1 /* $NetBSD: nfs_socket.c,v 1.135 2006/06/07 22:34:17 kardel 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 1.135 2006/06/07 22:34:17 kardel Exp $"); 43 44 #include "fs_nfs.h" 45 #include "opt_nfs.h" 46 #include "opt_nfsserver.h" 47 #include "opt_mbuftrace.h" 48 #include "opt_inet.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/callout.h> 53 #include <sys/proc.h> 54 #include <sys/mount.h> 55 #include <sys/kernel.h> 56 #include <sys/mbuf.h> 57 #include <sys/vnode.h> 58 #include <sys/domain.h> 59 #include <sys/protosw.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/syslog.h> 63 #include <sys/tprintf.h> 64 #include <sys/namei.h> 65 #include <sys/signal.h> 66 #include <sys/signalvar.h> 67 #include <sys/kauth.h> 68 69 #include <netinet/in.h> 70 #include <netinet/tcp.h> 71 72 #include <nfs/rpcv2.h> 73 #include <nfs/nfsproto.h> 74 #include <nfs/nfs.h> 75 #include <nfs/xdr_subs.h> 76 #include <nfs/nfsm_subs.h> 77 #include <nfs/nfsmount.h> 78 #include <nfs/nfsnode.h> 79 #include <nfs/nfsrtt.h> 80 #include <nfs/nqnfs.h> 81 #include <nfs/nfs_var.h> 82 83 MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); 84 #ifdef MBUFTRACE 85 struct mowner nfs_mowner = { "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, nqnfs_prog; 114 extern time_t nqnfsstarttime; 115 extern const int nfsv3_procid[NFS_NPROCS]; 116 extern int nfs_ticks; 117 118 /* 119 * Defines which timer to use for the procnum. 120 * 0 - default 121 * 1 - getattr 122 * 2 - lookup 123 * 3 - read 124 * 4 - write 125 */ 126 static const int proct[NFS_NPROCS] = { 127 [NFSPROC_NULL] = 0, 128 [NFSPROC_GETATTR] = 1, 129 [NFSPROC_SETATTR] = 0, 130 [NFSPROC_LOOKUP] = 2, 131 [NFSPROC_ACCESS] = 1, 132 [NFSPROC_READLINK] = 3, 133 [NFSPROC_READ] = 3, 134 [NFSPROC_WRITE] = 4, 135 [NFSPROC_CREATE] = 0, 136 [NFSPROC_MKDIR] = 0, 137 [NFSPROC_SYMLINK] = 0, 138 [NFSPROC_MKNOD] = 0, 139 [NFSPROC_REMOVE] = 0, 140 [NFSPROC_RMDIR] = 0, 141 [NFSPROC_RENAME] = 0, 142 [NFSPROC_LINK] = 0, 143 [NFSPROC_READDIR] = 3, 144 [NFSPROC_READDIRPLUS] = 3, 145 [NFSPROC_FSSTAT] = 0, 146 [NFSPROC_FSINFO] = 0, 147 [NFSPROC_PATHCONF] = 0, 148 [NFSPROC_COMMIT] = 0, 149 [NQNFSPROC_GETLEASE] = 0, 150 [NQNFSPROC_VACATED] = 0, 151 [NQNFSPROC_EVICTED] = 0, 152 [NFSPROC_NOOP] = 0, 153 }; 154 155 /* 156 * There is a congestion window for outstanding rpcs maintained per mount 157 * point. The cwnd size is adjusted in roughly the way that: 158 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 159 * SIGCOMM '88". ACM, August 1988. 160 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 161 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 162 * of rpcs is in progress. 163 * (The sent count and cwnd are scaled for integer arith.) 164 * Variants of "slow start" were tried and were found to be too much of a 165 * performance hit (ave. rtt 3 times larger), 166 * I suspect due to the large rtt that nfs rpcs have. 167 */ 168 #define NFS_CWNDSCALE 256 169 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 170 static const int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 171 int nfsrtton = 0; 172 struct nfsrtt nfsrtt; 173 struct nfsreqhead nfs_reqq; 174 175 struct callout nfs_timer_ch = CALLOUT_INITIALIZER_SETFUNC(nfs_timer, NULL); 176 177 /* 178 * Initialize sockets and congestion for a new NFS connection. 179 * We do not free the sockaddr if error. 180 */ 181 int 182 nfs_connect(nmp, rep, l) 183 struct nfsmount *nmp; 184 struct nfsreq *rep; 185 struct lwp *l; 186 { 187 struct socket *so; 188 int s, error, rcvreserve, sndreserve; 189 struct sockaddr *saddr; 190 struct sockaddr_in *sin; 191 #ifdef INET6 192 struct sockaddr_in6 *sin6; 193 #endif 194 struct mbuf *m; 195 196 nmp->nm_so = (struct socket *)0; 197 saddr = mtod(nmp->nm_nam, struct sockaddr *); 198 error = socreate(saddr->sa_family, &nmp->nm_so, 199 nmp->nm_sotype, nmp->nm_soproto, l); 200 if (error) 201 goto bad; 202 so = nmp->nm_so; 203 #ifdef MBUFTRACE 204 so->so_mowner = &nfs_mowner; 205 so->so_rcv.sb_mowner = &nfs_mowner; 206 so->so_snd.sb_mowner = &nfs_mowner; 207 #endif 208 nmp->nm_soflags = so->so_proto->pr_flags; 209 210 /* 211 * Some servers require that the client port be a reserved port number. 212 */ 213 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 214 m = m_get(M_WAIT, MT_SOOPTS); 215 MCLAIM(m, so->so_mowner); 216 *mtod(m, int32_t *) = IP_PORTRANGE_LOW; 217 m->m_len = sizeof(int32_t); 218 if ((error = sosetopt(so, IPPROTO_IP, IP_PORTRANGE, m))) 219 goto bad; 220 m = m_get(M_WAIT, MT_SONAME); 221 MCLAIM(m, so->so_mowner); 222 sin = mtod(m, struct sockaddr_in *); 223 sin->sin_len = m->m_len = sizeof (struct sockaddr_in); 224 sin->sin_family = AF_INET; 225 sin->sin_addr.s_addr = INADDR_ANY; 226 sin->sin_port = 0; 227 error = sobind(so, m, &lwp0); 228 m_freem(m); 229 if (error) 230 goto bad; 231 } 232 #ifdef INET6 233 if (saddr->sa_family == AF_INET6 && (nmp->nm_flag & NFSMNT_RESVPORT)) { 234 m = m_get(M_WAIT, MT_SOOPTS); 235 MCLAIM(m, so->so_mowner); 236 *mtod(m, int32_t *) = IPV6_PORTRANGE_LOW; 237 m->m_len = sizeof(int32_t); 238 if ((error = sosetopt(so, IPPROTO_IPV6, IPV6_PORTRANGE, m))) 239 goto bad; 240 m = m_get(M_WAIT, MT_SONAME); 241 MCLAIM(m, so->so_mowner); 242 sin6 = mtod(m, struct sockaddr_in6 *); 243 sin6->sin6_len = m->m_len = sizeof (struct sockaddr_in6); 244 sin6->sin6_family = AF_INET6; 245 sin6->sin6_addr = in6addr_any; 246 sin6->sin6_port = 0; 247 error = sobind(so, m, &lwp0); 248 m_freem(m); 249 if (error) 250 goto bad; 251 } 252 #endif 253 254 /* 255 * Protocols that do not require connections may be optionally left 256 * unconnected for servers that reply from a port other than NFS_PORT. 257 */ 258 if (nmp->nm_flag & NFSMNT_NOCONN) { 259 if (nmp->nm_soflags & PR_CONNREQUIRED) { 260 error = ENOTCONN; 261 goto bad; 262 } 263 } else { 264 error = soconnect(so, nmp->nm_nam, l); 265 if (error) 266 goto bad; 267 268 /* 269 * Wait for the connection to complete. Cribbed from the 270 * connect system call but with the wait timing out so 271 * that interruptible mounts don't hang here for a long time. 272 */ 273 s = splsoftnet(); 274 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 275 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 276 "nfscn1", 2 * hz); 277 if ((so->so_state & SS_ISCONNECTING) && 278 so->so_error == 0 && rep && 279 (error = nfs_sigintr(nmp, rep, rep->r_lwp)) != 0){ 280 so->so_state &= ~SS_ISCONNECTING; 281 splx(s); 282 goto bad; 283 } 284 } 285 if (so->so_error) { 286 error = so->so_error; 287 so->so_error = 0; 288 splx(s); 289 goto bad; 290 } 291 splx(s); 292 } 293 if (nmp->nm_flag & (NFSMNT_SOFT | NFSMNT_INT)) { 294 so->so_rcv.sb_timeo = (5 * hz); 295 so->so_snd.sb_timeo = (5 * hz); 296 } else { 297 /* 298 * enable receive timeout to detect server crash and reconnect. 299 * otherwise, we can be stuck in soreceive forever. 300 */ 301 so->so_rcv.sb_timeo = (5 * hz); 302 so->so_snd.sb_timeo = 0; 303 } 304 if (nmp->nm_sotype == SOCK_DGRAM) { 305 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 306 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 307 NFS_MAXPKTHDR) * 2; 308 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 309 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * 2; 310 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 311 NFS_MAXPKTHDR) * 2; 312 } else { 313 if (nmp->nm_sotype != SOCK_STREAM) 314 panic("nfscon sotype"); 315 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 316 m = m_get(M_WAIT, MT_SOOPTS); 317 MCLAIM(m, so->so_mowner); 318 *mtod(m, int32_t *) = 1; 319 m->m_len = sizeof(int32_t); 320 sosetopt(so, SOL_SOCKET, SO_KEEPALIVE, m); 321 } 322 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 323 m = m_get(M_WAIT, MT_SOOPTS); 324 MCLAIM(m, so->so_mowner); 325 *mtod(m, int32_t *) = 1; 326 m->m_len = sizeof(int32_t); 327 sosetopt(so, IPPROTO_TCP, TCP_NODELAY, m); 328 } 329 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 330 sizeof (u_int32_t)) * 2; 331 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 332 sizeof (u_int32_t)) * 2; 333 } 334 error = soreserve(so, sndreserve, rcvreserve); 335 if (error) 336 goto bad; 337 so->so_rcv.sb_flags |= SB_NOINTR; 338 so->so_snd.sb_flags |= SB_NOINTR; 339 340 /* Initialize other non-zero congestion variables */ 341 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = nmp->nm_srtt[3] = 342 NFS_TIMEO << 3; 343 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 344 nmp->nm_sdrtt[3] = 0; 345 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 346 nmp->nm_sent = 0; 347 nmp->nm_timeouts = 0; 348 return (0); 349 350 bad: 351 nfs_disconnect(nmp); 352 return (error); 353 } 354 355 /* 356 * Reconnect routine: 357 * Called when a connection is broken on a reliable protocol. 