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 1.21 2005/06/06 15:09:38 drhodus 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/buf.h> 53 #include <sys/mbuf.h> 54 #include <sys/resourcevar.h> 55 #include <sys/socket.h> 56 #include <sys/socketvar.h> 57 #include <sys/domain.h> 58 #include <sys/protosw.h> 59 #include <sys/nlookup.h> 60 #include <vm/vm_zone.h> 61 62 #include <netinet/in.h> 63 #include <netinet/tcp.h> 64 #include "xdr_subs.h" 65 #include "rpcv2.h" 66 #include "nfsproto.h" 67 #include "nfs.h" 68 #include "nfsm_subs.h" 69 #include "nfsrvcache.h" 70 #include "nfsmount.h" 71 #include "nfsnode.h" 72 #include "nqnfs.h" 73 #include "nfsrtt.h" 74 75 #include <sys/thread2.h> 76 77 static MALLOC_DEFINE(M_NFSSVC, "NFS srvsock", "Nfs server structure"); 78 79 /* Global defs. */ 80 extern int32_t (*nfsrv3_procs[NFS_NPROCS]) (struct nfsrv_descript *nd, 81 struct nfssvc_sock *slp, 82 struct thread *td, 83 struct mbuf **mreqp); 84 extern int nfs_numasync; 85 extern time_t nqnfsstarttime; 86 extern int nqsrv_writeslack; 87 extern int nfsrtton; 88 extern struct nfsstats nfsstats; 89 extern int nfsrvw_procrastinate; 90 extern int nfsrvw_procrastinate_v3; 91 static int nuidhash_max = NFS_MAXUIDHASH; 92 93 #ifndef NFS_NOSERVER 94 static void nfsrv_zapsock (struct nfssvc_sock *slp); 95 #endif 96 static int nfssvc_iod (struct thread *); 97 98 #define TRUE 1 99 #define FALSE 0 100 101 static int nfs_asyncdaemon[NFS_MAXASYNCDAEMON]; 102 103 SYSCTL_DECL(_vfs_nfs); 104 105 #ifndef NFS_NOSERVER 106 int nfsd_waiting = 0; 107 static struct nfsdrt nfsdrt; 108 static int nfs_numnfsd = 0; 109 static int notstarted = 1; 110 static int modify_flag = 0; 111 static void nfsd_rt (int sotype, struct nfsrv_descript *nd, 112 int cacherep); 113 static int nfssvc_addsock (struct file *, struct sockaddr *, 114 struct thread *); 115 static int nfssvc_nfsd (struct nfsd_srvargs *,caddr_t,struct thread *); 116 117 static int nfs_privport = 0; 118 SYSCTL_INT(_vfs_nfs, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW, &nfs_privport, 0, ""); 119 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay, CTLFLAG_RW, &nfsrvw_procrastinate, 0, ""); 120 SYSCTL_INT(_vfs_nfs, OID_AUTO, gatherdelay_v3, CTLFLAG_RW, &nfsrvw_procrastinate_v3, 0, ""); 121 static int nfs_soreserve = 65535; 122 SYSCTL_INT(_vfs_nfs, OID_AUTO, soreserve, CTLFLAG_RW, &nfs_soreserve, 0, ""); 123 124 /* 125 * NFS server system calls 126 */ 127 128 #endif /* NFS_NOSERVER */ 129 /* 130 * nfssvc_args(int flag, caddr_t argp) 131 * 132 * Nfs server psuedo system call for the nfsd's 133 * Based on the flag value it either: 134 * - adds a socket to the selection list 135 * - remains in the kernel as an nfsd 136 * - remains in the kernel as an nfsiod 137 */ 138 int 139 nfssvc(struct nfssvc_args *uap) 140 { 141 #ifndef NFS_NOSERVER 142 struct nlookupdata nd; 143 struct file *fp; 144 struct sockaddr *nam; 145 struct nfsd_args nfsdarg; 146 struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs; 147 struct nfsd_cargs ncd; 148 struct nfsd *nfsd; 149 struct nfssvc_sock *slp; 150 struct nfsuid *nuidp; 151 struct nfsmount *nmp; 152 struct vnode *vp; 153 #endif /* NFS_NOSERVER */ 154 int error; 155 struct thread *td = curthread; 156 157 /* 158 * Must be super user 159 */ 160 error = suser(td); 161 if(error) 162 return (error); 163 KKASSERT(td->td_proc); /* for ucred and p_fd */ 164 while (nfssvc_sockhead_flag & SLP_INIT) { 165 nfssvc_sockhead_flag |= SLP_WANTINIT; 166 (void) tsleep((caddr_t)&nfssvc_sockhead, 0, "nfsd init", 0); 167 } 168 if (uap->flag & NFSSVC_BIOD) 169 error = nfssvc_iod(td); 170 #ifdef NFS_NOSERVER 171 else 172 error = ENXIO; 173 #else /* !NFS_NOSERVER */ 174 else if (uap->flag & NFSSVC_MNTD) { 175 