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[dragonfly.git] / sys / vfs / nfs / nfs_socket.c
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984263bc
MD
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 $
43884890 38 * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.32 2006/03/01 15:09:35 drhodus Exp $
984263bc
MD
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>
e4700d00 54#include <sys/resourcevar.h>
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55#include <sys/socket.h>
56#include <sys/socketvar.h>
6b6e0885 57#include <sys/socketops.h>
984263bc 58#include <sys/syslog.h>
e4700d00 59#include <sys/thread.h>
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60#include <sys/tprintf.h>
61#include <sys/sysctl.h>
62#include <sys/signalvar.h>
63
64#include <netinet/in.h>
65#include <netinet/tcp.h>
54938b92 66#include <sys/thread2.h>
984263bc 67
1f2de5d4
MD
68#include "rpcv2.h"
69#include "nfsproto.h"
70#include "nfs.h"
71#include "xdr_subs.h"
72#include "nfsm_subs.h"
73#include "nfsmount.h"
74#include "nfsnode.h"
75#include "nfsrtt.h"
76#include "nqnfs.h"
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77
78#define TRUE 1
79#define FALSE 0
80
81/*
82 * Estimate rto for an nfs rpc sent via. an unreliable datagram.
83 * Use the mean and mean deviation of rtt for the appropriate type of rpc
84 * for the frequent rpcs and a default for the others.
85 * The justification for doing "other" this way is that these rpcs
86 * happen so infrequently that timer est. would probably be stale.
87 * Also, since many of these rpcs are
88 * non-idempotent, a conservative timeout is desired.
89 * getattr, lookup - A+2D
90 * read, write - A+4D
91 * other - nm_timeo
92 */
93#define NFS_RTO(n, t) \
94 ((t) == 0 ? (n)->nm_timeo : \
95 ((t) < 3 ? \
96 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \
97 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1)))
98#define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1]
99#define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1]
100/*
101 * External data, mostly RPC constants in XDR form
102 */
103extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers,
104 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr,
105 rpc_auth_kerb;
106extern u_int32_t nfs_prog, nqnfs_prog;
107extern time_t nqnfsstarttime;
108extern struct nfsstats nfsstats;
109extern int nfsv3_procid[NFS_NPROCS];
110extern 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 */
120static 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
125static int nfs_realign_test;
126static int nfs_realign_count;
127static int nfs_bufpackets = 4;
91f46891 128static int nfs_timer_raced;
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129
130SYSCTL_DECL(_vfs_nfs);
131
132SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, "");
133SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, "");
134SYSCTL_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)
152static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, };
153int nfsrtton = 0;
154struct nfsrtt nfsrtt;
f786cc86 155struct callout nfs_timer_handle;
984263bc 156
a6ee311a
RG
157static int nfs_msg (struct thread *,char *,char *);
158static int nfs_rcvlock (struct nfsreq *);
159static void nfs_rcvunlock (struct nfsreq *);
160static void nfs_realign (struct mbuf **pm, int hsiz);
161static int nfs_receive (struct nfsreq *rep, struct sockaddr **aname,
162 struct mbuf **mp);
163static void nfs_softterm (struct nfsreq *rep);
164static int nfs_reconnect (struct nfsreq *rep);
984263bc 165#ifndef NFS_NOSERVER
52553028 166static int nfsrv_getstream (struct nfssvc_sock *, int, int *);
984263bc 167
a6ee311a 168int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd,
984263bc 169 struct nfssvc_sock *slp,
dadab5e9 170 struct thread *td,
a6ee311a 171 struct mbuf **mreqp) = {
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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 nqnfsrv_getlease,
195 nqnfsrv_vacated,
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 */
205int
dadab5e9 206nfs_connect(struct nfsmount *nmp, struct nfsreq *rep)
984263bc 207{
dadab5e9 208 struct socket *so;
165dba55 209 int error, rcvreserve, sndreserve;
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210 int pktscale;
211 struct sockaddr *saddr;
212 struct sockaddr_in *sin;
dadab5e9 213 struct thread *td = &thread0; /* only used for socreate and sobind */
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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,
dadab5e9 218 nmp->nm_soproto, td);
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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;
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234 sopt.sopt_level = IPPROTO_IP;
235 sopt.sopt_name = IP_PORTRANGE;
236 sopt.sopt_val = (void *)&ip;
237 sopt.sopt_valsize = sizeof(ip);
dadab5e9 238 sopt.sopt_td = NULL;
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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);
dadab5e9 248 error = sobind(so, (struct sockaddr *)sin, td);
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249 if (error)
250 goto bad;
251 bzero(&sopt, sizeof sopt);
252 ip = IP_PORTRANGE_DEFAULT;
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253 sopt.sopt_level = IPPROTO_IP;
254 sopt.sopt_name = IP_PORTRANGE;
255 sopt.sopt_val = (void *)&ip;
256 sopt.sopt_valsize = sizeof(ip);
dadab5e9 257 sopt.sopt_td = NULL;
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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 {
dadab5e9 273 error = soconnect(so, nmp->nm_nam, td);
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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 */
165dba55 282 crit_enter();
984263bc 283 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
377d4740 284 (void) tsleep((caddr_t)&so->so_timeo, 0,
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285 "nfscon", 2 * hz);
286 if ((so->so_state & SS_ISCONNECTING) &&
287 so->so_error == 0 && rep &&
dadab5e9 288 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){
984263bc 289 so->so_state &= ~SS_ISCONNECTING;
165dba55 290 crit_exit();
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MD
291 goto bad;
292 }
293 }
294 if (so->so_error) {
295 error = so->so_error;
296 so->so_error = 0;
165dba55 297 crit_exit();
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298 goto bad;
299 }
165dba55 300 crit_exit();
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301 }
302 so->so_rcv.sb_timeo = (5 * hz);
303 so->so_snd.sb_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 }
e4700d00
JH
355 error = soreserve(so, sndreserve, rcvreserve,
356 &td->td_proc->p_rlimit[RLIMIT_SBSIZE]);
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MD
357 if (error)
358 goto bad;
359 so->so_rcv.sb_flags |= SB_NOINTR;
360 so->so_snd.sb_flags |= SB_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
372bad:
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 */
386static int
e851b29e 387nfs_reconnect(struct nfsreq *rep)
984263bc 388{
40393ded
RG
389 struct nfsreq *rp;
390 struct nfsmount *nmp = rep->r_nmp;
984263bc
MD
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);
377d4740 397 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0);
984263bc
MD
398 }
399
400 /*
401 * Loop through outstanding request list and fix up all requests
402 * on old socket.
403 */
91f46891 404 crit_enter();
ecd80f47 405 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) {
984263bc
MD
406 if (rp->r_nmp == nmp)
407 rp->r_flags |= R_MUSTRESEND;
408 }
91f46891 409 crit_exit();
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MD
410 return (0);
411}
412
413/*
414 * NFS disconnect. Clean up and unlink.
415 */
416void
e851b29e 417nfs_disconnect(struct nfsmount *nmp)
984263bc 418{
40393ded 419 struct socket *so;
984263bc
MD
420
421 if (nmp->nm_so) {
422 so = nmp->nm_so;
423 nmp->nm_so = (struct socket *)0;
424 soshutdown(so, 2);
425 soclose(so);
426 }
427}
428
429void
e851b29e 430nfs_safedisconnect(struct nfsmount *nmp)
984263bc
MD
431{
432 struct nfsreq dummyreq;
433
434 bzero(&dummyreq, sizeof(dummyreq));
435 dummyreq.r_nmp = nmp;
cd990953 436 dummyreq.r_td = NULL;
984263bc
MD
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 */
455int
e851b29e
CP
456nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top,
457 struct nfsreq *rep)
984263bc
MD
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
6b6e0885
JH
485 error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags,
486 curthread /*XXX*/);
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MD
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;
984263bc
MD
534 struct uio auio;
535 struct iovec aio;
40393ded 536 struct mbuf *m;
984263bc
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
MD
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) {
74f1caca 586 m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT);
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MD
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;
984263bc
MD
609 do {
610 rcvflg = MSG_WAITALL;
6b6e0885
JH
611 error = so_pru_soreceive(so, NULL, &auio, NULL,
612 NULL, &rcvflg);
984263bc
MD
613 if (error == EWOULDBLOCK && rep) {
614 if (rep->r_flags & R_SOFTTERM)
615 return (EINTR);
616 }
617 } while (error == EWOULDBLOCK);
618 if (!error && auio.uio_resid > 0) {
619 /*
620 * Don't log a 0 byte receive; it means
621 * that the socket has been closed, and
622 * can happen during normal operation
623 * (forcible unmount or Solaris server).
624 */
625 if (auio.uio_resid != sizeof (u_int32_t))
626 log(LOG_INFO,
627 "short receive (%d/%d) from nfs server %s\n",
628 (int)(sizeof(u_int32_t) - auio.uio_resid),
629 (int)sizeof(u_int32_t),
630 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
631 error = EPIPE;
632 }
633 if (error)
634 goto errout;
635 len = ntohl(len) & ~0x80000000;
636 /*
637 * This is SERIOUS! We are out of sync with the sender
638 * and forcing a disconnect/reconnect is all I can do.
