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/buf.h>
  53 #include <sys/mbuf.h>
  54 #include <sys/resourcevar.h>
  55 #include <sys/socket.h>
  56 #include <sys/socketvar.h>
  57 #include <sys/domain.h>
  58 #include <sys/protosw.h>
  59 #include <sys/nlookup.h>
  60 #include <vm/vm_zone.h>
  61
  62 #include <netinet/in.h>
  63 #include <netinet/tcp.h>
  64 #include "xdr_subs.h"
  65 #include "rpcv2.h"
  66 #include "nfsproto.h"
  67 #include "nfs.h"
  68 #include "nfsm_subs.h"
  69 #include "nfsrvcache.h"
  70 #include "nfsmount.h"
  71 #include "nfsnode.h"
  72 #include "nfsrtt.h"
  73
  74 #include <sys/thread2.h>
  75
  76 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
  77
  78 /* Global defs. */
  79 extern int32_t (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
  80                                             struct nfssvc_sock *slp,
  81                                             struct thread *td,
  82                                             struct mbuf **mreqp);
  83 extern int nfs_numasync;
  84 extern int nfsrtton;
  85 extern struct nfsstats nfsstats;
  86 extern int nfsrvw_procrastinate;
  87 extern int nfsrvw_procrastinate_v3;
  88 static int nuidhash_max = NFS_MAXUIDHASH;
  89
  90 #ifndef NFS_NOSERVER
  91 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
  92 #endif
  93 static int      nfssvc_iod (struct thread *);
  94
  95 #define TRUE    1
  96 #define FALSE   0
  97
  98 static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
  99
 100 SYSCTL_DECL(_vfs_nfs);
 101
 102 #ifndef NFS_NOSERVER
 103 int nfsd_waiting = 0;
 104 static struct nfsdrt nfsdrt;
 105 static int nfs_numnfsd = 0;
 106 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
 107                              int cacherep);
 108 static int      nfssvc_addsock (struct file *, struct sockaddr *,
 109                                     struct thread *);
 110 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
 111
 112 static int nfs_privport = 0;
 113 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
 114 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
 115 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
 116 static int      nfs_soreserve = 65535;
 117 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, "");
 118
 119 /*
 120  * NFS server system calls
 121  */
 122
 123 #endif /* NFS_NOSERVER */
 124 /*
 125  * nfssvc_args(int flag, caddr_t argp)
 126  *
 127  * Nfs server psuedo system call for the nfsd's
 128  * Based on the flag value it either:
 129  * - adds a socket to the selection list
 130  * - remains in the kernel as an nfsd
 131  * - remains in the kernel as an nfsiod
 132  */
 133 int
 134 sys_nfssvc(struct nfssvc_args *uap)
 135 {
 136 #ifndef NFS_NOSERVER
 137         struct nlookupdata nd;
 138         struct file *fp;
 139         struct sockaddr *nam;
 140         struct nfsd_args nfsdarg;
 141         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
 142         struct nfsd_cargs ncd;
 143         struct nfsd *nfsd;
 144         struct nfssvc_sock *slp;
 145         struct nfsuid *nuidp;
 146         struct nfsmount *nmp;
 147         struct vnode *vp;
 148 #endif /* NFS_NOSERVER */
 149         int error;
 150         struct thread *td = curthread;
 151
 152         /*
 153          * Must be super user
 154          */
 155         error = suser(td);
 156         if(error)
 157                 return (error);
 158         KKASSERT(td->td_proc);  /* for ucred and p_fd */
 159         while (nfssvc_sockhead_flag & SLP_INIT) {
 160                  nfssvc_sockhead_flag |= SLP_WANTINIT;
 161                 (void) tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
 162         }
 163         if (uap->flag & NFSSVC_BIOD)
 164                 error = nfssvc_iod(td);
 165 #ifdef NFS_NOSERVER
 166         else
 167                 error = ENXIO;
 168 #else /* !NFS_NOSERVER */
 169         else if (uap->flag & NFSSVC_MNTD) {
 170                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
 171                 if (error)
 172                         return (error);
 173                 vp = NULL;
 174                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE,
 175                                         NLC_FOLLOW);
 176                 if (error == 0)
 177                         error = nlookup(&nd);
 178                 if (error == 0)
 179                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
 180                 nlookup_done(&nd);
 181                 if (error)
 182                         return (error);
 183
 184                 if ((vp->v_flag & VROOT) == 0)
 185                         error = EINVAL;
 186                 nmp = VFSTONFS(vp->v_mount);
 187                 vput(vp);
 188                 if (error)
 189                         return (error);
 190                 if ((nmp->nm_state & NFSSTA_MNTD) &&
 191                         (uap->flag & NFSSVC_GOTAUTH) == 0)
 192                         return (0);
 193                 nmp->nm_state |= NFSSTA_MNTD;
 194                 error = nfs_clientd(nmp, td->td_proc->p_ucred, &ncd, uap->flag,
 195                                     uap->argp, td);
 196         } else if (uap->flag & NFSSVC_ADDSOCK) {
 197                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
 198                 if (error)
 199                         return (error);
 200                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
 201                 if (error)
 202                         return (error);
 203                 /*
 204                  * Get the client address for connected sockets.
