1 /* $NetBSD: nfs_socket.c,v 1.39 1997/10/10 01:53:24 fvdl 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/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/mount.h> 49 #include <sys/kernel.h> 50 #include <sys/mbuf.h> 51 #include <sys/vnode.h> 52 #include <sys/domain.h> 53 #include <sys/protosw.h> 54 #include <sys/socket.h> 55 #include <sys/socketvar.h> 56 #include <sys/syslog.h> 57 #include <sys/tprintf.h> 58 #include <sys/namei.h> 59 60 #include <netinet/in.h> 61 #include <netinet/tcp.h> 62 63 #include <nfs/rpcv2.h> 64 #include <nfs/nfsproto.h> 65 #include <nfs/nfs.h> 66 #include <nfs/xdr_subs.h> 67 #include <nfs/nfsm_subs.h> 68 #include <nfs/nfsmount.h> 69 #include <nfs/nfsnode.h> 70 #include <nfs/nfsrtt.h> 71 #include <nfs/nqnfs.h> 72 #include <nfs/nfs_var.h> 73 74 #define TRUE 1 75 #define FALSE 0 76 77 /* 78 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 79 * Use the mean and mean deviation of rtt for the appropriate type of rpc 80 * for the frequent rpcs and a default for the others. 81 * The justification for doing "other" this way is that these rpcs 82 * happen so infrequently that timer est. would probably be stale. 83 * Also, since many of these rpcs are 84 * non-idempotent, a conservative timeout is desired. 85 * getattr, lookup - A+2D 86 * read, write - A+4D 87 * other - nm_timeo 88 */ 89 #define NFS_RTO(n, t) \ 90 ((t) == 0 ? (n)->nm_timeo : \ 91 ((t) < 3 ? \ 92 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 93 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 94 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 95 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 96 /* 97 * External data, mostly RPC constants in XDR form 98 */ 99 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 100 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 101 rpc_auth_kerb; 102 extern u_int32_t nfs_prog, nqnfs_prog; 103 extern time_t nqnfsstarttime; 104 extern struct nfsstats nfsstats; 105 extern int nfsv3_procid[NFS_NPROCS]; 106 extern int nfs_ticks; 107 108 /* 109 * Defines which timer to use for the procnum. 110 * 0 - default 111 * 1 - getattr 112 * 2 - lookup 113 * 3 - read 114 * 4 - write 115 */ 116 static int proct[NFS_NPROCS] = { 117 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 118 0, 0, 0, 119 }; 120 121 /* 122 * There is a congestion window for outstanding rpcs maintained per mount 123 * point. The cwnd size is adjusted in roughly the way that: 124 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 125 * SIGCOMM '88". ACM, August 1988. 126 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 127 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 128 * of rpcs is in progress. 129 * (The sent count and cwnd are scaled for integer arith.) 130 * Variants of "slow start" were tried and were found to be too much of a 131 * performance hit (ave. rtt 3 times larger), 132 * I suspect due to the large rtt that nfs rpcs have. 133 */ 134 #define NFS_CWNDSCALE 256 135 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 136 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 137 int nfsrtton = 0; 138 struct nfsrtt nfsrtt; 139 140 /* 141 * Initialize sockets and congestion for a new NFS connection. 142 * We do not free the sockaddr if error. 143 */ 144 int 145 nfs_connect(nmp, rep) 146 register struct nfsmount *nmp; 147 struct nfsreq *rep; 148 { 149 register struct socket *so; 150 int s, error, rcvreserve, sndreserve; 151 struct sockaddr *saddr; 152 struct sockaddr_in *sin; 153 struct mbuf *m; 154 u_int16_t tport; 155 156 nmp->nm_so = (struct socket *)0; 157 saddr = mtod(nmp->nm_nam, struct sockaddr *); 158 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 159 nmp->nm_soproto); 160 if (error) 161 goto bad; 162 so = nmp->nm_so; 163 nmp->nm_soflags = so->so_proto->pr_flags; 164 165 /* 166 * Some servers require that the client port be a reserved port number. 167 */ 168 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 169 MGET(m, M_WAIT, MT_SONAME); 170 sin = mtod(m, struct sockaddr_in *); 171 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 172 sin->sin_family = AF_INET; 173 sin->sin_addr.s_addr = INADDR_ANY; 174 tport = IPPORT_RESERVED - 1; 175 sin->sin_port = htons(tport); 176 while ((error = sobind(so, m)) == EADDRINUSE && 177 --tport > IPPORT_RESERVED / 2) 178 sin->sin_port = htons(tport); 179 m_freem(m); 180 if (error) 181 goto bad; 182 } 183 184 /* 185 * Protocols that do not require connections may be optionally left 186 * unconnected for servers that reply from a port other than NFS_PORT. 187 */ 188 if (nmp->nm_flag & NFSMNT_NOCONN) { 189 if (nmp->nm_soflags & PR_CONNREQUIRED) { 190 error = ENOTCONN; 191 goto bad; 192 } 193 } else { 194 error = soconnect(so, nmp->nm_nam); 195 if (error) 196 goto bad; 197 198 /* 199 * Wait for the connection to complete. Cribbed from the 200 * connect system call but with the wait timing out so 201 * that interruptible mounts don't hang here for a long time. 202 */ 203 s = splsoftnet(); 204 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 205 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 206 "nfscon", 2 * hz); 207 if ((so->so_state & SS_ISCONNECTING) && 208 so->so_error == 0 && rep && 209 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 210 so->so_state &= ~SS_ISCONNECTING; 211 splx(s); 212 goto bad; 213 } 214 } 215 if (so->so_error) { 216 error = so->so_error; 217 so->so_error = 0; 218 splx(s); 219 goto bad; 220 } 221 splx(s); 222 } 223 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 224 so->so_rcv.sb_timeo = (5 * hz); 225 so->so_snd.sb_timeo = (5 * hz); 226 } else { 227 so->so_rcv.sb_timeo = 0; 228 so->so_snd.sb_timeo = 0; 229 } 230 if (nmp->nm_sotype == SOCK_DGRAM) { 231 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 232 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 233 NFS_MAXPKTHDR) * 2; 234 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 235 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 236 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 237 NFS_MAXPKTHDR) * 2; 238 } else { 239 if (nmp->nm_sotype != SOCK_STREAM) 240 panic("nfscon sotype"); 241 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 242 MGET(m, M_WAIT, MT_SOOPTS); 243 *mtod(m, int32_t *) = 1; 244 m->m_len = sizeof(int32_t); 245 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 246 } 247 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 248 MGET(m, M_WAIT, MT_SOOPTS); 249 *mtod(m, int32_t *) = 1; 250 m->m_len = sizeof(int32_t); 251 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 252 } 253 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 254 sizeof (u_int32_t)) * 2; 255 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 256 sizeof (u_int32_t)) * 2; 257 } 258 error = soreserve(so, sndreserve, rcvreserve); 259 if (error) 260 goto bad; 261 so->so_rcv.sb_flags |= SB_NOINTR; 262 so->so_snd.sb_flags |= SB_NOINTR; 263 264 /* Initialize other non-zero congestion variables */ 265 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 266 nmp->nm_srtt[4] = (NFS_TIMEO << 3); 267 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 268 nmp->nm_sdrtt[3] = nmp->nm_sdrtt[4] = 0; 269 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 270 nmp->nm_sent = 0; 271 nmp->nm_timeouts = 0; 272 return (0); 273 274 bad: 275 nfs_disconnect(nmp); 276 return (error); 277 } 278 279 /* 280 * Reconnect routine: 281 * Called when a connection is broken on a reliable protocol. 