sys/fs/nfsserver/nfs_nfsdport.c

   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 __FBSDID("$FreeBSD$");
  38
  39 #include <sys/capsicum.h>
  40
  41 /*
  42  * Functions that perform the vfs operations required by the routines in
  43  * nfsd_serv.c. It is hoped that this change will make the server more
  44  * portable.
  45  */
  46
  47 #include <fs/nfs/nfsport.h>
  48 #include <sys/hash.h>
  49 #include <sys/sysctl.h>
  50 #include <nlm/nlm_prot.h>
  51 #include <nlm/nlm.h>
  52
  53 FEATURE(nfsd, "NFSv4 server");
  54
  55 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
  56 extern int nfsrv_useacl;
  57 extern int newnfs_numnfsd;
  58 extern struct mount nfsv4root_mnt;
  59 extern struct nfsrv_stablefirst nfsrv_stablefirst;
  60 extern void (*nfsd_call_servertimer)(void);
  61 extern SVCPOOL  *nfsrvd_pool;
  62 extern struct nfsv4lock nfsd_suspend_lock;
  63 extern struct nfsclienthashhead *nfsclienthash;
  64 extern struct nfslockhashhead *nfslockhash;
  65 extern struct nfssessionhash *nfssessionhash;
  66 extern int nfsrv_sessionhashsize;
  67 extern struct nfsstatsv1 nfsstatsv1;
  68 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  69 NFSDLOCKMUTEX;
  70 struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
  71 struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
  72 struct mtx nfsrc_udpmtx;
  73 struct mtx nfs_v4root_mutex;
  74 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  75 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  76 struct proc *nfsd_master_proc = NULL;
  77 int nfsd_debuglevel = 0;
  78 static pid_t nfsd_master_pid = (pid_t)-1;
  79 static char nfsd_master_comm[MAXCOMLEN + 1];
  80 static struct timeval nfsd_master_start;
  81 static uint32_t nfsv4_sysid = 0;
  82
  83 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  84     struct ucred *);
  85
  86 int nfsrv_enable_crossmntpt = 1;
  87 static int nfs_commit_blks;
  88 static int nfs_commit_miss;
  89 extern int nfsrv_issuedelegs;
  90 extern int nfsrv_dolocallocks;
  91 extern int nfsd_enable_stringtouid;
  92
  93 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "NFS server");
  94 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
  95     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
  96 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  97     0, "");
  98 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  99     0, "");
 100 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
 101     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
 102 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
 103     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
 104 SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
 105     0, "Debug level for NFS server");
 106 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
 107     &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
 108
 109 #define MAX_REORDERED_RPC       16
 110 #define NUM_HEURISTIC           1031
 111 #define NHUSE_INIT              64
 112 #define NHUSE_INC               16
 113 #define NHUSE_MAX               2048
 114
 115 static struct nfsheur {
 116         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
 117         off_t nh_nextoff;       /* next offset for sequential detection */
 118         int nh_use;             /* use count for selection */
 119         int nh_seqcount;        /* heuristic */
 120 } nfsheur[NUM_HEURISTIC];
 121
 122
 123 /*
 124  * Heuristic to detect sequential operation.
 125  */
 126 static struct nfsheur *
 127 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
 128 {
 129         struct nfsheur *nh;
 130         int hi, try;
 131
 132         /* Locate best candidate. */
 133         try = 32;
 134         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 135         nh = &nfsheur[hi];
 136         while (try--) {
 137                 if (nfsheur[hi].nh_vp == vp) {
 138                         nh = &nfsheur[hi];
 139                         break;
 140                 }
 141                 if (nfsheur[hi].nh_use > 0)
 142                         --nfsheur[hi].nh_use;
 143                 hi = (hi + 1) % NUM_HEURISTIC;
 144                 if (nfsheur[hi].nh_use < nh->nh_use)
 145                         nh = &nfsheur[hi];
 146         }
 147
 148         /* Initialize hint if this is a new file. */
 149         if (nh->nh_vp != vp) {
 150                 nh->nh_vp = vp;
 151                 nh->nh_nextoff = uio->uio_offset;
 152                 nh->nh_use = NHUSE_INIT;
 153                 if (uio->uio_offset == 0)
 154                         nh->nh_seqcount = 4;
 155                 else
 156                         nh->nh_seqcount = 1;
 157         }
 158
 159         /* Calculate heuristic. */
 160         if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
 161             uio->uio_offset == nh->nh_nextoff) {
 162                 /* See comments in vfs_vnops.c:sequential_heuristic(). */
 163                 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
 164                 if (nh->nh_seqcount > IO_SEQMAX)
 165                         nh->nh_seqcount = IO_SEQMAX;
 166         } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
 167             imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
 168                 /* Probably a reordered RPC, leave seqcount alone. */
 169         } else if (nh->nh_seqcount > 1) {
 170                 nh->nh_seqcount /= 2;
 171         } else {
 172                 nh->nh_seqcount = 0;
 173         }
 174         nh->nh_use += NHUSE_INC;
 175         if (nh->nh_use > NHUSE_MAX)
 176                 nh->nh_use = NHUSE_MAX;
 177         return (nh);
 178 }
 179
 180 /*
 181  * Get attributes into nfsvattr structure.
 182  */
 183 int
 184 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 185     struct thread *p, int vpislocked)
 186 {
 187         int error, lockedit = 0;
 188
 189         if (vpislocked == 0) {
 190                 /*
 191                  * When vpislocked == 0, the vnode is either exclusively
 192                  * locked by this thread or not locked by this thread.
 193                  * As such, shared lock it, if not exclusively locked.
 194                  */
 195                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 196                         lockedit = 1;
 197                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 198                 }
 199         }
 200         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 201         if (lockedit != 0)
 202                 NFSVOPUNLOCK(vp, 0);
 203
 204         NFSEXITCODE(error);
 205         return (error);
 206 }
 207
 208 /*
 209  * Get a file handle for a vnode.
 210  */
 211 int
 212 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 213 {
 214         int error;
 215
 216         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 217         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 218         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 219
 220         NFSEXITCODE(error);
 221         return (error);
 222 }
 223
 224 /*
 225  * Perform access checking for vnodes obtained from file handles that would
 226  * refer to files already opened by a Unix client. You cannot just use
 227  * vn_writechk() and VOP_ACCESSX() for two reasons.
 228  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 229  *     case.
 230  * 2 - The owner is to be given access irrespective of mode bits for some
 231  *     operations, so that processes that chmod after opening a file don't
 232  *     break.
 233  */
 234 int
 235 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 236     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 237     u_int32_t *supportedtypep)
 238 {
 239         struct vattr vattr;
 240         int error = 0, getret = 0;
 241
 242         if (vpislocked == 0) {
 243                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 244                         error = EPERM;
 245                         goto out;
 246                 }
 247         }
 248         if (accmode & VWRITE) {
 249                 /* Just vn_writechk() changed to check rdonly */
 250                 /*
 251                  * Disallow write attempts on read-only file systems;
 252                  * unless the file is a socket or a block or character
 253                  * device resident on the file system.
 254                  */
 255                 if (NFSVNO_EXRDONLY(exp) ||
 256                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 257                         switch (vp->v_type) {
 258                         case VREG:
 259                         case VDIR:
 260                         case VLNK:
 261                                 error = EROFS;
 262                         default:
 263                                 break;
 264                         }
 265                 }
 266                 /*
 267                  * If there's shared text associated with
 268                  * the inode, try to free it up once.  If
 269                  * we fail, we can't allow writing.
 270                  */
 271                 if (VOP_IS_TEXT(vp) && error == 0)
 272                         error = ETXTBSY;
 273         }
 274         if (error != 0) {
 275                 if (vpislocked == 0)
 276                         NFSVOPUNLOCK(vp, 0);
 277                 goto out;
 278         }
 279
 280         /*
 281          * Should the override still be applied when ACLs are enabled?
 282          */
 283         error = VOP_ACCESSX(vp, accmode, cred, p);
 284         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 285                 /*
 286                  * Try again with VEXPLICIT_DENY, to see if the test for
 287                  * deletion is supported.
 288                  */
 289                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 290                 if (error == 0) {
 291                         if (vp->v_type == VDIR) {
 292                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 293                                 accmode |= VWRITE;
 294                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 295                         } else if (supportedtypep != NULL) {
 296                                 *supportedtypep &= ~NFSACCESS_DELETE;
 297                         }
 298                 }
 299         }
 300
 301         /*
 302          * Allow certain operations for the owner (reads and writes
 303          * on files that are already open).
 304          */
 305         if (override != NFSACCCHK_NOOVERRIDE &&
 306             (error == EPERM || error == EACCES)) {
 307                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 308                         error = 0;
 309                 else if (override & NFSACCCHK_ALLOWOWNER) {
 310                         getret = VOP_GETATTR(vp, &vattr, cred);
 311                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 312                                 error = 0;
 313                 }
 314         }
 315         if (vpislocked == 0)
 316                 NFSVOPUNLOCK(vp, 0);
 317
 318 out:
 319         NFSEXITCODE(error);
 320         return (error);
 321 }
 322
 323 /*
 324  * Set attribute(s) vnop.
 325  */
 326 int
 327 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 328     struct thread *p, struct nfsexstuff *exp)
 329 {
 330         int error;
 331
 332         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 333         NFSEXITCODE(error);
 334         return (error);
 335 }
 336
 337 /*
 338  * Set up nameidata for a lookup() call and do it.
 339  */
 340 int
 341 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 342     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 343     struct vnode **retdirp)
 344 {
 345         struct componentname *cnp = &ndp->ni_cnd;
 346         int i;
 347         struct iovec aiov;
 348         struct uio auio;
 349         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 350         int error = 0, crossmnt;
 351         char *cp;
 352
 353         *retdirp = NULL;
 354         cnp->cn_nameptr = cnp->cn_pnbuf;
 355         ndp->ni_lcf = 0;
 356         /*
 357          * Extract and set starting directory.
 358          */
 359         if (dp->v_type != VDIR) {
 360                 if (islocked)
 361                         vput(dp);
 362                 else
 363                         vrele(dp);
 364                 nfsvno_relpathbuf(ndp);
 365                 error = ENOTDIR;
 366                 goto out1;
 367         }
 368         if (islocked)
 369                 NFSVOPUNLOCK(dp, 0);
 370         VREF(dp);
 371         *retdirp = dp;
 372         if (NFSVNO_EXRDONLY(exp))
 373                 cnp->cn_flags |= RDONLY;
 374         ndp->ni_segflg = UIO_SYSSPACE;
 375         crossmnt = 1;
 376
 377         if (nd->nd_flag & ND_PUBLOOKUP) {
 378                 ndp->ni_loopcnt = 0;
 379                 if (cnp->cn_pnbuf[0] == '/') {
 380                         vrele(dp);
 381                         /*
 382                          * Check for degenerate pathnames here, since lookup()
 383                          * panics on them.
 384                          */
 385                         for (i = 1; i < ndp->ni_pathlen; i++)
 386                                 if (cnp->cn_pnbuf[i] != '/')
 387                                         break;
 388                         if (i == ndp->ni_pathlen) {
 389                                 error = NFSERR_ACCES;
 390                                 goto out;
 391                         }
 392                         dp = rootvnode;
 393                         VREF(dp);
 394                 }
 395         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 396             (nd->nd_flag & ND_NFSV4) == 0) {
 397                 /*
 398                  * Only cross mount points for NFSv4 when doing a
 399                  * mount while traversing the file system above
 400                  * the mount point, unless nfsrv_enable_crossmntpt is set.
 401                  */
 402                 cnp->cn_flags |= NOCROSSMOUNT;
 403                 crossmnt = 0;
 404         }
 405
 406         /*
 407          * Initialize for scan, set ni_startdir and bump ref on dp again
 408          * because lookup() will dereference ni_startdir.
 409          */
 410
 411         cnp->cn_thread = p;
 412         ndp->ni_startdir = dp;
 413         ndp->ni_rootdir = rootvnode;
 414         ndp->ni_topdir = NULL;
 415
 416         if (!lockleaf)
 417                 cnp->cn_flags |= LOCKLEAF;
 418         for (;;) {
 419                 cnp->cn_nameptr = cnp->cn_pnbuf;
 420                 /*
 421                  * Call lookup() to do the real work.  If an error occurs,
 422                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 423                  * we do not have to dereference anything before returning.
 424                  * In either case ni_startdir will be dereferenced and NULLed
 425                  * out.
 426                  */
 427                 error = lookup(ndp);
 428                 if (error)
 429                         break;
 430
 431                 /*
 432                  * Check for encountering a symbolic link.  Trivial
 433                  * termination occurs if no symlink encountered.
 434                  */
 435                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 436                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 437                                 nfsvno_relpathbuf(ndp);
 438                         if (ndp->ni_vp && !lockleaf)
 439                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
 440                         break;
 441                 }
 442
 443                 /*
 444                  * Validate symlink
 445                  */
 446                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 447                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
 448                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 449                         error = EINVAL;
 450                         goto badlink2;
 451                 }
 452
 453                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 454                         error = ELOOP;
 455                         goto badlink2;
 456                 }
 457                 if (ndp->ni_pathlen > 1)
 458                         cp = uma_zalloc(namei_zone, M_WAITOK);
 459                 else
 460                         cp = cnp->cn_pnbuf;
 461                 aiov.iov_base = cp;
 462                 aiov.iov_len = MAXPATHLEN;
 463                 auio.uio_iov = &aiov;
 464                 auio.uio_iovcnt = 1;
 465                 auio.uio_offset = 0;
 466                 auio.uio_rw = UIO_READ;
 467                 auio.uio_segflg = UIO_SYSSPACE;
 468                 auio.uio_td = NULL;
 469                 auio.uio_resid = MAXPATHLEN;
 470                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 471                 if (error) {
 472                 badlink1:
 473                         if (ndp->ni_pathlen > 1)
 474                                 uma_zfree(namei_zone, cp);
 475                 badlink2:
 476                         vrele(ndp->ni_dvp);
 477                         vput(ndp->ni_vp);
 478                         break;
 479                 }
 480                 linklen = MAXPATHLEN - auio.uio_resid;
 481                 if (linklen == 0) {
 482                         error = ENOENT;
 483                         goto badlink1;
 484                 }
 485                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 486                         error = ENAMETOOLONG;
 487                         goto badlink1;
 488                 }
 489
 490                 /*
 491                  * Adjust or replace path
 492                  */
 493                 if (ndp->ni_pathlen > 1) {
 494                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 495                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 496                         cnp->cn_pnbuf = cp;
 497                 } else
 498                         cnp->cn_pnbuf[linklen] = '\0';
 499                 ndp->ni_pathlen += linklen;
 500
 501                 /*
 502                  * Cleanup refs for next loop and check if root directory
 503                  * should replace current directory.  Normally ni_dvp
 504                  * becomes the new base directory and is cleaned up when
 505                  * we loop.  Explicitly null pointers after invalidation
 506                  * to clarify operation.
