linux/net/netfilter/nf_nat_tftp.c
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   1/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
   2 *
   3 * This program is free software; you can redistribute it and/or modify
   4 * it under the terms of the GNU General Public License version 2 as
   5 * published by the Free Software Foundation.
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/udp.h>
  10
  11#include <net/netfilter/nf_conntrack_helper.h>
  12#include <net/netfilter/nf_conntrack_expect.h>
  13#include <net/netfilter/nf_nat_helper.h>
  14#include <linux/netfilter/nf_conntrack_tftp.h>
  15
  16MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
  17MODULE_DESCRIPTION("TFTP NAT helper");
  18MODULE_LICENSE("GPL");
  19MODULE_ALIAS("ip_nat_tftp");
  20
  21static unsigned int help(struct sk_buff *skb,
  22                         enum ip_conntrack_info ctinfo,
  23                         struct nf_conntrack_expect *exp)
  24{
  25        const struct nf_conn *ct = exp->master;
  26
  27        exp->saved_proto.udp.port
  28                = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
  29        exp->dir = IP_CT_DIR_REPLY;
  30        exp->expectfn = nf_nat_follow_master;
  31        if (nf_ct_expect_related(exp) != 0) {
  32                nf_ct_helper_log(skb, exp->master, "cannot add expectation");
  33                return NF_DROP;
  34        }
  35        return NF_ACCEPT;
  36}
  37
  38static void __exit nf_nat_tftp_fini(void)
  39{
  40        RCU_INIT_POINTER(nf_nat_tftp_hook, NULL);
  41        synchronize_rcu();
  42}
  43
  44static int __init nf_nat_tftp_init(void)
  45{
  46        BUG_ON(nf_nat_tftp_hook != NULL);
  47        RCU_INIT_POINTER(nf_nat_tftp_hook, help);
  48        return 0;
  49}
  50
  51module_init(nf_nat_tftp_init);
  52module_exit(nf_nat_tftp_fini);
  53
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