282 * - clean up the old socket 283 * - nfs_connect() again 284 * - set R_MUSTRESEND for all outstanding requests on mount point 285 * If this fails the mount point is DEAD! 286 * nb: Must be called with the nfs_sndlock() set on the mount point. 287 */ 288 int 289 nfs_reconnect(rep) 290 register struct nfsreq *rep; 291 { 292 register struct nfsreq *rp; 293 register struct nfsmount *nmp = rep->r_nmp; 294 int error; 295 296 nfs_disconnect(nmp); 297 while ((error = nfs_connect(nmp, rep)) != 0) { 298 if (error == EINTR || error == ERESTART) 299 return (EINTR); 300 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); 301 } 302 303 /* 304 * Loop through outstanding request list and fix up all requests 305 * on old socket. 306 */ 307 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) { 308 if (rp->r_nmp == nmp) 309 rp->r_flags |= R_MUSTRESEND; 310 } 311 return (0); 312 } 313 314 /* 315 * NFS disconnect. Clean up and unlink. 316 */ 317 void 318 nfs_disconnect(nmp) 319 register struct nfsmount *nmp; 320 { 321 register struct socket *so; 322 323 if (nmp->nm_so) { 324 so = nmp->nm_so; 325 nmp->nm_so = (struct socket *)0; 326 soshutdown(so, 2); 327 soclose(so); 328 } 329 } 330 331 /* 332 * This is the nfs send routine. For connection based socket types, it 333 * must be called with an nfs_sndlock() on the socket. 334 * "rep == NULL" indicates that it has been called from a server. 335 * For the client side: 336 * - return EINTR if the RPC is terminated, 0 otherwise 337 * - set R_MUSTRESEND if the send fails for any reason 338 * - do any cleanup required by recoverable socket errors (???) 339 * For the server side: 340 * - return EINTR or ERESTART if interrupted by a signal 341 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 342 * - do any cleanup required by recoverable socket errors (???) 343 */ 344 int 345 nfs_send(so, nam, top, rep) 346 register struct socket *so; 347 struct mbuf *nam; 348 register struct mbuf *top; 349 struct nfsreq *rep; 350 { 351 struct mbuf *sendnam; 352 int error, soflags, flags; 353 354 if (rep) { 355 if (rep->r_flags & R_SOFTTERM) { 356 m_freem(top); 357 return (EINTR); 358 } 359 if ((so = rep->r_nmp->nm_so) == NULL) { 360 rep->r_flags |= R_MUSTRESEND; 361 m_freem(top); 362 return (0); 363 } 364 rep->r_flags &= ~R_MUSTRESEND; 365 soflags = rep->r_nmp->nm_soflags; 366 } else 367 soflags = so->so_proto->pr_flags; 368 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 369 sendnam = (struct mbuf *)0; 370 else 371 sendnam = nam; 372 if (so->so_type == SOCK_SEQPACKET) 373 flags = MSG_EOR; 374 else 375 flags = 0; 376 377 error = sosend(so, sendnam, (struct uio *)0, top, 378 (struct mbuf *)0, flags); 379 if (error) { 380 if (rep) { 381 log(LOG_INFO, "nfs send error %d for server %s\n",error, 382 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 383 /* 384 * Deal with errors for the client side. 385 */ 386 if (rep->r_flags & R_SOFTTERM) 387 error = EINTR; 388 else 389 rep->r_flags |= R_MUSTRESEND; 390 } else 391 log(LOG_INFO, "nfsd send error %d\n", error); 392 393 /* 394 * Handle any recoverable (soft) socket errors here. (???) 395 */ 396 if (error != EINTR && error != ERESTART && 397 error != EWOULDBLOCK && error != EPIPE) 398 error = 0; 399 } 400 return (error); 401 } 402 403 #ifdef NFS 404 /* 405 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 406 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 407 * Mark and consolidate the data into a new mbuf list. 408 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 409 * small mbufs. 410 * For SOCK_STREAM we must be very careful to read an entire record once 411 * we have read any of it, even if the system call has been interrupted. 412 */ 413 int 414 nfs_receive(rep, aname, mp) 415 register struct nfsreq *rep; 416 struct mbuf **aname; 417 struct mbuf **mp; 418 { 419 register struct socket *so; 420 struct uio auio; 421 struct iovec aio; 422 register struct mbuf *m; 423 struct mbuf *control; 424 u_int32_t len; 425 struct mbuf **getnam; 426 int error, sotype, rcvflg; 427 struct proc *p = curproc; /* XXX */ 428 429 /* 430 * Set up arguments for soreceive() 431 */ 432 *mp = (struct mbuf *)0; 433 *aname = (struct mbuf *)0; 434 sotype = rep->r_nmp->nm_sotype; 435 436 /* 437 * For reliable protocols, lock against other senders/receivers 438 * in case a reconnect is necessary. 439 * For SOCK_STREAM, first get the Record Mark to find out how much 440 * more there is to get. 441 * We must lock the socket against other receivers 442 * until we have an entire rpc request/reply. 443 */ 444 if (sotype != SOCK_DGRAM) { 445 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 446 if (error) 447 return (error); 448 tryagain: 449 /* 450 * Check for fatal errors and resending request. 451 */ 452 /* 453 * Ugh: If a reconnect attempt just happened, nm_so 454 * would have changed. NULL indicates a failed 455 * attempt that has essentially shut down this 456 * mount point. 457 */ 458 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 459 nfs_sndunlock(&rep->r_nmp->nm_iflag); 460 return (EINTR); 461 } 462 so = rep->r_nmp->nm_so; 463 if (!so) { 464 error = nfs_reconnect(rep); 465 if (error) { 466 nfs_sndunlock(&rep->r_nmp->nm_iflag); 467 return (error); 468 } 469 goto tryagain; 470 } 471 while (rep->r_flags & R_MUSTRESEND) { 472 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 473 nfsstats.rpcretries++; 474 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 475 if (error) { 476 if (error == EINTR || error == ERESTART || 477 (error = nfs_reconnect(rep)) != 0) { 478 nfs_sndunlock(&rep->r_nmp->nm_iflag); 479 return (error); 480 } 481 goto tryagain; 482 } 483 } 484 nfs_sndunlock(&rep->r_nmp->nm_iflag); 485 if (sotype == SOCK_STREAM) { 486 aio.iov_base = (caddr_t) &len; 487 aio.iov_len = sizeof(u_int32_t); 488 auio.uio_iov = &aio; 489 auio.uio_iovcnt = 1; 490 auio.uio_segflg = UIO_SYSSPACE; 491 auio.uio_rw = UIO_READ; 492 auio.uio_offset = 0; 493 auio.uio_resid = sizeof(u_int32_t); 494 auio.uio_procp = p; 495 do { 496 rcvflg = MSG_WAITALL; 497 error = soreceive(so, (struct mbuf **)0, &auio, 498 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 499 if (error == EWOULDBLOCK && rep) { 500 if (rep->r_flags & R_SOFTTERM) 501 return (EINTR); 502 } 503 } while (error == EWOULDBLOCK); 504 if (!error && auio.uio_resid > 0) { 505 log(LOG_INFO, 506 "short receive (%d/%d) from nfs server %s\n", 507 sizeof(u_int32_t) - auio.uio_resid, 508 sizeof(u_int32_t), 509 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 510 error = EPIPE; 511 } 512 if (error) 513 goto errout; 514 len = ntohl(len) & ~0x80000000; 515 /* 516 * This is SERIOUS! We are out of sync with the sender 517 * and forcing a disconnect/reconnect is all I can do. 518 */ 519 if (len > NFS_MAXPACKET) { 520 log(LOG_ERR, "%s (%d) from nfs server %s\n", 521 "impossible packet length", 522 