1 /* 2 * Copyright (c) 1989, 1991, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 37 * $FreeBSD: src/sys/nfs/nfs_socket.c,v 1.60.2.6 2003/03/26 01:44:46 alfred Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_socket.c,v 1.2 2003/06/17 04:28:54 dillon Exp $ 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/malloc.h> 49 #include <sys/mount.h> 50 #include <sys/kernel.h> 51 #include <sys/mbuf.h> 52 #include <sys/vnode.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/sysctl.h> 59 #include <sys/signalvar.h> 60 61 #include <netinet/in.h> 62 #include <netinet/tcp.h> 63 64 #include <nfs/rpcv2.h> 65 #include <nfs/nfsproto.h> 66 #include <nfs/nfs.h> 67 #include <nfs/xdr_subs.h> 68 #include <nfs/nfsm_subs.h> 69 #include <nfs/nfsmount.h> 70 #include <nfs/nfsnode.h> 71 #include <nfs/nfsrtt.h> 72 #include <nfs/nqnfs.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 static int nfs_realign_test; 122 static int nfs_realign_count; 123 static int nfs_bufpackets = 4; 124 125 SYSCTL_DECL(_vfs_nfs); 126 127 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, ""); 128 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, ""); 129 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, ""); 130 131 132 /* 133 * There is a congestion window for outstanding rpcs maintained per mount 134 * point. The cwnd size is adjusted in roughly the way that: 135 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 136 * SIGCOMM '88". ACM, August 1988. 137 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 138 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 139 * of rpcs is in progress. 140 * (The sent count and cwnd are scaled for integer arith.) 141 * Variants of "slow start" were tried and were found to be too much of a 142 * performance hit (ave. rtt 3 times larger), 143 * I suspect due to the large rtt that nfs rpcs have. 144 */ 145 #define NFS_CWNDSCALE 256 146 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 147 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 148 int nfsrtton = 0; 149 struct nfsrtt nfsrtt; 150 struct callout_handle nfs_timer_handle; 151 152 static int nfs_msg __P((struct proc *,char *,char *)); 153 static int nfs_rcvlock __P((struct nfsreq *)); 154 static void nfs_rcvunlock __P((struct nfsreq *)); 155 static void nfs_realign __P((struct mbuf **pm, int hsiz)); 156 static int nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname, 157 struct mbuf **mp)); 158 static void nfs_softterm __P((struct nfsreq *rep)); 159 static int nfs_reconnect __P((struct nfsreq *rep)); 160 #ifndef NFS_NOSERVER 161 static int nfsrv_getstream __P((struct nfssvc_sock *,int)); 162 163 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *nd, 164 struct nfssvc_sock *slp, 165 struct proc *procp, 166 struct mbuf **mreqp)) = { 167 nfsrv_null, 168 nfsrv_getattr, 169 nfsrv_setattr, 170 nfsrv_lookup, 171 nfsrv3_access, 172 nfsrv_readlink, 173 nfsrv_read, 174 nfsrv_write, 175 nfsrv_create, 176 nfsrv_mkdir, 177 nfsrv_symlink, 178 nfsrv_mknod, 179 nfsrv_remove, 180 nfsrv_rmdir, 181 nfsrv_rename, 182 nfsrv_link, 183 nfsrv_readdir, 184 nfsrv_readdirplus, 185 nfsrv_statfs, 186 nfsrv_fsinfo, 187 nfsrv_pathconf, 188 nfsrv_commit, 189 nqnfsrv_getlease, 190 nqnfsrv_vacated, 191 nfsrv_noop, 192 nfsrv_noop 193 }; 194 #endif /* NFS_NOSERVER */ 195 196 /* 197 * Initialize sockets and congestion for a new NFS connection. 198 * We do not free the sockaddr if error. 199 */ 200 int 201 nfs_connect(nmp, rep) 202 register struct nfsmount *nmp; 203 struct nfsreq *rep; 204 { 205 register struct socket *so; 206 int s, error, rcvreserve, sndreserve; 207 int pktscale; 208 struct sockaddr *saddr; 209 struct sockaddr_in *sin; 210 struct proc *p = &proc0; /* only used for socreate and sobind */ 211 212 nmp->nm_so = (struct socket *)0; 213 saddr = nmp->nm_nam; 214 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 215 nmp->nm_soproto, p); 216 if (error) 217 goto bad; 218 so = nmp->nm_so; 219 nmp->nm_soflags = so->so_proto->pr_flags; 220 221 /* 222 * Some servers require that the client port be a reserved port number. 223 */ 224 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 225 struct sockopt sopt; 226 int ip; 227 struct sockaddr_in ssin; 228 229 bzero(&sopt, sizeof sopt); 230 ip = IP_PORTRANGE_LOW; 231 sopt.sopt_dir = SOPT_SET; 232 sopt.sopt_level = IPPROTO_IP; 233 sopt.sopt_name = IP_PORTRANGE; 234 sopt.sopt_val = (void *)&ip; 235 sopt.sopt_valsize = sizeof(ip); 236 sopt.sopt_p = NULL; 237 error = sosetopt(so, &sopt); 238 if (error) 239 goto bad; 240 bzero(&ssin, sizeof ssin); 241 sin = &ssin; 242 sin->sin_len = sizeof (struct sockaddr_in); 243 sin->sin_family = AF_INET; 244 sin->sin_addr.s_addr = INADDR_ANY; 245 sin->sin_port = htons(0); 246 error = sobind(so, (struct sockaddr *)sin, p); 247 if (error) 248 goto bad; 249 bzero(&sopt, sizeof sopt); 250 ip = IP_PORTRANGE_DEFAULT; 251 sopt.sopt_dir = SOPT_SET; 252 sopt.sopt_level = IPPROTO_IP; 253 sopt.sopt_name = IP_PORTRANGE; 254 sopt.sopt_val = (void *)&ip; 255 sopt.sopt_valsize = sizeof(ip); 256 sopt.sopt_p = NULL; 257 error = sosetopt(so, &sopt); 258 if (error) 259 goto bad; 260 } 261 262 /* 263 * Protocols that do not require connections may be optionally left 264 * unconnected for servers that reply from a port other than NFS_PORT. 265 */ 266 if (nmp->nm_flag & NFSMNT_NOCONN) { 267 if (nmp->nm_soflags & PR_CONNREQUIRED) { 268 error = ENOTCONN; 269 goto bad; 270 } 271 } else { 272 error = soconnect(so, nmp->nm_nam, p); 273 if (error) 274 goto bad; 275 276 /* 277 * Wait for the connection to complete. Cribbed from the 278 * connect system call but with the wait timing out so 279 * that interruptible mounts don't hang here for a long time. 280 */ 281 s = splnet(); 282 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 283 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 284 "nfscon", 2 * hz); 285 if ((so->so_state & SS_ISCONNECTING) && 286 so->so_error == 0 && rep && 287 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 288 so->so_state &= ~SS_ISCONNECTING; 289 splx(s); 290 goto bad; 291 } 292 } 293 if (so->so_error) { 294 error = so->so_error; 295 so->so_error = 0; 296 splx(s); 297 goto bad; 298 } 299 splx(s); 300 } 301 so->so_rcv.sb_timeo = (5 * hz); 302 so->so_snd.sb_timeo = (5 * hz); 303 304 /* 305 * Get buffer reservation size from sysctl, but impose reasonable 306 * limits. 307 */ 308 pktscale = nfs_bufpackets; 309 if (pktscale < 2) 310 pktscale = 2; 311 if (pktscale > 64) 312 pktscale = 64; 313 314 if (nmp->nm_sotype == SOCK_DGRAM) { 315 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; 316 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 317 NFS_MAXPKTHDR) * pktscale; 318 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 319 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; 320 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 321 NFS_MAXPKTHDR) * pktscale; 322 } else { 323 if (nmp->nm_sotype != SOCK_STREAM) 324 panic("nfscon sotype"); 325 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 326 struct sockopt sopt; 327 int val; 328 329 bzero(&sopt, sizeof sopt); 330 sopt.sopt_level = SOL_SOCKET; 331 sopt.sopt_name = SO_KEEPALIVE; 332 sopt.sopt_val = &val; 333 sopt.sopt_valsize = sizeof val; 334 val = 1; 335 sosetopt(so, &sopt); 336 } 337 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 338 struct sockopt sopt; 339 int val; 340 341 bzero(&sopt, sizeof sopt); 342 sopt.sopt_level = IPPROTO_TCP; 343 sopt.sopt_name = TCP_NODELAY; 344 sopt.sopt_val = &val; 345 sopt.sopt_valsize = sizeof val; 346 val = 1; 347 sosetopt(so, &sopt); 348 } 349 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 350 sizeof (u_int32_t)) * pktscale; 351 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 352 sizeof (u_int32_t)) * pktscale; 353 } 354 error = soreserve(so, sndreserve, rcvreserve); 355 if (error) 356 goto bad; 357 so->so_rcv.sb_flags |= SB_NOINTR; 358 so->so_snd.sb_flags |= SB_NOINTR; 359 360 /* Initialize other non-zero congestion variables */ 361 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = 362 nmp->nm_srtt[3] = (NFS_TIMEO << 3); 363 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 364 nmp->nm_sdrtt[3] = 0; 365 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 366 nmp->nm_sent = 0; 367 nmp->nm_timeouts = 0; 368 return (0); 369 370 bad: 371 nfs_disconnect(nmp); 372 return (error); 373 } 374 375 /* 376 * Reconnect routine: 377 * Called when a connection is broken on a reliable protocol. 