1 /* $NetBSD: nfs_bootdhcp.c,v 1.32 2006/11/09 09:53:57 yamt 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 1.32 2006/11/09 09:53:57 yamt 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 lwp *)); 227 static void bootp_extract __P((struct bootp *, int, struct nfs_diskless *)); 228 229 #ifdef DEBUG_NFS_BOOT_DHCP 230 #define DPRINTF(s) printf s 231 #else 232 #define DPRINTF(s) 233 #endif 234 235 236 /* 237 * Get our boot parameters using BOOTP. 238 */ 239 int 240 nfs_bootdhcp(nd, lwp) 241 struct nfs_diskless *nd; 242 struct lwp *lwp; 243 { 244 struct ifnet *ifp = nd->nd_ifp; 245 int error; 246 247 /* 248 * Do enough of ifconfig(8) so that the chosen interface 249 * can talk to the servers. Use address zero for now. 250 */ 251 error = nfs_boot_setaddress(ifp, lwp, INADDR_ANY, INADDR_ANY, 252 INADDR_BROADCAST); 253 if (error) { 254 printf("nfs_boot: set ifaddr zero, error=%d\n", error); 255 return (error); 256 } 257 258 /* This function call does the real send/recv work. */ 259 error = bootpc_call(nd, lwp); 260 261 /* Get rid of the temporary (zero) IP address. */ 262 (void) nfs_boot_deladdress(ifp, lwp, INADDR_ANY); 263 264 /* NOW we can test the error from bootpc_call. */ 265 if (error) 266 goto out; 267 268 /* 269 * Do ifconfig with our real IP address and mask. 270 */ 271 error = nfs_boot_setaddress(ifp, lwp, nd->nd_myip.s_addr, 272 nd->nd_mask.s_addr, INADDR_ANY); 273 if (error) { 274 printf("nfs_boot: set ifaddr real, error=%d\n", error); 275 goto out; 276 } 277 278 out: 279 if (error) { 280 (void) nfs_boot_ifupdown(ifp, lwp, 0); 281 nfs_boot_flushrt(ifp); 282 } 283 return (error); 284 } 285 286 struct bootpcontext { 287 int xid; 288 u_char *haddr; 289 u_char halen; 290 struct bootp *replybuf; 291 int replylen; 292 #ifdef NFS_BOOT_DHCP 293 char expected_dhcpmsgtype, dhcp_ok; 294 struct in_addr dhcp_serverip; 295 #endif 296 }; 297 298 static int bootpset __P((struct mbuf*, void*, int)); 299 static int bootpcheck __P((struct mbuf*, void*)); 300 301 static int 302 bootpset(struct mbuf *m, void *context, int waited) 303 { 304 struct bootp *bootp; 305 306 /* we know it's contigous (in 1 mbuf cluster) */ 307 bootp = mtod(m, struct bootp*); 308 309 bootp->bp_secs = htons(waited); 310 311 return (0); 312 } 313 314 static int 315 bootpcheck(m, context) 316 struct mbuf *m; 317 void *context; 318 { 319 struct bootp *bootp; 320 struct bootpcontext *bpc = context; 321 u_int tag, len; 322 u_char *p, *limit; 323 324 /* 325 * Is this a valid reply? 326 */ 327 if (m->m_pkthdr.len < BOOTP_SIZE_MIN) { 328 DPRINTF(("bootpcheck: short packet %d < %d\n", m->m_pkthdr.len, 329 BOOTP_SIZE_MIN)); 330 return (-1); 331 } 332 if (m->m_pkthdr.len > BOOTP_SIZE_MAX) { 333 DPRINTF(("bootpcheck: long packet %d > %d\n", m->m_pkthdr.len, 334 BOOTP_SIZE_MAX)); 335 return (-1); 336 } 337 338 /* 339 * don't make first checks more expensive than necessary 340 */ 341 if (m->m_len < offsetof(struct bootp, bp_sname)) { 342 m = m_pullup(m, offsetof(struct bootp, bp_sname)); 343 if (m == NULL) { 344 DPRINTF(("bootpcheck: m_pullup failed\n")); 345 return (-1); 346 } 347 } 348 bootp = mtod(m, struct bootp*); 349 350 if (bootp->bp_op != BOOTREPLY) { 351 DPRINTF(("bootpcheck: op %d is not reply\n", bootp->bp_op)); 352 return (-1); 