security/smack/smack.h - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
  *
  *      This program is free software; you can redistribute it and/or modify
  *      it under the terms of the GNU General Public License as published by
  *      the Free Software Foundation, version 2.
  *
  * Author:
  *      Casey Schaufler <casey@schaufler-ca.com>
  *
  */

 #ifndef _SECURITY_SMACK_H
 #define _SECURITY_SMACK_H

 #include <linux/capability.h>
 #include <linux/spinlock.h>
 #include <linux/lsm_hooks.h>
 #include <linux/in.h>
 #if IS_ENABLED(CONFIG_IPV6)
 #include <linux/in6.h>
 #endif /* CONFIG_IPV6 */
 #include <net/netlabel.h>
 #include <linux/list.h>
 #include <linux/rculist.h>
 #include <linux/lsm_audit.h>

 /*
  * Use IPv6 port labeling if IPv6 is enabled and secmarks
  * are not being used.
  */
 #if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
 #define SMACK_IPV6_PORT_LABELING 1
 #endif

 #if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
 #define SMACK_IPV6_SECMARK_LABELING 1
 #endif

 /*
  * Smack labels were limited to 23 characters for a long time.
  */
 #define SMK_LABELLEN	24
 #define SMK_LONGLABEL	256

 /*
  * This is the repository for labels seen so that it is
  * not necessary to keep allocating tiny chuncks of memory
  * and so that they can be shared.
  *
  * Labels are never modified in place. Anytime a label
  * is imported (e.g. xattrset on a file) the list is checked
  * for it and it is added if it doesn't exist. The address
  * is passed out in either case. Entries are added, but
  * never deleted.
  *
  * Since labels are hanging around anyway it doesn't
  * hurt to maintain a secid for those awkward situations
  * where kernel components that ought to use LSM independent
  * interfaces don't. The secid should go away when all of
  * these components have been repaired.
  *
  * The cipso value associated with the label gets stored here, too.
  *
  * Keep the access rules for this subject label here so that
  * the entire set of rules does not need to be examined every
  * time.
  */
 struct smack_known {
 	struct list_head		list;
 	struct hlist_node		smk_hashed;
 	char				*smk_known;
 	u32				smk_secid;
 	struct netlbl_lsm_secattr	smk_netlabel;	/* on wire labels */
 	struct list_head		smk_rules;	/* access rules */
 	struct mutex			smk_rules_lock;	/* lock for rules */
 };

 /*
  * Maximum number of bytes for the levels in a CIPSO IP option.
  * Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
  * bigger than can be used, and 24 is the next lower multiple
  * of 8, and there are too many issues if there isn't space set
  * aside for the terminating null byte.
  */
 #define SMK_CIPSOLEN	24

 struct superblock_smack {
 	struct smack_known	*smk_root;
 	struct smack_known	*smk_floor;
 	struct smack_known	*smk_hat;
 	struct smack_known	*smk_default;
 	int			smk_initialized;
 };

 struct socket_smack {
 	struct smack_known	*smk_out;	/* outbound label */
 	struct smack_known	*smk_in;	/* inbound label */
 	struct smack_known	*smk_packet;	/* TCP peer label */
 };

 /*
  * Inode smack data
  */
 struct inode_smack {
 	struct smack_known	*smk_inode;	/* label of the fso */
 	struct smack_known	*smk_task;	/* label of the task */
 	struct smack_known	*smk_mmap;	/* label of the mmap domain */
 	struct mutex		smk_lock;	/* initialization lock */
 	int			smk_flags;	/* smack inode flags */
 };

 struct task_smack {
 	struct smack_known	*smk_task;	/* label for access control */
 	struct smack_known	*smk_forked;	/* label when forked */
 	struct list_head	smk_rules;	/* per task access rules */
 	struct mutex		smk_rules_lock;	/* lock for the rules */
 };

 #define	SMK_INODE_INSTANT	0x01	/* inode is instantiated */
 #define	SMK_INODE_TRANSMUTE	0x02	/* directory is transmuting */
 #define	SMK_INODE_CHANGED	0x04	/* smack was transmuted */
 #define	SMK_INODE_IMPURE	0x08	/* involved in an impure transaction */

 /*
  * A label access rule.
  */
 struct smack_rule {
 	struct list_head	list;
 	struct smack_known	*smk_subject;
 	struct smack_known	*smk_object;
 	int			smk_access;
 };

