nfs_socket.c revision 1.180
1 /* $NetBSD: nfs_socket.c,v 1.180 2009/03/14 21:04:25 dsl 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 1.180 2009/03/14 21:04:25 dsl 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 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 = 0; 545 } 546 return (error); 547 } 548 549 #ifdef NFS 550 /* 551 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 552 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 553 * Mark and consolidate the data into a new mbuf list. 554 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 555 * small mbufs. 556 * For SOCK_STREAM we must be very careful to read an entire record once 557 * we have read any of it, even if the system call has been interrupted. 558 */ 559 static int 560 nfs_receive(struct nfsreq *rep, struct mbuf **aname, struct mbuf **mp, 561 struct lwp *l) 562 { 563 struct socket *so; 564 struct uio auio; 565 struct iovec aio; 566 struct mbuf *m; 567 struct mbuf *control; 568 u_int32_t len; 569 struct mbuf **getnam; 570 int error, sotype, rcvflg; 571 572 /* 573 * Set up arguments for soreceive() 574 */ 575 *mp = (struct mbuf *)0; 576 *aname = (struct mbuf *)0; 577 sotype = rep->r_nmp->nm_sotype; 578 579 /* 580 * For reliable protocols, lock against other senders/receivers 581 * in case a reconnect is necessary. 582 * For SOCK_STREAM, first get the Record Mark to find out how much 583 * more there is to get. 584 * We must lock the socket against other receivers 585 * until we have an entire rpc request/reply. 586 */ 587 if (sotype != SOCK_DGRAM) { 588 error = nfs_sndlock(rep->r_nmp, rep); 589 if (error) 590 return (error); 591 tryagain: 592 /* 593 * Check for fatal errors and resending request. 594 */ 595 /* 596 * Ugh: If a reconnect attempt just happened, nm_so 597 * would have changed. NULL indicates a failed 598 * attempt that has essentially shut down this 599 * mount point. 600 */ 601 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 602 nfs_sndunlock(rep->r_nmp); 603 return (EINTR); 604 } 605 so = rep->r_nmp->nm_so; 606 if (!so) { 607 error = nfs_reconnect(rep); 608 if (error) { 609 nfs_sndunlock(rep->r_nmp); 610 return (error); 611 } 612 goto tryagain; 613 } 614 while (rep->r_flags & R_MUSTRESEND) { 615 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 616 nfsstats.rpcretries++; 617 rep->r_rtt = 0; 618 rep->r_flags &= ~R_TIMING; 619 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, l); 620 if (error) { 621 if (error == EINTR || error == ERESTART || 622 (error = nfs_reconnect(rep)) != 0) { 623 nfs_sndunlock(rep->r_nmp); 624 return (error); 625 } 626 goto tryagain; 627 } 628 } 629 nfs_sndunlock(rep->r_nmp); 630 if (sotype == SOCK_STREAM) { 631 aio.iov_base = (void *) &len; 632 aio.iov_len = sizeof(u_int32_t); 633 auio.uio_iov = &aio; 634 auio.uio_iovcnt = 1; 635 auio.uio_rw = UIO_READ; 636 auio.uio_offset = 0; 637 auio.uio_resid = sizeof(u_int32_t); 638 UIO_SETUP_SYSSPACE(&auio); 639 do { 640 rcvflg = MSG_WAITALL; 641 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 642 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 643 if (error == EWOULDBLOCK && rep) { 644 if (rep->r_flags & R_SOFTTERM) 645 return (EINTR); 646 /* 647 * if it seems that the server died after it 648 * received our request, set EPIPE so that 649 * we'll reconnect and retransmit requests. 650 */ 651 if (rep->r_rexmit >= rep->r_nmp->nm_retry) { 652 nfsstats.rpctimeouts++; 653 error = EPIPE; 654 } 655 } 656 } while (error == EWOULDBLOCK); 657 if (!error && auio.uio_resid > 0) { 658 /* 659 * Don't log a 0 byte receive; it means 660 * that the socket has been closed, and 661 * can happen during normal operation 662 * (forcible unmount or Solaris server). 663 */ 664 if (auio.uio_resid != sizeof (u_int32_t)) 665 log(LOG_INFO, 666 "short receive (%lu/%lu) from nfs server %s\n", 667 (u_long)sizeof(u_int32_t) - auio.uio_resid, 668 (u_long)sizeof(u_int32_t), 669 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 670 error = EPIPE; 671 } 672 if (error) 673 goto errout; 674 len = ntohl(len) & ~0x80000000; 675 /* 676 * This is SERIOUS! We are out of sync with the sender 677 * and forcing a disconnect/reconnect is all I can do. 678 */ 679 if (len > NFS_MAXPACKET) { 680 log(LOG_ERR, "%s (%d) from nfs server %s\n", 681 "impossible packet length", 682 len, 683 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 684 error = EFBIG; 685 goto errout; 686 } 687 auio.uio_resid = len; 688 do { 689 rcvflg = MSG_WAITALL; 690 error = (*so->so_receive)(so, (struct mbuf **)0, 691 &auio, mp, (struct mbuf **)0, &rcvflg); 692 } while (error == EWOULDBLOCK || error == EINTR || 693 error == ERESTART); 694 if (!error && auio.uio_resid > 0) { 695 if (len != auio.uio_resid) 696 log(LOG_INFO, 697 "short receive (%lu/%d) from nfs server %s\n", 698 (u_long)len - auio.uio_resid, len, 699 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 700 error = EPIPE; 701 } 702 } else { 703 /* 704 * NB: Since uio_resid is big, MSG_WAITALL is ignored 705 * and soreceive() will return when it has either a 706 * control msg or a data msg. 707 * We have no use for control msg., but must grab them 708 * and then throw them away so we know what is going 709 * on. 710 */ 711 auio.uio_resid = len = 100000000; /* Anything Big */ 712 /* not need to setup uio_vmspace */ 713 do { 714 rcvflg = 0; 715 error = (*so->so_receive)(so, (struct mbuf **)0, 716 &auio, mp, &control, &rcvflg); 717 if (control) 718 m_freem(control); 719 if (error == EWOULDBLOCK && rep) { 720 if (rep->r_flags & R_SOFTTERM) 721 return (EINTR); 722 } 723 } while (error == EWOULDBLOCK || 724 (!error && *mp == NULL && control)); 725 if ((rcvflg & MSG_EOR) == 0) 726 printf("Egad!!