bootp_subr.c revision 1.1.1.1.10.2
1 /* $NetBSD: bootp_subr.c,v 1.1.1.1.10.2 2014/08/20 00:04:27 tls Exp $ */ 2 /*- 3 * Copyright (c) 1995 Gordon Ross, Adam Glass 4 * Copyright (c) 1992 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Lawrence Berkeley Laboratory and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * based on: 40 * nfs/krpc_subr.c 41 * NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp 42 */ 43 44 #include <sys/cdefs.h> 45 /* __FBSDID("FreeBSD: head/sys/nfs/bootp_subr.c 253847 2013-07-31 19:14:00Z ian "); */ 46 __RCSID("$NetBSD: bootp_subr.c,v 1.1.1.1.10.2 2014/08/20 00:04:27 tls Exp $"); 47 48 #include "opt_bootp.h" 49 #include "opt_nfs.h" 50 #include "opt_rootdevname.h" 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/jail.h> 55 #include <sys/kernel.h> 56 #include <sys/sockio.h> 57 #include <sys/malloc.h> 58 #include <sys/mount.h> 59 #include <sys/mbuf.h> 60 #include <sys/proc.h> 61 #include <sys/reboot.h> 62 #include <sys/socket.h> 63 #include <sys/socketvar.h> 64 #include <sys/sysctl.h> 65 #include <sys/uio.h> 66 67 #include <net/if.h> 68 #include <net/route.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_var.h> 72 #include <net/if_types.h> 73 #include <net/if_dl.h> 74 #include <net/vnet.h> 75 76 #include <nfs/nfsproto.h> 77 #include <nfsclient/nfs.h> 78 #include <nfs/nfsdiskless.h> 79 #include <nfs/krpc.h> 80 #include <nfs/xdr_subs.h> 81 82 83 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */ 84 85 #ifndef BOOTP_SETTLE_DELAY 86 #define BOOTP_SETTLE_DELAY 3 87 #endif 88 89 /* 90 * Wait 10 seconds for interface appearance 91 * USB ethernet adapters might require some time to pop up 92 */ 93 #ifndef BOOTP_IFACE_WAIT_TIMEOUT 94 #define BOOTP_IFACE_WAIT_TIMEOUT 10 95 #endif 96 97 /* 98 * What is the longest we will wait before re-sending a request? 99 * Note this is also the frequency of "RPC timeout" messages. 100 * The re-send loop count sup linearly to this maximum, so the 101 * first complaint will happen after (1+2+3+4+5)=15 seconds. 102 */ 103 #define MAX_RESEND_DELAY 5 /* seconds */ 104 105 /* Definitions from RFC951 */ 106 struct bootp_packet { 107 u_int8_t op; 108 u_int8_t htype; 109 u_int8_t hlen; 110 u_int8_t hops; 111 u_int32_t xid; 112 u_int16_t secs; 113 u_int16_t flags; 114 struct in_addr ciaddr; 115 struct in_addr yiaddr; 116 struct in_addr siaddr; 117 struct in_addr giaddr; 118 unsigned char chaddr[16]; 119 char sname[64]; 120 char file[128]; 121 unsigned char vend[1222]; 122 }; 123 124 struct bootpc_ifcontext { 125 STAILQ_ENTRY(bootpc_ifcontext) next; 126 struct bootp_packet call; 127 struct bootp_packet reply; 128 int replylen; 129 int overload; 130 union { 131 struct ifreq _ifreq; 132 struct in_aliasreq _in_alias_req; 133 } _req; 134 #define ireq _req._ifreq 135 #define iareq _req._in_alias_req 136 struct ifnet *ifp; 137 struct sockaddr_dl *sdl; 138 struct sockaddr_in myaddr; 139 struct sockaddr_in netmask; 140 struct sockaddr_in gw; 141 int gotgw; 142 int gotnetmask; 143 int gotrootpath; 144 int outstanding; 145 int sentmsg; 146 u_int32_t xid; 147 enum { 148 IF_BOOTP_UNRESOLVED, 149 IF_BOOTP_RESOLVED, 150 IF_BOOTP_FAILED, 151 IF_DHCP_UNRESOLVED, 152 IF_DHCP_OFFERED, 153 IF_DHCP_RESOLVED, 154 IF_DHCP_FAILED, 155 } state; 156 int dhcpquerytype; /* dhcp type sent */ 157 struct in_addr dhcpserver; 158 int gotdhcpserver; 159 }; 160 161 #define TAG_MAXLEN 1024 162 struct bootpc_tagcontext { 163 char buf[TAG_MAXLEN + 1]; 164 int overload; 165 int badopt; 166 int badtag; 167 int foundopt; 168 int taglen; 169 }; 170 171 struct bootpc_globalcontext { 172 STAILQ_HEAD(, bootpc_ifcontext) interfaces; 173 u_int32_t xid; 174 int any_root_overrides; 175 int gotrootpath; 176 int gotgw; 177 int ifnum; 178 int secs; 179 int starttime; 180 struct bootp_packet reply; 181 int replylen; 182 struct bootpc_ifcontext *setrootfs; 183 struct bootpc_ifcontext *sethostname; 184 struct bootpc_tagcontext tmptag; 185 struct bootpc_tagcontext tag; 186 }; 187 188 #define IPPORT_BOOTPC 68 189 #define IPPORT_BOOTPS 67 190 191 #define BOOTP_REQUEST 1 192 #define BOOTP_REPLY 2 193 194 /* Common tags */ 195 #define TAG_PAD 0 /* Pad option, implicit length 1 */ 196 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */ 197 #define TAG_ROUTERS 3 /* Routers (in order of preference) */ 198 #define TAG_HOSTNAME 12 /* Client host name */ 199 #define TAG_ROOT 17 /* Root path */ 200 201 /* DHCP specific tags */ 202 #define TAG_OVERLOAD 52 /* Option Overload */ 203 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */ 204 205 #define TAG_END 255 /* End Option (i.e. no more options) */ 206 207 /* Overload values */ 208 #define OVERLOAD_FILE 1 209 #define OVERLOAD_SNAME 2 210 211 /* Site specific tags: */ 212 #define TAG_ROOTOPTS 130 213 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */ 214 215 #define TAG_DHCP_MSGTYPE 53 216 #define TAG_DHCP_REQ_ADDR 50 217 #define TAG_DHCP_SERVERID 54 218 #define TAG_DHCP_LEASETIME 51 219 220 #define TAG_VENDOR_INDENTIFIER 60 221 222 #define DHCP_NOMSG 0 223 #define DHCP_DISCOVER 1 224 #define DHCP_OFFER 2 225 #define DHCP_REQUEST 3 226 #define DHCP_ACK 5 227 228 /* NFS read/write block size */ 229 #ifndef BOOTP_BLOCKSIZE 230 #define BOOTP_BLOCKSIZE 8192 231 #endif 232 233 static char bootp_cookie[128]; 234 static struct socket *bootp_so; 235 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, 236 bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); 237 238 /* mountd RPC */ 239 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, 240 int *fhsizep, struct nfs_args *args, struct thread *td); 241 static int setfs(struct sockaddr_in *addr, char *path, char *p, 242 const struct in_addr *siaddr); 243 static int getdec(char **ptr); 244 static int getip(char **ptr, struct in_addr *ip); 245 static void mountopts(struct nfs_args *args, char *p); 246 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 247 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 248 static void print_in_addr(struct in_addr addr); 249 static void print_sin_addr(struct sockaddr_in *addr); 250 static void clear_sinaddr(struct