Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/nfs/nfs_socket.c
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1 /* $NetBSD: nfs_socket.c,v 1.112.2.2 2005/12/15 20:22:16 tron 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. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 35 */ 36 37 /* 38 * Socket operations for use by nfs 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_socket.c,v 1.112.2.2 2005/12/15 20:22:16 tron Exp $"); 43 44 #include "fs_nfs.h" 45 #include "opt_nfs.h" 46 #include "opt_nfsserver.h" 47 #include "opt_mbuftrace.h" 48 #include "opt_inet.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/callout.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/kernel.h> 56 #include <sys/mbuf.h> 57 #include <sys/vnode.h> 58 #include <sys/domain.h> 59 #include <sys/protosw.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/syslog.h> 63 #include <sys/tprintf.h> 64 #include <sys/namei.h> 65 #include <sys/signal.h> 66 #include <sys/signalvar.h> 67 68 #include <netinet/in.h> 69 #include <netinet/tcp.h> 70 71 #include <nfs/rpcv2.h> 72 #include <nfs/nfsproto.h> 73 #include <nfs/nfs.h> 74 #include <nfs/xdr_subs.h> 75 #include <nfs/nfsm_subs.h> 76 #include <nfs/nfsmount.h> 77 #include <nfs/nfsnode.h> 78 #include <nfs/nfsrtt.h> 79 #include <nfs/nqnfs.h> 80 #include <nfs/nfs_var.h> 81 82 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 83 #ifdef MBUFTRACE 84 struct mowner nfs_mowner = { "nfs" }; 85 #endif 86 87 /* 88 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 89 * Use the mean and mean deviation of rtt for the appropriate type of rpc 90 * for the frequent rpcs and a default for the others. 91 * The justification for doing "other" this way is that these rpcs 92 * happen so infrequently that timer est. would probably be stale. 93 * Also, since many of these rpcs are 94 * non-idempotent, a conservative timeout is desired. 95 * getattr, lookup - A+2D 96 * read, write - A+4D 97 * other - nm_timeo 98 */ 99 #define NFS_RTO(n, t) \ 100 ((t) == 0 ? (n)->nm_timeo : \ 101 ((t) < 3 ? \ 102 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 103 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 104 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 105 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 106 /* 107 * External data, mostly RPC constants in XDR form 108 */ 109 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 110 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 111 rpc_auth_kerb; 112 extern u_int32_t nfs_prog, nqnfs_prog; 113 extern time_t nqnfsstarttime; 114 extern const int nfsv3_procid[NFS_NPROCS]; 115 extern int nfs_ticks; 116 117 /* 118 * Defines which timer to use for the procnum. 119 * 0 - default 120 * 1 - getattr 121 * 2 - lookup 122 * 3 - read 123 * 4 - write 124 */ 125 static const int proct[NFS_NPROCS] = { 126 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 127 0, 0, 0, 128 }; 129 130 /* 131 * There is a congestion window for outstanding rpcs maintained per mount 132 * point. The cwnd size is adjusted in roughly the way that: 133 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 134 * SIGCOMM '88". ACM, August 1988. 135 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 136 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 137 * of rpcs is in progress. 138 * (The sent count and cwnd are scaled for integer arith.) 139 * Variants of "slow start" were tried and were found to be too much of a 140 * performance hit (ave. rtt 3 times larger), 141 * I suspect due to the large rtt that nfs rpcs have. 142 */ 143 #define NFS_CWNDSCALE 256 144 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 145 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 146 int nfsrtton = 0; 147 struct nfsrtt nfsrtt; 148 struct nfsreqhead nfs_reqq; 149 150 struct callout nfs_timer_ch = CALLOUT_INITIALIZER_SETFUNC(nfs_timer, NULL); 151 152 /* 153 * Initialize sockets and congestion for a new NFS connection. 154 * We do not free the sockaddr if error. 155 */ 156 int 157 nfs_connect(nmp, rep, p) 158 struct nfsmount *nmp; 159 struct nfsreq *rep; 160 struct proc *p; 161 { 162 struct socket *so; 163 int s, error, rcvreserve, sndreserve; 164 struct sockaddr *saddr; 165 struct sockaddr_in *sin; 166 #ifdef INET6 167 struct sockaddr_in6 *sin6; 168 #endif 169 struct mbuf *m; 170 171 nmp->nm_so = (struct socket *)0; 172 saddr = mtod(nmp->nm_nam, struct sockaddr *); 173 error = socreate(saddr->sa_family, &nmp->nm_so, 174 nmp->nm_sotype, nmp->nm_soproto, p); 175 if (error) 176 goto bad; 177 so = nmp->nm_so; 178 #ifdef MBUFTRACE 179 so->so_mowner = &nfs_mowner; 180 so->so_rcv.sb_mowner = &nfs_mowner; 181 so->so_snd.sb_mowner = &nfs_mowner; 182 #endif 183 nmp->nm_soflags = so->so_proto->pr_flags; 184 185 /* 186 * Some servers require that the client port be a reserved port number. 187 */ 188 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 189 m = m_get(M_WAIT, MT_SOOPTS); 190 MCLAIM(m, so->so_mowner); 191 *mtod(m, int32_t *) = IP_PORTRANGE_LOW; 192 m->m_len = sizeof(int32_t); 193 if ((error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, m))) 194 goto bad; 195 m = m_get(M_WAIT, MT_SONAME); 196 MCLAIM(m, so->so_mowner); 197 sin = mtod(m, struct sockaddr_in *); 198 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 199 sin->sin_family = AF_INET; 200 sin->sin_addr.s_addr = INADDR_ANY; 201 sin->sin_port = 0; 202 error = sobind(so, m, &proc0); 203 m_freem(m); 204 if (error) 205 goto bad; 206 } 207 #ifdef INET6 208 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 209 m = m_get(M_WAIT, MT_SOOPTS); 210 MCLAIM(m, so->so_mowner); 211 *mtod(m, int32_t *) = IPV6_PORTRANGE_LOW; 212 m->m_len = sizeof(int32_t); 213 if ((error = sosetopt(so, IPPROTO_IPV6, IPV6_PORTRANGE, m))) 214 goto bad; 215 m = m_get(M_WAIT, MT_SONAME); 216 MCLAIM(m, so->so_mowner); 217 sin6 = mtod(m, struct sockaddr_in6 *); 218 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 219 sin6->sin6_family = AF_INET6; 220 sin6->sin6_addr = in6addr_any; 221 sin6->sin6_port = 0; 222 error = sobind(so, m, &proc0); 223 m_freem(m); 224 if (error) 225 goto bad; 226 } 227 #endif 228 229 /* 230 * Protocols that do not require connections may be optionally left 231 * unconnected for servers that reply from a port other than NFS_PORT. 232 */ 233 if (nmp->nm_flag & NFSMNT_NOCONN) { 234 if (nmp->nm_soflags & PR_CONNREQUIRED) { 235 error = ENOTCONN; 236 goto bad; 237 } 238 } else { 239 error = soconnect(so, nmp->nm_nam, p); 240 if (error) 241 goto bad; 242 243 /* 244 * Wait for the connection to complete. Cribbed from the 245 * connect system call but with the wait timing out so 246 * that interruptible mounts don't hang here for a long time. 247 */ 248 s = splsoftnet(); 249 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 250 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 251 "nfscn1", 2 * hz); 252 if ((so->so_state & SS_ISCONNECTING) && 253 so->so_error == 0 && rep && 254 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 255 so->so_state &= ~SS_ISCONNECTING; 256 splx(s); 257 goto bad; 258 } 259 } 260 if (so->so_error) { 261 error = so->so_error; 262 so->so_error = 0; 263 splx(s); 264 goto bad; 265 } 266 splx(s); 267 } 268 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 269 so->so_rcv.sb_timeo = (5 * hz); 270 so->so_snd.sb_timeo = (5 * hz); 271 } else { 272 /* 273 * enable receive timeout to detect server crash and reconnect. 274 * otherwise, we can be stuck in soreceive forever. 