1 /* $NetBSD: nfs_socket.c,v 1.98 2003/08/16 18:09:14 yamt 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 1.98 2003/08/16 18:09:14 yamt 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; 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) 158 struct nfsmount *nmp; 159 struct nfsreq *rep; 160 { 161 struct socket *so; 162 int s, error, rcvreserve, sndreserve; 163 struct sockaddr *saddr; 164 struct sockaddr_in *sin; 165 #ifdef INET6 166 struct sockaddr_in6 *sin6; 167 #endif 168 struct mbuf *m; 169 170 nmp->nm_so = (struct socket *)0; 171 saddr = mtod(nmp->nm_nam, struct sockaddr *); 172 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 173 nmp->nm_soproto); 174 if (error) 175 goto bad; 176 so = nmp->nm_so; 177 #ifdef MBUFTRACE 178 so->so_mowner = &nfs_mowner; 179 so->so_rcv.sb_mowner = &nfs_mowner; 180 so->so_snd.sb_mowner = &nfs_mowner; 181 #endif 182 nmp->nm_soflags = so->so_proto->pr_flags; 183 184 /* 185 * Some servers require that the client port be a reserved port number. 186 */ 187 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 188 m = m_get(M_WAIT, MT_SOOPTS); 189 MCLAIM(m, so->so_mowner); 190 *mtod(m, int32_t *) = IP_PORTRANGE_LOW; 191 m->m_len = sizeof(int32_t); 192 if ((error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, m))) 193 goto bad; 194 m = m_get(M_WAIT, MT_SONAME); 195 MCLAIM(m, so->so_mowner); 196 sin = mtod(m, struct sockaddr_in *); 197 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 198 sin->sin_family = AF_INET; 199 sin->sin_addr.s_addr = INADDR_ANY; 200 sin->sin_port = 0; 201 error = sobind(so, m, &proc0); 202 m_freem(m); 203 if (error) 204 goto bad; 205 } 206 #ifdef INET6 207 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 208 m = m_get(M_WAIT, MT_SOOPTS); 209 MCLAIM(m, so->so_mowner); 210 *mtod(m, int32_t *) = IPV6_PORTRANGE_LOW; 211 m->m_len = sizeof(int32_t); 212 if ((error = sosetopt(so, IPPROTO_IPV6, IPV6_PORTRANGE, m))) 213 goto bad; 214 m = m_get(M_WAIT, MT_SONAME); 215 MCLAIM(m, so->so_mowner); 216 sin6 = mtod(m, struct sockaddr_in6 *); 217 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 218 sin6->sin6_family = AF_INET6; 219 sin6->sin6_addr = in6addr_any; 220 sin6->sin6_port = 0; 221 error = sobind(so, m, &proc0); 222 m_freem(m); 223 if (error) 224 goto bad; 225 } 226 #endif 227 228 /* 229 * Protocols that do not require connections may be optionally left 230 * unconnected for servers that reply from a port other than NFS_PORT. 231 */ 232 if (nmp->nm_flag & NFSMNT_NOCONN) { 233 if (nmp->nm_soflags & PR_CONNREQUIRED) { 234 error = ENOTCONN; 235 goto bad; 236 } 237 } else { 238 error = soconnect(so, nmp->nm_nam); 239 if (error) 240 goto bad; 241 242 /* 243 * Wait for the connection to complete. Cribbed from the 244 * connect system call but with the wait timing out so 245 * that interruptible mounts don't hang here for a long time. 246 */ 247 s = splsoftnet(); 248 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 249 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 250 "nfscn1", 2 * hz); 251 if ((so->so_state & SS_ISCONNECTING) && 252 so->so_error == 0 && rep && 253 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 254 so->so_state &= ~SS_ISCONNECTING; 255 splx(s); 256 goto bad; 257 } 258 } 259 if (so->so_error) { 260 error = so->so_error; 261 so->so_error = 0; 262 splx(s); 263 goto bad; 264 } 265 splx(s); 266 } 267 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 268 so->so_rcv.sb_timeo = (5 * hz); 269 so->so_snd.sb_timeo = (5 * hz); 270 } else { 271 so->so_rcv.sb_timeo = 0; 272 so->so_snd.sb_timeo = 0; 273 } 274 if (nmp->nm_sotype == SOCK_DGRAM) { 275 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 276 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 277 NFS_MAXPKTHDR) * 2; 278 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 279 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 280 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 281 NFS_MAXPKTHDR) * 2; 282 } else { 283 if (nmp->nm_sotype != SOCK_STREAM) 284 panic("nfscon sotype"); 285 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 286 m = m_get(M_WAIT, MT_SOOPTS); 287 MCLAIM(m, so->so_mowner); 288 *mtod(m, int32_t *) = 1; 289 m->m_len = sizeof(int32_t); 290 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 291 } 292 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 293 m = m_get(M_WAIT, MT_SOOPTS); 294 MCLAIM(m, so->so_mowner); 295 *mtod(m, int32_t *) = 1; 296 m->m_len = sizeof(int32_t); 297 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 298 } 299 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 300 sizeof (u_int32_t)) * 2; 301 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 302 sizeof (u_int32_t)) * 2; 303 } 304 error = soreserve(so, sndreserve, rcvreserve); 305 if (error) 306 goto bad; 307 so->so_rcv.sb_flags |= SB_NOINTR; 308 so->so_snd.sb_flags |= SB_NOINTR; 309 310 /* Initialize other non-zero congestion variables */ 311 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 312 NFS_TIMEO << 3; 313 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 314 nmp->nm_sdrtt[3] = 0; 315 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 316 nmp->nm_sent = 0; 317 nmp->nm_timeouts = 0; 318 return (0); 319 320 bad: 321 nfs_disconnect(nmp); 322 return (error); 323 } 324 325 /* 326 * Reconnect routine: 327 * Called when a connection is broken on a reliable protocol. 328 * - clean up the old socket 329 * - nfs_connect() again 330 * - set R_MUSTRESEND for all outstanding requests on mount point 331 * If this fails the mount point is DEAD! 332 * nb: Must be called with the nfs_sndlock() set on the mount point. 333 */ 334 int 335 nfs_reconnect(rep) 336 struct nfsreq *rep; 337 { 338 struct nfsreq *rp; 339 struct nfsmount *nmp = rep->r_nmp; 340 int error; 341 342 nfs_disconnect(nmp); 343 while ((error = nfs_connect(nmp, rep)) != 0) { 344 if (error == EINTR || error == ERESTART) 345 return (EINTR); 346 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscn2", 0); 347 } 348 349 /* 350 * Loop through outstanding request list and fix up all requests 351 * on old socket. 352 */ 353 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 354 if (rp->r_nmp == nmp) 355 rp->r_flags |= R_MUSTRESEND; 356 } 357 return (0); 358 } 359 360 /* 361 * NFS disconnect. Clean up and unlink. 362 */ 363 void 364 nfs_disconnect(nmp) 365 struct nfsmount *nmp; 366 { 367 struct socket *so; 368 int drain = 0; 369 370 if (nmp->nm_so) { 371 so = nmp->nm_so; 372 nmp->nm_so = (struct socket *)0; 373 soshutdown(so, 2); 374 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 375 if (drain) { 376 /* 377 * soshutdown() above should wake up the current 378 * listener. 379 * Now wake up those waiting for the receive lock, and 380 * wait for them to go away unhappy, to prevent *nmp 381 * from evaporating while they're sleeping. 