Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/nfs/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 #include "opt_nfs.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/jail.h> 52 #include <sys/kernel.h> 53 #include <sys/sockio.h> 54 #include <sys/malloc.h> 55 #include <sys/mount.h> 56 #include <sys/mbuf.h> 57 #include <sys/proc.h> 58 #include <sys/socket.h> 59 #include <sys/socketvar.h> 60 #include <sys/sysctl.h> 61 #include <sys/uio.h> 62 63 #include <net/if.h> 64 #include <net/route.h> 65 66 #include <netinet/in.h> 67 #include <net/if_types.h> 68 #include <net/if_dl.h> 69 #include <net/vnet.h> 70 71 #include <nfs/nfsproto.h> 72 #include <nfsclient/nfs.h> 73 #include <nfs/nfsdiskless.h> 74 #include <nfs/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 /* NFS read/write block size */ 213 #ifndef BOOTP_BLOCKSIZE 214 #define BOOTP_BLOCKSIZE 8192 215 #endif 216 217 static char bootp_cookie[128]; 218 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, 219 bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); 220 221 /* mountd RPC */ 222 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, 223 int *fhsizep, struct nfs_args *args, struct thread *td); 224 static int setfs(struct sockaddr_in *addr, char *path, char *p, 225 const struct in_addr *siaddr); 226 static int getdec(char **ptr); 227 static int getip(char **ptr, struct in_addr *ip); 228 static void mountopts(struct nfs_args *args, char *p); 229 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 230 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 231 static void print_in_addr(struct in_addr addr); 232 static void print_sin_addr(struct sockaddr_in *addr); 233 static void clear_sinaddr(struct sockaddr_in *sin); 234 static void allocifctx(struct bootpc_globalcontext *gctx); 235 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx, 236 struct bootpc_globalcontext *gctx, struct thread *td); 237 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx, 238 struct bootp_packet *bp, int len, int tag); 239 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx, 240 unsigned char *start, int len, int tag); 241 242 #ifdef BOOTP_DEBUG 243 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma); 244 void bootpboot_p_rtentry(struct rtentry *rt); 245 void bootpboot_p_tree(struct radix_node *rn); 246 void bootpboot_p_rtlist(void); 247 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa); 248 void bootpboot_p_iflist(void); 249 #endif 250 251 static int bootpc_call(struct bootpc_globalcontext *gctx, 252 struct thread *td); 253 254 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 255 struct bootpc_globalcontext *gctx, struct thread *td); 256 257 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 258 struct bootpc_globalcontext *gctx, struct thread *td); 259 260 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 261 struct bootpc_ifcontext *ifctx, 262 struct bootpc_globalcontext *gctx); 263 264 static int bootpc_received(struct bootpc_globalcontext *gctx, 265 struct bootpc_ifcontext *ifctx); 266 267 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 268 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 269 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 270 271 /* 272 * In order to have multiple active interfaces with address 0.0.0.0 273 * and be able to send data to a selected interface, we perform 274 * some tricks: 275 * 276 * - The 'broadcast' address is different for each interface. 277 * 278 * - We temporarily add routing pointing 255.255.255.255 to the 279 * selected interface broadcast address, thus the packet sent 280 * goes to that interface. 281 */ 282 283 #ifdef BOOTP_DEBUG 284 void 285 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma) 286 { 287 288 if (sa == NULL) { 289 printf("(sockaddr *) <null>"); 290 return; 291 } 292 switch (sa->sa_family) { 293 case AF_INET: 294 { 295 struct sockaddr_in *sin; 296 297 sin = (struct sockaddr_in *) sa; 298 printf("inet "); 299 print_sin_addr(sin); 300 if (ma != NULL) { 301 sin = (struct sockaddr_in *) ma; 302 printf(" mask "); 303 print_sin_addr(sin); 304 } 305 } 306 break; 307 case AF_LINK: 308 { 309 struct sockaddr_dl *sli; 310 int i; 311 312 sli = (struct sockaddr_dl *) sa; 313 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data); 314 for (i = 0; i < sli->sdl_alen; i++) { 315 if (i > 0) 316 printf(":"); 317 printf("%x", ((unsigned char *) LLADDR(sli))[i]); 318 } 319 } 320 break; 321 default: 322 printf("af%d", sa->sa_family); 323 } 324 } 325 326 void 327 bootpboot_p_rtentry(struct rtentry *rt) 328 { 329 330 bootpboot_p_sa(rt_key(rt), rt_mask(rt)); 331 printf(" "); 332 bootpboot_p_sa(rt->rt_gateway, NULL); 333 printf(" "); 334 printf("flags %x", (unsigned short) rt->rt_flags); 335 printf(" %d", (int) rt->rt_rmx.rmx_expire); 336 printf(" %s\n", rt->rt_ifp->if_xname); 337 } 338 339 void 340 bootpboot_p_tree(struct radix_node *rn) 341 { 342 343 while (rn != NULL) { 344 if (rn->rn_bit < 0) { 345 if ((rn->rn_flags & RNF_ROOT) != 0) { 346 } else { 347 bootpboot_p_rtentry((struct rtentry *) rn); 348 } 349 rn = rn->rn_dupedkey; 350 } else { 351 bootpboot_p_tree(rn->rn_left); 352 bootpboot_p_tree(rn->rn_right); 353 return; 354 } 355 } 356 } 357 358 void 359 bootpboot_p_rtlist(void) 360 { 361 struct radix_node_head *rnh; 362 363 printf("Routing table:\n"); 364 rnh = rt_tables_get_rnh(0, AF_INET); 365 if (rnh == NULL) 366 return; 367 RADIX_NODE_HEAD_RLOCK(rnh); /* could sleep XXX */ 368 bootpboot_p_tree(rnh->rnh_treetop); 369 RADIX_NODE_HEAD_RUNLOCK(rnh); 370 } 371 372 void 373 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 