275 */ 276 so->so_rcv.sb_timeo = (5 * hz); 277 so->so_snd.sb_timeo = 0; 278 } 279 if (nmp->nm_sotype == SOCK_DGRAM) { 280 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 281 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 282 NFS_MAXPKTHDR) * 2; 283 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 284 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 285 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 286 NFS_MAXPKTHDR) * 2; 287 } else { 288 if (nmp->nm_sotype != SOCK_STREAM) 289 panic("nfscon sotype"); 290 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 291 m = m_get(M_WAIT, MT_SOOPTS); 292 MCLAIM(m, so->so_mowner); 293 *mtod(m, int32_t *) = 1; 294 m->m_len = sizeof(int32_t); 295 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 296 } 297 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 298 m = m_get(M_WAIT, MT_SOOPTS); 299 MCLAIM(m, so->so_mowner); 300 *mtod(m, int32_t *) = 1; 301 m->m_len = sizeof(int32_t); 302 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 303 } 304 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 305 sizeof (u_int32_t)) * 2; 306 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 307 sizeof (u_int32_t)) * 2; 308 } 309 error = soreserve(so, sndreserve, rcvreserve); 310 if (error) 311 goto bad; 312 so->so_rcv.sb_flags |= SB_NOINTR; 313 so->so_snd.sb_flags |= SB_NOINTR; 314 315 /* Initialize other non-zero congestion variables */ 316 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 317 NFS_TIMEO << 3; 318 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 319 nmp->nm_sdrtt[3] = 0; 320 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 321 nmp->nm_sent = 0; 322 nmp->nm_timeouts = 0; 323 return (0); 324 325 bad: 326 nfs_disconnect(nmp); 327 return (error); 328 } 329 330 /* 331 * Reconnect routine: 332 * Called when a connection is broken on a reliable protocol. 333 * - clean up the old socket 334 * - nfs_connect() again 335 * - set R_MUSTRESEND for all outstanding requests on mount point 336 * If this fails the mount point is DEAD! 337 * nb: Must be called with the nfs_sndlock() set on the mount point. 338 */ 339 int 340 nfs_reconnect(rep, p) 341 struct nfsreq *rep; 342 struct proc *p; 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, p)) != 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 if ((rp->r_flags & R_MUSTRESEND) == 0) 362 rp->r_flags |= R_MUSTRESEND | R_REXMITTED; 363 rp->r_rexmit = 0; 364 } 365 } 366 return (0); 367 } 368 369 /* 370 * NFS disconnect. Clean up and unlink. 371 */ 372 void 373 nfs_disconnect(nmp) 374 struct nfsmount *nmp; 375 { 376 struct socket *so; 377 int drain = 0; 378 379 if (nmp->nm_so) { 380 so = nmp->nm_so; 381 nmp->nm_so = (struct socket *)0; 382 soshutdown(so, 2); 383 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 384 if (drain) { 385 /* 386 * soshutdown() above should wake up the current 387 * listener. 388 * Now wake up those waiting for the receive lock, and 389 * wait for them to go away unhappy, to prevent *nmp 390 * from evaporating while they're sleeping. 391 */ 392 while (nmp->nm_waiters > 0) { 393 wakeup (&nmp->nm_iflag); 394 (void) tsleep(&nmp->nm_waiters, PVFS, 395 "nfsdis", 0); 396 } 397 } 398 soclose(so); 399 } 400 #ifdef DIAGNOSTIC 401 if (drain && (nmp->nm_waiters > 0)) 402 panic("nfs_disconnect: waiters left after drain?"); 403 #endif 404 } 405 406 void 407 nfs_safedisconnect(nmp) 408 struct nfsmount *nmp; 409 { 410 struct nfsreq dummyreq; 411 412 memset(&dummyreq, 0, sizeof(dummyreq)); 413 dummyreq.r_nmp = nmp; 414 nfs_rcvlock(&dummyreq); /* XXX ignored error return */ 415 nfs_disconnect(nmp); 416 nfs_rcvunlock(nmp); 417 } 418 419 /* 420 * This is the nfs send routine. For connection based socket types, it 421 * must be called with an nfs_sndlock() on the socket. 422 * "rep == NULL" indicates that it has been called from a server. 423 * For the client side: 424 * - return EINTR if the RPC is terminated, 0 otherwise 425 * - set R_MUSTRESEND if the send fails for any reason 426 * - do any cleanup required by recoverable socket errors (? ? ?) 427 * For the server side: 428 * - return EINTR or ERESTART if interrupted by a signal 429 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 430 * - do any cleanup required by recoverable socket errors (? ? ?) 431 */ 432 int 433 nfs_send(so, nam, top, rep, p) 434 struct socket *so; 435 struct mbuf *nam; 436 struct mbuf *top; 437 struct nfsreq *rep; 438 struct proc *p; 439 { 440 struct mbuf *sendnam; 441 int error, soflags, flags; 442 443 /* XXX nfs_doio()/nfs_request() calls with rep->r_procp == NULL */ 444 if (p == NULL && rep->r_procp == NULL) 445 p = curproc; 446 447 if (rep) { 448 if (rep->r_flags & R_SOFTTERM) { 449 m_freem(top); 450 return (EINTR); 451 } 452 if ((so = rep->r_nmp->nm_so) == NULL) { 453 rep->r_flags |= R_MUSTRESEND; 454 m_freem(top); 455 return (0); 456 } 457 rep->r_flags &= ~R_MUSTRESEND; 458 soflags = rep->r_nmp->nm_soflags; 459 } else 460 soflags = so->so_proto->pr_flags; 461 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 462 sendnam = (struct mbuf *)0; 463 else 464 sendnam = nam; 465 if (so->so_type == SOCK_SEQPACKET) 466 flags = MSG_EOR; 467 else 468 flags = 0; 469 470 error = (*so->so_send)(so, sendnam, (struct uio *)0, top, 471 (struct mbuf *)0, flags, p); 472 if (error) { 473 if (rep) { 474 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 475 /* 476 * We're too fast for the network/driver, 477 * and UDP isn't flowcontrolled. 478 * We need to resend. This is not fatal, 479 * just try again. 480 * 481 * Could be smarter here by doing some sort 482 * of a backoff, but this is rare. 483 */ 484 rep->r_flags |= R_MUSTRESEND; 485 } else { 486 if (error != EPIPE) 487 log(LOG_INFO, 488 "nfs send error %d for %s\n", 489 error, 490 rep->r_nmp->nm_mountp-> 491 mnt_stat.f_mntfromname); 492 /* 493 * Deal with errors for the client side. 494 */ 495 if (rep->r_flags & R_SOFTTERM) 496 error = EINTR; 497 else 498 rep->r_flags |= R_MUSTRESEND; 499 } 500 } else { 501 /* 502 * See above. This error can happen under normal 503 * circumstances and the log is too noisy. 504 * The error will still show up in nfsstat. 505 */ 506 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 507 log(LOG_INFO, "nfsd send error %d\n", error); 508 } 509 510 /* 511 * Handle any recoverable (soft) socket errors here. (? ? ?) 512 */ 513 if (error != EINTR && error != ERESTART && 514 error != EWOULDBLOCK && error != EPIPE) 515 error = 0; 516 } 517 return (error); 518 } 519 520 #ifdef NFS 521 /* 522 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 523 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 524 * Mark and consolidate the data into a new mbuf list. 525 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 526 * small mbufs. 527 * For SOCK_STREAM we must be very careful to read an entire record once 528 * we have read any of it, even if the system call has been interrupted. 529 */ 530 int 531 nfs_receive(rep, aname, mp, p) 532 struct nfsreq *rep; 533 struct mbuf **aname; 534 struct mbuf **mp; 535 struct proc *p; 536 { 537 struct socket *so; 538 struct uio auio; 539 struct iovec aio; 540 struct mbuf *m; 541 struct mbuf *control; 542 u_int32_t len; 543 struct mbuf **getnam; 544 int error, sotype, rcvflg; 545 546 /* 547 * Set up arguments for soreceive() 548 */ 549 *mp = (struct mbuf *)0; 550 *aname = (struct mbuf *)0; 551 sotype = rep->r_nmp->nm_sotype; 552 553 /* 554 * For reliable protocols, lock against other senders/receivers 555 * in case a reconnect is necessary. 556 * For SOCK_STREAM, first get the Record Mark to find out how much 557 * more there is to get. 558 * We must lock the socket against other receivers 559 * until we have an entire rpc request/reply. 560 */ 561 if (sotype != SOCK_DGRAM) { 562 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 563 if (error) 564 return (error); 565 tryagain: 566 /* 567 * Check for fatal errors and resending request. 568 */ 569 /* 570 * Ugh: If a reconnect attempt just happened, nm_so 571 * would have changed. NULL indicates a failed 572 * attempt that has essentially shut down this 573 * mount point. 574 */ 575 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 576 nfs_sndunlock(&rep->r_nmp->nm_iflag); 577 return (EINTR); 578 } 579 so = rep->r_nmp->nm_so; 580 if (!so) { 581 error = nfs_reconnect(rep, p); 582 if (error) { 583 nfs_sndunlock(&rep->r_nmp->nm_iflag); 584 return (error); 585 } 586 goto tryagain; 587 } 588 while (rep->r_flags & R_MUSTRESEND) { 589 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 590 nfsstats.rpcretries++; 591 rep->r_rtt = 0; 592 rep->r_flags &= ~R_TIMING; 593 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, p); 594 if (error) { 595 if (error == EINTR || error == ERESTART || 596 (error = nfs_reconnect(rep, p)) != 0) { 597 nfs_sndunlock(&rep->r_nmp->nm_iflag); 598 return (error); 599 } 600 goto tryagain; 601 } 602 } 603 nfs_sndunlock(&rep->r_nmp->nm_iflag); 604 if (sotype == SOCK_STREAM) { 605 aio.iov_base = (caddr_t) &len; 606 aio.iov_len = sizeof(u_int32_t); 607 auio.uio_iov = &aio; 608 auio.uio_iovcnt = 1; 609 auio.uio_segflg = UIO_SYSSPACE; 610 auio.uio_rw = UIO_READ; 611 auio.uio_offset = 0; 612 auio.uio_resid = sizeof(u_int32_t); 613 auio.uio_procp = NULL; 614 do { 615 rcvflg = MSG_WAITALL; 616 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 617 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 618 if (error == EWOULDBLOCK && rep) { 619 if (rep->r_flags & R_SOFTTERM) 620 return (EINTR); 621 /* 622 * if it seems that the server died after it 623 * received our request, set EPIPE so that 624 * we'll reconnect and retransmit requests. 