e4a9ce242d
https://bugzilla.gnome.org/show_bug.cgi?id=783391 https://bugzilla.redhat.com/show_bug.cgi?id=1575370
402 lines
14 KiB
Diff
402 lines
14 KiB
Diff
From cc598e315eb264b44bd4b99db4f0a0f8e95111de Mon Sep 17 00:00:00 2001
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From: Beniamino Galvani <bgalvani@redhat.com>
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Date: Wed, 7 Mar 2018 15:27:44 +0100
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Subject: [PATCH] dhcp: handle expiry by letting the client continue for some
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time
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Previously we would kill the client when the lease expired and we
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restarted it 3 times at 2 minutes intervals before failing the
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connection. If the client is killed after it received a NACK from the
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server, it doesn't have the chance to delete the lease file and the
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next time it is started it will request the same lease again.
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Also, the previous restart logic is a bit convoluted.
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Since clients already know how to deal with NACKs, let them continue
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for a grace period after the expiry. When the grace period ends, we
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fail the method and this can either fail the whole connection or keep
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it active depending on the may-fail configuration.
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https://bugzilla.gnome.org/show_bug.cgi?id=783391
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(cherry picked from commit 17009ed91da8b3e0b10ee7e94d220be9bd3fa84c)
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(cherry picked from commit 7fbbe7ebee99785e38d39c37e515a64a28edef0f)
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---
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src/devices/nm-device.c | 220 ++++++++++++++++++++----------------------------
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1 file changed, 92 insertions(+), 128 deletions(-)
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diff --git a/src/devices/nm-device.c b/src/devices/nm-device.c
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index c3bba5206..84f1e1dae 100644
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--- a/src/devices/nm-device.c
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+++ b/src/devices/nm-device.c
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@@ -83,9 +83,8 @@ _LOG_DECLARE_SELF (NMDevice);
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/*****************************************************************************/
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-#define DHCP_RESTART_TIMEOUT 120
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-#define DHCP_NUM_TRIES_MAX 3
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#define DEFAULT_AUTOCONNECT TRUE
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+#define DHCP_GRACE_PERIOD_SEC 480
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#define CARRIER_WAIT_TIME_MS 6000
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#define CARRIER_WAIT_TIME_AFTER_MTU_MS 10000
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@@ -387,10 +386,9 @@ typedef struct _NMDevicePrivate {
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NMDhcpClient * client;
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gulong state_sigid;
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NMDhcp4Config * config;
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- guint restart_id;
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- guint num_tries_left;
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char * pac_url;
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bool was_active;
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+ guint grace_id;
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} dhcp4;
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struct {
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@@ -461,10 +459,9 @@ typedef struct _NMDevicePrivate {
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NMIP6Config * ip6_config;
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/* Event ID of the current IP6 config from DHCP */
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char * event_id;
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- guint restart_id;
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- guint num_tries_left;
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guint needed_prefixes;
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bool was_active;
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+ guint grace_id;
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} dhcp6;
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gboolean needs_ip6_subnet;
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@@ -556,7 +553,6 @@ static void realize_start_setup (NMDevice *self,
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NMUnmanFlagOp unmanaged_user_explicit);
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static void _set_mtu (NMDevice *self, guint32 mtu);
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static void _commit_mtu (NMDevice *self, const NMIP4Config *config);
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-static void dhcp_schedule_restart (NMDevice *self, int addr_family, const char *reason);
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static void _cancel_activation (NMDevice *self);
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/*****************************************************************************/
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@@ -5898,7 +5894,7 @@ dhcp4_cleanup (NMDevice *self, CleanupType cleanup_type, gboolean release)
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{
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NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
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- nm_clear_g_source (&priv->dhcp4.restart_id);
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+ nm_clear_g_source (&priv->dhcp4.grace_id);
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g_clear_pointer (&priv->dhcp4.pac_url, g_free);
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if (priv->dhcp4.client) {
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@@ -6043,20 +6039,17 @@ dhcp4_lease_change (NMDevice *self, NMIP4Config *config)
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}
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static gboolean
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-dhcp4_restart_cb (gpointer user_data)
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+dhcp4_grace_period_expired (gpointer user_data)
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{
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NMDevice *self = user_data;
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- NMDevicePrivate *priv;
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-
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- g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
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- priv = NM_DEVICE_GET_PRIVATE (self);
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- priv->dhcp4.restart_id = 0;
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+ _LOGI (LOGD_DHCP4, "DHCPv4: grace period expired");
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- if (dhcp4_start (self) == NM_ACT_STAGE_RETURN_FAILURE)
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- dhcp_schedule_restart (self, AF_INET, NULL);
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+ nm_device_ip_method_failed (self, AF_INET,
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+ NM_DEVICE_STATE_REASON_IP_CONFIG_EXPIRED);
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+ /* If the device didn't fail, the DHCP client will continue */
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- return FALSE;
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+ return G_SOURCE_REMOVE;
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}
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static void
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@@ -6064,44 +6057,48 @@ dhcp4_fail (NMDevice *self, gboolean timeout)
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{
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NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
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- _LOGD (LOGD_DHCP4, "DHCPv4 failed: timeout %d, num tries left %u",
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- timeout, priv->dhcp4.num_tries_left);
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+ _LOGD (LOGD_DHCP4, "DHCPv4 failed%s", timeout ? " (timeout)" : "");
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- dhcp4_cleanup (self, CLEANUP_TYPE_DECONFIGURE, FALSE);
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-
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- /* Don't fail if there are static addresses configured on
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- * the device, instead retry after some time.
