A UDP socket is still bound after it is disconnected, so we need to
[dragonfly.git] / sys / vfs / nfs / nfs_socket.c
CommitLineData
984263bc
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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 $
da004c97 38 * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.11 2004/02/10 07:28:41 dillon Exp $
984263bc
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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/protosw.h>
54#include <sys/socket.h>
55#include <sys/socketvar.h>
56#include <sys/syslog.h>
57#include <sys/tprintf.h>
58#include <sys/sysctl.h>
59#include <sys/signalvar.h>
60
61#include <netinet/in.h>
62#include <netinet/tcp.h>
63
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MD
64#include "rpcv2.h"
65#include "nfsproto.h"
66#include "nfs.h"
67#include "xdr_subs.h"
68#include "nfsm_subs.h"
69#include "nfsmount.h"
70#include "nfsnode.h"
71#include "nfsrtt.h"
72#include "nqnfs.h"
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73
74#define TRUE 1
75#define FALSE 0
76
77/*
78 * Estimate rto for an nfs rpc sent via. an unreliable datagram.
79 * Use the mean and mean deviation of rtt for the appropriate type of rpc
80 * for the frequent rpcs and a default for the others.
81 * The justification for doing "other" this way is that these rpcs
82 * happen so infrequently that timer est. would probably be stale.
83 * Also, since many of these rpcs are
84 * non-idempotent, a conservative timeout is desired.
85 * getattr, lookup - A+2D
86 * read, write - A+4D
87 * other - nm_timeo
88 */
89#define NFS_RTO(n, t) \
90 ((t) == 0 ? (n)->nm_timeo : \
91 ((t) < 3 ? \
92 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
93 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
94#define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
95#define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
96/*
97 * External data, mostly RPC constants in XDR form
98 */
99extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers,
100 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr,
101 rpc_auth_kerb;
102extern u_int32_t nfs_prog, nqnfs_prog;
103extern time_t nqnfsstarttime;
104extern struct nfsstats nfsstats;
105extern int nfsv3_procid[NFS_NPROCS];
106extern int nfs_ticks;
107
108/*
109 * Defines which timer to use for the procnum.
110 * 0 - default
111 * 1 - getattr
112 * 2 - lookup
113 * 3 - read
114 * 4 - write
115 */
116static int proct[NFS_NPROCS] = {
117 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0,
118 0, 0, 0,
119};
120
121static int nfs_realign_test;
122static int nfs_realign_count;
123static int nfs_bufpackets = 4;
124
125SYSCTL_DECL(_vfs_nfs);
126
127SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
128SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
129SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, "");
130
131
132/*
133 * There is a congestion window for outstanding rpcs maintained per mount
134 * point. The cwnd size is adjusted in roughly the way that:
135 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of
136 * SIGCOMM '88". ACM, August 1988.
137 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout
138 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd
139 * of rpcs is in progress.
140 * (The sent count and cwnd are scaled for integer arith.)
141 * Variants of "slow start" were tried and were found to be too much of a
142 * performance hit (ave. rtt 3 times larger),
143 * I suspect due to the large rtt that nfs rpcs have.
144 */
145#define NFS_CWNDSCALE 256
146#define NFS_MAXCWND (NFS_CWNDSCALE * 32)
147static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
148int nfsrtton = 0;
149struct nfsrtt nfsrtt;
150struct callout_handle nfs_timer_handle;
151
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152static int nfs_msg (struct thread *,char *,char *);
153static int nfs_rcvlock (struct nfsreq *);
154static void nfs_rcvunlock (struct nfsreq *);
155static void nfs_realign (struct mbuf **pm, int hsiz);
156static int nfs_receive (struct nfsreq *rep, struct sockaddr **aname,
157 struct mbuf **mp);
158static void nfs_softterm (struct nfsreq *rep);
159static int nfs_reconnect (struct nfsreq *rep);
984263bc 160#ifndef NFS_NOSERVER
a6ee311a 161static int nfsrv_getstream (struct nfssvc_sock *,int);
984263bc 162
a6ee311a 163int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
984263bc 164 struct nfssvc_sock *slp,
dadab5e9 165 struct thread *td,
a6ee311a 166 struct mbuf **mreqp) = {
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167 nfsrv_null,
168 nfsrv_getattr,
169 nfsrv_setattr,
170 nfsrv_lookup,
171 nfsrv3_access,
172 nfsrv_readlink,
173 nfsrv_read,
174 nfsrv_write,
175 nfsrv_create,
176 nfsrv_mkdir,
177 nfsrv_symlink,
178 nfsrv_mknod,
179 nfsrv_remove,
180 nfsrv_rmdir,
181 nfsrv_rename,
182 nfsrv_link,
183 nfsrv_readdir,
184 nfsrv_readdirplus,
185 nfsrv_statfs,
186 nfsrv_fsinfo,
187 nfsrv_pathconf,
188 nfsrv_commit,
189 nqnfsrv_getlease,
190 nqnfsrv_vacated,
191 nfsrv_noop,
192 nfsrv_noop
193};
194#endif /* NFS_NOSERVER */
195
196/*
197 * Initialize sockets and congestion for a new NFS connection.
198 * We do not free the sockaddr if error.
199 */
200int
dadab5e9 201nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
984263bc 202{
dadab5e9 203 struct socket *so;
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204 int s, error, rcvreserve, sndreserve;
205 int pktscale;
206 struct sockaddr *saddr;
207 struct sockaddr_in *sin;
dadab5e9 208 struct thread *td = &thread0; /* only used for socreate and sobind */
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209
210 nmp->nm_so = (struct socket *)0;
211 saddr = nmp->nm_nam;
212 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype,
dadab5e9 213 nmp->nm_soproto, td);
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214 if (error)
215 goto bad;
216 so = nmp->nm_so;
217 nmp->nm_soflags = so->so_proto->pr_flags;
218
219 /*
220 * Some servers require that the client port be a reserved port number.
221 */
222 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) {
223 struct sockopt sopt;
224 int ip;
225 struct sockaddr_in ssin;
226
227 bzero(&sopt, sizeof sopt);
228 ip = IP_PORTRANGE_LOW;
229 sopt.sopt_dir = SOPT_SET;
230 sopt.sopt_level = IPPROTO_IP;
231 sopt.sopt_name = IP_PORTRANGE;
232 sopt.sopt_val = (void *)&ip;
233 sopt.sopt_valsize = sizeof(ip);
dadab5e9 234 sopt.sopt_td = NULL;
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235 error = sosetopt(so, &sopt);
236 if (error)
237 goto bad;
238 bzero(&ssin, sizeof ssin);
239 sin = &ssin;
240 sin->sin_len = sizeof (struct sockaddr_in);
241 sin->sin_family = AF_INET;
242 sin->sin_addr.s_addr = INADDR_ANY;
243 sin->sin_port = htons(0);
dadab5e9 244 error = sobind(so, (struct sockaddr *)sin, td);
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245 if (error)
246 goto bad;
247 bzero(&sopt, sizeof sopt);
248 ip = IP_PORTRANGE_DEFAULT;
249 sopt.sopt_dir = SOPT_SET;
250 sopt.sopt_level = IPPROTO_IP;
251 sopt.sopt_name = IP_PORTRANGE;
252 sopt.sopt_val = (void *)&ip;
253 sopt.sopt_valsize = sizeof(ip);
dadab5e9 254 sopt.sopt_td = NULL;
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255 error = sosetopt(so, &sopt);
256 if (error)
257 goto bad;
258 }
259
260 /*
261 * Protocols that do not require connections may be optionally left
262 * unconnected for servers that reply from a port other than NFS_PORT.
263 */
264 if (nmp->nm_flag & NFSMNT_NOCONN) {
265 if (nmp->nm_soflags & PR_CONNREQUIRED) {
266 error = ENOTCONN;
267 goto bad;
268 }
269 } else {
dadab5e9 270 error = soconnect(so, nmp->nm_nam, td);
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271 if (error)
272 goto bad;
273
274 /*
275 * Wait for the connection to complete. Cribbed from the
276 * connect system call but with the wait timing out so
277 * that interruptible mounts don't hang here for a long time.
278 */
279 s = splnet();
280 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
377d4740 281 (void) tsleep((caddr_t)&so->so_timeo, 0,
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282 "nfscon", 2 * hz);
283 if ((so->so_state & SS_ISCONNECTING) &&
284 so->so_error == 0 && rep &&
dadab5e9 285 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
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286 so->so_state &= ~SS_ISCONNECTING;
287 splx(s);
288 goto bad;
289 }
290 }
291 if (so->so_error) {
292 error = so->so_error;
293 so->so_error = 0;
294 splx(s);
295 goto bad;
296 }
297 splx(s);
298 }
299 so->so_rcv.sb_timeo = (5 * hz);
300 so->so_snd.sb_timeo = (5 * hz);
301
302 /*
303 * Get buffer reservation size from sysctl, but impose reasonable
304 * limits.
