nfs_boot.c revision 1.64.2.3
1 /* $NetBSD: nfs_boot.c,v 1.64.2.3 2007/08/20 21:28:10 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Adam Glass and Gordon W. Ross. 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Support for NFS diskless booting, specifically getting information 41 * about where to mount root from, what pathnames, etc. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: nfs_boot.c,v 1.64.2.3 2007/08/20 21:28:10 ad Exp $"); 46 47 #include "opt_nfs.h" 48 #include "opt_tftproot.h" 49 #include "opt_nfs_boot.h" 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/kernel.h> 54 #include <sys/device.h> 55 #include <sys/ioctl.h> 56 #include <sys/proc.h> 57 #include <sys/mount.h> 58 #include <sys/mbuf.h> 59 #include <sys/reboot.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 #include <net/if_ether.h> 66 #include <net/if_types.h> 67 68 #include <netinet/in.h> 69 #include <netinet/if_inarp.h> 70 71 #include <nfs/rpcv2.h> 72 #include <nfs/krpc.h> 73 #include <nfs/xdr_subs.h> 74 75 #include <nfs/nfsproto.h> 76 #include <nfs/nfs.h> 77 #include <nfs/nfsmount.h> 78 #include <nfs/nfsdiskless.h> 79 80 /* 81 * There are two implementations of NFS diskless boot. 82 * One implementation uses BOOTP (RFC951, RFC1048), 83 * the other uses Sun RPC/bootparams. See the files: 84 * nfs_bootp.c: BOOTP (RFC951, RFC1048) 85 * nfs_bootsun.c: Sun RPC/bootparams 86 */ 87 #if defined(NFS_BOOT_BOOTP) || defined(NFS_BOOT_DHCP) 88 int nfs_boot_rfc951 = 1; /* BOOTP enabled (default) */ 89 #endif 90 #ifdef NFS_BOOT_BOOTPARAM 91 int nfs_boot_bootparam = 1; /* BOOTPARAM enabled (default) */ 92 #endif 93 #ifdef NFS_BOOT_BOOTSTATIC 94 int nfs_boot_bootstatic = 1; /* BOOTSTATIC enabled (default) */ 95 #endif 96 97 /* mountd RPC */ 98 static int md_mount(struct sockaddr_in *mdsin, char *path, 99 struct nfs_args *argp, struct lwp *l); 100 101 static int nfs_boot_delroute(struct rtentry *, void *); 102 static void nfs_boot_defrt(struct in_addr *); 103 static int nfs_boot_getfh(struct nfs_dlmount *ndm, struct lwp *); 104 105 106 /* 107 * Called with an empty nfs_diskless struct to be filled in. 108 * Find an interface, determine its ip address (etc.) and 109 * save all the boot parameters in the nfs_diskless struct. 110 */ 111 int 112 nfs_boot_init(nd, lwp) 113 struct nfs_diskless *nd; 114 struct lwp *lwp; 115 { 116 struct ifnet *ifp; 117 int error = 0; 118 119 /* 120 * Find the network interface. 121 */ 122 ifp = ifunit(root_device->dv_xname); 123 if (ifp == NULL) { 124 printf("nfs_boot: '%s' not found\n", 125 root_device->dv_xname); 126 return (ENXIO); 127 } 128 nd->nd_ifp = ifp; 129 130 error = EADDRNOTAVAIL; /* ??? */ 131 #if defined(NFS_BOOT_BOOTSTATIC) 132 if (error && nfs_boot_bootstatic) { 133 printf("nfs_boot: trying static\n"); 134 error = nfs_bootstatic(nd, lwp); 135 } 136 #endif 137 #if defined(NFS_BOOT_BOOTP) || defined(NFS_BOOT_DHCP) 138 if (error && nfs_boot_rfc951) { 139 #if defined(NFS_BOOT_DHCP) 140 printf("nfs_boot: trying DHCP/BOOTP\n"); 141 #else 142 printf("nfs_boot: trying BOOTP\n"); 143 #endif 144 error = nfs_bootdhcp(nd, lwp); 145 } 146 #endif 147 #ifdef NFS_BOOT_BOOTPARAM 148 if (error && nfs_boot_bootparam) { 149 printf("nfs_boot: trying RARP (and RPC/bootparam)\n"); 150 error = nfs_bootparam(nd, lwp); 151 } 152 #endif 153 if (error) 154 return (error); 155 156 /* 157 * If the gateway address is set, add a default route. 