1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 36#include <sys/cdefs.h> 37/* 38 * These functions support the macros and help fiddle mbuf chains for 39 * the nfs op functions. They do things like create the rpc header and 40 * copy data between mbuf chains and uio lists. 41 */ 42#include <fs/nfs/nfsport.h> 43 44extern struct nfsstatsv1 nfsstatsv1; 45extern int ncl_mbuf_mlen; 46extern __enum_uint8(vtype) newnv2tov_type[8]; 47extern __enum_uint8(vtype) nv34tov_type[8]; 48NFSCLSTATEMUTEX; 49 50/* 51 * copies a uio scatter/gather list to an mbuf chain. 52 * NOTE: can only handle iovcnt == 1 53 */ 54int 55nfsm_uiombuf(struct nfsrv_descript *nd, struct uio *uiop, int siz) 56{ 57 char *uiocp; 58 struct mbuf *mp, *mp2; 59 int error, xfer, left, mlen; 60 int uiosiz, clflg, rem; 61 char *mcp, *tcp; 62 63 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1")); 64 65 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */ 66 clflg = 1; 67 else 68 clflg = 0; 69 rem = NFSM_RNDUP(siz) - siz; 70 mp = mp2 = nd->nd_mb; 71 mcp = nd->nd_bpos; 72 while (siz > 0) { 73 KASSERT((nd->nd_flag & ND_EXTPG) != 0 || mcp == 74 mtod(mp, char *) + mp->m_len, ("nfsm_uiombuf: mcp wrong")); 75 left = uiop->uio_iov->iov_len; 76 uiocp = uiop->uio_iov->iov_base; 77 if (left > siz) 78 left = siz; 79 uiosiz = left; 80 while (left > 0) { 81 if ((nd->nd_flag & ND_EXTPG) != 0) 82 mlen = nd->nd_bextpgsiz; 83 else 84 mlen = M_TRAILINGSPACE(mp); 85 if (mlen == 0) { 86 if ((nd->nd_flag & ND_EXTPG) != 0) { 87 mp = nfsm_add_ext_pgs(mp, 88 nd->nd_maxextsiz, &nd->nd_bextpg); 89 mcp = (char *)(void *)PHYS_TO_DMAP( 90 mp->m_epg_pa[nd->nd_bextpg]); 91 nd->nd_bextpgsiz = mlen = PAGE_SIZE; 92 } else { 93 if (clflg) 94 NFSMCLGET(mp, M_WAITOK); 95 else 96 NFSMGET(mp); 97 mp->m_len = 0; 98 mlen = M_TRAILINGSPACE(mp); 99 mcp = mtod(mp, char *); 100 mp2->m_next = mp; 101 mp2 = mp; 102 } 103 } 104 xfer = (left > mlen) ? mlen : left; 105 if (uiop->uio_segflg == UIO_SYSSPACE) 106 NFSBCOPY(uiocp, mcp, xfer); 107 else { 108 error = copyin(uiocp, mcp, xfer); 109 if (error != 0) 110 return (error); 111 } 112 mp->m_len += xfer; 113 left -= xfer; 114 uiocp += xfer; 115 mcp += xfer; 116 if ((nd->nd_flag & ND_EXTPG) != 0) { 117 nd->nd_bextpgsiz -= xfer; 118 mp->m_epg_last_len += xfer; 119 } 120 uiop->uio_offset += xfer; 121 uiop->uio_resid -= xfer; 122 } 123 tcp = (char *)uiop->uio_iov->iov_base; 124 tcp += uiosiz; 125 uiop->uio_iov->iov_base = (void *)tcp; 126 uiop->uio_iov->iov_len -= uiosiz; 127 siz -= uiosiz; 128 } 129 if (rem > 0) { 130 if ((nd->nd_flag & ND_EXTPG) == 0 && rem > 131 M_TRAILINGSPACE(mp)) { 132 NFSMGET(mp); 133 mp->m_len = 0; 134 mp2->m_next = mp; 135 mcp = mtod(mp, char *); 136 } else if ((nd->nd_flag & ND_EXTPG) != 0 && rem > 137 nd->nd_bextpgsiz) { 138 mp = nfsm_add_ext_pgs(mp, nd->nd_maxextsiz, 