111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* Multihop forwarding header file
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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/**
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* \addtogroup rime
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* @{
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*/
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/**
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* \defgroup rimemultihop Best-effort multihop forwarding
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* @{
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*
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* The multihop module implements a multihop forwarding mechanism. Routes
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* must have already been setup with the route_add() function. Setting
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* up routes is done with another Rime module such as the \ref
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* routediscovery "route-discovery module".
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*
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* The multihop sends a packet to an identified node in the network by
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* using multi-hop forwarding at each node in the network. The
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* application or protocol that uses the multihop primitive supplies a
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* routing function for selecting the next-hop neighbor. If the
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* multihop primitive is requested to send a packet for which no
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* suitable next hop neighbor is found, the caller is immediately
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* notified of this and may choose to initiate a route discovery
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* process.
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*
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*
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* \section multihop-channels Channels
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*
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* The multihop module uses 1 channel.
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*
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*/
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#ifndef MULTIHOP_H_
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#define MULTIHOP_H_
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#include "net/rime/unicast.h"
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#include "net/linkaddr.h"
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struct multihop_conn;
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#define MULTIHOP_ATTRIBUTES { PACKETBUF_ADDR_ESENDER, PACKETBUF_ADDRSIZE }, \
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{ PACKETBUF_ADDR_ERECEIVER, PACKETBUF_ADDRSIZE }, \
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{ PACKETBUF_ATTR_HOPS, PACKETBUF_ATTR_BIT * 5 }, \
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UNICAST_ATTRIBUTES
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struct multihop_callbacks {
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void (* recv)(struct multihop_conn *ptr,
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const linkaddr_t *sender,
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const linkaddr_t *prevhop,
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uint8_t hops);
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linkaddr_t *(* forward)(struct multihop_conn *ptr,
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const linkaddr_t *originator,
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const linkaddr_t *dest,
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const linkaddr_t *prevhop,
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uint8_t hops);
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};
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struct multihop_conn {
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struct unicast_conn c;
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const struct multihop_callbacks *cb;
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};
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void multihop_open(struct multihop_conn *c, uint16_t channel,
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const struct multihop_callbacks *u);
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void multihop_close(struct multihop_conn *c);
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int multihop_send(struct multihop_conn *c, const linkaddr_t *to);
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void multihop_resend(struct multihop_conn *c, const linkaddr_t *nexthop);
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#endif /* MULTIHOP_H_ */
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/** @} */
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/** @} */
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