298 lines
9 KiB
C
298 lines
9 KiB
C
/**
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* \addtogroup rudolph1
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* @{
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*/
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/*
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* Copyright (c) 2007, 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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* $Id: rudolph1.c,v 1.8 2007/04/02 19:12:37 adamdunkels Exp $
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*/
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/**
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* \file
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* Rudolph1: a simple block data flooding protocol
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include <stdio.h>
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#include <stddef.h> /* for offsetof */
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#include "net/rime.h"
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#include "net/rime/rudolph1.h"
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#include "cfs/cfs.h"
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#define DEFAULT_SEND_INTERVAL CLOCK_SECOND * 2
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#define TRICKLE_INTERVAL TRICKLE_SECOND / 2
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#define NACK_TIMEOUT CLOCK_SECOND / 4
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struct rudolph1_hdr {
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u8_t type;
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u8_t version;
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u16_t chunk;
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};
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#define RUDOLPH1_DATASIZE 64
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struct rudolph1_datapacket {
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struct rudolph1_hdr h;
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u8_t datalen;
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u8_t data[RUDOLPH1_DATASIZE];
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};
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enum {
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TYPE_DATA,
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TYPE_NACK,
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};
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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#define LT(a, b) ((signed char)((a) - (b)) < 0)
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/*---------------------------------------------------------------------------*/
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static int
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read_data(struct rudolph1_conn *c, char *dataptr, int chunk)
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{
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int len = 0;
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if(c->cb->read_chunk) {
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len = c->cb->read_chunk(c, chunk * RUDOLPH1_DATASIZE,
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dataptr, RUDOLPH1_DATASIZE);
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}
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static int
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format_data(struct rudolph1_conn *c, int chunk)
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{
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struct rudolph1_datapacket *p;
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rimebuf_clear();
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p = rimebuf_dataptr();
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p->h.type = TYPE_DATA;
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p->h.version = c->version;
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p->h.chunk = chunk;
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p->datalen = read_data(c, p->data, chunk);
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rimebuf_set_datalen(sizeof(struct rudolph1_datapacket) -
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(RUDOLPH1_DATASIZE - p->datalen));
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return p->datalen;
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}
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/*---------------------------------------------------------------------------*/
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static void
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write_data(struct rudolph1_conn *c, int chunk, u8_t *data, int datalen)
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{
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if(chunk == 0) {
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c->cb->write_chunk(c, 0, RUDOLPH1_FLAG_NEWFILE, data, 0);
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}
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if(datalen < RUDOLPH1_DATASIZE) {
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PRINTF("%d: get %d bytes, file complete\n",
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rimeaddr_node_addr.u16, datalen);
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c->cb->write_chunk(c, chunk * RUDOLPH1_DATASIZE,
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RUDOLPH1_FLAG_LASTCHUNK, data, datalen);
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} else {
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c->cb->write_chunk(c, chunk * RUDOLPH1_DATASIZE,
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RUDOLPH1_FLAG_NONE, data, datalen);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_nack(struct rudolph1_conn *c)
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{
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struct rudolph1_hdr *hdr;
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rimebuf_clear();
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rimebuf_hdralloc(sizeof(struct rudolph1_hdr));
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hdr = rimebuf_hdrptr();
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hdr->type = TYPE_NACK;
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hdr->version = c->version;
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hdr->chunk = c->chunk;
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PRINTF("Sending nack for %d:%d\n", hdr->version, hdr->chunk);
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uabc_send(&c->uabc, CLOCK_SECOND / 4);
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}
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/*---------------------------------------------------------------------------*/
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static void
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handle_data(struct rudolph1_conn *c, struct rudolph1_datapacket *p)
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{
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if(LT(c->version, p->h.version)) {
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PRINTF("%d.%d: rudolph1 new version %d, chunk %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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p->h.version, p->h.chunk);
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c->version = p->h.version;
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c->highest_chunk_heard = c->chunk = 0;
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if(p->h.chunk != 0) {
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send_nack(c);
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} else {
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write_data(c, 0, p->data, p->datalen);
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c->chunk = 1; /* Next chunk is 1. */
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}
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/* }*/
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} else if(p->h.version == c->version) {
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if(p->h.chunk == c->chunk) {
