Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/nfsclient/bootp_subr.c
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1 /*- 2 * Copyright (c) 1995 Gordon Ross, Adam Glass 3 * Copyright (c) 1992 Regents of the University of California. 4 * All rights reserved. 5 * 6 * This software was developed by the Computer Systems Engineering group 7 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 8 * contributed to Berkeley. 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 University of 21 * California, Lawrence Berkeley Laboratory and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * based on: 39 * nfs/krpc_subr.c 40 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $ 41 */ 42 43 #include <sys/cdefs.h> 44 __FBSDID("$FreeBSD$"); 45 46 #include "opt_bootp.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/kernel.h> 51 #include <sys/sockio.h> 52 #include <sys/malloc.h> 53 #include <sys/mount.h> 54 #include <sys/mbuf.h> 55 #include <sys/proc.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/sysctl.h> 59 #include <sys/uio.h> 60 61 #include <net/if.h> 62 #include <net/route.h> 63 64 #include <netinet/in.h> 65 #include <net/if_types.h> 66 #include <net/if_dl.h> 67 68 #include <rpc/rpcclnt.h> 69 70 #include <nfs/rpcv2.h> 71 #include <nfs/nfsproto.h> 72 #include <nfsclient/nfs.h> 73 #include <nfsclient/nfsdiskless.h> 74 #include <nfsclient/krpc.h> 75 #include <nfs/xdr_subs.h> 76 77 78 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */ 79 80 #ifndef BOOTP_SETTLE_DELAY 81 #define BOOTP_SETTLE_DELAY 3 82 #endif 83 84 /* 85 * What is the longest we will wait before re-sending a request? 86 * Note this is also the frequency of "RPC timeout" messages. 87 * The re-send loop count sup linearly to this maximum, so the 88 * first complaint will happen after (1+2+3+4+5)=15 seconds. 89 */ 90 #define MAX_RESEND_DELAY 5 /* seconds */ 91 92 /* Definitions from RFC951 */ 93 struct bootp_packet { 94 u_int8_t op; 95 u_int8_t htype; 96 u_int8_t hlen; 97 u_int8_t hops; 98 u_int32_t xid; 99 u_int16_t secs; 100 u_int16_t flags; 101 struct in_addr ciaddr; 102 struct in_addr yiaddr; 103 struct in_addr siaddr; 104 struct in_addr giaddr; 105 unsigned char chaddr[16]; 106 char sname[64]; 107 char file[128]; 108 unsigned char vend[1222]; 109 }; 110 111 struct bootpc_ifcontext { 112 struct bootpc_ifcontext *next; 113 struct bootp_packet call; 114 struct bootp_packet reply; 115 int replylen; 116 int overload; 117 struct socket *so; 118 struct ifreq ireq; 119 struct ifnet *ifp; 120 struct sockaddr_dl *sdl; 121 struct sockaddr_in myaddr; 122 struct sockaddr_in netmask; 123 struct sockaddr_in gw; 124 struct sockaddr_in broadcast; /* Different for each interface */ 125 int gotgw; 126 int gotnetmask; 127 int gotrootpath; 128 int outstanding; 129 int sentmsg; 130 u_int32_t xid; 131 enum { 132 IF_BOOTP_UNRESOLVED, 133 IF_BOOTP_RESOLVED, 134 IF_BOOTP_FAILED, 135 IF_DHCP_UNRESOLVED, 136 IF_DHCP_OFFERED, 137 IF_DHCP_RESOLVED, 138 IF_DHCP_FAILED, 139 } state; 140 int dhcpquerytype; /* dhcp type sent */ 141 struct in_addr dhcpserver; 142 int gotdhcpserver; 143 }; 144 145 #define TAG_MAXLEN 1024 146 struct bootpc_tagcontext { 147 char buf[TAG_MAXLEN + 1]; 148 int overload; 149 int badopt; 150 int badtag; 151 int foundopt; 152 int taglen; 153 }; 154 155 struct bootpc_globalcontext { 156 struct bootpc_ifcontext *interfaces; 157 struct bootpc_ifcontext *lastinterface; 158 u_int32_t xid; 159 int gotrootpath; 160 int gotgw; 161 int ifnum; 162 int secs; 163 int starttime; 164 struct bootp_packet reply; 165 int replylen; 166 struct bootpc_ifcontext *setrootfs; 167 struct bootpc_ifcontext *sethostname; 168 struct bootpc_tagcontext tmptag; 169 struct bootpc_tagcontext tag; 170 }; 171 172 #define IPPORT_BOOTPC 68 173 #define IPPORT_BOOTPS 67 174 175 #define BOOTP_REQUEST 1 176 #define BOOTP_REPLY 2 177 178 /* Common tags */ 179 #define TAG_PAD 0 /* Pad option, implicit length 1 */ 180 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */ 181 #define TAG_ROUTERS 3 /* Routers (in order of preference) */ 182 #define TAG_HOSTNAME 12 /* Client host name */ 183 #define TAG_ROOT 17 /* Root path */ 184 185 /* DHCP specific tags */ 186 #define TAG_OVERLOAD 52 /* Option Overload */ 187 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */ 188 189 #define TAG_END 255 /* End Option (i.e. no more options) */ 190 191 /* Overload values */ 192 #define OVERLOAD_FILE 1 193 #define OVERLOAD_SNAME 2 194 195 /* Site specific tags: */ 196 #define TAG_ROOTOPTS 130 197 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */ 198 199 #define TAG_DHCP_MSGTYPE 53 200 #define TAG_DHCP_REQ_ADDR 50 201 #define TAG_DHCP_SERVERID 54 202 #define TAG_DHCP_LEASETIME 51 203 204 #define TAG_VENDOR_INDENTIFIER 60 205 206 #define DHCP_NOMSG 0 207 #define DHCP_DISCOVER 1 208 #define DHCP_OFFER 2 209 #define DHCP_REQUEST 3 210 #define DHCP_ACK 5 211 212 static char bootp_cookie[128]; 213 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, 214 bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); 215 216 /* mountd RPC */ 217 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, 218 int *fhsizep, struct nfs_args *args, struct thread *td); 219 static int setfs(struct sockaddr_in *addr, char *path, char *p, 220 const struct in_addr *siaddr); 221 static int getdec(char **ptr); 222 static int getip(char **ptr, struct in_addr *ip); 223 static void mountopts(struct nfs_args *args, char *p); 224 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 225 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 226 static void print_in_addr(struct in_addr addr); 227 static void print_sin_addr(struct sockaddr_in *addr); 228 static void clear_sinaddr(struct sockaddr_in *sin); 229 static void allocifctx(struct bootpc_globalcontext *gctx); 230 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx, 231 struct bootpc_globalcontext *gctx, struct thread *td); 232 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx, 233 struct bootp_packet *bp, int len, int tag); 234 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx, 