nfs_syscalls.c revision 1.148
1 /* $NetBSD: nfs_syscalls.c,v 1.148 2009/05/23 14:44:56 ad Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 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_syscalls.c 8.5 (Berkeley) 3/30/95 35 */ 36 37 #include <sys/cdefs.h> 38 __KERNEL_RCSID(0, "$NetBSD: nfs_syscalls.c,v 1.148 2009/05/23 14:44:56 ad Exp $"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/file.h> 44 #include <sys/stat.h> 45 #include <sys/vnode.h> 46 #include <sys/mount.h> 47 #include <sys/proc.h> 48 #include <sys/uio.h> 49 #include <sys/malloc.h> 50 #include <sys/kmem.h> 51 #include <sys/buf.h> 52 #include <sys/mbuf.h> 53 #include <sys/socket.h> 54 #include <sys/socketvar.h> 55 #include <sys/signalvar.h> 56 #include <sys/domain.h> 57 #include <sys/protosw.h> 58 #include <sys/namei.h> 59 #include <sys/syslog.h> 60 #include <sys/filedesc.h> 61 #include <sys/kthread.h> 62 #include <sys/kauth.h> 63 #include <sys/syscallargs.h> 64 65 #include <netinet/in.h> 66 #include <netinet/tcp.h> 67 #include <nfs/xdr_subs.h> 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfs/nfs.h> 71 #include <nfs/nfsm_subs.h> 72 #include <nfs/nfsrvcache.h> 73 #include <nfs/nfsmount.h> 74 #include <nfs/nfsnode.h> 75 #include <nfs/nfsrtt.h> 76 #include <nfs/nfs_var.h> 77 78 extern int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *, 79 struct nfssvc_sock *, 80 struct lwp *, struct mbuf **); 81 extern int nfsrvw_procrastinate; 82 extern int nuidhash_max; 83 84 static int nfs_numnfsd = 0; 85 static struct nfsdrt nfsdrt; 86 kmutex_t nfsd_lock; 87 struct nfssvc_sockhead nfssvc_sockhead; 88 kcondvar_t nfsd_initcv; 89 struct nfssvc_sockhead nfssvc_sockpending; 90 struct nfsdhead nfsd_head; 91 struct nfsdidlehead nfsd_idle_head; 92 93 int nfssvc_sockhead_flag; 94 int nfsd_head_flag; 95 96 struct nfssvc_sock *nfs_udpsock; 97 struct nfssvc_sock *nfs_udp6sock; 98 99 static struct nfssvc_sock *nfsrv_sockalloc(void); 100 static void nfsrv_sockfree(struct nfssvc_sock *); 101 static void nfsd_rt(int, struct nfsrv_descript *, int); 102 103 /* 104 * NFS server system calls 105 */ 106 107 108 /* 109 * Nfs server pseudo system call for the nfsd's 110 * Based on the flag value it either: 111 * - adds a socket to the selection list 112 * - remains in the kernel as an nfsd 113 * - remains in the kernel as an nfsiod 114 */ 115 int 116 sys_nfssvc(struct lwp *l, const struct sys_nfssvc_args *uap, register_t *retval) 117 { 118 /* { 119 syscallarg(int) flag; 120 syscallarg(void *) argp; 121 } */ 122 int error; 123 file_t *fp; 124 struct mbuf *nam; 125 struct nfsd_args nfsdarg; 126 struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs; 127 struct nfsd *nfsd; 128 struct nfssvc_sock *slp; 129 struct nfsuid *nuidp; 130 131 /* 132 * Must be super user 133 */ 134 error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_NFS, 135 KAUTH_REQ_NETWORK_NFS_SVC, NULL, NULL, NULL); 