nfs_socket.c revision 1.181
1 /* $NetBSD: nfs_socket.c,v 1.181 2009/10/16 23:36:05 pooka 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 1.181 2009/10/16 23:36:05 pooka 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(struct nfsmount *nmp, struct nfsreq *rep, struct lwp *l) 200 { 201 struct socket *so; 202 int error, rcvreserve, sndreserve; 203 struct sockaddr *saddr; 204 struct sockaddr_in *sin; 205 struct sockaddr_in6 *sin6; 206 struct mbuf *m; 207 int val; 208 209 nmp->nm_so = (struct socket *)0; 210 saddr = mtod(nmp->nm_nam, struct sockaddr *); 211 error = socreate(saddr->sa_family, &nmp->nm_so, 212 nmp->nm_sotype, nmp->nm_soproto, l, NULL); 213 if (error) 214 goto bad; 215 so = nmp->nm_so; 216 #ifdef MBUFTRACE 217 so->so_mowner = &nfs_mowner; 218 so->so_rcv.sb_mowner = &nfs_mowner; 219 so->so_snd.sb_mowner = &nfs_mowner; 220 #endif 221 nmp->nm_soflags = so->so_proto->pr_flags; 222 223 /* 224 * Some servers require that the client port be a reserved port number. 225 */ 226 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 227 val = IP_PORTRANGE_LOW; 228 229 if ((error = so_setsockopt(NULL, so, IPPROTO_IP, IP_PORTRANGE, 230 &val, sizeof(val)))) 231 goto bad; 232 m = m_get(M_WAIT, MT_SONAME); 233 MCLAIM(m, so->so_mowner); 234 sin = mtod(m, struct sockaddr_in *); 235 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 236 sin->sin_family = AF_INET; 237 sin->sin_addr.s_addr = INADDR_ANY; 238 sin->sin_port = 0; 239 error = sobind(so, m, &lwp0); 240 m_freem(m); 241 if (error) 242 goto bad; 243 } 244 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 245 val = IPV6_PORTRANGE_LOW; 246 247 if ((error = so_setsockopt(NULL, so, IPPROTO_IPV6, 248 IPV6_PORTRANGE, &val, sizeof(val)))) 249 goto bad; 250 m = m_get(M_WAIT, MT_SONAME); 251 MCLAIM(m, so->so_mowner); 252 sin6 = mtod(m, struct sockaddr_in6 *); 253 memset(sin6, 0, sizeof(*sin6)); 254 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 255 sin6->sin6_family = AF_INET6; 256 error = sobind(so, m, &lwp0); 257 m_freem(m); 258 if (error) 259 goto bad; 260 } 261 262 /* 263 * Protocols that do not require connections may be optionally left 264 * unconnected for servers that reply from a port other than NFS_PORT. 265 */ 266 solock(so); 267 if (nmp->nm_flag & NFSMNT_NOCONN) { 268 if (nmp->nm_soflags & PR_CONNREQUIRED) { 269 sounlock(so); 270 error = ENOTCONN; 271 goto bad; 272 } 273 } else { 274 error = soconnect(so, nmp->nm_nam, l); 275 if (error) { 276 sounlock(so); 277 goto bad; 278 } 279 280 /* 281 * Wait for the connection to complete. Cribbed from the 282 * connect system call but with the wait timing out so 283 * that interruptible mounts don't hang here for a long time. 284 */ 285 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 286 (void)sowait(so, false, 2 * hz); 287 if ((so->so_state & SS_ISCONNECTING) && 288 so->so_error == 0 && rep && 289 (error = nfs_sigintr(nmp, rep, rep->r_lwp)) != 0){ 290 so->so_state &= ~SS_ISCONNECTING; 291 sounlock(so); 292 goto bad; 293 } 294 } 295 if (so->so_error) { 296 error = so->so_error; 297 so->so_error = 0; 298 sounlock(so); 299 goto bad; 300 } 301 } 302 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 303 so->so_rcv.sb_timeo = (5 * hz); 304 so->so_snd.sb_timeo = (5 * hz); 305 } else { 306 /* 307 * enable receive timeout to detect server crash and reconnect. 308 * otherwise, we can be stuck in soreceive forever. 309 */ 310 so->so_rcv.sb_timeo = (5 * hz); 311 so->so_snd.sb_timeo = 0; 312 } 313 if (nmp->nm_sotype == SOCK_DGRAM) { 314 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 315 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 316 NFS_MAXPKTHDR) * 2; 317 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 318 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 319 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 320 NFS_MAXPKTHDR) * 2; 321 } else { 322 sounlock(so); 323 if (nmp->nm_sotype != SOCK_STREAM) 324 panic("nfscon sotype"); 325 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 326 val = 1; 327 so_setsockopt(NULL, so, SOL_SOCKET, SO_KEEPALIVE, &val, 328 sizeof(val)); 329 } 330 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 331 val = 1; 332 so_setsockopt(NULL, so, IPPROTO_TCP, TCP_NODELAY, &val, 333 sizeof(val)); 334 } 335 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 336 sizeof (u_int32_t)) * 2; 337 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 338 sizeof (u_int32_t)) * 2; 339 solock(so); 340 } 341 error = soreserve(so, sndreserve, rcvreserve); 342 if (error) { 343 sounlock(so); 344 goto bad; 345 } 346 so->so_rcv.sb_flags |= SB_NOINTR; 347 so->so_snd.sb_flags |= SB_NOINTR; 348 sounlock(so); 349 350 /* Initialize other non-zero congestion variables */ 351 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 352 NFS_TIMEO << 3; 353 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 354 nmp->nm_sdrtt[3] = 0; 355 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 356 nmp->nm_sent = 0; 357 nmp->nm_timeouts = 0; 358 return (0); 359 360 bad: 361 nfs_disconnect(nmp); 362 return (error); 363 } 364 365 /* 366 * Reconnect routine: 367 * Called when a connection is broken on a reliable protocol. 368 * - clean up the old socket 369 * - nfs_connect() again 370 * - set R_MUSTRESEND for all outstanding requests on mount point 371 * If this fails the mount point is DEAD! 372 * nb: Must be called with the nfs_sndlock() set on the mount point. 373 */ 374 int 375 nfs_reconnect(struct nfsreq *rep) 376 { 377 struct nfsreq *rp; 378 struct nfsmount *nmp = rep->r_nmp; 379 int error; 380 381 nfs_disconnect(nmp); 382 while ((error = nfs_connect(nmp, rep, &lwp0)) != 0) { 383 if (error == EINTR || error == ERESTART) 384 return (EINTR); 385 kpause("nfscn2", false, hz, NULL); 386 } 387 388 /* 389 * Loop through outstanding request list and fix up all requests 390 * on old socket. 391 */ 392 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 393 if (rp->r_nmp == nmp) { 394 if ((rp->r_flags & R_MUSTRESEND) == 0) 395 rp->r_flags |= R_MUSTRESEND | R_REXMITTED; 396 rp->r_rexmit = 0; 397 } 398 } 399 return (0); 400 } 401 402 /* 403 * NFS disconnect. Clean up and unlink. 404 */ 405 void 406 nfs_disconnect(struct nfsmount *nmp) 407 { 408 struct socket *so; 409 int drain = 0; 410 411 if (nmp->nm_so) { 412 so = nmp->nm_so; 413 nmp->nm_so = (struct socket *)0; 414 solock(so); 415 soshutdown(so, SHUT_RDWR); 416 sounlock(so); 417 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 418 if (drain) { 419 /* 420 * soshutdown() above should wake up the current 421 * listener. 422 * Now wake up those waiting for the receive lock, and 423 * wait for them to go away unhappy, to prevent *nmp 424 * from evaporating while they're sleeping. 