mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Andrei Vagin
04e7902bb5
The veth devices are virtual Ethernet devices. They can act as tunnels between network namespaces to create a bridge to a physical network device in another namespace, but can also be used as standalone network devices. More information can be found here: https://man7.org/linux/man-pages/man4/veth.4.html PiperOrigin-RevId: 638853289
80 lines
2.3 KiB
Go
80 lines
2.3 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package kernel
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import (
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"gvisor.dev/gvisor/pkg/errors/linuxerr"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs"
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"gvisor.dev/gvisor/pkg/sentry/fsimpl/nsfs"
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"gvisor.dev/gvisor/pkg/sentry/inet"
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)
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// IsNetworkNamespaced returns true if t is in a non-root network namespace.
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func (t *Task) IsNetworkNamespaced() bool {
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return !t.netns.IsRoot()
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}
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// NetworkContext returns the network stack used by the task. NetworkContext
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// may return nil if no network stack is available.
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//
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// TODO(gvisor.dev/issue/1833): Migrate callers of this method to
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// NetworkNamespace().
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func (t *Task) NetworkContext() inet.Stack {
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return t.netns.Stack()
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}
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// NetworkNamespace returns the network namespace observed by the task.
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func (t *Task) NetworkNamespace() *inet.Namespace {
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return t.netns
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}
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// GetNetworkNamespace takes a reference on the task network namespace and
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// returns it. It can return nil if the task isn't alive.
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func (t *Task) GetNetworkNamespace() *inet.Namespace {
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// t.mu is required to be sure that the network namespace will not be
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// released.
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t.mu.Lock()
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netns := t.netns
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if netns != nil {
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netns.IncRef()
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}
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t.mu.Unlock()
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return netns
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}
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// NetworkNamespaceByFD returns the network namespace associated with the specified descriptor.
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func (t *Task) NetworkNamespaceByFD(fd int32) (*inet.Namespace, error) {
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file := t.GetFile(fd)
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if file == nil {
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return nil, linuxerr.EBADF
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}
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defer file.DecRef(t)
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d, ok := file.Dentry().Impl().(*kernfs.Dentry)
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if !ok {
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return nil, linuxerr.EINVAL
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}
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i, ok := d.Inode().(*nsfs.Inode)
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if !ok {
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return nil, linuxerr.EINVAL
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}
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ns, ok := i.Namespace().(*inet.Namespace)
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if !ok {
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return nil, linuxerr.EINVAL
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}
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ns.IncRef()
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return ns, nil
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}
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