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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 /*
38 * Socket operations for use by nfs
39 */
40
41 #include "opt_kgssapi.h"
42 #include "opt_nfs.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
47 #include <sys/limits.h>
48 #include <sys/lock.h>
49 #include <sys/malloc.h>
50 #include <sys/mbuf.h>
51 #include <sys/mount.h>
52 #include <sys/mutex.h>
53 #include <sys/proc.h>
54 #include <sys/signalvar.h>
55 #include <sys/syscallsubr.h>
56 #include <sys/sysctl.h>
57 #include <sys/syslog.h>
58 #include <sys/vnode.h>
59
60 #include <rpc/rpc.h>
61 #include <rpc/krpc.h>
62
63 #include <kgssapi/krb5/kcrypto.h>
64
65 #include <fs/nfs/nfsport.h>
66
67 #ifdef KDTRACE_HOOKS
68 #include <sys/dtrace_bsd.h>
69
70 dtrace_nfsclient_nfs23_start_probe_func_t
71 dtrace_nfscl_nfs234_start_probe;
72
73 dtrace_nfsclient_nfs23_done_probe_func_t
74 dtrace_nfscl_nfs234_done_probe;
75
76 /*
77 * Registered probes by RPC type.
78 */
79 uint32_t nfscl_nfs2_start_probes[NFSV41_NPROCS + 1];
80 uint32_t nfscl_nfs2_done_probes[NFSV41_NPROCS + 1];
81
82 uint32_t nfscl_nfs3_start_probes[NFSV41_NPROCS + 1];
83 uint32_t nfscl_nfs3_done_probes[NFSV41_NPROCS + 1];
84
85 uint32_t nfscl_nfs4_start_probes[NFSV41_NPROCS + 1];
86 uint32_t nfscl_nfs4_done_probes[NFSV41_NPROCS + 1];
87 #endif
88
89 NFSSTATESPINLOCK;
90 NFSREQSPINLOCK;
91 NFSDLOCKMUTEX;
92 NFSCLSTATEMUTEX;
93 extern struct nfsstatsv1 nfsstatsv1;
94 extern struct nfsreqhead nfsd_reqq;
95 extern int nfscl_ticks;
96 extern void (*ncl_call_invalcaches)(struct vnode *);
97 extern int nfs_numnfscbd;
98 extern int nfscl_debuglevel;
99
100 SVCPOOL *nfscbd_pool;
101 static int nfsrv_gsscallbackson = 0;
102 static int nfs_bufpackets = 4;
103 static int nfs_reconnects;
104 static int nfs3_jukebox_delay = 10;
105 static int nfs_skip_wcc_data_onerr = 1;
106
107 SYSCTL_DECL(_vfs_nfs);
108
109 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0,
110 "Buffer reservation size 2 < x < 64");
111 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0,
112 "Number of times the nfs client has had to reconnect");
113 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW, &nfs3_jukebox_delay, 0,
114 "Number of seconds to delay a retry after receiving EJUKEBOX");
115 SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW, &nfs_skip_wcc_data_onerr, 0,
116 "Disable weak cache consistency checking when server returns an error");
117
118 static void nfs_down(struct nfsmount *, struct thread *, const char *,
119 int, int);
120 static void nfs_up(struct nfsmount *, struct thread *, const char *,
121 int, int);
122 static int nfs_msg(struct thread *, const char *, const char *, int);
123
124 struct nfs_cached_auth {
125 int ca_refs; /* refcount, including 1 from the cache */
126 uid_t ca_uid; /* uid that corresponds to this auth */
127 AUTH *ca_auth; /* RPC auth handle */
128 };
129
130 static int nfsv2_procid[NFS_V3NPROCS] = {
131 NFSV2PROC_NULL,
132 NFSV2PROC_GETATTR,
133 NFSV2PROC_SETATTR,
134 NFSV2PROC_LOOKUP,
135 NFSV2PROC_NOOP,
136 NFSV2PROC_READLINK,
137 NFSV2PROC_READ,
138 NFSV2PROC_WRITE,
139 NFSV2PROC_CREATE,
140 NFSV2PROC_MKDIR,
141 NFSV2PROC_SYMLINK,
142 NFSV2PROC_CREATE,
143 NFSV2PROC_REMOVE,
144 NFSV2PROC_RMDIR,
145 NFSV2PROC_RENAME,
146 NFSV2PROC_LINK,
147 NFSV2PROC_READDIR,
148 NFSV2PROC_NOOP,
149 NFSV2PROC_STATFS,
150 NFSV2PROC_NOOP,
151 NFSV2PROC_NOOP,
152 NFSV2PROC_NOOP,
153 };
154
155 /*
156 * Initialize sockets and congestion for a new NFS connection.
157 * We do not free the sockaddr if error.
158 */
159 int
newnfs_connect(struct nfsmount * nmp,struct nfssockreq * nrp,struct ucred * cred,NFSPROC_T * p,int callback_retry_mult)160 newnfs_connect(struct nfsmount *nmp, struct nfssockreq *nrp,
161 struct ucred *cred, NFSPROC_T *p, int callback_retry_mult)
162 {
163 int rcvreserve, sndreserve;
164 int pktscale, pktscalesav;
165 struct sockaddr *saddr;
166 struct ucred *origcred;
167 CLIENT *client;
168 struct netconfig *nconf;
169 struct socket *so;
170 int one = 1, retries, error = 0;
171 struct thread *td = curthread;
172 SVCXPRT *xprt;
173 struct timeval timo;
174
175 /*
176 * We need to establish the socket using the credentials of
177 * the mountpoint. Some parts of this process (such as
178 * sobind() and soconnect()) will use the curent thread's
179 * credential instead of the socket credential. To work
180 * around this, temporarily change the current thread's
181 * credential to that of the mountpoint.
182 *
183 * XXX: It would be better to explicitly pass the correct
184 * credential to sobind() and soconnect().
185 */
186 origcred = td->td_ucred;
187
188 /*
189 * Use the credential in nr_cred, if not NULL.
190 */
191 if (nrp->nr_cred != NULL)
192 td->td_ucred = nrp->nr_cred;
193 else
194 td->td_ucred = cred;
195 saddr = nrp->nr_nam;
196
197 if (saddr->sa_family == AF_INET)
198 if (nrp->nr_sotype == SOCK_DGRAM)
199 nconf = getnetconfigent("udp");
200 else
201 nconf = getnetconfigent("tcp");
202 else
203 if (nrp->nr_sotype == SOCK_DGRAM)
204 nconf = getnetconfigent("udp6");
205 else
206 nconf = getnetconfigent("tcp6");
207
208 pktscale = nfs_bufpackets;
209 if (pktscale < 2)
210 pktscale = 2;
211 if (pktscale > 64)
212 pktscale = 64;
213 pktscalesav = pktscale;
214 /*
215 * soreserve() can fail if sb_max is too small, so shrink pktscale
216 * and try again if there is an error.
