include/linux/selinux.h

   1 /*
   2  * SELinux services exported to the rest of the kernel.
   3  *
   4  * Author: James Morris <jmorris@redhat.com>
   5  *
   6  * Copyright (C) 2005 Red Hat, Inc., James Morris <jmorris@redhat.com>
   7  * Copyright (C) 2006 Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   8  * Copyright (C) 2006 IBM Corporation, Timothy R. Chavez <tinytim@us.ibm.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2,
  12  * as published by the Free Software Foundation.
  13  */
  14 #ifndef _LINUX_SELINUX_H
  15 #define _LINUX_SELINUX_H
  16
  17 struct selinux_audit_rule;
  18 struct audit_context;
  19 struct kern_ipc_perm;
  20
  21 #ifdef CONFIG_SECURITY_SELINUX
  22
  23 /**
  24  *     selinux_string_to_sid - map a security context string to a security ID
  25  *     @str: the security context string to be mapped
  26  *     @sid: ID value returned via this.
  27  *
  28  *     Returns 0 if successful, with the SID stored in sid.  A value
  29  *     of zero for sid indicates no SID could be determined (but no error
  30  *     occurred).
  31  */
  32 int selinux_string_to_sid(char *str, u32 *sid);
  33
  34 /**
  35  *     selinux_secmark_relabel_packet_permission - secmark permission check
  36  *     @sid: SECMARK ID value to be applied to network packet
  37  *
  38  *     Returns 0 if the current task is allowed to set the SECMARK label of
  39  *     packets with the supplied security ID.  Note that it is implicit that
  40  *     the packet is always being relabeled from the default unlabeled value,
  41  *     and that the access control decision is made in the AVC.
  42  */
  43 int selinux_secmark_relabel_packet_permission(u32 sid);
  44
  45 /**
  46  *     selinux_secmark_refcount_inc - increments the secmark use counter
  47  *
  48  *     SELinux keeps track of the current SECMARK targets in use so it knows
  49  *     when to apply SECMARK label access checks to network packets.  This
  50  *     function incements this reference count to indicate that a new SECMARK
  51  *     target has been configured.
  52  */
  53 void selinux_secmark_refcount_inc(void);
  54
  55 /**
  56  *     selinux_secmark_refcount_dec - decrements the secmark use counter
  57  *
  58  *     SELinux keeps track of the current SECMARK targets in use so it knows
  59  *     when to apply SECMARK label access checks to network packets.  This
  60  *     function decements this reference count to indicate that one of the
  61  *     existing SECMARK targets has been removed/flushed.
  62  */
  63 void selinux_secmark_refcount_dec(void);
  64
  65 /**
  66  * selinux_is_enabled - is SELinux enabled?
  67  */
  68 bool selinux_is_enabled(void);
  69 #else
  70
  71 static inline int selinux_string_to_sid(const char *str, u32 *sid)
  72 {
  73        *sid = 0;
  74        return 0;
  75 }
  76
  77 static inline int selinux_secmark_relabel_packet_permission(u32 sid)
  78 {
  79         return 0;
  80 }
  81
  82 static inline void selinux_secmark_refcount_inc(void)
  83 {
  84         return;
  85 }
  86
  87 static inline void selinux_secmark_refcount_dec(void)
  88 {
  89         return;
  90 }
  91
  92 static inline bool selinux_is_enabled(void)
  93 {
  94         return false;
  95 }
  96 #endif  /* CONFIG_SECURITY_SELINUX */
  97
  98 #endif /* _LINUX_SELINUX_H */