AMD64 - Fix format conversions and other warnings.
[dragonfly.git] / sys / vfs / nfs / nfs_socket.c
1 /*
2  * Copyright (c) 1989, 1991, 1993, 1995
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_socket.c        8.5 (Berkeley) 3/30/95
37  * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $
38  * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.45 2007/05/18 17:05:13 dillon Exp $
39  */
40
41 /*
42  * Socket operations for use by nfs
43  */
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/proc.h>
48 #include <sys/malloc.h>
49 #include <sys/mount.h>
50 #include <sys/kernel.h>
51 #include <sys/mbuf.h>
52 #include <sys/vnode.h>
53 #include <sys/fcntl.h>
54 #include <sys/protosw.h>
55 #include <sys/resourcevar.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/socketops.h>
59 #include <sys/syslog.h>
60 #include <sys/thread.h>
61 #include <sys/tprintf.h>
62 #include <sys/sysctl.h>
63 #include <sys/signalvar.h>
64 #include <sys/mutex.h>
65
66 #include <sys/signal2.h>
67 #include <sys/mutex2.h>
68
69 #include <netinet/in.h>
70 #include <netinet/tcp.h>
71 #include <sys/thread2.h>
72
73 #include "rpcv2.h"
74 #include "nfsproto.h"
75 #include "nfs.h"
76 #include "xdr_subs.h"
77 #include "nfsm_subs.h"
78 #include "nfsmount.h"
79 #include "nfsnode.h"
80 #include "nfsrtt.h"
81
82 #define TRUE    1
83 #define FALSE   0
84
85 /*
86  * RTT calculations are scaled by 256 (8 bits).  A proper fractional
87  * RTT will still be calculated even with a slow NFS timer.
88  */
89 #define NFS_SRTT(r)     (r)->r_nmp->nm_srtt[proct[(r)->r_procnum]]
90 #define NFS_SDRTT(r)    (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum]]
91 #define NFS_RTT_SCALE_BITS      8       /* bits */
92 #define NFS_RTT_SCALE           256     /* value */
93
94 /*
95  * Defines which timer to use for the procnum.
96  * 0 - default
97  * 1 - getattr
98  * 2 - lookup
99  * 3 - read
100  * 4 - write
101  */
102 static int proct[NFS_NPROCS] = {
103         0, 1, 0, 2, 1, 3, 3, 4, 0, 0,   /* 00-09        */
104         0, 0, 0, 0, 0, 0, 3, 3, 0, 0,   /* 10-19        */
105         0, 5, 0, 0, 0, 0,               /* 20-29        */
106 };
107
108 static int multt[NFS_NPROCS] = {
109         1, 1, 1, 1, 1, 1, 1, 1, 1, 1,   /* 00-09        */
110         1, 1, 1, 1, 1, 1, 1, 1, 1, 1,   /* 10-19        */
111         1, 2, 1, 1, 1, 1,               /* 20-29        */
112 };
113
114 static int nfs_backoff[8] = { 2, 3, 5, 8, 13, 21, 34, 55 };
115 static int nfs_realign_test;
116 static int nfs_realign_count;
117 static int nfs_showrtt;
118 static int nfs_showrexmit;
119 int nfs_maxasyncbio = NFS_MAXASYNCBIO;
120
121 SYSCTL_DECL(_vfs_nfs);
122
123 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
124 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
125 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrtt, CTLFLAG_RW, &nfs_showrtt, 0, "");
126 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrexmit, CTLFLAG_RW, &nfs_showrexmit, 0, "");
127 SYSCTL_INT(_vfs_nfs, OID_AUTO, maxasyncbio, CTLFLAG_RW, &nfs_maxasyncbio, 0, "");
128
129 static int nfs_request_setup(nfsm_info_t info);
130 static int nfs_request_auth(struct nfsreq *rep);
131 static int nfs_request_try(struct nfsreq *rep);
132 static int nfs_request_waitreply(struct nfsreq *rep);
133 static int nfs_request_processreply(nfsm_info_t info, int);
134
135 int nfsrtton = 0;
136 struct nfsrtt nfsrtt;
137 struct callout  nfs_timer_handle;
138
139 static int      nfs_msg (struct thread *,char *,char *);
140 static int      nfs_rcvlock (struct nfsmount *nmp, struct nfsreq *myreq);
141 static void     nfs_rcvunlock (struct nfsmount *nmp);
142 static void     nfs_realign (struct mbuf **pm, int hsiz);
143 static int      nfs_receive (struct nfsmount *nmp, struct nfsreq *rep,
144                                 struct sockaddr **aname, struct mbuf **mp);
145 static void     nfs_softterm (struct nfsreq *rep, int islocked);
146 static void     nfs_hardterm (struct nfsreq *rep, int islocked);
147 static int      nfs_reconnect (struct nfsmount *nmp, struct nfsreq *rep);
148 #ifndef NFS_NOSERVER 
149 static int      nfsrv_getstream (struct nfssvc_sock *, int, int *);
150 static void     nfs_timer_req(struct nfsreq *req);
151
152 int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
153                                     struct nfssvc_sock *slp,
154                                     struct thread *td,
155                                     struct mbuf **mreqp) = {
156         nfsrv_null,
157         nfsrv_getattr,
158         nfsrv_setattr,
159         nfsrv_lookup,
160         nfsrv3_access,
161         nfsrv_readlink,
162         nfsrv_read,
163         nfsrv_write,
164         nfsrv_create,
165         nfsrv_mkdir,
166         nfsrv_symlink,
167         nfsrv_mknod,
168         nfsrv_remove,
169         nfsrv_rmdir,
170         nfsrv_rename,
171         nfsrv_link,
172         nfsrv_readdir,
173         nfsrv_readdirplus,
174         nfsrv_statfs,
175         nfsrv_fsinfo,
176         nfsrv_pathconf,
177         nfsrv_commit,
178         nfsrv_noop,
179         nfsrv_noop,
180         nfsrv_noop,
181         nfsrv_noop
182 };
183 #endif /* NFS_NOSERVER */
184
185 /*
186  * Initialize sockets and congestion for a new NFS connection.
187  * We do not free the sockaddr if error.
188  */
189 int
190 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
191 {
192         struct socket *so;
193         int error;
194         struct sockaddr *saddr;
195         struct sockaddr_in *sin;
196         struct thread *td = &thread0; /* only used for socreate and sobind */
197
198         nmp->nm_so = so = NULL;
199         if (nmp->nm_flag & NFSMNT_FORCE)
200                 return (EINVAL);
201         saddr = nmp->nm_nam;
202         error = socreate(saddr->sa_family, &so, nmp->nm_sotype,
203                 nmp->nm_soproto, td);
204         if (error)
205                 goto bad;
206         nmp->nm_soflags = so->so_proto->pr_flags;
207
208         /*
209          * Some servers require that the client port be a reserved port number.
210          */
211         if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
212                 struct sockopt sopt;
213                 int ip;
214                 struct sockaddr_in ssin;
215
216                 bzero(&sopt, sizeof sopt);
217                 ip = IP_PORTRANGE_LOW;
218                 sopt.sopt_level = IPPROTO_IP;
219                 sopt.sopt_name = IP_PORTRANGE;
220                 sopt.sopt_val = (void *)&ip;
221                 sopt.sopt_valsize = sizeof(ip);
222                 sopt.sopt_td = NULL;
223                 error = sosetopt(so, &sopt);
224                 if (error)
225                         goto bad;
226                 bzero(&ssin, sizeof ssin);
227                 sin = &ssin;
228                 sin->sin_len = sizeof (struct sockaddr_in);
229                 sin->sin_family = AF_INET;
230                 sin->sin_addr.s_addr = INADDR_ANY;
231                 sin->sin_port = htons(0);
232                 error = sobind(so, (struct sockaddr *)sin, td);
233                 if (error)
234                         goto bad;
235                 bzero(&sopt, sizeof sopt);
236                 ip = IP_PORTRANGE_DEFAULT;
237                 sopt.sopt_level = IPPROTO_IP;
238                 sopt.sopt_name = IP_PORTRANGE;
239                 sopt.sopt_val = (void *)&ip;
240                 sopt.sopt_valsize = sizeof(ip);
241                 sopt.sopt_td = NULL;
242                 error = sosetopt(so, &sopt);
243                 if (error)
244                         goto bad;
245         }
246
247         /*
248          * Protocols that do not require connections may be optionally left
249          * unconnected for servers that reply from a port other than NFS_PORT.
250          */
251         if (nmp->nm_flag & NFSMNT_NOCONN) {
252                 if (nmp->nm_soflags & PR_CONNREQUIRED) {
253                         error = ENOTCONN;
254                         goto bad;
255                 }
256         } else {
257                 error = soconnect(so, nmp->nm_nam, td);
258                 if (error)
259                         goto bad;
260
261                 /*
262                  * Wait for the connection to complete. Cribbed from the
263                  * connect system call but with the wait timing out so
264                  * that interruptible mounts don't hang here for a long time.
265                  */
266                 crit_enter();
267                 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
268                         (void) tsleep((caddr_t)&so->so_timeo, 0,
269                                 "nfscon", 2 * hz);
270                         if ((so->so_state & SS_ISCONNECTING) &&
271                             so->so_error == 0 && rep &&
272                             (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
273                                 so->so_state &= ~SS_ISCONNECTING;
274                                 crit_exit();
275                                 goto bad;
276                         }
277                 }
278                 if (so->so_error) {
279                         error = so->so_error;
280                         so->so_error = 0;
281                         crit_exit();
282                         goto bad;
283                 }
284                 crit_exit();
285         }
286         so->so_rcv.ssb_timeo = (5 * hz);
287         so->so_snd.ssb_timeo = (5 * hz);
288
289         /*
290          * Get buffer reservation size from sysctl, but impose reasonable
291          * limits.
292          */
293         if (nmp->nm_sotype == SOCK_STREAM) {
294                 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
295                         struct sockopt sopt;
296                         int val;
297
298                         bzero(&sopt, sizeof sopt);
299                         sopt.sopt_level = SOL_SOCKET;
300                         sopt.sopt_name = SO_KEEPALIVE;
301                         sopt.sopt_val = &val;
302                         sopt.sopt_valsize = sizeof val;
303                         val = 1;
304                         sosetopt(so, &sopt);
305                 }
306                 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
307                         struct sockopt sopt;
308                         int val;
309
310                         bzero(&sopt, sizeof sopt);
311                         sopt.sopt_level = IPPROTO_TCP;
312                         sopt.sopt_name = TCP_NODELAY;
313                         sopt.sopt_val = &val;
314                         sopt.sopt_valsize = sizeof val;
315                         val = 1;
316                         sosetopt(so, &sopt);
317                 }
318         }
319         error = soreserve(so, nfs_soreserve, nfs_soreserve, NULL);
320         if (error)
321                 goto bad;
322         so->so_rcv.ssb_flags |= SSB_NOINTR;
323         so->so_snd.ssb_flags |= SSB_NOINTR;
324
325         /* Initialize other non-zero congestion variables */
326         nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = 
327                 nmp->nm_srtt[3] = (NFS_TIMEO << NFS_RTT_SCALE_BITS);
328         nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
329                 nmp->nm_sdrtt[3] = 0;
330         nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED;
331         nmp->nm_timeouts = 0;
332
333         /*
334          * Assign nm_so last.  The moment nm_so is assigned the nfs_timer()
335          * can mess with the socket.
336          */
337         nmp->nm_so = so;
338         return (0);
339
340 bad:
341         if (so) {
342                 soshutdown(so, SHUT_RDWR);
343                 soclose(so, FNONBLOCK);
344         }
345         return (error);
346 }
347
348 /*
349  * Reconnect routine:
350  * Called when a connection is broken on a reliable protocol.
351  * - clean up the old socket
352  * - nfs_connect() again
353  * - set R_NEEDSXMIT for all outstanding requests on mount point
354  * If this fails the mount point is DEAD!
355  * nb: Must be called with the nfs_sndlock() set on the mount point.
356  */
357 static int
358 nfs_reconnect(struct nfsmount *nmp, struct nfsreq *rep)
359 {
360         struct nfsreq *req;
361         int error;
362
363         nfs_disconnect(nmp);
364         while ((error = nfs_connect(nmp, rep)) != 0) {
365                 if (error == EINTR || error == ERESTART)
366                         return (EINTR);
367                 if (error == EINVAL)
368                         return (error);
369                 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
370         }
371
372         /*
373          * Loop through outstanding request list and fix up all requests
374          * on old socket.
