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 1.45 2007/05/18 17:05:13 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/fcntl.h> 54 #include <sys/protosw.h> 55 #include <sys/resourcevar.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/socketops.h> 59 #include <sys/syslog.h> 60 #include <sys/thread.h> 61 #include <sys/tprintf.h> 62 #include <sys/sysctl.h> 63 #include <sys/signalvar.h> 64 #include <sys/signal2.h> 65 66 #include <netinet/in.h> 67 #include <netinet/tcp.h> 68 #include <sys/thread2.h> 69 70 #include "rpcv2.h" 71 #include "nfsproto.h" 72 #include "nfs.h" 73 #include "xdr_subs.h" 74 #include "nfsm_subs.h" 75 #include "nfsmount.h" 76 #include "nfsnode.h" 77 #include "nfsrtt.h" 78 79 #define TRUE 1 80 #define FALSE 0 81 82 /* 83 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 84 * Use the mean and mean deviation of rtt for the appropriate type of rpc 85 * for the frequent rpcs and a default for the others. 86 * The justification for doing "other" this way is that these rpcs 87 * happen so infrequently that timer est. would probably be stale. 88 * Also, since many of these rpcs are 89 * non-idempotent, a conservative timeout is desired. 90 * getattr, lookup - A+2D 91 * read, write - A+4D 92 * other - nm_timeo 93 */ 94 #define NFS_RTO(n, t) \ 95 ((t) == 0 ? (n)->nm_timeo : \ 96 ((t) < 3 ? \ 97 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 98 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 99 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 100 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 101 /* 102 * External data, mostly RPC constants in XDR form 103 */ 104 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 105 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 106 rpc_auth_kerb; 107 extern u_int32_t nfs_prog; 108 extern struct nfsstats nfsstats; 109 extern int nfsv3_procid[NFS_NPROCS]; 110 extern int nfs_ticks; 111 112 /* 113 * Defines which timer to use for the procnum. 114 * 0 - default 115 * 1 - getattr 116 * 2 - lookup 117 * 3 - read 118 * 4 - write 119 */ 120 static int proct[NFS_NPROCS] = { 121 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 122 0, 0, 0, 123 }; 124 125 static int nfs_realign_test; 126 static int nfs_realign_count; 127 static int nfs_bufpackets = 4; 128 static int nfs_timer_raced; 129 130 SYSCTL_DECL(_vfs_nfs); 131 132 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, ""); 133 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, ""); 134 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, ""); 135 136 137 /* 138 * There is a congestion window for outstanding rpcs maintained per mount 139 * point. The cwnd size is adjusted in roughly the way that: 140 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 141 * SIGCOMM '88". ACM, August 1988. 142 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 143 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 144 * of rpcs is in progress. 145 * (The sent count and cwnd are scaled for integer arith.) 146 * Variants of "slow start" were tried and were found to be too much of a 147 * performance hit (ave. rtt 3 times larger), 148 * I suspect due to the large rtt that nfs rpcs have. 149 */ 150 #define NFS_CWNDSCALE 256 151 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 152 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 153 int nfsrtton = 0; 154 struct nfsrtt nfsrtt; 155 struct callout nfs_timer_handle; 156 157 static int nfs_msg (struct thread *,char *,char *); 158 static int nfs_rcvlock (struct nfsreq *); 159 static void nfs_rcvunlock (struct nfsreq *); 160 static void nfs_realign (struct mbuf **pm, int hsiz); 161 static int nfs_receive (struct nfsreq *rep, struct sockaddr **aname, 162 struct mbuf **mp); 163 static void nfs_softterm (struct nfsreq *rep); 164 static int nfs_reconnect (struct nfsreq *rep); 165 #ifndef NFS_NOSERVER 166 static int nfsrv_getstream (struct nfssvc_sock *, int, int *); 167 168 int (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd, 169 struct nfssvc_sock *slp, 170 struct thread *td, 171 struct mbuf **mreqp) = { 172 nfsrv_null, 173 nfsrv_getattr, 174 nfsrv_setattr, 175 nfsrv_lookup, 176 nfsrv3_access, 177 nfsrv_readlink, 178 nfsrv_read, 179 nfsrv_write, 180 nfsrv_create, 181 nfsrv_mkdir, 182 nfsrv_symlink, 183 nfsrv_mknod, 184 nfsrv_remove, 185 nfsrv_rmdir, 186 nfsrv_rename, 187 nfsrv_link, 188 nfsrv_readdir, 189 nfsrv_readdirplus, 190 nfsrv_statfs, 191 nfsrv_fsinfo, 192 nfsrv_pathconf, 193 nfsrv_commit, 194 nfsrv_noop, 195 nfsrv_noop, 196 nfsrv_noop, 197 nfsrv_noop 198 }; 199 #endif /* NFS_NOSERVER */ 200 201 /* 202 * Initialize sockets and congestion for a new NFS connection. 203 * We do not free the sockaddr if error. 204 */ 205 int 206 nfs_connect(struct nfsmount *nmp, struct nfsreq *rep) 207 { 208 struct socket *so; 209 int error, rcvreserve, sndreserve; 210 int pktscale; 211 struct sockaddr *saddr; 212 struct sockaddr_in *sin; 213 struct thread *td = &thread0; /* only used for socreate and sobind */ 214 215 nmp->nm_so = NULL; 216 saddr = nmp->nm_nam; 217 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 218 nmp->nm_soproto, td); 219 if (error) 220 goto bad; 221 so = nmp->nm_so; 222 nmp->nm_soflags = so->so_proto->pr_flags; 223 224 /* 225 * Some servers require that the client port be a reserved port number. 226 */ 227 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 228 struct sockopt sopt; 229 int ip; 230 struct sockaddr_in ssin; 231 232 bzero(&sopt, sizeof sopt); 233 ip = IP_PORTRANGE_LOW; 234 sopt.sopt_level = IPPROTO_IP; 235 sopt.sopt_name = IP_PORTRANGE; 236 sopt.sopt_val = (void *)&ip; 237 sopt.sopt_valsize = sizeof(ip); 238 sopt.sopt_td = NULL; 239 error = sosetopt(so, &sopt); 240 if (error) 241 goto bad; 242 bzero(&ssin, sizeof ssin); 243 sin = &ssin; 244 sin->sin_len = sizeof (struct sockaddr_in); 245 sin->sin_family = AF_INET; 246 sin->sin_addr.s_addr = INADDR_ANY; 247 sin->sin_port = htons(0); 248 error = sobind(so, (struct sockaddr *)sin, td); 249 if (error) 250 goto bad; 251 bzero(&sopt, sizeof sopt); 252 ip = IP_PORTRANGE_DEFAULT; 253 sopt.sopt_level = IPPROTO_IP; 254 sopt.sopt_name = IP_PORTRANGE; 255 sopt.sopt_val = (void *)&ip; 256 sopt.sopt_valsize = sizeof(ip); 257 sopt.sopt_td = NULL; 258 error = sosetopt(so, &sopt); 259 if (error) 260 goto bad; 261 } 262 263 /* 264 * Protocols that do not require connections may be optionally left 265 * unconnected for servers that reply from a port other than NFS_PORT. 266 */ 267 if (nmp->nm_flag & NFSMNT_NOCONN) { 268 if (nmp->nm_soflags & PR_CONNREQUIRED) { 269 error = ENOTCONN; 270 goto bad; 271 } 272 } else { 273 error = soconnect(so, nmp->nm_nam, td); 274 if (error) 275 goto bad; 276 277 /* 278 * Wait for the connection to complete. Cribbed from the 279 * connect system call but with the wait timing out so 280 * that interruptible mounts don't hang here for a long time. 281 */ 282 crit_enter(); 283 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 284 (void) tsleep((caddr_t)&so->so_timeo, 0, 285 "nfscon", 2 * hz); 286 if ((so->so_state & SS_ISCONNECTING) && 287 so->so_error == 0 && rep && 288 (error = nfs_sigintr(nmp, rep, rep->r_td)) != 0){ 289 so->so_state &= ~SS_ISCONNECTING; 290 crit_exit(); 291 goto bad; 292 } 293 } 294 if (so->so_error) { 295 error = so->so_error; 296 so->so_error = 0; 297 crit_exit(); 298 goto bad; 299 } 300 crit_exit(); 301 } 302 so->so_rcv.ssb_timeo = (5 * hz); 303 so->so_snd.ssb_timeo = (5 * hz); 304 305 /* 306 * Get buffer reservation size from sysctl, but impose reasonable 307 * limits. 