FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_socket.c
1 /*
2 * Copyright (c) 1989, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)nfs_socket.c 8.3 (Berkeley) 1/12/94
37 * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.18.2.3 1999/09/05 08:19:42 peter Exp $
38 */
39
40 /*
41 * Socket operations for use by nfs
42 */
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/proc.h>
47 #include <sys/mount.h>
48 #include <sys/kernel.h>
49 #include <sys/mbuf.h>
50 #include <sys/vnode.h>
51 #include <sys/domain.h>
52 #include <sys/protosw.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/syslog.h>
56 #include <sys/tprintf.h>
57
58 #include <netinet/in.h>
59 #include <netinet/tcp.h>
60
61 #include <nfs/rpcv2.h>
62 #include <nfs/nfsproto.h>
63 #include <nfs/nfs.h>
64 #include <nfs/xdr_subs.h>
65 #include <nfs/nfsm_subs.h>
66 #include <nfs/nfsmount.h>
67 #include <nfs/nfsnode.h>
68 #include <nfs/nfsrtt.h>
69 #include <nfs/nqnfs.h>
70
71 #define TRUE 1
72 #define FALSE 0
73
74 /*
75 * Estimate rto for an nfs rpc sent via. an unreliable datagram.
76 * Use the mean and mean deviation of rtt for the appropriate type of rpc
77 * for the frequent rpcs and a default for the others.
78 * The justification for doing "other" this way is that these rpcs
79 * happen so infrequently that timer est. would probably be stale.
80 * Also, since many of these rpcs are
81 * non-idempotent, a conservative timeout is desired.
82 * getattr, lookup - A+2D
83 * read, write - A+4D
84 * other - nm_timeo
85 */
86 #define NFS_RTO(n, t) \
87 ((t) == 0 ? (n)->nm_timeo : \
88 ((t) < 3 ? \
89 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
90 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
91 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
92 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
93 /*
94 * External data, mostly RPC constants in XDR form
95 */
96 extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix,
97 rpc_msgaccepted, rpc_call, rpc_autherr,
98 rpc_auth_kerb;
99 extern u_long nfs_prog, nqnfs_prog;
100 extern time_t nqnfsstarttime;
101 extern struct nfsstats nfsstats;
102 extern int nfsv3_procid[NFS_NPROCS];
103 extern int nfs_ticks;
104
105 /*
106 * Defines which timer to use for the procnum.
107 * 0 - default
108 * 1 - getattr
109 * 2 - lookup
110 * 3 - read
111 * 4 - write
112 */
113 static int proct[NFS_NPROCS] = {
114 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
115 0, 0, 0,
116 };
117
118 /*
119 * There is a congestion window for outstanding rpcs maintained per mount
120 * point. The cwnd size is adjusted in roughly the way that:
121 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
122 * SIGCOMM '88". ACM, August 1988.
123 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
124 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
125 * of rpcs is in progress.
126 * (The sent count and cwnd are scaled for integer arith.)
127 * Variants of "slow start" were tried and were found to be too much of a
128 * performance hit (ave. rtt 3 times larger),
129 * I suspect due to the large rtt that nfs rpcs have.
130 */
131 #define NFS_CWNDSCALE 256
132 #define NFS_MAXCWND (NFS_CWNDSCALE * 32)
133 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
134 int nfsrtton = 0;
135 struct nfsrtt nfsrtt;
136
137 static int nfs_msg __P((struct proc *,char *,char *));
138 static int nfs_rcvlock __P((struct nfsreq *));
139 static void nfs_rcvunlock __P((int *flagp));
140 static void nfs_realign __P((struct mbuf *m, int hsiz));
141 static int nfs_receive __P((struct nfsreq *rep, struct mbuf **aname,
142 struct mbuf **mp));
143 static int nfs_reconnect __P((struct nfsreq *rep));
144 #ifndef NFS_NOSERVER
145 static int nfsrv_getstream __P((struct nfssvc_sock *,int));
146
147 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *nd,
148 struct nfssvc_sock *slp,
149 struct proc *procp,
150 struct mbuf **mreqp)) = {
151 nfsrv_null,
152 nfsrv_getattr,
153 nfsrv_setattr,
154 nfsrv_lookup,
155 nfsrv3_access,
156 nfsrv_readlink,
157 nfsrv_read,
158 nfsrv_write,
159 nfsrv_create,
160 nfsrv_mkdir,
161 nfsrv_symlink,
162 nfsrv_mknod,
163 nfsrv_remove,
164 nfsrv_rmdir,
165 nfsrv_rename,
166 nfsrv_link,
167 nfsrv_readdir,
168 nfsrv_readdirplus,
169 nfsrv_statfs,
170 nfsrv_fsinfo,
171 nfsrv_pathconf,
172 nfsrv_commit,
173 nqnfsrv_getlease,
174 nqnfsrv_vacated,
175 nfsrv_noop,
176 nfsrv_noop
177 };
178 #endif /* NFS_NOSERVER */
179
180 /*
181 * Initialize sockets and congestion for a new NFS connection.
182 * We do not free the sockaddr if error.
183 */
184 int
185 nfs_connect(nmp, rep)
186 register struct nfsmount *nmp;
187 struct nfsreq *rep;
188 {
189 register struct socket *so;
190 int s, error, rcvreserve, sndreserve;
191 struct sockaddr *saddr;
192 struct sockaddr_in *sin;
193 struct mbuf *m;
194 u_short tport;
195 struct proc *p = &proc0; /* only used for socreate */
196
197 nmp->nm_so = (struct socket *)0;
198 saddr = mtod(nmp->nm_nam, struct sockaddr *);
199 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
200 nmp->nm_soproto, p);
201 if (error)
202 goto bad;
203 so = nmp->nm_so;
204 so->so_state &= ~SS_PRIV; /* don't need it */
205 nmp->nm_soflags = so->so_proto->pr_flags;
206
207 /*
208 * Some servers require that the client port be a reserved port number.
209 */
210 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
211 MGET(m, M_WAIT, MT_SONAME);
212 sin = mtod(m, struct sockaddr_in *);
213 sin->sin_len = m->m_len = sizeof (struct sockaddr_in);
214 sin->sin_family = AF_INET;
215 sin->sin_addr.s_addr = INADDR_ANY;
216 tport = IPPORT_RESERVED - 1;
217 sin->sin_port = htons(tport);
218 while ((error = sobind(so, m)) == EADDRINUSE &&
219 --tport > IPPORT_RESERVED / 2)
220 sin->sin_port = htons(tport);
221 m_freem(m);
222 if (error)
223 goto bad;
224 }
225
226 /*
227 * Protocols that do not require connections may be optionally left
228 * unconnected for servers that reply from a port other than NFS_PORT.
229 */
230 if (nmp->nm_flag & NFSMNT_NOCONN) {
231 if (nmp->nm_soflags & PR_CONNREQUIRED) {
232 error = ENOTCONN;
233 goto bad;
234 }
235 } else {
236 error = soconnect(so, nmp->nm_nam);
237 if (error)
238 goto bad;
239
240 /*
241 * Wait for the connection to complete. Cribbed from the
242 * connect system call but with the wait timing out so
243 * that interruptible mounts don't hang here for a long time.
244 */
245 s = splnet();
246 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
247 (void) tsleep((caddr_t)&so->so_timeo, PSOCK,
248 "nfscon", 2 * hz);
249 if ((so->so_state & SS_ISCONNECTING) &&
250 so->so_error == 0 && rep &&
251 (error = nfs_sigintr(nmp, rep, rep->r_procp))) {
252 so->so_state &= ~SS_ISCONNECTING;
253 splx(s);
254 goto bad;
255 }
256 }
257 if (so->so_error) {
258 error = so->so_error;
259 so->so_error = 0;
260 splx(s);
261 goto bad;
262 }
263 splx(s);
264 }
265 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) {
266 so->so_rcv.sb_timeo = (5 * hz);
267 so->so_snd.sb_timeo = (5 * hz);
268 } else {
269 so->so_rcv.sb_timeo = 0;
270 so->so_snd.sb_timeo = 0;
271 }
272 if (nmp->nm_sotype == SOCK_DGRAM) {
273 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2;
274 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR) * 2;
275 } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
276 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2;
277 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR) * 2;
278 } else {
279 if (nmp->nm_sotype != SOCK_STREAM)
280 panic("nfscon sotype");
281 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
282 MGET(m, M_WAIT, MT_SOOPTS);
283 *mtod(m, int *) = 1;
284 m->m_len = sizeof(int);
285 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m);
286 }
287 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
288 MGET(m, M_WAIT, MT_SOOPTS);
289 *mtod(m, int *) = 1;
290 m->m_len = sizeof(int);
291 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m);
292 }
293 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof (u_long))
294 * 2;
295 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + sizeof (u_long))
296 * 2;
297 }
298 error = soreserve(so, sndreserve, rcvreserve);
299 if (error)
300 goto bad;
301 so->so_rcv.sb_flags |= SB_NOINTR;
302 so->so_snd.sb_flags |= SB_NOINTR;
303
304 /* Initialize other non-zero congestion variables */
305 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] =
306 nmp->nm_srtt[4] = (NFS_TIMEO << 3);
307 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
308 nmp->nm_sdrtt[3] = nmp->nm_sdrtt[4] = 0;
309 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */
310 nmp->nm_sent = 0;
311 nmp->nm_timeouts = 0;
312 return (0);
313
314 bad:
315 nfs_disconnect(nmp);
316 return (error);
317 }
318
319 /*
320 * Reconnect routine:
321 * Called when a connection is broken on a reliable protocol.
