1 /* 2 * Copyright (c) 1989, 1993 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_syscalls.c 8.5 (Berkeley) 3/30/95 37 * $FreeBSD: src/sys/nfs/nfs_syscalls.c,v 1.58.2.1 2000/11/26 02:30:06 dillon Exp $ 38 * $DragonFly: src/sys/vfs/nfs/nfs_syscalls.c,v 1.31 2008/01/05 14:02:41 swildner Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/sysproto.h> 44 #include <sys/kernel.h> 45 #include <sys/sysctl.h> 46 #include <sys/file.h> 47 #include <sys/filedesc.h> 48 #include <sys/vnode.h> 49 #include <sys/malloc.h> 50 #include <sys/mount.h> 51 #include <sys/proc.h> 52 #include <sys/priv.h> 53 #include <sys/buf.h> 54 #include <sys/mbuf.h> 55 #include <sys/resourcevar.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/domain.h> 59 #include <sys/protosw.h> 60 #include <sys/nlookup.h> 61 #include <sys/mutex.h> 62 #include <vm/vm_zone.h> 63 64 #include <sys/mutex2.h> 65 #include <sys/thread2.h> 66 67 #include <netinet/in.h> 68 #include <netinet/tcp.h> 69 #include "xdr_subs.h" 70 #include "rpcv2.h" 71 #include "nfsproto.h" 72 #include "nfs.h" 73 #include "nfsm_subs.h" 74 #include "nfsrvcache.h" 75 #include "nfsmount.h" 76 #include "nfsnode.h" 77 #include "nfsrtt.h" 78 79 #include <sys/thread2.h> 80 81 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure"); 82 83 static int nuidhash_max = NFS_MAXUIDHASH; 84 85 #ifndef NFS_NOSERVER 86 static void nfsrv_zapsock (struct nfssvc_sock *slp); 87 #endif 88 89 #define TRUE 1 90 #define FALSE 0 91 92 SYSCTL_DECL(_vfs_nfs); 93 94 #ifndef NFS_NOSERVER 95 int nfsd_waiting = 0; 96 static struct nfsdrt nfsdrt; 97 static int nfs_numnfsd = 0; 98 static void nfsd_rt (int sotype, struct nfsrv_descript *nd, 99 int cacherep); 100 static int nfssvc_addsock (struct file *, struct sockaddr *, 101 struct thread *); 102 static int nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *); 103 104 static int nfs_privport = 0; 105 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, ""); 106 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, ""); 107 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, ""); 108 int nfs_soreserve = NFS_MAXPACKET * NFS_MAXASYNCBIO; 109 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, ""); 110 111 /* 112 * NFS server system calls 113 */ 114 115 #endif /* NFS_NOSERVER */ 116 /* 117 * nfssvc_args(int flag, caddr_t argp) 118 * 119 * Nfs server psuedo system call for the nfsd's 120 * Based on the flag value it either: 121 * - adds a socket to the selection list 122 * - remains in the kernel as an nfsd 123 * - remains in the kernel as an nfsiod 124 * 125 * MPALMOSTSAFE 126 */ 127 int 128 sys_nfssvc(struct nfssvc_args *uap) 129 { 130 #ifndef NFS_NOSERVER 131 struct nlookupdata nd; 132 struct file *fp; 133 struct sockaddr *nam; 134 struct nfsd_args nfsdarg; 135 struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs; 136 struct nfsd_cargs ncd; 137 struct nfsd *nfsd; 138 struct nfssvc_sock *slp; 139 struct nfsuid *nuidp; 140 struct nfsmount *nmp; 141 struct vnode *vp; 142 #endif /* NFS_NOSERVER */ 143 int error; 144 struct thread *td = curthread; 145 146 /* 147 * Must be super user 148 */ 149 error = priv_check(td, PRIV_ROOT); 150 if (error) 151 return (error); 152 153 lwkt_gettoken(&nfs_token); 154 155 while (nfssvc_sockhead_flag & SLP_INIT) { 156 nfssvc_sockhead_flag |= SLP_WANTINIT; 157 tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0); 158 } 159 if (uap->flag & NFSSVC_BIOD) 160 error = ENXIO; /* no longer need nfsiod's */ 161 #ifdef NFS_NOSERVER 162 else 163 error = ENXIO; 164 #else /* !NFS_NOSERVER */ 165 else if (uap->flag & NFSSVC_MNTD) { 166 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd)); 167 if (error) 168 goto done; 169 vp = NULL; 170 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE, 171 NLC_FOLLOW); 172 