375          */
376         crit_enter();
377         TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
378                 KKASSERT(req->r_nmp == nmp);
379                 req->r_flags |= R_NEEDSXMIT;
380         }
381         crit_exit();
382         return (0);
383 }
384
385 /*
386  * NFS disconnect. Clean up and unlink.
387  */
388 void
389 nfs_disconnect(struct nfsmount *nmp)
390 {
391         struct socket *so;
392
393         if (nmp->nm_so) {
394                 so = nmp->nm_so;
395                 nmp->nm_so = NULL;
396                 soshutdown(so, SHUT_RDWR);
397                 soclose(so, FNONBLOCK);
398         }
399 }
400
401 void
402 nfs_safedisconnect(struct nfsmount *nmp)
403 {
404         nfs_rcvlock(nmp, NULL);
405         nfs_disconnect(nmp);
406         nfs_rcvunlock(nmp);
407 }
408
409 /*
410  * This is the nfs send routine. For connection based socket types, it
411  * must be called with an nfs_sndlock() on the socket.
412  * "rep == NULL" indicates that it has been called from a server.
413  * For the client side:
414  * - return EINTR if the RPC is terminated, 0 otherwise
415  * - set R_NEEDSXMIT if the send fails for any reason
416  * - do any cleanup required by recoverable socket errors (?)
417  * For the server side:
418  * - return EINTR or ERESTART if interrupted by a signal
419  * - return EPIPE if a connection is lost for connection based sockets (TCP...)
420  * - do any cleanup required by recoverable socket errors (?)
421  */
422 int
423 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top,
424          struct nfsreq *rep)
425 {
426         struct sockaddr *sendnam;
427         int error, soflags, flags;
428
429         if (rep) {
430                 if (rep->r_flags & R_SOFTTERM) {
431                         m_freem(top);
432                         return (EINTR);
433                 }
434                 if ((so = rep->r_nmp->nm_so) == NULL) {
435                         rep->r_flags |= R_NEEDSXMIT;
436                         m_freem(top);
437                         return (0);
438                 }
439                 rep->r_flags &= ~R_NEEDSXMIT;
440                 soflags = rep->r_nmp->nm_soflags;
441         } else {
442                 soflags = so->so_proto->pr_flags;
443         }
444         if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
445                 sendnam = NULL;
446         else
447                 sendnam = nam;
448         if (so->so_type == SOCK_SEQPACKET)
449                 flags = MSG_EOR;
450         else
451                 flags = 0;
452
453         error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags,
454             curthread /*XXX*/);
455         /*
456          * ENOBUFS for dgram sockets is transient and non fatal.
457          * No need to log, and no need to break a soft mount.
458          */
459         if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
460                 error = 0;
461                 /*
462                  * do backoff retransmit on client
463                  */
464                 if (rep) {
465                         if ((rep->r_nmp->nm_state & NFSSTA_SENDSPACE) == 0) {
466                                 rep->r_nmp->nm_state |= NFSSTA_SENDSPACE;
467                                 kprintf("Warning: NFS: Insufficient sendspace "
468                                         "(%lu),\n"
469                                         "\t You must increase vfs.nfs.soreserve"
470                                         "or decrease vfs.nfs.maxasyncbio\n",
471                                         so->so_snd.ssb_hiwat);
472                         }
473                         rep->r_flags |= R_NEEDSXMIT;
474                 }
475         }
476
477         if (error) {
478                 if (rep) {
479                         log(LOG_INFO, "nfs send error %d for server %s\n",error,
480                             rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
481                         /*
482                          * Deal with errors for the client side.
483                          */
484                         if (rep->r_flags & R_SOFTTERM)
485                                 error = EINTR;
486                         else
487                                 rep->r_flags |= R_NEEDSXMIT;
488                 } else {
489                         log(LOG_INFO, "nfsd send error %d\n", error);
490                 }
491
492                 /*
493                  * Handle any recoverable (soft) socket errors here. (?)
494                  */
495                 if (error != EINTR && error != ERESTART &&
496                         error != EWOULDBLOCK && error != EPIPE)
497                         error = 0;
498         }
499         return (error);
500 }
501
502 /*
503  * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
504  * done by soreceive(), but for SOCK_STREAM we must deal with the Record
505  * Mark and consolidate the data into a new mbuf list.
506  * nb: Sometimes TCP passes the data up to soreceive() in long lists of
507  *     small mbufs.
508  * For SOCK_STREAM we must be very careful to read an entire record once
509  * we have read any of it, even if the system call has been interrupted.
510  */
511 static int
512 nfs_receive(struct nfsmount *nmp, struct nfsreq *rep,
513             struct sockaddr **aname, struct mbuf **mp)
514 {
515         struct socket *so;
516         struct sockbuf sio;
517         struct uio auio;
518         struct iovec aio;
519         struct mbuf *m;
520         struct mbuf *control;
521         u_int32_t len;
522         struct sockaddr **getnam;
523         int error, sotype, rcvflg;
524         struct thread *td = curthread;  /* XXX */
525
526         /*
527          * Set up arguments for soreceive()
528          */
529         *mp = NULL;
530         *aname = NULL;
531         sotype = nmp->nm_sotype;
532
533         /*
534          * For reliable protocols, lock against other senders/receivers
535          * in case a reconnect is necessary.
536          * For SOCK_STREAM, first get the Record Mark to find out how much
537          * more there is to get.
538          * We must lock the socket against other receivers
539          * until we have an entire rpc request/reply.
540          */
541         if (sotype != SOCK_DGRAM) {
542                 error = nfs_sndlock(nmp, rep);
543                 if (error)
544                         return (error);
545 tryagain:
546                 /*
547                  * Check for fatal errors and resending request.
548                  */
549                 /*
550                  * Ugh: If a reconnect attempt just happened, nm_so
551                  * would have changed. NULL indicates a failed
552                  * attempt that has essentially shut down this
553                  * mount point.
554                  */
555                 if (rep && (rep->r_mrep || (rep->r_flags & R_SOFTTERM))) {
556                         nfs_sndunlock(nmp);
557                         return (EINTR);
558                 }
559                 so = nmp->nm_so;
560                 if (so == NULL) {
561                         error = nfs_reconnect(nmp, rep);
562                         if (error) {
563                                 nfs_sndunlock(nmp);
564                                 return (error);
565                         }
566                         goto tryagain;
567                 }
568                 while (rep && (rep->r_flags & R_NEEDSXMIT)) {
569                         m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT);
570                         nfsstats.rpcretries++;
571                         error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
572                         if (error) {
573                                 if (error == EINTR || error == ERESTART ||
574                                     (error = nfs_reconnect(nmp, rep)) != 0) {
575                                         nfs_sndunlock(nmp);
576                                         return (error);
577                                 }
578                                 goto tryagain;
579                         }
580                 }
581                 nfs_sndunlock(nmp);
582                 if (sotype == SOCK_STREAM) {
583                         /*
584                          * Get the length marker from the stream
585                          */
586                         aio.iov_base = (caddr_t)&len;
587                         aio.iov_len = sizeof(u_int32_t);
588                         auio.uio_iov = &aio;
589                         auio.uio_iovcnt = 1;
590                         auio.uio_segflg = UIO_SYSSPACE;
591                         auio.uio_rw = UIO_READ;
592                         auio.uio_offset = 0;
593                         auio.uio_resid = sizeof(u_int32_t);
594                         auio.uio_td = td;
595                         do {
596                            rcvflg = MSG_WAITALL;
597                            error = so_pru_soreceive(so, NULL, &auio, NULL,
598                                                     NULL, &rcvflg);
599                            if (error == EWOULDBLOCK && rep) {
600                                 if (rep->r_flags & R_SOFTTERM)
601                                         return (EINTR);
602                            }
603                         } while (error == EWOULDBLOCK);
604
605                         if (error == 0 && auio.uio_resid > 0) {
606                             /*
607                              * Only log short packets if not EOF
608                              */
609                             if (auio.uio_resid != sizeof(u_int32_t))
610                             log(LOG_INFO,
611                                  "short receive (%d/%d) from nfs server %s\n",
612                                  (int)(sizeof(u_int32_t) - auio.uio_resid),
613                                  (int)sizeof(u_int32_t),
614                                  nmp->nm_mountp->mnt_stat.f_mntfromname);
615                             error = EPIPE;
616                         }
617                         if (error)
618                                 goto errout;
619                         len = ntohl(len) & ~0x80000000;
620                         /*
621                          * This is SERIOUS! We are out of sync with the sender
622                          * and forcing a disconnect/reconnect is all I can do.
623                          */
624                         if (len > NFS_MAXPACKET) {
625                             log(LOG_ERR, "%s (%d) from nfs server %s\n",
626                                 "impossible packet length",
627                                 len,
628                                 nmp->nm_mountp->mnt_stat.f_mntfromname);
629                             error = EFBIG;
630                             goto errout;
631                         }
632
633                         /*
634                          * Get the rest of the packet as an mbuf chain
635                          */
636                         sbinit(&sio, len);
637                         do {
638                             rcvflg = MSG_WAITALL;
639                             error = so_pru_soreceive(so, NULL, NULL, &sio,
640                                                      NULL, &rcvflg);
641                         } while (error == EWOULDBLOCK || error == EINTR ||
642                                  error == ERESTART);
643                         if (error == 0 && sio.sb_cc != len) {
644                             if (sio.sb_cc != 0)
645                             log(LOG_INFO,
646                                 "short receive (%zu/%d) from nfs server %s\n",
647                                 (size_t)len - auio.uio_resid, len,
648                                 nmp->nm_mountp->mnt_stat.f_mntfromname);
649                             error = EPIPE;
650                         }
651                         *mp = sio.sb_mb;
652                 } else {
653                         /*
654                          * Non-stream, so get the whole packet by not
655                          * specifying MSG_WAITALL and by specifying a large
656                          * length.
657                          *
658                          * We have no use for control msg., but must grab them
659                          * and then throw them away so we know what is going
660                          * on.
661                          */
662                         sbinit(&sio, 100000000);
663                         do {
664                             rcvflg = 0;
665                             error =  so_pru_soreceive(so, NULL, NULL, &sio,
666                                                       &control, &rcvflg);
667                             if (control)
668                                 m_freem(control);
669                             if (error == EWOULDBLOCK && rep) {
670                                 if (rep->r_flags & R_SOFTTERM) {
671                                         m_freem(sio.sb_mb);
672                                         return (EINTR);
673                                 }
674                             }
675                         } while (error == EWOULDBLOCK ||
676                                  (error == 0 && sio.sb_mb == NULL && control));
677                         if ((rcvflg & MSG_EOR) == 0)
678                                 kprintf("Egad!!\n");
679                         if (error == 0 && sio.sb_mb == NULL)
680                                 error = EPIPE;
681                         len = sio.sb_cc;
682                         *mp = sio.sb_mb;
683                 }
684 errout:
685                 if (error && error != EINTR && error != ERESTART) {
686                         m_freem(*mp);
687                         *mp = NULL;
688                         if (error != EPIPE) {
689                                 log(LOG_INFO,
690                                     "receive error %d from nfs server %s\n",
691                                     error,
692                                  nmp->nm_mountp->mnt_stat.f_mntfromname);
693                         }
694                         error = nfs_sndlock(nmp, rep);
695                         if (!error) {
696                                 error = nfs_reconnect(nmp, rep);
697                                 if (!error)
698                                         goto tryagain;
699                                 else
700                                         nfs_sndunlock(nmp);
701                         }
702                 }
703         } else {
704                 if ((so = nmp->nm_so) == NULL)
705                         return (EACCES);
706                 if (so->so_state & SS_ISCONNECTED)
707                         getnam = NULL;
708                 else
709                         getnam = aname;
710                 sbinit(&sio, 100000000);
711                 do {
712                         rcvflg = 0;
713                         error =  so_pru_soreceive(so, getnam, NULL, &sio,
714                                                   NULL, &rcvflg);
715                         if (error == EWOULDBLOCK && rep &&
716                             (rep->r_flags & R_SOFTTERM)) {
717                                 m_freem(sio.sb_mb);
718                                 return (EINTR);
719                         }
720                 } while (error == EWOULDBLOCK);
721
722                 len = sio.sb_cc;
723                 *mp = sio.sb_mb;
724
725                 /*
726                  * A shutdown may result in no error and no mbuf.
727                  * Convert to EPIPE.