 205                  */
 206                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
 207                         nam = (struct sockaddr *)0;
 208                 else {
 209                         error = getsockaddr(&nam, nfsdarg.name,
 210                                             nfsdarg.namelen);
 211                         if (error) {
 212                                 fdrop(fp);
 213                                 return (error);
 214                         }
 215                 }
 216                 error = nfssvc_addsock(fp, nam, td);
 217                 fdrop(fp);
 218         } else {
 219                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
 220                 if (error)
 221                         return (error);
 222                 if ((uap->flag & NFSSVC_AUTHIN) &&
 223                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
 224                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
 225                         slp = nfsd->nfsd_slp;
 226
 227                         /*
 228                          * First check to see if another nfsd has already
 229                          * added this credential.
 230                          */
 231                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
 232                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
 233                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
 234                                     (!nfsd->nfsd_nd->nd_nam2 ||
 235                                      netaddr_match(NU_NETFAM(nuidp),
 236                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
 237                                         break;
 238                         }
 239                         if (nuidp) {
 240                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
 241                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 242                         } else {
 243                             /*
 244                              * Nope, so we will.
 245                              */
 246                             if (slp->ns_numuids < nuidhash_max) {
 247                                 slp->ns_numuids++;
 248                                 nuidp = (struct nfsuid *)
 249                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
 250                                         M_WAITOK);
 251                             } else
 252                                 nuidp = (struct nfsuid *)0;
 253                             if ((slp->ns_flag & SLP_VALID) == 0) {
 254                                 if (nuidp)
 255                                     kfree((caddr_t)nuidp, M_NFSUID);
 256                             } else {
 257                                 if (nuidp == (struct nfsuid *)0) {
 258                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
 259                                     LIST_REMOVE(nuidp, nu_hash);
 260                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
 261                                         nu_lru);
 262                                     if (nuidp->nu_flag & NU_NAM)
 263                                         FREE(nuidp->nu_nam, M_SONAME);
 264                                 }
 265                                 nuidp->nu_flag = 0;
 266                                 nuidp->nu_cr = nsd->nsd_cr;
 267                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
 268                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
 269                                 nuidp->nu_cr.cr_ref = 1;
 270                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
 271                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
 272                                 /*
 273                                  * and save the session key in nu_key.
 274                                  */
 275                                 bcopy(nsd->nsd_key, nuidp->nu_key,
 276                                     sizeof (nsd->nsd_key));
 277                                 if (nfsd->nfsd_nd->nd_nam2) {
 278                                     struct sockaddr_in *saddr;
 279
 280                                     saddr = (struct sockaddr_in *)
 281                                             nfsd->nfsd_nd->nd_nam2;
 282                                     switch (saddr->sin_family) {
 283                                     case AF_INET:
 284                                         nuidp->nu_flag |= NU_INETADDR;
 285                                         nuidp->nu_inetaddr =
 286                                              saddr->sin_addr.s_addr;
 287                                         break;
 288                                     case AF_ISO:
 289                                     default:
 290                                         nuidp->nu_flag |= NU_NAM;
 291                                         nuidp->nu_nam =
 292                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
 293                                         break;
 294                                     };
 295                                 }
 296                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
 297                                         nu_lru);
 298                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
 299                                         nuidp, nu_hash);
 300                                 nfsrv_setcred(&nuidp->nu_cr,
 301                                     &nfsd->nfsd_nd->nd_cr);
 302                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 303                             }
 304                         }
 305                 }
 306                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
 307                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
 308                 error = nfssvc_nfsd(nsd, uap->argp, td);
 309         }
 310 #endif /* NFS_NOSERVER */
 311         if (error == EINTR || error == ERESTART)
 312                 error = 0;
 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 = (struct nfssvc_sock *)0;
 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         if (so->so_type == SOCK_STREAM)
 349                 siz = NFS_MAXPACKET + sizeof (u_long);
 350         else
 351                 siz = NFS_MAXPACKET;
 352         if (siz < nfs_soreserve)
 353             siz = nfs_soreserve;
 354         if (siz > sb_max_adj) {
 355             kprintf("Warning: vfs.nfs.soreserve (%d) "
 356                 "limited to adjusted sb_max (%ld)\n",
 357                 nfs_soreserve, sb_max_adj);
 358             siz = sb_max_adj;
 359         }
 360
 361         error = soreserve(so, siz, siz, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
 362         if (error) {
 363                 if (mynam != NULL)
 364                         FREE(mynam, M_SONAME);
 365                 return (error);
 366         }
 367
 368         /*
 369          * Set protocol specific options { for now TCP only } and
 370          * reserve some space. For datagram sockets, this can get called
 371          * repeatedly for the same socket, but that isn't harmful.