625 */ 626 if (rep->r_rexmit >= rep->r_nmp->nm_retry) { 627 nfsstats.rpctimeouts++; 628 error = EPIPE; 629 } 630 } 631 } while (error == EWOULDBLOCK); 632 if (!error && auio.uio_resid > 0) { 633 /* 634 * Don't log a 0 byte receive; it means 635 * that the socket has been closed, and 636 * can happen during normal operation 637 * (forcible unmount or Solaris server). 638 */ 639 if (auio.uio_resid != sizeof (u_int32_t)) 640 log(LOG_INFO, 641 "short receive (%lu/%lu) from nfs server %s\n", 642 (u_long)sizeof(u_int32_t) - auio.uio_resid, 643 (u_long)sizeof(u_int32_t), 644 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 645 error = EPIPE; 646 } 647 if (error) 648 goto errout; 649 len = ntohl(len) & ~0x80000000; 650 /* 651 * This is SERIOUS! We are out of sync with the sender 652 * and forcing a disconnect/reconnect is all I can do. 653 */ 654 if (len > NFS_MAXPACKET) { 655 log(LOG_ERR, "%s (%d) from nfs server %s\n", 656 "impossible packet length", 657 len, 658 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 659 error = EFBIG; 660 goto errout; 661 } 662 auio.uio_resid = len; 663 do { 664 rcvflg = MSG_WAITALL; 665 error = (*so->so_receive)(so, (struct mbuf **)0, 666 &auio, mp, (struct mbuf **)0, &rcvflg); 667 } while (error == EWOULDBLOCK || error == EINTR || 668 error == ERESTART); 669 if (!error && auio.uio_resid > 0) { 670 if (len != auio.uio_resid) 671 log(LOG_INFO, 672 "short receive (%lu/%d) from nfs server %s\n", 673 (u_long)len - auio.uio_resid, len, 674 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 675 error = EPIPE; 676 } 677 } else { 678 /* 679 * NB: Since uio_resid is big, MSG_WAITALL is ignored 680 * and soreceive() will return when it has either a 681 * control msg or a data msg. 682 * We have no use for control msg., but must grab them 683 * and then throw them away so we know what is going 684 * on. 685 */ 686 auio.uio_resid = len = 100000000; /* Anything Big */ 687 auio.uio_procp = p; 688 do { 689 rcvflg = 0; 690 error = (*so->so_receive)(so, (struct mbuf **)0, 691 &auio, mp, &control, &rcvflg); 692 if (control) 693 m_freem(control); 694 if (error == EWOULDBLOCK && rep) { 695 if (rep->r_flags & R_SOFTTERM) 696 return (EINTR); 697 } 698 } while (error == EWOULDBLOCK || 699 (!error && *mp == NULL && control)); 700 if ((rcvflg & MSG_EOR) == 0) 701 printf("Egad!!\n"); 702 if (!error && *mp == NULL) 703 error = EPIPE; 704 len -= auio.uio_resid; 705 } 706 errout: 707 if (error && error != EINTR && error != ERESTART) { 708 m_freem(*mp); 709 *mp = (struct mbuf *)0; 710 if (error != EPIPE) 711 log(LOG_INFO, 712 "receive error %d from nfs server %s\n", 713 error, 714 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 715 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 716 if (!error) 717 error = nfs_reconnect(rep, p); 718 if (!error) 719 goto tryagain; 720 else 721 nfs_sndunlock(&rep->r_nmp->nm_iflag); 722 } 723 } else { 724 if ((so = rep->r_nmp->nm_so) == NULL) 725 return (EACCES); 726 if (so->so_state & SS_ISCONNECTED) 727 getnam = (struct mbuf **)0; 728 else 729 getnam = aname; 730 auio.uio_resid = len = 1000000; 731 auio.uio_procp = p; 732 do { 733 rcvflg = 0; 734 error = (*so->so_receive)(so, getnam, &auio, mp, 735 (struct mbuf **)0, &rcvflg); 736 if (error == EWOULDBLOCK && 737 (rep->r_flags & R_SOFTTERM)) 738 return (EINTR); 739 } while (error == EWOULDBLOCK); 740 len -= auio.uio_resid; 741 if (!error && *mp == NULL) 742 error = EPIPE; 743 } 744 if (error) { 745 m_freem(*mp); 746 *mp = (struct mbuf *)0; 747 } 748 return (error); 749 } 750 751 /* 752 * Implement receipt of reply on a socket. 753 * We must search through the list of received datagrams matching them 754 * with outstanding requests using the xid, until ours is found. 755 */ 756 /* ARGSUSED */ 757 int 758 nfs_reply(myrep, procp) 759 struct nfsreq *myrep; 760 struct proc *procp; 761 { 762 struct nfsreq *rep; 763 struct nfsmount *nmp = myrep->r_nmp; 764 int32_t t1; 765 struct mbuf *mrep, *nam, *md; 766 u_int32_t rxid, *tl; 767 caddr_t dpos, cp2; 768 int error; 769 770 /* 771 * Loop around until we get our own reply 772 */ 773 for (;;) { 774 /* 775 * Lock against other receivers so that I don't get stuck in 776 * sbwait() after someone else has received my reply for me. 777 * Also necessary for connection based protocols to avoid 778 * race conditions during a reconnect. 779 */ 780 error = nfs_rcvlock(myrep); 781 if (error == EALREADY) 782 return (0); 783 if (error) 784 return (error); 785 /* 786 * Get the next Rpc reply off the socket 787 */ 788 nmp->nm_waiters++; 789 error = nfs_receive(myrep, &nam, &mrep, procp); 790 nfs_rcvunlock(nmp); 791 if (error) { 792 793 if (nmp->nm_iflag & NFSMNT_DISMNT) { 794 /* 795 * Oops, we're going away now.. 796 */ 797 nmp->nm_waiters--; 798 wakeup (&nmp->nm_waiters); 799 return error; 800 } 801 nmp->nm_waiters--; 802 /* 803 * Ignore routing errors on connectionless protocols? ? 804 */ 805 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 806 nmp->nm_so->so_error = 0; 807 #ifdef DEBUG 808 printf("nfs_reply: ignoring error %d\n", error); 809 #endif 810 if (myrep->r_flags & R_GETONEREP) 811 return (0); 812 continue; 813 } 814 return (error); 815 } 816 nmp->nm_waiters--; 817 if (nam) 818 m_freem(nam); 819 820 /* 821 * Get the xid and check that it is an rpc reply 822 */ 823 md = mrep; 824 dpos = mtod(md, caddr_t); 825 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 826 rxid = *tl++; 827 if (*tl != rpc_reply) { 828 #ifndef NFS_V2_ONLY 829 if (nmp->nm_flag & NFSMNT_NQNFS) { 830 if (nqnfs_callback(nmp, mrep, md, dpos)) 831 nfsstats.rpcinvalid++; 832 } else 833 #endif 834 { 835 nfsstats.rpcinvalid++; 836 m_freem(mrep); 837 } 838 nfsmout: 839 if (myrep->r_flags & R_GETONEREP) 840 return (0); 841 continue; 842 } 843 844 /* 845 * Loop through the request list to match up the reply 846 * Iff no match, just drop the datagram 847 */ 848 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 849 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 850 /* Found it.. */ 851 rep->r_mrep = mrep; 852 rep->r_md = md; 853 rep->r_dpos = dpos; 854 if (nfsrtton) { 855 struct rttl *rt; 856 857 rt = &nfsrtt.rttl[nfsrtt.pos]; 858 rt->proc = rep->r_procnum; 859 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 860 rt->sent = nmp->nm_sent; 861 rt->cwnd = nmp->nm_cwnd; 862 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 863 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 864 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; 865 rt->tstamp = time; 866 if (rep->r_flags & R_TIMING) 867 rt->rtt = rep->r_rtt; 868 else 869 rt->rtt = 1000000; 870 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 871 } 872 /* 873 * Update congestion window. 874 * Do the additive increase of 875 * one rpc/rtt. 876 */ 877 if (nmp->nm_cwnd <= nmp->nm_sent) { 878 nmp->nm_cwnd += 879 (NFS_CWNDSCALE * NFS_CWNDSCALE + 880 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 881 if (nmp->nm_cwnd > NFS_MAXCWND) 882 nmp->nm_cwnd = NFS_MAXCWND; 883 } 884 rep->r_flags &= ~R_SENT; 885 nmp->nm_sent -= NFS_CWNDSCALE; 886 /* 887 * Update rtt using a gain of 0.125 on the mean 888 * and a gain of 0.25 on the deviation. 889 */ 890 if (rep->r_flags & R_TIMING) { 891 /* 892 * Since the timer resolution of 893 * NFS_HZ is so course, it can often 894 * result in r_rtt == 0. Since 895 * r_rtt == N means that the actual 896 * rtt is between N+dt and N+2-dt ticks, 897 * add 1. 