1 /* $OpenBSD: nfs_socket.c,v 1.154 2024/09/18 05:21:19 jsg Exp $ */ 2 /* $NetBSD: nfs_socket.c,v 1.27 1996/04/15 20:20:00 thorpej Exp $ */ 3 4 /* 5 * Copyright (c) 1989, 1991, 1993, 1995 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 36 */ 37 38 /* 39 * Socket operations for use by nfs 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/mount.h> 46 #include <sys/kernel.h> 47 #include <sys/mbuf.h> 48 #include <sys/vnode.h> 49 #include <sys/protosw.h> 50 #include <sys/signalvar.h> 51 #include <sys/socket.h> 52 #include <sys/socketvar.h> 53 #include <sys/syslog.h> 54 #include <sys/tprintf.h> 55 #include <sys/namei.h> 56 #include <sys/pool.h> 57 #include <sys/queue.h> 58 59 #include <netinet/in.h> 60 #include <netinet/tcp.h> 61 62 #include <nfs/rpcv2.h> 63 #include <nfs/nfsproto.h> 64 #include <nfs/nfs.h> 65 #include <nfs/xdr_subs.h> 66 #include <nfs/nfsmount.h> 67 #include <nfs/nfs_var.h> 68 #include <nfs/nfsm_subs.h> 69 70 /* External data, mostly RPC constants in XDR form. */ 71 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 72 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr; 73 extern u_int32_t nfs_prog; 74 extern struct nfsstats nfsstats; 75 extern const int nfsv3_procid[NFS_NPROCS]; 76 extern int nfs_ticks; 77 78 extern struct pool nfsrv_descript_pl; 79 80 /* 81 * There is a congestion window for outstanding rpcs maintained per mount 82 * point. The cwnd size is adjusted in roughly the way that: 83 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 84 * SIGCOMM '88". ACM, August 1988. 85 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 86 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 87 * of rpcs is in progress. 88 * (The sent count and cwnd are scaled for integer arith.) 89 * Variants of "slow start" were tried and were found to be too much of a 90 * performance hit (ave. rtt 3 times larger), 91 * I suspect due to the large rtt that nfs rpcs have. 92 */ 93 #define NFS_CWNDSCALE 256 94 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 95 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256 }; 96 97 /* RTT estimator */ 98 static const enum nfs_rto_timers nfs_ptimers[NFS_NPROCS] = { 99 NFS_DEFAULT_TIMER, /* NULL */ 100 NFS_GETATTR_TIMER, /* GETATTR */ 101 NFS_DEFAULT_TIMER, /* SETATTR */ 102 NFS_LOOKUP_TIMER, /* LOOKUP */ 103 NFS_GETATTR_TIMER, /* ACCESS */ 104 NFS_READ_TIMER, /* READLINK */ 105 NFS_READ_TIMER, /* READ */ 106 NFS_WRITE_TIMER, /* WRITE */ 107 NFS_DEFAULT_TIMER, /* CREATE */ 108 NFS_DEFAULT_TIMER, /* MKDIR */ 109 NFS_DEFAULT_TIMER, /* SYMLINK */ 110 NFS_DEFAULT_TIMER, /* MKNOD */ 111 NFS_DEFAULT_TIMER, /* REMOVE */ 112 NFS_DEFAULT_TIMER, /* RMDIR */ 113 NFS_DEFAULT_TIMER, /* RENAME */ 114 NFS_DEFAULT_TIMER, /* LINK */ 115 NFS_READ_TIMER, /* READDIR */ 116 NFS_READ_TIMER, /* READDIRPLUS */ 117 NFS_DEFAULT_TIMER, /* FSSTAT */ 118 NFS_DEFAULT_TIMER, /* FSINFO */ 119 NFS_DEFAULT_TIMER, /* PATHCONF */ 120 NFS_DEFAULT_TIMER, /* COMMIT */ 121 NFS_DEFAULT_TIMER, /* NOOP */ 122 }; 123 124 void nfs_init_rtt(struct nfsmount *); 125 void nfs_update_rtt(struct nfsreq *); 126 int nfs_estimate_rto(struct nfsmount *, u_int32_t procnum); 127 128 void nfs_realign(struct mbuf **, int); 129 void nfs_realign_fixup(struct mbuf *, struct mbuf *, unsigned int *); 130 131 int nfs_rcvlock(struct nfsreq *); 132 int nfs_receive(struct nfsreq *, struct mbuf **, struct mbuf **); 133 int nfs_reconnect(struct nfsreq *); 134 int nfs_reply(struct nfsreq *); 135 void nfs_msg(struct nfsreq *, char *); 136 void nfs_rcvunlock(int *); 137 138 int nfsrv_getstream(struct nfssvc_sock *, int); 139 140 unsigned int nfs_realign_test = 0; 141 unsigned int nfs_realign_count = 0; 142 143 /* Initialize the RTT estimator state for a new mount point. */ 144 void 145 nfs_init_rtt(struct nfsmount *nmp) 146 { 147 int i; 148 149 for (i = 0; i < NFS_MAX_TIMER; i++) 150 nmp->nm_srtt[i] = NFS_INITRTT; 151 for (i = 0; i < NFS_MAX_TIMER; i++) 152 nmp->nm_sdrtt[i] = 0; 153 } 154 155 /* 156 * Update a mount point's RTT estimator state using data from the 157 * passed-in request. 158 * 159 * Use a gain of 0.125 on the mean and a gain of 0.25 on the deviation. 160 * 161 * NB: Since the timer resolution of NFS_HZ is so coarse, it can often 162 * result in r_rtt == 0. Since r_rtt == N means that the actual RTT is 163 * between N + dt and N + 2 - dt ticks, add 1 before calculating the 164 * update values. 165 */ 166 void 167 nfs_update_rtt(struct nfsreq *rep) 168 { 169 int t1 = rep->r_rtt + 1; 170 int index = nfs_ptimers[rep->r_procnum] - 1; 171 int *srtt = &rep->r_nmp->nm_srtt[index]; 172 int *sdrtt = &rep->r_nmp->nm_sdrtt[index]; 173 174 t1 -= *srtt >> 3; 175 *srtt += t1; 176 if (t1 < 0) 177 t1 = -t1; 178 t1 -= *sdrtt >> 2; 179 *sdrtt += t1; 180 } 181 182 /* 183 * Estimate RTO for an NFS RPC sent via an unreliable datagram. 184 * 185 * Use the mean and mean deviation of RTT for the appropriate type 186 * of RPC for the frequent RPCs and a default for the others. 187 * The justification for doing "other" this way is that these RPCs 188 * happen so infrequently that timer est. would probably be stale. 189 * Also, since many of these RPCs are non-idempotent, a conservative 190 * timeout is desired. 191 * 192 * getattr, lookup - A+2D 193 * read, write - A+4D 194 * other - nm_timeo 195 */ 196 int 197 nfs_estimate_rto(struct nfsmount *nmp, u_int32_t procnum) 198 { 199 enum nfs_rto_timers timer = nfs_ptimers[procnum]; 200 int index = timer - 1; 201 int rto; 202 203 switch (timer) { 204 case NFS_GETATTR_TIMER: 205 case NFS_LOOKUP_TIMER: 206 rto = ((nmp->nm_srtt[index] + 3) >> 2) + 207 ((nmp->nm_sdrtt[index] + 1) >> 1); 208 break; 209 case NFS_READ_TIMER: 210 case NFS_WRITE_TIMER: 211 rto = ((nmp->nm_srtt[index] + 7) >> 3) + 212 (nmp->nm_sdrtt[index] + 1); 213 break; 214 default: 215 rto = nmp->nm_timeo; 216 return (rto); 217 } 218 219 if (rto < NFS_MINRTO) 220 rto = NFS_MINRTO; 221 else if (rto > NFS_MAXRTO) 222 rto = NFS_MAXRTO; 223 224 return (rto); 225 } 226 227 228 229 /* 230 * Initialize sockets and congestion for a new NFS connection. 231 * We do not free the sockaddr if error. 232 */ 233 int 234 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep) 235 { 236 struct socket *so; 237 int error, rcvreserve, sndreserve; 238 struct sockaddr *saddr; 239 struct sockaddr_in *sin; 240 struct mbuf *nam = NULL, *mopt = NULL; 241 242 if (!