osd-contiki/core/net/ipv6/multicast/uip-mcast6-route.c
George Oikonomou 64c21638cd Multicast routing table manipulation
We store multicast routes in a separate table since we don't need
as much information as we need for normal routes
2014-03-05 20:31:15 +00:00

134 lines
4.5 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 copyright holder 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDER 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
* Multicast routing table manipulation
*
* \author
* George Oikonomou - <oikonomou@users.sourceforge.net>
*/
#include "contiki.h"
#include "lib/list.h"
#include "lib/memb.h"
#include "net/ip/uip.h"
#include "net/ipv6/multicast/uip-mcast6-route.h"
#include <stdint.h>
#include <string.h>
#if UIP_CONF_IPV6
/*---------------------------------------------------------------------------*/
/* Size of the multicast routing table */
#ifdef UIP_MCAST6_ROUTE_CONF_ROUTES
#define UIP_MCAST6_ROUTE_ROUTES UIP_MCAST6_ROUTE_CONF_ROUTES
#else
#define UIP_MCAST6_ROUTE_ROUTES 1
#endif /* UIP_CONF_DS6_MCAST_ROUTES */
/*---------------------------------------------------------------------------*/
LIST(mcast_route_list);
MEMB(mcast_route_memb, uip_mcast6_route_t, UIP_MCAST6_ROUTE_ROUTES);
static uip_mcast6_route_t *locmcastrt;
/*---------------------------------------------------------------------------*/
uip_mcast6_route_t *
uip_mcast6_route_lookup(uip_ipaddr_t *group)
{
locmcastrt = NULL;
for(locmcastrt = list_head(mcast_route_list);
locmcastrt != NULL;
locmcastrt = list_item_next(locmcastrt)) {
if(uip_ipaddr_cmp(&locmcastrt->group, group)) {
return locmcastrt;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
uip_mcast6_route_t *
uip_mcast6_route_add(uip_ipaddr_t *group)
{
/* _lookup must return NULL, i.e. the prefix does not exist in our table */
locmcastrt = uip_mcast6_route_lookup(group);
if(locmcastrt == NULL) {
/* Allocate an entry and add the group to the list */
locmcastrt = memb_alloc(&mcast_route_memb);
if(locmcastrt == NULL) {
return NULL;
}
list_add(mcast_route_list, locmcastrt);
}
/* Reaching here means we either found the prefix or allocated a new one */
uip_ipaddr_copy(&(locmcastrt->group), group);
return locmcastrt;
}
/*---------------------------------------------------------------------------*/
void
uip_mcast6_route_rm(uip_mcast6_route_t *route)
{
/* Make sure it's actually in the list */
for(locmcastrt = list_head(mcast_route_list);
locmcastrt != NULL;
locmcastrt = list_item_next(locmcastrt)) {
if(locmcastrt == route) {
list_remove(mcast_route_list, route);
memb_free(&mcast_route_memb, route);
return;
}
}
}
/*---------------------------------------------------------------------------*/
uip_mcast6_route_t *
uip_mcast6_route_list_head(void)
{
return list_head(mcast_route_list);
}
/*---------------------------------------------------------------------------*/
int
uip_mcast6_route_count(void)
{
return list_length(mcast_route_list);
}
/*---------------------------------------------------------------------------*/
void
uip_mcast6_route_init()
{
memb_init(&mcast_route_memb);
list_init(mcast_route_list);
}
/*---------------------------------------------------------------------------*/
#endif /* UIP_CONF_IPV6 */