mirror of https://github.com/LeOS-GSI/LeOS-Genesis
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
/**
|
|
* @file dataproto.h
|
|
* @author Ambroz Bizjak <ambrop7@gmail.com>
|
|
*
|
|
* @section LICENSE
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the author nor the
|
|
* names of its contributors may be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
|
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
|
|
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
|
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* @section DESCRIPTION
|
|
*
|
|
* Definitions for DataProto, the protocol for data transport between VPN peers.
|
|
*
|
|
* All multi-byte integers in structs are little-endian, unless stated otherwise.
|
|
*
|
|
* A DataProto packet consists of:
|
|
* - the header (struct {@link dataproto_header})
|
|
* - between zero and DATAPROTO_MAX_PEER_IDS destination peer IDs (struct {@link dataproto_peer_id})
|
|
* - the payload, e.g. Ethernet frame
|
|
*/
|
|
|
|
#ifndef BADVPN_PROTOCOL_DATAPROTO_H
|
|
#define BADVPN_PROTOCOL_DATAPROTO_H
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <protocol/scproto.h>
|
|
#include <misc/packed.h>
|
|
|
|
#define DATAPROTO_MAX_PEER_IDS 1
|
|
|
|
#define DATAPROTO_FLAGS_RECEIVING_KEEPALIVES 1
|
|
|
|
/**
|
|
* DataProto header.
|
|
*/
|
|
B_START_PACKED
|
|
struct dataproto_header {
|
|
/**
|
|
* Bitwise OR of flags. Possible flags:
|
|
* - DATAPROTO_FLAGS_RECEIVING_KEEPALIVES
|
|
* Indicates that when the peer sent this packet, it has received at least
|
|
* one packet from the other peer in the last keep-alive tolerance time.
|
|
*/
|
|
uint8_t flags;
|
|
|
|
/**
|
|
* ID of the peer this frame originates from.
|
|
*/
|
|
peerid_t from_id;
|
|
|
|
/**
|
|
* Number of destination peer IDs that follow.
|
|
* Must be <=DATAPROTO_MAX_PEER_IDS.
|
|
*/
|
|
peerid_t num_peer_ids;
|
|
} B_PACKED;
|
|
B_END_PACKED
|
|
|
|
/**
|
|
* Structure for a destination peer ID in DataProto.
|
|
* Wraps a single peerid_t in a packed struct for easy access.
|
|
*/
|
|
B_START_PACKED
|
|
struct dataproto_peer_id {
|
|
peerid_t id;
|
|
} B_PACKED;
|
|
B_END_PACKED
|
|
|
|
#define DATAPROTO_MAX_OVERHEAD (sizeof(struct dataproto_header) + DATAPROTO_MAX_PEER_IDS * sizeof(struct dataproto_peer_id))
|
|
|
|
#endif
|