353 } 354 if (bootp->bp_hlen != bpc->halen) { 355 DPRINTF(("bootpcheck: hlen %d != %d\n", bootp->bp_hlen, 356 bpc->halen)); 357 return (-1); 358 } 359 if (memcmp(bootp->bp_chaddr, bpc->haddr, bpc->halen)) { 360 #ifdef DEBUG_NFS_BOOT_DHCP 361 char bp_chaddr[3 * bpc->halen], haddr[3 * bpc->halen]; 362 #endif 363 DPRINTF(("bootpcheck: incorrect hwaddr %s != %s\n", 364 ether_snprintf(bp_chaddr, sizeof(bp_chaddr), 365 bootp->bp_chaddr), 366 ether_snprintf(haddr, sizeof(haddr), bpc->haddr))); 367 return (-1); 368 } 369 if (bootp->bp_xid != bpc->xid) { 370 DPRINTF(("bootpcheck: xid %d != %d\n", bootp->bp_xid, 371 bpc->xid)); 372 return (-1); 373 } 374 375 /* 376 * OK, it's worth to look deeper. 377 * We copy the mbuf into a flat buffer here because 378 * m_pullup() is a bit limited for this purpose 379 * (doesn't allocate a cluster if necessary). 380 */ 381 bpc->replylen = m->m_pkthdr.len; 382 m_copydata(m, 0, bpc->replylen, (caddr_t)bpc->replybuf); 383 bootp = bpc->replybuf; 384 385 /* 386 * Check if the IP address we get looks correct. 387 * (DHCP servers can send junk to unknown clients.) 388 * XXX more checks might be needed 389 */ 390 if (bootp->bp_yiaddr.s_addr == INADDR_ANY || 391 bootp->bp_yiaddr.s_addr == INADDR_BROADCAST) { 392 printf("nfs_boot: wrong IP addr %s", 393 inet_ntoa(bootp->bp_yiaddr)); 394 goto warn; 395 } 396 397 /* 398 * Check the vendor data. 399 */ 400 if (memcmp(bootp->bp_vend, vm_rfc1048, 4)) { 401 printf("nfs_boot: reply missing options"); 402 goto warn; 403 } 404 p = &bootp->bp_vend[4]; 405 limit = ((char*)bootp) + bpc->replylen; 406 while (p < limit) { 407 tag = *p++; 408 if (tag == TAG_END) 409 break; 410 if (tag == TAG_PAD) 411 continue; 412 len = *p++; 413 if ((p + len) > limit) { 414 printf("nfs_boot: option %d too long", tag); 415 goto warn; 416 } 417 switch (tag) { 418 #ifdef NFS_BOOT_DHCP 419 case TAG_DHCP_MSGTYPE: 420 if (*p != bpc->expected_dhcpmsgtype) 421 return (-1); 422 bpc->dhcp_ok = 1; 423 break; 424 case TAG_SERVERID: 425 memcpy(&bpc->dhcp_serverip.s_addr, p, 426 sizeof(bpc->dhcp_serverip.s_addr)); 427 break; 428 #endif 429 default: 430 break; 431 } 432 p += len; 433 } 434 return (0); 435 436 warn: 437 printf(" (bad reply from %s)\n", inet_ntoa(bootp->bp_siaddr)); 438 return (-1); 439 } 440 441 static int 442 bootpc_call(nd, lwp) 443 struct nfs_diskless *nd; 444 struct lwp *lwp; 445 { 446 struct socket *so; 447 struct ifnet *ifp = nd->nd_ifp; 448 static u_int32_t xid = ~0xFF; 449 struct bootp *bootp; /* request */ 450 struct mbuf *m, *nam; 451 struct sockaddr_in *sin; 452 int error; 453 u_char *haddr; 454 u_char hafmt, halen; 455 struct bootpcontext bpc; 456 #ifdef NFS_BOOT_DHCP 457 char vci[64]; 458 int vcilen; 459 #endif 460 461 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, lwp); 462 if (error) { 463 printf("bootp: socreate, error=%d\n", error); 464 return (error); 465 } 466 467 /* 468 * Initialize to NULL anything that will hold an allocation, 469 * and free each at the end if not null. 470 */ 471 bpc.replybuf = NULL; 472 m = nam = NULL; 473 474 /* Record our H/W (Ethernet) address. */ 475 { struct sockaddr_dl *sdl = ifp->if_sadl; 476 switch (sdl->sdl_type) { 477 case IFT_ISO88025: 478 hafmt = HTYPE_IEEE802; 479 break; 480 case IFT_ETHER: 481 case IFT_FDDI: 482 hafmt = HTYPE_ETHERNET; 483 break; 484 default: 485 printf("bootp: unsupported interface type %d\n", 486 sdl->sdl_type); 487 error = EINVAL; 488 goto out; 489 } 490 halen = sdl->sdl_alen; 491 haddr = (unsigned char *)LLADDR(sdl); 492 } 493 494 /* 495 * Skip the route table when sending on this socket. 