382 */ 383 while (nmp->nm_waiters > 0) { 384 wakeup (&nmp->nm_iflag); 385 (void) tsleep(&nmp->nm_waiters, PVFS, 386 "nfsdis", 0); 387 } 388 } 389 soclose(so); 390 } 391 #ifdef DIAGNOSTIC 392 if (drain && (nmp->nm_waiters > 0)) 393 panic("nfs_disconnect: waiters left after drain?"); 394 #endif 395 } 396 397 void 398 nfs_safedisconnect(nmp) 399 struct nfsmount *nmp; 400 { 401 struct nfsreq dummyreq; 402 403 memset(&dummyreq, 0, sizeof(dummyreq)); 404 dummyreq.r_nmp = nmp; 405 nfs_rcvlock(&dummyreq); /* XXX ignored error return */ 406 nfs_disconnect(nmp); 407 nfs_rcvunlock(nmp); 408 } 409 410 /* 411 * This is the nfs send routine. For connection based socket types, it 412 * must be called with an nfs_sndlock() on the socket. 413 * "rep == NULL" indicates that it has been called from a server. 414 * For the client side: 415 * - return EINTR if the RPC is terminated, 0 otherwise 416 * - set R_MUSTRESEND if the send fails for any reason 417 * - do any cleanup required by recoverable socket errors (? ? ?) 418 * For the server side: 419 * - return EINTR or ERESTART if interrupted by a signal 420 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 421 * - do any cleanup required by recoverable socket errors (? ? ?) 422 */ 423 int 424 nfs_send(so, nam, top, rep) 425 struct socket *so; 426 struct mbuf *nam; 427 struct mbuf *top; 428 struct nfsreq *rep; 429 { 430 struct mbuf *sendnam; 431 int error, soflags, flags; 432 433 if (rep) { 434 if (rep->r_flags & R_SOFTTERM) { 435 m_freem(top); 436 return (EINTR); 437 } 438 if ((so = rep->r_nmp->nm_so) == NULL) { 439 rep->r_flags |= R_MUSTRESEND; 440 m_freem(top); 441 return (0); 442 } 443 rep->r_flags &= ~R_MUSTRESEND; 444 soflags = rep->r_nmp->nm_soflags; 445 } else 446 soflags = so->so_proto->pr_flags; 447 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 448 sendnam = (struct mbuf *)0; 449 else 450 sendnam = nam; 451 if (so->so_type == SOCK_SEQPACKET) 452 flags = MSG_EOR; 453 else 454 flags = 0; 455 456 error = (*so->so_send)(so, sendnam, (struct uio *)0, top, 457 (struct mbuf *)0, flags); 458 if (error) { 459 if (rep) { 460 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 461 /* 462 * We're too fast for the network/driver, 463 * and UDP isn't flowcontrolled. 464 * We need to resend. This is not fatal, 465 * just try again. 466 * 467 * Could be smarter here by doing some sort 468 * of a backoff, but this is rare. 469 */ 470 rep->r_flags |= R_MUSTRESEND; 471 } else { 472 log(LOG_INFO, "nfs send error %d for %s\n", 473 error, 474 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 475 /* 476 * Deal with errors for the client side. 477 */ 478 if (rep->r_flags & R_SOFTTERM) 479 error = EINTR; 480 else 481 rep->r_flags |= R_MUSTRESEND; 482 } 483 } else { 484 /* 485 * See above. This error can happen under normal 486 * circumstances and the log is too noisy. 487 * The error will still show up in nfsstat. 488 */ 489 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 490 log(LOG_INFO, "nfsd send error %d\n", error); 491 } 492 493 /* 494 * Handle any recoverable (soft) socket errors here. (? ? ?) 495 */ 496 if (error != EINTR && error != ERESTART && 497 error != EWOULDBLOCK && error != EPIPE) 498 error = 0; 499 } 500 return (error); 501 } 502 503 #ifdef NFS 504 /* 505 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 506 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 507 * Mark and consolidate the data into a new mbuf list. 508 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 509 * small mbufs. 510 * For SOCK_STREAM we must be very careful to read an entire record once 511 * we have read any of it, even if the system call has been interrupted. 512 */ 513 int 514 nfs_receive(rep, aname, mp) 515 struct nfsreq *rep; 516 struct mbuf **aname; 517 struct mbuf **mp; 518 { 519 struct socket *so; 520 struct uio auio; 521 struct iovec aio; 522 struct mbuf *m; 523 struct mbuf *control; 524 u_int32_t len; 525 struct mbuf **getnam; 526 int error, sotype, rcvflg; 527 struct proc *p = curproc; /* XXX */ 528 529 /* 530 * Set up arguments for soreceive() 531 */ 532 *mp = (struct mbuf *)0; 533 *aname = (struct mbuf *)0; 534 sotype = rep->r_nmp->nm_sotype; 535 536 /* 537 * For reliable protocols, lock against other senders/receivers 538 * in case a reconnect is necessary. 539 * For SOCK_STREAM, first get the Record Mark to find out how much 540 * more there is to get. 541 * We must lock the socket against other receivers 542 * until we have an entire rpc request/reply. 543 */ 544 if (sotype != SOCK_DGRAM) { 545 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 546 if (error) 547 return (error); 548 tryagain: 549 /* 550 * Check for fatal errors and resending request. 551 */ 552 /* 553 * Ugh: If a reconnect attempt just happened, nm_so 554 * would have changed. NULL indicates a failed 555 * attempt that has essentially shut down this 556 * mount point. 557 */ 558 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 559 nfs_sndunlock(&rep->r_nmp->nm_iflag); 560 return (EINTR); 561 } 562 so = rep->r_nmp->nm_so; 563 if (!so) { 564 error = nfs_reconnect(rep); 565 if (error) { 566 nfs_sndunlock(&rep->r_nmp->nm_iflag); 567 return (error); 568 } 569 goto tryagain; 570 } 571 while (rep->r_flags & R_MUSTRESEND) { 572 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 573 nfsstats.rpcretries++; 574 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 575 if (error) { 576 if (error == EINTR || error == ERESTART || 577 (error = nfs_reconnect(rep)) != 0) { 578 nfs_sndunlock(&rep->r_nmp->nm_iflag); 579 return (error); 580 } 581 goto tryagain; 582 } 583 } 584 nfs_sndunlock(&rep->r_nmp->nm_iflag); 585 if (sotype == SOCK_STREAM) { 586 aio.iov_base = (caddr_t) &len; 587 aio.iov_len = sizeof(u_int32_t); 588 auio.uio_iov = &aio; 589 auio.uio_iovcnt = 1; 590 auio.uio_segflg = UIO_SYSSPACE; 591 auio.uio_rw = UIO_READ; 592 auio.uio_offset = 0; 593 auio.uio_resid = sizeof(u_int32_t); 594 auio.uio_procp = p; 595 do { 596 rcvflg = MSG_WAITALL; 597 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 598 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 599 if (error == EWOULDBLOCK && rep) { 600 if (rep->r_flags & R_SOFTTERM) 601 return (EINTR); 602 } 603 } while (error == EWOULDBLOCK); 604 if (!error && auio.uio_resid > 0) { 605 /* 606 * Don't log a 0 byte receive; it means 607 * that the socket has been closed, and 608 * can happen during normal operation 609 * (forcible unmount or Solaris server). 610 */ 611 if (auio.uio_resid != sizeof (u_int32_t)) 612 log(LOG_INFO, 613 "short receive (%lu/%lu) from nfs server %s\n", 614 (u_long)sizeof(u_int32_t) - auio.uio_resid, 615 (u_long)sizeof(u_int32_t), 616 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 617 error = EPIPE; 618 } 619 if (error) 620 goto errout; 621 len = ntohl(len) & ~0x80000000; 622 /* 623 * This is SERIOUS! We are out of sync with the sender 624 * and forcing a disconnect/reconnect is all I can do. 625 */ 626 if (len > NFS_MAXPACKET) { 627 log(LOG_ERR, "%s (%d) from nfs server %s\n", 628 "impossible packet length", 629 len, 630 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 631 error = EFBIG; 632 goto errout; 633 } 634 auio.uio_resid = len; 635 do { 636 rcvflg = MSG_WAITALL; 637 error = (*so->so_receive)(so, (struct mbuf **)0, 638 &auio, mp, (struct mbuf **)0, &rcvflg); 639 } while (error == EWOULDBLOCK || error == EINTR || 640 error == ERESTART); 641 if (!error && auio.uio_resid > 0) { 642 if (len != auio.uio_resid) 643 log(LOG_INFO, 644 "short receive (%lu/%d) from nfs server %s\n", 645 (u_long)len - auio.uio_resid, len, 646 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 647 error = EPIPE; 648 } 649 } else { 650 /* 651 * NB: Since uio_resid is big, MSG_WAITALL is ignored 652 * and soreceive() will return when it has either a 653 * control msg or a data msg. 654 * We have no use for control msg., but must grab them 655 * and then throw them away so we know what is going 656 * on. 657 */ 658 auio.uio_resid = len = 100000000; /* Anything Big */ 659 auio.uio_procp = p; 660 do { 661 rcvflg = 0; 662 error = (*so->so_receive)(so, (struct mbuf **)0, 663 &auio, mp, &control, &rcvflg); 664 if (control) 665 m_freem(control); 666 if (error == EWOULDBLOCK && rep) { 667 if (rep->r_flags & R_SOFTTERM) 668 return (EINTR); 669 } 670 } while (error == EWOULDBLOCK || 671 (!error && *mp == NULL && control)); 672 if ((rcvflg & MSG_EOR) == 0) 673 printf("Egad!!