error = copyin(uap->argp, (caddr_t)&ncd, sizeof (ncd)); 176 if (error) 177 return (error); 178 vp = NULL; 179 error = nlookup_init(&nd, ncd.ncd_dirp, UIO_USERSPACE, 180 NLC_FOLLOW); 181 if (error == 0) 182 error = nlookup(&nd); 183 if (error == 0) 184 error = cache_vget(nd.nl_ncp, nd.nl_cred, LK_EXCLUSIVE, &vp); 185 nlookup_done(&nd); 186 if (error) 187 return (error); 188 189 if ((vp->v_flag & VROOT) == 0) 190 error = EINVAL; 191 nmp = VFSTONFS(vp->v_mount); 192 vput(vp); 193 if (error) 194 return (error); 195 if ((nmp->nm_state & NFSSTA_MNTD) && 196 (uap->flag & NFSSVC_GOTAUTH) == 0) 197 return (0); 198 nmp->nm_state |= NFSSTA_MNTD; 199 error = nqnfs_clientd(nmp, td->td_proc->p_ucred, &ncd, uap->flag, 200 uap->argp, td); 201 } else if (uap->flag & NFSSVC_ADDSOCK) { 202 error = copyin(uap->argp, (caddr_t)&nfsdarg, sizeof(nfsdarg)); 203 if (error) 204 return (error); 205 error = holdsock(td->td_proc->p_fd, nfsdarg.sock, &fp); 206 if (error) 207 return (error); 208 /* 209 * Get the client address for connected sockets. 210 */ 211 if (nfsdarg.name == NULL || nfsdarg.namelen == 0) 212 nam = (struct sockaddr *)0; 213 else { 214 error = getsockaddr(&nam, nfsdarg.name, 215 nfsdarg.namelen); 216 if (error) { 217 fdrop(fp, td); 218 return (error); 219 } 220 } 221 error = nfssvc_addsock(fp, nam, td); 222 fdrop(fp, td); 223 } else { 224 error = copyin(uap->argp, (caddr_t)nsd, sizeof (*nsd)); 225 if (error) 226 return (error); 227 if ((uap->flag & NFSSVC_AUTHIN) && 228 ((nfsd = nsd->nsd_nfsd)) != NULL && 229 (nfsd->nfsd_slp->ns_flag & SLP_VALID)) { 230 slp = nfsd->nfsd_slp; 231 232 /* 233 * First check to see if another nfsd has already 234 * added this credential. 235 */ 236 for (nuidp = NUIDHASH(slp,nsd->nsd_cr.cr_uid)->lh_first; 237 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 238 if (nuidp->nu_cr.cr_uid == nsd->nsd_cr.cr_uid && 239 (!nfsd->nfsd_nd->nd_nam2 || 240 netaddr_match(NU_NETFAM(nuidp), 241 &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2))) 242 break; 243 } 244 if (nuidp) { 245 nfsrv_setcred(&nuidp->nu_cr,&nfsd->nfsd_nd->nd_cr); 246 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 247 } else { 248 /* 249 * Nope, so we will. 250 */ 251 if (slp->ns_numuids < nuidhash_max) { 252 slp->ns_numuids++; 253 nuidp = (struct nfsuid *) 254 malloc(sizeof (struct nfsuid), M_NFSUID, 255 M_WAITOK); 256 } else 257 nuidp = (struct nfsuid *)0; 258 if ((slp->ns_flag & SLP_VALID) == 0) { 259 if (nuidp) 260 free((caddr_t)nuidp, M_NFSUID); 261 } else { 262 if (nuidp == (struct nfsuid *)0) { 263 nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); 264 LIST_REMOVE(nuidp, nu_hash); 265 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, 266 nu_lru); 267 if (nuidp->nu_flag & NU_NAM) 268 FREE(nuidp->nu_nam, M_SONAME); 269 } 270 nuidp->nu_flag = 0; 271 nuidp->nu_cr = nsd->nsd_cr; 272 if (nuidp->nu_cr.cr_ngroups > NGROUPS) 273 nuidp->nu_cr.cr_ngroups = NGROUPS; 274 nuidp->nu_cr.cr_ref = 1; 275 nuidp->nu_timestamp = nsd->nsd_timestamp; 276 nuidp->nu_expire = time_second + nsd->nsd_ttl; 277 /* 278 * and save the session key in nu_key. 279 */ 280 bcopy(nsd->nsd_key, nuidp->nu_key, 281 sizeof (nsd->nsd_key)); 282 if (nfsd->nfsd_nd->nd_nam2) { 283 struct sockaddr_in *saddr; 284 285 saddr = (struct sockaddr_in *) 286 nfsd->nfsd_nd->nd_nam2; 287 switch (saddr->sin_family) { 288 case AF_INET: 289 nuidp->nu_flag |= NU_INETADDR; 290 nuidp->nu_inetaddr = 291 saddr->sin_addr.s_addr; 292 break; 293 case AF_ISO: 294 default: 295 nuidp->nu_flag |= NU_NAM; 296 nuidp->nu_nam = 297 dup_sockaddr(nfsd->nfsd_nd->nd_nam2); 298 break; 299 }; 300 } 301 TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp, 302 nu_lru); 303 LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid), 304 nuidp, nu_hash); 305 nfsrv_setcred(&nuidp->nu_cr, 306 &nfsd->nfsd_nd->nd_cr); 307 nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; 308 } 309 } 310 } 311 if ((uap->flag & NFSSVC_AUTHINFAIL) && (nfsd = nsd->nsd_nfsd)) 312 nfsd->nfsd_flag |= NFSD_AUTHFAIL; 313 error = nfssvc_nfsd(nsd, uap->argp, td); 314 } 315 #endif /* NFS_NOSERVER */ 316 if (error == EINTR || error == ERESTART) 317 error = 0; 318 return (error); 319 } 320 321 #ifndef NFS_NOSERVER 322 /* 323 * Adds a socket to the list for servicing by nfsds. 