Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/nfs/nfs_commonkrpc.c
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1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1991, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 */ 35 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 /* 40 * Socket operations for use by nfs 41 */ 42 43 #include "opt_kgssapi.h" 44 #include "opt_nfs.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/kernel.h> 49 #include <sys/limits.h> 50 #include <sys/lock.h> 51 #include <sys/malloc.h> 52 #include <sys/mbuf.h> 53 #include <sys/mount.h> 54 #include <sys/mutex.h> 55 #include <sys/proc.h> 56 #include <sys/signalvar.h> 57 #include <sys/syscallsubr.h> 58 #include <sys/sysctl.h> 59 #include <sys/syslog.h> 60 #include <sys/vnode.h> 61 62 #include <rpc/rpc.h> 63 #include <rpc/krpc.h> 64 65 #include <kgssapi/krb5/kcrypto.h> 66 67 #include <fs/nfs/nfsport.h> 68 69 #ifdef KDTRACE_HOOKS 70 #include <sys/dtrace_bsd.h> 71 72 dtrace_nfsclient_nfs23_start_probe_func_t 73 dtrace_nfscl_nfs234_start_probe; 74 75 dtrace_nfsclient_nfs23_done_probe_func_t 76 dtrace_nfscl_nfs234_done_probe; 77 78 /* 79 * Registered probes by RPC type. 80 */ 81 uint32_t nfscl_nfs2_start_probes[NFSV41_NPROCS + 1]; 82 uint32_t nfscl_nfs2_done_probes[NFSV41_NPROCS + 1]; 83 84 uint32_t nfscl_nfs3_start_probes[NFSV41_NPROCS + 1]; 85 uint32_t nfscl_nfs3_done_probes[NFSV41_NPROCS + 1]; 86 87 uint32_t nfscl_nfs4_start_probes[NFSV41_NPROCS + 1]; 88 uint32_t nfscl_nfs4_done_probes[NFSV41_NPROCS + 1]; 89 #endif 90 91 NFSSTATESPINLOCK; 92 NFSREQSPINLOCK; 93 NFSDLOCKMUTEX; 94 NFSCLSTATEMUTEX; 95 extern struct nfsstatsv1 nfsstatsv1; 96 extern struct nfsreqhead nfsd_reqq; 97 extern int nfscl_ticks; 98 extern void (*ncl_call_invalcaches)(struct vnode *); 99 extern int nfs_numnfscbd; 100 extern int nfscl_debuglevel; 101 extern int nfsrv_lease; 102 103 SVCPOOL *nfscbd_pool; 104 int nfs_bufpackets = 4; 105 static int nfsrv_gsscallbackson = 0; 106 static int nfs_reconnects; 107 static int nfs3_jukebox_delay = 10; 108 static int nfs_skip_wcc_data_onerr = 1; 109 static int nfs_dsretries = 2; 110 static struct timespec nfs_trylater_max = { 111 .tv_sec = NFS_TRYLATERDEL, 112 .tv_nsec = 0, 113 }; 114 115 SYSCTL_DECL(_vfs_nfs); 116 117 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, 118 "Buffer reservation size 2 < x < 64"); 119 SYSCTL_INT(_vfs_nfs, OID_AUTO, reconnects, CTLFLAG_RD, &nfs_reconnects, 0, 120 "Number of times the nfs client has had to reconnect"); 121 SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs3_jukebox_delay, CTLFLAG_RW, &nfs3_jukebox_delay, 0, 122 "Number of seconds to delay a retry after receiving EJUKEBOX"); 123 SYSCTL_INT(_vfs_nfs, OID_AUTO, skip_wcc_data_onerr, CTLFLAG_RW, &nfs_skip_wcc_data_onerr, 0, 124 "Disable weak cache consistency checking when server returns an error"); 125 SYSCTL_INT(_vfs_nfs, OID_AUTO, dsretries, CTLFLAG_RW, &nfs_dsretries, 0, 126 "Number of retries for a DS RPC before failure"); 127 128 static void nfs_down(struct nfsmount *, struct thread *, const char *, 129 int, int); 130 static void nfs_up(struct nfsmount *, struct thread *, const char *, 131 int, int); 132 static int nfs_msg(struct thread *, const char *, const char *, int); 133 134 struct nfs_cached_auth { 135 int ca_refs; /* refcount, including 1 from the cache */ 136 uid_t ca_uid; /* uid that corresponds to this auth */ 137 AUTH *ca_auth; /* RPC auth handle */ 138 }; 139 140 static int nfsv2_procid[NFS_V3NPROCS] = { 141 NFSV2PROC_NULL, 142 NFSV2PROC_GETATTR, 143 NFSV2PROC_SETATTR, 144 NFSV2PROC_LOOKUP, 145 NFSV2PROC_NOOP, 146 NFSV2PROC_READLINK, 147 NFSV2PROC_READ, 148 NFSV2PROC_WRITE, 149 NFSV2PROC_CREATE, 150 NFSV2PROC_MKDIR, 151 NFSV2PROC_SYMLINK, 152 NFSV2PROC_CREATE, 153 NFSV2PROC_REMOVE, 154 NFSV2PROC_RMDIR, 155 NFSV2PROC_RENAME, 156 NFSV2PROC_LINK, 157 NFSV2PROC_READDIR, 158 NFSV2PROC_NOOP, 159 NFSV2PROC_STATFS, 160 NFSV2PROC_NOOP, 161 NFSV2PROC_NOOP, 162 NFSV2PROC_NOOP, 163 }; 164 165 /* 166 * Initialize sockets and congestion for a new NFS connection. 167 * We do not free the sockaddr if error. 168 * Which arguments are set to NULL indicate what kind of call it is. 169 * cred == NULL --> a call to connect to a pNFS DS 170 * nmp == NULL --> indicates an upcall to userland or a NFSv4.0 callback 171 */ 172 int 173 newnfs_connect(struct nfsmount *nmp, struct nfssockreq *nrp, 174 struct ucred *cred, NFSPROC_T *p, int callback_retry_mult, bool dotls, 175 struct __rpc_client **clipp) 176 { 177 int rcvreserve, sndreserve; 178 int pktscale, pktscalesav; 179 struct sockaddr *saddr; 180 struct ucred *origcred; 181 CLIENT *client; 182 struct netconfig *nconf; 183 struct socket *so; 184 int one = 1, retries, error = 0; 185 struct thread *td = curthread; 186 SVCXPRT *xprt; 187 struct timeval timo; 188 uint64_t tval; 189 190 /* 191 * We need to establish the socket using the credentials of 192 * the mountpoint. Some parts of this process (such as 193 * sobind() and soconnect()) will use the curent thread's 194 * credential instead of the socket credential. To work 195 * around this, temporarily change the current thread's 196 * credential to that of the mountpoint. 197 * 198 * XXX: It would be better to explicitly pass the correct 199 * credential to sobind() and soconnect(). 200 */ 201 origcred = td->td_ucred; 202 203 /* 204 * Use the credential in nr_cred, if not NULL. 205 */ 206 if (nrp->nr_cred != NULL) 207 td->td_ucred = nrp->nr_cred; 208 else 209 td->td_ucred = cred; 210 saddr = nrp->nr_nam; 211 212 if (saddr->sa_family == AF_INET) 213 if (nrp->nr_sotype == SOCK_DGRAM) 214 nconf = getnetconfigent("udp"); 215 else 216 nconf = getnetconfigent("tcp"); 217 else 218 if (nrp->nr_sotype == SOCK_DGRAM) 219 nconf = getnetconfigent("udp6"); 220 else 221 nconf = getnetconfigent("tcp6"); 222 223 pktscale = nfs_bufpackets; 224 if (pktscale < 2) 225 pktscale = 2; 226 if (pktscale > 64) 227 pktscale = 64; 228 pktscalesav = pktscale; 229 /* 230 * soreserve() can fail if sb_max is too small, so shrink pktscale 231 * and try again if there is an error. 