1 /* $NetBSD: nfs_socket.c,v 1.72 2002/02/27 03:46:36 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 39 */ 40 41 /* 42 * Socket operations for use by nfs 43 */ 44 45 #include <sys/cdefs.h> 46 __KERNEL_RCSID(0, "$NetBSD: nfs_socket.c,v 1.72 2002/02/27 03:46:36 lukem Exp $"); 47 48 #include "fs_nfs.h" 49 #include "opt_nfs.h" 50 #include "opt_nfsserver.h" 51 #include "opt_inet.h" 52 53 #include <sys/param.h> 54 #include <sys/systm.h> 55 #include <sys/callout.h> 56 #include <sys/proc.h> 57 #include <sys/mount.h> 58 #include <sys/kernel.h> 59 #include <sys/mbuf.h> 60 #include <sys/vnode.h> 61 #include <sys/domain.h> 62 #include <sys/protosw.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/syslog.h> 66 #include <sys/tprintf.h> 67 #include <sys/namei.h> 68 #include <sys/signal.h> 69 #include <sys/signalvar.h> 70 71 #include <netinet/in.h> 72 #include <netinet/tcp.h> 73 74 #include <nfs/rpcv2.h> 75 #include <nfs/nfsproto.h> 76 #include <nfs/nfs.h> 77 #include <nfs/xdr_subs.h> 78 #include <nfs/nfsm_subs.h> 79 #include <nfs/nfsmount.h> 80 #include <nfs/nfsnode.h> 81 #include <nfs/nfsrtt.h> 82 #include <nfs/nqnfs.h> 83 #include <nfs/nfs_var.h> 84 85 #define TRUE 1 86 #define FALSE 0 87 88 /* 89 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 90 * Use the mean and mean deviation of rtt for the appropriate type of rpc 91 * for the frequent rpcs and a default for the others. 92 * The justification for doing "other" this way is that these rpcs 93 * happen so infrequently that timer est. would probably be stale. 94 * Also, since many of these rpcs are 95 * non-idempotent, a conservative timeout is desired. 96 * getattr, lookup - A+2D 97 * read, write - A+4D 98 * other - nm_timeo 99 */ 100 #define NFS_RTO(n, t) \ 101 ((t) == 0 ? (n)->nm_timeo : \ 102 ((t) < 3 ? \ 103 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 104 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 105 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 106 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 107 /* 108 * External data, mostly RPC constants in XDR form 109 */ 110 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 111 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 112 rpc_auth_kerb; 113 extern u_int32_t nfs_prog, nqnfs_prog; 114 extern time_t nqnfsstarttime; 115 extern struct nfsstats nfsstats; 116 extern int nfsv3_procid[NFS_NPROCS]; 117 extern int nfs_ticks; 118 119 /* 120 * Defines which timer to use for the procnum. 121 * 0 - default 122 * 1 - getattr 123 * 2 - lookup 124 * 3 - read 125 * 4 - write 126 */ 127 static const int proct[NFS_NPROCS] = { 128 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 129 0, 0, 0, 130 }; 131 132 /* 133 * There is a congestion window for outstanding rpcs maintained per mount 134 * point. The cwnd size is adjusted in roughly the way that: 135 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 136 * SIGCOMM '88". ACM, August 1988. 137 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 138 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 139 * of rpcs is in progress. 140 * (The sent count and cwnd are scaled for integer arith.) 141 * Variants of "slow start" were tried and were found to be too much of a 142 * performance hit (ave. rtt 3 times larger), 143 * I suspect due to the large rtt that nfs rpcs have. 144 */ 145 #define NFS_CWNDSCALE 256 146 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 147 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 148 int nfsrtton = 0; 149 struct nfsrtt nfsrtt; 150 151 struct callout nfs_timer_ch = CALLOUT_INITIALIZER; 152 153 /* 154 * Initialize sockets and congestion for a new NFS connection. 155 * We do not free the sockaddr if error. 156 */ 157 int 158 nfs_connect(nmp, rep) 159 struct nfsmount *nmp; 160 struct nfsreq *rep; 161 { 162 struct socket *so; 163 int s, error, rcvreserve, sndreserve; 164 struct sockaddr *saddr; 165 struct sockaddr_in *sin; 166 #ifdef INET6 167 struct sockaddr_in6 *sin6; 168 #endif 169 struct mbuf *m; 170 171 nmp->nm_so = (struct socket *)0; 172 saddr = mtod(nmp->nm_nam, struct sockaddr *); 173 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 174 nmp->nm_soproto); 175 if (error) 176 goto bad; 177 so = nmp->nm_so; 178 nmp->nm_soflags = so->so_proto->pr_flags; 179 180 /* 181 * Some servers require that the client port be a reserved port number. 182 */ 183 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 184 MGET(m, M_WAIT, MT_SOOPTS); 185 *mtod(m, int32_t *) = IP_PORTRANGE_LOW; 186 m->m_len = sizeof(int32_t); 187 if ((error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, m))) 188 goto bad; 189 MGET(m, M_WAIT, MT_SONAME); 190 sin = mtod(m, struct sockaddr_in *); 191 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 192 sin->sin_family = AF_INET; 193 sin->sin_addr.s_addr = INADDR_ANY; 194 sin->sin_port = 0; 195 error = sobind(so, m, &proc0); 196 m_freem(m); 197 if (error) 198 goto bad; 199 } 200 #ifdef INET6 201 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 202 MGET(m, M_WAIT, MT_SOOPTS); 203 *mtod(m, int32_t *) = IPV6_PORTRANGE_LOW; 204 m->m_len = sizeof(int32_t); 205 if ((error = sosetopt(so, IPPROTO_IPV6, IPV6_PORTRANGE, m))) 206 goto bad; 207 MGET(m, M_WAIT, MT_SONAME); 208 sin6 = mtod(m, struct sockaddr_in6 *); 209 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 210 sin6->sin6_family = AF_INET6; 211 sin6->sin6_addr = in6addr_any; 212 sin6->sin6_port = 0; 213 error = sobind(so, m, &proc0); 214 m_freem(m); 215 if (error) 216 goto bad; 217 } 218 #endif 219 220 /* 221 * Protocols that do not require connections may be optionally left 222 * unconnected for servers that reply from a port other than NFS_PORT. 223 */ 224 if (nmp->nm_flag & NFSMNT_NOCONN) { 225 if (nmp->nm_soflags & PR_CONNREQUIRED) { 226 error = ENOTCONN; 227 goto bad; 228 } 229 } else { 230 error = soconnect(so, nmp->nm_nam); 231 if (error) 232 goto bad; 233 234 /* 235 * Wait for the connection to complete. Cribbed from the 236 * connect system call but with the wait timing out so 237 * that interruptible mounts don't hang here for a long time. 238 */ 239 s = splsoftnet(); 240 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 241 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 242 "nfscn1", 2 * hz); 243 if ((so->so_state & SS_ISCONNECTING) && 244 so->so_error == 0 && rep && 245 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 246 so->so_state &= ~SS_ISCONNECTING; 247 splx(s); 248 goto bad; 249 } 250 } 251 if (so->so_error) { 252 error = so->so_error; 253 so->so_error = 0; 254 splx(s); 255 goto bad; 256 } 257 splx(s); 258 } 259 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 260 so->so_rcv.sb_timeo = (5 * hz); 261 so->so_snd.sb_timeo = (5 * hz); 262 } else { 263 so->so_rcv.sb_timeo = 0; 264 so->so_snd.sb_timeo = 0; 265 } 266 if (nmp->nm_sotype == SOCK_DGRAM) { 267 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 268 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 269 NFS_MAXPKTHDR) * 2; 270 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 271 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 272 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 273 NFS_MAXPKTHDR) * 2; 274 } else { 275 if (nmp->nm_sotype != SOCK_STREAM) 276 panic("nfscon sotype"); 277 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 278 MGET(m, M_WAIT, MT_SOOPTS); 279 *mtod(m, int32_t *) = 1; 280 m->m_len = sizeof(int32_t); 281 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 282 } 283 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 284 MGET(m, M_WAIT, MT_SOOPTS); 285 *mtod(m, int32_t *) = 1; 286 m->m_len = sizeof(int32_t); 287 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 288 } 289 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 290 sizeof (u_int32_t)) * 2; 291 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 292 sizeof (u_int32_t)) * 2; 293 } 294 error = soreserve(so, sndreserve, rcvreserve); 295 if (error) 296 goto bad; 297 so->so_rcv.sb_flags |= SB_NOINTR; 298 so->so_snd.sb_flags |= SB_NOINTR; 299 300 /* Initialize other non-zero congestion variables */ 301 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 302 NFS_TIMEO << 3; 303 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 304 nmp->nm_sdrtt[3] = 0; 305 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 306 nmp->nm_sent = 0; 307 nmp->nm_timeouts = 0; 308 return (0); 309 310 bad: 311 nfs_disconnect(nmp); 312 return (error); 313 } 314 315 /* 316 * Reconnect routine: 317 * Called when a connection is broken on a reliable protocol. 