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 methodes 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) 2007-2008 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 version 3 as
24 * published by the Free Software Foundation.
26 * uAnytun is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
31 * You should have received a copy of the GNU General Public License
32 * along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
35 #ifndef _ENCRYPTED_PACKET_H_
36 #define _ENCRYPTED_PACKET_H_
38 #define ENCRYPTED_PACKET_SIZE_MAX 1600
40 #define PAYLOAD_TYPE_TAP 0x6558
41 #define PAYLOAD_TYPE_TUN 0x0000
42 #define PAYLOAD_TYPE_TUN4 0x0800
43 #define PAYLOAD_TYPE_TUN6 0x86DD
45 struct __attribute__ ((__packed__)) encrypted_packet_header_struct {
47 sender_id_t sender_id_;
50 typedef struct encrypted_packet_header_struct encrypted_packet_header_t;
52 struct encrypted_packet_struct {
53 u_int32_t payload_length_;
54 u_int32_t auth_tag_length_;
55 union __attribute__ ((__packed__)) {
56 u_int8_t buf_[ENCRYPTED_PACKET_SIZE_MAX];
57 encrypted_packet_header_t header_;
60 typedef struct encrypted_packet_struct encrypted_packet_t;
62 void encrypted_packet_init(encrypted_packet_t* packet, u_int32_t auth_tag_length);
64 u_int32_t encrypted_packet_get_minimum_length(encrypted_packet_t* packet);
66 u_int8_t* encrypted_packet_get_packet(encrypted_packet_t* packet);
67 u_int32_t encrypted_packet_get_length(encrypted_packet_t* packet);
68 void encrypted_packet_set_length(encrypted_packet_t* packet, u_int32_t len);
70 u_int8_t* encrypted_packet_get_payload(encrypted_packet_t* packet);
71 u_int32_t encrypted_packet_get_payload_length(encrypted_packet_t* packet);
72 void encrypted_packet_set_payload_length(encrypted_packet_t* packet, u_int32_t len);
74 u_int8_t* encrypted_packet_get_auth_portion(encrypted_packet_t* packet);
75 u_int32_t encrypted_packet_get_auth_portion_length(encrypted_packet_t* packet);
77 u_int8_t* encrypted_packet_get_auth_tag(encrypted_packet_t* packet);
78 u_int32_t encrypted_packet_get_auth_tag_length(encrypted_packet_t* packet);
80 seq_nr_t encrypted_packet_get_seq_nr(encrypted_packet_t* packet);
81 void encrypted_packet_set_seq_nr(encrypted_packet_t* packet, seq_nr_t seq_nr);
83 sender_id_t encrypted_packet_get_sender_id(encrypted_packet_t* packet);
84 void encrypted_packet_set_sender_id(encrypted_packet_t* packet, sender_id_t sender_id);
86 mux_t encrypted_packet_get_mux(encrypted_packet_t* packet);
87 void encrypted_packet_set_mux(encrypted_packet_t* packet, mux_t mux);