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HAMMER VFS - Fix serious bug when downgrading (and later upgrading) a PFS
[dragonfly.git] / sys / vfs / nfs / nfs_socket.c
blob2b71044469769540e5a977f1bf788f2ca97f5b73
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 if (nmp->nm_rxstate >= NFSSVC_STOPPING)
365 return (EINTR);
366 while ((error = nfs_connect(nmp, rep)) != 0) {
367 if (error == EINTR || error == ERESTART)
368 return (EINTR);
369 if (error == EINVAL)
370 return (error);
371 if (nmp->nm_rxstate >= NFSSVC_STOPPING)
372 return (EINTR);
373 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
374 }
375
376 /*
377 * Loop through outstanding request list and fix up all requests
378 * on old socket.
379 */
380 crit_enter();
381 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
382 KKASSERT(req->r_nmp == nmp);
383 req->r_flags |= R_NEEDSXMIT;
384 }
385 crit_exit();
386 return (0);
387 }
388
389 /*
390 * NFS disconnect. Clean up and unlink.
391 */
392 void
393 nfs_disconnect(struct nfsmount *nmp)
394 {
395 struct socket *so;
396
397 if (nmp->nm_so) {
398 so = nmp->nm_so;
399 nmp->nm_so = NULL;
400 soshutdown(so, SHUT_RDWR);
401 soclose(so, FNONBLOCK);
402 }
403 }
404
405 void
406 nfs_safedisconnect(struct nfsmount *nmp)
407 {
408 nfs_rcvlock(nmp, NULL);
409 nfs_disconnect(nmp);
410 nfs_rcvunlock(nmp);
411 }
412
413 /*
414 * This is the nfs send routine. For connection based socket types, it
415 * must be called with an nfs_sndlock() on the socket.
416 * "rep == NULL" indicates that it has been called from a server.
417 * For the client side:
418 * - return EINTR if the RPC is terminated, 0 otherwise
419 * - set R_NEEDSXMIT if the send fails for any reason
420 * - do any cleanup required by recoverable socket errors (?)
421 * For the server side:
422 * - return EINTR or ERESTART if interrupted by a signal
423 * - return EPIPE if a connection is lost for connection based sockets (TCP...)
424 * - do any cleanup required by recoverable socket errors (?)
425 */
426 int
427 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top,
428 struct nfsreq *rep)
429 {
430 struct sockaddr *sendnam;
431 int error, soflags, flags;
432
433 if (rep) {
434 if (rep->r_flags & R_SOFTTERM) {
435 m_freem(top);
436 return (EINTR);
437 }
438 if ((so = rep->r_nmp->nm_so) == NULL) {
439 rep->r_flags |= R_NEEDSXMIT;
440 m_freem(top);
441 return (0);
442 }
443 rep->r_flags &= ~R_NEEDSXMIT;
444 soflags = rep->r_nmp->nm_soflags;
445 } else {
446 soflags = so->so_proto->pr_flags;
447 }
448 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
449 sendnam = NULL;
450 else
451 sendnam = nam;
452 if (so->so_type == SOCK_SEQPACKET)
453 flags = MSG_EOR;
454 else
455 flags = 0;
456
457 error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags,
458 curthread /*XXX*/);
459 /*
460 * ENOBUFS for dgram sockets is transient and non fatal.
461 * No need to log, and no need to break a soft mount.
462 */
463 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
464 error = 0;
465 /*
466 * do backoff retransmit on client
467 */
468 if (rep) {
469 if ((rep->r_nmp->nm_state & NFSSTA_SENDSPACE) == 0) {
470 rep->r_nmp->nm_state |= NFSSTA_SENDSPACE;
471 kprintf("Warning: NFS: Insufficient sendspace "
472 "(%lu),\n"
473 "\t You must increase vfs.nfs.soreserve"
474 "or decrease vfs.nfs.maxasyncbio\n",
475 so->so_snd.ssb_hiwat);
476 }
477 rep->r_flags |= R_NEEDSXMIT;
478 }
479 }
480
481 if (error) {
482 if (rep) {
483 log(LOG_INFO, "nfs send error %d for server %s\n",error,
484 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
485 /*
486 * Deal with errors for the client side.
487 */
488 if (rep->r_flags & R_SOFTTERM)
489 error = EINTR;
490 else
491 rep->r_flags |= R_NEEDSXMIT;
492 } else {
493 log(LOG_INFO, "nfsd send error %d\n", error);
494 }
495
496 /*
497 * Handle any recoverable (soft) socket errors here. (?)
498 */
499 if (error != EINTR && error != ERESTART &&
500 error != EWOULDBLOCK && error != EPIPE)
501 error = 0;
502 }
503 return (error);
504 }
505
506 /*
507 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
508 * done by soreceive(), but for SOCK_STREAM we must deal with the Record
509 * Mark and consolidate the data into a new mbuf list.
510 * nb: Sometimes TCP passes the data up to soreceive() in long lists of
511 * small mbufs.
512 * For SOCK_STREAM we must be very careful to read an entire record once
513 * we have read any of it, even if the system call has been interrupted.
514 */
515 static int
516 nfs_receive(struct nfsmount *nmp, struct nfsreq *rep,
517 struct sockaddr **aname, struct mbuf **mp)
518 {
519 struct socket *so;
520 struct sockbuf sio;
521 struct uio auio;
522 struct iovec aio;
523 struct mbuf *m;
524 struct mbuf *control;
525 u_int32_t len;
526 struct sockaddr **getnam;
527 int error, sotype, rcvflg;
528 struct thread *td = curthread; /* XXX */
529
530 /*
531 * Set up arguments for soreceive()
532 */
533 *mp = NULL;
534 *aname = NULL;
535 sotype = nmp->nm_sotype;
536
537 /*
538 * For reliable protocols, lock against other senders/receivers
539 * in case a reconnect is necessary.
540 * For SOCK_STREAM, first get the Record Mark to find out how much
541 * more there is to get.
542 * We must lock the socket against other receivers
543 * until we have an entire rpc request/reply.
544 */
545 if (sotype != SOCK_DGRAM) {
546 error = nfs_sndlock(nmp, rep);
547 if (error)
548 return (error);
549 tryagain:
550 /*
551 * Check for fatal errors and resending request.
552 */
553 /*
554 * Ugh: If a reconnect attempt just happened, nm_so
555 * would have changed. NULL indicates a failed
556 * attempt that has essentially shut down this
557 * mount point.
558 */
559 if (rep && (rep->r_mrep || (rep->r_flags & R_SOFTTERM))) {
560 nfs_sndunlock(nmp);
561 return (EINTR);
562 }
563 so = nmp->nm_so;
564 if (so == NULL) {
565 error = nfs_reconnect(nmp, rep);
566 if (error) {
567 nfs_sndunlock(nmp);
568 return (error);
569 }
570 goto tryagain;
571 }
572 while (rep && (rep->r_flags & R_NEEDSXMIT)) {
573 m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT);
574 nfsstats.rpcretries++;
575 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
576 if (error) {
577 if (error == EINTR || error == ERESTART ||
578 (error = nfs_reconnect(nmp, rep)) != 0) {
579 nfs_sndunlock(nmp);
580 return (error);
581 }
582 goto tryagain;
583 }
584 }
585 nfs_sndunlock(nmp);
586 if (sotype == SOCK_STREAM) {
587 /*
588 * Get the length marker from the stream
589 */
590 aio.iov_base = (caddr_t)&len;
591 aio.iov_len = sizeof(u_int32_t);
592 auio.uio_iov = &aio;
593 auio.uio_iovcnt = 1;
594 auio.uio_segflg = UIO_SYSSPACE;
595 auio.uio_rw = UIO_READ;
596 auio.uio_offset = 0;
597 auio.uio_resid = sizeof(u_int32_t);
598 auio.uio_td = td;
599 do {
600 rcvflg = MSG_WAITALL;
601 error = so_pru_soreceive(so, NULL, &auio, NULL,
602 NULL, &rcvflg);
603 if (error == EWOULDBLOCK && rep) {
604 if (rep->r_flags & R_SOFTTERM)
605 return (EINTR);
606 }
607 } while (error == EWOULDBLOCK);
608
609 if (error == 0 && auio.uio_resid > 0) {
610 /*
611 * Only log short packets if not EOF
612 */
613 if (auio.uio_resid != sizeof(u_int32_t))
614 log(LOG_INFO,
615 "short receive (%d/%d) from nfs server %s\n",
616 (int)(sizeof(u_int32_t) - auio.uio_resid),
617 (int)sizeof(u_int32_t),
618 nmp->nm_mountp->mnt_stat.f_mntfromname);
619 error = EPIPE;
620 }
621 if (error)
622 goto errout;
623 len = ntohl(len) & ~0x80000000;
624 /*
625 * This is SERIOUS! We are out of sync with the sender
626 * and forcing a disconnect/reconnect is all I can do.
627 */
628 if (len > NFS_MAXPACKET) {
629 log(LOG_ERR, "%s (%d) from nfs server %s\n",
630 "impossible packet length",
631 len,
632 nmp->nm_mountp->mnt_stat.f_mntfromname);
633 error = EFBIG;
634 goto errout;
635 }
636
637 /*
638 * Get the rest of the packet as an mbuf chain
639 */
640 sbinit(&sio, len);
641 do {
642 rcvflg = MSG_WAITALL;
643 error = so_pru_soreceive(so, NULL, NULL, &sio,
644 NULL, &rcvflg);
645 } while (error == EWOULDBLOCK || error == EINTR ||
646 error == ERESTART);
647 if (error == 0 && sio.sb_cc != len) {
648 if (sio.sb_cc != 0)
649 log(LOG_INFO,
650 "short receive (%zu/%d) from nfs server %s\n",
651 (size_t)len - auio.uio_resid, len,
652 nmp->nm_mountp->mnt_stat.f_mntfromname);
653 error = EPIPE;
654 }
655 *mp = sio.sb_mb;
656 } else {
657 /*
658 * Non-stream, so get the whole packet by not
659 * specifying MSG_WAITALL and by specifying a large
660 * length.
661 *
662 * We have no use for control msg., but must grab them
663 * and then throw them away so we know what is going
664 * on.