322 * - clean up the old socket
323 * - nfs_connect() again
324 * - set R_MUSTRESEND for all outstanding requests on mount point
325 * If this fails the mount point is DEAD!
326 * nb: Must be called with the nfs_sndlock() set on the mount point.
327 */
328 static int
329 nfs_reconnect(rep)
330 register struct nfsreq *rep;
331 {
332 register struct nfsreq *rp;
333 register struct nfsmount *nmp = rep->r_nmp;
334 int error;
335
336 nfs_disconnect(nmp);
337 while ((error = nfs_connect(nmp, rep))) {
338 if (error == EINTR || error == ERESTART)
339 return (EINTR);
340 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
341 }
342
343 /*
344 * Loop through outstanding request list and fix up all requests
345 * on old socket.
346 */
347 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) {
348 if (rp->r_nmp == nmp)
349 rp->r_flags |= R_MUSTRESEND;
350 }
351 return (0);
352 }
353
354 /*
355 * NFS disconnect. Clean up and unlink.
356 */
357 void
358 nfs_disconnect(nmp)
359 register struct nfsmount *nmp;
360 {
361 register struct socket *so;
362
363 if (nmp->nm_so) {
364 so = nmp->nm_so;
365 nmp->nm_so = (struct socket *)0;
366 soshutdown(so, 2);
367 soclose(so);
368 }
369 }
370
371 /*
372 * This is the nfs send routine. For connection based socket types, it
373 * must be called with an nfs_sndlock() on the socket.
374 * "rep == NULL" indicates that it has been called from a server.
375 * For the client side:
376 * - return EINTR if the RPC is terminated, 0 otherwise
377 * - set R_MUSTRESEND if the send fails for any reason
378 * - do any cleanup required by recoverable socket errors (???)
379 * For the server side:
380 * - return EINTR or ERESTART if interrupted by a signal
381 * - return EPIPE if a connection is lost for connection based sockets (TCP...)
382 * - do any cleanup required by recoverable socket errors (???)
383 */
384 int
385 nfs_send(so, nam, top, rep)
386 register struct socket *so;
387 struct mbuf *nam;
388 register struct mbuf *top;
389 struct nfsreq *rep;
390 {
391 struct mbuf *sendnam;
392 int error, soflags, flags;
393
394 if (rep) {
395 if (rep->r_flags & R_SOFTTERM) {
396 m_freem(top);
397 return (EINTR);
398 }
399 if ((so = rep->r_nmp->nm_so) == NULL) {
400 rep->r_flags |= R_MUSTRESEND;
401 m_freem(top);
402 return (0);
403 }
404 rep->r_flags &= ~R_MUSTRESEND;
405 soflags = rep->r_nmp->nm_soflags;
406 } else
407 soflags = so->so_proto->pr_flags;
408 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
409 sendnam = (struct mbuf *)0;
410 else
411 sendnam = nam;
412 if (so->so_type == SOCK_SEQPACKET)
413 flags = MSG_EOR;
414 else
415 flags = 0;
416
417 error = sosend(so, sendnam, (struct uio *)0, top,
418 (struct mbuf *)0, flags);
419 if (error) {
420 if (rep) {
421 log(LOG_INFO, "nfs send error %d for server %s\n",error,
422 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
423 /*
424 * Deal with errors for the client side.
425 */
426 if (rep->r_flags & R_SOFTTERM)
427 error = EINTR;
428 else
429 rep->r_flags |= R_MUSTRESEND;
430 } else
431 log(LOG_INFO, "nfsd send error %d\n", error);
432
433 /*
434 * Handle any recoverable (soft) socket errors here. (???)
435 */
436 if (error != EINTR && error != ERESTART &&
437 error != EWOULDBLOCK && error != EPIPE)
438 error = 0;
439 }
440 return (error);
441 }
442
443 /*
444 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
445 * done by soreceive(), but for SOCK_STREAM we must deal with the Record
446 * Mark and consolidate the data into a new mbuf list.
447 * nb: Sometimes TCP passes the data up to soreceive() in long lists of
448 * small mbufs.
449 * For SOCK_STREAM we must be very careful to read an entire record once
450 * we have read any of it, even if the system call has been interrupted.
451 */
452 static int
453 nfs_receive(rep, aname, mp)
454 register struct nfsreq *rep;
455 struct mbuf **aname;
456 struct mbuf **mp;
457 {
458 register struct socket *so;
459 struct uio auio;
460 struct iovec aio;
461 register struct mbuf *m;
462 struct mbuf *control;
463 u_long len;
464 struct mbuf **getnam;
465 int error, sotype, rcvflg;
466 struct proc *p = curproc; /* XXX */
467
468 /*
469 * Set up arguments for soreceive()
470 */
471 *mp = (struct mbuf *)0;
472 *aname = (struct mbuf *)0;
473 sotype = rep->r_nmp->nm_sotype;
474
475 /*
476 * For reliable protocols, lock against other senders/receivers
477 * in case a reconnect is necessary.
478 * For SOCK_STREAM, first get the Record Mark to find out how much
479 * more there is to get.
480 * We must lock the socket against other receivers
481 * until we have an entire rpc request/reply.
482 */
483 if (sotype != SOCK_DGRAM) {
484 error = nfs_sndlock(&rep->r_nmp->nm_flag, rep);
485 if (error)
486 return (error);
487 tryagain:
488 /*
489 * Check for fatal errors and resending request.
490 */
491 /*
492 * Ugh: If a reconnect attempt just happened, nm_so
493 * would have changed. NULL indicates a failed
494 * attempt that has essentially shut down this
495 * mount point.
496 */
497 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
498 nfs_sndunlock(&rep->r_nmp->nm_flag);
499 return (EINTR);
500 }
501 so = rep->r_nmp->nm_so;
502 if (!so) {
503 error = nfs_reconnect(rep);
504 if (error) {
505 nfs_sndunlock(&rep->r_nmp->nm_flag);
506 return (error);
507 }
508 goto tryagain;
509 }
510 while (rep->r_flags & R_MUSTRESEND) {
511 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
512 nfsstats.rpcretries++;
513 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
514 if (error) {
515 if (error == EINTR || error == ERESTART ||
516 (error = nfs_reconnect(rep))) {
517 nfs_sndunlock(&rep->r_nmp->nm_flag);
518 return (error);
519 }
520 goto tryagain;
521 }
522 }
523 nfs_sndunlock(&rep->r_nmp->nm_flag);
524 if (sotype == SOCK_STREAM) {
525 aio.iov_base = (caddr_t) &len;
526 aio.iov_len = sizeof(u_long);
527 auio.uio_iov = &aio;
528 auio.uio_iovcnt = 1;
529 auio.uio_segflg = UIO_SYSSPACE;
530 auio.uio_rw = UIO_READ;
531 auio.uio_offset = 0;
532 auio.uio_resid = sizeof(u_long);
533 auio.uio_procp = p;
534 do {
535 rcvflg = MSG_WAITALL;
536 error = soreceive(so, (struct mbuf **)0, &auio,
537 (struct mbuf **)0, (struct mbuf **)0, &rcvflg);
538 if (error == EWOULDBLOCK && rep) {
539 if (rep->r_flags & R_SOFTTERM)
540 return (EINTR);
541 }
542 } while (error == EWOULDBLOCK);
543 if (!error && auio.uio_resid > 0) {
544 log(LOG_INFO,
545 "short receive (%d/%d) from nfs server %s\n",
546 sizeof(u_long) - auio.uio_resid,
547 sizeof(u_long),
548 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
549 error = EPIPE;
550 }
551 if (error)
552 goto errout;
553 len = ntohl(len) & ~0x80000000;
554 /*
555 * This is SERIOUS! We are out of sync with the sender
556 * and forcing a disconnect/reconnect is all I can do.
557 */
558 if (len > NFS_MAXPACKET) {
559 log(LOG_ERR, "%s (%d) from nfs server %s\n",
560 "impossible packet length",
561 len,
562 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
563 error = EFBIG;
564 goto errout;
565 }
566 auio.uio_resid = len;
567 do {
568 rcvflg = MSG_WAITALL;
569 error = soreceive(so, (struct mbuf **)0,
570 &auio, mp, (struct mbuf **)0, &rcvflg);
571 } while (error == EWOULDBLOCK || error == EINTR ||
572 error == ERESTART);
573 if (!error && auio.uio_resid > 0) {
574 log(LOG_INFO,
575 "short receive (%d/%d) from nfs server %s\n",
576 len - auio.uio_resid, len,
577 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
578 error = EPIPE;
579 }
580 } else {
581 /*
582 * NB: Since uio_resid is big, MSG_WAITALL is ignored
583 * and soreceive() will return when it has either a
584 * control msg or a data msg.
