nfs_socket.c revision 1.176
1 /* $NetBSD: nfs_socket.c,v 1.176 2009/01/18 09:45:05 mrg Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 35 */ 36 37 /* 38 * Socket operations for use by nfs 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_socket.c,v 1.176 2009/01/18 09:45:05 mrg Exp $"); 43 44 #ifdef _KERNEL_OPT 45 #include "fs_nfs.h" 46 #include "opt_nfs.h" 47 #include "opt_mbuftrace.h" 48 #endif 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/evcnt.h> 53 #include <sys/callout.h> 54 #include <sys/proc.h> 55 #include <sys/mount.h> 56 #include <sys/kernel.h> 57 #include <sys/kmem.h> 58 #include <sys/mbuf.h> 59 #include <sys/vnode.h> 60 #include <sys/domain.h> 61 #include <sys/protosw.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/syslog.h> 65 #include <sys/tprintf.h> 66 #include <sys/namei.h> 67 #include <sys/signal.h> 68 #include <sys/signalvar.h> 69 #include <sys/kauth.h> 70 71 #include <netinet/in.h> 72 #include <netinet/tcp.h> 73 74 #include <nfs/rpcv2.h> 75 #include <nfs/nfsproto.h> 76 #include <nfs/nfs.h> 77 #include <nfs/xdr_subs.h> 78 #include <nfs/nfsm_subs.h> 79 #include <nfs/nfsmount.h> 80 #include <nfs/nfsnode.h> 81 #include <nfs/nfsrtt.h> 82 #include <nfs/nfs_var.h> 83 84 #ifdef MBUFTRACE 85 struct mowner nfs_mowner = MOWNER_INIT("nfs",""); 86 #endif 87 88 /* 89 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 90 * Use the mean and mean deviation of rtt for the appropriate type of rpc 91 * for the frequent rpcs and a default for the others. 92 * The justification for doing "other" this way is that these rpcs 93 * happen so infrequently that timer est. would probably be stale. 94 * Also, since many of these rpcs are 95 * non-idempotent, a conservative timeout is desired. 96 * getattr, lookup - A+2D 97 * read, write - A+4D 98 * other - nm_timeo 99 */ 100 #define NFS_RTO(n, t) \ 101 ((t) == 0 ? (n)->nm_timeo : \ 102 ((t) < 3 ? \ 103 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 104 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 105 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 106 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 107 /* 108 * External data, mostly RPC constants in XDR form 109 */ 110 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 111 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 112 rpc_auth_kerb; 113 extern u_int32_t nfs_prog; 114 extern const int nfsv3_procid[NFS_NPROCS]; 115 extern int nfs_ticks; 116 117 #ifdef DEBUG 118 /* 119 * Avoid spamming the console with debugging messages. We only print 120 * the nfs timer and reply error debugs every 10 seconds. 121 */ 122 static const struct timeval nfs_err_interval = { 10, 0 }; 123 static struct timeval nfs_reply_last_err_time; 124 static struct timeval nfs_timer_last_err_time; 125 #endif 126 127 /* 128 * Defines which timer to use for the procnum. 129 * 0 - default 130 * 1 - getattr 131 * 2 - lookup 132 * 3 - read 133 * 4 - write 134 */ 135 static const int proct[NFS_NPROCS] = { 136 [NFSPROC_NULL] = 0, 137 [NFSPROC_GETATTR] = 1, 138 [NFSPROC_SETATTR] = 0, 139 [NFSPROC_LOOKUP] = 2, 140 [NFSPROC_ACCESS] = 1, 141 [NFSPROC_READLINK] = 3, 142 [NFSPROC_READ] = 3, 143 [NFSPROC_WRITE] = 4, 144 [NFSPROC_CREATE] = 0, 145 [NFSPROC_MKDIR] = 0, 146 [NFSPROC_SYMLINK] = 0, 147 [NFSPROC_MKNOD] = 0, 148 [NFSPROC_REMOVE] = 0, 149 [NFSPROC_RMDIR] = 0, 150 [NFSPROC_RENAME] = 0, 151 [NFSPROC_LINK] = 0, 152 [NFSPROC_READDIR] = 3, 153 [NFSPROC_READDIRPLUS] = 3, 154 [NFSPROC_FSSTAT] = 0, 155 [NFSPROC_FSINFO] = 0, 156 [NFSPROC_PATHCONF] = 0, 157 [NFSPROC_COMMIT] = 0, 158 [NFSPROC_NOOP] = 0, 159 }; 160 161 /* 162 * There is a congestion window for outstanding rpcs maintained per mount 163 * point. The cwnd size is adjusted in roughly the way that: 164 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 165 * SIGCOMM '88". ACM, August 1988. 166 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 167 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 168 * of rpcs is in progress. 169 * (The sent count and cwnd are scaled for integer arith.) 170 * Variants of "slow start" were tried and were found to be too much of a 171 * performance hit (ave. rtt 3 times larger), 172 * I suspect due to the large rtt that nfs rpcs have. 173 */ 174 #define NFS_CWNDSCALE 256 175 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 176 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 177 int nfsrtton = 0; 178 struct nfsrtt nfsrtt; 179 struct nfsreqhead nfs_reqq; 180 static callout_t nfs_timer_ch; 181 static struct evcnt nfs_timer_ev; 182 static struct evcnt nfs_timer_start_ev; 183 static struct evcnt nfs_timer_stop_ev; 184 static kmutex_t nfs_timer_lock; 185 static bool (*nfs_timer_srvvec)(void); 186 187 #ifdef NFS 188 static int nfs_sndlock(struct nfsmount *, struct nfsreq *); 189 static void nfs_sndunlock(struct nfsmount *); 190 #endif 191 static int nfs_rcvlock(struct nfsmount *, struct nfsreq *); 192 static void nfs_rcvunlock(struct nfsmount *); 193 194 /* 195 * Initialize sockets and congestion for a new NFS connection. 196 * We do not free the sockaddr if error. 197 */ 198 int 199 nfs_connect(nmp, rep, l) 200 struct nfsmount *nmp; 201 struct nfsreq *rep; 202 struct lwp *l; 203 { 204 struct socket *so; 205 int error, rcvreserve, sndreserve; 206 struct sockaddr *saddr; 207 struct sockaddr_in *sin; 208 struct sockaddr_in6 *sin6; 209 struct mbuf *m; 210 int val; 211 212 nmp->nm_so = (struct socket *)0; 213 saddr = mtod(nmp->nm_nam, struct sockaddr *); 214 error = socreate(saddr->sa_family, &nmp->nm_so, 215 nmp->nm_sotype, nmp->nm_soproto, l, NULL); 216 if (error) 217 goto bad; 218 so = nmp->nm_so; 219 #ifdef MBUFTRACE 220 so->so_mowner = &nfs_mowner; 221 so->so_rcv.sb_mowner = &nfs_mowner; 222 so->so_snd.sb_mowner = &nfs_mowner; 223 #endif 224 nmp->nm_soflags = so->so_proto->pr_flags; 225 226 /* 227 * Some servers require that the client port be a reserved port number. 228 */ 229 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 230 val = IP_PORTRANGE_LOW; 231 232 if ((error = so_setsockopt(NULL, so, IPPROTO_IP, IP_PORTRANGE, 233 &val, sizeof(val)))) 234 goto bad; 235 m = m_get(M_WAIT, MT_SONAME); 236 MCLAIM(m, so->so_mowner); 237 sin = mtod(m, struct sockaddr_in *); 238 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 239 sin->sin_family = AF_INET; 240 sin->sin_addr.s_addr = INADDR_ANY; 241 sin->sin_port = 0; 242 error = sobind(so, m, &lwp0); 243 m_freem(m); 244 if (error) 245 goto bad; 246 } 247 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 248 val = IPV6_PORTRANGE_LOW; 249 250 if ((error = so_setsockopt(NULL, so, IPPROTO_IPV6, 251 IPV6_PORTRANGE, &val, sizeof(val)))) 252 goto bad; 253 m = m_get(M_WAIT, MT_SONAME); 254 MCLAIM(m, so->so_mowner); 255 sin6 = mtod(m, struct sockaddr_in6 *); 256 memset(sin6, 0, sizeof(*sin6)); 257 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 258 sin6->sin6_family = AF_INET6; 259 error = sobind(so, m, &lwp0); 260 m_freem(m); 261 if (error) 262 goto bad; 263 } 264 265 /* 266 * Protocols that do not require connections may be optionally left 267 * unconnected for servers that reply from a port other than NFS_PORT. 268 */ 269 solock(so); 270 if (nmp->nm_flag & NFSMNT_NOCONN) { 271 if (nmp->nm_soflags & PR_CONNREQUIRED) { 272 sounlock(so); 273 error = ENOTCONN; 274 goto bad; 275 } 276 } else { 277 error = soconnect(so, nmp->nm_nam, l); 278 if (error) { 279 sounlock(so); 280 goto bad; 281 } 282 283 /* 284 * Wait for the connection to complete. Cribbed from the 285 * connect system call but with the wait timing out so 286 * that interruptible mounts don't hang here for a long time. 287 */ 288 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 289 (void)sowait(so, 2 * hz); 290 if ((so->so_state & SS_ISCONNECTING) && 291 so->so_error == 0 && rep && 292 (error = nfs_sigintr(nmp, rep, rep->r_lwp)) != 0){ 293 so->so_state &= ~SS_ISCONNECTING; 294 sounlock(so); 295 goto bad; 296 } 297 } 298 if (so->so_error) { 299 error = so->so_error; 300 so->so_error = 0; 301 sounlock(so); 302 goto bad; 303 } 304 } 305 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 306 so->so_rcv.sb_timeo = (5 * hz); 307 so->so_snd.sb_timeo = (5 * hz); 308 } else { 309 /* 310 * enable receive timeout to detect server crash and reconnect. 