Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/nfs/nfs_socket.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
1 /* 2 * Copyright (c) 1989, 1991, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 37 * $FreeBSD$ 38 */ 39 40 /* 41 * Socket operations for use by nfs 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/proc.h> 47 #include <sys/malloc.h> 48 #include <sys/mount.h> 49 #include <sys/kernel.h> 50 #include <sys/mbuf.h> 51 #include <sys/vnode.h> 52 #include <sys/protosw.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/syslog.h> 56 #include <sys/tprintf.h> 57 #include <sys/sysctl.h> 58 #include <sys/signalvar.h> 59 60 #include <netinet/in.h> 61 #include <netinet/tcp.h> 62 63 #include <nfs/rpcv2.h> 64 #include <nfs/nfsproto.h> 65 #include <nfs/nfs.h> 66 #include <nfs/xdr_subs.h> 67 #include <nfs/nfsm_subs.h> 68 #include <nfs/nfsmount.h> 69 #include <nfs/nfsnode.h> 70 #include <nfs/nfsrtt.h> 71 #include <nfs/nqnfs.h> 72 73 #define TRUE 1 74 #define FALSE 0 75 76 /* 77 * Estimate rto for an nfs rpc sent via. an unreliable datagram. 78 * Use the mean and mean deviation of rtt for the appropriate type of rpc 79 * for the frequent rpcs and a default for the others. 80 * The justification for doing "other" this way is that these rpcs 81 * happen so infrequently that timer est. would probably be stale. 82 * Also, since many of these rpcs are 83 * non-idempotent, a conservative timeout is desired. 84 * getattr, lookup - A+2D 85 * read, write - A+4D 86 * other - nm_timeo 87 */ 88 #define NFS_RTO(n, t) \ 89 ((t) == 0 ? (n)->nm_timeo : \ 90 ((t) < 3 ? \ 91 (((((n)->nm_srtt[t-1] + 3) >> 2) + (n)->nm_sdrtt[t-1] + 1) >> 1) : \ 92 ((((n)->nm_srtt[t-1] + 7) >> 3) + (n)->nm_sdrtt[t-1] + 1))) 93 #define NFS_SRTT(r) (r)->r_nmp->nm_srtt[proct[(r)->r_procnum] - 1] 94 #define NFS_SDRTT(r) (r)->r_nmp->nm_sdrtt[proct[(r)->r_procnum] - 1] 95 /* 96 * External data, mostly RPC constants in XDR form 97 */ 98 extern u_int32_t rpc_reply, rpc_msgdenied, rpc_mismatch, rpc_vers, 99 rpc_auth_unix, rpc_msgaccepted, rpc_call, rpc_autherr, 100 rpc_auth_kerb; 101 extern u_int32_t nfs_prog, nqnfs_prog; 102 extern time_t nqnfsstarttime; 103 extern struct nfsstats nfsstats; 104 extern int nfsv3_procid[NFS_NPROCS]; 105 extern int nfs_ticks; 106 107 /* 108 * Defines which timer to use for the procnum. 109 * 0 - default 110 * 1 - getattr 111 * 2 - lookup 112 * 3 - read 113 * 4 - write 114 */ 115 static int proct[NFS_NPROCS] = { 116 0, 1, 0, 2, 1, 3, 3, 4, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 0, 0, 0, 0, 0, 117 0, 0, 0, 118 }; 119 120 static int nfs_realign_test; 121 static int nfs_realign_count; 122 static int nfs_bufpackets = 4; 123 124 SYSCTL_DECL(_vfs_nfs); 125 126 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_test, CTLFLAG_RW, &nfs_realign_test, 0, ""); 127 SYSCTL_INT(_vfs_nfs, OID_AUTO, realign_count, CTLFLAG_RW, &nfs_realign_count, 0, ""); 128 SYSCTL_INT(_vfs_nfs, OID_AUTO, bufpackets, CTLFLAG_RW, &nfs_bufpackets, 0, ""); 129 130 131 /* 132 * There is a congestion window for outstanding rpcs maintained per mount 133 * point. The cwnd size is adjusted in roughly the way that: 134 * Van Jacobson, Congestion avoidance and Control, In "Proceedings of 135 * SIGCOMM '88". ACM, August 1988. 136 * describes for TCP. The cwnd size is chopped in half on a retransmit timeout 137 * and incremented by 1/cwnd when each rpc reply is received and a full cwnd 138 * of rpcs is in progress. 139 * (The sent count and cwnd are scaled for integer arith.) 140 * Variants of "slow start" were tried and were found to be too much of a 141 * performance hit (ave. rtt 3 times larger), 142 * I suspect due to the large rtt that nfs rpcs have. 143 */ 144 #define NFS_CWNDSCALE 256 145 #define NFS_MAXCWND (NFS_CWNDSCALE * 32) 146 static int nfs_backoff[8] = { 2, 4, 8, 16, 32, 64, 128, 256, }; 147 int nfsrtton = 0; 148 struct nfsrtt nfsrtt; 149 struct callout_handle nfs_timer_handle; 150 151 static int nfs_msg __P((struct proc *,char *,char *)); 152 static int nfs_rcvlock __P((struct nfsreq *)); 153 static void nfs_rcvunlock __P((struct nfsreq *)); 154 static void nfs_realign __P((struct mbuf **pm, int hsiz)); 155 static int nfs_receive __P((struct nfsreq *rep, struct sockaddr **aname, 156 struct mbuf **mp)); 157 static void nfs_softterm __P((struct nfsreq *rep)); 158 static int nfs_reconnect __P((struct nfsreq *rep)); 159 #ifndef NFS_NOSERVER 160 static int nfsrv_getstream __P((struct nfssvc_sock *,int)); 161 162 int (*nfsrv3_procs[NFS_NPROCS]) __P((struct nfsrv_descript *nd, 163 struct nfssvc_sock *slp, 164 struct proc *procp, 165 struct mbuf **mreqp)) = { 166 nfsrv_null, 167 nfsrv_getattr, 168 nfsrv_setattr, 169 nfsrv_lookup, 170 nfsrv3_access, 171 nfsrv_readlink, 172 nfsrv_read, 173 nfsrv_write, 174 nfsrv_create, 175 nfsrv_mkdir, 176 nfsrv_symlink, 177 nfsrv_mknod, 178 nfsrv_remove, 179 nfsrv_rmdir, 180 nfsrv_rename, 181 nfsrv_link, 182 nfsrv_readdir, 183 nfsrv_readdirplus, 184 nfsrv_statfs, 185 nfsrv_fsinfo, 186 nfsrv_pathconf, 187 nfsrv_commit, 188 nqnfsrv_getlease, 189 nqnfsrv_vacated, 190 nfsrv_noop, 191 nfsrv_noop 192 }; 193 #endif /* NFS_NOSERVER */ 194 195 /* 196 * Initialize sockets and congestion for a new NFS connection. 197 * We do not free the sockaddr if error. 198 */ 199 int 200 nfs_connect(nmp, rep) 201 register struct nfsmount *nmp; 202 struct nfsreq *rep; 203 { 204 register struct socket *so; 205 int s, error, rcvreserve, sndreserve; 206 int pktscale; 207 struct sockaddr *saddr; 208 struct sockaddr_in *sin; 209 struct proc *p = &proc0; /* only used for socreate and sobind */ 210 211 nmp->nm_so = (struct socket *)0; 212 saddr = nmp->nm_nam; 213 error = socreate(saddr->sa_family, &nmp->nm_so, nmp->nm_sotype, 214 nmp->nm_soproto, p); 215 if (error) 216 goto bad; 217 so = nmp->nm_so; 218 nmp->nm_soflags = so->so_proto->pr_flags; 219 220 /* 221 * Some servers require that the client port be a reserved port number. 222 */ 223 if (saddr->sa_family == AF_INET && (nmp->nm_flag & NFSMNT_RESVPORT)) { 224 struct sockopt sopt; 225 int ip; 226 struct sockaddr_in ssin; 227 228 bzero(&sopt, sizeof sopt); 229 ip = IP_PORTRANGE_LOW; 230 sopt.sopt_dir = SOPT_SET; 231 sopt.sopt_level = IPPROTO_IP; 232 sopt.sopt_name = IP_PORTRANGE; 233 sopt.sopt_val = (void *)&ip; 234 sopt.sopt_valsize = sizeof(ip); 235 sopt.sopt_p = NULL; 236 error = sosetopt(so, &sopt); 237 if (error) 238 goto bad; 239 bzero(&ssin, sizeof ssin); 240 sin = &ssin; 241 sin->sin_len = sizeof (struct sockaddr_in); 242 sin->sin_family = AF_INET; 243 sin->sin_addr.s_addr = INADDR_ANY; 244 sin->sin_port = htons(0); 245 error = sobind(so, (struct sockaddr *)sin, p); 246 if (error) 247 goto bad; 248 bzero(&sopt, sizeof sopt); 249 ip = IP_PORTRANGE_DEFAULT; 250 sopt.sopt_dir = SOPT_SET; 251 sopt.sopt_level = IPPROTO_IP; 252 sopt.sopt_name = IP_PORTRANGE; 253 sopt.sopt_val = (void *)&ip; 254 sopt.sopt_valsize = sizeof(ip); 255 sopt.sopt_p = NULL; 256 error = sosetopt(so, &sopt); 257 if (error) 258 goto bad; 259 } 260 261 /* 262 * Protocols that do not require connections may be optionally left 263 * unconnected for servers that reply from a port other than NFS_PORT. 264 */ 265 if (nmp->nm_flag & NFSMNT_NOCONN) { 266 if (nmp->nm_soflags & PR_CONNREQUIRED) { 267 error = ENOTCONN; 268 goto bad; 269 } 270 } else { 271 error = soconnect(so, nmp->nm_nam, p); 272 if (error) 273 goto bad; 274 275 /* 276 * Wait for the connection to complete. Cribbed from the 277 * connect system call but with the wait timing out so 278 * that interruptible mounts don't hang here for a long time. 279 */ 280 s = splnet(); 281 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 282 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, 283 "nfscon", 2 * hz); 284 if ((so->so_state & SS_ISCONNECTING) && 285 so->so_error == 0 && rep && 286 (error = nfs_sigintr(nmp, rep, rep->r_procp)) != 0){ 287 so->so_state &= ~SS_ISCONNECTING; 288 splx(s); 289 goto bad; 290 } 291 } 292 if (so->so_error) { 293 error = so->so_error; 294 so->so_error = 0; 295 splx(s); 296 goto bad; 297 } 298 splx(s); 299 } 300 so->so_rcv.sb_timeo = (5 * hz); 301 so->so_snd.sb_timeo = (5 * hz); 302 303 /* 304 * Get buffer reservation size from sysctl, but impose reasonable 305 * limits. 