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sys/nfs/nfs_bootdhcp.c
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1 /* $NetBSD: nfs_bootdhcp.c,v 1.28 2005/02/26 22:39:50 perry 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 with BOOTP (RFC951, RFC1048) 41 * 42 * History: 43 * 44 * Tor Egge developed the initial version of this code based on 45 * the Sun RPC/bootparam sources nfs_boot.c and krpc_subr.c and 46 * submitted that work to NetBSD as bugreport "kern/2351" on 47 * 29 Apr 1996. 48 * 49 * Gordon Ross reorganized Tor's version into this form and 50 * integrated it into the NetBSD sources during Aug 1997. 51 */ 52 53 #include <sys/cdefs.h> 54 __KERNEL_RCSID(0, "$NetBSD: nfs_bootdhcp.c,v 1.28 2005/02/26 22:39:50 perry Exp $"); 55 56 #include "opt_nfs_boot.h" 57 58 #include <sys/param.h> 59 #include <sys/systm.h> 60 #include <sys/kernel.h> 61 #include <sys/device.h> 62 #include <sys/ioctl.h> 63 #include <sys/proc.h> 64 #include <sys/mount.h> 65 #include <sys/mbuf.h> 66 #include <sys/reboot.h> 67 #include <sys/socket.h> 68 #include <sys/socketvar.h> 69 70 #include <net/if.h> 71 #include <net/if_types.h> 72 #include <net/if_arp.h> /* ARPHRD_ETHER, etc. */ 73 #include <net/if_dl.h> 74 #include <net/if_ether.h> 75 #include <net/route.h> 76 77 #include <netinet/in.h> 78 #include <netinet/if_inarp.h> 79 80 #include <nfs/rpcv2.h> 81 82 #include <nfs/nfsproto.h> 83 #include <nfs/nfs.h> 84 #include <nfs/nfsmount.h> 85 #include <nfs/nfsdiskless.h> 86 87 /* 88 * There are two implementations of NFS diskless boot. 89 * This implementation uses BOOTP (RFC951, RFC1048), and 90 * the other uses Sun RPC/bootparams (nfs_bootparam.c). 91 * 92 * This method gets everything it needs with one BOOTP 93 * request and reply. Note that this actually uses only 94 * the old BOOTP functionality subset of DHCP. It is not 95 * clear that DHCP provides any advantage over BOOTP for 96 * diskless boot. DHCP allows the server to assign an IP 97 * address without any a-priori knowledge of the client, 98 * but we require that the server has a-priori knowledge 99 * of the client so it can export our (unique) NFS root. 100 * Given that the server needs a-priori knowledge about 101 * the client anyway, it might as well assign a fixed IP 102 * address for the client and support BOOTP. 103 * 104 * On the other hand, disk-FULL clients may use DHCP, but 105 * in that case the DHCP client should be user-mode code, 106 * and has no bearing on the code below. -gwr 107 */ 108 109 /* Begin stuff from bootp.h */ 110 /* Definitions from RFC951 */ 111 #define BP_CHADDR_LEN 16 112 #define BP_SNAME_LEN 64 113 #define BP_FILE_LEN 128 114 #define BP_VEND_LEN 64 115 struct bootp { 116 u_int8_t bp_op; /* packet opcode type */ 117 u_int8_t bp_htype; /* hardware addr type */ 118 u_int8_t bp_hlen; /* hardware addr length */ 119 u_int8_t bp_hops; /* gateway hops */ 120 u_int32_t bp_xid; /* transaction ID */ 121 u_int16_t bp_secs; /* seconds since boot began */ 122 u_int16_t bp_flags; /* RFC1532 broadcast, etc. */ 123 struct in_addr bp_ciaddr; /* client IP address */ 124 struct in_addr bp_yiaddr; /* 'your' IP address */ 125 struct in_addr bp_siaddr; /* server