1 /* FreeS/WAN NAT-Traversal
2 * Copyright (C) 2002-2003 Mathieu Lafon - Arkoon Network Security
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * RCSID $Id: nat_traversal.h,v 1.3 2003-09-29 05:08:44 philipc Exp $
17 #ifndef _NAT_TRAVERSAL_H_
18 #define _NAT_TRAVERSAL_H_
20 #define NAT_TRAVERSAL_IETF_00_01 1
21 #define NAT_TRAVERSAL_IETF_02_03 2
22 #define NAT_TRAVERSAL_RFC 3
24 #define NAT_TRAVERSAL_NAT_BHND_ME 30
25 #define NAT_TRAVERSAL_NAT_BHND_PEER 31
27 #define NAT_TRAVERSAL_METHOD (0xffffffff - LELEM(30) - LELEM(31))
30 * NAT-Traversal methods which need NAT-D
32 #define NAT_T_WITH_NATD \
33 ( LELEM(NAT_TRAVERSAL_IETF_00_01) | LELEM(NAT_TRAVERSAL_IETF_02_03) | \
34 LELEM(NAT_TRAVERSAL_RFC) )
36 * NAT-Traversal methods which need NAT-OA
38 #define NAT_T_WITH_NATOA \
39 ( LELEM(NAT_TRAVERSAL_IETF_00_01) | LELEM(NAT_TRAVERSAL_IETF_02_03) | \
40 LELEM(NAT_TRAVERSAL_RFC) )
42 * NAT-Traversal methods which use NAT-KeepAlive
44 #define NAT_T_WITH_KA \
45 ( LELEM(NAT_TRAVERSAL_IETF_00_01) | LELEM(NAT_TRAVERSAL_IETF_02_03) | \
46 LELEM(NAT_TRAVERSAL_RFC) )
48 * NAT-Traversal methods which use floating port
50 #define NAT_T_WITH_PORT_FLOATING \
51 ( LELEM(NAT_TRAVERSAL_IETF_02_03) | LELEM(NAT_TRAVERSAL_RFC) )
54 * NAT-Traversal methods which use officials values (RFC)
56 #define NAT_T_WITH_RFC_VALUES \
57 ( LELEM(NAT_TRAVERSAL_RFC) )
60 * NAT-Traversal detected
62 #define NAT_T_DETECTED \
63 ( LELEM(NAT_TRAVERSAL_NAT_BHND_ME) | LELEM(NAT_TRAVERSAL_NAT_BHND_PEER) )
68 #define NAT_T_IKE_FLOAT_PORT 4500
70 void init_nat_traversal (bool activate, unsigned int keep_alive_period,
73 extern bool nat_traversal_enabled;
74 extern bool nat_traversal_support_port_floating;
79 void nat_traversal_natd_lookup(struct msg_digest *md);
80 #ifndef PB_STREAM_UNDEFINED
81 bool nat_traversal_add_natd(u_int8_t np, pb_stream *outs,
82 struct msg_digest *md);
88 void nat_traversal_natoa_lookup(struct msg_digest *md);
89 #ifndef PB_STREAM_UNDEFINED
90 bool nat_traversal_add_natoa(u_int8_t np, pb_stream *outs,
97 void nat_traversal_new_ka_event (void);
98 void nat_traversal_ka_event (void);
100 void nat_traversal_show_result (u_int32_t nt, u_int16_t sport);
102 int nat_traversal_espinudp_socket (int sk, u_int32_t type);
107 #ifndef PB_STREAM_UNDEFINED
108 bool nat_traversal_add_vid(u_int8_t np, pb_stream *outs);
110 u_int32_t nat_traversal_vid_to_method(unsigned short nat_t_vid);
112 void nat_traversal_change_port_lookup(struct msg_digest *md, struct state *st);
118 void process_pfkey_nat_t_new_mapping(
120 struct sadb_ext *[SADB_EXT_MAX + 1]);
127 nat_traversal_port_float(struct state *st, struct msg_digest *md, bool in);
130 * Encapsulation mode macro (see demux.c)
132 #define NAT_T_ENCAPSULATION_MODE(st,nat_t_policy) ( \
133 ((st)->nat_traversal & NAT_T_DETECTED) \
134 ? ( ((nat_t_policy) & POLICY_TUNNEL) \
135 ? ( ((st)->nat_traversal & NAT_T_WITH_RFC_VALUES) \
136 ? (ENCAPSULATION_MODE_UDP_TUNNEL_RFC) \
137 : (ENCAPSULATION_MODE_UDP_TUNNEL_DRAFTS) \
139 : ( ((st)->nat_traversal & NAT_T_WITH_RFC_VALUES) \
140 ? (ENCAPSULATION_MODE_UDP_TRANSPORT_RFC) \
141 : (ENCAPSULATION_MODE_UDP_TRANSPORT_DRAFTS) \
144 : ( ((st)->st_policy & POLICY_TUNNEL) \
145 ? (ENCAPSULATION_MODE_TUNNEL) \
146 : (ENCAPSULATION_MODE_TRANSPORT) \
150 #endif /* _NAT_TRAVERSAL_H_ */