linux/net/netfilter/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 <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
  34static 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
  43static 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
  52static int generic_print_tuple(struct seq_file *s,
  53                            const struct nf_conntrack_tuple *tuple)
  54{
  55        return 0;
  56}
  57
  58static 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
  66struct nf_conntrack_l3proto nf_conntrack_l3proto_generic __read_mostly = {
  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};
  74EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);
  75
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