net/netfilter/nf_conntrack_l3proto_generic.c

   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
  34 #if 0
  35 #define DEBUGP printk
  36 #else
  37 #define DEBUGP(format, args...)
  38 #endif
  39
  40 static int generic_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
  41                                 struct nf_conntrack_tuple *tuple)
  42 {
  43         memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
  44         memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
  45
  46         return 1;
  47 }
  48
  49 static int generic_invert_tuple(struct nf_conntrack_tuple *tuple,
  50                            const struct nf_conntrack_tuple *orig)
  51 {
  52         memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
  53         memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
  54
  55         return 1;
  56 }
  57
  58 static int generic_print_tuple(struct seq_file *s,
  59                             const struct nf_conntrack_tuple *tuple)
  60 {
  61         return 0;
  62 }
  63
  64 static int generic_print_conntrack(struct seq_file *s,
  65                                 const struct nf_conn *conntrack)
  66 {
  67         return 0;
  68 }
  69
  70 static int
  71 generic_prepare(struct sk_buff **pskb, unsigned int hooknum,
  72                 unsigned int *dataoff, u_int8_t *protonum)
  73 {
  74         /* Never track !!! */
  75         return -NF_ACCEPT;
  76 }
  77
  78
  79 static u_int32_t generic_get_features(const struct nf_conntrack_tuple *tuple)
  80
  81 {
  82         return NF_CT_F_BASIC;
  83 }
  84
  85 struct nf_conntrack_l3proto nf_conntrack_l3proto_generic = {
  86         .l3proto         = PF_UNSPEC,
  87         .name            = "unknown",
  88         .pkt_to_tuple    = generic_pkt_to_tuple,
  89         .invert_tuple    = generic_invert_tuple,
  90         .print_tuple     = generic_print_tuple,
  91         .print_conntrack = generic_print_conntrack,
  92         .prepare         = generic_prepare,
  93         .get_features    = generic_get_features,
  94 };
  95 EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);