728                  */
729                 if (*mp == NULL && error == 0)
730                         error = EPIPE;
731         }
732         if (error) {
733                 m_freem(*mp);
734                 *mp = NULL;
735         }
736
737         /*
738          * Search for any mbufs that are not a multiple of 4 bytes long
739          * or with m_data not longword aligned.
740          * These could cause pointer alignment problems, so copy them to
741          * well aligned mbufs.
742          */
743         nfs_realign(mp, 5 * NFSX_UNSIGNED);
744         return (error);
745 }
746
747 /*
748  * Implement receipt of reply on a socket.
749  *
750  * We must search through the list of received datagrams matching them
751  * with outstanding requests using the xid, until ours is found.
752  *
753  * If myrep is NULL we process packets on the socket until
754  * interrupted or until nm_reqrxq is non-empty.
755  */
756 /* ARGSUSED */
757 int
758 nfs_reply(struct nfsmount *nmp, struct nfsreq *myrep)
759 {
760         struct nfsreq *rep;
761         struct sockaddr *nam;
762         u_int32_t rxid;
763         u_int32_t *tl;
764         int error;
765         struct nfsm_info info;
766
767         /*
768          * Loop around until we get our own reply
769          */
770         for (;;) {
771                 /*
772                  * Lock against other receivers so that I don't get stuck in
773                  * sbwait() after someone else has received my reply for me.
774                  * Also necessary for connection based protocols to avoid
775                  * race conditions during a reconnect.
776                  *
777                  * If nfs_rcvlock() returns EALREADY, that means that
778                  * the reply has already been recieved by another
779                  * process and we can return immediately.  In this
780                  * case, the lock is not taken to avoid races with
781                  * other processes.
782                  */
783                 info.mrep = NULL;
784
785                 error = nfs_rcvlock(nmp, myrep);
786                 if (error == EALREADY)
787                         return (0);
788                 if (error)
789                         return (error);
790
791                 /*
792                  * If myrep is NULL we are the receiver helper thread.
793                  * Stop waiting for incoming replies if there are
794                  * messages sitting on reqrxq that we need to process,
795                  * or if a shutdown request is pending.
796                  */
797                 if (myrep == NULL && (TAILQ_FIRST(&nmp->nm_reqrxq) ||
798                     nmp->nm_rxstate > NFSSVC_PENDING)) {
799                         nfs_rcvunlock(nmp);
800                         return(EWOULDBLOCK);
801                 }
802
803                 /*
804                  * Get the next Rpc reply off the socket
805                  *
806                  * We cannot release the receive lock until we've
807                  * filled in rep->r_mrep, otherwise a waiting
808                  * thread may deadlock in soreceive with no incoming
809                  * packets expected.
810                  */
811                 error = nfs_receive(nmp, myrep, &nam, &info.mrep);
812                 if (error) {
813                         /*
814                          * Ignore routing errors on connectionless protocols??
815                          */
816                         nfs_rcvunlock(nmp);
817                         if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
818                                 if (nmp->nm_so == NULL)
819                                         return (error);
820                                 nmp->nm_so->so_error = 0;
821                                 continue;
822                         }
823                         return (error);
824                 }
825                 if (nam)
826                         FREE(nam, M_SONAME);
827
828                 /*
829                  * Get the xid and check that it is an rpc reply
830                  */
831                 info.md = info.mrep;
832                 info.dpos = mtod(info.md, caddr_t);
833                 NULLOUT(tl = nfsm_dissect(&info, 2*NFSX_UNSIGNED));
834                 rxid = *tl++;
835                 if (*tl != rpc_reply) {
836                         nfsstats.rpcinvalid++;
837                         m_freem(info.mrep);
838                         info.mrep = NULL;
839 nfsmout:
840                         nfs_rcvunlock(nmp);
841                         continue;
842                 }
843
844                 /*
845                  * Loop through the request list to match up the reply
846                  * Iff no match, just drop the datagram.  On match, set
847                  * r_mrep atomically to prevent the timer from messing
848                  * around with the request after we have exited the critical
849                  * section.
850                  */
851                 crit_enter();
852                 TAILQ_FOREACH(rep, &nmp->nm_reqq, r_chain) {
853                         if (rep->r_mrep == NULL && rxid == rep->r_xid)
854                                 break;
855                 }
856
857                 /*
858                  * Fill in the rest of the reply if we found a match.
859                  *
860                  * Deal with duplicate responses if there was no match.
861                  */
862                 if (rep) {
863                         rep->r_md = info.md;
864                         rep->r_dpos = info.dpos;
865                         if (nfsrtton) {
866                                 struct rttl *rt;
867
868                                 rt = &nfsrtt.rttl[nfsrtt.pos];
869                                 rt->proc = rep->r_procnum;
870                                 rt->rto = 0;
871                                 rt->sent = 0;
872                                 rt->cwnd = nmp->nm_maxasync_scaled;
873                                 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
874                                 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
875                                 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
876                                 getmicrotime(&rt->tstamp);
877                                 if (rep->r_flags & R_TIMING)
878                                         rt->rtt = rep->r_rtt;
879                                 else
880                                         rt->rtt = 1000000;
881                                 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
882                         }
883
884                         /*
885                          * New congestion control is based only on async
886                          * requests.
887                          */
888                         if (nmp->nm_maxasync_scaled < NFS_MAXASYNC_SCALED)
889                                 ++nmp->nm_maxasync_scaled;
890                         if (rep->r_flags & R_SENT) {
891                                 rep->r_flags &= ~R_SENT;
892                         }
893                         /*
894                          * Update rtt using a gain of 0.125 on the mean
895                          * and a gain of 0.25 on the deviation.
896                          *
897                          * NOTE SRTT/SDRTT are only good if R_TIMING is set.
898                          */
899                         if ((rep->r_flags & R_TIMING) && rep->r_rexmit == 0) {
900                                 /*
901                                  * Since the timer resolution of
902                                  * NFS_HZ is so course, it can often
903                                  * result in r_rtt == 0. Since
904                                  * r_rtt == N means that the actual
905                                  * rtt is between N+dt and N+2-dt ticks,
906                                  * add 1.
907                                  */
908                                 int n;
909                                 int d;
910
911 #define NFSRSB  NFS_RTT_SCALE_BITS
912                                 n = ((NFS_SRTT(rep) * 7) +
913                                      (rep->r_rtt << NFSRSB)) >> 3;
914                                 d = n - NFS_SRTT(rep);
915                                 NFS_SRTT(rep) = n;
916
917                                 /*
918                                  * Don't let the jitter calculation decay
919                                  * too quickly, but we want a fast rampup.
920                                  */
921                                 if (d < 0)
922                                         d = -d;
923                                 d <<= NFSRSB;
924                                 if (d < NFS_SDRTT(rep))
925                                         n = ((NFS_SDRTT(rep) * 15) + d) >> 4;
926                                 else
927                                         n = ((NFS_SDRTT(rep) * 3) + d) >> 2;
928                                 NFS_SDRTT(rep) = n;
929 #undef NFSRSB
930                         }
931                         nmp->nm_timeouts = 0;
932                         rep->r_mrep = info.mrep;
933                         nfs_hardterm(rep, 0);
934                 } else {
935                         /*
936                          * Extract vers, prog, nfsver, procnum.  A duplicate
937                          * response means we didn't wait long enough so
938                          * we increase the SRTT to avoid future spurious
939                          * timeouts.
940                          */
941                         u_int procnum = nmp->nm_lastreprocnum;
942                         int n;
943
944                         if (procnum < NFS_NPROCS && proct[procnum]) {
945                                 if (nfs_showrexmit)
946                                         kprintf("D");
947                                 n = nmp->nm_srtt[proct[procnum]];
948                                 n += NFS_ASYSCALE * NFS_HZ;
949                                 if (n < NFS_ASYSCALE * NFS_HZ * 10)
950                                         n = NFS_ASYSCALE * NFS_HZ * 10;
951                                 nmp->nm_srtt[proct[procnum]] = n;
952                         }
953                 }
954                 nfs_rcvunlock(nmp);
955                 crit_exit();
956
957                 /*
958                  * If not matched to a request, drop it.
959                  * If it's mine, get out.
960                  */
961                 if (rep == NULL) {
962                         nfsstats.rpcunexpected++;
963                         m_freem(info.mrep);
964                         info.mrep = NULL;
965                 } else if (rep == myrep) {
966                         if (rep->r_mrep == NULL)
967                                 panic("nfsreply nil");
968                         return (0);
969                 }
970         }
971 }
972
973 /*
974  * Run the request state machine until the target state is reached
975  * or a fatal error occurs.  The target state is not run.  Specifying
976  * a target of NFSM_STATE_DONE runs the state machine until the rpc
977  * is complete.
978  *
979  * EINPROGRESS is returned for all states other then the DONE state,
980  * indicating that the rpc is still in progress.
981  */
982 int
983 nfs_request(struct nfsm_info *info, nfsm_state_t bstate, nfsm_state_t estate)
984 {
985         struct nfsreq *req;
986
987         while (info->state >= bstate && info->state < estate) {
988                 switch(info->state) {
989                 case NFSM_STATE_SETUP:
990                         /*
991                          * Setup the nfsreq.  Any error which occurs during
992                          * this state is fatal.
993                          */
994                         info->error = nfs_request_setup(info);
995                         if (info->error) {
996                                 info->state = NFSM_STATE_DONE;
997                                 return (info->error);
998                         } else {
999                                 req = info->req;
1000                                 req->r_mrp = &info->mrep;
1001                                 req->r_mdp = &info->md;
1002                                 req->r_dposp = &info->dpos;
1003                                 info->state = NFSM_STATE_AUTH;
1004                         }
1005                         break;
1006                 case NFSM_STATE_AUTH:
1007                         /*
1008                          * Authenticate the nfsreq.  Any error which occurs
1009                          * during this state is fatal.
1010                          */
1011                         info->error = nfs_request_auth(info->req);
1012                         if (info->error) {
1013                                 info->state = NFSM_STATE_DONE;
1014                                 return (info->error);
1015                         } else {
1016                                 info->state = NFSM_STATE_TRY;
1017                         }
1018                         break;
1019                 case NFSM_STATE_TRY:
1020                         /*
1021                          * Transmit or retransmit attempt.  An error in this
1022                          * state is ignored and we always move on to the
1023                          * next state.
1024                          *
1025                          * This can trivially race the receiver if the
1026                          * request is asynchronous.  nfs_request_try()
1027                          * will thus set the state for us and we
1028                          * must also return immediately if we are
1029                          * running an async state machine, because
1030                          * info can become invalid due to races after
1031                          * try() returns.
1032                          */
1033                         if (info->req->r_flags & R_ASYNC) {
1034                                 nfs_request_try(info->req);
1035                                 if (estate == NFSM_STATE_WAITREPLY)
1036                                         return (EINPROGRESS);
1037                         } else {
1038                                 nfs_request_try(info->req);
1039                                 info->state = NFSM_STATE_WAITREPLY;
1040                         }
1041                         break;
1042                 case NFSM_STATE_WAITREPLY:
1043                         /*
1044                          * Wait for a reply or timeout and move on to the
1045                          * next state.  The error returned by this state
1046                          * is passed to the processing code in the next
1047                          * state.
1048                          */
1049                         info->error = nfs_request_waitreply(info->req);
1050                         info->state = NFSM_STATE_PROCESSREPLY;
1051                         break;
1052                 case NFSM_STATE_PROCESSREPLY:
1053                         /*
1054                          * Process the reply or timeout.  Errors which occur
1055                          * in this state may cause the state machine to
1056                          * go back to an earlier state, and are fatal
1057                          * otherwise.
1058                          */
1059                         info->error = nfs_request_processreply(info,
1060                                                                info->error);
1061                         switch(info->error) {
1062                         case ENEEDAUTH:
1063                                 info->state = NFSM_STATE_AUTH;
1064                                 break;
1065                         case EAGAIN:
1066                                 info->state = NFSM_STATE_TRY;
1067                                 break;
1068                         default:
1069                                 /*
1070                                  * Operation complete, with or without an
1071                                  * error.  We are done.
1072                                  */
1073                                 info->req = NULL;
1074                                 info->state = NFSM_STATE_DONE;
1075                                 return (info->error);
1076                         }
1077                         break;
1078                 case NFSM_STATE_DONE:
1079                         /*
1080                          * Shouldn't be reached
1081                          */
1082                         return (info->error);
1083                         /* NOT REACHED */
1084                 }
1085         }
1086
1087         /*
1088          * If we are done return the error code (if any).