639 */
640 if (len > NFS_MAXPACKET) {
641 log(LOG_ERR, "%s (%d) from nfs server %s\n",
642 "impossible packet length",
643 len,
644 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
645 error = EFBIG;
646 goto errout;
647 }
648 auio.uio_resid = len;
649 do {
650 rcvflg = MSG_WAITALL;
6b6e0885
JH
651 error = so_pru_soreceive(so, NULL, &auio, mp,
652 NULL, &rcvflg);
984263bc
MD
653 } while (error == EWOULDBLOCK || error == EINTR ||
654 error == ERESTART);
655 if (!error && auio.uio_resid > 0) {
656 if (len != auio.uio_resid)
657 log(LOG_INFO,
658 "short receive (%d/%d) from nfs server %s\n",
659 len - auio.uio_resid, len,
660 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
661 error = EPIPE;
662 }
663 } else {
664 /*
665 * NB: Since uio_resid is big, MSG_WAITALL is ignored
666 * and soreceive() will return when it has either a
667 * control msg or a data msg.
668 * We have no use for control msg., but must grab them
669 * and then throw them away so we know what is going
670 * on.
671 */
672 auio.uio_resid = len = 100000000; /* Anything Big */
dadab5e9 673 auio.uio_td = td;
984263bc
MD
674 do {
675 rcvflg = 0;
6b6e0885
JH
676 error = so_pru_soreceive(so, NULL, &auio, mp,
677 &control, &rcvflg);
984263bc
MD
678 if (control)
679 m_freem(control);
680 if (error == EWOULDBLOCK && rep) {
681 if (rep->r_flags & R_SOFTTERM)
682 return (EINTR);
683 }
684 } while (error == EWOULDBLOCK ||
685 (!error && *mp == NULL && control));
686 if ((rcvflg & MSG_EOR) == 0)
687 printf("Egad!!\n");
688 if (!error && *mp == NULL)
689 error = EPIPE;
690 len -= auio.uio_resid;
691 }
692errout:
693 if (error && error != EINTR && error != ERESTART) {
694 m_freem(*mp);
695 *mp = (struct mbuf *)0;
696 if (error != EPIPE)
697 log(LOG_INFO,
698 "receive error %d from nfs server %s\n",
699 error,
700 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname);
701 error = nfs_sndlock(rep);
702 if (!error) {
703 error = nfs_reconnect(rep);
704 if (!error)
705 goto tryagain;
706 else
707 nfs_sndunlock(rep);
708 }
709 }
710 } else {
711 if ((so = rep->r_nmp->nm_so) == NULL)
712 return (EACCES);
713 if (so->so_state & SS_ISCONNECTED)
714 getnam = (struct sockaddr **)0;
715 else
716 getnam = aname;
717 auio.uio_resid = len = 1000000;
dadab5e9 718 auio.uio_td = td;
984263bc
MD
719 do {
720 rcvflg = 0;
6b6e0885
JH
721 error = so_pru_soreceive(so, getnam, &auio, mp, NULL,
722 &rcvflg);
984263bc
MD
723 if (error == EWOULDBLOCK &&
724 (rep->r_flags & R_SOFTTERM))
725 return (EINTR);
726 } while (error == EWOULDBLOCK);
727 len -= auio.uio_resid;
728 }
729 if (error) {
730 m_freem(*mp);
731 *mp = (struct mbuf *)0;
732 }
733 /*
734 * Search for any mbufs that are not a multiple of 4 bytes long
735 * or with m_data not longword aligned.
736 * These could cause pointer alignment problems, so copy them to
737 * well aligned mbufs.
738 */
739 nfs_realign(mp, 5 * NFSX_UNSIGNED);
740 return (error);
741}
742
743/*
744 * Implement receipt of reply on a socket.
745 * We must search through the list of received datagrams matching them
746 * with outstanding requests using the xid, until ours is found.
747 */
748/* ARGSUSED */
749int
e851b29e 750nfs_reply(struct nfsreq *myrep)
984263bc 751{
40393ded
RG
752 struct nfsreq *rep;
753 struct nfsmount *nmp = myrep->r_nmp;
754 int32_t t1;
984263bc
MD
755 struct mbuf *mrep, *md;
756 struct sockaddr *nam;
757 u_int32_t rxid, *tl;
758 caddr_t dpos, cp2;
759 int error;
760
761 /*
762 * Loop around until we get our own reply
763 */
764 for (;;) {
765 /*
766 * Lock against other receivers so that I don't get stuck in
767 * sbwait() after someone else has received my reply for me.
768 * Also necessary for connection based protocols to avoid
769 * race conditions during a reconnect.
770 * If nfs_rcvlock() returns EALREADY, that means that
771 * the reply has already been recieved by another
772 * process and we can return immediately. In this
773 * case, the lock is not taken to avoid races with
774 * other processes.
775 */
776 error = nfs_rcvlock(myrep);
777 if (error == EALREADY)
778 return (0);
779 if (error)
780 return (error);
781 /*
782 * Get the next Rpc reply off the socket
783 */
784 error = nfs_receive(myrep, &nam, &mrep);
785 nfs_rcvunlock(myrep);
786 if (error) {
984263bc
MD
787 /*
788 * Ignore routing errors on connectionless protocols??
789 */
790 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) {
791 nmp->nm_so->so_error = 0;
792 if (myrep->r_flags & R_GETONEREP)
793 return (0);
794 continue;
795 }
796 return (error);
797 }
798 if (nam)
799 FREE(nam, M_SONAME);
800
801 /*
802 * Get the xid and check that it is an rpc reply
803 */
804 md = mrep;
805 dpos = mtod(md, caddr_t);
806 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED);
807 rxid = *tl++;
808 if (*tl != rpc_reply) {
809#ifndef NFS_NOSERVER
810 if (nmp->nm_flag & NFSMNT_NQNFS) {
811 if (nqnfs_callback(nmp, mrep, md, dpos))
812 nfsstats.rpcinvalid++;
813 } else {
814 nfsstats.rpcinvalid++;
815 m_freem(mrep);
816 }
817#else
818 nfsstats.rpcinvalid++;
819 m_freem(mrep);
820#endif
821nfsmout:
822 if (myrep->r_flags & R_GETONEREP)
823 return (0);
824 continue;
825 }
826
827 /*
828 * Loop through the request list to match up the reply
91f46891
MD
829 * Iff no match, just drop the datagram. On match, set
830 * r_mrep atomically to prevent the timer from messing
831 * around with the request after we have exited the critical
832 * section.
984263bc 833 */
91f46891 834 crit_enter();
ecd80f47 835 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
984263bc 836 if (rep->r_mrep == NULL && rxid == rep->r_xid) {
984263bc 837 rep->r_mrep = mrep;
91f46891
MD
838 break;
839 }
840 }
841 crit_exit();
842
843 /*
844 * Fill in the rest of the reply if we found a match.
845 */
846 if (rep) {
847 rep->r_md = md;
848 rep->r_dpos = dpos;
849 if (nfsrtton) {
850 struct rttl *rt;
851
852 rt = &nfsrtt.rttl[nfsrtt.pos];
853 rt->proc = rep->r_procnum;
854 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]);
855 rt->sent = nmp->nm_sent;
856 rt->cwnd = nmp->nm_cwnd;
857 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1];
858 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1];
859 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid;
860 getmicrotime(&rt->tstamp);
861 if (rep->r_flags & R_TIMING)
862 rt->rtt = rep->r_rtt;
863 else
864 rt->rtt = 1000000;
865 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ;
866 }
867 /*
868 * Update congestion window.
869 * Do the additive increase of
870 * one rpc/rtt.
871 */
872 if (nmp->nm_cwnd <= nmp->nm_sent) {
873 nmp->nm_cwnd +=
874 (NFS_CWNDSCALE * NFS_CWNDSCALE +
875 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd;
876 if (nmp->nm_cwnd > NFS_MAXCWND)
877 nmp->nm_cwnd = NFS_MAXCWND;
878 }
879 crit_enter(); /* nfs_timer interlock for nm_sent */
880 if (rep->r_flags & R_SENT) {
881 rep->r_flags &= ~R_SENT;
882 nmp->nm_sent -= NFS_CWNDSCALE;
883 }
884 crit_exit();
885 /*
886 * Update rtt using a gain of 0.125 on the mean
887 * and a gain of 0.25 on the deviation.
888 */
889 if (rep->r_flags & R_TIMING) {
984263bc 890 /*
91f46891
MD
891 * Since the timer resolution of
892 * NFS_HZ is so course, it can often
893 * result in r_rtt == 0. Since
894 * r_rtt == N means that the actual
895 * rtt is between N+dt and N+2-dt ticks,
896 * add 1.
984263bc 897 */
91f46891
MD
898 t1 = rep->r_rtt + 1;
899 t1 -= (NFS_SRTT(rep) >> 3);
900 NFS_SRTT(rep) += t1;
901 if (t1 < 0)
902 t1 = -t1;
903 t1 -= (NFS_SDRTT(rep) >> 2);
904 NFS_SDRTT(rep) += t1;
984263bc 905 }
91f46891 906 nmp->nm_timeouts = 0;
984263bc
MD
907 }
908 /*
909 * If not matched to a request, drop it.
910 * If it's mine, get out.
