Steam Deck USB Ethernet

run-mac.sh

#!/bin/sh

# Path to your usb-eth.sh script
SCRIPT_PATH="/home/deck/usb-eth.sh"

# Check if the script exists and is executable
if [ -x "$SCRIPT_PATH" ]; then
    # Run the script with sudo
    sudo "$SCRIPT_PATH" start -n
else
    echo "Error: Script not found or not executable"
    exit 1
fi

#   "Usage: in line 9. is a -n, change it out for what you need"
#    you can place this file wherever you want, but you have to run it from the desktop enviroment.
#.   i tried getting to run within steam bp but ended up giving up on it
# -n Use the CDC-NCM USB Ethernet driver (for OSX and iOS)"
# -c Use the CDC-ECM USB Ethernet driver (default)"
# -e Use the CDC-EEM USB Ethernet driver"
# -r Enable the RNDIS USB Ethernet driver for Windows (default)"
# -R Disable the RNDIS USB Ethernet driver for Windows"
#  ./usb-ether.sh stop - Stops the USB ethernet"
        

usb-ether.sh

#!/bin/sh

# Automatically elevate to root using sudo if not already root
if [ "$UID" -ne 0 ]; then
    echo "Attempting to run script with elevated privileges..."
    exec sudo "$0" "$@"
fi

vendor_id="0x3000" # Valve
product_id="0x28DE"
serial_number="$(dmidecode -s system-serial-number)" # The Steam Deck's serial number
manufacturer="Valve" # Manufacturer
product="Steam Deck" # Product
device="0x1004" # Device version
usb_version="0x0200" # USB 2.0
device_class="2" # Communications
cfg1="CDC" # Config 1 description
cfg2="RNDIS" # Config 2 description
power=250 # Max power
dev_mac1="42:61:64:55:53:42"
host_mac1="48:6f:73:74:50:43"
dev_mac2="42:61:64:55:53:44"
host_mac2="48:6f:73:74:50:45"
ms_vendor_code="0xcd" # Microsoft
ms_qw_sign="MSFT100" # Microsoft
ms_compat_id="RNDIS" # Matches Windows RNDIS drivers
ms_subcompat_id="5162001" # Matches Windows RNDIS 6.0 driver

cdc_mode="ecm" # Which CDC gadget to use
start_rndis=true # Whether to start the Microsoft RNDIS gadget

while getopts "ncerR" option ${@:2}; do
    case "${option}" in
        "n")
            cdc_mode=ncm
            ;;
        "c")
            cdc_mode=ecm
            ;;
        "e")
            cdc_mode=eem
            ;;
        "r")
            start_rndis=true
            ;;
        "R")
            start_rndis=false
            ;;
    esac
done

case "$1" in
    start)
        # Create the networkd config file for the USB interface
        cat << EOF > /etc/systemd/network/usb0.network
[Match]
Name=usb0
[Network]
Address=192.168.100.1/24
DHCPServer=yes
IPMasquerade=ipv4
[DHCPServer]
PoolOffset=10
PoolSize=50
EmitDNS=yes
DNS=8.8.8.8
EOF

        cat << EOF > /etc/systemd/network/usb1.network
[Match]
Name=usb1
[Network]
Address=192.168.101.1/24
DHCPServer=yes
IPMasquerade=ipv4
[DHCPServer]
PoolOffset=10
PoolSize=50
EmitDNS=yes
DNS=8.8.8.8
EOF

        # Start networkd
        systemctl restart systemd-networkd
        
        # Enable DRD driver
        echo -n "0000:04:00.3" > /sys/bus/pci/drivers/dwc3-pci/unbind
        echo -n "0000:04:00.3" > /sys/bus/pci/drivers/dwc3-pci/bind

        echo -n "0000:04:00.4" > /sys/bus/pci/drivers/xhci_hcd/unbind
        echo -n "0000:04:00.4" > /sys/bus/pci/drivers/xhci_hcd/bind

        # Load the drivers
        modprobe libcomposite

        # Create the gadget
        mkdir /sys/kernel/config/usb_gadget/g.1
        cd /sys/kernel/config/usb_gadget/g.1

        # Specify the vendor and product ID
        echo "${vendor_id}" > idVendor
        echo "${product_id}" > idProduct

        # Create the gadget configuration
        mkdir configs/c.1

        # Create the strings directories
        mkdir strings/0x409
        mkdir configs/c.1/strings/0x409

        # Specify the serial number, manufacturer, and product strings
        echo "${serial_number}" > strings/0x409/serialnumber
        echo "${manufacturer}" > strings/0x409/manufacturer
        echo "${product}" > strings/0x409/product

        # Specify the device version, USB specification, and device class
        echo "${device}" > bcdDevice
        echo "${usb_version}" > bcdUSB
        echo "${device_class}" > bDeviceClass

        # Set the configuration description and power
        echo "${cfg1}" > configs/c.1/strings/0x409/configuration
        echo "${power}" > configs/c.1/MaxPower

