security/tomoyo/common.h

/*
 * security/tomoyo/common.h
 *
 * Header file for TOMOYO.
 *
 * Copyright (C) 2005-2010  NTT DATA CORPORATION
 */

#ifndef _SECURITY_TOMOYO_COMMON_H
#define _SECURITY_TOMOYO_COMMON_H

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/kmod.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/list.h>
#include <linux/cred.h>
#include <linux/poll.h>
struct linux_binprm;

/********** Constants definitions. **********/

/*
 * TOMOYO uses this hash only when appending a string into the string
 * table. Frequency of appending strings is very low. So we don't need
 * large (e.g. 64k) hash size. 256 will be sufficient.
 */
#define TOMOYO_HASH_BITS  8
#define TOMOYO_MAX_HASH (1u<<TOMOYO_HASH_BITS)

#define TOMOYO_EXEC_TMPSIZE     4096

/* Profile number is an integer between 0 and 255. */
#define TOMOYO_MAX_PROFILES 256

/* Group number is an integer between 0 and 255. */
#define TOMOYO_MAX_ACL_GROUPS 256

/* Index numbers for operation mode. */
enum tomoyo_mode_index {
	TOMOYO_CONFIG_DISABLED,
	TOMOYO_CONFIG_LEARNING,
	TOMOYO_CONFIG_PERMISSIVE,
	TOMOYO_CONFIG_ENFORCING,
	TOMOYO_CONFIG_MAX_MODE,
	TOMOYO_CONFIG_WANT_REJECT_LOG =  64,
	TOMOYO_CONFIG_WANT_GRANT_LOG  = 128,
	TOMOYO_CONFIG_USE_DEFAULT     = 255,
};

/* Index numbers for entry type. */
enum tomoyo_policy_id {
	TOMOYO_ID_GROUP,
	TOMOYO_ID_PATH_GROUP,
	TOMOYO_ID_NUMBER_GROUP,
	TOMOYO_ID_TRANSITION_CONTROL,
	TOMOYO_ID_AGGREGATOR,
	TOMOYO_ID_MANAGER,
	TOMOYO_ID_NAME,
	TOMOYO_ID_ACL,
	TOMOYO_ID_DOMAIN,
	TOMOYO_MAX_POLICY
};

/* Index numbers for domain's attributes. */
enum tomoyo_domain_info_flags_index {
	/* Quota warnning flag.   */
	TOMOYO_DIF_QUOTA_WARNED,
	/*
	 * This domain was unable to create a new domain at
	 * tomoyo_find_next_domain() because the name of the domain to be
	 * created was too long or it could not allocate memory.
	 * More than one process continued execve() without domain transition.
	 */
	TOMOYO_DIF_TRANSITION_FAILED,
	TOMOYO_MAX_DOMAIN_INFO_FLAGS
};

/* Index numbers for group entries. */
enum tomoyo_group_id {
	TOMOYO_PATH_GROUP,
	TOMOYO_NUMBER_GROUP,
	TOMOYO_MAX_GROUP
};

/* Index numbers for type of numeric values. */
enum tomoyo_value_type {
	TOMOYO_VALUE_TYPE_INVALID,
	TOMOYO_VALUE_TYPE_DECIMAL,
	TOMOYO_VALUE_TYPE_OCTAL,
	TOMOYO_VALUE_TYPE_HEXADECIMAL,
};

/* Index numbers for domain transition control keywords. */
enum tomoyo_transition_type {
	/* Do not change this order, */
	TOMOYO_TRANSITION_CONTROL_NO_RESET,
	TOMOYO_TRANSITION_CONTROL_RESET,
	TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE,
	TOMOYO_TRANSITION_CONTROL_INITIALIZE,
	TOMOYO_TRANSITION_CONTROL_NO_KEEP,
	TOMOYO_TRANSITION_CONTROL_KEEP,
	TOMOYO_MAX_TRANSITION_TYPE
};

/* Index numbers for Access Controls. */
enum tomoyo_acl_entry_type_index {
	TOMOYO_TYPE_PATH_ACL,
	TOMOYO_TYPE_PATH2_ACL,
	TOMOYO_TYPE_PATH_NUMBER_ACL,
	TOMOYO_TYPE_MKDEV_ACL,
	TOMOYO_TYPE_MOUNT_ACL,
};