 /*
  * An entry in the table identifying IPv4 hosts.
  */
 struct smk_net4addr {
 	struct list_head	list;
 	struct in_addr		smk_host;	/* network address */
 	struct in_addr		smk_mask;	/* network mask */
 	int			smk_masks;	/* mask size */
 	struct smack_known	*smk_label;	/* label */
 };

 #if IS_ENABLED(CONFIG_IPV6)
 /*
  * An entry in the table identifying IPv6 hosts.
  */
 struct smk_net6addr {
 	struct list_head	list;
 	struct in6_addr		smk_host;	/* network address */
 	struct in6_addr		smk_mask;	/* network mask */
 	int			smk_masks;	/* mask size */
 	struct smack_known	*smk_label;	/* label */
 };
 #endif /* CONFIG_IPV6 */

 #ifdef SMACK_IPV6_PORT_LABELING
 /*
  * An entry in the table identifying ports.
  */
 struct smk_port_label {
 	struct list_head	list;
 	struct sock		*smk_sock;	/* socket initialized on */
 	unsigned short		smk_port;	/* the port number */
 	struct smack_known	*smk_in;	/* inbound label */
 	struct smack_known	*smk_out;	/* outgoing label */
 };
 #endif /* SMACK_IPV6_PORT_LABELING */

 struct smack_onlycap {
 	struct list_head	list;
 	struct smack_known	*smk_label;
 };

 /* Super block security struct flags for mount options */
 #define FSDEFAULT_MNT	0x01
 #define FSFLOOR_MNT	0x02
 #define FSHAT_MNT	0x04
 #define FSROOT_MNT	0x08
 #define FSTRANS_MNT	0x10

 #define NUM_SMK_MNT_OPTS	5

 enum {
 	Opt_error = -1,
 	Opt_fsdefault = 1,
 	Opt_fsfloor = 2,
 	Opt_fshat = 3,
 	Opt_fsroot = 4,
 	Opt_fstransmute = 5,
 };

 /*
  * Mount options
  */
 #define SMK_FSDEFAULT	"smackfsdef="
 #define SMK_FSFLOOR	"smackfsfloor="
 #define SMK_FSHAT	"smackfshat="
 #define SMK_FSROOT	"smackfsroot="
 #define SMK_FSTRANS	"smackfstransmute="

 #define SMACK_DELETE_OPTION	"-DELETE"
 #define SMACK_CIPSO_OPTION 	"-CIPSO"

 /*
  * How communications on this socket are treated.
  * Usually it's determined by the underlying netlabel code
  * but there are certain cases, including single label hosts
  * and potentially single label interfaces for which the
  * treatment can not be known in advance.
  *
  * The possibility of additional labeling schemes being
  * introduced in the future exists as well.
  */
 #define SMACK_UNLABELED_SOCKET	0
 #define SMACK_CIPSO_SOCKET	1

 /*
  * CIPSO defaults.
  */
 #define SMACK_CIPSO_DOI_DEFAULT		3	/* Historical */
 #define SMACK_CIPSO_DOI_INVALID		-1	/* Not a DOI */
 #define SMACK_CIPSO_DIRECT_DEFAULT	250	/* Arbitrary */
 #define SMACK_CIPSO_MAPPED_DEFAULT	251	/* Also arbitrary */
 #define SMACK_CIPSO_MAXLEVEL            255     /* CIPSO 2.2 standard */
 /*
  * CIPSO 2.2 standard is 239, but Smack wants to use the
  * categories in a structured way that limits the value to
  * the bits in 23 bytes, hence the unusual number.
  */
 #define SMACK_CIPSO_MAXCATNUM           184     /* 23 * 8 */

 /*
  * Ptrace rules
  */
 #define SMACK_PTRACE_DEFAULT	0
 #define SMACK_PTRACE_EXACT	1
 #define SMACK_PTRACE_DRACONIAN	2
 #define SMACK_PTRACE_MAX	SMACK_PTRACE_DRACONIAN

 /*
  * Flags for untraditional access modes.
  * It shouldn't be necessary to avoid conflicts with definitions
  * in fs.h, but do so anyway.
  */
 #define MAY_TRANSMUTE	0x00001000	/* Controls directory labeling */
 #define MAY_LOCK	0x00002000	/* Locks should be writes, but ... */
 #define MAY_BRINGUP	0x00004000	/* Report use of this rule */

