/*
   *   fs/cifs/cifsacl.h
   *
   *   Copyright (c) International Business Machines  Corp., 2007
   *   Author(s): Steve French (sfrench@us.ibm.com)
   *
   *   This library is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU Lesser General Public License as published
   *   by the Free Software Foundation; either version 2.1 of the License, or
   *   (at your option) any later version.
   *
   *   This library is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
   *   the GNU Lesser General Public License for more details.
   *
   *   You should have received a copy of the GNU Lesser General Public License
   *   along with this library; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #ifndef _CIFSACL_H
  #define _CIFSACL_H
  
  
  #define NUM_AUTHS (6)	/* number of authority fields */
  #define SID_MAX_SUB_AUTHORITIES (15) /* max number of sub authority fields */
  
  #define READ_BIT        0x4
  #define WRITE_BIT       0x2
  #define EXEC_BIT        0x1
  
  #define UBITSHIFT	6
  #define GBITSHIFT	3
  
  #define ACCESS_ALLOWED	0
  #define ACCESS_DENIED	1
  
  #define SIDOWNER 1
  #define SIDGROUP 2
  
  /*
   * Security Descriptor length containing DACL with 3 ACEs (one each for
   * owner, group and world).
   */
  #define DEFAULT_SEC_DESC_LEN (sizeof(struct cifs_ntsd) + \
  			      sizeof(struct cifs_acl) + \
  			      (sizeof(struct cifs_ace) * 3))
  
  /*
   * Maximum size of a string representation of a SID:
   *
   * The fields are unsigned values in decimal. So:
   *
   * u8:  max 3 bytes in decimal
   * u32: max 10 bytes in decimal
   *
   * "S-" + 3 bytes for version field + 15 for authority field + NULL terminator
   *
   * For authority field, max is when all 6 values are non-zero and it must be
   * represented in hex. So "-0x" + 12 hex digits.
   *
   * Add 11 bytes for each subauthority field (10 bytes each + 1 for '-')
   */
  #define SID_STRING_BASE_SIZE (2 + 3 + 15 + 1)
  #define SID_STRING_SUBAUTH_SIZE (11) /* size of a single subauth string */
  
  struct cifs_ntsd {
  	__le16 revision; /* revision level */
  	__le16 type;
  	__le32 osidoffset;
  	__le32 gsidoffset;
  	__le32 sacloffset;
  	__le32 dacloffset;
  } __attribute__((packed));
  
  struct cifs_sid {
  	__u8 revision; /* revision level */
  	__u8 num_subauth;
  	__u8 authority[NUM_AUTHS];
  	__le32 sub_auth[SID_MAX_SUB_AUTHORITIES]; /* sub_auth[num_subauth] */
  } __attribute__((packed));
  
  /* size of a struct cifs_sid, sans sub_auth array */
  #define CIFS_SID_BASE_SIZE (1 + 1 + NUM_AUTHS)
  
  struct cifs_acl {
  	__le16 revision; /* revision level */
  	__le16 size;
  	__le32 num_aces;
  } __attribute__((packed));
  
  struct cifs_ace {
  	__u8 type;
  	__u8 flags;
  	__le16 size;
  	__le32 access_req;
  	struct cifs_sid sid; /* ie UUID of user or group who gets these perms */
  } __attribute__((packed));
  
  #endif /* _CIFSACL_H */