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Updated the list of USB device IDs for uvisor(4) and needed routines.
[dragonfly.git] / sys / vfs / nfs / nfs_socket.c
blobf0b09ae55181edc8907b23e331835c6ebc61d16f
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/signal2.h>
65
66 #include <netinet/in.h>
67 #include <netinet/tcp.h>
68 #include <sys/thread2.h>
69
70 #include "rpcv2.h"
71 #include "nfsproto.h"
72 #include "nfs.h"
73 #include "xdr_subs.h"
74 #include "nfsm_subs.h"
75 #include "nfsmount.h"
76 #include "nfsnode.h"
77 #include "nfsrtt.h"
78
79 #define TRUE 1
80 #define FALSE 0
81
82 /*
83 * Estimate rto for an nfs rpc sent via. an unreliable datagram.
84 * Use the mean and mean deviation of rtt for the appropriate type of rpc
85 * for the frequent rpcs and a default for the others.
86 * The justification for doing "other" this way is that these rpcs
87 * happen so infrequently that timer est. would probably be stale.
88 * Also, since many of these rpcs are
89 * non-idempotent, a conservative timeout is desired.
90 * getattr, lookup - A+2D
91 * read, write - A+4D
92 * other - nm_timeo
93 */
94 #define NFS_RTO(n, t) \
95 ((t) == 0 ? (n)->nm_timeo : \
96 ((t) < 3 ? \
97 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
98 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
99 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
100 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
101 /*
102 * External data, mostly RPC constants in XDR form
103 */
104 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers,
105 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr,
106 rpc_auth_kerb;
107 extern u_int32_t nfs_prog;
108 extern struct nfsstats nfsstats;
109 extern int nfsv3_procid[NFS_NPROCS];
110 extern int nfs_ticks;
111
112 /*
113 * Defines which timer to use for the procnum.
114 * 0 - default
115 * 1 - getattr
116 * 2 - lookup
117 * 3 - read
118 * 4 - write
119 */
120 static int proct[NFS_NPROCS] = {
121 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
122 0, 0, 0,
123 };
124
125 static int nfs_realign_test;
126 static int nfs_realign_count;
127 static int nfs_bufpackets = 4;
128 static int nfs_timer_raced;
129
130 SYSCTL_DECL(_vfs_nfs);
131
132 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
133 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
134 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
135
136
137 /*
138 * There is a congestion window for outstanding rpcs maintained per mount
139 * point. The cwnd size is adjusted in roughly the way that:
140 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
141 * SIGCOMM '88". ACM, August 1988.
142 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
143 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
144 * of rpcs is in progress.
145 * (The sent count and cwnd are scaled for integer arith.)
146 * Variants of "slow start" were tried and were found to be too much of a
147 * performance hit (ave. rtt 3 times larger),
148 * I suspect due to the large rtt that nfs rpcs have.
149 */
150 #define NFS_CWNDSCALE 256
151 #define NFS_MAXCWND (NFS_CWNDSCALE * 32)
152 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
153 int nfsrtton = 0;
154 struct nfsrtt nfsrtt;
155 struct callout nfs_timer_handle;
156
157 static int nfs_msg (struct thread *,char *,char *);
158 static int nfs_rcvlock (struct nfsreq *);
159 static void nfs_rcvunlock (struct nfsreq *);
160 static void nfs_realign (struct mbuf **pm, int hsiz);
161 static int nfs_receive (struct nfsreq *rep, struct sockaddr **aname,
162 struct mbuf **mp);
163 static void nfs_softterm (struct nfsreq *rep);
164 static int nfs_reconnect (struct nfsreq *rep);
165 #ifndef NFS_NOSERVER
166 static int nfsrv_getstream (struct nfssvc_sock *, int, int *);
167
168 int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
169 struct nfssvc_sock *slp,
170 struct thread *td,
171 struct mbuf **mreqp) = {
172 nfsrv_null,
173 nfsrv_getattr,
174 nfsrv_setattr,
175 nfsrv_lookup,
176 nfsrv3_access,
177 nfsrv_readlink,
178 nfsrv_read,
179 nfsrv_write,
180 nfsrv_create,
181 nfsrv_mkdir,
182 nfsrv_symlink,
183 nfsrv_mknod,
184 nfsrv_remove,
185 nfsrv_rmdir,
186 nfsrv_rename,
187 nfsrv_link,
188 nfsrv_readdir,
189 nfsrv_readdirplus,
190 nfsrv_statfs,
191 nfsrv_fsinfo,
192 nfsrv_pathconf,
193 nfsrv_commit,
194 nfsrv_noop,
195 nfsrv_noop,
196 nfsrv_noop,
197 nfsrv_noop
198 };
199 #endif /* NFS_NOSERVER */
200
201 /*
202 * Initialize sockets and congestion for a new NFS connection.
203 * We do not free the sockaddr if error.
204 */
205 int
206 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
207 {
208 struct socket *so;
209 int error, rcvreserve, sndreserve;
210 int pktscale;
211 struct sockaddr *saddr;
212 struct sockaddr_in *sin;
213 struct thread *td = &thread0; /* only used for socreate and sobind */
214
215 nmp->nm_so = (struct socket *)0;
216 saddr = nmp->nm_nam;
217 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
218 nmp->nm_soproto, td);
219 if (error)
220 goto bad;
221 so = nmp->nm_so;
222 nmp->nm_soflags = so->so_proto->pr_flags;
223
224 /*
225 * Some servers require that the client port be a reserved port number.
226 */
227 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
228 struct sockopt sopt;
229 int ip;
230 struct sockaddr_in ssin;
231
232 bzero(&sopt, sizeof sopt);
233 ip = IP_PORTRANGE_LOW;
234 sopt.sopt_level = IPPROTO_IP;
235 sopt.sopt_name = IP_PORTRANGE;
236 sopt.sopt_val = (void *)&ip;
237 sopt.sopt_valsize = sizeof(ip);
238 sopt.sopt_td = NULL;
239 error = sosetopt(so, &sopt);
240 if (error)
241 goto bad;
242 bzero(&ssin, sizeof ssin);
243 sin = &ssin;
244 sin->sin_len = sizeof (struct sockaddr_in);
245 sin->sin_family = AF_INET;
246 sin->sin_addr.s_addr = INADDR_ANY;
247 sin->sin_port = htons(0);
248 error = sobind(so, (struct sockaddr *)sin, td);
249 if (error)
250 goto bad;
251 bzero(&sopt, sizeof sopt);
252 ip = IP_PORTRANGE_DEFAULT;
253 sopt.sopt_level = IPPROTO_IP;
254 sopt.sopt_name = IP_PORTRANGE;
255 sopt.sopt_val = (void *)&ip;
256 sopt.sopt_valsize = sizeof(ip);
257 sopt.sopt_td = NULL;
258 error = sosetopt(so, &sopt);
259 if (error)
260 goto bad;
261 }
262
263 /*
264 * Protocols that do not require connections may be optionally left
265 * unconnected for servers that reply from a port other than NFS_PORT.
266 */
267 if (nmp->nm_flag & NFSMNT_NOCONN) {
268 if (nmp->nm_soflags & PR_CONNREQUIRED) {
269 error = ENOTCONN;
270 goto bad;
271 }
272 } else {
273 error = soconnect(so, nmp->nm_nam, td);
274 if (error)
275 goto bad;
276
277 /*
278 * Wait for the connection to complete. Cribbed from the
279 * connect system call but with the wait timing out so
280 * that interruptible mounts don't hang here for a long time.
281 */
282 crit_enter();
283 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
284 (void) tsleep((caddr_t)&so->so_timeo, 0,
285 "nfscon", 2 * hz);
286 if ((so->so_state & SS_ISCONNECTING) &&
287 so->so_error == 0 && rep &&
288 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
289 so->so_state &= ~SS_ISCONNECTING;
290 crit_exit();
291 goto bad;
292 }
293 }
294 if (so->so_error) {
295 error = so->so_error;
296 so->so_error = 0;
297 crit_exit();
298 goto bad;
299 }
300 crit_exit();
301 }
302 so->so_rcv.ssb_timeo = (5 * hz);
303 so->so_snd.ssb_timeo = (5 * hz);
304
305 /*
306 * Get buffer reservation size from sysctl, but impose reasonable
307 * limits.
308 */
309 pktscale = nfs_bufpackets;
310 if (pktscale < 2)
311 pktscale = 2;
312 if (pktscale > 64)
313 pktscale = 64;
314
315 if (nmp->nm_sotype == SOCK_DGRAM) {
316 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
317 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
318 NFS_MAXPKTHDR) * pktscale;
319 } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
320 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
321 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
322 NFS_MAXPKTHDR) * pktscale;
323 } else {
324 if (nmp->nm_sotype != SOCK_STREAM)
325 panic("nfscon sotype");
326 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
327 struct sockopt sopt;
328 int val;
329
330 bzero(&sopt, sizeof sopt);
331 sopt.sopt_level = SOL_SOCKET;
332 sopt.sopt_name = SO_KEEPALIVE;
333 sopt.sopt_val = &val;
334 sopt.sopt_valsize = sizeof val;
335 val = 1;
336 sosetopt(so, &sopt);
337 }
338 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
339 struct sockopt sopt;
340 int val;
341
342 bzero(&sopt, sizeof sopt);
343 sopt.sopt_level = IPPROTO_TCP;
344 sopt.sopt_name = TCP_NODELAY;
345 sopt.sopt_val = &val;
346 sopt.sopt_valsize = sizeof val;
347 val = 1;
348 sosetopt(so, &sopt);
349 }
350 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
351 sizeof (u_int32_t)) * pktscale;
352 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
353 sizeof (u_int32_t)) * pktscale;
354 }
355 error = soreserve(so, sndreserve, rcvreserve,
356 &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
357 if (error)
358 goto bad;
359 so->so_rcv.ssb_flags |= SSB_NOINTR;
360 so->so_snd.ssb_flags |= SSB_NOINTR;
361
362 /* Initialize other non-zero congestion variables */
363 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] =
364 nmp->nm_srtt[3] = (NFS_TIMEO << 3);
365 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
366 nmp->nm_sdrtt[3] = 0;
367 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */
368 nmp->nm_sent = 0;
369 nmp->nm_timeouts = 0;
370 return (0);
371
372 bad:
373 nfs_disconnect(nmp);
374 return (error);
375 }
376
377 /*
378 * Reconnect routine:
379 * Called when a connection is broken on a reliable protocol.