\n"); 674 if (!error && *mp == NULL) 675 error = EPIPE; 676 len -= auio.uio_resid; 677 } 678 errout: 679 if (error && error != EINTR && error != ERESTART) { 680 m_freem(*mp); 681 *mp = (struct mbuf *)0; 682 if (error != EPIPE) 683 log(LOG_INFO, 684 "receive error %d from nfs server %s\n", 685 error, 686 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 687 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 688 if (!error) 689 error = nfs_reconnect(rep); 690 if (!error) 691 goto tryagain; 692 else 693 nfs_sndunlock(&rep->r_nmp->nm_iflag); 694 } 695 } else { 696 if ((so = rep->r_nmp->nm_so) == NULL) 697 return (EACCES); 698 if (so->so_state & SS_ISCONNECTED) 699 getnam = (struct mbuf **)0; 700 else 701 getnam = aname; 702 auio.uio_resid = len = 1000000; 703 auio.uio_procp = p; 704 do { 705 rcvflg = 0; 706 error = (*so->so_receive)(so, getnam, &auio, mp, 707 (struct mbuf **)0, &rcvflg); 708 if (error == EWOULDBLOCK && 709 (rep->r_flags & R_SOFTTERM)) 710 return (EINTR); 711 } while (error == EWOULDBLOCK); 712 len -= auio.uio_resid; 713 if (!error && *mp == NULL) 714 error = EPIPE; 715 } 716 if (error) { 717 m_freem(*mp); 718 *mp = (struct mbuf *)0; 719 } 720 return (error); 721 } 722 723 /* 724 * Implement receipt of reply on a socket. 725 * We must search through the list of received datagrams matching them 726 * with outstanding requests using the xid, until ours is found. 727 */ 728 /* ARGSUSED */ 729 int 730 nfs_reply(myrep) 731 struct nfsreq *myrep; 732 { 733 struct nfsreq *rep; 734 struct nfsmount *nmp = myrep->r_nmp; 735 int32_t t1; 736 struct mbuf *mrep, *nam, *md; 737 u_int32_t rxid, *tl; 738 caddr_t dpos, cp2; 739 int error; 740 741 /* 742 * Loop around until we get our own reply 743 */ 744 for (;;) { 745 /* 746 * Lock against other receivers so that I don't get stuck in 747 * sbwait() after someone else has received my reply for me. 748 * Also necessary for connection based protocols to avoid 749 * race conditions during a reconnect. 750 */ 751 error = nfs_rcvlock(myrep); 752 if (error == EALREADY) 753 return (0); 754 if (error) 755 return (error); 756 /* 757 * Get the next Rpc reply off the socket 758 */ 759 nmp->nm_waiters++; 760 error = nfs_receive(myrep, &nam, &mrep); 761 nfs_rcvunlock(nmp); 762 if (error) { 763 764 if (nmp->nm_iflag & NFSMNT_DISMNT) { 765 /* 766 * Oops, we're going away now.. 767 */ 768 nmp->nm_waiters--; 769 wakeup (&nmp->nm_waiters); 770 return error; 771 } 772 nmp->nm_waiters--; 773 /* 774 * Ignore routing errors on connectionless protocols? ? 775 */ 776 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 777 nmp->nm_so->so_error = 0; 778 #ifdef DEBUG 779 printf("nfs_reply: ignoring error %d\n", error); 780 #endif 781 if (myrep->r_flags & R_GETONEREP) 782 return (0); 783 continue; 784 } 785 return (error); 786 } 787 nmp->nm_waiters--; 788 if (nam) 789 m_freem(nam); 790 791 /* 792 * Get the xid and check that it is an rpc reply 793 */ 794 md = mrep; 795 dpos = mtod(md, caddr_t); 796 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 797 rxid = *tl++; 798 if (*tl != rpc_reply) { 799 #ifndef NFS_V2_ONLY 800 if (nmp->nm_flag & NFSMNT_NQNFS) { 801 if (nqnfs_callback(nmp, mrep, md, dpos)) 802 nfsstats.rpcinvalid++; 803 } else 804 #endif 805 { 806 nfsstats.rpcinvalid++; 807 m_freem(mrep); 808 } 809 nfsmout: 810 if (myrep->r_flags & R_GETONEREP) 811 return (0); 812 continue; 813 } 814 815 /* 816 * Loop through the request list to match up the reply 817 * Iff no match, just drop the datagram 818 */ 819 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 820 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 821 /* Found it.. */ 822 rep->r_mrep = mrep; 823 rep->r_md = md; 824 rep->r_dpos = dpos; 825 if (nfsrtton) { 826 struct rttl *rt; 827 828 rt = &nfsrtt.rttl[nfsrtt.pos]; 829 rt->proc = rep->r_procnum; 830 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 831 rt->sent = nmp->nm_sent; 832 rt->cwnd = nmp->nm_cwnd; 833 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 834 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 835 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 836 rt->tstamp = time; 837 if (rep->r_flags & R_TIMING) 838 rt->rtt = rep->r_rtt; 839 else 840 rt->rtt = 1000000; 841 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 842 } 843 /* 844 * Update congestion window. 845 * Do the additive increase of 846 * one rpc/rtt. 847 */ 848 if (nmp->nm_cwnd <= nmp->nm_sent) { 849 nmp->nm_cwnd += 850 (NFS_CWNDSCALE * NFS_CWNDSCALE + 851 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 852 if (nmp->nm_cwnd > NFS_MAXCWND) 853 nmp->nm_cwnd = NFS_MAXCWND; 854 } 855 rep->r_flags &= ~R_SENT; 856 nmp->nm_sent -= NFS_CWNDSCALE; 857 /* 858 * Update rtt using a gain of 0.125 on the mean 859 * and a gain of 0.25 on the deviation. 860 */ 861 if (rep->r_flags & R_TIMING) { 862 /* 863 * Since the timer resolution of 864 * NFS_HZ is so course, it can often 865 * result in r_rtt == 0. Since 866 * r_rtt == N means that the actual 867 * rtt is between N+dt and N+2-dt ticks, 868 * add 1. 869 */ 870 t1 = rep->r_rtt + 1; 871 t1 -= (NFS_SRTT(rep) >> 3); 872 NFS_SRTT(rep) += t1; 873 if (t1 < 0) 874 t1 = -t1; 875 t1 -= (NFS_SDRTT(rep) >> 2); 876 NFS_SDRTT(rep) += t1; 877 } 878 nmp->nm_timeouts = 0; 879 break; 880 } 881 } 882 /* 883 * If not matched to a request, drop it. 884 * If it's mine, get out. 885 */ 886 if (rep == 0) { 887 nfsstats.rpcunexpected++; 888 m_freem(mrep); 889 } else if (rep == myrep) { 890 if (rep->r_mrep == NULL) 891 panic("nfsreply nil"); 892 return (0); 893 } 894 if (myrep->r_flags & R_GETONEREP) 895 return (0); 896 } 897 } 898 899 /* 900 * nfs_request - goes something like this 901 * - fill in request struct 902 * - links it into list 903 * - calls nfs_send() for first transmit 904 * - calls nfs_receive() to get reply 905 * - break down rpc header and return with nfs reply pointed to 906 * by mrep or error 907 * nb: always frees up mreq mbuf list 908 */ 909 int 910 nfs_request(np, mrest, procnum, procp, cred, mrp, mdp, dposp) 911 struct nfsnode *np; 912 struct mbuf *mrest; 913 int procnum; 914 struct proc *procp; 915 struct ucred *cred; 916 struct mbuf **mrp; 917 struct mbuf **mdp; 918 caddr_t *dposp; 919 { 920 struct mbuf *m, *mrep; 921 struct nfsreq *rep; 922 u_int32_t *tl; 923 int i; 924 struct nfsmount *nmp; 925 struct mbuf *md, *mheadend; 926 char nickv[RPCX_NICKVERF]; 927 time_t reqtime, waituntil; 928 caddr_t dpos, cp2; 929 int t1, s, error = 0, mrest_len, auth_len, auth_type; 930 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 931 int verf_len, verf_type; 932 u_int32_t xid; 933 char *auth_str, *verf_str; 934 NFSKERBKEY_T key; /* save session key */ 935 #ifndef NFS_V2_ONLY 936 int nqlflag, cachable; 937 u_quad_t frev; 938 #endif 939 940 KASSERT(cred != NULL); 941 nmp = VFSTONFS(np->n_vnode->v_mount); 942 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 943 rep->r_nmp = nmp; 944 rep->r_procp = procp; 945 rep->r_procnum = procnum; 946 i = 0; 947 m = mrest; 948 while (m) { 949 i += m->m_len; 950 m = m->m_next; 951 } 952 mrest_len = i; 953 954 /* 955 * Get the RPC header with authorization. 