github.com/MerlinKodo/gvisor@v0.0.0-20231110090155-957f62ecf90e/runsc/sandbox/network_unsafe.go (about)

     1  // Copyright 2019 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package sandbox
    16  
    17  import (
    18  	"unsafe"
    19  
    20  	"golang.org/x/sys/unix"
    21  )
    22  
    23  type ethtoolValue struct {
    24  	cmd uint32
    25  	val uint32
    26  }
    27  
    28  type ifreq struct {
    29  	ifrName [unix.IFNAMSIZ]byte
    30  	ifrData *ethtoolValue
    31  }
    32  
    33  const (
    34  	_ETHTOOL_GGSO = 0x00000023
    35  )
    36  
    37  func isGSOEnabled(fd int, intf string) (bool, error) {
    38  	val := ethtoolValue{
    39  		cmd: _ETHTOOL_GGSO,
    40  	}
    41  
    42  	var name [unix.IFNAMSIZ]byte
    43  	copy(name[:], []byte(intf))
    44  
    45  	ifr := ifreq{
    46  		ifrName: name,
    47  		ifrData: &val,
    48  	}
    49  
    50  	if _, _, err := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), unix.SIOCETHTOOL, uintptr(unsafe.Pointer(&ifr))); err != 0 {
    51  		return false, err
    52  	}
    53  
    54  	return val.val != 0, nil
    55  }