 372          */
 373         if (so->so_type == SOCK_STREAM) {
 374                 struct sockopt sopt;
 375                 int val;
 376
 377                 bzero(&sopt, sizeof sopt);
 378                 sopt.sopt_level = SOL_SOCKET;
 379                 sopt.sopt_name = SO_KEEPALIVE;
 380                 sopt.sopt_val = &val;
 381                 sopt.sopt_valsize = sizeof val;
 382                 val = 1;
 383                 sosetopt(so, &sopt);
 384         }
 385         if (so->so_proto->pr_domain->dom_family == AF_INET &&
 386             so->so_proto->pr_protocol == IPPROTO_TCP) {
 387                 struct sockopt sopt;
 388                 int val;
 389
 390                 bzero(&sopt, sizeof sopt);
 391                 sopt.sopt_level = IPPROTO_TCP;
 392                 sopt.sopt_name = TCP_NODELAY;
 393                 sopt.sopt_val = &val;
 394                 sopt.sopt_valsize = sizeof val;
 395                 val = 1;
 396                 sosetopt(so, &sopt);
 397         }
 398         so->so_rcv.ssb_flags &= ~SSB_NOINTR;
 399         so->so_rcv.ssb_timeo = 0;
 400         so->so_snd.ssb_flags &= ~SSB_NOINTR;
 401         so->so_snd.ssb_timeo = 0;
 402
 403         slp = (struct nfssvc_sock *)kmalloc(sizeof (struct nfssvc_sock),
 404             M_NFSSVC, M_WAITOK | M_ZERO);
 405         STAILQ_INIT(&slp->ns_rec);
 406         TAILQ_INIT(&slp->ns_uidlruhead);
 407         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
 408
 409         slp->ns_so = so;
 410         slp->ns_nam = mynam;
 411         fp->f_count++;
 412         slp->ns_fp = fp;
 413         crit_enter();
 414         so->so_upcallarg = (caddr_t)slp;
 415         so->so_upcall = nfsrv_rcv;
 416         so->so_rcv.ssb_flags |= SSB_UPCALL;
 417         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
 418         nfsrv_wakenfsd(slp, 1);
 419         crit_exit();
 420         return (0);
 421 }
 422
 423 /*
 424  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 425  * until it is killed by a signal.
 426  */
 427 static int
 428 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
 429 {
 430         int siz;
 431         struct nfssvc_sock *slp;
 432         struct nfsd *nfsd = nsd->nsd_nfsd;
 433         struct nfsrv_descript *nd = NULL;
 434         struct mbuf *m, *mreq;
 435         int error = 0, cacherep, sotype, writes_todo;
 436         int procrastinate;
 437         u_quad_t cur_usec;
 438
 439 #ifndef nolint
 440         cacherep = RC_DOIT;
 441         writes_todo = 0;
 442 #endif
 443         if (nfsd == (struct nfsd *)0) {
 444                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
 445                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
 446                 crit_enter();
 447                 nfsd->nfsd_td = td;
 448                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
 449                 nfs_numnfsd++;
 450         } else
 451                 crit_enter();
 452
 453         /*
 454          * Loop getting rpc requests until SIGKILL.