217 * Print a log message suggesting increasing sb_max.
218 * Creating a socket and doing this is necessary since, if the
219 * reservation sizes are too large and will make soreserve() fail,
220 * the connection will work until a large send is attempted and
221 * then it will loop in the krpc code.
222 */
223 so = NULL;
224 saddr = NFSSOCKADDR(nrp->nr_nam, struct sockaddr *);
225 error = socreate(saddr->sa_family, &so, nrp->nr_sotype,
226 nrp->nr_soproto, td->td_ucred, td);
227 if (error) {
228 td->td_ucred = origcred;
229 goto out;
230 }
231 do {
232 if (error != 0 && pktscale > 2) {
233 if (nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
234 pktscale == pktscalesav)
235 printf("Consider increasing kern.ipc.maxsockbuf\n");
236 pktscale--;
237 }
238 if (nrp->nr_sotype == SOCK_DGRAM) {
239 if (nmp != NULL) {
240 sndreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
241 pktscale;
242 rcvreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) *
243 pktscale;
244 } else {
245 sndreserve = rcvreserve = 1024 * pktscale;
246 }
247 } else {
248 if (nrp->nr_sotype != SOCK_STREAM)
249 panic("nfscon sotype");
250 if (nmp != NULL) {
251 sndreserve = (NFS_MAXBSIZE + NFS_MAXXDR +
252 sizeof (u_int32_t)) * pktscale;
253 rcvreserve = (NFS_MAXBSIZE + NFS_MAXXDR +
254 sizeof (u_int32_t)) * pktscale;
255 } else {
256 sndreserve = rcvreserve = 1024 * pktscale;
257 }
258 }
259 error = soreserve(so, sndreserve, rcvreserve);
260 if (error != 0 && nmp != NULL && nrp->nr_sotype == SOCK_STREAM &&
261 pktscale <= 2)
262 printf("Must increase kern.ipc.maxsockbuf or reduce"
263 " rsize, wsize\n");
264 } while (error != 0 && pktscale > 2);
265 soclose(so);
266 if (error) {
267 td->td_ucred = origcred;
268 goto out;
269 }
270
271 client = clnt_reconnect_create(nconf, saddr, nrp->nr_prog,
272 nrp->nr_vers, sndreserve, rcvreserve);
273 CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq");
274 if (nmp != NULL) {
275 if ((nmp->nm_flag & NFSMNT_INT))
276 CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one);
277 if ((nmp->nm_flag & NFSMNT_RESVPORT))
278 CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
279 if (NFSHASSOFT(nmp)) {
280 if (nmp->nm_sotype == SOCK_DGRAM)
281 /*
282 * For UDP, the large timeout for a reconnect
283 * will be set to "nm_retry * nm_timeo / 2", so
284 * we only want to do 2 reconnect timeout
285 * retries.
286 */
287 retries = 2;
288 else
289 retries = nmp->nm_retry;
290 } else
291 retries = INT_MAX;
292 /* cred == NULL for DS connects. */
293 if (NFSHASNFSV4N(nmp) && cred != NULL) {
294 /*
295 * Make sure the nfscbd_pool doesn't get destroyed
296 * while doing this.
297 */
298 NFSD_LOCK();
299 if (nfs_numnfscbd > 0) {
300 nfs_numnfscbd++;
301 NFSD_UNLOCK();
302 xprt = svc_vc_create_backchannel(nfscbd_pool);
303 CLNT_CONTROL(client, CLSET_BACKCHANNEL, xprt);
304 NFSD_LOCK();
305 nfs_numnfscbd--;
306 if (nfs_numnfscbd == 0)
307 wakeup(&nfs_numnfscbd);
308 }
309 NFSD_UNLOCK();
310 }
311 } else {
312 /*
313 * Three cases:
314 * - Null RPC callback to client
315 * - Non-Null RPC callback to client, wait a little longer
316 * - upcalls to nfsuserd and gssd (clp == NULL)
317 */
318 if (callback_retry_mult == 0) {
319 retries = NFSV4_UPCALLRETRY;
320 CLNT_CONTROL(client, CLSET_PRIVPORT, &one);
321 } else {
322 retries = NFSV4_CALLBACKRETRY * callback_retry_mult;
323 }
324 }
325 CLNT_CONTROL(client, CLSET_RETRIES, &retries);
326
327 if (nmp != NULL) {
328 /*
329 * For UDP, there are 2 timeouts:
330 * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer
331 * that does a retransmit of an RPC request using the same
332 * socket and xid. This is what you normally want to do,
333 * since NFS servers depend on "same xid" for their
334 * Duplicate Request Cache.
335 * - timeout specified in CLNT_CALL_MBUF(), which specifies when
336 * retransmits on the same socket should fail and a fresh
337 * socket created. Each of these timeouts counts as one
338 * CLSET_RETRIES as set above.
339 * Set the initial retransmit timeout for UDP. This timeout
340 * doesn't exist for TCP and the following call just fails,
341 * which is ok.
342 */
343 timo.tv_sec = nmp->nm_timeo / NFS_HZ;
344 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ;
345 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo);
346 }
347
348 mtx_lock(&nrp->nr_mtx);
349 if (nrp->nr_client != NULL) {
350 mtx_unlock(&nrp->nr_mtx);
351 /*
352 * Someone else already connected.
353 */
354 CLNT_RELEASE(client);
355 } else {
356 nrp->nr_client = client;
357 /*
358 * Protocols that do not require connections may be optionally
359 * left unconnected for servers that reply from a port other
360 * than NFS_PORT.
361 */
362 if (nmp == NULL || (nmp->nm_flag & NFSMNT_NOCONN) == 0) {
363 mtx_unlock(&nrp->nr_mtx);
364 CLNT_CONTROL(client, CLSET_CONNECT, &one);
365 } else
366 mtx_unlock(&nrp->nr_mtx);
367 }
368
369
370 /* Restore current thread's credentials. */
371 td->td_ucred = origcred;
372
373 out:
374 NFSEXITCODE(error);
375 return (error);
376 }
377
378 /*
379 * NFS disconnect. Clean up and unlink.
