nes-proj/core/net/rime/collect.c

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/* XXX: send explicit congestion notification if already forwarding
packet. */
/**
* \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 1.32 2010/02/08 21:59:49 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/collect.h"
#include "net/rime/packetqueue.h"
#include "dev/radio-sensor.h"
#if CONTIKI_TARGET_NETSIM
#include "ether.h"
#endif
#include <string.h>
#include <stdio.h>
#include <stddef.h>
static const struct packetbuf_attrlist attributes[] =
{
COLLECT_ATTRIBUTES
PACKETBUF_ATTR_LAST
};
#define NUM_RECENT_PACKETS 2
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 FORWARD_PACKET_LIFETIME (CLOCK_SECOND * 16)
#define MAX_FORWARDING_QUEUE 6
PACKETQUEUE(forwarding_queue, MAX_FORWARDING_QUEUE);
#define SINK 0
#define RTMETRIC_MAX COLLECT_MAX_DEPTH
#define MAX_HOPLIM 10
#ifndef COLLECT_CONF_ANNOUNCEMENTS
#define COLLECT_ANNOUNCEMENTS 1
#else
#define COLLECT_ANNOUNCEMENTS COLLECT_CONF_ANNOUNCEMENTS
#endif /* COLLECT_CONF_ANNOUNCEMENTS */
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
send_queued_packet(void)
{
struct queuebuf *q;
struct neighbor *n;
struct packetqueue_item *i;
struct collect_conn *c;
i = packetqueue_first(&forwarding_queue);
if(i == NULL) {
PRINTF("%d.%d: nothing on queue\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
/* No packet on the queue, so there is nothing for us to send. */
return;
}
c = packetqueue_ptr(i);
if(c == NULL) {
/* c should not be NULL, but we check it just to be sure. */
PRINTF("%d.%d: queue, c == NULL!\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
return;
}
if(c->forwarding) {
/* If we are currently forwarding a packet, we wait until the
packet is forwarded and try again then. */
PRINTF("%d.%d: queue, c is forwarding\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
return;
}
q = packetqueue_queuebuf(i);
if(q != NULL) {
PRINTF("%d.%d: queue, q is on queue\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
queuebuf_to_packetbuf(q);
n = neighbor_best();
/* Don't send to the neighbor if it is the same neighbor that sent
us the packet. */
if(n != NULL && !rimeaddr_cmp(&n->addr, packetbuf_addr(PACKETBUF_ADDR_SENDER))) {
#if CONTIKI_TARGET_NETSIM
ether_set_line(n->addr.u8[0], n->addr.u8[1]);
#endif /* CONTIKI_TARGET_NETSIM */
PRINTF("%d.%d: sending packet to %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1]);
c->forwarding = 1;
runicast_send(&c->runicast_conn, &n->addr, packetbuf_attr(PACKETBUF_ATTR_MAX_REXMIT));
} else {
PRINTF("%d.%d: did not find any neighbor to forward to\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
}
}
/*---------------------------------------------------------------------------*/
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",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
tc->rtmetric = RTMETRIC_MAX;
announcement_set_value(&tc->announcement, tc->rtmetric);
} 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) {
uint16_t old_rtmetric = tc->rtmetric;
tc->rtmetric = n->rtmetric + neighbor_etx(n);
#if !COLLECT_ANNOUNCEMENTS
neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
#else
announcement_set_value(&tc->announcement, tc->rtmetric);
#endif /* !COLLECT_ANNOUNCEMENTS */
PRINTF("%d.%d: new rtmetric %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
tc->rtmetric);
/* We got a new, working, route we send any queued packets we may have. */
if(old_rtmetric == RTMETRIC_MAX) {
send_queued_packet();
}
}
}
}
/* DEBUG_PRINTF("%d: new rtmetric %d\n", node_id, rtmetric);*/
#if CONTIKI_TARGET_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 runicast_conn *c, const rimeaddr_t *from,
uint8_t seqno)
{
struct collect_conn *tc = (struct collect_conn *)
((char *)c - offsetof(struct collect_conn, runicast_conn));
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 == packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID) &&
rimeaddr_cmp(&recent_packets[i].originator,
packetbuf_addr(PACKETBUF_ADDR_ESENDER))) {
PRINTF("%d.%d: dropping duplicate packet from %d.%d with seqno %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