374 { 375 376 printf("%s flags %x, addr ", 377 ifp->if_xname, ifp->if_flags); 378 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 379 printf(", broadcast "); 380 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 381 printf(", netmask "); 382 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 383 printf("\n"); 384 } 385 386 void 387 bootpboot_p_iflist(void) 388 { 389 struct ifnet *ifp; 390 struct ifaddr *ifa; 391 392 printf("Interface list:\n"); 393 IFNET_RLOCK(); 394 for (ifp = TAILQ_FIRST(&V_ifnet); 395 ifp != NULL; 396 ifp = TAILQ_NEXT(ifp, if_link)) { 397 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); 398 ifa != NULL; 399 ifa = TAILQ_NEXT(ifa, ifa_link)) 400 if (ifa->ifa_addr->sa_family == AF_INET) 401 bootpboot_p_if(ifp, ifa); 402 } 403 IFNET_RUNLOCK(); 404 } 405 #endif /* defined(BOOTP_DEBUG) */ 406 407 static void 408 clear_sinaddr(struct sockaddr_in *sin) 409 { 410 411 bzero(sin, sizeof(*sin)); 412 sin->sin_len = sizeof(*sin); 413 sin->sin_family = AF_INET; 414 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 415 sin->sin_port = 0; 416 } 417 418 static void 419 allocifctx(struct bootpc_globalcontext *gctx) 420 { 421 struct bootpc_ifcontext *ifctx; 422 ifctx = (struct bootpc_ifcontext *) malloc(sizeof(*ifctx), 423 M_TEMP, M_WAITOK | M_ZERO); 424 if (ifctx == NULL) 425 panic("Failed to allocate bootp interface context structure"); 426 427 ifctx->xid = gctx->xid; 428 #ifdef BOOTP_NO_DHCP 429 ifctx->state = IF_BOOTP_UNRESOLVED; 430 #else 431 ifctx->state = IF_DHCP_UNRESOLVED; 432 #endif 433 gctx->xid += 0x100; 434 if (gctx->interfaces != NULL) 435 gctx->lastinterface->next = ifctx; 436 else 437 gctx->interfaces = ifctx; 438 gctx->lastinterface = ifctx; 439 } 440 441 static __inline int 442 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 443 { 444 445 if (ifctx->state == IF_BOOTP_RESOLVED || 446 ifctx->state == IF_DHCP_RESOLVED) 447 return 1; 448 return 0; 449 } 450 451 static __inline int 452 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 453 { 454 455 if (ifctx->state == IF_BOOTP_UNRESOLVED || 456 ifctx->state == IF_DHCP_UNRESOLVED) 457 return 1; 458 return 0; 459 } 460 461 static __inline int 462 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 463 { 464 465 if (ifctx->state == IF_BOOTP_FAILED || 466 ifctx->state == IF_DHCP_FAILED) 467 return 1; 468 return 0; 469 } 470 471 static int 472 bootpc_received(struct bootpc_globalcontext *gctx, 473 struct bootpc_ifcontext *ifctx) 474 { 475 unsigned char dhcpreplytype; 476 char *p; 477 478 /* 479 * Need timeout for fallback to less 480 * desirable alternative. 481 */ 482 483 /* This call used for the side effect (badopt flag) */ 484 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 485 gctx->replylen, 486 TAG_END); 487 488 /* If packet is invalid, ignore it */ 489 if (gctx->tmptag.badopt != 0) 490 return 0; 491 492 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 493 gctx->replylen, TAG_DHCP_MSGTYPE); 494 if (p != NULL) 495 dhcpreplytype = *p; 496 else 497 dhcpreplytype = DHCP_NOMSG; 498 499 switch (ifctx->dhcpquerytype) { 500 case DHCP_DISCOVER: 501 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 502 #ifndef BOOTP_FORCE_DHCP 503 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 504 #endif 505 ) 506 return 0; 507 break; 508 case DHCP_REQUEST: 509 if (dhcpreplytype != DHCP_ACK) 510 return 0; 511 case DHCP_NOMSG: 512 break; 513 } 514 515 /* Ignore packet unless it gives us a root tag we didn't have */ 516 517 if ((ifctx->state == IF_BOOTP_RESOLVED || 518 (ifctx->dhcpquerytype == DHCP_DISCOVER && 519 (ifctx->state == IF_DHCP_OFFERED || 520 ifctx->state == IF_DHCP_RESOLVED))) && 521 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 522 ifctx->replylen, 523 TAG_ROOT) != NULL || 524 bootpc_tag(&gctx->tmptag, &gctx->reply, 525 gctx->replylen, 526 TAG_ROOT) == NULL)) 527 return 0; 528 529 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 530 ifctx->replylen = gctx->replylen; 531 532 /* XXX: Only reset if 'perfect' response */ 533 if (ifctx->state == IF_BOOTP_UNRESOLVED) 534 ifctx->state = IF_BOOTP_RESOLVED; 535 else if (ifctx->state == IF_DHCP_UNRESOLVED && 536 ifctx->dhcpquerytype == DHCP_DISCOVER) { 537 if (dhcpreplytype == DHCP_OFFER) 538 ifctx->state = IF_DHCP_OFFERED; 539 else 540 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 541 } else if (ifctx->state == IF_DHCP_OFFERED && 542 ifctx->dhcpquerytype == DHCP_REQUEST) 543 ifctx->state = IF_DHCP_RESOLVED; 544 545 546 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 547 ifctx->state != IF_BOOTP_RESOLVED) { 548 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 549 ifctx->replylen, TAG_DHCP_SERVERID); 550 if (p != NULL && gctx->tmptag.taglen == 4) { 551 memcpy(&ifctx->dhcpserver, p, 4); 552 ifctx->gotdhcpserver = 1; 553 } else 554 ifctx->gotdhcpserver = 0; 555 return 1; 556 } 557 558 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 559 ifctx->replylen, 560 TAG_ROOT) != NULL); 561 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 562 ifctx->replylen, 563 TAG_ROUTERS) != NULL); 564 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 565 ifctx->replylen, 566 TAG_SUBNETMASK) != NULL); 567 return 1; 568 } 569 570 static int 571 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 572 { 573 struct socket *so; 574 struct sockaddr_in *sin, dst; 575 struct uio auio; 576 struct sockopt sopt; 577 struct iovec aio; 578 int error, on, rcvflg, timo, len; 579 time_t atimo; 580 time_t rtimo; 581 struct timeval tv; 582 struct bootpc_ifcontext *ifctx; 583 int outstanding; 584 int gotrootpath; 585 int retry; 586 const char *s; 587 588 /* 589 * Create socket and set its recieve timeout. 