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 #include <sys/mutex.h> 65 66 #include <sys/signal2.h> 67 #include <sys/mutex2.h> 68 #include <sys/socketvar2.h> 69 70 #include <netinet/in.h> 71 #include <netinet/tcp.h> 72 #include <sys/thread2.h> 73 74 #include "rpcv2.h" 75 #include "nfsproto.h" 76 #include "nfs.h" 77 #include "xdr_subs.h" 78 #include "nfsm_subs.h" 79 #include "nfsmount.h" 80 #include "nfsnode.h" 81 #include "nfsrtt.h" 82 83 #define TRUE 1 84 #define FALSE 0 85 86 /* 87 * RTT calculations are scaled by 256 (8 bits). A proper fractional 88 * RTT will still be calculated even with a slow NFS timer. 89 */ 90 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum]] 91 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum]] 92 #define NFS_RTT_SCALE_BITS 8 /* bits */ 93 #define NFS_RTT_SCALE 256 /* value */ 94 95 /* 96 * Defines which timer to use for the procnum. 97 * 0 - default 98 * 1 - getattr 99 * 2 - lookup 100 * 3 - read 101 * 4 - write 102 */ 103 static int proct[NFS_NPROCS] = { 104 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, /* 00-09 */ 105 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, /* 10-19 */ 106 0, 5, 0, 0, 0, 0, /* 20-29 */ 107 }; 108 109 static int multt[NFS_NPROCS] = { 110 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 00-09 */ 111 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 10-19 */ 112 1, 2, 1, 1, 1, 1, /* 20-29 */ 113 }; 114 115 static int nfs_backoff[8] = { 2, 3, 5, 8, 13, 21, 34, 55 }; 116 static int nfs_realign_test; 117 static int nfs_realign_count; 118 static int nfs_showrtt; 119 static int nfs_showrexmit; 120 int nfs_maxasyncbio = NFS_MAXASYNCBIO; 121 122 SYSCTL_DECL(_vfs_nfs); 123 124 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, ""); 125 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, ""); 126 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrtt, CTLFLAG_RW, &nfs_showrtt, 0, ""); 127 SYSCTL_INT(_vfs_nfs, OID_AUTO, showrexmit, CTLFLAG_RW, &nfs_showrexmit, 0, ""); 128 SYSCTL_INT(_vfs_nfs, OID_AUTO, maxasyncbio, CTLFLAG_RW, &nfs_maxasyncbio, 0, ""); 129 130 static int nfs_request_setup(nfsm_info_t info); 131 static int nfs_request_auth(struct nfsreq *rep); 132 static int nfs_request_try(struct nfsreq *rep); 133 static int nfs_request_waitreply(struct nfsreq *rep); 134 static int nfs_request_processreply(nfsm_info_t info, int); 135 136 int nfsrtton = 0; 137 struct nfsrtt nfsrtt; 138 struct callout nfs_timer_handle; 139 140 static int nfs_msg (struct thread *,char *,char *); 141 static int nfs_rcvlock (struct nfsmount *nmp, struct nfsreq *myreq); 142 static void nfs_rcvunlock (struct nfsmount *nmp); 143 static void nfs_realign (struct mbuf **pm, int hsiz); 144 static int nfs_receive (struct nfsmount *nmp, struct nfsreq *rep, 145 struct sockaddr **aname, struct mbuf **mp); 146 static void nfs_softterm (struct nfsreq *rep, int islocked); 147 static void nfs_hardterm (struct nfsreq *rep, int islocked); 148 static int nfs_reconnect (struct nfsmount *nmp, struct nfsreq *rep); 149 #ifndef NFS_NOSERVER 150 static int nfsrv_getstream (struct nfssvc_sock *, int, int *); 151 static void nfs_timer_req(struct nfsreq *req); 152 static void nfs_checkpkt(struct mbuf *m, int len); 153 154 int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd, 155 struct nfssvc_sock *slp, 156 struct thread *td, 157 struct mbuf **mreqp) = { 158 nfsrv_null, 159 nfsrv_getattr, 160 nfsrv_setattr, 161 nfsrv_lookup, 162 nfsrv3_access, 163 nfsrv_readlink, 164 nfsrv_read, 165 nfsrv_write, 166 nfsrv_create, 167 nfsrv_mkdir, 168 nfsrv_symlink, 169 nfsrv_mknod, 170 nfsrv_remove, 171 nfsrv_rmdir, 172 nfsrv_rename, 173 nfsrv_link, 174 nfsrv_readdir, 175 nfsrv_readdirplus, 176 nfsrv_statfs, 177 nfsrv_fsinfo, 178 nfsrv_pathconf, 179 nfsrv_commit, 180 nfsrv_noop, 181 nfsrv_noop, 182 nfsrv_noop, 183 nfsrv_noop 184 }; 185 #endif /* NFS_NOSERVER */ 186 187 /* 188 * Initialize sockets and congestion for a new NFS connection. 189 * We do not free the sockaddr if error. 190 */ 191 int 192 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep) 193 { 194 struct socket *so; 195 int error; 196 struct sockaddr *saddr; 197 struct sockaddr_in *sin; 198 struct thread *td = &thread0; /* only used for socreate and sobind */ 199 200 nmp->nm_so = so = NULL; 201 if (nmp->nm_flag & NFSMNT_FORCE) 202 return (EINVAL); 203 saddr = nmp->nm_nam; 204 error = socreate(saddr->sa_family, &so, nmp->nm_sotype, 205 nmp->nm_soproto, td); 206 if (error) 207 goto bad; 208 nmp->nm_soflags = so->so_proto->pr_flags; 209 210 /* 211 * Some servers require that the client port be a reserved port number. 212 */ 213 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 214 struct sockopt sopt; 215 int ip; 216 struct sockaddr_in ssin; 217 218 bzero(&sopt, sizeof sopt); 219 ip = IP_PORTRANGE_LOW; 220 sopt.sopt_level = IPPROTO_IP; 221 sopt.sopt_name = IP_PORTRANGE; 222 sopt.sopt_val = (void *)&ip; 223 sopt.sopt_valsize = sizeof(ip); 224 sopt.sopt_td = NULL; 225 error = sosetopt(so, &sopt); 226 if (error) 227 goto bad; 228 bzero(&ssin, sizeof ssin); 229 sin = &ssin; 230 sin->sin_len = sizeof (struct sockaddr_in); 231 sin->sin_family = AF_INET; 232 sin->sin_addr.s_addr = INADDR_ANY; 233 sin->sin_port = htons(0); 234 error = sobind(so, (struct sockaddr *)sin, td); 235 if (error) 236 goto bad; 237 bzero(&sopt, sizeof sopt); 238 ip = IP_PORTRANGE_DEFAULT; 239 sopt.sopt_level = IPPROTO_IP; 240 sopt.sopt_name = IP_PORTRANGE; 241 sopt.sopt_val = (void *)&ip; 242 sopt.sopt_valsize = sizeof(ip); 243 sopt.sopt_td = NULL; 244 error = sosetopt(so, &sopt); 245 if (error) 246 goto bad; 247 } 248 249 /* 250 * Protocols that do not require connections may be optionally left 251 * unconnected for servers that reply from a port other than NFS_PORT. 252 */ 253 if (nmp->nm_flag & NFSMNT_NOCONN) { 254 if (nmp->nm_soflags & PR_CONNREQUIRED) { 255 error = ENOTCONN; 256 goto bad; 257 } 258 } else { 259 error = soconnect(so, nmp->nm_nam, td); 260 if (error) 261 goto bad; 262 263 /* 264 * Wait for the connection to complete. Cribbed from the 265 * connect system call but with the wait timing out so 266 * that interruptible mounts don't hang here for a long time. 267 */ 268 crit_enter(); 269 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 270 (void) tsleep((caddr_t)&so->so_timeo, 0, 271 "nfscon", 2 * hz); 272 if ((so->so_state & SS_ISCONNECTING) && 273 so->so_error == 0 && rep && 274 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){ 275 soclrstate(so, SS_ISCONNECTING); 276 crit_exit(); 277 goto bad; 278 } 279 } 280 if (so->so_error) { 281 error = so->so_error; 282 so->so_error = 0; 283 crit_exit(); 284 goto bad; 285 } 286 crit_exit(); 287 } 288 so->so_rcv.ssb_timeo = (5 * hz); 289 so->so_snd.ssb_timeo = (5 * hz); 290 291 /* 292 * Get buffer reservation size from sysctl, but impose reasonable 293 * limits. 294 */ 295 if (nmp->nm_sotype == SOCK_STREAM) { 296 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 297 struct sockopt sopt; 298 int val; 299 300 bzero(&sopt, sizeof sopt); 301 sopt.sopt_level = SOL_SOCKET; 302 sopt.sopt_name = SO_KEEPALIVE; 303 sopt.sopt_val = &val; 304 sopt.sopt_valsize = sizeof val; 305 val = 1; 306 sosetopt(so, &sopt); 307 } 308 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 309 struct sockopt sopt; 310 int val; 311 312 bzero(&sopt, sizeof sopt); 313 sopt.sopt_level = IPPROTO_TCP; 314 sopt.sopt_name = TCP_NODELAY; 315 sopt.sopt_val = &val; 316 sopt.sopt_valsize = sizeof val; 317 val = 1; 318 sosetopt(so, &sopt); 319 } 320 } 321 error = soreserve(so, nfs_soreserve, nfs_soreserve, NULL); 322 if (error) 323 goto bad; 324 atomic_set_int(&so->so_rcv.ssb_flags, SSB_NOINTR); 325 atomic_set_int(&so->so_snd.ssb_flags, SSB_NOINTR); 326 327 /* Initialize other non-zero congestion variables */ 328 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = 329 nmp->nm_srtt[3] = (NFS_TIMEO << NFS_RTT_SCALE_BITS); 330 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 331 nmp->nm_sdrtt[3] = 0; 332 nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED; 333 nmp->nm_timeouts = 0; 334 335 /* 336 * Assign nm_so last. The moment nm_so is assigned the nfs_timer() 337 * can mess with the socket. 338 */ 339 nmp->nm_so = so; 340 return (0); 341 342 bad: 343 if (so) { 344 soshutdown(so, SHUT_RDWR); 345 soclose(so, FNONBLOCK); 346 } 347 return (error); 348 } 349 350 /* 351 * Reconnect routine: 352 * Called when a connection is broken on a reliable protocol. 353 * - clean up the old socket 354 * - nfs_connect() again 355 * - set R_NEEDSXMIT for all outstanding requests on mount point 356 * If this fails the mount point is DEAD! 357 * nb: Must be called with the nfs_sndlock() set on the mount point. 358 */ 359 static int 360 nfs_reconnect(struct nfsmount *nmp, struct nfsreq *rep) 361 { 362 struct nfsreq *req; 363 int error; 364 365 nfs_disconnect(nmp); 366 if (nmp->nm_rxstate >= NFSSVC_STOPPING) 367 return (EINTR); 368 while ((error = nfs_connect(nmp, rep)) != 0) { 369 if (error == EINTR || error == ERESTART) 370 return (EINTR); 371 if (error == EINVAL) 372 return (error); 373 if (nmp->nm_rxstate >= NFSSVC_STOPPING) 374 return (EINTR); 375 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 376 } 377 378 /* 379 * Loop through outstanding request list and fix up all requests 380 * on old socket. 381 */ 382 crit_enter(); 383 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 384 KKASSERT(req->r_nmp == nmp); 385 req->r_flags |= R_NEEDSXMIT; 386 } 387 crit_exit(); 388 return (0); 389 } 390 391 /* 392 * NFS disconnect. Clean up and unlink. 