305 */
306 pktscale = nfs_bufpackets;
307 if (pktscale < 2)
308 pktscale = 2;
309 if (pktscale > 64)
310 pktscale = 64;
311
312 if (nmp->nm_sotype == SOCK_DGRAM) {
313 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
314 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
315 NFS_MAXPKTHDR) * pktscale;
316 } else if (nmp->nm_sotype == SOCK_SEQPACKET) {
317 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale;
318 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) +
319 NFS_MAXPKTHDR) * pktscale;
320 } else {
321 if (nmp->nm_sotype != SOCK_STREAM)
322 panic("nfscon sotype");
323 if (so->so_proto->pr_flags & PR_CONNREQUIRED) {
324 struct sockopt sopt;
325 int val;
326
327 bzero(&sopt, sizeof sopt);
328 sopt.sopt_level = SOL_SOCKET;
329 sopt.sopt_name = SO_KEEPALIVE;
330 sopt.sopt_val = &val;
331 sopt.sopt_valsize = sizeof val;
332 val = 1;
333 sosetopt(so, &sopt);
334 }
335 if (so->so_proto->pr_protocol == IPPROTO_TCP) {
336 struct sockopt sopt;
337 int val;
338
339 bzero(&sopt, sizeof sopt);
340 sopt.sopt_level = IPPROTO_TCP;
341 sopt.sopt_name = TCP_NODELAY;
342 sopt.sopt_val = &val;
343 sopt.sopt_valsize = sizeof val;
344 val = 1;
345 sosetopt(so, &sopt);
346 }
347 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR +
348 sizeof (u_int32_t)) * pktscale;
349 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR +
350 sizeof (u_int32_t)) * pktscale;
351 }
352 error = soreserve(so, sndreserve, rcvreserve);
353 if (error)
354 goto bad;
355 so->so_rcv.sb_flags |= SB_NOINTR;
356 so->so_snd.sb_flags |= SB_NOINTR;
357
358 /* Initialize other non-zero congestion variables */
359 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] =
360 nmp->nm_srtt[3] = (NFS_TIMEO << 3);
361 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] =
362 nmp->nm_sdrtt[3] = 0;
363 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */
364 nmp->nm_sent = 0;
365 nmp->nm_timeouts = 0;
366 return (0);
367
368bad:
369 nfs_disconnect(nmp);
370 return (error);
371}
372
373/*
374 * Reconnect routine:
375 * Called when a connection is broken on a reliable protocol.
376 * - clean up the old socket
377 * - nfs_connect() again
378 * - set R_MUSTRESEND for all outstanding requests on mount point
379 * If this fails the mount point is DEAD!
380 * nb: Must be called with the nfs_sndlock() set on the mount point.
381 */
382static int
383nfs_reconnect(rep)
40393ded 384 struct nfsreq *rep;
984263bc 385{
40393ded
RG
386 struct nfsreq *rp;
387 struct nfsmount *nmp = rep->r_nmp;
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388 int error;
389
390 nfs_disconnect(nmp);
391 while ((error = nfs_connect(nmp, rep)) != 0) {
392 if (error == EINTR || error == ERESTART)
393 return (EINTR);
377d4740 394 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
984263bc
MD
395 }
396
397 /*
398 * Loop through outstanding request list and fix up all requests
399 * on old socket.
400 */
401 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) {
402 if (rp->r_nmp == nmp)
403 rp->r_flags |= R_MUSTRESEND;
404 }
405 return (0);
406}
407
408/*
409 * NFS disconnect. Clean up and unlink.
410 */
411void
412nfs_disconnect(nmp)
40393ded 413 struct nfsmount *nmp;
984263bc 414{
40393ded 415 struct socket *so;
984263bc
MD
416
417 if (nmp->nm_so) {
418 so = nmp->nm_so;
419 nmp->nm_so = (struct socket *)0;
420 soshutdown(so, 2);
421 soclose(so);
422 }
423}
424
425void
426nfs_safedisconnect(nmp)
427 struct nfsmount *nmp;
428{
429 struct nfsreq dummyreq;
430
431 bzero(&dummyreq, sizeof(dummyreq));
432 dummyreq.r_nmp = nmp;
cd990953 433 dummyreq.r_td = NULL;
984263bc
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434 nfs_rcvlock(&dummyreq);
435 nfs_disconnect(nmp);
436 nfs_rcvunlock(&dummyreq);
437}
438
439/*
440 * This is the nfs send routine. For connection based socket types, it
441 * must be called with an nfs_sndlock() on the socket.
442 * "rep == NULL" indicates that it has been called from a server.
443 * For the client side:
444 * - return EINTR if the RPC is terminated, 0 otherwise
445 * - set R_MUSTRESEND if the send fails for any reason
446 * - do any cleanup required by recoverable socket errors (?)
447 * For the server side:
448 * - return EINTR or ERESTART if interrupted by a signal
449 * - return EPIPE if a connection is lost for connection based sockets (TCP...)
450 * - do any cleanup required by recoverable socket errors (?)
451 */
452int
453nfs_send(so, nam, top, rep)
40393ded 454 struct socket *so;
984263bc 455 struct sockaddr *nam;
40393ded 456 struct mbuf *top;
984263bc
MD
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
dadab5e9
MD
485 error = so->so_proto->pr_usrreqs->pru_sosend
486 (so, sendnam, 0, top, 0, flags, curthread /*XXX*/);
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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 */
530static int
dadab5e9 531nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp)
984263bc 532{
40393ded 533 struct socket *so;
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MD
534 struct uio auio;
535 struct iovec aio;
40393ded 536 struct mbuf *m;
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MD
537 struct mbuf *control;
538 u_int32_t len;
539 struct sockaddr **getnam;
540 int error, sotype, rcvflg;
dadab5e9 541 struct thread *td = curthread; /* XXX */
984263bc
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542
543 /*
544 * Set up arguments for soreceive()
545 */
546 *mp = (struct mbuf *)0;
547 *aname = (struct sockaddr *)0;
548 sotype = rep->r_nmp->nm_sotype;
549
550 /*
551 * For reliable protocols, lock against other senders/receivers
552 * in case a reconnect is necessary.
553 * For SOCK_STREAM, first get the Record Mark to find out how much
554 * more there is to get.
555 * We must lock the socket against other receivers
556 * until we have an entire rpc request/reply.
557 */
558 if (sotype != SOCK_DGRAM) {
559 error = nfs_sndlock(rep);
560 if (error)
561 return (error);
562tryagain:
563 /*
564 * Check for fatal errors and resending request.
565 */
566 /*
567 * Ugh: If a reconnect attempt just happened, nm_so
568 * would have changed. NULL indicates a failed
569 * attempt that has essentially shut down this
570 * mount point.
571 */
572 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) {
573 nfs_sndunlock(rep);
574 return (EINTR);
575 }
576 so = rep->r_nmp->nm_so;
577 if (!so) {
578 error = nfs_reconnect(rep);
579 if (error) {
580 nfs_sndunlock(rep);
581 return (error);
582 }
583 goto tryagain;
584 }
585 while (rep->r_flags & R_MUSTRESEND) {
586 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT);
587 nfsstats.rpcretries++;
588 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep);
589 if (error) {
590 if (error == EINTR || error == ERESTART ||
591 (error = nfs_reconnect(rep)) != 0) {
592 nfs_sndunlock(rep);
593 return (error);
594 }
595 goto tryagain;
596 }
597 }
598 nfs_sndunlock(rep);
599 if (sotype == SOCK_STREAM) {
600 aio.iov_base = (caddr_t) &len;
601 aio.iov_len = sizeof(u_int32_t);
602 auio.uio_iov = &aio;
603 auio.uio_iovcnt = 1;
604 auio.uio_segflg = UIO_SYSSPACE;
605 auio.uio_rw = UIO_READ;
606 auio.uio_offset = 0;
607 auio.uio_resid = sizeof(u_int32_t);
dadab5e9 608 auio.uio_td = td;
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MD
609 do {
610 rcvflg = MSG_WAITALL;
611 error = so->so_proto->pr_usrreqs->pru_soreceive
612 (so, (struct sockaddr **)0, &auio,
613 (struct mbuf **)0, (struct mbuf **)0,
614 &rcvflg);
615 if (error == EWOULDBLOCK && rep) {
616 if (rep->r_flags & R_SOFTTERM)
617 return (EINTR);
618 }
619 } while (error == EWOULDBLOCK);
620 if (!error && auio.uio_resid > 0) {
621 /*
622 * Don't log a 0 byte receive; it means
623 * that the socket has been closed, and
624 * can happen during normal operation
625 * (forcible unmount or Solaris server).
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 auio.uio_resid = len;
651 do {
652 rcvflg = MSG_WAITALL;
653 error = so->so_proto->pr_usrreqs->pru_soreceive
654 (so, (struct sockaddr **)0,
655 &auio, mp, (struct mbuf **)0, &rcvflg);
656 } while (error == EWOULDBLOCK || error == EINTR ||
657 error == ERESTART);
658 if (!error && auio.uio_resid > 0) {
659 if (len != auio.uio_resid)
660 log(LOG_INFO,
661 "short receive (%d/%d) from nfs server %s\n",
662 len - auio.uio_resid, len,
663 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
664 error = EPIPE;
665 }
666 } else {
667 /*
668 * NB: Since uio_resid is big, MSG_WAITALL is ignored
669 * and soreceive() will return when it has either a
670 * control msg or a data msg.
671 * We have no use for control msg., but must grab them
672 * and then throw them away so we know what is going
673 * on.
