sys/vfs/nfs/nfs_syscalls.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  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
  37  * $FreeBSD: src/sys/nfs/nfs_syscalls.c,v 1.58.2.1 2000/11/26 02:30:06 dillon Exp $
  38  * $DragonFly: src/sys/vfs/nfs/nfs_syscalls.c,v 1.31 2008/01/05 14:02:41 swildner Exp $
  39  */
  40
  41 #include <sys/param.h>
  42 #include <sys/systm.h>
  43 #include <sys/sysproto.h>
  44 #include <sys/kernel.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/file.h>
  47 #include <sys/filedesc.h>
  48 #include <sys/vnode.h>
  49 #include <sys/malloc.h>
  50 #include <sys/mount.h>
  51 #include <sys/proc.h>
  52 #include <sys/priv.h>
  53 #include <sys/buf.h>
  54 #include <sys/mbuf.h>
  55 #include <sys/resourcevar.h>
  56 #include <sys/socket.h>
  57 #include <sys/socketvar.h>
  58 #include <sys/domain.h>
  59 #include <sys/protosw.h>
  60 #include <sys/nlookup.h>
  61 #include <sys/mutex.h>
  62 #include <vm/vm_zone.h>
  63
  64 #include <sys/mutex2.h>
  65 #include <sys/thread2.h>
  66
  67 #include <netinet/in.h>
  68 #include <netinet/tcp.h>
  69 #include "xdr_subs.h"
  70 #include "rpcv2.h"
  71 #include "nfsproto.h"
  72 #include "nfs.h"
  73 #include "nfsm_subs.h"
  74 #include "nfsrvcache.h"
  75 #include "nfsmount.h"
  76 #include "nfsnode.h"
  77 #include "nfsrtt.h"
  78
  79 #include <sys/thread2.h>
  80
  81 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
  82
  83 static int nuidhash_max = NFS_MAXUIDHASH;
  84
  85 #ifndef NFS_NOSERVER
  86 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
  87 #endif
  88
  89 #define TRUE    1
  90 #define FALSE   0
  91
  92 SYSCTL_DECL(_vfs_nfs);
  93
  94 #ifndef NFS_NOSERVER
  95 int nfsd_waiting = 0;
  96 static struct nfsdrt nfsdrt;
  97 static int nfs_numnfsd = 0;
  98 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
  99                              int cacherep);
 100 static int      nfssvc_addsock (struct file *, struct sockaddr *,
 101                                     struct thread *);
 102 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
 103
 104 static int nfs_privport = 0;
 105 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
 106 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
 107 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
 108 int     nfs_soreserve = NFS_MAXPACKET * NFS_MAXASYNCBIO;
 109 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, "");
 110
 111 /*
 112  * NFS server system calls
 113  */
 114
 115 #endif /* NFS_NOSERVER */
 116 /*
 117  * nfssvc_args(int flag, caddr_t argp)
 118  *
 119  * Nfs server psuedo system call for the nfsd's
 120  * Based on the flag value it either:
 121  * - adds a socket to the selection list
 122  * - remains in the kernel as an nfsd
 123  * - remains in the kernel as an nfsiod
 124  *
 125  * MPALMOSTSAFE
 126  */
 127 int
 128 sys_nfssvc(struct nfssvc_args *uap)
 129 {
 130 #ifndef NFS_NOSERVER
 131         struct nlookupdata nd;
 132         struct file *fp;
 133         struct sockaddr *nam;
 134         struct nfsd_args nfsdarg;
 135         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
 136         struct nfsd_cargs ncd;
 137         struct nfsd *nfsd;
 138         struct nfssvc_sock *slp;
 139         struct nfsuid *nuidp;
 140         struct nfsmount *nmp;
 141         struct vnode *vp;
 142 #endif /* NFS_NOSERVER */
 143         int error;
 144         struct thread *td = curthread;
 145
 146         /*
 147          * Must be super user
 148          */
 149         error = priv_check(td, PRIV_ROOT);
 150         if (error)
 151                 return (error);
 152
 153         lwkt_gettoken(&nfs_token);
 154
 155         while (nfssvc_sockhead_flag & SLP_INIT) {
 156                 nfssvc_sockhead_flag |= SLP_WANTINIT;
 157                 tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
 158         }
 159         if (uap->flag & NFSSVC_BIOD)
 160                 error = ENXIO;          /* no longer need nfsiod's */
 161 #ifdef NFS_NOSERVER
 162         else
 163                 error = ENXIO;
 164 #else /* !NFS_NOSERVER */
 165         else if (uap->flag & NFSSVC_MNTD) {
 166                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
 167                 if (error)
 168                         goto done;
 169                 vp = NULL;
 170                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE,
 171                                         NLC_FOLLOW);
 172                 if (error == 0)
 173                         error = nlookup(&nd);
 174                 if (error == 0)
 175                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
 176                 nlookup_done(&nd);
 177                 if (error)
 178                         goto done;
 179
 180                 if ((vp->v_flag & VROOT) == 0)
 181                         error = EINVAL;
 182                 nmp = VFSTONFS(vp->v_mount);
 183                 vput(vp);
 184                 if (error)
 185                         goto done;
 186                 if ((nmp->nm_state & NFSSTA_MNTD) &&
 187                         (uap->flag & NFSSVC_GOTAUTH) == 0) {
 188                         error = 0;
 189                         goto done;
 190                 }
 191                 nmp->nm_state |= NFSSTA_MNTD;
 192                 error = nfs_clientd(nmp, td->td_ucred, &ncd, uap->flag,
 193                                     uap->argp, td);
 194         } else if (uap->flag & NFSSVC_ADDSOCK) {
 195                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
 196                 if (error)
 197                         goto done;
 198                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
 199                 if (error)
 200                         goto done;
 201                 /*
 202                  * Get the client address for connected sockets.
