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/opencrypto/criov.c

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    1 /*      $NetBSD: criov.c,v 1.4 2005/12/11 12:25:20 christos 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 1.4 2005/12/11 12:25:20 christos 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(uio, off, len, cp)
   50         struct uio *uio;
   51         int off, len;
   52         caddr_t cp;
   53 {
   54         struct iovec *iov = uio->uio_iov;
   55         int iol = uio->uio_iovcnt;
   56         unsigned count;
   57 
   58         if (off < 0)
   59                 panic("cuio_copydata: off %d < 0", off);
   60         if (len < 0)
   61                 panic("cuio_copydata: len %d < 0", len);
   62         while (off > 0) {
   63                 if (iol == 0)
   64                         panic("iov_copydata: empty in skip");
   65                 if (off < iov->iov_len)
   66                         break;
   67                 off -= iov->iov_len;
   68                 iol--;
   69                 iov++;
   70         }
   71         while (len > 0) {
   72                 if (iol == 0)
   73                         panic("cuio_copydata: empty");
   74                 count = min(iov->iov_len - off, len);
   75                 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
   76                 len -= count;
   77                 cp += count;
   78                 off = 0;
   79                 iol--;
   80                 iov++;
   81         }
   82 }
   83 
   84 void
   85 cuio_copyback(uio, off, len, cp)
   86         struct uio *uio;
   87         int off, len;
   88         caddr_t cp;
   89 {
   90         struct iovec *iov = uio->uio_iov;
   91         int iol = uio->uio_iovcnt;
   92         unsigned count;
   93 
   94         if (off < 0)
   95                 panic("cuio_copyback: off %d < 0", off);
   96         if (len < 0)
   97                 panic("cuio_copyback: len %d < 0", len);
   98         while (off > 0) {
   99                 if (iol == 0)
  100                         panic("cuio_copyback: empty in skip");
  101                 if (off < iov->iov_len)
  102                         break;
  103                 off -= iov->iov_len;
  104                 iol--;
  105                 iov++;
  106         }
  107         while (len > 0) {
  108                 if (iol == 0)
  109                         panic("uio_copyback: empty");
  110                 count = min(iov->iov_len - off, len);
  111                 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
  112                 len -= count;
  113                 cp += count;
  114                 off = 0;
  115                 iol--;
  116                 iov++;
  117         }
  118 }
  119 
  120 /*
  121  * Return a pointer to iov/offset of location in iovec list.
  122  */
  123 #ifdef __FreeBSD__
  124 struct iovec *
  125 cuio_getptr(struct uio *uio, int loc, int *off)
  126 {
  127         struct iovec *iov = uio->uio_iov;
  128         int iol = uio->uio_iovcnt;
  129 
  130         while (loc >= 0) {
  131                 /* Normal end of search */
  132                 if (loc < iov->iov_len) {
  133                         *off = loc;
  134                         return (iov);
  135                 }
  136 
  137                 loc -= iov->iov_len;
  138                 if (iol == 0) {
  139                         if (loc == 0) {
  140                                 /* Point at the end of valid data */
  141                                 *off = iov->iov_len;
  142                                 return (iov);
  143                         } else
  144                                 return (NULL);
  145                 } else {
  146                         iov++, iol--;
  147                 }
  148         }
  149 
  150         return (NULL);
  151 }
  152 
  153 #else
  154 
  155 int
  156 cuio_getptr(struct uio *uio, int loc, int *off)
  157 {
  158         int ind, len;
  159 
  160         ind = 0;
  161         while (loc >= 0 && ind < uio->uio_iovcnt) {
  162                 len = uio->uio_iov[ind].iov_len;
  163                 if (len > loc) {
  164                         *off = loc;
  165                         return (ind);
  166                 }
  167                 loc -= len;
  168                 ind++;
  169         }
  170 
  171         if (ind > 0 && loc == 0) {
  172                 ind--;
  173                 *off = uio->uio_iov[ind].iov_len;
  174                 return (ind);
  175         }
  176 
  177         return (-1);
  178 }
  179 #endif
  180 
  181 int
  182 cuio_apply(struct uio *uio, int off, int len,
  183     int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate)
  184 {
  185         int rval, ind, uiolen;
  186         unsigned int count;
  187 
  188         if (len < 0)
  189                 panic("%s: len %d < 0", __func__, len);
  190         if (off < 0)
  191                 panic("%s: off %d < 0", __func__, off);
  192 
  193         ind = 0;
  194         while (off > 0) {
  195                 if (ind >= uio->uio_iovcnt)
  196                         panic("cuio_apply: out of ivecs before data in uio");
  197                 uiolen = uio->uio_iov[ind].iov_len;
  198                 if (off < uiolen)
  199                         break;
  200                 off -= uiolen;
  201                 ind++;
  202         }
  203         while (len > 0) {
  204                 if (ind >= uio->uio_iovcnt)
  205                         panic("cuio_apply: out of ivecs when processing uio");
  206                 count = min(uio->uio_iov[ind].iov_len - off, len);
  207 
  208                 rval = f(fstate,
  209                          ((caddr_t)uio->uio_iov[ind].iov_base + off), count);
  210                 if (rval)
  211                         return (rval);
  212 
  213                 len -= count;
  214                 off = 0;
  215                 ind++;
  216         }
  217 
  218         return (0);
  219 }

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