/* $NetBSD: nattraversal.h,v 1.6 2006/09/09 16:22:09 manu Exp $ */
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/*
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* Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
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* Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NATTRAVERSAL_H
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#define _NATTRAVERSAL_H
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#include "vendorid.h"
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#define NAT_ANNOUNCED (1L<<0)
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#define NAT_DETECTED_ME (1L<<1)
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#define NAT_DETECTED_PEER (1L<<2)
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#define NAT_PORTS_CHANGED (1L<<3)
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#define NAT_KA_QUEUED (1L<<4)
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#define NAT_ADD_NON_ESP_MARKER (1L<<5)
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#define NATT_AVAILABLE(ph1) ((iph1)->natt_flags & NAT_ANNOUNCED)
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#define NAT_DETECTED (NAT_DETECTED_ME | NAT_DETECTED_PEER)
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#define NON_ESP_MARKER_LEN sizeof(u_int32_t)
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#define NON_ESP_MARKER_USE(iph1) ((iph1)->natt_flags & NAT_ADD_NON_ESP_MARKER)
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/* These are the values from parsing "remote {}"
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block of the config file. */
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#define NATT_OFF FLASE /* = 0 */
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#define NATT_ON TRUE /* = 1 */
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#define NATT_FORCE 2
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struct ph1natt_options {
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int version;
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u_int16_t float_port;
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u_int16_t mode_udp_tunnel;
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u_int16_t mode_udp_transport;
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u_int16_t encaps_type; /* ESPINUDP / ESPINUDP_NON_IKE */
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u_int16_t mode_udp_diff;
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u_int16_t payload_nat_d;
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u_int16_t payload_nat_oa;
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};
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struct ph2natt {
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u_int8_t type;
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u_int16_t sport;
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u_int16_t dport;
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struct sockaddr *oa;
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u_int16_t frag;
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};
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int natt_vendorid (int vid);
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vchar_t *natt_hash_addr (struct ph1handle *iph1, struct sockaddr *addr);
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int natt_compare_addr_hash (struct ph1handle *iph1, vchar_t *natd_received, int natd_seq);
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int natt_udp_encap (int encmode);
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int natt_fill_options (struct ph1natt_options *opts, int version);
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void natt_float_ports (struct ph1handle *iph1);
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void natt_handle_vendorid (struct ph1handle *iph1, int vid_numeric);
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struct payload_list *
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isakmp_plist_append_natt_vids (struct payload_list *plist, vchar_t *vid_natt[MAX_NATT_VID_COUNT]);
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/* NAT keepalive functions */
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void natt_keepalive_init (void);
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int natt_keepalive_add (struct sockaddr *src, struct sockaddr *dst);
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int natt_keepalive_add_ph1 (struct ph1handle *iph1);
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void natt_keepalive_remove (struct sockaddr *src, struct sockaddr *dst);
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/* Walk through all rmconfigs and tell if NAT-T is enabled in at least one. */
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int natt_enabled_in_rmconf (void);
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#endif /* _NATTRAVERSAL_H */
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