1 /* $NetBSD: nfs_syscalls.c,v 1.147 2009/04/10 19:04:14 bouyer 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 1.147 2009/04/10 19:04:14 bouyer 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 if (error) 163 return (error); 164 /* 165 * Get the client address for connected sockets. 166 */ 167 if (nfsdarg.name == NULL || nfsdarg.namelen == 0) 168 nam = (struct mbuf *)0; 169 else { 170 error = sockargs(&nam, nfsdarg.name, nfsdarg.namelen, 171 MT_SONAME); 172 if (error) { 173 fd_putfile(nfsdarg.sock); 174 return (error); 175 } 176 } 177 error = nfssvc_addsock(fp, nam); 178 fd_putfile(nfsdarg.sock); 179 } else if (SCARG(uap, flag) & NFSSVC_SETEXPORTSLIST) { 180 struct export_args *args; 181 struct mountd_exports_list mel; 182 183 error = copyin(SCARG(uap, argp), &mel, sizeof(mel)); 184 if (error != 0) 185 return error; 186 187 args = (struct export_args *)malloc(mel.mel_nexports * 188 sizeof(struct export_args), M_TEMP, M_WAITOK); 189 error = copyin(mel.mel_exports, args, mel.mel_nexports * 190 sizeof(struct export_args)); 191 if (error != 0) { 192 free(args, M_TEMP); 193 return error; 194 } 195 mel.mel_exports = args; 196 197 error = mountd_set_exports_list(&mel, l); 198 199 free(args, M_TEMP); 200 } else { 201 error = copyin(SCARG(uap, argp), (void *)nsd, sizeof (*nsd)); 202 if (error) 203 return (error); 204 if ((SCARG(uap, flag) & NFSSVC_AUTHIN) && 205 ((nfsd = nsd->nsd_nfsd)) != NULL && 206 (nfsd->nfsd_slp->ns_flags & SLP_VALID)) { 207 slp = nfsd->nfsd_slp; 208 209 /* 210 * First check to see if another nfsd has already 211 * added this credential. 212 */ 213 LIST_FOREACH(nuidp, NUIDHASH(slp, nsd->nsd_cr.cr_uid), 214 nu_hash) { 215 if (kauth_cred_geteuid(nuidp->nu_cr) == 216 nsd->nsd_cr.cr_uid && 217 (!nfsd->nfsd_nd->nd_nam2 || 218 netaddr_match(NU_NETFAM(nuidp), 219 &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2))) 220 break; 221 } 222 if (nuidp) { 223 kauth_cred_hold(nuidp->nu_cr); 224 nfsd->nfsd_nd->nd_cr = nuidp->nu_cr; 225 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 226 } else { 227 /* 228 * Nope, so we will. 229 */ 230 if (slp->ns_numuids < nuidhash_max) { 231 slp->ns_numuids++; 232 nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP); 233 } else 234 nuidp = (struct nfsuid *)0; 235 if ((slp->ns_flags & SLP_VALID) == 0) { 236 if (nuidp) 237 kmem_free(nuidp, sizeof(*nuidp)); 238 } else { 239 if (nuidp == (struct nfsuid *)0) { 240 nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); 241 LIST_REMOVE(nuidp, nu_hash); 242 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, 243 nu_lru); 244 if (nuidp->nu_flag & NU_NAM) 245 m_freem(nuidp->nu_nam); 246 } 247 nuidp->nu_flag = 0; 248 kauth_uucred_to_cred(nuidp->nu_cr, 249 &nsd->nsd_cr); 250 nuidp->nu_timestamp = nsd->nsd_timestamp; 251 nuidp->nu_expire = time_second + nsd->nsd_ttl; 252 /* 253 * and save the session key in nu_key. 254 */ 255 memcpy(nuidp->nu_key, nsd->nsd_key, 256 sizeof(nsd->nsd_key)); 257 if (nfsd->nfsd_nd->nd_nam2) { 258 struct sockaddr_in *saddr; 259 260 saddr = mtod(nfsd->nfsd_nd->nd_nam2, 261 struct sockaddr_in *); 262 switch (saddr->sin_family) { 263 case AF_INET: 264 nuidp->nu_flag |= NU_INETADDR; 265 nuidp->nu_inetaddr = 266 saddr->sin_addr.s_addr; 267 break; 268 case AF_INET6: 269 nuidp->nu_flag |= NU_NAM; 270 nuidp->nu_nam = m_copym( 271 nfsd->nfsd_nd->nd_nam2, 0, 272 M_COPYALL, M_WAIT); 273 break; 274 default: 275 return EAFNOSUPPORT; 276 }; 277 } 278 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp, 279 nu_lru); 280 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid), 281 nuidp, nu_hash); 282 kauth_cred_hold(nuidp->nu_cr); 283 nfsd->nfsd_nd->nd_cr = nuidp->nu_cr; 284 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 285 } 286 } 287 } 288 if ((SCARG(uap, flag) & NFSSVC_AUTHINFAIL) && 289 (nfsd = nsd->nsd_nfsd)) 290 nfsd->nfsd_flag |= NFSD_AUTHFAIL; 291 error = nfssvc_nfsd(nsd, SCARG(uap, argp), l); 292 } 293 if (error == EINTR || error == ERESTART) 294 error = 0; 295 return (error); 296 } 297 298 static struct nfssvc_sock * 299 nfsrv_sockalloc(void) 300 { 301 struct nfssvc_sock *slp; 302 303 slp = kmem_alloc(sizeof(*slp), KM_SLEEP); 304 memset(slp, 0, sizeof (struct nfssvc_sock)); 305 mutex_init(&slp->ns_lock, MUTEX_DRIVER, IPL_SOFTNET); 306 mutex_init(&slp->ns_alock, MUTEX_DRIVER, IPL_SOFTNET); 307 cv_init(&slp->ns_cv, "nfsdsock"); 308 TAILQ_INIT(&slp->ns_uidlruhead); 309 LIST_INIT(&slp->ns_tq); 310 SIMPLEQ_INIT(&slp->ns_sendq); 311 mutex_enter(&nfsd_lock); 312 TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain); 313 mutex_exit(&nfsd_lock); 314 315 return slp; 316 } 317 318 static void 319 nfsrv_sockfree(struct nfssvc_sock *slp) 320 { 321 322 KASSERT(slp->ns_so == NULL); 323 KASSERT(slp->ns_fp == NULL); 324 KASSERT((slp->ns_flags & SLP_VALID) == 0); 325 mutex_destroy(&slp->ns_lock); 326 mutex_destroy(&slp->ns_alock); 327 cv_destroy(&slp->ns_cv); 328 kmem_free(slp, sizeof(*slp)); 329 } 330 331 /* 332 * Adds a socket to the list for servicing by nfsds. 333 */ 334 int 335 nfssvc_addsock(file_t *fp, struct mbuf *mynam) 336 { 337 int siz; 338 struct nfssvc_sock *slp; 339 struct socket *so; 340 struct nfssvc_sock *tslp; 341 int error; 342 int val; 343 344 so = (struct socket *)fp->f_data; 345 tslp = (struct nfssvc_sock *)0; 346 /* 347 * Add it to the list, as required. 