136 if (error) 137 return (error); 138 139 mutex_enter(&nfsd_lock); 140 while (nfssvc_sockhead_flag & SLP_INIT) { 141 cv_wait(&nfsd_initcv, &nfsd_lock); 142 } 143 mutex_exit(&nfsd_lock); 144 145 if (SCARG(uap, flag) & NFSSVC_BIOD) { 146 /* Dummy implementation of nfsios for 1.4 and earlier. */ 147 error = kpause("nfsbiod", true, 0, NULL); 148 } else if (SCARG(uap, flag) & NFSSVC_MNTD) { 149 error = ENOSYS; 150 } else if (SCARG(uap, flag) & NFSSVC_ADDSOCK) { 151 error = copyin(SCARG(uap, argp), (void *)&nfsdarg, 152 sizeof(nfsdarg)); 153 if (error) 154 return (error); 155 /* getsock() will use the descriptor for us */ 156 if ((fp = fd_getfile(nfsdarg.sock)) == NULL) 157 return (EBADF); 158 if (fp->f_type != DTYPE_SOCKET) { 159 fd_putfile(nfsdarg.sock); 160 return (ENOTSOCK); 161 } 162 /* 163 * Get the client address for connected sockets. 164 */ 165 if (nfsdarg.name == NULL || nfsdarg.namelen == 0) 166 nam = (struct mbuf *)0; 167 else { 168 error = sockargs(&nam, nfsdarg.name, nfsdarg.namelen, 169 MT_SONAME); 170 if (error) { 171 fd_putfile(nfsdarg.sock); 172 return (error); 173 } 174 } 175 error = nfssvc_addsock(fp, nam); 176 fd_putfile(nfsdarg.sock); 177 } else if (SCARG(uap, flag) & NFSSVC_SETEXPORTSLIST) { 178 struct export_args *args; 179 struct mountd_exports_list mel; 180 181 error = copyin(SCARG(uap, argp), &mel, sizeof(mel)); 182 if (error != 0) 183 return error; 184 185 args = (struct export_args *)malloc(mel.mel_nexports * 186 sizeof(struct export_args), M_TEMP, M_WAITOK); 187 error = copyin(mel.mel_exports, args, mel.mel_nexports * 188 sizeof(struct export_args)); 189 if (error != 0) { 190 free(args, M_TEMP); 191 return error; 192 } 193 mel.mel_exports = args; 194 195 error = mountd_set_exports_list(&mel, l); 196 197 free(args, M_TEMP); 198 } else { 199 error = copyin(SCARG(uap, argp), (void *)nsd, sizeof (*nsd)); 200 if (error) 201 return (error); 202 if ((SCARG(uap, flag) & NFSSVC_AUTHIN) && 203 ((nfsd = nsd->nsd_nfsd)) != NULL && 204 (nfsd->nfsd_slp->ns_flags & SLP_VALID)) { 205 slp = nfsd->nfsd_slp; 206 207 /* 208 * First check to see if another nfsd has already 209 * added this credential. 210 */ 211 LIST_FOREACH(nuidp, NUIDHASH(slp, nsd->nsd_cr.cr_uid), 212 nu_hash) { 213 if (kauth_cred_geteuid(nuidp->nu_cr) == 214 nsd->nsd_cr.cr_uid && 215 (!nfsd->nfsd_nd->nd_nam2 || 216 netaddr_match(NU_NETFAM(nuidp), 217 &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2))) 218 break; 219 } 220 if (nuidp) { 221 kauth_cred_hold(nuidp->nu_cr); 222 nfsd->nfsd_nd->nd_cr = nuidp->nu_cr; 223 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 224 } else { 225 /* 226 * Nope, so we will. 227 */ 228 if (slp->ns_numuids < nuidhash_max) { 229 slp->ns_numuids++; 230 nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP); 231 } else 232 nuidp = (struct nfsuid *)0; 233 if ((slp->ns_flags & SLP_VALID) == 0) { 234 if (nuidp) 235 