1 /* $NetBSD: nfs_socket.c,v 1.17 1994/08/17 14:43:51 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993 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 8.3 (Berkeley) 1/12/94 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 59 #include <netinet/in.h> 60 #include <netinet/tcp.h> 61 #include <nfs/rpcv2.h> 62 #include <nfs/nfsv2.h> 63 #include <nfs/nfs.h> 64 #include <nfs/xdr_subs.h> 65 #include <nfs/nfsm_subs.h> 66 #include <nfs/nfsmount.h> 67 #include <nfs/nfsnode.h> 68 #include <nfs/nfsrtt.h> 69 #include <nfs/nqnfs.h> 70 71 #define TRUE 1 72 #define FALSE 0 73 74 /* 75 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 76 * Use the mean and mean deviation of rtt for the appropriate type of rpc 77 * for the frequent rpcs and a default for the others. 78 * The justification for doing "other" this way is that these rpcs 79 * happen so infrequently that timer est. would probably be stale. 80 * Also, since many of these rpcs are 81 * non-idempotent, a conservative timeout is desired. 82 * getattr, lookup - A+2D 83 * read, write - A+4D 84 * other - nm_timeo 85 */ 86 #define NFS_RTO(n, t) \ 87 ((t) == 0 ? (n)->nm_timeo : \ 88 ((t) < 3 ? \ 89 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 90 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 91 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 92 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 93 /* 94 * External data, mostly RPC constants in XDR form 95 */ 96 extern u_long rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, rpc_auth_unix, 97 rpc_msgaccepted, rpc_call, rpc_autherr, rpc_rejectedcred, 98 rpc_auth_kerb; 99 extern u_long nfs_prog, nfs_vers, nqnfs_prog, nqnfs_vers; 100 extern time_t nqnfsstarttime; 101 extern int nonidempotent[NFS_NPROCS]; 102 103 /* 104 * Maps errno values to nfs error numbers. 105 * Use NFSERR_IO as the catch all for ones not specifically defined in 106 * RFC 1094. 107 */ 108 static int nfsrv_errmap[ELAST] = { 109 NFSERR_PERM, NFSERR_NOENT, NFSERR_IO, NFSERR_IO, NFSERR_IO, 110 NFSERR_NXIO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 111 NFSERR_IO, NFSERR_IO, NFSERR_ACCES, NFSERR_IO, NFSERR_IO, 112 NFSERR_IO, NFSERR_EXIST, NFSERR_IO, NFSERR_NODEV, NFSERR_NOTDIR, 113 NFSERR_ISDIR, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 114 NFSERR_IO, NFSERR_FBIG, NFSERR_NOSPC, NFSERR_IO, NFSERR_ROFS, 115 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 116 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 117 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 118 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 119 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 120 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 121 NFSERR_IO, NFSERR_IO, NFSERR_NAMETOL, NFSERR_IO, NFSERR_IO, 122 NFSERR_NOTEMPTY, NFSERR_IO, NFSERR_IO, NFSERR_DQUOT, NFSERR_STALE, 123 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 124 NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, NFSERR_IO, 125 NFSERR_IO, 126 }; 127 128 /* 129 * Defines which timer to use for the procnum. 130 * 0 - default 131 * 1 - getattr 132 * 2 - lookup 133 * 3 - read 134 * 4 - write 135 */ 136 static int proct[NFS_NPROCS] = { 137 0, 1, 0, 0, 2, 3, 3, 0, 4, 0, 0, 0, 0, 0, 0, 0, 3, 0, 3, 0, 0, 0, 0, 138 }; 139 140 /* 141 * There is a congestion window for outstanding rpcs maintained per mount 142 * point. The cwnd size is adjusted in roughly the way that: 143 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 144 * SIGCOMM '88". ACM, August 1988. 145 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 146 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 147 * of rpcs is in progress. 148 * (The sent count and cwnd are scaled for integer arith.) 149 * Variants of "slow start" were tried and were found to be too much of a 150 * performance hit (ave. rtt 3 times larger), 151 * I suspect due to the large rtt that nfs rpcs have. 152 */ 153 #define NFS_CWNDSCALE 256 154 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 155 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 156 int nfs_sbwait(); 157 void nfs_disconnect(), nfs_realign(), nfsrv_wakenfsd(), nfs_sndunlock(); 158 void nfs_rcvunlock(), nqnfs_serverd(), nqnfs_clientlease(); 159 struct mbuf *nfsm_rpchead(); 160 int nfsrtton = 0; 161 struct nfsrtt nfsrtt; 162 163 /* 164 * Initialize sockets and congestion for a new NFS connection. 165 * We do not free the sockaddr if error. 166 */ 167 nfs_connect(nmp, rep) 168 register struct nfsmount *nmp; 169 struct nfsreq *rep; 170 { 171 register struct socket *so; 172 int s, error, rcvreserve, sndreserve; 173 struct sockaddr *saddr; 174 struct sockaddr_in *sin; 175 struct mbuf *m; 176 u_short tport; 177 178 nmp->nm_so = (struct socket *)0; 179 saddr = mtod(nmp->nm_nam, struct sockaddr *); 180 if (error = socreate(saddr->sa_family, 181 &nmp->nm_so, nmp->nm_sotype, nmp->nm_soproto)) 182 goto bad; 183 so = nmp->nm_so; 184 nmp->nm_soflags = so->so_proto->pr_flags; 185 186 /* 187 * Some servers require that the client port be a reserved port number. 188 */ 189 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 190 MGET(m, M_WAIT, MT_SONAME); 191 sin = mtod(m, struct sockaddr_in *); 192 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 193 sin->sin_family = AF_INET; 194 sin->sin_addr.s_addr = INADDR_ANY; 195 tport = IPPORT_RESERVED - 1; 196 sin->sin_port = htons(tport); 197 while ((error = sobind(so, m)) == EADDRINUSE && 198 --tport > IPPORT_RESERVED / 2) 199 sin->sin_port = htons(tport); 200 m_freem(m); 201 if (error) 202 goto bad; 203 } 204 205 /* 206 * Protocols that do not require connections may be optionally left 207 * unconnected for servers that reply from a port other than NFS_PORT. 208 */ 209 if (nmp->nm_flag & NFSMNT_NOCONN) { 210 if (nmp->nm_soflags & PR_CONNREQUIRED) { 211 error = ENOTCONN; 212 goto bad; 213 } 214 } else { 215 if (error = soconnect(so, nmp->nm_nam)) 216 goto bad; 217 218 /* 219 * Wait for the connection to complete. Cribbed from the 220 * connect system call but with the wait timing out so 221 * that interruptible mounts don't hang here for a long time. 222 */ 223 s = splnet(); 224 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 225 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 226 "nfscon", 