Implementation of the Trickle multicast engine

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George Oikonomou 2011-11-11 12:06:35 +00:00 committed by George Oikonomou
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/*
* Copyright (c) 2011, Loughborough University - 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.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* Header file for IPv6 multicast according to the algorithm in the
* "MCAST Forwarding Using Trickle" internet draft.
*
* The current version of the draft can always be found in
* http://tools.ietf.org/html/draft-ietf-roll-trickle-mcast
*
* This implementation is based on the draft version stored in
* ROLL_TM_VER.
*
* In draft v2, the document was renamed to
* "Multicast Protocol for Low power and Lossy Networks (MPL)"
* Due to very significant changes between draft versions 1 and 2,
* MPL will be implemented as a separate engine and this file here
* will provide legacy support for Draft v1.
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#ifndef ROLL_TM_H_
#define ROLL_TM_H_
#include "contiki-conf.h"
#include <stdint.h>
/*---------------------------------------------------------------------------*/
/* Protocol Constants */
/*---------------------------------------------------------------------------*/
#define ROLL_TM_VER 1 /* Supported Draft Version */
#define ROLL_TM_ICMP_CODE 0 /* ICMPv6 code field */
#define ROLL_TM_IP_HOP_LIMIT 0xFF /* Hop limit for ICMP messages */
#define ROLL_TM_INFINITE_REDUNDANCY 0xFF
#define ROLL_TM_DGRAM_OUT 0
#define ROLL_TM_DGRAM_IN 1
/*
* The draft does not currently specify a default number for the trickle
* interval nor a way to derive it. Examples however hint at 100 msec.
*
* In draft terminology, we use an 'aggressive' policy (M=0) and a conservative
* one (M=1).
*
* When experimenting with the two policies on the sky platform,
* an interval of 125ms proves to be way too low: When we have traffic,
* doublings happen after the interval end and periodics fire after point T
* within the interval (and sometimes even after interval end). When traffic
* settles down, the code compensates the offsets.
*
* We consider 125, 250ms etc because they are nice divisors of 1 sec
* (quotient is power of two). For some machines (e.g sky/msp430,
* sensinode/cc243x), this is also a nice number of clock ticks
*
* After experimentation, the values of Imin leading to best performance are:
* ContikiMAC: Imin=64 (500ms)
* Null RDC: imin=16 (125ms)
*/
/* Configuration for Timer with M=0 (aggressive) */
#ifdef ROLL_TM_CONF_IMIN_0
#define ROLL_TM_IMIN_0 ROLL_TM_CONF_IMIN_0
#else
#define ROLL_TM_IMIN_0 32 /* 250 msec */
#endif
#ifdef ROLL_TM_CONF_IMAX_0
#define ROLL_TM_IMAX_0 ROLL_TM_CONF_IMAX_0
#else
#define ROLL_TM_IMAX_0 1 /* Imax = 500ms */
#endif
#ifdef ROLL_TM_CONF_K_0
#define ROLL_TM_K_0 ROLL_TM_CONF_K_0
#else
#define ROLL_TM_K_0 ROLL_TM_INFINITE_REDUNDANCY
#endif
#ifdef ROLL_TM_CONF_T_ACTIVE_0
#define ROLL_TM_T_ACTIVE_0 ROLL_TM_CONF_T_ACTIVE_0
#else
#define ROLL_TM_T_ACTIVE_0 3
#endif
#ifdef ROLL_TM_CONF_T_DWELL_0
#define ROLL_TM_T_DWELL_0 ROLL_TM_CONF_T_DWELL_0
#else
#define ROLL_TM_T_DWELL_0 11
#endif
/* Configuration for Timer with M=1 (conservative) */
#ifdef ROLL_TM_CONF_IMIN_1
#define ROLL_TM_IMIN_1 ROLL_TM_CONF_IMIN_1
#else
#define ROLL_TM_IMIN_1 64 /* 500 msec */
#endif
#ifdef ROLL_TM_CONF_IMAX_1
#define ROLL_TM_IMAX_1 ROLL_TM_CONF_IMAX_1
#else
#define ROLL_TM_IMAX_1 9 /* Imax = 256 secs */
#endif