425 */ 426 mutex_enter(&nmp->nm_lock); 427 while (nmp->nm_waiters > 0) { 428 cv_broadcast(&nmp->nm_rcvcv); 429 cv_broadcast(&nmp->nm_sndcv); 430 cv_wait(&nmp->nm_disconcv, &nmp->nm_lock); 431 } 432 mutex_exit(&nmp->nm_lock); 433 } 434 soclose(so); 435 } 436 #ifdef DIAGNOSTIC 437 if (drain && (nmp->nm_waiters > 0)) 438 panic("nfs_disconnect: waiters left after drain?"); 439 #endif 440 } 441 442 void 443 nfs_safedisconnect(struct nfsmount *nmp) 444 { 445 struct nfsreq dummyreq; 446 447 memset(&dummyreq, 0, sizeof(dummyreq)); 448 dummyreq.r_nmp = nmp; 449 nfs_rcvlock(nmp, &dummyreq); /* XXX ignored error return */ 450 nfs_disconnect(nmp); 451 nfs_rcvunlock(nmp); 452 } 453 454 /* 455 * This is the nfs send routine. For connection based socket types, it 456 * must be called with an nfs_sndlock() on the socket. 457 * "rep == NULL" indicates that it has been called from a server. 458 * For the client side: 459 * - return EINTR if the RPC is terminated, 0 otherwise 460 * - set R_MUSTRESEND if the send fails for any reason 461 * - do any cleanup required by recoverable socket errors (? ? ?) 462 * For the server side: 463 * - return EINTR or ERESTART if interrupted by a signal 464 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 465 * - do any cleanup required by recoverable socket errors (? ? ?) 466 */ 467 int 468 nfs_send(struct socket *so, struct mbuf *nam, struct mbuf *top, struct nfsreq *rep, struct lwp *l) 469 { 470 struct mbuf *sendnam; 471 int error, soflags, flags; 472 473 /* XXX nfs_doio()/nfs_request() calls with rep->r_lwp == NULL */ 474 if (l == NULL && rep->r_lwp == NULL) 475 l = curlwp; 476 477 if (rep) { 478 if (rep->r_flags & R_SOFTTERM) { 479 m_freem(top); 480 return (EINTR); 481 } 482 if ((so = rep->r_nmp->nm_so) == NULL) { 483 rep->r_flags |= R_MUSTRESEND; 484 m_freem(top); 485 return (0); 486 } 487 rep->r_flags &= ~R_MUSTRESEND; 488 soflags = rep->r_nmp->nm_soflags; 489 } else 490 soflags = so->so_proto->pr_flags; 491 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 492 sendnam = (struct mbuf *)0; 493 else 494 sendnam = nam; 495 if (so->so_type == SOCK_SEQPACKET) 496 flags = MSG_EOR; 497 else 498 flags = 0; 499 500 error = (*so->so_send)(so, sendnam, NULL, top, NULL, flags, l); 501 if (error) { 502 if (rep) { 503 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 504 /* 505 * We're too fast for the network/driver, 506 * and UDP isn't flowcontrolled. 507 * We need to resend. This is not fatal, 508 * just try again. 509 * 510 * Could be smarter here by doing some sort 511 * of a backoff, but this is rare. 512 */ 513 rep->r_flags |= R_MUSTRESEND; 514 } else { 515 if (error != EPIPE) 516 log(LOG_INFO, 517 "nfs send error %d for %s\n", 518 error, 519 rep->r_nmp->nm_mountp-> 520 mnt_stat.f_mntfromname); 521 /* 522 * Deal with errors for the client side. 523 */ 524 if (rep->r_flags & R_SOFTTERM) 525 error = EINTR; 526 else if (error != EMSGSIZE) 527 rep->r_flags |= R_MUSTRESEND; 528 } 529 } else { 530 /* 531 * See above. This error can happen under normal 532 * circumstances and the log is too noisy. 533 * The error will still show up in nfsstat. 534 */ 535 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 536 log(LOG_INFO, "nfsd send error %d\n", error); 537 } 538 539 /* 540 * Handle any recoverable (soft) socket errors here. (? ? ?) 541 */ 542 if (error != EINTR && error != ERESTART && 543 error != EWOULDBLOCK && error != EPIPE && 544 error != EMSGSIZE) 545 error = 0; 546 } 547 return (error); 548 } 549 550 #ifdef NFS 551 /* 552 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 553 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 554 * Mark and consolidate the data into a new mbuf list. 555 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 556 * small mbufs. 557 * For SOCK_STREAM we must be very careful to read an entire record once 558 * we have read any of it, even if the system call has been interrupted. 559 */ 560 static int 561 nfs_receive(struct nfsreq *rep, struct mbuf **aname, struct mbuf **mp, 562 struct lwp *l) 563 { 564 struct socket *so; 565 struct uio auio; 566 struct iovec aio; 567 struct mbuf *m; 568 struct mbuf *control; 569 u_int32_t len; 570 struct mbuf **getnam; 571 int error, sotype, rcvflg; 572 573 /* 574 * Set up arguments for soreceive() 575 */ 576 *mp = (struct mbuf *)0; 577 *aname = (struct mbuf *)0; 578 sotype = rep->r_nmp->nm_sotype; 579 580 /* 581 * For reliable protocols, lock against other senders/receivers 582 * in case a reconnect is necessary. 583 * For SOCK_STREAM, first get the Record Mark to find out how much 584 * more there is to get. 585 * We must lock the socket against other receivers 586 * until we have an entire rpc request/reply. 587 */ 588 if (sotype != SOCK_DGRAM) { 589 error = nfs_sndlock(rep->r_nmp, rep); 590 if (error) 591 return (error); 592 tryagain: 593 /* 594 * Check for fatal errors and resending request. 595 */ 596 /* 597 * Ugh: If a reconnect attempt just happened, nm_so 598 * would have changed. NULL indicates a failed 599 * attempt that has essentially shut down this 600 * mount point. 601 */ 602 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 603 nfs_sndunlock(rep->r_nmp); 604 return (EINTR); 605 } 606 so = rep->r_nmp->nm_so; 607 if (!so) { 608 error = nfs_reconnect(rep); 609 if (error) { 610 nfs_sndunlock(rep->r_nmp); 611 return (error); 612 } 613 goto tryagain; 614 } 615 while (rep->r_flags & R_MUSTRESEND) { 616 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 617 nfsstats.rpcretries++; 618 rep->r_rtt = 0; 619 rep->r_flags &= ~R_TIMING; 620 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, l); 621 if (error) { 622 if (error == EINTR || error == ERESTART || 623 (error = nfs_reconnect(rep)) != 0) { 624 nfs_sndunlock(rep->r_nmp); 625 return (error); 626 } 627 goto tryagain; 628 } 629 } 630 nfs_sndunlock(rep->r_nmp); 631 if (sotype == SOCK_STREAM) { 632 aio.iov_base = (void *) &len; 633 aio.iov_len = sizeof(u_int32_t); 634 auio.uio_iov = &aio; 635 auio.uio_iovcnt = 1; 636 auio.uio_rw = UIO_READ; 637 auio.uio_offset = 0; 638 auio.uio_resid = sizeof(u_int32_t); 639 UIO_SETUP_SYSSPACE(&auio); 640 do { 641 rcvflg = MSG_WAITALL; 642 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 643 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 644 if (error == EWOULDBLOCK && rep) { 645 if (rep->r_flags & R_SOFTTERM) 646 return (EINTR); 647 /* 648 * if it seems that the server died after it 649 * received our request, set EPIPE so that 650 * we'll reconnect and retransmit requests. 651 */ 652 if (rep->r_rexmit >= rep->r_nmp->nm_retry) { 653 nfsstats.rpctimeouts++; 654 error = EPIPE; 655 } 656 } 657 } while (error == EWOULDBLOCK); 658 if (!error && auio.uio_resid > 0) { 659 /* 660 * Don't log a 0 byte receive; it means 661 * that the socket has been closed, and 662 * can happen during normal operation 663 * (forcible unmount or Solaris server). 