Merge branch 'vendor/OPENSSL'
[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 <netinet/in.h>
64 #include <netinet/tcp.h>
65 #include "xdr_subs.h"
66 #include "rpcv2.h"
67 #include "nfsproto.h"
68 #include "nfs.h"
69 #include "nfsm_subs.h"
70 #include "nfsrvcache.h"
71 #include "nfsmount.h"
72 #include "nfsnode.h"
73 #include "nfsrtt.h"
74
75 #include <sys/thread2.h>
76
77 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
78
79 /* Global defs. */
80 extern int32_t (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
81                                             struct nfssvc_sock *slp,
82                                             struct thread *td,
83                                             struct mbuf **mreqp);
84 extern int nfs_numasync;
85 extern int nfsrtton;
86 extern struct nfsstats nfsstats;
87 extern int nfsrvw_procrastinate;
88 extern int nfsrvw_procrastinate_v3;
89 static int nuidhash_max = NFS_MAXUIDHASH;
90
91 #ifndef NFS_NOSERVER
92 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
93 #endif
94 static int      nfssvc_iod (struct thread *);
95
96 #define TRUE    1
97 #define FALSE   0
98
99 static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON];
100
101 SYSCTL_DECL(_vfs_nfs);
102
103 #ifndef NFS_NOSERVER
104 int nfsd_waiting = 0;
105 static struct nfsdrt nfsdrt;
106 static int nfs_numnfsd = 0;
107 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
108                              int cacherep);
109 static int      nfssvc_addsock (struct file *, struct sockaddr *,
110                                     struct thread *);
111 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
112
113 static int nfs_privport = 0;
114 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
115 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
116 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
117 static int      nfs_soreserve = 65535;
118 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, "");
119
120 /*
121  * NFS server system calls
122  */
123
124 #endif /* NFS_NOSERVER */
125 /*
126  * nfssvc_args(int flag, caddr_t argp)
127  *
128  * Nfs server psuedo system call for the nfsd's
129  * Based on the flag value it either:
130  * - adds a socket to the selection list
131  * - remains in the kernel as an nfsd
132  * - remains in the kernel as an nfsiod
133  */
134 int
135 sys_nfssvc(struct nfssvc_args *uap)
136 {
137 #ifndef NFS_NOSERVER
138         struct nlookupdata nd;
139         struct file *fp;
140         struct sockaddr *nam;
141         struct nfsd_args nfsdarg;
142         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
143         struct nfsd_cargs ncd;
144         struct nfsd *nfsd;
145         struct nfssvc_sock *slp;
146         struct nfsuid *nuidp;
147         struct nfsmount *nmp;
148         struct vnode *vp;
149 #endif /* NFS_NOSERVER */
150         int error;
151         struct thread *td = curthread;
152
153         /*
154          * Must be super user
155          */
156         error = priv_check(td, PRIV_ROOT);
157         if(error)
158                 return (error);
159         KKASSERT(td->td_proc);  /* for ucred and p_fd */
160         while (nfssvc_sockhead_flag & SLP_INIT) {
161                  nfssvc_sockhead_flag |= SLP_WANTINIT;
162                 (void) tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
163         }
164         if (uap->flag & NFSSVC_BIOD)
165                 error = nfssvc_iod(td);
166 #ifdef NFS_NOSERVER
167         else
168                 error = ENXIO;
169 #else /* !NFS_NOSERVER */
170         else if (uap->flag & NFSSVC_MNTD) {
171                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
172                 if (error)
173                         return (error);
174                 vp = NULL;
175                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE, 
176                                         NLC_FOLLOW);
177                 if (error == 0)
178                         error = nlookup(&nd);
179                 if (error == 0)
180                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);   
181                 nlookup_done(&nd);
182                 if (error)
183                         return (error);
184
185                 if ((vp->v_flag & VROOT) == 0)
186                         error = EINVAL;
187                 nmp = VFSTONFS(vp->v_mount);
188                 vput(vp);
189                 if (error)
190                         return (error);
191                 if ((nmp->nm_state & NFSSTA_MNTD) &&
192                         (uap->flag & NFSSVC_GOTAUTH) == 0)
193                         return (0);
194                 nmp->nm_state |= NFSSTA_MNTD;
195                 error = nfs_clientd(nmp, td->td_proc->p_ucred, &ncd, uap->flag,
196                                     uap->argp, td);
197         } else if (uap->flag & NFSSVC_ADDSOCK) {
198                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
199                 if (error)
200                         return (error);
201                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
202                 if (error)
203                         return (error);
204                 /*
205                  * Get the client address for connected sockets.