378 * - clean up the old socket 379 * - nfs_connect() again 380 * - set R_MUSTRESEND for all outstanding requests on mount point 381 * If this fails the mount point is DEAD! 382 * nb: Must be called with the nfs_sndlock() set on the mount point. 383 */ 384 static int 385 nfs_reconnect(rep) 386 register struct nfsreq *rep; 387 { 388 register struct nfsreq *rp; 389 register struct nfsmount *nmp = rep->r_nmp; 390 int error; 391 392 nfs_disconnect(nmp); 393 while ((error = nfs_connect(nmp, rep)) != 0) { 394 if (error == EINTR || error == ERESTART) 395 return (EINTR); 396 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); 397 } 398 399 /* 400 * Loop through outstanding request list and fix up all requests 401 * on old socket. 402 */ 403 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) { 404 if (rp->r_nmp == nmp) 405 rp->r_flags |= R_MUSTRESEND; 406 } 407 return (0); 408 } 409 410 /* 411 * NFS disconnect. Clean up and unlink. 412 */ 413 void 414 nfs_disconnect(nmp) 415 register struct nfsmount *nmp; 416 { 417 register struct socket *so; 418 419 if (nmp->nm_so) { 420 so = nmp->nm_so; 421 nmp->nm_so = (struct socket *)0; 422 soshutdown(so, 2); 423 soclose(so); 424 } 425 } 426 427 void 428 nfs_safedisconnect(nmp) 429 struct nfsmount *nmp; 430 { 431 struct nfsreq dummyreq; 432 433 bzero(&dummyreq, sizeof(dummyreq)); 434 dummyreq.r_nmp = nmp; 435 nfs_rcvlock(&dummyreq); 436 nfs_disconnect(nmp); 437 nfs_rcvunlock(&dummyreq); 438 } 439 440 /* 441 * This is the nfs send routine. For connection based socket types, it 442 * must be called with an nfs_sndlock() on the socket. 443 * "rep == NULL" indicates that it has been called from a server. 444 * For the client side: 445 * - return EINTR if the RPC is terminated, 0 otherwise 446 * - set R_MUSTRESEND if the send fails for any reason 447 * - do any cleanup required by recoverable socket errors (?) 448 * For the server side: 449 * - return EINTR or ERESTART if interrupted by a signal 450 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 451 * - do any cleanup required by recoverable socket errors (?) 452 */ 453 int 454 nfs_send(so, nam, top, rep) 455 register struct socket *so; 456 struct sockaddr *nam; 457 register struct mbuf *top; 458 struct nfsreq *rep; 459 { 460 struct sockaddr *sendnam; 461 int error, soflags, flags; 462 463 if (rep) { 464 if (rep->r_flags & R_SOFTTERM) { 465 m_freem(top); 466 return (EINTR); 467 } 468 if ((so = rep->r_nmp->nm_so) == NULL) { 469 rep->r_flags |= R_MUSTRESEND; 470 m_freem(top); 471 return (0); 472 } 473 rep->r_flags &= ~R_MUSTRESEND; 474 soflags = rep->r_nmp->nm_soflags; 475 } else 476 soflags = so->so_proto->pr_flags; 477 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 478 sendnam = (struct sockaddr *)0; 479 else 480 sendnam = nam; 481 if (so->so_type == SOCK_SEQPACKET) 482 flags = MSG_EOR; 483 else 484 flags = 0; 485 486 error = so->so_proto->pr_usrreqs->pru_sosend(so, sendnam, 0, top, 0, 487 flags, curproc /*XXX*/); 488 /* 489 * ENOBUFS for dgram sockets is transient and non fatal. 490 * No need to log, and no need to break a soft mount. 491 */ 492 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 493 error = 0; 494 if (rep) /* do backoff retransmit on client */ 495 rep->r_flags |= R_MUSTRESEND; 496 } 497 498 if (error) { 499 if (rep) { 500 log(LOG_INFO, "nfs send error %d for server %s\n",error, 501 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 502 /* 503 * Deal with errors for the client side. 504 */ 505 if (rep->r_flags & R_SOFTTERM) 506 error = EINTR; 507 else 508 rep->r_flags |= R_MUSTRESEND; 509 } else 510 log(LOG_INFO, "nfsd send error %d\n", error); 511 512 /* 513 * Handle any recoverable (soft) socket errors here. (?) 514 */ 515 if (error != EINTR && error != ERESTART && 516 error != EWOULDBLOCK && error != EPIPE) 517 error = 0; 518 } 519 return (error); 520 } 521 522 /* 523 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 524 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 525 * Mark and consolidate the data into a new mbuf list. 526 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 527 * small mbufs. 528 * For SOCK_STREAM we must be very careful to read an entire record once 529 * we have read any of it, even if the system call has been interrupted. 530 */ 531 static int 532 nfs_receive(rep, aname, mp) 533 register struct nfsreq *rep; 534 struct sockaddr **aname; 535 struct mbuf **mp; 536 { 537 register struct socket *so; 538 struct uio auio; 539 struct iovec aio; 540 register struct mbuf *m; 541 struct mbuf *control; 542 u_int32_t len; 543 struct sockaddr **getnam; 544 int error, sotype, rcvflg; 545 struct proc *p = curproc; /* XXX */ 546 547 /* 548 * Set up arguments for soreceive() 549 */ 550 *mp = (struct mbuf *)0; 551 *aname = (struct sockaddr *)0; 552 sotype = rep->r_nmp->nm_sotype; 553 554 /* 555 * For reliable protocols, lock against other senders/receivers 556 * in case a reconnect is necessary. 557 * For SOCK_STREAM, first get the Record Mark to find out how much 558 * more there is to get. 559 * We must lock the socket against other receivers 560 * until we have an entire rpc request/reply. 561 */ 562 if (sotype != SOCK_DGRAM) { 563 error = nfs_sndlock(rep); 564 if (error) 565 return (error); 566 tryagain: 567 /* 568 * Check for fatal errors and resending request. 569 */ 570 /* 571 * Ugh: If a reconnect attempt just happened, nm_so 572 * would have changed. NULL indicates a failed 573 * attempt that has essentially shut down this 574 * mount point. 575 */ 576 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 577 nfs_sndunlock(rep); 578 return (EINTR); 579 } 580 so = rep->r_nmp->nm_so; 581 if (!so) { 582 error = nfs_reconnect(rep); 583 if (error) { 584 nfs_sndunlock(rep); 585 return (error); 586 } 587 goto tryagain; 588 } 589 while (rep->r_flags & R_MUSTRESEND) { 590 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 591 nfsstats.rpcretries++; 592 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 593 if (error) { 594 if (error == EINTR || error == ERESTART || 595 (error = nfs_reconnect(rep)) != 0) { 596 nfs_sndunlock(rep); 597 return (error); 598 } 599 goto tryagain; 600 } 601 } 602 nfs_sndunlock(rep); 603 if (sotype == SOCK_STREAM) { 604 aio.iov_base = (caddr_t) &len; 605 aio.iov_len = sizeof(u_int32_t); 606 auio.uio_iov = &aio; 607 auio.uio_iovcnt = 1; 608 auio.uio_segflg = UIO_SYSSPACE; 609 auio.uio_rw = UIO_READ; 610 auio.uio_offset = 0; 611 auio.uio_resid = sizeof(u_int32_t); 612 auio.uio_procp = p; 613 do { 614 rcvflg = MSG_WAITALL; 615 error = so->so_proto->pr_usrreqs->pru_soreceive 616 (so, (struct sockaddr **)0, &auio, 617 (struct mbuf **)0, (struct mbuf **)0, 618 &rcvflg); 619 if (error == EWOULDBLOCK && rep) { 620 if (rep->r_flags & R_SOFTTERM) 621 return (EINTR); 622 } 623 } while (error == EWOULDBLOCK); 624 if (!error && auio.uio_resid > 0) { 625 /* 626 * Don't log a 0 byte receive; it means 627 * that the socket has been closed, and 628 * can happen during normal operation 629 * (forcible unmount or Solaris server). 