380 */
381 void
newnfs_disconnect(struct nfssockreq * nrp)382 newnfs_disconnect(struct nfssockreq *nrp)
383 {
384 CLIENT *client;
385
386 mtx_lock(&nrp->nr_mtx);
387 if (nrp->nr_client != NULL) {
388 client = nrp->nr_client;
389 nrp->nr_client = NULL;
390 mtx_unlock(&nrp->nr_mtx);
391 rpc_gss_secpurge_call(client);
392 CLNT_CLOSE(client);
393 CLNT_RELEASE(client);
394 } else {
395 mtx_unlock(&nrp->nr_mtx);
396 }
397 }
398
399 static AUTH *
nfs_getauth(struct nfssockreq * nrp,int secflavour,char * clnt_principal,char * srv_principal,gss_OID mech_oid,struct ucred * cred)400 nfs_getauth(struct nfssockreq *nrp, int secflavour, char *clnt_principal,
401 char *srv_principal, gss_OID mech_oid, struct ucred *cred)
402 {
403 rpc_gss_service_t svc;
404 AUTH *auth;
405
406 switch (secflavour) {
407 case RPCSEC_GSS_KRB5:
408 case RPCSEC_GSS_KRB5I:
409 case RPCSEC_GSS_KRB5P:
410 if (!mech_oid) {
411 if (!rpc_gss_mech_to_oid_call("kerberosv5", &mech_oid))
412 return (NULL);
413 }
414 if (secflavour == RPCSEC_GSS_KRB5)
415 svc = rpc_gss_svc_none;
416 else if (secflavour == RPCSEC_GSS_KRB5I)
417 svc = rpc_gss_svc_integrity;
418 else
419 svc = rpc_gss_svc_privacy;
420
421 if (clnt_principal == NULL)
422 auth = rpc_gss_secfind_call(nrp->nr_client, cred,
423 srv_principal, mech_oid, svc);
424 else {
425 auth = rpc_gss_seccreate_call(nrp->nr_client, cred,
426 clnt_principal, srv_principal, "kerberosv5",
427 svc, NULL, NULL, NULL);
428 return (auth);
429 }
430 if (auth != NULL)
431 return (auth);
432 /* fallthrough */
433 case AUTH_SYS:
434 default:
435 return (authunix_create(cred));
436
437 }
438 }
439
440 /*
441 * Callback from the RPC code to generate up/down notifications.
442 */
443
444 struct nfs_feedback_arg {
445 struct nfsmount *nf_mount;
446 int nf_lastmsg; /* last tprintf */
447 int nf_tprintfmsg;
448 struct thread *nf_td;
449 };
450
451 static void
nfs_feedback(int type,int proc,void * arg)452 nfs_feedback(int type, int proc, void *arg)
453 {
454 struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg;
455 struct nfsmount *nmp = nf->nf_mount;
456 time_t now;
457
458 switch (type) {
459 case FEEDBACK_REXMIT2:
460 case FEEDBACK_RECONNECT:
461 now = NFSD_MONOSEC;
462 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) {
463 nfs_down(nmp, nf->nf_td,
464 "not responding", 0, NFSSTA_TIMEO);
465 nf->nf_tprintfmsg = TRUE;
466 nf->nf_lastmsg = now;
467 }
468 break;
469
470 case FEEDBACK_OK:
471 nfs_up(nf->nf_mount, nf->nf_td,
472 "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg);
473 break;
474 }
475 }
476
477 /*
478 * newnfs_request - goes something like this
479 * - does the rpc by calling the krpc layer
480 * - break down rpc header and return with nfs reply
481 * nb: always frees up nd_mreq mbuf list
482 */
483 int
newnfs_request(struct nfsrv_descript * nd,struct nfsmount * nmp,struct nfsclient * clp,struct nfssockreq * nrp,vnode_t vp,struct thread * td,struct ucred * cred,u_int32_t prog,u_int32_t vers,u_char * retsum,int toplevel,u_int64_t * xidp,struct nfsclsession * dssep)484 newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp,
485 struct nfsclient *clp, struct nfssockreq *nrp, vnode_t vp,
486 struct thread *td, struct ucred *cred, u_int32_t prog, u_int32_t vers,
487 u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep)
488 {
489 uint32_t retseq, retval, slotseq, *tl;
490 time_t waituntil;
491 int i = 0, j = 0, opcnt, set_sigset = 0, slot;
492 int trycnt, error = 0, usegssname = 0, secflavour = AUTH_SYS;
493 int freeslot, maxslot, reterr, slotpos, timeo;
494 u_int16_t procnum;
495 u_int trylater_delay = 1;
496 struct nfs_feedback_arg nf;
497 struct timeval timo;
498 AUTH *auth;
499 struct rpc_callextra ext;
500 enum clnt_stat stat;
501 struct nfsreq *rep = NULL;
502 char *srv_principal = NULL, *clnt_principal = NULL;
503 sigset_t oldset;
504 struct ucred *authcred;
505 struct nfsclsession *sep;
506 uint8_t sessionid[NFSX_V4SESSIONID];
507
508 sep = dssep;
509 if (xidp != NULL)
510 *xidp = 0;
511 /* Reject requests while attempting a forced unmount. */
512 if (nmp != NULL && NFSCL_FORCEDISM(nmp->nm_mountp)) {
513 m_freem(nd->nd_mreq);
514 return (ESTALE);
515 }
516
517 /*
518 * Set authcred, which is used to acquire RPC credentials to
519 * the cred argument, by default. The crhold() should not be
520 * necessary, but will ensure that some future code change
521 * doesn't result in the credential being free'd prematurely.
522 */
523 authcred = crhold(cred);
524
525 /* For client side interruptible mounts, mask off the signals. */
526 if (nmp != NULL && td != NULL && NFSHASINT(nmp)) {
527 newnfs_set_sigmask(td, &oldset);
528 set_sigset = 1;
529 }
530
531 /*
532 * XXX if not already connected call nfs_connect now. Longer
533 * term, change nfs_mount to call nfs_connect unconditionally
534 * and let clnt_reconnect_create handle reconnects.
535 */
536 if (nrp->nr_client == NULL)
537 newnfs_connect(nmp, nrp, cred, td, 0);
538
539 /*
540 * For a client side mount, nmp is != NULL and clp == NULL. For
541 * server calls (callbacks or upcalls), nmp == NULL.
542 */
543 if (clp != NULL) {
544 NFSLOCKSTATE();
545 if ((clp->lc_flags & LCL_GSS) && nfsrv_gsscallbackson) {
546 secflavour = RPCSEC_GSS_KRB5;
547 if (nd->nd_procnum != NFSPROC_NULL) {
548 if (clp->lc_flags & LCL_GSSINTEGRITY)
549 secflavour = RPCSEC_GSS_KRB5I;
550 else if (clp->lc_flags & LCL_GSSPRIVACY)
551 secflavour = RPCSEC_GSS_KRB5P;
552 }
553 }
554 NFSUNLOCKSTATE();
555 } else if (nmp != NULL && NFSHASKERB(nmp) &&
556 nd->nd_procnum != NFSPROC_NULL) {
557 if (NFSHASALLGSSNAME(nmp) && nmp->nm_krbnamelen > 0)
558 nd->nd_flag |= ND_USEGSSNAME;
559 if ((nd->nd_flag & ND_USEGSSNAME) != 0) {
560 /*
561 * If there is a client side host based credential,
562 * use that, otherwise use the system uid, if set.
