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 /*      $FreeBSD: src/sys/opencrypto/criov.c,v 1.5 2006/06/04 22:15:13 pjd Exp $        */
    2 /*      $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason 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/param.h>
   32 #include <sys/systm.h>
   33 #include <sys/proc.h>
   34 #include <sys/bus.h>
   35 #include <sys/errno.h>
   36 #include <sys/malloc.h>
   37 #include <sys/kernel.h>
   38 #include <sys/mbuf.h>
   39 #include <sys/uio.h>
   40 
   41 #include <opencrypto/cryptodev.h>
   42 
   43 /*
   44  * This macro is only for avoiding code duplication, as we need to skip
   45  * given number of bytes in the same way in three functions below.
   46  */
   47 #define CUIO_SKIP()     do {                                            \
   48         KASSERT(off >= 0, ("%s: off %d < 0", __func__, off));           \
   49         KASSERT(len >= 0, ("%s: len %d < 0", __func__, len));           \
   50         while (off > 0) {                                               \
   51                 KASSERT(iol >= 0, ("%s: empty in skip", __func__));     \
   52                 if (off < iov->iov_len)                                 \
   53                         break;                                          \
   54                 off -= iov->iov_len;                                    \
   55                 iol--;                                                  \
   56                 iov++;                                                  \
   57         }                                                               \
   58 } while (0)
   59 
   60 void
   61 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
   62 {
   63         struct iovec *iov = uio->uio_iov;
   64         int iol = uio->uio_iovcnt;
   65         unsigned count;
   66 
   67         CUIO_SKIP();
   68         while (len > 0) {
   69                 KASSERT(iol >= 0, ("%s: empty", __func__));
   70                 count = min(iov->iov_len - off, len);
   71                 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
   72                 len -= count;
   73                 cp += count;
   74                 off = 0;
   75                 iol--;
   76                 iov++;
   77         }
   78 }
   79 
   80 void
   81 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
   82 {
   83         struct iovec *iov = uio->uio_iov;
   84         int iol = uio->uio_iovcnt;
   85         unsigned count;
   86 
   87         CUIO_SKIP();
   88         while (len > 0) {
   89                 KASSERT(iol >= 0, ("%s: empty", __func__));
   90                 count = min(iov->iov_len - off, len);
   91                 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
   92                 len -= count;
   93                 cp += count;
   94                 off = 0;
   95                 iol--;
   96                 iov++;
   97         }
   98 }
   99 
  100 /*
  101  * Return a pointer to iov/offset of location in iovec list.
  102  */
  103 struct iovec *
  104 cuio_getptr(struct uio *uio, int loc, int *off)
  105 {
  106         struct iovec *iov = uio->uio_iov;
  107         int iol = uio->uio_iovcnt;
  108 
  109         while (loc >= 0) {
  110                 /* Normal end of search */
  111                 if (loc < iov->iov_len) {
  112                         *off = loc;
  113                         return (iov);
  114                 }
  115 
  116                 loc -= iov->iov_len;
  117                 if (iol == 0) {
  118                         if (loc == 0) {
  119                                 /* Point at the end of valid data */
  120                                 *off = iov->iov_len;
  121                                 return (iov);
  122                         } else
  123                                 return (NULL);
  124                 } else {
  125                         iov++, iol--;
  126                 }
  127         }
  128 
  129         return (NULL);
  130 }
  131 
  132 /*
  133  * Apply function f to the data in an iovec list starting "off" bytes from
  134  * the beginning, continuing for "len" bytes.
  135  */
  136 int
  137 cuio_apply(struct uio *uio, int off, int len, int (*f)(void *, void *, u_int),
  138     void *arg)
  139 {
  140         struct iovec *iov = uio->uio_iov;
  141         int iol = uio->uio_iovcnt;
  142         unsigned count;
  143         int rval;
  144 
  145         CUIO_SKIP();
  146         while (len > 0) {
  147                 KASSERT(iol >= 0, ("%s: empty", __func__));
  148                 count = min(iov->iov_len - off, len);
  149                 rval = (*f)(arg, ((caddr_t)iov->iov_base) + off, count);
  150                 if (rval)
  151                         return (rval);
  152                 len -= count;
  153                 off = 0;
  154                 iol--;
  155                 iov++;
  156         }
  157         return (0);
  158 }
  159 
  160 void
  161 crypto_copyback(int flags, caddr_t buf, int off, int size, caddr_t in)
  162 {
  163 
  164         if ((flags & CRYPTO_F_IMBUF) != 0)
  165                 m_copyback((struct mbuf *)buf, off, size, in);
  166         else if ((flags & CRYPTO_F_IOV) != 0)
  167                 cuio_copyback((struct uio *)buf, off, size, in);
  168         else
  169                 bcopy(in, buf + off, size);
  170 }
  171 
  172 void
  173 crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
  174 {
  175 
  176         if ((flags & CRYPTO_F_IMBUF) != 0)
  177                 m_copydata((struct mbuf *)buf, off, size, out);
  178         else if ((flags & CRYPTO_F_IOV) != 0)
  179                 cuio_copydata((struct uio *)buf, off, size, out);
  180         else
  181                 bcopy(buf + off, out, size);
  182 }
  183 
  184 int
  185 crypto_apply(int flags, caddr_t buf, int off, int len,
  186     int (*f)(void *, void *, u_int), void *arg)
  187 {
  188         int error;
  189 
  190         if ((flags & CRYPTO_F_IMBUF) != 0)
  191                 error = m_apply((struct mbuf *)buf, off, len, f, arg);
  192         else if ((flags & CRYPTO_F_IOV) != 0)
  193                 error = cuio_apply((struct uio *)buf, off, len, f, arg);
  194         else
  195                 error = (*f)(arg, buf + off, len);
  196         return (error);
  197 }

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