358 * - clean up the old socket 359 * - nfs_connect() again 360 * - set R_MUSTRESEND for all outstanding requests on mount point 361 * If this fails the mount point is DEAD! 362 * nb: Must be called with the nfs_sndlock() set on the mount point. 363 */ 364 int 365 nfs_reconnect(rep, l) 366 struct nfsreq *rep; 367 struct lwp *l; 368 { 369 struct nfsreq *rp; 370 struct nfsmount *nmp = rep->r_nmp; 371 int error; 372 373 nfs_disconnect(nmp); 374 while ((error = nfs_connect(nmp, rep, l)) != 0) { 375 if (error == EINTR || error == ERESTART) 376 return (EINTR); 377 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscn2", 0); 378 } 379 380 /* 381 * Loop through outstanding request list and fix up all requests 382 * on old socket. 383 */ 384 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 385 if (rp->r_nmp == nmp) { 386 if ((rp->r_flags & R_MUSTRESEND) == 0) 387 rp->r_flags |= R_MUSTRESEND | R_REXMITTED; 388 rp->r_rexmit = 0; 389 } 390 } 391 return (0); 392 } 393 394 /* 395 * NFS disconnect. Clean up and unlink. 396 */ 397 void 398 nfs_disconnect(nmp) 399 struct nfsmount *nmp; 400 { 401 struct socket *so; 402 int drain = 0; 403 404 if (nmp->nm_so) { 405 so = nmp->nm_so; 406 nmp->nm_so = (struct socket *)0; 407 soshutdown(so, 2); 408 drain = (nmp->nm_iflag & NFSMNT_DISMNT) != 0; 409 if (drain) { 410 /* 411 * soshutdown() above should wake up the current 412 * listener. 413 * Now wake up those waiting for the receive lock, and 414 * wait for them to go away unhappy, to prevent *nmp 415 * from evaporating while they're sleeping. 416 */ 417 while (nmp->nm_waiters > 0) { 418 wakeup (&nmp->nm_iflag); 419 (void) tsleep(&nmp->nm_waiters, PVFS, 420 "nfsdis", 0); 421 } 422 } 423 soclose(so); 424 } 425 #ifdef DIAGNOSTIC 426 if (drain && (nmp->nm_waiters > 0)) 427 panic("nfs_disconnect: waiters left after drain?"); 428 #endif 429 } 430 431 void 432 nfs_safedisconnect(nmp) 433 struct nfsmount *nmp; 434 { 435 struct nfsreq dummyreq; 436 437 memset(&dummyreq, 0, sizeof(dummyreq)); 438 dummyreq.r_nmp = nmp; 439 nfs_rcvlock(&dummyreq); /* XXX ignored error return */ 440 nfs_disconnect(nmp); 441 nfs_rcvunlock(nmp); 442 } 443 444 /* 445 * This is the nfs send routine. For connection based socket types, it 446 * must be called with an nfs_sndlock() on the socket. 447 * "rep == NULL" indicates that it has been called from a server. 448 * For the client side: 449 * - return EINTR if the RPC is terminated, 0 otherwise 450 * - set R_MUSTRESEND if the send fails for any reason 451 * - do any cleanup required by recoverable socket errors (? ? ?) 452 * For the server side: 453 * - return EINTR or ERESTART if interrupted by a signal 454 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 455 * - do any cleanup required by recoverable socket errors (? ? ?) 456 */ 457 int 458 nfs_send(so, nam, top, rep, l) 459 struct socket *so; 460 struct mbuf *nam; 461 struct mbuf *top; 462 struct nfsreq *rep; 463 struct lwp *l; 464 { 465 struct mbuf *sendnam; 466 int error, soflags, flags; 467 468 /* XXX nfs_doio()/nfs_request() calls with rep->r_lwp == NULL */ 469 if (l == NULL && rep->r_lwp == NULL) 470 l = curlwp; 471 472 if (rep) { 473 if (rep->r_flags & R_SOFTTERM) { 474 m_freem(top); 475 return (EINTR); 476 } 477 if ((so = rep->r_nmp->nm_so) == NULL) { 478 rep->r_flags |= R_MUSTRESEND; 479 m_freem(top); 480 return (0); 481 } 482 rep->r_flags &= ~R_MUSTRESEND; 483 soflags = rep->r_nmp->nm_soflags; 484 } else 485 soflags = so->so_proto->pr_flags; 486 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 487 sendnam = (struct mbuf *)0; 488 else 489 sendnam = nam; 490 if (so->so_type == SOCK_SEQPACKET) 491 flags = MSG_EOR; 492 else 493 flags = 0; 494 495 error = (*so->so_send)(so, sendnam, (struct uio *)0, top, 496 (struct mbuf *)0, flags, l); 497 if (error) { 498 if (rep) { 499 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 500 /* 501 * We're too fast for the network/driver, 502 * and UDP isn't flowcontrolled. 503 * We need to resend. This is not fatal, 504 * just try again. 505 * 506 * Could be smarter here by doing some sort 507 * of a backoff, but this is rare. 508 */ 509 rep->r_flags |= R_MUSTRESEND; 510 } else { 511 if (error != EPIPE) 512 log(LOG_INFO, 513 "nfs send error %d for %s\n", 514 error, 515 rep->r_nmp->nm_mountp-> 516 mnt_stat.f_mntfromname); 517 /* 518 * Deal with errors for the client side. 519 */ 520 if (rep->r_flags & R_SOFTTERM) 521 error = EINTR; 522 else 523 rep->r_flags |= R_MUSTRESEND; 524 } 525 } else { 526 /* 527 * See above. This error can happen under normal 528 * circumstances and the log is too noisy. 529 * The error will still show up in nfsstat. 530 */ 531 if (error != ENOBUFS || so->so_type != SOCK_DGRAM) 532 log(LOG_INFO, "nfsd send error %d\n", error); 533 } 534 535 /* 536 * Handle any recoverable (soft) socket errors here. (? ? ?) 537 */ 538 if (error != EINTR && error != ERESTART && 539 error != EWOULDBLOCK && error != EPIPE) 540 error = 0; 541 } 542 return (error); 543 } 544 545 #ifdef NFS 546 /* 547 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 548 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 549 * Mark and consolidate the data into a new mbuf list. 550 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 551 * small mbufs. 552 * For SOCK_STREAM we must be very careful to read an entire record once 553 * we have read any of it, even if the system call has been interrupted. 554 */ 555 int 556 nfs_receive(rep, aname, mp, l) 557 struct nfsreq *rep; 558 struct mbuf **aname; 559 struct mbuf **mp; 560 struct lwp *l; 561 { 562 struct socket *so; 563 struct uio auio; 564 struct iovec aio; 565 struct mbuf *m; 566 struct mbuf *control; 567 u_int32_t len; 568 struct mbuf **getnam; 569 int error, sotype, rcvflg; 570 571 /* 572 * Set up arguments for soreceive() 573 */ 574 *mp = (struct mbuf *)0; 575 *aname = (struct mbuf *)0; 576 sotype = rep->r_nmp->nm_sotype; 577 578 /* 579 * For reliable protocols, lock against other senders/receivers 580 * in case a reconnect is necessary. 581 * For SOCK_STREAM, first get the Record Mark to find out how much 582 * more there is to get. 583 * We must lock the socket against other receivers 584 * until we have an entire rpc request/reply. 585 */ 586 if (sotype != SOCK_DGRAM) { 587 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 588 if (error) 589 return (error); 590 tryagain: 591 /* 592 * Check for fatal errors and resending request. 593 */ 594 /* 595 * Ugh: If a reconnect attempt just happened, nm_so 596 * would have changed. NULL indicates a failed 597 * attempt that has essentially shut down this 598 * mount point. 599 */ 600 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 601 nfs_sndunlock(&rep->r_nmp->nm_iflag); 602 return (EINTR); 603 } 604 so = rep->r_nmp->nm_so; 605 if (!so) { 606 error = nfs_reconnect(rep, l); 607 if (error) { 608 nfs_sndunlock(&rep->r_nmp->nm_iflag); 609 return (error); 610 } 611 goto tryagain; 612 } 613 while (rep->r_flags & R_MUSTRESEND) { 614 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 615 nfsstats.rpcretries++; 616 rep->r_rtt = 0; 617 rep->r_flags &= ~R_TIMING; 618 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, l); 619 if (error) { 620 if (error == EINTR || error == ERESTART || 621 (error = nfs_reconnect(rep, l)) != 0) { 622 nfs_sndunlock(&rep->r_nmp->nm_iflag); 623 return (error); 624 } 625 goto tryagain; 626 } 627 } 628 nfs_sndunlock(&rep->r_nmp->nm_iflag); 629 if (sotype == SOCK_STREAM) { 630 aio.iov_base = (caddr_t) &len; 631 aio.iov_len = sizeof(u_int32_t); 632 auio.uio_iov = &aio; 633 auio.uio_iovcnt = 1; 634 auio.uio_rw = UIO_READ; 635 auio.uio_offset = 0; 636 auio.uio_resid = sizeof(u_int32_t); 637 UIO_SETUP_SYSSPACE(&auio); 638 do { 639 rcvflg = MSG_WAITALL; 640 error = (*so->so_receive)(so, (struct mbuf **)0, &auio, 641 (struct mbuf **)0, (struct mbuf **)0, &rcvflg); 642 if (error == EWOULDBLOCK && rep) { 643 if (rep->r_flags & R_SOFTTERM) 644 return (EINTR); 645 /* 646 * if it seems that the server died after it 647 * received our request, set EPIPE so that 648 * we'll reconnect and retransmit requests. 649 */ 650 if (rep->r_rexmit >= rep->r_nmp->nm_retry) { 651 nfsstats.rpctimeouts++; 652 error = EPIPE; 653 } 654 } 655 } while (error == EWOULDBLOCK); 656 if (!error && auio.uio_resid > 0) { 657 /* 658 * Don't log a 0 byte receive; it means 659 * that the socket has been closed, and 660 * can happen during normal operation 661 * (forcible unmount or Solaris server). 