212 lines
7.7 KiB
C
212 lines
7.7 KiB
C
/*
|
|
* 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: a slotframe dedicated to unicast data transmission.
|
|
* If sender-based:
|
|
* Nodes listen at a timeslot defined as hash(MAC) % ORCHESTRA_SB_UNICAST_PERIOD
|
|
* Nodes transmit at: for each nbr in RPL children and RPL preferred parent,
|
|
* hash(nbr.MAC) % ORCHESTRA_SB_UNICAST_PERIOD
|
|
* If receiver-based: the opposite
|
|
*
|
|
* \author Simon Duquennoy <simonduq@sics.se>
|
|
*/
|
|
|
|
#include "contiki.h"
|
|
#include "orchestra.h"
|
|
#include "net/ipv6/uip-ds6-route.h"
|
|
#include "net/packetbuf.h"
|
|
|
|
#if ORCHESTRA_UNICAST_SENDER_BASED && ORCHESTRA_COLLISION_FREE_HASH
|
|
#define UNICAST_SLOT_SHARED_FLAG ((ORCHESTRA_UNICAST_PERIOD < (ORCHESTRA_MAX_HASH + 1)) ? LINK_OPTION_SHARED : 0)
|
|
#else
|
|
#define UNICAST_SLOT_SHARED_FLAG LINK_OPTION_SHARED
|
|
#endif
|
|
|
|
static uint16_t slotframe_handle = 0;
|
|
static uint16_t channel_offset = 0;
|
|
static struct tsch_slotframe *sf_unicast;
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static uint16_t
|
|
get_node_timeslot(const linkaddr_t *addr)
|
|
{
|
|
if(addr != NULL && ORCHESTRA_UNICAST_PERIOD > 0) {
|
|
return ORCHESTRA_LINKADDR_HASH(addr) % ORCHESTRA_UNICAST_PERIOD;
|
|
} else {
|
|
return 0xffff;
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
neighbor_has_uc_link(const linkaddr_t *linkaddr)
|
|
{
|
|
if(linkaddr != NULL && !linkaddr_cmp(linkaddr, &linkaddr_null)) {
|
|
if((orchestra_parent_knows_us || !ORCHESTRA_UNICAST_SENDER_BASED)
|
|
&& linkaddr_cmp(&orchestra_parent_linkaddr, linkaddr)) {
|
|
return 1;
|
|
}
|
|
if(nbr_table_get_from_lladdr(nbr_routes, (linkaddr_t *)linkaddr) != NULL) {
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
add_uc_link(const linkaddr_t *linkaddr)
|
|
{
|
|
if(linkaddr != NULL) {
|
|
uint16_t timeslot = get_node_timeslot(linkaddr);
|
|
uint8_t link_options = ORCHESTRA_UNICAST_SENDER_BASED ? LINK_OPTION_RX : LINK_OPTION_TX | UNICAST_SLOT_SHARED_FLAG;
|
|
|
|
if(timeslot == get_node_timeslot(&linkaddr_node_addr)) {
|
|
/* This is also our timeslot, add necessary flags */
|
|
link_options |= ORCHESTRA_UNICAST_SENDER_BASED ? LINK_OPTION_TX | UNICAST_SLOT_SHARED_FLAG: LINK_OPTION_RX;
|
|
}
|
|
|
|
/* Add/update link */
|
|
tsch_schedule_add_link(sf_unicast, link_options, LINK_TYPE_NORMAL, &tsch_broadcast_address,
|
|
timeslot, channel_offset);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
remove_uc_link(const linkaddr_t *linkaddr)
|
|
{
|
|
uint16_t timeslot;
|
|
struct tsch_link *l;
|
|
|
|
if(linkaddr == NULL) {
|
|
return;
|
|
}
|
|
|
|
timeslot = get_node_timeslot(linkaddr);
|
|
l = tsch_schedule_get_link_by_timeslot(sf_unicast, timeslot);
|
|
if(l == NULL) {
|
|
return;
|
|
}
|
|
/* Does our current parent need this timeslot? */
|
|
if(timeslot == get_node_timeslot(&orchestra_parent_linkaddr)) {
|
|
/* Yes, this timeslot is being used, return */
|
|
return;
|
|
}
|
|
/* Does any other child need this timeslot?
