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
   9 #include <linux/types.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/timer.h>
  12 #include <linux/netfilter.h>
  13 #include <net/netfilter/nf_conntrack_l4proto.h>
  14
  15 static unsigned int nf_ct_generic_timeout __read_mostly = 600*HZ;
  16
  17 static bool generic_pkt_to_tuple(const struct sk_buff *skb,
  18                                  unsigned int dataoff,
  19                                  struct nf_conntrack_tuple *tuple)
  20 {
  21         tuple->src.u.all = 0;
  22         tuple->dst.u.all = 0;
  23
  24         return true;
  25 }
  26
  27 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
  28                                  const struct nf_conntrack_tuple *orig)
  29 {
  30         tuple->src.u.all = 0;
  31         tuple->dst.u.all = 0;
  32
  33         return true;
  34 }
  35
  36 /* Print out the per-protocol part of the tuple. */
  37 static int generic_print_tuple(struct seq_file *s,
  38                                const struct nf_conntrack_tuple *tuple)
  39 {
  40         return 0;
  41 }
  42
  43 /* Returns verdict for packet, or -1 for invalid. */
  44 static int packet(struct nf_conn *ct,
  45                   const struct sk_buff *skb,
  46                   unsigned int dataoff,
  47                   enum ip_conntrack_info ctinfo,
  48                   u_int8_t pf,
  49                   unsigned int hooknum)
  50 {
  51         nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_generic_timeout);
  52         return NF_ACCEPT;
  53 }
  54
  55 /* Called when a new connection for this protocol found. */
  56 static bool new(struct nf_conn *ct, const struct sk_buff *skb,
  57                 unsigned int dataoff)
  58 {
  59         return true;
  60 }
  61
  62 #ifdef CONFIG_SYSCTL
  63 static struct ctl_table_header *generic_sysctl_header;
  64 static struct ctl_table generic_sysctl_table[] = {
  65         {
  66                 .procname       = "nf_conntrack_generic_timeout",
  67                 .data           = &nf_ct_generic_timeout,
  68                 .maxlen         = sizeof(unsigned int),
  69                 .mode           = 0644,
  70                 .proc_handler   = proc_dointvec_jiffies,
  71         },
  72         { }
  73 };
  74 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
  75 static struct ctl_table generic_compat_sysctl_table[] = {
  76         {
  77                 .procname       = "ip_conntrack_generic_timeout",
  78                 .data           = &nf_ct_generic_timeout,
  79                 .maxlen         = sizeof(unsigned int),
  80                 .mode           = 0644,
  81                 .proc_handler   = proc_dointvec_jiffies,
  82         },
  83         { }
  84 };
  85 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
  86 #endif /* CONFIG_SYSCTL */
  87
  88 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
  89 {
  90         .l3proto                = PF_UNSPEC,
  91         .l4proto                = 255,
  92         .name                   = "unknown",
  93         .pkt_to_tuple           = generic_pkt_to_tuple,
  94         .invert_tuple           = generic_invert_tuple,
  95         .print_tuple            = generic_print_tuple,
  96         .packet                 = packet,
  97         .new                    = new,
  98 #ifdef CONFIG_SYSCTL
  99         .ctl_table_header       = &generic_sysctl_header,
 100         .ctl_table              = generic_sysctl_table,
 101 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 102         .ctl_compat_table       = generic_compat_sysctl_table,
 103 #endif
 104 #endif
 105 };