2 * hz); 227 if ((so->so_state & SS_ISCONNECTING) && 228 so->so_error == 0 && rep && 229 (error = nfs_sigintr(nmp, rep, rep->r_procp))) { 230 so->so_state &= ~SS_ISCONNECTING; 231 splx(s); 232 goto bad; 233 } 234 } 235 if (so->so_error) { 236 error = so->so_error; 237 so->so_error = 0; 238 splx(s); 239 goto bad; 240 } 241 splx(s); 242 } 243 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 244 so->so_rcv.sb_timeo = (5 * hz); 245 so->so_snd.sb_timeo = (5 * hz); 246 } else { 247 so->so_rcv.sb_timeo = 0; 248 so->so_snd.sb_timeo = 0; 249 } 250 if (nmp->nm_sotype == SOCK_DGRAM) { 251 sndreserve = nmp->nm_wsize + NFS_MAXPKTHDR; 252 rcvreserve = nmp->nm_rsize + NFS_MAXPKTHDR; 253 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 254 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 255 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR) * 2; 256 } else { 257 if (nmp->nm_sotype != SOCK_STREAM) 258 panic("nfscon sotype"); 259 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 260 MGET(m, M_WAIT, MT_SOOPTS); 261 *mtod(m, int *) = 1; 262 m->m_len = sizeof(int); 263 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 264 } 265 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 266 MGET(m, M_WAIT, MT_SOOPTS); 267 *mtod(m, int *) = 1; 268 m->m_len = sizeof(int); 269 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 270 } 271 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + sizeof (u_long)) 272 * 2; 273 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + sizeof (u_long)) 274 * 2; 275 } 276 if (error = soreserve(so, sndreserve, rcvreserve)) 277 goto bad; 278 so->so_rcv.sb_flags |= SB_NOINTR; 279 so->so_snd.sb_flags |= SB_NOINTR; 280 281 /* Initialize other non-zero congestion variables */ 282 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 283 nmp->nm_srtt[4] = (NFS_TIMEO << 3); 284 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 285 nmp->nm_sdrtt[3] = nmp->nm_sdrtt[4] = 0; 286 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 287 nmp->nm_sent = 0; 288 nmp->nm_timeouts = 0; 289 return (0); 290 291 bad: 292 nfs_disconnect(nmp); 293 return (error); 294 } 295 296 /* 297 * Reconnect routine: 298 * Called when a connection is broken on a reliable protocol. 299 * - clean up the old socket 300 * - nfs_connect() again 301 * - set R_MUSTRESEND for all outstanding requests on mount point 302 * If this fails the mount point is DEAD! 303 * nb: Must be called with the nfs_sndlock() set on the mount point. 304 */ 305 nfs_reconnect(rep) 306 register struct nfsreq *rep; 307 { 308 register struct nfsreq *rp; 309 register struct nfsmount *nmp = rep->r_nmp; 310 int error; 311 312 nfs_disconnect(nmp); 313 while (error = nfs_connect(nmp, rep)) { 314 if (error == EINTR || error == ERESTART) 315 return (EINTR); 316 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); 317 } 318 319 /* 320 * Loop through outstanding request list and fix up all requests 321 * on old socket. 322 */ 323 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) { 324 if (rp->r_nmp == nmp) 325 rp->r_flags |= R_MUSTRESEND; 326 } 327 return (0); 328 } 329 330 /* 331 * NFS disconnect. Clean up and unlink. 332 */ 333 void 334 nfs_disconnect(nmp) 335 register struct nfsmount *nmp; 336 { 337 register struct socket *so; 338 339 if (nmp->nm_so) { 340 so = nmp->nm_so; 341 nmp->nm_so = (struct socket *)0; 342 soshutdown(so, 2); 343 soclose(so); 344 } 345 } 346 347 /* 348 * This is the nfs send routine. For connection based socket types, it 349 * must be called with an nfs_sndlock() on the socket. 350 * "rep == NULL" indicates that it has been called from a server. 351 * For the client side: 352 * - return EINTR if the RPC is terminated, 0 otherwise 353 * - set R_MUSTRESEND if the send fails for any reason 354 * - do any cleanup required by recoverable socket errors (???) 355 * For the server side: 356 * - return EINTR or ERESTART if interrupted by a signal 357 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 358 * - do any cleanup required by recoverable socket errors (???) 359 */ 360 nfs_send(so, nam, top, rep) 361 register struct socket *so; 362 struct mbuf *nam; 363 register struct mbuf *top; 364 struct nfsreq *rep; 365 { 366 struct mbuf *sendnam; 367 int error, soflags, flags; 368 369 if (rep) { 370 if (rep->r_flags & R_SOFTTERM) { 371 m_freem(top); 372 return (EINTR); 373 } 374 if ((so = rep->r_nmp->nm_so) == NULL) { 375 rep->r_flags |= R_MUSTRESEND; 376 m_freem(top); 377 return (0); 378 } 379 rep->r_flags &= ~R_MUSTRESEND; 380 soflags = rep->r_nmp->nm_soflags; 381 } else 382 soflags = so->so_proto->pr_flags; 383 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 384 sendnam = (struct mbuf *)0; 385 else 386 sendnam = nam; 387 if (so->so_type == SOCK_SEQPACKET) 388 flags = MSG_EOR; 389 else 390 flags = 0; 391 392 error = sosend(so, sendnam, (struct uio *)0, top, 393 (struct mbuf *)0, flags); 394 if (error) { 395 if (rep) { 396 log(LOG_INFO, "nfs send error %d for server %s\n",error, 397 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 398 /* 399 * Deal with errors for the client side. 400 */ 401 if (rep->r_flags & R_SOFTTERM) 402 error = EINTR; 403 else 404 rep->r_flags |= R_MUSTRESEND; 405 } else 406 log(LOG_INFO, "nfsd send error %d\n", error); 407 408 /* 409 * Handle any recoverable (soft) socket errors here. (???) 410 */ 411 if (error != EINTR && error != ERESTART && 412 error != EWOULDBLOCK && error != EPIPE) 413 error = 0; 414 } 415 return (error); 416 } 417 418 #ifdef NFSCLIENT 419 /* 420 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 421 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 422 * Mark and consolidate the data into a new mbuf list. 423 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 424 * small mbufs. 425 * For SOCK_STREAM we must be very careful to read an entire record once 426 * we have read any of it, even if the system call has been interrupted. 427 */ 428 nfs_receive(rep, aname, mp) 429 register struct nfsreq *rep; 430 struct mbuf **aname; 431 struct mbuf **mp; 432 { 433 register struct socket *so; 434 struct uio auio; 435 struct iovec aio; 436 register struct mbuf *m; 437 struct mbuf *control; 438 u_long len; 439 struct mbuf **getnam; 440 int error, sotype, rcvflg; 441 struct proc *p = curproc; /* XXX */ 442 443 /* 444 * Set up arguments for soreceive() 445 */ 446 *mp = (struct mbuf *)0; 447 *aname = (struct mbuf *)0; 448 sotype = rep->r_nmp->nm_sotype; 449 450 /* 451 * For reliable protocols, lock against other senders/receivers 452 * in case a reconnect is necessary. 