348 */ 349 if (so->so_proto->pr_protocol == IPPROTO_UDP) { 350 if (so->so_proto->pr_domain->dom_family == AF_INET6) 351 tslp = nfs_udp6sock; 352 else { 353 tslp = nfs_udpsock; 354 if (tslp->ns_flags & SLP_VALID) { 355 m_freem(mynam); 356 return (EPERM); 357 } 358 } 359 } 360 if (so->so_type == SOCK_STREAM) 361 siz = NFS_MAXPACKET + sizeof (u_long); 362 else 363 siz = NFS_MAXPACKET; 364 solock(so); 365 error = soreserve(so, siz, siz); 366 sounlock(so); 367 if (error) { 368 m_freem(mynam); 369 return (error); 370 } 371 372 /* 373 * Set protocol specific options { for now TCP only } and 374 * reserve some space. For datagram sockets, this can get called 375 * repeatedly for the same socket, but that isn't harmful. 376 */ 377 if (so->so_type == SOCK_STREAM) { 378 val = 1; 379 so_setsockopt(NULL, so, SOL_SOCKET, SO_KEEPALIVE, &val, 380 sizeof(val)); 381 } 382 if ((so->so_proto->pr_domain->dom_family == AF_INET || 383 so->so_proto->pr_domain->dom_family == AF_INET6) && 384 so->so_proto->pr_protocol == IPPROTO_TCP) { 385 val = 1; 386 so_setsockopt(NULL, so, IPPROTO_TCP, TCP_NODELAY, &val, 387 sizeof(val)); 388 } 389 solock(so); 390 so->so_rcv.sb_flags &= ~SB_NOINTR; 391 so->so_rcv.sb_timeo = 0; 392 so->so_snd.sb_flags &= ~SB_NOINTR; 393 so->so_snd.sb_timeo = 0; 394 sounlock(so); 395 if (tslp) { 396 slp = tslp; 397 } else { 398 slp = nfsrv_sockalloc(); 399 } 400 slp->ns_so = so; 401 slp->ns_nam = mynam; 402 mutex_enter(&fp->f_lock); 403 fp->f_count++; 404 mutex_exit(&fp->f_lock); 405 slp->ns_fp = fp; 406 slp->ns_flags = SLP_VALID; 407 slp->ns_aflags = SLP_A_NEEDQ; 408 slp->ns_gflags = 0; 409 slp->ns_sflags = 0; 410 solock(so); 411 so->so_upcallarg = (void *)slp; 412 so->so_upcall = nfsrv_soupcall; 413 so->so_rcv.sb_flags |= SB_UPCALL; 414 sounlock(so); 415 nfsrv_wakenfsd(slp); 416 return (0); 417 } 418 419 /* 420 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 421 * until it is killed by a signal. 422 */ 423 int 424 nfssvc_nfsd(struct nfsd_srvargs *nsd, void *argp, struct lwp *l) 425 { 426 struct timeval tv; 427 struct mbuf *m; 428 struct nfssvc_sock *slp; 429 struct nfsd *nfsd = nsd->nsd_nfsd; 430 struct nfsrv_descript *nd = NULL; 431 struct mbuf *mreq; 432 u_quad_t cur_usec; 433 int error = 0, cacherep, siz, sotype, writes_todo; 434 struct proc *p = l->l_proc; 435 bool doreinit; 436 437 #ifndef nolint 438 cacherep = RC_DOIT; 439 writes_todo = 0; 440 #endif 441 uvm_lwp_hold(l); 442 if (nfsd == NULL) { 443 nsd->nsd_nfsd = nfsd = kmem_alloc(sizeof(*nfsd), KM_SLEEP); 444 memset(nfsd, 0, sizeof (struct nfsd)); 445 cv_init(&nfsd->nfsd_cv, "nfsd"); 446 nfsd->nfsd_procp = p; 447 mutex_enter(&nfsd_lock); 448 while ((nfssvc_sockhead_flag & SLP_INIT) != 0) { 449 KASSERT(nfs_numnfsd == 0); 450 cv_wait(&nfsd_initcv, &nfsd_lock); 451 } 452 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); 453 nfs_numnfsd++; 454 mutex_exit(&nfsd_lock); 455 } 456 /* 457 * Loop getting rpc requests until SIGKILL. 