IP address */ 126 struct in_addr bp_giaddr; /* gateway IP address */ 127 u_int8_t bp_chaddr[BP_CHADDR_LEN]; /* client hardware address */ 128 char bp_sname[BP_SNAME_LEN]; /* server host name */ 129 char bp_file[BP_FILE_LEN]; /* boot file name */ 130 u_int8_t bp_vend[BP_VEND_LEN]; /* RFC1048 options */ 131 /* 132 * Note that BOOTP packets are allowed to be longer 133 * (see RFC 1532 sect. 2.1) and common practice is to 134 * allow the option data in bp_vend to extend into the 135 * additional space provided in longer packets. 136 */ 137 }; 138 139 #define IPPORT_BOOTPS 67 140 #define IPPORT_BOOTPC 68 141 142 #define BOOTREQUEST 1 143 #define BOOTREPLY 2 144 145 /* 146 * Is this available from the sockaddr_dl somehow? 147 * Perhaps (struct arphdr)->ar_hrd = ARPHRD_ETHER? 148 * The interface has ->if_type but not the ARP fmt. 149 */ 150 #define HTYPE_ETHERNET 1 151 #define HTYPE_IEEE802 6 152 153 /* 154 * Vendor magic cookie (v_magic) for RFC1048 155 */ 156 static const u_int8_t vm_rfc1048[4] = { 99, 130, 83, 99 }; 157 158 /* 159 * Tag values used to specify what information is being supplied in 160 * the vendor (options) data area of the packet. 161 */ 162 /* RFC 1048 */ 163 #define TAG_END ((unsigned char) 255) 164 #define TAG_PAD ((unsigned char) 0) 165 #define TAG_SUBNET_MASK ((unsigned char) 1) 166 #define TAG_TIME_OFFSET ((unsigned char) 2) 167 #define TAG_GATEWAY ((unsigned char) 3) 168 #define TAG_TIME_SERVER ((unsigned char) 4) 169 #define TAG_NAME_SERVER ((unsigned char) 5) 170 #define TAG_DOMAIN_SERVER ((unsigned char) 6) 171 #define TAG_LOG_SERVER ((unsigned char) 7) 172 #define TAG_COOKIE_SERVER ((unsigned char) 8) 173 #define TAG_LPR_SERVER ((unsigned char) 9) 174 #define TAG_IMPRESS_SERVER ((unsigned char) 10) 175 #define TAG_RLP_SERVER ((unsigned char) 11) 176 #define TAG_HOST_NAME ((unsigned char) 12) 177 #define TAG_BOOT_SIZE ((unsigned char) 13) 178 /* RFC 1395 */ 179 #define TAG_DUMP_FILE ((unsigned char) 14) 180 #define TAG_DOMAIN_NAME ((unsigned char) 15) 181 #define TAG_SWAP_SERVER ((unsigned char) 16) 182 #define TAG_ROOT_PATH ((unsigned char) 17) 183 /* End of stuff from bootp.h */ 184 185 #ifdef NFS_BOOT_DHCP 186 #define TAG_REQ_ADDR ((unsigned char) 50) 187 #define TAG_LEASETIME ((unsigned char) 51) 188 #define TAG_OVERLOAD ((unsigned char) 52) 189 #define TAG_DHCP_MSGTYPE ((unsigned char) 53) 190 #define TAG_SERVERID ((unsigned char) 54) 191 #define TAG_PARAM_REQ ((unsigned char) 55) 192 #define TAG_MSG ((unsigned char) 56) 193 #define TAG_MAXSIZE ((unsigned char) 57) 194 #define TAG_T1 ((unsigned char) 58) 195 #define TAG_T2 ((unsigned char) 59) 196 #define TAG_CLASSID ((unsigned char) 60) 197 #define TAG_CLIENTID ((unsigned char) 61) 198 #endif 199 200 #ifdef NFS_BOOT_DHCP 201 #define DHCPDISCOVER 1 202 #define DHCPOFFER 2 203 #define DHCPREQUEST 3 204 #define DHCPDECLINE 4 205 #define DHCPACK 5 206 #define DHCPNAK 6 207 #define DHCPRELEASE 7 208 #endif 209 210 #ifdef NFS_BOOT_DHCP 211 #define BOOTP_SIZE_MAX (sizeof(struct bootp)+312-64) 212 #else 213 /* 214 * The "extended" size is somewhat arbitrary, but is 215 * constrained by the maximum message size specified 216 * by RFC1533 (567 total). This value increases the 217 * space for options from 64 bytes to 256 bytes. 