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: releng/10.0/sys/nfs/bootp_subr.c 253847 2013-07-31 19:14:00Z ian $"); 45 46 #include "opt_bootp.h" 47 #include "opt_nfs.h" 48 #include "opt_rootdevname.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/jail.h> 53 #include <sys/kernel.h> 54 #include <sys/sockio.h> 55 #include <sys/malloc.h> 56 #include <sys/mount.h> 57 #include <sys/mbuf.h> 58 #include <sys/proc.h> 59 #include <sys/reboot.h> 60 #include <sys/socket.h> 61 #include <sys/socketvar.h> 62 #include <sys/sysctl.h> 63 #include <sys/uio.h> 64 65 #include <net/if.h> 66 #include <net/route.h> 67 68 #include <netinet/in.h> 69 #include <netinet/in_var.h> 70 #include <net/if_types.h> 71 #include <net/if_dl.h> 72 #include <net/vnet.h> 73 74 #include <nfs/nfsproto.h> 75 #include <nfsclient/nfs.h> 76 #include <nfs/nfsdiskless.h> 77 #include <nfs/krpc.h> 78 #include <nfs/xdr_subs.h> 79 80 81 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */ 82 83 #ifndef BOOTP_SETTLE_DELAY 84 #define BOOTP_SETTLE_DELAY 3 85 #endif 86 87 /* 88 * Wait 10 seconds for interface appearance 89 * USB ethernet adapters might require some time to pop up 90 */ 91 #ifndef BOOTP_IFACE_WAIT_TIMEOUT 92 #define BOOTP_IFACE_WAIT_TIMEOUT 10 93 #endif 94 95 /* 96 * What is the longest we will wait before re-sending a request? 97 * Note this is also the frequency of "RPC timeout" messages. 98 * The re-send loop count sup linearly to this maximum, so the 99 * first complaint will happen after (1+2+3+4+5)=15 seconds. 100 */ 101 #define MAX_RESEND_DELAY 5 /* seconds */ 102 103 /* Definitions from RFC951 */ 104 struct bootp_packet { 105 u_int8_t op; 106 u_int8_t htype; 107 u_int8_t hlen; 108 u_int8_t hops; 109 u_int32_t xid; 110 u_int16_t secs; 111 u_int16_t flags; 112 struct in_addr ciaddr; 113 struct in_addr yiaddr; 114 struct in_addr siaddr; 115 struct in_addr giaddr; 116 unsigned char chaddr[16]; 117 char sname[64]; 118 char file[128]; 119 unsigned char vend[1222]; 120 }; 121 122 struct bootpc_ifcontext { 123 STAILQ_ENTRY(bootpc_ifcontext) next; 124 struct bootp_packet call; 125 struct bootp_packet reply; 126 int replylen; 127 int overload; 128 union { 129 struct ifreq _ifreq; 130 struct in_aliasreq _in_alias_req; 131 } _req; 132 #define ireq _req._ifreq 133 #define iareq _req._in_alias_req 134 struct ifnet *ifp; 135 struct sockaddr_dl *sdl; 136 struct sockaddr_in myaddr; 137 struct sockaddr_in netmask; 138 struct sockaddr_in gw; 139 int gotgw; 140 int gotnetmask; 141 int gotrootpath; 142 int outstanding; 143 int sentmsg; 144 u_int32_t xid; 145 enum { 146 IF_BOOTP_UNRESOLVED, 147 IF_BOOTP_RESOLVED, 148 IF_BOOTP_FAILED, 149 IF_DHCP_UNRESOLVED, 150 IF_DHCP_OFFERED, 151 IF_DHCP_RESOLVED, 152 IF_DHCP_FAILED, 153 } state; 154 int dhcpquerytype; /* dhcp type sent */ 155 struct in_addr dhcpserver; 156 int gotdhcpserver; 157 }; 158 159 #define TAG_MAXLEN 1024 160 struct bootpc_tagcontext { 161 char buf[TAG_MAXLEN + 1]; 162 int overload; 163 int badopt; 164 int badtag; 165 int foundopt; 166 int taglen; 167 }; 168 169 struct bootpc_globalcontext { 170 STAILQ_HEAD(, bootpc_ifcontext) interfaces; 171 u_int32_t xid; 172 int any_root_overrides; 173 int gotrootpath; 174 int gotgw; 175 int ifnum; 176 int secs; 177 int starttime; 178 struct bootp_packet reply; 179 int replylen; 180 struct bootpc_ifcontext *setrootfs; 181 struct bootpc_ifcontext *sethostname; 182 struct bootpc_tagcontext tmptag; 183 struct bootpc_tagcontext tag; 184 }; 185 186 #define IPPORT_BOOTPC 68 187 #define IPPORT_BOOTPS 67 188 189 #define BOOTP_REQUEST 1 190 #define BOOTP_REPLY 2 191 192 /* Common tags */ 193 #define TAG_PAD 0 /* Pad option, implicit length 1 */ 194 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */ 195 #define TAG_ROUTERS 3 /* Routers (in order of preference) */ 196 #define TAG_HOSTNAME 12 /* Client host name */ 197 #define TAG_ROOT 17 /* Root path */ 198 199 /* DHCP specific tags */ 200 #define TAG_OVERLOAD 52 /* Option Overload */ 201 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */ 202 203 #define TAG_END 255 /* End Option (i.e. no more options) */ 204 205 /* Overload values */ 206 #define OVERLOAD_FILE 1 207 #define OVERLOAD_SNAME 2 208 209 /* Site specific tags: */ 210 #define TAG_ROOTOPTS 130 211 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */ 212 213 #define TAG_DHCP_MSGTYPE 53 214 #define TAG_DHCP_REQ_ADDR 50 215 #define TAG_DHCP_SERVERID 54 216 #define TAG_DHCP_LEASETIME 51 217 218 #define TAG_VENDOR_INDENTIFIER 60 219 220 #define DHCP_NOMSG 0 221 #define DHCP_DISCOVER 1 222 #define DHCP_OFFER 2 223 #define DHCP_REQUEST 3 224 #define DHCP_ACK 5 225 226 /* NFS read/write block size */ 227 #ifndef BOOTP_BLOCKSIZE 228 #define BOOTP_BLOCKSIZE 8192 229 #endif 230 231 static char bootp_cookie[128]; 232 static struct socket *bootp_so; 233 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, 234 bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); 235 236 /* mountd RPC */ 237 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, 238 int *fhsizep, struct nfs_args *args, struct thread *td); 239 static int setfs(struct sockaddr_in *addr, char *path, char *p, 240 const struct in_addr *siaddr); 241 static int getdec(char **ptr); 242 static int getip(char **ptr, struct in_addr *ip); 243 static void mountopts(struct nfs_args *args, char *p); 244 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 245 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 246 static void print_in_addr(struct in_addr addr); 247 static void print_sin_addr(struct sockaddr_in *addr); 248 static void clear_sinaddr(struct sockaddr_in *sin); 249 static void allocifctx(struct bootpc_globalcontext *gctx); 250 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx, 251 struct thread *td); 252 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx, 253 struct bootp_packet *bp, int len, int tag); 254 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx, 255 unsigned char *start, int len, int tag); 256 257 #ifdef BOOTP_DEBUG 258 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma); 