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nf_conntrack_l3proto_generic.c
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1 /*
2  * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
3  *
4  * Based largely upon the original ip_conntrack code which
5  * had the following copyright information:
6  *
7  * (C) 1999-2001 Paul `Rusty' Russell
8  * (C) 2002-2004 Netfilter Core Team <[email protected]>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License version 2 as
12  * published by the Free Software Foundation.
13  *
14  * Author:
15  * Yasuyuki Kozakai @USAGI <[email protected]>
16  */
17 
18 #include <linux/types.h>
19 #include <linux/ip.h>
20 #include <linux/netfilter.h>
21 #include <linux/module.h>
22 #include <linux/skbuff.h>
23 #include <linux/icmp.h>
24 #include <linux/sysctl.h>
25 #include <net/ip.h>
26 
27 #include <linux/netfilter_ipv4.h>
33 
34 static bool generic_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
35  struct nf_conntrack_tuple *tuple)
36 {
37  memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
38  memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
39 
40  return true;
41 }
42 
43 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
44  const struct nf_conntrack_tuple *orig)
45 {
46  memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
47  memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
48 
49  return true;
50 }
51 
52 static int generic_print_tuple(struct seq_file *s,
53  const struct nf_conntrack_tuple *tuple)
54 {
55  return 0;
56 }
57 
58 static int generic_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
59  unsigned int *dataoff, u_int8_t *protonum)
60 {
61  /* Never track !!! */
62  return -NF_ACCEPT;
63 }
64 
65 
67  .l3proto = PF_UNSPEC,
68  .name = "unknown",
69  .pkt_to_tuple = generic_pkt_to_tuple,
70  .invert_tuple = generic_invert_tuple,
71  .print_tuple = generic_print_tuple,
72  .get_l4proto = generic_get_l4proto,
73 };
74 EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);