232 * Print a log message suggesting increasing sb_max. 233 * Creating a socket and doing this is necessary since, if the 234 * reservation sizes are too large and will make soreserve() fail, 235 * the connection will work until a large send is attempted and 236 * then it will loop in the krpc code. 237 */ 238 so = NULL; 239 saddr = NFSSOCKADDR(nrp->nr_nam, struct sockaddr *); 240 error = socreate(saddr->sa_family, &so, nrp->nr_sotype, 241 nrp->nr_soproto, td->td_ucred, td); 242 if (error != 0) 243 goto out; 244 do { 245 if (error != 0 && pktscale > 2) { 246 if (nmp != NULL && nrp->nr_sotype == SOCK_STREAM && 247 pktscale == pktscalesav) { 248 /* 249 * Suggest vfs.nfs.bufpackets * maximum RPC message, 250 * adjusted for the sb_max->sb_max_adj conversion of 251 * MCLBYTES / (MSIZE + MCLBYTES) as the minimum setting 252 * for kern.ipc.maxsockbuf. 253 */ 254 tval = (NFS_MAXBSIZE + NFS_MAXXDR) * nfs_bufpackets; 255 tval *= MSIZE + MCLBYTES; 256 tval += MCLBYTES - 1; /* Round up divide by MCLBYTES. */ 257 tval /= MCLBYTES; 258 printf("Consider increasing kern.ipc.maxsockbuf to a " 259 "minimum of %ju to support %ubyte NFS I/O\n", 260 (uintmax_t)tval, NFS_MAXBSIZE); 261 } 262 pktscale--; 263 } 264 if (nrp->nr_sotype == SOCK_DGRAM) { 265 if (nmp != NULL) { 266 sndreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) * 267 pktscale; 268 rcvreserve = (NFS_MAXDGRAMDATA + NFS_MAXPKTHDR) * 269 pktscale; 270 } else { 271 sndreserve = rcvreserve = 1024 * pktscale; 272 } 273 } else { 274 if (nrp->nr_sotype != SOCK_STREAM) 275 panic("nfscon sotype"); 276 if (nmp != NULL) { 277 sndreserve = (NFS_MAXBSIZE + NFS_MAXXDR) * 278 pktscale; 279 rcvreserve = (NFS_MAXBSIZE + NFS_MAXXDR) * 280 pktscale; 281 } else { 282 sndreserve = rcvreserve = 1024 * pktscale; 283 } 284 } 285 error = soreserve(so, sndreserve, rcvreserve); 286 if (error != 0 && nmp != NULL && nrp->nr_sotype == SOCK_STREAM && 287 pktscale <= 2) 288 printf("Must increase kern.ipc.maxsockbuf or reduce" 289 " rsize, wsize\n"); 290 } while (error != 0 && pktscale > 2); 291 soclose(so); 292 if (error != 0) 293 goto out; 294 295 client = clnt_reconnect_create(nconf, saddr, nrp->nr_prog, 296 nrp->nr_vers, sndreserve, rcvreserve); 297 CLNT_CONTROL(client, CLSET_WAITCHAN, "nfsreq"); 298 if (nmp != NULL) { 299 if ((nmp->nm_flag & NFSMNT_INT)) 300 CLNT_CONTROL(client, CLSET_INTERRUPTIBLE, &one); 301 if ((nmp->nm_flag & NFSMNT_RESVPORT)) 302 CLNT_CONTROL(client, CLSET_PRIVPORT, &one); 303 if (NFSHASTLS(nmp)) { 304 CLNT_CONTROL(client, CLSET_TLS, &one); 305 if (nmp->nm_tlscertname != NULL) 306 CLNT_CONTROL(client, CLSET_TLSCERTNAME, 307 nmp->nm_tlscertname); 308 } 309 if (NFSHASSOFT(nmp)) { 310 if (nmp->nm_sotype == SOCK_DGRAM) 311 /* 312 * For UDP, the large timeout for a reconnect 313 * will be set to "nm_retry * nm_timeo / 2", so 314 * we only want to do 2 reconnect timeout 315 * retries. 316 */ 317 retries = 2; 318 else 319 retries = nmp->nm_retry; 320 } else 321 retries = INT_MAX; 322 if (NFSHASNFSV4N(nmp)) { 323 if (cred != NULL) { 324 if (NFSHASSOFT(nmp)) { 325 /* 326 * This should be a DS mount. 327 * Use CLSET_TIMEOUT to set the timeout 328 * for connections to DSs instead of 329 * specifying a timeout on each RPC. 330 * This is done so that SO_SNDTIMEO 331 * is set on the TCP socket as well 332 * as specifying a time limit when 333 * waiting for an RPC reply. Useful 334 * if the send queue for the TCP 335 * connection has become constipated, 336 * due to a failed DS. 337 * The choice of lease_duration / 4 is 338 * fairly arbitrary, but seems to work 339 * ok, with a lower bound of 10sec. 340 */ 341 timo.tv_sec = nfsrv_lease / 4; 342 if (timo.tv_sec < 10) 343 timo.tv_sec = 10; 344 timo.tv_usec = 0; 345 CLNT_CONTROL(client, CLSET_TIMEOUT, 346 &timo); 347 } 348 /* 349 * Make sure the nfscbd_pool doesn't get 350 * destroyed while doing this. 351 */ 352 NFSD_LOCK(); 353 if (nfs_numnfscbd > 0) { 354 nfs_numnfscbd++; 355 NFSD_UNLOCK(); 356 xprt = svc_vc_create_backchannel( 357 nfscbd_pool); 358 CLNT_CONTROL(client, CLSET_BACKCHANNEL, 359 xprt); 360 NFSD_LOCK(); 361 nfs_numnfscbd--; 362 if (nfs_numnfscbd == 0) 363 wakeup(&nfs_numnfscbd); 364 } 365 NFSD_UNLOCK(); 366 } else { 367 /* 368 * cred == NULL for a DS connect. 369 * For connects to a DS, set a retry limit 370 * so that failed DSs will be detected. 371 * This is ok for NFSv4.1, since a DS does 372 * not maintain open/lock state and is the 373 * only case where using a "soft" mount is 374 * recommended for NFSv4. 375 * For mounts from the MDS to DS, this is done 376 * via mount options, but that is not the case 377 * here. The retry limit here can be adjusted 378 * via the sysctl vfs.nfs.dsretries. 379 * See the comment above w.r.t. timeout. 380 */ 381 timo.tv_sec = nfsrv_lease / 4; 382 if (timo.tv_sec < 10) 383 timo.tv_sec = 10; 384 timo.tv_usec = 0; 385 CLNT_CONTROL(client, CLSET_TIMEOUT, &timo); 386 retries = nfs_dsretries; 387 } 388 } 389 } else { 390 /* 391 * Three cases: 392 * - Null RPC callback to client 393 * - Non-Null RPC callback to client, wait a little longer 394 * - upcalls to nfsuserd and gssd (clp == NULL) 395 */ 396 if (callback_retry_mult == 0) { 397 retries = NFSV4_UPCALLRETRY; 398 CLNT_CONTROL(client, CLSET_PRIVPORT, &one); 399 } else { 400 retries = NFSV4_CALLBACKRETRY * callback_retry_mult; 401 } 402 if (dotls) 403 CLNT_CONTROL(client, CLSET_TLS, &one); 404 } 405 CLNT_CONTROL(client, CLSET_RETRIES, &retries); 406 407 if (nmp != NULL) { 408 /* 409 * For UDP, there are 2 timeouts: 410 * - CLSET_RETRY_TIMEOUT sets the initial timeout for the timer 411 * that does a retransmit of an RPC request using the same 412 * socket and xid. This is what you normally want to do, 413 * since NFS servers depend on "same xid" for their 414 * Duplicate Request Cache. 