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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> | |
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9 | #include <linux/udp.h> |
10 | ||
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> | |
16 | ||
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"); | |
21 | ||
3db05fea | 22 | static unsigned int help(struct sk_buff *skb, |
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23 | enum ip_conntrack_info ctinfo, |
24 | struct nf_conntrack_expect *exp) | |
25 | { | |
de24b4eb | 26 | const struct nf_conn *ct = exp->master; |
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27 | |
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; | |
6823645d | 32 | if (nf_ct_expect_related(exp) != 0) |
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33 | return NF_DROP; |
34 | return NF_ACCEPT; | |
35 | } | |
36 | ||
37 | static void __exit nf_nat_tftp_fini(void) | |
38 | { | |
39 | rcu_assign_pointer(nf_nat_tftp_hook, NULL); | |
40 | synchronize_rcu(); | |
41 | } | |
42 | ||
43 | static int __init nf_nat_tftp_init(void) | |
44 | { | |
d1332e0a | 45 | BUG_ON(nf_nat_tftp_hook != NULL); |
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46 | rcu_assign_pointer(nf_nat_tftp_hook, help); |
47 | return 0; | |
48 | } | |
49 | ||
50 | module_init(nf_nat_tftp_init); | |
51 | module_exit(nf_nat_tftp_fini); |