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cgdvar.h revision 1.17 
      1 /* $NetBSD: cgdvar.h,v 1.17 2014/03/18 15:44:37 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Roland C. Dowdeswell.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _DEV_CGDVAR_H_
     33 #define	_DEV_CGDVAR_H_
     34 
     35 /* ioctl(2) code: used by CGDIOCSET and CGDIOCCLR */
     36 struct cgd_ioctl {
     37 	const char	*ci_disk;
     38 	int		 ci_flags;
     39 	int		 ci_unit;
     40 	size_t		 ci_size;
     41 	const char	*ci_alg;
     42 	const char	*ci_ivmethod;
     43 	size_t		 ci_keylen;
     44 	const char	*ci_key;
     45 	size_t		 ci_blocksize;
     46 };
     47 
     48 /* ioctl(2) code: used by CGDIOCGET */
     49 struct cgd_user {
     50 	int		cgu_unit;	/* which cgd unit */
     51 	dev_t		cgu_dev;	/* target device */
     52 	char		cgu_alg[32];	/* algorithm name */
     53 	size_t		cgu_blocksize;	/* block size (in bytes) */
     54 	int		cgu_mode;	/* Cipher Mode and IV Gen method */
     55 #define CGD_CIPHER_CBC_ENCBLKNO8 1	/* CBC Mode w/ Enc Block Number
     56 					 * 8 passes (compat only)
     57 					 */
     58 #define CGD_CIPHER_CBC_ENCBLKNO1 2	/* CBC Mode w/ Enc Block Number
     59 					 * 1 pass (default)
     60 					 */
     61 	int		cgu_keylen;	/* keylength */
     62 };
     63 
     64 #ifdef _KERNEL
     65 
     66 #include <dev/cgd_crypto.h>
     67 
     68 /* This cryptdata structure is here rather than cgd_crypto.h, since
     69  * it stores local state which will not be generalised beyond the
     70  * cgd driver.
     71  */
     72 
     73 struct cryptdata {
     74 	size_t		 cf_blocksize;	/* block size (in bytes) */
     75 	int		 cf_keylen;	/* key length */
     76 	int		 cf_mode;	/* Cipher Mode and IV Gen method
     77 					 * (see cgu_mode above for defines) */
     78 	void		*cf_priv;	/* enc alg private data */
     79 };
     80 
     81 struct cgd_softc {
     82 	struct dk_softc		 sc_dksc;	/* generic disk interface */
     83 	struct vnode		*sc_tvn;	/* target device's vnode */
     84 	dev_t			 sc_tdev;	/* target device */
     85 	char			*sc_tpath;	/* target device's path */
     86 	void *			 sc_data;	/* emergency buffer */
     87 	int			 sc_data_used;	/* Really lame, we'll change */
     88 	size_t			 sc_tpathlen;	/* length of prior string */
     89 	struct cryptdata	 sc_cdata;	/* crypto data */
     90 	const struct cryptfuncs	*sc_cfuncs;	/* encryption functions */
     91 	kmutex_t		 sc_lock;	/* our lock */
     92 };
     93 #endif
     94 
     95 /* XXX XAX XXX elric:  check these out properly. */
     96 #define CGDIOCSET	_IOWR('F', 18, struct cgd_ioctl)
     97 #define CGDIOCCLR	_IOW('F', 19, struct cgd_ioctl)
     98 #define CGDIOCGET	_IOWR('F', 20, struct cgd_user)
     99 
    100 /* Maximum block sized to be used by the ciphers */
    101 #define CGD_MAXBLOCKSIZE	128
    102 
    103 #endif /* _DEV_CGDVAR_H_ */
    104