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> |
| 9 | #include <linux/moduleparam.h> |
| 10 | #include <linux/udp.h> |
| 11 | |
| 12 | #include <net/netfilter/nf_nat_helper.h> |
| 13 | #include <net/netfilter/nf_nat_rule.h> |
| 14 | #include <net/netfilter/nf_conntrack_helper.h> |
| 15 | #include <net/netfilter/nf_conntrack_expect.h> |
| 16 | #include <linux/netfilter/nf_conntrack_tftp.h> |
| 17 | |
| 18 | MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>"); |
| 19 | MODULE_DESCRIPTION("TFTP NAT helper"); |
| 20 | MODULE_LICENSE("GPL"); |
| 21 | MODULE_ALIAS("ip_nat_tftp"); |
| 22 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 23 | static unsigned int help(struct sk_buff *skb, |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 24 | enum ip_conntrack_info ctinfo, |
| 25 | struct nf_conntrack_expect *exp) |
| 26 | { |
Jan Engelhardt | de24b4e | 2008-01-31 04:50:51 -0800 | [diff] [blame] | 27 | const struct nf_conn *ct = exp->master; |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 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; |
Patrick McHardy | 6823645 | 2007-07-07 22:30:49 -0700 | [diff] [blame] | 33 | if (nf_ct_expect_related(exp) != 0) |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 34 | return NF_DROP; |
| 35 | return NF_ACCEPT; |
| 36 | } |
| 37 | |
| 38 | static void __exit nf_nat_tftp_fini(void) |
| 39 | { |
| 40 | rcu_assign_pointer(nf_nat_tftp_hook, NULL); |
| 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); |
Patrick McHardy | a536df3 | 2006-12-02 22:10:18 -0800 | [diff] [blame] | 47 | rcu_assign_pointer(nf_nat_tftp_hook, help); |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | module_init(nf_nat_tftp_init); |
| 52 | module_exit(nf_nat_tftp_fini); |