ipsec-tools/racoon/nattraversal.h

   1 /*
   2  * Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
   3  * Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the project nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #ifndef _NATTRAVERSAL_H
  32 #define _NATTRAVERSAL_H
  33
  34 #include "vendorid.h"
  35
  36 #ifdef __APPLE__
  37 #define UDP_ENCAP_ESPINUDP      2       /* to make it compile - we don't use this */
  38 #endif
  39
  40 #define NAT_ANNOUNCED           (1L<<0)
  41 #define NAT_DETECTED_ME         (1L<<1)
  42 #define NAT_DETECTED_PEER       (1L<<2)
  43 #define NAT_PORTS_CHANGED       (1L<<3)
  44 #define NAT_KA_QUEUED           (1L<<4)
  45 #define NAT_ADD_NON_ESP_MARKER  (1L<<5)
  46
  47 #define NATT_AVAILABLE(ph1)     ((iph1)->natt_flags & NAT_ANNOUNCED)
  48
  49 #define NAT_DETECTED    (NAT_DETECTED_ME | NAT_DETECTED_PEER)
  50
  51 #define NON_ESP_MARKER_LEN      sizeof(u_int32_t)
  52 #define NON_ESP_MARKER_USE(iph1)        ((iph1)->natt_flags & NAT_ADD_NON_ESP_MARKER)
  53
  54 #ifdef ENABLE_NATT
  55 #ifdef ENABLE_FRAG
  56 #define PH1_NON_ESP_EXTRA_LEN(iph1) ((iph1->frag && iph1->sendbuf->l > ISAKMP_FRAG_MAXLEN) ? 0: (NON_ESP_MARKER_USE(iph1) ? NON_ESP_MARKER_LEN : 0))
  57 #define PH2_NON_ESP_EXTRA_LEN(iph2) ((iph2->ph1->frag && iph2->sendbuf->l > ISAKMP_FRAG_MAXLEN) ? 0: (NON_ESP_MARKER_USE(iph2->ph1) ? NON_ESP_MARKER_LEN : 0))
  58 #else
  59 #define PH1_NON_ESP_EXTRA_LEN(iph1) (NON_ESP_MARKER_USE(iph1) ? NON_ESP_MARKER_LEN : 0)
  60 #define PH2_NON_ESP_EXTRA_LEN(iph2) (NON_ESP_MARKER_USE(iph2->ph1) ? NON_ESP_MARKER_LEN : 0)
  61 #endif
  62 #else
  63 #define PH1_NON_ESP_EXTRA_LEN(iph1) 0
  64 #define PH2_NON_ESP_EXTRA_LEN(iph2) 0
  65 #endif
  66
  67 /* These are the values from parsing "remote {}"
  68    block of the config file. */
  69 #define NATT_OFF        FALSE   /* = 0 */
  70 #define NATT_ON         TRUE    /* = 1 */
  71 #define NATT_FORCE      2
  72
  73 struct ph1natt_options {
  74   int           version;
  75   u_int16_t     float_port;
  76   u_int16_t     mode_udp_tunnel;
  77   u_int16_t     mode_udp_transport;
  78   u_int16_t     encaps_type; /* ESPINUDP / ESPINUDP_NON_IKE */
  79   u_int16_t     mode_udp_diff;
  80   u_int16_t     payload_nat_d;
  81   u_int16_t     payload_nat_oa;
  82 };
  83
  84 struct ph2natt {
  85   u_int8_t      type;
  86   u_int16_t     sport;
  87   u_int16_t     dport;
  88   struct sockaddr       *oa;
  89   u_int16_t     frag;
  90 };
  91
  92 int natt_vendorid (int vid);
  93 vchar_t *natt_hash_addr (struct ph1handle *iph1, struct sockaddr *addr);
  94 int natt_compare_addr_hash (struct ph1handle *iph1, vchar_t *natd_received, int natd_seq);
  95 int natt_udp_encap (int encmode);
  96 int natt_fill_options (struct ph1natt_options *opts, int version);
  97 void natt_float_ports (struct ph1handle *iph1);
  98 void natt_handle_vendorid (struct ph1handle *iph1, int vid_numeric);
  99 int create_natoa_payloads(struct ph2handle *iph2, vchar_t **, vchar_t **);
 100 struct sockaddr * process_natoa_payload(vchar_t *buf);
 101
 102 struct payload_list *
 103 isakmp_plist_append_natt_vids (struct payload_list *plist, vchar_t *vid_natt[MAX_NATT_VID_COUNT]);
 104
 105 #ifndef __APPLE__
 106 /* NAT keepalive functions */
 107 void natt_keepalive_init (void);
 108 int natt_keepalive_add (struct sockaddr *src, struct sockaddr *dst);
 109 int natt_keepalive_add_ph1 (struct ph1handle *iph1);
 110 void natt_keepalive_remove (struct sockaddr *src, struct sockaddr *dst);
 111 #endif
 112
 113 /* Walk through all rmconfigs and tell if NAT-T is enabled in at least one. */
 114 int natt_enabled_in_rmconf (void);
 115
 116 #endif /* _NATTRAVERSAL_H */