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 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 Gordon Ross, Adam Glass 5 * Copyright (c) 1992 Regents of the University of California. 6 * All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Lawrence Berkeley Laboratory and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * based on: 41 * nfs/krpc_subr.c 42 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $ 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD: releng/12.0/sys/nfs/bootp_subr.c 335250 2018-06-16 08:26:23Z ae $"); 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/endian.h> 55 #include <sys/jail.h> 56 #include <sys/kernel.h> 57 #include <sys/sockio.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/mbuf.h> 61 #include <sys/proc.h> 62 #include <sys/reboot.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sysctl.h> 66 #include <sys/uio.h> 67 68 #include <net/if.h> 69 #include <net/if_var.h> 70 #include <net/route.h> 71 #ifdef BOOTP_DEBUG 72 #include <net/route_var.h> 73 #endif 74 75 #include <netinet/in.h> 76 #include <netinet/in_var.h> 77 #include <net/if_types.h> 78 #include <net/if_dl.h> 79 #include <net/vnet.h> 80 81 #include <nfs/nfsproto.h> 82 #include <nfsclient/nfs.h> 83 #include <nfs/nfsdiskless.h> 84 #include <nfs/krpc.h> 85 #include <nfs/xdr_subs.h> 86 87 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */ 88 89 #ifndef BOOTP_SETTLE_DELAY 90 #define BOOTP_SETTLE_DELAY 3 91 #endif 92 93 /* 94 * Wait 10 seconds for interface appearance 95 * USB ethernet adapters might require some time to pop up 96 */ 97 #ifndef BOOTP_IFACE_WAIT_TIMEOUT 98 #define BOOTP_IFACE_WAIT_TIMEOUT 10 99 #endif 100 101 /* 102 * What is the longest we will wait before re-sending a request? 103 * Note this is also the frequency of "RPC timeout" messages. 104 * The re-send loop count sup linearly to this maximum, so the 105 * first complaint will happen after (1+2+3+4+5)=15 seconds. 106 */ 107 #define MAX_RESEND_DELAY 5 /* seconds */ 108 109 /* Definitions from RFC951 */ 110 struct bootp_packet { 111 u_int8_t op; 112 u_int8_t htype; 113 u_int8_t hlen; 114 u_int8_t hops; 115 u_int32_t xid; 116 u_int16_t secs; 117 u_int16_t flags; 118 struct in_addr ciaddr; 119 struct in_addr yiaddr; 120 struct in_addr siaddr; 121 struct in_addr giaddr; 122 unsigned char chaddr[16]; 123 char sname[64]; 124 char file[128]; 125 unsigned char vend[1222]; 126 }; 127 128 struct bootpc_ifcontext { 129 STAILQ_ENTRY(bootpc_ifcontext) next; 130 struct bootp_packet call; 131 struct bootp_packet reply; 132 int replylen; 133 int overload; 134 union { 135 struct ifreq _ifreq; 136 struct in_aliasreq _in_alias_req; 137 } _req; 138 #define ireq _req._ifreq 139 #define iareq _req._in_alias_req 140 struct ifnet *ifp; 141 struct sockaddr_dl *sdl; 142 struct sockaddr_in myaddr; 143 struct sockaddr_in netmask; 144 struct sockaddr_in gw; 145 int gotgw; 146 int gotnetmask; 147 int gotrootpath; 148 int outstanding; 149 int sentmsg; 150 u_int32_t xid; 151 enum { 152 IF_BOOTP_UNRESOLVED, 153 IF_BOOTP_RESOLVED, 154 IF_BOOTP_FAILED, 155 IF_DHCP_UNRESOLVED, 156 IF_DHCP_OFFERED, 157 IF_DHCP_RESOLVED, 158 IF_DHCP_FAILED, 159 } state; 160 int dhcpquerytype; /* dhcp type sent */ 161 struct in_addr dhcpserver; 162 int gotdhcpserver; 163 uint16_t mtu; 164 }; 165 166 #define TAG_MAXLEN 1024 167 struct bootpc_tagcontext { 168 char buf[TAG_MAXLEN + 1]; 169 int overload; 170 int badopt; 171 int badtag; 172 int foundopt; 173 int taglen; 174 }; 175 176 struct bootpc_globalcontext { 177 STAILQ_HEAD(, bootpc_ifcontext) interfaces; 178 u_int32_t xid; 179 int any_root_overrides; 180 int gotrootpath; 181 int gotgw; 182 int ifnum; 183 int secs; 184 int starttime; 185 struct bootp_packet reply; 186 int replylen; 187 struct bootpc_ifcontext *setrootfs; 188 struct bootpc_ifcontext *sethostname; 189 struct bootpc_tagcontext tmptag; 190 struct bootpc_tagcontext tag; 191 }; 192 193 #define IPPORT_BOOTPC 68 194 #define IPPORT_BOOTPS 67 195 196 #define BOOTP_REQUEST 1 197 #define BOOTP_REPLY 2 198 199 /* Common