core: improve ifname matching of existing x generated connections (rh #1077743)

DEVICE="ens3"
ONBOOT=yes
NETBOOT=yes
UUID="23466771-f5fa-4ca9-856f-eaf4a8e20c3f"
BOOTPROTO=none
IPADDR="10.0.0.2"
PREFIX="24"
GATEWAY="10.0.0.1"
HWADDR="52:54:00:12:34:56"
TYPE=Ethernet
NAME="ens3"

This ifcfg file results in connection.interface-name=ens3.
However, device-generated connection didn't set interface-name property.

Fix that by setting interface-name property when generating a connection. Also
allow matching connections if interface-name is not set in a connection.

https://bugzilla.redhat.com/show_bug.cgi?id=1077743

src/NetworkManagerUtils.c

@@ -753,6 +753,35 @@ check_ip4_method_disabled_auto (NMConnection *orig,
 	return FALSE;
 }
 
+static gboolean
+check_connection_interface_name (NMConnection *orig,
+                                 NMConnection *candidate,
+                                 GHashTable *settings)
+{
+	GHashTable *props;
+	const char *orig_ifname, *cand_ifname;
+	NMSettingConnection *s_con_orig, *s_con_cand;
+
+	props = g_hash_table_lookup (settings, NM_SETTING_CONNECTION_SETTING_NAME);
+	if (   !props
+	    || (g_hash_table_size (props) != 1)
+	    || !g_hash_table_lookup (props, NM_SETTING_CONNECTION_INTERFACE_NAME)) {
+		/* We only handle 'interface-name' here. */
+		return FALSE;
+	}
+
+	/* If one of the interface name is NULL, we accept that connection */
+	s_con_orig = nm_connection_get_setting_connection (orig);
+	s_con_cand = nm_connection_get_setting_connection (candidate);
+	orig_ifname = nm_setting_connection_get_interface_name (s_con_orig);
+	cand_ifname = nm_setting_connection_get_interface_name (s_con_cand);
+
+	if (!orig_ifname || !cand_ifname)
+		return TRUE;
+
+	return FALSE;
+}
+
 static NMConnection *
 check_possible_match (NMConnection *orig,
                       NMConnection *candidate,
@@ -770,6 +799,9 @@ check_possible_match (NMConnection *orig,
 	if (check_ip4_method_disabled_auto (orig, candidate, settings, device_has_carrier))
 		return candidate;
 
+	if (check_connection_interface_name (orig, candidate, settings))
+		return candidate;
+
 	return NULL;
 }
 

src/devices/nm-device.c

@@ -1790,6 +1790,7 @@ nm_device_generate_connection (NMDevice *device)
 	              NM_SETTING_CONNECTION_UUID, uuid,
 	              NM_SETTING_CONNECTION_ID, name,
 	              NM_SETTING_CONNECTION_AUTOCONNECT, FALSE,
+	              NM_SETTING_CONNECTION_INTERFACE_NAME, ifname,
 	              NM_SETTING_CONNECTION_TIMESTAMP, (guint64) time (NULL),
 	              NULL);
 	if (klass->connection_type)

src/tests/test-general.c

@@ -312,6 +312,40 @@ test_connection_match_ip4_method (void)
 	g_object_unref (copy);
 }
 
+static void
+test_connection_match_interface_name (void)
+{
+	NMConnection *orig, *copy, *matched;
+	GSList *connections = NULL;
+	NMSettingConnection *s_con;
+
+	orig = _match_connection_new ();
+	copy = nm_connection_duplicate (orig);
+	connections = g_slist_append (connections, copy);
+
+	/* Check that if the original connection is IPv6 method=link-local, and the
+	 * candidate is method=ignore, that the candidate is matched.
+	 */
+	s_con = nm_connection_get_setting_connection (orig);
+	g_assert (s_con);
+	g_object_set (G_OBJECT (s_con),
+	              NM_SETTING_CONNECTION_INTERFACE_NAME, "em1",
+	              NULL);
+
+	s_con = nm_connection_get_setting_connection (copy);
+	g_assert (s_con);
+	g_object_set (G_OBJECT (s_con),
+	              NM_SETTING_CONNECTION_INTERFACE_NAME, NULL,
+	              NULL);
+
+	matched = nm_utils_match_connection (connections, orig, TRUE, NULL, NULL);
+	g_assert (matched == copy);
+
+	g_slist_free (connections);
+	g_object_unref (orig);
+	g_object_unref (copy);
+}
+
 /*******************************************/
 
 int
@@ -328,6 +362,7 @@ main (int argc, char **argv)
 	g_test_add_func ("/general/connection-match/ip6-method", test_connection_match_ip6_method);
 	g_test_add_func ("/general/connection-match/ip6-method-ignore", test_connection_match_ip6_method_ignore);
 	g_test_add_func ("/general/connection-match/ip4-method", test_connection_match_ip4_method);
+	g_test_add_func ("/general/connection-match/con-interface-name", test_connection_match_interface_name);
 
 	return g_test_run ();
 }