415 * - timeout specified in CLNT_CALL_MBUF(), which specifies when 416 * retransmits on the same socket should fail and a fresh 417 * socket created. Each of these timeouts counts as one 418 * CLSET_RETRIES as set above. 419 * Set the initial retransmit timeout for UDP. This timeout 420 * doesn't exist for TCP and the following call just fails, 421 * which is ok. 422 */ 423 timo.tv_sec = nmp->nm_timeo / NFS_HZ; 424 timo.tv_usec = (nmp->nm_timeo % NFS_HZ) * 1000000 / NFS_HZ; 425 CLNT_CONTROL(client, CLSET_RETRY_TIMEOUT, &timo); 426 } 427 428 /* 429 * *clipp is &nrp->nr_client or &nm_aconn[nmp->nm_nextaconn]. 430 * The latter case is for additional connections specified by the 431 * "nconnect" mount option. nr_mtx etc is used for these additional 432 * connections, as well as nr_client in the nfssockreq 433 * structure for the mount. 434 */ 435 mtx_lock(&nrp->nr_mtx); 436 if (*clipp != NULL) { 437 mtx_unlock(&nrp->nr_mtx); 438 /* 439 * Someone else already connected. 440 */ 441 CLNT_RELEASE(client); 442 } else { 443 *clipp = client; 444 /* 445 * Protocols that do not require connections may be optionally 446 * left unconnected for servers that reply from a port other 447 * than NFS_PORT. 448 */ 449 if (nmp == NULL || (nmp->nm_flag & NFSMNT_NOCONN) == 0) { 450 mtx_unlock(&nrp->nr_mtx); 451 CLNT_CONTROL(client, CLSET_CONNECT, &one); 452 } else 453 mtx_unlock(&nrp->nr_mtx); 454 } 455 456 out: 457 /* Restore current thread's credentials. */ 458 td->td_ucred = origcred; 459 460 NFSEXITCODE(error); 461 return (error); 462 } 463 464 /* 465 * NFS disconnect. Clean up and unlink. 466 */ 467 void 468 newnfs_disconnect(struct nfsmount *nmp, struct nfssockreq *nrp) 469 { 470 CLIENT *client, *aconn[NFS_MAXNCONN - 1]; 471 int i; 472 473 mtx_lock(&nrp->nr_mtx); 474 if (nrp->nr_client != NULL) { 475 client = nrp->nr_client; 476 nrp->nr_client = NULL; 477 if (nmp != NULL && nmp->nm_aconnect > 0) { 478 for (i = 0; i < nmp->nm_aconnect; i++) { 479 aconn[i] = nmp->nm_aconn[i]; 480 nmp->nm_aconn[i] = NULL; 481 } 482 } 483 mtx_unlock(&nrp->nr_mtx); 484 rpc_gss_secpurge_call(client); 485 CLNT_CLOSE(client); 486 CLNT_RELEASE(client); 487 if (nmp != NULL && nmp->nm_aconnect > 0) { 488 for (i = 0; i < nmp->nm_aconnect; i++) { 489 if (aconn[i] != NULL) { 490 rpc_gss_secpurge_call(aconn[i]); 491 CLNT_CLOSE(aconn[i]); 492 CLNT_RELEASE(aconn[i]); 493 } 494 } 495 } 496 } else { 497 mtx_unlock(&nrp->nr_mtx); 498 } 499 } 500 501 static AUTH * 502 nfs_getauth(struct nfssockreq *nrp, int secflavour, char *clnt_principal, 503 char *srv_principal, gss_OID mech_oid, struct ucred *cred) 504 { 505 rpc_gss_service_t svc; 506 AUTH *auth; 507 508 switch (secflavour) { 509 case RPCSEC_GSS_KRB5: 510 case RPCSEC_GSS_KRB5I: 511 case RPCSEC_GSS_KRB5P: 512 if (!mech_oid) { 513 if (!rpc_gss_mech_to_oid_call("kerberosv5", &mech_oid)) 514 return (NULL); 515 } 516 if (secflavour == RPCSEC_GSS_KRB5) 517 svc = rpc_gss_svc_none; 518 else if (secflavour == RPCSEC_GSS_KRB5I) 519 svc = rpc_gss_svc_integrity; 520 else 521 svc = rpc_gss_svc_privacy; 522 523 if (clnt_principal == NULL) 524 auth = rpc_gss_secfind_call(nrp->nr_client, cred, 525 srv_principal, mech_oid, svc); 526 else { 527 auth = rpc_gss_seccreate_call(nrp->nr_client, cred, 528 clnt_principal, srv_principal, "kerberosv5", 529 svc, NULL, NULL, NULL); 530 return (auth); 531 } 532 if (auth != NULL) 533 return (auth); 534 /* fallthrough */ 535 case AUTH_SYS: 536 default: 537 return (authunix_create(cred)); 538 } 539 } 540 541 /* 542 * Callback from the RPC code to generate up/down notifications. 543 */ 544 545 struct nfs_feedback_arg { 546 struct nfsmount *nf_mount; 547 int nf_lastmsg; /* last tprintf */ 548 int nf_tprintfmsg; 549 struct thread *nf_td; 550 }; 551 552 static void 553 nfs_feedback(int type, int proc, void *arg) 554 { 555 struct nfs_feedback_arg *nf = (struct nfs_feedback_arg *) arg; 556 struct nfsmount *nmp = nf->nf_mount; 557 time_t now; 558 559 switch (type) { 560 case FEEDBACK_REXMIT2: 561 case FEEDBACK_RECONNECT: 562 now = NFSD_MONOSEC; 563 if (nf->nf_lastmsg + nmp->nm_tprintf_delay < now) { 564 nfs_down(nmp, nf->nf_td, 565 "not responding", 0, NFSSTA_TIMEO); 566 nf->nf_tprintfmsg = TRUE; 567 nf->nf_lastmsg = now; 568 } 569 break; 570 571 case FEEDBACK_OK: 572 nfs_up(nf->nf_mount, nf->nf_td, 573 "is alive again", NFSSTA_TIMEO, nf->nf_tprintfmsg); 574 break; 575 } 576 } 577 578 /* 579 * newnfs_request - goes something like this 580 * - does the rpc by calling the krpc layer 581 * - break down rpc header and return with nfs reply 582 * nb: always frees up nd_mreq mbuf list 583 */ 584 int 585 newnfs_request(struct nfsrv_descript *nd, struct nfsmount *nmp, 586 struct nfsclient *clp, struct nfssockreq *nrp, vnode_t vp, 587 struct thread *td, struct ucred *cred, u_int32_t prog, u_int32_t vers, 588 u_char *retsum, int toplevel, u_int64_t *xidp, struct nfsclsession *dssep) 589 { 590 uint32_t retseq, retval, slotseq, *tl; 591 int i = 0, j = 0, opcnt, set_sigset = 0, slot; 592 int error = 0, usegssname = 0, secflavour = AUTH_SYS; 593 int freeslot, maxslot, reterr, slotpos, timeo; 594 u_int16_t procnum; 595 u_int nextconn; 596 struct nfs_feedback_arg nf; 597 struct timeval timo; 598 AUTH *auth; 599 struct rpc_callextra ext; 600 enum clnt_stat stat; 601 struct nfsreq *rep = NULL; 602 char *srv_principal = NULL, *clnt_principal = NULL; 603 sigset_t oldset; 604 struct ucred *authcred; 605 struct nfsclsession *sep; 606 uint8_t sessionid[NFSX_V4SESSIONID]; 607 bool nextconn_set; 608 struct timespec trylater_delay, ts, waituntil; 609 610 /* Initially 1msec. */ 611 trylater_delay.tv_sec = 0; 612 trylater_delay.tv_nsec = 1000000; 613 sep = dssep; 614 if (xidp != NULL) 615 *xidp = 0; 616 /* Reject requests while attempting a forced unmount. */ 617 if (nmp != NULL && NFSCL_FORCEDISM(nmp->nm_mountp)) { 618 m_freem(nd->nd_mreq); 619 return (ESTALE); 620 } 621 622 /* 623 * Set authcred, which is used to acquire RPC credentials to 624 * the cred argument, by default. The crhold() should not be 625 * necessary, but will ensure that some future code change 626 * doesn't result in the credential being free'd prematurely. 