criov.c

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    1 /*      $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1999 Theo de Raadt
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *   notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *   notice, this list of conditions and the following disclaimer in the
   14  *   documentation and/or other materials provided with the distribution.
   15  * 3. The name of the author may not be used to endorse or promote products
   16  *   derived from this software without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/6.2/sys/opencrypto/criov.c 161998 2006-09-04 15:16:14Z pjd $");
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/proc.h>
   36 #include <sys/errno.h>
   37 #include <sys/malloc.h>
   38 #include <sys/kernel.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/uio.h>
   41 
   42 #include <opencrypto/cryptodev.h>
   43 
   44 /*
   45  * This macro is only for avoiding code duplication, as we need to skip
   46  * given number of bytes in the same way in three functions below.
   47  */
   48 #define CUIO_SKIP()     do {                                            \
   49         KASSERT(off >= 0, ("%s: off %d < 0", __func__, off));           \
   50         KASSERT(len >= 0, ("%s: len %d < 0", __func__, len));           \
   51         while (off > 0) {                                               \
   52                 KASSERT(iol >= 0, ("%s: empty in skip", __func__));     \
   53                 if (off < iov->iov_len)                                 \
   54                         break;                                          \
   55                 off -= iov->iov_len;                                    \
   56                 iol--;                                                  \
   57                 iov++;                                                  \
   58         }                                                               \
   59 } while (0)
   60 
   61 void
   62 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
   63 {
   64         struct iovec *iov = uio->uio_iov;
   65         int iol = uio->uio_iovcnt;
   66         unsigned count;
   67 
   68         CUIO_SKIP();
   69         while (len > 0) {
   70                 KASSERT(iol >= 0, ("%s: empty", __func__));
   71                 count = min(iov->iov_len - off, len);
   72                 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
   73                 len -= count;
   74                 cp += count;
   75                 off = 0;
   76                 iol--;
   77                 iov++;
   78         }
   79 }
   80 
   81 void
   82 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
   83 {
   84         struct iovec *iov = uio->uio_iov;
   85         int iol = uio->uio_iovcnt;
   86         unsigned count;
   87 
   88         CUIO_SKIP();
   89         while (len > 0) {
   90                 KASSERT(iol >= 0, ("%s: empty", __func__));
   91                 count = min(iov->iov_len - off, len);
   92                 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
   93                 len -= count;
   94                 cp += count;
   95                 off = 0;
   96                 iol--;
   97                 iov++;
   98         }
   99 }
  100 
  101 /*
  102  * Return a pointer to iov/offset of location in iovec list.
  103  */
  104 struct iovec *
  105 cuio_getptr(struct uio *uio, int loc, int *off)
  106 {
  107         struct iovec *iov = uio->uio_iov;
  108         int iol = uio->uio_iovcnt;
  109 
  110         while (loc >= 0) {
  111                 /* Normal end of search */
  112                 if (loc < iov->iov_len) {
  113                         *off = loc;
  114                         return (iov);
  115                 }
  116 
  117                 loc -= iov->iov_len;
  118                 if (iol == 0) {
  119                         if (loc == 0) {
  120                                 /* Point at the end of valid data */
  121                                 *off = iov->iov_len;
  122                                 return (iov);
  123                         } else
  124                                 return (NULL);
  125                 } else {
  126                         iov++, iol--;
  127                 }
  128         }
  129 
  130         return (NULL);
  131 }
  132 
  133 /*
  134  * Apply function f to the data in an iovec list starting "off" bytes from
  135  * the beginning, continuing for "len" bytes.
  136  */
  137 int
  138 cuio_apply(struct uio *uio, int off, int len, int (*f)(void *, void *, u_int),
  139     void *arg)
  140 {
  141         struct iovec *iov = uio->uio_iov;
  142         int iol = uio->uio_iovcnt;
  143         unsigned count;
  144         int rval;
  145 
  146         CUIO_SKIP();
  147         while (len > 0) {
  148                 KASSERT(iol >= 0, ("%s: empty", __func__));
  149                 count = min(iov->iov_len - off, len);
  150                 rval = (*f)(arg, ((caddr_t)iov->iov_base) + off, count);
  151                 if (rval)
  152                         return (rval);
  153                 len -= count;
  154                 off = 0;
  155                 iol--;
  156                 iov++;
  157         }
  158         return (0);
  159 }
  160 
  161 void
  162 crypto_copyback(int flags, caddr_t buf, int off, int size, caddr_t in)
  163 {
  164 
  165         if ((flags & CRYPTO_F_IMBUF) != 0)
  166                 m_copyback((struct mbuf *)buf, off, size, in);
  167         else if ((flags & CRYPTO_F_IOV) != 0)
  168                 cuio_copyback((struct uio *)buf, off, size, in);
  169         else
  170                 bcopy(in, buf + off, size);
  171 }
  172 
  173 void
  174 crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
  175 {
  176 
  177         if ((flags & CRYPTO_F_IMBUF) != 0)
  178                 m_copydata((struct mbuf *)buf, off, size, out);
  179         else if ((flags & CRYPTO_F_IOV) != 0)
  180                 cuio_copydata((struct uio *)buf, off, size, out);
  181         else
  182                 bcopy(buf + off, out, size);
  183 }
  184 
  185 int
  186 crypto_apply(int flags, caddr_t buf, int off, int len,
  187     int (*f)(void *, void *, u_int), void *arg)
  188 {
  189         int error;
  190 
  191         if ((flags & CRYPTO_F_IMBUF) != 0)
  192                 error = m_apply((struct mbuf *)buf, off, len, f, arg);
  193         else if ((flags & CRYPTO_F_IOV) != 0)
  194                 error = cuio_apply((struct uio *)buf, off, len, f, arg);
  195         else
  196                 error = (*f)(arg, buf + off, len);
  197         return (error);
  198 }

Cache object: 29917631159c86515cc3cfbdaa59f39f

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

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