sys/fs/nfsserver/nfs_nfsdport.c

   1 /*-
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rick Macklem at The University of Guelph.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  */
  33
  34 #include <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/capsicum.h>
  38
  39 /*
  40  * Functions that perform the vfs operations required by the routines in
  41  * nfsd_serv.c. It is hoped that this change will make the server more
  42  * portable.
  43  */
  44
  45 #include <fs/nfs/nfsport.h>
  46 #include <sys/hash.h>
  47 #include <sys/sysctl.h>
  48 #include <nlm/nlm_prot.h>
  49 #include <nlm/nlm.h>
  50
  51 FEATURE(nfsd, "NFSv4 server");
  52
  53 extern u_int32_t newnfs_true, newnfs_false, newnfs_xdrneg1;
  54 extern int nfsrv_useacl;
  55 extern int newnfs_numnfsd;
  56 extern struct mount nfsv4root_mnt;
  57 extern struct nfsrv_stablefirst nfsrv_stablefirst;
  58 extern void (*nfsd_call_servertimer)(void);
  59 extern SVCPOOL  *nfsrvd_pool;
  60 extern struct nfsv4lock nfsd_suspend_lock;
  61 extern struct nfsclienthashhead *nfsclienthash;
  62 extern struct nfslockhashhead *nfslockhash;
  63 extern struct nfssessionhash *nfssessionhash;
  64 extern int nfsrv_sessionhashsize;
  65 struct vfsoptlist nfsv4root_opt, nfsv4root_newopt;
  66 NFSDLOCKMUTEX;
  67 struct nfsrchash_bucket nfsrchash_table[NFSRVCACHE_HASHSIZE];
  68 struct nfsrchash_bucket nfsrcahash_table[NFSRVCACHE_HASHSIZE];
  69 struct mtx nfsrc_udpmtx;
  70 struct mtx nfs_v4root_mutex;
  71 struct nfsrvfh nfs_rootfh, nfs_pubfh;
  72 int nfs_pubfhset = 0, nfs_rootfhset = 0;
  73 struct proc *nfsd_master_proc = NULL;
  74 int nfsd_debuglevel = 0;
  75 static pid_t nfsd_master_pid = (pid_t)-1;
  76 static char nfsd_master_comm[MAXCOMLEN + 1];
  77 static struct timeval nfsd_master_start;
  78 static uint32_t nfsv4_sysid = 0;
  79
  80 static int nfssvc_srvcall(struct thread *, struct nfssvc_args *,
  81     struct ucred *);
  82
  83 int nfsrv_enable_crossmntpt = 1;
  84 static int nfs_commit_blks;
  85 static int nfs_commit_miss;
  86 extern int nfsrv_issuedelegs;
  87 extern int nfsrv_dolocallocks;
  88 extern int nfsd_enable_stringtouid;
  89
  90 SYSCTL_NODE(_vfs, OID_AUTO, nfsd, CTLFLAG_RW, 0, "New NFS server");
  91 SYSCTL_INT(_vfs_nfsd, OID_AUTO, mirrormnt, CTLFLAG_RW,
  92     &nfsrv_enable_crossmntpt, 0, "Enable nfsd to cross mount points");
  93 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_blks, CTLFLAG_RW, &nfs_commit_blks,
  94     0, "");
  95 SYSCTL_INT(_vfs_nfsd, OID_AUTO, commit_miss, CTLFLAG_RW, &nfs_commit_miss,
  96     0, "");
  97 SYSCTL_INT(_vfs_nfsd, OID_AUTO, issue_delegations, CTLFLAG_RW,
  98     &nfsrv_issuedelegs, 0, "Enable nfsd to issue delegations");
  99 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_locallocks, CTLFLAG_RW,
 100     &nfsrv_dolocallocks, 0, "Enable nfsd to acquire local locks on files");
 101 SYSCTL_INT(_vfs_nfsd, OID_AUTO, debuglevel, CTLFLAG_RW, &nfsd_debuglevel,
 102     0, "Debug level for new nfs server");
 103 SYSCTL_INT(_vfs_nfsd, OID_AUTO, enable_stringtouid, CTLFLAG_RW,
 104     &nfsd_enable_stringtouid, 0, "Enable nfsd to accept numeric owner_names");
 105
 106 #define MAX_REORDERED_RPC       16
 107 #define NUM_HEURISTIC           1031
 108 #define NHUSE_INIT              64
 109 #define NHUSE_INC               16
 110 #define NHUSE_MAX               2048
 111
 112 static struct nfsheur {
 113         struct vnode *nh_vp;    /* vp to match (unreferenced pointer) */
 114         off_t nh_nextoff;       /* next offset for sequential detection */
 115         int nh_use;             /* use count for selection */
 116         int nh_seqcount;        /* heuristic */
 117 } nfsheur[NUM_HEURISTIC];
 118
 119
 120 /*
 121  * Heuristic to detect sequential operation.
 122  */
 123 static struct nfsheur *
 124 nfsrv_sequential_heuristic(struct uio *uio, struct vnode *vp)
 125 {
 126         struct nfsheur *nh;
 127         int hi, try;
 128
 129         /* Locate best candidate. */
 130         try = 32;
 131         hi = ((int)(vm_offset_t)vp / sizeof(struct vnode)) % NUM_HEURISTIC;
 132         nh = &nfsheur[hi];
 133         while (try--) {
 134                 if (nfsheur[hi].nh_vp == vp) {
 135                         nh = &nfsheur[hi];
 136                         break;
 137                 }
 138                 if (nfsheur[hi].nh_use > 0)
 139                         --nfsheur[hi].nh_use;
 140                 hi = (hi + 1) % NUM_HEURISTIC;
 141                 if (nfsheur[hi].nh_use < nh->nh_use)
 142                         nh = &nfsheur[hi];
 143         }
 144
 145         /* Initialize hint if this is a new file. */
 146         if (nh->nh_vp != vp) {
 147                 nh->nh_vp = vp;
 148                 nh->nh_nextoff = uio->uio_offset;
 149                 nh->nh_use = NHUSE_INIT;
 150                 if (uio->uio_offset == 0)
 151                         nh->nh_seqcount = 4;
 152                 else
 153                         nh->nh_seqcount = 1;
 154         }
 155
 156         /* Calculate heuristic. */
 157         if ((uio->uio_offset == 0 && nh->nh_seqcount > 0) ||
 158             uio->uio_offset == nh->nh_nextoff) {
 159                 /* See comments in vfs_vnops.c:sequential_heuristic(). */
 160                 nh->nh_seqcount += howmany(uio->uio_resid, 16384);
 161                 if (nh->nh_seqcount > IO_SEQMAX)
 162                         nh->nh_seqcount = IO_SEQMAX;
 163         } else if (qabs(uio->uio_offset - nh->nh_nextoff) <= MAX_REORDERED_RPC *
 164             imax(vp->v_mount->mnt_stat.f_iosize, uio->uio_resid)) {
 165                 /* Probably a reordered RPC, leave seqcount alone. */
 166         } else if (nh->nh_seqcount > 1) {
 167                 nh->nh_seqcount /= 2;
 168         } else {
 169                 nh->nh_seqcount = 0;
 170         }
 171         nh->nh_use += NHUSE_INC;
 172         if (nh->nh_use > NHUSE_MAX)
 173                 nh->nh_use = NHUSE_MAX;
 174         return (nh);
 175 }
 176
 177 /*
 178  * Get attributes into nfsvattr structure.
 179  */
 180 int
 181 nfsvno_getattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 182     struct thread *p, int vpislocked)
 183 {
 184         int error, lockedit = 0;
 185
 186         if (vpislocked == 0) {
 187                 /*
 188                  * When vpislocked == 0, the vnode is either exclusively
 189                  * locked by this thread or not locked by this thread.
 190                  * As such, shared lock it, if not exclusively locked.
 191                  */
 192                 if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
 193                         lockedit = 1;
 194                         NFSVOPLOCK(vp, LK_SHARED | LK_RETRY);
 195                 }
 196         }
 197         error = VOP_GETATTR(vp, &nvap->na_vattr, cred);
 198         if (lockedit != 0)
 199                 NFSVOPUNLOCK(vp, 0);
 200
 201         NFSEXITCODE(error);
 202         return (error);
 203 }
 204
 205 /*
 206  * Get a file handle for a vnode.
 207  */
 208 int
 209 nfsvno_getfh(struct vnode *vp, fhandle_t *fhp, struct thread *p)
 210 {
 211         int error;
 212
 213         NFSBZERO((caddr_t)fhp, sizeof(fhandle_t));
 214         fhp->fh_fsid = vp->v_mount->mnt_stat.f_fsid;
 215         error = VOP_VPTOFH(vp, &fhp->fh_fid);
 216
 217         NFSEXITCODE(error);
 218         return (error);
 219 }
 220
 221 /*
 222  * Perform access checking for vnodes obtained from file handles that would
 223  * refer to files already opened by a Unix client. You cannot just use
 224  * vn_writechk() and VOP_ACCESSX() for two reasons.
 225  * 1 - You must check for exported rdonly as well as MNT_RDONLY for the write
 226  *     case.
 227  * 2 - The owner is to be given access irrespective of mode bits for some
 228  *     operations, so that processes that chmod after opening a file don't
 229  *     break.
 230  */
 231 int
 232 nfsvno_accchk(struct vnode *vp, accmode_t accmode, struct ucred *cred,
 233     struct nfsexstuff *exp, struct thread *p, int override, int vpislocked,
 234     u_int32_t *supportedtypep)
 235 {
 236         struct vattr vattr;
 237         int error = 0, getret = 0;
 238
 239         if (vpislocked == 0) {
 240                 if (NFSVOPLOCK(vp, LK_SHARED) != 0) {
 241                         error = EPERM;
 242                         goto out;
 243                 }
 244         }
 245         if (accmode & VWRITE) {
 246                 /* Just vn_writechk() changed to check rdonly */
 247                 /*
 248                  * Disallow write attempts on read-only file systems;
 249                  * unless the file is a socket or a block or character
 250                  * device resident on the file system.
 251                  */
 252                 if (NFSVNO_EXRDONLY(exp) ||
 253                     (vp->v_mount->mnt_flag & MNT_RDONLY)) {
 254                         switch (vp->v_type) {
 255                         case VREG:
 256                         case VDIR:
 257                         case VLNK:
 258                                 error = EROFS;
 259                         default:
 260                                 break;
 261                         }
 262                 }
 263                 /*
 264                  * If there's shared text associated with
 265                  * the inode, try to free it up once.  If
 266                  * we fail, we can't allow writing.
 267                  */
 268                 if (VOP_IS_TEXT(vp) && error == 0)
 269                         error = ETXTBSY;
 270         }
 271         if (error != 0) {
 272                 if (vpislocked == 0)
 273                         NFSVOPUNLOCK(vp, 0);
 274                 goto out;
 275         }
 276
 277         /*
 278          * Should the override still be applied when ACLs are enabled?
 279          */
 280         error = VOP_ACCESSX(vp, accmode, cred, p);
 281         if (error != 0 && (accmode & (VDELETE | VDELETE_CHILD))) {
 282                 /*
 283                  * Try again with VEXPLICIT_DENY, to see if the test for
 284                  * deletion is supported.
 285                  */
 286                 error = VOP_ACCESSX(vp, accmode | VEXPLICIT_DENY, cred, p);
 287                 if (error == 0) {
 288                         if (vp->v_type == VDIR) {
 289                                 accmode &= ~(VDELETE | VDELETE_CHILD);
 290                                 accmode |= VWRITE;
 291                                 error = VOP_ACCESSX(vp, accmode, cred, p);
 292                         } else if (supportedtypep != NULL) {
 293                                 *supportedtypep &= ~NFSACCESS_DELETE;
 294                         }
 295                 }
 296         }
 297
 298         /*
 299          * Allow certain operations for the owner (reads and writes
 300          * on files that are already open).
 301          */
 302         if (override != NFSACCCHK_NOOVERRIDE &&
 303             (error == EPERM || error == EACCES)) {
 304                 if (cred->cr_uid == 0 && (override & NFSACCCHK_ALLOWROOT))
 305                         error = 0;
 306                 else if (override & NFSACCCHK_ALLOWOWNER) {
 307                         getret = VOP_GETATTR(vp, &vattr, cred);
 308                         if (getret == 0 && cred->cr_uid == vattr.va_uid)
 309                                 error = 0;
 310                 }
 311         }
 312         if (vpislocked == 0)
 313                 NFSVOPUNLOCK(vp, 0);
 314
 315 out:
 316         NFSEXITCODE(error);
 317         return (error);
 318 }
 319
 320 /*
 321  * Set attribute(s) vnop.
 322  */
 323 int
 324 nfsvno_setattr(struct vnode *vp, struct nfsvattr *nvap, struct ucred *cred,
 325     struct thread *p, struct nfsexstuff *exp)
 326 {
 327         int error;
 328
 329         error = VOP_SETATTR(vp, &nvap->na_vattr, cred);
 330         NFSEXITCODE(error);
 331         return (error);
 332 }
 333
 334 /*
 335  * Set up nameidata for a lookup() call and do it.
 336  */
 337 int
 338 nfsvno_namei(struct nfsrv_descript *nd, struct nameidata *ndp,
 339     struct vnode *dp, int islocked, struct nfsexstuff *exp, struct thread *p,
 340     struct vnode **retdirp)
 341 {
 342         struct componentname *cnp = &ndp->ni_cnd;
 343         int i;
 344         struct iovec aiov;
 345         struct uio auio;
 346         int lockleaf = (cnp->cn_flags & LOCKLEAF) != 0, linklen;
 347         int error = 0, crossmnt;
 348         char *cp;
 349
 350         *retdirp = NULL;
 351         cnp->cn_nameptr = cnp->cn_pnbuf;
 352         ndp->ni_strictrelative = 0;
 353         /*
 354          * Extract and set starting directory.
 355          */
 356         if (dp->v_type != VDIR) {
 357                 if (islocked)
 358                         vput(dp);
 359                 else
 360                         vrele(dp);
 361                 nfsvno_relpathbuf(ndp);
 362                 error = ENOTDIR;
 363                 goto out1;
 364         }
 365         if (islocked)
 366                 NFSVOPUNLOCK(dp, 0);
 367         VREF(dp);
 368         *retdirp = dp;
 369         if (NFSVNO_EXRDONLY(exp))
 370                 cnp->cn_flags |= RDONLY;
 371         ndp->ni_segflg = UIO_SYSSPACE;
 372         crossmnt = 1;
 373
 374         if (nd->nd_flag & ND_PUBLOOKUP) {
 375                 ndp->ni_loopcnt = 0;
 376                 if (cnp->cn_pnbuf[0] == '/') {
 377                         vrele(dp);
 378                         /*
 379                          * Check for degenerate pathnames here, since lookup()
 380                          * panics on them.
 381                          */
 382                         for (i = 1; i < ndp->ni_pathlen; i++)
 383                                 if (cnp->cn_pnbuf[i] != '/')
 384                                         break;
 385                         if (i == ndp->ni_pathlen) {
 386                                 error = NFSERR_ACCES;
 387                                 goto out;
 388                         }
 389                         dp = rootvnode;
 390                         VREF(dp);
 391                 }
 392         } else if ((nfsrv_enable_crossmntpt == 0 && NFSVNO_EXPORTED(exp)) ||
 393             (nd->nd_flag & ND_NFSV4) == 0) {
 394                 /*
 395                  * Only cross mount points for NFSv4 when doing a
 396                  * mount while traversing the file system above
 397                  * the mount point, unless nfsrv_enable_crossmntpt is set.
 398                  */
 399                 cnp->cn_flags |= NOCROSSMOUNT;
 400                 crossmnt = 0;
 401         }
 402
 403         /*
 404          * Initialize for scan, set ni_startdir and bump ref on dp again
 405          * because lookup() will dereference ni_startdir.
 406          */
 407
 408         cnp->cn_thread = p;
 409         ndp->ni_startdir = dp;
 410         ndp->ni_rootdir = rootvnode;
 411         ndp->ni_topdir = NULL;
 412
 413         if (!lockleaf)
 414                 cnp->cn_flags |= LOCKLEAF;
 415         for (;;) {
 416                 cnp->cn_nameptr = cnp->cn_pnbuf;
 417                 /*
 418                  * Call lookup() to do the real work.  If an error occurs,
 419                  * ndp->ni_vp and ni_dvp are left uninitialized or NULL and
 420                  * we do not have to dereference anything before returning.
 421                  * In either case ni_startdir will be dereferenced and NULLed
 422                  * out.
 423                  */
 424                 error = lookup(ndp);
 425                 if (error)
 426                         break;
 427
 428                 /*
 429                  * Check for encountering a symbolic link.  Trivial
 430                  * termination occurs if no symlink encountered.
