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