662 */ 663 if (auio.uio_resid != sizeof (u_int32_t)) 664 log(LOG_INFO, 665 "short receive (%lu/%lu) from nfs server %s\n", 666 (u_long)sizeof(u_int32_t) - auio.uio_resid, 667 (u_long)sizeof(u_int32_t), 668 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 669 error = EPIPE; 670 } 671 if (error) 672 goto errout; 673 len = ntohl(len) & ~0x80000000; 674 /* 675 * This is SERIOUS! We are out of sync with the sender 676 * and forcing a disconnect/reconnect is all I can do. 677 */ 678 if (len > NFS_MAXPACKET) { 679 log(LOG_ERR, "%s (%d) from nfs server %s\n", 680 "impossible packet length", 681 len, 682 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 683 error = EFBIG; 684 goto errout; 685 } 686 auio.uio_resid = len; 687 do { 688 rcvflg = MSG_WAITALL; 689 error = (*so->so_receive)(so, (struct mbuf **)0, 690 &auio, mp, (struct mbuf **)0, &rcvflg); 691 } while (error == EWOULDBLOCK || error == EINTR || 692 error == ERESTART); 693 if (!error && auio.uio_resid > 0) { 694 if (len != auio.uio_resid) 695 log(LOG_INFO, 696 "short receive (%lu/%d) from nfs server %s\n", 697 (u_long)len - auio.uio_resid, len, 698 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 699 error = EPIPE; 700 } 701 } else { 702 /* 703 * NB: Since uio_resid is big, MSG_WAITALL is ignored 704 * and soreceive() will return when it has either a 705 * control msg or a data msg. 706 * We have no use for control msg., but must grab them 707 * and then throw them away so we know what is going 708 * on. 709 */ 710 auio.uio_resid = len = 100000000; /* Anything Big */ 711 /* not need to setup uio_vmspace */ 712 do { 713 rcvflg = 0; 714 error = (*so->so_receive)(so, (struct mbuf **)0, 715 &auio, mp, &control, &rcvflg); 716 if (control) 717 m_freem(control); 718 if (error == EWOULDBLOCK && rep) { 719 if (rep->r_flags & R_SOFTTERM) 720 return (EINTR); 721 } 722 } while (error == EWOULDBLOCK || 723 (!error && *mp == NULL && control)); 724 if ((rcvflg & MSG_EOR) == 0) 725 printf("Egad!!\n"); 726 if (!error && *mp == NULL) 727 error = EPIPE; 728 len -= auio.uio_resid; 729 } 730 errout: 731 if (error && error != EINTR && error != ERESTART) { 732 m_freem(*mp); 733 *mp = (struct mbuf *)0; 734 if (error != EPIPE) 735 log(LOG_INFO, 736 "receive error %d from nfs server %s\n", 737 error, 738 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 739 error = nfs_sndlock(&rep->r_nmp->nm_iflag, rep); 740 if (!error) 741 error = nfs_reconnect(rep, l); 742 if (!error) 743 goto tryagain; 744 else 745 nfs_sndunlock(&rep->r_nmp->nm_iflag); 746 } 747 } else { 748 if ((so = rep->r_nmp->nm_so) == NULL) 749 return (EACCES); 750 if (so->so_state & SS_ISCONNECTED) 751 getnam = (struct mbuf **)0; 752 else 753 getnam = aname; 754 auio.uio_resid = len = 1000000; 755 /* not need to setup uio_vmspace */ 756 do { 757 rcvflg = 0; 758 error = (*so->so_receive)(so, getnam, &auio, mp, 759 (struct mbuf **)0, &rcvflg); 760 if (error == EWOULDBLOCK && 761 (rep->r_flags & R_SOFTTERM)) 762 return (EINTR); 763 } while (error == EWOULDBLOCK); 764 len -= auio.uio_resid; 765 if (!error && *mp == NULL) 766 error = EPIPE; 767 } 768 if (error) { 769 m_freem(*mp); 770 *mp = (struct mbuf *)0; 771 } 772 return (error); 773 } 774 775 /* 776 * Implement receipt of reply on a socket. 777 * We must search through the list of received datagrams matching them 778 * with outstanding requests using the xid, until ours is found. 779 */ 780 /* ARGSUSED */ 781 int 782 nfs_reply(myrep, lwp) 783 struct nfsreq *myrep; 784 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 caddr_t 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(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 nmp->nm_waiters++; 813 error = nfs_receive(myrep, &nam, &mrep, lwp); 814 nfs_rcvunlock(nmp); 815 if (error) { 816 817 if (nmp->nm_iflag & NFSMNT_DISMNT) { 818 /* 819 * Oops, we're going away now.. 820 */ 821 nmp->nm_waiters--; 822 wakeup (&nmp->nm_waiters); 823 return error; 824 } 825 nmp->nm_waiters--; 826 /* 827 * Ignore routing errors on connectionless protocols? ? 828 */ 829 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 830 nmp->nm_so->so_error = 0; 831 #ifdef DEBUG 832 printf("nfs_reply: ignoring error %d\n", error); 833 #endif 834 if (myrep->r_flags & R_GETONEREP) 835 return (0); 836 continue; 837 } 838 return (error); 839 } 840 nmp->nm_waiters--; 841 if (nam) 842 m_freem(nam); 843 844 /* 845 * Get the xid and check that it is an rpc reply 846 */ 847 md = mrep; 848 dpos = mtod(md, caddr_t); 849 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 850 rxid = *tl++; 851 if (*tl != rpc_reply) { 852 #ifndef NFS_V2_ONLY 853 if (nmp->nm_flag & NFSMNT_NQNFS) { 854 if (nqnfs_callback(nmp, mrep, md, dpos, 855 myrep->r_lwp)) 856 nfsstats.rpcinvalid++; 857 } else 858 #endif 859 { 860 nfsstats.rpcinvalid++; 861 m_freem(mrep); 862 } 863 nfsmout: 864 if (myrep->r_flags & R_GETONEREP) 865 return (0); 866 continue; 867 } 868 869 /* 870 * Loop through the request list to match up the reply 871 * Iff no match, just drop the datagram 872 */ 873 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 874 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 875 /* Found it.. */ 876 rep->r_mrep = mrep; 877 rep->r_md = md; 878 rep->r_dpos = dpos; 879 if (nfsrtton) { 880 struct rttl *rt; 881 882 rt = &nfsrtt.rttl[nfsrtt.pos]; 883 rt->proc = rep->r_procnum; 884 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 885 rt->sent = nmp->nm_sent; 886 rt->cwnd = nmp->nm_cwnd; 887 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 888 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 889 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; 890 getmicrotime(&rt->tstamp); 891 if (rep->r_flags & R_TIMING) 892 rt->rtt = rep->r_rtt; 893 else 894 rt->rtt = 1000000; 895 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 896 } 897 /* 898 * Update congestion window. 899 * Do the additive increase of 900 * one rpc/rtt. 901 */ 902 if (nmp->nm_cwnd <= nmp->nm_sent) { 903 nmp->nm_cwnd += 904 (NFS_CWNDSCALE * NFS_CWNDSCALE + 905 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 906 if (nmp->nm_cwnd > NFS_MAXCWND) 907 nmp->nm_cwnd = NFS_MAXCWND; 908 } 909 rep->r_flags &= ~R_SENT; 910 nmp->nm_sent -= NFS_CWNDSCALE; 911 /* 912 * Update rtt using a gain of 0.125 on the mean 913 * and a gain of 0.25 on the deviation. 914 */ 915 if (rep->r_flags & R_TIMING) { 916 /* 917 * Since the timer resolution of 918 * NFS_HZ is so course, it can often 919 * result in r_rtt == 0. Since 920 * r_rtt == N means that the actual 921 * rtt is between N+dt and N+2-dt ticks, 922 * add 1. 923 */ 924 t1 = rep->r_rtt + 1; 925 t1 -= (NFS_SRTT(rep) >> 3); 926 NFS_SRTT(rep) += t1; 927 if (t1 < 0) 928 t1 = -t1; 929 t1 -= (NFS_SDRTT(rep) >> 2); 930 NFS_SDRTT(rep) += t1; 931 } 932 nmp->nm_timeouts = 0; 933 break; 934 } 935 } 936 /* 937 * If not matched to a request, drop it. 938 * If it's mine, get out. 939 */ 940 if (rep == 0) { 941 nfsstats.rpcunexpected++; 942 m_freem(mrep); 943 } else if (rep == myrep) { 944 if (rep->r_mrep == NULL) 945 panic("nfsreply nil"); 946 return (0); 947 } 948 if (myrep->r_flags & R_GETONEREP) 949 return (0); 950 } 951 } 952 953 /* 954 * nfs_request - goes something like this 955 * - fill in request struct 956 * - links it into list 957 * - calls nfs_send() for first transmit 958 * - calls nfs_receive() to get reply 959 * - break down rpc header and return with nfs reply pointed to 960 * by mrep or error 961 * nb: always frees up mreq mbuf list 962 */ 963 int 964 nfs_request(np, mrest, procnum, lwp, cred, mrp, mdp, dposp, rexmitp) 965 struct nfsnode *np; 966 struct mbuf *mrest; 967 int procnum; 968 struct lwp *lwp; 969 kauth_cred_t cred; 970 struct mbuf **mrp; 971 struct mbuf **mdp; 972 caddr_t *dposp; 973 int *rexmitp; 974 { 975 struct mbuf *m, *mrep; 976 struct nfsreq *rep; 977 u_int32_t *tl; 978 int i; 979 struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); 980 struct mbuf *md, *mheadend; 981 char nickv[RPCX_NICKVERF]; 982 time_t reqtime, waituntil; 983 caddr_t dpos, cp2; 984 int t1, s, error = 0, mrest_len, auth_len, auth_type; 985 int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; 986 int verf_len, verf_type; 987 u_int32_t xid; 988 char *auth_str, *verf_str; 989 NFSKERBKEY_T key; /* save session key */ 990 kauth_cred_t acred; 991 #ifndef NFS_V2_ONLY 992 int nqlflag, cachable; 993 u_quad_t frev; 994 #endif 995 struct mbuf *mrest_backup = NULL; 996 kauth_cred_t origcred = NULL; /* XXX: gcc */ 997 boolean_t retry_cred = TRUE; 998 boolean_t use_opencred = (np->n_flag & NUSEOPENCRED) != 0; 999 1000 if (rexmitp != NULL) 1001 *rexmitp = 0; 1002 1003 acred = kauth_cred_alloc(); 1004 1005 tryagain_cred: 1006 KASSERT(cred != NULL); 1007 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 1008 rep->r_nmp = nmp; 1009 rep->r_lwp = lwp; 1010 rep->r_procnum = procnum; 1011 i = 0; 1012 m = mrest; 1013 while (m) { 1014 i += m->m_len; 1015 m = m->m_next; 1016 } 1017 mrest_len = i; 1018 1019 /* 1020 * Get the RPC header with authorization. 