File a1f46c71-restrict-IPv6-RA-routes-check.patch of Package libvirt.6159

From a1f46c71a4307f1b8be93793e469e6467455d56d Mon Sep 17 00:00:00 2001
From: Laine Stump <laine@laine.org>
Date: Thu, 23 Mar 2017 20:18:25 -0400
Subject: [PATCH] network: only check for IPv6 RA routes when the network has
 an IPv6 address

commit 00d28a78 added a check to see if there were any IPv6 routes
added by RA (Router Advertisement) via an interface that had accept_ra
set to something other than "2". The check was being done
unconditionally, but it's only relevant if IPv6 forwarding is going to
be turned on, and that will only happen if the network has an IPv6
address.
---
 src/network/bridge_driver.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 875c6f650..3a7a249a0 100644
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -2391,10 +2391,9 @@ networkStartNetworkVirtual(virNetworkDriverStatePtr driver,
 
     /* If forward.type != NONE, turn on global IP forwarding */
     if (network->def->forward.type != VIR_NETWORK_FORWARD_NONE) {
-        if (!virNetDevIPCheckIPv6Forwarding())
+        if (v6present && !virNetDevIPCheckIPv6Forwarding())
             goto err3; /* Precise error message already provided */
 
-
         if (networkEnableIPForwarding(v4present, v6present) < 0) {
             virReportSystemError(errno, "%s",
                                  _("failed to enable IP forwarding"));
-- 
2.12.0