df7a669847c35f36063125828d366570e1a5f11c
[dragonfly.git] / sys / vfs / nfs / nfs_syscalls.c
1 /*
2  * Copyright (c) 1989, 1993
3  *      The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Rick Macklem at The University of Guelph.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *      This product includes software developed by the University of
19  *      California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
37  * $FreeBSD: src/sys/nfs/nfs_syscalls.c,v 1.58.2.1 2000/11/26 02:30:06 dillon Exp $
38  * $DragonFly: src/sys/vfs/nfs/nfs_syscalls.c,v 1.31 2008/01/05 14:02:41 swildner Exp $
39  */
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/sysproto.h>
44 #include <sys/kernel.h>
45 #include <sys/sysctl.h>
46 #include <sys/file.h>
47 #include <sys/filedesc.h>
48 #include <sys/vnode.h>
49 #include <sys/malloc.h>
50 #include <sys/mount.h>
51 #include <sys/proc.h>
52 #include <sys/priv.h>
53 #include <sys/buf.h>
54 #include <sys/mbuf.h>
55 #include <sys/resourcevar.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/domain.h>
59 #include <sys/protosw.h>
60 #include <sys/nlookup.h>
61 #include <vm/vm_zone.h>
62
63 #include <sys/mutex2.h>
64 #include <sys/thread2.h>
65
66 #include <netinet/in.h>
67 #include <netinet/tcp.h>
68 #include "xdr_subs.h"
69 #include "rpcv2.h"
70 #include "nfsproto.h"
71 #include "nfs.h"
72 #include "nfsm_subs.h"
73 #include "nfsrvcache.h"
74 #include "nfsmount.h"
75 #include "nfsnode.h"
76 #include "nfsrtt.h"
77
78 #include <sys/thread2.h>
79
80 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
81
82 static int nuidhash_max = NFS_MAXUIDHASH;
83
84 #ifndef NFS_NOSERVER
85 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
86 #endif
87
88 #define TRUE    1
89 #define FALSE   0
90
91 SYSCTL_DECL(_vfs_nfs);
92
93 #ifndef NFS_NOSERVER
94 int nfsd_waiting = 0;
95 static struct nfsdrt nfsdrt;
96 static int nfs_numnfsd = 0;
97 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
98                              int cacherep);
99 static int      nfssvc_addsock (struct file *, struct sockaddr *,
100                                     struct thread *);
101 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
102
103 static int nfs_privport = 0;
104 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
105 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
106 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
107 int     nfs_soreserve = NFS_MAXPACKET * NFS_MAXASYNCBIO;
108 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, "");
109
110 /*
111  * NFS server system calls
112  */
113
114 #endif /* NFS_NOSERVER */
115 /*
116  * nfssvc_args(int flag, caddr_t argp)
117  *
118  * Nfs server psuedo system call for the nfsd's
119  * Based on the flag value it either:
120  * - adds a socket to the selection list
121  * - remains in the kernel as an nfsd
122  * - remains in the kernel as an nfsiod
123  *
124  * MPALMOSTSAFE
125  */
126 int
127 sys_nfssvc(struct nfssvc_args *uap)
128 {
129 #ifndef NFS_NOSERVER
130         struct nlookupdata nd;
131         struct file *fp;
132         struct sockaddr *nam;
133         struct nfsd_args nfsdarg;
134         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
135         struct nfsd_cargs ncd;
136         struct nfsd *nfsd;
137         struct nfssvc_sock *slp;
138         struct nfsuid *nuidp;
139         struct nfsmount *nmp;
140         struct vnode *vp;
141 #endif /* NFS_NOSERVER */
142         int error;
143         struct thread *td = curthread;
144
145         /*
146          * Must be super user
147          */
148         error = priv_check(td, PRIV_ROOT);
149         if (error)
150                 return (error);
151
152         lwkt_gettoken(&nfs_token);
153
154         while (nfssvc_sockhead_flag & SLP_INIT) {
155                 nfssvc_sockhead_flag |= SLP_WANTINIT;
156                 tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
157         }
158         if (uap->flag & NFSSVC_BIOD)
159                 error = ENXIO;          /* no longer need nfsiod's */
160 #ifdef NFS_NOSERVER
161         else
162                 error = ENXIO;
163 #else /* !NFS_NOSERVER */
164         else if (uap->flag & NFSSVC_MNTD) {
165                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
166                 if (error)
167                         goto done;
168                 vp = NULL;
169                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE, 
170                                         NLC_FOLLOW);
171                 if (error == 0)
172                         error = nlookup(&nd);
173                 if (error == 0)
174                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);   
175                 nlookup_done(&nd);
176                 if (error)
177                         goto done;
178
179                 if ((vp->v_flag & VROOT) == 0)
180                         error = EINVAL;
181                 nmp = VFSTONFS(vp->v_mount);
182                 vput(vp);
183                 if (error)
184                         goto done;
185                 if ((nmp->nm_state & NFSSTA_MNTD) &&
186                         (uap->flag & NFSSVC_GOTAUTH) == 0) {
187                         error = 0;
188                         goto done;
189                 }
190                 nmp->nm_state |= NFSSTA_MNTD;
191                 error = nfs_clientd(nmp, td->td_ucred, &ncd, uap->flag,
192                                     uap->argp, td);
193         } else if (uap->flag & NFSSVC_ADDSOCK) {
194                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
195                 if (error)
196                         goto done;
197                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
198                 if (error)
199                         goto done;
200                 /*
201                  * Get the client address for connected sockets.
