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/* FreeS/WAN NAT-Traversal
* Copyright (C) 2002-2003 Mathieu Lafon - Arkoon Network Security
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* RCSID $Id: nat_traversal.h 3252 2007-10-06 21:24:50Z andreas $
*/
#ifndef _NAT_TRAVERSAL_H
#define _NAT_TRAVERSAL_H
#include "packet.h"
#define NAT_TRAVERSAL_IETF_00_01 1
#define NAT_TRAVERSAL_IETF_02_03 2
#define NAT_TRAVERSAL_RFC 3
#define NAT_TRAVERSAL_NAT_BHND_ME 30
#define NAT_TRAVERSAL_NAT_BHND_PEER 31
#define NAT_TRAVERSAL_METHOD (0xffffffff - LELEM(30) - LELEM(31))
/**
* NAT-Traversal methods which need NAT-D
*/
#define NAT_T_WITH_NATD \
( LELEM(NAT_TRAVERSAL_IETF_00_01) | LELEM(NAT_TRAVERSAL_IETF_02_03) | \
LELEM(NAT_TRAVERSAL_RFC) )
/**
* NAT-Traversal methods which need NAT-OA
*/
#define NAT_T_WITH_NATOA \
( LELEM(NAT_TRAVERSAL_IETF_00_01) | LELEM(NAT_TRAVERSAL_IETF_02_03) | \
LELEM(NAT_TRAVERSAL_RFC) )
/**
* NAT-Traversal methods which use NAT-KeepAlive
*/
#define NAT_T_WITH_KA \
( LELEM(NAT_TRAVERSAL_IETF_00_01) | LELEM(NAT_TRAVERSAL_IETF_02_03) | \
LELEM(NAT_TRAVERSAL_RFC) )
/**
* NAT-Traversal methods which use floating port
*/
#define NAT_T_WITH_PORT_FLOATING \
( LELEM(NAT_TRAVERSAL_IETF_02_03) | LELEM(NAT_TRAVERSAL_RFC) )
/**
* NAT-Traversal methods which use officials values (RFC)
*/
#define NAT_T_WITH_RFC_VALUES \
( LELEM(NAT_TRAVERSAL_RFC) )
/**
* NAT-Traversal detected
*/
#define NAT_T_DETECTED \
( LELEM(NAT_TRAVERSAL_NAT_BHND_ME) | LELEM(NAT_TRAVERSAL_NAT_BHND_PEER) )
/**
* NAT-T Port Floating
*/
#define NAT_T_IKE_FLOAT_PORT 4500
void init_nat_traversal (bool activate, unsigned int keep_alive_period,
bool fka, bool spf);
extern bool nat_traversal_enabled;
extern bool nat_traversal_support_non_ike;
extern bool nat_traversal_support_port_floating;
/**
* NAT-D
*/
void nat_traversal_natd_lookup(struct msg_digest *md);
#ifndef PB_STREAM_UNDEFINED
bool nat_traversal_add_natd(u_int8_t np, pb_stream *outs,
struct msg_digest *md);
#endif
/**
* NAT-OA
*/
void nat_traversal_natoa_lookup(struct msg_digest *md);
#ifndef PB_STREAM_UNDEFINED
bool nat_traversal_add_natoa(u_int8_t np, pb_stream *outs,
struct state *st);
#endif
/**
* NAT-keep_alive
*/
void nat_traversal_new_ka_event (void);
void nat_traversal_ka_event (void);
void nat_traversal_show_result (u_int32_t nt, u_int16_t sport);
int nat_traversal_espinudp_socket (int sk, u_int32_t type);
/**
* Vendor ID
*/
#ifndef PB_STREAM_UNDEFINED
bool nat_traversal_add_vid(u_int8_t np, pb_stream *outs);
#endif
u_int32_t nat_traversal_vid_to_method(unsigned short nat_t_vid);
void nat_traversal_change_port_lookup(struct msg_digest *md, struct state *st);
/**
* New NAT mapping
*/
#ifdef __PFKEY_V2_H
void process_pfkey_nat_t_new_mapping(
struct sadb_msg *,
struct sadb_ext *[SADB_EXT_MAX + 1]);
#endif
/**
* IKE port floating
*/
bool
nat_traversal_port_float(struct state *st, struct msg_digest *md, bool in);
/**
* Encapsulation mode macro (see demux.c)
*/
#define NAT_T_ENCAPSULATION_MODE(st,nat_t_policy) ( \
((st)->nat_traversal & NAT_T_DETECTED) \
? ( ((nat_t_policy) & POLICY_TUNNEL) \
? ( ((st)->nat_traversal & NAT_T_WITH_RFC_VALUES) \
? (ENCAPSULATION_MODE_UDP_TUNNEL_RFC) \
: (ENCAPSULATION_MODE_UDP_TUNNEL_DRAFTS) \
) \
: ( ((st)->nat_traversal & NAT_T_WITH_RFC_VALUES) \
? (ENCAPSULATION_MODE_UDP_TRANSPORT_RFC) \
: (ENCAPSULATION_MODE_UDP_TRANSPORT_DRAFTS) \
) \
) \
: ( ((st)->st_policy & POLICY_TUNNEL) \
? (ENCAPSULATION_MODE_TUNNEL) \
: (ENCAPSULATION_MODE_TRANSPORT) \
) \
)
#endif /* _NAT_TRAVERSAL_H */
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