1 /* $NetBSD: nfs_socket.c,v 1.83 2003/04/24 21:21:05 drochner Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 39 */ 40 41 /* 42 * Socket operations for use by nfs 43 */ 44 45 #include <sys/cdefs.h> 46 __KERNEL_RCSID(0, "$NetBSD: nfs_socket.c,v 1.83 2003/04/24 21:21:05 drochner Exp $"); 47 48 #include "fs_nfs.h" 49 #include "opt_nfs.h" 50 #include "opt_nfsserver.h" 51 #include "opt_inet.h" 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/callout.h> 56 #include <sys/proc.h> 57 #include <sys/mount.h> 58 #include <sys/kernel.h> 59 #include <sys/mbuf.h> 60 #include <sys/vnode.h> 61 #include <sys/domain.h> 62 #include <sys/protosw.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/syslog.h> 66 #include <sys/tprintf.h> 67 #include <sys/namei.h> 68 #include <sys/signal.h> 69 #include <sys/signalvar.h> 70 71 #include <netinet/in.h> 72 #include <netinet/tcp.h> 73 74 #include <nfs/rpcv2.h> 75 #include <nfs/nfsproto.h> 76 #include <nfs/nfs.h> 77 #include <nfs/xdr_subs.h> 78 #include <nfs/nfsm_subs.h> 79 #include <nfs/nfsmount.h> 80 #include <nfs/nfsnode.h> 81 #include <nfs/nfsrtt.h> 82 #include <nfs/nqnfs.h> 83 #include <nfs/nfs_var.h> 84 85 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 86 #ifdef MBUFTRACE 87 struct mowner nfs_mowner = { "nfs" }; 88 #endif 89 90 #define TRUE 1 91 #define FALSE 0 92 93 /* 94 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 95 * Use the mean and mean deviation of rtt for the appropriate type of rpc 96 * for the frequent rpcs and a default for the others. 97 * The justification for doing "other" this way is that these rpcs 98 * happen so infrequently that timer est. would probably be stale. 99 * Also, since many of these rpcs are 100 * non-idempotent, a conservative timeout is desired. 101 * getattr, lookup - A+2D 102 * read, write - A+4D 103 * other - nm_timeo 104 */ 105 #define NFS_RTO(n, t) \ 106 ((t) == 0 ? (n)->nm_timeo : \ 107 ((t) < 3 ? \ 108 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 109 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 110 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 111 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 112 /* 113 * External data, mostly RPC constants in XDR form 114 */ 115 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 116 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 117 rpc_auth_kerb; 118 extern u_int32_t nfs_prog, nqnfs_prog; 119 extern time_t nqnfsstarttime; 120 extern const int nfsv3_procid[NFS_NPROCS]; 121 extern int nfs_ticks; 122 123 /* 124 * Defines which timer to use for the procnum. 125 * 0 - default 126 * 1 - getattr 127 * 2 - lookup 128 * 3 - read 129 * 4 - write 130 */ 131 static const int proct[NFS_NPROCS] = { 132 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 133 0, 0, 0, 134 }; 135 136 /* 137 * There is a congestion window for outstanding rpcs maintained per mount 138 * point. The cwnd size is adjusted in roughly the way that: 139 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 140 * SIGCOMM '88". ACM, August 1988. 141 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 142 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 143 * of rpcs is in progress. 144 * (The sent count and cwnd are scaled for integer arith.) 145 * Variants of "slow start" were tried and were found to be too much of a 146 * performance hit (ave. rtt 3 times larger), 147 * I suspect due to the large rtt that nfs rpcs have. 148 */ 149 #define NFS_CWNDSCALE 256 150 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 151 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 152 int nfsrtton = 0; 153 struct nfsrtt nfsrtt; 154 struct nfsreqhead nfs_reqq; 155 156 struct callout nfs_timer_ch = CALLOUT_INITIALIZER; 157 158 /* 159 * Initialize sockets and congestion for a new NFS connection. 160 * We do not free the sockaddr if error. 161 */ 162 int 163 nfs_connect(nmp, rep) 164 struct nfsmount *nmp; 165 struct nfsreq *rep; 166 { 167 struct socket *so; 168 int s, error, rcvreserve, sndreserve; 169 struct sockaddr *saddr; 170 struct sockaddr_in *sin; 171 #ifdef INET6 172 struct sockaddr_in6 *sin6; 173 #endif 174 struct mbuf *m; 175 176 nmp->nm_so = (struct socket *)0; 177 saddr = mtod(nmp->nm_nam, struct sockaddr *); 178 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 179 nmp->nm_soproto); 180 if (error) 181 goto bad; 182 so = nmp->nm_so; 183 #ifdef MBUFTRACE 184 so->so_mowner = &nfs_mowner; 185 so->so_rcv.sb_mowner = &nfs_mowner; 186 so->so_snd.sb_mowner = &nfs_mowner; 187 #endif 188 nmp->nm_soflags = so->so_proto->pr_flags; 189 190 /* 191 * Some servers require that the client port be a reserved port number. 192 */ 193 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 194 m = m_get(M_WAIT, MT_SOOPTS); 195 MCLAIM(m, so->so_mowner); 196 *mtod(m, int32_t *) = IP_PORTRANGE_LOW; 197 m->m_len = sizeof(int32_t); 198 if ((error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, m))) 199 goto bad; 200 m = m_get(M_WAIT, MT_SONAME); 201 MCLAIM(m, so->so_mowner); 202 sin = mtod(m, struct sockaddr_in *); 203 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 204 sin->sin_family = AF_INET; 205 sin->sin_addr.s_addr = INADDR_ANY; 206 sin->sin_port = 0; 207 error = sobind(so, m, &proc0); 208 m_freem(m); 209 if (error) 210 goto bad; 211 } 212 #ifdef INET6 213 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 214 m = m_get(M_WAIT, MT_SOOPTS); 215 MCLAIM(m, so->so_mowner); 216 *mtod(m, int32_t *) = IPV6_PORTRANGE_LOW; 217 m->m_len = sizeof(int32_t); 218 if ((error = sosetopt(so, IPPROTO_IPV6, IPV6_PORTRANGE, m))) 219 goto bad; 220 m = m_get(M_WAIT, MT_SONAME); 221 MCLAIM(m, so->so_mowner); 222 sin6 = mtod(m, struct sockaddr_in6 *); 223 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 224 sin6->sin6_family = AF_INET6; 225 sin6->sin6_addr = in6addr_any; 226 sin6->sin6_port = 0; 227 error = sobind(so, m, &proc0); 228 m_freem(m); 229 if (error) 230 goto bad; 231 } 232 #endif 233 234 /* 235 * Protocols that do not require connections may be optionally left 236 * unconnected for servers that reply from a port other than NFS_PORT. 237 */ 238 if (nmp->nm_flag & NFSMNT_NOCONN) { 239 if (nmp->nm_soflags & PR_CONNREQUIRED) { 240 error = ENOTCONN; 241 goto bad; 242 } 243 } else { 244 error = soconnect(so, nmp->nm_nam); 245 if (error) 246 goto bad; 247 248 /* 249 * Wait for the connection to complete. Cribbed from the 250 * connect system call but with the wait timing out so 251 * that interruptible mounts don't hang here for a long time. 252 */ 253 s = splsoftnet(); 254 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 255 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 256 "nfscn1", 2 * hz); 257 if ((so->so_state & SS_ISCONNECTING) && 258 so->so_error == 0 && rep && 259 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 260 so->so_state &= ~SS_ISCONNECTING; 261 splx(s); 262 goto bad; 263 } 264 } 265 if (so->so_error) { 266 error = so->so_error; 267 so->so_error = 0; 268 splx(s); 269 goto bad; 270 } 271 splx(s); 272 } 273 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 274 so->so_rcv.sb_timeo = (5 * hz); 275 so->so_snd.sb_timeo = (5 * hz); 276 } else { 277 so->so_rcv.sb_timeo = 0; 278 so->so_snd.sb_timeo = 0; 279 } 280 if (nmp->nm_sotype == SOCK_DGRAM) { 281 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 282 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 283 NFS_MAXPKTHDR) * 2; 284 