393 */ 394 void 395 nfs_disconnect(struct nfsmount *nmp) 396 { 397 struct socket *so; 398 399 if (nmp->nm_so) { 400 so = nmp->nm_so; 401 nmp->nm_so = NULL; 402 soshutdown(so, SHUT_RDWR); 403 soclose(so, FNONBLOCK); 404 } 405 } 406 407 void 408 nfs_safedisconnect(struct nfsmount *nmp) 409 { 410 nfs_rcvlock(nmp, NULL); 411 nfs_disconnect(nmp); 412 nfs_rcvunlock(nmp); 413 } 414 415 /* 416 * This is the nfs send routine. For connection based socket types, it 417 * must be called with an nfs_sndlock() on the socket. 418 * "rep == NULL" indicates that it has been called from a server. 419 * For the client side: 420 * - return EINTR if the RPC is terminated, 0 otherwise 421 * - set R_NEEDSXMIT if the send fails for any reason 422 * - do any cleanup required by recoverable socket errors (?) 423 * For the server side: 424 * - return EINTR or ERESTART if interrupted by a signal 425 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 426 * - do any cleanup required by recoverable socket errors (?) 427 */ 428 int 429 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top, 430 struct nfsreq *rep) 431 { 432 struct sockaddr *sendnam; 433 int error, soflags, flags; 434 435 if (rep) { 436 if (rep->r_flags & R_SOFTTERM) { 437 m_freem(top); 438 return (EINTR); 439 } 440 if ((so = rep->r_nmp->nm_so) == NULL) { 441 rep->r_flags |= R_NEEDSXMIT; 442 m_freem(top); 443 return (0); 444 } 445 rep->r_flags &= ~R_NEEDSXMIT; 446 soflags = rep->r_nmp->nm_soflags; 447 } else { 448 soflags = so->so_proto->pr_flags; 449 } 450 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 451 sendnam = NULL; 452 else 453 sendnam = nam; 454 if (so->so_type == SOCK_SEQPACKET) 455 flags = MSG_EOR; 456 else 457 flags = 0; 458 459 /* 460 * calls pru_sosend -> sosend -> so_pru_send -> netrpc 461 */ 462 error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags, 463 curthread /*XXX*/); 464 /* 465 * ENOBUFS for dgram sockets is transient and non fatal. 466 * No need to log, and no need to break a soft mount. 467 */ 468 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 469 error = 0; 470 /* 471 * do backoff retransmit on client 472 */ 473 if (rep) { 474 if ((rep->r_nmp->nm_state & NFSSTA_SENDSPACE) == 0) { 475 rep->r_nmp->nm_state |= NFSSTA_SENDSPACE; 476 kprintf("Warning: NFS: Insufficient sendspace " 477 "(%lu),\n" 478 "\t You must increase vfs.nfs.soreserve" 479 "or decrease vfs.nfs.maxasyncbio\n", 480 so->so_snd.ssb_hiwat); 481 } 482 rep->r_flags |= R_NEEDSXMIT; 483 } 484 } 485 486 if (error) { 487 if (rep) { 488 log(LOG_INFO, "nfs send error %d for server %s\n",error, 489 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 490 /* 491 * Deal with errors for the client side. 492 */ 493 if (rep->r_flags & R_SOFTTERM) 494 error = EINTR; 495 else 496 rep->r_flags |= R_NEEDSXMIT; 497 } else { 498 log(LOG_INFO, "nfsd send error %d\n", error); 499 } 500 501 /* 502 * Handle any recoverable (soft) socket errors here. (?) 503 */ 504 if (error != EINTR && error != ERESTART && 505 error != EWOULDBLOCK && error != EPIPE) 506 error = 0; 507 } 508 return (error); 509 } 510 511 /* 512 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 513 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 514 * Mark and consolidate the data into a new mbuf list. 515 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 516 * small mbufs. 517 * For SOCK_STREAM we must be very careful to read an entire record once 518 * we have read any of it, even if the system call has been interrupted. 519 */ 520 static int 521 nfs_receive(struct nfsmount *nmp, struct nfsreq *rep, 522 struct sockaddr **aname, struct mbuf **mp) 523 { 524 struct socket *so; 525 struct sockbuf sio; 526 struct uio auio; 527 struct iovec aio; 528 struct mbuf *m; 529 struct mbuf *control; 530 u_int32_t len; 531 struct sockaddr **getnam; 532 int error, sotype, rcvflg; 533 struct thread *td = curthread; /* XXX */ 534 535 /* 536 * Set up arguments for soreceive() 537 */ 538 *mp = NULL; 539 *aname = NULL; 540 sotype = nmp->nm_sotype; 541 542 /* 543 * For reliable protocols, lock against other senders/receivers 544 * in case a reconnect is necessary. 545 * For SOCK_STREAM, first get the Record Mark to find out how much 546 * more there is to get. 547 * We must lock the socket against other receivers 548 * until we have an entire rpc request/reply. 549 */ 550 if (sotype != SOCK_DGRAM) { 551 error = nfs_sndlock(nmp, rep); 552 if (error) 553 return (error); 554 tryagain: 555 /* 556 * Check for fatal errors and resending request. 557 */ 558 /* 559 * Ugh: If a reconnect attempt just happened, nm_so 560 * would have changed. NULL indicates a failed 561 * attempt that has essentially shut down this 562 * mount point. 563 */ 564 if (rep && (rep->r_mrep || (rep->r_flags & R_SOFTTERM))) { 565 nfs_sndunlock(nmp); 566 return (EINTR); 567 } 568 so = nmp->nm_so; 569 if (so == NULL) { 570 error = nfs_reconnect(nmp, rep); 571 if (error) { 572 nfs_sndunlock(nmp); 573 return (error); 574 } 575 goto tryagain; 576 } 577 while (rep && (rep->r_flags & R_NEEDSXMIT)) { 578 m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); 579 nfsstats.rpcretries++; 580 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 581 if (error) { 582 if (error == EINTR || error == ERESTART || 583 (error = nfs_reconnect(nmp, rep)) != 0) { 584 nfs_sndunlock(nmp); 585 return (error); 586 } 587 goto tryagain; 588 } 589 } 590 nfs_sndunlock(nmp); 591 if (sotype == SOCK_STREAM) { 592 /* 593 * Get the length marker from the stream 594 */ 595 aio.iov_base = (caddr_t)&len; 596 aio.iov_len = sizeof(u_int32_t); 597 auio.uio_iov = &aio; 598 auio.uio_iovcnt = 1; 599 auio.uio_segflg = UIO_SYSSPACE; 600 auio.uio_rw = UIO_READ; 601 auio.uio_offset = 0; 602 auio.uio_resid = sizeof(u_int32_t); 603 auio.uio_td = td; 604 do { 605 rcvflg = MSG_WAITALL; 606 error = so_pru_soreceive(so, NULL, &auio, NULL, 607 NULL, &rcvflg); 608 if (error == EWOULDBLOCK && rep) { 609 if (rep->r_flags & R_SOFTTERM) 610 return (EINTR); 611 } 612 } while (error == EWOULDBLOCK); 613 614 if (error == 0 && auio.uio_resid > 0) { 615 /* 616 * Only log short packets if not EOF 617 */ 618 if (auio.uio_resid != sizeof(u_int32_t)) 619 log(LOG_INFO, 620 "short receive (%d/%d) from nfs server %s\n", 621 (int)(sizeof(u_int32_t) - auio.uio_resid), 622 (int)sizeof(u_int32_t), 623 nmp->nm_mountp->mnt_stat.f_mntfromname); 624 error = EPIPE; 625 } 626 if (error) 627 goto errout; 628 len = ntohl(len) & ~0x80000000; 629 /* 630 * This is SERIOUS! We are out of sync with the sender 631 * and forcing a disconnect/reconnect is all I can do. 632 */ 633 if (len > NFS_MAXPACKET) { 634 log(LOG_ERR, "%s (%d) from nfs server %s\n", 635 "impossible packet length", 636 len, 637 nmp->nm_mountp->mnt_stat.f_mntfromname); 638 error = EFBIG; 639 goto errout; 640 } 641 642 /* 643 * Get the rest of the packet as an mbuf chain 644 */ 645 sbinit(&sio, len); 646 do { 647 rcvflg = MSG_WAITALL; 648 error = so_pru_soreceive(so, NULL, NULL, &sio, 649 NULL, &rcvflg); 650 } while (error == EWOULDBLOCK || error == EINTR || 651 error == ERESTART); 652 if (error == 0 && sio.sb_cc != len) { 653 if (sio.sb_cc != 0) 654 log(LOG_INFO, 655 "short receive (%zu/%d) from nfs server %s\n", 656 (size_t)len - auio.uio_resid, len, 657 nmp->nm_mountp->mnt_stat.f_mntfromname); 658 error = EPIPE; 659 } 660 *mp = sio.sb_mb; 661 } else { 662 /* 663 * Non-stream, so get the whole packet by not 664 * specifying MSG_WAITALL and by specifying a large 665 * length. 666 * 667 * We have no use for control msg., but must grab them 668 * and then throw them away so we know what is going 669 * on. 670 */ 671 sbinit(&sio, 100000000); 672 do { 673 rcvflg = 0; 674 error = so_pru_soreceive(so, NULL, NULL, &sio, 675 &control, &rcvflg); 676 if (control) 677 m_freem(control); 678 if (error == EWOULDBLOCK && rep) { 679 if (rep->r_flags & R_SOFTTERM) { 680 m_freem(sio.sb_mb); 681 return (EINTR); 682 } 683 } 684 } while (error == EWOULDBLOCK || 685 (error == 0 && sio.sb_mb == NULL && control)); 686 if ((rcvflg & MSG_EOR) == 0) 687 kprintf("Egad!!\n"); 688 if (error == 0 && sio.sb_mb == NULL) 689 error = EPIPE; 690 len = sio.sb_cc; 691 *mp = sio.sb_mb; 692 } 693 errout: 694 if (error && error != EINTR && error != ERESTART) { 695 m_freem(*mp); 696 *mp = NULL; 697 if (error != EPIPE) { 698 log(LOG_INFO, 699 "receive error %d from nfs server %s\n", 700 error, 701 nmp->nm_mountp->mnt_stat.f_mntfromname); 702 } 703 error = nfs_sndlock(nmp, rep); 704 if (!error) { 705 error = nfs_reconnect(nmp, rep); 706 if (!error) 707 goto tryagain; 708 else 709 nfs_sndunlock(nmp); 710 } 711 } 712 } else { 713 if ((so = nmp->nm_so) == NULL) 714 return (EACCES); 715 if (so->so_state & SS_ISCONNECTED) 716 getnam = NULL; 717 else 718 getnam = aname; 719 sbinit(&sio, 100000000); 720 do { 721 rcvflg = 0; 722 error = so_pru_soreceive(so, getnam, NULL, &sio, 723 NULL, &rcvflg); 724 if (error == EWOULDBLOCK && rep && 725 (rep->r_flags & R_SOFTTERM)) { 726 m_freem(sio.sb_mb); 727 return (EINTR); 728 } 729 } while (error == EWOULDBLOCK); 730 731 len = sio.sb_cc; 732 *mp = sio.sb_mb; 733 734 /* 735 * A shutdown may result in no error and no mbuf. 736 * Convert to EPIPE. 737 */ 738 if (*mp == NULL && error == 0) 739 error = EPIPE; 740 } 741 if (error) { 742 m_freem(*mp); 743 *mp = NULL; 744 } 745 746 /* 747 * Search for any mbufs that are not a multiple of 4 bytes long 748 * or with m_data not longword aligned. 749 * These could cause pointer alignment problems, so copy them to 750 * well aligned mbufs. 751 */ 752 nfs_realign(mp, 5 * NFSX_UNSIGNED); 753 return (error); 754 } 755 756 /* 757 * Implement receipt of reply on a socket. 758 * 759 * We must search through the list of received datagrams matching them 760 * with outstanding requests using the xid, until ours is found. 761 * 762 * If myrep is NULL we process packets on the socket until 763 * interrupted or until nm_reqrxq is non-empty. 