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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: a slotframe dedicated to unicast data transmission. Designed for
* RPL storing mode only, as this is based on the knowledge of the children (and parent).
* If receiver-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 sender-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"
#include "net/rpl/rpl-conf.h"
#include "net/rpl/rpl-private.h"
/*
* The body of this rule should be compiled only when "nbr_routes" is available,
* otherwise a link error causes build failure. "nbr_routes" is compiled if
* UIP_CONF_MAX_ROUTES != 0. See uip-ds6-route.c.
*/
#if UIP_CONF_MAX_ROUTES != 0
#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_rpl_storing = {
init,
new_time_source,
select_packet,
child_added,
child_removed,
};
#endif /* UIP_MAX_ROUTES */
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