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 285 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 286 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 287 NFS_MAXPKTHDR) * 2; 288 } else { 289 if (nmp->nm_sotype != SOCK_STREAM) 290 panic("nfscon sotype"); 291 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 292 m = m_get(M_WAIT, MT_SOOPTS); 293 MCLAIM(m, so->so_mowner); 294 *mtod(m, int32_t *) = 1; 295 m->m_len = sizeof(int32_t); 296 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 297 } 298 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 299 m = m_get(M_WAIT, MT_SOOPTS); 300 MCLAIM(m, so->so_mowner); 301 *mtod(m, int32_t *) = 1; 302 m->m_len = sizeof(int32_t); 303 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 304 } 305 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 306 sizeof (u_int32_t)) * 2; 307 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 308 sizeof (u_int32_t)) * 2; 309 } 310 error = soreserve(so, sndreserve, rcvreserve); 311 if (error) 312 goto bad; 313 so->so_rcv.sb_flags |= SB_NOINTR; 314 so->so_snd.sb_flags |= SB_NOINTR; 315 316 /* Initialize other non-zero congestion variables */ 317 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 318 NFS_TIMEO << 3; 319 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 320 nmp->nm_sdrtt[3] = 0; 321 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 322 nmp->nm_sent = 0; 323 nmp->nm_timeouts = 0; 324 return (0); 325 326 bad: 327 nfs_disconnect(nmp); 328 return (error); 329 } 330 331 /* 332 * Reconnect routine: 333 * Called when a connection is broken on a reliable protocol. 334 * - clean up the old socket 335 * - nfs_connect() again 336 * - set R_MUSTRESEND for all outstanding requests on mount point 337 * If this fails the mount point is DEAD! 338 * nb: Must be called with the nfs_sndlock() set on the mount point. 339 */ 340 int 341 nfs_reconnect(rep) 342 struct nfsreq *rep; 343 { 344 struct nfsreq *rp; 345 struct nfsmount *nmp = rep->r_nmp; 346 int error; 347 348 nfs_disconnect(nmp); 349 while ((error = nfs_connect(nmp, rep)) != 0) { 350 if (error == EINTR || error == ERESTART) 351 return (EINTR); 352 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscn2", 0); 353 } 354 355 /* 356 * Loop through outstanding request list and fix up all requests 357 * on old socket. 358 */ 359 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 360 if (rp->r_nmp == nmp) 361 rp->r_flags |= R_MUSTRESEND; 362 } 363 return (0); 364 } 365 366 /* 367 * NFS disconnect. Clean up and unlink. 368 */ 369 void 370 nfs_disconnect(nmp) 371 struct nfsmount *nmp; 372 { 373 struct socket *so; 374 int drain = 0; 375 376 if (nmp->nm_so) { 377 so = nmp->nm_so; 378 nmp->nm_so = (struct socket *)0; 379 soshutdown(so, 2); 380 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 381 if (drain) { 382 /* 383 * soshutdown() above should wake up the current 384 * listener. 385 * Now wake up those waiting for the receive lock, and 386 * wait for them to go away unhappy, to prevent *nmp 387 * from evaporating while they're sleeping. 388 */ 389 while (nmp->nm_waiters > 0) { 390 wakeup (&nmp->nm_iflag); 391 (void) tsleep(&nmp->nm_waiters, PVFS, 392 "nfsdis", 0); 393 } 394 } 395 soclose(so); 396 } 397 #ifdef DIAGNOSTIC 398 if (drain && (nmp->nm_waiters > 0)) 399 panic("nfs_disconnect: waiters left after drain?"); 400 #endif 401 } 402 403 void 404 nfs_safedisconnect(nmp) 405 struct nfsmount *nmp; 406 { 407 struct nfsreq dummyreq; 408 409 memset(&dummyreq, 0, sizeof(dummyreq)); 410 dummyreq.r_nmp = nmp; 411 nfs_rcvlock(&dummyreq); /* XXX ignored error return */ 412 nfs_disconnect(nmp); 413 nfs_rcvunlock(&nmp->nm_iflag); 414 } 415 416 /* 417 * This is the nfs send routine. For connection based socket types, it 418 * must be called with an nfs_sndlock() on the socket. 419 * "rep == NULL" indicates that it has been called from a server. 420 * For the client side: 421 * - return EINTR if the RPC is terminated, 0 otherwise 422 * - set R_MUSTRESEND if the send fails for any reason 423 * - do any cleanup required by recoverable socket errors (? ? ?) 424 * For the server side: 425 * - return EINTR or ERESTART if interrupted by a signal 426 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 427 * - do any cleanup required by recoverable socket errors (? ? ?) 428 */ 429 int 430 nfs_send(so, nam, top, rep) 431 struct socket *so; 432 struct mbuf *nam; 433 struct mbuf *top; 434 struct nfsreq *rep; 435 { 436 struct mbuf *sendnam; 437 int error, soflags, flags; 438 439 if (rep) { 440 if (rep->r_flags & R_SOFTTERM) { 441 m_freem(top); 442 return (EINTR); 443 } 444 if ((so = rep->r_nmp->nm_so) == NULL) { 445 rep->r_flags |= R_MUSTRESEND; 446 m_freem(top); 447 return (0); 448 } 449 rep->r_flags &= ~R_MUSTRESEND; 450 soflags = rep->r_nmp->nm_soflags; 451 } else 452 soflags = so->so_proto->pr_flags; 453 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 454 sendnam = (struct mbuf *)0; 455 else 456 sendnam = nam; 457 if (so->so_type == SOCK_SEQPACKET) 458 flags = MSG_EOR; 459 else 460 flags = 0; 461 462 error = (*so->so_send)(so, sendnam, (struct uio *)0, top, 463 (struct mbuf *)0, flags); 464 if (error) { 465 if (rep) { 466 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 467 /* 468 * We're too fast for the network/driver, 469 * and UDP isn't flowcontrolled. 470 * We need to resend. This is not fatal, 471 * just try again. 472 * 473 * Could be smarter here by doing some sort 474 * of a backoff, but this is rare. 475 */ 476 rep->r_flags |= R_MUSTRESEND; 477 } else { 478 log(LOG_INFO, "nfs send error %d for %s\n", 479 error, 480 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 481 /* 482 * Deal with errors for the client side. 483 */ 484 if (rep->r_flags & R_SOFTTERM) 485 error = EINTR; 486 else 487 rep->r_flags |= R_MUSTRESEND; 488 } 489 } else { 490 /* 491 * See above. This error can happen under normal 492 * circumstances and the log is too noisy. 493 * The error will still show up in nfsstat. 494 */ 495 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 496 log(LOG_INFO, "nfsd send error %d\n", error); 497 } 498 499 /* 500 * Handle any recoverable (soft) socket errors here. (? ? ?) 501 */ 502 if (error != EINTR && error != ERESTART && 503 error != EWOULDBLOCK && error != EPIPE) 504 error = 0; 505 } 506 return (error); 507 } 508 509 #ifdef NFS 510 /* 511 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 512 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 513 * Mark and consolidate the data into a new mbuf list. 514 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 515 * small mbufs. 516 * For SOCK_STREAM we must be very careful to read an entire record once 517 * we have read any of it, even if the system call has been interrupted. 