380 * - clean up the old socket
381 * - nfs_connect() again
382 * - set R_MUSTRESEND for all outstanding requests on mount point
383 * If this fails the mount point is DEAD!
384 * nb: Must be called with the nfs_sndlock() set on the mount point.
385 */
386 static int
387 nfs_reconnect(struct nfsreq *rep)
388 {
389 struct nfsreq *rp;
390 struct nfsmount *nmp = rep->r_nmp;
391 int error;
392
393 nfs_disconnect(nmp);
394 while ((error = nfs_connect(nmp, rep)) != 0) {
395 if (error == EINTR || error == ERESTART)
396 return (EINTR);
397 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
398 }
399
400 /*
401 * Loop through outstanding request list and fix up all requests
402 * on old socket.
403 */
404 crit_enter();
405 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) {
406 if (rp->r_nmp == nmp)
407 rp->r_flags |= R_MUSTRESEND;
408 }
409 crit_exit();
410 return (0);
411 }
412
413 /*
414 * NFS disconnect. Clean up and unlink.
415 */
416 void
417 nfs_disconnect(struct nfsmount *nmp)
418 {
419 struct socket *so;
420
421 if (nmp->nm_so) {
422 so = nmp->nm_so;
423 nmp->nm_so = (struct socket *)0;
424 soshutdown(so, SHUT_RDWR);
425 soclose(so, FNONBLOCK);
426 }
427 }
428
429 void
430 nfs_safedisconnect(struct nfsmount *nmp)
431 {
432 struct nfsreq dummyreq;
433
434 bzero(&dummyreq, sizeof(dummyreq));
435 dummyreq.r_nmp = nmp;
436 dummyreq.r_td = NULL;
437 nfs_rcvlock(&dummyreq);
438 nfs_disconnect(nmp);
439 nfs_rcvunlock(&dummyreq);
440 }
441
442 /*
443 * This is the nfs send routine. For connection based socket types, it
444 * must be called with an nfs_sndlock() on the socket.
445 * "rep == NULL" indicates that it has been called from a server.
446 * For the client side:
447 * - return EINTR if the RPC is terminated, 0 otherwise
448 * - set R_MUSTRESEND if the send fails for any reason
449 * - do any cleanup required by recoverable socket errors (?)
450 * For the server side:
451 * - return EINTR or ERESTART if interrupted by a signal
452 * - return EPIPE if a connection is lost for connection based sockets (TCP...)
453 * - do any cleanup required by recoverable socket errors (?)
454 */
455 int
456 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top,
457 struct nfsreq *rep)
458 {
459 struct sockaddr *sendnam;
460 int error, soflags, flags;
461
462 if (rep) {
463 if (rep->r_flags & R_SOFTTERM) {
464 m_freem(top);
465 return (EINTR);
466 }
467 if ((so = rep->r_nmp->nm_so) == NULL) {
468 rep->r_flags |= R_MUSTRESEND;
469 m_freem(top);
470 return (0);
471 }
472 rep->r_flags &= ~R_MUSTRESEND;
473 soflags = rep->r_nmp->nm_soflags;
474 } else
475 soflags = so->so_proto->pr_flags;
476 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED))
477 sendnam = (struct sockaddr *)0;
478 else
479 sendnam = nam;
480 if (so->so_type == SOCK_SEQPACKET)
481 flags = MSG_EOR;
482 else
483 flags = 0;
484
485 error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags,
486 curthread /*XXX*/);
487 /*
488 * ENOBUFS for dgram sockets is transient and non fatal.
489 * No need to log, and no need to break a soft mount.
490 */
491 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) {
492 error = 0;
493 if (rep) /* do backoff retransmit on client */
494 rep->r_flags |= R_MUSTRESEND;
495 }
496
497 if (error) {
498 if (rep) {
499 log(LOG_INFO, "nfs send error %d for server %s\n",error,
500 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
501 /*
502 * Deal with errors for the client side.
503 */
504 if (rep->r_flags & R_SOFTTERM)
505 error = EINTR;
506 else
507 rep->r_flags |= R_MUSTRESEND;
508 } else
509 log(LOG_INFO, "nfsd send error %d\n", error);
510
511 /*
512 * Handle any recoverable (soft) socket errors here. (?)
513 */
514 if (error != EINTR && error != ERESTART &&
515 error != EWOULDBLOCK && error != EPIPE)
516 error = 0;
517 }
518 return (error);
519 }
520
521 /*
522 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all
523 * done by soreceive(), but for SOCK_STREAM we must deal with the Record
524 * Mark and consolidate the data into a new mbuf list.
525 * nb: Sometimes TCP passes the data up to soreceive() in long lists of
526 * small mbufs.
527 * For SOCK_STREAM we must be very careful to read an entire record once
528 * we have read any of it, even if the system call has been interrupted.
529 */
530 static int
531 nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp)
532 {
533 struct socket *so;
534 struct sockbuf sio;
535 struct uio auio;
536 struct iovec aio;
537 struct mbuf *m;
538 struct mbuf *control;
539 u_int32_t len;
540 struct sockaddr **getnam;
541 int error, sotype, rcvflg;
542 struct thread *td = curthread; /* XXX */
543
544 /*
545 * Set up arguments for soreceive()
546 */
547 *mp = NULL;
548 *aname = NULL;
549 sotype = rep->r_nmp->nm_sotype;
550
551 /*
552 * For reliable protocols, lock against other senders/receivers
553 * in case a reconnect is necessary.
554 * For SOCK_STREAM, first get the Record Mark to find out how much
555 * more there is to get.
556 * We must lock the socket against other receivers
557 * until we have an entire rpc request/reply.
558 */
559 if (sotype != SOCK_DGRAM) {
560 error = nfs_sndlock(rep);
561 if (error)
562 return (error);
563 tryagain:
564 /*
565 * Check for fatal errors and resending request.
566 */
567 /*
568 * Ugh: If a reconnect attempt just happened, nm_so
569 * would have changed. NULL indicates a failed
570 * attempt that has essentially shut down this
571 * mount point.
572 */
573 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
574 nfs_sndunlock(rep);
575 return (EINTR);
576 }
577 so = rep->r_nmp->nm_so;
578 if (!so) {
579 error = nfs_reconnect(rep);
580 if (error) {
581 nfs_sndunlock(rep);
582 return (error);
583 }
584 goto tryagain;
585 }
586 while (rep->r_flags & R_MUSTRESEND) {
587 m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT);
588 nfsstats.rpcretries++;
589 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
590 if (error) {
591 if (error == EINTR || error == ERESTART ||
592 (error = nfs_reconnect(rep)) != 0) {
593 nfs_sndunlock(rep);
594 return (error);
595 }
596 goto tryagain;
597 }
598 }
599 nfs_sndunlock(rep);
600 if (sotype == SOCK_STREAM) {
601 /*
602 * Get the length marker from the stream
603 */
604 aio.iov_base = (caddr_t)&len;
605 aio.iov_len = sizeof(u_int32_t);
606 auio.uio_iov = &aio;
607 auio.uio_iovcnt = 1;
608 auio.uio_segflg = UIO_SYSSPACE;
609 auio.uio_rw = UIO_READ;
610 auio.uio_offset = 0;
611 auio.uio_resid = sizeof(u_int32_t);
612 auio.uio_td = td;
613 do {
614 rcvflg = MSG_WAITALL;
615 error = so_pru_soreceive(so, NULL, &auio, NULL,
616 NULL, &rcvflg);
617 if (error == EWOULDBLOCK && rep) {
618 if (rep->r_flags & R_SOFTTERM)
619 return (EINTR);
620 }
621 } while (error == EWOULDBLOCK);
622
623 if (error == 0 && auio.uio_resid > 0) {
624 /*
625 * Only log short packets if not EOF
626 */
627 if (auio.uio_resid != sizeof(u_int32_t))
628 log(LOG_INFO,
629 "short receive (%d/%d) from nfs server %s\n",
630 (int)(sizeof(u_int32_t) - auio.uio_resid),
631 (int)sizeof(u_int32_t),
632 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
633 error = EPIPE;
634 }
635 if (error)
636 goto errout;
637 len = ntohl(len) & ~0x80000000;
638 /*
639 * This is SERIOUS! We are out of sync with the sender
640 * and forcing a disconnect/reconnect is all I can do.