764 */ 765 /* ARGSUSED */ 766 int 767 nfs_reply(struct nfsmount *nmp, struct nfsreq *myrep) 768 { 769 struct nfsreq *rep; 770 struct sockaddr *nam; 771 u_int32_t rxid; 772 u_int32_t *tl; 773 int error; 774 struct nfsm_info info; 775 776 /* 777 * Loop around until we get our own reply 778 */ 779 for (;;) { 780 /* 781 * Lock against other receivers so that I don't get stuck in 782 * sbwait() after someone else has received my reply for me. 783 * Also necessary for connection based protocols to avoid 784 * race conditions during a reconnect. 785 * 786 * If nfs_rcvlock() returns EALREADY, that means that 787 * the reply has already been recieved by another 788 * process and we can return immediately. In this 789 * case, the lock is not taken to avoid races with 790 * other processes. 791 */ 792 info.mrep = NULL; 793 794 error = nfs_rcvlock(nmp, myrep); 795 if (error == EALREADY) 796 return (0); 797 if (error) 798 return (error); 799 800 /* 801 * If myrep is NULL we are the receiver helper thread. 802 * Stop waiting for incoming replies if there are 803 * messages sitting on reqrxq that we need to process, 804 * or if a shutdown request is pending. 805 */ 806 if (myrep == NULL && (TAILQ_FIRST(&nmp->nm_reqrxq) || 807 nmp->nm_rxstate > NFSSVC_PENDING)) { 808 nfs_rcvunlock(nmp); 809 return(EWOULDBLOCK); 810 } 811 812 /* 813 * Get the next Rpc reply off the socket 814 * 815 * We cannot release the receive lock until we've 816 * filled in rep->r_mrep, otherwise a waiting 817 * thread may deadlock in soreceive with no incoming 818 * packets expected. 819 */ 820 error = nfs_receive(nmp, myrep, &nam, &info.mrep); 821 if (error) { 822 /* 823 * Ignore routing errors on connectionless protocols?? 824 */ 825 nfs_rcvunlock(nmp); 826 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 827 if (nmp->nm_so == NULL) 828 return (error); 829 nmp->nm_so->so_error = 0; 830 continue; 831 } 832 return (error); 833 } 834 if (nam) 835 FREE(nam, M_SONAME); 836 837 /* 838 * Get the xid and check that it is an rpc reply 839 */ 840 info.md = info.mrep; 841 info.dpos = mtod(info.md, caddr_t); 842 NULLOUT(tl = nfsm_dissect(&info, 2*NFSX_UNSIGNED)); 843 rxid = *tl++; 844 if (*tl != rpc_reply) { 845 nfsstats.rpcinvalid++; 846 m_freem(info.mrep); 847 info.mrep = NULL; 848 nfsmout: 849 nfs_rcvunlock(nmp); 850 continue; 851 } 852 853 /* 854 * Loop through the request list to match up the reply 855 * Iff no match, just drop the datagram. On match, set 856 * r_mrep atomically to prevent the timer from messing 857 * around with the request after we have exited the critical 858 * section. 859 */ 860 crit_enter(); 861 TAILQ_FOREACH(rep, &nmp->nm_reqq, r_chain) { 862 if (rep->r_mrep == NULL && rxid == rep->r_xid) 863 break; 864 } 865 866 /* 867 * Fill in the rest of the reply if we found a match. 868 * 869 * Deal with duplicate responses if there was no match. 870 */ 871 if (rep) { 872 rep->r_md = info.md; 873 rep->r_dpos = info.dpos; 874 if (nfsrtton) { 875 struct rttl *rt; 876 877 rt = &nfsrtt.rttl[nfsrtt.pos]; 878 rt->proc = rep->r_procnum; 879 rt->rto = 0; 880 rt->sent = 0; 881 rt->cwnd = nmp->nm_maxasync_scaled; 882 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 883 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 884 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 885 getmicrotime(&rt->tstamp); 886 if (rep->r_flags & R_TIMING) 887 rt->rtt = rep->r_rtt; 888 else 889 rt->rtt = 1000000; 890 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 891 } 892 893 /* 894 * New congestion control is based only on async 895 * requests. 896 */ 897 if (nmp->nm_maxasync_scaled < NFS_MAXASYNC_SCALED) 898 ++nmp->nm_maxasync_scaled; 899 if (rep->r_flags & R_SENT) { 900 rep->r_flags &= ~R_SENT; 901 } 902 /* 903 * Update rtt using a gain of 0.125 on the mean 904 * and a gain of 0.25 on the deviation. 905 * 906 * NOTE SRTT/SDRTT are only good if R_TIMING is set. 907 */ 908 if ((rep->r_flags & R_TIMING) && rep->r_rexmit == 0) { 909 /* 910 * Since the timer resolution of 911 * NFS_HZ is so course, it can often 912 * result in r_rtt == 0. Since 913 * r_rtt == N means that the actual 914 * rtt is between N+dt and N+2-dt ticks, 915 * add 1. 916 */ 917 int n; 918 int d; 919 920 #define NFSRSB NFS_RTT_SCALE_BITS 921 n = ((NFS_SRTT(rep) * 7) + 922 (rep->r_rtt << NFSRSB)) >> 3; 923 d = n - NFS_SRTT(rep); 924 NFS_SRTT(rep) = n; 925 926 /* 927 * Don't let the jitter calculation decay 928 * too quickly, but we want a fast rampup. 929 */ 930 if (d < 0) 931 d = -d; 932 d <<= NFSRSB; 933 if (d < NFS_SDRTT(rep)) 934 n = ((NFS_SDRTT(rep) * 15) + d) >> 4; 935 else 936 n = ((NFS_SDRTT(rep) * 3) + d) >> 2; 937 NFS_SDRTT(rep) = n; 938 #undef NFSRSB 939 } 940 nmp->nm_timeouts = 0; 941 rep->r_mrep = info.mrep; 942 nfs_hardterm(rep, 0); 943 } else { 944 /* 945 * Extract vers, prog, nfsver, procnum. A duplicate 946 * response means we didn't wait long enough so 947 * we increase the SRTT to avoid future spurious 948 * timeouts. 949 */ 950 u_int procnum = nmp->nm_lastreprocnum; 951 int n; 952 953 if (procnum < NFS_NPROCS && proct[procnum]) { 954 if (nfs_showrexmit) 955 kprintf("D"); 956 n = nmp->nm_srtt[proct[procnum]]; 957 n += NFS_ASYSCALE * NFS_HZ; 958 if (n < NFS_ASYSCALE * NFS_HZ * 10) 959 n = NFS_ASYSCALE * NFS_HZ * 10; 960 nmp->nm_srtt[proct[procnum]] = n; 961 } 962 } 963 nfs_rcvunlock(nmp); 964 crit_exit(); 965 966 /* 967 * If not matched to a request, drop it. 968 * If it's mine, get out. 969 */ 970 if (rep == NULL) { 971 nfsstats.rpcunexpected++; 972 m_freem(info.mrep); 973 info.mrep = NULL; 974 } else if (rep == myrep) { 975 if (rep->r_mrep == NULL) 976 panic("nfsreply nil"); 977 return (0); 978 } 979 } 980 } 981 982 /* 983 * Run the request state machine until the target state is reached 984 * or a fatal error occurs. The target state is not run. Specifying 985 * a target of NFSM_STATE_DONE runs the state machine until the rpc 986 * is complete. 987 * 988 * EINPROGRESS is returned for all states other then the DONE state, 989 * indicating that the rpc is still in progress. 990 */ 991 int 992 nfs_request(struct nfsm_info *info, nfsm_state_t bstate, nfsm_state_t estate) 993 { 994 struct nfsreq *req; 995 996 while (info->state >= bstate && info->state < estate) { 997 switch(info->state) { 998 case NFSM_STATE_SETUP: 999 /* 1000 * Setup the nfsreq. Any error which occurs during 1001 * this state is fatal. 1002 */ 1003 info->error = nfs_request_setup(info); 1004 if (info->error) { 1005 info->state = NFSM_STATE_DONE; 1006 return (info->error); 1007 } else { 1008 req = info->req; 1009 req->r_mrp = &info->mrep; 1010 req->r_mdp = &info->md; 1011 req->r_dposp = &info->dpos; 1012 info->state = NFSM_STATE_AUTH; 1013 } 1014 break; 1015 case NFSM_STATE_AUTH: 1016 /* 1017 * Authenticate the nfsreq. Any error which occurs 1018 * during this state is fatal. 1019 */ 1020 info->error = nfs_request_auth(info->req); 1021 if (info->error) { 1022 info->state = NFSM_STATE_DONE; 1023 return (info->error); 1024 } else { 1025 info->state = NFSM_STATE_TRY; 1026 } 1027 break; 1028 case NFSM_STATE_TRY: 1029 /* 1030 * Transmit or retransmit attempt. An error in this 1031 * state is ignored and we always move on to the 1032 * next state. 1033 * 1034 * This can trivially race the receiver if the 1035 * request is asynchronous. nfs_request_try() 1036 * will thus set the state for us and we 1037 * must also return immediately if we are 1038 * running an async state machine, because 1039 * info can become invalid due to races after 1040 * try() returns. 1041 */ 1042 if (info->req->r_flags & R_ASYNC) { 1043 nfs_request_try(info->req); 1044 if (estate == NFSM_STATE_WAITREPLY) 1045 return (EINPROGRESS); 1046 } else { 1047 nfs_request_try(info->req); 1048 info->state = NFSM_STATE_WAITREPLY; 1049 } 1050 break; 1051 case NFSM_STATE_WAITREPLY: 1052 /* 1053 * Wait for a reply or timeout and move on to the 1054 * next state. The error returned by this state 1055 * is passed to the processing code in the next 1056 * state. 1057 */ 1058 info->error = nfs_request_waitreply(info->req); 1059 info->state = NFSM_STATE_PROCESSREPLY; 1060 break; 1061 case NFSM_STATE_PROCESSREPLY: 1062 /* 1063 * Process the reply or timeout. Errors which occur 1064 * in this state may cause the state machine to 1065 * go back to an earlier state, and are fatal 1066 * otherwise. 1067 */ 1068 info->error = nfs_request_processreply(info, 1069 info->error); 1070 switch(info->error) { 1071 case ENEEDAUTH: 1072 info->state = NFSM_STATE_AUTH; 1073 break; 1074 case EAGAIN: 1075 info->state = NFSM_STATE_TRY; 1076 break; 1077 default: 1078 /* 1079 * Operation complete, with or without an 1080 * error. We are done. 1081 */ 1082 info->req = NULL; 1083 info->state = NFSM_STATE_DONE; 1084 return (info->error); 1085 } 1086 break; 1087 case NFSM_STATE_DONE: 1088 /* 1089 * Shouldn't be reached 1090 */ 1091 return (info->error); 1092 /* NOT REACHED */ 1093 } 1094 } 1095 1096 /* 1097 * If we are done return the error code (if any). 1098 * Otherwise return EINPROGRESS. 1099 */ 1100 if (info->state == NFSM_STATE_DONE) 1101 return (info->error); 1102 return (EINPROGRESS); 1103 } 1104 1105 /* 1106 * nfs_request - goes something like this 1107 * - fill in request struct 1108 * - links it into list 1109 * - calls nfs_send() for first transmit 1110 * - calls nfs_receive() to get reply 1111 * - break down rpc header and return with nfs reply pointed to 1112 * by mrep or error 1113 * nb: always frees up mreq mbuf list 1114 */ 1115 static int 1116 nfs_request_setup(nfsm_info_t info) 1117 { 1118 struct nfsreq *req; 1119 struct nfsmount *nmp; 1120 struct mbuf *m; 1121 int i; 1122 1123 /* 1124 * Reject requests while attempting a forced unmount. 