mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-12-23 16:29:34 +00:00
205 lines
5.8 KiB
C
205 lines
5.8 KiB
C
/*
|
|
* Copyright (c) 2006, 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: nf.c,v 1.9 2007/03/23 10:46:35 adamdunkels Exp $
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Best-effort network flooding (nf)
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*/
|
|
|
|
#include "net/rime/nf.h"
|
|
#include "net/rime.h"
|
|
#include "lib/rand.h"
|
|
#include <string.h>
|
|
|
|
#define QUEUE_TIME CLOCK_SECOND / 4
|
|
|
|
#define HOPS_MAX 16
|
|
|
|
struct nf_hdr {
|
|
u8_t hops;
|
|
u8_t originator_seqno;
|
|
rimeaddr_t originator;
|
|
};
|
|
|
|
static u8_t seqno;
|
|
|
|
static void send(void *ptr);
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
set_timer(struct nf_conn *c)
|
|
{
|
|
ctimer_set(&c->t, QUEUE_TIME, send, c);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send(void *ptr)
|
|
{
|
|
struct nf_conn *c = ptr;
|
|
|
|
if(c->packets_received > 0) {
|
|
c->packets_received = 0;
|
|
set_timer(c);
|
|
} else {
|
|
/* DEBUGF(3, "nf: send()\n");*/
|
|
queuebuf_to_rimebuf(c->buf);
|
|
queuebuf_free(c->buf);
|
|
c->buf = NULL;
|
|
PRINTF("%d.%d: nf send to uibc\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
|
|
uibc_send(&c->c, QUEUE_TIME);
|
|
if(c->u->sent != NULL) {
|
|
c->u->sent(c);
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
queue_for_send(struct nf_conn *c)
|
|
{
|
|
if(c->buf == NULL) {
|
|
c->buf = queuebuf_new_from_rimebuf();
|
|
}
|
|
if(c->buf == NULL) {
|
|
return 0;
|
|
}
|
|
c->packets_received = 0;
|
|
set_timer(c);
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
recv_from_uibc(struct uibc_conn *uibc, rimeaddr_t *from)
|
|
{
|
|
register struct nf_conn *c = (struct nf_conn *)uibc;
|
|
struct nf_hdr *hdr = rimebuf_dataptr();
|
|
u8_t hops;
|
|
struct queuebuf *queuebuf;
|
|
|
|
c->packets_received++;
|
|
|
|
hops = hdr->hops;
|
|
|
|
/* Remember packet if we need to forward it. */
|
|
queuebuf = queuebuf_new_from_rimebuf();
|
|
|
|
rimebuf_hdrreduce(sizeof(struct nf_hdr));
|
|
if(c->u->recv != NULL) {
|
|
if(!(rimeaddr_cmp(&hdr->originator, &c->last_originator) &&
|
|
hdr->originator_seqno <= c->last_originator_seqno)) {
|
|
|
|
if(c->u->recv(c, from, &hdr->originator, hdr->originator_seqno,
|
|
hops)) {
|
|
|
|
if(queuebuf != NULL) {
|
|
queuebuf_to_rimebuf(queuebuf);
|
|
queuebuf_free(queuebuf);
|
|
queuebuf = NULL;
|
|
hdr = rimebuf_dataptr();
|
|
|
|
/* Rebroadcast received packet. */
|
|
if(hops < HOPS_MAX) {
|
|
PRINTF("%d.%d: nf rebroadcasting %d.%d/%d (%d.%d/%d) hops %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
hdr->originator.u8[0], hdr->originator.u8[1],
|
|
hdr->originator_seqno,
|
|
c->last_originator.u8[0], c->last_originator.u8[1],
|
|
c->last_originator_seqno,
|
|
hops);
|
|
hdr->hops++;
|
|
queue_for_send(c);
|
|
rimeaddr_copy(&c->last_originator, &hdr->originator);
|
|
c->last_originator_seqno = hdr->originator_seqno;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if(queuebuf != NULL) {
|
|
queuebuf_free(queuebuf);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static const struct uibc_callbacks nf = {recv_from_uibc, NULL, NULL};
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
nf_open(struct nf_conn *c, u16_t channel,
|
|
const struct nf_callbacks *u)
|
|
{
|
|
uibc_open(&c->c, channel, &nf);
|
|
c->u = u;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
nf_close(struct nf_conn *c)
|
|
{
|
|
uibc_close(&c->c);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
nf_send(struct nf_conn *c)
|
|
{
|
|
if(c->buf != NULL) {
|
|
queuebuf_free(c->buf);
|
|
c->buf = NULL;
|
|
}
|
|
|
|
if(rimebuf_hdralloc(sizeof(struct nf_hdr))) {
|
|
struct nf_hdr *hdr = rimebuf_hdrptr();
|
|
rimeaddr_copy(&hdr->originator, &rimeaddr_node_addr);
|
|
rimeaddr_copy(&c->last_originator, &hdr->originator);
|
|
c->last_originator_seqno = hdr->originator_seqno = ++seqno;
|
|
hdr->hops = 0;
|
|
return queue_for_send(c);
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
nf_cancel(struct nf_conn *c)
|
|
{
|
|
ctimer_stop(&c->t);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|