911 */
91f46891 912 if (rep == NULL) {
984263bc
MD
913 nfsstats.rpcunexpected++;
914 m_freem(mrep);
915 } else if (rep == myrep) {
916 if (rep->r_mrep == NULL)
917 panic("nfsreply nil");
918 return (0);
919 }
920 if (myrep->r_flags & R_GETONEREP)
921 return (0);
922 }
923}
924
925/*
926 * nfs_request - goes something like this
927 * - fill in request struct
928 * - links it into list
929 * - calls nfs_send() for first transmit
930 * - calls nfs_receive() to get reply
931 * - break down rpc header and return with nfs reply pointed to
932 * by mrep or error
933 * nb: always frees up mreq mbuf list
934 */
935int
e851b29e
CP
936nfs_request(struct vnode *vp, struct mbuf *mrest, int procnum,
937 struct thread *td, struct ucred *cred, struct mbuf **mrp,
938 struct mbuf **mdp, caddr_t *dposp)
984263bc 939{
40393ded
RG
940 struct mbuf *mrep, *m2;
941 struct nfsreq *rep;
942 u_int32_t *tl;
943 int i;
984263bc
MD
944 struct nfsmount *nmp;
945 struct mbuf *m, *md, *mheadend;
946 struct nfsnode *np;
947 char nickv[RPCX_NICKVERF];
948 time_t reqtime, waituntil;
949 caddr_t dpos, cp2;
165dba55 950 int t1, nqlflag, cachable, error = 0, mrest_len, auth_len, auth_type;
984263bc
MD
951 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0;
952 int verf_len, verf_type;
dc1be39c 953 int retdummy;
984263bc
MD
954 u_int32_t xid;
955 u_quad_t frev;
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;
dadab5e9 968 rep->r_td = td;
984263bc 969 rep->r_procnum = procnum;
91f46891 970 rep->r_mreq = NULL;
984263bc
MD
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) {
74f1caca 1016 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT);
68db5ea4
MD
1017 if (m == NULL) {
1018 free(rep, M_NFSREQ);
1cee5817 1019 return (ENOBUFS);
68db5ea4 1020 }
984263bc
MD
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;
1026tryagain:
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)
54938b92 1033 rep->r_flags = R_TIMING | R_MASKTIMER;
984263bc 1034 else
54938b92 1035 rep->r_flags = R_MASKTIMER;
984263bc
MD
1036 rep->r_mrep = NULL;
1037
1038 /*
1039 * Do the client side RPC.
1040 */
1041 nfsstats.rpcrequests++;
54938b92 1042
984263bc
MD
1043 /*
1044 * Chain request into list of outstanding requests. Be sure
54938b92
MD
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.
984263bc 1050 */
165dba55 1051 crit_enter();
984263bc
MD
1052 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain);
1053
1054 /* Get send time for nqnfs */
1055 reqtime = time_second;
1056
1057 /*
1058 * If backing off another request or avoiding congestion, don't
91f46891
MD
1059 * send this one now but let timer do it. If not timing a request,
1060 * do it now.
1061 *
1062 * Even though the timer will not mess with our request there is
1063 * still the possibility that we will race a reply (which clears
1064 * R_SENT), especially on localhost connections, so be very careful
1065 * when setting R_SENT. We could set R_SENT prior to calling
1066 * nfs_send() but why bother if the response occurs that quickly?
984263bc
MD
1067 */
1068 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM ||
91f46891
MD
1069 (nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1070 nmp->nm_sent < nmp->nm_cwnd)) {
984263bc
MD
1071 if (nmp->nm_soflags & PR_CONNREQUIRED)
1072 error = nfs_sndlock(rep);
1073 if (!error) {
74f1caca 1074 m2 = m_copym(m, 0, M_COPYALL, MB_WAIT);
984263bc
MD
1075 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep);
1076 if (nmp->nm_soflags & PR_CONNREQUIRED)
1077 nfs_sndunlock(rep);
1078 }
91f46891
MD
1079 if (!error && (rep->r_flags & R_MUSTRESEND) == 0 &&
1080 rep->r_mrep == NULL) {
1081 KASSERT((rep->r_flags & R_SENT) == 0,
1082 ("R_SENT ASSERT %p", rep));
984263bc
MD
1083 nmp->nm_sent += NFS_CWNDSCALE;
1084 rep->r_flags |= R_SENT;
1085 }
1086 } else {
984263bc
MD
1087 rep->r_rtt = -1;
1088 }
1089
1090 /*
54938b92
MD
1091 * Let the timer do what it will with the request, then
1092 * wait for the reply from our send or the timer's.
984263bc 1093 */
91f46891
MD
1094 if (!error || error == EPIPE) {
1095 rep->r_flags &= ~R_MASKTIMER;
1096 crit_exit();
984263bc 1097 error = nfs_reply(rep);
91f46891
MD
1098 crit_enter();
1099 }
984263bc
MD
1100
1101 /*
91f46891
MD
1102 * RPC done, unlink the request, but don't rip it out from under
1103 * the callout timer.
984263bc 1104 */
91f46891
MD
1105 while (rep->r_flags & R_LOCKED) {
1106 nfs_timer_raced = 1;
1107 tsleep(&nfs_timer_raced, 0, "nfstrac", 0);
1108 }
984263bc 1109 TAILQ_REMOVE(&nfs_reqq, rep, r_chain);
984263bc
MD
1110
1111 /*
1112 * Decrement the outstanding request count.
1113 */
1114 if (rep->r_flags & R_SENT) {
54938b92 1115 rep->r_flags &= ~R_SENT;
984263bc
MD
1116 nmp->nm_sent -= NFS_CWNDSCALE;
1117 }
165dba55 1118 crit_exit();
984263bc
MD
1119
1120 /*
1121 * If there was a successful reply and a tprintf msg.
1122 * tprintf a response.
1123 */
1124 if (!error && (rep->r_flags & R_TPRINTFMSG))
dadab5e9 1125 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname,
984263bc
MD
1126 "is alive again");
1127 mrep = rep->r_mrep;
1128 md = rep->r_md;
1129 dpos = rep->r_dpos;
1130 if (error) {
1131 m_freem(rep->r_mreq);
1132 free((caddr_t)rep, M_NFSREQ);
1133 return (error);
1134 }
1135
1136 /*
1137 * break down the rpc header and check if ok
1138 */
1139 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1140 if (*tl++ == rpc_msgdenied) {
1141 if (*tl == rpc_mismatch)
1142 error = EOPNOTSUPP;
1143 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) {
1144 if (!failed_auth) {
1145 failed_auth++;
1146 mheadend->m_next = (struct mbuf *)0;
1147 m_freem(mrep);
1148 m_freem(rep->r_mreq);
1149 goto kerbauth;
1150 } else
1151 error = EAUTH;
1152 } else
1153 error = EACCES;
1154 m_freem(mrep);
1155 m_freem(rep->r_mreq);
1156 free((caddr_t)rep, M_NFSREQ);
1157 return (error);
1158 }
1159
1160 /*
1161 * Grab any Kerberos verifier, otherwise just throw it away.
1162 */
1163 verf_type = fxdr_unsigned(int, *tl++);
1164 i = fxdr_unsigned(int32_t, *tl);
1165 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) {
1166 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep);
1167 if (error)
1168 goto nfsmout;
1169 } else if (i > 0)
1170 nfsm_adv(nfsm_rndup(i));
1171 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1172 /* 0 == ok */
1173 if (*tl == 0) {
1174 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1175 if (*tl != 0) {
1176 error = fxdr_unsigned(int, *tl);
1177 if ((nmp->nm_flag & NFSMNT_NFSV3) &&
1178 error == NFSERR_TRYLATER) {
1179 m_freem(mrep);
1180 error = 0;
1181 waituntil = time_second + trylater_delay;
1182 while (time_second < waituntil)
1183 (void) tsleep((caddr_t)&lbolt,
377d4740 1184 0, "nqnfstry", 0);
984263bc
MD
1185 trylater_delay *= nfs_backoff[trylater_cnt];
1186 if (trylater_cnt < 7)
1187 trylater_cnt++;
1188 goto tryagain;
1189 }
1190
1191 /*
1192 * If the File Handle was stale, invalidate the
1193 * lookup cache, just in case.