 507                  */
 508                 vput(ndp->ni_vp);
 509                 ndp->ni_vp = NULL;
 510
 511                 if (cnp->cn_pnbuf[0] == '/') {
 512                         vrele(ndp->ni_dvp);
 513                         ndp->ni_dvp = ndp->ni_rootdir;
 514                         VREF(ndp->ni_dvp);
 515                 }
 516                 ndp->ni_startdir = ndp->ni_dvp;
 517                 ndp->ni_dvp = NULL;
 518         }
 519         if (!lockleaf)
 520                 cnp->cn_flags &= ~LOCKLEAF;
 521
 522 out:
 523         if (error) {
 524                 nfsvno_relpathbuf(ndp);
 525                 ndp->ni_vp = NULL;
 526                 ndp->ni_dvp = NULL;
 527                 ndp->ni_startdir = NULL;
 528         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 529                 ndp->ni_dvp = NULL;
 530         }
 531
 532 out1:
 533         NFSEXITCODE2(error, nd);
 534         return (error);
 535 }
 536
 537 /*
 538  * Set up a pathname buffer and return a pointer to it and, optionally
 539  * set a hash pointer.
 540  */
 541 void
 542 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 543 {
 544         struct componentname *cnp = &ndp->ni_cnd;
 545
 546         cnp->cn_flags |= (NOMACCHECK | HASBUF);
 547         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 548         if (hashpp != NULL)
 549                 *hashpp = NULL;
 550         *bufpp = cnp->cn_pnbuf;
 551 }
 552
 553 /*
 554  * Release the above path buffer, if not released by nfsvno_namei().
 555  */
 556 void
 557 nfsvno_relpathbuf(struct nameidata *ndp)
 558 {
 559
 560         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 561                 panic("nfsrelpath");
 562         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 563         ndp->ni_cnd.cn_flags &= ~HASBUF;
 564 }
 565
 566 /*
 567  * Readlink vnode op into an mbuf list.
 568  */
 569 int
 570 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
 571     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 572 {
 573         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 574         struct iovec *ivp = iv;
 575         struct uio io, *uiop = &io;
 576         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 577         int i, len, tlen, error = 0;
 578
 579         len = 0;
 580         i = 0;
 581         while (len < NFS_MAXPATHLEN) {
 582                 NFSMGET(mp);
 583                 MCLGET(mp, M_WAITOK);
 584                 mp->m_len = M_SIZE(mp);
 585                 if (len == 0) {
 586                         mp3 = mp2 = mp;
 587                 } else {
 588                         mp2->m_next = mp;
 589                         mp2 = mp;
 590                 }
 591                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 592                         mp->m_len = NFS_MAXPATHLEN - len;
 593                         len = NFS_MAXPATHLEN;
 594                 } else {
 595                         len += mp->m_len;
 596                 }
 597                 ivp->iov_base = mtod(mp, caddr_t);
 598                 ivp->iov_len = mp->m_len;
 599                 i++;
 600                 ivp++;
 601         }
 602         uiop->uio_iov = iv;
 603         uiop->uio_iovcnt = i;
 604         uiop->uio_offset = 0;
 605         uiop->uio_resid = len;
 606         uiop->uio_rw = UIO_READ;
 607         uiop->uio_segflg = UIO_SYSSPACE;
 608         uiop->uio_td = NULL;
 609         error = VOP_READLINK(vp, uiop, cred);
 610         if (error) {
 611                 m_freem(mp3);
 612                 *lenp = 0;
 613                 goto out;
 614         }
 615         if (uiop->uio_resid > 0) {
 616                 len -= uiop->uio_resid;
 617                 tlen = NFSM_RNDUP(len);
 618                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 619         }
 620         *lenp = len;
 621         *mpp = mp3;
 622         *mpendp = mp;
 623
 624 out:
 625         NFSEXITCODE(error);
 626         return (error);
 627 }
 628
 629 /*
 630  * Read vnode op call into mbuf list.
 631  */
 632 int
 633 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
 634     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 635 {
 636         struct mbuf *m;
 637         int i;
 638         struct iovec *iv;
 639         struct iovec *iv2;
 640         int error = 0, len, left, siz, tlen, ioflag = 0;
 641         struct mbuf *m2 = NULL, *m3;
 642         struct uio io, *uiop = &io;
 643         struct nfsheur *nh;
 644
 645         len = left = NFSM_RNDUP(cnt);
 646         m3 = NULL;
 647         /*
 648          * Generate the mbuf list with the uio_iov ref. to it.
 649          */
 650         i = 0;
 651         while (left > 0) {
 652                 NFSMGET(m);
 653                 MCLGET(m, M_WAITOK);
 654                 m->m_len = 0;
 655                 siz = min(M_TRAILINGSPACE(m), left);
 656                 left -= siz;
 657                 i++;
 658                 if (m3)
 659                         m2->m_next = m;
 660                 else
 661                         m3 = m;
 662                 m2 = m;
 663         }
 664         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 665             M_TEMP, M_WAITOK);
 666         uiop->uio_iov = iv2 = iv;
 667         m = m3;
 668         left = len;
 669         i = 0;
 670         while (left > 0) {
 671                 if (m == NULL)
 672                         panic("nfsvno_read iov");
 673                 siz = min(M_TRAILINGSPACE(m), left);
 674                 if (siz > 0) {
 675                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
 676                         iv->iov_len = siz;
 677                         m->m_len += siz;
 678                         left -= siz;
 679                         iv++;
 680                         i++;
 681                 }
 682                 m = m->m_next;
 683         }
 684         uiop->uio_iovcnt = i;
 685         uiop->uio_offset = off;
 686         uiop->uio_resid = len;
 687         uiop->uio_rw = UIO_READ;
 688         uiop->uio_segflg = UIO_SYSSPACE;
 689         uiop->uio_td = NULL;
 690         nh = nfsrv_sequential_heuristic(uiop, vp);
 691         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 692         /* XXX KDM make this more systematic? */
 693         nfsstatsv1.srvbytes[NFSV4OP_READ] += uiop->uio_resid;
 694         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 695         FREE((caddr_t)iv2, M_TEMP);
 696         if (error) {
 697                 m_freem(m3);
 698                 *mpp = NULL;
 699                 goto out;
 700         }
 701         nh->nh_nextoff = uiop->uio_offset;
 702         tlen = len - uiop->uio_resid;
 703         cnt = cnt < tlen ? cnt : tlen;
 704         tlen = NFSM_RNDUP(cnt);
 705         if (tlen == 0) {
 706                 m_freem(m3);
 707                 m3 = NULL;
 708         } else if (len != tlen || tlen != cnt)
 709                 nfsrv_adj(m3, len - tlen, tlen - cnt);
 710         *mpp = m3;
 711         *mpendp = m2;
 712
 713 out:
 714         NFSEXITCODE(error);
 715         return (error);
 716 }
 717
 718 /*
 719  * Write vnode op from an mbuf list.
 720  */
 721 int
 722 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
 723     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 724 {
 725         struct iovec *ivp;
 726         int i, len;
 727         struct iovec *iv;
 728         int ioflags, error;
 729         struct uio io, *uiop = &io;
 730         struct nfsheur *nh;
 731
 732         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 733             M_WAITOK);
 734         uiop->uio_iov = iv = ivp;
 735         uiop->uio_iovcnt = cnt;
 736         i = mtod(mp, caddr_t) + mp->m_len - cp;
 737         len = retlen;
 738         while (len > 0) {
 739                 if (mp == NULL)
 740                         panic("nfsvno_write");
 741                 if (i > 0) {
 742                         i = min(i, len);
 743                         ivp->iov_base = cp;
 744                         ivp->iov_len = i;
 745                         ivp++;
 746                         len -= i;
 747                 }
 748                 mp = mp->m_next;
 749                 if (mp) {
 750                         i = mp->m_len;
 751                         cp = mtod(mp, caddr_t);
 752                 }
 753         }
 754
 755         if (stable == NFSWRITE_UNSTABLE)
 756                 ioflags = IO_NODELOCKED;
 757         else
 758                 ioflags = (IO_SYNC | IO_NODELOCKED);
 759         uiop->uio_resid = retlen;
 760         uiop->uio_rw = UIO_WRITE;
 761         uiop->uio_segflg = UIO_SYSSPACE;
 762         NFSUIOPROC(uiop, p);
 763         uiop->uio_offset = off;
 764         nh = nfsrv_sequential_heuristic(uiop, vp);
 765         ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
 766         /* XXX KDM make this more systematic? */
 767         nfsstatsv1.srvbytes[NFSV4OP_WRITE] += uiop->uio_resid;
 768         error = VOP_WRITE(vp, uiop, ioflags, cred);
 769         if (error == 0)
 770                 nh->nh_nextoff = uiop->uio_offset;
 771         FREE((caddr_t)iv, M_TEMP);
 772
 773         NFSEXITCODE(error);
 774         return (error);
 775 }
 776
 777 /*
 778  * Common code for creating a regular file (plus special files for V2).
 779  */
 780 int
 781 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
 782     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
 783     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 784 {
 785         u_quad_t tempsize;
 786         int error;
 787
 788         error = nd->nd_repstat;
 789         if (!error && ndp->ni_vp == NULL) {
 790                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 791                         vrele(ndp->ni_startdir);
 792                         error = VOP_CREATE(ndp->ni_dvp,
 793                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 794                         vput(ndp->ni_dvp);
 795                         nfsvno_relpathbuf(ndp);
 796                         if (!error) {
 797                                 if (*exclusive_flagp) {
 798                                         *exclusive_flagp = 0;
 799                                         NFSVNO_ATTRINIT(nvap);
 800                                         nvap->na_atime.tv_sec = cverf[0];
 801                                         nvap->na_atime.tv_nsec = cverf[1];
 802                                         error = VOP_SETATTR(ndp->ni_vp,
 803                                             &nvap->na_vattr, nd->nd_cred);
 804                                         if (error != 0) {
 805                                                 vput(ndp->ni_vp);
 806                                                 ndp->ni_vp = NULL;
 807                                                 error = NFSERR_NOTSUPP;
 808                                         }
 809                                 }
 810                         }
 811                 /*
 812                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
 813                  * (This implies, just get out on an error.)
 814                  */
 815                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 816                         nvap->na_type == VFIFO) {
 817                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
 818                                 nvap->na_type = VFIFO;
 819                         if (nvap->na_type != VFIFO &&
 820                             (error = priv_check_cred(nd->nd_cred,
 821                              PRIV_VFS_MKNOD_DEV, 0))) {
 822                                 vrele(ndp->ni_startdir);
 823                                 nfsvno_relpathbuf(ndp);
 824                                 vput(ndp->ni_dvp);
 825                                 goto out;
 826                         }
 827                         nvap->na_rdev = rdev;
 828                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 829                             &ndp->ni_cnd, &nvap->na_vattr);
 830                         vput(ndp->ni_dvp);
 831                         nfsvno_relpathbuf(ndp);
 832                         vrele(ndp->ni_startdir);
 833                         if (error)
 834                                 goto out;
 835                 } else {
 836                         vrele(ndp->ni_startdir);
 837                         nfsvno_relpathbuf(ndp);
 838                         vput(ndp->ni_dvp);
 839                         error = ENXIO;
 840                         goto out;
 841                 }
 842                 *vpp = ndp->ni_vp;
 843         } else {
 844                 /*
 845                  * Handle cases where error is already set and/or
 846                  * the file exists.
 847                  * 1 - clean up the lookup
 848                  * 2 - iff !error and na_size set, truncate it
 849                  */
 850                 vrele(ndp->ni_startdir);
 851                 nfsvno_relpathbuf(ndp);
 852                 *vpp = ndp->ni_vp;
 853                 if (ndp->ni_dvp == *vpp)
 854                         vrele(ndp->ni_dvp);
 855                 else
 856                         vput(ndp->ni_dvp);
 857                 if (!error && nvap->na_size != VNOVAL) {
 858                         error = nfsvno_accchk(*vpp, VWRITE,
 859                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 860                             NFSACCCHK_VPISLOCKED, NULL);
 861                         if (!error) {
 862                                 tempsize = nvap->na_size;
 863                                 NFSVNO_ATTRINIT(nvap);
 864                                 nvap->na_size = tempsize;
 865                                 error = VOP_SETATTR(*vpp,
 866                                     &nvap->na_vattr, nd->nd_cred);
 867                         }
 868                 }
 869                 if (error)
 870                         vput(*vpp);
 871         }
 872
 873 out:
 874         NFSEXITCODE(error);
 875         return (error);
 876 }
 877
 878 /*
 879  * Do a mknod vnode op.
