[NETFILTER]: Add nf_conntrack subsystem.
[linux-2.6.git] / net / netfilter / nf_conntrack_proto_generic.c
1 /* (C) 1999-2001 Paul `Rusty' Russell
2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License version 2 as
6  * published by the Free Software Foundation.
7  *
8  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9  *      - enable working with L3 protocol independent connection tracking.
10  *
11  * Derived from net/ipv4/netfilter/ip_conntrack_proto_generic.c
12  */
13
14 #include <linux/types.h>
15 #include <linux/sched.h>
16 #include <linux/timer.h>
17 #include <linux/netfilter.h>
18 #include <net/netfilter/nf_conntrack_protocol.h>
19
20 unsigned long nf_ct_generic_timeout = 600*HZ;
21
22 static int generic_pkt_to_tuple(const struct sk_buff *skb,
23                                 unsigned int dataoff,
24                                 struct nf_conntrack_tuple *tuple)
25 {
26         tuple->src.u.all = 0;
27         tuple->dst.u.all = 0;
28
29         return 1;
30 }
31
32 static int generic_invert_tuple(struct nf_conntrack_tuple *tuple,
33                                 const struct nf_conntrack_tuple *orig)
34 {
35         tuple->src.u.all = 0;
36         tuple->dst.u.all = 0;
37
38         return 1;
39 }
40
41 /* Print out the per-protocol part of the tuple. */
42 static int generic_print_tuple(struct seq_file *s,
43                                const struct nf_conntrack_tuple *tuple)
44 {
45         return 0;
46 }
47
48 /* Print out the private part of the conntrack. */
49 static int generic_print_conntrack(struct seq_file *s,
50                                    const struct nf_conn *state)
51 {
52         return 0;
53 }
54
55 /* Returns verdict for packet, or -1 for invalid. */
56 static int packet(struct nf_conn *conntrack,
57                   const struct sk_buff *skb,
58                   unsigned int dataoff,
59                   enum ip_conntrack_info ctinfo,
60                   int pf,
61                   unsigned int hooknum)
62 {
63         nf_ct_refresh_acct(conntrack, ctinfo, skb, nf_ct_generic_timeout);
64         return NF_ACCEPT;
65 }
66
67 /* Called when a new connection for this protocol found. */
68 static int new(struct nf_conn *conntrack, const struct sk_buff *skb,
69                unsigned int dataoff)
70 {
71         return 1;
72 }
73
74 struct nf_conntrack_protocol nf_conntrack_generic_protocol =
75 {
76         .l3proto                = PF_UNSPEC,
77         .proto                  = 0,
78         .name                   = "unknown",
79         .pkt_to_tuple           = generic_pkt_to_tuple,
80         .invert_tuple           = generic_invert_tuple,
81         .print_tuple            = generic_print_tuple,
82         .print_conntrack        = generic_print_conntrack,
83         .packet                 = packet,
84         .new                    = new,
85 };