nfsm_subs.h revision 1.36
1/* $OpenBSD: nfsm_subs.h,v 1.36 2009/06/04 00:31:42 blambert Exp $ */ 2/* $NetBSD: nfsm_subs.h,v 1.10 1996/03/20 21:59:56 fvdl Exp $ */ 3 4/* 5 * Copyright (c) 1989, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfsm_subs.h 8.2 (Berkeley) 3/30/95 36 */ 37 38 39#ifndef _NFS_NFSM_SUBS_H_ 40#define _NFS_NFSM_SUBS_H_ 41 42 43/* 44 * These macros do strange and peculiar things to mbuf chains for 45 * the assistance of the nfs code. To attempt to use them for any 46 * other purpose will be dangerous. (they make weird assumptions) 47 */ 48 49/* 50 * First define what the actual subs. return 51 */ 52 53#define M_HASCL(m) ((m)->m_flags & M_EXT) 54#define NFSMSIZ(m) ((M_HASCL(m)) ? (m)->m_ext.ext_size : \ 55 (((m)->m_flags & M_PKTHDR) ? MHLEN : MLEN)) 56 57/* 58 * Now for the macros that do the simple stuff and call the functions 59 * for the hard stuff. 60 * These macros use several vars. declared in nfsm_reqhead and these 61 * vars. must not be used elsewhere unless you are careful not to corrupt 62 * them. The vars. starting with pN and tN (N=1,2,3,..) are temporaries 63 * that may be used so long as the value is not expected to retained 64 * after a macro. 65 * I know, this is kind of dorkey, but it makes the actual op functions 66 * fairly clean and deals with the mess caused by the xdr discriminating 67 * unions. 68 */ 69 70#define nfsm_dissect(a, c, s) \ 71 { t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 72 if (t1 >= (s)) { \ 73 (a) = (c)(dpos); \ 74 dpos += (s); \ 75 } else if ((t1 = nfsm_disct(&md, &dpos, (s), t1, &cp2)) != 0){ \ 76 error = t1; \ 77 m_freem(mrep); \ 78 goto nfsmout; \ 79 } else { \ 80 (a) = (c)cp2; \ 81 } } 82 83#define nfsm_srvpostop_fh(f) \ 84 { tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED + NFSX_V3FH); \ 85 *tl++ = nfs_true; \ 86 *tl++ = txdr_unsigned(NFSX_V3FH); \ 87 bcopy((caddr_t)(f), (caddr_t)tl, NFSX_V3FH); \ 88 } 89 90#define nfsm_mtofh(d, v, v3, f) \ 91 { struct nfsnode *ttnp; nfsfh_t *ttfhp; int ttfhsize; \ 92 if (v3) { \ 93 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \ 94 (f) = fxdr_unsigned(int, *tl); \ 95 } else \ 96 (f) = 1; \ 97 if (f) { \ 98 nfsm_getfh(ttfhp, ttfhsize, (v3)); \ 99 if ((t1 = nfs_nget((d)->v_mount, ttfhp, ttfhsize, \ 100 &ttnp)) != 0) { \ 101 error = t1; \ 102 m_freem(mrep); \ 103 goto nfsmout; \ 104 } \ 105 (v) = NFSTOV(ttnp); \ 106 } \ 107 if (v3) { \ 108 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \ 109 if (f) \ 110 (f) = fxdr_unsigned(int, *tl); \ 111 else if (fxdr_unsigned(int, *tl)) \ 112 nfsm_adv(NFSX_V3FATTR); \ 113 } \ 114 if (f) \ 115 nfsm_loadattr((v), (struct vattr *)0); \ 116 } 117 118#define nfsm_getfh(f, s, v3) \ 119 { if (v3) { \ 120 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \ 121 if (((s) = fxdr_unsigned(int, *tl)) <= 0 || \ 122 (s) > NFSX_V3FHMAX) { \ 123 m_freem(mrep); \ 124 error = EBADRPC; \ 125 goto nfsmout; \ 126 } \ 127 } else \ 128 (s) = NFSX_V2FH; \ 129 nfsm_dissect((f), nfsfh_t *, nfsm_rndup(s)); } 130 131#define nfsm_loadattr(v, a) \ 132 { struct vnode *ttvp = (v); \ 133 if ((t1 = nfs_loadattrcache(&ttvp, &md, &dpos, (a))) != 0) { \ 134 error = t1; \ 135 m_freem(mrep); \ 136 goto nfsmout; \ 137 } \ 138 (v) = ttvp; } 139 140#define