\n"); 727 if (!error && *mp == NULL) 728 error = EPIPE; 729 len -= auio.uio_resid; 730 } 731 errout: 732 if (error && error != EINTR && error != ERESTART) { 733 m_freem(*mp); 734 *mp = (struct mbuf *)0; 735 if (error != EPIPE) 736 log(LOG_INFO, 737 "receive error %d from nfs server %s\n", 738 error, 739 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 740 error = nfs_sndlock(rep->r_nmp, rep); 741 if (!error) 742 error = nfs_reconnect(rep); 743 if (!error) 744 goto tryagain; 745 else 746 nfs_sndunlock(rep->r_nmp); 747 } 748 } else { 749 if ((so = rep->r_nmp->nm_so) == NULL) 750 return (EACCES); 751 if (so->so_state & SS_ISCONNECTED) 752 getnam = (struct mbuf **)0; 753 else 754 getnam = aname; 755 auio.uio_resid = len = 1000000; 756 /* not need to setup uio_vmspace */ 757 do { 758 rcvflg = 0; 759 error = (*so->so_receive)(so, getnam, &auio, mp, 760 (struct mbuf **)0, &rcvflg); 761 if (error == EWOULDBLOCK && 762 (rep->r_flags & R_SOFTTERM)) 763 return (EINTR); 764 } while (error == EWOULDBLOCK); 765 len -= auio.uio_resid; 766 if (!error && *mp == NULL) 767 error = EPIPE; 768 } 769 if (error) { 770 m_freem(*mp); 771 *mp = (struct mbuf *)0; 772 } 773 return (error); 774 } 775 776 /* 777 * Implement receipt of reply on a socket. 778 * We must search through the list of received datagrams matching them 779 * with outstanding requests using the xid, until ours is found. 780 */ 781 /* ARGSUSED */ 782 static int 783 nfs_reply(struct nfsreq *myrep, struct lwp *lwp) 784 { 785 struct nfsreq *rep; 786 struct nfsmount *nmp = myrep->r_nmp; 787 int32_t t1; 788 struct mbuf *mrep, *nam, *md; 789 u_int32_t rxid, *tl; 790 char *dpos, *cp2; 791 int error; 792 793 /* 794 * Loop around until we get our own reply 795 */ 796 for (;;) { 797 /* 798 * Lock against other receivers so that I don't get stuck in 799 * sbwait() after someone else has received my reply for me. 800 * Also necessary for connection based protocols to avoid 801 * race conditions during a reconnect. 802 */ 803 error = nfs_rcvlock(nmp, myrep); 804 if (error == EALREADY) 805 return (0); 806 if (error) 807 return (error); 808 /* 809 * Get the next Rpc reply off the socket 810 */ 811 812 mutex_enter(&nmp->nm_lock); 813 nmp->nm_waiters++; 814 mutex_exit(&nmp->nm_lock); 815 816 error = nfs_receive(myrep, &nam, &mrep, lwp); 817 818 mutex_enter(&nmp->nm_lock); 819 nmp->nm_waiters--; 820 cv_signal(&nmp->nm_disconcv); 821 mutex_exit(&nmp->nm_lock); 822 823 if (error) { 824 nfs_rcvunlock(nmp); 825 826 if (nmp->nm_iflag & NFSMNT_DISMNT) { 827 /* 828 * Oops, we're going away now.. 829 */ 830 return error; 831 } 832 /* 833 * Ignore routing errors on connectionless protocols? ? 834 */ 835 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 836 nmp->nm_so->so_error = 0; 837 #ifdef DEBUG 838 if (ratecheck(&nfs_reply_last_err_time, 839 &nfs_err_interval)) 840 printf("%s: ignoring error %d\n", 841 __func__, error); 842 #endif 843 continue; 844 } 845 return (error); 846 } 847 if (nam) 848 m_freem(nam); 849 850 /* 851 * Get the xid and check that it is an rpc reply 852 */ 853 md = mrep; 854 dpos = mtod(md, void *); 855 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 856 rxid = *tl++; 857 if (*tl != rpc_reply) { 858 nfsstats.rpcinvalid++; 859 m_freem(mrep); 860 nfsmout: 861 nfs_rcvunlock(nmp); 862 continue; 863 } 864 865 /* 866 * Loop through the request list to match up the reply 867 * Iff no match, just drop the datagram 868 */ 869 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 870 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 871 /* Found it.. */ 872 rep->r_mrep = mrep; 873 rep->r_md = md; 874 rep->r_dpos = dpos; 875 if (nfsrtton) { 876 struct rttl *rt; 877 878 rt = &nfsrtt.rttl[nfsrtt.pos]; 879 rt->proc = rep->r_procnum; 880 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 881 rt->sent = nmp->nm_sent; 882 rt->cwnd = nmp->nm_cwnd; 883 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 884 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 885 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; 886 getmicrotime(&rt->tstamp); 887 if (rep->r_flags & R_TIMING) 888 rt->rtt = rep->r_rtt; 889 else 890 rt->rtt = 1000000; 891 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 892 } 893 /* 894 * Update congestion window. 895 * Do the additive increase of 896 * one rpc/rtt. 897 */ 898 if (nmp->nm_cwnd <= nmp->nm_sent) { 899 nmp->nm_cwnd += 900 (NFS_CWNDSCALE * NFS_CWNDSCALE + 901 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 902 if (nmp->nm_cwnd > NFS_MAXCWND) 903 nmp->nm_cwnd = NFS_MAXCWND; 904 } 905 rep->r_flags &= ~R_SENT; 906 nmp->nm_sent -= NFS_CWNDSCALE; 907 /* 908 * Update rtt using a gain of 0.125 on the mean 909 * and a gain of 0.25 on the deviation. 910 */ 911 if (rep->r_flags & R_TIMING) { 912 /* 913 * Since the timer resolution of 914 * NFS_HZ is so course, it can often 915 * result in r_rtt == 0. Since 916 * r_rtt == N means that the actual 917 * rtt is between N+dt and N+2-dt ticks, 918 * add 1. 