1021 */ 1022 kerbauth: 1023 verf_str = auth_str = (char *)0; 1024 if (nmp->nm_flag & NFSMNT_KERB) { 1025 verf_str = nickv; 1026 verf_len = sizeof (nickv); 1027 auth_type = RPCAUTH_KERB4; 1028 memset((caddr_t)key, 0, sizeof (key)); 1029 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 1030 &auth_len, verf_str, verf_len)) { 1031 error = nfs_getauth(nmp, rep, cred, &auth_str, 1032 &auth_len, verf_str, &verf_len, key); 1033 if (error) { 1034 free((caddr_t)rep, M_NFSREQ); 1035 m_freem(mrest); 1036 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1037 kauth_cred_free(acred); 1038 return (error); 1039 } 1040 } 1041 retry_cred = FALSE; 1042 } else { 1043 /* AUTH_UNIX */ 1044 uid_t uid; 1045 gid_t gid; 1046 1047 /* 1048 * on the most unix filesystems, permission checks are 1049 * done when the file is open(2)'ed. 1050 * ie. once a file is successfully open'ed, 1051 * following i/o operations never fail with EACCES. 1052 * we try to follow the semantics as far as possible. 1053 * 1054 * note that we expect that the nfs server always grant 1055 * accesses by the file's owner. 1056 */ 1057 origcred = cred; 1058 switch (procnum) { 1059 case NFSPROC_READ: 1060 case NFSPROC_WRITE: 1061 case NFSPROC_COMMIT: 1062 uid = np->n_vattr->va_uid; 1063 gid = np->n_vattr->va_gid; 1064 if (kauth_cred_geteuid(cred) == uid && 1065 kauth_cred_getegid(cred) == gid) { 1066 retry_cred = FALSE; 1067 break; 1068 } 1069 if (use_opencred) 1070 break; 1071 kauth_cred_setuid(acred, uid); 1072 kauth_cred_seteuid(acred, uid); 1073 kauth_cred_setsvuid(acred, uid); 1074 kauth_cred_setgid(acred, gid); 1075 kauth_cred_setegid(acred, gid); 1076 kauth_cred_setsvgid(acred, gid); 1077 cred = acred; 1078 break; 1079 default: 1080 retry_cred = FALSE; 1081 break; 1082 } 1083 /* 1084 * backup mbuf chain if we can need it later to retry. 1085 * 1086 * XXX maybe we can keep a direct reference to 1087 * mrest without doing m_copym, but it's ...ugly. 1088 */ 1089 if (retry_cred) 1090 mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); 1091 auth_type = RPCAUTH_UNIX; 1092 /* XXX elad - ngroups */ 1093 auth_len = (((kauth_cred_ngroups(cred) > nmp->nm_numgrps) ? 1094 nmp->nm_numgrps : kauth_cred_ngroups(cred)) << 2) + 1095 5 * NFSX_UNSIGNED; 1096 } 1097 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1098 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); 1099 if (auth_str) 1100 free(auth_str, M_TEMP); 1101 1102 /* 1103 * For stream protocols, insert a Sun RPC Record Mark. 1104 */ 1105 if (nmp->nm_sotype == SOCK_STREAM) { 1106 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1107 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1108 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1109 } 1110 rep->r_mreq = m; 1111 rep->r_xid = xid; 1112 tryagain: 1113 if (nmp->nm_flag & NFSMNT_SOFT) 1114 rep->r_retry = nmp->nm_retry; 1115 else 1116 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1117 rep->r_rtt = rep->r_rexmit = 0; 1118 if (proct[procnum] > 0) 1119 rep->r_flags = R_TIMING; 1120 else 1121 rep->r_flags = 0; 1122 rep->r_mrep = NULL; 1123 1124 /* 1125 * Do the client side RPC. 1126 */ 1127 nfsstats.rpcrequests++; 1128 /* 1129 * Chain request into list of outstanding requests. Be sure 1130 * to put it LAST so timer finds oldest requests first. 1131 */ 1132 s = splsoftnet(); 1133 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1134 1135 /* Get send time for nqnfs */ 1136 reqtime = time_second; 1137 1138 /* 1139 * If backing off another request or avoiding congestion, don't 1140 * send this one now but let timer do it. If not timing a request, 1141 * do it now. 1142 */ 1143 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1144 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1145 nmp->nm_sent < nmp->nm_cwnd)) { 1146 splx(s); 1147 if (nmp->nm_soflags & PR_CONNREQUIRED) 1148 error = nfs_sndlock(&nmp->nm_iflag, rep); 1149 if (!error) { 1150 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 1151 error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, lwp); 1152 if (nmp->nm_soflags & PR_CONNREQUIRED) 1153 nfs_sndunlock(&nmp->nm_iflag); 1154 } 1155 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1156 nmp->nm_sent += NFS_CWNDSCALE; 1157 rep->r_flags |= R_SENT; 1158 } 1159 } else { 1160 splx(s); 1161 rep->r_rtt = -1; 1162 } 1163 1164 /* 1165 * Wait for the reply from our send or the timer's. 1166 */ 1167 if (!error || error == EPIPE) 1168 error = nfs_reply(rep, lwp); 1169 1170 /* 1171 * RPC done, unlink the request. 1172 */ 1173 s = splsoftnet(); 1174 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1175 splx(s); 1176 1177 /* 1178 * Decrement the outstanding request count. 1179 */ 1180 if (rep->r_flags & R_SENT) { 1181 rep->r_flags &= ~R_SENT; /* paranoia */ 1182 nmp->nm_sent -= NFS_CWNDSCALE; 1183 } 1184 1185 if (rexmitp != NULL) { 1186 int rexmit; 1187 1188 if (nmp->nm_sotype != SOCK_DGRAM) 1189 rexmit = (rep->r_flags & R_REXMITTED) != 0; 1190 else 1191 rexmit = rep->r_rexmit; 1192 *rexmitp = rexmit; 1193 } 1194 1195 /* 1196 * If there was a successful reply and a tprintf msg. 1197 * tprintf a response. 1198 */ 1199 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1200 nfs_msg(rep->r_lwp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1201 "is alive again"); 1202 mrep = rep->r_mrep; 1203 md = rep->r_md; 1204 dpos = rep->r_dpos; 1205 if (error) 1206 goto nfsmout; 1207 1208 /* 1209 * break down the rpc header and check if ok 1210 */ 1211 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1212 if (*tl++ == rpc_msgdenied) { 1213 if (*tl == rpc_mismatch) 1214 error = EOPNOTSUPP; 1215 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1216 if (!failed_auth) { 1217 failed_auth++; 1218 mheadend->m_next = (struct mbuf *)0; 1219 m_freem(mrep); 1220 m_freem(rep->r_mreq); 1221 goto kerbauth; 1222 } else 1223 error = EAUTH; 1224 } else 1225 error = EACCES; 1226 m_freem(mrep); 1227 goto nfsmout; 1228 } 1229 1230 /* 1231 * Grab any Kerberos verifier, otherwise just throw it away. 1232 */ 1233 verf_type = fxdr_unsigned(int, *tl++); 1234 i = fxdr_unsigned(int32_t, *tl); 1235 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1236 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1237 if (error) 1238 goto nfsmout; 1239 } else if (i > 0) 1240 nfsm_adv(nfsm_rndup(i)); 1241 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1242 /* 0 == ok */ 1243 if (*tl == 0) { 1244 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1245 if (*tl != 0) { 1246 error = fxdr_unsigned(int, *tl); 1247 switch (error) { 1248 case NFSERR_PERM: 1249 error = EPERM; 1250 break; 1251 1252 case NFSERR_NOENT: 1253 error = ENOENT; 1254 break; 1255 1256 case NFSERR_IO: 1257 error = EIO; 1258 break; 1259 1260 case NFSERR_NXIO: 1261 error = ENXIO; 1262 break; 1263 1264 case NFSERR_ACCES: 1265 error = EACCES; 1266 if (!retry_cred) 1267 break; 1268 m_freem(mrep); 1269 m_freem(rep->r_mreq); 1270 FREE(rep, M_NFSREQ); 1271 use_opencred = !use_opencred; 1272 if (mrest_backup == NULL) { 1273 /* m_copym failure */ 1274 KASSERT( 1275 kauth_cred_getrefcnt(acred) == 1); 1276 kauth_cred_free(acred); 1277 return ENOMEM; 1278 } 1279 mrest = mrest_backup; 1280 mrest_backup = NULL; 1281 cred = origcred; 1282 error = 0; 1283 retry_cred = FALSE; 1284 goto tryagain_cred; 1285 1286 case NFSERR_EXIST: 1287 error = EEXIST; 1288 break; 1289 1290 case NFSERR_XDEV: 1291 error = EXDEV; 1292 break; 1293 1294 case NFSERR_NODEV: 1295 error = ENODEV; 1296 break; 1297 1298 case NFSERR_NOTDIR: 1299 error = ENOTDIR; 1300 break; 1301 1302 case NFSERR_ISDIR: 1303 error = EISDIR; 1304 break; 1305 1306 case NFSERR_INVAL: 1307 error = EINVAL; 1308 break; 1309 1310 case NFSERR_FBIG: 1311 error = EFBIG; 1312 break; 1313 1314 case NFSERR_NOSPC: 1315 error = ENOSPC; 1316 break; 1317 1318 case NFSERR_ROFS: 1319 error = EROFS; 1320 break; 1321 1322 case NFSERR_MLINK: 1323 error = EMLINK; 1324 break; 1325 1326 case NFSERR_TIMEDOUT: 1327 error = ETIMEDOUT; 1328 break; 1329 1330 case NFSERR_NAMETOL: 1331 error = ENAMETOOLONG; 1332 break; 1333 1334 case NFSERR_NOTEMPTY: 1335 error = ENOTEMPTY; 1336 break; 1337 1338 case NFSERR_DQUOT: 1339 error = EDQUOT; 1340 break; 1341 1342 case NFSERR_STALE: 1343 /* 1344 * If the File Handle was stale, invalidate the 1345 * lookup cache, just in case. 1346 */ 1347 error = ESTALE; 1348 cache_purge(NFSTOV(np)); 1349 break; 1350 1351 case NFSERR_REMOTE: 1352 error = EREMOTE; 1353 break; 1354 1355 case NFSERR_WFLUSH: 1356 case NFSERR_BADHANDLE: 1357 case NFSERR_NOT_SYNC: 1358 case NFSERR_BAD_COOKIE: 1359 error = EINVAL; 1360 break; 1361 1362 case NFSERR_NOTSUPP: 1363 error = ENOTSUP; 1364 break; 1365 1366 case NFSERR_TOOSMALL: 1367 case NFSERR_SERVERFAULT: 1368 case NFSERR_BADTYPE: 1369 error = EINVAL; 1370 break; 1371 1372 case NFSERR_TRYLATER: 1373 if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) 1374 break; 1375 m_freem(mrep); 1376 error = 0; 1377 waituntil = time_second + trylater_delay; 1378 while (time_second < waituntil) 1379 (void) tsleep((caddr_t)&lbolt, 1380 PSOCK, "nqnfstry", 0); 1381 trylater_delay *= NFS_TRYLATERDELMUL; 1382 if (trylater_delay > NFS_TRYLATERDELMAX) 1383 trylater_delay = NFS_TRYLATERDELMAX; 1384 /* 1385 * RFC1813: 1386 * The client should wait and then try 1387 * the request with a new RPC transaction ID. 1388 */ 1389 nfs_renewxid(rep); 1390 goto tryagain; 1391 1392 case NFSERR_STALEWRITEVERF: 1393 error = EINVAL; 1394 break; 1395 1396 default: 1397 #ifdef DIAGNOSTIC 1398 printf("Invalid rpc error code %d\n", error); 1399 #endif 1400 error = EINVAL; 1401 break; 1402 } 1403 1404 if (nmp->nm_flag & NFSMNT_NFSV3) { 1405 *mrp = mrep; 1406 *mdp = md; 1407 *dposp = dpos; 1408 error |= NFSERR_RETERR; 1409 } else 1410 m_freem(mrep); 1411 goto nfsmout; 1412 } 1413 1414 /* 1415 * note which credential worked to minimize number of retries. 