259 void bootpboot_p_rtentry(struct rtentry *rt); 260 void bootpboot_p_tree(struct radix_node *rn); 261 void bootpboot_p_rtlist(void); 262 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa); 263 void bootpboot_p_iflist(void); 264 #endif 265 266 static int bootpc_call(struct bootpc_globalcontext *gctx, 267 struct thread *td); 268 269 static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 270 struct thread *td); 271 272 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 273 struct bootpc_globalcontext *gctx, struct thread *td); 274 275 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 276 struct bootpc_ifcontext *ifctx, 277 struct bootpc_globalcontext *gctx); 278 279 static int bootpc_received(struct bootpc_globalcontext *gctx, 280 struct bootpc_ifcontext *ifctx); 281 282 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 283 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 284 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 285 286 /* 287 * In order to have multiple active interfaces with address 0.0.0.0 288 * and be able to send data to a selected interface, we first set 289 * mask to /8 on all interfaces, and temporarily set it to /0 when 290 * doing sosend(). 291 */ 292 293 #ifdef BOOTP_DEBUG 294 void 295 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma) 296 { 297 298 if (sa == NULL) { 299 printf("(sockaddr *) <null>"); 300 return; 301 } 302 switch (sa->sa_family) { 303 case AF_INET: 304 { 305 struct sockaddr_in *sin; 306 307 sin = (struct sockaddr_in *) sa; 308 printf("inet "); 309 print_sin_addr(sin); 310 if (ma != NULL) { 311 sin = (struct sockaddr_in *) ma; 312 printf(" mask "); 313 print_sin_addr(sin); 314 } 315 } 316 break; 317 case AF_LINK: 318 { 319 struct sockaddr_dl *sli; 320 int i; 321 322 sli = (struct sockaddr_dl *) sa; 323 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data); 324 for (i = 0; i < sli->sdl_alen; i++) { 325 if (i > 0) 326 printf(":"); 327 printf("%x", ((unsigned char *) LLADDR(sli))[i]); 328 } 329 } 330 break; 331 default: 332 printf("af%d", sa->sa_family); 333 } 334 } 335 336 void 337 bootpboot_p_rtentry(struct rtentry *rt) 338 { 339 340 bootpboot_p_sa(rt_key(rt), rt_mask(rt)); 341 printf(" "); 342 bootpboot_p_sa(rt->rt_gateway, NULL); 343 printf(" "); 344 printf("flags %x", (unsigned short) rt->rt_flags); 345 printf(" %d", (int) rt->rt_rmx.rmx_expire); 346 printf(" %s\n", rt->rt_ifp->if_xname); 347 } 348 349 void 350 bootpboot_p_tree(struct radix_node *rn) 351 { 352 353 while (rn != NULL) { 354 if (rn->rn_bit < 0) { 355 if ((rn->rn_flags & RNF_ROOT) != 0) { 356 } else { 357 bootpboot_p_rtentry((struct rtentry *) rn); 358 } 359 rn = rn->rn_dupedkey; 360 } else { 361 bootpboot_p_tree(rn->rn_left); 362 bootpboot_p_tree(rn->rn_right); 363 return; 364 } 365 } 366 } 367 368 void 369 bootpboot_p_rtlist(void) 370 { 371 struct radix_node_head *rnh; 372 373 printf("Routing table:\n"); 374 rnh = rt_tables_get_rnh(0, AF_INET); 375 if (rnh == NULL) 376 return; 377 RADIX_NODE_HEAD_RLOCK(rnh); /* could sleep XXX */ 378 bootpboot_p_tree(rnh->rnh_treetop); 379 RADIX_NODE_HEAD_RUNLOCK(rnh); 380 } 381 382 void 383 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 384 { 385 386 printf("%s flags %x, addr ", 387 ifp->if_xname, ifp->if_flags); 388 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 389 printf(", broadcast "); 390 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 391 printf(", netmask "); 392 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 393 printf("\n"); 394 } 395 396 void 397 bootpboot_p_iflist(void) 398 { 399 struct ifnet *ifp; 400 struct ifaddr *ifa; 401 402 printf("Interface list:\n"); 403 IFNET_RLOCK(); 404 for (ifp = TAILQ_FIRST(&V_ifnet); 405 ifp != NULL; 406 ifp = TAILQ_NEXT(ifp, if_link)) { 407 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); 408 ifa != NULL; 409 ifa = TAILQ_NEXT(ifa, ifa_link)) 410 if (ifa->ifa_addr->sa_family == AF_INET) 411 bootpboot_p_if(ifp, ifa); 412 } 413 IFNET_RUNLOCK(); 414 } 415 #endif /* defined(BOOTP_DEBUG) */ 416 417 static void 418 clear_sinaddr(struct sockaddr_in *sin) 419 { 420 421 bzero(sin, sizeof(*sin)); 422 sin->sin_len = sizeof(*sin); 423 sin->sin_family = AF_INET; 424 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 425 sin->sin_port = 0; 426 } 427 428 static void 429 allocifctx(struct bootpc_globalcontext *gctx) 430 { 431 struct bootpc_ifcontext *ifctx; 432 433 ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO); 434 ifctx->xid = gctx->xid; 435 #ifdef BOOTP_NO_DHCP 436 ifctx->state = IF_BOOTP_UNRESOLVED; 437 #else 438 ifctx->state = IF_DHCP_UNRESOLVED; 439 #endif 440 gctx->xid += 0x100; 441 STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next); 442 } 443 444 static __inline int 445 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 446 { 447 448 if (ifctx->state == IF_BOOTP_RESOLVED || 449 ifctx->state == IF_DHCP_RESOLVED) 450 return 1; 451 return 0; 452 } 453 454 static __inline int 455 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 456 { 457 458 if (ifctx->state == IF_BOOTP_UNRESOLVED || 459 ifctx->state == IF_DHCP_UNRESOLVED) 460 return 1; 461 return 0; 462 } 463 464 static __inline int 465 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 466 { 467 468 if (ifctx->state == IF_BOOTP_FAILED || 469 ifctx->state == IF_DHCP_FAILED) 470 return 1; 471 return 0; 472 } 473 474 static int 475 bootpc_received(struct bootpc_globalcontext *gctx, 476 struct bootpc_ifcontext *ifctx) 477 { 478 unsigned char dhcpreplytype; 479 char *p; 480 481 /* 482 * Need timeout for fallback to less 483 * desirable alternative. 