218 */ 219 #define BOOTP_SIZE_MAX (sizeof(struct bootp)+256-64) 220 #endif 221 #define BOOTP_SIZE_MIN (sizeof(struct bootp)) 222 223 /* Convenience macro */ 224 #define INTOHL(ina) ((u_int32_t)ntohl((ina).s_addr)) 225 226 static int bootpc_call __P((struct nfs_diskless *, struct proc *)); 227 static void bootp_extract __P((struct bootp *, int, struct nfs_diskless *)); 228 229 /* #define DEBUG XXX */ 230 231 #ifdef DEBUG 232 #define DPRINT(s) printf("nfs_boot: %s\n", s) 233 #else 234 #define DPRINT(s) (void)0 235 #endif 236 237 238 /* 239 * Get our boot parameters using BOOTP. 240 */ 241 int 242 nfs_bootdhcp(nd, procp) 243 struct nfs_diskless *nd; 244 struct proc *procp; 245 { 246 struct ifnet *ifp = nd->nd_ifp; 247 int error; 248 249 /* 250 * Do enough of ifconfig(8) so that the chosen interface 251 * can talk to the servers. Use address zero for now. 252 */ 253 error = nfs_boot_setaddress(ifp, procp, INADDR_ANY, INADDR_ANY, 254 INADDR_BROADCAST); 255 if (error) { 256 printf("nfs_boot: set ifaddr zero, error=%d\n", error); 257 return (error); 258 } 259 260 /* This function call does the real send/recv work. */ 261 error = bootpc_call(nd, procp); 262 263 /* Get rid of the temporary (zero) IP address. */ 264 (void) nfs_boot_deladdress(ifp, procp, INADDR_ANY); 265 266 /* NOW we can test the error from bootpc_call. */ 267 if (error) 268 goto out; 269 270 /* 271 * Do ifconfig with our real IP address and mask. 272 */ 273 error = nfs_boot_setaddress(ifp, procp, nd->nd_myip.s_addr, 274 nd->nd_mask.s_addr, INADDR_ANY); 275 if (error) { 276 printf("nfs_boot: set ifaddr real, error=%d\n", error); 277 goto out; 278 } 279 280 out: 281 if (error) { 282 (void) nfs_boot_ifupdown(ifp, procp, 0); 283 nfs_boot_flushrt(ifp); 284 } 285 return (error); 286 } 287 288 struct bootpcontext { 289 int xid; 290 u_char *haddr; 291 u_char halen; 292 struct bootp *replybuf; 293 int replylen; 294 #ifdef NFS_BOOT_DHCP 295 char expected_dhcpmsgtype, dhcp_ok; 296 struct in_addr dhcp_serverip; 297 #endif 298 }; 299 300 static int bootpset __P((struct mbuf*, void*, int)); 301 static int bootpcheck __P((struct mbuf*, void*)); 302 303 static int 304 bootpset(m, context, waited) 305 struct mbuf *m; 306 void *context; 307 int waited; 308 { 309 struct bootp *bootp; 310 311 /* we know it's contigous (in 1 mbuf cluster) */ 312 bootp = mtod(m, struct bootp*); 313 314 bootp->bp_secs = htons(waited); 315 316 return (0); 317 } 318 319 static int 320 bootpcheck(m, context) 321 struct mbuf *m; 322 void *context; 323 { 324 struct bootp *bootp; 325 struct bootpcontext *bpc = context; 326 u_int tag, len; 327 u_char *p, *limit; 328 329 /* 330 * Is this a valid reply? 