206                  */
207                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
208                         nam = NULL;
209                 else {
210                         error = getsockaddr(&nam, nfsdarg.name,
211                                             nfsdarg.namelen);
212                         if (error) {
213                                 fdrop(fp);
214                                 return (error);
215                         }
216                 }
217                 error = nfssvc_addsock(fp, nam, td);
218                 fdrop(fp);
219         } else {
220                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
221                 if (error)
222                         return (error);
223                 if ((uap->flag & NFSSVC_AUTHIN) &&
224                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
225                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
226                         slp = nfsd->nfsd_slp;
227
228                         /*
229                          * First check to see if another nfsd has already
230                          * added this credential.
231                          */
232                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
233                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
234                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
235                                     (!nfsd->nfsd_nd->nd_nam2 ||
236                                      netaddr_match(NU_NETFAM(nuidp),
237                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
238                                         break;
239                         }
240                         if (nuidp) {
241                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
242                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
243                         } else {
244                             /*
245                              * Nope, so we will.
246                              */
247                             if (slp->ns_numuids < nuidhash_max) {
248                                 slp->ns_numuids++;
249                                 nuidp = (struct nfsuid *)
250                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
251                                         M_WAITOK);
252                             } else
253                                 nuidp = NULL;
254                             if ((slp->ns_flag & SLP_VALID) == 0) {
255                                 if (nuidp)
256                                     kfree((caddr_t)nuidp, M_NFSUID);
257                             } else {
258                                 if (nuidp == NULL) {
259                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
260                                     LIST_REMOVE(nuidp, nu_hash);
261                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
262                                         nu_lru);
263                                     if (nuidp->nu_flag & NU_NAM)
264                                         FREE(nuidp->nu_nam, M_SONAME);
265                                 }
266                                 nuidp->nu_flag = 0;
267                                 nuidp->nu_cr = nsd->nsd_cr;
268                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
269                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
270                                 nuidp->nu_cr.cr_ref = 1;
271                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
272                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
273                                 /*
274                                  * and save the session key in nu_key.
275                                  */
276                                 bcopy(nsd->nsd_key, nuidp->nu_key,
277                                     sizeof (nsd->nsd_key));
278                                 if (nfsd->nfsd_nd->nd_nam2) {
279                                     struct sockaddr_in *saddr;
280
281                                     saddr = (struct sockaddr_in *)
282                                             nfsd->nfsd_nd->nd_nam2;
283                                     switch (saddr->sin_family) {
284                                     case AF_INET:
285                                         nuidp->nu_flag |= NU_INETADDR;
286                                         nuidp->nu_inetaddr =
287                                              saddr->sin_addr.s_addr;
288                                         break;
289                                     case AF_ISO:
290                                     default:
291                                         nuidp->nu_flag |= NU_NAM;
292                                         nuidp->nu_nam = 
293                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
294                                         break;
295                                     };
296                                 }
297                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
298                                         nu_lru);
299                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
300                                         nuidp, nu_hash);
301                                 nfsrv_setcred(&nuidp->nu_cr,
302                                     &nfsd->nfsd_nd->nd_cr);
303                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
304                             }
305                         }
306                 }
307                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
308                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
309                 error = nfssvc_nfsd(nsd, uap->argp, td);
310         }
311 #endif /* NFS_NOSERVER */
312         if (error == EINTR || error == ERESTART)
313                 error = 0;
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                                 FREE(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         if (so->so_type == SOCK_STREAM)
350                 siz = NFS_MAXPACKET + sizeof (u_long);
351         else
352                 siz = NFS_MAXPACKET;
353         if (siz < nfs_soreserve)
354             siz = nfs_soreserve;
355         if (siz > sb_max_adj) {
356             kprintf("Warning: vfs.nfs.soreserve (%d) "
357                 "limited to adjusted sb_max (%ld)\n",
358                 nfs_soreserve, sb_max_adj);
359             siz = sb_max_adj;
360         }
361
362         error = soreserve(so, siz, siz, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
363         if (error) {
364                 if (mynam != NULL)
365                         FREE(mynam, M_SONAME);
366                 return (error);
367         }
368
369         /*
370          * Set protocol specific options { for now TCP only } and
371          * reserve some space. For datagram sockets, this can get called
372          * repeatedly for the same socket, but that isn't harmful.
