NFS - create nfsm_subs.c, clean up externs
[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 <sys/mutex.h>
62 #include <vm/vm_zone.h>
63
64 #include <sys/mutex2.h>
65
66 #include <netinet/in.h>
67 #include <netinet/tcp.h>
68 #include "xdr_subs.h"
69 #include "rpcv2.h"
70 #include "nfsproto.h"
71 #include "nfs.h"
72 #include "nfsm_subs.h"
73 #include "nfsrvcache.h"
74 #include "nfsmount.h"
75 #include "nfsnode.h"
76 #include "nfsrtt.h"
77
78 #include <sys/thread2.h>
79
80 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure");
81
82 static int nuidhash_max = NFS_MAXUIDHASH;
83
84 #ifndef NFS_NOSERVER
85 static void     nfsrv_zapsock (struct nfssvc_sock *slp);
86 #endif
87
88 #define TRUE    1
89 #define FALSE   0
90
91 SYSCTL_DECL(_vfs_nfs);
92
93 #ifndef NFS_NOSERVER
94 int nfsd_waiting = 0;
95 static struct nfsdrt nfsdrt;
96 static int nfs_numnfsd = 0;
97 static void     nfsd_rt (int sotype, struct nfsrv_descript *nd,
98                              int cacherep);
99 static int      nfssvc_addsock (struct file *, struct sockaddr *,
100                                     struct thread *);
101 static int      nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *);
102
103 static int nfs_privport = 0;
104 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, "");
105 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, "");
106 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, "");
107 static int      nfs_soreserve = 65535;
108 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, "");
109
110 /*
111  * NFS server system calls
112  */
113
114 #endif /* NFS_NOSERVER */
115 /*
116  * nfssvc_args(int flag, caddr_t argp)
117  *
118  * Nfs server psuedo system call for the nfsd's
119  * Based on the flag value it either:
120  * - adds a socket to the selection list
121  * - remains in the kernel as an nfsd
122  * - remains in the kernel as an nfsiod
123  */
124 int
125 sys_nfssvc(struct nfssvc_args *uap)
126 {
127 #ifndef NFS_NOSERVER
128         struct nlookupdata nd;
129         struct file *fp;
130         struct sockaddr *nam;
131         struct nfsd_args nfsdarg;
132         struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs;
133         struct nfsd_cargs ncd;
134         struct nfsd *nfsd;
135         struct nfssvc_sock *slp;
136         struct nfsuid *nuidp;
137         struct nfsmount *nmp;
138         struct vnode *vp;
139 #endif /* NFS_NOSERVER */
140         int error;
141         struct thread *td = curthread;
142
143         /*
144          * Must be super user
145          */
146         error = priv_check(td, PRIV_ROOT);
147         if(error)
148                 return (error);
149         KKASSERT(td->td_proc);  /* for ucred and p_fd */
150         while (nfssvc_sockhead_flag & SLP_INIT) {
151                  nfssvc_sockhead_flag |= SLP_WANTINIT;
152                 (void) tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0);
153         }
154         if (uap->flag & NFSSVC_BIOD)
155                 error = ENXIO;          /* no longer need nfsiod's */
156 #ifdef NFS_NOSERVER
157         else
158                 error = ENXIO;
159 #else /* !NFS_NOSERVER */
160         else if (uap->flag & NFSSVC_MNTD) {
161                 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd));
162                 if (error)
163                         return (error);
164                 vp = NULL;
165                 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE, 
166                                         NLC_FOLLOW);
167                 if (error == 0)
168                         error = nlookup(&nd);
169                 if (error == 0)
170                         error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp);   
171                 nlookup_done(&nd);
172                 if (error)
173                         return (error);
174
175                 if ((vp->v_flag & VROOT) == 0)
176                         error = EINVAL;
177                 nmp = VFSTONFS(vp->v_mount);
178                 vput(vp);
179                 if (error)
180                         return (error);
181                 if ((nmp->nm_state & NFSSTA_MNTD) &&
182                         (uap->flag & NFSSVC_GOTAUTH) == 0)
183                         return (0);
184                 nmp->nm_state |= NFSSTA_MNTD;
185                 error = nfs_clientd(nmp, td->td_proc->p_ucred, &ncd, uap->flag,
186                                     uap->argp, td);
187         } else if (uap->flag & NFSSVC_ADDSOCK) {
188                 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg));
189                 if (error)
190                         return (error);
191                 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp);
192                 if (error)
193                         return (error);
194                 /*
195                  * Get the client address for connected sockets.