 431                  */
 432                 if ((cnp->cn_flags & ISSYMLINK) == 0) {
 433                         if ((cnp->cn_flags & (SAVENAME | SAVESTART)) == 0)
 434                                 nfsvno_relpathbuf(ndp);
 435                         if (ndp->ni_vp && !lockleaf)
 436                                 NFSVOPUNLOCK(ndp->ni_vp, 0);
 437                         break;
 438                 }
 439
 440                 /*
 441                  * Validate symlink
 442                  */
 443                 if ((cnp->cn_flags & LOCKPARENT) && ndp->ni_pathlen == 1)
 444                         NFSVOPUNLOCK(ndp->ni_dvp, 0);
 445                 if (!(nd->nd_flag & ND_PUBLOOKUP)) {
 446                         error = EINVAL;
 447                         goto badlink2;
 448                 }
 449
 450                 if (ndp->ni_loopcnt++ >= MAXSYMLINKS) {
 451                         error = ELOOP;
 452                         goto badlink2;
 453                 }
 454                 if (ndp->ni_pathlen > 1)
 455                         cp = uma_zalloc(namei_zone, M_WAITOK);
 456                 else
 457                         cp = cnp->cn_pnbuf;
 458                 aiov.iov_base = cp;
 459                 aiov.iov_len = MAXPATHLEN;
 460                 auio.uio_iov = &aiov;
 461                 auio.uio_iovcnt = 1;
 462                 auio.uio_offset = 0;
 463                 auio.uio_rw = UIO_READ;
 464                 auio.uio_segflg = UIO_SYSSPACE;
 465                 auio.uio_td = NULL;
 466                 auio.uio_resid = MAXPATHLEN;
 467                 error = VOP_READLINK(ndp->ni_vp, &auio, cnp->cn_cred);
 468                 if (error) {
 469                 badlink1:
 470                         if (ndp->ni_pathlen > 1)
 471                                 uma_zfree(namei_zone, cp);
 472                 badlink2:
 473                         vrele(ndp->ni_dvp);
 474                         vput(ndp->ni_vp);
 475                         break;
 476                 }
 477                 linklen = MAXPATHLEN - auio.uio_resid;
 478                 if (linklen == 0) {
 479                         error = ENOENT;
 480                         goto badlink1;
 481                 }
 482                 if (linklen + ndp->ni_pathlen >= MAXPATHLEN) {
 483                         error = ENAMETOOLONG;
 484                         goto badlink1;
 485                 }
 486
 487                 /*
 488                  * Adjust or replace path
 489                  */
 490                 if (ndp->ni_pathlen > 1) {
 491                         NFSBCOPY(ndp->ni_next, cp + linklen, ndp->ni_pathlen);
 492                         uma_zfree(namei_zone, cnp->cn_pnbuf);
 493                         cnp->cn_pnbuf = cp;
 494                 } else
 495                         cnp->cn_pnbuf[linklen] = '\0';
 496                 ndp->ni_pathlen += linklen;
 497
 498                 /*
 499                  * Cleanup refs for next loop and check if root directory
 500                  * should replace current directory.  Normally ni_dvp
 501                  * becomes the new base directory and is cleaned up when
 502                  * we loop.  Explicitly null pointers after invalidation
 503                  * to clarify operation.
 504                  */
 505                 vput(ndp->ni_vp);
 506                 ndp->ni_vp = NULL;
 507
 508                 if (cnp->cn_pnbuf[0] == '/') {
 509                         vrele(ndp->ni_dvp);
 510                         ndp->ni_dvp = ndp->ni_rootdir;
 511                         VREF(ndp->ni_dvp);
 512                 }
 513                 ndp->ni_startdir = ndp->ni_dvp;
 514                 ndp->ni_dvp = NULL;
 515         }
 516         if (!lockleaf)
 517                 cnp->cn_flags &= ~LOCKLEAF;
 518
 519 out:
 520         if (error) {
 521                 nfsvno_relpathbuf(ndp);
 522                 ndp->ni_vp = NULL;
 523                 ndp->ni_dvp = NULL;
 524                 ndp->ni_startdir = NULL;
 525         } else if ((ndp->ni_cnd.cn_flags & (WANTPARENT|LOCKPARENT)) == 0) {
 526                 ndp->ni_dvp = NULL;
 527         }
 528
 529 out1:
 530         NFSEXITCODE2(error, nd);
 531         return (error);
 532 }
 533
 534 /*
 535  * Set up a pathname buffer and return a pointer to it and, optionally
 536  * set a hash pointer.
 537  */
 538 void
 539 nfsvno_setpathbuf(struct nameidata *ndp, char **bufpp, u_long **hashpp)
 540 {
 541         struct componentname *cnp = &ndp->ni_cnd;
 542
 543         cnp->cn_flags |= (NOMACCHECK | HASBUF);
 544         cnp->cn_pnbuf = uma_zalloc(namei_zone, M_WAITOK);
 545         if (hashpp != NULL)
 546                 *hashpp = NULL;
 547         *bufpp = cnp->cn_pnbuf;
 548 }
 549
 550 /*
 551  * Release the above path buffer, if not released by nfsvno_namei().
 552  */
 553 void
 554 nfsvno_relpathbuf(struct nameidata *ndp)
 555 {
 556
 557         if ((ndp->ni_cnd.cn_flags & HASBUF) == 0)
 558                 panic("nfsrelpath");
 559         uma_zfree(namei_zone, ndp->ni_cnd.cn_pnbuf);
 560         ndp->ni_cnd.cn_flags &= ~HASBUF;
 561 }
 562
 563 /*
 564  * Readlink vnode op into an mbuf list.
 565  */
 566 int
 567 nfsvno_readlink(struct vnode *vp, struct ucred *cred, struct thread *p,
 568     struct mbuf **mpp, struct mbuf **mpendp, int *lenp)
 569 {
 570         struct iovec iv[(NFS_MAXPATHLEN+MLEN-1)/MLEN];
 571         struct iovec *ivp = iv;
 572         struct uio io, *uiop = &io;
 573         struct mbuf *mp, *mp2 = NULL, *mp3 = NULL;
 574         int i, len, tlen, error = 0;
 575
 576         len = 0;
 577         i = 0;
 578         while (len < NFS_MAXPATHLEN) {
 579                 NFSMGET(mp);
 580                 MCLGET(mp, M_WAITOK);
 581                 mp->m_len = NFSMSIZ(mp);
 582                 if (len == 0) {
 583                         mp3 = mp2 = mp;
 584                 } else {
 585                         mp2->m_next = mp;
 586                         mp2 = mp;
 587                 }
 588                 if ((len + mp->m_len) > NFS_MAXPATHLEN) {
 589                         mp->m_len = NFS_MAXPATHLEN - len;
 590                         len = NFS_MAXPATHLEN;
 591                 } else {
 592                         len += mp->m_len;
 593                 }
 594                 ivp->iov_base = mtod(mp, caddr_t);
 595                 ivp->iov_len = mp->m_len;
 596                 i++;
 597                 ivp++;
 598         }
 599         uiop->uio_iov = iv;
 600         uiop->uio_iovcnt = i;
 601         uiop->uio_offset = 0;
 602         uiop->uio_resid = len;
 603         uiop->uio_rw = UIO_READ;
 604         uiop->uio_segflg = UIO_SYSSPACE;
 605         uiop->uio_td = NULL;
 606         error = VOP_READLINK(vp, uiop, cred);
 607         if (error) {
 608                 m_freem(mp3);
 609                 *lenp = 0;
 610                 goto out;
 611         }
 612         if (uiop->uio_resid > 0) {
 613                 len -= uiop->uio_resid;
 614                 tlen = NFSM_RNDUP(len);
 615                 nfsrv_adj(mp3, NFS_MAXPATHLEN - tlen, tlen - len);
 616         }
 617         *lenp = len;
 618         *mpp = mp3;
 619         *mpendp = mp;
 620
 621 out:
 622         NFSEXITCODE(error);
 623         return (error);
 624 }
 625
 626 /*
 627  * Read vnode op call into mbuf list.
 628  */
 629 int
 630 nfsvno_read(struct vnode *vp, off_t off, int cnt, struct ucred *cred,
 631     struct thread *p, struct mbuf **mpp, struct mbuf **mpendp)
 632 {
 633         struct mbuf *m;
 634         int i;
 635         struct iovec *iv;
 636         struct iovec *iv2;
 637         int error = 0, len, left, siz, tlen, ioflag = 0;
 638         struct mbuf *m2 = NULL, *m3;
 639         struct uio io, *uiop = &io;
 640         struct nfsheur *nh;
 641
 642         len = left = NFSM_RNDUP(cnt);
 643         m3 = NULL;
 644         /*
 645          * Generate the mbuf list with the uio_iov ref. to it.
 646          */
 647         i = 0;
 648         while (left > 0) {
 649                 NFSMGET(m);
 650                 MCLGET(m, M_WAITOK);
 651                 m->m_len = 0;
 652                 siz = min(M_TRAILINGSPACE(m), left);
 653                 left -= siz;
 654                 i++;
 655                 if (m3)
 656                         m2->m_next = m;
 657                 else
 658                         m3 = m;
 659                 m2 = m;
 660         }
 661         MALLOC(iv, struct iovec *, i * sizeof (struct iovec),
 662             M_TEMP, M_WAITOK);
 663         uiop->uio_iov = iv2 = iv;
 664         m = m3;
 665         left = len;
 666         i = 0;
 667         while (left > 0) {
 668                 if (m == NULL)
 669                         panic("nfsvno_read iov");
 670                 siz = min(M_TRAILINGSPACE(m), left);
 671                 if (siz > 0) {
 672                         iv->iov_base = mtod(m, caddr_t) + m->m_len;
 673                         iv->iov_len = siz;
 674                         m->m_len += siz;
 675                         left -= siz;
 676                         iv++;
 677                         i++;
 678                 }
 679                 m = m->m_next;
 680         }
 681         uiop->uio_iovcnt = i;
 682         uiop->uio_offset = off;
 683         uiop->uio_resid = len;
 684         uiop->uio_rw = UIO_READ;
 685         uiop->uio_segflg = UIO_SYSSPACE;
 686         uiop->uio_td = NULL;
 687         nh = nfsrv_sequential_heuristic(uiop, vp);
 688         ioflag |= nh->nh_seqcount << IO_SEQSHIFT;
 689         error = VOP_READ(vp, uiop, IO_NODELOCKED | ioflag, cred);
 690         FREE((caddr_t)iv2, M_TEMP);
 691         if (error) {
 692                 m_freem(m3);
 693                 *mpp = NULL;
 694                 goto out;
 695         }
 696         nh->nh_nextoff = uiop->uio_offset;
 697         tlen = len - uiop->uio_resid;
 698         cnt = cnt < tlen ? cnt : tlen;
 699         tlen = NFSM_RNDUP(cnt);
 700         if (tlen == 0) {
 701                 m_freem(m3);
 702                 m3 = NULL;
 703         } else if (len != tlen || tlen != cnt)
 704                 nfsrv_adj(m3, len - tlen, tlen - cnt);
 705         *mpp = m3;
 706         *mpendp = m2;
 707
 708 out:
 709         NFSEXITCODE(error);
 710         return (error);
 711 }
 712
 713 /*
 714  * Write vnode op from an mbuf list.
 715  */
 716 int
 717 nfsvno_write(struct vnode *vp, off_t off, int retlen, int cnt, int stable,
 718     struct mbuf *mp, char *cp, struct ucred *cred, struct thread *p)
 719 {
 720         struct iovec *ivp;
 721         int i, len;
 722         struct iovec *iv;
 723         int ioflags, error;
 724         struct uio io, *uiop = &io;
 725         struct nfsheur *nh;
 726
 727         MALLOC(ivp, struct iovec *, cnt * sizeof (struct iovec), M_TEMP,
 728             M_WAITOK);
 729         uiop->uio_iov = iv = ivp;
 730         uiop->uio_iovcnt = cnt;
 731         i = mtod(mp, caddr_t) + mp->m_len - cp;
 732         len = retlen;
 733         while (len > 0) {
 734                 if (mp == NULL)
 735                         panic("nfsvno_write");
 736                 if (i > 0) {
 737                         i = min(i, len);
 738                         ivp->iov_base = cp;
 739                         ivp->iov_len = i;
 740                         ivp++;
 741                         len -= i;
 742                 }
 743                 mp = mp->m_next;
 744                 if (mp) {
 745                         i = mp->m_len;
 746                         cp = mtod(mp, caddr_t);
 747                 }
 748         }
 749
 750         if (stable == NFSWRITE_UNSTABLE)
 751                 ioflags = IO_NODELOCKED;
 752         else
 753                 ioflags = (IO_SYNC | IO_NODELOCKED);
 754         uiop->uio_resid = retlen;
 755         uiop->uio_rw = UIO_WRITE;
 756         uiop->uio_segflg = UIO_SYSSPACE;
 757         NFSUIOPROC(uiop, p);
 758         uiop->uio_offset = off;
 759         nh = nfsrv_sequential_heuristic(uiop, vp);
 760         ioflags |= nh->nh_seqcount << IO_SEQSHIFT;
 761         error = VOP_WRITE(vp, uiop, ioflags, cred);
 762         if (error == 0)
 763                 nh->nh_nextoff = uiop->uio_offset;
 764         FREE((caddr_t)iv, M_TEMP);
 765
 766         NFSEXITCODE(error);
 767         return (error);
 768 }
 769
 770 /*
 771  * Common code for creating a regular file (plus special files for V2).
 772  */
 773 int
 774 nfsvno_createsub(struct nfsrv_descript *nd, struct nameidata *ndp,
 775     struct vnode **vpp, struct nfsvattr *nvap, int *exclusive_flagp,
 776     int32_t *cverf, NFSDEV_T rdev, struct thread *p, struct nfsexstuff *exp)
 777 {
 778         u_quad_t tempsize;
 779         int error;
 780
 781         error = nd->nd_repstat;
 782         if (!error && ndp->ni_vp == NULL) {
 783                 if (nvap->na_type == VREG || nvap->na_type == VSOCK) {
 784                         vrele(ndp->ni_startdir);
 785                         error = VOP_CREATE(ndp->ni_dvp,
 786                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
 787                         vput(ndp->ni_dvp);
 788                         nfsvno_relpathbuf(ndp);
 789                         if (!error) {
 790                                 if (*exclusive_flagp) {
 791                                         *exclusive_flagp = 0;
 792                                         NFSVNO_ATTRINIT(nvap);
 793                                         nvap->na_atime.tv_sec = cverf[0];
 794                                         nvap->na_atime.tv_nsec = cverf[1];
 795                                         error = VOP_SETATTR(ndp->ni_vp,
 796                                             &nvap->na_vattr, nd->nd_cred);
 797                                 }
 798                         }
 799                 /*
 800                  * NFS V2 Only. nfsrvd_mknod() does this for V3.
 801                  * (This implies, just get out on an error.)
 802                  */
 803                 } else if (nvap->na_type == VCHR || nvap->na_type == VBLK ||
 804                         nvap->na_type == VFIFO) {
 805                         if (nvap->na_type == VCHR && rdev == 0xffffffff)
 806                                 nvap->na_type = VFIFO;
 807                         if (nvap->na_type != VFIFO &&
 808                             (error = priv_check_cred(nd->nd_cred,
 809                              PRIV_VFS_MKNOD_DEV, 0))) {
 810                                 vrele(ndp->ni_startdir);
 811                                 nfsvno_relpathbuf(ndp);
 812                                 vput(ndp->ni_dvp);
 813                                 goto out;
 814                         }
 815                         nvap->na_rdev = rdev;
 816                         error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 817                             &ndp->ni_cnd, &nvap->na_vattr);
 818                         vput(ndp->ni_dvp);
 819                         nfsvno_relpathbuf(ndp);
 820                         vrele(ndp->ni_startdir);
 821                         if (error)
 822                                 goto out;
 823                 } else {
 824                         vrele(ndp->ni_startdir);
 825                         nfsvno_relpathbuf(ndp);
 826                         vput(ndp->ni_dvp);
 827                         error = ENXIO;
 828                         goto out;
 829                 }
 830                 *vpp = ndp->ni_vp;
 831         } else {
 832                 /*
 833                  * Handle cases where error is already set and/or
 834                  * the file exists.
 835                  * 1 - clean up the lookup
 836                  * 2 - iff !error and na_size set, truncate it
 837                  */
 838                 vrele(ndp->ni_startdir);
 839                 nfsvno_relpathbuf(ndp);
 840                 *vpp = ndp->ni_vp;
 841                 if (ndp->ni_dvp == *vpp)
 842                         vrele(ndp->ni_dvp);
 843                 else
 844                         vput(ndp->ni_dvp);
 845                 if (!error && nvap->na_size != VNOVAL) {
 846                         error = nfsvno_accchk(*vpp, VWRITE,
 847                             nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
 848                             NFSACCCHK_VPISLOCKED, NULL);
 849                         if (!error) {
 850                                 tempsize = nvap->na_size;
 851                                 NFSVNO_ATTRINIT(nvap);
 852                                 nvap->na_size = tempsize;
 853                                 error = VOP_SETATTR(*vpp,
 854                                     &nvap->na_vattr, nd->nd_cred);
 855                         }
 856                 }
 857                 if (error)
 858                         vput(*vpp);
 859         }
 860
 861 out:
 862         NFSEXITCODE(error);
 863         return (error);
 864 }
 865
 866 /*
 867  * Do a mknod vnode op.