674 */
675 auio.uio_resid = len = 100000000; /* Anything Big */
dadab5e9 676 auio.uio_td = td;
984263bc
MD
677 do {
678 rcvflg = 0;
679 error = so->so_proto->pr_usrreqs->pru_soreceive
680 (so, (struct sockaddr **)0,
681 &auio, mp, &control, &rcvflg);
682 if (control)
683 m_freem(control);
684 if (error == EWOULDBLOCK && rep) {
685 if (rep->r_flags & R_SOFTTERM)
686 return (EINTR);
687 }
688 } while (error == EWOULDBLOCK ||
689 (!error && *mp == NULL && control));
690 if ((rcvflg & MSG_EOR) == 0)
691 printf("Egad!!\n");
692 if (!error && *mp == NULL)
693 error = EPIPE;
694 len -= auio.uio_resid;
695 }
696errout:
697 if (error && error != EINTR && error != ERESTART) {
698 m_freem(*mp);
699 *mp = (struct mbuf *)0;
700 if (error != EPIPE)
701 log(LOG_INFO,
702 "receive error %d from nfs server %s\n",
703 error,
704 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
705 error = nfs_sndlock(rep);
706 if (!error) {
707 error = nfs_reconnect(rep);
708 if (!error)
709 goto tryagain;
710 else
711 nfs_sndunlock(rep);
712 }
713 }
714 } else {
715 if ((so = rep->r_nmp->nm_so) == NULL)
716 return (EACCES);
717 if (so->so_state & SS_ISCONNECTED)
718 getnam = (struct sockaddr **)0;
719 else
720 getnam = aname;
721 auio.uio_resid = len = 1000000;
dadab5e9 722 auio.uio_td = td;
984263bc
MD
723 do {
724 rcvflg = 0;
725 error = so->so_proto->pr_usrreqs->pru_soreceive
726 (so, getnam, &auio, mp,
727 (struct mbuf **)0, &rcvflg);
728 if (error == EWOULDBLOCK &&
729 (rep->r_flags & R_SOFTTERM))
730 return (EINTR);
731 } while (error == EWOULDBLOCK);
732 len -= auio.uio_resid;
733 }
734 if (error) {
735 m_freem(*mp);
736 *mp = (struct mbuf *)0;
737 }
738 /*
739 * Search for any mbufs that are not a multiple of 4 bytes long
740 * or with m_data not longword aligned.
741 * These could cause pointer alignment problems, so copy them to
742 * well aligned mbufs.
743 */
744 nfs_realign(mp, 5 * NFSX_UNSIGNED);
745 return (error);
746}
747
748/*
749 * Implement receipt of reply on a socket.
750 * We must search through the list of received datagrams matching them
751 * with outstanding requests using the xid, until ours is found.
752 */
753/* ARGSUSED */
754int
755nfs_reply(myrep)
756 struct nfsreq *myrep;
757{
40393ded
RG
758 struct nfsreq *rep;
759 struct nfsmount *nmp = myrep->r_nmp;
760 int32_t t1;
984263bc
MD
761 struct mbuf *mrep, *md;
762 struct sockaddr *nam;
763 u_int32_t rxid, *tl;
764 caddr_t dpos, cp2;
765 int error;
766
767 /*
768 * Loop around until we get our own reply
769 */
770 for (;;) {
771 /*
772 * Lock against other receivers so that I don't get stuck in
773 * sbwait() after someone else has received my reply for me.
774 * Also necessary for connection based protocols to avoid
775 * race conditions during a reconnect.
776 * If nfs_rcvlock() returns EALREADY, that means that
777 * the reply has already been recieved by another
778 * process and we can return immediately. In this
779 * case, the lock is not taken to avoid races with
780 * other processes.
781 */
782 error = nfs_rcvlock(myrep);
783 if (error == EALREADY)
784 return (0);
785 if (error)
786 return (error);
787 /*
788 * Get the next Rpc reply off the socket
789 */
790 error = nfs_receive(myrep, &nam, &mrep);
791 nfs_rcvunlock(myrep);
792 if (error) {
793
794 /*
795 * Ignore routing errors on connectionless protocols??
796 */
797 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
798 nmp->nm_so->so_error = 0;
799 if (myrep->r_flags & R_GETONEREP)
800 return (0);
801 continue;
802 }
803 return (error);
804 }
805 if (nam)
806 FREE(nam, M_SONAME);
807
808 /*
809 * Get the xid and check that it is an rpc reply
810 */
811 md = mrep;
812 dpos = mtod(md, caddr_t);
813 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED);
814 rxid = *tl++;
815 if (*tl != rpc_reply) {
816#ifndef NFS_NOSERVER
817 if (nmp->nm_flag & NFSMNT_NQNFS) {
818 if (nqnfs_callback(nmp, mrep, md, dpos))
819 nfsstats.rpcinvalid++;
820 } else {
821 nfsstats.rpcinvalid++;
822 m_freem(mrep);
823 }
824#else
825 nfsstats.rpcinvalid++;
826 m_freem(mrep);
827#endif
828nfsmout:
829 if (myrep->r_flags & R_GETONEREP)
830 return (0);
831 continue;
832 }
833
834 /*
835 * Loop through the request list to match up the reply
836 * Iff no match, just drop the datagram
837 */
838 for (rep = nfs_reqq.tqh_first; rep != 0;
839 rep = rep->r_chain.tqe_next) {
840 if (rep->r_mrep == NULL && rxid == rep->r_xid) {
841 /* Found it.. */
842 rep->r_mrep = mrep;
843 rep->r_md = md;
844 rep->r_dpos = dpos;
845 if (nfsrtton) {
846 struct rttl *rt;
847
848 rt = &nfsrtt.rttl[nfsrtt.pos];
849 rt->proc = rep->r_procnum;
850 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
851 rt->sent = nmp->nm_sent;
852 rt->cwnd = nmp->nm_cwnd;
853 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
854 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
855 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
856 getmicrotime(&rt->tstamp);
857 if (rep->r_flags & R_TIMING)
858 rt->rtt = rep->r_rtt;
859 else
860 rt->rtt = 1000000;
861 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
862 }
863 /*
864 * Update congestion window.
865 * Do the additive increase of
866 * one rpc/rtt.
867 */
868 if (nmp->nm_cwnd <= nmp->nm_sent) {
869 nmp->nm_cwnd +=
870 (NFS_CWNDSCALE * NFS_CWNDSCALE +
871 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
872 if (nmp->nm_cwnd > NFS_MAXCWND)
873 nmp->nm_cwnd = NFS_MAXCWND;
874 }
875 if (rep->r_flags & R_SENT) {
876 rep->r_flags &= ~R_SENT;
877 nmp->nm_sent -= NFS_CWNDSCALE;
878 }
879 /*
880 * Update rtt using a gain of 0.125 on the mean
881 * and a gain of 0.25 on the deviation.
882 */
883 if (rep->r_flags & R_TIMING) {
884 /*
885 * Since the timer resolution of
886 * NFS_HZ is so course, it can often
887 * result in r_rtt == 0. Since
888 * r_rtt == N means that the actual
889 * rtt is between N+dt and N+2-dt ticks,
890 * add 1.
891 */
892 t1 = rep->r_rtt + 1;
893 t1 -= (NFS_SRTT(rep) >> 3);
894 NFS_SRTT(rep) += t1;
895 if (t1 < 0)
896 t1 = -t1;
897 t1 -= (NFS_SDRTT(rep) >> 2);
898 NFS_SDRTT(rep) += t1;
899 }
900 nmp->nm_timeouts = 0;
901 break;
902 }
903 }
904 /*
905 * If not matched to a request, drop it.
906 * If it's mine, get out.
907 */
908 if (rep == 0) {
909 nfsstats.rpcunexpected++;
910 m_freem(mrep);
911 } else if (rep == myrep) {
912 if (rep->r_mrep == NULL)
913 panic("nfsreply nil");
914 return (0);
915 }
916 if (myrep->r_flags & R_GETONEREP)
917 return (0);
918 }
919}
920
921/*
922 * nfs_request - goes something like this
923 * - fill in request struct
924 * - links it into list
925 * - calls nfs_send() for first transmit
926 * - calls nfs_receive() to get reply
927 * - break down rpc header and return with nfs reply pointed to
928 * by mrep or error
929 * nb: always frees up mreq mbuf list
930 */
931int
dadab5e9 932nfs_request(vp, mrest, procnum, td, cred, mrp, mdp, dposp)
984263bc
MD
933 struct vnode *vp;
934 struct mbuf *mrest;
935 int procnum;
dadab5e9 936 struct thread *td;
984263bc
MD
937 struct ucred *cred;
938 struct mbuf **mrp;
939 struct mbuf **mdp;
940 caddr_t *dposp;
941{
40393ded
RG
942 struct mbuf *mrep, *m2;
943 struct nfsreq *rep;
944 u_int32_t *tl;
945 int i;
984263bc
MD
946 struct nfsmount *nmp;
947 struct mbuf *m, *md, *mheadend;
948 struct nfsnode *np;
949 char nickv[RPCX_NICKVERF];
950 time_t reqtime, waituntil;
951 caddr_t dpos, cp2;
952 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type;
953 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
954 int verf_len, verf_type;
955 u_int32_t xid;
956 u_quad_t frev;
957 char *auth_str, *verf_str;
958 NFSKERBKEY_T key; /* save session key */
959
960 /* Reject requests while attempting a forced unmount. */
961 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) {
962 m_freem(mrest);
963 return (ESTALE);
964 }
965 nmp = VFSTONFS(vp->v_mount);
966 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK);
967 rep->r_nmp = nmp;
968 rep->r_vp = vp;
dadab5e9 969 rep->r_td = td;
984263bc
MD
970 rep->r_procnum = procnum;
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 */
982kerbauth:
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 free((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 free(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, M_WAIT);
1cee5817
HP
1017 if (m == NULL)
1018 return (ENOBUFS);
984263bc
MD
1019 *mtod(m, u_int32_t *) = htonl(0x80000000 |
1020 (m->m_pkthdr.len - NFSX_UNSIGNED));
1021 }
1022 rep->r_mreq = m;
1023 rep->r_xid = xid;
1024tryagain:
1025 if (nmp->nm_flag & NFSMNT_SOFT)
1026 rep->r_retry = nmp->nm_retry;
1027 else
1028 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */
1029 rep->r_rtt = rep->r_rexmit = 0;
1030 if (proct[procnum] > 0)
1031 rep->r_flags = R_TIMING;
1032 else
1033 rep->r_flags = 0;
1034 rep->r_mrep = NULL;
1035
1036 /*
1037 * Do the client side RPC.