563 * The system uid is in the nmp->nm_sockreq.nr_cred
564 * credentials.
565 */
566 if (nmp->nm_krbnamelen > 0) {
567 usegssname = 1;
568 clnt_principal = nmp->nm_krbname;
569 } else if (nmp->nm_uid != (uid_t)-1) {
570 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
571 ("newnfs_request: NULL nr_cred"));
572 crfree(authcred);
573 authcred = crhold(nmp->nm_sockreq.nr_cred);
574 }
575 } else if (nmp->nm_krbnamelen == 0 &&
576 nmp->nm_uid != (uid_t)-1 && cred->cr_uid == (uid_t)0) {
577 /*
578 * If there is no host based principal name and
579 * the system uid is set and this is root, use the
580 * system uid, since root won't have user
581 * credentials in a credentials cache file.
582 * The system uid is in the nmp->nm_sockreq.nr_cred
583 * credentials.
584 */
585 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
586 ("newnfs_request: NULL nr_cred"));
587 crfree(authcred);
588 authcred = crhold(nmp->nm_sockreq.nr_cred);
589 }
590 if (NFSHASINTEGRITY(nmp))
591 secflavour = RPCSEC_GSS_KRB5I;
592 else if (NFSHASPRIVACY(nmp))
593 secflavour = RPCSEC_GSS_KRB5P;
594 else
595 secflavour = RPCSEC_GSS_KRB5;
596 srv_principal = NFSMNT_SRVKRBNAME(nmp);
597 } else if (nmp != NULL && !NFSHASKERB(nmp) &&
598 nd->nd_procnum != NFSPROC_NULL &&
599 (nd->nd_flag & ND_USEGSSNAME) != 0) {
600 /*
601 * Use the uid that did the mount when the RPC is doing
602 * NFSv4 system operations, as indicated by the
603 * ND_USEGSSNAME flag, for the AUTH_SYS case.
604 * The credentials in nm_sockreq.nr_cred were used for the
605 * mount.
606 */
607 KASSERT(nmp->nm_sockreq.nr_cred != NULL,
608 ("newnfs_request: NULL nr_cred"));
609 crfree(authcred);
610 authcred = crhold(nmp->nm_sockreq.nr_cred);
611 }
612
613 if (nmp != NULL) {
614 bzero(&nf, sizeof(struct nfs_feedback_arg));
615 nf.nf_mount = nmp;
616 nf.nf_td = td;
617 nf.nf_lastmsg = NFSD_MONOSEC -
618 ((nmp->nm_tprintf_delay)-(nmp->nm_tprintf_initial_delay));
619 }
620
621 if (nd->nd_procnum == NFSPROC_NULL)
622 auth = authnone_create();
623 else if (usegssname) {
624 /*
625 * For this case, the authenticator is held in the
626 * nfssockreq structure, so don't release the reference count
627 * held on it. --> Don't AUTH_DESTROY() it in this function.
628 */
629 if (nrp->nr_auth == NULL)
630 nrp->nr_auth = nfs_getauth(nrp, secflavour,
631 clnt_principal, srv_principal, NULL, authcred);
632 else
633 rpc_gss_refresh_auth_call(nrp->nr_auth);
634 auth = nrp->nr_auth;
635 } else
636 auth = nfs_getauth(nrp, secflavour, NULL,
637 srv_principal, NULL, authcred);
638 crfree(authcred);
639 if (auth == NULL) {
640 m_freem(nd->nd_mreq);
641 if (set_sigset)
642 newnfs_restore_sigmask(td, &oldset);
643 return (EACCES);
644 }
645 bzero(&ext, sizeof(ext));
646 ext.rc_auth = auth;
647 if (nmp != NULL) {
648 ext.rc_feedback = nfs_feedback;
649 ext.rc_feedback_arg = &nf;
650 }
651
652 procnum = nd->nd_procnum;
653 if ((nd->nd_flag & ND_NFSV4) &&
654 nd->nd_procnum != NFSPROC_NULL &&
655 nd->nd_procnum != NFSV4PROC_CBCOMPOUND)
656 procnum = NFSV4PROC_COMPOUND;
657
658 if (nmp != NULL) {
659 NFSINCRGLOBAL(nfsstatsv1.rpcrequests);
660
661 /* Map the procnum to the old NFSv2 one, as required. */
662 if ((nd->nd_flag & ND_NFSV2) != 0) {
663 if (nd->nd_procnum < NFS_V3NPROCS)
664 procnum = nfsv2_procid[nd->nd_procnum];
665 else
666 procnum = NFSV2PROC_NOOP;
667 }
668
669 /*
670 * Now only used for the R_DONTRECOVER case, but until that is
671 * supported within the krpc code, I need to keep a queue of
672 * outstanding RPCs for nfsv4 client requests.
673 */
674 if ((nd->nd_flag & ND_NFSV4) && procnum == NFSV4PROC_COMPOUND)
675 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq),
676 M_NFSDREQ, M_WAITOK);
677 #ifdef KDTRACE_HOOKS
678 if (dtrace_nfscl_nfs234_start_probe != NULL) {
679 uint32_t probe_id;
680 int probe_procnum;
681
682 if (nd->nd_flag & ND_NFSV4) {
683 probe_id =
684 nfscl_nfs4_start_probes[nd->nd_procnum];
685 probe_procnum = nd->nd_procnum;
686 } else if (nd->nd_flag & ND_NFSV3) {
687 probe_id = nfscl_nfs3_start_probes[procnum];
688 probe_procnum = procnum;
689 } else {
690 probe_id =
691 nfscl_nfs2_start_probes[nd->nd_procnum];
692 probe_procnum = procnum;
693 }
694 if (probe_id != 0)
695 (dtrace_nfscl_nfs234_start_probe)
696 (probe_id, vp, nd->nd_mreq, cred,
697 probe_procnum);
698 }
699 #endif
700 }
701 trycnt = 0;
702 freeslot = -1; /* Set to slot that needs to be free'd */
703 tryagain:
704 slot = -1; /* Slot that needs a sequence# increment. */
705 /*
706 * This timeout specifies when a new socket should be created,
707 * along with new xid values. For UDP, this should be done
708 * infrequently, since retransmits of RPC requests should normally
709 * use the same xid.