308 */ 309 pktscale = nfs_bufpackets; 310 if (pktscale < 2) 311 pktscale = 2; 312 if (pktscale > 64) 313 pktscale = 64; 314 315 if (nmp->nm_sotype == SOCK_DGRAM) { 316 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; 317 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 318 NFS_MAXPKTHDR) * pktscale; 319 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 320 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; 321 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 322 NFS_MAXPKTHDR) * pktscale; 323 } else { 324 if (nmp->nm_sotype != SOCK_STREAM) 325 panic("nfscon sotype"); 326 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 327 struct sockopt sopt; 328 int val; 329 330 bzero(&sopt, sizeof sopt); 331 sopt.sopt_level = SOL_SOCKET; 332 sopt.sopt_name = SO_KEEPALIVE; 333 sopt.sopt_val = &val; 334 sopt.sopt_valsize = sizeof val; 335 val = 1; 336 sosetopt(so, &sopt); 337 } 338 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 339 struct sockopt sopt; 340 int val; 341 342 bzero(&sopt, sizeof sopt); 343 sopt.sopt_level = IPPROTO_TCP; 344 sopt.sopt_name = TCP_NODELAY; 345 sopt.sopt_val = &val; 346 sopt.sopt_valsize = sizeof val; 347 val = 1; 348 sosetopt(so, &sopt); 349 } 350 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 351 sizeof (u_int32_t)) * pktscale; 352 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 353 sizeof (u_int32_t)) * pktscale; 354 } 355 error = soreserve(so, sndreserve, rcvreserve, 356 &td->td_proc->p_rlimit[RLIMIT_SBSIZE]); 357 if (error) 358 goto bad; 359 so->so_rcv.ssb_flags |= SSB_NOINTR; 360 so->so_snd.ssb_flags |= SSB_NOINTR; 361 362 /* Initialize other non-zero congestion variables */ 363 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = 364 nmp->nm_srtt[3] = (NFS_TIMEO << 3); 365 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 366 nmp->nm_sdrtt[3] = 0; 367 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 368 nmp->nm_sent = 0; 369 nmp->nm_timeouts = 0; 370 return (0); 371 372 bad: 373 nfs_disconnect(nmp); 374 return (error); 375 } 376 377 /* 378 * Reconnect routine: 379 * Called when a connection is broken on a reliable protocol. 380 * - clean up the old socket 381 * - nfs_connect() again 382 * - set R_MUSTRESEND for all outstanding requests on mount point 383 * If this fails the mount point is DEAD! 384 * nb: Must be called with the nfs_sndlock() set on the mount point. 385 */ 386 static int 387 nfs_reconnect(struct nfsreq *rep) 388 { 389 struct nfsreq *rp; 390 struct nfsmount *nmp = rep->r_nmp; 391 int error; 392 393 nfs_disconnect(nmp); 394 while ((error = nfs_connect(nmp, rep)) != 0) { 395 if (error == EINTR || error == ERESTART) 396 return (EINTR); 397 (void) tsleep((caddr_t)&lbolt, 0, "nfscon", 0); 398 } 399 400 /* 401 * Loop through outstanding request list and fix up all requests 402 * on old socket. 403 */ 404 crit_enter(); 405 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 406 if (rp->r_nmp == nmp) 407 rp->r_flags |= R_MUSTRESEND; 408 } 409 crit_exit(); 410 return (0); 411 } 412 413 /* 414 * NFS disconnect. Clean up and unlink. 415 */ 416 void 417 nfs_disconnect(struct nfsmount *nmp) 418 { 419 struct socket *so; 420 421 if (nmp->nm_so) { 422 so = nmp->nm_so; 423 nmp->nm_so = NULL; 424 soshutdown(so, SHUT_RDWR); 425 soclose(so, FNONBLOCK); 426 } 427 } 428 429 void 430 nfs_safedisconnect(struct nfsmount *nmp) 431 { 432 struct nfsreq dummyreq; 433 434 bzero(&dummyreq, sizeof(dummyreq)); 435 dummyreq.r_nmp = nmp; 436 dummyreq.r_td = NULL; 437 nfs_rcvlock(&dummyreq); 438 nfs_disconnect(nmp); 439 nfs_rcvunlock(&dummyreq); 440 } 441 442 /* 443 * This is the nfs send routine. For connection based socket types, it 444 * must be called with an nfs_sndlock() on the socket. 445 * "rep == NULL" indicates that it has been called from a server. 446 * For the client side: 447 * - return EINTR if the RPC is terminated, 0 otherwise 448 * - set R_MUSTRESEND if the send fails for any reason 449 * - do any cleanup required by recoverable socket errors (?) 450 * For the server side: 451 * - return EINTR or ERESTART if interrupted by a signal 452 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 453 * - do any cleanup required by recoverable socket errors (?) 454 */ 455 int 456 nfs_send(struct socket *so, struct sockaddr *nam, struct mbuf *top, 457 struct nfsreq *rep) 458 { 459 struct sockaddr *sendnam; 460 int error, soflags, flags; 461 462 if (rep) { 463 if (rep->r_flags & R_SOFTTERM) { 464 m_freem(top); 465 return (EINTR); 466 } 467 if ((so = rep->r_nmp->nm_so) == NULL) { 468 rep->r_flags |= R_MUSTRESEND; 469 m_freem(top); 470 return (0); 471 } 472 rep->r_flags &= ~R_MUSTRESEND; 473 soflags = rep->r_nmp->nm_soflags; 474 } else 475 soflags = so->so_proto->pr_flags; 476 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 477 sendnam = NULL; 478 else 479 sendnam = nam; 480 if (so->so_type == SOCK_SEQPACKET) 481 flags = MSG_EOR; 482 else 483 flags = 0; 484 485 error = so_pru_sosend(so, sendnam, NULL, top, NULL, flags, 486 curthread /*XXX*/); 487 /* 488 * ENOBUFS for dgram sockets is transient and non fatal. 489 * No need to log, and no need to break a soft mount. 490 */ 491 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 492 error = 0; 493 if (rep) /* do backoff retransmit on client */ 494 rep->r_flags |= R_MUSTRESEND; 495 } 496 497 if (error) { 498 if (rep) { 499 log(LOG_INFO, "nfs send error %d for server %s\n",error, 500 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 501 /* 502 * Deal with errors for the client side. 503 */ 504 if (rep->r_flags & R_SOFTTERM) 505 error = EINTR; 506 else 507 rep->r_flags |= R_MUSTRESEND; 508 } else 509 log(LOG_INFO, "nfsd send error %d\n", error); 510 511 /* 512 * Handle any recoverable (soft) socket errors here. (?) 513 */ 514 if (error != EINTR && error != ERESTART && 515 error != EWOULDBLOCK && error != EPIPE) 516 error = 0; 517 } 518 return (error); 519 } 520 521 /* 522 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 523 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 524 * Mark and consolidate the data into a new mbuf list. 525 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 526 * small mbufs. 527 * For SOCK_STREAM we must be very careful to read an entire record once 528 * we have read any of it, even if the system call has been interrupted. 529 */ 530 static int 531 nfs_receive(struct nfsreq *rep, struct sockaddr **aname, struct mbuf **mp) 532 { 533 struct socket *so; 534 struct sockbuf sio; 535 struct uio auio; 536 struct iovec aio; 537 struct mbuf *m; 538 struct mbuf *control; 539 u_int32_t len; 540 struct sockaddr **getnam; 541 int error, sotype, rcvflg; 542 struct thread *td = curthread; /* XXX */ 543 544 /* 545 * Set up arguments for soreceive() 546 */ 547 *mp = NULL; 548 *aname = NULL; 549 sotype = rep->r_nmp->nm_sotype; 550 551 /* 552 * For reliable protocols, lock against other senders/receivers 553 * in case a reconnect is necessary. 554 * For SOCK_STREAM, first get the Record Mark to find out how much 555 * more there is to get. 556 * We must lock the socket against other receivers 557 * until we have an entire rpc request/reply. 558 */ 559 if (sotype != SOCK_DGRAM) { 560 error = nfs_sndlock(rep); 561 if (error) 562 return (error); 563 tryagain: 564 /* 565 * Check for fatal errors and resending request. 566 */ 567 /* 568 * Ugh: If a reconnect attempt just happened, nm_so 569 * would have changed. NULL indicates a failed 570 * attempt that has essentially shut down this 571 * mount point. 572 */ 573 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 574 nfs_sndunlock(rep); 575 return (EINTR); 576 } 577 so = rep->r_nmp->nm_so; 578 if (!so) { 579 error = nfs_reconnect(rep); 580 if (error) { 581 nfs_sndunlock(rep); 582 return (error); 583 } 584 goto tryagain; 585 } 586 while (rep->r_flags & R_MUSTRESEND) { 587 m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_WAIT); 588 nfsstats.rpcretries++; 589 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 590 if (error) { 591 if (error == EINTR || error == ERESTART || 592 (error = nfs_reconnect(rep)) != 0) { 593 nfs_sndunlock(rep); 594 return (error); 595 } 596 goto tryagain; 597 } 598 } 599 nfs_sndunlock(rep); 600 if (sotype == SOCK_STREAM) { 601 /* 602 * Get the length marker from the stream 603 */ 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_td = td; 613 do { 614 rcvflg = MSG_WAITALL; 615 error = so_pru_soreceive(so, NULL, &auio, NULL, 616 NULL, &rcvflg); 617 if (error == EWOULDBLOCK && rep) { 618 if (rep->r_flags & R_SOFTTERM) 619 return (EINTR); 620 } 621 } while (error == EWOULDBLOCK); 622 623 if (error == 0 && auio.uio_resid > 0) { 624 /* 625 * Only log short packets if not EOF 626 */ 627 if (auio.uio_resid != sizeof(u_int32_t)) 628 log(LOG_INFO, 629 "short receive (%d/%d) from nfs server %s\n", 630 (int)(sizeof(u_int32_t) - auio.uio_resid), 631 (int)sizeof(u_int32_t), 632 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 633 error = EPIPE; 634 } 635 if (error) 636 goto errout; 637 len = ntohl(len) & ~0x80000000; 638 /* 639 * This is SERIOUS! We are out of sync with the sender 640 * and forcing a disconnect/reconnect is all I can do. 641 */ 642 if (len > NFS_MAXPACKET) { 643 log(LOG_ERR, "%s (%d) from nfs server %s\n", 644 "impossible packet length", 645 len, 646 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 647 error = EFBIG; 648 goto errout; 649 } 650 651 /* 652 * Get the rest of the packet as an mbuf chain 653 */ 654 sbinit(&sio, len); 655 do { 656 rcvflg = MSG_WAITALL; 657 error = so_pru_soreceive(so, NULL, NULL, &sio, 658 NULL, &rcvflg); 659 } while (error == EWOULDBLOCK || error == EINTR || 660 error == ERESTART); 661 if (error == 0 && sio.sb_cc != len) { 662 if (sio.sb_cc != 0) 663 log(LOG_INFO, 664 "short receive (%d/%d) from nfs server %s\n", 665 len - auio.uio_resid, len, 666 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 667 error = EPIPE; 668 } 669 *mp = sio.sb_mb; 670 } else { 671 /* 672 * Non-stream, so get the whole packet by not 673 * specifying MSG_WAITALL and by specifying a large 674 * length. 