518 */ 519 int 520 nfs_receive(rep, aname, mp) 521 struct nfsreq *rep; 522 struct mbuf **aname; 523 struct mbuf **mp; 524 { 525 struct socket *so; 526 struct uio auio; 527 struct iovec aio; 528 struct mbuf *m; 529 struct mbuf *control; 530 u_int32_t len; 531 struct mbuf **getnam; 532 int error, sotype, rcvflg; 533 struct proc *p = curproc; /* XXX */ 534 535 /* 536 * Set up arguments for soreceive() 537 */ 538 *mp = (struct mbuf *)0; 539 *aname = (struct mbuf *)0; 540 sotype = rep->r_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(&rep->r_nmp->nm_iflag, 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->r_mrep || (rep->r_flags & R_SOFTTERM)) { 565 nfs_sndunlock(&rep->r_nmp->nm_iflag); 566 return (EINTR); 567 } 568 so = rep->r_nmp->nm_so; 569 if (!so) { 570 error = nfs_reconnect(rep); 571 if (error) { 572 nfs_sndunlock(&rep->r_nmp->nm_iflag); 573 return (error); 574 } 575 goto tryagain; 576 } 577 while (rep->r_flags & R_MUSTRESEND) { 578 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_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(rep)) != 0) { 584 nfs_sndunlock(&rep->r_nmp->nm_iflag); 585 return (error); 586 } 587 goto tryagain; 588 } 589 } 590 nfs_sndunlock(&rep->r_nmp->nm_iflag); 591 if (sotype == SOCK_STREAM) { 592 aio.iov_base = (caddr_t) &len; 593 aio.iov_len = sizeof(u_int32_t); 594 auio.uio_iov = &aio; 595 auio.uio_iovcnt = 1; 596 auio.uio_segflg = UIO_SYSSPACE; 597 auio.uio_rw = UIO_READ; 598 auio.uio_offset = 0; 599 auio.uio_resid = sizeof(u_int32_t); 600 auio.uio_procp = p; 601 do { 602 rcvflg = MSG_WAITALL; 603 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 604 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 605 if (error == EWOULDBLOCK && rep) { 606 if (rep->r_flags & R_SOFTTERM) 607 return (EINTR); 608 } 609 } while (error == EWOULDBLOCK); 610 if (!error && auio.uio_resid > 0) { 611 /* 612 * Don't log a 0 byte receive; it means 613 * that the socket has been closed, and 614 * can happen during normal operation 615 * (forcible unmount or Solaris server). 616 */ 617 if (auio.uio_resid != sizeof (u_int32_t)) 618 log(LOG_INFO, 619 "short receive (%lu/%lu) from nfs server %s\n", 620 (u_long)sizeof(u_int32_t) - auio.uio_resid, 621 (u_long)sizeof(u_int32_t), 622 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 623 error = EPIPE; 624 } 625 if (error) 626 goto errout; 627 len = ntohl(len) & ~0x80000000; 628 /* 629 * This is SERIOUS! We are out of sync with the sender 630 * and forcing a disconnect/reconnect is all I can do. 631 */ 632 if (len > NFS_MAXPACKET) { 633 log(LOG_ERR, "%s (%d) from nfs server %s\n", 634 "impossible packet length", 635 len, 636 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 637 error = EFBIG; 638 goto errout; 639 } 640 auio.uio_resid = len; 641 do { 642 rcvflg = MSG_WAITALL; 643 error = (*so->so_receive)(so, (struct mbuf **)0, 644 &auio, mp, (struct mbuf **)0, &rcvflg); 645 } while (error == EWOULDBLOCK || error == EINTR || 646 error == ERESTART); 647 if (!error && auio.uio_resid > 0) { 648 if (len != auio.uio_resid) 649 log(LOG_INFO, 650 "short receive (%lu/%d) from nfs server %s\n", 651 (u_long)len - auio.uio_resid, len, 652 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 653 error = EPIPE; 654 } 655 } else { 656 /* 657 * NB: Since uio_resid is big, MSG_WAITALL is ignored 658 * and soreceive() will return when it has either a 659 * control msg or a data msg. 660 * We have no use for control msg., but must grab them 661 * and then throw them away so we know what is going 662 * on. 663 */ 664 auio.uio_resid = len = 100000000; /* Anything Big */ 665 auio.uio_procp = p; 666 do { 667 rcvflg = 0; 668 error = (*so->so_receive)(so, (struct mbuf **)0, 669 &auio, mp, &control, &rcvflg); 670 if (control) 671 m_freem(control); 672 if (error == EWOULDBLOCK && rep) { 673 if (rep->r_flags & R_SOFTTERM) 674 return (EINTR); 675 } 676 } while (error == EWOULDBLOCK || 677 (!error && *mp == NULL && control)); 678 if ((rcvflg & MSG_EOR) == 0) 679 printf("Egad!!\n"); 680 if (!error && *mp == NULL) 681 error = EPIPE; 682 len -= auio.uio_resid; 683 } 684 errout: 685 if (error && error != EINTR && error != ERESTART) { 686 m_freem(*mp); 687 *mp = (struct mbuf *)0; 688 if (error != EPIPE) 689 log(LOG_INFO, 690 "receive error %d from nfs server %s\n", 691 error, 692 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 693 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 694 if (!error) 695 error = nfs_reconnect(rep); 696 if (!error) 697 goto tryagain; 698 else 699 nfs_sndunlock(&rep->r_nmp->nm_iflag); 700 } 701 } else { 702 if ((so = rep->r_nmp->nm_so) == NULL) 703 return (EACCES); 704 if (so->so_state & SS_ISCONNECTED) 705 getnam = (struct mbuf **)0; 706 else 707 getnam = aname; 708 auio.uio_resid = len = 1000000; 709 auio.uio_procp = p; 710 do { 711 rcvflg = 0; 712 error = (*so->so_receive)(so, getnam, &auio, mp, 713 (struct mbuf **)0, &rcvflg); 714 if (error == EWOULDBLOCK && 715 (rep->r_flags & R_SOFTTERM)) 716 return (EINTR); 717 } while (error == EWOULDBLOCK); 718 len -= auio.uio_resid; 719 if (!error && *mp == NULL) 720 error = EPIPE; 721 } 722 if (error) { 723 m_freem(*mp); 724 *mp = (struct mbuf *)0; 725 } 726 return (error); 727 } 728 729 /* 730 * Implement receipt of reply on a socket. 731 * We must search through the list of received datagrams matching them 732 * with outstanding requests using the xid, until ours is found. 733 */ 734 /* ARGSUSED */ 735 int 736 nfs_reply(myrep) 737 struct nfsreq *myrep; 738 { 739 struct nfsreq *rep; 740 struct nfsmount *nmp = myrep->r_nmp; 741 int32_t t1; 742 struct mbuf *mrep, *nam, *md; 743 u_int32_t rxid, *tl; 744 caddr_t dpos, cp2; 745 int error; 746 747 /* 748 * Loop around until we get our own reply 749 */ 750 for (;;) { 751 /* 752 * Lock against other receivers so that I don't get stuck in 753 * sbwait() after someone else has received my reply for me. 754 * Also necessary for connection based protocols to avoid 755 * race conditions during a reconnect. 756 */ 757 error = nfs_rcvlock(myrep); 758 if (error == EALREADY) 759 return (0); 760 if (error) 761 return (error); 762 /* 763 * Get the next Rpc reply off the socket 764 */ 765 nmp->nm_waiters++; 766 error = nfs_receive(myrep, &nam, &mrep); 767 nfs_rcvunlock(&nmp->nm_iflag); 768 if (error) { 769 770 if (nmp->nm_iflag & NFSMNT_DISMNT) { 771 /* 772 * Oops, we're going away now.. 773 */ 774 nmp->nm_waiters--; 775 wakeup (&nmp->nm_waiters); 776 return error; 777 } 778 nmp->nm_waiters--; 779 /* 780 * Ignore routing errors on connectionless protocols? ? 781 */ 782 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 783 nmp->nm_so->so_error = 0; 784 #ifdef DEBUG 785 printf("nfs_reply: ignoring error %d\n", error); 786 #endif 787 if (myrep->r_flags & R_GETONEREP) 788 return (0); 789 continue; 790 } 791 return (error); 792 } 793 nmp->nm_waiters--; 794 if (nam) 795 m_freem(nam); 796 797 /* 798 * Get the xid and check that it is an rpc reply 799 */ 800 md = mrep; 801 dpos = mtod(md, caddr_t); 802 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 803 rxid = *tl++; 804 if (*tl != rpc_reply) { 805 #ifndef NFS_V2_ONLY 806 if (nmp->nm_flag & NFSMNT_NQNFS) { 807 if (nqnfs_callback(nmp, mrep, md, dpos)) 808 nfsstats.rpcinvalid++; 809 } else 810 #endif 811 { 812 nfsstats.rpcinvalid++; 813 m_freem(mrep); 814 } 815 nfsmout: 816 if (myrep->r_flags & R_GETONEREP) 817 return (0); 818 continue; 819 } 820 821 /* 822 * Loop through the request list to match up the reply 823 * Iff no match, just drop the datagram 824 */ 825 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 826 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 827 /* Found it.. */ 828 rep->r_mrep = mrep; 829 rep->r_md = md; 830 rep->r_dpos = dpos; 831 if (nfsrtton) { 832 struct rttl *rt; 833 834 rt = &nfsrtt.rttl[nfsrtt.pos]; 835 rt->proc = rep->r_procnum; 836 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 837 rt->sent = nmp->nm_sent; 838 rt->cwnd = nmp->nm_cwnd; 839 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 840 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 841 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 842 rt->tstamp = time; 843 if (rep->r_flags & R_TIMING) 844 rt->rtt = rep->r_rtt; 845 else 846 rt->rtt = 1000000; 847 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 848 } 849 /* 850 * Update congestion window. 