311 * otherwise, we can be stuck in soreceive forever. 312 */ 313 so->so_rcv.sb_timeo = (5 * hz); 314 so->so_snd.sb_timeo = 0; 315 } 316 if (nmp->nm_sotype == SOCK_DGRAM) { 317 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 318 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 319 NFS_MAXPKTHDR) * 2; 320 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 321 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 322 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 323 NFS_MAXPKTHDR) * 2; 324 } else { 325 sounlock(so); 326 if (nmp->nm_sotype != SOCK_STREAM) 327 panic("nfscon sotype"); 328 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 329 val = 1; 330 so_setsockopt(NULL, so, SOL_SOCKET, SO_KEEPALIVE, &val, 331 sizeof(val)); 332 } 333 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 334 val = 1; 335 so_setsockopt(NULL, so, IPPROTO_TCP, TCP_NODELAY, &val, 336 sizeof(val)); 337 } 338 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 339 sizeof (u_int32_t)) * 2; 340 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 341 sizeof (u_int32_t)) * 2; 342 solock(so); 343 } 344 error = soreserve(so, sndreserve, rcvreserve); 345 if (error) { 346 sounlock(so); 347 goto bad; 348 } 349 so->so_rcv.sb_flags |= SB_NOINTR; 350 so->so_snd.sb_flags |= SB_NOINTR; 351 sounlock(so); 352 353 /* Initialize other non-zero congestion variables */ 354 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 355 NFS_TIMEO << 3; 356 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 357 nmp->nm_sdrtt[3] = 0; 358 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 359 nmp->nm_sent = 0; 360 nmp->nm_timeouts = 0; 361 return (0); 362 363 bad: 364 nfs_disconnect(nmp); 365 return (error); 366 } 367 368 /* 369 * Reconnect routine: 370 * Called when a connection is broken on a reliable protocol. 371 * - clean up the old socket 372 * - nfs_connect() again 373 * - set R_MUSTRESEND for all outstanding requests on mount point 374 * If this fails the mount point is DEAD! 375 * nb: Must be called with the nfs_sndlock() set on the mount point. 376 */ 377 int 378 nfs_reconnect(struct nfsreq *rep) 379 { 380 struct nfsreq *rp; 381 struct nfsmount *nmp = rep->r_nmp; 382 int error; 383 384 nfs_disconnect(nmp); 385 while ((error = nfs_connect(nmp, rep, &lwp0)) != 0) { 386 if (error == EINTR || error == ERESTART) 387 return (EINTR); 388 kpause("nfscn2", false, hz, NULL); 389 } 390 391 /* 392 * Loop through outstanding request list and fix up all requests 393 * on old socket. 394 */ 395 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 396 if (rp->r_nmp == nmp) { 397 if ((rp->r_flags & R_MUSTRESEND) == 0) 398 rp->r_flags |= R_MUSTRESEND | R_REXMITTED; 399 rp->r_rexmit = 0; 400 } 401 } 402 return (0); 403 } 404 405 /* 406 * NFS disconnect. Clean up and unlink. 407 */ 408 void 409 nfs_disconnect(nmp) 410 struct nfsmount *nmp; 411 { 412 struct socket *so; 413 int drain = 0; 414 415 if (nmp->nm_so) { 416 so = nmp->nm_so; 417 nmp->nm_so = (struct socket *)0; 418 solock(so); 419 soshutdown(so, SHUT_RDWR); 420 sounlock(so); 421 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 422 if (drain) { 423 /* 424 * soshutdown() above should wake up the current 425 * listener. 426 * Now wake up those waiting for the receive lock, and 427 * wait for them to go away unhappy, to prevent *nmp 428 * from evaporating while they're sleeping. 429 */ 430 mutex_enter(&nmp->nm_lock); 431 while (nmp->nm_waiters > 0) { 432 cv_broadcast(&nmp->nm_rcvcv); 433 cv_broadcast(&nmp->nm_sndcv); 434 cv_wait(&nmp->nm_disconcv, &nmp->nm_lock); 435 } 436 mutex_exit(&nmp->nm_lock); 437 } 438 soclose(so); 439 } 440 #ifdef DIAGNOSTIC 441 if (drain && (nmp->nm_waiters > 0)) 442 panic("nfs_disconnect: waiters left after drain?"); 443 #endif 444 } 445 446 void 447 nfs_safedisconnect(nmp) 448 struct nfsmount *nmp; 449 { 450 struct nfsreq dummyreq; 451 452 memset(&dummyreq, 0, sizeof(dummyreq)); 453 dummyreq.r_nmp = nmp; 454 nfs_rcvlock(nmp, &dummyreq); /* XXX ignored error return */ 455 nfs_disconnect(nmp); 456 nfs_rcvunlock(nmp); 457 } 458 459 /* 460 * This is the nfs send routine. For connection based socket types, it 461 * must be called with an nfs_sndlock() on the socket. 462 * "rep == NULL" indicates that it has been called from a server. 463 * For the client side: 464 * - return EINTR if the RPC is terminated, 0 otherwise 465 * - set R_MUSTRESEND if the send fails for any reason 466 * - do any cleanup required by recoverable socket errors (? ? ?) 467 * For the server side: 468 * - return EINTR or ERESTART if interrupted by a signal 469 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 470 * - do any cleanup required by recoverable socket errors (? ? ?) 471 */ 472 int 473 nfs_send(so, nam, top, rep, l) 474 struct socket *so; 475 struct mbuf *nam; 476 struct mbuf *top; 477 struct nfsreq *rep; 478 struct lwp *l; 479 { 480 struct mbuf *sendnam; 481 int error, soflags, flags; 482 483 /* XXX nfs_doio()/nfs_request() calls with rep->r_lwp == NULL */ 484 if (l == NULL && rep->r_lwp == NULL) 485 l = curlwp; 486 487 if (rep) { 488 if (rep->r_flags & R_SOFTTERM) { 489 m_freem(top); 490 return (EINTR); 491 } 492 if ((so = rep->r_nmp->nm_so) == NULL) { 493 rep->r_flags |= R_MUSTRESEND; 494 m_freem(top); 495 return (0); 496 } 497 rep->r_flags &= ~R_MUSTRESEND; 498 soflags = rep->r_nmp->nm_soflags; 499 } else 500 soflags = so->so_proto->pr_flags; 501 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 502 sendnam = (struct mbuf *)0; 503 else 504 sendnam = nam; 505 if (so->so_type == SOCK_SEQPACKET) 506 flags = MSG_EOR; 507 else 508 flags = 0; 509 510 error = (*so->so_send)(so, sendnam, NULL, top, NULL, flags, l); 511 if (error) { 512 if (rep) { 513 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 514 /* 515 * We're too fast for the network/driver, 516 * and UDP isn't flowcontrolled. 517 * We need to resend. This is not fatal, 518 * just try again. 519 * 520 * Could be smarter here by doing some sort 521 * of a backoff, but this is rare. 522 */ 523 rep->r_flags |= R_MUSTRESEND; 524 } else { 525 if (error != EPIPE) 526 log(LOG_INFO, 527 "nfs send error %d for %s\n", 528 error, 529 rep->r_nmp->nm_mountp-> 530 mnt_stat.f_mntfromname); 531 /* 532 * Deal with errors for the client side. 533 */ 534 if (rep->r_flags & R_SOFTTERM) 535 error = EINTR; 536 else 537 rep->r_flags |= R_MUSTRESEND; 538 } 539 } else { 540 /* 541 * See above. This error can happen under normal 542 * circumstances and the log is too noisy. 543 * The error will still show up in nfsstat. 