1194 */
dc1be39c
MD
1195 if (error == ESTALE) {
1196 retdummy = 0;
1197 cache_inval_vp(vp, CINV_CHILDREN, &retdummy);
1198 }
984263bc
MD
1199 if (nmp->nm_flag & NFSMNT_NFSV3) {
1200 *mrp = mrep;
1201 *mdp = md;
1202 *dposp = dpos;
1203 error |= NFSERR_RETERR;
1204 } else
1205 m_freem(mrep);
1206 m_freem(rep->r_mreq);
1207 free((caddr_t)rep, M_NFSREQ);
1208 return (error);
1209 }
1210
1211 /*
1212 * For nqnfs, get any lease in reply
1213 */
1214 if (nmp->nm_flag & NFSMNT_NQNFS) {
1215 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
1216 if (*tl) {
1217 np = VTONFS(vp);
1218 nqlflag = fxdr_unsigned(int, *tl);
1219 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED);
1220 cachable = fxdr_unsigned(int, *tl++);
1221 reqtime += fxdr_unsigned(int, *tl++);
1222 if (reqtime > time_second) {
1223 frev = fxdr_hyper(tl);
1224 nqnfs_clientlease(nmp, np, nqlflag,
1225 cachable, reqtime, frev);
1226 }
1227 }
1228 }
1229 *mrp = mrep;
1230 *mdp = md;
1231 *dposp = dpos;
1232 m_freem(rep->r_mreq);
1233 FREE((caddr_t)rep, M_NFSREQ);
1234 return (0);
1235 }
1236 m_freem(mrep);
1237 error = EPROTONOSUPPORT;
1238nfsmout:
1239 m_freem(rep->r_mreq);
1240 free((caddr_t)rep, M_NFSREQ);
1241 return (error);
1242}
1243
1244#ifndef NFS_NOSERVER
1245/*
1246 * Generate the rpc reply header
1247 * siz arg. is used to decide if adding a cluster is worthwhile
1248 */
1249int
e851b29e
CP
1250nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp,
1251 int err, int cache, u_quad_t *frev, struct mbuf **mrq,
1252 struct mbuf **mbp, caddr_t *bposp)
984263bc 1253{
40393ded
RG
1254 u_int32_t *tl;
1255 struct mbuf *mreq;
984263bc
MD
1256 caddr_t bpos;
1257 struct mbuf *mb, *mb2;
1258
7771277f
JH
1259 siz += RPC_REPLYSIZ;
1260 mb = mreq = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL);
1261 mreq->m_pkthdr.len = 0;
984263bc 1262 /*
7771277f
JH
1263 * If this is not a cluster, try and leave leading space
1264 * for the lower level headers.
984263bc 1265 */
7771277f 1266 if ((max_hdr + siz) < MINCLSIZE)
984263bc
MD
1267 mreq->m_data += max_hdr;
1268 tl = mtod(mreq, u_int32_t *);
1269 mreq->m_len = 6 * NFSX_UNSIGNED;
1270 bpos = ((caddr_t)tl) + mreq->m_len;
1271 *tl++ = txdr_unsigned(nd->nd_retxid);
1272 *tl++ = rpc_reply;
1273 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) {
1274 *tl++ = rpc_msgdenied;
1275 if (err & NFSERR_AUTHERR) {
1276 *tl++ = rpc_autherr;
1277 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR);
1278 mreq->m_len -= NFSX_UNSIGNED;
1279 bpos -= NFSX_UNSIGNED;
1280 } else {
1281 *tl++ = rpc_mismatch;
1282 *tl++ = txdr_unsigned(RPC_VER2);
1283 *tl = txdr_unsigned(RPC_VER2);
1284 }
1285 } else {
1286 *tl++ = rpc_msgaccepted;
1287
1288 /*
1289 * For Kerberos authentication, we must send the nickname
1290 * verifier back, otherwise just RPCAUTH_NULL.
1291 */
1292 if (nd->nd_flag & ND_KERBFULL) {
40393ded 1293 struct nfsuid *nuidp;
984263bc
MD
1294 struct timeval ktvin, ktvout;
1295
1296 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first;
1297 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
1298 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid &&
1299 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp),
1300 &nuidp->nu_haddr, nd->nd_nam2)))
1301 break;
1302 }
1303 if (nuidp) {
1304 ktvin.tv_sec =
1305 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1);
1306 ktvin.tv_usec =
1307 txdr_unsigned(nuidp->nu_timestamp.tv_usec);
1308
1309 /*
1310 * Encrypt the timestamp in ecb mode using the
1311 * session key.
1312 */
1313#ifdef NFSKERB
1314 XXX
1315#endif
1316
1317 *tl++ = rpc_auth_kerb;
1318 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED);
1319 *tl = ktvout.tv_sec;
1320 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1321 *tl++ = ktvout.tv_usec;
1322 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid);
1323 } else {
1324 *tl++ = 0;
1325 *tl++ = 0;
1326 }
1327 } else {
1328 *tl++ = 0;
1329 *tl++ = 0;
1330 }
1331 switch (err) {
1332 case EPROGUNAVAIL:
1333 *tl = txdr_unsigned(RPC_PROGUNAVAIL);
1334 break;
1335 case EPROGMISMATCH:
1336 *tl = txdr_unsigned(RPC_PROGMISMATCH);
1337 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1338 if (nd->nd_flag & ND_NQNFS) {
1339 *tl++ = txdr_unsigned(3);
1340 *tl = txdr_unsigned(3);
1341 } else {
1342 *tl++ = txdr_unsigned(2);
1343 *tl = txdr_unsigned(3);
1344 }
1345 break;
1346 case EPROCUNAVAIL:
1347 *tl = txdr_unsigned(RPC_PROCUNAVAIL);
1348 break;
1349 case EBADRPC:
1350 *tl = txdr_unsigned(RPC_GARBAGE);
1351 break;
1352 default:
1353 *tl = 0;
1354 if (err != NFSERR_RETVOID) {
1355 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1356 if (err)
1357 *tl = txdr_unsigned(nfsrv_errmap(nd, err));
1358 else
1359 *tl = 0;
1360 }
1361 break;
1362 };
1363 }
1364
1365 /*
1366 * For nqnfs, piggyback lease as requested.
1367 */
1368 if ((nd->nd_flag & ND_NQNFS) && err == 0) {
1369 if (nd->nd_flag & ND_LEASE) {
1370 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED);
1371 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE);
1372 *tl++ = txdr_unsigned(cache);
1373 *tl++ = txdr_unsigned(nd->nd_duration);
1374 txdr_hyper(*frev, tl);
1375 } else {
1376 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED);
1377 *tl = 0;
1378 }
1379 }
1380 if (mrq != NULL)
1381 *mrq = mreq;
1382 *mbp = mb;
1383 *bposp = bpos;
1384 if (err != 0 && err != NFSERR_RETVOID)
1385 nfsstats.srvrpc_errs++;
1386 return (0);
1387}
1388
1389
1390#endif /* NFS_NOSERVER */
1391/*
1392 * Nfs timer routine
1393 * Scan the nfsreq list and retranmit any requests that have timed out
1394 * To avoid retransmission attempts on STREAM sockets (in the future) make
1395 * sure to set the r_retry field to 0 (implies nm_retry == 0).
1396 */
1397void
e851b29e 1398nfs_timer(void *arg /* never used */)
984263bc 1399{
40393ded
RG
1400 struct nfsreq *rep;
1401 struct mbuf *m;
1402 struct socket *so;
1403 struct nfsmount *nmp;
1404 int timeo;
165dba55 1405 int error;
984263bc
MD
1406#ifndef NFS_NOSERVER
1407 static long lasttime = 0;
40393ded 1408 struct nfssvc_sock *slp;
984263bc
MD
1409 u_quad_t cur_usec;
1410#endif /* NFS_NOSERVER */
dadab5e9 1411 struct thread *td = &thread0; /* XXX for credentials, will break if sleep */
984263bc 1412
165dba55 1413 crit_enter();
ecd80f47 1414 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) {
984263bc 1415 nmp = rep->r_nmp;
54938b92 1416 if (rep->r_mrep || (rep->r_flags & (R_SOFTTERM|R_MASKTIMER)))
984263bc 1417 continue;
91f46891 1418 rep->r_flags |= R_LOCKED;
dadab5e9 1419 if (nfs_sigintr(nmp, rep, rep->r_td)) {
984263bc 1420 nfs_softterm(rep);
91f46891 1421 goto skip;
984263bc
MD
1422 }
1423 if (rep->r_rtt >= 0) {
1424 rep->r_rtt++;
1425 if (nmp->nm_flag & NFSMNT_DUMBTIMR)
1426 timeo = nmp->nm_timeo;
1427 else
1428 timeo = NFS_RTO(nmp, proct[rep->r_procnum]);
1429 if (nmp->nm_timeouts > 0)
1430 timeo *= nfs_backoff[nmp->nm_timeouts - 1];
1431 if (rep->r_rtt <= timeo)
91f46891 1432 goto skip;
984263bc
MD
1433 if (nmp->nm_timeouts < 8)
1434 nmp->nm_timeouts++;
1435 }
1436 /*
1437 * Check for server not responding
1438 */
1439 if ((rep->r_flags & R_TPRINTFMSG) == 0 &&
1440 rep->r_rexmit > nmp->nm_deadthresh) {
dadab5e9 1441 nfs_msg(rep->r_td,
984263bc
MD
1442 nmp->nm_mountp->mnt_stat.f_mntfromname,
1443 "not responding");
1444 rep->r_flags |= R_TPRINTFMSG;
1445 }
1446 if (rep->r_rexmit >= rep->r_retry) { /* too many */
1447 nfsstats.rpctimeouts++;
1448 nfs_softterm(rep);
91f46891 1449 goto skip;
984263bc
MD
1450 }
1451 if (nmp->nm_sotype != SOCK_DGRAM) {
1452 if (++rep->r_rexmit > NFS_MAXREXMIT)
1453 rep->r_rexmit = NFS_MAXREXMIT;
91f46891 1454 goto skip;
984263bc
MD
1455 }
1456 if ((so = nmp->nm_so) == NULL)
91f46891 1457 goto skip;
984263bc
MD
1458
1459 /*
1460 * If there is enough space and the window allows..
1461 * Resend it
1462 * Set r_rtt to -1 in case we fail to send it now.
