1191783Srmacklem/*- 2191783Srmacklem * Copyright (c) 1989, 1993 3191783Srmacklem * The Regents of the University of California. All rights reserved. 4191783Srmacklem * 5191783Srmacklem * This code is derived from software contributed to Berkeley by 6191783Srmacklem * Rick Macklem at The University of Guelph. 7191783Srmacklem * 8191783Srmacklem * Redistribution and use in source and binary forms, with or without 9191783Srmacklem * modification, are permitted provided that the following conditions 10191783Srmacklem * are met: 11191783Srmacklem * 1. Redistributions of source code must retain the above copyright 12191783Srmacklem * notice, this list of conditions and the following disclaimer. 13191783Srmacklem * 2. Redistributions in binary form must reproduce the above copyright 14191783Srmacklem * notice, this list of conditions and the following disclaimer in the 15191783Srmacklem * documentation and/or other materials provided with the distribution. 16191783Srmacklem * 4. Neither the name of the University nor the names of its contributors 17191783Srmacklem * may be used to endorse or promote products derived from this software 18191783Srmacklem * without specific prior written permission. 19191783Srmacklem * 20191783Srmacklem * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21191783Srmacklem * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22191783Srmacklem * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23191783Srmacklem * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24191783Srmacklem * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25191783Srmacklem * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26191783Srmacklem * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27191783Srmacklem * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28191783Srmacklem * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29191783Srmacklem * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30191783Srmacklem * SUCH DAMAGE. 31191783Srmacklem * 32191783Srmacklem * $FreeBSD$ 33191783Srmacklem */ 34191783Srmacklem 35191783Srmacklem#ifndef _NFS_NFSM_SUBS_H_ 36191783Srmacklem#define _NFS_NFSM_SUBS_H_ 37191783Srmacklem 38191783Srmacklem 39191783Srmacklem/* 40191783Srmacklem * These macros do strange and peculiar things to mbuf chains for 41191783Srmacklem * the assistance of the nfs code. To attempt to use them for any 42191783Srmacklem * other purpose will be dangerous. (they make weird assumptions) 43191783Srmacklem */ 44191783Srmacklem 45191783Srmacklem#ifndef APPLE 46191783Srmacklem/* 47191783Srmacklem * First define what the actual subs. return 48191783Srmacklem */ 49191783Srmacklem#define M_HASCL(m) ((m)->m_flags & M_EXT) 50191783Srmacklem#define NFSMINOFF(m) \ 51191783Srmacklem if (M_HASCL(m)) \ 52191783Srmacklem (m)->m_data = (m)->m_ext.ext_buf; \ 53191783Srmacklem else if ((m)->m_flags & M_PKTHDR) \ 54191783Srmacklem (m)->m_data = (m)->m_pktdat; \ 55191783Srmacklem else \ 56191783Srmacklem (m)->m_data = (m)->m_dat 57191783Srmacklem#define NFSMSIZ(m) ((M_HASCL(m))?MCLBYTES: \ 58191783Srmacklem (((m)->m_flags & M_PKTHDR)?MHLEN:MLEN)) 59191783Srmacklem#define NFSM_DATAP(m, s) (m)->m_data += (s) 60191783Srmacklem 61191783Srmacklem/* 62191783Srmacklem * Now for the macros that do the simple stuff and call the functions 63191783Srmacklem * for the hard stuff. 64191783Srmacklem * They use fields in struct nfsrv_descript to handle the mbuf queues. 