nes-proj/os/services/orchestra/orchestra.c

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/*
* Copyright (c) 2015, 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.
*
*/
/**
* \file
* Orchestra: an autonomous scheduler for TSCH exploiting RPL state.
* See "Orchestra: Robust Mesh Networks Through Autonomously Scheduled TSCH", ACM SenSys'15
*
* \author Simon Duquennoy <simonduq@sics.se>
*/
#include "contiki.h"
#include "orchestra.h"
#include "net/packetbuf.h"
#include "net/ipv6/uip-icmp6.h"
#include "rpl.h"
#if UIP_CONF_IPV6_RPL_LITE == 0
#include "rpl-private.h"
#endif /* UIP_CONF_IPV6_RPL_LITE == 0 */
#define DEBUG DEBUG_PRINT
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#include "net/ipv6/uip-debug.h"
/* A net-layer sniffer for packets sent and received */
static void orchestra_packet_received(void);
static void orchestra_packet_sent(int mac_status);
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NETSTACK_SNIFFER(orchestra_sniffer, orchestra_packet_received, orchestra_packet_sent);
/* The current RPL preferred parent's link-layer address */
linkaddr_t orchestra_parent_linkaddr;
/* Set to one only after getting an ACK for a DAO sent to our preferred parent */
int orchestra_parent_knows_us = 0;
/* The set of Orchestra rules in use */
const struct orchestra_rule *all_rules[] = ORCHESTRA_RULES;
#define NUM_RULES (sizeof(all_rules) / sizeof(struct orchestra_rule *))
/*---------------------------------------------------------------------------*/
static void
orchestra_packet_received(void)
{
}
/*---------------------------------------------------------------------------*/
static void
orchestra_packet_sent(int mac_status)
{
/* Check if our parent just ACKed a DAO */
if(orchestra_parent_knows_us == 0
&& mac_status == MAC_TX_OK
&& packetbuf_attr(PACKETBUF_ATTR_NETWORK_ID) == UIP_PROTO_ICMP6
&& packetbuf_attr(PACKETBUF_ATTR_CHANNEL) == (ICMP6_RPL << 8 | RPL_CODE_DAO)) {
if(!linkaddr_cmp(&orchestra_parent_linkaddr, &linkaddr_null)
&& linkaddr_cmp(&orchestra_parent_linkaddr, packetbuf_addr(PACKETBUF_ADDR_RECEIVER))) {
orchestra_parent_knows_us = 1;
}
}
}
/*---------------------------------------------------------------------------*/
void
orchestra_callback_child_added(const linkaddr_t *addr)
{
/* Notify all Orchestra rules that a child was added */
int i;
for(i = 0; i < NUM_RULES; i++) {
if(all_rules[i]->child_added != NULL) {
all_rules[i]->child_added(addr);
}
}
}
/*---------------------------------------------------------------------------*/
void
orchestra_callback_child_removed(const linkaddr_t *addr)
{
/* Notify all Orchestra rules that a child was removed */
int i;
for(i = 0; i < NUM_RULES; i++) {
if(all_rules[i]->child_removed != NULL) {
all_rules[i]->child_removed(addr);
}
}
}
/*---------------------------------------------------------------------------*/
void
orchestra_callback_packet_ready(void)
{
int i;
/* By default, use any slotframe, any timeslot */
uint16_t slotframe = 9;
uint16_t timeslot = 0xffff;
/* Loop over all rules until finding one able to handle the packet */
for(i = 0; i < NUM_RULES; i++) {
if(all_rules[i]->select_packet != NULL) {
if(all_rules[i]->select_packet(&slotframe, &timeslot)) {
break;
}
}
}
#if TSCH_WITH_LINK_SELECTOR
packetbuf_set_attr(PACKETBUF_ATTR_TSCH_SLOTFRAME, slotframe);
packetbuf_set_attr(PACKETBUF_ATTR_TSCH_TIMESLOT, timeslot);
#endif
}
/*---------------------------------------------------------------------------*/
void
orchestra_callback_new_time_source(const struct tsch_neighbor *old, const struct tsch_neighbor *new)
{
/* Orchestra assumes that the time source is also the RPL parent.
* This is the case if the following is set:
* #define RPL_CALLBACK_PARENT_SWITCH tsch_rpl_callback_parent_switch
* */
int i;
if(new != old) {
orchestra_parent_knows_us = 0;
}
for(i = 0; i < NUM_RULES; i++) {
if(all_rules[i]->new_time_source != NULL) {
all_rules[i]->new_time_source(old, new);
}
}
}
/*---------------------------------------------------------------------------*/
void
orchestra_init(void)
{
int i;
/* Snoop on packet transmission to know if our parent knows about us
* (i.e. has ACKed at one of our DAOs since we decided to use it as a parent) */
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netstack_sniffer_add(&orchestra_sniffer);
linkaddr_copy(&orchestra_parent_linkaddr, &linkaddr_null);
/* Initialize all Orchestra rules */
for(i = 0; i < NUM_RULES; i++) {
if(all_rules[i]->init != NULL) {
PRINTF("Orchestra: initializing rule %u\n", i);
all_rules[i]->init(i);
}
}
PRINTF("Orchestra: initialization done\n");
}