1#!/bin/bash 2 3mac_config="/usr/share/mac-address/config.txt" 4dev_mac_path="/tmp/usb0_dev" 5host_mac_path="/tmp/usb0_host" 6 7check_usb_local_administered() { 8 is_enable="$(cat ${mac_config} | grep 'USBLAA')" 9 echo "${is_enable}" 10} 11 12# Set the locally administered bit (the second least-significant 13# bit of the first octet) of the MAC address 14set_local_administered_bit() { 15 mac="$(tr -d '\0' < "$1")" 16 first_byte="${mac:0:2}" 17 first_byte="$((0x$first_byte|2))" 18 first_byte="$(printf "%02x\n" "$first_byte")" 19 mac="${first_byte}${mac:2}" 20 echo "$mac" 21} 22 23cd /sys/kernel/config/usb_gadget || exit 1 24 25if [ ! -f "g1" ]; then 26 mkdir g1 27 cd g1 || exit 1 28 29 echo 0x1d6b > idVendor # Linux foundation 30 echo 0x0104 > idProduct # Multifunction composite gadget 31 mkdir -p strings/0x409 32 echo "Linux" > strings/0x409/manufacturer 33 echo "Etherned/ECM gadget" > strings/0x409/product 34 35 mkdir -p configs/c.1 36 echo 100 > configs/c.1/MaxPower 37 mkdir -p configs/c.1/strings/0x409 38 echo "ECM" > configs/c.1/strings/0x409/configuration 39 40 41 if [[ $(check_usb_local_administered) == "USBLAA=true" ]]; then 42 dev_mac="$(set_local_administered_bit $dev_mac_path)" 43 host_mac="$(set_local_administered_bit $host_mac_path)" 44 echo "$dev_mac" > $dev_mac_path 45 echo "$host_mac" > $host_mac_path 46 fi 47 48 mkdir -p functions/ecm.usb0 49 cat $dev_mac_path > functions/ecm.usb0/dev_addr # write device mac address 50 cat $host_mac_path > functions/ecm.usb0/host_addr # write usb mac address 51 52 ln -s functions/ecm.usb0 configs/c.1 53 54 echo "$UDC" > UDC 55 56 rm $dev_mac_path 57 rm $host_mac_path 58 59fi 60 61exit 0 62