851 * Do the additive increase of 852 * one rpc/rtt. 853 */ 854 if (nmp->nm_cwnd <= nmp->nm_sent) { 855 nmp->nm_cwnd += 856 (NFS_CWNDSCALE * NFS_CWNDSCALE + 857 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 858 if (nmp->nm_cwnd > NFS_MAXCWND) 859 nmp->nm_cwnd = NFS_MAXCWND; 860 } 861 rep->r_flags &= ~R_SENT; 862 nmp->nm_sent -= NFS_CWNDSCALE; 863 /* 864 * Update rtt using a gain of 0.125 on the mean 865 * and a gain of 0.25 on the deviation. 866 */ 867 if (rep->r_flags & R_TIMING) { 868 /* 869 * Since the timer resolution of 870 * NFS_HZ is so course, it can often 871 * result in r_rtt == 0. Since 872 * r_rtt == N means that the actual 873 * rtt is between N+dt and N+2-dt ticks, 874 * add 1. 875 */ 876 t1 = rep->r_rtt + 1; 877 t1 -= (NFS_SRTT(rep) >> 3); 878 NFS_SRTT(rep) += t1; 879 if (t1 < 0) 880 t1 = -t1; 881 t1 -= (NFS_SDRTT(rep) >> 2); 882 NFS_SDRTT(rep) += t1; 883 } 884 nmp->nm_timeouts = 0; 885 break; 886 } 887 } 888 /* 889 * If not matched to a request, drop it. 890 * If it's mine, get out. 891 */ 892 if (rep == 0) { 893 nfsstats.rpcunexpected++; 894 m_freem(mrep); 895 } else if (rep == myrep) { 896 if (rep->r_mrep == NULL) 897 panic("nfsreply nil"); 898 return (0); 899 } 900 if (myrep->r_flags & R_GETONEREP) 901 return (0); 902 } 903 } 904 905 /* 906 * nfs_request - goes something like this 907 * - fill in request struct 908 * - links it into list 909 * - calls nfs_send() for first transmit 910 * - calls nfs_receive() to get reply 911 * - break down rpc header and return with nfs reply pointed to 912 * by mrep or error 913 * nb: always frees up mreq mbuf list 914 */ 915 int 916 nfs_request(np, mrest, procnum, procp, cred, mrp, mdp, dposp) 917 struct nfsnode *np; 918 struct mbuf *mrest; 919 int procnum; 920 struct proc *procp; 921 struct ucred *cred; 922 struct mbuf **mrp; 923 struct mbuf **mdp; 924 caddr_t *dposp; 925 { 926 struct mbuf *m, *mrep; 927 struct nfsreq *rep; 928 u_int32_t *tl; 929 int i; 930 struct nfsmount *nmp; 931 struct mbuf *md, *mheadend; 932 char nickv[RPCX_NICKVERF]; 933 time_t reqtime, waituntil; 934 caddr_t dpos, cp2; 935 int t1, s, error = 0, mrest_len, auth_len, auth_type; 936 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 937 int verf_len, verf_type; 938 u_int32_t xid; 939 char *auth_str, *verf_str; 940 NFSKERBKEY_T key; /* save session key */ 941 #ifndef NFS_V2_ONLY 942 int nqlflag, cachable; 943 u_quad_t frev; 944 #endif 945 946 KASSERT(cred != NULL); 947 nmp = VFSTONFS(np->n_vnode->v_mount); 948 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 949 rep->r_nmp = nmp; 950 rep->r_procp = procp; 951 rep->r_procnum = procnum; 952 i = 0; 953 m = mrest; 954 while (m) { 955 i += m->m_len; 956 m = m->m_next; 957 } 958 mrest_len = i; 959 960 /* 961 * Get the RPC header with authorization. 962 */ 963 kerbauth: 964 verf_str = auth_str = (char *)0; 965 if (nmp->nm_flag & NFSMNT_KERB) { 966 verf_str = nickv; 967 verf_len = sizeof (nickv); 968 auth_type = RPCAUTH_KERB4; 969 memset((caddr_t)key, 0, sizeof (key)); 970 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 971 &auth_len, verf_str, verf_len)) { 972 error = nfs_getauth(nmp, rep, cred, &auth_str, 973 &auth_len, verf_str, &verf_len, key); 974 if (error) { 975 free((caddr_t)rep, M_NFSREQ); 976 m_freem(mrest); 977 return (error); 978 } 979 } 980 } else { 981 auth_type = RPCAUTH_UNIX; 982 auth_len = (((cred->cr_ngroups > nmp->nm_numgrps) ? 983 nmp->nm_numgrps : cred->cr_ngroups) << 2) + 984 5 * NFSX_UNSIGNED; 985 } 986 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 987 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 988 if (auth_str) 989 free(auth_str, M_TEMP); 990 991 /* 992 * For stream protocols, insert a Sun RPC Record Mark. 993 */ 994 if (nmp->nm_sotype == SOCK_STREAM) { 995 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 996 *mtod(m, u_int32_t *) = htonl(0x80000000 | 997 (m->m_pkthdr.len - NFSX_UNSIGNED)); 998 } 999 rep->r_mreq = m; 1000 rep->r_xid = xid; 1001 tryagain: 1002 if (nmp->nm_flag & NFSMNT_SOFT) 1003 rep->r_retry = nmp->nm_retry; 1004 else 1005 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1006 rep->r_rtt = rep->r_rexmit = 0; 1007 if (proct[procnum] > 0) 1008 rep->r_flags = R_TIMING; 1009 else 1010 rep->r_flags = 0; 1011 rep->r_mrep = NULL; 1012 1013 /* 1014 * Do the client side RPC. 1015 */ 1016 nfsstats.rpcrequests++; 1017 /* 1018 * Chain request into list of outstanding requests. Be sure 1019 * to put it LAST so timer finds oldest requests first. 1020 */ 1021 s = splsoftnet(); 1022 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1023 1024 /* Get send time for nqnfs */ 1025 reqtime = time.tv_sec; 1026 1027 /* 1028 * If backing off another request or avoiding congestion, don't 1029 * send this one now but let timer do it. If not timing a request, 1030 * do it now. 1031 */ 1032 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1033 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1034 nmp->nm_sent < nmp->nm_cwnd)) { 1035 splx(s); 1036 if (nmp->nm_soflags & PR_CONNREQUIRED) 1037 error = nfs_sndlock(&nmp->nm_iflag, rep); 1038 if (!error) { 1039 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1040 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); 1041 if (nmp->nm_soflags & PR_CONNREQUIRED) 1042 nfs_sndunlock(&nmp->nm_iflag); 1043 } 1044 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1045 nmp->nm_sent += NFS_CWNDSCALE; 1046 rep->r_flags |= R_SENT; 1047 } 1048 } else { 1049 splx(s); 1050 rep->r_rtt = -1; 1051 } 1052 1053 /* 1054 * Wait for the reply from our send or the timer's. 1055 */ 1056 if (!error || error == EPIPE) 1057 error = nfs_reply(rep); 1058 1059 /* 1060 * RPC done, unlink the request. 1061 */ 1062 s = splsoftnet(); 1063 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1064 splx(s); 1065 1066 /* 1067 * Decrement the outstanding request count. 1068 */ 1069 if (rep->r_flags & R_SENT) { 1070 rep->r_flags &= ~R_SENT; /* paranoia */ 1071 nmp->nm_sent -= NFS_CWNDSCALE; 1072 } 1073 1074 /* 1075 * If there was a successful reply and a tprintf msg. 1076 * tprintf a response. 