956 */ 957 kerbauth: 958 verf_str = auth_str = (char *)0; 959 if (nmp->nm_flag & NFSMNT_KERB) { 960 verf_str = nickv; 961 verf_len = sizeof (nickv); 962 auth_type = RPCAUTH_KERB4; 963 memset((caddr_t)key, 0, sizeof (key)); 964 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 965 &auth_len, verf_str, verf_len)) { 966 error = nfs_getauth(nmp, rep, cred, &auth_str, 967 &auth_len, verf_str, &verf_len, key); 968 if (error) { 969 free((caddr_t)rep, M_NFSREQ); 970 m_freem(mrest); 971 return (error); 972 } 973 } 974 } else { 975 auth_type = RPCAUTH_UNIX; 976 auth_len = (((cred->cr_ngroups > nmp->nm_numgrps) ? 977 nmp->nm_numgrps : cred->cr_ngroups) << 2) + 978 5 * NFSX_UNSIGNED; 979 } 980 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 981 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 982 if (auth_str) 983 free(auth_str, M_TEMP); 984 985 /* 986 * For stream protocols, insert a Sun RPC Record Mark. 987 */ 988 if (nmp->nm_sotype == SOCK_STREAM) { 989 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 990 *mtod(m, u_int32_t *) = htonl(0x80000000 | 991 (m->m_pkthdr.len - NFSX_UNSIGNED)); 992 } 993 rep->r_mreq = m; 994 rep->r_xid = xid; 995 tryagain: 996 if (nmp->nm_flag & NFSMNT_SOFT) 997 rep->r_retry = nmp->nm_retry; 998 else 999 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1000 rep->r_rtt = rep->r_rexmit = 0; 1001 if (proct[procnum] > 0) 1002 rep->r_flags = R_TIMING; 1003 else 1004 rep->r_flags = 0; 1005 rep->r_mrep = NULL; 1006 1007 /* 1008 * Do the client side RPC. 1009 */ 1010 nfsstats.rpcrequests++; 1011 /* 1012 * Chain request into list of outstanding requests. Be sure 1013 * to put it LAST so timer finds oldest requests first. 1014 */ 1015 s = splsoftnet(); 1016 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1017 1018 /* Get send time for nqnfs */ 1019 reqtime = time.tv_sec; 1020 1021 /* 1022 * If backing off another request or avoiding congestion, don't 1023 * send this one now but let timer do it. If not timing a request, 1024 * do it now. 1025 */ 1026 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1027 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1028 nmp->nm_sent < nmp->nm_cwnd)) { 1029 splx(s); 1030 if (nmp->nm_soflags & PR_CONNREQUIRED) 1031 error = nfs_sndlock(&nmp->nm_iflag, rep); 1032 if (!error) { 1033 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1034 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); 1035 if (nmp->nm_soflags & PR_CONNREQUIRED) 1036 nfs_sndunlock(&nmp->nm_iflag); 1037 } 1038 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1039 nmp->nm_sent += NFS_CWNDSCALE; 1040 rep->r_flags |= R_SENT; 1041 } 1042 } else { 1043 splx(s); 1044 rep->r_rtt = -1; 1045 } 1046 1047 /* 1048 * Wait for the reply from our send or the timer's. 1049 */ 1050 if (!error || error == EPIPE) 1051 error = nfs_reply(rep); 1052 1053 /* 1054 * RPC done, unlink the request. 1055 */ 1056 s = splsoftnet(); 1057 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1058 splx(s); 1059 1060 /* 1061 * Decrement the outstanding request count. 1062 */ 1063 if (rep->r_flags & R_SENT) { 1064 rep->r_flags &= ~R_SENT; /* paranoia */ 1065 nmp->nm_sent -= NFS_CWNDSCALE; 1066 } 1067 1068 /* 1069 * If there was a successful reply and a tprintf msg. 1070 * tprintf a response. 1071 */ 1072 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1073 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1074 "is alive again"); 1075 mrep = rep->r_mrep; 1076 md = rep->r_md; 1077 dpos = rep->r_dpos; 1078 if (error) { 1079 m_freem(rep->r_mreq); 1080 free((caddr_t)rep, M_NFSREQ); 1081 return (error); 1082 } 1083 1084 /* 1085 * break down the rpc header and check if ok 1086 */ 1087 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1088 if (*tl++ == rpc_msgdenied) { 1089 if (*tl == rpc_mismatch) 1090 error = EOPNOTSUPP; 1091 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1092 if (!failed_auth) { 1093 failed_auth++; 1094 mheadend->m_next = (struct mbuf *)0; 1095 m_freem(mrep); 1096 m_freem(rep->r_mreq); 1097 goto kerbauth; 1098 } else 1099 error = EAUTH; 1100 } else 1101 error = EACCES; 1102 m_freem(mrep); 1103 m_freem(rep->r_mreq); 1104 free((caddr_t)rep, M_NFSREQ); 1105 return (error); 1106 } 1107 1108 /* 1109 * Grab any Kerberos verifier, otherwise just throw it away. 1110 */ 1111 verf_type = fxdr_unsigned(int, *tl++); 1112 i = fxdr_unsigned(int32_t, *tl); 1113 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1114 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1115 if (error) 1116 goto nfsmout; 1117 } else if (i > 0) 1118 nfsm_adv(nfsm_rndup(i)); 1119 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1120 /* 0 == ok */ 1121 if (*tl == 0) { 1122 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1123 if (*tl != 0) { 1124 error = fxdr_unsigned(int, *tl); 1125 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1126 error == NFSERR_TRYLATER) { 1127 m_freem(mrep); 1128 error = 0; 1129 waituntil = time.tv_sec + trylater_delay; 1130 while (time.tv_sec < waituntil) 1131 (void) tsleep((caddr_t)&lbolt, 1132 PSOCK, "nqnfstry", 0); 1133 trylater_delay *= NFS_TRYLATERDELMUL; 1134 if (trylater_delay > NFS_TRYLATERDELMAX) 1135 trylater_delay = NFS_TRYLATERDELMAX; 1136 /* 1137 * RFC1813: 1138 * The client should wait and then try 1139 * the request with a new RPC transaction ID. 1140 */ 1141 nfs_renewxid(rep); 1142 goto tryagain; 1143 } 1144 1145 /* 1146 * If the File Handle was stale, invalidate the 1147 * lookup cache, just in case. 1148 */ 1149 if (error == ESTALE) 1150 cache_purge(NFSTOV(np)); 1151 if (nmp->nm_flag & NFSMNT_NFSV3) { 1152 *mrp = mrep; 1153 *mdp = md; 1154 *dposp = dpos; 1155 error |= NFSERR_RETERR; 1156 } else 1157 m_freem(mrep); 1158 m_freem(rep->r_mreq); 1159 free((caddr_t)rep, M_NFSREQ); 1160 return (error); 1161 } 1162 1163 #ifndef NFS_V2_ONLY 1164 /* 1165 * For nqnfs, get any lease in reply 1166 */ 1167 if (nmp->nm_flag & NFSMNT_NQNFS) { 1168 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1169 if (*tl) { 1170 nqlflag = fxdr_unsigned(int, *tl); 1171 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1172 cachable = fxdr_unsigned(int, *tl++); 1173 reqtime += fxdr_unsigned(int, *tl++); 1174 if (reqtime > time.tv_sec) { 1175 