len, 523 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 524 error = EFBIG; 525 goto errout; 526 } 527 auio.uio_resid = len; 528 do { 529 rcvflg = MSG_WAITALL; 530 error = soreceive(so, (struct mbuf **)0, 531 &auio, mp, (struct mbuf **)0, &rcvflg); 532 } while (error == EWOULDBLOCK || error == EINTR || 533 error == ERESTART); 534 if (!error && auio.uio_resid > 0) { 535 log(LOG_INFO, 536 "short receive (%d/%d) from nfs server %s\n", 537 len - auio.uio_resid, len, 538 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 539 error = EPIPE; 540 } 541 } else { 542 /* 543 * NB: Since uio_resid is big, MSG_WAITALL is ignored 544 * and soreceive() will return when it has either a 545 * control msg or a data msg. 546 * We have no use for control msg., but must grab them 547 * and then throw them away so we know what is going 548 * on. 549 */ 550 auio.uio_resid = len = 100000000; /* Anything Big */ 551 auio.uio_procp = p; 552 do { 553 rcvflg = 0; 554 error = soreceive(so, (struct mbuf **)0, 555 &auio, mp, &control, &rcvflg); 556 if (control) 557 m_freem(control); 558 if (error == EWOULDBLOCK && rep) { 559 if (rep->r_flags & R_SOFTTERM) 560 return (EINTR); 561 } 562 } while (error == EWOULDBLOCK || 563 (!error && *mp == NULL && control)); 564 if ((rcvflg & MSG_EOR) == 0) 565 printf("Egad!!\n"); 566 if (!error && *mp == NULL) 567 error = EPIPE; 568 len -= auio.uio_resid; 569 } 570 errout: 571 if (error && error != EINTR && error != ERESTART) { 572 m_freem(*mp); 573 *mp = (struct mbuf *)0; 574 if (error != EPIPE) 575 log(LOG_INFO, 576 "receive error %d from nfs server %s\n", 577 error, 578 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 579 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 580 if (!error) 581 error = nfs_reconnect(rep); 582 if (!error) 583 goto tryagain; 584 else 585 nfs_sndunlock(&rep->r_nmp->nm_iflag); 586 } 587 } else { 588 if ((so = rep->r_nmp->nm_so) == NULL) 589 return (EACCES); 590 if (so->so_state & SS_ISCONNECTED) 591 getnam = (struct mbuf **)0; 592 else 593 getnam = aname; 594 auio.uio_resid = len = 1000000; 595 auio.uio_procp = p; 596 do { 597 rcvflg = 0; 598 error = soreceive(so, getnam, &auio, mp, 599 (struct mbuf **)0, &rcvflg); 600 if (error == EWOULDBLOCK && 601 (rep->r_flags & R_SOFTTERM)) 602 return (EINTR); 603 } while (error == EWOULDBLOCK); 604 len -= auio.uio_resid; 605 } 606 if (error) { 607 m_freem(*mp); 608 *mp = (struct mbuf *)0; 609 } 610 return (error); 611 } 612 613 /* 614 * Implement receipt of reply on a socket. 615 * We must search through the list of received datagrams matching them 616 * with outstanding requests using the xid, until ours is found. 617 */ 618 /* ARGSUSED */ 619 int 620 nfs_reply(myrep) 621 struct nfsreq *myrep; 622 { 623 register struct nfsreq *rep; 624 register struct nfsmount *nmp = myrep->r_nmp; 625 register int32_t t1; 626 struct mbuf *mrep, *nam, *md; 627 u_int32_t rxid, *tl; 628 caddr_t dpos, cp2; 629 int error; 630 631 /* 632 * Loop around until we get our own reply 633 */ 634 for (;;) { 635 /* 636 * Lock against other receivers so that I don't get stuck in 637 * sbwait() after someone else has received my reply for me. 638 * Also necessary for connection based protocols to avoid 639 * race conditions during a reconnect. 640 */ 641 error = nfs_rcvlock(myrep); 642 if (error == EALREADY) 643 return (0); 644 if (error) 645 return (error); 646 /* 647 * Get the next Rpc reply off the socket 648 */ 649 error = nfs_receive(myrep, &nam, &mrep); 650 nfs_rcvunlock(&nmp->nm_iflag); 651 if (error) { 652 653 /* 654 * Ignore routing errors on connectionless protocols?? 655 */ 656 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 657 nmp->nm_so->so_error = 0; 658 #ifdef DEBUG 659 printf("nfs_reply: ignoring error %d\n", error); 660 #endif 661 if (myrep->r_flags & R_GETONEREP) 662 return (0); 663 continue; 664 } 665 return (error); 666 } 667 if (nam) 668 m_freem(nam); 669 670 /* 671 * XXX: Temporary work-around for unexplained lossage with a 672 * XXX: netmask that's not byte-aligned, i.e. 255.255.255.192. 673 * XXX: See PR kern/3579 for details. 674 */ 675 if (mrep == 0) { 676 printf("nfs_reply: null mbuf from nfs_receive()\n"); 677 continue; 678 } 679 680 /* 681 * Get the xid and check that it is an rpc reply 682 */ 683 md = mrep; 684 dpos = mtod(md, caddr_t); 685 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 686 rxid = *tl++; 687 if (*tl != rpc_reply) { 688 if (nmp->nm_flag & NFSMNT_NQNFS) { 689 if (nqnfs_callback(nmp, mrep, md, dpos)) 690 nfsstats.rpcinvalid++; 691 } else { 692 nfsstats.rpcinvalid++; 693 m_freem(mrep); 694 } 695 nfsmout: 696 if (myrep->r_flags & R_GETONEREP) 697 return (0); 698 continue; 699 } 700 701 /* 702 * Loop through the request list to match up the reply 703 * Iff no match, just drop the datagram 704 */ 705 for (rep = nfs_reqq.tqh_first; rep != 0; 706 rep = rep->r_chain.tqe_next) { 707 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 708 /* Found it.. */ 709 rep->r_mrep = mrep; 710 rep->r_md = md; 711 rep->r_dpos = dpos; 712 if (nfsrtton) { 713 struct rttl *rt; 714 715 rt = &nfsrtt.rttl[nfsrtt.pos]; 716 rt->proc = rep->r_procnum; 717 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 718 rt->sent = nmp->nm_sent; 719 rt->cwnd = nmp->nm_cwnd; 720 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 721 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 722 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 723 rt->tstamp = time; 724 if (rep->r_flags & R_TIMING) 725 rt->rtt = rep->r_rtt; 726 else 727 rt->rtt = 1000000; 728 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 729 } 730 /* 731 * Update congestion window. 732 * Do the additive increase of 733 * one rpc/rtt. 734 */ 735 if (nmp->nm_cwnd <= nmp->nm_sent) { 736 nmp->nm_cwnd += 737 (NFS_CWNDSCALE * NFS_CWNDSCALE + 738 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 739 if (nmp->nm_cwnd > NFS_MAXCWND) 740 nmp->nm_cwnd = NFS_MAXCWND; 741 } 742 rep->r_flags &= ~R_SENT; 743 nmp->nm_sent -= NFS_CWNDSCALE; 744 /* 745 * Update rtt using a gain of 0.125 on the mean 746 * and a gain of 0.25 on the deviation. 747 */ 748 if (rep->r_flags & R_TIMING) { 749 /* 750 * Since the timer resolution of 751 * NFS_HZ is so course, it can often 752 * result in r_rtt == 0. Since 753 * r_rtt == N means that the actual 754 * rtt is between N+dt and N+2-dt ticks, 755 * add 1. 