1416 */ 1417 if (use_opencred) 1418 np->n_flag |= NUSEOPENCRED; 1419 else 1420 np->n_flag &= ~NUSEOPENCRED; 1421 1422 #ifndef NFS_V2_ONLY 1423 /* 1424 * For nqnfs, get any lease in reply 1425 */ 1426 if (nmp->nm_flag & NFSMNT_NQNFS) { 1427 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1428 if (*tl) { 1429 nqlflag = fxdr_unsigned(int, *tl); 1430 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1431 cachable = fxdr_unsigned(int, *tl++); 1432 reqtime += fxdr_unsigned(int, *tl++); 1433 if (reqtime > time_second) { 1434 frev = fxdr_hyper(tl); 1435 nqnfs_clientlease(nmp, np, nqlflag, 1436 cachable, reqtime, frev); 1437 } 1438 } 1439 } 1440 #endif 1441 *mrp = mrep; 1442 *mdp = md; 1443 *dposp = dpos; 1444 1445 KASSERT(error == 0); 1446 goto nfsmout; 1447 } 1448 m_freem(mrep); 1449 error = EPROTONOSUPPORT; 1450 nfsmout: 1451 KASSERT(kauth_cred_getrefcnt(acred) == 1); 1452 kauth_cred_free(acred); 1453 m_freem(rep->r_mreq); 1454 free((caddr_t)rep, M_NFSREQ); 1455 m_freem(mrest_backup); 1456 return (error); 1457 } 1458 #endif /* NFS */ 1459 1460 /* 1461 * Generate the rpc reply header 1462 * siz arg. is used to decide if adding a cluster is worthwhile 1463 */ 1464 int 1465 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1466 int siz; 1467 struct nfsrv_descript *nd; 1468 struct nfssvc_sock *slp; 1469 int err; 1470 int cache; 1471 u_quad_t *frev; 1472 struct mbuf **mrq; 1473 struct mbuf **mbp; 1474 caddr_t *bposp; 1475 { 1476 u_int32_t *tl; 1477 struct mbuf *mreq; 1478 caddr_t bpos; 1479 struct mbuf *mb; 1480 1481 mreq = m_gethdr(M_WAIT, MT_DATA); 1482 MCLAIM(mreq, &nfs_mowner); 1483 mb = mreq; 1484 /* 1485 * If this is a big reply, use a cluster else 1486 * try and leave leading space for the lower level headers. 1487 */ 1488 siz += RPC_REPLYSIZ; 1489 if (siz >= max_datalen) { 1490 m_clget(mreq, M_WAIT); 1491 } else 1492 mreq->m_data += max_hdr; 1493 tl = mtod(mreq, u_int32_t *); 1494 mreq->m_len = 6 * NFSX_UNSIGNED; 1495 bpos = ((caddr_t)tl) + mreq->m_len; 1496 *tl++ = txdr_unsigned(nd->nd_retxid); 1497 *tl++ = rpc_reply; 1498 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1499 *tl++ = rpc_msgdenied; 1500 if (err & NFSERR_AUTHERR) { 1501 *tl++ = rpc_autherr; 1502 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1503 mreq->m_len -= NFSX_UNSIGNED; 1504 bpos -= NFSX_UNSIGNED; 1505 } else { 1506 *tl++ = rpc_mismatch; 1507 *tl++ = txdr_unsigned(RPC_VER2); 1508 *tl = txdr_unsigned(RPC_VER2); 1509 } 1510 } else { 1511 *tl++ = rpc_msgaccepted; 1512 1513 /* 1514 * For Kerberos authentication, we must send the nickname 1515 * verifier back, otherwise just RPCAUTH_NULL. 1516 */ 1517 if (nd->nd_flag & ND_KERBFULL) { 1518 struct nfsuid *nuidp; 1519 struct timeval ktvin, ktvout; 1520 1521 memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ 1522 1523 LIST_FOREACH(nuidp, 1524 NUIDHASH(slp, kauth_cred_geteuid(nd->nd_cr)), 1525 nu_hash) { 1526 if (kauth_cred_geteuid(nuidp->nu_cr) == 1527 kauth_cred_geteuid(nd->nd_cr) && 1528 (!nd->nd_nam2 || netaddr_match( 1529 NU_NETFAM(nuidp), &nuidp->nu_haddr, 1530 nd->nd_nam2))) 1531 break; 1532 } 1533 if (nuidp) { 1534 ktvin.tv_sec = 1535 txdr_unsigned(nuidp->nu_timestamp.tv_sec 1536 - 1); 1537 ktvin.tv_usec = 1538 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1539 1540 /* 1541 * Encrypt the timestamp in ecb mode using the 1542 * session key. 1543 */ 1544 #ifdef NFSKERB 1545 XXX 1546 #endif 1547 1548 *tl++ = rpc_auth_kerb; 1549 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1550 *tl = ktvout.tv_sec; 1551 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1552 *tl++ = ktvout.tv_usec; 1553 *tl++ = txdr_unsigned( 1554 kauth_cred_geteuid(nuidp->nu_cr)); 1555 } else { 1556 *tl++ = 0; 1557 *tl++ = 0; 1558 } 1559 } else { 1560 *tl++ = 0; 1561 *tl++ = 0; 1562 } 1563 switch (err) { 1564 case EPROGUNAVAIL: 1565 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1566 break; 1567 case EPROGMISMATCH: 1568 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1569 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1570 if (nd->nd_flag & ND_NQNFS) { 1571 *tl++ = txdr_unsigned(3); 1572 *tl = txdr_unsigned(3); 1573 } else { 1574 *tl++ = txdr_unsigned(2); 1575 *tl = txdr_unsigned(3); 1576 } 1577 break; 1578 case EPROCUNAVAIL: 1579 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1580 break; 1581 case EBADRPC: 1582 *tl = txdr_unsigned(RPC_GARBAGE); 1583 break; 1584 default: 1585 *tl = 0; 1586 if (err != NFSERR_RETVOID) { 1587 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1588 if (err) 1589 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1590 else 1591 *tl = 0; 1592 } 1593 break; 1594 }; 1595 } 1596 1597 /* 1598 * For nqnfs, piggyback lease as requested. 1599 */ 1600 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1601 if (nd->nd_flag & ND_LEASE) { 1602 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1603 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1604 *tl++ = txdr_unsigned(cache); 1605 *tl++ = txdr_unsigned(nd->nd_duration); 1606 txdr_hyper(*frev, tl); 1607 } else { 1608 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1609 *tl = 0; 1610 } 1611 } 1612 if (mrq != NULL) 1613 *mrq = mreq; 1614 *mbp = mb; 1615 *bposp = bpos; 1616 if (err != 0 && err != NFSERR_RETVOID) 1617 nfsstats.srvrpc_errs++; 1618 return (0); 1619 } 1620 1621 /* 1622 * Nfs timer routine 1623 * Scan the nfsreq list and retranmit any requests that have timed out 1624 * To avoid retransmission attempts on STREAM sockets (in the future) make 1625 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1626 */ 1627 void 1628 nfs_timer(arg) 1629 void *arg; /* never used */ 1630 { 1631 struct nfsreq *rep; 1632 struct mbuf *m; 1633 struct socket *so; 1634 struct nfsmount *nmp; 1635 int timeo; 1636 int s, error; 1637 #ifdef NFSSERVER 1638 struct timeval tv; 1639 struct nfssvc_sock *slp; 1640 static long lasttime = 0; 1641 u_quad_t cur_usec; 1642 #endif 1643 1644 s = splsoftnet(); 1645 TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { 1646 nmp = rep->r_nmp; 1647 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1648 continue; 1649 if (nfs_sigintr(nmp, rep, rep->r_lwp)) { 1650 rep->r_flags |= R_SOFTTERM; 1651 continue; 1652 } 1653 if (rep->r_rtt >= 0) { 1654 rep->r_rtt++; 1655 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1656 timeo = nmp->nm_timeo; 1657 else 1658 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1659 if (nmp->nm_timeouts > 0) 1660 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1661 if (rep->r_rtt <= timeo) 1662 continue; 1663 if (nmp->nm_timeouts < 1664 (sizeof(nfs_backoff) / sizeof(nfs_backoff[0]))) 1665 nmp->nm_timeouts++; 1666 } 1667 /* 1668 * Check for server not responding 1669 */ 1670 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1671 rep->r_rexmit > nmp->nm_deadthresh) { 1672 nfs_msg(rep->r_lwp, 1673 nmp->nm_mountp->mnt_stat.f_mntfromname, 1674 "not responding"); 1675 rep->r_flags |= R_TPRINTFMSG; 1676 } 1677 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1678 nfsstats.rpctimeouts++; 1679 rep->r_flags |= R_SOFTTERM; 1680 continue; 1681 } 1682 if (nmp->nm_sotype != SOCK_DGRAM) { 1683 if (++rep->r_rexmit > NFS_MAXREXMIT) 1684 rep->r_rexmit = NFS_MAXREXMIT; 1685 continue; 1686 } 1687 if ((so = nmp->nm_so) == NULL) 1688 continue; 1689 1690 /* 1691 * If there is enough space and the window allows.. 