1125 */ 1126 if (info->vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { 1127 m_freem(info->mreq); 1128 info->mreq = NULL; 1129 return (ESTALE); 1130 } 1131 nmp = VFSTONFS(info->vp->v_mount); 1132 req = kmalloc(sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 1133 req->r_nmp = nmp; 1134 req->r_vp = info->vp; 1135 req->r_td = info->td; 1136 req->r_procnum = info->procnum; 1137 req->r_mreq = NULL; 1138 req->r_cred = info->cred; 1139 1140 i = 0; 1141 m = info->mreq; 1142 while (m) { 1143 i += m->m_len; 1144 m = m->m_next; 1145 } 1146 req->r_mrest = info->mreq; 1147 req->r_mrest_len = i; 1148 1149 /* 1150 * The presence of a non-NULL r_info in req indicates 1151 * async completion via our helper threads. See the receiver 1152 * code. 1153 */ 1154 if (info->bio) { 1155 req->r_info = info; 1156 req->r_flags = R_ASYNC; 1157 } else { 1158 req->r_info = NULL; 1159 req->r_flags = 0; 1160 } 1161 info->req = req; 1162 return(0); 1163 } 1164 1165 static int 1166 nfs_request_auth(struct nfsreq *rep) 1167 { 1168 struct nfsmount *nmp = rep->r_nmp; 1169 struct mbuf *m; 1170 char nickv[RPCX_NICKVERF]; 1171 int error = 0, auth_len, auth_type; 1172 int verf_len; 1173 u_int32_t xid; 1174 char *auth_str, *verf_str; 1175 struct ucred *cred; 1176 1177 cred = rep->r_cred; 1178 rep->r_failed_auth = 0; 1179 1180 /* 1181 * Get the RPC header with authorization. 1182 */ 1183 verf_str = auth_str = NULL; 1184 if (nmp->nm_flag & NFSMNT_KERB) { 1185 verf_str = nickv; 1186 verf_len = sizeof (nickv); 1187 auth_type = RPCAUTH_KERB4; 1188 bzero((caddr_t)rep->r_key, sizeof(rep->r_key)); 1189 if (rep->r_failed_auth || 1190 nfs_getnickauth(nmp, cred, &auth_str, &auth_len, 1191 verf_str, verf_len)) { 1192 error = nfs_getauth(nmp, rep, cred, &auth_str, 1193 &auth_len, verf_str, &verf_len, rep->r_key); 1194 if (error) { 1195 m_freem(rep->r_mrest); 1196 rep->r_mrest = NULL; 1197 kfree((caddr_t)rep, M_NFSREQ); 1198 return (error); 1199 } 1200 } 1201 } else { 1202 auth_type = RPCAUTH_UNIX; 1203 if (cred->cr_ngroups < 1) 1204 panic("nfsreq nogrps"); 1205 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 1206 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 1207 5 * NFSX_UNSIGNED; 1208 } 1209 if (rep->r_mrest) 1210 nfs_checkpkt(rep->r_mrest, rep->r_mrest_len); 1211 m = nfsm_rpchead(cred, nmp->nm_flag, rep->r_procnum, auth_type, 1212 auth_len, auth_str, verf_len, verf_str, 1213 rep->r_mrest, rep->r_mrest_len, &rep->r_mheadend, &xid); 1214 rep->r_mrest = NULL; 1215 if (auth_str) 1216 kfree(auth_str, M_TEMP); 1217 1218 /* 1219 * For stream protocols, insert a Sun RPC Record Mark. 1220 */ 1221 if (nmp->nm_sotype == SOCK_STREAM) { 1222 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT); 1223 if (m == NULL) { 1224 kfree(rep, M_NFSREQ); 1225 return (ENOBUFS); 1226 } 1227 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1228 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1229 } 1230 1231 nfs_checkpkt(m, m->m_pkthdr.len); 1232 1233 rep->r_mreq = m; 1234 rep->r_xid = xid; 1235 return (0); 1236 } 1237 1238 static int 1239 nfs_request_try(struct nfsreq *rep) 1240 { 1241 struct nfsmount *nmp = rep->r_nmp; 1242 struct mbuf *m2; 1243 int error; 1244 1245 /* 1246 * Request is not on any queue, only the owner has access to it 1247 * so it should not be locked by anyone atm. 1248 * 1249 * Interlock to prevent races. While locked the only remote 1250 * action possible is for r_mrep to be set (once we enqueue it). 1251 */ 1252 if (rep->r_flags == 0xdeadc0de) { 1253 print_backtrace(-1); 1254 panic("flags nbad\n"); 1255 } 1256 KKASSERT((rep->r_flags & (R_LOCKED | R_ONREQQ)) == 0); 1257 if (nmp->nm_flag & NFSMNT_SOFT) 1258 rep->r_retry = nmp->nm_retry; 1259 else 1260 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1261 rep->r_rtt = rep->r_rexmit = 0; 1262 if (proct[rep->r_procnum] > 0) 1263 rep->r_flags |= R_TIMING | R_LOCKED; 1264 else 1265 rep->r_flags |= R_LOCKED; 1266 rep->r_mrep = NULL; 1267 1268 /* 1269 * Do the client side RPC. 1270 */ 1271 nfsstats.rpcrequests++; 1272 1273 if (nmp->nm_flag & NFSMNT_FORCE) { 1274 rep->r_flags |= R_SOFTTERM; 1275 rep->r_flags &= ~R_LOCKED; 1276 return (0); 1277 } 1278 1279 /* 1280 * Chain request into list of outstanding requests. Be sure 1281 * to put it LAST so timer finds oldest requests first. Note 1282 * that our control of R_LOCKED prevents the request from 1283 * getting ripped out from under us or transmitted by the 1284 * timer code. 1285 * 1286 * For requests with info structures we must atomically set the 1287 * info's state because the structure could become invalid upon 1288 * return due to races (i.e., if async) 1289 */ 1290 crit_enter(); 1291 mtx_link_init(&rep->r_link); 1292 TAILQ_INSERT_TAIL(&nmp->nm_reqq, rep, r_chain); 1293 rep->r_flags |= R_ONREQQ; 1294 ++nmp->nm_reqqlen; 1295 if (rep->r_flags & R_ASYNC) 1296 rep->r_info->state = NFSM_STATE_WAITREPLY; 1297 crit_exit(); 1298 1299 error = 0; 1300 1301 /* 1302 * Send if we can. Congestion control is not handled here any more 1303 * becausing trying to defer the initial send based on the nfs_timer 1304 * requires having a very fast nfs_timer, which is silly. 1305 */ 1306 if (nmp->nm_so) { 1307 if (nmp->nm_soflags & PR_CONNREQUIRED) 1308 error = nfs_sndlock(nmp, rep); 1309 if (error == 0) { 1310 m2 = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); 1311 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); 1312 if (nmp->nm_soflags & PR_CONNREQUIRED) 1313 nfs_sndunlock(nmp); 1314 rep->r_flags &= ~R_NEEDSXMIT; 1315 if ((rep->r_flags & R_SENT) == 0) { 1316 rep->r_flags |= R_SENT; 1317 } 1318 } else { 1319 rep->r_flags |= R_NEEDSXMIT; 1320 } 1321 } else { 1322 rep->r_flags |= R_NEEDSXMIT; 1323 rep->r_rtt = -1; 1324 } 1325 if (error == EPIPE) 1326 error = 0; 1327 1328 /* 1329 * Release the lock. The only remote action that may have occurred 1330 * would have been the setting of rep->r_mrep. If this occured 1331 * and the request was async we have to move it to the reader 1332 * thread's queue for action. 1333 * 1334 * For async requests also make sure the reader is woken up so 1335 * it gets on the socket to read responses. 1336 */ 1337 crit_enter(); 1338 if (rep->r_flags & R_ASYNC) { 1339 if (rep->r_mrep) 1340 nfs_hardterm(rep, 1); 1341 rep->r_flags &= ~R_LOCKED; 1342 nfssvc_iod_reader_wakeup(nmp); 1343 } else { 1344 rep->r_flags &= ~R_LOCKED; 1345 } 1346 if (rep->r_flags & R_WANTED) { 1347 rep->r_flags &= ~R_WANTED; 1348 wakeup(rep); 1349 } 1350 crit_exit(); 1351 return (error); 1352 } 1353 1354 /* 1355 * This code is only called for synchronous requests. Completed synchronous 1356 * requests are left on reqq and we remove them before moving on to the 1357 * processing state. 1358 */ 1359 static int 1360 nfs_request_waitreply(struct nfsreq *rep) 1361 { 1362 struct nfsmount *nmp = rep->r_nmp; 1363 int error; 1364 1365 KKASSERT((rep->r_flags & R_ASYNC) == 0); 1366 1367 /* 1368 * Wait until the request is finished. 1369 */ 1370 error = nfs_reply(nmp, rep); 1371 1372 /* 1373 * RPC done, unlink the request, but don't rip it out from under 1374 * the callout timer. 1375 * 1376 * Once unlinked no other receiver or the timer will have 1377 * visibility, so we do not have to set R_LOCKED. 1378 */ 1379 crit_enter(); 1380 while (rep->r_flags & R_LOCKED) { 1381 rep->r_flags |= R_WANTED; 1382 tsleep(rep, 0, "nfstrac", 0); 1383 } 1384 KKASSERT(rep->r_flags & R_ONREQQ); 1385 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain); 1386 rep->r_flags &= ~R_ONREQQ; 1387 --nmp->nm_reqqlen; 1388 if (TAILQ_FIRST(&nmp->nm_bioq) && 1389 nmp->nm_reqqlen <= nfs_maxasyncbio * 2 / 3) { 1390 nfssvc_iod_writer_wakeup(nmp); 1391 } 1392 crit_exit(); 1393 1394 /* 1395 * Decrement the outstanding request count. 1396 */ 1397 if (rep->r_flags & R_SENT) { 1398 rep->r_flags &= ~R_SENT; 1399 } 1400 return (error); 1401 } 1402 1403 /* 1404 * Process reply with error returned from nfs_requet_waitreply(). 1405 * 1406 * Returns EAGAIN if it wants us to loop up to nfs_request_try() again. 1407 * Returns ENEEDAUTH if it wants us to loop up to nfs_request_auth() again. 1408 */ 1409 static int 1410 nfs_request_processreply(nfsm_info_t info, int error) 1411 { 1412 struct nfsreq *req = info->req; 1413 struct nfsmount *nmp = req->r_nmp; 1414 u_int32_t *tl; 1415 int verf_type; 1416 int i; 1417 1418 /* 1419 * If there was a successful reply and a tprintf msg. 1420 * tprintf a response. 1421 */ 1422 if (error == 0 && (req->r_flags & R_TPRINTFMSG)) { 1423 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1424 "is alive again"); 1425 } 1426 info->mrep = req->r_mrep; 1427 info->md = req->r_md; 1428 info->dpos = req->r_dpos; 1429 if (error) { 1430 m_freem(req->r_mreq); 1431 req->r_mreq = NULL; 1432 kfree(req, M_NFSREQ); 1433 info->req = NULL; 1434 return (error); 1435 } 1436 1437 /* 1438 * break down the rpc header and check if ok 1439 */ 1440 NULLOUT(tl = nfsm_dissect(info, 3 * NFSX_UNSIGNED)); 1441 if (*tl++ == rpc_msgdenied) { 1442 if (*tl == rpc_mismatch) { 1443 error = EOPNOTSUPP; 1444 } else if ((nmp->nm_flag & NFSMNT_KERB) && 1445 *tl++ == rpc_autherr) { 1446 if (req->r_failed_auth == 0) { 1447 req->r_failed_auth++; 1448 req->r_mheadend->m_next = NULL; 1449 m_freem(info->mrep); 1450 info->mrep = NULL; 1451 m_freem(req->r_mreq); 1452 req->r_mreq = NULL; 1453 return (ENEEDAUTH); 1454 } else { 1455 error = EAUTH; 1456 } 1457 } else { 1458 error = EACCES; 1459 } 1460 m_freem(info->mrep); 1461 info->mrep = NULL; 1462 m_freem(req->r_mreq); 1463 req->r_mreq = NULL; 1464 kfree(req, M_NFSREQ); 1465 info->req = NULL; 1466 return (error); 1467 } 1468 1469 /* 1470 * Grab any Kerberos verifier, otherwise just throw it away. 1471 */ 1472 verf_type = fxdr_unsigned(int, *tl++); 1473 i = fxdr_unsigned(int32_t, *tl); 1474 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1475 error = nfs_savenickauth(nmp, req->r_cred, i, req->r_key, 1476 &info->md, &info->dpos, info->mrep); 1477 if (error) 1478 goto nfsmout; 1479 } else if (i > 0) { 1480 ERROROUT(nfsm_adv(info, nfsm_rndup(i))); 1481 } 1482 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED)); 1483 /* 0 == ok */ 1484 if (*tl == 0) { 1485 NULLOUT(tl = nfsm_dissect(info, NFSX_UNSIGNED)); 1486 if (*tl != 0) { 1487 error = fxdr_unsigned(int, *tl); 1488 1489 /* 1490 * Does anyone even implement this? Just impose 1491 * a 1-second delay. 