kmem_free(nuidp, sizeof(*nuidp)); 236 } else { 237 if (nuidp == (struct nfsuid *)0) { 238 nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); 239 LIST_REMOVE(nuidp, nu_hash); 240 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, 241 nu_lru); 242 if (nuidp->nu_flag & NU_NAM) 243 m_freem(nuidp->nu_nam); 244 } 245 nuidp->nu_flag = 0; 246 kauth_uucred_to_cred(nuidp->nu_cr, 247 &nsd->nsd_cr); 248 nuidp->nu_timestamp = nsd->nsd_timestamp; 249 nuidp->nu_expire = time_second + nsd->nsd_ttl; 250 /* 251 * and save the session key in nu_key. 252 */ 253 memcpy(nuidp->nu_key, nsd->nsd_key, 254 sizeof(nsd->nsd_key)); 255 if (nfsd->nfsd_nd->nd_nam2) { 256 struct sockaddr_in *saddr; 257 258 saddr = mtod(nfsd->nfsd_nd->nd_nam2, 259 struct sockaddr_in *); 260 switch (saddr->sin_family) { 261 case AF_INET: 262 nuidp->nu_flag |= NU_INETADDR; 263 nuidp->nu_inetaddr = 264 saddr->sin_addr.s_addr; 265 break; 266 case AF_INET6: 267 nuidp->nu_flag |= NU_NAM; 268 nuidp->nu_nam = m_copym( 269 nfsd->nfsd_nd->nd_nam2, 0, 270 M_COPYALL, M_WAIT); 271 break; 272 default: 273 return EAFNOSUPPORT; 274 }; 275 } 276 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp, 277 nu_lru); 278 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid), 279 nuidp, nu_hash); 280 kauth_cred_hold(nuidp->nu_cr); 281 nfsd->nfsd_nd->nd_cr = nuidp->nu_cr; 282 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 283 } 284 } 285 } 286 if ((SCARG(uap, flag) & NFSSVC_AUTHINFAIL) && 287 (nfsd = nsd->nsd_nfsd)) 288 nfsd->nfsd_flag |= NFSD_AUTHFAIL; 289 error = nfssvc_nfsd(nsd, SCARG(uap, argp), l); 290 } 291 if (error == EINTR || error == ERESTART) 292 error = 0; 293 return (error); 294 } 295 296 static struct nfssvc_sock * 297 nfsrv_sockalloc(void) 298 { 299 struct nfssvc_sock *slp; 300 301 slp = kmem_alloc(sizeof(*slp), KM_SLEEP); 302 memset(slp, 0, sizeof (struct nfssvc_sock)); 303 mutex_init(&slp->ns_lock, MUTEX_DRIVER, IPL_SOFTNET); 304 mutex_init(&slp->ns_alock, MUTEX_DRIVER, IPL_SOFTNET); 305 cv_init(&slp->ns_cv, "nfsdsock"); 306 TAILQ_INIT(&slp->ns_uidlruhead); 307 LIST_INIT(&slp->ns_tq); 308 SIMPLEQ_INIT(&slp->ns_sendq); 309 mutex_enter(&nfsd_lock); 310 TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain); 311 mutex_exit(&nfsd_lock); 312 313 return slp; 314 } 315 316 static void 317 nfsrv_sockfree(struct nfssvc_sock *slp) 318 { 319 320 KASSERT(slp->ns_so == NULL); 321 KASSERT(slp->ns_fp == NULL); 322 KASSERT((slp->ns_flags & SLP_VALID) == 0); 323 mutex_destroy(&slp->ns_lock); 324 mutex_destroy(&slp->ns_alock); 325 cv_destroy(&slp->ns_cv); 326 kmem_free(slp, sizeof(*slp)); 327 } 328 329 /* 330 * Adds a socket to the list for servicing by nfsds. 331 */ 332 int 333 nfssvc_addsock(file_t *fp, struct mbuf *mynam) 334 { 335 int siz; 336 struct nfssvc_sock *slp; 337 struct socket *so; 338 struct nfssvc_sock *tslp; 339 int error; 340 int val; 341 342 so = (struct socket *)fp->f_data; 343 tslp = (struct nfssvc_sock *)0; 344 /* 345 * Add it to the list, as required. 