585 * We have no use for control msg., but must grab them
586 * and then throw them away so we know what is going
587 * on.
588 */
589 auio.uio_resid = len = 100000000; /* Anything Big */
590 auio.uio_procp = p;
591 do {
592 rcvflg = 0;
593 error = soreceive(so, (struct mbuf **)0,
594 &auio, mp, &control, &rcvflg);
595 if (control)
596 m_freem(control);
597 if (error == EWOULDBLOCK && rep) {
598 if (rep->r_flags & R_SOFTTERM)
599 return (EINTR);
600 }
601 } while (error == EWOULDBLOCK ||
602 (!error && *mp == NULL && control));
603 if ((rcvflg & MSG_EOR) == 0)
604 printf("Egad!!\n");
605 if (!error && *mp == NULL)
606 error = EPIPE;
607 len -= auio.uio_resid;
608 }
609 errout:
610 if (error && error != EINTR && error != ERESTART) {
611 m_freem(*mp);
612 *mp = (struct mbuf *)0;
613 if (error != EPIPE)
614 log(LOG_INFO,
615 "receive error %d from nfs server %s\n",
616 error,
617 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
618 error = nfs_sndlock(&rep->r_nmp->nm_flag, rep);
619 if (!error)
620 error = nfs_reconnect(rep);
621 if (!error)
622 goto tryagain;
623 }
624 } else {
625 if ((so = rep->r_nmp->nm_so) == NULL)
626 return (EACCES);
627 if (so->so_state & SS_ISCONNECTED)
628 getnam = (struct mbuf **)0;
629 else
630 getnam = aname;
631 auio.uio_resid = len = 1000000;
632 auio.uio_procp = p;
633 do {
634 rcvflg = 0;
635 error = soreceive(so, getnam, &auio, mp,
636 (struct mbuf **)0, &rcvflg);
637 if (error == EWOULDBLOCK &&
638 (rep->r_flags & R_SOFTTERM))
639 return (EINTR);
640 } while (error == EWOULDBLOCK);
641 len -= auio.uio_resid;
642 }
643 if (error) {
644 m_freem(*mp);
645 *mp = (struct mbuf *)0;
646 }
647 /*
648 * Search for any mbufs that are not a multiple of 4 bytes long
649 * or with m_data not longword aligned.
650 * These could cause pointer alignment problems, so copy them to
651 * well aligned mbufs.
652 */
653 nfs_realign(*mp, 5 * NFSX_UNSIGNED);
654 return (error);
655 }
656
657 /*
658 * Implement receipt of reply on a socket.
659 * We must search through the list of received datagrams matching them
660 * with outstanding requests using the xid, until ours is found.
661 */
662 /* ARGSUSED */
663 int
664 nfs_reply(myrep)
665 struct nfsreq *myrep;
666 {
667 register struct nfsreq *rep;
668 register struct nfsmount *nmp = myrep->r_nmp;
669 register long t1;
670 struct mbuf *mrep, *nam, *md;
671 u_long rxid, *tl;
672 caddr_t dpos, cp2;
673 int error;
674
675 /*
676 * Loop around until we get our own reply
677 */
678 for (;;) {
679 /*
680 * Lock against other receivers so that I don't get stuck in
681 * sbwait() after someone else has received my reply for me.
682 * Also necessary for connection based protocols to avoid
683 * race conditions during a reconnect.
684 * If nfs_rcvlock() returns EALREADY, that means that
685 * the reply has already been recieved by another
686 * process and we can return immediately. In this
687 * case, the lock is not taken to avoid races with
688 * other processes.
689 */
690 error = nfs_rcvlock(myrep);
691 if (error == EALREADY)
692 return (0);
693 if (error)
694 return (error);
695 /*
696 * Get the next Rpc reply off the socket
697 */
698 error = nfs_receive(myrep, &nam, &mrep);
699 nfs_rcvunlock(&nmp->nm_flag);
700 if (error) {
701
702 /*
703 * Ignore routing errors on connectionless protocols??
704 */
705 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
706 nmp->nm_so->so_error = 0;
707 if (myrep->r_flags & R_GETONEREP)
708 return (0);
709 continue;
710 }
711 return (error);
712 }
713 if (nam)
714 m_freem(nam);
715
716 /*
717 * Get the xid and check that it is an rpc reply
718 */
719 md = mrep;
720 dpos = mtod(md, caddr_t);
721 nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED);
722 rxid = *tl++;
723 if (*tl != rpc_reply) {
724 #ifndef NFS_NOSERVER
725 if (nmp->nm_flag & NFSMNT_NQNFS) {
726 if (nqnfs_callback(nmp, mrep, md, dpos))
727 nfsstats.rpcinvalid++;
728 } else {
729 nfsstats.rpcinvalid++;
730 m_freem(mrep);
731 }
732 #else
733 nfsstats.rpcinvalid++;
734 m_freem(mrep);
735 #endif
736 nfsmout:
737 if (myrep->r_flags & R_GETONEREP)
738 return (0);
739 continue;
740 }
741
742 /*
743 * Loop through the request list to match up the reply
744 * Iff no match, just drop the datagram
745 */
746 for (rep = nfs_reqq.tqh_first; rep != 0;
747 rep = rep->r_chain.tqe_next) {
748 if (rep->r_mrep == NULL && rxid == rep->r_xid) {
749 /* Found it.. */
750 rep->r_mrep = mrep;
751 rep->r_md = md;
752 rep->r_dpos = dpos;
753 if (nfsrtton) {
754 struct rttl *rt;
755
756 rt = &nfsrtt.rttl[nfsrtt.pos];
757 rt->proc = rep->r_procnum;
758 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
759 rt->sent = nmp->nm_sent;
760 rt->cwnd = nmp->nm_cwnd;
761 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
762 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
763 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
764 rt->tstamp = time;
765 if (rep->r_flags & R_TIMING)
766 rt->rtt = rep->r_rtt;
767 else
768 rt->rtt = 1000000;
769 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
770 }
771 /*
772 * Update congestion window.
773 * Do the additive increase of
774 * one rpc/rtt.
775 */
776 if (nmp->nm_cwnd <= nmp->nm_sent) {
777 nmp->nm_cwnd +=
778 (NFS_CWNDSCALE * NFS_CWNDSCALE +
779 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
780 if (nmp->nm_cwnd > NFS_MAXCWND)
781 nmp->nm_cwnd = NFS_MAXCWND;
782 }
783 rep->r_flags &= ~R_SENT;
784 nmp->nm_sent -= NFS_CWNDSCALE;
785 /*
786 * Update rtt using a gain of 0.125 on the mean
787 * and a gain of 0.25 on the deviation.
788 */
789 if (rep->r_flags & R_TIMING) {
790 /*
791 * Since the timer resolution of
792 * NFS_HZ is so course, it can often
793 * result in r_rtt == 0. Since
794 * r_rtt == N means that the actual
795 * rtt is between N+dt and N+2-dt ticks,
796 * add 1.
797 */
798 t1 = rep->r_rtt + 1;
799 t1 -= (NFS_SRTT(rep) >> 3);
800 NFS_SRTT(rep) += t1;
801 if (t1 < 0)
802 t1 = -t1;
803 t1 -= (NFS_SDRTT(rep) >> 2);
804 NFS_SDRTT(rep) += t1;
805 }
806 nmp->nm_timeouts = 0;
807 break;
808 }
809 }
810 /*
811 * If not matched to a request, drop it.
812 * If it's mine, get out.
813 */
814 if (rep == 0) {
815 nfsstats.rpcunexpected++;
816 m_freem(mrep);
817 } else if (rep == myrep) {
818 if (rep->r_mrep == NULL)
819 panic("nfsreply nil");
820 return (0);
821 }
822 if (myrep->r_flags & R_GETONEREP)
823 return (0);
824 }
825 }
826
827 /*
828 * nfs_request - goes something like this
829 * - fill in request struct
830 * - links it into list
831 * - calls nfs_send() for first transmit
832 * - calls nfs_receive() to get reply
833 * - break down rpc header and return with nfs reply pointed to
834 * by mrep or error
835 * nb: always frees up mreq mbuf list
836 */
837 int
838 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp)
839 struct vnode *vp;
840 struct mbuf *mrest;
841 int procnum;
842 struct proc *procp;
843 struct ucred *cred;
844 struct mbuf **mrp;
845 struct mbuf **mdp;
846 caddr_t *dposp;
847 {
848 register struct mbuf *m, *mrep, *m2;
849 register struct nfsreq *rep;
850 register u_long *tl;
851 register int i;
852 struct nfsmount *nmp;
853 struct mbuf *md, *mheadend;
854 struct nfsnode *np;
855 char nickv[RPCX_NICKVERF];
856 time_t reqtime, waituntil;
857 caddr_t dpos, cp2;
858 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type;
859 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
860 int verf_len, verf_type;
861 u_long xid;
862 u_quad_t frev;
863 char *auth_str, *verf_str;
864 NFSKERBKEY_T key; /* save session key */
865
866 nmp = VFSTONFS(vp->v_mount);
867 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
868 rep->r_nmp = nmp;
869 rep->r_vp = vp;
870 rep->r_procp = procp;
871 rep->r_procnum = procnum;
872 i = 0;
873 m = mrest;
874 while (m) {
875 i += m->m_len;
876 m = m->m_next;
877 }
878 mrest_len = i;
879
880 /*
881 * Get the RPC header with authorization.