641 */
642 if (len > NFS_MAXPACKET) {
643 log(LOG_ERR, "%s (%d) from nfs server %s\n",
644 "impossible packet length",
645 len,
646 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
647 error = EFBIG;
648 goto errout;
649 }
650
651 /*
652 * Get the rest of the packet as an mbuf chain
653 */
654 sbinit(&sio, len);
655 do {
656 rcvflg = MSG_WAITALL;
657 error = so_pru_soreceive(so, NULL, NULL, &sio,
658 NULL, &rcvflg);
659 } while (error == EWOULDBLOCK || error == EINTR ||
660 error == ERESTART);
661 if (error == 0 && sio.sb_cc != len) {
662 if (sio.sb_cc != 0)
663 log(LOG_INFO,
664 "short receive (%d/%d) from nfs server %s\n",
665 len - auio.uio_resid, len,
666 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
667 error = EPIPE;
668 }
669 *mp = sio.sb_mb;
670 } else {
671 /*
672 * Non-stream, so get the whole packet by not
673 * specifying MSG_WAITALL and by specifying a large
674 * length.
675 *
676 * We have no use for control msg., but must grab them
677 * and then throw them away so we know what is going
678 * on.
679 */
680 sbinit(&sio, 100000000);
681 do {
682 rcvflg = 0;
683 error = so_pru_soreceive(so, NULL, NULL, &sio,
684 &control, &rcvflg);
685 if (control)
686 m_freem(control);
687 if (error == EWOULDBLOCK && rep) {
688 if (rep->r_flags & R_SOFTTERM) {
689 m_freem(sio.sb_mb);
690 return (EINTR);
691 }
692 }
693 } while (error == EWOULDBLOCK ||
694 (error == 0 && sio.sb_mb == NULL && control));
695 if ((rcvflg & MSG_EOR) == 0)
696 kprintf("Egad!!\n");
697 if (error == 0 && sio.sb_mb == NULL)
698 error = EPIPE;
699 len = sio.sb_cc;
700 *mp = sio.sb_mb;
701 }
702 errout:
703 if (error && error != EINTR && error != ERESTART) {
704 m_freem(*mp);
705 *mp = NULL;
706 if (error != EPIPE) {
707 log(LOG_INFO,
708 "receive error %d from nfs server %s\n",
709 error,
710 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
711 }
712 error = nfs_sndlock(rep);
713 if (!error) {
714 error = nfs_reconnect(rep);
715 if (!error)
716 goto tryagain;
717 else
718 nfs_sndunlock(rep);
719 }
720 }
721 } else {
722 if ((so = rep->r_nmp->nm_so) == NULL)
723 return (EACCES);
724 if (so->so_state & SS_ISCONNECTED)
725 getnam = NULL;
726 else
727 getnam = aname;
728 sbinit(&sio, 100000000);
729 do {
730 rcvflg = 0;
731 error = so_pru_soreceive(so, getnam, NULL, &sio,
732 NULL, &rcvflg);
733 if (error == EWOULDBLOCK &&
734 (rep->r_flags & R_SOFTTERM)) {
735 m_freem(sio.sb_mb);
736 return (EINTR);
737 }
738 } while (error == EWOULDBLOCK);
739 len = sio.sb_cc;
740 *mp = sio.sb_mb;
741 }
742 if (error) {
743 m_freem(*mp);
744 *mp = NULL;
745 }
746 /*
747 * Search for any mbufs that are not a multiple of 4 bytes long
748 * or with m_data not longword aligned.
749 * These could cause pointer alignment problems, so copy them to
750 * well aligned mbufs.
751 */
752 nfs_realign(mp, 5 * NFSX_UNSIGNED);
753 return (error);
754 }
755
756 /*
757 * Implement receipt of reply on a socket.
758 * We must search through the list of received datagrams matching them
759 * with outstanding requests using the xid, until ours is found.
760 */
761 /* ARGSUSED */
762 int
763 nfs_reply(struct nfsreq *myrep)
764 {
765 struct nfsreq *rep;
766 struct nfsmount *nmp = myrep->r_nmp;
767 int32_t t1;
768 struct mbuf *mrep, *md;
769 struct sockaddr *nam;
770 u_int32_t rxid, *tl;
771 caddr_t dpos, cp2;
772 int error;
773
774 /*
775 * Loop around until we get our own reply
776 */
777 for (;;) {
778 /*
779 * Lock against other receivers so that I don't get stuck in
780 * sbwait() after someone else has received my reply for me.
781 * Also necessary for connection based protocols to avoid
782 * race conditions during a reconnect.
783 * If nfs_rcvlock() returns EALREADY, that means that
784 * the reply has already been recieved by another
785 * process and we can return immediately. In this
786 * case, the lock is not taken to avoid races with
787 * other processes.
788 */
789 error = nfs_rcvlock(myrep);
790 if (error == EALREADY)
791 return (0);
792 if (error)
793 return (error);
794 /*
795 * Get the next Rpc reply off the socket
796 */
797 error = nfs_receive(myrep, &nam, &mrep);
798 nfs_rcvunlock(myrep);
799 if (error) {
800 /*
801 * Ignore routing errors on connectionless protocols??
802 */
803 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
804 nmp->nm_so->so_error = 0;
805 if (myrep->r_flags & R_GETONEREP)
806 return (0);
807 continue;
808 }
809 return (error);
810 }
811 if (nam)
812 FREE(nam, M_SONAME);
813
814 /*
815 * Get the xid and check that it is an rpc reply
816 */
817 md = mrep;
818 dpos = mtod(md, caddr_t);
819 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED);
820 rxid = *tl++;
821 if (*tl != rpc_reply) {
822 nfsstats.rpcinvalid++;
823 m_freem(mrep);
824 nfsmout:
825 if (myrep->r_flags & R_GETONEREP)
826 return (0);
827 continue;
828 }
829
830 /*
831 * Loop through the request list to match up the reply
832 * Iff no match, just drop the datagram. On match, set
833 * r_mrep atomically to prevent the timer from messing
834 * around with the request after we have exited the critical
835 * section.
836 */
837 crit_enter();
838 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
839 if (rep->r_mrep == NULL && rxid == rep->r_xid) {
840 rep->r_mrep = mrep;
841 break;
842 }
843 }
844 crit_exit();
845
846 /*
847 * Fill in the rest of the reply if we found a match.
848 */
849 if (rep) {
850 rep->r_md = md;
851 rep->r_dpos = dpos;
852 if (nfsrtton) {
853 struct rttl *rt;
854
855 rt = &nfsrtt.rttl[nfsrtt.pos];
856 rt->proc = rep->r_procnum;
857 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
858 rt->sent = nmp->nm_sent;
859 rt->cwnd = nmp->nm_cwnd;
860 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
861 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
862 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
863 getmicrotime(&rt->tstamp);
864 if (rep->r_flags & R_TIMING)
865 rt->rtt = rep->r_rtt;
866 else
867 rt->rtt = 1000000;
868 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
869 }
870 /*
871 * Update congestion window.
872 * Do the additive increase of
873 * one rpc/rtt.
874 */
875 if (nmp->nm_cwnd <= nmp->nm_sent) {
876 nmp->nm_cwnd +=
877 (NFS_CWNDSCALE * NFS_CWNDSCALE +
878 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
879 if (nmp->nm_cwnd > NFS_MAXCWND)
880 nmp->nm_cwnd = NFS_MAXCWND;
881 }
882 crit_enter(); /* nfs_timer interlock for nm_sent */
883 if (rep->r_flags & R_SENT) {
884 rep->r_flags &= ~R_SENT;
885 nmp->nm_sent -= NFS_CWNDSCALE;
886 }
887 crit_exit();
888 /*
889 * Update rtt using a gain of 0.125 on the mean
890 * and a gain of 0.25 on the deviation.
891 */
892 if (rep->r_flags & R_TIMING) {
893 /*
894 * Since the timer resolution of
895 * NFS_HZ is so course, it can often
896 * result in r_rtt == 0. Since
897 * r_rtt == N means that the actual
898 * rtt is between N+dt and N+2-dt ticks,
899 * add 1.
900 */
901 t1 = rep->r_rtt + 1;
902 t1 -= (NFS_SRTT(rep) >> 3);
903 NFS_SRTT(rep) += t1;
904 if (t1 < 0)
905 t1 = -t1;
906 t1 -= (NFS_SDRTT(rep) >> 2);
907 NFS_SDRTT(rep) += t1;
908 }
909 nmp->nm_timeouts = 0;
910 }
911 /*
912 * If not matched to a request, drop it.
913 * If it's mine, get out.
914 */
915 if (rep == NULL) {
916 nfsstats.rpcunexpected++;
917 m_freem(mrep);
918 } else if (rep == myrep) {
919 if (rep->r_mrep == NULL)
920 panic("nfsreply nil");
921 return (0);
922 }
923 if (myrep->r_flags & R_GETONEREP)
924 return (0);
925 }
926 }
927
928 /*
929 * nfs_request - goes something like this
930 * - fill in request struct
931 * - links it into list
932 * - calls nfs_send() for first transmit
933 * - calls nfs_receive() to get reply
934 * - break down rpc header and return with nfs reply pointed to
935 * by mrep or error
936 * nb: always frees up mreq mbuf list
937 */
938 int
939 nfs_request(struct vnode *vp, struct mbuf *mrest, int procnum,
940 struct thread *td, struct ucred *cred, struct mbuf **mrp,
941 struct mbuf **mdp, caddr_t *dposp)
942 {
943 struct mbuf *mrep, *m2;
944 struct nfsreq *rep;
945 u_int32_t *tl;
946 int i;
947 struct nfsmount *nmp;
948 struct mbuf *m, *md, *mheadend;
949 char nickv[RPCX_NICKVERF];
950 time_t waituntil;
951 caddr_t dpos, cp2;
952 int t1, error = 0, mrest_len, auth_len, auth_type;
953 int trylater_delay = 15, trylater_cnt = 0, failed_auth = 0;
954 int verf_len, verf_type;
955 u_int32_t xid;
956 char *auth_str, *verf_str;
957 NFSKERBKEY_T key; /* save session key */
958
959 /* Reject requests while attempting a forced unmount. */
960 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
961 m_freem(mrest);
962 return (ESTALE);
963 }
964 nmp = VFSTONFS(vp->v_mount);
965 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
966 rep->r_nmp = nmp;
967 rep->r_vp = vp;
968 rep->r_td = td;
969 rep->r_procnum = procnum;
970 rep->r_mreq = NULL;
971 i = 0;
972 m = mrest;
973 while (m) {
974 i += m->m_len;
975 m = m->m_next;
976 }
977 mrest_len = i;
978
979 /*
980 * Get the RPC header with authorization.