453 * For SOCK_STREAM, first get the Record Mark to find out how much 454 * more there is to get. 455 * We must lock the socket against other receivers 456 * until we have an entire rpc request/reply. 457 */ 458 if (sotype != SOCK_DGRAM) { 459 if (error = nfs_sndlock(&rep->r_nmp->nm_flag, rep)) 460 return (error); 461 tryagain: 462 /* 463 * Check for fatal errors and resending request. 464 */ 465 /* 466 * Ugh: If a reconnect attempt just happened, nm_so 467 * would have changed. NULL indicates a failed 468 * attempt that has essentially shut down this 469 * mount point. 470 */ 471 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 472 nfs_sndunlock(&rep->r_nmp->nm_flag); 473 return (EINTR); 474 } 475 if ((so = rep->r_nmp->nm_so) == NULL) { 476 if (error = nfs_reconnect(rep)) { 477 nfs_sndunlock(&rep->r_nmp->nm_flag); 478 return (error); 479 } 480 goto tryagain; 481 } 482 while (rep->r_flags & R_MUSTRESEND) { 483 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 484 nfsstats.rpcretries++; 485 if (error = nfs_send(so, rep->r_nmp->nm_nam, m, rep)) { 486 if (error == EINTR || error == ERESTART || 487 (error = nfs_reconnect(rep))) { 488 nfs_sndunlock(&rep->r_nmp->nm_flag); 489 return (error); 490 } 491 goto tryagain; 492 } 493 } 494 nfs_sndunlock(&rep->r_nmp->nm_flag); 495 if (sotype == SOCK_STREAM) { 496 aio.iov_base = (caddr_t) &len; 497 aio.iov_len = sizeof(u_long); 498 auio.uio_iov = &aio; 499 auio.uio_iovcnt = 1; 500 auio.uio_segflg = UIO_SYSSPACE; 501 auio.uio_rw = UIO_READ; 502 auio.uio_offset = 0; 503 auio.uio_resid = sizeof(u_long); 504 auio.uio_procp = p; 505 do { 506 rcvflg = MSG_WAITALL; 507 error = soreceive(so, (struct mbuf **)0, &auio, 508 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 509 if (error == EWOULDBLOCK && rep) { 510 if (rep->r_flags & R_SOFTTERM) 511 return (EINTR); 512 } 513 } while (error == EWOULDBLOCK); 514 if (!error && auio.uio_resid > 0) { 515 log(LOG_INFO, 516 "short receive (%d/%d) from nfs server %s\n", 517 sizeof(u_long) - auio.uio_resid, 518 sizeof(u_long), 519 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 520 error = EPIPE; 521 } 522 if (error) 523 goto errout; 524 len = ntohl(len) & ~0x80000000; 525 /* 526 * This is SERIOUS! We are out of sync with the sender 527 * and forcing a disconnect/reconnect is all I can do. 528 */ 529 if (len > NFS_MAXPACKET) { 530 log(LOG_ERR, "%s (%d) from nfs server %s\n", 531 "impossible packet length", 532 len, 533 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 534 error = EFBIG; 535 goto errout; 536 } 537 auio.uio_resid = len; 538 do { 539 rcvflg = MSG_WAITALL; 540 error = soreceive(so, (struct mbuf **)0, 541 &auio, mp, (struct mbuf **)0, &rcvflg); 542 } while (error == EWOULDBLOCK || error == EINTR || 543 error == ERESTART); 544 if (!error && auio.uio_resid > 0) { 545 log(LOG_INFO, 546 "short receive (%d/%d) from nfs server %s\n", 547 len - auio.uio_resid, len, 548 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 549 error = EPIPE; 550 } 551 } else { 552 /* 553 * NB: Since uio_resid is big, MSG_WAITALL is ignored 554 * and soreceive() will return when it has either a 555 * control msg or a data msg. 556 * We have no use for control msg., but must grab them 557 * and then throw them away so we know what is going 558 * on. 559 */ 560 auio.uio_resid = len = 100000000; /* Anything Big */ 561 auio.uio_procp = p; 562 do { 563 rcvflg = 0; 564 error = soreceive(so, (struct mbuf **)0, 565 &auio, mp, &control, &rcvflg); 566 if (control) 567 m_freem(control); 568 if (error == EWOULDBLOCK && rep) { 569 if (rep->r_flags & R_SOFTTERM) 570 return (EINTR); 571 } 572 } while (error == EWOULDBLOCK || 573 (!error && *mp == NULL && control)); 574 if ((rcvflg & MSG_EOR) == 0) 575 printf("Egad!!\n"); 576 if (!error && *mp == NULL) 577 error = EPIPE; 578 len -= auio.uio_resid; 579 } 580 errout: 581 if (error && error != EINTR && error != ERESTART) { 582 m_freem(*mp); 583 *mp = (struct mbuf *)0; 584 if (error != EPIPE) 585 log(LOG_INFO, 586 "receive error %d from nfs server %s\n", 587 error, 588 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 589 error = nfs_sndlock(&rep->r_nmp->nm_flag, rep); 590 if (!error) 591 error = nfs_reconnect(rep); 592 if (!error) 593 goto tryagain; 594 } 595 } else { 596 if ((so = rep->r_nmp->nm_so) == NULL) 597 return (EACCES); 598 if (so->so_state & SS_ISCONNECTED) 599 getnam = (struct mbuf **)0; 600 else 601 getnam = aname; 602 auio.uio_resid = len = 1000000; 603 auio.uio_procp = p; 604 do { 605 rcvflg = 0; 606 error = soreceive(so, getnam, &auio, mp, 607 (struct mbuf **)0, &rcvflg); 608 if (error == EWOULDBLOCK && 609 (rep->r_flags & R_SOFTTERM)) 610 return (EINTR); 611 } while (error == EWOULDBLOCK); 612 len -= auio.uio_resid; 613 } 614 if (error) { 615 m_freem(*mp); 616 *mp = (struct mbuf *)0; 617 } 618 /* 619 * Search for any mbufs that are not a multiple of 4 bytes long 620 * or with m_data not longword aligned. 621 * These could cause pointer alignment problems, so copy them to 622 * well aligned mbufs. 623 */ 624 nfs_realign(*mp, 5 * NFSX_UNSIGNED); 625 return (error); 626 } 627 628 /* 629 * Implement receipt of reply on a socket. 630 * We must search through the list of received datagrams matching them 631 * with outstanding requests using the xid, until ours is found. 632 */ 633 /* ARGSUSED */ 634 nfs_reply(myrep) 635 struct nfsreq *myrep; 636 { 637 register struct nfsreq *rep; 638 register struct nfsmount *nmp = myrep->r_nmp; 639 register long t1; 640 struct mbuf *mrep, *nam, *md; 641 u_long rxid, *tl; 642 caddr_t dpos, cp2; 643 int error; 644 645 /* 646 * Loop around until we get our own reply 647 */ 648 for (;;) { 649 /* 650 * Lock against other receivers so that I don't get stuck in 651 * sbwait() after someone else has received my reply for me. 652 * Also necessary for connection based protocols to avoid 653 * race conditions during a reconnect. 