On Tue, Jun 19, 2018 at 2:52 AM, Samuel Mendoza-Jonas
<[email protected]> wrote:
> 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

Please explain "wait_for_ipv6_default_route" logic.
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