544 */ 545 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 546 log(LOG_INFO, "nfsd send error %d\n", error); 547 } 548 549 /* 550 * Handle any recoverable (soft) socket errors here. (? ? ?) 551 */ 552 if (error != EINTR && error != ERESTART && 553 error != EWOULDBLOCK && error != EPIPE) 554 error = 0; 555 } 556 return (error); 557 } 558 559 #ifdef NFS 560 /* 561 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 562 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 563 * Mark and consolidate the data into a new mbuf list. 564 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 565 * small mbufs. 566 * For SOCK_STREAM we must be very careful to read an entire record once 567 * we have read any of it, even if the system call has been interrupted. 568 */ 569 static int 570 nfs_receive(struct nfsreq *rep, struct mbuf **aname, struct mbuf **mp, 571 struct lwp *l) 572 { 573 struct socket *so; 574 struct uio auio; 575 struct iovec aio; 576 struct mbuf *m; 577 struct mbuf *control; 578 u_int32_t len; 579 struct mbuf **getnam; 580 int error, sotype, rcvflg; 581 582 /* 583 * Set up arguments for soreceive() 584 */ 585 *mp = (struct mbuf *)0; 586 *aname = (struct mbuf *)0; 587 sotype = rep->r_nmp->nm_sotype; 588 589 /* 590 * For reliable protocols, lock against other senders/receivers 591 * in case a reconnect is necessary. 592 * For SOCK_STREAM, first get the Record Mark to find out how much 593 * more there is to get. 594 * We must lock the socket against other receivers 595 * until we have an entire rpc request/reply. 596 */ 597 if (sotype != SOCK_DGRAM) { 598 error = nfs_sndlock(rep->r_nmp, rep); 599 if (error) 600 return (error); 601 tryagain: 602 /* 603 * Check for fatal errors and resending request. 604 */ 605 /* 606 * Ugh: If a reconnect attempt just happened, nm_so 607 * would have changed. NULL indicates a failed 608 * attempt that has essentially shut down this 609 * mount point. 610 */ 611 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 612 nfs_sndunlock(rep->r_nmp); 613 return (EINTR); 614 } 615 so = rep->r_nmp->nm_so; 616 if (!so) { 617 error = nfs_reconnect(rep); 618 if (error) { 619 nfs_sndunlock(rep->r_nmp); 620 return (error); 621 } 622 goto tryagain; 623 } 624 while (rep->r_flags & R_MUSTRESEND) { 625 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 626 nfsstats.rpcretries++; 627 rep->r_rtt = 0; 628 rep->r_flags &= ~R_TIMING; 629 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, l); 630 if (error) { 631 if (error == EINTR || error == ERESTART || 632 (error = nfs_reconnect(rep)) != 0) { 633 nfs_sndunlock(rep->r_nmp); 634 return (error); 635 } 636 goto tryagain; 637 } 638 } 639 nfs_sndunlock(rep->r_nmp); 640 if (sotype == SOCK_STREAM) { 641 aio.iov_base = (void *) &len; 642 aio.iov_len = sizeof(u_int32_t); 643 auio.uio_iov = &aio; 644 auio.uio_iovcnt = 1; 645 auio.uio_rw = UIO_READ; 646 auio.uio_offset = 0; 647 auio.uio_resid = sizeof(u_int32_t); 648 UIO_SETUP_SYSSPACE(&auio); 649 do { 650 rcvflg = MSG_WAITALL; 651 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 652 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 653 if (error == EWOULDBLOCK && rep) { 654 if (rep->r_flags & R_SOFTTERM) 655 return (EINTR); 656 /* 657 * if it seems that the server died after it 658 * received our request, set EPIPE so that 659 * we'll reconnect and retransmit requests. 660 */ 661 if (rep->r_rexmit >= rep->r_nmp->nm_retry) { 662 nfsstats.rpctimeouts++; 663 error = EPIPE; 664 } 665 } 666 } while (error == EWOULDBLOCK); 667 if (!error && auio.uio_resid > 0) { 668 /* 669 * Don't log a 0 byte receive; it means 670 * that the socket has been closed, and 671 * can happen during normal operation 672 * (forcible unmount or Solaris server). 673 */ 674 if (auio.uio_resid != sizeof (u_int32_t)) 675 log(LOG_INFO, 676 "short receive (%lu/%lu) from nfs server %s\n", 677 (u_long)sizeof(u_int32_t) - auio.uio_resid, 678 (u_long)sizeof(u_int32_t), 679 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 680 error = EPIPE; 681 } 682 if (error) 683 goto errout; 684 len = ntohl(len) & ~0x80000000; 685 /* 686 * This is SERIOUS! We are out of sync with the sender 687 * and forcing a disconnect/reconnect is all I can do. 688 */ 689 if (len > NFS_MAXPACKET) { 690 log(LOG_ERR, "%s (%d) from nfs server %s\n", 691 "impossible packet length", 692 len, 693 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 694 error = EFBIG; 695 goto errout; 696 } 697 auio.uio_resid = len; 698 do { 699 rcvflg = MSG_WAITALL; 700 error = (*so->so_receive)(so, (struct mbuf **)0, 701 &auio, mp, (struct mbuf **)0, &rcvflg); 702 } while (error == EWOULDBLOCK || error == EINTR || 703 error == ERESTART); 704 if (!error && auio.uio_resid > 0) { 705 if (len != auio.uio_resid) 706 log(LOG_INFO, 707 "short receive (%lu/%d) from nfs server %s\n", 708 (u_long)len - auio.uio_resid, len, 709 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 710 error = EPIPE; 711 } 712 } else { 713 /* 714 * NB: Since uio_resid is big, MSG_WAITALL is ignored 715 * and soreceive() will return when it has either a 716 * control msg or a data msg. 717 * We have no use for control msg., but must grab them 718 * and then throw them away so we know what is going 719 * on. 720 */ 721 auio.uio_resid = len = 100000000; /* Anything Big */ 722 /* not need to setup uio_vmspace */ 723 do { 724 rcvflg = 0; 725 error = (*so->so_receive)(so, (struct mbuf **)0, 726 &auio, mp, &control, &rcvflg); 727 if (control) 728 m_freem(control); 729 if (error == EWOULDBLOCK && rep) { 730 if (rep->r_flags & R_SOFTTERM) 731 return (EINTR); 732 } 733 } while (error == EWOULDBLOCK || 734 (!error && *mp == NULL && control)); 735 if ((rcvflg & MSG_EOR) == 0) 736 printf("Egad!!\n"); 737 if (!error && *mp == NULL) 738 error = EPIPE; 739 len -= auio.uio_resid; 740 } 741 errout: 742 if (error && error != EINTR && error != ERESTART) { 743 m_freem(*mp); 744 *mp = (struct mbuf *)0; 745 if (error != EPIPE) 746 log(LOG_INFO, 747 "receive error %d from nfs server %s\n", 748 error, 749 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 750 error = nfs_sndlock(rep->r_nmp, rep); 751 if (!error) 752 error = nfs_reconnect(rep); 753 if (!error) 754 goto tryagain; 755 else 756 nfs_sndunlock(rep->r_nmp); 757 } 758 } else { 759 if ((so = rep->r_nmp->nm_so) == NULL) 760 return (EACCES); 761 if (so->so_state & SS_ISCONNECTED) 762 getnam = (struct mbuf **)0; 763 else 764 getnam = aname; 765 auio.uio_resid = len = 1000000; 766 /* not need to setup uio_vmspace */ 767 do { 768 rcvflg = 0; 769 error = (*so->so_receive)(so, getnam, &auio, mp, 770 (struct mbuf **)0, &rcvflg); 771 if (error == EWOULDBLOCK && 772 (rep->r_flags & R_SOFTTERM)) 773 return (EINTR); 774 } while (error == EWOULDBLOCK); 775 len -= auio.uio_resid; 776 if (!error && *mp == NULL) 777 error = EPIPE; 778 } 779 if (error) { 780 m_freem(*mp); 781 *mp = (struct mbuf *)0; 782 } 783 return (error); 784 } 785 786 /* 787 * Implement receipt of reply on a socket. 788 * We must search through the list of received datagrams matching them 789 * with outstanding requests using the xid, until ours is found. 790 */ 791 /* ARGSUSED */ 792 static int 793 nfs_reply(struct nfsreq *myrep, struct lwp *lwp) 794 { 795 struct nfsreq *rep; 796 struct nfsmount *nmp = myrep->r_nmp; 797 int32_t t1; 798 struct mbuf *mrep, *nam, *md; 799 u_int32_t rxid, *tl; 800 char *dpos, *cp2; 801 int error; 802 803 /* 804 * Loop around until we get our own reply 805 */ 806 for (;;) { 807 /* 808 * Lock against other receivers so that I don't get stuck in 809 * sbwait() after someone else has received my reply for me. 810 * Also necessary for connection based protocols to avoid 811 * race conditions during a reconnect. 