/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_NS_COMMON_H #define _LINUX_NS_COMMON_H #include #include #include struct proc_ns_operations; struct cgroup_namespace; struct ipc_namespace; struct mnt_namespace; struct net; struct pid_namespace; struct time_namespace; struct user_namespace; struct uts_namespace; extern struct cgroup_namespace init_cgroup_ns; extern struct ipc_namespace init_ipc_ns; extern struct mnt_namespace init_mnt_ns; extern struct net init_net; extern struct pid_namespace init_pid_ns; extern struct time_namespace init_time_ns; extern struct user_namespace init_user_ns; extern struct uts_namespace init_uts_ns; extern const struct proc_ns_operations netns_operations; extern const struct proc_ns_operations utsns_operations; extern const struct proc_ns_operations ipcns_operations; extern const struct proc_ns_operations pidns_operations; extern const struct proc_ns_operations pidns_for_children_operations; extern const struct proc_ns_operations userns_operations; extern const struct proc_ns_operations mntns_operations; extern const struct proc_ns_operations cgroupns_operations; extern const struct proc_ns_operations timens_operations; extern const struct proc_ns_operations timens_for_children_operations; struct ns_common { u32 ns_type; struct dentry *stashed; const struct proc_ns_operations *ops; unsigned int inum; refcount_t __ns_ref; /* do not use directly */ union { struct { u64 ns_id; struct rb_node ns_tree_node; struct list_head ns_list_node; }; struct rcu_head ns_rcu; }; }; int __ns_common_init(struct ns_common *ns, u32 ns_type, const struct proc_ns_operations *ops, int inum); void __ns_common_free(struct ns_common *ns); #define to_ns_common(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: &(__ns)->ns, \ const struct cgroup_namespace *: &(__ns)->ns, \ struct ipc_namespace *: &(__ns)->ns, \ const struct ipc_namespace *: &(__ns)->ns, \ struct mnt_namespace *: &(__ns)->ns, \ const struct mnt_namespace *: &(__ns)->ns, \ struct net *: &(__ns)->ns, \ const struct net *: &(__ns)->ns, \ struct pid_namespace *: &(__ns)->ns, \ const struct pid_namespace *: &(__ns)->ns, \ struct time_namespace *: &(__ns)->ns, \ const struct time_namespace *: &(__ns)->ns, \ struct user_namespace *: &(__ns)->ns, \ const struct user_namespace *: &(__ns)->ns, \ struct uts_namespace *: &(__ns)->ns, \ const struct uts_namespace *: &(__ns)->ns) #define ns_init_inum(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: CGROUP_NS_INIT_INO, \ struct ipc_namespace *: IPC_NS_INIT_INO, \ struct mnt_namespace *: MNT_NS_INIT_INO, \ struct net *: NET_NS_INIT_INO, \ struct pid_namespace *: PID_NS_INIT_INO, \ struct time_namespace *: TIME_NS_INIT_INO, \ struct user_namespace *: USER_NS_INIT_INO, \ struct uts_namespace *: UTS_NS_INIT_INO) #define ns_init_ns(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: &init_cgroup_ns, \ struct ipc_namespace *: &init_ipc_ns, \ struct mnt_namespace *: &init_mnt_ns, \ struct net *: &init_net, \ struct pid_namespace *: &init_pid_ns, \ struct time_namespace *: &init_time_ns, \ struct user_namespace *: &init_user_ns, \ struct uts_namespace *: &init_uts_ns) #define to_ns_operations(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: (IS_ENABLED(CONFIG_CGROUPS) ? &cgroupns_operations : NULL), \ struct ipc_namespace *: (IS_ENABLED(CONFIG_IPC_NS) ? &ipcns_operations : NULL), \ struct mnt_namespace *: &mntns_operations, \ struct net *: (IS_ENABLED(CONFIG_NET_NS) ? &netns_operations : NULL), \ struct pid_namespace *: (IS_ENABLED(CONFIG_PID_NS) ? &pidns_operations : NULL), \ struct time_namespace *: (IS_ENABLED(CONFIG_TIME_NS) ? &timens_operations : NULL), \ struct user_namespace *: (IS_ENABLED(CONFIG_USER_NS) ? &userns_operations : NULL), \ struct uts_namespace *: (IS_ENABLED(CONFIG_UTS_NS) ? &utsns_operations : NULL)) #define ns_common_type(__ns) \ _Generic((__ns), \ struct cgroup_namespace *: CLONE_NEWCGROUP, \ struct ipc_namespace *: CLONE_NEWIPC, \ struct mnt_namespace *: CLONE_NEWNS, \ struct net *: CLONE_NEWNET, \ struct pid_namespace *: CLONE_NEWPID, \ struct time_namespace *: CLONE_NEWTIME, \ struct user_namespace *: CLONE_NEWUSER, \ struct uts_namespace *: CLONE_NEWUTS) #define ns_common_init(__ns) \ __ns_common_init(to_ns_common(__ns), \ ns_common_type(__ns), \ to_ns_operations(__ns), \ (((__ns) == ns_init_ns(__ns)) ? ns_init_inum(__ns) : 0)) #define ns_common_init_inum(__ns, __inum) \ __ns_common_init(to_ns_common(__ns), \ ns_common_type(__ns), \ to_ns_operations(__ns), \ __inum) #define ns_common_free(__ns) __ns_common_free(to_ns_common((__ns))) static __always_inline __must_check bool __ns_ref_put(struct ns_common *ns) { return refcount_dec_and_test(&ns->__ns_ref); } static __always_inline __must_check bool __ns_ref_get(struct ns_common *ns) { return refcount_inc_not_zero(&ns->__ns_ref); } #define ns_ref_read(__ns) refcount_read(&to_ns_common((__ns))->__ns_ref) #define ns_ref_inc(__ns) refcount_inc(&to_ns_common((__ns))->__ns_ref) #define ns_ref_get(__ns) __ns_ref_get(to_ns_common((__ns))) #define ns_ref_put(__ns) __ns_ref_put(to_ns_common((__ns))) #define ns_ref_put_and_lock(__ns, __lock) \ refcount_dec_and_lock(&to_ns_common((__ns))->__ns_ref, (__lock)) #endif