github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/sentry/devices/quotedev/quotedev.go (about)

     1  // Copyright 2021 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 quotedev implements a vfs.Device for /dev/gvisor_quote.
    16  package quotedev
    17  
    18  import (
    19  	"github.com/SagerNet/gvisor/pkg/abi/linux"
    20  	"github.com/SagerNet/gvisor/pkg/context"
    21  	"github.com/SagerNet/gvisor/pkg/sentry/fsimpl/devtmpfs"
    22  	"github.com/SagerNet/gvisor/pkg/sentry/vfs"
    23  	"github.com/SagerNet/gvisor/pkg/syserror"
    24  )
    25  
    26  const (
    27  	quoteDevMinor = 0
    28  )
    29  
    30  // quoteDevice implements vfs.Device for /dev/gvisor_quote
    31  //
    32  // +stateify savable
    33  type quoteDevice struct{}
    34  
    35  // Open implements vfs.Device.Open.
    36  // TODO(b/157161182): Add support for attestation ioctls.
    37  func (quoteDevice) Open(ctx context.Context, mnt *vfs.Mount, vfsd *vfs.Dentry, opts vfs.OpenOptions) (*vfs.FileDescription, error) {
    38  	return nil, syserror.EIO
    39  }
    40  
    41  // Register registers all devices implemented by this package in vfsObj.
    42  func Register(vfsObj *vfs.VirtualFilesystem) error {
    43  	return vfsObj.RegisterDevice(vfs.CharDevice, linux.UNNAMED_MAJOR, quoteDevMinor, quoteDevice{}, &vfs.RegisterDeviceOptions{
    44  		GroupName: "gvisor_quote",
    45  	})
    46  }
    47  
    48  // CreateDevtmpfsFiles creates device special files in dev representing all
    49  // devices implemented by this package.
    50  func CreateDevtmpfsFiles(ctx context.Context, dev *devtmpfs.Accessor) error {
    51  	return dev.CreateDeviceFile(ctx, "gvisor_quote", vfs.CharDevice, linux.UNNAMED_MAJOR, quoteDevMinor, 0666 /* mode */)
    52  }