net/netfilter/nf_conntrack_proto_generic.c

   1 /* (C) 1999-2001 Paul `Rusty' Russell
   2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
   9  *      - enable working with L3 protocol independent connection tracking.
  10  *
  11  * Derived from net/ipv4/netfilter/ip_conntrack_proto_generic.c
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/sched.h>
  16 #include <linux/timer.h>
  17 #include <linux/netfilter.h>
  18 #include <net/netfilter/nf_conntrack_l4proto.h>
  19
  20 static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
  21
  22 static int generic_pkt_to_tuple(const struct sk_buff *skb,
  23                                 unsigned int dataoff,
  24                                 struct nf_conntrack_tuple *tuple)
  25 {
  26         tuple->src.u.all = 0;
  27         tuple->dst.u.all = 0;
  28
  29         return 1;
  30 }
  31
  32 static int generic_invert_tuple(struct nf_conntrack_tuple *tuple,
  33                                 const struct nf_conntrack_tuple *orig)
  34 {
  35         tuple->src.u.all = 0;
  36         tuple->dst.u.all = 0;
  37
  38         return 1;
  39 }
  40
  41 /* Print out the per-protocol part of the tuple. */
  42 static int generic_print_tuple(struct seq_file *s,
  43                                const struct nf_conntrack_tuple *tuple)
  44 {
  45         return 0;
  46 }
  47
  48 /* Print out the private part of the conntrack. */
  49 static int generic_print_conntrack(struct seq_file *s,
  50                                    const struct nf_conn *state)
  51 {
  52         return 0;
  53 }
  54
  55 /* Returns verdict for packet, or -1 for invalid. */
  56 static int packet(struct nf_conn *conntrack,
  57                   const struct sk_buff *skb,
  58                   unsigned int dataoff,
  59                   enum ip_conntrack_info ctinfo,
  60                   int pf,
  61                   unsigned int hooknum)
  62 {
  63         nf_ct_refresh_acct(conntrack, ctinfo, skb, nf_ct_generic_timeout);
  64         return NF_ACCEPT;
  65 }
  66
  67 /* Called when a new connection for this protocol found. */
  68 static int new(struct nf_conn *conntrack, const struct sk_buff *skb,
  69                unsigned int dataoff)
  70 {
  71         return 1;
  72 }
  73
  74 #ifdef CONFIG_SYSCTL
  75 static struct ctl_table_header *generic_sysctl_header;
  76 static struct ctl_table generic_sysctl_table[] = {
  77         {
  78                 .ctl_name       = NET_NF_CONNTRACK_GENERIC_TIMEOUT,
  79                 .procname       = "nf_conntrack_generic_timeout",
  80                 .data           = &nf_ct_generic_timeout,
  81                 .maxlen         = sizeof(unsigned int),
  82                 .mode           = 0644,
  83                 .proc_handler   = &proc_dointvec_jiffies,
  84         },
  85         {
  86                 .ctl_name       = 0
  87         }
  88 };
  89 #endif /* CONFIG_SYSCTL */
  90
  91 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic =
  92 {
  93         .l3proto                = PF_UNSPEC,
  94         .l4proto                = 0,
  95         .name                   = "unknown",
  96         .pkt_to_tuple           = generic_pkt_to_tuple,
  97         .invert_tuple           = generic_invert_tuple,
  98         .print_tuple            = generic_print_tuple,
  99         .print_conntrack        = generic_print_conntrack,
 100         .packet                 = packet,
 101         .new                    = new,
 102 #ifdef CONFIG_SYSCTL
 103         .ctl_table_header       = &generic_sysctl_header,
 104         .ctl_table              = generic_sysctl_table,
 105 #endif
 106 };