if (error == 0) 173 error = nlookup(&nd); 174 if (error == 0) 175 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &vp); 176 nlookup_done(&nd); 177 if (error) 178 goto done; 179 180 if ((vp->v_flag & VROOT) == 0) 181 error = EINVAL; 182 nmp = VFSTONFS(vp->v_mount); 183 vput(vp); 184 if (error) 185 goto done; 186 if ((nmp->nm_state & NFSSTA_MNTD) && 187 (uap->flag & NFSSVC_GOTAUTH) == 0) { 188 error = 0; 189 goto done; 190 } 191 nmp->nm_state |= NFSSTA_MNTD; 192 error = nfs_clientd(nmp, td->td_ucred, &ncd, uap->flag, 193 uap->argp, td); 194 } else if (uap->flag & NFSSVC_ADDSOCK) { 195 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg)); 196 if (error) 197 goto done; 198 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp); 199 if (error) 200 goto done; 201 /* 202 * Get the client address for connected sockets. 203 */ 204 if (nfsdarg.name == NULL || nfsdarg.namelen == 0) 205 nam = NULL; 206 else { 207 error = getsockaddr(&nam, nfsdarg.name, 208 nfsdarg.namelen); 209 if (error) { 210 fdrop(fp); 211 goto done; 212 } 213 } 214 error = nfssvc_addsock(fp, nam, td); 215 fdrop(fp); 216 } else { 217 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd)); 218 if (error) 219 goto done; 220 if ((uap->flag & NFSSVC_AUTHIN) && 221 ((nfsd = nsd->nsd_nfsd)) != NULL && 222 (nfsd->nfsd_slp->ns_flag & SLP_VALID)) { 223 slp = nfsd->nfsd_slp; 224 225 /* 226 * First check to see if another nfsd has already 227 * added this credential. 228 */ 229 for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first; 230 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 231 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid && 232 (!nfsd->nfsd_nd->nd_nam2 || 233 netaddr_match(NU_NETFAM(nuidp), 234 &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2))) 235 break; 236 } 237 if (nuidp) { 238 nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr); 239 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 240 } else { 241 /* 242 * Nope, so we will. 243 */ 244 if (slp->ns_numuids < nuidhash_max) { 245 slp->ns_numuids++; 246 nuidp = (struct nfsuid *) 247 kmalloc(sizeof (struct nfsuid), M_NFSUID, 248 M_WAITOK); 249 } else 250 nuidp = NULL; 251 if ((slp->ns_flag & SLP_VALID) == 0) { 252 if (nuidp) 253 kfree((caddr_t)nuidp, M_NFSUID); 254 } else { 255 if (nuidp == NULL) { 256 nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); 257 LIST_REMOVE(nuidp, nu_hash); 258 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, 259 nu_lru); 260 if (nuidp->nu_flag & NU_NAM) 261 FREE(nuidp->nu_nam, M_SONAME); 262 } 263 nuidp->nu_flag = 0; 264 nuidp->nu_cr = nsd->nsd_cr; 265 if (nuidp->nu_cr.cr_ngroups > NGROUPS) 266 nuidp->nu_cr.cr_ngroups = NGROUPS; 267 nuidp->nu_cr.cr_ref = 1; 268 nuidp->nu_timestamp = nsd->nsd_timestamp; 269 nuidp->nu_expire = time_second + nsd->nsd_ttl; 270 /* 271 * and save the session key in nu_key. 272 */ 273 bcopy(nsd->nsd_key, nuidp->nu_key, 274 sizeof (nsd->nsd_key)); 275 if (nfsd->nfsd_nd->nd_nam2) { 276 struct sockaddr_in *saddr; 277 278 saddr = (struct sockaddr_in *) 279 nfsd->nfsd_nd->nd_nam2; 280 switch (saddr->sin_family) { 281 case AF_INET: 282 nuidp->nu_flag |= NU_INETADDR; 283 nuidp->nu_inetaddr = 284 saddr->sin_addr.s_addr; 285 break; 286 case AF_ISO: 287 default: 288 nuidp->nu_flag |= NU_NAM; 289 nuidp->nu_nam = 290 dup_sockaddr(nfsd->nfsd_nd->nd_nam2); 291 break; 292 }; 293 } 294 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp, 295 nu_lru); 296 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid), 297 nuidp, nu_hash); 298 nfsrv_setcred(&nuidp->nu_cr, 299 &nfsd->nfsd_nd->nd_cr); 300 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 301 } 302 } 303 } 304 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd)) 305 nfsd->nfsd_flag |= NFSD_AUTHFAIL; 306 error = nfssvc_nfsd(nsd, uap->argp, td); 307 } 308 #endif /* NFS_NOSERVER */ 309 if (error == EINTR || error == ERESTART) 310 error = 0; 311 done: 312 lwkt_reltoken(&nfs_token); 313 return (error); 314 } 315 316 #ifndef NFS_NOSERVER 317 /* 318 * Adds a socket to the list for servicing by nfsds. 