306 */ 307 pktscale = nfs_bufpackets; 308 if (pktscale < 2) 309 pktscale = 2; 310 if (pktscale > 64) 311 pktscale = 64; 312 313 if (nmp->nm_sotype == SOCK_DGRAM) { 314 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; 315 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 316 NFS_MAXPKTHDR) * pktscale; 317 } else if (nmp->nm_sotype == SOCK_SEQPACKET) { 318 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR) * pktscale; 319 rcvreserve = (max(nmp->nm_rsize, nmp->nm_readdirsize) + 320 NFS_MAXPKTHDR) * pktscale; 321 } else { 322 if (nmp->nm_sotype != SOCK_STREAM) 323 panic("nfscon sotype"); 324 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 325 struct sockopt sopt; 326 int val; 327 328 bzero(&sopt, sizeof sopt); 329 sopt.sopt_level = SOL_SOCKET; 330 sopt.sopt_name = SO_KEEPALIVE; 331 sopt.sopt_val = &val; 332 sopt.sopt_valsize = sizeof val; 333 val = 1; 334 sosetopt(so, &sopt); 335 } 336 if (so->so_proto->pr_protocol == IPPROTO_TCP) { 337 struct sockopt sopt; 338 int val; 339 340 bzero(&sopt, sizeof sopt); 341 sopt.sopt_level = IPPROTO_TCP; 342 sopt.sopt_name = TCP_NODELAY; 343 sopt.sopt_val = &val; 344 sopt.sopt_valsize = sizeof val; 345 val = 1; 346 sosetopt(so, &sopt); 347 } 348 sndreserve = (nmp->nm_wsize + NFS_MAXPKTHDR + 349 sizeof (u_int32_t)) * pktscale; 350 rcvreserve = (nmp->nm_rsize + NFS_MAXPKTHDR + 351 sizeof (u_int32_t)) * pktscale; 352 } 353 error = soreserve(so, sndreserve, rcvreserve); 354 if (error) 355 goto bad; 356 so->so_rcv.sb_flags |= SB_NOINTR; 357 so->so_snd.sb_flags |= SB_NOINTR; 358 359 /* Initialize other non-zero congestion variables */ 360 nmp->nm_srtt[0] = nmp->nm_srtt[1] = nmp->nm_srtt[2] = 361 nmp->nm_srtt[3] = (NFS_TIMEO << 3); 362 nmp->nm_sdrtt[0] = nmp->nm_sdrtt[1] = nmp->nm_sdrtt[2] = 363 nmp->nm_sdrtt[3] = 0; 364 nmp->nm_cwnd = NFS_MAXCWND / 2; /* Initial send window */ 365 nmp->nm_sent = 0; 366 nmp->nm_timeouts = 0; 367 return (0); 368 369 bad: 370 nfs_disconnect(nmp); 371 return (error); 372 } 373 374 /* 375 * Reconnect routine: 376 * Called when a connection is broken on a reliable protocol. 377 * - clean up the old socket 378 * - nfs_connect() again 379 * - set R_MUSTRESEND for all outstanding requests on mount point 380 * If this fails the mount point is DEAD! 381 * nb: Must be called with the nfs_sndlock() set on the mount point. 382 */ 383 static int 384 nfs_reconnect(rep) 385 register struct nfsreq *rep; 386 { 387 register struct nfsreq *rp; 388 register struct nfsmount *nmp = rep->r_nmp; 389 int error; 390 391 nfs_disconnect(nmp); 392 while ((error = nfs_connect(nmp, rep)) != 0) { 393 if (error == EINTR || error == ERESTART) 394 return (EINTR); 395 (void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0); 396 } 397 398 /* 399 * Loop through outstanding request list and fix up all requests 400 * on old socket. 401 */ 402 for (rp = nfs_reqq.tqh_first; rp != 0; rp = rp->r_chain.tqe_next) { 403 if (rp->r_nmp == nmp) 404 rp->r_flags |= R_MUSTRESEND; 405 } 406 return (0); 407 } 408 409 /* 410 * NFS disconnect. Clean up and unlink. 411 */ 412 void 413 nfs_disconnect(nmp) 414 register struct nfsmount *nmp; 415 { 416 register struct socket *so; 417 418 if (nmp->nm_so) { 419 so = nmp->nm_so; 420 nmp->nm_so = (struct socket *)0; 421 soshutdown(so, 2); 422 soclose(so); 423 } 424 } 425 426 void 427 nfs_safedisconnect(nmp) 428 struct nfsmount *nmp; 429 { 430 struct nfsreq dummyreq; 431 432 bzero(&dummyreq, sizeof(dummyreq)); 433 dummyreq.r_nmp = nmp; 434 nfs_rcvlock(&dummyreq); 435 nfs_disconnect(nmp); 436 nfs_rcvunlock(&dummyreq); 437 } 438 439 /* 440 * This is the nfs send routine. For connection based socket types, it 441 * must be called with an nfs_sndlock() on the socket. 442 * "rep == NULL" indicates that it has been called from a server. 443 * For the client side: 444 * - return EINTR if the RPC is terminated, 0 otherwise 445 * - set R_MUSTRESEND if the send fails for any reason 446 * - do any cleanup required by recoverable socket errors (?) 447 * For the server side: 448 * - return EINTR or ERESTART if interrupted by a signal 449 * - return EPIPE if a connection is lost for connection based sockets (TCP...) 450 * - do any cleanup required by recoverable socket errors (?) 451 */ 452 int 453 nfs_send(so, nam, top, rep) 454 register struct socket *so; 455 struct sockaddr *nam; 456 register struct mbuf *top; 457 struct nfsreq *rep; 458 { 459 struct sockaddr *sendnam; 460 int error, soflags, flags; 461 462 if (rep) { 463 if (rep->r_flags & R_SOFTTERM) { 464 m_freem(top); 465 return (EINTR); 466 } 467 if ((so = rep->r_nmp->nm_so) == NULL) { 468 rep->r_flags |= R_MUSTRESEND; 469 m_freem(top); 470 return (0); 471 } 472 rep->r_flags &= ~R_MUSTRESEND; 473 soflags = rep->r_nmp->nm_soflags; 474 } else 475 soflags = so->so_proto->pr_flags; 476 if ((soflags & PR_CONNREQUIRED) || (so->so_state & SS_ISCONNECTED)) 477 sendnam = (struct sockaddr *)0; 478 else 479 sendnam = nam; 480 if (so->so_type == SOCK_SEQPACKET) 481 flags = MSG_EOR; 482 else 483 flags = 0; 484 485 error = so->so_proto->pr_usrreqs->pru_sosend(so, sendnam, 0, top, 0, 486 flags, curproc /*XXX*/); 487 /* 488 * ENOBUFS for dgram sockets is transient and non fatal. 489 * No need to log, and no need to break a soft mount. 490 */ 491 if (error == ENOBUFS && so->so_type == SOCK_DGRAM) { 492 error = 0; 493 if (rep) /* do backoff retransmit on client */ 494 rep->r_flags |= R_MUSTRESEND; 495 } 496 497 if (error) { 498 if (rep) { 499 log(LOG_INFO, "nfs send error %d for server %s\n",error, 500 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 501 /* 502 * Deal with errors for the client side. 503 */ 504 if (rep->r_flags & R_SOFTTERM) 505 error = EINTR; 506 else 507 rep->r_flags |= R_MUSTRESEND; 508 } else 509 log(LOG_INFO, "nfsd send error %d\n", error); 510 511 /* 512 * Handle any recoverable (soft) socket errors here. (?) 513 */ 514 if (error != EINTR && error != ERESTART && 515 error != EWOULDBLOCK && error != EPIPE) 516 error = 0; 517 } 518 return (error); 519 } 520 521 /* 522 * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all 523 * done by soreceive(), but for SOCK_STREAM we must deal with the Record 524 * Mark and consolidate the data into a new mbuf list. 525 * nb: Sometimes TCP passes the data up to soreceive() in long lists of 526 * small mbufs. 527 * For SOCK_STREAM we must be very careful to read an entire record once 528 * we have read any of it, even if the system call has been interrupted. 529 */ 530 static int 531 nfs_receive(rep, aname, mp) 532 register struct nfsreq *rep; 533 struct sockaddr **aname; 534 struct mbuf **mp; 535 { 536 register struct socket *so; 537 struct uio auio; 538 struct iovec aio; 539 register struct mbuf *m; 540 struct mbuf *control; 541 u_int32_t len; 542 struct sockaddr **getnam; 543 int error, sotype, rcvflg; 544 struct proc *p = curproc; /* XXX */ 545 546 /* 547 * Set up arguments for soreceive() 548 */ 549 *mp = (struct mbuf *)0; 550 *aname = (struct sockaddr *)0; 551 sotype = rep->r_nmp->nm_sotype; 552 553 /* 554 * For reliable protocols, lock against other senders/receivers 555 * in case a reconnect is necessary. 556 * For SOCK_STREAM, first get the Record Mark to find out how much 557 * more there is to get. 558 * We must lock the socket against other receivers 559 * until we have an entire rpc request/reply. 560 */ 561 if (sotype != SOCK_DGRAM) { 562 error = nfs_sndlock(rep); 563 if (error) 564 return (error); 565 tryagain: 566 /* 567 * Check for fatal errors and resending request. 568 */ 569 /* 570 * Ugh: If a reconnect attempt just happened, nm_so 571 * would have changed. NULL indicates a failed 572 * attempt that has essentially shut down this 573 * mount point. 