 880  */
 881 int
 882 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
 883     struct thread *p)
 884 {
 885         int error = 0;
 886         enum vtype vtyp;
 887
 888         vtyp = nvap->na_type;
 889         /*
 890          * Iff doesn't exist, create it.
 891          */
 892         if (ndp->ni_vp) {
 893                 vrele(ndp->ni_startdir);
 894                 nfsvno_relpathbuf(ndp);
 895                 vput(ndp->ni_dvp);
 896                 vrele(ndp->ni_vp);
 897                 error = EEXIST;
 898                 goto out;
 899         }
 900         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 901                 vrele(ndp->ni_startdir);
 902                 nfsvno_relpathbuf(ndp);
 903                 vput(ndp->ni_dvp);
 904                 error = NFSERR_BADTYPE;
 905                 goto out;
 906         }
 907         if (vtyp == VSOCK) {
 908                 vrele(ndp->ni_startdir);
 909                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 910                     &ndp->ni_cnd, &nvap->na_vattr);
 911                 vput(ndp->ni_dvp);
 912                 nfsvno_relpathbuf(ndp);
 913         } else {
 914                 if (nvap->na_type != VFIFO &&
 915                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 916                         vrele(ndp->ni_startdir);
 917                         nfsvno_relpathbuf(ndp);
 918                         vput(ndp->ni_dvp);
 919                         goto out;
 920                 }
 921                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 922                     &ndp->ni_cnd, &nvap->na_vattr);
 923                 vput(ndp->ni_dvp);
 924                 nfsvno_relpathbuf(ndp);
 925                 vrele(ndp->ni_startdir);
 926                 /*
 927                  * Since VOP_MKNOD returns the ni_vp, I can't
 928                  * see any reason to do the lookup.
 929                  */
 930         }
 931
 932 out:
 933         NFSEXITCODE(error);
 934         return (error);
 935 }
 936
 937 /*
 938  * Mkdir vnode op.
 939  */
 940 int
 941 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
 942     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 943 {
 944         int error = 0;
 945
 946         if (ndp->ni_vp != NULL) {
 947                 if (ndp->ni_dvp == ndp->ni_vp)
 948                         vrele(ndp->ni_dvp);
 949                 else
 950                         vput(ndp->ni_dvp);
 951                 vrele(ndp->ni_vp);
 952                 nfsvno_relpathbuf(ndp);
 953                 error = EEXIST;
 954                 goto out;
 955         }
 956         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 957             &nvap->na_vattr);
 958         vput(ndp->ni_dvp);
 959         nfsvno_relpathbuf(ndp);
 960
 961 out:
 962         NFSEXITCODE(error);
 963         return (error);
 964 }
 965
 966 /*
 967  * symlink vnode op.
 968  */
 969 int
 970 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
 971     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
 972     struct nfsexstuff *exp)
 973 {
 974         int error = 0;
 975
 976         if (ndp->ni_vp) {
 977                 vrele(ndp->ni_startdir);
 978                 nfsvno_relpathbuf(ndp);
 979                 if (ndp->ni_dvp == ndp->ni_vp)
 980                         vrele(ndp->ni_dvp);
 981                 else
 982                         vput(ndp->ni_dvp);
 983                 vrele(ndp->ni_vp);
 984                 error = EEXIST;
 985                 goto out;
 986         }
 987
 988         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 989             &nvap->na_vattr, pathcp);
 990         vput(ndp->ni_dvp);
 991         vrele(ndp->ni_startdir);
 992         nfsvno_relpathbuf(ndp);
 993         /*
 994          * Although FreeBSD still had the lookup code in
 995          * it for 7/current, there doesn't seem to be any
 996          * point, since VOP_SYMLINK() returns the ni_vp.
 997          * Just vput it for v2.
 998          */
 999         if (!not_v2 && !error)
1000                 vput(ndp->ni_vp);
1001
1002 out:
1003         NFSEXITCODE(error);
1004         return (error);
1005 }
1006
1007 /*
1008  * Parse symbolic link arguments.
1009  * This function has an ugly side effect. It will MALLOC() an area for
1010  * the symlink and set iov_base to point to it, only if it succeeds.
1011  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
1012  * be FREE'd later.
1013  */
1014 int
1015 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
1016     struct thread *p, char **pathcpp, int *lenp)
1017 {
1018         u_int32_t *tl;
1019         char *pathcp = NULL;
1020         int error = 0, len;
1021         struct nfsv2_sattr *sp;
1022
1023         *pathcpp = NULL;
1024         *lenp = 0;
1025         if ((nd->nd_flag & ND_NFSV3) &&
1026             (error = nfsrv_sattr(nd, NULL, nvap, NULL, NULL, p)))
1027                 goto nfsmout;
1028         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
1029         len = fxdr_unsigned(int, *tl);
1030         if (len > NFS_MAXPATHLEN || len <= 0) {
1031                 error = EBADRPC;
1032                 goto nfsmout;
1033         }
1034         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
1035         error = nfsrv_mtostr(nd, pathcp, len);
1036         if (error)
1037                 goto nfsmout;
1038         if (nd->nd_flag & ND_NFSV2) {
1039                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
1040                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
1041         }
1042         *pathcpp = pathcp;
1043         *lenp = len;
1044         NFSEXITCODE2(0, nd);
1045         return (0);
1046 nfsmout:
1047         if (pathcp)
1048                 free(pathcp, M_TEMP);
1049         NFSEXITCODE2(error, nd);
1050         return (error);
1051 }
1052
1053 /*
1054  * Remove a non-directory object.
1055  */
1056 int
1057 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1058     struct thread *p, struct nfsexstuff *exp)
1059 {
1060         struct vnode *vp;
1061         int error = 0;
1062
1063         vp = ndp->ni_vp;
1064         if (vp->v_type == VDIR)
1065                 error = NFSERR_ISDIR;
1066         else if (is_v4)
1067                 error = nfsrv_checkremove(vp, 1, p);
1068         if (!error)
1069                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
1070         if (ndp->ni_dvp == vp)
1071                 vrele(ndp->ni_dvp);
1072         else
1073                 vput(ndp->ni_dvp);
1074         vput(vp);
1075         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1076                 nfsvno_relpathbuf(ndp);
1077         NFSEXITCODE(error);
1078         return (error);
1079 }
1080
1081 /*
1082  * Remove a directory.
1083  */
1084 int
1085 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1086     struct thread *p, struct nfsexstuff *exp)
1087 {
1088         struct vnode *vp;
1089         int error = 0;
1090
1091         vp = ndp->ni_vp;
1092         if (vp->v_type != VDIR) {
1093                 error = ENOTDIR;
1094                 goto out;
1095         }
1096         /*
1097          * No rmdir "." please.
1098          */
1099         if (ndp->ni_dvp == vp) {
1100                 error = EINVAL;
1101                 goto out;
1102         }
1103         /*
1104          * The root of a mounted filesystem cannot be deleted.
1105          */
1106         if (vp->v_vflag & VV_ROOT)
1107                 error = EBUSY;
1108 out:
1109         if (!error)
1110                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1111         if (ndp->ni_dvp == vp)
1112                 vrele(ndp->ni_dvp);
1113         else
1114                 vput(ndp->ni_dvp);
1115         vput(vp);
1116         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1117                 nfsvno_relpathbuf(ndp);
1118         NFSEXITCODE(error);
1119         return (error);
1120 }
1121
1122 /*
1123  * Rename vnode op.
1124  */
1125 int
1126 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1127     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1128 {
1129         struct vnode *fvp, *tvp, *tdvp;
1130         int error = 0;
1131
1132         fvp = fromndp->ni_vp;
1133         if (ndstat) {
1134                 vrele(fromndp->ni_dvp);
1135                 vrele(fvp);
1136                 error = ndstat;
1137                 goto out1;
1138         }
1139         tdvp = tondp->ni_dvp;
1140         tvp = tondp->ni_vp;
1141         if (tvp != NULL) {
1142                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1143                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1144                         goto out;
1145                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1146                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1147                         goto out;
1148                 }
1149                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1150                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1151                         goto out;
1152                 }
1153
1154                 /*
1155                  * A rename to '.' or '..' results in a prematurely
1156                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
1157                  * here.
1158                  */
1159                 if ((tondp->ni_cnd.cn_namelen == 1 &&
1160                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
1161                     (tondp->ni_cnd.cn_namelen == 2 &&
1162                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
1163                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
1164                         error = EINVAL;
1165                         goto out;
1166                 }
1167         }
1168         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1169                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1170                 goto out;
1171         }
1172         if (fvp->v_mount != tdvp->v_mount) {
1173                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1174                 goto out;
1175         }
1176         if (fvp == tdvp) {
1177                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1178                 goto out;
1179         }
1180         if (fvp == tvp) {
1181                 /*
1182                  * If source and destination are the same, there is nothing to
1183                  * do. Set error to -1 to indicate this.
1184                  */
1185                 error = -1;
1186                 goto out;
1187         }
1188         if (ndflag & ND_NFSV4) {
1189                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
1190                         error = nfsrv_checkremove(fvp, 0, p);
1191                         NFSVOPUNLOCK(fvp, 0);
1192                 } else
1193                         error = EPERM;
1194                 if (tvp && !error)
1195                         error = nfsrv_checkremove(tvp, 1, p);
1196         } else {
1197                 /*
1198                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
1199                  * that the NFSv4 client won't be confused by the rename.
1200                  * Since nfsd_recalldelegation() can only be called on an
1201                  * unlocked vnode at this point and fvp is the file that will
1202                  * still exist after the rename, just do fvp.
1203                  */
1204                 nfsd_recalldelegation(fvp, p);
1205         }
1206 out:
1207         if (!error) {
1208                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1209                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1210                     &tondp->ni_cnd);
1211         } else {
1212                 if (tdvp == tvp)
1213                         vrele(tdvp);
1214                 else
1215                         vput(tdvp);
1216                 if (tvp)
1217                         vput(tvp);
1218                 vrele(fromndp->ni_dvp);
1219                 vrele(fvp);
1220                 if (error == -1)
1221                         error = 0;
1222         }
1223         vrele(tondp->ni_startdir);
1224         nfsvno_relpathbuf(tondp);
1225 out1:
1226         vrele(fromndp->ni_startdir);
1227         nfsvno_relpathbuf(fromndp);
1228         NFSEXITCODE(error);
1229         return (error);
1230 }
1231
1232 /*
1233  * Link vnode op.
1234  */
1235 int
1236 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1237     struct thread *p, struct nfsexstuff *exp)
1238 {
1239         struct vnode *xp;
1240         int error = 0;
1241
1242         xp = ndp->ni_vp;
1243         if (xp != NULL) {
1244                 error = EEXIST;
1245         } else {
1246                 xp = ndp->ni_dvp;
1247                 if (vp->v_mount != xp->v_mount)
1248                         error = EXDEV;
1249         }
1250         if (!error) {
1251                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1252                 if ((vp->v_iflag & VI_DOOMED) == 0)
1253                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1254                 else
1255                         error = EPERM;
1256                 if (ndp->ni_dvp == vp)
1257                         vrele(ndp->ni_dvp);
1258                 else
1259                         vput(ndp->ni_dvp);
1260                 NFSVOPUNLOCK(vp, 0);
1261         } else {
1262                 if (ndp->ni_dvp == ndp->ni_vp)
1263                         vrele(ndp->ni_dvp);
1264                 else
1265                         vput(ndp->ni_dvp);
1266                 if (ndp->ni_vp)
1267                         vrele(ndp->ni_vp);
1268         }
1269         nfsvno_relpathbuf(ndp);
1270         NFSEXITCODE(error);
1271         return (error);
1272 }
1273
1274 /*
1275  * Do the fsync() appropriate for the commit.
1276  */
1277 int
1278 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1279     struct thread *td)
1280 {
1281         int error = 0;
1282
1283         /*
1284          * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
1285          * file is done.  At this time VOP_FSYNC does not accept offset and
1286          * byte count parameters so call VOP_FSYNC the whole file for now.
1287          * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
1288          * File systems that do not use the buffer cache (as indicated
1289          * by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
1290          */
1291         if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
1292             (vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
1293                 /*
1294                  * Give up and do the whole thing
1295                  */
1296                 if (vp->v_object &&
1297                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1298                         VM_OBJECT_WLOCK(vp->v_object);
1299                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1300                         VM_OBJECT_WUNLOCK(vp->v_object);
1301                 }
1302                 error = VOP_FSYNC(vp, MNT_WAIT, td);
1303         } else {
1304                 /*
1305                  * Locate and synchronously write any buffers that fall
1306                  * into the requested range.  Note:  we are assuming that
1307                  * f_iosize is a power of 2.
1308                  */
1309                 int iosize = vp->v_mount->mnt_stat.f_iosize;
1310                 int iomask = iosize - 1;
1311                 struct bufobj *bo;
1312                 daddr_t lblkno;
1313
1314                 /*
1315                  * Align to iosize boundary, super-align to page boundary.
1316                  */
1317                 if (off & iomask) {
1318                         cnt += off & iomask;
1319                         off &= ~(u_quad_t)iomask;
1320                 }
1321                 if (off & PAGE_MASK) {
1322                         cnt += off & PAGE_MASK;
1323                         off &= ~(u_quad_t)PAGE_MASK;
1324                 }
1325                 lblkno = off / iosize;
1326
1327                 if (vp->v_object &&
1328                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1329                         VM_OBJECT_WLOCK(vp->v_object);
1330                         vm_object_page_clean(vp->v_object, off, off + cnt,
1331                             OBJPC_SYNC);
1332                         VM_OBJECT_WUNLOCK(vp->v_object);
1333                 }
1334
1335                 bo = &vp->v_bufobj;
1336                 BO_LOCK(bo);
1337                 while (cnt > 0) {
1338                         struct buf *bp;
1339
1340                         /*
1341                          * If we have a buffer and it is marked B_DELWRI we
1342                          * have to lock and write it.  Otherwise the prior
1343                          * write is assumed to have already been committed.
