Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 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> |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 9 | #include <linux/udp.h> |
| 10 | |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 11 | #include <net/netfilter/nf_conntrack_helper.h> |
| 12 | #include <net/netfilter/nf_conntrack_expect.h> |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 13 | #include <net/netfilter/nf_nat_helper.h> |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 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 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 21 | static unsigned int help(struct sk_buff *skb, |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 22 | enum ip_conntrack_info ctinfo, |
| 23 | struct nf_conntrack_expect *exp) |
| 24 | { |
Jan Engelhardt | de24b4e | 2008-01-31 04:50:51 -0800 | [diff] [blame] | 25 | const struct nf_conn *ct = exp->master; |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 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; |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 31 | if (nf_ct_expect_related(exp) != 0) { |
| 32 | nf_ct_helper_log(skb, exp->master, "cannot add expectation"); |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 33 | return NF_DROP; |
Pablo Neira Ayuso | b20ab9cc | 2013-02-10 18:56:56 +0100 | [diff] [blame] | 34 | } |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 35 | return NF_ACCEPT; |
| 36 | } |
| 37 | |
| 38 | static void __exit nf_nat_tftp_fini(void) |
| 39 | { |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 40 | RCU_INIT_POINTER(nf_nat_tftp_hook, NULL); |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 41 | synchronize_rcu(); |
| 42 | } |
| 43 | |
| 44 | static int __init nf_nat_tftp_init(void) |
| 45 | { |
Patrick McHardy | d1332e0 | 2007-11-05 20:43:30 -0800 | [diff] [blame] | 46 | BUG_ON(nf_nat_tftp_hook != NULL); |
Stephen Hemminger | a9b3cd7 | 2011-08-01 16:19:00 +0000 | [diff] [blame] | 47 | RCU_INIT_POINTER(nf_nat_tftp_hook, help); |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | module_init(nf_nat_tftp_init); |
| 52 | module_exit(nf_nat_tftp_fini); |