235 unsigned char *start, int len, int tag); 236 237 #ifdef BOOTP_DEBUG 238 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma); 239 void bootpboot_p_ma(struct sockaddr *ma); 240 void bootpboot_p_rtentry(struct rtentry *rt); 241 void bootpboot_p_tree(struct radix_node *rn); 242 void bootpboot_p_rtlist(void); 243 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa); 244 void bootpboot_p_iflist(void); 245 #endif 246 247 static int bootpc_call(struct bootpc_globalcontext *gctx, 248 struct thread *td); 249 250 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 251 struct bootpc_globalcontext *gctx, struct thread *td); 252 253 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 254 struct bootpc_globalcontext *gctx, struct thread *td); 255 256 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 257 struct bootpc_ifcontext *ifctx, 258 struct bootpc_globalcontext *gctx); 259 260 static int bootpc_received(struct bootpc_globalcontext *gctx, 261 struct bootpc_ifcontext *ifctx); 262 263 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 264 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 265 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 266 267 /* 268 * In order to have multiple active interfaces with address 0.0.0.0 269 * and be able to send data to a selected interface, we perform 270 * some tricks: 271 * 272 * - The 'broadcast' address is different for each interface. 273 * 274 * - We temporarily add routing pointing 255.255.255.255 to the 275 * selected interface broadcast address, thus the packet sent 276 * goes to that interface. 277 */ 278 279 #ifdef BOOTP_DEBUG 280 void 281 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma) 282 { 283 284 if (sa == NULL) { 285 printf("(sockaddr *) <null>"); 286 return; 287 } 288 switch (sa->sa_family) { 289 case AF_INET: 290 { 291 struct sockaddr_in *sin; 292 293 sin = (struct sockaddr_in *) sa; 294 printf("inet "); 295 print_sin_addr(sin); 296 if (ma != NULL) { 297 sin = (struct sockaddr_in *) ma; 298 printf(" mask "); 299 print_sin_addr(sin); 300 } 301 } 302 break; 303 case AF_LINK: 304 { 305 struct sockaddr_dl *sli; 306 int i; 307 308 sli = (struct sockaddr_dl *) sa; 309 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data); 310 for (i = 0; i < sli->sdl_alen; i++) { 311 if (i > 0) 312 printf(":"); 313 printf("%x", ((unsigned char *) LLADDR(sli))[i]); 314 } 315 } 316 break; 317 default: 318 printf("af%d", sa->sa_family); 319 } 320 } 321 322 void 323 bootpboot_p_ma(struct sockaddr *ma) 324 { 325 326 if (ma == NULL) { 327 printf("<null>"); 328 return; 329 } 330 printf("%x", *(int *)ma); 331 } 332 333 void 334 bootpboot_p_rtentry(struct rtentry *rt) 335 { 336 337 bootpboot_p_sa(rt_key(rt), rt_mask(rt)); 338 printf(" "); 339 bootpboot_p_ma(rt->rt_genmask); 340 printf(" "); 341 bootpboot_p_sa(rt->rt_gateway, NULL); 342 printf(" "); 343 printf("flags %x", (unsigned short) rt->rt_flags); 344 printf(" %d", (int) rt->rt_rmx.rmx_expire); 345 printf(" %s\n", rt->rt_ifp->if_xname); 346 } 347 348 void 349 bootpboot_p_tree(struct radix_node *rn) 350 { 351 352 while (rn != NULL) { 353 if (rn->rn_bit < 0) { 354 if ((rn->rn_flags & RNF_ROOT) != 0) { 355 } else { 356 bootpboot_p_rtentry((struct rtentry *) rn); 357 } 358 rn = rn->rn_dupedkey; 359 } else { 360 bootpboot_p_tree(rn->rn_left); 361 bootpboot_p_tree(rn->rn_right); 362 return; 363 } 364 } 365 } 366 367 void 368 bootpboot_p_rtlist(void) 369 { 370 371 printf("Routing table:\n"); 372 RADIX_NODE_LOCK(rt_tables[AF_INET]); /* could sleep XXX */ 373 bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop); 374 RADIX_NODE_UNLOCK(rt_tables[AF_INET]); 375 } 376 377 void 378 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 379 { 380 381 printf("%s flags %x, addr ", 382 ifp->if_xname, ifp->if_flags); 383 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 384 printf(", broadcast "); 385 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 386 printf(", netmask "); 387 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 388 printf("\n"); 389 } 390 391 void 392 bootpboot_p_iflist(void) 393 { 394 struct ifnet *ifp; 395 struct ifaddr *ifa; 396 397 printf("Interface list:\n"); 398 IFNET_RLOCK(); /* could sleep, but okay for debugging XXX */ 399 for (ifp = TAILQ_FIRST(&ifnet); 400 ifp != NULL; 401 ifp = TAILQ_NEXT(ifp, if_link)) { 402 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); 403 ifa != NULL; 404 ifa = TAILQ_NEXT(ifa, ifa_link)) 405 if (ifa->ifa_addr->sa_family == AF_INET) 406 bootpboot_p_if(ifp, ifa); 407 } 408 IFNET_RUNLOCK(); 409 } 410 #endif /* defined(BOOTP_DEBUG) */ 411 412 static void 413 clear_sinaddr(struct sockaddr_in *sin) 414 { 415 416 bzero(sin, sizeof(*sin)); 417 sin->sin_len = sizeof(*sin); 418 sin->sin_family = AF_INET; 419 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 420 sin->sin_port = 0; 421 } 422 423 static void 424 allocifctx(struct bootpc_globalcontext *gctx) 425 { 426 struct bootpc_ifcontext *ifctx; 427 ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx), 428 M_TEMP, M_WAITOK | M_ZERO); 429 if (ifctx == NULL) 430 panic("Failed to allocate bootp interface context structure"); 431 432 ifctx->xid = gctx->xid; 433 #ifdef BOOTP_NO_DHCP 434 ifctx->state = IF_BOOTP_UNRESOLVED; 435 #else 436 ifctx->state = IF_DHCP_UNRESOLVED; 437 #endif 438 gctx->xid += 0x100; 439 if (gctx->interfaces != NULL) 440 gctx->lastinterface->next = ifctx; 441 else 442 gctx->interfaces = ifctx; 443 gctx->lastinterface = ifctx; 444 } 445 446 static __inline int 447 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 448 { 449 450 if (ifctx->state == IF_BOOTP_RESOLVED || 451 ifctx->state == IF_DHCP_RESOLVED) 452 return 1; 453 return 0; 454 } 455 456 static __inline int 457 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 458 { 459 460 if (ifctx->state == IF_BOOTP_UNRESOLVED || 461 ifctx->state == IF_DHCP_UNRESOLVED) 462 return 1; 463 return 0; 464 } 465 466 static __inline int 467 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 468 { 469 470 if (ifctx->state == IF_BOOTP_FAILED || 471 ifctx->state == IF_DHCP_FAILED) 472 return 1; 473 return 0; 474 } 475 476 static int 477 bootpc_received(struct bootpc_globalcontext *gctx, 478 struct bootpc_ifcontext *ifctx) 479 { 480 unsigned char dhcpreplytype; 481 char *p; 482 483 /* 484 * Need timeout for fallback to less 485 * desirable alternative. 