158 * (The mountd RPCs may go across a gateway.) 159 */ 160 if (nd->nd_gwip.s_addr) 161 nfs_boot_defrt(&nd->nd_gwip); 162 163 #ifdef TFTPROOT 164 if (nd->nd_nomount) 165 goto out; 166 #endif 167 /* 168 * Now fetch the NFS file handles as appropriate. 169 */ 170 error = nfs_boot_getfh(&nd->nd_root, lwp); 171 172 if (error) 173 nfs_boot_cleanup(nd, lwp); 174 175 #ifdef TFTPROOT 176 out: 177 #endif 178 return (error); 179 } 180 181 void 182 nfs_boot_cleanup(nd, lwp) 183 struct nfs_diskless *nd; 184 struct lwp *lwp; 185 { 186 187 nfs_boot_deladdress(nd->nd_ifp, lwp, nd->nd_myip.s_addr); 188 nfs_boot_ifupdown(nd->nd_ifp, lwp, 0); 189 nfs_boot_flushrt(nd->nd_ifp); 190 } 191 192 int 193 nfs_boot_ifupdown(ifp, lwp, up) 194 struct ifnet *ifp; 195 struct lwp *lwp; 196 int up; 197 { 198 struct socket *so; 199 struct ifreq ireq; 200 int error; 201 202 memset(&ireq, 0, sizeof(ireq)); 203 memcpy(ireq.ifr_name, ifp->if_xname, IFNAMSIZ); 204 205 /* 206 * Get a socket to use for various things in here. 207 * After this, use "goto out" to cleanup and return. 208 */ 209 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp); 210 if (error) { 211 printf("ifupdown: socreate, error=%d\n", error); 212 return (error); 213 } 214 215 /* 216 * Bring up the interface. (just set the "up" flag) 217 * Get the old interface flags and or IFF_UP into them so 218 * things like media selection flags are not clobbered. 219 */ 220 error = ifioctl(so, SIOCGIFFLAGS, (void *)&ireq, lwp); 221 if (error) { 222 printf("ifupdown: GIFFLAGS, error=%d\n", error); 223 goto out; 224 } 225 if (up) 226 ireq.ifr_flags |= IFF_UP; 227 else 228 ireq.ifr_flags &= ~IFF_UP; 229 error = ifioctl(so, SIOCSIFFLAGS, (void *)&ireq, lwp); 230 if (error) { 231 printf("ifupdown: SIFFLAGS, error=%d\n", error); 232 goto out; 233 } 234 235 if (up) 236 /* give the link some time to get up */ 237 tsleep(nfs_boot_ifupdown, PZERO, "nfsbif", 3 * hz); 238 out: 239 soclose(so); 240 return (error); 241 } 242 243 int 244 nfs_boot_setaddress(ifp, lwp, addr, netmask, braddr) 245 struct ifnet *ifp; 246 struct lwp *lwp; 247 u_int32_t addr, netmask, braddr; 248 { 249 struct socket *so; 250 struct ifaliasreq iareq; 251 struct sockaddr_in *sin; 252 int error; 253 254 /* 255 * Get a socket to use for various things in here. 256 * After this, use "goto out" to cleanup and return. 