recent_packets[i].originator.u8[0], recent_packets[i].originator.u8[1],
packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID));
/* Drop the packet. */
return;
}
}
recent_packets[recent_packet_ptr].seqno = packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID);
rimeaddr_copy(&recent_packets[recent_packet_ptr].originator,
packetbuf_addr(PACKETBUF_ADDR_ESENDER));
recent_packet_ptr = (recent_packet_ptr + 1) % NUM_RECENT_PACKETS;
if(tc->rtmetric == SINK) {
/* If we are the sink, we call the receive function. */
PRINTF("%d.%d: sink received packet from %d.%d via %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
packetbuf_addr(PACKETBUF_ADDR_ESENDER)->u8[0],
packetbuf_addr(PACKETBUF_ADDR_ESENDER)->u8[1],
from->u8[0], from->u8[1]);
if(tc->cb->recv != NULL) {
tc->cb->recv(packetbuf_addr(PACKETBUF_ADDR_ESENDER),
packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID),
packetbuf_attr(PACKETBUF_ATTR_HOPS));
}
return;
} else if(packetbuf_attr(PACKETBUF_ATTR_TTL) > 1 &&
tc->rtmetric != RTMETRIC_MAX) {
/* If we are not the sink, we forward the packet to the best
neighbor. */
packetbuf_set_attr(PACKETBUF_ATTR_HOPS, packetbuf_attr(PACKETBUF_ATTR_HOPS) + 1);
packetbuf_set_attr(PACKETBUF_ATTR_TTL, packetbuf_attr(PACKETBUF_ATTR_TTL) - 1);
PRINTF("%d.%d: packet received from %d.%d via %d.%d, forwarding %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
packetbuf_addr(PACKETBUF_ADDR_ESENDER)->u8[0],
packetbuf_addr(PACKETBUF_ADDR_ESENDER)->u8[1],
from->u8[0], from->u8[1], tc->forwarding);
if(packetqueue_enqueue_packetbuf(&forwarding_queue, FORWARD_PACKET_LIFETIME,
tc)) {
send_queued_packet();
} else {
PRINTF("%d.%d: packet dropped: no queue buffer available\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
}
return;
}
/*---------------------------------------------------------------------------*/
static void
node_packet_sent(struct runicast_conn *c, const rimeaddr_t *to,
uint8_t transmissions)
{
struct collect_conn *tc = (struct collect_conn *)
((char *)c - offsetof(struct collect_conn, runicast_conn));
PRINTF("%d.%d: sent to %d.%d after %d retransmissions\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
to->u8[0], to->u8[1],
transmissions);
tc->forwarding = 0;
neighbor_update_etx(neighbor_find(to), transmissions);
update_rtmetric(tc);
/* Remove the first packet on the queue, the packet that was just sent. */
packetqueue_dequeue(&forwarding_queue);
/* Send the next packet in the queue, if any. */
send_queued_packet();
}
/*---------------------------------------------------------------------------*/
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static void
node_packet_timedout(struct runicast_conn *c, const rimeaddr_t *to,
uint8_t transmissions)
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{
struct collect_conn *tc = (struct collect_conn *)
((char *)c - offsetof(struct collect_conn, runicast_conn));
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PRINTF("%d.%d: timedout after %d retransmissions: packet dropped\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1], transmissions);
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tc->forwarding = 0;
neighbor_timedout_etx(neighbor_find(to), transmissions);
update_rtmetric(tc);
/* Remove the first packet on the queue, the packet that just timed out. */
packetqueue_dequeue(&forwarding_queue);
/* Send the next packet in the queue, if any. */
send_queued_packet();
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}
/*---------------------------------------------------------------------------*/
#if !COLLECT_ANNOUNCEMENTS
static void
adv_received(struct neighbor_discovery_conn *c, const 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\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1], rtmetric);
}
update_rtmetric(tc);
}
#else
static void
received_announcement(struct announcement *a, const rimeaddr_t *from,
uint16_t id, uint16_t value)
{
struct collect_conn *tc = (struct collect_conn *)
((char *)a - offsetof(struct collect_conn, announcement));
struct neighbor *n;
n = neighbor_find(from);
if(n == NULL) {
