1 /* $NetBSD: nfs_socket.c,v 1.119 2005/12/11 12:25:16 christos 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 1.119 2005/12/11 12:25:16 christos 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 [NFSPROC_NULL] = 0, 127 [NFSPROC_GETATTR] = 1, 128 [NFSPROC_SETATTR] = 0, 129 [NFSPROC_LOOKUP] = 2, 130 [NFSPROC_ACCESS] = 1, 131 [NFSPROC_READLINK] = 3, 132 [NFSPROC_READ] = 3, 133 [NFSPROC_WRITE] = 4, 134 [NFSPROC_CREATE] = 0, 135 [NFSPROC_MKDIR] = 0, 136 [NFSPROC_SYMLINK] = 0, 137 [NFSPROC_MKNOD] = 0, 138 [NFSPROC_REMOVE] = 0, 139 [NFSPROC_RMDIR] = 0, 140 [NFSPROC_RENAME] = 0, 141 [NFSPROC_LINK] = 0, 142 [NFSPROC_READDIR] = 3, 143 [NFSPROC_READDIRPLUS] = 3, 144 [NFSPROC_FSSTAT] = 0, 145 [NFSPROC_FSINFO] = 0, 146 [NFSPROC_PATHCONF] = 0, 147 [NFSPROC_COMMIT] = 0, 148 [NQNFSPROC_GETLEASE] = 0, 149 [NQNFSPROC_VACATED] = 0, 150 [NQNFSPROC_EVICTED] = 0, 151 [NFSPROC_NOOP] = 0, 152 }; 153 154 /* 155 * There is a congestion window for outstanding rpcs maintained per mount 156 * point. The cwnd size is adjusted in roughly the way that: 157 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 158 * SIGCOMM '88". ACM, August 1988. 159 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 160 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 161 * of rpcs is in progress. 162 * (The sent count and cwnd are scaled for integer arith.) 163 * Variants of "slow start" were tried and were found to be too much of a 164 * performance hit (ave. rtt 3 times larger), 165 * I suspect due to the large rtt that nfs rpcs have. 166 */ 167 #define NFS_CWNDSCALE 256 168 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 169 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 170 int nfsrtton = 0; 171 struct nfsrtt nfsrtt; 172 struct nfsreqhead nfs_reqq; 173 174 struct callout nfs_timer_ch = CALLOUT_INITIALIZER_SETFUNC(nfs_timer, NULL); 175 176 /* 177 * Initialize sockets and congestion for a new NFS connection. 178 * We do not free the sockaddr if error. 179 */ 180 int 181 nfs_connect(nmp, rep, l) 182 struct nfsmount *nmp; 183 struct nfsreq *rep; 184 struct lwp *l; 185 { 186 struct socket *so; 187 int s, error, rcvreserve, sndreserve; 188 struct sockaddr *saddr; 189 struct sockaddr_in *sin; 190 #ifdef INET6 191 struct sockaddr_in6 *sin6; 192 #endif 193 struct mbuf *m; 194 195 nmp->nm_so = (struct socket *)0; 196 saddr = mtod(nmp->nm_nam, struct sockaddr *); 197 error = socreate(saddr->sa_family, &nmp->nm_so, 198 nmp->nm_sotype, nmp->nm_soproto, l); 199 if (error) 200 goto bad; 201 so = nmp->nm_so; 202 #ifdef MBUFTRACE 203 so->so_mowner = &nfs_mowner; 204 so->so_rcv.sb_mowner = &nfs_mowner; 205 so->so_snd.sb_mowner = &nfs_mowner; 206 #endif 207 nmp->nm_soflags = so->so_proto->pr_flags; 208 209 /* 210 * Some servers require that the client port be a reserved port number. 211 */ 212 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 213 m = m_get(M_WAIT, MT_SOOPTS); 214 MCLAIM(m, so->so_mowner); 215 *mtod(m, int32_t *) = IP_PORTRANGE_LOW; 216 m->m_len = sizeof(int32_t); 217 if ((error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, m))) 218 goto bad; 219 m = m_get(M_WAIT, MT_SONAME); 220 MCLAIM(m, so->so_mowner); 221 sin = mtod(m, struct sockaddr_in *); 222 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 223 sin->sin_family = AF_INET; 224 sin->sin_addr.s_addr = INADDR_ANY; 225 sin->sin_port = 0; 226 error = sobind(so, m, &lwp0); 227 m_freem(m); 228 if (error) 229 goto bad; 230 } 231 #ifdef INET6 232 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 233 m = m_get(M_WAIT, MT_SOOPTS); 234 MCLAIM(m, so->so_mowner); 235 *mtod(m, int32_t *) = IPV6_PORTRANGE_LOW; 236 m->m_len = sizeof(int32_t); 237 if ((error = sosetopt(so, IPPROTO_IPV6, IPV6_PORTRANGE, m))) 238 goto bad; 239 m = m_get(M_WAIT, MT_SONAME); 240 MCLAIM(m, so->so_mowner); 241 sin6 = mtod(m, struct sockaddr_in6 *); 242 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 243 sin6->sin6_family = AF_INET6; 244 sin6->sin6_addr = in6addr_any; 245 sin6->sin6_port = 0; 246 error = sobind(so, m, &lwp0); 247 m_freem(m); 248 if (error) 249 goto bad; 250 } 251 #endif 252 253 /* 254 * Protocols that do not require connections may be optionally left 255 * unconnected for servers that reply from a port other than NFS_PORT. 256 */ 257 if (nmp->nm_flag & NFSMNT_NOCONN) { 258 if (nmp->nm_soflags & PR_CONNREQUIRED) { 259 error = ENOTCONN; 260 goto bad; 261 } 262 } else { 263 error = soconnect(so, nmp->nm_nam, l); 264 if (error) 265 goto bad; 266 267 /* 268 * Wait for the connection to complete. Cribbed from the 269 * connect system call but with the wait timing out so 270 * that interruptible mounts don't hang here for a long time. 271 */ 272 s = splsoftnet(); 273 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 274 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 275 "nfscn1", 2 * hz); 276 if ((so->so_state & SS_ISCONNECTING) && 277 so->so_error == 0 && rep && 278 (error = nfs_sigintr(nmp, rep, rep->r_lwp)) != 0){ 279 so->so_state &= ~SS_ISCONNECTING; 280 splx(s); 281 goto bad; 282 } 283 } 284 if (so->so_error) { 285 error = so->so_error; 286 so->so_error = 0; 287 splx(s); 288 goto bad; 289 } 290 splx(s); 291 } 292 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 293 so->so_rcv.sb_timeo = (5 * hz); 294 so->so_snd.sb_timeo = (5 * hz); 295 } else { 296 /* 297 * enable receive timeout to detect server crash and reconnect. 298 * otherwise, we can be stuck in soreceive forever. 299 */ 300 so->so_rcv.sb_timeo = (5 * hz); 301 so->so_snd.sb_timeo = 0; 302 } 303 if (nmp->nm_sotype == SOCK_DGRAM) { 304 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 305 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 306 NFS_MAXPKTHDR) * 2; 307 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 308 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 309 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 310 NFS_MAXPKTHDR) * 2; 311 } else { 312 if (nmp->nm_sotype != SOCK_STREAM) 313 panic("nfscon sotype"); 314 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 315 m = m_get(M_WAIT, MT_SOOPTS); 316 MCLAIM(m, so->so_mowner); 317 *mtod(m, int32_t *) = 1; 318 m->m_len = sizeof(int32_t); 319 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 320 } 321 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 322 m = m_get(M_WAIT, MT_SOOPTS); 323 MCLAIM(m, so->so_mowner); 324 *mtod(m, int32_t *) = 1; 325 m->m_len = sizeof(int32_t); 326 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 327 } 328 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 329 sizeof (u_int32_t)) * 2; 330 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 331 sizeof (u_int32_t)) * 2; 332 } 333 error = soreserve(so, sndreserve, rcvreserve); 334 if (error) 335 goto bad; 336 so->so_rcv.sb_flags |= SB_NOINTR; 337 so->so_snd.sb_flags |= SB_NOINTR; 338 339 /* Initialize other non-zero congestion variables */ 340 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 341 NFS_TIMEO << 3; 342 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 343 nmp->nm_sdrtt[3] = 0; 344 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 345 nmp->nm_sent = 0; 346 nmp->nm_timeouts = 0; 347 return (0); 348 349 bad: 350 nfs_disconnect(nmp); 351 return (error); 352 } 353 354 /* 355 * Reconnect routine: 356 * Called when a connection is broken on a reliable protocol. 357 * - clean up the old socket 358 * - nfs_connect() again 359 * - set R_MUSTRESEND for all outstanding requests on mount point 360 * If this fails the mount point is DEAD! 361 * nb: Must be called with the nfs_sndlock() set on the mount point. 362 */ 363 int 364 nfs_reconnect(rep, l) 365 struct nfsreq *rep; 366 struct lwp *l; 367 { 368 struct nfsreq *rp; 369 struct nfsmount *nmp = rep->r_nmp; 370 int error; 371 372 nfs_disconnect(nmp); 373 while ((error = nfs_connect(nmp, rep, l)) != 0) { 374 if (error == EINTR || error == ERESTART) 375 return (EINTR); 376 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscn2", 0); 377 } 378 379 /* 380 * Loop through outstanding request list and fix up all requests 381 * on old socket. 