1089          * Otherwise return EINPROGRESS.
1090          */
1091         if (info->state == NFSM_STATE_DONE)
1092                 return (info->error);
1093         return (EINPROGRESS);
1094 }
1095
1096 /*
1097  * nfs_request - goes something like this
1098  *      - fill in request struct
1099  *      - links it into list
1100  *      - calls nfs_send() for first transmit
1101  *      - calls nfs_receive() to get reply
1102  *      - break down rpc header and return with nfs reply pointed to
1103  *        by mrep or error
1104  * nb: always frees up mreq mbuf list
1105  */
1106 static int
1107 nfs_request_setup(nfsm_info_t info)
1108 {
1109         struct nfsreq *req;
1110         struct nfsmount *nmp;
1111         struct mbuf *m;
1112         int i;
1113
1114         /*
1115          * Reject requests while attempting a forced unmount.
1116          */
1117         if (info->vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
1118                 m_freem(info->mreq);
1119                 info->mreq = NULL;
1120                 return (ESTALE);
1121         }
1122         nmp = VFSTONFS(info->vp->v_mount);
1123         req = kmalloc(sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
1124         req->r_nmp = nmp;
1125         req->r_vp = info->vp;
1126         req->r_td = info->td;
1127         req->r_procnum = info->procnum;
1128         req->r_mreq = NULL;
1129         req->r_cred = info->cred;
1130
1131         i = 0;
1132         m = info->mreq;
1133         while (m) {
1134                 i += m->m_len;
1135                 m = m->m_next;
1136         }
1137         req->r_mrest = info->mreq;
1138         req->r_mrest_len = i;
1139
1140         /*
1141          * The presence of a non-NULL r_info in req indicates
1142          * async completion via our helper threads.  See the receiver
1143          * code.
1144          */
1145         if (info->bio) {
1146                 req->r_info = info;
1147                 req->r_flags = R_ASYNC;
1148         } else {
1149                 req->r_info = NULL;
1150                 req->r_flags = 0;
1151         }
1152         info->req = req;
1153         return(0);
1154 }
1155
1156 static int
1157 nfs_request_auth(struct nfsreq *rep)
1158 {
1159         struct nfsmount *nmp = rep->r_nmp;
1160         struct mbuf *m;
1161         char nickv[RPCX_NICKVERF];
1162         int error = 0, auth_len, auth_type;
1163         int verf_len;
1164         u_int32_t xid;
1165         char *auth_str, *verf_str;
1166         struct ucred *cred;
1167
1168         cred = rep->r_cred;
1169         rep->r_failed_auth = 0;
1170
1171         /*
1172          * Get the RPC header with authorization.
1173          */
1174         verf_str = auth_str = NULL;
1175         if (nmp->nm_flag & NFSMNT_KERB) {
1176                 verf_str = nickv;
1177                 verf_len = sizeof (nickv);
1178                 auth_type = RPCAUTH_KERB4;
1179                 bzero((caddr_t)rep->r_key, sizeof(rep->r_key));
1180                 if (rep->r_failed_auth ||
1181                     nfs_getnickauth(nmp, cred, &auth_str, &auth_len,
1182                                     verf_str, verf_len)) {
1183                         error = nfs_getauth(nmp, rep, cred, &auth_str,
1184                                 &auth_len, verf_str, &verf_len, rep->r_key);
1185                         if (error) {
1186                                 m_freem(rep->r_mrest);
1187                                 rep->r_mrest = NULL;
1188                                 kfree((caddr_t)rep, M_NFSREQ);
1189                                 return (error);
1190                         }
1191                 }
1192         } else {
1193                 auth_type = RPCAUTH_UNIX;
1194                 if (cred->cr_ngroups < 1)
1195                         panic("nfsreq nogrps");
1196                 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
1197                         nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
1198                         5 * NFSX_UNSIGNED;
1199         }
1200         m = nfsm_rpchead(cred, nmp->nm_flag, rep->r_procnum, auth_type,
1201                         auth_len, auth_str, verf_len, verf_str,
1202                         rep->r_mrest, rep->r_mrest_len, &rep->r_mheadend, &xid);
1203         rep->r_mrest = NULL;
1204         if (auth_str)
1205                 kfree(auth_str, M_TEMP);
1206
1207         /*
1208          * For stream protocols, insert a Sun RPC Record Mark.
1209          */
1210         if (nmp->nm_sotype == SOCK_STREAM) {
1211                 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
1212                 if (m == NULL) {
1213                         kfree(rep, M_NFSREQ);
1214                         return (ENOBUFS);
1215                 }
1216                 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1217                          (m->m_pkthdr.len - NFSX_UNSIGNED));
1218         }
1219         rep->r_mreq = m;
1220         rep->r_xid = xid;
1221         return (0);
1222 }
1223
1224 static int
1225 nfs_request_try(struct nfsreq *rep)
1226 {
1227         struct nfsmount *nmp = rep->r_nmp;
1228         struct mbuf *m2;
1229         int error;
1230
1231         /*
1232          * Request is not on any queue, only the owner has access to it
1233          * so it should not be locked by anyone atm.
1234          *
1235          * Interlock to prevent races.  While locked the only remote
1236          * action possible is for r_mrep to be set (once we enqueue it).
1237          */
1238         if (rep->r_flags == 0xdeadc0de) {
1239                 print_backtrace();
1240                 panic("flags nbad\n");
1241         }
1242         KKASSERT((rep->r_flags & (R_LOCKED | R_ONREQQ)) == 0);
1243         if (nmp->nm_flag & NFSMNT_SOFT)
1244                 rep->r_retry = nmp->nm_retry;
1245         else
1246                 rep->r_retry = NFS_MAXREXMIT + 1;       /* past clip limit */
1247         rep->r_rtt = rep->r_rexmit = 0;
1248         if (proct[rep->r_procnum] > 0)
1249                 rep->r_flags |= R_TIMING | R_LOCKED;
1250         else
1251                 rep->r_flags |= R_LOCKED;
1252         rep->r_mrep = NULL;
1253
1254         /*
1255          * Do the client side RPC.
1256          */
1257         nfsstats.rpcrequests++;
1258
1259         if (nmp->nm_flag & NFSMNT_FORCE) {
1260                 rep->r_flags |= R_SOFTTERM;
1261                 rep->r_flags &= ~R_LOCKED;
1262                 return (0);
1263         }
1264
1265         /*
1266          * Chain request into list of outstanding requests. Be sure
1267          * to put it LAST so timer finds oldest requests first.  Note
1268          * that our control of R_LOCKED prevents the request from
1269          * getting ripped out from under us or transmitted by the
1270          * timer code.
1271          *
1272          * For requests with info structures we must atomically set the
1273          * info's state because the structure could become invalid upon
1274          * return due to races (i.e., if async)
1275          */
1276         crit_enter();
1277         mtx_link_init(&rep->r_link);
1278         TAILQ_INSERT_TAIL(&nmp->nm_reqq, rep, r_chain);
1279         rep->r_flags |= R_ONREQQ;
1280         ++nmp->nm_reqqlen;
1281         if (rep->r_flags & R_ASYNC)
1282                 rep->r_info->state = NFSM_STATE_WAITREPLY;
1283         crit_exit();
1284
1285         error = 0;
1286
1287         /*
1288          * Send if we can.  Congestion control is not handled here any more
1289          * becausing trying to defer the initial send based on the nfs_timer
1290          * requires having a very fast nfs_timer, which is silly.
1291          */
1292         if (nmp->nm_so) {
1293                 if (nmp->nm_soflags & PR_CONNREQUIRED)
1294                         error = nfs_sndlock(nmp, rep);
1295                 if (error == 0) {
1296                         m2 = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT);
1297                         error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1298                         if (nmp->nm_soflags & PR_CONNREQUIRED)
1299                                 nfs_sndunlock(nmp);
1300                         rep->r_flags &= ~R_NEEDSXMIT;
1301                         if ((rep->r_flags & R_SENT) == 0) {
1302                                 rep->r_flags |= R_SENT;
1303                         }
1304                 } else {
1305                         rep->r_flags |= R_NEEDSXMIT;
1306                 }
1307         } else {
1308                 rep->r_flags |= R_NEEDSXMIT;
1309                 rep->r_rtt = -1;
1310         }
1311         if (error == EPIPE)
1312                 error = 0;
1313
1314         /*
1315          * Release the lock.  The only remote action that may have occurred
1316          * would have been the setting of rep->r_mrep.  If this occured
1317          * and the request was async we have to move it to the reader
1318          * thread's queue for action.
1319          *
1320          * For async requests also make sure the reader is woken up so
1321          * it gets on the socket to read responses.
1322          */
1323         crit_enter();
1324         if (rep->r_flags & R_ASYNC) {
1325                 if (rep->r_mrep)
1326                         nfs_hardterm(rep, 1);
1327                 rep->r_flags &= ~R_LOCKED;
1328                 nfssvc_iod_reader_wakeup(nmp);
1329         } else {
1330                 rep->r_flags &= ~R_LOCKED;
1331         }
1332         if (rep->r_flags & R_WANTED) {
1333                 rep->r_flags &= ~R_WANTED;
1334                 wakeup(rep);
1335         }
1336         crit_exit();
1337         return (error);
1338 }
1339
1340 /*
1341  * This code is only called for synchronous requests.  Completed synchronous
1342  * requests are left on reqq and we remove them before moving on to the
1343  * processing state.
1344  */
1345 static int
1346 nfs_request_waitreply(struct nfsreq *rep)
1347 {
1348         struct nfsmount *nmp = rep->r_nmp;
1349         int error;
1350
1351         KKASSERT((rep->r_flags & R_ASYNC) == 0);
1352
1353         /*
1354          * Wait until the request is finished.
1355          */
1356         error = nfs_reply(nmp, rep);
1357
1358         /*
1359          * RPC done, unlink the request, but don't rip it out from under
1360          * the callout timer.
1361          *
1362          * Once unlinked no other receiver or the timer will have
1363          * visibility, so we do not have to set R_LOCKED.
1364          */
1365         crit_enter();
1366         while (rep->r_flags & R_LOCKED) {
1367                 rep->r_flags |= R_WANTED;
1368                 tsleep(rep, 0, "nfstrac", 0);
1369         }
1370         KKASSERT(rep->r_flags & R_ONREQQ);
1371         TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain);
1372         rep->r_flags &= ~R_ONREQQ;
1373         --nmp->nm_reqqlen;
1374         if (TAILQ_FIRST(&nmp->nm_bioq) &&
1375             nmp->nm_reqqlen == NFS_MAXASYNCBIO * 2 / 3) {
1376                 nfssvc_iod_writer_wakeup(nmp);
1377         }
1378         crit_exit();
1379
1380         /*
1381          * Decrement the outstanding request count.
1382          */
1383         if (rep->r_flags & R_SENT) {
1384                 rep->r_flags &= ~R_SENT;
1385         }
1386         return (error);
1387 }
1388
1389 /*
1390  * Process reply with error returned from nfs_requet_waitreply().
1391  *
1392  * Returns EAGAIN if it wants us to loop up to nfs_request_try() again.
1393  * Returns ENEEDAUTH if it wants us to loop up to nfs_request_auth() again.
1394  */
1395 static int
1396 nfs_request_processreply(nfsm_info_t info, int error)
1397 {
1398         struct nfsreq *req = info->req;
1399         struct nfsmount *nmp = req->r_nmp;
1400         u_int32_t *tl;
1401         int verf_type;
1402         int i;
1403
1404         /*
1405          * If there was a successful reply and a tprintf msg.
1406          * tprintf a response.