/* Index numbers for access controls with one pathname. */
enum tomoyo_path_acl_index {
	TOMOYO_TYPE_EXECUTE,
	TOMOYO_TYPE_READ,
	TOMOYO_TYPE_WRITE,
	TOMOYO_TYPE_APPEND,
	TOMOYO_TYPE_UNLINK,
	TOMOYO_TYPE_GETATTR,
	TOMOYO_TYPE_RMDIR,
	TOMOYO_TYPE_TRUNCATE,
	TOMOYO_TYPE_SYMLINK,
	TOMOYO_TYPE_CHROOT,
	TOMOYO_TYPE_UMOUNT,
	TOMOYO_MAX_PATH_OPERATION
};

enum tomoyo_memory_stat_type {
	TOMOYO_MEMORY_POLICY,
	TOMOYO_MEMORY_AUDIT,
	TOMOYO_MEMORY_QUERY,
	TOMOYO_MAX_MEMORY_STAT
};

enum tomoyo_mkdev_acl_index {
	TOMOYO_TYPE_MKBLOCK,
	TOMOYO_TYPE_MKCHAR,
	TOMOYO_MAX_MKDEV_OPERATION
};

/* Index numbers for access controls with two pathnames. */
enum tomoyo_path2_acl_index {
	TOMOYO_TYPE_LINK,
	TOMOYO_TYPE_RENAME,
	TOMOYO_TYPE_PIVOT_ROOT,
	TOMOYO_MAX_PATH2_OPERATION
};

/* Index numbers for access controls with one pathname and one number. */
enum tomoyo_path_number_acl_index {
	TOMOYO_TYPE_CREATE,
	TOMOYO_TYPE_MKDIR,
	TOMOYO_TYPE_MKFIFO,
	TOMOYO_TYPE_MKSOCK,
	TOMOYO_TYPE_IOCTL,
	TOMOYO_TYPE_CHMOD,
	TOMOYO_TYPE_CHOWN,
	TOMOYO_TYPE_CHGRP,
	TOMOYO_MAX_PATH_NUMBER_OPERATION
};

/* Index numbers for /sys/kernel/security/tomoyo/ interfaces. */
enum tomoyo_securityfs_interface_index {
	TOMOYO_DOMAINPOLICY,
	TOMOYO_EXCEPTIONPOLICY,
	TOMOYO_DOMAIN_STATUS,
	TOMOYO_PROCESS_STATUS,
	TOMOYO_MEMINFO,
	TOMOYO_SELFDOMAIN,
	TOMOYO_AUDIT,
	TOMOYO_VERSION,
	TOMOYO_PROFILE,
	TOMOYO_QUERY,
	TOMOYO_MANAGER
};

/* Index numbers for special mount operations. */
enum tomoyo_special_mount {
	TOMOYO_MOUNT_BIND,            /* mount --bind /source /dest   */
	TOMOYO_MOUNT_MOVE,            /* mount --move /old /new       */
	TOMOYO_MOUNT_REMOUNT,         /* mount -o remount /dir        */
	TOMOYO_MOUNT_MAKE_UNBINDABLE, /* mount --make-unbindable /dir */
	TOMOYO_MOUNT_MAKE_PRIVATE,    /* mount --make-private /dir    */
	TOMOYO_MOUNT_MAKE_SLAVE,      /* mount --make-slave /dir      */
	TOMOYO_MOUNT_MAKE_SHARED,     /* mount --make-shared /dir     */
	TOMOYO_MAX_SPECIAL_MOUNT
};