139 &nd->nd_bextpg); 140 mcp = (char *)(void *) 141 PHYS_TO_DMAP(mp->m_epg_pa[nd->nd_bextpg]); 142 nd->nd_bextpgsiz = PAGE_SIZE; 143 } 144 for (left = 0; left < rem; left++) 145 *mcp++ = '\0'; 146 mp->m_len += rem; 147 if ((nd->nd_flag & ND_EXTPG) != 0) { 148 nd->nd_bextpgsiz -= rem; 149 mp->m_epg_last_len += rem; 150 } 151 } 152 nd->nd_bpos = mcp; 153 nd->nd_mb = mp; 154 return (0); 155} 156 157/* 158 * copies a uio scatter/gather list to an mbuf chain. 159 * This version returns the mbuf list and does not use "nd". 160 * NOTE: can only handle iovcnt == 1 161 */ 162struct mbuf * 163nfsm_uiombuflist(struct uio *uiop, int siz, u_int maxext) 164{ 165 char *uiocp; 166 struct mbuf *mp, *mp2, *firstmp; 167 int error, extpg, extpgsiz = 0, i, left, mlen, rem, xfer; 168 int uiosiz, clflg; 169 char *mcp, *tcp; 170 171 KASSERT(uiop->uio_iovcnt == 1, ("nfsm_uiotombuf: iovcnt != 1")); 172 173 if (maxext > 0) { 174 mp = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK); 175 mcp = (char *)(void *)PHYS_TO_DMAP(mp->m_epg_pa[0]); 176 extpg = 0; 177 extpgsiz = PAGE_SIZE; 178 } else { 179 if (siz > ncl_mbuf_mlen) /* or should it >= MCLBYTES ?? */ 180 clflg = 1; 181 else 182 clflg = 0; 183 if (clflg != 0) 184 NFSMCLGET(mp, M_WAITOK); 185 else 186 NFSMGET(mp); 187 mcp = mtod(mp, char *); 188 } 189 mp->m_len = 0; 190 firstmp = mp2 = mp; 191 rem = NFSM_RNDUP(siz) - siz; 192 while (siz > 0) { 193 left = uiop->uio_iov->iov_len; 194 uiocp = uiop->uio_iov->iov_base; 195 if (left > siz) 196 left = siz; 197 uiosiz = left; 198 while (left > 0) { 199 if (maxext > 0) 200 mlen = extpgsiz; 201 else 202 mlen = M_TRAILINGSPACE(mp); 203 if (mlen == 0) { 204 if (maxext > 0) { 205 mp = nfsm_add_ext_pgs(mp, maxext, 206 &extpg); 207 mlen = extpgsiz = PAGE_SIZE; 208 mcp = (char *)(void *)PHYS_TO_DMAP( 209 mp->m_epg_pa[extpg]); 210 } else { 211 if (clflg) 212 NFSMCLGET(mp, M_WAITOK); 213 else 214 NFSMGET(mp); 215 mcp = mtod(mp, char *); 216 mlen = M_TRAILINGSPACE(mp); 217 mp->m_len = 0; 218 mp2->m_next = mp; 219 mp2 = mp; 220 } 221 } 222 xfer = (left > mlen) ? mlen : left; 223 if (uiop->uio_segflg == UIO_SYSSPACE) 224 NFSBCOPY(uiocp, mcp, xfer); 225 else { 226 error = copyin(uiocp, mcp, xfer); 227 if (error != 0) { 228 m_freem(firstmp); 229 return (NULL); 230 } 231 } 232 mp->m_len += xfer; 233 mcp += xfer; 234 if (maxext > 0) { 235 extpgsiz -= xfer; 236 mp->m_epg_last_len += xfer; 237 } 238 left -= xfer; 239 uiocp += xfer; 240 uiop->uio_offset += xfer; 241 uiop->uio_resid -= xfer; 242 } 243 tcp = (char *)uiop->uio_iov->iov_base; 244 tcp += uiosiz; 245 uiop->uio_iov->iov_base = (void *)tcp; 246 uiop->uio_iov->iov_len -= uiosiz; 247 siz -= uiosiz; 248 } 249 if (rem > 0) { 250 KASSERT((mp->m_flags & M_EXTPG) != 0 || 251 rem <= M_TRAILINGSPACE(mp), 252 ("nfsm_uiombuflist: no space for padding")); 253 for (i = 0; i < rem; i++) 254 *mcp++ = '\0'; 255 mp->m_len += rem; 256 if (maxext > 0) 257 mp->m_epg_last_len += rem; 258 } 259 return (firstmp); 260} 261 262/* 263 * Load vnode attributes from the xdr file attributes. 