(nmp->nm_sotype == SOCK_DGRAM || nmp->nm_sotype == SOCK_STREAM)) 243 return (EINVAL); 244 245 nmp->nm_so = NULL; 246 saddr = mtod(nmp->nm_nam, struct sockaddr *); 247 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 248 nmp->nm_soproto); 249 if (error) { 250 nfs_disconnect(nmp); 251 return (error); 252 } 253 254 /* Allocate mbufs possibly waiting before grabbing the socket lock. */ 255 if (nmp->nm_sotype == SOCK_STREAM || saddr->sa_family == AF_INET) 256 MGET(mopt, M_WAIT, MT_SOOPTS); 257 if (saddr->sa_family == AF_INET) 258 MGET(nam, M_WAIT, MT_SONAME); 259 260 so = nmp->nm_so; 261 nmp->nm_soflags = so->so_proto->pr_flags; 262 263 /* 264 * Some servers require that the client port be a reserved port number. 265 * We always allocate a reserved port, as this prevents filehandle 266 * disclosure through UDP port capture. 267 */ 268 if (saddr->sa_family == AF_INET) { 269 int *ip; 270 271 mopt->m_len = sizeof(int); 272 ip = mtod(mopt, int *); 273 *ip = IP_PORTRANGE_LOW; 274 error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt); 275 if (error) 276 goto bad; 277 278 sin = mtod(nam, struct sockaddr_in *); 279 memset(sin, 0, sizeof(*sin)); 280 sin->sin_len = nam->m_len = sizeof(struct sockaddr_in); 281 sin->sin_family = AF_INET; 282 sin->sin_addr.s_addr = INADDR_ANY; 283 sin->sin_port = htons(0); 284 solock(so); 285 error = sobind(so, nam, &proc0); 286 sounlock(so); 287 if (error) 288 goto bad; 289 290 mopt->m_len = sizeof(int); 291 ip = mtod(mopt, int *); 292 *ip = IP_PORTRANGE_DEFAULT; 293 error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, mopt); 294 if (error) 295 goto bad; 296 } 297 298 /* 299 * Protocols that do not require connections may be optionally left 300 * unconnected for servers that reply from a port other than NFS_PORT. 301 */ 302 if (nmp->nm_flag & NFSMNT_NOCONN) { 303 if (nmp->nm_soflags & PR_CONNREQUIRED) { 304 error = ENOTCONN; 305 goto bad; 306 } 307 } else { 308 solock(so); 309 error = soconnect(so, nmp->nm_nam); 310 if (error) 311 goto bad_locked; 312 313 /* 314 * Wait for the connection to complete. Cribbed from the 315 * connect system call but with the wait timing out so 316 * that interruptible mounts don't hang here for a long time. 317 */ 318 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 319 sosleep_nsec(so, &so->so_timeo, PSOCK, "nfscon", 320 SEC_TO_NSEC(2)); 321 if ((so->so_state & SS_ISCONNECTING) && 322 so->so_error == 0 && rep && 323 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 324 so->so_state &= ~SS_ISCONNECTING; 325 goto bad_locked; 326 } 327 } 328 if (so->so_error) { 329 error = so->so_error; 330 so->so_error = 0; 331 goto bad_locked; 332 } 333 sounlock(so); 334 } 335 /* 336 * Always set receive timeout to detect server crash and reconnect. 337 * Otherwise, we can get stuck in soreceive forever. 338 */ 339 mtx_enter(&so->so_rcv.sb_mtx); 340 so->so_rcv.sb_timeo_nsecs = SEC_TO_NSEC(5); 341 mtx_leave(&so->so_rcv.sb_mtx); 342 mtx_enter(&so->so_snd.sb_mtx); 343 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) 344 so->so_snd.sb_timeo_nsecs = SEC_TO_NSEC(5); 345 else 346 so->so_snd.sb_timeo_nsecs = INFSLP; 347 mtx_leave(&so->so_snd.sb_mtx); 348 if (nmp->nm_sotype == SOCK_DGRAM) { 349 sndreserve = nmp->nm_wsize + NFS_MAXPKTHDR; 350 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 351 NFS_MAXPKTHDR) * 2; 352 } else if (nmp->nm_sotype == SOCK_STREAM) { 353 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 354 *mtod(mopt, int32_t *) = 1; 355 mopt->m_len = sizeof(int32_t); 356 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, mopt); 357 } 358 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 359 *mtod(mopt, int32_t *) = 1; 360 mopt->m_len = sizeof(int32_t); 361 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, mopt); 362 } 363 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 364 sizeof (u_int32_t)) * 2; 365 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 366 sizeof (u_int32_t)) * 2; 367 } else { 368 panic("%s: nm_sotype %d", __func__, nmp->nm_sotype); 369 } 370 solock(so); 371 error = soreserve(so, sndreserve, rcvreserve); 372 if (error) 373 goto bad_locked; 374 mtx_enter(&so->so_rcv.sb_mtx); 375 so->so_rcv.sb_flags |= SB_NOINTR; 376 mtx_leave(&so->so_rcv.sb_mtx); 377 mtx_enter(&so->so_snd.sb_mtx); 378 so->so_snd.sb_flags |= SB_NOINTR; 379 mtx_leave(&so->so_snd.sb_mtx); 380 sounlock(so); 381 382 m_freem(mopt); 383 m_freem(nam); 384 385 /* Initialize other non-zero congestion variables */ 386 nfs_init_rtt(nmp); 387 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 388 nmp->nm_sent = 0; 389 nmp->nm_timeouts = 0; 390 return (0); 391 392 bad_locked: 393 sounlock(so); 394 bad: 395 396 m_freem(mopt); 397 m_freem(nam); 398 399 nfs_disconnect(nmp); 400 return (error); 401 } 402 403 /* 404 * Reconnect routine: 405 * Called when a connection is broken on a reliable protocol. 406 * - clean up the old socket 407 * - nfs_connect() again 408 * - set R_MUSTRESEND for all outstanding requests on mount point 409 * If this fails the mount point is DEAD! 410 * nb: Must be called with the nfs_sndlock() set on the mount point. 411 */ 412 int 413 nfs_reconnect(struct nfsreq *rep) 414 { 415 struct nfsreq *rp; 416 struct nfsmount *nmp = rep->r_nmp; 417 int error; 418 419 nfs_disconnect(nmp); 420 while ((error = nfs_connect(nmp, rep)) != 0) { 421 if (error == EINTR || error == ERESTART) 422 return (EINTR); 423 tsleep_nsec(&nowake, PSOCK, "nfsrecon", SEC_TO_NSEC(1)); 424 } 425 426 /* 427 * Loop through outstanding request list and fix up all requests 428 * on old socket. 429 */ 430 TAILQ_FOREACH(rp, &nmp->nm_reqsq, r_chain) { 431 rp->r_flags |= R_MUSTRESEND; 432 rp->r_rexmit = 0; 433 } 434 return (0); 435 } 436 437 /* 438 * NFS disconnect. Clean up and unlink. 439 */ 440 void 441 nfs_disconnect(struct nfsmount *nmp) 442 { 443 struct socket *so; 444 445 if (nmp->nm_so) { 446 so = nmp->nm_so; 447 nmp->nm_so = NULL; 448 soshutdown(so, SHUT_RDWR); 449 soclose(so, 0); 450 } 451 } 452 453 /* 454 * This is the nfs send routine. For connection based socket types, it 455 * must be called with an nfs_sndlock() on the socket. 456 * "rep == NULL" indicates that it has been called from a server. 