/* Index numbers for functionality. */
enum tomoyo_mac_index {
	TOMOYO_MAC_FILE_EXECUTE,
	TOMOYO_MAC_FILE_OPEN,
	TOMOYO_MAC_FILE_CREATE,
	TOMOYO_MAC_FILE_UNLINK,
	TOMOYO_MAC_FILE_GETATTR,
	TOMOYO_MAC_FILE_MKDIR,
	TOMOYO_MAC_FILE_RMDIR,
	TOMOYO_MAC_FILE_MKFIFO,
	TOMOYO_MAC_FILE_MKSOCK,
	TOMOYO_MAC_FILE_TRUNCATE,
	TOMOYO_MAC_FILE_SYMLINK,
	TOMOYO_MAC_FILE_MKBLOCK,
	TOMOYO_MAC_FILE_MKCHAR,
	TOMOYO_MAC_FILE_LINK,
	TOMOYO_MAC_FILE_RENAME,
	TOMOYO_MAC_FILE_CHMOD,
	TOMOYO_MAC_FILE_CHOWN,
	TOMOYO_MAC_FILE_CHGRP,
	TOMOYO_MAC_FILE_IOCTL,
	TOMOYO_MAC_FILE_CHROOT,
	TOMOYO_MAC_FILE_MOUNT,
	TOMOYO_MAC_FILE_UMOUNT,
	TOMOYO_MAC_FILE_PIVOT_ROOT,
	TOMOYO_MAX_MAC_INDEX
};

/* Index numbers for category of functionality. */
enum tomoyo_mac_category_index {
	TOMOYO_MAC_CATEGORY_FILE,
	TOMOYO_MAX_MAC_CATEGORY_INDEX
};

/*
 * Retry this request. Returned by tomoyo_supervisor() if policy violation has
 * occurred in enforcing mode and the userspace daemon decided to retry.
 *
 * We must choose a positive value in order to distinguish "granted" (which is
 * 0) and "rejected" (which is a negative value) and "retry".
 */
#define TOMOYO_RETRY_REQUEST 1

/* Index numbers for profile's PREFERENCE values. */
enum tomoyo_pref_index {
	TOMOYO_PREF_MAX_AUDIT_LOG,
	TOMOYO_PREF_MAX_LEARNING_ENTRY,
	TOMOYO_MAX_PREF
};

/********** Structure definitions. **********/

/* Common header for holding ACL entries. */
struct tomoyo_acl_head {
	struct list_head list;
	bool is_deleted;
} __packed;

/* Common header for shared entries. */
struct tomoyo_shared_acl_head {
	struct list_head list;
	atomic_t users;
} __packed;

struct tomoyo_policy_namespace;

/* Structure for request info. */
struct tomoyo_request_info {
	struct tomoyo_domain_info *domain;
	/* For holding parameters. */
	union {
		struct {
			const struct tomoyo_path_info *filename;
			/* For using wildcards at tomoyo_find_next_domain(). */
			const struct tomoyo_path_info *matched_path;
			/* One of values in "enum tomoyo_path_acl_index". */
			u8 operation;
		} path;
		struct {
			const struct tomoyo_path_info *filename1;
			const struct tomoyo_path_info *filename2;
			/* One of values in "enum tomoyo_path2_acl_index". */
			u8 operation;
		} path2;
		struct {
			const struct tomoyo_path_info *filename;
			unsigned int mode;
			unsigned int major;
			unsigned int minor;
			/* One of values in "enum tomoyo_mkdev_acl_index". */
			u8 operation;
		} mkdev;
		struct {
			const struct tomoyo_path_info *filename;
			unsigned long number;
			/*
			 * One of values in
			 * "enum tomoyo_path_number_acl_index".
			 */
			u8 operation;
		} path_number;
		struct {
			const struct tomoyo_path_info *type;
			const struct tomoyo_path_info *dir;
			const struct tomoyo_path_info *dev;
			unsigned long flags;
			int need_dev;
		} mount;
	} param;
	u8 param_type;
	bool granted;
	u8 retry;
	u8 profile;
	u8 mode; /* One of tomoyo_mode_index . */
	u8 type;
};

/* Structure for holding a token. */
struct tomoyo_path_info {
	const char *name;
	u32 hash;          /* = full_name_hash(name, strlen(name)) */
	u16 const_len;     /* = tomoyo_const_part_length(name)     */
	bool is_dir;       /* = tomoyo_strendswith(name, "/")      */
	bool is_patterned; /* = tomoyo_path_contains_pattern(name) */
};

/* Structure for holding string data. */
struct tomoyo_name {
	struct tomoyo_shared_acl_head head;
	struct tomoyo_path_info entry;
};

/* Structure for holding a word. */
struct tomoyo_name_union {
	/* Either @filename or @group is NULL. */
	const struct tomoyo_path_info *filename;
	struct tomoyo_group *group;
};