264 * Returns EBADRPC if they can't be parsed, 0 otherwise. 265 */ 266int 267nfsm_loadattr(struct nfsrv_descript *nd, struct nfsvattr *nap) 268{ 269 struct nfs_fattr *fp; 270 int error = 0; 271 272 if (nd->nd_flag & ND_NFSV4) { 273 error = nfsv4_loadattr(nd, NULL, nap, NULL, NULL, 0, NULL, 274 NULL, NULL, NULL, NULL, 0, NULL, NULL, NULL, NULL, NULL); 275 } else if (nd->nd_flag & ND_NFSV3) { 276 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V3FATTR); 277 nap->na_type = nfsv34tov_type(fp->fa_type); 278 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode); 279 nap->na_rdev = NFSMAKEDEV( 280 fxdr_unsigned(int, fp->fa3_rdev.specdata1), 281 fxdr_unsigned(int, fp->fa3_rdev.specdata2)); 282 nap->na_nlink = fxdr_unsigned(uint32_t, fp->fa_nlink); 283 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid); 284 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid); 285 nap->na_size = fxdr_hyper(&fp->fa3_size); 286 nap->na_blocksize = NFS_FABLKSIZE; 287 nap->na_bytes = fxdr_hyper(&fp->fa3_used); 288 nap->na_fileid = fxdr_hyper(&fp->fa3_fileid); 289 fxdr_nfsv3time(&fp->fa3_atime, &nap->na_atime); 290 fxdr_nfsv3time(&fp->fa3_ctime, &nap->na_ctime); 291 fxdr_nfsv3time(&fp->fa3_mtime, &nap->na_mtime); 292 nap->na_btime.tv_sec = -1; 293 nap->na_btime.tv_nsec = 0; 294 nap->na_flags = 0; 295 nap->na_gen = 0; 296 nap->na_filerev = 0; 297 } else { 298 NFSM_DISSECT(fp, struct nfs_fattr *, NFSX_V2FATTR); 299 nap->na_type = nfsv2tov_type(fp->fa_type); 300 nap->na_mode = fxdr_unsigned(u_short, fp->fa_mode); 301 if (nap->na_type == VNON || nap->na_type == VREG) 302 nap->na_type = IFTOVT(nap->na_mode); 303 nap->na_rdev = fxdr_unsigned(dev_t, fp->fa2_rdev); 304 305 /* 306 * Really ugly NFSv2 kludge. 307 */ 308 if (nap->na_type == VCHR && nap->na_rdev == ((dev_t)-1)) 309 nap->na_type = VFIFO; 310 nap->na_nlink = fxdr_unsigned(u_short, fp->fa_nlink); 311 nap->na_uid = fxdr_unsigned(uid_t, fp->fa_uid); 312 nap->na_gid = fxdr_unsigned(gid_t, fp->fa_gid); 313 nap->na_size = fxdr_unsigned(u_int32_t, fp->fa2_size); 314 nap->na_blocksize = fxdr_unsigned(int32_t, fp->fa2_blocksize); 315 nap->na_bytes = 316 (u_quad_t)fxdr_unsigned(int32_t, fp->fa2_blocks) * 317 NFS_FABLKSIZE; 318 nap->na_fileid = fxdr_unsigned(uint64_t, fp->fa2_fileid); 319 fxdr_nfsv2time(&fp->fa2_atime, &nap->na_atime); 320 fxdr_nfsv2time(&fp->fa2_mtime, &nap->na_mtime); 321 nap->na_flags = 0; 322 nap->na_ctime.tv_sec = fxdr_unsigned(u_int32_t, 323 fp->fa2_ctime.nfsv2_sec); 324 nap->na_ctime.tv_nsec = 0; 325 nap->na_btime.tv_sec = -1; 326 nap->na_btime.tv_nsec = 0; 327 nap->na_gen = fxdr_unsigned(u_int32_t,fp->fa2_ctime.nfsv2_usec); 328 nap->na_filerev = 0; 329 } 330nfsmout: 331 return (error); 332} 333 334/* 335 * Gets a file handle out of an nfs reply sent to the client and returns 336 * the file handle and the file's attributes. 