346 */ 347 if (so->so_proto->pr_protocol == IPPROTO_UDP) { 348 if (so->so_proto->pr_domain->dom_family == AF_INET6) 349 tslp = nfs_udp6sock; 350 else { 351 tslp = nfs_udpsock; 352 if (tslp->ns_flags & SLP_VALID) { 353 m_freem(mynam); 354 return (EPERM); 355 } 356 } 357 } 358 if (so->so_type == SOCK_STREAM) 359 siz = NFS_MAXPACKET + sizeof (u_long); 360 else 361 siz = NFS_MAXPACKET; 362 solock(so); 363 error = soreserve(so, siz, siz); 364 sounlock(so); 365 if (error) { 366 m_freem(mynam); 367 return (error); 368 } 369 370 /* 371 * Set protocol specific options { for now TCP only } and 372 * reserve some space. For datagram sockets, this can get called 373 * repeatedly for the same socket, but that isn't harmful. 374 */ 375 if (so->so_type == SOCK_STREAM) { 376 val = 1; 377 so_setsockopt(NULL, so, SOL_SOCKET, SO_KEEPALIVE, &val, 378 sizeof(val)); 379 } 380 if ((so->so_proto->pr_domain->dom_family == AF_INET || 381 so->so_proto->pr_domain->dom_family == AF_INET6) && 382 so->so_proto->pr_protocol == IPPROTO_TCP) { 383 val = 1; 384 so_setsockopt(NULL, so, IPPROTO_TCP, TCP_NODELAY, &val, 385 sizeof(val)); 386 } 387 solock(so); 388 so->so_rcv.sb_flags &= ~SB_NOINTR; 389 so->so_rcv.sb_timeo = 0; 390 so->so_snd.sb_flags &= ~SB_NOINTR; 391 so->so_snd.sb_timeo = 0; 392 sounlock(so); 393 if (tslp) { 394 slp = tslp; 395 } else { 396 slp = nfsrv_sockalloc(); 397 } 398 slp->ns_so = so; 399 slp->ns_nam = mynam; 400 mutex_enter(&fp->f_lock); 401 fp->f_count++; 402 mutex_exit(&fp->f_lock); 403 slp->ns_fp = fp; 404 slp->ns_flags = SLP_VALID; 405 slp->ns_aflags = SLP_A_NEEDQ; 406 slp->ns_gflags = 0; 407 slp->ns_sflags = 0; 408 solock(so); 409 so->so_upcallarg = (void *)slp; 410 so->so_upcall = nfsrv_soupcall; 411 so->so_rcv.sb_flags |= SB_UPCALL; 412 sounlock(so); 413 nfsrv_wakenfsd(slp); 414 return (0); 415 } 416 417 /* 418 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 419 * until it is killed by a signal. 420 */ 421 int 422 nfssvc_nfsd(struct nfsd_srvargs *nsd, void *argp, struct lwp *l) 423 { 424 struct timeval tv; 425 struct mbuf *m; 426 struct nfssvc_sock *slp; 427 struct nfsd *nfsd = nsd->nsd_nfsd; 428 struct nfsrv_descript *nd = NULL; 429 struct mbuf *mreq; 430 u_quad_t cur_usec; 431 int error = 0, cacherep, siz, sotype, writes_todo; 432 struct proc *p = l->l_proc; 433 bool doreinit; 434 435 #ifndef nolint 436 cacherep = RC_DOIT; 437 writes_todo = 0; 438 #endif 439 uvm_lwp_hold(l); 440 if (nfsd == NULL) { 441 nsd->nsd_nfsd = nfsd = kmem_alloc(sizeof(*nfsd), KM_SLEEP); 442 memset(nfsd, 0, sizeof (struct nfsd)); 443 cv_init(&nfsd->nfsd_cv, "nfsd"); 444 nfsd->nfsd_procp = p; 445 mutex_enter(&nfsd_lock); 446 while ((nfssvc_sockhead_flag & SLP_INIT) != 0) { 447 KASSERT(nfs_numnfsd == 0); 448 cv_wait(&nfsd_initcv, &nfsd_lock); 449 } 450 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); 451 nfs_numnfsd++; 452 mutex_exit(&nfsd_lock); 453 } 454 /* 455 * Loop getting rpc requests until SIGKILL. 