756 */ 757 t1 = rep->r_rtt + 1; 758 t1 -= (NFS_SRTT(rep) >> 3); 759 NFS_SRTT(rep) += t1; 760 if (t1 < 0) 761 t1 = -t1; 762 t1 -= (NFS_SDRTT(rep) >> 2); 763 NFS_SDRTT(rep) += t1; 764 } 765 nmp->nm_timeouts = 0; 766 break; 767 } 768 } 769 /* 770 * If not matched to a request, drop it. 771 * If it's mine, get out. 772 */ 773 if (rep == 0) { 774 nfsstats.rpcunexpected++; 775 m_freem(mrep); 776 } else if (rep == myrep) { 777 if (rep->r_mrep == NULL) 778 panic("nfsreply nil"); 779 return (0); 780 } 781 if (myrep->r_flags & R_GETONEREP) 782 return (0); 783 } 784 } 785 786 /* 787 * nfs_request - goes something like this 788 * - fill in request struct 789 * - links it into list 790 * - calls nfs_send() for first transmit 791 * - calls nfs_receive() to get reply 792 * - break down rpc header and return with nfs reply pointed to 793 * by mrep or error 794 * nb: always frees up mreq mbuf list 795 */ 796 int 797 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp) 798 struct vnode *vp; 799 struct mbuf *mrest; 800 int procnum; 801 struct proc *procp; 802 struct ucred *cred; 803 struct mbuf **mrp; 804 struct mbuf **mdp; 805 caddr_t *dposp; 806 { 807 register struct mbuf *m, *mrep; 808 register struct nfsreq *rep; 809 register u_int32_t *tl; 810 register int i; 811 struct nfsmount *nmp; 812 struct mbuf *md, *mheadend; 813 struct nfsnode *np; 814 char nickv[RPCX_NICKVERF]; 815 time_t reqtime, waituntil; 816 caddr_t dpos, cp2; 817 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type; 818 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 819 int verf_len, verf_type; 820 u_int32_t xid; 821 u_quad_t frev; 822 char *auth_str, *verf_str; 823 NFSKERBKEY_T key; /* save session key */ 824 825 nmp = VFSTONFS(vp->v_mount); 826 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 827 rep->r_nmp = nmp; 828 rep->r_vp = vp; 829 rep->r_procp = procp; 830 rep->r_procnum = procnum; 831 i = 0; 832 m = mrest; 833 while (m) { 834 i += m->m_len; 835 m = m->m_next; 836 } 837 mrest_len = i; 838 839 /* 840 * Get the RPC header with authorization. 841 */ 842 kerbauth: 843 verf_str = auth_str = (char *)0; 844 if (nmp->nm_flag & NFSMNT_KERB) { 845 verf_str = nickv; 846 verf_len = sizeof (nickv); 847 auth_type = RPCAUTH_KERB4; 848 bzero((caddr_t)key, sizeof (key)); 849 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 850 &auth_len, verf_str, verf_len)) { 851 error = nfs_getauth(nmp, rep, cred, &auth_str, 852 &auth_len, verf_str, &verf_len, key); 853 if (error) { 854 free((caddr_t)rep, M_NFSREQ); 855 m_freem(mrest); 856 return (error); 857 } 858 } 859 } else { 860 auth_type = RPCAUTH_UNIX; 861 auth_len = (((cred->cr_ngroups > nmp->nm_numgrps) ? 862 nmp->nm_numgrps : cred->cr_ngroups) << 2) + 863 5 * NFSX_UNSIGNED; 864 } 865 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 866 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 867 if (auth_str) 868 free(auth_str, M_TEMP); 869 870 /* 871 * For stream protocols, insert a Sun RPC Record Mark. 872 */ 873 if (nmp->nm_sotype == SOCK_STREAM) { 874 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 875 *mtod(m, u_int32_t *) = htonl(0x80000000 | 876 (m->m_pkthdr.len - NFSX_UNSIGNED)); 877 } 878 rep->r_mreq = m; 879 rep->r_xid = xid; 880 tryagain: 881 if (nmp->nm_flag & NFSMNT_SOFT) 882 rep->r_retry = nmp->nm_retry; 883 else 884 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 885 rep->r_rtt = rep->r_rexmit = 0; 886 if (proct[procnum] > 0) 887 rep->r_flags = R_TIMING; 888 else 889 rep->r_flags = 0; 890 rep->r_mrep = NULL; 891 892 /* 893 * Do the client side RPC. 894 */ 895 nfsstats.rpcrequests++; 896 /* 897 * Chain request into list of outstanding requests. Be sure 898 * to put it LAST so timer finds oldest requests first. 899 */ 900 s = splsoftnet(); 901 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 902 903 /* Get send time for nqnfs */ 904 reqtime = time.tv_sec; 905 906 /* 907 * If backing off another request or avoiding congestion, don't 908 * send this one now but let timer do it. If not timing a request, 909 * do it now. 910 */ 911 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 912 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 913 nmp->nm_sent < nmp->nm_cwnd)) { 914 splx(s); 915 if (nmp->nm_soflags & PR_CONNREQUIRED) 916 error = nfs_sndlock(&nmp->nm_iflag, rep); 917 if (!error) { 918 m = m_copym(m, 0, M_COPYALL, M_WAIT); 919 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep); 920 if (nmp->nm_soflags & PR_CONNREQUIRED) 921 nfs_sndunlock(&nmp->nm_iflag); 922 } 923 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 924 nmp->nm_sent += NFS_CWNDSCALE; 925 rep->r_flags |= R_SENT; 926 } 927 } else { 928 splx(s); 929 rep->r_rtt = -1; 930 } 931 932 /* 933 * Wait for the reply from our send or the timer's. 934 */ 935 if (!error || error == EPIPE) 936 error = nfs_reply(rep); 937 938 /* 939 * RPC done, unlink the request. 940 */ 941 s = splsoftnet(); 942 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 943 splx(s); 944 945 /* 946 * Decrement the outstanding request count. 947 */ 948 if (rep->r_flags & R_SENT) { 949 rep->r_flags &= ~R_SENT; /* paranoia */ 950 nmp->nm_sent -= NFS_CWNDSCALE; 951 } 952 953 /* 954 * If there was a successful reply and a tprintf msg. 955 * tprintf a response. 956 */ 957 if (!error && (rep->r_flags & R_TPRINTFMSG)) 958 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 959 "is alive again"); 960 mrep = rep->r_mrep; 961 md = rep->r_md; 962 dpos = rep->r_dpos; 963 if (error) { 964 m_freem(rep->r_mreq); 965 free((caddr_t)rep, M_NFSREQ); 966 return (error); 967 } 968 969 /* 970 * break down the rpc header and check if ok 971 */ 972 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 973 if (*tl++ == rpc_msgdenied) { 974 if (*tl == rpc_mismatch) 975 error = EOPNOTSUPP; 976 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 977 if (!failed_auth) { 978 failed_auth++; 979 mheadend->m_next = (struct mbuf *)0; 980 m_freem(mrep); 981 m_freem(rep->r_mreq); 982 goto kerbauth; 983 } else 984 error = EAUTH; 985 } else 986 error = EACCES; 987 m_freem(mrep); 988 m_freem(rep->r_mreq); 989 free((caddr_t)rep, M_NFSREQ); 990 return (error); 991 } 992 993 /* 994 * Grab any Kerberos verifier, otherwise just throw it away. 995 */ 996 verf_type = fxdr_unsigned(int, *tl++); 997 i = fxdr_unsigned(int32_t, *tl); 998 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 999 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1000 if (error) 1001 goto nfsmout; 1002 } else if (i > 0) 1003 nfsm_adv(nfsm_rndup(i)); 1004 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1005 /* 0 == ok */ 1006 if (*tl == 0) { 1007 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1008 if (*tl != 0) { 1009 error = fxdr_unsigned(int, *tl); 1010 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1011 error == NFSERR_TRYLATER) { 1012 m_freem(mrep); 1013 error = 0; 1014 waituntil = time.tv_sec + trylater_delay; 1015 while (time.tv_sec < waituntil) 1016 (void) tsleep((caddr_t)&lbolt, 1017 PSOCK, "nqnfstry", 0); 1018 trylater_delay *= nfs_backoff[trylater_cnt]; 1019 if (trylater_cnt < 7) 1020 trylater_cnt++; 1021 goto tryagain; 1022 } 1023 1024 /* 1025 * If the File Handle was stale, invalidate the 1026 * lookup cache, just in case. 1027 */ 1028 if (error == ESTALE) 1029 cache_purge(vp); 1030 if (nmp->nm_flag & NFSMNT_NFSV3) { 1031 *mrp = mrep; 1032 *mdp = md; 1033 *dposp = dpos; 1034 error |= NFSERR_RETERR; 1035 } else 1036 m_freem(mrep); 1037 m_freem(rep->r_mreq); 1038 free((caddr_t)rep, M_NFSREQ); 1039 return (error); 1040 } 1041 1042 /* 1043 * For nqnfs, get any lease in reply 1044 */ 1045 if (nmp->nm_flag & NFSMNT_NQNFS) { 1046 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1047 if (*tl) { 1048 np = VTONFS(vp); 1049 nqlflag = fxdr_unsigned(int, *tl); 1050 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1051 cachable = fxdr_unsigned(int, *tl++); 1052 reqtime += fxdr_unsigned(int, *tl++); 1053 if (reqtime > time.tv_sec) { 