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/config.h>
  19 #include <linux/types.h>
  20 #include <linux/ip.h>
  21 #include <linux/netfilter.h>
  22 #include <linux/module.h>
  23 #include <linux/skbuff.h>
  24 #include <linux/icmp.h>
  25 #include <linux/sysctl.h>
  26 #include <net/ip.h>
  27
  28 #include <linux/netfilter_ipv4.h>
  29 #include <net/netfilter/nf_conntrack.h>
  30 #include <net/netfilter/nf_conntrack_protocol.h>
  31 #include <net/netfilter/nf_conntrack_l3proto.h>
  32 #include <net/netfilter/nf_conntrack_core.h>
  33 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
  34
  35 #if 0
  36 #define DEBUGP printk
  37 #else
  38 #define DEBUGP(format, args...)
  39 #endif
  40
  41 DECLARE_PER_CPU(struct nf_conntrack_stat, nf_conntrack_stat);
  42
  43 static int generic_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
  44                                 struct nf_conntrack_tuple *tuple)
  45 {
  46         memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
  47         memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
  48
  49         return 1;
  50 }
  51
  52 static int generic_invert_tuple(struct nf_conntrack_tuple *tuple,
  53                            const struct nf_conntrack_tuple *orig)
  54 {
  55         memset(&tuple->src.u3, 0, sizeof(tuple->src.u3));
  56         memset(&tuple->dst.u3, 0, sizeof(tuple->dst.u3));
  57
  58         return 1;
  59 }
  60
  61 static int generic_print_tuple(struct seq_file *s,
  62                             const struct nf_conntrack_tuple *tuple)
  63 {
  64         return 0;
  65 }
  66
  67 static int generic_print_conntrack(struct seq_file *s,
  68                                 const struct nf_conn *conntrack)
  69 {
  70         return 0;
  71 }
  72
  73 static int
  74 generic_prepare(struct sk_buff **pskb, unsigned int hooknum,
  75                 unsigned int *dataoff, u_int8_t *protonum)
  76 {
  77         /* Never track !!! */
  78         return -NF_ACCEPT;
  79 }
  80
  81
  82 static u_int32_t generic_get_features(const struct nf_conntrack_tuple *tuple)
  83
  84 {
  85         return NF_CT_F_BASIC;
  86 }
  87
  88 struct nf_conntrack_l3proto nf_conntrack_generic_l3proto = {
  89         .l3proto         = PF_UNSPEC,
  90         .name            = "unknown",
  91         .pkt_to_tuple    = generic_pkt_to_tuple,
  92         .invert_tuple    = generic_invert_tuple,
  93         .print_tuple     = generic_print_tuple,
  94         .print_conntrack = generic_print_conntrack,
  95         .prepare         = generic_prepare,
  96         .get_features    = generic_get_features,
  97 };