1 /* 2 * Copyright (c) 1989, 1991, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 37 * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.45 2007/05/18 17:05:13 dillon Exp $ 39 */ 40 41 /* 42 * Socket operations for use by nfs 43 */ 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/kernel.h> 51 #include <sys/mbuf.h> 52 #include <sys/vnode.h> 53 #include <sys/fcntl.h> 54 #include <sys/protosw.h> 55 #include <sys/resourcevar.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/socketops.h> 59 #include <sys/syslog.h> 60 #include <sys/thread.h> 61 #include <sys/tprintf.h> 62 #include <sys/sysctl.h> 63 #include <sys/signalvar.h> 64 65 #include <sys/signal2.h> 66 #include <sys/mutex2.h> 67 #include <sys/socketvar2.h> 68 69 #include <netinet/in.h> 70 #include <netinet/tcp.h> 71 #include <sys/thread2.h> 72 73 #include "rpcv2.h" 74 #include "nfsproto.h" 75 #include "nfs.h" 76 #include "xdr_subs.h" 77 #include "nfsm_subs.h" 78 #include "nfsmount.h" 79 #include "nfsnode.h" 80 #include "nfsrtt.h" 81 82 #define TRUE 1 83 #define FALSE 0 84 85 /* 86 * RTT calculations are scaled by 256 (8 bits). A proper fractional 87 * RTT will still be calculated even with a slow NFS timer. 88 */ 89 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum]] 90 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum]] 91 #define NFS_RTT_SCALE_BITS 8 /* bits */ 92 #define NFS_RTT_SCALE 256 /* value */ 93 94 /* 95 * Defines which timer to use for the procnum. 96 * 0 - default 97 * 1 - getattr 98 * 2 - lookup 99 * 3 - read 100 * 4 - write 101 */ 102 static int proct[NFS_NPROCS] = { 103 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, /* 00-09 */ 104 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, /* 10-19 */ 105 0, 5, 0, 0, 0, 0, /* 20-29 */ 106 }; 107 108 static int multt[NFS_NPROCS] = { 109 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00-09 */ 110 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10-19 */ 111 1, 2, 1, 1, 1, 1, /* 20-29 */ 112 }; 113 114 static int nfs_backoff[8] = { 2, 3, 5, 8, 13, 21, 34, 55 }; 115 static int nfs_realign_test; 116 static int nfs_realign_count; 117 static int nfs_showrtt; 118 static int nfs_showrexmit; 119 int nfs_maxasyncbio = NFS_MAXASYNCBIO; 120 121 SYSCTL_DECL(_vfs_nfs); 122 123 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, ""); 124 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, ""); 125 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrtt, CTLFLAG_RW, &nfs_showrtt, 0, ""); 126 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrexmit, CTLFLAG_RW, &nfs_showrexmit, 0, ""); 127 SYSCTL_INT(_vfs_nfs, OID_AUTO, maxasyncbio, CTLFLAG_RW, &nfs_maxasyncbio, 0, ""); 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); 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 error = EPIPE; 633 } 634 if (error) 635 goto errout; 636 len = ntohl(len) & ~0x80000000; 637 /* 638 * This is SERIOUS! We are out of sync with the sender 639 * and forcing a disconnect/reconnect is all I can do. 640 */ 641 if (len > NFS_MAXPACKET) { 642 log(LOG_ERR, "%s (%d) from nfs server %s\n", 643 "impossible packet length", 644 len, 645 nmp->nm_mountp->mnt_stat.f_mntfromname); 646 error = EFBIG; 647 goto errout; 648 } 649 650 /* 651 * Get the rest of the packet as an mbuf chain 652 */ 653 sbinit(&sio, len); 654 do { 655 rcvflg = MSG_WAITALL; 656 error = so_pru_soreceive(so, NULL, NULL, &sio, 657 NULL, &rcvflg); 658 } while (error == EWOULDBLOCK || error == EINTR || 659 error == ERESTART); 660 if (error == 0 && sio.sb_cc != len) { 661 if (sio.sb_cc != 0) 662 log(LOG_INFO, 663 "short receive (%zu/%d) from nfs server %s\n", 664 (size_t)len - auio.uio_resid, len, 665 nmp->nm_mountp->mnt_stat.f_mntfromname); 666 error = EPIPE; 667 } 668 *mp = sio.sb_mb; 669 } else { 670 /* 671 * Non-stream, so get the whole packet by not 672 * specifying MSG_WAITALL and by specifying a large 673 * length. 674 * 675 * We have no use for control msg., but must grab them 676 * and then throw them away so we know what is going 677 * on. 678 */ 679 sbinit(&sio, 100000000); 680 do { 681 rcvflg = 0; 682 error = so_pru_soreceive(so, NULL, NULL, &sio, 683 &control, &rcvflg); 684 if (control) 685 m_freem(control); 686 if (error == EWOULDBLOCK && rep) { 687 if (rep->r_flags & R_SOFTTERM) { 688 m_freem(sio.sb_mb); 689 return (EINTR); 690 } 691 } 692 } while (error == EWOULDBLOCK || 693 (error == 0 && sio.sb_mb == NULL && control)); 694 if ((rcvflg & MSG_EOR) == 0) 695 kprintf("Egad!!\n"); 696 if (error == 0 && sio.sb_mb == NULL) 697 error = EPIPE; 698 len = sio.sb_cc; 699 *mp = sio.sb_mb; 700 } 701 errout: 702 if (error && error != EINTR && error != ERESTART) { 703 m_freem(*mp); 704 *mp = NULL; 705 if (error != EPIPE) { 706 log(LOG_INFO, 707 "receive error %d from nfs server %s\n", 708 error, 709 nmp->nm_mountp->mnt_stat.f_mntfromname); 710 } 711 error = nfs_sndlock(nmp, rep); 712 if (!error) { 713 error = nfs_reconnect(nmp, rep); 714 if (!error) 715 goto tryagain; 716 else 717 nfs_sndunlock(nmp); 718 } 719 } 720 } else { 721 if ((so = nmp->nm_so) == NULL) 722 return (EACCES); 723 if (so->so_state & SS_ISCONNECTED) 724 getnam = NULL; 725 else 726 getnam = aname; 727 sbinit(&sio, 100000000); 728 do { 729 rcvflg = 0; 730 error = so_pru_soreceive(so, getnam, NULL, &sio, 731 NULL, &rcvflg); 732 if (error == EWOULDBLOCK && rep && 733 (rep->r_flags & R_SOFTTERM)) { 734 m_freem(sio.sb_mb); 735 return (EINTR); 736 } 737 } while (error == EWOULDBLOCK); 738 739 len = sio.sb_cc; 740 *mp = sio.sb_mb; 741 742 /* 743 * A shutdown may result in no error and no mbuf. 744 * Convert to EPIPE. 745 */ 746 if (*mp == NULL && error == 0) 747 error = EPIPE; 748 } 749 if (error) { 750 m_freem(*mp); 751 *mp = NULL; 752 } 753 754 /* 755 * Search for any mbufs that are not a multiple of 4 bytes long 756 * or with m_data not longword aligned. 757 * These could cause pointer alignment problems, so copy them to 758 * well aligned mbufs. 759 */ 760 nfs_realign(mp, 5 * NFSX_UNSIGNED); 761 return (error); 762 } 763 764 /* 765 * Implement receipt of reply on a socket. 766 * 767 * We must search through the list of received datagrams matching them 768 * with outstanding requests using the xid, until ours is found. 769 * 770 * If myrep is NULL we process packets on the socket until 771 * interrupted or until nm_reqrxq is non-empty. 772 */ 773 /* ARGSUSED */ 774 int 775 nfs_reply(struct nfsmount *nmp, struct nfsreq *myrep) 776 { 777 struct nfsreq *rep; 778 struct sockaddr *nam; 779 u_int32_t rxid; 780 u_int32_t *tl; 781 int error; 782 struct nfsm_info info; 783 784 /* 785 * Loop around until we get our own reply 786 */ 787 for (;;) { 788 /* 789 * Lock against other receivers so that I don't get stuck in 790 * sbwait() after someone else has received my reply for me. 791 * Also necessary for connection based protocols to avoid 792 * race conditions during a reconnect. 793 * 794 * If nfs_rcvlock() returns EALREADY, that means that 795 * the reply has already been recieved by another 796 * process and we can return immediately. In this 797 * case, the lock is not taken to avoid races with 798 * other processes. 799 */ 800 info.mrep = NULL; 801 802 error = nfs_rcvlock(nmp, myrep); 803 if (error == EALREADY) 804 return (0); 805 if (error) 806 return (error); 807 808 /* 809 * If myrep is NULL we are the receiver helper thread. 810 * Stop waiting for incoming replies if there are 811 * messages sitting on reqrxq that we need to process, 812 * or if a shutdown request is pending. 813 */ 814 if (myrep == NULL && (TAILQ_FIRST(&nmp->nm_reqrxq) || 815 nmp->nm_rxstate > NFSSVC_PENDING)) { 816 nfs_rcvunlock(nmp); 817 return(EWOULDBLOCK); 818 } 819 820 /* 821 * Get the next Rpc reply off the socket 822 * 823 * We cannot release the receive lock until we've 824 * filled in rep->r_mrep, otherwise a waiting 825 * thread may deadlock in soreceive with no incoming 826 * packets expected. 827 */ 828 error = nfs_receive(nmp, myrep, &nam, &info.mrep); 829 if (error) { 830 /* 831 * Ignore routing errors on connectionless protocols?? 