1692 * Resend it 1693 * Set r_rtt to -1 in case we fail to send it now. 1694 */ 1695 rep->r_rtt = -1; 1696 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1697 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1698 (rep->r_flags & R_SENT) || 1699 nmp->nm_sent < nmp->nm_cwnd) && 1700 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1701 if (so->so_state & SS_ISCONNECTED) 1702 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1703 (struct mbuf *)0, (struct mbuf *)0, (struct lwp *)0); 1704 else 1705 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, m, 1706 nmp->nm_nam, (struct mbuf *)0, (struct lwp *)0); 1707 if (error) { 1708 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 1709 #ifdef DEBUG 1710 printf("nfs_timer: ignoring error %d\n", 1711 error); 1712 #endif 1713 so->so_error = 0; 1714 } 1715 } else { 1716 /* 1717 * Iff first send, start timing 1718 * else turn timing off, backoff timer 1719 * and divide congestion window by 2. 1720 */ 1721 if (rep->r_flags & R_SENT) { 1722 rep->r_flags &= ~R_TIMING; 1723 if (++rep->r_rexmit > NFS_MAXREXMIT) 1724 rep->r_rexmit = NFS_MAXREXMIT; 1725 nmp->nm_cwnd >>= 1; 1726 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1727 nmp->nm_cwnd = NFS_CWNDSCALE; 1728 nfsstats.rpcretries++; 1729 } else { 1730 rep->r_flags |= R_SENT; 1731 nmp->nm_sent += NFS_CWNDSCALE; 1732 } 1733 rep->r_rtt = 0; 1734 } 1735 } 1736 } 1737 1738 #ifdef NFSSERVER 1739 /* 1740 * Call the nqnfs server timer once a second to handle leases. 1741 */ 1742 if (lasttime != time_second) { 1743 lasttime = time_second; 1744 nqnfs_serverd(); 1745 } 1746 1747 /* 1748 * Scan the write gathering queues for writes that need to be 1749 * completed now. 1750 */ 1751 getmicrotime(&tv); 1752 cur_usec = (u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec; 1753 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 1754 if (LIST_FIRST(&slp->ns_tq) && 1755 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) 1756 nfsrv_wakenfsd(slp); 1757 } 1758 #endif /* NFSSERVER */ 1759 splx(s); 1760 callout_schedule(&nfs_timer_ch, nfs_ticks); 1761 } 1762 1763 /*ARGSUSED*/ 1764 void 1765 nfs_exit(p, v) 1766 struct proc *p; 1767 void *v; 1768 { 1769 struct nfsreq *rp; 1770 int s = splsoftnet(); 1771 1772 TAILQ_FOREACH(rp, &nfs_reqq, r_chain) { 1773 if (rp->r_lwp && rp->r_lwp->l_proc == p) 1774 TAILQ_REMOVE(&nfs_reqq, rp, r_chain); 1775 } 1776 splx(s); 1777 } 1778 1779 /* 1780 * Test for a termination condition pending on the process. 1781 * This is used for NFSMNT_INT mounts. 1782 */ 1783 int 1784 nfs_sigintr(nmp, rep, l) 1785 struct nfsmount *nmp; 1786 struct nfsreq *rep; 1787 struct lwp *l; 1788 { 1789 sigset_t ss; 1790 1791 if (rep && (rep->r_flags & R_SOFTTERM)) 1792 return (EINTR); 1793 if (!(nmp->nm_flag & NFSMNT_INT)) 1794 return (0); 1795 if (l) { 1796 sigpending1(l->l_proc, &ss); 1797 #if 0 1798 sigminusset(&l->l_proc->p_sigctx.ps_sigignore, &ss); 1799 #endif 1800 if (sigismember(&ss, SIGINT) || sigismember(&ss, SIGTERM) || 1801 sigismember(&ss, SIGKILL) || sigismember(&ss, SIGHUP) || 1802 sigismember(&ss, SIGQUIT)) 1803 return (EINTR); 1804 } 1805 return (0); 1806 } 1807 1808 /* 1809 * Lock a socket against others. 1810 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1811 * and also to avoid race conditions between the processes with nfs requests 1812 * in progress when a reconnect is necessary. 1813 */ 1814 int 1815 nfs_sndlock(flagp, rep) 1816 int *flagp; 1817 struct nfsreq *rep; 1818 { 1819 struct lwp *l; 1820 int slpflag = 0, slptimeo = 0; 1821 1822 if (rep) { 1823 l = rep->r_lwp; 1824 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1825 slpflag = PCATCH; 1826 } else 1827 l = (struct lwp *)0; 1828 while (*flagp & NFSMNT_SNDLOCK) { 1829 if (rep && nfs_sigintr(rep->r_nmp, rep, l)) 1830 return (EINTR); 1831 *flagp |= NFSMNT_WANTSND; 1832 (void) tsleep((caddr_t)flagp, slpflag | (PZERO - 1), "nfsndlck", 1833 slptimeo); 1834 if (slpflag == PCATCH) { 1835 slpflag = 0; 1836 slptimeo = 2 * hz; 1837 } 1838 } 1839 *flagp |= NFSMNT_SNDLOCK; 1840 return (0); 1841 } 1842 1843 /* 1844 * Unlock the stream socket for others. 1845 */ 1846 void 1847 nfs_sndunlock(flagp) 1848 int *flagp; 1849 { 1850 1851 if ((*flagp & NFSMNT_SNDLOCK) == 0) 1852 panic("nfs sndunlock"); 1853 *flagp &= ~NFSMNT_SNDLOCK; 1854 if (*flagp & NFSMNT_WANTSND) { 1855 *flagp &= ~NFSMNT_WANTSND; 1856 wakeup((caddr_t)flagp); 1857 } 1858 } 1859 1860 int 1861 nfs_rcvlock(rep) 1862 struct nfsreq *rep; 1863 { 1864 struct nfsmount *nmp = rep->r_nmp; 1865 int *flagp = &nmp->nm_iflag; 1866 int slpflag, slptimeo = 0; 1867 int error = 0; 1868 1869 if (*flagp & NFSMNT_DISMNT) 1870 return EIO; 1871 1872 if (*flagp & NFSMNT_INT) 1873 slpflag = PCATCH; 1874 else 1875 slpflag = 0; 1876 simple_lock(&nmp->nm_slock); 1877 while (*flagp & NFSMNT_RCVLOCK) { 1878 if (nfs_sigintr(rep->r_nmp, rep, rep->r_lwp)) { 1879 error = EINTR; 1880 goto quit; 1881 } 1882 *flagp |= NFSMNT_WANTRCV; 1883 nmp->nm_waiters++; 1884 (void) ltsleep(flagp, slpflag | (PZERO - 1), "nfsrcvlk", 1885 slptimeo, &nmp->nm_slock); 1886 nmp->nm_waiters--; 1887 if (*flagp & NFSMNT_DISMNT) { 1888 wakeup(&nmp->nm_waiters); 1889 error = EIO; 1890 goto quit; 1891 } 1892 /* If our reply was received while we were sleeping, 1893 * then just return without taking the lock to avoid a 1894 * situation where a single iod could 'capture' the 1895 * receive lock. 1896 */ 1897 if (rep->r_mrep != NULL) { 1898 error = EALREADY; 1899 goto quit; 1900 } 1901 if (slpflag == PCATCH) { 1902 slpflag = 0; 1903 slptimeo = 2 * hz; 1904 } 1905 } 1906 *flagp |= NFSMNT_RCVLOCK; 1907 quit: 1908 simple_unlock(&nmp->nm_slock); 1909 return error; 1910 } 1911 1912 /* 1913 * Unlock the stream socket for others. 1914 */ 1915 void 1916 nfs_rcvunlock(nmp) 1917 struct nfsmount *nmp; 1918 { 1919 int *flagp = &nmp->nm_iflag; 1920 1921 simple_lock(&nmp->nm_slock); 1922 if ((*flagp & NFSMNT_RCVLOCK) == 0) 1923 panic("nfs rcvunlock"); 1924 *flagp &= ~NFSMNT_RCVLOCK; 1925 if (*flagp & NFSMNT_WANTRCV) { 1926 *flagp &= ~NFSMNT_WANTRCV; 1927 wakeup((caddr_t)flagp); 1928 } 1929 simple_unlock(&nmp->nm_slock); 1930 } 1931 1932 /* 1933 * Parse an RPC request 1934 * - verify it 1935 * - allocate and fill in the cred. 1936 */ 1937 int 1938 nfs_getreq(nd, nfsd, has_header) 1939 struct nfsrv_descript *nd; 1940 struct nfsd *nfsd; 1941 int has_header; 1942 { 1943 int len, i; 1944 u_int32_t *tl; 1945 int32_t t1; 1946 struct uio uio; 1947 struct iovec iov; 1948 caddr_t dpos, cp2, cp; 1949 u_int32_t nfsvers, auth_type; 1950 uid_t nickuid; 1951 int error = 0, nqnfs = 0, ticklen; 1952 struct mbuf *mrep, *md; 1953 struct nfsuid *nuidp; 1954 struct timeval tvin, tvout; 1955 1956 memset(&tvout, 0, sizeof tvout); /* XXX gcc */ 1957 1958 KASSERT(nd->nd_cr == NULL); 1959 mrep = nd->nd_mrep; 1960 md = nd->nd_md; 1961 dpos = nd->nd_dpos; 1962 if (has_header) { 1963 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1964 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1965 if (*tl++ != rpc_call) { 1966 m_freem(mrep); 1967 return (EBADRPC); 1968 } 1969 } else 1970 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1971 nd->nd_repstat = 0; 1972 nd->nd_flag = 0; 1973 if (*tl++ != rpc_vers) { 1974 nd->nd_repstat = ERPCMISMATCH; 1975 nd->nd_procnum = NFSPROC_NOOP; 1976 return (0); 1977 } 1978 if (*tl != nfs_prog) { 1979 if (*tl == nqnfs_prog) 1980 nqnfs++; 1981 else { 1982 nd->nd_repstat = EPROGUNAVAIL; 1983 nd->nd_procnum = NFSPROC_NOOP; 1984 return (0); 1985 } 1986 } 1987 tl++; 1988 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1989 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1990 (nfsvers != NQNFS_VER3 && nqnfs)) { 1991 nd->nd_repstat = EPROGMISMATCH; 1992 nd->nd_procnum = NFSPROC_NOOP; 1993 return (0); 1994 } 1995 if (nqnfs) 1996 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1997 else if (nfsvers == NFS_VER3) 1998 nd->nd_flag = ND_NFSV3; 1999 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 2000 if (nd->nd_procnum == NFSPROC_NULL) 2001 return (0); 2002 if (nd->nd_procnum >= NFS_NPROCS || 2003 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 2004 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 2005 nd->nd_repstat = EPROCUNAVAIL; 2006 nd->nd_procnum = NFSPROC_NOOP; 2007 return (0); 2008 } 2009 if ((nd->nd_flag & ND_NFSV3) == 0) 2010 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 2011 auth_type = *tl++; 2012 len = fxdr_unsigned(int, *tl++); 2013 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2014 m_freem(mrep); 2015 return (EBADRPC); 2016 } 2017 2018 nd->nd_flag &= ~ND_KERBAUTH; 2019 /* 2020 * Handle auth_unix or auth_kerb. 2021 */ 2022 if (auth_type == rpc_auth_unix) { 2023 uid_t uid; 2024 gid_t gid, *grbuf; 2025 2026 nd->nd_cr = kauth_cred_alloc(); 2027 len = fxdr_unsigned(int, *++tl); 2028 if (len < 0 || len > NFS_MAXNAMLEN) { 2029 