 868  */
 869 int
 870 nfsvno_mknod(struct nameidata *ndp, struct nfsvattr *nvap, struct ucred *cred,
 871     struct thread *p)
 872 {
 873         int error = 0;
 874         enum vtype vtyp;
 875
 876         vtyp = nvap->na_type;
 877         /*
 878          * Iff doesn't exist, create it.
 879          */
 880         if (ndp->ni_vp) {
 881                 vrele(ndp->ni_startdir);
 882                 nfsvno_relpathbuf(ndp);
 883                 vput(ndp->ni_dvp);
 884                 vrele(ndp->ni_vp);
 885                 error = EEXIST;
 886                 goto out;
 887         }
 888         if (vtyp != VCHR && vtyp != VBLK && vtyp != VSOCK && vtyp != VFIFO) {
 889                 vrele(ndp->ni_startdir);
 890                 nfsvno_relpathbuf(ndp);
 891                 vput(ndp->ni_dvp);
 892                 error = NFSERR_BADTYPE;
 893                 goto out;
 894         }
 895         if (vtyp == VSOCK) {
 896                 vrele(ndp->ni_startdir);
 897                 error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp,
 898                     &ndp->ni_cnd, &nvap->na_vattr);
 899                 vput(ndp->ni_dvp);
 900                 nfsvno_relpathbuf(ndp);
 901         } else {
 902                 if (nvap->na_type != VFIFO &&
 903                     (error = priv_check_cred(cred, PRIV_VFS_MKNOD_DEV, 0))) {
 904                         vrele(ndp->ni_startdir);
 905                         nfsvno_relpathbuf(ndp);
 906                         vput(ndp->ni_dvp);
 907                         goto out;
 908                 }
 909                 error = VOP_MKNOD(ndp->ni_dvp, &ndp->ni_vp,
 910                     &ndp->ni_cnd, &nvap->na_vattr);
 911                 vput(ndp->ni_dvp);
 912                 nfsvno_relpathbuf(ndp);
 913                 vrele(ndp->ni_startdir);
 914                 /*
 915                  * Since VOP_MKNOD returns the ni_vp, I can't
 916                  * see any reason to do the lookup.
 917                  */
 918         }
 919
 920 out:
 921         NFSEXITCODE(error);
 922         return (error);
 923 }
 924
 925 /*
 926  * Mkdir vnode op.
 927  */
 928 int
 929 nfsvno_mkdir(struct nameidata *ndp, struct nfsvattr *nvap, uid_t saved_uid,
 930     struct ucred *cred, struct thread *p, struct nfsexstuff *exp)
 931 {
 932         int error = 0;
 933
 934         if (ndp->ni_vp != NULL) {
 935                 if (ndp->ni_dvp == ndp->ni_vp)
 936                         vrele(ndp->ni_dvp);
 937                 else
 938                         vput(ndp->ni_dvp);
 939                 vrele(ndp->ni_vp);
 940                 nfsvno_relpathbuf(ndp);
 941                 error = EEXIST;
 942                 goto out;
 943         }
 944         error = VOP_MKDIR(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 945             &nvap->na_vattr);
 946         vput(ndp->ni_dvp);
 947         nfsvno_relpathbuf(ndp);
 948
 949 out:
 950         NFSEXITCODE(error);
 951         return (error);
 952 }
 953
 954 /*
 955  * symlink vnode op.
 956  */
 957 int
 958 nfsvno_symlink(struct nameidata *ndp, struct nfsvattr *nvap, char *pathcp,
 959     int pathlen, int not_v2, uid_t saved_uid, struct ucred *cred, struct thread *p,
 960     struct nfsexstuff *exp)
 961 {
 962         int error = 0;
 963
 964         if (ndp->ni_vp) {
 965                 vrele(ndp->ni_startdir);
 966                 nfsvno_relpathbuf(ndp);
 967                 if (ndp->ni_dvp == ndp->ni_vp)
 968                         vrele(ndp->ni_dvp);
 969                 else
 970                         vput(ndp->ni_dvp);
 971                 vrele(ndp->ni_vp);
 972                 error = EEXIST;
 973                 goto out;
 974         }
 975
 976         error = VOP_SYMLINK(ndp->ni_dvp, &ndp->ni_vp, &ndp->ni_cnd,
 977             &nvap->na_vattr, pathcp);
 978         vput(ndp->ni_dvp);
 979         vrele(ndp->ni_startdir);
 980         nfsvno_relpathbuf(ndp);
 981         /*
 982          * Although FreeBSD still had the lookup code in
 983          * it for 7/current, there doesn't seem to be any
 984          * point, since VOP_SYMLINK() returns the ni_vp.
 985          * Just vput it for v2.
 986          */
 987         if (!not_v2 && !error)
 988                 vput(ndp->ni_vp);
 989
 990 out:
 991         NFSEXITCODE(error);
 992         return (error);
 993 }
 994
 995 /*
 996  * Parse symbolic link arguments.
 997  * This function has an ugly side effect. It will MALLOC() an area for
 998  * the symlink and set iov_base to point to it, only if it succeeds.
 999  * So, if it returns with uiop->uio_iov->iov_base != NULL, that must
1000  * be FREE'd later.
1001  */
1002 int
1003 nfsvno_getsymlink(struct nfsrv_descript *nd, struct nfsvattr *nvap,
1004     struct thread *p, char **pathcpp, int *lenp)
1005 {
1006         u_int32_t *tl;
1007         char *pathcp = NULL;
1008         int error = 0, len;
1009         struct nfsv2_sattr *sp;
1010
1011         *pathcpp = NULL;
1012         *lenp = 0;
1013         if ((nd->nd_flag & ND_NFSV3) &&
1014             (error = nfsrv_sattr(nd, nvap, NULL, NULL, p)))
1015                 goto nfsmout;
1016         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
1017         len = fxdr_unsigned(int, *tl);
1018         if (len > NFS_MAXPATHLEN || len <= 0) {
1019                 error = EBADRPC;
1020                 goto nfsmout;
1021         }
1022         MALLOC(pathcp, caddr_t, len + 1, M_TEMP, M_WAITOK);
1023         error = nfsrv_mtostr(nd, pathcp, len);
1024         if (error)
1025                 goto nfsmout;
1026         if (nd->nd_flag & ND_NFSV2) {
1027                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
1028                 nvap->na_mode = fxdr_unsigned(u_int16_t, sp->sa_mode);
1029         }
1030         *pathcpp = pathcp;
1031         *lenp = len;
1032         NFSEXITCODE2(0, nd);
1033         return (0);
1034 nfsmout:
1035         if (pathcp)
1036                 free(pathcp, M_TEMP);
1037         NFSEXITCODE2(error, nd);
1038         return (error);
1039 }
1040
1041 /*
1042  * Remove a non-directory object.
1043  */
1044 int
1045 nfsvno_removesub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1046     struct thread *p, struct nfsexstuff *exp)
1047 {
1048         struct vnode *vp;
1049         int error = 0;
1050
1051         vp = ndp->ni_vp;
1052         if (vp->v_type == VDIR)
1053                 error = NFSERR_ISDIR;
1054         else if (is_v4)
1055                 error = nfsrv_checkremove(vp, 1, p);
1056         if (!error)
1057                 error = VOP_REMOVE(ndp->ni_dvp, vp, &ndp->ni_cnd);
1058         if (ndp->ni_dvp == vp)
1059                 vrele(ndp->ni_dvp);
1060         else
1061                 vput(ndp->ni_dvp);
1062         vput(vp);
1063         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1064                 nfsvno_relpathbuf(ndp);
1065         NFSEXITCODE(error);
1066         return (error);
1067 }
1068
1069 /*
1070  * Remove a directory.
1071  */
1072 int
1073 nfsvno_rmdirsub(struct nameidata *ndp, int is_v4, struct ucred *cred,
1074     struct thread *p, struct nfsexstuff *exp)
1075 {
1076         struct vnode *vp;
1077         int error = 0;
1078
1079         vp = ndp->ni_vp;
1080         if (vp->v_type != VDIR) {
1081                 error = ENOTDIR;
1082                 goto out;
1083         }
1084         /*
1085          * No rmdir "." please.
1086          */
1087         if (ndp->ni_dvp == vp) {
1088                 error = EINVAL;
1089                 goto out;
1090         }
1091         /*
1092          * The root of a mounted filesystem cannot be deleted.
1093          */
1094         if (vp->v_vflag & VV_ROOT)
1095                 error = EBUSY;
1096 out:
1097         if (!error)
1098                 error = VOP_RMDIR(ndp->ni_dvp, vp, &ndp->ni_cnd);
1099         if (ndp->ni_dvp == vp)
1100                 vrele(ndp->ni_dvp);
1101         else
1102                 vput(ndp->ni_dvp);
1103         vput(vp);
1104         if ((ndp->ni_cnd.cn_flags & SAVENAME) != 0)
1105                 nfsvno_relpathbuf(ndp);
1106         NFSEXITCODE(error);
1107         return (error);
1108 }
1109
1110 /*
1111  * Rename vnode op.
1112  */
1113 int
1114 nfsvno_rename(struct nameidata *fromndp, struct nameidata *tondp,
1115     u_int32_t ndstat, u_int32_t ndflag, struct ucred *cred, struct thread *p)
1116 {
1117         struct vnode *fvp, *tvp, *tdvp;
1118         int error = 0;
1119
1120         fvp = fromndp->ni_vp;
1121         if (ndstat) {
1122                 vrele(fromndp->ni_dvp);
1123                 vrele(fvp);
1124                 error = ndstat;
1125                 goto out1;
1126         }
1127         tdvp = tondp->ni_dvp;
1128         tvp = tondp->ni_vp;
1129         if (tvp != NULL) {
1130                 if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
1131                         error = (ndflag & ND_NFSV2) ? EISDIR : EEXIST;
1132                         goto out;
1133                 } else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
1134                         error = (ndflag & ND_NFSV2) ? ENOTDIR : EEXIST;
1135                         goto out;
1136                 }
1137                 if (tvp->v_type == VDIR && tvp->v_mountedhere) {
1138                         error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1139                         goto out;
1140                 }
1141
1142                 /*
1143                  * A rename to '.' or '..' results in a prematurely
1144                  * unlocked vnode on FreeBSD5, so I'm just going to fail that
1145                  * here.
1146                  */
1147                 if ((tondp->ni_cnd.cn_namelen == 1 &&
1148                      tondp->ni_cnd.cn_nameptr[0] == '.') ||
1149                     (tondp->ni_cnd.cn_namelen == 2 &&
1150                      tondp->ni_cnd.cn_nameptr[0] == '.' &&
1151                      tondp->ni_cnd.cn_nameptr[1] == '.')) {
1152                         error = EINVAL;
1153                         goto out;
1154                 }
1155         }
1156         if (fvp->v_type == VDIR && fvp->v_mountedhere) {
1157                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1158                 goto out;
1159         }
1160         if (fvp->v_mount != tdvp->v_mount) {
1161                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EXDEV;
1162                 goto out;
1163         }
1164         if (fvp == tdvp) {
1165                 error = (ndflag & ND_NFSV2) ? ENOTEMPTY : EINVAL;
1166                 goto out;
1167         }
1168         if (fvp == tvp) {
1169                 /*
1170                  * If source and destination are the same, there is nothing to
1171                  * do. Set error to -1 to indicate this.
1172                  */
1173                 error = -1;
1174                 goto out;
1175         }
1176         if (ndflag & ND_NFSV4) {
1177                 if (NFSVOPLOCK(fvp, LK_EXCLUSIVE) == 0) {
1178                         error = nfsrv_checkremove(fvp, 0, p);
1179                         NFSVOPUNLOCK(fvp, 0);
1180                 } else
1181                         error = EPERM;
1182                 if (tvp && !error)
1183                         error = nfsrv_checkremove(tvp, 1, p);
1184         } else {
1185                 /*
1186                  * For NFSv2 and NFSv3, try to get rid of the delegation, so
1187                  * that the NFSv4 client won't be confused by the rename.
1188                  * Since nfsd_recalldelegation() can only be called on an
1189                  * unlocked vnode at this point and fvp is the file that will
1190                  * still exist after the rename, just do fvp.
1191                  */
1192                 nfsd_recalldelegation(fvp, p);
1193         }
1194 out:
1195         if (!error) {
1196                 error = VOP_RENAME(fromndp->ni_dvp, fromndp->ni_vp,
1197                     &fromndp->ni_cnd, tondp->ni_dvp, tondp->ni_vp,
1198                     &tondp->ni_cnd);
1199         } else {
1200                 if (tdvp == tvp)
1201                         vrele(tdvp);
1202                 else
1203                         vput(tdvp);
1204                 if (tvp)
1205                         vput(tvp);
1206                 vrele(fromndp->ni_dvp);
1207                 vrele(fvp);
1208                 if (error == -1)
1209                         error = 0;
1210         }
1211         vrele(tondp->ni_startdir);
1212         nfsvno_relpathbuf(tondp);
1213 out1:
1214         vrele(fromndp->ni_startdir);
1215         nfsvno_relpathbuf(fromndp);
1216         NFSEXITCODE(error);
1217         return (error);
1218 }
1219
1220 /*
1221  * Link vnode op.
1222  */
1223 int
1224 nfsvno_link(struct nameidata *ndp, struct vnode *vp, struct ucred *cred,
1225     struct thread *p, struct nfsexstuff *exp)
1226 {
1227         struct vnode *xp;
1228         int error = 0;
1229
1230         xp = ndp->ni_vp;
1231         if (xp != NULL) {
1232                 error = EEXIST;
1233         } else {
1234                 xp = ndp->ni_dvp;
1235                 if (vp->v_mount != xp->v_mount)
1236                         error = EXDEV;
1237         }
1238         if (!error) {
1239                 NFSVOPLOCK(vp, LK_EXCLUSIVE | LK_RETRY);
1240                 if ((vp->v_iflag & VI_DOOMED) == 0)
1241                         error = VOP_LINK(ndp->ni_dvp, vp, &ndp->ni_cnd);
1242                 else
1243                         error = EPERM;
1244                 if (ndp->ni_dvp == vp)
1245                         vrele(ndp->ni_dvp);
1246                 else
1247                         vput(ndp->ni_dvp);
1248                 NFSVOPUNLOCK(vp, 0);
1249         } else {
1250                 if (ndp->ni_dvp == ndp->ni_vp)
1251                         vrele(ndp->ni_dvp);
1252                 else
1253                         vput(ndp->ni_dvp);
1254                 if (ndp->ni_vp)
1255                         vrele(ndp->ni_vp);
1256         }
1257         nfsvno_relpathbuf(ndp);
1258         NFSEXITCODE(error);
1259         return (error);
1260 }
1261
1262 /*
1263  * Do the fsync() appropriate for the commit.
1264  */
1265 int
1266 nfsvno_fsync(struct vnode *vp, u_int64_t off, int cnt, struct ucred *cred,
1267     struct thread *td)
1268 {
1269         int error = 0;
1270
1271         /*
1272          * RFC 1813 3.3.21: if count is 0, a flush from offset to the end of
1273          * file is done.  At this time VOP_FSYNC does not accept offset and
1274          * byte count parameters so call VOP_FSYNC the whole file for now.
1275          * The same is true for NFSv4: RFC 3530 Sec. 14.2.3.
1276          * File systems that do not use the buffer cache (as indicated
1277          * by MNTK_USES_BCACHE not being set) must use VOP_FSYNC().
1278          */
1279         if (cnt == 0 || cnt > MAX_COMMIT_COUNT ||
1280             (vp->v_mount->mnt_kern_flag & MNTK_USES_BCACHE) == 0) {
1281                 /*
1282                  * Give up and do the whole thing
1283                  */
1284                 if (vp->v_object &&
1285                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1286                         VM_OBJECT_WLOCK(vp->v_object);
1287                         vm_object_page_clean(vp->v_object, 0, 0, OBJPC_SYNC);
1288                         VM_OBJECT_WUNLOCK(vp->v_object);
1289                 }
1290                 error = VOP_FSYNC(vp, MNT_WAIT, td);
1291         } else {
1292                 /*
1293                  * Locate and synchronously write any buffers that fall
1294                  * into the requested range.  Note:  we are assuming that
1295                  * f_iosize is a power of 2.
1296                  */
1297                 int iosize = vp->v_mount->mnt_stat.f_iosize;
1298                 int iomask = iosize - 1;
1299                 struct bufobj *bo;
1300                 daddr_t lblkno;
1301
1302                 /*
1303                  * Align to iosize boundry, super-align to page boundry.
