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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a536df35 | 2 | /* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu> |
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3 | */ |
4 | ||
5 | #include <linux/module.h> | |
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6 | #include <linux/udp.h> |
7 | ||
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8 | #include <net/netfilter/nf_conntrack_helper.h> |
9 | #include <net/netfilter/nf_conntrack_expect.h> | |
1afc5679 | 10 | #include <net/netfilter/nf_nat_helper.h> |
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11 | #include <linux/netfilter/nf_conntrack_tftp.h> |
12 | ||
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13 | #define NAT_HELPER_NAME "tftp" |
14 | ||
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15 | MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>"); |
16 | MODULE_DESCRIPTION("TFTP NAT helper"); | |
17 | MODULE_LICENSE("GPL"); | |
53b11308 FL |
18 | MODULE_ALIAS_NF_NAT_HELPER(NAT_HELPER_NAME); |
19 | ||
20 | static struct nf_conntrack_nat_helper nat_helper_tftp = | |
21 | NF_CT_NAT_HELPER_INIT(NAT_HELPER_NAME); | |
a536df35 | 22 | |
3db05fea | 23 | static unsigned int help(struct sk_buff *skb, |
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24 | enum ip_conntrack_info ctinfo, |
25 | struct nf_conntrack_expect *exp) | |
26 | { | |
de24b4eb | 27 | const struct nf_conn *ct = exp->master; |
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28 | |
29 | exp->saved_proto.udp.port | |
30 | = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port; | |
31 | exp->dir = IP_CT_DIR_REPLY; | |
32 | exp->expectfn = nf_nat_follow_master; | |
3c00fb0b | 33 | if (nf_ct_expect_related(exp, 0) != 0) { |
b20ab9cc | 34 | nf_ct_helper_log(skb, exp->master, "cannot add expectation"); |
a536df35 | 35 | return NF_DROP; |
b20ab9cc | 36 | } |
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37 | return NF_ACCEPT; |
38 | } | |
39 | ||
40 | static void __exit nf_nat_tftp_fini(void) | |
41 | { | |
53b11308 | 42 | nf_nat_helper_unregister(&nat_helper_tftp); |
a9b3cd7f | 43 | RCU_INIT_POINTER(nf_nat_tftp_hook, NULL); |
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44 | synchronize_rcu(); |
45 | } | |
46 | ||
47 | static int __init nf_nat_tftp_init(void) | |
48 | { | |
d1332e0a | 49 | BUG_ON(nf_nat_tftp_hook != NULL); |
53b11308 | 50 | nf_nat_helper_register(&nat_helper_tftp); |
a9b3cd7f | 51 | RCU_INIT_POINTER(nf_nat_tftp_hook, help); |
a536df35 PM |
52 | return 0; |
53 | } | |
54 | ||
55 | module_init(nf_nat_tftp_init); | |
56 | module_exit(nf_nat_tftp_fini); |