898 */ 899 t1 = rep->r_rtt + 1; 900 t1 -= (NFS_SRTT(rep) >> 3); 901 NFS_SRTT(rep) += t1; 902 if (t1 < 0) 903 t1 = -t1; 904 t1 -= (NFS_SDRTT(rep) >> 2); 905 NFS_SDRTT(rep) += t1; 906 } 907 nmp->nm_timeouts = 0; 908 break; 909 } 910 } 911 /* 912 * If not matched to a request, drop it. 913 * If it's mine, get out. 914 */ 915 if (rep == 0) { 916 nfsstats.rpcunexpected++; 917 m_freem(mrep); 918 } else if (rep == myrep) { 919 if (rep->r_mrep == NULL) 920 panic("nfsreply nil"); 921 return (0); 922 } 923 if (myrep->r_flags & R_GETONEREP) 924 return (0); 925 } 926 } 927 928 /* 929 * nfs_request - goes something like this 930 * - fill in request struct 931 * - links it into list 932 * - calls nfs_send() for first transmit 933 * - calls nfs_receive() to get reply 934 * - break down rpc header and return with nfs reply pointed to 935 * by mrep or error 936 * nb: always frees up mreq mbuf list 937 */ 938 int 939 nfs_request(np, mrest, procnum, procp, cred, mrp, mdp, dposp, rexmitp) 940 struct nfsnode *np; 941 struct mbuf *mrest; 942 int procnum; 943 struct proc *procp; 944 struct ucred *cred; 945 struct mbuf **mrp; 946 struct mbuf **mdp; 947 caddr_t *dposp; 948 int *rexmitp; 949 { 950 struct mbuf *m, *mrep; 951 struct nfsreq *rep; 952 u_int32_t *tl; 953 int i; 954 struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); 955 struct mbuf *md, *mheadend; 956 char nickv[RPCX_NICKVERF]; 957 time_t reqtime, waituntil; 958 caddr_t dpos, cp2; 959 int t1, s, error = 0, mrest_len, auth_len, auth_type; 960 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 961 int verf_len, verf_type; 962 u_int32_t xid; 963 char *auth_str, *verf_str; 964 NFSKERBKEY_T key; /* save session key */ 965 struct ucred acred; 966 #ifndef NFS_V2_ONLY 967 int nqlflag, cachable; 968 u_quad_t frev; 969 #endif 970 struct mbuf *mrest_backup = NULL; 971 struct ucred *origcred = NULL; /* XXX: gcc */ 972 boolean_t retry_cred = TRUE; 973 boolean_t use_opencred = (np->n_flag & NUSEOPENCRED) != 0; 974 975 if (rexmitp != NULL) 976 *rexmitp = 0; 977 978 tryagain_cred: 979 KASSERT(cred != NULL); 980 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 981 rep->r_nmp = nmp; 982 rep->r_procp = procp; 983 rep->r_procnum = procnum; 984 i = 0; 985 m = mrest; 986 while (m) { 987 i += m->m_len; 988 m = m->m_next; 989 } 990 mrest_len = i; 991 992 /* 993 * Get the RPC header with authorization. 994 */ 995 kerbauth: 996 verf_str = auth_str = (char *)0; 997 if (nmp->nm_flag & NFSMNT_KERB) { 998 verf_str = nickv; 999 verf_len = sizeof (nickv); 1000 auth_type = RPCAUTH_KERB4; 1001 memset((caddr_t)key, 0, sizeof (key)); 1002 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 1003 &auth_len, verf_str, verf_len)) { 1004 error = nfs_getauth(nmp, rep, cred, &auth_str, 1005 &auth_len, verf_str, &verf_len, key); 1006 if (error) { 1007 free((caddr_t)rep, M_NFSREQ); 1008 m_freem(mrest); 1009 return (error); 1010 } 1011 } 1012 retry_cred = FALSE; 1013 } else { 1014 /* AUTH_UNIX */ 1015 uid_t uid; 1016 gid_t gid; 1017 1018 /* 1019 * on the most unix filesystems, permission checks are 1020 * done when the file is open(2)'ed. 1021 * ie. once a file is successfully open'ed, 1022 * following i/o operations never fail with EACCES. 1023 * we try to follow the semantics as far as possible. 1024 * 1025 * note that we expect that the nfs server always grant 1026 * accesses by the file's owner. 1027 */ 1028 origcred = cred; 1029 switch (procnum) { 1030 case NFSPROC_READ: 1031 case NFSPROC_WRITE: 1032 case NFSPROC_COMMIT: 1033 uid = np->n_vattr->va_uid; 1034 gid = np->n_vattr->va_gid; 1035 if (cred->cr_uid == uid && cred->cr_gid == gid) { 1036 retry_cred = FALSE; 1037 break; 1038 } 1039 if (use_opencred) 1040 break; 1041 acred.cr_uid = uid; 1042 acred.cr_gid = gid; 1043 acred.cr_ngroups = 0; 1044 acred.cr_ref = 2; /* Just to be safe.. */ 1045 cred = &acred; 1046 break; 1047 default: 1048 retry_cred = FALSE; 1049 break; 1050 } 1051 /* 1052 * backup mbuf chain if we can need it later to retry. 1053 * 1054 * XXX maybe we can keep a direct reference to 1055 * mrest without doing m_copym, but it's ...ugly. 1056 */ 1057 if (retry_cred) 1058 mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); 1059 auth_type = RPCAUTH_UNIX; 1060 auth_len = (((cred->cr_ngroups > nmp->nm_numgrps) ? 1061 nmp->nm_numgrps : cred->cr_ngroups) << 2) + 1062 5 * NFSX_UNSIGNED; 1063 } 1064 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1065 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1066 if (auth_str) 1067 free(auth_str, M_TEMP); 1068 1069 /* 1070 * For stream protocols, insert a Sun RPC Record Mark. 1071 */ 1072 if (nmp->nm_sotype == SOCK_STREAM) { 1073 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1074 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1075 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1076 } 1077 rep->r_mreq = m; 1078 rep->r_xid = xid; 1079 tryagain: 1080 if (nmp->nm_flag & NFSMNT_SOFT) 1081 rep->r_retry = nmp->nm_retry; 1082 else 1083 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1084 rep->r_rtt = rep->r_rexmit = 0; 1085 if (proct[procnum] > 0) 1086 rep->r_flags = R_TIMING; 1087 else 1088 rep->r_flags = 0; 1089 rep->r_mrep = NULL; 1090 1091 /* 1092 * Do the client side RPC. 1093 */ 1094 nfsstats.rpcrequests++; 1095 /* 1096 * Chain request into list of outstanding requests. Be sure 1097 * to put it LAST so timer finds oldest requests first. 1098 */ 1099 s = splsoftnet(); 1100 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1101 1102 /* Get send time for nqnfs */ 1103 reqtime = time.tv_sec; 1104 1105 /* 1106 * If backing off another request or avoiding congestion, don't 1107 * send this one now but let timer do it. If not timing a request, 1108 * do it now. 1109 */ 1110 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1111 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1112 nmp->nm_sent < nmp->nm_cwnd)) { 1113 splx(s); 1114 if (nmp->nm_soflags & PR_CONNREQUIRED) 1115 error = nfs_sndlock(&nmp->nm_iflag, rep); 1116 if (!error) { 1117 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1118 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, procp); 1119 if (nmp->nm_soflags & PR_CONNREQUIRED) 1120 nfs_sndunlock(&nmp->nm_iflag); 1121 } 1122 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1123 nmp->nm_sent += NFS_CWNDSCALE; 1124 rep->r_flags |= R_SENT; 1125 } 1126 } else { 1127 splx(s); 1128 rep->r_rtt = -1; 1129 } 1130 1131 /* 1132 * Wait for the reply from our send or the timer's. 1133 */ 1134 if (!error || error == EPIPE) 1135 error = nfs_reply(rep, procp); 1136 1137 /* 1138 * RPC done, unlink the request. 1139 */ 1140 s = splsoftnet(); 1141 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1142 splx(s); 1143 1144 /* 1145 * Decrement the outstanding request count. 1146 */ 1147 if (rep->r_flags & R_SENT) { 1148 rep->r_flags &= ~R_SENT; /* paranoia */ 1149 nmp->nm_sent -= NFS_CWNDSCALE; 1150 } 1151 1152 if (rexmitp != NULL) { 1153 int rexmit; 1154 1155 if (nmp->nm_sotype != SOCK_DGRAM) 1156 rexmit = (rep->r_flags & R_REXMITTED) != 0; 1157 else 1158 rexmit = rep->r_rexmit; 1159 *rexmitp = rexmit; 1160 } 1161 1162 /* 1163 * If there was a successful reply and a tprintf msg. 1164 * tprintf a response. 