486 */ 487 488 /* This call used for the side effect (badopt flag) */ 489 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 490 gctx->replylen, 491 TAG_END); 492 493 /* If packet is invalid, ignore it */ 494 if (gctx->tmptag.badopt != 0) 495 return 0; 496 497 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 498 gctx->replylen, TAG_DHCP_MSGTYPE); 499 if (p != NULL) 500 dhcpreplytype = *p; 501 else 502 dhcpreplytype = DHCP_NOMSG; 503 504 switch (ifctx->dhcpquerytype) { 505 case DHCP_DISCOVER: 506 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 507 #ifndef BOOTP_FORCE_DHCP 508 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 509 #endif 510 ) 511 return 0; 512 break; 513 case DHCP_REQUEST: 514 if (dhcpreplytype != DHCP_ACK) 515 return 0; 516 case DHCP_NOMSG: 517 break; 518 } 519 520 /* Ignore packet unless it gives us a root tag we didn't have */ 521 522 if ((ifctx->state == IF_BOOTP_RESOLVED || 523 (ifctx->dhcpquerytype == DHCP_DISCOVER && 524 (ifctx->state == IF_DHCP_OFFERED || 525 ifctx->state == IF_DHCP_RESOLVED))) && 526 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 527 ifctx->replylen, 528 TAG_ROOT) != NULL || 529 bootpc_tag(&gctx->tmptag, &gctx->reply, 530 gctx->replylen, 531 TAG_ROOT) == NULL)) 532 return 0; 533 534 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 535 ifctx->replylen = gctx->replylen; 536 537 /* XXX: Only reset if 'perfect' response */ 538 if (ifctx->state == IF_BOOTP_UNRESOLVED) 539 ifctx->state = IF_BOOTP_RESOLVED; 540 else if (ifctx->state == IF_DHCP_UNRESOLVED && 541 ifctx->dhcpquerytype == DHCP_DISCOVER) { 542 if (dhcpreplytype == DHCP_OFFER) 543 ifctx->state = IF_DHCP_OFFERED; 544 else 545 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 546 } else if (ifctx->state == IF_DHCP_OFFERED && 547 ifctx->dhcpquerytype == DHCP_REQUEST) 548 ifctx->state = IF_DHCP_RESOLVED; 549 550 551 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 552 ifctx->state != IF_BOOTP_RESOLVED) { 553 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 554 ifctx->replylen, TAG_DHCP_SERVERID); 555 if (p != NULL && gctx->tmptag.taglen == 4) { 556 memcpy(&ifctx->dhcpserver, p, 4); 557 ifctx->gotdhcpserver = 1; 558 } else 559 ifctx->gotdhcpserver = 0; 560 return 1; 561 } 562 563 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 564 ifctx->replylen, 565 TAG_ROOT) != NULL); 566 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 567 ifctx->replylen, 568 TAG_ROUTERS) != NULL); 569 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 570 ifctx->replylen, 571 TAG_SUBNETMASK) != NULL); 572 return 1; 573 } 574 575 static int 576 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 577 { 578 struct socket *so; 579 struct sockaddr_in *sin, dst; 580 struct uio auio; 581 struct sockopt sopt; 582 struct iovec aio; 583 int error, on, rcvflg, timo, len; 584 time_t atimo; 585 time_t rtimo; 586 struct timeval tv; 587 struct bootpc_ifcontext *ifctx; 588 int outstanding; 589 int gotrootpath; 590 int retry; 591 const char *s; 592 593 /* 594 * Create socket and set its recieve timeout. 595 */ 596 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td); 597 if (error != 0) 598 goto out0; 599 600 tv.tv_sec = 1; 601 tv.tv_usec = 0; 602 bzero(&sopt, sizeof(sopt)); 603 sopt.sopt_dir = SOPT_SET; 604 sopt.sopt_level = SOL_SOCKET; 605 sopt.sopt_name = SO_RCVTIMEO; 606 sopt.sopt_val = &tv; 607 sopt.sopt_valsize = sizeof tv; 608 609 error = sosetopt(so, &sopt); 610 if (error != 0) 611 goto out; 612 613 /* 614 * Enable broadcast. 615 */ 616 on = 1; 617 sopt.sopt_name = SO_BROADCAST; 618 sopt.sopt_val = &on; 619 sopt.sopt_valsize = sizeof on; 620 621 error = sosetopt(so, &sopt); 622 if (error != 0) 623 goto out; 624 625 /* 626 * Disable routing. 627 */ 628 629 on = 1; 630 sopt.sopt_name = SO_DONTROUTE; 631 sopt.sopt_val = &on; 632 sopt.sopt_valsize = sizeof on; 633 634 error = sosetopt(so, &sopt); 635 if (error != 0) 636 goto out; 637 638 /* 639 * Bind the local endpoint to a bootp client port. 640 */ 641 sin = &dst; 642 clear_sinaddr(sin); 643 sin->sin_port = htons(IPPORT_BOOTPC); 644 error = sobind(so, (struct sockaddr *)sin, td); 645 if (error != 0) { 646 printf("bind failed\n"); 647 goto out; 648 } 649 650 /* 651 * Setup socket address for the server. 652 */ 653 sin = &dst; 654 clear_sinaddr(sin); 655 sin->sin_addr.s_addr = INADDR_BROADCAST; 656 sin->sin_port = htons(IPPORT_BOOTPS); 657 658 /* 659 * Send it, repeatedly, until a reply is received, 660 * but delay each re-send by an increasing amount. 661 * If the delay hits the maximum, start complaining. 662 */ 663 timo = 0; 664 rtimo = 0; 665 for (;;) { 666 667 outstanding = 0; 668 gotrootpath = 0; 669 670 for (ifctx = gctx->interfaces; 671 ifctx != NULL; 672 ifctx = ifctx->next) { 673 if (bootpc_ifctx_isresolved(ifctx) != 0 && 674 bootpc_tag(&gctx->tmptag, &ifctx->reply, 675 ifctx->replylen, 676 TAG_ROOT) != NULL) 677 gotrootpath = 1; 678 } 679 680 for (ifctx = gctx->interfaces; 681 ifctx != NULL; 682 ifctx = ifctx->next) { 683 ifctx->outstanding = 0; 684 if (bootpc_ifctx_isresolved(ifctx) != 0 && 685 gotrootpath != 0) { 686 continue; 687 } 688 if (bootpc_ifctx_isfailed(ifctx) != 0) 689 continue; 690 691 outstanding++; 692 ifctx->outstanding = 1; 693 694 /* Proceed to next step in DHCP negotiation */ 695 if ((ifctx->state == IF_DHCP_OFFERED && 696 ifctx->dhcpquerytype != DHCP_REQUEST) || 697 (ifctx->state == IF_DHCP_UNRESOLVED && 698 ifctx->dhcpquerytype != DHCP_DISCOVER) || 699 (ifctx->state == IF_BOOTP_UNRESOLVED && 700 ifctx->dhcpquerytype != DHCP_NOMSG)) { 701 ifctx->sentmsg = 0; 702 bootpc_compose_query(ifctx, gctx, td); 703 } 704 705 /* Send BOOTP request (or re-send). */ 706 707 if (ifctx->sentmsg == 0) { 708 switch(ifctx->dhcpquerytype) { 