196                  */
197                 if (nfsdarg.name == NULL || nfsdarg.namelen == 0)
198                         nam = NULL;
199                 else {
200                         error = getsockaddr(&nam, nfsdarg.name,
201                                             nfsdarg.namelen);
202                         if (error) {
203                                 fdrop(fp);
204                                 return (error);
205                         }
206                 }
207                 error = nfssvc_addsock(fp, nam, td);
208                 fdrop(fp);
209         } else {
210                 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd));
211                 if (error)
212                         return (error);
213                 if ((uap->flag & NFSSVC_AUTHIN) &&
214                     ((nfsd = nsd->nsd_nfsd)) != NULL &&
215                     (nfsd->nfsd_slp->ns_flag & SLP_VALID)) {
216                         slp = nfsd->nfsd_slp;
217
218                         /*
219                          * First check to see if another nfsd has already
220                          * added this credential.
221                          */
222                         for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first;
223                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
224                                 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid &&
225                                     (!nfsd->nfsd_nd->nd_nam2 ||
226                                      netaddr_match(NU_NETFAM(nuidp),
227                                      &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2)))
228                                         break;
229                         }
230                         if (nuidp) {
231                             nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr);
232                             nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
233                         } else {
234                             /*
235                              * Nope, so we will.
236                              */
237                             if (slp->ns_numuids < nuidhash_max) {
238                                 slp->ns_numuids++;
239                                 nuidp = (struct nfsuid *)
240                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
241                                         M_WAITOK);
242                             } else
243                                 nuidp = NULL;
244                             if ((slp->ns_flag & SLP_VALID) == 0) {
245                                 if (nuidp)
246                                     kfree((caddr_t)nuidp, M_NFSUID);
247                             } else {
248                                 if (nuidp == NULL) {
249                                     nuidp = TAILQ_FIRST(&slp->ns_uidlruhead);
250                                     LIST_REMOVE(nuidp, nu_hash);
251                                     TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp,
252                                         nu_lru);
253                                     if (nuidp->nu_flag & NU_NAM)
254                                         FREE(nuidp->nu_nam, M_SONAME);
255                                 }
256                                 nuidp->nu_flag = 0;
257                                 nuidp->nu_cr = nsd->nsd_cr;
258                                 if (nuidp->nu_cr.cr_ngroups > NGROUPS)
259                                     nuidp->nu_cr.cr_ngroups = NGROUPS;
260                                 nuidp->nu_cr.cr_ref = 1;
261                                 nuidp->nu_timestamp = nsd->nsd_timestamp;
262                                 nuidp->nu_expire = time_second + nsd->nsd_ttl;
263                                 /*
264                                  * and save the session key in nu_key.
265                                  */
266                                 bcopy(nsd->nsd_key, nuidp->nu_key,
267                                     sizeof (nsd->nsd_key));
268                                 if (nfsd->nfsd_nd->nd_nam2) {
269                                     struct sockaddr_in *saddr;
270
271                                     saddr = (struct sockaddr_in *)
272                                             nfsd->nfsd_nd->nd_nam2;
273                                     switch (saddr->sin_family) {
274                                     case AF_INET:
275                                         nuidp->nu_flag |= NU_INETADDR;
276                                         nuidp->nu_inetaddr =
277                                              saddr->sin_addr.s_addr;
278                                         break;
279                                     case AF_ISO:
280                                     default:
281                                         nuidp->nu_flag |= NU_NAM;
282                                         nuidp->nu_nam = 
283                                           dup_sockaddr(nfsd->nfsd_nd->nd_nam2);
284                                         break;
285                                     };
286                                 }
287                                 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp,
288                                         nu_lru);
289                                 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid),
290                                         nuidp, nu_hash);
291                                 nfsrv_setcred(&nuidp->nu_cr,
292                                     &nfsd->nfsd_nd->nd_cr);
293                                 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL;
294                             }
295                         }
296                 }
297                 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd))
298                         nfsd->nfsd_flag |= NFSD_AUTHFAIL;
299                 error = nfssvc_nfsd(nsd, uap->argp, td);
300         }
301 #endif /* NFS_NOSERVER */
302         if (error == EINTR || error == ERESTART)
303                 error = 0;
304         return (error);
305 }
306
307 #ifndef NFS_NOSERVER
308 /*
309  * Adds a socket to the list for servicing by nfsds.
310  */
311 static int
312 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td)
313 {
314         int siz;
315         struct nfssvc_sock *slp;
316         struct socket *so;
317         int error;
318
319         so = (struct socket *)fp->f_data;
320 #if 0
321         tslp = NULL;
322         /*
323          * Add it to the list, as required.