324 */ 325 static int 326 nfssvc_addsock(struct file *fp, struct sockaddr *mynam, struct thread *td) 327 { 328 int siz; 329 struct nfssvc_sock *slp; 330 struct socket *so; 331 int error; 332 333 so = (struct socket *)fp->f_data; 334 #if 0 335 tslp = (struct nfssvc_sock *)0; 336 /* 337 * Add it to the list, as required. 338 */ 339 if (so->so_proto->pr_protocol == IPPROTO_UDP) { 340 tslp = nfs_udpsock; 341 if (tslp->ns_flag & SLP_VALID) { 342 if (mynam != NULL) 343 FREE(mynam, M_SONAME); 344 return (EPERM); 345 } 346 } 347 #endif 348 /* 349 * Reserve buffer space in the socket. Note that due to bugs in 350 * Linux's delayed-ack code, serious performance degredation may 351 * occur with linux hosts if the minimum is used. 352 */ 353 if (so->so_type == SOCK_STREAM) 354 siz = NFS_MAXPACKET + sizeof (u_long); 355 else 356 siz = NFS_MAXPACKET; 357 if (siz < nfs_soreserve) 358 siz = nfs_soreserve; 359 if (siz > sb_max_adj) { 360 printf("Warning: vfs.nfs.soreserve (%d) " 361 "limited to adjusted sb_max (%ld)\n", 362 nfs_soreserve, sb_max_adj); 363 siz = sb_max_adj; 364 } 365 366 error = soreserve(so, siz, siz, &td->td_proc->p_rlimit[RLIMIT_SBSIZE]); 367 if (error) { 368 if (mynam != NULL) 369 FREE(mynam, M_SONAME); 370 return (error); 371 } 372 373 /* 374 * Set protocol specific options { for now TCP only } and 375 * reserve some space. For datagram sockets, this can get called 376 * repeatedly for the same socket, but that isn't harmful. 377 */ 378 if (so->so_type == SOCK_STREAM) { 379 struct sockopt sopt; 380 int val; 381 382 bzero(&sopt, sizeof sopt); 383 sopt.sopt_level = SOL_SOCKET; 384 sopt.sopt_name = SO_KEEPALIVE; 385 sopt.sopt_val = &val; 386 sopt.sopt_valsize = sizeof val; 387 val = 1; 388 sosetopt(so, &sopt); 389 } 390 if (so->so_proto->pr_domain->dom_family == AF_INET && 391 so->so_proto->pr_protocol == IPPROTO_TCP) { 392 struct sockopt sopt; 393 int val; 394 395 bzero(&sopt, sizeof sopt); 396 sopt.sopt_level = IPPROTO_TCP; 397 sopt.sopt_name = TCP_NODELAY; 398 sopt.sopt_val = &val; 399 sopt.sopt_valsize = sizeof val; 400 val = 1; 401 sosetopt(so, &sopt); 402 } 403 so->so_rcv.sb_flags &= ~SB_NOINTR; 404 so->so_rcv.sb_timeo = 0; 405 so->so_snd.sb_flags &= ~SB_NOINTR; 406 so->so_snd.sb_timeo = 0; 407 408 slp = (struct nfssvc_sock *) 409 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK); 410 bzero((caddr_t)slp, sizeof (struct nfssvc_sock)); 411 STAILQ_INIT(&slp->ns_rec); 412 TAILQ_INIT(&slp->ns_uidlruhead); 413 TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain); 414 415 slp->ns_so = so; 416 slp->ns_nam = mynam; 417 fp->f_count++; 418 slp->ns_fp = fp; 419 crit_enter(); 420 so->so_upcallarg = (caddr_t)slp; 421 so->so_upcall = nfsrv_rcv; 422 so->so_rcv.sb_flags |= SB_UPCALL; 423 slp->ns_flag = (SLP_VALID | SLP_NEEDQ); 424 nfsrv_wakenfsd(slp, 1); 425 crit_exit(); 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 if (nfsd == (struct nfsd *)0) { 450 nsd->nsd_nfsd = nfsd = (struct nfsd *) 451 malloc(sizeof (struct nfsd), M_NFSD, M_WAITOK); 452 bzero((caddr_t)nfsd, sizeof (struct nfsd)); 453 crit_enter(); 454 nfsd->nfsd_td = td; 455 TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); 456 nfs_numnfsd++; 457 } else 458 crit_enter(); 459 460 /* 461 * Loop getting rpc requests until SIGKILL. 