457 * For the client side: 458 * - return EINTR if the RPC is terminated, 0 otherwise 459 * - set R_MUSTRESEND if the send fails for any reason 460 * - do any cleanup required by recoverable socket errors (???) 461 * For the server side: 462 * - return EINTR or ERESTART if interrupted by a signal 463 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 464 * - do any cleanup required by recoverable socket errors (???) 465 */ 466 int 467 nfs_send(struct socket *so, struct mbuf *nam, struct mbuf *top, 468 struct nfsreq *rep) 469 { 470 struct mbuf *sendnam; 471 int error, soflags, flags; 472 473 if (rep) { 474 if (rep->r_flags & R_SOFTTERM) { 475 m_freem(top); 476 return (EINTR); 477 } 478 if ((so = rep->r_nmp->nm_so) == NULL) { 479 rep->r_flags |= R_MUSTRESEND; 480 m_freem(top); 481 return (0); 482 } 483 rep->r_flags &= ~R_MUSTRESEND; 484 soflags = rep->r_nmp->nm_soflags; 485 } else 486 soflags = so->so_proto->pr_flags; 487 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 488 sendnam = NULL; 489 else 490 sendnam = nam; 491 flags = 0; 492 493 error = sosend(so, sendnam, NULL, top, NULL, flags); 494 if (error) { 495 if (rep) { 496 /* 497 * Deal with errors for the client side. 498 */ 499 if (rep->r_flags & R_SOFTTERM) 500 error = EINTR; 501 else 502 rep->r_flags |= R_MUSTRESEND; 503 } 504 505 /* 506 * Handle any recoverable (soft) socket errors here. (???) 507 */ 508 if (error != EINTR && error != ERESTART && 509 error != EWOULDBLOCK && error != EPIPE) 510 error = 0; 511 } 512 return (error); 513 } 514 515 #ifdef NFSCLIENT 516 /* 517 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 518 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 519 * Mark and consolidate the data into a new mbuf list. 520 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 521 * small mbufs. 522 * For SOCK_STREAM we must be very careful to read an entire record once 523 * we have read any of it, even if the system call has been interrupted. 524 */ 525 int 526 nfs_receive(struct nfsreq *rep, struct mbuf **aname, struct mbuf **mp) 527 { 528 struct socket *so; 529 struct uio auio; 530 struct iovec aio; 531 struct mbuf *m; 532 struct mbuf *control; 533 u_int32_t len; 534 struct mbuf **getnam; 535 int error, sotype, rcvflg; 536 struct proc *p = curproc; /* XXX */ 537 538 /* 539 * Set up arguments for soreceive() 540 */ 541 *mp = NULL; 542 *aname = NULL; 543 sotype = rep->r_nmp->nm_sotype; 544 545 /* 546 * For reliable protocols, lock against other senders/receivers 547 * in case a reconnect is necessary. 548 * For SOCK_STREAM, first get the Record Mark to find out how much 549 * more there is to get. 550 * We must lock the socket against other receivers 551 * until we have an entire rpc request/reply. 552 */ 553 if (sotype != SOCK_DGRAM) { 554 error = nfs_sndlock(&rep->r_nmp->nm_flag, rep); 555 if (error) 556 return (error); 557 tryagain: 558 /* 559 * Check for fatal errors and resending request. 560 */ 561 /* 562 * Ugh: If a reconnect attempt just happened, nm_so 563 * would have changed. NULL indicates a failed 564 * attempt that has essentially shut down this 565 * mount point. 566 */ 567 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 568 nfs_sndunlock(&rep->r_nmp->nm_flag); 569 return (EINTR); 570 } 571 so = rep->r_nmp->nm_so; 572 if (!so) { 573 error = nfs_reconnect(rep); 574 if (error) { 575 nfs_sndunlock(&rep->r_nmp->nm_flag); 576 return (error); 577 } 578 goto tryagain; 579 } 580 while (rep->r_flags & R_MUSTRESEND) { 581 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 582 nfsstats.rpcretries++; 583 rep->r_rtt = 0; 584 rep->r_flags &= ~R_TIMING; 585 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 586 if (error) { 587 if (error == EINTR || error == ERESTART || 588 (error = nfs_reconnect(rep)) != 0) { 589 nfs_sndunlock(&rep->r_nmp->nm_flag); 590 return (error); 591 } 592 goto tryagain; 593 } 594 } 595 nfs_sndunlock(&rep->r_nmp->nm_flag); 596 if (sotype == SOCK_STREAM) { 597 aio.iov_base = (caddr_t) &len; 598 aio.iov_len = sizeof(u_int32_t); 599 auio.uio_iov = &aio; 600 auio.uio_iovcnt = 1; 601 auio.uio_segflg = UIO_SYSSPACE; 602 auio.uio_rw = UIO_READ; 603 auio.uio_offset = 0; 604 auio.uio_resid = sizeof(u_int32_t); 605 auio.uio_procp = p; 606 do { 607 rcvflg = MSG_WAITALL; 608 error = soreceive(so, NULL, &auio, NULL, NULL, 609 &rcvflg, 0); 610 if (error == EWOULDBLOCK && rep) { 611 if (rep->r_flags & R_SOFTTERM) 612 return (EINTR); 613 /* 614 * looks like the server died after it 615 * received the request, make sure 616 * that we will retransmit and we 617 * don't get stuck here forever. 618 */ 619 if (rep->r_rexmit >= 620 rep->r_nmp->nm_retry) { 621 nfsstats.rpctimeouts++; 622 error = EPIPE; 623 } 624 } 625 } while (error == EWOULDBLOCK); 626 if (!error && auio.uio_resid > 0) { 627 log(LOG_INFO, 628 "short receive (%zu/%zu) from nfs server %s\n", 629 sizeof(u_int32_t) - auio.uio_resid, 630 sizeof(u_int32_t), 631 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 632 error = EPIPE; 633 } 634 if (error) 635 goto errout; 636 637 len = ntohl(len) & ~0x80000000; 638 /* 639 * This is SERIOUS! We are out of sync with the sender 640 * and forcing a disconnect/reconnect is all I can do. 641 */ 642 if (len > NFS_MAXPACKET) { 643 log(LOG_ERR, "%s (%u) from nfs server %s\n", 644 "impossible packet length", 645 len, 646 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 647 error = EFBIG; 648 goto errout; 649 } 650 auio.uio_resid = len; 651 do { 652 rcvflg = MSG_WAITALL; 653 error = soreceive(so, NULL, &auio, mp, NULL, 654 &rcvflg, 0); 655 } while (error == EWOULDBLOCK || error == EINTR || 656 error == ERESTART); 657 if (!error && auio.uio_resid > 0) { 658 log(LOG_INFO, "short receive (%zu/%u) from " 659 "nfs server %s\n", len - auio.uio_resid, 660 len, rep->r_nmp->nm_mountp-> 661 mnt_stat.f_mntfromname); 662 error = EPIPE; 663 } 664 } else { 665 /* 666 * NB: Since uio_resid is big, MSG_WAITALL is ignored 667 * and soreceive() will return when it has either a 668 * control msg or a data msg. 669 * We have no use for control msg., but must grab them 670 * and then throw them away so we know what is going 671 * on. 672 */ 673 auio.uio_resid = len = 100000000; /* Anything Big */ 674 auio.uio_procp = p; 675 do { 676 rcvflg = 0; 677 error = soreceive(so, NULL, &auio, mp, &control, 678 &rcvflg, 0); 679 m_freem(control); 680 if (error == EWOULDBLOCK && rep) { 681 if (rep->r_flags & R_SOFTTERM) 682 return (EINTR); 683 } 684 } while (error == EWOULDBLOCK || 685 (!error && *mp == NULL && control)); 686 if ((rcvflg & MSG_EOR) == 0) 687 printf("Egad!!