1038 */
1039 nfsstats.rpcrequests++;
1040 /*
1041 * Chain request into list of outstanding requests. Be sure
1042 * to put it LAST so timer finds oldest requests first.
1043 */
1044 s = splsoftclock();
1045 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
1046
1047 /* Get send time for nqnfs */
1048 reqtime = time_second;
1049
1050 /*
1051 * If backing off another request or avoiding congestion, don't
1052 * send this one now but let timer do it. If not timing a request,
1053 * do it now.
1054 */
1055 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
1056 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1057 nmp->nm_sent < nmp->nm_cwnd)) {
1058 splx(s);
1059 if (nmp->nm_soflags & PR_CONNREQUIRED)
1060 error = nfs_sndlock(rep);
1061 if (!error) {
1062 m2 = m_copym(m, 0, M_COPYALL, M_WAIT);
1063 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1064 if (nmp->nm_soflags & PR_CONNREQUIRED)
1065 nfs_sndunlock(rep);
1066 }
1067 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) {
1068 nmp->nm_sent += NFS_CWNDSCALE;
1069 rep->r_flags |= R_SENT;
1070 }
1071 } else {
1072 splx(s);
1073 rep->r_rtt = -1;
1074 }
1075
1076 /*
1077 * Wait for the reply from our send or the timer's.
1078 */
1079 if (!error || error == EPIPE)
1080 error = nfs_reply(rep);
1081
1082 /*
1083 * RPC done, unlink the request.
1084 */
1085 s = splsoftclock();
1086 TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
1087 splx(s);
1088
1089 /*
1090 * Decrement the outstanding request count.
1091 */
1092 if (rep->r_flags & R_SENT) {
1093 rep->r_flags &= ~R_SENT; /* paranoia */
1094 nmp->nm_sent -= NFS_CWNDSCALE;
1095 }
1096
1097 /*
1098 * If there was a successful reply and a tprintf msg.
1099 * tprintf a response.
1100 */
1101 if (!error && (rep->r_flags & R_TPRINTFMSG))
dadab5e9 1102 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
984263bc
MD
1103 "is alive again");
1104 mrep = rep->r_mrep;
1105 md = rep->r_md;
1106 dpos = rep->r_dpos;
1107 if (error) {
1108 m_freem(rep->r_mreq);
1109 free((caddr_t)rep, M_NFSREQ);
1110 return (error);
1111 }
1112
1113 /*
1114 * break down the rpc header and check if ok
1115 */
1116 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1117 if (*tl++ == rpc_msgdenied) {
1118 if (*tl == rpc_mismatch)
1119 error = EOPNOTSUPP;
1120 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1121 if (!failed_auth) {
1122 failed_auth++;
1123 mheadend->m_next = (struct mbuf *)0;
1124 m_freem(mrep);
1125 m_freem(rep->r_mreq);
1126 goto kerbauth;
1127 } else
1128 error = EAUTH;
1129 } else
1130 error = EACCES;
1131 m_freem(mrep);
1132 m_freem(rep->r_mreq);
1133 free((caddr_t)rep, M_NFSREQ);
1134 return (error);
1135 }
1136
1137 /*
1138 * Grab any Kerberos verifier, otherwise just throw it away.
1139 */
1140 verf_type = fxdr_unsigned(int, *tl++);
1141 i = fxdr_unsigned(int32_t, *tl);
1142 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1143 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1144 if (error)
1145 goto nfsmout;
1146 } else if (i > 0)
1147 nfsm_adv(nfsm_rndup(i));
1148 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1149 /* 0 == ok */
1150 if (*tl == 0) {
1151 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1152 if (*tl != 0) {
1153 error = fxdr_unsigned(int, *tl);
1154 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1155 error == NFSERR_TRYLATER) {
1156 m_freem(mrep);
1157 error = 0;
1158 waituntil = time_second + trylater_delay;
1159 while (time_second < waituntil)
1160 (void) tsleep((caddr_t)&lbolt,
377d4740 1161 0, "nqnfstry", 0);
984263bc
MD
1162 trylater_delay *= nfs_backoff[trylater_cnt];
1163 if (trylater_cnt < 7)
1164 trylater_cnt++;
1165 goto tryagain;
1166 }
1167
1168 /*
1169 * If the File Handle was stale, invalidate the
1170 * lookup cache, just in case.
1171 */
1172 if (error == ESTALE)
1173 cache_purge(vp);
1174 if (nmp->nm_flag & NFSMNT_NFSV3) {
1175 *mrp = mrep;
1176 *mdp = md;
1177 *dposp = dpos;
1178 error |= NFSERR_RETERR;
1179 } else
1180 m_freem(mrep);
1181 m_freem(rep->r_mreq);
1182 free((caddr_t)rep, M_NFSREQ);
1183 return (error);
1184 }
1185
1186 /*
1187 * For nqnfs, get any lease in reply
1188 */
1189 if (nmp->nm_flag & NFSMNT_NQNFS) {
1190 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1191 if (*tl) {
1192 np = VTONFS(vp);
1193 nqlflag = fxdr_unsigned(int, *tl);
1194 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED);
1195 cachable = fxdr_unsigned(int, *tl++);
1196 reqtime += fxdr_unsigned(int, *tl++);
1197 if (reqtime > time_second) {
1198 frev = fxdr_hyper(tl);
1199 nqnfs_clientlease(nmp, np, nqlflag,
1200 cachable, reqtime, frev);
1201 }
1202 }
1203 }
1204 *mrp = mrep;
1205 *mdp = md;
1206 *dposp = dpos;
1207 m_freem(rep->r_mreq);
1208 FREE((caddr_t)rep, M_NFSREQ);
1209 return (0);
1210 }
1211 m_freem(mrep);
1212 error = EPROTONOSUPPORT;
1213nfsmout:
1214 m_freem(rep->r_mreq);
1215 free((caddr_t)rep, M_NFSREQ);
1216 return (error);
1217}
1218
1219#ifndef NFS_NOSERVER
1220/*
1221 * Generate the rpc reply header
1222 * siz arg. is used to decide if adding a cluster is worthwhile
1223 */
1224int
1225nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp)
1226 int siz;
1227 struct nfsrv_descript *nd;
1228 struct nfssvc_sock *slp;
1229 int err;
1230 int cache;
1231 u_quad_t *frev;
1232 struct mbuf **mrq;
1233 struct mbuf **mbp;
1234 caddr_t *bposp;
1235{
40393ded
RG
1236 u_int32_t *tl;
1237 struct mbuf *mreq;
984263bc
MD
1238 caddr_t bpos;
1239 struct mbuf *mb, *mb2;
1240
1241 MGETHDR(mreq, M_WAIT, MT_DATA);
1242 mb = mreq;
1243 /*
1244 * If this is a big reply, use a cluster else
1245 * try and leave leading space for the lower level headers.
1246 */
1247 siz += RPC_REPLYSIZ;
1248 if ((max_hdr + siz) >= MINCLSIZE) {
1249 MCLGET(mreq, M_WAIT);
1250 } else
1251 mreq->m_data += max_hdr;
1252 tl = mtod(mreq, u_int32_t *);
1253 mreq->m_len = 6 * NFSX_UNSIGNED;
1254 bpos = ((caddr_t)tl) + mreq->m_len;
1255 *tl++ = txdr_unsigned(nd->nd_retxid);
1256 *tl++ = rpc_reply;
1257 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1258 *tl++ = rpc_msgdenied;
1259 if (err & NFSERR_AUTHERR) {
1260 *tl++ = rpc_autherr;
1261 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1262 mreq->m_len -= NFSX_UNSIGNED;
1263 bpos -= NFSX_UNSIGNED;
1264 } else {
1265 *tl++ = rpc_mismatch;
1266 *tl++ = txdr_unsigned(RPC_VER2);
1267 *tl = txdr_unsigned(RPC_VER2);
1268 }
1269 } else {
1270 *tl++ = rpc_msgaccepted;
1271
1272 /*
1273 * For Kerberos authentication, we must send the nickname
1274 * verifier back, otherwise just RPCAUTH_NULL.