202                  */
203                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
204                         nam = NULL;
205                 else {
206                         error = getsockaddr(&nam, nfsdarg.name,
207                                             nfsdarg.namelen);
208                         if (error) {
209                                 fdrop(fp);
210                                 goto done;
211                         }
212                 }
213                 error = nfssvc_addsock(fp, nam, td);
214                 fdrop(fp);
215         } else {
216                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
217                 if (error)
218                         goto done;
219                 if ((uap->flag & NFSSVC_AUTHIN) &&
220                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
221                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
222                         slp = nfsd->nfsd_slp;
223
224                         /*
225                          * First check to see if another nfsd has already
226                          * added this credential.
227                          */
228                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
229                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
230                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
231                                     (!nfsd->nfsd_nd->nd_nam2 ||
232                                      netaddr_match(NU_NETFAM(nuidp),
233                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
234                                         break;
235                         }
236                         if (nuidp) {
237                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
238                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
239                         } else {
240                             /*
241                              * Nope, so we will.
242                              */
243                             if (slp->ns_numuids < nuidhash_max) {
244                                 slp->ns_numuids++;
245                                 nuidp = (struct nfsuid *)
246                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
247                                         M_WAITOK);
248                             } else
249                                 nuidp = NULL;
250                             if ((slp->ns_flag & SLP_VALID) == 0) {
251                                 if (nuidp)
252                                     kfree((caddr_t)nuidp, M_NFSUID);
253                             } else {
254                                 if (nuidp == NULL) {
255                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
256                                     LIST_REMOVE(nuidp, nu_hash);
257                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
258                                         nu_lru);
259                                     if (nuidp->nu_flag & NU_NAM)
260                                         FREE(nuidp->nu_nam, M_SONAME);
261                                 }
262                                 nuidp->nu_flag = 0;
263                                 nuidp->nu_cr = nsd->nsd_cr;
264                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
265                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
266                                 nuidp->nu_cr.cr_ref = 1;
267                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
268                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
269                                 /*
270                                  * and save the session key in nu_key.
271                                  */
272                                 bcopy(nsd->nsd_key, nuidp->nu_key,
273                                     sizeof (nsd->nsd_key));
274                                 if (nfsd->nfsd_nd->nd_nam2) {
275                                     struct sockaddr_in *saddr;
276
277                                     saddr = (struct sockaddr_in *)
278                                             nfsd->nfsd_nd->nd_nam2;
279                                     switch (saddr->sin_family) {
280                                     case AF_INET:
281                                         nuidp->nu_flag |= NU_INETADDR;
282                                         nuidp->nu_inetaddr =
283                                              saddr->sin_addr.s_addr;
284                                         break;
285                                     case AF_ISO:
286                                     default:
287                                         nuidp->nu_flag |= NU_NAM;
288                                         nuidp->nu_nam = 
289                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
290                                         break;
291                                     };
292                                 }
293                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
294                                         nu_lru);
295                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
296                                         nuidp, nu_hash);
297                                 nfsrv_setcred(&nuidp->nu_cr,
298                                     &nfsd->nfsd_nd->nd_cr);
299                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
300                             }
301                         }
302                 }
303                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
304                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
305                 error = nfssvc_nfsd(nsd, uap->argp, td);
306         }
307 #endif /* NFS_NOSERVER */
308         if (error == EINTR || error == ERESTART)
309                 error = 0;
310 done:
311         lwkt_reltoken(&nfs_token);
312         return (error);
313 }
314
315 #ifndef NFS_NOSERVER
316 /*
317  * Adds a socket to the list for servicing by nfsds.
318  */
319 static int
320 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
321 {
322         int siz;
323         struct nfssvc_sock *slp;
324         struct socket *so;
325         int error;
326
327         so = (struct socket *)fp->f_data;
328 #if 0
329         tslp = NULL;
330         /*
331          * Add it to the list, as required.