812 */ 813 error = nfs_rcvlock(nmp, myrep); 814 if (error == EALREADY) 815 return (0); 816 if (error) 817 return (error); 818 /* 819 * Get the next Rpc reply off the socket 820 */ 821 822 mutex_enter(&nmp->nm_lock); 823 nmp->nm_waiters++; 824 mutex_exit(&nmp->nm_lock); 825 826 error = nfs_receive(myrep, &nam, &mrep, lwp); 827 828 mutex_enter(&nmp->nm_lock); 829 nmp->nm_waiters--; 830 cv_signal(&nmp->nm_disconcv); 831 mutex_exit(&nmp->nm_lock); 832 833 if (error) { 834 nfs_rcvunlock(nmp); 835 836 if (nmp->nm_iflag & NFSMNT_DISMNT) { 837 /* 838 * Oops, we're going away now.. 839 */ 840 return error; 841 } 842 /* 843 * Ignore routing errors on connectionless protocols? ? 844 */ 845 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 846 nmp->nm_so->so_error = 0; 847 #ifdef DEBUG 848 if (ratecheck(&nfs_reply_last_err_time, 849 &nfs_err_interval)) 850 printf("%s: ignoring error %d\n", 851 __func__, error); 852 #endif 853 continue; 854 } 855 return (error); 856 } 857 if (nam) 858 m_freem(nam); 859 860 /* 861 * Get the xid and check that it is an rpc reply 862 */ 863 md = mrep; 864 dpos = mtod(md, void *); 865 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 866 rxid = *tl++; 867 if (*tl != rpc_reply) { 868 nfsstats.rpcinvalid++; 869 m_freem(mrep); 870 nfsmout: 871 nfs_rcvunlock(nmp); 872 continue; 873 } 874 875 /* 876 * Loop through the request list to match up the reply 877 * Iff no match, just drop the datagram 878 */ 879 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 880 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 881 /* Found it.. */ 882 rep->r_mrep = mrep; 883 rep->r_md = md; 884 rep->r_dpos = dpos; 885 if (nfsrtton) { 886 struct rttl *rt; 887 888 rt = &nfsrtt.rttl[nfsrtt.pos]; 889 rt->proc = rep->r_procnum; 890 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 891 rt->sent = nmp->nm_sent; 892 rt->cwnd = nmp->nm_cwnd; 893 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 894 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 895 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; 896 getmicrotime(&rt->tstamp); 897 if (rep->r_flags & R_TIMING) 898 rt->rtt = rep->r_rtt; 899 else 900 rt->rtt = 1000000; 901 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 902 } 903 /* 904 * Update congestion window. 905 * Do the additive increase of 906 * one rpc/rtt. 907 */ 908 if (nmp->nm_cwnd <= nmp->nm_sent) { 909 nmp->nm_cwnd += 910 (NFS_CWNDSCALE * NFS_CWNDSCALE + 911 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 912 if (nmp->nm_cwnd > NFS_MAXCWND) 913 nmp->nm_cwnd = NFS_MAXCWND; 914 } 915 rep->r_flags &= ~R_SENT; 916 nmp->nm_sent -= NFS_CWNDSCALE; 917 /* 918 * Update rtt using a gain of 0.125 on the mean 919 * and a gain of 0.25 on the deviation. 920 */ 921 if (rep->r_flags & R_TIMING) { 922 /* 923 * Since the timer resolution of 924 * NFS_HZ is so course, it can often 925 * result in r_rtt == 0. Since 926 * r_rtt == N means that the actual 927 * rtt is between N+dt and N+2-dt ticks, 928 * add 1. 929 */ 930 t1 = rep->r_rtt + 1; 931 t1 -= (NFS_SRTT(rep) >> 3); 932 NFS_SRTT(rep) += t1; 933 if (t1 < 0) 934 t1 = -t1; 935 t1 -= (NFS_SDRTT(rep) >> 2); 936 NFS_SDRTT(rep) += t1; 937 } 938 nmp->nm_timeouts = 0; 939 break; 940 } 941 } 942 nfs_rcvunlock(nmp); 943 /* 944 * If not matched to a request, drop it. 945 * If it's mine, get out. 946 */ 947 if (rep == 0) { 948 nfsstats.rpcunexpected++; 949 m_freem(mrep); 950 } else if (rep == myrep) { 951 if (rep->r_mrep == NULL) 952 panic("nfsreply nil"); 953 return (0); 954 } 955 } 956 } 957 958 /* 959 * nfs_request - goes something like this 960 * - fill in request struct 961 * - links it into list 962 * - calls nfs_send() for first transmit 963 * - calls nfs_receive() to get reply 964 * - break down rpc header and return with nfs reply pointed to 965 * by mrep or error 966 * nb: always frees up mreq mbuf list 967 */ 968 int 969 nfs_request(np, mrest, procnum, lwp, cred, mrp, mdp, dposp, rexmitp) 970 struct nfsnode *np; 971 struct mbuf *mrest; 972 int procnum; 973 struct lwp *lwp; 974 kauth_cred_t cred; 975 struct mbuf **mrp; 976 struct mbuf **mdp; 977 char **dposp; 978 int *rexmitp; 979 { 980 struct mbuf *m, *mrep; 981 struct nfsreq *rep; 982 u_int32_t *tl; 983 int i; 984 struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); 985 struct mbuf *md, *mheadend; 986 char nickv[RPCX_NICKVERF]; 987 time_t waituntil; 988 char *dpos, *cp2; 989 int t1, s, error = 0, mrest_len, auth_len, auth_type; 990 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 991 int verf_len, verf_type; 992 u_int32_t xid; 993 char *auth_str, *verf_str; 994 NFSKERBKEY_T key; /* save session key */ 995 kauth_cred_t acred; 996 struct mbuf *mrest_backup = NULL; 997 kauth_cred_t origcred = NULL; /* XXX: gcc */ 998 bool retry_cred = true; 999 bool use_opencred = (np->n_flag & NUSEOPENCRED) != 0; 1000 1001 if (rexmitp != NULL) 1002 *rexmitp = 0; 1003 1004 acred = kauth_cred_alloc(); 1005 1006 tryagain_cred: 1007 KASSERT(cred != NULL); 1008 rep = kmem_alloc(sizeof(*rep), KM_SLEEP); 1009 rep->r_nmp = nmp; 1010 KASSERT(lwp == NULL || lwp == curlwp); 1011 rep->r_lwp = lwp; 1012 rep->r_procnum = procnum; 1013 i = 0; 1014 m = mrest; 1015 while (m) { 1016 i += m->m_len; 1017 m = m->m_next; 1018 } 1019 mrest_len = i; 1020 1021 /* 1022 * Get the RPC header with authorization. 1023 */ 1024 kerbauth: 1025 verf_str = auth_str = (char *)0; 1026 if (nmp->nm_flag & NFSMNT_KERB) { 1027 verf_str = nickv; 1028 verf_len = sizeof (nickv); 1029 auth_type = RPCAUTH_KERB4; 1030 memset((void *)key, 0, sizeof (key)); 1031 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 1032 &auth_len, verf_str, verf_len)) { 1033 error = nfs_getauth(nmp, rep, cred, &auth_str, 1034 &auth_len, verf_str, &verf_len, key); 1035 if (error) { 1036 kmem_free(rep, sizeof(*rep)); 1037 m_freem(mrest); 1038 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1039 kauth_cred_free(acred); 1040 return (error); 1041 } 1042 } 1043 retry_cred = false; 1044 } else { 1045 /* AUTH_UNIX */ 1046 uid_t uid; 1047 gid_t gid; 1048 1049 /* 1050 * on the most unix filesystems, permission checks are 1051 * done when the file is open(2)'ed. 1052 * ie. once a file is successfully open'ed, 1053 * following i/o operations never fail with EACCES. 1054 * we try to follow the semantics as far as possible. 1055 * 1056 * note that we expect that the nfs server always grant 1057 * accesses by the file's owner. 1058 */ 1059 origcred = cred; 1060 switch (procnum) { 1061 case NFSPROC_READ: 1062 case NFSPROC_WRITE: 1063 case NFSPROC_COMMIT: 1064 uid = np->n_vattr->va_uid; 1065 gid = np->n_vattr->va_gid; 1066 if (kauth_cred_geteuid(cred) == uid && 1067 kauth_cred_getegid(cred) == gid) { 1068 retry_cred = false; 1069 break; 1070 } 1071 if (use_opencred) 1072 break; 1073 kauth_cred_setuid(acred, uid); 1074 kauth_cred_seteuid(acred, uid); 1075 kauth_cred_setsvuid(acred, uid); 1076 kauth_cred_setgid(acred, gid); 1077 kauth_cred_setegid(acred, gid); 1078 kauth_cred_setsvgid(acred, gid); 1079 cred = acred; 1080 break; 1081 default: 1082 retry_cred = false; 1083 break; 1084 } 1085 /* 1086 * backup mbuf chain if we can need it later to retry. 