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PRINTF("%d.%d: received chunk %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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p->h.chunk);
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write_data(c, p->h.chunk, p->data, p->datalen);
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c->highest_chunk_heard = c->chunk;
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c->chunk++;
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} else if(p->h.chunk > c->chunk) {
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PRINTF("%d: received chunk %d > %d, sending NACK\n",
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rimeaddr_node_addr.u16,
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p->h.chunk, c->chunk);
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send_nack(c);
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c->highest_chunk_heard = p->h.chunk;
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} else if(p->h.chunk < c->chunk) {
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/* Ignore packets with a lower chunk number */
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}
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/* If we have heard a higher chunk number, we send a NACK so that
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we get a repair for the next packet. */
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if(c->highest_chunk_heard < p->h.chunk) {
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send_nack(c);
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}
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} else { /* p->h.version < c->current.h.version */
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/* Ignore packets with old version */
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv_trickle(struct trickle_conn *trickle)
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{
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struct rudolph1_conn *c = (struct rudolph1_conn *)trickle;
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struct rudolph1_datapacket *p = rimebuf_dataptr();
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if(p->h.type == TYPE_DATA) {
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PRINTF("%d.%d: received trickle with chunk %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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p->h.chunk);
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handle_data(c, p);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv_uabc(struct uabc_conn *uabc)
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{
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struct rudolph1_conn *c = (struct rudolph1_conn *)
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((char *)uabc - offsetof(struct rudolph1_conn, uabc));
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struct rudolph1_datapacket *p = rimebuf_dataptr();
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c->nacks++;
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if(p->h.type == TYPE_NACK) {
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PRINTF("Got NACK for %d:%d\n", p->h.version, p->h.chunk);
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if(p->h.version == c->version) {
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if(p->h.chunk < c->chunk) {
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/* Format and send a repair packet */
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PRINTF("%d.%d: sending repair for chunk %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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p->h.chunk);
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format_data(c, p->h.chunk);
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uabc_send(&c->uabc, c->send_interval / 2);
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}
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} else if(LT(p->h.version, c->version)) {
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format_data(c, 0);
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uabc_send(&c->uabc, c->send_interval / 2);
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}
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} else if(p->h.type == TYPE_DATA) {
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/* This is a repair packet from someone else. */
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handle_data(c, p);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_next_packet(void *ptr)
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{
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struct rudolph1_conn *c = ptr;
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int len;
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if(c->nacks == 0) {
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len = format_data(c, c->chunk);
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trickle_send(&c->trickle, c->trickle_interval);
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if(len == RUDOLPH1_DATASIZE) {
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ctimer_set(&c->t, c->send_interval, send_next_packet, c);
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}
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c->chunk++;
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} else {
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ctimer_set(&c->t, c->send_interval, send_next_packet, c);
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}
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c->nacks = 0;
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}
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/*---------------------------------------------------------------------------*/
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static const struct uabc_callbacks uabc = { recv_uabc, NULL, NULL };
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static const struct trickle_callbacks trickle = { recv_trickle };
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/*---------------------------------------------------------------------------*/
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void
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rudolph1_open(struct rudolph1_conn *c, u16_t channel,
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const struct rudolph1_callbacks *cb)
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{
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trickle_open(&c->trickle, channel, &trickle);
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uabc_open(&c->uabc, channel + 1, &uabc);
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c->cb = cb;
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c->version = 0;
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c->send_interval = DEFAULT_SEND_INTERVAL;
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph1_close(struct rudolph1_conn *c)
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{
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trickle_close(&c->trickle);
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uabc_close(&c->uabc);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph1_send(struct rudolph1_conn *c, clock_time_t send_interval)
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{
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c->version++;
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c->chunk = c->highest_chunk_heard = 0;
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c->trickle_interval = TRICKLE_INTERVAL;
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format_data(c, 0);
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trickle_send(&c->trickle, c->trickle_interval);
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c->chunk++;
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c->send_interval = send_interval;
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ctimer_set(&c->t, send_interval, send_next_packet, c);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph1_stop(struct rudolph1_conn *c)
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{
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ctimer_stop(&c->t);
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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