9fb0973be7da67bb443c4e8b6eba7f2d453e8ad6
[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  */
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sysproto.h>
43 #include <sys/kernel.h>
44 #include <sys/sysctl.h>
45 #include <sys/file.h>
46 #include <sys/filedesc.h>
47 #include <sys/vnode.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/proc.h>
51 #include <sys/priv.h>
52 #include <sys/buf.h>
53 #include <sys/mbuf.h>
54 #include <sys/resourcevar.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 #include <sys/domain.h>
58 #include <sys/protosw.h>
59 #include <sys/nlookup.h>
60
61 #include <sys/mutex2.h>
62 #include <sys/thread2.h>
63
64 #include <netinet/in.h>
65 #include <netinet/tcp.h>
66 #include "xdr_subs.h"
67 #include "rpcv2.h"
68 #include "nfsproto.h"
69 #include "nfs.h"
70 #include "nfsm_subs.h"
71 #include "nfsrvcache.h"
72 #include "nfsmount.h"
73 #include "nfsnode.h"
74 #include "nfsrtt.h"
75
76 #include <sys/thread2.h>
77
78 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
79
80 static int nuidhash_max = NFS_MAXUIDHASH;
81
82 #ifndef NFS_NOSERVER
83 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
84 #endif
85
86 #define TRUE    1
87 #define FALSE   0
88
89 SYSCTL_DECL(_vfs_nfs);
90
91 #ifndef NFS_NOSERVER
92 int nfsd_waiting = 0;
93 static struct nfsdrt nfsdrt;
94 static int nfs_numnfsd = 0;
95 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
96                              int cacherep);
97 static int      nfssvc_addsock (struct file *, struct sockaddr *,
98                                     struct thread *);
99 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
100
101 static int nfs_privport = 0;
102 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport,
103     0, "Enable privileged source port checks");
104 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0,
105     "Enable NFS request procrastination");
106 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0,
107     "Enable NFSv3 request procrastination");
108 int     nfs_soreserve = NFS_MAXPACKET * NFS_MAXASYNCBIO;
109 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0,
110     "Minimum NFS socket buffer size reservation");
111
112 /*
113  * NFS server system calls
114  */
115
116 #endif /* NFS_NOSERVER */
117 /*
118  * nfssvc_args(int flag, caddr_t argp)
119  *
120  * Nfs server psuedo system call for the nfsd's
121  * Based on the flag value it either:
122  * - adds a socket to the selection list
123  * - remains in the kernel as an nfsd
124  * - remains in the kernel as an nfsiod
125  *
126  * MPALMOSTSAFE
127  */
128 int
129 sys_nfssvc(struct nfssvc_args *uap)
130 {
131 #ifndef NFS_NOSERVER
132         struct nlookupdata nd;
133         struct file *fp;
134         struct sockaddr *nam;
135         struct nfsd_args nfsdarg;
136         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
137         struct nfsd_cargs ncd;
138         struct nfsd *nfsd;
139         struct nfssvc_sock *slp;
140         struct nfsuid *nuidp;
141         struct nfsmount *nmp;
142         struct vnode *vp;
143 #endif /* NFS_NOSERVER */
144         int error;
145         struct thread *td = curthread;
146
147         /*
148          * Must be super user
149          */
150         error = priv_check(td, PRIV_ROOT);
151         if (error)
152                 return (error);
153
154         lwkt_gettoken(&nfs_token);
155
156         while (nfssvc_sockhead_flag & SLP_INIT) {
157                 nfssvc_sockhead_flag |= SLP_WANTINIT;
158                 tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
159         }
160         if (uap->flag & NFSSVC_BIOD)
161                 error = ENXIO;          /* no longer need nfsiod's */
162 #ifdef NFS_NOSERVER
163         else
164                 error = ENXIO;
165 #else /* !NFS_NOSERVER */
166         else if (uap->flag & NFSSVC_MNTD) {
167                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
168                 if (error)
169                         goto done;
170                 vp = NULL;
171                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE, 
172                                         NLC_FOLLOW);
173                 if (error == 0)
174                         error = nlookup(&nd);
175                 if (error == 0)
176                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);   
177                 nlookup_done(&nd);
178                 if (error)
179                         goto done;
180
181                 if ((vp->v_flag & VROOT) == 0)
182                         error = EINVAL;
183                 nmp = VFSTONFS(vp->v_mount);
184                 vput(vp);
185                 if (error)
186                         goto done;
187                 if ((nmp->nm_state & NFSSTA_MNTD) &&
188                         (uap->flag & NFSSVC_GOTAUTH) == 0) {
189                         error = 0;
190                         goto done;
191                 }
192                 nmp->nm_state |= NFSSTA_MNTD;
193                 error = nfs_clientd(nmp, td->td_ucred, &ncd, uap->flag,
194                                     uap->argp, td);
195         } else if (uap->flag & NFSSVC_ADDSOCK) {
196                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
197                 if (error)
198                         goto done;
199                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
200                 if (error)
201                         goto done;
202                 /*
203                  * Get the client address for connected sockets.