456 */ 457 for (;;) { 458 bool dummy; 459 460 if ((curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD) 461 != 0) { 462 preempt(); 463 } 464 if (nfsd->nfsd_slp == NULL) { 465 mutex_enter(&nfsd_lock); 466 while (nfsd->nfsd_slp == NULL && 467 (nfsd_head_flag & NFSD_CHECKSLP) == 0) { 468 SLIST_INSERT_HEAD(&nfsd_idle_head, nfsd, 469 nfsd_idle); 470 error = cv_wait_sig(&nfsd->nfsd_cv, &nfsd_lock); 471 if (error) { 472 slp = nfsd->nfsd_slp; 473 nfsd->nfsd_slp = NULL; 474 if (!slp) 475 SLIST_REMOVE(&nfsd_idle_head, 476 nfsd, nfsd, nfsd_idle); 477 mutex_exit(&nfsd_lock); 478 if (slp) { 479 nfsrv_wakenfsd(slp); 480 nfsrv_slpderef(slp); 481 } 482 goto done; 483 } 484 } 485 if (nfsd->nfsd_slp == NULL && 486 (nfsd_head_flag & NFSD_CHECKSLP) != 0) { 487 slp = TAILQ_FIRST(&nfssvc_sockpending); 488 if (slp) { 489 KASSERT((slp->ns_gflags & SLP_G_DOREC) 490 != 0); 491 TAILQ_REMOVE(&nfssvc_sockpending, slp, 492 ns_pending); 493 slp->ns_gflags &= ~SLP_G_DOREC; 494 slp->ns_sref++; 495 nfsd->nfsd_slp = slp; 496 } else 497 nfsd_head_flag &= ~NFSD_CHECKSLP; 498 } 499 KASSERT(nfsd->nfsd_slp == NULL || 500 nfsd->nfsd_slp->ns_sref > 0); 501 mutex_exit(&nfsd_lock); 502 if ((slp = nfsd->nfsd_slp) == NULL) 503 continue; 504 if (slp->ns_flags & SLP_VALID) { 505 bool more; 506 507 if (nfsdsock_testbits(slp, SLP_A_NEEDQ)) { 508 nfsrv_rcv(slp); 509 } 510 if (nfsdsock_testbits(slp, SLP_A_DISCONN)) { 511 nfsrv_zapsock(slp); 512 } 513 error = nfsrv_dorec(slp, nfsd, &nd, &more); 514 getmicrotime(&tv); 515 cur_usec = (u_quad_t)tv.tv_sec * 1000000 + 516 (u_quad_t)tv.tv_usec; 517 writes_todo = 0; 518 if (error) { 519 struct nfsrv_descript *nd2; 520 521 mutex_enter(&nfsd_lock); 522 nd2 = LIST_FIRST(&slp->ns_tq); 523 if (nd2 != NULL && 524 nd2->nd_time <= cur_usec) { 525 error = 0; 526 cacherep = RC_DOIT; 527 writes_todo = 1; 528 } 529 mutex_exit(&nfsd_lock); 530 } 531 if (error == 0 && more) { 532 nfsrv_wakenfsd(slp); 533 } 534 } 535 } else { 536 error = 0; 537 slp = nfsd->nfsd_slp; 538 } 539 KASSERT(slp != NULL); 540 KASSERT(nfsd->nfsd_slp == slp); 541 if (error || (slp->ns_flags & SLP_VALID) == 0) { 542 if (nd) { 543 nfsdreq_free(nd); 544 nd = NULL; 545 } 546 nfsd->nfsd_slp = NULL; 547 nfsrv_slpderef(slp); 548 continue; 549 } 550 sotype = slp->ns_so->so_type; 551 if (nd) { 552 getmicrotime(&nd->nd_starttime); 553 if (nd->nd_nam2) 554 nd->nd_nam = nd->nd_nam2; 555 else 556 nd->nd_nam = slp->ns_nam; 557 558 /* 559 * Check to see if authorization is needed. 