core: add nm_ip4_config_get_subnet_for_host() function

And nm_ip6_config_get_subnet_for_host().

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

4 files changed, 55 insertions, 4 deletions

diff --git a/src/nm-ip4-config.c b/src/nm-ip4-config.c
index b053f4fe86..313b4729b7 100644
--- a/src/nm-ip4-config.c
+++ b/src/nm-ip4-config.c
@@ -1196,12 +1196,12 @@ const NMPlatformIP4Route *
 nm_ip4_config_get_direct_route_for_host (const NMIP4Config *config, guint32 host)
 {
 	NMIP4ConfigPrivate *priv = NM_IP4_CONFIG_GET_PRIVATE (config);
-	int i;
+	guint i;
 	NMPlatformIP4Route *best_route = NULL;
 
 	g_return_val_if_fail (host, NULL);
 
-	for (i = 0; i < priv->routes->len; i++ ) {
+		for (i = 0; i < priv->routes->len; i++) {
 		NMPlatformIP4Route *item = &g_array_index (priv->routes, NMPlatformIP4Route, i);
 
 		if (item->gateway != 0)
@@ -1222,6 +1222,28 @@ nm_ip4_config_get_direct_route_for_host (const NMIP4Config *config, guint32 host
 	return best_route;
 }
 
+const NMPlatformIP4Address *
+nm_ip4_config_get_subnet_for_host (const NMIP4Config *config, guint32 host)
+{
+	NMIP4ConfigPrivate *priv = NM_IP4_CONFIG_GET_PRIVATE (config);
+	guint i;
+	NMPlatformIP4Address *subnet = NULL;
+
+	g_return_val_if_fail (host, NULL);
+
+	for (i = 0; i < priv->addresses->len; i++) {
+		NMPlatformIP4Address *item = &g_array_index (priv->addresses, NMPlatformIP4Address, i);
+
+		if (subnet && subnet->plen >= item->plen)
+			continue;
+		if (nm_utils_ip4_address_clear_host_address (host, item->plen) != nm_utils_ip4_address_clear_host_address (item->address, item->plen))
+			continue;
+		subnet = item;
+	}
+
+	return subnet;
+}
+
 /******************************************************************/
 
 void
diff --git a/src/nm-ip4-config.h b/src/nm-ip4-config.h
index 48aaeaf01e..5bd7fa3ce9 100644
--- a/src/nm-ip4-config.h
+++ b/src/nm-ip4-config.h
@@ -93,6 +93,7 @@ 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_direct_route_for_host (const NMIP4Config *config, guint32 host);
+const NMPlatformIP4Address *nm_ip4_config_get_subnet_for_host (const NMIP4Config *config, guint32 host);
 
 /* Nameservers */
 void nm_ip4_config_reset_nameservers (NMIP4Config *config);
diff --git a/src/nm-ip6-config.c b/src/nm-ip6-config.c
index 1f27072716..98a4b01965 100644
--- a/src/nm-ip6-config.c
+++ b/src/nm-ip6-config.c
@@ -1203,13 +1203,13 @@ 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);
-	int i;
+	guint i;
 	struct in6_addr network2, host2;
 	NMPlatformIP6Route *best_route = NULL;
 
 	g_return_val_if_fail (host && !IN6_IS_ADDR_UNSPECIFIED (host), NULL);
 
-	for (i = 0; i < priv->routes->len; i++ ) {
+	for (i = 0; i < priv->routes->len; i++) {
 		NMPlatformIP6Route *item = &g_array_index (priv->routes, NMPlatformIP6Route, i);
 
 		if (!IN6_IS_ADDR_UNSPECIFIED (&item->gateway))
@@ -1234,6 +1234,33 @@ nm_ip6_config_get_direct_route_for_host (const NMIP6Config *config, const struct
 	return best_route;
 }
 
+const NMPlatformIP6Address *
+nm_ip6_config_get_subnet_for_host (const NMIP6Config *config, const struct in6_addr *host)
+{
+	NMIP6ConfigPrivate *priv = NM_IP6_CONFIG_GET_PRIVATE (config);
+	guint i;
+	NMPlatformIP6Address *subnet = NULL;
+	struct in6_addr subnet2, host2;
+
+	g_return_val_if_fail (host && !IN6_IS_ADDR_UNSPECIFIED (host), NULL);
+
+	for (i = 0; i < priv->addresses->len; i++) {
+		NMPlatformIP6Address *item = &g_array_index (priv->addresses, NMPlatformIP6Address, i);
+
+		if (subnet && subnet->plen >= item->plen)
+			continue;
+
+		nm_utils_ip6_address_clear_host_address (&host2, host, item->plen);
+		nm_utils_ip6_address_clear_host_address (&subnet2, &item->address, item->plen);
+
+		if (IN6_ARE_ADDR_EQUAL (&subnet2, &host2))
+			subnet = item;
+	}
+
+	return subnet;
+}
+
+
 /******************************************************************/
 
 void
diff --git a/src/nm-ip6-config.h b/src/nm-ip6-config.h
index 7abf57a779..4036bfc3a1 100644
--- a/src/nm-ip6-config.h
+++ b/src/nm-ip6-config.h
@@ -94,6 +94,7 @@ 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_direct_route_for_host (const NMIP6Config *config, const struct in6_addr *host);
+const NMPlatformIP6Address *nm_ip6_config_get_subnet_for_host (const NMIP6Config *config, const struct in6_addr *host);
 
 /* Nameservers */
 void nm_ip6_config_reset_nameservers (NMIP6Config *config);