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fix(usb): stable gadget MAC so the host NIC keeps one MAC across reboots #828

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fix(usb): stable gadget MAC so the host NIC keeps one MAC across reboots #828

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15 changes: 15 additions & 0 deletions kvmapp/system/init.d/S03usbdev
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Original file line number Diff line number Diff line change
Expand Up @@ -39,15 +39,30 @@ start_usb_dev(){
mkdir configs/c.1/strings/0x409
echo "NanoKVM" > configs/c.1/strings/0x409/configuration

# Deterministic gadget MACs from the chip UID so the host-side RNDIS/NCM
# interface keeps a STABLE MAC across re-enumeration/reboot. Without this
# the kernel assigns a random dev_addr/host_addr on every bind, so the
# attached PC sees a brand-new network adapter (and MAC) each time.
usb_uid=$(sha512sum /sys/class/cvi-base/base_uid | head -c 4)
if [ -n "$usb_uid" ]
then
usb_dev_mac="48:da:35:6e:${usb_uid%??}:${usb_uid#??}"
usb_host_mac="48:da:35:6d:${usb_uid%??}:${usb_uid#??}"
fi

if [ -e /boot/usb.ncm ]
then
mkdir functions/ncm.usb0
[ -n "$usb_dev_mac" ] && echo "$usb_dev_mac" > functions/ncm.usb0/dev_addr
[ -n "$usb_host_mac" ] && echo "$usb_host_mac" > functions/ncm.usb0/host_addr
echo WINNCM > functions/ncm.usb0/os_desc/interface.ncm/compatible_id
ln -s functions/ncm.usb0 configs/c.1/
else
if [ -e /boot/usb.rndis0 ]
then
mkdir functions/rndis.usb0
[ -n "$usb_dev_mac" ] && echo "$usb_dev_mac" > functions/rndis.usb0/dev_addr
[ -n "$usb_host_mac" ] && echo "$usb_host_mac" > functions/rndis.usb0/host_addr
echo e0 > functions/rndis.usb0/class
echo 01 > functions/rndis.usb0/subclass
echo 03 > functions/rndis.usb0/protocol
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