675 * 676 * We have no use for control msg., but must grab them 677 * and then throw them away so we know what is going 678 * on. 679 */ 680 sbinit(&sio, 100000000); 681 do { 682 rcvflg = 0; 683 error = so_pru_soreceive(so, NULL, NULL, &sio, 684 &control, &rcvflg); 685 if (control) 686 m_freem(control); 687 if (error == EWOULDBLOCK && rep) { 688 if (rep->r_flags & R_SOFTTERM) { 689 m_freem(sio.sb_mb); 690 return (EINTR); 691 } 692 } 693 } while (error == EWOULDBLOCK || 694 (error == 0 && sio.sb_mb == NULL && control)); 695 if ((rcvflg & MSG_EOR) == 0) 696 kprintf("Egad!!\n"); 697 if (error == 0 && sio.sb_mb == NULL) 698 error = EPIPE; 699 len = sio.sb_cc; 700 *mp = sio.sb_mb; 701 } 702 errout: 703 if (error && error != EINTR && error != ERESTART) { 704 m_freem(*mp); 705 *mp = NULL; 706 if (error != EPIPE) { 707 log(LOG_INFO, 708 "receive error %d from nfs server %s\n", 709 error, 710 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 711 } 712 error = nfs_sndlock(rep); 713 if (!error) { 714 error = nfs_reconnect(rep); 715 if (!error) 716 goto tryagain; 717 else 718 nfs_sndunlock(rep); 719 } 720 } 721 } else { 722 if ((so = rep->r_nmp->nm_so) == NULL) 723 return (EACCES); 724 if (so->so_state & SS_ISCONNECTED) 725 getnam = NULL; 726 else 727 getnam = aname; 728 sbinit(&sio, 100000000); 729 do { 730 rcvflg = 0; 731 error = so_pru_soreceive(so, getnam, NULL, &sio, 732 NULL, &rcvflg); 733 if (error == EWOULDBLOCK && 734 (rep->r_flags & R_SOFTTERM)) { 735 m_freem(sio.sb_mb); 736 return (EINTR); 737 } 738 } while (error == EWOULDBLOCK); 739 len = sio.sb_cc; 740 *mp = sio.sb_mb; 741 } 742 if (error) { 743 m_freem(*mp); 744 *mp = NULL; 745 } 746 /* 747 * Search for any mbufs that are not a multiple of 4 bytes long 748 * or with m_data not longword aligned. 749 * These could cause pointer alignment problems, so copy them to 750 * well aligned mbufs. 751 */ 752 nfs_realign(mp, 5 * NFSX_UNSIGNED); 753 return (error); 754 } 755 756 /* 757 * Implement receipt of reply on a socket. 758 * We must search through the list of received datagrams matching them 759 * with outstanding requests using the xid, until ours is found. 760 */ 761 /* ARGSUSED */ 762 int 763 nfs_reply(struct nfsreq *myrep) 764 { 765 struct nfsreq *rep; 766 struct nfsmount *nmp = myrep->r_nmp; 767 int32_t t1; 768 struct mbuf *mrep, *md; 769 struct sockaddr *nam; 770 u_int32_t rxid, *tl; 771 caddr_t dpos, cp2; 772 int error; 773 774 /* 775 * Loop around until we get our own reply 776 */ 777 for (;;) { 778 /* 779 * Lock against other receivers so that I don't get stuck in 780 * sbwait() after someone else has received my reply for me. 781 * Also necessary for connection based protocols to avoid 782 * race conditions during a reconnect. 783 * If nfs_rcvlock() returns EALREADY, that means that 784 * the reply has already been recieved by another 785 * process and we can return immediately. In this 786 * case, the lock is not taken to avoid races with 787 * other processes. 788 */ 789 error = nfs_rcvlock(myrep); 790 if (error == EALREADY) 791 return (0); 792 if (error) 793 return (error); 794 /* 795 * Get the next Rpc reply off the socket 796 */ 797 error = nfs_receive(myrep, &nam, &mrep); 798 nfs_rcvunlock(myrep); 799 if (error) { 800 /* 801 * Ignore routing errors on connectionless protocols?? 802 */ 803 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 804 nmp->nm_so->so_error = 0; 805 if (myrep->r_flags & R_GETONEREP) 806 return (0); 807 continue; 808 } 809 return (error); 810 } 811 if (nam) 812 FREE(nam, M_SONAME); 813 814 /* 815 * Get the xid and check that it is an rpc reply 816 */ 817 md = mrep; 818 dpos = mtod(md, caddr_t); 819 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 820 rxid = *tl++; 821 if (*tl != rpc_reply) { 822 nfsstats.rpcinvalid++; 823 m_freem(mrep); 824 nfsmout: 825 if (myrep->r_flags & R_GETONEREP) 826 return (0); 827 continue; 828 } 829 830 /* 831 * Loop through the request list to match up the reply 832 * Iff no match, just drop the datagram. On match, set 833 * r_mrep atomically to prevent the timer from messing 834 * around with the request after we have exited the critical 835 * section. 836 */ 837 crit_enter(); 838 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 839 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 840 rep->r_mrep = mrep; 841 break; 842 } 843 } 844 crit_exit(); 845 846 /* 847 * Fill in the rest of the reply if we found a match. 848 */ 849 if (rep) { 850 rep->r_md = md; 851 rep->r_dpos = dpos; 852 if (nfsrtton) { 853 struct rttl *rt; 854 855 rt = &nfsrtt.rttl[nfsrtt.pos]; 856 rt->proc = rep->r_procnum; 857 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 858 rt->sent = nmp->nm_sent; 859 rt->cwnd = nmp->nm_cwnd; 860 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 861 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 862 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 863 getmicrotime(&rt->tstamp); 864 if (rep->r_flags & R_TIMING) 865 rt->rtt = rep->r_rtt; 866 else 867 rt->rtt = 1000000; 868 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 869 } 870 /* 871 * Update congestion window. 872 * Do the additive increase of 873 * one rpc/rtt. 874 */ 875 if (nmp->nm_cwnd <= nmp->nm_sent) { 876 nmp->nm_cwnd += 877 (NFS_CWNDSCALE * NFS_CWNDSCALE + 878 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 879 if (nmp->nm_cwnd > NFS_MAXCWND) 880 nmp->nm_cwnd = NFS_MAXCWND; 881 } 882 crit_enter(); /* nfs_timer interlock for nm_sent */ 883 if (rep->r_flags & R_SENT) { 884 rep->r_flags &= ~R_SENT; 885 nmp->nm_sent -= NFS_CWNDSCALE; 886 } 887 crit_exit(); 888 /* 889 * Update rtt using a gain of 0.125 on the mean 890 * and a gain of 0.25 on the deviation. 891 */ 892 if (rep->r_flags & R_TIMING) { 893 /* 894 * Since the timer resolution of 895 * NFS_HZ is so course, it can often 896 * result in r_rtt == 0. Since 897 * r_rtt == N means that the actual 898 * rtt is between N+dt and N+2-dt ticks, 899 * add 1. 900 */ 901 t1 = rep->r_rtt + 1; 902 t1 -= (NFS_SRTT(rep) >> 3); 903 NFS_SRTT(rep) += t1; 904 if (t1 < 0) 905 t1 = -t1; 906 t1 -= (NFS_SDRTT(rep) >> 2); 907 NFS_SDRTT(rep) += t1; 908 } 909 nmp->nm_timeouts = 0; 910 } 911 /* 912 * If not matched to a request, drop it. 913 * If it's mine, get out. 914 */ 915 if (rep == NULL) { 916 nfsstats.rpcunexpected++; 917 m_freem(mrep); 918 } else if (rep == myrep) { 919 if (rep->r_mrep == NULL) 920 panic("nfsreply nil"); 921 return (0); 922 } 923 if (myrep->r_flags & R_GETONEREP) 924 return (0); 925 } 926 } 927 928 /* 929 * nfs_request - goes something like this 930 * - fill in request struct 931 * - links it into list 932 * - calls nfs_send() for first transmit 933 * - calls nfs_receive() to get reply 934 * - break down rpc header and return with nfs reply pointed to 935 * by mrep or error 936 * nb: always frees up mreq mbuf list 937 */ 938 int 939 nfs_request(struct vnode *vp, struct mbuf *mrest, int procnum, 940 struct thread *td, struct ucred *cred, struct mbuf **mrp, 941 struct mbuf **mdp, caddr_t *dposp) 942 { 943 struct mbuf *mrep, *m2; 944 struct nfsreq *rep; 945 u_int32_t *tl; 946 int i; 947 struct nfsmount *nmp; 948 struct mbuf *m, *md, *mheadend; 949 char nickv[RPCX_NICKVERF]; 950 time_t waituntil; 951 caddr_t dpos, cp2; 952 int t1, error = 0, mrest_len, auth_len, auth_type; 953 int trylater_delay = 15, trylater_cnt = 0, failed_auth = 0; 954 int verf_len, verf_type; 955 u_int32_t xid; 956 char *auth_str, *verf_str; 957 NFSKERBKEY_T key; /* save session key */ 958 959 /* Reject requests while attempting a forced unmount. */ 960 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { 961 m_freem(mrest); 962 return (ESTALE); 963 } 964 nmp = VFSTONFS(vp->v_mount); 965 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 966 rep->r_nmp = nmp; 967 rep->r_vp = vp; 968 rep->r_td = td; 969 rep->r_procnum = procnum; 970 rep->r_mreq = NULL; 971 i = 0; 972 m = mrest; 973 while (m) { 974 i += m->m_len; 975 m = m->m_next; 976 } 977 mrest_len = i; 978 979 /* 980 * Get the RPC header with authorization. 