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// Copyright 2019 The gVisor Authors.
//
// 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.
package sandbox
import (
"unsafe"
"golang.org/x/sys/unix"
)
type ethtoolValue struct {
cmd uint32
val uint32
}
type ifreq struct {
ifrName [unix.IFNAMSIZ]byte
ifrData *ethtoolValue
}
const (
_ETHTOOL_GGSO = 0x00000023
)
func isGSOEnabled(fd int, intf string) (bool, error) {
val := ethtoolValue{
cmd: _ETHTOOL_GGSO,
}
var name [unix.IFNAMSIZ]byte
copy(name[:], []byte(intf))
ifr := ifreq{
ifrName: name,
ifrData: &val,
}
if _, _, err := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), unix.SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr))); err != 0 {
return false, err
}
return val.val != 0, nil
}
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