| 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 | |
| 216 | |
