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 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
  66 struct 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 };
  74 EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_generic);