1087 * 1088 * XXX maybe we can keep a direct reference to 1089 * mrest without doing m_copym, but it's ...ugly. 1090 */ 1091 if (retry_cred) 1092 mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); 1093 auth_type = RPCAUTH_UNIX; 1094 /* XXX elad - ngroups */ 1095 auth_len = (((kauth_cred_ngroups(cred) > nmp->nm_numgrps) ? 1096 nmp->nm_numgrps : kauth_cred_ngroups(cred)) << 2) + 1097 5 * NFSX_UNSIGNED; 1098 } 1099 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1100 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1101 if (auth_str) 1102 free(auth_str, M_TEMP); 1103 1104 /* 1105 * For stream protocols, insert a Sun RPC Record Mark. 1106 */ 1107 if (nmp->nm_sotype == SOCK_STREAM) { 1108 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1109 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1110 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1111 } 1112 rep->r_mreq = m; 1113 rep->r_xid = xid; 1114 tryagain: 1115 if (nmp->nm_flag & NFSMNT_SOFT) 1116 rep->r_retry = nmp->nm_retry; 1117 else 1118 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1119 rep->r_rtt = rep->r_rexmit = 0; 1120 if (proct[procnum] > 0) 1121 rep->r_flags = R_TIMING; 1122 else 1123 rep->r_flags = 0; 1124 rep->r_mrep = NULL; 1125 1126 /* 1127 * Do the client side RPC. 1128 */ 1129 nfsstats.rpcrequests++; 1130 /* 1131 * Chain request into list of outstanding requests. Be sure 1132 * to put it LAST so timer finds oldest requests first. 1133 */ 1134 s = splsoftnet(); 1135 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1136 nfs_timer_start(); 1137 1138 /* 1139 * If backing off another request or avoiding congestion, don't 1140 * send this one now but let timer do it. If not timing a request, 1141 * do it now. 1142 */ 1143 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1144 (nmp->nm_flag & NFSMNT_DUMBTIMR) || nmp->nm_sent < nmp->nm_cwnd)) { 1145 splx(s); 1146 if (nmp->nm_soflags & PR_CONNREQUIRED) 1147 error = nfs_sndlock(nmp, rep); 1148 if (!error) { 1149 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1150 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, lwp); 1151 if (nmp->nm_soflags & PR_CONNREQUIRED) 1152 nfs_sndunlock(nmp); 1153 } 1154 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1155 nmp->nm_sent += NFS_CWNDSCALE; 1156 rep->r_flags |= R_SENT; 1157 } 1158 } else { 1159 splx(s); 1160 rep->r_rtt = -1; 1161 } 1162 1163 /* 1164 * Wait for the reply from our send or the timer's. 1165 */ 1166 if (!error || error == EPIPE) 1167 error = nfs_reply(rep, lwp); 1168 1169 /* 1170 * RPC done, unlink the request. 1171 */ 1172 s = splsoftnet(); 1173 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1174 splx(s); 1175 1176 /* 1177 * Decrement the outstanding request count. 1178 */ 1179 if (rep->r_flags & R_SENT) { 1180 rep->r_flags &= ~R_SENT; /* paranoia */ 1181 nmp->nm_sent -= NFS_CWNDSCALE; 1182 } 1183 1184 if (rexmitp != NULL) { 1185 int rexmit; 1186 1187 if (nmp->nm_sotype != SOCK_DGRAM) 1188 rexmit = (rep->r_flags & R_REXMITTED) != 0; 1189 else 1190 rexmit = rep->r_rexmit; 1191 *rexmitp = rexmit; 1192 } 1193 1194 /* 1195 * If there was a successful reply and a tprintf msg. 1196 * tprintf a response. 1197 */ 1198 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1199 nfs_msg(rep->r_lwp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1200 "is alive again"); 1201 mrep = rep->r_mrep; 1202 md = rep->r_md; 1203 dpos = rep->r_dpos; 1204 if (error) 1205 goto nfsmout; 1206 1207 /* 1208 * break down the rpc header and check if ok 1209 */ 1210 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1211 if (*tl++ == rpc_msgdenied) { 1212 if (*tl == rpc_mismatch) 1213 error = EOPNOTSUPP; 1214 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1215 if (!failed_auth) { 1216 failed_auth++; 1217 mheadend->m_next = (struct mbuf *)0; 1218 m_freem(mrep); 1219 m_freem(rep->r_mreq); 1220 goto kerbauth; 1221 } else 1222 error = EAUTH; 1223 } else 1224 error = EACCES; 1225 m_freem(mrep); 1226 goto nfsmout; 1227 } 1228 1229 /* 1230 * Grab any Kerberos verifier, otherwise just throw it away. 1231 */ 1232 verf_type = fxdr_unsigned(int, *tl++); 1233 i = fxdr_unsigned(int32_t, *tl); 1234 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1235 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1236 if (error) 1237 goto nfsmout; 1238 } else if (i > 0) 1239 nfsm_adv(nfsm_rndup(i)); 1240 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1241 /* 0 == ok */ 1242 if (*tl == 0) { 1243 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1244 if (*tl != 0) { 1245 error = fxdr_unsigned(int, *tl); 1246 switch (error) { 1247 case NFSERR_PERM: 1248 error = EPERM; 1249 break; 1250 1251 case NFSERR_NOENT: 1252 error = ENOENT; 1253 break; 1254 1255 case NFSERR_IO: 1256 error = EIO; 1257 break; 1258 1259 case NFSERR_NXIO: 1260 error = ENXIO; 1261 break; 1262 1263 case NFSERR_ACCES: 1264 error = EACCES; 1265 if (!retry_cred) 1266 break; 1267 m_freem(mrep); 1268 m_freem(rep->r_mreq); 1269 kmem_free(rep, sizeof(*rep)); 1270 use_opencred = !use_opencred; 1271 if (mrest_backup == NULL) { 1272 /* m_copym failure */ 1273 KASSERT( 1274 kauth_cred_getrefcnt(acred) == 1); 1275 kauth_cred_free(acred); 1276 return ENOMEM; 1277 } 1278 mrest = mrest_backup; 1279 mrest_backup = NULL; 1280 cred = origcred; 1281 error = 0; 1282 retry_cred = false; 1283 goto tryagain_cred; 1284 1285 case NFSERR_EXIST: 1286 error = EEXIST; 1287 break; 1288 1289 case NFSERR_XDEV: 1290 error = EXDEV; 1291 break; 1292 1293 case NFSERR_NODEV: 1294 error = ENODEV; 1295 break; 1296 1297 case NFSERR_NOTDIR: 1298 error = ENOTDIR; 1299 break; 1300 1301 case NFSERR_ISDIR: 1302 error = EISDIR; 1303 break; 1304 1305 case NFSERR_INVAL: 1306 error = EINVAL; 1307 break; 1308 1309 case NFSERR_FBIG: 1310 error = EFBIG; 1311 break; 1312 1313 case NFSERR_NOSPC: 1314 error = ENOSPC; 1315 break; 1316 1317 case NFSERR_ROFS: 1318 error = EROFS; 1319 break; 1320 1321 case NFSERR_MLINK: 1322 error = EMLINK; 1323 break; 1324 1325 case NFSERR_TIMEDOUT: 1326 error = ETIMEDOUT; 1327 break; 1328 1329 case NFSERR_NAMETOL: 1330 error = ENAMETOOLONG; 1331 break; 1332 1333 case NFSERR_NOTEMPTY: 1334 error = ENOTEMPTY; 1335 break; 1336 1337 case NFSERR_DQUOT: 1338 error = EDQUOT; 1339 break; 1340 1341 case NFSERR_STALE: 1342 /* 1343 * If the File Handle was stale, invalidate the 1344 * lookup cache, just in case. 1345 */ 1346 error = ESTALE; 1347 cache_purge(NFSTOV(np)); 1348 break; 1349 1350 case NFSERR_REMOTE: 1351 error = EREMOTE; 1352 break; 1353 1354 case NFSERR_WFLUSH: 1355 case NFSERR_BADHANDLE: 1356 case NFSERR_NOT_SYNC: 1357 case NFSERR_BAD_COOKIE: 1358 error = EINVAL; 1359 break; 1360 1361 case NFSERR_NOTSUPP: 1362 error = ENOTSUP; 1363 break; 1364 1365 case NFSERR_TOOSMALL: 1366 case NFSERR_SERVERFAULT: 1367 case NFSERR_BADTYPE: 1368 error = EINVAL; 1369 break; 1370 1371 case NFSERR_TRYLATER: 1372 if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) 1373 break; 1374 m_freem(mrep); 1375 error = 0; 1376 waituntil = time_second + trylater_delay; 1377 while (time_second < waituntil) { 1378 kpause("nfstrylater", false, hz, NULL); 1379 } 1380 trylater_delay *= NFS_TRYLATERDELMUL; 1381 if (trylater_delay > NFS_TRYLATERDELMAX) 1382 trylater_delay = NFS_TRYLATERDELMAX; 1383 /* 1384 * RFC1813: 1385 * The client should wait and then try 1386 * the request with a new RPC transaction ID. 1387 */ 1388 nfs_renewxid(rep); 1389 goto tryagain; 1390 1391 default: 1392 #ifdef DIAGNOSTIC 1393 printf("Invalid rpc error code %d\n", error); 1394 #endif 1395 error = EINVAL; 1396 break; 1397 } 1398 1399 if (nmp->nm_flag & NFSMNT_NFSV3) { 1400 *mrp = mrep; 1401 *mdp = md; 1402 *dposp = dpos; 1403 error |= NFSERR_RETERR; 1404 } else 1405 m_freem(mrep); 1406 goto nfsmout; 1407 } 1408 1409 /* 1410 * note which credential worked to minimize number of retries. 