664 */ 665 if (auio.uio_resid != sizeof (u_int32_t)) 666 log(LOG_INFO, 667 "short receive (%lu/%lu) from nfs server %s\n", 668 (u_long)sizeof(u_int32_t) - auio.uio_resid, 669 (u_long)sizeof(u_int32_t), 670 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 671 error = EPIPE; 672 } 673 if (error) 674 goto errout; 675 len = ntohl(len) & ~0x80000000; 676 /* 677 * This is SERIOUS! We are out of sync with the sender 678 * and forcing a disconnect/reconnect is all I can do. 679 */ 680 if (len > NFS_MAXPACKET) { 681 log(LOG_ERR, "%s (%d) from nfs server %s\n", 682 "impossible packet length", 683 len, 684 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 685 error = EFBIG; 686 goto errout; 687 } 688 auio.uio_resid = len; 689 do { 690 rcvflg = MSG_WAITALL; 691 error = (*so->so_receive)(so, (struct mbuf **)0, 692 &auio, mp, (struct mbuf **)0, &rcvflg); 693 } while (error == EWOULDBLOCK || error == EINTR || 694 error == ERESTART); 695 if (!error && auio.uio_resid > 0) { 696 if (len != auio.uio_resid) 697 log(LOG_INFO, 698 "short receive (%lu/%d) from nfs server %s\n", 699 (u_long)len - auio.uio_resid, len, 700 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 701 error = EPIPE; 702 } 703 } else { 704 /* 705 * NB: Since uio_resid is big, MSG_WAITALL is ignored 706 * and soreceive() will return when it has either a 707 * control msg or a data msg. 708 * We have no use for control msg., but must grab them 709 * and then throw them away so we know what is going 710 * on. 711 */ 712 auio.uio_resid = len = 100000000; /* Anything Big */ 713 /* not need to setup uio_vmspace */ 714 do { 715 rcvflg = 0; 716 error = (*so->so_receive)(so, (struct mbuf **)0, 717 &auio, mp, &control, &rcvflg); 718 if (control) 719 m_freem(control); 720 if (error == EWOULDBLOCK && rep) { 721 if (rep->r_flags & R_SOFTTERM) 722 return (EINTR); 723 } 724 } while (error == EWOULDBLOCK || 725 (!error && *mp == NULL && control)); 726 if ((rcvflg & MSG_EOR) == 0) 727 printf("Egad!!\n"); 728 if (!error && *mp == NULL) 729 error = EPIPE; 730 len -= auio.uio_resid; 731 } 732 errout: 733 if (error && error != EINTR && error != ERESTART) { 734 m_freem(*mp); 735 *mp = (struct mbuf *)0; 736 if (error != EPIPE) 737 log(LOG_INFO, 738 "receive error %d from nfs server %s\n", 739 error, 740 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 741 error = nfs_sndlock(rep->r_nmp, rep); 742 if (!error) 743 error = nfs_reconnect(rep); 744 if (!error) 745 goto tryagain; 746 else 747 nfs_sndunlock(rep->r_nmp); 748 } 749 } else { 750 if ((so = rep->r_nmp->nm_so) == NULL) 751 return (EACCES); 752 if (so->so_state & SS_ISCONNECTED) 753 getnam = (struct mbuf **)0; 754 else 755 getnam = aname; 756 auio.uio_resid = len = 1000000; 757 /* not need to setup uio_vmspace */ 758 do { 759 rcvflg = 0; 760 error = (*so->so_receive)(so, getnam, &auio, mp, 761 (struct mbuf **)0, &rcvflg); 762 if (error == EWOULDBLOCK && 763 (rep->r_flags & R_SOFTTERM)) 764 return (EINTR); 765 } while (error == EWOULDBLOCK); 766 len -= auio.uio_resid; 767 if (!error && *mp == NULL) 768 error = EPIPE; 769 } 770 if (error) { 771 m_freem(*mp); 772 *mp = (struct mbuf *)0; 773 } 774 return (error); 775 } 776 777 /* 778 * Implement receipt of reply on a socket. 779 * We must search through the list of received datagrams matching them 780 * with outstanding requests using the xid, until ours is found. 781 */ 782 /* ARGSUSED */ 783 static int 784 nfs_reply(struct nfsreq *myrep, struct lwp *lwp) 785 { 786 struct nfsreq *rep; 787 struct nfsmount *nmp = myrep->r_nmp; 788 int32_t t1; 789 struct mbuf *mrep, *nam, *md; 790 u_int32_t rxid, *tl; 791 char *dpos, *cp2; 792 int error; 793 794 /* 795 * Loop around until we get our own reply 796 */ 797 for (;;) { 798 /* 799 * Lock against other receivers so that I don't get stuck in 800 * sbwait() after someone else has received my reply for me. 801 * Also necessary for connection based protocols to avoid 802 * race conditions during a reconnect. 803 */ 804 error = nfs_rcvlock(nmp, myrep); 805 if (error == EALREADY) 806 return (0); 807 if (error) 808 return (error); 809 /* 810 * Get the next Rpc reply off the socket 811 */ 812 813 mutex_enter(&nmp->nm_lock); 814 nmp->nm_waiters++; 815 mutex_exit(&nmp->nm_lock); 816 817 error = nfs_receive(myrep, &nam, &mrep, lwp); 818 819 mutex_enter(&nmp->nm_lock); 820 nmp->nm_waiters--; 821 cv_signal(&nmp->nm_disconcv); 822 mutex_exit(&nmp->nm_lock); 823 824 if (error) { 825 nfs_rcvunlock(nmp); 826 827 if (nmp->nm_iflag & NFSMNT_DISMNT) { 828 /* 829 * Oops, we're going away now.. 830 */ 831 return error; 832 } 833 /* 834 * Ignore routing errors on connectionless protocols? ? 835 */ 836 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 837 nmp->nm_so->so_error = 0; 838 #ifdef DEBUG 839 if (ratecheck(&nfs_reply_last_err_time, 840 &nfs_err_interval)) 841 printf("%s: ignoring error %d\n", 842 __func__, error); 843 #endif 844 continue; 845 } 846 return (error); 847 } 848 if (nam) 849 m_freem(nam); 850 851 /* 852 * Get the xid and check that it is an rpc reply 853 */ 854 md = mrep; 855 dpos = mtod(md, void *); 856 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 857 rxid = *tl++; 858 if (*tl != rpc_reply) { 859 nfsstats.rpcinvalid++; 860 m_freem(mrep); 861 nfsmout: 862 nfs_rcvunlock(nmp); 863 continue; 864 } 865 866 /* 867 * Loop through the request list to match up the reply 868 * Iff no match, just drop the datagram 869 */ 870 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 871 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 872 /* Found it.. */ 873 rep->r_mrep = mrep; 874 rep->r_md = md; 875 rep->r_dpos = dpos; 876 if (nfsrtton) { 877 struct rttl *rt; 878 879 rt = &nfsrtt.rttl[nfsrtt.pos]; 880 rt->proc = rep->r_procnum; 881 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 882 rt->sent = nmp->nm_sent; 883 rt->cwnd = nmp->nm_cwnd; 884 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 885 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 886 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; 887 getmicrotime(&rt->tstamp); 888 if (rep->r_flags & R_TIMING) 889 rt->rtt = rep->r_rtt; 890 else 891 rt->rtt = 1000000; 892 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 893 } 894 /* 895 * Update congestion window. 896 * Do the additive increase of 897 * one rpc/rtt. 898 */ 899 if (nmp->nm_cwnd <= nmp->nm_sent) { 900 nmp->nm_cwnd += 901 (NFS_CWNDSCALE * NFS_CWNDSCALE + 902 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 903 if (nmp->nm_cwnd > NFS_MAXCWND) 904 nmp->nm_cwnd = NFS_MAXCWND; 905 } 906 rep->r_flags &= ~R_SENT; 907 nmp->nm_sent -= NFS_CWNDSCALE; 908 /* 909 * Update rtt using a gain of 0.125 on the mean 910 * and a gain of 0.25 on the deviation. 