382 */ 383 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 384 if (rp->r_nmp == nmp) { 385 if ((rp->r_flags & R_MUSTRESEND) == 0) 386 rp->r_flags |= R_MUSTRESEND | R_REXMITTED; 387 rp->r_rexmit = 0; 388 } 389 } 390 return (0); 391 } 392 393 /* 394 * NFS disconnect. Clean up and unlink. 395 */ 396 void 397 nfs_disconnect(nmp) 398 struct nfsmount *nmp; 399 { 400 struct socket *so; 401 int drain = 0; 402 403 if (nmp->nm_so) { 404 so = nmp->nm_so; 405 nmp->nm_so = (struct socket *)0; 406 soshutdown(so, 2); 407 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 408 if (drain) { 409 /* 410 * soshutdown() above should wake up the current 411 * listener. 412 * Now wake up those waiting for the receive lock, and 413 * wait for them to go away unhappy, to prevent *nmp 414 * from evaporating while they're sleeping. 415 */ 416 while (nmp->nm_waiters > 0) { 417 wakeup (&nmp->nm_iflag); 418 (void) tsleep(&nmp->nm_waiters, PVFS, 419 "nfsdis", 0); 420 } 421 } 422 soclose(so); 423 } 424 #ifdef DIAGNOSTIC 425 if (drain && (nmp->nm_waiters > 0)) 426 panic("nfs_disconnect: waiters left after drain?"); 427 #endif 428 } 429 430 void 431 nfs_safedisconnect(nmp) 432 struct nfsmount *nmp; 433 { 434 struct nfsreq dummyreq; 435 436 memset(&dummyreq, 0, sizeof(dummyreq)); 437 dummyreq.r_nmp = nmp; 438 nfs_rcvlock(&dummyreq); /* XXX ignored error return */ 439 nfs_disconnect(nmp); 440 nfs_rcvunlock(nmp); 441 } 442 443 /* 444 * This is the nfs send routine. For connection based socket types, it 445 * must be called with an nfs_sndlock() on the socket. 446 * "rep == NULL" indicates that it has been called from a server. 447 * For the client side: 448 * - return EINTR if the RPC is terminated, 0 otherwise 449 * - set R_MUSTRESEND if the send fails for any reason 450 * - do any cleanup required by recoverable socket errors (? ? ?) 451 * For the server side: 452 * - return EINTR or ERESTART if interrupted by a signal 453 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 454 * - do any cleanup required by recoverable socket errors (? ? ?) 455 */ 456 int 457 nfs_send(so, nam, top, rep, l) 458 struct socket *so; 459 struct mbuf *nam; 460 struct mbuf *top; 461 struct nfsreq *rep; 462 struct lwp *l; 463 { 464 struct mbuf *sendnam; 465 int error, soflags, flags; 466 467 /* XXX nfs_doio()/nfs_request() calls with rep->r_lwp == NULL */ 468 if (l == NULL && rep->r_lwp == NULL) 469 l = curlwp; 470 471 if (rep) { 472 if (rep->r_flags & R_SOFTTERM) { 473 m_freem(top); 474 return (EINTR); 475 } 476 if ((so = rep->r_nmp->nm_so) == NULL) { 477 rep->r_flags |= R_MUSTRESEND; 478 m_freem(top); 479 return (0); 480 } 481 rep->r_flags &= ~R_MUSTRESEND; 482 soflags = rep->r_nmp->nm_soflags; 483 } else 484 soflags = so->so_proto->pr_flags; 485 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 486 sendnam = (struct mbuf *)0; 487 else 488 sendnam = nam; 489 if (so->so_type == SOCK_SEQPACKET) 490 flags = MSG_EOR; 491 else 492 flags = 0; 493 494 error = (*so->so_send)(so, sendnam, (struct uio *)0, top, 495 (struct mbuf *)0, flags, l); 496 if (error) { 497 if (rep) { 498 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 499 /* 500 * We're too fast for the network/driver, 501 * and UDP isn't flowcontrolled. 502 * We need to resend. This is not fatal, 503 * just try again. 504 * 505 * Could be smarter here by doing some sort 506 * of a backoff, but this is rare. 507 */ 508 rep->r_flags |= R_MUSTRESEND; 509 } else { 510 if (error != EPIPE) 511 log(LOG_INFO, 512 "nfs send error %d for %s\n", 513 error, 514 rep->r_nmp->nm_mountp-> 515 mnt_stat.f_mntfromname); 516 /* 517 * Deal with errors for the client side. 518 */ 519 if (rep->r_flags & R_SOFTTERM) 520 error = EINTR; 521 else 522 rep->r_flags |= R_MUSTRESEND; 523 } 524 } else { 525 /* 526 * See above. This error can happen under normal 527 * circumstances and the log is too noisy. 528 * The error will still show up in nfsstat. 529 */ 530 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 531 log(LOG_INFO, "nfsd send error %d\n", error); 532 } 533 534 /* 535 * Handle any recoverable (soft) socket errors here. (? ? ?) 536 */ 537 if (error != EINTR && error != ERESTART && 538 error != EWOULDBLOCK && error != EPIPE) 539 error = 0; 540 } 541 return (error); 542 } 543 544 #ifdef NFS 545 /* 546 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 547 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 548 * Mark and consolidate the data into a new mbuf list. 549 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 550 * small mbufs. 551 * For SOCK_STREAM we must be very careful to read an entire record once 552 * we have read any of it, even if the system call has been interrupted. 553 */ 554 int 555 nfs_receive(rep, aname, mp, l) 556 struct nfsreq *rep; 557 struct mbuf **aname; 558 struct mbuf **mp; 559 struct lwp *l; 560 { 561 struct proc *p; 562 struct socket *so; 563 struct uio auio; 564 struct iovec aio; 565 struct mbuf *m; 566 struct mbuf *control; 567 u_int32_t len; 568 struct mbuf **getnam; 569 int error, sotype, rcvflg; 570 571 p = l->l_proc; 572 /* 573 * Set up arguments for soreceive() 574 */ 575 *mp = (struct mbuf *)0; 576 *aname = (struct mbuf *)0; 577 sotype = rep->r_nmp->nm_sotype; 578 579 /* 580 * For reliable protocols, lock against other senders/receivers 581 * in case a reconnect is necessary. 582 * For SOCK_STREAM, first get the Record Mark to find out how much 583 * more there is to get. 584 * We must lock the socket against other receivers 585 * until we have an entire rpc request/reply. 586 */ 587 if (sotype != SOCK_DGRAM) { 588 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 589 if (error) 590 return (error); 591 tryagain: 592 /* 593 * Check for fatal errors and resending request. 594 */ 595 /* 596 * Ugh: If a reconnect attempt just happened, nm_so 597 * would have changed. NULL indicates a failed 598 * attempt that has essentially shut down this 599 * mount point. 600 */ 601 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 602 nfs_sndunlock(&rep->r_nmp->nm_iflag); 603 return (EINTR); 604 } 605 so = rep->r_nmp->nm_so; 606 if (!so) { 607 error = nfs_reconnect(rep, l); 608 if (error) { 609 nfs_sndunlock(&rep->r_nmp->nm_iflag); 610 return (error); 611 } 612 goto tryagain; 613 } 614 while (rep->r_flags & R_MUSTRESEND) { 615 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 616 nfsstats.rpcretries++; 617 rep->r_rtt = 0; 618 rep->r_flags &= ~R_TIMING; 619 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, l); 620 if (error) { 621 if (error == EINTR || error == ERESTART || 622 (error = nfs_reconnect(rep, l)) != 0) { 623 nfs_sndunlock(&rep->r_nmp->nm_iflag); 624 return (error); 625 } 626 goto tryagain; 627 } 628 } 629 nfs_sndunlock(&rep->r_nmp->nm_iflag); 630 if (sotype == SOCK_STREAM) { 631 aio.iov_base = (caddr_t) &len; 632 aio.iov_len = sizeof(u_int32_t); 633 auio.uio_iov = &aio; 634 auio.uio_iovcnt = 1; 635 auio.uio_segflg = UIO_SYSSPACE; 636 auio.uio_rw = UIO_READ; 637 auio.uio_offset = 0; 638 auio.uio_resid = sizeof(u_int32_t); 639 auio.uio_lwp = NULL; 640 do { 641 rcvflg = MSG_WAITALL; 642 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 643 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 644 if (error == EWOULDBLOCK && rep) { 645 if (rep->r_flags & R_SOFTTERM) 646 return (EINTR); 647 /* 648 * if it seems that the server died after it 649 * received our request, set EPIPE so that 650 * we'll reconnect and retransmit requests. 651 */ 652 if (rep->r_rexmit >= rep->r_nmp->nm_retry) { 653 nfsstats.rpctimeouts++; 654 error = EPIPE; 655 } 656 } 657 } while (error == EWOULDBLOCK); 658 if (!error && auio.uio_resid > 0) { 659 /* 660 * Don't log a 0 byte receive; it means 661 * that the socket has been closed, and 662 * can happen during normal operation 663 * (forcible unmount or Solaris server). 