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#!/bin/bash
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# Copyright 2021 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# List of options the script accepts. Trailing column means that the option
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# requires an argument.
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ARGUMENT_LIST=(
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"help"
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"product-id:"
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"product-name:"
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"host-mac:"
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"bind-device:"
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"dev-mac:"
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"dev-type:"
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"gadget-dir-name:"
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"iface-name:"
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)
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print_usage() {
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cat <<HELP
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$0 [OPTIONS] [stop|start]
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Create USB Gadget Configuration
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--product-id USB Product Id for the gadget.
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--product-name Product name string (en) for the gadget.
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--host-mac MAC address of the host part of the connection. Optional.
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--dev-mac MAC address of the device (gadget) part of the connection. Optional.
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--dev-type Type of gadget to instantiate. Default: "eem"
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--bind-device Name of the device to bind, as listed in /sys/class/udc/
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--gadget-dir-name Optional base name for gadget directory. Default: iface-name
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--iface-name name of the network interface.
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--help Print this help and exit.
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HELP
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}
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gadget_start() {
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# Always provide a basic network configuration
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mkdir -p /run/systemd/network || return
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cat >/run/systemd/network/+-bmc-"${IFACE_NAME}".network <<EOF
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[Match]
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Name=${IFACE_NAME}
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EOF
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# Add the gbmcbr configuration if this is a relevant device
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if (( ID_VENDOR == 0x18d1 && ID_PRODUCT == 0x22b )); then
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cat >>/run/systemd/network/+-bmc-"${IFACE_NAME}".network <<EOF
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[Network]
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Bridge=gbmcbr
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[Bridge]
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Cost=85
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EOF
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fi
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# Ignore any failures due to systemd being unavailable at boot
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networkctl reload || true
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local gadget_dir="${CONFIGFS_HOME}/usb_gadget/${GADGET_DIR_NAME}"
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mkdir -p "${gadget_dir}" || return
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echo "${ID_VENDOR}" >"${gadget_dir}/idVendor" || return
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echo "${ID_PRODUCT}" >"${gadget_dir}/idProduct" || return
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local str_en_dir="${gadget_dir}/strings/0x409"
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mkdir -p "${str_en_dir}" || return
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echo "${STR_EN_VENDOR}" >"${str_en_dir}/manufacturer" || return
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echo "${STR_EN_PRODUCT}" >"${str_en_dir}/product" || return
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local config_dir="${gadget_dir}/configs/c.1"
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mkdir -p "${config_dir}" || return
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echo 100 > "${config_dir}/MaxPower" || return
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mkdir -p "${config_dir}/strings/0x409" || return
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echo "${DEV_TYPE^^}" > "${config_dir}/strings/0x409/configuration" || return
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local func_dir="${gadget_dir}/functions/${DEV_TYPE}.${IFACE_NAME}"
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mkdir -p "${func_dir}" || return
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if [[ -n $HOST_MAC_ADDR ]]; then
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echo "${HOST_MAC_ADDR}" >"${func_dir}"/host_addr || return
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fi
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if [[ -n $DEV_MAC_ADDR ]]; then
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echo "${DEV_MAC_ADDR}" >"${func_dir}"/dev_addr || return
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fi
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ln -s "${func_dir}" "${config_dir}" || return
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# This only works on kernel 5.12+, we have to ignore failures for now
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echo "$IFACE_NAME" >"${func_dir}"/ifname || true
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echo "${BIND_DEVICE}" >"${gadget_dir}"/UDC || return
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# Try to reconfigure a few times in case we race with systemd-networkd
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local start=$SECONDS
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while (( SECONDS - start < 5 )); do
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local ifname
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ifname="$(<"${func_dir}"/ifname)" || return
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[ "${IFACE_NAME}" = "$ifname" ] && break
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ip link set dev "$ifname" down && \
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ip link set dev "$ifname" name "${IFACE_NAME}" && break
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sleep 1
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done
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ip link set dev "$IFACE_NAME" up || return
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}
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gadget_stop() {
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local gadget_dir="${CONFIGFS_HOME}/usb_gadget/${GADGET_DIR_NAME}"
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rm -f "${gadget_dir}/configs/c.1/${DEV_TYPE}.${IFACE_NAME}"
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rmdir "${gadget_dir}/functions/${DEV_TYPE}.${IFACE_NAME}" \
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"${gadget_dir}/configs/c.1/strings/0x409" \
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"${gadget_dir}/configs/c.1" \
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"${gadget_dir}/strings/0x409" \
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"${gadget_dir}" || true
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rm -f /run/systemd/network/+-bmc-"${IFACE_NAME}".network
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networkctl reload || true
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}
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opts="$(getopt \
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--longoptions "$(printf "%s," "${ARGUMENT_LIST[@]}")" \
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--name "$(basename "$0")" \
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--options "" \
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-- "$@"
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)"
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eval set -- "$opts"
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CONFIGFS_HOME=${CONFIGFS_HOME:-/sys/kernel/config}
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ID_VENDOR="0x18d1" # Google
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ID_PRODUCT=""
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STR_EN_VENDOR="Google"
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STR_EN_PRODUCT=""
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DEV_MAC_ADDR=""
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DEV_TYPE="eem"
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HOST_MAC_ADDR=""
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BIND_DEVICE=""
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ACTION="start"
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GADGET_DIR_NAME=""
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IFACE_NAME=""
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while [[ $# -gt 0 ]]; do
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case "$1" in
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--product-id)
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ID_PRODUCT=$2
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shift 2
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;;
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--product-name)
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STR_EN_PRODUCT=$2
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shift 2
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;;
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--host-mac)
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HOST_MAC_ADDR=$2
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shift 2
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;;
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--dev-mac)
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DEV_MAC_ADDR=$2
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shift 2
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;;
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--dev-type)
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DEV_TYPE=$2
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shift 2
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;;
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--bind-device)
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BIND_DEVICE=$2
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shift 2
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;;
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--gadget-dir-name)
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GADGET_DIR_NAME=$2
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shift 2
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;;
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--iface-name)
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IFACE_NAME=$2
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shift 2
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;;
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--help)
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print_usage
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exit 0
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;;
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start)
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ACTION="start"
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shift 1
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break
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;;
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stop)
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ACTION="stop"
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shift 1
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break
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;;
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--)
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shift 1
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;;
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*)
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break
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;;
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esac
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done
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if [ -z "$GADGET_DIR_NAME" ]; then
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GADGET_DIR_NAME="$IFACE_NAME"
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fi
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if [[ $ACTION == "stop" ]]; then
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gadget_stop
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else
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if [ -z "$ID_PRODUCT" ]; then
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echo "Product ID is missing" >&2
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exit 1
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fi
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if [ -z "$IFACE_NAME" ]; then
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echo "Interface name is missing" >&2
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exit 1
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fi
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if [ -z "$BIND_DEVICE" ]; then
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echo "Bind device is missing" >&2
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exit 1
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fi
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rc=0
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gadget_start || rc=$?
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(( rc == 0 )) || gadget_stop || true
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exit $rc
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fi
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