373          */
374         if (so->so_type == SOCK_STREAM) {
375                 struct sockopt sopt;
376                 int val;
377
378                 bzero(&sopt, sizeof sopt);
379                 sopt.sopt_level = SOL_SOCKET;
380                 sopt.sopt_name = SO_KEEPALIVE;
381                 sopt.sopt_val = &val;
382                 sopt.sopt_valsize = sizeof val;
383                 val = 1;
384                 sosetopt(so, &sopt);
385         }
386         if (so->so_proto->pr_domain->dom_family == AF_INET &&
387             so->so_proto->pr_protocol == IPPROTO_TCP) {
388                 struct sockopt sopt;
389                 int val;
390
391                 bzero(&sopt, sizeof sopt);
392                 sopt.sopt_level = IPPROTO_TCP;
393                 sopt.sopt_name = TCP_NODELAY;
394                 sopt.sopt_val = &val;
395                 sopt.sopt_valsize = sizeof val;
396                 val = 1;
397                 sosetopt(so, &sopt);
398         }
399         so->so_rcv.ssb_flags &= ~SSB_NOINTR;
400         so->so_rcv.ssb_timeo = 0;
401         so->so_snd.ssb_flags &= ~SSB_NOINTR;
402         so->so_snd.ssb_timeo = 0;
403
404         slp = (struct nfssvc_sock *)kmalloc(sizeof (struct nfssvc_sock),
405             M_NFSSVC, M_WAITOK | M_ZERO);
406         STAILQ_INIT(&slp->ns_rec);
407         TAILQ_INIT(&slp->ns_uidlruhead);
408         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
409
410         slp->ns_so = so;
411         slp->ns_nam = mynam;
412         fp->f_count++;
413         slp->ns_fp = fp;
414         crit_enter();
415         so->so_upcallarg = (caddr_t)slp;
416         so->so_upcall = nfsrv_rcv;
417         so->so_rcv.ssb_flags |= SSB_UPCALL;
418         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
419         nfsrv_wakenfsd(slp, 1);
420         crit_exit();
421         return (0);
422 }
423
424 /*
425  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
426  * until it is killed by a signal.
427  */
428 static int
429 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
430 {
431         int siz;
432         struct nfssvc_sock *slp;
433         struct nfsd *nfsd = nsd->nsd_nfsd;
434         struct nfsrv_descript *nd = NULL;
435         struct mbuf *m, *mreq;
436         int error = 0, cacherep, sotype, writes_todo;
437         int procrastinate;
438         u_quad_t cur_usec;
439
440 #ifndef nolint
441         cacherep = RC_DOIT;
442         writes_todo = 0;
443 #endif
444         if (nfsd == NULL) {
445                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
446                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
447                 crit_enter();
448                 nfsd->nfsd_td = td;
449                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
450                 nfs_numnfsd++;
451         } else
452                 crit_enter();
453
454         /*
455          * Loop getting rpc requests until SIGKILL.
456          */
457         for (;;) {
458                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
459                         while (nfsd->nfsd_slp == NULL &&
460                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
461                                 nfsd->nfsd_flag |= NFSD_WAITING;
462                                 nfsd_waiting++;
463                                 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0);
464                                 nfsd_waiting--;
465                                 if (error)
466                                         goto done;
467                         }
468                         if (nfsd->nfsd_slp == NULL &&
469                             (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
470                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
471                                     if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
472                                         == (SLP_VALID | SLP_DOREC)) {
473                                             slp->ns_flag &= ~SLP_DOREC;
474                                             slp->ns_sref++;
475                                             nfsd->nfsd_slp = slp;
476                                             break;
477                                     }
478                                 }
479                                 if (slp == 0)
480                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
481                         }
482                         if ((slp = nfsd->nfsd_slp) == NULL)
483                                 continue;
484                         if (slp->ns_flag & SLP_VALID) {
485                                 if (slp->ns_flag & SLP_DISCONN)
486                                         nfsrv_zapsock(slp);
487                                 else if (slp->ns_flag & SLP_NEEDQ) {
488                                         slp->ns_flag &= ~SLP_NEEDQ;
489                                         (void) nfs_slplock(slp, 1);
490                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
491                                                 MB_WAIT);
492                                         nfs_slpunlock(slp);
493                                 }
494                                 error = nfsrv_dorec(slp, nfsd, &nd);
495                                 cur_usec = nfs_curusec();
496                                 if (error && slp->ns_tq.lh_first &&
497                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
498                                         error = 0;
499                                         cacherep = RC_DOIT;
500                                         writes_todo = 1;
501                                 } else
502                                         writes_todo = 0;
503                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
504                         }
505                 } else {
506                         error = 0;
507                         slp = nfsd->nfsd_slp;
508                 }
509                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
510                         if (nd) {
511                                 kfree((caddr_t)nd, M_NFSRVDESC);
512                                 nd = NULL;
513                         }
514                         nfsd->nfsd_slp = NULL;
515                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
516                         nfsrv_slpderef(slp);
517                         continue;
518                 }
519                 crit_exit();
520                 sotype = slp->ns_so->so_type;
521                 if (nd) {
522                     getmicrotime(&nd->nd_starttime);
523                     if (nd->nd_nam2)
524                         nd->nd_nam = nd->nd_nam2;
525                     else
526                         nd->nd_nam = slp->ns_nam;
527
528                     /*
529                      * Check to see if authorization is needed.