484 */ 485 486 /* This call used for the side effect (badopt flag) */ 487 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 488 gctx->replylen, 489 TAG_END); 490 491 /* If packet is invalid, ignore it */ 492 if (gctx->tmptag.badopt != 0) 493 return 0; 494 495 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 496 gctx->replylen, TAG_DHCP_MSGTYPE); 497 if (p != NULL) 498 dhcpreplytype = *p; 499 else 500 dhcpreplytype = DHCP_NOMSG; 501 502 switch (ifctx->dhcpquerytype) { 503 case DHCP_DISCOVER: 504 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 505 #ifndef BOOTP_FORCE_DHCP 506 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 507 #endif 508 ) 509 return 0; 510 break; 511 case DHCP_REQUEST: 512 if (dhcpreplytype != DHCP_ACK) 513 return 0; 514 case DHCP_NOMSG: 515 break; 516 } 517 518 /* Ignore packet unless it gives us a root tag we didn't have */ 519 520 if ((ifctx->state == IF_BOOTP_RESOLVED || 521 (ifctx->dhcpquerytype == DHCP_DISCOVER && 522 (ifctx->state == IF_DHCP_OFFERED || 523 ifctx->state == IF_DHCP_RESOLVED))) && 524 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 525 ifctx->replylen, 526 TAG_ROOT) != NULL || 527 bootpc_tag(&gctx->tmptag, &gctx->reply, 528 gctx->replylen, 529 TAG_ROOT) == NULL)) 530 return 0; 531 532 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 533 ifctx->replylen = gctx->replylen; 534 535 /* XXX: Only reset if 'perfect' response */ 536 if (ifctx->state == IF_BOOTP_UNRESOLVED) 537 ifctx->state = IF_BOOTP_RESOLVED; 538 else if (ifctx->state == IF_DHCP_UNRESOLVED && 539 ifctx->dhcpquerytype == DHCP_DISCOVER) { 540 if (dhcpreplytype == DHCP_OFFER) 541 ifctx->state = IF_DHCP_OFFERED; 542 else 543 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 544 } else if (ifctx->state == IF_DHCP_OFFERED && 545 ifctx->dhcpquerytype == DHCP_REQUEST) 546 ifctx->state = IF_DHCP_RESOLVED; 547 548 549 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 550 ifctx->state != IF_BOOTP_RESOLVED) { 551 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 552 ifctx->replylen, TAG_DHCP_SERVERID); 553 if (p != NULL && gctx->tmptag.taglen == 4) { 554 memcpy(&ifctx->dhcpserver, p, 4); 555 ifctx->gotdhcpserver = 1; 556 } else 557 ifctx->gotdhcpserver = 0; 558 return 1; 559 } 560 561 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 562 ifctx->replylen, 563 TAG_ROOT) != NULL); 564 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 565 ifctx->replylen, 566 TAG_ROUTERS) != NULL); 567 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 568 ifctx->replylen, 569 TAG_SUBNETMASK) != NULL); 570 return 1; 571 } 572 573 static int 574 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 575 { 576 struct sockaddr_in *sin, dst; 577 struct uio auio; 578 struct sockopt sopt; 579 struct iovec aio; 580 int error, on, rcvflg, timo, len; 581 time_t atimo; 582 time_t rtimo; 583 struct timeval tv; 584 struct bootpc_ifcontext *ifctx; 585 int outstanding; 586 int gotrootpath; 587 int retry; 588 const char *s; 589 590 tv.tv_sec = 1; 591 tv.tv_usec = 0; 592 bzero(&sopt, sizeof(sopt)); 593 sopt.sopt_dir = SOPT_SET; 594 sopt.sopt_level = SOL_SOCKET; 595 sopt.sopt_name = SO_RCVTIMEO; 596 sopt.sopt_val = &tv; 597 sopt.sopt_valsize = sizeof tv; 598 599 error = sosetopt(bootp_so, &sopt); 600 if (error != 0) 601 goto out; 602 603 /* 604 * Enable broadcast. 605 */ 606 on = 1; 607 sopt.sopt_name = SO_BROADCAST; 608 sopt.sopt_val = &on; 609 sopt.sopt_valsize = sizeof on; 610 611 error = sosetopt(bootp_so, &sopt); 612 if (error != 0) 613 goto out; 614 615 /* 616 * Disable routing. 617 */ 618 619 on = 1; 620 sopt.sopt_name = SO_DONTROUTE; 621 sopt.sopt_val = &on; 622 sopt.sopt_valsize = sizeof on; 623 624 error = sosetopt(bootp_so, &sopt); 625 if (error != 0) 626 goto out; 627 628 /* 629 * Bind the local endpoint to a bootp client port. 630 */ 631 sin = &dst; 632 clear_sinaddr(sin); 633 sin->sin_port = htons(IPPORT_BOOTPC); 634 error = sobind(bootp_so, (struct sockaddr *)sin, td); 635 if (error != 0) { 636 printf("bind failed\n"); 637 goto out; 638 } 639 640 /* 641 * Setup socket address for the server. 642 */ 643 sin = &dst; 644 clear_sinaddr(sin); 645 sin->sin_addr.s_addr = INADDR_BROADCAST; 646 sin->sin_port = htons(IPPORT_BOOTPS); 647 648 /* 649 * Send it, repeatedly, until a reply is received, 650 * but delay each re-send by an increasing amount. 651 * If the delay hits the maximum, start complaining. 652 */ 653 timo = 0; 654 rtimo = 0; 655 for (;;) { 656 657 outstanding = 0; 658 gotrootpath = 0; 659 660 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 661 if (bootpc_ifctx_isresolved(ifctx) != 0 && 662 bootpc_tag(&gctx->tmptag, &ifctx->reply, 663 ifctx->replylen, 664 TAG_ROOT) != NULL) 665 gotrootpath = 1; 666 } 667 668 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 669 struct in_aliasreq *ifra = &ifctx->iareq; 670 sin = (struct sockaddr_in *)&ifra->ifra_mask; 671 672 ifctx->outstanding = 0; 673 if (bootpc_ifctx_isresolved(ifctx) != 0 && 674 gotrootpath != 0) { 675 continue; 676 } 677 if (bootpc_ifctx_isfailed(ifctx) != 0) 678 continue; 679 680 outstanding++; 681 ifctx->outstanding = 1; 682 683 /* Proceed to next step in DHCP negotiation */ 684 if ((ifctx->state == IF_DHCP_OFFERED && 685 ifctx->dhcpquerytype != DHCP_REQUEST) || 686 (ifctx->state == IF_DHCP_UNRESOLVED && 687 ifctx->dhcpquerytype != DHCP_DISCOVER) || 688 (ifctx->state == IF_BOOTP_UNRESOLVED && 689 ifctx->dhcpquerytype != DHCP_NOMSG)) { 690 ifctx->sentmsg = 0; 691 bootpc_compose_query(ifctx, td); 692 } 693 694 /* Send BOOTP request (or re-send). */ 695 696 if (ifctx->sentmsg == 0) { 697 switch(ifctx->dhcpquerytype) { 698 case DHCP_DISCOVER: 699 s = "DHCP Discover"; 700 break; 701 case DHCP_REQUEST: 702 s = "DHCP Request"; 703 break; 704 case DHCP_NOMSG: 705 default: 706 s = "BOOTP Query"; 707 break; 708 } 709 printf("Sending %s packet from " 710 "interface %s (%*D)\n", 711 s, 712 ifctx->ireq.ifr_name, 713 ifctx->sdl->sdl_alen, 714 (unsigned char *) LLADDR(ifctx->sdl), 715 ":"); 716 ifctx->sentmsg = 1; 717 } 718 719 aio.iov_base = (caddr_t) &ifctx->call; 720 aio.iov_len = sizeof(ifctx->call); 721 722 auio.uio_iov = &aio; 723 auio.uio_iovcnt = 1; 724 auio.uio_segflg = UIO_SYSSPACE; 725 auio.uio_rw = UIO_WRITE; 726 auio.uio_offset = 0; 727 auio.uio_resid = sizeof(ifctx->call); 728 auio.uio_td = td; 729 730 /* Set netmask to 0.0.0.0 */ 731 clear_sinaddr(sin); 732 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 733 td); 734 if (error != 0) 735 panic("%s: SIOCAIFADDR, error=%d", __func__, 736 error); 737 738 error = sosend(bootp_so, (struct sockaddr *) &dst, 739 &auio, NULL, NULL, 0, td); 740 if (error != 0) 741 printf("%s: sosend: %d state %08x\n", __func__, 742 error, (int )bootp_so->so_state); 743 744 /* Set netmask to 255.0.0.0 */ 745 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET); 746 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 747 td); 748 if (error != 0) 749 panic("%s: SIOCAIFADDR, error=%d", __func__, 750 error); 751 } 752 753 if (outstanding == 0 && 754 (rtimo == 0 || time_second >= rtimo)) { 755 error = 0; 756 goto out; 757 } 758 759 /* Determine new timeout. */ 760 if (timo < MAX_RESEND_DELAY) 761 timo++; 762 else { 763 printf("DHCP/BOOTP timeout for server "); 764 print_sin_addr(&dst); 765 printf("\n"); 766 } 767 768 /* 769 * Wait for up to timo seconds for a reply. 