1 /* $NetBSD: nfsm_subs.h,v 1.4 2016/12/13 22:52:46 pgoyette Exp $ */
2 /*-
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Rick Macklem at The University of Guelph.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * FreeBSD: head/sys/fs/nfs/nfsm_subs.h 276780 2015-01-07 17:22:56Z rwatson
34 * $NetBSD: nfsm_subs.h,v 1.4 2016/12/13 22:52:46 pgoyette Exp $
35 */
36
37 #ifndef _NFS_NFSM_SUBS_H_
38 #define _NFS_NFSM_SUBS_H_
39
40
41 /*
42 * These macros do strange and peculiar things to mbuf chains for
43 * the assistance of the nfs code. To attempt to use them for any
44 * other purpose will be dangerous. (they make weird assumptions)
45 */
46
47 #ifndef APPLE
48 /*
49 * First define what the actual subs. return
50 */
51 #define NFSM_DATAP(m, s) (m)->m_data += (s)
52
53 /*
54 * Now for the macros that do the simple stuff and call the functions
55 * for the hard stuff.
56 * They use fields in struct nfsrv_descript to handle the mbuf queues.
57 * Replace most of the macro with an inline function, to minimize
58 * the machine code. The inline functions in lower case can be called
59 * directly, bypassing the macro.
60 */
61 static __inline void *
nfsm_build(struct nfsrv_descript * nd,int siz)62 nfsm_build(struct nfsrv_descript *nd, int siz)
63 {
64 void *retp;
65 struct mbuf *mb2;
66
67 if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
68 NFSMCLGET(mb2, M_NOWAIT);
69 if (siz > MLEN)
70 panic("build > MLEN");
71 mbuf_setlen(mb2, 0);
72 nd->nd_bpos = NFSMTOD(mb2, char *);
73 nd->nd_mb->m_next = mb2;
74 nd->nd_mb = mb2;
75 }
76 retp = (void *)(nd->nd_bpos);
77 nd->nd_mb->m_len += siz;
78 nd->nd_bpos += siz;
79 return (retp);
80 }
81
82 #define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s)))
83
84 static __inline void *
nfsm_dissect(struct nfsrv_descript * nd,int siz)85 nfsm_dissect(struct nfsrv_descript *nd, int siz)
86 {
87 int tt1;
88 void *retp;
89
90 tt1 = NFSMTOD(nd->nd_md, char *) + nd->nd_md->m_len - nd->nd_dpos;
91 if (tt1 >= siz) {
92 retp = (void *)nd->nd_dpos;
93 nd->nd_dpos += siz;
94 } else {
95 retp = nfsm_dissct(nd, siz, M_WAITOK);
96 }
97 return (retp);
98 }
99
100 static __inline void *
nfsm_dissect_nonblock(struct nfsrv_descript * nd,int siz)101 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz)
102 {
103 int tt1;
104 void *retp;
105
106 tt1 = NFSMTOD(nd->nd_md, char *) + nd->nd_md->m_len - nd->nd_dpos;
107 if (tt1 >= siz) {
108 retp = (void *)nd->nd_dpos;
109 nd->nd_dpos += siz;
110 } else {
111 retp = nfsm_dissct(nd, siz, M_NOWAIT);
112 }
113 return (retp);
114 }
115
116 #define NFSM_DISSECT(a, c, s) \
117 do { \
118 (a) = (c)nfsm_dissect(nd, (s)); \
119 if ((a) == NULL) { \
120 error = EBADRPC; \
121 goto nfsmout; \
122 } \
123 } while (0)
124
125 #define NFSM_DISSECT_NONBLOCK(a, c, s) \
126 do { \
127 (a) = (c)nfsm_dissect_nonblock(nd, (s)); \
128 if ((a) == NULL) { \
129 error = EBADRPC; \
130 goto nfsmout; \
131 } \
132 } while (0)
133 #endif /* !APPLE */
134
135 #define NFSM_STRSIZ(s, m) \
136 do { \
137 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \
138 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \
139 error = EBADRPC; \
140 goto nfsmout; \
141 } \
142 } while (0)
143
144 #define NFSM_RNDUP(a) (((a)+3)&(~0x3))
145
146 #endif /* _NFS_NFSM_SUBS_H_ */
147