318 * - clean up the old socket 319 * - nfs_connect() again 320 * - set R_MUSTRESEND for all outstanding requests on mount point 321 * If this fails the mount point is DEAD! 322 * nb: Must be called with the nfs_sndlock() set on the mount point. 323 */ 324 int 325 nfs_reconnect(rep) 326 struct nfsreq *rep; 327 { 328 struct nfsreq *rp; 329 struct nfsmount *nmp = rep->r_nmp; 330 int error; 331 332 nfs_disconnect(nmp); 333 while ((error = nfs_connect(nmp, rep)) != 0) { 334 if (error == EINTR || error == ERESTART) 335 return (EINTR); 336 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscn2", 0); 337 } 338 339 /* 340 * Loop through outstanding request list and fix up all requests 341 * on old socket. 342 */ 343 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) { 344 if (rp->r_nmp == nmp) 345 rp->r_flags |= R_MUSTRESEND; 346 } 347 return (0); 348 } 349 350 /* 351 * NFS disconnect. Clean up and unlink. 352 */ 353 void 354 nfs_disconnect(nmp) 355 struct nfsmount *nmp; 356 { 357 struct socket *so; 358 int drain = 0; 359 360 if (nmp->nm_so) { 361 so = nmp->nm_so; 362 nmp->nm_so = (struct socket *)0; 363 soshutdown(so, 2); 364 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 365 if (drain) { 366 /* 367 * soshutdown() above should wake up the current 368 * listener. 369 * Now wake up those waiting for the receive lock, and 370 * wait for them to go away unhappy, to prevent *nmp 371 * from evaporating while they're sleeping. 372 */ 373 while (nmp->nm_waiters > 0) { 374 wakeup (&nmp->nm_iflag); 375 (void) tsleep(&nmp->nm_waiters, PVFS, 376 "nfsdis", 0); 377 } 378 } 379 soclose(so); 380 } 381 #ifdef DIAGNOSTIC 382 if (drain && (nmp->nm_waiters > 0)) 383 panic("nfs_disconnect: waiters left after drain?\n"); 384 #endif 385 } 386 387 void 388 nfs_safedisconnect(nmp) 389 struct nfsmount *nmp; 390 { 391 struct nfsreq dummyreq; 392 393 memset(&dummyreq, 0, sizeof(dummyreq)); 394 dummyreq.r_nmp = nmp; 395 nfs_rcvlock(&dummyreq); /* XXX ignored error return */ 396 nfs_disconnect(nmp); 397 nfs_rcvunlock(&nmp->nm_iflag); 398 } 399 400 /* 401 * This is the nfs send routine. For connection based socket types, it 402 * must be called with an nfs_sndlock() on the socket. 403 * "rep == NULL" indicates that it has been called from a server. 404 * For the client side: 405 * - return EINTR if the RPC is terminated, 0 otherwise 406 * - set R_MUSTRESEND if the send fails for any reason 407 * - do any cleanup required by recoverable socket errors (? ? ?) 408 * For the server side: 409 * - return EINTR or ERESTART if interrupted by a signal 410 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 411 * - do any cleanup required by recoverable socket errors (? ? ?) 412 */ 413 int 414 nfs_send(so, nam, top, rep) 415 struct socket *so; 416 struct mbuf *nam; 417 struct mbuf *top; 418 struct nfsreq *rep; 419 { 420 struct mbuf *sendnam; 421 int error, soflags, flags; 422 423 if (rep) { 424 if (rep->r_flags & R_SOFTTERM) { 425 m_freem(top); 426 return (EINTR); 427 } 428 if ((so = rep->r_nmp->nm_so) == NULL) { 429 rep->r_flags |= R_MUSTRESEND; 430 m_freem(top); 431 return (0); 432 } 433 rep->r_flags &= ~R_MUSTRESEND; 434 soflags = rep->r_nmp->nm_soflags; 435 } else 436 soflags = so->so_proto->pr_flags; 437 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 438 sendnam = (struct mbuf *)0; 439 else 440 sendnam = nam; 441 if (so->so_type == SOCK_SEQPACKET) 442 flags = MSG_EOR; 443 else 444 flags = 0; 445 446 error = (*so->so_send)(so, sendnam, (struct uio *)0, top, 447 (struct mbuf *)0, flags); 448 if (error) { 449 if (rep) { 450 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 451 /* 452 * We're too fast for the network/driver, 453 * and UDP isn't flowcontrolled. 454 * We need to resend. This is not fatal, 455 * just try again. 456 * 457 * Could be smarter here by doing some sort 458 * of a backoff, but this is rare. 459 */ 460 rep->r_flags |= R_MUSTRESEND; 461 } else { 462 log(LOG_INFO, "nfs send error %d for %s\n", 463 error, 464 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 465 /* 466 * Deal with errors for the client side. 467 */ 468 if (rep->r_flags & R_SOFTTERM) 469 error = EINTR; 470 else 471 rep->r_flags |= R_MUSTRESEND; 472 } 473 } else { 474 /* 475 * See above. This error can happen under normal 476 * circumstances and the log is too noisy. 477 * The error will still show up in nfsstat. 478 */ 479 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 480 log(LOG_INFO, "nfsd send error %d\n", error); 481 } 482 483 /* 484 * Handle any recoverable (soft) socket errors here. (? ? ?) 485 */ 486 if (error != EINTR && error != ERESTART && 487 error != EWOULDBLOCK && error != EPIPE) 488 error = 0; 489 } 490 return (error); 491 } 492 493 #ifdef NFS 494 /* 495 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 496 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 497 * Mark and consolidate the data into a new mbuf list. 498 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 499 * small mbufs. 500 * For SOCK_STREAM we must be very careful to read an entire record once 501 * we have read any of it, even if the system call has been interrupted. 502 */ 503 int 504 nfs_receive(rep, aname, mp) 505 struct nfsreq *rep; 506 struct mbuf **aname; 507 struct mbuf **mp; 508 { 509 struct socket *so; 510 struct uio auio; 511 struct iovec aio; 512 struct mbuf *m; 513 struct mbuf *control; 514 u_int32_t len; 515 struct mbuf **getnam; 516 int error, sotype, rcvflg; 517 struct proc *p = curproc; /* XXX */ 518 519 /* 520 * Set up arguments for soreceive() 521 */ 522 *mp = (struct mbuf *)0; 523 *aname = (struct mbuf *)0; 524 sotype = rep->r_nmp->nm_sotype; 525 526 /* 527 * For reliable protocols, lock against other senders/receivers 528 * in case a reconnect is necessary. 529 * For SOCK_STREAM, first get the Record Mark to find out how much 530 * more there is to get. 531 * We must lock the socket against other receivers 532 * until we have an entire rpc request/reply. 533 */ 534 if (sotype != SOCK_DGRAM) { 535 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 536 if (error) 537 return (error); 538 tryagain: 539 /* 540 * Check for fatal errors and resending request. 541 */ 542 /* 543 * Ugh: If a reconnect attempt just happened, nm_so 544 * would have changed. NULL indicates a failed 545 * attempt that has essentially shut down this 546 * mount point. 