/* Structure for holding a number. */
struct tomoyo_number_union {
	unsigned long values[2];
	struct tomoyo_group *group; /* Maybe NULL. */
	/* One of values in "enum tomoyo_value_type". */
	u8 value_type[2];
};

/* Structure for "path_group"/"number_group" directive. */
struct tomoyo_group {
	struct tomoyo_shared_acl_head head;
	const struct tomoyo_path_info *group_name;
	struct list_head member_list;
};

/* Structure for "path_group" directive. */
struct tomoyo_path_group {
	struct tomoyo_acl_head head;
	const struct tomoyo_path_info *member_name;
};

/* Structure for "number_group" directive. */
struct tomoyo_number_group {
	struct tomoyo_acl_head head;
	struct tomoyo_number_union number;
};

/* Common header for individual entries. */
struct tomoyo_acl_info {
	struct list_head list;
	bool is_deleted;
	u8 type; /* One of values in "enum tomoyo_acl_entry_type_index". */
} __packed;

/* Structure for domain information. */
struct tomoyo_domain_info {
	struct list_head list;
	struct list_head acl_info_list;
	/* Name of this domain. Never NULL.          */
	const struct tomoyo_path_info *domainname;
	/* Namespace for this domain. Never NULL. */
	struct tomoyo_policy_namespace *ns;
	u8 profile;        /* Profile number to use. */
	u8 group;          /* Group number to use.   */
	bool is_deleted;   /* Delete flag.           */
	bool flags[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
	atomic_t users; /* Number of referring credentials. */
};

/*
 * Structure for "file execute", "file read", "file write", "file append",
 * "file unlink", "file getattr", "file rmdir", "file truncate",
 * "file symlink", "file chroot" and "file unmount" directive.
 */
struct tomoyo_path_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_ACL */
	u16 perm; /* Bitmask of values in "enum tomoyo_path_acl_index". */
	struct tomoyo_name_union name;
};

/*
 * Structure for "file create", "file mkdir", "file mkfifo", "file mksock",
 * "file ioctl", "file chmod", "file chown" and "file chgrp" directive.
 */
struct tomoyo_path_number_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH_NUMBER_ACL */
	/* Bitmask of values in "enum tomoyo_path_number_acl_index". */
	u8 perm;
	struct tomoyo_name_union name;
	struct tomoyo_number_union number;
};

/* Structure for "file mkblock" and "file mkchar" directive. */
struct tomoyo_mkdev_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MKDEV_ACL */
	u8 perm; /* Bitmask of values in "enum tomoyo_mkdev_acl_index". */
	struct tomoyo_name_union name;
	struct tomoyo_number_union mode;
	struct tomoyo_number_union major;
	struct tomoyo_number_union minor;
};

/*
 * Structure for "file rename", "file link" and "file pivot_root" directive.
 */
struct tomoyo_path2_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_PATH2_ACL */
	u8 perm; /* Bitmask of values in "enum tomoyo_path2_acl_index". */
	struct tomoyo_name_union name1;
	struct tomoyo_name_union name2;
};

/* Structure for "file mount" directive. */
struct tomoyo_mount_acl {
	struct tomoyo_acl_info head; /* type = TOMOYO_TYPE_MOUNT_ACL */
	struct tomoyo_name_union dev_name;
	struct tomoyo_name_union dir_name;
	struct tomoyo_name_union fs_type;
	struct tomoyo_number_union flags;
};

/* Structure for holding a line from /sys/kernel/security/tomoyo/ interface. */
struct tomoyo_acl_param {
	char *data;
	struct list_head *list;
	struct tomoyo_policy_namespace *ns;
	bool is_delete;
};

