next           = NULL,
  90         .name           = "quota",
  91         .version        = IPTABLES_VERSION,
  92         .size           = IPT_ALIGN(sizeof (struct ipt_quota_info)),
  93         .userspacesize  = IPT_ALIGN(sizeof (struct ipt_quota_info)),
  94         .help           = &help,
  95         .parse          = &parse,
  96         .final_check    = &final_check,
  97         .print          = &print,
  98         .save           = &save,
  99         .extra_opts     = opts
 100 };
 101
 102 void
 103 _init(void)
 104 {
 105         register_match(&quota);
 106 }