mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-27 07:20:24 +00:00
105 lines
3.6 KiB
Go
105 lines
3.6 KiB
Go
/*
|
|
Copyright 2023 The Kubernetes 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 sysctl
|
|
|
|
import (
|
|
"strings"
|
|
)
|
|
|
|
// Namespace represents a kernel namespace name.
|
|
type Namespace string
|
|
|
|
const (
|
|
// refer to https://man7.org/linux/man-pages/man7/ipc_namespaces.7.html
|
|
// the Linux IPC namespace
|
|
IPCNamespace = Namespace("IPC")
|
|
|
|
// refer to https://man7.org/linux/man-pages/man7/network_namespaces.7.html
|
|
// the network namespace
|
|
NetNamespace = Namespace("Net")
|
|
|
|
// the zero value if no namespace is known
|
|
UnknownNamespace = Namespace("")
|
|
)
|
|
|
|
var nameToNamespace = map[string]Namespace{
|
|
// kernel semaphore parameters: SEMMSL, SEMMNS, SEMOPM, and SEMMNI.
|
|
"kernel.sem": IPCNamespace,
|
|
// kernel shared memory limits include shmall, shmmax, shmmni, and shm_rmid_forced.
|
|
"kernel.shmall": IPCNamespace,
|
|
"kernel.shmmax": IPCNamespace,
|
|
"kernel.shmmni": IPCNamespace,
|
|
"kernel.shm_rmid_forced": IPCNamespace,
|
|
// make backward compatibility to know the namespace of kernel.shm*
|
|
"kernel.shm": IPCNamespace,
|
|
// kernel messages include msgmni, msgmax and msgmnb.
|
|
"kernel.msgmax": IPCNamespace,
|
|
"kernel.msgmnb": IPCNamespace,
|
|
"kernel.msgmni": IPCNamespace,
|
|
// make backward compatibility to know the namespace of kernel.msg*
|
|
"kernel.msg": IPCNamespace,
|
|
}
|
|
|
|
var prefixToNamespace = map[string]Namespace{
|
|
"net": NetNamespace,
|
|
// mqueue filesystem provides the necessary kernel features to enable the creation
|
|
// of a user space library that implements the POSIX message queues API.
|
|
"fs.mqueue": IPCNamespace,
|
|
}
|
|
|
|
// namespaceOf returns the namespace of the Linux kernel for a sysctl, or
|
|
// unknownNamespace if the sysctl is not known to be namespaced.
|
|
// The second return is prefixed bool.
|
|
// It returns true if the key is prefixed with a key in the prefix map
|
|
func namespaceOf(val string) Namespace {
|
|
if ns, found := nameToNamespace[val]; found {
|
|
return ns
|
|
}
|
|
for p, ns := range prefixToNamespace {
|
|
if strings.HasPrefix(val, p+".") {
|
|
return ns
|
|
}
|
|
}
|
|
return UnknownNamespace
|
|
}
|
|
|
|
// GetNamespace extracts information from a sysctl string. It returns:
|
|
// 1. The sysctl namespace, which can be one of the following: IPC, Net, or unknown.
|
|
// 2. sysctlOrPrefix: the prefix of the sysctl parameter until the first '*'.
|
|
// If there is no '*', it will be the original string.
|
|
// 3. 'prefixed' is set to true if the sysctl parameter contains '*' or it is in the prefixToNamespace key list, in most cases, it is a suffix *.
|
|
//
|
|
// For example, if the input sysctl is 'net.ipv6.neigh.*', GetNamespace will return:
|
|
// - The Net namespace
|
|
// - The sysctlOrPrefix as 'net.ipv6.neigh'
|
|
// - 'prefixed' set to true
|
|
//
|
|
// For the input sysctl 'net.ipv6.conf.all.disable_ipv6', GetNamespace will return:
|
|
// - The Net namespace
|
|
// - The sysctlOrPrefix as 'net.ipv6.conf.all.disable_ipv6'
|
|
// - 'prefixed' set to false.
|
|
func GetNamespace(sysctl string) (ns Namespace, sysctlOrPrefix string, prefixed bool) {
|
|
sysctlOrPrefix = NormalizeName(sysctl)
|
|
firstIndex := strings.IndexAny(sysctlOrPrefix, "*")
|
|
if firstIndex != -1 {
|
|
sysctlOrPrefix = sysctlOrPrefix[:firstIndex]
|
|
prefixed = true
|
|
}
|
|
ns = namespaceOf(sysctlOrPrefix)
|
|
return
|
|
}
|