sockaddr_in *sin); 251 static void allocifctx(struct bootpc_globalcontext *gctx); 252 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx, 253 struct thread *td); 254 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx, 255 struct bootp_packet *bp, int len, int tag); 256 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx, 257 unsigned char *start, int len, int tag); 258 259 #ifdef BOOTP_DEBUG 260 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma); 261 void bootpboot_p_rtentry(struct rtentry *rt); 262 void bootpboot_p_tree(struct radix_node *rn); 263 void bootpboot_p_rtlist(void); 264 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa); 265 void bootpboot_p_iflist(void); 266 #endif 267 268 static int bootpc_call(struct bootpc_globalcontext *gctx, 269 struct thread *td); 270 271 static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 272 struct thread *td); 273 274 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 275 struct bootpc_globalcontext *gctx, struct thread *td); 276 277 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 278 struct bootpc_ifcontext *ifctx, 279 struct bootpc_globalcontext *gctx); 280 281 static int bootpc_received(struct bootpc_globalcontext *gctx, 282 struct bootpc_ifcontext *ifctx); 283 284 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 285 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 286 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 287 288 /* 289 * In order to have multiple active interfaces with address 0.0.0.0 290 * and be able to send data to a selected interface, we first set 291 * mask to /8 on all interfaces, and temporarily set it to /0 when 292 * doing sosend(). 293 */ 294 295 #ifdef BOOTP_DEBUG 296 void 297 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma) 298 { 299 300 if (sa == NULL) { 301 printf("(sockaddr *) <null>"); 302 return; 303 } 304 switch (sa->sa_family) { 305 case AF_INET: 306 { 307 struct sockaddr_in *sin; 308 309 sin = (struct sockaddr_in *) sa; 310 printf("inet "); 311 print_sin_addr(sin); 312 if (ma != NULL) { 313 sin = (struct sockaddr_in *) ma; 314 printf(" mask "); 315 print_sin_addr(sin); 316 } 317 } 318 break; 319 case AF_LINK: 320 { 321 struct sockaddr_dl *sli; 322 int i; 323 324 sli = (struct sockaddr_dl *) sa; 325 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data); 326 for (i = 0; i < sli->sdl_alen; i++) { 327 if (i > 0) 328 printf(":"); 329 printf("%x", ((unsigned char *) LLADDR(sli))[i]); 330 } 331 } 332 break; 333 default: 334 printf("af%d", sa->sa_family); 335 } 336 } 337 338 void 339 bootpboot_p_rtentry(struct rtentry *rt) 340 { 341 342 bootpboot_p_sa(rt_key(rt), rt_mask(rt)); 343 printf(" "); 344 bootpboot_p_sa(rt->rt_gateway, NULL); 345 printf(" "); 346 printf("flags %x", (unsigned short) rt->rt_flags); 347 printf(" %d", (int) rt->rt_rmx.rmx_expire); 348 printf(" %s\n", rt->rt_ifp->if_xname); 349 } 350 351 void 352 bootpboot_p_tree(struct radix_node *rn) 353 { 354 355 while (rn != NULL) { 356 if (rn->rn_bit < 0) { 357 if ((rn->rn_flags & RNF_ROOT) != 0) { 358 } else { 359 bootpboot_p_rtentry((struct rtentry *) rn); 360 } 361 rn = rn->rn_dupedkey; 362 } else { 363 bootpboot_p_tree(rn->rn_left); 364 bootpboot_p_tree(rn->rn_right); 365 return; 366 } 367 } 368 } 369 370 void 371 bootpboot_p_rtlist(void) 372 { 373 struct radix_node_head *rnh; 374 375 printf("Routing table:\n"); 376 rnh = rt_tables_get_rnh(0, AF_INET); 377 if (rnh == NULL) 378 return; 379 RADIX_NODE_HEAD_RLOCK(rnh); /* could sleep XXX */ 380 bootpboot_p_tree(rnh->rnh_treetop); 381 RADIX_NODE_HEAD_RUNLOCK(rnh); 382 } 383 384 void 385 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 386 { 387 388 printf("%s flags %x, addr ", 389 ifp->if_xname, ifp->if_flags); 390 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 391 printf(", broadcast "); 392 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 393 printf(", netmask "); 394 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 395 printf("\n"); 396 } 397 398 void 399 bootpboot_p_iflist(void) 400 { 401 struct ifnet *ifp; 402 struct ifaddr *ifa; 403 404 printf("Interface list:\n"); 405 IFNET_RLOCK(); 406 for (ifp = TAILQ_FIRST(&V_ifnet); 407 ifp != NULL; 408 ifp = TAILQ_NEXT(ifp, if_link)) { 409 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); 410 ifa != NULL; 411 ifa = TAILQ_NEXT(ifa, ifa_link)) 412 if (ifa->ifa_addr->sa_family == AF_INET) 413 bootpboot_p_if(ifp, ifa); 414 } 415 IFNET_RUNLOCK(); 416 } 417 #endif /* defined(BOOTP_DEBUG) */ 418 419 static void 420 clear_sinaddr(struct sockaddr_in *sin) 421 { 422 423 bzero(sin, sizeof(*sin)); 424 sin->sin_len = sizeof(*sin); 425 sin->sin_family = AF_INET; 426 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 427 sin->sin_port = 0; 428 } 429 430 static void 431 allocifctx(struct bootpc_globalcontext *gctx) 432 { 433 struct bootpc_ifcontext *ifctx; 434 435 ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO); 436 ifctx->xid = gctx->xid; 437 #ifdef BOOTP_NO_DHCP 438 ifctx->state = IF_BOOTP_UNRESOLVED; 439 #else 440 ifctx->state = IF_DHCP_UNRESOLVED; 441 #endif 442 gctx->xid += 0x100; 443 STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next); 444 } 445 446 static __inline int 447 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 448 { 449 450 if (ifctx->state == IF_BOOTP_RESOLVED || 451 ifctx->state == IF_DHCP_RESOLVED) 452 return 1; 453 return 0; 454 } 455 456 static __inline int 457 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 458 { 459 460 if (ifctx->state == IF_BOOTP_UNRESOLVED || 461 ifctx->state == IF_DHCP_UNRESOLVED) 462 return 1; 463 return 0; 464 } 465 466 static __inline int 467 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 468 { 469 470 if (ifctx->state == IF_BOOTP_FAILED || 471 ifctx->state == IF_DHCP_FAILED) 472 return 1; 473 return 0; 474 } 475 476 static int 477 bootpc_received(struct bootpc_globalcontext *gctx, 478 struct bootpc_ifcontext *ifctx) 479 { 480 unsigned char dhcpreplytype; 481 char *p; 482 483 /* 484 * Need timeout for fallback to less 485 * desirable alternative. 