204                  */
205                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
206                         nam = NULL;
207                 else {
208                         error = getsockaddr(&nam, nfsdarg.name,
209                                             nfsdarg.namelen);
210                         if (error) {
211                                 fdrop(fp);
212                                 goto done;
213                         }
214                 }
215                 error = nfssvc_addsock(fp, nam, td);
216                 fdrop(fp);
217         } else {
218                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
219                 if (error)
220                         goto done;
221                 if ((uap->flag & NFSSVC_AUTHIN) &&
222                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
223                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
224                         slp = nfsd->nfsd_slp;
225
226                         /*
227                          * First check to see if another nfsd has already
228                          * added this credential.
229                          */
230                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
231                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
232                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
233                                     (!nfsd->nfsd_nd->nd_nam2 ||
234                                      netaddr_match(NU_NETFAM(nuidp),
235                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
236                                         break;
237                         }
238                         if (nuidp) {
239                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
240                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
241                         } else {
242                             /*
243                              * Nope, so we will.
244                              */
245                             if (slp->ns_numuids < nuidhash_max) {
246                                 slp->ns_numuids++;
247                                 nuidp = (struct nfsuid *)
248                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
249                                         M_WAITOK);
250                             } else
251                                 nuidp = NULL;
252                             if ((slp->ns_flag & SLP_VALID) == 0) {
253                                 if (nuidp)
254                                     kfree((caddr_t)nuidp, M_NFSUID);
255                             } else {
256                                 if (nuidp == NULL) {
257                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
258                                     LIST_REMOVE(nuidp, nu_hash);
259                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
260                                         nu_lru);
261                                     if (nuidp->nu_flag & NU_NAM)
262                                         kfree(nuidp->nu_nam, M_SONAME);
263                                 }
264                                 nuidp->nu_flag = 0;
265                                 nuidp->nu_cr = nsd->nsd_cr;
266                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
267                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
268                                 nuidp->nu_cr.cr_ref = 1;
269                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
270                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
271                                 /*
272                                  * and save the session key in nu_key.
273                                  */
274                                 bcopy(nsd->nsd_key, nuidp->nu_key,
275                                     sizeof (nsd->nsd_key));
276                                 if (nfsd->nfsd_nd->nd_nam2) {
277                                     struct sockaddr_in *saddr;
278
279                                     saddr = (struct sockaddr_in *)
280                                             nfsd->nfsd_nd->nd_nam2;
281                                     switch (saddr->sin_family) {
282                                     case AF_INET:
283                                         nuidp->nu_flag |= NU_INETADDR;
284                                         nuidp->nu_inetaddr =
285                                              saddr->sin_addr.s_addr;
286                                         break;
287                                     case AF_ISO:
288                                     default:
289                                         nuidp->nu_flag |= NU_NAM;
290                                         nuidp->nu_nam = 
291                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
292                                         break;
293                                     };
294                                 }
295                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
296                                         nu_lru);
297                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
298                                         nuidp, nu_hash);
299                                 nfsrv_setcred(&nuidp->nu_cr,
300                                     &nfsd->nfsd_nd->nd_cr);
301                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
302                             }
303                         }
304                 }
305                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
306                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
307                 error = nfssvc_nfsd(nsd, uap->argp, td);
308         }
309 #endif /* NFS_NOSERVER */
310         if (error == EINTR || error == ERESTART)
311                 error = 0;
312 done:
313         lwkt_reltoken(&nfs_token);
314         return (error);
315 }
316
317 #ifndef NFS_NOSERVER
318 /*
319  * Adds a socket to the list for servicing by nfsds.
320  */
321 static int
322 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
323 {
324         int siz;
325         struct nfssvc_sock *slp;
326         struct socket *so;
327         int error;
328
329         so = (struct socket *)fp->f_data;
330 #if 0
331         tslp = NULL;
332         /*
333          * Add it to the list, as required.
334          */
335         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
336                 tslp = nfs_udpsock;
337                 if (tslp->ns_flag & SLP_VALID) {
338                         if (mynam != NULL)
339                                 kfree(mynam, M_SONAME);
340                         return (EPERM);
341                 }
342         }
343 #endif
344         /*
345          * Reserve buffer space in the socket.  Note that due to bugs in
346          * Linux's delayed-ack code, serious performance degredation may
347          * occur with linux hosts if the minimum is used.
348          *
349          * NFS sockets are not limited to the standard sb_max or by
350          * resource limits.