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+ /* Keep client running if there are static addresses configured
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+ * on the interface.
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*/
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if ( priv->ip4_state == IP_DONE
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&& priv->con_ip4_config
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- && nm_ip4_config_get_num_addresses (priv->con_ip4_config) > 0) {
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- dhcp_schedule_restart (self, AF_INET, "device has IP addresses");
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+ && nm_ip4_config_get_num_addresses (priv->con_ip4_config) > 0)
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+ goto clear_config;
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+
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+ /* Fail the method in case of timeout or failure during initial
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+ * configuration.
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+ */
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+ if ( !priv->dhcp4.was_active
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+ && (timeout || priv->ip4_state == IP_CONF)) {
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+ dhcp4_cleanup (self, CLEANUP_TYPE_DECONFIGURE, FALSE);
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+ nm_device_activate_schedule_ip4_config_timeout (self);
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return;
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}
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- if ( priv->dhcp4.num_tries_left == DHCP_NUM_TRIES_MAX
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- && (timeout || (priv->ip4_state == IP_CONF))
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- && !priv->dhcp4.was_active)
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- nm_device_activate_schedule_ip4_config_timeout (self);
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- else if ( priv->dhcp4.num_tries_left < DHCP_NUM_TRIES_MAX
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- || priv->ip4_state == IP_DONE
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- || priv->dhcp4.was_active) {
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- /* Don't fail immediately when the lease expires but try to
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- * restart DHCP for a predefined number of times.
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- */
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- if (priv->dhcp4.num_tries_left) {
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- priv->dhcp4.num_tries_left--;
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- dhcp_schedule_restart (self, AF_INET, "lease expired");
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- } else {
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- nm_device_ip_method_failed (self, AF_INET, NM_DEVICE_STATE_REASON_IP_CONFIG_EXPIRED);
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- /* We failed the ipv4 method but schedule again the retries if the ipv6 method is
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- * configured, keeping the connection up.
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- */
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- if (nm_device_get_state (self) != NM_DEVICE_STATE_FAILED)
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- dhcp_schedule_restart (self, AF_INET, "renewal failed");
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- }
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- } else
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- g_warn_if_reached ();
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+ /* In any other case (expired lease, assumed connection, etc.),
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+ * start a grace period in which we keep the client running,
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+ * hoping that it will regain a lease.
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+ */
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+ if (!priv->dhcp4.grace_id) {
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+ priv->dhcp4.grace_id = g_timeout_add_seconds (DHCP_GRACE_PERIOD_SEC,
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+ dhcp4_grace_period_expired,
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+ self);
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+ _LOGI (LOGD_DHCP4,
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+ "DHCPv4: %u seconds grace period started",
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+ DHCP_GRACE_PERIOD_SEC);
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+ goto clear_config;
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+ }
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+ return;
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+
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+clear_config:
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+ /* The previous configuration is no longer valid */
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+ if (priv->dhcp4.config) {
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+ nm_exported_object_clear_and_unexport (&priv->dhcp4.config);
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+ priv->dhcp4.config = nm_dhcp4_config_new ();
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+ _notify (self, PROP_DHCP4_CONFIG);
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+ }
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}
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static void
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@@ -6141,6 +6138,8 @@ dhcp4_state_changed (NMDhcpClient *client,
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break;
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}
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+ nm_clear_g_source (&priv->dhcp4.grace_id);
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+
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/* After some failures, we have been able to renew the lease:
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* update the ip state
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*/
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@@ -6153,7 +6152,6 @@ dhcp4_state_changed (NMDhcpClient *client,
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nm_dhcp4_config_set_options (priv->dhcp4.config, options);
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_notify (self, PROP_DHCP4_CONFIG);
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- priv->dhcp4.num_tries_left = DHCP_NUM_TRIES_MAX;
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if (priv->ip4_state == IP_CONF) {
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connection = nm_device_get_applied_connection (self);
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@@ -6524,7 +6522,6 @@ act_stage3_ip4_config_start (NMDevice *self,
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}
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method = nm_utils_get_ip_config_method (connection, NM_TYPE_SETTING_IP4_CONFIG);
