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