911 */ 912 if (rep->r_flags & R_TIMING) { 913 /* 914 * Since the timer resolution of 915 * NFS_HZ is so course, it can often 916 * result in r_rtt == 0. Since 917 * r_rtt == N means that the actual 918 * rtt is between N+dt and N+2-dt ticks, 919 * add 1. 920 */ 921 t1 = rep->r_rtt + 1; 922 t1 -= (NFS_SRTT(rep) >> 3); 923 NFS_SRTT(rep) += t1; 924 if (t1 < 0) 925 t1 = -t1; 926 t1 -= (NFS_SDRTT(rep) >> 2); 927 NFS_SDRTT(rep) += t1; 928 } 929 nmp->nm_timeouts = 0; 930 break; 931 } 932 } 933 nfs_rcvunlock(nmp); 934 /* 935 * If not matched to a request, drop it. 936 * If it's mine, get out. 937 */ 938 if (rep == 0) { 939 nfsstats.rpcunexpected++; 940 m_freem(mrep); 941 } else if (rep == myrep) { 942 if (rep->r_mrep == NULL) 943 panic("nfsreply nil"); 944 return (0); 945 } 946 } 947 } 948 949 /* 950 * nfs_request - goes something like this 951 * - fill in request struct 952 * - links it into list 953 * - calls nfs_send() for first transmit 954 * - calls nfs_receive() to get reply 955 * - break down rpc header and return with nfs reply pointed to 956 * by mrep or error 957 * nb: always frees up mreq mbuf list 958 */ 959 int 960 nfs_request(struct nfsnode *np, struct mbuf *mrest, int procnum, struct lwp *lwp, kauth_cred_t cred, struct mbuf **mrp, struct mbuf **mdp, char **dposp, int *rexmitp) 961 { 962 struct mbuf *m, *mrep; 963 struct nfsreq *rep; 964 u_int32_t *tl; 965 int i; 966 struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); 967 struct mbuf *md, *mheadend; 968 char nickv[RPCX_NICKVERF]; 969 time_t waituntil; 970 char *dpos, *cp2; 971 int t1, s, error = 0, mrest_len, auth_len, auth_type; 972 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 973 int verf_len, verf_type; 974 u_int32_t xid; 975 char *auth_str, *verf_str; 976 NFSKERBKEY_T key; /* save session key */ 977 kauth_cred_t acred; 978 struct mbuf *mrest_backup = NULL; 979 kauth_cred_t origcred = NULL; /* XXX: gcc */ 980 bool retry_cred = true; 981 bool use_opencred = (np->n_flag & NUSEOPENCRED) != 0; 982 983 if (rexmitp != NULL) 984 *rexmitp = 0; 985 986 acred = kauth_cred_alloc(); 987 988 tryagain_cred: 989 KASSERT(cred != NULL); 990 rep = kmem_alloc(sizeof(*rep), KM_SLEEP); 991 rep->r_nmp = nmp; 992 KASSERT(lwp == NULL || lwp == curlwp); 993 rep->r_lwp = lwp; 994 rep->r_procnum = procnum; 995 i = 0; 996 m = mrest; 997 while (m) { 998 i += m->m_len; 999 m = m->m_next; 1000 } 1001 mrest_len = i; 1002 1003 /* 1004 * Get the RPC header with authorization. 1005 */ 1006 kerbauth: 1007 verf_str = auth_str = (char *)0; 1008 if (nmp->nm_flag & NFSMNT_KERB) { 1009 verf_str = nickv; 1010 verf_len = sizeof (nickv); 1011 auth_type = RPCAUTH_KERB4; 1012 memset((void *)key, 0, sizeof (key)); 1013 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 1014 &auth_len, verf_str, verf_len)) { 1015 error = nfs_getauth(nmp, rep, cred, &auth_str, 1016 &auth_len, verf_str, &verf_len, key); 1017 if (error) { 1018 kmem_free(rep, sizeof(*rep)); 1019 m_freem(mrest); 1020 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1021 kauth_cred_free(acred); 1022 return (error); 1023 } 1024 } 1025 retry_cred = false; 1026 } else { 1027 /* AUTH_UNIX */ 1028 uid_t uid; 1029 gid_t gid; 1030 1031 /* 1032 * on the most unix filesystems, permission checks are 1033 * done when the file is open(2)'ed. 1034 * ie. once a file is successfully open'ed, 1035 * following i/o operations never fail with EACCES. 1036 * we try to follow the semantics as far as possible. 1037 * 1038 * note that we expect that the nfs server always grant 1039 * accesses by the file's owner. 1040 */ 1041 origcred = cred; 1042 switch (procnum) { 1043 case NFSPROC_READ: 1044 case NFSPROC_WRITE: 1045 case NFSPROC_COMMIT: 1046 uid = np->n_vattr->va_uid; 1047 gid = np->n_vattr->va_gid; 1048 if (kauth_cred_geteuid(cred) == uid && 1049 kauth_cred_getegid(cred) == gid) { 1050 retry_cred = false; 1051 break; 1052 } 1053 if (use_opencred) 1054 break; 1055 kauth_cred_setuid(acred, uid); 1056 kauth_cred_seteuid(acred, uid); 1057 kauth_cred_setsvuid(acred, uid); 1058 kauth_cred_setgid(acred, gid); 1059 kauth_cred_setegid(acred, gid); 1060 kauth_cred_setsvgid(acred, gid); 1061 cred = acred; 1062 break; 1063 default: 1064 retry_cred = false; 1065 break; 1066 } 1067 /* 1068 * backup mbuf chain if we can need it later to retry. 1069 * 1070 * XXX maybe we can keep a direct reference to 1071 * mrest without doing m_copym, but it's ...ugly. 1072 */ 1073 if (retry_cred) 1074 mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); 1075 auth_type = RPCAUTH_UNIX; 1076 /* XXX elad - ngroups */ 1077 auth_len = (((kauth_cred_ngroups(cred) > nmp->nm_numgrps) ? 1078 nmp->nm_numgrps : kauth_cred_ngroups(cred)) << 2) + 1079 5 * NFSX_UNSIGNED; 1080 } 1081 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1082 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1083 if (auth_str) 1084 free(auth_str, M_TEMP); 1085 1086 /* 1087 * For stream protocols, insert a Sun RPC Record Mark. 1088 */ 1089 if (nmp->nm_sotype == SOCK_STREAM) { 1090 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1091 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1092 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1093 } 1094 rep->r_mreq = m; 1095 rep->r_xid = xid; 1096 tryagain: 1097 if (nmp->nm_flag & NFSMNT_SOFT) 1098 rep->r_retry = nmp->nm_retry; 1099 else 1100 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1101 rep->r_rtt = rep->r_rexmit = 0; 1102 if (proct[procnum] > 0) 1103 rep->r_flags = R_TIMING; 1104 else 1105 rep->r_flags = 0; 1106 rep->r_mrep = NULL; 1107 1108 /* 1109 * Do the client side RPC. 1110 */ 1111 nfsstats.rpcrequests++; 1112 /* 1113 * Chain request into list of outstanding requests. Be sure 1114 * to put it LAST so timer finds oldest requests first. 1115 */ 1116 s = splsoftnet(); 1117 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1118 nfs_timer_start(); 1119 1120 /* 1121 * If backing off another request or avoiding congestion, don't 1122 * send this one now but let timer do it. If not timing a request, 1123 * do it now. 1124 */ 1125 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1126 (nmp->nm_flag & NFSMNT_DUMBTIMR) || nmp->nm_sent < nmp->nm_cwnd)) { 1127 splx(s); 1128 if (nmp->nm_soflags & PR_CONNREQUIRED) 1129 error = nfs_sndlock(nmp, rep); 1130 if (!error) { 1131 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1132 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, lwp); 1133 if (nmp->nm_soflags & PR_CONNREQUIRED) 1134 nfs_sndunlock(nmp); 1135 } 1136 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1137 nmp->nm_sent += NFS_CWNDSCALE; 1138 rep->r_flags |= R_SENT; 1139 } 1140 } else { 1141 splx(s); 1142 rep->r_rtt = -1; 1143 } 1144 1145 /* 1146 * Wait for the reply from our send or the timer's. 1147 */ 1148 if (!error || error == EPIPE) 1149 error = nfs_reply(rep, lwp); 1150 1151 /* 1152 * RPC done, unlink the request. 