332          */
333         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
334                 tslp = nfs_udpsock;
335                 if (tslp->ns_flag & SLP_VALID) {
336                         if (mynam != NULL)
337                                 FREE(mynam, M_SONAME);
338                         return (EPERM);
339                 }
340         }
341 #endif
342         /*
343          * Reserve buffer space in the socket.  Note that due to bugs in
344          * Linux's delayed-ack code, serious performance degredation may
345          * occur with linux hosts if the minimum is used.
346          *
347          * NFS sockets are not limited to the standard sb_max or by
348          * resource limits.
349          */
350         if (so->so_type == SOCK_STREAM)
351                 siz = NFS_MAXPACKET + sizeof (u_long);
352         else
353                 siz = NFS_MAXPACKET;
354         if (siz < nfs_soreserve)
355             siz = nfs_soreserve;
356
357         error = soreserve(so, siz, siz, NULL);
358         if (error) {
359                 if (mynam != NULL)
360                         FREE(mynam, M_SONAME);
361                 return (error);
362         }
363
364         /*
365          * Set protocol specific options { for now TCP only } and
366          * reserve some space. For datagram sockets, this can get called
367          * repeatedly for the same socket, but that isn't harmful.
368          */
369         if (so->so_type == SOCK_STREAM) {
370                 struct sockopt sopt;
371                 int val;
372
373                 bzero(&sopt, sizeof sopt);
374                 sopt.sopt_level = SOL_SOCKET;
375                 sopt.sopt_name = SO_KEEPALIVE;
376                 sopt.sopt_val = &val;
377                 sopt.sopt_valsize = sizeof val;
378                 val = 1;
379                 sosetopt(so, &sopt);
380         }
381         if (so->so_proto->pr_domain->dom_family == AF_INET &&
382             so->so_proto->pr_protocol == IPPROTO_TCP) {
383                 struct sockopt sopt;
384                 int val;
385
386                 bzero(&sopt, sizeof sopt);
387                 sopt.sopt_level = IPPROTO_TCP;
388                 sopt.sopt_name = TCP_NODELAY;
389                 sopt.sopt_val = &val;
390                 sopt.sopt_valsize = sizeof val;
391                 val = 1;
392                 sosetopt(so, &sopt);
393
394                 bzero(&sopt, sizeof sopt);
395                 sopt.sopt_level = IPPROTO_TCP;
396                 sopt.sopt_name = TCP_FASTKEEP;
397                 sopt.sopt_val = &val;
398                 sopt.sopt_valsize = sizeof val;
399                 val = 1;
400                 sosetopt(so, &sopt);
401         }
402         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
403         so->so_rcv.ssb_timeo = 0;
404         atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR);
405         so->so_snd.ssb_timeo = 0;
406
407         slp = kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
408         mtx_init(&slp->ns_solock);
409         STAILQ_INIT(&slp->ns_rec);
410         TAILQ_INIT(&slp->ns_uidlruhead);
411         lwkt_token_init(&slp->ns_token, 1, "nfssrv_token");
412
413         lwkt_gettoken(&nfs_token);
414         nfsrv_slpref(slp);
415         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
416         lwkt_gettoken(&slp->ns_token);
417
418         slp->ns_so = so;
419         slp->ns_nam = mynam;
420         fp->f_count++;
421         slp->ns_fp = fp;
422
423         so->so_upcallarg = (caddr_t)slp;
424         so->so_upcall = nfsrv_rcv_upcall;
425         atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
426         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
427         nfsrv_wakenfsd(slp, 1);
428
429         lwkt_reltoken(&slp->ns_token);
430         lwkt_reltoken(&nfs_token);
431
432         return (0);
433 }
434
435 /*
436  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
437  * until it is killed by a signal.
438  */
439 static int
440 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
441 {
442         int siz;
443         struct nfssvc_sock *slp;
444         struct nfsd *nfsd = nsd->nsd_nfsd;
445         struct nfsrv_descript *nd = NULL;
446         struct mbuf *m, *mreq;
447         int error, cacherep, sotype, writes_todo;
448         int procrastinate;
449         u_quad_t cur_usec;
450
451 #ifndef nolint
452         cacherep = RC_DOIT;
453         writes_todo = 0;
454 #endif
455         lwkt_gettoken(&nfs_token);
456
457         if (nfsd == NULL) {
458                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
459                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
460                 nfsd->nfsd_td = td;
461                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
462                 nfs_numnfsd++;
463         }
464
465         /*
466          * Loop getting rpc requests until SIGKILL.