665 */
666 sbinit(&sio, 100000000);
667 do {
668 rcvflg = 0;
669 error = so_pru_soreceive(so, NULL, NULL, &sio,
670 &control, &rcvflg);
671 if (control)
672 m_freem(control);
673 if (error == EWOULDBLOCK && rep) {
674 if (rep->r_flags & R_SOFTTERM) {
675 m_freem(sio.sb_mb);
676 return (EINTR);
677 }
678 }
679 } while (error == EWOULDBLOCK ||
680 (error == 0 && sio.sb_mb == NULL && control));
681 if ((rcvflg & MSG_EOR) == 0)
682 kprintf("Egad!!\n");
683 if (error == 0 && sio.sb_mb == NULL)
684 error = EPIPE;
685 len = sio.sb_cc;
686 *mp = sio.sb_mb;
687 }
688 errout:
689 if (error && error != EINTR && error != ERESTART) {
690 m_freem(*mp);
691 *mp = NULL;
692 if (error != EPIPE) {
693 log(LOG_INFO,
694 "receive error %d from nfs server %s\n",
695 error,
696 nmp->nm_mountp->mnt_stat.f_mntfromname);
697 }
698 error = nfs_sndlock(nmp, rep);
699 if (!error) {
700 error = nfs_reconnect(nmp, rep);
701 if (!error)
702 goto tryagain;
703 else
704 nfs_sndunlock(nmp);
705 }
706 }
707 } else {
708 if ((so = nmp->nm_so) == NULL)
709 return (EACCES);
710 if (so->so_state & SS_ISCONNECTED)
711 getnam = NULL;
712 else
713 getnam = aname;
714 sbinit(&sio, 100000000);
715 do {
716 rcvflg = 0;
717 error = so_pru_soreceive(so, getnam, NULL, &sio,
718 NULL, &rcvflg);
719 if (error == EWOULDBLOCK && rep &&
720 (rep->r_flags & R_SOFTTERM)) {
721 m_freem(sio.sb_mb);
722 return (EINTR);
723 }
724 } while (error == EWOULDBLOCK);
725
726 len = sio.sb_cc;
727 *mp = sio.sb_mb;
728
729 /*
730 * A shutdown may result in no error and no mbuf.
731 * Convert to EPIPE.
732 */
733 if (*mp == NULL && error == 0)
734 error = EPIPE;
735 }
736 if (error) {
737 m_freem(*mp);
738 *mp = NULL;
739 }
740
741 /*
742 * Search for any mbufs that are not a multiple of 4 bytes long
743 * or with m_data not longword aligned.
744 * These could cause pointer alignment problems, so copy them to
745 * well aligned mbufs.
746 */
747 nfs_realign(mp, 5 * NFSX_UNSIGNED);
748 return (error);
749 }
750
751 /*
752 * Implement receipt of reply on a socket.
753 *
754 * We must search through the list of received datagrams matching them
755 * with outstanding requests using the xid, until ours is found.
756 *
757 * If myrep is NULL we process packets on the socket until
758 * interrupted or until nm_reqrxq is non-empty.
759 */
760 /* ARGSUSED */
761 int
762 nfs_reply(struct nfsmount *nmp, struct nfsreq *myrep)
763 {
764 struct nfsreq *rep;
765 struct sockaddr *nam;
766 u_int32_t rxid;
767 u_int32_t *tl;
768 int error;
769 struct nfsm_info info;
770
771 /*
772 * Loop around until we get our own reply
773 */
774 for (;;) {
775 /*
776 * Lock against other receivers so that I don't get stuck in
777 * sbwait() after someone else has received my reply for me.
778 * Also necessary for connection based protocols to avoid
779 * race conditions during a reconnect.
780 *
781 * If nfs_rcvlock() returns EALREADY, that means that
782 * the reply has already been recieved by another
783 * process and we can return immediately. In this
784 * case, the lock is not taken to avoid races with
785 * other processes.
786 */
787 info.mrep = NULL;
788
789 error = nfs_rcvlock(nmp, myrep);
790 if (error == EALREADY)
791 return (0);
792 if (error)
793 return (error);
794
795 /*
796 * If myrep is NULL we are the receiver helper thread.
797 * Stop waiting for incoming replies if there are
798 * messages sitting on reqrxq that we need to process,
799 * or if a shutdown request is pending.
800 */
801 if (myrep == NULL && (TAILQ_FIRST(&nmp->nm_reqrxq) ||
802 nmp->nm_rxstate > NFSSVC_PENDING)) {
803 nfs_rcvunlock(nmp);
804 return(EWOULDBLOCK);
805 }
806
807 /*
808 * Get the next Rpc reply off the socket
809 *
810 * We cannot release the receive lock until we've
811 * filled in rep->r_mrep, otherwise a waiting
812 * thread may deadlock in soreceive with no incoming
813 * packets expected.
814 */
815 error = nfs_receive(nmp, myrep, &nam, &info.mrep);
816 if (error) {
817 /*
818 * Ignore routing errors on connectionless protocols??
819 */
820 nfs_rcvunlock(nmp);
821 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
822 if (nmp->nm_so == NULL)
823 return (error);
824 nmp->nm_so->so_error = 0;
825 continue;
826 }
827 return (error);
828 }
829 if (nam)
830 FREE(nam, M_SONAME);
831
832 /*
833 * Get the xid and check that it is an rpc reply
834 */
835 info.md = info.mrep;
836 info.dpos = mtod(info.md, caddr_t);
837 NULLOUT(tl = nfsm_dissect(&info, 2*NFSX_UNSIGNED));
838 rxid = *tl++;
839 if (*tl != rpc_reply) {
840 nfsstats.rpcinvalid++;
841 m_freem(info.mrep);
842 info.mrep = NULL;
843 nfsmout:
844 nfs_rcvunlock(nmp);
845 continue;
846 }
847
848 /*
849 * Loop through the request list to match up the reply
850 * Iff no match, just drop the datagram. On match, set
851 * r_mrep atomically to prevent the timer from messing
852 * around with the request after we have exited the critical
853 * section.
854 */
855 crit_enter();
856 TAILQ_FOREACH(rep, &nmp->nm_reqq, r_chain) {
857 if (rep->r_mrep == NULL && rxid == rep->r_xid)
858 break;
859 }
860
861 /*
862 * Fill in the rest of the reply if we found a match.
863 *
864 * Deal with duplicate responses if there was no match.
865 */
866 if (rep) {
867 rep->r_md = info.md;
868 rep->r_dpos = info.dpos;
869 if (nfsrtton) {
870 struct rttl *rt;
871
872 rt = &nfsrtt.rttl[nfsrtt.pos];
873 rt->proc = rep->r_procnum;
874 rt->rto = 0;
875 rt->sent = 0;
876 rt->cwnd = nmp->nm_maxasync_scaled;
877 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
878 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
879 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
880 getmicrotime(&rt->tstamp);
881 if (rep->r_flags & R_TIMING)
882 rt->rtt = rep->r_rtt;
883 else
884 rt->rtt = 1000000;
885 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
886 }
887
888 /*
889 * New congestion control is based only on async
890 * requests.
891 */
892 if (nmp->nm_maxasync_scaled < NFS_MAXASYNC_SCALED)
893 ++nmp->nm_maxasync_scaled;
894 if (rep->r_flags & R_SENT) {
895 rep->r_flags &= ~R_SENT;
896 }
897 /*
898 * Update rtt using a gain of 0.125 on the mean
899 * and a gain of 0.25 on the deviation.
900 *
901 * NOTE SRTT/SDRTT are only good if R_TIMING is set.
902 */
903 if ((rep->r_flags & R_TIMING) && rep->r_rexmit == 0) {
904 /*
905 * Since the timer resolution of
906 * NFS_HZ is so course, it can often
907 * result in r_rtt == 0. Since
908 * r_rtt == N means that the actual
909 * rtt is between N+dt and N+2-dt ticks,
910 * add 1.
911 */
912 int n;
913 int d;
914
915 #define NFSRSB NFS_RTT_SCALE_BITS
916 n = ((NFS_SRTT(rep) * 7) +
917 (rep->r_rtt << NFSRSB)) >> 3;
918 d = n - NFS_SRTT(rep);
919 NFS_SRTT(rep) = n;
920
921 /*
922 * Don't let the jitter calculation decay
923 * too quickly, but we want a fast rampup.
924 */
925 if (d < 0)
926 d = -d;
927 d <<= NFSRSB;
928 if (d < NFS_SDRTT(rep))
929 n = ((NFS_SDRTT(rep) * 15) + d) >> 4;
930 else
931 n = ((NFS_SDRTT(rep) * 3) + d) >> 2;
932 NFS_SDRTT(rep) = n;
933 #undef NFSRSB
934 }
935 nmp->nm_timeouts = 0;
936 rep->r_mrep = info.mrep;
937 nfs_hardterm(rep, 0);
938 } else {
939 /*
940 * Extract vers, prog, nfsver, procnum. A duplicate
941 * response means we didn't wait long enough so
942 * we increase the SRTT to avoid future spurious
943 * timeouts.
944 */
945 u_int procnum = nmp->nm_lastreprocnum;
946 int n;
947
948 if (procnum < NFS_NPROCS && proct[procnum]) {
949 if (nfs_showrexmit)
950 kprintf("D");
951 n = nmp->nm_srtt[proct[procnum]];
952 n += NFS_ASYSCALE * NFS_HZ;
953 if (n < NFS_ASYSCALE * NFS_HZ * 10)
954 n = NFS_ASYSCALE * NFS_HZ * 10;
955 nmp->nm_srtt[proct[procnum]] = n;
956 }
957 }
958 nfs_rcvunlock(nmp);
959 crit_exit();
960
961 /*
962 * If not matched to a request, drop it.
963 * If it's mine, get out.
964 */
965 if (rep == NULL) {
966 nfsstats.rpcunexpected++;
967 m_freem(info.mrep);
968 info.mrep = NULL;
969 } else if (rep == myrep) {
970 if (rep->r_mrep == NULL)
971 panic("nfsreply nil");
972 return (0);
973 }
974 }
975 }
976
977 /*
978 * Run the request state machine until the target state is reached
979 * or a fatal error occurs. The target state is not run. Specifying
980 * a target of NFSM_STATE_DONE runs the state machine until the rpc
981 * is complete.
982 *
983 * EINPROGRESS is returned for all states other then the DONE state,
984 * indicating that the rpc is still in progress.
985 */
986 int
987 nfs_request(struct nfsm_info *info, nfsm_state_t bstate, nfsm_state_t estate)
988 {
989 struct nfsreq *req;
990
991 while (info->state >= bstate && info->state < estate) {
992 switch(info->state) {
993 case NFSM_STATE_SETUP:
994 /*
995 * Setup the nfsreq. Any error which occurs during
996 * this state is fatal.
