net: Add multicast route API support

Change-Id: I8e05aa534f6b6d6586ffee4878217db35668adba
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>

net/yaip/Kconfig

@@ -69,6 +69,19 @@ config	NET_MAX_NEXTHOPS
 	help
 	This determines how many entries can be stored in nexthop table.
 
+config NET_ROUTE_MCAST
+	bool
+	depends on NET_ROUTE
+	default n
+
+config	NET_MAX_MCAST_ROUTES
+	int "Max number of multicast routing entries stored."
+	default 1
+	depends on NET_ROUTE_MCAST
+	help
+	This determines how many entries can be stored in multicast
+	routing table.
+
 config NET_TCP
 	bool "Enable TCP"
 	default n

net/yaip/route.c

@@ -602,6 +602,92 @@ struct in6_addr *net_route_get_nexthop(struct net_route_entry *route)
 	return NULL;
 }
 
+#if defined(CONFIG_NET_ROUTE_MCAST)
+/*
+ * This array contains multicast routing entries.
+ */
+static
+struct net_route_entry_mcast route_mcast_entries[CONFIG_NET_MAX_MCAST_ROUTES];
+
+int net_route_mcast_foreach(net_route_mcast_cb_t cb,
+			    struct in6_addr *skip,
+			    void *user_data)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < CONFIG_NET_MAX_MCAST_ROUTES; i++) {
+		struct net_route_entry_mcast *route = &route_mcast_entries[i];
+
+		if (route->is_used) {
+			if (skip && net_ipv6_addr_cmp(skip, &route->group)) {
+				continue;
+			}
+
+			cb(route, user_data);
+
+			ret++;
+		}
+	}
+
+	return ret;
+}
+
+struct net_route_entry_mcast *net_route_mcast_add(struct net_if *iface,
+						  struct in6_addr *group)
+{
+	int i;
+
+	for (i = 0; i < CONFIG_NET_MAX_MCAST_ROUTES; i++) {
+		struct net_route_entry_mcast *route = &route_mcast_entries[i];
+
+		if (!route->is_used) {
+			net_ipaddr_copy(&route->group, group);
+
+			route->iface = iface;
+			route->is_used = true;
+
+			return route;
+		}
+	}
+
+	return NULL;
+}
+
+bool net_route_mcast_del(struct net_route_entry_mcast *route)
+{
+	if (route > &route_mcast_entries[CONFIG_NET_MAX_MCAST_ROUTES - 1] ||
+	    route < &route_mcast_entries[0]) {
+		return false;
+	}
+
+	NET_ASSERT_INFO(route->is_used,
+			"Multicast route %d to %s was already removed", i,
+			net_sprint_ipv6_addr(&route->group));
+
+	route->is_used = false;
+
+	return true;
+}
+
+struct net_route_entry_mcast *
+net_route_mcast_lookup(struct in6_addr *group)
+{
+	int i;
+
+	for (i = 0; i < CONFIG_NET_MAX_MCAST_ROUTES; i++) {
+		struct net_route_entry_mcast *route = &route_mcast_entries[i];
+
+		if (!route->is_used) {
+			if (net_ipv6_addr_cmp(group, &route->group)) {
+				return route;
+			}
+		}
+	}
+
+	return NULL;
+}
+#endif /* CONFIG_NET_ROUTE_MCAST */
+
 void net_route_init(void)
 {
 	NET_DBG("Allocated %d routing entries (%d bytes)",

net/yaip/route.h

@@ -158,7 +158,78 @@ struct in6_addr *net_route_get_nexthop(struct net_route_entry *entry);
 struct net_nbr *net_route_get_nbr(struct net_route_entry *route);
 
 void net_route_init(void);
-#else
+
+#if defined(CONFIG_NET_ROUTE_MCAST)
+/**
+ * @brief Multicast route entry.
+ */
+struct net_route_entry_mcast {
+	/** Network interface for the route. */
+	struct net_if *iface;
+
+	/** Extra routing engine specific data */
+	void *data;
+
+	/** IPv6 multicast group of the route. */
+	struct in6_addr group;
+
+	/** Routing entry lifetime in seconds. */
+	uint32_t lifetime;
+
+	/** Is this entry in user or not */
+	bool is_used;
+};
+
+typedef void (*net_route_mcast_cb_t)(struct net_route_entry_mcast *entry,
+				     void *user_data);
+
+/**
+ * @brief Go through all the multicast routing entries and call callback
+ * for each entry that is in use.
+ *
+ * @param cb User supplied callback function to call.
+ * @param skip Do not call callback for this address.
+ * @param user_data User specified data.
+ *
+ * @return Total number of multicast routing entries that are in use.
+ */
+int net_route_mcast_foreach(net_route_mcast_cb_t cb,
+			    struct in6_addr *skip,
+			    void *user_data);
+
+/**
+ * @brief Add a multicast routing entry.
+ *
+ * @param iface Network interface to use.
+ * @param group IPv6 multicast address.
+ *
+ * @return Multicast routing entry.
+ */
+struct net_route_entry_mcast *net_route_mcast_add(struct net_if *iface,
+						  struct in6_addr *group);
+
+/**
+ * @brief Delete a multicast routing entry.
+ *
+ * @param route Multicast routing entry.
+ *
+ * @return True if entry was deleted, false otherwise.
+ */
+bool net_route_mcast_del(struct net_route_entry_mcast *route);
+
+/**
+ * @brief Lookup a multicast routing entry.
+ *
+ * @param group IPv6 multicast group address
+ *
+ * @return Routing entry corresponding this multicast group.
+ */
+struct net_route_entry_mcast *
+net_route_mcast_lookup(struct in6_addr *group);
+
+#endif /* CONFIG_NET_ROUTE_MCAST */
+
+#else /* CONFIG_NET_ROUTE */
 #define net_route_init(...)
 #endif /* CONFIG_NET_ROUTE */