1304                  */
1305                 if (off & iomask) {
1306                         cnt += off & iomask;
1307                         off &= ~(u_quad_t)iomask;
1308                 }
1309                 if (off & PAGE_MASK) {
1310                         cnt += off & PAGE_MASK;
1311                         off &= ~(u_quad_t)PAGE_MASK;
1312                 }
1313                 lblkno = off / iosize;
1314
1315                 if (vp->v_object &&
1316                    (vp->v_object->flags & OBJ_MIGHTBEDIRTY)) {
1317                         VM_OBJECT_WLOCK(vp->v_object);
1318                         vm_object_page_clean(vp->v_object, off, off + cnt,
1319                             OBJPC_SYNC);
1320                         VM_OBJECT_WUNLOCK(vp->v_object);
1321                 }
1322
1323                 bo = &vp->v_bufobj;
1324                 BO_LOCK(bo);
1325                 while (cnt > 0) {
1326                         struct buf *bp;
1327
1328                         /*
1329                          * If we have a buffer and it is marked B_DELWRI we
1330                          * have to lock and write it.  Otherwise the prior
1331                          * write is assumed to have already been committed.
1332                          *
1333                          * gbincore() can return invalid buffers now so we
1334                          * have to check that bit as well (though B_DELWRI
1335                          * should not be set if B_INVAL is set there could be
1336                          * a race here since we haven't locked the buffer).
1337                          */
1338                         if ((bp = gbincore(&vp->v_bufobj, lblkno)) != NULL) {
1339                                 if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_SLEEPFAIL |
1340                                     LK_INTERLOCK, BO_LOCKPTR(bo)) == ENOLCK) {
1341                                         BO_LOCK(bo);
1342                                         continue; /* retry */
1343                                 }
1344                                 if ((bp->b_flags & (B_DELWRI|B_INVAL)) ==
1345                                     B_DELWRI) {
1346                                         bremfree(bp);
1347                                         bp->b_flags &= ~B_ASYNC;
1348                                         bwrite(bp);
1349                                         ++nfs_commit_miss;
1350                                 } else
1351                                         BUF_UNLOCK(bp);
1352                                 BO_LOCK(bo);
1353                         }
1354                         ++nfs_commit_blks;
1355                         if (cnt < iosize)
1356                                 break;
1357                         cnt -= iosize;
1358                         ++lblkno;
1359                 }
1360                 BO_UNLOCK(bo);
1361         }
1362         NFSEXITCODE(error);
1363         return (error);
1364 }
1365
1366 /*
1367  * Statfs vnode op.
1368  */
1369 int
1370 nfsvno_statfs(struct vnode *vp, struct statfs *sf)
1371 {
1372         int error;
1373
1374         error = VFS_STATFS(vp->v_mount, sf);
1375         if (error == 0) {
1376                 /*
1377                  * Since NFS handles these values as unsigned on the
1378                  * wire, there is no way to represent negative values,
1379                  * so set them to 0. Without this, they will appear
1380                  * to be very large positive values for clients like
1381                  * Solaris10.
1382                  */
1383                 if (sf->f_bavail < 0)
1384                         sf->f_bavail = 0;
1385                 if (sf->f_ffree < 0)
1386                         sf->f_ffree = 0;
1387         }
1388         NFSEXITCODE(error);
1389         return (error);
1390 }
1391
1392 /*
1393  * Do the vnode op stuff for Open. Similar to nfsvno_createsub(), but
1394  * must handle nfsrv_opencheck() calls after any other access checks.
1395  */
1396 void
1397 nfsvno_open(struct nfsrv_descript *nd, struct nameidata *ndp,
1398     nfsquad_t clientid, nfsv4stateid_t *stateidp, struct nfsstate *stp,
1399     int *exclusive_flagp, struct nfsvattr *nvap, int32_t *cverf, int create,
1400     NFSACL_T *aclp, nfsattrbit_t *attrbitp, struct ucred *cred, struct thread *p,
1401     struct nfsexstuff *exp, struct vnode **vpp)
1402 {
1403         struct vnode *vp = NULL;
1404         u_quad_t tempsize;
1405         struct nfsexstuff nes;
1406
1407         if (ndp->ni_vp == NULL)
1408                 nd->nd_repstat = nfsrv_opencheck(clientid,
1409                     stateidp, stp, NULL, nd, p, nd->nd_repstat);
1410         if (!nd->nd_repstat) {
1411                 if (ndp->ni_vp == NULL) {
1412                         vrele(ndp->ni_startdir);
1413                         nd->nd_repstat = VOP_CREATE(ndp->ni_dvp,
1414                             &ndp->ni_vp, &ndp->ni_cnd, &nvap->na_vattr);
1415                         vput(ndp->ni_dvp);
1416                         nfsvno_relpathbuf(ndp);
1417                         if (!nd->nd_repstat) {
1418                                 if (*exclusive_flagp) {
1419                                         *exclusive_flagp = 0;
1420                                         NFSVNO_ATTRINIT(nvap);
1421                                         nvap->na_atime.tv_sec = cverf[0];
1422                                         nvap->na_atime.tv_nsec = cverf[1];
1423                                         nd->nd_repstat = VOP_SETATTR(ndp->ni_vp,
1424                                             &nvap->na_vattr, cred);
1425                                 } else {
1426                                         nfsrv_fixattr(nd, ndp->ni_vp, nvap,
1427                                             aclp, p, attrbitp, exp);
1428                                 }
1429                         }
1430                         vp = ndp->ni_vp;
1431                 } else {
1432                         if (ndp->ni_startdir)
1433                                 vrele(ndp->ni_startdir);
1434                         nfsvno_relpathbuf(ndp);
1435                         vp = ndp->ni_vp;
1436                         if (create == NFSV4OPEN_CREATE) {
1437                                 if (ndp->ni_dvp == vp)
1438                                         vrele(ndp->ni_dvp);
1439                                 else
1440                                         vput(ndp->ni_dvp);
1441                         }
1442                         if (NFSVNO_ISSETSIZE(nvap) && vp->v_type == VREG) {
1443                                 if (ndp->ni_cnd.cn_flags & RDONLY)
1444                                         NFSVNO_SETEXRDONLY(&nes);
1445                                 else
1446                                         NFSVNO_EXINIT(&nes);
1447                                 nd->nd_repstat = nfsvno_accchk(vp,
1448                                     VWRITE, cred, &nes, p,
1449                                     NFSACCCHK_NOOVERRIDE,
1450                                     NFSACCCHK_VPISLOCKED, NULL);
1451                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1452                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1453                                 if (!nd->nd_repstat) {
1454                                         tempsize = nvap->na_size;
1455                                         NFSVNO_ATTRINIT(nvap);
1456                                         nvap->na_size = tempsize;
1457                                         nd->nd_repstat = VOP_SETATTR(vp,
1458                                             &nvap->na_vattr, cred);
1459                                 }
1460                         } else if (vp->v_type == VREG) {
1461                                 nd->nd_repstat = nfsrv_opencheck(clientid,
1462                                     stateidp, stp, vp, nd, p, nd->nd_repstat);
1463                         }
1464                 }
1465         } else {
1466                 if (ndp->ni_cnd.cn_flags & HASBUF)
1467                         nfsvno_relpathbuf(ndp);
1468                 if (ndp->ni_startdir && create == NFSV4OPEN_CREATE) {
1469                         vrele(ndp->ni_startdir);
1470                         if (ndp->ni_dvp == ndp->ni_vp)
1471                                 vrele(ndp->ni_dvp);
1472                         else
1473                                 vput(ndp->ni_dvp);
1474                         if (ndp->ni_vp)
1475                                 vput(ndp->ni_vp);
1476                 }
1477         }
1478         *vpp = vp;
1479
1480         NFSEXITCODE2(0, nd);
1481 }
1482
1483 /*
1484  * Updates the file rev and sets the mtime and ctime
1485  * to the current clock time, returning the va_filerev and va_Xtime
1486  * values.
1487  * Return ESTALE to indicate the vnode is VI_DOOMED.
1488  */
1489 int
1490 nfsvno_updfilerev(struct vnode *vp, struct nfsvattr *nvap,
1491     struct ucred *cred, struct thread *p)
1492 {
1493         struct vattr va;
1494
1495         VATTR_NULL(&va);
1496         vfs_timestamp(&va.va_mtime);
1497         if (NFSVOPISLOCKED(vp) != LK_EXCLUSIVE) {
1498                 NFSVOPLOCK(vp, LK_UPGRADE | LK_RETRY);
1499                 if ((vp->v_iflag & VI_DOOMED) != 0)
1500                         return (ESTALE);
1501         }
1502         (void) VOP_SETATTR(vp, &va, cred);
1503         (void) nfsvno_getattr(vp, nvap, cred, p, 1);
1504         return (0);
1505 }
1506
1507 /*
1508  * Glue routine to nfsv4_fillattr().
1509  */
1510 int
1511 nfsvno_fillattr(struct nfsrv_descript *nd, struct mount *mp, struct vnode *vp,
1512     struct nfsvattr *nvap, fhandle_t *fhp, int rderror, nfsattrbit_t *attrbitp,
1513     struct ucred *cred, struct thread *p, int isdgram, int reterr,
1514     int supports_nfsv4acls, int at_root, uint64_t mounted_on_fileno)
1515 {
1516         int error;
1517
1518         error = nfsv4_fillattr(nd, mp, vp, NULL, &nvap->na_vattr, fhp, rderror,
1519             attrbitp, cred, p, isdgram, reterr, supports_nfsv4acls, at_root,
1520             mounted_on_fileno);
1521         NFSEXITCODE2(0, nd);
1522         return (error);
1523 }
1524
1525 /* Since the Readdir vnode ops vary, put the entire functions in here. */
1526 /*
1527  * nfs readdir service
1528  * - mallocs what it thinks is enough to read
1529  *      count rounded up to a multiple of DIRBLKSIZ <= NFS_MAXREADDIR
1530  * - calls VOP_READDIR()
1531  * - loops around building the reply
1532  *      if the output generated exceeds count break out of loop
1533  *      The NFSM_CLGET macro is used here so that the reply will be packed
1534  *      tightly in mbuf clusters.
1535  * - it trims out records with d_fileno == 0
1536  *      this doesn't matter for Unix clients, but they might confuse clients
1537  *      for other os'.
1538  * - it trims out records with d_type == DT_WHT
1539  *      these cannot be seen through NFS (unless we extend the protocol)
1540  *     The alternate call nfsrvd_readdirplus() does lookups as well.
1541  * PS: The NFS protocol spec. does not clarify what the "count" byte
1542  *      argument is a count of.. just name strings and file id's or the
1543  *      entire reply rpc or ...
1544  *      I tried just file name and id sizes and it confused the Sun client,
1545  *      so I am using the full rpc size now. The "paranoia.." comment refers
1546  *      to including the status longwords that are not a part of the dir.
1547  *      "entry" structures, but are in the rpc.
1548  */
1549 int
1550 nfsrvd_readdir(struct nfsrv_descript *nd, int isdgram,
1551     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1552 {
1553         struct dirent *dp;
1554         u_int32_t *tl;
1555         int dirlen;
1556         char *cpos, *cend, *rbuf;
1557         struct nfsvattr at;
1558         int nlen, error = 0, getret = 1;
1559         int siz, cnt, fullsiz, eofflag, ncookies;
1560         u_int64_t off, toff, verf;
1561         u_long *cookies = NULL, *cookiep;
1562         struct uio io;
1563         struct iovec iv;
1564         int is_ufs;
1565
1566         if (nd->nd_repstat) {
1567                 nfsrv_postopattr(nd, getret, &at);
1568                 goto out;
1569         }
1570         if (nd->nd_flag & ND_NFSV2) {
1571                 NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1572                 off = fxdr_unsigned(u_quad_t, *tl++);
1573         } else {
1574                 NFSM_DISSECT(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1575                 off = fxdr_hyper(tl);
1576                 tl += 2;
1577                 verf = fxdr_hyper(tl);
1578                 tl += 2;
1579         }
1580         toff = off;
1581         cnt = fxdr_unsigned(int, *tl);
1582         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1583                 cnt = NFS_SRVMAXDATA(nd);
1584         siz = ((cnt + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1585         fullsiz = siz;
1586         if (nd->nd_flag & ND_NFSV3) {
1587                 nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred,
1588                     p, 1);
1589 #if 0
1590                 /*
1591                  * va_filerev is not sufficient as a cookie verifier,
1592                  * since it is not supposed to change when entries are
1593                  * removed/added unless that offset cookies returned to
1594                  * the client are no longer valid.
1595                  */
1596                 if (!nd->nd_repstat && toff && verf != at.na_filerev)
1597                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1598 #endif
1599         }
1600         if (!nd->nd_repstat && vp->v_type != VDIR)
1601                 nd->nd_repstat = NFSERR_NOTDIR;
1602         if (nd->nd_repstat == 0 && cnt == 0) {
1603                 if (nd->nd_flag & ND_NFSV2)
1604                         /* NFSv2 does not have NFSERR_TOOSMALL */
1605                         nd->nd_repstat = EPERM;
1606                 else
1607                         nd->nd_repstat = NFSERR_TOOSMALL;
1608         }
1609         if (!nd->nd_repstat)
1610                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1611                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1612                     NFSACCCHK_VPISLOCKED, NULL);
1613         if (nd->nd_repstat) {
1614                 vput(vp);
1615                 if (nd->nd_flag & ND_NFSV3)
1616                         nfsrv_postopattr(nd, getret, &at);
1617                 goto out;
1618         }
1619         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1620         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1621 again:
1622         eofflag = 0;
1623         if (cookies) {
1624                 free((caddr_t)cookies, M_TEMP);
1625                 cookies = NULL;
1626         }
1627
1628         iv.iov_base = rbuf;
1629         iv.iov_len = siz;
1630         io.uio_iov = &iv;
1631         io.uio_iovcnt = 1;
1632         io.uio_offset = (off_t)off;
1633         io.uio_resid = siz;
1634         io.uio_segflg = UIO_SYSSPACE;
1635         io.uio_rw = UIO_READ;
1636         io.uio_td = NULL;
1637         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1638             &cookies);
1639         off = (u_int64_t)io.uio_offset;
1640         if (io.uio_resid)
1641                 siz -= io.uio_resid;
1642
1643         if (!cookies && !nd->nd_repstat)
1644                 nd->nd_repstat = NFSERR_PERM;
1645         if (nd->nd_flag & ND_NFSV3) {
1646                 getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1647                 if (!nd->nd_repstat)
1648                         nd->nd_repstat = getret;
1649         }
1650
1651         /*
1652          * Handles the failed cases. nd->nd_repstat == 0 past here.
1653          */
1654         if (nd->nd_repstat) {
1655                 vput(vp);
1656                 free((caddr_t)rbuf, M_TEMP);
1657                 if (cookies)
1658                         free((caddr_t)cookies, M_TEMP);
1659                 if (nd->nd_flag & ND_NFSV3)
1660                         nfsrv_postopattr(nd, getret, &at);
1661                 goto out;
1662         }
1663         /*
1664          * If nothing read, return eof
1665          * rpc reply
1666          */
1667         if (siz == 0) {
1668                 vput(vp);
1669                 if (nd->nd_flag & ND_NFSV2) {
1670                         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1671                 } else {
1672                         nfsrv_postopattr(nd, getret, &at);
1673                         NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1674                         txdr_hyper(at.na_filerev, tl);
1675                         tl += 2;
1676                 }
1677                 *tl++ = newnfs_false;
1678                 *tl = newnfs_true;
1679                 FREE((caddr_t)rbuf, M_TEMP);
1680                 FREE((caddr_t)cookies, M_TEMP);
1681                 goto out;
1682         }
1683
1684         /*
1685          * Check for degenerate cases of nothing useful read.
1686          * If so go try again
1687          */
1688         cpos = rbuf;
1689         cend = rbuf + siz;
1690         dp = (struct dirent *)cpos;
1691         cookiep = cookies;
1692
1693         /*
1694          * For some reason FreeBSD's ufs_readdir() chooses to back the
1695          * directory offset up to a block boundary, so it is necessary to
1696          * skip over the records that precede the requested offset. This
1697          * requires the assumption that file offset cookies monotonically
1698          * increase.
1699          */
1700         while (cpos < cend && ncookies > 0 &&
1701             (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1702              (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff))) {
1703                 cpos += dp->d_reclen;
1704                 dp = (struct dirent *)cpos;
1705                 cookiep++;
1706                 ncookies--;
1707         }
1708         if (cpos >= cend || ncookies == 0) {
1709                 siz = fullsiz;
1710                 toff = off;
1711                 goto again;
1712         }
1713         vput(vp);
1714
1715         /*
1716          * dirlen is the size of the reply, including all XDR and must
1717          * not exceed cnt. For NFSv2, RFC1094 didn't clearly indicate
1718          * if the XDR should be included in "count", but to be safe, we do.
1719          * (Include the two booleans at the end of the reply in dirlen now.)
1720          */
1721         if (nd->nd_flag & ND_NFSV3) {
1722                 nfsrv_postopattr(nd, getret, &at);
1723                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1724                 txdr_hyper(at.na_filerev, tl);
1725                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
1726         } else {
1727                 dirlen = 2 * NFSX_UNSIGNED;
1728         }
1729
1730         /* Loop through the records and build reply */
1731         while (cpos < cend && ncookies > 0) {
1732                 nlen = dp->d_namlen;
1733                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
1734                         nlen <= NFS_MAXNAMLEN) {
1735                         if (nd->nd_flag & ND_NFSV3)
1736                                 dirlen += (6*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1737                         else
1738                                 dirlen += (4*NFSX_UNSIGNED + NFSM_RNDUP(nlen));
1739                         if (dirlen > cnt) {
1740                                 eofflag = 0;
1741                                 break;
1742                         }
1743
1744                         /*
1745                          * Build the directory record xdr from
1746                          * the dirent entry.