496 * If this is not done, ip_output finds the loopback 497 * interface (why?) and then fails because broadcast 498 * is not supported on that interface... 499 */ 500 { int32_t *opt; 501 m = m_get(M_WAIT, MT_SOOPTS); 502 opt = mtod(m, int32_t *); 503 m->m_len = sizeof(*opt); 504 *opt = 1; 505 error = sosetopt(so, SOL_SOCKET, SO_DONTROUTE, m); 506 m = NULL; /* was consumed */ 507 } 508 if (error) { 509 DPRINTF(("bootpc_call: SO_DONTROUTE failed %d\n", error)); 510 goto out; 511 } 512 513 /* Enable broadcast. */ 514 if ((error = nfs_boot_enbroadcast(so))) { 515 DPRINTF(("bootpc_call: SO_BROADCAST failed %d\n", error)); 516 goto out; 517 } 518 519 /* 520 * Set some TTL so we can boot through routers. 521 * Real BOOTP forwarding agents don't need this; they obey "bp_hops" 522 * and set "bp_giaddr", thus rewrite the packet anyway. 523 * The "helper-address" feature of some popular router vendor seems 524 * to do simple IP forwarding and drops packets with (ip_ttl == 1). 525 */ 526 { u_char *opt; 527 m = m_get(M_WAIT, MT_SOOPTS); 528 opt = mtod(m, u_char *); 529 m->m_len = sizeof(*opt); 530 *opt = 7; 531 error = sosetopt(so, IPPROTO_IP, IP_MULTICAST_TTL, m); 532 m = NULL; /* was consumed */ 533 } 534 if (error) { 535 DPRINTF(("bootpc_call: IP_MULTICAST_TTL failed %d\n", error)); 536 goto out; 537 } 538 539 /* Set the receive timeout for the socket. */ 540 if ((error = nfs_boot_setrecvtimo(so))) { 541 DPRINTF(("bootpc_call: SO_RCVTIMEO failed %d\n", error)); 542 goto out; 543 } 544 545 /* 546 * Bind the local endpoint to a bootp client port. 547 */ 548 if ((error = nfs_boot_sobind_ipport(so, IPPORT_BOOTPC, lwp))) { 549 DPRINTF(("bootpc_call: bind failed %d\n", error)); 550 goto out; 551 } 552 553 /* 554 * Setup socket address for the server. 555 */ 556 nam = m_get(M_WAIT, MT_SONAME); 557 sin = mtod(nam, struct sockaddr_in *); 558 sin->sin_len = nam->m_len = sizeof(*sin); 559 sin->sin_family = AF_INET; 560 sin->sin_addr.s_addr = INADDR_BROADCAST; 561 sin->sin_port = htons(IPPORT_BOOTPS); 562 563 /* 564 * Allocate buffer used for request 565 */ 566 m = m_gethdr(M_WAIT, MT_DATA); 567 m_clget(m, M_WAIT); 568 bootp = mtod(m, struct bootp*); 569 m->m_pkthdr.len = m->m_len = BOOTP_SIZE_MAX; 570 m->m_pkthdr.rcvif = NULL; 571 572 /* 573 * Build the BOOTP reqest message. 574 * Note: xid is host order! (opaque to server) 575 */ 576 memset((caddr_t)bootp, 0, BOOTP_SIZE_MAX); 577 bootp->bp_op = BOOTREQUEST; 578 bootp->bp_htype = hafmt; 579 bootp->bp_hlen = halen; /* Hardware address length */ 580 bootp->bp_xid = ++xid; 581 memcpy(bootp->bp_chaddr, haddr, halen); 582 #ifdef NFS_BOOT_BOOTP_REQFILE 583 strncpy(bootp->bp_file, NFS_BOOT_BOOTP_REQFILE, sizeof(bootp->bp_file)); 584 #endif 585 /* Fill-in the vendor data. */ 586 memcpy(bootp->bp_vend, vm_rfc1048, 4); 587 #ifdef NFS_BOOT_DHCP 588 bootp->bp_vend[4] = TAG_DHCP_MSGTYPE; 589 bootp->bp_vend[5] = 1; 590 bootp->bp_vend[6] = DHCPDISCOVER; 591 /* 592 * Insert a NetBSD Vendor Class Identifier option. 