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

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/**
* \addtogroup rimetree
* @{
*/
/*
* 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 1.16 2007/11/26 23:31:44 adamdunkels Exp $
*/
/**
* \file
* Tree-based hop-by-hop reliable data collection
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/neighbor.h"
#include "net/rime/nf.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 hdr {
rimeaddr_t originator;
u8_t originator_seqno;
u8_t hops;
u8_t hoplim;
u8_t rexmits;
};
#define NUM_RECENT_PACKETS 4
struct recent_packet {
rimeaddr_t originator;
uint8_t seqno;
};
static struct recent_packet recent_packets[NUM_RECENT_PACKETS];
static uint8_t recent_packet_ptr;
#define SINK 0
#define RTMETRIC_MAX TREE_MAX_DEPTH
#define MAX_HOPLIM 10
#define MAX_INTERVAL CLOCK_SECOND * 10
#define MIN_INTERVAL CLOCK_SECOND * 2
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
update_rtmetric(struct tree_conn *tc)
{
struct neighbor *n;
/* We should only update the rtmetric if we are not the sink. */
if(tc->local_rtmetric != SINK) {
/* Find the neighbor with the lowest rtmetric. */
n = neighbor_best();
/* If n is NULL, we have no best neighbor. */
if(n == NULL) {
/* If we have don't have any neighbors, we set our rtmetric to
the maximum value to indicate that we do not have a route. */
if(tc->local_rtmetric != RTMETRIC_MAX) {
PRINTF("%d.%d: didn't find a best neighbor, setting rtmetric to max\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
tc->local_rtmetric = RTMETRIC_MAX;
} else {
/* We set our rtmetric to the rtmetric of our best neighbor plus
the expected transmissions to reach that neighbor. */
if(n->rtmetric + neighbor_etx(n) != tc->local_rtmetric) {
tc->local_rtmetric = n->rtmetric + neighbor_etx(n);
nbh_start(&tc->nbh_conn, tc->local_rtmetric);
/* send_adv(tc, MIN_INTERVAL);*/
PRINTF("%d.%d: new rtmetric %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
tc->local_rtmetric);
}
}
}
/* DEBUG_PRINTF("%d: new rtmetric %d\n", node_id, rtmetric);*/
#if NETSIM
{
char buf[8];
if(tc->local_rtmetric == RTMETRIC_MAX) {
strcpy(buf, " ");
} else {
sprintf(buf, "%d", tc->local_rtmetric);
}
ether_set_text(buf);
}
#endif
}
/*---------------------------------------------------------------------------*/
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;
int i;
/* To protect against forwarding duplicate packets, we keep a list
of recently forwarded packet seqnos. If the seqno of the current
packet exists in the list, we drop the packet. */
for(i = 0; i < NUM_RECENT_PACKETS; i++) {
if(recent_packets[i].seqno == hdr->originator_seqno &&
rimeaddr_cmp(&recent_packets[i].originator, &hdr->originator)) {
/* Drop the packet. */
return 1;
}
}
recent_packets[recent_packet_ptr].seqno = hdr->originator_seqno;
rimeaddr_copy(&recent_packets[recent_packet_ptr].originator, &hdr->originator);
recent_packet_ptr = (recent_packet_ptr + 1) % NUM_RECENT_PACKETS;
if(tc->local_rtmetric == SINK) {
/* If we are the sink, we call the receive function. */
rimebuf_hdrreduce(sizeof(struct hdr));
PRINTF("%d.%d: sink received packet from %d.%d via %d.%d with rtmetric %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->originator.u8[0], hdr->originator.u8[1],
from->u8[0], from->u8[1], hdr->rtmetric);
if(tc->cb->recv != NULL) {
tc->cb->recv(&hdr->originator, hdr->originator_seqno,
hdr->hops);
}
return 1;
} else if(hdr->hoplim > 1 && tc->local_rtmetric != RTMETRIC_MAX) {
/* If we are not the sink, we forward the packet to the best
neighbor. */
hdr->hops++;
hdr->hoplim--;
PRINTF("%d.%d: packet received from %d.%d via %d.%d with rtmetric %d, best neighbor %p, forwarding %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