\n"); 688 if (!error && *mp == NULL) 689 error = EPIPE; 690 len -= auio.uio_resid; 691 } 692 errout: 693 if (error && error != EINTR && error != ERESTART) { 694 m_freemp(mp); 695 if (error != EPIPE) 696 log(LOG_INFO, 697 "receive error %d from nfs server %s\n", 698 error, 699 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 700 error = nfs_sndlock(&rep->r_nmp->nm_flag, rep); 701 if (!error) { 702 error = nfs_reconnect(rep); 703 if (!error) 704 goto tryagain; 705 nfs_sndunlock(&rep->r_nmp->nm_flag); 706 } 707 } 708 } else { 709 if ((so = rep->r_nmp->nm_so) == NULL) 710 return (EACCES); 711 if (so->so_state & SS_ISCONNECTED) 712 getnam = NULL; 713 else 714 getnam = aname; 715 auio.uio_resid = len = 1000000; 716 auio.uio_procp = p; 717 do { 718 rcvflg = 0; 719 error = soreceive(so, getnam, &auio, mp, NULL, 720 &rcvflg, 0); 721 if (error == EWOULDBLOCK && 722 (rep->r_flags & R_SOFTTERM)) 723 return (EINTR); 724 } while (error == EWOULDBLOCK); 725 len -= auio.uio_resid; 726 } 727 if (error) 728 m_freemp(mp); 729 /* 730 * Search for any mbufs that are not a multiple of 4 bytes long 731 * or with m_data not longword aligned. 732 * These could cause pointer alignment problems, so copy them to 733 * well aligned mbufs. 734 */ 735 nfs_realign(mp, 5 * NFSX_UNSIGNED); 736 return (error); 737 } 738 739 /* 740 * Implement receipt of reply on a socket. 741 * We must search through the list of received datagrams matching them 742 * with outstanding requests using the xid, until ours is found. 743 */ 744 int 745 nfs_reply(struct nfsreq *myrep) 746 { 747 struct nfsreq *rep; 748 struct nfsmount *nmp = myrep->r_nmp; 749 struct nfsm_info info; 750 struct mbuf *nam; 751 u_int32_t rxid, *tl; 752 int error; 753 754 /* 755 * Loop around until we get our own reply 756 */ 757 for (;;) { 758 /* 759 * Lock against other receivers so that I don't get stuck in 760 * sbwait() after someone else has received my reply for me. 761 * Also necessary for connection based protocols to avoid 762 * race conditions during a reconnect. 763 */ 764 error = nfs_rcvlock(myrep); 765 if (error) 766 return (error == EALREADY ? 0 : error); 767 768 /* 769 * Get the next Rpc reply off the socket 770 */ 771 error = nfs_receive(myrep, &nam, &info.nmi_mrep); 772 nfs_rcvunlock(&nmp->nm_flag); 773 if (error) { 774 775 /* 776 * Ignore routing errors on connectionless protocols?? 777 */ 778 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 779 if (nmp->nm_so) 780 nmp->nm_so->so_error = 0; 781 continue; 782 } 783 return (error); 784 } 785 m_freem(nam); 786 787 /* 788 * Get the xid and check that it is an rpc reply 789 */ 790 info.nmi_md = info.nmi_mrep; 791 info.nmi_dpos = mtod(info.nmi_md, caddr_t); 792 info.nmi_errorp = &error; 793 tl = (uint32_t *)nfsm_dissect(&info, 2 * NFSX_UNSIGNED); 794 if (tl == NULL) 795 goto nfsmout; 796 rxid = *tl++; 797 if (*tl != rpc_reply) { 798 nfsstats.rpcinvalid++; 799 m_freem(info.nmi_mrep); 800 nfsmout: 801 continue; 802 } 803 804 /* 805 * Loop through the request list to match up the reply 806 * Iff no match, just drop the datagram 807 */ 808 TAILQ_FOREACH(rep, &nmp->nm_reqsq, r_chain) { 809 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 810 /* Found it.. */ 811 rep->r_mrep = info.nmi_mrep; 812 rep->r_md = info.nmi_md; 813 rep->r_dpos = info.nmi_dpos; 814 815 /* 816 * Update congestion window. 817 * Do the additive increase of 818 * one rpc/rtt. 819 */ 820 if (nmp->nm_cwnd <= nmp->nm_sent) { 821 nmp->nm_cwnd += 822 (NFS_CWNDSCALE * NFS_CWNDSCALE + 823 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 824 if (nmp->nm_cwnd > NFS_MAXCWND) 825 nmp->nm_cwnd = NFS_MAXCWND; 826 } 827 rep->r_flags &= ~R_SENT; 828 nmp->nm_sent -= NFS_CWNDSCALE; 829 830 if (rep->r_flags & R_TIMING) 831 nfs_update_rtt(rep); 832 833 nmp->nm_timeouts = 0; 834 break; 835 } 836 } 837 /* 838 * If not matched to a request, drop it. 839 * If it's mine, get out. 840 */ 841 if (rep == 0) { 842 nfsstats.rpcunexpected++; 843 m_freem(info.nmi_mrep); 844 } else if (rep == myrep) { 845 if (rep->r_mrep == NULL) 846 panic("nfsreply nil"); 847 return (0); 848 } 849 } 850 } 851 852 /* 853 * nfs_request - goes something like this 854 * - fill in request struct 855 * - links it into list 856 * - calls nfs_send() for first transmit 857 * - calls nfs_receive() to get reply 858 * - break down rpc header and return with nfs reply pointed to 859 * by mrep or error 860 * nb: always frees up mreq mbuf list 861 */ 862 int 863 nfs_request(struct vnode *vp, int procnum, struct nfsm_info *infop) 864 { 865 struct mbuf *m; 866 u_int32_t *tl; 867 struct nfsmount *nmp; 868 int i, error = 0; 869 int trylater_delay; 870 struct nfsreq *rep; 871 struct nfsm_info info; 872 873 rep = pool_get(&nfsreqpl, PR_WAITOK); 874 rep->r_nmp = VFSTONFS(vp->v_mount); 875 rep->r_vp = vp; 876 rep->r_procp = infop->nmi_procp; 877 rep->r_procnum = procnum; 878 879 /* empty mbuf for AUTH_UNIX header */ 880 rep->r_mreq = m_gethdr(M_WAIT, MT_DATA); 881 rep->r_mreq->m_next = infop->nmi_mreq; 882 rep->r_mreq->m_len = 0; 883 m_calchdrlen(rep->r_mreq); 884 885 trylater_delay = NFS_MINTIMEO; 886 887 nmp = rep->r_nmp; 888 889 /* Get the RPC header with authorization. */ 890 nfsm_rpchead(rep, infop->nmi_cred, RPCAUTH_UNIX); 891 m = rep->r_mreq; 892 893 /* 894 * For stream protocols, insert a Sun RPC Record Mark. 895 */ 896 if (nmp->nm_sotype == SOCK_STREAM) { 897 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 898 *mtod(m, u_int32_t *) = htonl(0x80000000 | 899 (m->m_pkthdr.len - NFSX_UNSIGNED)); 900 } 901 902 tryagain: 903 rep->r_rtt = rep->r_rexmit = 0; 904 if (nfs_ptimers[rep->r_procnum] != NFS_DEFAULT_TIMER) 905 rep->r_flags = R_TIMING; 906 else 907 rep->r_flags = 0; 908 rep->r_mrep = NULL; 909 910 /* 911 * Do the client side RPC. 912 */ 913 nfsstats.rpcrequests++; 914 /* 915 * Chain request into list of outstanding requests. Be sure 916 * to put it LAST so timer finds oldest requests first. 