770 * The socket receive timeout was set to 1 second. 771 */ 772 atimo = timo + time_second; 773 while (time_second < atimo) { 774 aio.iov_base = (caddr_t) &gctx->reply; 775 aio.iov_len = sizeof(gctx->reply); 776 777 auio.uio_iov = &aio; 778 auio.uio_iovcnt = 1; 779 auio.uio_segflg = UIO_SYSSPACE; 780 auio.uio_rw = UIO_READ; 781 auio.uio_offset = 0; 782 auio.uio_resid = sizeof(gctx->reply); 783 auio.uio_td = td; 784 785 rcvflg = 0; 786 error = soreceive(bootp_so, NULL, &auio, 787 NULL, NULL, &rcvflg); 788 gctx->secs = time_second - gctx->starttime; 789 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 790 if (bootpc_ifctx_isresolved(ifctx) != 0 || 791 bootpc_ifctx_isfailed(ifctx) != 0) 792 continue; 793 794 ifctx->call.secs = htons(gctx->secs); 795 } 796 if (error == EWOULDBLOCK) 797 continue; 798 if (error != 0) 799 goto out; 800 len = sizeof(gctx->reply) - auio.uio_resid; 801 802 /* Do we have the required number of bytes ? */ 803 if (len < BOOTP_MIN_LEN) 804 continue; 805 gctx->replylen = len; 806 807 /* Is it a reply? */ 808 if (gctx->reply.op != BOOTP_REPLY) 809 continue; 810 811 /* Is this an answer to our query */ 812 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 813 if (gctx->reply.xid != ifctx->call.xid) 814 continue; 815 816 /* Same HW address size ? */ 817 if (gctx->reply.hlen != ifctx->call.hlen) 818 continue; 819 820 /* Correct HW address ? */ 821 if (bcmp(gctx->reply.chaddr, 822 ifctx->call.chaddr, 823 ifctx->call.hlen) != 0) 824 continue; 825 826 break; 827 } 828 829 if (ifctx != NULL) { 830 s = bootpc_tag(&gctx->tmptag, 831 &gctx->reply, 832 gctx->replylen, 833 TAG_DHCP_MSGTYPE); 834 if (s != NULL) { 835 switch (*s) { 836 case DHCP_OFFER: 837 s = "DHCP Offer"; 838 break; 839 case DHCP_ACK: 840 s = "DHCP Ack"; 841 break; 842 default: 843 s = "DHCP (unexpected)"; 844 break; 845 } 846 } else 847 s = "BOOTP Reply"; 848 849 printf("Received %s packet" 850 " on %s from ", 851 s, 852 ifctx->ireq.ifr_name); 853 print_in_addr(gctx->reply.siaddr); 854 if (gctx->reply.giaddr.s_addr != 855 htonl(INADDR_ANY)) { 856 printf(" via "); 857 print_in_addr(gctx->reply.giaddr); 858 } 859 if (bootpc_received(gctx, ifctx) != 0) { 860 printf(" (accepted)"); 861 if (ifctx->outstanding) { 862 ifctx->outstanding = 0; 863 outstanding--; 864 } 865 /* Network settle delay */ 866 if (outstanding == 0) 867 atimo = time_second + 868 BOOTP_SETTLE_DELAY; 869 } else 870 printf(" (ignored)"); 871 if (ifctx->gotrootpath || 872 gctx->any_root_overrides) { 873 gotrootpath = 1; 874 rtimo = time_second + 875 BOOTP_SETTLE_DELAY; 876 if (ifctx->gotrootpath) 877 printf(" (got root path)"); 878 } 879 printf("\n"); 880 } 881 } /* while secs */ 882 #ifdef BOOTP_TIMEOUT 883 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0) 884 break; 885 #endif 886 /* Force a retry if halfway in DHCP negotiation */ 887 retry = 0; 888 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 889 if (ifctx->state == IF_DHCP_OFFERED) { 890 if (ifctx->dhcpquerytype == DHCP_DISCOVER) 891 retry = 1; 892 else 893 ifctx->state = IF_DHCP_UNRESOLVED; 894 } 895 896 if (retry != 0) 897 continue; 898 899 if (gotrootpath != 0) { 900 gctx->gotrootpath = gotrootpath; 901 if (rtimo != 0 && time_second >= rtimo) 902 break; 903 } 904 } /* forever send/receive */ 905 906 /* 907 * XXX: These are errors of varying seriousness being silently 908 * ignored 909 */ 910 911 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 912 if (bootpc_ifctx_isresolved(ifctx) == 0) { 913 printf("%s timeout for interface %s\n", 914 ifctx->dhcpquerytype != DHCP_NOMSG ? 915 "DHCP" : "BOOTP", 916 ifctx->ireq.ifr_name); 917 } 918 919 if (gctx->gotrootpath != 0) { 920 #if 0 921 printf("Got a root path, ignoring remaining timeout\n"); 922 #endif 923 error = 0; 924 goto out; 925 } 926 #ifndef BOOTP_NFSROOT 927 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 928 if (bootpc_ifctx_isresolved(ifctx) != 0) { 929 error = 0; 930 goto out; 931 } 932 #endif 933 error = ETIMEDOUT; 934 935 out: 936 return (error); 937 } 938 939 static void 940 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 941 { 942 struct ifreq *ifr; 943 struct in_aliasreq *ifra; 944 struct sockaddr_in *sin; 945 int error; 946 947 ifr = &ifctx->ireq; 948 ifra = &ifctx->iareq; 949 950 /* 951 * Bring up the interface. 952 * 953 * Get the old interface flags and or IFF_UP into them; if 954 * IFF_UP set blindly, interface selection can be clobbered. 955 */ 956 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 957 if (error != 0) 958 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 959 ifr->ifr_flags |= IFF_UP; 960 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 961 if (error != 0) 962 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 963 964 /* 965 * Do enough of ifconfig(8) so that the chosen interface 966 * can talk to the servers. Set address to 0.0.0.0/8 and 967 * broadcast address to local broadcast. 