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. 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 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 33 * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $ 34 */ 35 36 /* 37 * Socket operations for use by nfs 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/proc.h> 43 #include <sys/malloc.h> 44 #include <sys/mount.h> 45 #include <sys/kernel.h> 46 #include <sys/mbuf.h> 47 #include <sys/vnode.h> 48 #include <sys/fcntl.h> 49 #include <sys/protosw.h> 50 #include <sys/resourcevar.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/socketops.h> 54 #include <sys/syslog.h> 55 #include <sys/thread.h> 56 #include <sys/tprintf.h> 57 #include <sys/sysctl.h> 58 #include <sys/signalvar.h> 59 60 #include <sys/signal2.h> 61 #include <sys/mutex2.h> 62 #include <sys/socketvar2.h> 63 64 #include <netinet/in.h> 65 #include <netinet/tcp.h> 66 #include <sys/thread2.h> 67 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 77 #define TRUE 1 78 #define FALSE 0 79 80 /* 81 * RTT calculations are scaled by 256 (8 bits). A proper fractional 82 * RTT will still be calculated even with a slow NFS timer. 83 */ 84 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum]] 85 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum]] 86 #define NFS_RTT_SCALE_BITS 8 /* bits */ 87 #define NFS_RTT_SCALE 256 /* value */ 88 89 /* 90 * Defines which timer to use for the procnum. 91 * 0 - default 92 * 1 - getattr 93 * 2 - lookup 94 * 3 - read 95 * 4 - write 96 */ 97 static int proct[NFS_NPROCS] = { 98 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, /* 00-09 */ 99 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, /* 10-19 */ 100 0, 5, 0, 0, 0, 0, /* 20-29 */ 101 }; 102 103 static int multt[NFS_NPROCS] = { 104 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00-09 */ 105 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10-19 */ 106 1, 2, 1, 1, 1, 1, /* 20-29 */ 107 }; 108 109 static int nfs_backoff[8] = { 2, 3, 5, 8, 13, 21, 34, 55 }; 110 static int nfs_realign_test; 111 static int nfs_realign_count; 112 static int nfs_showrtt; 113 static int nfs_showrexmit; 114 int nfs_maxasyncbio = NFS_MAXASYNCBIO; 115 116 SYSCTL_DECL(_vfs_nfs); 117 118 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, 119 "Number of times mbufs have been tested for bad alignment"); 120 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, 121 "Number of realignments for badly aligned mbuf data"); 122 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrtt, CTLFLAG_RW, &nfs_showrtt, 0, 123 "Show round trip time output"); 124 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrexmit, CTLFLAG_RW, &nfs_showrexmit, 0, 125 "Show retransmits info"); 126 SYSCTL_INT(_vfs_nfs, OID_AUTO, maxasyncbio, CTLFLAG_RW, &nfs_maxasyncbio, 0, 127 "Max number of asynchronous bio's"); 128 129 static int nfs_request_setup(nfsm_info_t info); 130 static int nfs_request_auth(struct nfsreq *rep); 131 static int nfs_request_try(struct nfsreq *rep); 132 static int nfs_request_waitreply(struct nfsreq *rep); 133 static int nfs_request_processreply(nfsm_info_t info, int); 134 135 int nfsrtton = 0; 136 struct nfsrtt nfsrtt; 137 struct callout nfs_timer_handle; 138 139 static int nfs_msg (struct thread *,char *,char *); 140 static int nfs_rcvlock (struct nfsmount *nmp, struct nfsreq *myreq); 141 static void nfs_rcvunlock (struct nfsmount *nmp); 142 static void nfs_realign (struct mbuf **pm, int hsiz); 143 static int nfs_receive (struct nfsmount *nmp, struct nfsreq *rep, 144 struct sockaddr **aname, struct mbuf **mp); 145 static void nfs_softterm (struct nfsreq *rep, int islocked); 146 static void nfs_hardterm (struct nfsreq *rep, int islocked); 147 static int nfs_reconnect (struct nfsmount *nmp, struct nfsreq *rep); 148 #ifndef NFS_NOSERVER 149 static int nfsrv_getstream (struct nfssvc_sock *, int, int *); 150 static void nfs_timer_req(struct nfsreq *req); 151 static void nfs_checkpkt(struct mbuf *m, int len); 152 153 int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd, 154 struct nfssvc_sock *slp, 155 struct thread *td, 156 struct mbuf **mreqp) = { 157 nfsrv_null, 158 nfsrv_getattr, 159 nfsrv_setattr, 160 nfsrv_lookup, 161 nfsrv3_access, 162 nfsrv_readlink, 163 nfsrv_read, 164 nfsrv_write, 165 nfsrv_create, 166 nfsrv_mkdir, 167 nfsrv_symlink, 168 nfsrv_mknod, 169 nfsrv_remove, 170 nfsrv_rmdir, 171 nfsrv_rename, 172 nfsrv_link, 173 nfsrv_readdir, 174 nfsrv_readdirplus, 175 nfsrv_statfs, 176 nfsrv_fsinfo, 177 nfsrv_pathconf, 178 nfsrv_commit, 179 nfsrv_noop, 180 nfsrv_noop, 181 nfsrv_noop, 182 nfsrv_noop 183 }; 184 #endif /* NFS_NOSERVER */ 185 186 /* 187 * Initialize sockets and congestion for a new NFS connection. 188 * We do not free the sockaddr if error. 189 */ 190 int 191 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep) 192 { 193 struct socket *so; 194 int error; 195 struct sockaddr *saddr; 196 struct sockaddr_in *sin; 197 struct thread *td = &thread0; /* only used for socreate and sobind */ 198 199 nmp->nm_so = so = NULL; 200 if (nmp->nm_flag & NFSMNT_FORCE) 201 return (EINVAL); 202 saddr = nmp->nm_nam; 203 error = socreate(saddr->sa_family, &so, nmp->nm_sotype, 204 nmp->nm_soproto, td); 205 if (error) 206 goto bad; 207 nmp->nm_soflags = so->so_proto->pr_flags; 208 209 /* 210 * Some servers require that the client port be a reserved port number. 211 */ 212 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 213 struct sockopt sopt; 214 int ip; 215 struct sockaddr_in ssin; 216 217 bzero(&sopt, sizeof sopt); 218 ip = IP_PORTRANGE_LOW; 219 sopt.sopt_level = IPPROTO_IP; 220 sopt.sopt_name = IP_PORTRANGE; 221 sopt.sopt_val = (void *)&ip; 222 sopt.sopt_valsize = sizeof(ip); 223 sopt.sopt_td = NULL; 224 error = sosetopt(so, &sopt); 225 if (error) 226 goto bad; 227 bzero(&ssin, sizeof ssin); 228 sin = &ssin; 229 sin->sin_len = sizeof (struct sockaddr_in); 230 sin->sin_family = AF_INET; 231 sin->sin_addr.s_addr = INADDR_ANY; 232 sin->sin_port = htons(0); 233 error = sobind(so, (struct sockaddr *)sin, td); 234 if (error) 235 goto bad; 236 bzero(&sopt, sizeof sopt); 237 ip = IP_PORTRANGE_DEFAULT; 238 sopt.sopt_level = IPPROTO_IP; 239 sopt.sopt_name = IP_PORTRANGE; 240 sopt.sopt_val = (void *)&ip; 241 sopt.sopt_valsize = sizeof(ip); 242 sopt.sopt_td = NULL; 243 error = sosetopt(so, &sopt); 244 if (error) 245 goto bad; 246 } 247 248 /* 249 * Protocols that do not require connections may be optionally left 250 * unconnected for servers that reply from a port other than NFS_PORT. 251 */ 252 if (nmp->nm_flag & NFSMNT_NOCONN) { 253 if (nmp->nm_soflags & PR_CONNREQUIRED) { 254 error = ENOTCONN; 255 goto bad; 256 } 257 } else { 258 error = soconnect(so, nmp->nm_nam, td, TRUE); 259 if (error) 260 goto bad; 261 262 /* 263 * Wait for the connection to complete. Cribbed from the 264 * connect system call but with the wait timing out so 265 * that interruptible mounts don't hang here for a long time. 266 */ 267 crit_enter(); 268 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 269 (void) tsleep((caddr_t)&so->so_timeo, 0, 270 "nfscon", 2 * hz); 271 if ((so->so_state & SS_ISCONNECTING) && 272 so->so_error == 0 && rep && 273 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){ 274 soclrstate(so, SS_ISCONNECTING); 275 crit_exit(); 276 goto bad; 277 } 278 } 279 if (so->so_error) { 280 error = so->so_error; 281 so->so_error = 0; 282 crit_exit(); 283 goto bad; 284 } 285 crit_exit(); 286 } 287 so->so_rcv.ssb_timeo = (5 * hz); 288 so->so_snd.ssb_timeo = (5 * hz); 289 290 /* 291 * Get buffer reservation size from sysctl, but impose reasonable 292 * limits. 293 */ 294 if (nmp->nm_sotype == SOCK_STREAM) { 295 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 296 struct sockopt sopt; 297 int val; 298 299 bzero(&sopt, sizeof sopt); 300 sopt.sopt_level = SOL_SOCKET; 301 sopt.sopt_name = SO_KEEPALIVE; 302 sopt.sopt_val = &val; 303 sopt.sopt_valsize = sizeof val; 304 val = 1; 305 sosetopt(so, &sopt); 306 } 307 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 308 struct sockopt sopt; 309 int val; 310 311 bzero(&sopt, sizeof sopt); 312 sopt.sopt_level = IPPROTO_TCP; 313 sopt.sopt_name = TCP_NODELAY; 314 sopt.sopt_val = &val; 315 sopt.sopt_valsize = sizeof val; 316 val = 1; 317 sosetopt(so, &sopt); 318 319 bzero(&sopt, sizeof sopt); 320 sopt.sopt_level = IPPROTO_TCP; 321 sopt.sopt_name = TCP_FASTKEEP; 322 sopt.sopt_val = &val; 323 sopt.sopt_valsize = sizeof val; 324 val = 1; 325 sosetopt(so, &sopt); 326 } 327 } 328 error = soreserve(so, nfs_soreserve, nfs_soreserve, NULL); 329 if (error) 330 goto bad; 331 atomic_set_int(&so->so_rcv.ssb_flags, SSB_NOINTR); 332 atomic_set_int(&so->so_snd.ssb_flags, SSB_NOINTR); 333 334 /* Initialize other non-zero congestion variables */ 335 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = 336 nmp->nm_srtt[3] = (NFS_TIMEO << NFS_RTT_SCALE_BITS); 337 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 338 nmp->nm_sdrtt[3] = 0; 339 nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED; 340 nmp->nm_timeouts = 0; 341 342 /* 343 * Assign nm_so last. The moment nm_so is assigned the nfs_timer() 344 * can mess with the socket. 345 */ 346 nmp->nm_so = so; 347 return (0); 348 349 bad: 350 if (so) { 351 soshutdown(so, SHUT_RDWR); 352 soclose(so, FNONBLOCK); 353 } 354 return (error); 355 } 356 357 /* 358 * Reconnect routine: 359 * Called when a connection is broken on a reliable protocol. 360 * - clean up the old socket 361 * - nfs_connect() again 362 * - set R_NEEDSXMIT for all outstanding requests on mount point 363 * If this fails the mount point is DEAD! 364 * nb: Must be called with the nfs_sndlock() set on the mount point. 365 */ 366 static int 367 nfs_reconnect(struct nfsmount *nmp, struct nfsreq *rep) 368 { 369 struct nfsreq *req; 370 int error; 371 372 nfs_disconnect(nmp); 373 if (nmp->nm_rxstate >= NFSSVC_STOPPING) 374 return (EINTR); 375 while ((error = nfs_connect(nmp, rep)) != 0) { 376 if (error == EINTR || error == ERESTART) 377 return (EINTR); 378 if (error == EINVAL) 379 return (error); 380 if (nmp->nm_rxstate >= NFSSVC_STOPPING) 381 return (EINTR); 382 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 383 } 384 385 /* 386 * Loop through outstanding request list and fix up all requests 387 * on old socket. 