530                      */
531                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
532                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
533                         nsd->nsd_haddr = 
534                                 ((struct sockaddr_in *)
535                                  nd->nd_nam)->sin_addr.s_addr;
536                         nsd->nsd_authlen = nfsd->nfsd_authlen;
537                         nsd->nsd_verflen = nfsd->nfsd_verflen;
538                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
539                                 nfsd->nfsd_authlen) &&
540                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
541                                 nfsd->nfsd_verflen) &&
542                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
543                             return (ENEEDAUTH);
544                         cacherep = RC_DROPIT;
545                     } else {
546                         cacherep = nfsrv_getcache(nd, slp, &mreq);
547                     }
548
549                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
550                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
551                         nd->nd_procnum = NFSPROC_NOOP;
552                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
553                         cacherep = RC_DOIT;
554                     } else if (nfs_privport) {
555                         /* Check if source port is privileged */
556                         u_short port;
557                         struct sockaddr *nam = nd->nd_nam;
558                         struct sockaddr_in *sin;
559
560                         sin = (struct sockaddr_in *)nam;
561                         port = ntohs(sin->sin_port);
562                         if (port >= IPPORT_RESERVED && 
563                             nd->nd_procnum != NFSPROC_NULL) {
564                             nd->nd_procnum = NFSPROC_NOOP;
565                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
566                             cacherep = RC_DOIT;
567                             kprintf("NFS request from unprivileged port (%s:%d)\n",
568                                    inet_ntoa(sin->sin_addr), port);
569                         }
570                     }
571
572                 }
573
574                 /*
575                  * Loop to get all the write rpc relies that have been
576                  * gathered together.
577                  */
578                 do {
579                     switch (cacherep) {
580                     case RC_DOIT:
581                         if (nd && (nd->nd_flag & ND_NFSV3))
582                             procrastinate = nfsrvw_procrastinate_v3;
583                         else
584                             procrastinate = nfsrvw_procrastinate;
585                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
586                             procrastinate > 0)
587                         ) {
588                             error = nfsrv_writegather(&nd, slp,
589                                 nfsd->nfsd_td, &mreq);
590                         } else {
591                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
592                                 slp, nfsd->nfsd_td, &mreq);
593                         }
594                         if (mreq == NULL)
595                                 break;
596                         if (error != 0 && error != NFSERR_RETVOID) {
597                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
598                                         nfsstats.srv_errs++;
599                                 nfsrv_updatecache(nd, FALSE, mreq);
600                                 if (nd->nd_nam2)
601                                         FREE(nd->nd_nam2, M_SONAME);
602                                 break;
603                         }
604                         nfsstats.srvrpccnt[nd->nd_procnum]++;
605                         nfsrv_updatecache(nd, TRUE, mreq);
606                         nd->nd_mrep = NULL;
607                     case RC_REPLY:
608                         m = mreq;
609                         siz = 0;
610                         while (m) {
611                                 siz += m->m_len;
612                                 m = m->m_next;
613                         }
614                         if (siz <= 0 || siz > NFS_MAXPACKET) {
615                                 kprintf("mbuf siz=%d\n",siz);
616                                 panic("Bad nfs svc reply");
617                         }
618                         m = mreq;
619                         m->m_pkthdr.len = siz;
620                         m->m_pkthdr.rcvif = NULL;
621                         /*
622                          * For stream protocols, prepend a Sun RPC
623                          * Record Mark.