1275 */
1276 if (nd->nd_flag & ND_KERBFULL) {
40393ded 1277 struct nfsuid *nuidp;
984263bc
MD
1278 struct timeval ktvin, ktvout;
1279
1280 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1281 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1282 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1283 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1284 &nuidp->nu_haddr, nd->nd_nam2)))
1285 break;
1286 }
1287 if (nuidp) {
1288 ktvin.tv_sec =
1289 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1290 ktvin.tv_usec =
1291 txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1292
1293 /*
1294 * Encrypt the timestamp in ecb mode using the
1295 * session key.
1296 */
1297#ifdef NFSKERB
1298 XXX
1299#endif
1300
1301 *tl++ = rpc_auth_kerb;
1302 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1303 *tl = ktvout.tv_sec;
1304 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1305 *tl++ = ktvout.tv_usec;
1306 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1307 } else {
1308 *tl++ = 0;
1309 *tl++ = 0;
1310 }
1311 } else {
1312 *tl++ = 0;
1313 *tl++ = 0;
1314 }
1315 switch (err) {
1316 case EPROGUNAVAIL:
1317 *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1318 break;
1319 case EPROGMISMATCH:
1320 *tl = txdr_unsigned(RPC_PROGMISMATCH);
1321 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1322 if (nd->nd_flag & ND_NQNFS) {
1323 *tl++ = txdr_unsigned(3);
1324 *tl = txdr_unsigned(3);
1325 } else {
1326 *tl++ = txdr_unsigned(2);
1327 *tl = txdr_unsigned(3);
1328 }
1329 break;
1330 case EPROCUNAVAIL:
1331 *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1332 break;
1333 case EBADRPC:
1334 *tl = txdr_unsigned(RPC_GARBAGE);
1335 break;
1336 default:
1337 *tl = 0;
1338 if (err != NFSERR_RETVOID) {
1339 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1340 if (err)
1341 *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1342 else
1343 *tl = 0;
1344 }
1345 break;
1346 };
1347 }
1348
1349 /*
1350 * For nqnfs, piggyback lease as requested.
1351 */
1352 if ((nd->nd_flag & ND_NQNFS) && err == 0) {
1353 if (nd->nd_flag & ND_LEASE) {
1354 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1355 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE);
1356 *tl++ = txdr_unsigned(cache);
1357 *tl++ = txdr_unsigned(nd->nd_duration);
1358 txdr_hyper(*frev, tl);
1359 } else {
1360 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1361 *tl = 0;
1362 }
1363 }
1364 if (mrq != NULL)
1365 *mrq = mreq;
1366 *mbp = mb;
1367 *bposp = bpos;
1368 if (err != 0 && err != NFSERR_RETVOID)
1369 nfsstats.srvrpc_errs++;
1370 return (0);
1371}
1372
1373
1374#endif /* NFS_NOSERVER */
1375/*
1376 * Nfs timer routine
1377 * Scan the nfsreq list and retranmit any requests that have timed out
1378 * To avoid retransmission attempts on STREAM sockets (in the future) make
1379 * sure to set the r_retry field to 0 (implies nm_retry == 0).
1380 */
1381void
1382nfs_timer(arg)
1383 void *arg; /* never used */
1384{
40393ded
RG
1385 struct nfsreq *rep;
1386 struct mbuf *m;
1387 struct socket *so;
1388 struct nfsmount *nmp;
1389 int timeo;
984263bc
MD
1390 int s, error;
1391#ifndef NFS_NOSERVER
1392 static long lasttime = 0;
40393ded 1393 struct nfssvc_sock *slp;
984263bc
MD
1394 u_quad_t cur_usec;
1395#endif /* NFS_NOSERVER */
dadab5e9 1396 struct thread *td = &thread0; /* XXX for credentials, will break if sleep */
984263bc
MD
1397
1398 s = splnet();
1399 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) {
1400 nmp = rep->r_nmp;
1401 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM))
1402 continue;
dadab5e9 1403 if (nfs_sigintr(nmp, rep, rep->r_td)) {
984263bc
MD
1404 nfs_softterm(rep);
1405 continue;
1406 }
1407 if (rep->r_rtt >= 0) {
1408 rep->r_rtt++;
1409 if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1410 timeo = nmp->nm_timeo;
1411 else
1412 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1413 if (nmp->nm_timeouts > 0)
1414 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1415 if (rep->r_rtt <= timeo)
1416 continue;
1417 if (nmp->nm_timeouts < 8)
1418 nmp->nm_timeouts++;
1419 }
1420 /*
1421 * Check for server not responding
1422 */
1423 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1424 rep->r_rexmit > nmp->nm_deadthresh) {
dadab5e9 1425 nfs_msg(rep->r_td,
984263bc
MD
1426 nmp->nm_mountp->mnt_stat.f_mntfromname,
1427 "not responding");
1428 rep->r_flags |= R_TPRINTFMSG;
1429 }
1430 if (rep->r_rexmit >= rep->r_retry) { /* too many */
1431 nfsstats.rpctimeouts++;
1432 nfs_softterm(rep);
1433 continue;
1434 }
1435 if (nmp->nm_sotype != SOCK_DGRAM) {
1436 if (++rep->r_rexmit > NFS_MAXREXMIT)
1437 rep->r_rexmit = NFS_MAXREXMIT;
1438 continue;
1439 }
1440 if ((so = nmp->nm_so) == NULL)
1441 continue;
1442
1443 /*
1444 * If there is enough space and the window allows..
1445 * Resend it
1446 * Set r_rtt to -1 in case we fail to send it now.
1447 */
1448 rep->r_rtt = -1;
1449 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1450 ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1451 (rep->r_flags & R_SENT) ||
1452 nmp->nm_sent < nmp->nm_cwnd) &&
1453 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){
1454 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
1455 error = (*so->so_proto->pr_usrreqs->pru_send)
1456 (so, 0, m, (struct sockaddr *)0,
dadab5e9 1457 (struct mbuf *)0, td);
984263bc
MD
1458 else
1459 error = (*so->so_proto->pr_usrreqs->pru_send)
1460 (so, 0, m, nmp->nm_nam, (struct mbuf *)0,
dadab5e9 1461 td);
984263bc
MD
1462 if (error) {
1463 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1464 so->so_error = 0;
1465 } else {
1466 /*
1467 * Iff first send, start timing
1468 * else turn timing off, backoff timer
1469 * and divide congestion window by 2.
1470 */
1471 if (rep->r_flags & R_SENT) {
1472 rep->r_flags &= ~R_TIMING;
1473 if (++rep->r_rexmit > NFS_MAXREXMIT)
1474 rep->r_rexmit = NFS_MAXREXMIT;
1475 nmp->nm_cwnd >>= 1;
1476 if (nmp->nm_cwnd < NFS_CWNDSCALE)
1477 nmp->nm_cwnd = NFS_CWNDSCALE;
1478 nfsstats.rpcretries++;
1479 } else {
1480 rep->r_flags |= R_SENT;
1481 nmp->nm_sent += NFS_CWNDSCALE;
1482 }
1483 rep->r_rtt = 0;
1484 }
1485 }
1486 }
1487#ifndef NFS_NOSERVER
1488 /*
1489 * Call the nqnfs server timer once a second to handle leases.
1490 */
1491 if (lasttime != time_second) {
1492 lasttime = time_second;
1493 nqnfs_serverd();
1494 }
1495
1496 /*
1497 * Scan the write gathering queues for writes that need to be
1498 * completed now.
1499 */
1500 cur_usec = nfs_curusec();
1501 for (slp = nfssvc_sockhead.tqh_first; slp != 0;
1502 slp = slp->ns_chain.tqe_next) {
1503 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
1504 nfsrv_wakenfsd(slp);
1505 }
1506#endif /* NFS_NOSERVER */
1507 splx(s);
1508 nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks);
1509}
1510
1511/*
1512 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1513 * wait for all requests to complete. This is used by forced unmounts
1514 * to terminate any outstanding RPCs.
1515 */
1516int
1517nfs_nmcancelreqs(nmp)
1518 struct nfsmount *nmp;
1519{
1520 struct nfsreq *req;
1521 int i, s;
1522
1523 s = splnet();
1524 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1525 if (nmp != req->r_nmp || req->r_mrep != NULL ||
1526 (req->r_flags & R_SOFTTERM))
1527 continue;
1528 nfs_softterm(req);
1529 }
1530 splx(s);
1531
1532 for (i = 0; i < 30; i++) {
1533 s = splnet();
1534 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1535 if (nmp == req->r_nmp)
1536 break;
1537 }
1538 splx(s);
1539 if (req == NULL)
1540 return (0);
377d4740 1541 tsleep(&lbolt, 0, "nfscancel", 0);
984263bc
MD
1542 }
1543 return (EBUSY);
1544}
1545
1546/*
1547 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
1548 * The nm_send count is decremented now to avoid deadlocks when the process in
1549 * soreceive() hasn't yet managed to send its own request.
1550 */
1551
1552static void
1553nfs_softterm(rep)
1554 struct nfsreq *rep;
1555{
1556 rep->r_flags |= R_SOFTTERM;
1557
1558 if (rep->r_flags & R_SENT) {
1559 rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
1560 rep->r_flags &= ~R_SENT;
1561 }
1562}
1563
1564/*
1565 * Test for a termination condition pending on the process.