388 */ 389 crit_enter(); 390 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 391 KKASSERT(req->r_nmp == nmp); 392 req->r_flags |= R_NEEDSXMIT; 393 } 394 crit_exit(); 395 return (0); 396 } 397 398 /* 399 * NFS disconnect. Clean up and unlink. 400 */ 401 void 402 nfs_disconnect(struct nfsmount *nmp) 403 { 404 struct socket *so; 405 406 if (nmp->nm_so) { 407 so = nmp->nm_so; 408 nmp->nm_so = NULL; 409 soshutdown(so, SHUT_RDWR); 410 soclose(so, FNONBLOCK); 411 } 412 } 413 414 void 415 nfs_safedisconnect(struct nfsmount *nmp) 416 { 417 nfs_rcvlock(nmp, NULL); 418 nfs_disconnect(nmp); 419 nfs_rcvunlock(nmp); 420 } 421 422 /* 423 * This is the nfs send routine. For connection based socket types, it 424 * must be called with an nfs_sndlock() on the socket. 425 * "rep == NULL" indicates that it has been called from a server. 426 * For the client side: 427 * - return EINTR if the RPC is terminated, 0 otherwise 428 * - set R_NEEDSXMIT if the send fails for any reason 429 * - do any cleanup required by recoverable socket errors (?) 430 * For the server side: 431 * - return EINTR or ERESTART if interrupted by a signal 432 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 433 * - do any cleanup required by recoverable socket errors (?) 434 */ 435 int 436 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top, 437 struct nfsreq *rep) 438 { 439 struct sockaddr *sendnam; 440 int error, soflags, flags; 441 442 if (rep) { 443 if (rep->r_flags & R_SOFTTERM) { 444 m_freem(top); 445 return (EINTR); 446 } 447 if ((so = rep->r_nmp->nm_so) == NULL) { 448 rep->r_flags |= R_NEEDSXMIT; 449 m_freem(top); 450 return (0); 451 } 452 rep->r_flags &= ~R_NEEDSXMIT; 453 soflags = rep->r_nmp->nm_soflags; 454 } else { 455 soflags = so->so_proto->pr_flags; 456 } 457 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 458 sendnam = NULL; 459 else 460 sendnam = nam; 461 if (so->so_type == SOCK_SEQPACKET) 462 flags = MSG_EOR; 463 else 464 flags = 0; 465 466 /* 467 * calls pru_sosend -> sosend -> so_pru_send -> netrpc 468 */ 469 error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags, 470 curthread /*XXX*/); 471 472 /* 473 * ENOBUFS for dgram sockets is transient and non fatal. 474 * No need to log, and no need to break a soft mount. 475 */ 476 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 477 error = 0; 478 /* 479 * do backoff retransmit on client 480 */ 481 if (rep) { 482 if ((rep->r_nmp->nm_state & NFSSTA_SENDSPACE) == 0) { 483 rep->r_nmp->nm_state |= NFSSTA_SENDSPACE; 484 kprintf("Warning: NFS: Insufficient sendspace " 485 "(%lu),\n" 486 "\t You must increase vfs.nfs.soreserve" 487 "or decrease vfs.nfs.maxasyncbio\n", 488 so->so_snd.ssb_hiwat); 489 } 490 rep->r_flags |= R_NEEDSXMIT; 491 } 492 } 493 494 if (error) { 495 if (rep) { 496 log(LOG_INFO, "nfs send error %d for server %s\n",error, 497 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 498 /* 499 * Deal with errors for the client side. 500 */ 501 if (rep->r_flags & R_SOFTTERM) 502 error = EINTR; 503 else 504 rep->r_flags |= R_NEEDSXMIT; 505 } else { 506 log(LOG_INFO, "nfsd send error %d\n", error); 507 } 508 509 /* 510 * Handle any recoverable (soft) socket errors here. (?) 511 */ 512 if (error != EINTR && error != ERESTART && 513 error != EWOULDBLOCK && error != EPIPE) 514 error = 0; 515 } 516 return (error); 517 } 518 519 /* 520 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 521 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 522 * Mark and consolidate the data into a new mbuf list. 523 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 524 * small mbufs. 525 * For SOCK_STREAM we must be very careful to read an entire record once 526 * we have read any of it, even if the system call has been interrupted. 527 */ 528 static int 529 nfs_receive(struct nfsmount *nmp, struct nfsreq *rep, 530 struct sockaddr **aname, struct mbuf **mp) 531 { 532 struct socket *so; 533 struct sockbuf sio; 534 struct uio auio; 535 struct iovec aio; 536 struct mbuf *m; 537 struct mbuf *control; 538 u_int32_t len; 539 struct sockaddr **getnam; 540 int error, sotype, rcvflg; 541 struct thread *td = curthread; /* XXX */ 542 543 /* 544 * Set up arguments for soreceive() 545 */ 546 *mp = NULL; 547 *aname = NULL; 548 sotype = 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(nmp, rep); 560 if (error) 561 return (error); 562 tryagain: 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 && (rep->r_mrep || (rep->r_flags & R_SOFTTERM))) { 573 nfs_sndunlock(nmp); 574 return (EINTR); 575 } 576 so = nmp->nm_so; 577 if (so == NULL) { 578 error = nfs_reconnect(nmp, rep); 579 if (error) { 580 nfs_sndunlock(nmp); 581 return (error); 582 } 583 goto tryagain; 584 } 585 while (rep && (rep->r_flags & R_NEEDSXMIT)) { 586 m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); 587 nfsstats.rpcretries++; 588 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 589 if (error) { 590 if (error == EINTR || error == ERESTART || 591 (error = nfs_reconnect(nmp, rep)) != 0) { 592 nfs_sndunlock(nmp); 593 return (error); 594 } 595 goto tryagain; 596 } 597 } 598 nfs_sndunlock(nmp); 599 if (sotype == SOCK_STREAM) { 600 /* 601 * Get the length marker from the stream 602 */ 603 aio.iov_base = (caddr_t)&len; 604 aio.iov_len = sizeof(u_int32_t); 605 auio.uio_iov = &aio; 606 auio.uio_iovcnt = 1; 607 auio.uio_segflg = UIO_SYSSPACE; 608 auio.uio_rw = UIO_READ; 609 auio.uio_offset = 0; 610 auio.uio_resid = sizeof(u_int32_t); 611 auio.uio_td = td; 612 do { 613 rcvflg = MSG_WAITALL; 614 error = so_pru_soreceive(so, NULL, &auio, NULL, 615 NULL, &rcvflg); 616 if (error == EWOULDBLOCK && rep) { 617 if (rep->r_flags & R_SOFTTERM) 618 return (EINTR); 619 } 620 } while (error == EWOULDBLOCK); 621 622 if (error == 0 && auio.uio_resid > 0) { 623 /* 624 * Only log short packets if not EOF 625 */ 626 if (auio.uio_resid != sizeof(u_int32_t)) { 627 log(LOG_INFO, 628 "short receive (%d/%d) from nfs server %s\n", 629 (int)(sizeof(u_int32_t) - auio.uio_resid), 630 (int)sizeof(u_int32_t), 631 nmp->nm_mountp->mnt_stat.f_mntfromname); 632 } 633 error = EPIPE; 634 } 635 if (error) 636 goto errout; 637 len = ntohl(len) & ~0x80000000; 638 /* 639 * This is SERIOUS! We are out of sync with the sender 640 * and forcing a disconnect/reconnect is all I can do. 641 */ 642 if (len > NFS_MAXPACKET) { 643 log(LOG_ERR, "%s (%d) from nfs server %s\n", 644 "impossible packet length", 645 len, 646 nmp->nm_mountp->mnt_stat.f_mntfromname); 647 error = EFBIG; 648 goto errout; 649 } 650 651 /* 652 * Get the rest of the packet as an mbuf chain 653 */ 654 sbinit(&sio, len); 655 do { 656 rcvflg = MSG_WAITALL; 657 error = so_pru_soreceive(so, NULL, NULL, &sio, 658 NULL, &rcvflg); 659 } while (error == EWOULDBLOCK || error == EINTR || 660 error == ERESTART); 661 if (error == 0 && sio.sb_cc != len) { 662 if (sio.sb_cc != 0) { 663 log(LOG_INFO, 664 "short receive (%zu/%d) from nfs server %s\n", 665 (size_t)len - auio.uio_resid, len, 666 nmp->nm_mountp->mnt_stat.f_mntfromname); 667 } 668 error = EPIPE; 669 } 670 *mp = sio.sb_mb; 671 } else { 672 /* 673 * Non-stream, so get the whole packet by not 674 * specifying MSG_WAITALL and by specifying a large 675 * length. 676 * 677 * We have no use for control msg., but must grab them 678 * and then throw them away so we know what is going 679 * on. 680 */ 681 sbinit(&sio, 100000000); 682 do { 683 rcvflg = 0; 684 error = so_pru_soreceive(so, NULL, NULL, &sio, 685 &control, &rcvflg); 686 if (control) 687 m_freem(control); 688 if (error == EWOULDBLOCK && rep) { 689 if (rep->r_flags & R_SOFTTERM) { 690 m_freem(sio.sb_mb); 691 return (EINTR); 692 } 693 } 694 } while (error == EWOULDBLOCK || 695 (error == 0 && sio.sb_mb == NULL && control)); 696 if ((rcvflg & MSG_EOR) == 0) 697 kprintf("Egad!!\n"); 698 if (error == 0 && sio.sb_mb == NULL) 699 error = EPIPE; 700 len = sio.sb_cc; 701 *mp = sio.sb_mb; 702 } 703 errout: 704 if (error && error != EINTR && error != ERESTART) { 705 m_freem(*mp); 706 *mp = NULL; 707 if (error != EPIPE) { 708 log(LOG_INFO, 709 "receive error %d from nfs server %s\n", 710 error, 711 nmp->nm_mountp->mnt_stat.f_mntfromname); 712 } 713 error = nfs_sndlock(nmp, rep); 714 if (!error) { 715 error = nfs_reconnect(nmp, rep); 716 if (!error) 717 goto tryagain; 718 else 719 nfs_sndunlock(nmp); 720 } 721 } 722 } else { 723 if ((so = nmp->nm_so) == NULL) 724 return (EACCES); 725 if (so->so_state & SS_ISCONNECTED) 726 getnam = NULL; 727 else 728 getnam = aname; 729 sbinit(&sio, 100000000); 730 do { 731 rcvflg = 0; 732 error = so_pru_soreceive(so, getnam, NULL, &sio, 733 NULL, &rcvflg); 734 if (error == EWOULDBLOCK && rep && 735 (rep->r_flags & R_SOFTTERM)) { 736 m_freem(sio.sb_mb); 737 return (EINTR); 738 } 739 } while (error == EWOULDBLOCK); 740 741 len = sio.sb_cc; 742 *mp = sio.sb_mb; 743 744 /* 745 * A shutdown may result in no error and no mbuf. 746 * Convert to EPIPE. 747 */ 748 if (*mp == NULL && error == 0) 749 error = EPIPE; 750 } 751 if (error) { 752 m_freem(*mp); 753 *mp = NULL; 754 } 755 756 /* 757 * Search for any mbufs that are not a multiple of 4 bytes long 758 * or with m_data not longword aligned. 759 * These could cause pointer alignment problems, so copy them to 760 * well aligned mbufs. 761 */ 762 nfs_realign(mp, 5 * NFSX_UNSIGNED); 763 return (error); 764 } 765 766 /* 767 * Implement receipt of reply on a socket. 768 * 769 * We must search through the list of received datagrams matching them 770 * with outstanding requests using the xid, until ours is found. 771 * 772 * If myrep is NULL we process packets on the socket until 773 * interrupted or until nm_reqrxq is non-empty. 