919 */ 920 t1 = rep->r_rtt + 1; 921 t1 -= (NFS_SRTT(rep) >> 3); 922 NFS_SRTT(rep) += t1; 923 if (t1 < 0) 924 t1 = -t1; 925 t1 -= (NFS_SDRTT(rep) >> 2); 926 NFS_SDRTT(rep) += t1; 927 } 928 nmp->nm_timeouts = 0; 929 break; 930 } 931 } 932 nfs_rcvunlock(nmp); 933 /* 934 * If not matched to a request, drop it. 935 * If it's mine, get out. 936 */ 937 if (rep == 0) { 938 nfsstats.rpcunexpected++; 939 m_freem(mrep); 940 } else if (rep == myrep) { 941 if (rep->r_mrep == NULL) 942 panic("nfsreply nil"); 943 return (0); 944 } 945 } 946 } 947 948 /* 949 * nfs_request - goes something like this 950 * - fill in request struct 951 * - links it into list 952 * - calls nfs_send() for first transmit 953 * - calls nfs_receive() to get reply 954 * - break down rpc header and return with nfs reply pointed to 955 * by mrep or error 956 * nb: always frees up mreq mbuf list 957 */ 958 int 959 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) 960 { 961 struct mbuf *m, *mrep; 962 struct nfsreq *rep; 963 u_int32_t *tl; 964 int i; 965 struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); 966 struct mbuf *md, *mheadend; 967 char nickv[RPCX_NICKVERF]; 968 time_t waituntil; 969 char *dpos, *cp2; 970 int t1, s, error = 0, mrest_len, auth_len, auth_type; 971 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 972 int verf_len, verf_type; 973 u_int32_t xid; 974 char *auth_str, *verf_str; 975 NFSKERBKEY_T key; /* save session key */ 976 kauth_cred_t acred; 977 struct mbuf *mrest_backup = NULL; 978 kauth_cred_t origcred = NULL; /* XXX: gcc */ 979 bool retry_cred = true; 980 bool use_opencred = (np->n_flag & NUSEOPENCRED) != 0; 981 982 if (rexmitp != NULL) 983 *rexmitp = 0; 984 985 acred = kauth_cred_alloc(); 986 987 tryagain_cred: 988 KASSERT(cred != NULL); 989 rep = kmem_alloc(sizeof(*rep), KM_SLEEP); 990 rep->r_nmp = nmp; 991 KASSERT(lwp == NULL || lwp == curlwp); 992 rep->r_lwp = lwp; 993 rep->r_procnum = procnum; 994 i = 0; 995 m = mrest; 996 while (m) { 997 i += m->m_len; 998 m = m->m_next; 999 } 1000 mrest_len = i; 1001 1002 /* 1003 * Get the RPC header with authorization. 1004 */ 1005 kerbauth: 1006 verf_str = auth_str = (char *)0; 1007 if (nmp->nm_flag & NFSMNT_KERB) { 1008 verf_str = nickv; 1009 verf_len = sizeof (nickv); 1010 auth_type = RPCAUTH_KERB4; 1011 memset((void *)key, 0, sizeof (key)); 1012 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 1013 &auth_len, verf_str, verf_len)) { 1014 error = nfs_getauth(nmp, rep, cred, &auth_str, 1015 &auth_len, verf_str, &verf_len, key); 1016 if (error) { 1017 kmem_free(rep, sizeof(*rep)); 1018 m_freem(mrest); 1019 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1020 kauth_cred_free(acred); 1021 return (error); 1022 } 1023 } 1024 retry_cred = false; 1025 } else { 1026 /* AUTH_UNIX */ 1027 uid_t uid; 1028 gid_t gid; 1029 1030 /* 1031 * on the most unix filesystems, permission checks are 1032 * done when the file is open(2)'ed. 1033 * ie. once a file is successfully open'ed, 1034 * following i/o operations never fail with EACCES. 1035 * we try to follow the semantics as far as possible. 1036 * 1037 * note that we expect that the nfs server always grant 1038 * accesses by the file's owner. 1039 */ 1040 origcred = cred; 1041 switch (procnum) { 1042 case NFSPROC_READ: 1043 case NFSPROC_WRITE: 1044 case NFSPROC_COMMIT: 1045 uid = np->n_vattr->va_uid; 1046 gid = np->n_vattr->va_gid; 1047 if (kauth_cred_geteuid(cred) == uid && 1048 kauth_cred_getegid(cred) == gid) { 1049 retry_cred = false; 1050 break; 1051 } 1052 if (use_opencred) 1053 break; 1054 kauth_cred_setuid(acred, uid); 1055 kauth_cred_seteuid(acred, uid); 1056 kauth_cred_setsvuid(acred, uid); 1057 kauth_cred_setgid(acred, gid); 1058 kauth_cred_setegid(acred, gid); 1059 kauth_cred_setsvgid(acred, gid); 1060 cred = acred; 1061 break; 1062 default: 1063 retry_cred = false; 1064 break; 1065 } 1066 /* 1067 * backup mbuf chain if we can need it later to retry. 1068 * 1069 * XXX maybe we can keep a direct reference to 1070 * mrest without doing m_copym, but it's ...ugly. 1071 */ 1072 if (retry_cred) 1073 mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); 1074 auth_type = RPCAUTH_UNIX; 1075 /* XXX elad - ngroups */ 1076 auth_len = (((kauth_cred_ngroups(cred) > nmp->nm_numgrps) ? 1077 nmp->nm_numgrps : kauth_cred_ngroups(cred)) << 2) + 1078 5 * NFSX_UNSIGNED; 1079 } 1080 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1081 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1082 if (auth_str) 1083 free(auth_str, M_TEMP); 1084 1085 /* 1086 * For stream protocols, insert a Sun RPC Record Mark. 1087 */ 1088 if (nmp->nm_sotype == SOCK_STREAM) { 1089 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1090 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1091 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1092 } 1093 rep->r_mreq = m; 1094 rep->r_xid = xid; 1095 tryagain: 1096 if (nmp->nm_flag & NFSMNT_SOFT) 1097 rep->r_retry = nmp->nm_retry; 1098 else 1099 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1100 rep->r_rtt = rep->r_rexmit = 0; 1101 if (proct[procnum] > 0) 1102 rep->r_flags = R_TIMING; 1103 else 1104 rep->r_flags = 0; 1105 rep->r_mrep = NULL; 1106 1107 /* 1108 * Do the client side RPC. 1109 */ 1110 nfsstats.rpcrequests++; 1111 /* 1112 * Chain request into list of outstanding requests. Be sure 1113 * to put it LAST so timer finds oldest requests first. 