1407          */
1408         if (error == 0 && (req->r_flags & R_TPRINTFMSG)) {
1409                 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1410                     "is alive again");
1411         }
1412         info->mrep = req->r_mrep;
1413         info->md = req->r_md;
1414         info->dpos = req->r_dpos;
1415         if (error) {
1416                 m_freem(req->r_mreq);
1417                 req->r_mreq = NULL;
1418                 kfree(req, M_NFSREQ);
1419                 info->req = NULL;
1420                 return (error);
1421         }
1422
1423         /*
1424          * break down the rpc header and check if ok
1425          */
1426         NULLOUT(tl = nfsm_dissect(info, 3 * NFSX_UNSIGNED));
1427         if (*tl++ == rpc_msgdenied) {
1428                 if (*tl == rpc_mismatch) {
1429                         error = EOPNOTSUPP;
1430                 } else if ((nmp->nm_flag & NFSMNT_KERB) &&
1431                            *tl++ == rpc_autherr) {
1432                         if (req->r_failed_auth == 0) {
1433                                 req->r_failed_auth++;
1434                                 req->r_mheadend->m_next = NULL;
1435                                 m_freem(info->mrep);
1436                                 info->mrep = NULL;
1437                                 m_freem(req->r_mreq);
1438                                 return (ENEEDAUTH);
1439                         } else {
1440                                 error = EAUTH;
1441                         }
1442                 } else {
1443                         error = EACCES;
1444                 }
1445                 m_freem(info->mrep);
1446                 info->mrep = NULL;
1447                 m_freem(req->r_mreq);
1448                 req->r_mreq = NULL;
1449                 kfree(req, M_NFSREQ);
1450                 info->req = NULL;
1451                 return (error);
1452         }
1453
1454         /*
1455          * Grab any Kerberos verifier, otherwise just throw it away.
1456          */
1457         verf_type = fxdr_unsigned(int, *tl++);
1458         i = fxdr_unsigned(int32_t, *tl);
1459         if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1460                 error = nfs_savenickauth(nmp, req->r_cred, i, req->r_key,
1461                                          &info->md, &info->dpos, info->mrep);
1462                 if (error)
1463                         goto nfsmout;
1464         } else if (i > 0) {
1465                 ERROROUT(nfsm_adv(info, nfsm_rndup(i)));
1466         }
1467         NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED));
1468         /* 0 == ok */
1469         if (*tl == 0) {
1470                 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED));
1471                 if (*tl != 0) {
1472                         error = fxdr_unsigned(int, *tl);
1473
1474                         /*
1475                          * Does anyone even implement this?  Just impose
1476                          * a 1-second delay.
1477                          */
1478                         if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1479                                 error == NFSERR_TRYLATER) {
1480                                 m_freem(info->mrep);
1481                                 info->mrep = NULL;
1482                                 error = 0;
1483
1484                                 tsleep((caddr_t)&lbolt, 0, "nqnfstry", 0);
1485                                 return (EAGAIN);        /* goto tryagain */
1486                         }
1487
1488                         /*
1489                          * If the File Handle was stale, invalidate the
1490                          * lookup cache, just in case.
1491                          *
1492                          * To avoid namecache<->vnode deadlocks we must
1493                          * release the vnode lock if we hold it.
1494                          */
1495                         if (error == ESTALE) {
1496                                 struct vnode *vp = req->r_vp;
1497                                 int ltype;
1498
1499                                 ltype = lockstatus(&vp->v_lock, curthread);
1500                                 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED)
1501                                         lockmgr(&vp->v_lock, LK_RELEASE);
1502                                 cache_inval_vp(vp, CINV_CHILDREN);
1503                                 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED)
1504                                         lockmgr(&vp->v_lock, ltype);
1505                         }
1506                         if (nmp->nm_flag & NFSMNT_NFSV3) {
1507                                 KKASSERT(*req->r_mrp == info->mrep);
1508                                 KKASSERT(*req->r_mdp == info->md);
1509                                 KKASSERT(*req->r_dposp == info->dpos);
1510                                 error |= NFSERR_RETERR;
1511                         } else {
1512                                 m_freem(info->mrep);
1513                                 info->mrep = NULL;
1514                         }
1515                         m_freem(req->r_mreq);
1516                         req->r_mreq = NULL;
1517                         kfree(req, M_NFSREQ);
1518                         info->req = NULL;
1519                         return (error);
1520                 }
1521
1522                 KKASSERT(*req->r_mrp == info->mrep);
1523                 KKASSERT(*req->r_mdp == info->md);
1524                 KKASSERT(*req->r_dposp == info->dpos);
1525                 m_freem(req->r_mreq);
1526                 req->r_mreq = NULL;
1527                 FREE(req, M_NFSREQ);
1528                 return (0);
1529         }
1530         m_freem(info->mrep);
1531         info->mrep = NULL;
1532         error = EPROTONOSUPPORT;
1533 nfsmout:
1534         m_freem(req->r_mreq);
1535         req->r_mreq = NULL;
1536         kfree(req, M_NFSREQ);
1537         info->req = NULL;
1538         return (error);
1539 }
1540
1541 #ifndef NFS_NOSERVER
1542 /*
1543  * Generate the rpc reply header
1544  * siz arg. is used to decide if adding a cluster is worthwhile
1545  */
1546 int
1547 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp,
1548             int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp)
1549 {
1550         u_int32_t *tl;
1551         struct nfsm_info info;
1552
1553         siz += RPC_REPLYSIZ;
1554         info.mb = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL);
1555         info.mreq = info.mb;
1556         info.mreq->m_pkthdr.len = 0;
1557         /*
1558          * If this is not a cluster, try and leave leading space
1559          * for the lower level headers.
1560          */
1561         if ((max_hdr + siz) < MINCLSIZE)
1562                 info.mreq->m_data += max_hdr;
1563         tl = mtod(info.mreq, u_int32_t *);
1564         info.mreq->m_len = 6 * NFSX_UNSIGNED;
1565         info.bpos = ((caddr_t)tl) + info.mreq->m_len;
1566         *tl++ = txdr_unsigned(nd->nd_retxid);
1567         *tl++ = rpc_reply;
1568         if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1569                 *tl++ = rpc_msgdenied;
1570                 if (err & NFSERR_AUTHERR) {
1571                         *tl++ = rpc_autherr;
1572                         *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1573                         info.mreq->m_len -= NFSX_UNSIGNED;
1574                         info.bpos -= NFSX_UNSIGNED;
1575                 } else {
1576                         *tl++ = rpc_mismatch;
1577                         *tl++ = txdr_unsigned(RPC_VER2);
1578                         *tl = txdr_unsigned(RPC_VER2);
1579                 }
1580         } else {
1581                 *tl++ = rpc_msgaccepted;
1582
1583                 /*
1584                  * For Kerberos authentication, we must send the nickname
1585                  * verifier back, otherwise just RPCAUTH_NULL.
1586                  */
1587                 if (nd->nd_flag & ND_KERBFULL) {
1588                     struct nfsuid *nuidp;
1589                     struct timeval ktvin, ktvout;
1590
1591                     for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1592                         nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1593                         if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1594                             (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1595                              &nuidp->nu_haddr, nd->nd_nam2)))
1596                             break;
1597                     }
1598                     if (nuidp) {
1599                         ktvin.tv_sec =
1600                             txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1601                         ktvin.tv_usec =
1602                             txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1603
1604                         /*
1605                          * Encrypt the timestamp in ecb mode using the
1606                          * session key.
1607                          */
1608 #ifdef NFSKERB
1609                         XXX
1610 #else
1611                         ktvout.tv_sec = 0;
1612                         ktvout.tv_usec = 0;
1613 #endif
1614
1615                         *tl++ = rpc_auth_kerb;
1616                         *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1617                         *tl = ktvout.tv_sec;
1618                         tl = nfsm_build(&info, 3 * NFSX_UNSIGNED);
1619                         *tl++ = ktvout.tv_usec;
1620                         *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1621                     } else {
1622                         *tl++ = 0;
1623                         *tl++ = 0;
1624                     }
1625                 } else {
1626                         *tl++ = 0;
1627                         *tl++ = 0;
1628                 }
1629                 switch (err) {
1630                 case EPROGUNAVAIL:
1631                         *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1632                         break;
1633                 case EPROGMISMATCH:
1634                         *tl = txdr_unsigned(RPC_PROGMISMATCH);
1635                         tl = nfsm_build(&info, 2 * NFSX_UNSIGNED);
1636                         *tl++ = txdr_unsigned(2);
1637                         *tl = txdr_unsigned(3);
1638                         break;
1639                 case EPROCUNAVAIL:
1640                         *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1641                         break;
1642                 case EBADRPC:
1643                         *tl = txdr_unsigned(RPC_GARBAGE);
1644                         break;
1645                 default:
1646                         *tl = 0;
1647                         if (err != NFSERR_RETVOID) {
1648                                 tl = nfsm_build(&info, NFSX_UNSIGNED);
1649                                 if (err)
1650                                     *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1651                                 else
1652                                     *tl = 0;
1653                         }
1654                         break;
1655                 };
1656         }
1657
1658         if (mrq != NULL)
1659             *mrq = info.mreq;
1660         *mbp = info.mb;
1661         *bposp = info.bpos;
1662         if (err != 0 && err != NFSERR_RETVOID)
1663                 nfsstats.srvrpc_errs++;
1664         return (0);
1665 }
1666
1667
1668 #endif /* NFS_NOSERVER */
1669
1670 /*
1671  * Nfs timer routine.
1672  *
1673  * Scan the nfsreq list and retranmit any requests that have timed out
1674  * To avoid retransmission attempts on STREAM sockets (in the future) make
1675  * sure to set the r_retry field to 0 (implies nm_retry == 0).
1676  *
1677  * Requests with attached responses, terminated requests, and
1678  * locked requests are ignored.  Locked requests will be picked up
1679  * in a later timer call.
1680  */
1681 void
1682 nfs_timer(void *arg /* never used */)
1683 {
1684         struct nfsmount *nmp;
1685         struct nfsreq *req;
1686 #ifndef NFS_NOSERVER
1687         struct nfssvc_sock *slp;
1688         u_quad_t cur_usec;
1689 #endif /* NFS_NOSERVER */
1690
1691         crit_enter();
1692         TAILQ_FOREACH(nmp, &nfs_mountq, nm_entry) {
1693                 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
1694                         KKASSERT(nmp == req->r_nmp);
1695                         if (req->r_mrep)
1696                                 continue;
1697                         if (req->r_flags & (R_SOFTTERM | R_LOCKED))
1698                                 continue;
1699                         req->r_flags |= R_LOCKED;
1700                         if (nfs_sigintr(nmp, req, req->r_td)) {
1701                                 nfs_softterm(req, 1);
1702                         } else {
1703                                 nfs_timer_req(req);
1704                         }
1705                         req->r_flags &= ~R_LOCKED;
1706                         if (req->r_flags & R_WANTED) {
1707                                 req->r_flags &= ~R_WANTED;
1708                                 wakeup(req);
1709                         }
1710                 }
1711         }
1712 #ifndef NFS_NOSERVER
1713
1714         /*
1715          * Scan the write gathering queues for writes that need to be
1716          * completed now.
1717          */
1718         cur_usec = nfs_curusec();
1719         TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
1720             if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1721                 nfsrv_wakenfsd(slp, 1);
1722         }
1723 #endif /* NFS_NOSERVER */
1724         crit_exit();
1725         callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL);
1726 }
1727
1728 static
1729 void
1730 nfs_timer_req(struct nfsreq *req)
1731 {
1732         struct thread *td = &thread0; /* XXX for creds, will break if sleep */
1733         struct nfsmount *nmp = req->r_nmp;
1734         struct mbuf *m;
1735         struct socket *so;
1736         int timeo;
1737         int error;
1738
1739         /*
1740          * rtt ticks and timeout calculation.  Return if the timeout
1741          * has not been reached yet, unless the packet is flagged
1742          * for an immediate send.
1743          *
1744          * The mean rtt doesn't help when we get random I/Os, we have
1745          * to multiply by fairly large numbers.
1746          */
1747         if (req->r_rtt >= 0) {
1748                 /*
1749                  * Calculate the timeout to test against.
1750                  */
1751                 req->r_rtt++;
1752                 if (nmp->nm_flag & NFSMNT_DUMBTIMR) {
1753                         timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS;
1754                 } else if (req->r_flags & R_TIMING) {
1755                         timeo = NFS_SRTT(req) + NFS_SDRTT(req);
1756                 } else {
1757                         timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS;
1758                 }
1759                 timeo *= multt[req->r_procnum];
1760                 /* timeo is still scaled by SCALE_BITS */
1761
1762 #define NFSFS   (NFS_RTT_SCALE * NFS_HZ)
1763                 if (req->r_flags & R_TIMING) {
1764                         static long last_time;
1765                         if (nfs_showrtt && last_time != time_second) {
1766                                 kprintf("rpccmd %d NFS SRTT %d SDRTT %d "
1767                                         "timeo %d.%03d\n",
1768                                         proct[req->r_procnum],
1769                                         NFS_SRTT(req), NFS_SDRTT(req),
1770                                         timeo / NFSFS,
1771                                         timeo % NFSFS * 1000 /  NFSFS);
1772                                 last_time = time_second;
1773                         }
1774                 }
1775 #undef NFSFS
1776
1777                 /*
1778                  * deal with nfs_timer jitter.