981 */
982 kerbauth:
983 verf_str = auth_str = (char *)0;
984 if (nmp->nm_flag & NFSMNT_KERB) {
985 verf_str = nickv;
986 verf_len = sizeof (nickv);
987 auth_type = RPCAUTH_KERB4;
988 bzero((caddr_t)key, sizeof (key));
989 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str,
990 &auth_len, verf_str, verf_len)) {
991 error = nfs_getauth(nmp, rep, cred, &auth_str,
992 &auth_len, verf_str, &verf_len, key);
993 if (error) {
994 kfree((caddr_t)rep, M_NFSREQ);
995 m_freem(mrest);
996 return (error);
997 }
998 }
999 } else {
1000 auth_type = RPCAUTH_UNIX;
1001 if (cred->cr_ngroups < 1)
1002 panic("nfsreq nogrps");
1003 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ?
1004 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) +
1005 5 * NFSX_UNSIGNED;
1006 }
1007 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len,
1008 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid);
1009 if (auth_str)
1010 kfree(auth_str, M_TEMP);
1011
1012 /*
1013 * For stream protocols, insert a Sun RPC Record Mark.
1014 */
1015 if (nmp->nm_sotype == SOCK_STREAM) {
1016 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
1017 if (m == NULL) {
1018 kfree(rep, M_NFSREQ);
1019 return (ENOBUFS);
1020 }
1021 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1022 (m->m_pkthdr.len - NFSX_UNSIGNED));
1023 }
1024 rep->r_mreq = m;
1025 rep->r_xid = xid;
1026 tryagain:
1027 if (nmp->nm_flag & NFSMNT_SOFT)
1028 rep->r_retry = nmp->nm_retry;
1029 else
1030 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
1031 rep->r_rtt = rep->r_rexmit = 0;
1032 if (proct[procnum] > 0)
1033 rep->r_flags = R_TIMING | R_MASKTIMER;
1034 else
1035 rep->r_flags = R_MASKTIMER;
1036 rep->r_mrep = NULL;
1037
1038 /*
1039 * Do the client side RPC.
1040 */
1041 nfsstats.rpcrequests++;
1042
1043 /*
1044 * Chain request into list of outstanding requests. Be sure
1045 * to put it LAST so timer finds oldest requests first. Note
1046 * that R_MASKTIMER is set at the moment to prevent any timer
1047 * action on this request while we are still doing processing on
1048 * it below. splsoftclock() primarily protects nm_sent. Note
1049 * that we may block in this code so there is no atomicy guarentee.
1050 */
1051 crit_enter();
1052 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
1053
1054 /*
1055 * If backing off another request or avoiding congestion, don't
1056 * send this one now but let timer do it. If not timing a request,
1057 * do it now.
1058 *
1059 * Even though the timer will not mess with our request there is
1060 * still the possibility that we will race a reply (which clears
1061 * R_SENT), especially on localhost connections, so be very careful
1062 * when setting R_SENT. We could set R_SENT prior to calling
1063 * nfs_send() but why bother if the response occurs that quickly?
1064 */
1065 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
1066 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1067 nmp->nm_sent < nmp->nm_cwnd)) {
1068 if (nmp->nm_soflags & PR_CONNREQUIRED)
1069 error = nfs_sndlock(rep);
1070 if (!error) {
1071 m2 = m_copym(m, 0, M_COPYALL, MB_WAIT);
1072 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1073 if (nmp->nm_soflags & PR_CONNREQUIRED)
1074 nfs_sndunlock(rep);
1075 }
1076 if (!error && (rep->r_flags & R_MUSTRESEND) == 0 &&
1077 rep->r_mrep == NULL) {
1078 KASSERT((rep->r_flags & R_SENT) == 0,
1079 ("R_SENT ASSERT %p", rep));
1080 nmp->nm_sent += NFS_CWNDSCALE;
1081 rep->r_flags |= R_SENT;
1082 }
1083 } else {
1084 rep->r_rtt = -1;
1085 }
1086
1087 /*
1088 * Let the timer do what it will with the request, then
1089 * wait for the reply from our send or the timer's.
1090 */
1091 if (!error || error == EPIPE) {
1092 rep->r_flags &= ~R_MASKTIMER;
1093 crit_exit();
1094 error = nfs_reply(rep);
1095 crit_enter();
1096 }
1097
1098 /*
1099 * RPC done, unlink the request, but don't rip it out from under
1100 * the callout timer.
1101 */
1102 while (rep->r_flags & R_LOCKED) {
1103 nfs_timer_raced = 1;
1104 tsleep(&nfs_timer_raced, 0, "nfstrac", 0);
1105 }
1106 TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
1107
1108 /*
1109 * Decrement the outstanding request count.
1110 */
1111 if (rep->r_flags & R_SENT) {
1112 rep->r_flags &= ~R_SENT;
1113 nmp->nm_sent -= NFS_CWNDSCALE;
1114 }
1115 crit_exit();
1116
1117 /*
1118 * If there was a successful reply and a tprintf msg.
1119 * tprintf a response.
1120 */
1121 if (!error && (rep->r_flags & R_TPRINTFMSG))
1122 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
1123 "is alive again");
1124 mrep = rep->r_mrep;
1125 md = rep->r_md;
1126 dpos = rep->r_dpos;
1127 if (error) {
1128 m_freem(rep->r_mreq);
1129 kfree((caddr_t)rep, M_NFSREQ);
1130 return (error);
1131 }
1132
1133 /*
1134 * break down the rpc header and check if ok
1135 */
1136 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1137 if (*tl++ == rpc_msgdenied) {
1138 if (*tl == rpc_mismatch)
1139 error = EOPNOTSUPP;
1140 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1141 if (!failed_auth) {
1142 failed_auth++;
1143 mheadend->m_next = (struct mbuf *)0;
1144 m_freem(mrep);
1145 m_freem(rep->r_mreq);
1146 goto kerbauth;
1147 } else
1148 error = EAUTH;
1149 } else
1150 error = EACCES;
1151 m_freem(mrep);
1152 m_freem(rep->r_mreq);
1153 kfree((caddr_t)rep, M_NFSREQ);
1154 return (error);
1155 }
1156
1157 /*
1158 * Grab any Kerberos verifier, otherwise just throw it away.
1159 */
1160 verf_type = fxdr_unsigned(int, *tl++);
1161 i = fxdr_unsigned(int32_t, *tl);
1162 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1163 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1164 if (error)
1165 goto nfsmout;
1166 } else if (i > 0)
1167 nfsm_adv(nfsm_rndup(i));
1168 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1169 /* 0 == ok */
1170 if (*tl == 0) {
1171 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1172 if (*tl != 0) {
1173 error = fxdr_unsigned(int, *tl);
1174 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1175 error == NFSERR_TRYLATER) {
1176 m_freem(mrep);
1177 error = 0;
1178 waituntil = time_second + trylater_delay;
1179 while (time_second < waituntil)
1180 (void) tsleep((caddr_t)&lbolt,
1181 0, "nqnfstry", 0);
1182 trylater_delay *= nfs_backoff[trylater_cnt];
1183 if (trylater_cnt < 7)
1184 trylater_cnt++;
1185 goto tryagain;
1186 }
1187
1188 /*
1189 * If the File Handle was stale, invalidate the
1190 * lookup cache, just in case.
1191 *
1192 * To avoid namecache<->vnode deadlocks we must
1193 * release the vnode lock if we hold it.
1194 */
1195 if (error == ESTALE) {
1196 int ltype;
1197
1198 ltype = lockstatus(&vp->v_lock, curthread);
1199 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED)
1200 lockmgr(&vp->v_lock, LK_RELEASE);
1201 cache_inval_vp(vp, CINV_CHILDREN);
1202 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED)
1203 lockmgr(&vp->v_lock, ltype);
1204 }
1205 if (nmp->nm_flag & NFSMNT_NFSV3) {
1206 *mrp = mrep;
1207 *mdp = md;
1208 *dposp = dpos;
1209 error |= NFSERR_RETERR;
1210 } else
1211 m_freem(mrep);
1212 m_freem(rep->r_mreq);
1213 kfree((caddr_t)rep, M_NFSREQ);
1214 return (error);
1215 }
1216
1217 *mrp = mrep;
1218 *mdp = md;
1219 *dposp = dpos;
1220 m_freem(rep->r_mreq);
1221 FREE((caddr_t)rep, M_NFSREQ);
1222 return (0);
1223 }
1224 m_freem(mrep);
1225 error = EPROTONOSUPPORT;
1226 nfsmout:
1227 m_freem(rep->r_mreq);
1228 kfree((caddr_t)rep, M_NFSREQ);
1229 return (error);
1230 }
1231
1232 #ifndef NFS_NOSERVER
1233 /*
1234 * Generate the rpc reply header
1235 * siz arg. is used to decide if adding a cluster is worthwhile
1236 */
1237 int
1238 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp,
1239 int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp)
1240 {
1241 u_int32_t *tl;
1242 struct mbuf *mreq;
1243 caddr_t bpos;
1244 struct mbuf *mb, *mb2;
1245
1246 siz += RPC_REPLYSIZ;
1247 mb = mreq = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL);
1248 mreq->m_pkthdr.len = 0;
1249 /*
1250 * If this is not a cluster, try and leave leading space
1251 * for the lower level headers.