664 */ 665 if (auio.uio_resid != sizeof (u_int32_t)) 666 log(LOG_INFO, 667 "short receive (%lu/%lu) from nfs server %s\n", 668 (u_long)sizeof(u_int32_t) - auio.uio_resid, 669 (u_long)sizeof(u_int32_t), 670 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 671 error = EPIPE; 672 } 673 if (error) 674 goto errout; 675 len = ntohl(len) & ~0x80000000; 676 /* 677 * This is SERIOUS! We are out of sync with the sender 678 * and forcing a disconnect/reconnect is all I can do. 679 */ 680 if (len > NFS_MAXPACKET) { 681 log(LOG_ERR, "%s (%d) from nfs server %s\n", 682 "impossible packet length", 683 len, 684 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 685 error = EFBIG; 686 goto errout; 687 } 688 auio.uio_resid = len; 689 do { 690 rcvflg = MSG_WAITALL; 691 error = (*so->so_receive)(so, (struct mbuf **)0, 692 &auio, mp, (struct mbuf **)0, &rcvflg); 693 } while (error == EWOULDBLOCK || error == EINTR || 694 error == ERESTART); 695 if (!error && auio.uio_resid > 0) { 696 if (len != auio.uio_resid) 697 log(LOG_INFO, 698 "short receive (%lu/%d) from nfs server %s\n", 699 (u_long)len - auio.uio_resid, len, 700 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 701 error = EPIPE; 702 } 703 } else { 704 /* 705 * NB: Since uio_resid is big, MSG_WAITALL is ignored 706 * and soreceive() will return when it has either a 707 * control msg or a data msg. 708 * We have no use for control msg., but must grab them 709 * and then throw them away so we know what is going 710 * on. 711 */ 712 auio.uio_resid = len = 100000000; /* Anything Big */ 713 auio.uio_lwp = l; 714 do { 715 rcvflg = 0; 716 error = (*so->so_receive)(so, (struct mbuf **)0, 717 &auio, mp, &control, &rcvflg); 718 if (control) 719 m_freem(control); 720 if (error == EWOULDBLOCK && rep) { 721 if (rep->r_flags & R_SOFTTERM) 722 return (EINTR); 723 } 724 } while (error == EWOULDBLOCK || 725 (!error && *mp == NULL && control)); 726 if ((rcvflg & MSG_EOR) == 0) 727 printf("Egad!!\n"); 728 if (!error && *mp == NULL) 729 error = EPIPE; 730 len -= auio.uio_resid; 731 } 732 errout: 733 if (error && error != EINTR && error != ERESTART) { 734 m_freem(*mp); 735 *mp = (struct mbuf *)0; 736 if (error != EPIPE) 737 log(LOG_INFO, 738 "receive error %d from nfs server %s\n", 739 error, 740 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 741 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 742 if (!error) 743 error = nfs_reconnect(rep, l); 744 if (!error) 745 goto tryagain; 746 else 747 nfs_sndunlock(&rep->r_nmp->nm_iflag); 748 } 749 } else { 750 if ((so = rep->r_nmp->nm_so) == NULL) 751 return (EACCES); 752 if (so->so_state & SS_ISCONNECTED) 753 getnam = (struct mbuf **)0; 754 else 755 getnam = aname; 756 auio.uio_resid = len = 1000000; 757 auio.uio_lwp = l; 758 do { 759 rcvflg = 0; 760 error = (*so->so_receive)(so, getnam, &auio, mp, 761 (struct mbuf **)0, &rcvflg); 762 if (error == EWOULDBLOCK && 763 (rep->r_flags & R_SOFTTERM)) 764 return (EINTR); 765 } while (error == EWOULDBLOCK); 766 len -= auio.uio_resid; 767 if (!error && *mp == NULL) 768 error = EPIPE; 769 } 770 if (error) { 771 m_freem(*mp); 772 *mp = (struct mbuf *)0; 773 } 774 return (error); 775 } 776 777 /* 778 * Implement receipt of reply on a socket. 779 * We must search through the list of received datagrams matching them 780 * with outstanding requests using the xid, until ours is found. 781 */ 782 /* ARGSUSED */ 783 int 784 nfs_reply(myrep, lwp) 785 struct nfsreq *myrep; 786 struct lwp *lwp; 787 { 788 struct nfsreq *rep; 789 struct nfsmount *nmp = myrep->r_nmp; 790 int32_t t1; 791 struct mbuf *mrep, *nam, *md; 792 u_int32_t rxid, *tl; 793 caddr_t dpos, cp2; 794 int error; 795 796 /* 797 * Loop around until we get our own reply 798 */ 799 for (;;) { 800 /* 801 * Lock against other receivers so that I don't get stuck in 802 * sbwait() after someone else has received my reply for me. 803 * Also necessary for connection based protocols to avoid 804 * race conditions during a reconnect. 805 */ 806 error = nfs_rcvlock(myrep); 807 if (error == EALREADY) 808 return (0); 809 if (error) 810 return (error); 811 /* 812 * Get the next Rpc reply off the socket 813 */ 814 nmp->nm_waiters++; 815 error = nfs_receive(myrep, &nam, &mrep, lwp); 816 nfs_rcvunlock(nmp); 817 if (error) { 818 819 if (nmp->nm_iflag & NFSMNT_DISMNT) { 820 /* 821 * Oops, we're going away now.. 822 */ 823 nmp->nm_waiters--; 824 wakeup (&nmp->nm_waiters); 825 return error; 826 } 827 nmp->nm_waiters--; 828 /* 829 * Ignore routing errors on connectionless protocols? ? 830 */ 831 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 832 nmp->nm_so->so_error = 0; 833 #ifdef DEBUG 834 printf("nfs_reply: ignoring error %d\n", error); 835 #endif 836 if (myrep->r_flags & R_GETONEREP) 837 return (0); 838 continue; 839 } 840 return (error); 841 } 842 nmp->nm_waiters--; 843 if (nam) 844 m_freem(nam); 845 846 /* 847 * Get the xid and check that it is an rpc reply 848 */ 849 md = mrep; 850 dpos = mtod(md, caddr_t); 851 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 852 rxid = *tl++; 853 if (*tl != rpc_reply) { 854 #ifndef NFS_V2_ONLY 855 if (nmp->nm_flag & NFSMNT_NQNFS) { 856 if (nqnfs_callback(nmp, mrep, md, dpos, 857 myrep->r_lwp)) 858 nfsstats.rpcinvalid++; 859 } else 860 #endif 861 { 862 nfsstats.rpcinvalid++; 863 m_freem(mrep); 864 } 865 nfsmout: 866 if (myrep->r_flags & R_GETONEREP) 867 return (0); 868 continue; 869 } 870 871 /* 872 * Loop through the request list to match up the reply 873 * Iff no match, just drop the datagram 874 */ 875 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 876 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 877 /* Found it.. */ 878 rep->r_mrep = mrep; 879 rep->r_md = md; 880 rep->r_dpos = dpos; 881 if (nfsrtton) { 882 struct rttl *rt; 883 884 rt = &nfsrtt.rttl[nfsrtt.pos]; 885 rt->proc = rep->r_procnum; 886 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 887 rt->sent = nmp->nm_sent; 888 rt->cwnd = nmp->nm_cwnd; 889 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 890 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 891 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; 892 rt->tstamp = time; 893 if (rep->r_flags & R_TIMING) 894 rt->rtt = rep->r_rtt; 895 else 896 rt->rtt = 1000000; 897 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 898 } 899 /* 900 * Update congestion window. 901 * Do the additive increase of 902 * one rpc/rtt. 903 */ 904 if (nmp->nm_cwnd <= nmp->nm_sent) { 905 nmp->nm_cwnd += 906 (NFS_CWNDSCALE * NFS_CWNDSCALE + 907 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 908 if (nmp->nm_cwnd > NFS_MAXCWND) 909 nmp->nm_cwnd = NFS_MAXCWND; 910 } 911 rep->r_flags &= ~R_SENT; 912 nmp->nm_sent -= NFS_CWNDSCALE; 913 /* 914 * Update rtt using a gain of 0.125 on the mean 915 * and a gain of 0.25 on the deviation. 916 */ 917 if (rep->r_flags & R_TIMING) { 918 /* 919 * Since the timer resolution of 920 * NFS_HZ is so course, it can often 921 * result in r_rtt == 0. Since 922 * r_rtt == N means that the actual 923 * rtt is between N+dt and N+2-dt ticks, 924 * add 1. 