590 */ 591 error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td->td_ucred, td); 592 if (error != 0) 593 goto out0; 594 595 tv.tv_sec = 1; 596 tv.tv_usec = 0; 597 bzero(&sopt, sizeof(sopt)); 598 sopt.sopt_dir = SOPT_SET; 599 sopt.sopt_level = SOL_SOCKET; 600 sopt.sopt_name = SO_RCVTIMEO; 601 sopt.sopt_val = &tv; 602 sopt.sopt_valsize = sizeof tv; 603 604 error = sosetopt(so, &sopt); 605 if (error != 0) 606 goto out; 607 608 /* 609 * Enable broadcast. 610 */ 611 on = 1; 612 sopt.sopt_name = SO_BROADCAST; 613 sopt.sopt_val = &on; 614 sopt.sopt_valsize = sizeof on; 615 616 error = sosetopt(so, &sopt); 617 if (error != 0) 618 goto out; 619 620 /* 621 * Disable routing. 622 */ 623 624 on = 1; 625 sopt.sopt_name = SO_DONTROUTE; 626 sopt.sopt_val = &on; 627 sopt.sopt_valsize = sizeof on; 628 629 error = sosetopt(so, &sopt); 630 if (error != 0) 631 goto out; 632 633 /* 634 * Bind the local endpoint to a bootp client port. 635 */ 636 sin = &dst; 637 clear_sinaddr(sin); 638 sin->sin_port = htons(IPPORT_BOOTPC); 639 error = sobind(so, (struct sockaddr *)sin, td); 640 if (error != 0) { 641 printf("bind failed\n"); 642 goto out; 643 } 644 645 /* 646 * Setup socket address for the server. 647 */ 648 sin = &dst; 649 clear_sinaddr(sin); 650 sin->sin_addr.s_addr = INADDR_BROADCAST; 651 sin->sin_port = htons(IPPORT_BOOTPS); 652 653 /* 654 * Send it, repeatedly, until a reply is received, 655 * but delay each re-send by an increasing amount. 656 * If the delay hits the maximum, start complaining. 657 */ 658 timo = 0; 659 rtimo = 0; 660 for (;;) { 661 662 outstanding = 0; 663 gotrootpath = 0; 664 665 for (ifctx = gctx->interfaces; 666 ifctx != NULL; 667 ifctx = ifctx->next) { 668 if (bootpc_ifctx_isresolved(ifctx) != 0 && 669 bootpc_tag(&gctx->tmptag, &ifctx->reply, 670 ifctx->replylen, 671 TAG_ROOT) != NULL) 672 gotrootpath = 1; 673 } 674 675 for (ifctx = gctx->interfaces; 676 ifctx != NULL; 677 ifctx = ifctx->next) { 678 ifctx->outstanding = 0; 679 if (bootpc_ifctx_isresolved(ifctx) != 0 && 680 gotrootpath != 0) { 681 continue; 682 } 683 if (bootpc_ifctx_isfailed(ifctx) != 0) 684 continue; 685 686 outstanding++; 687 ifctx->outstanding = 1; 688 689 /* Proceed to next step in DHCP negotiation */ 690 if ((ifctx->state == IF_DHCP_OFFERED && 691 ifctx->dhcpquerytype != DHCP_REQUEST) || 692 (ifctx->state == IF_DHCP_UNRESOLVED && 693 ifctx->dhcpquerytype != DHCP_DISCOVER) || 694 (ifctx->state == IF_BOOTP_UNRESOLVED && 695 ifctx->dhcpquerytype != DHCP_NOMSG)) { 696 ifctx->sentmsg = 0; 697 bootpc_compose_query(ifctx, gctx, td); 698 } 699 700 /* Send BOOTP request (or re-send). */ 701 702 if (ifctx->sentmsg == 0) { 703 switch(ifctx->dhcpquerytype) { 704 case DHCP_DISCOVER: 705 s = "DHCP Discover"; 706 break; 707 case DHCP_REQUEST: 708 s = "DHCP Request"; 709 break; 710 case DHCP_NOMSG: 711 default: 712 s = "BOOTP Query"; 713 break; 714 } 715 printf("Sending %s packet from " 716 "interface %s (%*D)\n", 717 s, 718 ifctx->ireq.ifr_name, 719 ifctx->sdl->sdl_alen, 720 (unsigned char *) LLADDR(ifctx->sdl), 721 ":"); 722 ifctx->sentmsg = 1; 723 } 724 725 aio.iov_base = (caddr_t) &ifctx->call; 726 aio.iov_len = sizeof(ifctx->call); 727 728 auio.uio_iov = &aio; 729 auio.uio_iovcnt = 1; 730 auio.uio_segflg = UIO_SYSSPACE; 731 auio.uio_rw = UIO_WRITE; 732 auio.uio_offset = 0; 733 auio.uio_resid = sizeof(ifctx->call); 734 auio.uio_td = td; 735 736 /* Set netmask to 0.0.0.0 */ 737 738 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr; 739 clear_sinaddr(sin); 740 error = ifioctl(ifctx->so, SIOCSIFNETMASK, 741 (caddr_t) &ifctx->ireq, td); 742 if (error != 0) 743 panic("bootpc_call:" 744 "set if netmask, error=%d", 745 error); 746 747 error = sosend(so, (struct sockaddr *) &dst, 748 &auio, NULL, NULL, 0, td); 749 if (error != 0) { 750 printf("bootpc_call: sosend: %d state %08x\n", 751 error, (int) so->so_state); 752 } 753 754 /* XXX: Is this needed ? */ 755 pause("bootpw", hz/10); 756 757 /* Set netmask to 255.0.0.0 */ 758 759 sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr; 760 clear_sinaddr(sin); 761 sin->sin_addr.s_addr = htonl(0xff000000u); 762 error = ifioctl(ifctx->so, SIOCSIFNETMASK, 763 (caddr_t) &ifctx->ireq, td); 764 if (error != 0) 765 panic("bootpc_call:" 766 "set if netmask, error=%d", 767 error); 768 769 } 770 771 if (outstanding == 0 && 772 (rtimo == 0 || time_second >= rtimo)) { 773 error = 0; 774 goto gotreply; 775 } 776 777 /* Determine new timeout. */ 778 if (timo < MAX_RESEND_DELAY) 779 timo++; 780 else { 781 printf("DHCP/BOOTP timeout for server "); 782 print_sin_addr(&dst); 783 printf("\n"); 784 } 785 786 /* 787 * Wait for up to timo seconds for a reply. 788 * The socket receive timeout was set to 1 second. 