627 */ 628 authcred = crhold(cred); 629 630 /* For client side interruptible mounts, mask off the signals. */ 631 if (nmp != NULL && td != NULL && NFSHASINT(nmp)) { 632 newnfs_set_sigmask(td, &oldset); 633 set_sigset = 1; 634 } 635 636 /* 637 * If not already connected call newnfs_connect now. 638 */ 639 if (nrp->nr_client == NULL) 640 newnfs_connect(nmp, nrp, cred, td, 0, false, &nrp->nr_client); 641 642 /* 643 * If the "nconnect" mount option was specified and this RPC is 644 * one that can have a large RPC message and is being done through 645 * the NFS/MDS server, use an additional connection. (When the RPC is 646 * being done through the server/MDS, nrp == &nmp->nm_sockreq.) 647 * The "nconnect" mount option normally has minimal effect when the 648 * "pnfs" mount option is specified, since only Readdir RPCs are 649 * normally done through the NFS/MDS server. 650 */ 651 nextconn_set = false; 652 if (nmp != NULL && nmp->nm_aconnect > 0 && nrp == &nmp->nm_sockreq && 653 (nd->nd_procnum == NFSPROC_READ || 654 nd->nd_procnum == NFSPROC_READDIR || 655 nd->nd_procnum == NFSPROC_READDIRPLUS || 656 nd->nd_procnum == NFSPROC_WRITE)) { 657 nextconn = atomic_fetchadd_int(&nmp->nm_nextaconn, 1); 658 nextconn %= nmp->nm_aconnect; 659 nextconn_set = true; 660 if (nmp->nm_aconn[nextconn] == NULL) 661 newnfs_connect(nmp, nrp, cred, td, 0, false, 662 &nmp->nm_aconn[nextconn]); 663 } 664 665 /* 666 * For a client side mount, nmp is != NULL and clp == NULL. For 667 * server calls (callbacks or upcalls), nmp == NULL. 668 */ 669 if (clp != NULL) { 670 NFSLOCKSTATE(); 671 if ((clp->lc_flags & LCL_GSS) && nfsrv_gsscallbackson) { 672 secflavour = RPCSEC_GSS_KRB5; 673 if (nd->nd_procnum != NFSPROC_NULL) { 674 if (clp->lc_flags & LCL_GSSINTEGRITY) 675 secflavour = RPCSEC_GSS_KRB5I; 676 else if (clp->lc_flags & LCL_GSSPRIVACY) 677 secflavour = RPCSEC_GSS_KRB5P; 678 } 679 } 680 NFSUNLOCKSTATE(); 681 } else if (nmp != NULL && NFSHASKERB(nmp) && 682 nd->nd_procnum != NFSPROC_NULL) { 683 if (NFSHASALLGSSNAME(nmp) && nmp->nm_krbnamelen > 0) 684 nd->nd_flag |= ND_USEGSSNAME; 685 if ((nd->nd_flag & ND_USEGSSNAME) != 0) { 686 /* 687 * If there is a client side host based credential, 688 * use that, otherwise use the system uid, if set. 689 * The system uid is in the nmp->nm_sockreq.nr_cred 690 * credentials. 691 */ 692 if (nmp->nm_krbnamelen > 0) { 693 usegssname = 1; 694 clnt_principal = nmp->nm_krbname; 695 } else if (nmp->nm_uid != (uid_t)-1) { 696 KASSERT(nmp->nm_sockreq.nr_cred != NULL, 697 ("newnfs_request: NULL nr_cred")); 698 crfree(authcred); 699 authcred = crhold(nmp->nm_sockreq.nr_cred); 700 } 701 } else if (nmp->nm_krbnamelen == 0 && 702 nmp->nm_uid != (uid_t)-1 && cred->cr_uid == (uid_t)0) { 703 /* 704 * If there is no host based principal name and 705 * the system uid is set and this is root, use the 706 * system uid, since root won't have user 707 * credentials in a credentials cache file. 708 * The system uid is in the nmp->nm_sockreq.nr_cred 709 * credentials. 710 */ 711 KASSERT(nmp->nm_sockreq.nr_cred != NULL, 712 ("newnfs_request: NULL nr_cred")); 713 crfree(authcred); 714 authcred = crhold(nmp->nm_sockreq.nr_cred); 715 } 716 if (NFSHASINTEGRITY(nmp)) 717 secflavour = RPCSEC_GSS_KRB5I; 718 else if (NFSHASPRIVACY(nmp)) 719 secflavour = RPCSEC_GSS_KRB5P; 720 else 721 secflavour = RPCSEC_GSS_KRB5; 722 srv_principal = NFSMNT_SRVKRBNAME(nmp); 723 } else if (nmp != NULL && !NFSHASKERB(nmp) && 724 nd->nd_procnum != NFSPROC_NULL && 725 (nd->nd_flag & ND_USEGSSNAME) != 0) { 726 /* 727 * Use the uid that did the mount when the RPC is doing 728 * NFSv4 system operations, as indicated by the 729 * ND_USEGSSNAME flag, for the AUTH_SYS case. 730 * The credentials in nm_sockreq.nr_cred were used for the 731 * mount. 732 */ 733 KASSERT(nmp->nm_sockreq.nr_cred != NULL, 734 ("newnfs_request: NULL nr_cred")); 735 crfree(authcred); 736 authcred = crhold(nmp->nm_sockreq.nr_cred); 737 } 738 739 if (nmp != NULL) { 740 bzero(&nf, sizeof(struct nfs_feedback_arg)); 741 nf.nf_mount = nmp; 742 nf.nf_td = td; 743 nf.nf_lastmsg = NFSD_MONOSEC - 744 ((nmp->nm_tprintf_delay)-(nmp->nm_tprintf_initial_delay)); 745 } 746 747 if (nd->nd_procnum == NFSPROC_NULL) 748 auth = authnone_create(); 749 else if (usegssname) { 750 /* 751 * For this case, the authenticator is held in the 752 * nfssockreq structure, so don't release the reference count 753 * held on it. --> Don't AUTH_DESTROY() it in this function. 754 */ 755 if (nrp->nr_auth == NULL) 756 nrp->nr_auth = nfs_getauth(nrp, secflavour, 757 clnt_principal, srv_principal, NULL, authcred); 758 else 759 rpc_gss_refresh_auth_call(nrp->nr_auth); 760 auth = nrp->nr_auth; 761 } else 762 auth = nfs_getauth(nrp, secflavour, NULL, 763 srv_principal, NULL, authcred); 764 crfree(authcred); 765 if (auth == NULL) { 766 m_freem(nd->nd_mreq); 767 if (set_sigset) 768 newnfs_restore_sigmask(td, &oldset); 769 return (EACCES); 770 } 771 bzero(&ext, sizeof(ext)); 772 ext.rc_auth = auth; 773 if (nmp != NULL) { 774 ext.rc_feedback = nfs_feedback; 775 ext.rc_feedback_arg = &nf; 776 } 777 778 procnum = nd->nd_procnum; 779 if ((nd->nd_flag & ND_NFSV4) && 780 nd->nd_procnum != NFSPROC_NULL && 781 nd->nd_procnum != NFSV4PROC_CBCOMPOUND) 782 procnum = NFSV4PROC_COMPOUND; 783 784 if (nmp != NULL) { 785 NFSINCRGLOBAL(nfsstatsv1.rpcrequests); 786 787 /* Map the procnum to the old NFSv2 one, as required. */ 788 if ((nd->nd_flag & ND_NFSV2) != 0) { 789 if (nd->nd_procnum < NFS_V3NPROCS) 790 procnum = nfsv2_procid[nd->nd_procnum]; 791 else 792 procnum = NFSV2PROC_NOOP; 793 } 794 795 /* 796 * Now only used for the R_DONTRECOVER case, but until that is 797 * supported within the krpc code, I need to keep a queue of 798 * outstanding RPCs for nfsv4 client requests. 