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- priv->dhcp4.num_tries_left = DHCP_NUM_TRIES_MAX;
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/* Start IPv4 addressing based on the method requested */
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if (strcmp (method, NM_SETTING_IP4_CONFIG_METHOD_AUTO) == 0) {
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@@ -6579,7 +6576,7 @@ dhcp6_cleanup (NMDevice *self, CleanupType cleanup_type, gboolean release)
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priv->dhcp6.mode = NM_NDISC_DHCP_LEVEL_NONE;
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g_clear_object (&priv->dhcp6.ip6_config);
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g_clear_pointer (&priv->dhcp6.event_id, g_free);
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- nm_clear_g_source (&priv->dhcp6.restart_id);
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+ nm_clear_g_source (&priv->dhcp6.grace_id);
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if (priv->dhcp6.client) {
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nm_clear_g_signal_handler (priv->dhcp6.client, &priv->dhcp6.state_sigid);
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@@ -6763,53 +6760,17 @@ dhcp6_lease_change (NMDevice *self)
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}
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static gboolean
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-dhcp6_restart_cb (gpointer user_data)
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+dhcp6_grace_period_expired (gpointer user_data)
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{
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NMDevice *self = user_data;
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- NMDevicePrivate *priv;
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- g_return_val_if_fail (NM_IS_DEVICE (self), FALSE);
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-
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- priv = NM_DEVICE_GET_PRIVATE (self);
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- priv->dhcp6.restart_id = 0;
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-
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- if (!dhcp6_start (self, FALSE))
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- dhcp_schedule_restart (self, AF_INET6, NULL);
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+ _LOGI (LOGD_DHCP6, "DHCPv6: grace period expired");
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- return FALSE;
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-}
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+ nm_device_ip_method_failed (self, AF_INET6,
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+ NM_DEVICE_STATE_REASON_IP_CONFIG_EXPIRED);
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+ /* If the device didn't fail, the DHCP client will continue */
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-static void
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-dhcp_schedule_restart (NMDevice *self,
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- int addr_family,
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- const char *reason)
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-{
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- NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
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- guint tries_left;
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- char tries_str[255];
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-
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- nm_assert_addr_family (addr_family);
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-
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- tries_left = (addr_family == AF_INET)
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- ? priv->dhcp4.num_tries_left
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- : priv->dhcp6.num_tries_left;
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-
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- _LOGI ((addr_family == AF_INET) ? LOGD_DHCP4 : LOGD_DHCP6,
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- "scheduling DHCPv%c restart in %u seconds%s%s%s%s",
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- nm_utils_addr_family_to_char (addr_family),
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- DHCP_RESTART_TIMEOUT,
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- (tries_left != DHCP_NUM_TRIES_MAX)
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- ? nm_sprintf_buf (tries_str, ", %u tries left", tries_left + 1)
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- : "",
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- NM_PRINT_FMT_QUOTED (reason, " (reason: ", reason, ")", ""));
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-
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- if (addr_family == AF_INET) {
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- priv->dhcp4.restart_id = g_timeout_add_seconds (DHCP_RESTART_TIMEOUT,
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- dhcp4_restart_cb, self);
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- } else {
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- priv->dhcp6.restart_id = g_timeout_add_seconds (DHCP_RESTART_TIMEOUT,
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- dhcp6_restart_cb, self);
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- }
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+ return G_SOURCE_REMOVE;
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}
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static void
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@@ -6818,51 +6779,57 @@ dhcp6_fail (NMDevice *self, gboolean timeout)
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NMDevicePrivate *priv = NM_DEVICE_GET_PRIVATE (self);
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gboolean is_dhcp_managed;
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- _LOGD (LOGD_DHCP6, "DHCPv6 failed: timeout %d, num tries left %u",
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- timeout, priv->dhcp6.num_tries_left);
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+ _LOGD (LOGD_DHCP6, "DHCPv6 failed%s", timeout ? " (timeout)" : "");
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is_dhcp_managed = (priv->dhcp6.mode == NM_NDISC_DHCP_LEVEL_MANAGED);
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- dhcp6_cleanup (self, CLEANUP_TYPE_DECONFIGURE, FALSE);
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- if (is_dhcp_managed || priv->dhcp6.num_tries_left < DHCP_NUM_TRIES_MAX) {
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- /* Don't fail if there are static addresses configured on
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- * the device, instead retry after some time.
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+ if (is_dhcp_managed) {
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+ /* Keep client running if there are static addresses configured
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+ * on the interface.