882 */
883 kerbauth:
884 verf_str = auth_str = (char *)0;
885 if (nmp->nm_flag & NFSMNT_KERB) {
886 verf_str = nickv;
887 verf_len = sizeof (nickv);
888 auth_type = RPCAUTH_KERB4;
889 bzero((caddr_t)key, sizeof (key));
890 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str,
891 &auth_len, verf_str, verf_len)) {
892 error = nfs_getauth(nmp, rep, cred, &auth_str,
893 &auth_len, verf_str, &verf_len, key);
894 if (error) {
895 free((caddr_t)rep, M_NFSREQ);
896 m_freem(mrest);
897 return (error);
898 }
899 }
900 } else {
901 auth_type = RPCAUTH_UNIX;
902 if (cred->cr_ngroups < 1)
903 panic("nfsreq nogrps");
904 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
905 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
906 5 * NFSX_UNSIGNED;
907 }
908 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len,
909 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid);
910 if (auth_str)
911 free(auth_str, M_TEMP);
912
913 /*
914 * For stream protocols, insert a Sun RPC Record Mark.
915 */
916 if (nmp->nm_sotype == SOCK_STREAM) {
917 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT);
918 *mtod(m, u_long *) = htonl(0x80000000 |
919 (m->m_pkthdr.len - NFSX_UNSIGNED));
920 }
921 rep->r_mreq = m;
922 rep->r_xid = xid;
923 tryagain:
924 if (nmp->nm_flag & NFSMNT_SOFT)
925 rep->r_retry = nmp->nm_retry;
926 else
927 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
928 rep->r_rtt = rep->r_rexmit = 0;
929 if (proct[procnum] > 0)
930 rep->r_flags = R_TIMING;
931 else
932 rep->r_flags = 0;
933 rep->r_mrep = NULL;
934
935 /*
936 * Do the client side RPC.
937 */
938 nfsstats.rpcrequests++;
939 /*
940 * Chain request into list of outstanding requests. Be sure
941 * to put it LAST so timer finds oldest requests first.
942 */
943 s = splsoftclock();
944 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
945
946 /* Get send time for nqnfs */
947 reqtime = time.tv_sec;
948
949 /*
950 * If backing off another request or avoiding congestion, don't
951 * send this one now but let timer do it. If not timing a request,
952 * do it now.
953 */
954 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
955 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
956 nmp->nm_sent < nmp->nm_cwnd)) {
957 splx(s);
958 if (nmp->nm_soflags & PR_CONNREQUIRED)
959 error = nfs_sndlock(&nmp->nm_flag, rep);
960 if (!error) {
961 m2 = m_copym(m, 0, M_COPYALL, M_WAIT);
962 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
963 if (nmp->nm_soflags & PR_CONNREQUIRED)
964 nfs_sndunlock(&nmp->nm_flag);
965 }
966 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
967 nmp->nm_sent += NFS_CWNDSCALE;
968 rep->r_flags |= R_SENT;
969 }
970 } else {
971 splx(s);
972 rep->r_rtt = -1;
973 }
974
975 /*
976 * Wait for the reply from our send or the timer's.
977 */
978 if (!error || error == EPIPE)
979 error = nfs_reply(rep);
980
981 /*
982 * RPC done, unlink the request.
983 */
984 s = splsoftclock();
985 TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
986 splx(s);
987
988 /*
989 * Decrement the outstanding request count.
990 */
991 if (rep->r_flags & R_SENT) {
992 rep->r_flags &= ~R_SENT; /* paranoia */
993 nmp->nm_sent -= NFS_CWNDSCALE;
994 }
995
996 /*
997 * If there was a successful reply and a tprintf msg.
998 * tprintf a response.
999 */
1000 if (!error && (rep->r_flags & R_TPRINTFMSG))
1001 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname,
1002 "is alive again");
1003 mrep = rep->r_mrep;
1004 md = rep->r_md;
1005 dpos = rep->r_dpos;
1006 if (error) {
1007 m_freem(rep->r_mreq);
1008 free((caddr_t)rep, M_NFSREQ);
1009 return (error);
1010 }
1011
1012 /*
1013 * break down the rpc header and check if ok
1014 */
1015 nfsm_dissect(tl, u_long *, 3 * NFSX_UNSIGNED);
1016 if (*tl++ == rpc_msgdenied) {
1017 if (*tl == rpc_mismatch)
1018 error = EOPNOTSUPP;
1019 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1020 if (!failed_auth) {
1021 failed_auth++;
1022 mheadend->m_next = (struct mbuf *)0;
1023 m_freem(mrep);
1024 m_freem(rep->r_mreq);
1025 goto kerbauth;
1026 } else
1027 error = EAUTH;
1028 } else
1029 error = EACCES;
1030 m_freem(mrep);
1031 m_freem(rep->r_mreq);
1032 free((caddr_t)rep, M_NFSREQ);
1033 return (error);
1034 }
1035
1036 /*
1037 * Grab any Kerberos verifier, otherwise just throw it away.
1038 */
1039 verf_type = fxdr_unsigned(int, *tl++);
1040 i = fxdr_unsigned(int, *tl);
1041 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1042 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1043 if (error)
1044 goto nfsmout;
1045 } else if (i > 0)
1046 nfsm_adv(nfsm_rndup(i));
1047 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
1048 /* 0 == ok */
1049 if (*tl == 0) {
1050 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
1051 if (*tl != 0) {
1052 error = fxdr_unsigned(int, *tl);
1053 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1054 error == NFSERR_TRYLATER) {
1055 m_freem(mrep);
1056 error = 0;
1057 waituntil = time.tv_sec + trylater_delay;
1058 while (time.tv_sec < waituntil)
1059 (void) tsleep((caddr_t)&lbolt,
1060 PSOCK, "nqnfstry", 0);
1061 trylater_delay *= nfs_backoff[trylater_cnt];
1062 if (trylater_cnt < 7)
1063 trylater_cnt++;
1064 goto tryagain;
1065 }
1066
1067 /*
1068 * If the File Handle was stale, invalidate the
1069 * lookup cache, just in case.
1070 */
1071 if (error == ESTALE)
1072 cache_purge(vp);
1073 if (nmp->nm_flag & NFSMNT_NFSV3) {
1074 *mrp = mrep;
1075 *mdp = md;
1076 *dposp = dpos;
1077 error |= NFSERR_RETERR;
1078 } else
1079 m_freem(mrep);
1080 m_freem(rep->r_mreq);
1081 free((caddr_t)rep, M_NFSREQ);
1082 return (error);
1083 }
1084
1085 /*
1086 * For nqnfs, get any lease in reply
1087 */
1088 if (nmp->nm_flag & NFSMNT_NQNFS) {
1089 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
1090 if (*tl) {
1091 np = VTONFS(vp);
1092 nqlflag = fxdr_unsigned(int, *tl);
1093 nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED);
1094 cachable = fxdr_unsigned(int, *tl++);
1095 reqtime += fxdr_unsigned(int, *tl++);
1096 if (reqtime > time.tv_sec) {
1097 fxdr_hyper(tl, &frev);
1098 nqnfs_clientlease(nmp, np, nqlflag,
1099 cachable, reqtime, frev);
1100 }
1101 }
1102 }
1103 *mrp = mrep;
1104 *mdp = md;
1105 *dposp = dpos;
1106 m_freem(rep->r_mreq);
1107 FREE((caddr_t)rep, M_NFSREQ);
1108 return (0);
1109 }
1110 m_freem(mrep);
1111 error = EPROTONOSUPPORT;
1112 nfsmout:
1113 m_freem(rep->r_mreq);
1114 free((caddr_t)rep, M_NFSREQ);
1115 return (error);
1116 }
1117
1118 #ifndef NFS_NOSERVER
1119 /*
1120 * Generate the rpc reply header
1121 * siz arg. is used to decide if adding a cluster is worthwhile
1122 */
1123 int
1124 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp)
1125 int siz;
1126 struct nfsrv_descript *nd;
1127 struct nfssvc_sock *slp;
1128 int err;
1129 int cache;
1130 u_quad_t *frev;
1131 struct mbuf **mrq;
1132 struct mbuf **mbp;
1133 caddr_t *bposp;
1134 {
1135 register u_long *tl;
1136 register struct mbuf *mreq;
1137 caddr_t bpos;
1138 struct mbuf *mb, *mb2;
1139
1140 MGETHDR(mreq, M_WAIT, MT_DATA);
1141 mb = mreq;
1142 /*
1143 * If this is a big reply, use a cluster else
1144 * try and leave leading space for the lower level headers.
