The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/cgdvar.h

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    1 /* $NetBSD: cgdvar.h,v 1.21 2020/06/13 22:15:58 riastradh 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 #include <sys/ioccom.h>
   36 
   37 /* ioctl(2) code: used by CGDIOCSET and CGDIOCCLR */
   38 struct cgd_ioctl {
   39         const char      *ci_disk;
   40         int              ci_flags;
   41         int              ci_unit;
   42         size_t           ci_size;
   43         const char      *ci_alg;
   44         const char      *ci_ivmethod;
   45         size_t           ci_keylen;
   46         const char      *ci_key;
   47         size_t           ci_blocksize;
   48 };
   49 
   50 /* ioctl(2) code: used by CGDIOCGET */
   51 struct cgd_user {
   52         int             cgu_unit;       /* which cgd unit */
   53         dev_t           cgu_dev;        /* target device */
   54         char            cgu_alg[32];    /* algorithm name */
   55         size_t          cgu_blocksize;  /* block size (in bytes) */
   56         int             cgu_mode;       /* Cipher Mode and IV Gen method */
   57 #define CGD_CIPHER_CBC_ENCBLKNO8 1      /* CBC Mode w/ Enc Block Number
   58                                          * 8 passes (compat only)
   59                                          */
   60 #define CGD_CIPHER_CBC_ENCBLKNO1 2      /* CBC Mode w/ Enc Block Number
   61                                          * 1 pass (default)
   62                                          */
   63         int             cgu_keylen;     /* keylength */
   64 };
   65 
   66 #ifdef _KERNEL
   67 
   68 #include <dev/cgd_crypto.h>
   69 #include <dev/dkvar.h>
   70 
   71 /* This cryptdata structure is here rather than cgd_crypto.h, since
   72  * it stores local state which will not be generalised beyond the
   73  * cgd driver.
   74  */
   75 
   76 struct cryptdata {
   77         size_t           cf_blocksize;  /* block size (in bytes) */
   78         int              cf_keylen;     /* key length */
   79         int              cf_mode;       /* Cipher Mode and IV Gen method
   80                                          * (see cgu_mode above for defines) */
   81         void            *cf_priv;       /* enc alg private data */
   82 };
   83 
   84 struct cgd_xfer {
   85         struct work              cx_work;
   86         struct cgd_softc        *cx_sc;
   87         struct buf              *cx_obp;
   88         struct buf              *cx_nbp;
   89         void                    *cx_dstv;
   90         const void              *cx_srcv;
   91         size_t                   cx_len;
   92         daddr_t                  cx_blkno;
   93         size_t                   cx_secsize;
   94         int                      cx_dir;
   95 };
   96 
   97 struct cgd_worker {
   98         struct workqueue        *cw_wq;         /* work queue */
   99         struct pool             *cw_cpool;      /* cgd_xfer contexts */
  100         u_int                    cw_busy;       /* number of busy contexts */
  101         u_int                    cw_last;       /* index of last CPU used */
  102         kmutex_t                 cw_lock;
  103 };
  104 
  105 struct cgd_softc {
  106         struct dk_softc          sc_dksc;       /* generic disk interface */
  107         struct vnode            *sc_tvn;        /* target device's vnode */
  108         dev_t                    sc_tdev;       /* target device */
  109         char                    *sc_tpath;      /* target device's path */
  110         void                    *sc_data;       /* emergency buffer */
  111         bool                     sc_data_used;  /* Really lame, we'll change */
  112         size_t                   sc_tpathlen;   /* length of prior string */
  113         struct cryptdata         sc_cdata;      /* crypto data */
  114         const struct cryptfuncs *sc_cfuncs;     /* encryption functions */
  115         kmutex_t                 sc_lock;
  116         kcondvar_t               sc_cv;
  117         bool                     sc_busy;
  118         struct cgd_worker       *sc_worker;     /* shared worker data */
  119 };
  120 #endif
  121 
  122 /* XXX XAX XXX elric:  check these out properly. */
  123 #define CGDIOCSET       _IOWR('F', 18, struct cgd_ioctl)
  124 #define CGDIOCCLR       _IOW('F', 19, struct cgd_ioctl)
  125 #define CGDIOCGET       _IOWR('F', 20, struct cgd_user)
  126 
  127 /* Maximum block sized to be used by the ciphers */
  128 #define CGD_MAXBLOCKSIZE        128
  129 
  130 #endif /* _DEV_CGDVAR_H_ */

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