Fix #319: add missing HOOK_NETWORK_DN

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

doc/plugins.md

@@ -166,6 +166,9 @@ requirements, and possibilities, of hook scripts.
 
 ### Shutdown Hooks
 
+* `HOOK_NETWORK_DN`, `hook/net/down`: Called right after having changed
+  to runlevel 6, or 0, when all services have received their 'stop' signal.
+
 * `HOOK_SHUTDOWN`, `hook/sys/shutdown`: Called at shutdown/reboot, right
   before all services are sent `SIGTERM`
 

src/helpers.c

@@ -560,6 +560,9 @@ done:
 	if (updown) {
 		dbg("Calling all network up hooks ...");
 		plugin_run_hooks(HOOK_NETWORK_UP);
+	} else {
+		dbg("Calling all network down hooks ...");
+		plugin_run_hooks(HOOK_NETWORK_DN);
 	}
 }
 

src/plugin.h

@@ -81,6 +81,7 @@
 	CHOOSE(HOOK_RUNLEVEL_CHANGE, "nop"),			\
 								\
 	/* Shutdown hooks, runlevel [06] */			\
+	CHOOSE(HOOK_NETWORK_DN,      "hook/net/down"),		\
 	CHOOSE(HOOK_SHUTDOWN,        "hook/sys/shutdown"),	\
 	CHOOSE(HOOK_SVC_DN,          "hook/svc/down"),		\
 	CHOOSE(HOOK_SYS_DN,          "hook/sys/down"),		\