832 */ 833 nfs_rcvunlock(nmp); 834 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 835 if (nmp->nm_so == NULL) 836 return (error); 837 nmp->nm_so->so_error = 0; 838 continue; 839 } 840 return (error); 841 } 842 if (nam) 843 FREE(nam, M_SONAME); 844 845 /* 846 * Get the xid and check that it is an rpc reply 847 */ 848 info.md = info.mrep; 849 info.dpos = mtod(info.md, caddr_t); 850 NULLOUT(tl = nfsm_dissect(&info, 2*NFSX_UNSIGNED)); 851 rxid = *tl++; 852 if (*tl != rpc_reply) { 853 nfsstats.rpcinvalid++; 854 m_freem(info.mrep); 855 info.mrep = NULL; 856 nfsmout: 857 nfs_rcvunlock(nmp); 858 continue; 859 } 860 861 /* 862 * Loop through the request list to match up the reply 863 * Iff no match, just drop the datagram. On match, set 864 * r_mrep atomically to prevent the timer from messing 865 * around with the request after we have exited the critical 866 * section. 867 */ 868 crit_enter(); 869 TAILQ_FOREACH(rep, &nmp->nm_reqq, r_chain) { 870 if (rep->r_mrep == NULL && rxid == rep->r_xid) 871 break; 872 } 873 874 /* 875 * Fill in the rest of the reply if we found a match. 876 * 877 * Deal with duplicate responses if there was no match. 878 */ 879 if (rep) { 880 rep->r_md = info.md; 881 rep->r_dpos = info.dpos; 882 if (nfsrtton) { 883 struct rttl *rt; 884 885 rt = &nfsrtt.rttl[nfsrtt.pos]; 886 rt->proc = rep->r_procnum; 887 rt->rto = 0; 888 rt->sent = 0; 889 rt->cwnd = nmp->nm_maxasync_scaled; 890 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 891 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 892 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 893 getmicrotime(&rt->tstamp); 894 if (rep->r_flags & R_TIMING) 895 rt->rtt = rep->r_rtt; 896 else 897 rt->rtt = 1000000; 898 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 899 } 900 901 /* 902 * New congestion control is based only on async 903 * requests. 904 */ 905 if (nmp->nm_maxasync_scaled < NFS_MAXASYNC_SCALED) 906 ++nmp->nm_maxasync_scaled; 907 if (rep->r_flags & R_SENT) { 908 rep->r_flags &= ~R_SENT; 909 } 910 /* 911 * Update rtt using a gain of 0.125 on the mean 912 * and a gain of 0.25 on the deviation. 913 * 914 * NOTE SRTT/SDRTT are only good if R_TIMING is set. 915 */ 916 if ((rep->r_flags & R_TIMING) && rep->r_rexmit == 0) { 917 /* 918 * Since the timer resolution of 919 * NFS_HZ is so course, it can often 920 * result in r_rtt == 0. Since 921 * r_rtt == N means that the actual 922 * rtt is between N+dt and N+2-dt ticks, 923 * add 1. 924 */ 925 int n; 926 int d; 927 928 #define NFSRSB NFS_RTT_SCALE_BITS 929 n = ((NFS_SRTT(rep) * 7) + 930 (rep->r_rtt << NFSRSB)) >> 3; 931 d = n - NFS_SRTT(rep); 932 NFS_SRTT(rep) = n; 933 934 /* 935 * Don't let the jitter calculation decay 936 * too quickly, but we want a fast rampup. 937 */ 938 if (d < 0) 939 d = -d; 940 d <<= NFSRSB; 941 if (d < NFS_SDRTT(rep)) 942 n = ((NFS_SDRTT(rep) * 15) + d) >> 4; 943 else 944 n = ((NFS_SDRTT(rep) * 3) + d) >> 2; 945 NFS_SDRTT(rep) = n; 946 #undef NFSRSB 947 } 948 nmp->nm_timeouts = 0; 949 rep->r_mrep = info.mrep; 950 nfs_hardterm(rep, 0); 951 } else { 952 /* 953 * Extract vers, prog, nfsver, procnum. A duplicate 954 * response means we didn't wait long enough so 955 * we increase the SRTT to avoid future spurious 956 * timeouts. 957 */ 958 u_int procnum = nmp->nm_lastreprocnum; 959 int n; 960 961 if (procnum < NFS_NPROCS && proct[procnum]) { 962 if (nfs_showrexmit) 963 kprintf("D"); 964 n = nmp->nm_srtt[proct[procnum]]; 965 n += NFS_ASYSCALE * NFS_HZ; 966 if (n < NFS_ASYSCALE * NFS_HZ * 10) 967 n = NFS_ASYSCALE * NFS_HZ * 10; 968 nmp->nm_srtt[proct[procnum]] = n; 969 } 970 } 971 nfs_rcvunlock(nmp); 972 crit_exit(); 973 974 /* 975 * If not matched to a request, drop it. 976 * If it's mine, get out. 977 */ 978 if (rep == NULL) { 979 nfsstats.rpcunexpected++; 980 m_freem(info.mrep); 981 info.mrep = NULL; 982 } else if (rep == myrep) { 983 if (rep->r_mrep == NULL) 984 panic("nfsreply nil"); 985 return (0); 986 } 987 } 988 } 989 990 /* 991 * Run the request state machine until the target state is reached 992 * or a fatal error occurs. The target state is not run. Specifying 993 * a target of NFSM_STATE_DONE runs the state machine until the rpc 994 * is complete. 995 * 996 * EINPROGRESS is returned for all states other then the DONE state, 997 * indicating that the rpc is still in progress. 998 */ 999 int 1000 nfs_request(struct nfsm_info *info, nfsm_state_t bstate, nfsm_state_t estate) 1001 { 1002 struct nfsreq *req; 1003 1004 while (info->state >= bstate && info->state < estate) { 1005 switch(info->state) { 1006 case NFSM_STATE_SETUP: 1007 /* 1008 * Setup the nfsreq. Any error which occurs during 1009 * this state is fatal. 1010 */ 1011 info->error = nfs_request_setup(info); 1012 if (info->error) { 1013 info->state = NFSM_STATE_DONE; 1014 return (info->error); 1015 } else { 1016 req = info->req; 1017 req->r_mrp = &info->mrep; 1018 req->r_mdp = &info->md; 1019 req->r_dposp = &info->dpos; 1020 info->state = NFSM_STATE_AUTH; 1021 } 1022 break; 1023 case NFSM_STATE_AUTH: 1024 /* 1025 * Authenticate the nfsreq. Any error which occurs 1026 * during this state is fatal. 1027 */ 1028 info->error = nfs_request_auth(info->req); 1029 if (info->error) { 1030 info->state = NFSM_STATE_DONE; 1031 return (info->error); 1032 } else { 1033 info->state = NFSM_STATE_TRY; 1034 } 1035 break; 1036 case NFSM_STATE_TRY: 1037 /* 1038 * Transmit or retransmit attempt. An error in this 1039 * state is ignored and we always move on to the 1040 * next state. 1041 * 1042 * This can trivially race the receiver if the 1043 * request is asynchronous. nfs_request_try() 1044 * will thus set the state for us and we 1045 * must also return immediately if we are 1046 * running an async state machine, because 1047 * info can become invalid due to races after 1048 * try() returns. 1049 */ 1050 if (info->req->r_flags & R_ASYNC) { 1051 nfs_request_try(info->req); 1052 if (estate == NFSM_STATE_WAITREPLY) 1053 return (EINPROGRESS); 1054 } else { 1055 nfs_request_try(info->req); 1056 info->state = NFSM_STATE_WAITREPLY; 1057 } 1058 break; 1059 case NFSM_STATE_WAITREPLY: 1060 /* 1061 * Wait for a reply or timeout and move on to the 1062 * next state. The error returned by this state 1063 * is passed to the processing code in the next 1064 * state. 1065 */ 1066 info->error = nfs_request_waitreply(info->req); 1067 info->state = NFSM_STATE_PROCESSREPLY; 1068 break; 1069 case NFSM_STATE_PROCESSREPLY: 1070 /* 1071 * Process the reply or timeout. Errors which occur 1072 * in this state may cause the state machine to 1073 * go back to an earlier state, and are fatal 1074 * otherwise. 1075 */ 1076 info->error = nfs_request_processreply(info, 1077 info->error); 1078 switch(info->error) { 1079 case ENEEDAUTH: 1080 info->state = NFSM_STATE_AUTH; 1081 break; 1082 case EAGAIN: 1083 info->state = NFSM_STATE_TRY; 1084 break; 1085 default: 1086 /* 1087 * Operation complete, with or without an 1088 * error. We are done. 1089 */ 1090 info->req = NULL; 1091 info->state = NFSM_STATE_DONE; 1092 return (info->error); 1093 } 1094 break; 1095 case NFSM_STATE_DONE: 1096 /* 1097 * Shouldn't be reached 1098 */ 1099 return (info->error); 1100 /* NOT REACHED */ 1101 } 1102 } 1103 1104 /* 1105 * If we are done return the error code (if any). 1106 * Otherwise return EINPROGRESS. 1107 */ 1108 if (info->state == NFSM_STATE_DONE) 1109 return (info->error); 1110 return (EINPROGRESS); 1111 } 1112 1113 /* 1114 * nfs_request - goes something like this 1115 * - fill in request struct 1116 * - links it into list 1117 * - calls nfs_send() for first transmit 1118 * - calls nfs_receive() to get reply 1119 * - break down rpc header and return with nfs reply pointed to 1120 * by mrep or error 1121 * nb: always frees up mreq mbuf list 1122 */ 1123 static int 1124 nfs_request_setup(nfsm_info_t info) 1125 { 1126 struct nfsreq *req; 1127 struct nfsmount *nmp; 1128 struct mbuf *m; 1129 int i; 1130 1131 /* 1132 * Reject requests while attempting a forced unmount. 