 203                  */
 204                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
 205                         nam = NULL;
 206                 else {
 207                         error = getsockaddr(&nam, nfsdarg.name,
 208                                             nfsdarg.namelen);
 209                         if (error) {
 210                                 fdrop(fp);
 211                                 goto done;
 212                         }
 213                 }
 214                 error = nfssvc_addsock(fp, nam, td);
 215                 fdrop(fp);
 216         } else {
 217                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
 218                 if (error)
 219                         goto done;
 220                 if ((uap->flag & NFSSVC_AUTHIN) &&
 221                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
 222                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
 223                         slp = nfsd->nfsd_slp;
 224
 225                         /*
 226                          * First check to see if another nfsd has already
 227                          * added this credential.
 228                          */
 229                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
 230                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
 231                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
 232                                     (!nfsd->nfsd_nd->nd_nam2 ||
 233                                      netaddr_match(NU_NETFAM(nuidp),
 234                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
 235                                         break;
 236                         }
 237                         if (nuidp) {
 238                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
 239                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 240                         } else {
 241                             /*
 242                              * Nope, so we will.
 243                              */
 244                             if (slp->ns_numuids < nuidhash_max) {
 245                                 slp->ns_numuids++;
 246                                 nuidp = (struct nfsuid *)
 247                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
 248                                         M_WAITOK);
 249                             } else
 250                                 nuidp = NULL;
 251                             if ((slp->ns_flag & SLP_VALID) == 0) {
 252                                 if (nuidp)
 253                                     kfree((caddr_t)nuidp, M_NFSUID);
 254                             } else {
 255                                 if (nuidp == NULL) {
 256                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
 257                                     LIST_REMOVE(nuidp, nu_hash);
 258                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
 259                                         nu_lru);
 260                                     if (nuidp->nu_flag & NU_NAM)
 261                                         FREE(nuidp->nu_nam, M_SONAME);
 262                                 }
 263                                 nuidp->nu_flag = 0;
 264                                 nuidp->nu_cr = nsd->nsd_cr;
 265                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
 266                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
 267                                 nuidp->nu_cr.cr_ref = 1;
 268                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
 269                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
 270                                 /*
 271                                  * and save the session key in nu_key.
 272                                  */
 273                                 bcopy(nsd->nsd_key, nuidp->nu_key,
 274                                     sizeof (nsd->nsd_key));
 275                                 if (nfsd->nfsd_nd->nd_nam2) {
 276                                     struct sockaddr_in *saddr;
 277
 278                                     saddr = (struct sockaddr_in *)
 279                                             nfsd->nfsd_nd->nd_nam2;
 280                                     switch (saddr->sin_family) {
 281                                     case AF_INET:
 282                                         nuidp->nu_flag |= NU_INETADDR;
 283                                         nuidp->nu_inetaddr =
 284                                              saddr->sin_addr.s_addr;
 285                                         break;
 286                                     case AF_ISO:
 287                                     default:
 288                                         nuidp->nu_flag |= NU_NAM;
 289                                         nuidp->nu_nam =
 290                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
 291                                         break;
 292                                     };
 293                                 }
 294                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
 295                                         nu_lru);
 296                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
 297                                         nuidp, nu_hash);
 298                                 nfsrv_setcred(&nuidp->nu_cr,
 299                                     &nfsd->nfsd_nd->nd_cr);
 300                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 301                             }
 302                         }
 303                 }
 304                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
 305                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
 306                 error = nfssvc_nfsd(nsd, uap->argp, td);
 307         }
 308 #endif /* NFS_NOSERVER */
 309         if (error == EINTR || error == ERESTART)
 310                 error = 0;
 311 done:
 312         lwkt_reltoken(&nfs_token);
 313         return (error);
 314 }
 315
 316 #ifndef NFS_NOSERVER
 317 /*
 318  * Adds a socket to the list for servicing by nfsds.