968 */ 969 sin = (struct sockaddr_in *)&ifra->ifra_addr; 970 clear_sinaddr(sin); 971 sin = (struct sockaddr_in *)&ifra->ifra_mask; 972 clear_sinaddr(sin); 973 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET); 974 sin = (struct sockaddr_in *)&ifra->ifra_broadaddr; 975 clear_sinaddr(sin); 976 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST); 977 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 978 if (error != 0) 979 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 980 } 981 982 static void 983 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 984 { 985 struct ifreq *ifr; 986 struct sockaddr_in *sin; 987 int error; 988 989 ifr = &ifctx->ireq; 990 991 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); 992 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 993 if (error != 0) 994 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 995 ifr->ifr_flags &= ~IFF_UP; 996 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 997 if (error != 0) 998 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 999 1000 sin = (struct sockaddr_in *) &ifr->ifr_addr; 1001 clear_sinaddr(sin); 1002 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 1003 if (error != 0) 1004 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 1005 } 1006 1007 static int 1008 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 1009 struct bootpc_globalcontext *gctx, struct thread *td) 1010 { 1011 int error; 1012 struct sockaddr_in defdst; 1013 struct sockaddr_in defmask; 1014 struct sockaddr_in *sin; 1015 struct ifreq *ifr; 1016 struct in_aliasreq *ifra; 1017 struct sockaddr_in *myaddr; 1018 struct sockaddr_in *netmask; 1019 struct sockaddr_in *gw; 1020 1021 ifr = &ifctx->ireq; 1022 ifra = &ifctx->iareq; 1023 myaddr = &ifctx->myaddr; 1024 netmask = &ifctx->netmask; 1025 gw = &ifctx->gw; 1026 1027 if (bootpc_ifctx_isresolved(ifctx) == 0) { 1028 /* Shutdown interfaces where BOOTP failed */ 1029 bootpc_shutdown_interface(ifctx, td); 1030 return (0); 1031 } 1032 1033 printf("Adjusted interface %s\n", ifctx->ireq.ifr_name); 1034 /* 1035 * Do enough of ifconfig(8) so that the chosen interface 1036 * can talk to the servers. (just set the address) 1037 */ 1038 sin = (struct sockaddr_in *) &ifr->ifr_addr; 1039 clear_sinaddr(sin); 1040 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 1041 if (error != 0) 1042 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 1043 1044 bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr)); 1045 bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask)); 1046 clear_sinaddr(&ifra->ifra_broadaddr); 1047 ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr | 1048 ~netmask->sin_addr.s_addr; 1049 1050 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 1051 if (error != 0) 1052 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 1053 1054 /* Add new default route */ 1055 1056 if (ifctx->gotgw != 0 || gctx->gotgw == 0) { 1057 clear_sinaddr(&defdst); 1058 clear_sinaddr(&defmask); 1059 /* XXX MRT just table 0 */ 1060 error = rtrequest_fib(RTM_ADD, 1061 (struct sockaddr *) &defdst, (struct sockaddr *) gw, 1062 (struct sockaddr *) &defmask, 1063 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB); 1064 if (error != 0) { 1065 printf("%s: RTM_ADD, error=%d\n", __func__, error); 1066 return (error); 1067 } 1068 } 1069 1070 return (0); 1071 } 1072 1073 static int 1074 setfs(struct sockaddr_in *addr, char *path, char *p, 1075 const struct in_addr *siaddr) 1076 { 1077 1078 if (getip(&p, &addr->sin_addr) == 0) { 1079 if (siaddr != NULL && *p == '/') 1080 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr)); 1081 else 1082 return 0; 1083 } else { 1084 if (*p != ':') 1085 return 0; 1086 p++; 1087 } 1088 1089 addr->sin_len = sizeof(struct sockaddr_in); 1090 addr->sin_family = AF_INET; 1091 1092 strlcpy(path, p, MNAMELEN); 1093 return 1; 1094 } 1095 1096 static int 1097 getip(char **ptr, struct in_addr *addr) 1098 { 1099 char *p; 1100 unsigned int ip; 1101 int val; 1102 1103 p = *ptr; 1104 ip = 0; 1105 if (((val = getdec(&p)) < 0) || (val > 255)) 1106 return 0; 1107 ip = val << 24; 1108 if (*p != '.') 1109 return 0; 1110 p++; 1111 if (((val = getdec(&p)) < 0) || (val > 255)) 1112 return 0; 1113 ip |= (val << 16); 1114 if (*p != '.') 1115 return 0; 1116 p++; 1117 if (((val = getdec(&p)) < 0) || (val > 255)) 1118 return 0; 1119 ip |= (val << 8); 1120 if (*p != '.') 1121 return 0; 1122 p++; 1123 if (((val = getdec(&p)) < 0) || (val > 255)) 1124 return 0; 1125 ip |= val; 1126 1127 addr->s_addr = htonl(ip); 1128 *ptr = p; 1129 return 1; 1130 } 1131 1132 static int 1133 getdec(char **ptr) 1134 { 1135 char *p; 1136 int ret; 1137 1138 p = *ptr; 1139 ret = 0; 1140 if ((*p < '') || (*p > '9')) 1141 return -1; 1142 while ((*p >= '') && (*p <= '9')) { 1143 ret = ret * 10 + (*p - ''); 1144 p++; 1145 } 1146 *ptr = p; 1147 return ret; 1148 } 1149 1150 static void 1151 mountopts(struct nfs_args *args, char *p) 1152 { 1153 args->version = NFS_ARGSVERSION; 1154 args->rsize = BOOTP_BLOCKSIZE; 1155 args->wsize = BOOTP_BLOCKSIZE; 1156 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 1157 args->sotype = SOCK_DGRAM; 1158 if (p != NULL) 1159 nfs_parse_options(p, args); 1160 } 1161 1162 static int 1163 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 1164 { 1165 struct mbuf *m; 1166 int alignedlen; 1167 1168 m = *mptr; 1169 alignedlen = ( len + 3 ) & ~3; 1170 1171 if (m->m_len < alignedlen) { 1172 m = m_pullup(m, alignedlen); 1173 if (m == NULL) { 1174 *mptr = NULL; 1175 return EBADRPC; 1176 } 1177 } 1178 bcopy(mtod(m, u_char *), buf, len); 1179 m_adj(m, alignedlen); 1180 *mptr = m; 1181 return 0; 1182 } 1183 1184 static int 1185 xdr_int_decode(struct mbuf **mptr, int *iptr) 1186 { 1187 u_int32_t i; 1188 1189 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 1190 return EBADRPC; 1191 *iptr = fxdr_unsigned(u_int32_t, i); 1192 return 0; 1193 } 1194 1195 static void 1196 print_sin_addr(struct sockaddr_in *sin) 1197 { 1198 1199 print_in_addr(sin->sin_addr); 1200 } 1201 1202 static void 1203 print_in_addr(struct in_addr addr) 1204 { 1205 unsigned int ip; 1206 1207 ip = ntohl(addr.s_addr); 1208 printf("%d.%d.%d.