574 */ 575 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { 576 nfs_sndunlock(rep); 577 return (EINTR); 578 } 579 so = rep->r_nmp->nm_so; 580 if (!so) { 581 error = nfs_reconnect(rep); 582 if (error) { 583 nfs_sndunlock(rep); 584 return (error); 585 } 586 goto tryagain; 587 } 588 while (rep->r_flags & R_MUSTRESEND) { 589 m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); 590 nfsstats.rpcretries++; 591 error = nfs_send(so, rep->r_nmp->nm_nam, m, rep); 592 if (error) { 593 if (error == EINTR || error == ERESTART || 594 (error = nfs_reconnect(rep)) != 0) { 595 nfs_sndunlock(rep); 596 return (error); 597 } 598 goto tryagain; 599 } 600 } 601 nfs_sndunlock(rep); 602 if (sotype == SOCK_STREAM) { 603 aio.iov_base = (caddr_t) &len; 604 aio.iov_len = sizeof(u_int32_t); 605 auio.uio_iov = &aio; 606 auio.uio_iovcnt = 1; 607 auio.uio_segflg = UIO_SYSSPACE; 608 auio.uio_rw = UIO_READ; 609 auio.uio_offset = 0; 610 auio.uio_resid = sizeof(u_int32_t); 611 auio.uio_procp = p; 612 do { 613 rcvflg = MSG_WAITALL; 614 error = so->so_proto->pr_usrreqs->pru_soreceive 615 (so, (struct sockaddr **)0, &auio, 616 (struct mbuf **)0, (struct mbuf **)0, 617 &rcvflg); 618 if (error == EWOULDBLOCK && rep) { 619 if (rep->r_flags & R_SOFTTERM) 620 return (EINTR); 621 } 622 } while (error == EWOULDBLOCK); 623 if (!error && auio.uio_resid > 0) { 624 /* 625 * Don't log a 0 byte receive; it means 626 * that the socket has been closed, and 627 * can happen during normal operation 628 * (forcible unmount or Solaris server). 629 */ 630 if (auio.uio_resid != sizeof (u_int32_t)) 631 log(LOG_INFO, 632 "short receive (%d/%d) from nfs server %s\n", 633 (int)(sizeof(u_int32_t) - auio.uio_resid), 634 (int)sizeof(u_int32_t), 635 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 636 error = EPIPE; 637 } 638 if (error) 639 goto errout; 640 len = ntohl(len) & ~0x80000000; 641 /* 642 * This is SERIOUS! We are out of sync with the sender 643 * and forcing a disconnect/reconnect is all I can do. 644 */ 645 if (len > NFS_MAXPACKET) { 646 log(LOG_ERR, "%s (%d) from nfs server %s\n", 647 "impossible packet length", 648 len, 649 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 650 error = EFBIG; 651 goto errout; 652 } 653 auio.uio_resid = len; 654 do { 655 rcvflg = MSG_WAITALL; 656 error = so->so_proto->pr_usrreqs->pru_soreceive 657 (so, (struct sockaddr **)0, 658 &auio, mp, (struct mbuf **)0, &rcvflg); 659 } while (error == EWOULDBLOCK || error == EINTR || 660 error == ERESTART); 661 if (!error && auio.uio_resid > 0) { 662 if (len != auio.uio_resid) 663 log(LOG_INFO, 664 "short receive (%d/%d) from nfs server %s\n", 665 len - auio.uio_resid, len, 666 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 667 error = EPIPE; 668 } 669 } else { 670 /* 671 * NB: Since uio_resid is big, MSG_WAITALL is ignored 672 * and soreceive() will return when it has either a 673 * control msg or a data msg. 674 * We have no use for control msg., but must grab them 675 * and then throw them away so we know what is going 676 * on. 677 */ 678 auio.uio_resid = len = 100000000; /* Anything Big */ 679 auio.uio_procp = p; 680 do { 681 rcvflg = 0; 682 error = so->so_proto->pr_usrreqs->pru_soreceive 683 (so, (struct sockaddr **)0, 684 &auio, mp, &control, &rcvflg); 685 if (control) 686 m_freem(control); 687 if (error == EWOULDBLOCK && rep) { 688 if (rep->r_flags & R_SOFTTERM) 689 return (EINTR); 690 } 691 } while (error == EWOULDBLOCK || 692 (!error && *mp == NULL && control)); 693 if ((rcvflg & MSG_EOR) == 0) 694 printf("Egad!!\n"); 695 if (!error && *mp == NULL) 696 error = EPIPE; 697 len -= auio.uio_resid; 698 } 699 errout: 700 if (error && error != EINTR && error != ERESTART) { 701 m_freem(*mp); 702 *mp = (struct mbuf *)0; 703 if (error != EPIPE) 704 log(LOG_INFO, 705 "receive error %d from nfs server %s\n", 706 error, 707 rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); 708 error = nfs_sndlock(rep); 709 if (!error) { 710 error = nfs_reconnect(rep); 711 if (!error) 712 goto tryagain; 713 else 714 nfs_sndunlock(rep); 715 } 716 } 717 } else { 718 if ((so = rep->r_nmp->nm_so) == NULL) 719 return (EACCES); 720 if (so->so_state & SS_ISCONNECTED) 721 getnam = (struct sockaddr **)0; 722 else 723 getnam = aname; 724 auio.uio_resid = len = 1000000; 725 auio.uio_procp = p; 726 do { 727 rcvflg = 0; 728 error = so->so_proto->pr_usrreqs->pru_soreceive 729 (so, getnam, &auio, mp, 730 (struct mbuf **)0, &rcvflg); 731 if (error == EWOULDBLOCK && 732 (rep->r_flags & R_SOFTTERM)) 733 return (EINTR); 734 } while (error == EWOULDBLOCK); 735 len -= auio.uio_resid; 736 } 737 if (error) { 738 m_freem(*mp); 739 *mp = (struct mbuf *)0; 740 } 741 /* 742 * Search for any mbufs that are not a multiple of 4 bytes long 743 * or with m_data not longword aligned. 744 * These could cause pointer alignment problems, so copy them to 745 * well aligned mbufs. 746 */ 747 nfs_realign(mp, 5 * NFSX_UNSIGNED); 748 return (error); 749 } 750 751 /* 752 * Implement receipt of reply on a socket. 753 * We must search through the list of received datagrams matching them 754 * with outstanding requests using the xid, until ours is found. 755 */ 756 /* ARGSUSED */ 757 int 758 nfs_reply(myrep) 759 struct nfsreq *myrep; 760 { 761 register struct nfsreq *rep; 762 register struct nfsmount *nmp = myrep->r_nmp; 763 register int32_t t1; 764 struct mbuf *mrep, *md; 765 struct sockaddr *nam; 766 u_int32_t rxid, *tl; 767 caddr_t dpos, cp2; 768 int error; 769 770 /* 771 * Loop around until we get our own reply 772 */ 773 for (;;) { 774 /* 775 * Lock against other receivers so that I don't get stuck in 776 * sbwait() after someone else has received my reply for me. 777 * Also necessary for connection based protocols to avoid 778 * race conditions during a reconnect. 779 * If nfs_rcvlock() returns EALREADY, that means that 780 * the reply has already been recieved by another 781 * process and we can return immediately. In this 782 * case, the lock is not taken to avoid races with 783 * other processes. 784 */ 785 error = nfs_rcvlock(myrep); 786 if (error == EALREADY) 787 return (0); 788 if (error) 789 return (error); 790 /* 791 * Get the next Rpc reply off the socket 792 */ 793 error = nfs_receive(myrep, &nam, &mrep); 794 nfs_rcvunlock(myrep); 795 if (error) { 796 797 /* 798 * Ignore routing errors on connectionless protocols?? 799 */ 800 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { 801 nmp->nm_so->so_error = 0; 802 if (myrep->r_flags & R_GETONEREP) 803 return (0); 804 continue; 805 } 806 return (error); 807 } 808 if (nam) 809 FREE(nam, M_SONAME); 810 811 /* 812 * Get the xid and check that it is an rpc reply 813 */ 814 md = mrep; 815 dpos = mtod(md, caddr_t); 816 nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); 817 rxid = *tl++; 818 if (*tl != rpc_reply) { 819 #ifndef NFS_NOSERVER 820 if (nmp->nm_flag & NFSMNT_NQNFS) { 821 if (nqnfs_callback(nmp, mrep, md, dpos)) 822 nfsstats.rpcinvalid++; 823 } else { 824 nfsstats.rpcinvalid++; 825 m_freem(mrep); 826 } 827 #else 828 nfsstats.rpcinvalid++; 829 m_freem(mrep); 830 #endif 831 nfsmout: 832 if (myrep->r_flags & R_GETONEREP) 833 return (0); 834 continue; 835 } 836 837 /* 838 * Loop through the request list to match up the reply 839 * Iff no match, just drop the datagram 840 */ 841 for (rep = nfs_reqq.tqh_first; rep != 0; 842 rep = rep->r_chain.tqe_next) { 843 if (rep->r_mrep == NULL && rxid == rep->r_xid) { 844 /* Found it.. */ 845 rep->r_mrep = mrep; 846 rep->r_md = md; 847 rep->r_dpos = dpos; 848 if (nfsrtton) { 849 struct rttl *rt; 850 851 rt = &nfsrtt.rttl[nfsrtt.pos]; 852 rt->proc = rep->r_procnum; 853 rt->rto = NFS_RTO(nmp, proct[rep->r_procnum]); 854 rt->sent = nmp->nm_sent; 855 rt->cwnd = nmp->nm_cwnd; 856 rt->srtt = nmp->nm_srtt[proct[rep->r_procnum] - 1]; 857 rt->sdrtt = nmp->nm_sdrtt[proct[rep->r_procnum] - 1]; 858 rt->fsid = nmp->nm_mountp->mnt_stat.f_fsid; 859 getmicrotime(&rt->tstamp); 860 if (rep->r_flags & R_TIMING) 861 rt->rtt = rep->r_rtt; 862 else 863 rt->rtt = 1000000; 864 nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; 865 } 866 /* 867 * Update congestion window. 868 * Do the additive increase of 869 * one rpc/rtt. 870 */ 871 if (nmp->nm_cwnd <= nmp->nm_sent) { 872 nmp->nm_cwnd += 873 (NFS_CWNDSCALE * NFS_CWNDSCALE + 874 (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; 875 if (nmp->nm_cwnd > NFS_MAXCWND) 876 nmp->nm_cwnd = NFS_MAXCWND; 877 } 878 if (rep->r_flags & R_SENT) { 879 rep->r_flags &= ~R_SENT; 880 nmp->nm_sent -= NFS_CWNDSCALE; 881 } 882 /* 883 * Update rtt using a gain of 0.125 on the mean 884 * and a gain of 0.25 on the deviation. 