710 */
711 if (nmp == NULL) {
712 timo.tv_usec = 0;
713 if (clp == NULL)
714 timo.tv_sec = NFSV4_UPCALLTIMEO;
715 else
716 timo.tv_sec = NFSV4_CALLBACKTIMEO;
717 } else {
718 if (nrp->nr_sotype != SOCK_DGRAM) {
719 timo.tv_usec = 0;
720 if ((nmp->nm_flag & NFSMNT_NFSV4))
721 timo.tv_sec = INT_MAX;
722 else
723 timo.tv_sec = NFS_TCPTIMEO;
724 } else {
725 if (NFSHASSOFT(nmp)) {
726 /*
727 * CLSET_RETRIES is set to 2, so this should be
728 * half of the total timeout required.
729 */
730 timeo = nmp->nm_retry * nmp->nm_timeo / 2;
731 if (timeo < 1)
732 timeo = 1;
733 timo.tv_sec = timeo / NFS_HZ;
734 timo.tv_usec = (timeo % NFS_HZ) * 1000000 /
735 NFS_HZ;
736 } else {
737 /* For UDP hard mounts, use a large value. */
738 timo.tv_sec = NFS_MAXTIMEO / NFS_HZ;
739 timo.tv_usec = 0;
740 }
741 }
742
743 if (rep != NULL) {
744 rep->r_flags = 0;
745 rep->r_nmp = nmp;
746 /*
747 * Chain request into list of outstanding requests.
748 */
749 NFSLOCKREQ();
750 TAILQ_INSERT_TAIL(&nfsd_reqq, rep, r_chain);
751 NFSUNLOCKREQ();
752 }
753 }
754
755 nd->nd_mrep = NULL;
756 if (clp != NULL && sep != NULL)
757 stat = clnt_bck_call(nrp->nr_client, &ext, procnum,
758 nd->nd_mreq, &nd->nd_mrep, timo, sep->nfsess_xprt);
759 else
760 stat = CLNT_CALL_MBUF(nrp->nr_client, &ext, procnum,
761 nd->nd_mreq, &nd->nd_mrep, timo);
762
763 if (rep != NULL) {
764 /*
765 * RPC done, unlink the request.
766 */
767 NFSLOCKREQ();
768 TAILQ_REMOVE(&nfsd_reqq, rep, r_chain);
769 NFSUNLOCKREQ();
770 }
771
772 /*
773 * If there was a successful reply and a tprintf msg.
774 * tprintf a response.
775 */
776 if (stat == RPC_SUCCESS) {
777 error = 0;
778 } else if (stat == RPC_TIMEDOUT) {
779 NFSINCRGLOBAL(nfsstatsv1.rpctimeouts);
780 error = ETIMEDOUT;
781 } else if (stat == RPC_VERSMISMATCH) {
782 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
783 error = EOPNOTSUPP;
784 } else if (stat == RPC_PROGVERSMISMATCH) {
785 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
786 error = EPROTONOSUPPORT;
787 } else if (stat == RPC_INTR) {
788 error = EINTR;
789 } else {
790 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid);
791 error = EACCES;
792 }
793 if (error) {
794 m_freem(nd->nd_mreq);
795 if (usegssname == 0)
796 AUTH_DESTROY(auth);
797 if (rep != NULL)
798 FREE((caddr_t)rep, M_NFSDREQ);
799 if (set_sigset)
800 newnfs_restore_sigmask(td, &oldset);
801 return (error);
802 }
803
804 KASSERT(nd->nd_mrep != NULL, ("mrep shouldn't be NULL if no error\n"));
805
806 /*
807 * Search for any mbufs that are not a multiple of 4 bytes long
808 * or with m_data not longword aligned.
809 * These could cause pointer alignment problems, so copy them to
810 * well aligned mbufs.
811 */
812 newnfs_realign(&nd->nd_mrep, M_WAITOK);
813 nd->nd_md = nd->nd_mrep;
814 nd->nd_dpos = NFSMTOD(nd->nd_md, caddr_t);
815 nd->nd_repstat = 0;
816 if (nd->nd_procnum != NFSPROC_NULL &&
817 nd->nd_procnum != NFSV4PROC_CBNULL) {
818 /* If sep == NULL, set it to the default in nmp. */
819 if (sep == NULL && nmp != NULL)
820 sep = nfsmnt_mdssession(nmp);
821 /*
822 * and now the actual NFS xdr.
823 */
824 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
825 nd->nd_repstat = fxdr_unsigned(u_int32_t, *tl);
826 if (nd->nd_repstat >= 10000)
827 NFSCL_DEBUG(1, "proc=%d reps=%d\n", (int)nd->nd_procnum,
828 (int)nd->nd_repstat);
829
830 /*
831 * Get rid of the tag, return count and SEQUENCE result for
832 * NFSv4.
833 */
834 if ((nd->nd_flag & ND_NFSV4) != 0 && nd->nd_repstat !=
835 NFSERR_MINORVERMISMATCH) {
836 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED);
837 i = fxdr_unsigned(int, *tl);
838 error = nfsm_advance(nd, NFSM_RNDUP(i), -1);
839 if (error)
840 goto nfsmout;
841 NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED);
842 opcnt = fxdr_unsigned(int, *tl++);
843 i = fxdr_unsigned(int, *tl++);
844 j = fxdr_unsigned(int, *tl);
845 if (j >= 10000)
846 NFSCL_DEBUG(1, "fop=%d fst=%d\n", i, j);
847 /*
848 * If the first op is Sequence, free up the slot.
