4 * uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
5 * featured implementation uAnytun has no support for multiple connections
6 * or synchronisation. It is a small single threaded implementation intended
7 * to act as a client on small platforms.
8 * The secure anycast tunneling protocol (satp) defines a protocol used
9 * for communication between any combination of unicast and anycast
10 * tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
11 * mode and allows tunneling of every ETHER TYPE protocol (e.g.
12 * ethernet, ip, arp ...). satp directly includes cryptography and
13 * message authentication based on the methods used by SRTP. It is
14 * intended to deliver a generic, scaleable and secure solution for
15 * tunneling and relaying of packets of any protocol.
18 * Copyright (C) 2007-2014 Christian Pointner <equinox@anytun.org>
20 * This file is part of uAnytun.
22 * uAnytun is free software: you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation, either version 3 of the License, or
27 * uAnytun is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
35 * In addition, as a special exception, the copyright holders give
36 * permission to link the code of portions of this program with the
37 * OpenSSL library under certain conditions as described in each
38 * individual source file, and distribute linked combinations
40 * You must obey the GNU General Public License in all respects
41 * for all of the code used other than OpenSSL. If you modify
42 * file(s) with this exception, you may extend this exception to your
43 * version of the file(s), but you are not obligated to do so. If you
44 * do not wish to do so, delete this exception statement from your
45 * version. If you delete this exception statement from all source
46 * files in the program, then also delete it here.
49 #ifndef UANYTUN_encrypted_packet_h_INCLUDED
50 #define UANYTUN_encrypted_packet_h_INCLUDED
52 #define ENCRYPTED_PACKET_SIZE_MAX 1600
54 #define PAYLOAD_TYPE_TAP 0x6558
55 #define PAYLOAD_TYPE_TUN 0x0000
56 #define PAYLOAD_TYPE_TUN4 0x0800
57 #define PAYLOAD_TYPE_TUN6 0x86DD
59 struct __attribute__ ((__packed__)) encrypted_packet_header_struct {
61 sender_id_t sender_id_;
64 typedef struct encrypted_packet_header_struct encrypted_packet_header_t;
66 struct encrypted_packet_struct {
67 u_int32_t payload_length_;
68 u_int32_t auth_tag_length_;
69 union __attribute__ ((__packed__)) {
70 u_int8_t buf_[ENCRYPTED_PACKET_SIZE_MAX];
71 encrypted_packet_header_t header_;
74 typedef struct encrypted_packet_struct encrypted_packet_t;
76 void encrypted_packet_init(encrypted_packet_t* packet, u_int32_t auth_tag_length);
78 u_int32_t encrypted_packet_get_minimum_length(encrypted_packet_t* packet);
80 u_int8_t* encrypted_packet_get_packet(encrypted_packet_t* packet);
81 u_int32_t encrypted_packet_get_length(encrypted_packet_t* packet);
82 void encrypted_packet_set_length(encrypted_packet_t* packet, u_int32_t len);
84 u_int8_t* encrypted_packet_get_payload(encrypted_packet_t* packet);
85 u_int32_t encrypted_packet_get_payload_length(encrypted_packet_t* packet);
86 void encrypted_packet_set_payload_length(encrypted_packet_t* packet, u_int32_t len);
88 u_int8_t* encrypted_packet_get_auth_portion(encrypted_packet_t* packet);
89 u_int32_t encrypted_packet_get_auth_portion_length(encrypted_packet_t* packet);
91 u_int8_t* encrypted_packet_get_auth_tag(encrypted_packet_t* packet);
92 u_int32_t encrypted_packet_get_auth_tag_length(encrypted_packet_t* packet);
94 seq_nr_t encrypted_packet_get_seq_nr(encrypted_packet_t* packet);
95 void encrypted_packet_set_seq_nr(encrypted_packet_t* packet, seq_nr_t seq_nr);
97 sender_id_t encrypted_packet_get_sender_id(encrypted_packet_t* packet);
98 void encrypted_packet_set_sender_id(encrypted_packet_t* packet, sender_id_t sender_id);
100 mux_t encrypted_packet_get_mux(encrypted_packet_t* packet);
101 void encrypted_packet_set_mux(encrypted_packet_t* packet, mux_t mux);