341 lines
10 KiB
C
341 lines
10 KiB
C
/* XXX: send explicit congestion notification if already forwarding
|
|
packet + add queue for keeping packets to forward. */
|
|
|
|
/**
|
|
* \addtogroup rimecollect
|
|
* @{
|
|
*/
|
|
|
|
/*
|
|
* 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: collect.c,v 1.5 2008/01/24 21:11:40 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/collect.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 COLLECT_MAX_DEPTH
|
|
|
|
#define MAX_HOPLIM 10
|
|
|
|
#define DEBUG 0
|
|
#if DEBUG
|
|
#include <stdio.h>
|
|
#define PRINTF(...) printf(__VA_ARGS__)
|
|
#else
|
|
#define PRINTF(...)
|
|
#endif
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
update_rtmetric(struct collect_conn *tc)
|
|
{
|
|
struct neighbor *n;
|
|
|
|
/* We should only update the rtmetric if we are not the sink. */
|
|
if(tc->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->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->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->rtmetric) {
|
|
tc->rtmetric = n->rtmetric + neighbor_etx(n);
|
|
neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
|
|
PRINTF("%d.%d: new rtmetric %d\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
|
|
tc->rtmetric);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* DEBUG_PRINTF("%d: new rtmetric %d\n", node_id, rtmetric);*/
|
|
#if NETSIM
|
|
{
|
|
char buf[8];
|
|
if(tc->rtmetric == RTMETRIC_MAX) {
|
|
strcpy(buf, " ");
|
|
} else {
|
|
sprintf(buf, "%.1f", (float)tc->rtmetric / NEIGHBOR_ETX_SCALE);
|
|
}
|
|
ether_set_text(buf);
|
|
}
|
|
#endif
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
node_packet_received(struct ruc_conn *c, rimeaddr_t *from, u8_t seqno)
|
|
{
|
|
struct collect_conn *tc = (struct collect_conn *)
|
|
((char *)c - offsetof(struct collect_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;
|
|
}
|
|
}
|
|
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->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;
|
|
} else if(hdr->hoplim > 1 && tc->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;
|
|
} else {
|
|
|
|
PRINTF("%d.%d: still forwarding another packet\n",
|
|
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
|
|
return;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
node_packet_sent(struct ruc_conn *c, rimeaddr_t *to, u8_t retransmissions)
|
|
{
|
|
struct collect_conn *tc = (struct collect_conn *)
|
|
((char *)c - offsetof(struct collect_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 collect_conn *tc = (struct collect_conn *)
|
|
((char *)c - offsetof(struct collect_conn, ruc_conn));
|
|
|
|
tc->forwarding = 0;
|
|
neighbor_timedout_etx(neighbor_find(to), retransmissions);
|
|
update_rtmetric(tc);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
adv_received(struct neighbor_discovery_conn *c, rimeaddr_t *from, uint16_t rtmetric)
|
|
{
|
|
struct collect_conn *tc = (struct collect_conn *)
|
|
((char *)c - offsetof(struct collect_conn, neighbor_discovery_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 neighbor_discovery_callbacks neighbor_discovery_callbacks =
|
|
{ adv_received, NULL};
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
collect_open(struct collect_conn *tc, u16_t channels,
|
|
const struct collect_callbacks *cb)
|
|
{
|
|
neighbor_discovery_open(&tc->neighbor_discovery_conn, channels,
|
|
&neighbor_discovery_callbacks);
|
|
ruc_open(&tc->ruc_conn, channels + 1, &ruc_callbacks);
|
|
tc->rtmetric = RTMETRIC_MAX;
|
|
tc->cb = cb;
|
|
neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
collect_close(struct collect_conn *tc)
|
|
{
|
|
neighbor_discovery_close(&tc->neighbor_discovery_conn);
|
|
ruc_close(&tc->ruc_conn);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
collect_set_sink(struct collect_conn *tc, int should_be_sink)
|
|
{
|
|
if(should_be_sink) {
|
|
tc->rtmetric = SINK;
|
|
neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
|
|
} else {
|
|
tc->rtmetric = RTMETRIC_MAX;
|
|
}
|
|
update_rtmetric(tc);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
collect_send(struct collect_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 = 1;
|
|
hdr->hoplim = MAX_HOPLIM;
|
|
hdr->rexmits = rexmits;
|
|
if(tc->rtmetric == 0) {
|
|
hdr->hops = 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
|
|
collect_depth(struct collect_conn *tc)
|
|
{
|
|
return tc->rtmetric;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/** @} */
|