885 */ 886 if (rep->r_flags & R_TIMING) { 887 /* 888 * Since the timer resolution of 889 * NFS_HZ is so course, it can often 890 * result in r_rtt == 0. Since 891 * r_rtt == N means that the actual 892 * rtt is between N+dt and N+2-dt ticks, 893 * add 1. 894 */ 895 t1 = rep->r_rtt + 1; 896 t1 -= (NFS_SRTT(rep) >> 3); 897 NFS_SRTT(rep) += t1; 898 if (t1 < 0) 899 t1 = -t1; 900 t1 -= (NFS_SDRTT(rep) >> 2); 901 NFS_SDRTT(rep) += t1; 902 } 903 nmp->nm_timeouts = 0; 904 break; 905 } 906 } 907 /* 908 * If not matched to a request, drop it. 909 * If it's mine, get out. 910 */ 911 if (rep == 0) { 912 nfsstats.rpcunexpected++; 913 m_freem(mrep); 914 } else if (rep == myrep) { 915 if (rep->r_mrep == NULL) 916 panic("nfsreply nil"); 917 return (0); 918 } 919 if (myrep->r_flags & R_GETONEREP) 920 return (0); 921 } 922 } 923 924 /* 925 * nfs_request - goes something like this 926 * - fill in request struct 927 * - links it into list 928 * - calls nfs_send() for first transmit 929 * - calls nfs_receive() to get reply 930 * - break down rpc header and return with nfs reply pointed to 931 * by mrep or error 932 * nb: always frees up mreq mbuf list 933 */ 934 int 935 nfs_request(vp, mrest, procnum, procp, cred, mrp, mdp, dposp) 936 struct vnode *vp; 937 struct mbuf *mrest; 938 int procnum; 939 struct proc *procp; 940 struct ucred *cred; 941 struct mbuf **mrp; 942 struct mbuf **mdp; 943 caddr_t *dposp; 944 { 945 register struct mbuf *mrep, *m2; 946 register struct nfsreq *rep; 947 register u_int32_t *tl; 948 register int i; 949 struct nfsmount *nmp; 950 struct mbuf *m, *md, *mheadend; 951 struct nfsnode *np; 952 char nickv[RPCX_NICKVERF]; 953 time_t reqtime, waituntil; 954 caddr_t dpos, cp2; 955 int t1, nqlflag, cachable, s, error = 0, mrest_len, auth_len, auth_type; 956 int trylater_delay = NQ_TRYLATERDEL, trylater_cnt = 0, failed_auth = 0; 957 int verf_len, verf_type; 958 u_int32_t *xidp; 959 u_quad_t frev; 960 char *auth_str, *verf_str; 961 NFSKERBKEY_T key; /* save session key */ 962 963 /* Reject requests while attempting a forced unmount. */ 964 if (vp->v_mount->mnt_kern_flag & MNTK_UNMOUNTF) { 965 m_freem(mrest); 966 return (ESTALE); 967 } 968 nmp = VFSTONFS(vp->v_mount); 969 MALLOC(rep, struct nfsreq *, sizeof(struct nfsreq), M_NFSREQ, M_WAITOK); 970 rep->r_nmp = nmp; 971 rep->r_vp = vp; 972 rep->r_procp = procp; 973 rep->r_procnum = procnum; 974 i = 0; 975 m = mrest; 976 while (m) { 977 i += m->m_len; 978 m = m->m_next; 979 } 980 mrest_len = i; 981 982 /* 983 * Get the RPC header with authorization. 984 */ 985 kerbauth: 986 verf_str = auth_str = (char *)0; 987 if (nmp->nm_flag & NFSMNT_KERB) { 988 verf_str = nickv; 989 verf_len = sizeof (nickv); 990 auth_type = RPCAUTH_KERB4; 991 bzero((caddr_t)key, sizeof (key)); 992 if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, 993 &auth_len, verf_str, verf_len)) { 994 error = nfs_getauth(nmp, rep, cred, &auth_str, 995 &auth_len, verf_str, &verf_len, key); 996 if (error) { 997 free((caddr_t)rep, M_NFSREQ); 998 m_freem(mrest); 999 return (error); 1000 } 1001 } 1002 } else { 1003 auth_type = RPCAUTH_UNIX; 1004 if (cred->cr_ngroups < 1) 1005 panic("nfsreq nogrps"); 1006 auth_len = ((((cred->cr_ngroups - 1) > nmp->nm_numgrps) ? 1007 nmp->nm_numgrps : (cred->cr_ngroups - 1)) << 2) + 1008 5 * NFSX_UNSIGNED; 1009 } 1010 m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, 1011 auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xidp); 1012 if (auth_str) 1013 free(auth_str, M_TEMP); 1014 1015 /* 1016 * For stream protocols, insert a Sun RPC Record Mark. 1017 */ 1018 if (nmp->nm_sotype == SOCK_STREAM) { 1019 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 1020 *mtod(m, u_int32_t *) = htonl(0x80000000 | 1021 (m->m_pkthdr.len - NFSX_UNSIGNED)); 1022 } 1023 rep->r_mreq = m; 1024 rep->r_xid = *xidp; 1025 tryagain: 1026 if (nmp->nm_flag & NFSMNT_SOFT) 1027 rep->r_retry = nmp->nm_retry; 1028 else 1029 rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ 1030 rep->r_rtt = rep->r_rexmit = 0; 1031 if (proct[procnum] > 0) 1032 rep->r_flags = R_TIMING; 1033 else 1034 rep->r_flags = 0; 1035 rep->r_mrep = NULL; 1036 1037 /* 1038 * Do the client side RPC. 1039 */ 1040 nfsstats.rpcrequests++; 1041 /* 1042 * Chain request into list of outstanding requests. Be sure 1043 * to put it LAST so timer finds oldest requests first. 1044 */ 1045 s = splsoftclock(); 1046 TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); 1047 1048 /* Get send time for nqnfs */ 1049 reqtime = time_second; 1050 1051 /* 1052 * If backing off another request or avoiding congestion, don't 1053 * send this one now but let timer do it. If not timing a request, 1054 * do it now. 1055 */ 1056 if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || 1057 (nmp->nm_flag & NFSMNT_DUMBTIMR) || 1058 nmp->nm_sent < nmp->nm_cwnd)) { 1059 splx(s); 1060 if (nmp->nm_soflags & PR_CONNREQUIRED) 1061 error = nfs_sndlock(rep); 1062 if (!error) { 1063 m2 = m_copym(m, 0, M_COPYALL, M_WAIT); 1064 error = nfs_send(nmp->nm_so, nmp->nm_nam, m2, rep); 1065 if (nmp->nm_soflags & PR_CONNREQUIRED) 1066 nfs_sndunlock(rep); 1067 } 1068 if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { 1069 nmp->nm_sent += NFS_CWNDSCALE; 1070 rep->r_flags |= R_SENT; 1071 } 1072 } else { 1073 splx(s); 1074 rep->r_rtt = -1; 1075 } 1076 1077 /* 1078 * Wait for the reply from our send or the timer's. 1079 */ 1080 if (!error || error == EPIPE) 1081 error = nfs_reply(rep); 1082 1083 /* 1084 * RPC done, unlink the request. 1085 */ 1086 s = splsoftclock(); 1087 TAILQ_REMOVE(&nfs_reqq, rep, r_chain); 1088 splx(s); 1089 1090 /* 1091 * Decrement the outstanding request count. 1092 */ 1093 if (rep->r_flags & R_SENT) { 1094 rep->r_flags &= ~R_SENT; /* paranoia */ 1095 nmp->nm_sent -= NFS_CWNDSCALE; 1096 } 1097 1098 /* 1099 * If there was a successful reply and a tprintf msg. 1100 * tprintf a response. 1101 */ 1102 if (!error && (rep->r_flags & R_TPRINTFMSG)) 1103 nfs_msg(rep->r_procp, nmp->nm_mountp->mnt_stat.f_mntfromname, 1104 "is alive again"); 1105 mrep = rep->r_mrep; 1106 md = rep->r_md; 1107 dpos = rep->r_dpos; 1108 if (error) { 1109 m_freem(rep->r_mreq); 1110 free((caddr_t)rep, M_NFSREQ); 1111 return (error); 1112 } 1113 1114 /* 1115 * break down the rpc header and check if ok 1116 */ 1117 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1118 if (*tl++ == rpc_msgdenied) { 1119 if (*tl == rpc_mismatch) 1120 error = EOPNOTSUPP; 1121 else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { 1122 if (!failed_auth) { 1123 failed_auth++; 1124 mheadend->m_next = (struct mbuf *)0; 1125 m_freem(mrep); 1126 m_freem(rep->r_mreq); 1127 goto kerbauth; 1128 } else 1129 error = EAUTH; 1130 } else 1131 error = EACCES; 1132 m_freem(mrep); 1133 m_freem(rep->r_mreq); 1134 free((caddr_t)rep, M_NFSREQ); 1135 return (error); 1136 } 1137 1138 /* 1139 * Grab any Kerberos verifier, otherwise just throw it away. 1140 */ 1141 verf_type = fxdr_unsigned(int, *tl++); 1142 i = fxdr_unsigned(int32_t, *tl); 1143 if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { 1144 error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); 1145 if (error) 1146 goto nfsmout; 1147 } else if (i > 0) 1148 nfsm_adv(nfsm_rndup(i)); 1149 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1150 /* 0 == ok */ 1151 if (*tl == 0) { 1152 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1153 if (*tl != 0) { 1154 error = fxdr_unsigned(int, *tl); 1155 if ((nmp->nm_flag & NFSMNT_NFSV3) && 1156 error == NFSERR_TRYLATER) { 1157 m_freem(mrep); 1158 error = 0; 1159 waituntil = time_second + trylater_delay; 1160 while (time_second < waituntil) 1161 (void) tsleep((caddr_t)&lbolt, 1162 PSOCK, "nqnfstry", 0); 1163 trylater_delay *= nfs_backoff[trylater_cnt]; 1164 if (trylater_cnt < 7) 1165 trylater_cnt++; 1166 /* 1167 * Generate a new RPC XID before retrying the request 1168 * on an NFSv3 JUKEBOX error. If we don't do this, the 1169 * duplicate request cache on the server will simply 1170 * replay the cached reply from the dupreq cache, and 1171 * the client request hangs in this loop forever. 