networkd: implement Type=notify-reload protocol

src/network/networkd-manager-bus.c

@@ -197,7 +197,6 @@ static int bus_method_reconfigure_link(sd_bus_message *message, void *userdata,
 
 static int bus_method_reload(sd_bus_message *message, void *userdata, sd_bus_error *error) {
         Manager *manager = userdata;
-        Link *link;
         int r;
 
         r = bus_verify_polkit_async(message, CAP_NET_ADMIN,
@@ -209,20 +208,10 @@ static int bus_method_reload(sd_bus_message *message, void *userdata, sd_bus_err
         if (r == 0)
                 return 1; /* Polkit will call us back */
 
-        r = netdev_load(manager, true);
+        r = manager_reload(manager);
         if (r < 0)
                 return r;
 
-        r = network_reload(manager);
-        if (r < 0)
-                return r;
-
-        HASHMAP_FOREACH(link, manager->links_by_index) {
-                r = link_reconfigure(link, /* force = */ false);
-                if (r < 0)
-                        return r;
-        }
-
         return sd_bus_reply_method_return(message, NULL);
 }
 

src/network/networkd-manager.c

@@ -474,6 +474,14 @@ static int signal_restart_callback(sd_event_source *s, const struct signalfd_sig
         return sd_event_exit(sd_event_source_get_event(s), 0);
 }
 
+static int signal_reload_callback(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
+        Manager *m = ASSERT_PTR(userdata);
+
+        manager_reload(m);
+
+        return 0;
+}
+
 static int manager_set_keep_configuration(Manager *m) {
         int r;
 
@@ -508,12 +516,11 @@ int manager_setup(Manager *m) {
         if (r < 0)
                 return r;
 
-        assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGINT, SIGTERM, SIGUSR2, -1) >= 0);
-
         (void) sd_event_set_watchdog(m->event, true);
-        (void) sd_event_add_signal(m->event, NULL, SIGTERM, signal_terminate_callback, m);
-        (void) sd_event_add_signal(m->event, NULL, SIGINT, signal_terminate_callback, m);
-        (void) sd_event_add_signal(m->event, NULL, SIGUSR2, signal_restart_callback, m);
+        (void) sd_event_add_signal(m->event, NULL, SIGTERM | SD_EVENT_SIGNAL_PROCMASK, signal_terminate_callback, m);
+        (void) sd_event_add_signal(m->event, NULL, SIGINT | SD_EVENT_SIGNAL_PROCMASK, signal_terminate_callback, m);
+        (void) sd_event_add_signal(m->event, NULL, SIGUSR2 | SD_EVENT_SIGNAL_PROCMASK, signal_restart_callback, m);
+        (void) sd_event_add_signal(m->event, NULL, SIGHUP | SD_EVENT_SIGNAL_PROCMASK, signal_reload_callback, m);
 
         r = sd_event_add_post(m->event, NULL, manager_dirty_handler, m);
         if (r < 0)
@@ -1069,3 +1076,34 @@ int manager_set_timezone(Manager *m, const char *tz) {
 
         return 0;
 }
+
+int manager_reload(Manager *m) {
+        Link *link;
+        int r;
+
+        assert(m);
+
+        (void) sd_notifyf(/* unset= */ false,
+                          "RELOADING=1\n"
+                          "STATUS=Reloading configuration...\n"
+                          "MONOTONIC_USEC=" USEC_FMT, now(CLOCK_MONOTONIC));
+
+        r = netdev_load(m, /* reload= */ true);
+        if (r < 0)
+                goto finish;
+
+        r = network_reload(m);
+        if (r < 0)
+                goto finish;
+
+        HASHMAP_FOREACH(link, m->links_by_index) {
+                r = link_reconfigure(link, /* force = */ false);
+                if (r < 0)
+                        goto finish;
+        }
+
+        r = 0;
+finish:
+        (void) sd_notify(/* unset= */ false, NOTIFY_READY);
+        return r;
+}

src/network/networkd-manager.h

@@ -115,4 +115,6 @@ int manager_enumerate(Manager *m);
 int manager_set_hostname(Manager *m, const char *hostname);
 int manager_set_timezone(Manager *m, const char *timezone);
 
+int manager_reload(Manager *m);
+
 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free);

src/network/networkd.c

@@ -81,8 +81,6 @@ static int run(int argc, char *argv[]) {
         if (r < 0)
                 log_warning_errno(r, "Could not create runtime directory 'lldp': %m");
 
-        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, -1) >= 0);
-
         r = manager_new(&m, /* test_mode = */ false);
         if (r < 0)
                 return log_error_errno(r, "Could not create manager: %m");

units/systemd-networkd.service.in

@@ -24,7 +24,6 @@ BusName=org.freedesktop.network1
 CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW
 DeviceAllow=char-* rw
 ExecStart=!!{{ROOTLIBEXECDIR}}/systemd-networkd
-ExecReload=networkctl reload
 FileDescriptorStoreMax=512
 LockPersonality=yes
 MemoryDenyWriteExecute=yes
@@ -48,7 +47,7 @@ RuntimeDirectoryPreserve=yes
 SystemCallArchitectures=native
 SystemCallErrorNumber=EPERM
 SystemCallFilter=@system-service
-Type=notify
+Type=notify-reload
 User=systemd-network
 {{SERVICE_WATCHDOG}}