1145 */
1146 siz += RPC_REPLYSIZ;
1147 if (siz >= MINCLSIZE) {
1148 MCLGET(mreq, M_WAIT);
1149 } else
1150 mreq->m_data += max_hdr;
1151 tl = mtod(mreq, u_long *);
1152 mreq->m_len = 6 * NFSX_UNSIGNED;
1153 bpos = ((caddr_t)tl) + mreq->m_len;
1154 *tl++ = txdr_unsigned(nd->nd_retxid);
1155 *tl++ = rpc_reply;
1156 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1157 *tl++ = rpc_msgdenied;
1158 if (err & NFSERR_AUTHERR) {
1159 *tl++ = rpc_autherr;
1160 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1161 mreq->m_len -= NFSX_UNSIGNED;
1162 bpos -= NFSX_UNSIGNED;
1163 } else {
1164 *tl++ = rpc_mismatch;
1165 *tl++ = txdr_unsigned(RPC_VER2);
1166 *tl = txdr_unsigned(RPC_VER2);
1167 }
1168 } else {
1169 *tl++ = rpc_msgaccepted;
1170
1171 /*
1172 * For Kerberos authentication, we must send the nickname
1173 * verifier back, otherwise just RPCAUTH_NULL.
1174 */
1175 if (nd->nd_flag & ND_KERBFULL) {
1176 register struct nfsuid *nuidp;
1177 struct timeval ktvin, ktvout;
1178
1179 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1180 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1181 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1182 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1183 &nuidp->nu_haddr, nd->nd_nam2)))
1184 break;
1185 }
1186 if (nuidp) {
1187 ktvin.tv_sec =
1188 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1189 ktvin.tv_usec =
1190 txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1191
1192 /*
1193 * Encrypt the timestamp in ecb mode using the
1194 * session key.
1195 */
1196 #ifdef NFSKERB
1197 XXX
1198 #endif
1199
1200 *tl++ = rpc_auth_kerb;
1201 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1202 *tl = ktvout.tv_sec;
1203 nfsm_build(tl, u_long *, 3 * NFSX_UNSIGNED);
1204 *tl++ = ktvout.tv_usec;
1205 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1206 } else {
1207 *tl++ = 0;
1208 *tl++ = 0;
1209 }
1210 } else {
1211 *tl++ = 0;
1212 *tl++ = 0;
1213 }
1214 switch (err) {
1215 case EPROGUNAVAIL:
1216 *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1217 break;
1218 case EPROGMISMATCH:
1219 *tl = txdr_unsigned(RPC_PROGMISMATCH);
1220 nfsm_build(tl, u_long *, 2 * NFSX_UNSIGNED);
1221 if (nd->nd_flag & ND_NQNFS) {
1222 *tl++ = txdr_unsigned(3);
1223 *tl = txdr_unsigned(3);
1224 } else {
1225 *tl++ = txdr_unsigned(2);
1226 *tl = txdr_unsigned(3);
1227 }
1228 break;
1229 case EPROCUNAVAIL:
1230 *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1231 break;
1232 case EBADRPC:
1233 *tl = txdr_unsigned(RPC_GARBAGE);
1234 break;
1235 default:
1236 *tl = 0;
1237 if (err != NFSERR_RETVOID) {
1238 nfsm_build(tl, u_long *, NFSX_UNSIGNED);
1239 if (err)
1240 *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1241 else
1242 *tl = 0;
1243 }
1244 break;
1245 };
1246 }
1247
1248 /*
1249 * For nqnfs, piggyback lease as requested.
1250 */
1251 if ((nd->nd_flag & ND_NQNFS) && err == 0) {
1252 if (nd->nd_flag & ND_LEASE) {
1253 nfsm_build(tl, u_long *, 5 * NFSX_UNSIGNED);
1254 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE);
1255 *tl++ = txdr_unsigned(cache);
1256 *tl++ = txdr_unsigned(nd->nd_duration);
1257 txdr_hyper(frev, tl);
1258 } else {
1259 nfsm_build(tl, u_long *, NFSX_UNSIGNED);
1260 *tl = 0;
1261 }
1262 }
1263 *mrq = mreq;
1264 *mbp = mb;
1265 *bposp = bpos;
1266 if (err != 0 && err != NFSERR_RETVOID)
1267 nfsstats.srvrpc_errs++;
1268 return (0);
1269 }
1270
1271
1272 #endif /* NFS_NOSERVER */
1273 /*
1274 * Nfs timer routine
1275 * Scan the nfsreq list and retranmit any requests that have timed out
1276 * To avoid retransmission attempts on STREAM sockets (in the future) make
1277 * sure to set the r_retry field to 0 (implies nm_retry == 0).
1278 */
1279 void
1280 nfs_timer(arg)
1281 void *arg; /* never used */
1282 {
1283 register struct nfsreq *rep;
1284 register struct mbuf *m;
1285 register struct socket *so;
1286 register struct nfsmount *nmp;
1287 register int timeo;
1288 int s, error;
1289 #ifndef NFS_NOSERVER
1290 static long lasttime = 0;
1291 register struct nfssvc_sock *slp;
1292 u_quad_t cur_usec;
1293 #endif /* NFS_NOSERVER */
1294
1295 s = splnet();
1296 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) {
1297 nmp = rep->r_nmp;
1298 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
1299 continue;
1300 if (nfs_sigintr(nmp, rep, rep->r_procp)) {
1301 rep->r_flags |= R_SOFTTERM;
1302 continue;
1303 }
1304 if (rep->r_rtt >= 0) {
1305 rep->r_rtt++;
1306 if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1307 timeo = nmp->nm_timeo;
1308 else
1309 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1310 if (nmp->nm_timeouts > 0)
1311 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1312 if (rep->r_rtt <= timeo)
1313 continue;
1314 if (nmp->nm_timeouts < 8)
1315 nmp->nm_timeouts++;
1316 }
1317 /*
1318 * Check for server not responding
1319 */
1320 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1321 rep->r_rexmit > nmp->nm_deadthresh) {
1322 nfs_msg(rep->r_procp,
1323 nmp->nm_mountp->mnt_stat.f_mntfromname,
1324 "not responding");
1325 rep->r_flags |= R_TPRINTFMSG;
1326 }
1327 if (rep->r_rexmit >= rep->r_retry) { /* too many */
1328 nfsstats.rpctimeouts++;
1329 rep->r_flags |= R_SOFTTERM;
1330 continue;
1331 }
1332 if (nmp->nm_sotype != SOCK_DGRAM) {
1333 if (++rep->r_rexmit > NFS_MAXREXMIT)
1334 rep->r_rexmit = NFS_MAXREXMIT;
1335 continue;
1336 }
1337 if ((so = nmp->nm_so) == NULL)
1338 continue;
1339
1340 /*
1341 * If there is enough space and the window allows..
1342 * Resend it
1343 * Set r_rtt to -1 in case we fail to send it now.
1344 */
1345 rep->r_rtt = -1;
1346 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1347 ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1348 (rep->r_flags & R_SENT) ||
1349 nmp->nm_sent < nmp->nm_cwnd) &&
1350 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
1351 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1352 error = (*so->so_proto->pr_usrreqs->pru_send)
1353 (so, 0, m, (struct mbuf *)0,
1354 (struct mbuf *)0);
1355 else
1356 error = (*so->so_proto->pr_usrreqs->pru_send)
1357 (so, 0, m, nmp->nm_nam, (struct mbuf *)0);
1358 if (error) {
1359 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1360 so->so_error = 0;
1361 } else {
1362 /*
1363 * Iff first send, start timing
1364 * else turn timing off, backoff timer
1365 * and divide congestion window by 2.
1366 */
1367 if (rep->r_flags & R_SENT) {
1368 rep->r_flags &= ~R_TIMING;
1369 if (++rep->r_rexmit > NFS_MAXREXMIT)
1370 rep->r_rexmit = NFS_MAXREXMIT;
1371 nmp->nm_cwnd >>= 1;
1372 if (nmp->nm_cwnd < NFS_CWNDSCALE)
1373 nmp->nm_cwnd = NFS_CWNDSCALE;
1374 nfsstats.rpcretries++;
1375 } else {
1376 rep->r_flags |= R_SENT;
1377 nmp->nm_sent += NFS_CWNDSCALE;
1378 }
1379 rep->r_rtt = 0;
1380 }
1381 }
1382 }
1383 #ifndef NFS_NOSERVER
1384 /*
1385 * Call the nqnfs server timer once a second to handle leases.
1386 */
1387 if (lasttime != time.tv_sec) {
1388 lasttime = time.tv_sec;
1389 nqnfs_serverd();
1390 }
1391
1392 /*
1393 * Scan the write gathering queues for writes that need to be
1394 * completed now.
1395 */
1396 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec;
1397 for (slp = nfssvc_sockhead.tqh_first; slp != 0;
1398 slp = slp->ns_chain.tqe_next) {
1399 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1400 nfsrv_wakenfsd(slp);
1401 }
1402 #endif /* NFS_NOSERVER */
1403 splx(s);
1404 timeout(nfs_timer, (void *)0, nfs_ticks);
1405 }
1406
1407
1408 /*
1409 * Test for a termination condition pending on the process.