462 */ 463 for (;;) { 464 if ((nfsd->nfsd_flag & NFSD_REQINPROG) == 0) { 465 while (nfsd->nfsd_slp == NULL && 466 (nfsd_head_flag & NFSD_CHECKSLP) == 0) { 467 nfsd->nfsd_flag |= NFSD_WAITING; 468 nfsd_waiting++; 469 error = tsleep((caddr_t)nfsd, PCATCH, "nfsd", 0); 470 nfsd_waiting--; 471 if (error) 472 goto done; 473 } 474 if (nfsd->nfsd_slp == NULL && 475 (nfsd_head_flag & NFSD_CHECKSLP) != 0) { 476 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 477 if ((slp->ns_flag & (SLP_VALID | SLP_DOREC)) 478 == (SLP_VALID | SLP_DOREC)) { 479 slp->ns_flag &= ~SLP_DOREC; 480 slp->ns_sref++; 481 nfsd->nfsd_slp = slp; 482 break; 483 } 484 } 485 if (slp == 0) 486 nfsd_head_flag &= ~NFSD_CHECKSLP; 487 } 488 if ((slp = nfsd->nfsd_slp) == (struct nfssvc_sock *)0) 489 continue; 490 if (slp->ns_flag & SLP_VALID) { 491 if (slp->ns_flag & SLP_DISCONN) 492 nfsrv_zapsock(slp); 493 else if (slp->ns_flag & SLP_NEEDQ) { 494 slp->ns_flag &= ~SLP_NEEDQ; 495 (void) nfs_slplock(slp, 1); 496 nfsrv_rcv(slp->ns_so, (caddr_t)slp, 497 MB_WAIT); 498 nfs_slpunlock(slp); 499 } 500 error = nfsrv_dorec(slp, nfsd, &nd); 501 cur_usec = nfs_curusec(); 502 if (error && slp->ns_tq.lh_first && 503 slp->ns_tq.lh_first->nd_time <= cur_usec) { 504 error = 0; 505 cacherep = RC_DOIT; 506 writes_todo = 1; 507 } else 508 writes_todo = 0; 509 nfsd->nfsd_flag |= NFSD_REQINPROG; 510 } 511 } else { 512 error = 0; 513 slp = nfsd->nfsd_slp; 514 } 515 if (error || (slp->ns_flag & SLP_VALID) == 0) { 516 if (nd) { 517 free((caddr_t)nd, M_NFSRVDESC); 518 nd = NULL; 519 } 520 nfsd->nfsd_slp = (struct nfssvc_sock *)0; 521 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 522 nfsrv_slpderef(slp); 523 continue; 524 } 525 crit_exit(); 526 sotype = slp->ns_so->so_type; 527 if (nd) { 528 getmicrotime(&nd->nd_starttime); 529 if (nd->nd_nam2) 530 nd->nd_nam = nd->nd_nam2; 531 else 532 nd->nd_nam = slp->ns_nam; 533 534 /* 535 * Check to see if authorization is needed. 536 */ 537 if (nfsd->nfsd_flag & NFSD_NEEDAUTH) { 538 nfsd->nfsd_flag &= ~NFSD_NEEDAUTH; 539 nsd->nsd_haddr = 540 ((struct sockaddr_in *) 541 nd->nd_nam)->sin_addr.s_addr; 542 nsd->nsd_authlen = nfsd->nfsd_authlen; 543 nsd->nsd_verflen = nfsd->nfsd_verflen; 544 if (!copyout(nfsd->nfsd_authstr,nsd->nsd_authstr, 545 nfsd->nfsd_authlen) && 546 !copyout(nfsd->nfsd_verfstr, nsd->nsd_verfstr, 547 nfsd->nfsd_verflen) && 548 !copyout((caddr_t)nsd, argp, sizeof (*nsd))) 549 return (ENEEDAUTH); 550 cacherep = RC_DROPIT; 551 } else 552 cacherep = nfsrv_getcache(nd, slp, &mreq); 553 554 /* 555 * Check for just starting up for NQNFS and send 556 * fake "try again later" replies to the NQNFS clients. 557 */ 558 if (notstarted && nqnfsstarttime <= time_second) { 559 if (modify_flag) { 560 nqnfsstarttime = time_second + nqsrv_writeslack; 561 modify_flag = 0; 562 } else 563 notstarted = 0; 564 } 565 if (notstarted) { 566 if ((nd->nd_flag & ND_NQNFS) == 0) 567 cacherep = RC_DROPIT; 568 else if (nd->nd_procnum != NFSPROC_WRITE) { 569 nd->nd_procnum = NFSPROC_NOOP; 570 nd->nd_repstat = NQNFS_TRYLATER; 571 cacherep = RC_DOIT; 572 } else 573 modify_flag = 1; 574 } else if (nfsd->nfsd_flag & NFSD_AUTHFAIL) { 575 nfsd->nfsd_flag &= ~NFSD_AUTHFAIL; 576 nd->nd_procnum = NFSPROC_NOOP; 577 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK); 578 cacherep = RC_DOIT; 579 } else if (nfs_privport) { 580 /* Check if source port is privileged */ 581 u_short port; 582 struct sockaddr *nam = nd->nd_nam; 583 struct sockaddr_in *sin; 584 585 sin = (struct sockaddr_in *)nam; 586 port = ntohs(sin->sin_port); 587 if (port >= IPPORT_RESERVED && 588 nd->nd_procnum != NFSPROC_NULL) { 589 nd->nd_procnum = NFSPROC_NOOP; 590 nd->nd_repstat = (NFSERR_AUTHERR | AUTH_TOOWEAK); 591 cacherep = RC_DOIT; 592 printf("NFS request from unprivileged port (%s:%d)\n", 593 inet_ntoa(sin->sin_addr), port); 594 } 595 } 596 597 } 598 599 /* 600 * Loop to get all the write rpc relies that have been 601 * gathered together. 