849 */
850 if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) ||
851 (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0))
852 NFSCL_DEBUG(1, "failed seq=%d\n", j);
853 if (((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) ||
854 (clp != NULL && i == NFSV4OP_CBSEQUENCE &&
855 j == 0)) && sep != NULL) {
856 if (i == NFSV4OP_SEQUENCE)
857 NFSM_DISSECT(tl, uint32_t *,
858 NFSX_V4SESSIONID +
859 5 * NFSX_UNSIGNED);
860 else
861 NFSM_DISSECT(tl, uint32_t *,
862 NFSX_V4SESSIONID +
863 4 * NFSX_UNSIGNED);
864 mtx_lock(&sep->nfsess_mtx);
865 if (bcmp(tl, sep->nfsess_sessionid,
866 NFSX_V4SESSIONID) == 0) {
867 tl += NFSX_V4SESSIONID / NFSX_UNSIGNED;
868 retseq = fxdr_unsigned(uint32_t, *tl++);
869 slot = fxdr_unsigned(int, *tl++);
870 freeslot = slot;
871 if (retseq != sep->nfsess_slotseq[slot])
872 printf("retseq diff 0x%x\n",
873 retseq);
874 retval = fxdr_unsigned(uint32_t, *++tl);
875 if ((retval + 1) < sep->nfsess_foreslots
876 )
877 sep->nfsess_foreslots = (retval
878 + 1);
879 else if ((retval + 1) >
880 sep->nfsess_foreslots)
881 sep->nfsess_foreslots = (retval
882 < 64) ? (retval + 1) : 64;
883 }
884 mtx_unlock(&sep->nfsess_mtx);
885
886 /* Grab the op and status for the next one. */
887 if (opcnt > 1) {
888 NFSM_DISSECT(tl, uint32_t *,
889 2 * NFSX_UNSIGNED);
890 i = fxdr_unsigned(int, *tl++);
891 j = fxdr_unsigned(int, *tl);
892 }
893 }
894 }
895 if (nd->nd_repstat != 0) {
896 if (nd->nd_repstat == NFSERR_BADSESSION &&
897 nmp != NULL && dssep == NULL &&
898 (nd->nd_flag & ND_NFSV41) != 0) {
899 /*
900 * If this is a client side MDS RPC, mark
901 * the MDS session defunct and initiate
902 * recovery, as required.
903 * The nfsess_defunct field is protected by
904 * the NFSLOCKMNT()/nm_mtx lock and not the
905 * nfsess_mtx lock to simplify its handling,
906 * for the MDS session. This lock is also
907 * sufficient for nfsess_sessionid, since it
908 * never changes in the structure.
909 */
910 NFSCL_DEBUG(1, "Got badsession\n");
911 NFSLOCKCLSTATE();
912 NFSLOCKMNT(nmp);
913 sep = NFSMNT_MDSSESSION(nmp);
914 if (bcmp(sep->nfsess_sessionid, nd->nd_sequence,
915 NFSX_V4SESSIONID) == 0) {
916 /* Initiate recovery. */
917 sep->nfsess_defunct = 1;
918 NFSCL_DEBUG(1, "Marked defunct\n");
919 if (nmp->nm_clp != NULL) {
920 nmp->nm_clp->nfsc_flags |=
921 NFSCLFLAGS_RECOVER;
922 wakeup(nmp->nm_clp);
923 }
924 }
925 NFSUNLOCKCLSTATE();
926 /*
927 * Sleep for up to 1sec waiting for a new
928 * session.
929 */
930 mtx_sleep(&nmp->nm_sess, &nmp->nm_mtx, PZERO,
931 "nfsbadsess", hz);
932 /*
933 * Get the session again, in case a new one
934 * has been created during the sleep.
935 */
936 sep = NFSMNT_MDSSESSION(nmp);
937 NFSUNLOCKMNT(nmp);
938 if ((nd->nd_flag & ND_LOOPBADSESS) != 0) {
939 reterr = nfsv4_sequencelookup(nmp, sep,
940 &slotpos, &maxslot, &slotseq,
941 sessionid);
942 if (reterr == 0) {
943 /* Fill in new session info. */
944 NFSCL_DEBUG(1,
945 "Filling in new sequence\n");
946 tl = nd->nd_sequence;
947 bcopy(sessionid, tl,
948 NFSX_V4SESSIONID);
949 tl += NFSX_V4SESSIONID /
950 NFSX_UNSIGNED;
951 *tl++ = txdr_unsigned(slotseq);
952 *tl++ = txdr_unsigned(slotpos);
953 *tl = txdr_unsigned(maxslot);
954 }
955 if (reterr == NFSERR_BADSESSION ||
956 reterr == 0) {
957 NFSCL_DEBUG(1,
958 "Badsession looping\n");
959 m_freem(nd->nd_mrep);
960 nd->nd_mrep = NULL;
961 goto tryagain;
962 }
963 nd->nd_repstat = reterr;
964 NFSCL_DEBUG(1, "Got err=%d\n", reterr);
965 }
966 }
967 /*
968 * When clp != NULL, it is a callback and all
969 * callback operations can be retried for NFSERR_DELAY.
970 */
971 if (((nd->nd_repstat == NFSERR_DELAY ||
972 nd->nd_repstat == NFSERR_GRACE) &&
973 (nd->nd_flag & ND_NFSV4) && (clp != NULL ||
974 (nd->nd_procnum != NFSPROC_DELEGRETURN &&
975 nd->nd_procnum != NFSPROC_SETATTR &&
976 nd->nd_procnum != NFSPROC_READ &&
977 nd->nd_procnum != NFSPROC_READDS &&
978 nd->nd_procnum != NFSPROC_WRITE &&
979 nd->nd_procnum != NFSPROC_WRITEDS &&
980 nd->nd_procnum != NFSPROC_OPEN &&
981 nd->nd_procnum != NFSPROC_CREATE &&
982 nd->nd_procnum != NFSPROC_OPENCONFIRM &&
983 nd->nd_procnum != NFSPROC_OPENDOWNGRADE &&
984 nd->nd_procnum != NFSPROC_CLOSE &&
985 nd->nd_procnum != NFSPROC_LOCK &&
986 nd->nd_procnum != NFSPROC_LOCKU))) ||
987 (nd->nd_repstat == NFSERR_DELAY &&
988 (nd->nd_flag & ND_NFSV4) == 0) ||
989 nd->nd_repstat == NFSERR_RESOURCE) {
990 if (trylater_delay > NFS_TRYLATERDEL)
991 trylater_delay = NFS_TRYLATERDEL;
992 waituntil = NFSD_MONOSEC + trylater_delay;
993 while (NFSD_MONOSEC < waituntil)
994 (void) nfs_catnap(PZERO, 0, "nfstry");
995 trylater_delay *= 2;
996 if (slot != -1) {
997 mtx_lock(&sep->nfsess_mtx);
998 sep->nfsess_slotseq[slot]++;
999 *nd->nd_slotseq = txdr_unsigned(
1000 sep->nfsess_slotseq[slot]);
1001 mtx_unlock(&sep->nfsess_mtx);
1002 }
1003 m_freem(nd->nd_mrep);
1004 nd->nd_mrep = NULL;
1005 goto tryagain;
1006 }
1007
1008 /*
1009 * If the File Handle was stale, invalidate the
1010 * lookup cache, just in case.
1011 * (vp != NULL implies a client side call)
1012 */
1013 if (nd->nd_repstat == ESTALE && vp != NULL) {
1014 cache_purge(vp);
1015 if (ncl_call_invalcaches != NULL)
1016 (*ncl_call_invalcaches)(vp);
1017 }
1018 }
1019 if ((nd->nd_flag & ND_NFSV4) != 0) {
1020 /* Free the slot, as required. */
1021 if (freeslot != -1)
1022 nfsv4_freeslot(sep, freeslot);
1023 /*
1024 * If this op is Putfh, throw its results away.
