346 lines
10 KiB
C
346 lines
10 KiB
C
/* XXX: send explicit congestion notification if already forwarding
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packet + add queue for keeping packets to forward. */
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/**
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* \addtogroup rimecollect
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* @{
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*/
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/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: collect.c,v 1.8 2008/02/24 22:05:27 adamdunkels Exp $
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*/
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/**
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* \file
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* Tree-based hop-by-hop reliable data collection
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "contiki.h"
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#include "net/rime.h"
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#include "net/rime/neighbor.h"
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#include "net/rime/nf.h"
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#include "net/rime/collect.h"
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#include "dev/radio-sensor.h"
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#if NETSIM
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#include "ether.h"
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#endif
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#include <string.h>
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#include <stdio.h>
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#include <stddef.h>
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struct hdr {
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rimeaddr_t originator;
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uint8_t originator_seqno;
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uint8_t hops;
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uint8_t hoplim;
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uint8_t rexmits;
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};
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#define NUM_RECENT_PACKETS 4
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struct recent_packet {
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rimeaddr_t originator;
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uint8_t seqno;
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};
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static struct recent_packet recent_packets[NUM_RECENT_PACKETS];
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static uint8_t recent_packet_ptr;
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#define SINK 0
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#define RTMETRIC_MAX COLLECT_MAX_DEPTH
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#define MAX_HOPLIM 10
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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/*---------------------------------------------------------------------------*/
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static void
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update_rtmetric(struct collect_conn *tc)
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{
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struct neighbor *n;
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/* We should only update the rtmetric if we are not the sink. */
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if(tc->rtmetric != SINK) {
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/* Find the neighbor with the lowest rtmetric. */
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n = neighbor_best();
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/* If n is NULL, we have no best neighbor. */
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if(n == NULL) {
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/* If we have don't have any neighbors, we set our rtmetric to
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the maximum value to indicate that we do not have a route. */
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if(tc->rtmetric != RTMETRIC_MAX) {
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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]);
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}
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tc->rtmetric = RTMETRIC_MAX;
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} else {
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/* We set our rtmetric to the rtmetric of our best neighbor plus
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the expected transmissions to reach that neighbor. */
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if(n->rtmetric + neighbor_etx(n) != tc->rtmetric) {
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tc->rtmetric = n->rtmetric + neighbor_etx(n);
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neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
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PRINTF("%d.%d: new rtmetric %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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tc->rtmetric);
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}
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}
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}
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/* DEBUG_PRINTF("%d: new rtmetric %d\n", node_id, rtmetric);*/
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#if NETSIM
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{
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char buf[8];
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if(tc->rtmetric == RTMETRIC_MAX) {
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strcpy(buf, " ");
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} else {
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sprintf(buf, "%.1f", (float)tc->rtmetric / NEIGHBOR_ETX_SCALE);
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}
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ether_set_text(buf);
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}
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#endif
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}
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/*---------------------------------------------------------------------------*/
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static void
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node_packet_received(struct ruc_conn *c, rimeaddr_t *from, uint8_t seqno)
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{
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struct collect_conn *tc = (struct collect_conn *)
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((char *)c - offsetof(struct collect_conn, ruc_conn));
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struct hdr *hdr = rimebuf_dataptr();
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struct neighbor *n;
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int i;
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/* To protect against forwarding duplicate packets, we keep a list
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of recently forwarded packet seqnos. If the seqno of the current
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packet exists in the list, we drop the packet. */
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for(i = 0; i < NUM_RECENT_PACKETS; i++) {
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if(recent_packets[i].seqno == hdr->originator_seqno &&
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rimeaddr_cmp(&recent_packets[i].originator, &hdr->originator)) {
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/* Drop the packet. */
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return;
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}
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}
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recent_packets[recent_packet_ptr].seqno = hdr->originator_seqno;
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rimeaddr_copy(&recent_packets[recent_packet_ptr].originator, &hdr->originator);
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recent_packet_ptr = (recent_packet_ptr + 1) % NUM_RECENT_PACKETS;
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if(tc->rtmetric == SINK) {
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/* If we are the sink, we call the receive function. */
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rimebuf_hdrreduce(sizeof(struct hdr));
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PRINTF("%d.%d: sink received packet from %d.%d via %d.%d with rtmetric %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->originator.u8[0], hdr->originator.u8[1],
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from->u8[0], from->u8[1], hdr->rtmetric);
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if(tc->cb->recv != NULL) {
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tc->cb->recv(&hdr->originator, hdr->originator_seqno,
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hdr->hops);
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}
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return;
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} else if(hdr->hoplim > 1 && tc->rtmetric != RTMETRIC_MAX) {
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/* If we are not the sink, we forward the packet to the best
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neighbor. */
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hdr->hops++;
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hdr->hoplim--;
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PRINTF("%d.%d: packet received from %d.%d via %d.%d with rtmetric %d, best neighbor %p, forwarding %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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hdr->originator.u8[0], hdr->originator.u8[1],
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from->u8[0], from->u8[1], hdr->rtmetric,
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neighbor_best(), tc->forwarding);
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if(!tc->forwarding) {
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tc->forwarding = 1;
