LXR linux/include/linux/pid

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_PID_NS_H
   3#define _LINUX_PID_NS_H
   4
   5#include <linux/sched.h>
   6#include <linux/bug.h>
   7#include <linux/mm.h>
   8#include <linux/workqueue.h>
   9#include <linux/threads.h>
  10#include <linux/nsproxy.h>
  11#include <linux/kref.h>
  12#include <linux/ns_common.h>
  13#include <linux/idr.h>
  14
  15
  16struct fs_pin;
  17
  18enum { /* definitions for pid_namespace's hide_pid field */
  19        HIDEPID_OFF       = 0,
  20        HIDEPID_NO_ACCESS = 1,
  21        HIDEPID_INVISIBLE = 2,
  22};
  23
  24struct pid_namespace {
  25        struct kref kref;
  26        struct idr idr;
  27        struct rcu_head rcu;
  28        unsigned int pid_allocated;
  29        struct task_struct *child_reaper;
  30        struct kmem_cache *pid_cachep;
  31        unsigned int level;
  32        struct pid_namespace *parent;
  33#ifdef CONFIG_PROC_FS
  34        struct vfsmount *proc_mnt;
  35        struct dentry *proc_self;
  36        struct dentry *proc_thread_self;
  37#endif
  38#ifdef CONFIG_BSD_PROCESS_ACCT
  39        struct fs_pin *bacct;
  40#endif
  41        struct user_namespace *user_ns;
  42        struct ucounts *ucounts;
  43        struct work_struct proc_work;
  44        kgid_t pid_gid;
  45        int hide_pid;
  46        int reboot;     /* group exit code if this pidns was rebooted */
  47        struct ns_common ns;
  48} __randomize_layout;
  49
  50extern struct pid_namespace init_pid_ns;
  51
  52#define PIDNS_ADDING (1U << 31)
  53
  54#ifdef CONFIG_PID_NS
  55static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  56{
  57        if (ns != &init_pid_ns)
  58                kref_get(&ns->kref);
  59        return ns;
  60}
  61
  62extern struct pid_namespace *copy_pid_ns(unsigned long flags,
  63        struct user_namespace *user_ns, struct pid_namespace *ns);
  64extern void zap_pid_ns_processes(struct pid_namespace *pid_ns);
  65extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd);
  66extern void put_pid_ns(struct pid_namespace *ns);
  67
  68#else /* !CONFIG_PID_NS */
  69#include <linux/err.h>
  70
  71static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns)
  72{
  73        return ns;
  74}
  75
  76static inline struct pid_namespace *copy_pid_ns(unsigned long flags,
  77        struct user_namespace *user_ns, struct pid_namespace *ns)
  78{
  79        if (flags & CLONE_NEWPID)
  80                ns = ERR_PTR(-EINVAL);
  81        return ns;
  82}
  83
  84static inline void put_pid_ns(struct pid_namespace *ns)
  85{
  86}
  87
  88static inline void zap_pid_ns_processes(struct pid_namespace *ns)
  89{
  90        BUG();
  91}
  92
  93static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd)
  94{
  95        return 0;
  96}
  97#endif /* CONFIG_PID_NS */
  98
  99extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
 100void pidhash_init(void);
 101void pid_idr_init(void);
 102
 103#endif /* _LINUX_PID_NS_H */
 104