1114 */ 1115 s = splsoftnet(); 1116 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1117 nfs_timer_start(); 1118 1119 /* 1120 * If backing off another request or avoiding congestion, don't 1121 * send this one now but let timer do it. If not timing a request, 1122 * do it now. 1123 */ 1124 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1125 (nmp->nm_flag & NFSMNT_DUMBTIMR) || nmp->nm_sent < nmp->nm_cwnd)) { 1126 splx(s); 1127 if (nmp->nm_soflags & PR_CONNREQUIRED) 1128 error = nfs_sndlock(nmp, rep); 1129 if (!error) { 1130 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1131 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, lwp); 1132 if (nmp->nm_soflags & PR_CONNREQUIRED) 1133 nfs_sndunlock(nmp); 1134 } 1135 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1136 nmp->nm_sent += NFS_CWNDSCALE; 1137 rep->r_flags |= R_SENT; 1138 } 1139 } else { 1140 splx(s); 1141 rep->r_rtt = -1; 1142 } 1143 1144 /* 1145 * Wait for the reply from our send or the timer's. 1146 */ 1147 if (!error || error == EPIPE) 1148 error = nfs_reply(rep, lwp); 1149 1150 /* 1151 * RPC done, unlink the request. 1152 */ 1153 s = splsoftnet(); 1154 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1155 splx(s); 1156 1157 /* 1158 * Decrement the outstanding request count. 1159 */ 1160 if (rep->r_flags & R_SENT) { 1161 rep->r_flags &= ~R_SENT; /* paranoia */ 1162 nmp->nm_sent -= NFS_CWNDSCALE; 1163 } 1164 1165 if (rexmitp != NULL) { 1166 int rexmit; 1167 1168 if (nmp->nm_sotype != SOCK_DGRAM) 1169 rexmit = (rep->r_flags & R_REXMITTED) != 0; 1170 else 1171 rexmit = rep->r_rexmit; 1172 *rexmitp = rexmit; 1173 } 1174 1175 /* 1176 * If there was a successful reply and a tprintf msg. 1177 * tprintf a response. 1178 */ 1179 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1180 nfs_msg(rep->r_lwp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1181 "is alive again"); 1182 mrep = rep->r_mrep; 1183 md = rep->r_md; 1184 dpos = rep->r_dpos; 1185 if (error) 1186 goto nfsmout; 1187 1188 /* 1189 * break down the rpc header and check if ok 1190 */ 1191 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1192 if (*tl++ == rpc_msgdenied) { 1193 if (*tl == rpc_mismatch) 1194 error = EOPNOTSUPP; 1195 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1196 if (!failed_auth) { 1197 failed_auth++; 1198 mheadend->m_next = (struct mbuf *)0; 1199 m_freem(mrep); 1200 m_freem(rep->r_mreq); 1201 goto kerbauth; 1202 } else 1203 error = EAUTH; 1204 } else 1205 error = EACCES; 1206 m_freem(mrep); 1207 goto nfsmout; 1208 } 1209 1210 /* 1211 * Grab any Kerberos verifier, otherwise just throw it away. 1212 */ 1213 verf_type = fxdr_unsigned(int, *tl++); 1214 i = fxdr_unsigned(int32_t, *tl); 1215 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1216 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1217 if (error) 1218 goto nfsmout; 1219 } else if (i > 0) 1220 nfsm_adv(nfsm_rndup(i)); 1221 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1222 /* 0 == ok */ 1223 if (*tl == 0) { 1224 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1225 if (*tl != 0) { 1226 error = fxdr_unsigned(int, *tl); 1227 switch (error) { 1228 case NFSERR_PERM: 1229 error = EPERM; 1230 break; 1231 1232 case NFSERR_NOENT: 1233 error = ENOENT; 1234 break; 1235 1236 case NFSERR_IO: 1237 error = EIO; 1238 break; 1239 1240 case NFSERR_NXIO: 1241 error = ENXIO; 1242 break; 1243 1244 case NFSERR_ACCES: 1245 error = EACCES; 1246 if (!retry_cred) 1247 break; 1248 m_freem(mrep); 1249 m_freem(rep->r_mreq); 1250 kmem_free(rep, sizeof(*rep)); 1251 use_opencred = !use_opencred; 1252 if (mrest_backup == NULL) { 1253 /* m_copym failure */ 1254 KASSERT( 1255 kauth_cred_getrefcnt(acred) == 1); 1256 kauth_cred_free(acred); 1257 return ENOMEM; 1258 } 1259 mrest = mrest_backup; 1260 mrest_backup = NULL; 1261 cred = origcred; 1262 error = 0; 1263 retry_cred = false; 1264 goto tryagain_cred; 1265 1266 case NFSERR_EXIST: 1267 error = EEXIST; 1268 break; 1269 1270 case NFSERR_XDEV: 1271 error = EXDEV; 1272 break; 1273 1274 case NFSERR_NODEV: 1275 error = ENODEV; 1276 break; 1277 1278 case NFSERR_NOTDIR: 1279 error = ENOTDIR; 1280 break; 1281 1282 case NFSERR_ISDIR: 1283 error = EISDIR; 1284 break; 1285 1286 case NFSERR_INVAL: 1287 error = EINVAL; 1288 break; 1289 1290 case NFSERR_FBIG: 1291 error = EFBIG; 1292 break; 1293 1294 case NFSERR_NOSPC: 1295 error = ENOSPC; 1296 break; 1297 1298 case NFSERR_ROFS: 1299 error = EROFS; 1300 break; 1301 1302 case NFSERR_MLINK: 1303 error = EMLINK; 1304 break; 1305 1306 case NFSERR_TIMEDOUT: 1307 error = ETIMEDOUT; 1308 break; 1309 1310 case NFSERR_NAMETOL: 1311 error = ENAMETOOLONG; 1312 break; 1313 1314 case NFSERR_NOTEMPTY: 1315 error = ENOTEMPTY; 1316 break; 1317 1318 case NFSERR_DQUOT: 1319 error = EDQUOT; 1320 break; 1321 1322 case NFSERR_STALE: 1323 /* 1324 * If the File Handle was stale, invalidate the 1325 * lookup cache, just in case. 1326 */ 1327 error = ESTALE; 1328 cache_purge(NFSTOV(np)); 1329 break; 1330 1331 case NFSERR_REMOTE: 1332 error = EREMOTE; 1333 break; 1334 1335 case NFSERR_WFLUSH: 1336 case NFSERR_BADHANDLE: 1337 case NFSERR_NOT_SYNC: 1338 case NFSERR_BAD_COOKIE: 1339 error = EINVAL; 1340 break; 1341 1342 case NFSERR_NOTSUPP: 1343 error = ENOTSUP; 1344 break; 1345 1346 case NFSERR_TOOSMALL: 1347 case NFSERR_SERVERFAULT: 1348 case NFSERR_BADTYPE: 1349 error = EINVAL; 1350 break; 1351 1352 case NFSERR_TRYLATER: 1353 if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) 1354 break; 1355 m_freem(mrep); 1356 error = 0; 1357 waituntil = time_second + trylater_delay; 1358 while (time_second < waituntil) { 1359 kpause("nfstrylater", false, hz, NULL); 1360 } 1361 trylater_delay *= NFS_TRYLATERDELMUL; 1362 if (trylater_delay > NFS_TRYLATERDELMAX) 1363 trylater_delay = NFS_TRYLATERDELMAX; 1364 /* 1365 * RFC1813: 1366 * The client should wait and then try 1367 * the request with a new RPC transaction ID. 1368 */ 1369 nfs_renewxid(rep); 1370 goto tryagain; 1371 1372 default: 1373 #ifdef DIAGNOSTIC 1374 printf("Invalid rpc error code %d\n", error); 1375 #endif 1376 error = EINVAL; 1377 break; 1378 } 1379 1380 if (nmp->nm_flag & NFSMNT_NFSV3) { 1381 *mrp = mrep; 1382 *mdp = md; 1383 *dposp = dpos; 1384 error |= NFSERR_RETERR; 1385 } else 1386 m_freem(mrep); 1387 goto nfsmout; 1388 } 1389 1390 /* 1391 * note which credential worked to minimize number of retries. 