458 */ 459 for (;;) { 460 bool dummy; 461 462 if ((curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD) 463 != 0) { 464 preempt(); 465 } 466 if (nfsd->nfsd_slp == NULL) { 467 mutex_enter(&nfsd_lock); 468 while (nfsd->nfsd_slp == NULL && 469 (nfsd_head_flag & NFSD_CHECKSLP) == 0) { 470 SLIST_INSERT_HEAD(&nfsd_idle_head, nfsd, 471 nfsd_idle); 472 error = cv_wait_sig(&nfsd->nfsd_cv, &nfsd_lock); 473 if (error) { 474 slp = nfsd->nfsd_slp; 475 nfsd->nfsd_slp = NULL; 476 if (!slp) 477 SLIST_REMOVE(&nfsd_idle_head, 478 nfsd, nfsd, nfsd_idle); 479 mutex_exit(&nfsd_lock); 480 if (slp) { 481 nfsrv_wakenfsd(slp); 482 nfsrv_slpderef(slp); 483 } 484 goto done; 485 } 486 } 487 if (nfsd->nfsd_slp == NULL && 488 (nfsd_head_flag & NFSD_CHECKSLP) != 0) { 489 slp = TAILQ_FIRST(&nfssvc_sockpending); 490 if (slp) { 491 KASSERT((slp->ns_gflags & SLP_G_DOREC) 492 != 0); 493 TAILQ_REMOVE(&nfssvc_sockpending, slp, 494 ns_pending); 495 slp->ns_gflags &= ~SLP_G_DOREC; 496 slp->ns_sref++; 497 nfsd->nfsd_slp = slp; 498 } else 499 nfsd_head_flag &= ~NFSD_CHECKSLP; 500 } 501 KASSERT(nfsd->nfsd_slp == NULL || 502 nfsd->nfsd_slp->ns_sref > 0); 503 mutex_exit(&nfsd_lock); 504 if ((slp = nfsd->nfsd_slp) == NULL) 505 continue; 506 if (slp->ns_flags & SLP_VALID) { 507 bool more; 508 509 if (nfsdsock_testbits(slp, SLP_A_NEEDQ)) { 510 nfsrv_rcv(slp); 511 } 512 if (nfsdsock_testbits(slp, SLP_A_DISCONN)) { 513 nfsrv_zapsock(slp); 514 } 515 error = nfsrv_dorec(slp, nfsd, &nd, &more); 516 getmicrotime(&tv); 517 cur_usec = (u_quad_t)tv.tv_sec * 1000000 + 518 (u_quad_t)tv.tv_usec; 519 writes_todo = 0; 520 if (error) { 521 struct nfsrv_descript *nd2; 522 523 mutex_enter(&nfsd_lock); 524 nd2 = LIST_FIRST(&slp->ns_tq); 525 if (nd2 != NULL && 526 nd2->nd_time <= cur_usec) { 527 error = 0; 528 cacherep = RC_DOIT; 529 writes_todo = 1; 530 } 531 mutex_exit(&nfsd_lock); 532 } 533 if (error == 0 && more) { 534 nfsrv_wakenfsd(slp); 535 } 536 } 537 } else { 538 error = 0; 539 slp = nfsd->nfsd_slp; 540 } 541 KASSERT(slp != NULL); 542 KASSERT(nfsd->nfsd_slp == slp); 543 if (error || (slp->ns_flags & SLP_VALID) == 0) { 544 if (nd) { 545 nfsdreq_free(nd); 546 nd = NULL; 547 } 548 nfsd->nfsd_slp = NULL; 549 nfsrv_slpderef(slp); 550 continue; 551 } 552 sotype = slp->ns_so->so_type; 553 if (nd) { 554 getmicrotime(&nd->nd_starttime); 555 if (nd->nd_nam2) 556 nd->nd_nam = nd->nd_nam2; 557 else 558 nd->nd_nam = slp->ns_nam; 559 560 /* 561 * Check to see if authorization is needed. 562 */ 563 if (nfsd->nfsd_flag & NFSD_NEEDAUTH) { 564 nfsd->nfsd_flag &= ~NFSD_NEEDAUTH; 565 nsd->nsd_haddr = mtod(nd->nd_nam, 566 struct sockaddr_in *)->sin_addr.s_addr; 567 nsd->nsd_authlen = nfsd->nfsd_authlen; 568 nsd->nsd_verflen = nfsd->nfsd_verflen; 569 if (!copyout(nfsd->nfsd_authstr, 570 nsd->nsd_authstr, nfsd->nfsd_authlen) && 571 !copyout(nfsd->nfsd_verfstr, 572 nsd->nsd_verfstr, nfsd->nfsd_verflen) && 573 !copyout(nsd, argp, sizeof (*nsd))) { 574 uvm_lwp_rele(l); 575 return (ENEEDAUTH); 576 } 577 cacherep = RC_DROPIT; 578 } else 579 cacherep = nfsrv_getcache(nd, slp, &mreq); 580 581 if (nfsd->nfsd_flag & NFSD_AUTHFAIL) { 582 nfsd->nfsd_flag &= ~NFSD_AUTHFAIL; 583 nd->nd_procnum = NFSPROC_NOOP; 584 nd->nd_repstat = 585 (NFSERR_AUTHERR | AUTH_TOOWEAK); 586 cacherep = RC_DOIT; 587 } 588 } 589 590 /* 591 * Loop to get all the write rpc relies that have been 592 * gathered together. 