1172 */ 1173 rep->r_xid = *xidp = txdr_unsigned(nfs_xid_gen()); 1174 goto tryagain; 1175 } 1176 1177 /* 1178 * If the File Handle was stale, invalidate the 1179 * lookup cache, just in case. 1180 */ 1181 if (error == ESTALE) 1182 cache_purge(vp); 1183 if (nmp->nm_flag & NFSMNT_NFSV3) { 1184 *mrp = mrep; 1185 *mdp = md; 1186 *dposp = dpos; 1187 error |= NFSERR_RETERR; 1188 } else 1189 m_freem(mrep); 1190 m_freem(rep->r_mreq); 1191 free((caddr_t)rep, M_NFSREQ); 1192 return (error); 1193 } 1194 1195 /* 1196 * For nqnfs, get any lease in reply 1197 */ 1198 if (nmp->nm_flag & NFSMNT_NQNFS) { 1199 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1200 if (*tl) { 1201 np = VTONFS(vp); 1202 nqlflag = fxdr_unsigned(int, *tl); 1203 nfsm_dissect(tl, u_int32_t *, 4*NFSX_UNSIGNED); 1204 cachable = fxdr_unsigned(int, *tl++); 1205 reqtime += fxdr_unsigned(int, *tl++); 1206 if (reqtime > time_second) { 1207 frev = fxdr_hyper(tl); 1208 nqnfs_clientlease(nmp, np, nqlflag, 1209 cachable, reqtime, frev); 1210 } 1211 } 1212 } 1213 *mrp = mrep; 1214 *mdp = md; 1215 *dposp = dpos; 1216 m_freem(rep->r_mreq); 1217 FREE((caddr_t)rep, M_NFSREQ); 1218 return (0); 1219 } 1220 m_freem(mrep); 1221 error = EPROTONOSUPPORT; 1222 nfsmout: 1223 m_freem(rep->r_mreq); 1224 free((caddr_t)rep, M_NFSREQ); 1225 return (error); 1226 } 1227 1228 #ifndef NFS_NOSERVER 1229 /* 1230 * Generate the rpc reply header 1231 * siz arg. is used to decide if adding a cluster is worthwhile 1232 */ 1233 int 1234 nfs_rephead(siz, nd, slp, err, cache, frev, mrq, mbp, bposp) 1235 int siz; 1236 struct nfsrv_descript *nd; 1237 struct nfssvc_sock *slp; 1238 int err; 1239 int cache; 1240 u_quad_t *frev; 1241 struct mbuf **mrq; 1242 struct mbuf **mbp; 1243 caddr_t *bposp; 1244 { 1245 register u_int32_t *tl; 1246 register struct mbuf *mreq; 1247 caddr_t bpos; 1248 struct mbuf *mb, *mb2; 1249 1250 MGETHDR(mreq, M_WAIT, MT_DATA); 1251 mb = mreq; 1252 /* 1253 * If this is a big reply, use a cluster else 1254 * try and leave leading space for the lower level headers. 1255 */ 1256 siz += RPC_REPLYSIZ; 1257 if ((max_hdr + siz) >= MINCLSIZE) { 1258 MCLGET(mreq, M_WAIT); 1259 } else 1260 mreq->m_data += max_hdr; 1261 tl = mtod(mreq, u_int32_t *); 1262 mreq->m_len = 6 * NFSX_UNSIGNED; 1263 bpos = ((caddr_t)tl) + mreq->m_len; 1264 *tl++ = txdr_unsigned(nd->nd_retxid); 1265 *tl++ = rpc_reply; 1266 if (err == ERPCMISMATCH || (err & NFSERR_AUTHERR)) { 1267 *tl++ = rpc_msgdenied; 1268 if (err & NFSERR_AUTHERR) { 1269 *tl++ = rpc_autherr; 1270 *tl = txdr_unsigned(err & ~NFSERR_AUTHERR); 1271 mreq->m_len -= NFSX_UNSIGNED; 1272 bpos -= NFSX_UNSIGNED; 1273 } else { 1274 *tl++ = rpc_mismatch; 1275 *tl++ = txdr_unsigned(RPC_VER2); 1276 *tl = txdr_unsigned(RPC_VER2); 1277 } 1278 } else { 1279 *tl++ = rpc_msgaccepted; 1280 1281 /* 1282 * For Kerberos authentication, we must send the nickname 1283 * verifier back, otherwise just RPCAUTH_NULL. 1284 */ 1285 if (nd->nd_flag & ND_KERBFULL) { 1286 register struct nfsuid *nuidp; 1287 struct timeval ktvin, ktvout; 1288 1289 for (nuidp = NUIDHASH(slp, nd->nd_cr.cr_uid)->lh_first; 1290 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1291 if (nuidp->nu_cr.cr_uid == nd->nd_cr.cr_uid && 1292 (!nd->nd_nam2 || netaddr_match(NU_NETFAM(nuidp), 1293 &nuidp->nu_haddr, nd->nd_nam2))) 1294 break; 1295 } 1296 if (nuidp) { 1297 ktvin.tv_sec = 1298 txdr_unsigned(nuidp->nu_timestamp.tv_sec - 1); 1299 ktvin.tv_usec = 1300 txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1301 1302 /* 1303 * Encrypt the timestamp in ecb mode using the 1304 * session key. 1305 */ 1306 #ifdef NFSKERB 1307 XXX 1308 #endif 1309 1310 *tl++ = rpc_auth_kerb; 1311 *tl++ = txdr_unsigned(3 * NFSX_UNSIGNED); 1312 *tl = ktvout.tv_sec; 1313 nfsm_build(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1314 *tl++ = ktvout.tv_usec; 1315 *tl++ = txdr_unsigned(nuidp->nu_cr.cr_uid); 1316 } else { 1317 *tl++ = 0; 1318 *tl++ = 0; 1319 } 1320 } else { 1321 *tl++ = 0; 1322 *tl++ = 0; 1323 } 1324 switch (err) { 1325 case EPROGUNAVAIL: 1326 *tl = txdr_unsigned(RPC_PROGUNAVAIL); 1327 break; 1328 case EPROGMISMATCH: 1329 *tl = txdr_unsigned(RPC_PROGMISMATCH); 1330 nfsm_build(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1331 if (nd->nd_flag & ND_NQNFS) { 1332 *tl++ = txdr_unsigned(3); 1333 *tl = txdr_unsigned(3); 1334 } else { 1335 *tl++ = txdr_unsigned(2); 1336 *tl = txdr_unsigned(3); 1337 } 1338 break; 1339 case EPROCUNAVAIL: 1340 *tl = txdr_unsigned(RPC_PROCUNAVAIL); 1341 break; 1342 case EBADRPC: 1343 *tl = txdr_unsigned(RPC_GARBAGE); 1344 break; 1345 default: 1346 *tl = 0; 1347 if (err != NFSERR_RETVOID) { 1348 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1349 if (err) 1350 *tl = txdr_unsigned(nfsrv_errmap(nd, err)); 1351 else 1352 *tl = 0; 1353 } 1354 break; 1355 }; 1356 } 1357 1358 /* 1359 * For nqnfs, piggyback lease as requested. 1360 */ 1361 if ((nd->nd_flag & ND_NQNFS) && err == 0) { 1362 if (nd->nd_flag & ND_LEASE) { 1363 nfsm_build(tl, u_int32_t *, 5 * NFSX_UNSIGNED); 1364 *tl++ = txdr_unsigned(nd->nd_flag & ND_LEASE); 1365 *tl++ = txdr_unsigned(cache); 1366 *tl++ = txdr_unsigned(nd->nd_duration); 1367 txdr_hyper(*frev, tl); 1368 } else { 1369 nfsm_build(tl, u_int32_t *, NFSX_UNSIGNED); 1370 *tl = 0; 1371 } 1372 } 1373 if (mrq != NULL) 1374 *mrq = mreq; 1375 *mbp = mb; 1376 *bposp = bpos; 1377 if (err != 0 && err != NFSERR_RETVOID) 1378 nfsstats.srvrpc_errs++; 1379 return (0); 1380 } 1381 1382 1383 #endif /* NFS_NOSERVER */ 1384 /* 1385 * Nfs timer routine 1386 * Scan the nfsreq list and retranmit any requests that have timed out 1387 * To avoid retransmission attempts on STREAM sockets (in the future) make 1388 * sure to set the r_retry field to 0 (implies nm_retry == 0). 1389 */ 1390 void 1391 nfs_timer(arg) 1392 void *arg; /* never used */ 1393 { 1394 register struct nfsreq *rep; 1395 register struct mbuf *m; 1396 register struct socket *so; 1397 register struct nfsmount *nmp; 1398 register int timeo; 1399 int s, error; 1400 #ifndef NFS_NOSERVER 1401 static long lasttime = 0; 1402 register struct nfssvc_sock *slp; 1403 u_quad_t cur_usec; 1404 #endif /* NFS_NOSERVER */ 1405 struct proc *p = &proc0; /* XXX for credentials, will break if sleep */ 1406 1407 s = splnet(); 1408 for (rep = nfs_reqq.tqh_first; rep != 0; rep = rep->r_chain.tqe_next) { 1409 nmp = rep->r_nmp; 1410 if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) 1411 continue; 1412 if (nfs_sigintr(nmp, rep, rep->r_procp)) { 1413 nfs_softterm(rep); 1414 continue; 1415 } 1416 if (rep->r_rtt >= 0) { 1417 rep->r_rtt++; 1418 if (nmp->nm_flag & NFSMNT_DUMBTIMR) 1419 timeo = nmp->nm_timeo; 1420 else 1421 timeo = NFS_RTO(nmp, proct[rep->r_procnum]); 1422 if (nmp->nm_timeouts > 0) 1423 timeo *= nfs_backoff[nmp->nm_timeouts - 1]; 1424 if (rep->r_rtt <= timeo) 1425 continue; 1426 if (nmp->nm_timeouts < 8) 1427 nmp->nm_timeouts++; 1428 } 1429 /* 1430 * Check for server not responding 1431 */ 1432 if ((rep->r_flags & R_TPRINTFMSG) == 0 && 1433 rep->r_rexmit > nmp->nm_deadthresh) { 1434 nfs_msg(rep->r_procp, 1435 nmp->nm_mountp->mnt_stat.f_mntfromname, 1436 "not responding"); 1437 rep->r_flags |= R_TPRINTFMSG; 1438 } 1439 if (rep->r_rexmit >= rep->r_retry) { /* too many */ 1440 nfsstats.rpctimeouts++; 1441 nfs_softterm(rep); 1442 continue; 1443 } 1444 if (nmp->nm_sotype != SOCK_DGRAM) { 1445 if (++rep->r_rexmit > NFS_MAXREXMIT) 1446 rep->r_rexmit = NFS_MAXREXMIT; 1447 continue; 1448 } 1449 if ((so = nmp->nm_so) == NULL) 1450 continue; 1451 1452 /* 1453 * If there is enough space and the window allows.. 1454 * Resend it 1455 * Set r_rtt to -1 in case we fail to send it now. 1456 */ 1457 rep->r_rtt = -1; 1458 if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len && 1459 ((nmp->nm_flag & NFSMNT_DUMBTIMR) || 1460 (rep->r_flags & R_SENT) || 1461 nmp->nm_sent < nmp->nm_cwnd) && 1462 (m = m_copym(rep->r_mreq, 0, M_COPYALL, M_DONTWAIT))){ 1463 if ((nmp->nm_flag & NFSMNT_NOCONN) == 0) 1464 error = (*so->so_proto->pr_usrreqs->pru_send) 1465 (so, 0, m, (struct sockaddr *)0, 1466 (struct mbuf *)0, p); 1467 else 1468 error = (*so->so_proto->pr_usrreqs->pru_send) 1469 (so, 0, m, nmp->nm_nam, (struct mbuf *)0, 1470 p); 1471 if (error) { 1472 if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) 1473 so->so_error = 0; 1474 } else { 1475 /* 1476 * Iff first send, start timing 1477 * else turn timing off, backoff timer 1478 * and divide congestion window by 2. 