654 */ 655 if (error = nfs_rcvlock(myrep)) 656 return (error); 657 /* Already received, bye bye */ 658 if (myrep->r_mrep != NULL) { 659 nfs_rcvunlock(&nmp->nm_flag); 660 return (0); 661 } 662 /* 663 * Get the next Rpc reply off the socket 664 */ 665 error = nfs_receive(myrep, &nam, &mrep); 666 nfs_rcvunlock(&nmp->nm_flag); 667 if (error) { 668 669 /* 670 * Ignore routing errors on connectionless protocols?? 671 */ 672 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 673 nmp->nm_so->so_error = 0; 674 if (myrep->r_flags & R_GETONEREP) 675 return (0); 676 continue; 677 } 678 return (error); 679 } 680 if (nam) 681 m_freem(nam); 682 683 /* 684 * Get the xid and check that it is an rpc reply 685 */ 686 md = mrep; 687 dpos = mtod(md, caddr_t); 688 nfsm_dissect(tl, u_long *, 2*NFSX_UNSIGNED); 689 rxid = *tl++; 690 if (*tl != rpc_reply) { 691 if (nmp->nm_flag & NFSMNT_NQNFS) { 692 if (nqnfs_callback(nmp, mrep, md, dpos)) 693 nfsstats.rpcinvalid++; 694 } else { 695 nfsstats.rpcinvalid++; 696 m_freem(mrep); 697 } 698 nfsmout: 699 if (myrep->r_flags & R_GETONEREP) 700 return (0); 701 continue; 702 } 703 704 /* 705 * Loop through the request list to match up the reply 706 * Iff no match, just drop the datagram 707 */ 708 for (rep = nfs_reqq.tqh_first; rep != 0; 709 rep = rep->r_chain.tqe_next) { 710 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 711 /* Found it.. */ 712 rep->r_mrep = mrep; 713 rep->r_md = md; 714 rep->r_dpos = dpos; 715 if (nfsrtton) { 716 struct rttl *rt; 717 718 rt = &nfsrtt.rttl[nfsrtt.pos]; 719 rt->proc = rep->r_procnum; 720 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 721 rt->sent = nmp->nm_sent; 722 rt->cwnd = nmp->nm_cwnd; 723 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 724 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 725 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 726 rt->tstamp = time; 727 if (rep->r_flags & R_TIMING) 728 rt->rtt = rep->r_rtt; 729 else 730 rt->rtt = 1000000; 731 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 732 } 733 /* 734 * Update congestion window. 735 * Do the additive increase of 736 * one rpc/rtt. 737 */ 738 if (nmp->nm_cwnd <= nmp->nm_sent) { 739 nmp->nm_cwnd += 740 (NFS_CWNDSCALE * NFS_CWNDSCALE + 741 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 742 if (nmp->nm_cwnd > NFS_MAXCWND) 743 nmp->nm_cwnd = NFS_MAXCWND; 744 } 745 rep->r_flags &= ~R_SENT; 746 nmp->nm_sent -= NFS_CWNDSCALE; 747 /* 748 * Update rtt using a gain of 0.125 on the mean 749 * and a gain of 0.25 on the deviation. 750 */ 751 if (rep->r_flags & R_TIMING) { 752 /* 753 * Since the timer resolution of 754 * NFS_HZ is so course, it can often 755 * result in r_rtt == 0. Since 756 * r_rtt == N means that the actual 757 * rtt is between N+dt and N+2-dt ticks, 758 * add 1. 759 */ 760 t1 = rep->r_rtt + 1; 761 t1 -= (NFS_SRTT(rep) >> 3); 762 NFS_SRTT(rep) += t1; 763 if (t1 < 0) 764 t1 = -t1; 765 t1 -= (NFS_SDRTT(rep) >> 2); 766 NFS_SDRTT(rep) += t1; 767 } 768 nmp->nm_timeouts = 0; 769 break; 770 } 771 } 772 /* 773 * If not matched to a request, drop it. 774 * If it's mine, get out. 775 */ 776 if (rep == 0) { 777 nfsstats.rpcunexpected++; 778 m_freem(mrep); 779 } else if (rep == myrep) { 780 if (rep->r_mrep == NULL) 781 panic("nfsreply nil"); 782 return (0); 783 } 784 if (myrep->r_flags & R_GETONEREP) 785 return (0); 786 } 787 } 788 789 /* 790 * nfs_request - goes something like this 791 * - fill in request struct 792 * - links it into list 793 * - calls nfs_send() for first transmit 794 * - calls nfs_receive() to get reply 795 * - break down rpc header and return with nfs reply pointed to 796 * by mrep or error 797 * nb: always frees up mreq mbuf list 798 */ 799 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp) 800 struct vnode *vp; 801 struct mbuf *mrest; 802 int procnum; 803 struct proc *procp; 804 struct ucred *cred; 805 struct mbuf **mrp; 806 struct mbuf **mdp; 807 caddr_t *dposp; 808 { 809 register struct mbuf *m, *mrep; 810 register struct nfsreq *rep; 811 register u_long *tl; 812 register int i; 813 struct nfsmount *nmp; 814 struct mbuf *md, *mheadend; 815 struct nfsreq *reph; 816 struct nfsnode *np; 817 time_t reqtime, waituntil; 818 caddr_t dpos, cp2; 819 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type; 820 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 821 u_long xid; 822 u_quad_t frev; 823 char *auth_str; 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 auth_str = (char *)0; 844 if (nmp->nm_flag & NFSMNT_KERB) { 845 if (failed_auth) { 846 error = nfs_getauth(nmp, rep, cred, &auth_type, 847 &auth_str, &auth_len); 848 if (error) { 849 free((caddr_t)rep, M_NFSREQ); 850 m_freem(mrest); 851 return (error); 852 } 853 } else { 854 auth_type = RPCAUTH_UNIX; 855 auth_len = 5 * NFSX_UNSIGNED; 856 } 857 } else { 858 auth_type = RPCAUTH_UNIX; 859 if (cred->cr_ngroups < 1) 860 panic("nfsreq nogrps"); 861 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 862 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 863 5 * NFSX_UNSIGNED; 864 } 865 m = nfsm_rpchead(cred, (nmp->nm_flag & NFSMNT_NQNFS), procnum, 866 auth_type, auth_len, auth_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_long *) = 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 = splsoftclock(); 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_flag, 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_flag); 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 = splsoftclock(); 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_long *, 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 (*tl == rpc_rejectedcred && failed_auth == 0) { 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 * skip over the auth_verf, someday we may want to cache auth_short's 995 * for nfs_reqhead(), but for now just dump it 996 */ 997 if (*++tl != 0) { 998 i = nfsm_rndup(fxdr_unsigned(long, *tl)); 999 nfsm_adv(i); 1000 } 1001 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1002 /* 0 == ok */ 1003 if (*tl == 0) { 1004 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1005 if (*tl != 0) { 1006 error = fxdr_unsigned(int, *tl); 1007 m_freem(mrep); 1008 if ((nmp->nm_flag & NFSMNT_NQNFS) && 1009 error == NQNFS_TRYLATER) { 1010 error = 0; 1011 waituntil = time.tv_sec + trylater_delay; 1012 while (time.tv_sec < waituntil) 1013 (void) tsleep((caddr_t)&lbolt, 1014 