Diff markup
1 /* Amanda extension for TCP NAT alteration. 1 /* Amanda extension for TCP NAT alteration.
2 * (C) 2002 by Brian J. Murrell <netfilter@int 2 * (C) 2002 by Brian J. Murrell <netfilter@interlinx.bc.ca>
3 * based on a copy of HW's ip_nat_irc.c as wel 3 * based on a copy of HW's ip_nat_irc.c as well as other modules
4 * 4 *
5 * This program is free software; you can redi 5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Genera 6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundatio 7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any l 8 * 2 of the License, or (at your option) any later version.
9 */ 9 */
10 10
11 #include <linux/kernel.h> 11 #include <linux/kernel.h>
12 #include <linux/module.h> 12 #include <linux/module.h>
13 #include <linux/skbuff.h> 13 #include <linux/skbuff.h>
14 #include <linux/udp.h> 14 #include <linux/udp.h>
15 15
16 #include <net/netfilter/nf_nat_helper.h> 16 #include <net/netfilter/nf_nat_helper.h>
17 #include <net/netfilter/nf_nat_rule.h> 17 #include <net/netfilter/nf_nat_rule.h>
18 #include <net/netfilter/nf_conntrack_helper.h> 18 #include <net/netfilter/nf_conntrack_helper.h>
19 #include <net/netfilter/nf_conntrack_expect.h> 19 #include <net/netfilter/nf_conntrack_expect.h>
20 #include <linux/netfilter/nf_conntrack_amanda. 20 #include <linux/netfilter/nf_conntrack_amanda.h>
21 21
22 MODULE_AUTHOR("Brian J. Murrell <netfilter@int 22 MODULE_AUTHOR("Brian J. Murrell <netfilter@interlinx.bc.ca>");
23 MODULE_DESCRIPTION("Amanda NAT helper"); 23 MODULE_DESCRIPTION("Amanda NAT helper");
24 MODULE_LICENSE("GPL"); 24 MODULE_LICENSE("GPL");
25 MODULE_ALIAS("ip_nat_amanda"); 25 MODULE_ALIAS("ip_nat_amanda");
26 26
27 static unsigned int help(struct sk_buff *skb, 27 static unsigned int help(struct sk_buff *skb,
28 enum ip_conntrack_inf 28 enum ip_conntrack_info ctinfo,
29 unsigned int matchoff 29 unsigned int matchoff,
30 unsigned int matchlen 30 unsigned int matchlen,
31 struct nf_conntrack_e 31 struct nf_conntrack_expect *exp)
32 { 32 {
33 char buffer[sizeof("65535")]; 33 char buffer[sizeof("65535")];
34 u_int16_t port; 34 u_int16_t port;
35 unsigned int ret; 35 unsigned int ret;
36 36
37 /* Connection comes from client. */ 37 /* Connection comes from client. */
38 exp->saved_proto.tcp.port = exp->tuple 38 exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
39 exp->dir = IP_CT_DIR_ORIGINAL; 39 exp->dir = IP_CT_DIR_ORIGINAL;
40 40
41 /* When you see the packet, we need to 41 /* When you see the packet, we need to NAT it the same as the
42 * this one (ie. same IP: it will be T 42 * this one (ie. same IP: it will be TCP and master is UDP). */
43 exp->expectfn = nf_nat_follow_master; 43 exp->expectfn = nf_nat_follow_master;
44 44
45 /* Try to get same port: if not, try t 45 /* Try to get same port: if not, try to change it. */
46 for (port = ntohs(exp->saved_proto.tcp 46 for (port = ntohs(exp->saved_proto.tcp.port); port != 0; port++) {
47 exp->tuple.dst.u.tcp.port = ht 47 exp->tuple.dst.u.tcp.port = htons(port);
48 if (nf_ct_expect_related(exp) 48 if (nf_ct_expect_related(exp) == 0)
49 break; 49 break;
50 } 50 }
51 51
52 if (port == 0) 52 if (port == 0)
53 return NF_DROP; 53 return NF_DROP;
54 54
55 sprintf(buffer, "%u", port); 55 sprintf(buffer, "%u", port);
56 ret = nf_nat_mangle_udp_packet(skb, ex 56 ret = nf_nat_mangle_udp_packet(skb, exp->master, ctinfo,
57 matchof 57 matchoff, matchlen,
58 buffer, 58 buffer, strlen(buffer));
59 if (ret != NF_ACCEPT) 59 if (ret != NF_ACCEPT)
60 nf_ct_unexpect_related(exp); 60 nf_ct_unexpect_related(exp);
61 return ret; 61 return ret;
62 } 62 }
63 63
64 static void __exit nf_nat_amanda_fini(void) 64 static void __exit nf_nat_amanda_fini(void)
65 { 65 {
66 rcu_assign_pointer(nf_nat_amanda_hook, 66 rcu_assign_pointer(nf_nat_amanda_hook, NULL);
67 synchronize_rcu(); 67 synchronize_rcu();
68 } 68 }
69 69
70 static int __init nf_nat_amanda_init(void) 70 static int __init nf_nat_amanda_init(void)
71 { 71 {
72 BUG_ON(nf_nat_amanda_hook != NULL); 72 BUG_ON(nf_nat_amanda_hook != NULL);
73 rcu_assign_pointer(nf_nat_amanda_hook, 73 rcu_assign_pointer(nf_nat_amanda_hook, help);
74 return 0; 74 return 0;
75 } 75 }
76 76
77 module_init(nf_nat_amanda_init); 77 module_init(nf_nat_amanda_init);
78 module_exit(nf_nat_amanda_fini); 78 module_exit(nf_nat_amanda_fini);
79 79
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