630 */ 631 if (auio.uio_resid != sizeof (u_int32_t)) 632 log(LOG_INFO, 633 "short receive (%d/%d) from nfs server %s\n", 634 (int)(sizeof(u_int32_t) - auio.uio_resid), 635 (int)sizeof(u_int32_t), 636 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 637 error = EPIPE; 638 } 639 if (error) 640 goto errout; 641 len = ntohl(len) & ~0x80000000; 642 /* 643 * This is SERIOUS! We are out of sync with the sender 644 * and forcing a disconnect/reconnect is all I can do. 645 */ 646 if (len > NFS_MAXPACKET) { 647 log(LOG_ERR, "%s (%d) from nfs server %s\n", 648 "impossible packet length", 649 len, 650 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 651 error = EFBIG; 652 goto errout; 653 } 654 auio.uio_resid = len; 655 do { 656 rcvflg = MSG_WAITALL; 657 error = so->so_proto->pr_usrreqs->pru_soreceive 658 (so, (struct sockaddr **)0, 659 &auio, mp, (struct mbuf **)0, &rcvflg); 660 } while (error == EWOULDBLOCK || error == EINTR || 661 error == ERESTART); 662 if (!error && auio.uio_resid > 0) { 663 if (len != auio.uio_resid) 664 log(LOG_INFO, 665 "short receive (%d/%d) from nfs server %s\n", 666 len - auio.uio_resid, len, 667 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 668 error = EPIPE; 669 } 670 } else { 671 /* 672 * NB: Since uio_resid is big, MSG_WAITALL is ignored 673 * and soreceive() will return when it has either a 674 * control msg or a data msg. 675 * We have no use for control msg., but must grab them 676 * and then throw them away so we know what is going 677 * on. 678 */ 679 auio.uio_resid = len = 100000000; /* Anything Big */ 680 auio.uio_procp = p; 681 do { 682 rcvflg = 0; 683 error = so->so_proto->pr_usrreqs->pru_soreceive 684 (so, (struct sockaddr **)0, 685 &auio, mp, &control, &rcvflg); 686 if (control) 687 m_freem(control); 688 if (error == EWOULDBLOCK && rep) { 689 if (rep->r_flags & R_SOFTTERM) 690 return (EINTR); 691 } 692 } while (error == EWOULDBLOCK || 693 (!error && *mp == NULL && control)); 694 if ((rcvflg & MSG_EOR) == 0) 695 printf("Egad!!\n"); 696 if (!error && *mp == NULL) 697 error = EPIPE; 698 len -= auio.uio_resid; 699 } 700 errout: 701 if (error && error != EINTR && error != ERESTART) { 702 m_freem(*mp); 703 *mp = (struct mbuf *)0; 704 if (error != EPIPE) 705 log(LOG_INFO, 706 "receive error %d from nfs server %s\n", 707 error, 708 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 709 error = nfs_sndlock(rep); 710 if (!error) { 711 error = nfs_reconnect(rep); 712 if (!error) 713 goto tryagain; 714 else 715 nfs_sndunlock(rep); 716 } 717 } 718 } else { 719 if ((so = rep->r_nmp->nm_so) == NULL) 720 return (EACCES); 721 if (so->so_state & SS_ISCONNECTED) 722 getnam = (struct sockaddr **)0; 723 else 724 getnam = aname; 725 auio.uio_resid = len = 1000000; 726 auio.uio_procp = p; 727 do { 728 rcvflg = 0; 729 error = so->so_proto->pr_usrreqs->pru_soreceive 730 (so, getnam, &auio, mp, 731 (struct mbuf **)0, &rcvflg); 732 if (error == EWOULDBLOCK && 733 (rep->r_flags & R_SOFTTERM)) 734 return (EINTR); 735 } while (error == EWOULDBLOCK); 736 len -= auio.uio_resid; 737 } 738 if (error) { 739 m_freem(*mp); 740 *mp = (struct mbuf *)0; 741 } 742 /* 743 * Search for any mbufs that are not a multiple of 4 bytes long 744 * or with m_data not longword aligned. 745 * These could cause pointer alignment problems, so copy them to 746 * well aligned mbufs. 747 */ 748 nfs_realign(mp, 5 * NFSX_UNSIGNED); 749 return (error); 750 } 751 752 /* 753 * Implement receipt of reply on a socket. 754 * We must search through the list of received datagrams matching them 755 * with outstanding requests using the xid, until ours is found. 756 */ 757 /* ARGSUSED */ 758 int 759 nfs_reply(myrep) 760 struct nfsreq *myrep; 761 { 762 register struct nfsreq *rep; 763 register struct nfsmount *nmp = myrep->r_nmp; 764 register int32_t t1; 765 struct mbuf *mrep, *md; 766 struct sockaddr *nam; 767 u_int32_t rxid, *tl; 768 caddr_t dpos, cp2; 769 int error; 770 771 /* 772 * Loop around until we get our own reply 773 */ 774 for (;;) { 775 /* 776 * Lock against other receivers so that I don't get stuck in 777 * sbwait() after someone else has received my reply for me. 778 * Also necessary for connection based protocols to avoid 779 * race conditions during a reconnect. 780 * If nfs_rcvlock() returns EALREADY, that means that 781 * the reply has already been recieved by another 782 * process and we can return immediately. In this 783 * case, the lock is not taken to avoid races with 784 * other processes. 785 */ 786 error = nfs_rcvlock(myrep); 787 if (error == EALREADY) 788 return (0); 789 if (error) 790 return (error); 791 /* 792 * Get the next Rpc reply off the socket 793 */ 794 error = nfs_receive(myrep, &nam, &mrep); 795 nfs_rcvunlock(myrep); 796 if (error) { 797 798 /* 799 * Ignore routing errors on connectionless protocols?? 800 */ 801 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 802 nmp->nm_so->so_error = 0; 803 if (myrep->r_flags & R_GETONEREP) 804 return (0); 805 continue; 806 } 807 return (error); 808 } 809 if (nam) 810 FREE(nam, M_SONAME); 811 812 /* 813 * Get the xid and check that it is an rpc reply 814 */ 815 md = mrep; 816 dpos = mtod(md, caddr_t); 817 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 818 rxid = *tl++; 819 if (*tl != rpc_reply) { 820 #ifndef NFS_NOSERVER 821 if (nmp->nm_flag & NFSMNT_NQNFS) { 822 if (nqnfs_callback(nmp, mrep, md, dpos)) 823 nfsstats.rpcinvalid++; 824 } else { 825 nfsstats.rpcinvalid++; 826 m_freem(mrep); 827 } 828 #else 829 nfsstats.rpcinvalid++; 830 m_freem(mrep); 831 #endif 832 nfsmout: 833 if (myrep->r_flags & R_GETONEREP) 834 return (0); 835 continue; 836 } 837 838 /* 839 * Loop through the request list to match up the reply 840 * Iff no match, just drop the datagram 841 */ 842 for (rep = nfs_reqq.tqh_first; rep != 0; 843 rep = rep->r_chain.tqe_next) { 844 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 845 /* Found it.. */ 846 rep->r_mrep = mrep; 847 rep->r_md = md; 848 rep->r_dpos = dpos; 849 if (nfsrtton) { 850 struct rttl *rt; 851 852 rt = &nfsrtt.rttl[nfsrtt.pos]; 853 rt->proc = rep->r_procnum; 854 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 855 rt->sent = nmp->nm_sent; 856 rt->cwnd = nmp->nm_cwnd; 857 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 858 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 859 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 860 getmicrotime(&rt->tstamp); 861 if (rep->r_flags & R_TIMING) 862 rt->rtt = rep->r_rtt; 863 else 864 rt->rtt = 1000000; 865 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 866 } 867 /* 868 * Update congestion window. 869 * Do the additive increase of 870 * one rpc/rtt. 871 */ 872 if (nmp->nm_cwnd <= nmp->nm_sent) { 873 nmp->nm_cwnd += 874 (NFS_CWNDSCALE * NFS_CWNDSCALE + 875 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 876 if (nmp->nm_cwnd > NFS_MAXCWND) 877 nmp->nm_cwnd = NFS_MAXCWND; 878 } 879 if (rep->r_flags & R_SENT) { 880 rep->r_flags &= ~R_SENT; 881 nmp->nm_sent -= NFS_CWNDSCALE; 882 } 883 /* 884 * Update rtt using a gain of 0.125 on the mean 885 * and a gain of 0.25 on the deviation. 886 */ 887 if (rep->r_flags & R_TIMING) { 888 /* 889 * Since the timer resolution of 890 * NFS_HZ is so course, it can often 891 * result in r_rtt == 0. Since 892 * r_rtt == N means that the actual 893 * rtt is between N+dt and N+2-dt ticks, 894 * add 1. 