709 case DHCP_DISCOVER: 710 s = "DHCP Discover"; 711 break; 712 case DHCP_REQUEST: 713 s = "DHCP Request"; 714 break; 715 case DHCP_NOMSG: 716 default: 717 s = "BOOTP Query"; 718 break; 719 } 720 printf("Sending %s packet from " 721 "interface %s (%*D)\n", 722 s, 723 ifctx->ireq.ifr_name, 724 ifctx->sdl->sdl_alen, 725 (unsigned char *) LLADDR(ifctx->sdl), 726 ":"); 727 ifctx->sentmsg = 1; 728 } 729 730 aio.iov_base = (caddr_t) &ifctx->call; 731 aio.iov_len = sizeof(ifctx->call); 732 733 auio.uio_iov = &aio; 734 auio.uio_iovcnt = 1; 735 auio.uio_segflg = UIO_SYSSPACE; 736 auio.uio_rw = UIO_WRITE; 737 auio.uio_offset = 0; 738 auio.uio_resid = sizeof(ifctx->call); 739 auio.uio_td = td; 740 741 /* Set netmask to 0.0.0.0 */ 742 743 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr; 744 clear_sinaddr(sin); 745 error = ifioctl(ifctx->so, SIOCSIFNETMASK, 746 (caddr_t) &ifctx->ireq, td); 747 if (error != 0) 748 panic("bootpc_call:" 749 "set if netmask, error=%d", 750 error); 751 752 error = sosend(so, (struct sockaddr *) &dst, 753 &auio, NULL, NULL, 0, td); 754 if (error != 0) { 755 printf("bootpc_call: sosend: %d state %08x\n", 756 error, (int) so->so_state); 757 } 758 759 /* XXX: Is this needed ? */ 760 pause("bootpw", hz/10); 761 762 /* Set netmask to 255.0.0.0 */ 763 764 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr; 765 clear_sinaddr(sin); 766 sin->sin_addr.s_addr = htonl(0xff000000u); 767 error = ifioctl(ifctx->so, SIOCSIFNETMASK, 768 (caddr_t) &ifctx->ireq, td); 769 if (error != 0) 770 panic("bootpc_call:" 771 "set if netmask, error=%d", 772 error); 773 774 } 775 776 if (outstanding == 0 && 777 (rtimo == 0 || time_second >= rtimo)) { 778 error = 0; 779 goto gotreply; 780 } 781 782 /* Determine new timeout. */ 783 if (timo < MAX_RESEND_DELAY) 784 timo++; 785 else { 786 printf("DHCP/BOOTP timeout for server "); 787 print_sin_addr(&dst); 788 printf("\n"); 789 } 790 791 /* 792 * Wait for up to timo seconds for a reply. 793 * The socket receive timeout was set to 1 second. 794 */ 795 atimo = timo + time_second; 796 while (time_second < atimo) { 797 aio.iov_base = (caddr_t) &gctx->reply; 798 aio.iov_len = sizeof(gctx->reply); 799 800 auio.uio_iov = &aio; 801 auio.uio_iovcnt = 1; 802 auio.uio_segflg = UIO_SYSSPACE; 803 auio.uio_rw = UIO_READ; 804 auio.uio_offset = 0; 805 auio.uio_resid = sizeof(gctx->reply); 806 auio.uio_td = td; 807 808 rcvflg = 0; 809 error = soreceive(so, NULL, &auio, 810 NULL, NULL, &rcvflg); 811 gctx->secs = time_second - gctx->starttime; 812 for (ifctx = gctx->interfaces; 813 ifctx != NULL; 814 ifctx = ifctx->next) { 815 if (bootpc_ifctx_isresolved(ifctx) != 0 || 816 bootpc_ifctx_isfailed(ifctx) != 0) 817 continue; 818 819 ifctx->call.secs = htons(gctx->secs); 820 } 821 if (error == EWOULDBLOCK) 822 continue; 823 if (error != 0) 824 goto out; 825 len = sizeof(gctx->reply) - auio.uio_resid; 826 827 /* Do we have the required number of bytes ? */ 828 if (len < BOOTP_MIN_LEN) 829 continue; 830 gctx->replylen = len; 831 832 /* Is it a reply? */ 833 if (gctx->reply.op != BOOTP_REPLY) 834 continue; 835 836 /* Is this an answer to our query */ 837 for (ifctx = gctx->interfaces; 838 ifctx != NULL; 839 ifctx = ifctx->next) { 840 if (gctx->reply.xid != ifctx->call.xid) 841 continue; 842 843 /* Same HW address size ? */ 844 if (gctx->reply.hlen != ifctx->call.hlen) 845 continue; 846 847 /* Correct HW address ? */ 848 if (bcmp(gctx->reply.chaddr, 849 ifctx->call.chaddr, 850 ifctx->call.hlen) != 0) 851 continue; 852 853 break; 854 } 855 856 if (ifctx != NULL) { 857 s = bootpc_tag(&gctx->tmptag, 858 &gctx->reply, 859 gctx->replylen, 860 TAG_DHCP_MSGTYPE); 861 if (s != NULL) { 862 switch (*s) { 863 case DHCP_OFFER: 864 s = "DHCP Offer"; 865 break; 866 case DHCP_ACK: 867 s = "DHCP Ack"; 868 break; 869 default: 870 s = "DHCP (unexpected)"; 871 break; 872 } 873 } else 874 s = "BOOTP Reply"; 875 876 printf("Received %s packet" 877 " on %s from ", 878 s, 879 ifctx->ireq.ifr_name); 880 print_in_addr(gctx->reply.siaddr); 881 if (gctx->reply.giaddr.s_addr != 882 htonl(INADDR_ANY)) { 883 printf(" via "); 884 print_in_addr(gctx->reply.giaddr); 885 } 886 if (bootpc_received(gctx, ifctx) != 0) { 887 printf(" (accepted)"); 888 if (ifctx->outstanding) { 889 ifctx->outstanding = 0; 890 outstanding--; 891 } 892 /* Network settle delay */ 893 if (outstanding == 0) 894 atimo = time_second + 895 BOOTP_SETTLE_DELAY; 896 } else 897 printf(" (ignored)"); 898 if (ifctx->gotrootpath) { 899 gotrootpath = 1; 900 rtimo = time_second + 901 BOOTP_SETTLE_DELAY; 902 printf(" (got root path)"); 903 } else 904 printf(" (no root path)"); 905 printf("\n"); 906 } 907 } /* while secs */ 908 #ifdef BOOTP_TIMEOUT 909 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0) 910 break; 911 #endif 912 /* Force a retry if halfway in DHCP negotiation */ 913 retry = 0; 914 for (ifctx = gctx->interfaces; ifctx != NULL; 915 ifctx = ifctx->next) { 916 if (ifctx->state == IF_DHCP_OFFERED) { 917 if (ifctx->dhcpquerytype == DHCP_DISCOVER) 918 retry = 1; 919 else 920 ifctx->state = IF_DHCP_UNRESOLVED; 921 } 922 } 923 924 if (retry != 0) 925 continue; 926 927 if (gotrootpath != 0) { 928 gctx->gotrootpath = gotrootpath; 929 if (rtimo != 0 && time_second >= rtimo) 930 break; 931 } 932 } /* forever send/receive */ 933 934 /* 935 * XXX: These are errors of varying seriousness being silently 936 * ignored 937 */ 938 939 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) { 940 if (bootpc_ifctx_isresolved(ifctx) == 0) { 941 printf("%s timeout for interface %s\n", 942 ifctx->dhcpquerytype != DHCP_NOMSG ? 