319 */ 320 static int 321 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td) 322 { 323 int siz; 324 struct nfssvc_sock *slp; 325 struct socket *so; 326 int error; 327 328 so = (struct socket *)fp->f_data; 329 #if 0 330 tslp = NULL; 331 /* 332 * Add it to the list, as required. 333 */ 334 if (so->so_proto->pr_protocol == IPPROTO_UDP) { 335 tslp = nfs_udpsock; 336 if (tslp->ns_flag & SLP_VALID) { 337 if (mynam != NULL) 338 FREE(mynam, M_SONAME); 339 return (EPERM); 340 } 341 } 342 #endif 343 /* 344 * Reserve buffer space in the socket. Note that due to bugs in 345 * Linux's delayed-ack code, serious performance degredation may 346 * occur with linux hosts if the minimum is used. 347 * 348 * NFS sockets are not limited to the standard sb_max or by 349 * resource limits. 350 */ 351 if (so->so_type == SOCK_STREAM) 352 siz = NFS_MAXPACKET + sizeof (u_long); 353 else 354 siz = NFS_MAXPACKET; 355 if (siz < nfs_soreserve) 356 siz = nfs_soreserve; 357 358 error = soreserve(so, siz, siz, NULL); 359 if (error) { 360 if (mynam != NULL) 361 FREE(mynam, M_SONAME); 362 return (error); 363 } 364 365 /* 366 * Set protocol specific options { for now TCP only } and 367 * reserve some space. For datagram sockets, this can get called 368 * repeatedly for the same socket, but that isn't harmful. 369 */ 370 if (so->so_type == SOCK_STREAM) { 371 struct sockopt sopt; 372 int val; 373 374 bzero(&sopt, sizeof sopt); 375 sopt.sopt_level = SOL_SOCKET; 376 sopt.sopt_name = SO_KEEPALIVE; 377 sopt.sopt_val = &val; 378 sopt.sopt_valsize = sizeof val; 379 val = 1; 380 sosetopt(so, &sopt); 381 } 382 if (so->so_proto->pr_domain->dom_family == AF_INET && 383 so->so_proto->pr_protocol == IPPROTO_TCP) { 384 struct sockopt sopt; 385 int val; 386 387 bzero(&sopt, sizeof sopt); 388 sopt.sopt_level = IPPROTO_TCP; 389 sopt.sopt_name = TCP_NODELAY; 390 sopt.sopt_val = &val; 391 sopt.sopt_valsize = sizeof val; 392 val = 1; 393 sosetopt(so, &sopt); 394 } 395 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR); 396 so->so_rcv.ssb_timeo = 0; 397 atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR); 398 so->so_snd.ssb_timeo = 0; 399 400 slp = (struct nfssvc_sock *)kmalloc(sizeof (struct nfssvc_sock), 401 M_NFSSVC, M_WAITOK | M_ZERO); 402 mtx_init(&slp->ns_solock); 403 STAILQ_INIT(&slp->ns_rec); 404 TAILQ_INIT(&slp->ns_uidlruhead); 405 lwkt_token_init(&slp->ns_token, 1, "nfssrv_token"); 406 407 lwkt_gettoken(&nfs_token); 408 TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain); 409 nfsrv_slpref(slp); 410 lwkt_gettoken(&slp->ns_token); 411 412 slp->ns_so = so; 413 slp->ns_nam = mynam; 414 fp->f_count++; 415 slp->ns_fp = fp; 416 417 so->so_upcallarg = (caddr_t)slp; 418 so->so_upcall = nfsrv_rcv_upcall; 419 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL); 420 slp->ns_flag = (SLP_VALID | SLP_NEEDQ); 421 nfsrv_wakenfsd(slp, 1); 422 423 lwkt_reltoken(&slp->ns_token); 424 lwkt_reltoken(&nfs_token); 425 426 return (0); 427 } 428 429 /* 430 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests 431 * until it is killed by a signal. 432 */ 433 static int 434 nfssvc_nfsd(struct nfsd_srvargs *nsd, caddr_t argp, struct thread *td) 435 { 436 int siz; 437 struct nfssvc_sock *slp; 438 struct nfsd *nfsd = nsd->nsd_nfsd; 439 struct nfsrv_descript *nd = NULL; 440 struct mbuf *m, *mreq; 441 int error = 0, cacherep, sotype, writes_todo; 442 int procrastinate; 443 u_quad_t cur_usec; 444 445 #ifndef nolint 446 cacherep = RC_DOIT; 447 writes_todo = 0; 448 #endif 449 lwkt_gettoken(&nfs_token); 450 451 if (nfsd == NULL) { 452 nsd->nsd_nfsd = nfsd = (struct nfsd *) 453 kmalloc(sizeof (struct nfsd), M_NFSD, M_WAITOK|M_ZERO); 454 nfsd->nfsd_td = td; 455 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); 456 nfs_numnfsd++; 457 } 458 459 /* 460 * Loop getting rpc requests until SIGKILL. 