257 */ 258 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp); 259 if (error) { 260 printf("setaddress: socreate, error=%d\n", error); 261 return (error); 262 } 263 264 memset(&iareq, 0, sizeof(iareq)); 265 memcpy(iareq.ifra_name, ifp->if_xname, IFNAMSIZ); 266 267 /* Set the I/F address */ 268 sin = (struct sockaddr_in *)&iareq.ifra_addr; 269 sin->sin_len = sizeof(*sin); 270 sin->sin_family = AF_INET; 271 sin->sin_addr.s_addr = addr; 272 273 /* Set the netmask */ 274 if (netmask != INADDR_ANY) { 275 sin = (struct sockaddr_in *)&iareq.ifra_mask; 276 sin->sin_len = sizeof(*sin); 277 sin->sin_family = AF_INET; 278 sin->sin_addr.s_addr = netmask; 279 } /* else leave subnetmask unspecified (len=0) */ 280 281 /* Set the broadcast addr. */ 282 if (braddr != INADDR_ANY) { 283 sin = (struct sockaddr_in *)&iareq.ifra_broadaddr; 284 sin->sin_len = sizeof(*sin); 285 sin->sin_family = AF_INET; 286 sin->sin_addr.s_addr = braddr; 287 } /* else leave broadcast addr unspecified (len=0) */ 288 289 error = ifioctl(so, SIOCAIFADDR, (void *)&iareq, lwp); 290 if (error) { 291 printf("setaddress, error=%d\n", error); 292 goto out; 293 } 294 295 /* give the link some time to get up */ 296 tsleep(nfs_boot_setaddress, PZERO, "nfsbtd", 3 * hz); 297 out: 298 soclose(so); 299 return (error); 300 } 301 302 int 303 nfs_boot_deladdress(ifp, lwp, addr) 304 struct ifnet *ifp; 305 struct lwp *lwp; 306 u_int32_t addr; 307 { 308 struct socket *so; 309 struct ifreq ireq; 310 struct sockaddr_in *sin; 311 int error; 312 313 /* 314 * Get a socket to use for various things in here. 315 * After this, use "goto out" to cleanup and return. 316 */ 317 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp); 318 if (error) { 319 printf("deladdress: socreate, error=%d\n", error); 320 return (error); 321 } 322 323 memset(&ireq, 0, sizeof(ireq)); 324 memcpy(ireq.ifr_name, ifp->if_xname, IFNAMSIZ); 325 326 sin = (struct sockaddr_in *)&ireq.ifr_addr; 327 sin->sin_len = sizeof(*sin); 328 sin->sin_family = AF_INET; 329 sin->sin_addr.s_addr = addr; 330 331 error = ifioctl(so, SIOCDIFADDR, (void *)&ireq, lwp); 332 if (error) { 333 printf("deladdress, error=%d\n", error); 334 goto out; 335 } 336 337 out: 338 soclose(so); 339 return (error); 340 } 341 342 int 343 nfs_boot_setrecvtimo(so) 344 struct socket *so; 345 { 346 struct mbuf *m; 347 struct timeval *tv; 348 349 m = m_get(M_WAIT, MT_SOOPTS); 350 tv = mtod(m, struct timeval *); 351 m->m_len = sizeof(*tv); 352 tv->tv_sec = 1; 353 tv->tv_usec = 0; 354 return (sosetopt(so, SOL_SOCKET, SO_RCVTIMEO, m)); 355 } 356 357 int 358 nfs_boot_enbroadcast(so) 359 struct socket *so; 360 { 361 struct mbuf *m; 362 int32_t *on; 363 364 m = m_get(M_WAIT, MT_SOOPTS); 365 on = mtod(m, int32_t *); 366 m->m_len = sizeof(*on); 367 *on = 1; 368 return (sosetopt(so, SOL_SOCKET, SO_BROADCAST, m)); 369 } 370 371 int 372 nfs_boot_sobind_ipport(so, port, l) 373 struct socket *so; 374 u_int16_t port; 375 struct lwp *l; 376 { 377 struct mbuf *m; 378 struct sockaddr_in *sin; 379 int error; 380 381 m = m_getclr(M_WAIT, MT_SONAME); 382 sin = mtod(m, struct sockaddr_in *); 383 sin->sin_len = m->m_len = sizeof(*sin); 384 sin->sin_family = AF_INET; 385 sin->sin_addr.s_addr = INADDR_ANY; 386 sin->sin_port = htons(port); 387 error = sobind(so, m, l); 388 m_freem(m); 389 return (error); 390 } 391 392 /* 393 * What is the longest we will wait before re-sending a request? 