624                          */
625                         if (sotype == SOCK_STREAM) {
626                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
627                                 if (m == NULL)
628                                         return (ENOBUFS);
629                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
630                         }
631                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
632                                 (void) nfs_slplock(slp, 1);
633                         if (slp->ns_flag & SLP_VALID)
634                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
635                         else {
636                             error = EPIPE;
637                             m_freem(m);
638                         }
639                         if (nfsrtton)
640                                 nfsd_rt(sotype, nd, cacherep);
641                         if (nd->nd_nam2)
642                                 FREE(nd->nd_nam2, M_SONAME);
643                         if (nd->nd_mrep)
644                                 m_freem(nd->nd_mrep);
645                         if (error == EPIPE)
646                                 nfsrv_zapsock(slp);
647                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
648                                 nfs_slpunlock(slp);
649                         if (error == EINTR || error == ERESTART) {
650                                 kfree((caddr_t)nd, M_NFSRVDESC);
651                                 nfsrv_slpderef(slp);
652                                 crit_enter();
653                                 goto done;
654                         }
655                         break;
656                     case RC_DROPIT:
657                         if (nfsrtton)
658                                 nfsd_rt(sotype, nd, cacherep);
659                         m_freem(nd->nd_mrep);
660                         if (nd->nd_nam2)
661                                 FREE(nd->nd_nam2, M_SONAME);
662                         break;
663                     };
664                     if (nd) {
665                         FREE((caddr_t)nd, M_NFSRVDESC);
666                         nd = NULL;
667                     }
668
669                     /*
670                      * Check to see if there are outstanding writes that
671                      * need to be serviced.
672                      */
673                     cur_usec = nfs_curusec();
674                     crit_enter();
675                     if (slp->ns_tq.lh_first &&
676                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
677                         cacherep = RC_DOIT;
678                         writes_todo = 1;
679                     } else
680                         writes_todo = 0;
681                     crit_exit();
682                 } while (writes_todo);
683                 crit_enter();
684                 if (nfsrv_dorec(slp, nfsd, &nd)) {
685                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
686                         nfsd->nfsd_slp = NULL;
687                         nfsrv_slpderef(slp);
688                 }
689         }
690 done:
691         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
692         crit_exit();
693         kfree((caddr_t)nfsd, M_NFSD);
694         nsd->nsd_nfsd = NULL;
695         if (--nfs_numnfsd == 0)
696                 nfsrv_init(TRUE);       /* Reinitialize everything */
697         return (error);
698 }
699
700 /*
701  * Shut down a socket associated with an nfssvc_sock structure.
702  * Should be called with the send lock set, if required.
703  * The trick here is to increment the sref at the start, so that the nfsds
704  * will stop using it and clear ns_flag at the end so that it will not be
705  * reassigned during cleanup.
706  */
707 static void
708 nfsrv_zapsock(struct nfssvc_sock *slp)
709 {
710         struct nfsuid *nuidp, *nnuidp;
711         struct nfsrv_descript *nwp, *nnwp;
712         struct socket *so;
713         struct file *fp;
714         struct nfsrv_rec *rec;
715
716         slp->ns_flag &= ~SLP_ALLFLAGS;
717         fp = slp->ns_fp;
718         if (fp) {
719                 slp->ns_fp = NULL;
720                 so = slp->ns_so;
721                 so->so_rcv.ssb_flags &= ~SSB_UPCALL;
722                 so->so_upcall = NULL;
723                 so->so_upcallarg = NULL;
724                 soshutdown(so, SHUT_RDWR);
725                 closef(fp, NULL);
726                 if (slp->ns_nam)
727                         FREE(slp->ns_nam, M_SONAME);
728                 m_freem(slp->ns_raw);
729                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
730                         --slp->ns_numrec;
731                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
732                         if (rec->nr_address)
733                                 FREE(rec->nr_address, M_SONAME);
734                         m_freem(rec->nr_packet);
735                         kfree(rec, M_NFSRVDESC);
736                 }
737                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
738                                       nnuidp) {
739                         LIST_REMOVE(nuidp, nu_hash);
740                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
741                         if (nuidp->nu_flag & NU_NAM)
742                                 FREE(nuidp->nu_nam, M_SONAME);
743                         kfree((caddr_t)nuidp, M_NFSUID);
744                 }
745                 crit_enter();
746                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
747                         nnwp = nwp->nd_tq.le_next;
748                         LIST_REMOVE(nwp, nd_tq);
749                         kfree((caddr_t)nwp, M_NFSRVDESC);
750                 }
751                 LIST_INIT(&slp->ns_tq);
752                 crit_exit();
753         }
754 }
755
756 /*
757  * Derefence a server socket structure. If it has no more references and
758  * is no longer valid, you can throw it away.