331 */ 332 if (m->m_pkthdr.len < BOOTP_SIZE_MIN) { 333 DPRINT("short packet"); 334 return (-1); 335 } 336 if (m->m_pkthdr.len > BOOTP_SIZE_MAX) { 337 DPRINT("long packet"); 338 return (-1); 339 } 340 341 /* 342 * don't make first checks more expensive than necessary 343 */ 344 if (m->m_len < offsetof(struct bootp, bp_sname)) { 345 m = m_pullup(m, offsetof(struct bootp, bp_sname)); 346 if (m == NULL) 347 return (-1); 348 } 349 bootp = mtod(m, struct bootp*); 350 351 if (bootp->bp_op != BOOTREPLY) { 352 DPRINT("not reply"); 353 return (-1); 354 } 355 if (bootp->bp_hlen != bpc->halen) { 356 DPRINT("bad hwa_len"); 357 return (-1); 358 } 359 if (memcmp(bootp->bp_chaddr, bpc->haddr, bpc->halen)) { 360 DPRINT("wrong hwaddr"); 361 return (-1); 362 } 363 if (bootp->bp_xid != bpc->xid) { 364 DPRINT("wrong xid"); 365 return (-1); 366 } 367 368 /* 369 * OK, it's worth to look deeper. 370 * We copy the mbuf into a flat buffer here because 371 * m_pullup() is a bit limited for this purpose 372 * (doesn't allocate a cluster if necessary). 373 */ 374 bpc->replylen = m->m_pkthdr.len; 375 m_copydata(m, 0, bpc->replylen, (caddr_t)bpc->replybuf); 376 bootp = bpc->replybuf; 377 378 /* 379 * Check if the IP address we get looks correct. 380 * (DHCP servers can send junk to unknown clients.) 381 * XXX more checks might be needed 382 */ 383 if (bootp->bp_yiaddr.s_addr == INADDR_ANY || 384 bootp->bp_yiaddr.s_addr == INADDR_BROADCAST) { 385 printf("nfs_boot: wrong IP addr %s", 386 inet_ntoa(bootp->bp_yiaddr)); 387 goto warn; 388 } 389 390 /* 391 * Check the vendor data. 392 */ 393 if (memcmp(bootp->bp_vend, vm_rfc1048, 4)) { 394 printf("nfs_boot: reply missing options"); 395 goto warn; 396 } 397 p = &bootp->bp_vend[4]; 398 limit = ((char*)bootp) + bpc->replylen; 399 while (p < limit) { 400 tag = *p++; 401 if (tag == TAG_END) 402 break; 403 if (tag == TAG_PAD) 404 continue; 405 len = *p++; 406 if ((p + len) > limit) { 407 printf("nfs_boot: option %d too long", tag); 408 goto warn; 409 } 410 switch (tag) { 411 #ifdef NFS_BOOT_DHCP 412 case TAG_DHCP_MSGTYPE: 413 if (*p != bpc->expected_dhcpmsgtype) 414 return (-1); 415 bpc->dhcp_ok = 1; 416 break; 417 case TAG_SERVERID: 418 memcpy(&bpc->dhcp_serverip.s_addr, p, 419 sizeof(bpc->dhcp_serverip.s_addr)); 420 break; 421 #endif 422 default: 423 break; 424 } 425 p += len; 426 } 427 return (0); 428 429 warn: 430 printf(" (bad reply from %s)\n", inet_ntoa(bootp->bp_siaddr)); 431 return (-1); 432 } 433 434 static int 435 bootpc_call(nd, procp) 436 struct nfs_diskless *nd; 437 struct proc *procp; 438 { 439 struct socket *so; 440 struct ifnet *ifp = nd->nd_ifp; 441 static u_int32_t xid = ~0xFF; 442 struct bootp *bootp; /* request */ 443 struct mbuf *m, *nam; 444 struct sockaddr_in *sin; 445 int error; 446 u_char *haddr; 447 u_char hafmt, halen; 448 struct bootpcontext bpc; 449 #ifdef NFS_BOOT_DHCP 450 char vci[64]; 451 int vcilen; 452 #endif 453 454 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, procp); 455 if (error) { 456 printf("bootp: socreate, error=%d\n", error); 457 return (error); 458 } 459 460 /* 461 * Initialize to NULL anything that will hold an allocation, 462 * and free each at the end if not null. 463 */ 464 bpc.replybuf = NULL; 465 m = nam = NULL; 466 467 /* Record our H/W (Ethernet) address. */ 468 { struct sockaddr_dl *sdl = ifp->if_sadl; 469 switch (sdl->sdl_type) { 470 case IFT_ISO88025: 471 hafmt = HTYPE_IEEE802; 472 break; 473 case IFT_ETHER: 474 case IFT_FDDI: 475 hafmt = HTYPE_ETHERNET; 476 break; 477 default: 478 printf("bootp: unsupported interface type %d\n", 479 sdl->sdl_type); 480 error = EINVAL; 481 goto out; 482 } 483 halen = sdl->sdl_alen; 484 haddr = (unsigned char *)LLADDR(sdl); 485 } 486 487 /* 488 * Skip the route table when sending on this socket. 