core: add nm_ipX_config_get_default_route() functions

Add functions nm_ip4_config_get_default_route() and
nm_ip6_config_get_default_route() to search for a default
route in NMIP4Config and NMIP6Config.

Signed-off-by: Thomas Haller <thaller@redhat.com>

4 files changed, 55 insertions, 0 deletions

diff --git a/src/nm-ip4-config.c b/src/nm-ip4-config.c
index a3e85aa259..1e1ca1e85c 100644
--- a/src/nm-ip4-config.c
+++ b/src/nm-ip4-config.c
@@ -1191,6 +1191,32 @@ nm_ip4_config_get_route (const NMIP4Config *config, guint i)
 }
 
 const NMPlatformIP4Route *
+nm_ip4_config_get_default_route (const NMIP4Config *config)
+{
+	NMIP4ConfigPrivate *priv = NM_IP4_CONFIG_GET_PRIVATE (config);
+	NMPlatformIP4Route *default_route = NULL;
+	int i;
+
+	for (i = 0; i < priv->routes->len; i++ ) {
+		NMPlatformIP4Route *item = &g_array_index (priv->routes, NMPlatformIP4Route, i);
+
+		if (!NM_PLATFORM_IP_ROUTE_IS_DEFAULT (item))
+			continue;
+
+		/* there might be more then one default routes. Choose the best one. */
+		if (!default_route)
+			default_route = item;
+		else if (item->metric < default_route->metric)
+			default_route = item;
+		else if (   item->metric == default_route->metric
+		         && !item->gateway && default_route->gateway)
+			default_route = item;
+	}
+
+	return default_route;
+}
+
+const NMPlatformIP4Route *
 nm_ip4_config_get_direct_route_for_host (const NMIP4Config *config, guint32 host)
 {
 	NMIP4ConfigPrivate *priv = NM_IP4_CONFIG_GET_PRIVATE (config);
diff --git a/src/nm-ip4-config.h b/src/nm-ip4-config.h
index be5a30d01b..39955efb3b 100644
--- a/src/nm-ip4-config.h
+++ b/src/nm-ip4-config.h
@@ -92,6 +92,7 @@ void nm_ip4_config_del_route (NMIP4Config *config, guint i);
 guint32 nm_ip4_config_get_num_routes (const NMIP4Config *config);
 const NMPlatformIP4Route *nm_ip4_config_get_route (const NMIP4Config *config, guint32 i);
 
+const NMPlatformIP4Route *nm_ip4_config_get_default_route (const NMIP4Config *config);
 const NMPlatformIP4Route *nm_ip4_config_get_direct_route_for_host (const NMIP4Config *config, guint32 host);
 
 /* Nameservers */
diff --git a/src/nm-ip6-config.c b/src/nm-ip6-config.c
index 135c2f6fef..2d89681300 100644
--- a/src/nm-ip6-config.c
+++ b/src/nm-ip6-config.c
@@ -1198,6 +1198,33 @@ nm_ip6_config_get_route (const NMIP6Config *config, guint i)
 }
 
 const NMPlatformIP6Route *
+nm_ip6_config_get_default_route (const NMIP6Config *config)
+{
+	NMIP6ConfigPrivate *priv = NM_IP6_CONFIG_GET_PRIVATE (config);
+	NMPlatformIP6Route *default_route = NULL;
+	int i;
+
+	for (i = 0; i < priv->routes->len; i++ ) {
+		NMPlatformIP6Route *item = &g_array_index (priv->routes, NMPlatformIP6Route, i);
+
+		if (!NM_PLATFORM_IP_ROUTE_IS_DEFAULT (item))
+			continue;
+
+		/* there might be more then one default routes. Choose the best one. */
+		if (!default_route)
+			default_route = item;
+		else if (nm_utils_ip6_route_metric_normalize (item->metric) < nm_utils_ip6_route_metric_normalize (default_route->metric))
+			default_route = item;
+		else if (   nm_utils_ip6_route_metric_normalize (item->metric) == nm_utils_ip6_route_metric_normalize (default_route->metric)
+		         && IN6_IS_ADDR_UNSPECIFIED (&item->gateway)
+		         && !IN6_IS_ADDR_UNSPECIFIED (&default_route->gateway))
+			default_route = item;
+	}
+
+	return default_route;
+}
+
+const NMPlatformIP6Route *
 nm_ip6_config_get_direct_route_for_host (const NMIP6Config *config, const struct in6_addr *host)
 {
 	NMIP6ConfigPrivate *priv = NM_IP6_CONFIG_GET_PRIVATE (config);
diff --git a/src/nm-ip6-config.h b/src/nm-ip6-config.h
index 7abf57a779..94fad5ed12 100644
--- a/src/nm-ip6-config.h
+++ b/src/nm-ip6-config.h
@@ -93,6 +93,7 @@ void nm_ip6_config_del_route (NMIP6Config *config, guint i);
 guint32 nm_ip6_config_get_num_routes (const NMIP6Config *config);
 const NMPlatformIP6Route *nm_ip6_config_get_route (const NMIP6Config *config, guint32 i);
 
+const NMPlatformIP6Route *nm_ip6_config_get_default_route (const NMIP6Config *config);
 const NMPlatformIP6Route *nm_ip6_config_get_direct_route_for_host (const NMIP6Config *config, const struct in6_addr *host);
 
 /* Nameservers */