774 */ 775 /* ARGSUSED */ 776 int 777 nfs_reply(struct nfsmount *nmp, struct nfsreq *myrep) 778 { 779 struct nfsreq *rep; 780 struct sockaddr *nam; 781 u_int32_t rxid; 782 u_int32_t *tl; 783 int error; 784 struct nfsm_info info; 785 786 /* 787 * Loop around until we get our own reply 788 */ 789 for (;;) { 790 /* 791 * Lock against other receivers so that I don't get stuck in 792 * sbwait() after someone else has received my reply for me. 793 * Also necessary for connection based protocols to avoid 794 * race conditions during a reconnect. 795 * 796 * If nfs_rcvlock() returns EALREADY, that means that 797 * the reply has already been recieved by another 798 * process and we can return immediately. In this 799 * case, the lock is not taken to avoid races with 800 * other processes. 801 */ 802 info.mrep = NULL; 803 804 error = nfs_rcvlock(nmp, myrep); 805 if (error == EALREADY) 806 return (0); 807 if (error) 808 return (error); 809 810 /* 811 * If myrep is NULL we are the receiver helper thread. 812 * Stop waiting for incoming replies if there are 813 * messages sitting on reqrxq that we need to process, 814 * or if a shutdown request is pending. 815 */ 816 if (myrep == NULL && (TAILQ_FIRST(&nmp->nm_reqrxq) || 817 nmp->nm_rxstate > NFSSVC_PENDING)) { 818 nfs_rcvunlock(nmp); 819 return(EWOULDBLOCK); 820 } 821 822 /* 823 * Get the next Rpc reply off the socket 824 * 825 * We cannot release the receive lock until we've 826 * filled in rep->r_mrep, otherwise a waiting 827 * thread may deadlock in soreceive with no incoming 828 * packets expected. 829 */ 830 error = nfs_receive(nmp, myrep, &nam, &info.mrep); 831 if (error) { 832 /* 833 * Ignore routing errors on connectionless protocols?? 834 */ 835 nfs_rcvunlock(nmp); 836 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 837 if (nmp->nm_so == NULL) 838 return (error); 839 nmp->nm_so->so_error = 0; 840 continue; 841 } 842 return (error); 843 } 844 if (nam) 845 kfree(nam, M_SONAME); 846 847 /* 848 * Get the xid and check that it is an rpc reply 849 */ 850 info.md = info.mrep; 851 info.dpos = mtod(info.md, caddr_t); 852 NULLOUT(tl = nfsm_dissect(&info, 2*NFSX_UNSIGNED)); 853 rxid = *tl++; 854 if (*tl != rpc_reply) { 855 nfsstats.rpcinvalid++; 856 m_freem(info.mrep); 857 info.mrep = NULL; 858 nfsmout: 859 nfs_rcvunlock(nmp); 860 continue; 861 } 862 863 /* 864 * Loop through the request list to match up the reply 865 * Iff no match, just drop the datagram. On match, set 866 * r_mrep atomically to prevent the timer from messing 867 * around with the request after we have exited the critical 868 * section. 869 */ 870 crit_enter(); 871 TAILQ_FOREACH(rep, &nmp->nm_reqq, r_chain) { 872 if (rep->r_mrep == NULL && rxid == rep->r_xid) 873 break; 874 } 875 876 /* 877 * Fill in the rest of the reply if we found a match. 878 * 879 * Deal with duplicate responses if there was no match. 880 */ 881 if (rep) { 882 rep->r_md = info.md; 883 rep->r_dpos = info.dpos; 884 if (nfsrtton) { 885 struct rttl *rt; 886 887 rt = &nfsrtt.rttl[nfsrtt.pos]; 888 rt->proc = rep->r_procnum; 889 rt->rto = 0; 890 rt->sent = 0; 891 rt->cwnd = nmp->nm_maxasync_scaled; 892 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 893 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 894 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 895 getmicrotime(&rt->tstamp); 896 if (rep->r_flags & R_TIMING) 897 rt->rtt = rep->r_rtt; 898 else 899 rt->rtt = 1000000; 900 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 901 } 902 903 /* 904 * New congestion control is based only on async 905 * requests. 906 */ 907 if (nmp->nm_maxasync_scaled < NFS_MAXASYNC_SCALED) 908 ++nmp->nm_maxasync_scaled; 909 if (rep->r_flags & R_SENT) { 910 rep->r_flags &= ~R_SENT; 911 } 912 /* 913 * Update rtt using a gain of 0.125 on the mean 914 * and a gain of 0.25 on the deviation. 915 * 916 * NOTE SRTT/SDRTT are only good if R_TIMING is set. 917 */ 918 if ((rep->r_flags & R_TIMING) && rep->r_rexmit == 0) { 919 /* 920 * Since the timer resolution of 921 * NFS_HZ is so course, it can often 922 * result in r_rtt == 0. Since 923 * r_rtt == N means that the actual 924 * rtt is between N+dt and N+2-dt ticks, 925 * add 1. 926 */ 927 int n; 928 int d; 929 930 #define NFSRSB NFS_RTT_SCALE_BITS 931 n = ((NFS_SRTT(rep) * 7) + 932 (rep->r_rtt << NFSRSB)) >> 3; 933 d = n - NFS_SRTT(rep); 934 NFS_SRTT(rep) = n; 935 936 /* 937 * Don't let the jitter calculation decay 938 * too quickly, but we want a fast rampup. 939 */ 940 if (d < 0) 941 d = -d; 942 d <<= NFSRSB; 943 if (d < NFS_SDRTT(rep)) 944 n = ((NFS_SDRTT(rep) * 15) + d) >> 4; 945 else 946 n = ((NFS_SDRTT(rep) * 3) + d) >> 2; 947 NFS_SDRTT(rep) = n; 948 #undef NFSRSB 949 } 950 nmp->nm_timeouts = 0; 951 rep->r_mrep = info.mrep; 952 nfs_hardterm(rep, 0); 953 } else { 954 /* 955 * Extract vers, prog, nfsver, procnum. A duplicate 956 * response means we didn't wait long enough so 957 * we increase the SRTT to avoid future spurious 958 * timeouts. 959 */ 960 u_int procnum = nmp->nm_lastreprocnum; 961 int n; 962 963 if (procnum < NFS_NPROCS && proct[procnum]) { 964 if (nfs_showrexmit) 965 kprintf("D"); 966 n = nmp->nm_srtt[proct[procnum]]; 967 n += NFS_ASYSCALE * NFS_HZ; 968 if (n < NFS_ASYSCALE * NFS_HZ * 10) 969 n = NFS_ASYSCALE * NFS_HZ * 10; 970 nmp->nm_srtt[proct[procnum]] = n; 971 } 972 } 973 nfs_rcvunlock(nmp); 974 crit_exit(); 975 976 /* 977 * If not matched to a request, drop it. 978 * If it's mine, get out. 979 */ 980 if (rep == NULL) { 981 nfsstats.rpcunexpected++; 982 m_freem(info.mrep); 983 info.mrep = NULL; 984 } else if (rep == myrep) { 985 if (rep->r_mrep == NULL) 986 panic("nfsreply nil"); 987 return (0); 988 } 989 } 990 } 991 992 /* 993 * Run the request state machine until the target state is reached 994 * or a fatal error occurs. The target state is not run. Specifying 995 * a target of NFSM_STATE_DONE runs the state machine until the rpc 996 * is complete. 997 * 998 * EINPROGRESS is returned for all states other then the DONE state, 999 * indicating that the rpc is still in progress. 1000 */ 1001 int 1002 nfs_request(struct nfsm_info *info, nfsm_state_t bstate, nfsm_state_t estate) 1003 { 1004 struct nfsreq *req; 1005 1006 while (info->state >= bstate && info->state < estate) { 1007 switch(info->state) { 1008 case NFSM_STATE_SETUP: 1009 /* 1010 * Setup the nfsreq. Any error which occurs during 1011 * this state is fatal. 1012 */ 1013 info->error = nfs_request_setup(info); 1014 if (info->error) { 1015 info->state = NFSM_STATE_DONE; 1016 return (info->error); 1017 } else { 1018 req = info->req; 1019 req->r_mrp = &info->mrep; 1020 req->r_mdp = &info->md; 1021 req->r_dposp = &info->dpos; 1022 info->state = NFSM_STATE_AUTH; 1023 } 1024 break; 1025 case NFSM_STATE_AUTH: 1026 /* 1027 * Authenticate the nfsreq. Any error which occurs 1028 * during this state is fatal. 1029 */ 1030 info->error = nfs_request_auth(info->req); 1031 if (info->error) { 1032 info->state = NFSM_STATE_DONE; 1033 return (info->error); 1034 } else { 1035 info->state = NFSM_STATE_TRY; 1036 } 1037 break; 1038 case NFSM_STATE_TRY: 1039 /* 1040 * Transmit or retransmit attempt. An error in this 1041 * state is ignored and we always move on to the 1042 * next state. 1043 * 1044 * This can trivially race the receiver if the 1045 * request is asynchronous. nfs_request_try() 1046 * will thus set the state for us and we 1047 * must also return immediately if we are 1048 * running an async state machine, because 1049 * info can become invalid due to races after 1050 * try() returns. 1051 */ 1052 if (info->req->r_flags & R_ASYNC) { 1053 nfs_request_try(info->req); 1054 if (estate == NFSM_STATE_WAITREPLY) 1055 return (EINPROGRESS); 1056 } else { 1057 nfs_request_try(info->req); 1058 info->state = NFSM_STATE_WAITREPLY; 1059 } 1060 break; 1061 case NFSM_STATE_WAITREPLY: 1062 /* 1063 * Wait for a reply or timeout and move on to the 1064 * next state. The error returned by this state 1065 * is passed to the processing code in the next 1066 * state. 1067 */ 1068 info->error = nfs_request_waitreply(info->req); 1069 info->state = NFSM_STATE_PROCESSREPLY; 1070 break; 1071 case NFSM_STATE_PROCESSREPLY: 1072 /* 1073 * Process the reply or timeout. Errors which occur 1074 * in this state may cause the state machine to 1075 * go back to an earlier state, and are fatal 1076 * otherwise. 1077 */ 1078 info->error = nfs_request_processreply(info, 1079 info->error); 1080 switch(info->error) { 1081 case ENEEDAUTH: 1082 info->state = NFSM_STATE_AUTH; 1083 break; 1084 case EAGAIN: 1085 info->state = NFSM_STATE_TRY; 1086 break; 1087 default: 1088 /* 1089 * Operation complete, with or without an 1090 * error. We are done. 1091 */ 1092 info->req = NULL; 1093 info->state = NFSM_STATE_DONE; 1094 return (info->error); 1095 } 1096 break; 1097 case NFSM_STATE_DONE: 1098 /* 1099 * Shouldn't be reached 1100 */ 1101 return (info->error); 1102 /* NOT REACHED */ 1103 } 1104 } 1105 1106 /* 1107 * If we are done return the error code (if any). 1108 * Otherwise return EINPROGRESS. 1109 */ 1110 if (info->state == NFSM_STATE_DONE) 1111 return (info->error); 1112 return (EINPROGRESS); 1113 } 1114 1115 /* 1116 * nfs_request - goes something like this 1117 * - fill in request struct 1118 * - links it into list 1119 * - calls nfs_send() for first transmit 1120 * - calls nfs_receive() to get reply 1121 * - break down rpc header and return with nfs reply pointed to 1122 * by mrep or error 1123 * nb: always frees up mreq mbuf list 1124 */ 1125 static int 1126 nfs_request_setup(nfsm_info_t info) 1127 { 1128 struct nfsreq *req; 1129 struct nfsmount *nmp; 1130 struct mbuf *m; 1131 int i; 1132 1133 /* 1134 * Reject requests while attempting a forced unmount. 