394 * Note this is also the frequency of "timeout" messages. 395 * The re-send loop counts up linearly to this maximum, so the 396 * first complaint will happen after (1+2+3+4+5)=15 seconds. 397 */ 398 #define MAX_RESEND_DELAY 5 /* seconds */ 399 #define TOTAL_TIMEOUT 30 /* seconds */ 400 401 int 402 nfs_boot_sendrecv(so, nam, sndproc, snd, rcvproc, rcv, from_p, context, lwp) 403 struct socket *so; 404 struct mbuf *nam; 405 int (*sndproc)(struct mbuf*, void*, int); 406 struct mbuf *snd; 407 int (*rcvproc)(struct mbuf*, void*); 408 struct mbuf **rcv, **from_p; 409 void *context; 410 struct lwp *lwp; 411 { 412 int error, rcvflg, timo, secs, waited; 413 struct mbuf *m, *from; 414 struct uio uio; 415 416 /* Free at end if not null. */ 417 from = NULL; 418 419 /* 420 * Send it, repeatedly, until a reply is received, 421 * but delay each re-send by an increasing amount. 422 * If the delay hits the maximum, start complaining. 423 */ 424 waited = timo = 0; 425 send_again: 426 waited += timo; 427 if (waited >= TOTAL_TIMEOUT) 428 return (ETIMEDOUT); 429 430 /* Determine new timeout. */ 431 if (timo < MAX_RESEND_DELAY) 432 timo++; 433 else 434 printf("nfs_boot: timeout...\n"); 435 436 if (sndproc) { 437 error = (*sndproc)(snd, context, waited); 438 if (error) 439 goto out; 440 } 441 442 /* Send request (or re-send). */ 443 m = m_copypacket(snd, M_WAIT); 444 if (m == NULL) { 445 error = ENOBUFS; 446 goto out; 447 } 448 error = (*so->so_send)(so, nam, NULL, m, NULL, 0, lwp); 449 if (error) { 450 printf("nfs_boot: sosend: %d\n", error); 451 goto out; 452 } 453 m = NULL; 454 455 /* 456 * Wait for up to timo seconds for a reply. 457 * The socket receive timeout was set to 1 second. 458 */ 459 460 secs = timo; 461 for (;;) { 462 if (from) { 463 m_freem(from); 464 from = NULL; 465 } 466 if (m) { 467 m_freem(m); 468 m = NULL; 469 } 470 uio.uio_resid = 1 << 16; /* ??? */ 471 rcvflg = 0; 472 error = (*so->so_receive)(so, &from, &uio, &m, NULL, &rcvflg); 473 if (error == EWOULDBLOCK) { 474 if (--secs <= 0) 475 goto send_again; 476 continue; 477 } 478 if (error) 479 goto out; 480 #ifdef DIAGNOSTIC 481 if (!m || !(m->m_flags & M_PKTHDR) 482 || (1 << 16) - uio.uio_resid != m->m_pkthdr.len) 483 panic("nfs_boot_sendrecv: return size"); 484 #endif 485 486 if ((*rcvproc)(m, context)) 487 continue; 488 489 if (rcv) 490 *rcv = m; 491 else 492 m_freem(m); 493 if (from_p) { 494 *from_p = from; 495 from = NULL; 496 } 497 break; 498 } 499 out: 500 if (from) m_freem(from); 501 return (error); 502 } 503 504 /* 505 * Install a default route to the passed IP address. 