freebsd-dev/sys/xdr/xdr_mbuf.c
Pedro F. Giffuni fe267a5590 sys: general adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

No functional change intended.
2017-11-27 15:23:17 +00:00

308 lines
6.7 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
* Authors: Doug Rabson <dfr@rabson.org>
* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/malloc.h>
#include <sys/mbuf.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
static void xdrmbuf_destroy(XDR *);
static bool_t xdrmbuf_getlong(XDR *, long *);
static bool_t xdrmbuf_putlong(XDR *, const long *);
static bool_t xdrmbuf_getbytes(XDR *, char *, u_int);
static bool_t xdrmbuf_putbytes(XDR *, const char *, u_int);
/* XXX: w/64-bit pointers, u_int not enough! */
static u_int xdrmbuf_getpos(XDR *);
static bool_t xdrmbuf_setpos(XDR *, u_int);
static int32_t *xdrmbuf_inline(XDR *, u_int);
static const struct xdr_ops xdrmbuf_ops = {
xdrmbuf_getlong,
xdrmbuf_putlong,
xdrmbuf_getbytes,
xdrmbuf_putbytes,
xdrmbuf_getpos,
xdrmbuf_setpos,
xdrmbuf_inline,
xdrmbuf_destroy
};
/*
* The procedure xdrmbuf_create initializes a stream descriptor for a
* mbuf.
*/
void
xdrmbuf_create(XDR *xdrs, struct mbuf *m, enum xdr_op op)
{
KASSERT(m != NULL, ("xdrmbuf_create with NULL mbuf chain"));
xdrs->x_op = op;
xdrs->x_ops = &xdrmbuf_ops;
xdrs->x_base = (char *) m;
if (op == XDR_ENCODE) {
m = m_last(m);
xdrs->x_private = m;
xdrs->x_handy = m->m_len;
} else {
xdrs->x_private = m;
xdrs->x_handy = 0;
}
}
void
xdrmbuf_append(XDR *xdrs, struct mbuf *madd)
{
struct mbuf *m;
KASSERT(xdrs->x_ops == &xdrmbuf_ops && xdrs->x_op == XDR_ENCODE,
("xdrmbuf_append: invalid XDR stream"));
if (m_length(madd, NULL) == 0) {
m_freem(madd);
return;
}
m = (struct mbuf *) xdrs->x_private;
m->m_next = madd;
m = m_last(madd);
xdrs->x_private = m;
xdrs->x_handy = m->m_len;
}
struct mbuf *
xdrmbuf_getall(XDR *xdrs)
{
struct mbuf *m0, *m;
KASSERT(xdrs->x_ops == &xdrmbuf_ops && xdrs->x_op == XDR_DECODE,
("xdrmbuf_append: invalid XDR stream"));
m0 = (struct mbuf *) xdrs->x_base;
m = (struct mbuf *) xdrs->x_private;
if (m0 != m) {
while (m0->m_next != m)
m0 = m0->m_next;
m0->m_next = NULL;
xdrs->x_private = NULL;
} else {
xdrs->x_base = NULL;
xdrs->x_private = NULL;
}
if (m)
m_adj(m, xdrs->x_handy);
else
m = m_get(M_WAITOK, MT_DATA);
return (m);
}
static void
xdrmbuf_destroy(XDR *xdrs)
{
if (xdrs->x_op == XDR_DECODE && xdrs->x_base) {
m_freem((struct mbuf *) xdrs->x_base);
xdrs->x_base = NULL;
xdrs->x_private = NULL;
}
}
static bool_t
xdrmbuf_getlong(XDR *xdrs, long *lp)
{
int32_t *p;
int32_t t;
p = xdrmbuf_inline(xdrs, sizeof(int32_t));
if (p) {
t = *p;
} else {
xdrmbuf_getbytes(xdrs, (char *) &t, sizeof(int32_t));
}
*lp = ntohl(t);
return (TRUE);
}
static bool_t
xdrmbuf_putlong(xdrs, lp)
XDR *xdrs;
const long *lp;
{
int32_t *p;
int32_t t = htonl(*lp);
p = xdrmbuf_inline(xdrs, sizeof(int32_t));
if (p) {
*p = t;
return (TRUE);
} else {
return (xdrmbuf_putbytes(xdrs, (char *) &t, sizeof(int32_t)));
}
}
static bool_t
xdrmbuf_getbytes(XDR *xdrs, char *addr, u_int len)
{
struct mbuf *m = (struct mbuf *) xdrs->x_private;
size_t sz;
while (len > 0) {
/*
* Make sure we haven't hit the end.