560 */ 561 if (nfsd->nfsd_flag & NFSD_NEEDAUTH) { 562 nfsd->nfsd_flag &= ~NFSD_NEEDAUTH; 563 nsd->nsd_haddr = mtod(nd->nd_nam, 564 struct sockaddr_in *)->sin_addr.s_addr; 565 nsd->nsd_authlen = nfsd->nfsd_authlen; 566 nsd->nsd_verflen = nfsd->nfsd_verflen; 567 if (!copyout(nfsd->nfsd_authstr, 568 nsd->nsd_authstr, nfsd->nfsd_authlen) && 569 !copyout(nfsd->nfsd_verfstr, 570 nsd->nsd_verfstr, nfsd->nfsd_verflen) && 571 !copyout(nsd, argp, sizeof (*nsd))) { 572 uvm_lwp_rele(l); 573 return (ENEEDAUTH); 574 } 575 cacherep = RC_DROPIT; 576 } else 577 cacherep = nfsrv_getcache(nd, slp, &mreq); 578 579 if (nfsd->nfsd_flag & NFSD_AUTHFAIL) { 580 nfsd->nfsd_flag &= ~NFSD_AUTHFAIL; 581 nd->nd_procnum = NFSPROC_NOOP; 582 nd->nd_repstat = 583 (NFSERR_AUTHERR | AUTH_TOOWEAK); 584 cacherep = RC_DOIT; 585 } 586 } 587 588 /* 589 * Loop to get all the write rpc relies that have been 590 * gathered together. 591 */ 592 do { 593 switch (cacherep) { 594 case RC_DOIT: 595 mreq = NULL; 596 netexport_rdlock(); 597 if (writes_todo || nd == NULL || 598 (!(nd->nd_flag & ND_NFSV3) && 599 nd->nd_procnum == NFSPROC_WRITE && 600 nfsrvw_procrastinate > 0)) 601 error = nfsrv_writegather(&nd, slp, 602 l, &mreq); 603 else 604 error = 605 (*(nfsrv3_procs[nd->nd_procnum])) 606 (nd, slp, l, &mreq); 607 netexport_rdunlock(); 608 if (mreq == NULL) { 609 if (nd != NULL) { 610 if (nd->nd_nam2) 611 m_free(nd->nd_nam2); 612 } 613 break; 614 } 615 if (error) { 616 nfsstats.srv_errs++; 617 nfsrv_updatecache(nd, false, mreq); 618 if (nd->nd_nam2) 619 m_freem(nd->nd_nam2); 620 break; 621 } 622 nfsstats.srvrpccnt[nd->nd_procnum]++; 623 nfsrv_updatecache(nd, true, mreq); 624 nd->nd_mrep = (struct mbuf *)0; 625 case RC_REPLY: 626 m = mreq; 627 siz = 0; 628 while (m) { 629 siz += m->m_len; 630 m = m->m_next; 631 } 632 if (siz <= 0 || siz > NFS_MAXPACKET) { 633 printf("mbuf siz=%d\n",siz); 634 panic("Bad nfs svc reply"); 635 } 636 m = mreq; 637 m->m_pkthdr.len = siz; 638 m->m_pkthdr.rcvif = (struct ifnet *)0; 639 /* 640 * For stream protocols, prepend a Sun RPC 641 * Record Mark. 642 */ 643 if (sotype == SOCK_STREAM) { 644 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 645 *mtod(m, u_int32_t *) = 646 htonl(0x80000000 | siz); 647 } 648 nd->nd_mreq = m; 649 if (nfsrtton) { 650 nfsd_rt(slp->ns_so->so_type, nd, 651 cacherep); 652 } 653 error = nfsdsock_sendreply(slp, nd); 654 nd = NULL; 655 if (error == EPIPE) 656 nfsrv_zapsock(slp); 657 if (error == EINTR || error == ERESTART) { 658 nfsd->nfsd_slp = NULL; 659 nfsrv_slpderef(slp); 660 goto done; 661 } 662 break; 663 case RC_DROPIT: 664 if (nfsrtton) 665 nfsd_rt(sotype, nd, cacherep); 666 m_freem(nd->nd_mrep); 667 m_freem(nd->nd_nam2); 668 break; 669 } 670 if (nd) { 671 nfsdreq_free(nd); 672 nd = NULL; 673 } 674 675 /* 676 * Check to see if there are outstanding writes that 677 * need to be serviced. 