1779                  */
1780                 timeo = (timeo >> NFS_RTT_SCALE_BITS) + 1;
1781                 if (timeo < 2)
1782                         timeo = 2;
1783
1784                 if (nmp->nm_timeouts > 0)
1785                         timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1786                 if (timeo > NFS_MAXTIMEO)
1787                         timeo = NFS_MAXTIMEO;
1788                 if (req->r_rtt <= timeo) {
1789                         if ((req->r_flags & R_NEEDSXMIT) == 0)
1790                                 return;
1791                 } else if (nmp->nm_timeouts < 8) {
1792                         nmp->nm_timeouts++;
1793                 }
1794         }
1795
1796         /*
1797          * Check for server not responding
1798          */
1799         if ((req->r_flags & R_TPRINTFMSG) == 0 &&
1800              req->r_rexmit > nmp->nm_deadthresh) {
1801                 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1802                         "not responding");
1803                 req->r_flags |= R_TPRINTFMSG;
1804         }
1805         if (req->r_rexmit >= req->r_retry) {    /* too many */
1806                 nfsstats.rpctimeouts++;
1807                 nfs_softterm(req, 1);
1808                 return;
1809         }
1810
1811         /*
1812          * Generally disable retransmission on reliable sockets,
1813          * unless the request is flagged for immediate send.
1814          */
1815         if (nmp->nm_sotype != SOCK_DGRAM) {
1816                 if (++req->r_rexmit > NFS_MAXREXMIT)
1817                         req->r_rexmit = NFS_MAXREXMIT;
1818                 if ((req->r_flags & R_NEEDSXMIT) == 0)
1819                         return;
1820         }
1821
1822         /*
1823          * Stop here if we do not have a socket!
1824          */
1825         if ((so = nmp->nm_so) == NULL)
1826                 return;
1827
1828         /*
1829          * If there is enough space and the window allows.. resend it.
1830          *
1831          * r_rtt is left intact in case we get an answer after the
1832          * retry that was a reply to the original packet.
1833          */
1834         if (ssb_space(&so->so_snd) >= req->r_mreq->m_pkthdr.len &&
1835             (req->r_flags & (R_SENT | R_NEEDSXMIT)) &&
1836            (m = m_copym(req->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){
1837                 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1838                     error = so_pru_send(so, 0, m, NULL, NULL, td);
1839                 else
1840                     error = so_pru_send(so, 0, m, nmp->nm_nam,
1841                         NULL, td);
1842                 if (error) {
1843                         if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1844                                 so->so_error = 0;
1845                         req->r_flags |= R_NEEDSXMIT;
1846                 } else if (req->r_mrep == NULL) {
1847                         /*
1848                          * Iff first send, start timing
1849                          * else turn timing off, backoff timer
1850                          * and divide congestion window by 2.
1851                          *
1852                          * It is possible for the so_pru_send() to
1853                          * block and for us to race a reply so we
1854                          * only do this if the reply field has not
1855                          * been filled in.  R_LOCKED will prevent
1856                          * the request from being ripped out from under
1857                          * us entirely.
1858                          *
1859                          * Record the last resent procnum to aid us
1860                          * in duplicate detection on receive.
1861                          */
1862                         if ((req->r_flags & R_NEEDSXMIT) == 0) {
1863                                 if (nfs_showrexmit)
1864                                         kprintf("X");
1865                                 if (++req->r_rexmit > NFS_MAXREXMIT)
1866                                         req->r_rexmit = NFS_MAXREXMIT;
1867                                 nmp->nm_maxasync_scaled >>= 1;
1868                                 if (nmp->nm_maxasync_scaled < NFS_MINASYNC_SCALED)
1869                                         nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED;
1870                                 nfsstats.rpcretries++;
1871                                 nmp->nm_lastreprocnum = req->r_procnum;
1872                         } else {
1873                                 req->r_flags |= R_SENT;
1874                                 req->r_flags &= ~R_NEEDSXMIT;
1875                         }
1876                 }
1877         }
1878 }
1879
1880 /*
1881  * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1882  * wait for all requests to complete. This is used by forced unmounts
1883  * to terminate any outstanding RPCs.
1884  *
1885  * Locked requests cannot be canceled but will be marked for
1886  * soft-termination.
1887  */
1888 int
1889 nfs_nmcancelreqs(struct nfsmount *nmp)
1890 {
1891         struct nfsreq *req;
1892         int i;
1893
1894         crit_enter();
1895         TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
1896                 if (req->r_mrep != NULL || (req->r_flags & R_SOFTTERM))
1897                         continue;
1898                 nfs_softterm(req, 0);
1899         }
1900         /* XXX  the other two queues as well */
1901         crit_exit();
1902
1903         for (i = 0; i < 30; i++) {
1904                 crit_enter();
1905                 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
1906                         if (nmp == req->r_nmp)
1907                                 break;
1908                 }
1909                 crit_exit();
1910                 if (req == NULL)
1911                         return (0);
1912                 tsleep(&lbolt, 0, "nfscancel", 0);
1913         }
1914         return (EBUSY);
1915 }
1916
1917 /*
1918  * Soft-terminate a request, effectively marking it as failed.
1919  *
1920  * Must be called from within a critical section.
1921  */
1922 static void
1923 nfs_softterm(struct nfsreq *rep, int islocked)
1924 {
1925         rep->r_flags |= R_SOFTTERM;
1926         nfs_hardterm(rep, islocked);
1927 }
1928
1929 /*
1930  * Hard-terminate a request, typically after getting a response.
1931  *
1932  * The state machine can still decide to re-issue it later if necessary.
1933  *
1934  * Must be called from within a critical section.
1935  */
1936 static void
1937 nfs_hardterm(struct nfsreq *rep, int islocked)
1938 {
1939         struct nfsmount *nmp = rep->r_nmp;
1940
1941         /*
1942          * The nm_send count is decremented now to avoid deadlocks
1943          * when the process in soreceive() hasn't yet managed to send
1944          * its own request.
1945          */
1946         if (rep->r_flags & R_SENT) {
1947                 rep->r_flags &= ~R_SENT;
1948         }
1949
1950         /*
1951          * If we locked the request or nobody else has locked the request,
1952          * and the request is async, we can move it to the reader thread's
1953          * queue now and fix up the state.
1954          *
1955          * If we locked the request or nobody else has locked the request,
1956          * we can wake up anyone blocked waiting for a response on the
1957          * request.
1958          */
1959         if (islocked || (rep->r_flags & R_LOCKED) == 0) {
1960                 if ((rep->r_flags & (R_ONREQQ | R_ASYNC)) ==
1961                     (R_ONREQQ | R_ASYNC)) {
1962                         rep->r_flags &= ~R_ONREQQ;
1963                         TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain);
1964                         --nmp->nm_reqqlen;
1965                         TAILQ_INSERT_TAIL(&nmp->nm_reqrxq, rep, r_chain);
1966                         KKASSERT(rep->r_info->state == NFSM_STATE_TRY ||
1967                                  rep->r_info->state == NFSM_STATE_WAITREPLY);
1968                         rep->r_info->state = NFSM_STATE_PROCESSREPLY;
1969                         nfssvc_iod_reader_wakeup(nmp);
1970                         if (TAILQ_FIRST(&nmp->nm_bioq) &&
1971                             nmp->nm_reqqlen == NFS_MAXASYNCBIO * 2 / 3) {
1972                                 nfssvc_iod_writer_wakeup(nmp);
1973                         }
1974                 }
1975                 mtx_abort_ex_link(&nmp->nm_rxlock, &rep->r_link);
1976         }
1977 }
1978
1979 /*
1980  * Test for a termination condition pending on the process.
1981  * This is used for NFSMNT_INT mounts.
1982  */
1983 int
1984 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
1985 {
1986         sigset_t tmpset;
1987         struct proc *p;
1988         struct lwp *lp;
1989
1990         if (rep && (rep->r_flags & R_SOFTTERM))
1991                 return (EINTR);
1992         /* Terminate all requests while attempting a forced unmount. */
1993         if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1994                 return (EINTR);
1995         if (!(nmp->nm_flag & NFSMNT_INT))
1996                 return (0);
1997         /* td might be NULL YYY */
1998         if (td == NULL || (p = td->td_proc) == NULL)
1999                 return (0);
2000
2001         lp = td->td_lwp;
2002         tmpset = lwp_sigpend(lp);
2003         SIGSETNAND(tmpset, lp->lwp_sigmask);
2004         SIGSETNAND(tmpset, p->p_sigignore);
2005         if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset))
2006                 return (EINTR);
2007
2008         return (0);
2009 }
2010
2011 /*
2012  * Lock a socket against others.
2013  * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
2014  * and also to avoid race conditions between the processes with nfs requests
2015  * in progress when a reconnect is necessary.
2016  */
2017 int
2018 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep)
2019 {
2020         mtx_t mtx = &nmp->nm_txlock;
2021         struct thread *td;
2022         int slptimeo;
2023         int slpflag;
2024         int error;
2025
2026         slpflag = 0;
2027         slptimeo = 0;
2028         td = rep ? rep->r_td : NULL;
2029         if (nmp->nm_flag & NFSMNT_INT)
2030                 slpflag = PCATCH;
2031
2032         while ((error = mtx_lock_ex_try(mtx)) != 0) {
2033                 if (nfs_sigintr(nmp, rep, td)) {
2034                         error = EINTR;
2035                         break;
2036                 }
2037                 error = mtx_lock_ex(mtx, "nfsndlck", slpflag, slptimeo);
2038                 if (error == 0)
2039                         break;
2040                 if (slpflag == PCATCH) {
2041                         slpflag = 0;
2042                         slptimeo = 2 * hz;
2043                 }
2044         }
2045         /* Always fail if our request has been cancelled. */
2046         if (rep && (rep->r_flags & R_SOFTTERM)) {
2047                 if (error == 0)
2048                         mtx_unlock(mtx);
2049                 error = EINTR;
2050         }
2051         return (error);
2052 }
2053
2054 /*
2055  * Unlock the stream socket for others.
2056  */
2057 void
2058 nfs_sndunlock(struct nfsmount *nmp)
2059 {
2060         mtx_unlock(&nmp->nm_txlock);
2061 }
2062
2063 /*
2064  * Lock the receiver side of the socket.
2065  *
2066  * rep may be NULL.
2067  */
2068 static int
2069 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep)
2070 {
2071         mtx_t mtx = &nmp->nm_rxlock;
2072         int slpflag;
2073         int slptimeo;
2074         int error;
2075
2076         /*
2077          * Unconditionally check for completion in case another nfsiod
2078          * get the packet while the caller was blocked, before the caller
2079          * called us.  Packet reception is handled by mainline code which
2080          * is protected by the BGL at the moment.
2081          *
2082          * We do not strictly need the second check just before the
2083          * tsleep(), but it's good defensive programming.
2084          */
2085         if (rep && rep->r_mrep != NULL)
2086                 return (EALREADY);
2087
2088         if (nmp->nm_flag & NFSMNT_INT)
2089                 slpflag = PCATCH;
2090         else
2091                 slpflag = 0;
2092         slptimeo = 0;
2093
2094         while ((error = mtx_lock_ex_try(mtx)) != 0) {
2095                 if (nfs_sigintr(nmp, rep, (rep ? rep->r_td : NULL))) {
2096                         error = EINTR;
2097                         break;
2098                 }
2099                 if (rep && rep->r_mrep != NULL) {
2100                         error = EALREADY;
2101                         break;
2102                 }
2103
2104                 /*
2105                  * NOTE: can return ENOLCK, but in that case rep->r_mrep
2106                  *       will already be set.
2107                  */
2108                 if (rep) {
2109                         error = mtx_lock_ex_link(mtx, &rep->r_link,
2110                                                  "nfsrcvlk",
2111                                                  slpflag, slptimeo);
2112                 } else {
2113                         error = mtx_lock_ex(mtx, "nfsrcvlk", slpflag, slptimeo);
2114                 }
2115                 if (error == 0)
2116                         break;
2117
2118                 /*
2119                  * If our reply was recieved while we were sleeping,
2120                  * then just return without taking the lock to avoid a
2121                  * situation where a single iod could 'capture' the
2122                  * recieve lock.