925 */ 926 t1 = rep->r_rtt + 1; 927 t1 -= (NFS_SRTT(rep) >> 3); 928 NFS_SRTT(rep) += t1; 929 if (t1 < 0) 930 t1 = -t1; 931 t1 -= (NFS_SDRTT(rep) >> 2); 932 NFS_SDRTT(rep) += t1; 933 } 934 nmp->nm_timeouts = 0; 935 break; 936 } 937 } 938 /* 939 * If not matched to a request, drop it. 940 * If it's mine, get out. 941 */ 942 if (rep == 0) { 943 nfsstats.rpcunexpected++; 944 m_freem(mrep); 945 } else if (rep == myrep) { 946 if (rep->r_mrep == NULL) 947 panic("nfsreply nil"); 948 return (0); 949 } 950 if (myrep->r_flags & R_GETONEREP) 951 return (0); 952 } 953 } 954 955 /* 956 * nfs_request - goes something like this 957 * - fill in request struct 958 * - links it into list 959 * - calls nfs_send() for first transmit 960 * - calls nfs_receive() to get reply 961 * - break down rpc header and return with nfs reply pointed to 962 * by mrep or error 963 * nb: always frees up mreq mbuf list 964 */ 965 int 966 nfs_request(np, mrest, procnum, lwp, cred, mrp, mdp, dposp, rexmitp) 967 struct nfsnode *np; 968 struct mbuf *mrest; 969 int procnum; 970 struct lwp *lwp; 971 struct ucred *cred; 972 struct mbuf **mrp; 973 struct mbuf **mdp; 974 caddr_t *dposp; 975 int *rexmitp; 976 { 977 struct mbuf *m, *mrep; 978 struct nfsreq *rep; 979 u_int32_t *tl; 980 int i; 981 struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); 982 struct mbuf *md, *mheadend; 983 char nickv[RPCX_NICKVERF]; 984 time_t reqtime, waituntil; 985 caddr_t dpos, cp2; 986 int t1, s, error = 0, mrest_len, auth_len, auth_type; 987 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 988 int verf_len, verf_type; 989 u_int32_t xid; 990 char *auth_str, *verf_str; 991 NFSKERBKEY_T key; /* save session key */ 992 struct ucred acred; 993 #ifndef NFS_V2_ONLY 994 int nqlflag, cachable; 995 u_quad_t frev; 996 #endif 997 struct mbuf *mrest_backup = NULL; 998 struct ucred *origcred = NULL; /* XXX: gcc */ 999 boolean_t retry_cred = TRUE; 1000 boolean_t use_opencred = (np->n_flag & NUSEOPENCRED) != 0; 1001 1002 if (rexmitp != NULL) 1003 *rexmitp = 0; 1004 1005 tryagain_cred: 1006 KASSERT(cred != NULL); 1007 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 1008 rep->r_nmp = nmp; 1009 rep->r_lwp = lwp; 1010 rep->r_procnum = procnum; 1011 i = 0; 1012 m = mrest; 1013 while (m) { 1014 i += m->m_len; 1015 m = m->m_next; 1016 } 1017 mrest_len = i; 1018 1019 /* 1020 * Get the RPC header with authorization. 1021 */ 1022 kerbauth: 1023 verf_str = auth_str = (char *)0; 1024 if (nmp->nm_flag & NFSMNT_KERB) { 1025 verf_str = nickv; 1026 verf_len = sizeof (nickv); 1027 auth_type = RPCAUTH_KERB4; 1028 memset((caddr_t)key, 0, sizeof (key)); 1029 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 1030 &auth_len, verf_str, verf_len)) { 1031 error = nfs_getauth(nmp, rep, cred, &auth_str, 1032 &auth_len, verf_str, &verf_len, key); 1033 if (error) { 1034 free((caddr_t)rep, M_NFSREQ); 1035 m_freem(mrest); 1036 return (error); 1037 } 1038 } 1039 retry_cred = FALSE; 1040 } else { 1041 /* AUTH_UNIX */ 1042 uid_t uid; 1043 gid_t gid; 1044 1045 /* 1046 * on the most unix filesystems, permission checks are 1047 * done when the file is open(2)'ed. 1048 * ie. once a file is successfully open'ed, 1049 * following i/o operations never fail with EACCES. 1050 * we try to follow the semantics as far as possible. 1051 * 1052 * note that we expect that the nfs server always grant 1053 * accesses by the file's owner. 1054 */ 1055 origcred = cred; 1056 switch (procnum) { 1057 case NFSPROC_READ: 1058 case NFSPROC_WRITE: 1059 case NFSPROC_COMMIT: 1060 uid = np->n_vattr->va_uid; 1061 gid = np->n_vattr->va_gid; 1062 if (cred->cr_uid == uid && cred->cr_gid == gid) { 1063 retry_cred = FALSE; 1064 break; 1065 } 1066 if (use_opencred) 1067 break; 1068 acred.cr_uid = uid; 1069 acred.cr_gid = gid; 1070 acred.cr_ngroups = 0; 1071 acred.cr_ref = 2; /* Just to be safe.. */ 1072 cred = &acred; 1073 break; 1074 default: 1075 retry_cred = FALSE; 1076 break; 1077 } 1078 /* 1079 * backup mbuf chain if we can need it later to retry. 1080 * 1081 * XXX maybe we can keep a direct reference to 1082 * mrest without doing m_copym, but it's ...ugly. 1083 */ 1084 if (retry_cred) 1085 mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); 1086 auth_type = RPCAUTH_UNIX; 1087 auth_len = (((cred->cr_ngroups > nmp->nm_numgrps) ? 1088 nmp->nm_numgrps : cred->cr_ngroups) << 2) + 1089 5 * NFSX_UNSIGNED; 1090 } 1091 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1092 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1093 if (auth_str) 1094 free(auth_str, M_TEMP); 1095 1096 /* 1097 * For stream protocols, insert a Sun RPC Record Mark. 1098 */ 1099 if (nmp->nm_sotype == SOCK_STREAM) { 1100 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1101 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1102 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1103 } 1104 rep->r_mreq = m; 1105 rep->r_xid = xid; 1106 tryagain: 1107 if (nmp->nm_flag & NFSMNT_SOFT) 1108 rep->r_retry = nmp->nm_retry; 1109 else 1110 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1111 rep->r_rtt = rep->r_rexmit = 0; 1112 if (proct[procnum] > 0) 1113 rep->r_flags = R_TIMING; 1114 else 1115 rep->r_flags = 0; 1116 rep->r_mrep = NULL; 1117 1118 /* 1119 * Do the client side RPC. 1120 */ 1121 nfsstats.rpcrequests++; 1122 /* 1123 * Chain request into list of outstanding requests. Be sure 1124 * to put it LAST so timer finds oldest requests first. 1125 */ 1126 s = splsoftnet(); 1127 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1128 1129 /* Get send time for nqnfs */ 1130 reqtime = time.tv_sec; 1131 1132 /* 1133 * If backing off another request or avoiding congestion, don't 1134 * send this one now but let timer do it. If not timing a request, 1135 * do it now. 1136 */ 1137 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1138 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1139 nmp->nm_sent < nmp->nm_cwnd)) { 1140 splx(s); 1141 if (nmp->nm_soflags & PR_CONNREQUIRED) 1142 error = nfs_sndlock(&nmp->nm_iflag, rep); 1143 if (!error) { 1144 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1145 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, lwp); 1146 if (nmp->nm_soflags & PR_CONNREQUIRED) 1147 nfs_sndunlock(&nmp->nm_iflag); 1148 } 1149 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1150 nmp->nm_sent += NFS_CWNDSCALE; 1151 rep->r_flags |= R_SENT; 1152 } 1153 } else { 1154 splx(s); 1155 rep->r_rtt = -1; 1156 } 1157 1158 /* 1159 * Wait for the reply from our send or the timer's. 1160 */ 1161 if (!error || error == EPIPE) 1162 error = nfs_reply(rep, lwp); 1163 1164 /* 1165 * RPC done, unlink the request. 1166 */ 1167 s = splsoftnet(); 1168 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1169 splx(s); 1170 1171 /* 1172 * Decrement the outstanding request count. 1173 */ 1174 if (rep->r_flags & R_SENT) { 1175 rep->r_flags &= ~R_SENT; /* paranoia */ 1176 nmp->nm_sent -= NFS_CWNDSCALE; 1177 } 1178 1179 if (rexmitp != NULL) { 1180 int rexmit; 1181 1182 if (nmp->nm_sotype != SOCK_DGRAM) 1183 rexmit = (rep->r_flags & R_REXMITTED) != 0; 1184 else 1185 rexmit = rep->r_rexmit; 1186 *rexmitp = rexmit; 1187 } 1188 1189 /* 1190 * If there was a successful reply and a tprintf msg. 1191 * tprintf a response. 1192 */ 1193 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1194 nfs_msg(rep->r_lwp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1195 "is alive again"); 1196 mrep = rep->r_mrep; 1197 md = rep->r_md; 1198 dpos = rep->r_dpos; 1199 if (error) 1200 goto nfsmout; 1201 1202 /* 1203 * break down the rpc header and check if ok 1204 */ 1205 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1206 if (*tl++ == rpc_msgdenied) { 1207 if (*tl == rpc_mismatch) 1208 error = EOPNOTSUPP; 1209 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1210 if (!failed_auth) { 1211 failed_auth++; 1212 mheadend->m_next = (struct mbuf *)0; 1213 m_freem(mrep); 1214 m_freem(rep->r_mreq); 1215 goto kerbauth; 1216 } else 1217 error = EAUTH; 1218 } else 1219 error = EACCES; 1220 m_freem(mrep); 1221 goto nfsmout; 1222 } 1223 1224 /* 1225 * Grab any Kerberos verifier, otherwise just throw it away. 1226 */ 1227 verf_type = fxdr_unsigned(int, *tl++); 1228 i = fxdr_unsigned(int32_t, *tl); 1229 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1230 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1231 if (error) 1232 goto nfsmout; 1233 } else if (i > 0) 1234 nfsm_adv(nfsm_rndup(i)); 1235 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1236 /* 0 == ok */ 1237 if (*tl == 0) { 1238 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1239 if (*tl != 0) { 1240 error = fxdr_unsigned(int, *tl); 1241 switch (error) { 1242 case NFSERR_PERM: 1243 error = EPERM; 1244 break; 1245 1246 case NFSERR_NOENT: 1247 error = ENOENT; 1248 break; 1249 1250 case NFSERR_IO: 1251 error = EIO; 1252 break; 1253 1254 case NFSERR_NXIO: 1255 error = ENXIO; 1256 break; 1257 1258 case NFSERR_ACCES: 1259 error = EACCES; 1260 if (!retry_cred) 1261 break; 1262 m_freem(mrep); 1263 m_freem(rep->r_mreq); 1264 FREE(rep, M_NFSREQ); 1265 use_opencred = !use_opencred; 