#define TOMOYO_MAX_IO_READ_QUEUE 64

/*
 * Structure for reading/writing policy via /sys/kernel/security/tomoyo
 * interfaces.
 */
struct tomoyo_io_buffer {
	void (*read) (struct tomoyo_io_buffer *);
	int (*write) (struct tomoyo_io_buffer *);
	int (*poll) (struct file *file, poll_table *wait);
	/* Exclusive lock for this structure.   */
	struct mutex io_sem;
	char __user *read_user_buf;
	size_t read_user_buf_avail;
	struct {
		struct list_head *ns;
		struct list_head *domain;
		struct list_head *group;
		struct list_head *acl;
		size_t avail;
		unsigned int step;
		unsigned int query_index;
		u16 index;
		u8 acl_group_index;
		u8 bit;
		u8 w_pos;
		bool eof;
		bool print_this_domain_only;
		bool print_transition_related_only;
		const char *w[TOMOYO_MAX_IO_READ_QUEUE];
	} r;
	struct {
		struct tomoyo_policy_namespace *ns;
		/* The position currently writing to.   */
		struct tomoyo_domain_info *domain;
		/* Bytes available for writing.         */
		size_t avail;
		bool is_delete;
	} w;
	/* Buffer for reading.                  */
	char *read_buf;
	/* Size of read buffer.                 */
	size_t readbuf_size;
	/* Buffer for writing.                  */
	char *write_buf;
	/* Size of write buffer.                */
	size_t writebuf_size;
	/* Type of this interface.              */
	enum tomoyo_securityfs_interface_index type;
	/* Users counter protected by tomoyo_io_buffer_list_lock. */
	u8 users;
	/* List for telling GC not to kfree() elements. */
	struct list_head list;
};

/*
 * Structure for "initialize_domain"/"no_initialize_domain"/"keep_domain"/
 * "no_keep_domain" keyword.
 */
struct tomoyo_transition_control {
	struct tomoyo_acl_head head;
	u8 type; /* One of values in "enum tomoyo_transition_type".  */
	/* True if the domainname is tomoyo_get_last_name(). */
	bool is_last_name;
	const struct tomoyo_path_info *domainname; /* Maybe NULL */
	const struct tomoyo_path_info *program;    /* Maybe NULL */
};

/* Structure for "aggregator" keyword. */
struct tomoyo_aggregator {
	struct tomoyo_acl_head head;
	const struct tomoyo_path_info *original_name;
	const struct tomoyo_path_info *aggregated_name;
};

/* Structure for policy manager. */
struct tomoyo_manager {
	struct tomoyo_acl_head head;
	bool is_domain;  /* True if manager is a domainname. */
	/* A path to program or a domainname. */
	const struct tomoyo_path_info *manager;
};

struct tomoyo_preference {
	unsigned int learning_max_entry;
	bool enforcing_verbose;
	bool learning_verbose;
	bool permissive_verbose;
};

/* Structure for /sys/kernel/security/tomnoyo/profile interface. */
struct tomoyo_profile {
	const struct tomoyo_path_info *comment;
	struct tomoyo_preference *learning;
	struct tomoyo_preference *permissive;
	struct tomoyo_preference *enforcing;
	struct tomoyo_preference preference;
	u8 default_config;
	u8 config[TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX];
	unsigned int pref[TOMOYO_MAX_PREF];
};

/* Structure for representing YYYY/MM/DD hh/mm/ss. */
struct tomoyo_time {
	u16 year;
	u8 month;
	u8 day;
	u8 hour;
	u8 min;
	u8 sec;
};

/* Structure for policy namespace. */
struct tomoyo_policy_namespace {
	/* Profile table. Memory is allocated as needed. */
	struct tomoyo_profile *profile_ptr[TOMOYO_MAX_PROFILES];
	/* List of "struct tomoyo_group". */
	struct list_head group_list[TOMOYO_MAX_GROUP];
	/* List of policy. */
	struct list_head policy_list[TOMOYO_MAX_POLICY];
	/* The global ACL referred by "use_group" keyword. */
	struct list_head acl_group[TOMOYO_MAX_ACL_GROUPS];
	/* List for connecting to tomoyo_namespace_list list. */
	struct list_head namespace_list;
	/* Profile version. Currently only 20100903 is defined. */
	unsigned int profile_version;
	/* Name of this namespace (e.g. "<kernel>", "</usr/sbin/httpd>" ). */
	const char *name;
};

