120 lines
4.5 KiB
C
120 lines
4.5 KiB
C
/*
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* Copyright (c) 2016, Inria.
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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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*/
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/**
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* \file
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* Orchestra: a slotframe dedicated to unicast data transmission. Designed primarily
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* for RPL non-storing mode but would work with any mode-of-operation. Does not require
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* any knowledge of the children. Works only as received-base, and as follows:
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* Nodes listen at a timeslot defined as hash(MAC) % ORCHESTRA_SB_UNICAST_PERIOD
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* Nodes transmit at: for any neighbor, hash(nbr.MAC) % ORCHESTRA_SB_UNICAST_PERIOD
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*
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* \author Simon Duquennoy <simon.duquennoy@inria.fr>
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*/
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#include "contiki.h"
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#include "orchestra.h"
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#include "net/ipv6/uip-ds6-route.h"
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#include "net/packetbuf.h"
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static uint16_t slotframe_handle = 0;
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static uint16_t channel_offset = 0;
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static struct tsch_slotframe *sf_unicast;
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/*---------------------------------------------------------------------------*/
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static uint16_t
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get_node_timeslot(const linkaddr_t *addr)
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{
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if(addr != NULL && ORCHESTRA_UNICAST_PERIOD > 0) {
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return ORCHESTRA_LINKADDR_HASH(addr) % ORCHESTRA_UNICAST_PERIOD;
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} else {
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return 0xffff;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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child_added(const linkaddr_t *linkaddr)
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{
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}
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/*---------------------------------------------------------------------------*/
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static void
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child_removed(const linkaddr_t *linkaddr)
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{
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}
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/*---------------------------------------------------------------------------*/
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static int
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select_packet(uint16_t *slotframe, uint16_t *timeslot)
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{
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/* Select data packets we have a unicast link to */
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const linkaddr_t *dest = packetbuf_addr(PACKETBUF_ADDR_RECEIVER);
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if(packetbuf_attr(PACKETBUF_ATTR_FRAME_TYPE) == FRAME802154_DATAFRAME
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&& !linkaddr_cmp(dest, &linkaddr_null)) {
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if(slotframe != NULL) {
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*slotframe = slotframe_handle;
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}
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if(timeslot != NULL) {
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*timeslot = get_node_timeslot(dest);
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}
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return 1;
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}
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static void
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new_time_source(const struct tsch_neighbor *old, const struct tsch_neighbor *new)
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{
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}
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/*---------------------------------------------------------------------------*/
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static void
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init(uint16_t sf_handle)
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{
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int i;
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uint16_t rx_timeslot;
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slotframe_handle = sf_handle;
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channel_offset = sf_handle;
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/* Slotframe for unicast transmissions */
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sf_unicast = tsch_schedule_add_slotframe(slotframe_handle, ORCHESTRA_UNICAST_PERIOD);
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rx_timeslot = get_node_timeslot(&linkaddr_node_addr);
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/* Add a Tx link at each available timeslot. Make the link Rx at our own timeslot. */
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for(i = 0; i < ORCHESTRA_UNICAST_PERIOD; i++) {
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tsch_schedule_add_link(sf_unicast,
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LINK_OPTION_SHARED | LINK_OPTION_TX | ( i == rx_timeslot ? LINK_OPTION_RX : 0 ),
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LINK_TYPE_NORMAL, &tsch_broadcast_address,
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i, channel_offset);
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}
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}
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/*---------------------------------------------------------------------------*/
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struct orchestra_rule unicast_per_neighbor_rpl_ns = {
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init,
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new_time_source,
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select_packet,
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child_added,
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child_removed,
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};
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