1266 if (mrest_backup == NULL) 1267 /* m_copym failure */ 1268 return ENOMEM; 1269 mrest = mrest_backup; 1270 mrest_backup = NULL; 1271 cred = origcred; 1272 error = 0; 1273 retry_cred = FALSE; 1274 goto tryagain_cred; 1275 1276 case NFSERR_EXIST: 1277 error = EEXIST; 1278 break; 1279 1280 case NFSERR_XDEV: 1281 error = EXDEV; 1282 break; 1283 1284 case NFSERR_NODEV: 1285 error = ENODEV; 1286 break; 1287 1288 case NFSERR_NOTDIR: 1289 error = ENOTDIR; 1290 break; 1291 1292 case NFSERR_ISDIR: 1293 error = EISDIR; 1294 break; 1295 1296 case NFSERR_INVAL: 1297 error = EINVAL; 1298 break; 1299 1300 case NFSERR_FBIG: 1301 error = EFBIG; 1302 break; 1303 1304 case NFSERR_NOSPC: 1305 error = ENOSPC; 1306 break; 1307 1308 case NFSERR_ROFS: 1309 error = EROFS; 1310 break; 1311 1312 case NFSERR_MLINK: 1313 error = EMLINK; 1314 break; 1315 1316 case NFSERR_TIMEDOUT: 1317 error = ETIMEDOUT; 1318 break; 1319 1320 case NFSERR_NAMETOL: 1321 error = ENAMETOOLONG; 1322 break; 1323 1324 case NFSERR_NOTEMPTY: 1325 error = ENOTEMPTY; 1326 break; 1327 1328 case NFSERR_DQUOT: 1329 error = EDQUOT; 1330 break; 1331 1332 case NFSERR_STALE: 1333 /* 1334 * If the File Handle was stale, invalidate the 1335 * lookup cache, just in case. 1336 */ 1337 error = ESTALE; 1338 cache_purge(NFSTOV(np)); 1339 break; 1340 1341 case NFSERR_REMOTE: 1342 error = EREMOTE; 1343 break; 1344 1345 case NFSERR_WFLUSH: 1346 case NFSERR_BADHANDLE: 1347 case NFSERR_NOT_SYNC: 1348 case NFSERR_BAD_COOKIE: 1349 error = EINVAL; 1350 break; 1351 1352 case NFSERR_NOTSUPP: 1353 error = ENOTSUP; 1354 break; 1355 1356 case NFSERR_TOOSMALL: 1357 case NFSERR_SERVERFAULT: 1358 case NFSERR_BADTYPE: 1359 error = EINVAL; 1360 break; 1361 1362 case NFSERR_TRYLATER: 1363 if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) 1364 break; 1365 m_freem(mrep); 1366 error = 0; 1367 waituntil = time.tv_sec + trylater_delay; 1368 while (time.tv_sec < waituntil) 1369 (void) tsleep((caddr_t)&lbolt, 1370 PSOCK, "nqnfstry", 0); 1371 trylater_delay *= NFS_TRYLATERDELMUL; 1372 if (trylater_delay > NFS_TRYLATERDELMAX) 1373 trylater_delay = NFS_TRYLATERDELMAX; 1374 /* 1375 * RFC1813: 1376 * The client should wait and then try 1377 * the request with a new RPC transaction ID. 1378 */ 1379 nfs_renewxid(rep); 1380 goto tryagain; 1381 1382 case NFSERR_STALEWRITEVERF: 1383 error = EINVAL; 1384 break; 1385 1386 default: 1387 #ifdef DIAGNOSTIC 1388 printf("Invalid rpc error code %d\n", error); 1389 #endif 1390 error = EINVAL; 1391 break; 1392 } 1393 1394 if (nmp->nm_flag & NFSMNT_NFSV3) { 1395 *mrp = mrep; 1396 *mdp = md; 1397 *dposp = dpos; 1398 error |= NFSERR_RETERR; 1399 } else 1400 m_freem(mrep); 1401 goto nfsmout; 1402 } 1403 1404 /* 1405 * note which credential worked to minimize number of retries. 1406 */ 1407 if (use_opencred) 1408 np->n_flag |= NUSEOPENCRED; 1409 else 1410 np->n_flag &= ~NUSEOPENCRED; 1411 1412 #ifndef NFS_V2_ONLY 1413 /* 1414 * For nqnfs, get any lease in reply 1415 */ 1416 if (nmp->nm_flag & NFSMNT_NQNFS) { 1417 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1418 if (*tl) { 1419 nqlflag = fxdr_unsigned(int, *tl); 1420 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1421 cachable = fxdr_unsigned(int, *tl++); 1422 reqtime += fxdr_unsigned(int, *tl++); 1423 if (reqtime > time.tv_sec) { 1424 frev = fxdr_hyper(tl); 1425 nqnfs_clientlease(nmp, np, nqlflag, 1426 cachable, reqtime, frev); 1427 } 1428 } 1429 } 1430 #endif 1431 *mrp = mrep; 1432 *mdp = md; 1433 *dposp = dpos; 1434 1435 KASSERT(error == 0); 1436 goto nfsmout; 1437 } 1438 m_freem(mrep); 1439 error = EPROTONOSUPPORT; 1440 nfsmout: 1441 m_freem(rep->r_mreq); 1442 free((caddr_t)rep, M_NFSREQ); 1443 m_freem(mrest_backup); 1444 return (error); 1445 } 1446 #endif /* NFS */ 1447 1448 /* 1449 * Generate the rpc reply header 1450 * siz arg. is used to decide if adding a cluster is worthwhile 1451 */ 1452 int 1453 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1454 int siz; 1455 struct nfsrv_descript *nd; 1456 struct nfssvc_sock *slp; 1457 int err; 1458 int cache; 1459 u_quad_t *frev; 1460 struct mbuf **mrq; 1461 struct mbuf **mbp; 1462 caddr_t *bposp; 1463 { 1464 u_int32_t *tl; 1465 struct mbuf *mreq; 1466 caddr_t bpos; 1467 struct mbuf *mb; 1468 1469 mreq = m_gethdr(M_WAIT, MT_DATA); 1470 MCLAIM(mreq, &nfs_mowner); 1471 mb = mreq; 1472 /* 1473 * If this is a big reply, use a cluster else 1474 * try and leave leading space for the lower level headers. 1475 */ 1476 siz += RPC_REPLYSIZ; 1477 if (siz >= max_datalen) { 1478 m_clget(mreq, M_WAIT); 1479 } else 1480 mreq->m_data += max_hdr; 1481 tl = mtod(mreq, u_int32_t *); 1482 mreq->m_len = 6 * NFSX_UNSIGNED; 1483 bpos = ((caddr_t)tl) + mreq->m_len; 1484 *tl++ = txdr_unsigned(nd->nd_retxid); 1485 *tl++ = rpc_reply; 1486 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1487 *tl++ = rpc_msgdenied; 1488 if (err & NFSERR_AUTHERR) { 1489 *tl++ = rpc_autherr; 1490 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1491 mreq->m_len -= NFSX_UNSIGNED; 1492 bpos -= NFSX_UNSIGNED; 1493 } else { 1494 *tl++ = rpc_mismatch; 1495 *tl++ = txdr_unsigned(RPC_VER2); 1496 *tl = txdr_unsigned(RPC_VER2); 1497 } 1498 } else { 1499 *tl++ = rpc_msgaccepted; 1500 1501 /* 1502 * For Kerberos authentication, we must send the nickname 1503 * verifier back, otherwise just RPCAUTH_NULL. 1504 */ 1505 if (nd->nd_flag & ND_KERBFULL) { 1506 struct nfsuid *nuidp; 1507 struct timeval ktvin, ktvout; 1508 1509 LIST_FOREACH(nuidp, NUIDHASH(slp, nd->nd_cr.cr_uid), 1510 nu_hash) { 1511 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1512 (!nd->nd_nam2 || netaddr_match( 1513 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1514 nd->nd_nam2))) 1515 break; 1516 } 1517 if (nuidp) { 1518 ktvin.tv_sec = 1519 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1520 - 1); 1521 ktvin.tv_usec = 1522 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1523 1524 /* 1525 * Encrypt the timestamp in ecb mode using the 1526 * session key. 1527 */ 1528 #ifdef NFSKERB 1529 XXX 1530 #endif 1531 1532 *tl++ = rpc_auth_kerb; 1533 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1534 *tl = ktvout.tv_sec; 1535 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1536 *tl++ = ktvout.tv_usec; 1537 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1538 } else { 1539 *tl++ = 0; 1540 *tl++ = 0; 1541 } 1542 } else { 1543 *tl++ = 0; 1544 *tl++ = 0; 1545 } 1546 switch (err) { 1547 case EPROGUNAVAIL: 1548 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1549 break; 1550 case EPROGMISMATCH: 1551 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1552 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1553 if (nd->nd_flag & ND_NQNFS) { 1554 *tl++ = txdr_unsigned(3); 1555 *tl = txdr_unsigned(3); 1556 } else { 1557 *tl++ = txdr_unsigned(2); 1558 *tl = txdr_unsigned(3); 1559 } 1560 break; 1561 case EPROCUNAVAIL: 1562 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1563 break; 1564 case EBADRPC: 1565 *tl = txdr_unsigned(RPC_GARBAGE); 1566 break; 1567 default: 1568 *tl = 0; 1569 if (err != NFSERR_RETVOID) { 1570 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1571 if (err) 1572 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1573 else 1574 *tl = 0; 1575 } 1576 break; 1577 }; 1578 } 1579 1580 /* 1581 * For nqnfs, piggyback lease as requested. 