/********** Function prototypes. **********/

void tomoyo_init_policy_namespace(struct tomoyo_policy_namespace *ns);
bool tomoyo_str_starts(char **src, const char *find);
const char *tomoyo_get_exe(void);
void tomoyo_normalize_line(unsigned char *buffer);
void tomoyo_check_profile(void);
int tomoyo_open_control(const u8 type, struct file *file);
int tomoyo_close_control(struct tomoyo_io_buffer *head);
int tomoyo_poll_control(struct file *file, poll_table *wait);
ssize_t tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
			    const int buffer_len);
ssize_t tomoyo_write_control(struct tomoyo_io_buffer *head,
			     const char __user *buffer, const int buffer_len);
bool tomoyo_domain_quota_is_ok(struct tomoyo_request_info *r);
void tomoyo_warn_oom(const char *function);
const struct tomoyo_path_info *
tomoyo_compare_name_union(const struct tomoyo_path_info *name,
			  const struct tomoyo_name_union *ptr);
bool tomoyo_compare_number_union(const unsigned long value,
				 const struct tomoyo_number_union *ptr);
int tomoyo_get_mode(const struct tomoyo_policy_namespace *ns, const u8 profile,
		    const u8 index);
void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
	__attribute__ ((format(printf, 2, 3)));
bool tomoyo_correct_domain(const unsigned char *domainname);
bool tomoyo_correct_path(const char *filename);
bool tomoyo_correct_word(const char *string);
bool tomoyo_domain_def(const unsigned char *buffer);
bool tomoyo_parse_name_union(struct tomoyo_acl_param *param,
			     struct tomoyo_name_union *ptr);
const struct tomoyo_path_info *
tomoyo_path_matches_group(const struct tomoyo_path_info *pathname,
			  const struct tomoyo_group *group);
bool tomoyo_number_matches_group(const unsigned long min,
				 const unsigned long max,
				 const struct tomoyo_group *group);
bool tomoyo_path_matches_pattern(const struct tomoyo_path_info *filename,
				 const struct tomoyo_path_info *pattern);
bool tomoyo_parse_number_union(struct tomoyo_acl_param *param,
			       struct tomoyo_number_union *ptr);
bool tomoyo_tokenize(char *buffer, char *w[], size_t size);
bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain);
int tomoyo_init_request_info(struct tomoyo_request_info *r,
			     struct tomoyo_domain_info *domain,
			     const u8 index);
int tomoyo_mount_permission(char *dev_name, struct path *path,
			    const char *type, unsigned long flags,
			    void *data_page);
int tomoyo_write_aggregator(struct tomoyo_acl_param *param);
int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
				    const u8 type);
int tomoyo_write_file(struct tomoyo_acl_param *param);
int tomoyo_write_group(struct tomoyo_acl_param *param, const u8 type);
int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
     __attribute__ ((format(printf, 2, 3)));
struct tomoyo_domain_info *tomoyo_find_domain(const char *domainname);
struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
						const bool transit);
struct tomoyo_profile *tomoyo_profile(const struct tomoyo_policy_namespace *ns,
				      const u8 profile);
struct tomoyo_policy_namespace *tomoyo_assign_namespace
(const char *domainname);
struct tomoyo_group *tomoyo_get_group(struct tomoyo_acl_param *param,
				      const u8 idx);
unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
				const u8 index);
void tomoyo_fill_path_info(struct tomoyo_path_info *ptr);
void tomoyo_load_policy(const char *filename);
void tomoyo_put_number_union(struct tomoyo_number_union *ptr);
char *tomoyo_encode(const char *str);
char *tomoyo_realpath_nofollow(const char *pathname);
char *tomoyo_realpath_from_path(struct path *path);
bool tomoyo_memory_ok(void *ptr);
void *tomoyo_commit_ok(void *data, const unsigned int size);
const struct tomoyo_path_info *tomoyo_get_name(const char *name);
void tomoyo_read_memory_counter(struct tomoyo_io_buffer *head);
int tomoyo_write_memory_quota(struct tomoyo_io_buffer *head);
void __init tomoyo_mm_init(void);
int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
			   const struct tomoyo_path_info *filename);
int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
				 struct path *path, const int flag);
int tomoyo_path_number_perm(const u8 operation, struct path *path,
			    unsigned long number);
int tomoyo_mkdev_perm(const u8 operation, struct path *path,
		      const unsigned int mode, unsigned int dev);
int tomoyo_path_perm(const u8 operation, struct path *path);
int tomoyo_path2_perm(const u8 operation, struct path *path1,
		      struct path *path2);
int tomoyo_find_next_domain(struct linux_binprm *bprm);
void tomoyo_print_ulong(char *buffer, const int buffer_len,
			const unsigned long value, const u8 type);
void tomoyo_put_name_union(struct tomoyo_name_union *ptr);
void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register);
void tomoyo_memory_free(void *ptr);
int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
			 struct tomoyo_acl_param *param,
			 bool (*check_duplicate) (const struct tomoyo_acl_info
						  *,
						  const struct tomoyo_acl_info
						  *),
			 bool (*merge_duplicate) (struct tomoyo_acl_info *,
						  struct tomoyo_acl_info *,
						  const bool));
int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
			 struct tomoyo_acl_param *param,
			 bool (*check_duplicate) (const struct tomoyo_acl_head
						  *,
						  const struct tomoyo_acl_head
						  *));
void tomoyo_check_acl(struct tomoyo_request_info *r,
		      bool (*check_entry) (struct tomoyo_request_info *,
					   const struct tomoyo_acl_info *));
char *tomoyo_read_token(struct tomoyo_acl_param *param);
bool tomoyo_permstr(const char *string, const char *keyword);

