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ebt_redirect.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <getopt.h>
#include "../include/ebtables_u.h"
#include <linux/netfilter_bridge/ebt_redirect.h>

#define REDIRECT_TARGET '1'
static struct option opts[] =
{
      { "redirect-target", required_argument, 0, REDIRECT_TARGET },
      { 0 }
};

static void print_help()
{
      printf(
      "redirect option:\n"
      " --redirect-target target   : ACCEPT, DROP, RETURN or CONTINUE\n");
}

static void init(struct ebt_entry_target *target)
{
      struct ebt_redirect_info *redirectinfo =
         (struct ebt_redirect_info *)target->data;

      redirectinfo->target = EBT_ACCEPT;
      return;
}

#define OPT_REDIRECT_TARGET  0x01
static int parse(int c, char **argv, int argc,
   const struct ebt_u_entry *entry, unsigned int *flags,
   struct ebt_entry_target **target)
{
      struct ebt_redirect_info *redirectinfo =
         (struct ebt_redirect_info *)(*target)->data;

      switch (c) {
      case REDIRECT_TARGET:
            check_option(flags, OPT_REDIRECT_TARGET);
            if (FILL_TARGET(optarg, redirectinfo->target))
                  print_error("Illegal --redirect-target target");
            break;
      default:
            return 0;
      }
      return 1;
}

static void final_check(const struct ebt_u_entry *entry,
   const struct ebt_entry_target *target, const char *name,
   unsigned int hookmask, unsigned int time)
{
      struct ebt_redirect_info *redirectinfo =
         (struct ebt_redirect_info *)target->data;

      if (BASE_CHAIN && redirectinfo->target == EBT_RETURN)
            print_error("--redirect-target RETURN not allowed on "
                        "base chain");
      CLEAR_BASE_CHAIN_BIT;
      if ( ((hookmask & ~(1 << NF_BR_PRE_ROUTING)) || strcmp(name, "nat")) &&
         ((hookmask & ~(1 << NF_BR_BROUTING)) || strcmp(name, "broute")) )
            print_error("Wrong chain for redirect");
}

static void print(const struct ebt_u_entry *entry,
   const struct ebt_entry_target *target)
{
      struct ebt_redirect_info *redirectinfo =
         (struct ebt_redirect_info *)target->data;

      if (redirectinfo->target == EBT_ACCEPT)
            return;
      printf(" --redirect-target %s", TARGET_NAME(redirectinfo->target));
}

static int compare(const struct ebt_entry_target *t1,
   const struct ebt_entry_target *t2)
{
      struct ebt_redirect_info *redirectinfo1 =
         (struct ebt_redirect_info *)t1->data;
      struct ebt_redirect_info *redirectinfo2 =
         (struct ebt_redirect_info *)t2->data;

      return redirectinfo1->target == redirectinfo2->target;
}

static struct ebt_u_target redirect_target =
{
      .name       = EBT_REDIRECT_TARGET,
      .size       = sizeof(struct ebt_redirect_info),
      .help       = print_help,
      .init       = init,
      .parse            = parse,
      .final_check      = final_check,
      .print            = print,
      .compare    = compare,
      .extra_ops  = opts,
};

static void _init(void) __attribute__ ((constructor));
static void _init(void)
{
      register_target(&redirect_target);
}

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