PSOCK, "nqnfstry", 0); 1015 trylater_delay *= nfs_backoff[trylater_cnt]; 1016 if (trylater_cnt < 7) 1017 trylater_cnt++; 1018 goto tryagain; 1019 } 1020 1021 /* 1022 * If the File Handle was stale, invalidate the 1023 * lookup cache, just in case. 1024 */ 1025 if (error == ESTALE) 1026 cache_purge(vp); 1027 m_freem(rep->r_mreq); 1028 free((caddr_t)rep, M_NFSREQ); 1029 return (error); 1030 } 1031 1032 /* 1033 * For nqnfs, get any lease in reply 1034 */ 1035 if (nmp->nm_flag & NFSMNT_NQNFS) { 1036 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1037 if (*tl) { 1038 np = VTONFS(vp); 1039 nqlflag = fxdr_unsigned(int, *tl); 1040 nfsm_dissect(tl, u_long *, 4*NFSX_UNSIGNED); 1041 cachable = fxdr_unsigned(int, *tl++); 1042 reqtime += fxdr_unsigned(int, *tl++); 1043 if (reqtime > time.tv_sec) { 1044 fxdr_hyper(tl, &frev); 1045 nqnfs_clientlease(nmp, np, nqlflag, 1046 cachable, reqtime, frev); 1047 } 1048 } 1049 } 1050 *mrp = mrep; 1051 *mdp = md; 1052 *dposp = dpos; 1053 m_freem(rep->r_mreq); 1054 FREE((caddr_t)rep, M_NFSREQ); 1055 return (0); 1056 } 1057 m_freem(mrep); 1058 m_freem(rep->r_mreq); 1059 free((caddr_t)rep, M_NFSREQ); 1060 error = EPROTONOSUPPORT; 1061 nfsmout: 1062 return (error); 1063 } 1064 #endif /* NFSCLIENT */ 1065 1066 /* 1067 * Generate the rpc reply header 1068 * siz arg. is used to decide if adding a cluster is worthwhile 1069 */ 1070 nfs_rephead(siz, nd, err, cache, frev, mrq, mbp, bposp) 1071 int siz; 1072 struct nfsd *nd; 1073 int err; 1074 int cache; 1075 u_quad_t *frev; 1076 struct mbuf **mrq; 1077 struct mbuf **mbp; 1078 caddr_t *bposp; 1079 { 1080 register u_long *tl; 1081 register struct mbuf *mreq; 1082 caddr_t bpos; 1083 struct mbuf *mb, *mb2; 1084 1085 MGETHDR(mreq, M_WAIT, MT_DATA); 1086 mb = mreq; 1087 /* 1088 * If this is a big reply, use a cluster else 1089 * try and leave leading space for the lower level headers. 1090 */ 1091 siz += RPC_REPLYSIZ; 1092 if (siz >= MINCLSIZE) { 1093 MCLGET(mreq, M_WAIT); 1094 } else 1095 mreq->m_data += max_hdr; 1096 tl = mtod(mreq, u_long *); 1097 mreq->m_len = 6*NFSX_UNSIGNED; 1098 bpos = ((caddr_t)tl)+mreq->m_len; 1099 *tl++ = txdr_unsigned(nd->nd_retxid); 1100 *tl++ = rpc_reply; 1101 if (err == ERPCMISMATCH || err == NQNFS_AUTHERR) { 1102 *tl++ = rpc_msgdenied; 1103 if (err == NQNFS_AUTHERR) { 1104 *tl++ = rpc_autherr; 1105 *tl = rpc_rejectedcred; 1106 mreq->m_len -= NFSX_UNSIGNED; 1107 bpos -= NFSX_UNSIGNED; 1108 } else { 1109 *tl++ = rpc_mismatch; 1110 *tl++ = txdr_unsigned(2); 1111 *tl = txdr_unsigned(2); 1112 } 1113 } else { 1114 *tl++ = rpc_msgaccepted; 1115 *tl++ = 0; 1116 *tl++ = 0; 1117 switch (err) { 1118 case EPROGUNAVAIL: 1119 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1120 break; 1121 case EPROGMISMATCH: 1122 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1123 nfsm_build(tl, u_long *, 2*NFSX_UNSIGNED); 1124 *tl++ = txdr_unsigned(2); 1125 *tl = txdr_unsigned(2); /* someday 3 */ 1126 break; 1127 case EPROCUNAVAIL: 1128 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1129 break; 1130 default: 1131 *tl = 0; 1132 if (err != VNOVAL) { 1133 nfsm_build(tl, u_long *, NFSX_UNSIGNED); 1134 if (err) 1135 *tl = txdr_unsigned(nfsrv_errmap[err - 1]); 1136 else 1137 *tl = 0; 1138 } 1139 break; 1140 }; 1141 } 1142 1143 /* 1144 * For nqnfs, piggyback lease as requested. 1145 */ 1146 if (nd->nd_nqlflag != NQL_NOVAL && err == 0) { 1147 if (nd->nd_nqlflag) { 1148 nfsm_build(tl, u_long *, 5*NFSX_UNSIGNED); 1149 *tl++ = txdr_unsigned(nd->nd_nqlflag); 1150 *tl++ = txdr_unsigned(cache); 1151 *tl++ = txdr_unsigned(nd->nd_duration); 1152 txdr_hyper(frev, tl); 1153 } else { 1154 if (nd->nd_nqlflag != 0) 1155 panic("nqreph"); 1156 nfsm_build(tl, u_long *, NFSX_UNSIGNED); 1157 *tl = 0; 1158 } 1159 } 1160 *mrq = mreq; 1161 *mbp = mb; 1162 *bposp = bpos; 1163 if (err != 0 && err != VNOVAL) 1164 nfsstats.srvrpc_errs++; 1165 return (0); 1166 } 1167 1168 /* 1169 * Nfs timer routine 1170 * Scan the nfsreq list and retranmit any requests that have timed out 1171 * To avoid retransmission attempts on STREAM sockets (in the future) make 1172 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1173 */ 1174 void 1175 nfs_timer(arg) 1176 void *arg; 1177 { 1178 register struct nfsreq *rep; 1179 register struct mbuf *m; 1180 register struct socket *so; 1181 register struct nfsmount *nmp; 1182 register int timeo; 1183 static long lasttime = 0; 1184 int s, error; 1185 1186 s = splnet(); 1187 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) { 1188 nmp = rep->r_nmp; 1189 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1190 continue; 1191 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1192 rep->r_flags |= R_SOFTTERM; 1193 continue; 1194 } 1195 if (rep->r_rtt >= 0) { 1196 rep->r_rtt++; 1197 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1198 timeo = nmp->nm_timeo; 1199 else 1200 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1201 if (nmp->nm_timeouts > 0) 1202 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1203 if (rep->r_rtt <= timeo) 1204 continue; 1205 if (nmp->nm_timeouts < 8) 1206 nmp->nm_timeouts++; 1207 } 1208 /* 1209 * Check for server not responding 1210 */ 1211 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1212 rep->r_rexmit > nmp->nm_deadthresh) { 1213 nfs_msg(rep->r_procp, 1214 nmp->nm_mountp->mnt_stat.f_mntfromname, 1215 "not responding"); 1216 rep->r_flags |= R_TPRINTFMSG; 1217 } 1218 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1219 nfsstats.rpctimeouts++; 1220 rep->r_flags |= R_SOFTTERM; 1221 continue; 1222 } 1223 if (nmp->nm_sotype != SOCK_DGRAM) { 1224 if (++rep->r_rexmit > NFS_MAXREXMIT) 1225 rep->r_rexmit = NFS_MAXREXMIT; 1226 continue; 1227 } 1228 if ((so = nmp->nm_so) == NULL) 1229 continue; 1230 1231 /* 1232 * If there is enough space and the window allows.. 1233 * Resend it 1234 * Set r_rtt to -1 in case we fail to send it now. 1235 */ 1236 rep->r_rtt = -1; 1237 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1238 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1239 (rep->r_flags & R_SENT) || 1240 nmp->nm_sent < nmp->nm_cwnd) && 1241 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1242 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1243 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1244 (struct mbuf *)0, (struct mbuf *)0); 1245 else 1246 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1247 nmp->nm_nam, (struct mbuf *)0); 1248 if (error) { 1249 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1250 so->so_error = 0; 1251 } else { 1252 /* 1253 * Iff first send, start timing 1254 * else turn timing off, backoff timer 1255 * and divide congestion window by 2. 