799 */ 800 if ((nd->nd_flag & ND_NFSV4) && procnum == NFSV4PROC_COMPOUND) 801 rep = malloc(sizeof(struct nfsreq), 802 M_NFSDREQ, M_WAITOK); 803 #ifdef KDTRACE_HOOKS 804 if (dtrace_nfscl_nfs234_start_probe != NULL) { 805 uint32_t probe_id; 806 int probe_procnum; 807 808 if (nd->nd_flag & ND_NFSV4) { 809 probe_id = 810 nfscl_nfs4_start_probes[nd->nd_procnum]; 811 probe_procnum = nd->nd_procnum; 812 } else if (nd->nd_flag & ND_NFSV3) { 813 probe_id = nfscl_nfs3_start_probes[procnum]; 814 probe_procnum = procnum; 815 } else { 816 probe_id = 817 nfscl_nfs2_start_probes[nd->nd_procnum]; 818 probe_procnum = procnum; 819 } 820 if (probe_id != 0) 821 (dtrace_nfscl_nfs234_start_probe) 822 (probe_id, vp, nd->nd_mreq, cred, 823 probe_procnum); 824 } 825 #endif 826 } 827 freeslot = -1; /* Set to slot that needs to be free'd */ 828 tryagain: 829 slot = -1; /* Slot that needs a sequence# increment. */ 830 /* 831 * This timeout specifies when a new socket should be created, 832 * along with new xid values. For UDP, this should be done 833 * infrequently, since retransmits of RPC requests should normally 834 * use the same xid. 835 */ 836 if (nmp == NULL) { 837 if (clp == NULL) { 838 timo.tv_sec = NFSV4_UPCALLTIMEO; 839 timo.tv_usec = 0; 840 } else { 841 timo.tv_sec = NFSV4_CALLBACKTIMEO / 1000; 842 timo.tv_usec = NFSV4_CALLBACKTIMEO * 1000; 843 } 844 } else { 845 if (nrp->nr_sotype != SOCK_DGRAM) { 846 timo.tv_usec = 0; 847 if ((nmp->nm_flag & NFSMNT_NFSV4)) 848 timo.tv_sec = INT_MAX; 849 else 850 timo.tv_sec = NFS_TCPTIMEO; 851 } else { 852 if (NFSHASSOFT(nmp)) { 853 /* 854 * CLSET_RETRIES is set to 2, so this should be 855 * half of the total timeout required. 856 */ 857 timeo = nmp->nm_retry * nmp->nm_timeo / 2; 858 if (timeo < 1) 859 timeo = 1; 860 timo.tv_sec = timeo / NFS_HZ; 861 timo.tv_usec = (timeo % NFS_HZ) * 1000000 / 862 NFS_HZ; 863 } else { 864 /* For UDP hard mounts, use a large value. */ 865 timo.tv_sec = NFS_MAXTIMEO / NFS_HZ; 866 timo.tv_usec = 0; 867 } 868 } 869 870 if (rep != NULL) { 871 rep->r_flags = 0; 872 rep->r_nmp = nmp; 873 /* 874 * Chain request into list of outstanding requests. 875 */ 876 NFSLOCKREQ(); 877 TAILQ_INSERT_TAIL(&nfsd_reqq, rep, r_chain); 878 NFSUNLOCKREQ(); 879 } 880 } 881 882 nd->nd_mrep = NULL; 883 if (clp != NULL && sep != NULL) 884 stat = clnt_bck_call(nrp->nr_client, &ext, procnum, 885 nd->nd_mreq, &nd->nd_mrep, timo, sep->nfsess_xprt); 886 else if (nextconn_set) 887 /* 888 * When there are multiple TCP connections, send the 889 * RPCs with large messages on the alternate TCP 890 * connection(s) in a round robin fashion. 891 * The small RPC messages are sent on the default 892 * TCP connection because they do not require much 893 * network bandwidth and separating them from the 894 * large RPC messages avoids them getting "log jammed" 895 * behind several large RPC messages. 896 */ 897 stat = CLNT_CALL_MBUF(nmp->nm_aconn[nextconn], 898 &ext, procnum, nd->nd_mreq, &nd->nd_mrep, timo); 899 else 900 stat = CLNT_CALL_MBUF(nrp->nr_client, &ext, procnum, 901 nd->nd_mreq, &nd->nd_mrep, timo); 902 NFSCL_DEBUG(2, "clnt call=%d\n", stat); 903 904 if (rep != NULL) { 905 /* 906 * RPC done, unlink the request. 907 */ 908 NFSLOCKREQ(); 909 TAILQ_REMOVE(&nfsd_reqq, rep, r_chain); 910 NFSUNLOCKREQ(); 911 } 912 913 /* 914 * If there was a successful reply and a tprintf msg. 915 * tprintf a response. 916 */ 917 if (stat == RPC_SUCCESS) { 918 error = 0; 919 } else if (stat == RPC_TIMEDOUT) { 920 NFSINCRGLOBAL(nfsstatsv1.rpctimeouts); 921 error = ETIMEDOUT; 922 } else if (stat == RPC_VERSMISMATCH) { 923 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid); 924 error = EOPNOTSUPP; 925 } else if (stat == RPC_PROGVERSMISMATCH) { 926 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid); 927 error = EPROTONOSUPPORT; 928 } else if (stat == RPC_CANTSEND || stat == RPC_CANTRECV || 929 stat == RPC_SYSTEMERROR || stat == RPC_INTR) { 930 /* Check for a session slot that needs to be free'd. */ 931 if ((nd->nd_flag & (ND_NFSV41 | ND_HASSLOTID)) == 932 (ND_NFSV41 | ND_HASSLOTID) && nmp != NULL && 933 nd->nd_procnum != NFSPROC_NULL) { 934 /* 935 * This should only occur when either the MDS or 936 * a client has an RPC against a DS fail. 937 * This happens because these cases use "soft" 938 * connections that can time out and fail. 939 * The slot used for this RPC is now in a 940 * non-deterministic state, but if the slot isn't 941 * free'd, threads can get stuck waiting for a slot. 942 */ 943 if (sep == NULL) 944 sep = nfsmnt_mdssession(nmp); 945 /* 946 * Bump the sequence# out of range, so that reuse of 947 * this slot will result in an NFSERR_SEQMISORDERED 948 * error and not a bogus cached RPC reply. 949 */ 950 mtx_lock(&sep->nfsess_mtx); 951 sep->nfsess_slotseq[nd->nd_slotid] += 10; 952 sep->nfsess_badslots |= (0x1ULL << nd->nd_slotid); 953 mtx_unlock(&sep->nfsess_mtx); 954 /* And free the slot. */ 955 nfsv4_freeslot(sep, nd->nd_slotid, false); 956 } 957 if (stat == RPC_INTR) 958 error = EINTR; 959 else { 960 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid); 961 error = ENXIO; 962 } 963 } else { 964 NFSINCRGLOBAL(nfsstatsv1.rpcinvalid); 965 error = EACCES; 966 } 967 if (error) { 968 m_freem(nd->nd_mreq); 969 if (usegssname == 0) 970 AUTH_DESTROY(auth); 971 if (rep != NULL) 972 free(rep, M_NFSDREQ); 973 if (set_sigset) 974 newnfs_restore_sigmask(td, &oldset); 975 return (error); 976 } 977 978 KASSERT(nd->nd_mrep != NULL, ("mrep shouldn't be NULL if no error\n")); 979 980 /* 981 * Search for any mbufs that are not a multiple of 4 bytes long 982 * or with m_data not longword aligned. 983 * These could cause pointer alignment problems, so copy them to 984 * well aligned mbufs. 