1054 fxdr_hyper(tl, &frev); 1055 nqnfs_clientlease(nmp, np, nqlflag, 1056 cachable, reqtime, frev); 1057 } 1058 } 1059 } 1060 *mrp = mrep; 1061 *mdp = md; 1062 *dposp = dpos; 1063 m_freem(rep->r_mreq); 1064 FREE((caddr_t)rep, M_NFSREQ); 1065 return (0); 1066 } 1067 m_freem(mrep); 1068 error = EPROTONOSUPPORT; 1069 nfsmout: 1070 m_freem(rep->r_mreq); 1071 free((caddr_t)rep, M_NFSREQ); 1072 return (error); 1073 } 1074 #endif /* NFS */ 1075 1076 /* 1077 * Generate the rpc reply header 1078 * siz arg. is used to decide if adding a cluster is worthwhile 1079 */ 1080 int 1081 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1082 int siz; 1083 struct nfsrv_descript *nd; 1084 struct nfssvc_sock *slp; 1085 int err; 1086 int cache; 1087 u_quad_t *frev; 1088 struct mbuf **mrq; 1089 struct mbuf **mbp; 1090 caddr_t *bposp; 1091 { 1092 register u_int32_t *tl; 1093 register struct mbuf *mreq; 1094 caddr_t bpos; 1095 struct mbuf *mb, *mb2; 1096 1097 MGETHDR(mreq, M_WAIT, MT_DATA); 1098 mb = mreq; 1099 /* 1100 * If this is a big reply, use a cluster else 1101 * try and leave leading space for the lower level headers. 1102 */ 1103 siz += RPC_REPLYSIZ; 1104 if (siz >= MINCLSIZE) { 1105 MCLGET(mreq, M_WAIT); 1106 } else 1107 mreq->m_data += max_hdr; 1108 tl = mtod(mreq, u_int32_t *); 1109 mreq->m_len = 6 * NFSX_UNSIGNED; 1110 bpos = ((caddr_t)tl) + mreq->m_len; 1111 *tl++ = txdr_unsigned(nd->nd_retxid); 1112 *tl++ = rpc_reply; 1113 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1114 *tl++ = rpc_msgdenied; 1115 if (err & NFSERR_AUTHERR) { 1116 *tl++ = rpc_autherr; 1117 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1118 mreq->m_len -= NFSX_UNSIGNED; 1119 bpos -= NFSX_UNSIGNED; 1120 } else { 1121 *tl++ = rpc_mismatch; 1122 *tl++ = txdr_unsigned(RPC_VER2); 1123 *tl = txdr_unsigned(RPC_VER2); 1124 } 1125 } else { 1126 *tl++ = rpc_msgaccepted; 1127 1128 /* 1129 * For Kerberos authentication, we must send the nickname 1130 * verifier back, otherwise just RPCAUTH_NULL. 1131 */ 1132 if (nd->nd_flag & ND_KERBFULL) { 1133 register struct nfsuid *nuidp; 1134 struct timeval ktvin, ktvout; 1135 1136 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1137 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1138 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1139 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1140 &nuidp->nu_haddr, nd->nd_nam2))) 1141 break; 1142 } 1143 if (nuidp) { 1144 ktvin.tv_sec = 1145 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1146 ktvin.tv_usec = 1147 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1148 1149 /* 1150 * Encrypt the timestamp in ecb mode using the 1151 * session key. 1152 */ 1153 #ifdef NFSKERB 1154 XXX 1155 #endif 1156 1157 *tl++ = rpc_auth_kerb; 1158 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1159 *tl = ktvout.tv_sec; 1160 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1161 *tl++ = ktvout.tv_usec; 1162 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1163 } else { 1164 *tl++ = 0; 1165 *tl++ = 0; 1166 } 1167 } else { 1168 *tl++ = 0; 1169 *tl++ = 0; 1170 } 1171 switch (err) { 1172 case EPROGUNAVAIL: 1173 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1174 break; 1175 case EPROGMISMATCH: 1176 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1177 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1178 if (nd->nd_flag & ND_NQNFS) { 1179 *tl++ = txdr_unsigned(3); 1180 *tl = txdr_unsigned(3); 1181 } else { 1182 *tl++ = txdr_unsigned(2); 1183 *tl = txdr_unsigned(3); 1184 } 1185 break; 1186 case EPROCUNAVAIL: 1187 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1188 break; 1189 case EBADRPC: 1190 *tl = txdr_unsigned(RPC_GARBAGE); 1191 break; 1192 default: 1193 *tl = 0; 1194 if (err != NFSERR_RETVOID) { 1195 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1196 if (err) 1197 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1198 else 1199 *tl = 0; 1200 } 1201 break; 1202 }; 1203 } 1204 1205 /* 1206 * For nqnfs, piggyback lease as requested. 1207 */ 1208 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1209 if (nd->nd_flag & ND_LEASE) { 1210 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1211 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1212 *tl++ = txdr_unsigned(cache); 1213 *tl++ = txdr_unsigned(nd->nd_duration); 1214 txdr_hyper(frev, tl); 1215 } else { 1216 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1217 *tl = 0; 1218 } 1219 } 1220 if (mrq != NULL) 1221 *mrq = mreq; 1222 *mbp = mb; 1223 *bposp = bpos; 1224 if (err != 0 && err != NFSERR_RETVOID) 1225 nfsstats.srvrpc_errs++; 1226 return (0); 1227 } 1228 1229 /* 1230 * Nfs timer routine 1231 * Scan the nfsreq list and retranmit any requests that have timed out 1232 * To avoid retransmission attempts on STREAM sockets (in the future) make 1233 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1234 */ 1235 void 1236 nfs_timer(arg) 1237 void *arg; /* never used */ 1238 { 1239 register struct nfsreq *rep; 1240 register struct mbuf *m; 1241 register struct socket *so; 1242 register struct nfsmount *nmp; 1243 register int timeo; 1244 int s, error; 1245 #ifdef NFSSERVER 1246 register struct nfssvc_sock *slp; 1247 static long lasttime = 0; 1248 u_quad_t cur_usec; 1249 #endif 1250 1251 s = splsoftnet(); 1252 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) { 1253 nmp = rep->r_nmp; 1254 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1255 continue; 1256 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1257 rep->r_flags |= R_SOFTTERM; 1258 continue; 1259 } 1260 if (rep->r_rtt >= 0) { 1261 rep->r_rtt++; 1262 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1263 timeo = nmp->nm_timeo; 1264 else 1265 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1266 if (nmp->nm_timeouts > 0) 1267 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1268 if (rep->r_rtt <= timeo) 1269 continue; 1270 if (nmp->nm_timeouts < 8) 1271 nmp->nm_timeouts++; 1272 } 1273 /* 1274 * Check for server not responding 1275 */ 1276 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1277 rep->r_rexmit > nmp->nm_deadthresh) { 1278 nfs_msg(rep->r_procp, 1279 nmp->nm_mountp->mnt_stat.f_mntfromname, 1280 "not responding"); 1281 rep->r_flags |= R_TPRINTFMSG; 1282 } 1283 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1284 nfsstats.rpctimeouts++; 1285 rep->r_flags |= R_SOFTTERM; 1286 continue; 1287 } 1288 if (nmp->nm_sotype != SOCK_DGRAM) { 1289 if (++rep->r_rexmit > NFS_MAXREXMIT) 1290 rep->r_rexmit = NFS_MAXREXMIT; 1291 continue; 1292 } 1293 if ((so = nmp->nm_so) == NULL) 1294 continue; 1295 1296 /* 1297 * If there is enough space and the window allows.. 1298 * Resend it 1299 * Set r_rtt to -1 in case we fail to send it now. 1300 */ 1301 rep->r_rtt = -1; 1302 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1303 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1304 (rep->r_flags & R_SENT) || 1305 nmp->nm_sent < nmp->nm_cwnd) && 1306 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1307 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1308 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1309 (struct mbuf *)0, (struct mbuf *)0, (struct proc *)0); 1310 else 1311 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1312 nmp->nm_nam, (struct mbuf *)0, (struct proc *)0); 1313 if (error) { 1314 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1315 #ifdef DEBUG 1316 printf("nfs_timer: ignoring error %d\n", 1317 error); 1318 #endif 1319 so->so_error = 0; 1320 } 1321 } else { 1322 /* 1323 * Iff first send, start timing 1324 * else turn timing off, backoff timer 1325 * and divide congestion window by 2. 