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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 | ||
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11 | #include <net/netfilter/nf_conntrack_helper.h> |
12 | #include <net/netfilter/nf_conntrack_expect.h> | |
1afc5679 | 13 | #include <net/netfilter/nf_nat_helper.h> |
a536df35 PM |
14 | #include <linux/netfilter/nf_conntrack_tftp.h> |
15 | ||
16 | MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>"); | |
17 | MODULE_DESCRIPTION("TFTP NAT helper"); | |
18 | MODULE_LICENSE("GPL"); | |
19 | MODULE_ALIAS("ip_nat_tftp"); | |
20 | ||
3db05fea | 21 | static unsigned int help(struct sk_buff *skb, |
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22 | enum ip_conntrack_info ctinfo, |
23 | struct nf_conntrack_expect *exp) | |
24 | { | |
de24b4eb | 25 | const struct nf_conn *ct = exp->master; |
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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; | |
b20ab9cc PNA |
31 | if (nf_ct_expect_related(exp) != 0) { |
32 | nf_ct_helper_log(skb, exp->master, "cannot add expectation"); | |
a536df35 | 33 | return NF_DROP; |
b20ab9cc | 34 | } |
a536df35 PM |
35 | return NF_ACCEPT; |
36 | } | |
37 | ||
38 | static void __exit nf_nat_tftp_fini(void) | |
39 | { | |
a9b3cd7f | 40 | RCU_INIT_POINTER(nf_nat_tftp_hook, NULL); |
a536df35 PM |
41 | synchronize_rcu(); |
42 | } | |
43 | ||
44 | static int __init nf_nat_tftp_init(void) | |
45 | { | |
d1332e0a | 46 | BUG_ON(nf_nat_tftp_hook != NULL); |
a9b3cd7f | 47 | RCU_INIT_POINTER(nf_nat_tftp_hook, help); |
a536df35 PM |
48 | return 0; |
49 | } | |
50 | ||
51 | module_init(nf_nat_tftp_init); | |
52 | module_exit(nf_nat_tftp_fini); |