1463 */
1464 rep->r_rtt = -1;
1465 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
1466 ((nmp->nm_flag & NFSMNT_DUMBTIMR) ||
1467 (rep->r_flags & R_SENT) ||
1468 nmp->nm_sent < nmp->nm_cwnd) &&
74f1caca 1469 (m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){
984263bc 1470 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0)
6b6e0885 1471 error = so_pru_send(so, 0, m, (struct sockaddr *)0,
dadab5e9 1472 (struct mbuf *)0, td);
984263bc 1473 else
6b6e0885
JH
1474 error = so_pru_send(so, 0, m, nmp->nm_nam,
1475 (struct mbuf *)0, td);
984263bc
MD
1476 if (error) {
1477 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error))
1478 so->so_error = 0;
91f46891 1479 } else if (rep->r_mrep == NULL) {
984263bc
MD
1480 /*
1481 * Iff first send, start timing
1482 * else turn timing off, backoff timer
1483 * and divide congestion window by 2.
91f46891
MD
1484 *
1485 * It is possible for the so_pru_send() to
1486 * block and for us to race a reply so we
1487 * only do this if the reply field has not
1488 * been filled in. R_LOCKED will prevent
1489 * the request from being ripped out from under
1490 * us entirely.
984263bc
MD
1491 */
1492 if (rep->r_flags & R_SENT) {
1493 rep->r_flags &= ~R_TIMING;
1494 if (++rep->r_rexmit > NFS_MAXREXMIT)
1495 rep->r_rexmit = NFS_MAXREXMIT;
1496 nmp->nm_cwnd >>= 1;
1497 if (nmp->nm_cwnd < NFS_CWNDSCALE)
1498 nmp->nm_cwnd = NFS_CWNDSCALE;
1499 nfsstats.rpcretries++;
1500 } else {
1501 rep->r_flags |= R_SENT;
1502 nmp->nm_sent += NFS_CWNDSCALE;
1503 }
1504 rep->r_rtt = 0;
1505 }
1506 }
91f46891
MD
1507skip:
1508 rep->r_flags &= ~R_LOCKED;
984263bc
MD
1509 }
1510#ifndef NFS_NOSERVER
1511 /*
1512 * Call the nqnfs server timer once a second to handle leases.
1513 */
1514 if (lasttime != time_second) {
1515 lasttime = time_second;
1516 nqnfs_serverd();
1517 }
1518
1519 /*
1520 * Scan the write gathering queues for writes that need to be
1521 * completed now.
1522 */
1523 cur_usec = nfs_curusec();
ecd80f47 1524 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) {
984263bc 1525 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec)
52553028 1526 nfsrv_wakenfsd(slp, 1);
984263bc
MD
1527 }
1528#endif /* NFS_NOSERVER */
91f46891
MD
1529
1530 /*
1531 * Due to possible blocking, a client operation may be waiting for
1532 * us to finish processing this request so it can remove it.
1533 */
1534 if (nfs_timer_raced) {
1535 nfs_timer_raced = 0;
1536 wakeup(&nfs_timer_raced);
1537 }
165dba55 1538 crit_exit();
f786cc86 1539 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL);
984263bc
MD
1540}
1541
1542/*
1543 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1544 * wait for all requests to complete. This is used by forced unmounts
1545 * to terminate any outstanding RPCs.
1546 */
1547int
e851b29e 1548nfs_nmcancelreqs(struct nfsmount *nmp)
984263bc
MD
1549{
1550 struct nfsreq *req;
165dba55 1551 int i;
984263bc 1552
165dba55 1553 crit_enter();
984263bc
MD
1554 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1555 if (nmp != req->r_nmp || req->r_mrep != NULL ||
91f46891 1556 (req->r_flags & R_SOFTTERM)) {
984263bc 1557 continue;
91f46891 1558 }
984263bc
MD
1559 nfs_softterm(req);
1560 }
165dba55 1561 crit_exit();
984263bc
MD
1562
1563 for (i = 0; i < 30; i++) {
165dba55 1564 crit_enter();
984263bc
MD
1565 TAILQ_FOREACH(req, &nfs_reqq, r_chain) {
1566 if (nmp == req->r_nmp)
1567 break;
1568 }
165dba55 1569 crit_exit();
984263bc
MD
1570 if (req == NULL)
1571 return (0);
377d4740 1572 tsleep(&lbolt, 0, "nfscancel", 0);
984263bc
MD
1573 }
1574 return (EBUSY);
1575}
1576
1577/*
1578 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT).
1579 * The nm_send count is decremented now to avoid deadlocks when the process in
1580 * soreceive() hasn't yet managed to send its own request.
54938b92
MD
1581 *
1582 * This routine must be called at splsoftclock() to protect r_flags and
1583 * nm_sent.
984263bc
MD
1584 */
1585
1586static void
e851b29e 1587nfs_softterm(struct nfsreq *rep)
984263bc
MD
1588{
1589 rep->r_flags |= R_SOFTTERM;
1590
1591 if (rep->r_flags & R_SENT) {
1592 rep->r_nmp->nm_sent -= NFS_CWNDSCALE;
1593 rep->r_flags &= ~R_SENT;
1594 }
1595}
1596
1597/*
1598 * Test for a termination condition pending on the process.
1599 * This is used for NFSMNT_INT mounts.
1600 */
1601int
dadab5e9 1602nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td)
984263bc
MD
1603{
1604 sigset_t tmpset;
dadab5e9 1605 struct proc *p;
984263bc
MD
1606
1607 if (rep && (rep->r_flags & R_SOFTTERM))
1608 return (EINTR);
1609 /* Terminate all requests while attempting a forced unmount. */
1610 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF)
1611 return (EINTR);
1612 if (!(nmp->nm_flag & NFSMNT_INT))
1613 return (0);
cd990953
MD
1614 /* td might be NULL YYY */
1615 if (td == NULL || (p = td->td_proc) == NULL)
984263bc
MD
1616 return (0);
1617
1618 tmpset = p->p_siglist;
1619 SIGSETNAND(tmpset, p->p_sigmask);
1620 SIGSETNAND(tmpset, p->p_sigignore);
1621 if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset))
1622 return (EINTR);
1623
1624 return (0);
1625}
1626
1627/*
1628 * Lock a socket against others.
1629 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply
1630 * and also to avoid race conditions between the processes with nfs requests
1631 * in progress when a reconnect is necessary.
1632 */
1633int
dadab5e9 1634nfs_sndlock(struct nfsreq *rep)
984263bc 1635{
dadab5e9
MD
1636 int *statep = &rep->r_nmp->nm_state;
1637 struct thread *td;
b2eb81cd
MD
1638 int slptimeo;
1639 int slpflag;
1640 int error;
984263bc 1641
b2eb81cd
MD
1642 slpflag = 0;
1643 slptimeo = 0;
dadab5e9 1644 td = rep->r_td;
984263bc
MD
1645 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1646 slpflag = PCATCH;
b2eb81cd
MD
1647
1648 error = 0;
1649 crit_enter();
984263bc 1650 while (*statep & NFSSTA_SNDLOCK) {
54938b92 1651 *statep |= NFSSTA_WANTSND;
b2eb81cd
MD
1652 if (nfs_sigintr(rep->r_nmp, rep, td)) {
1653 error = EINTR;
1654 break;
1655 }
1656 tsleep((caddr_t)statep, slpflag, "nfsndlck", slptimeo);
984263bc
MD
1657 if (slpflag == PCATCH) {
1658 slpflag = 0;
1659 slptimeo = 2 * hz;
1660 }
1661 }
1662 /* Always fail if our request has been cancelled. */
1663 if ((rep->r_flags & R_SOFTTERM))
b2eb81cd
MD
1664 error = EINTR;
1665 if (error == 0)
1666 *statep |= NFSSTA_SNDLOCK;
1667 crit_exit();
1668 return (error);
984263bc
MD
1669}
1670
1671/*
1672 * Unlock the stream socket for others.
1673 */
1674void
e851b29e 1675nfs_sndunlock(struct nfsreq *rep)
984263bc 1676{
40393ded 1677 int *statep = &rep->r_nmp->nm_state;
984263bc
MD
1678
1679 if ((*statep & NFSSTA_SNDLOCK) == 0)
1680 panic("nfs sndunlock");
b2eb81cd 1681 crit_enter();
984263bc
MD
1682 *statep &= ~NFSSTA_SNDLOCK;
1683 if (*statep & NFSSTA_WANTSND) {
1684 *statep &= ~NFSSTA_WANTSND;
1685 wakeup((caddr_t)statep);
1686 }
b2eb81cd 1687 crit_exit();
984263bc
MD
1688}
1689
1690static int
e851b29e 1691nfs_rcvlock(struct nfsreq *rep)
984263bc 1692{
40393ded 1693 int *statep = &rep->r_nmp->nm_state;
b2eb81cd
MD
1694 int slpflag;
1695 int slptimeo;
1696 int error;
984263bc 1697
54938b92
MD
1698 /*
1699 * Unconditionally check for completion in case another nfsiod
1700 * get the packet while the caller was blocked, before the caller
1701 * called us. Packet reception is handled by mainline code which
1702 * is protected by the BGL at the moment.
b2eb81cd
MD
1703 *
1704 * We do not strictly need the second check just before the
1705 * tsleep(), but it's good defensive programming.
