release/src/router/iptables/extensions/libip6t_NFQUEUE.c

   1 /* Shared library add-on to ip666666tables for NFQ
   2  *
   3  * (C) 2005 by Harald Welte <laforge@netfilter.org>
   4  *
   5  * This program is distributed under the terms of GNU GPL v2, 1991
   6  *
   7  */
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11 #include <getopt.h>
  12
  13 #include <ip6tables.h>
  14 #include <linux/netfilter_ipv6/ip6_tables.h>
  15 #include <linux/netfilter_ipv4/ipt_NFQUEUE.h>
  16
  17 static void init(struct ip6t_entry_target *t, unsigned int *nfcache)
  18 {
  19 }
  20
  21 static void help(void)
  22 {
  23         printf(
  24 "NFQUEUE target options\n"
  25 "  --queue-num value            Send packet to QUEUE number <value>.\n"
  26 "                               Valid queue numbers are 0-65535\n"
  27 );
  28 }
  29
  30 static struct option opts[] = {
  31         { "queue-num", 1, 0, 'F' },
  32         { 0 }
  33 };
  34
  35 static void
  36 parse_num(const char *s, struct ipt_NFQ_info *tinfo)
  37 {
  38         unsigned int num;
  39
  40         if (string_to_number(s, 0, 65535, &num) == -1)
  41                 exit_error(PARAMETER_PROBLEM,
  42                            "Invalid queue number `%s'\n", s);
  43
  44         tinfo->queuenum = num & 0xffff;
  45         return;
  46 }
  47
  48 static int
  49 parse(int c, char **argv, int invert, unsigned int *flags,
  50       const struct ip6t_entry *entry,
  51       struct ip6t_entry_target **target)
  52 {
  53         struct ipt_NFQ_info *tinfo
  54                 = (struct ipt_NFQ_info *)(*target)->data;
  55
  56         switch (c) {
  57         case 'F':
  58                 if (*flags)
  59                         exit_error(PARAMETER_PROBLEM, "NFQUEUE target: "
  60                                    "Only use --queue-num ONCE!");
  61                 parse_num(optarg, tinfo);
  62                 break;
  63         default:
  64                 return 0;
  65         }
  66
  67         return 1;
  68 }
  69
  70 static void
  71 final_check(unsigned int flags)
  72 {
  73 }
  74
  75 /* Prints out the targinfo. */
  76 static void
  77 print(const struct ip6t_ip6 *ip,
  78       const struct ip6t_entry_target *target,
  79       int numeric)
  80 {
  81         const struct ipt_NFQ_info *tinfo =
  82                 (const struct ipt_NFQ_info *)target->data;
  83         printf("NFQUEUE num %u", tinfo->queuenum);
  84 }
  85
  86 /* Saves the union ip6t_targinfo in parsable form to stdout. */
  87 static void
  88 save(const struct ip6t_ip6 *ip, const struct ip6t_entry_target *target)
  89 {
  90         const struct ipt_NFQ_info *tinfo =
  91                 (const struct ipt_NFQ_info *)target->data;
  92
  93         printf("--queue-num %u ", tinfo->queuenum);
  94 }
  95
  96 static struct ip6tables_target nfqueue = {
  97         .next           = NULL,
  98         .name           = "NFQUEUE",
  99         .version        = IPTABLES_VERSION,
 100         .size           = IP6T_ALIGN(sizeof(struct ipt_NFQ_info)),
 101         .userspacesize  = IP6T_ALIGN(sizeof(struct ipt_NFQ_info)),
 102         .help           = &help,
 103         .init           = &init,
 104         .parse          = &parse,
 105         .final_check    = &final_check,
 106         .print          = &print,
 107         .save           = &save,
 108         .extra_opts     = opts
 109 };
 110
 111 void _init(void)
 112 {
 113         register_target6(&nfqueue);
 114 }