1153 */ 1154 s = splsoftnet(); 1155 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1156 splx(s); 1157 1158 /* 1159 * Decrement the outstanding request count. 1160 */ 1161 if (rep->r_flags & R_SENT) { 1162 rep->r_flags &= ~R_SENT; /* paranoia */ 1163 nmp->nm_sent -= NFS_CWNDSCALE; 1164 } 1165 1166 if (rexmitp != NULL) { 1167 int rexmit; 1168 1169 if (nmp->nm_sotype != SOCK_DGRAM) 1170 rexmit = (rep->r_flags & R_REXMITTED) != 0; 1171 else 1172 rexmit = rep->r_rexmit; 1173 *rexmitp = rexmit; 1174 } 1175 1176 /* 1177 * If there was a successful reply and a tprintf msg. 1178 * tprintf a response. 1179 */ 1180 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1181 nfs_msg(rep->r_lwp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1182 "is alive again"); 1183 mrep = rep->r_mrep; 1184 md = rep->r_md; 1185 dpos = rep->r_dpos; 1186 if (error) 1187 goto nfsmout; 1188 1189 /* 1190 * break down the rpc header and check if ok 1191 */ 1192 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1193 if (*tl++ == rpc_msgdenied) { 1194 if (*tl == rpc_mismatch) 1195 error = EOPNOTSUPP; 1196 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1197 if (!failed_auth) { 1198 failed_auth++; 1199 mheadend->m_next = (struct mbuf *)0; 1200 m_freem(mrep); 1201 m_freem(rep->r_mreq); 1202 goto kerbauth; 1203 } else 1204 error = EAUTH; 1205 } else 1206 error = EACCES; 1207 m_freem(mrep); 1208 goto nfsmout; 1209 } 1210 1211 /* 1212 * Grab any Kerberos verifier, otherwise just throw it away. 1213 */ 1214 verf_type = fxdr_unsigned(int, *tl++); 1215 i = fxdr_unsigned(int32_t, *tl); 1216 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1217 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1218 if (error) 1219 goto nfsmout; 1220 } else if (i > 0) 1221 nfsm_adv(nfsm_rndup(i)); 1222 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1223 /* 0 == ok */ 1224 if (*tl == 0) { 1225 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1226 if (*tl != 0) { 1227 error = fxdr_unsigned(int, *tl); 1228 switch (error) { 1229 case NFSERR_PERM: 1230 error = EPERM; 1231 break; 1232 1233 case NFSERR_NOENT: 1234 error = ENOENT; 1235 break; 1236 1237 case NFSERR_IO: 1238 error = EIO; 1239 break; 1240 1241 case NFSERR_NXIO: 1242 error = ENXIO; 1243 break; 1244 1245 case NFSERR_ACCES: 1246 error = EACCES; 1247 if (!retry_cred) 1248 break; 1249 m_freem(mrep); 1250 m_freem(rep->r_mreq); 1251 kmem_free(rep, sizeof(*rep)); 1252 use_opencred = !use_opencred; 1253 if (mrest_backup == NULL) { 1254 /* m_copym failure */ 1255 KASSERT( 1256 kauth_cred_getrefcnt(acred) == 1); 1257 kauth_cred_free(acred); 1258 return ENOMEM; 1259 } 1260 mrest = mrest_backup; 1261 mrest_backup = NULL; 1262 cred = origcred; 1263 error = 0; 1264 retry_cred = false; 1265 goto tryagain_cred; 1266 1267 case NFSERR_EXIST: 1268 error = EEXIST; 1269 break; 1270 1271 case NFSERR_XDEV: 1272 error = EXDEV; 1273 break; 1274 1275 case NFSERR_NODEV: 1276 error = ENODEV; 1277 break; 1278 1279 case NFSERR_NOTDIR: 1280 error = ENOTDIR; 1281 break; 1282 1283 case NFSERR_ISDIR: 1284 error = EISDIR; 1285 break; 1286 1287 case NFSERR_INVAL: 1288 error = EINVAL; 1289 break; 1290 1291 case NFSERR_FBIG: 1292 error = EFBIG; 1293 break; 1294 1295 case NFSERR_NOSPC: 1296 error = ENOSPC; 1297 break; 1298 1299 case NFSERR_ROFS: 1300 error = EROFS; 1301 break; 1302 1303 case NFSERR_MLINK: 1304 error = EMLINK; 1305 break; 1306 1307 case NFSERR_TIMEDOUT: 1308 error = ETIMEDOUT; 1309 break; 1310 1311 case NFSERR_NAMETOL: 1312 error = ENAMETOOLONG; 1313 break; 1314 1315 case NFSERR_NOTEMPTY: 1316 error = ENOTEMPTY; 1317 break; 1318 1319 case NFSERR_DQUOT: 1320 error = EDQUOT; 1321 break; 1322 1323 case NFSERR_STALE: 1324 /* 1325 * If the File Handle was stale, invalidate the 1326 * lookup cache, just in case. 1327 */ 1328 error = ESTALE; 1329 cache_purge(NFSTOV(np)); 1330 break; 1331 1332 case NFSERR_REMOTE: 1333 error = EREMOTE; 1334 break; 1335 1336 case NFSERR_WFLUSH: 1337 case NFSERR_BADHANDLE: 1338 case NFSERR_NOT_SYNC: 1339 case NFSERR_BAD_COOKIE: 1340 error = EINVAL; 1341 break; 1342 1343 case NFSERR_NOTSUPP: 1344 error = ENOTSUP; 1345 break; 1346 1347 case NFSERR_TOOSMALL: 1348 case NFSERR_SERVERFAULT: 1349 case NFSERR_BADTYPE: 1350 error = EINVAL; 1351 break; 1352 1353 case NFSERR_TRYLATER: 1354 if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) 1355 break; 1356 m_freem(mrep); 1357 error = 0; 1358 waituntil = time_second + trylater_delay; 1359 while (time_second < waituntil) { 1360 kpause("nfstrylater", false, hz, NULL); 1361 } 1362 trylater_delay *= NFS_TRYLATERDELMUL; 1363 if (trylater_delay > NFS_TRYLATERDELMAX) 1364 trylater_delay = NFS_TRYLATERDELMAX; 1365 /* 1366 * RFC1813: 1367 * The client should wait and then try 1368 * the request with a new RPC transaction ID. 1369 */ 1370 nfs_renewxid(rep); 1371 goto tryagain; 1372 1373 default: 1374 #ifdef DIAGNOSTIC 1375 printf("Invalid rpc error code %d\n", error); 1376 #endif 1377 error = EINVAL; 1378 break; 1379 } 1380 1381 if (nmp->nm_flag & NFSMNT_NFSV3) { 1382 *mrp = mrep; 1383 *mdp = md; 1384 *dposp = dpos; 1385 error |= NFSERR_RETERR; 1386 } else 1387 m_freem(mrep); 1388 goto nfsmout; 1389 } 1390 1391 /* 1392 * note which credential worked to minimize number of retries. 1393 */ 1394 if (use_opencred) 1395 np->n_flag |= NUSEOPENCRED; 1396 else 1397 np->n_flag &= ~NUSEOPENCRED; 1398 1399 *mrp = mrep; 1400 *mdp = md; 1401 *dposp = dpos; 1402 1403 KASSERT(error == 0); 1404 goto nfsmout; 1405 } 1406 m_freem(mrep); 1407 error = EPROTONOSUPPORT; 1408 nfsmout: 1409 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1410 kauth_cred_free(acred); 1411 m_freem(rep->r_mreq); 1412 kmem_free(rep, sizeof(*rep)); 1413 m_freem(mrest_backup); 1414 return (error); 1415 } 1416 #endif /* NFS */ 1417 1418 /* 1419 * Generate the rpc reply header 1420 * siz arg. is used to decide if adding a cluster is worthwhile 1421 */ 1422 int 1423 nfs_rephead(int siz, struct nfsrv_descript *nd, struct nfssvc_sock *slp, int err, int cache, u_quad_t *frev, struct mbuf **mrq, struct mbuf **mbp, char **bposp) 1424 { 1425 u_int32_t *tl; 1426 struct mbuf *mreq; 1427 char *bpos; 1428 struct mbuf *mb; 1429 1430 mreq = m_gethdr(M_WAIT, MT_DATA); 1431 MCLAIM(mreq, &nfs_mowner); 1432 mb = mreq; 1433 /* 1434 * If this is a big reply, use a cluster else 1435 * try and leave leading space for the lower level headers. 