contiki/core/net/rime/tree.c

277 lines
8.0 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: tree.c,v 1.7 2007/03/23 10:46:35 adamdunkels Exp $
*/
/**
* \file
* A brief description of what this file is.
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/neighbor.h"
#include "net/rime/tree.h"
#include "dev/radio-sensor.h"
#if NETSIM
#include "ether.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stddef.h>
struct adv_msg {
u8_t hopcount;
u8_t pad;
};
struct hdr {
rimeaddr_t originator;
u8_t originator_seqno;
u8_t hopcount;
u8_t hoplim;
u8_t retransmissions;
u8_t datalen;
u8_t data[1];
};
#define SINK 0
#define HOPCOUNT_MAX TREE_MAX_DEPTH
#define MAX_HOPLIM 10
#define MAX_INTERVAL CLOCK_SECOND * 4
/*---------------------------------------------------------------------------*/
static void
update_hopcount(struct tree_conn *tc)
{
struct neighbor *n;
if(tc->hops_from_sink != SINK) {
n = neighbor_best();
if(n == NULL) {
/* if(hopcount != HOPCOUNT_MAX) {
printf("%d: didn't find a best neighbor, setting hopcount to max\n", node_id);
}*/
tc->hops_from_sink = HOPCOUNT_MAX;
} else {
if(n->hopcount + 1 != tc->hops_from_sink) {
tc->hops_from_sink = n->hopcount + 1;
}
}
}
/* DEBUG_PRINTF("%d: new hopcount %d\n", node_id, hopcount);*/
#if NETSIM
{
char buf[8];
if(tc->hops_from_sink == HOPCOUNT_MAX) {
strcpy(buf, " ");
} else {
snprintf(buf, sizeof(buf), "%d", tc->hops_from_sink);
}
ether_set_text(buf);
}
#endif
}
/*---------------------------------------------------------------------------*/
static void
send_adv(struct tree_conn *tc)
{
struct adv_msg *hdr;
rimebuf_clear();
rimebuf_set_datalen(sizeof(struct adv_msg));
hdr = rimebuf_dataptr();
hdr->hopcount = tc->hops_from_sink;
uibc_send(&tc->uibc_conn, MAX_INTERVAL);
}
/*---------------------------------------------------------------------------*/
static void
adv_packet_received(struct uibc_conn *c, rimeaddr_t *from)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, uibc_conn));
struct adv_msg *msg = rimebuf_dataptr();
struct neighbor *n;
/* printf("%d: neighbor_packet_received from %d with hopcount %d\n",
node_id, from, hdr->hopcount
);*/
n = neighbor_find(from);
if(n == NULL) {
neighbor_add(from, msg->hopcount, radio_sensor.value(1));
} else {
neighbor_update(n, msg->hopcount, radio_sensor.value(1));
}
update_hopcount(tc);
}
/*---------------------------------------------------------------------------*/
static void
adv_packet_sent(struct uibc_conn *c)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, uibc_conn));
send_adv(tc);
}
/*---------------------------------------------------------------------------*/
static void
adv_packet_dropped(struct uibc_conn *c)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, uibc_conn));
send_adv(tc);
}
/*---------------------------------------------------------------------------*/
static int
node_packet_received(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, ruc_conn));
struct hdr *hdr = rimebuf_dataptr();
struct neighbor *n;
if(tc->hops_from_sink == SINK) {
if(tc->cb->recv != NULL) {
tc->cb->recv(&hdr->originator, hdr->originator_seqno,
hdr->hopcount, hdr->retransmissions);
}
return 1;
} else if(hdr->hoplim > 1 && tc->hops_from_sink != HOPCOUNT_MAX) {
hdr->hoplim--;
/* printf("%d: packet received from %d, forwarding %d, best neighbor %p\n",
rimeaddr_node_addr.u16[0], from->u16[0], tc->forwarding, neighbor_best());*/
if(!tc->forwarding) {
tc->forwarding = 1;
n = neighbor_best();
if(n != NULL) {
ruc_send(c, &n->addr);
}
return 1;
} else {
/* printf("%d: still forwarding another packet, not sending ACK\n",
rimeaddr_node_addr.u16[0]);*/
return 0;
}
}
return 1;
}
/*---------------------------------------------------------------------------*/
static void
node_packet_sent(struct ruc_conn *c)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, ruc_conn));
tc->forwarding = 0;
}
/*---------------------------------------------------------------------------*/
static const struct uibc_callbacks uibc_callbacks =
{adv_packet_received, adv_packet_sent, adv_packet_dropped};
static const struct ruc_callbacks ruc_callbacks = {node_packet_received,
node_packet_sent};
/*---------------------------------------------------------------------------*/
void
tree_open(struct tree_conn *tc, u16_t channels,
const struct tree_callbacks *cb)
{
uibc_open(&tc->uibc_conn, channels, &uibc_callbacks);
ruc_open(&tc->ruc_conn, channels + 1, &ruc_callbacks);
tc->hops_from_sink = HOPCOUNT_MAX;
/* rimebuf_clear();
rimebuf_reference(&tc.hello, sizeof(tc.hello));
sibc_send_stubborn(&sibc_conn, CLOCK_SECOND * 8);*/
tc->cb = cb;
send_adv(tc);
}
/*---------------------------------------------------------------------------*/
void
tree_close(struct tree_conn *tc)
{
uibc_close(&tc->uibc_conn);
ruc_close(&tc->ruc_conn);
}
/*---------------------------------------------------------------------------*/
void
tree_set_sink(struct tree_conn *tc, int should_be_sink)
{
if(should_be_sink) {
tc->hops_from_sink = SINK;
} else {
tc->hops_from_sink = HOPCOUNT_MAX;
}
update_hopcount(tc);
}
/*---------------------------------------------------------------------------*/
void
tree_send(struct tree_conn *tc)
{
struct neighbor *n;
struct hdr *hdr;
if(rimebuf_hdralloc(sizeof(struct hdr))) {
hdr = rimebuf_hdrptr();
hdr->originator_seqno = tc->seqno++;
rimeaddr_copy(&hdr->originator, &rimeaddr_node_addr);
hdr->hopcount = tc->hops_from_sink;
hdr->hoplim = MAX_HOPLIM;
hdr->retransmissions = 0;
hdr->datalen = 0;
n = neighbor_best();
if(n != NULL) {
/* printf("Sending to best neighbor\n");*/
ruc_send(&tc->ruc_conn, &n->addr);
} else {
/* printf("Didn't find any neighbor\n");*/
}
}
}
/*---------------------------------------------------------------------------*/
int
tree_depth(struct tree_conn *tc)
{
return tc->hops_from_sink;
}
/*---------------------------------------------------------------------------*/