1747                          */
1748                         if (nd->nd_flag & ND_NFSV3) {
1749                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1750                                 *tl++ = newnfs_true;
1751                                 *tl++ = 0;
1752                         } else {
1753                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1754                                 *tl++ = newnfs_true;
1755                         }
1756                         *tl = txdr_unsigned(dp->d_fileno);
1757                         (void) nfsm_strtom(nd, dp->d_name, nlen);
1758                         if (nd->nd_flag & ND_NFSV3) {
1759                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1760                                 *tl++ = 0;
1761                         } else
1762                                 NFSM_BUILD(tl, u_int32_t *, NFSX_UNSIGNED);
1763                         *tl = txdr_unsigned(*cookiep);
1764                 }
1765                 cpos += dp->d_reclen;
1766                 dp = (struct dirent *)cpos;
1767                 cookiep++;
1768                 ncookies--;
1769         }
1770         if (cpos < cend)
1771                 eofflag = 0;
1772         NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1773         *tl++ = newnfs_false;
1774         if (eofflag)
1775                 *tl = newnfs_true;
1776         else
1777                 *tl = newnfs_false;
1778         FREE((caddr_t)rbuf, M_TEMP);
1779         FREE((caddr_t)cookies, M_TEMP);
1780
1781 out:
1782         NFSEXITCODE2(0, nd);
1783         return (0);
1784 nfsmout:
1785         vput(vp);
1786         NFSEXITCODE2(error, nd);
1787         return (error);
1788 }
1789
1790 /*
1791  * Readdirplus for V3 and Readdir for V4.
1792  */
1793 int
1794 nfsrvd_readdirplus(struct nfsrv_descript *nd, int isdgram,
1795     struct vnode *vp, struct thread *p, struct nfsexstuff *exp)
1796 {
1797         struct dirent *dp;
1798         u_int32_t *tl;
1799         int dirlen;
1800         char *cpos, *cend, *rbuf;
1801         struct vnode *nvp;
1802         fhandle_t nfh;
1803         struct nfsvattr nva, at, *nvap = &nva;
1804         struct mbuf *mb0, *mb1;
1805         struct nfsreferral *refp;
1806         int nlen, r, error = 0, getret = 1, usevget = 1;
1807         int siz, cnt, fullsiz, eofflag, ncookies, entrycnt;
1808         caddr_t bpos0, bpos1;
1809         u_int64_t off, toff, verf;
1810         u_long *cookies = NULL, *cookiep;
1811         nfsattrbit_t attrbits, rderrbits, savbits;
1812         struct uio io;
1813         struct iovec iv;
1814         struct componentname cn;
1815         int at_root, is_ufs, is_zfs, needs_unbusy, supports_nfsv4acls;
1816         struct mount *mp, *new_mp;
1817         uint64_t mounted_on_fileno;
1818
1819         if (nd->nd_repstat) {
1820                 nfsrv_postopattr(nd, getret, &at);
1821                 goto out;
1822         }
1823         NFSM_DISSECT(tl, u_int32_t *, 6 * NFSX_UNSIGNED);
1824         off = fxdr_hyper(tl);
1825         toff = off;
1826         tl += 2;
1827         verf = fxdr_hyper(tl);
1828         tl += 2;
1829         siz = fxdr_unsigned(int, *tl++);
1830         cnt = fxdr_unsigned(int, *tl);
1831
1832         /*
1833          * Use the server's maximum data transfer size as the upper bound
1834          * on reply datalen.
1835          */
1836         if (cnt > NFS_SRVMAXDATA(nd) || cnt < 0)
1837                 cnt = NFS_SRVMAXDATA(nd);
1838
1839         /*
1840          * siz is a "hint" of how much directory information (name, fileid,
1841          * cookie) should be in the reply. At least one client "hints" 0,
1842          * so I set it to cnt for that case. I also round it up to the
1843          * next multiple of DIRBLKSIZ.
1844          */
1845         if (siz <= 0)
1846                 siz = cnt;
1847         siz = ((siz + DIRBLKSIZ - 1) & ~(DIRBLKSIZ - 1));
1848
1849         if (nd->nd_flag & ND_NFSV4) {
1850                 error = nfsrv_getattrbits(nd, &attrbits, NULL, NULL);
1851                 if (error)
1852                         goto nfsmout;
1853                 NFSSET_ATTRBIT(&savbits, &attrbits);
1854                 NFSCLRNOTFILLABLE_ATTRBIT(&attrbits);
1855                 NFSZERO_ATTRBIT(&rderrbits);
1856                 NFSSETBIT_ATTRBIT(&rderrbits, NFSATTRBIT_RDATTRERROR);
1857         } else {
1858                 NFSZERO_ATTRBIT(&attrbits);
1859         }
1860         fullsiz = siz;
1861         nd->nd_repstat = getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1862         if (!nd->nd_repstat) {
1863             if (off && verf != at.na_filerev) {
1864                 /*
1865                  * va_filerev is not sufficient as a cookie verifier,
1866                  * since it is not supposed to change when entries are
1867                  * removed/added unless that offset cookies returned to
1868                  * the client are no longer valid.
1869                  */
1870 #if 0
1871                 if (nd->nd_flag & ND_NFSV4) {
1872                         nd->nd_repstat = NFSERR_NOTSAME;
1873                 } else {
1874                         nd->nd_repstat = NFSERR_BAD_COOKIE;
1875                 }
1876 #endif
1877             } else if ((nd->nd_flag & ND_NFSV4) && off == 0 && verf != 0) {
1878                 nd->nd_repstat = NFSERR_BAD_COOKIE;
1879             }
1880         }
1881         if (!nd->nd_repstat && vp->v_type != VDIR)
1882                 nd->nd_repstat = NFSERR_NOTDIR;
1883         if (!nd->nd_repstat && cnt == 0)
1884                 nd->nd_repstat = NFSERR_TOOSMALL;
1885         if (!nd->nd_repstat)
1886                 nd->nd_repstat = nfsvno_accchk(vp, VEXEC,
1887                     nd->nd_cred, exp, p, NFSACCCHK_NOOVERRIDE,
1888                     NFSACCCHK_VPISLOCKED, NULL);
1889         if (nd->nd_repstat) {
1890                 vput(vp);
1891                 if (nd->nd_flag & ND_NFSV3)
1892                         nfsrv_postopattr(nd, getret, &at);
1893                 goto out;
1894         }
1895         is_ufs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "ufs") == 0;
1896         is_zfs = strcmp(vp->v_mount->mnt_vfc->vfc_name, "zfs") == 0;
1897
1898         MALLOC(rbuf, caddr_t, siz, M_TEMP, M_WAITOK);
1899 again:
1900         eofflag = 0;
1901         if (cookies) {
1902                 free((caddr_t)cookies, M_TEMP);
1903                 cookies = NULL;
1904         }
1905
1906         iv.iov_base = rbuf;
1907         iv.iov_len = siz;
1908         io.uio_iov = &iv;
1909         io.uio_iovcnt = 1;
1910         io.uio_offset = (off_t)off;
1911         io.uio_resid = siz;
1912         io.uio_segflg = UIO_SYSSPACE;
1913         io.uio_rw = UIO_READ;
1914         io.uio_td = NULL;
1915         nd->nd_repstat = VOP_READDIR(vp, &io, nd->nd_cred, &eofflag, &ncookies,
1916             &cookies);
1917         off = (u_int64_t)io.uio_offset;
1918         if (io.uio_resid)
1919                 siz -= io.uio_resid;
1920
1921         getret = nfsvno_getattr(vp, &at, nd->nd_cred, p, 1);
1922
1923         if (!cookies && !nd->nd_repstat)
1924                 nd->nd_repstat = NFSERR_PERM;
1925         if (!nd->nd_repstat)
1926                 nd->nd_repstat = getret;
1927         if (nd->nd_repstat) {
1928                 vput(vp);
1929                 if (cookies)
1930                         free((caddr_t)cookies, M_TEMP);
1931                 free((caddr_t)rbuf, M_TEMP);
1932                 if (nd->nd_flag & ND_NFSV3)
1933                         nfsrv_postopattr(nd, getret, &at);
1934                 goto out;
1935         }
1936         /*
1937          * If nothing read, return eof
1938          * rpc reply
1939          */
1940         if (siz == 0) {
1941                 vput(vp);
1942                 if (nd->nd_flag & ND_NFSV3)
1943                         nfsrv_postopattr(nd, getret, &at);
1944                 NFSM_BUILD(tl, u_int32_t *, 4 * NFSX_UNSIGNED);
1945                 txdr_hyper(at.na_filerev, tl);
1946                 tl += 2;
1947                 *tl++ = newnfs_false;
1948                 *tl = newnfs_true;
1949                 free((caddr_t)cookies, M_TEMP);
1950                 free((caddr_t)rbuf, M_TEMP);
1951                 goto out;
1952         }
1953
1954         /*
1955          * Check for degenerate cases of nothing useful read.
1956          * If so go try again
1957          */
1958         cpos = rbuf;
1959         cend = rbuf + siz;
1960         dp = (struct dirent *)cpos;
1961         cookiep = cookies;
1962
1963         /*
1964          * For some reason FreeBSD's ufs_readdir() chooses to back the
1965          * directory offset up to a block boundary, so it is necessary to
1966          * skip over the records that precede the requested offset. This
1967          * requires the assumption that file offset cookies monotonically
1968          * increase.
1969          */
1970         while (cpos < cend && ncookies > 0 &&
1971           (dp->d_fileno == 0 || dp->d_type == DT_WHT ||
1972            (is_ufs == 1 && ((u_quad_t)(*cookiep)) <= toff) ||
1973            ((nd->nd_flag & ND_NFSV4) &&
1974             ((dp->d_namlen == 1 && dp->d_name[0] == '.') ||
1975              (dp->d_namlen==2 && dp->d_name[0]=='.' && dp->d_name[1]=='.'))))) {
1976                 cpos += dp->d_reclen;
1977                 dp = (struct dirent *)cpos;
1978                 cookiep++;
1979                 ncookies--;
1980         }
1981         if (cpos >= cend || ncookies == 0) {
1982                 siz = fullsiz;
1983                 toff = off;
1984                 goto again;
1985         }
1986
1987         /*
1988          * Busy the file system so that the mount point won't go away
1989          * and, as such, VFS_VGET() can be used safely.
1990          */
1991         mp = vp->v_mount;
1992         vfs_ref(mp);
1993         NFSVOPUNLOCK(vp, 0);
1994         nd->nd_repstat = vfs_busy(mp, 0);
1995         vfs_rel(mp);
1996         if (nd->nd_repstat != 0) {
1997                 vrele(vp);
1998                 free(cookies, M_TEMP);
1999                 free(rbuf, M_TEMP);
2000                 if (nd->nd_flag & ND_NFSV3)
2001                         nfsrv_postopattr(nd, getret, &at);
2002                 goto out;
2003         }
2004
2005         /*
2006          * Check to see if entries in this directory can be safely acquired
2007          * via VFS_VGET() or if a switch to VOP_LOOKUP() is required.
2008          * ZFS snapshot directories need VOP_LOOKUP(), so that any
2009          * automount of the snapshot directory that is required will
2010          * be done.
2011          * This needs to be done here for NFSv4, since NFSv4 never does
2012          * a VFS_VGET() for "." or "..".
2013          */
2014         if (is_zfs == 1) {
2015                 r = VFS_VGET(mp, at.na_fileid, LK_SHARED, &nvp);
2016                 if (r == EOPNOTSUPP) {
2017                         usevget = 0;
2018                         cn.cn_nameiop = LOOKUP;
2019                         cn.cn_lkflags = LK_SHARED | LK_RETRY;
2020                         cn.cn_cred = nd->nd_cred;
2021                         cn.cn_thread = p;
2022                 } else if (r == 0)
2023                         vput(nvp);
2024         }
2025
2026         /*
2027          * Save this position, in case there is an error before one entry
2028          * is created.
2029          */
2030         mb0 = nd->nd_mb;
2031         bpos0 = nd->nd_bpos;
2032
2033         /*
2034          * Fill in the first part of the reply.
2035          * dirlen is the reply length in bytes and cannot exceed cnt.
2036          * (Include the two booleans at the end of the reply in dirlen now,
2037          *  so we recognize when we have exceeded cnt.)
2038          */
2039         if (nd->nd_flag & ND_NFSV3) {
2040                 dirlen = NFSX_V3POSTOPATTR + NFSX_VERF + 2 * NFSX_UNSIGNED;
2041                 nfsrv_postopattr(nd, getret, &at);
2042         } else {
2043                 dirlen = NFSX_VERF + 2 * NFSX_UNSIGNED;
2044         }
2045         NFSM_BUILD(tl, u_int32_t *, NFSX_VERF);
2046         txdr_hyper(at.na_filerev, tl);
2047
2048         /*
2049          * Save this position, in case there is an empty reply needed.
2050          */
2051         mb1 = nd->nd_mb;
2052         bpos1 = nd->nd_bpos;
2053
2054         /* Loop through the records and build reply */
2055         entrycnt = 0;
2056         while (cpos < cend && ncookies > 0 && dirlen < cnt) {
2057                 nlen = dp->d_namlen;
2058                 if (dp->d_fileno != 0 && dp->d_type != DT_WHT &&
2059                     nlen <= NFS_MAXNAMLEN &&
2060                     ((nd->nd_flag & ND_NFSV3) || nlen > 2 ||
2061                      (nlen==2 && (dp->d_name[0]!='.' || dp->d_name[1]!='.'))
2062                       || (nlen == 1 && dp->d_name[0] != '.'))) {
2063                         /*
2064                          * Save the current position in the reply, in case
2065                          * this entry exceeds cnt.
2066                          */
2067                         mb1 = nd->nd_mb;
2068                         bpos1 = nd->nd_bpos;
2069
2070                         /*
2071                          * For readdir_and_lookup get the vnode using
2072                          * the file number.
2073                          */
2074                         nvp = NULL;
2075                         refp = NULL;
2076                         r = 0;
2077                         at_root = 0;
2078                         needs_unbusy = 0;
2079                         new_mp = mp;
2080                         mounted_on_fileno = (uint64_t)dp->d_fileno;
2081                         if ((nd->nd_flag & ND_NFSV3) ||
2082                             NFSNONZERO_ATTRBIT(&savbits)) {
2083                                 if (nd->nd_flag & ND_NFSV4)
2084                                         refp = nfsv4root_getreferral(NULL,
2085                                             vp, dp->d_fileno);
2086                                 if (refp == NULL) {
2087                                         if (usevget)
2088                                                 r = VFS_VGET(mp, dp->d_fileno,
2089                                                     LK_SHARED, &nvp);
2090                                         else
2091                                                 r = EOPNOTSUPP;
2092                                         if (r == EOPNOTSUPP) {
2093                                                 if (usevget) {
2094                                                         usevget = 0;
2095                                                         cn.cn_nameiop = LOOKUP;
2096                                                         cn.cn_lkflags =
2097                                                             LK_SHARED |
2098                                                             LK_RETRY;
2099                                                         cn.cn_cred =
2100                                                             nd->nd_cred;
2101                                                         cn.cn_thread = p;
2102                                                 }
2103                                                 cn.cn_nameptr = dp->d_name;
2104                                                 cn.cn_namelen = nlen;
2105                                                 cn.cn_flags = ISLASTCN |
2106                                                     NOFOLLOW | LOCKLEAF;
2107                                                 if (nlen == 2 &&
2108                                                     dp->d_name[0] == '.' &&
2109                                                     dp->d_name[1] == '.')
2110                                                         cn.cn_flags |=
2111                                                             ISDOTDOT;
2112                                                 if (NFSVOPLOCK(vp, LK_SHARED)
2113                                                     != 0) {
2114                                                         nd->nd_repstat = EPERM;
2115                                                         break;
2116                                                 }
2117                                                 if ((vp->v_vflag & VV_ROOT) != 0
2118                                                     && (cn.cn_flags & ISDOTDOT)
2119                                                     != 0) {
2120                                                         vref(vp);
2121                                                         nvp = vp;
2122                                                         r = 0;
2123                                                 } else {
2124                                                         r = VOP_LOOKUP(vp, &nvp,
2125                                                             &cn);
2126                                                         if (vp != nvp)
2127                                                                 NFSVOPUNLOCK(vp,
2128                                                                     0);
2129                                                 }
2130                                         }
2131
2132                                         /*
2133                                          * For NFSv4, check to see if nvp is
2134                                          * a mount point and get the mount
2135                                          * point vnode, as required.