 #define SMACK_BRINGUP_ALLOW		1	/* Allow bringup mode */
 #define SMACK_UNCONFINED_SUBJECT	2	/* Allow unconfined label */
 #define SMACK_UNCONFINED_OBJECT		3	/* Allow unconfined label */

 /*
  * Just to make the common cases easier to deal with
  */
 #define MAY_ANYREAD	(MAY_READ | MAY_EXEC)
 #define MAY_READWRITE	(MAY_READ | MAY_WRITE)
 #define MAY_NOT		0

 /*
  * Number of access types used by Smack (rwxatlb)
  */
 #define SMK_NUM_ACCESS_TYPE 7

 /* SMACK data */
 struct smack_audit_data {
 	const char *function;
 	char *subject;
 	char *object;
 	char *request;
 	int result;
 };

 /*
  * Smack audit data; is empty if CONFIG_AUDIT not set
  * to save some stack
  */
 struct smk_audit_info {
 #ifdef CONFIG_AUDIT
 	struct common_audit_data a;
 	struct smack_audit_data sad;
 #endif
 };

 /*
  * These functions are in smack_access.c
  */
 int smk_access_entry(char *, char *, struct list_head *);
 int smk_access(struct smack_known *, struct smack_known *,
 	       int, struct smk_audit_info *);
 int smk_tskacc(struct task_smack *, struct smack_known *,
 	       u32, struct smk_audit_info *);
 int smk_curacc(struct smack_known *, u32, struct smk_audit_info *);
 struct smack_known *smack_from_secid(const u32);
 char *smk_parse_smack(const char *string, int len);
 int smk_netlbl_mls(int, char *, struct netlbl_lsm_secattr *, int);
 struct smack_known *smk_import_entry(const char *, int);
 void smk_insert_entry(struct smack_known *skp);
 struct smack_known *smk_find_entry(const char *);
 int smack_privileged(int cap);

 /*
  * Shared data.
  */
 extern int smack_enabled;
 extern int smack_cipso_direct;
 extern int smack_cipso_mapped;
 extern struct smack_known *smack_net_ambient;
 extern struct smack_known *smack_syslog_label;
 #ifdef CONFIG_SECURITY_SMACK_BRINGUP
 extern struct smack_known *smack_unconfined;
 #endif
 extern int smack_ptrace_rule;

 extern struct smack_known smack_known_floor;
 extern struct smack_known smack_known_hat;
 extern struct smack_known smack_known_huh;
 extern struct smack_known smack_known_invalid;
 extern struct smack_known smack_known_star;
 extern struct smack_known smack_known_web;

 extern struct mutex	smack_known_lock;
 extern struct list_head smack_known_list;
 extern struct list_head smk_net4addr_list;
 #if IS_ENABLED(CONFIG_IPV6)
 extern struct list_head smk_net6addr_list;
 #endif /* CONFIG_IPV6 */

 extern struct mutex     smack_onlycap_lock;
 extern struct list_head smack_onlycap_list;

 #define SMACK_HASH_SLOTS 16
 extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];

 /*
  * Is the directory transmuting?
  */
 static inline int smk_inode_transmutable(const struct inode *isp)
 {
 	struct inode_smack *sip = isp->i_security;
 	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
 }

 /*
  * Present a pointer to the smack label entry in an inode blob.
  */
 static inline struct smack_known *smk_of_inode(const struct inode *isp)
 {
 	struct inode_smack *sip = isp->i_security;
 	return sip->smk_inode;
 }

 /*
  * Present a pointer to the smack label entry in an task blob.
  */
 static inline struct smack_known *smk_of_task(const struct task_smack *tsp)
 {
 	return tsp->smk_task;
 }

 static inline struct smack_known *smk_of_task_struct(const struct task_struct *t)
 {
 	struct smack_known *skp;

 	rcu_read_lock();
 	skp = smk_of_task(__task_cred(t)->security);
 	rcu_read_unlock();
 	return skp;
 }

 /*
  * Present a pointer to the forked smack label entry in an task blob.
  */
 static inline struct smack_known *smk_of_forked(const struct task_smack *tsp)
 {
 	return tsp->smk_forked;
 }

 /*
  * Present a pointer to the smack label in the current task blob.
  */
 static inline struct smack_known *smk_of_current(void)
 {
 	return smk_of_task(current_security());
 }