1025 */
1026 if (j >= 10000)
1027 NFSCL_DEBUG(1, "nop=%d nst=%d\n", i, j);
1028 if (nmp != NULL && i == NFSV4OP_PUTFH && j == 0) {
1029 NFSM_DISSECT(tl,u_int32_t *,2 * NFSX_UNSIGNED);
1030 i = fxdr_unsigned(int, *tl++);
1031 j = fxdr_unsigned(int, *tl);
1032 if (j >= 10000)
1033 NFSCL_DEBUG(1, "n2op=%d n2st=%d\n", i,
1034 j);
1035 /*
1036 * All Compounds that do an Op that must
1037 * be in sequence consist of NFSV4OP_PUTFH
1038 * followed by one of these. As such, we
1039 * can determine if the seqid# should be
1040 * incremented, here.
1041 */
1042 if ((i == NFSV4OP_OPEN ||
1043 i == NFSV4OP_OPENCONFIRM ||
1044 i == NFSV4OP_OPENDOWNGRADE ||
1045 i == NFSV4OP_CLOSE ||
1046 i == NFSV4OP_LOCK ||
1047 i == NFSV4OP_LOCKU) &&
1048 (j == 0 ||
1049 (j != NFSERR_STALECLIENTID &&
1050 j != NFSERR_STALESTATEID &&
1051 j != NFSERR_BADSTATEID &&
1052 j != NFSERR_BADSEQID &&
1053 j != NFSERR_BADXDR &&
1054 j != NFSERR_RESOURCE &&
1055 j != NFSERR_NOFILEHANDLE)))
1056 nd->nd_flag |= ND_INCRSEQID;
1057 }
1058 /*
1059 * If this op's status is non-zero, mark
1060 * that there is no more data to process.
1061 * The exception is Setattr, which always has xdr
1062 * when it has failed.
1063 */
1064 if (j != 0 && i != NFSV4OP_SETATTR)
1065 nd->nd_flag |= ND_NOMOREDATA;
1066
1067 /*
1068 * If R_DONTRECOVER is set, replace the stale error
1069 * reply, so that recovery isn't initiated.
1070 */
1071 if ((nd->nd_repstat == NFSERR_STALECLIENTID ||
1072 nd->nd_repstat == NFSERR_BADSESSION ||
1073 nd->nd_repstat == NFSERR_STALESTATEID) &&
1074 rep != NULL && (rep->r_flags & R_DONTRECOVER))
1075 nd->nd_repstat = NFSERR_STALEDONTRECOVER;
1076 }
1077 }
1078
1079 #ifdef KDTRACE_HOOKS
1080 if (nmp != NULL && dtrace_nfscl_nfs234_done_probe != NULL) {
1081 uint32_t probe_id;
1082 int probe_procnum;
1083
1084 if (nd->nd_flag & ND_NFSV4) {
1085 probe_id = nfscl_nfs4_done_probes[nd->nd_procnum];
1086 probe_procnum = nd->nd_procnum;
1087 } else if (nd->nd_flag & ND_NFSV3) {
1088 probe_id = nfscl_nfs3_done_probes[procnum];
1089 probe_procnum = procnum;
1090 } else {
1091 probe_id = nfscl_nfs2_done_probes[nd->nd_procnum];
1092 probe_procnum = procnum;
1093 }
1094 if (probe_id != 0)
1095 (dtrace_nfscl_nfs234_done_probe)(probe_id, vp,
1096 nd->nd_mreq, cred, probe_procnum, 0);
1097 }
1098 #endif
1099
1100 m_freem(nd->nd_mreq);
1101 if (usegssname == 0)
1102 AUTH_DESTROY(auth);
1103 if (rep != NULL)
1104 FREE((caddr_t)rep, M_NFSDREQ);
1105 if (set_sigset)
1106 newnfs_restore_sigmask(td, &oldset);
1107 return (0);
1108 nfsmout:
1109 mbuf_freem(nd->nd_mrep);
1110 mbuf_freem(nd->nd_mreq);
1111 if (usegssname == 0)
1112 AUTH_DESTROY(auth);
1113 if (rep != NULL)
1114 FREE((caddr_t)rep, M_NFSDREQ);
1115 if (set_sigset)
1116 newnfs_restore_sigmask(td, &oldset);
1117 return (error);
1118 }
1119
1120 /*
1121 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and
1122 * wait for all requests to complete. This is used by forced unmounts
1123 * to terminate any outstanding RPCs.
1124 */
1125 int
newnfs_nmcancelreqs(struct nfsmount * nmp)1126 newnfs_nmcancelreqs(struct nfsmount *nmp)
1127 {
1128 struct nfsclds *dsp;
1129 struct __rpc_client *cl;
1130
1131 if (nmp->nm_sockreq.nr_client != NULL)
1132 CLNT_CLOSE(nmp->nm_sockreq.nr_client);
1133 lookformore:
1134 NFSLOCKMNT(nmp);
1135 TAILQ_FOREACH(dsp, &nmp->nm_sess, nfsclds_list) {
1136 NFSLOCKDS(dsp);
1137 if (dsp != TAILQ_FIRST(&nmp->nm_sess) &&
1138 (dsp->nfsclds_flags & NFSCLDS_CLOSED) == 0 &&
1139 dsp->nfsclds_sockp != NULL &&
1140 dsp->nfsclds_sockp->nr_client != NULL) {
1141 dsp->nfsclds_flags |= NFSCLDS_CLOSED;
1142 cl = dsp->nfsclds_sockp->nr_client;
1143 NFSUNLOCKDS(dsp);
1144 NFSUNLOCKMNT(nmp);
1145 CLNT_CLOSE(cl);
1146 goto lookformore;
1147 }
1148 NFSUNLOCKDS(dsp);
1149 }
1150 NFSUNLOCKMNT(nmp);
1151 return (0);
1152 }
1153
1154 /*
1155 * Any signal that can interrupt an NFS operation in an intr mount
1156 * should be added to this set. SIGSTOP and SIGKILL cannot be masked.
1157 */
1158 int newnfs_sig_set[] = {
1159 SIGINT,
1160 SIGTERM,
1161 SIGHUP,
1162 SIGKILL,
1163 SIGQUIT
1164 };
1165
1166 /*
1167 * Check to see if one of the signals in our subset is pending on
1168 * the process (in an intr mount).