1252 */
1253 if ((max_hdr + siz) < MINCLSIZE)
1254 mreq->m_data += max_hdr;
1255 tl = mtod(mreq, u_int32_t *);
1256 mreq->m_len = 6 * NFSX_UNSIGNED;
1257 bpos = ((caddr_t)tl) + mreq->m_len;
1258 *tl++ = txdr_unsigned(nd->nd_retxid);
1259 *tl++ = rpc_reply;
1260 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1261 *tl++ = rpc_msgdenied;
1262 if (err & NFSERR_AUTHERR) {
1263 *tl++ = rpc_autherr;
1264 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1265 mreq->m_len -= NFSX_UNSIGNED;
1266 bpos -= NFSX_UNSIGNED;
1267 } else {
1268 *tl++ = rpc_mismatch;
1269 *tl++ = txdr_unsigned(RPC_VER2);
1270 *tl = txdr_unsigned(RPC_VER2);
1271 }
1272 } else {
1273 *tl++ = rpc_msgaccepted;
1274
1275 /*
1276 * For Kerberos authentication, we must send the nickname
1277 * verifier back, otherwise just RPCAUTH_NULL.
1278 */
1279 if (nd->nd_flag & ND_KERBFULL) {
1280 struct nfsuid *nuidp;
1281 struct timeval ktvin, ktvout;
1282
1283 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1284 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1285 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1286 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1287 &nuidp->nu_haddr, nd->nd_nam2)))
1288 break;
1289 }
1290 if (nuidp) {
1291 ktvin.tv_sec =
1292 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1293 ktvin.tv_usec =
1294 txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1295
1296 /*
1297 * Encrypt the timestamp in ecb mode using the
1298 * session key.
1299 */
1300 #ifdef NFSKERB
1301 XXX
1302 #endif
1303
1304 *tl++ = rpc_auth_kerb;
1305 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1306 *tl = ktvout.tv_sec;
1307 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1308 *tl++ = ktvout.tv_usec;
1309 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1310 } else {
1311 *tl++ = 0;
1312 *tl++ = 0;
1313 }
1314 } else {
1315 *tl++ = 0;
1316 *tl++ = 0;
1317 }
1318 switch (err) {
1319 case EPROGUNAVAIL:
1320 *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1321 break;
1322 case EPROGMISMATCH:
1323 *tl = txdr_unsigned(RPC_PROGMISMATCH);
1324 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1325 *tl++ = txdr_unsigned(2);
1326 *tl = txdr_unsigned(3);
1327 break;
1328 case EPROCUNAVAIL:
1329 *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1330 break;
1331 case EBADRPC:
1332 *tl = txdr_unsigned(RPC_GARBAGE);
1333 break;
1334 default:
1335 *tl = 0;
1336 if (err != NFSERR_RETVOID) {
1337 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1338 if (err)
1339 *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1340 else
1341 *tl = 0;
1342 }
1343 break;
1344 };
1345 }
1346
1347 if (mrq != NULL)
1348 *mrq = mreq;
1349 *mbp = mb;
1350 *bposp = bpos;
1351 if (err != 0 && err != NFSERR_RETVOID)
1352 nfsstats.srvrpc_errs++;
1353 return (0);
1354 }
1355
1356
1357 #endif /* NFS_NOSERVER */
1358 /*
1359 * Nfs timer routine
1360 * Scan the nfsreq list and retranmit any requests that have timed out
1361 * To avoid retransmission attempts on STREAM sockets (in the future) make
1362 * sure to set the r_retry field to 0 (implies nm_retry == 0).
1363 */
1364 void
1365 nfs_timer(void *arg /* never used */)
1366 {
1367 struct nfsreq *rep;
1368 struct mbuf *m;
1369 struct socket *so;
1370 struct nfsmount *nmp;
1371 int timeo;
1372 int error;
1373 #ifndef NFS_NOSERVER
1374 struct nfssvc_sock *slp;
1375 u_quad_t cur_usec;
1376 #endif /* NFS_NOSERVER */
1377 struct thread *td = &thread0; /* XXX for credentials, will break if sleep */
1378
1379 crit_enter();
1380 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
1381 nmp = rep->r_nmp;
1382 if (rep->r_mrep || (rep->r_flags & (R_SOFTTERM|R_MASKTIMER)))
1383 continue;
1384 rep->r_flags |= R_LOCKED;
1385 if (nfs_sigintr(nmp, rep, rep->r_td)) {
1386 nfs_softterm(rep);
1387 goto skip;
1388 }
1389 if (rep->r_rtt >= 0) {
1390 rep->r_rtt++;
1391 if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1392 timeo = nmp->nm_timeo;
1393 else
1394 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1395 if (nmp->nm_timeouts > 0)
1396 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1397 if (rep->r_rtt <= timeo)
1398 goto skip;
1399 if (nmp->nm_timeouts < 8)
1400 nmp->nm_timeouts++;
1401 }
1402 /*
1403 * Check for server not responding
1404 */
1405 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1406 rep->r_rexmit > nmp->nm_deadthresh) {
1407 nfs_msg(rep->r_td,
1408 nmp->nm_mountp->mnt_stat.f_mntfromname,
1409 "not responding");
1410 rep->r_flags |= R_TPRINTFMSG;
1411 }
1412 if (rep->r_rexmit >= rep->r_retry) { /* too many */
1413 nfsstats.rpctimeouts++;
1414 nfs_softterm(rep);
1415 goto skip;
1416 }
1417 if (nmp->nm_sotype != SOCK_DGRAM) {
1418 if (++rep->r_rexmit > NFS_MAXREXMIT)
1419 rep->r_rexmit = NFS_MAXREXMIT;
1420 goto skip;
1421 }
1422 if ((so = nmp->nm_so) == NULL)
1423 goto skip;
1424
1425 /*
1426 * If there is enough space and the window allows..
1427 * Resend it
1428 * Set r_rtt to -1 in case we fail to send it now.
1429 */
1430 rep->r_rtt = -1;
1431 if (ssb_space(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1432 ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1433 (rep->r_flags & R_SENT) ||
1434 nmp->nm_sent < nmp->nm_cwnd) &&
1435 (m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){
1436 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1437 error = so_pru_send(so, 0, m, (struct sockaddr *)0,
1438 (struct mbuf *)0, td);
1439 else
1440 error = so_pru_send(so, 0, m, nmp->nm_nam,
1441 (struct mbuf *)0, td);
1442 if (error) {
1443 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1444 so->so_error = 0;
1445 } else if (rep->r_mrep == NULL) {
1446 /*
1447 * Iff first send, start timing
1448 * else turn timing off, backoff timer
1449 * and divide congestion window by 2.
1450 *
1451 * It is possible for the so_pru_send() to
1452 * block and for us to race a reply so we
1453 * only do this if the reply field has not
1454 * been filled in. R_LOCKED will prevent
1455 * the request from being ripped out from under
1456 * us entirely.
1457 */
1458 if (rep->r_flags & R_SENT) {
1459 rep->r_flags &= ~R_TIMING;
1460 if (++rep->r_rexmit > NFS_MAXREXMIT)
1461 rep->r_rexmit = NFS_MAXREXMIT;
1462 nmp->nm_cwnd >>= 1;
1463 if (nmp->nm_cwnd < NFS_CWNDSCALE)
1464 nmp->nm_cwnd = NFS_CWNDSCALE;
1465 nfsstats.rpcretries++;
1466 } else {
1467 rep->r_flags |= R_SENT;
1468 nmp->nm_sent += NFS_CWNDSCALE;
1469 }
1470 rep->r_rtt = 0;
1471 }
1472 }
1473 skip:
1474 rep->r_flags &= ~R_LOCKED;
1475 }
1476 #ifndef NFS_NOSERVER
1477
1478 /*
1479 * Scan the write gathering queues for writes that need to be
1480 * completed now.
1481 */
1482 cur_usec = nfs_curusec();
1483 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
1484 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1485 nfsrv_wakenfsd(slp, 1);
1486 }
1487 #endif /* NFS_NOSERVER */
1488
1489 /*
1490 * Due to possible blocking, a client operation may be waiting for
1491 * us to finish processing this request so it can remove it.
1492 */
1493 if (nfs_timer_raced) {
1494 nfs_timer_raced = 0;
1495 wakeup(&nfs_timer_raced);
1496 }
1497 crit_exit();
1498 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL);
1499 }
1500
1501 /*
1502 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1503 * wait for all requests to complete. This is used by forced unmounts
1504 * to terminate any outstanding RPCs.
1505 */
1506 int
1507 nfs_nmcancelreqs(struct nfsmount *nmp)
1508 {
1509 struct nfsreq *req;
1510 int i;
1511
1512 crit_enter();
1513 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1514 if (nmp != req->r_nmp || req->r_mrep != NULL ||
1515 (req->r_flags & R_SOFTTERM)) {
1516 continue;
1517 }
1518 nfs_softterm(req);
1519 }
1520 crit_exit();
1521
1522 for (i = 0; i < 30; i++) {
1523 crit_enter();
1524 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1525 if (nmp == req->r_nmp)
1526 break;
1527 }
1528 crit_exit();
1529 if (req == NULL)
1530 return (0);
1531 tsleep(&lbolt, 0, "nfscancel", 0);
1532 }
1533 return (EBUSY);
1534 }
1535
1536 /*
1537 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
1538 * The nm_send count is decremented now to avoid deadlocks when the process in
1539 * soreceive() hasn't yet managed to send its own request.
