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. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
  33  * $FreeBSD: src/sys/nfs/nfs_syscalls.c,v 1.58.2.1 2000/11/26 02:30:06 dillon Exp $
  34  */
  35
  36 #include <sys/param.h>
  37 #include <sys/systm.h>
  38 #include <sys/sysproto.h>
  39 #include <sys/kernel.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/file.h>
  42 #include <sys/filedesc.h>
  43 #include <sys/vnode.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mount.h>
  46 #include <sys/proc.h>
  47 #include <sys/priv.h>
  48 #include <sys/buf.h>
  49 #include <sys/mbuf.h>
  50 #include <sys/resourcevar.h>
  51 #include <sys/socket.h>
  52 #include <sys/socketvar.h>
  53 #include <sys/domain.h>
  54 #include <sys/protosw.h>
  55 #include <sys/nlookup.h>
  56
  57 #include <sys/mutex2.h>
  58 #include <sys/thread2.h>
  59
  60 #include <netinet/in.h>
  61 #include <netinet/tcp.h>
  62 #include "xdr_subs.h"
  63 #include "rpcv2.h"
  64 #include "nfsproto.h"
  65 #include "nfs.h"
  66 #include "nfsm_subs.h"
  67 #include "nfsrvcache.h"
  68 #include "nfsmount.h"
  69 #include "nfsnode.h"
  70 #include "nfsrtt.h"
  71
  72 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
  73
  74 static int nuidhash_max = NFS_MAXUIDHASH;
  75
  76 #ifndef NFS_NOSERVER
  77 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
  78 #endif
  79
  80 #define TRUE    1
  81 #define FALSE   0
  82
  83 SYSCTL_DECL(_vfs_nfs);
  84
  85 #ifndef NFS_NOSERVER
  86 int nfsd_waiting = 0;
  87 static struct nfsdrt nfsdrt;
  88 static int nfs_numnfsd = 0;
  89 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
  90                              int cacherep);
  91 static int      nfssvc_addsock (struct file *, struct sockaddr *,
  92                                     struct thread *);
  93 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
  94
  95 static int nfs_privport = 0;
  96 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport,
  97     0, "Enable privileged source port checks");
  98 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0,
  99     "Enable NFS request procrastination");
 100 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0,
 101     "Enable NFSv3 request procrastination");
 102 int     nfs_soreserve = NFS_MAXPACKET * NFS_MAXASYNCBIO;
 103 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0,
 104     "Minimum NFS socket buffer size reservation");
 105
 106 /*
 107  * NFS server system calls
 108  */
 109
 110 #endif /* NFS_NOSERVER */
 111 /*
 112  * nfssvc_args(int flag, caddr_t argp)
 113  *
 114  * Nfs server psuedo system call for the nfsd's
 115  * Based on the flag value it either:
 116  * - adds a socket to the selection list
 117  * - remains in the kernel as an nfsd
 118  * - remains in the kernel as an nfsiod
 119  *
 120  * MPALMOSTSAFE
 121  */
 122 int
 123 sys_nfssvc(struct nfssvc_args *uap)
 124 {
 125 #ifndef NFS_NOSERVER
 126         struct nlookupdata nd;
 127         struct file *fp;
 128         struct sockaddr *nam;
 129         struct nfsd_args nfsdarg;
 130         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
 131         struct nfsd_cargs ncd;
 132         struct nfsd *nfsd;
 133         struct nfssvc_sock *slp;
 134         struct nfsuid *nuidp;
 135         struct nfsmount *nmp;
 136         struct vnode *vp;
 137 #endif /* NFS_NOSERVER */
 138         int error;
 139         struct thread *td = curthread;
 140
 141         /*
 142          * Must be super user
 143          */
 144         error = priv_check(td, PRIV_ROOT);
 145         if (error)
 146                 return (error);
 147
 148         lwkt_gettoken(&nfs_token);
 149
 150         while (nfssvc_sockhead_flag & SLP_INIT) {
 151                 nfssvc_sockhead_flag |= SLP_WANTINIT;
 152                 tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
 153         }
 154         if (uap->flag & NFSSVC_BIOD)
 155                 error = ENXIO;          /* no longer need nfsiod's */
 156 #ifdef NFS_NOSERVER
 157         else
 158                 error = ENXIO;
 159 #else /* !NFS_NOSERVER */
 160         else if (uap->flag & NFSSVC_MNTD) {
 161                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
 162                 if (error)
 163                         goto done;
 164                 vp = NULL;
 165                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE,
 166                                         NLC_FOLLOW);
 167                 if (error == 0)
 168                         error = nlookup(&nd);
 169                 if (error == 0)
 170                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);
 171                 nlookup_done(&nd);
 172                 if (error)
 173                         goto done;
 174
 175                 if ((vp->v_flag & VROOT) == 0)
 176                         error = EINVAL;
 177                 nmp = VFSTONFS(vp->v_mount);
 178                 vput(vp);
 179                 if (error)
 180                         goto done;
 181                 if ((nmp->nm_state & NFSSTA_MNTD) &&
 182                         (uap->flag & NFSSVC_GOTAUTH) == 0) {
 183                         error = 0;
 184                         goto done;
 185                 }
 186                 nmp->nm_state |= NFSSTA_MNTD;
 187                 error = nfs_clientd(nmp, td->td_ucred, &ncd, uap->flag,
 188                                     uap->argp, td);
 189         } else if (uap->flag & NFSSVC_ADDSOCK) {
 190                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
 191                 if (error)
 192                         goto done;
 193                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
 194                 if (error)
 195                         goto done;
 196                 /*
 197                  * Get the client address for connected sockets.