547 */ 548 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 549 nfs_sndunlock(&rep->r_nmp->nm_iflag); 550 return (EINTR); 551 } 552 so = rep->r_nmp->nm_so; 553 if (!so) { 554 error = nfs_reconnect(rep); 555 if (error) { 556 nfs_sndunlock(&rep->r_nmp->nm_iflag); 557 return (error); 558 } 559 goto tryagain; 560 } 561 while (rep->r_flags & R_MUSTRESEND) { 562 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 563 nfsstats.rpcretries++; 564 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 565 if (error) { 566 if (error == EINTR || error == ERESTART || 567 (error = nfs_reconnect(rep)) != 0) { 568 nfs_sndunlock(&rep->r_nmp->nm_iflag); 569 return (error); 570 } 571 goto tryagain; 572 } 573 } 574 nfs_sndunlock(&rep->r_nmp->nm_iflag); 575 if (sotype == SOCK_STREAM) { 576 aio.iov_base = (caddr_t) &len; 577 aio.iov_len = sizeof(u_int32_t); 578 auio.uio_iov = &aio; 579 auio.uio_iovcnt = 1; 580 auio.uio_segflg = UIO_SYSSPACE; 581 auio.uio_rw = UIO_READ; 582 auio.uio_offset = 0; 583 auio.uio_resid = sizeof(u_int32_t); 584 auio.uio_procp = p; 585 do { 586 rcvflg = MSG_WAITALL; 587 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 588 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 589 if (error == EWOULDBLOCK && rep) { 590 if (rep->r_flags & R_SOFTTERM) 591 return (EINTR); 592 } 593 } while (error == EWOULDBLOCK); 594 if (!error && auio.uio_resid > 0) { 595 /* 596 * Don't log a 0 byte receive; it means 597 * that the socket has been closed, and 598 * can happen during normal operation 599 * (forcible unmount or Solaris server). 600 */ 601 if (auio.uio_resid != sizeof (u_int32_t)) 602 log(LOG_INFO, 603 "short receive (%lu/%lu) from nfs server %s\n", 604 (u_long)sizeof(u_int32_t) - auio.uio_resid, 605 (u_long)sizeof(u_int32_t), 606 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 607 error = EPIPE; 608 } 609 if (error) 610 goto errout; 611 len = ntohl(len) & ~0x80000000; 612 /* 613 * This is SERIOUS! We are out of sync with the sender 614 * and forcing a disconnect/reconnect is all I can do. 615 */ 616 if (len > NFS_MAXPACKET) { 617 log(LOG_ERR, "%s (%d) from nfs server %s\n", 618 "impossible packet length", 619 len, 620 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 621 error = EFBIG; 622 goto errout; 623 } 624 auio.uio_resid = len; 625 do { 626 rcvflg = MSG_WAITALL; 627 error = (*so->so_receive)(so, (struct mbuf **)0, 628 &auio, mp, (struct mbuf **)0, &rcvflg); 629 } while (error == EWOULDBLOCK || error == EINTR || 630 error == ERESTART); 631 if (!error && auio.uio_resid > 0) { 632 if (len != auio.uio_resid) 633 log(LOG_INFO, 634 "short receive (%lu/%d) from nfs server %s\n", 635 (u_long)len - auio.uio_resid, len, 636 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 637 error = EPIPE; 638 } 639 } else { 640 /* 641 * NB: Since uio_resid is big, MSG_WAITALL is ignored 642 * and soreceive() will return when it has either a 643 * control msg or a data msg. 644 * We have no use for control msg., but must grab them 645 * and then throw them away so we know what is going 646 * on. 647 */ 648 auio.uio_resid = len = 100000000; /* Anything Big */ 649 auio.uio_procp = p; 650 do { 651 rcvflg = 0; 652 error = (*so->so_receive)(so, (struct mbuf **)0, 653 &auio, mp, &control, &rcvflg); 654 if (control) 655 m_freem(control); 656 if (error == EWOULDBLOCK && rep) { 657 if (rep->r_flags & R_SOFTTERM) 658 return (EINTR); 659 } 660 } while (error == EWOULDBLOCK || 661 (!error && *mp == NULL && control)); 662 if ((rcvflg & MSG_EOR) == 0) 663 printf("Egad!!\n"); 664 if (!error && *mp == NULL) 665 error = EPIPE; 666 len -= auio.uio_resid; 667 } 668 errout: 669 if (error && error != EINTR && error != ERESTART) { 670 m_freem(*mp); 671 *mp = (struct mbuf *)0; 672 if (error != EPIPE) 673 log(LOG_INFO, 674 "receive error %d from nfs server %s\n", 675 error, 676 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 677 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 678 if (!error) 679 error = nfs_reconnect(rep); 680 if (!error) 681 goto tryagain; 682 else 683 nfs_sndunlock(&rep->r_nmp->nm_iflag); 684 } 685 } else { 686 if ((so = rep->r_nmp->nm_so) == NULL) 687 return (EACCES); 688 if (so->so_state & SS_ISCONNECTED) 689 getnam = (struct mbuf **)0; 690 else 691 getnam = aname; 692 auio.uio_resid = len = 1000000; 693 auio.uio_procp = p; 694 do { 695 rcvflg = 0; 696 error = (*so->so_receive)(so, getnam, &auio, mp, 697 (struct mbuf **)0, &rcvflg); 698 if (error == EWOULDBLOCK && 699 (rep->r_flags & R_SOFTTERM)) 700 return (EINTR); 701 } while (error == EWOULDBLOCK); 702 len -= auio.uio_resid; 703 if (!error && *mp == NULL) 704 error = EPIPE; 705 } 706 if (error) { 707 m_freem(*mp); 708 *mp = (struct mbuf *)0; 709 } 710 return (error); 711 } 712 713 /* 714 * Implement receipt of reply on a socket. 715 * We must search through the list of received datagrams matching them 716 * with outstanding requests using the xid, until ours is found. 717 */ 718 /* ARGSUSED */ 719 int 720 nfs_reply(myrep) 721 struct nfsreq *myrep; 722 { 723 struct nfsreq *rep; 724 struct nfsmount *nmp = myrep->r_nmp; 725 int32_t t1; 726 struct mbuf *mrep, *nam, *md; 727 u_int32_t rxid, *tl; 728 caddr_t dpos, cp2; 729 int error; 730 731 /* 732 * Loop around until we get our own reply 733 */ 734 for (;;) { 735 /* 736 * Lock against other receivers so that I don't get stuck in 737 * sbwait() after someone else has received my reply for me. 738 * Also necessary for connection based protocols to avoid 739 * race conditions during a reconnect. 740 */ 741 error = nfs_rcvlock(myrep); 742 if (error == EALREADY) 743 return (0); 744 if (error) 745 return (error); 746 /* 747 * Get the next Rpc reply off the socket 748 */ 749 nmp->nm_waiters++; 750 error = nfs_receive(myrep, &nam, &mrep); 751 nfs_rcvunlock(&nmp->nm_iflag); 752 if (error) { 753 754 if (nmp->nm_iflag & NFSMNT_DISMNT) { 755 /* 756 * Oops, we're going away now.. 757 */ 758 nmp->nm_waiters--; 759 wakeup (&nmp->nm_waiters); 760 return error; 761 } 762 nmp->nm_waiters--; 763 /* 764 * Ignore routing errors on connectionless protocols? ? 765 */ 766 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 767 nmp->nm_so->so_error = 0; 768 #ifdef DEBUG 769 printf("nfs_reply: ignoring error %d\n", error); 770 #endif 771 if (myrep->r_flags & R_GETONEREP) 772 return (0); 773 continue; 774 } 775 return (error); 776 } 777 nmp->nm_waiters--; 778 if (nam) 779 m_freem(nam); 780 781 /* 782 * Get the xid and check that it is an rpc reply 783 */ 784 md = mrep; 785 dpos = mtod(md, caddr_t); 786 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 787 rxid = *tl++; 788 if (*tl != rpc_reply) { 789 #ifndef NFS_V2_ONLY 790 if (nmp->nm_flag & NFSMNT_NQNFS) { 791 if (nqnfs_callback(nmp, mrep, md, dpos)) 792 nfsstats.rpcinvalid++; 793 } else 794 #endif 795 { 796 nfsstats.rpcinvalid++; 797 m_freem(mrep); 798 } 799 nfsmout: 800 if (myrep->r_flags & R_GETONEREP) 801 return (0); 802 continue; 803 } 804 805 /* 806 * Loop through the request list to match up the reply 807 * Iff no match, just drop the datagram 808 */ 809 for (rep = nfs_reqq.tqh_first; rep != 0; 810 rep = rep->r_chain.tqe_next) { 811 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 812 /* Found it.. */ 813 rep->r_mrep = mrep; 814 rep->r_md = md; 815 rep->r_dpos = dpos; 816 if (nfsrtton) { 817 struct rttl *rt; 818 819 rt = &nfsrtt.rttl[nfsrtt.pos]; 820 rt->proc = rep->r_procnum; 821 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 822 rt->sent = nmp->nm_sent; 823 rt->cwnd = nmp->nm_cwnd; 824 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 825 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 826 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 827 rt->tstamp = time; 828 if (rep->r_flags & R_TIMING) 829 rt->rtt = rep->r_rtt; 830 else 831 rt->rtt = 1000000; 832 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 833 } 834 /* 835 * Update congestion window. 