602 */ 603 do { 604 switch (cacherep) { 605 case RC_DOIT: 606 if (nd && (nd->nd_flag & ND_NFSV3)) 607 procrastinate = nfsrvw_procrastinate_v3; 608 else 609 procrastinate = nfsrvw_procrastinate; 610 if (writes_todo || (nd->nd_procnum == NFSPROC_WRITE && 611 procrastinate > 0 && !notstarted)) 612 error = nfsrv_writegather(&nd, slp, 613 nfsd->nfsd_td, &mreq); 614 else 615 error = (*(nfsrv3_procs[nd->nd_procnum]))(nd, 616 slp, nfsd->nfsd_td, &mreq); 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 = (struct mbuf *)0; 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 printf("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 = (struct ifnet *)0; 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 free((caddr_t)nd, M_NFSRVDESC); 674 nfsrv_slpderef(slp); 675 crit_enter(); 676 goto done; 677 } 678 break; 679 case RC_DROPIT: 680 if (nfsrtton) 681 nfsd_rt(sotype, nd, cacherep); 682 m_freem(nd->nd_mrep); 683 if (nd->nd_nam2) 684 FREE(nd->nd_nam2, M_SONAME); 685 break; 686 }; 687 if (nd) { 688 FREE((caddr_t)nd, M_NFSRVDESC); 689 nd = NULL; 690 } 691 692 /* 693 * Check to see if there are outstanding writes that 694 * need to be serviced. 695 */ 696 cur_usec = nfs_curusec(); 697 crit_enter(); 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 crit_exit(); 705 } while (writes_todo); 706 crit_enter(); 707 if (nfsrv_dorec(slp, nfsd, &nd)) { 708 nfsd->nfsd_flag &= ~NFSD_REQINPROG; 709 nfsd->nfsd_slp = NULL; 710 nfsrv_slpderef(slp); 711 } 712 } 713 done: 714 TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); 715 crit_exit(); 716 free((caddr_t)nfsd, M_NFSD); 717 nsd->nsd_nfsd = (struct nfsd *)0; 718 if (--nfs_numnfsd == 0) 719 nfsrv_init(TRUE); /* Reinitialize everything */ 720 return (error); 721 } 722 723 /* 724 * Shut down a socket associated with an nfssvc_sock structure. 725 * Should be called with the send lock set, if required. 726 * The trick here is to increment the sref at the start, so that the nfsds 727 * will stop using it and clear ns_flag at the end so that it will not be 728 * reassigned during cleanup. 729 */ 730 static void 731 nfsrv_zapsock(struct nfssvc_sock *slp) 732 { 733 struct nfsuid *nuidp, *nnuidp; 734 struct nfsrv_descript *nwp, *nnwp; 735 struct socket *so; 736 struct file *fp; 737 struct nfsrv_rec *rec; 738 739 slp->ns_flag &= ~SLP_ALLFLAGS; 740 fp = slp->ns_fp; 741 if (fp) { 742 slp->ns_fp = (struct file *)0; 743 so = slp->ns_so; 744 so->so_rcv.sb_flags &= ~SB_UPCALL; 745 so->so_upcall = NULL; 746 so->so_upcallarg = NULL; 747 soshutdown(so, 2); 748 closef(fp, NULL); 749 if (slp->ns_nam) 750 FREE(slp->ns_nam, M_SONAME); 751 m_freem(slp->ns_raw); 752 while ((rec = STAILQ_FIRST(&slp->ns_rec)) != NULL) { 753 --slp->ns_numrec; 754 STAILQ_REMOVE_HEAD(&slp->ns_rec, nr_link); 755 if (rec->nr_address) 756 FREE(rec->nr_address, M_SONAME); 757 m_freem(rec->nr_packet); 758 free(rec, M_NFSRVDESC); 759 } 760 TAILQ_FOREACH_MUTABLE(nuidp, &slp->ns_uidlruhead, nu_lru, 761 nnuidp) { 762 LIST_REMOVE(nuidp, nu_hash); 763 TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru); 764 if (nuidp->nu_flag & NU_NAM) 765 FREE(nuidp->nu_nam, M_SONAME); 766 free((caddr_t)nuidp, M_NFSUID); 767 } 768 crit_enter(); 769 for (nwp = slp->ns_tq.lh_first; nwp; nwp = nnwp) { 770 nnwp = nwp->nd_tq.le_next; 771 LIST_REMOVE(nwp, nd_tq); 772 free((caddr_t)nwp, M_NFSRVDESC); 773 } 774 LIST_INIT(&slp->ns_tq); 775 crit_exit(); 776 } 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 if (--(slp->ns_sref) == 0 && (slp->ns_flag & SLP_VALID) == 0) { 787 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 788 free((caddr_t)slp, M_NFSSVC); 789 } 790 } 791 792 /* 793 * Lock a socket against others. 