 198                  */
 199                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
 200                         nam = NULL;
 201                 else {
 202                         error = getsockaddr(&nam, nfsdarg.name,
 203                                             nfsdarg.namelen);
 204                         if (error) {
 205                                 fdrop(fp);
 206                                 goto done;
 207                         }
 208                 }
 209                 error = nfssvc_addsock(fp, nam, td);
 210                 fdrop(fp);
 211         } else {
 212                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
 213                 if (error)
 214                         goto done;
 215                 if ((uap->flag & NFSSVC_AUTHIN) &&
 216                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
 217                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
 218                         slp = nfsd->nfsd_slp;
 219
 220                         /*
 221                          * First check to see if another nfsd has already
 222                          * added this credential.
 223                          */
 224                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
 225                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
 226                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
 227                                     (!nfsd->nfsd_nd->nd_nam2 ||
 228                                      netaddr_match(NU_NETFAM(nuidp),
 229                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
 230                                         break;
 231                         }
 232                         if (nuidp) {
 233                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
 234                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 235                         } else {
 236                             /*
 237                              * Nope, so we will.
 238                              */
 239                             if (slp->ns_numuids < nuidhash_max) {
 240                                 slp->ns_numuids++;
 241                                 nuidp = (struct nfsuid *)
 242                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
 243                                         M_WAITOK);
 244                             } else
 245                                 nuidp = NULL;
 246                             if ((slp->ns_flag & SLP_VALID) == 0) {
 247                                 if (nuidp)
 248                                     kfree((caddr_t)nuidp, M_NFSUID);
 249                             } else {
 250                                 if (nuidp == NULL) {
 251                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
 252                                     LIST_REMOVE(nuidp, nu_hash);
 253                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
 254                                         nu_lru);
 255                                     if (nuidp->nu_flag & NU_NAM)
 256                                         kfree(nuidp->nu_nam, M_SONAME);
 257                                 }
 258                                 nuidp->nu_flag = 0;
 259                                 nuidp->nu_cr = nsd->nsd_cr;
 260                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
 261                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
 262                                 nuidp->nu_cr.cr_ref = 1;
 263                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
 264                                 nuidp->nu_expire = time_uptime + nsd->nsd_ttl;
 265                                 /*
 266                                  * and save the session key in nu_key.
 267                                  */
 268                                 bcopy(nsd->nsd_key, nuidp->nu_key,
 269                                     sizeof (nsd->nsd_key));
 270                                 if (nfsd->nfsd_nd->nd_nam2) {
 271                                     struct sockaddr_in *saddr;
 272
 273                                     saddr = (struct sockaddr_in *)
 274                                             nfsd->nfsd_nd->nd_nam2;
 275                                     switch (saddr->sin_family) {
 276                                     case AF_INET:
 277                                         nuidp->nu_flag |= NU_INETADDR;
 278                                         nuidp->nu_inetaddr =
 279                                              saddr->sin_addr.s_addr;
 280                                         break;
 281                                     case AF_ISO:
 282                                     default:
 283                                         nuidp->nu_flag |= NU_NAM;
 284                                         nuidp->nu_nam =
 285                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
 286                                         break;
 287                                     };
 288                                 }
 289                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
 290                                         nu_lru);
 291                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
 292                                         nuidp, nu_hash);
 293                                 nfsrv_setcred(&nuidp->nu_cr,
 294                                     &nfsd->nfsd_nd->nd_cr);
 295                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
 296                             }
 297                         }
 298                 }
 299                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
 300                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
 301                 error = nfssvc_nfsd(nsd, uap->argp, td);
 302         }
 303 #endif /* NFS_NOSERVER */
 304         if (error == EINTR || error == ERESTART)
 305                 error = 0;
 306 done:
 307         lwkt_reltoken(&nfs_token);
 308         return (error);
 309 }
 310
 311 #ifndef NFS_NOSERVER
 312 /*
 313  * Adds a socket to the list for servicing by nfsds.
 314  */
 315 static int
 316 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
 317 {
 318         int siz;
 319         struct nfssvc_sock *slp;
 320         struct socket *so;
 321         int error;
 322
 323         so = (struct socket *)fp->f_data;
 324 #if 0
 325         tslp = NULL;
 326         /*
 327          * Add it to the list, as required.
 328          */
 329         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
 330                 tslp = nfs_udpsock;
 331                 if (tslp->ns_flag & SLP_VALID) {
 332                         if (mynam != NULL)
 333                                 kfree(mynam, M_SONAME);
 334                         return (EPERM);
 335                 }
 336         }
 337 #endif
 338         /*
 339          * Reserve buffer space in the socket.  Note that due to bugs in
 340          * Linux's delayed-ack code, serious performance degredation may
 341          * occur with linux hosts if the minimum is used.