1344                          *
1345                          * gbincore() can return invalid buffers now so we
1346                          * have to check that bit as well (though B_DELWRI
1347                          * should not be set if B_INVAL is set there could be
1348                          * a race here since we haven't locked the buffer).
1349                          */
1350                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1351                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1352                                     LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
1353                                         BO_LOCK(bo);
1354                                         continue; /* retry */
1355                                 }
1356                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1357                                     B_DELWRI) {
1358                                         bremfree(bp);
1359                                         bp->b_flags &= ~B_ASYNC;
1360                                         bwrite(bp);
1361                                         ++nfs_commit_miss;
1362                                 } else
1363                                         BUF_UNLOCK(bp);
1364                                 BO_LOCK(bo);
1365                         }
1366                         ++nfs_commit_blks;
1367                         if (cnt < iosize)
1368                                 break;
1369                         cnt -= iosize;
1370                         ++lblkno;
1371                 }
1372                 BO_UNLOCK(bo);
1373         }
1374         NFSEXITCODE(error);
1375         return (error);
1376 }
1377
1378 /*
1379  * Statfs vnode op.
1380  */
1381 int
1382 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1383 {
1384         int error;
1385
1386         error = VFS_STATFS(vp->v_mount, sf);
1387         if (error == 0) {
1388                 /*
1389                  * Since NFS handles these values as unsigned on the
1390                  * wire, there is no way to represent negative values,
1391                  * so set them to 0. Without this, they will appear
1392                  * to be very large positive values for clients like
1393                  * Solaris10.
1394                  */
1395                 if (sf->f_bavail < 0)
1396                         sf->f_bavail = 0;
1397                 if (sf->f_ffree < 0)
1398                         sf->f_ffree = 0;
1399         }
1400         NFSEXITCODE(error);
1401         return (error);
1402 }
1403
1404 /*
1405  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1406  * must handle nfsrv_opencheck() calls after any other access checks.
1407  */
1408 void
1409 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1410     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1411     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1412     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1413     struct nfsexstuff *exp, struct vnode **vpp)
1414 {
1415         struct vnode *vp = NULL;
1416         u_quad_t tempsize;
1417         struct nfsexstuff nes;
1418
1419         if (ndp->ni_vp == NULL)
1420                 nd->nd_repstat = nfsrv_opencheck(clientid,
1421                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
1422         if (!nd->nd_repstat) {
1423                 if (ndp->ni_vp == NULL) {
1424                         vrele(ndp->ni_startdir);
1425                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1426                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1427                         vput(ndp->ni_dvp);
1428                         nfsvno_relpathbuf(ndp);
1429                         if (!nd->nd_repstat) {
1430                                 if (*exclusive_flagp) {
1431                                         *exclusive_flagp = 0;
1432                                         NFSVNO_ATTRINIT(nvap);
1433                                         nvap->na_atime.tv_sec = cverf[0];
1434                                         nvap->na_atime.tv_nsec = cverf[1];
1435                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1436                                             &nvap->na_vattr, cred);
1437                                         if (nd->nd_repstat != 0) {
1438                                                 vput(ndp->ni_vp);
1439                                                 ndp->ni_vp = NULL;
1440                                                 nd->nd_repstat = NFSERR_NOTSUPP;
1441                                         } else
1442                                                 NFSSETBIT_ATTRBIT(attrbitp,
1443                                                     NFSATTRBIT_TIMEACCESS);
1444                                 } else {
1445                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1446                                             aclp, p, attrbitp, exp);
1447                                 }
1448                         }
1449                         vp = ndp->ni_vp;
1450                 } else {
1451                         if (ndp->ni_startdir)
1452                                 vrele(ndp->ni_startdir);
1453                         nfsvno_relpathbuf(ndp);
1454                         vp = ndp->ni_vp;
1455                         if (create == NFSV4OPEN_CREATE) {
1456                                 if (ndp->ni_dvp == vp)
1457                                         vrele(ndp->ni_dvp);
1458                                 else
1459                                         vput(ndp->ni_dvp);
1460                         }
1461                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1462                                 if (ndp->ni_cnd.cn_flags & RDONLY)
1463                                         NFSVNO_SETEXRDONLY(&nes);
1464                                 else
1465                                         NFSVNO_EXINIT(&nes);
1466                                 nd->nd_repstat = nfsvno_accchk(vp,
1467                                     VWRITE, cred, &nes, p,
1468                                     NFSACCCHK_NOOVERRIDE,
1469                                     NFSACCCHK_VPISLOCKED, NULL);
1470                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1471                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1472                                 if (!nd->nd_repstat) {
1473                                         tempsize = nvap->na_size;
1474                                         NFSVNO_ATTRINIT(nvap);
1475                                         nvap->na_size = tempsize;
1476                                         nd->nd_repstat = VOP_SETATTR(vp,
1477                                             &nvap->na_vattr, cred);
1478                                 }
1479                         } else if (vp->v_type == VREG) {
1480                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1481                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1482                         }
1483                 }
1484         } else {
1485                 if (ndp->ni_cnd.cn_flags & HASBUF)
1486                         nfsvno_relpathbuf(ndp);
1487                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1488                         vrele(ndp->ni_startdir);
1489                         if (ndp->ni_dvp == ndp->ni_vp)
1490                                 vrele(ndp->ni_dvp);
1491                         else
1492                                 vput(ndp->ni_dvp);
1493                         if (ndp->ni_vp)
1494                                 vput(ndp->ni_vp);
1495                 }
1496         }
1497         *vpp = vp;
1498
1499         NFSEXITCODE2(0, nd);
1500 }
1501
1502 /*
1503  * Updates the file rev and sets the mtime and ctime
1504  * to the current clock time, returning the va_filerev and va_Xtime
1505  * values.
1506  * Return ESTALE to indicate the vnode is VI_DOOMED.
1507  */
1508 int
1509 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1510     struct ucred *cred, struct thread *p)
1511 {
1512         struct vattr va;
1513
1514         VATTR_NULL(&va);
1515         vfs_timestamp(&va.va_mtime);
1516         if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
1517                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
1518                 if ((vp->v_iflag & VI_DOOMED) != 0)
1519                         return (ESTALE);
1520         }
1521         (void) VOP_SETATTR(vp, &va, cred);
1522         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
1523         return (0);
1524 }
1525
1526 /*
1527  * Glue routine to nfsv4_fillattr().
1528  */
1529 int
1530 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
1531     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1532     struct ucred *cred, struct thread *p, int isdgram, int reterr,
1533     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
1534 {
1535         int error;
1536
1537         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
1538             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
1539             mounted_on_fileno);
1540         NFSEXITCODE2(0, nd);
1541         return (error);
1542 }
1543
1544 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1545 /*
1546  * nfs readdir service
1547  * - mallocs what it thinks is enough to read
1548  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1549  * - calls VOP_READDIR()
1550  * - loops around building the reply
1551  *      if the output generated exceeds count break out of loop
1552  *      The NFSM_CLGET macro is used here so that the reply will be packed
1553  *      tightly in mbuf clusters.
1554  * - it trims out records with d_fileno == 0
1555  *      this doesn't matter for Unix clients, but they might confuse clients
1556  *      for other os'.
1557  * - it trims out records with d_type == DT_WHT
1558  *      these cannot be seen through NFS (unless we extend the protocol)
1559  *     The alternate call nfsrvd_readdirplus() does lookups as well.
1560  * PS: The NFS protocol spec. does not clarify what the "count" byte
1561  *      argument is a count of.. just name strings and file id's or the
1562  *      entire reply rpc or ...
1563  *      I tried just file name and id sizes and it confused the Sun client,
1564  *      so I am using the full rpc size now. The "paranoia.." comment refers
1565  *      to including the status longwords that are not a part of the dir.
1566  *      "entry" structures, but are in the rpc.
1567  */
1568 int
1569 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1570     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1571 {
1572         struct dirent *dp;
1573         u_int32_t *tl;
1574         int dirlen;
1575         char *cpos, *cend, *rbuf;
1576         struct nfsvattr at;
1577         int nlen, error = 0, getret = 1;
1578         int siz, cnt, fullsiz, eofflag, ncookies;
1579         u_int64_t off, toff, verf;
1580         u_long *cookies = NULL, *cookiep;
1581         struct uio io;
1582         struct iovec iv;
1583         int is_ufs;
1584
1585         if (nd->nd_repstat) {
1586                 nfsrv_postopattr(nd, getret, &at);
1587                 goto out;
1588         }
1589         if (nd->nd_flag & ND_NFSV2) {
1590                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1591                 off = fxdr_unsigned(u_quad_t, *tl++);
1592         } else {
1593                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1594                 off = fxdr_hyper(tl);
1595                 tl += 2;
1596                 verf = fxdr_hyper(tl);
1597                 tl += 2;
1598         }
1599         toff = off;
1600         cnt = fxdr_unsigned(int, *tl);
1601         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1602                 cnt = NFS_SRVMAXDATA(nd);
1603         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1604         fullsiz = siz;
1605         if (nd->nd_flag & ND_NFSV3) {
1606                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1607                     p, 1);
1608 #if 0
1609                 /*
1610                  * va_filerev is not sufficient as a cookie verifier,
1611                  * since it is not supposed to change when entries are
1612                  * removed/added unless that offset cookies returned to
1613                  * the client are no longer valid.
1614                  */
1615                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1616                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1617 #endif
1618         }
1619         if (!nd->nd_repstat && vp->v_type != VDIR)
1620                 nd->nd_repstat = NFSERR_NOTDIR;
1621         if (nd->nd_repstat == 0 && cnt == 0) {
1622                 if (nd->nd_flag & ND_NFSV2)
1623                         /* NFSv2 does not have NFSERR_TOOSMALL */
1624                         nd->nd_repstat = EPERM;
1625                 else
1626                         nd->nd_repstat = NFSERR_TOOSMALL;
1627         }
1628         if (!nd->nd_repstat)
1629                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1630                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1631                     NFSACCCHK_VPISLOCKED, NULL);
1632         if (nd->nd_repstat) {
1633                 vput(vp);
1634                 if (nd->nd_flag & ND_NFSV3)
1635                         nfsrv_postopattr(nd, getret, &at);
1636                 goto out;
1637         }
1638         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1639         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1640 again:
1641         eofflag = 0;
1642         if (cookies) {
1643                 free((caddr_t)cookies, M_TEMP);
1644                 cookies = NULL;
1645         }
1646
1647         iv.iov_base = rbuf;
1648         iv.iov_len = siz;
1649         io.uio_iov = &iv;
1650         io.uio_iovcnt = 1;
1651         io.uio_offset = (off_t)off;
1652         io.uio_resid = siz;
1653         io.uio_segflg = UIO_SYSSPACE;
1654         io.uio_rw = UIO_READ;
1655         io.uio_td = NULL;
1656         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1657             &cookies);
1658         off = (u_int64_t)io.uio_offset;
1659         if (io.uio_resid)
1660                 siz -= io.uio_resid;
1661
1662         if (!cookies && !nd->nd_repstat)
1663                 nd->nd_repstat = NFSERR_PERM;
1664         if (nd->nd_flag & ND_NFSV3) {
1665                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1666                 if (!nd->nd_repstat)
1667                         nd->nd_repstat = getret;
1668         }
1669
1670         /*
1671          * Handles the failed cases. nd->nd_repstat == 0 past here.
1672          */
1673         if (nd->nd_repstat) {
1674                 vput(vp);
1675                 free((caddr_t)rbuf, M_TEMP);
1676                 if (cookies)
1677                         free((caddr_t)cookies, M_TEMP);
1678                 if (nd->nd_flag & ND_NFSV3)
1679                         nfsrv_postopattr(nd, getret, &at);
1680                 goto out;
1681         }
1682         /*
1683          * If nothing read, return eof
1684          * rpc reply
1685          */
1686         if (siz == 0) {
1687                 vput(vp);
1688                 if (nd->nd_flag & ND_NFSV2) {
1689                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1690                 } else {
1691                         nfsrv_postopattr(nd, getret, &at);
1692                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1693                         txdr_hyper(at.na_filerev, tl);
1694                         tl += 2;
1695                 }
1696                 *tl++ = newnfs_false;
1697                 *tl = newnfs_true;
1698                 FREE((caddr_t)rbuf, M_TEMP);
1699                 FREE((caddr_t)cookies, M_TEMP);
1700                 goto out;
1701         }
1702
1703         /*
1704          * Check for degenerate cases of nothing useful read.
1705          * If so go try again
1706          */
1707         cpos = rbuf;
1708         cend = rbuf + siz;
1709         dp = (struct dirent *)cpos;
1710         cookiep = cookies;
1711
1712         /*
1713          * For some reason FreeBSD's ufs_readdir() chooses to back the
1714          * directory offset up to a block boundary, so it is necessary to
1715          * skip over the records that precede the requested offset. This
1716          * requires the assumption that file offset cookies monotonically
1717          * increase.
1718          */
1719         while (cpos < cend && ncookies > 0 &&
1720             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1721              (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
1722                 cpos += dp->d_reclen;
1723                 dp = (struct dirent *)cpos;
1724                 cookiep++;
1725                 ncookies--;
1726         }
1727         if (cpos >= cend || ncookies == 0) {
1728                 siz = fullsiz;
1729                 toff = off;
1730                 goto again;
1731         }
1732         vput(vp);
1733
1734         /*
1735          * dirlen is the size of the reply, including all XDR and must
1736          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1737          * if the XDR should be included in "count", but to be safe, we do.
1738          * (Include the two booleans at the end of the reply in dirlen now.)