        # Create the gadget function
        mkdir functions/${cdc_mode}.0

        # Set the MAC addresses of the gadget
        echo "${host_mac1}" > functions/${cdc_mode}.0/host_addr
        echo "${dev_mac1}" > functions/${cdc_mode}.0/dev_addr

        # Start RNDIS if enabled
        if [ "${start_rndis}" = true ]; then
            # Create the gadget configuration
            mkdir configs/c.2

            # Create the strings directories
            mkdir configs/c.2/strings/0x409

            # Specify the configuration description and power
            echo "${cfg2}" > configs/c.2/strings/0x409/configuration
            echo "${power}" > configs/c.2/MaxPower

            # Set some Microsoft specific configuration
            echo "1" > os_desc/use
            echo "${ms_vendor_code}" > os_desc/b_vendor_code
            echo "${ms_qw_sign}" > os_desc/qw_sign

            # Create the gadget function
            mkdir functions/rndis.0

            # Set the MAC addresses of the gadget
            echo "${host_mac2}" > functions/rndis.0/host_addr
            echo "${dev_mac2}" > functions/rndis.0/dev_addr

            # Set the RNDIS driver version
            echo "${ms_compat_id}" > functions/rndis.0/os_desc/interface.rndis/compatible_id
            echo "${ms_subcompat_id}" > functions/rndis.0/os_desc/interface.rndis/sub_compatible_id
        fi

        # Associate the CDC function with its configuration
        ln -s functions/${cdc_mode}.0 configs/c.1/

        # Associate the RNDIS function with its configuration
        if [ "${start_rndis}" = true ]; then
            ln -s functions/rndis.0 configs/c.2
            ln -s configs/c.2 os_desc
        fi

        # Enable the gadget
        ls /sys/class/udc > UDC

        # Open DHCP ports in the firewall
        firewall-cmd --add-port=67/udp --permanent
        firewall-cmd --add-port=68/udp --permanent
        firewall-cmd --reload
        ;;

    stop)
        # Disable the gadget
        cd /sys/kernel/config/usb_gadget/g.1
        echo "" > UDC

        # Remove functions from the configuration
        rm configs/c.1/ncm.0 2> /dev/null
        rm configs/c.1/ecm.0 2> /dev/null
        rm configs/c.1/eem.0 2> /dev/null
        rm configs/c.2/rndis.0 2> /dev/null

        # Remove the strings directories in configurations
        rmdir configs/c.1/strings/0x409
        rmdir configs/c.2/strings/0x409 2> /dev/null

        # Remove the configurations
        rmdir configs/c.1
        rm os_desc/c.2 2> /dev/null
        rmdir configs/c.2 2> /dev/null

        # Remove the functions
        rmdir functions/ncm.0 2> /dev/null
        rmdir functions/ecm.0 2> /dev/null
        rmdir functions/eem.0 2> /dev/null
        rmdir functions/rndis.0 2> /dev/null

        # Remove the strings directories in the gadget
        rmdir strings/0x409

        # Delete the gadget
        cd ..
        rmdir g.1

        # Unload the drivers
        cd ../../
        modprobe -r usb_f_ncm
        modprobe -r usb_f_ecm
        modprobe -r usb_f_eem
        modprobe -r usb_f_rndis
        modprobe -r libcomposite
        
        # Re-bind the PCI devices
        echo -n "0000:04:00.3" > /sys/bus/pci/drivers/dwc3-pci/unbind
        echo -n "0000:04:00.3" > /sys/bus/pci/drivers/dwc3-pci/bind

        echo -n "0000:04:00.4" > /sys/bus/pci/drivers/xhci_hcd/unbind
        echo -n "0000:04:00.4" > /sys/bus/pci/drivers/xhci_hcd/bind

        # Stop networkd
        systemctl stop systemd-networkd 2> /dev/null

        # Remove the networkd config files for USB interfaces
        rm /etc/systemd/network/usb0.network
        rm /etc/systemd/network/usb1.network

        # Remove the firewall rules for DHCP ports
        firewall-cmd --remove-port=67/udp --permanent
        firewall-cmd --remove-port=68/udp --permanent
        firewall-cmd --reload
        ;;
    *)
        echo "Usage:"
        echo -e "\t./usb-ether.sh start\tStarts the USB ethernet"
        echo -e "\t\t-n\tUse the CDC-NCM USB Ethernet driver (for OSX and iOS)"
        echo -e "\t\t-c\tUse the CDC-ECM USB Ethernet driver (default)"
        echo -e "\t\t-e\tUse the CDC-EEM USB Ethernet driver"
        echo -e "\t\t-r\tEnable the RNDIS USB Ethernet driver for Windows (default)"
        echo -e "\t\t-R\tDisable the RNDIS USB Ethernet driver for Windows"
        echo -e "\t./usb-ether.sh stop - Stops the USB ethernet"
        ;;
esac

updated mac section to work correctly with mac, updated dhcp server to be more consistant even if link is unstable

fixed firewall stuff