1165 */ 1166 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1167 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1168 "is alive again"); 1169 mrep = rep->r_mrep; 1170 md = rep->r_md; 1171 dpos = rep->r_dpos; 1172 if (error) 1173 goto nfsmout; 1174 1175 /* 1176 * break down the rpc header and check if ok 1177 */ 1178 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1179 if (*tl++ == rpc_msgdenied) { 1180 if (*tl == rpc_mismatch) 1181 error = EOPNOTSUPP; 1182 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1183 if (!failed_auth) { 1184 failed_auth++; 1185 mheadend->m_next = (struct mbuf *)0; 1186 m_freem(mrep); 1187 m_freem(rep->r_mreq); 1188 goto kerbauth; 1189 } else 1190 error = EAUTH; 1191 } else 1192 error = EACCES; 1193 m_freem(mrep); 1194 goto nfsmout; 1195 } 1196 1197 /* 1198 * Grab any Kerberos verifier, otherwise just throw it away. 1199 */ 1200 verf_type = fxdr_unsigned(int, *tl++); 1201 i = fxdr_unsigned(int32_t, *tl); 1202 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1203 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1204 if (error) 1205 goto nfsmout; 1206 } else if (i > 0) 1207 nfsm_adv(nfsm_rndup(i)); 1208 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1209 /* 0 == ok */ 1210 if (*tl == 0) { 1211 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1212 if (*tl != 0) { 1213 error = fxdr_unsigned(int, *tl); 1214 switch (error) { 1215 case NFSERR_PERM: 1216 error = EPERM; 1217 break; 1218 1219 case NFSERR_NOENT: 1220 error = ENOENT; 1221 break; 1222 1223 case NFSERR_IO: 1224 error = EIO; 1225 break; 1226 1227 case NFSERR_NXIO: 1228 error = ENXIO; 1229 break; 1230 1231 case NFSERR_ACCES: 1232 error = EACCES; 1233 if (!retry_cred) 1234 break; 1235 m_freem(mrep); 1236 m_freem(rep->r_mreq); 1237 FREE(rep, M_NFSREQ); 1238 use_opencred = !use_opencred; 1239 if (mrest_backup == NULL) 1240 /* m_copym failure */ 1241 return ENOMEM; 1242 mrest = mrest_backup; 1243 mrest_backup = NULL; 1244 cred = origcred; 1245 error = 0; 1246 retry_cred = FALSE; 1247 goto tryagain_cred; 1248 1249 case NFSERR_EXIST: 1250 error = EEXIST; 1251 break; 1252 1253 case NFSERR_XDEV: 1254 error = EXDEV; 1255 break; 1256 1257 case NFSERR_NODEV: 1258 error = ENODEV; 1259 break; 1260 1261 case NFSERR_NOTDIR: 1262 error = ENOTDIR; 1263 break; 1264 1265 case NFSERR_ISDIR: 1266 error = EISDIR; 1267 break; 1268 1269 case NFSERR_INVAL: 1270 error = EINVAL; 1271 break; 1272 1273 case NFSERR_FBIG: 1274 error = EFBIG; 1275 break; 1276 1277 case NFSERR_NOSPC: 1278 error = ENOSPC; 1279 break; 1280 1281 case NFSERR_ROFS: 1282 error = EROFS; 1283 break; 1284 1285 case NFSERR_MLINK: 1286 error = EMLINK; 1287 break; 1288 1289 case NFSERR_TIMEDOUT: 1290 error = ETIMEDOUT; 1291 break; 1292 1293 case NFSERR_NAMETOL: 1294 error = ENAMETOOLONG; 1295 break; 1296 1297 case NFSERR_NOTEMPTY: 1298 error = ENOTEMPTY; 1299 break; 1300 1301 case NFSERR_DQUOT: 1302 error = EDQUOT; 1303 break; 1304 1305 case NFSERR_STALE: 1306 /* 1307 * If the File Handle was stale, invalidate the 1308 * lookup cache, just in case. 1309 */ 1310 error = ESTALE; 1311 cache_purge(NFSTOV(np)); 1312 break; 1313 1314 case NFSERR_REMOTE: 1315 error = EREMOTE; 1316 break; 1317 1318 case NFSERR_WFLUSH: 1319 case NFSERR_BADHANDLE: 1320 case NFSERR_NOT_SYNC: 1321 case NFSERR_BAD_COOKIE: 1322 error = EINVAL; 1323 break; 1324 1325 case NFSERR_NOTSUPP: 1326 error = ENOTSUP; 1327 break; 1328 1329 case NFSERR_TOOSMALL: 1330 case NFSERR_SERVERFAULT: 1331 case NFSERR_BADTYPE: 1332 error = EINVAL; 1333 break; 1334 1335 case NFSERR_TRYLATER: 1336 if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) 1337 break; 1338 m_freem(mrep); 1339 error = 0; 1340 waituntil = time.tv_sec + trylater_delay; 1341 while (time.tv_sec < waituntil) 1342 (void) tsleep((caddr_t)&lbolt, 1343 PSOCK, "nqnfstry", 0); 1344 trylater_delay *= NFS_TRYLATERDELMUL; 1345 if (trylater_delay > NFS_TRYLATERDELMAX) 1346 trylater_delay = NFS_TRYLATERDELMAX; 1347 /* 1348 * RFC1813: 1349 * The client should wait and then try 1350 * the request with a new RPC transaction ID. 1351 */ 1352 nfs_renewxid(rep); 1353 goto tryagain; 1354 1355 case NFSERR_STALEWRITEVERF: 1356 error = EINVAL; 1357 break; 1358 1359 default: 1360 #ifdef DIAGNOSTIC 1361 printf("Invalid rpc error code %d\n", error); 1362 #endif 1363 error = EINVAL; 1364 break; 1365 } 1366 1367 if (nmp->nm_flag & NFSMNT_NFSV3) { 1368 *mrp = mrep; 1369 *mdp = md; 1370 *dposp = dpos; 1371 error |= NFSERR_RETERR; 1372 } else 1373 m_freem(mrep); 1374 goto nfsmout; 1375 } 1376 1377 /* 1378 * note which credential worked to minimize number of retries. 1379 */ 1380 if (use_opencred) 1381 np->n_flag |= NUSEOPENCRED; 1382 else 1383 np->n_flag &= ~NUSEOPENCRED; 1384 1385 #ifndef NFS_V2_ONLY 1386 /* 1387 * For nqnfs, get any lease in reply 1388 */ 1389 if (nmp->nm_flag & NFSMNT_NQNFS) { 1390 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1391 if (*tl) { 1392 nqlflag = fxdr_unsigned(int, *tl); 1393 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1394 cachable = fxdr_unsigned(int, *tl++); 1395 reqtime += fxdr_unsigned(int, *tl++); 1396 if (reqtime > time.tv_sec) { 1397 frev = fxdr_hyper(tl); 1398 nqnfs_clientlease(nmp, np, nqlflag, 1399 cachable, reqtime, frev); 1400 } 1401 } 1402 } 1403 #endif 1404 *mrp = mrep; 1405 *mdp = md; 1406 *dposp = dpos; 1407 1408 KASSERT(error == 0); 1409 goto nfsmout; 1410 } 1411 m_freem(mrep); 1412 error = EPROTONOSUPPORT; 1413 nfsmout: 1414 m_freem(rep->r_mreq); 1415 free((caddr_t)rep, M_NFSREQ); 1416 m_freem(mrest_backup); 1417 return (error); 1418 } 1419 #endif /* NFS */ 1420 1421 /* 1422 * Generate the rpc reply header 1423 * siz arg. is used to decide if adding a cluster is worthwhile 1424 */ 1425 int 1426 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1427 int siz; 1428 struct nfsrv_descript *nd; 1429 struct nfssvc_sock *slp; 1430 int err; 1431 int cache; 1432 u_quad_t *frev; 1433 struct mbuf **mrq; 1434 struct mbuf **mbp; 1435 caddr_t *bposp; 1436 { 1437 u_int32_t *tl; 1438 struct mbuf *mreq; 1439 caddr_t bpos; 1440 struct mbuf *mb; 1441 1442 mreq = m_gethdr(M_WAIT, MT_DATA); 1443 MCLAIM(mreq, &nfs_mowner); 1444 mb = mreq; 1445 /* 1446 * If this is a big reply, use a cluster else 1447 * try and leave leading space for the lower level headers. 1448 */ 1449 siz += RPC_REPLYSIZ; 1450 if (siz >= max_datalen) { 1451 m_clget(mreq, M_WAIT); 1452 } else 1453 mreq->m_data += max_hdr; 1454 tl = mtod(mreq, u_int32_t *); 1455 mreq->m_len = 6 * NFSX_UNSIGNED; 1456 bpos = ((caddr_t)tl) + mreq->m_len; 1457 *tl++ = txdr_unsigned(nd->nd_retxid); 1458 *tl++ = rpc_reply; 1459 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1460 *tl++ = rpc_msgdenied; 1461 if (err & NFSERR_AUTHERR) { 1462 *tl++ = rpc_autherr; 1463 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1464 mreq->m_len -= NFSX_UNSIGNED; 1465 bpos -= NFSX_UNSIGNED; 1466 } else { 1467 *tl++ = rpc_mismatch; 1468 *tl++ = txdr_unsigned(RPC_VER2); 1469 *tl = txdr_unsigned(RPC_VER2); 1470 } 1471 } else { 1472 *tl++ = rpc_msgaccepted; 1473 1474 /* 1475 * For Kerberos authentication, we must send the nickname 1476 * verifier back, otherwise just RPCAUTH_NULL. 1477 */ 1478 if (nd->nd_flag & ND_KERBFULL) { 1479 struct nfsuid *nuidp; 1480 struct timeval ktvin, ktvout; 1481 1482 LIST_FOREACH(nuidp, NUIDHASH(slp, nd->nd_cr.cr_uid), 1483 nu_hash) { 1484 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1485 (!nd->nd_nam2 || netaddr_match( 1486 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1487 nd->nd_nam2))) 1488 break; 1489 } 1490 if (nuidp) { 1491 ktvin.tv_sec = 1492 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1493 - 1); 1494 ktvin.tv_usec = 1495 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1496 1497 /* 1498 * Encrypt the timestamp in ecb mode using the 1499 * session key. 1500 */ 1501 #ifdef NFSKERB 1502 XXX 1503 #endif 1504 1505 *tl++ = rpc_auth_kerb; 1506 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1507 *tl = ktvout.tv_sec; 1508 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1509 *tl++ = ktvout.tv_usec; 1510 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1511 } else { 1512 *tl++ = 0; 1513 *tl++ = 0; 1514 } 1515 } else { 1516 *tl++ = 0; 1517 *tl++ = 0; 1518 } 1519 switch (err) { 1520 case EPROGUNAVAIL: 1521 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1522 break; 1523 case EPROGMISMATCH: 1524 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1525 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1526 if (nd->nd_flag & ND_NQNFS) { 1527 *tl++ = txdr_unsigned(3); 1528 *tl = txdr_unsigned(3); 1529 } else { 1530 *tl++ = txdr_unsigned(2); 1531 *tl = txdr_unsigned(3); 1532 } 1533 break; 1534 case EPROCUNAVAIL: 1535 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1536 break; 1537 case EBADRPC: 1538 *tl = txdr_unsigned(RPC_GARBAGE); 1539 break; 1540 default: 1541 *tl = 0; 1542 if (err != NFSERR_RETVOID) { 1543 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1544 if (err) 1545 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1546 else 1547 *tl = 0; 1548 } 1549 break; 1550 }; 1551 } 1552 1553 /* 1554 * For nqnfs, piggyback lease as requested. 