54938b92
MD
1706 */
1707 if (rep->r_mrep != NULL)
1708 return (EALREADY);
1709
984263bc
MD
1710 if (rep->r_nmp->nm_flag & NFSMNT_INT)
1711 slpflag = PCATCH;
1712 else
1713 slpflag = 0;
b2eb81cd
MD
1714 slptimeo = 0;
1715 error = 0;
1716 crit_enter();
984263bc 1717 while (*statep & NFSSTA_RCVLOCK) {
b2eb81cd
MD
1718 if (nfs_sigintr(rep->r_nmp, rep, rep->r_td)) {
1719 error = EINTR;
1720 break;
1721 }
1722 if (rep->r_mrep != NULL) {
1723 error = EALREADY;
1724 break;
1725 }
984263bc 1726 *statep |= NFSSTA_WANTRCV;
b2eb81cd 1727 tsleep((caddr_t)statep, slpflag, "nfsrcvlk", slptimeo);
984263bc
MD
1728 /*
1729 * If our reply was recieved while we were sleeping,
1730 * then just return without taking the lock to avoid a
1731 * situation where a single iod could 'capture' the
1732 * recieve lock.
1733 */
b2eb81cd
MD
1734 if (rep->r_mrep != NULL) {
1735 error = EALREADY;
1736 break;
1737 }
984263bc
MD
1738 if (slpflag == PCATCH) {
1739 slpflag = 0;
1740 slptimeo = 2 * hz;
1741 }
1742 }
b2eb81cd
MD
1743 if (error == 0) {
1744 *statep |= NFSSTA_RCVLOCK;
1745 rep->r_nmp->nm_rcvlock_td = curthread; /* DEBUGGING */
1746 }
1747 crit_exit();
1748 return (error);
984263bc
MD
1749}
1750
1751/*
1752 * Unlock the stream socket for others.
1753 */
1754static void
e851b29e 1755nfs_rcvunlock(struct nfsreq *rep)
984263bc 1756{
40393ded 1757 int *statep = &rep->r_nmp->nm_state;
984263bc
MD
1758
1759 if ((*statep & NFSSTA_RCVLOCK) == 0)
1760 panic("nfs rcvunlock");
b2eb81cd
MD
1761 crit_enter();
1762 rep->r_nmp->nm_rcvlock_td = (void *)-1; /* DEBUGGING */
984263bc
MD
1763 *statep &= ~NFSSTA_RCVLOCK;
1764 if (*statep & NFSSTA_WANTRCV) {
1765 *statep &= ~NFSSTA_WANTRCV;
1766 wakeup((caddr_t)statep);
1767 }
b2eb81cd 1768 crit_exit();
984263bc
MD
1769}
1770
1771/*
1772 * nfs_realign:
1773 *
1774 * Check for badly aligned mbuf data and realign by copying the unaligned
1775 * portion of the data into a new mbuf chain and freeing the portions
1776 * of the old chain that were replaced.
1777 *
1778 * We cannot simply realign the data within the existing mbuf chain
1779 * because the underlying buffers may contain other rpc commands and
1780 * we cannot afford to overwrite them.
1781 *
1782 * We would prefer to avoid this situation entirely. The situation does
1783 * not occur with NFS/UDP and is supposed to only occassionally occur
1784 * with TCP. Use vfs.nfs.realign_count and realign_test to check this.
1785 */
1786static void
e851b29e 1787nfs_realign(struct mbuf **pm, int hsiz)
984263bc
MD
1788{
1789 struct mbuf *m;
1790 struct mbuf *n = NULL;
1791 int off = 0;
1792
1793 ++nfs_realign_test;
1794
1795 while ((m = *pm) != NULL) {
1796 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
50503f0f 1797 n = m_getl(m->m_len, MB_WAIT, MT_DATA, 0, NULL);
984263bc
MD
1798 n->m_len = 0;
1799 break;
1800 }
1801 pm = &m->m_next;
1802 }
1803
1804 /*
1805 * If n is non-NULL, loop on m copying data, then replace the
1806 * portion of the chain that had to be realigned.
1807 */
1808 if (n != NULL) {
1809 ++nfs_realign_count;
1810 while (m) {
1811 m_copyback(n, off, m->m_len, mtod(m, caddr_t));
1812 off += m->m_len;
1813 m = m->m_next;
1814 }
1815 m_freem(*pm);
1816 *pm = n;
1817 }
1818}
1819
1820#ifndef NFS_NOSERVER
1821
1822/*
1823 * Parse an RPC request
1824 * - verify it
1825 * - fill in the cred struct.
1826 */
1827int
e851b29e 1828nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header)
984263bc 1829{
40393ded
RG
1830 int len, i;
1831 u_int32_t *tl;
1832 int32_t t1;
984263bc
MD
1833 struct uio uio;
1834 struct iovec iov;
1835 caddr_t dpos, cp2, cp;
1836 u_int32_t nfsvers, auth_type;
1837 uid_t nickuid;
1838 int error = 0, nqnfs = 0, ticklen;
1839 struct mbuf *mrep, *md;
40393ded 1840 struct nfsuid *nuidp;
984263bc
MD
1841 struct timeval tvin, tvout;
1842#if 0 /* until encrypted keys are implemented */
1843 NFSKERBKEYSCHED_T keys; /* stores key schedule */
1844#endif
1845
1846 mrep = nd->nd_mrep;
1847 md = nd->nd_md;
1848 dpos = nd->nd_dpos;
1849 if (has_header) {
1850 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED);
1851 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++);
1852 if (*tl++ != rpc_call) {
1853 m_freem(mrep);
1854 return (EBADRPC);
1855 }
1856 } else
1857 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED);
1858 nd->nd_repstat = 0;
1859 nd->nd_flag = 0;
1860 if (*tl++ != rpc_vers) {
1861 nd->nd_repstat = ERPCMISMATCH;
1862 nd->nd_procnum = NFSPROC_NOOP;
1863 return (0);
1864 }
1865 if (*tl != nfs_prog) {
1866 if (*tl == nqnfs_prog)
1867 nqnfs++;
1868 else {
1869 nd->nd_repstat = EPROGUNAVAIL;
1870 nd->nd_procnum = NFSPROC_NOOP;
1871 return (0);
1872 }
1873 }
1874 tl++;
1875 nfsvers = fxdr_unsigned(u_int32_t, *tl++);
1876 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) ||
1877 (nfsvers != NQNFS_VER3 && nqnfs)) {
1878 nd->nd_repstat = EPROGMISMATCH;
1879 nd->nd_procnum = NFSPROC_NOOP;
1880 return (0);
1881 }
1882 if (nqnfs)
1883 nd->nd_flag = (ND_NFSV3 | ND_NQNFS);
1884 else if (nfsvers == NFS_VER3)
1885 nd->nd_flag = ND_NFSV3;
1886 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++);
1887 if (nd->nd_procnum == NFSPROC_NULL)
1888 return (0);
1889 if (nd->nd_procnum >= NFS_NPROCS ||
1890 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) ||
1891 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) {
1892 nd->nd_repstat = EPROCUNAVAIL;
1893 nd->nd_procnum = NFSPROC_NOOP;
1894 return (0);
1895 }
1896 if ((nd->nd_flag & ND_NFSV3) == 0)
1897 nd->nd_procnum = nfsv3_procid[nd->nd_procnum];
1898 auth_type = *tl++;
1899 len = fxdr_unsigned(int, *tl++);
1900 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1901 m_freem(mrep);
1902 return (EBADRPC);
1903 }
1904
1905 nd->nd_flag &= ~ND_KERBAUTH;
1906 /*
1907 * Handle auth_unix or auth_kerb.