324          */
325         if (so->so_proto->pr_protocol == IPPROTO_UDP) {
326                 tslp = nfs_udpsock;
327                 if (tslp->ns_flag & SLP_VALID) {
328                         if (mynam != NULL)
329                                 FREE(mynam, M_SONAME);
330                         return (EPERM);
331                 }
332         }
333 #endif
334         /*
335          * Reserve buffer space in the socket.  Note that due to bugs in
336          * Linux's delayed-ack code, serious performance degredation may
337          * occur with linux hosts if the minimum is used.
338          */
339         if (so->so_type == SOCK_STREAM)
340                 siz = NFS_MAXPACKET + sizeof (u_long);
341         else
342                 siz = NFS_MAXPACKET;
343         if (siz < nfs_soreserve)
344             siz = nfs_soreserve;
345         if (siz > sb_max_adj) {
346             kprintf("Warning: vfs.nfs.soreserve (%d) "
347                 "limited to adjusted sb_max (%ld)\n",
348                 nfs_soreserve, sb_max_adj);
349             siz = sb_max_adj;
350         }
351
352         error = soreserve(so, siz, siz, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
353         if (error) {
354                 if (mynam != NULL)
355                         FREE(mynam, M_SONAME);
356                 return (error);
357         }
358
359         /*
360          * Set protocol specific options { for now TCP only } and
361          * reserve some space. For datagram sockets, this can get called
362          * repeatedly for the same socket, but that isn't harmful.
363          */
364         if (so->so_type == SOCK_STREAM) {
365                 struct sockopt sopt;
366                 int val;
367
368                 bzero(&sopt, sizeof sopt);
369                 sopt.sopt_level = SOL_SOCKET;
370                 sopt.sopt_name = SO_KEEPALIVE;
371                 sopt.sopt_val = &val;
372                 sopt.sopt_valsize = sizeof val;
373                 val = 1;
374                 sosetopt(so, &sopt);
375         }
376         if (so->so_proto->pr_domain->dom_family == AF_INET &&
377             so->so_proto->pr_protocol == IPPROTO_TCP) {
378                 struct sockopt sopt;
379                 int val;
380
381                 bzero(&sopt, sizeof sopt);
382                 sopt.sopt_level = IPPROTO_TCP;
383                 sopt.sopt_name = TCP_NODELAY;
384                 sopt.sopt_val = &val;
385                 sopt.sopt_valsize = sizeof val;
386                 val = 1;
387                 sosetopt(so, &sopt);
388         }
389         so->so_rcv.ssb_flags &= ~SSB_NOINTR;
390         so->so_rcv.ssb_timeo = 0;
391         so->so_snd.ssb_flags &= ~SSB_NOINTR;
392         so->so_snd.ssb_timeo = 0;
393
394         slp = (struct nfssvc_sock *)kmalloc(sizeof (struct nfssvc_sock),
395             M_NFSSVC, M_WAITOK | M_ZERO);
396         mtx_init(&slp->ns_solock);
397         STAILQ_INIT(&slp->ns_rec);
398         TAILQ_INIT(&slp->ns_uidlruhead);
399         TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain);
400
401         slp->ns_so = so;
402         slp->ns_nam = mynam;
403         fp->f_count++;
404         slp->ns_fp = fp;
405         crit_enter();
406         so->so_upcallarg = (caddr_t)slp;
407         so->so_upcall = nfsrv_rcv;
408         so->so_rcv.ssb_flags |= SSB_UPCALL;
409         slp->ns_flag = (SLP_VALID | SLP_NEEDQ);
410         nfsrv_wakenfsd(slp, 1);
411         crit_exit();
412         return (0);
413 }
414
415 /*
416  * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
417  * until it is killed by a signal.
418  */
419 static int
420 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td)
421 {
422         int siz;
423         struct nfssvc_sock *slp;
424         struct nfsd *nfsd = nsd->nsd_nfsd;
425         struct nfsrv_descript *nd = NULL;
426         struct mbuf *m, *mreq;
427         int error = 0, cacherep, sotype, writes_todo;
428         int procrastinate;
429         u_quad_t cur_usec;
430
431 #ifndef nolint
432         cacherep = RC_DOIT;
433         writes_todo = 0;
434 #endif
435         if (nfsd == NULL) {
436                 nsd->nsd_nfsd = nfsd = (struct nfsd *)
437                         kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO);
438                 crit_enter();
439                 nfsd->nfsd_td = td;
440                 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain);
441                 nfs_numnfsd++;
442         } else
443                 crit_enter();
444
445         /*
446          * Loop getting rpc requests until SIGKILL.