 319  */
 320 static int
 321 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
 322 {
 323         int siz;
 324         struct nfssvc_sock *slp;
 325         struct socket *so;
 326         int error;
 327
 328         so = (struct socket *)fp->f_data;
 329 #if 0
 330         tslp = NULL;
 331         /*
 332          * Add it to the list, as required.
 333          */
 334         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
 335                 tslp = nfs_udpsock;
 336                 if (tslp->ns_flag & SLP_VALID) {
 337                         if (mynam != NULL)
 338                                 FREE(mynam, M_SONAME);
 339                         return (EPERM);
 340                 }
 341         }
 342 #endif
 343         /*
 344          * Reserve buffer space in the socket.  Note that due to bugs in
 345          * Linux's delayed-ack code, serious performance degredation may
 346          * occur with linux hosts if the minimum is used.
 347          *
 348          * NFS sockets are not limited to the standard sb_max or by
 349          * resource limits.
 350          */
 351         if (so->so_type == SOCK_STREAM)
 352                 siz = NFS_MAXPACKET + sizeof (u_long);
 353         else
 354                 siz = NFS_MAXPACKET;
 355         if (siz < nfs_soreserve)
 356             siz = nfs_soreserve;
 357
 358         error = soreserve(so, siz, siz, NULL);
 359         if (error) {
 360                 if (mynam != NULL)
 361                         FREE(mynam, M_SONAME);
 362                 return (error);
 363         }
 364
 365         /*
 366          * Set protocol specific options { for now TCP only } and
 367          * reserve some space. For datagram sockets, this can get called
 368          * repeatedly for the same socket, but that isn't harmful.
 369          */
 370         if (so->so_type == SOCK_STREAM) {
 371                 struct sockopt sopt;
 372                 int val;
 373
 374                 bzero(&sopt, sizeof sopt);
 375                 sopt.sopt_level = SOL_SOCKET;
 376                 sopt.sopt_name = SO_KEEPALIVE;
 377                 sopt.sopt_val = &val;
 378                 sopt.sopt_valsize = sizeof val;
 379                 val = 1;
 380                 sosetopt(so, &sopt);
 381         }
 382         if (so->so_proto->pr_domain->dom_family == AF_INET &&
 383             so->so_proto->pr_protocol == IPPROTO_TCP) {
 384                 struct sockopt sopt;
 385                 int val;
 386
 387                 bzero(&sopt, sizeof sopt);
 388                 sopt.sopt_level = IPPROTO_TCP;
 389                 sopt.sopt_name = TCP_NODELAY;
 390                 sopt.sopt_val = &val;
 391                 sopt.sopt_valsize = sizeof val;
 392                 val = 1;
 393                 sosetopt(so, &sopt);
 394         }
 395         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
 396         so->so_rcv.ssb_timeo = 0;
 397         atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR);
 398         so->so_snd.ssb_timeo = 0;
 399
 400         slp = (struct nfssvc_sock *)kmalloc(sizeof (struct nfssvc_sock),
 401             M_NFSSVC, M_WAITOK | M_ZERO);
 402         mtx_init(&slp->ns_solock);
 403         STAILQ_INIT(&slp->ns_rec);
 404         TAILQ_INIT(&slp->ns_uidlruhead);
 405         lwkt_token_init(&slp->ns_token, 1, "nfssrv_token");
 406
 407         lwkt_gettoken(&nfs_token);
 408         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
 409         nfsrv_slpref(slp);
 410         lwkt_gettoken(&slp->ns_token);
 411
 412         slp->ns_so = so;
 413         slp->ns_nam = mynam;
 414         fp->f_count++;
 415         slp->ns_fp = fp;
 416
 417         so->so_upcallarg = (caddr_t)slp;
 418         so->so_upcall = nfsrv_rcv_upcall;
 419         atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
 420         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
 421         nfsrv_wakenfsd(slp, 1);
 422
 423         lwkt_reltoken(&slp->ns_token);
 424         lwkt_reltoken(&nfs_token);
 425
 426         return (0);
 427 }
 428
 429 /*
 430  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 431  * until it is killed by a signal.