1540 *
1541 * This routine must be called at splsoftclock() to protect r_flags and
1542 * nm_sent.
1543 */
1544
1545 static void
1546 nfs_softterm(struct nfsreq *rep)
1547 {
1548 rep->r_flags |= R_SOFTTERM;
1549
1550 if (rep->r_flags & R_SENT) {
1551 rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
1552 rep->r_flags &= ~R_SENT;
1553 }
1554 }
1555
1556 /*
1557 * Test for a termination condition pending on the process.
1558 * This is used for NFSMNT_INT mounts.
1559 */
1560 int
1561 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
1562 {
1563 sigset_t tmpset;
1564 struct proc *p;
1565 struct lwp *lp;
1566
1567 if (rep && (rep->r_flags & R_SOFTTERM))
1568 return (EINTR);
1569 /* Terminate all requests while attempting a forced unmount. */
1570 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1571 return (EINTR);
1572 if (!(nmp->nm_flag & NFSMNT_INT))
1573 return (0);
1574 /* td might be NULL YYY */
1575 if (td == NULL || (p = td->td_proc) == NULL)
1576 return (0);
1577
1578 lp = td->td_lwp;
1579 tmpset = lwp_sigpend(lp);
1580 SIGSETNAND(tmpset, lp->lwp_sigmask);
1581 SIGSETNAND(tmpset, p->p_sigignore);
1582 if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset))
1583 return (EINTR);
1584
1585 return (0);
1586 }
1587
1588 /*
1589 * Lock a socket against others.
1590 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
1591 * and also to avoid race conditions between the processes with nfs requests
1592 * in progress when a reconnect is necessary.
1593 */
1594 int
1595 nfs_sndlock(struct nfsreq *rep)
1596 {
1597 int *statep = &rep->r_nmp->nm_state;
1598 struct thread *td;
1599 int slptimeo;
1600 int slpflag;
1601 int error;
1602
1603 slpflag = 0;
1604 slptimeo = 0;
1605 td = rep->r_td;
1606 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1607 slpflag = PCATCH;
1608
1609 error = 0;
1610 crit_enter();
1611 while (*statep & NFSSTA_SNDLOCK) {
1612 *statep |= NFSSTA_WANTSND;
1613 if (nfs_sigintr(rep->r_nmp, rep, td)) {
1614 error = EINTR;
1615 break;
1616 }
1617 tsleep((caddr_t)statep, slpflag, "nfsndlck", slptimeo);
1618 if (slpflag == PCATCH) {
1619 slpflag = 0;
1620 slptimeo = 2 * hz;
1621 }
1622 }
1623 /* Always fail if our request has been cancelled. */
1624 if ((rep->r_flags & R_SOFTTERM))
1625 error = EINTR;
1626 if (error == 0)
1627 *statep |= NFSSTA_SNDLOCK;
1628 crit_exit();
1629 return (error);
1630 }
1631
1632 /*
1633 * Unlock the stream socket for others.
1634 */
1635 void
1636 nfs_sndunlock(struct nfsreq *rep)
1637 {
1638 int *statep = &rep->r_nmp->nm_state;
1639
1640 if ((*statep & NFSSTA_SNDLOCK) == 0)
1641 panic("nfs sndunlock");
1642 crit_enter();
1643 *statep &= ~NFSSTA_SNDLOCK;
1644 if (*statep & NFSSTA_WANTSND) {
1645 *statep &= ~NFSSTA_WANTSND;
1646 wakeup((caddr_t)statep);
1647 }
1648 crit_exit();
1649 }
1650
1651 static int
1652 nfs_rcvlock(struct nfsreq *rep)
1653 {
1654 int *statep = &rep->r_nmp->nm_state;
1655 int slpflag;
1656 int slptimeo;
1657 int error;
1658
1659 /*
1660 * Unconditionally check for completion in case another nfsiod
1661 * get the packet while the caller was blocked, before the caller
1662 * called us. Packet reception is handled by mainline code which
1663 * is protected by the BGL at the moment.
1664 *
1665 * We do not strictly need the second check just before the
1666 * tsleep(), but it's good defensive programming.
1667 */
1668 if (rep->r_mrep != NULL)
1669 return (EALREADY);
1670
1671 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1672 slpflag = PCATCH;
1673 else
1674 slpflag = 0;
1675 slptimeo = 0;
1676 error = 0;
1677 crit_enter();
1678 while (*statep & NFSSTA_RCVLOCK) {
1679 if (nfs_sigintr(rep->r_nmp, rep, rep->r_td)) {
1680 error = EINTR;
1681 break;
1682 }
1683 if (rep->r_mrep != NULL) {
1684 error = EALREADY;
1685 break;
1686 }
1687 *statep |= NFSSTA_WANTRCV;
1688 tsleep((caddr_t)statep, slpflag, "nfsrcvlk", slptimeo);
1689 /*
1690 * If our reply was recieved while we were sleeping,
1691 * then just return without taking the lock to avoid a
1692 * situation where a single iod could 'capture' the
1693 * recieve lock.
1694 */
1695 if (rep->r_mrep != NULL) {
1696 error = EALREADY;
1697 break;
1698 }
1699 if (slpflag == PCATCH) {
1700 slpflag = 0;
1701 slptimeo = 2 * hz;
1702 }
1703 }
1704 if (error == 0) {
1705 *statep |= NFSSTA_RCVLOCK;
1706 rep->r_nmp->nm_rcvlock_td = curthread; /* DEBUGGING */
1707 }
1708 crit_exit();
1709 return (error);
1710 }
1711
1712 /*
1713 * Unlock the stream socket for others.
1714 */
1715 static void
1716 nfs_rcvunlock(struct nfsreq *rep)
1717 {
1718 int *statep = &rep->r_nmp->nm_state;
1719
1720 if ((*statep & NFSSTA_RCVLOCK) == 0)
1721 panic("nfs rcvunlock");
1722 crit_enter();
1723 rep->r_nmp->nm_rcvlock_td = (void *)-1; /* DEBUGGING */
1724 *statep &= ~NFSSTA_RCVLOCK;
1725 if (*statep & NFSSTA_WANTRCV) {
1726 *statep &= ~NFSSTA_WANTRCV;
1727 wakeup((caddr_t)statep);
1728 }
1729 crit_exit();
1730 }
1731
1732 /*
1733 * nfs_realign:
1734 *
1735 * Check for badly aligned mbuf data and realign by copying the unaligned
1736 * portion of the data into a new mbuf chain and freeing the portions
1737 * of the old chain that were replaced.
1738 *
1739 * We cannot simply realign the data within the existing mbuf chain
1740 * because the underlying buffers may contain other rpc commands and
1741 * we cannot afford to overwrite them.
1742 *
1743 * We would prefer to avoid this situation entirely. The situation does
1744 * not occur with NFS/UDP and is supposed to only occassionally occur
1745 * with TCP. Use vfs.nfs.realign_count and realign_test to check this.
1746 */
1747 static void
1748 nfs_realign(struct mbuf **pm, int hsiz)
1749 {
1750 struct mbuf *m;
1751 struct mbuf *n = NULL;
1752 int off = 0;
1753
1754 ++nfs_realign_test;
1755
1756 while ((m = *pm) != NULL) {
1757 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
1758 n = m_getl(m->m_len, MB_WAIT, MT_DATA, 0, NULL);
1759 n->m_len = 0;
1760 break;
1761 }
1762 pm = &m->m_next;
1763 }
1764
1765 /*
1766 * If n is non-NULL, loop on m copying data, then replace the
1767 * portion of the chain that had to be realigned.
1768 */
1769 if (n != NULL) {
1770 ++nfs_realign_count;
1771 while (m) {
1772 m_copyback(n, off, m->m_len, mtod(m, caddr_t));
1773 off += m->m_len;
1774 m = m->m_next;
1775 }
1776 m_freem(*pm);
1777 *pm = n;
1778 }
1779 }
1780
1781 #ifndef NFS_NOSERVER
1782
1783 /*
1784 * Parse an RPC request
1785 * - verify it
1786 * - fill in the cred struct.
