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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methods used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2017 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun 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 3 of the License, or
* any later version.
*
* uAnytun 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.
*
* You should have received a copy of the GNU General Public License
* along with uAnytun. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#ifndef UANYTUN_encrypted_packet_h_INCLUDED
#define UANYTUN_encrypted_packet_h_INCLUDED
#define ENCRYPTED_PACKET_SIZE_MAX 1600
#define PAYLOAD_TYPE_TAP 0x6558
#define PAYLOAD_TYPE_TUN 0x0000
#define PAYLOAD_TYPE_TUN4 0x0800
#define PAYLOAD_TYPE_TUN6 0x86DD
struct __attribute__ ((__packed__)) encrypted_packet_header_struct {
seq_nr_t seq_nr_;
sender_id_t sender_id_;
mux_t mux_;
};
typedef struct encrypted_packet_header_struct encrypted_packet_header_t;
struct encrypted_packet_struct {
u_int32_t payload_length_;
u_int32_t auth_tag_length_;
union __attribute__ ((__packed__)) {
u_int8_t buf_[ENCRYPTED_PACKET_SIZE_MAX];
encrypted_packet_header_t header_;
} data_;
};
typedef struct encrypted_packet_struct encrypted_packet_t;
void encrypted_packet_init(encrypted_packet_t* packet, u_int32_t auth_tag_length);
u_int32_t encrypted_packet_get_minimum_length(encrypted_packet_t* packet);
u_int8_t* encrypted_packet_get_packet(encrypted_packet_t* packet);
u_int32_t encrypted_packet_get_length(encrypted_packet_t* packet);
void encrypted_packet_set_length(encrypted_packet_t* packet, u_int32_t len);
u_int8_t* encrypted_packet_get_payload(encrypted_packet_t* packet);
u_int32_t encrypted_packet_get_payload_length(encrypted_packet_t* packet);
void encrypted_packet_set_payload_length(encrypted_packet_t* packet, u_int32_t len);
u_int8_t* encrypted_packet_get_auth_portion(encrypted_packet_t* packet);
u_int32_t encrypted_packet_get_auth_portion_length(encrypted_packet_t* packet);
u_int8_t* encrypted_packet_get_auth_tag(encrypted_packet_t* packet);
u_int32_t encrypted_packet_get_auth_tag_length(encrypted_packet_t* packet);
seq_nr_t encrypted_packet_get_seq_nr(encrypted_packet_t* packet);
void encrypted_packet_set_seq_nr(encrypted_packet_t* packet, seq_nr_t seq_nr);
sender_id_t encrypted_packet_get_sender_id(encrypted_packet_t* packet);
void encrypted_packet_set_sender_id(encrypted_packet_t* packet, sender_id_t sender_id);
mux_t encrypted_packet_get_mux(encrypted_packet_t* packet);
void encrypted_packet_set_mux(encrypted_packet_t* packet, mux_t mux);
#endif
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