981 */ 982 kerbauth: 983 verf_str = auth_str = NULL; 984 if (nmp->nm_flag & NFSMNT_KERB) { 985 verf_str = nickv; 986 verf_len = sizeof (nickv); 987 auth_type = RPCAUTH_KERB4; 988 bzero((caddr_t)key, sizeof (key)); 989 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 990 &auth_len, verf_str, verf_len)) { 991 error = nfs_getauth(nmp, rep, cred, &auth_str, 992 &auth_len, verf_str, &verf_len, key); 993 if (error) { 994 kfree((caddr_t)rep, M_NFSREQ); 995 m_freem(mrest); 996 return (error); 997 } 998 } 999 } else { 1000 auth_type = RPCAUTH_UNIX; 1001 if (cred->cr_ngroups < 1) 1002 panic("nfsreq nogrps"); 1003 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 1004 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 1005 5 * NFSX_UNSIGNED; 1006 } 1007 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1008 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1009 if (auth_str) 1010 kfree(auth_str, M_TEMP); 1011 1012 /* 1013 * For stream protocols, insert a Sun RPC Record Mark. 1014 */ 1015 if (nmp->nm_sotype == SOCK_STREAM) { 1016 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT); 1017 if (m == NULL) { 1018 kfree(rep, M_NFSREQ); 1019 return (ENOBUFS); 1020 } 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 | R_MASKTIMER; 1034 else 1035 rep->r_flags = R_MASKTIMER; 1036 rep->r_mrep = NULL; 1037 1038 /* 1039 * Do the client side RPC. 1040 */ 1041 nfsstats.rpcrequests++; 1042 1043 /* 1044 * Chain request into list of outstanding requests. Be sure 1045 * to put it LAST so timer finds oldest requests first. Note 1046 * that R_MASKTIMER is set at the moment to prevent any timer 1047 * action on this request while we are still doing processing on 1048 * it below. splsoftclock() primarily protects nm_sent. Note 1049 * that we may block in this code so there is no atomicy guarentee. 1050 */ 1051 crit_enter(); 1052 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1053 1054 /* 1055 * If backing off another request or avoiding congestion, don't 1056 * send this one now but let timer do it. If not timing a request, 1057 * do it now. 1058 * 1059 * Even though the timer will not mess with our request there is 1060 * still the possibility that we will race a reply (which clears 1061 * R_SENT), especially on localhost connections, so be very careful 1062 * when setting R_SENT. We could set R_SENT prior to calling 1063 * nfs_send() but why bother if the response occurs that quickly? 1064 */ 1065 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1066 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1067 nmp->nm_sent < nmp->nm_cwnd)) { 1068 if (nmp->nm_soflags & PR_CONNREQUIRED) 1069 error = nfs_sndlock(rep); 1070 if (!error) { 1071 m2 = m_copym(m, 0, M_COPYALL, MB_WAIT); 1072 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); 1073 if (nmp->nm_soflags & PR_CONNREQUIRED) 1074 nfs_sndunlock(rep); 1075 } 1076 if (!error && (rep->r_flags & R_MUSTRESEND) == 0 && 1077 rep->r_mrep == NULL) { 1078 KASSERT((rep->r_flags & R_SENT) == 0, 1079 ("R_SENT ASSERT %p", rep)); 1080 nmp->nm_sent += NFS_CWNDSCALE; 1081 rep->r_flags |= R_SENT; 1082 } 1083 } else { 1084 rep->r_rtt = -1; 1085 } 1086 1087 /* 1088 * Let the timer do what it will with the request, then 1089 * wait for the reply from our send or the timer's. 1090 */ 1091 if (!error || error == EPIPE) { 1092 rep->r_flags &= ~R_MASKTIMER; 1093 crit_exit(); 1094 error = nfs_reply(rep); 1095 crit_enter(); 1096 } 1097 1098 /* 1099 * RPC done, unlink the request, but don't rip it out from under 1100 * the callout timer. 1101 */ 1102 while (rep->r_flags & R_LOCKED) { 1103 nfs_timer_raced = 1; 1104 tsleep(&nfs_timer_raced, 0, "nfstrac", 0); 1105 } 1106 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1107 1108 /* 1109 * Decrement the outstanding request count. 1110 */ 1111 if (rep->r_flags & R_SENT) { 1112 rep->r_flags &= ~R_SENT; 1113 nmp->nm_sent -= NFS_CWNDSCALE; 1114 } 1115 crit_exit(); 1116 1117 /* 1118 * If there was a successful reply and a tprintf msg. 1119 * tprintf a response. 1120 */ 1121 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1122 nfs_msg(rep->r_td, nmp->nm_mountp->mnt_stat.f_mntfromname, 1123 "is alive again"); 1124 mrep = rep->r_mrep; 1125 md = rep->r_md; 1126 dpos = rep->r_dpos; 1127 if (error) { 1128 m_freem(rep->r_mreq); 1129 kfree((caddr_t)rep, M_NFSREQ); 1130 return (error); 1131 } 1132 1133 /* 1134 * break down the rpc header and check if ok 1135 */ 1136 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1137 if (*tl++ == rpc_msgdenied) { 1138 if (*tl == rpc_mismatch) 1139 error = EOPNOTSUPP; 1140 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1141 if (!failed_auth) { 1142 failed_auth++; 1143 mheadend->m_next = NULL; 1144 m_freem(mrep); 1145 m_freem(rep->r_mreq); 1146 goto kerbauth; 1147 } else 1148 error = EAUTH; 1149 } else 1150 error = EACCES; 1151 m_freem(mrep); 1152 m_freem(rep->r_mreq); 1153 kfree((caddr_t)rep, M_NFSREQ); 1154 return (error); 1155 } 1156 1157 /* 1158 * Grab any Kerberos verifier, otherwise just throw it away. 1159 */ 1160 verf_type = fxdr_unsigned(int, *tl++); 1161 i = fxdr_unsigned(int32_t, *tl); 1162 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1163 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1164 if (error) 1165 goto nfsmout; 1166 } else if (i > 0) 1167 nfsm_adv(nfsm_rndup(i)); 1168 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1169 /* 0 == ok */ 1170 if (*tl == 0) { 1171 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1172 if (*tl != 0) { 1173 error = fxdr_unsigned(int, *tl); 1174 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1175 error == NFSERR_TRYLATER) { 1176 m_freem(mrep); 1177 error = 0; 1178 waituntil = time_second + trylater_delay; 1179 while (time_second < waituntil) 1180 (void) tsleep((caddr_t)&lbolt, 1181 0, "nqnfstry", 0); 1182 trylater_delay *= nfs_backoff[trylater_cnt]; 1183 if (trylater_cnt < 7) 1184 trylater_cnt++; 1185 goto tryagain; 1186 } 1187 1188 /* 1189 * If the File Handle was stale, invalidate the 1190 * lookup cache, just in case. 1191 * 1192 * To avoid namecache<->vnode deadlocks we must 1193 * release the vnode lock if we hold it. 1194 */ 1195 if (error == ESTALE) { 1196 int ltype; 1197 1198 ltype = lockstatus(&vp->v_lock, curthread); 1199 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1200 lockmgr(&vp->v_lock, LK_RELEASE); 1201 cache_inval_vp(vp, CINV_CHILDREN); 1202 if (ltype == LK_EXCLUSIVE || ltype == LK_SHARED) 1203 lockmgr(&vp->v_lock, ltype); 1204 } 1205 if (nmp->nm_flag & NFSMNT_NFSV3) { 1206 *mrp = mrep; 1207 *mdp = md; 1208 *dposp = dpos; 1209 error |= NFSERR_RETERR; 1210 } else 1211 m_freem(mrep); 1212 m_freem(rep->r_mreq); 1213 kfree((caddr_t)rep, M_NFSREQ); 1214 return (error); 1215 } 1216 1217 *mrp = mrep; 1218 *mdp = md; 1219 *dposp = dpos; 1220 m_freem(rep->r_mreq); 1221 FREE((caddr_t)rep, M_NFSREQ); 1222 return (0); 1223 } 1224 m_freem(mrep); 1225 error = EPROTONOSUPPORT; 1226 nfsmout: 1227 m_freem(rep->r_mreq); 1228 kfree((caddr_t)rep, M_NFSREQ); 1229 return (error); 1230 } 1231 1232 #ifndef NFS_NOSERVER 1233 /* 1234 * Generate the rpc reply header 1235 * siz arg. is used to decide if adding a cluster is worthwhile 1236 */ 1237 int 1238 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, 1239 int err, struct mbuf **mrq, struct mbuf **mbp, caddr_t *bposp) 1240 { 1241 u_int32_t *tl; 1242 struct mbuf *mreq; 1243 caddr_t bpos; 1244 struct mbuf *mb, *mb2; 1245 1246 siz += RPC_REPLYSIZ; 1247 mb = mreq = m_getl(max_hdr + siz, MB_WAIT, MT_DATA, M_PKTHDR, NULL); 1248 mreq->m_pkthdr.len = 0; 1249 /* 1250 * If this is not a cluster, try and leave leading space 1251 * for the lower level headers. 