489 * If this is not done, ip_output finds the loopback 490 * interface (why?) and then fails because broadcast 491 * is not supported on that interface... 492 */ 493 { int32_t *opt; 494 m = m_get(M_WAIT, MT_SOOPTS); 495 opt = mtod(m, int32_t *); 496 m->m_len = sizeof(*opt); 497 *opt = 1; 498 error = sosetopt(so, SOL_SOCKET, SO_DONTROUTE, m); 499 m = NULL; /* was consumed */ 500 } 501 if (error) { 502 DPRINT("SO_DONTROUTE"); 503 goto out; 504 } 505 506 /* Enable broadcast. */ 507 if ((error = nfs_boot_enbroadcast(so))) { 508 DPRINT("SO_BROADCAST"); 509 goto out; 510 } 511 512 /* 513 * Set some TTL so we can boot through routers. 514 * Real BOOTP forwarding agents don't need this; they obey "bp_hops" 515 * and set "bp_giaddr", thus rewrite the packet anyway. 516 * The "helper-address" feature of some popular router vendor seems 517 * to do simple IP forwarding and drops packets with (ip_ttl == 1). 518 */ 519 { u_char *opt; 520 m = m_get(M_WAIT, MT_SOOPTS); 521 opt = mtod(m, u_char *); 522 m->m_len = sizeof(*opt); 523 *opt = 7; 524 error = sosetopt(so, IPPROTO_IP, IP_MULTICAST_TTL, m); 525 m = NULL; /* was consumed */ 526 } 527 if (error) { 528 DPRINT("IP_MULTICAST_TTL"); 529 goto out; 530 } 531 532 /* Set the receive timeout for the socket. */ 533 if ((error = nfs_boot_setrecvtimo(so))) { 534 DPRINT("SO_RCVTIMEO"); 535 goto out; 536 } 537 538 /* 539 * Bind the local endpoint to a bootp client port. 540 */ 541 if ((error = nfs_boot_sobind_ipport(so, IPPORT_BOOTPC, procp))) { 542 DPRINT("bind failed\n"); 543 goto out; 544 } 545 546 /* 547 * Setup socket address for the server. 548 */ 549 nam = m_get(M_WAIT, MT_SONAME); 550 sin = mtod(nam, struct sockaddr_in *); 551 sin->sin_len = nam->m_len = sizeof(*sin); 552 sin->sin_family = AF_INET; 553 sin->sin_addr.s_addr = INADDR_BROADCAST; 554 sin->sin_port = htons(IPPORT_BOOTPS); 555 556 /* 557 * Allocate buffer used for request 558 */ 559 m = m_gethdr(M_WAIT, MT_DATA); 560 m_clget(m, M_WAIT); 561 bootp = mtod(m, struct bootp*); 562 m->m_pkthdr.len = m->m_len = BOOTP_SIZE_MAX; 563 m->m_pkthdr.rcvif = NULL; 564 565 /* 566 * Build the BOOTP reqest message. 567 * Note: xid is host order! (opaque to server) 568 */ 569 memset((caddr_t)bootp, 0, BOOTP_SIZE_MAX); 570 bootp->bp_op = BOOTREQUEST; 571 bootp->bp_htype = hafmt; 572 bootp->bp_hlen = halen; /* Hardware address length */ 573 bootp->bp_xid = ++xid; 574 memcpy(bootp->bp_chaddr, haddr, halen); 575 #ifdef NFS_BOOT_BOOTP_REQFILE 576 strncpy(bootp->bp_file, NFS_BOOT_BOOTP_REQFILE, sizeof(bootp->bp_file)); 577 #endif 578 /* Fill-in the vendor data. */ 579 memcpy(bootp->bp_vend, vm_rfc1048, 4); 580 #ifdef NFS_BOOT_DHCP 581 bootp->bp_vend[4] = TAG_DHCP_MSGTYPE; 582 bootp->bp_vend[5] = 1; 583 bootp->bp_vend[6] = DHCPDISCOVER; 584 /* 585 * Insert a NetBSD Vendor Class Identifier option. 