486 */ 487 488 /* This call used for the side effect (badopt flag) */ 489 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 490 gctx->replylen, 491 TAG_END); 492 493 /* If packet is invalid, ignore it */ 494 if (gctx->tmptag.badopt != 0) 495 return 0; 496 497 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 498 gctx->replylen, TAG_DHCP_MSGTYPE); 499 if (p != NULL) 500 dhcpreplytype = *p; 501 else 502 dhcpreplytype = DHCP_NOMSG; 503 504 switch (ifctx->dhcpquerytype) { 505 case DHCP_DISCOVER: 506 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 507 #ifndef BOOTP_FORCE_DHCP 508 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 509 #endif 510 ) 511 return 0; 512 break; 513 case DHCP_REQUEST: 514 if (dhcpreplytype != DHCP_ACK) 515 return 0; 516 case DHCP_NOMSG: 517 break; 518 } 519 520 /* Ignore packet unless it gives us a root tag we didn't have */ 521 522 if ((ifctx->state == IF_BOOTP_RESOLVED || 523 (ifctx->dhcpquerytype == DHCP_DISCOVER && 524 (ifctx->state == IF_DHCP_OFFERED || 525 ifctx->state == IF_DHCP_RESOLVED))) && 526 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 527 ifctx->replylen, 528 TAG_ROOT) != NULL || 529 bootpc_tag(&gctx->tmptag, &gctx->reply, 530 gctx->replylen, 531 TAG_ROOT) == NULL)) 532 return 0; 533 534 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 535 ifctx->replylen = gctx->replylen; 536 537 /* XXX: Only reset if 'perfect' response */ 538 if (ifctx->state == IF_BOOTP_UNRESOLVED) 539 ifctx->state = IF_BOOTP_RESOLVED; 540 else if (ifctx->state == IF_DHCP_UNRESOLVED && 541 ifctx->dhcpquerytype == DHCP_DISCOVER) { 542 if (dhcpreplytype == DHCP_OFFER) 543 ifctx->state = IF_DHCP_OFFERED; 544 else 545 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 546 } else if (ifctx->state == IF_DHCP_OFFERED && 547 ifctx->dhcpquerytype == DHCP_REQUEST) 548 ifctx->state = IF_DHCP_RESOLVED; 549 550 551 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 552 ifctx->state != IF_BOOTP_RESOLVED) { 553 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 554 ifctx->replylen, TAG_DHCP_SERVERID); 555 if (p != NULL && gctx->tmptag.taglen == 4) { 556 memcpy(&ifctx->dhcpserver, p, 4); 557 ifctx->gotdhcpserver = 1; 558 } else 559 ifctx->gotdhcpserver = 0; 560 return 1; 561 } 562 563 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 564 ifctx->replylen, 565 TAG_ROOT) != NULL); 566 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 567 ifctx->replylen, 568 TAG_ROUTERS) != NULL); 569 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 570 ifctx->replylen, 571 TAG_SUBNETMASK) != NULL); 572 return 1; 573 } 574 575 static int 576 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 577 { 578 struct sockaddr_in *sin, dst; 579 struct uio auio; 580 struct sockopt sopt; 581 struct iovec aio; 582 int error, on, rcvflg, timo, len; 583 time_t atimo; 584 time_t rtimo; 585 struct timeval tv; 586 struct bootpc_ifcontext *ifctx; 587 int outstanding; 588 int gotrootpath; 589 int retry; 590 const char *s; 591 592 tv.tv_sec = 1; 593 tv.tv_usec = 0; 594 bzero(&sopt, sizeof(sopt)); 595 sopt.sopt_dir = SOPT_SET; 596 sopt.sopt_level = SOL_SOCKET; 597 sopt.sopt_name = SO_RCVTIMEO; 598 sopt.sopt_val = &tv; 599 sopt.sopt_valsize = sizeof tv; 600 601 error = sosetopt(bootp_so, &sopt); 602 if (error != 0) 603 goto out; 604 605 /* 606 * Enable broadcast. 607 */ 608 on = 1; 609 sopt.sopt_name = SO_BROADCAST; 610 sopt.sopt_val = &on; 611 sopt.sopt_valsize = sizeof on; 612 613 error = sosetopt(bootp_so, &sopt); 614 if (error != 0) 615 goto out; 616 617 /* 618 * Disable routing. 619 */ 620 621 on = 1; 622 sopt.sopt_name = SO_DONTROUTE; 623 sopt.sopt_val = &on; 624 sopt.sopt_valsize = sizeof on; 625 626 error = sosetopt(bootp_so, &sopt); 627 if (error != 0) 628 goto out; 629 630 /* 631 * Bind the local endpoint to a bootp client port. 632 */ 633 sin = &dst; 634 clear_sinaddr(sin); 635 sin->sin_port = htons(IPPORT_BOOTPC); 636 error = sobind(bootp_so, (struct sockaddr *)sin, td); 637 if (error != 0) { 638 printf("bind failed\n"); 639 goto out; 640 } 641 642 /* 643 * Setup socket address for the server. 644 */ 645 sin = &dst; 646 clear_sinaddr(sin); 647 sin->sin_addr.s_addr = INADDR_BROADCAST; 648 sin->sin_port = htons(IPPORT_BOOTPS); 649 650 /* 651 * Send it, repeatedly, until a reply is received, 652 * but delay each re-send by an increasing amount. 653 * If the delay hits the maximum, start complaining. 654 */ 655 timo = 0; 656 rtimo = 0; 657 for (;;) { 658 659 outstanding = 0; 660 gotrootpath = 0; 661 662 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 663 if (bootpc_ifctx_isresolved(ifctx) != 0 && 664 bootpc_tag(&gctx->tmptag, &ifctx->reply, 665 ifctx->replylen, 666 TAG_ROOT) != NULL) 667 gotrootpath = 1; 668 } 669 670 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 671 struct in_aliasreq *ifra = &ifctx->iareq; 672 sin = (struct sockaddr_in *)&ifra->ifra_mask; 673 674 ifctx->outstanding = 0; 675 if (bootpc_ifctx_isresolved(ifctx) != 0 && 676 gotrootpath != 0) { 677 continue; 678 } 679 if (bootpc_ifctx_isfailed(ifctx) != 0) 680 continue; 681 682 outstanding++; 683 ifctx->outstanding = 1; 684 685 /* Proceed to next step in DHCP negotiation */ 686 if ((ifctx->state == IF_DHCP_OFFERED && 687 ifctx->dhcpquerytype != DHCP_REQUEST) || 688 (ifctx->state == IF_DHCP_UNRESOLVED && 689 ifctx->dhcpquerytype != DHCP_DISCOVER) || 690 (ifctx->state == IF_BOOTP_UNRESOLVED && 691 ifctx->dhcpquerytype != DHCP_NOMSG)) { 692 ifctx->sentmsg = 0; 693 bootpc_compose_query(ifctx, td); 694 } 695 696 /* Send BOOTP request (or re-send). */ 697 698 if (ifctx->sentmsg == 0) { 699 switch(ifctx->dhcpquerytype) { 700 case DHCP_DISCOVER: 701 s = "DHCP Discover"; 702 break; 703 case DHCP_REQUEST: 704 s = "DHCP Request"; 705 break; 706 case DHCP_NOMSG: 707 default: 708 s = "BOOTP Query"; 709 break; 710 } 711 printf("Sending %s packet from " 712 "interface %s (%*D)\n", 713 s, 714 ifctx->ireq.ifr_name, 715 ifctx->sdl->sdl_alen, 716 (unsigned char *) LLADDR(ifctx->sdl), 717 ":"); 718 ifctx->sentmsg = 1; 719 } 720 721 aio.iov_base = (caddr_t) &ifctx->call; 722 aio.iov_len = sizeof(ifctx->call); 723 