2123                  */
2124                 if (rep && rep->r_mrep != NULL) {
2125                         error = EALREADY;
2126                         break;
2127                 }
2128                 if (slpflag == PCATCH) {
2129                         slpflag = 0;
2130                         slptimeo = 2 * hz;
2131                 }
2132         }
2133         if (error == 0) {
2134                 if (rep && rep->r_mrep != NULL) {
2135                         error = EALREADY;
2136                         mtx_unlock(mtx);
2137                 }
2138         }
2139         return (error);
2140 }
2141
2142 /*
2143  * Unlock the stream socket for others.
2144  */
2145 static void
2146 nfs_rcvunlock(struct nfsmount *nmp)
2147 {
2148         mtx_unlock(&nmp->nm_rxlock);
2149 }
2150
2151 /*
2152  *      nfs_realign:
2153  *
2154  *      Check for badly aligned mbuf data and realign by copying the unaligned
2155  *      portion of the data into a new mbuf chain and freeing the portions
2156  *      of the old chain that were replaced.
2157  *
2158  *      We cannot simply realign the data within the existing mbuf chain
2159  *      because the underlying buffers may contain other rpc commands and
2160  *      we cannot afford to overwrite them.
2161  *
2162  *      We would prefer to avoid this situation entirely.  The situation does
2163  *      not occur with NFS/UDP and is supposed to only occassionally occur
2164  *      with TCP.  Use vfs.nfs.realign_count and realign_test to check this.
2165  */
2166 static void
2167 nfs_realign(struct mbuf **pm, int hsiz)
2168 {
2169         struct mbuf *m;
2170         struct mbuf *n = NULL;
2171         int off = 0;
2172
2173         ++nfs_realign_test;
2174
2175         while ((m = *pm) != NULL) {
2176                 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
2177                         n = m_getl(m->m_len, MB_WAIT, MT_DATA, 0, NULL);
2178                         n->m_len = 0;
2179                         break;
2180                 }
2181                 pm = &m->m_next;
2182         }
2183
2184         /*
2185          * If n is non-NULL, loop on m copying data, then replace the
2186          * portion of the chain that had to be realigned.
2187          */
2188         if (n != NULL) {
2189                 ++nfs_realign_count;
2190                 while (m) {
2191                         m_copyback(n, off, m->m_len, mtod(m, caddr_t));
2192                         off += m->m_len;
2193                         m = m->m_next;
2194                 }
2195                 m_freem(*pm);
2196                 *pm = n;
2197         }
2198 }
2199
2200 #ifndef NFS_NOSERVER
2201
2202 /*
2203  * Parse an RPC request
2204  * - verify it
2205  * - fill in the cred struct.
2206  */
2207 int
2208 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header)
2209 {
2210         int len, i;
2211         u_int32_t *tl;
2212         struct uio uio;
2213         struct iovec iov;
2214         caddr_t cp;
2215         u_int32_t nfsvers, auth_type;
2216         uid_t nickuid;
2217         int error = 0, ticklen;
2218         struct nfsuid *nuidp;
2219         struct timeval tvin, tvout;
2220         struct nfsm_info info;
2221 #if 0                           /* until encrypted keys are implemented */
2222         NFSKERBKEYSCHED_T keys; /* stores key schedule */
2223 #endif
2224
2225         info.mrep = nd->nd_mrep;
2226         info.md = nd->nd_md;
2227         info.dpos = nd->nd_dpos;
2228
2229         if (has_header) {
2230                 NULLOUT(tl = nfsm_dissect(&info, 10 * NFSX_UNSIGNED));
2231                 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
2232                 if (*tl++ != rpc_call) {
2233                         m_freem(info.mrep);
2234                         return (EBADRPC);
2235                 }
2236         } else {
2237                 NULLOUT(tl = nfsm_dissect(&info, 8 * NFSX_UNSIGNED));
2238         }
2239         nd->nd_repstat = 0;
2240         nd->nd_flag = 0;
2241         if (*tl++ != rpc_vers) {
2242                 nd->nd_repstat = ERPCMISMATCH;
2243                 nd->nd_procnum = NFSPROC_NOOP;
2244                 return (0);
2245         }
2246         if (*tl != nfs_prog) {
2247                 nd->nd_repstat = EPROGUNAVAIL;
2248                 nd->nd_procnum = NFSPROC_NOOP;
2249                 return (0);
2250         }
2251         tl++;
2252         nfsvers = fxdr_unsigned(u_int32_t, *tl++);
2253         if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) {
2254                 nd->nd_repstat = EPROGMISMATCH;
2255                 nd->nd_procnum = NFSPROC_NOOP;
2256                 return (0);
2257         }
2258         if (nfsvers == NFS_VER3)
2259                 nd->nd_flag = ND_NFSV3;
2260         nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
2261         if (nd->nd_procnum == NFSPROC_NULL)
2262                 return (0);
2263         if (nd->nd_procnum >= NFS_NPROCS ||
2264                 (nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
2265                 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
2266                 nd->nd_repstat = EPROCUNAVAIL;
2267                 nd->nd_procnum = NFSPROC_NOOP;
2268                 return (0);
2269         }
2270         if ((nd->nd_flag & ND_NFSV3) == 0)
2271                 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
2272         auth_type = *tl++;
2273         len = fxdr_unsigned(int, *tl++);
2274         if (len < 0 || len > RPCAUTH_MAXSIZ) {
2275                 m_freem(info.mrep);
2276                 return (EBADRPC);
2277         }
2278
2279         nd->nd_flag &= ~ND_KERBAUTH;
2280         /*
2281          * Handle auth_unix or auth_kerb.
2282          */
2283         if (auth_type == rpc_auth_unix) {
2284                 len = fxdr_unsigned(int, *++tl);
2285                 if (len < 0 || len > NFS_MAXNAMLEN) {
2286                         m_freem(info.mrep);
2287                         return (EBADRPC);
2288                 }
2289                 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
2290                 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
2291                 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
2292                 nd->nd_cr.cr_ref = 1;
2293                 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
2294                 nd->nd_cr.cr_ruid = nd->nd_cr.cr_svuid = nd->nd_cr.cr_uid;
2295                 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
2296                 nd->nd_cr.cr_rgid = nd->nd_cr.cr_svgid = nd->nd_cr.cr_gid;
2297                 len = fxdr_unsigned(int, *tl);
2298                 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
2299                         m_freem(info.mrep);
2300                         return (EBADRPC);
2301                 }
2302                 NULLOUT(tl = nfsm_dissect(&info, (len + 2) * NFSX_UNSIGNED));
2303                 for (i = 1; i <= len; i++)
2304                     if (i < NGROUPS)
2305                         nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
2306                     else
2307                         tl++;
2308                 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
2309                 if (nd->nd_cr.cr_ngroups > 1)
2310                     nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
2311                 len = fxdr_unsigned(int, *++tl);
2312                 if (len < 0 || len > RPCAUTH_MAXSIZ) {
2313                         m_freem(info.mrep);
2314                         return (EBADRPC);
2315                 }
2316                 if (len > 0) {
2317                         ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
2318                 }
2319         } else if (auth_type == rpc_auth_kerb) {
2320                 switch (fxdr_unsigned(int, *tl++)) {
2321                 case RPCAKN_FULLNAME:
2322                         ticklen = fxdr_unsigned(int, *tl);
2323                         *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
2324                         uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
2325                         nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
2326                         if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
2327                                 m_freem(info.mrep);
2328                                 return (EBADRPC);
2329                         }
2330                         uio.uio_offset = 0;
2331                         uio.uio_iov = &iov;
2332                         uio.uio_iovcnt = 1;
2333                         uio.uio_segflg = UIO_SYSSPACE;
2334                         iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
2335                         iov.iov_len = RPCAUTH_MAXSIZ - 4;
2336                         ERROROUT(nfsm_mtouio(&info, &uio, uio.uio_resid));
2337                         NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
2338                         if (*tl++ != rpc_auth_kerb ||
2339                                 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
2340                                 kprintf("Bad kerb verifier\n");
2341                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2342                                 nd->nd_procnum = NFSPROC_NOOP;
2343                                 return (0);
2344                         }
2345                         NULLOUT(cp = nfsm_dissect(&info, 4 * NFSX_UNSIGNED));
2346                         tl = (u_int32_t *)cp;
2347                         if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
2348                                 kprintf("Not fullname kerb verifier\n");
2349                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2350                                 nd->nd_procnum = NFSPROC_NOOP;
2351                                 return (0);
2352                         }
2353                         cp += NFSX_UNSIGNED;
2354                         bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
2355                         nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
2356                         nd->nd_flag |= ND_KERBFULL;
2357                         nfsd->nfsd_flag |= NFSD_NEEDAUTH;
2358                         break;
2359                 case RPCAKN_NICKNAME:
2360                         if (len != 2 * NFSX_UNSIGNED) {
2361                                 kprintf("Kerb nickname short\n");
2362                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
2363                                 nd->nd_procnum = NFSPROC_NOOP;
2364                                 return (0);
2365                         }
2366                         nickuid = fxdr_unsigned(uid_t, *tl);
2367                         NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
2368                         if (*tl++ != rpc_auth_kerb ||
2369                                 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
2370                                 kprintf("Kerb nick verifier bad\n");
2371                                 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2372                                 nd->nd_procnum = NFSPROC_NOOP;
2373                                 return (0);
2374                         }
2375                         NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
2376                         tvin.tv_sec = *tl++;
2377                         tvin.tv_usec = *tl;
2378
2379                         for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
2380                             nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
2381                                 if (nuidp->nu_cr.cr_uid == nickuid &&
2382                                     (!nd->nd_nam2 ||
2383                                      netaddr_match(NU_NETFAM(nuidp),
2384                                       &nuidp->nu_haddr, nd->nd_nam2)))
2385                                         break;
2386                         }
2387                         if (!nuidp) {
2388                                 nd->nd_repstat =
2389                                         (NFSERR_AUTHERR|AUTH_REJECTCRED);
2390                                 nd->nd_procnum = NFSPROC_NOOP;
2391                                 return (0);
2392                         }
2393
2394                         /*
2395                          * Now, decrypt the timestamp using the session key
2396                          * and validate it.
2397                          */
2398 #ifdef NFSKERB
2399                         XXX
2400 #else
2401                         tvout.tv_sec = 0;
2402                         tvout.tv_usec = 0;
2403 #endif
2404
2405                         tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
2406                         tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
2407                         if (nuidp->nu_expire < time_second ||
2408                             nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
2409                             (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
2410                              nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
2411                                 nuidp->nu_expire = 0;
2412                                 nd->nd_repstat =
2413                                     (NFSERR_AUTHERR|AUTH_REJECTVERF);
2414                                 nd->nd_procnum = NFSPROC_NOOP;
2415                                 return (0);
2416                         }
2417                         nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
2418                         nd->nd_flag |= ND_KERBNICK;
2419                 };
2420         } else {
2421                 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
2422                 nd->nd_procnum = NFSPROC_NOOP;
2423                 return (0);
2424         }
2425
2426         nd->nd_md = info.md;
2427         nd->nd_dpos = info.dpos;
2428         return (0);
2429 nfsmout:
2430         return (error);
2431 }
2432
2433 #endif
2434
2435 /*
2436  * Send a message to the originating process's terminal.  The thread and/or
2437  * process may be NULL.  YYY the thread should not be NULL but there may
2438  * still be some uio_td's that are still being passed as NULL through to
2439  * nfsm_request().
2440  */
2441 static int
2442 nfs_msg(struct thread *td, char *server, char *msg)
2443 {
2444         tpr_t tpr;
2445
2446         if (td && td->td_proc)
2447                 tpr = tprintf_open(td->td_proc);
2448         else
2449                 tpr = NULL;
2450         tprintf(tpr, "nfs server %s: %s\n", server, msg);
2451         tprintf_close(tpr);
2452         return (0);
2453 }
2454
2455 #ifndef NFS_NOSERVER
2456 /*
2457  * Socket upcall routine for the nfsd sockets.
2458  * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2459  * Essentially do as much as possible non-blocking, else punt and it will
2460  * be called with MB_WAIT from an nfsd.