 432  */
 433 static int
 434 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
 435 {
 436         int siz;
 437         struct nfssvc_sock *slp;
 438         struct nfsd *nfsd = nsd->nsd_nfsd;
 439         struct nfsrv_descript *nd = NULL;
 440         struct mbuf *m, *mreq;
 441         int error = 0, cacherep, sotype, writes_todo;
 442         int procrastinate;
 443         u_quad_t cur_usec;
 444
 445 #ifndef nolint
 446         cacherep = RC_DOIT;
 447         writes_todo = 0;
 448 #endif
 449         lwkt_gettoken(&nfs_token);
 450
 451         if (nfsd == NULL) {
 452                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
 453                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
 454                 nfsd->nfsd_td = td;
 455                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
 456                 nfs_numnfsd++;
 457         }
 458
 459         /*
 460          * Loop getting rpc requests until SIGKILL.
 461          */
 462         for (;;) {
 463                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
 464                         while (nfsd->nfsd_slp == NULL &&
 465                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
 466                                 nfsd->nfsd_flag |= NFSD_WAITING;
 467                                 nfsd_waiting++;
 468                                 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0);
 469                                 nfsd_waiting--;
 470                                 if (error)
 471                                         goto done;
 472                         }
 473                         if (nfsd->nfsd_slp == NULL &&
 474                             (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
 475                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
 476                                     if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
 477                                         == (SLP_VALID | SLP_DOREC)) {
 478                                             slp->ns_flag &= ~SLP_DOREC;
 479                                             nfsrv_slpref(slp);
 480                                             nfsd->nfsd_slp = slp;
 481                                             break;
 482                                     }
 483                                 }
 484                                 if (slp == 0)
 485                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
 486                         }
 487                         if ((slp = nfsd->nfsd_slp) == NULL)
 488                                 continue;
 489
 490                         lwkt_reltoken(&nfs_token);
 491                         lwkt_gettoken(&slp->ns_token);
 492
 493                         if (slp->ns_flag & SLP_VALID) {
 494                                 if (slp->ns_flag & SLP_DISCONN)
 495                                         nfsrv_zapsock(slp);
 496                                 else if (slp->ns_flag & SLP_NEEDQ) {
 497                                         slp->ns_flag &= ~SLP_NEEDQ;
 498                                         (void) nfs_slplock(slp, 1);
 499                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
 500                                                 MB_WAIT);
 501                                         nfs_slpunlock(slp);
 502                                 }
 503                                 error = nfsrv_dorec(slp, nfsd, &nd);
 504                                 cur_usec = nfs_curusec();
 505                                 if (error && slp->ns_tq.lh_first &&
 506                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
 507                                         error = 0;
 508                                         cacherep = RC_DOIT;
 509                                         writes_todo = 1;
 510                                 } else
 511                                         writes_todo = 0;
 512                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
 513                         }
 514                 } else {
 515                         error = 0;
 516                         slp = nfsd->nfsd_slp;
 517                         lwkt_reltoken(&nfs_token);
 518                         lwkt_gettoken(&slp->ns_token);
 519                 }
 520
 521                 /*
 522                  * nfs_token not held here.  slp token is held.
 523                  */
 524                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
 525                         if (nd) {
 526                                 kfree((caddr_t)nd, M_NFSRVDESC);
 527                                 nd = NULL;
 528                         }
 529                         nfsd->nfsd_slp = NULL;
 530                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 531                         lwkt_reltoken(&slp->ns_token);
 532                         lwkt_gettoken(&nfs_token);
 533                         nfsrv_slpderef(slp);
 534                         continue;
 535                 }
 536
 537                 /*
 538                  * nfs_token not held here.  slp token is held.
 539                  */
 540                 sotype = slp->ns_so->so_type;
 541                 if (nd) {
 542                     getmicrotime(&nd->nd_starttime);
 543                     if (nd->nd_nam2)
 544                         nd->nd_nam = nd->nd_nam2;
 545                     else
 546                         nd->nd_nam = slp->ns_nam;
 547
 548                     /*
 549                      * Check to see if authorization is needed.
 550                      */
 551                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
 552                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
 553                         nsd->nsd_haddr =
 554                                 ((struct sockaddr_in *)
 555                                  nd->nd_nam)->sin_addr.s_addr;
 556                         nsd->nsd_authlen = nfsd->nfsd_authlen;
 557                         nsd->nsd_verflen = nfsd->nfsd_verflen;
 558                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
 559                                 nfsd->nfsd_authlen) &&
 560                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
 561                                 nfsd->nfsd_verflen) &&
 562                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
 563                             lwkt_reltoken(&slp->ns_token);
 564                             return (ENEEDAUTH);
 565                         cacherep = RC_DROPIT;
 566                     } else {
 567                         cacherep = nfsrv_getcache(nd, slp, &mreq);
 568                     }
 569
 570                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
 571                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
 572                         nd->nd_procnum = NFSPROC_NOOP;
 573                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 574                         cacherep = RC_DOIT;
 575                     } else if (nfs_privport) {
 576                         /* Check if source port is privileged */
 577                         u_short port;
 578                         struct sockaddr *nam = nd->nd_nam;
 579                         struct sockaddr_in *sin;
 580
 581                         sin = (struct sockaddr_in *)nam;
 582                         port = ntohs(sin->sin_port);
 583                         if (port >= IPPORT_RESERVED &&
 584                             nd->nd_procnum != NFSPROC_NULL) {
 585                             nd->nd_procnum = NFSPROC_NOOP;
 586                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 587                             cacherep = RC_DOIT;
 588                             kprintf("NFS request from unprivileged port (%s:%d)\n",
 589                                    inet_ntoa(sin->sin_addr), port);
 590                         }
 591                     }
 592
 593                 }
 594
 595                 /*
 596                  * Loop to get all the write rpc replies that have been
 597                  * gathered together.