794 */ 795 int 796 nfs_slplock(struct nfssvc_sock *slp, int wait) 797 { 798 int *statep = &slp->ns_solock; 799 800 if (!wait && (*statep & NFSSTA_SNDLOCK)) 801 return(0); /* already locked, fail */ 802 while (*statep & NFSSTA_SNDLOCK) { 803 *statep |= NFSSTA_WANTSND; 804 (void) tsleep((caddr_t)statep, 0, "nfsslplck", 0); 805 } 806 *statep |= NFSSTA_SNDLOCK; 807 return (1); 808 } 809 810 /* 811 * Unlock the stream socket for others. 812 */ 813 void 814 nfs_slpunlock(struct nfssvc_sock *slp) 815 { 816 int *statep = &slp->ns_solock; 817 818 if ((*statep & NFSSTA_SNDLOCK) == 0) 819 panic("nfs slpunlock"); 820 *statep &= ~NFSSTA_SNDLOCK; 821 if (*statep & NFSSTA_WANTSND) { 822 *statep &= ~NFSSTA_WANTSND; 823 wakeup((caddr_t)statep); 824 } 825 } 826 827 /* 828 * Initialize the data structures for the server. 829 * Handshake with any new nfsds starting up to avoid any chance of 830 * corruption. 831 */ 832 void 833 nfsrv_init(int terminating) 834 { 835 struct nfssvc_sock *slp, *nslp; 836 837 if (nfssvc_sockhead_flag & SLP_INIT) 838 panic("nfsd init"); 839 nfssvc_sockhead_flag |= SLP_INIT; 840 if (terminating) { 841 TAILQ_FOREACH_MUTABLE(slp, &nfssvc_sockhead, ns_chain, nslp) { 842 if (slp->ns_flag & SLP_VALID) 843 nfsrv_zapsock(slp); 844 TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); 845 free((caddr_t)slp, M_NFSSVC); 846 } 847 nfsrv_cleancache(); /* And clear out server cache */ 848 } else 849 nfs_pub.np_valid = 0; 850 851 TAILQ_INIT(&nfssvc_sockhead); 852 nfssvc_sockhead_flag &= ~SLP_INIT; 853 if (nfssvc_sockhead_flag & SLP_WANTINIT) { 854 nfssvc_sockhead_flag &= ~SLP_WANTINIT; 855 wakeup((caddr_t)&nfssvc_sockhead); 856 } 857 858 TAILQ_INIT(&nfsd_head); 859 nfsd_head_flag &= ~NFSD_CHECKSLP; 860 861 #if 0 862 nfs_udpsock = (struct nfssvc_sock *) 863 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK); 864 bzero((caddr_t)nfs_udpsock, sizeof (struct nfssvc_sock)); 865 STAILQ_INIT(&nfs_udpsock->ns_rec); 866 TAILQ_INIT(&nfs_udpsock->ns_uidlruhead); 867 TAILQ_INSERT_HEAD(&nfssvc_sockhead, nfs_udpsock, ns_chain); 868 869 nfs_cltpsock = (struct nfssvc_sock *) 870 malloc(sizeof (struct nfssvc_sock), M_NFSSVC, M_WAITOK); 871 bzero((caddr_t)nfs_cltpsock, sizeof (struct nfssvc_sock)); 872 STAILQ_INIT(&nfs_cltpsock->ns_rec); 873 TAILQ_INIT(&nfs_cltpsock->ns_uidlruhead); 874 TAILQ_INSERT_TAIL(&nfssvc_sockhead, nfs_cltpsock, ns_chain); 875 #endif 876 } 877 878 /* 879 * Add entries to the server monitor log. 880 */ 881 static void 882 nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep) 883 { 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_NQNFS) 896 rt->flag |= DRT_NQNFS; 897 else if (nd->nd_flag & ND_NFSV3) 898 rt->flag |= DRT_NFSV3; 899 rt->proc = nd->nd_procnum; 900 if (nd->nd_nam->sa_family == AF_INET) 901 rt->ipadr = ((struct sockaddr_in *)nd->nd_nam)->sin_addr.s_addr; 902 else 903 rt->ipadr = INADDR_ANY; 904 rt->resptime = nfs_curusec() - (nd->nd_starttime.tv_sec * 1000000 + nd->nd_starttime.tv_usec); 905 getmicrotime(&rt->tstamp); 906 nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ; 907 } 908 #endif /* NFS_NOSERVER */ 909 910 static int nfs_defect = 0; 911 SYSCTL_INT(_vfs_nfs, OID_AUTO, defect, CTLFLAG_RW, &nfs_defect, 0, ""); 912 913 /* 914 * Asynchronous I/O daemons for client nfs. 915 * They do read-ahead and write-behind operations on the block I/O cache. 916 * Never returns unless it fails or gets killed. 