506 */ 507 static void 508 nfs_boot_defrt(gw_ip) 509 struct in_addr *gw_ip; 510 { 511 struct sockaddr dst, gw, mask; 512 struct sockaddr_in *sin; 513 int error; 514 515 /* Destination: (default) */ 516 memset((void *)&dst, 0, sizeof(dst)); 517 dst.sa_len = sizeof(dst); 518 dst.sa_family = AF_INET; 519 /* Gateway: */ 520 memset((void *)&gw, 0, sizeof(gw)); 521 sin = (struct sockaddr_in *)&gw; 522 sin->sin_len = sizeof(*sin); 523 sin->sin_family = AF_INET; 524 sin->sin_addr.s_addr = gw_ip->s_addr; 525 /* Mask: (zero length) */ 526 /* XXX - Just pass a null pointer? */ 527 memset(&mask, 0, sizeof(mask)); 528 529 /* add, dest, gw, mask, flags, 0 */ 530 error = rtrequest(RTM_ADD, &dst, &gw, &mask, 531 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL); 532 if (error) { 533 printf("nfs_boot: add route, error=%d\n", error); 534 error = 0; 535 } 536 } 537 538 static int 539 nfs_boot_delroute(struct rtentry *rt, void *w) 540 { 541 int error; 542 543 if ((void *)rt->rt_ifp != w) 544 return 0; 545 546 error = rtrequest(RTM_DELETE, rt_getkey(rt), NULL, rt_mask(rt), 0, 547 NULL); 548 if (error != 0) 549 printf("%s: del route, error=%d\n", __func__, error); 550 551 return 0; 552 } 553 554 void 555 nfs_boot_flushrt(struct ifnet *ifp) 556 { 557 558 rt_walktree(AF_INET, nfs_boot_delroute, ifp); 559 } 560 561 /* 562 * Get an initial NFS file handle using Sun RPC/mountd. 563 * Separate function because we used to call it twice. 564 * (once for root and once for swap) 565 */ 566 static int 567 nfs_boot_getfh(ndm, l) 568 struct nfs_dlmount *ndm; /* output */ 569 struct lwp *l; 570 { 571 struct nfs_args *args; 572 struct sockaddr_in *sin; 573 char *pathname; 574 int error; 575 u_int16_t port; 576 577 args = &ndm->ndm_args; 578 579 /* Initialize mount args. */ 580 memset((void *) args, 0, sizeof(*args)); 581 args->addr = &ndm->ndm_saddr; 582 args->addrlen = args->addr->sa_len; 583 #ifdef NFS_BOOT_TCP 584 args->sotype = SOCK_STREAM; 585 #else 586 args->sotype = SOCK_DGRAM; 587 #endif 588 args->fh = ndm->ndm_fh; 589 args->hostname = ndm->ndm_host; 590 args->flags = NFSMNT_NOCONN | NFSMNT_RESVPORT; 591 592 #ifndef NFS_V2_ONLY 593 args->flags |= NFSMNT_NFSV3; 594 #endif 595 #ifdef NFS_BOOT_OPTIONS 596 args->flags |= NFS_BOOT_OPTIONS; 597 #endif 598 #ifdef NFS_BOOT_RWSIZE 599 /* 600 * Reduce rsize,wsize for interfaces that consistently 601 * drop fragments of long UDP messages. (i.e. wd8003). 602 * You can always change these later via remount. 603 */ 604 args->flags |= NFSMNT_WSIZE | NFSMNT_RSIZE; 605 args->wsize = NFS_BOOT_RWSIZE; 606 args->rsize = NFS_BOOT_RWSIZE; 607 #endif 608 609 /* 610 * Find the pathname part of the "server:pathname" 611 * string left in ndm->ndm_host by nfs_boot_init. 612 */ 613 pathname = strchr(ndm->ndm_host, ':'); 614 if (pathname == 0) { 615 printf("nfs_boot: getfh - no pathname\n"); 616 return (EIO); 617 } 618 pathname++; 619 620 /* 621 * Get file handle using RPC to mountd/mount 622 */ 623 sin = (struct sockaddr_in *)&ndm->ndm_saddr; 624 error = md_mount(sin, pathname, args, l); 625 if (error) { 626 printf("nfs_boot: mountd `%s', error=%d\n", 627 ndm->ndm_host, error); 628 return (error); 629 } 630 631 /* Set port number