724 auio.uio_iov = &aio; 725 auio.uio_iovcnt = 1; 726 auio.uio_segflg = UIO_SYSSPACE; 727 auio.uio_rw = UIO_WRITE; 728 auio.uio_offset = 0; 729 auio.uio_resid = sizeof(ifctx->call); 730 auio.uio_td = td; 731 732 /* Set netmask to 0.0.0.0 */ 733 clear_sinaddr(sin); 734 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 735 td); 736 if (error != 0) 737 panic("%s: SIOCAIFADDR, error=%d", __func__, 738 error); 739 740 error = sosend(bootp_so, (struct sockaddr *) &dst, 741 &auio, NULL, NULL, 0, td); 742 if (error != 0) 743 printf("%s: sosend: %d state %08x\n", __func__, 744 error, (int )bootp_so->so_state); 745 746 /* Set netmask to 255.0.0.0 */ 747 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET); 748 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 749 td); 750 if (error != 0) 751 panic("%s: SIOCAIFADDR, error=%d", __func__, 752 error); 753 } 754 755 if (outstanding == 0 && 756 (rtimo == 0 || time_second >= rtimo)) { 757 error = 0; 758 goto out; 759 } 760 761 /* Determine new timeout. */ 762 if (timo < MAX_RESEND_DELAY) 763 timo++; 764 else { 765 printf("DHCP/BOOTP timeout for server "); 766 print_sin_addr(&dst); 767 printf("\n"); 768 } 769 770 /* 771 * Wait for up to timo seconds for a reply. 772 * The socket receive timeout was set to 1 second. 773 */ 774 atimo = timo + time_second; 775 while (time_second < atimo) { 776 aio.iov_base = (caddr_t) &gctx->reply; 777 aio.iov_len = sizeof(gctx->reply); 778 779 auio.uio_iov = &aio; 780 auio.uio_iovcnt = 1; 781 auio.uio_segflg = UIO_SYSSPACE; 782 auio.uio_rw = UIO_READ; 783 auio.uio_offset = 0; 784 auio.uio_resid = sizeof(gctx->reply); 785 auio.uio_td = td; 786 787 rcvflg = 0; 788 error = soreceive(bootp_so, NULL, &auio, 789 NULL, NULL, &rcvflg); 790 gctx->secs = time_second - gctx->starttime; 791 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 792 if (bootpc_ifctx_isresolved(ifctx) != 0 || 793 bootpc_ifctx_isfailed(ifctx) != 0) 794 continue; 795 796 ifctx->call.secs = htons(gctx->secs); 797 } 798 if (error == EWOULDBLOCK) 799 continue; 800 if (error != 0) 801 goto out; 802 len = sizeof(gctx->reply) - auio.uio_resid; 803 804 /* Do we have the required number of bytes ? */ 805 if (len < BOOTP_MIN_LEN) 806 continue; 807 gctx->replylen = len; 808 809 /* Is it a reply? */ 810 if (gctx->reply.op != BOOTP_REPLY) 811 continue; 812 813 /* Is this an answer to our query */ 814 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 815 if (gctx->reply.xid != ifctx->call.xid) 816 continue; 817 818 /* Same HW address size ? */ 819 if (gctx->reply.hlen != ifctx->call.hlen) 820 continue; 821 822 /* Correct HW address ? */ 823 if (bcmp(gctx->reply.chaddr, 824 ifctx->call.chaddr, 825 ifctx->call.hlen) != 0) 826 continue; 827 828 break; 829 } 830 831 if (ifctx != NULL) { 832 s = bootpc_tag(&gctx->tmptag, 833 &gctx->reply, 834 gctx->replylen, 835 TAG_DHCP_MSGTYPE); 836 if (s != NULL) { 837 switch (*s) { 838 case DHCP_OFFER: 839 s = "DHCP Offer"; 840 break; 841 case DHCP_ACK: 842 s = "DHCP Ack"; 843 break; 844 default: 845 s = "DHCP (unexpected)"; 846 break; 847 } 848 } else 849 s = "BOOTP Reply"; 850 851 printf("Received %s packet" 852 " on %s from ", 853 s, 854 ifctx->ireq.ifr_name); 855 print_in_addr(gctx->reply.siaddr); 856 if (gctx->reply.giaddr.s_addr != 857 htonl(INADDR_ANY)) { 858 printf(" via "); 859 print_in_addr(gctx->reply.giaddr); 860 } 861 if (bootpc_received(gctx, ifctx) != 0) { 862 printf(" (accepted)"); 863 if (ifctx->outstanding) { 864 ifctx->outstanding = 0; 865 outstanding--; 866 } 867 /* Network settle delay */ 868 if (outstanding == 0) 869 atimo = time_second + 870 BOOTP_SETTLE_DELAY; 871 } else 872 printf(" (ignored)"); 873 if (ifctx->gotrootpath || 874 gctx->any_root_overrides) { 875 gotrootpath = 1; 876 rtimo = time_second + 877 BOOTP_SETTLE_DELAY; 878 if (ifctx->gotrootpath) 879 printf(" (got root path)"); 880 } 881 printf("\n"); 882 } 883 } /* while secs */ 884 #ifdef BOOTP_TIMEOUT 885 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0) 886 break; 887 #endif 888 /* Force a retry if halfway in DHCP negotiation */ 889 retry = 0; 890 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 891 if (ifctx->state == IF_DHCP_OFFERED) { 892 if (ifctx->dhcpquerytype == DHCP_DISCOVER) 893 retry = 1; 894 else 895 ifctx->state = IF_DHCP_UNRESOLVED; 896 } 897 898 if (retry != 0) 899 continue; 900 901 if (gotrootpath != 0) { 902 gctx->gotrootpath = gotrootpath; 903 if (rtimo != 0 && time_second >= rtimo) 904 break; 905 } 906 } /* forever send/receive */ 907 908 /* 909 * XXX: These are errors of varying seriousness being silently 910 * ignored 911 */ 912 913 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 914 if (bootpc_ifctx_isresolved(ifctx) == 0) { 915 printf("%s timeout for interface %s\n", 916 ifctx->dhcpquerytype != DHCP_NOMSG ? 917 "DHCP" : "BOOTP", 918 ifctx->ireq.ifr_name); 919 } 920 921 if (gctx->gotrootpath != 0) { 922 #if 0 923 printf("Got a root path, ignoring remaining timeout\n"); 924 #endif 925 error = 0; 926 goto out; 927 } 928 #ifndef BOOTP_NFSROOT 929 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 930 if (bootpc_ifctx_isresolved(ifctx) != 0) { 931 error = 0; 932 goto out; 933 } 934 #endif 935 error = ETIMEDOUT; 936 937 out: 938 return (error); 939 } 940 941 static void 942 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 943 { 944 struct ifreq *ifr; 945 struct in_aliasreq *ifra; 946 struct sockaddr_in *sin; 947 int error; 948 949 ifr = &ifctx->ireq; 950 ifra = &ifctx->iareq; 951 952 /* 953 * Bring up the interface. 954 * 955 * Get the old interface flags and or IFF_UP into them; if 956 * IFF_UP set blindly, interface selection can be clobbered. 957 */ 958 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 959 if (error != 0) 960 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 961 ifr->ifr_flags |= IFF_UP; 962 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 963 if (error != 0) 964 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 965 966 /* 967 * Do enough of ifconfig(8) so that the chosen interface 968 * can talk to the servers. Set address to 0.0.0.0/8 and 969 * broadcast address to local broadcast. 