*/
if (!m) {
return (FALSE);
}
/*
* See how much we can get from this mbuf.
*/
sz = m->m_len - xdrs->x_handy;
if (sz > len)
sz = len;
bcopy(mtod(m, const char *) + xdrs->x_handy, addr, sz);
addr += sz;
xdrs->x_handy += sz;
len -= sz;
if (xdrs->x_handy == m->m_len) {
m = m->m_next;
xdrs->x_private = (void *) m;
xdrs->x_handy = 0;
}
}
return (TRUE);
}
static bool_t
xdrmbuf_putbytes(XDR *xdrs, const char *addr, u_int len)
{
struct mbuf *m = (struct mbuf *) xdrs->x_private;
struct mbuf *n;
size_t sz;
while (len > 0) {
sz = M_TRAILINGSPACE(m) + (m->m_len - xdrs->x_handy);
if (sz > len)
sz = len;
bcopy(addr, mtod(m, char *) + xdrs->x_handy, sz);
addr += sz;
xdrs->x_handy += sz;
if (xdrs->x_handy > m->m_len)
m->m_len = xdrs->x_handy;
len -= sz;
if (xdrs->x_handy == m->m_len && M_TRAILINGSPACE(m) == 0) {
if (!m->m_next) {
if (m->m_flags & M_EXT)
n = m_getcl(M_WAITOK, m->m_type, 0);
else
n = m_get(M_WAITOK, m->m_type);
m->m_next = n;
}
m = m->m_next;
xdrs->x_private = (void *) m;
xdrs->x_handy = 0;
}
}
return (TRUE);
}
static u_int
xdrmbuf_getpos(XDR *xdrs)
{
struct mbuf *m0 = (struct mbuf *) xdrs->x_base;
struct mbuf *m = (struct mbuf *) xdrs->x_private;
u_int pos = 0;
while (m0 && m0 != m) {
pos += m0->m_len;
m0 = m0->m_next;
}
KASSERT(m0, ("Corrupted mbuf chain"));
return (pos + xdrs->x_handy);
}
static bool_t
xdrmbuf_setpos(XDR *xdrs, u_int pos)
{
struct mbuf *m = (struct mbuf *) xdrs->x_base;
while (m && pos > m->m_len) {
pos -= m->m_len;
m = m->m_next;
}
KASSERT(m, ("Corrupted mbuf chain"));
xdrs->x_private = (void *) m;
xdrs->x_handy = pos;
return (TRUE);
}
static int32_t *
xdrmbuf_inline(XDR *xdrs, u_int len)
{
struct mbuf *m = (struct mbuf *) xdrs->x_private;
size_t available;
char *p;
if (!m)
return (0);
if (xdrs->x_op == XDR_ENCODE) {
available = M_TRAILINGSPACE(m) + (m->m_len - xdrs->x_handy);
} else {
available = m->m_len - xdrs->x_handy;
}
if (available >= len) {
p = mtod(m, char *) + xdrs->x_handy;
if (((uintptr_t) p) & (sizeof(int32_t) - 1))
return (0);
xdrs->x_handy += len;
if (xdrs->x_handy > m->m_len)
m->m_len = xdrs->x_handy;
return ((int32_t *) p);
}
return (0);
}