frev = fxdr_hyper(tl); 1176 nqnfs_clientlease(nmp, np, nqlflag, 1177 cachable, reqtime, frev); 1178 } 1179 } 1180 } 1181 #endif 1182 *mrp = mrep; 1183 *mdp = md; 1184 *dposp = dpos; 1185 m_freem(rep->r_mreq); 1186 FREE((caddr_t)rep, M_NFSREQ); 1187 return (0); 1188 } 1189 m_freem(mrep); 1190 error = EPROTONOSUPPORT; 1191 nfsmout: 1192 m_freem(rep->r_mreq); 1193 free((caddr_t)rep, M_NFSREQ); 1194 return (error); 1195 } 1196 #endif /* NFS */ 1197 1198 /* 1199 * Generate the rpc reply header 1200 * siz arg. is used to decide if adding a cluster is worthwhile 1201 */ 1202 int 1203 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1204 int siz; 1205 struct nfsrv_descript *nd; 1206 struct nfssvc_sock *slp; 1207 int err; 1208 int cache; 1209 u_quad_t *frev; 1210 struct mbuf **mrq; 1211 struct mbuf **mbp; 1212 caddr_t *bposp; 1213 { 1214 u_int32_t *tl; 1215 struct mbuf *mreq; 1216 caddr_t bpos; 1217 struct mbuf *mb; 1218 1219 mreq = m_gethdr(M_WAIT, MT_DATA); 1220 MCLAIM(mreq, &nfs_mowner); 1221 mb = mreq; 1222 /* 1223 * If this is a big reply, use a cluster else 1224 * try and leave leading space for the lower level headers. 1225 */ 1226 siz += RPC_REPLYSIZ; 1227 if (siz >= max_datalen) { 1228 m_clget(mreq, M_WAIT); 1229 } else 1230 mreq->m_data += max_hdr; 1231 tl = mtod(mreq, u_int32_t *); 1232 mreq->m_len = 6 * NFSX_UNSIGNED; 1233 bpos = ((caddr_t)tl) + mreq->m_len; 1234 *tl++ = txdr_unsigned(nd->nd_retxid); 1235 *tl++ = rpc_reply; 1236 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1237 *tl++ = rpc_msgdenied; 1238 if (err & NFSERR_AUTHERR) { 1239 *tl++ = rpc_autherr; 1240 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1241 mreq->m_len -= NFSX_UNSIGNED; 1242 bpos -= NFSX_UNSIGNED; 1243 } else { 1244 *tl++ = rpc_mismatch; 1245 *tl++ = txdr_unsigned(RPC_VER2); 1246 *tl = txdr_unsigned(RPC_VER2); 1247 } 1248 } else { 1249 *tl++ = rpc_msgaccepted; 1250 1251 /* 1252 * For Kerberos authentication, we must send the nickname 1253 * verifier back, otherwise just RPCAUTH_NULL. 1254 */ 1255 if (nd->nd_flag & ND_KERBFULL) { 1256 struct nfsuid *nuidp; 1257 struct timeval ktvin, ktvout; 1258 1259 LIST_FOREACH(nuidp, NUIDHASH(slp, nd->nd_cr.cr_uid), 1260 nu_hash) { 1261 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1262 (!nd->nd_nam2 || netaddr_match( 1263 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1264 nd->nd_nam2))) 1265 break; 1266 } 1267 if (nuidp) { 1268 ktvin.tv_sec = 1269 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1270 - 1); 1271 ktvin.tv_usec = 1272 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1273 1274 /* 1275 * Encrypt the timestamp in ecb mode using the 1276 * session key. 1277 */ 1278 #ifdef NFSKERB 1279 XXX 1280 #endif 1281 1282 *tl++ = rpc_auth_kerb; 1283 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1284 *tl = ktvout.tv_sec; 1285 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1286 *tl++ = ktvout.tv_usec; 1287 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1288 } else { 1289 *tl++ = 0; 1290 *tl++ = 0; 1291 } 1292 } else { 1293 *tl++ = 0; 1294 *tl++ = 0; 1295 } 1296 switch (err) { 1297 case EPROGUNAVAIL: 1298 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1299 break; 1300 case EPROGMISMATCH: 1301 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1302 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1303 if (nd->nd_flag & ND_NQNFS) { 1304 *tl++ = txdr_unsigned(3); 1305 *tl = txdr_unsigned(3); 1306 } else { 1307 *tl++ = txdr_unsigned(2); 1308 *tl = txdr_unsigned(3); 1309 } 1310 break; 1311 case EPROCUNAVAIL: 1312 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1313 break; 1314 case EBADRPC: 1315 *tl = txdr_unsigned(RPC_GARBAGE); 1316 break; 1317 default: 1318 *tl = 0; 1319 if (err != NFSERR_RETVOID) { 1320 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1321 if (err) 1322 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1323 else 1324 *tl = 0; 1325 } 1326 break; 1327 }; 1328 } 1329 1330 /* 1331 * For nqnfs, piggyback lease as requested. 1332 */ 1333 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1334 if (nd->nd_flag & ND_LEASE) { 1335 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1336 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1337 *tl++ = txdr_unsigned(cache); 1338 *tl++ = txdr_unsigned(nd->nd_duration); 1339 txdr_hyper(*frev, tl); 1340 } else { 1341 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1342 *tl = 0; 1343 } 1344 } 1345 if (mrq != NULL) 1346 *mrq = mreq; 1347 *mbp = mb; 1348 *bposp = bpos; 1349 if (err != 0 && err != NFSERR_RETVOID) 1350 nfsstats.srvrpc_errs++; 1351 return (0); 1352 } 1353 1354 /* 1355 * Nfs timer routine 1356 * Scan the nfsreq list and retranmit any requests that have timed out 1357 * To avoid retransmission attempts on STREAM sockets (in the future) make 1358 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1359 */ 1360 void 1361 nfs_timer(arg) 1362 void *arg; /* never used */ 1363 { 1364 struct nfsreq *rep; 1365 struct mbuf *m; 1366 struct socket *so; 1367 struct nfsmount *nmp; 1368 int timeo; 1369 int s, error; 1370 #ifdef NFSSERVER 1371 struct nfssvc_sock *slp; 1372 static long lasttime = 0; 1373 u_quad_t cur_usec; 1374 #endif 1375 1376 s = splsoftnet(); 1377 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1378 nmp = rep->r_nmp; 1379 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1380 continue; 1381 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1382 rep->r_flags |= R_SOFTTERM; 1383 continue; 1384 } 1385 if (rep->r_rtt >= 0) { 1386 rep->r_rtt++; 1387 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1388 timeo = nmp->nm_timeo; 1389 else 1390 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1391 if (nmp->nm_timeouts > 0) 1392 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1393 if (rep->r_rtt <= timeo) 1394 continue; 1395 if (nmp->nm_timeouts < 1396 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1397 nmp->nm_timeouts++; 1398 } 1399 /* 1400 * Check for server not responding 1401 */ 1402 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1403 rep->r_rexmit > nmp->nm_deadthresh) { 1404 nfs_msg(rep->r_procp, 1405 nmp->nm_mountp->mnt_stat.f_mntfromname, 1406 "not responding"); 1407 rep->r_flags |= R_TPRINTFMSG; 1408 } 1409 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1410 nfsstats.rpctimeouts++; 1411 rep->r_flags |= R_SOFTTERM; 1412 continue; 1413 } 1414 if (nmp->nm_sotype != SOCK_DGRAM) { 1415 if (++rep->r_rexmit > NFS_MAXREXMIT) 1416 rep->r_rexmit = NFS_MAXREXMIT; 1417 continue; 1418 } 1419 if ((so = nmp->nm_so) == NULL) 1420 continue; 1421 1422 /* 1423 * If there is enough space and the window allows.. 1424 * Resend it 1425 * Set r_rtt to -1 in case we fail to send it now. 1426 */ 1427 rep->r_rtt = -1; 1428 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1429 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1430 (rep->r_flags & R_SENT) || 1431 nmp->nm_sent < nmp->nm_cwnd) && 1432 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1433 if (so->so_state & SS_ISCONNECTED) 1434 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1435 (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); 1436 else 1437 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1438 nmp->nm_nam, (struct mbuf *)0, (struct proc *)0); 1439 if (error) { 1440 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1441 #ifdef DEBUG 1442 printf("nfs_timer: ignoring error %d\n", 1443 error); 1444 #endif 1445 so->so_error = 0; 1446 } 1447 } else { 1448 /* 1449 * Iff first send, start timing 1450 * else turn timing off, backoff timer 1451 * and divide congestion window by 2. 