1135 */ 1136 if (info->vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { 1137 m_freem(info->mreq); 1138 info->mreq = NULL; 1139 return (EIO); 1140 } 1141 nmp = VFSTONFS(info->vp->v_mount); 1142 req = kmalloc(sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 1143 req->r_nmp = nmp; 1144 req->r_vp = info->vp; 1145 req->r_td = info->td; 1146 req->r_procnum = info->procnum; 1147 req->r_mreq = NULL; 1148 req->r_cred = info->cred; 1149 1150 i = 0; 1151 m = info->mreq; 1152 while (m) { 1153 i += m->m_len; 1154 m = m->m_next; 1155 } 1156 req->r_mrest = info->mreq; 1157 req->r_mrest_len = i; 1158 1159 /* 1160 * The presence of a non-NULL r_info in req indicates 1161 * async completion via our helper threads. See the receiver 1162 * code. 1163 */ 1164 if (info->bio) { 1165 req->r_info = info; 1166 req->r_flags = R_ASYNC; 1167 } else { 1168 req->r_info = NULL; 1169 req->r_flags = 0; 1170 } 1171 info->req = req; 1172 return(0); 1173 } 1174 1175 static int 1176 nfs_request_auth(struct nfsreq *rep) 1177 { 1178 struct nfsmount *nmp = rep->r_nmp; 1179 struct mbuf *m; 1180 char nickv[RPCX_NICKVERF]; 1181 int error = 0, auth_len, auth_type; 1182 int verf_len; 1183 u_int32_t xid; 1184 char *auth_str, *verf_str; 1185 struct ucred *cred; 1186 1187 cred = rep->r_cred; 1188 rep->r_failed_auth = 0; 1189 1190 /* 1191 * Get the RPC header with authorization. 1192 */ 1193 verf_str = auth_str = NULL; 1194 if (nmp->nm_flag & NFSMNT_KERB) { 1195 verf_str = nickv; 1196 verf_len = sizeof (nickv); 1197 auth_type = RPCAUTH_KERB4; 1198 bzero((caddr_t)rep->r_key, sizeof(rep->r_key)); 1199 if (rep->r_failed_auth || 1200 nfs_getnickauth(nmp, cred, &auth_str, &auth_len, 1201 verf_str, verf_len)) { 1202 error = nfs_getauth(nmp, rep, cred, &auth_str, 1203 &auth_len, verf_str, &verf_len, rep->r_key); 1204 if (error) { 1205 m_freem(rep->r_mrest); 1206 rep->r_mrest = NULL; 1207 kfree((caddr_t)rep, M_NFSREQ); 1208 return (error); 1209 } 1210 } 1211 } else { 1212 auth_type = RPCAUTH_UNIX; 1213 if (cred->cr_ngroups < 1) 1214 panic("nfsreq nogrps"); 1215 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 1216 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 1217 5 * NFSX_UNSIGNED; 1218 } 1219 if (rep->r_mrest) 1220 nfs_checkpkt(rep->r_mrest, rep->r_mrest_len); 1221 m = nfsm_rpchead(cred, nmp->nm_flag, rep->r_procnum, auth_type, 1222 auth_len, auth_str, verf_len, verf_str, 1223 rep->r_mrest, rep->r_mrest_len, &rep->r_mheadend, &xid); 1224 rep->r_mrest = NULL; 1225 if (auth_str) 1226 kfree(auth_str, M_TEMP); 1227 1228 /* 1229 * For stream protocols, insert a Sun RPC Record Mark. 1230 */ 1231 if (nmp->nm_sotype == SOCK_STREAM) { 1232 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT); 1233 if (m == NULL) { 1234 kfree(rep, M_NFSREQ); 1235 return (ENOBUFS); 1236 } 1237 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1238 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1239 } 1240 1241 nfs_checkpkt(m, m->m_pkthdr.len); 1242 1243 rep->r_mreq = m; 1244 rep->r_xid = xid; 1245 return (0); 1246 } 1247 1248 static int 1249 nfs_request_try(struct nfsreq *rep) 1250 { 1251 struct nfsmount *nmp = rep->r_nmp; 1252 struct mbuf *m2; 1253 int error; 1254 1255 /* 1256 * Request is not on any queue, only the owner has access to it 1257 * so it should not be locked by anyone atm. 1258 * 1259 * Interlock to prevent races. While locked the only remote 1260 * action possible is for r_mrep to be set (once we enqueue it). 1261 */ 1262 if (rep->r_flags == 0xdeadc0de) { 1263 print_backtrace(-1); 1264 panic("flags nbad"); 1265 } 1266 KKASSERT((rep->r_flags & (R_LOCKED | R_ONREQQ)) == 0); 1267 if (nmp->nm_flag & NFSMNT_SOFT) 1268 rep->r_retry = nmp->nm_retry; 1269 else 1270 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1271 rep->r_rtt = rep->r_rexmit = 0; 1272 if (proct[rep->r_procnum] > 0) 1273 rep->r_flags |= R_TIMING | R_LOCKED; 1274 else 1275 rep->r_flags |= R_LOCKED; 1276 rep->r_mrep = NULL; 1277 1278 nfsstats.rpcrequests++; 1279 1280 if (nmp->nm_flag & NFSMNT_FORCE) { 1281 rep->r_flags |= R_SOFTTERM; 1282 rep->r_flags &= ~R_LOCKED; 1283 return (0); 1284 } 1285 rep->r_flags |= R_NEEDSXMIT; /* in case send lock races us */ 1286 1287 /* 1288 * Do the client side RPC. 1289 * 1290 * Chain request into list of outstanding requests. Be sure 1291 * to put it LAST so timer finds oldest requests first. Note 1292 * that our control of R_LOCKED prevents the request from 1293 * getting ripped out from under us or transmitted by the 1294 * timer code. 1295 * 1296 * For requests with info structures we must atomically set the 1297 * info's state because the structure could become invalid upon 1298 * return due to races (i.e., if async) 1299 */ 1300 crit_enter(); 1301 mtx_link_init(&rep->r_link); 1302 KKASSERT((rep->r_flags & R_ONREQQ) == 0); 1303 TAILQ_INSERT_TAIL(&nmp->nm_reqq, rep, r_chain); 1304 rep->r_flags |= R_ONREQQ; 1305 ++nmp->nm_reqqlen; 1306 if (rep->r_flags & R_ASYNC) 1307 rep->r_info->state = NFSM_STATE_WAITREPLY; 1308 crit_exit(); 1309 1310 error = 0; 1311 1312 /* 1313 * Send if we can. Congestion control is not handled here any more 1314 * becausing trying to defer the initial send based on the nfs_timer 1315 * requires having a very fast nfs_timer, which is silly. 1316 */ 1317 if (nmp->nm_so) { 1318 if (nmp->nm_soflags & PR_CONNREQUIRED) 1319 error = nfs_sndlock(nmp, rep); 1320 if (error == 0 && (rep->r_flags & R_NEEDSXMIT)) { 1321 m2 = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); 1322 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); 1323 rep->r_flags &= ~R_NEEDSXMIT; 1324 if ((rep->r_flags & R_SENT) == 0) { 1325 rep->r_flags |= R_SENT; 1326 } 1327 if (nmp->nm_soflags & PR_CONNREQUIRED) 1328 nfs_sndunlock(nmp); 1329 } 1330 } else { 1331 rep->r_rtt = -1; 1332 } 1333 if (error == EPIPE) 1334 error = 0; 1335 1336 /* 1337 * Release the lock. The only remote action that may have occurred 1338 * would have been the setting of rep->r_mrep. If this occured 1339 * and the request was async we have to move it to the reader 1340 * thread's queue for action. 1341 * 1342 * For async requests also make sure the reader is woken up so 1343 * it gets on the socket to read responses. 1344 */ 1345 crit_enter(); 1346 if (rep->r_flags & R_ASYNC) { 1347 if (rep->r_mrep) 1348 nfs_hardterm(rep, 1); 1349 rep->r_flags &= ~R_LOCKED; 1350 nfssvc_iod_reader_wakeup(nmp); 1351 } else { 1352 rep->r_flags &= ~R_LOCKED; 1353 } 1354 if (rep->r_flags & R_WANTED) { 1355 rep->r_flags &= ~R_WANTED; 1356 wakeup(rep); 1357 } 1358 crit_exit(); 1359 return (error); 1360 } 1361 1362 /* 1363 * This code is only called for synchronous requests. Completed synchronous 1364 * requests are left on reqq and we remove them before moving on to the 1365 * processing state. 1366 */ 1367 static int 1368 nfs_request_waitreply(struct nfsreq *rep) 1369 { 1370 struct nfsmount *nmp = rep->r_nmp; 1371 int error; 1372 1373 KKASSERT((rep->r_flags & R_ASYNC) == 0); 1374 1375 /* 1376 * Wait until the request is finished. 1377 */ 1378 error = nfs_reply(nmp, rep); 1379 1380 /* 1381 * RPC done, unlink the request, but don't rip it out from under 1382 * the callout timer. 1383 * 1384 * Once unlinked no other receiver or the timer will have 1385 * visibility, so we do not have to set R_LOCKED. 1386 */ 1387 crit_enter(); 1388 while (rep->r_flags & R_LOCKED) { 1389 rep->r_flags |= R_WANTED; 1390 tsleep(rep, 0, "nfstrac", 0); 1391 } 1392 KKASSERT(rep->r_flags & R_ONREQQ); 1393 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain); 1394 rep->r_flags &= ~R_ONREQQ; 1395 --nmp->nm_reqqlen; 1396 if (TAILQ_FIRST(&nmp->nm_bioq) && 1397 nmp->nm_reqqlen <= nfs_maxasyncbio * 2 / 3) { 1398 nfssvc_iod_writer_wakeup(nmp); 1399 } 1400 crit_exit(); 1401 1402 /* 1403 * Decrement the outstanding request count. 1404 */ 1405 if (rep->r_flags & R_SENT) { 1406 rep->r_flags &= ~R_SENT; 1407 } 1408 return (error); 1409 } 1410 1411 /* 1412 * Process reply with error returned from nfs_requet_waitreply(). 1413 * 1414 * Returns EAGAIN if it wants us to loop up to nfs_request_try() again. 1415 * Returns ENEEDAUTH if it wants us to loop up to nfs_request_auth() again. 1416 */ 1417 static int 1418 nfs_request_processreply(nfsm_info_t info, int error) 1419 { 1420 struct nfsreq *req = info->req; 1421 struct nfsmount *nmp = req->r_nmp; 1422 u_int32_t *tl; 1423 int verf_type; 1424 int i; 1425 1426 /* 1427 * If there was a successful reply and a tprintf msg. 1428 * tprintf a response. 1429 */ 1430 if (error == 0 && (req->r_flags & R_TPRINTFMSG)) { 1431 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1432 "is alive again"); 1433 } 1434 info->mrep = req->r_mrep; 1435 info->md = req->r_md; 1436 info->dpos = req->r_dpos; 1437 if (error) { 1438 m_freem(req->r_mreq); 1439 req->r_mreq = NULL; 1440 kfree(req, M_NFSREQ); 1441 info->req = NULL; 1442 return (error); 1443 } 1444 1445 /* 1446 * break down the rpc header and check if ok 1447 */ 1448 NULLOUT(tl = nfsm_dissect(info, 3 * NFSX_UNSIGNED)); 1449 if (*tl++ == rpc_msgdenied) { 1450 if (*tl == rpc_mismatch) { 1451 error = EOPNOTSUPP; 1452 } else if ((nmp->nm_flag & NFSMNT_KERB) && 1453 *tl++ == rpc_autherr) { 1454 if (req->r_failed_auth == 0) { 1455 req->r_failed_auth++; 1456 req->r_mheadend->m_next = NULL; 1457 m_freem(info->mrep); 1458 info->mrep = NULL; 1459 m_freem(req->r_mreq); 1460 req->r_mreq = NULL; 1461 return (ENEEDAUTH); 1462 } else { 1463 error = EAUTH; 1464 } 1465 } else { 1466 error = EACCES; 1467 } 1468 m_freem(info->mrep); 1469 info->mrep = NULL; 1470 m_freem(req->r_mreq); 1471 req->r_mreq = NULL; 1472 kfree(req, M_NFSREQ); 1473 info->req = NULL; 1474 return (error); 1475 } 1476 1477 /* 1478 * Grab any Kerberos verifier, otherwise just throw it away. 1479 */ 1480 verf_type = fxdr_unsigned(int, *tl++); 1481 i = fxdr_unsigned(int32_t, *tl); 1482 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1483 error = nfs_savenickauth(nmp, req->r_cred, i, req->r_key, 1484 &info->md, &info->dpos, info->mrep); 1485 if (error) 1486 goto nfsmout; 1487 } else if (i > 0) { 1488 ERROROUT(nfsm_adv(info, nfsm_rndup(i))); 1489 } 1490 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED)); 1491 /* 0 == ok */ 1492 if (*tl == 0) { 1493 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED)); 1494 if (*tl != 0) { 1495 error = fxdr_unsigned(int, *tl); 1496 1497 /* 1498 * Does anyone even implement this? Just impose 1499 * a 1-second delay. 