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