1256 */ 1257 if (rep->r_flags & R_SENT) { 1258 rep->r_flags &= ~R_TIMING; 1259 if (++rep->r_rexmit > NFS_MAXREXMIT) 1260 rep->r_rexmit = NFS_MAXREXMIT; 1261 nmp->nm_cwnd >>= 1; 1262 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1263 nmp->nm_cwnd = NFS_CWNDSCALE; 1264 nfsstats.rpcretries++; 1265 } else { 1266 rep->r_flags |= R_SENT; 1267 nmp->nm_sent += NFS_CWNDSCALE; 1268 } 1269 rep->r_rtt = 0; 1270 } 1271 } 1272 } 1273 1274 #ifdef NFSSERVER 1275 /* 1276 * Call the nqnfs server timer once a second to handle leases. 1277 */ 1278 if (lasttime != time.tv_sec) { 1279 lasttime = time.tv_sec; 1280 nqnfs_serverd(); 1281 } 1282 #endif /* NFSSERVER */ 1283 splx(s); 1284 timeout(nfs_timer, (void *)0, hz / NFS_HZ); 1285 } 1286 1287 /* 1288 * Test for a termination condition pending on the process. 1289 * This is used for NFSMNT_INT mounts. 1290 */ 1291 nfs_sigintr(nmp, rep, p) 1292 struct nfsmount *nmp; 1293 struct nfsreq *rep; 1294 register struct proc *p; 1295 { 1296 1297 if (rep && (rep->r_flags & R_SOFTTERM)) 1298 return (EINTR); 1299 if (!(nmp->nm_flag & NFSMNT_INT)) 1300 return (0); 1301 if (p && p->p_siglist && 1302 (((p->p_siglist & ~p->p_sigmask) & ~p->p_sigignore) & 1303 NFSINT_SIGMASK)) 1304 return (EINTR); 1305 return (0); 1306 } 1307 1308 /* 1309 * Lock a socket against others. 1310 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1311 * and also to avoid race conditions between the processes with nfs requests 1312 * in progress when a reconnect is necessary. 1313 */ 1314 nfs_sndlock(flagp, rep) 1315 register int *flagp; 1316 struct nfsreq *rep; 1317 { 1318 struct proc *p; 1319 int slpflag = 0, slptimeo = 0; 1320 1321 if (rep) { 1322 p = rep->r_procp; 1323 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1324 slpflag = PCATCH; 1325 } else 1326 p = (struct proc *)0; 1327 while (*flagp & NFSMNT_SNDLOCK) { 1328 if (nfs_sigintr(rep->r_nmp, rep, p)) 1329 return (EINTR); 1330 *flagp |= NFSMNT_WANTSND; 1331 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1332 slptimeo); 1333 if (slpflag == PCATCH) { 1334 slpflag = 0; 1335 slptimeo = 2 * hz; 1336 } 1337 } 1338 *flagp |= NFSMNT_SNDLOCK; 1339 return (0); 1340 } 1341 1342 /* 1343 * Unlock the stream socket for others. 1344 */ 1345 void 1346 nfs_sndunlock(flagp) 1347 register int *flagp; 1348 { 1349 1350 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1351 panic("nfs sndunlock"); 1352 *flagp &= ~NFSMNT_SNDLOCK; 1353 if (*flagp & NFSMNT_WANTSND) { 1354 *flagp &= ~NFSMNT_WANTSND; 1355 wakeup((caddr_t)flagp); 1356 } 1357 } 1358 1359 nfs_rcvlock(rep) 1360 register struct nfsreq *rep; 1361 { 1362 register int *flagp = &rep->r_nmp->nm_flag; 1363 int slpflag, slptimeo = 0; 1364 1365 if (*flagp & NFSMNT_INT) 1366 slpflag = PCATCH; 1367 else 1368 slpflag = 0; 1369 while (*flagp & NFSMNT_RCVLOCK) { 1370 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1371 return (EINTR); 1372 *flagp |= NFSMNT_WANTRCV; 1373 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1374 slptimeo); 1375 if (slpflag == PCATCH) { 1376 slpflag = 0; 1377 slptimeo = 2 * hz; 1378 } 1379 } 1380 *flagp |= NFSMNT_RCVLOCK; 1381 return (0); 1382 } 1383 1384 /* 1385 * Unlock the stream socket for others. 1386 */ 1387 void 1388 nfs_rcvunlock(flagp) 1389 register int *flagp; 1390 { 1391 1392 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1393 panic("nfs rcvunlock"); 1394 *flagp &= ~NFSMNT_RCVLOCK; 1395 if (*flagp & NFSMNT_WANTRCV) { 1396 *flagp &= ~NFSMNT_WANTRCV; 1397 wakeup((caddr_t)flagp); 1398 } 1399 } 1400 1401 /* 1402 * Check for badly aligned mbuf data areas and 1403 * realign data in an mbuf list by copying the data areas up, as required. 1404 */ 1405 void 1406 nfs_realign(m, hsiz) 1407 register struct mbuf *m; 1408 int hsiz; 1409 { 1410 register struct mbuf *m2; 1411 register int siz, mlen, olen; 1412 register caddr_t tcp, fcp; 1413 struct mbuf *mnew; 1414 1415 while (m) { 1416 /* 1417 * This never happens for UDP, rarely happens for TCP 1418 * but frequently happens for iso transport. 1419 */ 1420 if ((m->m_len & 0x3) || (mtod(m, int) & 0x3)) { 1421 olen = m->m_len; 1422 fcp = mtod(m, caddr_t); 1423 if ((int)fcp & 0x3) { 1424 m->m_flags &= ~M_PKTHDR; 1425 if (m->m_flags & M_EXT) 1426 m->m_data = m->m_ext.ext_buf + 1427 ((m->m_ext.ext_size - olen) & ~0x3); 1428 else 1429 m->m_data = m->m_dat; 1430 } 1431 m->m_len = 0; 1432 tcp = mtod(m, caddr_t); 1433 mnew = m; 1434 m2 = m->m_next; 1435 1436 /* 1437 * If possible, only put the first invariant part 1438 * of the RPC header in the first mbuf. 1439 */ 1440 mlen = M_TRAILINGSPACE(m); 1441 if (olen <= hsiz && mlen > hsiz) 1442 mlen = hsiz; 1443 1444 /* 1445 * Loop through the mbuf list consolidating data. 1446 */ 1447 while (m) { 1448 while (olen > 0) { 1449 if (mlen == 0) { 1450 m2->m_flags &= ~M_PKTHDR; 1451 if (m2->m_flags & M_EXT) 1452 m2->m_data = m2->m_ext.ext_buf; 1453 else 1454 m2->m_data = m2->m_dat; 1455 m2->m_len = 0; 1456 mlen = M_TRAILINGSPACE(m2); 1457 tcp = mtod(m2, caddr_t); 1458 mnew = m2; 1459 m2 = m2->m_next; 1460 } 1461 siz = min(mlen, olen); 1462 if (tcp != fcp) 1463 bcopy(fcp, tcp, siz); 1464 mnew->m_len += siz; 1465 mlen -= siz; 1466 olen -= siz; 1467 tcp += siz; 1468 fcp += siz; 1469 } 1470 m = m->m_next; 1471 if (m) { 1472 olen = m->m_len; 1473 fcp = mtod(m, caddr_t); 1474 } 1475 } 1476 1477 /* 1478 * Finally, set m_len == 0 for any trailing mbufs that have 1479 * been copied out of. 1480 */ 1481 while (m2) { 1482 m2->m_len = 0; 1483 m2 = m2->m_next; 1484 } 1485 return; 1486 } 1487 m = m->m_next; 1488 } 1489 } 1490 1491 /* 1492 * Parse an RPC request 1493 * - verify it 1494 * - fill in the cred struct. 