943 "DHCP" : "BOOTP", 944 ifctx->ireq.ifr_name); 945 } 946 } 947 if (gctx->gotrootpath != 0) { 948 #if 0 949 printf("Got a root path, ignoring remaining timeout\n"); 950 #endif 951 error = 0; 952 goto out; 953 } 954 #ifndef BOOTP_NFSROOT 955 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) { 956 if (bootpc_ifctx_isresolved(ifctx) != 0) { 957 error = 0; 958 goto out; 959 } 960 } 961 #endif 962 error = ETIMEDOUT; 963 goto out; 964 965 gotreply: 966 out: 967 soclose(so); 968 out0: 969 return error; 970 } 971 972 static int 973 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 974 struct bootpc_globalcontext *gctx, struct thread *td) 975 { 976 struct sockaddr_in *sin; 977 int error; 978 struct ifreq *ireq; 979 struct socket *so; 980 struct ifaddr *ifa; 981 struct sockaddr_dl *sdl; 982 983 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td); 984 if (error != 0) 985 panic("nfs_boot: socreate, error=%d", error); 986 987 ireq = &ifctx->ireq; 988 so = ifctx->so; 989 990 /* 991 * Bring up the interface. 992 * 993 * Get the old interface flags and or IFF_UP into them; if 994 * IFF_UP set blindly, interface selection can be clobbered. 995 */ 996 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td); 997 if (error != 0) 998 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error); 999 ireq->ifr_flags |= IFF_UP; 1000 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td); 1001 if (error != 0) 1002 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error); 1003 1004 /* 1005 * Do enough of ifconfig(8) so that the chosen interface 1006 * can talk to the servers. (just set the address) 1007 */ 1008 1009 /* addr is 0.0.0.0 */ 1010 1011 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1012 clear_sinaddr(sin); 1013 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td); 1014 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces)) 1015 panic("bootpc_fakeup_interface: " 1016 "set if addr, error=%d", error); 1017 1018 /* netmask is 255.0.0.0 */ 1019 1020 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1021 clear_sinaddr(sin); 1022 sin->sin_addr.s_addr = htonl(0xff000000u); 1023 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td); 1024 if (error != 0) 1025 panic("bootpc_fakeup_interface: set if netmask, error=%d", 1026 error); 1027 1028 /* Broadcast is 255.255.255.255 */ 1029 1030 sin = (struct sockaddr_in *)&ireq->ifr_addr; 1031 clear_sinaddr(sin); 1032 clear_sinaddr(&ifctx->broadcast); 1033 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST); 1034 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr; 1035 1036 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td); 1037 if (error != 0) 1038 panic("bootpc_fakeup_interface: " 1039 "set if broadcast addr, error=%d", 1040 error); 1041 1042 /* Get HW address */ 1043 1044 sdl = NULL; 1045 TAILQ_FOREACH(ifa, &ifctx->ifp->if_addrhead, ifa_link) 1046 if (ifa->ifa_addr->sa_family == AF_LINK) { 1047 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1048 if (sdl->sdl_type == IFT_ETHER) 1049 break; 1050 } 1051 1052 if (sdl == NULL) 1053 panic("bootpc: Unable to find HW address for %s", 1054 ifctx->ireq.ifr_name); 1055 ifctx->sdl = sdl; 1056 1057 return error; 1058 } 1059 1060 1061 static int 1062 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 1063 struct bootpc_globalcontext *gctx, struct thread *td) 1064 { 1065 int error; 1066 struct sockaddr_in defdst; 1067 struct sockaddr_in defmask; 1068 struct sockaddr_in *sin; 1069 struct ifreq *ireq; 1070 struct socket *so; 1071 struct sockaddr_in *myaddr; 1072 struct sockaddr_in *netmask; 1073 struct sockaddr_in *gw; 1074 1075 ireq = &ifctx->ireq; 1076 so = ifctx->so; 1077 myaddr = &ifctx->myaddr; 1078 netmask = &ifctx->netmask; 1079 gw = &ifctx->gw; 1080 1081 if (bootpc_ifctx_isresolved(ifctx) == 0) { 1082 1083 /* Shutdown interfaces where BOOTP failed */ 1084 1085 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); 1086 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td); 1087 if (error != 0) 1088 panic("bootpc_adjust_interface: " 1089 "SIOCGIFFLAGS, error=%d", error); 1090 ireq->ifr_flags &= ~IFF_UP; 1091 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td); 1092 if (error != 0) 1093 panic("bootpc_adjust_interface: " 1094 "SIOCSIFFLAGS, error=%d", error); 1095 1096 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1097 clear_sinaddr(sin); 1098 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td); 1099 if (error != 0 && (error != EEXIST || 1100 ifctx == gctx->interfaces)) 1101 panic("bootpc_adjust_interface: " 1102 "SIOCDIFADDR, error=%d", error); 1103 1104 return 0; 1105 } 1106 1107 printf("Adjusted interface %s\n", ifctx->ireq.ifr_name); 1108 /* 1109 * Do enough of ifconfig(8) so that the chosen interface 1110 * can talk to the servers. (just set the address) 1111 */ 1112 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask)); 1113 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td); 1114 if (error != 0) 1115 panic("bootpc_adjust_interface: " 1116 "set if netmask, error=%d", error); 1117 1118 /* Broadcast is with host part of IP address all 1's */ 1119 1120 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1121 clear_sinaddr(sin); 1122 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr | 1123 ~ netmask->sin_addr.s_addr; 1124 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td); 1125 if (error != 0) 1126 panic("bootpc_adjust_interface: " 1127 "set if broadcast addr, error=%d", error); 1128 1129 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr)); 1130 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td); 1131 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces)) 1132 panic("bootpc_adjust_interface: " 1133 "set if addr, error=%d", error); 1134 1135 /* Add new default route */ 1136 1137 if (ifctx->gotgw != 0 || gctx->gotgw == 0) { 1138 clear_sinaddr(&defdst); 1139 clear_sinaddr(&defmask); 1140 /* XXX MRT just table 0 */ 1141 error = rtrequest_fib(RTM_ADD, 1142 (struct sockaddr *) &defdst, 1143 (struct sockaddr *) gw, 1144 (struct sockaddr *) &defmask, 1145 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, 0); 1146 if (error != 0) { 1147 printf("bootpc_adjust_interface: " 1148 "add net route, error=%d\n", error); 1149 return error; 1150 } 1151 } 1152 1153 return 0; 1154 } 1155 1156 static int 1157 setfs(struct sockaddr_in *addr, char *path, char *p, 1158 const struct in_addr *siaddr) 1159 { 1160 1161 if (getip(&p, &addr->sin_addr) == 0) { 1162 if (siaddr != NULL && *p == '/') 1163 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr)); 1164 else 1165 return 0; 1166 } else { 1167 if (*p != ':') 1168 return 0; 1169 p++; 1170 } 1171 1172 addr->sin_len = sizeof(struct sockaddr_in); 1173 addr->sin_family = AF_INET; 1174 1175 strlcpy(path, p, MNAMELEN); 1176 return 1; 1177 } 1178 1179 static int 1180 getip(char **ptr, struct in_addr *addr) 1181 { 1182 char *p; 1183 unsigned int ip; 1184 int val; 1185 1186 p = *ptr; 1187 ip = 0; 1188 if (((val = getdec(&p)) < 0) || (val > 255)) 1189 return 0; 1190 ip = val << 24; 1191 if (*p != '.') 