1133 */ 1134 if (info->vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { 1135 m_freem(info->mreq); 1136 info->mreq = NULL; 1137 return (ESTALE); 1138 } 1139 nmp = VFSTONFS(info->vp->v_mount); 1140 req = kmalloc(sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 1141 req->r_nmp = nmp; 1142 req->r_vp = info->vp; 1143 req->r_td = info->td; 1144 req->r_procnum = info->procnum; 1145 req->r_mreq = NULL; 1146 req->r_cred = info->cred; 1147 1148 i = 0; 1149 m = info->mreq; 1150 while (m) { 1151 i += m->m_len; 1152 m = m->m_next; 1153 } 1154 req->r_mrest = info->mreq; 1155 req->r_mrest_len = i; 1156 1157 /* 1158 * The presence of a non-NULL r_info in req indicates 1159 * async completion via our helper threads. See the receiver 1160 * code. 1161 */ 1162 if (info->bio) { 1163 req->r_info = info; 1164 req->r_flags = R_ASYNC; 1165 } else { 1166 req->r_info = NULL; 1167 req->r_flags = 0; 1168 } 1169 info->req = req; 1170 return(0); 1171 } 1172 1173 static int 1174 nfs_request_auth(struct nfsreq *rep) 1175 { 1176 struct nfsmount *nmp = rep->r_nmp; 1177 struct mbuf *m; 1178 char nickv[RPCX_NICKVERF]; 1179 int error = 0, auth_len, auth_type; 1180 int verf_len; 1181 u_int32_t xid; 1182 char *auth_str, *verf_str; 1183 struct ucred *cred; 1184 1185 cred = rep->r_cred; 1186 rep->r_failed_auth = 0; 1187 1188 /* 1189 * Get the RPC header with authorization. 1190 */ 1191 verf_str = auth_str = NULL; 1192 if (nmp->nm_flag & NFSMNT_KERB) { 1193 verf_str = nickv; 1194 verf_len = sizeof (nickv); 1195 auth_type = RPCAUTH_KERB4; 1196 bzero((caddr_t)rep->r_key, sizeof(rep->r_key)); 1197 if (rep->r_failed_auth || 1198 nfs_getnickauth(nmp, cred, &auth_str, &auth_len, 1199 verf_str, verf_len)) { 1200 error = nfs_getauth(nmp, rep, cred, &auth_str, 1201 &auth_len, verf_str, &verf_len, rep->r_key); 1202 if (error) { 1203 m_freem(rep->r_mrest); 1204 rep->r_mrest = NULL; 1205 kfree((caddr_t)rep, M_NFSREQ); 1206 return (error); 1207 } 1208 } 1209 } else { 1210 auth_type = RPCAUTH_UNIX; 1211 if (cred->cr_ngroups < 1) 1212 panic("nfsreq nogrps"); 1213 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 1214 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 1215 5 * NFSX_UNSIGNED; 1216 } 1217 if (rep->r_mrest) 1218 nfs_checkpkt(rep->r_mrest, rep->r_mrest_len); 1219 m = nfsm_rpchead(cred, nmp->nm_flag, rep->r_procnum, auth_type, 1220 auth_len, auth_str, verf_len, verf_str, 1221 rep->r_mrest, rep->r_mrest_len, &rep->r_mheadend, &xid); 1222 rep->r_mrest = NULL; 1223 if (auth_str) 1224 kfree(auth_str, M_TEMP); 1225 1226 /* 1227 * For stream protocols, insert a Sun RPC Record Mark. 1228 */ 1229 if (nmp->nm_sotype == SOCK_STREAM) { 1230 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT); 1231 if (m == NULL) { 1232 kfree(rep, M_NFSREQ); 1233 return (ENOBUFS); 1234 } 1235 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1236 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1237 } 1238 1239 nfs_checkpkt(m, m->m_pkthdr.len); 1240 1241 rep->r_mreq = m; 1242 rep->r_xid = xid; 1243 return (0); 1244 } 1245 1246 static int 1247 nfs_request_try(struct nfsreq *rep) 1248 { 1249 struct nfsmount *nmp = rep->r_nmp; 1250 struct mbuf *m2; 1251 int error; 1252 1253 /* 1254 * Request is not on any queue, only the owner has access to it 1255 * so it should not be locked by anyone atm. 1256 * 1257 * Interlock to prevent races. While locked the only remote 1258 * action possible is for r_mrep to be set (once we enqueue it). 1259 */ 1260 if (rep->r_flags == 0xdeadc0de) { 1261 print_backtrace(-1); 1262 panic("flags nbad\n"); 1263 } 1264 KKASSERT((rep->r_flags & (R_LOCKED | R_ONREQQ)) == 0); 1265 if (nmp->nm_flag & NFSMNT_SOFT) 1266 rep->r_retry = nmp->nm_retry; 1267 else 1268 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1269 rep->r_rtt = rep->r_rexmit = 0; 1270 if (proct[rep->r_procnum] > 0) 1271 rep->r_flags |= R_TIMING | R_LOCKED; 1272 else 1273 rep->r_flags |= R_LOCKED; 1274 rep->r_mrep = NULL; 1275 1276 nfsstats.rpcrequests++; 1277 1278 if (nmp->nm_flag & NFSMNT_FORCE) { 1279 rep->r_flags |= R_SOFTTERM; 1280 rep->r_flags &= ~R_LOCKED; 1281 return (0); 1282 } 1283 rep->r_flags |= R_NEEDSXMIT; /* in case send lock races us */ 1284 1285 /* 1286 * Do the client side RPC. 1287 * 1288 * Chain request into list of outstanding requests. Be sure 1289 * to put it LAST so timer finds oldest requests first. Note 1290 * that our control of R_LOCKED prevents the request from 1291 * getting ripped out from under us or transmitted by the 1292 * timer code. 1293 * 1294 * For requests with info structures we must atomically set the 1295 * info's state because the structure could become invalid upon 1296 * return due to races (i.e., if async) 1297 */ 1298 crit_enter(); 1299 mtx_link_init(&rep->r_link); 1300 KKASSERT((rep->r_flags & R_ONREQQ) == 0); 1301 TAILQ_INSERT_TAIL(&nmp->nm_reqq, rep, r_chain); 1302 rep->r_flags |= R_ONREQQ; 1303 ++nmp->nm_reqqlen; 1304 if (rep->r_flags & R_ASYNC) 1305 rep->r_info->state = NFSM_STATE_WAITREPLY; 1306 crit_exit(); 1307 1308 error = 0; 1309 1310 /* 1311 * Send if we can. Congestion control is not handled here any more 1312 * becausing trying to defer the initial send based on the nfs_timer 1313 * requires having a very fast nfs_timer, which is silly. 1314 */ 1315 if (nmp->nm_so) { 1316 if (nmp->nm_soflags & PR_CONNREQUIRED) 1317 error = nfs_sndlock(nmp, rep); 1318 if (error == 0 && (rep->r_flags & R_NEEDSXMIT)) { 1319 m2 = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); 1320 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); 1321 rep->r_flags &= ~R_NEEDSXMIT; 1322 if ((rep->r_flags & R_SENT) == 0) { 1323 rep->r_flags |= R_SENT; 1324 } 1325 if (nmp->nm_soflags & PR_CONNREQUIRED) 1326 nfs_sndunlock(nmp); 1327 } 1328 } else { 1329 rep->r_rtt = -1; 1330 } 1331 if (error == EPIPE) 1332 error = 0; 1333 1334 /* 1335 * Release the lock. The only remote action that may have occurred 1336 * would have been the setting of rep->r_mrep. If this occured 1337 * and the request was async we have to move it to the reader 1338 * thread's queue for action. 1339 * 1340 * For async requests also make sure the reader is woken up so 1341 * it gets on the socket to read responses. 1342 */ 1343 crit_enter(); 1344 if (rep->r_flags & R_ASYNC) { 1345 if (rep->r_mrep) 1346 nfs_hardterm(rep, 1); 1347 rep->r_flags &= ~R_LOCKED; 1348 nfssvc_iod_reader_wakeup(nmp); 1349 } else { 1350 rep->r_flags &= ~R_LOCKED; 1351 } 1352 if (rep->r_flags & R_WANTED) { 1353 rep->r_flags &= ~R_WANTED; 1354 wakeup(rep); 1355 } 1356 crit_exit(); 1357 return (error); 1358 } 1359 1360 /* 1361 * This code is only called for synchronous requests. Completed synchronous 1362 * requests are left on reqq and we remove them before moving on to the 1363 * processing state. 1364 */ 1365 static int 1366 nfs_request_waitreply(struct nfsreq *rep) 1367 { 1368 struct nfsmount *nmp = rep->r_nmp; 1369 int error; 1370 1371 KKASSERT((rep->r_flags & R_ASYNC) == 0); 1372 1373 /* 1374 * Wait until the request is finished. 1375 */ 1376 error = nfs_reply(nmp, rep); 1377 1378 /* 1379 * RPC done, unlink the request, but don't rip it out from under 1380 * the callout timer. 1381 * 1382 * Once unlinked no other receiver or the timer will have 1383 * visibility, so we do not have to set R_LOCKED. 1384 */ 1385 crit_enter(); 1386 while (rep->r_flags & R_LOCKED) { 1387 rep->r_flags |= R_WANTED; 1388 tsleep(rep, 0, "nfstrac", 0); 1389 } 1390 KKASSERT(rep->r_flags & R_ONREQQ); 1391 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain); 1392 rep->r_flags &= ~R_ONREQQ; 1393 --nmp->nm_reqqlen; 1394 if (TAILQ_FIRST(&nmp->nm_bioq) && 1395 nmp->nm_reqqlen <= nfs_maxasyncbio * 2 / 3) { 1396 nfssvc_iod_writer_wakeup(nmp); 1397 } 1398 crit_exit(); 1399 1400 /* 1401 * Decrement the outstanding request count. 1402 */ 1403 if (rep->r_flags & R_SENT) { 1404 rep->r_flags &= ~R_SENT; 1405 } 1406 return (error); 1407 } 1408 1409 /* 1410 * Process reply with error returned from nfs_requet_waitreply(). 1411 * 1412 * Returns EAGAIN if it wants us to loop up to nfs_request_try() again. 1413 * Returns ENEEDAUTH if it wants us to loop up to nfs_request_auth() again. 1414 */ 1415 static int 1416 nfs_request_processreply(nfsm_info_t info, int error) 1417 { 1418 struct nfsreq *req = info->req; 1419 struct nfsmount *nmp = req->r_nmp; 1420 u_int32_t *tl; 1421 int verf_type; 1422 int i; 1423 1424 /* 1425 * If there was a successful reply and a tprintf msg. 1426 * tprintf a response. 