osd-contiki/core/net/rime/rudolph1.c

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2007-03-31 20:31:27 +02:00
/**
* \addtogroup rudolph1
* @{
*/
/*
* Copyright (c) 2007, 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: rudolph1.c,v 1.8 2007/04/02 19:12:37 adamdunkels Exp $
*/
/**
* \file
* Rudolph1: a simple block data flooding protocol
* \author
* Adam Dunkels <adam@sics.se>
*/
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#include <stdio.h>
#include <stddef.h> /* for offsetof */
#include "net/rime.h"
#include "net/rime/rudolph1.h"
#include "cfs/cfs.h"
#define DEFAULT_SEND_INTERVAL CLOCK_SECOND * 2
#define TRICKLE_INTERVAL TRICKLE_SECOND / 2
#define NACK_TIMEOUT CLOCK_SECOND / 4
struct rudolph1_hdr {
u8_t type;
u8_t version;
u16_t chunk;
};
#define RUDOLPH1_DATASIZE 64
struct rudolph1_datapacket {
struct rudolph1_hdr h;
u8_t datalen;
u8_t data[RUDOLPH1_DATASIZE];
};
enum {
TYPE_DATA,
TYPE_NACK,
};
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define LT(a, b) ((signed char)((a) - (b)) < 0)
/*---------------------------------------------------------------------------*/
static int
read_data(struct rudolph1_conn *c, char *dataptr, int chunk)
{
int len = 0;
if(c->cb->read_chunk) {
len = c->cb->read_chunk(c, chunk * RUDOLPH1_DATASIZE,
dataptr, RUDOLPH1_DATASIZE);
}
return len;
}
/*---------------------------------------------------------------------------*/
static int
format_data(struct rudolph1_conn *c, int chunk)
{
struct rudolph1_datapacket *p;
rimebuf_clear();
p = rimebuf_dataptr();
p->h.type = TYPE_DATA;
p->h.version = c->version;
p->h.chunk = chunk;
p->datalen = read_data(c, p->data, chunk);
rimebuf_set_datalen(sizeof(struct rudolph1_datapacket) -
(RUDOLPH1_DATASIZE - p->datalen));
return p->datalen;
}
/*---------------------------------------------------------------------------*/
static void
write_data(struct rudolph1_conn *c, int chunk, u8_t *data, int datalen)
{
if(chunk == 0) {
c->cb->write_chunk(c, 0, RUDOLPH1_FLAG_NEWFILE, data, 0);
}
if(datalen < RUDOLPH1_DATASIZE) {
PRINTF("%d: get %d bytes, file complete\n",
rimeaddr_node_addr.u16, datalen);
c->cb->write_chunk(c, chunk * RUDOLPH1_DATASIZE,
RUDOLPH1_FLAG_LASTCHUNK, data, datalen);
} else {
c->cb->write_chunk(c, chunk * RUDOLPH1_DATASIZE,
RUDOLPH1_FLAG_NONE, data, datalen);
}
}
/*---------------------------------------------------------------------------*/
static void
send_nack(struct rudolph1_conn *c)
{
struct rudolph1_hdr *hdr;
rimebuf_clear();
rimebuf_hdralloc(sizeof(struct rudolph1_hdr));
hdr = rimebuf_hdrptr();
hdr->type = TYPE_NACK;
hdr->version = c->version;
hdr->chunk = c->chunk;
PRINTF("Sending nack for %d:%d\n", hdr->version, hdr->chunk);
uabc_send(&c->uabc, CLOCK_SECOND / 4);
}
/*---------------------------------------------------------------------------*/
static void
handle_data(struct rudolph1_conn *c, struct rudolph1_datapacket *p)
{
if(LT(c->version, p->h.version)) {
PRINTF("%d.%d: rudolph1 new version %d, chunk %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
p->h.version, p->h.chunk);
c->version = p->h.version;
c->highest_chunk_heard = c->chunk = 0;
if(p->h.chunk != 0) {
send_nack(c);
} else {
write_data(c, 0, p->data, p->datalen);
c->chunk = 1; /* Next chunk is 1. */
}
/* }*/
} else if(p->h.version == c->version) {
if(p->h.chunk == c->chunk) {
PRINTF("%d.%d: received chunk %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
p->h.chunk);
write_data(c, p->h.chunk, p->data, p->datalen);
c->highest_chunk_heard = c->chunk;
c->chunk++;
} else if(p->h.chunk > c->chunk) {
PRINTF("%d: received chunk %d > %d, sending NACK\n",