1479 */ 1480 if (rep->r_flags & R_SENT) { 1481 rep->r_flags &= ~R_TIMING; 1482 if (++rep->r_rexmit > NFS_MAXREXMIT) 1483 rep->r_rexmit = NFS_MAXREXMIT; 1484 nmp->nm_cwnd >>= 1; 1485 if (nmp->nm_cwnd < NFS_CWNDSCALE) 1486 nmp->nm_cwnd = NFS_CWNDSCALE; 1487 nfsstats.rpcretries++; 1488 } else { 1489 rep->r_flags |= R_SENT; 1490 nmp->nm_sent += NFS_CWNDSCALE; 1491 } 1492 rep->r_rtt = 0; 1493 } 1494 } 1495 } 1496 #ifndef NFS_NOSERVER 1497 /* 1498 * Call the nqnfs server timer once a second to handle leases. 1499 */ 1500 if (lasttime != time_second) { 1501 lasttime = time_second; 1502 nqnfs_serverd(); 1503 } 1504 1505 /* 1506 * Scan the write gathering queues for writes that need to be 1507 * completed now. 1508 */ 1509 cur_usec = nfs_curusec(); 1510 for (slp = nfssvc_sockhead.tqh_first; slp != 0; 1511 slp = slp->ns_chain.tqe_next) { 1512 if (slp->ns_tq.lh_first && slp->ns_tq.lh_first->nd_time<=cur_usec) 1513 nfsrv_wakenfsd(slp); 1514 } 1515 #endif /* NFS_NOSERVER */ 1516 splx(s); 1517 nfs_timer_handle = timeout(nfs_timer, (void *)0, nfs_ticks); 1518 } 1519 1520 /* 1521 * Mark all of an nfs mount's outstanding requests with R_SOFTTERM and 1522 * wait for all requests to complete. This is used by forced unmounts 1523 * to terminate any outstanding RPCs. 1524 */ 1525 int 1526 nfs_nmcancelreqs(nmp) 1527 struct nfsmount *nmp; 1528 { 1529 struct nfsreq *req; 1530 int i, s; 1531 1532 s = splnet(); 1533 TAILQ_FOREACH(req, &nfs_reqq, r_chain) { 1534 if (nmp != req->r_nmp || req->r_mrep != NULL || 1535 (req->r_flags & R_SOFTTERM)) 1536 continue; 1537 nfs_softterm(req); 1538 } 1539 splx(s); 1540 1541 for (i = 0; i < 30; i++) { 1542 s = splnet(); 1543 TAILQ_FOREACH(req, &nfs_reqq, r_chain) { 1544 if (nmp == req->r_nmp) 1545 break; 1546 } 1547 splx(s); 1548 if (req == NULL) 1549 return (0); 1550 tsleep(&lbolt, PSOCK, "nfscancel", 0); 1551 } 1552 return (EBUSY); 1553 } 1554 1555 /* 1556 * Flag a request as being about to terminate (due to NFSMNT_INT/NFSMNT_SOFT). 1557 * The nm_send count is decremented now to avoid deadlocks when the process in 1558 * soreceive() hasn't yet managed to send its own request. 1559 */ 1560 1561 static void 1562 nfs_softterm(rep) 1563 struct nfsreq *rep; 1564 { 1565 rep->r_flags |= R_SOFTTERM; 1566 1567 if (rep->r_flags & R_SENT) { 1568 rep->r_nmp->nm_sent -= NFS_CWNDSCALE; 1569 rep->r_flags &= ~R_SENT; 1570 } 1571 } 1572 1573 /* 1574 * Test for a termination condition pending on the process. 1575 * This is used for NFSMNT_INT mounts. 1576 */ 1577 int 1578 nfs_sigintr(nmp, rep, p) 1579 struct nfsmount *nmp; 1580 struct nfsreq *rep; 1581 register struct proc *p; 1582 { 1583 sigset_t tmpset; 1584 1585 if (rep && (rep->r_flags & R_SOFTTERM)) 1586 return (EINTR); 1587 /* Terminate all requests while attempting a forced unmount. */ 1588 if (nmp->nm_mountp->mnt_kern_flag & MNTK_UNMOUNTF) 1589 return (EINTR); 1590 if (!(nmp->nm_flag & NFSMNT_INT)) 1591 return (0); 1592 if (p == NULL) 1593 return (0); 1594 1595 tmpset = p->p_siglist; 1596 SIGSETNAND(tmpset, p->p_sigmask); 1597 SIGSETNAND(tmpset, p->p_sigignore); 1598 if (SIGNOTEMPTY(p->p_siglist) && NFSINT_SIGMASK(tmpset)) 1599 return (EINTR); 1600 1601 return (0); 1602 } 1603 1604 /* 1605 * Lock a socket against others. 1606 * Necessary for STREAM sockets to ensure you get an entire rpc request/reply 1607 * and also to avoid race conditions between the processes with nfs requests 1608 * in progress when a reconnect is necessary. 1609 */ 1610 int 1611 nfs_sndlock(rep) 1612 struct nfsreq *rep; 1613 { 1614 register int *statep = &rep->r_nmp->nm_state; 1615 struct proc *p; 1616 int slpflag = 0, slptimeo = 0; 1617 1618 p = rep->r_procp; 1619 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1620 slpflag = PCATCH; 1621 while (*statep & NFSSTA_SNDLOCK) { 1622 if (nfs_sigintr(rep->r_nmp, rep, p)) 1623 return (EINTR); 1624 *statep |= NFSSTA_WANTSND; 1625 (void) tsleep((caddr_t)statep, slpflag | (PZERO - 1), 1626 "nfsndlck", slptimeo); 1627 if (slpflag == PCATCH) { 1628 slpflag = 0; 1629 slptimeo = 2 * hz; 1630 } 1631 } 1632 /* Always fail if our request has been cancelled. */ 1633 if ((rep->r_flags & R_SOFTTERM)) 1634 return (EINTR); 1635 *statep |= NFSSTA_SNDLOCK; 1636 return (0); 1637 } 1638 1639 /* 1640 * Unlock the stream socket for others. 1641 */ 1642 void 1643 nfs_sndunlock(rep) 1644 struct nfsreq *rep; 1645 { 1646 register int *statep = &rep->r_nmp->nm_state; 1647 1648 if ((*statep & NFSSTA_SNDLOCK) == 0) 1649 panic("nfs sndunlock"); 1650 *statep &= ~NFSSTA_SNDLOCK; 1651 if (*statep & NFSSTA_WANTSND) { 1652 *statep &= ~NFSSTA_WANTSND; 1653 wakeup((caddr_t)statep); 1654 } 1655 } 1656 1657 static int 1658 nfs_rcvlock(rep) 1659 register struct nfsreq *rep; 1660 { 1661 register int *statep = &rep->r_nmp->nm_state; 1662 int slpflag, slptimeo = 0; 1663 1664 if (rep->r_nmp->nm_flag & NFSMNT_INT) 1665 slpflag = PCATCH; 1666 else 1667 slpflag = 0; 1668 while (*statep & NFSSTA_RCVLOCK) { 1669 if (nfs_sigintr(rep->r_nmp, rep, rep->r_procp)) 1670 return (EINTR); 1671 *statep |= NFSSTA_WANTRCV; 1672 (void) tsleep((caddr_t)statep, slpflag | (PZERO - 1), "nfsrcvlk", 1673 slptimeo); 1674 /* 1675 * If our reply was recieved while we were sleeping, 1676 * then just return without taking the lock to avoid a 1677 * situation where a single iod could 'capture' the 1678 * recieve lock. 1679 */ 1680 if (rep->r_mrep != NULL) 1681 return (EALREADY); 1682 if (slpflag == PCATCH) { 1683 slpflag = 0; 1684 slptimeo = 2 * hz; 1685 } 1686 } 1687 *statep |= NFSSTA_RCVLOCK; 1688 return (0); 1689 } 1690 1691 /* 1692 * Unlock the stream socket for others. 1693 */ 1694 static void 1695 nfs_rcvunlock(rep) 1696 register struct nfsreq *rep; 1697 { 1698 register int *statep = &rep->r_nmp->nm_state; 1699 1700 if ((*statep & NFSSTA_RCVLOCK) == 0) 1701 panic("nfs rcvunlock"); 1702 *statep &= ~NFSSTA_RCVLOCK; 1703 if (*statep & NFSSTA_WANTRCV) { 1704 *statep &= ~NFSSTA_WANTRCV; 1705 wakeup((caddr_t)statep); 1706 } 1707 } 1708 1709 /* 1710 * nfs_realign: 1711 * 1712 * Check for badly aligned mbuf data and realign by copying the unaligned 1713 * portion of the data into a new mbuf chain and freeing the portions 1714 * of the old chain that were replaced. 1715 * 1716 * We cannot simply realign the data within the existing mbuf chain 1717 * because the underlying buffers may contain other rpc commands and 1718 * we cannot afford to overwrite them. 1719 * 1720 * We would prefer to avoid this situation entirely. The situation does 1721 * not occur with NFS/UDP and is supposed to only occassionally occur 1722 * with TCP. Use vfs.nfs.realign_count and realign_test to check this. 1723 */ 1724 static void 1725 nfs_realign(pm, hsiz) 1726 register struct mbuf **pm; 1727 int hsiz; 1728 { 1729 struct mbuf *m; 1730 struct mbuf *n = NULL; 1731 int off = 0; 1732 1733 ++nfs_realign_test; 1734 1735 while ((m = *pm) != NULL) { 1736 if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) { 1737 MGET(n, M_WAIT, MT_DATA); 1738 if (m->m_len >= MINCLSIZE) { 1739 MCLGET(n, M_WAIT); 1740 } 1741 n->m_len = 0; 1742 break; 1743 } 1744 pm = &m->m_next; 1745 } 1746 1747 /* 1748 * If n is non-NULL, loop on m copying data, then replace the 1749 * portion of the chain that had to be realigned. 1750 */ 1751 if (n != NULL) { 1752 ++nfs_realign_count; 1753 while (m) { 1754 m_copyback(n, off, m->m_len, mtod(m, caddr_t)); 1755 off += m->m_len; 1756 m = m->m_next; 1757 } 1758 m_freem(*pm); 1759 *pm = n; 1760 } 1761 } 1762 1763 #ifndef NFS_NOSERVER 1764 1765 /* 1766 * Parse an RPC request 1767 * - verify it 1768 * - fill in the cred struct. 