917 */ 918 if (TAILQ_EMPTY(&nmp->nm_reqsq)) 919 timeout_add(&nmp->nm_rtimeout, nfs_ticks); 920 TAILQ_INSERT_TAIL(&nmp->nm_reqsq, rep, r_chain); 921 922 /* 923 * If backing off another request or avoiding congestion, don't 924 * send this one now but let timer do it. If not timing a request, 925 * do it now. 926 */ 927 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 928 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 929 nmp->nm_sent < nmp->nm_cwnd)) { 930 if (nmp->nm_soflags & PR_CONNREQUIRED) 931 error = nfs_sndlock(&nmp->nm_flag, rep); 932 if (!error) { 933 error = nfs_send(nmp->nm_so, nmp->nm_nam, 934 m_copym(m, 0, M_COPYALL, M_WAIT), rep); 935 if (nmp->nm_soflags & PR_CONNREQUIRED) 936 nfs_sndunlock(&nmp->nm_flag); 937 } 938 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 939 nmp->nm_sent += NFS_CWNDSCALE; 940 rep->r_flags |= R_SENT; 941 } 942 } else { 943 rep->r_rtt = -1; 944 } 945 946 /* 947 * Wait for the reply from our send or the timer's. 948 */ 949 if (!error || error == EPIPE) 950 error = nfs_reply(rep); 951 952 /* 953 * RPC done, unlink the request. 954 */ 955 TAILQ_REMOVE(&nmp->nm_reqsq, rep, r_chain); 956 if (TAILQ_EMPTY(&nmp->nm_reqsq)) 957 timeout_del(&nmp->nm_rtimeout); 958 959 /* 960 * Decrement the outstanding request count. 961 */ 962 if (rep->r_flags & R_SENT) { 963 rep->r_flags &= ~R_SENT; /* paranoia */ 964 nmp->nm_sent -= NFS_CWNDSCALE; 965 } 966 967 /* 968 * If there was a successful reply and a tprintf msg. 969 * tprintf a response. 970 */ 971 if (!error && (rep->r_flags & R_TPRINTFMSG)) 972 nfs_msg(rep, "is alive again"); 973 info.nmi_mrep = rep->r_mrep; 974 info.nmi_md = rep->r_md; 975 info.nmi_dpos = rep->r_dpos; 976 info.nmi_errorp = &error; 977 if (error) { 978 infop->nmi_mrep = NULL; 979 goto nfsmout1; 980 } 981 982 /* 983 * break down the rpc header and check if ok 984 */ 985 tl = (uint32_t *)nfsm_dissect(&info, 3 * NFSX_UNSIGNED); 986 if (tl == NULL) 987 goto nfsmout; 988 if (*tl++ == rpc_msgdenied) { 989 if (*tl == rpc_mismatch) 990 error = EOPNOTSUPP; 991 else 992 error = EACCES; /* Should be EAUTH. */ 993 infop->nmi_mrep = NULL; 994 goto nfsmout1; 995 } 996 997 /* 998 * Since we only support RPCAUTH_UNIX atm we step over the 999 * reply verifier type, and in the (error) case that there really 1000 * is any data in it, we advance over it. 1001 */ 1002 tl++; /* Step over verifier type */ 1003 i = fxdr_unsigned(int32_t, *tl); 1004 if (i > 0) { 1005 /* Should not happen */ 1006 if (nfsm_adv(&info, nfsm_rndup(i)) != 0) 1007 goto nfsmout; 1008 } 1009 1010 tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED); 1011 if (tl == NULL) 1012 goto nfsmout; 1013 /* 0 == ok */ 1014 if (*tl == 0) { 1015 tl = (uint32_t *)nfsm_dissect(&info, NFSX_UNSIGNED); 1016 if (tl == NULL) 1017 goto nfsmout; 1018 if (*tl != 0) { 1019 error = fxdr_unsigned(int, *tl); 1020 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1021 error == NFSERR_TRYLATER) { 1022 m_freem(info.nmi_mrep); 1023 info.nmi_mrep = NULL; 1024 error = 0; 1025 tsleep_nsec(&nowake, PSOCK, "nfsretry", 1026 SEC_TO_NSEC(trylater_delay)); 1027 trylater_delay *= NFS_TIMEOUTMUL; 1028 if (trylater_delay > NFS_MAXTIMEO) 1029 trylater_delay = NFS_MAXTIMEO; 1030 1031 goto tryagain; 1032 } 1033 1034 /* 1035 * If the File Handle was stale, invalidate the 1036 * lookup cache, just in case. 1037 */ 1038 if (error == ESTALE) 1039 cache_purge(rep->r_vp); 1040 } 1041 goto nfsmout; 1042 } 1043 1044 error = EPROTONOSUPPORT; 1045 1046 nfsmout: 1047 infop->nmi_mrep = info.nmi_mrep; 1048 infop->nmi_md = info.nmi_md; 1049 infop->nmi_dpos = info.nmi_dpos; 1050 nfsmout1: 1051 m_freem(rep->r_mreq); 1052 pool_put(&nfsreqpl, rep); 1053 return (error); 1054 } 1055 #endif /* NFSCLIENT */ 1056 1057 /* 1058 * Generate the rpc reply header 1059 * siz arg. is used to decide if adding a cluster is worthwhile 1060 */ 1061 int 1062 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, 1063 int err, struct mbuf **mrq, struct mbuf **mbp) 1064 { 1065 u_int32_t *tl; 1066 struct mbuf *mreq; 1067 struct mbuf *mb; 1068 1069 MGETHDR(mreq, M_WAIT, MT_DATA); 1070 mb = mreq; 1071 /* 1072 * If this is a big reply, use a cluster else 1073 * try and leave leading space for the lower level headers. 1074 */ 1075 siz += RPC_REPLYSIZ; 1076 if (siz >= MHLEN - max_hdr) { 1077 MCLGET(mreq, M_WAIT); 1078 } else 1079 mreq->m_data += max_hdr; 1080 tl = mtod(mreq, u_int32_t *); 1081 mreq->m_len = 6 * NFSX_UNSIGNED; 1082 *tl++ = txdr_unsigned(nd->nd_retxid); 1083 *tl++ = rpc_reply; 1084 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1085 *tl++ = rpc_msgdenied; 1086 if (err & NFSERR_AUTHERR) { 1087 *tl++ = rpc_autherr; 1088 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1089 mreq->m_len -= NFSX_UNSIGNED; 1090 } else { 1091 *tl++ = rpc_mismatch; 1092 *tl++ = txdr_unsigned(RPC_VER2); 1093 *tl = txdr_unsigned(RPC_VER2); 1094 } 1095 } else { 1096 *tl++ = rpc_msgaccepted; 1097 1098 /* AUTH_UNIX requires RPCAUTH_NULL. */ 1099 *tl++ = 0; 1100 *tl++ = 0; 1101 1102 switch (err) { 1103 case EPROGUNAVAIL: 1104 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1105 break; 1106 case EPROGMISMATCH: 1107 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1108 tl = nfsm_build(&mb, 2 * NFSX_UNSIGNED); 1109 *tl++ = txdr_unsigned(NFS_VER2); 1110 *tl = txdr_unsigned(NFS_VER3); 1111 break; 1112 case EPROCUNAVAIL: 1113 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1114 break; 1115 case EBADRPC: 1116 *tl = txdr_unsigned(RPC_GARBAGE); 1117 break; 1118 default: 1119 *tl = 0; 1120 if (err != NFSERR_RETVOID) { 1121 tl = nfsm_build(&mb, NFSX_UNSIGNED); 1122 if (err) 1123 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1124 else 1125 *tl = 0; 1126 } 1127 break; 1128 } 1129 } 1130 1131 *mrq = mreq; 1132 if (mbp != NULL) 1133 *mbp = mb; 1134 if (err != 0 && err != NFSERR_RETVOID) 1135 nfsstats.srvrpc_errs++; 1136 return (0); 1137 } 1138 1139 /* 1140 * nfs timer routine 1141 * Scan the nfsreq list and retransmit any requests that have timed out. 1142 */ 1143 void 1144 nfs_timer(void *arg) 1145 { 1146 struct nfsmount *nmp = arg; 1147 struct nfsreq *rep; 1148 struct mbuf *m; 1149 struct socket *so; 1150 int timeo, error; 1151 1152 NET_LOCK(); 1153 TAILQ_FOREACH(rep, &nmp->nm_reqsq, r_chain) { 1154 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1155 