593 */ 594 snprintf(vci, sizeof(vci), "%s:%s:kernel:%s", ostype, MACHINE, 595 osrelease); 596 vcilen = strlen(vci); 597 bootp->bp_vend[7] = TAG_CLASSID; 598 bootp->bp_vend[8] = vcilen; 599 memcpy(&bootp->bp_vend[9], vci, vcilen); 600 bootp->bp_vend[9 + vcilen] = TAG_END; 601 #else 602 bootp->bp_vend[4] = TAG_END; 603 #endif 604 605 bpc.xid = xid; 606 bpc.haddr = haddr; 607 bpc.halen = halen; 608 bpc.replybuf = malloc(BOOTP_SIZE_MAX, M_DEVBUF, M_WAITOK); 609 if (bpc.replybuf == NULL) 610 panic("nfs_boot: malloc reply buf"); 611 #ifdef NFS_BOOT_DHCP 612 bpc.expected_dhcpmsgtype = DHCPOFFER; 613 bpc.dhcp_ok = 0; 614 #endif 615 616 error = nfs_boot_sendrecv(so, nam, bootpset, m, 617 bootpcheck, 0, 0, &bpc, lwp); 618 if (error) 619 goto out; 620 621 #ifdef NFS_BOOT_DHCP 622 if (bpc.dhcp_ok) { 623 u_int32_t leasetime; 624 bootp->bp_vend[6] = DHCPREQUEST; 625 bootp->bp_vend[7] = TAG_REQ_ADDR; 626 bootp->bp_vend[8] = 4; 627 memcpy(&bootp->bp_vend[9], &bpc.replybuf->bp_yiaddr, 4); 628 bootp->bp_vend[13] = TAG_SERVERID; 629 bootp->bp_vend[14] = 4; 630 memcpy(&bootp->bp_vend[15], &bpc.dhcp_serverip.s_addr, 4); 631 bootp->bp_vend[19] = TAG_LEASETIME; 632 bootp->bp_vend[20] = 4; 633 leasetime = htonl(300); 634 memcpy(&bootp->bp_vend[21], &leasetime, 4); 635 bootp->bp_vend[25] = TAG_CLASSID; 636 bootp->bp_vend[26] = vcilen; 637 memcpy(&bootp->bp_vend[27], vci, vcilen); 638 bootp->bp_vend[27 + vcilen] = TAG_END; 639 640 bpc.expected_dhcpmsgtype = DHCPACK; 641 642 error = nfs_boot_sendrecv(so, nam, bootpset, m, 643 bootpcheck, 0, 0, &bpc, lwp); 644 if (error) 645 goto out; 646 } 647 #endif 648 649 /* 650 * bootpcheck() has copied the receive mbuf into 651 * the buffer at bpc.replybuf. 652 */ 653 #ifdef NFS_BOOT_DHCP 654 printf("nfs_boot: %s next-server: %s\n", 655 (bpc.dhcp_ok ? "DHCP" : "BOOTP"), 656 #else 657 printf("nfs_boot: BOOTP next-server: %s\n", 658 #endif 659 inet_ntoa(bpc.replybuf->bp_siaddr)); 660 661 bootp_extract(bpc.replybuf, bpc.replylen, nd); 662 663 out: 664 if (bpc.replybuf) 665 free(bpc.replybuf, M_DEVBUF); 666 if (m) 667 m_freem(m); 668 if (nam) 669 m_freem(nam); 670 soclose(so); 671 return (error); 672 } 673 674 static void 675 bootp_extract(bootp, replylen, nd) 676 struct bootp *bootp; 677 int replylen; 678 struct nfs_diskless *nd; 679 { 680 struct sockaddr_in *sin; 681 struct in_addr netmask; 682 struct in_addr gateway; 683 struct in_addr rootserver; 684 char *myname; /* my hostname */ 685 char *mydomain; /* my domainname */ 686 char *rootpath; 687 int mynamelen; 688 int mydomainlen; 689 int rootpathlen; 690 int overloaded; 691 u_int tag, len; 692 u_char *p, *limit; 693 694 /* Default these to "unspecified". */ 695 netmask.s_addr = 0; 696 gateway.s_addr = 0; 697 mydomain = myname = rootpath = NULL; 698 mydomainlen = mynamelen = rootpathlen = 0; 699 /* default root server to bootp next-server */ 700 rootserver = bootp->bp_siaddr; 701 /* assume that server name field is not overloaded by default */ 702 overloaded = 0; 703 704 p = &bootp->bp_vend[4]; 705 limit = ((char*)bootp) + replylen; 706 while (p < limit) { 707 tag = *p++; 708 if (tag == TAG_END) 709 break; 710 if (tag == TAG_PAD) 711 continue; 712 len = *p++; 713 #if 0 /* already done in