1252 */ 1253 if ((max_hdr + siz) < MINCLSIZE) 1254 mreq->m_data += max_hdr; 1255 tl = mtod(mreq, u_int32_t *); 1256 mreq->m_len = 6 * NFSX_UNSIGNED; 1257 bpos = ((caddr_t)tl) + mreq->m_len; 1258 *tl++ = txdr_unsigned(nd->nd_retxid); 1259 *tl++ = rpc_reply; 1260 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1261 *tl++ = rpc_msgdenied; 1262 if (err & NFSERR_AUTHERR) { 1263 *tl++ = rpc_autherr; 1264 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1265 mreq->m_len -= NFSX_UNSIGNED; 1266 bpos -= NFSX_UNSIGNED; 1267 } else { 1268 *tl++ = rpc_mismatch; 1269 *tl++ = txdr_unsigned(RPC_VER2); 1270 *tl = txdr_unsigned(RPC_VER2); 1271 } 1272 } else { 1273 *tl++ = rpc_msgaccepted; 1274 1275 /* 1276 * For Kerberos authentication, we must send the nickname 1277 * verifier back, otherwise just RPCAUTH_NULL. 1278 */ 1279 if (nd->nd_flag & ND_KERBFULL) { 1280 struct nfsuid *nuidp; 1281 struct timeval ktvin, ktvout; 1282 1283 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1284 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1285 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1286 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1287 &nuidp->nu_haddr, nd->nd_nam2))) 1288 break; 1289 } 1290 if (nuidp) { 1291 ktvin.tv_sec = 1292 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1293 ktvin.tv_usec = 1294 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1295 1296 /* 1297 * Encrypt the timestamp in ecb mode using the 1298 * session key. 1299 */ 1300 #ifdef NFSKERB 1301 XXX 1302 #endif 1303 1304 *tl++ = rpc_auth_kerb; 1305 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1306 *tl = ktvout.tv_sec; 1307 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1308 *tl++ = ktvout.tv_usec; 1309 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1310 } else { 1311 *tl++ = 0; 1312 *tl++ = 0; 1313 } 1314 } else { 1315 *tl++ = 0; 1316 *tl++ = 0; 1317 } 1318 switch (err) { 1319 case EPROGUNAVAIL: 1320 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1321 break; 1322 case EPROGMISMATCH: 1323 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1324 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1325 *tl++ = txdr_unsigned(2); 1326 *tl = txdr_unsigned(3); 1327 break; 1328 case EPROCUNAVAIL: 1329 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1330 break; 1331 case EBADRPC: 1332 *tl = txdr_unsigned(RPC_GARBAGE); 1333 break; 1334 default: 1335 *tl = 0; 1336 if (err != NFSERR_RETVOID) { 1337 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1338 if (err) 1339 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1340 else 1341 *tl = 0; 1342 } 1343 break; 1344 }; 1345 } 1346 1347 if (mrq != NULL) 1348 *mrq = mreq; 1349 *mbp = mb; 1350 *bposp = bpos; 1351 if (err != 0 && err != NFSERR_RETVOID) 1352 nfsstats.srvrpc_errs++; 1353 return (0); 1354 } 1355 1356 1357 #endif /* NFS_NOSERVER */ 1358 /* 1359 * Nfs timer routine 1360 * Scan the nfsreq list and retranmit any requests that have timed out 1361 * To avoid retransmission attempts on STREAM sockets (in the future) make 1362 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1363 */ 1364 void 1365 nfs_timer(void *arg /* never used */) 1366 { 1367 struct nfsreq *rep; 1368 struct mbuf *m; 1369 struct socket *so; 1370 struct nfsmount *nmp; 1371 int timeo; 1372 int error; 1373 #ifndef NFS_NOSERVER 1374 struct nfssvc_sock *slp; 1375 u_quad_t cur_usec; 1376 #endif /* NFS_NOSERVER */ 1377 struct thread *td = &thread0; /* XXX for credentials, will break if sleep */ 1378 1379 crit_enter(); 1380 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1381 nmp = rep->r_nmp; 1382 if (rep->r_mrep || (rep->r_flags & (R_SOFTTERM|R_MASKTIMER))) 1383 continue; 1384 rep->r_flags |= R_LOCKED; 1385 if (nfs_sigintr(nmp, rep, rep->r_td)) { 1386 nfs_softterm(rep); 1387 goto skip; 1388 } 1389 if (rep->r_rtt >= 0) { 1390 rep->r_rtt++; 1391 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1392 timeo = nmp->nm_timeo; 1393 else 1394 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1395 if (nmp->nm_timeouts > 0) 1396 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1397 if (rep->r_rtt <= timeo) 1398 goto skip; 1399 if (nmp->nm_timeouts < 8) 1400 nmp->nm_timeouts++; 1401 } 1402 /* 1403 * Check for server not responding 1404 */ 1405 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1406 rep->r_rexmit > nmp->nm_deadthresh) { 1407 nfs_msg(rep->r_td, 1408 nmp->nm_mountp->mnt_stat.f_mntfromname, 1409 "not responding"); 1410 rep->r_flags |= R_TPRINTFMSG; 1411 } 1412 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1413 nfsstats.rpctimeouts++; 1414 nfs_softterm(rep); 1415 goto skip; 1416 } 1417 if (nmp->nm_sotype != SOCK_DGRAM) { 1418 if (++rep->r_rexmit > NFS_MAXREXMIT) 1419 rep->r_rexmit = NFS_MAXREXMIT; 1420 goto skip; 1421 } 1422 if ((so = nmp->nm_so) == NULL) 1423 goto skip; 1424 1425 /* 1426 * If there is enough space and the window allows.. 1427 * Resend it 1428 * Set r_rtt to -1 in case we fail to send it now. 1429 */ 1430 rep->r_rtt = -1; 1431 if (ssb_space(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1432 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1433 (rep->r_flags & R_SENT) || 1434 nmp->nm_sent < nmp->nm_cwnd) && 1435 (m = m_copym(rep->r_mreq, 0, M_COPYALL, MB_DONTWAIT))){ 1436 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1437 error = so_pru_send(so, 0, m, NULL, NULL, td); 1438 else 1439 error = so_pru_send(so, 0, m, nmp->nm_nam, 1440 NULL, td); 1441 if (error) { 1442 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1443 so->so_error = 0; 1444 } else if (rep->r_mrep == NULL) { 1445 /* 1446 * Iff first send, start timing 1447 * else turn timing off, backoff timer 1448 * and divide congestion window by 2. 1449 * 1450 * It is possible for the so_pru_send() to 1451 * block and for us to race a reply so we 1452 * only do this if the reply field has not 1453 * been filled in. R_LOCKED will prevent 1454 * the request from being ripped out from under 1455 * us entirely. 1456 */ 1457 if (rep->r_flags & R_SENT) { 1458 rep->r_flags &= ~R_TIMING; 1459 if (++rep->r_rexmit > NFS_MAXREXMIT) 1460 rep->r_rexmit = NFS_MAXREXMIT; 1461 nmp->nm_cwnd >>= 1; 1462 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1463 nmp->nm_cwnd = NFS_CWNDSCALE; 1464 nfsstats.rpcretries++; 1465 } else { 1466 rep->r_flags |= R_SENT; 1467 nmp->nm_sent += NFS_CWNDSCALE; 1468 } 1469 rep->r_rtt = 0; 1470 } 1471 } 1472 skip: 1473 rep->r_flags &= ~R_LOCKED; 1474 } 1475 #ifndef NFS_NOSERVER 1476 1477 /* 1478 * Scan the write gathering queues for writes that need to be 1479 * completed now. 1480 */ 1481 cur_usec = nfs_curusec(); 1482 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1483 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) 1484 nfsrv_wakenfsd(slp, 1); 1485 } 1486 #endif /* NFS_NOSERVER */ 1487 1488 /* 1489 * Due to possible blocking, a client operation may be waiting for 1490 * us to finish processing this request so it can remove it. 1491 */ 1492 if (nfs_timer_raced) { 1493 nfs_timer_raced = 0; 1494 wakeup(&nfs_timer_raced); 1495 } 1496 crit_exit(); 1497 callout_reset(&nfs_timer_handle, nfs_ticks, nfs_timer, NULL); 1498 } 1499 1500 /* 1501 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1502 * wait for all requests to complete. This is used by forced unmounts 1503 * to terminate any outstanding RPCs. 1504 */ 1505 int 1506 nfs_nmcancelreqs(struct nfsmount *nmp) 1507 { 1508 struct nfsreq *req; 1509 int i; 1510 1511 crit_enter(); 1512 TAILQ_FOREACH(req, &nfs_reqq, r_chain) { 1513 if (nmp != req->r_nmp || req->r_mrep != NULL || 1514 (req->r_flags & R_SOFTTERM)) { 1515 continue; 1516 } 1517 nfs_softterm(req); 1518 } 1519 crit_exit(); 1520 1521 for (i = 0; i < 30; i++) { 1522 crit_enter(); 1523 TAILQ_FOREACH(req, &nfs_reqq, r_chain) { 1524 if (nmp == req->r_nmp) 1525 break; 1526 } 1527 crit_exit(); 1528 if (req == NULL) 1529 return (0); 1530 tsleep(&lbolt, 0, "nfscancel", 0); 1531 } 1532 return (EBUSY); 1533 } 1534 1535 /* 1536 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT). 