1908 */
1909 if (auth_type == rpc_auth_unix) {
1910 len = fxdr_unsigned(int, *++tl);
1911 if (len < 0 || len > NFS_MAXNAMLEN) {
1912 m_freem(mrep);
1913 return (EBADRPC);
1914 }
1915 nfsm_adv(nfsm_rndup(len));
1916 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1917 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred));
1918 nd->nd_cr.cr_ref = 1;
1919 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++);
1920 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++);
1921 len = fxdr_unsigned(int, *tl);
1922 if (len < 0 || len > RPCAUTH_UNIXGIDS) {
1923 m_freem(mrep);
1924 return (EBADRPC);
1925 }
1926 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED);
1927 for (i = 1; i <= len; i++)
1928 if (i < NGROUPS)
1929 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++);
1930 else
1931 tl++;
1932 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1);
1933 if (nd->nd_cr.cr_ngroups > 1)
1934 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups);
1935 len = fxdr_unsigned(int, *++tl);
1936 if (len < 0 || len > RPCAUTH_MAXSIZ) {
1937 m_freem(mrep);
1938 return (EBADRPC);
1939 }
1940 if (len > 0)
1941 nfsm_adv(nfsm_rndup(len));
1942 } else if (auth_type == rpc_auth_kerb) {
1943 switch (fxdr_unsigned(int, *tl++)) {
1944 case RPCAKN_FULLNAME:
1945 ticklen = fxdr_unsigned(int, *tl);
1946 *((u_int32_t *)nfsd->nfsd_authstr) = *tl;
1947 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED;
1948 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED;
1949 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) {
1950 m_freem(mrep);
1951 return (EBADRPC);
1952 }
1953 uio.uio_offset = 0;
1954 uio.uio_iov = &iov;
1955 uio.uio_iovcnt = 1;
1956 uio.uio_segflg = UIO_SYSSPACE;
1957 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4];
1958 iov.iov_len = RPCAUTH_MAXSIZ - 4;
1959 nfsm_mtouio(&uio, uio.uio_resid);
1960 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1961 if (*tl++ != rpc_auth_kerb ||
1962 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) {
1963 printf("Bad kerb verifier\n");
1964 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1965 nd->nd_procnum = NFSPROC_NOOP;
1966 return (0);
1967 }
1968 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED);
1969 tl = (u_int32_t *)cp;
1970 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) {
1971 printf("Not fullname kerb verifier\n");
1972 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1973 nd->nd_procnum = NFSPROC_NOOP;
1974 return (0);
1975 }
1976 cp += NFSX_UNSIGNED;
1977 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED);
1978 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED;
1979 nd->nd_flag |= ND_KERBFULL;
1980 nfsd->nfsd_flag |= NFSD_NEEDAUTH;
1981 break;
1982 case RPCAKN_NICKNAME:
1983 if (len != 2 * NFSX_UNSIGNED) {
1984 printf("Kerb nickname short\n");
1985 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED);
1986 nd->nd_procnum = NFSPROC_NOOP;
1987 return (0);
1988 }
1989 nickuid = fxdr_unsigned(uid_t, *tl);
1990 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED);
1991 if (*tl++ != rpc_auth_kerb ||
1992 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) {
1993 printf("Kerb nick verifier bad\n");
1994 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF);
1995 nd->nd_procnum = NFSPROC_NOOP;
1996 return (0);
1997 }
1998 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
1999 tvin.tv_sec = *tl++;
2000 tvin.tv_usec = *tl;
2001
2002 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first;
2003 nuidp != 0; nuidp = nuidp->nu_hash.le_next) {
2004 if (nuidp->nu_cr.cr_uid == nickuid &&
2005 (!nd->nd_nam2 ||
2006 netaddr_match(NU_NETFAM(nuidp),
2007 &nuidp->nu_haddr, nd->nd_nam2)))
2008 break;
2009 }
2010 if (!nuidp) {
2011 nd->nd_repstat =
2012 (NFSERR_AUTHERR|AUTH_REJECTCRED);
2013 nd->nd_procnum = NFSPROC_NOOP;
2014 return (0);
2015 }
2016
2017 /*
2018 * Now, decrypt the timestamp using the session key
2019 * and validate it.
2020 */
2021#ifdef NFSKERB
2022 XXX
2023#endif
2024
2025 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec);
2026 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec);
2027 if (nuidp->nu_expire < time_second ||
2028 nuidp->nu_timestamp.tv_sec > tvout.tv_sec ||
2029 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec &&
2030 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) {
2031 nuidp->nu_expire = 0;
2032 nd->nd_repstat =
2033 (NFSERR_AUTHERR|AUTH_REJECTVERF);
2034 nd->nd_procnum = NFSPROC_NOOP;
2035 return (0);
2036 }
2037 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr);
2038 nd->nd_flag |= ND_KERBNICK;
2039 };
2040 } else {
2041 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED);
2042 nd->nd_procnum = NFSPROC_NOOP;
2043 return (0);
2044 }
2045
2046 /*
2047 * For nqnfs, get piggybacked lease request.
2048 */
2049 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) {
2050 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
2051 nd->nd_flag |= fxdr_unsigned(int, *tl);
2052 if (nd->nd_flag & ND_LEASE) {
2053 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED);
2054 nd->nd_duration = fxdr_unsigned(int32_t, *tl);
2055 } else
2056 nd->nd_duration = NQ_MINLEASE;
2057 } else
2058 nd->nd_duration = NQ_MINLEASE;
2059 nd->nd_md = md;
2060 nd->nd_dpos = dpos;
2061 return (0);
2062nfsmout:
2063 return (error);
2064}
2065
2066#endif
2067
b70ddfbf
MD
2068/*
2069 * Send a message to the originating process's terminal. The thread and/or
2070 * process may be NULL. YYY the thread should not be NULL but there may
2071 * still be some uio_td's that are still being passed as NULL through to
2072 * nfsm_request().
2073 */
984263bc 2074static int
dadab5e9 2075nfs_msg(struct thread *td, char *server, char *msg)
984263bc
MD
2076{
2077 tpr_t tpr;
2078
b70ddfbf 2079 if (td && td->td_proc)
dadab5e9 2080 tpr = tprintf_open(td->td_proc);
984263bc
MD
2081 else
2082 tpr = NULL;
2083 tprintf(tpr, "nfs server %s: %s\n", server, msg);
2084 tprintf_close(tpr);
2085 return (0);
2086}
2087
2088#ifndef NFS_NOSERVER
2089/*
2090 * Socket upcall routine for the nfsd sockets.
2091 * The caddr_t arg is a pointer to the "struct nfssvc_sock".
2092 * Essentially do as much as possible non-blocking, else punt and it will
74f1caca 2093 * be called with MB_WAIT from an nfsd.
984263bc
MD
2094 */
2095void
e851b29e 2096nfsrv_rcv(struct socket *so, void *arg, int waitflag)
984263bc 2097{
40393ded
RG
2098 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg;
2099 struct mbuf *m;
984263bc
MD
2100 struct mbuf *mp;
2101 struct sockaddr *nam;
2102 struct uio auio;
2103 int flags, error;
52553028 2104 int nparallel_wakeup = 0;
984263bc
MD
2105
2106 if ((slp->ns_flag & SLP_VALID) == 0)
2107 return;
3b101e2e 2108
984263bc 2109 /*
52553028
MD
2110 * Do not allow an infinite number of completed RPC records to build
2111 * up before we stop reading data from the socket. Otherwise we could
2112 * end up holding onto an unreasonable number of mbufs for requests
2113 * waiting for service.
2114 *
2115 * This should give pretty good feedback to the TCP
3b101e2e
MD
2116 * layer and prevents a memory crunch for other protocols.
2117 *
2118 * Note that the same service socket can be dispatched to several
2119 * nfs servers simultaniously.
2120 *
2121 * the tcp protocol callback calls us with MB_DONTWAIT.
2122 * nfsd calls us with MB_WAIT (typically).
984263bc 2123 */
52553028 2124 if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) {
3b101e2e
MD
2125 slp->ns_flag |= SLP_NEEDQ;
2126 goto dorecs;
984263bc 2127 }
3b101e2e
MD
2128
2129 /*
2130 * Handle protocol specifics to parse an RPC request. We always
2131 * pull from the socket using non-blocking I/O.
2132 */
dadab5e9 2133 auio.uio_td = NULL;
984263bc
MD
2134 if (so->so_type == SOCK_STREAM) {
2135 /*
3b101e2e
MD
2136 * The data has to be read in an orderly fashion from a TCP
2137 * stream, unlike a UDP socket. It is possible for soreceive
2138 * and/or nfsrv_getstream() to block, so make sure only one
2139 * entity is messing around with the TCP stream at any given
2140 * moment. The receive sockbuf's lock in soreceive is not
2141 * sufficient.
2142 *
2143 * Note that this procedure can be called from any number of
2144 * NFS severs *OR* can be upcalled directly from a TCP
2145 * protocol thread.
984263bc 2146 */
3b101e2e 2147 if (slp->ns_flag & SLP_GETSTREAM) {
984263bc
MD
2148 slp->ns_flag |= SLP_NEEDQ;
2149 goto dorecs;
2150 }
3b101e2e 2151 slp->ns_flag |= SLP_GETSTREAM;
984263bc
MD
2152
2153 /*
2154 * Do soreceive().
2155 */
2156 auio.uio_resid = 1000000000;
2157 flags = MSG_DONTWAIT;
6b6e0885 2158 error = so_pru_soreceive(so, &nam, &auio, &mp, NULL, &flags);
984263bc
MD
2159 if (error || mp == (struct mbuf *)0) {
2160 if (error == EWOULDBLOCK)
2161 slp->ns_flag |= SLP_NEEDQ;
2162 else
2163 slp->ns_flag |= SLP_DISCONN;
3b101e2e 2164 slp->ns_flag &= ~SLP_GETSTREAM;
984263bc
MD
2165 goto dorecs;
2166 }
2167 m = mp;
2168 if (slp->ns_rawend) {
2169 slp->ns_rawend->m_next = m;
2170 slp->ns_cc += 1000000000 - auio.uio_resid;
2171 } else {
2172 slp->ns_raw = m;
2173 slp->ns_cc = 1000000000 - auio.uio_resid;
2174 }
2175 while (m->m_next)
2176 m = m->m_next;
2177 slp->ns_rawend = m;
2178
2179 /*
3b101e2e
MD
2180 * Now try and parse as many record(s) as we can out of the
2181 * raw stream data.
984263bc 2182 */
52553028 2183 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup);
984263bc
MD
2184 if (error) {
2185 if (error == EPERM)
2186 slp->ns_flag |= SLP_DISCONN;
2187 else
2188 slp->ns_flag |= SLP_NEEDQ;
2189 }
3b101e2e 2190 slp->ns_flag &= ~SLP_GETSTREAM;
984263bc 2191 } else {
3b101e2e
MD
2192 /*
2193 * For UDP soreceive typically pulls just one packet, loop
2194 * to get the whole batch.
