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

core/net/ipv6/multicast/uip-mcast6-route.c

@@ -0,0 +1,133 @@
+/*
+ * 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 */