586 */ 587 snprintf(vci, sizeof(vci), "%s:%s:kernel:%s", ostype, MACHINE, 588 osrelease); 589 vcilen = strlen(vci); 590 bootp->bp_vend[7] = TAG_CLASSID; 591 bootp->bp_vend[8] = vcilen; 592 memcpy(&bootp->bp_vend[9], vci, vcilen); 593 bootp->bp_vend[9 + vcilen] = TAG_END; 594 #else 595 bootp->bp_vend[4] = TAG_END; 596 #endif 597 598 bpc.xid = xid; 599 bpc.haddr = haddr; 600 bpc.halen = halen; 601 bpc.replybuf = malloc(BOOTP_SIZE_MAX, M_DEVBUF, M_WAITOK); 602 if (bpc.replybuf == NULL) 603 panic("nfs_boot: malloc reply buf"); 604 #ifdef NFS_BOOT_DHCP 605 bpc.expected_dhcpmsgtype = DHCPOFFER; 606 bpc.dhcp_ok = 0; 607 #endif 608 609 error = nfs_boot_sendrecv(so, nam, bootpset, m, 610 bootpcheck, 0, 0, &bpc, procp); 611 if (error) 612 goto out; 613 614 #ifdef NFS_BOOT_DHCP 615 if (bpc.dhcp_ok) { 616 u_int32_t leasetime; 617 bootp->bp_vend[6] = DHCPREQUEST; 618 bootp->bp_vend[7] = TAG_REQ_ADDR; 619 bootp->bp_vend[8] = 4; 620 memcpy(&bootp->bp_vend[9], &bpc.replybuf->bp_yiaddr, 4); 621 bootp->bp_vend[13] = TAG_SERVERID; 622 bootp->bp_vend[14] = 4; 623 memcpy(&bootp->bp_vend[15], &bpc.dhcp_serverip.s_addr, 4); 624 bootp->bp_vend[19] = TAG_LEASETIME; 625 bootp->bp_vend[20] = 4; 626 leasetime = htonl(300); 627 memcpy(&bootp->bp_vend[21], &leasetime, 4); 628 bootp->bp_vend[25] = TAG_CLASSID; 629 bootp->bp_vend[26] = vcilen; 630 memcpy(&bootp->bp_vend[27], vci, vcilen); 631 bootp->bp_vend[27 + vcilen] = TAG_END; 632 633 bpc.expected_dhcpmsgtype = DHCPACK; 634 635 error = nfs_boot_sendrecv(so, nam, bootpset, m, 636 bootpcheck, 0, 0, &bpc, procp); 637 if (error) 638 goto out; 639 } 640 #endif 641 642 /* 643 * bootpcheck() has copied the receive mbuf into 644 * the buffer at bpc.replybuf. 645 */ 646 #ifdef NFS_BOOT_DHCP 647 printf("nfs_boot: %s next-server: %s\n", 648 (bpc.dhcp_ok ? "DHCP" : "BOOTP"), 649 #else 650 printf("nfs_boot: BOOTP next-server: %s\n", 651 #endif 652 inet_ntoa(bpc.replybuf->bp_siaddr)); 653 654 bootp_extract(bpc.replybuf, bpc.replylen, nd); 655 656 out: 657 if (bpc.replybuf) 658 free(bpc.replybuf, M_DEVBUF); 659 if (m) 660 m_freem(m); 661 if (nam) 662 m_freem(nam); 663 soclose(so); 664 return (error); 665 } 666 667 static void 668 bootp_extract(bootp, replylen, nd) 669 struct bootp *bootp; 670 int replylen; 671 struct nfs_diskless *nd; 672 { 673 struct sockaddr_in *sin; 674 struct in_addr netmask; 675 struct in_addr gateway; 676 struct in_addr rootserver; 677 char *myname; /* my hostname */ 678 char *mydomain; /* my domainname */ 679 char *rootpath; 680 int mynamelen; 681 int mydomainlen; 682 int rootpathlen; 683 int overloaded; 684 u_int tag, len; 685 u_char *p, *limit; 686 687 /* Default these to "unspecified". */ 688 netmask.s_addr = 0; 689 gateway.s_addr = 0; 690 mydomain = myname = rootpath = NULL; 691 mydomainlen = mynamelen = rootpathlen = 0; 692 /* default root server to bootp next-server */ 693 rootserver = bootp->bp_siaddr; 694 /* assume that server name field is not overloaded by default */ 695 overloaded = 0; 696 697 p = &bootp->bp_vend[4]; 698 limit = ((char*)bootp) + replylen; 699 while (p < limit) { 700 tag = *p++; 701 if (tag == TAG_END) 702 break; 703 if (tag == TAG_PAD) 704 continue; 705 len = *p++; 706 #if 0 /* already done in bootpcheck() */ 707 if ((p + len) > limit) { 708 printf("nfs_boot: option %d too long\n", tag); 709 break; 710 } 711 #endif 712 switch (tag) { 713 case TAG_SUBNET_MASK: 714 memcpy(&netmask, p, 4); 715 break; 716 case TAG_GATEWAY: 717 /* Routers */ 718 memcpy(&gateway, p, 4); 719 break; 720 case TAG_HOST_NAME: 721 if (len >= sizeof(hostname)) { 722 printf("nfs_boot: host name >= %lu bytes", 723 (u_long)sizeof(hostname)); 724 break; 725 } 726 myname = p; 727 mynamelen = len; 728 break; 729 case TAG_DOMAIN_NAME: 730 if (len >= sizeof(domainname)) { 731 printf("nfs_boot: domain name >= %lu bytes", 732 (u_long)sizeof(domainname)); 733 break; 734 } 735 mydomain = p; 736 mydomainlen = len; 737 break; 738 case TAG_ROOT_PATH: 739 /* Leave some room for the server name. */ 740 if (len >= (MNAMELEN-10)) { 741 printf("nfs_boot: rootpath >=%d bytes", 742 (MNAMELEN-10)); 743 break; 744 } 745 rootpath = p; 746 rootpathlen = len; 747 break; 748 case TAG_SWAP_SERVER: 749 /* override NFS server address */ 750 memcpy(&rootserver, p, 4); 751 break; 752 #ifdef NFS_BOOT_DHCP 753 case TAG_OVERLOAD: 754 if (len > 0 && ((*p & 0x02) != 0)) 755 /* 756 * The server name field in the dhcp packet 757 * is overloaded and we can't find server 758 * name there. 759 */ 760 overloaded = 1; 761 break; 762 #endif 763 default: 764 break; 765 } 766 p += len; 767 } 768 769 /* 770 * Store and print network config info. 771 */ 772 if (myname) { 773 myname[mynamelen] = '\0'; 774 strncpy(hostname, myname, sizeof(hostname)); 775 hostnamelen = mynamelen; 776 printf("nfs_boot: my_name=%s\n", hostname); 777 } 778 if (mydomain) { 779 mydomain[mydomainlen] = '\0'; 780 strncpy(domainname, mydomain, sizeof(domainname)); 781 domainnamelen = mydomainlen; 782 printf("nfs_boot: my_domain=%s\n", domainname); 783 } 784 nd->nd_myip = bootp->bp_yiaddr; 785 if (nd->nd_myip.s_addr) 786 printf("nfs_boot: my_addr=%s\n", inet_ntoa(nd->nd_myip)); 787 nd->nd_mask = netmask; 788 if (nd->nd_mask.s_addr) 789 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 790 nd->nd_gwip = gateway; 791 if (nd->nd_gwip.s_addr) 792 printf("nfs_boot: gateway=%s\n", inet_ntoa(nd->nd_gwip)); 793 794 /* 795 * Store the information about our NFS root mount. 796 * The caller will print it, so be silent here. 797 */ 798 { 799 struct nfs_dlmount *ndm = &nd->nd_root; 800 801 /* Server IP address. */ 802 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 803 memset((caddr_t)sin, 0, sizeof(*sin)); 804 sin->sin_len = sizeof(*sin); 805 sin->sin_family = AF_INET; 806 sin->sin_addr = rootserver; 807 /* Server name. */ 808 if (!overloaded && bootp->bp_sname[0] != 0 && 809 !memcmp(&rootserver, &bootp->bp_siaddr, 810 sizeof(struct in_addr))) { 811 /* standard root server, we have the name */ 812 strncpy(ndm->ndm_host, bootp->bp_sname, BP_SNAME_LEN-1); 813 } else { 814 /* Show the server IP address numerically. */ 815 strncpy(ndm->ndm_host, inet_ntoa(rootserver), 816 BP_SNAME_LEN-1); 817 } 818 len = strlen(ndm->ndm_host); 819 if (rootpath && 820 len + 1 + rootpathlen + 1 <= sizeof(ndm->ndm_host)) { 821 ndm->ndm_host[len++] = ':'; 822 strncpy(ndm->ndm_host + len, 823 rootpath, rootpathlen); 824 ndm->ndm_host[len + rootpathlen] = '\0'; 825 } /* else: upper layer will handle error */ 826 } 827 }
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