m_freem(mrep); 2030 error = EBADRPC; 2031 goto errout; 2032 } 2033 nfsm_adv(nfsm_rndup(len)); 2034 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2035 2036 uid = fxdr_unsigned(uid_t, *tl++); 2037 gid = fxdr_unsigned(gid_t, *tl++); 2038 kauth_cred_setuid(nd->nd_cr, uid); 2039 kauth_cred_setgid(nd->nd_cr, gid); 2040 kauth_cred_seteuid(nd->nd_cr, uid); 2041 kauth_cred_setsvuid(nd->nd_cr, gid); 2042 kauth_cred_setegid(nd->nd_cr, uid); 2043 kauth_cred_setsvgid(nd->nd_cr, gid); 2044 2045 len = fxdr_unsigned(int, *tl); 2046 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 2047 m_freem(mrep); 2048 error = EBADRPC; 2049 goto errout; 2050 } 2051 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 2052 2053 grbuf = malloc(len * sizeof(gid_t), M_TEMP, M_WAITOK); 2054 for (i = 0; i < len; i++) { 2055 if (i < NGROUPS) /* XXX elad */ 2056 grbuf[i] = fxdr_unsigned(gid_t, *tl++); 2057 else 2058 tl++; 2059 } 2060 kauth_cred_setgroups(nd->nd_cr, grbuf, min(len, NGROUPS), -1); 2061 free(grbuf, M_TEMP); 2062 2063 len = fxdr_unsigned(int, *++tl); 2064 if (len < 0 || len > RPCAUTH_MAXSIZ) { 2065 m_freem(mrep); 2066 error = EBADRPC; 2067 goto errout; 2068 } 2069 if (len > 0) 2070 nfsm_adv(nfsm_rndup(len)); 2071 } else if (auth_type == rpc_auth_kerb) { 2072 switch (fxdr_unsigned(int, *tl++)) { 2073 case RPCAKN_FULLNAME: 2074 ticklen = fxdr_unsigned(int, *tl); 2075 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 2076 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 2077 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 2078 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 2079 m_freem(mrep); 2080 error = EBADRPC; 2081 goto errout; 2082 } 2083 uio.uio_offset = 0; 2084 uio.uio_iov = &iov; 2085 uio.uio_iovcnt = 1; 2086 UIO_SETUP_SYSSPACE(&uio); 2087 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 2088 iov.iov_len = RPCAUTH_MAXSIZ - 4; 2089 nfsm_mtouio(&uio, uio.uio_resid); 2090 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2091 if (*tl++ != rpc_auth_kerb || 2092 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 2093 printf("Bad kerb verifier\n"); 2094 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2095 nd->nd_procnum = NFSPROC_NOOP; 2096 return (0); 2097 } 2098 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 2099 tl = (u_int32_t *)cp; 2100 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 2101 printf("Not fullname kerb verifier\n"); 2102 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2103 nd->nd_procnum = NFSPROC_NOOP; 2104 return (0); 2105 } 2106 cp += NFSX_UNSIGNED; 2107 memcpy(nfsd->nfsd_verfstr, cp, 3 * NFSX_UNSIGNED); 2108 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 2109 nd->nd_flag |= ND_KERBFULL; 2110 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 2111 break; 2112 case RPCAKN_NICKNAME: 2113 if (len != 2 * NFSX_UNSIGNED) { 2114 printf("Kerb nickname short\n"); 2115 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 2116 nd->nd_procnum = NFSPROC_NOOP; 2117 return (0); 2118 } 2119 nickuid = fxdr_unsigned(uid_t, *tl); 2120 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 2121 if (*tl++ != rpc_auth_kerb || 2122 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 2123 printf("Kerb nick verifier bad\n"); 2124 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 2125 nd->nd_procnum = NFSPROC_NOOP; 2126 return (0); 2127 } 2128 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 2129 tvin.tv_sec = *tl++; 2130 tvin.tv_usec = *tl; 2131 2132 LIST_FOREACH(nuidp, NUIDHASH(nfsd->nfsd_slp, nickuid), 2133 nu_hash) { 2134 if (kauth_cred_geteuid(nuidp->nu_cr) == nickuid && 2135 (!nd->nd_nam2 || 2136 netaddr_match(NU_NETFAM(nuidp), 2137 &nuidp->nu_haddr, nd->nd_nam2))) 2138 break; 2139 } 2140 if (!nuidp) { 2141 nd->nd_repstat = 2142 (NFSERR_AUTHERR|AUTH_REJECTCRED); 2143 nd->nd_procnum = NFSPROC_NOOP; 2144 return (0); 2145 } 2146 2147 /* 2148 * Now, decrypt the timestamp using the session key 2149 * and validate it. 2150 */ 2151 #ifdef NFSKERB 2152 XXX 2153 #endif 2154 2155 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 2156 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 2157 if (nuidp->nu_expire < time_second || 2158 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 2159 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 2160 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 2161 nuidp->nu_expire = 0; 2162 nd->nd_repstat = 2163 (NFSERR_AUTHERR|AUTH_REJECTVERF); 2164 nd->nd_procnum = NFSPROC_NOOP; 2165 return (0); 2166 } 2167 kauth_cred_hold(nuidp->nu_cr); 2168 nd->nd_cr = nuidp->nu_cr; 2169 nd->nd_flag |= ND_KERBNICK; 2170 } 2171 } else { 2172 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 2173 nd->nd_procnum = NFSPROC_NOOP; 2174 return (0); 2175 } 2176 2177 /* 2178 * For nqnfs, get piggybacked lease request. 2179 */ 2180 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 2181 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2182 nd->nd_flag |= fxdr_unsigned(int, *tl); 2183 if (nd->nd_flag & ND_LEASE) { 2184 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2185 nd->nd_duration = fxdr_unsigned(u_int32_t, *tl); 2186 } else 2187 nd->nd_duration = NQ_MINLEASE; 2188 } else 2189 nd->nd_duration = NQ_MINLEASE; 2190 nd->nd_md = md; 2191 nd->nd_dpos = dpos; 2192 KASSERT((nd->nd_cr == NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) != 0) 2193 || (nd->nd_cr != NULL && (nfsd->nfsd_flag & NFSD_NEEDAUTH) == 0)); 2194 return (0); 2195 nfsmout: 2196 errout: 2197 KASSERT(error != 0); 2198 if (nd->nd_cr != NULL) { 2199 kauth_cred_free(nd->nd_cr); 2200 nd->nd_cr = NULL; 2201 } 2202 return (error); 2203 } 2204 2205 int 2206 nfs_msg(l, server, msg) 2207 struct lwp *l; 2208 const char *server, *msg; 2209 { 2210 tpr_t tpr; 2211 2212 if (l) 2213 tpr = tprintf_open(l->l_proc); 2214 else 2215 tpr = NULL; 2216 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2217 tprintf_close(tpr); 2218 return (0); 2219 } 2220 2221 #ifdef NFSSERVER 2222 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *, 2223 struct nfssvc_sock *, struct lwp *, 2224 struct mbuf **)) = { 2225 nfsrv_null, 2226 nfsrv_getattr, 2227 nfsrv_setattr, 2228 nfsrv_lookup, 2229 nfsrv3_access, 2230 nfsrv_readlink, 2231 nfsrv_read, 2232 nfsrv_write, 2233 nfsrv_create, 2234 nfsrv_mkdir, 2235 nfsrv_symlink, 2236 nfsrv_mknod, 2237 nfsrv_remove, 2238 nfsrv_rmdir, 2239 nfsrv_rename, 2240 nfsrv_link, 2241 nfsrv_readdir, 2242 nfsrv_readdirplus, 2243 nfsrv_statfs, 2244 nfsrv_fsinfo, 2245 nfsrv_pathconf, 2246 nfsrv_commit, 2247 nqnfsrv_getlease, 2248 nqnfsrv_vacated, 2249 nfsrv_noop, 2250 nfsrv_noop 2251 }; 2252 2253 /* 2254 * Socket upcall routine for the nfsd sockets. 2255 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2256 * Essentially do as much as possible non-blocking, else punt and it will 2257 * be called with M_WAIT from an nfsd. 2258 */ 2259 void 2260 nfsrv_rcv(so, arg, waitflag) 2261 struct socket *so; 2262 caddr_t arg; 2263 int waitflag; 2264 { 2265 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2266 struct mbuf *m; 2267 struct mbuf *mp, *nam; 2268 struct uio auio; 2269 int flags, error; 2270 int setflags = 0; 2271 2272 error = nfsdsock_lock(slp, (waitflag != M_DONTWAIT)); 2273 if (error) { 2274 setflags |= SLP_NEEDQ; 2275 goto dorecs_unlocked; 2276 } 2277 2278 KASSERT(so == slp->ns_so); 2279 #define NFS_TEST_HEAVY 2280 #ifdef NFS_TEST_HEAVY 2281 /* 2282 * Define this to test for nfsds handling this under heavy load. 2283 * 2284 * XXX it isn't safe to call so_receive from so_upcall context. 2285 */ 2286 if (waitflag == M_DONTWAIT) { 2287 setflags |= SLP_NEEDQ; 2288 goto dorecs; 2289 } 2290 #endif 2291 simple_lock(&slp->ns_lock); 2292 slp->ns_flag &= ~SLP_NEEDQ; 2293 simple_unlock(&slp->ns_lock); 2294 if (so->so_type == SOCK_STREAM) { 2295 #ifndef NFS_TEST_HEAVY 2296 /* 2297 * If there are already records on the queue, defer soreceive() 2298 * to an nfsd so that there is feedback to the TCP layer that 2299 * the nfs servers are heavily loaded. 2300 */ 2301 if (slp->ns_rec && waitflag == M_DONTWAIT) { 2302 setflags |= SLP_NEEDQ; 2303 goto dorecs; 2304 } 2305 #endif 2306 2307 /* 2308 * Do soreceive(). 