1427 */ 1428 if (error == 0 && (req->r_flags & R_TPRINTFMSG)) { 1429 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1430 "is alive again"); 1431 } 1432 info->mrep = req->r_mrep; 1433 info->md = req->r_md; 1434 info->dpos = req->r_dpos; 1435 if (error) { 1436 m_freem(req->r_mreq); 1437 req->r_mreq = NULL; 1438 kfree(req, M_NFSREQ); 1439 info->req = NULL; 1440 return (error); 1441 } 1442 1443 /* 1444 * break down the rpc header and check if ok 1445 */ 1446 NULLOUT(tl = nfsm_dissect(info, 3 * NFSX_UNSIGNED)); 1447 if (*tl++ == rpc_msgdenied) { 1448 if (*tl == rpc_mismatch) { 1449 error = EOPNOTSUPP; 1450 } else if ((nmp->nm_flag & NFSMNT_KERB) && 1451 *tl++ == rpc_autherr) { 1452 if (req->r_failed_auth == 0) { 1453 req->r_failed_auth++; 1454 req->r_mheadend->m_next = NULL; 1455 m_freem(info->mrep); 1456 info->mrep = NULL; 1457 m_freem(req->r_mreq); 1458 req->r_mreq = NULL; 1459 return (ENEEDAUTH); 1460 } else { 1461 error = EAUTH; 1462 } 1463 } else { 1464 error = EACCES; 1465 } 1466 m_freem(info->mrep); 1467 info->mrep = NULL; 1468 m_freem(req->r_mreq); 1469 req->r_mreq = NULL; 1470 kfree(req, M_NFSREQ); 1471 info->req = NULL; 1472 return (error); 1473 } 1474 1475 /* 1476 * Grab any Kerberos verifier, otherwise just throw it away. 1477 */ 1478 verf_type = fxdr_unsigned(int, *tl++); 1479 i = fxdr_unsigned(int32_t, *tl); 1480 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1481 error = nfs_savenickauth(nmp, req->r_cred, i, req->r_key, 1482 &info->md, &info->dpos, info->mrep); 1483 if (error) 1484 goto nfsmout; 1485 } else if (i > 0) { 1486 ERROROUT(nfsm_adv(info, nfsm_rndup(i))); 1487 } 1488 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED)); 1489 /* 0 == ok */ 1490 if (*tl == 0) { 1491 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED)); 1492 if (*tl != 0) { 1493 error = fxdr_unsigned(int, *tl); 1494 1495 /* 1496 * Does anyone even implement this? Just impose 1497 * a 1-second delay. 1498 */ 1499 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1500 error == NFSERR_TRYLATER) { 1501 m_freem(info->mrep); 1502 info->mrep = NULL; 1503 error = 0; 1504 1505 tsleep((caddr_t)&lbolt, 0, "nqnfstry", 0); 1506 return (EAGAIN); /* goto tryagain */ 1507 } 1508 1509 /* 1510 * If the File Handle was stale, invalidate the 1511 * lookup cache, just in case. 1512 * 1513 * To avoid namecache<->vnode deadlocks we must 1514 * release the vnode lock if we hold it. 1515 */ 1516 if (error == ESTALE) { 1517 struct vnode *vp = req->r_vp; 1518 int ltype; 1519 1520 ltype = lockstatus(&vp->v_lock, curthread); 1521 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1522 lockmgr(&vp->v_lock, LK_RELEASE); 1523 cache_inval_vp(vp, CINV_CHILDREN); 1524 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1525 lockmgr(&vp->v_lock, ltype); 1526 } 1527 if (nmp->nm_flag & NFSMNT_NFSV3) { 1528 KKASSERT(*req->r_mrp == info->mrep); 1529 KKASSERT(*req->r_mdp == info->md); 1530 KKASSERT(*req->r_dposp == info->dpos); 1531 error |= NFSERR_RETERR; 1532 } else { 1533 m_freem(info->mrep); 1534 info->mrep = NULL; 1535 } 1536 m_freem(req->r_mreq); 1537 req->r_mreq = NULL; 1538 kfree(req, M_NFSREQ); 1539 info->req = NULL; 1540 return (error); 1541 } 1542 1543 KKASSERT(*req->r_mrp == info->mrep); 1544 KKASSERT(*req->r_mdp == info->md); 1545 KKASSERT(*req->r_dposp == info->dpos); 1546 m_freem(req->r_mreq); 1547 req->r_mreq = NULL; 1548 FREE(req, M_NFSREQ); 1549 return (0); 1550 } 1551 m_freem(info->mrep); 1552 info->mrep = NULL; 1553 error = EPROTONOSUPPORT; 1554 nfsmout: 1555 m_freem(req->r_mreq); 1556 req->r_mreq = NULL; 1557 kfree(req, M_NFSREQ); 1558 info->req = NULL; 1559 return (error); 1560 } 1561 1562 #ifndef NFS_NOSERVER 1563 /* 1564 * Generate the rpc reply header 1565 * siz arg. is used to decide if adding a cluster is worthwhile 1566 */ 1567 int 1568 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, 1569 int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp) 1570 { 1571 u_int32_t *tl; 1572 struct nfsm_info info; 1573 1574 siz += RPC_REPLYSIZ; 1575 info.mb = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL); 1576 info.mreq = info.mb; 1577 info.mreq->m_pkthdr.len = 0; 1578 /* 1579 * If this is not a cluster, try and leave leading space 1580 * for the lower level headers. 1581 */ 1582 if ((max_hdr + siz) < MINCLSIZE) 1583 info.mreq->m_data += max_hdr; 1584 tl = mtod(info.mreq, u_int32_t *); 1585 info.mreq->m_len = 6 * NFSX_UNSIGNED; 1586 info.bpos = ((caddr_t)tl) + info.mreq->m_len; 1587 *tl++ = txdr_unsigned(nd->nd_retxid); 1588 *tl++ = rpc_reply; 1589 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1590 *tl++ = rpc_msgdenied; 1591 if (err & NFSERR_AUTHERR) { 1592 *tl++ = rpc_autherr; 1593 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1594 info.mreq->m_len -= NFSX_UNSIGNED; 1595 info.bpos -= NFSX_UNSIGNED; 1596 } else { 1597 *tl++ = rpc_mismatch; 1598 *tl++ = txdr_unsigned(RPC_VER2); 1599 *tl = txdr_unsigned(RPC_VER2); 1600 } 1601 } else { 1602 *tl++ = rpc_msgaccepted; 1603 1604 /* 1605 * For Kerberos authentication, we must send the nickname 1606 * verifier back, otherwise just RPCAUTH_NULL. 1607 */ 1608 if (nd->nd_flag & ND_KERBFULL) { 1609 struct nfsuid *nuidp; 1610 struct timeval ktvin, ktvout; 1611 1612 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1613 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1614 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1615 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1616 &nuidp->nu_haddr, nd->nd_nam2))) 1617 break; 1618 } 1619 if (nuidp) { 1620 ktvin.tv_sec = 1621 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1622 ktvin.tv_usec = 1623 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1624 1625 /* 1626 * Encrypt the timestamp in ecb mode using the 1627 * session key. 1628 */ 1629 #ifdef NFSKERB 1630 XXX 1631 #else 1632 ktvout.tv_sec = 0; 1633 ktvout.tv_usec = 0; 1634 #endif 1635 1636 *tl++ = rpc_auth_kerb; 1637 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1638 *tl = ktvout.tv_sec; 1639 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED); 1640 *tl++ = ktvout.tv_usec; 1641 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1642 } else { 1643 *tl++ = 0; 1644 *tl++ = 0; 1645 } 1646 } else { 1647 *tl++ = 0; 1648 *tl++ = 0; 1649 } 1650 switch (err) { 1651 case EPROGUNAVAIL: 1652 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1653 break; 1654 case EPROGMISMATCH: 1655 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1656 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 1657 *tl++ = txdr_unsigned(2); 1658 *tl = txdr_unsigned(3); 1659 break; 1660 case EPROCUNAVAIL: 1661 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1662 break; 1663 case EBADRPC: 1664 *tl = txdr_unsigned(RPC_GARBAGE); 1665 break; 1666 default: 1667 *tl = 0; 1668 if (err != NFSERR_RETVOID) { 1669 tl = nfsm_build(&info, NFSX_UNSIGNED); 1670 if (err) 1671 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1672 else 1673 *tl = 0; 1674 } 1675 break; 1676 }; 1677 } 1678 1679 if (mrq != NULL) 1680 *mrq = info.mreq; 1681 *mbp = info.mb; 1682 *bposp = info.bpos; 1683 if (err != 0 && err != NFSERR_RETVOID) 1684 nfsstats.srvrpc_errs++; 1685 return (0); 1686 } 1687 1688 1689 #endif /* NFS_NOSERVER */ 1690 1691 /* 1692 * Nfs timer routine. 1693 * 1694 * Scan the nfsreq list and retranmit any requests that have timed out 1695 * To avoid retransmission attempts on STREAM sockets (in the future) make 1696 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1697 * 1698 * Requests with attached responses, terminated requests, and 1699 * locked requests are ignored. Locked requests will be picked up 1700 * in a later timer call. 1701 */ 1702 void 1703 nfs_timer_callout(void *arg /* never used */) 1704 { 1705 struct nfsmount *nmp; 1706 struct nfsreq *req; 1707 #ifndef NFS_NOSERVER 1708 struct nfssvc_sock *slp; 1709 u_quad_t cur_usec; 1710 #endif /* NFS_NOSERVER */ 1711 1712 lwkt_gettoken(&nfs_token); 1713 TAILQ_FOREACH(nmp, &nfs_mountq, nm_entry) { 1714 lwkt_gettoken(&nmp->nm_token); 1715 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1716 KKASSERT(nmp == req->r_nmp); 1717 if (req->r_mrep) 1718 continue; 1719 if (req->r_flags & (R_SOFTTERM | R_LOCKED)) 1720 continue; 1721 1722 /* 1723 * Handle timeout/retry. Be sure to process r_mrep 1724 * for async requests that completed while we had 1725 * the request locked or they will hang in the reqq 1726 * forever. 