1410 * This is used for NFSMNT_INT mounts.
1411 */
1412 int
1413 nfs_sigintr(nmp, rep, p)
1414 struct nfsmount *nmp;
1415 struct nfsreq *rep;
1416 register struct proc *p;
1417 {
1418
1419 if (rep && (rep->r_flags & R_SOFTTERM))
1420 return (EINTR);
1421 if (!(nmp->nm_flag & NFSMNT_INT))
1422 return (0);
1423 if (p && p->p_siglist &&
1424 (((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) &
1425 NFSINT_SIGMASK))
1426 return (EINTR);
1427 return (0);
1428 }
1429
1430 /*
1431 * Lock a socket against others.
1432 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
1433 * and also to avoid race conditions between the processes with nfs requests
1434 * in progress when a reconnect is necessary.
1435 */
1436 int
1437 nfs_sndlock(flagp, rep)
1438 register int *flagp;
1439 struct nfsreq *rep;
1440 {
1441 struct proc *p;
1442 int slpflag = 0, slptimeo = 0;
1443
1444 if (rep) {
1445 p = rep->r_procp;
1446 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1447 slpflag = PCATCH;
1448 } else
1449 p = (struct proc *)0;
1450 while (*flagp & NFSMNT_SNDLOCK) {
1451 if (nfs_sigintr(rep->r_nmp, rep, p))
1452 return (EINTR);
1453 *flagp |= NFSMNT_WANTSND;
1454 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck",
1455 slptimeo);
1456 if (slpflag == PCATCH) {
1457 slpflag = 0;
1458 slptimeo = 2 * hz;
1459 }
1460 }
1461 *flagp |= NFSMNT_SNDLOCK;
1462 return (0);
1463 }
1464
1465 /*
1466 * Unlock the stream socket for others.
1467 */
1468 void
1469 nfs_sndunlock(flagp)
1470 register int *flagp;
1471 {
1472
1473 if ((*flagp & NFSMNT_SNDLOCK) == 0)
1474 panic("nfs sndunlock");
1475 *flagp &= ~NFSMNT_SNDLOCK;
1476 if (*flagp & NFSMNT_WANTSND) {
1477 *flagp &= ~NFSMNT_WANTSND;
1478 wakeup((caddr_t)flagp);
1479 }
1480 }
1481
1482 static int
1483 nfs_rcvlock(rep)
1484 register struct nfsreq *rep;
1485 {
1486 register int *flagp = &rep->r_nmp->nm_flag;
1487 int slpflag, slptimeo = 0;
1488
1489 if (*flagp & NFSMNT_INT)
1490 slpflag = PCATCH;
1491 else
1492 slpflag = 0;
1493 while (*flagp & NFSMNT_RCVLOCK) {
1494 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp))
1495 return (EINTR);
1496 *flagp |= NFSMNT_WANTRCV;
1497 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk",
1498 slptimeo);
1499 /*
1500 * If our reply was recieved while we were sleeping,
1501 * then just return without taking the lock to avoid a
1502 * situation where a single iod could 'capture' the
1503 * recieve lock.
1504 */
1505 if (rep->r_mrep != NULL)
1506 return (EALREADY);
1507 if (slpflag == PCATCH) {
1508 slpflag = 0;
1509 slptimeo = 2 * hz;
1510 }
1511 }
1512 *flagp |= NFSMNT_RCVLOCK;
1513 return (0);
1514 }
1515
1516 /*
1517 * Unlock the stream socket for others.
1518 */
1519 static void
1520 nfs_rcvunlock(flagp)
1521 register int *flagp;
1522 {
1523
1524 if ((*flagp & NFSMNT_RCVLOCK) == 0)
1525 panic("nfs rcvunlock");
1526 *flagp &= ~NFSMNT_RCVLOCK;
1527 if (*flagp & NFSMNT_WANTRCV) {
1528 *flagp &= ~NFSMNT_WANTRCV;
1529 wakeup((caddr_t)flagp);
1530 }
1531 }
1532
1533 /*
1534 * Check for badly aligned mbuf data areas and
1535 * realign data in an mbuf list by copying the data areas up, as required.
1536 */
1537 static void
1538 nfs_realign(m, hsiz)
1539 register struct mbuf *m;
1540 int hsiz;
1541 {
1542 register struct mbuf *m2;
1543 register int siz, mlen, olen;
1544 register caddr_t tcp, fcp;
1545 struct mbuf *mnew;
1546
1547 while (m) {
1548 /*
1549 * This never happens for UDP, rarely happens for TCP
1550 * but frequently happens for iso transport.
1551 */
1552 if ((m->m_len & 0x3) || (mtod(m, int) & 0x3)) {
1553 olen = m->m_len;
1554 fcp = mtod(m, caddr_t);
1555 if ((int)fcp & 0x3) {
1556 m->m_flags &= ~M_PKTHDR;
1557 if (m->m_flags & M_EXT)
1558 m->m_data = m->m_ext.ext_buf +
1559 ((m->m_ext.ext_size - olen) & ~0x3);
1560 else
1561 m->m_data = m->m_dat;
1562 }
1563 m->m_len = 0;
1564 tcp = mtod(m, caddr_t);
1565 mnew = m;
1566 m2 = m->m_next;
1567
1568 /*
1569 * If possible, only put the first invariant part
1570 * of the RPC header in the first mbuf.
1571 */
1572 mlen = M_TRAILINGSPACE(m);
1573 if (olen <= hsiz && mlen > hsiz)
1574 mlen = hsiz;
1575
1576 /*
1577 * Loop through the mbuf list consolidating data.
1578 */
1579 while (m) {
1580 while (olen > 0) {
1581 if (mlen == 0) {
1582 m2->m_flags &= ~M_PKTHDR;
1583 if (m2->m_flags & M_EXT)
1584 m2->m_data = m2->m_ext.ext_buf;
1585 else
1586 m2->m_data = m2->m_dat;
1587 m2->m_len = 0;
1588 mlen = M_TRAILINGSPACE(m2);
1589 tcp = mtod(m2, caddr_t);
1590 mnew = m2;
1591 m2 = m2->m_next;
1592 }
1593 siz = min(mlen, olen);
1594 if (tcp != fcp)
1595 bcopy(fcp, tcp, siz);
1596 mnew->m_len += siz;
1597 mlen -= siz;
1598 olen -= siz;
1599 tcp += siz;
1600 fcp += siz;
1601 }
1602 m = m->m_next;
1603 if (m) {
1604 olen = m->m_len;
1605 fcp = mtod(m, caddr_t);
1606 }
1607 }
1608
1609 /*
1610 * Finally, set m_len == 0 for any trailing mbufs that have
1611 * been copied out of.
1612 */
1613 while (m2) {
1614 m2->m_len = 0;
1615 m2 = m2->m_next;
1616 }
1617 return;
1618 }
1619 m = m->m_next;
1620 }
1621 }
1622
1623 #ifndef NFS_NOSERVER
1624 /*
1625 * Socket upcall routine for the nfsd sockets.
1626 * The caddr_t arg is a pointer to the "struct nfssvc_sock".
1627 * Essentially do as much as possible non-blocking, else punt and it will
1628 * be called with M_WAIT from an nfsd.
1629 */
1630 void
1631 nfsrv_rcv(so, arg, waitflag)
1632 struct socket *so;
1633 caddr_t arg;
1634 int waitflag;
1635 {
1636 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
1637 register struct mbuf *m;
1638 struct mbuf *mp, *nam;
1639 struct uio auio;
1640 int flags, error;
1641
1642 if ((slp->ns_flag & SLP_VALID) == 0)
1643 return;
1644 #ifdef notdef
1645 /*
1646 * Define this to test for nfsds handling this under heavy load.
1647 */
1648 if (waitflag == M_DONTWAIT) {
1649 slp->ns_flag |= SLP_NEEDQ; goto dorecs;
1650 }
1651 #endif
1652 auio.uio_procp = NULL;
1653 if (so->so_type == SOCK_STREAM) {
1654 /*
1655 * If there are already records on the queue, defer soreceive()
1656 * to an nfsd so that there is feedback to the TCP layer that
1657 * the nfs servers are heavily loaded.
1658 */
1659 if (slp->ns_rec && waitflag == M_DONTWAIT) {
1660 slp->ns_flag |= SLP_NEEDQ;
1661 goto dorecs;
1662 }
1663
1664 /*
1665 * Do soreceive().
1666 */
1667 auio.uio_resid = 1000000000;
1668 flags = MSG_DONTWAIT;
1669 error = soreceive(so, &nam, &auio, &mp, (struct mbuf **)0, &flags);
1670 if (error || mp == (struct mbuf *)0) {
1671 if (error == EWOULDBLOCK)
1672 slp->ns_flag |= SLP_NEEDQ;
1673 else
1674 slp->ns_flag |= SLP_DISCONN;
1675 goto dorecs;
1676 }
1677 m = mp;
1678 if (slp->ns_rawend) {
1679 slp->ns_rawend->m_next = m;
1680 slp->ns_cc += 1000000000 - auio.uio_resid;
1681 } else {
1682 slp->ns_raw = m;
1683 slp->ns_cc = 1000000000 - auio.uio_resid;
1684 }
1685 while (m->m_next)
1686 m = m->m_next;
1687 slp->ns_rawend = m;
1688
1689 /*
1690 * Now try and parse record(s) out of the raw stream data.
