408 lines
12 KiB
C
408 lines
12 KiB
C
/* XXX todo: add timeout so that hops_from_sink is reset to MAX
|
|
after a while. */
|
|
|
|
/* XXX todo: use a ctimer to drive peridodic transmission: the current
|
|
way does not work if a queuebuf cannot be allocated. */
|
|
|
|
/**
|
|
* \addtogroup rudolph2
|
|
* @{
|
|
*/
|
|
|
|
/*
|
|
* 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: rudolph2.c,v 1.5 2008/02/24 22:05:27 adamdunkels Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Rudolph2: a simple block data flooding protocol
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stddef.h> /* for offsetof */
|
|
|
|
#include "net/rime.h"
|
|
#include "net/rime/polite.h"
|
|
#include "net/rime/rudolph2.h"
|
|
#include "cfs/cfs.h"
|
|
|
|
#define SEND_INTERVAL CLOCK_SECOND / 2
|
|
#define STEADY_INTERVAL CLOCK_SECOND * 16
|
|
#define RESEND_INTERVAL SEND_INTERVAL * 4
|
|
#define NACK_TIMEOUT CLOCK_SECOND / 4
|
|
|
|
struct rudolph2_hdr {
|
|
uint8_t type;
|
|
uint8_t hops_from_base;
|
|
uint16_t version;
|
|
uint16_t chunk;
|
|
};
|
|
|
|
#define POLITE_HEADER 1
|
|
|
|
#define HOPS_MAX 64
|
|
|
|
enum {
|
|
TYPE_DATA,
|
|
TYPE_NACK,
|
|
};
|
|
|
|
#define FLAG_LAST_SENT 0x01
|
|
#define FLAG_LAST_RECEIVED 0x02
|
|
#define FLAG_IS_STOPPED 0x04
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
#define LT(a, b) ((signed short)((a) - (b)) < 0)
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
read_data(struct rudolph2_conn *c, uint8_t *dataptr, int chunk)
|
|
{
|
|
int len = 0;
|
|
|
|
if(c->cb->read_chunk) {
|
|
len = c->cb->read_chunk(c, chunk * RUDOLPH2_DATASIZE,
|
|
dataptr, RUDOLPH2_DATASIZE);
|
|
}
|
|
return len;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
format_data(struct rudolph2_conn *c, int chunk)
|
|
{
|
|
struct rudolph2_hdr *hdr;
|
|
int len;
|
|
|
|
rimebuf_clear();
|
|
hdr = rimebuf_dataptr();
|
|
hdr->type = TYPE_DATA;
|
|
hdr->hops_from_base = c->hops_from_base;
|
|
hdr->version = c->version;
|
|
hdr->chunk = chunk;
|
|
len = read_data(c, (uint8_t *)hdr + sizeof(struct rudolph2_hdr), chunk);
|
|
rimebuf_set_datalen(sizeof(struct rudolph2_hdr) + len);
|
|
|
|
return len;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
write_data(struct rudolph2_conn *c, int chunk, uint8_t *data, int datalen)
|
|
{
|
|
/* xxx Don't write any data if the application has been stopped. */
|
|
if(c->flags & FLAG_IS_STOPPED) {
|
|
return;
|
|
}
|
|
|
|
if(chunk == 0) {
|
|
c->cb->write_chunk(c, 0, RUDOLPH2_FLAG_NEWFILE, data, 0);
|
|
}
|
|
|
|
PRINTF("%d.%d: get %d bytes\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
datalen);
|
|
|
|
|
|
if(datalen < RUDOLPH2_DATASIZE) {
|
|
PRINTF("%d.%d: get %d bytes, file complete\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
datalen);
|
|
c->cb->write_chunk(c, chunk * RUDOLPH2_DATASIZE,
|
|
RUDOLPH2_FLAG_LASTCHUNK, data, datalen);
|
|
} else {
|
|
c->cb->write_chunk(c, chunk * RUDOLPH2_DATASIZE,
|
|
RUDOLPH2_FLAG_NONE, data, datalen);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
send_data(struct rudolph2_conn *c, clock_time_t interval)
|
|
{
|
|
int len;
|
|
|
|
len = format_data(c, c->snd_nxt);
|
|
polite_send(&c->c, interval, POLITE_HEADER);
|
|
PRINTF("%d.%d: send_data chunk %d, rcv_nxt %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