467          */
468         for (;;) {
469                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
470                         while (nfsd->nfsd_slp == NULL &&
471                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
472                                 nfsd->nfsd_flag |= NFSD_WAITING;
473                                 nfsd_waiting++;
474                                 error = tsleep(nfsd, PCATCH, "nfsd", 0);
475                                 nfsd_waiting--;
476                                 if (error && nfsd->nfsd_slp == NULL)
477                                         goto done;
478                         }
479                         if (nfsd->nfsd_slp == NULL &&
480                             (nfsd_head_flag & NFSD_CHECKSLP)) {
481                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
482                                     if ((slp->ns_flag & SLP_ACTION_MASK) ||
483                                         slp->ns_needq_upcall) {
484                                             nfsrv_slpref(slp);
485                                             nfsd->nfsd_slp = slp;
486                                             break;
487                                     }
488                                 }
489                                 if (slp == NULL)
490                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
491                         }
492                         if ((slp = nfsd->nfsd_slp) == NULL)
493                                 continue;
494
495                         lwkt_reltoken(&nfs_token);
496                         lwkt_gettoken(&slp->ns_token);
497
498                         if (slp->ns_needq_upcall) {
499                                 slp->ns_needq_upcall = 0;
500                                 slp->ns_flag |= SLP_NEEDQ;
501                         }
502
503                         if (slp->ns_flag & SLP_VALID) {
504                                 /*
505                                  * We can both process additional received
506                                  * data into new records and process existing
507                                  * records.  This keeps the pipeline hot by
508                                  * allowing the tcp socket to continue to
509                                  * drain while we are processing records.
510                                  */
511                                 if (slp->ns_flag & SLP_DISCONN) {
512                                         nfsrv_zapsock(slp);
513                                 } else if (slp->ns_flag & SLP_NEEDQ) {
514                                         (void)nfs_slplock(slp, 1);
515                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
516                                                   MB_WAIT);
517                                         nfs_slpunlock(slp);
518                                 }
519                                 error = nfsrv_dorec(slp, nfsd, &nd);
520                                 cur_usec = nfs_curusec();
521                                 if (error && slp->ns_tq.lh_first &&
522                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
523                                         error = 0;
524                                         cacherep = RC_DOIT;
525                                         writes_todo = 1;
526                                 } else {
527                                         writes_todo = 0;
528                                 }
529                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
530                         } else {
531                                 slp->ns_flag &= ~SLP_ACTION_MASK;
532                                 error = 0;
533                         }
534                 } else {
535                         error = 0;
536                         slp = nfsd->nfsd_slp;
537
538                         lwkt_reltoken(&nfs_token);
539                         lwkt_gettoken(&slp->ns_token);
540
541                         if (slp->ns_needq_upcall) {
542                                 slp->ns_needq_upcall = 0;
543                                 slp->ns_flag |= SLP_NEEDQ;
544                         }
545                         if (NFSRV_RECLIMIT(slp) == 0 &&
546                             (slp->ns_flag & SLP_NEEDQ)) {
547                                 (void)nfs_slplock(slp, 1);
548                                 nfsrv_rcv(slp->ns_so, (caddr_t)slp,
549                                           MB_WAIT);
550                                 nfs_slpunlock(slp);
551                         }
552                 }
553
554                 /*
555                  * nfs_token not held here.  slp token is held.
556                  */
557                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
558                         if (nd) {
559                                 kfree((caddr_t)nd, M_NFSRVDESC);
560                                 nd = NULL;
561                         }
562                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
563                         if (slp->ns_flag & SLP_ACTION_MASK) {
564                                 lwkt_reltoken(&slp->ns_token);
565                                 lwkt_gettoken(&nfs_token);
566                         } else {
567                                 nfsd->nfsd_slp = NULL;
568                                 lwkt_reltoken(&slp->ns_token);
569                                 lwkt_gettoken(&nfs_token);
570                                 nfsrv_slpderef(slp);
571                         }
572                         continue;
573                 }
574
575                 /*
576                  * Execute the NFS request - handle the server side cache
577                  *
578                  * nfs_token not held here.  slp token is held.
579                  */
580                 sotype = slp->ns_so->so_type;
581                 if (nd) {
582                     getmicrotime(&nd->nd_starttime);
583                     if (nd->nd_nam2)
584                         nd->nd_nam = nd->nd_nam2;
585                     else
586                         nd->nd_nam = slp->ns_nam;
587
588                     /*
589                      * Check to see if authorization is needed.