461 */ 462 for (;;) { 463 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) { 464 while (nfsd->nfsd_slp == NULL && 465 (nfsd_head_flag & NFSD_CHECKSLP) == 0) { 466 nfsd->nfsd_flag |= NFSD_WAITING; 467 nfsd_waiting++; 468 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0); 469 nfsd_waiting--; 470 if (error) 471 goto done; 472 } 473 if (nfsd->nfsd_slp == NULL && 474 (nfsd_head_flag & NFSD_CHECKSLP) != 0) { 475 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 476 if ((slp->ns_flag & (SLP_VALID | SLP_DOREC)) 477 == (SLP_VALID | SLP_DOREC)) { 478 slp->ns_flag &= ~SLP_DOREC; 479 nfsrv_slpref(slp); 480 nfsd->nfsd_slp = slp; 481 break; 482 } 483 } 484 if (slp == 0) 485 nfsd_head_flag &= ~NFSD_CHECKSLP; 486 } 487 if ((slp = nfsd->nfsd_slp) == NULL) 488 continue; 489 490 lwkt_reltoken(&nfs_token); 491 lwkt_gettoken(&slp->ns_token); 492 493 if (slp->ns_flag & SLP_VALID) { 494 if (slp->ns_flag & SLP_DISCONN) 495 nfsrv_zapsock(slp); 496 else if (slp->ns_flag & SLP_NEEDQ) { 497 slp->ns_flag &= ~SLP_NEEDQ; 498 (void) nfs_slplock(slp, 1); 499 nfsrv_rcv(slp->ns_so, (caddr_t)slp, 500 MB_WAIT); 501 nfs_slpunlock(slp); 502 } 503 error = nfsrv_dorec(slp, nfsd, &nd); 504 cur_usec = nfs_curusec(); 505 if (error && slp->ns_tq.lh_first && 506 slp->ns_tq.lh_first->nd_time <= cur_usec) { 507 error = 0; 508 cacherep = RC_DOIT; 509 writes_todo = 1; 510 } else 511 writes_todo = 0; 512 nfsd->nfsd_flag |= NFSD_REQINPROG; 513 } 514 } else { 515 error = 0; 516 slp = nfsd->nfsd_slp; 517 lwkt_reltoken(&nfs_token); 518 lwkt_gettoken(&slp->ns_token); 519 } 520 521 /* 522 * nfs_token not held here. slp token is held. 523 */ 524 if (error || (slp->ns_flag & SLP_VALID) == 0) { 525 if (nd) { 526 kfree((caddr_t)nd, M_NFSRVDESC); 527 nd = NULL; 528 } 529 nfsd->nfsd_slp = NULL; 530 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 531 lwkt_reltoken(&slp->ns_token); 532 lwkt_gettoken(&nfs_token); 533 nfsrv_slpderef(slp); 534 continue; 535 } 536 537 /* 538 * nfs_token not held here. slp token is held. 539 */ 540 sotype = slp->ns_so->so_type; 541 if (nd) { 542 getmicrotime(&nd->nd_starttime); 543 if (nd->nd_nam2) 544 nd->nd_nam = nd->nd_nam2; 545 else 546 nd->nd_nam = slp->ns_nam; 547 548 /* 549 * Check to see if authorization is needed. 550 */ 551 if (nfsd->nfsd_flag & NFSD_NEEDAUTH) { 552 nfsd->nfsd_flag &= ~NFSD_NEEDAUTH; 553 nsd->nsd_haddr = 554 ((struct sockaddr_in *) 555 nd->nd_nam)->sin_addr.s_addr; 556 nsd->nsd_authlen = nfsd->nfsd_authlen; 557 nsd->nsd_verflen = nfsd->nfsd_verflen; 558 if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr, 559 nfsd->nfsd_authlen) && 560 !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr, 561 nfsd->nfsd_verflen) && 562 !copyout((caddr_t)nsd, argp, sizeof (*nsd))) 563 lwkt_reltoken(&slp->ns_token); 564 return (ENEEDAUTH); 565 cacherep = RC_DROPIT; 566 } else { 567 cacherep = nfsrv_getcache(nd, slp, &mreq); 568 } 569 570 if (nfsd->nfsd_flag & NFSD_AUTHFAIL) { 571 nfsd->nfsd_flag &= ~NFSD_AUTHFAIL; 572 nd->nd_procnum = NFSPROC_NOOP; 573 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK); 574 cacherep = RC_DOIT; 575 } else if (nfs_privport) { 576 /* Check if source port is privileged */ 577 u_short port; 578 struct sockaddr *nam = nd->nd_nam; 579 struct sockaddr_in *sin; 580 581 sin = (struct sockaddr_in *)nam; 582 port = ntohs(sin->sin_port); 583 if (port >= IPPORT_RESERVED && 584 nd->nd_procnum != NFSPROC_NULL) { 585 nd->nd_procnum = NFSPROC_NOOP; 586 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK); 587 cacherep = RC_DOIT; 588 kprintf("NFS request from unprivileged port (%s:%d)\n", 589 inet_ntoa(sin->sin_addr), port); 590 } 591 } 592 593 } 594 595 /* 596 * Loop to get all the write rpc replies that have been 597 * gathered together. 