1787 */
1788 int
1789 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header)
1790 {
1791 int len, i;
1792 u_int32_t *tl;
1793 int32_t t1;
1794 struct uio uio;
1795 struct iovec iov;
1796 caddr_t dpos, cp2, cp;
1797 u_int32_t nfsvers, auth_type;
1798 uid_t nickuid;
1799 int error = 0, ticklen;
1800 struct mbuf *mrep, *md;
1801 struct nfsuid *nuidp;
1802 struct timeval tvin, tvout;
1803 #if 0 /* until encrypted keys are implemented */
1804 NFSKERBKEYSCHED_T keys; /* stores key schedule */
1805 #endif
1806
1807 mrep = nd->nd_mrep;
1808 md = nd->nd_md;
1809 dpos = nd->nd_dpos;
1810 if (has_header) {
1811 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED);
1812 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
1813 if (*tl++ != rpc_call) {
1814 m_freem(mrep);
1815 return (EBADRPC);
1816 }
1817 } else
1818 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED);
1819 nd->nd_repstat = 0;
1820 nd->nd_flag = 0;
1821 if (*tl++ != rpc_vers) {
1822 nd->nd_repstat = ERPCMISMATCH;
1823 nd->nd_procnum = NFSPROC_NOOP;
1824 return (0);
1825 }
1826 if (*tl != nfs_prog) {
1827 nd->nd_repstat = EPROGUNAVAIL;
1828 nd->nd_procnum = NFSPROC_NOOP;
1829 return (0);
1830 }
1831 tl++;
1832 nfsvers = fxdr_unsigned(u_int32_t, *tl++);
1833 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) {
1834 nd->nd_repstat = EPROGMISMATCH;
1835 nd->nd_procnum = NFSPROC_NOOP;
1836 return (0);
1837 }
1838 if (nfsvers == NFS_VER3)
1839 nd->nd_flag = ND_NFSV3;
1840 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
1841 if (nd->nd_procnum == NFSPROC_NULL)
1842 return (0);
1843 if (nd->nd_procnum >= NFS_NPROCS ||
1844 (nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
1845 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
1846 nd->nd_repstat = EPROCUNAVAIL;
1847 nd->nd_procnum = NFSPROC_NOOP;
1848 return (0);
1849 }
1850 if ((nd->nd_flag & ND_NFSV3) == 0)
1851 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
1852 auth_type = *tl++;
1853 len = fxdr_unsigned(int, *tl++);
1854 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1855 m_freem(mrep);
1856 return (EBADRPC);
1857 }
1858
1859 nd->nd_flag &= ~ND_KERBAUTH;
1860 /*
1861 * Handle auth_unix or auth_kerb.
1862 */
1863 if (auth_type == rpc_auth_unix) {
1864 len = fxdr_unsigned(int, *++tl);
1865 if (len < 0 || len > NFS_MAXNAMLEN) {
1866 m_freem(mrep);
1867 return (EBADRPC);
1868 }
1869 nfsm_adv(nfsm_rndup(len));
1870 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1871 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
1872 nd->nd_cr.cr_ref = 1;
1873 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
1874 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
1875 len = fxdr_unsigned(int, *tl);
1876 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
1877 m_freem(mrep);
1878 return (EBADRPC);
1879 }
1880 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED);
1881 for (i = 1; i <= len; i++)
1882 if (i < NGROUPS)
1883 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
1884 else
1885 tl++;
1886 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
1887 if (nd->nd_cr.cr_ngroups > 1)
1888 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
1889 len = fxdr_unsigned(int, *++tl);
1890 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1891 m_freem(mrep);
1892 return (EBADRPC);
1893 }
1894 if (len > 0)
1895 nfsm_adv(nfsm_rndup(len));
1896 } else if (auth_type == rpc_auth_kerb) {
1897 switch (fxdr_unsigned(int, *tl++)) {
1898 case RPCAKN_FULLNAME:
1899 ticklen = fxdr_unsigned(int, *tl);
1900 *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
1901 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
1902 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
1903 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
1904 m_freem(mrep);
1905 return (EBADRPC);
1906 }
1907 uio.uio_offset = 0;
1908 uio.uio_iov = &iov;
1909 uio.uio_iovcnt = 1;
1910 uio.uio_segflg = UIO_SYSSPACE;
1911 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
1912 iov.iov_len = RPCAUTH_MAXSIZ - 4;
1913 nfsm_mtouio(&uio, uio.uio_resid);
1914 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1915 if (*tl++ != rpc_auth_kerb ||
1916 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
1917 kprintf("Bad kerb verifier\n");
1918 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1919 nd->nd_procnum = NFSPROC_NOOP;
1920 return (0);
1921 }
1922 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED);
1923 tl = (u_int32_t *)cp;
1924 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
1925 kprintf("Not fullname kerb verifier\n");
1926 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1927 nd->nd_procnum = NFSPROC_NOOP;
1928 return (0);
1929 }
1930 cp += NFSX_UNSIGNED;
1931 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
1932 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
1933 nd->nd_flag |= ND_KERBFULL;
1934 nfsd->nfsd_flag |= NFSD_NEEDAUTH;
1935 break;
1936 case RPCAKN_NICKNAME:
1937 if (len != 2 * NFSX_UNSIGNED) {
1938 kprintf("Kerb nickname short\n");
1939 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
1940 nd->nd_procnum = NFSPROC_NOOP;
1941 return (0);
1942 }
1943 nickuid = fxdr_unsigned(uid_t, *tl);
1944 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1945 if (*tl++ != rpc_auth_kerb ||
1946 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
1947 kprintf("Kerb nick verifier bad\n");
1948 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1949 nd->nd_procnum = NFSPROC_NOOP;
1950 return (0);
1951 }
1952 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1953 tvin.tv_sec = *tl++;
1954 tvin.tv_usec = *tl;
1955
1956 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
1957 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1958 if (nuidp->nu_cr.cr_uid == nickuid &&
1959 (!nd->nd_nam2 ||
1960 netaddr_match(NU_NETFAM(nuidp),
1961 &nuidp->nu_haddr, nd->nd_nam2)))
1962 break;
1963 }
1964 if (!nuidp) {
1965 nd->nd_repstat =
1966 (NFSERR_AUTHERR|AUTH_REJECTCRED);
1967 nd->nd_procnum = NFSPROC_NOOP;
1968 return (0);
1969 }
1970
1971 /*
1972 * Now, decrypt the timestamp using the session key
1973 * and validate it.
1974 */
1975 #ifdef NFSKERB
1976 XXX
1977 #endif
1978
1979 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
1980 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
1981 if (nuidp->nu_expire < time_second ||
1982 nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
1983 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
1984 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
1985 nuidp->nu_expire = 0;
1986 nd->nd_repstat =
1987 (NFSERR_AUTHERR|AUTH_REJECTVERF);
1988 nd->nd_procnum = NFSPROC_NOOP;
1989 return (0);
1990 }
1991 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
1992 nd->nd_flag |= ND_KERBNICK;
1993 };
1994 } else {
1995 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
1996 nd->nd_procnum = NFSPROC_NOOP;
1997 return (0);
1998 }
1999
2000 nd->nd_md = md;
2001 nd->nd_dpos = dpos;
2002 return (0);
2003 nfsmout:
2004 return (error);
2005 }
2006
2007 #endif
2008
2009 /*
2010 * Send a message to the originating process's terminal. The thread and/or
2011 * process may be NULL. YYY the thread should not be NULL but there may
2012 * still be some uio_td's that are still being passed as NULL through to
2013 * nfsm_request().
2014 */
2015 static int
2016 nfs_msg(struct thread *td, char *server, char *msg)
2017 {
2018 tpr_t tpr;
2019
2020 if (td && td->td_proc)
2021 tpr = tprintf_open(td->td_proc);
2022 else
2023 tpr = NULL;
2024 tprintf(tpr, "nfs server %s: %s\n", server, msg);
2025 tprintf_close(tpr);
2026 return (0);
2027 }
2028
2029 #ifndef NFS_NOSERVER
2030 /*
2031 * Socket upcall routine for the nfsd sockets.
2032 * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2033 * Essentially do as much as possible non-blocking, else punt and it will
2034 * be called with MB_WAIT from an nfsd.
2035 */
2036 void
2037 nfsrv_rcv(struct socket *so, void *arg, int waitflag)
2038 {
2039 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2040 struct mbuf *m;
2041 struct sockaddr *nam;
2042 struct sockbuf sio;
2043 int flags, error;
2044 int nparallel_wakeup = 0;
2045
2046 if ((slp->ns_flag & SLP_VALID) == 0)
2047 return;
2048
2049 /*
2050 * Do not allow an infinite number of completed RPC records to build
2051 * up before we stop reading data from the socket. Otherwise we could
2052 * end up holding onto an unreasonable number of mbufs for requests
2053 * waiting for service.
2054 *
2055 * This should give pretty good feedback to the TCP
2056 * layer and prevents a memory crunch for other protocols.
2057 *
2058 * Note that the same service socket can be dispatched to several
2059 * nfs servers simultaniously.
2060 *
2061 * the tcp protocol callback calls us with MB_DONTWAIT.
2062 * nfsd calls us with MB_WAIT (typically).
2063 */
2064 if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) {
2065 slp->ns_flag |= SLP_NEEDQ;
2066 goto dorecs;
2067 }
2068
2069 /*
2070 * Handle protocol specifics to parse an RPC request. We always
2071 * pull from the socket using non-blocking I/O.
2072 */
2073 if (so->so_type == SOCK_STREAM) {
2074 /*
2075 * The data has to be read in an orderly fashion from a TCP
2076 * stream, unlike a UDP socket. It is possible for soreceive
2077 * and/or nfsrv_getstream() to block, so make sure only one
2078 * entity is messing around with the TCP stream at any given
2079 * moment. The receive sockbuf's lock in soreceive is not
2080 * sufficient.
2081 *
2082 * Note that this procedure can be called from any number of
2083 * NFS severs *OR* can be upcalled directly from a TCP
2084 * protocol thread.
2085 */
2086 if (slp->ns_flag & SLP_GETSTREAM) {
2087 slp->ns_flag |= SLP_NEEDQ;
2088 goto dorecs;
2089 }
2090 slp->ns_flag |= SLP_GETSTREAM;
2091
2092 /*
2093 * Do soreceive(). Pull out as much data as possible without
2094 * blocking.