1739          */
1740         if (nd->nd_flag & ND_NFSV3) {
1741                 nfsrv_postopattr(nd, getret, &at);
1742                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1743                 txdr_hyper(at.na_filerev, tl);
1744                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1745         } else {
1746                 dirlen = 2 * NFSX_UNSIGNED;
1747         }
1748
1749         /* Loop through the records and build reply */
1750         while (cpos < cend && ncookies > 0) {
1751                 nlen = dp->d_namlen;
1752                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1753                         nlen <= NFS_MAXNAMLEN) {
1754                         if (nd->nd_flag & ND_NFSV3)
1755                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1756                         else
1757                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1758                         if (dirlen > cnt) {
1759                                 eofflag = 0;
1760                                 break;
1761                         }
1762
1763                         /*
1764                          * Build the directory record xdr from
1765                          * the dirent entry.
1766                          */
1767                         if (nd->nd_flag & ND_NFSV3) {
1768                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1769                                 *tl++ = newnfs_true;
1770                                 *tl++ = 0;
1771                         } else {
1772                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1773                                 *tl++ = newnfs_true;
1774                         }
1775                         *tl = txdr_unsigned(dp->d_fileno);
1776                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1777                         if (nd->nd_flag & ND_NFSV3) {
1778                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1779                                 *tl++ = 0;
1780                         } else
1781                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1782                         *tl = txdr_unsigned(*cookiep);
1783                 }
1784                 cpos += dp->d_reclen;
1785                 dp = (struct dirent *)cpos;
1786                 cookiep++;
1787                 ncookies--;
1788         }
1789         if (cpos < cend)
1790                 eofflag = 0;
1791         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1792         *tl++ = newnfs_false;
1793         if (eofflag)
1794                 *tl = newnfs_true;
1795         else
1796                 *tl = newnfs_false;
1797         FREE((caddr_t)rbuf, M_TEMP);
1798         FREE((caddr_t)cookies, M_TEMP);
1799
1800 out:
1801         NFSEXITCODE2(0, nd);
1802         return (0);
1803 nfsmout:
1804         vput(vp);
1805         NFSEXITCODE2(error, nd);
1806         return (error);
1807 }
1808
1809 /*
1810  * Readdirplus for V3 and Readdir for V4.
1811  */
1812 int
1813 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1814     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1815 {
1816         struct dirent *dp;
1817         u_int32_t *tl;
1818         int dirlen;
1819         char *cpos, *cend, *rbuf;
1820         struct vnode *nvp;
1821         fhandle_t nfh;
1822         struct nfsvattr nva, at, *nvap = &nva;
1823         struct mbuf *mb0, *mb1;
1824         struct nfsreferral *refp;
1825         int nlen, r, error = 0, getret = 1, usevget = 1;
1826         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1827         caddr_t bpos0, bpos1;
1828         u_int64_t off, toff, verf;
1829         u_long *cookies = NULL, *cookiep;
1830         nfsattrbit_t attrbits, rderrbits, savbits;
1831         struct uio io;
1832         struct iovec iv;
1833         struct componentname cn;
1834         int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
1835         struct mount *mp, *new_mp;
1836         uint64_t mounted_on_fileno;
1837
1838         if (nd->nd_repstat) {
1839                 nfsrv_postopattr(nd, getret, &at);
1840                 goto out;
1841         }
1842         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1843         off = fxdr_hyper(tl);
1844         toff = off;
1845         tl += 2;
1846         verf = fxdr_hyper(tl);
1847         tl += 2;
1848         siz = fxdr_unsigned(int, *tl++);
1849         cnt = fxdr_unsigned(int, *tl);
1850
1851         /*
1852          * Use the server's maximum data transfer size as the upper bound
1853          * on reply datalen.
1854          */
1855         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1856                 cnt = NFS_SRVMAXDATA(nd);
1857
1858         /*
1859          * siz is a "hint" of how much directory information (name, fileid,
1860          * cookie) should be in the reply. At least one client "hints" 0,
1861          * so I set it to cnt for that case. I also round it up to the
1862          * next multiple of DIRBLKSIZ.
1863          */
1864         if (siz <= 0)
1865                 siz = cnt;
1866         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1867
1868         if (nd->nd_flag & ND_NFSV4) {
1869                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1870                 if (error)
1871                         goto nfsmout;
1872                 NFSSET_ATTRBIT(&savbits, &attrbits);
1873                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1874                 NFSZERO_ATTRBIT(&rderrbits);
1875                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1876         } else {
1877                 NFSZERO_ATTRBIT(&attrbits);
1878         }
1879         fullsiz = siz;
1880         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1881         if (!nd->nd_repstat) {
1882             if (off && verf != at.na_filerev) {
1883                 /*
1884                  * va_filerev is not sufficient as a cookie verifier,
1885                  * since it is not supposed to change when entries are
1886                  * removed/added unless that offset cookies returned to
1887                  * the client are no longer valid.
1888                  */
1889 #if 0
1890                 if (nd->nd_flag & ND_NFSV4) {
1891                         nd->nd_repstat = NFSERR_NOTSAME;
1892                 } else {
1893                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1894                 }
1895 #endif
1896             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1897                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1898             }
1899         }
1900         if (!nd->nd_repstat && vp->v_type != VDIR)
1901                 nd->nd_repstat = NFSERR_NOTDIR;
1902         if (!nd->nd_repstat && cnt == 0)
1903                 nd->nd_repstat = NFSERR_TOOSMALL;
1904         if (!nd->nd_repstat)
1905                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1906                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1907                     NFSACCCHK_VPISLOCKED, NULL);
1908         if (nd->nd_repstat) {
1909                 vput(vp);
1910                 if (nd->nd_flag & ND_NFSV3)
1911                         nfsrv_postopattr(nd, getret, &at);
1912                 goto out;
1913         }
1914         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1915         is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;
1916
1917         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1918 again:
1919         eofflag = 0;
1920         if (cookies) {
1921                 free((caddr_t)cookies, M_TEMP);
1922                 cookies = NULL;
1923         }
1924
1925         iv.iov_base = rbuf;
1926         iv.iov_len = siz;
1927         io.uio_iov = &iv;
1928         io.uio_iovcnt = 1;
1929         io.uio_offset = (off_t)off;
1930         io.uio_resid = siz;
1931         io.uio_segflg = UIO_SYSSPACE;
1932         io.uio_rw = UIO_READ;
1933         io.uio_td = NULL;
1934         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1935             &cookies);
1936         off = (u_int64_t)io.uio_offset;
1937         if (io.uio_resid)
1938                 siz -= io.uio_resid;
1939
1940         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1941
1942         if (!cookies && !nd->nd_repstat)
1943                 nd->nd_repstat = NFSERR_PERM;
1944         if (!nd->nd_repstat)
1945                 nd->nd_repstat = getret;
1946         if (nd->nd_repstat) {
1947                 vput(vp);
1948                 if (cookies)
1949                         free((caddr_t)cookies, M_TEMP);
1950                 free((caddr_t)rbuf, M_TEMP);
1951                 if (nd->nd_flag & ND_NFSV3)
1952                         nfsrv_postopattr(nd, getret, &at);
1953                 goto out;
1954         }
1955         /*
1956          * If nothing read, return eof
1957          * rpc reply
1958          */
1959         if (siz == 0) {
1960                 vput(vp);
1961                 if (nd->nd_flag & ND_NFSV3)
1962                         nfsrv_postopattr(nd, getret, &at);
1963                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1964                 txdr_hyper(at.na_filerev, tl);
1965                 tl += 2;
1966                 *tl++ = newnfs_false;
1967                 *tl = newnfs_true;
1968                 free((caddr_t)cookies, M_TEMP);
1969                 free((caddr_t)rbuf, M_TEMP);
1970                 goto out;
1971         }
1972
1973         /*
1974          * Check for degenerate cases of nothing useful read.
1975          * If so go try again
1976          */
1977         cpos = rbuf;
1978         cend = rbuf + siz;
1979         dp = (struct dirent *)cpos;
1980         cookiep = cookies;
1981
1982         /*
1983          * For some reason FreeBSD's ufs_readdir() chooses to back the
1984          * directory offset up to a block boundary, so it is necessary to
1985          * skip over the records that precede the requested offset. This
1986          * requires the assumption that file offset cookies monotonically
1987          * increase.
1988          */
1989         while (cpos < cend && ncookies > 0 &&
1990           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1991            (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
1992            ((nd->nd_flag & ND_NFSV4) &&
1993             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1994              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1995                 cpos += dp->d_reclen;
1996                 dp = (struct dirent *)cpos;
1997                 cookiep++;
1998                 ncookies--;
1999         }
2000         if (cpos >= cend || ncookies == 0) {
2001                 siz = fullsiz;
2002                 toff = off;
2003                 goto again;
2004         }
2005
2006         /*
2007          * Busy the file system so that the mount point won't go away
2008          * and, as such, VFS_VGET() can be used safely.
2009          */
2010         mp = vp->v_mount;
2011         vfs_ref(mp);
2012         NFSVOPUNLOCK(vp, 0);
2013         nd->nd_repstat = vfs_busy(mp, 0);
2014         vfs_rel(mp);
2015         if (nd->nd_repstat != 0) {
2016                 vrele(vp);
2017                 free(cookies, M_TEMP);
2018                 free(rbuf, M_TEMP);
2019                 if (nd->nd_flag & ND_NFSV3)
2020                         nfsrv_postopattr(nd, getret, &at);
2021                 goto out;
2022         }
2023
2024         /*
2025          * Check to see if entries in this directory can be safely acquired
2026          * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
2027          * ZFS snapshot directories need VOP_LOOKUP(), so that any
2028          * automount of the snapshot directory that is required will
2029          * be done.
2030          * This needs to be done here for NFSv4, since NFSv4 never does
2031          * a VFS_VGET() for "." or "..".
2032          */
2033         if (is_zfs == 1) {
2034                 r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
2035                 if (r == EOPNOTSUPP) {
2036                         usevget = 0;
2037                         cn.cn_nameiop = LOOKUP;
2038                         cn.cn_lkflags = LK_SHARED | LK_RETRY;
2039                         cn.cn_cred = nd->nd_cred;
2040                         cn.cn_thread = p;
2041                 } else if (r == 0)
2042                         vput(nvp);
2043         }
2044
2045         /*
2046          * Save this position, in case there is an error before one entry
2047          * is created.
2048          */
2049         mb0 = nd->nd_mb;
2050         bpos0 = nd->nd_bpos;
2051
2052         /*
2053          * Fill in the first part of the reply.
2054          * dirlen is the reply length in bytes and cannot exceed cnt.
2055          * (Include the two booleans at the end of the reply in dirlen now,
2056          *  so we recognize when we have exceeded cnt.)
2057          */
2058         if (nd->nd_flag & ND_NFSV3) {
2059                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
2060                 nfsrv_postopattr(nd, getret, &at);
2061         } else {
2062                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
2063         }
2064         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
2065         txdr_hyper(at.na_filerev, tl);
2066
2067         /*
2068          * Save this position, in case there is an empty reply needed.
2069          */
2070         mb1 = nd->nd_mb;
2071         bpos1 = nd->nd_bpos;
2072
2073         /* Loop through the records and build reply */
2074         entrycnt = 0;
2075         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
2076                 nlen = dp->d_namlen;
2077                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
2078                     nlen <= NFS_MAXNAMLEN &&
2079                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
2080                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
2081                       || (nlen == 1 && dp->d_name[0] != '.'))) {
2082                         /*
2083                          * Save the current position in the reply, in case
2084                          * this entry exceeds cnt.
2085                          */
2086                         mb1 = nd->nd_mb;
2087                         bpos1 = nd->nd_bpos;
2088
2089                         /*
2090                          * For readdir_and_lookup get the vnode using
2091                          * the file number.
2092                          */
2093                         nvp = NULL;
2094                         refp = NULL;
2095                         r = 0;
2096                         at_root = 0;
2097                         needs_unbusy = 0;
2098                         new_mp = mp;
2099                         mounted_on_fileno = (uint64_t)dp->d_fileno;
2100                         if ((nd->nd_flag & ND_NFSV3) ||
2101                             NFSNONZERO_ATTRBIT(&savbits)) {
2102                                 if (nd->nd_flag & ND_NFSV4)
2103                                         refp = nfsv4root_getreferral(NULL,
2104                                             vp, dp->d_fileno);
2105                                 if (refp == NULL) {
2106                                         if (usevget)
2107                                                 r = VFS_VGET(mp, dp->d_fileno,
2108                                                     LK_SHARED, &nvp);
2109                                         else
2110                                                 r = EOPNOTSUPP;
2111                                         if (r == EOPNOTSUPP) {
2112                                                 if (usevget) {
2113                                                         usevget = 0;
2114                                                         cn.cn_nameiop = LOOKUP;
2115                                                         cn.cn_lkflags =
2116                                                             LK_SHARED |
2117                                                             LK_RETRY;
2118                                                         cn.cn_cred =
2119                                                             nd->nd_cred;
2120                                                         cn.cn_thread = p;
2121                                                 }
2122                                                 cn.cn_nameptr = dp->d_name;
2123                                                 cn.cn_namelen = nlen;
2124                                                 cn.cn_flags = ISLASTCN |
2125                                                     NOFOLLOW | LOCKLEAF;
2126                                                 if (nlen == 2 &&
2127                                                     dp->d_name[0] == '.' &&
2128                                                     dp->d_name[1] == '.')
2129                                                         cn.cn_flags |=
2130                                                             ISDOTDOT;
2131                                                 if (NFSVOPLOCK(vp, LK_SHARED)
2132                                                     != 0) {
2133                                                         nd->nd_repstat = EPERM;
2134                                                         break;
2135                                                 }
2136                                                 if ((vp->v_vflag & VV_ROOT) != 0
2137                                                     && (cn.cn_flags & ISDOTDOT)
2138                                                     != 0) {
2139                                                         vref(vp);
2140                                                         nvp = vp;
2141                                                         r = 0;
2142                                                 } else {
2143                                                         r = VOP_LOOKUP(vp, &nvp,
2144                                                             &cn);
2145                                                         if (vp != nvp)
2146                                                                 NFSVOPUNLOCK(vp,
2147                                                                     0);
2148                                                 }
2149                                         }
2150
2151                                         /*
2152                                          * For NFSv4, check to see if nvp is
2153                                          * a mount point and get the mount
2154                                          * point vnode, as required.