590                      */
591                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
592                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
593                         nsd->nsd_haddr = 
594                                 ((struct sockaddr_in *)
595                                  nd->nd_nam)->sin_addr.s_addr;
596                         nsd->nsd_authlen = nfsd->nfsd_authlen;
597                         nsd->nsd_verflen = nfsd->nfsd_verflen;
598                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
599                                 nfsd->nfsd_authlen) &&
600                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
601                                 nfsd->nfsd_verflen) &&
602                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
603                             lwkt_reltoken(&slp->ns_token);
604                             return (ENEEDAUTH);
605                         cacherep = RC_DROPIT;
606                     } else {
607                         cacherep = nfsrv_getcache(nd, slp, &mreq);
608                     }
609
610                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
611                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
612                         nd->nd_procnum = NFSPROC_NOOP;
613                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
614                         cacherep = RC_DOIT;
615                     } else if (nfs_privport) {
616                         /* Check if source port is privileged */
617                         u_short port;
618                         struct sockaddr *nam = nd->nd_nam;
619                         struct sockaddr_in *sin;
620
621                         sin = (struct sockaddr_in *)nam;
622                         port = ntohs(sin->sin_port);
623                         if (port >= IPPORT_RESERVED && 
624                             nd->nd_procnum != NFSPROC_NULL) {
625                             nd->nd_procnum = NFSPROC_NOOP;
626                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
627                             cacherep = RC_DOIT;
628                             kprintf("NFS request from unprivileged port (%s:%d)\n",
629                                    inet_ntoa(sin->sin_addr), port);
630                         }
631                     }
632
633                 }
634
635                 /*
636                  * Execute the NFS request - direct execution
637                  *
638                  * Loop to get all the write rpc replies that have been
639                  * gathered together.
640                  *
641                  * nfs_token not held here.  slp token is held.
642                  */
643                 do {
644                     switch (cacherep) {
645                     case RC_DOIT:
646                         if (nd && (nd->nd_flag & ND_NFSV3))
647                             procrastinate = nfsrvw_procrastinate_v3;
648                         else
649                             procrastinate = nfsrvw_procrastinate;
650                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
651                             procrastinate > 0)
652                         ) {
653                             error = nfsrv_writegather(&nd, slp,
654                                                       nfsd->nfsd_td, &mreq);
655                         } else {
656                             /* NOT YET lwkt_reltoken(&slp->ns_token); */
657                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
658                                                 slp, nfsd->nfsd_td, &mreq);
659                             /* NOT YET lwkt_gettoken(&slp->ns_token); */
660                         }
661                         if (mreq == NULL)
662                                 break;
663                         if (error != 0 && error != NFSERR_RETVOID) {
664                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
665                                         nfsstats.srv_errs++;
666                                 nfsrv_updatecache(nd, FALSE, mreq);
667                                 if (nd->nd_nam2)
668                                         FREE(nd->nd_nam2, M_SONAME);
669                                 break;
670                         }
671                         nfsstats.srvrpccnt[nd->nd_procnum]++;
672                         nfsrv_updatecache(nd, TRUE, mreq);
673                         nd->nd_mrep = NULL;
674                         /* FALL THROUGH */
675                     case RC_REPLY:
676                         m = mreq;
677                         siz = 0;
678                         while (m) {
679                                 siz += m->m_len;
680                                 m = m->m_next;
681                         }
682                         if (siz <= 0 || siz > NFS_MAXPACKET) {
683                                 kprintf("mbuf siz=%d\n",siz);
684                                 panic("Bad nfs svc reply");
685                         }
686                         m = mreq;
687                         m->m_pkthdr.len = siz;
688                         m->m_pkthdr.rcvif = NULL;
689                         /*
690                          * For stream protocols, prepend a Sun RPC
691                          * Record Mark.
692                          */
693                         if (sotype == SOCK_STREAM) {
694                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
695                                 if (m == NULL) {
696                                         error = ENOBUFS;
697                                         goto skip;
698                                 }
699                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
700                         }
701                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
702                                 (void) nfs_slplock(slp, 1);
703                         if (slp->ns_flag & SLP_VALID)
704                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
705                         else {
706                             error = EPIPE;
707                             m_freem(m);
708                         }
709 skip:
710                         if (nfsrtton)
711                                 nfsd_rt(sotype, nd, cacherep);
712                         if (nd->nd_nam2)
713                                 FREE(nd->nd_nam2, M_SONAME);
714                         if (nd->nd_mrep)
715                                 m_freem(nd->nd_mrep);
716                         if (error == EPIPE || error == ENOBUFS)
717                                 nfsrv_zapsock(slp);
718                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
719                                 nfs_slpunlock(slp);
720                         if (error == EINTR || error == ERESTART) {
721                                 kfree((caddr_t)nd, M_NFSRVDESC);
722                                 lwkt_reltoken(&slp->ns_token);
723                                 lwkt_gettoken(&nfs_token);
724                                 nfsd->nfsd_slp = NULL;
725                                 nfsrv_slpderef(slp);
726                                 goto done;
727                         }
728                         break;
729                     case RC_DROPIT:
730                         if (nfsrtton)
731                                 nfsd_rt(sotype, nd, cacherep);
732                         m_freem(nd->nd_mrep);
733                         if (nd->nd_nam2)
734                                 FREE(nd->nd_nam2, M_SONAME);
735                         break;
736                     };
737                     if (nd) {
738                         FREE((caddr_t)nd, M_NFSRVDESC);
739                         nd = NULL;
740                     }
741
742                     /*
743                      * Check to see if there are outstanding writes that
744                      * need to be serviced.