const char *tomoyo_yesno(const unsigned int value);
void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
	__attribute__ ((format(printf, 2, 3)));
void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
		       va_list args);
void tomoyo_read_log(struct tomoyo_io_buffer *head);
int tomoyo_poll_log(struct file *file, poll_table *wait);
char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
		      va_list args);

/********** External variable definitions. **********/

/* Lock for GC. */
extern struct srcu_struct tomoyo_ss;

/* The list for "struct tomoyo_domain_info". */
extern struct list_head tomoyo_domain_list;

extern struct list_head tomoyo_name_list[TOMOYO_MAX_HASH];

/* Lock for protecting policy. */
extern struct mutex tomoyo_policy_lock;

/* Has /sbin/init started? */
extern bool tomoyo_policy_loaded;

/* The kernel's domain. */
extern struct tomoyo_domain_info tomoyo_kernel_domain;
extern struct tomoyo_policy_namespace tomoyo_kernel_namespace;
extern struct list_head tomoyo_namespace_list;

extern const char * const tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX +
					      TOMOYO_MAX_MAC_CATEGORY_INDEX];
extern const char * const tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION];
extern const u8 tomoyo_index2category[TOMOYO_MAX_MAC_INDEX];


extern const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION];
extern const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION];
extern const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION];

extern const char * const tomoyo_dif[TOMOYO_MAX_DOMAIN_INFO_FLAGS];
extern const char * const tomoyo_mode[TOMOYO_CONFIG_MAX_MODE];
extern unsigned int tomoyo_memory_quota[TOMOYO_MAX_MEMORY_STAT];
extern unsigned int tomoyo_memory_used[TOMOYO_MAX_MEMORY_STAT];

/********** Inlined functions. **********/

/**
 * tomoyo_read_lock - Take lock for protecting policy.
 *
 * Returns index number for tomoyo_read_unlock().
 */
static inline int tomoyo_read_lock(void)
{
	return srcu_read_lock(&tomoyo_ss);
}

/**
 * tomoyo_read_unlock - Release lock for protecting policy.
 *
 * @idx: Index number returned by tomoyo_read_lock().
 *
 * Returns nothing.
 */
static inline void tomoyo_read_unlock(int idx)
{
	srcu_read_unlock(&tomoyo_ss, idx);
}

/**
 * tomoyo_pathcmp - strcmp() for "struct tomoyo_path_info" structure.
 *
 * @a: Pointer to "struct tomoyo_path_info".
 * @b: Pointer to "struct tomoyo_path_info".
 *
 * Returns true if @a == @b, false otherwise.
 */
static inline bool tomoyo_pathcmp(const struct tomoyo_path_info *a,
				  const struct tomoyo_path_info *b)
{
	return a->hash != b->hash || strcmp(a->name, b->name);
}