1326 */ 1327 if (rep->r_flags & R_SENT) { 1328 rep->r_flags &= ~R_TIMING; 1329 if (++rep->r_rexmit > NFS_MAXREXMIT) 1330 rep->r_rexmit = NFS_MAXREXMIT; 1331 nmp->nm_cwnd >>= 1; 1332 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1333 nmp->nm_cwnd = NFS_CWNDSCALE; 1334 nfsstats.rpcretries++; 1335 } else { 1336 rep->r_flags |= R_SENT; 1337 nmp->nm_sent += NFS_CWNDSCALE; 1338 } 1339 rep->r_rtt = 0; 1340 } 1341 } 1342 } 1343 1344 #ifdef NFSSERVER 1345 /* 1346 * Call the nqnfs server timer once a second to handle leases. 1347 */ 1348 if (lasttime != time.tv_sec) { 1349 lasttime = time.tv_sec; 1350 nqnfs_serverd(); 1351 } 1352 1353 /* 1354 * Scan the write gathering queues for writes that need to be 1355 * completed now. 1356 */ 1357 cur_usec = (u_quad_t)time.tv_sec * 1000000 + (u_quad_t)time.tv_usec; 1358 for (slp = nfssvc_sockhead.tqh_first; slp != 0; 1359 slp = slp->ns_chain.tqe_next) { 1360 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) 1361 nfsrv_wakenfsd(slp); 1362 } 1363 #endif /* NFSSERVER */ 1364 splx(s); 1365 timeout(nfs_timer, (void *)0, nfs_ticks); 1366 } 1367 1368 /* 1369 * Test for a termination condition pending on the process. 1370 * This is used for NFSMNT_INT mounts. 1371 */ 1372 int 1373 nfs_sigintr(nmp, rep, p) 1374 struct nfsmount *nmp; 1375 struct nfsreq *rep; 1376 register struct proc *p; 1377 { 1378 1379 if (rep && (rep->r_flags & R_SOFTTERM)) 1380 return (EINTR); 1381 if (!(nmp->nm_flag & NFSMNT_INT)) 1382 return (0); 1383 if (p && p->p_siglist && 1384 (((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) & 1385 NFSINT_SIGMASK)) 1386 return (EINTR); 1387 return (0); 1388 } 1389 1390 /* 1391 * Lock a socket against others. 1392 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1393 * and also to avoid race conditions between the processes with nfs requests 1394 * in progress when a reconnect is necessary. 1395 */ 1396 int 1397 nfs_sndlock(flagp, rep) 1398 register int *flagp; 1399 struct nfsreq *rep; 1400 { 1401 struct proc *p; 1402 int slpflag = 0, slptimeo = 0; 1403 1404 if (rep) { 1405 p = rep->r_procp; 1406 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1407 slpflag = PCATCH; 1408 } else 1409 p = (struct proc *)0; 1410 while (*flagp & NFSMNT_SNDLOCK) { 1411 if (nfs_sigintr(rep->r_nmp, rep, p)) 1412 return (EINTR); 1413 *flagp |= NFSMNT_WANTSND; 1414 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1415 slptimeo); 1416 if (slpflag == PCATCH) { 1417 slpflag = 0; 1418 slptimeo = 2 * hz; 1419 } 1420 } 1421 *flagp |= NFSMNT_SNDLOCK; 1422 return (0); 1423 } 1424 1425 /* 1426 * Unlock the stream socket for others. 1427 */ 1428 void 1429 nfs_sndunlock(flagp) 1430 register int *flagp; 1431 { 1432 1433 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1434 panic("nfs sndunlock"); 1435 *flagp &= ~NFSMNT_SNDLOCK; 1436 if (*flagp & NFSMNT_WANTSND) { 1437 *flagp &= ~NFSMNT_WANTSND; 1438 wakeup((caddr_t)flagp); 1439 } 1440 } 1441 1442 int 1443 nfs_rcvlock(rep) 1444 register struct nfsreq *rep; 1445 { 1446 register int *flagp = &rep->r_nmp->nm_iflag; 1447 int slpflag, slptimeo = 0; 1448 1449 if (*flagp & NFSMNT_INT) 1450 slpflag = PCATCH; 1451 else 1452 slpflag = 0; 1453 while (*flagp & NFSMNT_RCVLOCK) { 1454 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1455 return (EINTR); 1456 *flagp |= NFSMNT_WANTRCV; 1457 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1458 slptimeo); 1459 /* If our reply was received while we were sleeping, 1460 * then just return without taking the lock to avoid a 1461 * situation where a single iod could 'capture' the 1462 * receive lock. 1463 */ 1464 if (rep->r_mrep != NULL) 1465 return (EALREADY); 1466 if (slpflag == PCATCH) { 1467 slpflag = 0; 1468 slptimeo = 2 * hz; 1469 } 1470 } 1471 *flagp |= NFSMNT_RCVLOCK; 1472 return (0); 1473 } 1474 1475 /* 1476 * Unlock the stream socket for others. 1477 */ 1478 void 1479 nfs_rcvunlock(flagp) 1480 register int *flagp; 1481 { 1482 1483 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1484 panic("nfs rcvunlock"); 1485 *flagp &= ~NFSMNT_RCVLOCK; 1486 if (*flagp & NFSMNT_WANTRCV) { 1487 *flagp &= ~NFSMNT_WANTRCV; 1488 wakeup((caddr_t)flagp); 1489 } 1490 } 1491 1492 /* 1493 * Parse an RPC request 1494 * - verify it 1495 * - fill in the cred struct. 1496 */ 1497 int 1498 nfs_getreq(nd, nfsd, has_header) 1499 register struct nfsrv_descript *nd; 1500 struct nfsd *nfsd; 1501 int has_header; 1502 { 1503 register int len, i; 1504 register u_int32_t *tl; 1505 register int32_t t1; 1506 struct uio uio; 1507 struct iovec iov; 1508 caddr_t dpos, cp2, cp; 1509 u_int32_t nfsvers, auth_type; 1510 uid_t nickuid; 1511 int error = 0, nqnfs = 0, ticklen; 1512 struct mbuf *mrep, *md; 1513 register struct nfsuid *nuidp; 1514 struct timeval tvin, tvout; 1515 1516 mrep = nd->nd_mrep; 1517 md = nd->nd_md; 1518 dpos = nd->nd_dpos; 1519 if (has_header) { 1520 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1521 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1522 if (*tl++ != rpc_call) { 1523 m_freem(mrep); 1524 return (EBADRPC); 1525 } 1526 } else 1527 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1528 nd->nd_repstat = 0; 1529 nd->nd_flag = 0; 1530 if (*tl++ != rpc_vers) { 1531 nd->nd_repstat = ERPCMISMATCH; 1532 nd->nd_procnum = NFSPROC_NOOP; 1533 return (0); 1534 } 1535 if (*tl != nfs_prog) { 1536 if (*tl == nqnfs_prog) 1537 nqnfs++; 1538 else { 1539 nd->nd_repstat = EPROGUNAVAIL; 1540 nd->nd_procnum = NFSPROC_NOOP; 1541 return (0); 1542 } 1543 } 1544 tl++; 1545 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1546 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1547 (nfsvers != NQNFS_VER3 && nqnfs)) { 1548 nd->nd_repstat = EPROGMISMATCH; 1549 nd->nd_procnum = NFSPROC_NOOP; 1550 return (0); 1551 } 1552 if (nqnfs) 1553 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1554 else if (nfsvers == NFS_VER3) 1555 nd->nd_flag = ND_NFSV3; 1556 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1557 if (nd->nd_procnum == NFSPROC_NULL) 1558 return (0); 1559 if (nd->nd_procnum >= NFS_NPROCS || 1560 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1561 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1562 nd->nd_repstat = EPROCUNAVAIL; 1563 nd->nd_procnum = NFSPROC_NOOP; 1564 return (0); 1565 } 1566 if ((nd->nd_flag & ND_NFSV3) == 0) 1567 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1568 auth_type = *tl++; 1569 len = fxdr_unsigned(int, *tl++); 1570 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1571 m_freem(mrep); 1572 return (EBADRPC); 1573 } 1574 1575 nd->nd_flag &= ~ND_KERBAUTH; 1576 /* 1577 * Handle auth_unix or auth_kerb. 1578 */ 1579 if (auth_type == rpc_auth_unix) { 1580 len = fxdr_unsigned(int, *++tl); 