759  */
760 void
761 nfsrv_slpderef(struct nfssvc_sock *slp)
762 {
763         if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
764                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
765                 kfree((caddr_t)slp, M_NFSSVC);
766         }
767 }
768
769 /*
770  * Lock a socket against others.
771  */
772 int
773 nfs_slplock(struct nfssvc_sock *slp, int wait)
774 {
775         int *statep = &slp->ns_solock;
776
777         if (!wait && (*statep & NFSSTA_SNDLOCK))
778                 return(0);      /* already locked, fail */
779         while (*statep & NFSSTA_SNDLOCK) {
780                 *statep |= NFSSTA_WANTSND;
781                 (void) tsleep((caddr_t)statep, 0, "nfsslplck", 0);
782         }
783         *statep |= NFSSTA_SNDLOCK;
784         return (1);
785 }
786
787 /*
788  * Unlock the stream socket for others.
789  */
790 void
791 nfs_slpunlock(struct nfssvc_sock *slp)
792 {
793         int *statep = &slp->ns_solock;
794
795         if ((*statep & NFSSTA_SNDLOCK) == 0)
796                 panic("nfs slpunlock");
797         *statep &= ~NFSSTA_SNDLOCK;
798         if (*statep & NFSSTA_WANTSND) {
799                 *statep &= ~NFSSTA_WANTSND;
800                 wakeup((caddr_t)statep);
801         }
802 }
803
804 /*
805  * Initialize the data structures for the server.
806  * Handshake with any new nfsds starting up to avoid any chance of
807  * corruption.
808  */
809 void
810 nfsrv_init(int terminating)
811 {
812         struct nfssvc_sock *slp, *nslp;
813
814         if (nfssvc_sockhead_flag & SLP_INIT)
815                 panic("nfsd init");
816         nfssvc_sockhead_flag |= SLP_INIT;
817         if (terminating) {
818                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
819                         if (slp->ns_flag & SLP_VALID)
820                                 nfsrv_zapsock(slp);
821                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
822                         kfree((caddr_t)slp, M_NFSSVC);
823                 }
824                 nfsrv_cleancache();     /* And clear out server cache */
825         } else
826                 nfs_pub.np_valid = 0;
827
828         TAILQ_INIT(&nfssvc_sockhead);
829         nfssvc_sockhead_flag &= ~SLP_INIT;
830         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
831                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
832                 wakeup((caddr_t)&nfssvc_sockhead);
833         }
834
835         TAILQ_INIT(&nfsd_head);
836         nfsd_head_flag &= ~NFSD_CHECKSLP;
837
838 #if 0
839         nfs_udpsock = (struct nfssvc_sock *)
840             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
841         STAILQ_INIT(&nfs_udpsock->ns_rec);
842         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
843         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
844
845         nfs_cltpsock = (struct nfssvc_sock *)
846             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
847         STAILQ_INIT(&nfs_cltpsock->ns_rec);
848         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
849         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
850 #endif
851 }
852
853 /*
854  * Add entries to the server monitor log.
855  */
856 static void
857 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
858 {
859         struct drt *rt;
860
861         rt = &nfsdrt.drt[nfsdrt.pos];
862         if (cacherep == RC_DOIT)
863                 rt->flag = 0;
864         else if (cacherep == RC_REPLY)
865                 rt->flag = DRT_CACHEREPLY;
866         else
867                 rt->flag = DRT_CACHEDROP;
868         if (sotype == SOCK_STREAM)
869                 rt->flag |= DRT_TCP;
870         if (nd->nd_flag & ND_NFSV3)
871                 rt->flag |= DRT_NFSV3;
872         rt->proc = nd->nd_procnum;
873         if (nd->nd_nam->sa_family == AF_INET)
874             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
875         else
876             rt->ipadr = INADDR_ANY;
877         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
878         getmicrotime(&rt->tstamp);
879         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
880 }
881 #endif /* NFS_NOSERVER */
882
883 static int nfs_defect = 0;
884 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
885
886 /*
887  * Asynchronous I/O daemons for client nfs.