2095 */
2096 sbinit(&sio, 1000000000);
2097 flags = MSG_DONTWAIT;
2098 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags);
2099 if (error || sio.sb_mb == NULL) {
2100 if (error == EWOULDBLOCK)
2101 slp->ns_flag |= SLP_NEEDQ;
2102 else
2103 slp->ns_flag |= SLP_DISCONN;
2104 slp->ns_flag &= ~SLP_GETSTREAM;
2105 goto dorecs;
2106 }
2107 m = sio.sb_mb;
2108 if (slp->ns_rawend) {
2109 slp->ns_rawend->m_next = m;
2110 slp->ns_cc += sio.sb_cc;
2111 } else {
2112 slp->ns_raw = m;
2113 slp->ns_cc = sio.sb_cc;
2114 }
2115 while (m->m_next)
2116 m = m->m_next;
2117 slp->ns_rawend = m;
2118
2119 /*
2120 * Now try and parse as many record(s) as we can out of the
2121 * raw stream data.
2122 */
2123 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup);
2124 if (error) {
2125 if (error == EPERM)
2126 slp->ns_flag |= SLP_DISCONN;
2127 else
2128 slp->ns_flag |= SLP_NEEDQ;
2129 }
2130 slp->ns_flag &= ~SLP_GETSTREAM;
2131 } else {
2132 /*
2133 * For UDP soreceive typically pulls just one packet, loop
2134 * to get the whole batch.
2135 */
2136 do {
2137 sbinit(&sio, 1000000000);
2138 flags = MSG_DONTWAIT;
2139 error = so_pru_soreceive(so, &nam, NULL, &sio,
2140 NULL, &flags);
2141 if (sio.sb_mb) {
2142 struct nfsrv_rec *rec;
2143 int mf = (waitflag & MB_DONTWAIT) ?
2144 M_NOWAIT : M_WAITOK;
2145 rec = kmalloc(sizeof(struct nfsrv_rec),
2146 M_NFSRVDESC, mf);
2147 if (!rec) {
2148 if (nam)
2149 FREE(nam, M_SONAME);
2150 m_freem(sio.sb_mb);
2151 continue;
2152 }
2153 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED);
2154 rec->nr_address = nam;
2155 rec->nr_packet = sio.sb_mb;
2156 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2157 ++slp->ns_numrec;
2158 ++nparallel_wakeup;
2159 }
2160 if (error) {
2161 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2162 && error != EWOULDBLOCK) {
2163 slp->ns_flag |= SLP_DISCONN;
2164 goto dorecs;
2165 }
2166 }
2167 } while (sio.sb_mb);
2168 }
2169
2170 /*
2171 * If we were upcalled from the tcp protocol layer and we have
2172 * fully parsed records ready to go, or there is new data pending,
2173 * or something went wrong, try to wake up an nfsd thread to deal
2174 * with it.
2175 */
2176 dorecs:
2177 if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0
2178 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) {
2179 nfsrv_wakenfsd(slp, nparallel_wakeup);
2180 }
2181 }
2182
2183 /*
2184 * Try and extract an RPC request from the mbuf data list received on a
2185 * stream socket. The "waitflag" argument indicates whether or not it
2186 * can sleep.
2187 */
2188 static int
2189 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp)
2190 {
2191 struct mbuf *m, **mpp;
2192 char *cp1, *cp2;
2193 int len;
2194 struct mbuf *om, *m2, *recm;
2195 u_int32_t recmark;
2196
2197 for (;;) {
2198 if (slp->ns_reclen == 0) {
2199 if (slp->ns_cc < NFSX_UNSIGNED)
2200 return (0);
2201 m = slp->ns_raw;
2202 if (m->m_len >= NFSX_UNSIGNED) {
2203 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2204 m->m_data += NFSX_UNSIGNED;
2205 m->m_len -= NFSX_UNSIGNED;
2206 } else {
2207 cp1 = (caddr_t)&recmark;
2208 cp2 = mtod(m, caddr_t);
2209 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2210 while (m->m_len == 0) {
2211 m = m->m_next;
2212 cp2 = mtod(m, caddr_t);
2213 }
2214 *cp1++ = *cp2++;
2215 m->m_data++;
2216 m->m_len--;
2217 }
2218 }
2219 slp->ns_cc -= NFSX_UNSIGNED;
2220 recmark = ntohl(recmark);
2221 slp->ns_reclen = recmark & ~0x80000000;
2222 if (recmark & 0x80000000)
2223 slp->ns_flag |= SLP_LASTFRAG;
2224 else
2225 slp->ns_flag &= ~SLP_LASTFRAG;
2226 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) {
2227 log(LOG_ERR, "%s (%d) from nfs client\n",
2228 "impossible packet length",
2229 slp->ns_reclen);
2230 return (EPERM);
2231 }
2232 }
2233
2234 /*
2235 * Now get the record part.
2236 *
2237 * Note that slp->ns_reclen may be 0. Linux sometimes
2238 * generates 0-length RPCs
2239 */
2240 recm = NULL;
2241 if (slp->ns_cc == slp->ns_reclen) {
2242 recm = slp->ns_raw;
2243 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
2244 slp->ns_cc = slp->ns_reclen = 0;
2245 } else if (slp->ns_cc > slp->ns_reclen) {
2246 len = 0;
2247 m = slp->ns_raw;
2248 om = (struct mbuf *)0;
2249
2250 while (len < slp->ns_reclen) {
2251 if ((len + m->m_len) > slp->ns_reclen) {
2252 m2 = m_copym(m, 0, slp->ns_reclen - len,
2253 waitflag);
2254 if (m2) {
2255 if (om) {
2256 om->m_next = m2;
2257 recm = slp->ns_raw;
2258 } else
2259 recm = m2;
2260 m->m_data += slp->ns_reclen - len;
2261 m->m_len -= slp->ns_reclen - len;
2262 len = slp->ns_reclen;
2263 } else {
2264 return (EWOULDBLOCK);
2265 }
2266 } else if ((len + m->m_len) == slp->ns_reclen) {
2267 om = m;
2268 len += m->m_len;
2269 m = m->m_next;
2270 recm = slp->ns_raw;
2271 om->m_next = (struct mbuf *)0;
2272 } else {
2273 om = m;
2274 len += m->m_len;
2275 m = m->m_next;
2276 }
2277 }
2278 slp->ns_raw = m;
2279 slp->ns_cc -= len;
2280 slp->ns_reclen = 0;
2281 } else {
2282 return (0);
2283 }
2284
2285 /*
2286 * Accumulate the fragments into a record.
2287 */
2288 mpp = &slp->ns_frag;
2289 while (*mpp)
2290 mpp = &((*mpp)->m_next);
2291 *mpp = recm;
2292 if (slp->ns_flag & SLP_LASTFRAG) {
2293 struct nfsrv_rec *rec;
2294 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK;
2295 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf);
2296 if (!rec) {
2297 m_freem(slp->ns_frag);
2298 } else {
2299 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2300 rec->nr_address = (struct sockaddr *)0;
2301 rec->nr_packet = slp->ns_frag;
2302 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2303 ++slp->ns_numrec;
2304 ++*countp;
2305 }
2306 slp->ns_frag = (struct mbuf *)0;
2307 }
2308 }
2309 }
2310
2311 /*
2312 * Parse an RPC header.
2313 */
2314 int
2315 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd,
2316 struct nfsrv_descript **ndp)
2317 {
2318 struct nfsrv_rec *rec;
2319 struct mbuf *m;
2320 struct sockaddr *nam;
2321 struct nfsrv_descript *nd;
2322 int error;
2323
2324 *ndp = NULL;
2325 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2326 return (ENOBUFS);
2327 rec = STAILQ_FIRST(&slp->ns_rec);
2328 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2329 KKASSERT(slp->ns_numrec > 0);
2330 --slp->ns_numrec;
2331 nam = rec->nr_address;
2332 m = rec->nr_packet;
2333 kfree(rec, M_NFSRVDESC);
2334 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2335 M_NFSRVDESC, M_WAITOK);
2336 nd->nd_md = nd->nd_mrep = m;
2337 nd->nd_nam2 = nam;
2338 nd->nd_dpos = mtod(m, caddr_t);
2339 error = nfs_getreq(nd, nfsd, TRUE);
2340 if (error) {
2341 if (nam) {
2342 FREE(nam, M_SONAME);
2343 }
2344 kfree((caddr_t)nd, M_NFSRVDESC);
2345 return (error);
2346 }
2347 *ndp = nd;
2348 nfsd->nfsd_nd = nd;
2349 return (0);
2350 }
2351
2352 /*
2353 * Try to assign service sockets to nfsd threads based on the number
2354 * of new rpc requests that have been queued on the service socket.
2355 *
2356 * If no nfsd's are available or additonal requests are pending, set the
2357 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for
2358 * the work in the nfssvc_sock list when it is finished processing its
2359 * current work. This flag is only cleared when an nfsd can not find
2360 * any new work to perform.
2361 */
2362 void
2363 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel)
2364 {
2365 struct nfsd *nd;
2366
2367 if ((slp->ns_flag & SLP_VALID) == 0)
2368 return;
2369 if (nparallel <= 1)
2370 nparallel = 1;
2371 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) {
2372 if (nd->nfsd_flag & NFSD_WAITING) {
2373 nd->nfsd_flag &= ~NFSD_WAITING;
2374 if (nd->nfsd_slp)
2375 panic("nfsd wakeup");
2376 slp->ns_sref++;
2377 nd->nfsd_slp = slp;
2378 wakeup((caddr_t)nd);
2379 if (--nparallel == 0)
2380 break;
2381 }
2382 }
2383 if (nparallel) {
2384 slp->ns_flag |= SLP_DOREC;
2385 nfsd_head_flag |= NFSD_CHECKSLP;
2386 }
2387 }
2388 #endif /* NFS_NOSERVER */
DragonFly BSD