351          */
352         if (so->so_type == SOCK_STREAM)
353                 siz = NFS_MAXPACKET + sizeof (u_long);
354         else
355                 siz = NFS_MAXPACKET;
356         if (siz < nfs_soreserve)
357             siz = nfs_soreserve;
358
359         error = soreserve(so, siz, siz, NULL);
360         if (error) {
361                 if (mynam != NULL)
362                         kfree(mynam, M_SONAME);
363                 return (error);
364         }
365
366         /*
367          * Set protocol specific options { for now TCP only } and
368          * reserve some space. For datagram sockets, this can get called
369          * repeatedly for the same socket, but that isn't harmful.
370          */
371         if (so->so_type == SOCK_STREAM) {
372                 struct sockopt sopt;
373                 int val;
374
375                 bzero(&sopt, sizeof sopt);
376                 sopt.sopt_level = SOL_SOCKET;
377                 sopt.sopt_name = SO_KEEPALIVE;
378                 sopt.sopt_val = &val;
379                 sopt.sopt_valsize = sizeof val;
380                 val = 1;
381                 sosetopt(so, &sopt);
382         }
383         if (so->so_proto->pr_domain->dom_family == AF_INET &&
384             so->so_proto->pr_protocol == IPPROTO_TCP) {
385                 struct sockopt sopt;
386                 int val;
387
388                 bzero(&sopt, sizeof sopt);
389                 sopt.sopt_level = IPPROTO_TCP;
390                 sopt.sopt_name = TCP_NODELAY;
391                 sopt.sopt_val = &val;
392                 sopt.sopt_valsize = sizeof val;
393                 val = 1;
394                 sosetopt(so, &sopt);
395
396                 bzero(&sopt, sizeof sopt);
397                 sopt.sopt_level = IPPROTO_TCP;
398                 sopt.sopt_name = TCP_FASTKEEP;
399                 sopt.sopt_val = &val;
400                 sopt.sopt_valsize = sizeof val;
401                 val = 1;
402                 sosetopt(so, &sopt);
403         }
404         atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR);
405         so->so_rcv.ssb_timeo = 0;
406         atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR);
407         so->so_snd.ssb_timeo = 0;
408
409         slp = kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
410         mtx_init(&slp->ns_solock);
411         STAILQ_INIT(&slp->ns_rec);
412         TAILQ_INIT(&slp->ns_uidlruhead);
413         lwkt_token_init(&slp->ns_token, "nfssrv_token");
414
415         lwkt_gettoken(&nfs_token);
416         nfsrv_slpref(slp);
417         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
418         lwkt_gettoken(&slp->ns_token);
419
420         slp->ns_so = so;
421         slp->ns_nam = mynam;
422         fp->f_count++;
423         slp->ns_fp = fp;
424
425         so->so_upcallarg = (caddr_t)slp;
426         so->so_upcall = nfsrv_rcv_upcall;
427         atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
428         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
429         nfsrv_wakenfsd(slp, 1);
430
431         lwkt_reltoken(&slp->ns_token);
432         lwkt_reltoken(&nfs_token);
433
434         return (0);
435 }
436
437 /*
438  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
439  * until it is killed by a signal.
440  */
441 static int
442 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
443 {
444         int siz;
445         struct nfssvc_sock *slp;
446         struct nfsd *nfsd = nsd->nsd_nfsd;
447         struct nfsrv_descript *nd = NULL;
448         struct mbuf *m, *mreq;
449         int error, cacherep, sotype, writes_todo;
450         int procrastinate;
451         u_quad_t cur_usec;
452
453 #ifndef nolint
454         cacherep = RC_DOIT;
455         writes_todo = 0;
456 #endif
457         lwkt_gettoken(&nfs_token);
458
459         if (nfsd == NULL) {
460                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
461                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
462                 nfsd->nfsd_td = td;
463                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
464                 nfs_numnfsd++;
465         }
466
467         /*
468          * Loop getting rpc requests until SIGKILL.