1691 */
1692 error = nfsrv_getstream(slp, waitflag);
1693 if (error) {
1694 if (error == EPERM)
1695 slp->ns_flag |= SLP_DISCONN;
1696 else
1697 slp->ns_flag |= SLP_NEEDQ;
1698 }
1699 } else {
1700 do {
1701 auio.uio_resid = 1000000000;
1702 flags = MSG_DONTWAIT;
1703 error = soreceive(so, &nam, &auio, &mp,
1704 (struct mbuf **)0, &flags);
1705 if (mp) {
1706 nfs_realign(mp, 10 * NFSX_UNSIGNED);
1707 if (nam) {
1708 m = nam;
1709 m->m_next = mp;
1710 } else
1711 m = mp;
1712 if (slp->ns_recend)
1713 slp->ns_recend->m_nextpkt = m;
1714 else
1715 slp->ns_rec = m;
1716 slp->ns_recend = m;
1717 m->m_nextpkt = (struct mbuf *)0;
1718 }
1719 if (error) {
1720 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
1721 && error != EWOULDBLOCK) {
1722 slp->ns_flag |= SLP_DISCONN;
1723 goto dorecs;
1724 }
1725 }
1726 } while (mp);
1727 }
1728
1729 /*
1730 * Now try and process the request records, non-blocking.
1731 */
1732 dorecs:
1733 if (waitflag == M_DONTWAIT &&
1734 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN))))
1735 nfsrv_wakenfsd(slp);
1736 }
1737
1738 /*
1739 * Try and extract an RPC request from the mbuf data list received on a
1740 * stream socket. The "waitflag" argument indicates whether or not it
1741 * can sleep.
1742 */
1743 static int
1744 nfsrv_getstream(slp, waitflag)
1745 register struct nfssvc_sock *slp;
1746 int waitflag;
1747 {
1748 register struct mbuf *m, **mpp;
1749 register char *cp1, *cp2;
1750 register int len;
1751 struct mbuf *om, *m2, *recm = 0;
1752 u_long recmark;
1753
1754 if (slp->ns_flag & SLP_GETSTREAM)
1755 panic("nfs getstream");
1756 slp->ns_flag |= SLP_GETSTREAM;
1757 for (;;) {
1758 if (slp->ns_reclen == 0) {
1759 if (slp->ns_cc < NFSX_UNSIGNED) {
1760 slp->ns_flag &= ~SLP_GETSTREAM;
1761 return (0);
1762 }
1763 m = slp->ns_raw;
1764 if (m->m_len >= NFSX_UNSIGNED) {
1765 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
1766 m->m_data += NFSX_UNSIGNED;
1767 m->m_len -= NFSX_UNSIGNED;
1768 } else {
1769 cp1 = (caddr_t)&recmark;
1770 cp2 = mtod(m, caddr_t);
1771 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
1772 while (m->m_len == 0) {
1773 m = m->m_next;
1774 cp2 = mtod(m, caddr_t);
1775 }
1776 *cp1++ = *cp2++;
1777 m->m_data++;
1778 m->m_len--;
1779 }
1780 }
1781 slp->ns_cc -= NFSX_UNSIGNED;
1782 recmark = ntohl(recmark);
1783 slp->ns_reclen = recmark & ~0x80000000;
1784 if (recmark & 0x80000000)
1785 slp->ns_flag |= SLP_LASTFRAG;
1786 else
1787 slp->ns_flag &= ~SLP_LASTFRAG;
1788 if (slp->ns_reclen < NFS_MINPACKET || slp->ns_reclen > NFS_MAXPACKET) {
1789 slp->ns_flag &= ~SLP_GETSTREAM;
1790 return (EPERM);
1791 }
1792 }
1793
1794 /*
1795 * Now get the record part.
1796 */
1797 if (slp->ns_cc == slp->ns_reclen) {
1798 recm = slp->ns_raw;
1799 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
1800 slp->ns_cc = slp->ns_reclen = 0;
1801 } else if (slp->ns_cc > slp->ns_reclen) {
1802 len = 0;
1803 m = slp->ns_raw;
1804 om = (struct mbuf *)0;
1805 while (len < slp->ns_reclen) {
1806 if ((len + m->m_len) > slp->ns_reclen) {
1807 m2 = m_copym(m, 0, slp->ns_reclen - len,
1808 waitflag);
1809 if (m2) {
1810 if (om) {
1811 om->m_next = m2;
1812 recm = slp->ns_raw;
1813 } else
1814 recm = m2;
1815 m->m_data += slp->ns_reclen - len;
1816 m->m_len -= slp->ns_reclen - len;
1817 len = slp->ns_reclen;
1818 } else {
1819 slp->ns_flag &= ~SLP_GETSTREAM;
1820 return (EWOULDBLOCK);
1821 }
1822 } else if ((len + m->m_len) == slp->ns_reclen) {
1823 om = m;
1824 len += m->m_len;
1825 m = m->m_next;
1826 recm = slp->ns_raw;
1827 om->m_next = (struct mbuf *)0;
1828 } else {
1829 om = m;
1830 len += m->m_len;
1831 m = m->m_next;
1832 }
1833 }
1834 slp->ns_raw = m;
1835 slp->ns_cc -= len;
1836 slp->ns_reclen = 0;
1837 } else {
1838 slp->ns_flag &= ~SLP_GETSTREAM;
1839 return (0);
1840 }
1841
1842 /*
1843 * Accumulate the fragments into a record.
1844 */
1845 mpp = &slp->ns_frag;
1846 while (*mpp)
1847 mpp = &((*mpp)->m_next);
1848 *mpp = recm;
1849 if (slp->ns_flag & SLP_LASTFRAG) {
1850 nfs_realign(slp->ns_frag, 10 * NFSX_UNSIGNED);
1851 if (slp->ns_recend)
1852 slp->ns_recend->m_nextpkt = slp->ns_frag;
1853 else
1854 slp->ns_rec = slp->ns_frag;
1855 slp->ns_recend = slp->ns_frag;
1856 slp->ns_frag = (struct mbuf *)0;
1857 }
1858 }
1859 }
1860
1861 /*
1862 * Parse an RPC header.
1863 */
1864 int
1865 nfsrv_dorec(slp, nfsd, ndp)
1866 register struct nfssvc_sock *slp;
1867 struct nfsd *nfsd;
1868 struct nfsrv_descript **ndp;
1869 {
1870 register struct mbuf *m, *nam;
1871 register struct nfsrv_descript *nd;
1872 int error;
1873
1874 *ndp = NULL;
1875 if ((slp->ns_flag & SLP_VALID) == 0 ||
1876 (m = slp->ns_rec) == (struct mbuf *)0)
1877 return (ENOBUFS);
1878 slp->ns_rec = m->m_nextpkt;
1879 if (slp->ns_rec)
1880 m->m_nextpkt = (struct mbuf *)0;
1881 else
1882 slp->ns_recend = (struct mbuf *)0;
1883 if (m->m_type == MT_SONAME) {
1884 nam = m;
1885 m = m->m_next;
1886 nam->m_next = NULL;
1887 } else
1888 nam = NULL;
1889 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
1890 M_NFSRVDESC, M_WAITOK);
1891 nd->nd_md = nd->nd_mrep = m;
1892 nd->nd_nam2 = nam;
1893 nd->nd_dpos = mtod(m, caddr_t);
1894 error = nfs_getreq(nd, nfsd, TRUE);
1895 if (error) {
1896 m_freem(nam);
1897 free((caddr_t)nd, M_NFSRVDESC);
1898 return (error);
1899 }
1900 *ndp = nd;
1901 nfsd->nfsd_nd = nd;
1902 return (0);
1903 }
1904
1905 /*
1906 * Parse an RPC request
1907 * - verify it
1908 * - fill in the cred struct.