1436 */ 1437 siz += RPC_REPLYSIZ; 1438 if (siz >= max_datalen) { 1439 m_clget(mreq, M_WAIT); 1440 } else 1441 mreq->m_data += max_hdr; 1442 tl = mtod(mreq, u_int32_t *); 1443 mreq->m_len = 6 * NFSX_UNSIGNED; 1444 bpos = ((char *)tl) + mreq->m_len; 1445 *tl++ = txdr_unsigned(nd->nd_retxid); 1446 *tl++ = rpc_reply; 1447 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1448 *tl++ = rpc_msgdenied; 1449 if (err & NFSERR_AUTHERR) { 1450 *tl++ = rpc_autherr; 1451 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1452 mreq->m_len -= NFSX_UNSIGNED; 1453 bpos -= NFSX_UNSIGNED; 1454 } else { 1455 *tl++ = rpc_mismatch; 1456 *tl++ = txdr_unsigned(RPC_VER2); 1457 *tl = txdr_unsigned(RPC_VER2); 1458 } 1459 } else { 1460 *tl++ = rpc_msgaccepted; 1461 1462 /* 1463 * For Kerberos authentication, we must send the nickname 1464 * verifier back, otherwise just RPCAUTH_NULL. 1465 */ 1466 if (nd->nd_flag & ND_KERBFULL) { 1467 struct nfsuid *nuidp; 1468 struct timeval ktvin, ktvout; 1469 1470 memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ 1471 1472 LIST_FOREACH(nuidp, 1473 NUIDHASH(slp, kauth_cred_geteuid(nd->nd_cr)), 1474 nu_hash) { 1475 if (kauth_cred_geteuid(nuidp->nu_cr) == 1476 kauth_cred_geteuid(nd->nd_cr) && 1477 (!nd->nd_nam2 || netaddr_match( 1478 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1479 nd->nd_nam2))) 1480 break; 1481 } 1482 if (nuidp) { 1483 ktvin.tv_sec = 1484 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1485 - 1); 1486 ktvin.tv_usec = 1487 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1488 1489 /* 1490 * Encrypt the timestamp in ecb mode using the 1491 * session key. 1492 */ 1493 #ifdef NFSKERB 1494 XXX 1495 #endif 1496 1497 *tl++ = rpc_auth_kerb; 1498 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1499 *tl = ktvout.tv_sec; 1500 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1501 *tl++ = ktvout.tv_usec; 1502 *tl++ = txdr_unsigned( 1503 kauth_cred_geteuid(nuidp->nu_cr)); 1504 } else { 1505 *tl++ = 0; 1506 *tl++ = 0; 1507 } 1508 } else { 1509 *tl++ = 0; 1510 *tl++ = 0; 1511 } 1512 switch (err) { 1513 case EPROGUNAVAIL: 1514 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1515 break; 1516 case EPROGMISMATCH: 1517 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1518 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1519 *tl++ = txdr_unsigned(2); 1520 *tl = txdr_unsigned(3); 1521 break; 1522 case EPROCUNAVAIL: 1523 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1524 break; 1525 case EBADRPC: 1526 *tl = txdr_unsigned(RPC_GARBAGE); 1527 break; 1528 default: 1529 *tl = 0; 1530 if (err != NFSERR_RETVOID) { 1531 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1532 if (err) 1533 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1534 else 1535 *tl = 0; 1536 } 1537 break; 1538 }; 1539 } 1540 1541 if (mrq != NULL) 1542 *mrq = mreq; 1543 *mbp = mb; 1544 *bposp = bpos; 1545 if (err != 0 && err != NFSERR_RETVOID) 1546 nfsstats.srvrpc_errs++; 1547 return (0); 1548 } 1549 1550 static void 1551 nfs_timer_schedule(void) 1552 { 1553 1554 callout_schedule(&nfs_timer_ch, nfs_ticks); 1555 } 1556 1557 void 1558 nfs_timer_start(void) 1559 { 1560 1561 if (callout_pending(&nfs_timer_ch)) 1562 return; 1563 1564 nfs_timer_start_ev.ev_count++; 1565 nfs_timer_schedule(); 1566 } 1567 1568 void 1569 nfs_timer_init(void) 1570 { 1571 1572 mutex_init(&nfs_timer_lock, MUTEX_DEFAULT, IPL_NONE); 1573 callout_init(&nfs_timer_ch, 0); 1574 callout_setfunc(&nfs_timer_ch, nfs_timer, NULL); 1575 evcnt_attach_dynamic(&nfs_timer_ev, EVCNT_TYPE_MISC, NULL, 1576 "nfs", "timer"); 1577 evcnt_attach_dynamic(&nfs_timer_start_ev, EVCNT_TYPE_MISC, NULL, 1578 "nfs", "timer start"); 1579 evcnt_attach_dynamic(&nfs_timer_stop_ev, EVCNT_TYPE_MISC, NULL, 1580 "nfs", "timer stop"); 1581 } 1582 1583 void 1584 nfs_timer_fini(void) 1585 { 1586 1587 callout_halt(&nfs_timer_ch, NULL); 1588 callout_destroy(&nfs_timer_ch); 1589 mutex_destroy(&nfs_timer_lock); 1590 evcnt_detach(&nfs_timer_ev); 1591 evcnt_detach(&nfs_timer_start_ev); 1592 evcnt_detach(&nfs_timer_stop_ev); 1593 } 1594 1595 void 1596 nfs_timer_srvinit(bool (*func)(void)) 1597 { 1598 1599 nfs_timer_srvvec = func; 1600 } 1601 1602 void 1603 nfs_timer_srvfini(void) 1604 { 1605 1606 mutex_enter(&nfs_timer_lock); 1607 nfs_timer_srvvec = NULL; 1608 mutex_exit(&nfs_timer_lock); 1609 } 1610 1611 1612 /* 1613 * Nfs timer routine 1614 * Scan the nfsreq list and retranmit any requests that have timed out 1615 * To avoid retransmission attempts on STREAM sockets (in the future) make 1616 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1617 */ 1618 void 1619 nfs_timer(void *arg) 1620 { 1621 struct nfsreq *rep; 1622 struct mbuf *m; 1623 struct socket *so; 1624 struct nfsmount *nmp; 1625 int timeo; 1626 int error; 1627 bool more = false; 1628 1629 nfs_timer_ev.ev_count++; 1630 1631 mutex_enter(softnet_lock); /* XXX PR 40491 */ 1632 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1633 more = true; 1634 nmp = rep->r_nmp; 1635 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1636 continue; 1637 if (nfs_sigintr(nmp, rep, rep->r_lwp)) { 1638 rep->r_flags |= R_SOFTTERM; 1639 continue; 1640 } 1641 if (rep->r_rtt >= 0) { 1642 rep->r_rtt++; 1643 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1644 timeo = nmp->nm_timeo; 1645 else 1646 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1647 if (nmp->nm_timeouts > 0) 1648 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1649 if (timeo > NFS_MAXTIMEO) 1650 timeo = NFS_MAXTIMEO; 1651 if (rep->r_rtt <= timeo) 1652 continue; 1653 if (nmp->nm_timeouts < 1654 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1655 nmp->nm_timeouts++; 1656 } 1657 /* 1658 * Check for server not responding 1659 */ 1660 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1661 rep->r_rexmit > nmp->nm_deadthresh) { 1662 nfs_msg(rep->r_lwp, 1663 nmp->nm_mountp->mnt_stat.f_mntfromname, 1664 "not responding"); 1665 rep->r_flags |= R_TPRINTFMSG; 1666 } 1667 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1668 nfsstats.rpctimeouts++; 1669 rep->r_flags |= R_SOFTTERM; 1670 continue; 1671 } 1672 if (nmp->nm_sotype != SOCK_DGRAM) { 1673 if (++rep->r_rexmit > NFS_MAXREXMIT) 1674 rep->r_rexmit = NFS_MAXREXMIT; 1675 continue; 1676 } 1677 if ((so = nmp->nm_so) == NULL) 1678 continue; 1679 1680 /* 1681 * If there is enough space and the window allows.. 1682 * Resend it 1683 * Set r_rtt to -1 in case we fail to send it now. 1684 */ 1685 /* solock(so); XXX PR 40491 */ 1686 rep->r_rtt = -1; 1687 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1688 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1689 (rep->r_flags & R_SENT) || 1690 nmp->nm_sent < nmp->nm_cwnd) && 1691 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1692 if (so->so_state & SS_ISCONNECTED) 1693 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1694 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 1695 else 1696 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1697 nmp->nm_nam, (struct mbuf *)0, (struct lwp *)0); 1698 if (error) { 1699 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1700 #ifdef DEBUG 1701 if (ratecheck(&nfs_timer_last_err_time, 1702 &nfs_err_interval)) 1703 printf("%s: ignoring error " 1704 "%d\n", __func__, error); 1705 #endif 1706 so->so_error = 0; 1707 } 1708 } else { 1709 /* 1710 * Iff first send, start timing 1711 * else turn timing off, backoff timer 1712 * and divide congestion window by 2. 