447          */
448         for (;;) {
449                 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) {
450                         while (nfsd->nfsd_slp == NULL &&
451                             (nfsd_head_flag & NFSD_CHECKSLP) == 0) {
452                                 nfsd->nfsd_flag |= NFSD_WAITING;
453                                 nfsd_waiting++;
454                                 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0);
455                                 nfsd_waiting--;
456                                 if (error)
457                                         goto done;
458                         }
459                         if (nfsd->nfsd_slp == NULL &&
460                             (nfsd_head_flag & NFSD_CHECKSLP) != 0) {
461                                 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
462                                     if ((slp->ns_flag & (SLP_VALID | SLP_DOREC))
463                                         == (SLP_VALID | SLP_DOREC)) {
464                                             slp->ns_flag &= ~SLP_DOREC;
465                                             slp->ns_sref++;
466                                             nfsd->nfsd_slp = slp;
467                                             break;
468                                     }
469                                 }
470                                 if (slp == 0)
471                                         nfsd_head_flag &= ~NFSD_CHECKSLP;
472                         }
473                         if ((slp = nfsd->nfsd_slp) == NULL)
474                                 continue;
475                         if (slp->ns_flag & SLP_VALID) {
476                                 if (slp->ns_flag & SLP_DISCONN)
477                                         nfsrv_zapsock(slp);
478                                 else if (slp->ns_flag & SLP_NEEDQ) {
479                                         slp->ns_flag &= ~SLP_NEEDQ;
480                                         (void) nfs_slplock(slp, 1);
481                                         nfsrv_rcv(slp->ns_so, (caddr_t)slp,
482                                                 MB_WAIT);
483                                         nfs_slpunlock(slp);
484                                 }
485                                 error = nfsrv_dorec(slp, nfsd, &nd);
486                                 cur_usec = nfs_curusec();
487                                 if (error && slp->ns_tq.lh_first &&
488                                     slp->ns_tq.lh_first->nd_time <= cur_usec) {
489                                         error = 0;
490                                         cacherep = RC_DOIT;
491                                         writes_todo = 1;
492                                 } else
493                                         writes_todo = 0;
494                                 nfsd->nfsd_flag |= NFSD_REQINPROG;
495                         }
496                 } else {
497                         error = 0;
498                         slp = nfsd->nfsd_slp;
499                 }
500                 if (error || (slp->ns_flag & SLP_VALID) == 0) {
501                         if (nd) {
502                                 kfree((caddr_t)nd, M_NFSRVDESC);
503                                 nd = NULL;
504                         }
505                         nfsd->nfsd_slp = NULL;
506                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
507                         nfsrv_slpderef(slp);
508                         continue;
509                 }
510                 crit_exit();
511                 sotype = slp->ns_so->so_type;
512                 if (nd) {
513                     getmicrotime(&nd->nd_starttime);
514                     if (nd->nd_nam2)
515                         nd->nd_nam = nd->nd_nam2;
516                     else
517                         nd->nd_nam = slp->ns_nam;
518
519                     /*
520                      * Check to see if authorization is needed.
521                      */
522                     if (nfsd->nfsd_flag & NFSD_NEEDAUTH) {
523                         nfsd->nfsd_flag &= ~NFSD_NEEDAUTH;
524                         nsd->nsd_haddr = 
525                                 ((struct sockaddr_in *)
526                                  nd->nd_nam)->sin_addr.s_addr;
527                         nsd->nsd_authlen = nfsd->nfsd_authlen;
528                         nsd->nsd_verflen = nfsd->nfsd_verflen;
529                         if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr,
530                                 nfsd->nfsd_authlen) &&
531                             !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr,
532                                 nfsd->nfsd_verflen) &&
533                             !copyout((caddr_t)nsd, argp, sizeof (*nsd)))
534                             return (ENEEDAUTH);
535                         cacherep = RC_DROPIT;
536                     } else {
537                         cacherep = nfsrv_getcache(nd, slp, &mreq);
538                     }
539
540                     if (nfsd->nfsd_flag & NFSD_AUTHFAIL) {
541                         nfsd->nfsd_flag &= ~NFSD_AUTHFAIL;
542                         nd->nd_procnum = NFSPROC_NOOP;
543                         nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
544                         cacherep = RC_DOIT;
545                     } else if (nfs_privport) {
546                         /* Check if source port is privileged */
547                         u_short port;
548                         struct sockaddr *nam = nd->nd_nam;
549                         struct sockaddr_in *sin;
550
551                         sin = (struct sockaddr_in *)nam;
552                         port = ntohs(sin->sin_port);
553                         if (port >= IPPORT_RESERVED && 
554                             nd->nd_procnum != NFSPROC_NULL) {
555                             nd->nd_procnum = NFSPROC_NOOP;
556                             nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK);
557                             cacherep = RC_DOIT;
558                             kprintf("NFS request from unprivileged port (%s:%d)\n",
559                                    inet_ntoa(sin->sin_addr), port);
560                         }
561                     }
562
563                 }
564
565                 /*
566                  * Loop to get all the write rpc relies that have been
567                  * gathered together.