 598                  *
 599                  * nfs_token not held here.  slp token is held.
 600                  */
 601                 do {
 602                     switch (cacherep) {
 603                     case RC_DOIT:
 604                         if (nd && (nd->nd_flag & ND_NFSV3))
 605                             procrastinate = nfsrvw_procrastinate_v3;
 606                         else
 607                             procrastinate = nfsrvw_procrastinate;
 608                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
 609                             procrastinate > 0)
 610                         ) {
 611                             error = nfsrv_writegather(&nd, slp,
 612                                 nfsd->nfsd_td, &mreq);
 613                         } else {
 614                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
 615                                 slp, nfsd->nfsd_td, &mreq);
 616                         }
 617                         if (mreq == NULL)
 618                                 break;
 619                         if (error != 0 && error != NFSERR_RETVOID) {
 620                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
 621                                         nfsstats.srv_errs++;
 622                                 nfsrv_updatecache(nd, FALSE, mreq);
 623                                 if (nd->nd_nam2)
 624                                         FREE(nd->nd_nam2, M_SONAME);
 625                                 break;
 626                         }
 627                         nfsstats.srvrpccnt[nd->nd_procnum]++;
 628                         nfsrv_updatecache(nd, TRUE, mreq);
 629                         nd->nd_mrep = NULL;
 630                     case RC_REPLY:
 631                         m = mreq;
 632                         siz = 0;
 633                         while (m) {
 634                                 siz += m->m_len;
 635                                 m = m->m_next;
 636                         }
 637                         if (siz <= 0 || siz > NFS_MAXPACKET) {
 638                                 kprintf("mbuf siz=%d\n",siz);
 639                                 panic("Bad nfs svc reply");
 640                         }
 641                         m = mreq;
 642                         m->m_pkthdr.len = siz;
 643                         m->m_pkthdr.rcvif = NULL;
 644                         /*
 645                          * For stream protocols, prepend a Sun RPC
 646                          * Record Mark.
 647                          */
 648                         if (sotype == SOCK_STREAM) {
 649                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
 650                                 if (m == NULL)
 651                                         return (ENOBUFS);
 652                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
 653                         }
 654                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 655                                 (void) nfs_slplock(slp, 1);
 656                         if (slp->ns_flag & SLP_VALID)
 657                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
 658                         else {
 659                             error = EPIPE;
 660                             m_freem(m);
 661                         }
 662                         if (nfsrtton)
 663                                 nfsd_rt(sotype, nd, cacherep);
 664                         if (nd->nd_nam2)
 665                                 FREE(nd->nd_nam2, M_SONAME);
 666                         if (nd->nd_mrep)
 667                                 m_freem(nd->nd_mrep);
 668                         if (error == EPIPE)
 669                                 nfsrv_zapsock(slp);
 670                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 671                                 nfs_slpunlock(slp);
 672                         if (error == EINTR || error == ERESTART) {
 673                                 kfree((caddr_t)nd, M_NFSRVDESC);
 674                                 lwkt_reltoken(&slp->ns_token);
 675                                 lwkt_gettoken(&nfs_token);
 676                                 nfsrv_slpderef(slp);
 677                                 goto done;
 678                         }
 679                         break;
 680                     case RC_DROPIT:
 681                         if (nfsrtton)
 682                                 nfsd_rt(sotype, nd, cacherep);
 683                         m_freem(nd->nd_mrep);
 684                         if (nd->nd_nam2)
 685                                 FREE(nd->nd_nam2, M_SONAME);
 686                         break;
 687                     };
 688                     if (nd) {
 689                         FREE((caddr_t)nd, M_NFSRVDESC);
 690                         nd = NULL;
 691                     }
 692
 693                     /*
 694                      * Check to see if there are outstanding writes that
 695                      * need to be serviced.