1727 */ 1728 req->r_flags |= R_LOCKED; 1729 if (nfs_sigintr(nmp, req, req->r_td)) { 1730 nfs_softterm(req, 1); 1731 req->r_flags &= ~R_LOCKED; 1732 } else { 1733 nfs_timer_req(req); 1734 if (req->r_flags & R_ASYNC) { 1735 if (req->r_mrep) 1736 nfs_hardterm(req, 1); 1737 req->r_flags &= ~R_LOCKED; 1738 nfssvc_iod_reader_wakeup(nmp); 1739 } else { 1740 req->r_flags &= ~R_LOCKED; 1741 } 1742 } 1743 if (req->r_flags & R_WANTED) { 1744 req->r_flags &= ~R_WANTED; 1745 wakeup(req); 1746 } 1747 } 1748 lwkt_reltoken(&nmp->nm_token); 1749 } 1750 #ifndef NFS_NOSERVER 1751 1752 /* 1753 * Scan the write gathering queues for writes that need to be 1754 * completed now. 1755 */ 1756 cur_usec = nfs_curusec(); 1757 1758 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1759 /* XXX race against removal */ 1760 if (lwkt_trytoken(&slp->ns_token)) { 1761 if (slp->ns_tq.lh_first && 1762 (slp->ns_tq.lh_first->nd_time <= cur_usec)) { 1763 nfsrv_wakenfsd(slp, 1); 1764 } 1765 lwkt_reltoken(&slp->ns_token); 1766 } 1767 } 1768 #endif /* NFS_NOSERVER */ 1769 1770 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer_callout, NULL); 1771 lwkt_reltoken(&nfs_token); 1772 } 1773 1774 static 1775 void 1776 nfs_timer_req(struct nfsreq *req) 1777 { 1778 struct thread *td = &thread0; /* XXX for creds, will break if sleep */ 1779 struct nfsmount *nmp = req->r_nmp; 1780 struct mbuf *m; 1781 struct socket *so; 1782 int timeo; 1783 int error; 1784 1785 /* 1786 * rtt ticks and timeout calculation. Return if the timeout 1787 * has not been reached yet, unless the packet is flagged 1788 * for an immediate send. 1789 * 1790 * The mean rtt doesn't help when we get random I/Os, we have 1791 * to multiply by fairly large numbers. 1792 */ 1793 if (req->r_rtt >= 0) { 1794 /* 1795 * Calculate the timeout to test against. 1796 */ 1797 req->r_rtt++; 1798 if (nmp->nm_flag & NFSMNT_DUMBTIMR) { 1799 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS; 1800 } else if (req->r_flags & R_TIMING) { 1801 timeo = NFS_SRTT(req) + NFS_SDRTT(req); 1802 } else { 1803 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS; 1804 } 1805 timeo *= multt[req->r_procnum]; 1806 /* timeo is still scaled by SCALE_BITS */ 1807 1808 #define NFSFS (NFS_RTT_SCALE * NFS_HZ) 1809 if (req->r_flags & R_TIMING) { 1810 static long last_time; 1811 if (nfs_showrtt && last_time != time_second) { 1812 kprintf("rpccmd %d NFS SRTT %d SDRTT %d " 1813 "timeo %d.%03d\n", 1814 proct[req->r_procnum], 1815 NFS_SRTT(req), NFS_SDRTT(req), 1816 timeo / NFSFS, 1817 timeo % NFSFS * 1000 / NFSFS); 1818 last_time = time_second; 1819 } 1820 } 1821 #undef NFSFS 1822 1823 /* 1824 * deal with nfs_timer jitter. 1825 */ 1826 timeo = (timeo >> NFS_RTT_SCALE_BITS) + 1; 1827 if (timeo < 2) 1828 timeo = 2; 1829 1830 if (nmp->nm_timeouts > 0) 1831 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1832 if (timeo > NFS_MAXTIMEO) 1833 timeo = NFS_MAXTIMEO; 1834 if (req->r_rtt <= timeo) { 1835 if ((req->r_flags & R_NEEDSXMIT) == 0) 1836 return; 1837 } else if (nmp->nm_timeouts < 8) { 1838 nmp->nm_timeouts++; 1839 } 1840 } 1841 1842 /* 1843 * Check for server not responding 1844 */ 1845 if ((req->r_flags & R_TPRINTFMSG) == 0 && 1846 req->r_rexmit > nmp->nm_deadthresh) { 1847 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1848 "not responding"); 1849 req->r_flags |= R_TPRINTFMSG; 1850 } 1851 if (req->r_rexmit >= req->r_retry) { /* too many */ 1852 nfsstats.rpctimeouts++; 1853 nfs_softterm(req, 1); 1854 return; 1855 } 1856 1857 /* 1858 * Generally disable retransmission on reliable sockets, 1859 * unless the request is flagged for immediate send. 1860 */ 1861 if (nmp->nm_sotype != SOCK_DGRAM) { 1862 if (++req->r_rexmit > NFS_MAXREXMIT) 1863 req->r_rexmit = NFS_MAXREXMIT; 1864 if ((req->r_flags & R_NEEDSXMIT) == 0) 1865 return; 1866 } 1867 1868 /* 1869 * Stop here if we do not have a socket! 1870 */ 1871 if ((so = nmp->nm_so) == NULL) 1872 return; 1873 1874 /* 1875 * If there is enough space and the window allows.. resend it. 1876 * 1877 * r_rtt is left intact in case we get an answer after the 1878 * retry that was a reply to the original packet. 1879 * 1880 * NOTE: so_pru_send() 1881 */ 1882 if (ssb_space(&so->so_snd) >= req->r_mreq->m_pkthdr.len && 1883 (req->r_flags & (R_SENT | R_NEEDSXMIT)) && 1884 (m = m_copym(req->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){ 1885 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1886 error = so_pru_send(so, 0, m, NULL, NULL, td); 1887 else 1888 error = so_pru_send(so, 0, m, nmp->nm_nam, NULL, td); 1889 if (error) { 1890 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1891 so->so_error = 0; 1892 req->r_flags |= R_NEEDSXMIT; 1893 } else if (req->r_mrep == NULL) { 1894 /* 1895 * Iff first send, start timing 1896 * else turn timing off, backoff timer 1897 * and divide congestion window by 2. 1898 * 1899 * It is possible for the so_pru_send() to 1900 * block and for us to race a reply so we 1901 * only do this if the reply field has not 1902 * been filled in. R_LOCKED will prevent 1903 * the request from being ripped out from under 1904 * us entirely. 1905 * 1906 * Record the last resent procnum to aid us 1907 * in duplicate detection on receive. 1908 */ 1909 if ((req->r_flags & R_NEEDSXMIT) == 0) { 1910 if (nfs_showrexmit) 1911 kprintf("X"); 1912 if (++req->r_rexmit > NFS_MAXREXMIT) 1913 req->r_rexmit = NFS_MAXREXMIT; 1914 nmp->nm_maxasync_scaled >>= 1; 1915 if (nmp->nm_maxasync_scaled < NFS_MINASYNC_SCALED) 1916 nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED; 1917 nfsstats.rpcretries++; 1918 nmp->nm_lastreprocnum = req->r_procnum; 1919 } else { 1920 req->r_flags |= R_SENT; 1921 req->r_flags &= ~R_NEEDSXMIT; 1922 } 1923 } 1924 } 1925 } 1926 1927 /* 1928 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1929 * wait for all requests to complete. This is used by forced unmounts 1930 * to terminate any outstanding RPCs. 1931 * 1932 * Locked requests cannot be canceled but will be marked for 1933 * soft-termination. 1934 */ 1935 int 1936 nfs_nmcancelreqs(struct nfsmount *nmp) 1937 { 1938 struct nfsreq *req; 1939 int i; 1940 1941 crit_enter(); 1942 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1943 if (req->r_mrep != NULL || (req->r_flags & R_SOFTTERM)) 1944 continue; 1945 nfs_softterm(req, 0); 1946 } 1947 /* XXX the other two queues as well */ 1948 crit_exit(); 1949 1950 for (i = 0; i < 30; i++) { 1951 crit_enter(); 1952 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1953 if (nmp == req->r_nmp) 1954 break; 1955 } 1956 crit_exit(); 1957 if (req == NULL) 1958 return (0); 1959 tsleep(&lbolt, 0, "nfscancel", 0); 1960 } 1961 return (EBUSY); 1962 } 1963 1964 /* 1965 * Soft-terminate a request, effectively marking it as failed. 1966 * 1967 * Must be called from within a critical section. 1968 */ 1969 static void 1970 nfs_softterm(struct nfsreq *rep, int islocked) 1971 { 1972 rep->r_flags |= R_SOFTTERM; 1973 nfs_hardterm(rep, islocked); 1974 } 1975 1976 /* 1977 * Hard-terminate a request, typically after getting a response. 1978 * 1979 * The state machine can still decide to re-issue it later if necessary. 1980 * 1981 * Must be called from within a critical section. 1982 */ 1983 static void 1984 nfs_hardterm(struct nfsreq *rep, int islocked) 1985 { 1986 struct nfsmount *nmp = rep->r_nmp; 1987 1988 /* 1989 * The nm_send count is decremented now to avoid deadlocks 1990 * when the process in soreceive() hasn't yet managed to send 1991 * its own request. 1992 */ 1993 if (rep->r_flags & R_SENT) { 1994 rep->r_flags &= ~R_SENT; 1995 } 1996 1997 /* 1998 * If we locked the request or nobody else has locked the request, 1999 * and the request is async, we can move it to the reader thread's 2000 * queue now and fix up the state. 2001 * 2002 * If we locked the request or nobody else has locked the request, 2003 * we can wake up anyone blocked waiting for a response on the 2004 * request. 2005 */ 2006 if (islocked || (rep->r_flags & R_LOCKED) == 0) { 2007 if ((rep->r_flags & (R_ONREQQ | R_ASYNC)) == 2008 (R_ONREQQ | R_ASYNC)) { 2009 rep->r_flags &= ~R_ONREQQ; 2010 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain); 2011 --nmp->nm_reqqlen; 2012 TAILQ_INSERT_TAIL(&nmp->nm_reqrxq, rep, r_chain); 2013 KKASSERT(rep->r_info->state == NFSM_STATE_TRY || 2014 rep->r_info->state == NFSM_STATE_WAITREPLY); 2015 rep->r_info->state = NFSM_STATE_PROCESSREPLY; 2016 nfssvc_iod_reader_wakeup(nmp); 2017 if (TAILQ_FIRST(&nmp->nm_bioq) && 2018 nmp->nm_reqqlen <= nfs_maxasyncbio * 2 / 3) { 2019 nfssvc_iod_writer_wakeup(nmp); 2020 } 2021 } 2022 mtx_abort_ex_link(&nmp->nm_rxlock, &rep->r_link); 2023 } 2024 } 2025 2026 /* 2027 * Test for a termination condition pending on the process. 2028 * This is used for NFSMNT_INT mounts. 