836 * Do the additive increase of 837 * one rpc/rtt. 838 */ 839 if (nmp->nm_cwnd <= nmp->nm_sent) { 840 nmp->nm_cwnd += 841 (NFS_CWNDSCALE * NFS_CWNDSCALE + 842 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 843 if (nmp->nm_cwnd > NFS_MAXCWND) 844 nmp->nm_cwnd = NFS_MAXCWND; 845 } 846 rep->r_flags &= ~R_SENT; 847 nmp->nm_sent -= NFS_CWNDSCALE; 848 /* 849 * Update rtt using a gain of 0.125 on the mean 850 * and a gain of 0.25 on the deviation. 851 */ 852 if (rep->r_flags & R_TIMING) { 853 /* 854 * Since the timer resolution of 855 * NFS_HZ is so course, it can often 856 * result in r_rtt == 0. Since 857 * r_rtt == N means that the actual 858 * rtt is between N+dt and N+2-dt ticks, 859 * add 1. 860 */ 861 t1 = rep->r_rtt + 1; 862 t1 -= (NFS_SRTT(rep) >> 3); 863 NFS_SRTT(rep) += t1; 864 if (t1 < 0) 865 t1 = -t1; 866 t1 -= (NFS_SDRTT(rep) >> 2); 867 NFS_SDRTT(rep) += t1; 868 } 869 nmp->nm_timeouts = 0; 870 break; 871 } 872 } 873 /* 874 * If not matched to a request, drop it. 875 * If it's mine, get out. 876 */ 877 if (rep == 0) { 878 nfsstats.rpcunexpected++; 879 m_freem(mrep); 880 } else if (rep == myrep) { 881 if (rep->r_mrep == NULL) 882 panic("nfsreply nil"); 883 return (0); 884 } 885 if (myrep->r_flags & R_GETONEREP) 886 return (0); 887 } 888 } 889 890 /* 891 * nfs_request - goes something like this 892 * - fill in request struct 893 * - links it into list 894 * - calls nfs_send() for first transmit 895 * - calls nfs_receive() to get reply 896 * - break down rpc header and return with nfs reply pointed to 897 * by mrep or error 898 * nb: always frees up mreq mbuf list 899 */ 900 int 901 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp) 902 struct vnode *vp; 903 struct mbuf *mrest; 904 int procnum; 905 struct proc *procp; 906 struct ucred *cred; 907 struct mbuf **mrp; 908 struct mbuf **mdp; 909 caddr_t *dposp; 910 { 911 struct mbuf *m, *mrep; 912 struct nfsreq *rep; 913 u_int32_t *tl; 914 int i; 915 struct nfsmount *nmp; 916 struct mbuf *md, *mheadend; 917 char nickv[RPCX_NICKVERF]; 918 time_t reqtime, waituntil; 919 caddr_t dpos, cp2; 920 int t1, s, error = 0, mrest_len, auth_len, auth_type; 921 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 922 int verf_len, verf_type; 923 u_int32_t xid; 924 char *auth_str, *verf_str; 925 NFSKERBKEY_T key; /* save session key */ 926 #ifndef NFS_V2_ONLY 927 int nqlflag, cachable; 928 u_quad_t frev; 929 struct nfsnode *np; 930 #endif 931 932 KASSERT(cred != NULL); 933 nmp = VFSTONFS(vp->v_mount); 934 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 935 rep->r_nmp = nmp; 936 rep->r_vp = vp; 937 rep->r_procp = procp; 938 rep->r_procnum = procnum; 939 i = 0; 940 m = mrest; 941 while (m) { 942 i += m->m_len; 943 m = m->m_next; 944 } 945 mrest_len = i; 946 947 /* 948 * Get the RPC header with authorization. 949 */ 950 kerbauth: 951 verf_str = auth_str = (char *)0; 952 if (nmp->nm_flag & NFSMNT_KERB) { 953 verf_str = nickv; 954 verf_len = sizeof (nickv); 955 auth_type = RPCAUTH_KERB4; 956 memset((caddr_t)key, 0, sizeof (key)); 957 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 958 &auth_len, verf_str, verf_len)) { 959 error = nfs_getauth(nmp, rep, cred, &auth_str, 960 &auth_len, verf_str, &verf_len, key); 961 if (error) { 962 free((caddr_t)rep, M_NFSREQ); 963 m_freem(mrest); 964 return (error); 965 } 966 } 967 } else { 968 auth_type = RPCAUTH_UNIX; 969 auth_len = (((cred->cr_ngroups > nmp->nm_numgrps) ? 970 nmp->nm_numgrps : cred->cr_ngroups) << 2) + 971 5 * NFSX_UNSIGNED; 972 } 973 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 974 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 975 if (auth_str) 976 free(auth_str, M_TEMP); 977 978 /* 979 * For stream protocols, insert a Sun RPC Record Mark. 980 */ 981 if (nmp->nm_sotype == SOCK_STREAM) { 982 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 983 *mtod(m, u_int32_t *) = htonl(0x80000000 | 984 (m->m_pkthdr.len - NFSX_UNSIGNED)); 985 } 986 rep->r_mreq = m; 987 rep->r_xid = xid; 988 tryagain: 989 if (nmp->nm_flag & NFSMNT_SOFT) 990 rep->r_retry = nmp->nm_retry; 991 else 992 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 993 rep->r_rtt = rep->r_rexmit = 0; 994 if (proct[procnum] > 0) 995 rep->r_flags = R_TIMING; 996 else 997 rep->r_flags = 0; 998 rep->r_mrep = NULL; 999 1000 /* 1001 * Do the client side RPC. 1002 */ 1003 nfsstats.rpcrequests++; 1004 /* 1005 * Chain request into list of outstanding requests. Be sure 1006 * to put it LAST so timer finds oldest requests first. 1007 */ 1008 s = splsoftnet(); 1009 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1010 1011 /* Get send time for nqnfs */ 1012 reqtime = time.tv_sec; 1013 1014 /* 1015 * If backing off another request or avoiding congestion, don't 1016 * send this one now but let timer do it. If not timing a request, 1017 * do it now. 1018 */ 1019 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1020 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1021 nmp->nm_sent < nmp->nm_cwnd)) { 1022 splx(s); 1023 if (nmp->nm_soflags & PR_CONNREQUIRED) 1024 error = nfs_sndlock(&nmp->nm_iflag, rep); 1025 if (!error) { 1026 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1027 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); 1028 if (nmp->nm_soflags & PR_CONNREQUIRED) 1029 nfs_sndunlock(&nmp->nm_iflag); 1030 } 1031 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1032 nmp->nm_sent += NFS_CWNDSCALE; 1033 rep->r_flags |= R_SENT; 1034 } 1035 } else { 1036 splx(s); 1037 rep->r_rtt = -1; 1038 } 1039 1040 /* 1041 * Wait for the reply from our send or the timer's. 1042 */ 1043 if (!error || error == EPIPE) 1044 error = nfs_reply(rep); 1045 1046 /* 1047 * RPC done, unlink the request. 1048 */ 1049 s = splsoftnet(); 1050 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1051 splx(s); 1052 1053 /* 1054 * Decrement the outstanding request count. 1055 */ 1056 if (rep->r_flags & R_SENT) { 1057 rep->r_flags &= ~R_SENT; /* paranoia */ 1058 nmp->nm_sent -= NFS_CWNDSCALE; 1059 } 1060 1061 /* 1062 * If there was a successful reply and a tprintf msg. 1063 * tprintf a response. 1064 */ 1065 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1066 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1067 "is alive again"); 1068 mrep = rep->r_mrep; 1069 md = rep->r_md; 1070 dpos = rep->r_dpos; 1071 if (error) { 1072 m_freem(rep->r_mreq); 1073 free((caddr_t)rep, M_NFSREQ); 1074 return (error); 1075 } 1076 1077 /* 1078 * break down the rpc header and check if ok 1079 */ 1080 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1081 if (*tl++ == rpc_msgdenied) { 1082 if (*tl == rpc_mismatch) 1083 error = EOPNOTSUPP; 1084 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1085 if (!failed_auth) { 1086 failed_auth++; 1087 mheadend->m_next = (struct mbuf *)0; 1088 m_freem(mrep); 1089 m_freem(rep->r_mreq); 1090 goto kerbauth; 1091 } else 1092 error = EAUTH; 1093 } else 1094 error = EACCES; 1095 m_freem(mrep); 1096 m_freem(rep->r_mreq); 1097 free((caddr_t)rep, M_NFSREQ); 1098 return (error); 1099 } 1100 1101 /* 1102 * Grab any Kerberos verifier, otherwise just throw it away. 1103 */ 1104 verf_type = fxdr_unsigned(int, *tl++); 1105 i = fxdr_unsigned(int32_t, *tl); 1106 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1107 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1108 if (error) 1109 goto nfsmout; 1110 } else if (i > 0) 1111 nfsm_adv(nfsm_rndup(i)); 1112 