1492 */ 1493 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1494 error == NFSERR_TRYLATER) { 1495 m_freem(info->mrep); 1496 info->mrep = NULL; 1497 error = 0; 1498 1499 tsleep((caddr_t)&lbolt, 0, "nqnfstry", 0); 1500 return (EAGAIN); /* goto tryagain */ 1501 } 1502 1503 /* 1504 * If the File Handle was stale, invalidate the 1505 * lookup cache, just in case. 1506 * 1507 * To avoid namecache<->vnode deadlocks we must 1508 * release the vnode lock if we hold it. 1509 */ 1510 if (error == ESTALE) { 1511 struct vnode *vp = req->r_vp; 1512 int ltype; 1513 1514 ltype = lockstatus(&vp->v_lock, curthread); 1515 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1516 lockmgr(&vp->v_lock, LK_RELEASE); 1517 cache_inval_vp(vp, CINV_CHILDREN); 1518 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1519 lockmgr(&vp->v_lock, ltype); 1520 } 1521 if (nmp->nm_flag & NFSMNT_NFSV3) { 1522 KKASSERT(*req->r_mrp == info->mrep); 1523 KKASSERT(*req->r_mdp == info->md); 1524 KKASSERT(*req->r_dposp == info->dpos); 1525 error |= NFSERR_RETERR; 1526 } else { 1527 m_freem(info->mrep); 1528 info->mrep = NULL; 1529 } 1530 m_freem(req->r_mreq); 1531 req->r_mreq = NULL; 1532 kfree(req, M_NFSREQ); 1533 info->req = NULL; 1534 return (error); 1535 } 1536 1537 KKASSERT(*req->r_mrp == info->mrep); 1538 KKASSERT(*req->r_mdp == info->md); 1539 KKASSERT(*req->r_dposp == info->dpos); 1540 m_freem(req->r_mreq); 1541 req->r_mreq = NULL; 1542 FREE(req, M_NFSREQ); 1543 return (0); 1544 } 1545 m_freem(info->mrep); 1546 info->mrep = NULL; 1547 error = EPROTONOSUPPORT; 1548 nfsmout: 1549 m_freem(req->r_mreq); 1550 req->r_mreq = NULL; 1551 kfree(req, M_NFSREQ); 1552 info->req = NULL; 1553 return (error); 1554 } 1555 1556 #ifndef NFS_NOSERVER 1557 /* 1558 * Generate the rpc reply header 1559 * siz arg. is used to decide if adding a cluster is worthwhile 1560 */ 1561 int 1562 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, 1563 int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp) 1564 { 1565 u_int32_t *tl; 1566 struct nfsm_info info; 1567 1568 siz += RPC_REPLYSIZ; 1569 info.mb = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL); 1570 info.mreq = info.mb; 1571 info.mreq->m_pkthdr.len = 0; 1572 /* 1573 * If this is not a cluster, try and leave leading space 1574 * for the lower level headers. 1575 */ 1576 if ((max_hdr + siz) < MINCLSIZE) 1577 info.mreq->m_data += max_hdr; 1578 tl = mtod(info.mreq, u_int32_t *); 1579 info.mreq->m_len = 6 * NFSX_UNSIGNED; 1580 info.bpos = ((caddr_t)tl) + info.mreq->m_len; 1581 *tl++ = txdr_unsigned(nd->nd_retxid); 1582 *tl++ = rpc_reply; 1583 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1584 *tl++ = rpc_msgdenied; 1585 if (err & NFSERR_AUTHERR) { 1586 *tl++ = rpc_autherr; 1587 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1588 info.mreq->m_len -= NFSX_UNSIGNED; 1589 info.bpos -= NFSX_UNSIGNED; 1590 } else { 1591 *tl++ = rpc_mismatch; 1592 *tl++ = txdr_unsigned(RPC_VER2); 1593 *tl = txdr_unsigned(RPC_VER2); 1594 } 1595 } else { 1596 *tl++ = rpc_msgaccepted; 1597 1598 /* 1599 * For Kerberos authentication, we must send the nickname 1600 * verifier back, otherwise just RPCAUTH_NULL. 1601 */ 1602 if (nd->nd_flag & ND_KERBFULL) { 1603 struct nfsuid *nuidp; 1604 struct timeval ktvin, ktvout; 1605 1606 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1607 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1608 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1609 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1610 &nuidp->nu_haddr, nd->nd_nam2))) 1611 break; 1612 } 1613 if (nuidp) { 1614 ktvin.tv_sec = 1615 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1616 ktvin.tv_usec = 1617 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1618 1619 /* 1620 * Encrypt the timestamp in ecb mode using the 1621 * session key. 1622 */ 1623 #ifdef NFSKERB 1624 XXX 1625 #else 1626 ktvout.tv_sec = 0; 1627 ktvout.tv_usec = 0; 1628 #endif 1629 1630 *tl++ = rpc_auth_kerb; 1631 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1632 *tl = ktvout.tv_sec; 1633 tl = nfsm_build(&info, 3 * NFSX_UNSIGNED); 1634 *tl++ = ktvout.tv_usec; 1635 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1636 } else { 1637 *tl++ = 0; 1638 *tl++ = 0; 1639 } 1640 } else { 1641 *tl++ = 0; 1642 *tl++ = 0; 1643 } 1644 switch (err) { 1645 case EPROGUNAVAIL: 1646 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1647 break; 1648 case EPROGMISMATCH: 1649 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1650 tl = nfsm_build(&info, 2 * NFSX_UNSIGNED); 1651 *tl++ = txdr_unsigned(2); 1652 *tl = txdr_unsigned(3); 1653 break; 1654 case EPROCUNAVAIL: 1655 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1656 break; 1657 case EBADRPC: 1658 *tl = txdr_unsigned(RPC_GARBAGE); 1659 break; 1660 default: 1661 *tl = 0; 1662 if (err != NFSERR_RETVOID) { 1663 tl = nfsm_build(&info, NFSX_UNSIGNED); 1664 if (err) 1665 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1666 else 1667 *tl = 0; 1668 } 1669 break; 1670 }; 1671 } 1672 1673 if (mrq != NULL) 1674 *mrq = info.mreq; 1675 *mbp = info.mb; 1676 *bposp = info.bpos; 1677 if (err != 0 && err != NFSERR_RETVOID) 1678 nfsstats.srvrpc_errs++; 1679 return (0); 1680 } 1681 1682 1683 #endif /* NFS_NOSERVER */ 1684 1685 /* 1686 * Nfs timer routine. 1687 * 1688 * Scan the nfsreq list and retranmit any requests that have timed out 1689 * To avoid retransmission attempts on STREAM sockets (in the future) make 1690 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1691 * 1692 * Requests with attached responses, terminated requests, and 1693 * locked requests are ignored. Locked requests will be picked up 1694 * in a later timer call. 1695 */ 1696 void 1697 nfs_timer(void *arg /* never used */) 1698 { 1699 struct nfsmount *nmp; 1700 struct nfsreq *req; 1701 #ifndef NFS_NOSERVER 1702 struct nfssvc_sock *slp; 1703 u_quad_t cur_usec; 1704 #endif /* NFS_NOSERVER */ 1705 1706 crit_enter(); 1707 TAILQ_FOREACH(nmp, &nfs_mountq, nm_entry) { 1708 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1709 KKASSERT(nmp == req->r_nmp); 1710 if (req->r_mrep) 1711 continue; 1712 if (req->r_flags & (R_SOFTTERM | R_LOCKED)) 1713 continue; 1714 req->r_flags |= R_LOCKED; 1715 if (nfs_sigintr(nmp, req, req->r_td)) { 1716 nfs_softterm(req, 1); 1717 } else { 1718 nfs_timer_req(req); 1719 } 1720 req->r_flags &= ~R_LOCKED; 1721 if (req->r_flags & R_WANTED) { 1722 req->r_flags &= ~R_WANTED; 1723 wakeup(req); 1724 } 1725 } 1726 } 1727 #ifndef NFS_NOSERVER 1728 1729 /* 1730 * Scan the write gathering queues for writes that need to be 1731 * completed now. 1732 */ 1733 cur_usec = nfs_curusec(); 1734 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1735 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) 1736 nfsrv_wakenfsd(slp, 1); 1737 } 1738 #endif /* NFS_NOSERVER */ 1739 crit_exit(); 1740 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL); 1741 } 1742 1743 static 1744 void 1745 nfs_timer_req(struct nfsreq *req) 1746 { 1747 struct thread *td = &thread0; /* XXX for creds, will break if sleep */ 1748 struct nfsmount *nmp = req->r_nmp; 1749 struct mbuf *m; 1750 struct socket *so; 1751 int timeo; 1752 int error; 1753 1754 /* 1755 * rtt ticks and timeout calculation. Return if the timeout 1756 * has not been reached yet, unless the packet is flagged 1757 * for an immediate send. 1758 * 1759 * The mean rtt doesn't help when we get random I/Os, we have 1760 * to multiply by fairly large numbers. 1761 */ 1762 if (req->r_rtt >= 0) { 1763 /* 1764 * Calculate the timeout to test against. 1765 */ 1766 req->r_rtt++; 1767 if (nmp->nm_flag & NFSMNT_DUMBTIMR) { 1768 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS; 1769 } else if (req->r_flags & R_TIMING) { 1770 timeo = NFS_SRTT(req) + NFS_SDRTT(req); 1771 } else { 1772 timeo = nmp->nm_timeo << NFS_RTT_SCALE_BITS; 1773 } 1774 timeo *= multt[req->r_procnum]; 1775 /* timeo is still scaled by SCALE_BITS */ 1776 1777 #define NFSFS (NFS_RTT_SCALE * NFS_HZ) 1778 if (req->r_flags & R_TIMING) { 1779 static long last_time; 1780 if (nfs_showrtt && last_time != time_second) { 1781 kprintf("rpccmd %d NFS SRTT %d SDRTT %d " 1782 "timeo %d.%03d\n", 1783 proct[req->r_procnum], 1784 NFS_SRTT(req), NFS_SDRTT(req), 1785 timeo / NFSFS, 1786 timeo % NFSFS * 1000 / NFSFS); 1787 last_time = time_second; 1788 } 1789 } 1790 #undef NFSFS 1791 1792 /* 1793 * deal with nfs_timer jitter. 1794 */ 1795 timeo = (timeo >> NFS_RTT_SCALE_BITS) + 1; 1796 if (timeo < 2) 1797 timeo = 2; 1798 1799 if (nmp->nm_timeouts > 0) 1800 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1801 if (timeo > NFS_MAXTIMEO) 1802 timeo = NFS_MAXTIMEO; 1803 if (req->r_rtt <= timeo) { 1804 if ((req->r_flags & R_NEEDSXMIT) == 0) 1805 return; 1806 } else if (nmp->nm_timeouts < 8) { 1807 nmp->nm_timeouts++; 1808 } 1809 } 1810 1811 /* 1812 * Check for server not responding 1813 */ 1814 if ((req->r_flags & R_TPRINTFMSG) == 0 && 1815 req->r_rexmit > nmp->nm_deadthresh) { 1816 nfs_msg(req->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1817 "not responding"); 1818 req->r_flags |= R_TPRINTFMSG; 1819 } 1820 if (req->r_rexmit >= req->r_retry) { /* too many */ 1821 nfsstats.rpctimeouts++; 1822 nfs_softterm(req, 1); 1823 return; 1824 } 1825 1826 /* 1827 * Generally disable retransmission on reliable sockets, 1828 * unless the request is flagged for immediate send. 1829 */ 1830 if (nmp->nm_sotype != SOCK_DGRAM) { 1831 if (++req->r_rexmit > NFS_MAXREXMIT) 1832 req->r_rexmit = NFS_MAXREXMIT; 1833 if ((req->r_flags & R_NEEDSXMIT) == 0) 1834 return; 1835 } 1836 1837 /* 1838 * Stop here if we do not have a socket! 