970 */ 971 sin = (struct sockaddr_in *)&ifra->ifra_addr; 972 clear_sinaddr(sin); 973 sin = (struct sockaddr_in *)&ifra->ifra_mask; 974 clear_sinaddr(sin); 975 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET); 976 sin = (struct sockaddr_in *)&ifra->ifra_broadaddr; 977 clear_sinaddr(sin); 978 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST); 979 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 980 if (error != 0) 981 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 982 } 983 984 static void 985 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 986 { 987 struct ifreq *ifr; 988 struct sockaddr_in *sin; 989 int error; 990 991 ifr = &ifctx->ireq; 992 993 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); 994 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 995 if (error != 0) 996 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 997 ifr->ifr_flags &= ~IFF_UP; 998 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 999 if (error != 0) 1000 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 1001 1002 sin = (struct sockaddr_in *) &ifr->ifr_addr; 1003 clear_sinaddr(sin); 1004 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 1005 if (error != 0) 1006 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 1007 } 1008 1009 static int 1010 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 1011 struct bootpc_globalcontext *gctx, struct thread *td) 1012 { 1013 int error; 1014 struct sockaddr_in defdst; 1015 struct sockaddr_in defmask; 1016 struct sockaddr_in *sin; 1017 struct ifreq *ifr; 1018 struct in_aliasreq *ifra; 1019 struct sockaddr_in *myaddr; 1020 struct sockaddr_in *netmask; 1021 struct sockaddr_in *gw; 1022 1023 ifr = &ifctx->ireq; 1024 ifra = &ifctx->iareq; 1025 myaddr = &ifctx->myaddr; 1026 netmask = &ifctx->netmask; 1027 gw = &ifctx->gw; 1028 1029 if (bootpc_ifctx_isresolved(ifctx) == 0) { 1030 /* Shutdown interfaces where BOOTP failed */ 1031 bootpc_shutdown_interface(ifctx, td); 1032 return (0); 1033 } 1034 1035 printf("Adjusted interface %s\n", ifctx->ireq.ifr_name); 1036 /* 1037 * Do enough of ifconfig(8) so that the chosen interface 1038 * can talk to the servers. (just set the address) 1039 */ 1040 sin = (struct sockaddr_in *) &ifr->ifr_addr; 1041 clear_sinaddr(sin); 1042 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 1043 if (error != 0) 1044 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 1045 1046 bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr)); 1047 bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask)); 1048 clear_sinaddr(&ifra->ifra_broadaddr); 1049 ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr | 1050 ~netmask->sin_addr.s_addr; 1051 1052 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 1053 if (error != 0) 1054 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 1055 1056 /* Add new default route */ 1057 1058 if (ifctx->gotgw != 0 || gctx->gotgw == 0) { 1059 clear_sinaddr(&defdst); 1060 clear_sinaddr(&defmask); 1061 /* XXX MRT just table 0 */ 1062 error = rtrequest_fib(RTM_ADD, 1063 (struct sockaddr *) &defdst, (struct sockaddr *) gw, 1064 (struct sockaddr *) &defmask, 1065 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB); 1066 if (error != 0) { 1067 printf("%s: RTM_ADD, error=%d\n", __func__, error); 1068 return (error); 1069 } 1070 } 1071 1072 return (0); 1073 } 1074 1075 static int 1076 setfs(struct sockaddr_in *addr, char *path, char *p, 1077 const struct in_addr *siaddr) 1078 { 1079 1080 if (getip(&p, &addr->sin_addr) == 0) { 1081 if (siaddr != NULL && *p == '/') 1082 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr)); 1083 else 1084 return 0; 1085 } else { 1086 if (*p != ':') 1087 return 0; 1088 p++; 1089 } 1090 1091 addr->sin_len = sizeof(struct sockaddr_in); 1092 addr->sin_family = AF_INET; 1093 1094 strlcpy(path, p, MNAMELEN); 1095 return 1; 1096 } 1097 1098 static int 1099 getip(char **ptr, struct in_addr *addr) 1100 { 1101 char *p; 1102 unsigned int ip; 1103 int val; 1104 1105 p = *ptr; 1106 ip = 0; 1107 if (((val = getdec(&p)) < 0) || (val > 255)) 1108 return 0; 1109 ip = val << 24; 1110 if (*p != '.') 1111 return 0; 1112 p++; 1113 if (((val = getdec(&p)) < 0) || (val > 255)) 1114 return 0; 1115 ip |= (val << 16); 1116 if (*p != '.') 1117 return 0; 1118 p++; 1119 if (((val = getdec(&p)) < 0) || (val > 255)) 1120 return 0; 1121 ip |= (val << 8); 1122 if (*p != '.') 1123 return 0; 1124 p++; 1125 if (((val = getdec(&p)) < 0) || (val > 255)) 1126 return 0; 1127 ip |= val; 1128 1129 addr->s_addr = htonl(ip); 1130 *ptr = p; 1131 return 1; 1132 } 1133 1134 static int 1135 getdec(char **ptr) 1136 { 1137 char *p; 1138 int ret; 1139 1140 p = *ptr; 1141 ret = 0; 1142 if ((*p < '0') || (*p > '9')) 1143 return -1; 1144 while ((*p >= '0') && (*p <= '9')) { 1145 ret = ret * 10 + (*p - '0'); 1146 p++; 1147 } 1148 *ptr = p; 1149 return ret; 1150 } 1151 1152 static void 1153 mountopts(struct nfs_args *args, char *p) 1154 { 1155 args->version = NFS_ARGSVERSION; 1156 args->rsize = BOOTP_BLOCKSIZE; 1157 args->wsize = BOOTP_BLOCKSIZE; 1158 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 1159 args->sotype = SOCK_DGRAM; 1160 if (p != NULL) 1161 nfs_parse_options(p, args); 1162 } 1163 1164 static int 1165 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 1166 { 1167 struct mbuf *m; 1168 int alignedlen; 1169 1170 m = *mptr; 1171 alignedlen = ( len + 3 ) & ~3; 1172 1173 if (m->m_len < alignedlen) { 1174 m = m_pullup(m, alignedlen); 1175 if (m == NULL) { 1176 *mptr = NULL; 1177 return EBADRPC; 1178 } 1179 } 1180 bcopy(mtod(m, u_char *), buf, len); 1181 m_adj(m, alignedlen); 1182 *mptr = m; 1183 return 0; 1184 } 1185 1186 static int 1187 xdr_int_decode(struct mbuf **mptr, int *iptr) 1188 { 1189 u_int32_t i; 1190 1191 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 1192 return EBADRPC; 1193 *iptr = fxdr_unsigned(u_int32_t, i); 1194 return 0; 1195 } 1196 1197 static void 1198 print_sin_addr(struct sockaddr_in *sin) 1199 { 1200 1201 print_in_addr(sin->sin_addr); 1202 } 1203 1204 static void 1205 print_in_addr(struct in_addr addr) 1206 { 1207 unsigned int ip; 1208 1209 ip = ntohl(addr.s_addr); 1210 printf("%d.