 455          */
 456         for (;;) {
 457                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
 458                         while (nfsd->nfsd_slp == NULL &&
 459                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
 460                                 nfsd->nfsd_flag |= NFSD_WAITING;
 461                                 nfsd_waiting++;
 462                                 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0);
 463                                 nfsd_waiting--;
 464                                 if (error)
 465                                         goto done;
 466                         }
 467                         if (nfsd->nfsd_slp == NULL &&
 468                             (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
 469                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
 470                                     if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
 471                                         == (SLP_VALID | SLP_DOREC)) {
 472                                             slp->ns_flag &= ~SLP_DOREC;
 473                                             slp->ns_sref++;
 474                                             nfsd->nfsd_slp = slp;
 475                                             break;
 476                                     }
 477                                 }
 478                                 if (slp == 0)
 479                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
 480                         }
 481                         if ((slp = nfsd->nfsd_slp) == (struct nfssvc_sock *)0)
 482                                 continue;
 483                         if (slp->ns_flag & SLP_VALID) {
 484                                 if (slp->ns_flag & SLP_DISCONN)
 485                                         nfsrv_zapsock(slp);
 486                                 else if (slp->ns_flag & SLP_NEEDQ) {
 487                                         slp->ns_flag &= ~SLP_NEEDQ;
 488                                         (void) nfs_slplock(slp, 1);
 489                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
 490                                                 MB_WAIT);
 491                                         nfs_slpunlock(slp);
 492                                 }
 493                                 error = nfsrv_dorec(slp, nfsd, &nd);
 494                                 cur_usec = nfs_curusec();
 495                                 if (error && slp->ns_tq.lh_first &&
 496                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
 497                                         error = 0;
 498                                         cacherep = RC_DOIT;
 499                                         writes_todo = 1;
 500                                 } else
 501                                         writes_todo = 0;
 502                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
 503                         }
 504                 } else {
 505                         error = 0;
 506                         slp = nfsd->nfsd_slp;
 507                 }
 508                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
 509                         if (nd) {
 510                                 kfree((caddr_t)nd, M_NFSRVDESC);
 511                                 nd = NULL;
 512                         }
 513                         nfsd->nfsd_slp = (struct nfssvc_sock *)0;
 514                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 515                         nfsrv_slpderef(slp);
 516                         continue;
 517                 }
 518                 crit_exit();
 519                 sotype = slp->ns_so->so_type;
 520                 if (nd) {
 521                     getmicrotime(&nd->nd_starttime);
 522                     if (nd->nd_nam2)
 523                         nd->nd_nam = nd->nd_nam2;
 524                     else
 525                         nd->nd_nam = slp->ns_nam;
 526
 527                     /*
 528                      * Check to see if authorization is needed.
 529                      */
 530                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
 531                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
 532                         nsd->nsd_haddr =
 533                                 ((struct sockaddr_in *)
 534                                  nd->nd_nam)->sin_addr.s_addr;
 535                         nsd->nsd_authlen = nfsd->nfsd_authlen;
 536                         nsd->nsd_verflen = nfsd->nfsd_verflen;
 537                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
 538                                 nfsd->nfsd_authlen) &&
 539                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
 540                                 nfsd->nfsd_verflen) &&
 541                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
 542                             return (ENEEDAUTH);
 543                         cacherep = RC_DROPIT;
 544                     } else {
 545                         cacherep = nfsrv_getcache(nd, slp, &mreq);
 546                     }
 547
 548                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
 549                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
 550                         nd->nd_procnum = NFSPROC_NOOP;
 551                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 552                         cacherep = RC_DOIT;
 553                     } else if (nfs_privport) {
 554                         /* Check if source port is privileged */
 555                         u_short port;
 556                         struct sockaddr *nam = nd->nd_nam;
 557                         struct sockaddr_in *sin;
 558
 559                         sin = (struct sockaddr_in *)nam;
 560                         port = ntohs(sin->sin_port);
 561                         if (port >= IPPORT_RESERVED &&
 562                             nd->nd_procnum != NFSPROC_NULL) {
 563                             nd->nd_procnum = NFSPROC_NOOP;
 564                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 565                             cacherep = RC_DOIT;
 566                             kprintf("NFS request from unprivileged port (%s:%d)\n",
 567                                    inet_ntoa(sin->sin_addr), port);
 568                         }
 569                     }
 570
 571                 }
 572
 573                 /*
 574                  * Loop to get all the write rpc relies that have been
 575                  * gathered together.
 576                  */
 577                 do {
 578                     switch (cacherep) {
 579                     case RC_DOIT:
 580                         if (nd && (nd->nd_flag & ND_NFSV3))
 581                             procrastinate = nfsrvw_procrastinate_v3;
 582                         else
 583                             procrastinate = nfsrvw_procrastinate;
 584                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
 585                             procrastinate > 0)
 586                         ) {
 587                             error = nfsrv_writegather(&nd, slp,
 588                                 nfsd->nfsd_td, &mreq);
 589                         } else {
 590                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
 591                                 slp, nfsd->nfsd_td, &mreq);
 592                         }
 593                         if (mreq == NULL)
 594                                 break;
 595                         if (error != 0 && error != NFSERR_RETVOID) {
 596                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
 597                                         nfsstats.srv_errs++;
 598                                 nfsrv_updatecache(nd, FALSE, mreq);
 599                                 if (nd->nd_nam2)
 600                                         FREE(nd->nd_nam2, M_SONAME);
 601                                 break;
 602                         }
 603                         nfsstats.srvrpccnt[nd->nd_procnum]++;
 604                         nfsrv_updatecache(nd, TRUE, mreq);
 605                         nd->nd_mrep = (struct mbuf *)0;
 606                     case RC_REPLY:
 607                         m = mreq;
 608                         siz = 0;
 609                         while (m) {
 610                                 siz += m->m_len;
 611                                 m = m->m_next;
 612                         }
 613                         if (siz <= 0 || siz > NFS_MAXPACKET) {
 614                                 kprintf("mbuf siz=%d\n",siz);
 615                                 panic("Bad nfs svc reply");
 616                         }
 617                         m = mreq;
 618                         m->m_pkthdr.len = siz;
 619                         m->m_pkthdr.rcvif = (struct ifnet *)0;
 620                         /*
 621                          * For stream protocols, prepend a Sun RPC
 622                          * Record Mark.
