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 <coreteam@netfilter.org>
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 <yasuyuki.kozakai@toshiba.co.jp>
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>
28 #include <net/netfilter/nf_conntrack.h>
29 #include <net/netfilter/nf_conntrack_l4proto.h>
30 #include <net/netfilter/nf_conntrack_l3proto.h>
31 #include <net/netfilter/nf_conntrack_core.h>
32 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
33
generic_pkt_to_tuple(const struct sk_buff * skb,unsigned int nhoff,struct nf_conntrack_tuple * tuple)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
generic_invert_tuple(struct nf_conntrack_tuple * tuple,const struct nf_conntrack_tuple * orig)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
generic_get_l4proto(const struct sk_buff * skb,unsigned int nhoff,unsigned int * dataoff,u_int8_t * protonum)52 static int generic_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
53 unsigned int *dataoff, u_int8_t *protonum)
54 {
55 /* Never track !!! */
56 return -NF_ACCEPT;
57 }
58
59
60 struct nf_conntrack_l3proto nf_conntrack_l3proto_generic __read_mostly = {
61 .l3proto = PF_UNSPEC,
62 .pkt_to_tuple = generic_pkt_to_tuple,
63 .invert_tuple = generic_invert_tuple,
64 .get_l4proto = generic_get_l4proto,
65 };
66 EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);
67