1582 */ 1583 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1584 if (nd->nd_flag & ND_LEASE) { 1585 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1586 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1587 *tl++ = txdr_unsigned(cache); 1588 *tl++ = txdr_unsigned(nd->nd_duration); 1589 txdr_hyper(*frev, tl); 1590 } else { 1591 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1592 *tl = 0; 1593 } 1594 } 1595 if (mrq != NULL) 1596 *mrq = mreq; 1597 *mbp = mb; 1598 *bposp = bpos; 1599 if (err != 0 && err != NFSERR_RETVOID) 1600 nfsstats.srvrpc_errs++; 1601 return (0); 1602 } 1603 1604 /* 1605 * Nfs timer routine 1606 * Scan the nfsreq list and retranmit any requests that have timed out 1607 * To avoid retransmission attempts on STREAM sockets (in the future) make 1608 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1609 */ 1610 void 1611 nfs_timer(arg) 1612 void *arg; /* never used */ 1613 { 1614 struct nfsreq *rep; 1615 struct mbuf *m; 1616 struct socket *so; 1617 struct nfsmount *nmp; 1618 int timeo; 1619 int s, error; 1620 #ifdef NFSSERVER 1621 struct nfssvc_sock *slp; 1622 static long lasttime = 0; 1623 u_quad_t cur_usec; 1624 #endif 1625 1626 s = splsoftnet(); 1627 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1628 nmp = rep->r_nmp; 1629 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1630 continue; 1631 if (nfs_sigintr(nmp, rep, rep->r_lwp)) { 1632 rep->r_flags |= R_SOFTTERM; 1633 continue; 1634 } 1635 if (rep->r_rtt >= 0) { 1636 rep->r_rtt++; 1637 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1638 timeo = nmp->nm_timeo; 1639 else 1640 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1641 if (nmp->nm_timeouts > 0) 1642 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1643 if (rep->r_rtt <= timeo) 1644 continue; 1645 if (nmp->nm_timeouts < 1646 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1647 nmp->nm_timeouts++; 1648 } 1649 /* 1650 * Check for server not responding 1651 */ 1652 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1653 rep->r_rexmit > nmp->nm_deadthresh) { 1654 nfs_msg(rep->r_lwp, 1655 nmp->nm_mountp->mnt_stat.f_mntfromname, 1656 "not responding"); 1657 rep->r_flags |= R_TPRINTFMSG; 1658 } 1659 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1660 nfsstats.rpctimeouts++; 1661 rep->r_flags |= R_SOFTTERM; 1662 continue; 1663 } 1664 if (nmp->nm_sotype != SOCK_DGRAM) { 1665 if (++rep->r_rexmit > NFS_MAXREXMIT) 1666 rep->r_rexmit = NFS_MAXREXMIT; 1667 continue; 1668 } 1669 if ((so = nmp->nm_so) == NULL) 1670 continue; 1671 1672 /* 1673 * If there is enough space and the window allows.. 1674 * Resend it 1675 * Set r_rtt to -1 in case we fail to send it now. 1676 */ 1677 rep->r_rtt = -1; 1678 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1679 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1680 (rep->r_flags & R_SENT) || 1681 nmp->nm_sent < nmp->nm_cwnd) && 1682 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1683 if (so->so_state & SS_ISCONNECTED) 1684 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1685 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 1686 else 1687 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1688 nmp->nm_nam, (struct mbuf *)0, (struct lwp *)0); 1689 if (error) { 1690 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1691 #ifdef DEBUG 1692 printf("nfs_timer: ignoring error %d\n", 1693 error); 1694 #endif 1695 so->so_error = 0; 1696 } 1697 } else { 1698 /* 1699 * Iff first send, start timing 1700 * else turn timing off, backoff timer 1701 * and divide congestion window by 2. 1702 */ 1703 if (rep->r_flags & R_SENT) { 1704 rep->r_flags &= ~R_TIMING; 1705 if (++rep->r_rexmit > NFS_MAXREXMIT) 1706 rep->r_rexmit = NFS_MAXREXMIT; 1707 nmp->nm_cwnd >>= 1; 1708 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1709 nmp->nm_cwnd = NFS_CWNDSCALE; 1710 nfsstats.rpcretries++; 1711 } else { 1712 rep->r_flags |= R_SENT; 1713 nmp->nm_sent += NFS_CWNDSCALE; 1714 } 1715 rep->r_rtt = 0; 1716 } 1717 } 1718 } 1719 1720 #ifdef NFSSERVER 1721 /* 1722 * Call the nqnfs server timer once a second to handle leases. 1723 */ 1724 if (lasttime != time.tv_sec) { 1725 lasttime = time.tv_sec; 1726 nqnfs_serverd(); 1727 } 1728 1729 /* 1730 * Scan the write gathering queues for writes that need to be 1731 * completed now. 1732 */ 1733 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec; 1734 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1735 if (LIST_FIRST(&slp->ns_tq) && 1736 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) 1737 nfsrv_wakenfsd(slp); 1738 } 1739 #endif /* NFSSERVER */ 1740 splx(s); 1741 callout_schedule(&nfs_timer_ch, nfs_ticks); 1742 } 1743 1744 /*ARGSUSED*/ 1745 void 1746 nfs_exit(p, v) 1747 struct proc *p; 1748 void *v; 1749 { 1750 struct nfsreq *rp; 1751 int s = splsoftnet(); 1752 1753 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 1754 if (rp->r_lwp && rp->r_lwp->l_proc == p) 1755 TAILQ_REMOVE(&nfs_reqq, rp, r_chain); 1756 } 1757 splx(s); 1758 } 1759 1760 /* 1761 * Test for a termination condition pending on the process. 1762 * This is used for NFSMNT_INT mounts. 1763 */ 1764 int 1765 nfs_sigintr(nmp, rep, l) 1766 struct nfsmount *nmp; 1767 struct nfsreq *rep; 1768 struct lwp *l; 1769 { 1770 sigset_t ss; 1771 1772 if (rep && (rep->r_flags & R_SOFTTERM)) 1773 return (EINTR); 1774 if (!(nmp->nm_flag & NFSMNT_INT)) 1775 return (0); 1776 if (l) { 1777 sigpending1(l->l_proc, &ss); 1778 #if 0 1779 sigminusset(&l->l_proc->p_sigctx.ps_sigignore, &ss); 1780 #endif 1781 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1782 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1783 sigismember(&ss, SIGQUIT)) 1784 return (EINTR); 1785 } 1786 return (0); 1787 } 1788 1789 /* 1790 * Lock a socket against others. 1791 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1792 * and also to avoid race conditions between the processes with nfs requests 1793 * in progress when a reconnect is necessary. 1794 */ 1795 int 1796 nfs_sndlock(flagp, rep) 1797 int *flagp; 1798 struct nfsreq *rep; 1799 { 1800 struct lwp *l; 1801 int slpflag = 0, slptimeo = 0; 1802 1803 if (rep) { 1804 l = rep->r_lwp; 1805 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1806 slpflag = PCATCH; 1807 } else 1808 l = (struct lwp *)0; 1809 while (*flagp & NFSMNT_SNDLOCK) { 1810 if (rep && nfs_sigintr(rep->r_nmp, rep, l)) 1811 return (EINTR); 1812 *flagp |= NFSMNT_WANTSND; 1813 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1814 slptimeo); 1815 if (slpflag == PCATCH) { 1816 slpflag = 0; 1817 slptimeo = 2 * hz; 1818 } 1819 } 1820 *flagp |= NFSMNT_SNDLOCK; 1821 return (0); 1822 } 1823 1824 /* 1825 * Unlock the stream socket for others. 1826 */ 1827 void 1828 nfs_sndunlock(flagp) 1829 int *flagp; 1830 { 1831 1832 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1833 panic("nfs sndunlock"); 1834 *flagp &= ~NFSMNT_SNDLOCK; 1835 if (*flagp & NFSMNT_WANTSND) { 1836 *flagp &= ~NFSMNT_WANTSND; 1837 wakeup((caddr_t)flagp); 1838 } 1839 } 1840 1841 int 1842 nfs_rcvlock(rep) 1843 struct nfsreq *rep; 1844 { 1845 struct nfsmount *nmp = rep->r_nmp; 1846 int *flagp = &nmp->nm_iflag; 1847 int slpflag, slptimeo = 0; 1848 int error = 0; 1849 1850 if (*flagp & NFSMNT_DISMNT) 1851 return EIO; 1852 1853 if (*flagp & NFSMNT_INT) 1854 slpflag = PCATCH; 1855 else 1856 slpflag = 0; 1857 simple_lock(&nmp->nm_slock); 1858 while (*flagp & NFSMNT_RCVLOCK) { 1859 if (nfs_sigintr(rep->r_nmp, rep, rep->r_lwp)) { 1860 error = EINTR; 1861 goto quit; 1862 } 1863 *flagp |= NFSMNT_WANTRCV; 1864 nmp->nm_waiters++; 1865 (void) ltsleep(flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1866 slptimeo, &nmp->nm_slock); 1867 nmp->nm_waiters--; 1868 if (*flagp & NFSMNT_DISMNT) { 1869 wakeup(&nmp->nm_waiters); 1870 error = EIO; 1871 goto quit; 1872 } 1873 /* If our reply was received while we were sleeping, 1874 * then just return without taking the lock to avoid a 1875 * situation where a single iod could 'capture' the 1876 * receive lock. 1877 */ 1878 if (rep->r_mrep != NULL) { 1879 error = EALREADY; 1880 goto quit; 1881 } 1882 if (slpflag == PCATCH) { 1883 slpflag = 0; 1884 slptimeo = 2 * hz; 1885 } 1886 } 1887 *flagp |= NFSMNT_RCVLOCK; 1888 quit: 1889 simple_unlock(&nmp->nm_slock); 1890 return error; 1891 } 1892 1893 /* 1894 * Unlock the stream socket for others. 1895 */ 1896 void 1897 nfs_rcvunlock(nmp) 1898 struct nfsmount *nmp; 1899 { 1900 int *flagp = &nmp->nm_iflag; 1901 1902 simple_lock(&nmp->nm_slock); 1903 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1904 panic("nfs rcvunlock"); 1905 *flagp &= ~NFSMNT_RCVLOCK; 1906 if (*flagp & NFSMNT_WANTRCV) { 1907 *flagp &= ~NFSMNT_WANTRCV; 1908 wakeup((caddr_t)flagp); 1909 } 1910 simple_unlock(&nmp->nm_slock); 1911 } 1912 1913 /* 1914 * Parse an RPC request 1915 * - verify it 1916 * - fill in the cred struct. 