789 */ 790 atimo = timo + time_second; 791 while (time_second < atimo) { 792 aio.iov_base = (caddr_t) &gctx->reply; 793 aio.iov_len = sizeof(gctx->reply); 794 795 auio.uio_iov = &aio; 796 auio.uio_iovcnt = 1; 797 auio.uio_segflg = UIO_SYSSPACE; 798 auio.uio_rw = UIO_READ; 799 auio.uio_offset = 0; 800 auio.uio_resid = sizeof(gctx->reply); 801 auio.uio_td = td; 802 803 rcvflg = 0; 804 error = soreceive(so, NULL, &auio, 805 NULL, NULL, &rcvflg); 806 gctx->secs = time_second - gctx->starttime; 807 for (ifctx = gctx->interfaces; 808 ifctx != NULL; 809 ifctx = ifctx->next) { 810 if (bootpc_ifctx_isresolved(ifctx) != 0 || 811 bootpc_ifctx_isfailed(ifctx) != 0) 812 continue; 813 814 ifctx->call.secs = htons(gctx->secs); 815 } 816 if (error == EWOULDBLOCK) 817 continue; 818 if (error != 0) 819 goto out; 820 len = sizeof(gctx->reply) - auio.uio_resid; 821 822 /* Do we have the required number of bytes ? */ 823 if (len < BOOTP_MIN_LEN) 824 continue; 825 gctx->replylen = len; 826 827 /* Is it a reply? */ 828 if (gctx->reply.op != BOOTP_REPLY) 829 continue; 830 831 /* Is this an answer to our query */ 832 for (ifctx = gctx->interfaces; 833 ifctx != NULL; 834 ifctx = ifctx->next) { 835 if (gctx->reply.xid != ifctx->call.xid) 836 continue; 837 838 /* Same HW address size ? */ 839 if (gctx->reply.hlen != ifctx->call.hlen) 840 continue; 841 842 /* Correct HW address ? */ 843 if (bcmp(gctx->reply.chaddr, 844 ifctx->call.chaddr, 845 ifctx->call.hlen) != 0) 846 continue; 847 848 break; 849 } 850 851 if (ifctx != NULL) { 852 s = bootpc_tag(&gctx->tmptag, 853 &gctx->reply, 854 gctx->replylen, 855 TAG_DHCP_MSGTYPE); 856 if (s != NULL) { 857 switch (*s) { 858 case DHCP_OFFER: 859 s = "DHCP Offer"; 860 break; 861 case DHCP_ACK: 862 s = "DHCP Ack"; 863 break; 864 default: 865 s = "DHCP (unexpected)"; 866 break; 867 } 868 } else 869 s = "BOOTP Reply"; 870 871 printf("Received %s packet" 872 " on %s from ", 873 s, 874 ifctx->ireq.ifr_name); 875 print_in_addr(gctx->reply.siaddr); 876 if (gctx->reply.giaddr.s_addr != 877 htonl(INADDR_ANY)) { 878 printf(" via "); 879 print_in_addr(gctx->reply.giaddr); 880 } 881 if (bootpc_received(gctx, ifctx) != 0) { 882 printf(" (accepted)"); 883 if (ifctx->outstanding) { 884 ifctx->outstanding = 0; 885 outstanding--; 886 } 887 /* Network settle delay */ 888 if (outstanding == 0) 889 atimo = time_second + 890 BOOTP_SETTLE_DELAY; 891 } else 892 printf(" (ignored)"); 893 if (ifctx->gotrootpath) { 894 gotrootpath = 1; 895 rtimo = time_second + 896 BOOTP_SETTLE_DELAY; 897 printf(" (got root path)"); 898 } else 899 printf(" (no root path)"); 900 printf("\n"); 901 } 902 } /* while secs */ 903 #ifdef BOOTP_TIMEOUT 904 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0) 905 break; 906 #endif 907 /* Force a retry if halfway in DHCP negotiation */ 908 retry = 0; 909 for (ifctx = gctx->interfaces; ifctx != NULL; 910 ifctx = ifctx->next) { 911 if (ifctx->state == IF_DHCP_OFFERED) { 912 if (ifctx->dhcpquerytype == DHCP_DISCOVER) 913 retry = 1; 914 else 915 ifctx->state = IF_DHCP_UNRESOLVED; 916 } 917 } 918 919 if (retry != 0) 920 continue; 921 922 if (gotrootpath != 0) { 923 gctx->gotrootpath = gotrootpath; 924 if (rtimo != 0 && time_second >= rtimo) 925 break; 926 } 927 } /* forever send/receive */ 928 929 /* 930 * XXX: These are errors of varying seriousness being silently 931 * ignored 932 */ 933 934 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) { 935 if (bootpc_ifctx_isresolved(ifctx) == 0) { 936 printf("%s timeout for interface %s\n", 937 ifctx->dhcpquerytype != DHCP_NOMSG ? 938 "DHCP" : "BOOTP", 939 ifctx->ireq.ifr_name); 940 } 941 } 942 if (gctx->gotrootpath != 0) { 943 #if 0 944 printf("Got a root path, ignoring remaining timeout\n"); 945 #endif 946 error = 0; 947 goto out; 948 } 949 #ifndef BOOTP_NFSROOT 950 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) { 951 if (bootpc_ifctx_isresolved(ifctx) != 0) { 952 error = 0; 953 goto out; 954 } 955 } 956 #endif 957 error = ETIMEDOUT; 958 goto out; 959 960 gotreply: 961 out: 962 soclose(so); 963 out0: 964 return error; 965 } 966 967 static int 968 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 969 struct bootpc_globalcontext *gctx, struct thread *td) 970 { 971 struct sockaddr_in *sin; 972 int error; 973 struct ifreq *ireq; 974 struct socket *so; 975 struct ifaddr *ifa; 976 struct sockaddr_dl *sdl; 977 978 error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td); 979 if (error != 0) 980 panic("nfs_boot: socreate, error=%d", error); 981 982 ireq = &ifctx->ireq; 983 so = ifctx->so; 984 985 /* 986 * Bring up the interface. 987 * 988 * Get the old interface flags and or IFF_UP into them; if 989 * IFF_UP set blindly, interface selection can be clobbered. 990 */ 991 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td); 992 if (error != 0) 993 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error); 994 ireq->ifr_flags |= IFF_UP; 995 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td); 996 if (error != 0) 997 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error); 998 999 /* 1000 * Do enough of ifconfig(8) so that the chosen interface 1001 * can talk to the servers. (just set the address) 1002 */ 1003 1004 /* addr is 0.0.0.0 */ 1005 1006 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1007 clear_sinaddr(sin); 1008 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td); 1009 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces)) 1010 panic("bootpc_fakeup_interface: " 1011 "set if addr, error=%d", error); 1012 1013 /* netmask is 255.0.0.0 */ 1014 1015 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1016 clear_sinaddr(sin); 1017 sin->sin_addr.s_addr = htonl(0xff000000u); 1018 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, td); 1019 if (error != 0) 1020 panic("bootpc_fakeup_interface: set if netmask, error=%d", 1021 error); 1022 1023 /* Broadcast is 255.255.255.255 */ 1024 1025 sin = (struct sockaddr_in *)&ireq->ifr_addr; 1026 clear_sinaddr(sin); 1027 clear_sinaddr(&ifctx->broadcast); 1028 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST); 1029 ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr; 1030 1031 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, td); 1032 if (error != 0) 1033 panic("bootpc_fakeup_interface: " 1034 "set if broadcast addr, error=%d", 1035 error); 1036 1037 /* Get HW address */ 1038 