1 /* $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
4 * Copyright (c) 1999 Theo de Raadt
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
36 #include <sys/errno.h>
37 #include <sys/malloc.h>
38 #include <sys/kernel.h>
41 #include <sys/limits.h>
44 #include <opencrypto/cryptodev.h>
47 * This macro is only for avoiding code duplication, as we need to skip
48 * given number of bytes in the same way in three functions below.
50 #define CUIO_SKIP() do { \
51 KASSERT(off >= 0, ("%s: off %d < 0", __func__, off)); \
52 KASSERT(len >= 0, ("%s: len %d < 0", __func__, len)); \
54 KASSERT(iol >= 0, ("%s: empty in skip", __func__)); \
55 if (off < iov->iov_len) \
57 off -= iov->iov_len; \
64 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
66 struct iovec *iov = uio->uio_iov;
67 int iol = uio->uio_iovcnt;
72 KASSERT(iol >= 0, ("%s: empty", __func__));
73 count = min(iov->iov_len - off, len);
74 bcopy(((caddr_t)iov->iov_base) + off, cp, count);
84 cuio_copyback(struct uio* uio, int off, int len, c_caddr_t cp)
86 struct iovec *iov = uio->uio_iov;
87 int iol = uio->uio_iovcnt;
92 KASSERT(iol >= 0, ("%s: empty", __func__));
93 count = min(iov->iov_len - off, len);
94 bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
104 * Return the index and offset of location in iovec list.
107 cuio_getptr(struct uio *uio, int loc, int *off)
112 while (loc >= 0 && ind < uio->uio_iovcnt) {
113 len = uio->uio_iov[ind].iov_len;
122 if (ind > 0 && loc == 0) {
124 *off = uio->uio_iov[ind].iov_len;
132 * Apply function f to the data in an iovec list starting "off" bytes from
133 * the beginning, continuing for "len" bytes.
136 cuio_apply(struct uio *uio, int off, int len, int (*f)(void *, void *, u_int),
139 struct iovec *iov = uio->uio_iov;
140 int iol = uio->uio_iovcnt;
146 KASSERT(iol >= 0, ("%s: empty", __func__));
147 count = min(iov->iov_len - off, len);
148 rval = (*f)(arg, ((caddr_t)iov->iov_base) + off, count);
160 crypto_copyback(struct cryptop *crp, int off, int size, const void *src)
163 switch (crp->crp_buf_type) {
164 case CRYPTO_BUF_MBUF:
165 m_copyback(crp->crp_mbuf, off, size, src);
168 cuio_copyback(crp->crp_uio, off, size, src);
170 case CRYPTO_BUF_CONTIG:
171 bcopy(src, crp->crp_buf + off, size);
174 panic("invalid crp buf type %d", crp->crp_buf_type);
179 crypto_copydata(struct cryptop *crp, int off, int size, void *dst)
182 switch (crp->crp_buf_type) {
183 case CRYPTO_BUF_MBUF:
184 m_copydata(crp->crp_mbuf, off, size, dst);
187 cuio_copydata(crp->crp_uio, off, size, dst);
189 case CRYPTO_BUF_CONTIG:
190 bcopy(crp->crp_buf + off, dst, size);
193 panic("invalid crp buf type %d", crp->crp_buf_type);
198 crypto_apply(struct cryptop *crp, int off, int len,
199 int (*f)(void *, void *, u_int), void *arg)
203 switch (crp->crp_buf_type) {
204 case CRYPTO_BUF_MBUF:
205 error = m_apply(crp->crp_mbuf, off, len, f, arg);
208 error = cuio_apply(crp->crp_uio, off, len, f, arg);
210 case CRYPTO_BUF_CONTIG:
211 error = (*f)(arg, crp->crp_buf + off, len);
214 panic("invalid crp buf type %d", crp->crp_buf_type);
220 crypto_mbuftoiov(struct mbuf *mbuf, struct iovec **iovptr, int *cnt,
224 struct mbuf *m, *mtmp;
236 /* we need to allocate a larger array */
239 while ((mtmp = mtmp->m_next) != NULL)
241 iov = malloc(sizeof *iov * (i + j), M_CRYPTO_DATA,
247 memcpy(iov, *iovptr, sizeof *iov * i);
250 iov[i].iov_base = m->m_data;
251 iov[i].iov_len = m->m_len;
258 KASSERT(*cnt == i, ("did not allocate correct amount: %d != %d",
267 m_contiguous_subsegment(struct mbuf *m, size_t skip, size_t len)
271 MPASS(skip <= INT_MAX);
273 m = m_getptr(m, (int)skip, &rel_off);
279 if (skip + len > m->m_len)
282 return (mtod(m, char*) + skip);
286 cuio_contiguous_segment(struct uio *uio, size_t skip, size_t len)
290 MPASS(skip <= INT_MAX);
291 idx = cuio_getptr(uio, (int)skip, &rel_off);
297 if (skip + len > uio->uio_iov[idx].iov_len)
299 return ((char *)uio->uio_iov[idx].iov_base + skip);
303 crypto_contiguous_subsegment(struct cryptop *crp, size_t skip, size_t len)
306 switch (crp->crp_buf_type) {
307 case CRYPTO_BUF_MBUF:
308 return (m_contiguous_subsegment(crp->crp_mbuf, skip, len));
310 return (cuio_contiguous_segment(crp->crp_uio, skip, len));
311 case CRYPTO_BUF_CONTIG:
312 return (crp->crp_buf + skip);
314 panic("invalid crp buf type %d", crp->crp_buf_type);