/**
 * tomoyo_put_name - Drop reference on "struct tomoyo_name".
 *
 * @name: Pointer to "struct tomoyo_path_info". Maybe NULL.
 *
 * Returns nothing.
 */
static inline void tomoyo_put_name(const struct tomoyo_path_info *name)
{
	if (name) {
		struct tomoyo_name *ptr =
			container_of(name, typeof(*ptr), entry);
		atomic_dec(&ptr->head.users);
	}
}

/**
 * tomoyo_put_group - Drop reference on "struct tomoyo_group".
 *
 * @group: Pointer to "struct tomoyo_group". Maybe NULL.
 *
 * Returns nothing.
 */
static inline void tomoyo_put_group(struct tomoyo_group *group)
{
	if (group)
		atomic_dec(&group->head.users);
}

/**
 * tomoyo_domain - Get "struct tomoyo_domain_info" for current thread.
 *
 * Returns pointer to "struct tomoyo_domain_info" for current thread.
 */
static inline struct tomoyo_domain_info *tomoyo_domain(void)
{
	return current_cred()->security;
}

/**
 * tomoyo_real_domain - Get "struct tomoyo_domain_info" for specified thread.
 *
 * @task: Pointer to "struct task_struct".
 *
 * Returns pointer to "struct tomoyo_security" for specified thread.
 */
static inline struct tomoyo_domain_info *tomoyo_real_domain(struct task_struct
							    *task)
{
	return task_cred_xxx(task, security);
}

/**
 * tomoyo_same_name_union - Check for duplicated "struct tomoyo_name_union" entry.
 *
 * @a: Pointer to "struct tomoyo_name_union".
 * @b: Pointer to "struct tomoyo_name_union".
 *
 * Returns true if @a == @b, false otherwise.
 */
static inline bool tomoyo_same_name_union
(const struct tomoyo_name_union *a, const struct tomoyo_name_union *b)
{
	return a->filename == b->filename && a->group == b->group;
}

/**
 * tomoyo_same_number_union - Check for duplicated "struct tomoyo_number_union" entry.
 *
 * @a: Pointer to "struct tomoyo_number_union".
 * @b: Pointer to "struct tomoyo_number_union".
 *
 * Returns true if @a == @b, false otherwise.
 */
static inline bool tomoyo_same_number_union
(const struct tomoyo_number_union *a, const struct tomoyo_number_union *b)
{
	return a->values[0] == b->values[0] && a->values[1] == b->values[1] &&
		a->group == b->group && a->value_type[0] == b->value_type[0] &&
		a->value_type[1] == b->value_type[1];
}

/**
 * tomoyo_current_namespace - Get "struct tomoyo_policy_namespace" for current thread.
 *
 * Returns pointer to "struct tomoyo_policy_namespace" for current thread.
 */
static inline struct tomoyo_policy_namespace *tomoyo_current_namespace(void)
{
	return tomoyo_domain()->ns;
}

#if defined(CONFIG_SLOB)

/**
 * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
 *
 * @size: Size to be rounded up.
 *
 * Returns @size.
 *
 * Since SLOB does not round up, this function simply returns @size.
 */
static inline int tomoyo_round2(size_t size)
{
	return size;
}

#else

/**
 * tomoyo_round2 - Round up to power of 2 for calculating memory usage.
 *
 * @size: Size to be rounded up.
 *
 * Returns rounded size.
 *
 * Strictly speaking, SLAB may be able to allocate (e.g.) 96 bytes instead of
 * (e.g.) 128 bytes.
 */
static inline int tomoyo_round2(size_t size)
{
#if PAGE_SIZE == 4096
	size_t bsize = 32;
#else
	size_t bsize = 64;
#endif
	if (!size)
		return 0;
	while (size > bsize)
		bsize <<= 1;
	return bsize;
}

#endif

/**
 * list_for_each_cookie - iterate over a list with cookie.
 * @pos:        the &struct list_head to use as a loop cursor.
 * @head:       the head for your list.
 */
#define list_for_each_cookie(pos, head)					\
	if (!pos)							\
		pos =  srcu_dereference((head)->next, &tomoyo_ss);	\
	for ( ; pos != (head); pos = srcu_dereference(pos->next, &tomoyo_ss))

#endif /* !defined(_SECURITY_TOMOYO_COMMON_H) */