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

     1  // Copyright 2018 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 kernel
    16  
    17  import (
    18  	"github.com/SagerNet/gvisor/pkg/sentry/inet"
    19  )
    20  
    21  // IsNetworkNamespaced returns true if t is in a non-root network namespace.
    22  func (t *Task) IsNetworkNamespaced() bool {
    23  	t.mu.Lock()
    24  	defer t.mu.Unlock()
    25  	return !t.netns.IsRoot()
    26  }
    27  
    28  // NetworkContext returns the network stack used by the task. NetworkContext
    29  // may return nil if no network stack is available.
    30  //
    31  // TODO(github.com/SagerNet/issue/1833): Migrate callers of this method to
    32  // NetworkNamespace().
    33  func (t *Task) NetworkContext() inet.Stack {
    34  	t.mu.Lock()
    35  	defer t.mu.Unlock()
    36  	return t.netns.Stack()
    37  }
    38  
    39  // NetworkNamespace returns the network namespace observed by the task.
    40  func (t *Task) NetworkNamespace() *inet.Namespace {
    41  	t.mu.Lock()
    42  	defer t.mu.Unlock()
    43  	return t.netns
    44  }