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- /* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * Version: 0.0.7
- *
- * Thu 21 Mar 2002 Harald Welte <laforge@gnumonks.org>
- * - Port to newnat API
- *
- * This module currently supports DNAT:
- * iptables -t nat -A PREROUTING -d x.x.x.x -j DNAT --to-dest x.x.x.y
- *
- * and SNAT:
- * iptables -t nat -A POSTROUTING { -j MASQUERADE , -j SNAT --to-source x.x.x.x }
- *
- * It has not been tested with
- * -j SNAT --to-source x.x.x.x-x.x.x.y since I only have one external ip
- * If you do test this please let me know if it works or not.
- *
- */
- #include <linux/module.h>
- #include <linux/netfilter_ipv4.h>
- #include <linux/ip.h>
- #include <linux/udp.h>
- #include <linux/netfilter.h>
- #include <linux/netfilter_ipv4/ip_tables.h>
- #include <linux/netfilter_ipv4/ip_conntrack_helper.h>
- #include <linux/netfilter_ipv4/ip_conntrack_tftp.h>
- #include <linux/netfilter_ipv4/ip_nat_helper.h>
- #include <linux/netfilter_ipv4/ip_nat_rule.h>
- #include <linux/moduleparam.h>
- MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
- MODULE_DESCRIPTION("tftp NAT helper");
- MODULE_LICENSE("GPL");
- static unsigned int help(struct sk_buff **pskb,
- enum ip_conntrack_info ctinfo,
- struct ip_conntrack_expect *exp)
- {
- struct ip_conntrack *ct = exp->master;
- exp->saved_proto.udp.port
- = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
- exp->dir = IP_CT_DIR_REPLY;
- exp->expectfn = ip_nat_follow_master;
- if (ip_conntrack_expect_related(exp) != 0)
- return NF_DROP;
- return NF_ACCEPT;
- }
- static void __exit ip_nat_tftp_fini(void)
- {
- rcu_assign_pointer(ip_nat_tftp_hook, NULL);
- synchronize_rcu();
- }
- static int __init ip_nat_tftp_init(void)
- {
- BUG_ON(rcu_dereference(ip_nat_tftp_hook));
- rcu_assign_pointer(ip_nat_tftp_hook, help);
- return 0;
- }
- module_init(ip_nat_tftp_init);
- module_exit(ip_nat_tftp_fini);
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