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 #ifdef ENABLE_NATT
  36 #ifdef ENABLE_FRAG
  37 #include "isakmp_frag.h"
  38 #endif /* ENABLE_NATT */
  39 #endif /* ENABLE_FRAG */
  40
  41 #define UDP_ENCAP_ESPINUDP      2       /* to make it compile - we don't use this */
  42
  43 #define NAT_ANNOUNCED           (1L<<0)
  44 #define NAT_DETECTED_ME         (1L<<1)
  45 #define NAT_DETECTED_PEER       (1L<<2)
  46 #define NAT_PORTS_CHANGED       (1L<<3)
  47 #define NAT_KA_QUEUED           (1L<<4)
  48 #define NAT_ADD_NON_ESP_MARKER  (1L<<5)
  49
  50 #define NATT_AVAILABLE(iph1)    ((iph1)->natt_flags & NAT_ANNOUNCED)
  51
  52 #define NAT_DETECTED    (NAT_DETECTED_ME | NAT_DETECTED_PEER)
  53
  54 #define NON_ESP_MARKER_LEN      sizeof(u_int32_t)
  55 #define NON_ESP_MARKER_USE(iph1)        ((iph1)->natt_flags & NAT_ADD_NON_ESP_MARKER)
  56
  57 #ifdef ENABLE_NATT
  58 #ifdef ENABLE_FRAG
  59 #define PH1_NON_ESP_EXTRA_LEN(iph1, sendbuf) ((iph1->frag && sendbuf->l > ISAKMP_FRAG_MAXLEN) ? 0: (NON_ESP_MARKER_USE(iph1) ? NON_ESP_MARKER_LEN : 0))
  60 #define PH2_NON_ESP_EXTRA_LEN(iph2, sendbuf) ((iph2->ph1->frag && sendbuf->l > ISAKMP_FRAG_MAXLEN) ? 0: (NON_ESP_MARKER_USE(iph2->ph1) ? NON_ESP_MARKER_LEN : 0))
  61 #define PH1_FRAG_FLAGS(iph1) (NON_ESP_MARKER_USE(iph1) ? FRAG_PUT_NON_ESP_MARKER : 0)
  62 #define PH2_FRAG_FLAGS(iph2) (NON_ESP_MARKER_USE(iph2->ph1) ? FRAG_PUT_NON_ESP_MARKER : 0)
  63 #else
  64 #define PH1_NON_ESP_EXTRA_LEN(iph1, sendbuf) (NON_ESP_MARKER_USE(iph1) ? NON_ESP_MARKER_LEN : 0)
  65 #define PH2_NON_ESP_EXTRA_LEN(iph2, sendbuf) (NON_ESP_MARKER_USE(iph2->ph1) ? NON_ESP_MARKER_LEN : 0)
  66 #define PH1_FRAG_FLAGS(iph1) 0
  67 #define PH2_FRAG_FLAGS(iph2) 0
  68 #endif
  69 #else
  70 #define PH1_NON_ESP_EXTRA_LEN(iph1, sendbuf) 0
  71 #define PH2_NON_ESP_EXTRA_LEN(iph2, sendbuf) 0
  72 #define PH1_FRAG_FLAGS(iph1) 0
  73 #define PH2_FRAG_FLAGS(iph2) 0
  74 #endif
  75
  76 /* These are the values from parsing "remote {}"
  77    block of the config file. */
  78 #define NATT_OFF        FALSE   /* = 0 */
  79 #define NATT_ON         TRUE    /* = 1 */
  80 #define NATT_FORCE      2
  81
  82 struct ph1natt_options {
  83   int           version;
  84   u_int16_t     float_port;
  85   u_int16_t     mode_udp_tunnel;
  86   u_int16_t     mode_udp_transport;
  87   u_int16_t     encaps_type; /* ESPINUDP / ESPINUDP_NON_IKE */
  88   u_int16_t     mode_udp_diff;
  89   u_int16_t     payload_nat_d;
  90   u_int16_t     payload_nat_oa;
  91 };
  92
  93 struct ph2natt {
  94   u_int8_t      type;
  95   u_int16_t     sport;
  96   u_int16_t     dport;
  97   struct sockaddr_storage       *oa;
  98   u_int16_t     frag;
  99 };
 100
 101 int natt_vendorid (int vid);
 102 vchar_t *natt_hash_addr (phase1_handle_t *iph1, struct sockaddr_storage *addr);
 103 int natt_compare_addr_hash (phase1_handle_t *iph1, vchar_t *natd_received, int natd_seq);
 104 int natt_udp_encap (int encmode);
 105 int natt_fill_options (struct ph1natt_options *opts, int version);
 106 void natt_float_ports (phase1_handle_t *iph1);
 107 void natt_handle_vendorid (phase1_handle_t *iph1, int vid_numeric);
 108 int create_natoa_payloads(phase2_handle_t *iph2, vchar_t **, vchar_t **);
 109 struct sockaddr_storage * process_natoa_payload(vchar_t *buf);
 110
 111 struct payload_list *
 112 isakmp_plist_append_natt_vids (struct payload_list *plist, vchar_t *vid_natt[MAX_NATT_VID_COUNT]);
 113
 114 /* Walk through all rmconfigs and tell if NAT-T is enabled in at least one. */
 115 int natt_enabled_in_rmconf (void);
 116
 117 #endif /* _NATTRAVERSAL_H */