2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Authors: Doug Rabson <dfr@rabson.org>
6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
36 #include <rpc/types.h>
39 static void xdrmbuf_destroy(XDR *);
40 static bool_t xdrmbuf_getlong(XDR *, long *);
41 static bool_t xdrmbuf_putlong(XDR *, const long *);
42 static bool_t xdrmbuf_getbytes(XDR *, char *, u_int);
43 static bool_t xdrmbuf_putbytes(XDR *, const char *, u_int);
44 /* XXX: w/64-bit pointers, u_int not enough! */
45 static u_int xdrmbuf_getpos(XDR *);
46 static bool_t xdrmbuf_setpos(XDR *, u_int);
47 static int32_t *xdrmbuf_inline(XDR *, u_int);
49 static const struct xdr_ops xdrmbuf_ops = {
61 * The procedure xdrmbuf_create initializes a stream descriptor for a
65 xdrmbuf_create(XDR *xdrs, struct mbuf *m, enum xdr_op op)
68 KASSERT(m != NULL, ("xdrmbuf_create with NULL mbuf chain"));
70 xdrs->x_ops = &xdrmbuf_ops;
71 xdrs->x_base = (char *) m;
72 if (op == XDR_ENCODE) {
75 xdrs->x_handy = m->m_len;
83 xdrmbuf_append(XDR *xdrs, struct mbuf *madd)
87 KASSERT(xdrs->x_ops == &xdrmbuf_ops && xdrs->x_op == XDR_ENCODE,
88 ("xdrmbuf_append: invalid XDR stream"));
90 if (m_length(madd, NULL) == 0) {
95 m = (struct mbuf *) xdrs->x_private;
100 xdrs->x_handy = m->m_len;
104 xdrmbuf_getall(XDR *xdrs)
108 KASSERT(xdrs->x_ops == &xdrmbuf_ops && xdrs->x_op == XDR_DECODE,
109 ("xdrmbuf_append: invalid XDR stream"));
111 m0 = (struct mbuf *) xdrs->x_base;
112 m = (struct mbuf *) xdrs->x_private;
114 while (m0->m_next != m)
117 xdrs->x_private = NULL;
120 xdrs->x_private = NULL;
124 m_adj(m, xdrs->x_handy);
126 m = m_get(M_WAITOK, MT_DATA);
131 xdrmbuf_destroy(XDR *xdrs)
134 if (xdrs->x_op == XDR_DECODE && xdrs->x_base) {
135 m_freem((struct mbuf *) xdrs->x_base);
137 xdrs->x_private = NULL;
142 xdrmbuf_getlong(XDR *xdrs, long *lp)
147 p = xdrmbuf_inline(xdrs, sizeof(int32_t));
151 xdrmbuf_getbytes(xdrs, (char *) &t, sizeof(int32_t));
159 xdrmbuf_putlong(XDR *xdrs, const long *lp)
162 int32_t t = htonl(*lp);
164 p = xdrmbuf_inline(xdrs, sizeof(int32_t));
169 return (xdrmbuf_putbytes(xdrs, (char *) &t, sizeof(int32_t)));
174 xdrmbuf_getbytes(XDR *xdrs, char *addr, u_int len)
176 struct mbuf *m = (struct mbuf *) xdrs->x_private;
181 * Make sure we haven't hit the end.
188 * See how much we can get from this mbuf.
190 sz = m->m_len - xdrs->x_handy;
193 bcopy(mtod(m, const char *) + xdrs->x_handy, addr, sz);
199 if (xdrs->x_handy == m->m_len) {
201 xdrs->x_private = (void *) m;
210 xdrmbuf_putbytes(XDR *xdrs, const char *addr, u_int len)
212 struct mbuf *m = (struct mbuf *) xdrs->x_private;
217 sz = M_TRAILINGSPACE(m) + (m->m_len - xdrs->x_handy);
220 bcopy(addr, mtod(m, char *) + xdrs->x_handy, sz);
223 if (xdrs->x_handy > m->m_len)
224 m->m_len = xdrs->x_handy;
227 if (xdrs->x_handy == m->m_len && M_TRAILINGSPACE(m) == 0) {
229 if (m->m_flags & M_EXT)
230 n = m_getcl(M_WAITOK, m->m_type, 0);
232 n = m_get(M_WAITOK, m->m_type);
236 xdrs->x_private = (void *) m;
245 xdrmbuf_getpos(XDR *xdrs)
247 struct mbuf *m0 = (struct mbuf *) xdrs->x_base;
248 struct mbuf *m = (struct mbuf *) xdrs->x_private;
251 while (m0 && m0 != m) {
255 KASSERT(m0, ("Corrupted mbuf chain"));
257 return (pos + xdrs->x_handy);
261 xdrmbuf_setpos(XDR *xdrs, u_int pos)
263 struct mbuf *m = (struct mbuf *) xdrs->x_base;
265 while (m && pos > m->m_len) {
269 KASSERT(m, ("Corrupted mbuf chain"));
271 xdrs->x_private = (void *) m;
278 xdrmbuf_inline(XDR *xdrs, u_int len)
280 struct mbuf *m = (struct mbuf *) xdrs->x_private;
286 if (xdrs->x_op == XDR_ENCODE) {
287 available = M_TRAILINGSPACE(m) + (m->m_len - xdrs->x_handy);
289 available = m->m_len - xdrs->x_handy;
292 if (available >= len) {
293 p = mtod(m, char *) + xdrs->x_handy;
294 if (((uintptr_t) p) & (sizeof(int32_t) - 1))
296 xdrs->x_handy += len;
297 if (xdrs->x_handy > m->m_len)
298 m->m_len = xdrs->x_handy;
299 return ((int32_t *) p);