598 * 599 * nfs_token not held here. slp token is held. 600 */ 601 do { 602 switch (cacherep) { 603 case RC_DOIT: 604 if (nd && (nd->nd_flag & ND_NFSV3)) 605 procrastinate = nfsrvw_procrastinate_v3; 606 else 607 procrastinate = nfsrvw_procrastinate; 608 if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE && 609 procrastinate > 0) 610 ) { 611 error = nfsrv_writegather(&nd, slp, 612 nfsd->nfsd_td, &mreq); 613 } else { 614 error = (*(nfsrv3_procs[nd->nd_procnum]))(nd, 615 slp, nfsd->nfsd_td, &mreq); 616 } 617 if (mreq == NULL) 618 break; 619 if (error != 0 && error != NFSERR_RETVOID) { 620 if (nd->nd_procnum != NQNFSPROC_VACATED) 621 nfsstats.srv_errs++; 622 nfsrv_updatecache(nd, FALSE, mreq); 623 if (nd->nd_nam2) 624 FREE(nd->nd_nam2, M_SONAME); 625 break; 626 } 627 nfsstats.srvrpccnt[nd->nd_procnum]++; 628 nfsrv_updatecache(nd, TRUE, mreq); 629 nd->nd_mrep = NULL; 630 case RC_REPLY: 631 m = mreq; 632 siz = 0; 633 while (m) { 634 siz += m->m_len; 635 m = m->m_next; 636 } 637 if (siz <= 0 || siz > NFS_MAXPACKET) { 638 kprintf("mbuf siz=%d\n",siz); 639 panic("Bad nfs svc reply"); 640 } 641 m = mreq; 642 m->m_pkthdr.len = siz; 643 m->m_pkthdr.rcvif = NULL; 644 /* 645 * For stream protocols, prepend a Sun RPC 646 * Record Mark. 647 */ 648 if (sotype == SOCK_STREAM) { 649 M_PREPEND(m, NFSX_UNSIGNED, MB_WAIT); 650 if (m == NULL) 651 return (ENOBUFS); 652 *mtod(m, u_int32_t *) = htonl(0x80000000 | siz); 653 } 654 if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED) 655 (void) nfs_slplock(slp, 1); 656 if (slp->ns_flag & SLP_VALID) 657 error = nfs_send(slp->ns_so, nd->nd_nam2, m, NULL); 658 else { 659 error = EPIPE; 660 m_freem(m); 661 } 662 if (nfsrtton) 663 nfsd_rt(sotype, nd, cacherep); 664 if (nd->nd_nam2) 665 FREE(nd->nd_nam2, M_SONAME); 666 if (nd->nd_mrep) 667 m_freem(nd->nd_mrep); 668 if (error == EPIPE) 669 nfsrv_zapsock(slp); 670 if (slp->ns_so->so_proto->pr_flags & PR_CONNREQUIRED) 671 nfs_slpunlock(slp); 672 if (error == EINTR || error == ERESTART) { 673 kfree((caddr_t)nd, M_NFSRVDESC); 674 lwkt_reltoken(&slp->ns_token); 675 lwkt_gettoken(&nfs_token); 676 nfsrv_slpderef(slp); 677 goto done; 678 } 679 break; 680 case RC_DROPIT: 681 if (nfsrtton) 682 nfsd_rt(sotype, nd, cacherep); 683 m_freem(nd->nd_mrep); 684 if (nd->nd_nam2) 685 FREE(nd->nd_nam2, M_SONAME); 686 break; 687 }; 688 if (nd) { 689 FREE((caddr_t)nd, M_NFSRVDESC); 690 nd = NULL; 691 } 692 693 /* 694 * Check to see if there are outstanding writes that 695 * need to be serviced. 696 */ 697 cur_usec = nfs_curusec(); 698 if (slp->ns_tq.lh_first && 699 slp->ns_tq.lh_first->nd_time <= cur_usec) { 700 cacherep = RC_DOIT; 701 writes_todo = 1; 702 } else { 703 writes_todo = 0; 704 } 705 } while (writes_todo); 706 707 /* 708 * nfs_token not held here. slp token is held. 709 */ 710 if (nfsrv_dorec(slp, nfsd, &nd)) { 711 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 712 nfsd->nfsd_slp = NULL; 713 lwkt_reltoken(&slp->ns_token); 714 lwkt_gettoken(&nfs_token); 715 nfsrv_slpderef(slp); 716 } else { 717 lwkt_reltoken(&slp->ns_token); 718 lwkt_gettoken(&nfs_token); 719 } 720 } 721 done: 722 TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); 723 kfree((caddr_t)nfsd, M_NFSD); 724 nsd->nsd_nfsd = NULL; 725 if (--nfs_numnfsd == 0) 726 nfsrv_init(TRUE); /* Reinitialize everything */ 727 728 lwkt_reltoken(&nfs_token); 729 return (error); 730 } 731 732 /* 733 * Shut down a socket associated with an nfssvc_sock structure. 