core: wait with "startup complete" for both IPv4 and IPv6 dynamic configuration

In case of DHCP4, DHCP6 and/or SLAAC, delay "startup complete" until
both IPv4 and IPv6 are ready. This especially has an effect on
nm-online/NetworkManager-wait-online.service, which blocks until
configuration of both IPv4 and IPv6 is ready.

We queue a pending_action when automatic configuration starts and
remove it again, when we receive an address. Before, "startup complete"
was reached when either one of the two IP protocols was configured.

https://bugzilla.redhat.com/show_bug.cgi?id=1086906

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

man/nm-online.1.in

@@ -35,7 +35,12 @@ is a utility to find out whether we are online. It is done by asking
 NetworkManager about its status. When run, \fInm\-online\fP waits until
 NetworkManager reports an active connection, or specified timeout expires. On
 exit, the returned status code should be checked (see the return codes bellow).
-
+.P
+By default NetworkManager waits for IPv4 dynamic addressing to complete but does
+not wait for the "auto" IPv6 dynamic addressing.  To wait for IPv6 addressing to
+complete, either (1) change the network connection's IPv6 "may-fail" setting to "no",
+and/or (2) change the IPv6 addressing method to "manual" or "dhcp", to indicate that
+IPv6 connectivity is expected.
 .SH OPTIONS
 .TP
 .B \-t, \-\-timeout <timeout_value>

src/devices/nm-device.c

@@ -156,6 +156,10 @@ G_DEFINE_ABSTRACT_TYPE_WITH_CODE (NMDevice, nm_device, G_TYPE_OBJECT,
 
 #define NM_DEVICE_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), NM_TYPE_DEVICE, NMDevicePrivate))
 
+#define PENDING_ACTION_DHCP4 "dhcp4"
+#define PENDING_ACTION_DHCP6 "dhcp6"
+#define PENDING_ACTION_AUTOCONF6 "autoconf6"
+
 typedef enum {
 	IP_NONE = 0,
 	IP_WAIT,
@@ -2815,6 +2819,8 @@ dhcp4_start (NMDevice *self,
 	                                              G_CALLBACK (dhcp4_timeout),
 	                                              self);
 
+	nm_device_add_pending_action (self, PENDING_ACTION_DHCP4, TRUE);
+
 	/* DHCP devices will be notified by the DHCP manager when stuff happens */
 	return NM_ACT_STAGE_RETURN_POSTPONE;
 }
@@ -3200,6 +3206,7 @@ dhcp6_start (NMDevice *self,
              guint32 dhcp_opt,
              NMDeviceStateReason *reason)
 {
+	NMSettingIP6Config *s_ip6;
 	NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
 	NMActStageReturn ret = NM_ACT_STAGE_RETURN_FAILURE;
 	GByteArray *tmp = NULL;
@@ -3248,6 +3255,11 @@ dhcp6_start (NMDevice *self,
 		                                              G_CALLBACK (dhcp6_timeout),
 		                                              self);
 
+		s_ip6 = nm_connection_get_setting_ip6_config (connection);
+		if (!nm_setting_ip6_config_get_may_fail (s_ip6) ||
+		    !strcmp (nm_setting_ip6_config_get_method (s_ip6), NM_SETTING_IP6_CONFIG_METHOD_DHCP))
+			nm_device_add_pending_action (self, PENDING_ACTION_DHCP6, TRUE);
+
 		/* DHCP devices will be notified by the DHCP manager when stuff happens */
 		ret = NM_ACT_STAGE_RETURN_POSTPONE;
 	} else {
@@ -3614,6 +3626,9 @@ addrconf6_start (NMDevice *self, NMSettingIP6ConfigPrivacy use_tempaddr)
 	priv->rdisc_use_tempaddr = use_tempaddr;
 	print_support_extended_ifa_flags (use_tempaddr);
 
+	if (!nm_setting_ip6_config_get_may_fail (nm_connection_get_setting_ip6_config (connection)))
+		nm_device_add_pending_action (self, PENDING_ACTION_AUTOCONF6, TRUE);
+
 	/* ensure link local is ready... */
 	ret = linklocal6_start (self);
 	if (ret == NM_ACT_STAGE_RETURN_SUCCESS)
@@ -3657,6 +3672,8 @@ addrconf6_cleanup (NMDevice *self)
 		priv->rdisc_config_changed_sigid = 0;
 	}
 
+	nm_device_remove_pending_action (self, PENDING_ACTION_AUTOCONF6, FALSE);
+
 	g_clear_object (&priv->ac_ip6_config);
 	g_clear_object (&priv->rdisc);
 }
@@ -4489,6 +4506,9 @@ nm_device_activate_ip4_config_commit (gpointer user_data)
 
 	/* Enter the IP_CHECK state if this is the first method to complete */
 	priv->ip4_state = IP_DONE;
+
+	nm_device_remove_pending_action (self, PENDING_ACTION_DHCP4, FALSE);
+
 	if (nm_device_get_state (self) == NM_DEVICE_STATE_IP_CONFIG)
 		nm_device_state_changed (self, NM_DEVICE_STATE_IP_CHECK, NM_DEVICE_STATE_REASON_NONE);
 
@@ -4564,6 +4584,10 @@ nm_device_activate_ip6_config_commit (gpointer user_data)
 	if (ip6_config_merge_and_apply (self, TRUE, &reason)) {
 		/* Enter the IP_CHECK state if this is the first method to complete */
 		priv->ip6_state = IP_DONE;
+
+		nm_device_remove_pending_action (self, PENDING_ACTION_DHCP6, FALSE);
+		nm_device_remove_pending_action (self, PENDING_ACTION_AUTOCONF6, FALSE);
+
 		if (nm_device_get_state (self) == NM_DEVICE_STATE_IP_CONFIG)
 			nm_device_state_changed (self, NM_DEVICE_STATE_IP_CHECK, NM_DEVICE_STATE_REASON_NONE);
 	} else {
@@ -4649,6 +4673,8 @@ dhcp4_cleanup (NMDevice *self, gboolean stop, gboolean release)
 			priv->dhcp4_timeout_sigid = 0;
 		}
 
+		nm_device_remove_pending_action (self, PENDING_ACTION_DHCP4, FALSE);
+
 		if (stop)
 			nm_dhcp_client_stop (priv->dhcp4_client, release);
 
@@ -4686,6 +4712,8 @@ dhcp6_cleanup (NMDevice *self, gboolean stop, gboolean release)
 			priv->dhcp6_timeout_sigid = 0;
 		}
 
+		nm_device_remove_pending_action (self, PENDING_ACTION_DHCP6, FALSE);
+
 		if (stop)
 			nm_dhcp_client_stop (priv->dhcp6_client, release);