1 #ifndef _LINUX_PID_NS_H 2 #define _LINUX_PID_NS_H 3 4 #include <linux/sched.h> 5 #include <linux/bug.h> 6 #include <linux/mm.h> 7 #include <linux/workqueue.h> 8 #include <linux/threads.h> 9 #include <linux/nsproxy.h> 10 #include <linux/kref.h> 11 #include <linux/ns_common.h> 12 13 struct pidmap { 14 atomic_t nr_free; 15 void *page; 16 }; 17 18 #define BITS_PER_PAGE (PAGE_SIZE * 8) 19 #define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1) 20 #define PIDMAP_ENTRIES ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE) 21 22 struct fs_pin; 23 24 enum { /* definitions for pid_namespace's hide_pid field */ 25 HIDEPID_OFF = 0, 26 HIDEPID_NO_ACCESS = 1, 27 HIDEPID_INVISIBLE = 2, 28 }; 29 30 struct pid_namespace { 31 struct kref kref; 32 struct pidmap pidmap[PIDMAP_ENTRIES]; 33 struct rcu_head rcu; 34 int last_pid; 35 unsigned int nr_hashed; 36 struct task_struct *child_reaper; 37 struct kmem_cache *pid_cachep; 38 unsigned int level; 39 struct pid_namespace *parent; 40 #ifdef CONFIG_PROC_FS 41 struct vfsmount *proc_mnt; 42 struct dentry *proc_self; 43 struct dentry *proc_thread_self; 44 #endif 45 #ifdef CONFIG_BSD_PROCESS_ACCT 46 struct fs_pin *bacct; 47 #endif 48 struct user_namespace *user_ns; 49 struct ucounts *ucounts; 50 struct work_struct proc_work; 51 kgid_t pid_gid; 52 int hide_pid; 53 int reboot; /* group exit code if this pidns was rebooted */ 54 struct ns_common ns; 55 } __randomize_layout; 56 57 extern struct pid_namespace init_pid_ns; 58 59 #define PIDNS_HASH_ADDING (1U << 31) 60 61 #ifdef CONFIG_PID_NS 62 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 63 { 64 if (ns != &init_pid_ns) 65 kref_get(&ns->kref); 66 return ns; 67 } 68 69 extern struct pid_namespace *copy_pid_ns(unsigned long flags, 70 struct user_namespace *user_ns, struct pid_namespace *ns); 71 extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 72 extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 73 extern void put_pid_ns(struct pid_namespace *ns); 74 75 #else /* !CONFIG_PID_NS */ 76 #include <linux/err.h> 77 78 static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 79 { 80 return ns; 81 } 82 83 static inline struct pid_namespace *copy_pid_ns(unsigned long flags, 84 struct user_namespace *user_ns, struct pid_namespace *ns) 85 { 86 if (flags & CLONE_NEWPID) 87 ns = ERR_PTR(-EINVAL); 88 return ns; 89 } 90 91 static inline void put_pid_ns(struct pid_namespace *ns) 92 { 93 } 94 95 static inline void zap_pid_ns_processes(struct pid_namespace *ns) 96 { 97 BUG(); 98 } 99 100 static inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 101 { 102 return 0; 103 } 104 #endif /* CONFIG_PID_NS */ 105 106 extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 107 void pidhash_init(void); 108 void pidmap_init(void); 109 110 #endif /* _LINUX_PID_NS_H */ 111