 342          *
 343          * NFS sockets are not limited to the standard sb_max or by
 344          * resource limits.
 345          */
 346         if (so->so_type == SOCK_STREAM)
 347                 siz = NFS_MAXPACKET + sizeof (u_long);
 348         else
 349                 siz = NFS_MAXPACKET;
 350         if (siz < nfs_soreserve)
 351             siz = nfs_soreserve;
 352
 353         error = soreserve(so, siz, siz, NULL);
 354         if (error) {
 355                 if (mynam != NULL)
 356                         kfree(mynam, M_SONAME);
 357                 return (error);
 358         }
 359
 360         /*
 361          * Set protocol specific options { for now TCP only } and
 362          * reserve some space. For datagram sockets, this can get called
 363          * repeatedly for the same socket, but that isn't harmful.
 364          */
 365         if (so->so_type == SOCK_STREAM) {
 366                 struct sockopt sopt;
 367                 int val;
 368
 369                 bzero(&sopt, sizeof sopt);
 370                 sopt.sopt_level = SOL_SOCKET;
 371                 sopt.sopt_name = SO_KEEPALIVE;
 372                 sopt.sopt_val = &val;
 373                 sopt.sopt_valsize = sizeof val;
 374                 val = 1;
 375                 sosetopt(so, &sopt);
 376         }
 377         if (so->so_proto->pr_domain->dom_family == AF_INET &&
 378             so->so_proto->pr_protocol == IPPROTO_TCP) {
 379                 struct sockopt sopt;
 380                 int val;
 381
 382                 bzero(&sopt, sizeof sopt);
 383                 sopt.sopt_level = IPPROTO_TCP;
 384                 sopt.sopt_name = TCP_NODELAY;
 385                 sopt.sopt_val = &val;
 386                 sopt.sopt_valsize = sizeof val;
 387                 val = 1;
 388                 sosetopt(so, &sopt);
 389
 390                 bzero(&sopt, sizeof sopt);
 391                 sopt.sopt_level = IPPROTO_TCP;
 392                 sopt.sopt_name = TCP_FASTKEEP;
 393                 sopt.sopt_val = &val;
 394                 sopt.sopt_valsize = sizeof val;
 395                 val = 1;
 396                 sosetopt(so, &sopt);
 397         }
 398         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
 399         so->so_rcv.ssb_timeo = 0;
 400         atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR);
 401         so->so_snd.ssb_timeo = 0;
 402
 403         slp = kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 404         mtx_init(&slp->ns_solock);
 405         STAILQ_INIT(&slp->ns_rec);
 406         TAILQ_INIT(&slp->ns_uidlruhead);
 407         lwkt_token_init(&slp->ns_token, "nfssrv_token");
 408
 409         lwkt_gettoken(&nfs_token);
 410         nfsrv_slpref(slp);
 411         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
 412         lwkt_gettoken(&slp->ns_token);
 413
 414         slp->ns_so = so;
 415         slp->ns_nam = mynam;
 416         fp->f_count++;
 417         slp->ns_fp = fp;
 418
 419         so->so_upcallarg = (caddr_t)slp;
 420         so->so_upcall = nfsrv_rcv_upcall;
 421         atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
 422         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
 423         nfsrv_wakenfsd(slp, 1);
 424
 425         lwkt_reltoken(&slp->ns_token);
 426         lwkt_reltoken(&nfs_token);
 427
 428         return (0);
 429 }
 430
 431 /*
 432  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
 433  * until it is killed by a signal.
 434  */
 435 static int
 436 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
 437 {
 438         int siz;
 439         struct nfssvc_sock *slp;
 440         struct nfsd *nfsd = nsd->nsd_nfsd;
 441         struct nfsrv_descript *nd = NULL;
 442         struct mbuf *m, *mreq;
 443         int error, cacherep, sotype, writes_todo;
 444         int procrastinate;
 445         u_quad_t cur_usec;
 446
 447 #ifndef nolint
 448         cacherep = RC_DOIT;
 449         writes_todo = 0;
 450 #endif
 451         lwkt_gettoken(&nfs_token);
 452
 453         if (nfsd == NULL) {
 454                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
 455                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
 456                 nfsd->nfsd_td = td;
 457                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
 458                 nfs_numnfsd++;
 459         }
 460
 461         /*
 462          * Loop getting rpc requests until SIGKILL.