985 */ 986 newnfs_realign(&nd->nd_mrep, M_WAITOK); 987 nd->nd_md = nd->nd_mrep; 988 nd->nd_dpos = mtod(nd->nd_md, caddr_t); 989 nd->nd_repstat = 0; 990 if (nd->nd_procnum != NFSPROC_NULL && 991 nd->nd_procnum != NFSV4PROC_CBNULL) { 992 /* If sep == NULL, set it to the default in nmp. */ 993 if (sep == NULL && nmp != NULL) 994 sep = nfsmnt_mdssession(nmp); 995 /* 996 * and now the actual NFS xdr. 997 */ 998 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 999 nd->nd_repstat = fxdr_unsigned(u_int32_t, *tl); 1000 if (nd->nd_repstat >= 10000) 1001 NFSCL_DEBUG(1, "proc=%d reps=%d\n", (int)nd->nd_procnum, 1002 (int)nd->nd_repstat); 1003 1004 /* 1005 * Get rid of the tag, return count and SEQUENCE result for 1006 * NFSv4. 1007 */ 1008 if ((nd->nd_flag & ND_NFSV4) != 0 && nd->nd_repstat != 1009 NFSERR_MINORVERMISMATCH) { 1010 NFSM_DISSECT(tl, u_int32_t *, NFSX_UNSIGNED); 1011 i = fxdr_unsigned(int, *tl); 1012 error = nfsm_advance(nd, NFSM_RNDUP(i), -1); 1013 if (error) 1014 goto nfsmout; 1015 NFSM_DISSECT(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1016 opcnt = fxdr_unsigned(int, *tl++); 1017 i = fxdr_unsigned(int, *tl++); 1018 j = fxdr_unsigned(int, *tl); 1019 if (j >= 10000) 1020 NFSCL_DEBUG(1, "fop=%d fst=%d\n", i, j); 1021 /* 1022 * If the first op is Sequence, free up the slot. 1023 */ 1024 if ((nmp != NULL && i == NFSV4OP_SEQUENCE && j != 0) || 1025 (clp != NULL && i == NFSV4OP_CBSEQUENCE && j != 0)) { 1026 NFSCL_DEBUG(1, "failed seq=%d\n", j); 1027 if (sep != NULL && i == NFSV4OP_SEQUENCE && 1028 j == NFSERR_SEQMISORDERED) { 1029 mtx_lock(&sep->nfsess_mtx); 1030 sep->nfsess_badslots |= 1031 (0x1ULL << nd->nd_slotid); 1032 mtx_unlock(&sep->nfsess_mtx); 1033 } 1034 } 1035 if (((nmp != NULL && i == NFSV4OP_SEQUENCE && j == 0) || 1036 (clp != NULL && i == NFSV4OP_CBSEQUENCE && 1037 j == 0)) && sep != NULL) { 1038 if (i == NFSV4OP_SEQUENCE) 1039 NFSM_DISSECT(tl, uint32_t *, 1040 NFSX_V4SESSIONID + 1041 5 * NFSX_UNSIGNED); 1042 else 1043 NFSM_DISSECT(tl, uint32_t *, 1044 NFSX_V4SESSIONID + 1045 4 * NFSX_UNSIGNED); 1046 mtx_lock(&sep->nfsess_mtx); 1047 if (bcmp(tl, sep->nfsess_sessionid, 1048 NFSX_V4SESSIONID) == 0) { 1049 tl += NFSX_V4SESSIONID / NFSX_UNSIGNED; 1050 retseq = fxdr_unsigned(uint32_t, *tl++); 1051 slot = fxdr_unsigned(int, *tl++); 1052 if ((nd->nd_flag & ND_HASSLOTID) != 0) { 1053 if (slot >= NFSV4_SLOTS || 1054 (i == NFSV4OP_CBSEQUENCE && 1055 slot >= NFSV4_CBSLOTS)) { 1056 printf("newnfs_request:" 1057 " Bogus slot\n"); 1058 slot = nd->nd_slotid; 1059 } else if (slot != 1060 nd->nd_slotid) { 1061 printf("newnfs_request:" 1062 " Wrong session " 1063 "srvslot=%d " 1064 "slot=%d\n", slot, 1065 nd->nd_slotid); 1066 if (i == NFSV4OP_SEQUENCE) { 1067 /* 1068 * Mark both slots as 1069 * bad, because we do 1070 * not know if the 1071 * server has advanced 1072 * the sequence# for 1073 * either of them. 1074 */ 1075 sep->nfsess_badslots |= 1076 (0x1ULL << slot); 1077 sep->nfsess_badslots |= 1078 (0x1ULL << 1079 nd->nd_slotid); 1080 } 1081 slot = nd->nd_slotid; 1082 } 1083 freeslot = slot; 1084 } else if (slot != 0) { 1085 printf("newnfs_request: Bad " 1086 "session slot=%d\n", slot); 1087 slot = 0; 1088 } 1089 if (retseq != sep->nfsess_slotseq[slot]) 1090 printf("retseq diff 0x%x\n", 1091 retseq); 1092 retval = fxdr_unsigned(uint32_t, *++tl); 1093 if ((retval + 1) < sep->nfsess_foreslots 1094 ) 1095 sep->nfsess_foreslots = (retval 1096 + 1); 1097 else if ((retval + 1) > 1098 sep->nfsess_foreslots) 1099 sep->nfsess_foreslots = (retval 1100 < 64) ? (retval + 1) : 64; 1101 } 1102 mtx_unlock(&sep->nfsess_mtx); 1103 1104 /* Grab the op and status for the next one. */ 1105 if (opcnt > 1) { 1106 NFSM_DISSECT(tl, uint32_t *, 1107 2 * NFSX_UNSIGNED); 1108 i = fxdr_unsigned(int, *tl++); 1109 j = fxdr_unsigned(int, *tl); 1110 } 1111 } 1112 } 1113 if (nd->nd_repstat != 0) { 1114 if (nd->nd_repstat == NFSERR_BADSESSION && 1115 nmp != NULL && dssep == NULL && 1116 (nd->nd_flag & ND_NFSV41) != 0) { 1117 /* 1118 * If this is a client side MDS RPC, mark 1119 * the MDS session defunct and initiate 1120 * recovery, as required. 1121 * The nfsess_defunct field is protected by 1122 * the NFSLOCKMNT()/nm_mtx lock and not the 1123 * nfsess_mtx lock to simplify its handling, 1124 * for the MDS session. This lock is also 1125 * sufficient for nfsess_sessionid, since it 1126 * never changes in the structure. 1127 */ 1128 NFSCL_DEBUG(1, "Got badsession\n"); 1129 NFSLOCKCLSTATE(); 1130 NFSLOCKMNT(nmp); 1131 sep = NFSMNT_MDSSESSION(nmp); 1132 if (bcmp(sep->nfsess_sessionid, nd->nd_sequence, 1133 NFSX_V4SESSIONID) == 0) { 1134 printf("Initiate recovery. If server " 1135 "has not rebooted, " 1136 "check NFS clients for unique " 1137 "/etc/hostid's\n"); 1138 /* Initiate recovery. */ 1139 sep->nfsess_defunct = 1; 1140 NFSCL_DEBUG(1, "Marked defunct\n"); 1141 if (nmp->nm_clp != NULL) { 1142 nmp->nm_clp->nfsc_flags |= 1143 NFSCLFLAGS_RECOVER; 1144 wakeup(nmp->nm_clp); 1145 } 1146 } 1147 NFSUNLOCKCLSTATE(); 1148 /* 1149 * Sleep for up to 1sec waiting for a new 1150 * session. 1151 */ 1152 mtx_sleep(&nmp->nm_sess, &nmp->nm_mtx, PZERO, 1153 "nfsbadsess", hz); 1154 /* 1155 * Get the session again, in case a new one 1156 * has been created during the sleep. 1157 */ 1158 sep = NFSMNT_MDSSESSION(nmp); 1159 NFSUNLOCKMNT(nmp); 1160 if ((nd->nd_flag & ND_LOOPBADSESS) != 0) { 1161 reterr = nfsv4_sequencelookup(nmp, sep, 1162 &slotpos, &maxslot, &slotseq, 1163 sessionid, true); 1164 if (reterr == 0) { 1165 /* Fill in new session info. */ 1166 NFSCL_DEBUG(1, 1167 "Filling in new sequence\n"); 1168 tl = nd->nd_sequence; 1169 bcopy(sessionid, tl, 1170 NFSX_V4SESSIONID); 1171 tl += NFSX_V4SESSIONID / 1172 NFSX_UNSIGNED; 1173 *tl++ = txdr_unsigned(slotseq); 1174 *tl++ = txdr_unsigned(slotpos); 1175 *tl = txdr_unsigned(maxslot); 1176 nd->nd_slotid = slotpos; 1177 nd->nd_flag |= ND_HASSLOTID; 1178 } 1179 if (reterr == NFSERR_BADSESSION || 1180 reterr == 0) { 1181 NFSCL_DEBUG(1, 1182 "Badsession looping\n"); 1183 m_freem(nd->nd_mrep); 1184 nd->nd_mrep = NULL; 1185 goto tryagain; 1186 } 1187 nd->nd_repstat = reterr; 1188 NFSCL_DEBUG(1, "Got err=%d\n", reterr); 1189 } 1190 } 1191 /* 1192 * When clp != NULL, it is a callback and all 1193 * callback operations can be retried for NFSERR_DELAY. 