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Copyright © 2022 Merbridge 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 ns On Linux each OS thread can have a different network namespace. Go's thread scheduling model switches goroutines between OS threads based on OS thread load and whether the goroutine would block other goroutines. This can result in a goroutine switching network namespaces without notice and lead to errors in your code.
Index ¶
Constants ¶
const (
// SoMark mark packets sent from a specific socket.
SoMark = 0x24
)
Variables ¶
This section is empty.
Functions ¶
Types ¶
type NetNS ¶
type NetNS interface {
// Do execute the passed closure in this object's network namespace,
// attempting to restore the original namespace before returning.
// However, since each OS thread can have a different network namespace,
// and Go's thread scheduling is highly variable, callers cannot
// guarantee any specific namespace is set unless operations that
// require that namespace are wrapped with Do(). Also, no code called
// from Do() should call runtime.UnlockOSThread(), or the risk
// of executing code in an incorrect namespace will be greater. See
// https://github.com/golang/go/wiki/LockOSThread for further details.
Do(toRun func(NetNS) error) error
// Set the current network namespace to this object's network namespace.
// Note that since Go's thread scheduling is highly variable, callers
// cannot guarantee the requested namespace will be the current namespace
// after this function is called; to ensure this wrap operations that
// require the namespace with Do() instead.
Set() error
// Path returns the filesystem path representing this object's network namespace
Path() string
// Fd returns a file descriptor representing this object's network namespace
Fd() uintptr
// Close cleans up this instance of the network namespace; if this instance
// is the last user the namespace will be destroyed
Close() error
}
NetNS define netns ops
func GetCurrentNS ¶
GetCurrentNS returns an object representing the current OS thread's network namespace
Source Files