1039 sdl = NULL; 1040 TAILQ_FOREACH(ifa, &ifctx->ifp->if_addrhead, ifa_link) 1041 if (ifa->ifa_addr->sa_family == AF_LINK) { 1042 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1043 if (sdl->sdl_type == IFT_ETHER) 1044 break; 1045 } 1046 1047 if (sdl == NULL) 1048 panic("bootpc: Unable to find HW address for %s", 1049 ifctx->ireq.ifr_name); 1050 ifctx->sdl = sdl; 1051 1052 return error; 1053 } 1054 1055 1056 static int 1057 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 1058 struct bootpc_globalcontext *gctx, struct thread *td) 1059 { 1060 int error; 1061 struct sockaddr_in defdst; 1062 struct sockaddr_in defmask; 1063 struct sockaddr_in *sin; 1064 struct ifreq *ireq; 1065 struct socket *so; 1066 struct sockaddr_in *myaddr; 1067 struct sockaddr_in *netmask; 1068 struct sockaddr_in *gw; 1069 1070 ireq = &ifctx->ireq; 1071 so = ifctx->so; 1072 myaddr = &ifctx->myaddr; 1073 netmask = &ifctx->netmask; 1074 gw = &ifctx->gw; 1075 1076 if (bootpc_ifctx_isresolved(ifctx) == 0) { 1077 1078 /* Shutdown interfaces where BOOTP failed */ 1079 1080 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); 1081 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, td); 1082 if (error != 0) 1083 panic("bootpc_adjust_interface: " 1084 "SIOCGIFFLAGS, error=%d", error); 1085 ireq->ifr_flags &= ~IFF_UP; 1086 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, td); 1087 if (error != 0) 1088 panic("bootpc_adjust_interface: " 1089 "SIOCSIFFLAGS, error=%d", error); 1090 1091 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1092 clear_sinaddr(sin); 1093 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, td); 1094 if (error != 0 && (error != EEXIST || 1095 ifctx == gctx->interfaces)) 1096 panic("bootpc_adjust_interface: " 1097 "SIOCDIFADDR, error=%d", error); 1098 1099 return 0; 1100 } 1101 1102 printf("Adjusted interface %s\n", ifctx->ireq.ifr_name); 1103 /* 1104 * Do enough of ifconfig(8) so that the chosen interface 1105 * can talk to the servers. (just set the address) 1106 */ 1107 bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask)); 1108 error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, td); 1109 if (error != 0) 1110 panic("bootpc_adjust_interface: " 1111 "set if netmask, error=%d", error); 1112 1113 /* Broadcast is with host part of IP address all 1's */ 1114 1115 sin = (struct sockaddr_in *) &ireq->ifr_addr; 1116 clear_sinaddr(sin); 1117 sin->sin_addr.s_addr = myaddr->sin_addr.s_addr | 1118 ~ netmask->sin_addr.s_addr; 1119 error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, td); 1120 if (error != 0) 1121 panic("bootpc_adjust_interface: " 1122 "set if broadcast addr, error=%d", error); 1123 1124 bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr)); 1125 error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, td); 1126 if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces)) 1127 panic("bootpc_adjust_interface: " 1128 "set if addr, error=%d", error); 1129 1130 /* Add new default route */ 1131 1132 if (ifctx->gotgw != 0 || gctx->gotgw == 0) { 1133 clear_sinaddr(&defdst); 1134 clear_sinaddr(&defmask); 1135 /* XXX MRT just table 0 */ 1136 error = rtrequest_fib(RTM_ADD, 1137 (struct sockaddr *) &defdst, (struct sockaddr *) gw, 1138 (struct sockaddr *) &defmask, 1139 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB); 1140 if (error != 0) { 1141 printf("bootpc_adjust_interface: " 1142 "add net route, error=%d\n", error); 1143 return error; 1144 } 1145 } 1146 1147 return 0; 1148 } 1149 1150 static int 1151 setfs(struct sockaddr_in *addr, char *path, char *p, 1152 const struct in_addr *siaddr) 1153 { 1154 1155 if (getip(&p, &addr->sin_addr) == 0) { 1156 if (siaddr != NULL && *p == '/') 1157 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr)); 1158 else 1159 return 0; 1160 } else { 1161 if (*p != ':') 1162 return 0; 1163 p++; 1164 } 1165 1166 addr->sin_len = sizeof(struct sockaddr_in); 1167 addr->sin_family = AF_INET; 1168 1169 strlcpy(path, p, MNAMELEN); 1170 return 1; 1171 } 1172 1173 static int 1174 getip(char **ptr, struct in_addr *addr) 1175 { 1176 char *p; 1177 unsigned int ip; 1178 int val; 1179 1180 p = *ptr; 1181 ip = 0; 1182 if (((val = getdec(&p)) < 0) || (val > 255)) 1183 return 0; 1184 ip = val << 24; 1185 if (*p != '.') 1186 return 0; 1187 p++; 1188 if (((val = getdec(&p)) < 0) || (val > 255)) 1189 return 0; 1190 ip |= (val << 16); 1191 if (*p != '.') 1192 return 0; 1193 p++; 1194 if (((val = getdec(&p)) < 0) || (val > 255)) 1195 return 0; 1196 ip |= (val << 8); 1197 if (*p != '.') 1198 return 0; 1199 p++; 1200 if (((val = getdec(&p)) < 0) || (val > 255)) 1201 return 0; 1202 ip |= val; 1203 1204 addr->s_addr = htonl(ip); 1205 *ptr = p; 1206 return 1; 1207 } 1208 1209 static int 1210 getdec(char **ptr) 1211 { 1212 char *p; 1213 int ret; 1214 1215 p = *ptr; 1216 ret = 0; 1217 if ((*p < '') || (*p > '9')) 1218 return -1; 1219 while ((*p >= '') && (*p <= '9')) { 1220 ret = ret * 10 + (*p - ''); 1221 p++; 1222 } 1223 *ptr = p; 1224 return ret; 1225 } 1226 1227 static void 1228 mountopts(struct nfs_args *args, char *p) 1229 { 1230 args->version = NFS_ARGSVERSION; 1231 args->rsize = BOOTP_BLOCKSIZE; 1232 args->wsize = BOOTP_BLOCKSIZE; 1233 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 1234 args->sotype = SOCK_DGRAM; 1235 if (p != NULL) 1236 nfs_parse_options(p, args); 1237 } 1238 1239 static int 1240 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 1241 { 1242 struct mbuf *m; 1243 int alignedlen; 1244 1245 m = *mptr; 1246 alignedlen = ( len + 3 ) & ~3; 1247 1248 if (m->m_len < alignedlen) { 1249 m = m_pullup(m, alignedlen); 1250 if (m == NULL) { 1251 *mptr = NULL; 1252 return EBADRPC; 1253 } 1254 } 1255 bcopy(mtod(m, u_char *), buf, len); 1256 m_adj(m, alignedlen); 1257 *mptr = m; 1258 return 0; 1259 } 1260 1261 static int 1262 xdr_int_decode(struct mbuf **mptr, int *iptr) 1263 { 1264 u_int32_t i; 1265 1266 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 1267 return EBADRPC; 1268 *iptr = fxdr_unsigned(u_int32_t, i); 1269 return 0; 1270 } 1271 1272 static void 1273 print_sin_addr(struct sockaddr_in *sin) 1274 { 1275 1276 print_in_addr(sin->sin_addr); 1277 } 1278 1279 static void 1280 print_in_addr(struct in_addr addr) 1281 { 1282 unsigned int ip; 1283 1284 ip = ntohl(addr.s_addr); 1285 printf("%d.