745                      */
746                     cur_usec = nfs_curusec();
747                     if (slp->ns_tq.lh_first &&
748                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
749                         cacherep = RC_DOIT;
750                         writes_todo = 1;
751                     } else {
752                         writes_todo = 0;
753                     }
754                 } while (writes_todo);
755
756                 /*
757                  * nfs_token not held here.  slp token is held.
758                  */
759                 if (nfsrv_dorec(slp, nfsd, &nd)) {
760                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
761                         if (slp->ns_flag & SLP_ACTION_MASK) {
762                                 lwkt_reltoken(&slp->ns_token);
763                                 lwkt_gettoken(&nfs_token);
764                         } else {
765                                 nfsd->nfsd_slp = NULL;
766                                 lwkt_reltoken(&slp->ns_token);
767                                 lwkt_gettoken(&nfs_token);
768                                 nfsrv_slpderef(slp);
769                         }
770                 } else {
771                         lwkt_reltoken(&slp->ns_token);
772                         lwkt_gettoken(&nfs_token);
773                 }
774         }
775 done:
776         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
777         kfree((caddr_t)nfsd, M_NFSD);
778         nsd->nsd_nfsd = NULL;
779         if (--nfs_numnfsd == 0)
780                 nfsrv_init(TRUE);       /* Reinitialize everything */
781
782         lwkt_reltoken(&nfs_token);
783         return (error);
784 }
785
786 /*
787  * Shut down a socket associated with an nfssvc_sock structure.
788  * Should be called with the send lock set, if required.
789  * The trick here is to increment the sref at the start, so that the nfsds
790  * will stop using it and clear ns_flag at the end so that it will not be
791  * reassigned during cleanup.
792  */
793 static void
794 nfsrv_zapsock(struct nfssvc_sock *slp)
795 {
796         struct nfsuid *nuidp, *nnuidp;
797         struct nfsrv_descript *nwp, *nnwp;
798         struct socket *so;
799         struct file *fp;
800         struct nfsrv_rec *rec;
801
802         slp->ns_flag &= ~SLP_ALLFLAGS;
803         fp = slp->ns_fp;
804         if (fp) {
805                 slp->ns_fp = NULL;
806                 so = slp->ns_so;
807                 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
808                 so->so_upcall = NULL;
809                 so->so_upcallarg = NULL;
810                 soshutdown(so, SHUT_RDWR);
811                 closef(fp, NULL);
812                 if (slp->ns_nam)
813                         FREE(slp->ns_nam, M_SONAME);
814                 m_freem(slp->ns_raw);
815                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
816                         --slp->ns_numrec;
817                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
818                         if (rec->nr_address)
819                                 FREE(rec->nr_address, M_SONAME);
820                         m_freem(rec->nr_packet);
821                         kfree(rec, M_NFSRVDESC);
822                 }
823                 KKASSERT(slp->ns_numrec == 0);
824
825                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
826                                       nnuidp) {
827                         LIST_REMOVE(nuidp, nu_hash);
828                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
829                         if (nuidp->nu_flag & NU_NAM)
830                                 FREE(nuidp->nu_nam, M_SONAME);
831                         kfree((caddr_t)nuidp, M_NFSUID);
832                 }
833                 crit_enter();
834                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
835                         nnwp = nwp->nd_tq.le_next;
836                         LIST_REMOVE(nwp, nd_tq);
837                         kfree((caddr_t)nwp, M_NFSRVDESC);
838                 }
839                 LIST_INIT(&slp->ns_tq);
840                 crit_exit();
841                 nfsrv_slpderef(slp);
842         }
843 }
844
845 /*
846  * Derefence a server socket structure. If it has no more references and
847  * is no longer valid, you can throw it away.
848  *
849  * Must be holding nfs_token!
850  */
851 void
852 nfsrv_slpderef(struct nfssvc_sock *slp)
853 {
854         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
855         if (slp->ns_sref == 1) {
856                 KKASSERT((slp->ns_flag & SLP_VALID) == 0);
857                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
858                 slp->ns_sref = 0;
859                 kfree((caddr_t)slp, M_NFSSVC);
860         } else {
861                 --slp->ns_sref;
862         }
863 }
864
865 void
866 nfsrv_slpref(struct nfssvc_sock *slp)
867 {
868         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
869         ++slp->ns_sref;
870 }
871
872 /*
873  * Lock a socket against others.
874  *
875  * Returns 0 on failure, 1 on success.
876  */
877 int
878 nfs_slplock(struct nfssvc_sock *slp, int wait)
879 {
880         mtx_t mtx = &slp->ns_solock;
881
882         if (wait) {
883                 mtx_lock_ex(mtx, "nfsslplck", 0, 0);
884                 return(1);
885         } else if (mtx_lock_ex_try(mtx) == 0) {
886                 return(1);
887         } else {
888                 return(0);
889         }
890 }
891
892 /*
893  * Unlock the stream socket for others.