337 * For V4, it assumes that Getfh and Getattr Op's results are here. 338 */ 339int 340nfscl_mtofh(struct nfsrv_descript *nd, struct nfsfh **nfhpp, 341 struct nfsvattr *nap, int *attrflagp) 342{ 343 u_int32_t *tl; 344 int error = 0, flag = 1; 345 346 *nfhpp = NULL; 347 *attrflagp = 0; 348 /* 349 * First get the file handle and vnode. 350 */ 351 if (nd->nd_flag & ND_NFSV3) { 352 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 353 flag = fxdr_unsigned(int, *tl); 354 } else if (nd->nd_flag & ND_NFSV4) { 355 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 356 /* If the GetFH failed, clear flag. */ 357 if (*++tl != 0) { 358 nd->nd_flag |= ND_NOMOREDATA; 359 flag = 0; 360 error = ENXIO; /* Return ENXIO so *nfhpp isn't used. */ 361 } 362 } 363 if (flag) { 364 error = nfsm_getfh(nd, nfhpp); 365 if (error) 366 return (error); 367 } 368 369 /* 370 * Now, get the attributes. 371 */ 372 if (flag != 0 && (nd->nd_flag & ND_NFSV4) != 0) { 373 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 374 if (*++tl != 0) { 375 nd->nd_flag |= ND_NOMOREDATA; 376 flag = 0; 377 } 378 } else if (nd->nd_flag & ND_NFSV3) { 379 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 380 if (flag) { 381 flag = fxdr_unsigned(int, *tl); 382 } else if (fxdr_unsigned(int, *tl)) { 383 error = nfsm_advance(nd, NFSX_V3FATTR, -1); 384 if (error) 385 return (error); 386 } 387 } 388 if (flag) { 389 error = nfsm_loadattr(nd, nap); 390 if (!error) 391 *attrflagp = 1; 392 } 393nfsmout: 394 return (error); 395} 396 397/* 398 * Initialize the owner/delegation sleep lock. 399 */ 400void 401nfscl_lockinit(struct nfsv4lock *lckp) 402{ 403 404 lckp->nfslock_usecnt = 0; 405 lckp->nfslock_lock = 0; 406} 407 408/* 409 * Get an exclusive lock. (Not needed for OpenBSD4, since there is only one 410 * thread for each posix process in the kernel.) 411 */ 412void 413nfscl_lockexcl(struct nfsv4lock *lckp, void *mutex) 414{ 415 int igotlock; 416 417 do { 418 igotlock = nfsv4_lock(lckp, 1, NULL, mutex, NULL); 419 } while (!igotlock); 420} 421 422/* 423 * Release an exclusive lock. 424 */ 425void 426nfscl_lockunlock(struct nfsv4lock *lckp) 427{ 428 429 nfsv4_unlock(lckp, 0); 430} 431 432/* 433 * Called to dereference a lock on a stateid (delegation or open owner). 434 */ 435void 436nfscl_lockderef(struct nfsv4lock *lckp) 437{ 438 439 NFSLOCKCLSTATE(); 440 lckp->nfslock_usecnt--; 441 if (lckp->nfslock_usecnt == 0 && (lckp->nfslock_lock & NFSV4LOCK_WANTED)) { 442 lckp->nfslock_lock &= ~NFSV4LOCK_WANTED; 443 wakeup((caddr_t)lckp); 444 } 445 NFSUNLOCKCLSTATE(); 446} 447