 /*
  * logging functions
  */
 #define SMACK_AUDIT_DENIED 0x1
 #define SMACK_AUDIT_ACCEPT 0x2
 extern int log_policy;

 void smack_log(char *subject_label, char *object_label,
 		int request,
 		int result, struct smk_audit_info *auditdata);

 #ifdef CONFIG_AUDIT

 /*
  * some inline functions to set up audit data
  * they do nothing if CONFIG_AUDIT is not set
  *
  */
 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
 			       char type)
 {
 	memset(&a->sad, 0, sizeof(a->sad));
 	a->a.type = type;
 	a->a.smack_audit_data = &a->sad;
 	a->a.smack_audit_data->function = func;
 }

 static inline void smk_ad_init_net(struct smk_audit_info *a, const char *func,
 				   char type, struct lsm_network_audit *net)
 {
 	smk_ad_init(a, func, type);
 	memset(net, 0, sizeof(*net));
 	a->a.u.net = net;
 }

 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
 					 struct task_struct *t)
 {
 	a->a.u.tsk = t;
 }
 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
 						    struct dentry *d)
 {
 	a->a.u.dentry = d;
 }
 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
 					      struct inode *i)
 {
 	a->a.u.inode = i;
 }
 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
 					     struct path p)
 {
 	a->a.u.path = p;
 }
 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
 					    struct sock *sk)
 {
 	a->a.u.net->sk = sk;
 }

 #else /* no AUDIT */

 static inline void smk_ad_init(struct smk_audit_info *a, const char *func,
 			       char type)
 {
 }
 static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
 					 struct task_struct *t)
 {
 }
 static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
 						    struct dentry *d)
 {
 }
 static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
 						 struct vfsmount *m)
 {
 }
 static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
 					      struct inode *i)
 {
 }
 static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
 					     struct path p)
 {
 }
 static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
 					    struct sock *sk)
 {
 }
 #endif

 #endif  /* _SECURITY_SMACK_H */
	/*
	* Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, version 2.
	*
	* Author:
	* Casey Schaufler <casey@schaufler-ca.com>
	*
	*/

	#ifndef _SECURITY_SMACK_H
	#define _SECURITY_SMACK_H

	#include <linux/capability.h>
	#include <linux/spinlock.h>
	#include <linux/lsm_hooks.h>
	#include <linux/in.h>
	#if IS_ENABLED(CONFIG_IPV6)
	#include <linux/in6.h>
	#endif /* CONFIG_IPV6 */
	#include <net/netlabel.h>
	#include <linux/list.h>
	#include <linux/rculist.h>
	#include <linux/lsm_audit.h>

	/*
	* Use IPv6 port labeling if IPv6 is enabled and secmarks
	* are not being used.
	*/
	#if IS_ENABLED(CONFIG_IPV6) && !defined(CONFIG_SECURITY_SMACK_NETFILTER)
	#define SMACK_IPV6_PORT_LABELING 1
	#endif

	#if IS_ENABLED(CONFIG_IPV6) && defined(CONFIG_SECURITY_SMACK_NETFILTER)
	#define SMACK_IPV6_SECMARK_LABELING 1
	#endif

	/*
	* Smack labels were limited to 23 characters for a long time.
	*/
	#define SMK_LABELLEN 24
	#define SMK_LONGLABEL 256

	/*
	* This is the repository for labels seen so that it is
	* not necessary to keep allocating tiny chuncks of memory
	* and so that they can be shared.
	*
	* Labels are never modified in place. Anytime a label
	* is imported (e.g. xattrset on a file) the list is checked
	* for it and it is added if it doesn't exist. The address
	* is passed out in either case. Entries are added, but
	* never deleted.
	*
	* Since labels are hanging around anyway it doesn't
	* hurt to maintain a secid for those awkward situations
	* where kernel components that ought to use LSM independent
	* interfaces don't. The secid should go away when all of
	* these components have been repaired.
	*
	* The cipso value associated with the label gets stored here, too.
	*
	* Keep the access rules for this subject label here so that
	* the entire set of rules does not need to be examined every
	* time.
	*/
	struct smack_known {
	struct list_head list;
	struct hlist_node smk_hashed;
	char *smk_known;
	u32 smk_secid;
	struct netlbl_lsm_secattr smk_netlabel; /* on wire labels */
	struct list_head smk_rules; /* access rules */
	struct mutex smk_rules_lock; /* lock for rules */
	};