2029 */ 2030 int 2031 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td) 2032 { 2033 sigset_t tmpset; 2034 struct proc *p; 2035 struct lwp *lp; 2036 2037 if (rep && (rep->r_flags & R_SOFTTERM)) 2038 return (EINTR); 2039 /* Terminate all requests while attempting a forced unmount. */ 2040 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) 2041 return (EINTR); 2042 if (!(nmp->nm_flag & NFSMNT_INT)) 2043 return (0); 2044 /* td might be NULL YYY */ 2045 if (td == NULL || (p = td->td_proc) == NULL) 2046 return (0); 2047 2048 lp = td->td_lwp; 2049 tmpset = lwp_sigpend(lp); 2050 SIGSETNAND(tmpset, lp->lwp_sigmask); 2051 SIGSETNAND(tmpset, p->p_sigignore); 2052 if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset)) 2053 return (EINTR); 2054 2055 return (0); 2056 } 2057 2058 /* 2059 * Lock a socket against others. 2060 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 2061 * and also to avoid race conditions between the processes with nfs requests 2062 * in progress when a reconnect is necessary. 2063 */ 2064 int 2065 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) 2066 { 2067 mtx_t mtx = &nmp->nm_txlock; 2068 struct thread *td; 2069 int slptimeo; 2070 int slpflag; 2071 int error; 2072 2073 slpflag = 0; 2074 slptimeo = 0; 2075 td = rep ? rep->r_td : NULL; 2076 if (nmp->nm_flag & NFSMNT_INT) 2077 slpflag = PCATCH; 2078 2079 while ((error = mtx_lock_ex_try(mtx)) != 0) { 2080 if (nfs_sigintr(nmp, rep, td)) { 2081 error = EINTR; 2082 break; 2083 } 2084 error = mtx_lock_ex(mtx, "nfsndlck", slpflag, slptimeo); 2085 if (error == 0) 2086 break; 2087 if (slpflag == PCATCH) { 2088 slpflag = 0; 2089 slptimeo = 2 * hz; 2090 } 2091 } 2092 /* Always fail if our request has been cancelled. */ 2093 if (rep && (rep->r_flags & R_SOFTTERM)) { 2094 if (error == 0) 2095 mtx_unlock(mtx); 2096 error = EINTR; 2097 } 2098 return (error); 2099 } 2100 2101 /* 2102 * Unlock the stream socket for others. 2103 */ 2104 void 2105 nfs_sndunlock(struct nfsmount *nmp) 2106 { 2107 mtx_unlock(&nmp->nm_txlock); 2108 } 2109 2110 /* 2111 * Lock the receiver side of the socket. 2112 * 2113 * rep may be NULL. 2114 */ 2115 static int 2116 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep) 2117 { 2118 mtx_t mtx = &nmp->nm_rxlock; 2119 int slpflag; 2120 int slptimeo; 2121 int error; 2122 2123 /* 2124 * Unconditionally check for completion in case another nfsiod 2125 * get the packet while the caller was blocked, before the caller 2126 * called us. Packet reception is handled by mainline code which 2127 * is protected by the BGL at the moment. 2128 * 2129 * We do not strictly need the second check just before the 2130 * tsleep(), but it's good defensive programming. 2131 */ 2132 if (rep && rep->r_mrep != NULL) 2133 return (EALREADY); 2134 2135 if (nmp->nm_flag & NFSMNT_INT) 2136 slpflag = PCATCH; 2137 else 2138 slpflag = 0; 2139 slptimeo = 0; 2140 2141 while ((error = mtx_lock_ex_try(mtx)) != 0) { 2142 if (nfs_sigintr(nmp, rep, (rep ? rep->r_td : NULL))) { 2143 error = EINTR; 2144 break; 2145 } 2146 if (rep && rep->r_mrep != NULL) { 2147 error = EALREADY; 2148 break; 2149 } 2150 2151 /* 2152 * NOTE: can return ENOLCK, but in that case rep->r_mrep 2153 * will already be set. 2154 */ 2155 if (rep) { 2156 error = mtx_lock_ex_link(mtx, &rep->r_link, 2157 "nfsrcvlk", 2158 slpflag, slptimeo); 2159 } else { 2160 error = mtx_lock_ex(mtx, "nfsrcvlk", slpflag, slptimeo); 2161 } 2162 if (error == 0) 2163 break; 2164 2165 /* 2166 * If our reply was recieved while we were sleeping, 2167 * then just return without taking the lock to avoid a 2168 * situation where a single iod could 'capture' the 2169 * recieve lock. 2170 */ 2171 if (rep && rep->r_mrep != NULL) { 2172 error = EALREADY; 2173 break; 2174 } 2175 if (slpflag == PCATCH) { 2176 slpflag = 0; 2177 slptimeo = 2 * hz; 2178 } 2179 } 2180 if (error == 0) { 2181 if (rep && rep->r_mrep != NULL) { 2182 error = EALREADY; 2183 mtx_unlock(mtx); 2184 } 2185 } 2186 return (error); 2187 } 2188 2189 /* 2190 * Unlock the stream socket for others. 2191 */ 2192 static void 2193 nfs_rcvunlock(struct nfsmount *nmp) 2194 { 2195 mtx_unlock(&nmp->nm_rxlock); 2196 } 2197 2198 /* 2199 * nfs_realign: 2200 * 2201 * Check for badly aligned mbuf data and realign by copying the unaligned 2202 * portion of the data into a new mbuf chain and freeing the portions 2203 * of the old chain that were replaced. 2204 * 2205 * We cannot simply realign the data within the existing mbuf chain 2206 * because the underlying buffers may contain other rpc commands and 2207 * we cannot afford to overwrite them. 2208 * 2209 * We would prefer to avoid this situation entirely. The situation does 2210 * not occur with NFS/UDP and is supposed to only occassionally occur 2211 * with TCP. Use vfs.nfs.realign_count and realign_test to check this. 2212 * 2213 * NOTE! MB_DONTWAIT cannot be used here. The mbufs must be acquired 2214 * because the rpc request OR reply cannot be thrown away. TCP NFS 2215 * mounts do not retry their RPCs unless the TCP connection itself 2216 * is dropped so throwing away a RPC will basically cause the NFS 2217 * operation to lockup indefinitely. 2218 */ 2219 static void 2220 nfs_realign(struct mbuf **pm, int hsiz) 2221 { 2222 struct mbuf *m; 2223 struct mbuf *n = NULL; 2224 2225 /* 2226 * Check for misalignemnt 2227 */ 2228 ++nfs_realign_test; 2229 while ((m = *pm) != NULL) { 2230 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) 2231 break; 2232 pm = &m->m_next; 2233 } 2234 2235 /* 2236 * If misalignment found make a completely new copy. 2237 */ 2238 if (m) { 2239 ++nfs_realign_count; 2240 n = m_dup_data(m, MB_WAIT); 2241 m_freem(*pm); 2242 *pm = n; 2243 } 2244 } 2245 2246 #ifndef NFS_NOSERVER 2247 2248 /* 2249 * Parse an RPC request 2250 * - verify it 2251 * - fill in the cred struct. 2252 */ 2253 int 2254 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 2255 { 2256 int len, i; 2257 u_int32_t *tl; 2258 struct uio uio; 2259 struct iovec iov; 2260 caddr_t cp; 2261 u_int32_t nfsvers, auth_type; 2262 uid_t nickuid; 2263 int error = 0, ticklen; 2264 struct nfsuid *nuidp; 2265 struct timeval tvin, tvout; 2266 struct nfsm_info info; 2267 #if 0 /* until encrypted keys are implemented */ 2268 NFSKERBKEYSCHED_T keys; /* stores key schedule */ 2269 #endif 2270 2271 info.mrep = nd->nd_mrep; 2272 info.md = nd->nd_md; 2273 info.dpos = nd->nd_dpos; 2274 2275 if (has_header) { 2276 NULLOUT(tl = nfsm_dissect(&info, 10 * NFSX_UNSIGNED)); 2277 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 2278 if (*tl++ != rpc_call) { 2279 m_freem(info.mrep); 2280 return (EBADRPC); 2281 } 2282 } else { 2283 NULLOUT(tl = nfsm_dissect(&info, 8 * NFSX_UNSIGNED)); 2284 } 2285 nd->nd_repstat = 0; 2286 nd->nd_flag = 0; 2287 if (*tl++ != rpc_vers) { 2288 nd->nd_repstat = ERPCMISMATCH; 2289 nd->nd_procnum = NFSPROC_NOOP; 2290 return (0); 2291 } 2292 if (*tl != nfs_prog) { 2293 nd->nd_repstat = EPROGUNAVAIL; 2294 nd->nd_procnum = NFSPROC_NOOP; 2295 return (0); 2296 } 2297 tl++; 2298 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 2299 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 2300 nd->nd_repstat = EPROGMISMATCH; 2301 nd->nd_procnum = NFSPROC_NOOP; 2302 return (0); 2303 } 2304 if (nfsvers == NFS_VER3) 2305 nd->nd_flag = ND_NFSV3; 2306 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 2307 if (nd->nd_procnum == NFSPROC_NULL) 2308 return (0); 2309 if (nd->nd_procnum >= NFS_NPROCS || 2310 (nd->nd_procnum >= NQNFSPROC_GETLEASE) || 2311 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 2312 nd->nd_repstat = EPROCUNAVAIL; 2313 nd->nd_procnum = NFSPROC_NOOP; 2314 return (0); 2315 } 2316 if ((nd->nd_flag & ND_NFSV3) == 0) 2317 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 2318 auth_type = *tl++; 2319 len = fxdr_unsigned(int, *tl++); 2320 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2321 m_freem(info.mrep); 2322 return (EBADRPC); 2323 } 2324 2325 nd->nd_flag &= ~ND_KERBAUTH; 2326 /* 2327 * Handle auth_unix or auth_kerb. 2328 */ 2329 if (auth_type == rpc_auth_unix) { 2330 len = fxdr_unsigned(int, *++tl); 2331 if (len < 0 || len > NFS_MAXNAMLEN) { 2332 m_freem(info.mrep); 2333 return (EBADRPC); 2334 } 2335 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2336 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2337 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 2338 nd->nd_cr.cr_ref = 1; 2339 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 2340 nd->nd_cr.cr_ruid = nd->nd_cr.cr_svuid = nd->nd_cr.cr_uid; 2341 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 2342 nd->nd_cr.cr_rgid = nd->nd_cr.cr_svgid = nd->nd_cr.cr_gid; 2343 len = fxdr_unsigned(int, *tl); 2344 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2345 m_freem(info.mrep); 2346 return (EBADRPC); 2347 } 2348 NULLOUT(tl = nfsm_dissect(&info, (len + 2) * NFSX_UNSIGNED)); 2349 for (i = 1; i <= len; i++) 2350 if (i < NGROUPS) 2351 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 2352 else 2353 tl++; 2354 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 2355 if (nd->nd_cr.cr_ngroups > 1) 2356 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 2357 len = fxdr_unsigned(int, *++tl); 2358 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2359 m_freem(info.mrep); 2360 return (EBADRPC); 2361 } 2362 if (len > 0) { 2363 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2364 } 2365 } else if (auth_type == rpc_auth_kerb) { 2366 switch (fxdr_unsigned(int, *tl++)) { 2367 case RPCAKN_FULLNAME: 2368 ticklen = fxdr_unsigned(int, *tl); 2369 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2370 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2371 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2372 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2373 m_freem(info.mrep); 2374 return (EBADRPC); 2375 } 2376 uio.uio_offset = 0; 2377 uio.uio_iov = &iov; 2378 uio.uio_iovcnt = 1; 2379 uio.uio_segflg = UIO_SYSSPACE; 2380 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 2381 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2382 ERROROUT(nfsm_mtouio(&info, &uio, uio.uio_resid)); 2383 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2384 if (*tl++ != rpc_auth_kerb || 2385 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2386 kprintf("Bad kerb verifier\n"); 2387 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2388 nd->nd_procnum = NFSPROC_NOOP; 2389 return (0); 2390 } 2391 NULLOUT(cp = nfsm_dissect(&info, 4 * NFSX_UNSIGNED)); 2392 tl = (u_int32_t *)cp; 2393 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2394 kprintf("Not fullname kerb verifier\n"); 2395 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2396 nd->nd_procnum = NFSPROC_NOOP; 2397 return (0); 2398 } 2399 cp += NFSX_UNSIGNED; 2400 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 2401 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2402 nd->nd_flag |= ND_KERBFULL; 2403 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2404 break; 2405 case RPCAKN_NICKNAME: 2406 if (len != 2 * NFSX_UNSIGNED) { 2407 kprintf("Kerb nickname short\n"); 2408 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2409 nd->nd_procnum = NFSPROC_NOOP; 2410 return (0); 2411 } 2412 nickuid = fxdr_unsigned(uid_t, *tl); 2413 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2414 if (*tl++ != rpc_auth_kerb || 2415 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2416 kprintf("Kerb nick verifier bad\n"); 2417 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2418 nd->nd_procnum = NFSPROC_NOOP; 2419 return (0); 2420 } 2421 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2422 tvin.tv_sec = *tl++; 2423 tvin.tv_usec = *tl; 2424 2425 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 2426 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 2427 if (nuidp->nu_cr.cr_uid == nickuid && 2428 (!nd->nd_nam2 || 2429 netaddr_match(NU_NETFAM(nuidp), 2430 &nuidp->nu_haddr, nd->nd_nam2))) 2431 break; 2432 } 2433 if (!nuidp) { 2434 nd->nd_repstat = 2435 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2436 nd->nd_procnum = NFSPROC_NOOP; 2437 return (0); 2438 } 2439 2440 /* 2441 * Now, decrypt the timestamp using the session key 2442 * and validate it. 2443 */ 2444 #ifdef NFSKERB 2445 XXX 2446 #else 2447 tvout.tv_sec = 0; 2448 tvout.tv_usec = 0; 2449 #endif 2450 2451 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2452 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2453 if (nuidp->nu_expire < time_second || 2454 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2455 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2456 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2457 nuidp->nu_expire = 0; 2458 nd->nd_repstat = 2459 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2460 nd->nd_procnum = NFSPROC_NOOP; 2461 return (0); 2462 } 2463 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 2464 nd->nd_flag |= ND_KERBNICK; 2465 }; 2466 } else { 2467 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2468 nd->nd_procnum = NFSPROC_NOOP; 2469 return (0); 2470 } 2471 2472 nd->nd_md = info.md; 2473 nd->nd_dpos = info.dpos; 2474 return (0); 2475 nfsmout: 2476 return (error); 2477 } 2478 2479 #endif 2480 2481 /* 2482 * Send a message to the originating process's terminal. The thread and/or 2483 * process may be NULL. YYY the thread should not be NULL but there may 2484 * still be some uio_td's that are still being passed as NULL through to 2485 * nfsm_request(). 2486 */ 2487 static int 2488 nfs_msg(struct thread *td, char *server, char *msg) 2489 { 2490 tpr_t tpr; 2491 2492 if (td && td->td_proc) 2493 tpr = tprintf_open(td->td_proc); 2494 else 2495 tpr = NULL; 2496 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2497 tprintf_close(tpr); 2498 return (0); 2499 } 2500 2501 #ifndef NFS_NOSERVER 2502 2503 /* 2504 * Socket upcall routine for nfsd sockets. This runs in the protocol 2505 * thread and passes waitflag == MB_DONTWAIT. 2506 */ 2507 void 2508 nfsrv_rcv_upcall(struct socket *so, void *arg, int waitflag) 2509 { 2510 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2511 2512 if (slp->ns_needq_upcall == 0) { 2513 slp->ns_needq_upcall = 1; /* ok to race */ 2514 lwkt_gettoken(&nfs_token); 2515 nfsrv_wakenfsd(slp, 1); 2516 lwkt_reltoken(&nfs_token); 2517 } 2518 #if 0 2519 lwkt_gettoken(&slp->ns_token); 2520 slp->ns_flag |= SLP_NEEDQ; 2521 nfsrv_rcv(so, arg, waitflag); 2522 lwkt_reltoken(&slp->ns_token); 2523 #endif 2524 } 2525 2526 /* 2527 * Process new data on a receive socket. Essentially do as much as we can 2528 * non-blocking, else punt and it will be called with MB_WAIT from an nfsd. 2529 * 2530 * slp->ns_token is held on call 2531 */ 2532 void 2533 nfsrv_rcv(struct socket *so, void *arg, int waitflag) 2534 { 2535 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2536 struct mbuf *m; 2537 struct sockaddr *nam; 2538 struct sockbuf sio; 2539 int flags, error; 2540 int nparallel_wakeup = 0; 2541 2542 ASSERT_LWKT_TOKEN_HELD(&slp->ns_token); 2543 2544 if ((slp->ns_flag & SLP_VALID) == 0) 2545 return; 2546 2547 /* 2548 * Do not allow an infinite number of completed RPC records to build 2549 * up before we stop reading data from the socket. Otherwise we could 2550 * end up holding onto an unreasonable number of mbufs for requests 2551 * waiting for service. 2552 * 2553 * This should give pretty good feedback to the TCP layer and 2554 * prevents a memory crunch for other protocols. 2555 * 2556 * Note that the same service socket can be dispatched to several 2557 * nfs servers simultaniously. The tcp protocol callback calls us 2558 * with MB_DONTWAIT. nfsd calls us with MB_WAIT (typically). 2559 */ 2560 if (NFSRV_RECLIMIT(slp)) 2561 return; 2562 2563 /* 2564 * Handle protocol specifics to parse an RPC request. We always 2565 * pull from the socket using non-blocking I/O. 2566 */ 2567 if (so->so_type == SOCK_STREAM) { 2568 /* 2569 * The data has to be read in an orderly fashion from a TCP 2570 * stream, unlike a UDP socket. It is possible for soreceive 2571 * and/or nfsrv_getstream() to block, so make sure only one 2572 * entity is messing around with the TCP stream at any given 2573 * moment. The receive sockbuf's lock in soreceive is not 2574 * sufficient. 2575 */ 2576 if (slp->ns_flag & SLP_GETSTREAM) 2577 return; 2578 slp->ns_flag |= SLP_GETSTREAM; 2579 2580 /* 2581 * Do soreceive(). Pull out as much data as possible without 2582 * blocking. 2583 */ 2584 sbinit(&sio, 1000000000); 2585 flags = MSG_DONTWAIT; 2586 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags); 2587 if (error || sio.sb_mb == NULL) { 2588 if (error != EWOULDBLOCK) 2589 slp->ns_flag |= SLP_DISCONN; 2590 slp->ns_flag &= ~(SLP_GETSTREAM | SLP_NEEDQ); 2591 goto done; 2592 } 2593 m = sio.sb_mb; 2594 if (slp->ns_rawend) { 2595 slp->ns_rawend->m_next = m; 2596 slp->ns_cc += sio.sb_cc; 2597 } else { 2598 slp->ns_raw = m; 2599 slp->ns_cc = sio.sb_cc; 2600 } 2601 while (m->m_next) 2602 m = m->m_next; 2603 slp->ns_rawend = m; 2604 2605 /* 2606 * Now try and parse as many record(s) as we can out of the 2607 * raw stream data. This will set SLP_DOREC. 