2195 */
984263bc
MD
2196 do {
2197 auio.uio_resid = 1000000000;
2198 flags = MSG_DONTWAIT;
6b6e0885
JH
2199 error = so_pru_soreceive(so, &nam, &auio, &mp, NULL,
2200 &flags);
984263bc
MD
2201 if (mp) {
2202 struct nfsrv_rec *rec;
74f1caca 2203 int mf = (waitflag & MB_DONTWAIT) ?
da004c97 2204 M_NOWAIT : M_WAITOK;
984263bc 2205 rec = malloc(sizeof(struct nfsrv_rec),
da004c97 2206 M_NFSRVDESC, mf);
984263bc
MD
2207 if (!rec) {
2208 if (nam)
2209 FREE(nam, M_SONAME);
2210 m_freem(mp);
2211 continue;
2212 }
2213 nfs_realign(&mp, 10 * NFSX_UNSIGNED);
2214 rec->nr_address = nam;
2215 rec->nr_packet = mp;
2216 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
52553028
MD
2217 ++slp->ns_numrec;
2218 ++nparallel_wakeup;
984263bc
MD
2219 }
2220 if (error) {
2221 if ((so->so_proto->pr_flags & PR_CONNREQUIRED)
2222 && error != EWOULDBLOCK) {
2223 slp->ns_flag |= SLP_DISCONN;
2224 goto dorecs;
2225 }
2226 }
2227 } while (mp);
2228 }
2229
2230 /*
3b101e2e
MD
2231 * If we were upcalled from the tcp protocol layer and we have
2232 * fully parsed records ready to go, or there is new data pending,
2233 * or something went wrong, try to wake up an nfsd thread to deal
2234 * with it.
984263bc
MD
2235 */
2236dorecs:
52553028 2237 if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0
3b101e2e 2238 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) {
52553028 2239 nfsrv_wakenfsd(slp, nparallel_wakeup);
3b101e2e 2240 }
984263bc
MD
2241}
2242
2243/*
2244 * Try and extract an RPC request from the mbuf data list received on a
2245 * stream socket. The "waitflag" argument indicates whether or not it
2246 * can sleep.
2247 */
2248static int
52553028 2249nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp)
984263bc 2250{
40393ded
RG
2251 struct mbuf *m, **mpp;
2252 char *cp1, *cp2;
2253 int len;
984263bc
MD
2254 struct mbuf *om, *m2, *recm;
2255 u_int32_t recmark;
2256
984263bc
MD
2257 for (;;) {
2258 if (slp->ns_reclen == 0) {
3b101e2e 2259 if (slp->ns_cc < NFSX_UNSIGNED)
984263bc 2260 return (0);
984263bc
MD
2261 m = slp->ns_raw;
2262 if (m->m_len >= NFSX_UNSIGNED) {
2263 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED);
2264 m->m_data += NFSX_UNSIGNED;
2265 m->m_len -= NFSX_UNSIGNED;
2266 } else {
2267 cp1 = (caddr_t)&recmark;
2268 cp2 = mtod(m, caddr_t);
2269 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) {
2270 while (m->m_len == 0) {
2271 m = m->m_next;
2272 cp2 = mtod(m, caddr_t);
2273 }
2274 *cp1++ = *cp2++;
2275 m->m_data++;
2276 m->m_len--;
2277 }
2278 }
2279 slp->ns_cc -= NFSX_UNSIGNED;
2280 recmark = ntohl(recmark);
2281 slp->ns_reclen = recmark & ~0x80000000;
2282 if (recmark & 0x80000000)
2283 slp->ns_flag |= SLP_LASTFRAG;
2284 else
2285 slp->ns_flag &= ~SLP_LASTFRAG;
43884890 2286 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) {
63cd2150
MD
2287 log(LOG_ERR, "%s (%d) from nfs client\n",
2288 "impossible packet length",
2289 slp->ns_reclen);
984263bc
MD
2290 return (EPERM);
2291 }
2292 }
2293
2294 /*
2295 * Now get the record part.
2296 *
2297 * Note that slp->ns_reclen may be 0. Linux sometimes
2298 * generates 0-length RPCs
2299 */
2300 recm = NULL;
2301 if (slp->ns_cc == slp->ns_reclen) {
2302 recm = slp->ns_raw;
2303 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0;
2304 slp->ns_cc = slp->ns_reclen = 0;
2305 } else if (slp->ns_cc > slp->ns_reclen) {
2306 len = 0;
2307 m = slp->ns_raw;
2308 om = (struct mbuf *)0;
2309
2310 while (len < slp->ns_reclen) {
2311 if ((len + m->m_len) > slp->ns_reclen) {
2312 m2 = m_copym(m, 0, slp->ns_reclen - len,
2313 waitflag);
2314 if (m2) {
2315 if (om) {
2316 om->m_next = m2;
2317 recm = slp->ns_raw;
2318 } else
2319 recm = m2;
2320 m->m_data += slp->ns_reclen - len;
2321 m->m_len -= slp->ns_reclen - len;
2322 len = slp->ns_reclen;
2323 } else {
984263bc
MD
2324 return (EWOULDBLOCK);
2325 }
2326 } else if ((len + m->m_len) == slp->ns_reclen) {
2327 om = m;
2328 len += m->m_len;
2329 m = m->m_next;
2330 recm = slp->ns_raw;
2331 om->m_next = (struct mbuf *)0;
2332 } else {
2333 om = m;
2334 len += m->m_len;
2335 m = m->m_next;
2336 }
2337 }
2338 slp->ns_raw = m;
2339 slp->ns_cc -= len;
2340 slp->ns_reclen = 0;
2341 } else {
984263bc
MD
2342 return (0);
2343 }
2344
2345 /*
2346 * Accumulate the fragments into a record.
2347 */
2348 mpp = &slp->ns_frag;
2349 while (*mpp)
2350 mpp = &((*mpp)->m_next);
2351 *mpp = recm;
2352 if (slp->ns_flag & SLP_LASTFRAG) {
2353 struct nfsrv_rec *rec;
74f1caca 2354 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK;
da004c97 2355 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf);
984263bc
MD
2356 if (!rec) {
2357 m_freem(slp->ns_frag);
2358 } else {
2359 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED);
2360 rec->nr_address = (struct sockaddr *)0;
2361 rec->nr_packet = slp->ns_frag;
2362 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link);
52553028
MD
2363 ++slp->ns_numrec;
2364 ++*countp;
984263bc
MD
2365 }
2366 slp->ns_frag = (struct mbuf *)0;
2367 }
2368 }
2369}
2370
2371/*
2372 * Parse an RPC header.
2373 */
2374int
e851b29e
CP
2375nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd,
2376 struct nfsrv_descript **ndp)
984263bc
MD
2377{
2378 struct nfsrv_rec *rec;
40393ded 2379 struct mbuf *m;
984263bc 2380 struct sockaddr *nam;
40393ded 2381 struct nfsrv_descript *nd;
984263bc
MD
2382 int error;
2383
2384 *ndp = NULL;
2385 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec))
2386 return (ENOBUFS);
2387 rec = STAILQ_FIRST(&slp->ns_rec);
2388 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link);
52553028
MD
2389 KKASSERT(slp->ns_numrec > 0);
2390 --slp->ns_numrec;
984263bc
MD
2391 nam = rec->nr_address;
2392 m = rec->nr_packet;
2393 free(rec, M_NFSRVDESC);
2394 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript),
2395 M_NFSRVDESC, M_WAITOK);
2396 nd->nd_md = nd->nd_mrep = m;
2397 nd->nd_nam2 = nam;
2398 nd->nd_dpos = mtod(m, caddr_t);
2399 error = nfs_getreq(nd, nfsd, TRUE);
2400 if (error) {
2401 if (nam) {
2402 FREE(nam, M_SONAME);
2403 }
2404 free((caddr_t)nd, M_NFSRVDESC);
2405 return (error);
2406 }
2407 *ndp = nd;
2408 nfsd->nfsd_nd = nd;
2409 return (0);
2410}
2411
2412/*
52553028
MD
2413 * Try to assign service sockets to nfsd threads based on the number
2414 * of new rpc requests that have been queued on the service socket.
2415 *
2416 * If no nfsd's are available or additonal requests are pending, set the
2417 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for
2418 * the work in the nfssvc_sock list when it is finished processing its
2419 * current work. This flag is only cleared when an nfsd can not find
2420 * any new work to perform.
984263bc
MD
2421 */
2422void
52553028 2423nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel)
984263bc 2424{
40393ded 2425 struct nfsd *nd;
984263bc
MD
2426
2427 if ((slp->ns_flag & SLP_VALID) == 0)
2428 return;
52553028
MD
2429 if (nparallel <= 1)
2430 nparallel = 1;
ecd80f47 2431 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) {
984263bc
MD
2432 if (nd->nfsd_flag & NFSD_WAITING) {
2433 nd->nfsd_flag &= ~NFSD_WAITING;
2434 if (nd->nfsd_slp)
2435 panic("nfsd wakeup");
2436 slp->ns_sref++;
2437 nd->nfsd_slp = slp;
2438 wakeup((caddr_t)nd);
52553028
MD
2439 if (--nparallel == 0)
2440 break;
984263bc
MD
2441 }
2442 }
52553028
MD
2443 if (nparallel) {
2444 slp->ns_flag |= SLP_DOREC;
2445 nfsd_head_flag |= NFSD_CHECKSLP;
2446 }
984263bc
MD
2447}
2448#endif /* NFS_NOSERVER */