criov.c

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    1 /*      $NetBSD: criov.c,v 1.9 2018/09/03 16:29:37 riastradh Exp $ */
    2 /*      $OpenBSD: criov.c,v 1.11 2002/06/10 19:36:43 espie Exp $        */
    3 
    4 /*
    5  * Copyright (c) 1999 Theo de Raadt
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *   notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *   notice, this list of conditions and the following disclaimer in the
   15  *   documentation and/or other materials provided with the distribution.
   16  * 3. The name of the author may not be used to endorse or promote products
   17  *   derived from this software without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   24  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   28  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   29  */
   30 
   31 #include <sys/cdefs.h>
   32 __KERNEL_RCSID(0, "$NetBSD: criov.c,v 1.9 2018/09/03 16:29:37 riastradh Exp $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/proc.h>
   37 #include <sys/errno.h>
   38 #include <sys/malloc.h>
   39 #include <sys/kernel.h>
   40 #include <sys/mbuf.h>
   41 
   42 #include <uvm/uvm_extern.h>
   43 
   44 #include <opencrypto/cryptodev.h>
   45 int cuio_getindx(struct uio *uio, int loc, int *off);
   46 
   47 
   48 void
   49 cuio_copydata(struct uio *uio, int off, int len, void *cp)
   50 {
   51         struct iovec *iov = uio->uio_iov;
   52         int iol = uio->uio_iovcnt;
   53         unsigned count;
   54 
   55         if (off < 0)
   56                 panic("cuio_copydata: off %d < 0", off);
   57         if (len < 0)
   58                 panic("cuio_copydata: len %d < 0", len);
   59         while (off > 0) {
   60                 if (iol == 0)
   61                         panic("iov_copydata: empty in skip");
   62                 if (off < iov->iov_len)
   63                         break;
   64                 off -= iov->iov_len;
   65                 iol--;
   66                 iov++;
   67         }
   68         while (len > 0) {
   69                 if (iol == 0)
   70                         panic("cuio_copydata: empty");
   71                 count = uimin(iov->iov_len - off, len);
   72                 memcpy(cp, (char *)iov->iov_base + off, count);
   73                 len -= count;
   74                 cp = (char *)cp + count;
   75                 off = 0;
   76                 iol--;
   77                 iov++;
   78         }
   79 }
   80 
   81 void
   82 cuio_copyback(struct uio *uio, int off, int len, void *cp)
   83 {
   84         struct iovec *iov = uio->uio_iov;
   85         int iol = uio->uio_iovcnt;
   86         unsigned count;
   87 
   88         if (off < 0)
   89                 panic("cuio_copyback: off %d < 0", off);
   90         if (len < 0)
   91                 panic("cuio_copyback: len %d < 0", len);
   92         while (off > 0) {
   93                 if (iol == 0) {
   94 #ifdef DEBUG
   95                         printf("cuio_copyback: empty in skip\n");
   96 #endif
   97                         return;
   98                 }
   99                 if (off < iov->iov_len)
  100                         break;
  101                 off -= iov->iov_len;
  102                 iol--;
  103                 iov++;
  104         }
  105         while (len > 0) {
  106                 if (iol == 0) {
  107 #ifdef DEBUG
  108                         printf("uio_copyback: empty\n");
  109 #endif
  110                         return;
  111                 }
  112                 count = uimin(iov->iov_len - off, len);
  113                 memcpy((char *)iov->iov_base + off, cp, count);
  114                 len -= count;
  115                 cp = (char *)cp + count;
  116                 off = 0;
  117                 iol--;
  118                 iov++;
  119         }
  120 }
  121 
  122 /*
  123  * Return a pointer to iov/offset of location in iovec list.
  124  */
  125 
  126 int
  127 cuio_getptr(struct uio *uio, int loc, int *off)
  128 {
  129         int ind, len;
  130 
  131         ind = 0;
  132         while (loc >= 0 && ind < uio->uio_iovcnt) {
  133                 len = uio->uio_iov[ind].iov_len;
  134                 if (len > loc) {
  135                         *off = loc;
  136                         return (ind);
  137                 }
  138                 loc -= len;
  139                 ind++;
  140         }
  141 
  142         if (ind > 0 && loc == 0) {
  143                 ind--;
  144                 *off = uio->uio_iov[ind].iov_len;
  145                 return (ind);
  146         }
  147 
  148         return (-1);
  149 }
  150 
  151 int
  152 cuio_apply(struct uio *uio, int off, int len,
  153     int (*f)(void *, void *, unsigned int), void *fstate)
  154 {
  155         int rval, ind, uiolen;
  156         unsigned int count;
  157 
  158         if (len < 0)
  159                 panic("%s: len %d < 0", __func__, len);
  160         if (off < 0)
  161                 panic("%s: off %d < 0", __func__, off);
  162 
  163         ind = 0;
  164         while (off > 0) {
  165                 if (ind >= uio->uio_iovcnt)
  166                         panic("cuio_apply: out of ivecs before data in uio");
  167                 uiolen = uio->uio_iov[ind].iov_len;
  168                 if (off < uiolen)
  169                         break;
  170                 off -= uiolen;
  171                 ind++;
  172         }
  173         while (len > 0) {
  174                 if (ind >= uio->uio_iovcnt)
  175                         panic("cuio_apply: out of ivecs when processing uio");
  176                 count = uimin(uio->uio_iov[ind].iov_len - off, len);
  177 
  178                 rval = f(fstate,
  179                          ((char *)uio->uio_iov[ind].iov_base + off), count);
  180                 if (rval)
  181                         return (rval);
  182 
  183                 len -= count;
  184                 off = 0;
  185                 ind++;
  186         }
  187 
  188         return (0);
  189 }

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FreeBSD/Linux Kernel Cross Reference sys/opencrypto/criov.c

FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/criov.c