568                  */
569                 do {
570                     switch (cacherep) {
571                     case RC_DOIT:
572                         if (nd && (nd->nd_flag & ND_NFSV3))
573                             procrastinate = nfsrvw_procrastinate_v3;
574                         else
575                             procrastinate = nfsrvw_procrastinate;
576                         if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE &&
577                             procrastinate > 0)
578                         ) {
579                             error = nfsrv_writegather(&nd, slp,
580                                 nfsd->nfsd_td, &mreq);
581                         } else {
582                             error = (*(nfsrv3_procs[nd->nd_procnum]))(nd,
583                                 slp, nfsd->nfsd_td, &mreq);
584                         }
585                         if (mreq == NULL)
586                                 break;
587                         if (error != 0 && error != NFSERR_RETVOID) {
588                                 if (nd->nd_procnum != NQNFSPROC_VACATED)
589                                         nfsstats.srv_errs++;
590                                 nfsrv_updatecache(nd, FALSE, mreq);
591                                 if (nd->nd_nam2)
592                                         FREE(nd->nd_nam2, M_SONAME);
593                                 break;
594                         }
595                         nfsstats.srvrpccnt[nd->nd_procnum]++;
596                         nfsrv_updatecache(nd, TRUE, mreq);
597                         nd->nd_mrep = NULL;
598                     case RC_REPLY:
599                         m = mreq;
600                         siz = 0;
601                         while (m) {
602                                 siz += m->m_len;
603                                 m = m->m_next;
604                         }
605                         if (siz <= 0 || siz > NFS_MAXPACKET) {
606                                 kprintf("mbuf siz=%d\n",siz);
607                                 panic("Bad nfs svc reply");
608                         }
609                         m = mreq;
610                         m->m_pkthdr.len = siz;
611                         m->m_pkthdr.rcvif = NULL;
612                         /*
613                          * For stream protocols, prepend a Sun RPC
614                          * Record Mark.
615                          */
616                         if (sotype == SOCK_STREAM) {
617                                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
618                                 if (m == NULL)
619                                         return (ENOBUFS);
620                                 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz);
621                         }
622                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
623                                 (void) nfs_slplock(slp, 1);
624                         if (slp->ns_flag & SLP_VALID)
625                             error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL);
626                         else {
627                             error = EPIPE;
628                             m_freem(m);
629                         }
630                         if (nfsrtton)
631                                 nfsd_rt(sotype, nd, cacherep);
632                         if (nd->nd_nam2)
633                                 FREE(nd->nd_nam2, M_SONAME);
634                         if (nd->nd_mrep)
635                                 m_freem(nd->nd_mrep);
636                         if (error == EPIPE)
637                                 nfsrv_zapsock(slp);
638                         if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED)
639                                 nfs_slpunlock(slp);
640                         if (error == EINTR || error == ERESTART) {
641                                 kfree((caddr_t)nd, M_NFSRVDESC);
642                                 nfsrv_slpderef(slp);
643                                 crit_enter();
644                                 goto done;
645                         }
646                         break;
647                     case RC_DROPIT:
648                         if (nfsrtton)
649                                 nfsd_rt(sotype, nd, cacherep);
650                         m_freem(nd->nd_mrep);
651                         if (nd->nd_nam2)
652                                 FREE(nd->nd_nam2, M_SONAME);
653                         break;
654                     };
655                     if (nd) {
656                         FREE((caddr_t)nd, M_NFSRVDESC);
657                         nd = NULL;
658                     }
659
660                     /*
661                      * Check to see if there are outstanding writes that
662                      * need to be serviced.