1537 * The nm_send count is decremented now to avoid deadlocks when the process in 1538 * soreceive() hasn't yet managed to send its own request. 1539 * 1540 * This routine must be called at splsoftclock() to protect r_flags and 1541 * nm_sent. 1542 */ 1543 1544 static void 1545 nfs_softterm(struct nfsreq *rep) 1546 { 1547 rep->r_flags |= R_SOFTTERM; 1548 1549 if (rep->r_flags & R_SENT) { 1550 rep->r_nmp->nm_sent -= NFS_CWNDSCALE; 1551 rep->r_flags &= ~R_SENT; 1552 } 1553 } 1554 1555 /* 1556 * Test for a termination condition pending on the process. 1557 * This is used for NFSMNT_INT mounts. 1558 */ 1559 int 1560 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct thread *td) 1561 { 1562 sigset_t tmpset; 1563 struct proc *p; 1564 struct lwp *lp; 1565 1566 if (rep && (rep->r_flags & R_SOFTTERM)) 1567 return (EINTR); 1568 /* Terminate all requests while attempting a forced unmount. */ 1569 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) 1570 return (EINTR); 1571 if (!(nmp->nm_flag & NFSMNT_INT)) 1572 return (0); 1573 /* td might be NULL YYY */ 1574 if (td == NULL || (p = td->td_proc) == NULL) 1575 return (0); 1576 1577 lp = td->td_lwp; 1578 tmpset = lwp_sigpend(lp); 1579 SIGSETNAND(tmpset, lp->lwp_sigmask); 1580 SIGSETNAND(tmpset, p->p_sigignore); 1581 if (SIGNOTEMPTY(tmpset) && NFSINT_SIGMASK(tmpset)) 1582 return (EINTR); 1583 1584 return (0); 1585 } 1586 1587 /* 1588 * Lock a socket against others. 1589 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1590 * and also to avoid race conditions between the processes with nfs requests 1591 * in progress when a reconnect is necessary. 1592 */ 1593 int 1594 nfs_sndlock(struct nfsreq *rep) 1595 { 1596 int *statep = &rep->r_nmp->nm_state; 1597 struct thread *td; 1598 int slptimeo; 1599 int slpflag; 1600 int error; 1601 1602 slpflag = 0; 1603 slptimeo = 0; 1604 td = rep->r_td; 1605 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1606 slpflag = PCATCH; 1607 1608 error = 0; 1609 crit_enter(); 1610 while (*statep & NFSSTA_SNDLOCK) { 1611 *statep |= NFSSTA_WANTSND; 1612 if (nfs_sigintr(rep->r_nmp, rep, td)) { 1613 error = EINTR; 1614 break; 1615 } 1616 tsleep((caddr_t)statep, slpflag, "nfsndlck", slptimeo); 1617 if (slpflag == PCATCH) { 1618 slpflag = 0; 1619 slptimeo = 2 * hz; 1620 } 1621 } 1622 /* Always fail if our request has been cancelled. */ 1623 if ((rep->r_flags & R_SOFTTERM)) 1624 error = EINTR; 1625 if (error == 0) 1626 *statep |= NFSSTA_SNDLOCK; 1627 crit_exit(); 1628 return (error); 1629 } 1630 1631 /* 1632 * Unlock the stream socket for others. 1633 */ 1634 void 1635 nfs_sndunlock(struct nfsreq *rep) 1636 { 1637 int *statep = &rep->r_nmp->nm_state; 1638 1639 if ((*statep & NFSSTA_SNDLOCK) == 0) 1640 panic("nfs sndunlock"); 1641 crit_enter(); 1642 *statep &= ~NFSSTA_SNDLOCK; 1643 if (*statep & NFSSTA_WANTSND) { 1644 *statep &= ~NFSSTA_WANTSND; 1645 wakeup((caddr_t)statep); 1646 } 1647 crit_exit(); 1648 } 1649 1650 static int 1651 nfs_rcvlock(struct nfsreq *rep) 1652 { 1653 int *statep = &rep->r_nmp->nm_state; 1654 int slpflag; 1655 int slptimeo; 1656 int error; 1657 1658 /* 1659 * Unconditionally check for completion in case another nfsiod 1660 * get the packet while the caller was blocked, before the caller 1661 * called us. Packet reception is handled by mainline code which 1662 * is protected by the BGL at the moment. 1663 * 1664 * We do not strictly need the second check just before the 1665 * tsleep(), but it's good defensive programming. 1666 */ 1667 if (rep->r_mrep != NULL) 1668 return (EALREADY); 1669 1670 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1671 slpflag = PCATCH; 1672 else 1673 slpflag = 0; 1674 slptimeo = 0; 1675 error = 0; 1676 crit_enter(); 1677 while (*statep & NFSSTA_RCVLOCK) { 1678 if (nfs_sigintr(rep->r_nmp, rep, rep->r_td)) { 1679 error = EINTR; 1680 break; 1681 } 1682 if (rep->r_mrep != NULL) { 1683 error = EALREADY; 1684 break; 1685 } 1686 *statep |= NFSSTA_WANTRCV; 1687 tsleep((caddr_t)statep, slpflag, "nfsrcvlk", slptimeo); 1688 /* 1689 * If our reply was recieved while we were sleeping, 1690 * then just return without taking the lock to avoid a 1691 * situation where a single iod could 'capture' the 1692 * recieve lock. 1693 */ 1694 if (rep->r_mrep != NULL) { 1695 error = EALREADY; 1696 break; 1697 } 1698 if (slpflag == PCATCH) { 1699 slpflag = 0; 1700 slptimeo = 2 * hz; 1701 } 1702 } 1703 if (error == 0) { 1704 *statep |= NFSSTA_RCVLOCK; 1705 rep->r_nmp->nm_rcvlock_td = curthread; /* DEBUGGING */ 1706 } 1707 crit_exit(); 1708 return (error); 1709 } 1710 1711 /* 1712 * Unlock the stream socket for others. 1713 */ 1714 static void 1715 nfs_rcvunlock(struct nfsreq *rep) 1716 { 1717 int *statep = &rep->r_nmp->nm_state; 1718 1719 if ((*statep & NFSSTA_RCVLOCK) == 0) 1720 panic("nfs rcvunlock"); 1721 crit_enter(); 1722 rep->r_nmp->nm_rcvlock_td = (void *)-1; /* DEBUGGING */ 1723 *statep &= ~NFSSTA_RCVLOCK; 1724 if (*statep & NFSSTA_WANTRCV) { 1725 *statep &= ~NFSSTA_WANTRCV; 1726 wakeup((caddr_t)statep); 1727 } 1728 crit_exit(); 1729 } 1730 1731 /* 1732 * nfs_realign: 1733 * 1734 * Check for badly aligned mbuf data and realign by copying the unaligned 1735 * portion of the data into a new mbuf chain and freeing the portions 1736 * of the old chain that were replaced. 1737 * 1738 * We cannot simply realign the data within the existing mbuf chain 1739 * because the underlying buffers may contain other rpc commands and 1740 * we cannot afford to overwrite them. 1741 * 1742 * We would prefer to avoid this situation entirely. The situation does 1743 * not occur with NFS/UDP and is supposed to only occassionally occur 1744 * with TCP. Use vfs.nfs.realign_count and realign_test to check this. 1745 */ 1746 static void 1747 nfs_realign(struct mbuf **pm, int hsiz) 1748 { 1749 struct mbuf *m; 1750 struct mbuf *n = NULL; 1751 int off = 0; 1752 1753 ++nfs_realign_test; 1754 1755 while ((m = *pm) != NULL) { 1756 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) { 1757 n = m_getl(m->m_len, MB_WAIT, MT_DATA, 0, NULL); 1758 n->m_len = 0; 1759 break; 1760 } 1761 pm = &m->m_next; 1762 } 1763 1764 /* 1765 * If n is non-NULL, loop on m copying data, then replace the 1766 * portion of the chain that had to be realigned. 1767 */ 1768 if (n != NULL) { 1769 ++nfs_realign_count; 1770 while (m) { 1771 m_copyback(n, off, m->m_len, mtod(m, caddr_t)); 1772 off += m->m_len; 1773 m = m->m_next; 1774 } 1775 m_freem(*pm); 1776 *pm = n; 1777 } 1778 } 1779 1780 #ifndef NFS_NOSERVER 1781 1782 /* 1783 * Parse an RPC request 1784 * - verify it 1785 * - fill in the cred struct. 1786 */ 1787 int 1788 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 1789 { 1790 int len, i; 1791 u_int32_t *tl; 1792 int32_t t1; 1793 struct uio uio; 1794 struct iovec iov; 1795 caddr_t dpos, cp2, cp; 1796 u_int32_t nfsvers, auth_type; 1797 uid_t nickuid; 1798 int error = 0, ticklen; 1799 struct mbuf *mrep, *md; 1800 struct nfsuid *nuidp; 1801 struct timeval tvin, tvout; 1802 #if 0 /* until encrypted keys are implemented */ 1803 NFSKERBKEYSCHED_T keys; /* stores key schedule */ 1804 #endif 1805 1806 mrep = nd->nd_mrep; 1807 md = nd->nd_md; 1808 dpos = nd->nd_dpos; 1809 if (has_header) { 1810 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1811 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1812 if (*tl++ != rpc_call) { 1813 m_freem(mrep); 1814 return (EBADRPC); 1815 } 1816 } else 1817 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1818 nd->nd_repstat = 0; 1819 nd->nd_flag = 0; 1820 if (*tl++ != rpc_vers) { 1821 nd->nd_repstat = ERPCMISMATCH; 1822 nd->nd_procnum = NFSPROC_NOOP; 1823 return (0); 1824 } 1825 if (*tl != nfs_prog) { 1826 nd->nd_repstat = EPROGUNAVAIL; 1827 nd->nd_procnum = NFSPROC_NOOP; 1828 return (0); 1829 } 1830 tl++; 1831 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1832 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 1833 nd->nd_repstat = EPROGMISMATCH; 