409 lines
12 KiB
C
409 lines
12 KiB
C
/* XXX todo: add timeout so that hops_from_sink is reset to MAX
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after a while. */
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/* XXX todo: use a ctimer to drive peridodic transmission: the current
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way does not work if a queuebuf cannot be allocated. */
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/**
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* \addtogroup rudolph2
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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: rudolph2.c,v 1.7 2009/03/12 21:58:21 adamdunkels Exp $
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*/
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/**
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* \file
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* Rudolph2: 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/polite.h"
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#include "net/rime/rudolph2.h"
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#include "cfs/cfs.h"
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#define SEND_INTERVAL CLOCK_SECOND / 2
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#define STEADY_INTERVAL CLOCK_SECOND * 16
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#define RESEND_INTERVAL SEND_INTERVAL * 4
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#define NACK_TIMEOUT CLOCK_SECOND / 4
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struct rudolph2_hdr {
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uint8_t type;
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uint8_t hops_from_base;
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uint16_t version;
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uint16_t chunk;
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};
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#define POLITE_HEADER 1
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#define HOPS_MAX 64
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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 FLAG_LAST_SENT 0x01
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#define FLAG_LAST_RECEIVED 0x02
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#define FLAG_IS_STOPPED 0x04
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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 short)((a) - (b)) < 0)
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/*---------------------------------------------------------------------------*/
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static int
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read_data(struct rudolph2_conn *c, uint8_t *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 * RUDOLPH2_DATASIZE,
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dataptr, RUDOLPH2_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 rudolph2_conn *c, int chunk)
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{
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struct rudolph2_hdr *hdr;
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int len;
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packetbuf_clear();
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hdr = packetbuf_dataptr();
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hdr->type = TYPE_DATA;
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hdr->hops_from_base = c->hops_from_base;
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hdr->version = c->version;
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hdr->chunk = chunk;
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len = read_data(c, (uint8_t *)hdr + sizeof(struct rudolph2_hdr), chunk);
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packetbuf_set_datalen(sizeof(struct rudolph2_hdr) + len);
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static void
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write_data(struct rudolph2_conn *c, int chunk, uint8_t *data, int datalen)
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{
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/* xxx Don't write any data if the application has been stopped. */
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if(c->flags & FLAG_IS_STOPPED) {
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return;
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}
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if(chunk == 0) {
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c->cb->write_chunk(c, 0, RUDOLPH2_FLAG_NEWFILE, data, 0);
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}
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PRINTF("%d.%d: get %d bytes\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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datalen);
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if(datalen < RUDOLPH2_DATASIZE) {
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PRINTF("%d.%d: get %d bytes, file complete\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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datalen);
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c->cb->write_chunk(c, chunk * RUDOLPH2_DATASIZE,
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RUDOLPH2_FLAG_LASTCHUNK, data, datalen);
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} else {
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c->cb->write_chunk(c, chunk * RUDOLPH2_DATASIZE,
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RUDOLPH2_FLAG_NONE, data, datalen);
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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send_data(struct rudolph2_conn *c, clock_time_t interval)
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{
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int len;
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len = format_data(c, c->snd_nxt);
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polite_send(&c->c, interval, POLITE_HEADER);
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PRINTF("%d.%d: send_data chunk %d, rcv_nxt %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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c->snd_nxt, c->rcv_nxt);
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return len;
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_nack(struct rudolph2_conn *c)
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{
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struct rudolph2_hdr *hdr;
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packetbuf_clear();
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packetbuf_hdralloc(sizeof(struct rudolph2_hdr));
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hdr = packetbuf_hdrptr();
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hdr->hops_from_base = c->hops_from_base;
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hdr->type = TYPE_NACK;
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hdr->version = c->version;
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hdr->chunk = c->rcv_nxt;
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PRINTF("%d.%d: Sending nack for %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->chunk);
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polite_send(&c->c, NACK_TIMEOUT, POLITE_HEADER);
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}
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/*---------------------------------------------------------------------------*/
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#if 0 /* Function below not currently used in the code */
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static void
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send_next(struct rudolph2_conn *c)
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{
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int len;
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clock_time_t interval;
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if(c->flags & FLAG_LAST_SENT) {
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interval = STEADY_INTERVAL;
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} else {
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interval = SEND_INTERVAL;
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}
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len = send_data(c, interval);
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if(len < RUDOLPH2_DATASIZE) {
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c->flags |= FLAG_LAST_SENT;
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} else {
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c->flags &= ~FLAG_LAST_SENT;
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}
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if(c->nacks == 0 &&
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len == RUDOLPH2_DATASIZE &&
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c->snd_nxt + 1 < c->rcv_nxt) {
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c->snd_nxt++;
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}
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c->nacks = 0;
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}
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#endif /* 0 */
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/*---------------------------------------------------------------------------*/
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static void
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sent(struct polite_conn *polite)
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{
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/* struct rudolph2_conn *c = (struct rudolph2_conn *)polite;
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if((c->flags & FLAG_IS_STOPPED) == 0 &&
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(c->flags & FLAG_LAST_RECEIVED)) {
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if(c->snd_nxt < c->rcv_nxt) {
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send_next(c);
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} else {
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send_data(c, STEADY_INTERVAL);
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}
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}*/
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}
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/*---------------------------------------------------------------------------*/
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static void
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dropped(struct polite_conn *polite)
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{
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/* struct rudolph2_conn *c = (struct rudolph2_conn *)polite;
