File nm-dhcp-use-valid-lease-on-timeout.patch of Package NetworkManager

From c308fc8823f238e07ff914bb635f9e729b84c716 Mon Sep 17 00:00:00 2001
From: Jonathan Kang <jonathankang@gnome.org>
Date: Thu, 8 Apr 2021 10:21:49 +0800
Subject: [PATCH] dhcp-client: Support using valid lease configuration on
 timeout

dhclient checks lease file on timeout. If they are still valid, the ip
configs will be used. While currently NetworkManager directly fails
the dhcp configuration once timeout is reached.

Fix that by using ip configs found in the valid lease file on timeout,
when dhclient is the dhcp backend.

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/682
---
 src/core/devices/nm-device.c      |  7 ++-----
 src/core/dhcp/nm-dhcp-client.c    | 13 ++++++++-----
 src/core/dhcp/nm-dhcp-dhcpcanon.c |  1 +
 src/core/dhcp/nm-dhcp-dhcpcd.c    |  1 +
 4 files changed, 12 insertions(+), 10 deletions(-)

Index: NetworkManager-1.32.0/src/core/devices/nm-device.c
===================================================================
--- NetworkManager-1.32.0.orig/src/core/devices/nm-device.c
+++ NetworkManager-1.32.0/src/core/devices/nm-device.c
@@ -9342,6 +9342,7 @@ dhcp4_state_changed(NMDhcpClient *client
     switch (state) {
     case NM_DHCP_STATE_BOUND:
     case NM_DHCP_STATE_EXTENDED:
+    case NM_DHCP_STATE_TIMEOUT:
         if (!ip4_config) {
             _LOGW(LOGD_DHCP4, "failed to get IPv4 config in response to DHCP event.");
             dhcp4_fail(self, state);
@@ -9388,9 +9389,6 @@ dhcp4_state_changed(NMDhcpClient *client
                 dhcp4_fail(self, state);
         }
         break;
-    case NM_DHCP_STATE_TIMEOUT:
-        dhcp4_fail(self, state);
-        break;
     case NM_DHCP_STATE_EXPIRE:
         /* Ignore expiry before we even have a lease (NAK, old lease, etc) */
         if (priv->ip_state_4 == NM_DEVICE_IP_STATE_CONF)
Index: NetworkManager-1.32.0/src/core/dhcp/nm-dhcp-client.c
===================================================================
--- NetworkManager-1.32.0.orig/src/core/dhcp/nm-dhcp-client.c
+++ NetworkManager-1.32.0/src/core/dhcp/nm-dhcp-client.c
@@ -20,6 +20,7 @@
 
 #include "NetworkManagerUtils.h"
 #include "nm-utils.h"
+#include "nm-dhcp-manager.h"
 #include "nm-dhcp-utils.h"
 #include "nm-dhcp-options.h"
 #include "libnm-platform/nm-platform.h"
@@ -446,14 +447,14 @@ nm_dhcp_client_set_state(NMDhcpClient *s
     if (NM_IN_SET(new_state, NM_DHCP_STATE_BOUND, NM_DHCP_STATE_EXTENDED)) {
         g_return_if_fail(NM_IS_IP_CONFIG_ADDR_FAMILY(ip_config, priv->addr_family));
         g_return_if_fail(options);
-    } else {
+    } else if (!NM_IN_SET (new_state, NM_DHCP_STATE_TIMEOUT)) {
         g_return_if_fail(!ip_config);
         g_return_if_fail(!options);
     }
 
     if (new_state >= NM_DHCP_STATE_BOUND)
         timeout_cleanup(self);
-    if (new_state >= NM_DHCP_STATE_TIMEOUT)
+    if (new_state >= NM_DHCP_STATE_TIMEOUT && !ip_config)
         watch_cleanup(self);
 
     /* The client may send same-state transitions for RENEW/REBIND events and
@@ -552,8 +553,6 @@ nm_dhcp_client_watch_child(NMDhcpClient
     g_return_if_fail(priv->pid == -1);
     priv->pid = pid;
 
-    nm_dhcp_client_start_timeout(self);
-
     g_return_if_fail(priv->watch_id == 0);
     priv->watch_id = g_child_watch_add(pid, daemon_watch_cb, self);
 }
@@ -898,7 +897,9 @@ nm_dhcp_client_handle_event(gpointer
     if (new_state == NM_DHCP_STATE_NOOP)
         return TRUE;
 
-    if (NM_IN_SET(new_state, NM_DHCP_STATE_BOUND, NM_DHCP_STATE_EXTENDED)) {
+    if (NM_IN_SET(new_state, NM_DHCP_STATE_BOUND, NM_DHCP_STATE_EXTENDED)
+        || (NM_IN_SET (new_state, NM_DHCP_STATE_TIMEOUT)
+           && g_strcmp0 (nm_dhcp_manager_get_config (nm_dhcp_manager_get ()), "dhclient") == 0)) {
         GVariantIter iter;
         const char * name;
         GVariant *   value;
Index: NetworkManager-1.32.0/src/core/dhcp/nm-dhcp-dhcpcanon.c
===================================================================
--- NetworkManager-1.32.0.orig/src/core/dhcp/nm-dhcp-dhcpcanon.c
+++ NetworkManager-1.32.0/src/core/dhcp/nm-dhcp-dhcpcanon.c
@@ -156,6 +156,7 @@ dhcpcanon_start(NMDhcpClient *client,
     nm_assert(pid > 0);
     _LOGI("dhcpcanon started with pid %d", pid);
     nm_dhcp_client_watch_child(client, pid);
+    nm_dhcp_client_start_timeout(self);
     priv->pid_file = g_steal_pointer(&pid_file);
     return TRUE;
 }
Index: NetworkManager-1.32.0/src/core/dhcp/nm-dhcp-dhcpcd.c
===================================================================
--- NetworkManager-1.32.0.orig/src/core/dhcp/nm-dhcp-dhcpcd.c
+++ NetworkManager-1.32.0/src/core/dhcp/nm-dhcp-dhcpcd.c
@@ -155,6 +155,7 @@ ip4_start(NMDhcpClient *client, const ch
     nm_assert(pid > 0);
     _LOGI("dhcpcd started with pid %d", pid);
     nm_dhcp_client_watch_child(client, pid);
+    nm_dhcp_client_start_timeout(self);
     return TRUE;
 }