continue; 1156 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1157 rep->r_flags |= R_SOFTTERM; 1158 continue; 1159 } 1160 if (rep->r_rtt >= 0) { 1161 rep->r_rtt++; 1162 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1163 timeo = nmp->nm_timeo; 1164 else 1165 timeo = nfs_estimate_rto(nmp, rep->r_procnum); 1166 if (nmp->nm_timeouts > 0) 1167 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1168 if (rep->r_rtt <= timeo) 1169 continue; 1170 if (nmp->nm_timeouts < nitems(nfs_backoff)) 1171 nmp->nm_timeouts++; 1172 } 1173 1174 /* Check for server not responding. */ 1175 if ((rep->r_flags & R_TPRINTFMSG) == 0 && rep->r_rexmit > 4) { 1176 nfs_msg(rep, "not responding"); 1177 rep->r_flags |= R_TPRINTFMSG; 1178 } 1179 if (rep->r_rexmit >= nmp->nm_retry) { /* too many */ 1180 nfsstats.rpctimeouts++; 1181 rep->r_flags |= R_SOFTTERM; 1182 continue; 1183 } 1184 if (nmp->nm_sotype != SOCK_DGRAM) { 1185 if (++rep->r_rexmit > NFS_MAXREXMIT) 1186 rep->r_rexmit = NFS_MAXREXMIT; 1187 continue; 1188 } 1189 1190 if ((so = nmp->nm_so) == NULL) 1191 continue; 1192 1193 /* 1194 * If there is enough space and the window allows.. 1195 * Resend it 1196 * Set r_rtt to -1 in case we fail to send it now. 1197 */ 1198 rep->r_rtt = -1; 1199 if (sbspace(so, &so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1200 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1201 (rep->r_flags & R_SENT) || 1202 nmp->nm_sent < nmp->nm_cwnd) && 1203 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1204 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1205 error = pru_send(so, m, NULL, NULL); 1206 else 1207 error = pru_send(so, m, nmp->nm_nam, NULL); 1208 if (error) { 1209 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1210 so->so_error = 0; 1211 } else { 1212 /* 1213 * Iff first send, start timing 1214 * else turn timing off, backoff timer 1215 * and divide congestion window by 2. 1216 */ 1217 if (rep->r_flags & R_SENT) { 1218 rep->r_flags &= ~R_TIMING; 1219 if (++rep->r_rexmit > NFS_MAXREXMIT) 1220 rep->r_rexmit = NFS_MAXREXMIT; 1221 nmp->nm_cwnd >>= 1; 1222 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1223 nmp->nm_cwnd = NFS_CWNDSCALE; 1224 nfsstats.rpcretries++; 1225 } else { 1226 rep->r_flags |= R_SENT; 1227 nmp->nm_sent += NFS_CWNDSCALE; 1228 } 1229 rep->r_rtt = 0; 1230 } 1231 } 1232 } 1233 NET_UNLOCK(); 1234 timeout_add(&nmp->nm_rtimeout, nfs_ticks); 1235 } 1236 1237 /* 1238 * Test for a termination condition pending on the process. 1239 * This is used for NFSMNT_INT mounts. 1240 */ 1241 int 1242 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct proc *p) 1243 { 1244 1245 if (rep && (rep->r_flags & R_SOFTTERM)) 1246 return (EINTR); 1247 if (!(nmp->nm_flag & NFSMNT_INT)) 1248 return (0); 1249 if (p && (SIGPENDING(p) & ~p->p_p->ps_sigacts->ps_sigignore & 1250 NFSINT_SIGMASK)) 1251 return (EINTR); 1252 return (0); 1253 } 1254 1255 /* 1256 * Lock a socket against others. 1257 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1258 * and also to avoid race conditions between the processes with nfs requests 1259 * in progress when a reconnect is necessary. 1260 */ 1261 int 1262 nfs_sndlock(int *flagp, struct nfsreq *rep) 1263 { 1264 uint64_t slptimeo = INFSLP; 1265 struct proc *p; 1266 int slpflag = 0; 1267 1268 if (rep) { 1269 p = rep->r_procp; 1270 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1271 slpflag = PCATCH; 1272 } else 1273 p = NULL; 1274 while (*flagp & NFSMNT_SNDLOCK) { 1275 if (rep && nfs_sigintr(rep->r_nmp, rep, p)) 1276 return (EINTR); 1277 *flagp |= NFSMNT_WANTSND; 1278 tsleep_nsec(flagp, slpflag | (PZERO - 1), "nfsndlck", slptimeo); 1279 if (slpflag == PCATCH) { 1280 slpflag = 0; 1281 slptimeo = SEC_TO_NSEC(2); 1282 } 1283 } 1284 *flagp |= NFSMNT_SNDLOCK; 1285 return (0); 1286 } 1287 1288 /* 1289 * Unlock the stream socket for others. 1290 */ 1291 void 1292 nfs_sndunlock(int *flagp) 1293 { 1294 1295 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1296 panic("nfs sndunlock"); 1297 *flagp &= ~NFSMNT_SNDLOCK; 1298 if (*flagp & NFSMNT_WANTSND) { 1299 *flagp &= ~NFSMNT_WANTSND; 1300 wakeup((caddr_t)flagp); 1301 } 1302 } 1303 1304 int 1305 nfs_rcvlock(struct nfsreq *rep) 1306 { 1307 uint64_t slptimeo = INFSLP; 1308 int *flagp = &rep->r_nmp->nm_flag; 1309 int slpflag; 1310 1311 if (*flagp & NFSMNT_INT) 1312 slpflag = PCATCH; 1313 else 1314 slpflag = 0; 1315 1316 while (*flagp & NFSMNT_RCVLOCK) { 1317 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1318 return (EINTR); 1319 *flagp |= NFSMNT_WANTRCV; 1320 tsleep_nsec(flagp, slpflag | (PZERO - 1), "nfsrcvlk", slptimeo); 1321 if (rep->r_mrep != NULL) { 1322 /* 1323 * Don't take the lock if our reply has been received 1324 * while we where sleeping. 1325 */ 1326 return (EALREADY); 1327 } 1328 if (slpflag == PCATCH) { 1329 slpflag = 0; 1330 slptimeo = SEC_TO_NSEC(2); 1331 } 1332 } 1333 *flagp |= NFSMNT_RCVLOCK; 1334 return (0); 1335 } 1336 1337 /* 1338 * Unlock the stream socket for others. 1339 */ 1340 void 1341 nfs_rcvunlock(int *flagp) 1342 { 1343 1344 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1345 panic("nfs rcvunlock"); 1346 *flagp &= ~NFSMNT_RCVLOCK; 1347 if (*flagp & NFSMNT_WANTRCV) { 1348 *flagp &= ~NFSMNT_WANTRCV; 1349 wakeup(flagp); 1350 } 1351 } 1352 1353 /* 1354 * Auxiliary routine to align the length of mbuf copies made with m_copyback(). 1355 */ 1356 void 1357 nfs_realign_fixup(struct mbuf *m, struct mbuf *n, unsigned int *off) 1358 { 1359 size_t padding; 1360 1361 /* 1362 * The maximum number of bytes that m_copyback() places in a mbuf is 1363 * always an aligned quantity, so realign happens at the chain's tail. 1364 */ 1365 while (n->m_next != NULL) 1366 n = n->m_next; 1367 1368 /* 1369 * Pad from the next elements in the source chain. Loop until the 1370 * destination chain is aligned, or the end of the source is reached. 1371 */ 1372 do { 1373 m = m->m_next; 1374 if (m == NULL) 1375 return; 1376 1377 padding = min(ALIGN(n->m_len) - n->m_len, m->m_len); 1378 if (padding > m_trailingspace(n)) 1379 panic("nfs_realign_fixup: no memory to pad to"); 1380 1381 bcopy(mtod(m, void *), mtod(n, char *) + n->m_len, padding); 1382 1383 n->m_len += padding; 1384 m_adj(m, padding); 1385 *off += padding; 1386 1387 } while (!ALIGNED_POINTER(n->m_len, void *)); 1388 } 1389 1390 /* 1391 * The NFS RPC parsing code uses the data address and the length of mbuf 1392 * structures to calculate on-memory addresses. This function makes sure these 1393 * parameters are correctly aligned. 