1452 */ 1453 if (rep->r_flags & R_SENT) { 1454 rep->r_flags &= ~R_TIMING; 1455 if (++rep->r_rexmit > NFS_MAXREXMIT) 1456 rep->r_rexmit = NFS_MAXREXMIT; 1457 nmp->nm_cwnd >>= 1; 1458 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1459 nmp->nm_cwnd = NFS_CWNDSCALE; 1460 nfsstats.rpcretries++; 1461 } else { 1462 rep->r_flags |= R_SENT; 1463 nmp->nm_sent += NFS_CWNDSCALE; 1464 } 1465 rep->r_rtt = 0; 1466 } 1467 } 1468 } 1469 1470 #ifdef NFSSERVER 1471 /* 1472 * Call the nqnfs server timer once a second to handle leases. 1473 */ 1474 if (lasttime != time.tv_sec) { 1475 lasttime = time.tv_sec; 1476 nqnfs_serverd(); 1477 } 1478 1479 /* 1480 * Scan the write gathering queues for writes that need to be 1481 * completed now. 1482 */ 1483 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec; 1484 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1485 if (LIST_FIRST(&slp->ns_tq) && 1486 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) 1487 nfsrv_wakenfsd(slp); 1488 } 1489 #endif /* NFSSERVER */ 1490 splx(s); 1491 callout_reset(&nfs_timer_ch, nfs_ticks, nfs_timer, NULL); 1492 } 1493 1494 /*ARGSUSED*/ 1495 void 1496 nfs_exit(p, v) 1497 struct proc *p; 1498 void *v; 1499 { 1500 struct nfsreq *rp; 1501 int s = splsoftnet(); 1502 1503 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 1504 if (rp->r_procp == p) 1505 TAILQ_REMOVE(&nfs_reqq, rp, r_chain); 1506 } 1507 splx(s); 1508 } 1509 1510 /* 1511 * Test for a termination condition pending on the process. 1512 * This is used for NFSMNT_INT mounts. 1513 */ 1514 int 1515 nfs_sigintr(nmp, rep, p) 1516 struct nfsmount *nmp; 1517 struct nfsreq *rep; 1518 struct proc *p; 1519 { 1520 sigset_t ss; 1521 1522 if (rep && (rep->r_flags & R_SOFTTERM)) 1523 return (EINTR); 1524 if (!(nmp->nm_flag & NFSMNT_INT)) 1525 return (0); 1526 if (p) { 1527 sigpending1(p, &ss); 1528 #if 0 1529 sigminusset(&p->p_sigctx.ps_sigignore, &ss); 1530 #endif 1531 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1532 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1533 sigismember(&ss, SIGQUIT)) 1534 return (EINTR); 1535 } 1536 return (0); 1537 } 1538 1539 /* 1540 * Lock a socket against others. 1541 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1542 * and also to avoid race conditions between the processes with nfs requests 1543 * in progress when a reconnect is necessary. 1544 */ 1545 int 1546 nfs_sndlock(flagp, rep) 1547 int *flagp; 1548 struct nfsreq *rep; 1549 { 1550 struct proc *p; 1551 int slpflag = 0, slptimeo = 0; 1552 1553 if (rep) { 1554 p = rep->r_procp; 1555 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1556 slpflag = PCATCH; 1557 } else 1558 p = (struct proc *)0; 1559 while (*flagp & NFSMNT_SNDLOCK) { 1560 if (nfs_sigintr(rep->r_nmp, rep, p)) 1561 return (EINTR); 1562 *flagp |= NFSMNT_WANTSND; 1563 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1564 slptimeo); 1565 if (slpflag == PCATCH) { 1566 slpflag = 0; 1567 slptimeo = 2 * hz; 1568 } 1569 } 1570 *flagp |= NFSMNT_SNDLOCK; 1571 return (0); 1572 } 1573 1574 /* 1575 * Unlock the stream socket for others. 1576 */ 1577 void 1578 nfs_sndunlock(flagp) 1579 int *flagp; 1580 { 1581 1582 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1583 panic("nfs sndunlock"); 1584 *flagp &= ~NFSMNT_SNDLOCK; 1585 if (*flagp & NFSMNT_WANTSND) { 1586 *flagp &= ~NFSMNT_WANTSND; 1587 wakeup((caddr_t)flagp); 1588 } 1589 } 1590 1591 int 1592 nfs_rcvlock(rep) 1593 struct nfsreq *rep; 1594 { 1595 struct nfsmount *nmp = rep->r_nmp; 1596 int *flagp = &nmp->nm_iflag; 1597 int slpflag, slptimeo = 0; 1598 int error = 0; 1599 1600 if (*flagp & NFSMNT_DISMNT) 1601 return EIO; 1602 1603 if (*flagp & NFSMNT_INT) 1604 slpflag = PCATCH; 1605 else 1606 slpflag = 0; 1607 simple_lock(&nmp->nm_slock); 1608 while (*flagp & NFSMNT_RCVLOCK) { 1609 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) { 1610 error = EINTR; 1611 goto quit; 1612 } 1613 *flagp |= NFSMNT_WANTRCV; 1614 nmp->nm_waiters++; 1615 (void) ltsleep(flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1616 slptimeo, &nmp->nm_slock); 1617 nmp->nm_waiters--; 1618 if (*flagp & NFSMNT_DISMNT) { 1619 wakeup(&nmp->nm_waiters); 1620 error = EIO; 1621 goto quit; 1622 } 1623 /* If our reply was received while we were sleeping, 1624 * then just return without taking the lock to avoid a 1625 * situation where a single iod could 'capture' the 1626 * receive lock. 1627 */ 1628 if (rep->r_mrep != NULL) { 1629 error = EALREADY; 1630 goto quit; 1631 } 1632 if (slpflag == PCATCH) { 1633 slpflag = 0; 1634 slptimeo = 2 * hz; 1635 } 1636 } 1637 *flagp |= NFSMNT_RCVLOCK; 1638 quit: 1639 simple_unlock(&nmp->nm_slock); 1640 return error; 1641 } 1642 1643 /* 1644 * Unlock the stream socket for others. 1645 */ 1646 void 1647 nfs_rcvunlock(nmp) 1648 struct nfsmount *nmp; 1649 { 1650 int *flagp = &nmp->nm_iflag; 1651 1652 simple_lock(&nmp->nm_slock); 1653 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1654 panic("nfs rcvunlock"); 1655 *flagp &= ~NFSMNT_RCVLOCK; 1656 if (*flagp & NFSMNT_WANTRCV) { 1657 *flagp &= ~NFSMNT_WANTRCV; 1658 wakeup((caddr_t)flagp); 1659 } 1660 simple_unlock(&nmp->nm_slock); 1661 } 1662 1663 /* 1664 * Parse an RPC request 1665 * - verify it 1666 * - fill in the cred struct. 1667 */ 1668 int 1669 nfs_getreq(nd, nfsd, has_header) 1670 struct nfsrv_descript *nd; 1671 struct nfsd *nfsd; 1672 int has_header; 1673 { 1674 int len, i; 1675 u_int32_t *tl; 1676 int32_t t1; 1677 struct uio uio; 1678 struct iovec iov; 1679 caddr_t dpos, cp2, cp; 1680 u_int32_t nfsvers, auth_type; 1681 uid_t nickuid; 1682 int error = 0, nqnfs = 0, ticklen; 1683 struct mbuf *mrep, *md; 1684 struct nfsuid *nuidp; 1685 struct timeval tvin, tvout; 1686 1687 mrep = nd->nd_mrep; 1688 md = nd->nd_md; 1689 dpos = nd->nd_dpos; 1690 if (has_header) { 1691 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1692 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1693 if (*tl++ != rpc_call) { 1694 m_freem(mrep); 1695 return (EBADRPC); 1696 } 1697 } else 1698 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1699 nd->nd_repstat = 0; 1700 nd->nd_flag = 0; 1701 if (*tl++ != rpc_vers) { 1702 nd->nd_repstat = ERPCMISMATCH; 1703 nd->nd_procnum = NFSPROC_NOOP; 1704 return (0); 1705 } 1706 if (*tl != nfs_prog) { 1707 if (*tl == nqnfs_prog) 1708 nqnfs++; 1709 else { 1710 nd->nd_repstat = EPROGUNAVAIL; 1711 nd->nd_procnum = NFSPROC_NOOP; 1712 return (0); 1713 } 1714 } 1715 tl++; 1716 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1717 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1718 (nfsvers != NQNFS_VER3 && nqnfs)) { 1719 nd->nd_repstat = EPROGMISMATCH; 1720 nd->nd_procnum = NFSPROC_NOOP; 1721 return (0); 1722 } 1723 if (nqnfs) 1724 