1411 */ 1412 if (use_opencred) 1413 np->n_flag |= NUSEOPENCRED; 1414 else 1415 np->n_flag &= ~NUSEOPENCRED; 1416 1417 *mrp = mrep; 1418 *mdp = md; 1419 *dposp = dpos; 1420 1421 KASSERT(error == 0); 1422 goto nfsmout; 1423 } 1424 m_freem(mrep); 1425 error = EPROTONOSUPPORT; 1426 nfsmout: 1427 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1428 kauth_cred_free(acred); 1429 m_freem(rep->r_mreq); 1430 kmem_free(rep, sizeof(*rep)); 1431 m_freem(mrest_backup); 1432 return (error); 1433 } 1434 #endif /* NFS */ 1435 1436 /* 1437 * Generate the rpc reply header 1438 * siz arg. is used to decide if adding a cluster is worthwhile 1439 */ 1440 int 1441 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1442 int siz; 1443 struct nfsrv_descript *nd; 1444 struct nfssvc_sock *slp; 1445 int err; 1446 int cache; 1447 u_quad_t *frev; 1448 struct mbuf **mrq; 1449 struct mbuf **mbp; 1450 char **bposp; 1451 { 1452 u_int32_t *tl; 1453 struct mbuf *mreq; 1454 char *bpos; 1455 struct mbuf *mb; 1456 1457 mreq = m_gethdr(M_WAIT, MT_DATA); 1458 MCLAIM(mreq, &nfs_mowner); 1459 mb = mreq; 1460 /* 1461 * If this is a big reply, use a cluster else 1462 * try and leave leading space for the lower level headers. 1463 */ 1464 siz += RPC_REPLYSIZ; 1465 if (siz >= max_datalen) { 1466 m_clget(mreq, M_WAIT); 1467 } else 1468 mreq->m_data += max_hdr; 1469 tl = mtod(mreq, u_int32_t *); 1470 mreq->m_len = 6 * NFSX_UNSIGNED; 1471 bpos = ((char *)tl) + mreq->m_len; 1472 *tl++ = txdr_unsigned(nd->nd_retxid); 1473 *tl++ = rpc_reply; 1474 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1475 *tl++ = rpc_msgdenied; 1476 if (err & NFSERR_AUTHERR) { 1477 *tl++ = rpc_autherr; 1478 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1479 mreq->m_len -= NFSX_UNSIGNED; 1480 bpos -= NFSX_UNSIGNED; 1481 } else { 1482 *tl++ = rpc_mismatch; 1483 *tl++ = txdr_unsigned(RPC_VER2); 1484 *tl = txdr_unsigned(RPC_VER2); 1485 } 1486 } else { 1487 *tl++ = rpc_msgaccepted; 1488 1489 /* 1490 * For Kerberos authentication, we must send the nickname 1491 * verifier back, otherwise just RPCAUTH_NULL. 1492 */ 1493 if (nd->nd_flag & ND_KERBFULL) { 1494 struct nfsuid *nuidp; 1495 struct timeval ktvin, ktvout; 1496 1497 memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ 1498 1499 LIST_FOREACH(nuidp, 1500 NUIDHASH(slp, kauth_cred_geteuid(nd->nd_cr)), 1501 nu_hash) { 1502 if (kauth_cred_geteuid(nuidp->nu_cr) == 1503 kauth_cred_geteuid(nd->nd_cr) && 1504 (!nd->nd_nam2 || netaddr_match( 1505 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1506 nd->nd_nam2))) 1507 break; 1508 } 1509 if (nuidp) { 1510 ktvin.tv_sec = 1511 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1512 - 1); 1513 ktvin.tv_usec = 1514 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1515 1516 /* 1517 * Encrypt the timestamp in ecb mode using the 1518 * session key. 1519 */ 1520 #ifdef NFSKERB 1521 XXX 1522 #endif 1523 1524 *tl++ = rpc_auth_kerb; 1525 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1526 *tl = ktvout.tv_sec; 1527 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1528 *tl++ = ktvout.tv_usec; 1529 *tl++ = txdr_unsigned( 1530 kauth_cred_geteuid(nuidp->nu_cr)); 1531 } else { 1532 *tl++ = 0; 1533 *tl++ = 0; 1534 } 1535 } else { 1536 *tl++ = 0; 1537 *tl++ = 0; 1538 } 1539 switch (err) { 1540 case EPROGUNAVAIL: 1541 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1542 break; 1543 case EPROGMISMATCH: 1544 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1545 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1546 *tl++ = txdr_unsigned(2); 1547 *tl = txdr_unsigned(3); 1548 break; 1549 case EPROCUNAVAIL: 1550 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1551 break; 1552 case EBADRPC: 1553 *tl = txdr_unsigned(RPC_GARBAGE); 1554 break; 1555 default: 1556 *tl = 0; 1557 if (err != NFSERR_RETVOID) { 1558 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1559 if (err) 1560 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1561 else 1562 *tl = 0; 1563 } 1564 break; 1565 }; 1566 } 1567 1568 if (mrq != NULL) 1569 *mrq = mreq; 1570 *mbp = mb; 1571 *bposp = bpos; 1572 if (err != 0 && err != NFSERR_RETVOID) 1573 nfsstats.srvrpc_errs++; 1574 return (0); 1575 } 1576 1577 static void 1578 nfs_timer_schedule(void) 1579 { 1580 1581 callout_schedule(&nfs_timer_ch, nfs_ticks); 1582 } 1583 1584 void 1585 nfs_timer_start(void) 1586 { 1587 1588 if (callout_pending(&nfs_timer_ch)) 1589 return; 1590 1591 nfs_timer_start_ev.ev_count++; 1592 nfs_timer_schedule(); 1593 } 1594 1595 void 1596 nfs_timer_init(void) 1597 { 1598 1599 mutex_init(&nfs_timer_lock, MUTEX_DEFAULT, IPL_NONE); 1600 callout_init(&nfs_timer_ch, 0); 1601 callout_setfunc(&nfs_timer_ch, nfs_timer, NULL); 1602 evcnt_attach_dynamic(&nfs_timer_ev, EVCNT_TYPE_MISC, NULL, 1603 "nfs", "timer"); 1604 evcnt_attach_dynamic(&nfs_timer_start_ev, EVCNT_TYPE_MISC, NULL, 1605 "nfs", "timer start"); 1606 evcnt_attach_dynamic(&nfs_timer_stop_ev, EVCNT_TYPE_MISC, NULL, 1607 "nfs", "timer stop"); 1608 } 1609 1610 void 1611 nfs_timer_fini(void) 1612 { 1613 1614 callout_halt(&nfs_timer_ch, NULL); 1615 callout_destroy(&nfs_timer_ch); 1616 mutex_destroy(&nfs_timer_lock); 1617 evcnt_detach(&nfs_timer_ev); 1618 evcnt_detach(&nfs_timer_start_ev); 1619 evcnt_detach(&nfs_timer_stop_ev); 1620 } 1621 1622 void 1623 nfs_timer_srvinit(bool (*func)(void)) 1624 { 1625 1626 nfs_timer_srvvec = func; 1627 } 1628 1629 void 1630 nfs_timer_srvfini(void) 1631 { 1632 1633 mutex_enter(&nfs_timer_lock); 1634 nfs_timer_srvvec = NULL; 1635 mutex_exit(&nfs_timer_lock); 1636 } 1637 1638 1639 /* 1640 * Nfs timer routine 1641 * Scan the nfsreq list and retranmit any requests that have timed out 1642 * To avoid retransmission attempts on STREAM sockets (in the future) make 1643 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1644 */ 1645 void 1646 nfs_timer(void *arg) 1647 { 1648 struct nfsreq *rep; 1649 struct mbuf *m; 1650 struct socket *so; 1651 struct nfsmount *nmp; 1652 int timeo; 1653 int s, error; 1654 bool more = false; 1655 1656 nfs_timer_ev.ev_count++; 1657 1658 s = splsoftnet(); 1659 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1660 more = true; 1661 nmp = rep->r_nmp; 1662 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1663 continue; 1664 if (nfs_sigintr(nmp, rep, rep->r_lwp)) { 1665 rep->r_flags |= R_SOFTTERM; 1666 continue; 1667 } 1668 if (rep->r_rtt >= 0) { 1669 rep->r_rtt++; 1670 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1671 timeo = nmp->nm_timeo; 1672 else 1673 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1674 if (nmp->nm_timeouts > 0) 1675 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1676 if (timeo > NFS_MAXTIMEO) 1677 timeo = NFS_MAXTIMEO; 1678 if (rep->r_rtt <= timeo) 1679 continue; 1680 if (nmp->nm_timeouts < 1681 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1682 nmp->nm_timeouts++; 1683 } 1684 /* 1685 * Check for server not responding 1686 */ 1687 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1688 rep->r_rexmit > nmp->nm_deadthresh) { 1689 nfs_msg(rep->r_lwp, 1690 nmp->nm_mountp->mnt_stat.f_mntfromname, 1691 "not responding"); 1692 rep->r_flags |= R_TPRINTFMSG; 1693 } 1694 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1695 nfsstats.rpctimeouts++; 1696 rep->r_flags |= R_SOFTTERM; 1697 continue; 1698 } 1699 if (nmp->nm_sotype != SOCK_DGRAM) { 1700 if (++rep->r_rexmit > NFS_MAXREXMIT) 1701 rep->r_rexmit = NFS_MAXREXMIT; 1702 continue; 1703 } 1704 if ((so = nmp->nm_so) == NULL) 1705 continue; 1706 1707 /* 1708 * If there is enough space and the window allows.. 