997 */
998 info->error = nfs_request_setup(info);
999 if (info->error) {
1000 info->state = NFSM_STATE_DONE;
1001 return (info->error);
1002 } else {
1003 req = info->req;
1004 req->r_mrp = &info->mrep;
1005 req->r_mdp = &info->md;
1006 req->r_dposp = &info->dpos;
1007 info->state = NFSM_STATE_AUTH;
1008 }
1009 break;
1010 case NFSM_STATE_AUTH:
1011 /*
1012 * Authenticate the nfsreq. Any error which occurs
1013 * during this state is fatal.
1014 */
1015 info->error = nfs_request_auth(info->req);
1016 if (info->error) {
1017 info->state = NFSM_STATE_DONE;
1018 return (info->error);
1019 } else {
1020 info->state = NFSM_STATE_TRY;
1021 }
1022 break;
1023 case NFSM_STATE_TRY:
1024 /*
1025 * Transmit or retransmit attempt. An error in this
1026 * state is ignored and we always move on to the
1027 * next state.
1028 *
1029 * This can trivially race the receiver if the
1030 * request is asynchronous. nfs_request_try()
1031 * will thus set the state for us and we
1032 * must also return immediately if we are
1033 * running an async state machine, because
1034 * info can become invalid due to races after
1035 * try() returns.
1036 */
1037 if (info->req->r_flags & R_ASYNC) {
1038 nfs_request_try(info->req);
1039 if (estate == NFSM_STATE_WAITREPLY)
1040 return (EINPROGRESS);
1041 } else {
1042 nfs_request_try(info->req);
1043 info->state = NFSM_STATE_WAITREPLY;
1044 }
1045 break;
1046 case NFSM_STATE_WAITREPLY:
1047 /*
1048 * Wait for a reply or timeout and move on to the
1049 * next state. The error returned by this state
1050 * is passed to the processing code in the next
1051 * state.
1052 */
1053 info->error = nfs_request_waitreply(info->req);
1054 info->state = NFSM_STATE_PROCESSREPLY;
1055 break;
1056 case NFSM_STATE_PROCESSREPLY:
1057 /*
1058 * Process the reply or timeout. Errors which occur
1059 * in this state may cause the state machine to
1060 * go back to an earlier state, and are fatal
1061 * otherwise.
1062 */
1063 info->error = nfs_request_processreply(info,
1064 info->error);
1065 switch(info->error) {
1066 case ENEEDAUTH:
1067 info->state = NFSM_STATE_AUTH;
1068 break;
1069 case EAGAIN:
1070 info->state = NFSM_STATE_TRY;
1071 break;
1072 default:
1073 /*
1074 * Operation complete, with or without an
1075 * error. We are done.
1076 */
1077 info->req = NULL;
1078 info->state = NFSM_STATE_DONE;
1079 return (info->error);
1080 }
1081 break;
1082 case NFSM_STATE_DONE:
1083 /*
1084 * Shouldn't be reached
1085 */
1086 return (info->error);
1087 /* NOT REACHED */
1088 }
1089 }
1090
1091 /*
1092 * If we are done return the error code (if any).
1093 * Otherwise return EINPROGRESS.
1094 */
1095 if (info->state == NFSM_STATE_DONE)
1096 return (info->error);
1097 return (EINPROGRESS);
1098 }
1099
1100 /*
1101 * nfs_request - goes something like this
1102 * - fill in request struct
1103 * - links it into list
1104 * - calls nfs_send() for first transmit
1105 * - calls nfs_receive() to get reply
1106 * - break down rpc header and return with nfs reply pointed to
1107 * by mrep or error
1108 * nb: always frees up mreq mbuf list
1109 */
1110 static int
1111 nfs_request_setup(nfsm_info_t info)
1112 {
1113 struct nfsreq *req;
1114 struct nfsmount *nmp;
1115 struct mbuf *m;
1116 int i;
1117
1118 /*
1119 * Reject requests while attempting a forced unmount.
1120 */
1121 if (info->vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
1122 m_freem(info->mreq);
1123 info->mreq = NULL;
1124 return (ESTALE);
1125 }
1126 nmp = VFSTONFS(info->vp->v_mount);
1127 req = kmalloc(sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
1128 req->r_nmp = nmp;
1129 req->r_vp = info->vp;
1130 req->r_td = info->td;
1131 req->r_procnum = info->procnum;
1132 req->r_mreq = NULL;
1133 req->r_cred = info->cred;
1134
1135 i = 0;
1136 m = info->mreq;
1137 while (m) {
1138 i += m->m_len;
1139 m = m->m_next;
1140 }
1141 req->r_mrest = info->mreq;
1142 req->r_mrest_len = i;
1143
1144 /*
1145 * The presence of a non-NULL r_info in req indicates
1146 * async completion via our helper threads. See the receiver
1147 * code.
1148 */
1149 if (info->bio) {
1150 req->r_info = info;
1151 req->r_flags = R_ASYNC;
1152 } else {
1153 req->r_info = NULL;
1154 req->r_flags = 0;
1155 }
1156 info->req = req;
1157 return(0);
1158 }
1159
1160 static int
1161 nfs_request_auth(struct nfsreq *rep)
1162 {
1163 struct nfsmount *nmp = rep->r_nmp;
1164 struct mbuf *m;
1165 char nickv[RPCX_NICKVERF];
1166 int error = 0, auth_len, auth_type;
1167 int verf_len;
1168 u_int32_t xid;
1169 char *auth_str, *verf_str;
1170 struct ucred *cred;
1171
1172 cred = rep->r_cred;
1173 rep->r_failed_auth = 0;
1174
1175 /*
1176 * Get the RPC header with authorization.
1177 */
1178 verf_str = auth_str = NULL;
1179 if (nmp->nm_flag & NFSMNT_KERB) {
1180 verf_str = nickv;
1181 verf_len = sizeof (nickv);
1182 auth_type = RPCAUTH_KERB4;
1183 bzero((caddr_t)rep->r_key, sizeof(rep->r_key));
1184 if (rep->r_failed_auth ||
1185 nfs_getnickauth(nmp, cred, &auth_str, &auth_len,
1186 verf_str, verf_len)) {
1187 error = nfs_getauth(nmp, rep, cred, &auth_str,
1188 &auth_len, verf_str, &verf_len, rep->r_key);
1189 if (error) {
1190 m_freem(rep->r_mrest);
1191 rep->r_mrest = NULL;
1192 kfree((caddr_t)rep, M_NFSREQ);
1193 return (error);
1194 }
1195 }
1196 } else {
1197 auth_type = RPCAUTH_UNIX;
1198 if (cred->cr_ngroups < 1)
1199 panic("nfsreq nogrps");
1200 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
1201 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
1202 5 * NFSX_UNSIGNED;
1203 }
1204 m = nfsm_rpchead(cred, nmp->nm_flag, rep->r_procnum, auth_type,
1205 auth_len, auth_str, verf_len, verf_str,
1206 rep->r_mrest, rep->r_mrest_len, &rep->r_mheadend, &xid);
1207 rep->r_mrest = NULL;
1208 if (auth_str)
1209 kfree(auth_str, M_TEMP);
1210
1211 /*
1212 * For stream protocols, insert a Sun RPC Record Mark.
1213 */
1214 if (nmp->nm_sotype == SOCK_STREAM) {
1215 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
1216 if (m == NULL) {
1217 kfree(rep, M_NFSREQ);
1218 return (ENOBUFS);
1219 }
1220 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1221 (m->m_pkthdr.len - NFSX_UNSIGNED));
1222 }
1223 rep->r_mreq = m;
1224 rep->r_xid = xid;
1225 return (0);
1226 }
1227
1228 static int
1229 nfs_request_try(struct nfsreq *rep)
1230 {
1231 struct nfsmount *nmp = rep->r_nmp;
1232 struct mbuf *m2;
1233 int error;
1234
1235 /*
1236 * Request is not on any queue, only the owner has access to it
1237 * so it should not be locked by anyone atm.
1238 *
1239 * Interlock to prevent races. While locked the only remote
1240 * action possible is for r_mrep to be set (once we enqueue it).
1241 */
1242 if (rep->r_flags == 0xdeadc0de) {
1243 print_backtrace();
1244 panic("flags nbad\n");
1245 }
1246 KKASSERT((rep->r_flags & (R_LOCKED | R_ONREQQ)) == 0);
1247 if (nmp->nm_flag & NFSMNT_SOFT)
1248 rep->r_retry = nmp->nm_retry;
1249 else
1250 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
1251 rep->r_rtt = rep->r_rexmit = 0;
1252 if (proct[rep->r_procnum] > 0)
1253 rep->r_flags |= R_TIMING | R_LOCKED;
1254 else
1255 rep->r_flags |= R_LOCKED;
1256 rep->r_mrep = NULL;
1257
1258 /*
1259 * Do the client side RPC.
1260 */
1261 nfsstats.rpcrequests++;
1262
1263 if (nmp->nm_flag & NFSMNT_FORCE) {
1264 rep->r_flags |= R_SOFTTERM;
1265 rep->r_flags &= ~R_LOCKED;
1266 return (0);
1267 }
1268
1269 /*
1270 * Chain request into list of outstanding requests. Be sure
1271 * to put it LAST so timer finds oldest requests first. Note
1272 * that our control of R_LOCKED prevents the request from
1273 * getting ripped out from under us or transmitted by the
1274 * timer code.
1275 *
1276 * For requests with info structures we must atomically set the
1277 * info's state because the structure could become invalid upon
1278 * return due to races (i.e., if async)
1279 */
1280 crit_enter();
1281 mtx_link_init(&rep->r_link);
1282 TAILQ_INSERT_TAIL(&nmp->nm_reqq, rep, r_chain);
1283 rep->r_flags |= R_ONREQQ;
1284 ++nmp->nm_reqqlen;
1285 if (rep->r_flags & R_ASYNC)
1286 rep->r_info->state = NFSM_STATE_WAITREPLY;
1287 crit_exit();
1288
1289 error = 0;
1290
1291 /*
1292 * Send if we can. Congestion control is not handled here any more
1293 * becausing trying to defer the initial send based on the nfs_timer
1294 * requires having a very fast nfs_timer, which is silly.