1194 */ 1195 if (((nd->nd_repstat == NFSERR_DELAY || 1196 nd->nd_repstat == NFSERR_GRACE) && 1197 (nd->nd_flag & ND_NFSV4) && (clp != NULL || 1198 (nd->nd_procnum != NFSPROC_DELEGRETURN && 1199 nd->nd_procnum != NFSPROC_SETATTR && 1200 nd->nd_procnum != NFSPROC_READ && 1201 nd->nd_procnum != NFSPROC_READDS && 1202 nd->nd_procnum != NFSPROC_WRITE && 1203 nd->nd_procnum != NFSPROC_WRITEDS && 1204 nd->nd_procnum != NFSPROC_OPEN && 1205 nd->nd_procnum != NFSPROC_OPENLAYGET && 1206 nd->nd_procnum != NFSPROC_CREATE && 1207 nd->nd_procnum != NFSPROC_CREATELAYGET && 1208 nd->nd_procnum != NFSPROC_OPENCONFIRM && 1209 nd->nd_procnum != NFSPROC_OPENDOWNGRADE && 1210 nd->nd_procnum != NFSPROC_CLOSE && 1211 nd->nd_procnum != NFSPROC_LOCK && 1212 nd->nd_procnum != NFSPROC_LOCKU))) || 1213 (nd->nd_repstat == NFSERR_DELAY && 1214 (nd->nd_flag & ND_NFSV4) == 0) || 1215 nd->nd_repstat == NFSERR_RESOURCE) { 1216 /* Clip at NFS_TRYLATERDEL. */ 1217 if (timespeccmp(&trylater_delay, 1218 &nfs_trylater_max, >)) 1219 trylater_delay = nfs_trylater_max; 1220 getnanouptime(&waituntil); 1221 timespecadd(&waituntil, &trylater_delay, 1222 &waituntil); 1223 do { 1224 nfs_catnap(PZERO, 0, "nfstry"); 1225 getnanouptime(&ts); 1226 } while (timespeccmp(&ts, &waituntil, <)); 1227 timespecadd(&trylater_delay, &trylater_delay, 1228 &trylater_delay); /* Double each time. */ 1229 if (slot != -1) { 1230 mtx_lock(&sep->nfsess_mtx); 1231 sep->nfsess_slotseq[slot]++; 1232 *nd->nd_slotseq = txdr_unsigned( 1233 sep->nfsess_slotseq[slot]); 1234 mtx_unlock(&sep->nfsess_mtx); 1235 } 1236 m_freem(nd->nd_mrep); 1237 nd->nd_mrep = NULL; 1238 goto tryagain; 1239 } 1240 1241 /* 1242 * If the File Handle was stale, invalidate the 1243 * lookup cache, just in case. 1244 * (vp != NULL implies a client side call) 1245 */ 1246 if (nd->nd_repstat == ESTALE && vp != NULL) { 1247 cache_purge(vp); 1248 if (ncl_call_invalcaches != NULL) 1249 (*ncl_call_invalcaches)(vp); 1250 } 1251 } 1252 if ((nd->nd_flag & ND_NFSV4) != 0) { 1253 /* Free the slot, as required. */ 1254 if (freeslot != -1) 1255 nfsv4_freeslot(sep, freeslot, false); 1256 /* 1257 * If this op is Putfh, throw its results away. 1258 */ 1259 if (j >= 10000) 1260 NFSCL_DEBUG(1, "nop=%d nst=%d\n", i, j); 1261 if (nmp != NULL && i == NFSV4OP_PUTFH && j == 0) { 1262 NFSM_DISSECT(tl,u_int32_t *,2 * NFSX_UNSIGNED); 1263 i = fxdr_unsigned(int, *tl++); 1264 j = fxdr_unsigned(int, *tl); 1265 if (j >= 10000) 1266 NFSCL_DEBUG(1, "n2op=%d n2st=%d\n", i, 1267 j); 1268 /* 1269 * All Compounds that do an Op that must 1270 * be in sequence consist of NFSV4OP_PUTFH 1271 * followed by one of these. As such, we 1272 * can determine if the seqid# should be 1273 * incremented, here. 1274 */ 1275 if ((i == NFSV4OP_OPEN || 1276 i == NFSV4OP_OPENCONFIRM || 1277 i == NFSV4OP_OPENDOWNGRADE || 1278 i == NFSV4OP_CLOSE || 1279 i == NFSV4OP_LOCK || 1280 i == NFSV4OP_LOCKU) && 1281 (j == 0 || 1282 (j != NFSERR_STALECLIENTID && 1283 j != NFSERR_STALESTATEID && 1284 j != NFSERR_BADSTATEID && 1285 j != NFSERR_BADSEQID && 1286 j != NFSERR_BADXDR && 1287 j != NFSERR_RESOURCE && 1288 j != NFSERR_NOFILEHANDLE))) 1289 nd->nd_flag |= ND_INCRSEQID; 1290 } 1291 /* 1292 * If this op's status is non-zero, mark 1293 * that there is no more data to process. 1294 * The exception is Setattr, which always has xdr 1295 * when it has failed. 1296 */ 1297 if (j != 0 && i != NFSV4OP_SETATTR) 1298 nd->nd_flag |= ND_NOMOREDATA; 1299 1300 /* 1301 * If R_DONTRECOVER is set, replace the stale error 1302 * reply, so that recovery isn't initiated. 1303 */ 1304 if ((nd->nd_repstat == NFSERR_STALECLIENTID || 1305 nd->nd_repstat == NFSERR_BADSESSION || 1306 nd->nd_repstat == NFSERR_STALESTATEID) && 1307 rep != NULL && (rep->r_flags & R_DONTRECOVER)) 1308 nd->nd_repstat = NFSERR_STALEDONTRECOVER; 1309 } 1310 } 1311 1312 #ifdef KDTRACE_HOOKS 1313 if (nmp != NULL && dtrace_nfscl_nfs234_done_probe != NULL) { 1314 uint32_t probe_id; 1315 int probe_procnum; 1316 1317 if (nd->nd_flag & ND_NFSV4) { 1318 probe_id = nfscl_nfs4_done_probes[nd->nd_procnum]; 1319 probe_procnum = nd->nd_procnum; 1320 } else if (nd->nd_flag & ND_NFSV3) { 1321 probe_id = nfscl_nfs3_done_probes[procnum]; 1322 probe_procnum = procnum; 1323 } else { 1324 probe_id = nfscl_nfs2_done_probes[nd->nd_procnum]; 1325 probe_procnum = procnum; 1326 } 1327 if (probe_id != 0) 1328 (dtrace_nfscl_nfs234_done_probe)(probe_id, vp, 1329 nd->nd_mreq, cred, probe_procnum, 0); 1330 } 1331 #endif 1332 1333 m_freem(nd->nd_mreq); 1334 if (usegssname == 0) 1335 AUTH_DESTROY(auth); 1336 if (rep != NULL) 1337 free(rep, M_NFSDREQ); 1338 if (set_sigset) 1339 newnfs_restore_sigmask(td, &oldset); 1340 return (0); 1341 nfsmout: 1342 m_freem(nd->nd_mrep); 1343 m_freem(nd->nd_mreq); 1344 if (usegssname == 0) 1345 AUTH_DESTROY(auth); 1346 if (rep != NULL) 1347 free(rep, M_NFSDREQ); 1348 if (set_sigset) 1349 newnfs_restore_sigmask(td, &oldset); 1350 return (error); 1351 } 1352 1353 /* 1354 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1355 * wait for all requests to complete. This is used by forced unmounts 1356 * to terminate any outstanding RPCs. 1357 */ 1358 int 1359 newnfs_nmcancelreqs(struct nfsmount *nmp) 1360 { 1361 struct nfsclds *dsp; 1362 struct __rpc_client *cl; 1363 int i; 1364 1365 if (nmp->nm_sockreq.nr_client != NULL) 1366 CLNT_CLOSE(nmp->nm_sockreq.nr_client); 1367 for (i = 0; i < nmp->nm_aconnect; i++) 1368 if (nmp->nm_aconn[i] != NULL) 1369 CLNT_CLOSE(nmp->nm_aconn[i]); 1370 lookformore: 1371 NFSLOCKMNT(nmp); 1372 TAILQ_FOREACH(dsp, &nmp->nm_sess, nfsclds_list) { 1373 NFSLOCKDS(dsp); 1374 if (dsp != TAILQ_FIRST(&nmp->nm_sess) && 1375 (dsp->nfsclds_flags & NFSCLDS_CLOSED) == 0 && 1376 dsp->nfsclds_sockp != NULL && 1377 dsp->nfsclds_sockp->nr_client != NULL) { 1378 dsp->nfsclds_flags |= NFSCLDS_CLOSED; 1379 cl = dsp->nfsclds_sockp->nr_client; 1380 NFSUNLOCKDS(dsp); 1381 NFSUNLOCKMNT(nmp); 1382 CLNT_CLOSE(cl); 1383 goto lookformore; 1384 } 1385 NFSUNLOCKDS(dsp); 1386 } 1387 NFSUNLOCKMNT(nmp); 1388 return (0); 1389 } 1390 1391 /* 1392 * Any signal that can interrupt an NFS operation in an intr mount 1393 * should be added to this set. SIGSTOP and SIGKILL cannot be masked. 