1909 */
1910 int
1911 nfs_getreq(nd, nfsd, has_header)
1912 register struct nfsrv_descript *nd;
1913 struct nfsd *nfsd;
1914 int has_header;
1915 {
1916 register int len, i;
1917 register u_long *tl;
1918 register long t1;
1919 struct uio uio;
1920 struct iovec iov;
1921 caddr_t dpos, cp2, cp;
1922 u_long nfsvers, auth_type;
1923 uid_t nickuid;
1924 int error = 0, nqnfs = 0, ticklen;
1925 struct mbuf *mrep, *md;
1926 register struct nfsuid *nuidp;
1927 struct timeval tvin, tvout;
1928
1929 mrep = nd->nd_mrep;
1930 md = nd->nd_md;
1931 dpos = nd->nd_dpos;
1932 if (has_header) {
1933 nfsm_dissect(tl, u_long *, 10 * NFSX_UNSIGNED);
1934 nd->nd_retxid = fxdr_unsigned(u_long, *tl++);
1935 if (*tl++ != rpc_call) {
1936 m_freem(mrep);
1937 return (EBADRPC);
1938 }
1939 } else
1940 nfsm_dissect(tl, u_long *, 8 * NFSX_UNSIGNED);
1941 nd->nd_repstat = 0;
1942 nd->nd_flag = 0;
1943 if (*tl++ != rpc_vers) {
1944 nd->nd_repstat = ERPCMISMATCH;
1945 nd->nd_procnum = NFSPROC_NOOP;
1946 return (0);
1947 }
1948 if (*tl != nfs_prog) {
1949 if (*tl == nqnfs_prog)
1950 nqnfs++;
1951 else {
1952 nd->nd_repstat = EPROGUNAVAIL;
1953 nd->nd_procnum = NFSPROC_NOOP;
1954 return (0);
1955 }
1956 }
1957 tl++;
1958 nfsvers = fxdr_unsigned(u_long, *tl++);
1959 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) ||
1960 (nfsvers != NQNFS_VER3 && nqnfs)) {
1961 nd->nd_repstat = EPROGMISMATCH;
1962 nd->nd_procnum = NFSPROC_NOOP;
1963 return (0);
1964 }
1965 if (nqnfs)
1966 nd->nd_flag = (ND_NFSV3 | ND_NQNFS);
1967 else if (nfsvers == NFS_VER3)
1968 nd->nd_flag = ND_NFSV3;
1969 nd->nd_procnum = fxdr_unsigned(u_long, *tl++);
1970 if (nd->nd_procnum == NFSPROC_NULL)
1971 return (0);
1972 if (nd->nd_procnum >= NFS_NPROCS ||
1973 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
1974 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
1975 nd->nd_repstat = EPROCUNAVAIL;
1976 nd->nd_procnum = NFSPROC_NOOP;
1977 return (0);
1978 }
1979 if ((nd->nd_flag & ND_NFSV3) == 0)
1980 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
1981 auth_type = *tl++;
1982 len = fxdr_unsigned(int, *tl++);
1983 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1984 m_freem(mrep);
1985 return (EBADRPC);
1986 }
1987
1988 nd->nd_flag &= ~ND_KERBAUTH;
1989 /*
1990 * Handle auth_unix or auth_kerb.
1991 */
1992 if (auth_type == rpc_auth_unix) {
1993 len = fxdr_unsigned(int, *++tl);
1994 if (len < 0 || len > NFS_MAXNAMLEN) {
1995 m_freem(mrep);
1996 return (EBADRPC);
1997 }
1998 nfsm_adv(nfsm_rndup(len));
1999 nfsm_dissect(tl, u_long *, 3 * NFSX_UNSIGNED);
2000 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
2001 nd->nd_cr.cr_ref = 1;
2002 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
2003 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
2004 len = fxdr_unsigned(int, *tl);
2005 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
2006 m_freem(mrep);
2007 return (EBADRPC);
2008 }
2009 nfsm_dissect(tl, u_long *, (len + 2) * NFSX_UNSIGNED);
2010 for (i = 1; i <= len; i++)
2011 if (i < NGROUPS)
2012 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
2013 else
2014 tl++;
2015 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
2016 if (nd->nd_cr.cr_ngroups > 1)
2017 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
2018 len = fxdr_unsigned(int, *++tl);
2019 if (len < 0 || len > RPCAUTH_MAXSIZ) {
2020 m_freem(mrep);
2021 return (EBADRPC);
2022 }
2023 if (len > 0)
2024 nfsm_adv(nfsm_rndup(len));
2025 } else if (auth_type == rpc_auth_kerb) {
2026 switch (fxdr_unsigned(int, *tl++)) {
2027 case RPCAKN_FULLNAME:
2028 ticklen = fxdr_unsigned(int, *tl);
2029 *((u_long *)nfsd->nfsd_authstr) = *tl;
2030 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
2031 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
2032 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
2033 m_freem(mrep);
2034 return (EBADRPC);
2035 }
2036 uio.uio_offset = 0;
2037 uio.uio_iov = &iov;
2038 uio.uio_iovcnt = 1;
2039 uio.uio_segflg = UIO_SYSSPACE;
2040 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
2041 iov.iov_len = RPCAUTH_MAXSIZ - 4;
2042 nfsm_mtouio(&uio, uio.uio_resid);
2043 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED);
2044 if (*tl++ != rpc_auth_kerb ||
2045 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
2046 printf("Bad kerb verifier\n");
2047 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2048 nd->nd_procnum = NFSPROC_NOOP;
2049 return (0);
2050 }
2051 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED);
2052 tl = (u_long *)cp;
2053 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
2054 printf("Not fullname kerb verifier\n");
2055 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2056 nd->nd_procnum = NFSPROC_NOOP;
2057 return (0);
2058 }
2059 cp += NFSX_UNSIGNED;
2060 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
2061 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
2062 nd->nd_flag |= ND_KERBFULL;
2063 nfsd->nfsd_flag |= NFSD_NEEDAUTH;
2064 break;
2065 case RPCAKN_NICKNAME:
2066 if (len != 2 * NFSX_UNSIGNED) {
2067 printf("Kerb nickname short\n");
2068 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
2069 nd->nd_procnum = NFSPROC_NOOP;
2070 return (0);
2071 }
2072 nickuid = fxdr_unsigned(uid_t, *tl);
2073 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED);
2074 if (*tl++ != rpc_auth_kerb ||
2075 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
2076 printf("Kerb nick verifier bad\n");
2077 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2078 nd->nd_procnum = NFSPROC_NOOP;
2079 return (0);
2080 }
2081 nfsm_dissect(tl, u_long *, 3 * NFSX_UNSIGNED);
2082 tvin.tv_sec = *tl++;
2083 tvin.tv_usec = *tl;
2084
2085 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
2086 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
2087 if (nuidp->nu_cr.cr_uid == nickuid &&
2088 (!nd->nd_nam2 ||
2089 netaddr_match(NU_NETFAM(nuidp),
2090 &nuidp->nu_haddr, nd->nd_nam2)))
2091 break;
2092 }
2093 if (!nuidp) {
2094 nd->nd_repstat =
2095 (NFSERR_AUTHERR|AUTH_REJECTCRED);
2096 nd->nd_procnum = NFSPROC_NOOP;
2097 return (0);
2098 }
2099
2100 /*
2101 * Now, decrypt the timestamp using the session key
2102 * and validate it.
2103 */
2104 #ifdef NFSKERB
2105 XXX
2106 #endif
2107
2108 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
2109 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
2110 if (nuidp->nu_expire < time.tv_sec ||
2111 nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
2112 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
2113 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
2114 nuidp->nu_expire = 0;
2115 nd->nd_repstat =
2116 (NFSERR_AUTHERR|AUTH_REJECTVERF);
2117 nd->nd_procnum = NFSPROC_NOOP;
2118 return (0);
2119 }
2120 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
2121 nd->nd_flag |= ND_KERBNICK;
2122 };
2123 } else {
2124 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
2125 nd->nd_procnum = NFSPROC_NOOP;
2126 return (0);
2127 }
2128
2129 /*
2130 * For nqnfs, get piggybacked lease request.
2131 */
2132 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
2133 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
2134 nd->nd_flag |= fxdr_unsigned(int, *tl);
2135 if (nd->nd_flag & ND_LEASE) {
2136 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED);
2137 nd->nd_duration = fxdr_unsigned(int, *tl);
2138 } else
2139 nd->nd_duration = NQ_MINLEASE;
2140 } else
2141 nd->nd_duration = NQ_MINLEASE;
2142 nd->nd_md = md;
2143 nd->nd_dpos = dpos;
2144 return (0);
2145 nfsmout:
2146 return (error);
2147 }
2148
2149 /*
2150 * Search for a sleeping nfsd and wake it up.
2151 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
2152 * running nfsds will go look for the work in the nfssvc_sock list.
2153 */
2154 void
2155 nfsrv_wakenfsd(slp)
2156 struct nfssvc_sock *slp;
2157 {
2158 register struct nfsd *nd;
2159
2160 if ((slp->ns_flag & SLP_VALID) == 0)
2161 return;
2162 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) {
2163 if (nd->nfsd_flag & NFSD_WAITING) {
2164 nd->nfsd_flag &= ~NFSD_WAITING;
2165 if (nd->nfsd_slp)
2166 panic("nfsd wakeup");
2167 slp->ns_sref++;
2168 nd->nfsd_slp = slp;
2169 wakeup((caddr_t)nd);
2170 return;
2171 }
2172 }
2173 slp->ns_flag |= SLP_DOREC;
2174 nfsd_head_flag |= NFSD_CHECKSLP;
2175 }
2176 #endif /* NFS_NOSERVER */
2177
2178 static int
2179 nfs_msg(p, server, msg)
2180 struct proc *p;
2181 char *server, *msg;
2182 {
2183 tpr_t tpr;
2184
2185 if (p)
2186 tpr = tprintf_open(p);
2187 else
2188 tpr = NULL;
2189 tprintf(tpr, "nfs server %s: %s\n", server, msg);
2190 tprintf_close(tpr);
2191 return (0);
2192 }
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