[OE-core] [PATCH] busybox: udhcpc: fix IPv6 support when using udhcpc
Stefan Agner
stefan at agner.ch
Mon Jun 24 12:24:43 UTC 2019
Hi,
Any comment on this patch? Just stumbled upon that problem today again
:-)
--
Stefan
On 14.05.2018 16:44, 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
> --
> 2.13.6
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