neighbor_add(from, value, 1);
PRINTF("%d.%d: new neighbor %d.%d, etx %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1], value);
} else {
neighbor_update(n, value);
PRINTF("%d.%d: updating neighbor %d.%d, etx %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1], value);
}
update_rtmetric(tc);
}
#endif /* !COLLECT_ANNOUNCEMENTS */
/*---------------------------------------------------------------------------*/
static const struct runicast_callbacks runicast_callbacks = {node_packet_received,
node_packet_sent,
node_packet_timedout};
#if !COLLECT_ANNOUNCEMENTS
static const struct neighbor_discovery_callbacks neighbor_discovery_callbacks =
{ adv_received, NULL};
#endif /* !COLLECT_ANNOUNCEMENTS */
/*---------------------------------------------------------------------------*/
void
collect_open(struct collect_conn *tc, uint16_t channels,
const struct collect_callbacks *cb)
{
#if !COLLECT_ANNOUNCEMENTS
neighbor_discovery_open(&tc->neighbor_discovery_conn, channels,
CLOCK_SECOND * 2,
CLOCK_SECOND * 10,
CLOCK_SECOND * 60,
&neighbor_discovery_callbacks);
#endif /* !COLLECT_ANNOUNCEMENTS */
runicast_open(&tc->runicast_conn, channels + 1, &runicast_callbacks);
channel_set_attributes(channels + 1, attributes);
tc->rtmetric = RTMETRIC_MAX;
tc->cb = cb;
#if COLLECT_ANNOUNCEMENTS
announcement_register(&tc->announcement, channels, tc->rtmetric,
received_announcement);
announcement_listen(2);
#else
neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
#endif /* COLLECT_ANNOUNCEMENTS */
neighbor_init();
}
/*---------------------------------------------------------------------------*/
void
collect_close(struct collect_conn *tc)
{
#if COLLECT_ANNOUNCEMENTS
announcement_remove(&tc->announcement);
#else
neighbor_discovery_close(&tc->neighbor_discovery_conn);
#endif /* COLLECT_ANNOUNCEMENTS */
runicast_close(&tc->runicast_conn);
}
/*---------------------------------------------------------------------------*/
void
collect_set_sink(struct collect_conn *tc, int should_be_sink)
{
if(should_be_sink) {
tc->rtmetric = SINK;
#if !COLLECT_ANNOUNCEMENTS
neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
#endif /* !COLLECT_ANNOUNCEMENTS */
} else {
tc->rtmetric = RTMETRIC_MAX;
}
#if COLLECT_ANNOUNCEMENTS
announcement_set_value(&tc->announcement, tc->rtmetric);
#endif /* COLLECT_ANNOUNCEMENTS */
update_rtmetric(tc);
}
/*---------------------------------------------------------------------------*/
int
collect_send(struct collect_conn *tc, int rexmits)
{
struct neighbor *n;
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packetbuf_set_attr(PACKETBUF_ATTR_EPACKET_ID, tc->seqno++);
packetbuf_set_addr(PACKETBUF_ADDR_ESENDER, &rimeaddr_node_addr);
packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 1);
packetbuf_set_attr(PACKETBUF_ATTR_TTL, MAX_HOPLIM);
packetbuf_set_attr(PACKETBUF_ATTR_MAX_REXMIT, rexmits);
if(tc->rtmetric == SINK) {
packetbuf_set_attr(PACKETBUF_ATTR_HOPS, 0);
if(tc->cb->recv != NULL) {
tc->cb->recv(packetbuf_addr(PACKETBUF_ADDR_ESENDER),
packetbuf_attr(PACKETBUF_ATTR_EPACKET_ID),
packetbuf_attr(PACKETBUF_ATTR_HOPS));
}
return 1;
} else {
n = neighbor_best();
if(n != NULL) {
#if CONTIKI_TARGET_NETSIM
ether_set_line(n->addr.u8[0], n->addr.u8[1]);
#endif /* CONTIKI_TARGET_NETSIM */
PRINTF("%d.%d: sending to %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
n->addr.u8[0], n->addr.u8[1]);
if(packetqueue_enqueue_packetbuf(&forwarding_queue, FORWARD_PACKET_LIFETIME,
tc)) {
send_queued_packet();
return 1;
} else {
PRINTF("%d.%d: drop originated packet: no queuebuf\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
} 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]);
announcement_listen(1);
if(packetqueue_enqueue_packetbuf(&forwarding_queue, FORWARD_PACKET_LIFETIME,
tc)) {
return 1;
} else {
PRINTF("%d.%d: drop originated packet: no queuebuf\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
}
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
int
collect_depth(struct collect_conn *tc)
{
return tc->rtmetric;
}
/*---------------------------------------------------------------------------*/
/** @} */