1392 */ 1393 if (use_opencred) 1394 np->n_flag |= NUSEOPENCRED; 1395 else 1396 np->n_flag &= ~NUSEOPENCRED; 1397 1398 *mrp = mrep; 1399 *mdp = md; 1400 *dposp = dpos; 1401 1402 KASSERT(error == 0); 1403 goto nfsmout; 1404 } 1405 m_freem(mrep); 1406 error = EPROTONOSUPPORT; 1407 nfsmout: 1408 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1409 kauth_cred_free(acred); 1410 m_freem(rep->r_mreq); 1411 kmem_free(rep, sizeof(*rep)); 1412 m_freem(mrest_backup); 1413 return (error); 1414 } 1415 #endif /* NFS */ 1416 1417 /* 1418 * Generate the rpc reply header 1419 * siz arg. is used to decide if adding a cluster is worthwhile 1420 */ 1421 int 1422 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) 1423 { 1424 u_int32_t *tl; 1425 struct mbuf *mreq; 1426 char *bpos; 1427 struct mbuf *mb; 1428 1429 mreq = m_gethdr(M_WAIT, MT_DATA); 1430 MCLAIM(mreq, &nfs_mowner); 1431 mb = mreq; 1432 /* 1433 * If this is a big reply, use a cluster else 1434 * try and leave leading space for the lower level headers. 1435 */ 1436 siz += RPC_REPLYSIZ; 1437 if (siz >= max_datalen) { 1438 m_clget(mreq, M_WAIT); 1439 } else 1440 mreq->m_data += max_hdr; 1441 tl = mtod(mreq, u_int32_t *); 1442 mreq->m_len = 6 * NFSX_UNSIGNED; 1443 bpos = ((char *)tl) + mreq->m_len; 1444 *tl++ = txdr_unsigned(nd->nd_retxid); 1445 *tl++ = rpc_reply; 1446 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1447 *tl++ = rpc_msgdenied; 1448 if (err & NFSERR_AUTHERR) { 1449 *tl++ = rpc_autherr; 1450 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1451 mreq->m_len -= NFSX_UNSIGNED; 1452 bpos -= NFSX_UNSIGNED; 1453 } else { 1454 *tl++ = rpc_mismatch; 1455 *tl++ = txdr_unsigned(RPC_VER2); 1456 *tl = txdr_unsigned(RPC_VER2); 1457 } 1458 } else { 1459 *tl++ = rpc_msgaccepted; 1460 1461 /* 1462 * For Kerberos authentication, we must send the nickname 1463 * verifier back, otherwise just RPCAUTH_NULL. 1464 */ 1465 if (nd->nd_flag & ND_KERBFULL) { 1466 struct nfsuid *nuidp; 1467 struct timeval ktvin, ktvout; 1468 1469 memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ 1470 1471 LIST_FOREACH(nuidp, 1472 NUIDHASH(slp, kauth_cred_geteuid(nd->nd_cr)), 1473 nu_hash) { 1474 if (kauth_cred_geteuid(nuidp->nu_cr) == 1475 kauth_cred_geteuid(nd->nd_cr) && 1476 (!nd->nd_nam2 || netaddr_match( 1477 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1478 nd->nd_nam2))) 1479 break; 1480 } 1481 if (nuidp) { 1482 ktvin.tv_sec = 1483 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1484 - 1); 1485 ktvin.tv_usec = 1486 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1487 1488 /* 1489 * Encrypt the timestamp in ecb mode using the 1490 * session key. 1491 */ 1492 #ifdef NFSKERB 1493 XXX 1494 #endif 1495 1496 *tl++ = rpc_auth_kerb; 1497 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1498 *tl = ktvout.tv_sec; 1499 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1500 *tl++ = ktvout.tv_usec; 1501 *tl++ = txdr_unsigned( 1502 kauth_cred_geteuid(nuidp->nu_cr)); 1503 } else { 1504 *tl++ = 0; 1505 *tl++ = 0; 1506 } 1507 } else { 1508 *tl++ = 0; 1509 *tl++ = 0; 1510 } 1511 switch (err) { 1512 case EPROGUNAVAIL: 1513 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1514 break; 1515 case EPROGMISMATCH: 1516 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1517 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1518 *tl++ = txdr_unsigned(2); 1519 *tl = txdr_unsigned(3); 1520 break; 1521 case EPROCUNAVAIL: 1522 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1523 break; 1524 case EBADRPC: 1525 *tl = txdr_unsigned(RPC_GARBAGE); 1526 break; 1527 default: 1528 *tl = 0; 1529 if (err != NFSERR_RETVOID) { 1530 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1531 if (err) 1532 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1533 else 1534 *tl = 0; 1535 } 1536 break; 1537 }; 1538 } 1539 1540 if (mrq != NULL) 1541 *mrq = mreq; 1542 *mbp = mb; 1543 *bposp = bpos; 1544 if (err != 0 && err != NFSERR_RETVOID) 1545 nfsstats.srvrpc_errs++; 1546 return (0); 1547 } 1548 1549 static void 1550 nfs_timer_schedule(void) 1551 { 1552 1553 callout_schedule(&nfs_timer_ch, nfs_ticks); 1554 } 1555 1556 void 1557 nfs_timer_start(void) 1558 { 1559 1560 if (callout_pending(&nfs_timer_ch)) 1561 return; 1562 1563 nfs_timer_start_ev.ev_count++; 1564 nfs_timer_schedule(); 1565 } 1566 1567 void 1568 nfs_timer_init(void) 1569 { 1570 1571 mutex_init(&nfs_timer_lock, MUTEX_DEFAULT, IPL_NONE); 1572 callout_init(&nfs_timer_ch, 0); 1573 callout_setfunc(&nfs_timer_ch, nfs_timer, NULL); 1574 evcnt_attach_dynamic(&nfs_timer_ev, EVCNT_TYPE_MISC, NULL, 1575 "nfs", "timer"); 1576 evcnt_attach_dynamic(&nfs_timer_start_ev, EVCNT_TYPE_MISC, NULL, 1577 "nfs", "timer start"); 1578 evcnt_attach_dynamic(&nfs_timer_stop_ev, EVCNT_TYPE_MISC, NULL, 1579 "nfs", "timer stop"); 1580 } 1581 1582 void 1583 nfs_timer_fini(void) 1584 { 1585 1586 callout_halt(&nfs_timer_ch, NULL); 1587 callout_destroy(&nfs_timer_ch); 1588 mutex_destroy(&nfs_timer_lock); 1589 evcnt_detach(&nfs_timer_ev); 1590 evcnt_detach(&nfs_timer_start_ev); 1591 evcnt_detach(&nfs_timer_stop_ev); 1592 } 1593 1594 void 1595 nfs_timer_srvinit(bool (*func)(void)) 1596 { 1597 1598 nfs_timer_srvvec = func; 1599 } 1600 1601 void 1602 