	/*
	* Maximum number of bytes for the levels in a CIPSO IP option.
	* Why 23? CIPSO is constrained to 30, so a 32 byte buffer is
	* bigger than can be used, and 24 is the next lower multiple
	* of 8, and there are too many issues if there isn't space set
	* aside for the terminating null byte.
	*/
	#define SMK_CIPSOLEN 24

	struct superblock_smack {
	struct smack_known *smk_root;
	struct smack_known *smk_floor;
	struct smack_known *smk_hat;
	struct smack_known *smk_default;
	int smk_initialized;
	};

	struct socket_smack {
	struct smack_known smk_out; / outbound label */
	struct smack_known smk_in; / inbound label */
	struct smack_known smk_packet; / TCP peer label */
	};

	/*
	* Inode smack data
	*/
	struct inode_smack {
	struct smack_known smk_inode; / label of the fso */
	struct smack_known smk_task; / label of the task */
	struct smack_known smk_mmap; / label of the mmap domain */
	struct mutex smk_lock; /* initialization lock */
	int smk_flags; /* smack inode flags */
	};

	struct task_smack {
	struct smack_known smk_task; / label for access control */
	struct smack_known smk_forked; / label when forked */
	struct list_head smk_rules; /* per task access rules */
	struct mutex smk_rules_lock; /* lock for the rules */
	};

	#define SMK_INODE_INSTANT 0x01 /* inode is instantiated */
	#define SMK_INODE_TRANSMUTE 0x02 /* directory is transmuting */
	#define SMK_INODE_CHANGED 0x04 /* smack was transmuted */
	#define SMK_INODE_IMPURE 0x08 /* involved in an impure transaction */

	/*
	* A label access rule.
	*/
	struct smack_rule {
	struct list_head list;
	struct smack_known *smk_subject;
	struct smack_known *smk_object;
	int smk_access;
	};

	/*
	* An entry in the table identifying IPv4 hosts.
	*/
	struct smk_net4addr {
	struct list_head list;
	struct in_addr smk_host; /* network address */
	struct in_addr smk_mask; /* network mask */
	int smk_masks; /* mask size */
	struct smack_known smk_label; / label */
	};

	#if IS_ENABLED(CONFIG_IPV6)
	/*
	* An entry in the table identifying IPv6 hosts.
	*/
	struct smk_net6addr {
	struct list_head list;
	struct in6_addr smk_host; /* network address */
	struct in6_addr smk_mask; /* network mask */
	int smk_masks; /* mask size */
	struct smack_known smk_label; / label */
	};
	#endif /* CONFIG_IPV6 */

	#ifdef SMACK_IPV6_PORT_LABELING
	/*
	* An entry in the table identifying ports.
	*/
	struct smk_port_label {
	struct list_head list;
	struct sock smk_sock; / socket initialized on */
	unsigned short smk_port; /* the port number */
	struct smack_known smk_in; / inbound label */
	struct smack_known smk_out; / outgoing label */
	};
	#endif /* SMACK_IPV6_PORT_LABELING */

	struct smack_onlycap {
	struct list_head list;
	struct smack_known *smk_label;
	};

	/* Super block security struct flags for mount options */
	#define FSDEFAULT_MNT 0x01
	#define FSFLOOR_MNT 0x02
	#define FSHAT_MNT 0x04
	#define FSROOT_MNT 0x08
	#define FSTRANS_MNT 0x10

	#define NUM_SMK_MNT_OPTS 5

	enum {
	Opt_error = -1,
	Opt_fsdefault = 1,
	Opt_fsfloor = 2,
	Opt_fshat = 3,
	Opt_fsroot = 4,
	Opt_fstransmute = 5,
	};

	/*
	* Mount options
	*/
	#define SMK_FSDEFAULT "smackfsdef="
	#define SMK_FSFLOOR "smackfsfloor="
	#define SMK_FSHAT "smackfshat="
	#define SMK_FSROOT "smackfsroot="
	#define SMK_FSTRANS "smackfstransmute="

	#define SMACK_DELETE_OPTION "-DELETE"
	#define SMACK_CIPSO_OPTION "-CIPSO"