c->snd_nxt, c->rcv_nxt);
|
|
|
|
return len;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_nack(struct rudolph2_conn *c)
|
|
{
|
|
struct rudolph2_hdr *hdr;
|
|
rimebuf_clear();
|
|
rimebuf_hdralloc(sizeof(struct rudolph2_hdr));
|
|
hdr = rimebuf_hdrptr();
|
|
|
|
hdr->hops_from_base = c->hops_from_base;
|
|
hdr->type = TYPE_NACK;
|
|
hdr->version = c->version;
|
|
hdr->chunk = c->rcv_nxt;
|
|
|
|
PRINTF("%d.%d: Sending nack for %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->chunk);
|
|
polite_send(&c->c, NACK_TIMEOUT, POLITE_HEADER);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
#if 0 /* Function below not currently used in the code */
|
|
static void
|
|
send_next(struct rudolph2_conn *c)
|
|
{
|
|
int len;
|
|
clock_time_t interval;
|
|
|
|
if(c->flags & FLAG_LAST_SENT) {
|
|
interval = STEADY_INTERVAL;
|
|
} else {
|
|
interval = SEND_INTERVAL;
|
|
}
|
|
|
|
len = send_data(c, interval);
|
|
|
|
if(len < RUDOLPH2_DATASIZE) {
|
|
c->flags |= FLAG_LAST_SENT;
|
|
} else {
|
|
c->flags &= ~FLAG_LAST_SENT;
|
|
}
|
|
|
|
if(c->nacks == 0 &&
|
|
len == RUDOLPH2_DATASIZE &&
|
|
c->snd_nxt + 1 < c->rcv_nxt) {
|
|
c->snd_nxt++;
|
|
}
|
|
c->nacks = 0;
|
|
}
|
|
#endif /* 0 */
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
sent(struct polite_conn *polite)
|
|
{
|
|
/* struct rudolph2_conn *c = (struct rudolph2_conn *)polite;
|
|
|
|
if((c->flags & FLAG_IS_STOPPED) == 0 &&
|
|
(c->flags & FLAG_LAST_RECEIVED)) {
|
|
if(c->snd_nxt < c->rcv_nxt) {
|
|
send_next(c);
|
|
} else {
|
|
send_data(c, STEADY_INTERVAL);
|
|
}
|
|
}*/
|
|
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
dropped(struct polite_conn *polite)
|
|
{
|
|
/* struct rudolph2_conn *c = (struct rudolph2_conn *)polite;
|
|
if((c->flags & FLAG_IS_STOPPED) == 0 &&
|
|
(c->flags & FLAG_LAST_RECEIVED)) {
|
|
if(c->snd_nxt + 1 < c->rcv_nxt) {
|
|
send_data(c, SEND_INTERVAL);
|
|
} else {
|
|
send_data(c, STEADY_INTERVAL);
|
|
}
|
|
}*/
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
timed_send(void *ptr)
|
|
{
|
|
struct rudolph2_conn *c = (struct rudolph2_conn *)ptr;
|
|
clock_time_t interval;
|
|
int len;
|
|
|
|
if((c->flags & FLAG_IS_STOPPED) == 0 &&
|
|
(c->flags & FLAG_LAST_RECEIVED)) {
|
|
/* if(c->snd_nxt + 1 < c->rcv_nxt) {
|
|
interval = SEND_INTERVAL;
|
|
} else {
|
|
interval = STEADY_INTERVAL;
|
|
}*/
|
|
/* send_data(c, interval);*/
|
|
|
|
if(c->flags & FLAG_LAST_SENT) {
|
|
interval = STEADY_INTERVAL;
|
|
} else {
|
|
interval = SEND_INTERVAL;
|
|
}
|
|
|
|
|
|
len = send_data(c, interval);
|
|
|
|
if(len < RUDOLPH2_DATASIZE) {
|
|
c->flags |= FLAG_LAST_SENT;
|
|
} else {
|
|
c->flags &= ~FLAG_LAST_SENT;
|
|
}
|
|
|
|
if(c->nacks == 0 &&
|
|
len == RUDOLPH2_DATASIZE &&
|
|
c->snd_nxt + 1 < c->rcv_nxt) {
|
|
c->snd_nxt++;
|
|
}
|
|
c->nacks = 0;
|
|
ctimer_set(&c->t, interval, timed_send, c);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
recv(struct polite_conn *polite)
|
|
{
|
|
struct rudolph2_conn *c = (struct rudolph2_conn *)polite;
|
|
struct rudolph2_hdr *hdr = rimebuf_dataptr();
|
|
|
|
/* Only accept NACKs from nodes that are farther away from the base
|
|
than us. */
|
|
|
|
if(hdr->type == TYPE_NACK && hdr->hops_from_base > c->hops_from_base) {
|
|
c->nacks++;
|
|
