net/ipv4/netfilter/nf_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) 2002-2006 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
  16 #include <linux/netfilter.h>
  17 #include <net/netfilter/nf_nat.h>
  18 #include <net/netfilter/nf_nat_rule.h>
  19 #include <net/netfilter/nf_nat_protocol.h>
  20
  21 static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
  22                              enum nf_nat_manip_type manip_type,
  23                              const union nf_conntrack_man_proto *min,
  24                              const union nf_conntrack_man_proto *max)
  25 {
  26         return true;
  27 }
  28
  29 static bool unknown_unique_tuple(struct nf_conntrack_tuple *tuple,
  30                                  const struct nf_nat_range *range,
  31                                  enum nf_nat_manip_type maniptype,
  32                                  const struct nf_conn *ct)
  33 {
  34         /* Sorry: we can't help you; if it's not unique, we can't frob
  35            anything. */
  36         return false;
  37 }
  38
  39 static bool
  40 unknown_manip_pkt(struct sk_buff *skb,
  41                   unsigned int iphdroff,
  42                   const struct nf_conntrack_tuple *tuple,
  43                   enum nf_nat_manip_type maniptype)
  44 {
  45         return true;
  46 }
  47
  48 const struct nf_nat_protocol nf_nat_unknown_protocol = {
  49         /* .me isn't set: getting a ref to this cannot fail. */
  50         .manip_pkt              = unknown_manip_pkt,
  51         .in_range               = unknown_in_range,
  52         .unique_tuple           = unknown_unique_tuple,
  53 };