469          */
470         for (;;) {
471                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
472                         while (nfsd->nfsd_slp == NULL &&
473                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
474                                 nfsd->nfsd_flag |= NFSD_WAITING;
475                                 nfsd_waiting++;
476                                 error = tsleep(nfsd, PCATCH, "nfsd", 0);
477                                 nfsd_waiting--;
478                                 if (error && nfsd->nfsd_slp == NULL)
479                                         goto done;
480                         }
481                         if (nfsd->nfsd_slp == NULL &&
482                             (nfsd_head_flag & NFSD_CHECKSLP)) {
483                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
484                                     if ((slp->ns_flag & SLP_ACTION_MASK) ||
485                                         slp->ns_needq_upcall) {
486                                             nfsrv_slpref(slp);
487                                             nfsd->nfsd_slp = slp;
488                                             break;
489                                     }
490                                 }
491                                 if (slp == NULL)
492                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
493                         }
494                         if ((slp = nfsd->nfsd_slp) == NULL)
495                                 continue;
496
497                         lwkt_reltoken(&nfs_token);
498                         lwkt_gettoken(&slp->ns_token);
499
500                         if (slp->ns_needq_upcall) {
501                                 slp->ns_needq_upcall = 0;
502                                 slp->ns_flag |= SLP_NEEDQ;
503                         }
504
505                         if (slp->ns_flag & SLP_VALID) {
506                                 /*
507                                  * We can both process additional received
508                                  * data into new records and process existing
509                                  * records.  This keeps the pipeline hot by
510                                  * allowing the tcp socket to continue to
511                                  * drain while we are processing records.
512                                  */
513                                 if (slp->ns_flag & SLP_DISCONN) {
514                                         nfsrv_zapsock(slp);
515                                 } else if (slp->ns_flag & SLP_NEEDQ) {
516                                         (void)nfs_slplock(slp, 1);
517                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
518                                                   MB_WAIT);
519                                         nfs_slpunlock(slp);
520                                 }
521                                 error = nfsrv_dorec(slp, nfsd, &nd);
522                                 cur_usec = nfs_curusec();
523                                 if (error && slp->ns_tq.lh_first &&
524                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
525                                         error = 0;
526                                         cacherep = RC_DOIT;
527                                         writes_todo = 1;
528                                 } else {
529                                         writes_todo = 0;
530                                 }
531                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
532                         } else {
533                                 slp->ns_flag &= ~SLP_ACTION_MASK;
534                                 error = 0;
535                         }
536                 } else {
537                         error = 0;
538                         slp = nfsd->nfsd_slp;
539
540                         lwkt_reltoken(&nfs_token);
541                         lwkt_gettoken(&slp->ns_token);
542
543                         if (slp->ns_needq_upcall) {
544                                 slp->ns_needq_upcall = 0;
545                                 slp->ns_flag |= SLP_NEEDQ;
546                         }
547                         if (NFSRV_RECLIMIT(slp) == 0 &&
548                             (slp->ns_flag & SLP_NEEDQ)) {
549                                 (void)nfs_slplock(slp, 1);
550                                 nfsrv_rcv(slp->ns_so, (caddr_t)slp,
551                                           MB_WAIT);
552                                 nfs_slpunlock(slp);
553                         }
554                 }
555
556                 /*
557                  * nfs_token not held here.  slp token is held.
558                  */
559                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
560                         if (nd) {
561                                 kfree((caddr_t)nd, M_NFSRVDESC);
562                                 nd = NULL;
563                         }
564                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
565                         if (slp->ns_flag & SLP_ACTION_MASK) {
566                                 lwkt_reltoken(&slp->ns_token);
567                                 lwkt_gettoken(&nfs_token);
568                         } else {
569                                 nfsd->nfsd_slp = NULL;
570                                 lwkt_reltoken(&slp->ns_token);
571                                 lwkt_gettoken(&nfs_token);
572                                 nfsrv_slpderef(slp);
573                         }
574                         continue;
575                 }
576
577                 /*
578                  * Execute the NFS request - handle the server side cache
579                  *
580                  * nfs_token not held here.  slp token is held.
581                  */
582                 sotype = slp->ns_so->so_type;
583                 if (nd) {
584                     getmicrotime(&nd->nd_starttime);
585                     if (nd->nd_nam2)
586                         nd->nd_nam = nd->nd_nam2;
587                     else
588                         nd->nd_nam = slp->ns_nam;
589
590                     /*
591                      * Check to see if authorization is needed.
592                      */
593                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
594                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
595                         nsd->nsd_haddr = 
596                                 ((struct sockaddr_in *)
597                                  nd->nd_nam)->sin_addr.s_addr;
598                         nsd->nsd_authlen = nfsd->nfsd_authlen;
599                         nsd->nsd_verflen = nfsd->nfsd_verflen;
600                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
601                                 nfsd->nfsd_authlen) &&
602                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
603                                 nfsd->nfsd_verflen) &&
604                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
605                             lwkt_reltoken(&slp->ns_token);
606                             return (ENEEDAUTH);
607                         cacherep = RC_DROPIT;
608                     } else {
609                         cacherep = nfsrv_getcache(nd, slp, &mreq);
610                     }
611
612                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
613                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
614                         nd->nd_procnum = NFSPROC_NOOP;
615                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
616                         cacherep = RC_DOIT;
617                     } else if (nfs_privport) {
618                         /* Check if source port is privileged */
619                         u_short port;
620                         struct sockaddr *nam = nd->nd_nam;
621                         struct sockaddr_in *sin;
622
623                         sin = (struct sockaddr_in *)nam;
624                         port = ntohs(sin->sin_port);
625                         if (port >= IPPORT_RESERVED && 
626                             nd->nd_procnum != NFSPROC_NULL) {
627                             nd->nd_procnum = NFSPROC_NOOP;
628                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
629                             cacherep = RC_DOIT;
630                             kprintf("NFS request from unprivileged port (%s:%d)\n",
631                                    inet_ntoa(sin->sin_addr), port);
632                         }
633                     }
634
635                 }
636
637                 /*
638                  * Execute the NFS request - direct execution
639                  *
640                  * Loop to get all the write rpc replies that have been
641                  * gathered together.
