kernel: linux/version.h was removed in kernel 2.6.19 and is now replaced by generated...
[openwrt/svn-archive/archive.git] / 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(2,6,33))
39 #include <generated/autoconf.h>
40 #else
41 #include <linux/autoconf.h>
42 #endif
43 #include <linux/module.h>
44 #include <linux/init.h>
45 #include <linux/slab.h>
46 #include <linux/uio.h>
47 #include <linux/skbuff.h>
48 #include <linux/kernel.h>
49 #include <linux/mm.h>
50 #include <asm/io.h>
51
52 #include <uio.h>
53 #include <cryptodev.h>
54
55 /*
56 * This macro is only for avoiding code duplication, as we need to skip
57 * given number of bytes in the same way in three functions below.
58 */
59 #define CUIO_SKIP() do { \
60 KASSERT(off >= 0, ("%s: off %d < 0", __func__, off)); \
61 KASSERT(len >= 0, ("%s: len %d < 0", __func__, len)); \
62 while (off > 0) { \
63 KASSERT(iol >= 0, ("%s: empty in skip", __func__)); \
64 if (off < iov->iov_len) \
65 break; \
66 off -= iov->iov_len; \
67 iol--; \
68 iov++; \
69 } \
70 } while (0)
71
72 void
73 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
74 {
75 struct iovec *iov = uio->uio_iov;
76 int iol = uio->uio_iovcnt;
77 unsigned count;
78
79 CUIO_SKIP();
80 while (len > 0) {
81 KASSERT(iol >= 0, ("%s: empty", __func__));
82 count = min((int)(iov->iov_len - off), len);
83 memcpy(cp, ((caddr_t)iov->iov_base) + off, count);
84 len -= count;
85 cp += count;
86 off = 0;
87 iol--;
88 iov++;
89 }
90 }
91
92 void
93 cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
94 {
95 struct iovec *iov = uio->uio_iov;
96 int iol = uio->uio_iovcnt;
97 unsigned count;
98
99 CUIO_SKIP();
100 while (len > 0) {
101 KASSERT(iol >= 0, ("%s: empty", __func__));
102 count = min((int)(iov->iov_len - off), len);
103 memcpy(((caddr_t)iov->iov_base) + off, cp, count);
104 len -= count;
105 cp += count;
106 off = 0;
107 iol--;
108 iov++;
109 }
110 }
111
112 /*
113 * Return a pointer to iov/offset of location in iovec list.
114 */
115 struct iovec *
116 cuio_getptr(struct uio *uio, int loc, int *off)
117 {
118 struct iovec *iov = uio->uio_iov;
119 int iol = uio->uio_iovcnt;
120
121 while (loc >= 0) {
122 /* Normal end of search */
123 if (loc < iov->iov_len) {
124 *off = loc;
125 return (iov);
126 }
127
128 loc -= iov->iov_len;
129 if (iol == 0) {
130 if (loc == 0) {
131 /* Point at the end of valid data */
132 *off = iov->iov_len;
133 return (iov);
134 } else
135 return (NULL);
136 } else {
137 iov++, iol--;
138 }
139 }
140
141 return (NULL);
142 }
143
144 EXPORT_SYMBOL(cuio_copyback);
145 EXPORT_SYMBOL(cuio_copydata);
146 EXPORT_SYMBOL(cuio_getptr);
147
148
149 static void
150 skb_copy_bits_back(struct sk_buff *skb, int offset, caddr_t cp, int len)
151 {
152 int i;
153 if (offset < skb_headlen(skb)) {
154 memcpy(skb->data + offset, cp, min_t(int, skb_headlen(skb), len));
155 len -= skb_headlen(skb);
156 cp += skb_headlen(skb);
157 }
158 offset -= skb_headlen(skb);
159 for (i = 0; len > 0 && i < skb_shinfo(skb)->nr_frags; i++) {
160 if (offset < skb_shinfo(skb)->frags[i].size) {
161 memcpy(page_address(skb_shinfo(skb)->frags[i].page) +
162 skb_shinfo(skb)->frags[i].page_offset,
163 cp, min_t(int, skb_shinfo(skb)->frags[i].size, len));
164 len -= skb_shinfo(skb)->frags[i].size;
165 cp += skb_shinfo(skb)->frags[i].size;
166 }
167 offset -= skb_shinfo(skb)->frags[i].size;
168 }
169 }
170
171 void
172 crypto_copyback(int flags, caddr_t buf, int off, int size, caddr_t in)
173 {
174
175 if ((flags & CRYPTO_F_SKBUF) != 0)
176 skb_copy_bits_back((struct sk_buff *)buf, off, in, size);
177 else if ((flags & CRYPTO_F_IOV) != 0)
178 cuio_copyback((struct uio *)buf, off, size, in);
179 else
180 bcopy(in, buf + off, size);
181 }
182
183 void
184 crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
185 {
186
187 if ((flags & CRYPTO_F_SKBUF) != 0)
188 skb_copy_bits((struct sk_buff *)buf, off, out, size);
189 else if ((flags & CRYPTO_F_IOV) != 0)
190 cuio_copydata((struct uio *)buf, off, size, out);
191 else
192 bcopy(buf + off, out, size);
193 }
194
195 int
196 crypto_apply(int flags, caddr_t buf, int off, int len,
197 int (*f)(void *, void *, u_int), void *arg)
198 {
199 #if 0
200 int error;
201
202 if ((flags & CRYPTO_F_SKBUF) != 0)
203 error = XXXXXX((struct mbuf *)buf, off, len, f, arg);
204 else if ((flags & CRYPTO_F_IOV) != 0)
205 error = cuio_apply((struct uio *)buf, off, len, f, arg);
206 else
207 error = (*f)(arg, buf + off, len);
208 return (error);
209 #else
210 KASSERT(0, ("crypto_apply not implemented!\n"));
211 #endif
212 return 0;
213 }
214
215 EXPORT_SYMBOL(crypto_copyback);
216 EXPORT_SYMBOL(crypto_copydata);
217 EXPORT_SYMBOL(crypto_apply);
218