593 */ 594 do { 595 switch (cacherep) { 596 case RC_DOIT: 597 mreq = NULL; 598 netexport_rdlock(); 599 if (writes_todo || nd == NULL || 600 (!(nd->nd_flag & ND_NFSV3) && 601 nd->nd_procnum == NFSPROC_WRITE && 602 nfsrvw_procrastinate > 0)) 603 error = nfsrv_writegather(&nd, slp, 604 l, &mreq); 605 else 606 error = 607 (*(nfsrv3_procs[nd->nd_procnum])) 608 (nd, slp, l, &mreq); 609 netexport_rdunlock(); 610 if (mreq == NULL) { 611 if (nd != NULL) { 612 if (nd->nd_nam2) 613 m_free(nd->nd_nam2); 614 } 615 break; 616 } 617 if (error) { 618 nfsstats.srv_errs++; 619 nfsrv_updatecache(nd, false, mreq); 620 if (nd->nd_nam2) 621 m_freem(nd->nd_nam2); 622 break; 623 } 624 nfsstats.srvrpccnt[nd->nd_procnum]++; 625 nfsrv_updatecache(nd, true, mreq); 626 nd->nd_mrep = (struct mbuf *)0; 627 case RC_REPLY: 628 m = mreq; 629 siz = 0; 630 while (m) { 631 siz += m->m_len; 632 m = m->m_next; 633 } 634 if (siz <= 0 || siz > NFS_MAXPACKET) { 635 printf("mbuf siz=%d\n",siz); 636 panic("Bad nfs svc reply"); 637 } 638 m = mreq; 639 m->m_pkthdr.len = siz; 640 m->m_pkthdr.rcvif = (struct ifnet *)0; 641 /* 642 * For stream protocols, prepend a Sun RPC 643 * Record Mark. 644 */ 645 if (sotype == SOCK_STREAM) { 646 M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); 647 *mtod(m, u_int32_t *) = 648 htonl(0x80000000 | siz); 649 } 650 nd->nd_mreq = m; 651 if (nfsrtton) { 652 nfsd_rt(slp->ns_so->so_type, nd, 653 cacherep); 654 } 655 error = nfsdsock_sendreply(slp, nd); 656 nd = NULL; 657 if (error == EPIPE) 658 nfsrv_zapsock(slp); 659 if (error == EINTR || error == ERESTART) { 660 nfsd->nfsd_slp = NULL; 661 nfsrv_slpderef(slp); 662 goto done; 663 } 664 break; 665 case RC_DROPIT: 666 if (nfsrtton) 667 nfsd_rt(sotype, nd, cacherep); 668 m_freem(nd->nd_mrep); 669 m_freem(nd->nd_nam2); 670 break; 671 } 672 if (nd) { 673 nfsdreq_free(nd); 674 nd = NULL; 675 } 676 677 /* 678 * Check to see if there are outstanding writes that 679 * need to be serviced. 680 */ 681 getmicrotime(&tv); 682 cur_usec = (u_quad_t)tv.tv_sec * 1000000 + 683 (u_quad_t)tv.tv_usec; 684 mutex_enter(&nfsd_lock); 685 if (LIST_FIRST(&slp->ns_tq) && 686 LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { 687 cacherep = RC_DOIT; 688 writes_todo = 1; 689 } else 690 writes_todo = 0; 691 mutex_exit(&nfsd_lock); 692 } while (writes_todo); 693 if (nfsrv_dorec(slp, nfsd, &nd, &dummy)) { 694 nfsd->nfsd_slp = NULL; 