2019-04-29 21:25:05 +00:00
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// Copyright 2019 The gVisor Authors.
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2019-03-29 23:26:36 +00:00
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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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package sandbox
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import (
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"syscall"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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type ethtoolValue struct {
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cmd uint32
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val uint32
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}
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type ifreq struct {
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ifrName [unix.IFNAMSIZ]byte
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ifrData *ethtoolValue
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}
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const (
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_ETHTOOL_GGSO = 0x00000023
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)
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func isGSOEnabled(fd int, intf string) (bool, error) {
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val := ethtoolValue{
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cmd: _ETHTOOL_GGSO,
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}
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var name [unix.IFNAMSIZ]byte
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copy(name[:], []byte(intf))
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ifr := ifreq{
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ifrName: name,
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ifrData: &val,
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}
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if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(fd), unix.SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr))); err != 0 {
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return false, err
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}
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return val.val != 0, nil
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}
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