1295 */
1296 if (nmp->nm_so) {
1297 if (nmp->nm_soflags & PR_CONNREQUIRED)
1298 error = nfs_sndlock(nmp, rep);
1299 if (error == 0) {
1300 m2 = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT);
1301 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1302 if (nmp->nm_soflags & PR_CONNREQUIRED)
1303 nfs_sndunlock(nmp);
1304 rep->r_flags &= ~R_NEEDSXMIT;
1305 if ((rep->r_flags & R_SENT) == 0) {
1306 rep->r_flags |= R_SENT;
1307 }
1308 } else {
1309 rep->r_flags |= R_NEEDSXMIT;
1310 }
1311 } else {
1312 rep->r_flags |= R_NEEDSXMIT;
1313 rep->r_rtt = -1;
1314 }
1315 if (error == EPIPE)
1316 error = 0;
1317
1318 /*
1319 * Release the lock. The only remote action that may have occurred
1320 * would have been the setting of rep->r_mrep. If this occured
1321 * and the request was async we have to move it to the reader
1322 * thread's queue for action.
1323 *
1324 * For async requests also make sure the reader is woken up so
1325 * it gets on the socket to read responses.
1326 */
1327 crit_enter();
1328 if (rep->r_flags & R_ASYNC) {
1329 if (rep->r_mrep)
1330 nfs_hardterm(rep, 1);
1331 rep->r_flags &= ~R_LOCKED;
1332 nfssvc_iod_reader_wakeup(nmp);
1333 } else {
1334 rep->r_flags &= ~R_LOCKED;
1335 }
1336 if (rep->r_flags & R_WANTED) {
1337 rep->r_flags &= ~R_WANTED;
1338 wakeup(rep);
1339 }
1340 crit_exit();
1341 return (error);
1342 }
1343
1344 /*
1345 * This code is only called for synchronous requests. Completed synchronous
1346 * requests are left on reqq and we remove them before moving on to the
1347 * processing state.
1348 */
1349 static int
1350 nfs_request_waitreply(struct nfsreq *rep)
1351 {
1352 struct nfsmount *nmp = rep->r_nmp;
1353 int error;
1354
1355 KKASSERT((rep->r_flags & R_ASYNC) == 0);
1356
1357 /*
1358 * Wait until the request is finished.
1359 */
1360 error = nfs_reply(nmp, rep);
1361
1362 /*
1363 * RPC done, unlink the request, but don't rip it out from under
1364 * the callout timer.
1365 *
1366 * Once unlinked no other receiver or the timer will have
1367 * visibility, so we do not have to set R_LOCKED.
1368 */
1369 crit_enter();
1370 while (rep->r_flags & R_LOCKED) {
1371 rep->r_flags |= R_WANTED;
1372 tsleep(rep, 0, "nfstrac", 0);
1373 }
1374 KKASSERT(rep->r_flags & R_ONREQQ);
1375 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain);
1376 rep->r_flags &= ~R_ONREQQ;
1377 --nmp->nm_reqqlen;
1378 if (TAILQ_FIRST(&nmp->nm_bioq) &&
1379 nmp->nm_reqqlen == NFS_MAXASYNCBIO * 2 / 3) {
1380 nfssvc_iod_writer_wakeup(nmp);
1381 }
1382 crit_exit();
1383
1384 /*
1385 * Decrement the outstanding request count.
1386 */
1387 if (rep->r_flags & R_SENT) {
1388 rep->r_flags &= ~R_SENT;
1389 }
1390 return (error);
1391 }
1392
1393 /*
1394 * Process reply with error returned from nfs_requet_waitreply().
1395 *
1396 * Returns EAGAIN if it wants us to loop up to nfs_request_try() again.
1397 * Returns ENEEDAUTH if it wants us to loop up to nfs_request_auth() again.
1398 */
1399 static int
1400 nfs_request_processreply(nfsm_info_t info, int error)
1401 {
1402 struct nfsreq *req = info->req;
1403 struct nfsmount *nmp = req->r_nmp;
1404 u_int32_t *tl;
1405 int verf_type;
1406 int i;
1407
1408 /*
1409 * If there was a successful reply and a tprintf msg.
1410 * tprintf a response.
1411 */
1412 if (error == 0 && (req->r_flags & R_TPRINTFMSG)) {
1413 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1414 "is alive again");
1415 }
1416 info->mrep = req->r_mrep;
1417 info->md = req->r_md;
1418 info->dpos = req->r_dpos;
1419 if (error) {
1420 m_freem(req->r_mreq);
1421 req->r_mreq = NULL;
1422 kfree(req, M_NFSREQ);
1423 info->req = NULL;
1424 return (error);
1425 }
1426
1427 /*
1428 * break down the rpc header and check if ok
1429 */
1430 NULLOUT(tl = nfsm_dissect(info, 3 * NFSX_UNSIGNED));
1431 if (*tl++ == rpc_msgdenied) {
1432 if (*tl == rpc_mismatch) {
1433 error = EOPNOTSUPP;
1434 } else if ((nmp->nm_flag & NFSMNT_KERB) &&
1435 *tl++ == rpc_autherr) {
1436 if (req->r_failed_auth == 0) {
1437 req->r_failed_auth++;
1438 req->r_mheadend->m_next = NULL;
1439 m_freem(info->mrep);
1440 info->mrep = NULL;
1441 m_freem(req->r_mreq);
1442 return (ENEEDAUTH);
1443 } else {
1444 error = EAUTH;
1445 }
1446 } else {
1447 error = EACCES;
1448 }
1449 m_freem(info->mrep);
1450 info->mrep = NULL;
1451 m_freem(req->r_mreq);
1452 req->r_mreq = NULL;
1453 kfree(req, M_NFSREQ);
1454 info->req = NULL;
1455 return (error);
1456 }
1457
1458 /*
1459 * Grab any Kerberos verifier, otherwise just throw it away.
1460 */
1461 verf_type = fxdr_unsigned(int, *tl++);
1462 i = fxdr_unsigned(int32_t, *tl);
1463 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1464 error = nfs_savenickauth(nmp, req->r_cred, i, req->r_key,
1465 &info->md, &info->dpos, info->mrep);
1466 if (error)
1467 goto nfsmout;
1468 } else if (i > 0) {
1469 ERROROUT(nfsm_adv(info, nfsm_rndup(i)));
1470 }
1471 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED));
1472 /* 0 == ok */
1473 if (*tl == 0) {
1474 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED));
1475 if (*tl != 0) {
1476 error = fxdr_unsigned(int, *tl);
1477
1478 /*
1479 * Does anyone even implement this? Just impose
1480 * a 1-second delay.
1481 */
1482 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1483 error == NFSERR_TRYLATER) {
1484 m_freem(info->mrep);
1485 info->mrep = NULL;
1486 error = 0;
1487
1488 tsleep((caddr_t)&lbolt, 0, "nqnfstry", 0);
1489 return (EAGAIN); /* goto tryagain */
1490 }
1491
1492 /*
1493 * If the File Handle was stale, invalidate the
1494 * lookup cache, just in case.
1495 *
1496 * To avoid namecache<->vnode deadlocks we must
1497 * release the vnode lock if we hold it.
1498 */
1499 if (error == ESTALE) {
1500 struct vnode *vp = req->r_vp;
1501 int ltype;
1502
1503 ltype = lockstatus(&vp->v_lock, curthread);
1504 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED)
1505 lockmgr(&vp->v_lock, LK_RELEASE);
1506 cache_inval_vp(vp, CINV_CHILDREN);
1507 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED)
1508 lockmgr(&vp->v_lock, ltype);
1509 }
1510 if (nmp->nm_flag & NFSMNT_NFSV3) {
1511 KKASSERT(*req->r_mrp == info->mrep);
1512 KKASSERT(*req->r_mdp == info->md);
1513 KKASSERT(*req->r_dposp == info->dpos);
1514 error |= NFSERR_RETERR;
1515 } else {
1516 m_freem(info->mrep);
1517 info->mrep = NULL;
1518 }
1519 m_freem(req->r_mreq);
1520 req->r_mreq = NULL;
1521 kfree(req, M_NFSREQ);
1522 info->req = NULL;
1523 return (error);
1524 }
1525
1526 KKASSERT(*req->r_mrp == info->mrep);
1527 KKASSERT(*req->r_mdp == info->md);
1528 KKASSERT(*req->r_dposp == info->dpos);
1529 m_freem(req->r_mreq);
1530 req->r_mreq = NULL;
1531 FREE(req, M_NFSREQ);
1532 return (0);
1533 }
1534 m_freem(info->mrep);
1535 info->mrep = NULL;
1536 error = EPROTONOSUPPORT;
1537 nfsmout:
1538 m_freem(req->r_mreq);
1539 req->r_mreq = NULL;
1540 kfree(req, M_NFSREQ);
1541 info->req = NULL;
1542 return (error);
1543 }
1544
1545 #ifndef NFS_NOSERVER
1546 /*
1547 * Generate the rpc reply header
1548 * siz arg. is used to decide if adding a cluster is worthwhile
1549 */
1550 int
1551 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp,
1552 int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp)
1553 {
1554 u_int32_t *tl;
1555 struct nfsm_info info;
1556
1557 siz += RPC_REPLYSIZ;
1558 info.mb = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL);
1559 info.mreq = info.mb;
1560 info.mreq->m_pkthdr.len = 0;
1561 /*
1562 * If this is not a cluster, try and leave leading space
1563 * for the lower level headers.
1564 */
1565 if ((max_hdr + siz) < MINCLSIZE)
1566 info.mreq->m_data += max_hdr;
1567 tl = mtod(info.mreq, u_int32_t *);
1568 info.mreq->m_len = 6 * NFSX_UNSIGNED;
1569 info.bpos = ((caddr_t)tl) + info.mreq->m_len;
1570 *tl++ = txdr_unsigned(nd->nd_retxid);
1571 *tl++ = rpc_reply;
1572 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1573 *tl++ = rpc_msgdenied;
1574 if (err & NFSERR_AUTHERR) {
1575 *tl++ = rpc_autherr;
1576 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1577 info.mreq->m_len -= NFSX_UNSIGNED;
1578 info.bpos -= NFSX_UNSIGNED;
1579 } else {
1580 *tl++ = rpc_mismatch;
1581 *tl++ = txdr_unsigned(RPC_VER2);
1582 *tl = txdr_unsigned(RPC_VER2);
1583 }
1584 } else {
1585 *tl++ = rpc_msgaccepted;
1586
1587 /*
1588 * For Kerberos authentication, we must send the nickname
1589 * verifier back, otherwise just RPCAUTH_NULL.