nfs_timer_srvfini(void) 1603 { 1604 1605 mutex_enter(&nfs_timer_lock); 1606 nfs_timer_srvvec = NULL; 1607 mutex_exit(&nfs_timer_lock); 1608 } 1609 1610 1611 /* 1612 * Nfs timer routine 1613 * Scan the nfsreq list and retranmit any requests that have timed out 1614 * To avoid retransmission attempts on STREAM sockets (in the future) make 1615 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1616 */ 1617 void 1618 nfs_timer(void *arg) 1619 { 1620 struct nfsreq *rep; 1621 struct mbuf *m; 1622 struct socket *so; 1623 struct nfsmount *nmp; 1624 int timeo; 1625 int error; 1626 bool more = false; 1627 1628 nfs_timer_ev.ev_count++; 1629 1630 mutex_enter(softnet_lock); /* XXX PR 40491 */ 1631 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1632 more = true; 1633 nmp = rep->r_nmp; 1634 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1635 continue; 1636 if (nfs_sigintr(nmp, rep, rep->r_lwp)) { 1637 rep->r_flags |= R_SOFTTERM; 1638 continue; 1639 } 1640 if (rep->r_rtt >= 0) { 1641 rep->r_rtt++; 1642 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1643 timeo = nmp->nm_timeo; 1644 else 1645 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1646 if (nmp->nm_timeouts > 0) 1647 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1648 if (timeo > NFS_MAXTIMEO) 1649 timeo = NFS_MAXTIMEO; 1650 if (rep->r_rtt <= timeo) 1651 continue; 1652 if (nmp->nm_timeouts < 1653 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1654 nmp->nm_timeouts++; 1655 } 1656 /* 1657 * Check for server not responding 1658 */ 1659 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1660 rep->r_rexmit > nmp->nm_deadthresh) { 1661 nfs_msg(rep->r_lwp, 1662 nmp->nm_mountp->mnt_stat.f_mntfromname, 1663 "not responding"); 1664 rep->r_flags |= R_TPRINTFMSG; 1665 } 1666 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1667 nfsstats.rpctimeouts++; 1668 rep->r_flags |= R_SOFTTERM; 1669 continue; 1670 } 1671 if (nmp->nm_sotype != SOCK_DGRAM) { 1672 if (++rep->r_rexmit > NFS_MAXREXMIT) 1673 rep->r_rexmit = NFS_MAXREXMIT; 1674 continue; 1675 } 1676 if ((so = nmp->nm_so) == NULL) 1677 continue; 1678 1679 /* 1680 * If there is enough space and the window allows.. 1681 * Resend it 1682 * Set r_rtt to -1 in case we fail to send it now. 1683 */ 1684 /* solock(so); XXX PR 40491 */ 1685 rep->r_rtt = -1; 1686 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1687 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1688 (rep->r_flags & R_SENT) || 1689 nmp->nm_sent < nmp->nm_cwnd) && 1690 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1691 if (so->so_state & SS_ISCONNECTED) 1692 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1693 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 1694 else 1695 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1696 nmp->nm_nam, (struct mbuf *)0, (struct lwp *)0); 1697 if (error) { 1698 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1699 #ifdef DEBUG 1700 if (ratecheck(&nfs_timer_last_err_time, 1701 &nfs_err_interval)) 1702 printf("%s: ignoring error " 1703 "%d\n", __func__, error); 1704 #endif 1705 so->so_error = 0; 1706 } 1707 } else { 1708 /* 1709 * Iff first send, start timing 1710 * else turn timing off, backoff timer 1711 * and divide congestion window by 2. 1712 */ 1713 if (rep->r_flags & R_SENT) { 1714 rep->r_flags &= ~R_TIMING; 1715 if (++rep->r_rexmit > NFS_MAXREXMIT) 1716 rep->r_rexmit = NFS_MAXREXMIT; 1717 nmp->nm_cwnd >>= 1; 1718 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1719 nmp->nm_cwnd = NFS_CWNDSCALE; 1720 nfsstats.rpcretries++; 1721 } else { 1722 rep->r_flags |= R_SENT; 1723 nmp->nm_sent += NFS_CWNDSCALE; 1724 } 1725 rep->r_rtt = 0; 1726 } 1727 } 1728 /* sounlock(so); XXX PR 40491 */ 1729 } 1730 mutex_exit(softnet_lock); /* XXX PR 40491 */ 1731 1732 mutex_enter(&nfs_timer_lock); 1733 if (nfs_timer_srvvec != NULL) { 1734 more |= (*nfs_timer_srvvec)(); 1735 } 1736 mutex_exit(&nfs_timer_lock); 1737 1738 if (more) { 1739 nfs_timer_schedule(); 1740 } else { 1741 nfs_timer_stop_ev.ev_count++; 1742 } 1743 } 1744 1745 /* 1746 * Test for a termination condition pending on the process. 1747 * This is used for NFSMNT_INT mounts. 1748 */ 1749 int 1750 nfs_sigintr(struct nfsmount *nmp, struct nfsreq *rep, struct lwp *l) 1751 { 1752 sigset_t ss; 1753 1754 if (rep && (rep->r_flags & R_SOFTTERM)) 1755 return (EINTR); 1756 if (!(nmp->nm_flag & NFSMNT_INT)) 1757 return (0); 1758 if (l) { 1759 sigpending1(l, &ss); 1760 #if 0 1761 sigminusset(&l->l_proc->p_sigctx.ps_sigignore, &ss); 1762 #endif 1763 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1764 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1765 sigismember(&ss, SIGQUIT)) 1766 return (EINTR); 1767 } 1768 return (0); 1769 } 1770 1771 #ifdef NFS 1772 /* 1773 * Lock a socket against others. 1774 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1775 * and also to avoid race conditions between the processes with nfs requests 1776 * in progress when a reconnect is necessary. 1777 */ 1778 static int 1779 nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) 1780 { 1781 struct lwp *l; 1782 int timeo = 0; 1783 bool catch = false; 1784 int error = 0; 1785 1786 if (rep) { 1787 l = rep->r_lwp; 1788 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1789 catch = true; 1790 } else 1791 l = NULL; 1792 mutex_enter(&nmp->nm_lock); 1793 while ((nmp->nm_iflag & NFSMNT_SNDLOCK) != 0) { 1794 if (rep && nfs_sigintr(rep->r_nmp, rep, l)) { 1795 error = EINTR; 1796 goto quit; 1797 } 1798 if (catch) { 1799 cv_timedwait_sig(&nmp->nm_sndcv, &nmp->nm_lock, timeo); 1800 } else { 1801 cv_timedwait(&nmp->nm_sndcv, &nmp->nm_lock, timeo); 1802 } 1803 if (catch) { 1804 catch = false; 1805 timeo = 2 * hz; 1806 } 1807 } 1808 nmp->nm_iflag |= NFSMNT_SNDLOCK; 1809 quit: 1810 mutex_exit(&nmp->nm_lock); 1811 return error; 1812 } 1813 1814 /* 1815 * Unlock the stream socket for others. 