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 M_HASCL(m) ((m)->m_flags & M_EXT) 50 #define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \ 51 (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN)) 52 #define NFSM_DATAP(m, s) (m)->m_data += (s) 53 54 /* 55 * Now for the macros that do the simple stuff and call the functions 56 * for the hard stuff. 57 * They use fields in struct nfsrv_descript to handle the mbuf queues. 58 * Replace most of the macro with an inline function, to minimize 59 * the machine code. The inline functions in lower case can be called 60 * directly, bypassing the macro. 61 */ 62 static __inline void * 63 nfsm_build(struct nfsrv_descript *nd, int siz) 64 { 65 void *retp; 66 struct mbuf *mb2; 67 68 if (siz > M_TRAILINGSPACE(nd->nd_mb)) { 69 NFSMCLGET(mb2, M_NOWAIT); 70 if (siz > MLEN) 71 panic("build > MLEN"); 72 mbuf_setlen(mb2, 0); 73 nd->nd_bpos = NFSMTOD(mb2, caddr_t); 74 nd->nd_mb->m_next = mb2; 75 nd->nd_mb = mb2; 76 } 77 retp = (void *)(nd->nd_bpos); 78 nd->nd_mb->m_len += siz; 79 nd->nd_bpos += siz; 80 return (retp); 81 } 82 83 #define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s))) 84 85 static __inline void * 86 nfsm_dissect(struct nfsrv_descript *nd, int siz) 87 { 88 int tt1; 89 void *retp; 90 91 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 92 if (tt1 >= siz) { 93 retp = (void *)nd->nd_dpos; 94 nd->nd_dpos += siz; 95 } else { 96 retp = nfsm_dissct(nd, siz, M_WAITOK); 97 } 98 return (retp); 99 } 100 101 static __inline void * 102 nfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz) 103 { 104 int tt1; 105 void *retp; 106 107 tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 108 if (tt1 >= siz) { 109 retp = (void *)nd->nd_dpos; 110 nd->nd_dpos += siz; 111 } else { 112 retp = nfsm_dissct(nd, siz, M_NOWAIT); 113 } 114 return (retp); 115 } 116 117 #define NFSM_DISSECT(a, c, s) \ 118 do { \ 119 (a) = (c)nfsm_dissect(nd, (s)); \ 120 if ((a) == NULL) { \ 121 error = EBADRPC; \ 122 goto nfsmout; \ 123 } \ 124 } while (0) 125 126 #define NFSM_DISSECT_NONBLOCK(a, c, s) \ 127 do { \ 128 (a) = (c)nfsm_dissect_nonblock(nd, (s)); \ 129 if ((a) == NULL) { \ 130 error = EBADRPC; \ 131 goto nfsmout; \ 132 } \ 133 } while (0) 134 #endif /* !APPLE */ 135 136 #define NFSM_STRSIZ(s, m) \ 137 do { \ 138 tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \ 139 if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \ 140 error = EBADRPC; \ 141 goto nfsmout; \ 142 } \ 143 } while (0) 144 145 #define NFSM_RNDUP(a) (((a)+3)&(~0x3)) 146 147 #endif /* _NFS_NFSM_SUBS_H_ */ 148