 463          */
 464         for (;;) {
 465                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
 466                         while (nfsd->nfsd_slp == NULL &&
 467                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
 468                                 nfsd->nfsd_flag |= NFSD_WAITING;
 469                                 nfsd_waiting++;
 470                                 error = tsleep(nfsd, PCATCH, "nfsd", 0);
 471                                 nfsd_waiting--;
 472                                 if (error && nfsd->nfsd_slp == NULL)
 473                                         goto done;
 474                         }
 475                         if (nfsd->nfsd_slp == NULL &&
 476                             (nfsd_head_flag & NFSD_CHECKSLP)) {
 477                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
 478                                     if ((slp->ns_flag & SLP_ACTION_MASK) ||
 479                                         slp->ns_needq_upcall) {
 480                                             nfsrv_slpref(slp);
 481                                             nfsd->nfsd_slp = slp;
 482                                             break;
 483                                     }
 484                                 }
 485                                 if (slp == NULL)
 486                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
 487                         }
 488                         if ((slp = nfsd->nfsd_slp) == NULL)
 489                                 continue;
 490
 491                         lwkt_reltoken(&nfs_token);
 492                         lwkt_gettoken(&slp->ns_token);
 493
 494                         if (slp->ns_needq_upcall) {
 495                                 slp->ns_needq_upcall = 0;
 496                                 slp->ns_flag |= SLP_NEEDQ;
 497                         }
 498
 499                         if (slp->ns_flag & SLP_VALID) {
 500                                 /*
 501                                  * We can both process additional received
 502                                  * data into new records and process existing
 503                                  * records.  This keeps the pipeline hot by
 504                                  * allowing the tcp socket to continue to
 505                                  * drain while we are processing records.
 506                                  */
 507                                 if (slp->ns_flag & SLP_DISCONN) {
 508                                         nfsrv_zapsock(slp);
 509                                 } else if (slp->ns_flag & SLP_NEEDQ) {
 510                                         (void)nfs_slplock(slp, 1);
 511                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
 512                                                   MB_WAIT);
 513                                         nfs_slpunlock(slp);
 514                                 }
 515                                 error = nfsrv_dorec(slp, nfsd, &nd);
 516                                 cur_usec = nfs_curusec();
 517                                 if (error && slp->ns_tq.lh_first &&
 518                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
 519                                         error = 0;
 520                                         cacherep = RC_DOIT;
 521                                         writes_todo = 1;
 522                                 } else {
 523                                         writes_todo = 0;
 524                                 }
 525                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
 526                         } else {
 527                                 slp->ns_flag &= ~SLP_ACTION_MASK;
 528                                 error = 0;
 529                         }
 530                 } else {
 531                         error = 0;
 532                         slp = nfsd->nfsd_slp;
 533
 534                         lwkt_reltoken(&nfs_token);
 535                         lwkt_gettoken(&slp->ns_token);
 536
 537                         if (slp->ns_needq_upcall) {
 538                                 slp->ns_needq_upcall = 0;
 539                                 slp->ns_flag |= SLP_NEEDQ;
 540                         }
 541                         if (NFSRV_RECLIMIT(slp) == 0 &&
 542                             (slp->ns_flag & SLP_NEEDQ)) {
 543                                 (void)nfs_slplock(slp, 1);
 544                                 nfsrv_rcv(slp->ns_so, (caddr_t)slp,
 545                                           MB_WAIT);
 546                                 nfs_slpunlock(slp);
 547                         }
 548                 }
 549
 550                 /*
 551                  * nfs_token not held here.  slp token is held.
 552                  */
 553                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
 554                         if (nd) {
 555                                 kfree((caddr_t)nd, M_NFSRVDESC);
 556                                 nd = NULL;
 557                         }
 558                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 559                         if (slp->ns_flag & SLP_ACTION_MASK) {
 560                                 lwkt_reltoken(&slp->ns_token);
 561                                 lwkt_gettoken(&nfs_token);
 562                         } else {
 563                                 nfsd->nfsd_slp = NULL;
 564                                 lwkt_reltoken(&slp->ns_token);
 565                                 lwkt_gettoken(&nfs_token);
 566                                 nfsrv_slpderef(slp);
 567                         }
 568                         continue;
 569                 }
 570
 571                 /*
 572                  * Execute the NFS request - handle the server side cache
 573                  *
 574                  * nfs_token not held here.  slp token is held.
 575                  */
 576                 sotype = slp->ns_so->so_type;
 577                 if (nd) {
 578                     getmicrotime(&nd->nd_starttime);
 579                     if (nd->nd_nam2)
 580                         nd->nd_nam = nd->nd_nam2;
 581                     else
 582                         nd->nd_nam = slp->ns_nam;
 583
 584                     /*
 585                      * Check to see if authorization is needed.