1169 */
1170 static int
nfs_sig_pending(sigset_t set)1171 nfs_sig_pending(sigset_t set)
1172 {
1173 int i;
1174
1175 for (i = 0 ; i < nitems(newnfs_sig_set); i++)
1176 if (SIGISMEMBER(set, newnfs_sig_set[i]))
1177 return (1);
1178 return (0);
1179 }
1180
1181 /*
1182 * The set/restore sigmask functions are used to (temporarily) overwrite
1183 * the thread td_sigmask during an RPC call (for example). These are also
1184 * used in other places in the NFS client that might tsleep().
1185 */
1186 void
newnfs_set_sigmask(struct thread * td,sigset_t * oldset)1187 newnfs_set_sigmask(struct thread *td, sigset_t *oldset)
1188 {
1189 sigset_t newset;
1190 int i;
1191 struct proc *p;
1192
1193 SIGFILLSET(newset);
1194 if (td == NULL)
1195 td = curthread; /* XXX */
1196 p = td->td_proc;
1197 /* Remove the NFS set of signals from newset */
1198 PROC_LOCK(p);
1199 mtx_lock(&p->p_sigacts->ps_mtx);
1200 for (i = 0 ; i < nitems(newnfs_sig_set); i++) {
1201 /*
1202 * But make sure we leave the ones already masked
1203 * by the process, ie. remove the signal from the
1204 * temporary signalmask only if it wasn't already
1205 * in p_sigmask.
1206 */
1207 if (!SIGISMEMBER(td->td_sigmask, newnfs_sig_set[i]) &&
1208 !SIGISMEMBER(p->p_sigacts->ps_sigignore, newnfs_sig_set[i]))
1209 SIGDELSET(newset, newnfs_sig_set[i]);
1210 }
1211 mtx_unlock(&p->p_sigacts->ps_mtx);
1212 kern_sigprocmask(td, SIG_SETMASK, &newset, oldset,
1213 SIGPROCMASK_PROC_LOCKED);
1214 PROC_UNLOCK(p);
1215 }
1216
1217 void
newnfs_restore_sigmask(struct thread * td,sigset_t * set)1218 newnfs_restore_sigmask(struct thread *td, sigset_t *set)
1219 {
1220 if (td == NULL)
1221 td = curthread; /* XXX */
1222 kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0);
1223 }
1224
1225 /*
1226 * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the
1227 * old one after msleep() returns.
1228 */
1229 int
newnfs_msleep(struct thread * td,void * ident,struct mtx * mtx,int priority,char * wmesg,int timo)1230 newnfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo)
1231 {
1232 sigset_t oldset;
1233 int error;
1234 struct proc *p;
1235
1236 if ((priority & PCATCH) == 0)
1237 return msleep(ident, mtx, priority, wmesg, timo);
1238 if (td == NULL)
1239 td = curthread; /* XXX */
1240 newnfs_set_sigmask(td, &oldset);
1241 error = msleep(ident, mtx, priority, wmesg, timo);
1242 newnfs_restore_sigmask(td, &oldset);
1243 p = td->td_proc;
1244 return (error);
1245 }
1246
1247 /*
1248 * Test for a termination condition pending on the process.
1249 * This is used for NFSMNT_INT mounts.
1250 */
1251 int
newnfs_sigintr(struct nfsmount * nmp,struct thread * td)1252 newnfs_sigintr(struct nfsmount *nmp, struct thread *td)
1253 {
1254 struct proc *p;
1255 sigset_t tmpset;
1256
1257 /* Terminate all requests while attempting a forced unmount. */
1258 if (NFSCL_FORCEDISM(nmp->nm_mountp))
1259 return (EIO);
1260 if (!(nmp->nm_flag & NFSMNT_INT))
1261 return (0);
1262 if (td == NULL)
1263 return (0);
1264 p = td->td_proc;
1265 PROC_LOCK(p);
1266 tmpset = p->p_siglist;
1267 SIGSETOR(tmpset, td->td_siglist);
1268 SIGSETNAND(tmpset, td->td_sigmask);
1269 mtx_lock(&p->p_sigacts->ps_mtx);
1270 SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore);
1271 mtx_unlock(&p->p_sigacts->ps_mtx);
1272 if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist))
1273 && nfs_sig_pending(tmpset)) {
1274 PROC_UNLOCK(p);
1275 return (EINTR);
1276 }
1277 PROC_UNLOCK(p);
1278 return (0);
1279 }
1280
1281 static int
nfs_msg(struct thread * td,const char * server,const char * msg,int error)1282 nfs_msg(struct thread *td, const char *server, const char *msg, int error)
1283 {
1284 struct proc *p;
1285
1286 p = td ? td->td_proc : NULL;
1287 if (error) {
1288 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n",
1289 server, msg, error);
1290 } else {
1291 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg);
1292 }
1293 return (0);
1294 }
1295
1296 static void
nfs_down(struct nfsmount * nmp,struct thread * td,const char * msg,int error,int flags)1297 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg,
1298 int error, int flags)
1299 {
1300 if (nmp == NULL)
1301 return;
1302 mtx_lock(&nmp->nm_mtx);
1303 if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) {
1304 nmp->nm_state |= NFSSTA_TIMEO;
1305 mtx_unlock(&nmp->nm_mtx);
1306 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1307 VQ_NOTRESP, 0);
1308 } else
1309 mtx_unlock(&nmp->nm_mtx);
1310 mtx_lock(&nmp->nm_mtx);
1311 if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1312 nmp->nm_state |= NFSSTA_LOCKTIMEO;
1313 mtx_unlock(&nmp->nm_mtx);
1314 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1315 VQ_NOTRESPLOCK, 0);
1316 } else
1317 mtx_unlock(&nmp->nm_mtx);
1318 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error);
1319 }
1320
1321 static void
nfs_up(struct nfsmount * nmp,struct thread * td,const char * msg,int flags,int tprintfmsg)1322 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg,
1323 int flags, int tprintfmsg)
1324 {
1325 if (nmp == NULL)
1326 return;
1327 if (tprintfmsg) {
1328 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0);
1329 }
1330
1331 mtx_lock(&nmp->nm_mtx);
1332 if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) {
1333 nmp->nm_state &= ~NFSSTA_TIMEO;
1334 mtx_unlock(&nmp->nm_mtx);
1335 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1336 VQ_NOTRESP, 1);
1337 } else
1338 mtx_unlock(&nmp->nm_mtx);
1339
1340 mtx_lock(&nmp->nm_mtx);
1341 if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) {
1342 nmp->nm_state &= ~NFSSTA_LOCKTIMEO;
1343 mtx_unlock(&nmp->nm_mtx);
1344 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid,
1345 VQ_NOTRESPLOCK, 1);
1346 } else
1347 mtx_unlock(&nmp->nm_mtx);
1348 }
1349
1350