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1113 /* 0 == ok */ 1114 if (*tl == 0) { 1115 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1116 if (*tl != 0) { 1117 error = fxdr_unsigned(int, *tl); 1118 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1119 error == NFSERR_TRYLATER) { 1120 m_freem(mrep); 1121 error = 0; 1122 waituntil = time.tv_sec + trylater_delay; 1123 while (time.tv_sec < waituntil) 1124 (void) tsleep((caddr_t)&lbolt, 1125 PSOCK, "nqnfstry", 0); 1126 trylater_delay *= nfs_backoff[trylater_cnt]; 1127 if (trylater_cnt < 7) 1128 trylater_cnt++; 1129 goto tryagain; 1130 } 1131 1132 /* 1133 * If the File Handle was stale, invalidate the 1134 * lookup cache, just in case. 1135 */ 1136 if (error == ESTALE) 1137 cache_purge(vp); 1138 if (nmp->nm_flag & NFSMNT_NFSV3) { 1139 *mrp = mrep; 1140 *mdp = md; 1141 *dposp = dpos; 1142 error |= NFSERR_RETERR; 1143 } else 1144 m_freem(mrep); 1145 m_freem(rep->r_mreq); 1146 free((caddr_t)rep, M_NFSREQ); 1147 return (error); 1148 } 1149 1150 #ifndef NFS_V2_ONLY 1151 /* 1152 * For nqnfs, get any lease in reply 1153 */ 1154 if (nmp->nm_flag & NFSMNT_NQNFS) { 1155 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1156 if (*tl) { 1157 np = VTONFS(vp); 1158 nqlflag = fxdr_unsigned(int, *tl); 1159 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1160 cachable = fxdr_unsigned(int, *tl++); 1161 reqtime += fxdr_unsigned(int, *tl++); 1162 if (reqtime > time.tv_sec) { 1163 frev = fxdr_hyper(tl); 1164 nqnfs_clientlease(nmp, np, nqlflag, 1165 cachable, reqtime, frev); 1166 } 1167 } 1168 } 1169 #endif 1170 *mrp = mrep; 1171 *mdp = md; 1172 *dposp = dpos; 1173 m_freem(rep->r_mreq); 1174 FREE((caddr_t)rep, M_NFSREQ); 1175 return (0); 1176 } 1177 m_freem(mrep); 1178 error = EPROTONOSUPPORT; 1179 nfsmout: 1180 m_freem(rep->r_mreq); 1181 free((caddr_t)rep, M_NFSREQ); 1182 return (error); 1183 } 1184 #endif /* NFS */ 1185 1186 /* 1187 * Generate the rpc reply header 1188 * siz arg. is used to decide if adding a cluster is worthwhile 1189 */ 1190 int 1191 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1192 int siz; 1193 struct nfsrv_descript *nd; 1194 struct nfssvc_sock *slp; 1195 int err; 1196 int cache; 1197 u_quad_t *frev; 1198 struct mbuf **mrq; 1199 struct mbuf **mbp; 1200 caddr_t *bposp; 1201 { 1202 u_int32_t *tl; 1203 struct mbuf *mreq; 1204 caddr_t bpos; 1205 struct mbuf *mb, *mb2; 1206 1207 MGETHDR(mreq, M_WAIT, MT_DATA); 1208 mb = mreq; 1209 /* 1210 * If this is a big reply, use a cluster else 1211 * try and leave leading space for the lower level headers. 1212 */ 1213 siz += RPC_REPLYSIZ; 1214 if (siz >= max_datalen) { 1215 MCLGET(mreq, M_WAIT); 1216 } else 1217 mreq->m_data += max_hdr; 1218 tl = mtod(mreq, u_int32_t *); 1219 mreq->m_len = 6 * NFSX_UNSIGNED; 1220 bpos = ((caddr_t)tl) + mreq->m_len; 1221 *tl++ = txdr_unsigned(nd->nd_retxid); 1222 *tl++ = rpc_reply; 1223 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1224 *tl++ = rpc_msgdenied; 1225 if (err & NFSERR_AUTHERR) { 1226 *tl++ = rpc_autherr; 1227 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1228 mreq->m_len -= NFSX_UNSIGNED; 1229 bpos -= NFSX_UNSIGNED; 1230 } else { 1231 *tl++ = rpc_mismatch; 1232 *tl++ = txdr_unsigned(RPC_VER2); 1233 *tl = txdr_unsigned(RPC_VER2); 1234 } 1235 } else { 1236 *tl++ = rpc_msgaccepted; 1237 1238 /* 1239 * For Kerberos authentication, we must send the nickname 1240 * verifier back, otherwise just RPCAUTH_NULL. 1241 */ 1242 if (nd->nd_flag & ND_KERBFULL) { 1243 struct nfsuid *nuidp; 1244 struct timeval ktvin, ktvout; 1245 1246 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1247 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1248 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1249 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1250 &nuidp->nu_haddr, nd->nd_nam2))) 1251 break; 1252 } 1253 if (nuidp) { 1254 ktvin.tv_sec = 1255 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1256 ktvin.tv_usec = 1257 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1258 1259 /* 1260 * Encrypt the timestamp in ecb mode using the 1261 * session key. 1262 */ 1263 #ifdef NFSKERB 1264 XXX 1265 #endif 1266 1267 *tl++ = rpc_auth_kerb; 1268 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1269 *tl = ktvout.tv_sec; 1270 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1271 *tl++ = ktvout.tv_usec; 1272 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1273 } else { 1274 *tl++ = 0; 1275 *tl++ = 0; 1276 } 1277 } else { 1278 *tl++ = 0; 1279 *tl++ = 0; 1280 } 1281 switch (err) { 1282 case EPROGUNAVAIL: 1283 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1284 break; 1285 case EPROGMISMATCH: 1286 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1287 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1288 if (nd->nd_flag & ND_NQNFS) { 1289 *tl++ = txdr_unsigned(3); 1290 *tl = txdr_unsigned(3); 1291 } else { 1292 *tl++ = txdr_unsigned(2); 1293 *tl = txdr_unsigned(3); 1294 } 1295 break; 1296 case EPROCUNAVAIL: 1297 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1298 break; 1299 case EBADRPC: 1300 *tl = txdr_unsigned(RPC_GARBAGE); 1301 break; 1302 default: 1303 *tl = 0; 1304 if (err != NFSERR_RETVOID) { 1305 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1306 if (err) 1307 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1308 else 1309 *tl = 0; 1310 } 1311 break; 1312 }; 1313 } 1314 1315 /* 1316 * For nqnfs, piggyback lease as requested. 1317 */ 1318 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1319 if (nd->nd_flag & ND_LEASE) { 1320 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1321 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1322 *tl++ = txdr_unsigned(cache); 1323 *tl++ = txdr_unsigned(nd->nd_duration); 1324 txdr_hyper(*frev, tl); 1325 } else { 1326 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1327 *tl = 0; 1328 } 1329 } 1330 if (mrq != NULL) 1331 *mrq = mreq; 1332 *mbp = mb; 1333 *bposp = bpos; 1334 if (err != 0 && err != NFSERR_RETVOID) 1335 nfsstats.srvrpc_errs++; 1336 return (0); 1337 } 1338 1339 /* 1340 * Nfs timer routine 1341 * Scan the nfsreq list and retranmit any requests that have timed out 1342 * To avoid retransmission attempts on STREAM sockets (in the future) make 1343 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1344 */ 1345 void 1346 nfs_timer(arg) 1347 void *arg; /* never used */ 1348 { 1349 struct nfsreq *rep; 1350 struct mbuf *m; 1351 struct socket *so; 1352 struct nfsmount *nmp; 1353 int timeo; 1354 int s, error; 1355 #ifdef NFSSERVER 1356 struct nfssvc_sock *slp; 1357 static long lasttime = 0; 1358 u_quad_t cur_usec; 1359 #endif 1360 1361 s = splsoftnet(); 1362 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) { 1363 nmp = rep->r_nmp; 1364 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1365 continue; 1366 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1367 rep->r_flags |= R_SOFTTERM; 1368 continue; 1369 } 1370 if (rep->r_rtt >= 0) { 1371 rep->r_rtt++; 1372 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1373 timeo = nmp->nm_timeo; 1374 else 1375 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1376 if (nmp->nm_timeouts > 0) 1377 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1378 if (rep->r_rtt <= timeo) 1379 continue; 1380 if (nmp->nm_timeouts < 8) 1381 nmp->nm_timeouts++; 1382 } 1383 /* 1384 * Check for server not responding 1385 */ 1386 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1387 rep->r_rexmit > nmp->nm_deadthresh) { 1388 nfs_msg(rep->r_procp, 1389 nmp->nm_mountp->mnt_stat.f_mntfromname, 1390 "not responding"); 1391 rep->r_flags |= R_TPRINTFMSG; 1392 } 1393 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1394 nfsstats.rpctimeouts++; 1395 rep->r_flags |= R_SOFTTERM; 1396 continue; 1397 } 1398 if (nmp->nm_sotype != SOCK_DGRAM) { 1399 if (++rep->r_rexmit > NFS_MAXREXMIT) 1400 rep->r_rexmit = NFS_MAXREXMIT; 1401 continue; 1402 } 1403 if ((so = nmp->nm_so) == NULL) 1404 continue; 1405 1406 /* 1407 * If there is enough space and the window allows.. 