 623                          */
 624                         if (sotype == SOCK_STREAM) {
 625                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
 626                                 if (m == NULL)
 627                                         return (ENOBUFS);
 628                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
 629                         }
 630                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 631                                 (void) nfs_slplock(slp, 1);
 632                         if (slp->ns_flag & SLP_VALID)
 633                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
 634                         else {
 635                             error = EPIPE;
 636                             m_freem(m);
 637                         }
 638                         if (nfsrtton)
 639                                 nfsd_rt(sotype, nd, cacherep);
 640                         if (nd->nd_nam2)
 641                                 FREE(nd->nd_nam2, M_SONAME);
 642                         if (nd->nd_mrep)
 643                                 m_freem(nd->nd_mrep);
 644                         if (error == EPIPE)
 645                                 nfsrv_zapsock(slp);
 646                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 647                                 nfs_slpunlock(slp);
 648                         if (error == EINTR || error == ERESTART) {
 649                                 kfree((caddr_t)nd, M_NFSRVDESC);
 650                                 nfsrv_slpderef(slp);
 651                                 crit_enter();
 652                                 goto done;
 653                         }
 654                         break;
 655                     case RC_DROPIT:
 656                         if (nfsrtton)
 657                                 nfsd_rt(sotype, nd, cacherep);
 658                         m_freem(nd->nd_mrep);
 659                         if (nd->nd_nam2)
 660                                 FREE(nd->nd_nam2, M_SONAME);
 661                         break;
 662                     };
 663                     if (nd) {
 664                         FREE((caddr_t)nd, M_NFSRVDESC);
 665                         nd = NULL;
 666                     }
 667
 668                     /*
 669                      * Check to see if there are outstanding writes that
 670                      * need to be serviced.
 671                      */
 672                     cur_usec = nfs_curusec();
 673                     crit_enter();
 674                     if (slp->ns_tq.lh_first &&
 675                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
 676                         cacherep = RC_DOIT;
 677                         writes_todo = 1;
 678                     } else
 679                         writes_todo = 0;
 680                     crit_exit();
 681                 } while (writes_todo);
 682                 crit_enter();
 683                 if (nfsrv_dorec(slp, nfsd, &nd)) {
 684                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 685                         nfsd->nfsd_slp = NULL;
 686                         nfsrv_slpderef(slp);
 687                 }
 688         }
 689 done:
 690         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
 691         crit_exit();
 692         kfree((caddr_t)nfsd, M_NFSD);
 693         nsd->nsd_nfsd = (struct nfsd *)0;
 694         if (--nfs_numnfsd == 0)
 695                 nfsrv_init(TRUE);       /* Reinitialize everything */
 696         return (error);
 697 }
 698
 699 /*
 700  * Shut down a socket associated with an nfssvc_sock structure.
 701  * Should be called with the send lock set, if required.
 702  * The trick here is to increment the sref at the start, so that the nfsds
 703  * will stop using it and clear ns_flag at the end so that it will not be
 704  * reassigned during cleanup.
 705  */
 706 static void
 707 nfsrv_zapsock(struct nfssvc_sock *slp)
 708 {
 709         struct nfsuid *nuidp, *nnuidp;
 710         struct nfsrv_descript *nwp, *nnwp;
 711         struct socket *so;
 712         struct file *fp;
 713         struct nfsrv_rec *rec;
 714
 715         slp->ns_flag &= ~SLP_ALLFLAGS;
 716         fp = slp->ns_fp;
 717         if (fp) {
 718                 slp->ns_fp = (struct file *)0;
 719                 so = slp->ns_so;
 720                 so->so_rcv.ssb_flags &= ~SSB_UPCALL;
 721                 so->so_upcall = NULL;
 722                 so->so_upcallarg = NULL;
 723                 soshutdown(so, SHUT_RDWR);
 724                 closef(fp, NULL);
 725                 if (slp->ns_nam)
 726                         FREE(slp->ns_nam, M_SONAME);
 727                 m_freem(slp->ns_raw);
 728                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
 729                         --slp->ns_numrec;
 730                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
 731                         if (rec->nr_address)
 732                                 FREE(rec->nr_address, M_SONAME);
 733                         m_freem(rec->nr_packet);
 734                         kfree(rec, M_NFSRVDESC);
 735                 }
 736                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
 737                                       nnuidp) {
 738                         LIST_REMOVE(nuidp, nu_hash);
 739                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
 740                         if (nuidp->nu_flag & NU_NAM)
 741                                 FREE(nuidp->nu_nam, M_SONAME);
 742                         kfree((caddr_t)nuidp, M_NFSUID);
 743                 }
 744                 crit_enter();
 745                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
 746                         nnwp = nwp->nd_tq.le_next;
 747                         LIST_REMOVE(nwp, nd_tq);
 748                         kfree((caddr_t)nwp, M_NFSRVDESC);
 749                 }
 750                 LIST_INIT(&slp->ns_tq);
 751                 crit_exit();
 752         }
 753 }
 754
 755 /*
 756  * Derefence a server socket structure. If it has no more references and
 757  * is no longer valid, you can throw it away.