642                  *
643                  * nfs_token not held here.  slp token is held.
644                  */
645                 do {
646                     switch (cacherep) {
647                     case RC_DOIT:
648                         if (nd && (nd->nd_flag & ND_NFSV3))
649                             procrastinate = nfsrvw_procrastinate_v3;
650                         else
651                             procrastinate = nfsrvw_procrastinate;
652                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
653                             procrastinate > 0)
654                         ) {
655                             error = nfsrv_writegather(&nd, slp,
656                                                       nfsd->nfsd_td, &mreq);
657                         } else {
658                             /* NOT YET lwkt_reltoken(&slp->ns_token); */
659                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
660                                                 slp, nfsd->nfsd_td, &mreq);
661                             /* NOT YET lwkt_gettoken(&slp->ns_token); */
662                         }
663                         if (mreq == NULL)
664                                 break;
665                         if (error != 0 && error != NFSERR_RETVOID) {
666                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
667                                         nfsstats.srv_errs++;
668                                 nfsrv_updatecache(nd, FALSE, mreq);
669                                 if (nd->nd_nam2)
670                                         kfree(nd->nd_nam2, M_SONAME);
671                                 break;
672                         }
673                         nfsstats.srvrpccnt[nd->nd_procnum]++;
674                         nfsrv_updatecache(nd, TRUE, mreq);
675                         nd->nd_mrep = NULL;
676                         /* FALL THROUGH */
677                     case RC_REPLY:
678                         m = mreq;
679                         siz = 0;
680                         while (m) {
681                                 siz += m->m_len;
682                                 m = m->m_next;
683                         }
684                         if (siz <= 0 || siz > NFS_MAXPACKET) {
685                                 kprintf("mbuf siz=%d\n",siz);
686                                 panic("Bad nfs svc reply");
687                         }
688                         m = mreq;
689                         m->m_pkthdr.len = siz;
690                         m->m_pkthdr.rcvif = NULL;
691                         /*
692                          * For stream protocols, prepend a Sun RPC
693                          * Record Mark.
694                          */
695                         if (sotype == SOCK_STREAM) {
696                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
697                                 if (m == NULL) {
698                                         error = ENOBUFS;
699                                         goto skip;
700                                 }
701                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
702                         }
703                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
704                                 (void) nfs_slplock(slp, 1);
705                         if (slp->ns_flag & SLP_VALID)
706                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
707                         else {
708                             error = EPIPE;
709                             m_freem(m);
710                         }
711 skip:
712                         if (nfsrtton)
713                                 nfsd_rt(sotype, nd, cacherep);
714                         if (nd->nd_nam2)
715                                 kfree(nd->nd_nam2, M_SONAME);
716                         if (nd->nd_mrep)
717                                 m_freem(nd->nd_mrep);
718                         if (error == EPIPE || error == ENOBUFS)
719                                 nfsrv_zapsock(slp);
720                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
721                                 nfs_slpunlock(slp);
722                         if (error == EINTR || error == ERESTART) {
723                                 kfree((caddr_t)nd, M_NFSRVDESC);
724                                 lwkt_reltoken(&slp->ns_token);
725                                 lwkt_gettoken(&nfs_token);
726                                 nfsd->nfsd_slp = NULL;
727                                 nfsrv_slpderef(slp);
728                                 goto done;
729                         }
730                         break;
731                     case RC_DROPIT:
732                         if (nfsrtton)
733                                 nfsd_rt(sotype, nd, cacherep);
734                         m_freem(nd->nd_mrep);
735                         if (nd->nd_nam2)
736                                 kfree(nd->nd_nam2, M_SONAME);
737                         break;
738                     };
739                     if (nd) {
740                         kfree((caddr_t)nd, M_NFSRVDESC);
741                         nd = NULL;
742                     }
743
744                     /*
745                      * Check to see if there are outstanding writes that
746                      * need to be serviced.