895 */ 896 t1 = rep->r_rtt + 1; 897 t1 -= (NFS_SRTT(rep) >> 3); 898 NFS_SRTT(rep) += t1; 899 if (t1 < 0) 900 t1 = -t1; 901 t1 -= (NFS_SDRTT(rep) >> 2); 902 NFS_SDRTT(rep) += t1; 903 } 904 nmp->nm_timeouts = 0; 905 break; 906 } 907 } 908 /* 909 * If not matched to a request, drop it. 910 * If it's mine, get out. 911 */ 912 if (rep == 0) { 913 nfsstats.rpcunexpected++; 914 m_freem(mrep); 915 } else if (rep == myrep) { 916 if (rep->r_mrep == NULL) 917 panic("nfsreply nil"); 918 return (0); 919 } 920 if (myrep->r_flags & R_GETONEREP) 921 return (0); 922 } 923 } 924 925 /* 926 * nfs_request - goes something like this 927 * - fill in request struct 928 * - links it into list 929 * - calls nfs_send() for first transmit 930 * - calls nfs_receive() to get reply 931 * - break down rpc header and return with nfs reply pointed to 932 * by mrep or error 933 * nb: always frees up mreq mbuf list 934 */ 935 int 936 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp) 937 struct vnode *vp; 938 struct mbuf *mrest; 939 int procnum; 940 struct proc *procp; 941 struct ucred *cred; 942 struct mbuf **mrp; 943 struct mbuf **mdp; 944 caddr_t *dposp; 945 { 946 register struct mbuf *mrep, *m2; 947 register struct nfsreq *rep; 948 register u_int32_t *tl; 949 register int i; 950 struct nfsmount *nmp; 951 struct mbuf *m, *md, *mheadend; 952 struct nfsnode *np; 953 char nickv[RPCX_NICKVERF]; 954 time_t reqtime, waituntil; 955 caddr_t dpos, cp2; 956 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type; 957 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 958 int verf_len, verf_type; 959 u_int32_t xid; 960 u_quad_t frev; 961 char *auth_str, *verf_str; 962 NFSKERBKEY_T key; /* save session key */ 963 964 /* Reject requests while attempting a forced unmount. */ 965 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { 966 m_freem(mrest); 967 return (ESTALE); 968 } 969 nmp = VFSTONFS(vp->v_mount); 970 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 971 rep->r_nmp = nmp; 972 rep->r_vp = vp; 973 rep->r_procp = procp; 974 rep->r_procnum = procnum; 975 i = 0; 976 m = mrest; 977 while (m) { 978 i += m->m_len; 979 m = m->m_next; 980 } 981 mrest_len = i; 982 983 /* 984 * Get the RPC header with authorization. 985 */ 986 kerbauth: 987 verf_str = auth_str = (char *)0; 988 if (nmp->nm_flag & NFSMNT_KERB) { 989 verf_str = nickv; 990 verf_len = sizeof (nickv); 991 auth_type = RPCAUTH_KERB4; 992 bzero((caddr_t)key, sizeof (key)); 993 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 994 &auth_len, verf_str, verf_len)) { 995 error = nfs_getauth(nmp, rep, cred, &auth_str, 996 &auth_len, verf_str, &verf_len, key); 997 if (error) { 998 free((caddr_t)rep, M_NFSREQ); 999 m_freem(mrest); 1000 return (error); 1001 } 1002 } 1003 } else { 1004 auth_type = RPCAUTH_UNIX; 1005 if (cred->cr_ngroups < 1) 1006 panic("nfsreq nogrps"); 1007 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 1008 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 1009 5 * NFSX_UNSIGNED; 1010 } 1011 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1012 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1013 if (auth_str) 1014 free(auth_str, M_TEMP); 1015 1016 /* 1017 * For stream protocols, insert a Sun RPC Record Mark. 1018 */ 1019 if (nmp->nm_sotype == SOCK_STREAM) { 1020 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1021 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1022 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1023 } 1024 rep->r_mreq = m; 1025 rep->r_xid = xid; 1026 tryagain: 1027 if (nmp->nm_flag & NFSMNT_SOFT) 1028 rep->r_retry = nmp->nm_retry; 1029 else 1030 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1031 rep->r_rtt = rep->r_rexmit = 0; 1032 if (proct[procnum] > 0) 1033 rep->r_flags = R_TIMING; 1034 else 1035 rep->r_flags = 0; 1036 rep->r_mrep = NULL; 1037 1038 /* 1039 * Do the client side RPC. 1040 */ 1041 nfsstats.rpcrequests++; 1042 /* 1043 * Chain request into list of outstanding requests. Be sure 1044 * to put it LAST so timer finds oldest requests first. 1045 */ 1046 s = splsoftclock(); 1047 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1048 1049 /* Get send time for nqnfs */ 1050 reqtime = time_second; 1051 1052 /* 1053 * If backing off another request or avoiding congestion, don't 1054 * send this one now but let timer do it. If not timing a request, 1055 * do it now. 1056 */ 1057 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1058 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1059 nmp->nm_sent < nmp->nm_cwnd)) { 1060 splx(s); 1061 if (nmp->nm_soflags & PR_CONNREQUIRED) 1062 error = nfs_sndlock(rep); 1063 if (!error) { 1064 m2 = m_copym(m, 0, M_COPYALL, M_WAIT); 1065 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); 1066 if (nmp->nm_soflags & PR_CONNREQUIRED) 1067 nfs_sndunlock(rep); 1068 } 1069 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1070 nmp->nm_sent += NFS_CWNDSCALE; 1071 rep->r_flags |= R_SENT; 1072 } 1073 } else { 1074 splx(s); 1075 rep->r_rtt = -1; 1076 } 1077 1078 /* 1079 * Wait for the reply from our send or the timer's. 1080 */ 1081 if (!error || error == EPIPE) 1082 error = nfs_reply(rep); 1083 1084 /* 1085 * RPC done, unlink the request. 1086 */ 1087 s = splsoftclock(); 1088 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1089 splx(s); 1090 1091 /* 1092 * Decrement the outstanding request count. 1093 */ 1094 if (rep->r_flags & R_SENT) { 1095 rep->r_flags &= ~R_SENT; /* paranoia */ 1096 nmp->nm_sent -= NFS_CWNDSCALE; 1097 } 1098 1099 /* 1100 * If there was a successful reply and a tprintf msg. 1101 * tprintf a response. 1102 */ 1103 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1104 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1105 "is alive again"); 1106 mrep = rep->r_mrep; 1107 md = rep->r_md; 1108 dpos = rep->r_dpos; 1109 if (error) { 1110 m_freem(rep->r_mreq); 1111 free((caddr_t)rep, M_NFSREQ); 1112 return (error); 1113 } 1114 1115 /* 1116 * break down the rpc header and check if ok 1117 */ 1118 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1119 if (*tl++ == rpc_msgdenied) { 1120 if (*tl == rpc_mismatch) 1121 error = EOPNOTSUPP; 1122 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1123 if (!failed_auth) { 1124 failed_auth++; 1125 mheadend->m_next = (struct mbuf *)0; 1126 m_freem(mrep); 1127 m_freem(rep->r_mreq); 1128 goto kerbauth; 1129 } else 1130 error = EAUTH; 1131 } else 1132 error = EACCES; 1133 m_freem(mrep); 1134 m_freem(rep->r_mreq); 1135 free((caddr_t)rep, M_NFSREQ); 1136 return (error); 1137 } 1138 1139 /* 1140 * Grab any Kerberos verifier, otherwise just throw it away. 1141 */ 1142 verf_type = fxdr_unsigned(int, *tl++); 1143 i = fxdr_unsigned(int32_t, *tl); 1144 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1145 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1146 if (error) 1147 goto nfsmout; 1148 } else if (i > 0) 1149 nfsm_adv(nfsm_rndup(i)); 1150 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1151 /* 0 == ok */ 1152 if (*tl == 0) { 1153 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1154 if (*tl != 0) { 1155 error = fxdr_unsigned(int, *tl); 1156 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1157 error == NFSERR_TRYLATER) { 1158 m_freem(mrep); 1159 error = 0; 1160 waituntil = time_second + trylater_delay; 1161 while (time_second < waituntil) 1162 (void) tsleep((caddr_t)&lbolt, 1163 PSOCK, "nqnfstry", 0); 1164 trylater_delay *= nfs_backoff[trylater_cnt]; 1165 if (trylater_cnt < 7) 1166 trylater_cnt++; 1167 goto tryagain; 1168 } 1169 1170 /* 1171 * If the File Handle was stale, invalidate the 1172 * lookup cache, just in case. 1173 */ 1174 if (error == ESTALE) 1175 cache_purge(vp); 1176 if (nmp->nm_flag & NFSMNT_NFSV3) { 1177 *mrp = mrep; 1178 *mdp = md; 1179 *dposp = dpos; 1180 error |= NFSERR_RETERR; 1181 } else 1182 m_freem(mrep); 1183 m_freem(rep->r_mreq); 1184 free((caddr_t)rep, M_NFSREQ); 1185 return (error); 1186 } 1187 1188 /* 1189 * For nqnfs, get any lease in reply 1190 */ 1191 if (nmp->nm_flag & NFSMNT_NQNFS) { 1192 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1193 if (*tl) { 1194 np = VTONFS(vp); 1195 nqlflag = fxdr_unsigned(int, *tl); 1196 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1197 cachable = fxdr_unsigned(int, *tl++); 1198 reqtime += fxdr_unsigned(int, *tl++); 1199 if (reqtime > time_second) { 1200 frev = fxdr_hyper(tl); 1201 nqnfs_clientlease(nmp, np, nqlflag, 1202 cachable, reqtime, frev); 1203 } 1204 } 1205 } 1206 *mrp = mrep; 1207 *mdp = md; 1208 *dposp = dpos; 1209 m_freem(rep->r_mreq); 1210 FREE((caddr_t)rep, M_NFSREQ); 1211 return (0); 1212 } 1213 m_freem(mrep); 1214 error = EPROTONOSUPPORT; 1215 nfsmout: 1216 m_freem(rep->r_mreq); 1217 free((caddr_t)rep, M_NFSREQ); 1218 return (error); 1219 } 1220 1221 #ifndef NFS_NOSERVER 1222 /* 1223 * Generate the rpc reply header 1224 * siz arg. is used to decide if adding a cluster is worthwhile 1225 */ 1226 int 1227 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1228 int siz; 1229 struct nfsrv_descript *nd; 1230 struct nfssvc_sock *slp; 1231 int err; 1232 int cache; 1233 u_quad_t *frev; 1234 struct mbuf **mrq; 1235 struct mbuf **mbp; 1236 caddr_t *bposp; 1237 { 1238 register u_int32_t *tl; 1239 register struct mbuf *mreq; 1240 caddr_t bpos; 1241 struct mbuf *mb, *mb2; 1242 1243 MGETHDR(mreq, M_WAIT, MT_DATA); 1244 mb = mreq; 1245 /* 1246 * If this is a big reply, use a cluster else 1247 * try and leave leading space for the lower level headers. 