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#!/bin/bash
mac_config="/usr/share/mac-address/config.txt"
dev_mac_path="/tmp/usb0_dev"
host_mac_path="/tmp/usb0_host"
check_usb_local_administered() {
is_enable="$(cat ${mac_config} | grep 'USBLAA')"
echo "${is_enable}"
}
# Set the locally administered bit (the second least-significant
# bit of the first octet) of the MAC address
set_local_administered_bit() {
mac="$(tr -d '\0' < "$1")"
first_byte="${mac:0:2}"
first_byte="$((0x$first_byte|2))"
first_byte="$(printf "%02x\n" "$first_byte")"
mac="${first_byte}${mac:2}"
echo "$mac"
}
cd /sys/kernel/config/usb_gadget || exit 1
if [ ! -f "g1" ]; then
mkdir g1
cd g1 || exit 1
echo 0x1d6b > idVendor # Linux foundation
echo 0x0104 > idProduct # Multifunction composite gadget
mkdir -p strings/0x409
echo "Linux" > strings/0x409/manufacturer
echo "Etherned/ECM gadget" > strings/0x409/product
mkdir -p configs/c.1
echo 100 > configs/c.1/MaxPower
mkdir -p configs/c.1/strings/0x409
echo "ECM" > configs/c.1/strings/0x409/configuration
if [[ $(check_usb_local_administered) == "USBLAA=true" ]]; then
dev_mac="$(set_local_administered_bit $dev_mac_path)"
host_mac="$(set_local_administered_bit $host_mac_path)"
echo "$dev_mac" > $dev_mac_path
echo "$host_mac" > $host_mac_path
fi
mkdir -p functions/ecm.usb0
cat $dev_mac_path > functions/ecm.usb0/dev_addr # write device mac address
cat $host_mac_path > functions/ecm.usb0/host_addr # write usb mac address
ln -s functions/ecm.usb0 configs/c.1
echo "$UDC" > UDC
rm $dev_mac_path
rm $host_mac_path
fi
exit 0
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