1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kernel
import (
"gvisor.dev/gvisor/pkg/errors/linuxerr"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
"gvisor.dev/gvisor/pkg/sentry/fsimpl/nsfs"
"gvisor.dev/gvisor/pkg/sentry/inet"
)
// IsNetworkNamespaced returns true if t is in a non-root network namespace.
func (t *Task) IsNetworkNamespaced() bool {
return !t.netns.IsRoot()
}
// NetworkContext returns the network stack used by the task. NetworkContext
// may return nil if no network stack is available.
//
// TODO(gvisor.dev/issue/1833): Migrate callers of this method to
// NetworkNamespace().
func (t *Task) NetworkContext() inet.Stack {
return t.netns.Stack()
}
// NetworkNamespace returns the network namespace observed by the task.
func (t *Task) NetworkNamespace() *inet.Namespace {
return t.netns
}
// GetNetworkNamespace takes a reference on the task network namespace and
// returns it. It can return nil if the task isn't alive.
func (t *Task) GetNetworkNamespace() *inet.Namespace {
// t.mu is required to be sure that the network namespace will not be
// released.
t.mu.Lock()
netns := t.netns
if netns != nil {
netns.IncRef()
}
t.mu.Unlock()
return netns
}
// NetworkNamespaceByFD returns the network namespace associated with the specified descriptor.
func (t *Task) NetworkNamespaceByFD(fd int32) (*inet.Namespace, error) {
file := t.GetFile(fd)
if file == nil {
return nil, linuxerr.EBADF
}
defer file.DecRef(t)
d, ok := file.Dentry().Impl().(*kernfs.Dentry)
if !ok {
return nil, linuxerr.EINVAL
}
i, ok := d.Inode().(*nsfs.Inode)
if !ok {
return nil, linuxerr.EINVAL
}
ns, ok := i.Namespace().(*inet.Namespace)
if !ok {
return nil, linuxerr.EINVAL
}
ns.IncRef()
return ns, nil
}
|