	/*
	* How communications on this socket are treated.
	* Usually it's determined by the underlying netlabel code
	* but there are certain cases, including single label hosts
	* and potentially single label interfaces for which the
	* treatment can not be known in advance.
	*
	* The possibility of additional labeling schemes being
	* introduced in the future exists as well.
	*/
	#define SMACK_UNLABELED_SOCKET 0
	#define SMACK_CIPSO_SOCKET 1

	/*
	* CIPSO defaults.
	*/
	#define SMACK_CIPSO_DOI_DEFAULT 3 /* Historical */
	#define SMACK_CIPSO_DOI_INVALID -1 /* Not a DOI */
	#define SMACK_CIPSO_DIRECT_DEFAULT 250 /* Arbitrary */
	#define SMACK_CIPSO_MAPPED_DEFAULT 251 /* Also arbitrary */
	#define SMACK_CIPSO_MAXLEVEL 255 /* CIPSO 2.2 standard */
	/*
	* CIPSO 2.2 standard is 239, but Smack wants to use the
	* categories in a structured way that limits the value to
	* the bits in 23 bytes, hence the unusual number.
	*/
	#define SMACK_CIPSO_MAXCATNUM 184 /* 23 * 8 */

	/*
	* Ptrace rules
	*/
	#define SMACK_PTRACE_DEFAULT 0
	#define SMACK_PTRACE_EXACT 1
	#define SMACK_PTRACE_DRACONIAN 2
	#define SMACK_PTRACE_MAX SMACK_PTRACE_DRACONIAN

	/*
	* Flags for untraditional access modes.
	* It shouldn't be necessary to avoid conflicts with definitions
	* in fs.h, but do so anyway.
	*/
	#define MAY_TRANSMUTE 0x00001000 /* Controls directory labeling */
	#define MAY_LOCK 0x00002000 /* Locks should be writes, but ... */
	#define MAY_BRINGUP 0x00004000 /* Report use of this rule */

	#define SMACK_BRINGUP_ALLOW 1 /* Allow bringup mode */
	#define SMACK_UNCONFINED_SUBJECT 2 /* Allow unconfined label */
	#define SMACK_UNCONFINED_OBJECT 3 /* Allow unconfined label */

	/*
	* Just to make the common cases easier to deal with
	*/
	#define MAY_ANYREAD (MAY_READ \| MAY_EXEC)
	#define MAY_READWRITE (MAY_READ \| MAY_WRITE)
	#define MAY_NOT 0

	/*
	* Number of access types used by Smack (rwxatlb)
	*/
	#define SMK_NUM_ACCESS_TYPE 7

	/* SMACK data */
	struct smack_audit_data {
	const char *function;
	char *subject;
	char *object;
	char *request;
	int result;
	};

	/*
	* Smack audit data; is empty if CONFIG_AUDIT not set
	* to save some stack
	*/
	struct smk_audit_info {
	#ifdef CONFIG_AUDIT
	struct common_audit_data a;
	struct smack_audit_data sad;
	#endif
	};

	/*
	* These functions are in smack_access.c
	*/
	int smk_access_entry(char , char , struct list_head *);
	int smk_access(struct smack_known , struct smack_known ,
	int, struct smk_audit_info *);
	int smk_tskacc(struct task_smack , struct smack_known ,
	u32, struct smk_audit_info *);
	int smk_curacc(struct smack_known , u32, struct smk_audit_info );
	struct smack_known *smack_from_secid(const u32);
	char smk_parse_smack(const char string, int len);
	int smk_netlbl_mls(int, char , struct netlbl_lsm_secattr , int);
	struct smack_known smk_import_entry(const char , int);
	void smk_insert_entry(struct smack_known *skp);
	struct smack_known smk_find_entry(const char );
	int smack_privileged(int cap);

	/*
	* Shared data.
	*/
	extern int smack_enabled;
	extern int smack_cipso_direct;
	extern int smack_cipso_mapped;
	extern struct smack_known *smack_net_ambient;
	extern struct smack_known *smack_syslog_label;
	#ifdef CONFIG_SECURITY_SMACK_BRINGUP
	extern struct smack_known *smack_unconfined;
	#endif
	extern int smack_ptrace_rule;

	extern struct smack_known smack_known_floor;
	extern struct smack_known smack_known_hat;
	extern struct smack_known smack_known_huh;
	extern struct smack_known smack_known_invalid;
	extern struct smack_known smack_known_star;
	extern struct smack_known smack_known_web;

	extern struct mutex smack_known_lock;
	extern struct list_head smack_known_list;
	extern struct list_head smk_net4addr_list;
	#if IS_ENABLED(CONFIG_IPV6)
	extern struct list_head smk_net6addr_list;
	#endif /* CONFIG_IPV6 */

	extern struct mutex smack_onlycap_lock;
	extern struct list_head smack_onlycap_list;