1839 */ 1840 if ((so = nmp->nm_so) == NULL) 1841 return; 1842 1843 /* 1844 * If there is enough space and the window allows.. resend it. 1845 * 1846 * r_rtt is left intact in case we get an answer after the 1847 * retry that was a reply to the original packet. 1848 * 1849 * NOTE: so_pru_send() 1850 */ 1851 if (ssb_space(&so->so_snd) >= req->r_mreq->m_pkthdr.len && 1852 (req->r_flags & (R_SENT | R_NEEDSXMIT)) && 1853 (m = m_copym(req->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){ 1854 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1855 error = so_pru_send(so, 0, m, NULL, NULL, td); 1856 else 1857 error = so_pru_send(so, 0, m, nmp->nm_nam, NULL, td); 1858 if (error) { 1859 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1860 so->so_error = 0; 1861 req->r_flags |= R_NEEDSXMIT; 1862 } else if (req->r_mrep == NULL) { 1863 /* 1864 * Iff first send, start timing 1865 * else turn timing off, backoff timer 1866 * and divide congestion window by 2. 1867 * 1868 * It is possible for the so_pru_send() to 1869 * block and for us to race a reply so we 1870 * only do this if the reply field has not 1871 * been filled in. R_LOCKED will prevent 1872 * the request from being ripped out from under 1873 * us entirely. 1874 * 1875 * Record the last resent procnum to aid us 1876 * in duplicate detection on receive. 1877 */ 1878 if ((req->r_flags & R_NEEDSXMIT) == 0) { 1879 if (nfs_showrexmit) 1880 kprintf("X"); 1881 if (++req->r_rexmit > NFS_MAXREXMIT) 1882 req->r_rexmit = NFS_MAXREXMIT; 1883 nmp->nm_maxasync_scaled >>= 1; 1884 if (nmp->nm_maxasync_scaled < NFS_MINASYNC_SCALED) 1885 nmp->nm_maxasync_scaled = NFS_MINASYNC_SCALED; 1886 nfsstats.rpcretries++; 1887 nmp->nm_lastreprocnum = req->r_procnum; 1888 } else { 1889 req->r_flags |= R_SENT; 1890 req->r_flags &= ~R_NEEDSXMIT; 1891 } 1892 } 1893 } 1894 } 1895 1896 /* 1897 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1898 * wait for all requests to complete. This is used by forced unmounts 1899 * to terminate any outstanding RPCs. 1900 * 1901 * Locked requests cannot be canceled but will be marked for 1902 * soft-termination. 1903 */ 1904 int 1905 nfs_nmcancelreqs(struct nfsmount *nmp) 1906 { 1907 struct nfsreq *req; 1908 int i; 1909 1910 crit_enter(); 1911 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1912 if (req->r_mrep != NULL || (req->r_flags & R_SOFTTERM)) 1913 continue; 1914 nfs_softterm(req, 0); 1915 } 1916 /* XXX the other two queues as well */ 1917 crit_exit(); 1918 1919 for (i = 0; i < 30; i++) { 1920 crit_enter(); 1921 TAILQ_FOREACH(req, &nmp->nm_reqq, r_chain) { 1922 if (nmp == req->r_nmp) 1923 break; 1924 } 1925 crit_exit(); 1926 if (req == NULL) 1927 return (0); 1928 tsleep(&lbolt, 0, "nfscancel", 0); 1929 } 1930 return (EBUSY); 1931 } 1932 1933 /* 1934 * Soft-terminate a request, effectively marking it as failed. 1935 * 1936 * Must be called from within a critical section. 1937 */ 1938 static void 1939 nfs_softterm(struct nfsreq *rep, int islocked) 1940 { 1941 rep->r_flags |= R_SOFTTERM; 1942 nfs_hardterm(rep, islocked); 1943 } 1944 1945 /* 1946 * Hard-terminate a request, typically after getting a response. 1947 * 1948 * The state machine can still decide to re-issue it later if necessary. 1949 * 1950 * Must be called from within a critical section. 1951 */ 1952 static void 1953 nfs_hardterm(struct nfsreq *rep, int islocked) 1954 { 1955 struct nfsmount *nmp = rep->r_nmp; 1956 1957 /* 1958 * The nm_send count is decremented now to avoid deadlocks 1959 * when the process in soreceive() hasn't yet managed to send 1960 * its own request. 1961 */ 1962 if (rep->r_flags & R_SENT) { 1963 rep->r_flags &= ~R_SENT; 1964 } 1965 1966 /* 1967 * If we locked the request or nobody else has locked the request, 1968 * and the request is async, we can move it to the reader thread's 1969 * queue now and fix up the state. 1970 * 1971 * If we locked the request or nobody else has locked the request, 1972 * we can wake up anyone blocked waiting for a response on the 1973 * request. 1974 */ 1975 if (islocked || (rep->r_flags & R_LOCKED) == 0) { 1976 if ((rep->r_flags & (R_ONREQQ | R_ASYNC)) == 1977 (R_ONREQQ | R_ASYNC)) { 1978 rep->r_flags &= ~R_ONREQQ; 1979 TAILQ_REMOVE(&nmp->nm_reqq, rep, r_chain); 1980 --nmp->nm_reqqlen; 1981 TAILQ_INSERT_TAIL(&nmp->nm_reqrxq, rep, r_chain); 1982 KKASSERT(rep->r_info->state == NFSM_STATE_TRY || 1983 rep->r_info->state == NFSM_STATE_WAITREPLY); 1984 rep->r_info->state = NFSM_STATE_PROCESSREPLY; 1985 nfssvc_iod_reader_wakeup(nmp); 1986 if (TAILQ_FIRST(&nmp->nm_bioq) && 1987 nmp->nm_reqqlen <= nfs_maxasyncbio * 2 / 3) { 1988 nfssvc_iod_writer_wakeup(nmp); 1989 } 1990 } 1991 mtx_abort_ex_link(&nmp->nm_rxlock, &rep->r_link); 1992 } 1993 } 1994 1995 /* 1996 * Test for a termination condition pending on the process. 1997 * This is used for NFSMNT_INT mounts. 1998 */ 1999 int 2000 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td) 2001 { 2002 sigset_t tmpset; 2003 struct proc *p; 2004 struct lwp *lp; 2005 2006 if (rep && (rep->r_flags & R_SOFTTERM)) 2007 return (EINTR); 2008 /* Terminate all requests while attempting a forced unmount. */ 2009 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) 2010 return (EINTR); 2011 if (!(nmp->nm_flag & NFSMNT_INT)) 2012 return (0); 2013 /* td might be NULL YYY */ 2014 if (td == NULL || (p = td->td_proc) == NULL) 2015 return (0); 2016 2017 lp = td->td_lwp; 2018 tmpset = lwp_sigpend(lp); 2019 SIGSETNAND(tmpset, lp->lwp_sigmask); 2020 SIGSETNAND(tmpset, p->p_sigignore); 2021 if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset)) 2022 return (EINTR); 2023 2024 return (0); 2025 } 2026 2027 /* 2028 * Lock a socket against others. 2029 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 2030 * and also to avoid race conditions between the processes with nfs requests 2031 * in progress when a reconnect is necessary. 2032 */ 2033 int 2034 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) 2035 { 2036 mtx_t mtx = &nmp->nm_txlock; 2037 struct thread *td; 2038 int slptimeo; 2039 int slpflag; 2040 int error; 2041 2042 slpflag = 0; 2043 slptimeo = 0; 2044 td = rep ? rep->r_td : NULL; 2045 if (nmp->nm_flag & NFSMNT_INT) 2046 slpflag = PCATCH; 2047 2048 while ((error = mtx_lock_ex_try(mtx)) != 0) { 2049 if (nfs_sigintr(nmp, rep, td)) { 2050 error = EINTR; 2051 break; 2052 } 2053 error = mtx_lock_ex(mtx, "nfsndlck", slpflag, slptimeo); 2054 if (error == 0) 2055 break; 2056 if (slpflag == PCATCH) { 2057 slpflag = 0; 2058 slptimeo = 2 * hz; 2059 } 2060 } 2061 /* Always fail if our request has been cancelled. */ 2062 if (rep && (rep->r_flags & R_SOFTTERM)) { 2063 if (error == 0) 2064 mtx_unlock(mtx); 2065 error = EINTR; 2066 } 2067 return (error); 2068 } 2069 2070 /* 2071 * Unlock the stream socket for others. 2072 */ 2073 void 2074 nfs_sndunlock(struct nfsmount *nmp) 2075 { 2076 mtx_unlock(&nmp->nm_txlock); 2077 } 2078 2079 /* 2080 * Lock the receiver side of the socket. 2081 * 2082 * rep may be NULL. 2083 */ 2084 static int 2085 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep) 2086 { 2087 mtx_t mtx = &nmp->nm_rxlock; 2088 int slpflag; 2089 int slptimeo; 2090 int error; 2091 2092 /* 2093 * Unconditionally check for completion in case another nfsiod 2094 * get the packet while the caller was blocked, before the caller 2095 * called us. Packet reception is handled by mainline code which 2096 * is protected by the BGL at the moment. 2097 * 2098 * We do not strictly need the second check just before the 2099 * tsleep(), but it's good defensive programming. 2100 */ 2101 if (rep && rep->r_mrep != NULL) 2102 return (EALREADY); 2103 2104 if (nmp->nm_flag & NFSMNT_INT) 2105 slpflag = PCATCH; 2106 else 2107 slpflag = 0; 2108 slptimeo = 0; 2109 2110 while ((error = mtx_lock_ex_try(mtx)) != 0) { 2111 if (nfs_sigintr(nmp, rep, (rep ? rep->r_td : NULL))) { 2112 error = EINTR; 2113 break; 2114 } 2115 if (rep && rep->r_mrep != NULL) { 2116 error = EALREADY; 2117 break; 2118 } 2119 2120 /* 2121 * NOTE: can return ENOLCK, but in that case rep->r_mrep 2122 * will already be set. 2123 */ 2124 if (rep) { 2125 error = mtx_lock_ex_link(mtx, &rep->r_link, 2126 "nfsrcvlk", 2127 slpflag, slptimeo); 2128 } else { 2129 error = mtx_lock_ex(mtx, "nfsrcvlk", slpflag, slptimeo); 2130 } 2131 if (error == 0) 2132 break; 2133 2134 /* 2135 * If our reply was recieved while we were sleeping, 2136 * then just return without taking the lock to avoid a 2137 * situation where a single iod could 'capture' the 2138 * recieve lock. 2139 */ 2140 if (rep && rep->r_mrep != NULL) { 2141 error = EALREADY; 2142 break; 2143 } 2144 if (slpflag == PCATCH) { 2145 slpflag = 0; 2146 slptimeo = 2 * hz; 2147 } 2148 } 2149 if (error == 0) { 2150 if (rep && rep->r_mrep != NULL) { 2151 error = EALREADY; 2152 mtx_unlock(mtx); 2153 } 2154 } 2155 return (error); 2156 } 2157 2158 /* 2159 * Unlock the stream socket for others. 2160 */ 2161 static void 2162 nfs_rcvunlock(struct nfsmount *nmp) 2163 { 2164 mtx_unlock(&nmp->nm_rxlock); 2165 } 2166 2167 /* 2168 * nfs_realign: 2169 * 2170 * Check for badly aligned mbuf data and realign by copying the unaligned 2171 * portion of the data into a new mbuf chain and freeing the portions 2172 * of the old chain that were replaced. 