2155                                          */
2156                                         if (r == 0 &&
2157                                             nfsrv_enable_crossmntpt != 0 &&
2158                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2159                                             nvp->v_type == VDIR &&
2160                                             nvp->v_mountedhere != NULL) {
2161                                                 new_mp = nvp->v_mountedhere;
2162                                                 r = vfs_busy(new_mp, 0);
2163                                                 vput(nvp);
2164                                                 nvp = NULL;
2165                                                 if (r == 0) {
2166                                                         r = VFS_ROOT(new_mp,
2167                                                             LK_SHARED, &nvp);
2168                                                         needs_unbusy = 1;
2169                                                         if (r == 0)
2170                                                                 at_root = 1;
2171                                                 }
2172                                         }
2173                                 }
2174                                 if (!r) {
2175                                     if (refp == NULL &&
2176                                         ((nd->nd_flag & ND_NFSV3) ||
2177                                          NFSNONZERO_ATTRBIT(&attrbits))) {
2178                                         r = nfsvno_getfh(nvp, &nfh, p);
2179                                         if (!r)
2180                                             r = nfsvno_getattr(nvp, nvap,
2181                                                 nd->nd_cred, p, 1);
2182                                         if (r == 0 && is_zfs == 1 &&
2183                                             nfsrv_enable_crossmntpt != 0 &&
2184                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2185                                             nvp->v_type == VDIR &&
2186                                             vp->v_mount != nvp->v_mount) {
2187                                             /*
2188                                              * For a ZFS snapshot, there is a
2189                                              * pseudo mount that does not set
2190                                              * v_mountedhere, so it needs to
2191                                              * be detected via a different
2192                                              * mount structure.
2193                                              */
2194                                             at_root = 1;
2195                                             if (new_mp == mp)
2196                                                 new_mp = nvp->v_mount;
2197                                         }
2198                                     }
2199                                 } else {
2200                                     nvp = NULL;
2201                                 }
2202                                 if (r) {
2203                                         if (!NFSISSET_ATTRBIT(&attrbits,
2204                                             NFSATTRBIT_RDATTRERROR)) {
2205                                                 if (nvp != NULL)
2206                                                         vput(nvp);
2207                                                 if (needs_unbusy != 0)
2208                                                         vfs_unbusy(new_mp);
2209                                                 nd->nd_repstat = r;
2210                                                 break;
2211                                         }
2212                                 }
2213                         }
2214
2215                         /*
2216                          * Build the directory record xdr
2217                          */
2218                         if (nd->nd_flag & ND_NFSV3) {
2219                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2220                                 *tl++ = newnfs_true;
2221                                 *tl++ = 0;
2222                                 *tl = txdr_unsigned(dp->d_fileno);
2223                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2224                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2225                                 *tl++ = 0;
2226                                 *tl = txdr_unsigned(*cookiep);
2227                                 nfsrv_postopattr(nd, 0, nvap);
2228                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2229                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2230                                 if (nvp != NULL)
2231                                         vput(nvp);
2232                         } else {
2233                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2234                                 *tl++ = newnfs_true;
2235                                 *tl++ = 0;
2236                                 *tl = txdr_unsigned(*cookiep);
2237                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2238                                 if (nvp != NULL) {
2239                                         supports_nfsv4acls =
2240                                             nfs_supportsnfsv4acls(nvp);
2241                                         NFSVOPUNLOCK(nvp, 0);
2242                                 } else
2243                                         supports_nfsv4acls = 0;
2244                                 if (refp != NULL) {
2245                                         dirlen += nfsrv_putreferralattr(nd,
2246                                             &savbits, refp, 0,
2247                                             &nd->nd_repstat);
2248                                         if (nd->nd_repstat) {
2249                                                 if (nvp != NULL)
2250                                                         vrele(nvp);
2251                                                 if (needs_unbusy != 0)
2252                                                         vfs_unbusy(new_mp);
2253                                                 break;
2254                                         }
2255                                 } else if (r) {
2256                                         dirlen += nfsvno_fillattr(nd, new_mp,
2257                                             nvp, nvap, &nfh, r, &rderrbits,
2258                                             nd->nd_cred, p, isdgram, 0,
2259                                             supports_nfsv4acls, at_root,
2260                                             mounted_on_fileno);
2261                                 } else {
2262                                         dirlen += nfsvno_fillattr(nd, new_mp,
2263                                             nvp, nvap, &nfh, r, &attrbits,
2264                                             nd->nd_cred, p, isdgram, 0,
2265                                             supports_nfsv4acls, at_root,
2266                                             mounted_on_fileno);
2267                                 }
2268                                 if (nvp != NULL)
2269                                         vrele(nvp);
2270                                 dirlen += (3 * NFSX_UNSIGNED);
2271                         }
2272                         if (needs_unbusy != 0)
2273                                 vfs_unbusy(new_mp);
2274                         if (dirlen <= cnt)
2275                                 entrycnt++;
2276                 }
2277                 cpos += dp->d_reclen;
2278                 dp = (struct dirent *)cpos;
2279                 cookiep++;
2280                 ncookies--;
2281         }
2282         vrele(vp);
2283         vfs_unbusy(mp);
2284
2285         /*
2286          * If dirlen > cnt, we must strip off the last entry. If that
2287          * results in an empty reply, report NFSERR_TOOSMALL.
2288          */
2289         if (dirlen > cnt || nd->nd_repstat) {
2290                 if (!nd->nd_repstat && entrycnt == 0)
2291                         nd->nd_repstat = NFSERR_TOOSMALL;
2292                 if (nd->nd_repstat) {
2293                         newnfs_trimtrailing(nd, mb0, bpos0);
2294                         if (nd->nd_flag & ND_NFSV3)
2295                                 nfsrv_postopattr(nd, getret, &at);
2296                 } else
2297                         newnfs_trimtrailing(nd, mb1, bpos1);
2298                 eofflag = 0;
2299         } else if (cpos < cend)
2300                 eofflag = 0;
2301         if (!nd->nd_repstat) {
2302                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2303                 *tl++ = newnfs_false;
2304                 if (eofflag)
2305                         *tl = newnfs_true;
2306                 else
2307                         *tl = newnfs_false;
2308         }
2309         FREE((caddr_t)cookies, M_TEMP);
2310         FREE((caddr_t)rbuf, M_TEMP);
2311
2312 out:
2313         NFSEXITCODE2(0, nd);
2314         return (0);
2315 nfsmout:
2316         vput(vp);
2317         NFSEXITCODE2(error, nd);
2318         return (error);
2319 }
2320
2321 /*
2322  * Get the settable attributes out of the mbuf list.
2323  * (Return 0 or EBADRPC)
2324  */
2325 int
2326 nfsrv_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
2327     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2328 {
2329         u_int32_t *tl;
2330         struct nfsv2_sattr *sp;
2331         int error = 0, toclient = 0;
2332
2333         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2334         case ND_NFSV2:
2335                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2336                 /*
2337                  * Some old clients didn't fill in the high order 16bits.
2338                  * --> check the low order 2 bytes for 0xffff
2339                  */
2340                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2341                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2342                 if (sp->sa_uid != newnfs_xdrneg1)
2343                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2344                 if (sp->sa_gid != newnfs_xdrneg1)
2345                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2346                 if (sp->sa_size != newnfs_xdrneg1)
2347                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2348                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2349 #ifdef notyet
2350                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2351 #else
2352                         nvap->na_atime.tv_sec =
2353                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2354                         nvap->na_atime.tv_nsec = 0;
2355 #endif
2356                 }
2357                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2358                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2359                 break;
2360         case ND_NFSV3:
2361                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2362                 if (*tl == newnfs_true) {
2363                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2364                         nvap->na_mode = nfstov_mode(*tl);
2365                 }
2366                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2367                 if (*tl == newnfs_true) {
2368                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2369                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2370                 }
2371                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2372                 if (*tl == newnfs_true) {
2373                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2374                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2375                 }
2376                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2377                 if (*tl == newnfs_true) {
2378                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2379                         nvap->na_size = fxdr_hyper(tl);
2380                 }
2381                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2382                 switch (fxdr_unsigned(int, *tl)) {
2383                 case NFSV3SATTRTIME_TOCLIENT:
2384                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2385                         fxdr_nfsv3time(tl, &nvap->na_atime);
2386                         toclient = 1;
2387                         break;
2388                 case NFSV3SATTRTIME_TOSERVER:
2389                         vfs_timestamp(&nvap->na_atime);
2390                         nvap->na_vaflags |= VA_UTIMES_NULL;
2391                         break;
2392                 }
2393                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2394                 switch (fxdr_unsigned(int, *tl)) {
2395                 case NFSV3SATTRTIME_TOCLIENT:
2396                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2397                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2398                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2399                         break;
2400                 case NFSV3SATTRTIME_TOSERVER:
2401                         vfs_timestamp(&nvap->na_mtime);
2402                         if (!toclient)
2403                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2404                         break;
2405                 }
2406                 break;
2407         case ND_NFSV4:
2408                 error = nfsv4_sattr(nd, vp, nvap, attrbitp, aclp, p);
2409         }
2410 nfsmout:
2411         NFSEXITCODE2(error, nd);
2412         return (error);
2413 }
2414
2415 /*
2416  * Handle the setable attributes for V4.
2417  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2418  */
2419 int
2420 nfsv4_sattr(struct nfsrv_descript *nd, vnode_t vp, struct nfsvattr *nvap,
2421     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2422 {
2423         u_int32_t *tl;
2424         int attrsum = 0;
2425         int i, j;
2426         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2427         int toclient = 0;
2428         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2429         uid_t uid;
2430         gid_t gid;
2431
2432         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2433         if (error)
2434                 goto nfsmout;
2435         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2436         attrsize = fxdr_unsigned(int, *tl);
2437
2438         /*
2439          * Loop around getting the setable attributes. If an unsupported
2440          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2441          */
2442         if (retnotsup) {
2443                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2444                 bitpos = NFSATTRBIT_MAX;
2445         } else {
2446                 bitpos = 0;
2447         }
2448         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2449             if (attrsum > attrsize) {
2450                 error = NFSERR_BADXDR;
2451                 goto nfsmout;
2452             }
2453             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2454                 switch (bitpos) {
2455                 case NFSATTRBIT_SIZE:
2456                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2457                      if (vp != NULL && vp->v_type != VREG) {
2458                             error = (vp->v_type == VDIR) ? NFSERR_ISDIR :
2459                                 NFSERR_INVAL;
2460                             goto nfsmout;
2461                         }
2462                         nvap->na_size = fxdr_hyper(tl);
2463                         attrsum += NFSX_HYPER;
2464                         break;
2465                 case NFSATTRBIT_ACL:
2466                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2467                             p);
2468                         if (error)
2469                                 goto nfsmout;
2470                         if (aceerr && !nd->nd_repstat)
2471                                 nd->nd_repstat = aceerr;
2472                         attrsum += aclsize;
2473                         break;
2474                 case NFSATTRBIT_ARCHIVE:
2475                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2476                         if (!nd->nd_repstat)
2477                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2478                         attrsum += NFSX_UNSIGNED;
2479                         break;
2480                 case NFSATTRBIT_HIDDEN:
2481                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2482                         if (!nd->nd_repstat)
2483                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2484                         attrsum += NFSX_UNSIGNED;
2485                         break;
2486                 case NFSATTRBIT_MIMETYPE:
2487                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2488                         i = fxdr_unsigned(int, *tl);
2489                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2490                         if (error)
2491                                 goto nfsmout;
2492                         if (!nd->nd_repstat)
2493                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2494                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2495                         break;
2496                 case NFSATTRBIT_MODE:
2497                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2498                         nvap->na_mode = nfstov_mode(*tl);
2499                         attrsum += NFSX_UNSIGNED;
2500                         break;
2501                 case NFSATTRBIT_OWNER:
2502                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2503                         j = fxdr_unsigned(int, *tl);
2504                         if (j < 0) {
2505                                 error = NFSERR_BADXDR;
2506                                 goto nfsmout;
2507                         }
2508                         if (j > NFSV4_SMALLSTR)
2509                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2510                         else
2511                                 cp = namestr;
2512                         error = nfsrv_mtostr(nd, cp, j);
2513                         if (error) {
2514                                 if (j > NFSV4_SMALLSTR)
2515                                         free(cp, M_NFSSTRING);
2516                                 goto nfsmout;
2517                         }
2518                         if (!nd->nd_repstat) {
2519                                 nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
2520                                     p);
2521                                 if (!nd->nd_repstat)
2522                                         nvap->na_uid = uid;
2523                         }
2524                         if (j > NFSV4_SMALLSTR)
2525                                 free(cp, M_NFSSTRING);
2526                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2527                         break;
2528                 case NFSATTRBIT_OWNERGROUP:
2529                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2530                         j = fxdr_unsigned(int, *tl);
2531                         if (j < 0) {
2532                                 error = NFSERR_BADXDR;
2533                                 goto nfsmout;
2534                         }
2535                         if (j > NFSV4_SMALLSTR)
2536                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2537                         else
2538                                 cp = namestr;
2539                         error = nfsrv_mtostr(nd, cp, j);
2540                         if (error) {
2541                                 if (j > NFSV4_SMALLSTR)
2542                                         free(cp, M_NFSSTRING);
2543                                 goto nfsmout;
2544                         }
2545                         if (!nd->nd_repstat) {
2546                                 nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
2547                                     p);
2548                                 if (!nd->nd_repstat)
2549                                         nvap->na_gid = gid;
2550                         }
2551                         if (j > NFSV4_SMALLSTR)
2552                                 free(cp, M_NFSSTRING);
2553                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2554                         break;
2555                 case NFSATTRBIT_SYSTEM:
2556                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2557                         if (!nd->nd_repstat)
2558                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2559                         attrsum += NFSX_UNSIGNED;
2560                         break;
2561                 case NFSATTRBIT_TIMEACCESSSET:
2562                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2563                         attrsum += NFSX_UNSIGNED;
2564                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2565                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2566                             fxdr_nfsv4time(tl, &nvap->na_atime);
2567                             toclient = 1;
2568                             attrsum += NFSX_V4TIME;
2569                         } else {
2570                             vfs_timestamp(&nvap->na_atime);
2571                             nvap->na_vaflags |= VA_UTIMES_NULL;
2572                         }
2573                         break;
2574                 case NFSATTRBIT_TIMEBACKUP:
2575                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2576                         if (!nd->nd_repstat)
2577                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2578                         attrsum += NFSX_V4TIME;
2579                         break;
2580                 case NFSATTRBIT_TIMECREATE:
2581                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2582                         if (!nd->nd_repstat)
2583                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2584                         attrsum += NFSX_V4TIME;
2585                         break;
2586                 case NFSATTRBIT_TIMEMODIFYSET:
2587                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2588                         attrsum += NFSX_UNSIGNED;
2589                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2590                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2591                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2592                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2593                             attrsum += NFSX_V4TIME;
2594                         } else {
2595                             vfs_timestamp(&nvap->na_mtime);
2596                             if (!toclient)
2597                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2598                         }
2599                         break;
2600                 default:
2601                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2602                         /*
2603                          * set bitpos so we drop out of the loop.