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*/
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if ( priv->ip6_state == IP_DONE
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&& priv->con_ip6_config
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- && nm_ip6_config_get_num_addresses (priv->con_ip6_config)) {
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- dhcp_schedule_restart (self, AF_INET6, "device has IP addresses");
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+ && nm_ip6_config_get_num_addresses (priv->con_ip6_config))
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+ goto clear_config;
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+
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+ /* Fail the method in case of timeout or failure during initial
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+ * configuration.
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+ */
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+ if ( !priv->dhcp6.was_active
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+ && (timeout || priv->ip6_state == IP_CONF)) {
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+ dhcp6_cleanup (self, CLEANUP_TYPE_DECONFIGURE, FALSE);
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+ nm_device_activate_schedule_ip6_config_timeout (self);
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return;
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}
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- if ( priv->dhcp6.num_tries_left == DHCP_NUM_TRIES_MAX
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- && (timeout || (priv->ip6_state == IP_CONF))
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- && !priv->dhcp6.was_active)
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- nm_device_activate_schedule_ip6_config_timeout (self);
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- else if ( priv->dhcp6.num_tries_left < DHCP_NUM_TRIES_MAX
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- || priv->ip6_state == IP_DONE
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- || priv->dhcp6.was_active) {
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- /* Don't fail immediately when the lease expires but try to
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- * restart DHCP for a predefined number of times.
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- */
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- if (priv->dhcp6.num_tries_left) {
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- priv->dhcp6.num_tries_left--;
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- dhcp_schedule_restart (self, AF_INET6, "lease expired");
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- } else {
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- nm_device_ip_method_failed (self, AF_INET6, NM_DEVICE_STATE_REASON_IP_CONFIG_EXPIRED);
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- /* We failed the ipv6 method but schedule again the retries if the ipv4 method is
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- * configured, keeping the connection up.
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- */
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- if (nm_device_get_state (self) != NM_DEVICE_STATE_FAILED)
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- dhcp_schedule_restart (self, AF_INET6, "renewal failed");
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- }
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- } else
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- g_warn_if_reached ();
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+ /* In any other case (expired lease, assumed connection, etc.),
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+ * start a grace period in which we keep the client running,
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+ * hoping that it will regain a lease.
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+ */
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+ if (!priv->dhcp6.grace_id) {
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+ priv->dhcp6.grace_id = g_timeout_add_seconds (DHCP_GRACE_PERIOD_SEC,
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+ dhcp6_grace_period_expired,
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+ self);
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+ _LOGI (LOGD_DHCP6,
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+ "DHCPv6: %u seconds grace period started",
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+ DHCP_GRACE_PERIOD_SEC);
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+ goto clear_config;
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+ }
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} else {
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/* not a hard failure; just live with the RA info */
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+ dhcp6_cleanup (self, CLEANUP_TYPE_DECONFIGURE, FALSE);
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if (priv->ip6_state == IP_CONF)
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nm_device_activate_schedule_ip6_config_result (self);
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}
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+ return;
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+
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+clear_config:
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+ /* The previous configuration is no longer valid */
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+ if (priv->dhcp6.config) {
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+ nm_exported_object_clear_and_unexport (&priv->dhcp6.config);
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+ priv->dhcp6.config = nm_dhcp6_config_new ();
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+ _notify (self, PROP_DHCP6_CONFIG);
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+ }
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}
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static void
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@@ -6898,6 +6865,7 @@ dhcp6_state_changed (NMDhcpClient *client,
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switch (state) {
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case NM_DHCP_STATE_BOUND:
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+ nm_clear_g_source (&priv->dhcp6.grace_id);
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/* If the server sends multiple IPv6 addresses, we receive a state
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* changed event for each of them. Use the event ID to merge IPv6
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* addresses from the same transaction into a single configuration.
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@@ -6928,8 +6896,6 @@ dhcp6_state_changed (NMDhcpClient *client,
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if (priv->ip6_state == IP_FAIL)
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_set_ip_state (self, AF_INET6, IP_CONF);
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- priv->dhcp6.num_tries_left = DHCP_NUM_TRIES_MAX;
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-
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if (priv->ip6_state == IP_CONF) {
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if (priv->dhcp6.ip6_config == NULL) {
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nm_device_ip_method_failed (self, AF_INET6, NM_DEVICE_STATE_REASON_DHCP_FAILED);
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@@ -8107,8 +8073,6 @@ act_stage3_ip6_config_start (NMDevice *self,
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}
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priv->dhcp6.mode = NM_NDISC_DHCP_LEVEL_NONE;
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- priv->dhcp6.num_tries_left = DHCP_NUM_TRIES_MAX;
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-
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method = nm_utils_get_ip_config_method (connection, NM_TYPE_SETTING_IP6_CONFIG);
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if (strcmp (method, NM_SETTING_IP6_CONFIG_METHOD_IGNORE) == 0) {
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--
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2.14.3
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