917 */ 918 static int 919 nfssvc_iod(struct thread *td) 920 { 921 struct buf *bp; 922 int i, myiod; 923 struct nfsmount *nmp; 924 int error = 0; 925 926 /* 927 * Assign my position or return error if too many already running 928 */ 929 myiod = -1; 930 for (i = 0; i < NFS_MAXASYNCDAEMON; i++) 931 if (nfs_asyncdaemon[i] == 0) { 932 nfs_asyncdaemon[i]++; 933 myiod = i; 934 break; 935 } 936 if (myiod == -1) 937 return (EBUSY); 938 nfs_numasync++; 939 /* 940 * Just loop around doin our stuff until SIGKILL 941 */ 942 for (;;) { 943 while (((nmp = nfs_iodmount[myiod]) == NULL 944 || TAILQ_EMPTY(&nmp->nm_bufq)) 945 && error == 0) { 946 if (nmp) 947 nmp->nm_bufqiods--; 948 nfs_iodwant[myiod] = td; 949 nfs_iodmount[myiod] = NULL; 950 error = tsleep((caddr_t)&nfs_iodwant[myiod], 951 PCATCH, "nfsidl", 0); 952 } 953 if (error) { 954 nfs_asyncdaemon[myiod] = 0; 955 if (nmp) 956 nmp->nm_bufqiods--; 957 nfs_iodwant[myiod] = NULL; 958 nfs_iodmount[myiod] = NULL; 959 nfs_numasync--; 960 return (error); 961 } 962 while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) { 963 /* Take one off the front of the list */ 964 TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist); 965 nmp->nm_bufqlen--; 966 if (nmp->nm_bufqwant && nmp->nm_bufqlen <= nfs_numasync) { 967 nmp->nm_bufqwant = FALSE; 968 wakeup(&nmp->nm_bufq); 969 } 970 (void) nfs_doio(bp, NULL); 971 /* 972 * If there are more than one iod on this mount, then defect 973 * so that the iods can be shared out fairly between the mounts 974 */ 975 if (nfs_defect && nmp->nm_bufqiods > 1) { 976 NFS_DPF(ASYNCIO, 977 ("nfssvc_iod: iod %d defecting from mount %p\n", 978 myiod, nmp)); 979 nfs_iodmount[myiod] = NULL; 980 nmp->nm_bufqiods--; 981 break; 982 } 983 } 984 } 985 } 986 987 988 /* 989 * Get an authorization string for the uid by having the mount_nfs sitting 990 * on this mount point porpous out of the kernel and do it. 991 */ 992 int 993 nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep, 994 struct ucred *cred, char **auth_str, int *auth_len, char *verf_str, 995 int *verf_len, NFSKERBKEY_T key /* return session key */) 996 { 997 int error = 0; 998 999 while ((nmp->nm_state & NFSSTA_WAITAUTH) == 0) { 1000 nmp->nm_state |= NFSSTA_WANTAUTH; 1001 (void) tsleep((caddr_t)&nmp->nm_authtype, 0, 1002 "nfsauth1", 2 * hz); 1003 error = nfs_sigintr(nmp, rep, rep->r_td); 1004 if (error) { 1005 nmp->nm_state &= ~NFSSTA_WANTAUTH; 1006 return (error); 1007 } 1008 } 1009 nmp->nm_state &= ~(NFSSTA_WAITAUTH | NFSSTA_WANTAUTH); 1010 nmp->nm_authstr = *auth_str = (char *)malloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK); 1011 nmp->nm_authlen = RPCAUTH_MAXSIZ; 1012 nmp->nm_verfstr = verf_str; 1013 nmp->nm_verflen = *verf_len; 1014 nmp->nm_authuid = cred->cr_uid; 1015 wakeup((caddr_t)&nmp->nm_authstr); 1016 1017 /* 1018 * And wait for mount_nfs to do its stuff. 1019 */ 1020 while ((nmp->nm_state & NFSSTA_HASAUTH) == 0 && error == 0) { 1021 (void) tsleep((caddr_t)&nmp->nm_authlen, 0, 1022 "nfsauth2", 2 * hz); 1023 error = nfs_sigintr(nmp, rep, rep->r_td); 1024 } 1025 if (nmp->nm_state & NFSSTA_AUTHERR) { 1026 nmp->nm_state &= ~NFSSTA_AUTHERR; 1027 error = EAUTH; 1028 } 1029 if (error) 1030 free((caddr_t)*auth_str, M_TEMP); 1031 else { 1032 *auth_len = nmp->nm_authlen; 1033 *verf_len = nmp->nm_verflen; 1034 bcopy((caddr_t)nmp->nm_key, (caddr_t)key, sizeof (key)); 1035 } 1036 nmp->nm_state &= ~NFSSTA_HASAUTH; 1037 nmp->nm_state |= NFSSTA_WAITAUTH; 1038 if (nmp->nm_state & NFSSTA_WANTAUTH) { 1039 nmp->nm_state &= ~NFSSTA_WANTAUTH; 1040 wakeup((caddr_t)&nmp->nm_authtype); 1041 } 1042 return (error); 1043 } 1044 1045 /* 1046 * Get a nickname authenticator and verifier. 