1077 */ 1078 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1079 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1080 "is alive again"); 1081 mrep = rep->r_mrep; 1082 md = rep->r_md; 1083 dpos = rep->r_dpos; 1084 if (error) { 1085 m_freem(rep->r_mreq); 1086 free((caddr_t)rep, M_NFSREQ); 1087 return (error); 1088 } 1089 1090 /* 1091 * break down the rpc header and check if ok 1092 */ 1093 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1094 if (*tl++ == rpc_msgdenied) { 1095 if (*tl == rpc_mismatch) 1096 error = EOPNOTSUPP; 1097 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1098 if (!failed_auth) { 1099 failed_auth++; 1100 mheadend->m_next = (struct mbuf *)0; 1101 m_freem(mrep); 1102 m_freem(rep->r_mreq); 1103 goto kerbauth; 1104 } else 1105 error = EAUTH; 1106 } else 1107 error = EACCES; 1108 m_freem(mrep); 1109 m_freem(rep->r_mreq); 1110 free((caddr_t)rep, M_NFSREQ); 1111 return (error); 1112 } 1113 1114 /* 1115 * Grab any Kerberos verifier, otherwise just throw it away. 1116 */ 1117 verf_type = fxdr_unsigned(int, *tl++); 1118 i = fxdr_unsigned(int32_t, *tl); 1119 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1120 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1121 if (error) 1122 goto nfsmout; 1123 } else if (i > 0) 1124 nfsm_adv(nfsm_rndup(i)); 1125 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1126 /* 0 == ok */ 1127 if (*tl == 0) { 1128 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1129 if (*tl != 0) { 1130 error = fxdr_unsigned(int, *tl); 1131 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1132 error == NFSERR_TRYLATER) { 1133 m_freem(mrep); 1134 error = 0; 1135 waituntil = time.tv_sec + trylater_delay; 1136 while (time.tv_sec < waituntil) 1137 (void) tsleep((caddr_t)&lbolt, 1138 PSOCK, "nqnfstry", 0); 1139 trylater_delay *= nfs_backoff[trylater_cnt]; 1140 if (trylater_cnt < 7) 1141 trylater_cnt++; 1142 goto tryagain; 1143 } 1144 1145 /* 1146 * If the File Handle was stale, invalidate the 1147 * lookup cache, just in case. 1148 */ 1149 if (error == ESTALE) 1150 cache_purge(NFSTOV(np)); 1151 if (nmp->nm_flag & NFSMNT_NFSV3) { 1152 *mrp = mrep; 1153 *mdp = md; 1154 *dposp = dpos; 1155 error |= NFSERR_RETERR; 1156 } else 1157 m_freem(mrep); 1158 m_freem(rep->r_mreq); 1159 free((caddr_t)rep, M_NFSREQ); 1160 return (error); 1161 } 1162 1163 #ifndef NFS_V2_ONLY 1164 /* 1165 * For nqnfs, get any lease in reply 1166 */ 1167 if (nmp->nm_flag & NFSMNT_NQNFS) { 1168 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1169 if (*tl) { 1170 nqlflag = fxdr_unsigned(int, *tl); 1171 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1172 cachable = fxdr_unsigned(int, *tl++); 1173 reqtime += fxdr_unsigned(int, *tl++); 1174 if (reqtime > time.tv_sec) { 1175 frev = fxdr_hyper(tl); 1176 nqnfs_clientlease(nmp, np, nqlflag, 1177 cachable, reqtime, frev); 1178 } 1179 } 1180 } 1181 #endif 1182 *mrp = mrep; 1183 *mdp = md; 1184 *dposp = dpos; 1185 m_freem(rep->r_mreq); 1186 FREE((caddr_t)rep, M_NFSREQ); 1187 return (0); 1188 } 1189 m_freem(mrep); 1190 error = EPROTONOSUPPORT; 1191 nfsmout: 1192 m_freem(rep->r_mreq); 1193 free((caddr_t)rep, M_NFSREQ); 1194 return (error); 1195 } 1196 #endif /* NFS */ 1197 1198 /* 1199 * Generate the rpc reply header 1200 * siz arg. is used to decide if adding a cluster is worthwhile 1201 */ 1202 int 1203 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1204 int siz; 1205 struct nfsrv_descript *nd; 1206 struct nfssvc_sock *slp; 1207 int err; 1208 int cache; 1209 u_quad_t *frev; 1210 struct mbuf **mrq; 1211 struct mbuf **mbp; 1212 caddr_t *bposp; 1213 { 1214 u_int32_t *tl; 1215 struct mbuf *mreq; 1216 caddr_t bpos; 1217 struct mbuf *mb; 1218 1219 mreq = m_gethdr(M_WAIT, MT_DATA); 1220 MCLAIM(mreq, &nfs_mowner); 1221 mb = mreq; 1222 /* 1223 * If this is a big reply, use a cluster else 1224 * try and leave leading space for the lower level headers. 1225 */ 1226 siz += RPC_REPLYSIZ; 1227 if (siz >= max_datalen) { 1228 m_clget(mreq, M_WAIT); 1229 } else 1230 mreq->m_data += max_hdr; 1231 tl = mtod(mreq, u_int32_t *); 1232 mreq->m_len = 6 * NFSX_UNSIGNED; 1233 bpos = ((caddr_t)tl) + mreq->m_len; 1234 *tl++ = txdr_unsigned(nd->nd_retxid); 1235 *tl++ = rpc_reply; 1236 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1237 *tl++ = rpc_msgdenied; 1238 if (err & NFSERR_AUTHERR) { 1239 *tl++ = rpc_autherr; 1240 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1241 mreq->m_len -= NFSX_UNSIGNED; 1242 bpos -= NFSX_UNSIGNED; 1243 } else { 1244 *tl++ = rpc_mismatch; 1245 *tl++ = txdr_unsigned(RPC_VER2); 1246 *tl = txdr_unsigned(RPC_VER2); 1247 } 1248 } else { 1249 *tl++ = rpc_msgaccepted; 1250 1251 /* 1252 * For Kerberos authentication, we must send the nickname 1253 * verifier back, otherwise just RPCAUTH_NULL. 1254 */ 1255 if (nd->nd_flag & ND_KERBFULL) { 1256 struct nfsuid *nuidp; 1257 struct timeval ktvin, ktvout; 1258 1259 LIST_FOREACH(nuidp, NUIDHASH(slp, nd->nd_cr.cr_uid), 1260 nu_hash) { 1261 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1262 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1263 &nuidp->nu_haddr, nd->nd_nam2))) 1264 break; 1265 } 1266 if (nuidp) { 1267 ktvin.tv_sec = 1268 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1269 ktvin.tv_usec = 1270 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1271 1272 /* 1273 * Encrypt the timestamp in ecb mode using the 1274 * session key. 1275 */ 1276 #ifdef NFSKERB 1277 XXX 1278 #endif 1279 1280 *tl++ = rpc_auth_kerb; 1281 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1282 *tl = ktvout.tv_sec; 1283 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1284 *tl++ = ktvout.tv_usec; 1285 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1286 } else { 1287 *tl++ = 0; 1288 *tl++ = 0; 1289 } 1290 } else { 1291 *tl++ = 0; 1292 *tl++ = 0; 1293 } 1294 switch (err) { 1295 case EPROGUNAVAIL: 1296 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1297 break; 1298 case EPROGMISMATCH: 1299 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1300 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1301 if (nd->nd_flag & ND_NQNFS) { 1302 *tl++ = txdr_unsigned(3); 1303 *tl = txdr_unsigned(3); 1304 } else { 1305 *tl++ = txdr_unsigned(2); 1306 *tl = txdr_unsigned(3); 1307 } 1308 break; 1309 case EPROCUNAVAIL: 1310 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1311 break; 1312 case EBADRPC: 1313 *tl = txdr_unsigned(RPC_GARBAGE); 1314 break; 1315 default: 1316 *tl = 0; 1317 if (err != NFSERR_RETVOID) { 1318 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1319 if (err) 1320 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1321 else 1322 *tl = 0; 1323 } 1324 break; 1325 }; 1326 } 1327 1328 /* 1329 * For nqnfs, piggyback lease as requested. 1330 */ 1331 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1332 if (nd->nd_flag & ND_LEASE) { 1333 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1334 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1335 *tl++ = txdr_unsigned(cache); 1336 *tl++ = txdr_unsigned(nd->nd_duration); 1337 txdr_hyper(*frev, tl); 1338 } else { 1339 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1340 *tl = 0; 1341 } 1342 } 1343 if (mrq != NULL) 1344 *mrq = mreq; 1345 *mbp = mb; 1346 *bposp = bpos; 1347 if (err != 0 && err != NFSERR_RETVOID) 1348 nfsstats.srvrpc_errs++; 1349 return (0); 1350 } 1351 1352 /* 1353 * Nfs timer routine 1354 * Scan the nfsreq list and retranmit any requests that have timed out 1355 * To avoid retransmission attempts on STREAM sockets (in the future) make 1356 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1357 */ 1358 void 1359 nfs_timer(arg) 1360 void *arg; /* never used */ 1361 { 1362 struct nfsreq *rep; 1363 struct mbuf *m; 1364 struct socket *so; 1365 struct nfsmount *nmp; 1366 int timeo; 1367 int s, error; 1368 #ifdef NFSSERVER 1369 struct nfssvc_sock *slp; 1370 static long lasttime = 0; 1371 u_quad_t cur_usec; 1372 #endif 1373 1374 s = splsoftnet(); 1375 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1376 nmp = rep->r_nmp; 1377 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1378 continue; 1379 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1380 rep->r_flags |= R_SOFTTERM; 1381 continue; 1382 } 1383 if (rep->r_rtt >= 0) { 1384 rep->r_rtt++; 1385 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1386 timeo = nmp->nm_timeo; 1387 else 1388 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1389 if (nmp->nm_timeouts > 0) 1390 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1391 if (rep->r_rtt <= timeo) 1392 continue; 1393 if (nmp->nm_timeouts < 8) 1394 nmp->nm_timeouts++; 1395 } 1396 /* 1397 * Check for server not responding 1398 */ 1399 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1400 rep->r_rexmit > nmp->nm_deadthresh) { 1401 nfs_msg(rep->r_procp, 1402 nmp->nm_mountp->mnt_stat.f_mntfromname, 1403 "not responding"); 1404 rep->r_flags |= R_TPRINTFMSG; 1405 } 1406 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1407 nfsstats.rpctimeouts++; 1408 rep->r_flags |= R_SOFTTERM; 1409 continue; 1410 } 1411 if (nmp->nm_sotype != SOCK_DGRAM) { 1412 if (++rep->r_rexmit > NFS_MAXREXMIT) 1413 rep->r_rexmit = NFS_MAXREXMIT; 1414 continue; 1415 } 1416 if ((so = nmp->nm_so) == NULL) 1417 continue; 1418 1419 /* 1420 * If there is enough space and the window allows.. 