%d.%d.%d", 1211 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); 1212 } 1213 1214 static void 1215 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td) 1216 { 1217 unsigned char *vendp; 1218 unsigned char vendor_client[64]; 1219 uint32_t leasetime; 1220 uint8_t vendor_client_len; 1221 1222 ifctx->gotrootpath = 0; 1223 1224 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call)); 1225 1226 /* bootpc part */ 1227 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */ 1228 ifctx->call.htype = 1; /* 10mb ethernet */ 1229 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */ 1230 ifctx->call.hops = 0; 1231 if (bootpc_ifctx_isunresolved(ifctx) != 0) 1232 ifctx->xid++; 1233 ifctx->call.xid = txdr_unsigned(ifctx->xid); 1234 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); 1235 1236 vendp = ifctx->call.vend; 1237 *vendp++ = 99; /* RFC1048 cookie */ 1238 *vendp++ = 130; 1239 *vendp++ = 83; 1240 *vendp++ = 99; 1241 *vendp++ = TAG_MAXMSGSIZE; 1242 *vendp++ = 2; 1243 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; 1244 *vendp++ = sizeof(struct bootp_packet) & 255; 1245 1246 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", 1247 ostype, MACHINE, osrelease); 1248 vendor_client_len = strlen(vendor_client); 1249 *vendp++ = TAG_VENDOR_INDENTIFIER; 1250 *vendp++ = vendor_client_len; 1251 memcpy(vendp, vendor_client, vendor_client_len); 1252 vendp += vendor_client_len; 1253 ifctx->dhcpquerytype = DHCP_NOMSG; 1254 switch (ifctx->state) { 1255 case IF_DHCP_UNRESOLVED: 1256 *vendp++ = TAG_DHCP_MSGTYPE; 1257 *vendp++ = 1; 1258 *vendp++ = DHCP_DISCOVER; 1259 ifctx->dhcpquerytype = DHCP_DISCOVER; 1260 ifctx->gotdhcpserver = 0; 1261 break; 1262 case IF_DHCP_OFFERED: 1263 *vendp++ = TAG_DHCP_MSGTYPE; 1264 *vendp++ = 1; 1265 *vendp++ = DHCP_REQUEST; 1266 ifctx->dhcpquerytype = DHCP_REQUEST; 1267 *vendp++ = TAG_DHCP_REQ_ADDR; 1268 *vendp++ = 4; 1269 memcpy(vendp, &ifctx->reply.yiaddr, 4); 1270 vendp += 4; 1271 if (ifctx->gotdhcpserver != 0) { 1272 *vendp++ = TAG_DHCP_SERVERID; 1273 *vendp++ = 4; 1274 memcpy(vendp, &ifctx->dhcpserver, 4); 1275 vendp += 4; 1276 } 1277 *vendp++ = TAG_DHCP_LEASETIME; 1278 *vendp++ = 4; 1279 leasetime = htonl(300); 1280 memcpy(vendp, &leasetime, 4); 1281 vendp += 4; 1282 break; 1283 default: 1284 break; 1285 } 1286 *vendp = TAG_END; 1287 1288 ifctx->call.secs = 0; 1289 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */ 1290 } 1291 1292 static int 1293 bootpc_hascookie(struct bootp_packet *bp) 1294 { 1295 1296 return (bp->vend[0] == 99 && bp->vend[1] == 130 && 1297 bp->vend[2] == 83 && bp->vend[3] == 99); 1298 } 1299 1300 static void 1301 bootpc_tag_helper(struct bootpc_tagcontext *tctx, 1302 unsigned char *start, int len, int tag) 1303 { 1304 unsigned char *j; 1305 unsigned char *ej; 1306 unsigned char code; 1307 1308 if (tctx->badtag != 0 || tctx->badopt != 0) 1309 return; 1310 1311 j = start; 1312 ej = j + len; 1313 1314 while (j < ej) { 1315 code = *j++; 1316 if (code == TAG_PAD) 1317 continue; 1318 if (code == TAG_END) 1319 return; 1320 if (j >= ej || j + *j + 1 > ej) { 1321 tctx->badopt = 1; 1322 return; 1323 } 1324 len = *j++; 1325 if (code == tag) { 1326 if (tctx->taglen + len > TAG_MAXLEN) { 1327 tctx->badtag = 1; 1328 return; 1329 } 1330 tctx->foundopt = 1; 1331 if (len > 0) 1332 memcpy(tctx->buf + tctx->taglen, 1333 j, len); 1334 tctx->taglen += len; 1335 } 1336 if (code == TAG_OVERLOAD) 1337 tctx->overload = *j; 1338 1339 j += len; 1340 } 1341 } 1342 1343 static unsigned char * 1344 bootpc_tag(struct bootpc_tagcontext *tctx, 1345 struct bootp_packet *bp, int len, int tag) 1346 { 1347 tctx->overload = 0; 1348 tctx->badopt = 0; 1349 tctx->badtag = 0; 1350 tctx->foundopt = 0; 1351 tctx->taglen = 0; 1352 1353 if (bootpc_hascookie(bp) == 0) 1354 return NULL; 1355 1356 bootpc_tag_helper(tctx, &bp->vend[4], 1357 (unsigned char *) bp + len - &bp->vend[4], tag); 1358 1359 if ((tctx->overload & OVERLOAD_FILE) != 0) 1360 bootpc_tag_helper(tctx, 1361 (unsigned char *) bp->file, 1362 sizeof(bp->file), 1363 tag); 1364 if ((tctx->overload & OVERLOAD_SNAME) != 0) 1365 bootpc_tag_helper(tctx, 1366 (unsigned char *) bp->sname, 1367 sizeof(bp->sname), 1368 tag); 1369 1370 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0) 1371 return NULL; 1372 tctx->buf[tctx->taglen] = '\0'; 1373 return tctx->buf; 1374 } 1375 1376 static void 1377 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx, 1378 struct bootpc_globalcontext *gctx) 1379 { 1380 char *p, *s; 1381 unsigned int ip; 1382 1383 ifctx->gotgw = 0; 1384 ifctx->gotnetmask = 0; 1385 1386 clear_sinaddr(&ifctx->myaddr); 1387 clear_sinaddr(&ifctx->netmask); 1388 clear_sinaddr(&ifctx->gw); 1389 1390 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1391 1392 ip = ntohl(ifctx->myaddr.sin_addr.s_addr); 1393 1394 printf("%s at ", ifctx->ireq.ifr_name); 1395 print_sin_addr(&ifctx->myaddr); 1396 printf(" server "); 1397 print_in_addr(ifctx->reply.siaddr); 1398 1399 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1400 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1401 printf(" via gateway "); 1402 print_in_addr(ifctx->reply.giaddr); 1403 } 1404 1405 /* This call used for the side effect (overload flag) */ 1406 (void) bootpc_tag(&gctx->tmptag, 1407 &ifctx->reply, ifctx->replylen, TAG_END); 1408 1409 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1410 if (ifctx->reply.sname[0] != '\0') 1411 printf(" server name %s", ifctx->reply.sname); 1412 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1413 if (ifctx->reply.file[0] != '\0') 1414 printf(" boot file %s", ifctx->reply.file); 1415 1416 printf("\n"); 1417 1418 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1419 TAG_SUBNETMASK); 1420 if (p != NULL) { 1421 if (gctx->tag.taglen != 4) 1422 panic("bootpc: subnet mask len is %d", 1423 gctx->tag.taglen); 1424 bcopy(p, &ifctx->netmask.sin_addr, 4); 1425 ifctx->gotnetmask = 1; 1426 printf("subnet mask "); 1427 print_sin_addr(&ifctx->netmask); 1428 printf(" "); 1429 } 1430 1431 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1432 TAG_ROUTERS); 1433 if (p != NULL) { 1434 /* Routers */ 1435 if (gctx->tag.taglen % 4) 1436 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1437 if (gctx->tag.taglen > 0) { 1438 bcopy(p, &ifctx->gw.sin_addr, 4); 1439 printf("router "); 1440 print_sin_addr(&ifctx->gw); 1441 printf(" "); 1442 ifctx->gotgw = 1; 1443 gctx->gotgw = 1; 1444 } 1445 } 1446 1447 /* 1448 * Choose a root filesystem. If a value is forced in the environment 1449 * and it contains "nfs:", use it unconditionally. Otherwise, if the 1450 * kernel is compiled with the ROOTDEVNAME option, then use it if: 1451 * - The server doesn't provide a pathname. 