 696                      */
 697                     cur_usec = nfs_curusec();
 698                     if (slp->ns_tq.lh_first &&
 699                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
 700                         cacherep = RC_DOIT;
 701                         writes_todo = 1;
 702                     } else {
 703                         writes_todo = 0;
 704                     }
 705                 } while (writes_todo);
 706
 707                 /*
 708                  * nfs_token not held here.  slp token is held.
 709                  */
 710                 if (nfsrv_dorec(slp, nfsd, &nd)) {
 711                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 712                         nfsd->nfsd_slp = NULL;
 713                         lwkt_reltoken(&slp->ns_token);
 714                         lwkt_gettoken(&nfs_token);
 715                         nfsrv_slpderef(slp);
 716                 } else {
 717                         lwkt_reltoken(&slp->ns_token);
 718                         lwkt_gettoken(&nfs_token);
 719                 }
 720         }
 721 done:
 722         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
 723         kfree((caddr_t)nfsd, M_NFSD);
 724         nsd->nsd_nfsd = NULL;
 725         if (--nfs_numnfsd == 0)
 726                 nfsrv_init(TRUE);       /* Reinitialize everything */
 727
 728         lwkt_reltoken(&nfs_token);
 729         return (error);
 730 }
 731
 732 /*
 733  * Shut down a socket associated with an nfssvc_sock structure.
 734  * Should be called with the send lock set, if required.
 735  * The trick here is to increment the sref at the start, so that the nfsds
 736  * will stop using it and clear ns_flag at the end so that it will not be
 737  * reassigned during cleanup.
 738  */
 739 static void
 740 nfsrv_zapsock(struct nfssvc_sock *slp)
 741 {
 742         struct nfsuid *nuidp, *nnuidp;
 743         struct nfsrv_descript *nwp, *nnwp;
 744         struct socket *so;
 745         struct file *fp;
 746         struct nfsrv_rec *rec;
 747
 748         slp->ns_flag &= ~SLP_ALLFLAGS;
 749         fp = slp->ns_fp;
 750         if (fp) {
 751                 slp->ns_fp = NULL;
 752                 so = slp->ns_so;
 753                 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
 754                 so->so_upcall = NULL;
 755                 so->so_upcallarg = NULL;
 756                 soshutdown(so, SHUT_RDWR);
 757                 closef(fp, NULL);
 758                 if (slp->ns_nam)
 759                         FREE(slp->ns_nam, M_SONAME);
 760                 m_freem(slp->ns_raw);
 761                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
 762                         --slp->ns_numrec;
 763                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
 764                         if (rec->nr_address)
 765                                 FREE(rec->nr_address, M_SONAME);
 766                         m_freem(rec->nr_packet);
 767                         kfree(rec, M_NFSRVDESC);
 768                 }
 769                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
 770                                       nnuidp) {
 771                         LIST_REMOVE(nuidp, nu_hash);
 772                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
 773                         if (nuidp->nu_flag & NU_NAM)
 774                                 FREE(nuidp->nu_nam, M_SONAME);
 775                         kfree((caddr_t)nuidp, M_NFSUID);
 776                 }
 777                 crit_enter();
 778                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
 779                         nnwp = nwp->nd_tq.le_next;
 780                         LIST_REMOVE(nwp, nd_tq);
 781                         kfree((caddr_t)nwp, M_NFSRVDESC);
 782                 }
 783                 LIST_INIT(&slp->ns_tq);
 784                 crit_exit();
 785         }
 786 }
 787
 788 /*
 789  * Derefence a server socket structure. If it has no more references and
 790  * is no longer valid, you can throw it away.
 791  *
 792  * Must be holding nfs_token!
 793  */
 794 void
 795 nfsrv_slpderef(struct nfssvc_sock *slp)
 796 {
 797         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
 798         if (--slp->ns_sref == 0 && (slp->ns_flag & SLP_VALID) == 0) {
 799                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 800                 kfree((caddr_t)slp, M_NFSSVC);
 801         }
 802 }
 803
 804 void
 805 nfsrv_slpref(struct nfssvc_sock *slp)
 806 {
 807         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
 808         ++slp->ns_sref;
 809 }
 810
 811 /*
 812  * Lock a socket against others.
 813  *
 814  * Returns 0 on failure, 1 on success.
 815  */
 816 int
 817 nfs_slplock(struct nfssvc_sock *slp, int wait)
 818 {
 819         mtx_t mtx = &slp->ns_solock;
 820
 821         if (wait) {
 822                 mtx_lock_ex(mtx, "nfsslplck", 0, 0);
 823                 return(1);
 824         } else if (mtx_lock_ex_try(mtx) == 0) {
 825                 return(1);
 826         } else {
 827                 return(0);
 828         }
 829 }
 830
 831 /*
 832  * Unlock the stream socket for others.
