nes-proj/core/net/ipv6/multicast/uip-mcast6.h
George Oikonomou 5efb3f0769 Tidy-up multicast documentation
* Create a doxygen group and add files to it, so that documents appear as modules rather than simply under files
* Document plenty of functions, macros, constants, data types which were previously undocumented
* Re-structure some doxygen comments to improve structure and readability
2015-02-15 23:29:59 +01:00

180 lines
6.9 KiB
C

/*
* 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.
*/
/**
* \addtogroup uip6
* @{
*/
/**
* \defgroup uip6-multicast IPv6 Multicast Forwarding
*
* We currently support 2 engines:
* - 'Stateless Multicast RPL Forwarding' (SMRF)
* RPL does group management as per the RPL docs, SMRF handles datagram
* forwarding
* - 'Multicast Forwarding with Trickle' according to the algorithm described
* in the internet draft:
* http://tools.ietf.org/html/draft-ietf-roll-trickle-mcast
*
* @{
*/
/**
* \file
* This header file contains configuration directives for uIPv6
* multicast support.
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#ifndef UIP_MCAST6_H_
#define UIP_MCAST6_H_
#include "contiki-conf.h"
#include "net/ipv6/multicast/uip-mcast6-engines.h"
#include "net/ipv6/multicast/uip-mcast6-route.h"
#include "net/ipv6/multicast/smrf.h"
#include "net/ipv6/multicast/roll-tm.h"
#include <string.h>
/*---------------------------------------------------------------------------*/
/* Constants */
/*---------------------------------------------------------------------------*/
#define UIP_MCAST6_DROP 0
#define UIP_MCAST6_ACCEPT 1
/*---------------------------------------------------------------------------*/
/* Multicast Address Scopes (RFC 4291 & draft-ietf-6man-multicast-scopes) */
#define UIP_MCAST6_SCOPE_INTERFACE 0x01
#define UIP_MCAST6_SCOPE_LINK_LOCAL 0x02
#define UIP_MCAST6_SCOPE_REALM_LOCAL 0x03 /* draft-ietf-6man-multicast-scopes */
#define UIP_MCAST6_SCOPE_ADMIN_LOCAL 0x04
#define UIP_MCAST6_SCOPE_SITE_LOCAL 0x05
#define UIP_MCAST6_SCOPE_ORG_LOCAL 0x08
#define UIP_MCAST6_SCOPE_GLOBAL 0x0E
/*---------------------------------------------------------------------------*/
/* Choose an engine or turn off based on user configuration */
/*---------------------------------------------------------------------------*/
#ifdef UIP_MCAST6_CONF_ENGINE
#define UIP_MCAST6_ENGINE UIP_MCAST6_CONF_ENGINE
#else
#define UIP_MCAST6_ENGINE UIP_MCAST6_ENGINE_NONE
#endif
/*---------------------------------------------------------------------------*/
/*
* Multicast API. Similar to NETSTACK, each engine must define a driver and
* populate the fields with suitable function pointers
*/
/**
* \brief The data structure used to represent a multicast engine
*/
struct uip_mcast6_driver {
/** The driver's name */
char *name;
/** Initialize the multicast engine */
void (* init)(void);
/**
* \brief Process an outgoing datagram with a multicast IPv6 destination
* address
*
* This may be needed if the multicast engine needs to, for example,
* add IPv6 extension headers to the datagram, cache it, decide it
* needs dropped etc.
*
* It is sometimes desirable to let the engine handle datagram
* dispatch instead of letting the networking core do it. If the
* engine decides to send the datagram itself, it must afterwards
* set uip_len = 0 to prevent the networking core from sending too
*/
void (* out)(void);
/**
* \brief Process an incoming multicast datagram and determine whether it
* should be delivered up the stack or not.
*
* \return 0: Drop, 1: Deliver
*
*
* When a datagram with a multicast destination address is received,
* the forwarding logic in core is bypassed. Instead, we let the
* multicast engine handle forwarding internally if and as necessary.
* This function is where forwarding logic must be hooked in.
*
* Once the engine is done with forwarding, it must signal via the
* return value whether the datagram needs delivered up the network
* stack.
*/
uint8_t (* in)(void);
};
/*---------------------------------------------------------------------------*/
/**
* \brief Get a multicast address' scope.
* a is of type uip_ip6addr_t*
*/
#define uip_mcast6_get_address_scope(a) ((a)->u8[1] & 0x0F)
/*---------------------------------------------------------------------------*/
/* Configure multicast and core/net to play nicely with the selected engine */
#if UIP_MCAST6_ENGINE
/* Enable Multicast hooks in the uip6 core */
#define UIP_CONF_IPV6_MULTICAST 1
#if UIP_MCAST6_ENGINE == UIP_MCAST6_ENGINE_ROLL_TM
#define RPL_CONF_MULTICAST 0 /* Not used by trickle */
#define UIP_CONF_IPV6_ROLL_TM 1 /* ROLL Trickle ICMP type support */
#define UIP_MCAST6 roll_tm_driver
#elif UIP_MCAST6_ENGINE == UIP_MCAST6_ENGINE_SMRF
#define RPL_CONF_MULTICAST 1
#define UIP_MCAST6 smrf_driver
#else
#error "Multicast Enabled with an Unknown Engine."
#error "Check the value of UIP_MCAST6_CONF_ENGINE in conf files."
#endif
#endif /* UIP_MCAST6_ENGINE */
extern const struct uip_mcast6_driver UIP_MCAST6;
/*---------------------------------------------------------------------------*/
/* Configuration Checks */
/*---------------------------------------------------------------------------*/
#if RPL_CONF_MULTICAST && (!UIP_CONF_IPV6_RPL)
#error "The selected Multicast mode requires UIP_CONF_IPV6_RPL != 0"
#error "Check the value of UIP_CONF_IPV6_RPL in conf files."
#endif
/*---------------------------------------------------------------------------*/
#endif /* UIP_MCAST6_H_ */
/*---------------------------------------------------------------------------*/
/** @} */
/** @} */