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n = neighbor_best();
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if(n != NULL) {
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#if NETSIM
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ether_set_line(n->addr.u8[0], n->addr.u8[1]);
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#endif /* NETSIM */
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ruc_send(c, &n->addr, hdr->rexmits);
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}
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return;
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} else {
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PRINTF("%d.%d: still forwarding another packet\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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return;
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}
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}
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return;
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}
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/*---------------------------------------------------------------------------*/
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static void
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node_packet_sent(struct ruc_conn *c, rimeaddr_t *to, uint8_t retransmissions)
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{
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struct collect_conn *tc = (struct collect_conn *)
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((char *)c - offsetof(struct collect_conn, ruc_conn));
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tc->forwarding = 0;
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neighbor_update_etx(neighbor_find(to), retransmissions);
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update_rtmetric(tc);
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}
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/*---------------------------------------------------------------------------*/
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static void
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node_packet_timedout(struct ruc_conn *c, rimeaddr_t *to, uint8_t retransmissions)
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{
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struct collect_conn *tc = (struct collect_conn *)
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((char *)c - offsetof(struct collect_conn, ruc_conn));
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tc->forwarding = 0;
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neighbor_timedout_etx(neighbor_find(to), retransmissions);
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update_rtmetric(tc);
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}
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/*---------------------------------------------------------------------------*/
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static void
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adv_received(struct neighbor_discovery_conn *c, rimeaddr_t *from, uint16_t rtmetric)
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{
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struct collect_conn *tc = (struct collect_conn *)
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((char *)c - offsetof(struct collect_conn, neighbor_discovery_conn));
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struct neighbor *n;
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n = neighbor_find(from);
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if(n == NULL) {
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neighbor_add(from, rtmetric, 1);
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} else {
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neighbor_update(n, rtmetric);
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PRINTF("%d.%d: updating neighbor %d.%d, etx %d, hops %d\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
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n->addr.u8[0], n->addr.u8[1],
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1, rtmetric);
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}
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update_rtmetric(tc);
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}
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/*---------------------------------------------------------------------------*/
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static const struct ruc_callbacks ruc_callbacks = {node_packet_received,
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node_packet_sent,
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node_packet_timedout};
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static const struct neighbor_discovery_callbacks neighbor_discovery_callbacks =
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{ adv_received, NULL};
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/*---------------------------------------------------------------------------*/
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void
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collect_open(struct collect_conn *tc, uint16_t channels,
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const struct collect_callbacks *cb)
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{
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neighbor_discovery_open(&tc->neighbor_discovery_conn, channels,
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&neighbor_discovery_callbacks);
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ruc_open(&tc->ruc_conn, channels + 1, &ruc_callbacks);
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tc->rtmetric = RTMETRIC_MAX;
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tc->cb = cb;
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neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
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}
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/*---------------------------------------------------------------------------*/
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void
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collect_close(struct collect_conn *tc)
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{
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neighbor_discovery_close(&tc->neighbor_discovery_conn);
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ruc_close(&tc->ruc_conn);
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}
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/*---------------------------------------------------------------------------*/
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void
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collect_set_sink(struct collect_conn *tc, int should_be_sink)
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{
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if(should_be_sink) {
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tc->rtmetric = SINK;
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neighbor_discovery_start(&tc->neighbor_discovery_conn, tc->rtmetric);
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} else {
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tc->rtmetric = RTMETRIC_MAX;
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}
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update_rtmetric(tc);
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}
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/*---------------------------------------------------------------------------*/
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void
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collect_send(struct collect_conn *tc, int rexmits)
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{
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struct neighbor *n;
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struct hdr *hdr;
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if(rimebuf_hdralloc(sizeof(struct hdr))) {
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hdr = rimebuf_hdrptr();
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hdr->originator_seqno = tc->seqno++;
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rimeaddr_copy(&hdr->originator, &rimeaddr_node_addr);
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hdr->hops = 1;
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hdr->hoplim = MAX_HOPLIM;
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hdr->rexmits = rexmits;
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if(tc->rtmetric == 0) {
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hdr->hops = 0;
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if(tc->cb->recv != NULL) {
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tc->cb->recv(&hdr->originator, hdr->originator_seqno,
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hdr->hops);
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}
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} else {
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n = neighbor_best();
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if(n != NULL) {
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/* printf("Sending to best neighbor\n");*/
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#if NETSIM
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ether_set_line(n->addr.u8[0], n->addr.u8[1]);
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#endif /* NETSIM */
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ruc_send(&tc->ruc_conn, &n->addr, rexmits);
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} else {
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/* printf("Didn't find any neighbor\n");*/
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PRINTF("%d.%d: did not find any neighbor to send to\n",
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rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
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}
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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int
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collect_depth(struct collect_conn *tc)
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{
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return tc->rtmetric;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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