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 nf_generic_should_process(u8 proto)
  18 {
  19         switch (proto) {
  20 #ifdef CONFIG_NF_CT_PROTO_SCTP_MODULE
  21         case IPPROTO_SCTP:
  22                 return false;
  23 #endif
  24 #ifdef CONFIG_NF_CT_PROTO_DCCP_MODULE
  25         case IPPROTO_DCCP:
  26                 return false;
  27 #endif
  28 #ifdef CONFIG_NF_CT_PROTO_GRE_MODULE
  29         case IPPROTO_GRE:
  30                 return false;
  31 #endif
  32 #ifdef CONFIG_NF_CT_PROTO_UDPLITE_MODULE
  33         case IPPROTO_UDPLITE:
  34                 return false;
  35 #endif
  36         default:
  37                 return true;
  38         }
  39 }
  40
  41 static bool generic_pkt_to_tuple(const struct sk_buff *skb,
  42                                  unsigned int dataoff,
  43                                  struct nf_conntrack_tuple *tuple)
  44 {
  45         tuple->src.u.all = 0;
  46         tuple->dst.u.all = 0;
  47
  48         return true;
  49 }
  50
  51 static bool generic_invert_tuple(struct nf_conntrack_tuple *tuple,
  52                                  const struct nf_conntrack_tuple *orig)
  53 {
  54         tuple->src.u.all = 0;
  55         tuple->dst.u.all = 0;
  56
  57         return true;
  58 }
  59
  60 /* Print out the per-protocol part of the tuple. */
  61 static int generic_print_tuple(struct seq_file *s,
  62                                const struct nf_conntrack_tuple *tuple)
  63 {
  64         return 0;
  65 }
  66
  67 /* Returns verdict for packet, or -1 for invalid. */
  68 static int packet(struct nf_conn *ct,
  69                   const struct sk_buff *skb,
  70                   unsigned int dataoff,
  71                   enum ip_conntrack_info ctinfo,
  72                   u_int8_t pf,
  73                   unsigned int hooknum)
  74 {
  75         nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_generic_timeout);
  76         return NF_ACCEPT;
  77 }
  78
  79 /* Called when a new connection for this protocol found. */
  80 static bool new(struct nf_conn *ct, const struct sk_buff *skb,
  81                 unsigned int dataoff)
  82 {
  83         return nf_generic_should_process(nf_ct_protonum(ct));
  84 }
  85
  86 #ifdef CONFIG_SYSCTL
  87 static struct ctl_table_header *generic_sysctl_header;
  88 static struct ctl_table generic_sysctl_table[] = {
  89         {
  90                 .procname       = "nf_conntrack_generic_timeout",
  91                 .data           = &nf_ct_generic_timeout,
  92                 .maxlen         = sizeof(unsigned int),
  93                 .mode           = 0644,
  94                 .proc_handler   = proc_dointvec_jiffies,
  95         },
  96         { }
  97 };
  98 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
  99 static struct ctl_table generic_compat_sysctl_table[] = {
 100         {
 101                 .procname       = "ip_conntrack_generic_timeout",
 102                 .data           = &nf_ct_generic_timeout,
 103                 .maxlen         = sizeof(unsigned int),
 104                 .mode           = 0644,
 105                 .proc_handler   = proc_dointvec_jiffies,
 106         },
 107         { }
 108 };
 109 #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
 110 #endif /* CONFIG_SYSCTL */
 111
 112 struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
 113 {
 114         .l3proto                = PF_UNSPEC,
 115         .l4proto                = 255,
 116         .name                   = "unknown",
 117         .pkt_to_tuple           = generic_pkt_to_tuple,
 118         .invert_tuple           = generic_invert_tuple,
 119         .print_tuple            = generic_print_tuple,
 120         .packet                 = packet,
 121         .new                    = new,
 122 #ifdef CONFIG_SYSCTL
 123         .ctl_table_header       = &generic_sysctl_header,
 124         .ctl_table              = generic_sysctl_table,
 125 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
 126         .ctl_compat_table       = generic_compat_sysctl_table,
 127 #endif
 128 #endif
 129 };