894  */
895 void
896 nfs_slpunlock(struct nfssvc_sock *slp)
897 {
898         mtx_t mtx = &slp->ns_solock;
899
900         mtx_unlock(mtx);
901 }
902
903 /*
904  * Initialize the data structures for the server.
905  * Handshake with any new nfsds starting up to avoid any chance of
906  * corruption.
907  */
908 void
909 nfsrv_init(int terminating)
910 {
911         struct nfssvc_sock *slp, *nslp;
912
913         lwkt_gettoken(&nfs_token);
914         if (nfssvc_sockhead_flag & SLP_INIT)
915                 panic("nfsd init");
916         nfssvc_sockhead_flag |= SLP_INIT;
917
918         if (terminating) {
919                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
920                         if (slp->ns_flag & SLP_VALID)
921                                 nfsrv_zapsock(slp);
922                         /*
923                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
924                         kfree((caddr_t)slp, M_NFSSVC);
925                         */
926                 }
927                 nfsrv_cleancache();     /* And clear out server cache */
928         } else {
929                 nfs_pub.np_valid = 0;
930         }
931
932         TAILQ_INIT(&nfssvc_sockhead);
933         nfssvc_sockhead_flag &= ~SLP_INIT;
934         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
935                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
936                 wakeup((caddr_t)&nfssvc_sockhead);
937         }
938
939         TAILQ_INIT(&nfsd_head);
940         nfsd_head_flag &= ~NFSD_CHECKSLP;
941
942         lwkt_reltoken(&nfs_token);
943
944 #if 0
945         nfs_udpsock = (struct nfssvc_sock *)
946             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
947         mtx_init(&nfs_udpsock->ns_solock);
948         STAILQ_INIT(&nfs_udpsock->ns_rec);
949         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
950         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
951
952         nfs_cltpsock = (struct nfssvc_sock *)
953             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
954         mtx_init(&nfs_cltpsock->ns_solock);
955         STAILQ_INIT(&nfs_cltpsock->ns_rec);
956         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
957         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
958 #endif
959 }
960
961 /*
962  * Add entries to the server monitor log.
963  */
964 static void
965 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
966 {
967         struct drt *rt;
968
969         rt = &nfsdrt.drt[nfsdrt.pos];
970         if (cacherep == RC_DOIT)
971                 rt->flag = 0;
972         else if (cacherep == RC_REPLY)
973                 rt->flag = DRT_CACHEREPLY;
974         else
975                 rt->flag = DRT_CACHEDROP;
976         if (sotype == SOCK_STREAM)
977                 rt->flag |= DRT_TCP;
978         if (nd->nd_flag & ND_NFSV3)
979                 rt->flag |= DRT_NFSV3;
980         rt->proc = nd->nd_procnum;
981         if (nd->nd_nam->sa_family == AF_INET)
982             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
983         else
984             rt->ipadr = INADDR_ANY;
985         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
986         getmicrotime(&rt->tstamp);
987         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
988 }
989 #endif /* NFS_NOSERVER */
990
991 static int nfs_defect = 0;
992 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
993
994 /*
995  * Get an authorization string for the uid by having the mount_nfs sitting
996  * on this mount point porpous out of the kernel and do it.
997  */
998 int
999 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
1000             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
1001             int *verf_len, NFSKERBKEY_T key /* return session key */)
1002 {
1003         int error = 0;
1004
1005         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
1006                 nmp->nm_state |= NFSSTA_WANTAUTH;
1007                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
1008                         "nfsauth1", 2 * hz);
1009                 error = nfs_sigintr(nmp, rep, rep->r_td);
1010                 if (error) {
1011                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
1012                         return (error);
1013                 }
1014         }
1015         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
1016         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
1017         nmp->nm_authlen = RPCAUTH_MAXSIZ;
1018         nmp->nm_verfstr = verf_str;
1019         nmp->nm_verflen = *verf_len;
1020         nmp->nm_authuid = cred->cr_uid;
1021         wakeup((caddr_t)&nmp->nm_authstr);
1022
1023         /*
1024          * And wait for mount_nfs to do its stuff.
