From a8accffb95267490b50401c8b65ec18db57b5ef5 Mon Sep 17 00:00:00 2001
From: Nate Karstens <nate.karstens@garmin.com>
Date: Wed, 9 Aug 2017 09:16:58 -0500
Subject: [PATCH 7/8] Mark deleted interfaces as being changed

Netlink notification handling ignores messages for deleted links,
RTM_DELLINK. It does handle RTM_GETLINK. According to libnl docu-
mentation (http://www.infradead.org/~tgr/libnl/doc/route.html)
RTM_DELLINK can be sent by the kernel, but RTM_GETLINK cannot.
There was likely a mixup in the original implementation, so this
change replaces handling for RTM_GETLINK with RTM_DELLINK.

Testing and Verification Instructions:
  1. Use ip-link to add and remove a VLAN interface and verify
     that mDNSResponder handles the deleted link.

Upstream-Status: Submitted [dts@apple.com]

Signed-off-by: Nate Karstens <nate.karstens@garmin.com>
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
---
 mDNSPosix/mDNSPosix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mDNSPosix/mDNSPosix.c
+++ b/mDNSPosix/mDNSPosix.c
@@ -1714,7 +1714,7 @@ mDNSlocal void          ProcessRoutingNo
 #endif
 
         // Process the NetLink message
-        if (pNLMsg->nlmsg_type == RTM_GETLINK || pNLMsg->nlmsg_type == RTM_NEWLINK)
+        if (pNLMsg->nlmsg_type == RTM_DELLINK || pNLMsg->nlmsg_type == RTM_NEWLINK)
             AddInterfaceIndexToList(changedInterfaces, ((struct ifinfomsg*) NLMSG_DATA(pNLMsg))->ifi_index);
         else if (pNLMsg->nlmsg_type == RTM_DELADDR || pNLMsg->nlmsg_type == RTM_NEWADDR)
             AddInterfaceIndexToList(changedInterfaces, ((struct ifaddrmsg*) NLMSG_DATA(pNLMsg))->ifa_index);