2173 * 2174 * We cannot simply realign the data within the existing mbuf chain 2175 * because the underlying buffers may contain other rpc commands and 2176 * we cannot afford to overwrite them. 2177 * 2178 * We would prefer to avoid this situation entirely. The situation does 2179 * not occur with NFS/UDP and is supposed to only occassionally occur 2180 * with TCP. Use vfs.nfs.realign_count and realign_test to check this. 2181 * 2182 * NOTE! MB_DONTWAIT cannot be used here. The mbufs must be acquired 2183 * because the rpc request OR reply cannot be thrown away. TCP NFS 2184 * mounts do not retry their RPCs unless the TCP connection itself 2185 * is dropped so throwing away a RPC will basically cause the NFS 2186 * operation to lockup indefinitely. 2187 */ 2188 static void 2189 nfs_realign(struct mbuf **pm, int hsiz) 2190 { 2191 struct mbuf *m; 2192 struct mbuf *n = NULL; 2193 2194 /* 2195 * Check for misalignemnt 2196 */ 2197 ++nfs_realign_test; 2198 while ((m = *pm) != NULL) { 2199 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) 2200 break; 2201 pm = &m->m_next; 2202 } 2203 2204 /* 2205 * If misalignment found make a completely new copy. 2206 */ 2207 if (m) { 2208 ++nfs_realign_count; 2209 n = m_dup_data(m, MB_WAIT); 2210 m_freem(*pm); 2211 *pm = n; 2212 } 2213 } 2214 2215 #ifndef NFS_NOSERVER 2216 2217 /* 2218 * Parse an RPC request 2219 * - verify it 2220 * - fill in the cred struct. 2221 */ 2222 int 2223 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 2224 { 2225 int len, i; 2226 u_int32_t *tl; 2227 struct uio uio; 2228 struct iovec iov; 2229 caddr_t cp; 2230 u_int32_t nfsvers, auth_type; 2231 uid_t nickuid; 2232 int error = 0, ticklen; 2233 struct nfsuid *nuidp; 2234 struct timeval tvin, tvout; 2235 struct nfsm_info info; 2236 #if 0 /* until encrypted keys are implemented */ 2237 NFSKERBKEYSCHED_T keys; /* stores key schedule */ 2238 #endif 2239 2240 info.mrep = nd->nd_mrep; 2241 info.md = nd->nd_md; 2242 info.dpos = nd->nd_dpos; 2243 2244 if (has_header) { 2245 NULLOUT(tl = nfsm_dissect(&info, 10 * NFSX_UNSIGNED)); 2246 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 2247 if (*tl++ != rpc_call) { 2248 m_freem(info.mrep); 2249 return (EBADRPC); 2250 } 2251 } else { 2252 NULLOUT(tl = nfsm_dissect(&info, 8 * NFSX_UNSIGNED)); 2253 } 2254 nd->nd_repstat = 0; 2255 nd->nd_flag = 0; 2256 if (*tl++ != rpc_vers) { 2257 nd->nd_repstat = ERPCMISMATCH; 2258 nd->nd_procnum = NFSPROC_NOOP; 2259 return (0); 2260 } 2261 if (*tl != nfs_prog) { 2262 nd->nd_repstat = EPROGUNAVAIL; 2263 nd->nd_procnum = NFSPROC_NOOP; 2264 return (0); 2265 } 2266 tl++; 2267 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 2268 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 2269 nd->nd_repstat = EPROGMISMATCH; 2270 nd->nd_procnum = NFSPROC_NOOP; 2271 return (0); 2272 } 2273 if (nfsvers == NFS_VER3) 2274 nd->nd_flag = ND_NFSV3; 2275 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 2276 if (nd->nd_procnum == NFSPROC_NULL) 2277 return (0); 2278 if (nd->nd_procnum >= NFS_NPROCS || 2279 (nd->nd_procnum >= NQNFSPROC_GETLEASE) || 2280 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 2281 nd->nd_repstat = EPROCUNAVAIL; 2282 nd->nd_procnum = NFSPROC_NOOP; 2283 return (0); 2284 } 2285 if ((nd->nd_flag & ND_NFSV3) == 0) 2286 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 2287 auth_type = *tl++; 2288 len = fxdr_unsigned(int, *tl++); 2289 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2290 m_freem(info.mrep); 2291 return (EBADRPC); 2292 } 2293 2294 nd->nd_flag &= ~ND_KERBAUTH; 2295 /* 2296 * Handle auth_unix or auth_kerb. 2297 */ 2298 if (auth_type == rpc_auth_unix) { 2299 len = fxdr_unsigned(int, *++tl); 2300 if (len < 0 || len > NFS_MAXNAMLEN) { 2301 m_freem(info.mrep); 2302 return (EBADRPC); 2303 } 2304 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2305 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2306 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 2307 nd->nd_cr.cr_ref = 1; 2308 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 2309 nd->nd_cr.cr_ruid = nd->nd_cr.cr_svuid = nd->nd_cr.cr_uid; 2310 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 2311 nd->nd_cr.cr_rgid = nd->nd_cr.cr_svgid = nd->nd_cr.cr_gid; 2312 len = fxdr_unsigned(int, *tl); 2313 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2314 m_freem(info.mrep); 2315 return (EBADRPC); 2316 } 2317 NULLOUT(tl = nfsm_dissect(&info, (len + 2) * NFSX_UNSIGNED)); 2318 for (i = 1; i <= len; i++) 2319 if (i < NGROUPS) 2320 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 2321 else 2322 tl++; 2323 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 2324 if (nd->nd_cr.cr_ngroups > 1) 2325 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 2326 len = fxdr_unsigned(int, *++tl); 2327 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2328 m_freem(info.mrep); 2329 return (EBADRPC); 2330 } 2331 if (len > 0) { 2332 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 2333 } 2334 } else if (auth_type == rpc_auth_kerb) { 2335 switch (fxdr_unsigned(int, *tl++)) { 2336 case RPCAKN_FULLNAME: 2337 ticklen = fxdr_unsigned(int, *tl); 2338 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2339 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2340 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2341 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2342 m_freem(info.mrep); 2343 return (EBADRPC); 2344 } 2345 uio.uio_offset = 0; 2346 uio.uio_iov = &iov; 2347 uio.uio_iovcnt = 1; 2348 uio.uio_segflg = UIO_SYSSPACE; 2349 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 2350 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2351 ERROROUT(nfsm_mtouio(&info, &uio, uio.uio_resid)); 2352 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2353 if (*tl++ != rpc_auth_kerb || 2354 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2355 kprintf("Bad kerb verifier\n"); 2356 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2357 nd->nd_procnum = NFSPROC_NOOP; 2358 return (0); 2359 } 2360 NULLOUT(cp = nfsm_dissect(&info, 4 * NFSX_UNSIGNED)); 2361 tl = (u_int32_t *)cp; 2362 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2363 kprintf("Not fullname kerb verifier\n"); 2364 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2365 nd->nd_procnum = NFSPROC_NOOP; 2366 return (0); 2367 } 2368 cp += NFSX_UNSIGNED; 2369 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 2370 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2371 nd->nd_flag |= ND_KERBFULL; 2372 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2373 break; 2374 case RPCAKN_NICKNAME: 2375 if (len != 2 * NFSX_UNSIGNED) { 2376 kprintf("Kerb nickname short\n"); 2377 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2378 nd->nd_procnum = NFSPROC_NOOP; 2379 return (0); 2380 } 2381 nickuid = fxdr_unsigned(uid_t, *tl); 2382 NULLOUT(tl = nfsm_dissect(&info, 2 * NFSX_UNSIGNED)); 2383 if (*tl++ != rpc_auth_kerb || 2384 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2385 kprintf("Kerb nick verifier bad\n"); 2386 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2387 nd->nd_procnum = NFSPROC_NOOP; 2388 return (0); 2389 } 2390 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 2391 tvin.tv_sec = *tl++; 2392 tvin.tv_usec = *tl; 2393 2394 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 2395 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 2396 if (nuidp->nu_cr.cr_uid == nickuid && 2397 (!nd->nd_nam2 || 2398 netaddr_match(NU_NETFAM(nuidp), 2399 &nuidp->nu_haddr, nd->nd_nam2))) 2400 break; 2401 } 2402 if (!nuidp) { 2403 nd->nd_repstat = 2404 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2405 nd->nd_procnum = NFSPROC_NOOP; 2406 return (0); 2407 } 2408 2409 /* 2410 * Now, decrypt the timestamp using the session key 2411 * and validate it. 2412 */ 2413 #ifdef NFSKERB 2414 XXX 2415 #else 2416 tvout.tv_sec = 0; 2417 tvout.tv_usec = 0; 2418 #endif 2419 2420 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2421 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2422 if (nuidp->nu_expire < time_second || 2423 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2424 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2425 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2426 nuidp->nu_expire = 0; 2427 nd->nd_repstat = 2428 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2429 nd->nd_procnum = NFSPROC_NOOP; 2430 return (0); 2431 } 2432 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 2433 nd->nd_flag |= ND_KERBNICK; 2434 }; 2435 } else { 2436 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2437 nd->nd_procnum = NFSPROC_NOOP; 2438 return (0); 2439 } 2440 2441 nd->nd_md = info.md; 2442 nd->nd_dpos = info.dpos; 2443 return (0); 2444 nfsmout: 2445 return (error); 2446 } 2447 2448 #endif 2449 2450 /* 2451 * Send a message to the originating process's terminal. The thread and/or 2452 * process may be NULL. YYY the thread should not be NULL but there may 2453 * still be some uio_td's that are still being passed as NULL through to 2454 * nfsm_request(). 2455 */ 2456 static int 2457 nfs_msg(struct thread *td, char *server, char *msg) 2458 { 2459 tpr_t tpr; 2460 2461 if (td && td->td_proc) 2462 tpr = tprintf_open(td->td_proc); 2463 else 2464 tpr = NULL; 2465 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2466 tprintf_close(tpr); 2467 return (0); 2468 } 2469 2470 #ifndef NFS_NOSERVER 2471 /* 2472 * Socket upcall routine for the nfsd sockets. 2473 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2474 * Essentially do as much as possible non-blocking, else punt and it will 2475 * be called with MB_WAIT from an nfsd. 2476 */ 2477 void 2478 nfsrv_rcv(struct socket *so, void *arg, int waitflag) 2479 { 2480 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2481 struct mbuf *m; 2482 struct sockaddr *nam; 2483 struct sockbuf sio; 2484 int flags, error; 2485 int nparallel_wakeup = 0; 2486 2487 if ((slp->ns_flag & SLP_VALID) == 0) 2488 return; 2489 2490 /* 2491 * Do not allow an infinite number of completed RPC records to build 2492 * up before we stop reading data from the socket. Otherwise we could 2493 * end up holding onto an unreasonable number of mbufs for requests 2494 * waiting for service. 