target/linux/generic-2.6/files/crypto/ocf/criov.c

   1 /*      $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
   2
   3 /*
   4  * Linux port done by David McCullough <david_mccullough@securecomputing.com>
   5  * Copyright (C) 2006-2007 David McCullough
   6  * Copyright (C) 2004-2005 Intel Corporation.
   7  * The license and original author are listed below.
   8  *
   9  * Copyright (c) 1999 Theo de Raadt
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *   notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *   notice, this list of conditions and the following disclaimer in the
  19  *   documentation and/or other materials provided with the distribution.
  20  * 3. The name of the author may not be used to endorse or promote products
  21  *   derived from this software without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34 __FBSDID("$FreeBSD: src/sys/opencrypto/criov.c,v 1.5 2006/06/04 22:15:13 pjd Exp $");
  35  */
  36
  37 #ifndef AUTOCONF_INCLUDED
  38 #include <linux/config.h>
  39 #endif
  40 #include <linux/module.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/uio.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/kernel.h>
  46 #include <linux/mm.h>
  47 #include <asm/io.h>
  48
  49 #include <uio.h>
  50 #include <cryptodev.h>
  51
  52 /*
  53  * This macro is only for avoiding code duplication, as we need to skip
  54  * given number of bytes in the same way in three functions below.
  55  */
  56 #define CUIO_SKIP()     do {                                            \
  57         KASSERT(off >= 0, ("%s: off %d < 0", __func__, off));           \
  58         KASSERT(len >= 0, ("%s: len %d < 0", __func__, len));           \
  59         while (off > 0) {                                               \
  60                 KASSERT(iol >= 0, ("%s: empty in skip", __func__));     \
  61                 if (off < iov->iov_len)                                 \
  62                         break;                                          \
  63                 off -= iov->iov_len;                                    \
  64                 iol--;                                                  \
  65                 iov++;                                                  \
  66         }                                                               \
  67 } while (0)
  68
  69 void
  70 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
  71 {
  72         struct iovec *iov = uio->uio_iov;
  73         int iol = uio->uio_iovcnt;
  74         unsigned count;
  75
  76         CUIO_SKIP();
  77         while (len > 0) {
  78                 KASSERT(iol >= 0, ("%s: empty", __func__));
  79                 count = min((int)(iov->iov_len - off), len);
  80                 memcpy(cp, ((caddr_t)iov->iov_base) + off, count);
  81                 len -= count;
  82                 cp += count;
  83                 off = 0;
  84                 iol--;
  85                 iov++;
  86         }
  87 }
  88
  89 void
  90 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
  91 {
  92         struct iovec *iov = uio->uio_iov;
  93         int iol = uio->uio_iovcnt;
  94         unsigned count;
  95
  96         CUIO_SKIP();
  97         while (len > 0) {
  98                 KASSERT(iol >= 0, ("%s: empty", __func__));
  99                 count = min((int)(iov->iov_len - off), len);
 100                 memcpy(((caddr_t)iov->iov_base) + off, cp, count);
 101                 len -= count;
 102                 cp += count;
 103                 off = 0;
 104                 iol--;
 105                 iov++;
 106         }
 107 }
 108
 109 /*
 110  * Return a pointer to iov/offset of location in iovec list.
 111  */
 112 struct iovec *
 113 cuio_getptr(struct uio *uio, int loc, int *off)
 114 {
 115         struct iovec *iov = uio->uio_iov;
 116         int iol = uio->uio_iovcnt;
 117
 118         while (loc >= 0) {
 119                 /* Normal end of search */
 120                 if (loc < iov->iov_len) {
 121                         *off = loc;
 122                         return (iov);
 123                 }
 124
 125                 loc -= iov->iov_len;
 126                 if (iol == 0) {
 127                         if (loc == 0) {
 128                                 /* Point at the end of valid data */
 129                                 *off = iov->iov_len;
 130                                 return (iov);
 131                         } else
 132                                 return (NULL);
 133                 } else {
 134                         iov++, iol--;
 135                 }
 136         }
 137
 138         return (NULL);
 139 }
 140
 141 EXPORT_SYMBOL(cuio_copyback);
 142 EXPORT_SYMBOL(cuio_copydata);
 143 EXPORT_SYMBOL(cuio_getptr);
 144
 145
 146 static void
 147 skb_copy_bits_back(struct sk_buff *skb, int offset, caddr_t cp, int len)
 148 {
 149         int i;
 150         if (offset < skb_headlen(skb)) {
 151                 memcpy(skb->data + offset, cp, min_t(int, skb_headlen(skb), len));
 152                 len -= skb_headlen(skb);
 153                 cp += skb_headlen(skb);
 154         }
 155         offset -= skb_headlen(skb);
 156         for (i = 0; len > 0 && i < skb_shinfo(skb)->nr_frags; i++) {
 157                 if (offset < skb_shinfo(skb)->frags[i].size) {
 158                         memcpy(page_address(skb_shinfo(skb)->frags[i].page) +
 159                                         skb_shinfo(skb)->frags[i].page_offset,
 160                                         cp, min_t(int, skb_shinfo(skb)->frags[i].size, len));
 161                         len -= skb_shinfo(skb)->frags[i].size;
 162                         cp += skb_shinfo(skb)->frags[i].size;
 163                 }
 164                 offset -= skb_shinfo(skb)->frags[i].size;
 165         }
 166 }
 167
 168 void
 169 crypto_copyback(int flags, caddr_t buf, int off, int size, caddr_t in)
 170 {
 171
 172         if ((flags & CRYPTO_F_SKBUF) != 0)
 173                 skb_copy_bits_back((struct sk_buff *)buf, off, in, size);
 174         else if ((flags & CRYPTO_F_IOV) != 0)
 175                 cuio_copyback((struct uio *)buf, off, size, in);
 176         else
 177                 bcopy(in, buf + off, size);
 178 }
 179
 180 void
 181 crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
 182 {
 183
 184         if ((flags & CRYPTO_F_SKBUF) != 0)
 185                 skb_copy_bits((struct sk_buff *)buf, off, out, size);
 186         else if ((flags & CRYPTO_F_IOV) != 0)
 187                 cuio_copydata((struct uio *)buf, off, size, out);
 188         else
 189                 bcopy(buf + off, out, size);
 190 }
 191
 192 int
 193 crypto_apply(int flags, caddr_t buf, int off, int len,
 194     int (*f)(void *, void *, u_int), void *arg)
 195 {
 196 #if 0
 197         int error;
 198
 199         if ((flags & CRYPTO_F_SKBUF) != 0)
 200                 error = XXXXXX((struct mbuf *)buf, off, len, f, arg);
 201         else if ((flags & CRYPTO_F_IOV) != 0)
 202                 error = cuio_apply((struct uio *)buf, off, len, f, arg);
 203         else
 204                 error = (*f)(arg, buf + off, len);
 205         return (error);
 206 #else
 207         KASSERT(0, ("crypto_apply not implemented!\n"));
 208 #endif
 209         return 0;
 210 }
 211
 212 EXPORT_SYMBOL(crypto_copyback);
 213 EXPORT_SYMBOL(crypto_copydata);
 214 EXPORT_SYMBOL(crypto_apply);
 215