1248 */ 1249 siz += RPC_REPLYSIZ; 1250 if ((max_hdr + siz) >= MINCLSIZE) { 1251 MCLGET(mreq, M_WAIT); 1252 } else 1253 mreq->m_data += max_hdr; 1254 tl = mtod(mreq, u_int32_t *); 1255 mreq->m_len = 6 * NFSX_UNSIGNED; 1256 bpos = ((caddr_t)tl) + mreq->m_len; 1257 *tl++ = txdr_unsigned(nd->nd_retxid); 1258 *tl++ = rpc_reply; 1259 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1260 *tl++ = rpc_msgdenied; 1261 if (err & NFSERR_AUTHERR) { 1262 *tl++ = rpc_autherr; 1263 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1264 mreq->m_len -= NFSX_UNSIGNED; 1265 bpos -= NFSX_UNSIGNED; 1266 } else { 1267 *tl++ = rpc_mismatch; 1268 *tl++ = txdr_unsigned(RPC_VER2); 1269 *tl = txdr_unsigned(RPC_VER2); 1270 } 1271 } else { 1272 *tl++ = rpc_msgaccepted; 1273 1274 /* 1275 * For Kerberos authentication, we must send the nickname 1276 * verifier back, otherwise just RPCAUTH_NULL. 1277 */ 1278 if (nd->nd_flag & ND_KERBFULL) { 1279 register struct nfsuid *nuidp; 1280 struct timeval ktvin, ktvout; 1281 1282 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1283 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1284 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1285 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1286 &nuidp->nu_haddr, nd->nd_nam2))) 1287 break; 1288 } 1289 if (nuidp) { 1290 ktvin.tv_sec = 1291 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1292 ktvin.tv_usec = 1293 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1294 1295 /* 1296 * Encrypt the timestamp in ecb mode using the 1297 * session key. 1298 */ 1299 #ifdef NFSKERB 1300 XXX 1301 #endif 1302 1303 *tl++ = rpc_auth_kerb; 1304 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1305 *tl = ktvout.tv_sec; 1306 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1307 *tl++ = ktvout.tv_usec; 1308 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1309 } else { 1310 *tl++ = 0; 1311 *tl++ = 0; 1312 } 1313 } else { 1314 *tl++ = 0; 1315 *tl++ = 0; 1316 } 1317 switch (err) { 1318 case EPROGUNAVAIL: 1319 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1320 break; 1321 case EPROGMISMATCH: 1322 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1323 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1324 if (nd->nd_flag & ND_NQNFS) { 1325 *tl++ = txdr_unsigned(3); 1326 *tl = txdr_unsigned(3); 1327 } else { 1328 *tl++ = txdr_unsigned(2); 1329 *tl = txdr_unsigned(3); 1330 } 1331 break; 1332 case EPROCUNAVAIL: 1333 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1334 break; 1335 case EBADRPC: 1336 *tl = txdr_unsigned(RPC_GARBAGE); 1337 break; 1338 default: 1339 *tl = 0; 1340 if (err != NFSERR_RETVOID) { 1341 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1342 if (err) 1343 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1344 else 1345 *tl = 0; 1346 } 1347 break; 1348 }; 1349 } 1350 1351 /* 1352 * For nqnfs, piggyback lease as requested. 1353 */ 1354 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1355 if (nd->nd_flag & ND_LEASE) { 1356 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1357 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1358 *tl++ = txdr_unsigned(cache); 1359 *tl++ = txdr_unsigned(nd->nd_duration); 1360 txdr_hyper(*frev, tl); 1361 } else { 1362 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1363 *tl = 0; 1364 } 1365 } 1366 if (mrq != NULL) 1367 *mrq = mreq; 1368 *mbp = mb; 1369 *bposp = bpos; 1370 if (err != 0 && err != NFSERR_RETVOID) 1371 nfsstats.srvrpc_errs++; 1372 return (0); 1373 } 1374 1375 1376 #endif /* NFS_NOSERVER */ 1377 /* 1378 * Nfs timer routine 1379 * Scan the nfsreq list and retranmit any requests that have timed out 1380 * To avoid retransmission attempts on STREAM sockets (in the future) make 1381 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1382 */ 1383 void 1384 nfs_timer(arg) 1385 void *arg; /* never used */ 1386 { 1387 register struct nfsreq *rep; 1388 register struct mbuf *m; 1389 register struct socket *so; 1390 register struct nfsmount *nmp; 1391 register int timeo; 1392 int s, error; 1393 #ifndef NFS_NOSERVER 1394 static long lasttime = 0; 1395 register struct nfssvc_sock *slp; 1396 u_quad_t cur_usec; 1397 #endif /* NFS_NOSERVER */ 1398 struct proc *p = &proc0; /* XXX for credentials, will break if sleep */ 1399 1400 s = splnet(); 1401 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) { 1402 nmp = rep->r_nmp; 1403 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1404 continue; 1405 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1406 nfs_softterm(rep); 1407 continue; 1408 } 1409 if (rep->r_rtt >= 0) { 1410 rep->r_rtt++; 1411 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1412 timeo = nmp->nm_timeo; 1413 else 1414 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1415 if (nmp->nm_timeouts > 0) 1416 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1417 if (rep->r_rtt <= timeo) 1418 continue; 1419 if (nmp->nm_timeouts < 8) 1420 nmp->nm_timeouts++; 1421 } 1422 /* 1423 * Check for server not responding 1424 */ 1425 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1426 rep->r_rexmit > nmp->nm_deadthresh) { 1427 nfs_msg(rep->r_procp, 1428 nmp->nm_mountp->mnt_stat.f_mntfromname, 1429 "not responding"); 1430 rep->r_flags |= R_TPRINTFMSG; 1431 } 1432 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1433 nfsstats.rpctimeouts++; 1434 nfs_softterm(rep); 1435 continue; 1436 } 1437 if (nmp->nm_sotype != SOCK_DGRAM) { 1438 if (++rep->r_rexmit > NFS_MAXREXMIT) 1439 rep->r_rexmit = NFS_MAXREXMIT; 1440 continue; 1441 } 1442 if ((so = nmp->nm_so) == NULL) 1443 continue; 1444 1445 /* 1446 * If there is enough space and the window allows.. 1447 * Resend it 1448 * Set r_rtt to -1 in case we fail to send it now. 1449 */ 1450 rep->r_rtt = -1; 1451 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1452 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1453 (rep->r_flags & R_SENT) || 1454 nmp->nm_sent < nmp->nm_cwnd) && 1455 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1456 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1457 error = (*so->so_proto->pr_usrreqs->pru_send) 1458 (so, 0, m, (struct sockaddr *)0, 1459 (struct mbuf *)0, p); 1460 else 1461 error = (*so->so_proto->pr_usrreqs->pru_send) 1462 (so, 0, m, nmp->nm_nam, (struct mbuf *)0, 1463 p); 1464 if (error) { 1465 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1466 so->so_error = 0; 1467 } else { 1468 /* 1469 * Iff first send, start timing 1470 * else turn timing off, backoff timer 1471 * and divide congestion window by 2. 1472 */ 1473 if (rep->r_flags & R_SENT) { 1474 rep->r_flags &= ~R_TIMING; 1475 if (++rep->r_rexmit > NFS_MAXREXMIT) 1476 rep->r_rexmit = NFS_MAXREXMIT; 1477 nmp->nm_cwnd >>= 1; 1478 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1479 nmp->nm_cwnd = NFS_CWNDSCALE; 1480 nfsstats.rpcretries++; 1481 } else { 1482 rep->r_flags |= R_SENT; 1483 nmp->nm_sent += NFS_CWNDSCALE; 1484 } 1485 rep->r_rtt = 0; 1486 } 1487 } 1488 } 1489 #ifndef NFS_NOSERVER 1490 /* 1491 * Call the nqnfs server timer once a second to handle leases. 