1 /* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
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.
8 #include <linux/module.h>
11 #include <net/netfilter/nf_nat_helper.h>
12 #include <net/netfilter/nf_nat_rule.h>
13 #include <net/netfilter/nf_conntrack_helper.h>
14 #include <net/netfilter/nf_conntrack_expect.h>
15 #include <linux/netfilter/nf_conntrack_tftp.h>
17 MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
18 MODULE_DESCRIPTION("TFTP NAT helper");
19 MODULE_LICENSE("GPL");
20 MODULE_ALIAS("ip_nat_tftp");
22 static unsigned int help(struct sk_buff *skb,
23 enum ip_conntrack_info ctinfo,
24 struct nf_conntrack_expect *exp)
26 const struct nf_conn *ct = exp->master;
28 exp->saved_proto.udp.port
29 = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
30 exp->dir = IP_CT_DIR_REPLY;
31 exp->expectfn = nf_nat_follow_master;
32 if (nf_ct_expect_related(exp) != 0)
37 static void __exit nf_nat_tftp_fini(void)
39 RCU_INIT_POINTER(nf_nat_tftp_hook, NULL);
43 static int __init nf_nat_tftp_init(void)
45 BUG_ON(nf_nat_tftp_hook != NULL);
46 RCU_INIT_POINTER(nf_nat_tftp_hook, help);
50 module_init(nf_nat_tftp_init);
51 module_exit(nf_nat_tftp_fini);