 586                      */
 587                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
 588                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
 589                         nsd->nsd_haddr =
 590                                 ((struct sockaddr_in *)
 591                                  nd->nd_nam)->sin_addr.s_addr;
 592                         nsd->nsd_authlen = nfsd->nfsd_authlen;
 593                         nsd->nsd_verflen = nfsd->nfsd_verflen;
 594                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
 595                                 nfsd->nfsd_authlen) &&
 596                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
 597                                 nfsd->nfsd_verflen) &&
 598                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
 599                         {
 600                             lwkt_reltoken(&slp->ns_token);
 601                             return (ENEEDAUTH);
 602                         }
 603                         cacherep = RC_DROPIT;
 604                     } else {
 605                         cacherep = nfsrv_getcache(nd, slp, &mreq);
 606                     }
 607
 608                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
 609                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
 610                         nd->nd_procnum = NFSPROC_NOOP;
 611                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 612                         cacherep = RC_DOIT;
 613                     } else if (nfs_privport) {
 614                         /* Check if source port is privileged */
 615                         u_short port;
 616                         struct sockaddr *nam = nd->nd_nam;
 617                         struct sockaddr_in *sin;
 618
 619                         sin = (struct sockaddr_in *)nam;
 620                         port = ntohs(sin->sin_port);
 621                         if (port >= IPPORT_RESERVED &&
 622                             nd->nd_procnum != NFSPROC_NULL) {
 623                             nd->nd_procnum = NFSPROC_NOOP;
 624                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
 625                             cacherep = RC_DOIT;
 626                             kprintf("NFS request from unprivileged port (%s:%d)\n",
 627                                    inet_ntoa(sin->sin_addr), port);
 628                         }
 629                     }
 630
 631                 }
 632
 633                 /*
 634                  * Execute the NFS request - direct execution
 635                  *
 636                  * Loop to get all the write rpc replies that have been
 637                  * gathered together.
 638                  *
 639                  * nfs_token not held here.  slp token is held.
 640                  */
 641                 do {
 642                     switch (cacherep) {
 643                     case RC_DOIT:
 644                         if (nd && (nd->nd_flag & ND_NFSV3))
 645                             procrastinate = nfsrvw_procrastinate_v3;
 646                         else
 647                             procrastinate = nfsrvw_procrastinate;
 648                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
 649                             procrastinate > 0)
 650                         ) {
 651                             error = nfsrv_writegather(&nd, slp,
 652                                                       nfsd->nfsd_td, &mreq);
 653                         } else {
 654                             /* NOT YET lwkt_reltoken(&slp->ns_token); */
 655                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
 656                                                 slp, nfsd->nfsd_td, &mreq);
 657                             /* NOT YET lwkt_gettoken(&slp->ns_token); */
 658                             lwpkthreaddeferred();       /* vnlru issues */
 659                         }
 660                         if (mreq == NULL)
 661                                 break;
 662                         if (error != 0 && error != NFSERR_RETVOID) {
 663                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
 664                                         nfsstats.srv_errs++;
 665                                 nfsrv_updatecache(nd, FALSE, mreq);
 666                                 if (nd->nd_nam2)
 667                                         kfree(nd->nd_nam2, M_SONAME);
 668                                 break;
 669                         }
 670                         nfsstats.srvrpccnt[nd->nd_procnum]++;
 671                         nfsrv_updatecache(nd, TRUE, mreq);
 672                         nd->nd_mrep = NULL;
 673                         /* FALL THROUGH */
 674                     case RC_REPLY:
 675                         m = mreq;
 676                         siz = 0;
 677                         while (m) {
 678                                 siz += m->m_len;
 679                                 m = m->m_next;
 680                         }
 681                         if (siz <= 0 || siz > NFS_MAXPACKET) {
 682                                 kprintf("mbuf siz=%d\n",siz);
 683                                 panic("Bad nfs svc reply");
 684                         }
 685                         m = mreq;
 686                         m->m_pkthdr.len = siz;
 687                         m->m_pkthdr.rcvif = NULL;
 688                         /*
 689                          * For stream protocols, prepend a Sun RPC
 690                          * Record Mark.
 691                          */
 692                         if (sotype == SOCK_STREAM) {
 693                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
 694                                 if (m == NULL) {
 695                                         error = ENOBUFS;
 696                                         goto skip;
 697                                 }
 698                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
 699                         }
 700                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 701                                 (void) nfs_slplock(slp, 1);
 702                         if (slp->ns_flag & SLP_VALID)
 703                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
 704                         else {
 705                             error = EPIPE;
 706                             m_freem(m);
 707                         }
 708 skip:
 709                         if (nfsrtton)
 710                                 nfsd_rt(sotype, nd, cacherep);
 711                         if (nd->nd_nam2)
 712                                 kfree(nd->nd_nam2, M_SONAME);
 713                         if (nd->nd_mrep)
 714                                 m_freem(nd->nd_mrep);
 715                         if (error == EPIPE || error == ENOBUFS)
 716                                 nfsrv_zapsock(slp);
 717                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
 718                                 nfs_slpunlock(slp);
 719                         if (error == EINTR || error == ERESTART) {
 720                                 kfree((caddr_t)nd, M_NFSRVDESC);
 721                                 lwkt_reltoken(&slp->ns_token);
 722                                 lwkt_gettoken(&nfs_token);
 723                                 nfsd->nfsd_slp = NULL;
 724                                 nfsrv_slpderef(slp);
 725                                 goto done;
 726                         }
 727                         break;
 728                     case RC_DROPIT:
 729                         if (nfsrtton)
 730                                 nfsd_rt(sotype, nd, cacherep);
 731                         m_freem(nd->nd_mrep);
 732                         if (nd->nd_nam2)
 733                                 kfree(nd->nd_nam2, M_SONAME);
 734                         break;
 735                     };
 736                     if (nd) {
 737                         kfree((caddr_t)nd, M_NFSRVDESC);
 738                         nd = NULL;
 739                     }
 740
 741                     /*
 742                      * Check to see if there are outstanding writes that
 743                      * need to be serviced.