1590 */
1591 if (nd->nd_flag & ND_KERBFULL) {
1592 struct nfsuid *nuidp;
1593 struct timeval ktvin, ktvout;
1594
1595 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1596 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1597 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1598 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1599 &nuidp->nu_haddr, nd->nd_nam2)))
1600 break;
1601 }
1602 if (nuidp) {
1603 ktvin.tv_sec =
1604 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1605 ktvin.tv_usec =
1606 txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1607
1608 /*
1609 * Encrypt the timestamp in ecb mode using the
1610 * session key.
1611 */
1612 #ifdef NFSKERB
1613 XXX
1614 #else
1615 ktvout.tv_sec = 0;
1616 ktvout.tv_usec = 0;
1617 #endif
1618
1619 *tl++ = rpc_auth_kerb;
1620 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1621 *tl = ktvout.tv_sec;
1622 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED);
1623 *tl++ = ktvout.tv_usec;
1624 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1625 } else {
1626 *tl++ = 0;
1627 *tl++ = 0;
1628 }
1629 } else {
1630 *tl++ = 0;
1631 *tl++ = 0;
1632 }
1633 switch (err) {
1634 case EPROGUNAVAIL:
1635 *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1636 break;
1637 case EPROGMISMATCH:
1638 *tl = txdr_unsigned(RPC_PROGMISMATCH);
1639 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED);
1640 *tl++ = txdr_unsigned(2);
1641 *tl = txdr_unsigned(3);
1642 break;
1643 case EPROCUNAVAIL:
1644 *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1645 break;
1646 case EBADRPC:
1647 *tl = txdr_unsigned(RPC_GARBAGE);
1648 break;
1649 default:
1650 *tl = 0;
1651 if (err != NFSERR_RETVOID) {
1652 tl = nfsm_build(&info, NFSX_UNSIGNED);
1653 if (err)
1654 *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1655 else
1656 *tl = 0;
1657 }
1658 break;
1659 };
1660 }
1661
1662 if (mrq != NULL)
1663 *mrq = info.mreq;
1664 *mbp = info.mb;
1665 *bposp = info.bpos;
1666 if (err != 0 && err != NFSERR_RETVOID)
1667 nfsstats.srvrpc_errs++;
1668 return (0);
1669 }
1670
1671
1672 #endif /* NFS_NOSERVER */
1673
1674 /*
1675 * Nfs timer routine.
1676 *
1677 * Scan the nfsreq list and retranmit any requests that have timed out
1678 * To avoid retransmission attempts on STREAM sockets (in the future) make
1679 * sure to set the r_retry field to 0 (implies nm_retry == 0).
1680 *
1681 * Requests with attached responses, terminated requests, and
1682 * locked requests are ignored. Locked requests will be picked up
1683 * in a later timer call.
1684 */
1685 void
1686 nfs_timer(void *arg /* never used */)
1687 {
1688 struct nfsmount *nmp;
1689 struct nfsreq *req;
1690 #ifndef NFS_NOSERVER
1691 struct nfssvc_sock *slp;
1692 u_quad_t cur_usec;
1693 #endif /* NFS_NOSERVER */
1694
1695 crit_enter();
1696 TAILQ_FOREACH(nmp, &nfs_mountq, nm_entry) {
1697 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
1698 KKASSERT(nmp == req->r_nmp);
1699 if (req->r_mrep)
1700 continue;
1701 if (req->r_flags & (R_SOFTTERM | R_LOCKED))
1702 continue;
1703 req->r_flags |= R_LOCKED;
1704 if (nfs_sigintr(nmp, req, req->r_td)) {
1705 nfs_softterm(req, 1);
1706 } else {
1707 nfs_timer_req(req);
1708 }
1709 req->r_flags &= ~R_LOCKED;
1710 if (req->r_flags & R_WANTED) {
1711 req->r_flags &= ~R_WANTED;
1712 wakeup(req);
1713 }
1714 }
1715 }
1716 #ifndef NFS_NOSERVER
1717
1718 /*
1719 * Scan the write gathering queues for writes that need to be
1720 * completed now.
1721 */
1722 cur_usec = nfs_curusec();
1723 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
1724 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1725 nfsrv_wakenfsd(slp, 1);
1726 }
1727 #endif /* NFS_NOSERVER */
1728 crit_exit();
1729 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL);
1730 }
1731
1732 static
1733 void
1734 nfs_timer_req(struct nfsreq *req)
1735 {
1736 struct thread *td = &thread0; /* XXX for creds, will break if sleep */
1737 struct nfsmount *nmp = req->r_nmp;
1738 struct mbuf *m;
1739 struct socket *so;
1740 int timeo;
1741 int error;
1742
1743 /*
1744 * rtt ticks and timeout calculation. Return if the timeout
1745 * has not been reached yet, unless the packet is flagged
1746 * for an immediate send.
1747 *
1748 * The mean rtt doesn't help when we get random I/Os, we have
1749 * to multiply by fairly large numbers.
1750 */
1751 if (req->r_rtt >= 0) {
1752 /*
1753 * Calculate the timeout to test against.
1754 */
1755 req->r_rtt++;
1756 if (nmp->nm_flag & NFSMNT_DUMBTIMR) {
1757 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS;
1758 } else if (req->r_flags & R_TIMING) {
1759 timeo = NFS_SRTT(req) + NFS_SDRTT(req);
1760 } else {
1761 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS;
1762 }
1763 timeo *= multt[req->r_procnum];
1764 /* timeo is still scaled by SCALE_BITS */
1765
1766 #define NFSFS (NFS_RTT_SCALE * NFS_HZ)
1767 if (req->r_flags & R_TIMING) {
1768 static long last_time;
1769 if (nfs_showrtt && last_time != time_second) {
1770 kprintf("rpccmd %d NFS SRTT %d SDRTT %d "
1771 "timeo %d.%03d\n",
1772 proct[req->r_procnum],
1773 NFS_SRTT(req), NFS_SDRTT(req),
1774 timeo / NFSFS,
1775 timeo % NFSFS * 1000 / NFSFS);
1776 last_time = time_second;
1777 }
1778 }
1779 #undef NFSFS
1780
1781 /*
1782 * deal with nfs_timer jitter.
1783 */
1784 timeo = (timeo >> NFS_RTT_SCALE_BITS) + 1;
1785 if (timeo < 2)
1786 timeo = 2;
1787
1788 if (nmp->nm_timeouts > 0)
1789 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1790 if (timeo > NFS_MAXTIMEO)
1791 timeo = NFS_MAXTIMEO;
1792 if (req->r_rtt <= timeo) {
1793 if ((req->r_flags & R_NEEDSXMIT) == 0)
1794 return;
1795 } else if (nmp->nm_timeouts < 8) {
1796 nmp->nm_timeouts++;
1797 }
1798 }
1799
1800 /*
1801 * Check for server not responding
1802 */
1803 if ((req->r_flags & R_TPRINTFMSG) == 0 &&
1804 req->r_rexmit > nmp->nm_deadthresh) {
1805 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1806 "not responding");
1807 req->r_flags |= R_TPRINTFMSG;
1808 }
1809 if (req->r_rexmit >= req->r_retry) { /* too many */
1810 nfsstats.rpctimeouts++;
1811 nfs_softterm(req, 1);
1812 return;
1813 }
1814
1815 /*
1816 * Generally disable retransmission on reliable sockets,
1817 * unless the request is flagged for immediate send.
1818 */
1819 if (nmp->nm_sotype != SOCK_DGRAM) {
1820 if (++req->r_rexmit > NFS_MAXREXMIT)
1821 req->r_rexmit = NFS_MAXREXMIT;
1822 if ((req->r_flags & R_NEEDSXMIT) == 0)
1823 return;
1824 }
1825
1826 /*
1827 * Stop here if we do not have a socket!
1828 */
1829 if ((so = nmp->nm_so) == NULL)
1830 return;
1831
1832 /*
1833 * If there is enough space and the window allows.. resend it.
1834 *
1835 * r_rtt is left intact in case we get an answer after the
1836 * retry that was a reply to the original packet.
1837 */
1838 if (ssb_space(&so->so_snd) >= req->r_mreq->m_pkthdr.len &&
1839 (req->r_flags & (R_SENT | R_NEEDSXMIT)) &&
1840 (m = m_copym(req->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){
1841 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1842 error = so_pru_send(so, 0, m, NULL, NULL, td);
1843 else
1844 error = so_pru_send(so, 0, m, nmp->nm_nam,
1845 NULL, td);
1846 if (error) {
1847 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1848 so->so_error = 0;
1849 req->r_flags |= R_NEEDSXMIT;
1850 } else if (req->r_mrep == NULL) {
1851 /*
1852 * Iff first send, start timing
1853 * else turn timing off, backoff timer
1854 * and divide congestion window by 2.
1855 *
1856 * It is possible for the so_pru_send() to
1857 * block and for us to race a reply so we
1858 * only do this if the reply field has not
1859 * been filled in. R_LOCKED will prevent
1860 * the request from being ripped out from under
1861 * us entirely.
1862 *
1863 * Record the last resent procnum to aid us
1864 * in duplicate detection on receive.
1865 */
1866 if ((req->r_flags & R_NEEDSXMIT) == 0) {
1867 if (nfs_showrexmit)
1868 kprintf("X");
1869 if (++req->r_rexmit > NFS_MAXREXMIT)
1870 req->r_rexmit = NFS_MAXREXMIT;
1871 nmp->nm_maxasync_scaled >>= 1;
1872 if (nmp->nm_maxasync_scaled < NFS_MINASYNC_SCALED)
1873 nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED;
1874 nfsstats.rpcretries++;
1875 nmp->nm_lastreprocnum = req->r_procnum;
1876 } else {
1877 req->r_flags |= R_SENT;
1878 req->r_flags &= ~R_NEEDSXMIT;
1879 }
1880 }
1881 }
1882 }
1883
1884 /*
1885 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1886 * wait for all requests to complete. This is used by forced unmounts
1887 * to terminate any outstanding RPCs.
1888 *
1889 * Locked requests cannot be canceled but will be marked for
1890 * soft-termination.