747                      */
748                     cur_usec = nfs_curusec();
749                     if (slp->ns_tq.lh_first &&
750                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
751                         cacherep = RC_DOIT;
752                         writes_todo = 1;
753                     } else {
754                         writes_todo = 0;
755                     }
756                 } while (writes_todo);
757
758                 /*
759                  * nfs_token not held here.  slp token is held.
760                  */
761                 if (nfsrv_dorec(slp, nfsd, &nd)) {
762                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
763                         if (slp->ns_flag & SLP_ACTION_MASK) {
764                                 lwkt_reltoken(&slp->ns_token);
765                                 lwkt_gettoken(&nfs_token);
766                         } else {
767                                 nfsd->nfsd_slp = NULL;
768                                 lwkt_reltoken(&slp->ns_token);
769                                 lwkt_gettoken(&nfs_token);
770                                 nfsrv_slpderef(slp);
771                         }
772                 } else {
773                         lwkt_reltoken(&slp->ns_token);
774                         lwkt_gettoken(&nfs_token);
775                 }
776         }
777 done:
778         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
779         kfree((caddr_t)nfsd, M_NFSD);
780         nsd->nsd_nfsd = NULL;
781         if (--nfs_numnfsd == 0)
782                 nfsrv_init(TRUE);       /* Reinitialize everything */
783
784         lwkt_reltoken(&nfs_token);
785         return (error);
786 }
787
788 /*
789  * Shut down a socket associated with an nfssvc_sock structure.
790  * Should be called with the send lock set, if required.
791  * The trick here is to increment the sref at the start, so that the nfsds
792  * will stop using it and clear ns_flag at the end so that it will not be
793  * reassigned during cleanup.
794  */
795 static void
796 nfsrv_zapsock(struct nfssvc_sock *slp)
797 {
798         struct nfsuid *nuidp, *nnuidp;
799         struct nfsrv_descript *nwp, *nnwp;
800         struct socket *so;
801         struct file *fp;
802         struct nfsrv_rec *rec;
803
804         slp->ns_flag &= ~SLP_ALLFLAGS;
805         fp = slp->ns_fp;
806         if (fp) {
807                 slp->ns_fp = NULL;
808                 so = slp->ns_so;
809                 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_UPCALL);
810                 so->so_upcall = NULL;
811                 so->so_upcallarg = NULL;
812                 soshutdown(so, SHUT_RDWR);
813                 closef(fp, NULL);
814                 if (slp->ns_nam)
815                         kfree(slp->ns_nam, M_SONAME);
816                 m_freem(slp->ns_raw);
817                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
818                         --slp->ns_numrec;
819                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
820                         if (rec->nr_address)
821                                 kfree(rec->nr_address, M_SONAME);
822                         m_freem(rec->nr_packet);
823                         kfree(rec, M_NFSRVDESC);
824                 }
825                 KKASSERT(slp->ns_numrec == 0);
826
827                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
828                                       nnuidp) {
829                         LIST_REMOVE(nuidp, nu_hash);
830                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
831                         if (nuidp->nu_flag & NU_NAM)
832                                 kfree(nuidp->nu_nam, M_SONAME);
833                         kfree((caddr_t)nuidp, M_NFSUID);
834                 }
835                 crit_enter();
836                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
837                         nnwp = nwp->nd_tq.le_next;
838                         LIST_REMOVE(nwp, nd_tq);
839                         kfree((caddr_t)nwp, M_NFSRVDESC);
840                 }
841                 LIST_INIT(&slp->ns_tq);
842                 crit_exit();
843                 nfsrv_slpderef(slp);
844         }
845 }
846
847 /*
848  * Derefence a server socket structure. If it has no more references and
849  * is no longer valid, you can throw it away.
850  *
851  * Must be holding nfs_token!
852  */
853 void
854 nfsrv_slpderef(struct nfssvc_sock *slp)
855 {
856         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
857         if (slp->ns_sref == 1) {
858                 KKASSERT((slp->ns_flag & SLP_VALID) == 0);
859                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
860                 slp->ns_sref = 0;
861                 kfree((caddr_t)slp, M_NFSSVC);
862         } else {
863                 --slp->ns_sref;
864         }
865 }
866
867 void
868 nfsrv_slpref(struct nfssvc_sock *slp)
869 {
870         ASSERT_LWKT_TOKEN_HELD(&nfs_token);
871         ++slp->ns_sref;
872 }
873
874 /*
875  * Lock a socket against others.
876  *
877  * Returns 0 on failure, 1 on success.
878  */
879 int
880 nfs_slplock(struct nfssvc_sock *slp, int wait)
881 {
882         mtx_t mtx = &slp->ns_solock;
883
884         if (wait) {
885                 mtx_lock_ex(mtx, "nfsslplck", 0, 0);
886                 return(1);
887         } else if (mtx_lock_ex_try(mtx) == 0) {
888                 return(1);
889         } else {
890                 return(0);
891         }
892 }
893
894 /*
895  * Unlock the stream socket for others.
