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