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