1452 * - The boothowto flags include RB_DFLTROOT (user said to override 1453 * the server value). 1454 */ 1455 p = NULL; 1456 if ((s = getenv("vfs.root.mountfrom")) != NULL) { 1457 if ((p = strstr(s, "nfs:")) != NULL) 1458 p = strdup(p + 4, M_TEMP); 1459 freeenv(s); 1460 } 1461 if (p == NULL) { 1462 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1463 TAG_ROOT); 1464 } 1465 #ifdef ROOTDEVNAME 1466 if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) && 1467 (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) { 1468 p += 4; 1469 } 1470 #endif 1471 if (p != NULL) { 1472 if (gctx->setrootfs != NULL) { 1473 printf("rootfs %s (ignored) ", p); 1474 } else if (setfs(&nd->root_saddr, 1475 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1476 if (*p == '/') { 1477 printf("root_server "); 1478 print_sin_addr(&nd->root_saddr); 1479 printf(" "); 1480 } 1481 printf("rootfs %s ", p); 1482 gctx->gotrootpath = 1; 1483 ifctx->gotrootpath = 1; 1484 gctx->setrootfs = ifctx; 1485 1486 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1487 ifctx->replylen, 1488 TAG_ROOTOPTS); 1489 if (p != NULL) { 1490 mountopts(&nd->root_args, p); 1491 printf("rootopts %s ", p); 1492 } 1493 } else 1494 panic("Failed to set rootfs to %s", p); 1495 } 1496 1497 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1498 TAG_HOSTNAME); 1499 if (p != NULL) { 1500 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1501 panic("bootpc: hostname >= %d bytes", 1502 MAXHOSTNAMELEN); 1503 if (gctx->sethostname != NULL) { 1504 printf("hostname %s (ignored) ", p); 1505 } else { 1506 strcpy(nd->my_hostnam, p); 1507 mtx_lock(&prison0.pr_mtx); 1508 strcpy(prison0.pr_hostname, p); 1509 mtx_unlock(&prison0.pr_mtx); 1510 printf("hostname %s ", p); 1511 gctx->sethostname = ifctx; 1512 } 1513 } 1514 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1515 TAG_COOKIE); 1516 if (p != NULL) { /* store in a sysctl variable */ 1517 int i, l = sizeof(bootp_cookie) - 1; 1518 for (i = 0; i < l && p[i] != '\0'; i++) 1519 bootp_cookie[i] = p[i]; 1520 p[i] = '\0'; 1521 } 1522 1523 1524 printf("\n"); 1525 1526 if (ifctx->gotnetmask == 0) { 1527 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1528 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1529 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1530 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1531 else 1532 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1533 } 1534 if (ifctx->gotgw == 0) { 1535 /* Use proxyarp */ 1536 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr; 1537 } 1538 } 1539 1540 void 1541 bootpc_init(void) 1542 { 1543 struct bootpc_ifcontext *ifctx; /* Interface BOOTP contexts */ 1544 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1545 struct ifnet *ifp; 1546 struct sockaddr_dl *sdl; 1547 struct ifaddr *ifa; 1548 int error; 1549 #ifndef BOOTP_WIRED_TO 1550 int ifcnt; 1551 #endif 1552 struct nfsv3_diskless *nd; 1553 struct thread *td; 1554 int timeout; 1555 int delay; 1556 1557 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz; 1558 delay = hz / 10; 1559 1560 nd = &nfsv3_diskless; 1561 td = curthread; 1562 1563 /* 1564 * If already filled in, don't touch it here 1565 */ 1566 if (nfs_diskless_valid != 0) 1567 return; 1568 1569 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1570 STAILQ_INIT(&gctx->interfaces); 1571 gctx->xid = ~0xFFFF; 1572 gctx->starttime = time_second; 1573 1574 /* 1575 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have 1576 * root-path overrides that can potentially let us boot even if we don't 1577 * get a root path from the server, so we can treat that as a non-error. 1578 */ 1579 #ifdef ROOTDEVNAME 1580 gctx->any_root_overrides = 1; 1581 #else 1582 gctx->any_root_overrides = testenv("vfs.root.mountfrom"); 1583 #endif 1584 1585 /* 1586 * Find a network interface. 1587 */ 1588 CURVNET_SET(TD_TO_VNET(td)); 1589 #ifdef BOOTP_WIRED_TO 1590 printf("%s: wired to interface '%s'\n", __func__, 1591 __XSTRING(BOOTP_WIRED_TO)); 1592 allocifctx(gctx); 1593 #else 1594 /* 1595 * Preallocate interface context storage, if another interface 1596 * attaches and wins the race, it won't be eligible for bootp. 1597 */ 1598 ifcnt = 0; 1599 IFNET_RLOCK(); 1600 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1601 if ((ifp->if_flags & 1602 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1603 IFF_BROADCAST) 1604 continue; 1605 switch (ifp->if_alloctype) { 1606 case IFT_ETHER: 1607 case IFT_FDDI: 1608 case IFT_ISO88025: 1609 break; 1610 default: 1611 continue; 1612 } 1613 ifcnt++; 1614 } 1615 IFNET_RUNLOCK(); 1616 if (ifcnt == 0) 1617 panic("%s: no eligible interfaces", __func__); 1618 for (; ifcnt > 0; ifcnt--) 1619 allocifctx(gctx); 1620 #endif 1621 1622 retry: 1623 ifctx = STAILQ_FIRST(&gctx->interfaces); 1624 IFNET_RLOCK(); 1625 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1626 if (ifctx == NULL) 1627 break; 1628 #ifdef BOOTP_WIRED_TO 1629 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0) 1630 continue; 1631 #else 1632 if ((ifp->if_flags & 1633 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1634 IFF_BROADCAST) 1635 continue; 1636 switch (ifp->if_alloctype) { 1637 case IFT_ETHER: 1638 case IFT_FDDI: 1639 case IFT_ISO88025: 1640 break; 1641 default: 1642 continue; 1643 } 1644 #endif 1645 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1646 