1394 */ 1395 void 1396 nfs_realign(struct mbuf **pm, int hsiz) 1397 { 1398 struct mbuf *m; 1399 struct mbuf *n = NULL; 1400 unsigned int off = 0; 1401 1402 ++nfs_realign_test; 1403 while ((m = *pm) != NULL) { 1404 if (!ALIGNED_POINTER(m->m_data, void *) || 1405 !ALIGNED_POINTER(m->m_len, void *)) { 1406 MGET(n, M_WAIT, MT_DATA); 1407 #define ALIGN_POINTER(n) ((u_int)(((n) + sizeof(void *)) & ~sizeof(void *))) 1408 if (ALIGN_POINTER(m->m_len) >= MINCLSIZE) { 1409 MCLGET(n, M_WAIT); 1410 } 1411 n->m_len = 0; 1412 break; 1413 } 1414 pm = &m->m_next; 1415 } 1416 /* 1417 * If n is non-NULL, loop on m copying data, then replace the 1418 * portion of the chain that had to be realigned. 1419 */ 1420 if (n != NULL) { 1421 ++nfs_realign_count; 1422 while (m) { 1423 m_copyback(n, off, m->m_len, mtod(m, caddr_t), M_WAIT); 1424 1425 /* 1426 * If an unaligned amount of memory was copied, fix up 1427 * the last mbuf created by m_copyback(). 1428 */ 1429 if (!ALIGNED_POINTER(m->m_len, void *)) 1430 nfs_realign_fixup(m, n, &off); 1431 1432 off += m->m_len; 1433 m = m->m_next; 1434 } 1435 m_freemp(pm); 1436 *pm = n; 1437 } 1438 } 1439 1440 1441 /* 1442 * Parse an RPC request 1443 * - verify it 1444 * - fill in the cred struct. 1445 */ 1446 int 1447 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 1448 { 1449 int len, i; 1450 u_int32_t *tl; 1451 u_int32_t nfsvers, auth_type; 1452 int error = 0; 1453 struct nfsm_info info; 1454 1455 info.nmi_mrep = nd->nd_mrep; 1456 info.nmi_md = nd->nd_md; 1457 info.nmi_dpos = nd->nd_dpos; 1458 info.nmi_errorp = &error; 1459 if (has_header) { 1460 tl = (uint32_t *)nfsm_dissect(&info, 10 * NFSX_UNSIGNED); 1461 if (tl == NULL) 1462 goto nfsmout; 1463 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1464 if (*tl++ != rpc_call) { 1465 m_freem(info.nmi_mrep); 1466 return (EBADRPC); 1467 } 1468 } else { 1469 tl = (uint32_t *)nfsm_dissect(&info, 8 * NFSX_UNSIGNED); 1470 if (tl == NULL) 1471 goto nfsmout; 1472 } 1473 nd->nd_repstat = 0; 1474 nd->nd_flag = 0; 1475 if (*tl++ != rpc_vers) { 1476 nd->nd_repstat = ERPCMISMATCH; 1477 nd->nd_procnum = NFSPROC_NOOP; 1478 return (0); 1479 } 1480 if (*tl != nfs_prog) { 1481 nd->nd_repstat = EPROGUNAVAIL; 1482 nd->nd_procnum = NFSPROC_NOOP; 1483 return (0); 1484 } 1485 tl++; 1486 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1487 if (nfsvers != NFS_VER2 && nfsvers != NFS_VER3) { 1488 nd->nd_repstat = EPROGMISMATCH; 1489 nd->nd_procnum = NFSPROC_NOOP; 1490 return (0); 1491 } 1492 if (nfsvers == NFS_VER3) 1493 nd->nd_flag = ND_NFSV3; 1494 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1495 if (nd->nd_procnum == NFSPROC_NULL) 1496 return (0); 1497 if (nd->nd_procnum >= NFS_NPROCS || 1498 (nd->nd_procnum > NFSPROC_COMMIT) || 1499 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1500 nd->nd_repstat = EPROCUNAVAIL; 1501 nd->nd_procnum = NFSPROC_NOOP; 1502 return (0); 1503 } 1504 if ((nd->nd_flag & ND_NFSV3) == 0) 1505 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1506 auth_type = *tl++; 1507 len = fxdr_unsigned(int, *tl++); 1508 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1509 m_freem(info.nmi_mrep); 1510 return (EBADRPC); 1511 } 1512 1513 /* Handle auth_unix */ 1514 if (auth_type == rpc_auth_unix) { 1515 len = fxdr_unsigned(int, *++tl); 1516 if (len < 0 || len > NFS_MAXNAMLEN) { 1517 m_freem(info.nmi_mrep); 1518 return (EBADRPC); 1519 } 1520 if (nfsm_adv(&info, nfsm_rndup(len)) != 0) 1521 goto nfsmout; 1522 tl = (uint32_t *)nfsm_dissect(&info, 3 * NFSX_UNSIGNED); 1523 if (tl == NULL) 1524 goto nfsmout; 1525 memset(&nd->nd_cr, 0, sizeof (struct ucred)); 1526 refcnt_init(&nd->nd_cr.cr_refcnt); 1527 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1528 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1529 len = fxdr_unsigned(int, *tl); 1530 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1531 m_freem(info.nmi_mrep); 1532 return (EBADRPC); 1533 } 1534 tl = (uint32_t *) 1535 nfsm_dissect(&info, (len + 2) * NFSX_UNSIGNED); 1536 if (tl == NULL) 1537 goto nfsmout; 1538 for (i = 0; i < len; i++) { 1539 if (i < NGROUPS_MAX) 1540 nd->nd_cr.cr_groups[i] = 1541 fxdr_unsigned(gid_t, *tl++); 1542 else 1543 tl++; 1544 } 1545 nd->nd_cr.cr_ngroups = (len > NGROUPS_MAX) ? NGROUPS_MAX : len; 1546 len = fxdr_unsigned(int, *++tl); 1547 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1548 m_freem(info.nmi_mrep); 1549 return (EBADRPC); 1550 } 1551 if (len > 0) { 1552 if (nfsm_adv(&info, nfsm_rndup(len)) != 0) 1553 goto nfsmout; 1554 } 1555 } else { 1556 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1557 nd->nd_procnum = NFSPROC_NOOP; 1558 return (0); 1559 } 1560 1561 nd->nd_md = info.nmi_md; 1562 nd->nd_dpos = info.nmi_dpos; 1563 return (0); 1564 nfsmout: 1565 return (error); 1566 } 1567 1568 void 1569 nfs_msg(struct nfsreq *rep, char *msg) 1570 { 1571 tpr_t tpr; 1572 1573 if (rep->r_procp) 1574 tpr = tprintf_open(rep->r_procp); 1575 else 1576 tpr = NULL; 1577 1578 tprintf(tpr, "nfs server %s: %s\n", 1579 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname, msg); 1580 tprintf_close(tpr); 1581 } 1582 1583 #ifdef NFSSERVER 1584 /* 1585 * Socket upcall routine for the nfsd sockets. 1586 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1587 * Essentially do as much as possible non-blocking, else punt and it will 1588 * be called with M_WAIT from an nfsd. 1589 */ 1590 void 1591 nfsrv_rcv(struct socket *so, caddr_t arg, int waitflag) 1592 { 1593 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1594 struct mbuf *m; 1595 struct mbuf *mp, *nam; 1596 struct uio auio; 1597 int flags, error; 1598 1599 KERNEL_LOCK(); 1600 1601 if ((slp->ns_flag & SLP_VALID) == 0) 1602 goto out; 1603 1604 /* Defer soreceive() to an nfsd. */ 1605 if (waitflag == M_DONTWAIT) { 1606 slp->ns_flag |= SLP_NEEDQ; 1607 goto dorecs; 1608 } 1609 1610 auio.uio_procp = NULL; 1611 if (so->so_type == SOCK_STREAM) { 1612 /* 1613 * Do soreceive(). 