1834 nd->nd_procnum = NFSPROC_NOOP; 1835 return (0); 1836 } 1837 if (nfsvers == NFS_VER3) 1838 nd->nd_flag = ND_NFSV3; 1839 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1840 if (nd->nd_procnum == NFSPROC_NULL) 1841 return (0); 1842 if (nd->nd_procnum >= NFS_NPROCS || 1843 (nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1844 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1845 nd->nd_repstat = EPROCUNAVAIL; 1846 nd->nd_procnum = NFSPROC_NOOP; 1847 return (0); 1848 } 1849 if ((nd->nd_flag & ND_NFSV3) == 0) 1850 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1851 auth_type = *tl++; 1852 len = fxdr_unsigned(int, *tl++); 1853 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1854 m_freem(mrep); 1855 return (EBADRPC); 1856 } 1857 1858 nd->nd_flag &= ~ND_KERBAUTH; 1859 /* 1860 * Handle auth_unix or auth_kerb. 1861 */ 1862 if (auth_type == rpc_auth_unix) { 1863 len = fxdr_unsigned(int, *++tl); 1864 if (len < 0 || len > NFS_MAXNAMLEN) { 1865 m_freem(mrep); 1866 return (EBADRPC); 1867 } 1868 nfsm_adv(nfsm_rndup(len)); 1869 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1870 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 1871 nd->nd_cr.cr_ref = 1; 1872 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1873 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1874 len = fxdr_unsigned(int, *tl); 1875 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1876 m_freem(mrep); 1877 return (EBADRPC); 1878 } 1879 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1880 for (i = 1; i <= len; i++) 1881 if (i < NGROUPS) 1882 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1883 else 1884 tl++; 1885 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 1886 if (nd->nd_cr.cr_ngroups > 1) 1887 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1888 len = fxdr_unsigned(int, *++tl); 1889 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1890 m_freem(mrep); 1891 return (EBADRPC); 1892 } 1893 if (len > 0) 1894 nfsm_adv(nfsm_rndup(len)); 1895 } else if (auth_type == rpc_auth_kerb) { 1896 switch (fxdr_unsigned(int, *tl++)) { 1897 case RPCAKN_FULLNAME: 1898 ticklen = fxdr_unsigned(int, *tl); 1899 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1900 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1901 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1902 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1903 m_freem(mrep); 1904 return (EBADRPC); 1905 } 1906 uio.uio_offset = 0; 1907 uio.uio_iov = &iov; 1908 uio.uio_iovcnt = 1; 1909 uio.uio_segflg = UIO_SYSSPACE; 1910 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1911 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1912 nfsm_mtouio(&uio, uio.uio_resid); 1913 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1914 if (*tl++ != rpc_auth_kerb || 1915 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1916 kprintf("Bad kerb verifier\n"); 1917 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1918 nd->nd_procnum = NFSPROC_NOOP; 1919 return (0); 1920 } 1921 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1922 tl = (u_int32_t *)cp; 1923 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1924 kprintf("Not fullname kerb verifier\n"); 1925 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1926 nd->nd_procnum = NFSPROC_NOOP; 1927 return (0); 1928 } 1929 cp += NFSX_UNSIGNED; 1930 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 1931 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1932 nd->nd_flag |= ND_KERBFULL; 1933 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1934 break; 1935 case RPCAKN_NICKNAME: 1936 if (len != 2 * NFSX_UNSIGNED) { 1937 kprintf("Kerb nickname short\n"); 1938 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1939 nd->nd_procnum = NFSPROC_NOOP; 1940 return (0); 1941 } 1942 nickuid = fxdr_unsigned(uid_t, *tl); 1943 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1944 if (*tl++ != rpc_auth_kerb || 1945 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1946 kprintf("Kerb nick verifier bad\n"); 1947 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1948 nd->nd_procnum = NFSPROC_NOOP; 1949 return (0); 1950 } 1951 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1952 tvin.tv_sec = *tl++; 1953 tvin.tv_usec = *tl; 1954 1955 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 1956 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1957 if (nuidp->nu_cr.cr_uid == nickuid && 1958 (!nd->nd_nam2 || 1959 netaddr_match(NU_NETFAM(nuidp), 1960 &nuidp->nu_haddr, nd->nd_nam2))) 1961 break; 1962 } 1963 if (!nuidp) { 1964 nd->nd_repstat = 1965 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1966 nd->nd_procnum = NFSPROC_NOOP; 1967 return (0); 1968 } 1969 1970 /* 1971 * Now, decrypt the timestamp using the session key 1972 * and validate it. 1973 */ 1974 #ifdef NFSKERB 1975 XXX 1976 #endif 1977 1978 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1979 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1980 if (nuidp->nu_expire < time_second || 1981 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1982 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1983 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1984 nuidp->nu_expire = 0; 1985 nd->nd_repstat = 1986 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1987 nd->nd_procnum = NFSPROC_NOOP; 1988 return (0); 1989 } 1990 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1991 nd->nd_flag |= ND_KERBNICK; 1992 }; 1993 } else { 1994 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1995 nd->nd_procnum = NFSPROC_NOOP; 1996 return (0); 1997 } 1998 1999 nd->nd_md = md; 2000 nd->nd_dpos = dpos; 2001 return (0); 2002 nfsmout: 2003 return (error); 2004 } 2005 2006 #endif 2007 2008 /* 2009 * Send a message to the originating process's terminal. The thread and/or 2010 * process may be NULL. YYY the thread should not be NULL but there may 2011 * still be some uio_td's that are still being passed as NULL through to 2012 * nfsm_request(). 2013 */ 2014 static int 2015 nfs_msg(struct thread *td, char *server, char *msg) 2016 { 2017 tpr_t tpr; 2018 2019 if (td && td->td_proc) 2020 tpr = tprintf_open(td->td_proc); 2021 else 2022 tpr = NULL; 2023 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2024 tprintf_close(tpr); 2025 return (0); 2026 } 2027 2028 #ifndef NFS_NOSERVER 2029 /* 2030 * Socket upcall routine for the nfsd sockets. 2031 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2032 * Essentially do as much as possible non-blocking, else punt and it will 2033 * be called with MB_WAIT from an nfsd. 2034 */ 2035 void 2036 nfsrv_rcv(struct socket *so, void *arg, int waitflag) 2037 { 2038 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2039 struct mbuf *m; 2040 struct sockaddr *nam; 2041 struct sockbuf sio; 2042 int flags, error; 2043 int nparallel_wakeup = 0; 2044 2045 if ((slp->ns_flag & SLP_VALID) == 0) 2046 return; 2047 2048 /* 2049 * Do not allow an infinite number of completed RPC records to build 2050 * up before we stop reading data from the socket. Otherwise we could 2051 * end up holding onto an unreasonable number of mbufs for requests 2052 * waiting for service. 2053 * 2054 * This should give pretty good feedback to the TCP 2055 * layer and prevents a memory crunch for other protocols. 2056 * 2057 * Note that the same service socket can be dispatched to several 2058 * nfs servers simultaniously. 2059 * 2060 * the tcp protocol callback calls us with MB_DONTWAIT. 2061 * nfsd calls us with MB_WAIT (typically). 2062 */ 2063 if (waitflag == MB_DONTWAIT && slp->ns_numrec >= nfsd_waiting / 2 + 1) { 2064 slp->ns_flag |= SLP_NEEDQ; 2065 goto dorecs; 2066 } 2067 2068 /* 2069 * Handle protocol specifics to parse an RPC request. We always 2070 * pull from the socket using non-blocking I/O. 2071 */ 2072 if (so->so_type == SOCK_STREAM) { 2073 /* 2074 * The data has to be read in an orderly fashion from a TCP 2075 * stream, unlike a UDP socket. It is possible for soreceive 2076 * and/or nfsrv_getstream() to block, so make sure only one 2077 * entity is messing around with the TCP stream at any given 2078 * moment. The receive sockbuf's lock in soreceive is not 2079 * sufficient. 