hdr->originator.u8[0], hdr->originator.u8[1],
from->u8[0], from->u8[1], hdr->rtmetric,
neighbor_best(), tc->forwarding);
if(!tc->forwarding) {
tc->forwarding = 1;
n = neighbor_best();
if(n != NULL) {
ruc_send(c, &n->addr, hdr->rexmits);
}
return 1;
} else {
PRINTF("%d.%d: still forwarding another packet, not sending ACK\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
return 0;
}
}
return 1;
}
/*---------------------------------------------------------------------------*/
static void
node_packet_sent(struct ruc_conn *c, rimeaddr_t *to, u8_t retransmissions)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, ruc_conn));
tc->forwarding = 0;
neighbor_update_etx(neighbor_find(to), retransmissions);
update_rtmetric(tc);
}
/*---------------------------------------------------------------------------*/
static void
node_packet_timedout(struct ruc_conn *c, rimeaddr_t *to, u8_t retransmissions)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, ruc_conn));
tc->forwarding = 0;
neighbor_timedout_etx(neighbor_find(to), retransmissions);
update_rtmetric(tc);
}
/*---------------------------------------------------------------------------*/
static void
adv_received(struct nbh_conn *c, rimeaddr_t *from, uint16_t rtmetric)
{
struct tree_conn *tc = (struct tree_conn *)
((char *)c - offsetof(struct tree_conn, nbh_conn));
struct neighbor *n;
n = neighbor_find(from);
if(n == NULL) {
neighbor_add(from, rtmetric, 1);
} else {
neighbor_update(n, rtmetric);
PRINTF("%d.%d: updating neighbor %d.%d, etx %d, hops %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1],
1, rtmetric);
}
update_rtmetric(tc);
}
/*---------------------------------------------------------------------------*/
static const struct ruc_callbacks ruc_callbacks = {node_packet_received,
node_packet_sent,
node_packet_timedout};
static const struct nbh_callbacks nbh_callbacks = { adv_received,
NULL};
/*---------------------------------------------------------------------------*/
void
tree_open(struct tree_conn *tc, u16_t channels,
const struct tree_callbacks *cb)
{
nbh_open(&tc->nbh_conn, channels, &nbh_callbacks);
ruc_open(&tc->ruc_conn, channels + 1, &ruc_callbacks);
tc->local_rtmetric = RTMETRIC_MAX;
tc->cb = cb;
}
/*---------------------------------------------------------------------------*/
void
tree_close(struct tree_conn *tc)
{
nbh_close(&tc->nbh_conn);
ruc_close(&tc->ruc_conn);
}
/*---------------------------------------------------------------------------*/
void
tree_set_sink(struct tree_conn *tc, int should_be_sink)
{
if(should_be_sink) {
tc->local_rtmetric = SINK;
nbh_start(&tc->nbh_conn, tc->local_rtmetric);
} else {
tc->local_rtmetric = RTMETRIC_MAX;
}
update_rtmetric(tc);
}
/*---------------------------------------------------------------------------*/
void
tree_send(struct tree_conn *tc, int rexmits)
{
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->hops = 0;
hdr->hoplim = MAX_HOPLIM;
hdr->rexmits = rexmits;
if(tc->local_rtmetric == 0) {
if(tc->cb->recv != NULL) {
tc->cb->recv(&hdr->originator, hdr->originator_seqno,
hdr->hops);
}
} else {
n = neighbor_best();
if(n != NULL) {
/* printf("Sending to best neighbor\n");*/
ruc_send(&tc->ruc_conn, &n->addr, rexmits);
} else {
/* printf("Didn't find any neighbor\n");*/
PRINTF("%d.%d: did not find any neighbor to send to\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
}
}
}
/*---------------------------------------------------------------------------*/
int
tree_depth(struct tree_conn *tc)
{
return tc->local_rtmetric;
}
/*---------------------------------------------------------------------------*/
/** @} */
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