 758  */
 759 void
 760 nfsrv_slpderef(struct nfssvc_sock *slp)
 761 {
 762         if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
 763                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 764                 kfree((caddr_t)slp, M_NFSSVC);
 765         }
 766 }
 767
 768 /*
 769  * Lock a socket against others.
 770  */
 771 int
 772 nfs_slplock(struct nfssvc_sock *slp, int wait)
 773 {
 774         int *statep = &slp->ns_solock;
 775
 776         if (!wait && (*statep & NFSSTA_SNDLOCK))
 777                 return(0);      /* already locked, fail */
 778         while (*statep & NFSSTA_SNDLOCK) {
 779                 *statep |= NFSSTA_WANTSND;
 780                 (void) tsleep((caddr_t)statep, 0, "nfsslplck", 0);
 781         }
 782         *statep |= NFSSTA_SNDLOCK;
 783         return (1);
 784 }
 785
 786 /*
 787  * Unlock the stream socket for others.
 788  */
 789 void
 790 nfs_slpunlock(struct nfssvc_sock *slp)
 791 {
 792         int *statep = &slp->ns_solock;
 793
 794         if ((*statep & NFSSTA_SNDLOCK) == 0)
 795                 panic("nfs slpunlock");
 796         *statep &= ~NFSSTA_SNDLOCK;
 797         if (*statep & NFSSTA_WANTSND) {
 798                 *statep &= ~NFSSTA_WANTSND;
 799                 wakeup((caddr_t)statep);
 800         }
 801 }
 802
 803 /*
 804  * Initialize the data structures for the server.
 805  * Handshake with any new nfsds starting up to avoid any chance of
 806  * corruption.
 807  */
 808 void
 809 nfsrv_init(int terminating)
 810 {
 811         struct nfssvc_sock *slp, *nslp;
 812
 813         if (nfssvc_sockhead_flag & SLP_INIT)
 814                 panic("nfsd init");
 815         nfssvc_sockhead_flag |= SLP_INIT;
 816         if (terminating) {
 817                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
 818                         if (slp->ns_flag & SLP_VALID)
 819                                 nfsrv_zapsock(slp);
 820                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 821                         kfree((caddr_t)slp, M_NFSSVC);
 822                 }
 823                 nfsrv_cleancache();     /* And clear out server cache */
 824         } else
 825                 nfs_pub.np_valid = 0;
 826
 827         TAILQ_INIT(&nfssvc_sockhead);
 828         nfssvc_sockhead_flag &= ~SLP_INIT;
 829         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
 830                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
 831                 wakeup((caddr_t)&nfssvc_sockhead);
 832         }
 833
 834         TAILQ_INIT(&nfsd_head);
 835         nfsd_head_flag &= ~NFSD_CHECKSLP;
 836
 837 #if 0
 838         nfs_udpsock = (struct nfssvc_sock *)
 839             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 840         STAILQ_INIT(&nfs_udpsock->ns_rec);
 841         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
 842         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
 843
 844         nfs_cltpsock = (struct nfssvc_sock *)
 845             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 846         STAILQ_INIT(&nfs_cltpsock->ns_rec);
 847         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
 848         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
 849 #endif
 850 }
 851
 852 /*
 853  * Add entries to the server monitor log.
 854  */
 855 static void
 856 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
 857 {
 858         struct drt *rt;
 859
 860         rt = &nfsdrt.drt[nfsdrt.pos];
 861         if (cacherep == RC_DOIT)
 862                 rt->flag = 0;
 863         else if (cacherep == RC_REPLY)
 864                 rt->flag = DRT_CACHEREPLY;
 865         else
 866                 rt->flag = DRT_CACHEDROP;
 867         if (sotype == SOCK_STREAM)
 868                 rt->flag |= DRT_TCP;
 869         if (nd->nd_flag & ND_NFSV3)
 870                 rt->flag |= DRT_NFSV3;
 871         rt->proc = nd->nd_procnum;
 872         if (nd->nd_nam->sa_family == AF_INET)
 873             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
 874         else
 875             rt->ipadr = INADDR_ANY;
 876         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
 877         getmicrotime(&rt->tstamp);
 878         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
 879 }
 880 #endif /* NFS_NOSERVER */
 881
 882 static int nfs_defect = 0;
 883 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
 884
 885 /*
 886  * Asynchronous I/O daemons for client nfs.