1555 */ 1556 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1557 if (nd->nd_flag & ND_LEASE) { 1558 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1559 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1560 *tl++ = txdr_unsigned(cache); 1561 *tl++ = txdr_unsigned(nd->nd_duration); 1562 txdr_hyper(*frev, tl); 1563 } else { 1564 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1565 *tl = 0; 1566 } 1567 } 1568 if (mrq != NULL) 1569 *mrq = mreq; 1570 *mbp = mb; 1571 *bposp = bpos; 1572 if (err != 0 && err != NFSERR_RETVOID) 1573 nfsstats.srvrpc_errs++; 1574 return (0); 1575 } 1576 1577 /* 1578 * Nfs timer routine 1579 * Scan the nfsreq list and retranmit any requests that have timed out 1580 * To avoid retransmission attempts on STREAM sockets (in the future) make 1581 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1582 */ 1583 void 1584 nfs_timer(arg) 1585 void *arg; /* never used */ 1586 { 1587 struct nfsreq *rep; 1588 struct mbuf *m; 1589 struct socket *so; 1590 struct nfsmount *nmp; 1591 int timeo; 1592 int s, error; 1593 #ifdef NFSSERVER 1594 struct nfssvc_sock *slp; 1595 static long lasttime = 0; 1596 u_quad_t cur_usec; 1597 #endif 1598 1599 s = splsoftnet(); 1600 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1601 nmp = rep->r_nmp; 1602 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1603 continue; 1604 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1605 rep->r_flags |= R_SOFTTERM; 1606 continue; 1607 } 1608 if (rep->r_rtt >= 0) { 1609 rep->r_rtt++; 1610 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1611 timeo = nmp->nm_timeo; 1612 else 1613 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1614 if (nmp->nm_timeouts > 0) 1615 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1616 if (rep->r_rtt <= timeo) 1617 continue; 1618 if (nmp->nm_timeouts < 1619 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1620 nmp->nm_timeouts++; 1621 } 1622 /* 1623 * Check for server not responding 1624 */ 1625 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1626 rep->r_rexmit > nmp->nm_deadthresh) { 1627 nfs_msg(rep->r_procp, 1628 nmp->nm_mountp->mnt_stat.f_mntfromname, 1629 "not responding"); 1630 rep->r_flags |= R_TPRINTFMSG; 1631 } 1632 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1633 nfsstats.rpctimeouts++; 1634 rep->r_flags |= R_SOFTTERM; 1635 continue; 1636 } 1637 if (nmp->nm_sotype != SOCK_DGRAM) { 1638 if (++rep->r_rexmit > NFS_MAXREXMIT) 1639 rep->r_rexmit = NFS_MAXREXMIT; 1640 continue; 1641 } 1642 if ((so = nmp->nm_so) == NULL) 1643 continue; 1644 1645 /* 1646 * If there is enough space and the window allows.. 1647 * Resend it 1648 * Set r_rtt to -1 in case we fail to send it now. 1649 */ 1650 rep->r_rtt = -1; 1651 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1652 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1653 (rep->r_flags & R_SENT) || 1654 nmp->nm_sent < nmp->nm_cwnd) && 1655 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1656 if (so->so_state & SS_ISCONNECTED) 1657 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1658 (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); 1659 else 1660 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1661 nmp->nm_nam, (struct mbuf *)0, (struct proc *)0); 1662 if (error) { 1663 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1664 #ifdef DEBUG 1665 printf("nfs_timer: ignoring error %d\n", 1666 error); 1667 #endif 1668 so->so_error = 0; 1669 } 1670 } else { 1671 /* 1672 * Iff first send, start timing 1673 * else turn timing off, backoff timer 1674 * and divide congestion window by 2. 1675 */ 1676 if (rep->r_flags & R_SENT) { 1677 rep->r_flags &= ~R_TIMING; 1678 if (++rep->r_rexmit > NFS_MAXREXMIT) 1679 rep->r_rexmit = NFS_MAXREXMIT; 1680 nmp->nm_cwnd >>= 1; 1681 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1682 nmp->nm_cwnd = NFS_CWNDSCALE; 1683 nfsstats.rpcretries++; 1684 } else { 1685 rep->r_flags |= R_SENT; 1686 nmp->nm_sent += NFS_CWNDSCALE; 1687 } 1688 rep->r_rtt = 0; 1689 } 1690 } 1691 } 1692 1693 #ifdef NFSSERVER 1694 /* 1695 * Call the nqnfs server timer once a second to handle leases. 1696 */ 1697 if (lasttime != time.tv_sec) { 1698 lasttime = time.tv_sec; 1699 nqnfs_serverd(); 1700 } 1701 1702 /* 1703 * Scan the write gathering queues for writes that need to be 1704 * completed now. 1705 */ 1706 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec; 1707 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1708 if (LIST_FIRST(&slp->ns_tq) && 1709 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) 1710 nfsrv_wakenfsd(slp); 1711 } 1712 #endif /* NFSSERVER */ 1713 splx(s); 1714 callout_schedule(&nfs_timer_ch, nfs_ticks); 1715 } 1716 1717 /*ARGSUSED*/ 1718 void 1719 nfs_exit(p, v) 1720 struct proc *p; 1721 void *v; 1722 { 1723 struct nfsreq *rp; 1724 int s = splsoftnet(); 1725 1726 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 1727 if (rp->r_procp == p) 1728 TAILQ_REMOVE(&nfs_reqq, rp, r_chain); 1729 } 1730 splx(s); 1731 } 1732 1733 /* 1734 * Test for a termination condition pending on the process. 1735 * This is used for NFSMNT_INT mounts. 1736 */ 1737 int 1738 nfs_sigintr(nmp, rep, p) 1739 struct nfsmount *nmp; 1740 struct nfsreq *rep; 1741 struct proc *p; 1742 { 1743 sigset_t ss; 1744 1745 if (rep && (rep->r_flags & R_SOFTTERM)) 1746 return (EINTR); 1747 if (!(nmp->nm_flag & NFSMNT_INT)) 1748 return (0); 1749 if (p) { 1750 sigpending1(p, &ss); 1751 #if 0 1752 sigminusset(&p->p_sigctx.ps_sigignore, &ss); 1753 #endif 1754 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1755 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1756 sigismember(&ss, SIGQUIT)) 1757 return (EINTR); 1758 } 1759 return (0); 1760 } 1761 1762 /* 1763 * Lock a socket against others. 1764 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1765 * and also to avoid race conditions between the processes with nfs requests 1766 * in progress when a reconnect is necessary. 1767 */ 1768 int 1769 nfs_sndlock(flagp, rep) 1770 int *flagp; 1771 struct nfsreq *rep; 1772 { 1773 struct proc *p; 1774 int slpflag = 0, slptimeo = 0; 1775 1776 if (rep) { 1777 p = rep->r_procp; 1778 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1779 slpflag = PCATCH; 1780 } else 1781 p = (struct proc *)0; 1782 while (*flagp & NFSMNT_SNDLOCK) { 1783 if (rep && nfs_sigintr(rep->r_nmp, rep, p)) 1784 return (EINTR); 1785 *flagp |= NFSMNT_WANTSND; 1786 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1787 slptimeo); 1788 if (slpflag == PCATCH) { 1789 slpflag = 0; 1790 slptimeo = 2 * hz; 1791 } 1792 } 1793 *flagp |= NFSMNT_SNDLOCK; 1794 return (0); 1795 } 1796 1797 /* 1798 * Unlock the stream socket for others. 1799 */ 1800 void 1801 nfs_sndunlock(flagp) 1802 int *flagp; 1803 { 1804 1805 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1806 panic("nfs sndunlock"); 1807 *flagp &= ~NFSMNT_SNDLOCK; 1808 if (*flagp & NFSMNT_WANTSND) { 1809 *flagp &= ~NFSMNT_WANTSND; 1810 wakeup((caddr_t)flagp); 1811 } 1812 } 1813 1814 int 1815 nfs_rcvlock(rep) 1816 struct nfsreq *rep; 1817 { 1818 struct nfsmount *nmp = rep->r_nmp; 1819 int *flagp = &nmp->nm_iflag; 1820 int slpflag, slptimeo = 0; 1821 int error = 0; 1822 1823 if (*flagp & NFSMNT_DISMNT) 1824 return EIO; 1825 1826 if (*flagp & NFSMNT_INT) 1827 slpflag = PCATCH; 1828 else 1829 slpflag = 0; 1830 simple_lock(&nmp->nm_slock); 1831 while (*flagp & NFSMNT_RCVLOCK) { 1832 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) { 1833 error = EINTR; 1834 goto quit; 1835 } 1836 *flagp |= NFSMNT_WANTRCV; 1837 nmp->nm_waiters++; 1838 (void) ltsleep(flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1839 slptimeo, &nmp->nm_slock); 1840 nmp->nm_waiters--; 1841 if (*flagp & NFSMNT_DISMNT) { 1842 wakeup(&nmp->nm_waiters); 1843 error = EIO; 1844 goto quit; 1845 } 1846 /* If our reply was received while we were sleeping, 1847 * then just return without taking the lock to avoid a 1848 * situation where a single iod could 'capture' the 1849 * receive lock. 1850 */ 1851 if (rep->r_mrep != NULL) { 1852 error = EALREADY; 1853 goto quit; 1854 } 1855 if (slpflag == PCATCH) { 1856 slpflag = 0; 1857 slptimeo = 2 * hz; 1858 } 1859 } 1860 *flagp |= NFSMNT_RCVLOCK; 1861 quit: 1862 simple_unlock(&nmp->nm_slock); 1863 return error; 1864 } 1865 1866 /* 1867 * Unlock the stream socket for others. 