2309 */ 2310 auio.uio_resid = 1000000000; 2311 /* not need to setup uio_vmspace */ 2312 flags = MSG_DONTWAIT; 2313 error = (*so->so_receive)(so, &nam, &auio, &mp, NULL, &flags); 2314 if (error || mp == NULL) { 2315 if (error == EWOULDBLOCK) 2316 setflags |= SLP_NEEDQ; 2317 else 2318 setflags |= SLP_DISCONN; 2319 goto dorecs; 2320 } 2321 m = mp; 2322 if (slp->ns_rawend) { 2323 slp->ns_rawend->m_next = m; 2324 slp->ns_cc += 1000000000 - auio.uio_resid; 2325 } else { 2326 slp->ns_raw = m; 2327 slp->ns_cc = 1000000000 - auio.uio_resid; 2328 } 2329 while (m->m_next) 2330 m = m->m_next; 2331 slp->ns_rawend = m; 2332 2333 /* 2334 * Now try and parse record(s) out of the raw stream data. 2335 */ 2336 error = nfsrv_getstream(slp, waitflag); 2337 if (error) { 2338 if (error == EPERM) 2339 setflags |= SLP_DISCONN; 2340 else 2341 setflags |= SLP_NEEDQ; 2342 } 2343 } else { 2344 do { 2345 auio.uio_resid = 1000000000; 2346 /* not need to setup uio_vmspace */ 2347 flags = MSG_DONTWAIT; 2348 error = (*so->so_receive)(so, &nam, &auio, &mp, NULL, 2349 &flags); 2350 if (mp) { 2351 if (nam) { 2352 m = nam; 2353 m->m_next = mp; 2354 } else 2355 m = mp; 2356 if (slp->ns_recend) 2357 slp->ns_recend->m_nextpkt = m; 2358 else 2359 slp->ns_rec = m; 2360 slp->ns_recend = m; 2361 m->m_nextpkt = (struct mbuf *)0; 2362 } 2363 if (error) { 2364 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2365 && error != EWOULDBLOCK) { 2366 setflags |= SLP_DISCONN; 2367 goto dorecs; 2368 } 2369 } 2370 } while (mp); 2371 } 2372 dorecs: 2373 nfsdsock_unlock(slp); 2374 2375 dorecs_unlocked: 2376 /* 2377 * Now try and process the request records, non-blocking. 2378 */ 2379 if (setflags) { 2380 simple_lock(&slp->ns_lock); 2381 slp->ns_flag |= setflags; 2382 simple_unlock(&slp->ns_lock); 2383 } 2384 if (waitflag == M_DONTWAIT && 2385 (slp->ns_rec || (slp->ns_flag & (SLP_DISCONN | SLP_NEEDQ)) != 0)) { 2386 nfsrv_wakenfsd(slp); 2387 } 2388 } 2389 2390 int 2391 nfsdsock_lock(struct nfssvc_sock *slp, boolean_t waitok) 2392 { 2393 2394 simple_lock(&slp->ns_lock); 2395 while ((slp->ns_flag & (SLP_BUSY|SLP_VALID)) == SLP_BUSY) { 2396 if (!waitok) { 2397 simple_unlock(&slp->ns_lock); 2398 return EWOULDBLOCK; 2399 } 2400 slp->ns_flag |= SLP_WANT; 2401 ltsleep(&slp->ns_flag, PSOCK, "nslock", 0, &slp->ns_lock); 2402 } 2403 if ((slp->ns_flag & SLP_VALID) == 0) { 2404 simple_unlock(&slp->ns_lock); 2405 return EINVAL; 2406 } 2407 slp->ns_flag |= SLP_BUSY; 2408 simple_unlock(&slp->ns_lock); 2409 2410 return 0; 2411 } 2412 2413 void 2414 nfsdsock_unlock(struct nfssvc_sock *slp) 2415 { 2416 2417 KASSERT((slp->ns_flag & SLP_BUSY) != 0); 2418 2419 simple_lock(&slp->ns_lock); 2420 if ((slp->ns_flag & SLP_WANT) != 0) { 2421 wakeup(&slp->ns_flag); 2422 } 2423 slp->ns_flag &= ~(SLP_BUSY|SLP_WANT); 2424 simple_unlock(&slp->ns_lock); 2425 } 2426 2427 int 2428 nfsdsock_drain(struct nfssvc_sock *slp) 2429 { 2430 int error = 0; 2431 2432 simple_lock(&slp->ns_lock); 2433 if ((slp->ns_flag & SLP_VALID) == 0) { 2434 error = EINVAL; 2435 goto done; 2436 } 2437 slp->ns_flag &= ~SLP_VALID; 2438 while ((slp->ns_flag & SLP_BUSY) != 0) { 2439 slp->ns_flag |= SLP_WANT; 2440 ltsleep(&slp->ns_flag, PSOCK, "nsdrain", 0, &slp->ns_lock); 2441 } 2442 done: 2443 simple_unlock(&slp->ns_lock); 2444 2445 return error; 2446 } 2447 2448 /* 2449 * Try and extract an RPC request from the mbuf data list received on a 2450 * stream socket. The "waitflag" argument indicates whether or not it 2451 * can sleep. 2452 */ 2453 int 2454 nfsrv_getstream(slp, waitflag) 2455 struct nfssvc_sock *slp; 2456 int waitflag; 2457 { 2458 struct mbuf *m, **mpp; 2459 struct mbuf *recm; 2460 u_int32_t recmark; 2461 int error = 0; 2462 2463 for (;;) { 2464 if (slp->ns_reclen == 0) { 2465 if (slp->ns_cc < NFSX_UNSIGNED) { 2466 break; 2467 } 2468 m = slp->ns_raw; 2469 m_copydata(m, 0, NFSX_UNSIGNED, (caddr_t)&recmark); 2470 m_adj(m, NFSX_UNSIGNED); 2471 slp->ns_cc -= NFSX_UNSIGNED; 2472 recmark = ntohl(recmark); 2473 slp->ns_reclen = recmark & ~0x80000000; 2474 if (recmark & 0x80000000) 2475 slp->ns_flag |= SLP_LASTFRAG; 2476 else 2477 slp->ns_flag &= ~SLP_LASTFRAG; 2478 if (slp->ns_reclen > NFS_MAXPACKET) { 2479 error = EPERM; 2480 break; 2481 } 2482 } 2483 2484 /* 2485 * Now get the record part. 2486 * 2487 * Note that slp->ns_reclen may be 0. Linux sometimes 2488 * generates 0-length records. 2489 */ 2490 if (slp->ns_cc == slp->ns_reclen) { 2491 recm = slp->ns_raw; 2492 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2493 slp->ns_cc = slp->ns_reclen = 0; 2494 } else if (slp->ns_cc > slp->ns_reclen) { 2495 recm = slp->ns_raw; 2496 m = m_split(recm, slp->ns_reclen, waitflag); 2497 if (m == NULL) { 2498 error = EWOULDBLOCK; 2499 break; 2500 } 2501 m_claimm(recm, &nfs_mowner); 2502 slp->ns_raw = m; 2503 if (m->m_next == NULL) 2504 slp->ns_rawend = m; 2505 slp->ns_cc -= slp->ns_reclen; 2506 slp->ns_reclen = 0; 2507 } else { 2508 break; 2509 } 2510 2511 /* 2512 * Accumulate the fragments into a record. 2513 */ 2514 mpp = &slp->ns_frag; 2515 while (*mpp) 2516 mpp = &((*mpp)->m_next); 2517 *mpp = recm; 2518 if (slp->ns_flag & SLP_LASTFRAG) { 2519 if (slp->ns_recend) 2520 slp->ns_recend->m_nextpkt = slp->ns_frag; 2521 else 2522 slp->ns_rec = slp->ns_frag; 2523 slp->ns_recend = slp->ns_frag; 2524 slp->ns_frag = (struct mbuf *)0; 2525 } 2526 } 2527 2528 return error; 2529 } 2530 2531 /* 2532 * Parse an RPC header. 2533 */ 2534 int 2535 nfsrv_dorec(slp, nfsd, ndp) 2536 struct nfssvc_sock *slp; 2537 struct nfsd *nfsd; 2538 struct nfsrv_descript **ndp; 2539 { 2540 struct mbuf *m, *nam; 2541 struct nfsrv_descript *nd; 2542 int error; 2543 2544 *ndp = NULL; 2545 2546 if (nfsdsock_lock(slp, TRUE)) { 2547 return ENOBUFS; 2548 } 2549 m = slp->ns_rec; 2550 if (m == NULL) { 2551 nfsdsock_unlock(slp); 2552 return ENOBUFS; 2553 } 2554 slp->ns_rec = m->m_nextpkt; 2555 if (slp->ns_rec) 2556 m->m_nextpkt = NULL; 2557 else 2558 slp->ns_recend = NULL; 2559 nfsdsock_unlock(slp); 2560 2561 if (m->m_type == MT_SONAME) { 2562 nam = m; 2563 m = m->m_next; 2564 nam->m_next = NULL; 2565 } else 2566 nam = NULL; 2567 nd = nfsdreq_alloc(); 2568 nd->nd_md = nd->nd_mrep = m; 2569 nd->nd_nam2 = nam; 2570 nd->nd_dpos = mtod(m, caddr_t); 2571 error = nfs_getreq(nd, nfsd, TRUE); 2572 if (error) { 2573 m_freem(nam); 2574 nfsdreq_free(nd); 2575 return (error); 2576 } 2577 *ndp = nd; 2578 nfsd->nfsd_nd = nd; 2579 return (0); 2580 } 2581 2582 /* 2583 * Search for a sleeping nfsd and wake it up. 2584 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2585 * running nfsds will go look for the work in the nfssvc_sock list. 2586 */ 2587 void 2588 nfsrv_wakenfsd(slp) 2589 struct nfssvc_sock *slp; 2590 { 2591 struct nfsd *nd; 2592 2593 if ((slp->ns_flag & SLP_VALID) == 0) 2594 return; 2595 simple_lock(&nfsd_slock); 2596 if (slp->ns_flag & SLP_DOREC) { 2597 simple_unlock(&nfsd_slock); 2598 return; 2599 } 2600 nd = SLIST_FIRST(&nfsd_idle_head); 2601 if (nd) { 2602 SLIST_REMOVE_HEAD(&nfsd_idle_head, nfsd_idle); 2603 simple_unlock(&nfsd_slock); 2604 2605 if (nd->nfsd_slp) 2606 panic("nfsd wakeup"); 2607 slp->ns_sref++; 2608 nd->nfsd_slp = slp; 2609 wakeup(nd); 2610 return; 2611 } 2612 slp->ns_flag |= SLP_DOREC; 2613 nfsd_head_flag |= NFSD_CHECKSLP; 2614 TAILQ_INSERT_TAIL(&nfssvc_sockpending, slp, ns_pending); 2615 simple_unlock(&nfsd_slock); 2616 } 2617 2618 int 2619 nfsdsock_sendreply(struct nfssvc_sock *slp, struct nfsrv_descript *nd) 2620 { 2621 int error; 2622 2623 if (nd->nd_mrep != NULL) { 2624 m_freem(nd->nd_mrep); 2625 nd->nd_mrep = NULL; 2626 } 2627 2628 simple_lock(&slp->ns_lock); 2629 if ((slp->ns_flag & SLP_SENDING) != 0) { 2630 SIMPLEQ_INSERT_TAIL(&slp->ns_sendq, nd, nd_sendq); 2631 simple_unlock(&slp->ns_lock); 2632 return 0; 2633 } 2634 KASSERT(SIMPLEQ_EMPTY(&slp->ns_sendq)); 2635 slp->ns_flag |= SLP_SENDING; 2636 simple_unlock(&slp->ns_lock); 2637 2638 again: 2639 error = nfs_send(slp->ns_so, nd->nd_nam2, nd->nd_mreq, NULL, curlwp); 2640 if (nd->nd_nam2) { 2641 m_free(nd->nd_nam2); 2642 } 2643 nfsdreq_free(nd); 2644 2645 simple_lock(&slp->ns_lock); 2646 KASSERT((slp->ns_flag & SLP_SENDING) != 0); 2647 nd = SIMPLEQ_FIRST(&slp->ns_sendq); 2648 if (nd != NULL) { 2649 SIMPLEQ_REMOVE_HEAD(&slp->ns_sendq, nd_sendq); 2650 simple_unlock(&slp->ns_lock); 2651 goto again; 2652 } 2653 slp->ns_flag &= ~SLP_SENDING; 2654 simple_unlock(&slp->ns_lock); 2655 2656 return error; 2657 } 2658 #endif /* NFSSERVER */ 2659 2660 #if defined(NFSSERVER) || (defined(NFS) && !defined(NFS_V2_ONLY)) 2661 static struct pool nfs_srvdesc_pool; 2662 2663 void 2664 nfsdreq_init(void) 2665 { 2666 2667 pool_init(&nfs_srvdesc_pool, sizeof(struct nfsrv_descript), 2668 0, 0, 0, "nfsrvdescpl", &pool_allocator_nointr); 2669 } 2670 2671 struct nfsrv_descript * 2672 nfsdreq_alloc(void) 2673 { 2674 struct nfsrv_descript *nd; 2675 2676 nd = pool_get(&nfs_srvdesc_pool, PR_WAITOK); 2677 nd->nd_cr = NULL; 2678 return nd; 2679 } 2680 2681 void 2682 nfsdreq_free(struct nfsrv_descript *nd) 2683 { 2684 kauth_cred_t cr; 2685 2686 cr = nd->nd_cr; 2687 if (cr != NULL) { 2688 KASSERT(kauth_cred_getrefcnt(cr) == 1); 2689 kauth_cred_free(cr); 2690 } 2691 pool_put(&nfs_srvdesc_pool, nd); 2692 } 2693 #endif /* defined(NFSSERVER) || (defined(NFS) && !defined(NFS_V2_ONLY)) */ 2694