1891 */
1892 int
1893 nfs_nmcancelreqs(struct nfsmount *nmp)
1894 {
1895 struct nfsreq *req;
1896 int i;
1897
1898 crit_enter();
1899 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
1900 if (req->r_mrep != NULL || (req->r_flags & R_SOFTTERM))
1901 continue;
1902 nfs_softterm(req, 0);
1903 }
1904 /* XXX the other two queues as well */
1905 crit_exit();
1906
1907 for (i = 0; i < 30; i++) {
1908 crit_enter();
1909 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) {
1910 if (nmp == req->r_nmp)
1911 break;
1912 }
1913 crit_exit();
1914 if (req == NULL)
1915 return (0);
1916 tsleep(&lbolt, 0, "nfscancel", 0);
1917 }
1918 return (EBUSY);
1919 }
1920
1921 /*
1922 * Soft-terminate a request, effectively marking it as failed.
1923 *
1924 * Must be called from within a critical section.
1925 */
1926 static void
1927 nfs_softterm(struct nfsreq *rep, int islocked)
1928 {
1929 rep->r_flags |= R_SOFTTERM;
1930 nfs_hardterm(rep, islocked);
1931 }
1932
1933 /*
1934 * Hard-terminate a request, typically after getting a response.
1935 *
1936 * The state machine can still decide to re-issue it later if necessary.
1937 *
1938 * Must be called from within a critical section.
1939 */
1940 static void
1941 nfs_hardterm(struct nfsreq *rep, int islocked)
1942 {
1943 struct nfsmount *nmp = rep->r_nmp;
1944
1945 /*
1946 * The nm_send count is decremented now to avoid deadlocks
1947 * when the process in soreceive() hasn't yet managed to send
1948 * its own request.
1949 */
1950 if (rep->r_flags & R_SENT) {
1951 rep->r_flags &= ~R_SENT;
1952 }
1953
1954 /*
1955 * If we locked the request or nobody else has locked the request,
1956 * and the request is async, we can move it to the reader thread's
1957 * queue now and fix up the state.
1958 *
1959 * If we locked the request or nobody else has locked the request,
1960 * we can wake up anyone blocked waiting for a response on the
1961 * request.
1962 */
1963 if (islocked || (rep->r_flags & R_LOCKED) == 0) {
1964 if ((rep->r_flags & (R_ONREQQ | R_ASYNC)) ==
1965 (R_ONREQQ | R_ASYNC)) {
1966 rep->r_flags &= ~R_ONREQQ;
1967 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain);
1968 --nmp->nm_reqqlen;
1969 TAILQ_INSERT_TAIL(&nmp->nm_reqrxq, rep, r_chain);
1970 KKASSERT(rep->r_info->state == NFSM_STATE_TRY ||
1971 rep->r_info->state == NFSM_STATE_WAITREPLY);
1972 rep->r_info->state = NFSM_STATE_PROCESSREPLY;
1973 nfssvc_iod_reader_wakeup(nmp);
1974 if (TAILQ_FIRST(&nmp->nm_bioq) &&
1975 nmp->nm_reqqlen == NFS_MAXASYNCBIO * 2 / 3) {
1976 nfssvc_iod_writer_wakeup(nmp);
1977 }
1978 }
1979 mtx_abort_ex_link(&nmp->nm_rxlock, &rep->r_link);
1980 }
1981 }
1982
1983 /*
1984 * Test for a termination condition pending on the process.
1985 * This is used for NFSMNT_INT mounts.
1986 */
1987 int
1988 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
1989 {
1990 sigset_t tmpset;
1991 struct proc *p;
1992 struct lwp *lp;
1993
1994 if (rep && (rep->r_flags & R_SOFTTERM))
1995 return (EINTR);
1996 /* Terminate all requests while attempting a forced unmount. */
1997 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1998 return (EINTR);
1999 if (!(nmp->nm_flag & NFSMNT_INT))
2000 return (0);
2001 /* td might be NULL YYY */
2002 if (td == NULL || (p = td->td_proc) == NULL)
2003 return (0);
2004
2005 lp = td->td_lwp;
2006 tmpset = lwp_sigpend(lp);
2007 SIGSETNAND(tmpset, lp->lwp_sigmask);
2008 SIGSETNAND(tmpset, p->p_sigignore);
2009 if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset))
2010 return (EINTR);
2011
2012 return (0);
2013 }
2014
2015 /*
2016 * Lock a socket against others.
2017 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
2018 * and also to avoid race conditions between the processes with nfs requests
2019 * in progress when a reconnect is necessary.
2020 */
2021 int
2022 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep)
2023 {
2024 mtx_t mtx = &nmp->nm_txlock;
2025 struct thread *td;
2026 int slptimeo;
2027 int slpflag;
2028 int error;
2029
2030 slpflag = 0;
2031 slptimeo = 0;
2032 td = rep ? rep->r_td : NULL;
2033 if (nmp->nm_flag & NFSMNT_INT)
2034 slpflag = PCATCH;
2035
2036 while ((error = mtx_lock_ex_try(mtx)) != 0) {
2037 if (nfs_sigintr(nmp, rep, td)) {
2038 error = EINTR;
2039 break;
2040 }
2041 error = mtx_lock_ex(mtx, "nfsndlck", slpflag, slptimeo);
2042 if (error == 0)
2043 break;
2044 if (slpflag == PCATCH) {
2045 slpflag = 0;
2046 slptimeo = 2 * hz;
2047 }
2048 }
2049 /* Always fail if our request has been cancelled. */
2050 if (rep && (rep->r_flags & R_SOFTTERM)) {
2051 if (error == 0)
2052 mtx_unlock(mtx);
2053 error = EINTR;
2054 }
2055 return (error);
2056 }
2057
2058 /*
2059 * Unlock the stream socket for others.
2060 */
2061 void
2062 nfs_sndunlock(struct nfsmount *nmp)
2063 {
2064 mtx_unlock(&nmp->nm_txlock);
2065 }
2066
2067 /*
2068 * Lock the receiver side of the socket.
2069 *
2070 * rep may be NULL.
2071 */
2072 static int
2073 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep)
2074 {
2075 mtx_t mtx = &nmp->nm_rxlock;
2076 int slpflag;
2077 int slptimeo;
2078 int error;
2079
2080 /*
2081 * Unconditionally check for completion in case another nfsiod
2082 * get the packet while the caller was blocked, before the caller
2083 * called us. Packet reception is handled by mainline code which
2084 * is protected by the BGL at the moment.
2085 *
2086 * We do not strictly need the second check just before the
2087 * tsleep(), but it's good defensive programming.
2088 */
2089 if (rep && rep->r_mrep != NULL)
2090 return (EALREADY);
2091
2092 if (nmp->nm_flag & NFSMNT_INT)
2093 slpflag = PCATCH;
2094 else
2095 slpflag = 0;
2096 slptimeo = 0;
2097
2098 while ((error = mtx_lock_ex_try(mtx)) != 0) {
2099 if (nfs_sigintr(nmp, rep, (rep ? rep->r_td : NULL))) {
2100 error = EINTR;
2101 break;
2102 }
2103 if (rep && rep->r_mrep != NULL) {
2104 error = EALREADY;
2105 break;
2106 }
2107
2108 /*
2109 * NOTE: can return ENOLCK, but in that case rep->r_mrep
2110 * will already be set.
2111 */
2112 if (rep) {
2113 error = mtx_lock_ex_link(mtx, &rep->r_link,
2114 "nfsrcvlk",
2115 slpflag, slptimeo);
2116 } else {
2117 error = mtx_lock_ex(mtx, "nfsrcvlk", slpflag, slptimeo);
2118 }
2119 if (error == 0)
2120 break;
2121
2122 /*
2123 * If our reply was recieved while we were sleeping,
2124 * then just return without taking the lock to avoid a
2125 * situation where a single iod could 'capture' the
2126 * recieve lock.
2127 */
2128 if (rep && rep->r_mrep != NULL) {
2129 error = EALREADY;
2130 break;
2131 }
2132 if (slpflag == PCATCH) {
2133 slpflag = 0;
2134 slptimeo = 2 * hz;
2135 }
2136 }
2137 if (error == 0) {
2138 if (rep && rep->r_mrep != NULL) {
2139 error = EALREADY;
2140 mtx_unlock(mtx);
2141 }
2142 }
2143 return (error);
2144 }
2145
2146 /*
2147 * Unlock the stream socket for others.
2148 */
2149 static void
2150 nfs_rcvunlock(struct nfsmount *nmp)
2151 {
2152 mtx_unlock(&nmp->nm_rxlock);
2153 }
2154
2155 /*
2156 * nfs_realign:
2157 *
2158 * Check for badly aligned mbuf data and realign by copying the unaligned
2159 * portion of the data into a new mbuf chain and freeing the portions
2160 * of the old chain that were replaced.
2161 *
2162 * We cannot simply realign the data within the existing mbuf chain
2163 * because the underlying buffers may contain other rpc commands and
2164 * we cannot afford to overwrite them.
2165 *
2166 * We would prefer to avoid this situation entirely. The situation does
2167 * not occur with NFS/UDP and is supposed to only occassionally occur
2168 * with TCP. Use vfs.nfs.realign_count and realign_test to check this.
2169 */
2170 static void
2171 nfs_realign(struct mbuf **pm, int hsiz)
2172 {
2173 struct mbuf *m;
2174 struct mbuf *n = NULL;
2175 int off = 0;
2176
2177 ++nfs_realign_test;
2178
2179 while ((m = *pm) != NULL) {
2180 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
2181 n = m_getl(m->m_len, MB_WAIT, MT_DATA, 0, NULL);
2182 n->m_len = 0;
2183 break;
2184 }
2185 pm = &m->m_next;
2186 }
2187
2188 /*
2189 * If n is non-NULL, loop on m copying data, then replace the
2190 * portion of the chain that had to be realigned.
2191 */
2192 if (n != NULL) {
2193 ++nfs_realign_count;
2194 while (m) {
2195 m_copyback(n, off, m->m_len, mtod(m, caddr_t));
2196 off += m->m_len;
2197 m = m->m_next;
2198 }
2199 m_freem(*pm);
2200 *pm = n;
2201 }
2202 }
2203
2204 #ifndef NFS_NOSERVER
2205
2206 /*
2207 * Parse an RPC request
2208 * - verify it
2209 * - fill in the cred struct.