nfsm_postop_attr(v, f) \ 141 { struct vnode *ttvp = (v); \ 142 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \ 143 if (((f) = fxdr_unsigned(int, *tl)) != 0) { \ 144 if ((t1 = nfs_loadattrcache(&ttvp, &md, &dpos, \ 145 (struct vattr *)0)) != 0) { \ 146 error = t1; \ 147 (f) = 0; \ 148 m_freem(mrep); \ 149 goto nfsmout; \ 150 } \ 151 (v) = ttvp; \ 152 } } 153 154/* Used as (f) for nfsm_wcc_data() */ 155#define NFSV3_WCCRATTR 0 156#define NFSV3_WCCCHK 1 157 158#define nfsm_wcc_data(v, f) do { \ 159 struct timespec _mtime; \ 160 int ttattrf, ttretf = 0; \ 161 \ 162 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \ 163 if (*tl == nfs_true) { \ 164 nfsm_dissect(tl, u_int32_t *, 6 * NFSX_UNSIGNED); \ 165 fxdr_nfsv3time(tl + 2, &_mtime); \ 166 if (f) { \ 167 ttretf = timespeccmp(&VTONFS(v)->n_mtime, \ 168 &_mtime, !=); \ 169 } \ 170 } \ 171 nfsm_postop_attr((v), ttattrf); \ 172 if (f) { \ 173 (f) = ttretf; \ 174 } else { \ 175 (f) = ttattrf; \ 176 } \ 177} while (0) 178 179#define nfsm_strsiz(s,m) \ 180 { nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \ 181 if (((s) = fxdr_unsigned(int32_t,*tl)) > (m)) { \ 182 m_freem(mrep); \ 183 error = EBADRPC; \ 184 goto nfsmout; \ 185 } } 186 187#define nfsm_srvnamesiz(s) \ 188 { nfsm_dissect(tl,u_int32_t *,NFSX_UNSIGNED); \ 189 if (((s) = fxdr_unsigned(int32_t,*tl)) > NFS_MAXNAMLEN) \ 190 error = NFSERR_NAMETOL; \ 191 if ((s) <= 0) \ 192 error = EBADRPC; \ 193 if (error) \ 194 nfsm_reply(0); \ 195 } 196 197#define nfsm_mtouio(p,s) \ 198 if ((s) > 0 && \ 199 (t1 = nfsm_mbuftouio(&md,(p),(s),&dpos)) != 0) { \ 200 error = t1; \ 201 m_freem(mrep); \ 202 goto nfsmout; \ 203 } 204 205#define nfsm_rndup(a) (((a)+3)&(~0x3)) 206 207#define nfsm_strtom(a,s,m) \ 208 if ((s) > (m)) { \ 209 m_freem(mreq); \ 210 error = ENAMETOOLONG; \ 211 goto nfsmout; \ 212 } \ 213 nfsm_strtombuf(&mb, (a), (s)) 214 215#define nfsm_reply(s) \ 216 { \ 217 nfsd->nd_repstat = error; \ 218 if (error && !(nfsd->nd_flag & ND_NFSV3)) \ 219 (void) nfs_rephead(0, nfsd, slp, error, \ 220 mrq, &mb); \ 221 else \ 222 (void) nfs_rephead((s), nfsd, slp, error, \ 223 mrq, &mb); \ 224 if (mrep != NULL) { \ 225 m_freem(mrep); \ 226 mrep = NULL; \ 227 } \ 228 mreq = *mrq; \ 229 if (error && (!(nfsd->nd_flag & ND_NFSV3) || \ 230 error == EBADRPC)) \ 231 return(0); \ 232 } 233 234#define nfsm_writereply(s, v3) \ 235 { \ 236 nfsd->nd_repstat = error; \ 237 if (error && !(v3)) \ 238 (void) nfs_rephead(0, nfsd, slp, error, \ 239 &mreq, &mb); \ 240 else \ 241 (void) nfs_rephead((s), nfsd, slp, error, \ 242 &mreq, &mb); \ 243 } 244 245#define nfsm_adv(s) \ 246 { t1 = mtod(md, caddr_t)+md->m_len-dpos; \ 247 if (t1 >= (s)) { \ 248 dpos += (s); \ 249 } else if ((t1 = nfs_adv(&md, &dpos, (s), t1)) != 0) { \ 250 error = t1; \ 251 m_freem(mrep); \ 252 goto nfsmout; \ 253 } } 254 255#define nfsm_srvmtofh(f) \ 256 { if (nfsd->nd_flag & ND_NFSV3) { \ 257 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); \ 258 if (fxdr_unsigned(int, *tl) != NFSX_V3FH) { \ 259 error = EBADRPC; \ 260 nfsm_reply(0); \ 261 } \ 262 } \ 263 nfsm_dissect(tl, u_int32_t *, NFSX_V3FH); \ 264 bcopy((caddr_t)tl, (caddr_t)(f), NFSX_V3FH); \ 265 if ((nfsd->nd_flag & ND_NFSV3) == 0) \ 266 nfsm_adv(NFSX_V2FH - NFSX_V3FH); \ 267 } 268 269#endif 270