1408 * Resend it 1409 * Set r_rtt to -1 in case we fail to send it now. 1410 */ 1411 rep->r_rtt = -1; 1412 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1413 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1414 (rep->r_flags & R_SENT) || 1415 nmp->nm_sent < nmp->nm_cwnd) && 1416 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1417 if (so->so_state & SS_ISCONNECTED) 1418 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1419 (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); 1420 else 1421 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1422 nmp->nm_nam, (struct mbuf *)0, (struct proc *)0); 1423 if (error) { 1424 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1425 #ifdef DEBUG 1426 printf("nfs_timer: ignoring error %d\n", 1427 error); 1428 #endif 1429 so->so_error = 0; 1430 } 1431 } else { 1432 /* 1433 * Iff first send, start timing 1434 * else turn timing off, backoff timer 1435 * and divide congestion window by 2. 1436 */ 1437 if (rep->r_flags & R_SENT) { 1438 rep->r_flags &= ~R_TIMING; 1439 if (++rep->r_rexmit > NFS_MAXREXMIT) 1440 rep->r_rexmit = NFS_MAXREXMIT; 1441 nmp->nm_cwnd >>= 1; 1442 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1443 nmp->nm_cwnd = NFS_CWNDSCALE; 1444 nfsstats.rpcretries++; 1445 } else { 1446 rep->r_flags |= R_SENT; 1447 nmp->nm_sent += NFS_CWNDSCALE; 1448 } 1449 rep->r_rtt = 0; 1450 } 1451 } 1452 } 1453 1454 #ifdef NFSSERVER 1455 /* 1456 * Call the nqnfs server timer once a second to handle leases. 1457 */ 1458 if (lasttime != time.tv_sec) { 1459 lasttime = time.tv_sec; 1460 nqnfs_serverd(); 1461 } 1462 1463 /* 1464 * Scan the write gathering queues for writes that need to be 1465 * completed now. 1466 */ 1467 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec; 1468 for (slp = nfssvc_sockhead.tqh_first; slp != 0; 1469 slp = slp->ns_chain.tqe_next) { 1470 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) 1471 nfsrv_wakenfsd(slp); 1472 } 1473 #endif /* NFSSERVER */ 1474 splx(s); 1475 callout_reset(&nfs_timer_ch, nfs_ticks, nfs_timer, NULL); 1476 } 1477 1478 /* 1479 * Test for a termination condition pending on the process. 1480 * This is used for NFSMNT_INT mounts. 1481 */ 1482 int 1483 nfs_sigintr(nmp, rep, p) 1484 struct nfsmount *nmp; 1485 struct nfsreq *rep; 1486 struct proc *p; 1487 { 1488 sigset_t ss; 1489 1490 if (rep && (rep->r_flags & R_SOFTTERM)) 1491 return (EINTR); 1492 if (!(nmp->nm_flag & NFSMNT_INT)) 1493 return (0); 1494 if (p) { 1495 sigpending1(p, &ss); 1496 #if 0 1497 sigminusset(&p->p_sigctx.ps_sigignore, &ss); 1498 #endif 1499 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1500 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1501 sigismember(&ss, SIGQUIT)) 1502 return (EINTR); 1503 } 1504 return (0); 1505 } 1506 1507 /* 1508 * Lock a socket against others. 1509 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1510 * and also to avoid race conditions between the processes with nfs requests 1511 * in progress when a reconnect is necessary. 1512 */ 1513 int 1514 nfs_sndlock(flagp, rep) 1515 int *flagp; 1516 struct nfsreq *rep; 1517 { 1518 struct proc *p; 1519 int slpflag = 0, slptimeo = 0; 1520 1521 if (rep) { 1522 p = rep->r_procp; 1523 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1524 slpflag = PCATCH; 1525 } else 1526 p = (struct proc *)0; 1527 while (*flagp & NFSMNT_SNDLOCK) { 1528 if (nfs_sigintr(rep->r_nmp, rep, p)) 1529 return (EINTR); 1530 *flagp |= NFSMNT_WANTSND; 1531 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1532 slptimeo); 1533 if (slpflag == PCATCH) { 1534 slpflag = 0; 1535 slptimeo = 2 * hz; 1536 } 1537 } 1538 *flagp |= NFSMNT_SNDLOCK; 1539 return (0); 1540 } 1541 1542 /* 1543 * Unlock the stream socket for others. 1544 */ 1545 void 1546 nfs_sndunlock(flagp) 1547 int *flagp; 1548 { 1549 1550 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1551 panic("nfs sndunlock"); 1552 *flagp &= ~NFSMNT_SNDLOCK; 1553 if (*flagp & NFSMNT_WANTSND) { 1554 *flagp &= ~NFSMNT_WANTSND; 1555 wakeup((caddr_t)flagp); 1556 } 1557 } 1558 1559 int 1560 nfs_rcvlock(rep) 1561 struct nfsreq *rep; 1562 { 1563 struct nfsmount *nmp = rep->r_nmp; 1564 int *flagp = &nmp->nm_iflag; 1565 int slpflag, slptimeo = 0; 1566 1567 if (*flagp & NFSMNT_DISMNT) 1568 return EIO; 1569 1570 if (*flagp & NFSMNT_INT) 1571 slpflag = PCATCH; 1572 else 1573 slpflag = 0; 1574 while (*flagp & NFSMNT_RCVLOCK) { 1575 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1576 return (EINTR); 1577 *flagp |= NFSMNT_WANTRCV; 1578 nmp->nm_waiters++; 1579 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1580 slptimeo); 1581 nmp->nm_waiters--; 1582 if (*flagp & NFSMNT_DISMNT) { 1583 wakeup(&nmp->nm_waiters); 1584 return EIO; 1585 } 1586 /* If our reply was received while we were sleeping, 1587 * then just return without taking the lock to avoid a 1588 * situation where a single iod could 'capture' the 1589 * receive lock. 1590 */ 1591 if (rep->r_mrep != NULL) 1592 return (EALREADY); 1593 if (slpflag == PCATCH) { 1594 slpflag = 0; 1595 slptimeo = 2 * hz; 1596 } 1597 } 1598 *flagp |= NFSMNT_RCVLOCK; 1599 return (0); 1600 } 1601 1602 /* 1603 * Unlock the stream socket for others. 1604 */ 1605 void 1606 nfs_rcvunlock(flagp) 1607 int *flagp; 1608 { 1609 1610 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1611 panic("nfs rcvunlock"); 1612 *flagp &= ~NFSMNT_RCVLOCK; 1613 if (*flagp & NFSMNT_WANTRCV) { 1614 *flagp &= ~NFSMNT_WANTRCV; 1615 wakeup((caddr_t)flagp); 1616 } 1617 } 1618 1619 /* 1620 * Parse an RPC request 1621 * - verify it 1622 * - fill in the cred struct. 1623 */ 1624 int 1625 nfs_getreq(nd, nfsd, has_header) 1626 struct nfsrv_descript *nd; 1627 struct nfsd *nfsd; 1628 int has_header; 1629 { 1630 int len, i; 1631 u_int32_t *tl; 1632 int32_t t1; 1633 struct uio uio; 1634 struct iovec iov; 1635 caddr_t dpos, cp2, cp; 1636 u_int32_t nfsvers, auth_type; 1637 uid_t nickuid; 1638 int error = 0, nqnfs = 0, ticklen; 1639 struct mbuf *mrep, *md; 1640 struct nfsuid *nuidp; 1641 struct timeval tvin, tvout; 1642 1643 mrep = nd->nd_mrep; 1644 md = nd->nd_md; 1645 dpos = nd->nd_dpos; 1646 if (has_header) { 1647 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1648 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1649 if (*tl++ != rpc_call) { 1650 m_freem(mrep); 1651 return (EBADRPC); 1652 } 1653 } else 1654 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1655 nd->nd_repstat = 0; 1656 nd->nd_flag = 0; 1657 if (*tl++ != rpc_vers) { 1658 nd->nd_repstat = ERPCMISMATCH; 1659 nd->nd_procnum = NFSPROC_NOOP; 1660 return (0); 1661 } 1662 if (*tl != nfs_prog) { 1663 if (*tl == nqnfs_prog) 1664 nqnfs++; 1665 else { 1666 nd->nd_repstat = EPROGUNAVAIL; 1667 nd->nd_procnum = NFSPROC_NOOP; 1668 return (0); 1669 } 1670 } 1671 tl++; 1672 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1673 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1674 (nfsvers != NQNFS_VER3 && nqnfs)) { 1675 nd->nd_repstat = EPROGMISMATCH; 1676 nd->nd_procnum = NFSPROC_NOOP; 1677 return (0); 1678 } 1679 if (nqnfs) 1680 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1681 