1421 * Resend it 1422 * Set r_rtt to -1 in case we fail to send it now. 1423 */ 1424 rep->r_rtt = -1; 1425 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1426 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1427 (rep->r_flags & R_SENT) || 1428 nmp->nm_sent < nmp->nm_cwnd) && 1429 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1430 if (so->so_state & SS_ISCONNECTED) 1431 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1432 (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); 1433 else 1434 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1435 nmp->nm_nam, (struct mbuf *)0, (struct proc *)0); 1436 if (error) { 1437 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1438 #ifdef DEBUG 1439 printf("nfs_timer: ignoring error %d\n", 1440 error); 1441 #endif 1442 so->so_error = 0; 1443 } 1444 } else { 1445 /* 1446 * Iff first send, start timing 1447 * else turn timing off, backoff timer 1448 * and divide congestion window by 2. 1449 */ 1450 if (rep->r_flags & R_SENT) { 1451 rep->r_flags &= ~R_TIMING; 1452 if (++rep->r_rexmit > NFS_MAXREXMIT) 1453 rep->r_rexmit = NFS_MAXREXMIT; 1454 nmp->nm_cwnd >>= 1; 1455 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1456 nmp->nm_cwnd = NFS_CWNDSCALE; 1457 nfsstats.rpcretries++; 1458 } else { 1459 rep->r_flags |= R_SENT; 1460 nmp->nm_sent += NFS_CWNDSCALE; 1461 } 1462 rep->r_rtt = 0; 1463 } 1464 } 1465 } 1466 1467 #ifdef NFSSERVER 1468 /* 1469 * Call the nqnfs server timer once a second to handle leases. 1470 */ 1471 if (lasttime != time.tv_sec) { 1472 lasttime = time.tv_sec; 1473 nqnfs_serverd(); 1474 } 1475 1476 /* 1477 * Scan the write gathering queues for writes that need to be 1478 * completed now. 1479 */ 1480 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec; 1481 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1482 if (LIST_FIRST(&slp->ns_tq) && 1483 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) 1484 nfsrv_wakenfsd(slp); 1485 } 1486 #endif /* NFSSERVER */ 1487 splx(s); 1488 callout_reset(&nfs_timer_ch, nfs_ticks, nfs_timer, NULL); 1489 } 1490 1491 /*ARGSUSED*/ 1492 void 1493 nfs_exit(p, v) 1494 struct proc *p; 1495 void *v; 1496 { 1497 struct nfsreq *rp; 1498 int s = splsoftnet(); 1499 1500 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 1501 if (rp->r_procp == p) 1502 TAILQ_REMOVE(&nfs_reqq, rp, r_chain); 1503 } 1504 splx(s); 1505 } 1506 1507 /* 1508 * Test for a termination condition pending on the process. 1509 * This is used for NFSMNT_INT mounts. 1510 */ 1511 int 1512 nfs_sigintr(nmp, rep, p) 1513 struct nfsmount *nmp; 1514 struct nfsreq *rep; 1515 struct proc *p; 1516 { 1517 sigset_t ss; 1518 1519 if (rep && (rep->r_flags & R_SOFTTERM)) 1520 return (EINTR); 1521 if (!(nmp->nm_flag & NFSMNT_INT)) 1522 return (0); 1523 if (p) { 1524 sigpending1(p, &ss); 1525 #if 0 1526 sigminusset(&p->p_sigctx.ps_sigignore, &ss); 1527 #endif 1528 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1529 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1530 sigismember(&ss, SIGQUIT)) 1531 return (EINTR); 1532 } 1533 return (0); 1534 } 1535 1536 /* 1537 * Lock a socket against others. 1538 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1539 * and also to avoid race conditions between the processes with nfs requests 1540 * in progress when a reconnect is necessary. 1541 */ 1542 int 1543 nfs_sndlock(flagp, rep) 1544 int *flagp; 1545 struct nfsreq *rep; 1546 { 1547 struct proc *p; 1548 int slpflag = 0, slptimeo = 0; 1549 1550 if (rep) { 1551 p = rep->r_procp; 1552 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1553 slpflag = PCATCH; 1554 } else 1555 p = (struct proc *)0; 1556 while (*flagp & NFSMNT_SNDLOCK) { 1557 if (nfs_sigintr(rep->r_nmp, rep, p)) 1558 return (EINTR); 1559 *flagp |= NFSMNT_WANTSND; 1560 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1561 slptimeo); 1562 if (slpflag == PCATCH) { 1563 slpflag = 0; 1564 slptimeo = 2 * hz; 1565 } 1566 } 1567 *flagp |= NFSMNT_SNDLOCK; 1568 return (0); 1569 } 1570 1571 /* 1572 * Unlock the stream socket for others. 1573 */ 1574 void 1575 nfs_sndunlock(flagp) 1576 int *flagp; 1577 { 1578 1579 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1580 panic("nfs sndunlock"); 1581 *flagp &= ~NFSMNT_SNDLOCK; 1582 if (*flagp & NFSMNT_WANTSND) { 1583 *flagp &= ~NFSMNT_WANTSND; 1584 wakeup((caddr_t)flagp); 1585 } 1586 } 1587 1588 int 1589 nfs_rcvlock(rep) 1590 struct nfsreq *rep; 1591 { 1592 struct nfsmount *nmp = rep->r_nmp; 1593 int *flagp = &nmp->nm_iflag; 1594 int slpflag, slptimeo = 0; 1595 1596 if (*flagp & NFSMNT_DISMNT) 1597 return EIO; 1598 1599 if (*flagp & NFSMNT_INT) 1600 slpflag = PCATCH; 1601 else 1602 slpflag = 0; 1603 while (*flagp & NFSMNT_RCVLOCK) { 1604 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1605 return (EINTR); 1606 *flagp |= NFSMNT_WANTRCV; 1607 nmp->nm_waiters++; 1608 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1609 slptimeo); 1610 nmp->nm_waiters--; 1611 if (*flagp & NFSMNT_DISMNT) { 1612 wakeup(&nmp->nm_waiters); 1613 return EIO; 1614 } 1615 /* If our reply was received while we were sleeping, 1616 * then just return without taking the lock to avoid a 1617 * situation where a single iod could 'capture' the 1618 * receive lock. 1619 */ 1620 if (rep->r_mrep != NULL) 1621 return (EALREADY); 1622 if (slpflag == PCATCH) { 1623 slpflag = 0; 1624 slptimeo = 2 * hz; 1625 } 1626 } 1627 *flagp |= NFSMNT_RCVLOCK; 1628 return (0); 1629 } 1630 1631 /* 1632 * Unlock the stream socket for others. 1633 */ 1634 void 1635 nfs_rcvunlock(flagp) 1636 int *flagp; 1637 { 1638 1639 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1640 panic("nfs rcvunlock"); 1641 *flagp &= ~NFSMNT_RCVLOCK; 1642 if (*flagp & NFSMNT_WANTRCV) { 1643 *flagp &= ~NFSMNT_WANTRCV; 1644 wakeup((caddr_t)flagp); 1645 } 1646 } 1647 1648 /* 1649 * Parse an RPC request 1650 * - verify it 1651 * - fill in the cred struct. 