1917 */ 1918 int 1919 nfs_getreq(nd, nfsd, has_header) 1920 struct nfsrv_descript *nd; 1921 struct nfsd *nfsd; 1922 int has_header; 1923 { 1924 int len, i; 1925 u_int32_t *tl; 1926 int32_t t1; 1927 struct uio uio; 1928 struct iovec iov; 1929 caddr_t dpos, cp2, cp; 1930 u_int32_t nfsvers, auth_type; 1931 uid_t nickuid; 1932 int error = 0, nqnfs = 0, ticklen; 1933 struct mbuf *mrep, *md; 1934 struct nfsuid *nuidp; 1935 struct timeval tvin, tvout; 1936 1937 mrep = nd->nd_mrep; 1938 md = nd->nd_md; 1939 dpos = nd->nd_dpos; 1940 if (has_header) { 1941 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1942 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1943 if (*tl++ != rpc_call) { 1944 m_freem(mrep); 1945 return (EBADRPC); 1946 } 1947 } else 1948 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1949 nd->nd_repstat = 0; 1950 nd->nd_flag = 0; 1951 if (*tl++ != rpc_vers) { 1952 nd->nd_repstat = ERPCMISMATCH; 1953 nd->nd_procnum = NFSPROC_NOOP; 1954 return (0); 1955 } 1956 if (*tl != nfs_prog) { 1957 if (*tl == nqnfs_prog) 1958 nqnfs++; 1959 else { 1960 nd->nd_repstat = EPROGUNAVAIL; 1961 nd->nd_procnum = NFSPROC_NOOP; 1962 return (0); 1963 } 1964 } 1965 tl++; 1966 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1967 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1968 (nfsvers != NQNFS_VER3 && nqnfs)) { 1969 nd->nd_repstat = EPROGMISMATCH; 1970 nd->nd_procnum = NFSPROC_NOOP; 1971 return (0); 1972 } 1973 if (nqnfs) 1974 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1975 else if (nfsvers == NFS_VER3) 1976 nd->nd_flag = ND_NFSV3; 1977 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1978 if (nd->nd_procnum == NFSPROC_NULL) 1979 return (0); 1980 if (nd->nd_procnum >= NFS_NPROCS || 1981 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1982 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1983 nd->nd_repstat = EPROCUNAVAIL; 1984 nd->nd_procnum = NFSPROC_NOOP; 1985 return (0); 1986 } 1987 if ((nd->nd_flag & ND_NFSV3) == 0) 1988 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1989 auth_type = *tl++; 1990 len = fxdr_unsigned(int, *tl++); 1991 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1992 m_freem(mrep); 1993 return (EBADRPC); 1994 } 1995 1996 nd->nd_flag &= ~ND_KERBAUTH; 1997 /* 1998 * Handle auth_unix or auth_kerb. 1999 */ 2000 if (auth_type == rpc_auth_unix) { 2001 len = fxdr_unsigned(int, *++tl); 2002 if (len < 0 || len > NFS_MAXNAMLEN) { 2003 m_freem(mrep); 2004 return (EBADRPC); 2005 } 2006 nfsm_adv(nfsm_rndup(len)); 2007 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2008 memset((caddr_t)&nd->nd_cr, 0, sizeof (struct ucred)); 2009 nd->nd_cr.cr_ref = 1; 2010 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 2011 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 2012 len = fxdr_unsigned(int, *tl); 2013 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2014 m_freem(mrep); 2015 return (EBADRPC); 2016 } 2017 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 2018 for (i = 0; i < len; i++) 2019 if (i < NGROUPS) 2020 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 2021 else 2022 tl++; 2023 nd->nd_cr.cr_ngroups = (len > NGROUPS) ? NGROUPS : len; 2024 if (nd->nd_cr.cr_ngroups > 1) 2025 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 2026 len = fxdr_unsigned(int, *++tl); 2027 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2028 m_freem(mrep); 2029 return (EBADRPC); 2030 } 2031 if (len > 0) 2032 nfsm_adv(nfsm_rndup(len)); 2033 } else if (auth_type == rpc_auth_kerb) { 2034 switch (fxdr_unsigned(int, *tl++)) { 2035 case RPCAKN_FULLNAME: 2036 ticklen = fxdr_unsigned(int, *tl); 2037 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2038 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2039 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2040 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2041 m_freem(mrep); 2042 return (EBADRPC); 2043 } 2044 uio.uio_offset = 0; 2045 uio.uio_iov = &iov; 2046 uio.uio_iovcnt = 1; 2047 uio.uio_segflg = UIO_SYSSPACE; 2048 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 2049 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2050 nfsm_mtouio(&uio, uio.uio_resid); 2051 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2052 if (*tl++ != rpc_auth_kerb || 2053 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2054 printf("Bad kerb verifier\n"); 2055 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2056 nd->nd_procnum = NFSPROC_NOOP; 2057 return (0); 2058 } 2059 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 2060 tl = (u_int32_t *)cp; 2061 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2062 printf("Not fullname kerb verifier\n"); 2063 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2064 nd->nd_procnum = NFSPROC_NOOP; 2065 return (0); 2066 } 2067 cp += NFSX_UNSIGNED; 2068 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 2069 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2070 nd->nd_flag |= ND_KERBFULL; 2071 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2072 break; 2073 case RPCAKN_NICKNAME: 2074 if (len != 2 * NFSX_UNSIGNED) { 2075 printf("Kerb nickname short\n"); 2076 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2077 nd->nd_procnum = NFSPROC_NOOP; 2078 return (0); 2079 } 2080 nickuid = fxdr_unsigned(uid_t, *tl); 2081 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2082 if (*tl++ != rpc_auth_kerb || 2083 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2084 printf("Kerb nick verifier bad\n"); 2085 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2086 nd->nd_procnum = NFSPROC_NOOP; 2087 return (0); 2088 } 2089 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2090 tvin.tv_sec = *tl++; 2091 tvin.tv_usec = *tl; 2092 2093 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 2094 nu_hash) { 2095 if (nuidp->nu_cr.cr_uid == nickuid && 2096 (!nd->nd_nam2 || 2097 netaddr_match(NU_NETFAM(nuidp), 2098 &nuidp->nu_haddr, nd->nd_nam2))) 2099 break; 2100 } 2101 if (!nuidp) { 2102 nd->nd_repstat = 2103 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2104 nd->nd_procnum = NFSPROC_NOOP; 2105 return (0); 2106 } 2107 2108 /* 2109 * Now, decrypt the timestamp using the session key 2110 * and validate it. 2111 */ 2112 #ifdef NFSKERB 2113 XXX 2114 #endif 2115 2116 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2117 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2118 if (nuidp->nu_expire < time.tv_sec || 2119 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2120 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2121 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2122 nuidp->nu_expire = 0; 2123 nd->nd_repstat = 2124 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2125 nd->nd_procnum = NFSPROC_NOOP; 2126 return (0); 2127 } 2128 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 2129 nd->nd_flag |= ND_KERBNICK; 2130 }; 2131 } else { 2132 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2133 nd->nd_procnum = NFSPROC_NOOP; 2134 return (0); 2135 } 2136 2137 /* 2138 * For nqnfs, get piggybacked lease request. 2139 */ 2140 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 2141 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2142 nd->nd_flag |= fxdr_unsigned(int, *tl); 2143 if (nd->nd_flag & ND_LEASE) { 2144 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2145 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 2146 } else 2147 nd->nd_duration = NQ_MINLEASE; 2148 } else 2149 nd->nd_duration = NQ_MINLEASE; 2150 nd->nd_md = md; 2151 nd->nd_dpos = dpos; 2152 return (0); 2153 nfsmout: 2154 return (error); 2155 } 2156 2157 int 2158 nfs_msg(l, server, msg) 2159 struct lwp *l; 2160 const char *server, *msg; 2161 { 2162 tpr_t tpr; 2163 2164 if (l) 2165 tpr = tprintf_open(l->l_proc); 2166 else 2167 tpr = NULL; 2168 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2169 tprintf_close(tpr); 2170 return (0); 2171 } 2172 2173 #ifdef NFSSERVER 2174 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 2175 struct nfssvc_sock *, struct lwp *, 2176 struct mbuf **)) = { 2177 nfsrv_null, 2178 nfsrv_getattr, 2179 nfsrv_setattr, 2180 nfsrv_lookup, 2181 nfsrv3_access, 2182 nfsrv_readlink, 2183 nfsrv_read, 2184 nfsrv_write, 2185 nfsrv_create, 2186 nfsrv_mkdir, 2187 nfsrv_symlink, 2188 nfsrv_mknod, 2189 nfsrv_remove, 2190 nfsrv_rmdir, 2191 nfsrv_rename, 2192 nfsrv_link, 2193 nfsrv_readdir, 2194 nfsrv_readdirplus, 2195 nfsrv_statfs, 2196 nfsrv_fsinfo, 2197 nfsrv_pathconf, 2198 nfsrv_commit, 2199 nqnfsrv_getlease, 2200 nqnfsrv_vacated, 2201 nfsrv_noop, 2202 nfsrv_noop 2203 }; 2204 2205 /* 2206 * Socket upcall routine for the nfsd sockets. 