From fcddd1b6c3b2924a8a022caf183b8f186e7d5cae Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Mon, 25 Jun 2018 17:00:21 +0800
Subject: [PATCH] eventhandler: Implement ifnet_event

Implement the "ifnet_event" which is triggered on interface up and down.

Taken-from: FreeBSD
---
 share/man/man9/EVENTHANDLER.9 | 4 +++-
 sys/net/if.c                  | 2 ++
 sys/net/if_var.h              | 5 +++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/share/man/man9/EVENTHANDLER.9 b/share/man/man9/EVENTHANDLER.9
index 7516f87ad3..1da5c05105 100644
--- a/share/man/man9/EVENTHANDLER.9
+++ b/share/man/man9/EVENTHANDLER.9
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD: src/share/man/man9/EVENTHANDLER.9,v 1.4 2005/10/11 16:05:35 keramida Exp $
 .\"
-.Dd June 22, 2018
+.Dd June 25, 2018
 .Dt EVENTHANDLER 9
 .Os
 .Sh NAME
@@ -204,6 +204,8 @@ Callbacks invoked when an address is set up on a network interface.
 Callbacks invoked when a new network interface appears.
 .It Vt ifnet_detach_event
 Callbacks invoked when a network interface is removed.
+.It Vt ifnet_event
+Callbacks invoked when a network interface is brought up or down.
 .It Vt power_profile_change
 Callbacks invoked when the power profile of the system changes.
 .It Vt shutdown_pre_sync
diff --git a/sys/net/if.c b/sys/net/if.c
index fdb7db80cd..f2157f8022 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -1764,6 +1764,7 @@ if_route(struct ifnet *ifp, int flag, int fam)
 void
 if_down(struct ifnet *ifp)
 {
+	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_DOWN);
 	if_unroute(ifp, IFF_UP, AF_UNSPEC);
 	netmsg_service_sync();
 }
@@ -1777,6 +1778,7 @@ void
 if_up(struct ifnet *ifp)
 {
 	if_route(ifp, IFF_UP, AF_UNSPEC);
+	EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_UP);
 }
 
 /*
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index 06f79303ac..9ee015d14b 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -717,6 +717,11 @@ EVENTHANDLER_DECLARE(ifnet_attach_event, ifnet_attach_event_handler_t);
 /* interface detach event */
 typedef void (*ifnet_detach_event_handler_t)(void *, struct ifnet *);
 EVENTHANDLER_DECLARE(ifnet_detach_event, ifnet_detach_event_handler_t);
+/* Interface up/down event */
+#define IFNET_EVENT_UP		0
+#define IFNET_EVENT_DOWN	1
+typedef void (*ifnet_event_fn)(void *, struct ifnet *ifp, int event);
+EVENTHANDLER_DECLARE(ifnet_event, ifnet_event_fn);
 
 /* Array of all ifnets in the system */
 struct ifnet_array {
-- 
2.41.0