1500 */ 1501 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1502 error == NFSERR_TRYLATER) { 1503 m_freem(info->mrep); 1504 info->mrep = NULL; 1505 error = 0; 1506 1507 tsleep((caddr_t)&lbolt, 0, "nqnfstry", 0); 1508 return (EAGAIN); /* goto tryagain */ 1509 } 1510 1511 #if 0 1512 /* 1513 * XXX We can't do this here any more because the 1514 * caller may be holding a shared lock on the 1515 * namecache entry. 1516 * 1517 * If the File Handle was stale, invalidate the 1518 * lookup cache, just in case. 1519 * 1520 * To avoid namecache<->vnode deadlocks we must 1521 * release the vnode lock if we hold it. 1522 */ 1523 if (error == ESTALE) { 1524 struct vnode *vp = req->r_vp; 1525 int ltype; 1526 1527 ltype = lockstatus(&vp->v_lock, curthread); 1528 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1529 lockmgr(&vp->v_lock, LK_RELEASE); 1530 cache_inval_vp(vp, CINV_CHILDREN); 1531 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1532 lockmgr(&vp->v_lock, ltype); 1533 } 1534 #endif 1535 if (nmp->nm_flag & NFSMNT_NFSV3) { 1536 KKASSERT(*req->r_mrp == info->mrep); 1537 KKASSERT(*req->r_mdp == info->md); 1538 KKASSERT(*req->r_dposp == info->dpos); 1539 error |= NFSERR_RETERR; 1540 } else { 1541 m_freem(info->mrep); 1542 info->mrep = NULL; 1543 } 1544 m_freem(req->r_mreq); 1545 req->r_mreq = NULL; 1546 kfree(req, M_NFSREQ); 1547 info->req = NULL; 1548 return (error); 1549 } 1550 1551 KKASSERT(*req->r_mrp == info->mrep); 1552 KKASSERT(*req->r_mdp == info->md); 1553 KKASSERT(*req->r_dposp == info->dpos); 1554 m_freem(req->r_mreq); 1555 req->r_mreq = NULL; 1556 kfree(req, M_NFSREQ); 1557 return (0); 1558 } 1559 m_freem(info->mrep); 1560 info->mrep = NULL; 1561 error = EPROTONOSUPPORT; 1562 nfsmout: 1563 m_freem(req->r_mreq); 1564 req->r_mreq = NULL; 1565 kfree(req, M_NFSREQ); 1566 info->req = NULL; 1567 return (error); 1568 } 1569 1570 #ifndef NFS_NOSERVER 1571 /* 1572 * Generate the rpc reply header 1573 * siz arg. is used to decide if adding a cluster is worthwhile 1574 */ 1575 int 1576 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, 1577 int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp) 1578 { 1579 u_int32_t *tl; 1580 struct nfsm_info info; 1581 1582 siz += RPC_REPLYSIZ; 1583 info.mb = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL); 1584 info.mreq = info.mb; 1585 info.mreq->m_pkthdr.len = 0; 1586 /* 1587 * If this is not a cluster, try and leave leading space 1588 * for the lower level headers. 1589 */ 1590 if ((max_hdr + siz) < MINCLSIZE) 1591 info.mreq->m_data += max_hdr; 1592 tl = mtod(info.mreq, u_int32_t *); 1593 info.mreq->m_len = 6 * NFSX_UNSIGNED; 1594 info.bpos = ((caddr_t)tl) + info.mreq->m_len; 1595 *tl++ = txdr_unsigned(nd->nd_retxid); 1596 *tl++ = rpc_reply; 1597 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1598 *tl++ = rpc_msgdenied; 1599 if (err & NFSERR_AUTHERR) { 1600 *tl++ = rpc_autherr; 1601 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1602 info.mreq->m_len -= NFSX_UNSIGNED; 1603 info.bpos -= NFSX_UNSIGNED; 1604 } else { 1605 *tl++ = rpc_mismatch; 1606 *tl++ = txdr_unsigned(RPC_VER2); 1607 *tl = txdr_unsigned(RPC_VER2); 1608 } 1609 } else { 1610 *tl++ = rpc_msgaccepted; 1611 1612 /* 1613 * For Kerberos authentication, we must send the nickname 1614 * verifier back, otherwise just RPCAUTH_NULL. 1615 */ 1616 if (nd->nd_flag & ND_KERBFULL) { 1617 struct nfsuid *nuidp; 1618 struct timeval ktvout; 1619 1620 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1621 nuidp != NULL; nuidp = nuidp->nu_hash.le_next) { 1622 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1623 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1624 &nuidp->nu_haddr, nd->nd_nam2))) 1625 break; 1626 } 1627 if (nuidp) { 1628 /* 1629 * Encrypt the timestamp in ecb mode using the 1630 * session key. 1631 */ 1632 #ifdef NFSKERB 1633 XXX 1634 #else 1635 ktvout.tv_sec = 0; 1636 ktvout.tv_usec = 0; 1637 #endif 1638 1639 *tl++ = rpc_auth_kerb; 1640 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1641 *tl = ktvout.tv_sec; 1642 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED); 1643 *tl++ = ktvout.tv_usec; 1644 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1645 } else { 1646 *tl++ = 0; 1647 *tl++ = 0; 1648 } 1649 } else { 1650 *tl++ = 0; 1651 *tl++ = 0; 1652 } 1653 switch (err) { 1654 case EPROGUNAVAIL: 1655 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1656 break; 1657 case EPROGMISMATCH: 1658 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1659 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 1660 *tl++ = txdr_unsigned(2); 1661 *tl = txdr_unsigned(3); 1662 break; 1663 case EPROCUNAVAIL: 1664 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1665 break; 1666 case EBADRPC: 1667 *tl = txdr_unsigned(RPC_GARBAGE); 1668 break; 1669 default: 1670 *tl = 0; 1671 if (err != NFSERR_RETVOID) { 1672 tl = nfsm_build(&info, NFSX_UNSIGNED); 1673 if (err) 1674 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1675 else 1676 *tl = 0; 1677 } 1678 break; 1679 }; 1680 } 1681 1682 if (mrq != NULL) 1683 *mrq = info.mreq; 1684 *mbp = info.mb; 1685 *bposp = info.bpos; 1686 if (err != 0 && err != NFSERR_RETVOID) 1687 nfsstats.srvrpc_errs++; 1688 return (0); 1689 } 1690 1691 1692 #endif /* NFS_NOSERVER */ 1693 1694 /* 1695 * Nfs timer routine. 1696 * 1697 * Scan the nfsreq list and retranmit any requests that have timed out 1698 * To avoid retransmission attempts on STREAM sockets (in the future) make 1699 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1700 * 1701 * Requests with attached responses, terminated requests, and 1702 * locked requests are ignored. Locked requests will be picked up 1703 * in a later timer call. 1704 */ 1705 void 1706 nfs_timer_callout(void *arg /* never used */) 1707 { 1708 struct nfsmount *nmp; 1709 struct nfsreq *req; 1710 #ifndef NFS_NOSERVER 1711 struct nfssvc_sock *slp; 1712 u_quad_t cur_usec; 1713 #endif /* NFS_NOSERVER */ 1714 1715 lwkt_gettoken(&nfs_token); 1716 TAILQ_FOREACH(nmp, &nfs_mountq, nm_entry) { 1717 lwkt_gettoken(&nmp->nm_token); 1718 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1719 KKASSERT(nmp == req->r_nmp); 1720 if (req->r_mrep) 1721 continue; 1722 if (req->r_flags & (R_SOFTTERM | R_LOCKED)) 1723 continue; 1724 1725 /* 1726 * Handle timeout/retry. Be sure to process r_mrep 1727 * for async requests that completed while we had 1728 * the request locked or they will hang in the reqq 1729 * forever. 1730 */ 1731 req->r_flags |= R_LOCKED; 1732 if (nfs_sigintr(nmp, req, req->r_td)) { 1733 nfs_softterm(req, 1); 1734 req->r_flags &= ~R_LOCKED; 1735 } else { 1736 nfs_timer_req(req); 1737 if (req->r_flags & R_ASYNC) { 1738 if (req->r_mrep) 1739 nfs_hardterm(req, 1); 1740 req->r_flags &= ~R_LOCKED; 1741 nfssvc_iod_reader_wakeup(nmp); 1742 } else { 1743 req->r_flags &= ~R_LOCKED; 1744 } 1745 } 1746 if (req->r_flags & R_WANTED) { 1747 req->r_flags &= ~R_WANTED; 1748 wakeup(req); 1749 } 1750 } 1751 lwkt_reltoken(&nmp->nm_token); 1752 } 1753 #ifndef NFS_NOSERVER 1754 1755 /* 1756 * Scan the write gathering queues for writes that need to be 1757 * completed now. 1758 */ 1759 cur_usec = nfs_curusec(); 1760 1761 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1762 /* XXX race against removal */ 1763 if (lwkt_trytoken(&slp->ns_token)) { 1764 if (slp->ns_tq.lh_first && 1765 (slp->ns_tq.lh_first->nd_time <= cur_usec)) { 1766 nfsrv_wakenfsd(slp, 1); 1767 } 1768 lwkt_reltoken(&slp->ns_token); 1769 } 1770 } 1771 #endif /* NFS_NOSERVER */ 1772 1773 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer_callout, NULL); 1774 lwkt_reltoken(&nfs_token); 1775 } 1776 1777 static 1778 void 1779 nfs_timer_req(struct nfsreq *req) 1780 { 1781 struct thread *td = &thread0; /* XXX for creds, will break if sleep */ 1782 struct nfsmount *nmp = req->r_nmp; 1783 struct mbuf *m; 1784 struct socket *so; 1785 int timeo; 1786 int error; 1787 1788 /* 1789 * rtt ticks and timeout calculation. Return if the timeout 1790 * has not been reached yet, unless the packet is flagged 1791 * for an immediate send. 1792 * 1793 * The mean rtt doesn't help when we get random I/Os, we have 1794 * to multiply by fairly large numbers. 1795 */ 1796 if (req->r_rtt >= 0) { 1797 /* 1798 * Calculate the timeout to test against. 1799 */ 1800 req->r_rtt++; 1801 if (nmp->nm_flag & NFSMNT_DUMBTIMR) { 1802 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS; 1803 } else if (req->r_flags & R_TIMING) { 1804 timeo = NFS_SRTT(req) + NFS_SDRTT(req); 1805 } else { 1806 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS; 1807 } 1808 timeo *= multt[req->r_procnum]; 1809 /* timeo is still scaled by SCALE_BITS */ 1810 1811 #define NFSFS (NFS_RTT_SCALE * NFS_HZ) 1812 if (req->r_flags & R_TIMING) { 1813 static long last_time; 1814 if (nfs_showrtt && last_time != time_uptime) { 1815 kprintf("rpccmd %d NFS SRTT %d SDRTT %d " 1816 "timeo %d.%03d\n", 1817 proct[req->r_procnum], 1818 NFS_SRTT(req), NFS_SDRTT(req), 1819 timeo / NFSFS, 1820 timeo % NFSFS * 1000 / NFSFS); 1821 last_time = time_uptime; 1822 } 1823 } 1824 #undef NFSFS 1825 1826 /* 1827 * deal with nfs_timer jitter. 1828 */ 1829 timeo = (timeo >> NFS_RTT_SCALE_BITS) + 1; 1830 if (timeo < 2) 1831 timeo = 2; 1832 1833 if (nmp->nm_timeouts > 0) 1834 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1835 if (timeo > NFS_MAXTIMEO) 1836 timeo = NFS_MAXTIMEO; 1837 if (req->r_rtt <= timeo) { 1838 if ((req->r_flags & R_NEEDSXMIT) == 0) 1839 return; 1840 } else if (nmp->nm_timeouts < 8) { 1841 nmp->nm_timeouts++; 1842 } 1843 } 1844 1845 /* 1846 * Check for server not responding 1847 */ 1848 if ((req->r_flags & R_TPRINTFMSG) == 0 && 1849 req->r_rexmit > nmp->nm_deadthresh) { 1850 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1851 "not responding"); 1852 req->r_flags |= R_TPRINTFMSG; 1853 } 1854 if (req->r_rexmit >= req->r_retry) { /* too many */ 1855 nfsstats.rpctimeouts++; 1856 nfs_softterm(req, 1); 1857 return; 1858 } 1859 1860 /* 1861 * Generally disable retransmission on reliable sockets, 1862 * unless the request is flagged for immediate send. 1863 */ 1864 if (nmp->nm_sotype != SOCK_DGRAM) { 1865 if (++req->r_rexmit > NFS_MAXREXMIT) 1866 req->r_rexmit = NFS_MAXREXMIT; 1867 if ((req->r_flags & R_NEEDSXMIT) == 0) 1868 return; 1869 } 1870 1871 /* 1872 * Stop here if we do not have a socket! 