udhcpc6 will call the default script with the address set in the "ipv6"
variable. Set "ip" to this address if present.

Also from Rob, if handling a DHCPv6 address wait a moment for the IPv6
route to be configured; this doesn't come from DHCPv6 but rather the
IPv6 Router Advertisement (RA).

(wait for IPv6 route)
From: Robert Lippert <[email protected]>
Signed-off-by: Samuel Mendoza-Jonas <[email protected]>
---
v2: Avoid bashisms

 package/busybox/udhcpc.script | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/package/busybox/udhcpc.script b/package/busybox/udhcpc.script
index ad110d3a7f..65114b6cd0 100755
--- a/package/busybox/udhcpc.script
+++ b/package/busybox/udhcpc.script
@@ -8,6 +8,16 @@ RESOLV_CONF="/etc/resolv.conf"
 [ -e $RESOLV_CONF ] || touch $RESOLV_CONF
 [ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
 [ -n "$subnet" ] && NETMASK="netmask $subnet"
+[ -n "$ipv6" ] && ip="$ipv6/128"
+
+wait_for_ipv6_default_route() {
+       attempts=10
+       while [ $attempts != 0 ] && [ -z "$(ip -6 route list | grep default)" ] 
; do
+               sleep 1
+               attempts=$(($attempts-1))
+       done
+       [ $attempts = 0 ] && echo "failed to get default ipv6 route"
+}
 
 case "$1" in
        deconfig)
@@ -37,6 +47,10 @@ case "$1" in
                        /usr/sbin/avahi-autoipd -k $interface
                fi
                /sbin/ifconfig $interface $ip $BROADCAST $NETMASK
+               if [ -n "$ipv6" ] ; then
+                       echo "waiting for default ipv6 route set"
+                       wait_for_ipv6_default_route
+               fi
 
                if [ -n "$router" ] ; then
                        echo "deleting routers"
-- 
2.17.1

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