2604                          */
2605                         bitpos = NFSATTRBIT_MAX;
2606                         break;
2607                 }
2608         }
2609
2610         /*
2611          * some clients pad the attrlist, so we need to skip over the
2612          * padding.
2613          */
2614         if (attrsum > attrsize) {
2615                 error = NFSERR_BADXDR;
2616         } else {
2617                 attrsize = NFSM_RNDUP(attrsize);
2618                 if (attrsum < attrsize)
2619                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2620         }
2621 nfsmout:
2622         NFSEXITCODE2(error, nd);
2623         return (error);
2624 }
2625
2626 /*
2627  * Check/setup export credentials.
2628  */
2629 int
2630 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2631     struct ucred *credanon)
2632 {
2633         int error = 0;
2634
2635         /*
2636          * Check/setup credentials.
2637          */
2638         if (nd->nd_flag & ND_GSS)
2639                 exp->nes_exflag &= ~MNT_EXPORTANON;
2640
2641         /*
2642          * Check to see if the operation is allowed for this security flavor.
2643          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2644          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2645          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2646          */
2647         if (nfsvno_testexp(nd, exp) &&
2648             nd->nd_procnum != NFSV4OP_SECINFO &&
2649             nd->nd_procnum != NFSPROC_FSINFO) {
2650                 if (nd->nd_flag & ND_NFSV4)
2651                         error = NFSERR_WRONGSEC;
2652                 else
2653                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2654                 goto out;
2655         }
2656
2657         /*
2658          * Check to see if the file system is exported V4 only.
2659          */
2660         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2661                 error = NFSERR_PROGNOTV4;
2662                 goto out;
2663         }
2664
2665         /*
2666          * Now, map the user credentials.
2667          * (Note that ND_AUTHNONE will only be set for an NFSv3
2668          *  Fsinfo RPC. If set for anything else, this code might need
2669          *  to change.)
2670          */
2671         if (NFSVNO_EXPORTED(exp)) {
2672                 if (((nd->nd_flag & ND_GSS) == 0 && nd->nd_cred->cr_uid == 0) ||
2673                      NFSVNO_EXPORTANON(exp) ||
2674                      (nd->nd_flag & ND_AUTHNONE) != 0) {
2675                         nd->nd_cred->cr_uid = credanon->cr_uid;
2676                         nd->nd_cred->cr_gid = credanon->cr_gid;
2677                         crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2678                             credanon->cr_groups);
2679                 } else if ((nd->nd_flag & ND_GSS) == 0) {
2680                         /*
2681                          * If using AUTH_SYS, call nfsrv_getgrpscred() to see
2682                          * if there is a replacement credential with a group
2683                          * list set up by "nfsuserd -manage-gids".
2684                          * If there is no replacement, nfsrv_getgrpscred()
2685                          * simply returns its argument.
2686                          */
2687                         nd->nd_cred = nfsrv_getgrpscred(nd->nd_cred);
2688                 }
2689         }
2690
2691 out:
2692         NFSEXITCODE2(error, nd);
2693         return (error);
2694 }
2695
2696 /*
2697  * Check exports.
2698  */
2699 int
2700 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2701     struct ucred **credp)
2702 {
2703         int i, error, *secflavors;
2704
2705         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2706             &exp->nes_numsecflavor, &secflavors);
2707         if (error) {
2708                 if (nfs_rootfhset) {
2709                         exp->nes_exflag = 0;
2710                         exp->nes_numsecflavor = 0;
2711                         error = 0;
2712                 }
2713         } else {
2714                 /* Copy the security flavors. */
2715                 for (i = 0; i < exp->nes_numsecflavor; i++)
2716                         exp->nes_secflavors[i] = secflavors[i];
2717         }
2718         NFSEXITCODE(error);
2719         return (error);
2720 }
2721
2722 /*
2723  * Get a vnode for a file handle and export stuff.
2724  */
2725 int
2726 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2727     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2728     struct ucred **credp)
2729 {
2730         int i, error, *secflavors;
2731
2732         *credp = NULL;
2733         exp->nes_numsecflavor = 0;
2734         error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
2735         if (error != 0)
2736                 /* Make sure the server replies ESTALE to the client. */
2737                 error = ESTALE;
2738         if (nam && !error) {
2739                 error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2740                     &exp->nes_numsecflavor, &secflavors);
2741                 if (error) {
2742                         if (nfs_rootfhset) {
2743                                 exp->nes_exflag = 0;
2744                                 exp->nes_numsecflavor = 0;
2745                                 error = 0;
2746                         } else {
2747                                 vput(*vpp);
2748                         }
2749                 } else {
2750                         /* Copy the security flavors. */
2751                         for (i = 0; i < exp->nes_numsecflavor; i++)
2752                                 exp->nes_secflavors[i] = secflavors[i];
2753                 }
2754         }
2755         NFSEXITCODE(error);
2756         return (error);
2757 }
2758
2759 /*
2760  * nfsd_fhtovp() - convert a fh to a vnode ptr
2761  *      - look up fsid in mount list (if not found ret error)
2762  *      - get vp and export rights by calling nfsvno_fhtovp()
2763  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2764  *        for AUTH_SYS
2765  *      - if mpp != NULL, return the mount point so that it can
2766  *        be used for vn_finished_write() by the caller
2767  */
2768 void
2769 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2770     struct vnode **vpp, struct nfsexstuff *exp,
2771     struct mount **mpp, int startwrite, struct thread *p)
2772 {
2773         struct mount *mp;
2774         struct ucred *credanon;
2775         fhandle_t *fhp;
2776
2777         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2778         /*
2779          * Check for the special case of the nfsv4root_fh.
2780          */
2781         mp = vfs_busyfs(&fhp->fh_fsid);
2782         if (mpp != NULL)
2783                 *mpp = mp;
2784         if (mp == NULL) {
2785                 *vpp = NULL;
2786                 nd->nd_repstat = ESTALE;
2787                 goto out;
2788         }
2789
2790         if (startwrite) {
2791                 vn_start_write(NULL, mpp, V_WAIT);
2792                 if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
2793                         lktype = LK_EXCLUSIVE;
2794         }
2795         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2796             &credanon);
2797         vfs_unbusy(mp);
2798
2799         /*
2800          * For NFSv4 without a pseudo root fs, unexported file handles
2801          * can be returned, so that Lookup works everywhere.
2802          */
2803         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2804             !(nd->nd_flag & ND_NFSV4)) {
2805                 vput(*vpp);
2806                 nd->nd_repstat = EACCES;
2807         }
2808
2809         /*
2810          * Personally, I've never seen any point in requiring a
2811          * reserved port#, since only in the rare case where the
2812          * clients are all boxes with secure system privileges,
2813          * does it provide any enhanced security, but... some people
2814          * believe it to be useful and keep putting this code back in.
2815          * (There is also some "security checker" out there that
2816          *  complains if the nfs server doesn't enforce this.)
2817          * However, note the following:
2818          * RFC3530 (NFSv4) specifies that a reserved port# not be
2819          *      required.
2820          * RFC2623 recommends that, if a reserved port# is checked for,
2821          *      that there be a way to turn that off--> ifdef'd.
2822          */
2823 #ifdef NFS_REQRSVPORT
2824         if (!nd->nd_repstat) {
2825                 struct sockaddr_in *saddr;
2826                 struct sockaddr_in6 *saddr6;
2827
2828                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2829                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2830                 if (!(nd->nd_flag & ND_NFSV4) &&
2831                     ((saddr->sin_family == AF_INET &&
2832                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2833                      (saddr6->sin6_family == AF_INET6 &&
2834                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2835                         vput(*vpp);
2836                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2837                 }
2838         }
2839 #endif  /* NFS_REQRSVPORT */
2840
2841         /*
2842          * Check/setup credentials.
2843          */
2844         if (!nd->nd_repstat) {
2845                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2846                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2847                 if (nd->nd_repstat)
2848                         vput(*vpp);
2849         }
2850         if (credanon != NULL)
2851                 crfree(credanon);
2852         if (nd->nd_repstat) {
2853                 if (startwrite)
2854                         vn_finished_write(mp);
2855                 *vpp = NULL;
2856                 if (mpp != NULL)
2857                         *mpp = NULL;
2858         }
2859
2860 out:
2861         NFSEXITCODE2(0, nd);
2862 }
2863
2864 /*
2865  * glue for fp.
2866  */
2867 static int
2868 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2869 {
2870         struct filedesc *fdp;
2871         struct file *fp;
2872         int error = 0;
2873
2874         fdp = p->td_proc->p_fd;
2875         if (fd < 0 || fd >= fdp->fd_nfiles ||
2876             (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
2877                 error = EBADF;
2878                 goto out;
2879         }
2880         *fpp = fp;
2881
2882 out:
2883         NFSEXITCODE(error);
2884         return (error);
2885 }
2886
2887 /*
2888  * Called from nfssvc() to update the exports list. Just call
2889  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2890  * in the mount list.
2891  */
2892 int
2893 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2894 {
2895         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2896         int error = 0;
2897         struct nameidata nd;
2898         fhandle_t fh;
2899
2900         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2901         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2902                 nfs_rootfhset = 0;
2903         else if (error == 0) {
2904                 if (nfsexargp->fspec == NULL) {
2905                         error = EPERM;
2906                         goto out;
2907                 }
2908                 /*
2909                  * If fspec != NULL, this is the v4root path.
2910                  */
2911                 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
2912                     nfsexargp->fspec, p);
2913                 if ((error = namei(&nd)) != 0)
2914                         goto out;
2915                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2916                 vrele(nd.ni_vp);
2917                 if (!error) {
2918                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2919                         NFSBCOPY((caddr_t)&fh,
2920                             nfs_rootfh.nfsrvfh_data,
2921                             sizeof (fhandle_t));
2922                         nfs_rootfhset = 1;
2923                 }
2924         }
2925
2926 out:
2927         NFSEXITCODE(error);
2928         return (error);
2929 }
2930
2931 /*
2932  * This function needs to test to see if the system is near its limit
2933  * for memory allocation via malloc() or mget() and return True iff
2934  * either of these resources are near their limit.
2935  * XXX (For now, this is just a stub.)
2936  */
2937 int nfsrv_testmalloclimit = 0;
2938 int
2939 nfsrv_mallocmget_limit(void)
2940 {
2941         static int printmesg = 0;
2942         static int testval = 1;
2943
2944         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2945                 if ((printmesg++ % 100) == 0)
2946                         printf("nfsd: malloc/mget near limit\n");
2947                 return (1);
2948         }
2949         return (0);
2950 }
2951
2952 /*
2953  * BSD specific initialization of a mount point.
2954  */
2955 void
2956 nfsd_mntinit(void)
2957 {
2958         static int inited = 0;
2959
2960         if (inited)
2961                 return;
2962         inited = 1;
2963         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2964         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2965         TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
2966         nfsv4root_mnt.mnt_export = NULL;
2967         TAILQ_INIT(&nfsv4root_opt);
2968         TAILQ_INIT(&nfsv4root_newopt);
2969         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2970         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2971         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2972         nfsv4root_mnt.mnt_activevnodelistsize = 0;
2973 }
2974
2975 /*
2976  * Get a vnode for a file handle, without checking exports, etc.
2977  */
2978 struct vnode *
2979 nfsvno_getvp(fhandle_t *fhp)
2980 {
2981         struct mount *mp;
2982         struct vnode *vp;
2983         int error;
2984
2985         mp = vfs_busyfs(&fhp->fh_fsid);
2986         if (mp == NULL)
2987                 return (NULL);
2988         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2989         vfs_unbusy(mp);
2990         if (error)
2991                 return (NULL);
2992         return (vp);
2993 }
2994
2995 /*
2996  * Do a local VOP_ADVLOCK().