678 */ 679 getmicrotime(&tv); 680 cur_usec = (u_quad_t)tv.tv_sec * 1000000 + 681 (u_quad_t)tv.tv_usec; 682 mutex_enter(&nfsd_lock); 683 if (LIST_FIRST(&slp->ns_tq) && 684 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { 685 cacherep = RC_DOIT; 686 writes_todo = 1; 687 } else 688 writes_todo = 0; 689 mutex_exit(&nfsd_lock); 690 } while (writes_todo); 691 if (nfsrv_dorec(slp, nfsd, &nd, &dummy)) { 692 nfsd->nfsd_slp = NULL; 693 nfsrv_slpderef(slp); 694 } 695 } 696 done: 697 mutex_enter(&nfsd_lock); 698 TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); 699 doreinit = --nfs_numnfsd == 0; 700 if (doreinit) 701 nfssvc_sockhead_flag |= SLP_INIT; 702 mutex_exit(&nfsd_lock); 703 cv_destroy(&nfsd->nfsd_cv); 704 kmem_free(nfsd, sizeof(*nfsd)); 705 nsd->nsd_nfsd = NULL; 706 if (doreinit) 707 nfsrv_init(true); /* Reinitialize everything */ 708 uvm_lwp_rele(l); 709 return (error); 710 } 711 712 /* 713 * Shut down a socket associated with an nfssvc_sock structure. 714 * Should be called with the send lock set, if required. 715 * The trick here is to increment the sref at the start, so that the nfsds 716 * will stop using it and clear ns_flag at the end so that it will not be 717 * reassigned during cleanup. 718 * 719 * called at splsoftnet. 720 */ 721 void 722 nfsrv_zapsock(struct nfssvc_sock *slp) 723 { 724 struct nfsuid *nuidp, *nnuidp; 725 struct nfsrv_descript *nwp; 726 struct socket *so; 727 struct mbuf *m; 728 729 if (nfsdsock_drain(slp)) { 730 return; 731 } 732 mutex_enter(&nfsd_lock); 733 if (slp->ns_gflags & SLP_G_DOREC) { 734 TAILQ_REMOVE(&nfssvc_sockpending, slp, ns_pending); 735 slp->ns_gflags &= ~SLP_G_DOREC; 736 } 737 mutex_exit(&nfsd_lock); 738 739 so = slp->ns_so; 740 KASSERT(so != NULL); 741 solock(so); 742 so->so_upcall = NULL; 743 so->so_upcallarg = NULL; 744 so->so_rcv.sb_flags &= ~SB_UPCALL; 745 soshutdown(so, SHUT_RDWR); 746 sounlock(so); 747 748 m_freem(slp->ns_raw); 749 m = slp->ns_rec; 750 while (m != NULL) { 751 struct mbuf *n; 752 753 n = m->m_nextpkt; 754 m_freem(m); 755 m = n; 756 } 757 /* XXX what about freeing ns_frag ? */ 758 for (nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); nuidp != 0; 759 nuidp = nnuidp) { 760 nnuidp = TAILQ_NEXT(nuidp, nu_lru); 761 LIST_REMOVE(nuidp, nu_hash); 762 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru); 763 if (nuidp->nu_flag & NU_NAM) 764 m_freem(nuidp->nu_nam); 765 kmem_free(nuidp, sizeof(*nuidp)); 766 } 767 mutex_enter(&nfsd_lock); 768 while ((nwp = LIST_FIRST(&slp->ns_tq)) != NULL) { 769 LIST_REMOVE(nwp, nd_tq); 770 mutex_exit(&nfsd_lock); 771 nfsdreq_free(nwp); 772 mutex_enter(&nfsd_lock); 773 } 774 mutex_exit(&nfsd_lock); 775 } 776 777 /* 778 * Derefence a server socket structure. If it has no more references and 779 * is no longer valid, you can throw it away. 780 */ 781 void 782 nfsrv_slpderef(struct nfssvc_sock *slp) 783 { 784 uint32_t ref; 785 786 mutex_enter(&nfsd_lock); 787 KASSERT(slp->ns_sref > 0); 788 ref = --slp->ns_sref; 789 if (ref == 0 && (slp->ns_flags & SLP_VALID) == 0) { 790 file_t *fp; 791 792 KASSERT((slp->ns_gflags & SLP_G_DOREC) == 0); 793 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 794 mutex_exit(&nfsd_lock); 795 796 fp = slp->ns_fp; 797 if (fp != NULL) { 798 slp->ns_fp = NULL; 799 KASSERT(fp != NULL); 800 KASSERT(fp->f_data == slp->ns_so); 801 KASSERT(fp->f_count > 0); 802 closef(fp); 803 slp->ns_so = NULL; 804 } 805 806 if (slp->ns_nam) 807 m_free(slp->ns_nam); 808 nfsrv_sockfree(slp); 809 } else 810 mutex_exit(&nfsd_lock); 811 } 812 813 /* 814 * Initialize the data structures for the server. 