1492 */ 1493 if (lasttime != time_second) { 1494 lasttime = time_second; 1495 nqnfs_serverd(); 1496 } 1497 1498 /* 1499 * Scan the write gathering queues for writes that need to be 1500 * completed now. 1501 */ 1502 cur_usec = nfs_curusec(); 1503 for (slp = nfssvc_sockhead.tqh_first; slp != 0; 1504 slp = slp->ns_chain.tqe_next) { 1505 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) 1506 nfsrv_wakenfsd(slp); 1507 } 1508 #endif /* NFS_NOSERVER */ 1509 splx(s); 1510 nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks); 1511 } 1512 1513 /* 1514 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1515 * wait for all requests to complete. This is used by forced unmounts 1516 * to terminate any outstanding RPCs. 1517 */ 1518 int 1519 nfs_nmcancelreqs(nmp) 1520 struct nfsmount *nmp; 1521 { 1522 struct nfsreq *req; 1523 int i, s; 1524 1525 s = splnet(); 1526 TAILQ_FOREACH(req, &nfs_reqq, r_chain) { 1527 if (nmp != req->r_nmp || req->r_mrep != NULL || 1528 (req->r_flags & R_SOFTTERM)) 1529 continue; 1530 nfs_softterm(req); 1531 } 1532 splx(s); 1533 1534 for (i = 0; i < 30; i++) { 1535 s = splnet(); 1536 TAILQ_FOREACH(req, &nfs_reqq, r_chain) { 1537 if (nmp == req->r_nmp) 1538 break; 1539 } 1540 splx(s); 1541 if (req == NULL) 1542 return (0); 1543 tsleep(&lbolt, PSOCK, "nfscancel", 0); 1544 } 1545 return (EBUSY); 1546 } 1547 1548 /* 1549 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT). 1550 * The nm_send count is decremented now to avoid deadlocks when the process in 1551 * soreceive() hasn't yet managed to send its own request. 1552 */ 1553 1554 static void 1555 nfs_softterm(rep) 1556 struct nfsreq *rep; 1557 { 1558 rep->r_flags |= R_SOFTTERM; 1559 1560 if (rep->r_flags & R_SENT) { 1561 rep->r_nmp->nm_sent -= NFS_CWNDSCALE; 1562 rep->r_flags &= ~R_SENT; 1563 } 1564 } 1565 1566 /* 1567 * Test for a termination condition pending on the process. 1568 * This is used for NFSMNT_INT mounts. 1569 */ 1570 int 1571 nfs_sigintr(nmp, rep, p) 1572 struct nfsmount *nmp; 1573 struct nfsreq *rep; 1574 register struct proc *p; 1575 { 1576 sigset_t tmpset; 1577 1578 if (rep && (rep->r_flags & R_SOFTTERM)) 1579 return (EINTR); 1580 /* Terminate all requests while attempting a forced unmount. */ 1581 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) 1582 return (EINTR); 1583 if (!(nmp->nm_flag & NFSMNT_INT)) 1584 return (0); 1585 if (p == NULL) 1586 return (0); 1587 1588 tmpset = p->p_siglist; 1589 SIGSETNAND(tmpset, p->p_sigmask); 1590 SIGSETNAND(tmpset, p->p_sigignore); 1591 if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset)) 1592 return (EINTR); 1593 1594 return (0); 1595 } 1596 1597 /* 1598 * Lock a socket against others. 1599 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1600 * and also to avoid race conditions between the processes with nfs requests 1601 * in progress when a reconnect is necessary. 1602 */ 1603 int 1604 nfs_sndlock(rep) 1605 struct nfsreq *rep; 1606 { 1607 register int *statep = &rep->r_nmp->nm_state; 1608 struct proc *p; 1609 int slpflag = 0, slptimeo = 0; 1610 1611 p = rep->r_procp; 1612 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1613 slpflag = PCATCH; 1614 while (*statep & NFSSTA_SNDLOCK) { 1615 if (nfs_sigintr(rep->r_nmp, rep, p)) 1616 return (EINTR); 1617 *statep |= NFSSTA_WANTSND; 1618 (void) tsleep((caddr_t)statep, slpflag | (PZERO - 1), 1619 "nfsndlck", slptimeo); 1620 if (slpflag == PCATCH) { 1621 slpflag = 0; 1622 slptimeo = 2 * hz; 1623 } 1624 } 1625 /* Always fail if our request has been cancelled. */ 1626 if ((rep->r_flags & R_SOFTTERM)) 1627 return (EINTR); 1628 *statep |= NFSSTA_SNDLOCK; 1629 return (0); 1630 } 1631 1632 /* 1633 * Unlock the stream socket for others. 1634 */ 1635 void 1636 nfs_sndunlock(rep) 1637 struct nfsreq *rep; 1638 { 1639 register int *statep = &rep->r_nmp->nm_state; 1640 1641 if ((*statep & NFSSTA_SNDLOCK) == 0) 1642 panic("nfs sndunlock"); 1643 *statep &= ~NFSSTA_SNDLOCK; 1644 if (*statep & NFSSTA_WANTSND) { 1645 *statep &= ~NFSSTA_WANTSND; 1646 wakeup((caddr_t)statep); 1647 } 1648 } 1649 1650 static int 1651 nfs_rcvlock(rep) 1652 register struct nfsreq *rep; 1653 { 1654 register int *statep = &rep->r_nmp->nm_state; 1655 int slpflag, slptimeo = 0; 1656 1657 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1658 slpflag = PCATCH; 1659 else 1660 slpflag = 0; 1661 while (*statep & NFSSTA_RCVLOCK) { 1662 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1663 return (EINTR); 1664 *statep |= NFSSTA_WANTRCV; 1665 (void) tsleep((caddr_t)statep, slpflag | (PZERO - 1), "nfsrcvlk", 1666 slptimeo); 1667 /* 1668 * If our reply was recieved while we were sleeping, 1669 * then just return without taking the lock to avoid a 1670 * situation where a single iod could 'capture' the 1671 * recieve lock. 1672 */ 1673 if (rep->r_mrep != NULL) 1674 return (EALREADY); 1675 if (slpflag == PCATCH) { 1676 slpflag = 0; 1677 slptimeo = 2 * hz; 1678 } 1679 } 1680 *statep |= NFSSTA_RCVLOCK; 1681 return (0); 1682 } 1683 1684 /* 1685 * Unlock the stream socket for others. 1686 */ 1687 static void 1688 nfs_rcvunlock(rep) 1689 register struct nfsreq *rep; 1690 { 1691 register int *statep = &rep->r_nmp->nm_state; 1692 1693 if ((*statep & NFSSTA_RCVLOCK) == 0) 1694 panic("nfs rcvunlock"); 1695 *statep &= ~NFSSTA_RCVLOCK; 1696 if (*statep & NFSSTA_WANTRCV) { 1697 *statep &= ~NFSSTA_WANTRCV; 1698 wakeup((caddr_t)statep); 1699 } 1700 } 1701 1702 /* 1703 * nfs_realign: 1704 * 1705 * Check for badly aligned mbuf data and realign by copying the unaligned 1706 * portion of the data into a new mbuf chain and freeing the portions 1707 * of the old chain that were replaced. 1708 * 1709 * We cannot simply realign the data within the existing mbuf chain 1710 * because the underlying buffers may contain other rpc commands and 1711 * we cannot afford to overwrite them. 1712 * 1713 * We would prefer to avoid this situation entirely. The situation does 1714 * not occur with NFS/UDP and is supposed to only occassionally occur 1715 * with TCP. Use vfs.nfs.realign_count and realign_test to check this. 1716 */ 1717 static void 1718 nfs_realign(pm, hsiz) 1719 register struct mbuf **pm; 1720 int hsiz; 1721 { 1722 struct mbuf *m; 1723 struct mbuf *n = NULL; 1724 int off = 0; 1725 1726 ++nfs_realign_test; 1727 1728 while ((m = *pm) != NULL) { 1729 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) { 1730 MGET(n, M_WAIT, MT_DATA); 1731 if (m->m_len >= MINCLSIZE) { 1732 MCLGET(n, M_WAIT); 1733 } 1734 n->m_len = 0; 1735 break; 1736 } 1737 pm = &m->m_next; 1738 } 1739 1740 /* 1741 * If n is non-NULL, loop on m copying data, then replace the 1742 * portion of the chain that had to be realigned. 1743 */ 1744 if (n != NULL) { 1745 ++nfs_realign_count; 1746 while (m) { 1747 m_copyback(n, off, m->m_len, mtod(m, caddr_t)); 1748 off += m->m_len; 1749 m = m->m_next; 1750 } 1751 m_freem(*pm); 1752 *pm = n; 1753 } 1754 } 1755 1756 #ifndef NFS_NOSERVER 1757 1758 /* 1759 * Parse an RPC request 1760 * - verify it 1761 * - fill in the cred struct. 