695 nfsrv_slpderef(slp); 696 } 697 } 698 done: 699 mutex_enter(&nfsd_lock); 700 TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); 701 doreinit = --nfs_numnfsd == 0; 702 if (doreinit) 703 nfssvc_sockhead_flag |= SLP_INIT; 704 mutex_exit(&nfsd_lock); 705 cv_destroy(&nfsd->nfsd_cv); 706 kmem_free(nfsd, sizeof(*nfsd)); 707 nsd->nsd_nfsd = NULL; 708 if (doreinit) 709 nfsrv_init(true); /* Reinitialize everything */ 710 uvm_lwp_rele(l); 711 return (error); 712 } 713 714 /* 715 * Shut down a socket associated with an nfssvc_sock structure. 716 * Should be called with the send lock set, if required. 717 * The trick here is to increment the sref at the start, so that the nfsds 718 * will stop using it and clear ns_flag at the end so that it will not be 719 * reassigned during cleanup. 720 * 721 * called at splsoftnet. 722 */ 723 void 724 nfsrv_zapsock(struct nfssvc_sock *slp) 725 { 726 struct nfsuid *nuidp, *nnuidp; 727 struct nfsrv_descript *nwp; 728 struct socket *so; 729 struct mbuf *m; 730 731 if (nfsdsock_drain(slp)) { 732 return; 733 } 734 mutex_enter(&nfsd_lock); 735 if (slp->ns_gflags & SLP_G_DOREC) { 736 TAILQ_REMOVE(&nfssvc_sockpending, slp, ns_pending); 737 slp->ns_gflags &= ~SLP_G_DOREC; 738 } 739 mutex_exit(&nfsd_lock); 740 741 so = slp->ns_so; 742 KASSERT(so != NULL); 743 solock(so); 744 so->so_upcall = NULL; 745 so->so_upcallarg = NULL; 746 so->so_rcv.sb_flags &= ~SB_UPCALL; 747 soshutdown(so, SHUT_RDWR); 748 sounlock(so); 749 750 m_freem(slp->ns_raw); 751 m = slp->ns_rec; 752 while (m != NULL) { 753 struct mbuf *n; 754 755 n = m->m_nextpkt; 756 m_freem(m); 757 m = n; 758 } 759 /* XXX what about freeing ns_frag ? */ 760 for (nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); nuidp != 0; 761 nuidp = nnuidp) { 762 nnuidp = TAILQ_NEXT(nuidp, nu_lru); 763 LIST_REMOVE(nuidp, nu_hash); 764 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru); 765 if (nuidp->nu_flag & NU_NAM) 766 m_freem(nuidp->nu_nam); 767 kmem_free(nuidp, sizeof(*nuidp)); 768 } 769 mutex_enter(&nfsd_lock); 770 while ((nwp = LIST_FIRST(&slp->ns_tq)) != NULL) { 771 LIST_REMOVE(nwp, nd_tq); 772 mutex_exit(&nfsd_lock); 773 nfsdreq_free(nwp); 774 mutex_enter(&nfsd_lock); 775 } 776 mutex_exit(&nfsd_lock); 777 } 778 779 /* 780 * Derefence a server socket structure. If it has no more references and 781 * is no longer valid, you can throw it away. 782 */ 783 void 784 nfsrv_slpderef(struct nfssvc_sock *slp) 785 { 786 uint32_t ref; 787 788 mutex_enter(&nfsd_lock); 789 KASSERT(slp->ns_sref > 0); 790 ref = --slp->ns_sref; 791 if (ref == 0 && (slp->ns_flags & SLP_VALID) == 0) { 792 file_t *fp; 793 794 KASSERT((slp->ns_gflags & SLP_G_DOREC) == 0); 795 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 796 mutex_exit(&nfsd_lock); 797 798 fp = slp->ns_fp; 799 if (fp != NULL) { 800 slp->ns_fp = NULL; 801 KASSERT(fp != NULL); 802 KASSERT(fp->f_data == slp->ns_so); 803 KASSERT(fp->f_count > 0); 804 closef(fp); 805 slp->ns_so = NULL; 806 } 807 808 if (slp->ns_nam) 809 m_free(slp->ns_nam); 810 nfsrv_sockfree(slp); 811 } else 812 mutex_exit(&nfsd_lock); 813 } 814 815 /* 816 * Initialize the data structures for the server. 