ipv6: wait for all global IPv6 addresses to leave the "tentative" state

Cherry-picked from: c188044
Resolves: #1245951

2 files changed, 23 insertions, 0 deletions

diff --git a/sysconfig/network-scripts/ifup-ipv6 b/sysconfig/network-scripts/ifup-ipv6
index 31b3b64c..e688422f 100755
--- a/sysconfig/network-scripts/ifup-ipv6
+++ b/sysconfig/network-scripts/ifup-ipv6
@@ -301,3 +301,5 @@ if [ "$IPV6TO4INIT" = "yes" ]; then
         fi
 fi
 
+#wait for all global IPv6 addresses to leave the "tentative" state
+ipv6_wait_tentative $DEVICE
diff --git a/sysconfig/network-scripts/network-functions-ipv6 b/sysconfig/network-scripts/network-functions-ipv6
index 394367bb..079a055f 100644
--- a/sysconfig/network-scripts/network-functions-ipv6
+++ b/sysconfig/network-scripts/network-functions-ipv6
@@ -1042,3 +1042,24 @@ ipv6_trigger_radvd() {
 
 	return 0
 }
+
+#https://www.vaspects.com/2013/12/11/services-dont-bind-to-ipv6-address/
+ipv6_wait_tentative() {
+        local fn="ipv6_wait_tentative"
+        local device=$1
+        local countdown=30
+
+        if [ -z "$device" ]; then
+                net_log $"Missing parameter 'device' (arg 1)" err $fn
+                return 1
+        fi
+
+        [ "$device" = lo ] && return 0
+
+        while [ ${countdown} -gt 0 -a -n "$(ip -6 addr show dev ${device} scope global tentative)" ]; do
+                net_log $"Waiting for interface ${device} IPv6 address(es) to leave the \"tentative\" state" info $fn
+                countdown=$(($countdown - 1))
+                sleep 1
+        done
+        return 0
+}