gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/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  	"gvisor.dev/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  	return !t.netns.IsRoot()
    24  }
    25  
    26  // NetworkContext returns the network stack used by the task. NetworkContext
    27  // may return nil if no network stack is available.
    28  //
    29  // TODO(gvisor.dev/issue/1833): Migrate callers of this method to
    30  // NetworkNamespace().
    31  func (t *Task) NetworkContext() inet.Stack {
    32  	return t.netns.Stack()
    33  }
    34  
    35  // NetworkNamespace returns the network namespace observed by the task.
    36  func (t *Task) NetworkNamespace() *inet.Namespace {
    37  	return t.netns
    38  }
    39  
    40  // GetNetworkNamespace takes a reference on the task network namespace and
    41  // returns it. It can return nil if the task isn't alive.
    42  func (t *Task) GetNetworkNamespace() *inet.Namespace {
    43  	// t.mu is required to be sure that the network namespace will not be
    44  	// released.
    45  	t.mu.Lock()
    46  	netns := t.netns
    47  	if netns != nil {
    48  		netns.IncRef()
    49  	}
    50  	t.mu.Unlock()
    51  	return netns
    52  }