236 lines
7.4 KiB
C
236 lines
7.4 KiB
C
/**
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* \addtogroup rudolph0
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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: rudolph0.c,v 1.7 2007/11/28 20:03:50 adamdunkels Exp $
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*/
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/**
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* \file
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* Rudolph0: 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 <stddef.h> /* for offsetof */
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#include "net/rime.h"
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#include "net/rime/rudolph0.h"
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#define STEADY_TIME CLOCK_SECOND * 2
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#define DEFAULT_SEND_INTERVAL CLOCK_SECOND / 2
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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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enum {
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STATE_RECEIVER,
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STATE_SENDER,
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};
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#define VERSION_LT(a, b) ((signed char)((a) - (b)) < 0)
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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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/*---------------------------------------------------------------------------*/
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static void
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read_new_datapacket(struct rudolph0_conn *c)
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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, c->current.h.chunk * RUDOLPH0_DATASIZE,
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c->current.data, RUDOLPH0_DATASIZE);
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}
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c->current.datalen = len;
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PRINTF("read_new_datapacket len %d\n", len);
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_nack(struct rudolph0_conn *c)
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{
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struct rudolph0_hdr *hdr;
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rimebuf_clear();
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rimebuf_hdralloc(sizeof(struct rudolph0_hdr));
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hdr = rimebuf_hdrptr();
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hdr->type = TYPE_NACK;
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hdr->version = c->current.h.version;
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hdr->chunk = c->current.h.chunk;
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PRINTF("Sending nack for %d:%d\n", hdr->version, hdr->chunk);
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polite_send(&c->nackc, c->send_interval / 2, sizeof(struct rudolph0_hdr));
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}
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/*---------------------------------------------------------------------------*/
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static void
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sent(struct sabc_conn *sabc)
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{
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struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
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if(c->current.datalen == RUDOLPH0_DATASIZE) {
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c->current.h.chunk++;
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PRINTF("Sending data chunk %d next time\n", c->current.h.chunk);
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read_new_datapacket(c);
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} else {
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sabc_set_timer(&c->c, STEADY_TIME);
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PRINTF("Steady: Sending the same data chunk next time datalen %d, %d\n",
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c->current.datalen, RUDOLPH0_DATASIZE);
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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recv(struct sabc_conn *sabc)
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{
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struct rudolph0_conn *c = (struct rudolph0_conn *)sabc;
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struct rudolph0_datapacket *p = rimebuf_dataptr();
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if(p->h.type == TYPE_DATA) {
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if(c->current.h.version != p->h.version) {
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PRINTF("rudolph0 new version %d\n", p->h.version);
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c->current.h.version = p->h.version;
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c->current.h.chunk = 0;
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c->cb->write_chunk(c, 0, RUDOLPH0_FLAG_NEWFILE, p->data, 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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c->cb->write_chunk(c, 0, RUDOLPH0_FLAG_NONE, p->data, p->datalen);
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c->current.h.chunk++;
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}
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} else if(p->h.version == c->current.h.version) {
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if(p->h.chunk == c->current.h.chunk) {
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PRINTF("received chunk %d\n", p->h.chunk);
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if(p->datalen < RUDOLPH0_DATASIZE) {
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c->cb->write_chunk(c, c->current.h.chunk * RUDOLPH0_DATASIZE,
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RUDOLPH0_FLAG_LASTCHUNK, p->data, p->datalen);
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} else {
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c->cb->write_chunk(c, c->current.h.chunk * RUDOLPH0_DATASIZE,
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RUDOLPH0_FLAG_NONE, p->data, p->datalen);
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}
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c->current.h.chunk++;
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} else if(p->h.chunk > c->current.h.chunk) {
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PRINTF("received chunk %d > %d, sending NACK\n", p->h.chunk, c->current.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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/*---------------------------------------------------------------------------*/
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static void
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recv_nack(struct polite_conn *polite)
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{
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struct rudolph0_conn *c = (struct rudolph0_conn *)
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((char *)polite - offsetof(struct rudolph0_conn,
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nackc));
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struct rudolph0_datapacket *p = rimebuf_dataptr();
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if(p->h.type == TYPE_NACK && c->state == STATE_SENDER) {
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if(p->h.version == c->current.h.version) {
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PRINTF("Reseting chunk to %d\n", p->h.chunk);
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c->current.h.chunk = p->h.chunk;
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} else {
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PRINTF("Wrong version, reseting chunk to 0\n");
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c->current.h.chunk = 0;
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}
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read_new_datapacket(c);
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sabc_set_timer(&c->c, c->send_interval);
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}
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}
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/*---------------------------------------------------------------------------*/
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static const struct polite_callbacks polite = { recv_nack, 0, 0 };
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static const struct sabc_callbacks sabc = { recv, sent };
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_open(struct rudolph0_conn *c, u16_t channel,
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const struct rudolph0_callbacks *cb)
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{
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sabc_open(&c->c, channel, &sabc);
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polite_open(&c->nackc, channel + 1, &polite);
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c->cb = cb;
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c->current.h.version = 0;
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c->state = STATE_RECEIVER;
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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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rudolph0_close(struct rudolph0_conn *c)
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{
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sabc_close(&c->c);
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polite_close(&c->nackc);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_send(struct rudolph0_conn *c, clock_time_t send_interval)
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{
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c->state = STATE_SENDER;
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c->current.h.version++;
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c->current.h.version++;
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c->current.h.chunk = 0;
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c->current.h.type = TYPE_DATA;
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read_new_datapacket(c);
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rimebuf_reference(&c->current, sizeof(struct rudolph0_datapacket));
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c->send_interval = send_interval;
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sabc_send_stubborn(&c->c, c->send_interval);
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_stop(struct rudolph0_conn *c)
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{
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sabc_cancel(&c->c);
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}
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/*---------------------------------------------------------------------------*/
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int
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rudolph0_version(struct rudolph0_conn *c)
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{
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return c->current.h.version;
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}
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/*---------------------------------------------------------------------------*/
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void
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rudolph0_set_version(struct rudolph0_conn *c, int version)
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{
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c->current.h.version = version;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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