target/linux/generic/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@mcafee.com>
   5  * Copyright (C) 2006-2010 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 #include <linux/version.h>
  38 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED)
  39 #include <linux/config.h>
  40 #endif
  41 #include <linux/module.h>
  42 #include <linux/init.h>
  43 #include <linux/slab.h>
  44 #include <linux/uio.h>
  45 #include <linux/skbuff.h>
  46 #include <linux/kernel.h>
  47 #include <linux/mm.h>
  48 #include <asm/io.h>
  49
  50 #include <uio.h>
  51 #include <cryptodev.h>
  52
  53 /*
  54  * This macro is only for avoiding code duplication, as we need to skip
  55  * given number of bytes in the same way in three functions below.
  56  */
  57 #define CUIO_SKIP()     do {                                            \
  58         KASSERT(off >= 0, ("%s: off %d < 0", __func__, off));           \
  59         KASSERT(len >= 0, ("%s: len %d < 0", __func__, len));           \
  60         while (off > 0) {                                               \
  61                 KASSERT(iol >= 0, ("%s: empty in skip", __func__));     \
  62                 if (off < iov->iov_len)                                 \
  63                         break;                                          \
  64                 off -= iov->iov_len;                                    \
  65                 iol--;                                                  \
  66                 iov++;                                                  \
  67         }                                                               \
  68 } while (0)
  69
  70 void
  71 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
  72 {
  73         struct iovec *iov = uio->uio_iov;
  74         int iol = uio->uio_iovcnt;
  75         unsigned count;
  76
  77         CUIO_SKIP();
  78         while (len > 0) {
  79                 KASSERT(iol >= 0, ("%s: empty", __func__));
  80                 count = min((int)(iov->iov_len - off), len);
  81                 memcpy(cp, ((caddr_t)iov->iov_base) + off, count);
  82                 len -= count;
  83                 cp += count;
  84                 off = 0;
  85                 iol--;
  86                 iov++;
  87         }
  88 }
  89
  90 void
  91 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
  92 {
  93         struct iovec *iov = uio->uio_iov;
  94         int iol = uio->uio_iovcnt;
  95         unsigned count;
  96
  97         CUIO_SKIP();
  98         while (len > 0) {
  99                 KASSERT(iol >= 0, ("%s: empty", __func__));
 100                 count = min((int)(iov->iov_len - off), len);
 101                 memcpy(((caddr_t)iov->iov_base) + off, cp, count);
 102                 len -= count;
 103                 cp += count;
 104                 off = 0;
 105                 iol--;
 106                 iov++;
 107         }
 108 }
 109
 110 /*
 111  * Return a pointer to iov/offset of location in iovec list.
 112  */
 113 struct iovec *
 114 cuio_getptr(struct uio *uio, int loc, int *off)
 115 {
 116         struct iovec *iov = uio->uio_iov;
 117         int iol = uio->uio_iovcnt;
 118
 119         while (loc >= 0) {
 120                 /* Normal end of search */
 121                 if (loc < iov->iov_len) {
 122                         *off = loc;
 123                         return (iov);
 124                 }
 125
 126                 loc -= iov->iov_len;
 127                 if (iol == 0) {
 128                         if (loc == 0) {
 129                                 /* Point at the end of valid data */
 130                                 *off = iov->iov_len;
 131                                 return (iov);
 132                         } else
 133                                 return (NULL);
 134                 } else {
 135                         iov++, iol--;
 136                 }
 137         }
 138
 139         return (NULL);
 140 }
 141
 142 EXPORT_SYMBOL(cuio_copyback);
 143 EXPORT_SYMBOL(cuio_copydata);
 144 EXPORT_SYMBOL(cuio_getptr);
 145
 146
 147 static void
 148 skb_copy_bits_back(struct sk_buff *skb, int offset, caddr_t cp, int len)
 149 {
 150         int i;
 151         if (offset < skb_headlen(skb)) {
 152                 memcpy(skb->data + offset, cp, min_t(int, skb_headlen(skb), len));
 153                 len -= skb_headlen(skb);
 154                 cp += skb_headlen(skb);
 155         }
 156         offset -= skb_headlen(skb);
 157         for (i = 0; len > 0 && i < skb_shinfo(skb)->nr_frags; i++) {
 158                 if (offset < skb_shinfo(skb)->frags[i].size) {
 159                         memcpy(page_address(skb_frag_page(&skb_shinfo(skb)->frags[i])) +
 160                                         skb_shinfo(skb)->frags[i].page_offset,
 161                                         cp, min_t(int, skb_shinfo(skb)->frags[i].size, len));
 162                         len -= skb_shinfo(skb)->frags[i].size;
 163                         cp += skb_shinfo(skb)->frags[i].size;
 164                 }
 165                 offset -= skb_shinfo(skb)->frags[i].size;
 166         }
 167 }
 168
 169 void
 170 crypto_copyback(int flags, caddr_t buf, int off, int size, caddr_t in)
 171 {
 172
 173         if ((flags & CRYPTO_F_SKBUF) != 0)
 174                 skb_copy_bits_back((struct sk_buff *)buf, off, in, size);
 175         else if ((flags & CRYPTO_F_IOV) != 0)
 176                 cuio_copyback((struct uio *)buf, off, size, in);
 177         else
 178                 bcopy(in, buf + off, size);
 179 }
 180
 181 void
 182 crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
 183 {
 184
 185         if ((flags & CRYPTO_F_SKBUF) != 0)
 186                 skb_copy_bits((struct sk_buff *)buf, off, out, size);
 187         else if ((flags & CRYPTO_F_IOV) != 0)
 188                 cuio_copydata((struct uio *)buf, off, size, out);
 189         else
 190                 bcopy(buf + off, out, size);
 191 }
 192
 193 int
 194 crypto_apply(int flags, caddr_t buf, int off, int len,
 195     int (*f)(void *, void *, u_int), void *arg)
 196 {
 197 #if 0
 198         int error;
 199
 200         if ((flags & CRYPTO_F_SKBUF) != 0)
 201                 error = XXXXXX((struct mbuf *)buf, off, len, f, arg);
 202         else if ((flags & CRYPTO_F_IOV) != 0)
 203                 error = cuio_apply((struct uio *)buf, off, len, f, arg);
 204         else
 205                 error = (*f)(arg, buf + off, len);
 206         return (error);
 207 #else
 208         KASSERT(0, ("crypto_apply not implemented!\n"));
 209 #endif
 210         return 0;
 211 }
 212
 213 EXPORT_SYMBOL(crypto_copyback);
 214 EXPORT_SYMBOL(crypto_copydata);
 215 EXPORT_SYMBOL(crypto_apply);
 216