PRINTF("%d.%d: Got NACK for %d:%d (%d:%d)\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->version, hdr->chunk,
|
|
c->version, c->rcv_nxt);
|
|
if(hdr->version == c->version) {
|
|
if(hdr->chunk < c->rcv_nxt) {
|
|
c->snd_nxt = hdr->chunk;
|
|
send_data(c, SEND_INTERVAL);
|
|
}
|
|
} else if(LT(hdr->version, c->version)) {
|
|
c->snd_nxt = 0;
|
|
send_data(c, SEND_INTERVAL);
|
|
}
|
|
} else if(hdr->type == TYPE_DATA) {
|
|
if(hdr->hops_from_base < c->hops_from_base) {
|
|
/* Only accept data from nodes that are closer to the base than
|
|
us. */
|
|
c->hops_from_base = hdr->hops_from_base + 1;
|
|
if(LT(c->version, hdr->version)) {
|
|
PRINTF("%d.%d: rudolph2 new version %d, chunk %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->version, hdr->chunk);
|
|
c->version = hdr->version;
|
|
c->snd_nxt = c->rcv_nxt = 0;
|
|
c->flags &= ~FLAG_LAST_RECEIVED;
|
|
c->flags &= ~FLAG_LAST_SENT;
|
|
if(hdr->chunk != 0) {
|
|
send_nack(c);
|
|
} else {
|
|
rimebuf_hdrreduce(sizeof(struct rudolph2_hdr));
|
|
write_data(c, 0, rimebuf_dataptr(), rimebuf_totlen());
|
|
}
|
|
} else if(hdr->version == c->version) {
|
|
PRINTF("%d.%d: got chunk %d snd_nxt %d rcv_nxt %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->chunk, c->snd_nxt, c->rcv_nxt);
|
|
|
|
if(hdr->chunk == c->rcv_nxt) {
|
|
int len;
|
|
rimebuf_hdrreduce(sizeof(struct rudolph2_hdr));
|
|
PRINTF("%d.%d: received chunk %d len %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->chunk, rimebuf_totlen());
|
|
len = rimebuf_totlen();
|
|
write_data(c, hdr->chunk, rimebuf_dataptr(), rimebuf_totlen());
|
|
c->rcv_nxt++;
|
|
if(len < RUDOLPH2_DATASIZE) {
|
|
c->flags |= FLAG_LAST_RECEIVED;
|
|
send_data(c, RESEND_INTERVAL);
|
|
ctimer_set(&c->t, RESEND_INTERVAL, timed_send, c);
|
|
}
|
|
} else if(hdr->chunk > c->rcv_nxt) {
|
|
PRINTF("%d.%d: received chunk %d > %d, sending NACK\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->chunk, c->rcv_nxt);
|
|
send_nack(c);
|
|
} else if(hdr->chunk < c->rcv_nxt) {
|
|
/* Ignore packets with a lower chunk number */
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static const struct polite_callbacks polite = { recv, sent, dropped };
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph2_open(struct rudolph2_conn *c, uint16_t channel,
|
|
const struct rudolph2_callbacks *cb)
|
|
{
|
|
polite_open(&c->c, channel, &polite);
|
|
c->cb = cb;
|
|
c->version = 0;
|
|
c->hops_from_base = HOPS_MAX;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph2_close(struct rudolph2_conn *c)
|
|
{
|
|
polite_close(&c->c);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph2_send(struct rudolph2_conn *c, clock_time_t send_interval)
|
|
{
|
|
int len;
|
|
|
|
c->hops_from_base = 0;
|
|
c->version++;
|
|
c->snd_nxt = 0;
|
|
len = RUDOLPH2_DATASIZE;
|
|
rimebuf_clear();
|
|
for(c->rcv_nxt = 0; len == RUDOLPH2_DATASIZE; c->rcv_nxt++) {
|
|
len = read_data(c, rimebuf_dataptr(), c->rcv_nxt);
|
|
}
|
|
c->flags = FLAG_LAST_RECEIVED;
|
|
printf("Highest chunk %d\n", c->rcv_nxt);
|
|
send_data(c, SEND_INTERVAL);
|
|
ctimer_set(&c->t, SEND_INTERVAL, timed_send, c);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
rudolph2_stop(struct rudolph2_conn *c)
|
|
{
|
|
polite_cancel(&c->c);
|
|
c->flags |= FLAG_IS_STOPPED;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/** @} */
|