1495 */ 1496 nfs_getreq(nd, has_header) 1497 register struct nfsd *nd; 1498 int has_header; 1499 { 1500 register int len, i; 1501 register u_long *tl; 1502 register long t1; 1503 struct uio uio; 1504 struct iovec iov; 1505 caddr_t dpos, cp2; 1506 u_long nfsvers, auth_type; 1507 int error = 0, nqnfs = 0; 1508 struct mbuf *mrep, *md; 1509 1510 mrep = nd->nd_mrep; 1511 md = nd->nd_md; 1512 dpos = nd->nd_dpos; 1513 if (has_header) { 1514 nfsm_dissect(tl, u_long *, 10*NFSX_UNSIGNED); 1515 nd->nd_retxid = fxdr_unsigned(u_long, *tl++); 1516 if (*tl++ != rpc_call) { 1517 m_freem(mrep); 1518 return (EBADRPC); 1519 } 1520 } else { 1521 nfsm_dissect(tl, u_long *, 8*NFSX_UNSIGNED); 1522 } 1523 nd->nd_repstat = 0; 1524 if (*tl++ != rpc_vers) { 1525 nd->nd_repstat = ERPCMISMATCH; 1526 nd->nd_procnum = NFSPROC_NOOP; 1527 return (0); 1528 } 1529 nfsvers = nfs_vers; 1530 if (*tl != nfs_prog) { 1531 if (*tl == nqnfs_prog) { 1532 nqnfs++; 1533 nfsvers = nqnfs_vers; 1534 } else { 1535 nd->nd_repstat = EPROGUNAVAIL; 1536 nd->nd_procnum = NFSPROC_NOOP; 1537 return (0); 1538 } 1539 } 1540 tl++; 1541 if (*tl++ != nfsvers) { 1542 nd->nd_repstat = EPROGMISMATCH; 1543 nd->nd_procnum = NFSPROC_NOOP; 1544 return (0); 1545 } 1546 nd->nd_procnum = fxdr_unsigned(u_long, *tl++); 1547 if (nd->nd_procnum == NFSPROC_NULL) 1548 return (0); 1549 if (nd->nd_procnum >= NFS_NPROCS || 1550 (!nqnfs && nd->nd_procnum > NFSPROC_STATFS) || 1551 (*tl != rpc_auth_unix && *tl != rpc_auth_kerb)) { 1552 nd->nd_repstat = EPROCUNAVAIL; 1553 nd->nd_procnum = NFSPROC_NOOP; 1554 return (0); 1555 } 1556 auth_type = *tl++; 1557 len = fxdr_unsigned(int, *tl++); 1558 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1559 m_freem(mrep); 1560 return (EBADRPC); 1561 } 1562 1563 /* 1564 * Handle auth_unix or auth_kerb. 1565 */ 1566 if (auth_type == rpc_auth_unix) { 1567 len = fxdr_unsigned(int, *++tl); 1568 if (len < 0 || len > NFS_MAXNAMLEN) { 1569 m_freem(mrep); 1570 return (EBADRPC); 1571 } 1572 nfsm_adv(nfsm_rndup(len)); 1573 nfsm_dissect(tl, u_long *, 3*NFSX_UNSIGNED); 1574 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1575 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1576 len = fxdr_unsigned(int, *tl); 1577 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1578 m_freem(mrep); 1579 return (EBADRPC); 1580 } 1581 nfsm_dissect(tl, u_long *, (len + 2)*NFSX_UNSIGNED); 1582 for (i = 1; i <= len; i++) 1583 if (i < NGROUPS) 1584 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1585 else 1586 tl++; 1587 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 1588 } else if (auth_type == rpc_auth_kerb) { 1589 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1590 nd->nd_authlen = fxdr_unsigned(int, *tl); 1591 uio.uio_resid = nfsm_rndup(nd->nd_authlen); 1592 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1593 m_freem(mrep); 1594 return (EBADRPC); 1595 } 1596 uio.uio_offset = 0; 1597 uio.uio_iov = &iov; 1598 uio.uio_iovcnt = 1; 1599 uio.uio_segflg = UIO_SYSSPACE; 1600 iov.iov_base = (caddr_t)nd->nd_authstr; 1601 iov.iov_len = RPCAUTH_MAXSIZ; 1602 nfsm_mtouio(&uio, uio.uio_resid); 1603 nfsm_dissect(tl, u_long *, 2 * NFSX_UNSIGNED); 1604 nd->nd_flag |= NFSD_NEEDAUTH; 1605 } 1606 1607 /* 1608 * Do we have any use for the verifier. 1609 * According to the "Remote Procedure Call Protocol Spec." it 1610 * should be AUTH_NULL, but some clients make it AUTH_UNIX? 1611 * For now, just skip over it 1612 */ 1613 len = fxdr_unsigned(int, *++tl); 1614 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1615 m_freem(mrep); 1616 return (EBADRPC); 1617 } 1618 if (len > 0) { 1619 nfsm_adv(nfsm_rndup(len)); 1620 } 1621 1622 /* 1623 * For nqnfs, get piggybacked lease request. 1624 */ 1625 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1626 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1627 nd->nd_nqlflag = fxdr_unsigned(int, *tl); 1628 if (nd->nd_nqlflag) { 1629 nfsm_dissect(tl, u_long *, NFSX_UNSIGNED); 1630 nd->nd_duration = fxdr_unsigned(int, *tl); 1631 } else 1632 nd->nd_duration = NQ_MINLEASE; 1633 } else { 1634 nd->nd_nqlflag = NQL_NOVAL; 1635 nd->nd_duration = NQ_MINLEASE; 1636 } 1637 nd->nd_md = md; 1638 nd->nd_dpos = dpos; 1639 return (0); 1640 nfsmout: 1641 return (error); 1642 } 1643 1644 nfs_msg(p, server, msg) 1645 struct proc *p; 1646 char *server, *msg; 1647 { 1648 tpr_t tpr; 1649 1650 if (p) 1651 tpr = tprintf_open(p); 1652 else 1653 tpr = NULL; 1654 tprintf(tpr, "nfs server %s: %s\n", server, msg); 1655 tprintf_close(tpr); 1656 } 1657 1658 #ifdef NFSSERVER 1659 int nfsrv_null(), 1660 nfsrv_getattr(), 1661 nfsrv_setattr(), 1662 nfsrv_lookup(), 1663 nfsrv_readlink(), 1664 nfsrv_read(), 1665 nfsrv_write(), 1666 nfsrv_create(), 1667 nfsrv_remove(), 1668 nfsrv_rename(), 1669 nfsrv_link(), 1670 nfsrv_symlink(), 1671 nfsrv_mkdir(), 1672 nfsrv_rmdir(), 1673 nfsrv_readdir(), 1674 nfsrv_statfs(), 1675 nfsrv_noop(), 1676 nqnfsrv_readdirlook(), 1677 nqnfsrv_getlease(), 1678 nqnfsrv_vacated(), 1679 nqnfsrv_access(); 1680 1681 int (*nfsrv_procs[NFS_NPROCS])() = { 1682 nfsrv_null, 1683 nfsrv_getattr, 1684 nfsrv_setattr, 1685 nfsrv_noop, 1686 nfsrv_lookup, 1687 nfsrv_readlink, 1688 nfsrv_read, 1689 nfsrv_noop, 1690 nfsrv_write, 1691 nfsrv_create, 1692 nfsrv_remove, 1693 nfsrv_rename, 1694 nfsrv_link, 1695 nfsrv_symlink, 1696 nfsrv_mkdir, 1697 nfsrv_rmdir, 1698 nfsrv_readdir, 1699 nfsrv_statfs, 1700 nqnfsrv_readdirlook, 1701 nqnfsrv_getlease, 1702 nqnfsrv_vacated, 1703 nfsrv_noop, 1704 nqnfsrv_access, 1705 }; 1706 1707 /* 1708 * Socket upcall routine for the nfsd sockets. 1709 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 1710 * Essentially do as much as possible non-blocking, else punt and it will 1711 * be called with M_WAIT from an nfsd. 1712 */ 1713 void 1714 nfsrv_rcv(so, arg, waitflag) 1715 struct socket *so; 1716 caddr_t arg; 1717 int waitflag; 1718 { 1719 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 1720 register struct mbuf *m; 1721 struct mbuf *mp, *nam; 1722 struct uio auio; 1723 int flags, error; 1724 1725 if ((slp->ns_flag & SLP_VALID) == 0) 1726 return; 1727 #ifdef notdef 1728 /* 1729 * Define this to test for nfsds handling this under heavy load. 1730 */ 1731 if (waitflag == M_DONTWAIT) { 1732 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 1733 } 1734 #endif 1735 auio.uio_procp = NULL; 1736 if (so->so_type == SOCK_STREAM) { 1737 /* 1738 * If there are already records on the queue, defer soreceive() 1739 * to an nfsd so that there is feedback to the TCP layer that 1740 * the nfs servers are heavily loaded. 