896  */
897 void
898 nfs_slpunlock(struct nfssvc_sock *slp)
899 {
900         mtx_t mtx = &slp->ns_solock;
901
902         mtx_unlock(mtx);
903 }
904
905 /*
906  * Initialize the data structures for the server.
907  * Handshake with any new nfsds starting up to avoid any chance of
908  * corruption.
909  */
910 void
911 nfsrv_init(int terminating)
912 {
913         struct nfssvc_sock *slp, *nslp;
914
915         lwkt_gettoken(&nfs_token);
916         if (nfssvc_sockhead_flag & SLP_INIT)
917                 panic("nfsd init");
918         nfssvc_sockhead_flag |= SLP_INIT;
919
920         if (terminating) {
921                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
922                         if (slp->ns_flag & SLP_VALID)
923                                 nfsrv_zapsock(slp);
924                         /*
925                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
926                         kfree((caddr_t)slp, M_NFSSVC);
927                         */
928                 }
929                 nfsrv_cleancache();     /* And clear out server cache */
930         } else {
931                 nfs_pub.np_valid = 0;
932         }
933
934         TAILQ_INIT(&nfssvc_sockhead);
935         nfssvc_sockhead_flag &= ~SLP_INIT;
936         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
937                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
938                 wakeup((caddr_t)&nfssvc_sockhead);
939         }
940
941         TAILQ_INIT(&nfsd_head);
942         nfsd_head_flag &= ~NFSD_CHECKSLP;
943
944         lwkt_reltoken(&nfs_token);
945
946 #if 0
947         nfs_udpsock = (struct nfssvc_sock *)
948             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
949         mtx_init(&nfs_udpsock->ns_solock);
950         STAILQ_INIT(&nfs_udpsock->ns_rec);
951         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
952         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
953
954         nfs_cltpsock = (struct nfssvc_sock *)
955             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
956         mtx_init(&nfs_cltpsock->ns_solock);
957         STAILQ_INIT(&nfs_cltpsock->ns_rec);
958         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
959         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
960 #endif
961 }
962
963 /*
964  * Add entries to the server monitor log.
965  */
966 static void
967 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
968 {
969         struct drt *rt;
970
971         rt = &nfsdrt.drt[nfsdrt.pos];
972         if (cacherep == RC_DOIT)
973                 rt->flag = 0;
974         else if (cacherep == RC_REPLY)
975                 rt->flag = DRT_CACHEREPLY;
976         else
977                 rt->flag = DRT_CACHEDROP;
978         if (sotype == SOCK_STREAM)
979                 rt->flag |= DRT_TCP;
980         if (nd->nd_flag & ND_NFSV3)
981                 rt->flag |= DRT_NFSV3;
982         rt->proc = nd->nd_procnum;
983         if (nd->nd_nam->sa_family == AF_INET)
984             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
985         else
986             rt->ipadr = INADDR_ANY;
987         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
988         getmicrotime(&rt->tstamp);
989         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
990 }
991 #endif /* NFS_NOSERVER */
992
993 /*
994  * Get an authorization string for the uid by having the mount_nfs sitting
995  * on this mount point porpous out of the kernel and do it.
996  */
997 int
998 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
999             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
1000             int *verf_len, NFSKERBKEY_T key /* return session key */)
1001 {
1002         int error = 0;
1003
1004         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
1005                 nmp->nm_state |= NFSSTA_WANTAUTH;
1006                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
1007                         "nfsauth1", 2 * hz);
1008                 error = nfs_sigintr(nmp, rep, rep->r_td);
1009                 if (error) {
1010                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
1011                         return (error);
1012                 }
1013         }
1014         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
1015         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
1016         nmp->nm_authlen = RPCAUTH_MAXSIZ;
1017         nmp->nm_verfstr = verf_str;
1018         nmp->nm_verflen = *verf_len;
1019         nmp->nm_authuid = cred->cr_uid;
1020         wakeup((caddr_t)&nmp->nm_authstr);
1021
1022         /*
1023          * And wait for mount_nfs to do its stuff.
1024          */
1025         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
1026                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
1027                         "nfsauth2", 2 * hz);
1028                 error = nfs_sigintr(nmp, rep, rep->r_td);
1029         }
1030         if (nmp->nm_state & NFSSTA_AUTHERR) {
1031                 nmp->nm_state &= ~NFSSTA_AUTHERR;
1032                 error = EAUTH;
1033         }
1034         if (error)
1035                 kfree((caddr_t)*auth_str, M_TEMP);
1036         else {
1037                 *auth_len = nmp->nm_authlen;
1038                 *verf_len = nmp->nm_verflen;
1039                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (NFSKERBKEY_T));
1040         }
1041         nmp->nm_state &= ~NFSSTA_HASAUTH;
1042         nmp->nm_state |= NFSSTA_WAITAUTH;
1043         if (nmp->nm_state & NFSSTA_WANTAUTH) {
1044                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
1045                 wakeup((caddr_t)&nmp->nm_authtype);
1046         }
1047         return (error);
1048 }
1049
1050 /*
1051  * Get a nickname authenticator and verifier.
