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#ifndef _LINUX_USER_NAMESPACE_H
#define _LINUX_USER_NAMESPACE_H
#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/sched.h>
#include <linux/err.h>
#define UID_GID_MAP_MAX_EXTENTS 5
struct uid_gid_map { /* 64 bytes -- 1 cache line */
u32 nr_extents;
struct uid_gid_extent {
u32 first;
u32 lower_first;
u32 count;
} extent[UID_GID_MAP_MAX_EXTENTS];
};
struct user_namespace {
struct uid_gid_map uid_map;
struct uid_gid_map gid_map;
struct kref kref;
struct user_namespace *parent;
kuid_t owner;
kgid_t group;
};
extern struct user_namespace init_user_ns;
#ifdef CONFIG_USER_NS
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
if (ns)
kref_get(&ns->kref);
return ns;
}
extern int create_user_ns(struct cred *new);
extern void free_user_ns(struct kref *kref);
static inline void put_user_ns(struct user_namespace *ns)
{
if (ns)
kref_put(&ns->kref, free_user_ns);
}
struct seq_operations;
extern struct seq_operations proc_uid_seq_operations;
extern struct seq_operations proc_gid_seq_operations;
extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *);
extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *);
#else
static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
return &init_user_ns;
}
static inline int create_user_ns(struct cred *new)
{
return -EINVAL;
}
static inline void put_user_ns(struct user_namespace *ns)
{
}
#endif
static inline uid_t user_ns_map_uid(struct user_namespace *to,
const struct cred *cred, kuid_t uid)
{
return from_kuid_munged(to, uid);
}
static inline gid_t user_ns_map_gid(struct user_namespace *to,
const struct cred *cred, kgid_t gid)
{
return from_kgid_munged(to, gid);
}
#endif /* _LINUX_USER_H */
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