net/ipv4/netfilter/ip_nat_proto_unknown.c

   1 /* The "unknown" protocol.  This is what is used for protocols we
   2  * don't understand.  It's returned by ip_ct_find_proto().
   3  */
   4
   5 /* (C) 1999-2001 Paul `Rusty' Russell
   6  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/types.h>
  14 #include <linux/init.h>
  15 #include <linux/netfilter.h>
  16 #include <linux/if.h>
  17
  18 #include <linux/netfilter_ipv4/ip_nat.h>
  19 #include <linux/netfilter_ipv4/ip_nat_rule.h>
  20 #include <linux/netfilter_ipv4/ip_nat_protocol.h>
  21
  22 static int unknown_in_range(const struct ip_conntrack_tuple *tuple,
  23                             enum ip_nat_manip_type manip_type,
  24                             const union ip_conntrack_manip_proto *min,
  25                             const union ip_conntrack_manip_proto *max)
  26 {
  27         return 1;
  28 }
  29
  30 static int unknown_unique_tuple(struct ip_conntrack_tuple *tuple,
  31                                 const struct ip_nat_range *range,
  32                                 enum ip_nat_manip_type maniptype,
  33                                 const struct ip_conntrack *conntrack)
  34 {
  35         /* Sorry: we can't help you; if it's not unique, we can't frob
  36            anything. */
  37         return 0;
  38 }
  39
  40 static int
  41 unknown_manip_pkt(struct sk_buff **pskb,
  42                   unsigned int iphdroff,
  43                   const struct ip_conntrack_tuple *tuple,
  44                   enum ip_nat_manip_type maniptype)
  45 {
  46         return 1;
  47 }
  48
  49 struct ip_nat_protocol ip_nat_unknown_protocol = {
  50         .name                   = "unknown",
  51         /* .me isn't set: getting a ref to this cannot fail. */
  52         .manip_pkt              = unknown_manip_pkt,
  53         .in_range               = unknown_in_range,
  54         .unique_tuple           = unknown_unique_tuple,
  55 };