1741 */ 1742 if (slp->ns_rec && waitflag == M_DONTWAIT) { 1743 slp->ns_flag |= SLP_NEEDQ; 1744 goto dorecs; 1745 } 1746 1747 /* 1748 * Do soreceive(). 1749 */ 1750 auio.uio_resid = 1000000000; 1751 flags = MSG_DONTWAIT; 1752 error = soreceive(so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 1753 if (error || mp == (struct mbuf *)0) { 1754 if (error == EWOULDBLOCK) 1755 slp->ns_flag |= SLP_NEEDQ; 1756 else 1757 slp->ns_flag |= SLP_DISCONN; 1758 goto dorecs; 1759 } 1760 m = mp; 1761 if (slp->ns_rawend) { 1762 slp->ns_rawend->m_next = m; 1763 slp->ns_cc += 1000000000 - auio.uio_resid; 1764 } else { 1765 slp->ns_raw = m; 1766 slp->ns_cc = 1000000000 - auio.uio_resid; 1767 } 1768 while (m->m_next) 1769 m = m->m_next; 1770 slp->ns_rawend = m; 1771 1772 /* 1773 * Now try and parse record(s) out of the raw stream data. 1774 */ 1775 if (error = nfsrv_getstream(slp, waitflag)) { 1776 if (error == EPERM) 1777 slp->ns_flag |= SLP_DISCONN; 1778 else 1779 slp->ns_flag |= SLP_NEEDQ; 1780 } 1781 } else { 1782 do { 1783 auio.uio_resid = 1000000000; 1784 flags = MSG_DONTWAIT; 1785 error = soreceive(so, &nam, &auio, &mp, 1786 (struct mbuf **)0, &flags); 1787 if (mp) { 1788 nfs_realign(mp, 10 * NFSX_UNSIGNED); 1789 if (nam) { 1790 m = nam; 1791 m->m_next = mp; 1792 } else 1793 m = mp; 1794 if (slp->ns_recend) 1795 slp->ns_recend->m_nextpkt = m; 1796 else 1797 slp->ns_rec = m; 1798 slp->ns_recend = m; 1799 m->m_nextpkt = (struct mbuf *)0; 1800 } 1801 if (error) { 1802 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 1803 && error != EWOULDBLOCK) { 1804 slp->ns_flag |= SLP_DISCONN; 1805 goto dorecs; 1806 } 1807 } 1808 } while (mp); 1809 } 1810 1811 /* 1812 * Now try and process the request records, non-blocking. 1813 */ 1814 dorecs: 1815 if (waitflag == M_DONTWAIT && 1816 (slp->ns_rec || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 1817 nfsrv_wakenfsd(slp); 1818 } 1819 1820 /* 1821 * Try and extract an RPC request from the mbuf data list received on a 1822 * stream socket. The "waitflag" argument indicates whether or not it 1823 * can sleep. 1824 */ 1825 nfsrv_getstream(slp, waitflag) 1826 register struct nfssvc_sock *slp; 1827 int waitflag; 1828 { 1829 register struct mbuf *m; 1830 register char *cp1, *cp2; 1831 register int len; 1832 struct mbuf *om, *m2, *recm; 1833 u_long recmark; 1834 1835 if (slp->ns_flag & SLP_GETSTREAM) 1836 panic("nfs getstream"); 1837 slp->ns_flag |= SLP_GETSTREAM; 1838 for (;;) { 1839 if (slp->ns_reclen == 0) { 1840 if (slp->ns_cc < NFSX_UNSIGNED) { 1841 slp->ns_flag &= ~SLP_GETSTREAM; 1842 return (0); 1843 } 1844 m = slp->ns_raw; 1845 if (m->m_len >= NFSX_UNSIGNED) { 1846 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 1847 m->m_data += NFSX_UNSIGNED; 1848 m->m_len -= NFSX_UNSIGNED; 1849 } else { 1850 cp1 = (caddr_t)&recmark; 1851 cp2 = mtod(m, caddr_t); 1852 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 1853 while (m->m_len == 0) { 1854 m = m->m_next; 1855 cp2 = mtod(m, caddr_t); 1856 } 1857 *cp1++ = *cp2++; 1858 m->m_data++; 1859 m->m_len--; 1860 } 1861 } 1862 slp->ns_cc -= NFSX_UNSIGNED; 1863 slp->ns_reclen = ntohl(recmark) & ~0x80000000; 1864 if (slp->ns_reclen < NFS_MINPACKET || slp->ns_reclen > NFS_MAXPACKET) { 1865 slp->ns_flag &= ~SLP_GETSTREAM; 1866 return (EPERM); 1867 } 1868 } 1869 1870 /* 1871 * Now get the record part. 1872 */ 1873 if (slp->ns_cc == slp->ns_reclen) { 1874 recm = slp->ns_raw; 1875 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 1876 slp->ns_cc = slp->ns_reclen = 0; 1877 } else if (slp->ns_cc > slp->ns_reclen) { 1878 len = 0; 1879 m = slp->ns_raw; 1880 om = (struct mbuf *)0; 1881 while (len < slp->ns_reclen) { 1882 if ((len + m->m_len) > slp->ns_reclen) { 1883 m2 = m_copym(m, 0, slp->ns_reclen - len, 1884 waitflag); 1885 if (m2) { 1886 if (om) { 1887 om->m_next = m2; 1888 recm = slp->ns_raw; 1889 } else 1890 recm = m2; 1891 m->m_data += slp->ns_reclen - len; 1892 m->m_len -= slp->ns_reclen - len; 1893 len = slp->ns_reclen; 1894 } else { 1895 slp->ns_flag &= ~SLP_GETSTREAM; 1896 return (EWOULDBLOCK); 1897 } 1898 } else if ((len + m->m_len) == slp->ns_reclen) { 1899 om = m; 1900 len += m->m_len; 1901 m = m->m_next; 1902 recm = slp->ns_raw; 1903 om->m_next = (struct mbuf *)0; 1904 } else { 1905 om = m; 1906 len += m->m_len; 1907 m = m->m_next; 1908 } 1909 } 1910 slp->ns_raw = m; 1911 slp->ns_cc -= len; 1912 slp->ns_reclen = 0; 1913 } else { 1914 slp->ns_flag &= ~SLP_GETSTREAM; 1915 return (0); 1916 } 1917 nfs_realign(recm, 10 * NFSX_UNSIGNED); 1918 if (slp->ns_recend) 1919 slp->ns_recend->m_nextpkt = recm; 1920 else 1921 slp->ns_rec = recm; 1922 slp->ns_recend = recm; 1923 } 1924 } 1925 1926 /* 1927 * Parse an RPC header. 1928 */ 1929 nfsrv_dorec(slp, nd) 1930 register struct nfssvc_sock *slp; 1931 register struct nfsd *nd; 1932 { 1933 register struct mbuf *m; 1934 int error; 1935 1936 if ((slp->ns_flag & SLP_VALID) == 0 || 1937 (m = slp->ns_rec) == (struct mbuf *)0) 1938 return (ENOBUFS); 1939 if (slp->ns_rec = m->m_nextpkt) 1940 m->m_nextpkt = (struct mbuf *)0; 1941 else 1942 slp->ns_recend = (struct mbuf *)0; 1943 if (m->m_type == MT_SONAME) { 1944 nd->nd_nam = m; 1945 nd->nd_md = nd->nd_mrep = m->m_next; 1946 m->m_next = (struct mbuf *)0; 1947 } else { 1948 nd->nd_nam = (struct mbuf *)0; 1949 nd->nd_md = nd->nd_mrep = m; 1950 } 1951 nd->nd_dpos = mtod(nd->nd_md, caddr_t); 1952 if (error = nfs_getreq(nd, TRUE)) { 1953 m_freem(nd->nd_nam); 1954 return (error); 1955 } 1956 return (0); 1957 } 1958 1959 /* 1960 * Search for a sleeping nfsd and wake it up. 1961 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 1962 * running nfsds will go look for the work in the nfssvc_sock list. 1963 */ 1964 void 1965 nfsrv_wakenfsd(slp) 1966 struct nfssvc_sock *slp; 1967 { 1968 register struct nfsd *nd; 1969 1970 if ((slp->ns_flag & SLP_VALID) == 0) 1971 return; 1972 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nd_chain.tqe_next) { 1973 if (nd->nd_flag & NFSD_WAITING) { 1974 nd->nd_flag &= ~NFSD_WAITING; 1975 if (nd->nd_slp) 1976 panic("nfsd wakeup"); 1977 slp->ns_sref++; 1978 nd->nd_slp = slp; 1979 wakeup((caddr_t)nd); 1980 return; 1981 } 1982 } 1983 slp->ns_flag |= SLP_DOREC; 1984 nfsd_head_flag |= NFSD_CHECKSLP; 1985 } 1986 #endif /* NFSSERVER */ 1987