663                      */
664                     cur_usec = nfs_curusec();
665                     crit_enter();
666                     if (slp->ns_tq.lh_first &&
667                         slp->ns_tq.lh_first->nd_time <= cur_usec) {
668                         cacherep = RC_DOIT;
669                         writes_todo = 1;
670                     } else
671                         writes_todo = 0;
672                     crit_exit();
673                 } while (writes_todo);
674                 crit_enter();
675                 if (nfsrv_dorec(slp, nfsd, &nd)) {
676                         nfsd->nfsd_flag &= ~NFSD_REQINPROG;
677                         nfsd->nfsd_slp = NULL;
678                         nfsrv_slpderef(slp);
679                 }
680         }
681 done:
682         TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
683         crit_exit();
684         kfree((caddr_t)nfsd, M_NFSD);
685         nsd->nsd_nfsd = NULL;
686         if (--nfs_numnfsd == 0)
687                 nfsrv_init(TRUE);       /* Reinitialize everything */
688         return (error);
689 }
690
691 /*
692  * Shut down a socket associated with an nfssvc_sock structure.
693  * Should be called with the send lock set, if required.
694  * The trick here is to increment the sref at the start, so that the nfsds
695  * will stop using it and clear ns_flag at the end so that it will not be
696  * reassigned during cleanup.
697  */
698 static void
699 nfsrv_zapsock(struct nfssvc_sock *slp)
700 {
701         struct nfsuid *nuidp, *nnuidp;
702         struct nfsrv_descript *nwp, *nnwp;
703         struct socket *so;
704         struct file *fp;
705         struct nfsrv_rec *rec;
706
707         slp->ns_flag &= ~SLP_ALLFLAGS;
708         fp = slp->ns_fp;
709         if (fp) {
710                 slp->ns_fp = NULL;
711                 so = slp->ns_so;
712                 so->so_rcv.ssb_flags &= ~SSB_UPCALL;
713                 so->so_upcall = NULL;
714                 so->so_upcallarg = NULL;
715                 soshutdown(so, SHUT_RDWR);
716                 closef(fp, NULL);
717                 if (slp->ns_nam)
718                         FREE(slp->ns_nam, M_SONAME);
719                 m_freem(slp->ns_raw);
720                 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) {
721                         --slp->ns_numrec;
722                         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
723                         if (rec->nr_address)
724                                 FREE(rec->nr_address, M_SONAME);
725                         m_freem(rec->nr_packet);
726                         kfree(rec, M_NFSRVDESC);
727                 }
728                 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru,
729                                       nnuidp) {
730                         LIST_REMOVE(nuidp, nu_hash);
731                         TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru);
732                         if (nuidp->nu_flag & NU_NAM)
733                                 FREE(nuidp->nu_nam, M_SONAME);
734                         kfree((caddr_t)nuidp, M_NFSUID);
735                 }
736                 crit_enter();
737                 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) {
738                         nnwp = nwp->nd_tq.le_next;
739                         LIST_REMOVE(nwp, nd_tq);
740                         kfree((caddr_t)nwp, M_NFSRVDESC);
741                 }
742                 LIST_INIT(&slp->ns_tq);
743                 crit_exit();
744         }
745 }
746
747 /*
748  * Derefence a server socket structure. If it has no more references and
749  * is no longer valid, you can throw it away.
750  */
751 void
752 nfsrv_slpderef(struct nfssvc_sock *slp)
753 {
754         if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) {
755                 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
756                 kfree((caddr_t)slp, M_NFSSVC);
757         }
758 }
759
760 /*
761  * Lock a socket against others.
762  *
763  * Returns 0 on failure, 1 on success.
764  */
765 int
766 nfs_slplock(struct nfssvc_sock *slp, int wait)
767 {
768         mtx_t mtx = &slp->ns_solock;
769
770         if (wait) {
771                 mtx_lock_ex(mtx, "nfsslplck", 0, 0);
772                 return(1);
773         } else if (mtx_lock_ex_try(mtx) == 0) {
774                 return(1);
775         } else {
776                 return(0);
777         }
778 }
779
780 /*
781  * Unlock the stream socket for others.
782  */
783 void
784 nfs_slpunlock(struct nfssvc_sock *slp)
785 {
786         mtx_t mtx = &slp->ns_solock;
787
788         mtx_unlock(mtx);
789 }
790
791 /*
792  * Initialize the data structures for the server.
793  * Handshake with any new nfsds starting up to avoid any chance of
794  * corruption.