1192 return 0; 1193 p++; 1194 if (((val = getdec(&p)) < 0) || (val > 255)) 1195 return 0; 1196 ip |= (val << 16); 1197 if (*p != '.') 1198 return 0; 1199 p++; 1200 if (((val = getdec(&p)) < 0) || (val > 255)) 1201 return 0; 1202 ip |= (val << 8); 1203 if (*p != '.') 1204 return 0; 1205 p++; 1206 if (((val = getdec(&p)) < 0) || (val > 255)) 1207 return 0; 1208 ip |= val; 1209 1210 addr->s_addr = htonl(ip); 1211 *ptr = p; 1212 return 1; 1213 } 1214 1215 static int 1216 getdec(char **ptr) 1217 { 1218 char *p; 1219 int ret; 1220 1221 p = *ptr; 1222 ret = 0; 1223 if ((*p < '') || (*p > '9')) 1224 return -1; 1225 while ((*p >= '') && (*p <= '9')) { 1226 ret = ret * 10 + (*p - ''); 1227 p++; 1228 } 1229 *ptr = p; 1230 return ret; 1231 } 1232 1233 static void 1234 mountopts(struct nfs_args *args, char *p) 1235 { 1236 args->version = NFS_ARGSVERSION; 1237 args->rsize = 8192; 1238 args->wsize = 8192; 1239 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 1240 args->sotype = SOCK_DGRAM; 1241 if (p != NULL) 1242 nfs_parse_options(p, args); 1243 } 1244 1245 static int 1246 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 1247 { 1248 struct mbuf *m; 1249 int alignedlen; 1250 1251 m = *mptr; 1252 alignedlen = ( len + 3 ) & ~3; 1253 1254 if (m->m_len < alignedlen) { 1255 m = m_pullup(m, alignedlen); 1256 if (m == NULL) { 1257 *mptr = NULL; 1258 return EBADRPC; 1259 } 1260 } 1261 bcopy(mtod(m, u_char *), buf, len); 1262 m_adj(m, alignedlen); 1263 *mptr = m; 1264 return 0; 1265 } 1266 1267 static int 1268 xdr_int_decode(struct mbuf **mptr, int *iptr) 1269 { 1270 u_int32_t i; 1271 1272 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 1273 return EBADRPC; 1274 *iptr = fxdr_unsigned(u_int32_t, i); 1275 return 0; 1276 } 1277 1278 static void 1279 print_sin_addr(struct sockaddr_in *sin) 1280 { 1281 1282 print_in_addr(sin->sin_addr); 1283 } 1284 1285 static void 1286 print_in_addr(struct in_addr addr) 1287 { 1288 unsigned int ip; 1289 1290 ip = ntohl(addr.s_addr); 1291 printf("%d.%d.%d.%d", 1292 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); 1293 } 1294 1295 static void 1296 bootpc_compose_query(struct bootpc_ifcontext *ifctx, 1297 struct bootpc_globalcontext *gctx, struct thread *td) 1298 { 1299 unsigned char *vendp; 1300 unsigned char vendor_client[64]; 1301 uint32_t leasetime; 1302 uint8_t vendor_client_len; 1303 1304 ifctx->gotrootpath = 0; 1305 1306 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call)); 1307 1308 /* bootpc part */ 1309 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */ 1310 ifctx->call.htype = 1; /* 10mb ethernet */ 1311 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */ 1312 ifctx->call.hops = 0; 1313 if (bootpc_ifctx_isunresolved(ifctx) != 0) 1314 ifctx->xid++; 1315 ifctx->call.xid = txdr_unsigned(ifctx->xid); 1316 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); 1317 1318 vendp = ifctx->call.vend; 1319 *vendp++ = 99; /* RFC1048 cookie */ 1320 *vendp++ = 130; 1321 *vendp++ = 83; 1322 *vendp++ = 99; 1323 *vendp++ = TAG_MAXMSGSIZE; 1324 *vendp++ = 2; 1325 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; 1326 *vendp++ = sizeof(struct bootp_packet) & 255; 1327 1328 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", 1329 ostype, MACHINE, osrelease); 1330 vendor_client_len = strlen(vendor_client); 1331 *vendp++ = TAG_VENDOR_INDENTIFIER; 1332 *vendp++ = vendor_client_len; 1333 memcpy(vendp, vendor_client, vendor_client_len); 1334 vendp += vendor_client_len;; 1335 ifctx->dhcpquerytype = DHCP_NOMSG; 1336 switch (ifctx->state) { 1337 case IF_DHCP_UNRESOLVED: 1338 *vendp++ = TAG_DHCP_MSGTYPE; 1339 *vendp++ = 1; 1340 *vendp++ = DHCP_DISCOVER; 1341 ifctx->dhcpquerytype = DHCP_DISCOVER; 1342 ifctx->gotdhcpserver = 0; 1343 break; 1344 case IF_DHCP_OFFERED: 1345 *vendp++ = TAG_DHCP_MSGTYPE; 1346 *vendp++ = 1; 1347 *vendp++ = DHCP_REQUEST; 1348 ifctx->dhcpquerytype = DHCP_REQUEST; 1349 *vendp++ = TAG_DHCP_REQ_ADDR; 1350 *vendp++ = 4; 1351 memcpy(vendp, &ifctx->reply.yiaddr, 4); 1352 vendp += 4; 1353 if (ifctx->gotdhcpserver != 0) { 1354 *vendp++ = TAG_DHCP_SERVERID; 1355 *vendp++ = 4; 1356 memcpy(vendp, &ifctx->dhcpserver, 4); 1357 vendp += 4; 1358 } 1359 *vendp++ = TAG_DHCP_LEASETIME; 1360 *vendp++ = 4; 1361 leasetime = htonl(300); 1362 memcpy(vendp, &leasetime, 4); 1363 vendp += 4; 1364 break; 1365 default: 1366 break; 1367 } 1368 *vendp = TAG_END; 1369 1370 ifctx->call.secs = 0; 1371 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */ 1372 } 1373 1374 static int 1375 bootpc_hascookie(struct bootp_packet *bp) 1376 { 1377 1378 return (bp->vend[0] == 99 && bp->vend[1] == 130 && 1379 bp->vend[2] == 83 && bp->vend[3] == 99); 1380 } 1381 1382 static void 1383 bootpc_tag_helper(struct bootpc_tagcontext *tctx, 1384 unsigned char *start, int len, int tag) 1385 { 1386 unsigned char *j; 1387 unsigned char *ej; 1388 unsigned char code; 1389 1390 if (tctx->badtag != 0 || tctx->badopt != 0) 1391 return; 1392 1393 j = start; 1394 ej = j + len; 1395 1396 while (j < ej) { 1397 code = *j++; 1398 if (code == TAG_PAD) 1399 continue; 1400 if (code == TAG_END) 1401 return; 1402 if (j >= ej || j + *j + 1 > ej) { 1403 tctx->badopt = 1; 1404 return; 1405 } 1406 len = *j++; 1407 if (code == tag) { 1408 if (tctx->taglen + len > TAG_MAXLEN) { 1409 tctx->badtag = 1; 1410 return; 1411 } 1412 tctx->foundopt = 1; 1413 if (len > 0) 1414 memcpy(tctx->buf + tctx->taglen, 1415 j, len); 1416 tctx->taglen += len; 1417 } 1418 if (code == TAG_OVERLOAD) 1419 tctx->overload = *j; 1420 1421 j += len; 1422 } 1423 } 1424 1425 static unsigned char * 1426 bootpc_tag(struct bootpc_tagcontext *tctx, 1427 struct bootp_packet *bp, int len, int tag) 1428 { 1429 tctx->overload = 0; 1430 tctx->badopt = 0; 1431 tctx->badtag = 0; 1432 tctx->foundopt = 0; 1433 tctx->taglen = 0; 1434 1435 if (bootpc_hascookie(bp) == 0) 1436 return NULL; 1437 1438 bootpc_tag_helper(tctx, &bp->vend[4], 1439 (unsigned char *) bp + len - &bp->vend[4], tag); 1440 1441 if ((tctx->overload & OVERLOAD_FILE) != 0) 1442 bootpc_tag_helper(tctx, 1443 (unsigned char *) bp->file, 1444 sizeof(bp->file), 1445 tag); 1446 if ((tctx->overload & OVERLOAD_SNAME) != 0) 1447 bootpc_tag_helper(tctx, 1448 (unsigned char *) bp->sname, 1449 sizeof(bp->sname), 1450 tag); 1451 1452 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0) 1453 return NULL; 1454 tctx->buf[tctx->taglen] = '\0'; 1455 return tctx->buf; 1456 } 1457 1458 static void 1459 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx, 1460 struct bootpc_globalcontext *gctx) 1461 { 1462 char *p; 1463 unsigned int ip; 1464 1465 ifctx->gotgw = 0; 1466 ifctx->gotnetmask = 0; 1467 1468 clear_sinaddr(&ifctx->myaddr); 1469 clear_sinaddr(&ifctx->netmask); 1470 clear_sinaddr(&ifctx->gw); 1471 1472 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1473 1474 ip = ntohl(ifctx->myaddr.sin_addr.s_addr); 1475 1476 printf("%s at ", ifctx->ireq.ifr_name); 1477 print_sin_addr(&ifctx->myaddr); 1478 printf(" server "); 1479 print_in_addr(ifctx->reply.siaddr); 1480 1481 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1482 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1483 printf(" via gateway "); 1484 print_in_addr(ifctx->reply.giaddr); 1485 } 1486 1487 /* This call used for the side effect (overload flag) */ 1488 (void) bootpc_tag(&gctx->tmptag, 1489 &ifctx->reply, ifctx->replylen, TAG_END); 1490 1491 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1492 if (ifctx->reply.sname[0] != '\0') 1493 printf(" server name %s", ifctx->reply.sname); 1494 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1495 if (ifctx->reply.file[0] != '\0') 1496 printf(" boot file %s", ifctx->reply.file); 1497 1498 printf("\n"); 1499 1500 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1501 TAG_SUBNETMASK); 1502 if (p != NULL) { 1503 if (gctx->tag.taglen != 4) 1504 panic("bootpc: subnet mask len is %d", 1505 gctx->tag.taglen); 1506 bcopy(p, &ifctx->netmask.sin_addr, 4); 1507 ifctx->gotnetmask = 1; 1508 printf("subnet mask "); 1509 print_sin_addr(&ifctx->netmask); 1510 printf(" "); 1511 } 1512 1513 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1514 TAG_ROUTERS); 1515 if (p != NULL) { 1516 /* Routers */ 1517 if (gctx->tag.taglen % 4) 1518 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1519 if (gctx->tag.taglen > 0) { 1520 bcopy(p, &ifctx->gw.sin_addr, 4); 1521 printf("router "); 1522 print_sin_addr(&ifctx->gw); 1523 printf(" "); 1524 ifctx->gotgw = 1; 1525 gctx->gotgw = 1; 1526 } 1527 } 1528 1529 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1530 TAG_ROOT); 1531 if (p != NULL) { 1532 if (gctx->setrootfs != NULL) { 1533 printf("rootfs %s (ignored) ", p); 1534 } else if (setfs(&nd->root_saddr, 1535 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1536 if (*p == '/') { 1537 printf("root_server "); 1538 print_sin_addr(&nd->root_saddr); 1539 printf(" "); 1540 } 1541 printf("rootfs %s ", p); 1542 gctx->gotrootpath = 1; 1543 ifctx->gotrootpath = 1; 1544 gctx->setrootfs = ifctx; 1545 1546 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1547 ifctx->replylen, 1548 TAG_ROOTOPTS); 1549 if (p != NULL) { 1550 mountopts(&nd->root_args, p); 1551 printf("rootopts %s ", p); 1552 } 1553 } else 1554 panic("Failed to set rootfs to %s", p); 1555 } 1556 1557 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1558 TAG_HOSTNAME); 1559 if (p != NULL) { 1560 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1561 panic("bootpc: hostname >= %d bytes", 1562 MAXHOSTNAMELEN); 1563 if (gctx->sethostname != NULL) { 1564 printf("hostname %s (ignored) ", p); 1565 } else { 1566 strcpy(nd->my_hostnam, p); 1567 strcpy(hostname, p); 1568 printf("hostname %s ", hostname); 1569 gctx->sethostname = ifctx; 1570 } 1571 } 1572 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1573 TAG_COOKIE); 1574 if (p != NULL) { /* store in a sysctl variable */ 1575 int i, l = sizeof(bootp_cookie) - 1; 1576 for (i = 0; i < l && p[i] != '\0'; i++) 1577 bootp_cookie[i] = p[i]; 1578 p[i] = '\0'; 1579 } 1580 1581 1582 printf("\n"); 1583 1584 if (ifctx->gotnetmask == 0) { 1585 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1586 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1587 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1588 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1589 else 1590 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1591 } 1592 if (ifctx->gotgw == 0) { 1593 /* Use proxyarp */ 1594 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr; 1595 } 1596 } 1597 1598 void 1599 bootpc_init(void) 1600 { 1601 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */ 1602 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1603 struct ifnet *ifp; 1604 int error; 1605 #ifndef BOOTP_WIRED_TO 1606 int ifcnt; 1607 #endif 1608 struct nfsv3_diskless *nd; 1609 struct thread *td; 1610 1611 nd = &nfsv3_diskless; 1612 td = curthread; 1613 1614 /* 1615 * If already filled in, don't touch it here 1616 */ 1617 if (nfs_diskless_valid != 0) 1618 return; 1619 1620 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1621 if (gctx == NULL) 1622 panic("Failed to allocate bootp global context structure"); 1623 1624 gctx->xid = ~0xFFFF; 1625 gctx->starttime = time_second; 1626 1627 /* 1628 * Find a network interface. 1629 */ 1630 #ifdef BOOTP_WIRED_TO 1631 printf("bootpc_init: wired to interface '%s'\n", 1632 __XSTRING(BOOTP_WIRED_TO)); 1633 allocifctx(gctx); 1634 #else 1635 /* 1636 * Preallocate interface context storage, if another interface 1637 * attaches and wins the race, it won't be eligible for bootp. 