 887  * They do read-ahead and write-behind operations on the block I/O cache.
 888  * Never returns unless it fails or gets killed.
 889  */
 890 static int
 891 nfssvc_iod(struct thread *td)
 892 {
 893         struct bio *bio;
 894         int i, myiod;
 895         struct nfsmount *nmp;
 896         int error = 0;
 897
 898         /*
 899          * Assign my position or return error if too many already running
 900          */
 901         myiod = -1;
 902         for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
 903                 if (nfs_asyncdaemon[i] == 0) {
 904                         nfs_asyncdaemon[i]++;
 905                         myiod = i;
 906                         break;
 907                 }
 908         if (myiod == -1)
 909                 return (EBUSY);
 910         nfs_numasync++;
 911         /*
 912          * Just loop around doin our stuff until SIGKILL
 913          */
 914         for (;;) {
 915             while (((nmp = nfs_iodmount[myiod]) == NULL
 916                      || TAILQ_EMPTY(&nmp->nm_bioq))
 917                    && error == 0) {
 918                 if (nmp)
 919                     nmp->nm_bioqiods--;
 920                 nfs_iodwant[myiod] = td;
 921                 nfs_iodmount[myiod] = NULL;
 922                 error = tsleep((caddr_t)&nfs_iodwant[myiod],
 923                         PCATCH, "nfsidl", 0);
 924             }
 925             if (error) {
 926                 nfs_asyncdaemon[myiod] = 0;
 927                 if (nmp)
 928                     nmp->nm_bioqiods--;
 929                 nfs_iodwant[myiod] = NULL;
 930                 nfs_iodmount[myiod] = NULL;
 931                 nfs_numasync--;
 932                 return (error);
 933             }
 934             while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) {
 935                 /*
 936                  * Take one off the front of the list.   The BIO's
 937                  * block number is normalized for DEV_BSIZE.
 938                  */
 939                 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
 940                 nmp->nm_bioqlen--;
 941                 if (nmp->nm_bioqwant && nmp->nm_bioqlen <= nfs_numasync) {
 942                     nmp->nm_bioqwant = FALSE;
 943                     wakeup(&nmp->nm_bioq);
 944                 }
 945                 nfs_doio((struct vnode *)bio->bio_driver_info, bio, NULL);
 946                 /*
 947                  * If there are more than one iod on this mount, then defect
 948                  * so that the iods can be shared out fairly between the mounts
 949                  */
 950                 if (nfs_defect && nmp->nm_bioqiods > 1) {
 951                     NFS_DPF(ASYNCIO,
 952                             ("nfssvc_iod: iod %d defecting from mount %p\n",
 953                              myiod, nmp));
 954                     nfs_iodmount[myiod] = NULL;
 955                     nmp->nm_bioqiods--;
 956                     break;
 957                 }
 958             }
 959         }
 960 }
 961
 962
 963 /*
 964  * Get an authorization string for the uid by having the mount_nfs sitting
 965  * on this mount point porpous out of the kernel and do it.
 966  */
 967 int
 968 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
 969             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
 970             int *verf_len, NFSKERBKEY_T key /* return session key */)
 971 {
 972         int error = 0;
 973
 974         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
 975                 nmp->nm_state |= NFSSTA_WANTAUTH;
 976                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
 977                         "nfsauth1", 2 * hz);
 978                 error = nfs_sigintr(nmp, rep, rep->r_td);
 979                 if (error) {
 980                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
 981                         return (error);
 982                 }
 983         }
 984         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
 985         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
 986         nmp->nm_authlen = RPCAUTH_MAXSIZ;
 987         nmp->nm_verfstr = verf_str;
 988         nmp->nm_verflen = *verf_len;
 989         nmp->nm_authuid = cred->cr_uid;
 990         wakeup((caddr_t)&nmp->nm_authstr);
 991
 992         /*
 993          * And wait for mount_nfs to do its stuff.