%d", 1209 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); 1210 } 1211 1212 static void 1213 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td) 1214 { 1215 unsigned char *vendp; 1216 unsigned char vendor_client[64]; 1217 uint32_t leasetime; 1218 uint8_t vendor_client_len; 1219 1220 ifctx->gotrootpath = 0; 1221 1222 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call)); 1223 1224 /* bootpc part */ 1225 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */ 1226 ifctx->call.htype = 1; /* 10mb ethernet */ 1227 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */ 1228 ifctx->call.hops = 0; 1229 if (bootpc_ifctx_isunresolved(ifctx) != 0) 1230 ifctx->xid++; 1231 ifctx->call.xid = txdr_unsigned(ifctx->xid); 1232 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); 1233 1234 vendp = ifctx->call.vend; 1235 *vendp++ = 99; /* RFC1048 cookie */ 1236 *vendp++ = 130; 1237 *vendp++ = 83; 1238 *vendp++ = 99; 1239 *vendp++ = TAG_MAXMSGSIZE; 1240 *vendp++ = 2; 1241 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; 1242 *vendp++ = sizeof(struct bootp_packet) & 255; 1243 1244 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", 1245 ostype, MACHINE, osrelease); 1246 vendor_client_len = strlen(vendor_client); 1247 *vendp++ = TAG_VENDOR_INDENTIFIER; 1248 *vendp++ = vendor_client_len; 1249 memcpy(vendp, vendor_client, vendor_client_len); 1250 vendp += vendor_client_len; 1251 ifctx->dhcpquerytype = DHCP_NOMSG; 1252 switch (ifctx->state) { 1253 case IF_DHCP_UNRESOLVED: 1254 *vendp++ = TAG_DHCP_MSGTYPE; 1255 *vendp++ = 1; 1256 *vendp++ = DHCP_DISCOVER; 1257 ifctx->dhcpquerytype = DHCP_DISCOVER; 1258 ifctx->gotdhcpserver = 0; 1259 break; 1260 case IF_DHCP_OFFERED: 1261 *vendp++ = TAG_DHCP_MSGTYPE; 1262 *vendp++ = 1; 1263 *vendp++ = DHCP_REQUEST; 1264 ifctx->dhcpquerytype = DHCP_REQUEST; 1265 *vendp++ = TAG_DHCP_REQ_ADDR; 1266 *vendp++ = 4; 1267 memcpy(vendp, &ifctx->reply.yiaddr, 4); 1268 vendp += 4; 1269 if (ifctx->gotdhcpserver != 0) { 1270 *vendp++ = TAG_DHCP_SERVERID; 1271 *vendp++ = 4; 1272 memcpy(vendp, &ifctx->dhcpserver, 4); 1273 vendp += 4; 1274 } 1275 *vendp++ = TAG_DHCP_LEASETIME; 1276 *vendp++ = 4; 1277 leasetime = htonl(300); 1278 memcpy(vendp, &leasetime, 4); 1279 vendp += 4; 1280 break; 1281 default: 1282 break; 1283 } 1284 *vendp = TAG_END; 1285 1286 ifctx->call.secs = 0; 1287 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */ 1288 } 1289 1290 static int 1291 bootpc_hascookie(struct bootp_packet *bp) 1292 { 1293 1294 return (bp->vend[0] == 99 && bp->vend[1] == 130 && 1295 bp->vend[2] == 83 && bp->vend[3] == 99); 1296 } 1297 1298 static void 1299 bootpc_tag_helper(struct bootpc_tagcontext *tctx, 1300 unsigned char *start, int len, int tag) 1301 { 1302 unsigned char *j; 1303 unsigned char *ej; 1304 unsigned char code; 1305 1306 if (tctx->badtag != 0 || tctx->badopt != 0) 1307 return; 1308 1309 j = start; 1310 ej = j + len; 1311 1312 while (j < ej) { 1313 code = *j++; 1314 if (code == TAG_PAD) 1315 continue; 1316 if (code == TAG_END) 1317 return; 1318 if (j >= ej || j + *j + 1 > ej) { 1319 tctx->badopt = 1; 1320 return; 1321 } 1322 len = *j++; 1323 if (code == tag) { 1324 if (tctx->taglen + len > TAG_MAXLEN) { 1325 tctx->badtag = 1; 1326 return; 1327 } 1328 tctx->foundopt = 1; 1329 if (len > 0) 1330 memcpy(tctx->buf + tctx->taglen, 1331 j, len); 1332 tctx->taglen += len; 1333 } 1334 if (code == TAG_OVERLOAD) 1335 tctx->overload = *j; 1336 1337 j += len; 1338 } 1339 } 1340 1341 static unsigned char * 1342 bootpc_tag(struct bootpc_tagcontext *tctx, 1343 struct bootp_packet *bp, int len, int tag) 1344 { 1345 tctx->overload = 0; 1346 tctx->badopt = 0; 1347 tctx->badtag = 0; 1348 tctx->foundopt = 0; 1349 tctx->taglen = 0; 1350 1351 if (bootpc_hascookie(bp) == 0) 1352 return NULL; 1353 1354 bootpc_tag_helper(tctx, &bp->vend[4], 1355 (unsigned char *) bp + len - &bp->vend[4], tag); 1356 1357 if ((tctx->overload & OVERLOAD_FILE) != 0) 1358 bootpc_tag_helper(tctx, 1359 (unsigned char *) bp->file, 1360 sizeof(bp->file), 1361 tag); 1362 if ((tctx->overload & OVERLOAD_SNAME) != 0) 1363 bootpc_tag_helper(tctx, 1364 (unsigned char *) bp->sname, 1365 sizeof(bp->sname), 1366 tag); 1367 1368 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0) 1369 return NULL; 1370 tctx->buf[tctx->taglen] = '\0'; 1371 return tctx->buf; 1372 } 1373 1374 static void 1375 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx, 1376 struct bootpc_globalcontext *gctx) 1377 { 1378 char *p, *s; 1379 unsigned int ip; 1380 1381 ifctx->gotgw = 0; 1382 ifctx->gotnetmask = 0; 1383 1384 clear_sinaddr(&ifctx->myaddr); 1385 clear_sinaddr(&ifctx->netmask); 1386 clear_sinaddr(&ifctx->gw); 1387 1388 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1389 1390 ip = ntohl(ifctx->myaddr.sin_addr.s_addr); 1391 1392 printf("%s at ", ifctx->ireq.ifr_name); 1393 print_sin_addr(&ifctx->myaddr); 1394 printf(" server "); 1395 print_in_addr(ifctx->reply.siaddr); 1396 1397 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1398 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1399 printf(" via gateway "); 1400 print_in_addr(ifctx->reply.giaddr); 1401 } 1402 1403 /* This call used for the side effect (overload flag) */ 1404 (void) bootpc_tag(&gctx->tmptag, 1405 &ifctx->reply, ifctx->replylen, TAG_END); 1406 1407 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1408 if (ifctx->reply.sname[0] != '\0') 1409 printf(" server name %s", ifctx->reply.sname); 1410 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1411 if (ifctx->reply.file[0] != '\0') 1412 printf(" boot file %s", ifctx->reply.file); 1413 1414 printf("\n"); 1415 1416 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1417 TAG_SUBNETMASK); 1418 if (p != NULL) { 1419 if (gctx->tag.taglen != 4) 1420 panic("bootpc: subnet mask len is %d", 1421 gctx->tag.taglen); 1422 bcopy(p, &ifctx->netmask.sin_addr, 4); 1423 ifctx->gotnetmask = 1; 1424 printf("subnet mask "); 1425 print_sin_addr(&ifctx->netmask); 1426 printf(" "); 1427 } 1428 1429 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1430 TAG_ROUTERS); 1431 if (p != NULL) { 1432 /* Routers */ 1433 if (gctx->tag.taglen % 4) 1434 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1435 if (gctx->tag.taglen > 0) { 1436 bcopy(p, &ifctx->gw.sin_addr, 4); 1437 printf("router "); 1438 print_sin_addr(&ifctx->gw); 1439 printf(" "); 1440 ifctx->gotgw = 1; 1441 gctx->gotgw = 1; 1442 } 1443 } 1444 1445 /* 1446 * Choose a root filesystem. If a value is forced in the environment 1447 * and it contains "nfs:", use it unconditionally. Otherwise, if the 1448 * kernel is compiled with the ROOTDEVNAME option, then use it if: 1449 * - The server doesn't provide a pathname. 