1614 */ 1615 auio.uio_resid = 1000000000; 1616 flags = MSG_DONTWAIT; 1617 error = soreceive(so, NULL, &auio, &mp, NULL, 1618 &flags, 0); 1619 if (error || mp == NULL) { 1620 if (error == EWOULDBLOCK) 1621 slp->ns_flag |= SLP_NEEDQ; 1622 else 1623 slp->ns_flag |= SLP_DISCONN; 1624 goto dorecs; 1625 } 1626 m = mp; 1627 if (slp->ns_rawend) { 1628 slp->ns_rawend->m_next = m; 1629 slp->ns_cc += 1000000000 - auio.uio_resid; 1630 } else { 1631 slp->ns_raw = m; 1632 slp->ns_cc = 1000000000 - auio.uio_resid; 1633 } 1634 while (m->m_next) 1635 m = m->m_next; 1636 slp->ns_rawend = m; 1637 1638 /* 1639 * Now try and parse record(s) out of the raw stream data. 1640 */ 1641 error = nfsrv_getstream(slp, waitflag); 1642 if (error) { 1643 if (error == EPERM) 1644 slp->ns_flag |= SLP_DISCONN; 1645 else 1646 slp->ns_flag |= SLP_NEEDQ; 1647 } 1648 } else { 1649 do { 1650 auio.uio_resid = 1000000000; 1651 flags = MSG_DONTWAIT; 1652 error = soreceive(so, &nam, &auio, &mp, 1653 NULL, &flags, 0); 1654 if (mp) { 1655 m = nam; 1656 m->m_next = mp; 1657 if (slp->ns_recend) 1658 slp->ns_recend->m_nextpkt = m; 1659 else 1660 slp->ns_rec = m; 1661 slp->ns_recend = m; 1662 m->m_nextpkt = NULL; 1663 } 1664 if (error) { 1665 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 1666 && error != EWOULDBLOCK) { 1667 slp->ns_flag |= SLP_DISCONN; 1668 goto dorecs; 1669 } 1670 } 1671 } while (mp); 1672 } 1673 1674 /* 1675 * Now try and process the request records, non-blocking. 1676 */ 1677 dorecs: 1678 if (waitflag == M_DONTWAIT && 1679 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 1680 nfsrv_wakenfsd(slp); 1681 1682 out: 1683 KERNEL_UNLOCK(); 1684 } 1685 1686 /* 1687 * Try and extract an RPC request from the mbuf data list received on a 1688 * stream socket. The "waitflag" argument indicates whether or not it 1689 * can sleep. 1690 */ 1691 int 1692 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag) 1693 { 1694 struct mbuf *m, **mpp; 1695 char *cp1, *cp2; 1696 int len; 1697 struct mbuf *om, *m2, *recm; 1698 u_int32_t recmark; 1699 1700 if (slp->ns_flag & SLP_GETSTREAM) 1701 return (0); 1702 slp->ns_flag |= SLP_GETSTREAM; 1703 for (;;) { 1704 if (slp->ns_reclen == 0) { 1705 if (slp->ns_cc < NFSX_UNSIGNED) { 1706 slp->ns_flag &= ~SLP_GETSTREAM; 1707 return (0); 1708 } 1709 m = slp->ns_raw; 1710 if (m->m_len >= NFSX_UNSIGNED) { 1711 bcopy(mtod(m, caddr_t), &recmark, 1712 NFSX_UNSIGNED); 1713 m->m_data += NFSX_UNSIGNED; 1714 m->m_len -= NFSX_UNSIGNED; 1715 } else { 1716 cp1 = (caddr_t)&recmark; 1717 cp2 = mtod(m, caddr_t); 1718 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 1719 while (m->m_len == 0) { 1720 m = m->m_next; 1721 cp2 = mtod(m, caddr_t); 1722 } 1723 *cp1++ = *cp2++; 1724 m->m_data++; 1725 m->m_len--; 1726 } 1727 } 1728 slp->ns_cc -= NFSX_UNSIGNED; 1729 recmark = ntohl(recmark); 1730 slp->ns_reclen = recmark & ~0x80000000; 1731 if (recmark & 0x80000000) 1732 slp->ns_flag |= SLP_LASTFRAG; 1733 else 1734 slp->ns_flag &= ~SLP_LASTFRAG; 1735 if (slp->ns_reclen > NFS_MAXPACKET) { 1736 slp->ns_flag &= ~SLP_GETSTREAM; 1737 return (EPERM); 1738 } 1739 } 1740 1741 /* 1742 * Now get the record part. 1743 */ 1744 recm = NULL; 1745 if (slp->ns_cc == slp->ns_reclen) { 1746 recm = slp->ns_raw; 1747 slp->ns_raw = slp->ns_rawend = NULL; 1748 slp->ns_cc = slp->ns_reclen = 0; 1749 } else if (slp->ns_cc > slp->ns_reclen) { 1750 len = 0; 1751 m = slp->ns_raw; 1752 om = NULL; 1753 while (len < slp->ns_reclen) { 1754 if ((len + m->m_len) > slp->ns_reclen) { 1755 m2 = m_copym(m, 0, slp->ns_reclen - len, 1756 waitflag); 1757 if (m2) { 1758 if (om) { 1759 om->m_next = m2; 1760 recm = slp->ns_raw; 1761 } else 1762 recm = m2; 1763 m->m_data += slp->ns_reclen-len; 1764 m->m_len -= slp->ns_reclen-len; 1765 len = slp->ns_reclen; 1766 } else { 1767 slp->ns_flag &= ~SLP_GETSTREAM; 1768 return (EWOULDBLOCK); 1769 } 1770 } else if ((len + m->m_len) == slp->ns_reclen) { 1771 om = m; 1772 len += m->m_len; 1773 m = m->m_next; 1774 recm = slp->ns_raw; 1775 om->m_next = NULL; 1776 } else { 1777 om = m; 1778 len += m->m_len; 1779 m = m->m_next; 1780 } 1781 } 1782 slp->ns_raw = m; 1783 slp->ns_cc -= len; 1784 slp->ns_reclen = 0; 1785 } else { 1786 slp->ns_flag &= ~SLP_GETSTREAM; 1787 return (0); 1788 } 1789 1790 /* 1791 * Accumulate the fragments into a record. 1792 */ 1793 mpp = &slp->ns_frag; 1794 while (*mpp) 1795 mpp = &((*mpp)->m_next); 1796 *mpp = recm; 1797 if (slp->ns_flag & SLP_LASTFRAG) { 1798 if (slp->ns_recend) 1799 slp->ns_recend->m_nextpkt = slp->ns_frag; 1800 else 1801 slp->ns_rec = slp->ns_frag; 1802 slp->ns_recend = slp->ns_frag; 1803 slp->ns_frag = NULL; 1804 } 1805 } 1806 } 1807 1808 /* 1809 * Parse an RPC header. 1810 */ 1811 int 1812 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, 1813 struct nfsrv_descript **ndp) 1814 { 1815 struct mbuf *m, *nam; 1816 struct nfsrv_descript *nd; 1817 int error; 1818 1819 *ndp = NULL; 1820 if ((slp->ns_flag & SLP_VALID) == 0 || 1821 (m = slp->ns_rec) == NULL) 1822 return (ENOBUFS); 1823 slp->ns_rec = m->m_nextpkt; 1824 if (slp->ns_rec) 1825 m->m_nextpkt = NULL; 1826 else 1827 slp->ns_recend = NULL; 1828 if (m->m_type == MT_SONAME) { 1829 nam = m; 1830 m = m->m_next; 1831 nam->m_next = NULL; 1832 } else 1833 nam = NULL; 1834 nd = pool_get(&nfsrv_descript_pl, PR_WAITOK); 1835 nfs_realign(&m, 10 * NFSX_UNSIGNED); 1836 nd->nd_md = nd->nd_mrep = m; 1837 nd->nd_nam2 = nam; 1838 nd->nd_dpos = mtod(m, caddr_t); 1839 error = nfs_getreq(nd, nfsd, 1); 1840 if (error) { 1841 m_freem(nam); 1842 pool_put(&nfsrv_descript_pl, nd); 1843 return (error); 1844 } 1845 *ndp = nd; 1846 nfsd->nfsd_nd = nd; 1847 return (0); 1848 } 1849 1850 1851 /* 1852 * Search for a sleeping nfsd and wake it up. 1853 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 1854 * running nfsds will go look for the work in the nfssvc_sock list. 1855 */ 1856 void 1857 nfsrv_wakenfsd(struct nfssvc_sock *slp) 1858 { 1859 struct nfsd *nfsd; 1860 1861 if ((slp->ns_flag & SLP_VALID) == 0) 1862 return; 1863 1864 TAILQ_FOREACH(nfsd, &nfsd_head, nfsd_chain) { 1865 if (nfsd->nfsd_flag & NFSD_WAITING) { 1866 nfsd->nfsd_flag &= ~NFSD_WAITING; 1867 if (nfsd->nfsd_slp) 1868 panic("nfsd wakeup"); 1869 slp->ns_sref++; 1870 nfsd->nfsd_slp = slp; 1871 wakeup_one(nfsd); 1872 return; 1873 } 1874 } 1875 1876 slp->ns_flag |= SLP_DOREC; 1877 nfsd_head_flag |= NFSD_CHECKSLP; 1878 } 1879 #endif /* NFSSERVER */ 1880