734 * Should be called with the send lock set, if required. 735 * The trick here is to increment the sref at the start, so that the nfsds 736 * will stop using it and clear ns_flag at the end so that it will not be 737 * reassigned during cleanup. 738 */ 739 static void 740 nfsrv_zapsock(struct nfssvc_sock *slp) 741 { 742 struct nfsuid *nuidp, *nnuidp; 743 struct nfsrv_descript *nwp, *nnwp; 744 struct socket *so; 745 struct file *fp; 746 struct nfsrv_rec *rec; 747 748 slp->ns_flag &= ~SLP_ALLFLAGS; 749 fp = slp->ns_fp; 750 if (fp) { 751 slp->ns_fp = NULL; 752 so = slp->ns_so; 753 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_UPCALL); 754 so->so_upcall = NULL; 755 so->so_upcallarg = NULL; 756 soshutdown(so, SHUT_RDWR); 757 closef(fp, NULL); 758 if (slp->ns_nam) 759 FREE(slp->ns_nam, M_SONAME); 760 m_freem(slp->ns_raw); 761 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) { 762 --slp->ns_numrec; 763 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 764 if (rec->nr_address) 765 FREE(rec->nr_address, M_SONAME); 766 m_freem(rec->nr_packet); 767 kfree(rec, M_NFSRVDESC); 768 } 769 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru, 770 nnuidp) { 771 LIST_REMOVE(nuidp, nu_hash); 772 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru); 773 if (nuidp->nu_flag & NU_NAM) 774 FREE(nuidp->nu_nam, M_SONAME); 775 kfree((caddr_t)nuidp, M_NFSUID); 776 } 777 crit_enter(); 778 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) { 779 nnwp = nwp->nd_tq.le_next; 780 LIST_REMOVE(nwp, nd_tq); 781 kfree((caddr_t)nwp, M_NFSRVDESC); 782 } 783 LIST_INIT(&slp->ns_tq); 784 crit_exit(); 785 } 786 } 787 788 /* 789 * Derefence a server socket structure. If it has no more references and 790 * is no longer valid, you can throw it away. 791 * 792 * Must be holding nfs_token! 793 */ 794 void 795 nfsrv_slpderef(struct nfssvc_sock *slp) 796 { 797 ASSERT_LWKT_TOKEN_HELD(&nfs_token); 798 if (--slp->ns_sref == 0 && (slp->ns_flag & SLP_VALID) == 0) { 799 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 800 kfree((caddr_t)slp, M_NFSSVC); 801 } 802 } 803 804 void 805 nfsrv_slpref(struct nfssvc_sock *slp) 806 { 807 ASSERT_LWKT_TOKEN_HELD(&nfs_token); 808 ++slp->ns_sref; 809 } 810 811 /* 812 * Lock a socket against others. 813 * 814 * Returns 0 on failure, 1 on success. 815 */ 816 int 817 nfs_slplock(struct nfssvc_sock *slp, int wait) 818 { 819 mtx_t mtx = &slp->ns_solock; 820 821 if (wait) { 822 mtx_lock_ex(mtx, "nfsslplck", 0, 0); 823 return(1); 824 } else if (mtx_lock_ex_try(mtx) == 0) { 825 return(1); 826 } else { 827 return(0); 828 } 829 } 830 831 /* 832 * Unlock the stream socket for others. 833 */ 834 void 835 nfs_slpunlock(struct nfssvc_sock *slp) 836 { 837 mtx_t mtx = &slp->ns_solock; 838 839 mtx_unlock(mtx); 840 } 841 842 /* 843 * Initialize the data structures for the server. 844 * Handshake with any new nfsds starting up to avoid any chance of 845 * corruption. 846 */ 847 void 848 nfsrv_init(int terminating) 849 { 850 struct nfssvc_sock *slp, *nslp; 851 852 lwkt_gettoken(&nfs_token); 853 if (nfssvc_sockhead_flag & SLP_INIT) 854 panic("nfsd init"); 855 nfssvc_sockhead_flag |= SLP_INIT; 856 857 if (terminating) { 858 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) { 859 if (slp->ns_flag & SLP_VALID) 860 nfsrv_zapsock(slp); 861 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 862 kfree((caddr_t)slp, M_NFSSVC); 863 } 864 nfsrv_cleancache(); /* And clear out server cache */ 865 } else { 866 nfs_pub.np_valid = 0; 867 } 868 869 TAILQ_INIT(&nfssvc_sockhead); 870 nfssvc_sockhead_flag &= ~SLP_INIT; 871 if (nfssvc_sockhead_flag & SLP_WANTINIT) { 872 nfssvc_sockhead_flag &= ~SLP_WANTINIT; 873 wakeup((caddr_t)&nfssvc_sockhead); 874 } 875 876 TAILQ_INIT(&nfsd_head); 877 nfsd_head_flag &= ~NFSD_CHECKSLP; 878 879 