1566 * This is used for NFSMNT_INT mounts.
1567 */
1568int
dadab5e9 1569nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
984263bc
MD
1570{
1571 sigset_t tmpset;
dadab5e9 1572 struct proc *p;
984263bc
MD
1573
1574 if (rep && (rep->r_flags & R_SOFTTERM))
1575 return (EINTR);
1576 /* Terminate all requests while attempting a forced unmount. */
1577 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1578 return (EINTR);
1579 if (!(nmp->nm_flag & NFSMNT_INT))
1580 return (0);
cd990953
MD
1581 /* td might be NULL YYY */
1582 if (td == NULL || (p = td->td_proc) == NULL)
984263bc
MD
1583 return (0);
1584
1585 tmpset = p->p_siglist;
1586 SIGSETNAND(tmpset, p->p_sigmask);
1587 SIGSETNAND(tmpset, p->p_sigignore);
1588 if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset))
1589 return (EINTR);
1590
1591 return (0);
1592}
1593
1594/*
1595 * Lock a socket against others.
1596 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
1597 * and also to avoid race conditions between the processes with nfs requests
1598 * in progress when a reconnect is necessary.
1599 */
1600int
dadab5e9 1601nfs_sndlock(struct nfsreq *rep)
984263bc 1602{
dadab5e9
MD
1603 int *statep = &rep->r_nmp->nm_state;
1604 struct thread *td;
984263bc
MD
1605 int slpflag = 0, slptimeo = 0;
1606
dadab5e9 1607 td = rep->r_td;
984263bc
MD
1608 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1609 slpflag = PCATCH;
1610 while (*statep & NFSSTA_SNDLOCK) {
dadab5e9 1611 if (nfs_sigintr(rep->r_nmp, rep, td))
984263bc
MD
1612 return (EINTR);
1613 *statep |= NFSSTA_WANTSND;
377d4740 1614 (void) tsleep((caddr_t)statep, slpflag,
984263bc
MD
1615 "nfsndlck", slptimeo);
1616 if (slpflag == PCATCH) {
1617 slpflag = 0;
1618 slptimeo = 2 * hz;
1619 }
1620 }
1621 /* Always fail if our request has been cancelled. */
1622 if ((rep->r_flags & R_SOFTTERM))
1623 return (EINTR);
1624 *statep |= NFSSTA_SNDLOCK;
1625 return (0);
1626}
1627
1628/*
1629 * Unlock the stream socket for others.
1630 */
1631void
1632nfs_sndunlock(rep)
1633 struct nfsreq *rep;
1634{
40393ded 1635 int *statep = &rep->r_nmp->nm_state;
984263bc
MD
1636
1637 if ((*statep & NFSSTA_SNDLOCK) == 0)
1638 panic("nfs sndunlock");
1639 *statep &= ~NFSSTA_SNDLOCK;
1640 if (*statep & NFSSTA_WANTSND) {
1641 *statep &= ~NFSSTA_WANTSND;
1642 wakeup((caddr_t)statep);
1643 }
1644}
1645
1646static int
1647nfs_rcvlock(rep)
40393ded 1648 struct nfsreq *rep;
984263bc 1649{
40393ded 1650 int *statep = &rep->r_nmp->nm_state;
984263bc
MD
1651 int slpflag, slptimeo = 0;
1652
1653 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1654 slpflag = PCATCH;
1655 else
1656 slpflag = 0;
1657 while (*statep & NFSSTA_RCVLOCK) {
dadab5e9 1658 if (nfs_sigintr(rep->r_nmp, rep, rep->r_td))
984263bc
MD
1659 return (EINTR);
1660 *statep |= NFSSTA_WANTRCV;
377d4740 1661 (void) tsleep((caddr_t)statep, slpflag, "nfsrcvlk", slptimeo);
984263bc
MD
1662 /*
1663 * If our reply was recieved while we were sleeping,
1664 * then just return without taking the lock to avoid a
1665 * situation where a single iod could 'capture' the
1666 * recieve lock.
1667 */
1668 if (rep->r_mrep != NULL)
1669 return (EALREADY);
1670 if (slpflag == PCATCH) {
1671 slpflag = 0;
1672 slptimeo = 2 * hz;
1673 }
1674 }
1675 *statep |= NFSSTA_RCVLOCK;
1676 return (0);
1677}
1678
1679/*
1680 * Unlock the stream socket for others.
1681 */
1682static void
1683nfs_rcvunlock(rep)
40393ded 1684 struct nfsreq *rep;
984263bc 1685{
40393ded 1686 int *statep = &rep->r_nmp->nm_state;
984263bc
MD
1687
1688 if ((*statep & NFSSTA_RCVLOCK) == 0)
1689 panic("nfs rcvunlock");
1690 *statep &= ~NFSSTA_RCVLOCK;
1691 if (*statep & NFSSTA_WANTRCV) {
1692 *statep &= ~NFSSTA_WANTRCV;
1693 wakeup((caddr_t)statep);
1694 }
1695}
1696
1697/*
1698 * nfs_realign:
1699 *
1700 * Check for badly aligned mbuf data and realign by copying the unaligned
1701 * portion of the data into a new mbuf chain and freeing the portions
1702 * of the old chain that were replaced.
1703 *
1704 * We cannot simply realign the data within the existing mbuf chain
1705 * because the underlying buffers may contain other rpc commands and
1706 * we cannot afford to overwrite them.
1707 *
1708 * We would prefer to avoid this situation entirely. The situation does
1709 * not occur with NFS/UDP and is supposed to only occassionally occur
1710 * with TCP. Use vfs.nfs.realign_count and realign_test to check this.
1711 */
1712static void
1713nfs_realign(pm, hsiz)
40393ded 1714 struct mbuf **pm;
984263bc
MD
1715 int hsiz;
1716{
1717 struct mbuf *m;
1718 struct mbuf *n = NULL;
1719 int off = 0;
1720
1721 ++nfs_realign_test;
1722
1723 while ((m = *pm) != NULL) {
1724 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
1725 MGET(n, M_WAIT, MT_DATA);
1726 if (m->m_len >= MINCLSIZE) {
1727 MCLGET(n, M_WAIT);
1728 }
1729 n->m_len = 0;
1730 break;
1731 }
1732 pm = &m->m_next;
1733 }
1734
1735 /*
1736 * If n is non-NULL, loop on m copying data, then replace the
1737 * portion of the chain that had to be realigned.
1738 */
1739 if (n != NULL) {
1740 ++nfs_realign_count;
1741 while (m) {
1742 m_copyback(n, off, m->m_len, mtod(m, caddr_t));
1743 off += m->m_len;
1744 m = m->m_next;
1745 }
1746 m_freem(*pm);
1747 *pm = n;
1748 }
1749}
1750
1751#ifndef NFS_NOSERVER
1752
1753/*
1754 * Parse an RPC request
1755 * - verify it
1756 * - fill in the cred struct.
1757 */
1758int
1759nfs_getreq(nd, nfsd, has_header)
40393ded 1760 struct nfsrv_descript *nd;
984263bc
MD
1761 struct nfsd *nfsd;
1762 int has_header;
1763{
40393ded
RG
1764 int len, i;
1765 u_int32_t *tl;
1766 int32_t t1;
984263bc
MD
1767 struct uio uio;
1768 struct iovec iov;
1769 caddr_t dpos, cp2, cp;
1770 u_int32_t nfsvers, auth_type;
1771 uid_t nickuid;
1772 int error = 0, nqnfs = 0, ticklen;
1773 struct mbuf *mrep, *md;
40393ded 1774 struct nfsuid *nuidp;
984263bc
MD
1775 struct timeval tvin, tvout;
1776#if 0 /* until encrypted keys are implemented */
1777 NFSKERBKEYSCHED_T keys; /* stores key schedule */
1778#endif
1779
1780 mrep = nd->nd_mrep;
1781 md = nd->nd_md;
1782 dpos = nd->nd_dpos;
1783 if (has_header) {
1784 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED);
1785 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
1786 if (*tl++ != rpc_call) {
1787 m_freem(mrep);
1788 return (EBADRPC);
1789 }
1790 } else
1791 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED);
1792 nd->nd_repstat = 0;
1793 nd->nd_flag = 0;
1794 if (*tl++ != rpc_vers) {
1795 nd->nd_repstat = ERPCMISMATCH;
1796 nd->nd_procnum = NFSPROC_NOOP;
1797 return (0);
1798 }
1799 if (*tl != nfs_prog) {
1800 if (*tl == nqnfs_prog)
1801 nqnfs++;
1802 else {
1803 nd->nd_repstat = EPROGUNAVAIL;
1804 nd->nd_procnum = NFSPROC_NOOP;
1805 return (0);
1806 }
1807 }
1808 tl++;
1809 nfsvers = fxdr_unsigned(u_int32_t, *tl++);
1810 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) ||
1811 (nfsvers != NQNFS_VER3 && nqnfs)) {
1812 nd->nd_repstat = EPROGMISMATCH;
1813 nd->nd_procnum = NFSPROC_NOOP;
1814 return (0);
1815 }
1816 if (nqnfs)
1817 nd->nd_flag = (ND_NFSV3 | ND_NQNFS);
1818 else if (nfsvers == NFS_VER3)
1819 nd->nd_flag = ND_NFSV3;
1820 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
1821 if (nd->nd_procnum == NFSPROC_NULL)
1822 return (0);
1823 if (nd->nd_procnum >= NFS_NPROCS ||
1824 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
1825 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
1826 nd->nd_repstat = EPROCUNAVAIL;
1827 nd->nd_procnum = NFSPROC_NOOP;
1828 return (0);
1829 }
1830 if ((nd->nd_flag & ND_NFSV3) == 0)
1831 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
1832 auth_type = *tl++;
1833 len = fxdr_unsigned(int, *tl++);
1834 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1835 m_freem(mrep);
1836 return (EBADRPC);
1837 }
1838
1839 nd->nd_flag &= ~ND_KERBAUTH;
1840 /*
1841 * Handle auth_unix or auth_kerb.