2207 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2208 * Essentially do as much as possible non-blocking, else punt and it will 2209 * be called with M_WAIT from an nfsd. 2210 */ 2211 void 2212 nfsrv_rcv(so, arg, waitflag) 2213 struct socket *so; 2214 caddr_t arg; 2215 int waitflag; 2216 { 2217 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2218 struct mbuf *m; 2219 struct mbuf *mp, *nam; 2220 struct uio auio; 2221 int flags, error; 2222 2223 if ((slp->ns_flag & SLP_VALID) == 0) 2224 return; 2225 #if 1 2226 /* 2227 * Define this to test for nfsds handling this under heavy load. 2228 */ 2229 if (waitflag == M_DONTWAIT) { 2230 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 2231 } 2232 #endif 2233 /* XXX: was NULL, soreceive() requires non-NULL uio->uio_lwp */ 2234 auio.uio_lwp = curlwp; /* XXX curlwp */ 2235 if (so->so_type == SOCK_STREAM) { 2236 /* 2237 * If there are already records on the queue, defer soreceive() 2238 * to an nfsd so that there is feedback to the TCP layer that 2239 * the nfs servers are heavily loaded. 2240 */ 2241 if (slp->ns_rec && waitflag == M_DONTWAIT) { 2242 slp->ns_flag |= SLP_NEEDQ; 2243 goto dorecs; 2244 } 2245 2246 /* 2247 * Do soreceive(). 2248 */ 2249 auio.uio_resid = 1000000000; 2250 flags = MSG_DONTWAIT; 2251 error = (*so->so_receive)(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 2252 if (error || mp == (struct mbuf *)0) { 2253 if (error == EWOULDBLOCK) 2254 slp->ns_flag |= SLP_NEEDQ; 2255 else 2256 slp->ns_flag |= SLP_DISCONN; 2257 goto dorecs; 2258 } 2259 m = mp; 2260 if (slp->ns_rawend) { 2261 slp->ns_rawend->m_next = m; 2262 slp->ns_cc += 1000000000 - auio.uio_resid; 2263 } else { 2264 slp->ns_raw = m; 2265 slp->ns_cc = 1000000000 - auio.uio_resid; 2266 } 2267 while (m->m_next) 2268 m = m->m_next; 2269 slp->ns_rawend = m; 2270 2271 /* 2272 * Now try and parse record(s) out of the raw stream data. 2273 */ 2274 error = nfsrv_getstream(slp, waitflag); 2275 if (error) { 2276 if (error == EPERM) 2277 slp->ns_flag |= SLP_DISCONN; 2278 else 2279 slp->ns_flag |= SLP_NEEDQ; 2280 } 2281 } else { 2282 do { 2283 auio.uio_resid = 1000000000; 2284 flags = MSG_DONTWAIT; 2285 error = (*so->so_receive)(so, &nam, &auio, &mp, 2286 (struct mbuf **)0, &flags); 2287 if (mp) { 2288 if (nam) { 2289 m = nam; 2290 m->m_next = mp; 2291 } else 2292 m = mp; 2293 if (slp->ns_recend) 2294 slp->ns_recend->m_nextpkt = m; 2295 else 2296 slp->ns_rec = m; 2297 slp->ns_recend = m; 2298 m->m_nextpkt = (struct mbuf *)0; 2299 } 2300 if (error) { 2301 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2302 && error != EWOULDBLOCK) { 2303 slp->ns_flag |= SLP_DISCONN; 2304 goto dorecs; 2305 } 2306 } 2307 } while (mp); 2308 } 2309 2310 /* 2311 * Now try and process the request records, non-blocking. 2312 */ 2313 dorecs: 2314 if (waitflag == M_DONTWAIT && 2315 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2316 nfsrv_wakenfsd(slp); 2317 } 2318 2319 /* 2320 * Try and extract an RPC request from the mbuf data list received on a 2321 * stream socket. The "waitflag" argument indicates whether or not it 2322 * can sleep. 2323 */ 2324 int 2325 nfsrv_getstream(slp, waitflag) 2326 struct nfssvc_sock *slp; 2327 int waitflag; 2328 { 2329 struct mbuf *m, **mpp; 2330 struct mbuf *recm; 2331 u_int32_t recmark; 2332 2333 if (slp->ns_flag & SLP_GETSTREAM) 2334 panic("nfs getstream"); 2335 slp->ns_flag |= SLP_GETSTREAM; 2336 for (;;) { 2337 if (slp->ns_reclen == 0) { 2338 if (slp->ns_cc < NFSX_UNSIGNED) { 2339 slp->ns_flag &= ~SLP_GETSTREAM; 2340 return (0); 2341 } 2342 m = slp->ns_raw; 2343 m_copydata(m, 0, NFSX_UNSIGNED, (caddr_t)&recmark); 2344 m_adj(m, NFSX_UNSIGNED); 2345 slp->ns_cc -= NFSX_UNSIGNED; 2346 recmark = ntohl(recmark); 2347 slp->ns_reclen = recmark & ~0x80000000; 2348 if (recmark & 0x80000000) 2349 slp->ns_flag |= SLP_LASTFRAG; 2350 else 2351 slp->ns_flag &= ~SLP_LASTFRAG; 2352 if (slp->ns_reclen > NFS_MAXPACKET) { 2353 slp->ns_flag &= ~SLP_GETSTREAM; 2354 return (EPERM); 2355 } 2356 } 2357 2358 /* 2359 * Now get the record part. 2360 * 2361 * Note that slp->ns_reclen may be 0. Linux sometimes 2362 * generates 0-length records. 2363 */ 2364 if (slp->ns_cc == slp->ns_reclen) { 2365 recm = slp->ns_raw; 2366 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2367 slp->ns_cc = slp->ns_reclen = 0; 2368 } else if (slp->ns_cc > slp->ns_reclen) { 2369 recm = slp->ns_raw; 2370 m = m_split(recm, slp->ns_reclen, waitflag); 2371 if (m == NULL) { 2372 slp->ns_flag &= ~SLP_GETSTREAM; 2373 return (EWOULDBLOCK); 2374 } 2375 m_claimm(recm, &nfs_mowner); 2376 slp->ns_raw = m; 2377 if (m->m_next == NULL) 2378 slp->ns_rawend = m; 2379 slp->ns_cc -= slp->ns_reclen; 2380 slp->ns_reclen = 0; 2381 } else { 2382 slp->ns_flag &= ~SLP_GETSTREAM; 2383 return (0); 2384 } 2385 2386 /* 2387 * Accumulate the fragments into a record. 2388 */ 2389 mpp = &slp->ns_frag; 2390 while (*mpp) 2391 mpp = &((*mpp)->m_next); 2392 *mpp = recm; 2393 if (slp->ns_flag & SLP_LASTFRAG) { 2394 if (slp->ns_recend) 2395 slp->ns_recend->m_nextpkt = slp->ns_frag; 2396 else 2397 slp->ns_rec = slp->ns_frag; 2398 slp->ns_recend = slp->ns_frag; 2399 slp->ns_frag = (struct mbuf *)0; 2400 } 2401 } 2402 } 2403 2404 /* 2405 * Parse an RPC header. 2406 */ 2407 int 2408 nfsrv_dorec(slp, nfsd, ndp) 2409 struct nfssvc_sock *slp; 2410 struct nfsd *nfsd; 2411 struct nfsrv_descript **ndp; 2412 { 2413 struct mbuf *m, *nam; 2414 struct nfsrv_descript *nd; 2415 int error; 2416 2417 *ndp = NULL; 2418 if ((slp->ns_flag & SLP_VALID) == 0 || 2419 (m = slp->ns_rec) == (struct mbuf *)0) 2420 return (ENOBUFS); 2421 slp->ns_rec = m->m_nextpkt; 2422 if (slp->ns_rec) 2423 m->m_nextpkt = (struct mbuf *)0; 2424 else 2425 slp->ns_recend = (struct mbuf *)0; 2426 if (m->m_type == MT_SONAME) { 2427 nam = m; 2428 m = m->m_next; 2429 nam->m_next = NULL; 2430 } else 2431 nam = NULL; 2432 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2433 nd->nd_md = nd->nd_mrep = m; 2434 nd->nd_nam2 = nam; 2435 nd->nd_dpos = mtod(m, caddr_t); 2436 error = nfs_getreq(nd, nfsd, TRUE); 2437 if (error) { 2438 m_freem(nam); 2439 pool_put(&nfs_srvdesc_pool, nd); 2440 return (error); 2441 } 2442 *ndp = nd; 2443 nfsd->nfsd_nd = nd; 2444 return (0); 2445 } 2446 2447 2448 /* 2449 * Search for a sleeping nfsd and wake it up. 2450 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2451 * running nfsds will go look for the work in the nfssvc_sock list. 2452 */ 2453 void 2454 nfsrv_wakenfsd(slp) 2455 struct nfssvc_sock *slp; 2456 { 2457 struct nfsd *nd; 2458 2459 if ((slp->ns_flag & SLP_VALID) == 0) 2460 return; 2461 simple_lock(&nfsd_slock); 2462 if (slp->ns_flag & SLP_DOREC) { 2463 simple_unlock(&nfsd_slock); 2464 return; 2465 } 2466 nd = SLIST_FIRST(&nfsd_idle_head); 2467 if (nd) { 2468 SLIST_REMOVE_HEAD(&nfsd_idle_head, nfsd_idle); 2469 simple_unlock(&nfsd_slock); 2470 2471 KASSERT(nd->nfsd_flag & NFSD_WAITING); 2472 nd->nfsd_flag &= ~NFSD_WAITING; 2473 if (nd->nfsd_slp) 2474 panic("nfsd wakeup"); 2475 slp->ns_sref++; 2476 nd->nfsd_slp = slp; 2477 wakeup(nd); 2478 return; 2479 } 2480 slp->ns_flag |= SLP_DOREC; 2481 nfsd_head_flag |= NFSD_CHECKSLP; 2482 TAILQ_INSERT_TAIL(&nfssvc_sockpending, slp, ns_pending); 2483 simple_unlock(&nfsd_slock); 2484 } 2485 #endif /* NFSSERVER */ 2486