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/* $OpenBSD: criov.c,v 1.9 2002/01/29 15:48:29 jason Exp $ */
/*-
* Copyright (c) 1999 Theo de Raadt
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/uio.h>
#include <opencrypto/cryptodev.h>
/*
* This macro is only for avoiding code duplication, as we need to skip
* given number of bytes in the same way in three functions below.
*/
#define CUIO_SKIP() do { \
KASSERT(off >= 0, ("%s: off %d < 0", __func__, off)); \
KASSERT(len >= 0, ("%s: len %d < 0", __func__, len)); \
while (off > 0) { \
KASSERT(iol >= 0, ("%s: empty in skip", __func__)); \
if (off < iov->iov_len) \
break; \
off -= iov->iov_len; \
iol--; \
iov++; \
} \
} while (0)
void
cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
{
struct iovec *iov = uio->uio_iov;
int iol = uio->uio_iovcnt;
unsigned count;
CUIO_SKIP();
while (len > 0) {
KASSERT(iol >= 0, ("%s: empty", __func__));
count = min(iov->iov_len - off, len);
bcopy(((caddr_t)iov->iov_base) + off, cp, count);
len -= count;
cp += count;
off = 0;
iol--;
iov++;
}
}
void
cuio_copyback(struct uio* uio, int off, int len, c_caddr_t cp)
{
struct iovec *iov = uio->uio_iov;
int iol = uio->uio_iovcnt;
unsigned count;
CUIO_SKIP();
while (len > 0) {
KASSERT(iol >= 0, ("%s: empty", __func__));
count = min(iov->iov_len - off, len);
bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
len -= count;
cp += count;
off = 0;
iol--;
iov++;
}
}
/*
* Return the index and offset of location in iovec list.
*/
int
cuio_getptr(struct uio *uio, int loc, int *off)
{
int ind, len;
ind = 0;
while (loc >= 0 && ind < uio->uio_iovcnt) {
len = uio->uio_iov[ind].iov_len;
if (len > loc) {
*off = loc;
return (ind);
}
loc -= len;
ind++;
}
if (ind > 0 && loc == 0) {
ind--;
*off = uio->uio_iov[ind].iov_len;
return (ind);
}
return (-1);
}
/*
* Apply function f to the data in an iovec list starting "off" bytes from
* the beginning, continuing for "len" bytes.
*/
int
cuio_apply(struct uio *uio, int off, int len, int (*f)(void *, void *, u_int),
void *arg)
{
struct iovec *iov = uio->uio_iov;
int iol = uio->uio_iovcnt;
unsigned count;
int rval;
CUIO_SKIP();
while (len > 0) {
KASSERT(iol >= 0, ("%s: empty", __func__));
count = min(iov->iov_len - off, len);
rval = (*f)(arg, ((caddr_t)iov->iov_base) + off, count);
if (rval)
return (rval);
len -= count;
off = 0;
iol--;
iov++;
}
return (0);
}
void
crypto_copyback(int flags, caddr_t buf, int off, int size, c_caddr_t in)
{
if ((flags & CRYPTO_F_IMBUF) != 0)
m_copyback((struct mbuf *)buf, off, size, in);
else if ((flags & CRYPTO_F_IOV) != 0)
cuio_copyback((struct uio *)buf, off, size, in);
else
bcopy(in, buf + off, size);
}
void
crypto_copydata(int flags, caddr_t buf, int off, int size, caddr_t out)
{
if ((flags & CRYPTO_F_IMBUF) != 0)
m_copydata((struct mbuf *)buf, off, size, out);
else if ((flags & CRYPTO_F_IOV) != 0)
cuio_copydata((struct uio *)buf, off, size, out);
else
bcopy(buf + off, out, size);
}
int
crypto_apply(int flags, caddr_t buf, int off, int len,
int (*f)(void *, void *, u_int), void *arg)
{
int error;
if ((flags & CRYPTO_F_IMBUF) != 0)
error = m_apply((struct mbuf *)buf, off, len, f, arg);
else if ((flags & CRYPTO_F_IOV) != 0)
error = cuio_apply((struct uio *)buf, off, len, f, arg);
else
error = (*f)(arg, buf + off, len);
return (error);
}
int
crypto_mbuftoiov(struct mbuf *mbuf, struct iovec **iovptr, int *cnt,
int *allocated)
{
struct iovec *iov;
struct mbuf *m, *mtmp;
int i, j;
*allocated = 0;
iov = *iovptr;
if (iov == NULL)
*cnt = 0;
m = mbuf;
i = 0;
while (m != NULL) {
if (i == *cnt) {
/* we need to allocate a larger array */
j = 1;
mtmp = m;
while ((mtmp = mtmp->m_next) != NULL)
j++;
iov = malloc(sizeof *iov * (i + j), M_CRYPTO_DATA,
M_NOWAIT);
if (iov == NULL)
return ENOMEM;
*allocated = 1;
*cnt = i + j;
memcpy(iov, *iovptr, sizeof *iov * i);
}
iov[i].iov_base = m->m_data;
iov[i].iov_len = m->m_len;
i++;
m = m->m_next;
}
if (*allocated)
KASSERT(*cnt == i, ("did not allocate correct amount: %d != %d",
*cnt, i));
*iovptr = iov;
*cnt = i;
return 0;
}
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