1052  */
1053 int
1054 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
1055                 int *auth_len, char *verf_str, int verf_len)
1056 {
1057         struct nfsuid *nuidp;
1058         u_int32_t *nickp, *verfp;
1059         struct timeval ktvin, ktvout;
1060
1061 #ifdef DIAGNOSTIC
1062         if (verf_len < (4 * NFSX_UNSIGNED))
1063                 panic("nfs_getnickauth verf too small");
1064 #endif
1065         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
1066             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1067                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
1068                         break;
1069         }
1070         if (!nuidp || nuidp->nu_expire < time_second)
1071                 return (EACCES);
1072
1073         /*
1074          * Move to the end of the lru list (end of lru == most recently used).
1075          */
1076         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1077         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
1078
1079         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
1080         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
1081         *nickp = txdr_unsigned(nuidp->nu_nickname);
1082         *auth_str = (char *)nickp;
1083         *auth_len = 2 * NFSX_UNSIGNED;
1084
1085         /*
1086          * Now we must encrypt the verifier and package it up.
1087          */
1088         verfp = (u_int32_t *)verf_str;
1089         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
1090         if (time_second > nuidp->nu_timestamp.tv_sec ||
1091             (time_second == nuidp->nu_timestamp.tv_sec &&
1092              time_second > nuidp->nu_timestamp.tv_usec))
1093                 getmicrotime(&nuidp->nu_timestamp);
1094         else
1095                 nuidp->nu_timestamp.tv_usec++;
1096         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
1097         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1098
1099         /*
1100          * Now encrypt the timestamp verifier in ecb mode using the session
1101          * key.
1102          */
1103 #ifdef NFSKERB
1104         XXX
1105 #else
1106         ktvout.tv_sec = 0;
1107         ktvout.tv_usec = 0;
1108 #endif
1109
1110         *verfp++ = ktvout.tv_sec;
1111         *verfp++ = ktvout.tv_usec;
1112         *verfp = 0;
1113         return (0);
1114 }
1115
1116 /*
1117  * Save the current nickname in a hash list entry on the mount point.
1118  */
1119 int
1120 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1121                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1122                  struct mbuf *mrep)
1123 {
1124         struct nfsuid *nuidp;
1125         u_int32_t *tl;
1126         struct timeval ktvin, ktvout;
1127         u_int32_t nick;
1128         int deltasec, error = 0;
1129         struct nfsm_info info;
1130
1131         info.md = *mdp;
1132         info.dpos = *dposp;
1133         info.mrep = mrep;
1134
1135         if (len == (3 * NFSX_UNSIGNED)) {
1136                 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
1137                 ktvin.tv_sec = *tl++;
1138                 ktvin.tv_usec = *tl++;
1139                 nick = fxdr_unsigned(u_int32_t, *tl);
1140
1141                 /*
1142                  * Decrypt the timestamp in ecb mode.
1143                  */
1144 #ifdef NFSKERB
1145                 XXX
1146 #else
1147                 ktvout.tv_sec = 0;
1148                 ktvout.tv_usec = 0;
1149 #endif
1150                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1151                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1152                 deltasec = time_second - ktvout.tv_sec;
1153                 if (deltasec < 0)
1154                         deltasec = -deltasec;
1155                 /*
1156                  * If ok, add it to the hash list for the mount point.
1157                  */
1158                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1159                         if (nmp->nm_numuids < nuidhash_max) {
1160                                 nmp->nm_numuids++;
1161                                 nuidp = (struct nfsuid *)
1162                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1163                                         M_WAITOK);
1164                         } else {
1165                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1166                                 LIST_REMOVE(nuidp, nu_hash);
1167                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1168                                         nu_lru);
1169                         }
1170                         nuidp->nu_flag = 0;
1171                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1172                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1173                         nuidp->nu_timestamp = ktvout;
1174                         nuidp->nu_nickname = nick;
1175                         bcopy(key, nuidp->nu_key, sizeof (NFSKERBKEY_T));
1176                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1177                                 nu_lru);
1178                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1179                                 nuidp, nu_hash);
1180                 }
1181         } else {
1182                 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
1183         }
1184 nfsmout:
1185         *mdp = info.md;
1186         *dposp = info.dpos;
1187         return (error);
1188 }