2210 */
2211 int
2212 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header)
2213 {
2214 int len, i;
2215 u_int32_t *tl;
2216 struct uio uio;
2217 struct iovec iov;
2218 caddr_t cp;
2219 u_int32_t nfsvers, auth_type;
2220 uid_t nickuid;
2221 int error = 0, ticklen;
2222 struct nfsuid *nuidp;
2223 struct timeval tvin, tvout;
2224 struct nfsm_info info;
2225 #if 0 /* until encrypted keys are implemented */
2226 NFSKERBKEYSCHED_T keys; /* stores key schedule */
2227 #endif
2228
2229 info.mrep = nd->nd_mrep;
2230 info.md = nd->nd_md;
2231 info.dpos = nd->nd_dpos;
2232
2233 if (has_header) {
2234 NULLOUT(tl = nfsm_dissect(&info, 10 * NFSX_UNSIGNED));
2235 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
2236 if (*tl++ != rpc_call) {
2237 m_freem(info.mrep);
2238 return (EBADRPC);
2239 }
2240 } else {
2241 NULLOUT(tl = nfsm_dissect(&info, 8 * NFSX_UNSIGNED));
2242 }
2243 nd->nd_repstat = 0;
2244 nd->nd_flag = 0;
2245 if (*tl++ != rpc_vers) {
2246 nd->nd_repstat = ERPCMISMATCH;
2247 nd->nd_procnum = NFSPROC_NOOP;
2248 return (0);
2249 }
2250 if (*tl != nfs_prog) {
2251 nd->nd_repstat = EPROGUNAVAIL;
2252 nd->nd_procnum = NFSPROC_NOOP;
2253 return (0);
2254 }
2255 tl++;
2256 nfsvers = fxdr_unsigned(u_int32_t, *tl++);
2257 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) {
2258 nd->nd_repstat = EPROGMISMATCH;
2259 nd->nd_procnum = NFSPROC_NOOP;
2260 return (0);
2261 }
2262 if (nfsvers == NFS_VER3)
2263 nd->nd_flag = ND_NFSV3;
2264 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
2265 if (nd->nd_procnum == NFSPROC_NULL)
2266 return (0);
2267 if (nd->nd_procnum >= NFS_NPROCS ||
2268 (nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
2269 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
2270 nd->nd_repstat = EPROCUNAVAIL;
2271 nd->nd_procnum = NFSPROC_NOOP;
2272 return (0);
2273 }
2274 if ((nd->nd_flag & ND_NFSV3) == 0)
2275 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
2276 auth_type = *tl++;
2277 len = fxdr_unsigned(int, *tl++);
2278 if (len < 0 || len > RPCAUTH_MAXSIZ) {
2279 m_freem(info.mrep);
2280 return (EBADRPC);
2281 }
2282
2283 nd->nd_flag &= ~ND_KERBAUTH;
2284 /*
2285 * Handle auth_unix or auth_kerb.
2286 */
2287 if (auth_type == rpc_auth_unix) {
2288 len = fxdr_unsigned(int, *++tl);
2289 if (len < 0 || len > NFS_MAXNAMLEN) {
2290 m_freem(info.mrep);
2291 return (EBADRPC);
2292 }
2293 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
2294 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
2295 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
2296 nd->nd_cr.cr_ref = 1;
2297 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
2298 nd->nd_cr.cr_ruid = nd->nd_cr.cr_svuid = nd->nd_cr.cr_uid;
2299 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
2300 nd->nd_cr.cr_rgid = nd->nd_cr.cr_svgid = nd->nd_cr.cr_gid;
2301 len = fxdr_unsigned(int, *tl);
2302 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
2303 m_freem(info.mrep);
2304 return (EBADRPC);
2305 }
2306 NULLOUT(tl = nfsm_dissect(&info, (len + 2) * NFSX_UNSIGNED));
2307 for (i = 1; i <= len; i++)
2308 if (i < NGROUPS)
2309 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
2310 else
2311 tl++;
2312 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
2313 if (nd->nd_cr.cr_ngroups > 1)
2314 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
2315 len = fxdr_unsigned(int, *++tl);
2316 if (len < 0 || len > RPCAUTH_MAXSIZ) {
2317 m_freem(info.mrep);
2318 return (EBADRPC);
2319 }
2320 if (len > 0) {
2321 ERROROUT(nfsm_adv(&info, nfsm_rndup(len)));
2322 }
2323 } else if (auth_type == rpc_auth_kerb) {
2324 switch (fxdr_unsigned(int, *tl++)) {
2325 case RPCAKN_FULLNAME:
2326 ticklen = fxdr_unsigned(int, *tl);
2327 *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
2328 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
2329 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
2330 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
2331 m_freem(info.mrep);
2332 return (EBADRPC);
2333 }
2334 uio.uio_offset = 0;
2335 uio.uio_iov = &iov;
2336 uio.uio_iovcnt = 1;
2337 uio.uio_segflg = UIO_SYSSPACE;
2338 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
2339 iov.iov_len = RPCAUTH_MAXSIZ - 4;
2340 ERROROUT(nfsm_mtouio(&info, &uio, uio.uio_resid));
2341 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
2342 if (*tl++ != rpc_auth_kerb ||
2343 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
2344 kprintf("Bad kerb verifier\n");
2345 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2346 nd->nd_procnum = NFSPROC_NOOP;
2347 return (0);
2348 }
2349 NULLOUT(cp = nfsm_dissect(&info, 4 * NFSX_UNSIGNED));
2350 tl = (u_int32_t *)cp;
2351 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
2352 kprintf("Not fullname kerb verifier\n");
2353 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2354 nd->nd_procnum = NFSPROC_NOOP;
2355 return (0);
2356 }
2357 cp += NFSX_UNSIGNED;
2358 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
2359 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
2360 nd->nd_flag |= ND_KERBFULL;
2361 nfsd->nfsd_flag |= NFSD_NEEDAUTH;
2362 break;
2363 case RPCAKN_NICKNAME:
2364 if (len != 2 * NFSX_UNSIGNED) {
2365 kprintf("Kerb nickname short\n");
2366 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
2367 nd->nd_procnum = NFSPROC_NOOP;
2368 return (0);
2369 }
2370 nickuid = fxdr_unsigned(uid_t, *tl);
2371 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED));
2372 if (*tl++ != rpc_auth_kerb ||
2373 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
2374 kprintf("Kerb nick verifier bad\n");
2375 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
2376 nd->nd_procnum = NFSPROC_NOOP;
2377 return (0);
2378 }
2379 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED));
2380 tvin.tv_sec = *tl++;
2381 tvin.tv_usec = *tl;
2382
2383 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
2384 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
2385 if (nuidp->nu_cr.cr_uid == nickuid &&
2386 (!nd->nd_nam2 ||
2387 netaddr_match(NU_NETFAM(nuidp),
2388 &nuidp->nu_haddr, nd->nd_nam2)))
2389 break;
2390 }
2391 if (!nuidp) {
2392 nd->nd_repstat =
2393 (NFSERR_AUTHERR|AUTH_REJECTCRED);
2394 nd->nd_procnum = NFSPROC_NOOP;
2395 return (0);
2396 }
2397
2398 /*
2399 * Now, decrypt the timestamp using the session key
2400 * and validate it.
2401 */
2402 #ifdef NFSKERB
2403 XXX
2404 #else
2405 tvout.tv_sec = 0;
2406 tvout.tv_usec = 0;
2407 #endif
2408
2409 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
2410 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
2411 if (nuidp->nu_expire < time_second ||
2412 nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
2413 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
2414 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
2415 nuidp->nu_expire = 0;
2416 nd->nd_repstat =
2417 (NFSERR_AUTHERR|AUTH_REJECTVERF);
2418 nd->nd_procnum = NFSPROC_NOOP;
2419 return (0);
2420 }
2421 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
2422 nd->nd_flag |= ND_KERBNICK;
2423 };
2424 } else {
2425 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
2426 nd->nd_procnum = NFSPROC_NOOP;
2427 return (0);
2428 }
2429
2430 nd->nd_md = info.md;
2431 nd->nd_dpos = info.dpos;
2432 return (0);
2433 nfsmout:
2434 return (error);
2435 }
2436
2437 #endif
2438
2439 /*
2440 * Send a message to the originating process's terminal. The thread and/or
2441 * process may be NULL. YYY the thread should not be NULL but there may
2442 * still be some uio_td's that are still being passed as NULL through to
2443 * nfsm_request().
2444 */
2445 static int
2446 nfs_msg(struct thread *td, char *server, char *msg)
2447 {
2448 tpr_t tpr;
2449
2450 if (td && td->td_proc)
2451 tpr = tprintf_open(td->td_proc);
2452 else
2453 tpr = NULL;
2454 tprintf(tpr, "nfs server %s: %s\n", server, msg);
2455 tprintf_close(tpr);
2456 return (0);
2457 }
2458
2459 #ifndef NFS_NOSERVER
2460 /*
2461 * Socket upcall routine for the nfsd sockets.
2462 * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2463 * Essentially do as much as possible non-blocking, else punt and it will
2464 * be called with MB_WAIT from an nfsd.
2465 */
2466 void
2467 nfsrv_rcv(struct socket *so, void *arg, int waitflag)
2468 {
2469 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2470 struct mbuf *m;
2471 struct sockaddr *nam;
2472 struct sockbuf sio;
2473 int flags, error;
2474 int nparallel_wakeup = 0;
2475
2476 if ((slp->ns_flag & SLP_VALID) == 0)
2477 return;
2478
2479 /*
2480 * Do not allow an infinite number of completed RPC records to build
2481 * up before we stop reading data from the socket. Otherwise we could
2482 * end up holding onto an unreasonable number of mbufs for requests
2483 * waiting for service.
2484 *
2485 * This should give pretty good feedback to the TCP
2486 * layer and prevents a memory crunch for other protocols.
2487 *
2488 * Note that the same service socket can be dispatched to several
2489 * nfs servers simultaniously.
2490 *
2491 * the tcp protocol callback calls us with MB_DONTWAIT.
2492 * nfsd calls us with MB_WAIT (typically).
2493 */
2494 if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) {
2495 slp->ns_flag |= SLP_NEEDQ;
2496 goto dorecs;
2497 }
2498
2499 /*
2500 * Handle protocol specifics to parse an RPC request. We always
2501 * pull from the socket using non-blocking I/O.
2502 */
2503 if (so->so_type == SOCK_STREAM) {
2504 /*
2505 * The data has to be read in an orderly fashion from a TCP
2506 * stream, unlike a UDP socket. It is possible for soreceive
2507 * and/or nfsrv_getstream() to block, so make sure only one
2508 * entity is messing around with the TCP stream at any given
2509 * moment. The receive sockbuf's lock in soreceive is not
2510 * sufficient.
