Implementation of the Trickle multicast engine
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George Oikonomou
George Oikonomou
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6f3a1eb032
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1435
core/net/ipv6/multicast/roll-tm.c
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core/net/ipv6/multicast/roll-tm.c
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core/net/ipv6/multicast/roll-tm.h
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core/net/ipv6/multicast/roll-tm.h
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/*
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* Copyright (c) 2011, Loughborough University - 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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/**
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* \file
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* Header file for IPv6 multicast according to the algorithm in the
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* "MCAST Forwarding Using Trickle" internet draft.
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*
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* The current version of the draft can always be found in
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* http://tools.ietf.org/html/draft-ietf-roll-trickle-mcast
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*
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* This implementation is based on the draft version stored in
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* ROLL_TM_VER.
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*
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* In draft v2, the document was renamed to
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* "Multicast Protocol for Low power and Lossy Networks (MPL)"
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* Due to very significant changes between draft versions 1 and 2,
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* MPL will be implemented as a separate engine and this file here
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* will provide legacy support for Draft v1.
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#ifndef ROLL_TM_H_
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#define ROLL_TM_H_
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#include "contiki-conf.h"
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#include <stdint.h>
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/*---------------------------------------------------------------------------*/
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/* Protocol Constants */
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/*---------------------------------------------------------------------------*/
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#define ROLL_TM_VER 1 /* Supported Draft Version */
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#define ROLL_TM_ICMP_CODE 0 /* ICMPv6 code field */
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#define ROLL_TM_IP_HOP_LIMIT 0xFF /* Hop limit for ICMP messages */
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#define ROLL_TM_INFINITE_REDUNDANCY 0xFF
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#define ROLL_TM_DGRAM_OUT 0
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#define ROLL_TM_DGRAM_IN 1
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/*
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* The draft does not currently specify a default number for the trickle
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* interval nor a way to derive it. Examples however hint at 100 msec.
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*
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* In draft terminology, we use an 'aggressive' policy (M=0) and a conservative
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* one (M=1).
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*
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* When experimenting with the two policies on the sky platform,
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* an interval of 125ms proves to be way too low: When we have traffic,
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* doublings happen after the interval end and periodics fire after point T
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* within the interval (and sometimes even after interval end). When traffic
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* settles down, the code compensates the offsets.
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*
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* We consider 125, 250ms etc because they are nice divisors of 1 sec
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* (quotient is power of two). For some machines (e.g sky/msp430,
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* sensinode/cc243x), this is also a nice number of clock ticks
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*
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* After experimentation, the values of Imin leading to best performance are:
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* ContikiMAC: Imin=64 (500ms)
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* Null RDC: imin=16 (125ms)
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*/
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/* Configuration for Timer with M=0 (aggressive) */
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#ifdef ROLL_TM_CONF_IMIN_0
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#define ROLL_TM_IMIN_0 ROLL_TM_CONF_IMIN_0
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#else
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#define ROLL_TM_IMIN_0 32 /* 250 msec */
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#endif
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#ifdef ROLL_TM_CONF_IMAX_0
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#define ROLL_TM_IMAX_0 ROLL_TM_CONF_IMAX_0
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#else
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#define ROLL_TM_IMAX_0 1 /* Imax = 500ms */
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#endif
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#ifdef ROLL_TM_CONF_K_0
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#define ROLL_TM_K_0 ROLL_TM_CONF_K_0
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#else
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#define ROLL_TM_K_0 ROLL_TM_INFINITE_REDUNDANCY
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#endif
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#ifdef ROLL_TM_CONF_T_ACTIVE_0
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#define ROLL_TM_T_ACTIVE_0 ROLL_TM_CONF_T_ACTIVE_0
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#else
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#define ROLL_TM_T_ACTIVE_0 3
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#endif
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#ifdef ROLL_TM_CONF_T_DWELL_0
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#define ROLL_TM_T_DWELL_0 ROLL_TM_CONF_T_DWELL_0
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#else
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#define ROLL_TM_T_DWELL_0 11
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#endif
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/* Configuration for Timer with M=1 (conservative) */
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#ifdef ROLL_TM_CONF_IMIN_1
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#define ROLL_TM_IMIN_1 ROLL_TM_CONF_IMIN_1
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#else
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#define ROLL_TM_IMIN_1 64 /* 500 msec */
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#endif
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#ifdef ROLL_TM_CONF_IMAX_1
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#define ROLL_TM_IMAX_1 ROLL_TM_CONF_IMAX_1
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#else
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#define ROLL_TM_IMAX_1 9 /* Imax = 256 secs */
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#endif
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#ifdef ROLL_TM_CONF_K_1
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#define ROLL_TM_K_1 ROLL_TM_CONF_K_1
