nes-proj/core/net/rime/multihop.h

111 lines
3.8 KiB
C

/*
* Copyright (c) 2006, Swedish Institute of Computer Science.
* All rights reserved.
*
* 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 Institute 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 INSTITUTE 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 INSTITUTE OR CONTRIBUTORS 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Multihop forwarding header file
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimemultihop Best-effort multihop forwarding
* @{
*
* The multihop module implements a multihop forwarding mechanism. Routes
* must have already been setup with the route_add() function. Setting
* up routes is done with another Rime module such as the \ref
* routediscovery "route-discovery module".
*
* The multihop sends a packet to an identified node in the network by
* using multi-hop forwarding at each node in the network. The
* application or protocol that uses the multihop primitive supplies a
* routing function for selecting the next-hop neighbor. If the
* multihop primitive is requested to send a packet for which no
* suitable next hop neighbor is found, the caller is immediately
* notified of this and may choose to initiate a route discovery
* process.
*
*
* \section multihop-channels Channels
*
* The multihop module uses 1 channel.
*
*/
#ifndef MULTIHOP_H_
#define MULTIHOP_H_
#include "net/rime/unicast.h"
#include "net/linkaddr.h"
struct multihop_conn;
#define MULTIHOP_ATTRIBUTES { PACKETBUF_ADDR_ESENDER, PACKETBUF_ADDRSIZE }, \
{ PACKETBUF_ADDR_ERECEIVER, PACKETBUF_ADDRSIZE }, \
{ PACKETBUF_ATTR_HOPS, PACKETBUF_ATTR_BIT * 5 }, \
UNICAST_ATTRIBUTES
struct multihop_callbacks {
void (* recv)(struct multihop_conn *ptr,
const linkaddr_t *sender,
const linkaddr_t *prevhop,
uint8_t hops);
linkaddr_t *(* forward)(struct multihop_conn *ptr,
const linkaddr_t *originator,
const linkaddr_t *dest,
const linkaddr_t *prevhop,
uint8_t hops);
};
struct multihop_conn {
struct unicast_conn c;
const struct multihop_callbacks *cb;
};
void multihop_open(struct multihop_conn *c, uint16_t channel,
const struct multihop_callbacks *u);
void multihop_close(struct multihop_conn *c);
int multihop_send(struct multihop_conn *c, const linkaddr_t *to);
void multihop_resend(struct multihop_conn *c, const linkaddr_t *nexthop);
#endif /* MULTIHOP_H_ */
/** @} */
/** @} */