else if (nfsvers == NFS_VER3) 1682 nd->nd_flag = ND_NFSV3; 1683 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1684 if (nd->nd_procnum == NFSPROC_NULL) 1685 return (0); 1686 if (nd->nd_procnum >= NFS_NPROCS || 1687 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1688 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1689 nd->nd_repstat = EPROCUNAVAIL; 1690 nd->nd_procnum = NFSPROC_NOOP; 1691 return (0); 1692 } 1693 if ((nd->nd_flag & ND_NFSV3) == 0) 1694 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1695 auth_type = *tl++; 1696 len = fxdr_unsigned(int, *tl++); 1697 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1698 m_freem(mrep); 1699 return (EBADRPC); 1700 } 1701 1702 nd->nd_flag &= ~ND_KERBAUTH; 1703 /* 1704 * Handle auth_unix or auth_kerb. 1705 */ 1706 if (auth_type == rpc_auth_unix) { 1707 len = fxdr_unsigned(int, *++tl); 1708 if (len < 0 || len > NFS_MAXNAMLEN) { 1709 m_freem(mrep); 1710 return (EBADRPC); 1711 } 1712 nfsm_adv(nfsm_rndup(len)); 1713 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1714 memset((caddr_t)&nd->nd_cr, 0, sizeof (struct ucred)); 1715 nd->nd_cr.cr_ref = 1; 1716 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1717 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1718 len = fxdr_unsigned(int, *tl); 1719 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1720 m_freem(mrep); 1721 return (EBADRPC); 1722 } 1723 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1724 for (i = 0; i < len; i++) 1725 if (i < NGROUPS) 1726 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1727 else 1728 tl++; 1729 nd->nd_cr.cr_ngroups = (len > NGROUPS) ? NGROUPS : len; 1730 if (nd->nd_cr.cr_ngroups > 1) 1731 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1732 len = fxdr_unsigned(int, *++tl); 1733 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1734 m_freem(mrep); 1735 return (EBADRPC); 1736 } 1737 if (len > 0) 1738 nfsm_adv(nfsm_rndup(len)); 1739 } else if (auth_type == rpc_auth_kerb) { 1740 switch (fxdr_unsigned(int, *tl++)) { 1741 case RPCAKN_FULLNAME: 1742 ticklen = fxdr_unsigned(int, *tl); 1743 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1744 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1745 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1746 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1747 m_freem(mrep); 1748 return (EBADRPC); 1749 } 1750 uio.uio_offset = 0; 1751 uio.uio_iov = &iov; 1752 uio.uio_iovcnt = 1; 1753 uio.uio_segflg = UIO_SYSSPACE; 1754 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1755 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1756 nfsm_mtouio(&uio, uio.uio_resid); 1757 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1758 if (*tl++ != rpc_auth_kerb || 1759 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1760 printf("Bad kerb verifier\n"); 1761 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1762 nd->nd_procnum = NFSPROC_NOOP; 1763 return (0); 1764 } 1765 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1766 tl = (u_int32_t *)cp; 1767 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1768 printf("Not fullname kerb verifier\n"); 1769 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1770 nd->nd_procnum = NFSPROC_NOOP; 1771 return (0); 1772 } 1773 cp += NFSX_UNSIGNED; 1774 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 1775 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1776 nd->nd_flag |= ND_KERBFULL; 1777 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1778 break; 1779 case RPCAKN_NICKNAME: 1780 if (len != 2 * NFSX_UNSIGNED) { 1781 printf("Kerb nickname short\n"); 1782 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1783 nd->nd_procnum = NFSPROC_NOOP; 1784 return (0); 1785 } 1786 nickuid = fxdr_unsigned(uid_t, *tl); 1787 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1788 if (*tl++ != rpc_auth_kerb || 1789 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1790 printf("Kerb nick verifier bad\n"); 1791 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1792 nd->nd_procnum = NFSPROC_NOOP; 1793 return (0); 1794 } 1795 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1796 tvin.tv_sec = *tl++; 1797 tvin.tv_usec = *tl; 1798 1799 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 1800 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1801 if (nuidp->nu_cr.cr_uid == nickuid && 1802 (!nd->nd_nam2 || 1803 netaddr_match(NU_NETFAM(nuidp), 1804 &nuidp->nu_haddr, nd->nd_nam2))) 1805 break; 1806 } 1807 if (!nuidp) { 1808 nd->nd_repstat = 1809 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1810 nd->nd_procnum = NFSPROC_NOOP; 1811 return (0); 1812 } 1813 1814 /* 1815 * Now, decrypt the timestamp using the session key 1816 * and validate it. 1817 */ 1818 #ifdef NFSKERB 1819 XXX 1820 #endif 1821 1822 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1823 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1824 if (nuidp->nu_expire < time.tv_sec || 1825 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1826 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1827 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1828 nuidp->nu_expire = 0; 1829 nd->nd_repstat = 1830 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1831 nd->nd_procnum = NFSPROC_NOOP; 1832 return (0); 1833 } 1834 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1835 nd->nd_flag |= ND_KERBNICK; 1836 }; 1837 } else { 1838 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1839 nd->nd_procnum = NFSPROC_NOOP; 1840 return (0); 1841 } 1842 1843 /* 1844 * For nqnfs, get piggybacked lease request. 1845 */ 1846 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1847 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1848 nd->nd_flag |= fxdr_unsigned(int, *tl); 1849 if (nd->nd_flag & ND_LEASE) { 1850 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1851 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 1852 } else 1853 nd->nd_duration = NQ_MINLEASE; 1854 } else 1855 nd->nd_duration = NQ_MINLEASE; 1856 nd->nd_md = md; 1857 nd->nd_dpos = dpos; 1858 return (0); 1859 nfsmout: 1860 return (error); 1861 } 1862 1863 int 1864 nfs_msg(p, server, msg) 1865 struct proc *p; 1866 char *server, *msg; 1867 { 1868 tpr_t tpr; 1869 1870 if (p) 1871 tpr = tprintf_open(p); 1872 else 1873 tpr = NULL; 1874 tprintf(tpr, "nfs server %s: %s\n", server, msg); 1875 tprintf_close(tpr); 1876 return (0); 1877 } 1878 1879 #ifdef NFSSERVER 1880 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 1881 struct nfssvc_sock *, struct proc *, 1882 struct mbuf **)) = { 1883 nfsrv_null, 1884 nfsrv_getattr, 1885 nfsrv_setattr, 1886 nfsrv_lookup, 1887 nfsrv3_access, 1888 nfsrv_readlink, 1889 nfsrv_read, 1890 nfsrv_write, 1891 nfsrv_create, 1892 nfsrv_mkdir, 1893 nfsrv_symlink, 1894 nfsrv_mknod, 1895 nfsrv_remove, 1896 nfsrv_rmdir, 1897 nfsrv_rename, 1898 nfsrv_link, 1899 nfsrv_readdir, 1900 nfsrv_readdirplus, 1901 nfsrv_statfs, 1902 nfsrv_fsinfo, 1903 nfsrv_pathconf, 1904 nfsrv_commit, 1905 nqnfsrv_getlease, 1906 nqnfsrv_vacated, 1907 nfsrv_noop, 1908 nfsrv_noop 1909 }; 1910 1911 /* 1912 * Socket upcall routine for the nfsd sockets. 