1652 */ 1653 int 1654 nfs_getreq(nd, nfsd, has_header) 1655 struct nfsrv_descript *nd; 1656 struct nfsd *nfsd; 1657 int has_header; 1658 { 1659 int len, i; 1660 u_int32_t *tl; 1661 int32_t t1; 1662 struct uio uio; 1663 struct iovec iov; 1664 caddr_t dpos, cp2, cp; 1665 u_int32_t nfsvers, auth_type; 1666 uid_t nickuid; 1667 int error = 0, nqnfs = 0, ticklen; 1668 struct mbuf *mrep, *md; 1669 struct nfsuid *nuidp; 1670 struct timeval tvin, tvout; 1671 1672 mrep = nd->nd_mrep; 1673 md = nd->nd_md; 1674 dpos = nd->nd_dpos; 1675 if (has_header) { 1676 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1677 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1678 if (*tl++ != rpc_call) { 1679 m_freem(mrep); 1680 return (EBADRPC); 1681 } 1682 } else 1683 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1684 nd->nd_repstat = 0; 1685 nd->nd_flag = 0; 1686 if (*tl++ != rpc_vers) { 1687 nd->nd_repstat = ERPCMISMATCH; 1688 nd->nd_procnum = NFSPROC_NOOP; 1689 return (0); 1690 } 1691 if (*tl != nfs_prog) { 1692 if (*tl == nqnfs_prog) 1693 nqnfs++; 1694 else { 1695 nd->nd_repstat = EPROGUNAVAIL; 1696 nd->nd_procnum = NFSPROC_NOOP; 1697 return (0); 1698 } 1699 } 1700 tl++; 1701 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1702 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1703 (nfsvers != NQNFS_VER3 && nqnfs)) { 1704 nd->nd_repstat = EPROGMISMATCH; 1705 nd->nd_procnum = NFSPROC_NOOP; 1706 return (0); 1707 } 1708 if (nqnfs) 1709 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1710 else if (nfsvers == NFS_VER3) 1711 nd->nd_flag = ND_NFSV3; 1712 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1713 if (nd->nd_procnum == NFSPROC_NULL) 1714 return (0); 1715 if (nd->nd_procnum >= NFS_NPROCS || 1716 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1717 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1718 nd->nd_repstat = EPROCUNAVAIL; 1719 nd->nd_procnum = NFSPROC_NOOP; 1720 return (0); 1721 } 1722 if ((nd->nd_flag & ND_NFSV3) == 0) 1723 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1724 auth_type = *tl++; 1725 len = fxdr_unsigned(int, *tl++); 1726 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1727 m_freem(mrep); 1728 return (EBADRPC); 1729 } 1730 1731 nd->nd_flag &= ~ND_KERBAUTH; 1732 /* 1733 * Handle auth_unix or auth_kerb. 1734 */ 1735 if (auth_type == rpc_auth_unix) { 1736 len = fxdr_unsigned(int, *++tl); 1737 if (len < 0 || len > NFS_MAXNAMLEN) { 1738 m_freem(mrep); 1739 return (EBADRPC); 1740 } 1741 nfsm_adv(nfsm_rndup(len)); 1742 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1743 memset((caddr_t)&nd->nd_cr, 0, sizeof (struct ucred)); 1744 nd->nd_cr.cr_ref = 1; 1745 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1746 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1747 len = fxdr_unsigned(int, *tl); 1748 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1749 m_freem(mrep); 1750 return (EBADRPC); 1751 } 1752 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1753 for (i = 0; i < len; i++) 1754 if (i < NGROUPS) 1755 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1756 else 1757 tl++; 1758 nd->nd_cr.cr_ngroups = (len > NGROUPS) ? NGROUPS : len; 1759 if (nd->nd_cr.cr_ngroups > 1) 1760 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1761 len = fxdr_unsigned(int, *++tl); 1762 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1763 m_freem(mrep); 1764 return (EBADRPC); 1765 } 1766 if (len > 0) 1767 nfsm_adv(nfsm_rndup(len)); 1768 } else if (auth_type == rpc_auth_kerb) { 1769 switch (fxdr_unsigned(int, *tl++)) { 1770 case RPCAKN_FULLNAME: 1771 ticklen = fxdr_unsigned(int, *tl); 1772 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1773 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1774 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1775 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1776 m_freem(mrep); 1777 return (EBADRPC); 1778 } 1779 uio.uio_offset = 0; 1780 uio.uio_iov = &iov; 1781 uio.uio_iovcnt = 1; 1782 uio.uio_segflg = UIO_SYSSPACE; 1783 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1784 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1785 nfsm_mtouio(&uio, uio.uio_resid); 1786 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1787 if (*tl++ != rpc_auth_kerb || 1788 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1789 printf("Bad kerb verifier\n"); 1790 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1791 nd->nd_procnum = NFSPROC_NOOP; 1792 return (0); 1793 } 1794 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1795 tl = (u_int32_t *)cp; 1796 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1797 printf("Not fullname kerb verifier\n"); 1798 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1799 nd->nd_procnum = NFSPROC_NOOP; 1800 return (0); 1801 } 1802 cp += NFSX_UNSIGNED; 1803 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 1804 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1805 nd->nd_flag |= ND_KERBFULL; 1806 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1807 break; 1808 case RPCAKN_NICKNAME: 1809 if (len != 2 * NFSX_UNSIGNED) { 1810 printf("Kerb nickname short\n"); 1811 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1812 nd->nd_procnum = NFSPROC_NOOP; 1813 return (0); 1814 } 1815 nickuid = fxdr_unsigned(uid_t, *tl); 1816 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1817 if (*tl++ != rpc_auth_kerb || 1818 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1819 printf("Kerb nick verifier bad\n"); 1820 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1821 nd->nd_procnum = NFSPROC_NOOP; 1822 return (0); 1823 } 1824 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1825 tvin.tv_sec = *tl++; 1826 tvin.tv_usec = *tl; 1827 1828 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 1829 nu_hash) { 1830 if (nuidp->nu_cr.cr_uid == nickuid && 1831 (!nd->nd_nam2 || 1832 netaddr_match(NU_NETFAM(nuidp), 1833 &nuidp->nu_haddr, nd->nd_nam2))) 1834 break; 1835 } 1836 if (!nuidp) { 1837 nd->nd_repstat = 1838 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1839 nd->nd_procnum = NFSPROC_NOOP; 1840 return (0); 1841 } 1842 1843 /* 1844 * Now, decrypt the timestamp using the session key 1845 * and validate it. 1846 */ 1847 #ifdef NFSKERB 1848 XXX 1849 #endif 1850 1851 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1852 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1853 if (nuidp->nu_expire < time.tv_sec || 1854 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1855 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1856 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1857 nuidp->nu_expire = 0; 1858 nd->nd_repstat = 1859 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1860 nd->nd_procnum = NFSPROC_NOOP; 1861 return (0); 1862 } 1863 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1864 nd->nd_flag |= ND_KERBNICK; 1865 }; 1866 } else { 1867 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1868 nd->nd_procnum = NFSPROC_NOOP; 1869 return (0); 1870 } 1871 1872 /* 1873 * For nqnfs, get piggybacked lease request. 1874 */ 1875 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1876 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1877 nd->nd_flag |= fxdr_unsigned(int, *tl); 1878 if (nd->nd_flag & ND_LEASE) { 1879 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1880 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 1881 } else 1882 nd->nd_duration = NQ_MINLEASE; 1883 } else 1884 nd->nd_duration = NQ_MINLEASE; 1885 nd->nd_md = md; 1886 nd->nd_dpos = dpos; 1887 return (0); 1888 nfsmout: 1889 return (error); 1890 } 1891 1892 int 1893 nfs_msg(p, server, msg) 1894 struct proc *p; 1895 char *server, *msg; 1896 { 1897 tpr_t tpr; 1898 1899 if (p) 1900 tpr = tprintf_open(p); 1901 else 1902 tpr = NULL; 1903 tprintf(tpr, "nfs server %s: %s\n", server, msg); 1904 tprintf_close(tpr); 1905 return (0); 1906 } 1907 1908 #ifdef NFSSERVER 1909 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 1910 struct nfssvc_sock *, struct proc *, 1911 struct mbuf **)) = { 1912 nfsrv_null, 1913 nfsrv_getattr, 1914 nfsrv_setattr, 1915 nfsrv_lookup, 1916 nfsrv3_access, 1917 nfsrv_readlink, 1918 nfsrv_read, 1919 nfsrv_write, 1920 nfsrv_create, 1921 nfsrv_mkdir, 1922 nfsrv_symlink, 1923 nfsrv_mknod, 1924 nfsrv_remove, 1925 nfsrv_rmdir, 1926 nfsrv_rename, 1927 nfsrv_link, 1928 nfsrv_readdir, 1929 nfsrv_readdirplus, 1930 nfsrv_statfs, 1931 nfsrv_fsinfo, 1932 nfsrv_pathconf, 1933 nfsrv_commit, 1934 nqnfsrv_getlease, 1935 nqnfsrv_vacated, 1936 nfsrv_noop, 1937 nfsrv_noop 1938 }; 1939 1940 /* 1941 * Socket upcall routine for the nfsd sockets. 