1450 * - The boothowto flags include RB_DFLTROOT (user said to override 1451 * the server value). 1452 */ 1453 p = NULL; 1454 if ((s = getenv("vfs.root.mountfrom")) != NULL) { 1455 if ((p = strstr(s, "nfs:")) != NULL) 1456 p = strdup(p + 4, M_TEMP); 1457 freeenv(s); 1458 } 1459 if (p == NULL) { 1460 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1461 TAG_ROOT); 1462 } 1463 #ifdef ROOTDEVNAME 1464 if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) && 1465 (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) { 1466 p += 4; 1467 } 1468 #endif 1469 if (p != NULL) { 1470 if (gctx->setrootfs != NULL) { 1471 printf("rootfs %s (ignored) ", p); 1472 } else if (setfs(&nd->root_saddr, 1473 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1474 if (*p == '/') { 1475 printf("root_server "); 1476 print_sin_addr(&nd->root_saddr); 1477 printf(" "); 1478 } 1479 printf("rootfs %s ", p); 1480 gctx->gotrootpath = 1; 1481 ifctx->gotrootpath = 1; 1482 gctx->setrootfs = ifctx; 1483 1484 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1485 ifctx->replylen, 1486 TAG_ROOTOPTS); 1487 if (p != NULL) { 1488 mountopts(&nd->root_args, p); 1489 printf("rootopts %s ", p); 1490 } 1491 } else 1492 panic("Failed to set rootfs to %s", p); 1493 } 1494 1495 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1496 TAG_HOSTNAME); 1497 if (p != NULL) { 1498 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1499 panic("bootpc: hostname >= %d bytes", 1500 MAXHOSTNAMELEN); 1501 if (gctx->sethostname != NULL) { 1502 printf("hostname %s (ignored) ", p); 1503 } else { 1504 strcpy(nd->my_hostnam, p); 1505 mtx_lock(&prison0.pr_mtx); 1506 strcpy(prison0.pr_hostname, p); 1507 mtx_unlock(&prison0.pr_mtx); 1508 printf("hostname %s ", p); 1509 gctx->sethostname = ifctx; 1510 } 1511 } 1512 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1513 TAG_COOKIE); 1514 if (p != NULL) { /* store in a sysctl variable */ 1515 int i, l = sizeof(bootp_cookie) - 1; 1516 for (i = 0; i < l && p[i] != '\0'; i++) 1517 bootp_cookie[i] = p[i]; 1518 p[i] = '\0'; 1519 } 1520 1521 1522 printf("\n"); 1523 1524 if (ifctx->gotnetmask == 0) { 1525 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1526 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1527 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1528 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1529 else 1530 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1531 } 1532 if (ifctx->gotgw == 0) { 1533 /* Use proxyarp */ 1534 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr; 1535 } 1536 } 1537 1538 void 1539 bootpc_init(void) 1540 { 1541 struct bootpc_ifcontext *ifctx; /* Interface BOOTP contexts */ 1542 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1543 struct ifnet *ifp; 1544 struct sockaddr_dl *sdl; 1545 struct ifaddr *ifa; 1546 int error; 1547 #ifndef BOOTP_WIRED_TO 1548 int ifcnt; 1549 #endif 1550 struct nfsv3_diskless *nd; 1551 struct thread *td; 1552 int timeout; 1553 int delay; 1554 1555 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz; 1556 delay = hz / 10; 1557 1558 nd = &nfsv3_diskless; 1559 td = curthread; 1560 1561 /* 1562 * If already filled in, don't touch it here 1563 */ 1564 if (nfs_diskless_valid != 0) 1565 return; 1566 1567 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1568 STAILQ_INIT(&gctx->interfaces); 1569 gctx->xid = ~0xFFFF; 1570 gctx->starttime = time_second; 1571 1572 /* 1573 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have 1574 * root-path overrides that can potentially let us boot even if we don't 1575 * get a root path from the server, so we can treat that as a non-error. 1576 */ 1577 #ifdef ROOTDEVNAME 1578 gctx->any_root_overrides = 1; 1579 #else 1580 gctx->any_root_overrides = testenv("vfs.root.mountfrom"); 1581 #endif 1582 1583 /* 1584 * Find a network interface. 1585 */ 1586 CURVNET_SET(TD_TO_VNET(td)); 1587 #ifdef BOOTP_WIRED_TO 1588 printf("%s: wired to interface '%s'\n", __func__, 1589 __XSTRING(BOOTP_WIRED_TO)); 1590 allocifctx(gctx); 1591 #else 1592 /* 1593 * Preallocate interface context storage, if another interface 1594 * attaches and wins the race, it won't be eligible for bootp. 1595 */ 1596 ifcnt = 0; 1597 IFNET_RLOCK(); 1598 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1599 if ((ifp->if_flags & 1600 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1601 IFF_BROADCAST) 1602 continue; 1603 switch (ifp->if_alloctype) { 1604 case IFT_ETHER: 1605 case IFT_FDDI: 1606 case IFT_ISO88025: 1607 break; 1608 default: 1609 continue; 1610 } 1611 ifcnt++; 1612 } 1613 IFNET_RUNLOCK(); 1614 if (ifcnt == 0) 1615 panic("%s: no eligible interfaces", __func__); 1616 for (; ifcnt > 0; ifcnt--) 1617 allocifctx(gctx); 1618 #endif 1619 1620 retry: 1621 ifctx = STAILQ_FIRST(&gctx->interfaces); 1622 IFNET_RLOCK(); 1623 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1624 if (ifctx == NULL) 1625 break; 1626 #ifdef BOOTP_WIRED_TO 1627 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0) 1628 continue; 1629 #else 1630 if ((ifp->if_flags & 1631 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1632 IFF_BROADCAST) 1633 continue; 1634 switch (ifp->if_alloctype) { 1635 case IFT_ETHER: 1636 case IFT_FDDI: 1637 case IFT_ISO88025: 1638 break; 1639 default: 1640 continue; 1641 } 1642 #endif 1643 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1644 sizeof(ifctx->ireq.ifr_name)); 1645 ifctx->ifp = ifp; 1646 1647 /* Get HW address */ 1648 sdl = NULL; 1649 