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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 |
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