2461  */
2462 void
2463 nfsrv_rcv(struct socket *so, void *arg, int waitflag)
2464 {
2465         struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2466         struct mbuf *m;
2467         struct sockaddr *nam;
2468         struct sockbuf sio;
2469         int flags, error;
2470         int nparallel_wakeup = 0;
2471
2472         if ((slp->ns_flag & SLP_VALID) == 0)
2473                 return;
2474
2475         /*
2476          * Do not allow an infinite number of completed RPC records to build 
2477          * up before we stop reading data from the socket.  Otherwise we could
2478          * end up holding onto an unreasonable number of mbufs for requests
2479          * waiting for service.
2480          *
2481          * This should give pretty good feedback to the TCP
2482          * layer and prevents a memory crunch for other protocols.
2483          *
2484          * Note that the same service socket can be dispatched to several
2485          * nfs servers simultaniously.
2486          *
2487          * the tcp protocol callback calls us with MB_DONTWAIT.  
2488          * nfsd calls us with MB_WAIT (typically).
2489          */
2490         if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) {
2491                 slp->ns_flag |= SLP_NEEDQ;
2492                 goto dorecs;
2493         }
2494
2495         /*
2496          * Handle protocol specifics to parse an RPC request.  We always
2497          * pull from the socket using non-blocking I/O.
2498          */
2499         if (so->so_type == SOCK_STREAM) {
2500                 /*
2501                  * The data has to be read in an orderly fashion from a TCP
2502                  * stream, unlike a UDP socket.  It is possible for soreceive
2503                  * and/or nfsrv_getstream() to block, so make sure only one
2504                  * entity is messing around with the TCP stream at any given
2505                  * moment.  The receive sockbuf's lock in soreceive is not
2506                  * sufficient.
2507                  *
2508                  * Note that this procedure can be called from any number of
2509                  * NFS severs *OR* can be upcalled directly from a TCP
2510                  * protocol thread.
2511                  */
2512                 if (slp->ns_flag & SLP_GETSTREAM) {
2513                         slp->ns_flag |= SLP_NEEDQ;
2514                         goto dorecs;
2515                 }
2516                 slp->ns_flag |= SLP_GETSTREAM;
2517
2518                 /*
2519                  * Do soreceive().  Pull out as much data as possible without
2520                  * blocking.
2521                  */
2522                 sbinit(&sio, 1000000000);
2523                 flags = MSG_DONTWAIT;
2524                 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags);
2525                 if (error || sio.sb_mb == NULL) {
2526                         if (error == EWOULDBLOCK)
2527                                 slp->ns_flag |= SLP_NEEDQ;
2528                         else
2529                                 slp->ns_flag |= SLP_DISCONN;
2530                         slp->ns_flag &= ~SLP_GETSTREAM;
2531                         goto dorecs;
2532                 }
2533                 m = sio.sb_mb;
2534                 if (slp->ns_rawend) {
2535                         slp->ns_rawend->m_next = m;
2536                         slp->ns_cc += sio.sb_cc;
2537                 } else {
2538                         slp->ns_raw = m;
2539                         slp->ns_cc = sio.sb_cc;
2540                 }
2541                 while (m->m_next)
2542                         m = m->m_next;
2543                 slp->ns_rawend = m;
2544
2545                 /*
2546                  * Now try and parse as many record(s) as we can out of the
2547                  * raw stream data.
2548                  */
2549                 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup);
2550                 if (error) {
2551                         if (error == EPERM)
2552                                 slp->ns_flag |= SLP_DISCONN;
2553                         else
2554                                 slp->ns_flag |= SLP_NEEDQ;
2555                 }
2556                 slp->ns_flag &= ~SLP_GETSTREAM;
2557         } else {
2558                 /*
2559                  * For UDP soreceive typically pulls just one packet, loop
2560                  * to get the whole batch.
2561                  */
2562                 do {
2563                         sbinit(&sio, 1000000000);
2564                         flags = MSG_DONTWAIT;
2565                         error = so_pru_soreceive(so, &nam, NULL, &sio,
2566                                                  NULL, &flags);
2567                         if (sio.sb_mb) {
2568                                 struct nfsrv_rec *rec;
2569                                 int mf = (waitflag & MB_DONTWAIT) ?
2570                                             M_NOWAIT : M_WAITOK;
2571                                 rec = kmalloc(sizeof(struct nfsrv_rec),
2572                                              M_NFSRVDESC, mf);
2573                                 if (!rec) {
2574                                         if (nam)
2575                                                 FREE(nam, M_SONAME);
2576                                         m_freem(sio.sb_mb);
2577                                         continue;
2578                                 }
2579                                 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED);
2580                                 rec->nr_address = nam;
2581                                 rec->nr_packet = sio.sb_mb;
2582                                 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2583                                 ++slp->ns_numrec;
2584                                 ++nparallel_wakeup;
2585                         }
2586                         if (error) {
2587                                 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2588                                         && error != EWOULDBLOCK) {
2589                                         slp->ns_flag |= SLP_DISCONN;
2590                                         goto dorecs;
2591                                 }
2592                         }
2593                 } while (sio.sb_mb);
2594         }
2595
2596         /*
2597          * If we were upcalled from the tcp protocol layer and we have
2598          * fully parsed records ready to go, or there is new data pending,
2599          * or something went wrong, try to wake up an nfsd thread to deal
2600          * with it.
2601          */
2602 dorecs:
2603         if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0
2604              || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) {
2605                 nfsrv_wakenfsd(slp, nparallel_wakeup);
2606         }
2607 }
2608
2609 /*
2610  * Try and extract an RPC request from the mbuf data list received on a
2611  * stream socket. The "waitflag" argument indicates whether or not it
2612  * can sleep.
2613  */
2614 static int
2615 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp)
2616 {
2617         struct mbuf *m, **mpp;
2618         char *cp1, *cp2;
2619         int len;
2620         struct mbuf *om, *m2, *recm;
2621         u_int32_t recmark;
2622
2623         for (;;) {
2624             if (slp->ns_reclen == 0) {
2625                 if (slp->ns_cc < NFSX_UNSIGNED)
2626                         return (0);
2627                 m = slp->ns_raw;
2628                 if (m->m_len >= NFSX_UNSIGNED) {
2629                         bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2630                         m->m_data += NFSX_UNSIGNED;
2631                         m->m_len -= NFSX_UNSIGNED;
2632                 } else {
2633                         cp1 = (caddr_t)&recmark;
2634                         cp2 = mtod(m, caddr_t);
2635                         while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2636                                 while (m->m_len == 0) {
2637                                         m = m->m_next;
2638                                         cp2 = mtod(m, caddr_t);
2639                                 }
2640                                 *cp1++ = *cp2++;
2641                                 m->m_data++;
2642                                 m->m_len--;
2643                         }
2644                 }
2645                 slp->ns_cc -= NFSX_UNSIGNED;
2646                 recmark = ntohl(recmark);
2647                 slp->ns_reclen = recmark & ~0x80000000;
2648                 if (recmark & 0x80000000)
2649                         slp->ns_flag |= SLP_LASTFRAG;
2650                 else
2651                         slp->ns_flag &= ~SLP_LASTFRAG;
2652                 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) {
2653                         log(LOG_ERR, "%s (%d) from nfs client\n",
2654                             "impossible packet length",
2655                             slp->ns_reclen);
2656                         return (EPERM);
2657                 }
2658             }
2659
2660             /*
2661              * Now get the record part.
2662              *
2663              * Note that slp->ns_reclen may be 0.  Linux sometimes
2664              * generates 0-length RPCs
2665              */
2666             recm = NULL;
2667             if (slp->ns_cc == slp->ns_reclen) {
2668                 recm = slp->ns_raw;
2669                 slp->ns_raw = slp->ns_rawend = NULL;
2670                 slp->ns_cc = slp->ns_reclen = 0;
2671             } else if (slp->ns_cc > slp->ns_reclen) {
2672                 len = 0;
2673                 m = slp->ns_raw;
2674                 om = NULL;
2675
2676                 while (len < slp->ns_reclen) {
2677                         if ((len + m->m_len) > slp->ns_reclen) {
2678                                 m2 = m_copym(m, 0, slp->ns_reclen - len,
2679                                         waitflag);
2680                                 if (m2) {
2681                                         if (om) {
2682                                                 om->m_next = m2;
2683                                                 recm = slp->ns_raw;
2684                                         } else
2685                                                 recm = m2;
2686                                         m->m_data += slp->ns_reclen - len;
2687                                         m->m_len -= slp->ns_reclen - len;
2688                                         len = slp->ns_reclen;
2689                                 } else {
2690                                         return (EWOULDBLOCK);
2691                                 }
2692                         } else if ((len + m->m_len) == slp->ns_reclen) {
2693                                 om = m;
2694                                 len += m->m_len;
2695                                 m = m->m_next;
2696                                 recm = slp->ns_raw;
2697                                 om->m_next = NULL;
2698                         } else {
2699                                 om = m;
2700                                 len += m->m_len;
2701                                 m = m->m_next;
2702                         }
2703                 }
2704                 slp->ns_raw = m;
2705                 slp->ns_cc -= len;
2706                 slp->ns_reclen = 0;
2707             } else {
2708                 return (0);
2709             }
2710
2711             /*
2712              * Accumulate the fragments into a record.
2713              */
2714             mpp = &slp->ns_frag;
2715             while (*mpp)
2716                 mpp = &((*mpp)->m_next);
2717             *mpp = recm;
2718             if (slp->ns_flag & SLP_LASTFRAG) {
2719                 struct nfsrv_rec *rec;
2720                 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK;
2721                 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf);
2722                 if (!rec) {
2723                     m_freem(slp->ns_frag);
2724                 } else {
2725                     nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2726                     rec->nr_address = NULL;
2727                     rec->nr_packet = slp->ns_frag;
2728                     STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2729                     ++slp->ns_numrec;
2730                     ++*countp;
2731                 }
2732                 slp->ns_frag = NULL;
2733             }
2734         }
2735 }
2736
2737 /*
2738  * Parse an RPC header.
2739  */
2740 int
2741 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd,
2742             struct nfsrv_descript **ndp)
2743 {
2744         struct nfsrv_rec *rec;
2745         struct mbuf *m;
2746         struct sockaddr *nam;
2747         struct nfsrv_descript *nd;
2748         int error;
2749
2750         *ndp = NULL;
2751         if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2752                 return (ENOBUFS);
2753         rec = STAILQ_FIRST(&slp->ns_rec);
2754         STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2755         KKASSERT(slp->ns_numrec > 0);
2756         --slp->ns_numrec;
2757         nam = rec->nr_address;
2758         m = rec->nr_packet;
2759         kfree(rec, M_NFSRVDESC);
2760         MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2761                 M_NFSRVDESC, M_WAITOK);
2762         nd->nd_md = nd->nd_mrep = m;
2763         nd->nd_nam2 = nam;
2764         nd->nd_dpos = mtod(m, caddr_t);
2765         error = nfs_getreq(nd, nfsd, TRUE);
2766         if (error) {
2767                 if (nam) {
2768                         FREE(nam, M_SONAME);
2769                 }
2770                 kfree((caddr_t)nd, M_NFSRVDESC);
2771                 return (error);
2772         }
2773         *ndp = nd;
2774         nfsd->nfsd_nd = nd;
2775         return (0);
2776 }
2777
2778 /*
2779  * Try to assign service sockets to nfsd threads based on the number
2780  * of new rpc requests that have been queued on the service socket.
2781  *
2782  * If no nfsd's are available or additonal requests are pending, set the
2783  * NFSD_CHECKSLP flag so that one of the running nfsds will go look for
2784  * the work in the nfssvc_sock list when it is finished processing its
2785  * current work.  This flag is only cleared when an nfsd can not find
2786  * any new work to perform.
2787  */
2788 void
2789 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel)
2790 {
2791         struct nfsd *nd;
2792
2793         if ((slp->ns_flag & SLP_VALID) == 0)
2794                 return;
2795         if (nparallel <= 1)
2796                 nparallel = 1;
2797         TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) {
2798                 if (nd->nfsd_flag & NFSD_WAITING) {
2799                         nd->nfsd_flag &= ~NFSD_WAITING;
2800                         if (nd->nfsd_slp)
2801                                 panic("nfsd wakeup");
2802                         slp->ns_sref++;
2803                         nd->nfsd_slp = slp;
2804                         wakeup((caddr_t)nd);
2805                         if (--nparallel == 0)
2806                                 break;
2807                 }
2808         }
2809         if (nparallel) {
2810                 slp->ns_flag |= SLP_DOREC;
2811                 nfsd_head_flag |= NFSD_CHECKSLP;
2812         }
2813 }
2814 #endif /* NFS_NOSERVER */