2080 * 2081 * Note that this procedure can be called from any number of 2082 * NFS severs *OR* can be upcalled directly from a TCP 2083 * protocol thread. 2084 */ 2085 if (slp->ns_flag & SLP_GETSTREAM) { 2086 slp->ns_flag |= SLP_NEEDQ; 2087 goto dorecs; 2088 } 2089 slp->ns_flag |= SLP_GETSTREAM; 2090 2091 /* 2092 * Do soreceive(). Pull out as much data as possible without 2093 * blocking. 2094 */ 2095 sbinit(&sio, 1000000000); 2096 flags = MSG_DONTWAIT; 2097 error = so_pru_soreceive(so, &nam, NULL, &sio, NULL, &flags); 2098 if (error || sio.sb_mb == NULL) { 2099 if (error == EWOULDBLOCK) 2100 slp->ns_flag |= SLP_NEEDQ; 2101 else 2102 slp->ns_flag |= SLP_DISCONN; 2103 slp->ns_flag &= ~SLP_GETSTREAM; 2104 goto dorecs; 2105 } 2106 m = sio.sb_mb; 2107 if (slp->ns_rawend) { 2108 slp->ns_rawend->m_next = m; 2109 slp->ns_cc += sio.sb_cc; 2110 } else { 2111 slp->ns_raw = m; 2112 slp->ns_cc = sio.sb_cc; 2113 } 2114 while (m->m_next) 2115 m = m->m_next; 2116 slp->ns_rawend = m; 2117 2118 /* 2119 * Now try and parse as many record(s) as we can out of the 2120 * raw stream data. 2121 */ 2122 error = nfsrv_getstream(slp, waitflag, &nparallel_wakeup); 2123 if (error) { 2124 if (error == EPERM) 2125 slp->ns_flag |= SLP_DISCONN; 2126 else 2127 slp->ns_flag |= SLP_NEEDQ; 2128 } 2129 slp->ns_flag &= ~SLP_GETSTREAM; 2130 } else { 2131 /* 2132 * For UDP soreceive typically pulls just one packet, loop 2133 * to get the whole batch. 2134 */ 2135 do { 2136 sbinit(&sio, 1000000000); 2137 flags = MSG_DONTWAIT; 2138 error = so_pru_soreceive(so, &nam, NULL, &sio, 2139 NULL, &flags); 2140 if (sio.sb_mb) { 2141 struct nfsrv_rec *rec; 2142 int mf = (waitflag & MB_DONTWAIT) ? 2143 M_NOWAIT : M_WAITOK; 2144 rec = kmalloc(sizeof(struct nfsrv_rec), 2145 M_NFSRVDESC, mf); 2146 if (!rec) { 2147 if (nam) 2148 FREE(nam, M_SONAME); 2149 m_freem(sio.sb_mb); 2150 continue; 2151 } 2152 nfs_realign(&sio.sb_mb, 10 * NFSX_UNSIGNED); 2153 rec->nr_address = nam; 2154 rec->nr_packet = sio.sb_mb; 2155 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2156 ++slp->ns_numrec; 2157 ++nparallel_wakeup; 2158 } 2159 if (error) { 2160 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2161 && error != EWOULDBLOCK) { 2162 slp->ns_flag |= SLP_DISCONN; 2163 goto dorecs; 2164 } 2165 } 2166 } while (sio.sb_mb); 2167 } 2168 2169 /* 2170 * If we were upcalled from the tcp protocol layer and we have 2171 * fully parsed records ready to go, or there is new data pending, 2172 * or something went wrong, try to wake up an nfsd thread to deal 2173 * with it. 2174 */ 2175 dorecs: 2176 if (waitflag == MB_DONTWAIT && (slp->ns_numrec > 0 2177 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) { 2178 nfsrv_wakenfsd(slp, nparallel_wakeup); 2179 } 2180 } 2181 2182 /* 2183 * Try and extract an RPC request from the mbuf data list received on a 2184 * stream socket. The "waitflag" argument indicates whether or not it 2185 * can sleep. 2186 */ 2187 static int 2188 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag, int *countp) 2189 { 2190 struct mbuf *m, **mpp; 2191 char *cp1, *cp2; 2192 int len; 2193 struct mbuf *om, *m2, *recm; 2194 u_int32_t recmark; 2195 2196 for (;;) { 2197 if (slp->ns_reclen == 0) { 2198 if (slp->ns_cc < NFSX_UNSIGNED) 2199 return (0); 2200 m = slp->ns_raw; 2201 if (m->m_len >= NFSX_UNSIGNED) { 2202 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 2203 m->m_data += NFSX_UNSIGNED; 2204 m->m_len -= NFSX_UNSIGNED; 2205 } else { 2206 cp1 = (caddr_t)&recmark; 2207 cp2 = mtod(m, caddr_t); 2208 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2209 while (m->m_len == 0) { 2210 m = m->m_next; 2211 cp2 = mtod(m, caddr_t); 2212 } 2213 *cp1++ = *cp2++; 2214 m->m_data++; 2215 m->m_len--; 2216 } 2217 } 2218 slp->ns_cc -= NFSX_UNSIGNED; 2219 recmark = ntohl(recmark); 2220 slp->ns_reclen = recmark & ~0x80000000; 2221 if (recmark & 0x80000000) 2222 slp->ns_flag |= SLP_LASTFRAG; 2223 else 2224 slp->ns_flag &= ~SLP_LASTFRAG; 2225 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) { 2226 log(LOG_ERR, "%s (%d) from nfs client\n", 2227 "impossible packet length", 2228 slp->ns_reclen); 2229 return (EPERM); 2230 } 2231 } 2232 2233 /* 2234 * Now get the record part. 2235 * 2236 * Note that slp->ns_reclen may be 0. Linux sometimes 2237 * generates 0-length RPCs 2238 */ 2239 recm = NULL; 2240 if (slp->ns_cc == slp->ns_reclen) { 2241 recm = slp->ns_raw; 2242 slp->ns_raw = slp->ns_rawend = NULL; 2243 slp->ns_cc = slp->ns_reclen = 0; 2244 } else if (slp->ns_cc > slp->ns_reclen) { 2245 len = 0; 2246 m = slp->ns_raw; 2247 om = NULL; 2248 2249 while (len < slp->ns_reclen) { 2250 if ((len + m->m_len) > slp->ns_reclen) { 2251 m2 = m_copym(m, 0, slp->ns_reclen - len, 2252 waitflag); 2253 if (m2) { 2254 if (om) { 2255 om->m_next = m2; 2256 recm = slp->ns_raw; 2257 } else 2258 recm = m2; 2259 m->m_data += slp->ns_reclen - len; 2260 m->m_len -= slp->ns_reclen - len; 2261 len = slp->ns_reclen; 2262 } else { 2263 return (EWOULDBLOCK); 2264 } 2265 } else if ((len + m->m_len) == slp->ns_reclen) { 2266 om = m; 2267 len += m->m_len; 2268 m = m->m_next; 2269 recm = slp->ns_raw; 2270 om->m_next = NULL; 2271 } else { 2272 om = m; 2273 len += m->m_len; 2274 m = m->m_next; 2275 } 2276 } 2277 slp->ns_raw = m; 2278 slp->ns_cc -= len; 2279 slp->ns_reclen = 0; 2280 } else { 2281 return (0); 2282 } 2283 2284 /* 2285 * Accumulate the fragments into a record. 2286 */ 2287 mpp = &slp->ns_frag; 2288 while (*mpp) 2289 mpp = &((*mpp)->m_next); 2290 *mpp = recm; 2291 if (slp->ns_flag & SLP_LASTFRAG) { 2292 struct nfsrv_rec *rec; 2293 int mf = (waitflag & MB_DONTWAIT) ? M_NOWAIT : M_WAITOK; 2294 rec = kmalloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, mf); 2295 if (!rec) { 2296 m_freem(slp->ns_frag); 2297 } else { 2298 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); 2299 rec->nr_address = NULL; 2300 rec->nr_packet = slp->ns_frag; 2301 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2302 ++slp->ns_numrec; 2303 ++*countp; 2304 } 2305 slp->ns_frag = NULL; 2306 } 2307 } 2308 } 2309 2310 /* 2311 * Parse an RPC header. 2312 */ 2313 int 2314 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, 2315 struct nfsrv_descript **ndp) 2316 { 2317 struct nfsrv_rec *rec; 2318 struct mbuf *m; 2319 struct sockaddr *nam; 2320 struct nfsrv_descript *nd; 2321 int error; 2322 2323 *ndp = NULL; 2324 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) 2325 return (ENOBUFS); 2326 rec = STAILQ_FIRST(&slp->ns_rec); 2327 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 2328 KKASSERT(slp->ns_numrec > 0); 2329 --slp->ns_numrec; 2330 nam = rec->nr_address; 2331 m = rec->nr_packet; 2332 kfree(rec, M_NFSRVDESC); 2333 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2334 M_NFSRVDESC, M_WAITOK); 2335 nd->nd_md = nd->nd_mrep = m; 2336 nd->nd_nam2 = nam; 2337 nd->nd_dpos = mtod(m, caddr_t); 2338 error = nfs_getreq(nd, nfsd, TRUE); 2339 if (error) { 2340 if (nam) { 2341 FREE(nam, M_SONAME); 2342 } 2343 kfree((caddr_t)nd, M_NFSRVDESC); 2344 return (error); 2345 } 2346 *ndp = nd; 2347 nfsd->nfsd_nd = nd; 2348 return (0); 2349 } 2350 2351 /* 2352 * Try to assign service sockets to nfsd threads based on the number 2353 * of new rpc requests that have been queued on the service socket. 2354 * 2355 * If no nfsd's are available or additonal requests are pending, set the 2356 * NFSD_CHECKSLP flag so that one of the running nfsds will go look for 2357 * the work in the nfssvc_sock list when it is finished processing its 2358 * current work. This flag is only cleared when an nfsd can not find 2359 * any new work to perform. 2360 */ 2361 void 2362 nfsrv_wakenfsd(struct nfssvc_sock *slp, int nparallel) 2363 { 2364 struct nfsd *nd; 2365 2366 if ((slp->ns_flag & SLP_VALID) == 0) 2367 return; 2368 if (nparallel <= 1) 2369 nparallel = 1; 2370 TAILQ_FOREACH(nd, &nfsd_head, nfsd_chain) { 2371 if (nd->nfsd_flag & NFSD_WAITING) { 2372 nd->nfsd_flag &= ~NFSD_WAITING; 2373 if (nd->nfsd_slp) 2374 panic("nfsd wakeup"); 2375 slp->ns_sref++; 2376 nd->nfsd_slp = slp; 2377 wakeup((caddr_t)nd); 2378 if (--nparallel == 0) 2379 break; 2380 } 2381 } 2382 if (nparallel) { 2383 slp->ns_flag |= SLP_DOREC; 2384 nfsd_head_flag |= NFSD_CHECKSLP; 2385 } 2386 } 2387 #endif /* NFS_NOSERVER */ 2388