1868 */ 1869 void 1870 nfs_rcvunlock(nmp) 1871 struct nfsmount *nmp; 1872 { 1873 int *flagp = &nmp->nm_iflag; 1874 1875 simple_lock(&nmp->nm_slock); 1876 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1877 panic("nfs rcvunlock"); 1878 *flagp &= ~NFSMNT_RCVLOCK; 1879 if (*flagp & NFSMNT_WANTRCV) { 1880 *flagp &= ~NFSMNT_WANTRCV; 1881 wakeup((caddr_t)flagp); 1882 } 1883 simple_unlock(&nmp->nm_slock); 1884 } 1885 1886 /* 1887 * Parse an RPC request 1888 * - verify it 1889 * - fill in the cred struct. 1890 */ 1891 int 1892 nfs_getreq(nd, nfsd, has_header) 1893 struct nfsrv_descript *nd; 1894 struct nfsd *nfsd; 1895 int has_header; 1896 { 1897 int len, i; 1898 u_int32_t *tl; 1899 int32_t t1; 1900 struct uio uio; 1901 struct iovec iov; 1902 caddr_t dpos, cp2, cp; 1903 u_int32_t nfsvers, auth_type; 1904 uid_t nickuid; 1905 int error = 0, nqnfs = 0, ticklen; 1906 struct mbuf *mrep, *md; 1907 struct nfsuid *nuidp; 1908 struct timeval tvin, tvout; 1909 1910 mrep = nd->nd_mrep; 1911 md = nd->nd_md; 1912 dpos = nd->nd_dpos; 1913 if (has_header) { 1914 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1915 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1916 if (*tl++ != rpc_call) { 1917 m_freem(mrep); 1918 return (EBADRPC); 1919 } 1920 } else 1921 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1922 nd->nd_repstat = 0; 1923 nd->nd_flag = 0; 1924 if (*tl++ != rpc_vers) { 1925 nd->nd_repstat = ERPCMISMATCH; 1926 nd->nd_procnum = NFSPROC_NOOP; 1927 return (0); 1928 } 1929 if (*tl != nfs_prog) { 1930 if (*tl == nqnfs_prog) 1931 nqnfs++; 1932 else { 1933 nd->nd_repstat = EPROGUNAVAIL; 1934 nd->nd_procnum = NFSPROC_NOOP; 1935 return (0); 1936 } 1937 } 1938 tl++; 1939 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1940 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1941 (nfsvers != NQNFS_VER3 && nqnfs)) { 1942 nd->nd_repstat = EPROGMISMATCH; 1943 nd->nd_procnum = NFSPROC_NOOP; 1944 return (0); 1945 } 1946 if (nqnfs) 1947 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1948 else if (nfsvers == NFS_VER3) 1949 nd->nd_flag = ND_NFSV3; 1950 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1951 if (nd->nd_procnum == NFSPROC_NULL) 1952 return (0); 1953 if (nd->nd_procnum >= NFS_NPROCS || 1954 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1955 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1956 nd->nd_repstat = EPROCUNAVAIL; 1957 nd->nd_procnum = NFSPROC_NOOP; 1958 return (0); 1959 } 1960 if ((nd->nd_flag & ND_NFSV3) == 0) 1961 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1962 auth_type = *tl++; 1963 len = fxdr_unsigned(int, *tl++); 1964 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1965 m_freem(mrep); 1966 return (EBADRPC); 1967 } 1968 1969 nd->nd_flag &= ~ND_KERBAUTH; 1970 /* 1971 * Handle auth_unix or auth_kerb. 1972 */ 1973 if (auth_type == rpc_auth_unix) { 1974 len = fxdr_unsigned(int, *++tl); 1975 if (len < 0 || len > NFS_MAXNAMLEN) { 1976 m_freem(mrep); 1977 return (EBADRPC); 1978 } 1979 nfsm_adv(nfsm_rndup(len)); 1980 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1981 memset((caddr_t)&nd->nd_cr, 0, sizeof (struct ucred)); 1982 nd->nd_cr.cr_ref = 1; 1983 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1984 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1985 len = fxdr_unsigned(int, *tl); 1986 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1987 m_freem(mrep); 1988 return (EBADRPC); 1989 } 1990 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1991 for (i = 0; i < len; i++) 1992 if (i < NGROUPS) 1993 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1994 else 1995 tl++; 1996 nd->nd_cr.cr_ngroups = (len > NGROUPS) ? NGROUPS : len; 1997 if (nd->nd_cr.cr_ngroups > 1) 1998 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1999 len = fxdr_unsigned(int, *++tl); 2000 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2001 m_freem(mrep); 2002 return (EBADRPC); 2003 } 2004 if (len > 0) 2005 nfsm_adv(nfsm_rndup(len)); 2006 } else if (auth_type == rpc_auth_kerb) { 2007 switch (fxdr_unsigned(int, *tl++)) { 2008 case RPCAKN_FULLNAME: 2009 ticklen = fxdr_unsigned(int, *tl); 2010 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2011 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2012 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2013 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2014 m_freem(mrep); 2015 return (EBADRPC); 2016 } 2017 uio.uio_offset = 0; 2018 uio.uio_iov = &iov; 2019 uio.uio_iovcnt = 1; 2020 uio.uio_segflg = UIO_SYSSPACE; 2021 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 2022 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2023 nfsm_mtouio(&uio, uio.uio_resid); 2024 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2025 if (*tl++ != rpc_auth_kerb || 2026 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2027 printf("Bad kerb verifier\n"); 2028 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2029 nd->nd_procnum = NFSPROC_NOOP; 2030 return (0); 2031 } 2032 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 2033 tl = (u_int32_t *)cp; 2034 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2035 printf("Not fullname kerb verifier\n"); 2036 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2037 nd->nd_procnum = NFSPROC_NOOP; 2038 return (0); 2039 } 2040 cp += NFSX_UNSIGNED; 2041 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 2042 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2043 nd->nd_flag |= ND_KERBFULL; 2044 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2045 break; 2046 case RPCAKN_NICKNAME: 2047 if (len != 2 * NFSX_UNSIGNED) { 2048 printf("Kerb nickname short\n"); 2049 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2050 nd->nd_procnum = NFSPROC_NOOP; 2051 return (0); 2052 } 2053 nickuid = fxdr_unsigned(uid_t, *tl); 2054 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2055 if (*tl++ != rpc_auth_kerb || 2056 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2057 printf("Kerb nick verifier bad\n"); 2058 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2059 nd->nd_procnum = NFSPROC_NOOP; 2060 return (0); 2061 } 2062 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2063 tvin.tv_sec = *tl++; 2064 tvin.tv_usec = *tl; 2065 2066 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 2067 nu_hash) { 2068 if (nuidp->nu_cr.cr_uid == nickuid && 2069 (!nd->nd_nam2 || 2070 netaddr_match(NU_NETFAM(nuidp), 2071 &nuidp->nu_haddr, nd->nd_nam2))) 2072 break; 2073 } 2074 if (!nuidp) { 2075 nd->nd_repstat = 2076 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2077 nd->nd_procnum = NFSPROC_NOOP; 2078 return (0); 2079 } 2080 2081 /* 2082 * Now, decrypt the timestamp using the session key 2083 * and validate it. 2084 */ 2085 #ifdef NFSKERB 2086 XXX 2087 #endif 2088 2089 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2090 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2091 if (nuidp->nu_expire < time.tv_sec || 2092 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2093 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2094 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2095 nuidp->nu_expire = 0; 2096 nd->nd_repstat = 2097 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2098 nd->nd_procnum = NFSPROC_NOOP; 2099 return (0); 2100 } 2101 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 2102 nd->nd_flag |= ND_KERBNICK; 2103 }; 2104 } else { 2105 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2106 nd->nd_procnum = NFSPROC_NOOP; 2107 return (0); 2108 } 2109 2110 /* 2111 * For nqnfs, get piggybacked lease request. 