rimeaddr_node_addr.u16,
p->h.chunk, c->chunk);
send_nack(c);
c->highest_chunk_heard = p->h.chunk;
} else if(p->h.chunk < c->chunk) {
/* Ignore packets with a lower chunk number */
}
/* If we have heard a higher chunk number, we send a NACK so that
we get a repair for the next packet. */
if(c->highest_chunk_heard < p->h.chunk) {
send_nack(c);
}
} else { /* p->h.version < c->current.h.version */
/* Ignore packets with old version */
}
}
/*---------------------------------------------------------------------------*/
static void
recv_trickle(struct trickle_conn *trickle)
{
struct rudolph1_conn *c = (struct rudolph1_conn *)trickle;
struct rudolph1_datapacket *p = rimebuf_dataptr();
if(p->h.type == TYPE_DATA) {
PRINTF("%d.%d: received trickle with chunk %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
p->h.chunk);
handle_data(c, p);
}
}
/*---------------------------------------------------------------------------*/
static void
recv_uabc(struct uabc_conn *uabc)
{
struct rudolph1_conn *c = (struct rudolph1_conn *)
((char *)uabc - offsetof(struct rudolph1_conn, uabc));
struct rudolph1_datapacket *p = rimebuf_dataptr();
c->nacks++;
if(p->h.type == TYPE_NACK) {
PRINTF("Got NACK for %d:%d\n", p->h.version, p->h.chunk);
if(p->h.version == c->version) {
if(p->h.chunk < c->chunk) {
/* Format and send a repair packet */
PRINTF("%d.%d: sending repair for chunk %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
p->h.chunk);
format_data(c, p->h.chunk);
uabc_send(&c->uabc, c->send_interval / 2);
}
} else if(LT(p->h.version, c->version)) {
format_data(c, 0);
uabc_send(&c->uabc, c->send_interval / 2);
}
} else if(p->h.type == TYPE_DATA) {
/* This is a repair packet from someone else. */
handle_data(c, p);
}
}
/*---------------------------------------------------------------------------*/
static void
send_next_packet(void *ptr)
{
struct rudolph1_conn *c = ptr;
int len;
if(c->nacks == 0) {
len = format_data(c, c->chunk);
trickle_send(&c->trickle, c->trickle_interval);
if(len == RUDOLPH1_DATASIZE) {
ctimer_set(&c->t, c->send_interval, send_next_packet, c);
}
c->chunk++;
} else {
ctimer_set(&c->t, c->send_interval, send_next_packet, c);
}
c->nacks = 0;
}
/*---------------------------------------------------------------------------*/
static const struct uabc_callbacks uabc = { recv_uabc, NULL, NULL };
static const struct trickle_callbacks trickle = { recv_trickle };
/*---------------------------------------------------------------------------*/
void
rudolph1_open(struct rudolph1_conn *c, u16_t channel,
const struct rudolph1_callbacks *cb)
{
trickle_open(&c->trickle, channel, &trickle);
uabc_open(&c->uabc, channel + 1, &uabc);
c->cb = cb;
c->version = 0;
c->send_interval = DEFAULT_SEND_INTERVAL;
}
/*---------------------------------------------------------------------------*/
void
rudolph1_close(struct rudolph1_conn *c)
{
trickle_close(&c->trickle);
uabc_close(&c->uabc);
}
/*---------------------------------------------------------------------------*/
void
rudolph1_send(struct rudolph1_conn *c, clock_time_t send_interval)
{
c->version++;
c->chunk = c->highest_chunk_heard = 0;
c->trickle_interval = TRICKLE_INTERVAL;
format_data(c, 0);
trickle_send(&c->trickle, c->trickle_interval);
c->chunk++;
c->send_interval = send_interval;
ctimer_set(&c->t, send_interval, send_next_packet, c);
}
/*---------------------------------------------------------------------------*/
void
rudolph1_stop(struct rudolph1_conn *c)
{
ctimer_stop(&c->t);
}
/*---------------------------------------------------------------------------*/
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/** @} */