2007-07-16 00:40:59 -06:00
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#ifndef _LINUX_USER_NAMESPACE_H
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#define _LINUX_USER_NAMESPACE_H
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#include <linux/kref.h>
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#include <linux/nsproxy.h>
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#include <linux/sched.h>
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2007-07-16 00:41:01 -06:00
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#include <linux/err.h>
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2007-07-16 00:40:59 -06:00
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2011-11-17 01:11:58 -07:00
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#define UID_GID_MAP_MAX_EXTENTS 5
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struct uid_gid_map { /* 64 bytes -- 1 cache line */
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u32 nr_extents;
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struct uid_gid_extent {
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u32 first;
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u32 lower_first;
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u32 count;
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} extent[UID_GID_MAP_MAX_EXTENTS];
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};
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2007-07-16 00:40:59 -06:00
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struct user_namespace {
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2011-11-17 01:11:58 -07:00
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struct uid_gid_map uid_map;
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struct uid_gid_map gid_map;
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2012-08-30 02:24:05 -06:00
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struct uid_gid_map projid_map;
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2007-07-16 00:40:59 -06:00
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struct kref kref;
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2011-11-16 22:59:43 -07:00
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struct user_namespace *parent;
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2011-11-17 02:32:59 -07:00
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kuid_t owner;
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kgid_t group;
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2007-07-16 00:40:59 -06:00
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};
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extern struct user_namespace init_user_ns;
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#ifdef CONFIG_USER_NS
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static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
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{
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if (ns)
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kref_get(&ns->kref);
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return ns;
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}
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2008-10-15 15:38:45 -06:00
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extern int create_user_ns(struct cred *new);
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2012-07-26 06:15:35 -06:00
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extern int unshare_userns(unsigned long unshare_flags, struct cred **new_cred);
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2007-07-16 00:40:59 -06:00
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extern void free_user_ns(struct kref *kref);
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static inline void put_user_ns(struct user_namespace *ns)
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{
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if (ns)
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kref_put(&ns->kref, free_user_ns);
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}
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2011-11-17 01:11:58 -07:00
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struct seq_operations;
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extern struct seq_operations proc_uid_seq_operations;
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extern struct seq_operations proc_gid_seq_operations;
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2012-08-30 02:24:05 -06:00
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extern struct seq_operations proc_projid_seq_operations;
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2011-11-17 01:11:58 -07:00
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extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
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extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
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2012-08-30 02:24:05 -06:00
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extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *);
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2007-07-16 00:40:59 -06:00
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#else
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static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
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{
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return &init_user_ns;
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}
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2008-10-15 15:38:45 -06:00
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static inline int create_user_ns(struct cred *new)
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2007-07-16 00:40:59 -06:00
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{
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2008-10-15 15:38:45 -06:00
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return -EINVAL;
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2007-07-16 00:40:59 -06:00
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}
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2012-07-26 06:15:35 -06:00
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static inline int unshare_userns(unsigned long unshare_flags,
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struct cred **new_cred)
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{
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if (unshare_flags & CLONE_NEWUSER)
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return -EINVAL;
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return 0;
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}
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2007-07-16 00:40:59 -06:00
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static inline void put_user_ns(struct user_namespace *ns)
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{
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}
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2011-11-17 01:11:58 -07:00
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#endif
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2007-07-16 00:40:59 -06:00
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#endif /* _LINUX_USER_H */
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