 994          */
 995         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
 996                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
 997                         "nfsauth2", 2 * hz);
 998                 error = nfs_sigintr(nmp, rep, rep->r_td);
 999         }
1000         if (nmp->nm_state & NFSSTA_AUTHERR) {
1001                 nmp->nm_state &= ~NFSSTA_AUTHERR;
1002                 error = EAUTH;
1003         }
1004         if (error)
1005                 kfree((caddr_t)*auth_str, M_TEMP);
1006         else {
1007                 *auth_len = nmp->nm_authlen;
1008                 *verf_len = nmp->nm_verflen;
1009                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
1010         }
1011         nmp->nm_state &= ~NFSSTA_HASAUTH;
1012         nmp->nm_state |= NFSSTA_WAITAUTH;
1013         if (nmp->nm_state & NFSSTA_WANTAUTH) {
1014                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
1015                 wakeup((caddr_t)&nmp->nm_authtype);
1016         }
1017         return (error);
1018 }
1019
1020 /*
1021  * Get a nickname authenticator and verifier.
1022  */
1023 int
1024 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
1025                 int *auth_len, char *verf_str, int verf_len)
1026 {
1027         struct nfsuid *nuidp;
1028         u_int32_t *nickp, *verfp;
1029         struct timeval ktvin, ktvout;
1030
1031 #ifdef DIAGNOSTIC
1032         if (verf_len < (4 * NFSX_UNSIGNED))
1033                 panic("nfs_getnickauth verf too small");
1034 #endif
1035         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
1036             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1037                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
1038                         break;
1039         }
1040         if (!nuidp || nuidp->nu_expire < time_second)
1041                 return (EACCES);
1042
1043         /*
1044          * Move to the end of the lru list (end of lru == most recently used).
1045          */
1046         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1047         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
1048
1049         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
1050         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
1051         *nickp = txdr_unsigned(nuidp->nu_nickname);
1052         *auth_str = (char *)nickp;
1053         *auth_len = 2 * NFSX_UNSIGNED;
1054
1055         /*
1056          * Now we must encrypt the verifier and package it up.
1057          */
1058         verfp = (u_int32_t *)verf_str;
1059         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
1060         if (time_second > nuidp->nu_timestamp.tv_sec ||
1061             (time_second == nuidp->nu_timestamp.tv_sec &&
1062              time_second > nuidp->nu_timestamp.tv_usec))
1063                 getmicrotime(&nuidp->nu_timestamp);
1064         else
1065                 nuidp->nu_timestamp.tv_usec++;
1066         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
1067         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1068
1069         /*
1070          * Now encrypt the timestamp verifier in ecb mode using the session
1071          * key.
1072          */
1073 #ifdef NFSKERB
1074         XXX
1075 #endif
1076
1077         *verfp++ = ktvout.tv_sec;
1078         *verfp++ = ktvout.tv_usec;
1079         *verfp = 0;
1080         return (0);
1081 }
1082
1083 /*
1084  * Save the current nickname in a hash list entry on the mount point.
1085  */
1086 int
1087 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1088                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1089                  struct mbuf *mrep)
1090 {
1091         struct nfsuid *nuidp;
1092         u_int32_t *tl;
1093         int32_t t1;
1094         struct mbuf *md = *mdp;
1095         struct timeval ktvin, ktvout;
1096         u_int32_t nick;
1097         char *dpos = *dposp, *cp2;
1098         int deltasec, error = 0;
1099
1100         if (len == (3 * NFSX_UNSIGNED)) {
1101                 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1102                 ktvin.tv_sec = *tl++;
1103                 ktvin.tv_usec = *tl++;
1104                 nick = fxdr_unsigned(u_int32_t, *tl);
1105
1106                 /*
1107                  * Decrypt the timestamp in ecb mode.
1108                  */
1109 #ifdef NFSKERB
1110                 XXX
1111 #endif
1112                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1113                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1114                 deltasec = time_second - ktvout.tv_sec;
1115                 if (deltasec < 0)
1116                         deltasec = -deltasec;
1117                 /*
1118                  * If ok, add it to the hash list for the mount point.
1119                  */
1120                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1121                         if (nmp->nm_numuids < nuidhash_max) {
1122                                 nmp->nm_numuids++;
1123                                 nuidp = (struct nfsuid *)
1124                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1125                                         M_WAITOK);
1126                         } else {
1127                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1128                                 LIST_REMOVE(nuidp, nu_hash);
1129                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1130                                         nu_lru);
1131                         }
1132                         nuidp->nu_flag = 0;
1133                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1134                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1135                         nuidp->nu_timestamp = ktvout;
1136                         nuidp->nu_nickname = nick;
1137                         bcopy(key, nuidp->nu_key, sizeof (key));
1138                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1139                                 nu_lru);
1140                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1141                                 nuidp, nu_hash);
1142                 }
1143         } else
1144                 nfsm_adv(nfsm_rndup(len));
1145 nfsmout:
1146         *mdp = md;
1147         *dposp = dpos;
1148         return (error);
1149 }