2136                                          */
2137                                         if (r == 0 &&
2138                                             nfsrv_enable_crossmntpt != 0 &&
2139                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2140                                             nvp->v_type == VDIR &&
2141                                             nvp->v_mountedhere != NULL) {
2142                                                 new_mp = nvp->v_mountedhere;
2143                                                 r = vfs_busy(new_mp, 0);
2144                                                 vput(nvp);
2145                                                 nvp = NULL;
2146                                                 if (r == 0) {
2147                                                         r = VFS_ROOT(new_mp,
2148                                                             LK_SHARED, &nvp);
2149                                                         needs_unbusy = 1;
2150                                                         if (r == 0)
2151                                                                 at_root = 1;
2152                                                 }
2153                                         }
2154                                 }
2155                                 if (!r) {
2156                                     if (refp == NULL &&
2157                                         ((nd->nd_flag & ND_NFSV3) ||
2158                                          NFSNONZERO_ATTRBIT(&attrbits))) {
2159                                         r = nfsvno_getfh(nvp, &nfh, p);
2160                                         if (!r)
2161                                             r = nfsvno_getattr(nvp, nvap,
2162                                                 nd->nd_cred, p, 1);
2163                                         if (r == 0 && is_zfs == 1 &&
2164                                             nfsrv_enable_crossmntpt != 0 &&
2165                                             (nd->nd_flag & ND_NFSV4) != 0 &&
2166                                             nvp->v_type == VDIR &&
2167                                             vp->v_mount != nvp->v_mount) {
2168                                             /*
2169                                              * For a ZFS snapshot, there is a
2170                                              * pseudo mount that does not set
2171                                              * v_mountedhere, so it needs to
2172                                              * be detected via a different
2173                                              * mount structure.
2174                                              */
2175                                             at_root = 1;
2176                                             if (new_mp == mp)
2177                                                 new_mp = nvp->v_mount;
2178                                         }
2179                                     }
2180                                 } else {
2181                                     nvp = NULL;
2182                                 }
2183                                 if (r) {
2184                                         if (!NFSISSET_ATTRBIT(&attrbits,
2185                                             NFSATTRBIT_RDATTRERROR)) {
2186                                                 if (nvp != NULL)
2187                                                         vput(nvp);
2188                                                 if (needs_unbusy != 0)
2189                                                         vfs_unbusy(new_mp);
2190                                                 nd->nd_repstat = r;
2191                                                 break;
2192                                         }
2193                                 }
2194                         }
2195
2196                         /*
2197                          * Build the directory record xdr
2198                          */
2199                         if (nd->nd_flag & ND_NFSV3) {
2200                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2201                                 *tl++ = newnfs_true;
2202                                 *tl++ = 0;
2203                                 *tl = txdr_unsigned(dp->d_fileno);
2204                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2205                                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2206                                 *tl++ = 0;
2207                                 *tl = txdr_unsigned(*cookiep);
2208                                 nfsrv_postopattr(nd, 0, nvap);
2209                                 dirlen += nfsm_fhtom(nd,(u_int8_t *)&nfh,0,1);
2210                                 dirlen += (5*NFSX_UNSIGNED+NFSX_V3POSTOPATTR);
2211                                 if (nvp != NULL)
2212                                         vput(nvp);
2213                         } else {
2214                                 NFSM_BUILD(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
2215                                 *tl++ = newnfs_true;
2216                                 *tl++ = 0;
2217                                 *tl = txdr_unsigned(*cookiep);
2218                                 dirlen += nfsm_strtom(nd, dp->d_name, nlen);
2219                                 if (nvp != NULL) {
2220                                         supports_nfsv4acls =
2221                                             nfs_supportsnfsv4acls(nvp);
2222                                         NFSVOPUNLOCK(nvp, 0);
2223                                 } else
2224                                         supports_nfsv4acls = 0;
2225                                 if (refp != NULL) {
2226                                         dirlen += nfsrv_putreferralattr(nd,
2227                                             &savbits, refp, 0,
2228                                             &nd->nd_repstat);
2229                                         if (nd->nd_repstat) {
2230                                                 if (nvp != NULL)
2231                                                         vrele(nvp);
2232                                                 if (needs_unbusy != 0)
2233                                                         vfs_unbusy(new_mp);
2234                                                 break;
2235                                         }
2236                                 } else if (r) {
2237                                         dirlen += nfsvno_fillattr(nd, new_mp,
2238                                             nvp, nvap, &nfh, r, &rderrbits,
2239                                             nd->nd_cred, p, isdgram, 0,
2240                                             supports_nfsv4acls, at_root,
2241                                             mounted_on_fileno);
2242                                 } else {
2243                                         dirlen += nfsvno_fillattr(nd, new_mp,
2244                                             nvp, nvap, &nfh, r, &attrbits,
2245                                             nd->nd_cred, p, isdgram, 0,
2246                                             supports_nfsv4acls, at_root,
2247                                             mounted_on_fileno);
2248                                 }
2249                                 if (nvp != NULL)
2250                                         vrele(nvp);
2251                                 dirlen += (3 * NFSX_UNSIGNED);
2252                         }
2253                         if (needs_unbusy != 0)
2254                                 vfs_unbusy(new_mp);
2255                         if (dirlen <= cnt)
2256                                 entrycnt++;
2257                 }
2258                 cpos += dp->d_reclen;
2259                 dp = (struct dirent *)cpos;
2260                 cookiep++;
2261                 ncookies--;
2262         }
2263         vrele(vp);
2264         vfs_unbusy(mp);
2265
2266         /*
2267          * If dirlen > cnt, we must strip off the last entry. If that
2268          * results in an empty reply, report NFSERR_TOOSMALL.
2269          */
2270         if (dirlen > cnt || nd->nd_repstat) {
2271                 if (!nd->nd_repstat && entrycnt == 0)
2272                         nd->nd_repstat = NFSERR_TOOSMALL;
2273                 if (nd->nd_repstat) {
2274                         newnfs_trimtrailing(nd, mb0, bpos0);
2275                         if (nd->nd_flag & ND_NFSV3)
2276                                 nfsrv_postopattr(nd, getret, &at);
2277                 } else
2278                         newnfs_trimtrailing(nd, mb1, bpos1);
2279                 eofflag = 0;
2280         } else if (cpos < cend)
2281                 eofflag = 0;
2282         if (!nd->nd_repstat) {
2283                 NFSM_BUILD(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2284                 *tl++ = newnfs_false;
2285                 if (eofflag)
2286                         *tl = newnfs_true;
2287                 else
2288                         *tl = newnfs_false;
2289         }
2290         FREE((caddr_t)cookies, M_TEMP);
2291         FREE((caddr_t)rbuf, M_TEMP);
2292
2293 out:
2294         NFSEXITCODE2(0, nd);
2295         return (0);
2296 nfsmout:
2297         vput(vp);
2298         NFSEXITCODE2(error, nd);
2299         return (error);
2300 }
2301
2302 /*
2303  * Get the settable attributes out of the mbuf list.
2304  * (Return 0 or EBADRPC)
2305  */
2306 int
2307 nfsrv_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2308     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2309 {
2310         u_int32_t *tl;
2311         struct nfsv2_sattr *sp;
2312         int error = 0, toclient = 0;
2313
2314         switch (nd->nd_flag & (ND_NFSV2 | ND_NFSV3 | ND_NFSV4)) {
2315         case ND_NFSV2:
2316                 NFSM_DISSECT(sp, struct nfsv2_sattr *, NFSX_V2SATTR);
2317                 /*
2318                  * Some old clients didn't fill in the high order 16bits.
2319                  * --> check the low order 2 bytes for 0xffff
2320                  */
2321                 if ((fxdr_unsigned(int, sp->sa_mode) & 0xffff) != 0xffff)
2322                         nvap->na_mode = nfstov_mode(sp->sa_mode);
2323                 if (sp->sa_uid != newnfs_xdrneg1)
2324                         nvap->na_uid = fxdr_unsigned(uid_t, sp->sa_uid);
2325                 if (sp->sa_gid != newnfs_xdrneg1)
2326                         nvap->na_gid = fxdr_unsigned(gid_t, sp->sa_gid);
2327                 if (sp->sa_size != newnfs_xdrneg1)
2328                         nvap->na_size = fxdr_unsigned(u_quad_t, sp->sa_size);
2329                 if (sp->sa_atime.nfsv2_sec != newnfs_xdrneg1) {
2330 #ifdef notyet
2331                         fxdr_nfsv2time(&sp->sa_atime, &nvap->na_atime);
2332 #else
2333                         nvap->na_atime.tv_sec =
2334                                 fxdr_unsigned(u_int32_t,sp->sa_atime.nfsv2_sec);
2335                         nvap->na_atime.tv_nsec = 0;
2336 #endif
2337                 }
2338                 if (sp->sa_mtime.nfsv2_sec != newnfs_xdrneg1)
2339                         fxdr_nfsv2time(&sp->sa_mtime, &nvap->na_mtime);
2340                 break;
2341         case ND_NFSV3:
2342                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2343                 if (*tl == newnfs_true) {
2344                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2345                         nvap->na_mode = nfstov_mode(*tl);
2346                 }
2347                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2348                 if (*tl == newnfs_true) {
2349                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2350                         nvap->na_uid = fxdr_unsigned(uid_t, *tl);
2351                 }
2352                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2353                 if (*tl == newnfs_true) {
2354                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2355                         nvap->na_gid = fxdr_unsigned(gid_t, *tl);
2356                 }
2357                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2358                 if (*tl == newnfs_true) {
2359                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2360                         nvap->na_size = fxdr_hyper(tl);
2361                 }
2362                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2363                 switch (fxdr_unsigned(int, *tl)) {
2364                 case NFSV3SATTRTIME_TOCLIENT:
2365                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2366                         fxdr_nfsv3time(tl, &nvap->na_atime);
2367                         toclient = 1;
2368                         break;
2369                 case NFSV3SATTRTIME_TOSERVER:
2370                         vfs_timestamp(&nvap->na_atime);
2371                         nvap->na_vaflags |= VA_UTIMES_NULL;
2372                         break;
2373                 };
2374                 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2375                 switch (fxdr_unsigned(int, *tl)) {
2376                 case NFSV3SATTRTIME_TOCLIENT:
2377                         NFSM_DISSECT(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
2378                         fxdr_nfsv3time(tl, &nvap->na_mtime);
2379                         nvap->na_vaflags &= ~VA_UTIMES_NULL;
2380                         break;
2381                 case NFSV3SATTRTIME_TOSERVER:
2382                         vfs_timestamp(&nvap->na_mtime);
2383                         if (!toclient)
2384                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2385                         break;
2386                 };
2387                 break;
2388         case ND_NFSV4:
2389                 error = nfsv4_sattr(nd, nvap, attrbitp, aclp, p);
2390         };
2391 nfsmout:
2392         NFSEXITCODE2(error, nd);
2393         return (error);
2394 }
2395
2396 /*
2397  * Handle the setable attributes for V4.
2398  * Returns NFSERR_BADXDR if it can't be parsed, 0 otherwise.
2399  */
2400 int
2401 nfsv4_sattr(struct nfsrv_descript *nd, struct nfsvattr *nvap,
2402     nfsattrbit_t *attrbitp, NFSACL_T *aclp, struct thread *p)
2403 {
2404         u_int32_t *tl;
2405         int attrsum = 0;
2406         int i, j;
2407         int error, attrsize, bitpos, aclsize, aceerr, retnotsup = 0;
2408         int toclient = 0;
2409         u_char *cp, namestr[NFSV4_SMALLSTR + 1];
2410         uid_t uid;
2411         gid_t gid;
2412
2413         error = nfsrv_getattrbits(nd, attrbitp, NULL, &retnotsup);
2414         if (error)
2415                 goto nfsmout;
2416         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2417         attrsize = fxdr_unsigned(int, *tl);
2418
2419         /*
2420          * Loop around getting the setable attributes. If an unsupported
2421          * one is found, set nd_repstat == NFSERR_ATTRNOTSUPP and return.
2422          */
2423         if (retnotsup) {
2424                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2425                 bitpos = NFSATTRBIT_MAX;
2426         } else {
2427                 bitpos = 0;
2428         }
2429         for (; bitpos < NFSATTRBIT_MAX; bitpos++) {
2430             if (attrsum > attrsize) {
2431                 error = NFSERR_BADXDR;
2432                 goto nfsmout;
2433             }
2434             if (NFSISSET_ATTRBIT(attrbitp, bitpos))
2435                 switch (bitpos) {
2436                 case NFSATTRBIT_SIZE:
2437                         NFSM_DISSECT(tl, u_int32_t *, NFSX_HYPER);
2438                         nvap->na_size = fxdr_hyper(tl);
2439                         attrsum += NFSX_HYPER;
2440                         break;
2441                 case NFSATTRBIT_ACL:
2442                         error = nfsrv_dissectacl(nd, aclp, &aceerr, &aclsize,
2443                             p);
2444                         if (error)
2445                                 goto nfsmout;
2446                         if (aceerr && !nd->nd_repstat)
2447                                 nd->nd_repstat = aceerr;
2448                         attrsum += aclsize;
2449                         break;
2450                 case NFSATTRBIT_ARCHIVE:
2451                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2452                         if (!nd->nd_repstat)
2453                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2454                         attrsum += NFSX_UNSIGNED;
2455                         break;
2456                 case NFSATTRBIT_HIDDEN:
2457                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2458                         if (!nd->nd_repstat)
2459                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2460                         attrsum += NFSX_UNSIGNED;
2461                         break;
2462                 case NFSATTRBIT_MIMETYPE:
2463                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2464                         i = fxdr_unsigned(int, *tl);
2465                         error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
2466                         if (error)
2467                                 goto nfsmout;
2468                         if (!nd->nd_repstat)
2469                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2470                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(i));
2471                         break;
2472                 case NFSATTRBIT_MODE:
2473                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2474                         nvap->na_mode = nfstov_mode(*tl);
2475                         attrsum += NFSX_UNSIGNED;
2476                         break;
2477                 case NFSATTRBIT_OWNER:
2478                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2479                         j = fxdr_unsigned(int, *tl);
2480                         if (j < 0) {
2481                                 error = NFSERR_BADXDR;
2482                                 goto nfsmout;
2483                         }
2484                         if (j > NFSV4_SMALLSTR)
2485                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2486                         else
2487                                 cp = namestr;
2488                         error = nfsrv_mtostr(nd, cp, j);
2489                         if (error) {
2490                                 if (j > NFSV4_SMALLSTR)
2491                                         free(cp, M_NFSSTRING);
2492                                 goto nfsmout;
2493                         }
2494                         if (!nd->nd_repstat) {
2495                                 nd->nd_repstat = nfsv4_strtouid(nd, cp, j, &uid,
2496                                     p);
2497                                 if (!nd->nd_repstat)
2498                                         nvap->na_uid = uid;
2499                         }
2500                         if (j > NFSV4_SMALLSTR)
2501                                 free(cp, M_NFSSTRING);
2502                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2503                         break;
2504                 case NFSATTRBIT_OWNERGROUP:
2505                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2506                         j = fxdr_unsigned(int, *tl);
2507                         if (j < 0) {
2508                                 error = NFSERR_BADXDR;
2509                                 goto nfsmout;
2510                         }
2511                         if (j > NFSV4_SMALLSTR)
2512                                 cp = malloc(j + 1, M_NFSSTRING, M_WAITOK);
2513                         else
2514                                 cp = namestr;
2515                         error = nfsrv_mtostr(nd, cp, j);
2516                         if (error) {
2517                                 if (j > NFSV4_SMALLSTR)
2518                                         free(cp, M_NFSSTRING);
2519                                 goto nfsmout;
2520                         }
2521                         if (!nd->nd_repstat) {
2522                                 nd->nd_repstat = nfsv4_strtogid(nd, cp, j, &gid,
2523                                     p);
2524                                 if (!nd->nd_repstat)
2525                                         nvap->na_gid = gid;
2526                         }
2527                         if (j > NFSV4_SMALLSTR)
2528                                 free(cp, M_NFSSTRING);
2529                         attrsum += (NFSX_UNSIGNED + NFSM_RNDUP(j));
2530                         break;
2531                 case NFSATTRBIT_SYSTEM:
2532                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2533                         if (!nd->nd_repstat)
2534                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2535                         attrsum += NFSX_UNSIGNED;
2536                         break;
2537                 case NFSATTRBIT_TIMEACCESSSET:
2538                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2539                         attrsum += NFSX_UNSIGNED;
2540                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2541                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2542                             fxdr_nfsv4time(tl, &nvap->na_atime);
2543                             toclient = 1;
2544                             attrsum += NFSX_V4TIME;
2545                         } else {
2546                             vfs_timestamp(&nvap->na_atime);
2547                             nvap->na_vaflags |= VA_UTIMES_NULL;
2548                         }
2549                         break;
2550                 case NFSATTRBIT_TIMEBACKUP:
2551                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2552                         if (!nd->nd_repstat)
2553                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2554                         attrsum += NFSX_V4TIME;
2555                         break;
2556                 case NFSATTRBIT_TIMECREATE:
2557                         NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2558                         if (!nd->nd_repstat)
2559                                 nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2560                         attrsum += NFSX_V4TIME;
2561                         break;
2562                 case NFSATTRBIT_TIMEMODIFYSET:
2563                         NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
2564                         attrsum += NFSX_UNSIGNED;
2565                         if (fxdr_unsigned(int, *tl)==NFSV4SATTRTIME_TOCLIENT) {
2566                             NFSM_DISSECT(tl, u_int32_t *, NFSX_V4TIME);
2567                             fxdr_nfsv4time(tl, &nvap->na_mtime);
2568                             nvap->na_vaflags &= ~VA_UTIMES_NULL;
2569                             attrsum += NFSX_V4TIME;
2570                         } else {
2571                             vfs_timestamp(&nvap->na_mtime);
2572                             if (!toclient)
2573                                 nvap->na_vaflags |= VA_UTIMES_NULL;
2574                         }
2575                         break;
2576                 default:
2577                         nd->nd_repstat = NFSERR_ATTRNOTSUPP;
2578                         /*
2579                          * set bitpos so we drop out of the loop.