1394 */ 1395 int newnfs_sig_set[] = { 1396 SIGINT, 1397 SIGTERM, 1398 SIGHUP, 1399 SIGKILL, 1400 SIGQUIT 1401 }; 1402 1403 /* 1404 * Check to see if one of the signals in our subset is pending on 1405 * the process (in an intr mount). 1406 */ 1407 static int 1408 nfs_sig_pending(sigset_t set) 1409 { 1410 int i; 1411 1412 for (i = 0 ; i < nitems(newnfs_sig_set); i++) 1413 if (SIGISMEMBER(set, newnfs_sig_set[i])) 1414 return (1); 1415 return (0); 1416 } 1417 1418 /* 1419 * The set/restore sigmask functions are used to (temporarily) overwrite 1420 * the thread td_sigmask during an RPC call (for example). These are also 1421 * used in other places in the NFS client that might tsleep(). 1422 */ 1423 void 1424 newnfs_set_sigmask(struct thread *td, sigset_t *oldset) 1425 { 1426 sigset_t newset; 1427 int i; 1428 struct proc *p; 1429 1430 SIGFILLSET(newset); 1431 if (td == NULL) 1432 td = curthread; /* XXX */ 1433 p = td->td_proc; 1434 /* Remove the NFS set of signals from newset */ 1435 PROC_LOCK(p); 1436 mtx_lock(&p->p_sigacts->ps_mtx); 1437 for (i = 0 ; i < nitems(newnfs_sig_set); i++) { 1438 /* 1439 * But make sure we leave the ones already masked 1440 * by the process, ie. remove the signal from the 1441 * temporary signalmask only if it wasn't already 1442 * in p_sigmask. 1443 */ 1444 if (!SIGISMEMBER(td->td_sigmask, newnfs_sig_set[i]) && 1445 !SIGISMEMBER(p->p_sigacts->ps_sigignore, newnfs_sig_set[i])) 1446 SIGDELSET(newset, newnfs_sig_set[i]); 1447 } 1448 mtx_unlock(&p->p_sigacts->ps_mtx); 1449 kern_sigprocmask(td, SIG_SETMASK, &newset, oldset, 1450 SIGPROCMASK_PROC_LOCKED); 1451 PROC_UNLOCK(p); 1452 } 1453 1454 void 1455 newnfs_restore_sigmask(struct thread *td, sigset_t *set) 1456 { 1457 if (td == NULL) 1458 td = curthread; /* XXX */ 1459 kern_sigprocmask(td, SIG_SETMASK, set, NULL, 0); 1460 } 1461 1462 /* 1463 * NFS wrapper to msleep(), that shoves a new p_sigmask and restores the 1464 * old one after msleep() returns. 1465 */ 1466 int 1467 newnfs_msleep(struct thread *td, void *ident, struct mtx *mtx, int priority, char *wmesg, int timo) 1468 { 1469 sigset_t oldset; 1470 int error; 1471 1472 if ((priority & PCATCH) == 0) 1473 return msleep(ident, mtx, priority, wmesg, timo); 1474 if (td == NULL) 1475 td = curthread; /* XXX */ 1476 newnfs_set_sigmask(td, &oldset); 1477 error = msleep(ident, mtx, priority, wmesg, timo); 1478 newnfs_restore_sigmask(td, &oldset); 1479 return (error); 1480 } 1481 1482 /* 1483 * Test for a termination condition pending on the process. 1484 * This is used for NFSMNT_INT mounts. 1485 */ 1486 int 1487 newnfs_sigintr(struct nfsmount *nmp, struct thread *td) 1488 { 1489 struct proc *p; 1490 sigset_t tmpset; 1491 1492 /* Terminate all requests while attempting a forced unmount. */ 1493 if (NFSCL_FORCEDISM(nmp->nm_mountp)) 1494 return (EIO); 1495 if (!(nmp->nm_flag & NFSMNT_INT)) 1496 return (0); 1497 if (td == NULL) 1498 return (0); 1499 p = td->td_proc; 1500 PROC_LOCK(p); 1501 tmpset = p->p_siglist; 1502 SIGSETOR(tmpset, td->td_siglist); 1503 SIGSETNAND(tmpset, td->td_sigmask); 1504 mtx_lock(&p->p_sigacts->ps_mtx); 1505 SIGSETNAND(tmpset, p->p_sigacts->ps_sigignore); 1506 mtx_unlock(&p->p_sigacts->ps_mtx); 1507 if ((SIGNOTEMPTY(p->p_siglist) || SIGNOTEMPTY(td->td_siglist)) 1508 && nfs_sig_pending(tmpset)) { 1509 PROC_UNLOCK(p); 1510 return (EINTR); 1511 } 1512 PROC_UNLOCK(p); 1513 return (0); 1514 } 1515 1516 static int 1517 nfs_msg(struct thread *td, const char *server, const char *msg, int error) 1518 { 1519 struct proc *p; 1520 1521 p = td ? td->td_proc : NULL; 1522 if (error) { 1523 tprintf(p, LOG_INFO, "nfs server %s: %s, error %d\n", 1524 server, msg, error); 1525 } else { 1526 tprintf(p, LOG_INFO, "nfs server %s: %s\n", server, msg); 1527 } 1528 return (0); 1529 } 1530 1531 static void 1532 nfs_down(struct nfsmount *nmp, struct thread *td, const char *msg, 1533 int error, int flags) 1534 { 1535 if (nmp == NULL) 1536 return; 1537 mtx_lock(&nmp->nm_mtx); 1538 if ((flags & NFSSTA_TIMEO) && !(nmp->nm_state & NFSSTA_TIMEO)) { 1539 nmp->nm_state |= NFSSTA_TIMEO; 1540 mtx_unlock(&nmp->nm_mtx); 1541 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid, 1542 VQ_NOTRESP, 0); 1543 } else 1544 mtx_unlock(&nmp->nm_mtx); 1545 mtx_lock(&nmp->nm_mtx); 1546 if ((flags & NFSSTA_LOCKTIMEO) && !(nmp->nm_state & NFSSTA_LOCKTIMEO)) { 1547 nmp->nm_state |= NFSSTA_LOCKTIMEO; 1548 mtx_unlock(&nmp->nm_mtx); 1549 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid, 1550 VQ_NOTRESPLOCK, 0); 1551 } else 1552 mtx_unlock(&nmp->nm_mtx); 1553 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, error); 1554 } 1555 1556 static void 1557 nfs_up(struct nfsmount *nmp, struct thread *td, const char *msg, 1558 int flags, int tprintfmsg) 1559 { 1560 if (nmp == NULL) 1561 return; 1562 if (tprintfmsg) { 1563 nfs_msg(td, nmp->nm_mountp->mnt_stat.f_mntfromname, msg, 0); 1564 } 1565 1566 mtx_lock(&nmp->nm_mtx); 1567 if ((flags & NFSSTA_TIMEO) && (nmp->nm_state & NFSSTA_TIMEO)) { 1568 nmp->nm_state &= ~NFSSTA_TIMEO; 1569 mtx_unlock(&nmp->nm_mtx); 1570 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid, 1571 VQ_NOTRESP, 1); 1572 } else 1573 mtx_unlock(&nmp->nm_mtx); 1574 1575 mtx_lock(&nmp->nm_mtx); 1576 if ((flags & NFSSTA_LOCKTIMEO) && (nmp->nm_state & NFSSTA_LOCKTIMEO)) { 1577 nmp->nm_state &= ~NFSSTA_LOCKTIMEO; 1578 mtx_unlock(&nmp->nm_mtx); 1579 vfs_event_signal(&nmp->nm_mountp->mnt_stat.f_fsid, 1580 VQ_NOTRESPLOCK, 1); 1581 } else 1582 mtx_unlock(&nmp->nm_mtx); 1583 }
Cache object: 46789febd27bb536c6d47a841e24def8
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