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/* $NetBSD: nattraversal.h,v 1.7 2010/09/22 07:34:51 vanhu Exp $ */
/*
* Copyright (C) 2004 SuSE Linux AG, Nuernberg, Germany.
* Contributed by: Michal Ludvig <mludvig@suse.cz>, SUSE Labs
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _NATTRAVERSAL_H
#define _NATTRAVERSAL_H
#include "vendorid.h"
#define NAT_ANNOUNCED (1L<<0)
#define NAT_DETECTED_ME (1L<<1)
#define NAT_DETECTED_PEER (1L<<2)
#define NAT_PORTS_CHANGED (1L<<3)
#define NAT_KA_QUEUED (1L<<4)
#define NAT_ADD_NON_ESP_MARKER (1L<<5)
#define NATT_AVAILABLE(_ph1) ((_ph1)->natt_flags & NAT_ANNOUNCED)
#define NAT_DETECTED (NAT_DETECTED_ME | NAT_DETECTED_PEER)
#define NON_ESP_MARKER_LEN sizeof(u_int32_t)
#define NON_ESP_MARKER_USE(_ph1) ((_ph1)->natt_flags & NAT_ADD_NON_ESP_MARKER)
/* These are the values from parsing "remote {}"
block of the config file. */
#define NATT_OFF FLASE /* = 0 */
#define NATT_ON TRUE /* = 1 */
#define NATT_FORCE 2
struct ph1natt_options {
int version;
u_int16_t float_port;
u_int16_t mode_udp_tunnel;
u_int16_t mode_udp_transport;
u_int16_t encaps_type; /* ESPINUDP / ESPINUDP_NON_IKE */
u_int16_t mode_udp_diff;
u_int16_t payload_nat_d;
u_int16_t payload_nat_oa;
};
struct ph2natt {
u_int8_t type;
u_int16_t sport;
u_int16_t dport;
struct sockaddr *oa;
u_int16_t frag;
};
int natt_vendorid (int vid);
vchar_t *natt_hash_addr (struct ph1handle *iph1, struct sockaddr *addr);
int natt_compare_addr_hash (struct ph1handle *iph1, vchar_t *natd_received, int natd_seq);
int natt_udp_encap (int encmode);
int natt_fill_options (struct ph1natt_options *opts, int version);
void natt_float_ports (struct ph1handle *iph1);
void natt_handle_vendorid (struct ph1handle *iph1, int vid_numeric);
struct payload_list *
isakmp_plist_append_natt_vids (struct payload_list *plist, vchar_t *vid_natt[MAX_NATT_VID_COUNT]);
/* NAT keepalive functions */
void natt_keepalive_init (void);
int natt_keepalive_add (struct sockaddr *src, struct sockaddr *dst);
int natt_keepalive_add_ph1 (struct ph1handle *iph1);
void natt_keepalive_remove (struct sockaddr *src, struct sockaddr *dst);
/* Walk through all rmconfigs and tell if NAT-T is enabled in at least one. */
int natt_enabled_in_rmconf (void);
#endif /* _NATTRAVERSAL_H */
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