1025          */
1026         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
1027                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
1028                         "nfsauth2", 2 * hz);
1029                 error = nfs_sigintr(nmp, rep, rep->r_td);
1030         }
1031         if (nmp->nm_state & NFSSTA_AUTHERR) {
1032                 nmp->nm_state &= ~NFSSTA_AUTHERR;
1033                 error = EAUTH;
1034         }
1035         if (error)
1036                 kfree((caddr_t)*auth_str, M_TEMP);
1037         else {
1038                 *auth_len = nmp->nm_authlen;
1039                 *verf_len = nmp->nm_verflen;
1040                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
1041         }
1042         nmp->nm_state &= ~NFSSTA_HASAUTH;
1043         nmp->nm_state |= NFSSTA_WAITAUTH;
1044         if (nmp->nm_state & NFSSTA_WANTAUTH) {
1045                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
1046                 wakeup((caddr_t)&nmp->nm_authtype);
1047         }
1048         return (error);
1049 }
1050
1051 /*
1052  * Get a nickname authenticator and verifier.
1053  */
1054 int
1055 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
1056                 int *auth_len, char *verf_str, int verf_len)
1057 {
1058         struct nfsuid *nuidp;
1059         u_int32_t *nickp, *verfp;
1060         struct timeval ktvin, ktvout;
1061
1062 #ifdef DIAGNOSTIC
1063         if (verf_len < (4 * NFSX_UNSIGNED))
1064                 panic("nfs_getnickauth verf too small");
1065 #endif
1066         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
1067             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1068                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
1069                         break;
1070         }
1071         if (!nuidp || nuidp->nu_expire < time_second)
1072                 return (EACCES);
1073
1074         /*
1075          * Move to the end of the lru list (end of lru == most recently used).
1076          */
1077         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1078         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
1079
1080         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
1081         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
1082         *nickp = txdr_unsigned(nuidp->nu_nickname);
1083         *auth_str = (char *)nickp;
1084         *auth_len = 2 * NFSX_UNSIGNED;
1085
1086         /*
1087          * Now we must encrypt the verifier and package it up.
1088          */
1089         verfp = (u_int32_t *)verf_str;
1090         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
1091         if (time_second > nuidp->nu_timestamp.tv_sec ||
1092             (time_second == nuidp->nu_timestamp.tv_sec &&
1093              time_second > nuidp->nu_timestamp.tv_usec))
1094                 getmicrotime(&nuidp->nu_timestamp);
1095         else
1096                 nuidp->nu_timestamp.tv_usec++;
1097         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
1098         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1099
1100         /*
1101          * Now encrypt the timestamp verifier in ecb mode using the session
1102          * key.
1103          */
1104 #ifdef NFSKERB
1105         XXX
1106 #else
1107         ktvout.tv_sec = 0;
1108         ktvout.tv_usec = 0;
1109 #endif
1110
1111         *verfp++ = ktvout.tv_sec;
1112         *verfp++ = ktvout.tv_usec;
1113         *verfp = 0;
1114         return (0);
1115 }
1116
1117 /*
1118  * Save the current nickname in a hash list entry on the mount point.
1119  */
1120 int
1121 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1122                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1123                  struct mbuf *mrep)
1124 {
1125         struct nfsuid *nuidp;
1126         u_int32_t *tl;
1127         struct timeval ktvin, ktvout;
1128         u_int32_t nick;
1129         int deltasec, error = 0;
1130         struct nfsm_info info;
1131
1132         info.md = *mdp;
1133         info.dpos = *dposp;
1134         info.mrep = mrep;
1135
1136         if (len == (3 * NFSX_UNSIGNED)) {
1137                 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
1138                 ktvin.tv_sec = *tl++;
1139                 ktvin.tv_usec = *tl++;
1140                 nick = fxdr_unsigned(u_int32_t, *tl);
1141
1142                 /*
1143                  * Decrypt the timestamp in ecb mode.
1144                  */
1145 #ifdef NFSKERB
1146                 XXX
1147 #else
1148                 ktvout.tv_sec = 0;
1149                 ktvout.tv_usec = 0;
1150 #endif
1151                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1152                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1153                 deltasec = time_second - ktvout.tv_sec;
1154                 if (deltasec < 0)
1155                         deltasec = -deltasec;
1156                 /*
1157                  * If ok, add it to the hash list for the mount point.
1158                  */
1159                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1160                         if (nmp->nm_numuids < nuidhash_max) {
1161                                 nmp->nm_numuids++;
1162                                 nuidp = (struct nfsuid *)
1163                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1164                                         M_WAITOK);
1165                         } else {
1166                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1167                                 LIST_REMOVE(nuidp, nu_hash);
1168                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1169                                         nu_lru);
1170                         }
1171                         nuidp->nu_flag = 0;
1172                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1173                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1174                         nuidp->nu_timestamp = ktvout;
1175                         nuidp->nu_nickname = nick;
1176                         bcopy(key, nuidp->nu_key, sizeof (key));
1177                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1178                                 nu_lru);
1179                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1180                                 nuidp, nu_hash);
1181                 }
1182         } else {
1183                 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
1184         }
1185 nfsmout:
1186         *mdp = info.md;
1187         *dposp = info.dpos;
1188         return (error);
1189 }