1047 */ 1048 int 1049 nfs_getnickauth(struct nfsmount *nmp, struct ucred *cred, char **auth_str, 1050 int *auth_len, char *verf_str, int verf_len) 1051 { 1052 struct nfsuid *nuidp; 1053 u_int32_t *nickp, *verfp; 1054 struct timeval ktvin, ktvout; 1055 1056 #ifdef DIAGNOSTIC 1057 if (verf_len < (4 * NFSX_UNSIGNED)) 1058 panic("nfs_getnickauth verf too small"); 1059 #endif 1060 for (nuidp = NMUIDHASH(nmp, cred->cr_uid)->lh_first; 1061 nuidp != 0; nuidp = nuidp->nu_hash.le_next) { 1062 if (nuidp->nu_cr.cr_uid == cred->cr_uid) 1063 break; 1064 } 1065 if (!nuidp || nuidp->nu_expire < time_second) 1066 return (EACCES); 1067 1068 /* 1069 * Move to the end of the lru list (end of lru == most recently used). 1070 */ 1071 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); 1072 TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru); 1073 1074 nickp = (u_int32_t *)malloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK); 1075 *nickp++ = txdr_unsigned(RPCAKN_NICKNAME); 1076 *nickp = txdr_unsigned(nuidp->nu_nickname); 1077 *auth_str = (char *)nickp; 1078 *auth_len = 2 * NFSX_UNSIGNED; 1079 1080 /* 1081 * Now we must encrypt the verifier and package it up. 1082 */ 1083 verfp = (u_int32_t *)verf_str; 1084 *verfp++ = txdr_unsigned(RPCAKN_NICKNAME); 1085 if (time_second > nuidp->nu_timestamp.tv_sec || 1086 (time_second == nuidp->nu_timestamp.tv_sec && 1087 time_second > nuidp->nu_timestamp.tv_usec)) 1088 getmicrotime(&nuidp->nu_timestamp); 1089 else 1090 nuidp->nu_timestamp.tv_usec++; 1091 ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec); 1092 ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec); 1093 1094 /* 1095 * Now encrypt the timestamp verifier in ecb mode using the session 1096 * key. 1097 */ 1098 #ifdef NFSKERB 1099 XXX 1100 #endif 1101 1102 *verfp++ = ktvout.tv_sec; 1103 *verfp++ = ktvout.tv_usec; 1104 *verfp = 0; 1105 return (0); 1106 } 1107 1108 /* 1109 * Save the current nickname in a hash list entry on the mount point. 1110 */ 1111 int 1112 nfs_savenickauth(struct nfsmount *nmp, struct ucred *cred, int len, 1113 NFSKERBKEY_T key, struct mbuf **mdp, char **dposp, 1114 struct mbuf *mrep) 1115 { 1116 struct nfsuid *nuidp; 1117 u_int32_t *tl; 1118 int32_t t1; 1119 struct mbuf *md = *mdp; 1120 struct timeval ktvin, ktvout; 1121 u_int32_t nick; 1122 char *dpos = *dposp, *cp2; 1123 int deltasec, error = 0; 1124 1125 if (len == (3 * NFSX_UNSIGNED)) { 1126 nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); 1127 ktvin.tv_sec = *tl++; 1128 ktvin.tv_usec = *tl++; 1129 nick = fxdr_unsigned(u_int32_t, *tl); 1130 1131 /* 1132 * Decrypt the timestamp in ecb mode. 1133 */ 1134 #ifdef NFSKERB 1135 XXX 1136 #endif 1137 ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec); 1138 ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec); 1139 deltasec = time_second - ktvout.tv_sec; 1140 if (deltasec < 0) 1141 deltasec = -deltasec; 1142 /* 1143 * If ok, add it to the hash list for the mount point. 1144 */ 1145 if (deltasec <= NFS_KERBCLOCKSKEW) { 1146 if (nmp->nm_numuids < nuidhash_max) { 1147 nmp->nm_numuids++; 1148 nuidp = (struct nfsuid *) 1149 malloc(sizeof (struct nfsuid), M_NFSUID, 1150 M_WAITOK); 1151 } else { 1152 nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); 1153 LIST_REMOVE(nuidp, nu_hash); 1154 TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, 1155 nu_lru); 1156 } 1157 nuidp->nu_flag = 0; 1158 nuidp->nu_cr.cr_uid = cred->cr_uid; 1159 nuidp->nu_expire = time_second + NFS_KERBTTL; 1160 nuidp->nu_timestamp = ktvout; 1161 nuidp->nu_nickname = nick; 1162 bcopy(key, nuidp->nu_key, sizeof (key)); 1163 TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, 1164 nu_lru); 1165 LIST_INSERT_HEAD(NMUIDHASH(nmp, cred->cr_uid), 1166 nuidp, nu_hash); 1167 } 1168 } else 1169 nfsm_adv(nfsm_rndup(len)); 1170 nfsmout: 1171 *mdp = md; 1172 *dposp = dpos; 1173 return (error); 1174 } 1175