1638 */ 1639 IFNET_RLOCK(); 1640 for (ifp = TAILQ_FIRST(&ifnet), ifcnt = 0; 1641 ifp != NULL; 1642 ifp = TAILQ_NEXT(ifp, if_link)) { 1643 if ((ifp->if_flags & 1644 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1645 IFF_BROADCAST) 1646 continue; 1647 ifcnt++; 1648 } 1649 IFNET_RUNLOCK(); 1650 if (ifcnt == 0) 1651 panic("bootpc_init: no eligible interfaces"); 1652 for (; ifcnt > 0; ifcnt--) 1653 allocifctx(gctx); 1654 #endif 1655 1656 IFNET_RLOCK(); 1657 for (ifp = TAILQ_FIRST(&ifnet), ifctx = gctx->interfaces; 1658 ifp != NULL && ifctx != NULL; 1659 ifp = TAILQ_NEXT(ifp, if_link)) { 1660 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1661 sizeof(ifctx->ireq.ifr_name)); 1662 #ifdef BOOTP_WIRED_TO 1663 if (strcmp(ifctx->ireq.ifr_name, 1664 __XSTRING(BOOTP_WIRED_TO)) != 0) 1665 continue; 1666 #else 1667 if ((ifp->if_flags & 1668 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1669 IFF_BROADCAST) 1670 continue; 1671 #endif 1672 ifctx->ifp = ifp; 1673 ifctx = ifctx->next; 1674 } 1675 IFNET_RUNLOCK(); 1676 1677 if (gctx->interfaces == NULL || gctx->interfaces->ifp == NULL) { 1678 #ifdef BOOTP_WIRED_TO 1679 panic("bootpc_init: Could not find interface specified " 1680 "by BOOTP_WIRED_TO: " 1681 __XSTRING(BOOTP_WIRED_TO)); 1682 #else 1683 panic("bootpc_init: no suitable interface"); 1684 #endif 1685 } 1686 1687 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1688 bootpc_fakeup_interface(ifctx, gctx, td); 1689 1690 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1691 bootpc_compose_query(ifctx, gctx, td); 1692 1693 error = bootpc_call(gctx, td); 1694 1695 if (error != 0) { 1696 #ifdef BOOTP_NFSROOT 1697 panic("BOOTP call failed"); 1698 #else 1699 printf("BOOTP call failed\n"); 1700 #endif 1701 } 1702 1703 rootdevnames[0] = "nfs:"; 1704 mountopts(&nd->root_args, NULL); 1705 1706 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1707 if (bootpc_ifctx_isresolved(ifctx) != 0) 1708 bootpc_decode_reply(nd, ifctx, gctx); 1709 1710 #ifdef BOOTP_NFSROOT 1711 if (gctx->gotrootpath == 0) 1712 panic("bootpc: No root path offered"); 1713 #endif 1714 1715 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) { 1716 bootpc_adjust_interface(ifctx, gctx, td); 1717 1718 soclose(ifctx->so); 1719 } 1720 1721 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1722 if (ifctx->gotrootpath != 0) 1723 break; 1724 if (ifctx == NULL) { 1725 for (ifctx = gctx->interfaces; 1726 ifctx != NULL; 1727 ifctx = ifctx->next) 1728 if (bootpc_ifctx_isresolved(ifctx) != 0) 1729 break; 1730 } 1731 if (ifctx == NULL) 1732 goto out; 1733 1734 if (gctx->gotrootpath != 0) { 1735 1736 setenv("boot.netif.name", ifctx->ifp->if_xname); 1737 1738 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1739 nd->root_fh, &nd->root_fhsize, 1740 &nd->root_args, td); 1741 if (error != 0) 1742 panic("nfs_boot: mountd root, error=%d", error); 1743 1744 nfs_diskless_valid = 3; 1745 } 1746 1747 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1748 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1749 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1750 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1751 ifctx->myaddr.sin_addr.s_addr | 1752 ~ ifctx->netmask.sin_addr.s_addr; 1753 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1754 1755 out: 1756 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) { 1757 nctx = ifctx->next; 1758 free(ifctx, M_TEMP); 1759 } 1760 free(gctx, M_TEMP); 1761 } 1762 1763 /* 1764 * RPC: mountd/mount 1765 * Given a server pathname, get an NFS file handle. 1766 * Also, sets sin->sin_port to the NFS service port. 1767 */ 1768 static int 1769 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1770 struct nfs_args *args, struct thread *td) 1771 { 1772 struct mbuf *m; 1773 int error; 1774 int authunixok; 1775 int authcount; 1776 int authver; 1777 1778 /* XXX honor v2/v3 flags in args->flags? */ 1779 #ifdef BOOTP_NFSV3 1780 /* First try NFS v3 */ 1781 /* Get port number for MOUNTD. */ 1782 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1783 &mdsin->sin_port, td); 1784 if (error == 0) { 1785 m = xdr_string_encode(path, strlen(path)); 1786 1787 /* Do RPC to mountd. */ 1788 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1789 RPCMNT_MOUNT, &m, NULL, td); 1790 } 1791 if (error == 0) { 1792 args->flags |= NFSMNT_NFSV3; 1793 } else { 1794 #endif 1795 /* Fallback to NFS v2 */ 1796 1797 /* Get port number for MOUNTD. */ 1798 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1799 &mdsin->sin_port, td); 1800 if (error != 0) 1801 return error; 1802 1803 m = xdr_string_encode(path, strlen(path)); 1804 1805 /* Do RPC to mountd. */ 1806 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1807 RPCMNT_MOUNT, &m, NULL, td); 1808 if (error != 0) 1809 return error; /* message already freed */ 1810 1811 #ifdef BOOTP_NFSV3 1812 } 1813 #endif 1814 1815 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1816 goto bad; 1817 1818 if ((args->flags & NFSMNT_NFSV3) != 0) { 1819 if (xdr_int_decode(&m, fhsizep) != 0 || 1820 *fhsizep > NFSX_V3FHMAX || 1821 *fhsizep <= 0) 1822 goto bad; 1823 } else 1824 *fhsizep = NFSX_V2FH; 1825 1826 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1827 goto bad; 1828 1829 if (args->flags & NFSMNT_NFSV3) { 1830 if (xdr_int_decode(&m, &authcount) != 0) 1831 goto bad; 1832 authunixok = 0; 1833 if (authcount < 0 || authcount > 100) 1834 goto bad; 1835 while (authcount > 0) { 1836 if (xdr_int_decode(&m, &authver) != 0) 1837 goto bad; 1838 if (authver == RPCAUTH_UNIX) 1839 authunixok = 1; 1840 authcount--; 1841 } 1842 if (authunixok == 0) 1843 goto bad; 1844 } 1845 1846 /* Set port number for NFS use. */ 1847 error = krpc_portmap(mdsin, NFS_PROG, 1848 (args->flags & 1849 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1850 &mdsin->sin_port, td); 1851 1852 goto out; 1853 1854 bad: 1855 error = EBADRPC; 1856 1857 out: 1858 m_freem(m); 1859 return error; 1860 } 1861 1862 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
Cache object: 04bff1ee3c11f453868df7f2406d4c96
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