crypto/dist/ipsec-tools/src/racoon/nattraversal.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
   5  * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef _NATTRAVERSAL_H
  34 #define _NATTRAVERSAL_H
  35
  36 #include "vendorid.h"
  37
  38 #define NAT_ANNOUNCED           (1L<<0)
  39 #define NAT_DETECTED_ME         (1L<<1)
  40 #define NAT_DETECTED_PEER       (1L<<2)
  41 #define NAT_PORTS_CHANGED       (1L<<3)
  42 #define NAT_KA_QUEUED           (1L<<4)
  43 #define NAT_ADD_NON_ESP_MARKER  (1L<<5)
  44
  45 #define NATT_AVAILABLE(ph1)     ((iph1)->natt_flags & NAT_ANNOUNCED)
  46
  47 #define NAT_DETECTED    (NAT_DETECTED_ME | NAT_DETECTED_PEER)
  48
  49 #define NON_ESP_MARKER_LEN      sizeof(u_int32_t)
  50 #define NON_ESP_MARKER_USE(iph1)        ((iph1)->natt_flags & NAT_ADD_NON_ESP_MARKER)
  51
  52 /* These are the values from parsing "remote {}"
  53    block of the config file. */
  54 #define NATT_OFF        FLASE   /* = 0 */
  55 #define NATT_ON         TRUE    /* = 1 */
  56 #define NATT_FORCE      2
  57
  58 struct ph1natt_options {
  59   int           version;
  60   u_int16_t     float_port;
  61   u_int16_t     mode_udp_tunnel;
  62   u_int16_t     mode_udp_transport;
  63   u_int16_t     encaps_type; /* ESPINUDP / ESPINUDP_NON_IKE */
  64   u_int16_t     mode_udp_diff;
  65   u_int16_t     payload_nat_d;
  66   u_int16_t     payload_nat_oa;
  67 };
  68
  69 struct ph2natt {
  70   u_int8_t      type;
  71   u_int16_t     sport;
  72   u_int16_t     dport;
  73   struct sockaddr       *oa;
  74   u_int16_t     frag;
  75 };
  76
  77 int natt_vendorid (int vid);
  78 vchar_t *natt_hash_addr (struct ph1handle *iph1, struct sockaddr *addr);
  79 int natt_compare_addr_hash (struct ph1handle *iph1, vchar_t *natd_received, int natd_seq);
  80 int natt_udp_encap (int encmode);
  81 int natt_fill_options (struct ph1natt_options *opts, int version);
  82 void natt_float_ports (struct ph1handle *iph1);
  83 void natt_handle_vendorid (struct ph1handle *iph1, int vid_numeric);
  84
  85
  86 struct payload_list *
  87 isakmp_plist_append_natt_vids (struct payload_list *plist, vchar_t *vid_natt[MAX_NATT_VID_COUNT]);
  88
  89
  90 /* NAT keepalive functions */
  91 void natt_keepalive_init (void);
  92 int natt_keepalive_add (struct sockaddr *src, struct sockaddr *dst);
  93 int natt_keepalive_add_ph1 (struct ph1handle *iph1);
  94 void natt_keepalive_remove (struct sockaddr *src, struct sockaddr *dst);
  95
  96 /* Walk through all rmconfigs and tell if NAT-T is enabled in at least one. */
  97 int natt_enabled_in_rmconf (void);
  98
  99 #endif /* _NATTRAVERSAL_H */