 833  */
 834 void
 835 nfs_slpunlock(struct nfssvc_sock *slp)
 836 {
 837         mtx_t mtx = &slp->ns_solock;
 838
 839         mtx_unlock(mtx);
 840 }
 841
 842 /*
 843  * Initialize the data structures for the server.
 844  * Handshake with any new nfsds starting up to avoid any chance of
 845  * corruption.
 846  */
 847 void
 848 nfsrv_init(int terminating)
 849 {
 850         struct nfssvc_sock *slp, *nslp;
 851
 852         lwkt_gettoken(&nfs_token);
 853         if (nfssvc_sockhead_flag & SLP_INIT)
 854                 panic("nfsd init");
 855         nfssvc_sockhead_flag |= SLP_INIT;
 856
 857         if (terminating) {
 858                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
 859                         if (slp->ns_flag & SLP_VALID)
 860                                 nfsrv_zapsock(slp);
 861                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 862                         kfree((caddr_t)slp, M_NFSSVC);
 863                 }
 864                 nfsrv_cleancache();     /* And clear out server cache */
 865         } else {
 866                 nfs_pub.np_valid = 0;
 867         }
 868
 869         TAILQ_INIT(&nfssvc_sockhead);
 870         nfssvc_sockhead_flag &= ~SLP_INIT;
 871         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
 872                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
 873                 wakeup((caddr_t)&nfssvc_sockhead);
 874         }
 875
 876         TAILQ_INIT(&nfsd_head);
 877         nfsd_head_flag &= ~NFSD_CHECKSLP;
 878
 879         lwkt_reltoken(&nfs_token);
 880
 881 #if 0
 882         nfs_udpsock = (struct nfssvc_sock *)
 883             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 884         mtx_init(&nfs_udpsock->ns_solock);
 885         STAILQ_INIT(&nfs_udpsock->ns_rec);
 886         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
 887         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
 888
 889         nfs_cltpsock = (struct nfssvc_sock *)
 890             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 891         mtx_init(&nfs_cltpsock->ns_solock);
 892         STAILQ_INIT(&nfs_cltpsock->ns_rec);
 893         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
 894         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
 895 #endif
 896 }
 897
 898 /*
 899  * Add entries to the server monitor log.
 900  */
 901 static void
 902 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
 903 {
 904         struct drt *rt;
 905
 906         rt = &nfsdrt.drt[nfsdrt.pos];
 907         if (cacherep == RC_DOIT)
 908                 rt->flag = 0;
 909         else if (cacherep == RC_REPLY)
 910                 rt->flag = DRT_CACHEREPLY;
 911         else
 912                 rt->flag = DRT_CACHEDROP;
 913         if (sotype == SOCK_STREAM)
 914                 rt->flag |= DRT_TCP;
 915         if (nd->nd_flag & ND_NFSV3)
 916                 rt->flag |= DRT_NFSV3;
 917         rt->proc = nd->nd_procnum;
 918         if (nd->nd_nam->sa_family == AF_INET)
 919             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
 920         else
 921             rt->ipadr = INADDR_ANY;
 922         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
 923         getmicrotime(&rt->tstamp);
 924         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
 925 }
 926 #endif /* NFS_NOSERVER */
 927
 928 static int nfs_defect = 0;
 929 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
 930
 931 /*
 932  * Get an authorization string for the uid by having the mount_nfs sitting
 933  * on this mount point porpous out of the kernel and do it.
 934  */
 935 int
 936 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
 937             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
 938             int *verf_len, NFSKERBKEY_T key /* return session key */)
 939 {
 940         int error = 0;
 941
 942         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
 943                 nmp->nm_state |= NFSSTA_WANTAUTH;
 944                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
 945                         "nfsauth1", 2 * hz);
 946                 error = nfs_sigintr(nmp, rep, rep->r_td);
 947                 if (error) {
 948                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
 949                         return (error);
 950                 }
 951         }
 952         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
 953         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
 954         nmp->nm_authlen = RPCAUTH_MAXSIZ;
 955         nmp->nm_verfstr = verf_str;
 956         nmp->nm_verflen = *verf_len;
 957         nmp->nm_authuid = cred->cr_uid;
 958         wakeup((caddr_t)&nmp->nm_authstr);
 959
 960         /*
 961          * And wait for mount_nfs to do its stuff.
 962          */
 963         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
 964                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
 965                         "nfsauth2", 2 * hz);
 966                 error = nfs_sigintr(nmp, rep, rep->r_td);
 967         }
 968         if (nmp->nm_state & NFSSTA_AUTHERR) {
 969                 nmp->nm_state &= ~NFSSTA_AUTHERR;
 970                 error = EAUTH;
 971         }
 972         if (error)
 973                 kfree((caddr_t)*auth_str, M_TEMP);
 974         else {
 975                 *auth_len = nmp->nm_authlen;
 976                 *verf_len = nmp->nm_verflen;
 977                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
 978         }
 979         nmp->nm_state &= ~NFSSTA_HASAUTH;
 980         nmp->nm_state |= NFSSTA_WAITAUTH;
 981         if (nmp->nm_state & NFSSTA_WANTAUTH) {
 982                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
 983                 wakeup((caddr_t)&nmp->nm_authtype);
 984         }
 985         return (error);
 986 }
 987
 988 /*
 989  * Get a nickname authenticator and verifier.