1713 */ 1714 if (rep->r_flags & R_SENT) { 1715 rep->r_flags &= ~R_TIMING; 1716 if (++rep->r_rexmit > NFS_MAXREXMIT) 1717 rep->r_rexmit = NFS_MAXREXMIT; 1718 nmp->nm_cwnd >>= 1; 1719 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1720 nmp->nm_cwnd = NFS_CWNDSCALE; 1721 nfsstats.rpcretries++; 1722 } else { 1723 rep->r_flags |= R_SENT; 1724 nmp->nm_sent += NFS_CWNDSCALE; 1725 } 1726 rep->r_rtt = 0; 1727 } 1728 } 1729 /* sounlock(so); XXX PR 40491 */ 1730 } 1731 mutex_exit(softnet_lock); /* XXX PR 40491 */ 1732 1733 mutex_enter(&nfs_timer_lock); 1734 if (nfs_timer_srvvec != NULL) { 1735 more |= (*nfs_timer_srvvec)(); 1736 } 1737 mutex_exit(&nfs_timer_lock); 1738 1739 if (more) { 1740 nfs_timer_schedule(); 1741 } else { 1742 nfs_timer_stop_ev.ev_count++; 1743 } 1744 } 1745 1746 /* 1747 * Test for a termination condition pending on the process. 1748 * This is used for NFSMNT_INT mounts. 1749 */ 1750 int 1751 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct lwp *l) 1752 { 1753 sigset_t ss; 1754 1755 if (rep && (rep->r_flags & R_SOFTTERM)) 1756 return (EINTR); 1757 if (!(nmp->nm_flag & NFSMNT_INT)) 1758 return (0); 1759 if (l) { 1760 sigpending1(l, &ss); 1761 #if 0 1762 sigminusset(&l->l_proc->p_sigctx.ps_sigignore, &ss); 1763 #endif 1764 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1765 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1766 sigismember(&ss, SIGQUIT)) 1767 return (EINTR); 1768 } 1769 return (0); 1770 } 1771 1772 #ifdef NFS 1773 /* 1774 * Lock a socket against others. 1775 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1776 * and also to avoid race conditions between the processes with nfs requests 1777 * in progress when a reconnect is necessary. 1778 */ 1779 static int 1780 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) 1781 { 1782 struct lwp *l; 1783 int timeo = 0; 1784 bool catch = false; 1785 int error = 0; 1786 1787 if (rep) { 1788 l = rep->r_lwp; 1789 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1790 catch = true; 1791 } else 1792 l = NULL; 1793 mutex_enter(&nmp->nm_lock); 1794 while ((nmp->nm_iflag & NFSMNT_SNDLOCK) != 0) { 1795 if (rep && nfs_sigintr(rep->r_nmp, rep, l)) { 1796 error = EINTR; 1797 goto quit; 1798 } 1799 if (catch) { 1800 cv_timedwait_sig(&nmp->nm_sndcv, &nmp->nm_lock, timeo); 1801 } else { 1802 cv_timedwait(&nmp->nm_sndcv, &nmp->nm_lock, timeo); 1803 } 1804 if (catch) { 1805 catch = false; 1806 timeo = 2 * hz; 1807 } 1808 } 1809 nmp->nm_iflag |= NFSMNT_SNDLOCK; 1810 quit: 1811 mutex_exit(&nmp->nm_lock); 1812 return error; 1813 } 1814 1815 /* 1816 * Unlock the stream socket for others. 1817 */ 1818 static void 1819 nfs_sndunlock(struct nfsmount *nmp) 1820 { 1821 1822 mutex_enter(&nmp->nm_lock); 1823 if ((nmp->nm_iflag & NFSMNT_SNDLOCK) == 0) 1824 panic("nfs sndunlock"); 1825 nmp->nm_iflag &= ~NFSMNT_SNDLOCK; 1826 cv_signal(&nmp->nm_sndcv); 1827 mutex_exit(&nmp->nm_lock); 1828 } 1829 #endif /* NFS */ 1830 1831 static int 1832 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep) 1833 { 1834 int *flagp = &nmp->nm_iflag; 1835 int slptimeo = 0; 1836 bool catch; 1837 int error = 0; 1838 1839 KASSERT(nmp == rep->r_nmp); 1840 1841 catch = (nmp->nm_flag & NFSMNT_INT) != 0; 1842 mutex_enter(&nmp->nm_lock); 1843 while (/* CONSTCOND */ true) { 1844 if (*flagp & NFSMNT_DISMNT) { 1845 cv_signal(&nmp->nm_disconcv); 1846 error = EIO; 1847 break; 1848 } 1849 /* If our reply was received while we were sleeping, 1850 * then just return without taking the lock to avoid a 1851 * situation where a single iod could 'capture' the 1852 * receive lock. 1853 */ 1854 if (rep->r_mrep != NULL) { 1855 error = EALREADY; 1856 break; 1857 } 1858 if (nfs_sigintr(rep->r_nmp, rep, rep->r_lwp)) { 1859 error = EINTR; 1860 break; 1861 } 1862 if ((*flagp & NFSMNT_RCVLOCK) == 0) { 1863 *flagp |= NFSMNT_RCVLOCK; 1864 break; 1865 } 1866 if (catch) { 1867 cv_timedwait_sig(&nmp->nm_rcvcv, &nmp->nm_lock, 1868 slptimeo); 1869 } else { 1870 cv_timedwait(&nmp->nm_rcvcv, &nmp->nm_lock, 1871 slptimeo); 1872 } 1873 if (catch) { 1874 catch = false; 1875 slptimeo = 2 * hz; 1876 } 1877 } 1878 mutex_exit(&nmp->nm_lock); 1879 return error; 1880 } 1881 1882 /* 1883 * Unlock the stream socket for others. 1884 */ 1885 static void 1886 nfs_rcvunlock(struct nfsmount *nmp) 1887 { 1888 1889 mutex_enter(&nmp->nm_lock); 1890 if ((nmp->nm_iflag & NFSMNT_RCVLOCK) == 0) 1891 panic("nfs rcvunlock"); 1892 nmp->nm_iflag &= ~NFSMNT_RCVLOCK; 1893 cv_broadcast(&nmp->nm_rcvcv); 1894 mutex_exit(&nmp->nm_lock); 1895 } 1896 1897 /* 1898 * Parse an RPC request 1899 * - verify it 1900 * - allocate and fill in the cred. 1901 */ 1902 int 1903 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 1904 { 1905 int len, i; 1906 u_int32_t *tl; 1907 int32_t t1; 1908 struct uio uio; 1909 struct iovec iov; 1910 char *dpos, *cp2, *cp; 1911 u_int32_t nfsvers, auth_type; 1912 uid_t nickuid; 1913 int error = 0, ticklen; 1914 struct mbuf *mrep, *md; 1915 struct nfsuid *nuidp; 1916 struct timeval tvin, tvout; 1917 1918 memset(&tvout, 0, sizeof tvout); /* XXX gcc */ 1919 1920 KASSERT(nd->nd_cr == NULL); 1921 mrep = nd->nd_mrep; 1922 md = nd->nd_md; 1923 dpos = nd->nd_dpos; 1924 if (has_header) { 1925 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1926 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1927 if (*tl++ != rpc_call) { 1928 m_freem(mrep); 1929 return (EBADRPC); 1930 } 1931 } else 1932 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1933 nd->nd_repstat = 0; 1934 nd->nd_flag = 0; 1935 if (*tl++ != rpc_vers) { 1936 nd->nd_repstat = ERPCMISMATCH; 1937 nd->nd_procnum = NFSPROC_NOOP; 1938 return (0); 1939 } 1940 if (*tl != nfs_prog) { 1941 nd->nd_repstat = EPROGUNAVAIL; 1942 nd->nd_procnum = NFSPROC_NOOP; 1943 return (0); 1944 } 1945 tl++; 1946 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1947 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 1948 nd->nd_repstat = EPROGMISMATCH; 1949 nd->nd_procnum = NFSPROC_NOOP; 1950 return (0); 1951 } 1952 if (nfsvers == NFS_VER3) 1953 nd->nd_flag = ND_NFSV3; 1954 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1955 if (nd->nd_procnum == NFSPROC_NULL) 1956 return (0); 1957 if (nd->nd_procnum > NFSPROC_COMMIT || 1958 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1959 nd->nd_repstat = EPROCUNAVAIL; 1960 nd->nd_procnum = NFSPROC_NOOP; 1961 return (0); 1962 } 1963 if ((nd->nd_flag & ND_NFSV3) == 0) 1964 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1965 auth_type = *tl++; 1966 len = fxdr_unsigned(int, *tl++); 1967 