1581 if (len < 0 || len > NFS_MAXNAMLEN) { 1582 m_freem(mrep); 1583 return (EBADRPC); 1584 } 1585 nfsm_adv(nfsm_rndup(len)); 1586 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1587 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 1588 nd->nd_cr.cr_ref = 1; 1589 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1590 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1591 len = fxdr_unsigned(int, *tl); 1592 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1593 m_freem(mrep); 1594 return (EBADRPC); 1595 } 1596 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1597 for (i = 0; i < len; i++) 1598 if (i < NGROUPS) 1599 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1600 else 1601 tl++; 1602 nd->nd_cr.cr_ngroups = (len > NGROUPS) ? NGROUPS : len; 1603 if (nd->nd_cr.cr_ngroups > 1) 1604 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1605 len = fxdr_unsigned(int, *++tl); 1606 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1607 m_freem(mrep); 1608 return (EBADRPC); 1609 } 1610 if (len > 0) 1611 nfsm_adv(nfsm_rndup(len)); 1612 } else if (auth_type == rpc_auth_kerb) { 1613 switch (fxdr_unsigned(int, *tl++)) { 1614 case RPCAKN_FULLNAME: 1615 ticklen = fxdr_unsigned(int, *tl); 1616 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1617 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1618 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1619 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1620 m_freem(mrep); 1621 return (EBADRPC); 1622 } 1623 uio.uio_offset = 0; 1624 uio.uio_iov = &iov; 1625 uio.uio_iovcnt = 1; 1626 uio.uio_segflg = UIO_SYSSPACE; 1627 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1628 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1629 nfsm_mtouio(&uio, uio.uio_resid); 1630 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1631 if (*tl++ != rpc_auth_kerb || 1632 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1633 printf("Bad kerb verifier\n"); 1634 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1635 nd->nd_procnum = NFSPROC_NOOP; 1636 return (0); 1637 } 1638 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1639 tl = (u_int32_t *)cp; 1640 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1641 printf("Not fullname kerb verifier\n"); 1642 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1643 nd->nd_procnum = NFSPROC_NOOP; 1644 return (0); 1645 } 1646 cp += NFSX_UNSIGNED; 1647 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 1648 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1649 nd->nd_flag |= ND_KERBFULL; 1650 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1651 break; 1652 case RPCAKN_NICKNAME: 1653 if (len != 2 * NFSX_UNSIGNED) { 1654 printf("Kerb nickname short\n"); 1655 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1656 nd->nd_procnum = NFSPROC_NOOP; 1657 return (0); 1658 } 1659 nickuid = fxdr_unsigned(uid_t, *tl); 1660 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1661 if (*tl++ != rpc_auth_kerb || 1662 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1663 printf("Kerb nick verifier bad\n"); 1664 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1665 nd->nd_procnum = NFSPROC_NOOP; 1666 return (0); 1667 } 1668 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1669 tvin.tv_sec = *tl++; 1670 tvin.tv_usec = *tl; 1671 1672 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 1673 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1674 if (nuidp->nu_cr.cr_uid == nickuid && 1675 (!nd->nd_nam2 || 1676 netaddr_match(NU_NETFAM(nuidp), 1677 &nuidp->nu_haddr, nd->nd_nam2))) 1678 break; 1679 } 1680 if (!nuidp) { 1681 nd->nd_repstat = 1682 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1683 nd->nd_procnum = NFSPROC_NOOP; 1684 return (0); 1685 } 1686 1687 /* 1688 * Now, decrypt the timestamp using the session key 1689 * and validate it. 1690 */ 1691 #ifdef NFSKERB 1692 XXX 1693 #endif 1694 1695 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1696 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1697 if (nuidp->nu_expire < time.tv_sec || 1698 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1699 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1700 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1701 nuidp->nu_expire = 0; 1702 nd->nd_repstat = 1703 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1704 nd->nd_procnum = NFSPROC_NOOP; 1705 return (0); 1706 } 1707 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1708 nd->nd_flag |= ND_KERBNICK; 1709 }; 1710 } else { 1711 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1712 nd->nd_procnum = NFSPROC_NOOP; 1713 return (0); 1714 } 1715 1716 /* 1717 * For nqnfs, get piggybacked lease request. 1718 */ 1719 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1720 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1721 nd->nd_flag |= fxdr_unsigned(int, *tl); 1722 if (nd->nd_flag & ND_LEASE) { 1723 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1724 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 1725 } else 1726 nd->nd_duration = NQ_MINLEASE; 1727 } else 1728 nd->nd_duration = NQ_MINLEASE; 1729 nd->nd_md = md; 1730 nd->nd_dpos = dpos; 1731 return (0); 1732 nfsmout: 1733 return (error); 1734 } 1735 1736 int 1737 nfs_msg(p, server, msg) 1738 struct proc *p; 1739 char *server, *msg; 1740 { 1741 tpr_t tpr; 1742 1743 if (p) 1744 tpr = tprintf_open(p); 1745 else 1746 tpr = NULL; 1747 tprintf(tpr, "nfs server %s: %s\n", server, msg); 1748 tprintf_close(tpr); 1749 return (0); 1750 } 1751 1752 #ifdef NFSSERVER 1753 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 1754 struct nfssvc_sock *, struct proc *, 1755 struct mbuf **)) = { 1756 nfsrv_null, 1757 nfsrv_getattr, 1758 nfsrv_setattr, 1759 nfsrv_lookup, 1760 nfsrv3_access, 1761 nfsrv_readlink, 1762 nfsrv_read, 1763 nfsrv_write, 1764 nfsrv_create, 1765 nfsrv_mkdir, 1766 nfsrv_symlink, 1767 nfsrv_mknod, 1768 nfsrv_remove, 1769 nfsrv_rmdir, 1770 nfsrv_rename, 1771 nfsrv_link, 1772 nfsrv_readdir, 1773 nfsrv_readdirplus, 1774 nfsrv_statfs, 1775 nfsrv_fsinfo, 1776 nfsrv_pathconf, 1777 nfsrv_commit, 1778 nqnfsrv_getlease, 1779 nqnfsrv_vacated, 1780 nfsrv_noop, 1781 nfsrv_noop 1782 }; 1783 1784 /* 1785 * Socket upcall routine for the nfsd sockets. 1786 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1787 * Essentially do as much as possible non-blocking, else punt and it will 1788 * be called with M_WAIT from an nfsd. 1789 */ 1790 void 1791 nfsrv_rcv(so, arg, waitflag) 1792 struct socket *so; 1793 caddr_t arg; 1794 int waitflag; 1795 { 1796 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1797 register struct mbuf *m; 1798 struct mbuf *mp, *nam; 1799 struct uio auio; 1800 int flags, error; 1801 1802 if ((slp->ns_flag & SLP_VALID) == 0) 1803 return; 1804 #ifdef notdef 1805 /* 1806 * Define this to test for nfsds handling this under heavy load. 1807 */ 1808 if (waitflag == M_DONTWAIT) { 1809 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 1810 } 1811 #endif 1812 auio.uio_procp = NULL; 1813 if (so->so_type == SOCK_STREAM) { 1814 /* 1815 * If there are already records on the queue, defer soreceive() 1816 * to an nfsd so that there is feedback to the TCP layer that 1817 * the nfs servers are heavily loaded. 