1762 */ 1763 int 1764 nfs_getreq(nd, nfsd, has_header) 1765 register struct nfsrv_descript *nd; 1766 struct nfsd *nfsd; 1767 int has_header; 1768 { 1769 register int len, i; 1770 register u_int32_t *tl; 1771 register int32_t t1; 1772 struct uio uio; 1773 struct iovec iov; 1774 caddr_t dpos, cp2, cp; 1775 u_int32_t nfsvers, auth_type; 1776 uid_t nickuid; 1777 int error = 0, nqnfs = 0, ticklen; 1778 struct mbuf *mrep, *md; 1779 register struct nfsuid *nuidp; 1780 struct timeval tvin, tvout; 1781 #if 0 /* until encrypted keys are implemented */ 1782 NFSKERBKEYSCHED_T keys; /* stores key schedule */ 1783 #endif 1784 1785 mrep = nd->nd_mrep; 1786 md = nd->nd_md; 1787 dpos = nd->nd_dpos; 1788 if (has_header) { 1789 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1790 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1791 if (*tl++ != rpc_call) { 1792 m_freem(mrep); 1793 return (EBADRPC); 1794 } 1795 } else 1796 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1797 nd->nd_repstat = 0; 1798 nd->nd_flag = 0; 1799 if (*tl++ != rpc_vers) { 1800 nd->nd_repstat = ERPCMISMATCH; 1801 nd->nd_procnum = NFSPROC_NOOP; 1802 return (0); 1803 } 1804 if (*tl != nfs_prog) { 1805 if (*tl == nqnfs_prog) 1806 nqnfs++; 1807 else { 1808 nd->nd_repstat = EPROGUNAVAIL; 1809 nd->nd_procnum = NFSPROC_NOOP; 1810 return (0); 1811 } 1812 } 1813 tl++; 1814 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1815 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1816 (nfsvers != NQNFS_VER3 && nqnfs)) { 1817 nd->nd_repstat = EPROGMISMATCH; 1818 nd->nd_procnum = NFSPROC_NOOP; 1819 return (0); 1820 } 1821 if (nqnfs) 1822 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1823 else if (nfsvers == NFS_VER3) 1824 nd->nd_flag = ND_NFSV3; 1825 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1826 if (nd->nd_procnum == NFSPROC_NULL) 1827 return (0); 1828 if (nd->nd_procnum >= NFS_NPROCS || 1829 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1830 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1831 nd->nd_repstat = EPROCUNAVAIL; 1832 nd->nd_procnum = NFSPROC_NOOP; 1833 return (0); 1834 } 1835 if ((nd->nd_flag & ND_NFSV3) == 0) 1836 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1837 auth_type = *tl++; 1838 len = fxdr_unsigned(int, *tl++); 1839 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1840 m_freem(mrep); 1841 return (EBADRPC); 1842 } 1843 1844 nd->nd_flag &= ~ND_KERBAUTH; 1845 /* 1846 * Handle auth_unix or auth_kerb. 1847 */ 1848 if (auth_type == rpc_auth_unix) { 1849 len = fxdr_unsigned(int, *++tl); 1850 if (len < 0 || len > NFS_MAXNAMLEN) { 1851 m_freem(mrep); 1852 return (EBADRPC); 1853 } 1854 nfsm_adv(nfsm_rndup(len)); 1855 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1856 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 1857 nd->nd_cr.cr_ref = 1; 1858 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1859 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1860 len = fxdr_unsigned(int, *tl); 1861 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1862 m_freem(mrep); 1863 return (EBADRPC); 1864 } 1865 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1866 for (i = 1; i <= len; i++) 1867 if (i < NGROUPS) 1868 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1869 else 1870 tl++; 1871 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 1872 if (nd->nd_cr.cr_ngroups > 1) 1873 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1874 len = fxdr_unsigned(int, *++tl); 1875 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1876 m_freem(mrep); 1877 return (EBADRPC); 1878 } 1879 if (len > 0) 1880 nfsm_adv(nfsm_rndup(len)); 1881 } else if (auth_type == rpc_auth_kerb) { 1882 switch (fxdr_unsigned(int, *tl++)) { 1883 case RPCAKN_FULLNAME: 1884 ticklen = fxdr_unsigned(int, *tl); 1885 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1886 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1887 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1888 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1889 m_freem(mrep); 1890 return (EBADRPC); 1891 } 1892 uio.uio_offset = 0; 1893 uio.uio_iov = &iov; 1894 uio.uio_iovcnt = 1; 1895 uio.uio_segflg = UIO_SYSSPACE; 1896 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1897 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1898 nfsm_mtouio(&uio, uio.uio_resid); 1899 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1900 if (*tl++ != rpc_auth_kerb || 1901 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1902 printf("Bad kerb verifier\n"); 1903 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1904 nd->nd_procnum = NFSPROC_NOOP; 1905 return (0); 1906 } 1907 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1908 tl = (u_int32_t *)cp; 1909 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1910 printf("Not fullname kerb verifier\n"); 1911 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1912 nd->nd_procnum = NFSPROC_NOOP; 1913 return (0); 1914 } 1915 cp += NFSX_UNSIGNED; 1916 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 1917 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1918 nd->nd_flag |= ND_KERBFULL; 1919 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1920 break; 1921 case RPCAKN_NICKNAME: 1922 if (len != 2 * NFSX_UNSIGNED) { 1923 printf("Kerb nickname short\n"); 1924 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1925 nd->nd_procnum = NFSPROC_NOOP; 1926 return (0); 1927 } 1928 nickuid = fxdr_unsigned(uid_t, *tl); 1929 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1930 if (*tl++ != rpc_auth_kerb || 1931 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1932 printf("Kerb nick verifier bad\n"); 1933 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1934 nd->nd_procnum = NFSPROC_NOOP; 1935 return (0); 1936 } 1937 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1938 tvin.tv_sec = *tl++; 1939 tvin.tv_usec = *tl; 1940 1941 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 1942 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1943 if (nuidp->nu_cr.cr_uid == nickuid && 1944 (!nd->nd_nam2 || 1945 netaddr_match(NU_NETFAM(nuidp), 1946 &nuidp->nu_haddr, nd->nd_nam2))) 1947 break; 1948 } 1949 if (!nuidp) { 1950 nd->nd_repstat = 1951 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1952 nd->nd_procnum = NFSPROC_NOOP; 1953 return (0); 1954 } 1955 1956 /* 1957 * Now, decrypt the timestamp using the session key 1958 * and validate it. 1959 */ 1960 #ifdef NFSKERB 1961 XXX 1962 #endif 1963 1964 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1965 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1966 if (nuidp->nu_expire < time_second || 1967 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1968 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1969 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1970 nuidp->nu_expire = 0; 1971 nd->nd_repstat = 1972 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1973 nd->nd_procnum = NFSPROC_NOOP; 1974 return (0); 1975 } 1976 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1977 nd->nd_flag |= ND_KERBNICK; 1978 }; 1979 } else { 1980 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1981 nd->nd_procnum = NFSPROC_NOOP; 1982 return (0); 1983 } 1984 1985 /* 1986 * For nqnfs, get piggybacked lease request. 1987 */ 1988 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1989 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1990 nd->nd_flag |= fxdr_unsigned(int, *tl); 1991 if (nd->nd_flag & ND_LEASE) { 1992 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1993 nd->nd_duration = fxdr_unsigned(int32_t, *tl); 1994 } else 1995 nd->nd_duration = NQ_MINLEASE; 1996 } else 1997 nd->nd_duration = NQ_MINLEASE; 1998 nd->nd_md = md; 1999 nd->nd_dpos = dpos; 2000 return (0); 2001 nfsmout: 2002 return (error); 2003 } 2004 2005 #endif 2006 2007 static int 2008 nfs_msg(p, server, msg) 2009 struct proc *p; 2010 char *server, *msg; 2011 { 2012 tpr_t tpr; 2013 2014 if (p) 2015 tpr = tprintf_open(p); 2016 else 2017 tpr = NULL; 2018 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2019 tprintf_close(tpr); 2020 return (0); 2021 } 2022 2023 #ifndef NFS_NOSERVER 2024 /* 2025 * Socket upcall routine for the nfsd sockets. 