1873 */ 1874 if ((so = nmp->nm_so) == NULL) 1875 return; 1876 1877 /* 1878 * If there is enough space and the window allows.. resend it. 1879 * 1880 * r_rtt is left intact in case we get an answer after the 1881 * retry that was a reply to the original packet. 1882 * 1883 * NOTE: so_pru_send() 1884 */ 1885 if (ssb_space(&so->so_snd) >= req->r_mreq->m_pkthdr.len && 1886 (req->r_flags & (R_SENT | R_NEEDSXMIT)) && 1887 (m = m_copym(req->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){ 1888 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1889 error = so_pru_send(so, 0, m, NULL, NULL, td); 1890 else 1891 error = so_pru_send(so, 0, m, nmp->nm_nam, NULL, td); 1892 if (error) { 1893 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1894 so->so_error = 0; 1895 req->r_flags |= R_NEEDSXMIT; 1896 } else if (req->r_mrep == NULL) { 1897 /* 1898 * Iff first send, start timing 1899 * else turn timing off, backoff timer 1900 * and divide congestion window by 2. 1901 * 1902 * It is possible for the so_pru_send() to 1903 * block and for us to race a reply so we 1904 * only do this if the reply field has not 1905 * been filled in. R_LOCKED will prevent 1906 * the request from being ripped out from under 1907 * us entirely. 1908 * 1909 * Record the last resent procnum to aid us 1910 * in duplicate detection on receive. 1911 */ 1912 if ((req->r_flags & R_NEEDSXMIT) == 0) { 1913 if (nfs_showrexmit) 1914 kprintf("X"); 1915 if (++req->r_rexmit > NFS_MAXREXMIT) 1916 req->r_rexmit = NFS_MAXREXMIT; 1917 nmp->nm_maxasync_scaled >>= 1; 1918 if (nmp->nm_maxasync_scaled < NFS_MINASYNC_SCALED) 1919 nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED; 1920 nfsstats.rpcretries++; 1921 nmp->nm_lastreprocnum = req->r_procnum; 1922 } else { 1923 req->r_flags |= R_SENT; 1924 req->r_flags &= ~R_NEEDSXMIT; 1925 } 1926 } 1927 } 1928 } 1929 1930 /* 1931 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1932 * wait for all requests to complete. This is used by forced unmounts 1933 * to terminate any outstanding RPCs. 1934 * 1935 * Locked requests cannot be canceled but will be marked for 1936 * soft-termination. 1937 */ 1938 int 1939 nfs_nmcancelreqs(struct nfsmount *nmp) 1940 { 1941 struct nfsreq *req; 1942 int i; 1943 1944 crit_enter(); 1945 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1946 if (req->r_mrep != NULL || (req->r_flags & R_SOFTTERM)) 1947 continue; 1948 nfs_softterm(req, 0); 1949 } 1950 /* XXX the other two queues as well */ 1951 crit_exit(); 1952 1953 for (i = 0; i < 30; i++) { 1954 crit_enter(); 1955 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1956 if (nmp == req->r_nmp) 1957 break; 1958 } 1959 crit_exit(); 1960 if (req == NULL) 1961 return (0); 1962 tsleep(&lbolt, 0, "nfscancel", 0); 1963 } 1964 return (EBUSY); 1965 } 1966 1967 /* 1968 * Soft-terminate a request, effectively marking it as failed. 1969 * 1970 * Must be called from within a critical section. 1971 */ 1972 static void 1973 nfs_softterm(struct nfsreq *rep, int islocked) 1974 { 1975 rep->r_flags |= R_SOFTTERM; 1976 nfs_hardterm(rep, islocked); 1977 } 1978 1979 /* 1980 * Hard-terminate a request, typically after getting a response. 1981 * 1982 * The state machine can still decide to re-issue it later if necessary. 1983 * 1984 * Must be called from within a critical section. 1985 */ 1986 static void 1987 nfs_hardterm(struct nfsreq *rep, int islocked) 1988 { 1989 struct nfsmount *nmp = rep->r_nmp; 1990 1991 /* 1992 * The nm_send count is decremented now to avoid deadlocks 1993 * when the process in soreceive() hasn't yet managed to send 1994 * its own request. 1995 */ 1996 if (rep->r_flags & R_SENT) { 1997 rep->r_flags &= ~R_SENT; 1998 } 1999 2000 /* 2001 * If we locked the request or nobody else has locked the request, 2002 * and the request is async, we can move it to the reader thread's 2003 * queue now and fix up the state. 2004 * 2005 * If we locked the request or nobody else has locked the request, 2006 * we can wake up anyone blocked waiting for a response on the 2007 * request. 2008 */ 2009 if (islocked || (rep->r_flags & R_LOCKED) == 0) { 2010 if ((rep->r_flags & (R_ONREQQ | R_ASYNC)) == 2011 (R_ONREQQ | R_ASYNC)) { 2012 rep->r_flags &= ~R_ONREQQ; 2013 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain); 2014 --nmp->nm_reqqlen; 2015 TAILQ_INSERT_TAIL(&nmp->nm_reqrxq, rep, r_chain); 2016 KKASSERT(rep->r_info->state == NFSM_STATE_TRY || 2017 rep->r_info->state == NFSM_STATE_WAITREPLY); 2018 rep->r_info->state = NFSM_STATE_PROCESSREPLY; 2019 nfssvc_iod_reader_wakeup(nmp); 2020 if (TAILQ_FIRST(&nmp->nm_bioq) && 2021 nmp->nm_reqqlen <= nfs_maxasyncbio * 2 / 3) { 2022 nfssvc_iod_writer_wakeup(nmp); 2023 } 2024 } 2025 mtx_abort_ex_link(&nmp->nm_rxlock, &rep->r_link); 2026 } 2027 } 2028 2029 /* 2030 * Test for a termination condition pending on the process. 2031 * This is used for NFSMNT_INT mounts. 2032 */ 2033 int 2034 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td) 2035 { 2036 sigset_t tmpset; 2037 struct proc *p; 2038 struct lwp *lp; 2039 2040 if (rep && (rep->r_flags & R_SOFTTERM)) 2041 return (EINTR); 2042 /* Terminate all requests while attempting a forced unmount. */ 2043 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) 2044 return (EINTR); 2045 if (!(nmp->nm_flag & NFSMNT_INT)) 2046 return (0); 2047 /* td might be NULL YYY */ 2048 if (td == NULL || (p = td->td_proc) == NULL) 2049 return (0); 2050 2051 lp = td->td_lwp; 2052 tmpset = lwp_sigpend(lp); 2053 SIGSETNAND(tmpset, lp->lwp_sigmask); 2054 SIGSETNAND(tmpset, p->p_sigignore); 2055 if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset)) 2056 return (EINTR); 2057 2058 return (0); 2059 } 2060 2061 /* 2062 * Lock a socket against others. 2063 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 2064 * and also to avoid race conditions between the processes with nfs requests 2065 * in progress when a reconnect is necessary. 2066 */ 2067 int 2068 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) 2069 { 2070 mtx_t mtx = &nmp->nm_txlock; 2071 struct thread *td; 2072 int slptimeo; 2073 int slpflag; 2074 int error; 2075 2076 slpflag = 0; 2077 slptimeo = 0; 2078 td = rep ? rep->r_td : NULL; 2079 if (nmp->nm_flag & NFSMNT_INT) 2080 slpflag = PCATCH; 2081 2082 while ((error = mtx_lock_ex_try(mtx)) != 0) { 2083 if (nfs_sigintr(nmp, rep, td)) { 2084 error = EINTR; 2085 break; 2086 } 2087 error = mtx_lock_ex(mtx, "nfsndlck", slpflag, slptimeo); 2088 if (error == 0) 2089 break; 2090 if (slpflag == PCATCH) { 2091 slpflag = 0; 2092 slptimeo = 2 * hz; 2093 } 2094 } 2095 /* Always fail if our request has been cancelled. */ 2096 if (rep && (rep->r_flags & R_SOFTTERM)) { 2097 if (error == 0) 2098 mtx_unlock(mtx); 2099 error = EINTR; 2100 } 2101 return (error); 2102 } 2103 2104 /* 2105 * Unlock the stream socket for others. 2106 */ 2107 void 2108 nfs_sndunlock(struct nfsmount *nmp) 2109 { 2110 mtx_unlock(&nmp->nm_txlock); 2111 } 2112 2113 /* 2114 * Lock the receiver side of the socket. 2115 * 2116 * rep may be NULL. 2117 */ 2118 static int 2119 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep) 2120 { 2121 mtx_t mtx = &nmp->nm_rxlock; 2122 int slpflag; 2123 int slptimeo; 2124 int error; 2125 2126 /* 2127 * Unconditionally check for completion in case another nfsiod 2128 * get the packet while the caller was blocked, before the caller 2129 * called us. Packet reception is handled by mainline code which 2130 * is protected by the BGL at the moment. 2131 * 2132 * We do not strictly need the second check just before the 2133 * tsleep(), but it's good defensive programming. 2134 */ 2135 if (rep && rep->r_mrep != NULL) 2136 return (EALREADY); 2137 2138 if (nmp->nm_flag & NFSMNT_INT) 2139 slpflag = PCATCH; 2140 else 2141 slpflag = 0; 2142 slptimeo = 0; 2143 2144 while ((error = mtx_lock_ex_try(mtx)) != 0) { 2145 if (nfs_sigintr(nmp, rep, (rep ? rep->r_td : NULL))) { 2146 error = EINTR; 2147 break; 2148 } 2149 if (rep && rep->r_mrep != NULL) { 2150 error = EALREADY; 2151 break; 2152 } 2153 2154 /* 2155 * NOTE: can return ENOLCK, but in that case rep->r_mrep 2156 * will already be set. 2157 */ 2158 if (rep) { 2159 error = mtx_lock_ex_link(mtx, &rep->r_link, 2160 "nfsrcvlk", 2161 slpflag, slptimeo); 2162 } else { 2163 error = mtx_lock_ex(mtx, "nfsrcvlk", slpflag, slptimeo); 2164 } 2165 if (error == 0) 2166 break; 2167 2168 /* 2169 * If our reply was recieved while we were sleeping, 2170 * then just return without taking the lock to avoid a 2171 * situation where a single iod could 'capture' the 2172 * recieve lock. 2173 */ 2174 if (rep && rep->r_mrep != NULL) { 2175 error = EALREADY; 2176 break; 2177 } 2178 if (slpflag == PCATCH) { 2179 slpflag = 0; 2180 slptimeo = 2 * hz; 2181 } 2182 } 2183 if (error == 0) { 2184 if (rep && rep->r_mrep != NULL) { 2185 error = EALREADY; 2186 mtx_unlock(mtx); 2187 } 2188 } 2189 return (error); 2190 } 2191 2192 /* 2193 * Unlock the stream socket for others. 2194 */ 2195 static void 2196 nfs_rcvunlock(struct nfsmount *nmp) 2197 { 2198 mtx_unlock(&nmp->nm_rxlock); 2199 } 2200 2201 /* 2202 * nfs_realign: 2203 * 2204 * Check for badly aligned mbuf data and realign by copying the unaligned 2205 * portion of the data into a new mbuf chain and freeing the portions 2206 * of the old chain that were replaced. 2207 * 2208 * We cannot simply realign the data within the existing mbuf chain 2209 * because the underlying buffers may contain other rpc commands and 2210 * we cannot afford to overwrite them. 2211 * 2212 * We would prefer to avoid this situation entirely. The situation does 2213 * not occur with NFS/UDP and is supposed to only occassionally occur 2214 * with TCP. Use vfs.nfs.realign_count and realign_test to check this. 2215 * 2216 * NOTE! MB_DONTWAIT cannot be used here. The mbufs must be acquired 2217 * because the rpc request OR reply cannot be thrown away. TCP NFS 2218 * mounts do not retry their RPCs unless the TCP connection itself 2219 * is dropped so throwing away a RPC will basically cause the NFS 2220 * operation to lockup indefinitely. 