#ifdef ROLL_TM_CONF_K_1
#define ROLL_TM_K_1 ROLL_TM_CONF_K_1
#else
#define ROLL_TM_K_1 1
#endif
#ifdef ROLL_TM_CONF_T_ACTIVE_1
#define ROLL_TM_T_ACTIVE_1 ROLL_TM_CONF_T_ACTIVE_1
#else
#define ROLL_TM_T_ACTIVE_1 3
#endif
#ifdef ROLL_TM_CONF_T_DWELL_1
#define ROLL_TM_T_DWELL_1 ROLL_TM_CONF_T_DWELL_1
#else
#define ROLL_TM_T_DWELL_1 12
#endif
/*---------------------------------------------------------------------------*/
/* Configuration */
/*---------------------------------------------------------------------------*/
/*
* Number of Sliding Windows
* In essence: How many unique sources of simultaneous multicast traffic do we
* want to support for our lowpan
* If a node is seeding two multicast streams, parametrized on different M
* values, then this seed will occupy two different sliding windows
*/
#ifdef ROLL_TM_CONF_WINS
#define ROLL_TM_WINS ROLL_TM_CONF_WINS
#else
#define ROLL_TM_WINS 2
#endif
/*---------------------------------------------------------------------------*/
/*
* Maximum Number of Buffered Multicast Messages
* This buffer is shared across all Seed IDs, therefore a new very active Seed
* may eventually occupy all slots. It would make little sense (if any) to
* define support for fewer buffered messages than seeds*2
*/
#ifdef ROLL_TM_CONF_BUFF_NUM
#define ROLL_TM_BUFF_NUM ROLL_TM_CONF_BUFF_NUM
#else
#define ROLL_TM_BUFF_NUM 6
#endif
/*---------------------------------------------------------------------------*/
/*
* Use Short Seed IDs [short: 2, long: 16 (default)]
* It can be argued that we should (and it would be easy to) support both at
* the same time but the draft doesn't list this as a MUST so we opt for
* code/ram savings
*/
#ifdef ROLL_TM_CONF_SHORT_SEEDS
#define ROLL_TM_SHORT_SEEDS ROLL_TM_CONF_SHORT_SEEDS
#else
#define ROLL_TM_SHORT_SEEDS 0
#endif
/*---------------------------------------------------------------------------*/
/*
* Destination address for our ICMPv6 advertisements. The draft gives us a
* choice between LL all-nodes or LL all-routers
*
* We use allrouters unless a conf directive chooses otherwise
*/
#ifdef ROLL_TM_CONF_DEST_ALL_NODES
#define ROLL_TM_DEST_ALL_NODES ROLL_TM_CONF_DEST_ALL_NODES
#else
#define ROLL_TM_DEST_ALL_NODES 0
#endif
/*---------------------------------------------------------------------------*/
/*
* M param for our outgoing messages
* By default, we set the M bit (conservative). Define this as 0 to clear the
* M bit in our outgoing messages (aggressive)
*/
#ifdef ROLL_TM_CONF_SET_M_BIT
#define ROLL_TM_SET_M_BIT ROLL_TM_CONF_SET_M_BIT
#else
#define ROLL_TM_SET_M_BIT 1
#endif
/*---------------------------------------------------------------------------*/
/* Prototypes of additional Trickle Multicast functions */
/*---------------------------------------------------------------------------*/
/**
* \brief Called by the uIPv6 engine when it receives a Trickle Multicast
* ICMPv6 datagram
*/
void roll_tm_icmp_input();
/*---------------------------------------------------------------------------*/
/* Stats datatype */
/*---------------------------------------------------------------------------*/
struct roll_tm_stats {
uint16_t mcast_in_unique;
uint16_t mcast_in_all; /* At layer 3 */
uint16_t mcast_in_ours; /* Unique and we are a group member */
uint16_t mcast_fwd; /* Forwarded by us but we are not the seed */
uint16_t mcast_out; /* We are the seed */
uint16_t mcast_bad;
uint16_t mcast_dropped;
uint16_t icmp_in;
uint16_t icmp_out;
uint16_t icmp_bad;
};
#endif /* ROLL_TM_H_ */