2495 * 2496 * This should give pretty good feedback to the TCP 2497 * layer and prevents a memory crunch for other protocols. 2498 * 2499 * Note that the same service socket can be dispatched to several 2500 * nfs servers simultaniously. 2501 * 2502 * the tcp protocol callback calls us with MB_DONTWAIT. 2503 * nfsd calls us with MB_WAIT (typically). 2504 */ 2505 if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) { 2506 slp->ns_flag |= SLP_NEEDQ; 2507 goto dorecs; 2508 } 2509 2510 /* 2511 * Handle protocol specifics to parse an RPC request. We always 2512 * pull from the socket using non-blocking I/O. 2513 */ 2514 if (so->so_type == SOCK_STREAM) { 2515 /* 2516 * The data has to be read in an orderly fashion from a TCP 2517 * stream, unlike a UDP socket. It is possible for soreceive 2518 * and/or nfsrv_getstream() to block, so make sure only one 2519 * entity is messing around with the TCP stream at any given 2520 * moment. The receive sockbuf's lock in soreceive is not 2521 * sufficient. 2522 * 2523 * Note that this procedure can be called from any number of 2524 * NFS severs *OR* can be upcalled directly from a TCP 2525 * protocol thread. 2526 */ 2527 if (slp->ns_flag & SLP_GETSTREAM) { 2528 slp->ns_flag |= SLP_NEEDQ; 2529 goto dorecs; 2530 } 2531 slp->ns_flag |= SLP_GETSTREAM; 2532 2533 /* 2534 * Do soreceive(). Pull out as much data as possible without 2535 * blocking. 2536 */ 2537 sbinit(&sio, 1000000000); 2538 flags = MSG_DONTWAIT; 2539 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags); 2540 if (error || sio.sb_mb == NULL) { 2541 if (error == EWOULDBLOCK) 2542 slp->ns_flag |= SLP_NEEDQ; 2543 else 2544 slp->ns_flag |= SLP_DISCONN; 2545 slp->ns_flag &= ~SLP_GETSTREAM; 2546 goto dorecs; 2547 } 2548 m = sio.sb_mb; 2549 if (slp->ns_rawend) { 2550 slp->ns_rawend->m_next = m; 2551 slp->ns_cc += sio.sb_cc; 2552 } else { 2553 slp->ns_raw = m; 2554 slp->ns_cc = sio.sb_cc; 2555 } 2556 while (m->m_next) 2557 m = m->m_next; 2558 slp->ns_rawend = m; 2559 2560 /* 2561 * Now try and parse as many record(s) as we can out of the 2562 * raw stream data. 2563 */ 2564 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup); 2565 if (error) { 2566 if (error == EPERM) 2567 slp->ns_flag |= SLP_DISCONN; 2568 else 2569 slp->ns_flag |= SLP_NEEDQ; 2570 } 2571 slp->ns_flag &= ~SLP_GETSTREAM; 2572 } else { 2573 /* 2574 * For UDP soreceive typically pulls just one packet, loop 2575 * to get the whole batch. 2576 */ 2577 do { 2578 sbinit(&sio, 1000000000); 2579 flags = MSG_DONTWAIT; 2580 error = so_pru_soreceive(so, &nam, NULL, &sio, 2581 NULL, &flags); 2582 if (sio.sb_mb) { 2583 struct nfsrv_rec *rec; 2584 int mf = (waitflag & MB_DONTWAIT) ? 2585 M_NOWAIT : M_WAITOK; 2586 rec = kmalloc(sizeof(struct nfsrv_rec), 2587 M_NFSRVDESC, mf); 2588 if (!rec) { 2589 if (nam) 2590 FREE(nam, M_SONAME); 2591 m_freem(sio.sb_mb); 2592 continue; 2593 } 2594 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED); 2595 rec->nr_address = nam; 2596 rec->nr_packet = sio.sb_mb; 2597 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2598 ++slp->ns_numrec; 2599 ++nparallel_wakeup; 2600 } 2601 if (error) { 2602 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2603 && error != EWOULDBLOCK) { 2604 slp->ns_flag |= SLP_DISCONN; 2605 goto dorecs; 2606 } 2607 } 2608 } while (sio.sb_mb); 2609 } 2610 2611 /* 2612 * If we were upcalled from the tcp protocol layer and we have 2613 * fully parsed records ready to go, or there is new data pending, 2614 * or something went wrong, try to wake up an nfsd thread to deal 2615 * with it. 2616 */ 2617 dorecs: 2618 if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0 2619 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) { 2620 nfsrv_wakenfsd(slp, nparallel_wakeup); 2621 } 2622 } 2623 2624 /* 2625 * Try and extract an RPC request from the mbuf data list received on a 2626 * stream socket. The "waitflag" argument indicates whether or not it 2627 * can sleep. 2628 */ 2629 static int 2630 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp) 2631 { 2632 struct mbuf *m, **mpp; 2633 char *cp1, *cp2; 2634 int len; 2635 struct mbuf *om, *m2, *recm; 2636 u_int32_t recmark; 2637 2638 for (;;) { 2639 if (slp->ns_reclen == 0) { 2640 if (slp->ns_cc < NFSX_UNSIGNED) 2641 return (0); 2642 m = slp->ns_raw; 2643 if (m->m_len >= NFSX_UNSIGNED) { 2644 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 2645 m->m_data += NFSX_UNSIGNED; 2646 m->m_len -= NFSX_UNSIGNED; 2647 } else { 2648 cp1 = (caddr_t)&recmark; 2649 cp2 = mtod(m, caddr_t); 2650 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2651 while (m->m_len == 0) { 2652 m = m->m_next; 2653 cp2 = mtod(m, caddr_t); 2654 } 2655 *cp1++ = *cp2++; 2656 m->m_data++; 2657 m->m_len--; 2658 } 2659 } 2660 slp->ns_cc -= NFSX_UNSIGNED; 2661 recmark = ntohl(recmark); 2662 slp->ns_reclen = recmark & ~0x80000000; 2663 if (recmark & 0x80000000) 2664 slp->ns_flag |= SLP_LASTFRAG; 2665 else 2666 slp->ns_flag &= ~SLP_LASTFRAG; 2667 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) { 2668 log(LOG_ERR, "%s (%d) from nfs client\n", 2669 "impossible packet length", 2670 slp->ns_reclen); 2671 return (EPERM); 2672 } 2673 } 2674 2675 /* 2676 * Now get the record part. 2677 * 2678 * Note that slp->ns_reclen may be 0. Linux sometimes 2679 * generates 0-length RPCs 2680 */ 2681 recm = NULL; 2682 if (slp->ns_cc == slp->ns_reclen) { 2683 recm = slp->ns_raw; 2684 slp->ns_raw = slp->ns_rawend = NULL; 2685 slp->ns_cc = slp->ns_reclen = 0; 2686 } else if (slp->ns_cc > slp->ns_reclen) { 2687 len = 0; 2688 m = slp->ns_raw; 2689 om = NULL; 2690 2691 while (len < slp->ns_reclen) { 2692 if ((len + m->m_len) > slp->ns_reclen) { 2693 m2 = m_copym(m, 0, slp->ns_reclen - len, 2694 waitflag); 2695 if (m2) { 2696 if (om) { 2697 om->m_next = m2; 2698 recm = slp->ns_raw; 2699 } else 2700 recm = m2; 2701 m->m_data += slp->ns_reclen - len; 2702 m->m_len -= slp->ns_reclen - len; 2703 len = slp->ns_reclen; 2704 } else { 2705 return (EWOULDBLOCK); 2706 } 2707 } else if ((len + m->m_len) == slp->ns_reclen) { 2708 om = m; 2709 len += m->m_len; 2710 m = m->m_next; 2711 recm = slp->ns_raw; 2712 om->m_next = NULL; 2713 } else { 2714 om = m; 2715 len += m->m_len; 2716 m = m->m_next; 2717 } 2718 } 2719 slp->ns_raw = m; 2720 slp->ns_cc -= len; 2721 slp->ns_reclen = 0; 2722 } else { 2723 return (0); 2724 } 2725 2726 /* 2727 * Accumulate the fragments into a record. 2728 */ 2729 mpp = &slp->ns_frag; 2730 while (*mpp) 2731 mpp = &((*mpp)->m_next); 2732 *mpp = recm; 2733 if (slp->ns_flag & SLP_LASTFRAG) { 2734 struct nfsrv_rec *rec; 2735 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK; 2736 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf); 2737 if (!rec) { 2738 m_freem(slp->ns_frag); 2739 } else { 2740 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); 2741 rec->nr_address = NULL; 2742 rec->nr_packet = slp->ns_frag; 2743 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2744 ++slp->ns_numrec; 2745 ++*countp; 2746 } 2747 slp->ns_frag = NULL; 2748 } 2749 } 2750 } 2751 2752 #ifdef INVARIANTS 2753 2754 /* 2755 * Sanity check our mbuf chain. 2756 */ 2757 static void 2758 nfs_checkpkt(struct mbuf *m, int len) 2759 { 2760 int xlen = 0; 2761 while (m) { 2762 xlen += m->m_len; 2763 m = m->m_next; 2764 } 2765 if (xlen != len) { 2766 panic("nfs_checkpkt: len mismatch %d/%d mbuf %p\n", 2767 xlen, len, m); 2768 } 2769 } 2770 2771 #else 2772 2773 static void 2774 nfs_checkpkt(struct mbuf *m __unused, int len __unused) 2775 { 2776 } 2777 2778 #endif 2779 2780 /* 2781 * Parse an RPC header. 2782 */ 2783 int 2784 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, 2785 struct nfsrv_descript **ndp) 2786 { 2787 struct nfsrv_rec *rec; 2788 struct mbuf *m; 2789 struct sockaddr *nam; 2790 struct nfsrv_descript *nd; 2791 int error; 2792 2793 *ndp = NULL; 2794 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) 2795 return (ENOBUFS); 2796 rec = STAILQ_FIRST(&slp->ns_rec); 2797 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 2798 KKASSERT(slp->ns_numrec > 0); 2799 --slp->ns_numrec; 2800 nam = rec->nr_address; 2801 m = rec->nr_packet; 2802 kfree(rec, M_NFSRVDESC); 2803 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2804 M_NFSRVDESC, M_WAITOK); 2805 nd->nd_md = nd->nd_mrep = m; 2806 nd->nd_nam2 = nam; 2807 nd->nd_dpos = mtod(m, caddr_t); 2808 error = nfs_getreq(nd, nfsd, TRUE); 2809 if (error) { 2810 if (nam) { 2811 FREE(nam, M_SONAME); 2812 } 2813 kfree((caddr_t)nd, M_NFSRVDESC); 2814 return (error); 2815 } 2816 *ndp = nd; 2817 nfsd->nfsd_nd = nd; 2818 return (0); 2819 } 2820 2821 /* 2822 * Try to assign service sockets to nfsd threads based on the number 2823 * of new rpc requests that have been queued on the service socket. 2824 * 2825 * If no nfsd's are available or additonal requests are pending, set the 2826 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for 2827 * the work in the nfssvc_sock list when it is finished processing its 2828 * current work. This flag is only cleared when an nfsd can not find 2829 * any new work to perform. 2830 */ 2831 void 2832 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel) 2833 { 2834 struct nfsd *nd; 2835 2836 if ((slp->ns_flag & SLP_VALID) == 0) 2837 return; 2838 if (nparallel <= 1) 2839 nparallel = 1; 2840 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) { 2841 if (nd->nfsd_flag & NFSD_WAITING) { 2842 nd->nfsd_flag &= ~NFSD_WAITING; 2843 if (nd->nfsd_slp) 2844 panic("nfsd wakeup"); 2845 slp->ns_sref++; 2846 nd->nfsd_slp = slp; 2847 wakeup((caddr_t)nd); 2848 if (--nparallel == 0) 2849 break; 2850 } 2851 } 2852 if (nparallel) { 2853 slp->ns_flag |= SLP_DOREC; 2854 nfsd_head_flag |= NFSD_CHECKSLP; 2855 } 2856 } 2857 #endif /* NFS_NOSERVER */ 2858