817 * Handshake with any new nfsds starting up to avoid any chance of 818 * corruption. 819 */ 820 void 821 nfsrv_init(int terminating) 822 { 823 struct nfssvc_sock *slp; 824 825 if (!terminating) { 826 mutex_init(&nfsd_lock, MUTEX_DRIVER, IPL_SOFTNET); 827 cv_init(&nfsd_initcv, "nfsdinit"); 828 } 829 830 mutex_enter(&nfsd_lock); 831 if (!terminating && (nfssvc_sockhead_flag & SLP_INIT) != 0) 832 panic("nfsd init"); 833 nfssvc_sockhead_flag |= SLP_INIT; 834 835 if (terminating) { 836 KASSERT(SLIST_EMPTY(&nfsd_idle_head)); 837 KASSERT(TAILQ_EMPTY(&nfsd_head)); 838 while ((slp = TAILQ_FIRST(&nfssvc_sockhead)) != NULL) { 839 mutex_exit(&nfsd_lock); 840 KASSERT(slp->ns_sref == 0); 841 slp->ns_sref++; 842 nfsrv_zapsock(slp); 843 nfsrv_slpderef(slp); 844 mutex_enter(&nfsd_lock); 845 } 846 KASSERT(TAILQ_EMPTY(&nfssvc_sockpending)); 847 mutex_exit(&nfsd_lock); 848 nfsrv_cleancache(); /* And clear out server cache */ 849 } else { 850 mutex_exit(&nfsd_lock); 851 nfs_pub.np_valid = 0; 852 } 853 854 TAILQ_INIT(&nfssvc_sockhead); 855 TAILQ_INIT(&nfssvc_sockpending); 856 857 TAILQ_INIT(&nfsd_head); 858 SLIST_INIT(&nfsd_idle_head); 859 nfsd_head_flag &= ~NFSD_CHECKSLP; 860 861 nfs_udpsock = nfsrv_sockalloc(); 862 nfs_udp6sock = nfsrv_sockalloc(); 863 864 mutex_enter(&nfsd_lock); 865 nfssvc_sockhead_flag &= ~SLP_INIT; 866 cv_broadcast(&nfsd_initcv); 867 mutex_exit(&nfsd_lock); 868 } 869 870 void 871 nfsrv_fini(void) 872 { 873 874 nfsrv_init(true); 875 cv_destroy(&nfsd_initcv); 876 mutex_destroy(&nfsd_lock); 877 } 878 879 /* 880 * Add entries to the server monitor log. 881 */ 882 static void 883 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep) 884 { 885 struct timeval tv; 886 struct drt *rt; 887 888 rt = &nfsdrt.drt[nfsdrt.pos]; 889 if (cacherep == RC_DOIT) 890 rt->flag = 0; 891 else if (cacherep == RC_REPLY) 892 rt->flag = DRT_CACHEREPLY; 893 else 894 rt->flag = DRT_CACHEDROP; 895 if (sotype == SOCK_STREAM) 896 rt->flag |= DRT_TCP; 897 if (nd->nd_flag & ND_NFSV3) 898 rt->flag |= DRT_NFSV3; 899 rt->proc = nd->nd_procnum; 900 if (mtod(nd->nd_nam, struct sockaddr *)->sa_family == AF_INET) 901 rt->ipadr = mtod(nd->nd_nam, struct sockaddr_in *)->sin_addr.s_addr; 902 else 903 rt->ipadr = INADDR_ANY; 904 getmicrotime(&tv); 905 rt->resptime = ((tv.tv_sec - nd->nd_starttime.tv_sec) * 1000000) + 906 (tv.tv_usec - nd->nd_starttime.tv_usec); 907 rt->tstamp = tv; 908 nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ; 909 } 910