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1650 if (ifa->ifa_addr->sa_family == AF_LINK) { 1651 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1652 if (sdl->sdl_type == IFT_ETHER) 1653 break; 1654 } 1655 if (sdl == NULL) 1656 panic("bootpc: Unable to find HW address for %s", 1657 ifctx->ireq.ifr_name); 1658 ifctx->sdl = sdl; 1659 1660 ifctx = STAILQ_NEXT(ifctx, next); 1661 } 1662 IFNET_RUNLOCK(); 1663 CURVNET_RESTORE(); 1664 1665 if (STAILQ_EMPTY(&gctx->interfaces) || 1666 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) { 1667 if (timeout > 0) { 1668 pause("bootpc", delay); 1669 timeout -= delay; 1670 goto retry; 1671 } 1672 #ifdef BOOTP_WIRED_TO 1673 panic("%s: Could not find interface specified " 1674 "by BOOTP_WIRED_TO: " 1675 __XSTRING(BOOTP_WIRED_TO), __func__); 1676 #else 1677 panic("%s: no suitable interface", __func__); 1678 #endif 1679 } 1680 1681 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td); 1682 if (error != 0) 1683 panic("%s: socreate, error=%d", __func__, error); 1684 1685 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1686 bootpc_fakeup_interface(ifctx, td); 1687 1688 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1689 bootpc_compose_query(ifctx, td); 1690 1691 error = bootpc_call(gctx, td); 1692 if (error != 0) { 1693 printf("BOOTP call failed\n"); 1694 } 1695 1696 mountopts(&nd->root_args, NULL); 1697 1698 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1699 if (bootpc_ifctx_isresolved(ifctx) != 0) 1700 bootpc_decode_reply(nd, ifctx, gctx); 1701 1702 #ifdef BOOTP_NFSROOT 1703 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0) 1704 panic("bootpc: No root path offered"); 1705 #endif 1706 1707 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1708 bootpc_adjust_interface(ifctx, gctx, td); 1709 1710 soclose(bootp_so); 1711 1712 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1713 if (ifctx->gotrootpath != 0) 1714 break; 1715 if (ifctx == NULL) { 1716 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1717 if (bootpc_ifctx_isresolved(ifctx) != 0) 1718 break; 1719 } 1720 if (ifctx == NULL) 1721 goto out; 1722 1723 if (gctx->gotrootpath != 0) { 1724 1725 setenv("boot.netif.name", ifctx->ifp->if_xname); 1726 1727 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1728 nd->root_fh, &nd->root_fhsize, 1729 &nd->root_args, td); 1730 if (error != 0) { 1731 if (gctx->any_root_overrides == 0) 1732 panic("nfs_boot: mount root, error=%d", error); 1733 else 1734 goto out; 1735 } 1736 rootdevnames[0] = "nfs:"; 1737 #ifdef NFSCLIENT 1738 rootdevnames[1] = "oldnfs:"; 1739 #endif 1740 nfs_diskless_valid = 3; 1741 } 1742 1743 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1744 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1745 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1746 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1747 ifctx->myaddr.sin_addr.s_addr | 1748 ~ ifctx->netmask.sin_addr.s_addr; 1749 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1750 1751 out: 1752 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) { 1753 STAILQ_REMOVE_HEAD(&gctx->interfaces, next); 1754 free(ifctx, M_TEMP); 1755 } 1756 free(gctx, M_TEMP); 1757 } 1758 1759 /* 1760 * RPC: mountd/mount 1761 * Given a server pathname, get an NFS file handle. 1762 * Also, sets sin->sin_port to the NFS service port. 1763 */ 1764 static int 1765 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1766 struct nfs_args *args, struct thread *td) 1767 { 1768 struct mbuf *m; 1769 int error; 1770 int authunixok; 1771 int authcount; 1772 int authver; 1773 1774 #define RPCPROG_MNT 100005 1775 #define RPCMNT_VER1 1 1776 #define RPCMNT_VER3 3 1777 #define RPCMNT_MOUNT 1 1778 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1779 #define AUTH_UNIX AUTH_SYS 1780 1781 /* XXX honor v2/v3 flags in args->flags? */ 1782 #ifdef BOOTP_NFSV3 1783 /* First try NFS v3 */ 1784 /* Get port number for MOUNTD. */ 1785 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1786 &mdsin->sin_port, td); 1787 if (error == 0) { 1788 m = xdr_string_encode(path, strlen(path)); 1789 1790 /* Do RPC to mountd. */ 1791 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1792 RPCMNT_MOUNT, &m, NULL, td); 1793 } 1794 if (error == 0) { 1795 args->flags |= NFSMNT_NFSV3; 1796 } else { 1797 #endif 1798 /* Fallback to NFS v2 */ 1799 1800 /* Get port number for MOUNTD. */ 1801 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1802 &mdsin->sin_port, td); 1803 if (error != 0) 1804 return error; 1805 1806 m = xdr_string_encode(path, strlen(path)); 1807 1808 /* Do RPC to mountd. */ 1809 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1810 RPCMNT_MOUNT, &m, NULL, td); 1811 if (error != 0) 1812 return error; /* message already freed */ 1813 1814 #ifdef BOOTP_NFSV3 1815 } 1816 #endif 1817 1818 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1819 goto bad; 1820 1821 if ((args->flags & NFSMNT_NFSV3) != 0) { 1822 if (xdr_int_decode(&m, fhsizep) != 0 || 1823 *fhsizep > NFSX_V3FHMAX || 1824 *fhsizep <= 0) 1825 goto bad; 1826 } else 1827 *fhsizep = NFSX_V2FH; 1828 1829 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1830 goto bad; 1831 1832 if (args->flags & NFSMNT_NFSV3) { 1833 if (xdr_int_decode(&m, &authcount) != 0) 1834 goto bad; 1835 authunixok = 0; 1836 if (authcount < 0 || authcount > 100) 1837 goto bad; 1838 while (authcount > 0) { 1839 if (xdr_int_decode(&m, &authver) != 0) 1840 goto bad; 1841 if (authver == AUTH_UNIX) 1842 authunixok = 1; 1843 authcount--; 1844 } 1845 if (authunixok == 0) 1846 goto bad; 1847 } 1848 1849 /* Set port number for NFS use. */ 1850 error = krpc_portmap(mdsin, NFS_PROG, 1851 (args->flags & 1852 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1853 &mdsin->sin_port, td); 1854 1855 goto out; 1856 1857 bad: 1858 error = EBADRPC; 1859 1860 out: 1861 m_freem(m); 1862 return error; 1863 } 1864 1865 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
Cache object: 629f315b4c7f5db05c5f4a9c9ac47dc8
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