2221 */ 2222 static void 2223 nfs_realign(struct mbuf **pm, int hsiz) 2224 { 2225 struct mbuf *m; 2226 struct mbuf *n = NULL; 2227 2228 /* 2229 * Check for misalignemnt 2230 */ 2231 ++nfs_realign_test; 2232 while ((m = *pm) != NULL) { 2233 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) 2234 break; 2235 pm = &m->m_next; 2236 } 2237 2238 /* 2239 * If misalignment found make a completely new copy. 2240 */ 2241 if (m) { 2242 ++nfs_realign_count; 2243 n = m_dup_data(m, MB_WAIT); 2244 m_freem(*pm); 2245 *pm = n; 2246 } 2247 } 2248 2249 #ifndef NFS_NOSERVER 2250 2251 /* 2252 * Parse an RPC request 2253 * - verify it 2254 * - fill in the cred struct. 2255 */ 2256 int 2257 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 2258 { 2259 int len, i; 2260 u_int32_t *tl; 2261 struct uio uio; 2262 struct iovec iov; 2263 caddr_t cp; 2264 u_int32_t nfsvers, auth_type; 2265 uid_t nickuid; 2266 int error = 0, ticklen; 2267 struct nfsuid *nuidp; 2268 struct timeval tvin, tvout; 2269 struct nfsm_info info; 2270 #if 0 /* until encrypted keys are implemented */ 2271 NFSKERBKEYSCHED_T keys; /* stores key schedule */ 2272 #endif 2273 2274 info.mrep = nd->nd_mrep; 2275 info.md = nd->nd_md; 2276 info.dpos = nd->nd_dpos; 2277 2278 if (has_header) { 2279 NULLOUT(tl = nfsm_dissect(&info, 10 * NFSX_UNSIGNED)); 2280 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 2281 if (*tl++ != rpc_call) { 2282 m_freem(info.mrep); 2283 return (EBADRPC); 2284 } 2285 } else { 2286 NULLOUT(tl = nfsm_dissect(&info, 8 * NFSX_UNSIGNED)); 2287 } 2288 nd->nd_repstat = 0; 2289 nd->nd_flag = 0; 2290 if (*tl++ != rpc_vers) { 2291 nd->nd_repstat = ERPCMISMATCH; 2292 nd->nd_procnum = NFSPROC_NOOP; 2293 return (0); 2294 } 2295 if (*tl != nfs_prog) { 2296 nd->nd_repstat = EPROGUNAVAIL; 2297 nd->nd_procnum = NFSPROC_NOOP; 2298 return (0); 2299 } 2300 tl++; 2301 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 2302 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 2303 nd->nd_repstat = EPROGMISMATCH; 2304 nd->nd_procnum = NFSPROC_NOOP; 2305 return (0); 2306 } 2307 if (nfsvers == NFS_VER3) 2308 nd->nd_flag = ND_NFSV3; 2309 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 2310 if (nd->nd_procnum == NFSPROC_NULL) 2311 return (0); 2312 if (nd->nd_procnum >= NFS_NPROCS || 2313 (nd->nd_procnum >= NQNFSPROC_GETLEASE) || 2314 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 2315 nd->nd_repstat = EPROCUNAVAIL; 2316 nd->nd_procnum = NFSPROC_NOOP; 2317 return (0); 2318 } 2319 if ((nd->nd_flag & ND_NFSV3) == 0) 2320 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 2321 auth_type = *tl++; 2322 len = fxdr_unsigned(int, *tl++); 2323 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2324 m_freem(info.mrep); 2325 return (EBADRPC); 2326 } 2327 2328 nd->nd_flag &= ~ND_KERBAUTH; 2329 /* 2330 * Handle auth_unix or auth_kerb. 2331 */ 2332 if (auth_type == rpc_auth_unix) { 2333 len = fxdr_unsigned(int, *++tl); 2334 if (len < 0 || len > NFS_MAXNAMLEN) { 2335 m_freem(info.mrep); 2336 return (EBADRPC); 2337 } 2338 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2339 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2340 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 2341 nd->nd_cr.cr_ref = 1; 2342 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 2343 nd->nd_cr.cr_ruid = nd->nd_cr.cr_svuid = nd->nd_cr.cr_uid; 2344 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 2345 nd->nd_cr.cr_rgid = nd->nd_cr.cr_svgid = nd->nd_cr.cr_gid; 2346 len = fxdr_unsigned(int, *tl); 2347 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2348 m_freem(info.mrep); 2349 return (EBADRPC); 2350 } 2351 NULLOUT(tl = nfsm_dissect(&info, (len + 2) * NFSX_UNSIGNED)); 2352 for (i = 1; i <= len; i++) 2353 if (i < NGROUPS) 2354 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 2355 else 2356 tl++; 2357 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 2358 if (nd->nd_cr.cr_ngroups > 1) 2359 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 2360 len = fxdr_unsigned(int, *++tl); 2361 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2362 m_freem(info.mrep); 2363 return (EBADRPC); 2364 } 2365 if (len > 0) { 2366 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2367 } 2368 } else if (auth_type == rpc_auth_kerb) { 2369 switch (fxdr_unsigned(int, *tl++)) { 2370 case RPCAKN_FULLNAME: 2371 ticklen = fxdr_unsigned(int, *tl); 2372 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2373 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2374 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2375 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2376 m_freem(info.mrep); 2377 return (EBADRPC); 2378 } 2379 uio.uio_offset = 0; 2380 uio.uio_iov = &iov; 2381 uio.uio_iovcnt = 1; 2382 uio.uio_segflg = UIO_SYSSPACE; 2383 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 2384 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2385 ERROROUT(nfsm_mtouio(&info, &uio, uio.uio_resid)); 2386 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2387 if (*tl++ != rpc_auth_kerb || 2388 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2389 kprintf("Bad kerb verifier\n"); 2390 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2391 nd->nd_procnum = NFSPROC_NOOP; 2392 return (0); 2393 } 2394 NULLOUT(cp = nfsm_dissect(&info, 4 * NFSX_UNSIGNED)); 2395 tl = (u_int32_t *)cp; 2396 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2397 kprintf("Not fullname kerb verifier\n"); 2398 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2399 nd->nd_procnum = NFSPROC_NOOP; 2400 return (0); 2401 } 2402 cp += NFSX_UNSIGNED; 2403 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 2404 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2405 nd->nd_flag |= ND_KERBFULL; 2406 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2407 break; 2408 case RPCAKN_NICKNAME: 2409 if (len != 2 * NFSX_UNSIGNED) { 2410 kprintf("Kerb nickname short\n"); 2411 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2412 nd->nd_procnum = NFSPROC_NOOP; 2413 return (0); 2414 } 2415 nickuid = fxdr_unsigned(uid_t, *tl); 2416 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2417 if (*tl++ != rpc_auth_kerb || 2418 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2419 kprintf("Kerb nick verifier bad\n"); 2420 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2421 nd->nd_procnum = NFSPROC_NOOP; 2422 return (0); 2423 } 2424 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2425 tvin.tv_sec = *tl++; 2426 tvin.tv_usec = *tl; 2427 2428 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 2429 nuidp != NULL; nuidp = nuidp->nu_hash.le_next) { 2430 if (nuidp->nu_cr.cr_uid == nickuid && 2431 (!nd->nd_nam2 || 2432 netaddr_match(NU_NETFAM(nuidp), 2433 &nuidp->nu_haddr, nd->nd_nam2))) 2434 break; 2435 } 2436 if (!nuidp) { 2437 nd->nd_repstat = 2438 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2439 nd->nd_procnum = NFSPROC_NOOP; 2440 return (0); 2441 } 2442 2443 /* 2444 * Now, decrypt the timestamp using the session key 2445 * and validate it. 2446 */ 2447 #ifdef NFSKERB 2448 XXX 2449 #else 2450 tvout.tv_sec = 0; 2451 tvout.tv_usec = 0; 2452 #endif 2453 2454 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2455 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2456 if (nuidp->nu_expire != time_uptime || 2457 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2458 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2459 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2460 nuidp->nu_expire = 0; 2461 nd->nd_repstat = 2462 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2463 nd->nd_procnum = NFSPROC_NOOP; 2464 return (0); 2465 } 2466 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 2467 nd->nd_flag |= ND_KERBNICK; 2468 break; 2469 } 2470 } else { 2471 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2472 nd->nd_procnum = NFSPROC_NOOP; 2473 return (0); 2474 } 2475 2476 nd->nd_md = info.md; 2477 nd->nd_dpos = info.dpos; 2478 return (0); 2479 nfsmout: 2480 return (error); 2481 } 2482 2483 #endif 2484 2485 /* 2486 * Send a message to the originating process's terminal. The thread and/or 2487 * process may be NULL. YYY the thread should not be NULL but there may 2488 * still be some uio_td's that are still being passed as NULL through to 2489 * nfsm_request(). 2490 */ 2491 static int 2492 nfs_msg(struct thread *td, char *server, char *msg) 2493 { 2494 tpr_t tpr; 2495 2496 if (td && td->td_proc) 2497 tpr = tprintf_open(td->td_proc); 2498 else 2499 tpr = NULL; 2500 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2501 tprintf_close(tpr); 2502 return (0); 2503 } 2504 2505 #ifndef NFS_NOSERVER 2506 2507 /* 2508 * Socket upcall routine for nfsd sockets. This runs in the protocol 2509 * thread and passes waitflag == MB_DONTWAIT. 2510 */ 2511 void 2512 nfsrv_rcv_upcall(struct socket *so, void *arg, int waitflag) 2513 { 2514 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2515 2516 if (slp->ns_needq_upcall == 0) { 2517 slp->ns_needq_upcall = 1; /* ok to race */ 2518 lwkt_gettoken(&nfs_token); 2519 nfsrv_wakenfsd(slp, 1); 2520 lwkt_reltoken(&nfs_token); 2521 } 2522 #if 0 2523 lwkt_gettoken(&slp->ns_token); 2524 slp->ns_flag |= SLP_NEEDQ; 2525 nfsrv_rcv(so, arg, waitflag); 2526 lwkt_reltoken(&slp->ns_token); 2527 #endif 2528 } 2529 2530 /* 2531 * Process new data on a receive socket. Essentially do as much as we can 2532 * non-blocking, else punt and it will be called with MB_WAIT from an nfsd. 2533 * 2534 * slp->ns_token is held on call 2535 */ 2536 void 2537 nfsrv_rcv(struct socket *so, void *arg, int waitflag) 2538 { 2539 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2540 struct mbuf *m; 2541 struct sockaddr *nam; 2542 struct sockbuf sio; 2543 int flags, error; 2544 int nparallel_wakeup = 0; 2545 2546 ASSERT_LWKT_TOKEN_HELD(&slp->ns_token); 2547 2548 if ((slp->ns_flag & SLP_VALID) == 0) 2549 return; 2550 2551 /* 2552 * Do not allow an infinite number of completed RPC records to build 2553 * up before we stop reading data from the socket. Otherwise we could 2554 * end up holding onto an unreasonable number of mbufs for requests 2555 * waiting for service. 