1913 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1914 * Essentially do as much as possible non-blocking, else punt and it will 1915 * be called with M_WAIT from an nfsd. 1916 */ 1917 void 1918 nfsrv_rcv(so, arg, waitflag) 1919 struct socket *so; 1920 caddr_t arg; 1921 int waitflag; 1922 { 1923 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1924 struct mbuf *m; 1925 struct mbuf *mp, *nam; 1926 struct uio auio; 1927 int flags, error; 1928 1929 if ((slp->ns_flag & SLP_VALID) == 0) 1930 return; 1931 #ifdef notdef 1932 /* 1933 * Define this to test for nfsds handling this under heavy load. 1934 */ 1935 if (waitflag == M_DONTWAIT) { 1936 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 1937 } 1938 #endif 1939 auio.uio_procp = NULL; 1940 if (so->so_type == SOCK_STREAM) { 1941 /* 1942 * If there are already records on the queue, defer soreceive() 1943 * to an nfsd so that there is feedback to the TCP layer that 1944 * the nfs servers are heavily loaded. 1945 */ 1946 if (slp->ns_rec && waitflag == M_DONTWAIT) { 1947 slp->ns_flag |= SLP_NEEDQ; 1948 goto dorecs; 1949 } 1950 1951 /* 1952 * Do soreceive(). 1953 */ 1954 auio.uio_resid = 1000000000; 1955 flags = MSG_DONTWAIT; 1956 error = (*so->so_receive)(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 1957 if (error || mp == (struct mbuf *)0) { 1958 if (error == EWOULDBLOCK) 1959 slp->ns_flag |= SLP_NEEDQ; 1960 else 1961 slp->ns_flag |= SLP_DISCONN; 1962 goto dorecs; 1963 } 1964 m = mp; 1965 if (slp->ns_rawend) { 1966 slp->ns_rawend->m_next = m; 1967 slp->ns_cc += 1000000000 - auio.uio_resid; 1968 } else { 1969 slp->ns_raw = m; 1970 slp->ns_cc = 1000000000 - auio.uio_resid; 1971 } 1972 while (m->m_next) 1973 m = m->m_next; 1974 slp->ns_rawend = m; 1975 1976 /* 1977 * Now try and parse record(s) out of the raw stream data. 1978 */ 1979 error = nfsrv_getstream(slp, waitflag); 1980 if (error) { 1981 if (error == EPERM) 1982 slp->ns_flag |= SLP_DISCONN; 1983 else 1984 slp->ns_flag |= SLP_NEEDQ; 1985 } 1986 } else { 1987 do { 1988 auio.uio_resid = 1000000000; 1989 flags = MSG_DONTWAIT; 1990 error = (*so->so_receive)(so, &nam, &auio, &mp, 1991 (struct mbuf **)0, &flags); 1992 if (mp) { 1993 if (nam) { 1994 m = nam; 1995 m->m_next = mp; 1996 } else 1997 m = mp; 1998 if (slp->ns_recend) 1999 slp->ns_recend->m_nextpkt = m; 2000 else 2001 slp->ns_rec = m; 2002 slp->ns_recend = m; 2003 m->m_nextpkt = (struct mbuf *)0; 2004 } 2005 if (error) { 2006 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2007 && error != EWOULDBLOCK) { 2008 slp->ns_flag |= SLP_DISCONN; 2009 goto dorecs; 2010 } 2011 } 2012 } while (mp); 2013 } 2014 2015 /* 2016 * Now try and process the request records, non-blocking. 2017 */ 2018 dorecs: 2019 if (waitflag == M_DONTWAIT && 2020 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2021 nfsrv_wakenfsd(slp); 2022 } 2023 2024 /* 2025 * Try and extract an RPC request from the mbuf data list received on a 2026 * stream socket. The "waitflag" argument indicates whether or not it 2027 * can sleep. 2028 */ 2029 int 2030 nfsrv_getstream(slp, waitflag) 2031 struct nfssvc_sock *slp; 2032 int waitflag; 2033 { 2034 struct mbuf *m, **mpp; 2035 char *cp1, *cp2; 2036 int len; 2037 struct mbuf *om, *m2, *recm = NULL; 2038 u_int32_t recmark; 2039 2040 if (slp->ns_flag & SLP_GETSTREAM) 2041 panic("nfs getstream"); 2042 slp->ns_flag |= SLP_GETSTREAM; 2043 for (;;) { 2044 if (slp->ns_reclen == 0) { 2045 if (slp->ns_cc < NFSX_UNSIGNED) { 2046 slp->ns_flag &= ~SLP_GETSTREAM; 2047 return (0); 2048 } 2049 m = slp->ns_raw; 2050 if (m->m_len >= NFSX_UNSIGNED) { 2051 memcpy((caddr_t)&recmark, mtod(m, caddr_t), NFSX_UNSIGNED); 2052 m->m_data += NFSX_UNSIGNED; 2053 m->m_len -= NFSX_UNSIGNED; 2054 } else { 2055 cp1 = (caddr_t)&recmark; 2056 cp2 = mtod(m, caddr_t); 2057 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2058 while (m->m_len == 0) { 2059 m = m->m_next; 2060 cp2 = mtod(m, caddr_t); 2061 } 2062 *cp1++ = *cp2++; 2063 m->m_data++; 2064 m->m_len--; 2065 } 2066 } 2067 slp->ns_cc -= NFSX_UNSIGNED; 2068 recmark = ntohl(recmark); 2069 slp->ns_reclen = recmark & ~0x80000000; 2070 if (recmark & 0x80000000) 2071 slp->ns_flag |= SLP_LASTFRAG; 2072 else 2073 slp->ns_flag &= ~SLP_LASTFRAG; 2074 if (slp->ns_reclen > NFS_MAXPACKET) { 2075 slp->ns_flag &= ~SLP_GETSTREAM; 2076 return (EPERM); 2077 } 2078 } 2079 2080 /* 2081 * Now get the record part. 2082 */ 2083 if (slp->ns_cc == slp->ns_reclen) { 2084 recm = slp->ns_raw; 2085 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2086 slp->ns_cc = slp->ns_reclen = 0; 2087 } else if (slp->ns_cc > slp->ns_reclen) { 2088 len = 0; 2089 m = slp->ns_raw; 2090 om = (struct mbuf *)0; 2091 while (len < slp->ns_reclen) { 2092 if ((len + m->m_len) > slp->ns_reclen) { 2093 size_t left = slp->ns_reclen - len; 2094 2095 MGETHDR(m2, waitflag, m->m_type); 2096 if (m2 == NULL) { 2097 slp->ns_flag &= ~SLP_GETSTREAM; 2098 return (EWOULDBLOCK); 2099 } 2100 if (left > MHLEN) { 2101 MCLGET(m2, waitflag); 2102 if (!(m2->m_flags & M_EXT)) { 2103 m_freem(m2); 2104 slp->ns_flag &= ~SLP_GETSTREAM; 2105 return (EWOULDBLOCK); 2106 } 2107 } 2108 memcpy(mtod(m2, caddr_t), mtod(m, caddr_t), 2109 left); 2110 m2->m_len = left; 2111 m->m_data += left; 2112 m->m_len -= left; 2113 if (om) { 2114 om->m_next = m2; 2115 recm = slp->ns_raw; 2116 } else 2117 recm = m2; 2118 len = slp->ns_reclen; 2119 } else if ((len + m->m_len) == slp->ns_reclen) { 2120 om = m; 2121 len += m->m_len; 2122 m = m->m_next; 2123 recm = slp->ns_raw; 2124 om->m_next = (struct mbuf *)0; 2125 } else { 2126 om = m; 2127 len += m->m_len; 2128 m = m->m_next; 2129 } 2130 } 2131 slp->ns_raw = m; 2132 slp->ns_cc -= len; 2133 slp->ns_reclen = 0; 2134 } else { 2135 slp->ns_flag &= ~SLP_GETSTREAM; 2136 return (0); 2137 } 2138 2139 /* 2140 * Accumulate the fragments into a record. 2141 */ 2142 mpp = &slp->ns_frag; 2143 while (*mpp) 2144 mpp = &((*mpp)->m_next); 2145 *mpp = recm; 2146 if (slp->ns_flag & SLP_LASTFRAG) { 2147 if (slp->ns_recend) 2148 slp->ns_recend->m_nextpkt = slp->ns_frag; 2149 else 2150 slp->ns_rec = slp->ns_frag; 2151 slp->ns_recend = slp->ns_frag; 2152 slp->ns_frag = (struct mbuf *)0; 2153 } 2154 } 2155 } 2156 2157 /* 2158 * Parse an RPC header. 2159 */ 2160 int 2161 nfsrv_dorec(slp, nfsd, ndp) 2162 struct nfssvc_sock *slp; 2163 struct nfsd *nfsd; 2164 struct nfsrv_descript **ndp; 2165 { 2166 struct mbuf *m, *nam; 2167 struct nfsrv_descript *nd; 2168 int error; 2169 2170 *ndp = NULL; 2171 if ((slp->ns_flag & SLP_VALID) == 0 || 2172 (m = slp->ns_rec) == (struct mbuf *)0) 2173 return (ENOBUFS); 2174 slp->ns_rec = m->m_nextpkt; 2175 if (slp->ns_rec) 2176 m->m_nextpkt = (struct mbuf *)0; 2177 else 2178 slp->ns_recend = (struct mbuf *)0; 2179 if (m->m_type == MT_SONAME) { 2180 nam = m; 2181 m = m->m_next; 2182 nam->m_next = NULL; 2183 } else 2184 nam = NULL; 2185 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2186 M_NFSRVDESC, M_WAITOK); 2187 nd->nd_md = nd->nd_mrep = m; 2188 nd->nd_nam2 = nam; 2189 nd->nd_dpos = mtod(m, caddr_t); 2190 error = nfs_getreq(nd, nfsd, TRUE); 2191 if (error) { 2192 m_freem(nam); 2193 free((caddr_t)nd, M_NFSRVDESC); 2194 return (error); 2195 } 2196 *ndp = nd; 2197 nfsd->nfsd_nd = nd; 2198 return (0); 2199 } 2200 2201 2202 /* 2203 * Search for a sleeping nfsd and wake it up. 2204 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2205 * running nfsds will go look for the work in the nfssvc_sock list. 2206 */ 2207 void 2208 nfsrv_wakenfsd(slp) 2209 struct nfssvc_sock *slp; 2210 { 2211 struct nfsd *nd; 2212 2213 if ((slp->ns_flag & SLP_VALID) == 0) 2214 return; 2215 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) { 2216 if (nd->nfsd_flag & NFSD_WAITING) { 2217 nd->nfsd_flag &= ~NFSD_WAITING; 2218 if (nd->nfsd_slp) 2219 panic("nfsd wakeup"); 2220 slp->ns_sref++; 2221 nd->nfsd_slp = slp; 2222 wakeup((caddr_t)nd); 2223 return; 2224 } 2225 } 2226 slp->ns_flag |= SLP_DOREC; 2227 nfsd_head_flag |= NFSD_CHECKSLP; 2228 } 2229 #endif /* NFSSERVER */ 2230