 990  */
 991 int
 992 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
 993                 int *auth_len, char *verf_str, int verf_len)
 994 {
 995         struct nfsuid *nuidp;
 996         u_int32_t *nickp, *verfp;
 997         struct timeval ktvin, ktvout;
 998
 999 #ifdef DIAGNOSTIC
1000         if (verf_len < (4 * NFSX_UNSIGNED))
1001                 panic("nfs_getnickauth verf too small");
1002 #endif
1003         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
1004             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1005                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
1006                         break;
1007         }
1008         if (!nuidp || nuidp->nu_expire < time_second)
1009                 return (EACCES);
1010
1011         /*
1012          * Move to the end of the lru list (end of lru == most recently used).
1013          */
1014         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1015         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
1016
1017         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
1018         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
1019         *nickp = txdr_unsigned(nuidp->nu_nickname);
1020         *auth_str = (char *)nickp;
1021         *auth_len = 2 * NFSX_UNSIGNED;
1022
1023         /*
1024          * Now we must encrypt the verifier and package it up.
1025          */
1026         verfp = (u_int32_t *)verf_str;
1027         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
1028         if (time_second > nuidp->nu_timestamp.tv_sec ||
1029             (time_second == nuidp->nu_timestamp.tv_sec &&
1030              time_second > nuidp->nu_timestamp.tv_usec))
1031                 getmicrotime(&nuidp->nu_timestamp);
1032         else
1033                 nuidp->nu_timestamp.tv_usec++;
1034         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
1035         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1036
1037         /*
1038          * Now encrypt the timestamp verifier in ecb mode using the session
1039          * key.
1040          */
1041 #ifdef NFSKERB
1042         XXX
1043 #else
1044         ktvout.tv_sec = 0;
1045         ktvout.tv_usec = 0;
1046 #endif
1047
1048         *verfp++ = ktvout.tv_sec;
1049         *verfp++ = ktvout.tv_usec;
1050         *verfp = 0;
1051         return (0);
1052 }
1053
1054 /*
1055  * Save the current nickname in a hash list entry on the mount point.
1056  */
1057 int
1058 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1059                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1060                  struct mbuf *mrep)
1061 {
1062         struct nfsuid *nuidp;
1063         u_int32_t *tl;
1064         struct timeval ktvin, ktvout;
1065         u_int32_t nick;
1066         int deltasec, error = 0;
1067         struct nfsm_info info;
1068
1069         info.md = *mdp;
1070         info.dpos = *dposp;
1071         info.mrep = mrep;
1072
1073         if (len == (3 * NFSX_UNSIGNED)) {
1074                 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
1075                 ktvin.tv_sec = *tl++;
1076                 ktvin.tv_usec = *tl++;
1077                 nick = fxdr_unsigned(u_int32_t, *tl);
1078
1079                 /*
1080                  * Decrypt the timestamp in ecb mode.
1081                  */
1082 #ifdef NFSKERB
1083                 XXX
1084 #else
1085                 ktvout.tv_sec = 0;
1086                 ktvout.tv_usec = 0;
1087 #endif
1088                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1089                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1090                 deltasec = time_second - ktvout.tv_sec;
1091                 if (deltasec < 0)
1092                         deltasec = -deltasec;
1093                 /*
1094                  * If ok, add it to the hash list for the mount point.
1095                  */
1096                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1097                         if (nmp->nm_numuids < nuidhash_max) {
1098                                 nmp->nm_numuids++;
1099                                 nuidp = (struct nfsuid *)
1100                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1101                                         M_WAITOK);
1102                         } else {
1103                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1104                                 LIST_REMOVE(nuidp, nu_hash);
1105                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1106                                         nu_lru);
1107                         }
1108                         nuidp->nu_flag = 0;
1109                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1110                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1111                         nuidp->nu_timestamp = ktvout;
1112                         nuidp->nu_nickname = nick;
1113                         bcopy(key, nuidp->nu_key, sizeof (key));
1114                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1115                                 nu_lru);
1116                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1117                                 nuidp, nu_hash);
1118                 }
1119         } else {
1120                 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
1121         }
1122 nfsmout:
1123         *mdp = info.md;
1124         *dposp = info.dpos;
1125         return (error);
1126 }