1769 */ 1770 int 1771 nfs_getreq(nd, nfsd, has_header) 1772 register struct nfsrv_descript *nd; 1773 struct nfsd *nfsd; 1774 int has_header; 1775 { 1776 register int len, i; 1777 register u_int32_t *tl; 1778 register int32_t t1; 1779 struct uio uio; 1780 struct iovec iov; 1781 caddr_t dpos, cp2, cp; 1782 u_int32_t nfsvers, auth_type; 1783 uid_t nickuid; 1784 int error = 0, nqnfs = 0, ticklen; 1785 struct mbuf *mrep, *md; 1786 register struct nfsuid *nuidp; 1787 struct timeval tvin, tvout; 1788 #if 0 /* until encrypted keys are implemented */ 1789 NFSKERBKEYSCHED_T keys; /* stores key schedule */ 1790 #endif 1791 1792 mrep = nd->nd_mrep; 1793 md = nd->nd_md; 1794 dpos = nd->nd_dpos; 1795 if (has_header) { 1796 nfsm_dissect(tl, u_int32_t *, 10 * NFSX_UNSIGNED); 1797 nd->nd_retxid = fxdr_unsigned(u_int32_t, *tl++); 1798 if (*tl++ != rpc_call) { 1799 m_freem(mrep); 1800 return (EBADRPC); 1801 } 1802 } else 1803 nfsm_dissect(tl, u_int32_t *, 8 * NFSX_UNSIGNED); 1804 nd->nd_repstat = 0; 1805 nd->nd_flag = 0; 1806 if (*tl++ != rpc_vers) { 1807 nd->nd_repstat = ERPCMISMATCH; 1808 nd->nd_procnum = NFSPROC_NOOP; 1809 return (0); 1810 } 1811 if (*tl != nfs_prog) { 1812 if (*tl == nqnfs_prog) 1813 nqnfs++; 1814 else { 1815 nd->nd_repstat = EPROGUNAVAIL; 1816 nd->nd_procnum = NFSPROC_NOOP; 1817 return (0); 1818 } 1819 } 1820 tl++; 1821 nfsvers = fxdr_unsigned(u_int32_t, *tl++); 1822 if (((nfsvers < NFS_VER2 || nfsvers > NFS_VER3) && !nqnfs) || 1823 (nfsvers != NQNFS_VER3 && nqnfs)) { 1824 nd->nd_repstat = EPROGMISMATCH; 1825 nd->nd_procnum = NFSPROC_NOOP; 1826 return (0); 1827 } 1828 if (nqnfs) 1829 nd->nd_flag = (ND_NFSV3 | ND_NQNFS); 1830 else if (nfsvers == NFS_VER3) 1831 nd->nd_flag = ND_NFSV3; 1832 nd->nd_procnum = fxdr_unsigned(u_int32_t, *tl++); 1833 if (nd->nd_procnum == NFSPROC_NULL) 1834 return (0); 1835 if (nd->nd_procnum >= NFS_NPROCS || 1836 (!nqnfs && nd->nd_procnum >= NQNFSPROC_GETLEASE) || 1837 (!nd->nd_flag && nd->nd_procnum > NFSV2PROC_STATFS)) { 1838 nd->nd_repstat = EPROCUNAVAIL; 1839 nd->nd_procnum = NFSPROC_NOOP; 1840 return (0); 1841 } 1842 if ((nd->nd_flag & ND_NFSV3) == 0) 1843 nd->nd_procnum = nfsv3_procid[nd->nd_procnum]; 1844 auth_type = *tl++; 1845 len = fxdr_unsigned(int, *tl++); 1846 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1847 m_freem(mrep); 1848 return (EBADRPC); 1849 } 1850 1851 nd->nd_flag &= ~ND_KERBAUTH; 1852 /* 1853 * Handle auth_unix or auth_kerb. 1854 */ 1855 if (auth_type == rpc_auth_unix) { 1856 len = fxdr_unsigned(int, *++tl); 1857 if (len < 0 || len > NFS_MAXNAMLEN) { 1858 m_freem(mrep); 1859 return (EBADRPC); 1860 } 1861 nfsm_adv(nfsm_rndup(len)); 1862 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1863 bzero((caddr_t)&nd->nd_cr, sizeof (struct ucred)); 1864 nd->nd_cr.cr_ref = 1; 1865 nd->nd_cr.cr_uid = fxdr_unsigned(uid_t, *tl++); 1866 nd->nd_cr.cr_gid = fxdr_unsigned(gid_t, *tl++); 1867 len = fxdr_unsigned(int, *tl); 1868 if (len < 0 || len > RPCAUTH_UNIXGIDS) { 1869 m_freem(mrep); 1870 return (EBADRPC); 1871 } 1872 nfsm_dissect(tl, u_int32_t *, (len + 2) * NFSX_UNSIGNED); 1873 for (i = 1; i <= len; i++) 1874 if (i < NGROUPS) 1875 nd->nd_cr.cr_groups[i] = fxdr_unsigned(gid_t, *tl++); 1876 else 1877 tl++; 1878 nd->nd_cr.cr_ngroups = (len >= NGROUPS) ? NGROUPS : (len + 1); 1879 if (nd->nd_cr.cr_ngroups > 1) 1880 nfsrvw_sort(nd->nd_cr.cr_groups, nd->nd_cr.cr_ngroups); 1881 len = fxdr_unsigned(int, *++tl); 1882 if (len < 0 || len > RPCAUTH_MAXSIZ) { 1883 m_freem(mrep); 1884 return (EBADRPC); 1885 } 1886 if (len > 0) 1887 nfsm_adv(nfsm_rndup(len)); 1888 } else if (auth_type == rpc_auth_kerb) { 1889 switch (fxdr_unsigned(int, *tl++)) { 1890 case RPCAKN_FULLNAME: 1891 ticklen = fxdr_unsigned(int, *tl); 1892 *((u_int32_t *)nfsd->nfsd_authstr) = *tl; 1893 uio.uio_resid = nfsm_rndup(ticklen) + NFSX_UNSIGNED; 1894 nfsd->nfsd_authlen = uio.uio_resid + NFSX_UNSIGNED; 1895 if (uio.uio_resid > (len - 2 * NFSX_UNSIGNED)) { 1896 m_freem(mrep); 1897 return (EBADRPC); 1898 } 1899 uio.uio_offset = 0; 1900 uio.uio_iov = &iov; 1901 uio.uio_iovcnt = 1; 1902 uio.uio_segflg = UIO_SYSSPACE; 1903 iov.iov_base = (caddr_t)&nfsd->nfsd_authstr[4]; 1904 iov.iov_len = RPCAUTH_MAXSIZ - 4; 1905 nfsm_mtouio(&uio, uio.uio_resid); 1906 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1907 if (*tl++ != rpc_auth_kerb || 1908 fxdr_unsigned(int, *tl) != 4 * NFSX_UNSIGNED) { 1909 printf("Bad kerb verifier\n"); 1910 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1911 nd->nd_procnum = NFSPROC_NOOP; 1912 return (0); 1913 } 1914 nfsm_dissect(cp, caddr_t, 4 * NFSX_UNSIGNED); 1915 tl = (u_int32_t *)cp; 1916 if (fxdr_unsigned(int, *tl) != RPCAKN_FULLNAME) { 1917 printf("Not fullname kerb verifier\n"); 1918 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1919 nd->nd_procnum = NFSPROC_NOOP; 1920 return (0); 1921 } 1922 cp += NFSX_UNSIGNED; 1923 bcopy(cp, nfsd->nfsd_verfstr, 3 * NFSX_UNSIGNED); 1924 nfsd->nfsd_verflen = 3 * NFSX_UNSIGNED; 1925 nd->nd_flag |= ND_KERBFULL; 1926 nfsd->nfsd_flag |= NFSD_NEEDAUTH; 1927 break; 1928 case RPCAKN_NICKNAME: 1929 if (len != 2 * NFSX_UNSIGNED) { 1930 printf("Kerb nickname short\n"); 1931 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADCRED); 1932 nd->nd_procnum = NFSPROC_NOOP; 1933 return (0); 1934 } 1935 nickuid = fxdr_unsigned(uid_t, *tl); 1936 nfsm_dissect(tl, u_int32_t *, 2 * NFSX_UNSIGNED); 1937 if (*tl++ != rpc_auth_kerb || 1938 fxdr_unsigned(int, *tl) != 3 * NFSX_UNSIGNED) { 1939 printf("Kerb nick verifier bad\n"); 1940 nd->nd_repstat = (NFSERR_AUTHERR|AUTH_BADVERF); 1941 nd->nd_procnum = NFSPROC_NOOP; 1942 return (0); 1943 } 1944 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1945 tvin.tv_sec = *tl++; 1946 tvin.tv_usec = *tl; 1947 1948 for (nuidp = NUIDHASH(nfsd->nfsd_slp,nickuid)->lh_first; 1949 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1950 if (nuidp->nu_cr.cr_uid == nickuid && 1951 (!nd->nd_nam2 || 1952 netaddr_match(NU_NETFAM(nuidp), 1953 &nuidp->nu_haddr, nd->nd_nam2))) 1954 break; 1955 } 1956 if (!nuidp) { 1957 nd->nd_repstat = 1958 (NFSERR_AUTHERR|AUTH_REJECTCRED); 1959 nd->nd_procnum = NFSPROC_NOOP; 1960 return (0); 1961 } 1962 1963 /* 1964 * Now, decrypt the timestamp using the session key 1965 * and validate it. 1966 */ 1967 #ifdef NFSKERB 1968 XXX 1969 #endif 1970 1971 tvout.tv_sec = fxdr_unsigned(long, tvout.tv_sec); 1972 tvout.tv_usec = fxdr_unsigned(long, tvout.tv_usec); 1973 if (nuidp->nu_expire < time_second || 1974 nuidp->nu_timestamp.tv_sec > tvout.tv_sec || 1975 (nuidp->nu_timestamp.tv_sec == tvout.tv_sec && 1976 nuidp->nu_timestamp.tv_usec > tvout.tv_usec)) { 1977 nuidp->nu_expire = 0; 1978 nd->nd_repstat = 1979 (NFSERR_AUTHERR|AUTH_REJECTVERF); 1980 nd->nd_procnum = NFSPROC_NOOP; 1981 return (0); 1982 } 1983 nfsrv_setcred(&nuidp->nu_cr, &nd->nd_cr); 1984 nd->nd_flag |= ND_KERBNICK; 1985 }; 1986 } else { 1987 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_REJECTCRED); 1988 nd->nd_procnum = NFSPROC_NOOP; 1989 return (0); 1990 } 1991 1992 /* 1993 * For nqnfs, get piggybacked lease request. 1994 */ 1995 if (nqnfs && nd->nd_procnum != NQNFSPROC_EVICTED) { 1996 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 1997 nd->nd_flag |= fxdr_unsigned(int, *tl); 1998 if (nd->nd_flag & ND_LEASE) { 1999 nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); 2000 nd->nd_duration = fxdr_unsigned(int32_t, *tl); 2001 } else 2002 nd->nd_duration = NQ_MINLEASE; 2003 } else 2004 nd->nd_duration = NQ_MINLEASE; 2005 nd->nd_md = md; 2006 nd->nd_dpos = dpos; 2007 return (0); 2008 nfsmout: 2009 return (error); 2010 } 2011 2012 #endif 2013 2014 static int 2015 nfs_msg(p, server, msg) 2016 struct proc *p; 2017 char *server, *msg; 2018 { 2019 tpr_t tpr; 2020 2021 if (p) 2022 tpr = tprintf_open(p); 2023 else 2024 tpr = NULL; 2025 tprintf(tpr, "nfs server %s: %s\n", server, msg); 2026 tprintf_close(tpr); 2027 return (0); 2028 } 2029 2030 #ifndef NFS_NOSERVER 2031 /* 2032 * Socket upcall routine for the nfsd sockets. 2033 * The caddr_t arg is a pointer to the "struct nfssvc_sock". 