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#else
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#define ROLL_TM_K_1 1
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#endif
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#ifdef ROLL_TM_CONF_T_ACTIVE_1
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#define ROLL_TM_T_ACTIVE_1 ROLL_TM_CONF_T_ACTIVE_1
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#else
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#define ROLL_TM_T_ACTIVE_1 3
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#endif
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#ifdef ROLL_TM_CONF_T_DWELL_1
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#define ROLL_TM_T_DWELL_1 ROLL_TM_CONF_T_DWELL_1
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#else
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#define ROLL_TM_T_DWELL_1 12
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#endif
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/*---------------------------------------------------------------------------*/
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/* Configuration */
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/*---------------------------------------------------------------------------*/
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/*
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* Number of Sliding Windows
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* In essence: How many unique sources of simultaneous multicast traffic do we
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* want to support for our lowpan
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* If a node is seeding two multicast streams, parametrized on different M
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* values, then this seed will occupy two different sliding windows
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*/
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#ifdef ROLL_TM_CONF_WINS
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#define ROLL_TM_WINS ROLL_TM_CONF_WINS
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#else
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#define ROLL_TM_WINS 2
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#endif
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/*---------------------------------------------------------------------------*/
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/*
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* Maximum Number of Buffered Multicast Messages
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* This buffer is shared across all Seed IDs, therefore a new very active Seed
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* may eventually occupy all slots. It would make little sense (if any) to
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* define support for fewer buffered messages than seeds*2
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*/
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#ifdef ROLL_TM_CONF_BUFF_NUM
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#define ROLL_TM_BUFF_NUM ROLL_TM_CONF_BUFF_NUM
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#else
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#define ROLL_TM_BUFF_NUM 6
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#endif
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/*---------------------------------------------------------------------------*/
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/*
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* Use Short Seed IDs [short: 2, long: 16 (default)]
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* It can be argued that we should (and it would be easy to) support both at
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* the same time but the draft doesn't list this as a MUST so we opt for
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* code/ram savings
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*/
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#ifdef ROLL_TM_CONF_SHORT_SEEDS
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#define ROLL_TM_SHORT_SEEDS ROLL_TM_CONF_SHORT_SEEDS
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#else
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#define ROLL_TM_SHORT_SEEDS 0
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#endif
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/*---------------------------------------------------------------------------*/
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/*
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* Destination address for our ICMPv6 advertisements. The draft gives us a
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* choice between LL all-nodes or LL all-routers
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*
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* We use allrouters unless a conf directive chooses otherwise
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*/
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#ifdef ROLL_TM_CONF_DEST_ALL_NODES
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#define ROLL_TM_DEST_ALL_NODES ROLL_TM_CONF_DEST_ALL_NODES
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#else
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#define ROLL_TM_DEST_ALL_NODES 0
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#endif
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/*---------------------------------------------------------------------------*/
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/*
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* M param for our outgoing messages
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* By default, we set the M bit (conservative). Define this as 0 to clear the
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* M bit in our outgoing messages (aggressive)
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*/
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#ifdef ROLL_TM_CONF_SET_M_BIT
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#define ROLL_TM_SET_M_BIT ROLL_TM_CONF_SET_M_BIT
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#else
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#define ROLL_TM_SET_M_BIT 1
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#endif
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/*---------------------------------------------------------------------------*/
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/* Prototypes of additional Trickle Multicast functions */
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Called by the uIPv6 engine when it receives a Trickle Multicast
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* ICMPv6 datagram
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*/
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void roll_tm_icmp_input();
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/*---------------------------------------------------------------------------*/
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/* Stats datatype */
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/*---------------------------------------------------------------------------*/
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struct roll_tm_stats {
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uint16_t mcast_in_unique;
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uint16_t mcast_in_all; /* At layer 3 */
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uint16_t mcast_in_ours; /* Unique and we are a group member */
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uint16_t mcast_fwd; /* Forwarded by us but we are not the seed */
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uint16_t mcast_out; /* We are the seed */
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uint16_t mcast_bad;
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uint16_t mcast_dropped;
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uint16_t icmp_in;
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uint16_t icmp_out;
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uint16_t icmp_bad;
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};
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#endif /* ROLL_TM_H_ */
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