1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef _LINUX_PID_NS_H 3*4882a593Smuzhiyun #define _LINUX_PID_NS_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/sched.h> 6*4882a593Smuzhiyun #include <linux/bug.h> 7*4882a593Smuzhiyun #include <linux/mm.h> 8*4882a593Smuzhiyun #include <linux/workqueue.h> 9*4882a593Smuzhiyun #include <linux/threads.h> 10*4882a593Smuzhiyun #include <linux/nsproxy.h> 11*4882a593Smuzhiyun #include <linux/kref.h> 12*4882a593Smuzhiyun #include <linux/ns_common.h> 13*4882a593Smuzhiyun #include <linux/idr.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun /* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */ 16*4882a593Smuzhiyun #define MAX_PID_NS_LEVEL 32 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun struct fs_pin; 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun struct pid_namespace { 21*4882a593Smuzhiyun struct kref kref; 22*4882a593Smuzhiyun struct idr idr; 23*4882a593Smuzhiyun struct rcu_head rcu; 24*4882a593Smuzhiyun unsigned int pid_allocated; 25*4882a593Smuzhiyun struct task_struct *child_reaper; 26*4882a593Smuzhiyun struct kmem_cache *pid_cachep; 27*4882a593Smuzhiyun unsigned int level; 28*4882a593Smuzhiyun struct pid_namespace *parent; 29*4882a593Smuzhiyun #ifdef CONFIG_BSD_PROCESS_ACCT 30*4882a593Smuzhiyun struct fs_pin *bacct; 31*4882a593Smuzhiyun #endif 32*4882a593Smuzhiyun struct user_namespace *user_ns; 33*4882a593Smuzhiyun struct ucounts *ucounts; 34*4882a593Smuzhiyun int reboot; /* group exit code if this pidns was rebooted */ 35*4882a593Smuzhiyun struct ns_common ns; 36*4882a593Smuzhiyun } __randomize_layout; 37*4882a593Smuzhiyun 38*4882a593Smuzhiyun extern struct pid_namespace init_pid_ns; 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun #define PIDNS_ADDING (1U << 31) 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #ifdef CONFIG_PID_NS get_pid_ns(struct pid_namespace * ns)43*4882a593Smuzhiyunstatic inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 44*4882a593Smuzhiyun { 45*4882a593Smuzhiyun if (ns != &init_pid_ns) 46*4882a593Smuzhiyun kref_get(&ns->kref); 47*4882a593Smuzhiyun return ns; 48*4882a593Smuzhiyun } 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun extern struct pid_namespace *copy_pid_ns(unsigned long flags, 51*4882a593Smuzhiyun struct user_namespace *user_ns, struct pid_namespace *ns); 52*4882a593Smuzhiyun extern void zap_pid_ns_processes(struct pid_namespace *pid_ns); 53*4882a593Smuzhiyun extern int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd); 54*4882a593Smuzhiyun extern void put_pid_ns(struct pid_namespace *ns); 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun #else /* !CONFIG_PID_NS */ 57*4882a593Smuzhiyun #include <linux/err.h> 58*4882a593Smuzhiyun get_pid_ns(struct pid_namespace * ns)59*4882a593Smuzhiyunstatic inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) 60*4882a593Smuzhiyun { 61*4882a593Smuzhiyun return ns; 62*4882a593Smuzhiyun } 63*4882a593Smuzhiyun copy_pid_ns(unsigned long flags,struct user_namespace * user_ns,struct pid_namespace * ns)64*4882a593Smuzhiyunstatic inline struct pid_namespace *copy_pid_ns(unsigned long flags, 65*4882a593Smuzhiyun struct user_namespace *user_ns, struct pid_namespace *ns) 66*4882a593Smuzhiyun { 67*4882a593Smuzhiyun if (flags & CLONE_NEWPID) 68*4882a593Smuzhiyun ns = ERR_PTR(-EINVAL); 69*4882a593Smuzhiyun return ns; 70*4882a593Smuzhiyun } 71*4882a593Smuzhiyun put_pid_ns(struct pid_namespace * ns)72*4882a593Smuzhiyunstatic inline void put_pid_ns(struct pid_namespace *ns) 73*4882a593Smuzhiyun { 74*4882a593Smuzhiyun } 75*4882a593Smuzhiyun zap_pid_ns_processes(struct pid_namespace * ns)76*4882a593Smuzhiyunstatic inline void zap_pid_ns_processes(struct pid_namespace *ns) 77*4882a593Smuzhiyun { 78*4882a593Smuzhiyun BUG(); 79*4882a593Smuzhiyun } 80*4882a593Smuzhiyun reboot_pid_ns(struct pid_namespace * pid_ns,int cmd)81*4882a593Smuzhiyunstatic inline int reboot_pid_ns(struct pid_namespace *pid_ns, int cmd) 82*4882a593Smuzhiyun { 83*4882a593Smuzhiyun return 0; 84*4882a593Smuzhiyun } 85*4882a593Smuzhiyun #endif /* CONFIG_PID_NS */ 86*4882a593Smuzhiyun 87*4882a593Smuzhiyun extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk); 88*4882a593Smuzhiyun void pidhash_init(void); 89*4882a593Smuzhiyun void pid_idr_init(void); 90*4882a593Smuzhiyun 91*4882a593Smuzhiyun #endif /* _LINUX_PID_NS_H */ 92