lwkt_reltoken(&nfs_token); 880 881 #if 0 882 nfs_udpsock = (struct nfssvc_sock *) 883 kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO); 884 mtx_init(&nfs_udpsock->ns_solock); 885 STAILQ_INIT(&nfs_udpsock->ns_rec); 886 TAILQ_INIT(&nfs_udpsock->ns_uidlruhead); 887 TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain); 888 889 nfs_cltpsock = (struct nfssvc_sock *) 890 kmalloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK | M_ZERO); 891 mtx_init(&nfs_cltpsock->ns_solock); 892 STAILQ_INIT(&nfs_cltpsock->ns_rec); 893 TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead); 894 TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain); 895 #endif 896 } 897 898 /* 899 * Add entries to the server monitor log. 900 */ 901 static void 902 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep) 903 { 904 struct drt *rt; 905 906 rt = &nfsdrt.drt[nfsdrt.pos]; 907 if (cacherep == RC_DOIT) 908 rt->flag = 0; 909 else if (cacherep == RC_REPLY) 910 rt->flag = DRT_CACHEREPLY; 911 else 912 rt->flag = DRT_CACHEDROP; 913 if (sotype == SOCK_STREAM) 914 rt->flag |= DRT_TCP; 915 if (nd->nd_flag & ND_NFSV3) 916 rt->flag |= DRT_NFSV3; 917 rt->proc = nd->nd_procnum; 918 if (nd->nd_nam->sa_family == AF_INET) 919 rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr; 920 else 921 rt->ipadr = INADDR_ANY; 922 rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec); 923 getmicrotime(&rt->tstamp); 924 nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ; 925 } 926 #endif /* NFS_NOSERVER */ 927 928 static int nfs_defect = 0; 929 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, ""); 930 931 /* 932 * Get an authorization string for the uid by having the mount_nfs sitting 933 * on this mount point porpous out of the kernel and do it. 934 */ 935 int 936 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep, 937 struct ucred *cred, char **auth_str, int *auth_len, char *verf_str, 938 int *verf_len, NFSKERBKEY_T key /* return session key */) 939 { 940 int error = 0; 941 942 while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) { 943 nmp->nm_state |= NFSSTA_WANTAUTH; 944 (void) tsleep((caddr_t)&nmp->nm_authtype, 0, 945 "nfsauth1", 2 * hz); 946 error = nfs_sigintr(nmp, rep, rep->r_td); 947 if (error) { 948 nmp->nm_state &= ~NFSSTA_WANTAUTH; 949 return (error); 950 } 951 } 952 nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH); 953 nmp->nm_authstr = *auth_str = (char *)kmalloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK); 954 nmp->nm_authlen = RPCAUTH_MAXSIZ; 955 nmp->nm_verfstr = verf_str; 956 nmp->nm_verflen = *verf_len; 957 nmp->nm_authuid = cred->cr_uid; 958 wakeup((caddr_t)&nmp->nm_authstr); 959 960 /* 961 * And wait for mount_nfs to do its stuff. 962 */ 963 while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) { 964 (void) tsleep((caddr_t)&nmp->nm_authlen, 0, 965 "nfsauth2", 2 * hz); 966 error = nfs_sigintr(nmp, rep, rep->r_td); 967 } 968 if (nmp->nm_state & NFSSTA_AUTHERR) { 969 nmp->nm_state &= ~NFSSTA_AUTHERR; 970 error = EAUTH; 971 } 972 if (error) 973 kfree((caddr_t)*auth_str, M_TEMP); 974 else { 975 *auth_len = nmp->nm_authlen; 976 *verf_len = nmp->nm_verflen; 977 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key)); 978 } 979 nmp->nm_state &= ~NFSSTA_HASAUTH; 980 nmp->nm_state |= NFSSTA_WAITAUTH; 981 if (nmp->nm_state & NFSSTA_WANTAUTH) { 982 nmp->nm_state &= ~NFSSTA_WANTAUTH; 983 wakeup((caddr_t)&nmp->nm_authtype); 984 } 985 return (error); 986 } 987 988 /* 989 * Get a nickname authenticator and verifier. 