2034 * Essentially do as much as possible non-blocking, else punt and it will 2035 * be called with M_WAIT from an nfsd. 2036 */ 2037 void 2038 nfsrv_rcv(so, arg, waitflag) 2039 struct socket *so; 2040 void *arg; 2041 int waitflag; 2042 { 2043 register struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 2044 register struct mbuf *m; 2045 struct mbuf *mp; 2046 struct sockaddr *nam; 2047 struct uio auio; 2048 int flags, error; 2049 2050 if ((slp->ns_flag & SLP_VALID) == 0) 2051 return; 2052 #ifdef notdef 2053 /* 2054 * Define this to test for nfsds handling this under heavy load. 2055 */ 2056 if (waitflag == M_DONTWAIT) { 2057 slp->ns_flag |= SLP_NEEDQ; goto dorecs; 2058 } 2059 #endif 2060 auio.uio_procp = NULL; 2061 if (so->so_type == SOCK_STREAM) { 2062 /* 2063 * If there are already records on the queue, defer soreceive() 2064 * to an nfsd so that there is feedback to the TCP layer that 2065 * the nfs servers are heavily loaded. 2066 */ 2067 if (STAILQ_FIRST(&slp->ns_rec) && waitflag == M_DONTWAIT) { 2068 slp->ns_flag |= SLP_NEEDQ; 2069 goto dorecs; 2070 } 2071 2072 /* 2073 * Do soreceive(). 2074 */ 2075 auio.uio_resid = 1000000000; 2076 flags = MSG_DONTWAIT; 2077 error = so->so_proto->pr_usrreqs->pru_soreceive 2078 (so, &nam, &auio, &mp, (struct mbuf **)0, &flags); 2079 if (error || mp == (struct mbuf *)0) { 2080 if (error == EWOULDBLOCK) 2081 slp->ns_flag |= SLP_NEEDQ; 2082 else 2083 slp->ns_flag |= SLP_DISCONN; 2084 goto dorecs; 2085 } 2086 m = mp; 2087 if (slp->ns_rawend) { 2088 slp->ns_rawend->m_next = m; 2089 slp->ns_cc += 1000000000 - auio.uio_resid; 2090 } else { 2091 slp->ns_raw = m; 2092 slp->ns_cc = 1000000000 - auio.uio_resid; 2093 } 2094 while (m->m_next) 2095 m = m->m_next; 2096 slp->ns_rawend = m; 2097 2098 /* 2099 * Now try and parse record(s) out of the raw stream data. 2100 */ 2101 error = nfsrv_getstream(slp, waitflag); 2102 if (error) { 2103 if (error == EPERM) 2104 slp->ns_flag |= SLP_DISCONN; 2105 else 2106 slp->ns_flag |= SLP_NEEDQ; 2107 } 2108 } else { 2109 do { 2110 auio.uio_resid = 1000000000; 2111 flags = MSG_DONTWAIT; 2112 error = so->so_proto->pr_usrreqs->pru_soreceive 2113 (so, &nam, &auio, &mp, 2114 (struct mbuf **)0, &flags); 2115 if (mp) { 2116 struct nfsrv_rec *rec; 2117 rec = malloc(sizeof(struct nfsrv_rec), 2118 M_NFSRVDESC, waitflag); 2119 if (!rec) { 2120 if (nam) 2121 FREE(nam, M_SONAME); 2122 m_freem(mp); 2123 continue; 2124 } 2125 nfs_realign(&mp, 10 * NFSX_UNSIGNED); 2126 rec->nr_address = nam; 2127 rec->nr_packet = mp; 2128 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2129 } 2130 if (error) { 2131 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 2132 && error != EWOULDBLOCK) { 2133 slp->ns_flag |= SLP_DISCONN; 2134 goto dorecs; 2135 } 2136 } 2137 } while (mp); 2138 } 2139 2140 /* 2141 * Now try and process the request records, non-blocking. 2142 */ 2143 dorecs: 2144 if (waitflag == M_DONTWAIT && 2145 (STAILQ_FIRST(&slp->ns_rec) 2146 || (slp->ns_flag & (SLP_NEEDQ | SLP_DISCONN)))) 2147 nfsrv_wakenfsd(slp); 2148 } 2149 2150 /* 2151 * Try and extract an RPC request from the mbuf data list received on a 2152 * stream socket. The "waitflag" argument indicates whether or not it 2153 * can sleep. 2154 */ 2155 static int 2156 nfsrv_getstream(slp, waitflag) 2157 register struct nfssvc_sock *slp; 2158 int waitflag; 2159 { 2160 register struct mbuf *m, **mpp; 2161 register char *cp1, *cp2; 2162 register int len; 2163 struct mbuf *om, *m2, *recm; 2164 u_int32_t recmark; 2165 2166 if (slp->ns_flag & SLP_GETSTREAM) 2167 panic("nfs getstream"); 2168 slp->ns_flag |= SLP_GETSTREAM; 2169 for (;;) { 2170 if (slp->ns_reclen == 0) { 2171 if (slp->ns_cc < NFSX_UNSIGNED) { 2172 slp->ns_flag &= ~SLP_GETSTREAM; 2173 return (0); 2174 } 2175 m = slp->ns_raw; 2176 if (m->m_len >= NFSX_UNSIGNED) { 2177 bcopy(mtod(m, caddr_t), (caddr_t)&recmark, NFSX_UNSIGNED); 2178 m->m_data += NFSX_UNSIGNED; 2179 m->m_len -= NFSX_UNSIGNED; 2180 } else { 2181 cp1 = (caddr_t)&recmark; 2182 cp2 = mtod(m, caddr_t); 2183 while (cp1 < ((caddr_t)&recmark) + NFSX_UNSIGNED) { 2184 while (m->m_len == 0) { 2185 m = m->m_next; 2186 cp2 = mtod(m, caddr_t); 2187 } 2188 *cp1++ = *cp2++; 2189 m->m_data++; 2190 m->m_len--; 2191 } 2192 } 2193 slp->ns_cc -= NFSX_UNSIGNED; 2194 recmark = ntohl(recmark); 2195 slp->ns_reclen = recmark & ~0x80000000; 2196 if (recmark & 0x80000000) 2197 slp->ns_flag |= SLP_LASTFRAG; 2198 else 2199 slp->ns_flag &= ~SLP_LASTFRAG; 2200 if (slp->ns_reclen > NFS_MAXPACKET || slp->ns_reclen <= 0) { 2201 slp->ns_flag &= ~SLP_GETSTREAM; 2202 return (EPERM); 2203 } 2204 } 2205 2206 /* 2207 * Now get the record part. 2208 * 2209 * Note that slp->ns_reclen may be 0. Linux sometimes 2210 * generates 0-length RPCs 2211 */ 2212 recm = NULL; 2213 if (slp->ns_cc == slp->ns_reclen) { 2214 recm = slp->ns_raw; 2215 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 2216 slp->ns_cc = slp->ns_reclen = 0; 2217 } else if (slp->ns_cc > slp->ns_reclen) { 2218 len = 0; 2219 m = slp->ns_raw; 2220 om = (struct mbuf *)0; 2221 2222 while (len < slp->ns_reclen) { 2223 if ((len + m->m_len) > slp->ns_reclen) { 2224 m2 = m_copym(m, 0, slp->ns_reclen - len, 2225 waitflag); 2226 if (m2) { 2227 if (om) { 2228 om->m_next = m2; 2229 recm = slp->ns_raw; 2230 } else 2231 recm = m2; 2232 m->m_data += slp->ns_reclen - len; 2233 m->m_len -= slp->ns_reclen - len; 2234 len = slp->ns_reclen; 2235 } else { 2236 slp->ns_flag &= ~SLP_GETSTREAM; 2237 return (EWOULDBLOCK); 2238 } 2239 } else if ((len + m->m_len) == slp->ns_reclen) { 2240 om = m; 2241 len += m->m_len; 2242 m = m->m_next; 2243 recm = slp->ns_raw; 2244 om->m_next = (struct mbuf *)0; 2245 } else { 2246 om = m; 2247 len += m->m_len; 2248 m = m->m_next; 2249 } 2250 } 2251 slp->ns_raw = m; 2252 slp->ns_cc -= len; 2253 slp->ns_reclen = 0; 2254 } else { 2255 slp->ns_flag &= ~SLP_GETSTREAM; 2256 return (0); 2257 } 2258 2259 /* 2260 * Accumulate the fragments into a record. 2261 */ 2262 mpp = &slp->ns_frag; 2263 while (*mpp) 2264 mpp = &((*mpp)->m_next); 2265 *mpp = recm; 2266 if (slp->ns_flag & SLP_LASTFRAG) { 2267 struct nfsrv_rec *rec; 2268 rec = malloc(sizeof(struct nfsrv_rec), M_NFSRVDESC, waitflag); 2269 if (!rec) { 2270 m_freem(slp->ns_frag); 2271 } else { 2272 nfs_realign(&slp->ns_frag, 10 * NFSX_UNSIGNED); 2273 rec->nr_address = (struct sockaddr *)0; 2274 rec->nr_packet = slp->ns_frag; 2275 STAILQ_INSERT_TAIL(&slp->ns_rec, rec, nr_link); 2276 } 2277 slp->ns_frag = (struct mbuf *)0; 2278 } 2279 } 2280 } 2281 2282 /* 2283 * Parse an RPC header. 2284 */ 2285 int 2286 nfsrv_dorec(slp, nfsd, ndp) 2287 register struct nfssvc_sock *slp; 2288 struct nfsd *nfsd; 2289 struct nfsrv_descript **ndp; 2290 { 2291 struct nfsrv_rec *rec; 2292 register struct mbuf *m; 2293 struct sockaddr *nam; 2294 register struct nfsrv_descript *nd; 2295 int error; 2296 2297 *ndp = NULL; 2298 if ((slp->ns_flag & SLP_VALID) == 0 || !STAILQ_FIRST(&slp->ns_rec)) 2299 return (ENOBUFS); 2300 rec = STAILQ_FIRST(&slp->ns_rec); 2301 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 2302 nam = rec->nr_address; 2303 m = rec->nr_packet; 2304 free(rec, M_NFSRVDESC); 2305 MALLOC(nd, struct nfsrv_descript *, sizeof (struct nfsrv_descript), 2306 M_NFSRVDESC, M_WAITOK); 2307 nd->nd_md = nd->nd_mrep = m; 2308 nd->nd_nam2 = nam; 2309 nd->nd_dpos = mtod(m, caddr_t); 2310 error = nfs_getreq(nd, nfsd, TRUE); 2311 if (error) { 2312 if (nam) { 2313 FREE(nam, M_SONAME); 2314 } 2315 free((caddr_t)nd, M_NFSRVDESC); 2316 return (error); 2317 } 2318 *ndp = nd; 2319 nfsd->nfsd_nd = nd; 2320 return (0); 2321 } 2322 2323 /* 2324 * Search for a sleeping nfsd and wake it up. 2325 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 2326 * running nfsds will go look for the work in the nfssvc_sock list. 2327 */ 2328 void 2329 nfsrv_wakenfsd(slp) 2330 struct nfssvc_sock *slp; 2331 { 2332 register struct nfsd *nd; 2333 2334 if ((slp->ns_flag & SLP_VALID) == 0) 2335 return; 2336 for (nd = nfsd_head.tqh_first; nd != 0; nd = nd->nfsd_chain.tqe_next) { 2337 if (nd->nfsd_flag & NFSD_WAITING) { 2338 nd->nfsd_flag &= ~NFSD_WAITING; 2339 if (nd->nfsd_slp) 2340 panic("nfsd wakeup"); 2341 slp->ns_sref++; 2342 nd->nfsd_slp = slp; 2343 wakeup((caddr_t)nd); 2344 return; 2345 } 2346 } 2347 slp->ns_flag |= SLP_DOREC; 2348 nfsd_head_flag |= NFSD_CHECKSLP; 2349 } 2350 #endif /* NFS_NOSERVER */
Cache object: 4afb9c2f4de1f4e1da4250c83d02d1c1
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]