1816 */ 1817 static void 1818 nfs_sndunlock(struct nfsmount *nmp) 1819 { 1820 1821 mutex_enter(&nmp->nm_lock); 1822 if ((nmp->nm_iflag & NFSMNT_SNDLOCK) == 0) 1823 panic("nfs sndunlock"); 1824 nmp->nm_iflag &= ~NFSMNT_SNDLOCK; 1825 cv_signal(&nmp->nm_sndcv); 1826 mutex_exit(&nmp->nm_lock); 1827 } 1828 #endif /* NFS */ 1829 1830 static int 1831 nfs_rcvlock(struct nfsmount *nmp, struct nfsreq *rep) 1832 { 1833 int *flagp = &nmp->nm_iflag; 1834 int slptimeo = 0; 1835 bool catch; 1836 int error = 0; 1837 1838 KASSERT(nmp == rep->r_nmp); 1839 1840 catch = (nmp->nm_flag & NFSMNT_INT) != 0; 1841 mutex_enter(&nmp->nm_lock); 1842 while (/* CONSTCOND */ true) { 1843 if (*flagp & NFSMNT_DISMNT) { 1844 cv_signal(&nmp->nm_disconcv); 1845 error = EIO; 1846 break; 1847 } 1848 /* If our reply was received while we were sleeping, 1849 * then just return without taking the lock to avoid a 1850 * situation where a single iod could 'capture' the 1851 * receive lock. 1852 */ 1853 if (rep->r_mrep != NULL) { 1854 error = EALREADY; 1855 break; 1856 } 1857 if (nfs_sigintr(rep->r_nmp, rep, rep->r_lwp)) { 1858 error = EINTR; 1859 break; 1860 } 1861 if ((*flagp & NFSMNT_RCVLOCK) == 0) { 1862 *flagp |= NFSMNT_RCVLOCK; 1863 break; 1864 } 1865 if (catch) { 1866 cv_timedwait_sig(&nmp->nm_rcvcv, &nmp->nm_lock, 1867 slptimeo); 1868 } else { 1869 cv_timedwait(&nmp->nm_rcvcv, &nmp->nm_lock, 1870 slptimeo); 1871 } 1872 if (catch) { 1873 catch = false; 1874 slptimeo = 2 * hz; 1875 } 1876 } 1877 mutex_exit(&nmp->nm_lock); 1878 return error; 1879 } 1880 1881 /* 1882 * Unlock the stream socket for others. 1883 */ 1884 static void 1885 nfs_rcvunlock(struct nfsmount *nmp) 1886 { 1887 1888 mutex_enter(&nmp->nm_lock); 1889 if ((nmp->nm_iflag & NFSMNT_RCVLOCK) == 0) 1890 panic("nfs rcvunlock"); 1891 nmp->nm_iflag &= ~NFSMNT_RCVLOCK; 1892 cv_broadcast(&nmp->nm_rcvcv); 1893 mutex_exit(&nmp->nm_lock); 1894 } 1895 1896 /* 1897 * Parse an RPC request 1898 * - verify it 1899 * - allocate and fill in the cred. 1900 */ 1901 int 1902 nfs_getreq(struct nfsrv_descript *nd, struct nfsd *nfsd, int has_header) 1903 { 1904 int len, i; 1905 u_int32_t *tl; 1906 int32_t t1; 1907 struct uio uio; 1908 struct iovec iov; 1909 char *dpos, *cp2, *cp; 1910 u_int32_t nfsvers, auth_type; 1911 uid_t nickuid; 1912 int error = 0, ticklen; 1913 struct mbuf *mrep, *md; 1914 struct nfsuid *nuidp; 1915 struct timeval tvin, tvout; 1916 1917 memset(&tvout, 0, sizeof tvout); /* XXX gcc */ 1918 1919 KASSERT(nd->nd_cr == NULL); 1920 mrep = nd->nd_mrep; 1921 md = nd->nd_md; 1922 dpos = nd->nd_dpos; 1923 if (has_header) { 1924 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1925 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1926 if (*tl++ != rpc_call) { 1927 m_freem(mrep); 1928 return (EBADRPC); 1929 } 1930 } else 1931 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1932 nd->nd_repstat = 0; 1933 nd->nd_flag = 0; 1934 if (*tl++ != rpc_vers) { 1935 nd->nd_repstat = ERPCMISMATCH; 1936 nd->nd_procnum = NFSPROC_NOOP; 1937 return (0); 1938 } 1939 if (*tl != nfs_prog) { 1940 nd->nd_repstat = EPROGUNAVAIL; 1941 nd->nd_procnum = NFSPROC_NOOP; 1942 return (0); 1943 } 1944 tl++; 1945 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1946 if (nfsvers < NFS_VER2 || nfsvers > NFS_VER3) { 1947 nd->nd_repstat = EPROGMISMATCH; 1948 nd->nd_procnum = NFSPROC_NOOP; 1949 return (0); 1950 } 1951 if (nfsvers == NFS_VER3) 1952 nd->nd_flag = ND_NFSV3; 1953 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1954 if (nd->nd_procnum == NFSPROC_NULL) 1955 return (0); 1956 if (nd->nd_procnum > NFSPROC_COMMIT || 1957 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1958 nd->nd_repstat = EPROCUNAVAIL; 1959 nd->nd_procnum = NFSPROC_NOOP; 1960 return (0); 1961 } 1962 if ((nd->nd_flag & ND_NFSV3) == 0) 1963 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1964 auth_type = *tl++; 1965 len = fxdr_unsigned(int, *tl++); 1966 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1967 m_freem(mrep); 1968 return (EBADRPC); 1969 } 1970 1971 nd->nd_flag &= ~ND_KERBAUTH; 1972 /* 1973 * Handle auth_unix or auth_kerb. 1974 */ 1975 if (auth_type == rpc_auth_unix) { 1976 uid_t uid; 1977 gid_t gid; 1978 1979 nd->nd_cr = kauth_cred_alloc(); 1980 len = fxdr_unsigned(int, *++tl); 1981 if (len < 0 || len > NFS_MAXNAMLEN) { 1982 m_freem(mrep); 1983 error = EBADRPC; 1984 goto errout; 1985 } 1986 nfsm_adv(nfsm_rndup(len)); 1987 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1988 1989 uid = fxdr_unsigned(uid_t, *tl++); 1990 gid = fxdr_unsigned(gid_t, *tl++); 1991 kauth_cred_setuid(nd->nd_cr, uid); 1992 kauth_cred_seteuid(nd->nd_cr, uid); 1993 kauth_cred_setsvuid(nd->nd_cr, uid); 1994 kauth_cred_setgid(nd->nd_cr, gid); 1995 kauth_cred_setegid(nd->nd_cr, gid); 1996 kauth_cred_setsvgid(nd->nd_cr, gid); 1997 1998 len = fxdr_unsigned(int, *tl); 1999 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2000 m_freem(mrep); 2001 error = EBADRPC; 2002 goto errout; 2003 } 2004 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 2005 2006 if (len > 0) { 2007 size_t grbuf_size = min(len, NGROUPS) * sizeof(gid_t); 2008 gid_t *grbuf = kmem_alloc(grbuf_size, KM_SLEEP); 2009 2010 for (i = 0; i < len; i++) { 2011 if (i < NGROUPS) /* XXX elad */ 2012 grbuf[i] = fxdr_unsigned(gid_t, *tl++); 2013 else 2014 tl++; 2015 } 2016 kauth_cred_setgroups(nd->nd_cr, grbuf, 2017 min(len, NGROUPS), -1, UIO_SYSSPACE); 2018 kmem_free(grbuf, grbuf_size); 2019 } 2020 2021 len = fxdr_unsigned(int, *++tl); 2022 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2023 m_freem(mrep); 2024 error = EBADRPC; 2025 goto errout; 2026 } 2027 if (len > 0) 2028 nfsm_adv(nfsm_rndup(len)); 2029 } else if (auth_type == rpc_auth_kerb) { 2030 switch (fxdr_unsigned(int, *tl++)) { 2031 case RPCAKN_FULLNAME: 2032 ticklen = fxdr_unsigned(int, *tl); 2033 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2034 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2035 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2036 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2037 m_freem(mrep); 2038 error = EBADRPC; 2039 goto errout; 2040 } 2041 uio.uio_offset = 0; 2042 uio.uio_iov = &iov; 2043 uio.uio_iovcnt = 1; 2044 UIO_SETUP_SYSSPACE(&uio); 2045 iov.iov_base = (void *)&nfsd->nfsd_authstr[4]; 2046 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2047 nfsm_mtouio(&uio, uio.uio_resid); 2048 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2049 if (*tl++ != rpc_auth_kerb || 2050 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2051 printf("Bad kerb verifier\n"); 2052 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2053 nd->nd_procnum = NFSPROC_NOOP; 2054 return (0); 2055 } 2056 nfsm_dissect(cp, void *, 4 * NFSX_UNSIGNED); 2057 tl = (u_int32_t *)cp; 2058 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2059 printf("Not fullname kerb verifier\n"); 2060 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2061 nd->nd_procnum = NFSPROC_NOOP; 2062 return (0); 2063 } 2064 cp += NFSX_UNSIGNED; 2065 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 2066 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2067 nd->nd_flag |= ND_KERBFULL; 2068 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2069 break; 2070 case RPCAKN_NICKNAME: 2071 if (len != 2 * NFSX_UNSIGNED) { 2072 printf("Kerb nickname short\n"); 2073 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2074 nd->nd_procnum = NFSPROC_NOOP; 2075 return (0); 2076 } 2077 nickuid = fxdr_unsigned(uid_t, *tl); 2078 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2079 if (*tl++ != rpc_auth_kerb || 2080 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2081 printf("Kerb nick verifier bad\n"); 2082 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2083 nd->nd_procnum = NFSPROC_NOOP; 2084 return (0); 2085 } 2086 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2087 tvin.tv_sec = *tl++; 2088 tvin.tv_usec = *tl; 2089 2090 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 2091 nu_hash) { 2092 if (kauth_cred_geteuid(nuidp->nu_cr) == nickuid && 2093 (!nd->nd_nam2 || 2094 netaddr_match(NU_NETFAM(nuidp), 2095 &nuidp->nu_haddr, nd->nd_nam2))) 2096 break; 2097 } 2098 if (!nuidp) { 2099 nd->nd_repstat = 2100 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2101 nd->nd_procnum = NFSPROC_NOOP; 2102 return (0); 2103 } 2104 2105 /* 2106 * Now, decrypt the timestamp using the session key 2107 * and validate it. 2108 */ 2109 #ifdef NFSKERB 2110 XXX 2111 #endif 2112 2113 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2114 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2115 if (nuidp->nu_expire < time_second || 2116 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2117 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2118 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2119 nuidp->nu_expire = 0; 2120 nd->nd_repstat = 2121 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2122 nd->nd_procnum = NFSPROC_NOOP; 2123 return (0); 2124 } 2125 kauth_cred_hold(nuidp->nu_cr); 2126 nd->nd_cr = nuidp->nu_cr; 2127 nd->nd_flag |= ND_KERBNICK; 2128 } 2129 } else { 2130 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2131 nd->nd_procnum = NFSPROC_NOOP; 2132 return (0); 2133 } 2134 2135 nd->nd_md = md; 2136 nd->nd_dpos = dpos; 2137 KASSERT((nd->nd_cr == NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) != 0) 2138 || (nd->nd_cr != NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) == 0)); 2139 return (0); 2140 nfsmout: 2141 errout: 2142 KASSERT(error != 0); 2143 if (nd->nd_cr != NULL) { 2144 kauth_cred_free(nd->nd_cr); 2145 nd->nd_cr = NULL; 2146 } 2147 return (error); 2148 } 2149 2150 int 2151 nfs_msg(struct lwp *l, const char *server, const char *msg) 2152 { 2153 tpr_t tpr; 2154 2155 if (l) 2156 tpr = tprintf_open(l->l_proc); 2157 else 2158 tpr = NULL; 2159 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2160 tprintf_close(tpr); 2161 return (0); 2162 } 2163 2164 static struct pool nfs_srvdesc_pool; 2165 2166 void 2167 nfsdreq_init(void) 2168 { 2169 2170 pool_init(&nfs_srvdesc_pool, sizeof(struct nfsrv_descript), 2171 0, 0, 0, "nfsrvdescpl", &pool_allocator_nointr, IPL_NONE); 2172 } 2173 2174 void 2175 nfsdreq_fini(void) 2176 { 2177 2178 pool_destroy(&nfs_srvdesc_pool); 2179 } 2180 2181 struct nfsrv_descript * 2182 nfsdreq_alloc(void) 2183 { 2184 struct nfsrv_descript *nd; 2185 2186 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2187 nd->nd_cr = NULL; 2188 return nd; 2189 } 2190 2191 void 2192 nfsdreq_free(struct nfsrv_descript *nd) 2193 { 2194 kauth_cred_t cr; 2195 2196 cr = nd->nd_cr; 2197 if (cr != NULL) { 2198 kauth_cred_free(cr); 2199 } 2200 pool_put(&nfs_srvdesc_pool, nd); 2201 } 2202
Indexes created Sun Sep 21 20:09:37 GMT 2025