1818 */ 1819 if (slp->ns_rec && waitflag == M_DONTWAIT) { 1820 slp->ns_flag |= SLP_NEEDQ; 1821 goto dorecs; 1822 } 1823 1824 /* 1825 * Do soreceive(). 1826 */ 1827 auio.uio_resid = 1000000000; 1828 flags = MSG_DONTWAIT; 1829 error = soreceive(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 1830 if (error || mp == (struct mbuf *)0) { 1831 if (error == EWOULDBLOCK) 1832 slp->ns_flag |= SLP_NEEDQ; 1833 else 1834 slp->ns_flag |= SLP_DISCONN; 1835 goto dorecs; 1836 } 1837 m = mp; 1838 if (slp->ns_rawend) { 1839 slp->ns_rawend->m_next = m; 1840 slp->ns_cc += 1000000000 - auio.uio_resid; 1841 } else { 1842 slp->ns_raw = m; 1843 slp->ns_cc = 1000000000 - auio.uio_resid; 1844 } 1845 while (m->m_next) 1846 m = m->m_next; 1847 slp->ns_rawend = m; 1848 1849 /* 1850 * Now try and parse record(s) out of the raw stream data. 1851 */ 1852 error = nfsrv_getstream(slp, waitflag); 1853 if (error) { 1854 if (error == EPERM) 1855 slp->ns_flag |= SLP_DISCONN; 1856 else 1857 slp->ns_flag |= SLP_NEEDQ; 1858 } 1859 } else { 1860 do { 1861 auio.uio_resid = 1000000000; 1862 flags = MSG_DONTWAIT; 1863 error = soreceive(so, &nam, &auio, &mp, 1864 (struct mbuf **)0, &flags); 1865 if (mp) { 1866 if (nam) { 1867 m = nam; 1868 m->m_next = mp; 1869 } else 1870 m = mp; 1871 if (slp->ns_recend) 1872 slp->ns_recend->m_nextpkt = m; 1873 else 1874 slp->ns_rec = m; 1875 slp->ns_recend = m; 1876 m->m_nextpkt = (struct mbuf *)0; 1877 } 1878 if (error) { 1879 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 1880 && error != EWOULDBLOCK) { 1881 slp->ns_flag |= SLP_DISCONN; 1882 goto dorecs; 1883 } 1884 } 1885 } while (mp); 1886 } 1887 1888 /* 1889 * Now try and process the request records, non-blocking. 1890 */ 1891 dorecs: 1892 if (waitflag == M_DONTWAIT && 1893 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 1894 nfsrv_wakenfsd(slp); 1895 } 1896 1897 /* 1898 * Try and extract an RPC request from the mbuf data list received on a 1899 * stream socket. The "waitflag" argument indicates whether or not it 1900 * can sleep. 1901 */ 1902 int 1903 nfsrv_getstream(slp, waitflag) 1904 register struct nfssvc_sock *slp; 1905 int waitflag; 1906 { 1907 register struct mbuf *m, **mpp; 1908 register char *cp1, *cp2; 1909 register int len; 1910 struct mbuf *om, *m2, *recm = NULL; 1911 u_int32_t recmark; 1912 1913 if (slp->ns_flag & SLP_GETSTREAM) 1914 panic("nfs getstream"); 1915 slp->ns_flag |= SLP_GETSTREAM; 1916 for (;;) { 1917 if (slp->ns_reclen == 0) { 1918 if (slp->ns_cc < NFSX_UNSIGNED) { 1919 slp->ns_flag &= ~SLP_GETSTREAM; 1920 return (0); 1921 } 1922 m = slp->ns_raw; 1923 if (m->m_len >= NFSX_UNSIGNED) { 1924 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 1925 m->m_data += NFSX_UNSIGNED; 1926 m->m_len -= NFSX_UNSIGNED; 1927 } else { 1928 cp1 = (caddr_t)&recmark; 1929 cp2 = mtod(m, caddr_t); 1930 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 1931 while (m->m_len == 0) { 1932 m = m->m_next; 1933 cp2 = mtod(m, caddr_t); 1934 } 1935 *cp1++ = *cp2++; 1936 m->m_data++; 1937 m->m_len--; 1938 } 1939 } 1940 slp->ns_cc -= NFSX_UNSIGNED; 1941 recmark = ntohl(recmark); 1942 slp->ns_reclen = recmark & ~0x80000000; 1943 if (recmark & 0x80000000) 1944 slp->ns_flag |= SLP_LASTFRAG; 1945 else 1946 slp->ns_flag &= ~SLP_LASTFRAG; 1947 if (slp->ns_reclen > NFS_MAXPACKET) { 1948 slp->ns_flag &= ~SLP_GETSTREAM; 1949 return (EPERM); 1950 } 1951 } 1952 1953 /* 1954 * Now get the record part. 1955 */ 1956 if (slp->ns_cc == slp->ns_reclen) { 1957 recm = slp->ns_raw; 1958 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 1959 slp->ns_cc = slp->ns_reclen = 0; 1960 } else if (slp->ns_cc > slp->ns_reclen) { 1961 len = 0; 1962 m = slp->ns_raw; 1963 om = (struct mbuf *)0; 1964 while (len < slp->ns_reclen) { 1965 if ((len + m->m_len) > slp->ns_reclen) { 1966 size_t left = slp->ns_reclen - len; 1967 1968 MGETHDR(m2, waitflag, m->m_type); 1969 if (m2 == NULL) { 1970 slp->ns_flag &= ~SLP_GETSTREAM; 1971 return (EWOULDBLOCK); 1972 } 1973 if (left > MHLEN) { 1974 MCLGET(m2, waitflag); 1975 if (!(m2->m_flags & M_EXT)) { 1976 m_freem(m2); 1977 slp->ns_flag &= ~SLP_GETSTREAM; 1978 return (EWOULDBLOCK); 1979 } 1980 } 1981 bcopy(mtod(m, caddr_t), mtod(m2, caddr_t), 1982 left); 1983 m2->m_len = left; 1984 m->m_data += left; 1985 m->m_len -= left; 1986 if (om) { 1987 om->m_next = m2; 1988 recm = slp->ns_raw; 1989 } else 1990 recm = m2; 1991 len = slp->ns_reclen; 1992 } else if ((len + m->m_len) == slp->ns_reclen) { 1993 om = m; 1994 len += m->m_len; 1995 m = m->m_next; 1996 recm = slp->ns_raw; 1997 om->m_next = (struct mbuf *)0; 1998 } else { 1999 om = m; 2000 len += m->m_len; 2001 m = m->m_next; 2002 } 2003 } 2004 slp->ns_raw = m; 2005 slp->ns_cc -= len; 2006 slp->ns_reclen = 0; 2007 } else { 2008 slp->ns_flag &= ~SLP_GETSTREAM; 2009 return (0); 2010 } 2011 2012 /* 2013 * Accumulate the fragments into a record. 2014 */ 2015 mpp = &slp->ns_frag; 2016 while (*mpp) 2017 mpp = &((*mpp)->m_next); 2018 *mpp = recm; 2019 if (slp->ns_flag & SLP_LASTFRAG) { 2020 if (slp->ns_recend) 2021 slp->ns_recend->m_nextpkt = slp->ns_frag; 2022 else 2023 slp->ns_rec = slp->ns_frag; 2024 slp->ns_recend = slp->ns_frag; 2025 slp->ns_frag = (struct mbuf *)0; 2026 } 2027 } 2028 } 2029 2030 /* 2031 * Parse an RPC header. 2032 */ 2033 int 2034 nfsrv_dorec(slp, nfsd, ndp) 2035 register struct nfssvc_sock *slp; 2036 struct nfsd *nfsd; 2037 struct nfsrv_descript **ndp; 2038 { 2039 register struct mbuf *m, *nam; 2040 register struct nfsrv_descript *nd; 2041 int error; 2042 2043 *ndp = NULL; 2044 if ((slp->ns_flag & SLP_VALID) == 0 || 2045 (m = slp->ns_rec) == (struct mbuf *)0) 2046 return (ENOBUFS); 2047 slp->ns_rec = m->m_nextpkt; 2048 if (slp->ns_rec) 2049 m->m_nextpkt = (struct mbuf *)0; 2050 else 2051 slp->ns_recend = (struct mbuf *)0; 2052 if (m->m_type == MT_SONAME) { 2053 nam = m; 2054 m = m->m_next; 2055 nam->m_next = NULL; 2056 } else 2057 nam = NULL; 2058 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2059 M_NFSRVDESC, M_WAITOK); 2060 nd->nd_md = nd->nd_mrep = m; 2061 nd->nd_nam2 = nam; 2062 nd->nd_dpos = mtod(m, caddr_t); 2063 error = nfs_getreq(nd, nfsd, TRUE); 2064 if (error) { 2065 m_freem(nam); 2066 free((caddr_t)nd, M_NFSRVDESC); 2067 return (error); 2068 } 2069 *ndp = nd; 2070 nfsd->nfsd_nd = nd; 2071 return (0); 2072 } 2073 2074 2075 /* 2076 * Search for a sleeping nfsd and wake it up. 2077 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2078 * running nfsds will go look for the work in the nfssvc_sock list. 2079 */ 2080 void 2081 nfsrv_wakenfsd(slp) 2082 struct nfssvc_sock *slp; 2083 { 2084 register struct nfsd *nd; 2085 2086 if ((slp->ns_flag & SLP_VALID) == 0) 2087 return; 2088 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) { 2089 if (nd->nfsd_flag & NFSD_WAITING) { 2090 nd->nfsd_flag &= ~NFSD_WAITING; 2091 if (nd->nfsd_slp) 2092 panic("nfsd wakeup"); 2093 slp->ns_sref++; 2094 nd->nfsd_slp = slp; 2095 wakeup((caddr_t)nd); 2096 return; 2097 } 2098 } 2099 slp->ns_flag |= SLP_DOREC; 2100 nfsd_head_flag |= NFSD_CHECKSLP; 2101 } 2102 #endif /* NFSSERVER */ 2103