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