[OE-core] busybox: udhcpc: fix IPv6 support when using udhcpc
stefan at agner.ch
Mon Jan 20 12:57:36 UTC 2020
On 2020-01-20 13:32, Quentin Schulz wrote:
> Hi all,
> On Mon, Jan 13, 2020 at 03:57:31PM +0100, Quentin Schulz wrote:
>> Hi all,
>> On Mon, May 14, 2018 at 04:44:15PM +0200, Stefan Agner wrote:
>> > From: Stefan Agner <stefan.agner at toradex.com>
>> > The udhcpc script calls ip addr flush .. which flushes addresses
>> > of any address family, including IPv6. However, busybox udhcpc is
>> > IPv4 only and should not influence IPv6 addressing. Hence use ip
>> > addr flush with family constrait.
>> > The script particularly broke IPv6 SLAAC: Typically when udhcpc
>> > calls the script the kernel already assigned the IPv6 link-local
>> > address. The flush removes the link-local IPv6 address again and
>> > prohibits proper IPv6 operation such as SLAAC since neighbor
>> > discovery protocol relies on IPv6 link-local addressing.
>> > Signed-off-by: Stefan Agner <stefan.agner at toradex.com>
>> > ---
>> > meta/recipes-core/busybox/files/simple.script | 2 +-
>> > 1 file changed, 1 insertion(+), 1 deletion(-)
>> > diff --git a/meta/recipes-core/busybox/files/simple.script b/meta/recipes-core/busybox/files/simple.script
>> > index 6ed0293525..8b5eb53633 100644
>> > --- a/meta/recipes-core/busybox/files/simple.script
>> > +++ b/meta/recipes-core/busybox/files/simple.script
>> > @@ -28,7 +28,7 @@ case "$1" in
>> > fi
>> > if ! root_is_nfs ; then
>> > if [ $have_bin_ip -eq 1 ]; then
>> > - /SBIN_DIR/ip addr flush dev $interface
>> > + /SBIN_DIR/ip -4 addr flush dev $interface
>> > /SBIN_DIR/ip link set dev $interface up
>> > else
>> > /SBIN_DIR/ifconfig $interface 0.0.0.0
>> Kindly pinging, happened to us as well many times.
> Kindly pinging.
Just checked, we still override that script in our layer, so definitely
would be happy if this gets merged upstream so I can get rid of our
custom script downstream.
More information about the Openembedded-core