2026 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2027 * Essentially do as much as possible non-blocking, else punt and it will 2028 * be called with M_WAIT from an nfsd. 2029 */ 2030 void 2031 nfsrv_rcv(so, arg, waitflag) 2032 struct socket *so; 2033 void *arg; 2034 int waitflag; 2035 { 2036 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2037 register struct mbuf *m; 2038 struct mbuf *mp; 2039 struct sockaddr *nam; 2040 struct uio auio; 2041 int flags, error; 2042 2043 if ((slp->ns_flag & SLP_VALID) == 0) 2044 return; 2045 #ifdef notdef 2046 /* 2047 * Define this to test for nfsds handling this under heavy load. 2048 */ 2049 if (waitflag == M_DONTWAIT) { 2050 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 2051 } 2052 #endif 2053 auio.uio_procp = NULL; 2054 if (so->so_type == SOCK_STREAM) { 2055 /* 2056 * If there are already records on the queue, defer soreceive() 2057 * to an nfsd so that there is feedback to the TCP layer that 2058 * the nfs servers are heavily loaded. 2059 */ 2060 if (STAILQ_FIRST(&slp->ns_rec) && waitflag == M_DONTWAIT) { 2061 slp->ns_flag |= SLP_NEEDQ; 2062 goto dorecs; 2063 } 2064 2065 /* 2066 * Do soreceive(). 2067 */ 2068 auio.uio_resid = 1000000000; 2069 flags = MSG_DONTWAIT; 2070 error = so->so_proto->pr_usrreqs->pru_soreceive 2071 (so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 2072 if (error || mp == (struct mbuf *)0) { 2073 if (error == EWOULDBLOCK) 2074 slp->ns_flag |= SLP_NEEDQ; 2075 else 2076 slp->ns_flag |= SLP_DISCONN; 2077 goto dorecs; 2078 } 2079 m = mp; 2080 if (slp->ns_rawend) { 2081 slp->ns_rawend->m_next = m; 2082 slp->ns_cc += 1000000000 - auio.uio_resid; 2083 } else { 2084 slp->ns_raw = m; 2085 slp->ns_cc = 1000000000 - auio.uio_resid; 2086 } 2087 while (m->m_next) 2088 m = m->m_next; 2089 slp->ns_rawend = m; 2090 2091 /* 2092 * Now try and parse record(s) out of the raw stream data. 2093 */ 2094 error = nfsrv_getstream(slp, waitflag); 2095 if (error) { 2096 if (error == EPERM) 2097 slp->ns_flag |= SLP_DISCONN; 2098 else 2099 slp->ns_flag |= SLP_NEEDQ; 2100 } 2101 } else { 2102 do { 2103 auio.uio_resid = 1000000000; 2104 flags = MSG_DONTWAIT; 2105 error = so->so_proto->pr_usrreqs->pru_soreceive 2106 (so, &nam, &auio, &mp, 2107 (struct mbuf **)0, &flags); 2108 if (mp) { 2109 struct nfsrv_rec *rec; 2110 rec = malloc(sizeof(struct nfsrv_rec), 2111 M_NFSRVDESC, waitflag); 2112 if (!rec) { 2113 if (nam) 2114 FREE(nam, M_SONAME); 2115 m_freem(mp); 2116 continue; 2117 } 2118 nfs_realign(&mp, 10 * NFSX_UNSIGNED); 2119 rec->nr_address = nam; 2120 rec->nr_packet = mp; 2121 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2122 } 2123 if (error) { 2124 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2125 && error != EWOULDBLOCK) { 2126 slp->ns_flag |= SLP_DISCONN; 2127 goto dorecs; 2128 } 2129 } 2130 } while (mp); 2131 } 2132 2133 /* 2134 * Now try and process the request records, non-blocking. 2135 */ 2136 dorecs: 2137 if (waitflag == M_DONTWAIT && 2138 (STAILQ_FIRST(&slp->ns_rec) 2139 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2140 nfsrv_wakenfsd(slp); 2141 } 2142 2143 /* 2144 * Try and extract an RPC request from the mbuf data list received on a 2145 * stream socket. The "waitflag" argument indicates whether or not it 2146 * can sleep. 2147 */ 2148 static int 2149 nfsrv_getstream(slp, waitflag) 2150 register struct nfssvc_sock *slp; 2151 int waitflag; 2152 { 2153 register struct mbuf *m, **mpp; 2154 register char *cp1, *cp2; 2155 register int len; 2156 struct mbuf *om, *m2, *recm; 2157 u_int32_t recmark; 2158 2159 if (slp->ns_flag & SLP_GETSTREAM) 2160 panic("nfs getstream"); 2161 slp->ns_flag |= SLP_GETSTREAM; 2162 for (;;) { 2163 if (slp->ns_reclen == 0) { 2164 if (slp->ns_cc < NFSX_UNSIGNED) { 2165 slp->ns_flag &= ~SLP_GETSTREAM; 2166 return (0); 2167 } 2168 m = slp->ns_raw; 2169 if (m->m_len >= NFSX_UNSIGNED) { 2170 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 2171 m->m_data += NFSX_UNSIGNED; 2172 m->m_len -= NFSX_UNSIGNED; 2173 } else { 2174 cp1 = (caddr_t)&recmark; 2175 cp2 = mtod(m, caddr_t); 2176 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2177 while (m->m_len == 0) { 2178 m = m->m_next; 2179 cp2 = mtod(m, caddr_t); 2180 } 2181 *cp1++ = *cp2++; 2182 m->m_data++; 2183 m->m_len--; 2184 } 2185 } 2186 slp->ns_cc -= NFSX_UNSIGNED; 2187 recmark = ntohl(recmark); 2188 slp->ns_reclen = recmark & ~0x80000000; 2189 if (recmark & 0x80000000) 2190 slp->ns_flag |= SLP_LASTFRAG; 2191 else 2192 slp->ns_flag &= ~SLP_LASTFRAG; 2193 if (slp->ns_reclen > NFS_MAXPACKET) { 2194 slp->ns_flag &= ~SLP_GETSTREAM; 2195 return (EPERM); 2196 } 2197 } 2198 2199 /* 2200 * Now get the record part. 2201 * 2202 * Note that slp->ns_reclen may be 0. Linux sometimes 2203 * generates 0-length RPCs 2204 */ 2205 recm = NULL; 2206 if (slp->ns_cc == slp->ns_reclen) { 2207 recm = slp->ns_raw; 2208 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2209 slp->ns_cc = slp->ns_reclen = 0; 2210 } else if (slp->ns_cc > slp->ns_reclen) { 2211 len = 0; 2212 m = slp->ns_raw; 2213 om = (struct mbuf *)0; 2214 2215 while (len < slp->ns_reclen) { 2216 if ((len + m->m_len) > slp->ns_reclen) { 2217 m2 = m_copym(m, 0, slp->ns_reclen - len, 2218 waitflag); 2219 if (m2) { 2220 if (om) { 2221 om->m_next = m2; 2222 recm = slp->ns_raw; 2223 } else 2224 recm = m2; 2225 m->m_data += slp->ns_reclen - len; 2226 m->m_len -= slp->ns_reclen - len; 2227 len = slp->ns_reclen; 2228 } else { 2229 slp->ns_flag &= ~SLP_GETSTREAM; 2230 return (EWOULDBLOCK); 2231 } 2232 } else if ((len + m->m_len) == slp->ns_reclen) { 2233 om = m; 2234 len += m->m_len; 2235 m = m->m_next; 2236 recm = slp->ns_raw; 2237 om->m_next = (struct mbuf *)0; 2238 } else { 2239 om = m; 2240 len += m->m_len; 2241 m = m->m_next; 2242 } 2243 } 2244 slp->ns_raw = m; 2245 slp->ns_cc -= len; 2246 slp->ns_reclen = 0; 2247 } else { 2248 slp->ns_flag &= ~SLP_GETSTREAM; 2249 return (0); 2250 } 2251 2252 /* 2253 * Accumulate the fragments into a record. 2254 */ 2255 mpp = &slp->ns_frag; 2256 while (*mpp) 2257 mpp = &((*mpp)->m_next); 2258 *mpp = recm; 2259 if (slp->ns_flag & SLP_LASTFRAG) { 2260 struct nfsrv_rec *rec; 2261 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, waitflag); 2262 if (!rec) { 2263 m_freem(slp->ns_frag); 2264 } else { 2265 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); 2266 rec->nr_address = (struct sockaddr *)0; 2267 rec->nr_packet = slp->ns_frag; 2268 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2269 } 2270 slp->ns_frag = (struct mbuf *)0; 2271 } 2272 } 2273 } 2274 2275 /* 2276 * Parse an RPC header. 2277 */ 2278 int 2279 nfsrv_dorec(slp, nfsd, ndp) 2280 register struct nfssvc_sock *slp; 2281 struct nfsd *nfsd; 2282 struct nfsrv_descript **ndp; 2283 { 2284 struct nfsrv_rec *rec; 2285 register struct mbuf *m; 2286 struct sockaddr *nam; 2287 register struct nfsrv_descript *nd; 2288 int error; 2289 2290 *ndp = NULL; 2291 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) 2292 return (ENOBUFS); 2293 rec = STAILQ_FIRST(&slp->ns_rec); 2294 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 2295 nam = rec->nr_address; 2296 m = rec->nr_packet; 2297 free(rec, M_NFSRVDESC); 2298 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2299 M_NFSRVDESC, M_WAITOK); 2300 nd->nd_md = nd->nd_mrep = m; 2301 nd->nd_nam2 = nam; 2302 nd->nd_dpos = mtod(m, caddr_t); 2303 error = nfs_getreq(nd, nfsd, TRUE); 2304 if (error) { 2305 if (nam) { 2306 FREE(nam, M_SONAME); 2307 } 2308 free((caddr_t)nd, M_NFSRVDESC); 2309 return (error); 2310 } 2311 *ndp = nd; 2312 nfsd->nfsd_nd = nd; 2313 return (0); 2314 } 2315 2316 /* 2317 * Search for a sleeping nfsd and wake it up. 2318 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2319 * running nfsds will go look for the work in the nfssvc_sock list. 2320 */ 2321 void 2322 nfsrv_wakenfsd(slp) 2323 struct nfssvc_sock *slp; 2324 { 2325 register struct nfsd *nd; 2326 2327 if ((slp->ns_flag & SLP_VALID) == 0) 2328 return; 2329 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) { 2330 if (nd->nfsd_flag & NFSD_WAITING) { 2331 nd->nfsd_flag &= ~NFSD_WAITING; 2332 if (nd->nfsd_slp) 2333 panic("nfsd wakeup"); 2334 slp->ns_sref++; 2335 nd->nfsd_slp = slp; 2336 wakeup((caddr_t)nd); 2337 return; 2338 } 2339 } 2340 slp->ns_flag |= SLP_DOREC; 2341 nfsd_head_flag |= NFSD_CHECKSLP; 2342 } 2343 #endif /* NFS_NOSERVER */ 2344