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if((c->flags & FLAG_IS_STOPPED) == 0 &&
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(c->flags & FLAG_LAST_RECEIVED)) {
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if(c->snd_nxt + 1 < c->rcv_nxt) {
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send_data(c, SEND_INTERVAL);
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} else {
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send_data(c, STEADY_INTERVAL);
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}
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}*/
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}
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/*---------------------------------------------------------------------------*/
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static void
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timed_send(void *ptr)
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{
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struct rudolph2_conn *c = (struct rudolph2_conn *)ptr;
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clock_time_t interval;
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int len;
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if((c->flags & FLAG_IS_STOPPED) == 0 &&
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(c->flags & FLAG_LAST_RECEIVED)) {
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/* if(c->snd_nxt + 1 < c->rcv_nxt) {
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interval = SEND_INTERVAL;
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} else {
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interval = STEADY_INTERVAL;
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}*/
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/* send_data(c, interval);*/
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if(c->flags & FLAG_LAST_SENT) {
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interval = STEADY_INTERVAL;
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} else {
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interval = SEND_INTERVAL;
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}
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len = send_data(c, interval);
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if(len < RUDOLPH2_DATASIZE) {
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c->flags |= FLAG_LAST_SENT;
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} else {
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c->flags &= ~FLAG_LAST_SENT;
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}
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if(c->nacks == 0 &&
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len == RUDOLPH2_DATASIZE &&
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c->snd_nxt + 1 < c->rcv_nxt) {
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c->snd_nxt++;
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}
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c->nacks = 0;
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ctimer_set(&c->t, interval, timed_send, c);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv(struct polite_conn *polite)
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{
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struct rudolph2_conn *c = (struct rudolph2_conn *)polite;
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struct rudolph2_hdr *hdr = packetbuf_dataptr();
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/* Only accept NACKs from nodes that are farther away from the base
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than us. */
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if(hdr->type == TYPE_NACK && hdr->hops_from_base > c->hops_from_base) {
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c->nacks++;
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PRINTF("%d.%d: Got NACK for %d:%d (%d:%d)\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->version, hdr->chunk,
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c->version, c->rcv_nxt);
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if(hdr->version == c->version) {
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if(hdr->chunk < c->rcv_nxt) {
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c->snd_nxt = hdr->chunk;
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send_data(c, SEND_INTERVAL);
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}
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} else if(LT(hdr->version, c->version)) {
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c->snd_nxt = 0;
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send_data(c, SEND_INTERVAL);
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}
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} else if(hdr->type == TYPE_DATA) {
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if(hdr->hops_from_base < c->hops_from_base) {
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/* Only accept data from nodes that are closer to the base than
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us. */
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c->hops_from_base = hdr->hops_from_base + 1;
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if(LT(c->version, hdr->version)) {
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PRINTF("%d.%d: rudolph2 new version %d, chunk %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->version, hdr->chunk);
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c->version = hdr->version;
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c->snd_nxt = c->rcv_nxt = 0;
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c->flags &= ~FLAG_LAST_RECEIVED;
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c->flags &= ~FLAG_LAST_SENT;
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if(hdr->chunk != 0) {
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send_nack(c);
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} else {
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packetbuf_hdrreduce(sizeof(struct rudolph2_hdr));
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write_data(c, 0, packetbuf_dataptr(), packetbuf_totlen());
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}
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} else if(hdr->version == c->version) {
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PRINTF("%d.%d: got chunk %d snd_nxt %d rcv_nxt %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->chunk, c->snd_nxt, c->rcv_nxt);
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if(hdr->chunk == c->rcv_nxt) {
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int len;
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packetbuf_hdrreduce(sizeof(struct rudolph2_hdr));
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PRINTF("%d.%d: received chunk %d len %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->chunk, packetbuf_totlen());
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len = packetbuf_totlen();
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write_data(c, hdr->chunk, packetbuf_dataptr(), packetbuf_totlen());
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c->rcv_nxt++;
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if(len < RUDOLPH2_DATASIZE) {
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c->flags |= FLAG_LAST_RECEIVED;
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send_data(c, RESEND_INTERVAL);
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ctimer_set(&c->t, RESEND_INTERVAL, timed_send, c);
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}
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} else if(hdr->chunk > c->rcv_nxt) {
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PRINTF("%d.%d: received chunk %d > %d, sending NACK\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->chunk, c->rcv_nxt);
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send_nack(c);
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} else if(hdr->chunk < c->rcv_nxt) {
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/* Ignore packets with a lower chunk number */
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}
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}
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct polite_callbacks polite = { recv, sent, dropped };
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/*---------------------------------------------------------------------------*/
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void
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rudolph2_open(struct rudolph2_conn *c, uint16_t channel,
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const struct rudolph2_callbacks *cb)
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{
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polite_open(&c->c, channel, &polite);
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c->cb = cb;
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c->version = 0;
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c->hops_from_base = HOPS_MAX;
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph2_close(struct rudolph2_conn *c)
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{
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polite_close(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph2_send(struct rudolph2_conn *c, clock_time_t send_interval)
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{
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int len;
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c->hops_from_base = 0;
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c->version++;
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c->snd_nxt = 0;
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len = RUDOLPH2_DATASIZE;
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packetbuf_clear();
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for(c->rcv_nxt = 0; len == RUDOLPH2_DATASIZE; c->rcv_nxt++) {
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len = read_data(c, packetbuf_dataptr(), c->rcv_nxt);
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}
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c->flags = FLAG_LAST_RECEIVED;
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/* printf("Highest chunk %d\n", c->rcv_nxt);*/
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send_data(c, SEND_INTERVAL);
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ctimer_set(&c->t, SEND_INTERVAL, timed_send, c);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph2_stop(struct rudolph2_conn *c)
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{
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polite_cancel(&c->c);
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c->flags |= FLAG_IS_STOPPED;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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