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

114 lines
4.2 KiB
C

/**
* \addtogroup rime
* @{
*/
/**
* \defgroup rimenetflood Best-effort network flooding
* @{
*
* The netflood module does best-effort flooding.
*
* The netflood primitive sends a single packet to all nodes in the
* network. The netflood primitive uses polite broadcasts at every hop
* to reduce the number of redundant transmissions. The netflood
* primitive does not perform retransmissions of flooded packets and
* packets are not tagged with version numbers. Instead, the netflood
* primitive sets the end-to-end sender and end-to-end packet ID
* attributes on the packets it sends. A forwarding node saves the
* end-to-end sender and packet ID of the last packet it forwards and
* does not forward a packet if it has the same end-to-end sender and
* packet ID as the last packet. This reduces the risk of routing
* loops, but does not eliminate them entirely as the netflood
* primitive saves the attributes of the latest packet seen only.
* Therefore, the netflood primitive also uses the time to live
* attribute, which is decreased by one before forwarding a packet.
* If the time to live reaches zero, the primitive does not forward
* the packet.
*
* \section channels Channels
*
* The netflood module uses 1 channel.
*
*/
/*
* 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.
*
* $Id: netflood.h,v 1.5 2009/11/08 19:40:17 adamdunkels Exp $
*/
/**
* \file
* Header file for the best-effort network flooding (netflood)
* \author
* Adam Dunkels <adam@sics.se>
*/
#ifndef __NETFLOOD_H__
#define __NETFLOOD_H__
#include "net/rime/ctimer.h"
#include "net/rime/queuebuf.h"
#include "net/rime/ipolite.h"
struct netflood_conn;
#define NETFLOOD_ATTRIBUTES { PACKETBUF_ADDR_ESENDER, PACKETBUF_ADDRSIZE }, \
{ PACKETBUF_ATTR_HOPS, PACKETBUF_ATTR_BIT * 5 }, \
{ PACKETBUF_ATTR_EPACKET_ID, PACKETBUF_ATTR_BIT * 4 }, \
IPOLITE_ATTRIBUTES
struct netflood_callbacks {
int (* recv)(struct netflood_conn *c, const rimeaddr_t *from,
const rimeaddr_t *originator, uint8_t seqno, uint8_t hops);
void (* sent)(struct netflood_conn *c);
void (* dropped)(struct netflood_conn *c);
};
struct netflood_conn {
struct ipolite_conn c;
const struct netflood_callbacks *u;
clock_time_t queue_time;
rimeaddr_t last_originator;
uint8_t last_originator_seqno;
};
void netflood_open(struct netflood_conn *c, clock_time_t queue_time,
uint16_t channel, const struct netflood_callbacks *u);
void netflood_close(struct netflood_conn *c);
int netflood_send(struct netflood_conn *c, uint8_t seqno);
#endif /* __SIBC_H__ */
/** @} */
/** @} */