for NFS use. */ 632 /* XXX: NFS port is always 2049, right? */ 633 #ifdef NFS_BOOT_TCP 634 retry: 635 #endif 636 error = krpc_portmap(sin, NFS_PROG, 637 (args->flags & NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 638 (args->sotype == SOCK_STREAM) ? IPPROTO_TCP : IPPROTO_UDP, 639 &port, l); 640 if (port == htons(0)) 641 error = EIO; 642 if (error) { 643 #ifdef NFS_BOOT_TCP 644 if (args->sotype == SOCK_STREAM) { 645 args->sotype = SOCK_DGRAM; 646 goto retry; 647 } 648 #endif 649 printf("nfs_boot: portmap NFS, error=%d\n", error); 650 return (error); 651 } 652 sin->sin_port = port; 653 return (0); 654 } 655 656 657 /* 658 * RPC: mountd/mount 659 * Given a server pathname, get an NFS file handle. 660 * Also, sets sin->sin_port to the NFS service port. 661 */ 662 static int 663 md_mount(mdsin, path, argp, lwp) 664 struct sockaddr_in *mdsin; /* mountd server address */ 665 char *path; 666 struct nfs_args *argp; 667 struct lwp *lwp; 668 { 669 /* The RPC structures */ 670 struct rdata { 671 u_int32_t errno; 672 union { 673 u_int8_t v2fh[NFSX_V2FH]; 674 struct { 675 u_int32_t fhlen; 676 u_int8_t fh[1]; 677 } v3fh; 678 } fh; 679 } *rdata; 680 struct mbuf *m; 681 u_int8_t *fh; 682 int minlen, error; 683 int mntver; 684 685 mntver = (argp->flags & NFSMNT_NFSV3) ? 3 : 2; 686 do { 687 /* 688 * Get port number for MOUNTD. 689 */ 690 error = krpc_portmap(mdsin, RPCPROG_MNT, mntver, 691 IPPROTO_UDP, &mdsin->sin_port, lwp); 692 if (error) 693 continue; 694 695 /* This mbuf is consumed by krpc_call. */ 696 m = xdr_string_encode(path, strlen(path)); 697 if (m == NULL) 698 return ENOMEM; 699 700 /* Do RPC to mountd. */ 701 error = krpc_call(mdsin, RPCPROG_MNT, mntver, 702 RPCMNT_MOUNT, &m, NULL, lwp); 703 if (error != EPROGMISMATCH) 704 break; 705 /* Try lower version of mountd. */ 706 } while (--mntver >= 1); 707 if (error) { 708 printf("nfs_boot: mountd error=%d\n", error); 709 return error; 710 } 711 if (mntver != 3) 712 argp->flags &= ~NFSMNT_NFSV3; 713 714 /* The reply might have only the errno. */ 715 if (m->m_len < 4) 716 goto bad; 717 /* Have at least errno, so check that. */ 718 rdata = mtod(m, struct rdata *); 719 error = fxdr_unsigned(u_int32_t, rdata->errno); 720 if (error) 721 goto out; 722 723 /* Have errno==0, so the fh must be there. */ 724 if (mntver == 3) { 725 argp->fhsize = fxdr_unsigned(u_int32_t, rdata->fh.v3fh.fhlen); 726 if (argp->fhsize > NFSX_V3FHMAX) 727 goto bad; 728 minlen = 2 * sizeof(u_int32_t) + argp->fhsize; 729 } else { 730 argp->fhsize = NFSX_V2FH; 731 minlen = sizeof(u_int32_t) + argp->fhsize; 732 } 733 734 if (m->m_len < minlen) { 735 m = m_pullup(m, minlen); 736 if (m == NULL) 737 return(EBADRPC); 738 rdata = mtod(m, struct rdata *); 739 } 740 741 fh = (mntver == 3) ? 742 rdata->fh.v3fh.fh : rdata->fh.v2fh; 743 memcpy(argp->fh, fh, argp->fhsize); 744 745 goto out; 746 747 bad: 748 error = EBADRPC; 749 750 out: 751 m_freem(m); 752 return error; 753 } 754
Indexes created Tue Sep 30 20:09:53 GMT 2025