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1725 else if (nfsvers == NFS_VER3) 1726 nd->nd_flag = ND_NFSV3; 1727 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1728 if (nd->nd_procnum == NFSPROC_NULL) 1729 return (0); 1730 if (nd->nd_procnum >= NFS_NPROCS || 1731 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1732 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1733 nd->nd_repstat = EPROCUNAVAIL; 1734 nd->nd_procnum = NFSPROC_NOOP; 1735 return (0); 1736 } 1737 if ((nd->nd_flag & ND_NFSV3) == 0) 1738 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1739 auth_type = *tl++; 1740 len = fxdr_unsigned(int, *tl++); 1741 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1742 m_freem(mrep); 1743 return (EBADRPC); 1744 } 1745 1746 nd->nd_flag &= ~ND_KERBAUTH; 1747 /* 1748 * Handle auth_unix or auth_kerb. 1749 */ 1750 if (auth_type == rpc_auth_unix) { 1751 len = fxdr_unsigned(int, *++tl); 1752 if (len < 0 || len > NFS_MAXNAMLEN) { 1753 m_freem(mrep); 1754 return (EBADRPC); 1755 } 1756 nfsm_adv(nfsm_rndup(len)); 1757 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1758 memset((caddr_t)&nd->nd_cr, 0, sizeof (struct ucred)); 1759 nd->nd_cr.cr_ref = 1; 1760 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1761 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1762 len = fxdr_unsigned(int, *tl); 1763 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1764 m_freem(mrep); 1765 return (EBADRPC); 1766 } 1767 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1768 for (i = 0; i < len; i++) 1769 if (i < NGROUPS) 1770 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1771 else 1772 tl++; 1773 nd->nd_cr.cr_ngroups = (len > NGROUPS) ? NGROUPS : len; 1774 if (nd->nd_cr.cr_ngroups > 1) 1775 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1776 len = fxdr_unsigned(int, *++tl); 1777 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1778 m_freem(mrep); 1779 return (EBADRPC); 1780 } 1781 if (len > 0) 1782 nfsm_adv(nfsm_rndup(len)); 1783 } else if (auth_type == rpc_auth_kerb) { 1784 switch (fxdr_unsigned(int, *tl++)) { 1785 case RPCAKN_FULLNAME: 1786 ticklen = fxdr_unsigned(int, *tl); 1787 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1788 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1789 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1790 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1791 m_freem(mrep); 1792 return (EBADRPC); 1793 } 1794 uio.uio_offset = 0; 1795 uio.uio_iov = &iov; 1796 uio.uio_iovcnt = 1; 1797 uio.uio_segflg = UIO_SYSSPACE; 1798 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1799 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1800 nfsm_mtouio(&uio, uio.uio_resid); 1801 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1802 if (*tl++ != rpc_auth_kerb || 1803 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1804 printf("Bad kerb verifier\n"); 1805 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1806 nd->nd_procnum = NFSPROC_NOOP; 1807 return (0); 1808 } 1809 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1810 tl = (u_int32_t *)cp; 1811 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1812 printf("Not fullname kerb verifier\n"); 1813 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1814 nd->nd_procnum = NFSPROC_NOOP; 1815 return (0); 1816 } 1817 cp += NFSX_UNSIGNED; 1818 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 1819 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1820 nd->nd_flag |= ND_KERBFULL; 1821 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1822 break; 1823 case RPCAKN_NICKNAME: 1824 if (len != 2 * NFSX_UNSIGNED) { 1825 printf("Kerb nickname short\n"); 1826 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1827 nd->nd_procnum = NFSPROC_NOOP; 1828 return (0); 1829 } 1830 nickuid = fxdr_unsigned(uid_t, *tl); 1831 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1832 if (*tl++ != rpc_auth_kerb || 1833 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1834 printf("Kerb nick verifier bad\n"); 1835 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1836 nd->nd_procnum = NFSPROC_NOOP; 1837 return (0); 1838 } 1839 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1840 tvin.tv_sec = *tl++; 1841 tvin.tv_usec = *tl; 1842 1843 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 1844 nu_hash) { 1845 if (nuidp->nu_cr.cr_uid == nickuid && 1846 (!nd->nd_nam2 || 1847 netaddr_match(NU_NETFAM(nuidp), 1848 &nuidp->nu_haddr, nd->nd_nam2))) 1849 break; 1850 } 1851 if (!nuidp) { 1852 nd->nd_repstat = 1853 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1854 nd->nd_procnum = NFSPROC_NOOP; 1855 return (0); 1856 } 1857 1858 /* 1859 * Now, decrypt the timestamp using the session key 1860 * and validate it. 1861 */ 1862 #ifdef NFSKERB 1863 XXX 1864 #endif 1865 1866 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1867 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1868 if (nuidp->nu_expire < time.tv_sec || 1869 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1870 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1871 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1872 nuidp->nu_expire = 0; 1873 nd->nd_repstat = 1874 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1875 nd->nd_procnum = NFSPROC_NOOP; 1876 return (0); 1877 } 1878 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1879 nd->nd_flag |= ND_KERBNICK; 1880 }; 1881 } else { 1882 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1883 nd->nd_procnum = NFSPROC_NOOP; 1884 return (0); 1885 } 1886 1887 /* 1888 * For nqnfs, get piggybacked lease request. 1889 */ 1890 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1891 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1892 nd->nd_flag |= fxdr_unsigned(int, *tl); 1893 if (nd->nd_flag & ND_LEASE) { 1894 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1895 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 1896 } else 1897 nd->nd_duration = NQ_MINLEASE; 1898 } else 1899 nd->nd_duration = NQ_MINLEASE; 1900 nd->nd_md = md; 1901 nd->nd_dpos = dpos; 1902 return (0); 1903 nfsmout: 1904 return (error); 1905 } 1906 1907 int 1908 nfs_msg(p, server, msg) 1909 struct proc *p; 1910 char *server, *msg; 1911 { 1912 tpr_t tpr; 1913 1914 if (p) 1915 tpr = tprintf_open(p); 1916 else 1917 tpr = NULL; 1918 tprintf(tpr, "nfs server %s: %s\n", server, msg); 1919 tprintf_close(tpr); 1920 return (0); 1921 } 1922 1923 #ifdef NFSSERVER 1924 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 1925 struct nfssvc_sock *, struct proc *, 1926 struct mbuf **)) = { 1927 nfsrv_null, 1928 nfsrv_getattr, 1929 nfsrv_setattr, 1930 nfsrv_lookup, 1931 nfsrv3_access, 1932 nfsrv_readlink, 1933 nfsrv_read, 1934 nfsrv_write, 1935 nfsrv_create, 1936 nfsrv_mkdir, 1937 nfsrv_symlink, 1938 nfsrv_mknod, 1939 nfsrv_remove, 1940 nfsrv_rmdir, 1941 nfsrv_rename, 1942 nfsrv_link, 1943 nfsrv_readdir, 1944 nfsrv_readdirplus, 1945 nfsrv_statfs, 1946 nfsrv_fsinfo, 1947 nfsrv_pathconf, 1948 nfsrv_commit, 1949 nqnfsrv_getlease, 1950 nqnfsrv_vacated, 1951 nfsrv_noop, 1952 nfsrv_noop 1953 }; 1954 1955 /* 1956 * Socket upcall routine for the nfsd sockets. 