1842 */
1843 if (auth_type == rpc_auth_unix) {
1844 len = fxdr_unsigned(int, *++tl);
1845 if (len < 0 || len > NFS_MAXNAMLEN) {
1846 m_freem(mrep);
1847 return (EBADRPC);
1848 }
1849 nfsm_adv(nfsm_rndup(len));
1850 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1851 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
1852 nd->nd_cr.cr_ref = 1;
1853 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
1854 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
1855 len = fxdr_unsigned(int, *tl);
1856 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
1857 m_freem(mrep);
1858 return (EBADRPC);
1859 }
1860 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED);
1861 for (i = 1; i <= len; i++)
1862 if (i < NGROUPS)
1863 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
1864 else
1865 tl++;
1866 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
1867 if (nd->nd_cr.cr_ngroups > 1)
1868 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
1869 len = fxdr_unsigned(int, *++tl);
1870 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1871 m_freem(mrep);
1872 return (EBADRPC);
1873 }
1874 if (len > 0)
1875 nfsm_adv(nfsm_rndup(len));
1876 } else if (auth_type == rpc_auth_kerb) {
1877 switch (fxdr_unsigned(int, *tl++)) {
1878 case RPCAKN_FULLNAME:
1879 ticklen = fxdr_unsigned(int, *tl);
1880 *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
1881 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
1882 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
1883 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
1884 m_freem(mrep);
1885 return (EBADRPC);
1886 }
1887 uio.uio_offset = 0;
1888 uio.uio_iov = &iov;
1889 uio.uio_iovcnt = 1;
1890 uio.uio_segflg = UIO_SYSSPACE;
1891 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
1892 iov.iov_len = RPCAUTH_MAXSIZ - 4;
1893 nfsm_mtouio(&uio, uio.uio_resid);
1894 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1895 if (*tl++ != rpc_auth_kerb ||
1896 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
1897 printf("Bad kerb verifier\n");
1898 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1899 nd->nd_procnum = NFSPROC_NOOP;
1900 return (0);
1901 }
1902 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED);
1903 tl = (u_int32_t *)cp;
1904 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
1905 printf("Not fullname kerb verifier\n");
1906 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1907 nd->nd_procnum = NFSPROC_NOOP;
1908 return (0);
1909 }
1910 cp += NFSX_UNSIGNED;
1911 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
1912 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
1913 nd->nd_flag |= ND_KERBFULL;
1914 nfsd->nfsd_flag |= NFSD_NEEDAUTH;
1915 break;
1916 case RPCAKN_NICKNAME:
1917 if (len != 2 * NFSX_UNSIGNED) {
1918 printf("Kerb nickname short\n");
1919 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
1920 nd->nd_procnum = NFSPROC_NOOP;
1921 return (0);
1922 }
1923 nickuid = fxdr_unsigned(uid_t, *tl);
1924 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1925 if (*tl++ != rpc_auth_kerb ||
1926 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
1927 printf("Kerb nick verifier bad\n");
1928 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1929 nd->nd_procnum = NFSPROC_NOOP;
1930 return (0);
1931 }
1932 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1933 tvin.tv_sec = *tl++;
1934 tvin.tv_usec = *tl;
1935
1936 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
1937 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1938 if (nuidp->nu_cr.cr_uid == nickuid &&
1939 (!nd->nd_nam2 ||
1940 netaddr_match(NU_NETFAM(nuidp),
1941 &nuidp->nu_haddr, nd->nd_nam2)))
1942 break;
1943 }
1944 if (!nuidp) {
1945 nd->nd_repstat =
1946 (NFSERR_AUTHERR|AUTH_REJECTCRED);
1947 nd->nd_procnum = NFSPROC_NOOP;
1948 return (0);
1949 }
1950
1951 /*
1952 * Now, decrypt the timestamp using the session key
1953 * and validate it.
1954 */
1955#ifdef NFSKERB
1956 XXX
1957#endif
1958
1959 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
1960 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
1961 if (nuidp->nu_expire < time_second ||
1962 nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
1963 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
1964 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
1965 nuidp->nu_expire = 0;
1966 nd->nd_repstat =
1967 (NFSERR_AUTHERR|AUTH_REJECTVERF);
1968 nd->nd_procnum = NFSPROC_NOOP;
1969 return (0);
1970 }
1971 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
1972 nd->nd_flag |= ND_KERBNICK;
1973 };
1974 } else {
1975 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
1976 nd->nd_procnum = NFSPROC_NOOP;
1977 return (0);
1978 }
1979
1980 /*
1981 * For nqnfs, get piggybacked lease request.
1982 */
1983 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
1984 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1985 nd->nd_flag |= fxdr_unsigned(int, *tl);
1986 if (nd->nd_flag & ND_LEASE) {
1987 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1988 nd->nd_duration = fxdr_unsigned(int32_t, *tl);
1989 } else
1990 nd->nd_duration = NQ_MINLEASE;
1991 } else
1992 nd->nd_duration = NQ_MINLEASE;
1993 nd->nd_md = md;
1994 nd->nd_dpos = dpos;
1995 return (0);
1996nfsmout:
1997 return (error);
1998}
1999
2000#endif
2001
b70ddfbf
MD
2002/*
2003 * Send a message to the originating process's terminal. The thread and/or
2004 * process may be NULL. YYY the thread should not be NULL but there may
2005 * still be some uio_td's that are still being passed as NULL through to
2006 * nfsm_request().
2007 */
984263bc 2008static int
dadab5e9 2009nfs_msg(struct thread *td, char *server, char *msg)
984263bc
MD
2010{
2011 tpr_t tpr;
2012
b70ddfbf 2013 if (td && td->td_proc)
dadab5e9 2014 tpr = tprintf_open(td->td_proc);
984263bc
MD
2015 else
2016 tpr = NULL;
2017 tprintf(tpr, "nfs server %s: %s\n", server, msg);
2018 tprintf_close(tpr);
2019 return (0);
2020}
2021
2022#ifndef NFS_NOSERVER
2023/*
2024 * Socket upcall routine for the nfsd sockets.
2025 * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2026 * Essentially do as much as possible non-blocking, else punt and it will
2027 * be called with M_WAIT from an nfsd.
2028 */
2029void
2030nfsrv_rcv(so, arg, waitflag)
2031 struct socket *so;
2032 void *arg;
2033 int waitflag;
2034{
40393ded
RG
2035 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2036 struct mbuf *m;
984263bc
MD
2037 struct mbuf *mp;
2038 struct sockaddr *nam;
2039 struct uio auio;
2040 int flags, error;
2041
2042 if ((slp->ns_flag & SLP_VALID) == 0)
2043 return;
2044#ifdef notdef
2045 /*
2046 * Define this to test for nfsds handling this under heavy load.
2047 */
2048 if (waitflag == M_DONTWAIT) {
2049 slp->ns_flag |= SLP_NEEDQ; goto dorecs;
2050 }
2051#endif
dadab5e9 2052 auio.uio_td = NULL;
984263bc
MD
2053 if (so->so_type == SOCK_STREAM) {
2054 /*
2055 * If there are already records on the queue, defer soreceive()
2056 * to an nfsd so that there is feedback to the TCP layer that
2057 * the nfs servers are heavily loaded.
2058 */
2059 if (STAILQ_FIRST(&slp->ns_rec) && waitflag == M_DONTWAIT) {
2060 slp->ns_flag |= SLP_NEEDQ;
2061 goto dorecs;
2062 }
2063
2064 /*
2065 * Do soreceive().
2066 */
2067 auio.uio_resid = 1000000000;
2068 flags = MSG_DONTWAIT;
2069 error = so->so_proto->pr_usrreqs->pru_soreceive
2070 (so, &nam, &auio, &mp, (struct mbuf **)0, &flags);
2071 if (error || mp == (struct mbuf *)0) {
2072 if (error == EWOULDBLOCK)
2073 slp->ns_flag |= SLP_NEEDQ;
2074 else
2075 slp->ns_flag |= SLP_DISCONN;
2076 goto dorecs;
2077 }
2078 m = mp;
2079 if (slp->ns_rawend) {
2080 slp->ns_rawend->m_next = m;
2081 slp->ns_cc += 1000000000 - auio.uio_resid;
2082 } else {
2083 slp->ns_raw = m;
2084 slp->ns_cc = 1000000000 - auio.uio_resid;
2085 }
2086 while (m->m_next)
2087 m = m->m_next;
2088 slp->ns_rawend = m;
2089
2090 /*
2091 * Now try and parse record(s) out of the raw stream data.