795  */
796 void
797 nfsrv_init(int terminating)
798 {
799         struct nfssvc_sock *slp, *nslp;
800
801         if (nfssvc_sockhead_flag & SLP_INIT)
802                 panic("nfsd init");
803         nfssvc_sockhead_flag |= SLP_INIT;
804         if (terminating) {
805                 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) {
806                         if (slp->ns_flag & SLP_VALID)
807                                 nfsrv_zapsock(slp);
808                         TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain);
809                         kfree((caddr_t)slp, M_NFSSVC);
810                 }
811                 nfsrv_cleancache();     /* And clear out server cache */
812         } else
813                 nfs_pub.np_valid = 0;
814
815         TAILQ_INIT(&nfssvc_sockhead);
816         nfssvc_sockhead_flag &= ~SLP_INIT;
817         if (nfssvc_sockhead_flag & SLP_WANTINIT) {
818                 nfssvc_sockhead_flag &= ~SLP_WANTINIT;
819                 wakeup((caddr_t)&nfssvc_sockhead);
820         }
821
822         TAILQ_INIT(&nfsd_head);
823         nfsd_head_flag &= ~NFSD_CHECKSLP;
824
825 #if 0
826         nfs_udpsock = (struct nfssvc_sock *)
827             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
828         mtx_init(&nfs_udpsock->ns_solock);
829         STAILQ_INIT(&nfs_udpsock->ns_rec);
830         TAILQ_INIT(&nfs_udpsock->ns_uidlruhead);
831         TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain);
832
833         nfs_cltpsock = (struct nfssvc_sock *)
834             kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO);
835         mtx_init(&nfs_cltpsock->ns_solock);
836         STAILQ_INIT(&nfs_cltpsock->ns_rec);
837         TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead);
838         TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain);
839 #endif
840 }
841
842 /*
843  * Add entries to the server monitor log.
844  */
845 static void
846 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep)
847 {
848         struct drt *rt;
849
850         rt = &nfsdrt.drt[nfsdrt.pos];
851         if (cacherep == RC_DOIT)
852                 rt->flag = 0;
853         else if (cacherep == RC_REPLY)
854                 rt->flag = DRT_CACHEREPLY;
855         else
856                 rt->flag = DRT_CACHEDROP;
857         if (sotype == SOCK_STREAM)
858                 rt->flag |= DRT_TCP;
859         if (nd->nd_flag & ND_NFSV3)
860                 rt->flag |= DRT_NFSV3;
861         rt->proc = nd->nd_procnum;
862         if (nd->nd_nam->sa_family == AF_INET)
863             rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr;
864         else
865             rt->ipadr = INADDR_ANY;
866         rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec);
867         getmicrotime(&rt->tstamp);
868         nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ;
869 }
870 #endif /* NFS_NOSERVER */
871
872 static int nfs_defect = 0;
873 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, "");
874
875 /*
876  * Get an authorization string for the uid by having the mount_nfs sitting
877  * on this mount point porpous out of the kernel and do it.
878  */
879 int
880 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep,
881             struct ucred *cred, char **auth_str, int *auth_len, char *verf_str,
882             int *verf_len, NFSKERBKEY_T key /* return session key */)
883 {
884         int error = 0;
885
886         while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) {
887                 nmp->nm_state |= NFSSTA_WANTAUTH;
888                 (void) tsleep((caddr_t)&nmp->nm_authtype, 0,
889                         "nfsauth1", 2 * hz);
890                 error = nfs_sigintr(nmp, rep, rep->r_td);
891                 if (error) {
892                         nmp->nm_state &= ~NFSSTA_WANTAUTH;
893                         return (error);
894                 }
895         }
896         nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH);
897         nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK);
898         nmp->nm_authlen = RPCAUTH_MAXSIZ;
899         nmp->nm_verfstr = verf_str;
900         nmp->nm_verflen = *verf_len;
901         nmp->nm_authuid = cred->cr_uid;
902         wakeup((caddr_t)&nmp->nm_authstr);
903
904         /*
905          * And wait for mount_nfs to do its stuff.
906          */
907         while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) {
908                 (void) tsleep((caddr_t)&nmp->nm_authlen, 0,
909                         "nfsauth2", 2 * hz);
910                 error = nfs_sigintr(nmp, rep, rep->r_td);
911         }
912         if (nmp->nm_state & NFSSTA_AUTHERR) {
913                 nmp->nm_state &= ~NFSSTA_AUTHERR;
914                 error = EAUTH;
915         }
916         if (error)
917                 kfree((caddr_t)*auth_str, M_TEMP);
918         else {
919                 *auth_len = nmp->nm_authlen;
920                 *verf_len = nmp->nm_verflen;
921                 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key));
922         }
923         nmp->nm_state &= ~NFSSTA_HASAUTH;
924         nmp->nm_state |= NFSSTA_WAITAUTH;
925         if (nmp->nm_state & NFSSTA_WANTAUTH) {
926                 nmp->nm_state &= ~NFSSTA_WANTAUTH;
927                 wakeup((caddr_t)&nmp->nm_authtype);
928         }
929         return (error);
930 }
931
932 /*
933  * Get a nickname authenticator and verifier.