1957 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1958 * Essentially do as much as possible non-blocking, else punt and it will 1959 * be called with M_WAIT from an nfsd. 1960 */ 1961 void 1962 nfsrv_rcv(so, arg, waitflag) 1963 struct socket *so; 1964 caddr_t arg; 1965 int waitflag; 1966 { 1967 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1968 struct mbuf *m; 1969 struct mbuf *mp, *nam; 1970 struct uio auio; 1971 int flags, error; 1972 1973 if ((slp->ns_flag & SLP_VALID) == 0) 1974 return; 1975 #ifdef notdef 1976 /* 1977 * Define this to test for nfsds handling this under heavy load. 1978 */ 1979 if (waitflag == M_DONTWAIT) { 1980 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 1981 } 1982 #endif 1983 auio.uio_procp = NULL; 1984 if (so->so_type == SOCK_STREAM) { 1985 /* 1986 * If there are already records on the queue, defer soreceive() 1987 * to an nfsd so that there is feedback to the TCP layer that 1988 * the nfs servers are heavily loaded. 1989 */ 1990 if (slp->ns_rec && waitflag == M_DONTWAIT) { 1991 slp->ns_flag |= SLP_NEEDQ; 1992 goto dorecs; 1993 } 1994 1995 /* 1996 * Do soreceive(). 1997 */ 1998 auio.uio_resid = 1000000000; 1999 flags = MSG_DONTWAIT; 2000 error = (*so->so_receive)(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 2001 if (error || mp == (struct mbuf *)0) { 2002 if (error == EWOULDBLOCK) 2003 slp->ns_flag |= SLP_NEEDQ; 2004 else 2005 slp->ns_flag |= SLP_DISCONN; 2006 goto dorecs; 2007 } 2008 m = mp; 2009 if (slp->ns_rawend) { 2010 slp->ns_rawend->m_next = m; 2011 slp->ns_cc += 1000000000 - auio.uio_resid; 2012 } else { 2013 slp->ns_raw = m; 2014 slp->ns_cc = 1000000000 - auio.uio_resid; 2015 } 2016 while (m->m_next) 2017 m = m->m_next; 2018 slp->ns_rawend = m; 2019 2020 /* 2021 * Now try and parse record(s) out of the raw stream data. 2022 */ 2023 error = nfsrv_getstream(slp, waitflag); 2024 if (error) { 2025 if (error == EPERM) 2026 slp->ns_flag |= SLP_DISCONN; 2027 else 2028 slp->ns_flag |= SLP_NEEDQ; 2029 } 2030 } else { 2031 do { 2032 auio.uio_resid = 1000000000; 2033 flags = MSG_DONTWAIT; 2034 error = (*so->so_receive)(so, &nam, &auio, &mp, 2035 (struct mbuf **)0, &flags); 2036 if (mp) { 2037 if (nam) { 2038 m = nam; 2039 m->m_next = mp; 2040 } else 2041 m = mp; 2042 if (slp->ns_recend) 2043 slp->ns_recend->m_nextpkt = m; 2044 else 2045 slp->ns_rec = m; 2046 slp->ns_recend = m; 2047 m->m_nextpkt = (struct mbuf *)0; 2048 } 2049 if (error) { 2050 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2051 && error != EWOULDBLOCK) { 2052 slp->ns_flag |= SLP_DISCONN; 2053 goto dorecs; 2054 } 2055 } 2056 } while (mp); 2057 } 2058 2059 /* 2060 * Now try and process the request records, non-blocking. 2061 */ 2062 dorecs: 2063 if (waitflag == M_DONTWAIT && 2064 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2065 nfsrv_wakenfsd(slp); 2066 } 2067 2068 /* 2069 * Try and extract an RPC request from the mbuf data list received on a 2070 * stream socket. The "waitflag" argument indicates whether or not it 2071 * can sleep. 2072 */ 2073 int 2074 nfsrv_getstream(slp, waitflag) 2075 struct nfssvc_sock *slp; 2076 int waitflag; 2077 { 2078 struct mbuf *m, **mpp; 2079 struct mbuf *recm; 2080 u_int32_t recmark; 2081 2082 if (slp->ns_flag & SLP_GETSTREAM) 2083 panic("nfs getstream"); 2084 slp->ns_flag |= SLP_GETSTREAM; 2085 for (;;) { 2086 if (slp->ns_reclen == 0) { 2087 if (slp->ns_cc < NFSX_UNSIGNED) { 2088 slp->ns_flag &= ~SLP_GETSTREAM; 2089 return (0); 2090 } 2091 m = slp->ns_raw; 2092 m_copydata(m, 0, NFSX_UNSIGNED, (caddr_t)&recmark); 2093 m_adj(m, NFSX_UNSIGNED); 2094 slp->ns_cc -= NFSX_UNSIGNED; 2095 recmark = ntohl(recmark); 2096 slp->ns_reclen = recmark & ~0x80000000; 2097 if (recmark & 0x80000000) 2098 slp->ns_flag |= SLP_LASTFRAG; 2099 else 2100 slp->ns_flag &= ~SLP_LASTFRAG; 2101 if (slp->ns_reclen > NFS_MAXPACKET) { 2102 slp->ns_flag &= ~SLP_GETSTREAM; 2103 return (EPERM); 2104 } 2105 } 2106 2107 /* 2108 * Now get the record part. 2109 * 2110 * Note that slp->ns_reclen may be 0. Linux sometimes 2111 * generates 0-length records. 2112 */ 2113 if (slp->ns_cc == slp->ns_reclen) { 2114 recm = slp->ns_raw; 2115 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2116 slp->ns_cc = slp->ns_reclen = 0; 2117 } else if (slp->ns_cc > slp->ns_reclen) { 2118 recm = slp->ns_raw; 2119 m = m_split(recm, slp->ns_reclen, waitflag); 2120 if (m == NULL) { 2121 slp->ns_flag &= ~SLP_GETSTREAM; 2122 return (EWOULDBLOCK); 2123 } 2124 m_claim(recm, &nfs_mowner); 2125 slp->ns_raw = m; 2126 if (m->m_next == NULL) 2127 slp->ns_rawend = m; 2128 slp->ns_cc -= slp->ns_reclen; 2129 slp->ns_reclen = 0; 2130 } else { 2131 slp->ns_flag &= ~SLP_GETSTREAM; 2132 return (0); 2133 } 2134 2135 /* 2136 * Accumulate the fragments into a record. 2137 */ 2138 mpp = &slp->ns_frag; 2139 while (*mpp) 2140 mpp = &((*mpp)->m_next); 2141 *mpp = recm; 2142 if (slp->ns_flag & SLP_LASTFRAG) { 2143 if (slp->ns_recend) 2144 slp->ns_recend->m_nextpkt = slp->ns_frag; 2145 else 2146 slp->ns_rec = slp->ns_frag; 2147 slp->ns_recend = slp->ns_frag; 2148 slp->ns_frag = (struct mbuf *)0; 2149 } 2150 } 2151 } 2152 2153 /* 2154 * Parse an RPC header. 2155 */ 2156 int 2157 nfsrv_dorec(slp, nfsd, ndp) 2158 struct nfssvc_sock *slp; 2159 struct nfsd *nfsd; 2160 struct nfsrv_descript **ndp; 2161 { 2162 struct mbuf *m, *nam; 2163 struct nfsrv_descript *nd; 2164 int error; 2165 2166 *ndp = NULL; 2167 if ((slp->ns_flag & SLP_VALID) == 0 || 2168 (m = slp->ns_rec) == (struct mbuf *)0) 2169 return (ENOBUFS); 2170 slp->ns_rec = m->m_nextpkt; 2171 if (slp->ns_rec) 2172 m->m_nextpkt = (struct mbuf *)0; 2173 else 2174 slp->ns_recend = (struct mbuf *)0; 2175 if (m->m_type == MT_SONAME) { 2176 nam = m; 2177 m = m->m_next; 2178 nam->m_next = NULL; 2179 } else 2180 nam = NULL; 2181 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2182 nd->nd_md = nd->nd_mrep = m; 2183 nd->nd_nam2 = nam; 2184 nd->nd_dpos = mtod(m, caddr_t); 2185 error = nfs_getreq(nd, nfsd, TRUE); 2186 if (error) { 2187 m_freem(nam); 2188 pool_put(&nfs_srvdesc_pool, nd); 2189 return (error); 2190 } 2191 *ndp = nd; 2192 nfsd->nfsd_nd = nd; 2193 return (0); 2194 } 2195 2196 2197 /* 2198 * Search for a sleeping nfsd and wake it up. 2199 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2200 * running nfsds will go look for the work in the nfssvc_sock list. 2201 */ 2202 void 2203 nfsrv_wakenfsd(slp) 2204 struct nfssvc_sock *slp; 2205 { 2206 struct nfsd *nd; 2207 2208 if ((slp->ns_flag & SLP_VALID) == 0) 2209 return; 2210 simple_lock(&nfsd_slock); 2211 if (slp->ns_flag & SLP_DOREC) { 2212 simple_unlock(&nfsd_slock); 2213 return; 2214 } 2215 nd = SLIST_FIRST(&nfsd_idle_head); 2216 if (nd) { 2217 SLIST_REMOVE_HEAD(&nfsd_idle_head, nfsd_idle); 2218 simple_unlock(&nfsd_slock); 2219 2220 KASSERT(nd->nfsd_flag & NFSD_WAITING); 2221 nd->nfsd_flag &= ~NFSD_WAITING; 2222 if (nd->nfsd_slp) 2223 panic("nfsd wakeup"); 2224 slp->ns_sref++; 2225 nd->nfsd_slp = slp; 2226 wakeup(nd); 2227 return; 2228 } 2229 slp->ns_flag |= SLP_DOREC; 2230 nfsd_head_flag |= NFSD_CHECKSLP; 2231 TAILQ_INSERT_TAIL(&nfssvc_sockpending, slp, ns_pending); 2232 simple_unlock(&nfsd_slock); 2233 } 2234 #endif /* NFSSERVER */ 2235