2112 */ 2113 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 2114 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2115 nd->nd_flag |= fxdr_unsigned(int, *tl); 2116 if (nd->nd_flag & ND_LEASE) { 2117 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2118 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 2119 } else 2120 nd->nd_duration = NQ_MINLEASE; 2121 } else 2122 nd->nd_duration = NQ_MINLEASE; 2123 nd->nd_md = md; 2124 nd->nd_dpos = dpos; 2125 return (0); 2126 nfsmout: 2127 return (error); 2128 } 2129 2130 int 2131 nfs_msg(p, server, msg) 2132 struct proc *p; 2133 char *server, *msg; 2134 { 2135 tpr_t tpr; 2136 2137 if (p) 2138 tpr = tprintf_open(p); 2139 else 2140 tpr = NULL; 2141 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2142 tprintf_close(tpr); 2143 return (0); 2144 } 2145 2146 #ifdef NFSSERVER 2147 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 2148 struct nfssvc_sock *, struct proc *, 2149 struct mbuf **)) = { 2150 nfsrv_null, 2151 nfsrv_getattr, 2152 nfsrv_setattr, 2153 nfsrv_lookup, 2154 nfsrv3_access, 2155 nfsrv_readlink, 2156 nfsrv_read, 2157 nfsrv_write, 2158 nfsrv_create, 2159 nfsrv_mkdir, 2160 nfsrv_symlink, 2161 nfsrv_mknod, 2162 nfsrv_remove, 2163 nfsrv_rmdir, 2164 nfsrv_rename, 2165 nfsrv_link, 2166 nfsrv_readdir, 2167 nfsrv_readdirplus, 2168 nfsrv_statfs, 2169 nfsrv_fsinfo, 2170 nfsrv_pathconf, 2171 nfsrv_commit, 2172 nqnfsrv_getlease, 2173 nqnfsrv_vacated, 2174 nfsrv_noop, 2175 nfsrv_noop 2176 }; 2177 2178 /* 2179 * Socket upcall routine for the nfsd sockets. 2180 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2181 * Essentially do as much as possible non-blocking, else punt and it will 2182 * be called with M_WAIT from an nfsd. 2183 */ 2184 void 2185 nfsrv_rcv(so, arg, waitflag) 2186 struct socket *so; 2187 caddr_t arg; 2188 int waitflag; 2189 { 2190 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2191 struct mbuf *m; 2192 struct mbuf *mp, *nam; 2193 struct uio auio; 2194 int flags, error; 2195 2196 if ((slp->ns_flag & SLP_VALID) == 0) 2197 return; 2198 #if 1 2199 /* 2200 * Define this to test for nfsds handling this under heavy load. 2201 */ 2202 if (waitflag == M_DONTWAIT) { 2203 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 2204 } 2205 #endif 2206 /* XXX: was NULL, soreceive() requires non-NULL uio->uio_procp */ 2207 auio.uio_procp = curproc; /* XXX curproc */ 2208 if (so->so_type == SOCK_STREAM) { 2209 /* 2210 * If there are already records on the queue, defer soreceive() 2211 * to an nfsd so that there is feedback to the TCP layer that 2212 * the nfs servers are heavily loaded. 2213 */ 2214 if (slp->ns_rec && waitflag == M_DONTWAIT) { 2215 slp->ns_flag |= SLP_NEEDQ; 2216 goto dorecs; 2217 } 2218 2219 /* 2220 * Do soreceive(). 2221 */ 2222 auio.uio_resid = 1000000000; 2223 flags = MSG_DONTWAIT; 2224 error = (*so->so_receive)(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 2225 if (error || mp == (struct mbuf *)0) { 2226 if (error == EWOULDBLOCK) 2227 slp->ns_flag |= SLP_NEEDQ; 2228 else 2229 slp->ns_flag |= SLP_DISCONN; 2230 goto dorecs; 2231 } 2232 m = mp; 2233 if (slp->ns_rawend) { 2234 slp->ns_rawend->m_next = m; 2235 slp->ns_cc += 1000000000 - auio.uio_resid; 2236 } else { 2237 slp->ns_raw = m; 2238 slp->ns_cc = 1000000000 - auio.uio_resid; 2239 } 2240 while (m->m_next) 2241 m = m->m_next; 2242 slp->ns_rawend = m; 2243 2244 /* 2245 * Now try and parse record(s) out of the raw stream data. 2246 */ 2247 error = nfsrv_getstream(slp, waitflag); 2248 if (error) { 2249 if (error == EPERM) 2250 slp->ns_flag |= SLP_DISCONN; 2251 else 2252 slp->ns_flag |= SLP_NEEDQ; 2253 } 2254 } else { 2255 do { 2256 auio.uio_resid = 1000000000; 2257 flags = MSG_DONTWAIT; 2258 error = (*so->so_receive)(so, &nam, &auio, &mp, 2259 (struct mbuf **)0, &flags); 2260 if (mp) { 2261 if (nam) { 2262 m = nam; 2263 m->m_next = mp; 2264 } else 2265 m = mp; 2266 if (slp->ns_recend) 2267 slp->ns_recend->m_nextpkt = m; 2268 else 2269 slp->ns_rec = m; 2270 slp->ns_recend = m; 2271 m->m_nextpkt = (struct mbuf *)0; 2272 } 2273 if (error) { 2274 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2275 && error != EWOULDBLOCK) { 2276 slp->ns_flag |= SLP_DISCONN; 2277 goto dorecs; 2278 } 2279 } 2280 } while (mp); 2281 } 2282 2283 /* 2284 * Now try and process the request records, non-blocking. 2285 */ 2286 dorecs: 2287 if (waitflag == M_DONTWAIT && 2288 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2289 nfsrv_wakenfsd(slp); 2290 } 2291 2292 /* 2293 * Try and extract an RPC request from the mbuf data list received on a 2294 * stream socket. The "waitflag" argument indicates whether or not it 2295 * can sleep. 2296 */ 2297 int 2298 nfsrv_getstream(slp, waitflag) 2299 struct nfssvc_sock *slp; 2300 int waitflag; 2301 { 2302 struct mbuf *m, **mpp; 2303 struct mbuf *recm; 2304 u_int32_t recmark; 2305 2306 if (slp->ns_flag & SLP_GETSTREAM) 2307 panic("nfs getstream"); 2308 slp->ns_flag |= SLP_GETSTREAM; 2309 for (;;) { 2310 if (slp->ns_reclen == 0) { 2311 if (slp->ns_cc < NFSX_UNSIGNED) { 2312 slp->ns_flag &= ~SLP_GETSTREAM; 2313 return (0); 2314 } 2315 m = slp->ns_raw; 2316 m_copydata(m, 0, NFSX_UNSIGNED, (caddr_t)&recmark); 2317 m_adj(m, NFSX_UNSIGNED); 2318 slp->ns_cc -= NFSX_UNSIGNED; 2319 recmark = ntohl(recmark); 2320 slp->ns_reclen = recmark & ~0x80000000; 2321 if (recmark & 0x80000000) 2322 slp->ns_flag |= SLP_LASTFRAG; 2323 else 2324 slp->ns_flag &= ~SLP_LASTFRAG; 2325 if (slp->ns_reclen > NFS_MAXPACKET) { 2326 slp->ns_flag &= ~SLP_GETSTREAM; 2327 return (EPERM); 2328 } 2329 } 2330 2331 /* 2332 * Now get the record part. 2333 * 2334 * Note that slp->ns_reclen may be 0. Linux sometimes 2335 * generates 0-length records. 2336 */ 2337 if (slp->ns_cc == slp->ns_reclen) { 2338 recm = slp->ns_raw; 2339 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2340 slp->ns_cc = slp->ns_reclen = 0; 2341 } else if (slp->ns_cc > slp->ns_reclen) { 2342 recm = slp->ns_raw; 2343 m = m_split(recm, slp->ns_reclen, waitflag); 2344 if (m == NULL) { 2345 slp->ns_flag &= ~SLP_GETSTREAM; 2346 return (EWOULDBLOCK); 2347 } 2348 m_claimm(recm, &nfs_mowner); 2349 slp->ns_raw = m; 2350 if (m->m_next == NULL) 2351 slp->ns_rawend = m; 2352 slp->ns_cc -= slp->ns_reclen; 2353 slp->ns_reclen = 0; 2354 } else { 2355 slp->ns_flag &= ~SLP_GETSTREAM; 2356 return (0); 2357 } 2358 2359 /* 2360 * Accumulate the fragments into a record. 2361 */ 2362 mpp = &slp->ns_frag; 2363 while (*mpp) 2364 mpp = &((*mpp)->m_next); 2365 *mpp = recm; 2366 if (slp->ns_flag & SLP_LASTFRAG) { 2367 if (slp->ns_recend) 2368 slp->ns_recend->m_nextpkt = slp->ns_frag; 2369 else 2370 slp->ns_rec = slp->ns_frag; 2371 slp->ns_recend = slp->ns_frag; 2372 slp->ns_frag = (struct mbuf *)0; 2373 } 2374 } 2375 } 2376 2377 /* 2378 * Parse an RPC header. 2379 */ 2380 int 2381 nfsrv_dorec(slp, nfsd, ndp) 2382 struct nfssvc_sock *slp; 2383 struct nfsd *nfsd; 2384 struct nfsrv_descript **ndp; 2385 { 2386 struct mbuf *m, *nam; 2387 struct nfsrv_descript *nd; 2388 int error; 2389 2390 *ndp = NULL; 2391 if ((slp->ns_flag & SLP_VALID) == 0 || 2392 (m = slp->ns_rec) == (struct mbuf *)0) 2393 return (ENOBUFS); 2394 slp->ns_rec = m->m_nextpkt; 2395 if (slp->ns_rec) 2396 m->m_nextpkt = (struct mbuf *)0; 2397 else 2398 slp->ns_recend = (struct mbuf *)0; 2399 if (m->m_type == MT_SONAME) { 2400 nam = m; 2401 m = m->m_next; 2402 nam->m_next = NULL; 2403 } else 2404 nam = NULL; 2405 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2406 nd->nd_md = nd->nd_mrep = m; 2407 nd->nd_nam2 = nam; 2408 nd->nd_dpos = mtod(m, caddr_t); 2409 error = nfs_getreq(nd, nfsd, TRUE); 2410 if (error) { 2411 m_freem(nam); 2412 pool_put(&nfs_srvdesc_pool, nd); 2413 return (error); 2414 } 2415 *ndp = nd; 2416 nfsd->nfsd_nd = nd; 2417 return (0); 2418 } 2419 2420 2421 /* 2422 * Search for a sleeping nfsd and wake it up. 2423 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2424 * running nfsds will go look for the work in the nfssvc_sock list. 2425 */ 2426 void 2427 nfsrv_wakenfsd(slp) 2428 struct nfssvc_sock *slp; 2429 { 2430 struct nfsd *nd; 2431 2432 if ((slp->ns_flag & SLP_VALID) == 0) 2433 return; 2434 simple_lock(&nfsd_slock); 2435 if (slp->ns_flag & SLP_DOREC) { 2436 simple_unlock(&nfsd_slock); 2437 return; 2438 } 2439 nd = SLIST_FIRST(&nfsd_idle_head); 2440 if (nd) { 2441 SLIST_REMOVE_HEAD(&nfsd_idle_head, nfsd_idle); 2442 simple_unlock(&nfsd_slock); 2443 2444 KASSERT(nd->nfsd_flag & NFSD_WAITING); 2445 nd->nfsd_flag &= ~NFSD_WAITING; 2446 if (nd->nfsd_slp) 2447 panic("nfsd wakeup"); 2448 slp->ns_sref++; 2449 nd->nfsd_slp = slp; 2450 wakeup(nd); 2451 return; 2452 } 2453 slp->ns_flag |= SLP_DOREC; 2454 nfsd_head_flag |= NFSD_CHECKSLP; 2455 TAILQ_INSERT_TAIL(&nfssvc_sockpending, slp, ns_pending); 2456 simple_unlock(&nfsd_slock); 2457 } 2458 #endif /* NFSSERVER */
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