%d.%d.%d", 1286 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); 1287 } 1288 1289 static void 1290 bootpc_compose_query(struct bootpc_ifcontext *ifctx, 1291 struct bootpc_globalcontext *gctx, struct thread *td) 1292 { 1293 unsigned char *vendp; 1294 unsigned char vendor_client[64]; 1295 uint32_t leasetime; 1296 uint8_t vendor_client_len; 1297 1298 ifctx->gotrootpath = 0; 1299 1300 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call)); 1301 1302 /* bootpc part */ 1303 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */ 1304 ifctx->call.htype = 1; /* 10mb ethernet */ 1305 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */ 1306 ifctx->call.hops = 0; 1307 if (bootpc_ifctx_isunresolved(ifctx) != 0) 1308 ifctx->xid++; 1309 ifctx->call.xid = txdr_unsigned(ifctx->xid); 1310 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); 1311 1312 vendp = ifctx->call.vend; 1313 *vendp++ = 99; /* RFC1048 cookie */ 1314 *vendp++ = 130; 1315 *vendp++ = 83; 1316 *vendp++ = 99; 1317 *vendp++ = TAG_MAXMSGSIZE; 1318 *vendp++ = 2; 1319 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; 1320 *vendp++ = sizeof(struct bootp_packet) & 255; 1321 1322 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", 1323 ostype, MACHINE, osrelease); 1324 vendor_client_len = strlen(vendor_client); 1325 *vendp++ = TAG_VENDOR_INDENTIFIER; 1326 *vendp++ = vendor_client_len; 1327 memcpy(vendp, vendor_client, vendor_client_len); 1328 vendp += vendor_client_len; 1329 ifctx->dhcpquerytype = DHCP_NOMSG; 1330 switch (ifctx->state) { 1331 case IF_DHCP_UNRESOLVED: 1332 *vendp++ = TAG_DHCP_MSGTYPE; 1333 *vendp++ = 1; 1334 *vendp++ = DHCP_DISCOVER; 1335 ifctx->dhcpquerytype = DHCP_DISCOVER; 1336 ifctx->gotdhcpserver = 0; 1337 break; 1338 case IF_DHCP_OFFERED: 1339 *vendp++ = TAG_DHCP_MSGTYPE; 1340 *vendp++ = 1; 1341 *vendp++ = DHCP_REQUEST; 1342 ifctx->dhcpquerytype = DHCP_REQUEST; 1343 *vendp++ = TAG_DHCP_REQ_ADDR; 1344 *vendp++ = 4; 1345 memcpy(vendp, &ifctx->reply.yiaddr, 4); 1346 vendp += 4; 1347 if (ifctx->gotdhcpserver != 0) { 1348 *vendp++ = TAG_DHCP_SERVERID; 1349 *vendp++ = 4; 1350 memcpy(vendp, &ifctx->dhcpserver, 4); 1351 vendp += 4; 1352 } 1353 *vendp++ = TAG_DHCP_LEASETIME; 1354 *vendp++ = 4; 1355 leasetime = htonl(300); 1356 memcpy(vendp, &leasetime, 4); 1357 vendp += 4; 1358 break; 1359 default: 1360 break; 1361 } 1362 *vendp = TAG_END; 1363 1364 ifctx->call.secs = 0; 1365 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */ 1366 } 1367 1368 static int 1369 bootpc_hascookie(struct bootp_packet *bp) 1370 { 1371 1372 return (bp->vend[0] == 99 && bp->vend[1] == 130 && 1373 bp->vend[2] == 83 && bp->vend[3] == 99); 1374 } 1375 1376 static void 1377 bootpc_tag_helper(struct bootpc_tagcontext *tctx, 1378 unsigned char *start, int len, int tag) 1379 { 1380 unsigned char *j; 1381 unsigned char *ej; 1382 unsigned char code; 1383 1384 if (tctx->badtag != 0 || tctx->badopt != 0) 1385 return; 1386 1387 j = start; 1388 ej = j + len; 1389 1390 while (j < ej) { 1391 code = *j++; 1392 if (code == TAG_PAD) 1393 continue; 1394 if (code == TAG_END) 1395 return; 1396 if (j >= ej || j + *j + 1 > ej) { 1397 tctx->badopt = 1; 1398 return; 1399 } 1400 len = *j++; 1401 if (code == tag) { 1402 if (tctx->taglen + len > TAG_MAXLEN) { 1403 tctx->badtag = 1; 1404 return; 1405 } 1406 tctx->foundopt = 1; 1407 if (len > 0) 1408 memcpy(tctx->buf + tctx->taglen, 1409 j, len); 1410 tctx->taglen += len; 1411 } 1412 if (code == TAG_OVERLOAD) 1413 tctx->overload = *j; 1414 1415 j += len; 1416 } 1417 } 1418 1419 static unsigned char * 1420 bootpc_tag(struct bootpc_tagcontext *tctx, 1421 struct bootp_packet *bp, int len, int tag) 1422 { 1423 tctx->overload = 0; 1424 tctx->badopt = 0; 1425 tctx->badtag = 0; 1426 tctx->foundopt = 0; 1427 tctx->taglen = 0; 1428 1429 if (bootpc_hascookie(bp) == 0) 1430 return NULL; 1431 1432 bootpc_tag_helper(tctx, &bp->vend[4], 1433 (unsigned char *) bp + len - &bp->vend[4], tag); 1434 1435 if ((tctx->overload & OVERLOAD_FILE) != 0) 1436 bootpc_tag_helper(tctx, 1437 (unsigned char *) bp->file, 1438 sizeof(bp->file), 1439 tag); 1440 if ((tctx->overload & OVERLOAD_SNAME) != 0) 1441 bootpc_tag_helper(tctx, 1442 (unsigned char *) bp->sname, 1443 sizeof(bp->sname), 1444 tag); 1445 1446 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0) 1447 return NULL; 1448 tctx->buf[tctx->taglen] = '\0'; 1449 return tctx->buf; 1450 } 1451 1452 static void 1453 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx, 1454 struct bootpc_globalcontext *gctx) 1455 { 1456 char *p; 1457 unsigned int ip; 1458 1459 ifctx->gotgw = 0; 1460 ifctx->gotnetmask = 0; 1461 1462 clear_sinaddr(&ifctx->myaddr); 1463 clear_sinaddr(&ifctx->netmask); 1464 clear_sinaddr(&ifctx->gw); 1465 1466 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1467 1468 ip = ntohl(ifctx->myaddr.sin_addr.s_addr); 1469 1470 printf("%s at ", ifctx->ireq.ifr_name); 1471 print_sin_addr(&ifctx->myaddr); 1472 printf(" server "); 1473 print_in_addr(ifctx->reply.siaddr); 1474 1475 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1476 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1477 printf(" via gateway "); 1478 print_in_addr(ifctx->reply.giaddr); 1479 } 1480 1481 /* This call used for the side effect (overload flag) */ 1482 (void) bootpc_tag(&gctx->tmptag, 1483 &ifctx->reply, ifctx->replylen, TAG_END); 1484 1485 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1486 if (ifctx->reply.sname[0] != '\0') 1487 printf(" server name %s", ifctx->reply.sname); 1488 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1489 if (ifctx->reply.file[0] != '\0') 1490 printf(" boot file %s", ifctx->reply.file); 1491 1492 printf("\n"); 1493 1494 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1495 TAG_SUBNETMASK); 1496 if (p != NULL) { 1497 if (gctx->tag.taglen != 4) 1498 panic("bootpc: subnet mask len is %d", 1499 gctx->tag.taglen); 1500 bcopy(p, &ifctx->netmask.sin_addr, 4); 1501 ifctx->gotnetmask = 1; 1502 printf("subnet mask "); 1503 print_sin_addr(&ifctx->netmask); 1504 printf(" "); 1505 } 1506 1507 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1508 TAG_ROUTERS); 1509 if (p != NULL) { 1510 /* Routers */ 1511 if (gctx->tag.taglen % 4) 1512 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1513 if (gctx->tag.taglen > 0) { 1514 bcopy(p, &ifctx->gw.sin_addr, 4); 1515 printf("router "); 1516 print_sin_addr(&ifctx->gw); 1517 printf(" "); 1518 ifctx->gotgw = 1; 1519 gctx->gotgw = 1; 1520 } 1521 } 1522 1523 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1524 TAG_ROOT); 1525 if (p != NULL) { 1526 if (gctx->setrootfs != NULL) { 1527 printf("rootfs %s (ignored) ", p); 1528 } else if (setfs(&nd->root_saddr, 1529 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1530 if (*p == '/') { 1531 printf("root_server "); 1532 print_sin_addr(&nd->root_saddr); 1533 printf(" "); 1534 } 1535 printf("rootfs %s ", p); 1536 gctx->gotrootpath = 1; 1537 ifctx->gotrootpath = 1; 1538 gctx->setrootfs = ifctx; 1539 1540 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1541 ifctx->replylen, 1542 TAG_ROOTOPTS); 1543 if (p != NULL) { 1544 mountopts(&nd->root_args, p); 1545 printf("rootopts %s ", p); 1546 } 1547 } else 1548 panic("Failed to set rootfs to %s", p); 1549 } 1550 1551 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1552 TAG_HOSTNAME); 1553 if (p != NULL) { 1554 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1555 panic("bootpc: hostname >= %d bytes", 1556 MAXHOSTNAMELEN); 1557 if (gctx->sethostname != NULL) { 1558 printf("hostname %s (ignored) ", p); 1559 } else { 1560 strcpy(nd->my_hostnam, p); 1561 mtx_lock(&prison0.pr_mtx); 1562 strcpy(prison0.pr_hostname, p); 1563 mtx_unlock(&prison0.pr_mtx); 1564 printf("hostname %s ", p); 1565 gctx->sethostname = ifctx; 1566 } 1567 } 1568 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1569 TAG_COOKIE); 1570 if (p != NULL) { /* store in a sysctl variable */ 1571 int i, l = sizeof(bootp_cookie) - 1; 1572 for (i = 0; i < l && p[i] != '\0'; i++) 1573 bootp_cookie[i] = p[i]; 1574 p[i] = '\0'; 1575 } 1576 1577 1578 printf("\n"); 1579 1580 if (ifctx->gotnetmask == 0) { 1581 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1582 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1583 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1584 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1585 else 1586 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1587 } 1588 if (ifctx->gotgw == 0) { 1589 /* Use proxyarp */ 1590 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr; 1591 } 1592 } 1593 1594 void 1595 bootpc_init(void) 1596 { 1597 struct bootpc_ifcontext *ifctx, *nctx; /* Interface BOOTP contexts */ 1598 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1599 struct ifnet *ifp; 1600 int error; 1601 #ifndef BOOTP_WIRED_TO 1602 int ifcnt; 1603 #endif 1604 struct nfsv3_diskless *nd; 1605 struct thread *td; 1606 1607 nd = &nfsv3_diskless; 1608 td = curthread; 1609 1610 /* 1611 * If already filled in, don't touch it here 1612 */ 1613 if (nfs_diskless_valid != 0) 1614 return; 1615 1616 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1617 if (gctx == NULL) 1618 panic("Failed to allocate bootp global context structure"); 1619 1620 gctx->xid = ~0xFFFF; 1621 gctx->starttime = time_second; 1622 1623 /* 1624 * Find a network interface. 1625 */ 1626 CURVNET_SET(TD_TO_VNET(td)); 1627 #ifdef BOOTP_WIRED_TO 1628 printf("bootpc_init: wired to interface '%s'\n", 1629 __XSTRING(BOOTP_WIRED_TO)); 1630 allocifctx(gctx); 1631 #else 1632 /* 1633 * Preallocate interface context storage, if another interface 1634 * attaches and wins the race, it won't be eligible for bootp. 