 744                      */
 745                     cur_usec = nfs_curusec();
 746                     if (slp->ns_tq.lh_first &&
 747                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
 748                         cacherep = RC_DOIT;
 749                         writes_todo = 1;
 750                     } else {
 751                         writes_todo = 0;
 752                     }
 753                 } while (writes_todo);
 754
 755                 /*
 756                  * nfs_token not held here.  slp token is held.
 757                  */
 758                 if (nfsrv_dorec(slp, nfsd, &nd)) {
 759                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
 760                         if (slp->ns_flag & SLP_ACTION_MASK) {
 761                                 lwkt_reltoken(&slp->ns_token);
 762                                 lwkt_gettoken(&nfs_token);
 763                         } else {
 764                                 nfsd->nfsd_slp = NULL;
 765                                 lwkt_reltoken(&slp->ns_token);
 766                                 lwkt_gettoken(&nfs_token);
 767                                 nfsrv_slpderef(slp);
 768                         }
 769                 } else {
 770                         lwkt_reltoken(&slp->ns_token);
 771                         lwkt_gettoken(&nfs_token);
 772                 }
 773         }
 774 done:
 775         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
 776         kfree((caddr_t)nfsd, M_NFSD);
 777         nsd->nsd_nfsd = NULL;
 778         if (--nfs_numnfsd == 0)
 779                 nfsrv_init(TRUE);       /* Reinitialize everything */
 780
 781         lwkt_reltoken(&nfs_token);
 782         return (error);
 783 }
 784
 785 /*
 786  * Shut down a socket associated with an nfssvc_sock structure.
 787  * Should be called with the send lock set, if required.
 788  * The trick here is to increment the sref at the start, so that the nfsds
 789  * will stop using it and clear ns_flag at the end so that it will not be
 790  * reassigned during cleanup.
 791  */
 792 static void
 793 nfsrv_zapsock(struct nfssvc_sock *slp)
 794 {
 795         struct nfsuid *nuidp, *nnuidp;
 796         struct nfsrv_descript *nwp, *nnwp;
 797         struct socket *so;
 798         struct file *fp;
 799         struct nfsrv_rec *rec;
 800
 801         slp->ns_flag &= ~SLP_ALLFLAGS;
 802         fp = slp->ns_fp;
 803         if (fp) {
 804                 slp->ns_fp = NULL;
 805                 so = slp->ns_so;
 806                 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
 807                 so->so_upcall = NULL;
 808                 so->so_upcallarg = NULL;
 809                 soshutdown(so, SHUT_RDWR);
 810                 closef(fp, NULL);
 811                 if (slp->ns_nam)
 812                         kfree(slp->ns_nam, M_SONAME);
 813                 m_freem(slp->ns_raw);
 814                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
 815                         --slp->ns_numrec;
 816                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
 817                         if (rec->nr_address)
 818                                 kfree(rec->nr_address, M_SONAME);
 819                         m_freem(rec->nr_packet);
 820                         kfree(rec, M_NFSRVDESC);
 821                 }
 822                 KKASSERT(slp->ns_numrec == 0);
 823
 824                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
 825                                       nnuidp) {
 826                         LIST_REMOVE(nuidp, nu_hash);
 827                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
 828                         if (nuidp->nu_flag & NU_NAM)
 829                                 kfree(nuidp->nu_nam, M_SONAME);
 830                         kfree((caddr_t)nuidp, M_NFSUID);
 831                 }
 832                 crit_enter();
 833                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
 834                         nnwp = nwp->nd_tq.le_next;
 835                         LIST_REMOVE(nwp, nd_tq);
 836                         kfree((caddr_t)nwp, M_NFSRVDESC);
 837                 }
 838                 LIST_INIT(&slp->ns_tq);
 839                 crit_exit();
 840                 nfsrv_slpderef(slp);
 841         }
 842 }
 843
 844 /*
 845  * Derefence a server socket structure. If it has no more references and
 846  * is no longer valid, you can throw it away.
 847  *
 848  * Must be holding nfs_token!
 849  */
 850 void
 851 nfsrv_slpderef(struct nfssvc_sock *slp)
 852 {
 853         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
 854         if (slp->ns_sref == 1) {
 855                 KKASSERT((slp->ns_flag & SLP_VALID) == 0);
 856                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 857                 slp->ns_sref = 0;
 858                 kfree((caddr_t)slp, M_NFSSVC);
 859         } else {
 860                 --slp->ns_sref;
 861         }
 862 }
 863
 864 void
 865 nfsrv_slpref(struct nfssvc_sock *slp)
 866 {
 867         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
 868         ++slp->ns_sref;
 869 }
 870
 871 /*
 872  * Lock a socket against others.
 873  *
 874  * Returns 0 on failure, 1 on success.