bootpcheck() */ 714 if ((p + len) > limit) { 715 printf("nfs_boot: option %d too long\n", tag); 716 break; 717 } 718 #endif 719 switch (tag) { 720 case TAG_SUBNET_MASK: 721 memcpy(&netmask, p, 4); 722 break; 723 case TAG_GATEWAY: 724 /* Routers */ 725 memcpy(&gateway, p, 4); 726 break; 727 case TAG_HOST_NAME: 728 if (len >= sizeof(hostname)) { 729 printf("nfs_boot: host name >= %lu bytes", 730 (u_long)sizeof(hostname)); 731 break; 732 } 733 myname = p; 734 mynamelen = len; 735 break; 736 case TAG_DOMAIN_NAME: 737 if (len >= sizeof(domainname)) { 738 printf("nfs_boot: domain name >= %lu bytes", 739 (u_long)sizeof(domainname)); 740 break; 741 } 742 mydomain = p; 743 mydomainlen = len; 744 break; 745 case TAG_ROOT_PATH: 746 /* Leave some room for the server name. */ 747 if (len >= (MNAMELEN-10)) { 748 printf("nfs_boot: rootpath >=%d bytes", 749 (MNAMELEN-10)); 750 break; 751 } 752 rootpath = p; 753 rootpathlen = len; 754 break; 755 case TAG_SWAP_SERVER: 756 /* override NFS server address */ 757 memcpy(&rootserver, p, 4); 758 break; 759 #ifdef NFS_BOOT_DHCP 760 case TAG_OVERLOAD: 761 if (len > 0 && ((*p & 0x02) != 0)) 762 /* 763 * The server name field in the dhcp packet 764 * is overloaded and we can't find server 765 * name there. 766 */ 767 overloaded = 1; 768 break; 769 #endif 770 default: 771 break; 772 } 773 p += len; 774 } 775 776 /* 777 * Store and print network config info. 778 */ 779 if (myname) { 780 myname[mynamelen] = '\0'; 781 strncpy(hostname, myname, sizeof(hostname)); 782 hostnamelen = mynamelen; 783 printf("nfs_boot: my_name=%s\n", hostname); 784 } 785 if (mydomain) { 786 mydomain[mydomainlen] = '\0'; 787 strncpy(domainname, mydomain, sizeof(domainname)); 788 domainnamelen = mydomainlen; 789 printf("nfs_boot: my_domain=%s\n", domainname); 790 } 791 nd->nd_myip = bootp->bp_yiaddr; 792 if (nd->nd_myip.s_addr) 793 printf("nfs_boot: my_addr=%s\n", inet_ntoa(nd->nd_myip)); 794 nd->nd_mask = netmask; 795 if (nd->nd_mask.s_addr) 796 printf("nfs_boot: my_mask=%s\n", inet_ntoa(nd->nd_mask)); 797 nd->nd_gwip = gateway; 798 if (nd->nd_gwip.s_addr) 799 printf("nfs_boot: gateway=%s\n", inet_ntoa(nd->nd_gwip)); 800 801 /* 802 * Store the information about our NFS root mount. 803 * The caller will print it, so be silent here. 804 */ 805 { 806 struct nfs_dlmount *ndm = &nd->nd_root; 807 808 /* Server IP address. */ 809 sin = (struct sockaddr_in *) &ndm->ndm_saddr; 810 memset((caddr_t)sin, 0, sizeof(*sin)); 811 sin->sin_len = sizeof(*sin); 812 sin->sin_family = AF_INET; 813 sin->sin_addr = rootserver; 814 /* Server name. */ 815 if (!overloaded && bootp->bp_sname[0] != 0 && 816 !memcmp(&rootserver, &bootp->bp_siaddr, 817 sizeof(struct in_addr))) { 818 /* standard root server, we have the name */ 819 strncpy(ndm->ndm_host, bootp->bp_sname, BP_SNAME_LEN-1); 820 } else { 821 /* Show the server IP address numerically. */ 822 strncpy(ndm->ndm_host, inet_ntoa(rootserver), 823 BP_SNAME_LEN-1); 824 } 825 len = strlen(ndm->ndm_host); 826 if (rootpath && 827 len + 1 + rootpathlen + 1 <= sizeof(ndm->ndm_host)) { 828 ndm->ndm_host[len++] = ':'; 829 strncpy(ndm->ndm_host + len, 830 rootpath, rootpathlen); 831 ndm->ndm_host[len + rootpathlen] = '\0'; 832 } /* else: upper layer will handle error */ 833 } 834 } 835