2511 *
2512 * Note that this procedure can be called from any number of
2513 * NFS severs *OR* can be upcalled directly from a TCP
2514 * protocol thread.
2515 */
2516 if (slp->ns_flag & SLP_GETSTREAM) {
2517 slp->ns_flag |= SLP_NEEDQ;
2518 goto dorecs;
2519 }
2520 slp->ns_flag |= SLP_GETSTREAM;
2521
2522 /*
2523 * Do soreceive(). Pull out as much data as possible without
2524 * blocking.
2525 */
2526 sbinit(&sio, 1000000000);
2527 flags = MSG_DONTWAIT;
2528 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags);
2529 if (error || sio.sb_mb == NULL) {
2530 if (error == EWOULDBLOCK)
2531 slp->ns_flag |= SLP_NEEDQ;
2532 else
2533 slp->ns_flag |= SLP_DISCONN;
2534 slp->ns_flag &= ~SLP_GETSTREAM;
2535 goto dorecs;
2536 }
2537 m = sio.sb_mb;
2538 if (slp->ns_rawend) {
2539 slp->ns_rawend->m_next = m;
2540 slp->ns_cc += sio.sb_cc;
2541 } else {
2542 slp->ns_raw = m;
2543 slp->ns_cc = sio.sb_cc;
2544 }
2545 while (m->m_next)
2546 m = m->m_next;
2547 slp->ns_rawend = m;
2548
2549 /*
2550 * Now try and parse as many record(s) as we can out of the
2551 * raw stream data.
2552 */
2553 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup);
2554 if (error) {
2555 if (error == EPERM)
2556 slp->ns_flag |= SLP_DISCONN;
2557 else
2558 slp->ns_flag |= SLP_NEEDQ;
2559 }
2560 slp->ns_flag &= ~SLP_GETSTREAM;
2561 } else {
2562 /*
2563 * For UDP soreceive typically pulls just one packet, loop
2564 * to get the whole batch.
2565 */
2566 do {
2567 sbinit(&sio, 1000000000);
2568 flags = MSG_DONTWAIT;
2569 error = so_pru_soreceive(so, &nam, NULL, &sio,
2570 NULL, &flags);
2571 if (sio.sb_mb) {
2572 struct nfsrv_rec *rec;
2573 int mf = (waitflag & MB_DONTWAIT) ?
2574 M_NOWAIT : M_WAITOK;
2575 rec = kmalloc(sizeof(struct nfsrv_rec),
2576 M_NFSRVDESC, mf);
2577 if (!rec) {
2578 if (nam)
2579 FREE(nam, M_SONAME);
2580 m_freem(sio.sb_mb);
2581 continue;
2582 }
2583 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED);
2584 rec->nr_address = nam;
2585 rec->nr_packet = sio.sb_mb;
2586 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2587 ++slp->ns_numrec;
2588 ++nparallel_wakeup;
2589 }
2590 if (error) {
2591 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2592 && error != EWOULDBLOCK) {
2593 slp->ns_flag |= SLP_DISCONN;
2594 goto dorecs;
2595 }
2596 }
2597 } while (sio.sb_mb);
2598 }
2599
2600 /*
2601 * If we were upcalled from the tcp protocol layer and we have
2602 * fully parsed records ready to go, or there is new data pending,
2603 * or something went wrong, try to wake up an nfsd thread to deal
2604 * with it.
2605 */
2606 dorecs:
2607 if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0
2608 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) {
2609 nfsrv_wakenfsd(slp, nparallel_wakeup);
2610 }
2611 }
2612
2613 /*
2614 * Try and extract an RPC request from the mbuf data list received on a
2615 * stream socket. The "waitflag" argument indicates whether or not it
2616 * can sleep.
2617 */
2618 static int
2619 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp)
2620 {
2621 struct mbuf *m, **mpp;
2622 char *cp1, *cp2;
2623 int len;
2624 struct mbuf *om, *m2, *recm;
2625 u_int32_t recmark;
2626
2627 for (;;) {
2628 if (slp->ns_reclen == 0) {
2629 if (slp->ns_cc < NFSX_UNSIGNED)
2630 return (0);
2631 m = slp->ns_raw;
2632 if (m->m_len >= NFSX_UNSIGNED) {
2633 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2634 m->m_data += NFSX_UNSIGNED;
2635 m->m_len -= NFSX_UNSIGNED;
2636 } else {
2637 cp1 = (caddr_t)&recmark;
2638 cp2 = mtod(m, caddr_t);
2639 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2640 while (m->m_len == 0) {
2641 m = m->m_next;
2642 cp2 = mtod(m, caddr_t);
2643 }
2644 *cp1++ = *cp2++;
2645 m->m_data++;
2646 m->m_len--;
2647 }
2648 }
2649 slp->ns_cc -= NFSX_UNSIGNED;
2650 recmark = ntohl(recmark);
2651 slp->ns_reclen = recmark & ~0x80000000;
2652 if (recmark & 0x80000000)
2653 slp->ns_flag |= SLP_LASTFRAG;
2654 else
2655 slp->ns_flag &= ~SLP_LASTFRAG;
2656 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) {
2657 log(LOG_ERR, "%s (%d) from nfs client\n",
2658 "impossible packet length",
2659 slp->ns_reclen);
2660 return (EPERM);
2661 }
2662 }
2663
2664 /*
2665 * Now get the record part.
2666 *
2667 * Note that slp->ns_reclen may be 0. Linux sometimes
2668 * generates 0-length RPCs
2669 */
2670 recm = NULL;
2671 if (slp->ns_cc == slp->ns_reclen) {
2672 recm = slp->ns_raw;
2673 slp->ns_raw = slp->ns_rawend = NULL;
2674 slp->ns_cc = slp->ns_reclen = 0;
2675 } else if (slp->ns_cc > slp->ns_reclen) {
2676 len = 0;
2677 m = slp->ns_raw;
2678 om = NULL;
2679
2680 while (len < slp->ns_reclen) {
2681 if ((len + m->m_len) > slp->ns_reclen) {
2682 m2 = m_copym(m, 0, slp->ns_reclen - len,
2683 waitflag);
2684 if (m2) {
2685 if (om) {
2686 om->m_next = m2;
2687 recm = slp->ns_raw;
2688 } else
2689 recm = m2;
2690 m->m_data += slp->ns_reclen - len;
2691 m->m_len -= slp->ns_reclen - len;
2692 len = slp->ns_reclen;
2693 } else {
2694 return (EWOULDBLOCK);
2695 }
2696 } else if ((len + m->m_len) == slp->ns_reclen) {
2697 om = m;
2698 len += m->m_len;
2699 m = m->m_next;
2700 recm = slp->ns_raw;
2701 om->m_next = NULL;
2702 } else {
2703 om = m;
2704 len += m->m_len;
2705 m = m->m_next;
2706 }
2707 }
2708 slp->ns_raw = m;
2709 slp->ns_cc -= len;
2710 slp->ns_reclen = 0;
2711 } else {
2712 return (0);
2713 }
2714
2715 /*
2716 * Accumulate the fragments into a record.
2717 */
2718 mpp = &slp->ns_frag;
2719 while (*mpp)
2720 mpp = &((*mpp)->m_next);
2721 *mpp = recm;
2722 if (slp->ns_flag & SLP_LASTFRAG) {
2723 struct nfsrv_rec *rec;
2724 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK;
2725 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf);
2726 if (!rec) {
2727 m_freem(slp->ns_frag);
2728 } else {
2729 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2730 rec->nr_address = NULL;
2731 rec->nr_packet = slp->ns_frag;
2732 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2733 ++slp->ns_numrec;
2734 ++*countp;
2735 }
2736 slp->ns_frag = NULL;
2737 }
2738 }
2739 }
2740
2741 /*
2742 * Parse an RPC header.
2743 */
2744 int
2745 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd,
2746 struct nfsrv_descript **ndp)
2747 {
2748 struct nfsrv_rec *rec;
2749 struct mbuf *m;
2750 struct sockaddr *nam;
2751 struct nfsrv_descript *nd;
2752 int error;
2753
2754 *ndp = NULL;
2755 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2756 return (ENOBUFS);
2757 rec = STAILQ_FIRST(&slp->ns_rec);
2758 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2759 KKASSERT(slp->ns_numrec > 0);
2760 --slp->ns_numrec;
2761 nam = rec->nr_address;
2762 m = rec->nr_packet;
2763 kfree(rec, M_NFSRVDESC);
2764 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2765 M_NFSRVDESC, M_WAITOK);
2766 nd->nd_md = nd->nd_mrep = m;
2767 nd->nd_nam2 = nam;
2768 nd->nd_dpos = mtod(m, caddr_t);
2769 error = nfs_getreq(nd, nfsd, TRUE);
2770 if (error) {
2771 if (nam) {
2772 FREE(nam, M_SONAME);
2773 }
2774 kfree((caddr_t)nd, M_NFSRVDESC);
2775 return (error);
2776 }
2777 *ndp = nd;
2778 nfsd->nfsd_nd = nd;
2779 return (0);
2780 }
2781
2782 /*
2783 * Try to assign service sockets to nfsd threads based on the number
2784 * of new rpc requests that have been queued on the service socket.
2785 *
2786 * If no nfsd's are available or additonal requests are pending, set the
2787 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for
2788 * the work in the nfssvc_sock list when it is finished processing its
2789 * current work. This flag is only cleared when an nfsd can not find
2790 * any new work to perform.
2791 */
2792 void
2793 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel)
2794 {
2795 struct nfsd *nd;
2796
2797 if ((slp->ns_flag & SLP_VALID) == 0)
2798 return;
2799 if (nparallel <= 1)
2800 nparallel = 1;
2801 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) {
2802 if (nd->nfsd_flag & NFSD_WAITING) {
2803 nd->nfsd_flag &= ~NFSD_WAITING;
2804 if (nd->nfsd_slp)
2805 panic("nfsd wakeup");
2806 slp->ns_sref++;
2807 nd->nfsd_slp = slp;
2808 wakeup((caddr_t)nd);
2809 if (--nparallel == 0)
2810 break;
2811 }
2812 }
2813 if (nparallel) {
2814 slp->ns_flag |= SLP_DOREC;
2815 nfsd_head_flag |= NFSD_CHECKSLP;
2816 }
2817 }
2818 #endif /* NFS_NOSERVER */
DragonFly BSD