 875  */
 876 int
 877 nfs_slplock(struct nfssvc_sock *slp, int wait)
 878 {
 879         mtx_t mtx = &slp->ns_solock;
 880
 881         if (wait) {
 882                 mtx_lock_ex(mtx, "nfsslplck", 0, 0);
 883                 return(1);
 884         } else if (mtx_lock_ex_try(mtx) == 0) {
 885                 return(1);
 886         } else {
 887                 return(0);
 888         }
 889 }
 890
 891 /*
 892  * Unlock the stream socket for others.
 893  */
 894 void
 895 nfs_slpunlock(struct nfssvc_sock *slp)
 896 {
 897         mtx_t mtx = &slp->ns_solock;
 898
 899         mtx_unlock(mtx);
 900 }
 901
 902 /*
 903  * Initialize the data structures for the server.
 904  * Handshake with any new nfsds starting up to avoid any chance of
 905  * corruption.
 906  */
 907 void
 908 nfsrv_init(int terminating)
 909 {
 910         struct nfssvc_sock *slp, *nslp;
 911
 912         lwkt_gettoken(&nfs_token);
 913         if (nfssvc_sockhead_flag & SLP_INIT)
 914                 panic("nfsd init");
 915         nfssvc_sockhead_flag |= SLP_INIT;
 916
 917         if (terminating) {
 918                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
 919                         if (slp->ns_flag & SLP_VALID)
 920                                 nfsrv_zapsock(slp);
 921                         /*
 922                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
 923                         kfree((caddr_t)slp, M_NFSSVC);
 924                         */
 925                 }
 926                 nfsrv_cleancache();     /* And clear out server cache */
 927         } else {
 928                 nfs_pub.np_valid = 0;
 929         }
 930
 931         TAILQ_INIT(&nfssvc_sockhead);
 932         nfssvc_sockhead_flag &= ~SLP_INIT;
 933         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
 934                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
 935                 wakeup((caddr_t)&nfssvc_sockhead);
 936         }
 937
 938         TAILQ_INIT(&nfsd_head);
 939         nfsd_head_flag &= ~NFSD_CHECKSLP;
 940
 941         lwkt_reltoken(&nfs_token);
 942
 943 #if 0
 944         nfs_udpsock = (struct nfssvc_sock *)
 945             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 946         mtx_init(&nfs_udpsock->ns_solock);
 947         STAILQ_INIT(&nfs_udpsock->ns_rec);
 948         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
 949         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
 950
 951         nfs_cltpsock = (struct nfssvc_sock *)
 952             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
 953         mtx_init(&nfs_cltpsock->ns_solock);
 954         STAILQ_INIT(&nfs_cltpsock->ns_rec);
 955         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
 956         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
 957 #endif
 958 }
 959
 960 /*
 961  * Add entries to the server monitor log.
 962  */
 963 static void
 964 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
 965 {
 966         struct drt *rt;
 967
 968         rt = &nfsdrt.drt[nfsdrt.pos];
 969         if (cacherep == RC_DOIT)
 970                 rt->flag = 0;
 971         else if (cacherep == RC_REPLY)
 972                 rt->flag = DRT_CACHEREPLY;
 973         else
 974                 rt->flag = DRT_CACHEDROP;
 975         if (sotype == SOCK_STREAM)
 976                 rt->flag |= DRT_TCP;
 977         if (nd->nd_flag & ND_NFSV3)
 978                 rt->flag |= DRT_NFSV3;
 979         rt->proc = nd->nd_procnum;
 980         if (nd->nd_nam->sa_family == AF_INET)
 981             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
 982         else
 983             rt->ipadr = INADDR_ANY;
 984         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
 985         getmicrotime(&rt->tstamp);
 986         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
 987 }
 988 #endif /* NFS_NOSERVER */
 989
 990 /*
 991  * Get an authorization string for the uid by having the mount_nfs sitting
 992  * on this mount point porpous out of the kernel and do it.
 993  */
 994 int
 995 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
 996             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
 997             int *verf_len, NFSKERBKEY_T key /* return session key */)
 998 {
 999         int error = 0;
1000
1001         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
1002                 nmp->nm_state |= NFSSTA_WANTAUTH;
1003                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
1004                         "nfsauth1", 2 * hz);
1005                 error = nfs_sigintr(nmp, rep, rep->r_td);
1006                 if (error) {
1007                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
1008                         return (error);
1009                 }
1010         }
1011         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
1012         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
1013         nmp->nm_authlen = RPCAUTH_MAXSIZ;
1014         nmp->nm_verfstr = verf_str;
1015         nmp->nm_verflen = *verf_len;
1016         nmp->nm_authuid = cred->cr_uid;
1017         wakeup((caddr_t)&nmp->nm_authstr);
1018
1019         /*
1020          * And wait for mount_nfs to do its stuff.