2608 */ 2609 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup); 2610 if (error && error != EWOULDBLOCK) 2611 slp->ns_flag |= SLP_DISCONN; 2612 slp->ns_flag &= ~SLP_GETSTREAM; 2613 } else { 2614 /* 2615 * For UDP soreceive typically pulls just one packet, loop 2616 * to get the whole batch. 2617 */ 2618 do { 2619 sbinit(&sio, 1000000000); 2620 flags = MSG_DONTWAIT; 2621 error = so_pru_soreceive(so, &nam, NULL, &sio, 2622 NULL, &flags); 2623 if (sio.sb_mb) { 2624 struct nfsrv_rec *rec; 2625 int mf = (waitflag & MB_DONTWAIT) ? 2626 M_NOWAIT : M_WAITOK; 2627 rec = kmalloc(sizeof(struct nfsrv_rec), 2628 M_NFSRVDESC, mf); 2629 if (!rec) { 2630 if (nam) 2631 FREE(nam, M_SONAME); 2632 m_freem(sio.sb_mb); 2633 continue; 2634 } 2635 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED); 2636 rec->nr_address = nam; 2637 rec->nr_packet = sio.sb_mb; 2638 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2639 ++slp->ns_numrec; 2640 slp->ns_flag |= SLP_DOREC; 2641 ++nparallel_wakeup; 2642 } else { 2643 slp->ns_flag &= ~SLP_NEEDQ; 2644 } 2645 if (error) { 2646 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2647 && error != EWOULDBLOCK) { 2648 slp->ns_flag |= SLP_DISCONN; 2649 break; 2650 } 2651 } 2652 if (NFSRV_RECLIMIT(slp)) 2653 break; 2654 } while (sio.sb_mb); 2655 } 2656 2657 /* 2658 * If we were upcalled from the tcp protocol layer and we have 2659 * fully parsed records ready to go, or there is new data pending, 2660 * or something went wrong, try to wake up a nfsd thread to deal 2661 * with it. 2662 */ 2663 done: 2664 /* XXX this code is currently not executed (nfsrv_rcv_upcall) */ 2665 if (waitflag == MB_DONTWAIT && (slp->ns_flag & SLP_ACTION_MASK)) { 2666 lwkt_gettoken(&nfs_token); 2667 nfsrv_wakenfsd(slp, nparallel_wakeup); 2668 lwkt_reltoken(&nfs_token); 2669 } 2670 } 2671 2672 /* 2673 * Try and extract an RPC request from the mbuf data list received on a 2674 * stream socket. The "waitflag" argument indicates whether or not it 2675 * can sleep. 2676 */ 2677 static int 2678 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp) 2679 { 2680 struct mbuf *m, **mpp; 2681 char *cp1, *cp2; 2682 int len; 2683 struct mbuf *om, *m2, *recm; 2684 u_int32_t recmark; 2685 2686 for (;;) { 2687 if (slp->ns_reclen == 0) { 2688 if (slp->ns_cc < NFSX_UNSIGNED) 2689 return (0); 2690 m = slp->ns_raw; 2691 if (m->m_len >= NFSX_UNSIGNED) { 2692 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 2693 m->m_data += NFSX_UNSIGNED; 2694 m->m_len -= NFSX_UNSIGNED; 2695 } else { 2696 cp1 = (caddr_t)&recmark; 2697 cp2 = mtod(m, caddr_t); 2698 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2699 while (m->m_len == 0) { 2700 m = m->m_next; 2701 cp2 = mtod(m, caddr_t); 2702 } 2703 *cp1++ = *cp2++; 2704 m->m_data++; 2705 m->m_len--; 2706 } 2707 } 2708 slp->ns_cc -= NFSX_UNSIGNED; 2709 recmark = ntohl(recmark); 2710 slp->ns_reclen = recmark & ~0x80000000; 2711 if (recmark & 0x80000000) 2712 slp->ns_flag |= SLP_LASTFRAG; 2713 else 2714 slp->ns_flag &= ~SLP_LASTFRAG; 2715 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) { 2716 log(LOG_ERR, "%s (%d) from nfs client\n", 2717 "impossible packet length", 2718 slp->ns_reclen); 2719 return (EPERM); 2720 } 2721 } 2722 2723 /* 2724 * Now get the record part. 2725 * 2726 * Note that slp->ns_reclen may be 0. Linux sometimes 2727 * generates 0-length RPCs 2728 */ 2729 recm = NULL; 2730 if (slp->ns_cc == slp->ns_reclen) { 2731 recm = slp->ns_raw; 2732 slp->ns_raw = slp->ns_rawend = NULL; 2733 slp->ns_cc = slp->ns_reclen = 0; 2734 } else if (slp->ns_cc > slp->ns_reclen) { 2735 len = 0; 2736 m = slp->ns_raw; 2737 om = NULL; 2738 2739 while (len < slp->ns_reclen) { 2740 if ((len + m->m_len) > slp->ns_reclen) { 2741 m2 = m_copym(m, 0, slp->ns_reclen - len, 2742 waitflag); 2743 if (m2) { 2744 if (om) { 2745 om->m_next = m2; 2746 recm = slp->ns_raw; 2747 } else 2748 recm = m2; 2749 m->m_data += slp->ns_reclen - len; 2750 m->m_len -= slp->ns_reclen - len; 2751 len = slp->ns_reclen; 2752 } else { 2753 return (EWOULDBLOCK); 2754 } 2755 } else if ((len + m->m_len) == slp->ns_reclen) { 2756 om = m; 2757 len += m->m_len; 2758 m = m->m_next; 2759 recm = slp->ns_raw; 2760 om->m_next = NULL; 2761 } else { 2762 om = m; 2763 len += m->m_len; 2764 m = m->m_next; 2765 } 2766 } 2767 slp->ns_raw = m; 2768 slp->ns_cc -= len; 2769 slp->ns_reclen = 0; 2770 } else { 2771 return (0); 2772 } 2773 2774 /* 2775 * Accumulate the fragments into a record. 2776 */ 2777 mpp = &slp->ns_frag; 2778 while (*mpp) 2779 mpp = &((*mpp)->m_next); 2780 *mpp = recm; 2781 if (slp->ns_flag & SLP_LASTFRAG) { 2782 struct nfsrv_rec *rec; 2783 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK; 2784 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf); 2785 if (!rec) { 2786 m_freem(slp->ns_frag); 2787 } else { 2788 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); 2789 rec->nr_address = NULL; 2790 rec->nr_packet = slp->ns_frag; 2791 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2792 ++slp->ns_numrec; 2793 slp->ns_flag |= SLP_DOREC; 2794 ++*countp; 2795 } 2796 slp->ns_frag = NULL; 2797 } 2798 } 2799 } 2800 2801 #ifdef INVARIANTS 2802 2803 /* 2804 * Sanity check our mbuf chain. 2805 */ 2806 static void 2807 nfs_checkpkt(struct mbuf *m, int len) 2808 { 2809 int xlen = 0; 2810 while (m) { 2811 xlen += m->m_len; 2812 m = m->m_next; 2813 } 2814 if (xlen != len) { 2815 panic("nfs_checkpkt: len mismatch %d/%d mbuf %p\n", 2816 xlen, len, m); 2817 } 2818 } 2819 2820 #else 2821 2822 static void 2823 nfs_checkpkt(struct mbuf *m __unused, int len __unused) 2824 { 2825 } 2826 2827 #endif 2828 2829 /* 2830 * Parse an RPC header. 2831 * 2832 * If the socket is invalid or no records are pending we return ENOBUFS. 2833 * The caller must deal with NEEDQ races. 2834 */ 2835 int 2836 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, 2837 struct nfsrv_descript **ndp) 2838 { 2839 struct nfsrv_rec *rec; 2840 struct mbuf *m; 2841 struct sockaddr *nam; 2842 struct nfsrv_descript *nd; 2843 int error; 2844 2845 *ndp = NULL; 2846 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) 2847 return (ENOBUFS); 2848 rec = STAILQ_FIRST(&slp->ns_rec); 2849 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 2850 KKASSERT(slp->ns_numrec > 0); 2851 if (--slp->ns_numrec == 0) 2852 slp->ns_flag &= ~SLP_DOREC; 2853 nam = rec->nr_address; 2854 m = rec->nr_packet; 2855 kfree(rec, M_NFSRVDESC); 2856 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2857 M_NFSRVDESC, M_WAITOK); 2858 nd->nd_md = nd->nd_mrep = m; 2859 nd->nd_nam2 = nam; 2860 nd->nd_dpos = mtod(m, caddr_t); 2861 error = nfs_getreq(nd, nfsd, TRUE); 2862 if (error) { 2863 if (nam) { 2864 FREE(nam, M_SONAME); 2865 } 2866 kfree((caddr_t)nd, M_NFSRVDESC); 2867 return (error); 2868 } 2869 *ndp = nd; 2870 nfsd->nfsd_nd = nd; 2871 return (0); 2872 } 2873 2874 /* 2875 * Try to assign service sockets to nfsd threads based on the number 2876 * of new rpc requests that have been queued on the service socket. 2877 * 2878 * If no nfsd's are available or additonal requests are pending, set the 2879 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for 2880 * the work in the nfssvc_sock list when it is finished processing its 2881 * current work. This flag is only cleared when an nfsd can not find 2882 * any new work to perform. 2883 */ 2884 void 2885 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel) 2886 { 2887 struct nfsd *nd; 2888 2889 if ((slp->ns_flag & SLP_VALID) == 0) 2890 return; 2891 if (nparallel <= 1) 2892 nparallel = 1; 2893 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) { 2894 if (nd->nfsd_flag & NFSD_WAITING) { 2895 nd->nfsd_flag &= ~NFSD_WAITING; 2896 if (nd->nfsd_slp) 2897 panic("nfsd wakeup"); 2898 nfsrv_slpref(slp); 2899 nd->nfsd_slp = slp; 2900 wakeup((caddr_t)nd); 2901 if (--nparallel == 0) 2902 break; 2903 } 2904 } 2905 2906 /* 2907 * If we couldn't assign slp then the NFSDs are all busy and 2908 * we set a flag indicating that there is pending work. 2909 */ 2910 if (nparallel) 2911 nfsd_head_flag |= NFSD_CHECKSLP; 2912 } 2913 #endif /* NFS_NOSERVER */ 2914