65191783Srmacklem * Replace most of the macro with an inline function, to minimize 66191783Srmacklem * the machine code. The inline functions in lower case can be called 67191783Srmacklem * directly, bypassing the macro. 68191783Srmacklem */ 69191783Srmacklemstatic __inline void * 70191783Srmacklemnfsm_build(struct nfsrv_descript *nd, int siz) 71191783Srmacklem{ 72191783Srmacklem void *retp; 73191783Srmacklem struct mbuf *mb2; 74191783Srmacklem 75191783Srmacklem if (siz > M_TRAILINGSPACE(nd->nd_mb)) { 76191783Srmacklem NFSMCLGET(mb2, M_DONTWAIT); 77191783Srmacklem if (siz > MLEN) 78191783Srmacklem panic("build > MLEN"); 79191783Srmacklem mbuf_setlen(mb2, 0); 80191783Srmacklem nd->nd_bpos = NFSMTOD(mb2, caddr_t); 81191783Srmacklem nd->nd_mb->m_next = mb2; 82191783Srmacklem nd->nd_mb = mb2; 83191783Srmacklem } 84191783Srmacklem retp = (void *)(nd->nd_bpos); 85191783Srmacklem nd->nd_mb->m_len += siz; 86191783Srmacklem nd->nd_bpos += siz; 87191783Srmacklem return (retp); 88191783Srmacklem} 89191783Srmacklem 90191783Srmacklem#define NFSM_BUILD(a, c, s) ((a) = (c)nfsm_build(nd, (s))) 91191783Srmacklem 92191783Srmacklemstatic __inline void * 93191783Srmacklemnfsm_dissect(struct nfsrv_descript *nd, int siz) 94191783Srmacklem{ 95191783Srmacklem int tt1; 96191783Srmacklem void *retp; 97191783Srmacklem 98191783Srmacklem tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 99191783Srmacklem if (tt1 >= siz) { 100191783Srmacklem retp = (void *)nd->nd_dpos; 101191783Srmacklem nd->nd_dpos += siz; 102191783Srmacklem } else { 103251641Sken retp = nfsm_dissct(nd, siz, M_WAITOK); 104191783Srmacklem } 105191783Srmacklem return (retp); 106191783Srmacklem} 107191783Srmacklem 108251641Skenstatic __inline void * 109251641Skennfsm_dissect_nonblock(struct nfsrv_descript *nd, int siz) 110251641Sken{ 111251641Sken int tt1; 112251641Sken void *retp; 113251641Sken 114251641Sken tt1 = NFSMTOD(nd->nd_md, caddr_t) + nd->nd_md->m_len - nd->nd_dpos; 115251641Sken if (tt1 >= siz) { 116251641Sken retp = (void *)nd->nd_dpos; 117251641Sken nd->nd_dpos += siz; 118251641Sken } else { 119251641Sken retp = nfsm_dissct(nd, siz, M_NOWAIT); 120251641Sken } 121251641Sken return (retp); 122251641Sken} 123251641Sken 124191783Srmacklem#define NFSM_DISSECT(a, c, s) \ 125191783Srmacklem do { \ 126191783Srmacklem (a) = (c)nfsm_dissect(nd, (s)); \ 127191783Srmacklem if ((a) == NULL) { \ 128191783Srmacklem error = EBADRPC; \ 129191783Srmacklem goto nfsmout; \ 130191783Srmacklem } \ 131191783Srmacklem } while (0) 132251641Sken 133251641Sken#define NFSM_DISSECT_NONBLOCK(a, c, s) \ 134251641Sken do { \ 135251641Sken (a) = (c)nfsm_dissect_nonblock(nd, (s)); \ 136251641Sken if ((a) == NULL) { \ 137251641Sken error = EBADRPC; \ 138251641Sken goto nfsmout; \ 139251641Sken } \ 140251641Sken } while (0) 141191783Srmacklem#endif /* !APPLE */ 142191783Srmacklem 143191783Srmacklem#define NFSM_STRSIZ(s, m) \ 144191783Srmacklem do { \ 145191783Srmacklem tl = (u_int32_t *)nfsm_dissect(nd, NFSX_UNSIGNED); \ 146191783Srmacklem if (!tl || ((s) = fxdr_unsigned(int32_t, *tl)) > (m)) { \ 147191783Srmacklem error = EBADRPC; \ 148191783Srmacklem goto nfsmout; \ 149191783Srmacklem } \ 150191783Srmacklem } while (0) 151191783Srmacklem 152191783Srmacklem#define NFSM_RNDUP(a) (((a)+3)&(~0x3)) 153191783Srmacklem 154191783Srmacklem#endif /* _NFS_NFSM_SUBS_H_ */ 155