990 */ 991 int 992 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str, 993 int *auth_len, char *verf_str, int verf_len) 994 { 995 struct nfsuid *nuidp; 996 u_int32_t *nickp, *verfp; 997 struct timeval ktvin, ktvout; 998 999 #ifdef DIAGNOSTIC 1000 if (verf_len < (4 * NFSX_UNSIGNED)) 1001 panic("nfs_getnickauth verf too small"); 1002 #endif 1003 for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first; 1004 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1005 if (nuidp->nu_cr.cr_uid == cred->cr_uid) 1006 break; 1007 } 1008 if (!nuidp || nuidp->nu_expire < time_second) 1009 return (EACCES); 1010 1011 /* 1012 * Move to the end of the lru list (end of lru == most recently used). 1013 */ 1014 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1015 TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru); 1016 1017 nickp = (u_int32_t *)kmalloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK); 1018 *nickp++ = txdr_unsigned(RPCAKN_NICKNAME); 1019 *nickp = txdr_unsigned(nuidp->nu_nickname); 1020 *auth_str = (char *)nickp; 1021 *auth_len = 2 * NFSX_UNSIGNED; 1022 1023 /* 1024 * Now we must encrypt the verifier and package it up. 1025 */ 1026 verfp = (u_int32_t *)verf_str; 1027 *verfp++ = txdr_unsigned(RPCAKN_NICKNAME); 1028 if (time_second > nuidp->nu_timestamp.tv_sec || 1029 (time_second == nuidp->nu_timestamp.tv_sec && 1030 time_second > nuidp->nu_timestamp.tv_usec)) 1031 getmicrotime(&nuidp->nu_timestamp); 1032 else 1033 nuidp->nu_timestamp.tv_usec++; 1034 ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec); 1035 ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1036 1037 /* 1038 * Now encrypt the timestamp verifier in ecb mode using the session 1039 * key. 1040 */ 1041 #ifdef NFSKERB 1042 XXX 1043 #else 1044 ktvout.tv_sec = 0; 1045 ktvout.tv_usec = 0; 1046 #endif 1047 1048 *verfp++ = ktvout.tv_sec; 1049 *verfp++ = ktvout.tv_usec; 1050 *verfp = 0; 1051 return (0); 1052 } 1053 1054 /* 1055 * Save the current nickname in a hash list entry on the mount point. 1056 */ 1057 int 1058 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len, 1059 NFSKERBKEY_T key, struct mbuf **mdp, char **dposp, 1060 struct mbuf *mrep) 1061 { 1062 struct nfsuid *nuidp; 1063 u_int32_t *tl; 1064 struct timeval ktvin, ktvout; 1065 u_int32_t nick; 1066 int deltasec, error = 0; 1067 struct nfsm_info info; 1068 1069 info.md = *mdp; 1070 info.dpos = *dposp; 1071 info.mrep = mrep; 1072 1073 if (len == (3 * NFSX_UNSIGNED)) { 1074 NULLOUT(tl = nfsm_dissect(&info, 3 * NFSX_UNSIGNED)); 1075 ktvin.tv_sec = *tl++; 1076 ktvin.tv_usec = *tl++; 1077 nick = fxdr_unsigned(u_int32_t, *tl); 1078 1079 /* 1080 * Decrypt the timestamp in ecb mode. 1081 */ 1082 #ifdef NFSKERB 1083 XXX 1084 #else 1085 ktvout.tv_sec = 0; 1086 ktvout.tv_usec = 0; 1087 #endif 1088 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec); 1089 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec); 1090 deltasec = time_second - ktvout.tv_sec; 1091 if (deltasec < 0) 1092 deltasec = -deltasec; 1093 /* 1094 * If ok, add it to the hash list for the mount point. 1095 */ 1096 if (deltasec <= NFS_KERBCLOCKSKEW) { 1097 if (nmp->nm_numuids < nuidhash_max) { 1098 nmp->nm_numuids++; 1099 nuidp = (struct nfsuid *) 1100 kmalloc(sizeof (struct nfsuid), M_NFSUID, 1101 M_WAITOK); 1102 } else { 1103 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); 1104 LIST_REMOVE(nuidp, nu_hash); 1105 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, 1106 nu_lru); 1107 } 1108 nuidp->nu_flag = 0; 1109 nuidp->nu_cr.cr_uid = cred->cr_uid; 1110 nuidp->nu_expire = time_second + NFS_KERBTTL; 1111 nuidp->nu_timestamp = ktvout; 1112 nuidp->nu_nickname = nick; 1113 bcopy(key, nuidp->nu_key, sizeof (key)); 1114 TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, 1115 nu_lru); 1116 LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid), 1117 nuidp, nu_hash); 1118 } 1119 } else { 1120 ERROROUT(nfsm_adv(&info, nfsm_rndup(len))); 1121 } 1122 nfsmout: 1123 *mdp = info.md; 1124 *dposp = info.dpos; 1125 return (error); 1126 } 1127