888  * They do read-ahead and write-behind operations on the block I/O cache.
889  * Never returns unless it fails or gets killed.
890  */
891 static int
892 nfssvc_iod(struct thread *td)
893 {
894         struct bio *bio;
895         int i, myiod;
896         struct nfsmount *nmp;
897         int error = 0;
898
899         /*
900          * Assign my position or return error if too many already running
901          */
902         myiod = -1;
903         for (i = 0; i < NFS_MAXASYNCDAEMON; i++)
904                 if (nfs_asyncdaemon[i] == 0) {
905                         nfs_asyncdaemon[i]++;
906                         myiod = i;
907                         break;
908                 }
909         if (myiod == -1)
910                 return (EBUSY);
911         nfs_numasync++;
912         /*
913          * Just loop around doin our stuff until SIGKILL
914          */
915         for (;;) {
916             while (((nmp = nfs_iodmount[myiod]) == NULL
917                      || TAILQ_EMPTY(&nmp->nm_bioq))
918                    && error == 0) {
919                 if (nmp)
920                     nmp->nm_bioqiods--;
921                 nfs_iodwant[myiod] = td;
922                 nfs_iodmount[myiod] = NULL;
923                 error = tsleep((caddr_t)&nfs_iodwant[myiod],
924                         PCATCH, "nfsidl", 0);
925             }
926             if (error) {
927                 nfs_asyncdaemon[myiod] = 0;
928                 if (nmp)
929                     nmp->nm_bioqiods--;
930                 nfs_iodwant[myiod] = NULL;
931                 nfs_iodmount[myiod] = NULL;
932                 nfs_numasync--;
933                 return (error);
934             }
935             while ((bio = TAILQ_FIRST(&nmp->nm_bioq)) != NULL) {
936                 /* 
937                  * Take one off the front of the list.   The BIO's
938                  * block number is normalized for DEV_BSIZE.
939                  */
940                 TAILQ_REMOVE(&nmp->nm_bioq, bio, bio_act);
941                 nmp->nm_bioqlen--;
942                 if (nmp->nm_bioqwant && nmp->nm_bioqlen <= nfs_numasync) {
943                     nmp->nm_bioqwant = FALSE;
944                     wakeup(&nmp->nm_bioq);
945                 }
946                 nfs_doio((struct vnode *)bio->bio_driver_info, bio, NULL);
947                 /*
948                  * If there are more than one iod on this mount, then defect
949                  * so that the iods can be shared out fairly between the mounts
950                  */
951                 if (nfs_defect && nmp->nm_bioqiods > 1) {
952                     NFS_DPF(ASYNCIO,
953                             ("nfssvc_iod: iod %d defecting from mount %p\n",
954                              myiod, nmp));
955                     nfs_iodmount[myiod] = NULL;
956                     nmp->nm_bioqiods--;
957                     break;
958                 }
959             }
960         }
961 }
962
963
964 /*
965  * Get an authorization string for the uid by having the mount_nfs sitting
966  * on this mount point porpous out of the kernel and do it.
967  */
968 int
969 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
970             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
971             int *verf_len, NFSKERBKEY_T key /* return session key */)
972 {
973         int error = 0;
974
975         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
976                 nmp->nm_state |= NFSSTA_WANTAUTH;
977                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
978                         "nfsauth1", 2 * hz);
979                 error = nfs_sigintr(nmp, rep, rep->r_td);
980                 if (error) {
981                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
982                         return (error);
983                 }
984         }
985         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
986         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
987         nmp->nm_authlen = RPCAUTH_MAXSIZ;
988         nmp->nm_verfstr = verf_str;
989         nmp->nm_verflen = *verf_len;
990         nmp->nm_authuid = cred->cr_uid;
991         wakeup((caddr_t)&nmp->nm_authstr);
992
993         /*
994          * And wait for mount_nfs to do its stuff.
995          */
996         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
997                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
998                         "nfsauth2", 2 * hz);
999                 error = nfs_sigintr(nmp, rep, rep->r_td);
1000         }
1001         if (nmp->nm_state & NFSSTA_AUTHERR) {
1002                 nmp->nm_state &= ~NFSSTA_AUTHERR;
1003                 error = EAUTH;
1004         }
1005         if (error)
1006                 kfree((caddr_t)*auth_str, M_TEMP);
1007         else {
1008                 *auth_len = nmp->nm_authlen;
1009                 *verf_len = nmp->nm_verflen;
1010                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
1011         }
1012         nmp->nm_state &= ~NFSSTA_HASAUTH;
1013         nmp->nm_state |= NFSSTA_WAITAUTH;
1014         if (nmp->nm_state & NFSSTA_WANTAUTH) {
1015                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
1016                 wakeup((caddr_t)&nmp->nm_authtype);
1017         }
1018         return (error);
1019 }
1020
1021 /*
1022  * Get a nickname authenticator and verifier.