815 * Handshake with any new nfsds starting up to avoid any chance of 816 * corruption. 817 */ 818 void 819 nfsrv_init(int terminating) 820 { 821 struct nfssvc_sock *slp; 822 823 if (!terminating) { 824 mutex_init(&nfsd_lock, MUTEX_DRIVER, IPL_SOFTNET); 825 cv_init(&nfsd_initcv, "nfsdinit"); 826 } 827 828 mutex_enter(&nfsd_lock); 829 if (!terminating && (nfssvc_sockhead_flag & SLP_INIT) != 0) 830 panic("nfsd init"); 831 nfssvc_sockhead_flag |= SLP_INIT; 832 833 if (terminating) { 834 KASSERT(SLIST_EMPTY(&nfsd_idle_head)); 835 KASSERT(TAILQ_EMPTY(&nfsd_head)); 836 while ((slp = TAILQ_FIRST(&nfssvc_sockhead)) != NULL) { 837 mutex_exit(&nfsd_lock); 838 KASSERT(slp->ns_sref == 0); 839 slp->ns_sref++; 840 nfsrv_zapsock(slp); 841 nfsrv_slpderef(slp); 842 mutex_enter(&nfsd_lock); 843 } 844 KASSERT(TAILQ_EMPTY(&nfssvc_sockpending)); 845 mutex_exit(&nfsd_lock); 846 nfsrv_cleancache(); /* And clear out server cache */ 847 } else { 848 mutex_exit(&nfsd_lock); 849 nfs_pub.np_valid = 0; 850 } 851 852 TAILQ_INIT(&nfssvc_sockhead); 853 TAILQ_INIT(&nfssvc_sockpending); 854 855 TAILQ_INIT(&nfsd_head); 856 SLIST_INIT(&nfsd_idle_head); 857 nfsd_head_flag &= ~NFSD_CHECKSLP; 858 859 nfs_udpsock = nfsrv_sockalloc(); 860 nfs_udp6sock = nfsrv_sockalloc(); 861 862 mutex_enter(&nfsd_lock); 863 nfssvc_sockhead_flag &= ~SLP_INIT; 864 cv_broadcast(&nfsd_initcv); 865 mutex_exit(&nfsd_lock); 866 } 867 868 void 869 nfsrv_fini(void) 870 { 871 872 nfsrv_init(true); 873 cv_destroy(&nfsd_initcv); 874 mutex_destroy(&nfsd_lock); 875 } 876 877 /* 878 * Add entries to the server monitor log. 879 */ 880 static void 881 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep) 882 { 883 struct timeval tv; 884 struct drt *rt; 885 886 rt = &nfsdrt.drt[nfsdrt.pos]; 887 if (cacherep == RC_DOIT) 888 rt->flag = 0; 889 else if (cacherep == RC_REPLY) 890 rt->flag = DRT_CACHEREPLY; 891 else 892 rt->flag = DRT_CACHEDROP; 893 if (sotype == SOCK_STREAM) 894 rt->flag |= DRT_TCP; 895 if (nd->nd_flag & ND_NFSV3) 896 rt->flag |= DRT_NFSV3; 897 rt->proc = nd->nd_procnum; 898 if (mtod(nd->nd_nam, struct sockaddr *)->sa_family == AF_INET) 899 rt->ipadr = mtod(nd->nd_nam, struct sockaddr_in *)->sin_addr.s_addr; 900 else 901 rt->ipadr = INADDR_ANY; 902 getmicrotime(&tv); 903 rt->resptime = ((tv.tv_sec - nd->nd_starttime.tv_sec) * 1000000) + 904 (tv.tv_usec - nd->nd_starttime.tv_usec); 905 rt->tstamp = tv; 906 nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ; 907 } 908
Indexes created Tue Oct 21 15:09:54 GMT 2025