1021          */
1022         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
1023                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
1024                         "nfsauth2", 2 * hz);
1025                 error = nfs_sigintr(nmp, rep, rep->r_td);
1026         }
1027         if (nmp->nm_state & NFSSTA_AUTHERR) {
1028                 nmp->nm_state &= ~NFSSTA_AUTHERR;
1029                 error = EAUTH;
1030         }
1031         if (error)
1032                 kfree((caddr_t)*auth_str, M_TEMP);
1033         else {
1034                 *auth_len = nmp->nm_authlen;
1035                 *verf_len = nmp->nm_verflen;
1036                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (NFSKERBKEY_T));
1037         }
1038         nmp->nm_state &= ~NFSSTA_HASAUTH;
1039         nmp->nm_state |= NFSSTA_WAITAUTH;
1040         if (nmp->nm_state & NFSSTA_WANTAUTH) {
1041                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
1042                 wakeup((caddr_t)&nmp->nm_authtype);
1043         }
1044         return (error);
1045 }
1046
1047 /*
1048  * Get a nickname authenticator and verifier.
1049  */
1050 int
1051 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
1052                 int *auth_len, char *verf_str, int verf_len)
1053 {
1054         struct nfsuid *nuidp;
1055         u_int32_t *nickp, *verfp;
1056         struct timeval ktvout;
1057
1058 #ifdef DIAGNOSTIC
1059         if (verf_len < (4 * NFSX_UNSIGNED))
1060                 panic("nfs_getnickauth verf too small");
1061 #endif
1062         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
1063             nuidp != NULL; nuidp = nuidp->nu_hash.le_next) {
1064                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
1065                         break;
1066         }
1067         if (!nuidp || nuidp->nu_expire < time_uptime)
1068                 return (EACCES);
1069
1070         /*
1071          * Move to the end of the lru list (end of lru == most recently used).
1072          */
1073         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1074         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
1075
1076         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
1077         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
1078         *nickp = txdr_unsigned(nuidp->nu_nickname);
1079         *auth_str = (char *)nickp;
1080         *auth_len = 2 * NFSX_UNSIGNED;
1081
1082         /*
1083          * Now we must encrypt the verifier and package it up.
1084          */
1085         verfp = (u_int32_t *)verf_str;
1086         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
1087         if (time_second != nuidp->nu_timestamp.tv_sec ||
1088             (time_second == nuidp->nu_timestamp.tv_sec &&
1089              time_second > nuidp->nu_timestamp.tv_usec))        /* XXX */
1090                 getmicrotime(&nuidp->nu_timestamp);
1091         else
1092                 nuidp->nu_timestamp.tv_usec++;
1093
1094         /*
1095          * Now encrypt the timestamp verifier in ecb mode using the session
1096          * key.
1097          */
1098 #ifdef NFSKERB
1099         XXX
1100 #else
1101         ktvout.tv_sec = 0;
1102         ktvout.tv_usec = 0;
1103 #endif
1104
1105         *verfp++ = ktvout.tv_sec;
1106         *verfp++ = ktvout.tv_usec;
1107         *verfp = 0;
1108         return (0);
1109 }
1110
1111 /*
1112  * Save the current nickname in a hash list entry on the mount point.
1113  */
1114 int
1115 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1116                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1117                  struct mbuf *mrep)
1118 {
1119         struct nfsuid *nuidp;
1120         u_int32_t *tl;
1121         struct timeval ktvin, ktvout;
1122         u_int32_t nick;
1123         int deltasec, error = 0;
1124         struct nfsm_info info;
1125
1126         info.md = *mdp;
1127         info.dpos = *dposp;
1128         info.mrep = mrep;
1129
1130         if (len == (3 * NFSX_UNSIGNED)) {
1131                 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
1132                 ktvin.tv_sec = *tl++;
1133                 ktvin.tv_usec = *tl++;
1134                 nick = fxdr_unsigned(u_int32_t, *tl);
1135
1136                 /*
1137                  * Decrypt the timestamp in ecb mode.
1138                  */
1139 #ifdef NFSKERB
1140                 XXX
1141 #else
1142                 ktvout.tv_sec = 0;
1143                 ktvout.tv_usec = 0;
1144 #endif
1145                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1146                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1147                 deltasec = time_second - ktvout.tv_sec;
1148                 if (deltasec < 0)
1149                         deltasec = -deltasec;
1150                 /*
1151                  * If ok, add it to the hash list for the mount point.
1152                  */
1153                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1154                         if (nmp->nm_numuids < nuidhash_max) {
1155                                 nmp->nm_numuids++;
1156                                 nuidp = (struct nfsuid *)
1157                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1158                                         M_WAITOK);
1159                         } else {
1160                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1161                                 LIST_REMOVE(nuidp, nu_hash);
1162                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1163                                         nu_lru);
1164                         }
1165                         nuidp->nu_flag = 0;
1166                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1167                         nuidp->nu_expire = time_uptime + NFS_KERBTTL;
1168                         nuidp->nu_timestamp = ktvout;
1169                         nuidp->nu_nickname = nick;
1170                         bcopy(key, nuidp->nu_key, sizeof (NFSKERBKEY_T));
1171                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1172                                 nu_lru);
1173                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1174                                 nuidp, nu_hash);
1175                 }
1176         } else {
1177                 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
1178         }
1179 nfsmout:
1180         *mdp = info.md;
1181         *dposp = info.dpos;
1182         return (error);
1183 }