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    1: /*	$NetBSD: nattraversal.h,v 1.7 2010/09/22 07:34:51 vanhu Exp $	*/
    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)	((_ph1)->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(_ph1)	((_ph1)->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 */