1942 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1943 * Essentially do as much as possible non-blocking, else punt and it will 1944 * be called with M_WAIT from an nfsd. 1945 */ 1946 void 1947 nfsrv_rcv(so, arg, waitflag) 1948 struct socket *so; 1949 caddr_t arg; 1950 int waitflag; 1951 { 1952 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1953 struct mbuf *m; 1954 struct mbuf *mp, *nam; 1955 struct uio auio; 1956 int flags, error; 1957 1958 if ((slp->ns_flag & SLP_VALID) == 0) 1959 return; 1960 #ifdef notdef 1961 /* 1962 * Define this to test for nfsds handling this under heavy load. 1963 */ 1964 if (waitflag == M_DONTWAIT) { 1965 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 1966 } 1967 #endif 1968 auio.uio_procp = NULL; 1969 if (so->so_type == SOCK_STREAM) { 1970 /* 1971 * If there are already records on the queue, defer soreceive() 1972 * to an nfsd so that there is feedback to the TCP layer that 1973 * the nfs servers are heavily loaded. 1974 */ 1975 if (slp->ns_rec && waitflag == M_DONTWAIT) { 1976 slp->ns_flag |= SLP_NEEDQ; 1977 goto dorecs; 1978 } 1979 1980 /* 1981 * Do soreceive(). 1982 */ 1983 auio.uio_resid = 1000000000; 1984 flags = MSG_DONTWAIT; 1985 error = (*so->so_receive)(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 1986 if (error || mp == (struct mbuf *)0) { 1987 if (error == EWOULDBLOCK) 1988 slp->ns_flag |= SLP_NEEDQ; 1989 else 1990 slp->ns_flag |= SLP_DISCONN; 1991 goto dorecs; 1992 } 1993 m = mp; 1994 if (slp->ns_rawend) { 1995 slp->ns_rawend->m_next = m; 1996 slp->ns_cc += 1000000000 - auio.uio_resid; 1997 } else { 1998 slp->ns_raw = m; 1999 slp->ns_cc = 1000000000 - auio.uio_resid; 2000 } 2001 while (m->m_next) 2002 m = m->m_next; 2003 slp->ns_rawend = m; 2004 2005 /* 2006 * Now try and parse record(s) out of the raw stream data. 2007 */ 2008 error = nfsrv_getstream(slp, waitflag); 2009 if (error) { 2010 if (error == EPERM) 2011 slp->ns_flag |= SLP_DISCONN; 2012 else 2013 slp->ns_flag |= SLP_NEEDQ; 2014 } 2015 } else { 2016 do { 2017 auio.uio_resid = 1000000000; 2018 flags = MSG_DONTWAIT; 2019 error = (*so->so_receive)(so, &nam, &auio, &mp, 2020 (struct mbuf **)0, &flags); 2021 if (mp) { 2022 if (nam) { 2023 m = nam; 2024 m->m_next = mp; 2025 } else 2026 m = mp; 2027 if (slp->ns_recend) 2028 slp->ns_recend->m_nextpkt = m; 2029 else 2030 slp->ns_rec = m; 2031 slp->ns_recend = m; 2032 m->m_nextpkt = (struct mbuf *)0; 2033 } 2034 if (error) { 2035 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2036 && error != EWOULDBLOCK) { 2037 slp->ns_flag |= SLP_DISCONN; 2038 goto dorecs; 2039 } 2040 } 2041 } while (mp); 2042 } 2043 2044 /* 2045 * Now try and process the request records, non-blocking. 2046 */ 2047 dorecs: 2048 if (waitflag == M_DONTWAIT && 2049 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2050 nfsrv_wakenfsd(slp); 2051 } 2052 2053 /* 2054 * Try and extract an RPC request from the mbuf data list received on a 2055 * stream socket. The "waitflag" argument indicates whether or not it 2056 * can sleep. 2057 */ 2058 int 2059 nfsrv_getstream(slp, waitflag) 2060 struct nfssvc_sock *slp; 2061 int waitflag; 2062 { 2063 struct mbuf *m, **mpp; 2064 struct mbuf *recm; 2065 u_int32_t recmark; 2066 2067 if (slp->ns_flag & SLP_GETSTREAM) 2068 panic("nfs getstream"); 2069 slp->ns_flag |= SLP_GETSTREAM; 2070 for (;;) { 2071 if (slp->ns_reclen == 0) { 2072 if (slp->ns_cc < NFSX_UNSIGNED) { 2073 slp->ns_flag &= ~SLP_GETSTREAM; 2074 return (0); 2075 } 2076 m = slp->ns_raw; 2077 m_copydata(m, 0, NFSX_UNSIGNED, (caddr_t)&recmark); 2078 m_adj(m, NFSX_UNSIGNED); 2079 slp->ns_cc -= NFSX_UNSIGNED; 2080 recmark = ntohl(recmark); 2081 slp->ns_reclen = recmark & ~0x80000000; 2082 if (recmark & 0x80000000) 2083 slp->ns_flag |= SLP_LASTFRAG; 2084 else 2085 slp->ns_flag &= ~SLP_LASTFRAG; 2086 if (slp->ns_reclen > NFS_MAXPACKET) { 2087 slp->ns_flag &= ~SLP_GETSTREAM; 2088 return (EPERM); 2089 } 2090 } 2091 2092 /* 2093 * Now get the record part. 2094 * 2095 * Note that slp->ns_reclen may be 0. Linux sometimes 2096 * generates 0-length records. 2097 */ 2098 if (slp->ns_cc == slp->ns_reclen) { 2099 recm = slp->ns_raw; 2100 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2101 slp->ns_cc = slp->ns_reclen = 0; 2102 } else if (slp->ns_cc > slp->ns_reclen) { 2103 recm = slp->ns_raw; 2104 m = m_split(recm, slp->ns_reclen, waitflag); 2105 if (m == NULL) { 2106 slp->ns_flag &= ~SLP_GETSTREAM; 2107 return (EWOULDBLOCK); 2108 } 2109 m_claim(recm, &nfs_mowner); 2110 slp->ns_raw = m; 2111 if (m->m_next == NULL) 2112 slp->ns_rawend = m; 2113 slp->ns_cc -= slp->ns_reclen; 2114 slp->ns_reclen = 0; 2115 } else { 2116 slp->ns_flag &= ~SLP_GETSTREAM; 2117 return (0); 2118 } 2119 2120 /* 2121 * Accumulate the fragments into a record. 2122 */ 2123 mpp = &slp->ns_frag; 2124 while (*mpp) 2125 mpp = &((*mpp)->m_next); 2126 *mpp = recm; 2127 if (slp->ns_flag & SLP_LASTFRAG) { 2128 if (slp->ns_recend) 2129 slp->ns_recend->m_nextpkt = slp->ns_frag; 2130 else 2131 slp->ns_rec = slp->ns_frag; 2132 slp->ns_recend = slp->ns_frag; 2133 slp->ns_frag = (struct mbuf *)0; 2134 } 2135 } 2136 } 2137 2138 /* 2139 * Parse an RPC header. 2140 */ 2141 int 2142 nfsrv_dorec(slp, nfsd, ndp) 2143 struct nfssvc_sock *slp; 2144 struct nfsd *nfsd; 2145 struct nfsrv_descript **ndp; 2146 { 2147 struct mbuf *m, *nam; 2148 struct nfsrv_descript *nd; 2149 int error; 2150 2151 *ndp = NULL; 2152 if ((slp->ns_flag & SLP_VALID) == 0 || 2153 (m = slp->ns_rec) == (struct mbuf *)0) 2154 return (ENOBUFS); 2155 slp->ns_rec = m->m_nextpkt; 2156 if (slp->ns_rec) 2157 m->m_nextpkt = (struct mbuf *)0; 2158 else 2159 slp->ns_recend = (struct mbuf *)0; 2160 if (m->m_type == MT_SONAME) { 2161 nam = m; 2162 m = m->m_next; 2163 nam->m_next = NULL; 2164 } else 2165 nam = NULL; 2166 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2167 M_NFSRVDESC, M_WAITOK); 2168 nd->nd_md = nd->nd_mrep = m; 2169 nd->nd_nam2 = nam; 2170 nd->nd_dpos = mtod(m, caddr_t); 2171 error = nfs_getreq(nd, nfsd, TRUE); 2172 if (error) { 2173 m_freem(nam); 2174 free((caddr_t)nd, M_NFSRVDESC); 2175 return (error); 2176 } 2177 *ndp = nd; 2178 nfsd->nfsd_nd = nd; 2179 return (0); 2180 } 2181 2182 2183 /* 2184 * Search for a sleeping nfsd and wake it up. 2185 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2186 * running nfsds will go look for the work in the nfssvc_sock list. 2187 */ 2188 void 2189 nfsrv_wakenfsd(slp) 2190 struct nfssvc_sock *slp; 2191 { 2192 struct nfsd *nd; 2193 2194 if ((slp->ns_flag & SLP_VALID) == 0) 2195 return; 2196 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) { 2197 if (nd->nfsd_flag & NFSD_WAITING) { 2198 nd->nfsd_flag &= ~NFSD_WAITING; 2199 if (nd->nfsd_slp) 2200 panic("nfsd wakeup"); 2201 slp->ns_sref++; 2202 nd->nfsd_slp = slp; 2203 wakeup((caddr_t)nd); 2204 return; 2205 } 2206 } 2207 slp->ns_flag |= SLP_DOREC; 2208 nfsd_head_flag |= NFSD_CHECKSLP; 2209 } 2210 #endif /* NFSSERVER */ 2211