2997  */
2998 int
2999 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
3000     u_int64_t end, struct thread *td)
3001 {
3002         int error = 0;
3003         struct flock fl;
3004         u_int64_t tlen;
3005
3006         if (nfsrv_dolocallocks == 0)
3007                 goto out;
3008         ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");
3009
3010         fl.l_whence = SEEK_SET;
3011         fl.l_type = ftype;
3012         fl.l_start = (off_t)first;
3013         if (end == NFS64BITSSET) {
3014                 fl.l_len = 0;
3015         } else {
3016                 tlen = end - first;
3017                 fl.l_len = (off_t)tlen;
3018         }
3019         /*
3020          * For FreeBSD8, the l_pid and l_sysid must be set to the same
3021          * values for all calls, so that all locks will be held by the
3022          * nfsd server. (The nfsd server handles conflicts between the
3023          * various clients.)
3024          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
3025          * bytes, so it can't be put in l_sysid.
3026          */
3027         if (nfsv4_sysid == 0)
3028                 nfsv4_sysid = nlm_acquire_next_sysid();
3029         fl.l_pid = (pid_t)0;
3030         fl.l_sysid = (int)nfsv4_sysid;
3031
3032         if (ftype == F_UNLCK)
3033                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
3034                     (F_POSIX | F_REMOTE));
3035         else
3036                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
3037                     (F_POSIX | F_REMOTE));
3038
3039 out:
3040         NFSEXITCODE(error);
3041         return (error);
3042 }
3043
3044 /*
3045  * Check the nfsv4 root exports.
3046  */
3047 int
3048 nfsvno_v4rootexport(struct nfsrv_descript *nd)
3049 {
3050         struct ucred *credanon;
3051         int exflags, error = 0, numsecflavor, *secflavors, i;
3052
3053         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
3054             &credanon, &numsecflavor, &secflavors);
3055         if (error) {
3056                 error = NFSERR_PROGUNAVAIL;
3057                 goto out;
3058         }
3059         if (credanon != NULL)
3060                 crfree(credanon);
3061         for (i = 0; i < numsecflavor; i++) {
3062                 if (secflavors[i] == AUTH_SYS)
3063                         nd->nd_flag |= ND_EXAUTHSYS;
3064                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3065                         nd->nd_flag |= ND_EXGSS;
3066                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3067                         nd->nd_flag |= ND_EXGSSINTEGRITY;
3068                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3069                         nd->nd_flag |= ND_EXGSSPRIVACY;
3070         }
3071
3072 out:
3073         NFSEXITCODE(error);
3074         return (error);
3075 }
3076
3077 /*
3078  * Nfs server pseudo system call for the nfsd's
3079  */
3080 /*
3081  * MPSAFE
3082  */
3083 static int
3084 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3085 {
3086         struct file *fp;
3087         struct nfsd_addsock_args sockarg;
3088         struct nfsd_nfsd_args nfsdarg;
3089         cap_rights_t rights;
3090         int error;
3091
3092         if (uap->flag & NFSSVC_NFSDADDSOCK) {
3093                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
3094                 if (error)
3095                         goto out;
3096                 /*
3097                  * Since we don't know what rights might be required,
3098                  * pretend that we need them all. It is better to be too
3099                  * careful than too reckless.
3100                  */
3101                 error = fget(td, sockarg.sock,
3102                     cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
3103                 if (error != 0)
3104                         goto out;
3105                 if (fp->f_type != DTYPE_SOCKET) {
3106                         fdrop(fp, td);
3107                         error = EPERM;
3108                         goto out;
3109                 }
3110                 error = nfsrvd_addsock(fp);
3111                 fdrop(fp, td);
3112         } else if (uap->flag & NFSSVC_NFSDNFSD) {
3113                 if (uap->argp == NULL) {
3114                         error = EINVAL;
3115                         goto out;
3116                 }
3117                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3118                     sizeof (nfsdarg));
3119                 if (error)
3120                         goto out;
3121                 error = nfsrvd_nfsd(td, &nfsdarg);
3122         } else {
3123                 error = nfssvc_srvcall(td, uap, td->td_ucred);
3124         }
3125
3126 out:
3127         NFSEXITCODE(error);
3128         return (error);
3129 }
3130
3131 static int
3132 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3133 {
3134         struct nfsex_args export;
3135         struct file *fp = NULL;
3136         int stablefd, len;
3137         struct nfsd_clid adminrevoke;
3138         struct nfsd_dumplist dumplist;
3139         struct nfsd_dumpclients *dumpclients;
3140         struct nfsd_dumplocklist dumplocklist;
3141         struct nfsd_dumplocks *dumplocks;
3142         struct nameidata nd;
3143         vnode_t vp;
3144         int error = EINVAL, igotlock;
3145         struct proc *procp;
3146         static int suspend_nfsd = 0;
3147
3148         if (uap->flag & NFSSVC_PUBLICFH) {
3149                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3150                     sizeof (fhandle_t));
3151                 error = copyin(uap->argp,
3152                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3153                 if (!error)
3154                         nfs_pubfhset = 1;
3155         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3156                 error = copyin(uap->argp,(caddr_t)&export,
3157                     sizeof (struct nfsex_args));
3158                 if (!error)
3159                         error = nfsrv_v4rootexport(&export, cred, p);
3160         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3161                 nfs_pubfhset = 0;
3162                 error = 0;
3163         } else if (uap->flag & NFSSVC_STABLERESTART) {
3164                 error = copyin(uap->argp, (caddr_t)&stablefd,
3165                     sizeof (int));
3166                 if (!error)
3167                         error = fp_getfvp(p, stablefd, &fp, &vp);
3168                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3169                         error = EBADF;
3170                 if (!error && newnfs_numnfsd != 0)
3171                         error = EPERM;
3172                 if (!error) {
3173                         nfsrv_stablefirst.nsf_fp = fp;
3174                         nfsrv_setupstable(p);
3175                 }
3176         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3177                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3178                     sizeof (struct nfsd_clid));
3179                 if (!error)
3180                         error = nfsrv_adminrevoke(&adminrevoke, p);
3181         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3182                 error = copyin(uap->argp, (caddr_t)&dumplist,
3183                     sizeof (struct nfsd_dumplist));
3184                 if (!error && (dumplist.ndl_size < 1 ||
3185                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3186                         error = EPERM;
3187                 if (!error) {
3188                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3189                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3190                         M_TEMP, M_WAITOK);
3191                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3192                     error = copyout(dumpclients,
3193                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3194                     free((caddr_t)dumpclients, M_TEMP);
3195                 }
3196         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3197                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3198                     sizeof (struct nfsd_dumplocklist));
3199                 if (!error && (dumplocklist.ndllck_size < 1 ||
3200                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3201                         error = EPERM;
3202                 if (!error)
3203                         error = nfsrv_lookupfilename(&nd,
3204                                 dumplocklist.ndllck_fname, p);
3205                 if (!error) {
3206                         len = sizeof (struct nfsd_dumplocks) *
3207                                 dumplocklist.ndllck_size;
3208                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3209                                 M_TEMP, M_WAITOK);
3210                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3211                             dumplocklist.ndllck_size, p);
3212                         vput(nd.ni_vp);
3213                         error = copyout(dumplocks,
3214                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3215                         free((caddr_t)dumplocks, M_TEMP);
3216                 }
3217         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3218                 procp = p->td_proc;
3219                 PROC_LOCK(procp);
3220                 nfsd_master_pid = procp->p_pid;
3221                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3222                 nfsd_master_start = procp->p_stats->p_start;
3223                 nfsd_master_proc = procp;
3224                 PROC_UNLOCK(procp);
3225         } else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
3226                 NFSLOCKV4ROOTMUTEX();
3227                 if (suspend_nfsd == 0) {
3228                         /* Lock out all nfsd threads */
3229                         do {
3230                                 igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
3231                                     NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
3232                         } while (igotlock == 0 && suspend_nfsd == 0);
3233                         suspend_nfsd = 1;
3234                 }
3235                 NFSUNLOCKV4ROOTMUTEX();
3236                 error = 0;
3237         } else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
3238                 NFSLOCKV4ROOTMUTEX();
3239                 if (suspend_nfsd != 0) {
3240                         nfsv4_unlock(&nfsd_suspend_lock, 0);
3241                         suspend_nfsd = 0;
3242                 }
3243                 NFSUNLOCKV4ROOTMUTEX();
3244                 error = 0;
3245         }
3246
3247         NFSEXITCODE(error);
3248         return (error);
3249 }
3250
3251 /*
3252  * Check exports.
3253  * Returns 0 if ok, 1 otherwise.
3254  */
3255 int
3256 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3257 {
3258         int i;
3259
3260         /*
3261          * This seems odd, but allow the case where the security flavor
3262          * list is empty. This happens when NFSv4 is traversing non-exported
3263          * file systems. Exported file systems should always have a non-empty
3264          * security flavor list.
3265          */
3266         if (exp->nes_numsecflavor == 0)
3267                 return (0);
3268
3269         for (i = 0; i < exp->nes_numsecflavor; i++) {
3270                 /*
3271                  * The tests for privacy and integrity must be first,
3272                  * since ND_GSS is set for everything but AUTH_SYS.
3273                  */
3274                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3275                     (nd->nd_flag & ND_GSSPRIVACY))
3276                         return (0);
3277                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3278                     (nd->nd_flag & ND_GSSINTEGRITY))
3279                         return (0);
3280                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3281                     (nd->nd_flag & ND_GSS))
3282                         return (0);
3283                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3284                     (nd->nd_flag & ND_GSS) == 0)
3285                         return (0);
3286         }
3287         return (1);
3288 }
3289
3290 /*
3291  * Calculate a hash value for the fid in a file handle.
3292  */
3293 uint32_t
3294 nfsrv_hashfh(fhandle_t *fhp)
3295 {
3296         uint32_t hashval;
3297
3298         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3299         return (hashval);
3300 }
3301
3302 /*
3303  * Calculate a hash value for the sessionid.
3304  */
3305 uint32_t
3306 nfsrv_hashsessionid(uint8_t *sessionid)
3307 {
3308         uint32_t hashval;
3309
3310         hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
3311         return (hashval);
3312 }
3313
3314 /*
3315  * Signal the userland master nfsd to backup the stable restart file.
3316  */
3317 void
3318 nfsrv_backupstable(void)
3319 {
3320         struct proc *procp;
3321
3322         if (nfsd_master_proc != NULL) {
3323                 procp = pfind(nfsd_master_pid);
3324                 /* Try to make sure it is the correct process. */
3325                 if (procp == nfsd_master_proc &&
3326                     procp->p_stats->p_start.tv_sec ==
3327                     nfsd_master_start.tv_sec &&
3328                     procp->p_stats->p_start.tv_usec ==
3329                     nfsd_master_start.tv_usec &&
3330                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
3331                         kern_psignal(procp, SIGUSR2);
3332                 else
3333                         nfsd_master_proc = NULL;
3334
3335                 if (procp != NULL)
3336                         PROC_UNLOCK(procp);
3337         }
3338 }
3339
3340 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3341
3342 /*
3343  * Called once to initialize data structures...
3344  */
3345 static int
3346 nfsd_modevent(module_t mod, int type, void *data)
3347 {
3348         int error = 0, i;
3349         static int loaded = 0;
3350
3351         switch (type) {
3352         case MOD_LOAD:
3353                 if (loaded)
3354                         goto out;
3355                 newnfs_portinit();
3356                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3357                         mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
3358                             MTX_DEF);
3359                         mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
3360                             MTX_DEF);
3361                 }
3362                 mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
3363                 mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
3364                 mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
3365                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3366                 nfsrvd_initcache();
3367                 nfsd_init();
3368                 NFSD_LOCK();
3369                 nfsrvd_init(0);
3370                 NFSD_UNLOCK();
3371                 nfsd_mntinit();
3372 #ifdef VV_DISABLEDELEG
3373                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3374                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3375 #endif
3376                 nfsd_call_servertimer = nfsrv_servertimer;
3377                 nfsd_call_nfsd = nfssvc_nfsd;
3378                 loaded = 1;
3379                 break;
3380
3381         case MOD_UNLOAD:
3382                 if (newnfs_numnfsd != 0) {
3383                         error = EBUSY;
3384                         break;
3385                 }
3386
3387 #ifdef VV_DISABLEDELEG
3388                 vn_deleg_ops.vndeleg_recall = NULL;
3389                 vn_deleg_ops.vndeleg_disable = NULL;
3390 #endif
3391                 nfsd_call_servertimer = NULL;
3392                 nfsd_call_nfsd = NULL;
3393
3394                 /* Clean out all NFSv4 state. */
3395                 nfsrv_throwawayallstate(curthread);
3396
3397                 /* Clean the NFS server reply cache */
3398                 nfsrvd_cleancache();
3399
3400                 /* Free up the krpc server pool. */
3401                 if (nfsrvd_pool != NULL)
3402                         svcpool_destroy(nfsrvd_pool);
3403
3404                 /* and get rid of the locks */
3405                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3406                         mtx_destroy(&nfsrchash_table[i].mtx);
3407                         mtx_destroy(&nfsrcahash_table[i].mtx);
3408                 }
3409                 mtx_destroy(&nfsrc_udpmtx);
3410                 mtx_destroy(&nfs_v4root_mutex);
3411                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3412                 for (i = 0; i < nfsrv_sessionhashsize; i++)
3413                         mtx_destroy(&nfssessionhash[i].mtx);
3414                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3415                 free(nfsclienthash, M_NFSDCLIENT);
3416                 free(nfslockhash, M_NFSDLOCKFILE);
3417                 free(nfssessionhash, M_NFSDSESSION);
3418                 loaded = 0;
3419                 break;
3420         default:
3421                 error = EOPNOTSUPP;
3422                 break;
3423         }
3424
3425 out:
3426         NFSEXITCODE(error);
3427         return (error);
3428 }
3429 static moduledata_t nfsd_mod = {
3430         "nfsd",
3431         nfsd_modevent,
3432         NULL,
3433 };
3434 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3435
3436 /* So that loader and kldload(2) can find us, wherever we are.. */
3437 MODULE_VERSION(nfsd, 1);
3438 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3439 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3440 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3441 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3442 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3443