2556 * 2557 * This should give pretty good feedback to the TCP layer and 2558 * prevents a memory crunch for other protocols. 2559 * 2560 * Note that the same service socket can be dispatched to several 2561 * nfs servers simultaniously. The tcp protocol callback calls us 2562 * with MB_DONTWAIT. nfsd calls us with MB_WAIT (typically). 2563 */ 2564 if (NFSRV_RECLIMIT(slp)) 2565 return; 2566 2567 /* 2568 * Handle protocol specifics to parse an RPC request. We always 2569 * pull from the socket using non-blocking I/O. 2570 */ 2571 if (so->so_type == SOCK_STREAM) { 2572 /* 2573 * The data has to be read in an orderly fashion from a TCP 2574 * stream, unlike a UDP socket. It is possible for soreceive 2575 * and/or nfsrv_getstream() to block, so make sure only one 2576 * entity is messing around with the TCP stream at any given 2577 * moment. The receive sockbuf's lock in soreceive is not 2578 * sufficient. 2579 */ 2580 if (slp->ns_flag & SLP_GETSTREAM) 2581 return; 2582 slp->ns_flag |= SLP_GETSTREAM; 2583 2584 /* 2585 * Do soreceive(). Pull out as much data as possible without 2586 * blocking. 2587 */ 2588 sbinit(&sio, 1000000000); 2589 flags = MSG_DONTWAIT; 2590 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags); 2591 if (error || sio.sb_mb == NULL) { 2592 if (error != EWOULDBLOCK) 2593 slp->ns_flag |= SLP_DISCONN; 2594 slp->ns_flag &= ~(SLP_GETSTREAM | SLP_NEEDQ); 2595 goto done; 2596 } 2597 m = sio.sb_mb; 2598 if (slp->ns_rawend) { 2599 slp->ns_rawend->m_next = m; 2600 slp->ns_cc += sio.sb_cc; 2601 } else { 2602 slp->ns_raw = m; 2603 slp->ns_cc = sio.sb_cc; 2604 } 2605 while (m->m_next) 2606 m = m->m_next; 2607 slp->ns_rawend = m; 2608 2609 /* 2610 * Now try and parse as many record(s) as we can out of the 2611 * raw stream data. This will set SLP_DOREC. 2612 */ 2613 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup); 2614 if (error && error != EWOULDBLOCK) 2615 slp->ns_flag |= SLP_DISCONN; 2616 slp->ns_flag &= ~SLP_GETSTREAM; 2617 } else { 2618 /* 2619 * For UDP soreceive typically pulls just one packet, loop 2620 * to get the whole batch. 2621 */ 2622 do { 2623 sbinit(&sio, 1000000000); 2624 flags = MSG_DONTWAIT; 2625 error = so_pru_soreceive(so, &nam, NULL, &sio, 2626 NULL, &flags); 2627 if (sio.sb_mb) { 2628 struct nfsrv_rec *rec; 2629 int mf = (waitflag & MB_DONTWAIT) ? 2630 M_NOWAIT : M_WAITOK; 2631 rec = kmalloc(sizeof(struct nfsrv_rec), 2632 M_NFSRVDESC, mf); 2633 if (!rec) { 2634 if (nam) 2635 kfree(nam, M_SONAME); 2636 m_freem(sio.sb_mb); 2637 continue; 2638 } 2639 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED); 2640 rec->nr_address = nam; 2641 rec->nr_packet = sio.sb_mb; 2642 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2643 ++slp->ns_numrec; 2644 slp->ns_flag |= SLP_DOREC; 2645 ++nparallel_wakeup; 2646 } else { 2647 slp->ns_flag &= ~SLP_NEEDQ; 2648 } 2649 if (error) { 2650 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2651 && error != EWOULDBLOCK) { 2652 slp->ns_flag |= SLP_DISCONN; 2653 break; 2654 } 2655 } 2656 if (NFSRV_RECLIMIT(slp)) 2657 break; 2658 } while (sio.sb_mb); 2659 } 2660 2661 /* 2662 * If we were upcalled from the tcp protocol layer and we have 2663 * fully parsed records ready to go, or there is new data pending, 2664 * or something went wrong, try to wake up a nfsd thread to deal 2665 * with it. 2666 */ 2667 done: 2668 /* XXX this code is currently not executed (nfsrv_rcv_upcall) */ 2669 if (waitflag == MB_DONTWAIT && (slp->ns_flag & SLP_ACTION_MASK)) { 2670 lwkt_gettoken(&nfs_token); 2671 nfsrv_wakenfsd(slp, nparallel_wakeup); 2672 lwkt_reltoken(&nfs_token); 2673 } 2674 } 2675 2676 /* 2677 * Try and extract an RPC request from the mbuf data list received on a 2678 * stream socket. The "waitflag" argument indicates whether or not it 2679 * can sleep. 2680 */ 2681 static int 2682 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp) 2683 { 2684 struct mbuf *m, **mpp; 2685 char *cp1, *cp2; 2686 int len; 2687 struct mbuf *om, *m2, *recm; 2688 u_int32_t recmark; 2689 2690 for (;;) { 2691 if (slp->ns_reclen == 0) { 2692 if (slp->ns_cc < NFSX_UNSIGNED) 2693 return (0); 2694 m = slp->ns_raw; 2695 if (m->m_len >= NFSX_UNSIGNED) { 2696 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 2697 m->m_data += NFSX_UNSIGNED; 2698 m->m_len -= NFSX_UNSIGNED; 2699 } else { 2700 cp1 = (caddr_t)&recmark; 2701 cp2 = mtod(m, caddr_t); 2702 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2703 while (m->m_len == 0) { 2704 m = m->m_next; 2705 cp2 = mtod(m, caddr_t); 2706 } 2707 *cp1++ = *cp2++; 2708 m->m_data++; 2709 m->m_len--; 2710 } 2711 } 2712 slp->ns_cc -= NFSX_UNSIGNED; 2713 recmark = ntohl(recmark); 2714 slp->ns_reclen = recmark & ~0x80000000; 2715 if (recmark & 0x80000000) 2716 slp->ns_flag |= SLP_LASTFRAG; 2717 else 2718 slp->ns_flag &= ~SLP_LASTFRAG; 2719 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) { 2720 log(LOG_ERR, "%s (%d) from nfs client\n", 2721 "impossible packet length", 2722 slp->ns_reclen); 2723 return (EPERM); 2724 } 2725 } 2726 2727 /* 2728 * Now get the record part. 2729 * 2730 * Note that slp->ns_reclen may be 0. Linux sometimes 2731 * generates 0-length RPCs 2732 */ 2733 recm = NULL; 2734 if (slp->ns_cc == slp->ns_reclen) { 2735 recm = slp->ns_raw; 2736 slp->ns_raw = slp->ns_rawend = NULL; 2737 slp->ns_cc = slp->ns_reclen = 0; 2738 } else if (slp->ns_cc > slp->ns_reclen) { 2739 len = 0; 2740 m = slp->ns_raw; 2741 om = NULL; 2742 2743 while (len < slp->ns_reclen) { 2744 if ((len + m->m_len) > slp->ns_reclen) { 2745 m2 = m_copym(m, 0, slp->ns_reclen - len, 2746 waitflag); 2747 if (m2) { 2748 if (om) { 2749 om->m_next = m2; 2750 recm = slp->ns_raw; 2751 } else 2752 recm = m2; 2753 m->m_data += slp->ns_reclen - len; 2754 m->m_len -= slp->ns_reclen - len; 2755 len = slp->ns_reclen; 2756 } else { 2757 return (EWOULDBLOCK); 2758 } 2759 } else if ((len + m->m_len) == slp->ns_reclen) { 2760 om = m; 2761 len += m->m_len; 2762 m = m->m_next; 2763 recm = slp->ns_raw; 2764 om->m_next = NULL; 2765 } else { 2766 om = m; 2767 len += m->m_len; 2768 m = m->m_next; 2769 } 2770 } 2771 slp->ns_raw = m; 2772 slp->ns_cc -= len; 2773 slp->ns_reclen = 0; 2774 } else { 2775 return (0); 2776 } 2777 2778 /* 2779 * Accumulate the fragments into a record. 2780 */ 2781 mpp = &slp->ns_frag; 2782 while (*mpp) 2783 mpp = &((*mpp)->m_next); 2784 *mpp = recm; 2785 if (slp->ns_flag & SLP_LASTFRAG) { 2786 struct nfsrv_rec *rec; 2787 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK; 2788 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf); 2789 if (!rec) { 2790 m_freem(slp->ns_frag); 2791 } else { 2792 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); 2793 rec->nr_address = NULL; 2794 rec->nr_packet = slp->ns_frag; 2795 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2796 ++slp->ns_numrec; 2797 slp->ns_flag |= SLP_DOREC; 2798 ++*countp; 2799 } 2800 slp->ns_frag = NULL; 2801 } 2802 } 2803 } 2804 2805 #ifdef INVARIANTS 2806 2807 /* 2808 * Sanity check our mbuf chain. 2809 */ 2810 static void 2811 nfs_checkpkt(struct mbuf *m, int len) 2812 { 2813 int xlen = 0; 2814 while (m) { 2815 xlen += m->m_len; 2816 m = m->m_next; 2817 } 2818 if (xlen != len) { 2819 panic("nfs_checkpkt: len mismatch %d/%d mbuf %p", 2820 xlen, len, m); 2821 } 2822 } 2823 2824 #else 2825 2826 static void 2827 nfs_checkpkt(struct mbuf *m __unused, int len __unused) 2828 { 2829 } 2830 2831 #endif 2832 2833 /* 2834 * Parse an RPC header. 2835 * 2836 * If the socket is invalid or no records are pending we return ENOBUFS. 2837 * The caller must deal with NEEDQ races. 2838 */ 2839 int 2840 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, 2841 struct nfsrv_descript **ndp) 2842 { 2843 struct nfsrv_rec *rec; 2844 struct mbuf *m; 2845 struct sockaddr *nam; 2846 struct nfsrv_descript *nd; 2847 int error; 2848 2849 *ndp = NULL; 2850 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) 2851 return (ENOBUFS); 2852 rec = STAILQ_FIRST(&slp->ns_rec); 2853 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 2854 KKASSERT(slp->ns_numrec > 0); 2855 if (--slp->ns_numrec == 0) 2856 slp->ns_flag &= ~SLP_DOREC; 2857 nam = rec->nr_address; 2858 m = rec->nr_packet; 2859 kfree(rec, M_NFSRVDESC); 2860 nd = kmalloc(sizeof(struct nfsrv_descript), M_NFSRVDESC, M_WAITOK); 2861 nd->nd_md = nd->nd_mrep = m; 2862 nd->nd_nam2 = nam; 2863 nd->nd_dpos = mtod(m, caddr_t); 2864 error = nfs_getreq(nd, nfsd, TRUE); 2865 if (error) { 2866 if (nam) { 2867 kfree(nam, M_SONAME); 2868 } 2869 kfree((caddr_t)nd, M_NFSRVDESC); 2870 return (error); 2871 } 2872 *ndp = nd; 2873 nfsd->nfsd_nd = nd; 2874 return (0); 2875 } 2876 2877 /* 2878 * Try to assign service sockets to nfsd threads based on the number 2879 * of new rpc requests that have been queued on the service socket. 2880 * 2881 * If no nfsd's are available or additonal requests are pending, set the 2882 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for 2883 * the work in the nfssvc_sock list when it is finished processing its 2884 * current work. This flag is only cleared when an nfsd can not find 2885 * any new work to perform. 2886 */ 2887 void 2888 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel) 2889 { 2890 struct nfsd *nd; 2891 2892 if ((slp->ns_flag & SLP_VALID) == 0) 2893 return; 2894 if (nparallel <= 1) 2895 nparallel = 1; 2896 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) { 2897 if (nd->nfsd_flag & NFSD_WAITING) { 2898 nd->nfsd_flag &= ~NFSD_WAITING; 2899 if (nd->nfsd_slp) 2900 panic("nfsd wakeup"); 2901 nfsrv_slpref(slp); 2902 nd->nfsd_slp = slp; 2903 wakeup((caddr_t)nd); 2904 if (--nparallel == 0) 2905 break; 2906 } 2907 } 2908 2909 /* 2910 * If we couldn't assign slp then the NFSDs are all busy and 2911 * we set a flag indicating that there is pending work. 2912 */ 2913 if (nparallel) 2914 nfsd_head_flag |= NFSD_CHECKSLP; 2915 } 2916 #endif /* NFS_NOSERVER */ 2917