1023  */
1024 int
1025 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
1026                 int *auth_len, char *verf_str, int verf_len)
1027 {
1028         struct nfsuid *nuidp;
1029         u_int32_t *nickp, *verfp;
1030         struct timeval ktvin, ktvout;
1031
1032 #ifdef DIAGNOSTIC
1033         if (verf_len < (4 * NFSX_UNSIGNED))
1034                 panic("nfs_getnickauth verf too small");
1035 #endif
1036         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
1037             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1038                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
1039                         break;
1040         }
1041         if (!nuidp || nuidp->nu_expire < time_second)
1042                 return (EACCES);
1043
1044         /*
1045          * Move to the end of the lru list (end of lru == most recently used).
1046          */
1047         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
1048         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
1049
1050         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
1051         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
1052         *nickp = txdr_unsigned(nuidp->nu_nickname);
1053         *auth_str = (char *)nickp;
1054         *auth_len = 2 * NFSX_UNSIGNED;
1055
1056         /*
1057          * Now we must encrypt the verifier and package it up.
1058          */
1059         verfp = (u_int32_t *)verf_str;
1060         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
1061         if (time_second > nuidp->nu_timestamp.tv_sec ||
1062             (time_second == nuidp->nu_timestamp.tv_sec &&
1063              time_second > nuidp->nu_timestamp.tv_usec))
1064                 getmicrotime(&nuidp->nu_timestamp);
1065         else
1066                 nuidp->nu_timestamp.tv_usec++;
1067         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
1068         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1069
1070         /*
1071          * Now encrypt the timestamp verifier in ecb mode using the session
1072          * key.
1073          */
1074 #ifdef NFSKERB
1075         XXX
1076 #endif
1077
1078         *verfp++ = ktvout.tv_sec;
1079         *verfp++ = ktvout.tv_usec;
1080         *verfp = 0;
1081         return (0);
1082 }
1083
1084 /*
1085  * Save the current nickname in a hash list entry on the mount point.
1086  */
1087 int
1088 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1089                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1090                  struct mbuf *mrep)
1091 {
1092         struct nfsuid *nuidp;
1093         u_int32_t *tl;
1094         int32_t t1;
1095         struct mbuf *md = *mdp;
1096         struct timeval ktvin, ktvout;
1097         u_int32_t nick;
1098         char *dpos = *dposp, *cp2;
1099         int deltasec, error = 0;
1100
1101         if (len == (3 * NFSX_UNSIGNED)) {
1102                 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1103                 ktvin.tv_sec = *tl++;
1104                 ktvin.tv_usec = *tl++;
1105                 nick = fxdr_unsigned(u_int32_t, *tl);
1106
1107                 /*
1108                  * Decrypt the timestamp in ecb mode.
1109                  */
1110 #ifdef NFSKERB
1111                 XXX
1112 #endif
1113                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1114                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1115                 deltasec = time_second - ktvout.tv_sec;
1116                 if (deltasec < 0)
1117                         deltasec = -deltasec;
1118                 /*
1119                  * If ok, add it to the hash list for the mount point.
1120                  */
1121                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1122                         if (nmp->nm_numuids < nuidhash_max) {
1123                                 nmp->nm_numuids++;
1124                                 nuidp = (struct nfsuid *)
1125                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1126                                         M_WAITOK);
1127                         } else {
1128                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1129                                 LIST_REMOVE(nuidp, nu_hash);
1130                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1131                                         nu_lru);
1132                         }
1133                         nuidp->nu_flag = 0;
1134                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1135                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1136                         nuidp->nu_timestamp = ktvout;
1137                         nuidp->nu_nickname = nick;
1138                         bcopy(key, nuidp->nu_key, sizeof (key));
1139                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1140                                 nu_lru);
1141                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1142                                 nuidp, nu_hash);
1143                 }
1144         } else
1145                 nfsm_adv(nfsm_rndup(len));
1146 nfsmout:
1147         *mdp = md;
1148         *dposp = dpos;
1149         return (error);
1150 }