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1968 m_freem(mrep); 1969 return (EBADRPC); 1970 } 1971 1972 nd->nd_flag &= ~ND_KERBAUTH; 1973 /* 1974 * Handle auth_unix or auth_kerb. 1975 */ 1976 if (auth_type == rpc_auth_unix) { 1977 uid_t uid; 1978 gid_t gid; 1979 1980 nd->nd_cr = kauth_cred_alloc(); 1981 len = fxdr_unsigned(int, *++tl); 1982 if (len < 0 || len > NFS_MAXNAMLEN) { 1983 m_freem(mrep); 1984 error = EBADRPC; 1985 goto errout; 1986 } 1987 nfsm_adv(nfsm_rndup(len)); 1988 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1989 1990 uid = fxdr_unsigned(uid_t, *tl++); 1991 gid = fxdr_unsigned(gid_t, *tl++); 1992 kauth_cred_setuid(nd->nd_cr, uid); 1993 kauth_cred_seteuid(nd->nd_cr, uid); 1994 kauth_cred_setsvuid(nd->nd_cr, uid); 1995 kauth_cred_setgid(nd->nd_cr, gid); 1996 kauth_cred_setegid(nd->nd_cr, gid); 1997 kauth_cred_setsvgid(nd->nd_cr, gid); 1998 1999 len = fxdr_unsigned(int, *tl); 2000 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2001 m_freem(mrep); 2002 error = EBADRPC; 2003 goto errout; 2004 } 2005 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 2006 2007 if (len > 0) { 2008 size_t grbuf_size = min(len, NGROUPS) * sizeof(gid_t); 2009 gid_t *grbuf = kmem_alloc(grbuf_size, KM_SLEEP); 2010 2011 for (i = 0; i < len; i++) { 2012 if (i < NGROUPS) /* XXX elad */ 2013 grbuf[i] = fxdr_unsigned(gid_t, *tl++); 2014 else 2015 tl++; 2016 } 2017 kauth_cred_setgroups(nd->nd_cr, grbuf, 2018 min(len, NGROUPS), -1, UIO_SYSSPACE); 2019 kmem_free(grbuf, grbuf_size); 2020 } 2021 2022 len = fxdr_unsigned(int, *++tl); 2023 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2024 m_freem(mrep); 2025 error = EBADRPC; 2026 goto errout; 2027 } 2028 if (len > 0) 2029 nfsm_adv(nfsm_rndup(len)); 2030 } else if (auth_type == rpc_auth_kerb) { 2031 switch (fxdr_unsigned(int, *tl++)) { 2032 case RPCAKN_FULLNAME: 2033 ticklen = fxdr_unsigned(int, *tl); 2034 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2035 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2036 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2037 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2038 m_freem(mrep); 2039 error = EBADRPC; 2040 goto errout; 2041 } 2042 uio.uio_offset = 0; 2043 uio.uio_iov = &iov; 2044 uio.uio_iovcnt = 1; 2045 UIO_SETUP_SYSSPACE(&uio); 2046 iov.iov_base = (void *)&nfsd->nfsd_authstr[4]; 2047 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2048 nfsm_mtouio(&uio, uio.uio_resid); 2049 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2050 if (*tl++ != rpc_auth_kerb || 2051 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2052 printf("Bad kerb verifier\n"); 2053 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2054 nd->nd_procnum = NFSPROC_NOOP; 2055 return (0); 2056 } 2057 nfsm_dissect(cp, void *, 4 * NFSX_UNSIGNED); 2058 tl = (u_int32_t *)cp; 2059 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2060 printf("Not fullname kerb verifier\n"); 2061 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2062 nd->nd_procnum = NFSPROC_NOOP; 2063 return (0); 2064 } 2065 cp += NFSX_UNSIGNED; 2066 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 2067 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2068 nd->nd_flag |= ND_KERBFULL; 2069 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2070 break; 2071 case RPCAKN_NICKNAME: 2072 if (len != 2 * NFSX_UNSIGNED) { 2073 printf("Kerb nickname short\n"); 2074 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2075 nd->nd_procnum = NFSPROC_NOOP; 2076 return (0); 2077 } 2078 nickuid = fxdr_unsigned(uid_t, *tl); 2079 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2080 if (*tl++ != rpc_auth_kerb || 2081 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2082 printf("Kerb nick verifier bad\n"); 2083 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2084 nd->nd_procnum = NFSPROC_NOOP; 2085 return (0); 2086 } 2087 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2088 tvin.tv_sec = *tl++; 2089 tvin.tv_usec = *tl; 2090 2091 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 2092 nu_hash) { 2093 if (kauth_cred_geteuid(nuidp->nu_cr) == nickuid && 2094 (!nd->nd_nam2 || 2095 netaddr_match(NU_NETFAM(nuidp), 2096 &nuidp->nu_haddr, nd->nd_nam2))) 2097 break; 2098 } 2099 if (!nuidp) { 2100 nd->nd_repstat = 2101 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2102 nd->nd_procnum = NFSPROC_NOOP; 2103 return (0); 2104 } 2105 2106 /* 2107 * Now, decrypt the timestamp using the session key 2108 * and validate it. 2109 */ 2110 #ifdef NFSKERB 2111 XXX 2112 #endif 2113 2114 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2115 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2116 if (nuidp->nu_expire < time_second || 2117 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2118 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2119 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2120 nuidp->nu_expire = 0; 2121 nd->nd_repstat = 2122 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2123 nd->nd_procnum = NFSPROC_NOOP; 2124 return (0); 2125 } 2126 kauth_cred_hold(nuidp->nu_cr); 2127 nd->nd_cr = nuidp->nu_cr; 2128 nd->nd_flag |= ND_KERBNICK; 2129 } 2130 } else { 2131 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2132 nd->nd_procnum = NFSPROC_NOOP; 2133 return (0); 2134 } 2135 2136 nd->nd_md = md; 2137 nd->nd_dpos = dpos; 2138 KASSERT((nd->nd_cr == NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) != 0) 2139 || (nd->nd_cr != NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) == 0)); 2140 return (0); 2141 nfsmout: 2142 errout: 2143 KASSERT(error != 0); 2144 if (nd->nd_cr != NULL) { 2145 kauth_cred_free(nd->nd_cr); 2146 nd->nd_cr = NULL; 2147 } 2148 return (error); 2149 } 2150 2151 int 2152 nfs_msg(struct lwp *l, const char *server, const char *msg) 2153 { 2154 tpr_t tpr; 2155 2156 if (l) 2157 tpr = tprintf_open(l->l_proc); 2158 else 2159 tpr = NULL; 2160 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2161 tprintf_close(tpr); 2162 return (0); 2163 } 2164 2165 static struct pool nfs_srvdesc_pool; 2166 2167 void 2168 nfsdreq_init(void) 2169 { 2170 2171 pool_init(&nfs_srvdesc_pool, sizeof(struct nfsrv_descript), 2172 0, 0, 0, "nfsrvdescpl", &pool_allocator_nointr, IPL_NONE); 2173 } 2174 2175 void 2176 nfsdreq_fini(void) 2177 { 2178 2179 pool_destroy(&nfs_srvdesc_pool); 2180 } 2181 2182 struct nfsrv_descript * 2183 nfsdreq_alloc(void) 2184 { 2185 struct nfsrv_descript *nd; 2186 2187 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2188 nd->nd_cr = NULL; 2189 return nd; 2190 } 2191 2192 void 2193 nfsdreq_free(struct nfsrv_descript *nd) 2194 { 2195 kauth_cred_t cr; 2196 2197 cr = nd->nd_cr; 2198 if (cr != NULL) { 2199 kauth_cred_free(cr); 2200 } 2201 pool_put(&nfs_srvdesc_pool, nd); 2202 } 2203
Indexes created Sun Sep 21 20:09:37 GMT 2025