1635 */ 1636 IFNET_RLOCK(); 1637 for (ifp = TAILQ_FIRST(&V_ifnet), ifcnt = 0; 1638 ifp != NULL; 1639 ifp = TAILQ_NEXT(ifp, if_link)) { 1640 if ((ifp->if_flags & 1641 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1642 IFF_BROADCAST) 1643 continue; 1644 ifcnt++; 1645 } 1646 IFNET_RUNLOCK(); 1647 if (ifcnt == 0) 1648 panic("bootpc_init: no eligible interfaces"); 1649 for (; ifcnt > 0; ifcnt--) 1650 allocifctx(gctx); 1651 #endif 1652 1653 IFNET_RLOCK(); 1654 for (ifp = TAILQ_FIRST(&V_ifnet), ifctx = gctx->interfaces; 1655 ifp != NULL && ifctx != NULL; 1656 ifp = TAILQ_NEXT(ifp, if_link)) { 1657 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1658 sizeof(ifctx->ireq.ifr_name)); 1659 #ifdef BOOTP_WIRED_TO 1660 if (strcmp(ifctx->ireq.ifr_name, 1661 __XSTRING(BOOTP_WIRED_TO)) != 0) 1662 continue; 1663 #else 1664 if ((ifp->if_flags & 1665 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1666 IFF_BROADCAST) 1667 continue; 1668 #endif 1669 ifctx->ifp = ifp; 1670 ifctx = ifctx->next; 1671 } 1672 IFNET_RUNLOCK(); 1673 CURVNET_RESTORE(); 1674 1675 if (gctx->interfaces == NULL || gctx->interfaces->ifp == NULL) { 1676 #ifdef BOOTP_WIRED_TO 1677 panic("bootpc_init: Could not find interface specified " 1678 "by BOOTP_WIRED_TO: " 1679 __XSTRING(BOOTP_WIRED_TO)); 1680 #else 1681 panic("bootpc_init: no suitable interface"); 1682 #endif 1683 } 1684 1685 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1686 bootpc_fakeup_interface(ifctx, gctx, td); 1687 1688 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1689 bootpc_compose_query(ifctx, gctx, td); 1690 1691 error = bootpc_call(gctx, td); 1692 1693 if (error != 0) { 1694 #ifdef BOOTP_NFSROOT 1695 panic("BOOTP call failed"); 1696 #else 1697 printf("BOOTP call failed\n"); 1698 #endif 1699 } 1700 1701 rootdevnames[0] = "nfs:"; 1702 #ifdef NFSCLIENT 1703 rootdevnames[1] = "oldnfs:"; 1704 #endif 1705 mountopts(&nd->root_args, NULL); 1706 1707 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1708 if (bootpc_ifctx_isresolved(ifctx) != 0) 1709 bootpc_decode_reply(nd, ifctx, gctx); 1710 1711 #ifdef BOOTP_NFSROOT 1712 if (gctx->gotrootpath == 0) 1713 panic("bootpc: No root path offered"); 1714 #endif 1715 1716 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) { 1717 bootpc_adjust_interface(ifctx, gctx, td); 1718 1719 soclose(ifctx->so); 1720 } 1721 1722 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) 1723 if (ifctx->gotrootpath != 0) 1724 break; 1725 if (ifctx == NULL) { 1726 for (ifctx = gctx->interfaces; 1727 ifctx != NULL; 1728 ifctx = ifctx->next) 1729 if (bootpc_ifctx_isresolved(ifctx) != 0) 1730 break; 1731 } 1732 if (ifctx == NULL) 1733 goto out; 1734 1735 if (gctx->gotrootpath != 0) { 1736 1737 setenv("boot.netif.name", ifctx->ifp->if_xname); 1738 1739 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1740 nd->root_fh, &nd->root_fhsize, 1741 &nd->root_args, td); 1742 if (error != 0) 1743 panic("nfs_boot: mountd root, error=%d", error); 1744 1745 nfs_diskless_valid = 3; 1746 } 1747 1748 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1749 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1750 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1751 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1752 ifctx->myaddr.sin_addr.s_addr | 1753 ~ ifctx->netmask.sin_addr.s_addr; 1754 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1755 1756 out: 1757 for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) { 1758 nctx = ifctx->next; 1759 free(ifctx, M_TEMP); 1760 } 1761 free(gctx, M_TEMP); 1762 } 1763 1764 /* 1765 * RPC: mountd/mount 1766 * Given a server pathname, get an NFS file handle. 1767 * Also, sets sin->sin_port to the NFS service port. 1768 */ 1769 static int 1770 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1771 struct nfs_args *args, struct thread *td) 1772 { 1773 struct mbuf *m; 1774 int error; 1775 int authunixok; 1776 int authcount; 1777 int authver; 1778 1779 #define RPCPROG_MNT 100005 1780 #define RPCMNT_VER1 1 1781 #define RPCMNT_VER3 3 1782 #define RPCMNT_MOUNT 1 1783 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1784 #define AUTH_UNIX AUTH_SYS 1785 1786 /* XXX honor v2/v3 flags in args->flags? */ 1787 #ifdef BOOTP_NFSV3 1788 /* First try NFS v3 */ 1789 /* Get port number for MOUNTD. */ 1790 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1791 &mdsin->sin_port, td); 1792 if (error == 0) { 1793 m = xdr_string_encode(path, strlen(path)); 1794 1795 /* Do RPC to mountd. */ 1796 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1797 RPCMNT_MOUNT, &m, NULL, td); 1798 } 1799 if (error == 0) { 1800 args->flags |= NFSMNT_NFSV3; 1801 } else { 1802 #endif 1803 /* Fallback to NFS v2 */ 1804 1805 /* Get port number for MOUNTD. */ 1806 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1807 &mdsin->sin_port, td); 1808 if (error != 0) 1809 return error; 1810 1811 m = xdr_string_encode(path, strlen(path)); 1812 1813 /* Do RPC to mountd. */ 1814 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1815 RPCMNT_MOUNT, &m, NULL, td); 1816 if (error != 0) 1817 return error; /* message already freed */ 1818 1819 #ifdef BOOTP_NFSV3 1820 } 1821 #endif 1822 1823 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1824 goto bad; 1825 1826 if ((args->flags & NFSMNT_NFSV3) != 0) { 1827 if (xdr_int_decode(&m, fhsizep) != 0 || 1828 *fhsizep > NFSX_V3FHMAX || 1829 *fhsizep <= 0) 1830 goto bad; 1831 } else 1832 *fhsizep = NFSX_V2FH; 1833 1834 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1835 goto bad; 1836 1837 if (args->flags & NFSMNT_NFSV3) { 1838 if (xdr_int_decode(&m, &authcount) != 0) 1839 goto bad; 1840 authunixok = 0; 1841 if (authcount < 0 || authcount > 100) 1842 goto bad; 1843 while (authcount > 0) { 1844 if (xdr_int_decode(&m, &authver) != 0) 1845 goto bad; 1846 if (authver == AUTH_UNIX) 1847 authunixok = 1; 1848 authcount--; 1849 } 1850 if (authunixok == 0) 1851 goto bad; 1852 } 1853 1854 /* Set port number for NFS use. */ 1855 error = krpc_portmap(mdsin, NFS_PROG, 1856 (args->flags & 1857 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1858 &mdsin->sin_port, td); 1859 1860 goto out; 1861 1862 bad: 1863 error = EBADRPC; 1864 1865 out: 1866 m_freem(m); 1867 return error; 1868 } 1869 1870 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
Cache object: 5905c2a2da36351f9d1632270785ebdc
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