2580                          */
2581                         bitpos = NFSATTRBIT_MAX;
2582                         break;
2583                 };
2584         }
2585
2586         /*
2587          * some clients pad the attrlist, so we need to skip over the
2588          * padding.
2589          */
2590         if (attrsum > attrsize) {
2591                 error = NFSERR_BADXDR;
2592         } else {
2593                 attrsize = NFSM_RNDUP(attrsize);
2594                 if (attrsum < attrsize)
2595                         error = nfsm_advance(nd, attrsize - attrsum, -1);
2596         }
2597 nfsmout:
2598         NFSEXITCODE2(error, nd);
2599         return (error);
2600 }
2601
2602 /*
2603  * Check/setup export credentials.
2604  */
2605 int
2606 nfsd_excred(struct nfsrv_descript *nd, struct nfsexstuff *exp,
2607     struct ucred *credanon)
2608 {
2609         int error = 0;
2610
2611         /*
2612          * Check/setup credentials.
2613          */
2614         if (nd->nd_flag & ND_GSS)
2615                 exp->nes_exflag &= ~MNT_EXPORTANON;
2616
2617         /*
2618          * Check to see if the operation is allowed for this security flavor.
2619          * RFC2623 suggests that the NFSv3 Fsinfo RPC be allowed to
2620          * AUTH_NONE or AUTH_SYS for file systems requiring RPCSEC_GSS.
2621          * Also, allow Secinfo, so that it can acquire the correct flavor(s).
2622          */
2623         if (nfsvno_testexp(nd, exp) &&
2624             nd->nd_procnum != NFSV4OP_SECINFO &&
2625             nd->nd_procnum != NFSPROC_FSINFO) {
2626                 if (nd->nd_flag & ND_NFSV4)
2627                         error = NFSERR_WRONGSEC;
2628                 else
2629                         error = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2630                 goto out;
2631         }
2632
2633         /*
2634          * Check to see if the file system is exported V4 only.
2635          */
2636         if (NFSVNO_EXV4ONLY(exp) && !(nd->nd_flag & ND_NFSV4)) {
2637                 error = NFSERR_PROGNOTV4;
2638                 goto out;
2639         }
2640
2641         /*
2642          * Now, map the user credentials.
2643          * (Note that ND_AUTHNONE will only be set for an NFSv3
2644          *  Fsinfo RPC. If set for anything else, this code might need
2645          *  to change.)
2646          */
2647         if (NFSVNO_EXPORTED(exp) &&
2648             ((!(nd->nd_flag & ND_GSS) && nd->nd_cred->cr_uid == 0) ||
2649              NFSVNO_EXPORTANON(exp) ||
2650              (nd->nd_flag & ND_AUTHNONE))) {
2651                 nd->nd_cred->cr_uid = credanon->cr_uid;
2652                 nd->nd_cred->cr_gid = credanon->cr_gid;
2653                 crsetgroups(nd->nd_cred, credanon->cr_ngroups,
2654                     credanon->cr_groups);
2655         }
2656
2657 out:
2658         NFSEXITCODE2(error, nd);
2659         return (error);
2660 }
2661
2662 /*
2663  * Check exports.
2664  */
2665 int
2666 nfsvno_checkexp(struct mount *mp, struct sockaddr *nam, struct nfsexstuff *exp,
2667     struct ucred **credp)
2668 {
2669         int i, error, *secflavors;
2670
2671         error = VFS_CHECKEXP(mp, nam, &exp->nes_exflag, credp,
2672             &exp->nes_numsecflavor, &secflavors);
2673         if (error) {
2674                 if (nfs_rootfhset) {
2675                         exp->nes_exflag = 0;
2676                         exp->nes_numsecflavor = 0;
2677                         error = 0;
2678                 }
2679         } else {
2680                 /* Copy the security flavors. */
2681                 for (i = 0; i < exp->nes_numsecflavor; i++)
2682                         exp->nes_secflavors[i] = secflavors[i];
2683         }
2684         NFSEXITCODE(error);
2685         return (error);
2686 }
2687
2688 /*
2689  * Get a vnode for a file handle and export stuff.
2690  */
2691 int
2692 nfsvno_fhtovp(struct mount *mp, fhandle_t *fhp, struct sockaddr *nam,
2693     int lktype, struct vnode **vpp, struct nfsexstuff *exp,
2694     struct ucred **credp)
2695 {
2696         int i, error, *secflavors;
2697
2698         *credp = NULL;
2699         exp->nes_numsecflavor = 0;
2700         error = VFS_FHTOVP(mp, &fhp->fh_fid, lktype, vpp);
2701         if (error != 0)
2702                 /* Make sure the server replies ESTALE to the client. */
2703                 error = ESTALE;
2704         if (nam && !error) {
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                         } else {
2713                                 vput(*vpp);
2714                         }
2715                 } else {
2716                         /* Copy the security flavors. */
2717                         for (i = 0; i < exp->nes_numsecflavor; i++)
2718                                 exp->nes_secflavors[i] = secflavors[i];
2719                 }
2720         }
2721         NFSEXITCODE(error);
2722         return (error);
2723 }
2724
2725 /*
2726  * nfsd_fhtovp() - convert a fh to a vnode ptr
2727  *      - look up fsid in mount list (if not found ret error)
2728  *      - get vp and export rights by calling nfsvno_fhtovp()
2729  *      - if cred->cr_uid == 0 or MNT_EXPORTANON set it to credanon
2730  *        for AUTH_SYS
2731  *      - if mpp != NULL, return the mount point so that it can
2732  *        be used for vn_finished_write() by the caller
2733  */
2734 void
2735 nfsd_fhtovp(struct nfsrv_descript *nd, struct nfsrvfh *nfp, int lktype,
2736     struct vnode **vpp, struct nfsexstuff *exp,
2737     struct mount **mpp, int startwrite, struct thread *p)
2738 {
2739         struct mount *mp;
2740         struct ucred *credanon;
2741         fhandle_t *fhp;
2742
2743         fhp = (fhandle_t *)nfp->nfsrvfh_data;
2744         /*
2745          * Check for the special case of the nfsv4root_fh.
2746          */
2747         mp = vfs_busyfs(&fhp->fh_fsid);
2748         if (mpp != NULL)
2749                 *mpp = mp;
2750         if (mp == NULL) {
2751                 *vpp = NULL;
2752                 nd->nd_repstat = ESTALE;
2753                 goto out;
2754         }
2755
2756         if (startwrite) {
2757                 vn_start_write(NULL, mpp, V_WAIT);
2758                 if (lktype == LK_SHARED && !(MNT_SHARED_WRITES(mp)))
2759                         lktype = LK_EXCLUSIVE;
2760         }
2761         nd->nd_repstat = nfsvno_fhtovp(mp, fhp, nd->nd_nam, lktype, vpp, exp,
2762             &credanon);
2763         vfs_unbusy(mp);
2764
2765         /*
2766          * For NFSv4 without a pseudo root fs, unexported file handles
2767          * can be returned, so that Lookup works everywhere.
2768          */
2769         if (!nd->nd_repstat && exp->nes_exflag == 0 &&
2770             !(nd->nd_flag & ND_NFSV4)) {
2771                 vput(*vpp);
2772                 nd->nd_repstat = EACCES;
2773         }
2774
2775         /*
2776          * Personally, I've never seen any point in requiring a
2777          * reserved port#, since only in the rare case where the
2778          * clients are all boxes with secure system priviledges,
2779          * does it provide any enhanced security, but... some people
2780          * believe it to be useful and keep putting this code back in.
2781          * (There is also some "security checker" out there that
2782          *  complains if the nfs server doesn't enforce this.)
2783          * However, note the following:
2784          * RFC3530 (NFSv4) specifies that a reserved port# not be
2785          *      required.
2786          * RFC2623 recommends that, if a reserved port# is checked for,
2787          *      that there be a way to turn that off--> ifdef'd.
2788          */
2789 #ifdef NFS_REQRSVPORT
2790         if (!nd->nd_repstat) {
2791                 struct sockaddr_in *saddr;
2792                 struct sockaddr_in6 *saddr6;
2793
2794                 saddr = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in *);
2795                 saddr6 = NFSSOCKADDR(nd->nd_nam, struct sockaddr_in6 *);
2796                 if (!(nd->nd_flag & ND_NFSV4) &&
2797                     ((saddr->sin_family == AF_INET &&
2798                       ntohs(saddr->sin_port) >= IPPORT_RESERVED) ||
2799                      (saddr6->sin6_family == AF_INET6 &&
2800                       ntohs(saddr6->sin6_port) >= IPPORT_RESERVED))) {
2801                         vput(*vpp);
2802                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
2803                 }
2804         }
2805 #endif  /* NFS_REQRSVPORT */
2806
2807         /*
2808          * Check/setup credentials.
2809          */
2810         if (!nd->nd_repstat) {
2811                 nd->nd_saveduid = nd->nd_cred->cr_uid;
2812                 nd->nd_repstat = nfsd_excred(nd, exp, credanon);
2813                 if (nd->nd_repstat)
2814                         vput(*vpp);
2815         }
2816         if (credanon != NULL)
2817                 crfree(credanon);
2818         if (nd->nd_repstat) {
2819                 if (startwrite)
2820                         vn_finished_write(mp);
2821                 *vpp = NULL;
2822                 if (mpp != NULL)
2823                         *mpp = NULL;
2824         }
2825
2826 out:
2827         NFSEXITCODE2(0, nd);
2828 }
2829
2830 /*
2831  * glue for fp.
2832  */
2833 static int
2834 fp_getfvp(struct thread *p, int fd, struct file **fpp, struct vnode **vpp)
2835 {
2836         struct filedesc *fdp;
2837         struct file *fp;
2838         int error = 0;
2839
2840         fdp = p->td_proc->p_fd;
2841         if (fd < 0 || fd >= fdp->fd_nfiles ||
2842             (fp = fdp->fd_ofiles[fd].fde_file) == NULL) {
2843                 error = EBADF;
2844                 goto out;
2845         }
2846         *fpp = fp;
2847
2848 out:
2849         NFSEXITCODE(error);
2850         return (error);
2851 }
2852
2853 /*
2854  * Called from nfssvc() to update the exports list. Just call
2855  * vfs_export(). This has to be done, since the v4 root fake fs isn't
2856  * in the mount list.
2857  */
2858 int
2859 nfsrv_v4rootexport(void *argp, struct ucred *cred, struct thread *p)
2860 {
2861         struct nfsex_args *nfsexargp = (struct nfsex_args *)argp;
2862         int error = 0;
2863         struct nameidata nd;
2864         fhandle_t fh;
2865
2866         error = vfs_export(&nfsv4root_mnt, &nfsexargp->export);
2867         if ((nfsexargp->export.ex_flags & MNT_DELEXPORT) != 0)
2868                 nfs_rootfhset = 0;
2869         else if (error == 0) {
2870                 if (nfsexargp->fspec == NULL) {
2871                         error = EPERM;
2872                         goto out;
2873                 }
2874                 /*
2875                  * If fspec != NULL, this is the v4root path.
2876                  */
2877                 NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE,
2878                     nfsexargp->fspec, p);
2879                 if ((error = namei(&nd)) != 0)
2880                         goto out;
2881                 error = nfsvno_getfh(nd.ni_vp, &fh, p);
2882                 vrele(nd.ni_vp);
2883                 if (!error) {
2884                         nfs_rootfh.nfsrvfh_len = NFSX_MYFH;
2885                         NFSBCOPY((caddr_t)&fh,
2886                             nfs_rootfh.nfsrvfh_data,
2887                             sizeof (fhandle_t));
2888                         nfs_rootfhset = 1;
2889                 }
2890         }
2891
2892 out:
2893         NFSEXITCODE(error);
2894         return (error);
2895 }
2896
2897 /*
2898  * This function needs to test to see if the system is near its limit
2899  * for memory allocation via malloc() or mget() and return True iff
2900  * either of these resources are near their limit.
2901  * XXX (For now, this is just a stub.)
2902  */
2903 int nfsrv_testmalloclimit = 0;
2904 int
2905 nfsrv_mallocmget_limit(void)
2906 {
2907         static int printmesg = 0;
2908         static int testval = 1;
2909
2910         if (nfsrv_testmalloclimit && (testval++ % 1000) == 0) {
2911                 if ((printmesg++ % 100) == 0)
2912                         printf("nfsd: malloc/mget near limit\n");
2913                 return (1);
2914         }
2915         return (0);
2916 }
2917
2918 /*
2919  * BSD specific initialization of a mount point.
2920  */
2921 void
2922 nfsd_mntinit(void)
2923 {
2924         static int inited = 0;
2925
2926         if (inited)
2927                 return;
2928         inited = 1;
2929         nfsv4root_mnt.mnt_flag = (MNT_RDONLY | MNT_EXPORTED);
2930         TAILQ_INIT(&nfsv4root_mnt.mnt_nvnodelist);
2931         TAILQ_INIT(&nfsv4root_mnt.mnt_activevnodelist);
2932         nfsv4root_mnt.mnt_export = NULL;
2933         TAILQ_INIT(&nfsv4root_opt);
2934         TAILQ_INIT(&nfsv4root_newopt);
2935         nfsv4root_mnt.mnt_opt = &nfsv4root_opt;
2936         nfsv4root_mnt.mnt_optnew = &nfsv4root_newopt;
2937         nfsv4root_mnt.mnt_nvnodelistsize = 0;
2938         nfsv4root_mnt.mnt_activevnodelistsize = 0;
2939 }
2940
2941 /*
2942  * Get a vnode for a file handle, without checking exports, etc.
2943  */
2944 struct vnode *
2945 nfsvno_getvp(fhandle_t *fhp)
2946 {
2947         struct mount *mp;
2948         struct vnode *vp;
2949         int error;
2950
2951         mp = vfs_busyfs(&fhp->fh_fsid);
2952         if (mp == NULL)
2953                 return (NULL);
2954         error = VFS_FHTOVP(mp, &fhp->fh_fid, LK_EXCLUSIVE, &vp);
2955         vfs_unbusy(mp);
2956         if (error)
2957                 return (NULL);
2958         return (vp);
2959 }
2960
2961 /*
2962  * Do a local VOP_ADVLOCK().
2963  */
2964 int
2965 nfsvno_advlock(struct vnode *vp, int ftype, u_int64_t first,
2966     u_int64_t end, struct thread *td)
2967 {
2968         int error = 0;
2969         struct flock fl;
2970         u_int64_t tlen;
2971
2972         if (nfsrv_dolocallocks == 0)
2973                 goto out;
2974         ASSERT_VOP_UNLOCKED(vp, "nfsvno_advlock: vp locked");
2975
2976         fl.l_whence = SEEK_SET;
2977         fl.l_type = ftype;
2978         fl.l_start = (off_t)first;
2979         if (end == NFS64BITSSET) {
2980                 fl.l_len = 0;
2981         } else {
2982                 tlen = end - first;
2983                 fl.l_len = (off_t)tlen;
2984         }
2985         /*
2986          * For FreeBSD8, the l_pid and l_sysid must be set to the same
2987          * values for all calls, so that all locks will be held by the
2988          * nfsd server. (The nfsd server handles conflicts between the
2989          * various clients.)
2990          * Since an NFSv4 lockowner is a ClientID plus an array of up to 1024
2991          * bytes, so it can't be put in l_sysid.
2992          */
2993         if (nfsv4_sysid == 0)
2994                 nfsv4_sysid = nlm_acquire_next_sysid();
2995         fl.l_pid = (pid_t)0;
2996         fl.l_sysid = (int)nfsv4_sysid;
2997
2998         if (ftype == F_UNLCK)
2999                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_UNLCK, &fl,
3000                     (F_POSIX | F_REMOTE));
3001         else
3002                 error = VOP_ADVLOCK(vp, (caddr_t)td->td_proc, F_SETLK, &fl,
3003                     (F_POSIX | F_REMOTE));
3004
3005 out:
3006         NFSEXITCODE(error);
3007         return (error);
3008 }
3009
3010 /*
3011  * Check the nfsv4 root exports.