|
|
* (lookup all route next hops) */
|
|
nbr_table_item_t *item = nbr_table_head(nbr_routes);
|
|
while(item != NULL) {
|
|
linkaddr_t *addr = nbr_table_get_lladdr(nbr_routes, item);
|
|
if(timeslot == get_node_timeslot(addr)) {
|
|
/* Yes, this timeslot is being used, return */
|
|
return;
|
|
}
|
|
item = nbr_table_next(nbr_routes, item);
|
|
}
|
|
|
|
/* Do we need this timeslot? */
|
|
if(timeslot == get_node_timeslot(&linkaddr_node_addr)) {
|
|
/* This is our link, keep it but update the link options */
|
|
uint8_t link_options = ORCHESTRA_UNICAST_SENDER_BASED ? LINK_OPTION_TX | UNICAST_SLOT_SHARED_FLAG: LINK_OPTION_RX;
|
|
tsch_schedule_add_link(sf_unicast, link_options, LINK_TYPE_NORMAL, &tsch_broadcast_address,
|
|
timeslot, channel_offset);
|
|
} else {
|
|
/* Remove link */
|
|
tsch_schedule_remove_link(sf_unicast, l);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
child_added(const linkaddr_t *linkaddr)
|
|
{
|
|
add_uc_link(linkaddr);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
child_removed(const linkaddr_t *linkaddr)
|
|
{
|
|
remove_uc_link(linkaddr);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
select_packet(uint16_t *slotframe, uint16_t *timeslot)
|
|
{
|
|
/* Select data packets we have a unicast link to */
|
|
const linkaddr_t *dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
|
|
if(packetbuf_attr(PACKETBUF_ATTR_FRAME_TYPE) == FRAME802154_DATAFRAME
|
|
&& neighbor_has_uc_link(dest)) {
|
|
if(slotframe != NULL) {
|
|
*slotframe = slotframe_handle;
|
|
}
|
|
if(timeslot != NULL) {
|
|
*timeslot = ORCHESTRA_UNICAST_SENDER_BASED ? get_node_timeslot(&linkaddr_node_addr) : get_node_timeslot(dest);
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
new_time_source(const struct tsch_neighbor *old, const struct tsch_neighbor *new)
|
|
{
|
|
if(new != old) {
|
|
const linkaddr_t *old_addr = old != NULL ? &old->addr : NULL;
|
|
const linkaddr_t *new_addr = new != NULL ? &new->addr : NULL;
|
|
if(new_addr != NULL) {
|
|
linkaddr_copy(&orchestra_parent_linkaddr, new_addr);
|
|
} else {
|
|
linkaddr_copy(&orchestra_parent_linkaddr, &linkaddr_null);
|
|
}
|
|
remove_uc_link(old_addr);
|
|
add_uc_link(new_addr);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
init(uint16_t sf_handle)
|
|
{
|
|
slotframe_handle = sf_handle;
|
|
channel_offset = sf_handle;
|
|
/* Slotframe for unicast transmissions */
|
|
sf_unicast = tsch_schedule_add_slotframe(slotframe_handle, ORCHESTRA_UNICAST_PERIOD);
|
|
uint16_t timeslot = get_node_timeslot(&linkaddr_node_addr);
|
|
tsch_schedule_add_link(sf_unicast,
|
|
ORCHESTRA_UNICAST_SENDER_BASED ? LINK_OPTION_TX | UNICAST_SLOT_SHARED_FLAG: LINK_OPTION_RX,
|
|
LINK_TYPE_NORMAL, &tsch_broadcast_address,
|
|
timeslot, channel_offset);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
struct orchestra_rule unicast_per_neighbor = {
|
|
init,
|
|
new_time_source,
|
|
select_packet,
|
|
child_added,
|
|
child_removed,
|
|
};
|