	#define SMACK_HASH_SLOTS 16
	extern struct hlist_head smack_known_hash[SMACK_HASH_SLOTS];

	/*
	* Is the directory transmuting?
	*/
	static inline int smk_inode_transmutable(const struct inode *isp)
	{
	struct inode_smack *sip = isp->i_security;
	return (sip->smk_flags & SMK_INODE_TRANSMUTE) != 0;
	}

	/*
	* Present a pointer to the smack label entry in an inode blob.
	*/
	static inline struct smack_known smk_of_inode(const struct inode isp)
	{
	struct inode_smack *sip = isp->i_security;
	return sip->smk_inode;
	}

	/*
	* Present a pointer to the smack label entry in an task blob.
	*/
	static inline struct smack_known smk_of_task(const struct task_smack tsp)
	{
	return tsp->smk_task;
	}

	static inline struct smack_known smk_of_task_struct(const struct task_struct t)
	{
	struct smack_known *skp;

	rcu_read_lock();
	skp = smk_of_task(__task_cred(t)->security);
	rcu_read_unlock();
	return skp;
	}

	/*
	* Present a pointer to the forked smack label entry in an task blob.
	*/
	static inline struct smack_known smk_of_forked(const struct task_smack tsp)
	{
	return tsp->smk_forked;
	}

	/*
	* Present a pointer to the smack label in the current task blob.
	*/
	static inline struct smack_known *smk_of_current(void)
	{
	return smk_of_task(current_security());
	}

	/*
	* logging functions
	*/
	#define SMACK_AUDIT_DENIED 0x1
	#define SMACK_AUDIT_ACCEPT 0x2
	extern int log_policy;

	void smack_log(char subject_label, char object_label,
	int request,
	int result, struct smk_audit_info *auditdata);

	#ifdef CONFIG_AUDIT

	/*
	* some inline functions to set up audit data
	* they do nothing if CONFIG_AUDIT is not set
	*
	*/
	static inline void smk_ad_init(struct smk_audit_info a, const char func,
	char type)
	{
	memset(&a->sad, 0, sizeof(a->sad));
	a->a.type = type;
	a->a.smack_audit_data = &a->sad;
	a->a.smack_audit_data->function = func;
	}

	static inline void smk_ad_init_net(struct smk_audit_info a, const char func,
	char type, struct lsm_network_audit *net)
	{
	smk_ad_init(a, func, type);
	memset(net, 0, sizeof(*net));
	a->a.u.net = net;
	}

	static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
	struct task_struct *t)
	{
	a->a.u.tsk = t;
	}
	static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
	struct dentry *d)
	{
	a->a.u.dentry = d;
	}
	static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
	struct inode *i)
	{
	a->a.u.inode = i;
	}
	static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
	struct path p)
	{
	a->a.u.path = p;
	}
	static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
	struct sock *sk)
	{
	a->a.u.net->sk = sk;
	}

	#else /* no AUDIT */

	static inline void smk_ad_init(struct smk_audit_info a, const char func,
	char type)
	{
	}
	static inline void smk_ad_setfield_u_tsk(struct smk_audit_info *a,
	struct task_struct *t)
	{
	}
	static inline void smk_ad_setfield_u_fs_path_dentry(struct smk_audit_info *a,
	struct dentry *d)
	{
	}
	static inline void smk_ad_setfield_u_fs_path_mnt(struct smk_audit_info *a,
	struct vfsmount *m)
	{
	}
	static inline void smk_ad_setfield_u_fs_inode(struct smk_audit_info *a,
	struct inode *i)
	{
	}
	static inline void smk_ad_setfield_u_fs_path(struct smk_audit_info *a,
	struct path p)
	{
	}
	static inline void smk_ad_setfield_u_net_sk(struct smk_audit_info *a,
	struct sock *sk)
	{
	}
	#endif

	#endif /* _SECURITY_SMACK_H */