934  */
935 int
936 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str,
937                 int *auth_len, char *verf_str, int verf_len)
938 {
939         struct nfsuid *nuidp;
940         u_int32_t *nickp, *verfp;
941         struct timeval ktvin, ktvout;
942
943 #ifdef DIAGNOSTIC
944         if (verf_len < (4 * NFSX_UNSIGNED))
945                 panic("nfs_getnickauth verf too small");
946 #endif
947         for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first;
948             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
949                 if (nuidp->nu_cr.cr_uid == cred->cr_uid)
950                         break;
951         }
952         if (!nuidp || nuidp->nu_expire < time_second)
953                 return (EACCES);
954
955         /*
956          * Move to the end of the lru list (end of lru == most recently used).
957          */
958         TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru);
959         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru);
960
961         nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK);
962         *nickp++ = txdr_unsigned(RPCAKN_NICKNAME);
963         *nickp = txdr_unsigned(nuidp->nu_nickname);
964         *auth_str = (char *)nickp;
965         *auth_len = 2 * NFSX_UNSIGNED;
966
967         /*
968          * Now we must encrypt the verifier and package it up.
969          */
970         verfp = (u_int32_t *)verf_str;
971         *verfp++ = txdr_unsigned(RPCAKN_NICKNAME);
972         if (time_second > nuidp->nu_timestamp.tv_sec ||
973             (time_second == nuidp->nu_timestamp.tv_sec &&
974              time_second > nuidp->nu_timestamp.tv_usec))
975                 getmicrotime(&nuidp->nu_timestamp);
976         else
977                 nuidp->nu_timestamp.tv_usec++;
978         ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec);
979         ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec);
980
981         /*
982          * Now encrypt the timestamp verifier in ecb mode using the session
983          * key.
984          */
985 #ifdef NFSKERB
986         XXX
987 #endif
988
989         *verfp++ = ktvout.tv_sec;
990         *verfp++ = ktvout.tv_usec;
991         *verfp = 0;
992         return (0);
993 }
994
995 /*
996  * Save the current nickname in a hash list entry on the mount point.
997  */
998 int
999 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len,
1000                  NFSKERBKEY_T key, struct mbuf **mdp, char **dposp,
1001                  struct mbuf *mrep)
1002 {
1003         struct nfsuid *nuidp;
1004         u_int32_t *tl;
1005         int32_t t1;
1006         struct mbuf *md = *mdp;
1007         struct timeval ktvin, ktvout;
1008         u_int32_t nick;
1009         char *dpos = *dposp, *cp2;
1010         int deltasec, error = 0;
1011
1012         if (len == (3 * NFSX_UNSIGNED)) {
1013                 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1014                 ktvin.tv_sec = *tl++;
1015                 ktvin.tv_usec = *tl++;
1016                 nick = fxdr_unsigned(u_int32_t, *tl);
1017
1018                 /*
1019                  * Decrypt the timestamp in ecb mode.
1020                  */
1021 #ifdef NFSKERB
1022                 XXX
1023 #endif
1024                 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec);
1025                 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec);
1026                 deltasec = time_second - ktvout.tv_sec;
1027                 if (deltasec < 0)
1028                         deltasec = -deltasec;
1029                 /*
1030                  * If ok, add it to the hash list for the mount point.
1031                  */
1032                 if (deltasec <= NFS_KERBCLOCKSKEW) {
1033                         if (nmp->nm_numuids < nuidhash_max) {
1034                                 nmp->nm_numuids++;
1035                                 nuidp = (struct nfsuid *)
1036                                    kmalloc(sizeof (struct nfsuid), M_NFSUID,
1037                                         M_WAITOK);
1038                         } else {
1039                                 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead);
1040                                 LIST_REMOVE(nuidp, nu_hash);
1041                                 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp,
1042                                         nu_lru);
1043                         }
1044                         nuidp->nu_flag = 0;
1045                         nuidp->nu_cr.cr_uid = cred->cr_uid;
1046                         nuidp->nu_expire = time_second + NFS_KERBTTL;
1047                         nuidp->nu_timestamp = ktvout;
1048                         nuidp->nu_nickname = nick;
1049                         bcopy(key, nuidp->nu_key, sizeof (key));
1050                         TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp,
1051                                 nu_lru);
1052                         LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid),
1053                                 nuidp, nu_hash);
1054                 }
1055         } else
1056                 nfsm_adv(nfsm_rndup(len));
1057 nfsmout:
1058         *mdp = md;
1059         *dposp = dpos;
1060         return (error);
1061 }