sizeof(ifctx->ireq.ifr_name)); 1647 ifctx->ifp = ifp; 1648 1649 /* Get HW address */ 1650 sdl = NULL; 1651 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1652 if (ifa->ifa_addr->sa_family == AF_LINK) { 1653 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1654 if (sdl->sdl_type == IFT_ETHER) 1655 break; 1656 } 1657 if (sdl == NULL) 1658 panic("bootpc: Unable to find HW address for %s", 1659 ifctx->ireq.ifr_name); 1660 ifctx->sdl = sdl; 1661 1662 ifctx = STAILQ_NEXT(ifctx, next); 1663 } 1664 IFNET_RUNLOCK(); 1665 CURVNET_RESTORE(); 1666 1667 if (STAILQ_EMPTY(&gctx->interfaces) || 1668 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) { 1669 if (timeout > 0) { 1670 pause("bootpc", delay); 1671 timeout -= delay; 1672 goto retry; 1673 } 1674 #ifdef BOOTP_WIRED_TO 1675 panic("%s: Could not find interface specified " 1676 "by BOOTP_WIRED_TO: " 1677 __XSTRING(BOOTP_WIRED_TO), __func__); 1678 #else 1679 panic("%s: no suitable interface", __func__); 1680 #endif 1681 } 1682 1683 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td); 1684 if (error != 0) 1685 panic("%s: socreate, error=%d", __func__, error); 1686 1687 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1688 bootpc_fakeup_interface(ifctx, td); 1689 1690 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1691 bootpc_compose_query(ifctx, td); 1692 1693 error = bootpc_call(gctx, td); 1694 if (error != 0) { 1695 printf("BOOTP call failed\n"); 1696 } 1697 1698 mountopts(&nd->root_args, NULL); 1699 1700 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1701 if (bootpc_ifctx_isresolved(ifctx) != 0) 1702 bootpc_decode_reply(nd, ifctx, gctx); 1703 1704 #ifdef BOOTP_NFSROOT 1705 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0) 1706 panic("bootpc: No root path offered"); 1707 #endif 1708 1709 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1710 bootpc_adjust_interface(ifctx, gctx, td); 1711 1712 soclose(bootp_so); 1713 1714 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1715 if (ifctx->gotrootpath != 0) 1716 break; 1717 if (ifctx == NULL) { 1718 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1719 if (bootpc_ifctx_isresolved(ifctx) != 0) 1720 break; 1721 } 1722 if (ifctx == NULL) 1723 goto out; 1724 1725 if (gctx->gotrootpath != 0) { 1726 1727 setenv("boot.netif.name", ifctx->ifp->if_xname); 1728 1729 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1730 nd->root_fh, &nd->root_fhsize, 1731 &nd->root_args, td); 1732 if (error != 0) { 1733 if (gctx->any_root_overrides == 0) 1734 panic("nfs_boot: mount root, error=%d", error); 1735 else 1736 goto out; 1737 } 1738 rootdevnames[0] = "nfs:"; 1739 #ifdef NFSCLIENT 1740 rootdevnames[1] = "oldnfs:"; 1741 #endif 1742 nfs_diskless_valid = 3; 1743 } 1744 1745 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1746 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1747 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1748 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1749 ifctx->myaddr.sin_addr.s_addr | 1750 ~ ifctx->netmask.sin_addr.s_addr; 1751 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1752 1753 out: 1754 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) { 1755 STAILQ_REMOVE_HEAD(&gctx->interfaces, next); 1756 free(ifctx, M_TEMP); 1757 } 1758 free(gctx, M_TEMP); 1759 } 1760 1761 /* 1762 * RPC: mountd/mount 1763 * Given a server pathname, get an NFS file handle. 1764 * Also, sets sin->sin_port to the NFS service port. 1765 */ 1766 static int 1767 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1768 struct nfs_args *args, struct thread *td) 1769 { 1770 struct mbuf *m; 1771 int error; 1772 int authunixok; 1773 int authcount; 1774 int authver; 1775 1776 #define RPCPROG_MNT 100005 1777 #define RPCMNT_VER1 1 1778 #define RPCMNT_VER3 3 1779 #define RPCMNT_MOUNT 1 1780 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1781 #define AUTH_UNIX AUTH_SYS 1782 1783 /* XXX honor v2/v3 flags in args->flags? */ 1784 #ifdef BOOTP_NFSV3 1785 /* First try NFS v3 */ 1786 /* Get port number for MOUNTD. */ 1787 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1788 &mdsin->sin_port, td); 1789 if (error == 0) { 1790 m = xdr_string_encode(path, strlen(path)); 1791 1792 /* Do RPC to mountd. */ 1793 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1794 RPCMNT_MOUNT, &m, NULL, td); 1795 } 1796 if (error == 0) { 1797 args->flags |= NFSMNT_NFSV3; 1798 } else { 1799 #endif 1800 /* Fallback to NFS v2 */ 1801 1802 /* Get port number for MOUNTD. */ 1803 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1804 &mdsin->sin_port, td); 1805 if (error != 0) 1806 return error; 1807 1808 m = xdr_string_encode(path, strlen(path)); 1809 1810 /* Do RPC to mountd. */ 1811 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1812 RPCMNT_MOUNT, &m, NULL, td); 1813 if (error != 0) 1814 return error; /* message already freed */ 1815 1816 #ifdef BOOTP_NFSV3 1817 } 1818 #endif 1819 1820 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1821 goto bad; 1822 1823 if ((args->flags & NFSMNT_NFSV3) != 0) { 1824 if (xdr_int_decode(&m, fhsizep) != 0 || 1825 *fhsizep > NFSX_V3FHMAX || 1826 *fhsizep <= 0) 1827 goto bad; 1828 } else 1829 *fhsizep = NFSX_V2FH; 1830 1831 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1832 goto bad; 1833 1834 if (args->flags & NFSMNT_NFSV3) { 1835 if (xdr_int_decode(&m, &authcount) != 0) 1836 goto bad; 1837 authunixok = 0; 1838 if (authcount < 0 || authcount > 100) 1839 goto bad; 1840 while (authcount > 0) { 1841 if (xdr_int_decode(&m, &authver) != 0) 1842 goto bad; 1843 if (authver == AUTH_UNIX) 1844 authunixok = 1; 1845 authcount--; 1846 } 1847 if (authunixok == 0) 1848 goto bad; 1849 } 1850 1851 /* Set port number for NFS use. */ 1852 error = krpc_portmap(mdsin, NFS_PROG, 1853 (args->flags & 1854 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1855 &mdsin->sin_port, td); 1856 1857 goto out; 1858 1859 bad: 1860 error = EBADRPC; 1861 1862 out: 1863 m_freem(m); 1864 return error; 1865 } 1866 1867 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL); 1868
Indexes created Tue Sep 30 20:09:53 GMT 2025