1709 * Resend it 1710 * Set r_rtt to -1 in case we fail to send it now. 1711 */ 1712 solock(so); 1713 rep->r_rtt = -1; 1714 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1715 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1716 (rep->r_flags & R_SENT) || 1717 nmp->nm_sent < nmp->nm_cwnd) && 1718 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1719 if (so->so_state & SS_ISCONNECTED) 1720 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1721 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 1722 else 1723 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1724 nmp->nm_nam, (struct mbuf *)0, (struct lwp *)0); 1725 if (error) { 1726 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1727 #ifdef DEBUG 1728 if (ratecheck(&nfs_timer_last_err_time, 1729 &nfs_err_interval)) 1730 printf("%s: ignoring error " 1731 "%d\n", __func__, error); 1732 #endif 1733 so->so_error = 0; 1734 } 1735 } else { 1736 /* 1737 * Iff first send, start timing 1738 * else turn timing off, backoff timer 1739 * and divide congestion window by 2. 1740 */ 1741 if (rep->r_flags & R_SENT) { 1742 rep->r_flags &= ~R_TIMING; 1743 if (++rep->r_rexmit > NFS_MAXREXMIT) 1744 rep->r_rexmit = NFS_MAXREXMIT; 1745 nmp->nm_cwnd >>= 1; 1746 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1747 nmp->nm_cwnd = NFS_CWNDSCALE; 1748 nfsstats.rpcretries++; 1749 } else { 1750 rep->r_flags |= R_SENT; 1751 nmp->nm_sent += NFS_CWNDSCALE; 1752 } 1753 rep->r_rtt = 0; 1754 } 1755 } 1756 sounlock(so); 1757 } 1758 splx(s); 1759 1760 mutex_enter(&nfs_timer_lock); 1761 if (nfs_timer_srvvec != NULL) { 1762 more |= (*nfs_timer_srvvec)(); 1763 } 1764 mutex_exit(&nfs_timer_lock); 1765 1766 if (more) { 1767 nfs_timer_schedule(); 1768 } else { 1769 nfs_timer_stop_ev.ev_count++; 1770 } 1771 } 1772 1773 /* 1774 * Test for a termination condition pending on the process. 1775 * This is used for NFSMNT_INT mounts. 1776 */ 1777 int 1778 nfs_sigintr(nmp, rep, l) 1779 struct nfsmount *nmp; 1780 struct nfsreq *rep; 1781 struct lwp *l; 1782 { 1783 sigset_t ss; 1784 1785 if (rep && (rep->r_flags & R_SOFTTERM)) 1786 return (EINTR); 1787 if (!(nmp->nm_flag & NFSMNT_INT)) 1788 return (0); 1789 if (l) { 1790 sigpending1(l, &ss); 1791 #if 0 1792 sigminusset(&l->l_proc->p_sigctx.ps_sigignore, &ss); 1793 #endif 1794 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1795 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1796 sigismember(&ss, SIGQUIT)) 1797 return (EINTR); 1798 } 1799 return (0); 1800 } 1801 1802 #ifdef NFS 1803 /* 1804 * Lock a socket against others. 1805 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1806 * and also to avoid race conditions between the processes with nfs requests 1807 * in progress when a reconnect is necessary. 1808 */ 1809 static int 1810 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) 1811 { 1812 struct lwp *l; 1813 int timeo = 0; 1814 bool catch = false; 1815 int error = 0; 1816 1817 if (rep) { 1818 l = rep->r_lwp; 1819 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1820 catch = true; 1821 } else 1822 l = NULL; 1823 mutex_enter(&nmp->nm_lock); 1824 while ((nmp->nm_iflag & NFSMNT_SNDLOCK) != 0) { 1825 if (rep && nfs_sigintr(rep->r_nmp, rep, l)) { 1826 error = EINTR; 1827 goto quit; 1828 } 1829 if (catch) { 1830 cv_timedwait_sig(&nmp->nm_sndcv, &nmp->nm_lock, timeo); 1831 } else { 1832 cv_timedwait(&nmp->nm_sndcv, &nmp->nm_lock, timeo); 1833 } 1834 if (catch) { 1835 catch = false; 1836 timeo = 2 * hz; 1837 } 1838 } 1839 nmp->nm_iflag |= NFSMNT_SNDLOCK; 1840 quit: 1841 mutex_exit(&nmp->nm_lock); 1842 return error; 1843 } 1844 1845 /* 1846 * Unlock the stream socket for others. 1847 */ 1848 static void 1849 nfs_sndunlock(struct nfsmount *nmp) 1850 { 1851 1852 mutex_enter(&nmp->nm_lock); 1853 if ((nmp->nm_iflag & NFSMNT_SNDLOCK) == 0) 1854 panic("nfs sndunlock"); 1855 nmp->nm_iflag &= ~NFSMNT_SNDLOCK; 1856 cv_signal(&nmp->nm_sndcv); 1857 mutex_exit(&nmp->nm_lock); 1858 } 1859 #endif /* NFS */ 1860 1861 static int 1862 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep) 1863 { 1864 int *flagp = &nmp->nm_iflag; 1865 int slptimeo = 0; 1866 bool catch; 1867 int error = 0; 1868 1869 KASSERT(nmp == rep->r_nmp); 1870 1871 catch = (nmp->nm_flag & NFSMNT_INT) != 0; 1872 mutex_enter(&nmp->nm_lock); 1873 while (/* CONSTCOND */ true) { 1874 if (*flagp & NFSMNT_DISMNT) { 1875 cv_signal(&nmp->nm_disconcv); 1876 error = EIO; 1877 break; 1878 } 1879 /* If our reply was received while we were sleeping, 1880 * then just return without taking the lock to avoid a 1881 * situation where a single iod could 'capture' the 1882 * receive lock. 1883 */ 1884 if (rep->r_mrep != NULL) { 1885 error = EALREADY; 1886 break; 1887 } 1888 if (nfs_sigintr(rep->r_nmp, rep, rep->r_lwp)) { 1889 error = EINTR; 1890 break; 1891 } 1892 if ((*flagp & NFSMNT_RCVLOCK) == 0) { 1893 *flagp |= NFSMNT_RCVLOCK; 1894 break; 1895 } 1896 if (catch) { 1897 cv_timedwait_sig(&nmp->nm_rcvcv, &nmp->nm_lock, 1898 slptimeo); 1899 } else { 1900 cv_timedwait(&nmp->nm_rcvcv, &nmp->nm_lock, 1901 slptimeo); 1902 } 1903 if (catch) { 1904 catch = false; 1905 slptimeo = 2 * hz; 1906 } 1907 } 1908 mutex_exit(&nmp->nm_lock); 1909 return error; 1910 } 1911 1912 /* 1913 * Unlock the stream socket for others. 1914 */ 1915 static void 1916 nfs_rcvunlock(struct nfsmount *nmp) 1917 { 1918 1919 mutex_enter(&nmp->nm_lock); 1920 if ((nmp->nm_iflag & NFSMNT_RCVLOCK) == 0) 1921 panic("nfs rcvunlock"); 1922 nmp->nm_iflag &= ~NFSMNT_RCVLOCK; 1923 cv_broadcast(&nmp->nm_rcvcv); 1924 mutex_exit(&nmp->nm_lock); 1925 } 1926 1927 /* 1928 * Parse an RPC request 1929 * - verify it 1930 * - allocate and fill in the cred. 1931 */ 1932 int 1933 nfs_getreq(nd, nfsd, has_header) 1934 struct nfsrv_descript *nd; 1935 struct nfsd *nfsd; 1936 int has_header; 1937 { 1938 int len, i; 1939 u_int32_t *tl; 1940 int32_t t1; 1941 struct uio uio; 1942 struct iovec iov; 1943 char *dpos, *cp2, *cp; 1944 u_int32_t nfsvers, auth_type; 1945 uid_t nickuid; 1946 int error = 0, ticklen; 1947 struct mbuf *mrep, *md; 1948 struct nfsuid *nuidp; 1949 struct timeval tvin, tvout; 1950 1951 memset(&tvout, 0, sizeof tvout); /* XXX gcc */ 1952 1953 KASSERT(nd->nd_cr == NULL); 1954 mrep = nd->nd_mrep; 1955 md = nd->nd_md; 1956 dpos = nd->nd_dpos; 1957 if (has_header) { 1958 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1959 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1960 if (*tl++ != rpc_call) { 1961 m_freem(mrep); 1962 return (EBADRPC); 1963 } 1964 } else 1965 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1966 nd->nd_repstat = 0; 1967 nd->nd_flag = 0; 1968 if (*tl++ != rpc_vers) { 1969 nd->nd_repstat = ERPCMISMATCH; 1970 nd->nd_procnum = NFSPROC_NOOP; 1971 return (0); 1972 } 1973 if (*tl != nfs_prog) { 1974 nd->nd_repstat = EPROGUNAVAIL; 1975 nd->nd_procnum = NFSPROC_NOOP; 1976 return (0); 1977 } 1978 tl++; 1979 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1980 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 1981 nd->nd_repstat = EPROGMISMATCH; 1982 nd->nd_procnum = NFSPROC_NOOP; 1983 return (0); 1984 } 1985 if (nfsvers == NFS_VER3) 1986 nd->nd_flag = ND_NFSV3; 1987 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1988 if (nd->nd_procnum == NFSPROC_NULL) 1989 return (0); 1990 if (nd->nd_procnum > NFSPROC_COMMIT || 1991 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1992 nd->nd_repstat = EPROCUNAVAIL; 1993 nd->nd_procnum = NFSPROC_NOOP; 1994 return (0); 1995 } 1996 if ((nd->nd_flag & ND_NFSV3) == 0) 1997 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1998 auth_type = *tl++; 1999 len = fxdr_unsigned(int, *tl++); 2000 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2001 m_freem(mrep); 2002 return (EBADRPC); 2003 } 2004 2005 nd->nd_flag &= ~ND_KERBAUTH; 2006 /* 2007 * Handle auth_unix or auth_kerb. 2008 */ 2009 if (auth_type == rpc_auth_unix) { 2010 uid_t uid; 2011 gid_t gid; 2012 2013 nd->nd_cr = kauth_cred_alloc(); 2014 len = fxdr_unsigned(int, *++tl); 2015 if (len < 0 || len > NFS_MAXNAMLEN) { 2016 m_freem(mrep); 2017 error = EBADRPC; 2018 goto errout; 2019 } 2020 nfsm_adv(nfsm_rndup(len)); 2021 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2022 2023 uid = fxdr_unsigned(uid_t, *tl++); 2024 gid = fxdr_unsigned(gid_t, *tl++); 2025 kauth_cred_setuid(nd->nd_cr, uid); 2026 kauth_cred_seteuid(nd->nd_cr, uid); 2027 kauth_cred_setsvuid(nd->nd_cr, uid); 2028 kauth_cred_setgid(nd->nd_cr, gid); 2029 kauth_cred_setegid(nd->nd_cr, gid); 2030 kauth_cred_setsvgid(nd->nd_cr, gid); 2031 2032 len = fxdr_unsigned(int, *tl); 2033 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2034 m_freem(mrep); 2035 error = EBADRPC; 2036 goto errout; 2037 } 2038 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 2039 2040 if (len > 0) { 2041 size_t grbuf_size = min(len, NGROUPS) * sizeof(gid_t); 2042 gid_t *grbuf = kmem_alloc(grbuf_size, KM_SLEEP); 2043 2044 for (i = 0; i < len; i++) { 2045 if (i < NGROUPS) /* XXX elad */ 2046 grbuf[i] = fxdr_unsigned(gid_t, *tl++); 2047 else 2048 tl++; 2049 } 2050 kauth_cred_setgroups(nd->nd_cr, grbuf, 2051 min(len, NGROUPS), -1, UIO_SYSSPACE); 2052 kmem_free(grbuf, grbuf_size); 2053 } 2054 2055 len = fxdr_unsigned(int, *++tl); 2056 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2057 m_freem(mrep); 2058 error = EBADRPC; 2059 goto errout; 2060 } 2061 if (len > 0) 2062 nfsm_adv(nfsm_rndup(len)); 2063 } else if (auth_type == rpc_auth_kerb) { 2064 switch (fxdr_unsigned(int, *tl++)) { 2065 case RPCAKN_FULLNAME: 2066 ticklen = fxdr_unsigned(int, *tl); 2067 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2068 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2069 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2070 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2071 m_freem(mrep); 2072 error = EBADRPC; 2073 goto errout; 2074 } 2075 uio.uio_offset = 0; 2076 uio.uio_iov = &iov; 2077 uio.uio_iovcnt = 1; 2078 UIO_SETUP_SYSSPACE(&uio); 2079 iov.iov_base = (void *)&nfsd->nfsd_authstr[4]; 2080 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2081 nfsm_mtouio(&uio, uio.uio_resid); 2082 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2083 if (*tl++ != rpc_auth_kerb || 2084 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2085 printf("Bad kerb verifier\n"); 2086 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2087 nd->nd_procnum = NFSPROC_NOOP; 2088 return (0); 2089 } 2090 nfsm_dissect(cp, void *, 4 * NFSX_UNSIGNED); 2091 tl = (u_int32_t *)cp; 2092 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2093 printf("Not fullname kerb verifier\n"); 2094 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2095 nd->nd_procnum = NFSPROC_NOOP; 2096 return (0); 2097 } 2098 cp += NFSX_UNSIGNED; 2099 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 2100 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2101 nd->nd_flag |= ND_KERBFULL; 2102 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2103 break; 2104 case RPCAKN_NICKNAME: 2105 if (len != 2 * NFSX_UNSIGNED) { 2106 printf("Kerb nickname short\n"); 2107 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2108 nd->nd_procnum = NFSPROC_NOOP; 2109 return (0); 2110 } 2111 nickuid = fxdr_unsigned(uid_t, *tl); 2112 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2113 if (*tl++ != rpc_auth_kerb || 2114 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2115 printf("Kerb nick verifier bad\n"); 2116 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2117 nd->nd_procnum = NFSPROC_NOOP; 2118 return (0); 2119 } 2120 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2121 tvin.tv_sec = *tl++; 2122 tvin.tv_usec = *tl; 2123 2124 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 2125 nu_hash) { 2126 if (kauth_cred_geteuid(nuidp->nu_cr) == nickuid && 2127 (!nd->nd_nam2 || 2128 netaddr_match(NU_NETFAM(nuidp), 2129 &nuidp->nu_haddr, nd->nd_nam2))) 2130 break; 2131 } 2132 if (!nuidp) { 2133 nd->nd_repstat = 2134 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2135 nd->nd_procnum = NFSPROC_NOOP; 2136 return (0); 2137 } 2138 2139 /* 2140 * Now, decrypt the timestamp using the session key 2141 * and validate it. 2142 */ 2143 #ifdef NFSKERB 2144 XXX 2145 #endif 2146 2147 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2148 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2149 if (nuidp->nu_expire < time_second || 2150 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2151 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2152 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2153 nuidp->nu_expire = 0; 2154 nd->nd_repstat = 2155 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2156 nd->nd_procnum = NFSPROC_NOOP; 2157 return (0); 2158 } 2159 kauth_cred_hold(nuidp->nu_cr); 2160 nd->nd_cr = nuidp->nu_cr; 2161 nd->nd_flag |= ND_KERBNICK; 2162 } 2163 } else { 2164 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2165 nd->nd_procnum = NFSPROC_NOOP; 2166 return (0); 2167 } 2168 2169 nd->nd_md = md; 2170 nd->nd_dpos = dpos; 2171 KASSERT((nd->nd_cr == NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) != 0) 2172 || (nd->nd_cr != NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) == 0)); 2173 return (0); 2174 nfsmout: 2175 errout: 2176 KASSERT(error != 0); 2177 if (nd->nd_cr != NULL) { 2178 kauth_cred_free(nd->nd_cr); 2179 nd->nd_cr = NULL; 2180 } 2181 return (error); 2182 } 2183 2184 int 2185 nfs_msg(l, server, msg) 2186 struct lwp *l; 2187 const char *server, *msg; 2188 { 2189 tpr_t tpr; 2190 2191 if (l) 2192 tpr = tprintf_open(l->l_proc); 2193 else 2194 tpr = NULL; 2195 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2196 tprintf_close(tpr); 2197 return (0); 2198 } 2199 2200 static struct pool nfs_srvdesc_pool; 2201 2202 void 2203 nfsdreq_init(void) 2204 { 2205 2206 pool_init(&nfs_srvdesc_pool, sizeof(struct nfsrv_descript), 2207 0, 0, 0, "nfsrvdescpl", &pool_allocator_nointr, IPL_NONE); 2208 } 2209 2210 void 2211 nfsdreq_fini(void) 2212 { 2213 2214 pool_destroy(&nfs_srvdesc_pool); 2215 } 2216 2217 struct nfsrv_descript * 2218 nfsdreq_alloc(void) 2219 { 2220 struct nfsrv_descript *nd; 2221 2222 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2223 nd->nd_cr = NULL; 2224 return nd; 2225 } 2226 2227 void 2228 nfsdreq_free(struct nfsrv_descript *nd) 2229 { 2230 kauth_cred_t cr; 2231 2232 cr = nd->nd_cr; 2233 if (cr != NULL) { 2234 kauth_cred_free(cr); 2235 } 2236 pool_put(&nfs_srvdesc_pool, nd); 2237 } 2238
Indexes created Mon Sep 22 05:09:51 GMT 2025