2092 */
2093 error = nfsrv_getstream(slp, waitflag);
2094 if (error) {
2095 if (error == EPERM)
2096 slp->ns_flag |= SLP_DISCONN;
2097 else
2098 slp->ns_flag |= SLP_NEEDQ;
2099 }
2100 } else {
2101 do {
2102 auio.uio_resid = 1000000000;
2103 flags = MSG_DONTWAIT;
2104 error = so->so_proto->pr_usrreqs->pru_soreceive
2105 (so, &nam, &auio, &mp,
2106 (struct mbuf **)0, &flags);
2107 if (mp) {
2108 struct nfsrv_rec *rec;
da004c97
MD
2109 int mf = (waitflag & M_DONTWAIT) ?
2110 M_NOWAIT : M_WAITOK;
984263bc 2111 rec = malloc(sizeof(struct nfsrv_rec),
da004c97 2112 M_NFSRVDESC, mf);
984263bc
MD
2113 if (!rec) {
2114 if (nam)
2115 FREE(nam, M_SONAME);
2116 m_freem(mp);
2117 continue;
2118 }
2119 nfs_realign(&mp, 10 * NFSX_UNSIGNED);
2120 rec->nr_address = nam;
2121 rec->nr_packet = mp;
2122 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2123 }
2124 if (error) {
2125 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2126 && error != EWOULDBLOCK) {
2127 slp->ns_flag |= SLP_DISCONN;
2128 goto dorecs;
2129 }
2130 }
2131 } while (mp);
2132 }
2133
2134 /*
2135 * Now try and process the request records, non-blocking.
2136 */
2137dorecs:
2138 if (waitflag == M_DONTWAIT &&
2139 (STAILQ_FIRST(&slp->ns_rec)
2140 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN))))
2141 nfsrv_wakenfsd(slp);
2142}
2143
2144/*
2145 * Try and extract an RPC request from the mbuf data list received on a
2146 * stream socket. The "waitflag" argument indicates whether or not it
2147 * can sleep.
2148 */
2149static int
2150nfsrv_getstream(slp, waitflag)
40393ded 2151 struct nfssvc_sock *slp;
984263bc
MD
2152 int waitflag;
2153{
40393ded
RG
2154 struct mbuf *m, **mpp;
2155 char *cp1, *cp2;
2156 int len;
984263bc
MD
2157 struct mbuf *om, *m2, *recm;
2158 u_int32_t recmark;
2159
2160 if (slp->ns_flag & SLP_GETSTREAM)
2161 panic("nfs getstream");
2162 slp->ns_flag |= SLP_GETSTREAM;
2163 for (;;) {
2164 if (slp->ns_reclen == 0) {
2165 if (slp->ns_cc < NFSX_UNSIGNED) {
2166 slp->ns_flag &= ~SLP_GETSTREAM;
2167 return (0);
2168 }
2169 m = slp->ns_raw;
2170 if (m->m_len >= NFSX_UNSIGNED) {
2171 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2172 m->m_data += NFSX_UNSIGNED;
2173 m->m_len -= NFSX_UNSIGNED;
2174 } else {
2175 cp1 = (caddr_t)&recmark;
2176 cp2 = mtod(m, caddr_t);
2177 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2178 while (m->m_len == 0) {
2179 m = m->m_next;
2180 cp2 = mtod(m, caddr_t);
2181 }
2182 *cp1++ = *cp2++;
2183 m->m_data++;
2184 m->m_len--;
2185 }
2186 }
2187 slp->ns_cc -= NFSX_UNSIGNED;
2188 recmark = ntohl(recmark);
2189 slp->ns_reclen = recmark & ~0x80000000;
2190 if (recmark & 0x80000000)
2191 slp->ns_flag |= SLP_LASTFRAG;
2192 else
2193 slp->ns_flag &= ~SLP_LASTFRAG;
2194 if (slp->ns_reclen > NFS_MAXPACKET) {
2195 slp->ns_flag &= ~SLP_GETSTREAM;
2196 return (EPERM);
2197 }
2198 }
2199
2200 /*
2201 * Now get the record part.
2202 *
2203 * Note that slp->ns_reclen may be 0. Linux sometimes
2204 * generates 0-length RPCs
2205 */
2206 recm = NULL;
2207 if (slp->ns_cc == slp->ns_reclen) {
2208 recm = slp->ns_raw;
2209 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
2210 slp->ns_cc = slp->ns_reclen = 0;
2211 } else if (slp->ns_cc > slp->ns_reclen) {
2212 len = 0;
2213 m = slp->ns_raw;
2214 om = (struct mbuf *)0;
2215
2216 while (len < slp->ns_reclen) {
2217 if ((len + m->m_len) > slp->ns_reclen) {
2218 m2 = m_copym(m, 0, slp->ns_reclen - len,
2219 waitflag);
2220 if (m2) {
2221 if (om) {
2222 om->m_next = m2;
2223 recm = slp->ns_raw;
2224 } else
2225 recm = m2;
2226 m->m_data += slp->ns_reclen - len;
2227 m->m_len -= slp->ns_reclen - len;
2228 len = slp->ns_reclen;
2229 } else {
2230 slp->ns_flag &= ~SLP_GETSTREAM;
2231 return (EWOULDBLOCK);
2232 }
2233 } else if ((len + m->m_len) == slp->ns_reclen) {
2234 om = m;
2235 len += m->m_len;
2236 m = m->m_next;
2237 recm = slp->ns_raw;
2238 om->m_next = (struct mbuf *)0;
2239 } else {
2240 om = m;
2241 len += m->m_len;
2242 m = m->m_next;
2243 }
2244 }
2245 slp->ns_raw = m;
2246 slp->ns_cc -= len;
2247 slp->ns_reclen = 0;
2248 } else {
2249 slp->ns_flag &= ~SLP_GETSTREAM;
2250 return (0);
2251 }
2252
2253 /*
2254 * Accumulate the fragments into a record.
2255 */
2256 mpp = &slp->ns_frag;
2257 while (*mpp)
2258 mpp = &((*mpp)->m_next);
2259 *mpp = recm;
2260 if (slp->ns_flag & SLP_LASTFRAG) {
2261 struct nfsrv_rec *rec;
da004c97
MD
2262 int mf = (waitflag & M_DONTWAIT) ? M_NOWAIT : M_WAITOK;
2263 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf);
984263bc
MD
2264 if (!rec) {
2265 m_freem(slp->ns_frag);
2266 } else {
2267 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2268 rec->nr_address = (struct sockaddr *)0;
2269 rec->nr_packet = slp->ns_frag;
2270 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
2271 }
2272 slp->ns_frag = (struct mbuf *)0;
2273 }
2274 }
2275}
2276
2277/*
2278 * Parse an RPC header.
2279 */
2280int
2281nfsrv_dorec(slp, nfsd, ndp)
40393ded 2282 struct nfssvc_sock *slp;
984263bc
MD
2283 struct nfsd *nfsd;
2284 struct nfsrv_descript **ndp;
2285{
2286 struct nfsrv_rec *rec;
40393ded 2287 struct mbuf *m;
984263bc 2288 struct sockaddr *nam;
40393ded 2289 struct nfsrv_descript *nd;
984263bc
MD
2290 int error;
2291
2292 *ndp = NULL;
2293 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2294 return (ENOBUFS);
2295 rec = STAILQ_FIRST(&slp->ns_rec);
2296 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
2297 nam = rec->nr_address;
2298 m = rec->nr_packet;
2299 free(rec, M_NFSRVDESC);
2300 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2301 M_NFSRVDESC, M_WAITOK);
2302 nd->nd_md = nd->nd_mrep = m;
2303 nd->nd_nam2 = nam;
2304 nd->nd_dpos = mtod(m, caddr_t);
2305 error = nfs_getreq(nd, nfsd, TRUE);
2306 if (error) {
2307 if (nam) {
2308 FREE(nam, M_SONAME);
2309 }
2310 free((caddr_t)nd, M_NFSRVDESC);
2311 return (error);
2312 }
2313 *ndp = nd;
2314 nfsd->nfsd_nd = nd;
2315 return (0);
2316}
2317
2318/*
2319 * Search for a sleeping nfsd and wake it up.
2320 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the
2321 * running nfsds will go look for the work in the nfssvc_sock list.
2322 */
2323void
2324nfsrv_wakenfsd(slp)
2325 struct nfssvc_sock *slp;
2326{
40393ded 2327 struct nfsd *nd;
984263bc
MD
2328
2329 if ((slp->ns_flag & SLP_VALID) == 0)
2330 return;
2331 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) {
2332 if (nd->nfsd_flag & NFSD_WAITING) {
2333 nd->nfsd_flag &= ~NFSD_WAITING;
2334 if (nd->nfsd_slp)
2335 panic("nfsd wakeup");
2336 slp->ns_sref++;
2337 nd->nfsd_slp = slp;
2338 wakeup((caddr_t)nd);
2339 return;
2340 }
2341 }
2342 slp->ns_flag |= SLP_DOREC;
2343 nfsd_head_flag |= NFSD_CHECKSLP;
2344}
2345#endif /* NFS_NOSERVER */