3012  */
3013 int
3014 nfsvno_v4rootexport(struct nfsrv_descript *nd)
3015 {
3016         struct ucred *credanon;
3017         int exflags, error = 0, numsecflavor, *secflavors, i;
3018
3019         error = vfs_stdcheckexp(&nfsv4root_mnt, nd->nd_nam, &exflags,
3020             &credanon, &numsecflavor, &secflavors);
3021         if (error) {
3022                 error = NFSERR_PROGUNAVAIL;
3023                 goto out;
3024         }
3025         if (credanon != NULL)
3026                 crfree(credanon);
3027         for (i = 0; i < numsecflavor; i++) {
3028                 if (secflavors[i] == AUTH_SYS)
3029                         nd->nd_flag |= ND_EXAUTHSYS;
3030                 else if (secflavors[i] == RPCSEC_GSS_KRB5)
3031                         nd->nd_flag |= ND_EXGSS;
3032                 else if (secflavors[i] == RPCSEC_GSS_KRB5I)
3033                         nd->nd_flag |= ND_EXGSSINTEGRITY;
3034                 else if (secflavors[i] == RPCSEC_GSS_KRB5P)
3035                         nd->nd_flag |= ND_EXGSSPRIVACY;
3036         }
3037
3038 out:
3039         NFSEXITCODE(error);
3040         return (error);
3041 }
3042
3043 /*
3044  * Nfs server psuedo system call for the nfsd's
3045  */
3046 /*
3047  * MPSAFE
3048  */
3049 static int
3050 nfssvc_nfsd(struct thread *td, struct nfssvc_args *uap)
3051 {
3052         struct file *fp;
3053         struct nfsd_addsock_args sockarg;
3054         struct nfsd_nfsd_args nfsdarg;
3055         cap_rights_t rights;
3056         int error;
3057
3058         if (uap->flag & NFSSVC_NFSDADDSOCK) {
3059                 error = copyin(uap->argp, (caddr_t)&sockarg, sizeof (sockarg));
3060                 if (error)
3061                         goto out;
3062                 /*
3063                  * Since we don't know what rights might be required,
3064                  * pretend that we need them all. It is better to be too
3065                  * careful than too reckless.
3066                  */
3067                 error = fget(td, sockarg.sock,
3068                     cap_rights_init(&rights, CAP_SOCK_SERVER), &fp);
3069                 if (error != 0)
3070                         goto out;
3071                 if (fp->f_type != DTYPE_SOCKET) {
3072                         fdrop(fp, td);
3073                         error = EPERM;
3074                         goto out;
3075                 }
3076                 error = nfsrvd_addsock(fp);
3077                 fdrop(fp, td);
3078         } else if (uap->flag & NFSSVC_NFSDNFSD) {
3079                 if (uap->argp == NULL) {
3080                         error = EINVAL;
3081                         goto out;
3082                 }
3083                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
3084                     sizeof (nfsdarg));
3085                 if (error)
3086                         goto out;
3087                 error = nfsrvd_nfsd(td, &nfsdarg);
3088         } else {
3089                 error = nfssvc_srvcall(td, uap, td->td_ucred);
3090         }
3091
3092 out:
3093         NFSEXITCODE(error);
3094         return (error);
3095 }
3096
3097 static int
3098 nfssvc_srvcall(struct thread *p, struct nfssvc_args *uap, struct ucred *cred)
3099 {
3100         struct nfsex_args export;
3101         struct file *fp = NULL;
3102         int stablefd, len;
3103         struct nfsd_clid adminrevoke;
3104         struct nfsd_dumplist dumplist;
3105         struct nfsd_dumpclients *dumpclients;
3106         struct nfsd_dumplocklist dumplocklist;
3107         struct nfsd_dumplocks *dumplocks;
3108         struct nameidata nd;
3109         vnode_t vp;
3110         int error = EINVAL, igotlock;
3111         struct proc *procp;
3112         static int suspend_nfsd = 0;
3113
3114         if (uap->flag & NFSSVC_PUBLICFH) {
3115                 NFSBZERO((caddr_t)&nfs_pubfh.nfsrvfh_data,
3116                     sizeof (fhandle_t));
3117                 error = copyin(uap->argp,
3118                     &nfs_pubfh.nfsrvfh_data, sizeof (fhandle_t));
3119                 if (!error)
3120                         nfs_pubfhset = 1;
3121         } else if (uap->flag & NFSSVC_V4ROOTEXPORT) {
3122                 error = copyin(uap->argp,(caddr_t)&export,
3123                     sizeof (struct nfsex_args));
3124                 if (!error)
3125                         error = nfsrv_v4rootexport(&export, cred, p);
3126         } else if (uap->flag & NFSSVC_NOPUBLICFH) {
3127                 nfs_pubfhset = 0;
3128                 error = 0;
3129         } else if (uap->flag & NFSSVC_STABLERESTART) {
3130                 error = copyin(uap->argp, (caddr_t)&stablefd,
3131                     sizeof (int));
3132                 if (!error)
3133                         error = fp_getfvp(p, stablefd, &fp, &vp);
3134                 if (!error && (NFSFPFLAG(fp) & (FREAD | FWRITE)) != (FREAD | FWRITE))
3135                         error = EBADF;
3136                 if (!error && newnfs_numnfsd != 0)
3137                         error = EPERM;
3138                 if (!error) {
3139                         nfsrv_stablefirst.nsf_fp = fp;
3140                         nfsrv_setupstable(p);
3141                 }
3142         } else if (uap->flag & NFSSVC_ADMINREVOKE) {
3143                 error = copyin(uap->argp, (caddr_t)&adminrevoke,
3144                     sizeof (struct nfsd_clid));
3145                 if (!error)
3146                         error = nfsrv_adminrevoke(&adminrevoke, p);
3147         } else if (uap->flag & NFSSVC_DUMPCLIENTS) {
3148                 error = copyin(uap->argp, (caddr_t)&dumplist,
3149                     sizeof (struct nfsd_dumplist));
3150                 if (!error && (dumplist.ndl_size < 1 ||
3151                         dumplist.ndl_size > NFSRV_MAXDUMPLIST))
3152                         error = EPERM;
3153                 if (!error) {
3154                     len = sizeof (struct nfsd_dumpclients) * dumplist.ndl_size;
3155                     dumpclients = (struct nfsd_dumpclients *)malloc(len,
3156                         M_TEMP, M_WAITOK);
3157                     nfsrv_dumpclients(dumpclients, dumplist.ndl_size);
3158                     error = copyout(dumpclients,
3159                         CAST_USER_ADDR_T(dumplist.ndl_list), len);
3160                     free((caddr_t)dumpclients, M_TEMP);
3161                 }
3162         } else if (uap->flag & NFSSVC_DUMPLOCKS) {
3163                 error = copyin(uap->argp, (caddr_t)&dumplocklist,
3164                     sizeof (struct nfsd_dumplocklist));
3165                 if (!error && (dumplocklist.ndllck_size < 1 ||
3166                         dumplocklist.ndllck_size > NFSRV_MAXDUMPLIST))
3167                         error = EPERM;
3168                 if (!error)
3169                         error = nfsrv_lookupfilename(&nd,
3170                                 dumplocklist.ndllck_fname, p);
3171                 if (!error) {
3172                         len = sizeof (struct nfsd_dumplocks) *
3173                                 dumplocklist.ndllck_size;
3174                         dumplocks = (struct nfsd_dumplocks *)malloc(len,
3175                                 M_TEMP, M_WAITOK);
3176                         nfsrv_dumplocks(nd.ni_vp, dumplocks,
3177                             dumplocklist.ndllck_size, p);
3178                         vput(nd.ni_vp);
3179                         error = copyout(dumplocks,
3180                             CAST_USER_ADDR_T(dumplocklist.ndllck_list), len);
3181                         free((caddr_t)dumplocks, M_TEMP);
3182                 }
3183         } else if (uap->flag & NFSSVC_BACKUPSTABLE) {
3184                 procp = p->td_proc;
3185                 PROC_LOCK(procp);
3186                 nfsd_master_pid = procp->p_pid;
3187                 bcopy(procp->p_comm, nfsd_master_comm, MAXCOMLEN + 1);
3188                 nfsd_master_start = procp->p_stats->p_start;
3189                 nfsd_master_proc = procp;
3190                 PROC_UNLOCK(procp);
3191         } else if ((uap->flag & NFSSVC_SUSPENDNFSD) != 0) {
3192                 NFSLOCKV4ROOTMUTEX();
3193                 if (suspend_nfsd == 0) {
3194                         /* Lock out all nfsd threads */
3195                         do {
3196                                 igotlock = nfsv4_lock(&nfsd_suspend_lock, 1,
3197                                     NULL, NFSV4ROOTLOCKMUTEXPTR, NULL);
3198                         } while (igotlock == 0 && suspend_nfsd == 0);
3199                         suspend_nfsd = 1;
3200                 }
3201                 NFSUNLOCKV4ROOTMUTEX();
3202                 error = 0;
3203         } else if ((uap->flag & NFSSVC_RESUMENFSD) != 0) {
3204                 NFSLOCKV4ROOTMUTEX();
3205                 if (suspend_nfsd != 0) {
3206                         nfsv4_unlock(&nfsd_suspend_lock, 0);
3207                         suspend_nfsd = 0;
3208                 }
3209                 NFSUNLOCKV4ROOTMUTEX();
3210                 error = 0;
3211         }
3212
3213         NFSEXITCODE(error);
3214         return (error);
3215 }
3216
3217 /*
3218  * Check exports.
3219  * Returns 0 if ok, 1 otherwise.
3220  */
3221 int
3222 nfsvno_testexp(struct nfsrv_descript *nd, struct nfsexstuff *exp)
3223 {
3224         int i;
3225
3226         /*
3227          * This seems odd, but allow the case where the security flavor
3228          * list is empty. This happens when NFSv4 is traversing non-exported
3229          * file systems. Exported file systems should always have a non-empty
3230          * security flavor list.
3231          */
3232         if (exp->nes_numsecflavor == 0)
3233                 return (0);
3234
3235         for (i = 0; i < exp->nes_numsecflavor; i++) {
3236                 /*
3237                  * The tests for privacy and integrity must be first,
3238                  * since ND_GSS is set for everything but AUTH_SYS.
3239                  */
3240                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5P &&
3241                     (nd->nd_flag & ND_GSSPRIVACY))
3242                         return (0);
3243                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5I &&
3244                     (nd->nd_flag & ND_GSSINTEGRITY))
3245                         return (0);
3246                 if (exp->nes_secflavors[i] == RPCSEC_GSS_KRB5 &&
3247                     (nd->nd_flag & ND_GSS))
3248                         return (0);
3249                 if (exp->nes_secflavors[i] == AUTH_SYS &&
3250                     (nd->nd_flag & ND_GSS) == 0)
3251                         return (0);
3252         }
3253         return (1);
3254 }
3255
3256 /*
3257  * Calculate a hash value for the fid in a file handle.
3258  */
3259 uint32_t
3260 nfsrv_hashfh(fhandle_t *fhp)
3261 {
3262         uint32_t hashval;
3263
3264         hashval = hash32_buf(&fhp->fh_fid, sizeof(struct fid), 0);
3265         return (hashval);
3266 }
3267
3268 /*
3269  * Calculate a hash value for the sessionid.
3270  */
3271 uint32_t
3272 nfsrv_hashsessionid(uint8_t *sessionid)
3273 {
3274         uint32_t hashval;
3275
3276         hashval = hash32_buf(sessionid, NFSX_V4SESSIONID, 0);
3277         return (hashval);
3278 }
3279
3280 /*
3281  * Signal the userland master nfsd to backup the stable restart file.
3282  */
3283 void
3284 nfsrv_backupstable(void)
3285 {
3286         struct proc *procp;
3287
3288         if (nfsd_master_proc != NULL) {
3289                 procp = pfind(nfsd_master_pid);
3290                 /* Try to make sure it is the correct process. */
3291                 if (procp == nfsd_master_proc &&
3292                     procp->p_stats->p_start.tv_sec ==
3293                     nfsd_master_start.tv_sec &&
3294                     procp->p_stats->p_start.tv_usec ==
3295                     nfsd_master_start.tv_usec &&
3296                     strcmp(procp->p_comm, nfsd_master_comm) == 0)
3297                         kern_psignal(procp, SIGUSR2);
3298                 else
3299                         nfsd_master_proc = NULL;
3300
3301                 if (procp != NULL)
3302                         PROC_UNLOCK(procp);
3303         }
3304 }
3305
3306 extern int (*nfsd_call_nfsd)(struct thread *, struct nfssvc_args *);
3307
3308 /*
3309  * Called once to initialize data structures...
3310  */
3311 static int
3312 nfsd_modevent(module_t mod, int type, void *data)
3313 {
3314         int error = 0, i;
3315         static int loaded = 0;
3316
3317         switch (type) {
3318         case MOD_LOAD:
3319                 if (loaded)
3320                         goto out;
3321                 newnfs_portinit();
3322                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3323                         mtx_init(&nfsrchash_table[i].mtx, "nfsrtc", NULL,
3324                             MTX_DEF);
3325                         mtx_init(&nfsrcahash_table[i].mtx, "nfsrtca", NULL,
3326                             MTX_DEF);
3327                 }
3328                 mtx_init(&nfsrc_udpmtx, "nfsuc", NULL, MTX_DEF);
3329                 mtx_init(&nfs_v4root_mutex, "nfs4rt", NULL, MTX_DEF);
3330                 mtx_init(&nfsv4root_mnt.mnt_mtx, "nfs4mnt", NULL, MTX_DEF);
3331                 lockinit(&nfsv4root_mnt.mnt_explock, PVFS, "explock", 0, 0);
3332                 nfsrvd_initcache();
3333                 nfsd_init();
3334                 NFSD_LOCK();
3335                 nfsrvd_init(0);
3336                 NFSD_UNLOCK();
3337                 nfsd_mntinit();
3338 #ifdef VV_DISABLEDELEG
3339                 vn_deleg_ops.vndeleg_recall = nfsd_recalldelegation;
3340                 vn_deleg_ops.vndeleg_disable = nfsd_disabledelegation;
3341 #endif
3342                 nfsd_call_servertimer = nfsrv_servertimer;
3343                 nfsd_call_nfsd = nfssvc_nfsd;
3344                 loaded = 1;
3345                 break;
3346
3347         case MOD_UNLOAD:
3348                 if (newnfs_numnfsd != 0) {
3349                         error = EBUSY;
3350                         break;
3351                 }
3352
3353 #ifdef VV_DISABLEDELEG
3354                 vn_deleg_ops.vndeleg_recall = NULL;
3355                 vn_deleg_ops.vndeleg_disable = NULL;
3356 #endif
3357                 nfsd_call_servertimer = NULL;
3358                 nfsd_call_nfsd = NULL;
3359
3360                 /* Clean out all NFSv4 state. */
3361                 nfsrv_throwawayallstate(curthread);
3362
3363                 /* Clean the NFS server reply cache */
3364                 nfsrvd_cleancache();
3365
3366                 /* Free up the krpc server pool. */
3367                 if (nfsrvd_pool != NULL)
3368                         svcpool_destroy(nfsrvd_pool);
3369
3370                 /* and get rid of the locks */
3371                 for (i = 0; i < NFSRVCACHE_HASHSIZE; i++) {
3372                         mtx_destroy(&nfsrchash_table[i].mtx);
3373                         mtx_destroy(&nfsrcahash_table[i].mtx);
3374                 }
3375                 mtx_destroy(&nfsrc_udpmtx);
3376                 mtx_destroy(&nfs_v4root_mutex);
3377                 mtx_destroy(&nfsv4root_mnt.mnt_mtx);
3378                 for (i = 0; i < nfsrv_sessionhashsize; i++)
3379                         mtx_destroy(&nfssessionhash[i].mtx);
3380                 lockdestroy(&nfsv4root_mnt.mnt_explock);
3381                 free(nfsclienthash, M_NFSDCLIENT);
3382                 free(nfslockhash, M_NFSDLOCKFILE);
3383                 free(nfssessionhash, M_NFSDSESSION);
3384                 loaded = 0;
3385                 break;
3386         default:
3387                 error = EOPNOTSUPP;
3388                 break;
3389         }
3390
3391 out:
3392         NFSEXITCODE(error);
3393         return (error);
3394 }
3395 static moduledata_t nfsd_mod = {
3396         "nfsd",
3397         nfsd_modevent,
3398         NULL,
3399 };
3400 DECLARE_MODULE(nfsd, nfsd_mod, SI_SUB_VFS, SI_ORDER_ANY);
3401
3402 /* So that loader and kldload(2) can find us, wherever we are.. */
3403 MODULE_VERSION(nfsd, 1);
3404 MODULE_DEPEND(nfsd, nfscommon, 1, 1, 1);
3405 MODULE_DEPEND(nfsd, nfslock, 1, 1, 1);
3406 MODULE_DEPEND(nfsd, nfslockd, 1, 1, 1);
3407 MODULE_DEPEND(nfsd, krpc, 1, 1, 1);
3408 MODULE_DEPEND(nfsd, nfssvc, 1, 1, 1);
3409