tags */ 200 #define TAG_PAD 0 /* Pad option, implicit length 1 */ 201 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */ 202 #define TAG_ROUTERS 3 /* Routers (in order of preference) */ 203 #define TAG_HOSTNAME 12 /* Client host name */ 204 #define TAG_ROOT 17 /* Root path */ 205 #define TAG_INTF_MTU 26 /* Interface MTU Size (RFC2132) */ 206 207 /* DHCP specific tags */ 208 #define TAG_OVERLOAD 52 /* Option Overload */ 209 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */ 210 211 #define TAG_END 255 /* End Option (i.e. no more options) */ 212 213 /* Overload values */ 214 #define OVERLOAD_FILE 1 215 #define OVERLOAD_SNAME 2 216 217 /* Site specific tags: */ 218 #define TAG_ROOTOPTS 130 219 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */ 220 221 #define TAG_DHCP_MSGTYPE 53 222 #define TAG_DHCP_REQ_ADDR 50 223 #define TAG_DHCP_SERVERID 54 224 #define TAG_DHCP_LEASETIME 51 225 226 #define TAG_VENDOR_INDENTIFIER 60 227 228 #define DHCP_NOMSG 0 229 #define DHCP_DISCOVER 1 230 #define DHCP_OFFER 2 231 #define DHCP_REQUEST 3 232 #define DHCP_ACK 5 233 234 /* NFS read/write block size */ 235 #ifndef BOOTP_BLOCKSIZE 236 #define BOOTP_BLOCKSIZE 8192 237 #endif 238 239 static char bootp_cookie[128]; 240 static struct socket *bootp_so; 241 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, 242 bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); 243 244 /* mountd RPC */ 245 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, 246 int *fhsizep, struct nfs_args *args, struct thread *td); 247 static int setfs(struct sockaddr_in *addr, char *path, char *p, 248 const struct in_addr *siaddr); 249 static int getdec(char **ptr); 250 static int getip(char **ptr, struct in_addr *ip); 251 static void mountopts(struct nfs_args *args, char *p); 252 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 253 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 254 static void print_in_addr(struct in_addr addr); 255 static void print_sin_addr(struct sockaddr_in *addr); 256 static void clear_sinaddr(struct sockaddr_in *sin); 257 static void allocifctx(struct bootpc_globalcontext *gctx); 258 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx, 259 struct thread *td); 260 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx, 261 struct bootp_packet *bp, int len, int tag); 262 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx, 263 unsigned char *start, int len, int tag); 264 265 #ifdef BOOTP_DEBUG 266 void bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma); 267 void bootpboot_p_rtentry(struct rtentry *rt); 268 void bootpboot_p_tree(struct radix_node *rn); 269 void bootpboot_p_rtlist(void); 270 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa); 271 void bootpboot_p_iflist(void); 272 #endif 273 274 static int bootpc_call(struct bootpc_globalcontext *gctx, 275 struct thread *td); 276 277 static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 278 struct thread *td); 279 280 static void bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 281 struct bootpc_globalcontext *gctx, struct thread *td); 282 283 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 284 struct bootpc_ifcontext *ifctx, 285 struct bootpc_globalcontext *gctx); 286 287 static int bootpc_received(struct bootpc_globalcontext *gctx, 288 struct bootpc_ifcontext *ifctx); 289 290 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 291 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 292 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 293 294 /* 295 * In order to have multiple active interfaces with address 0.0.0.0 296 * and be able to send data to a selected interface, we first set 297 * mask to /8 on all interfaces, and temporarily set it to /0 when 298 * doing sosend(). 299 */ 300 301 #ifdef BOOTP_DEBUG 302 void 303 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma) 304 { 305 306 if (sa == NULL) { 307 printf("(sockaddr *) <null>"); 308 return; 309 } 310 switch (sa->sa_family) { 311 case AF_INET: 312 { 313 struct sockaddr_in *sin; 314 315 sin = (struct sockaddr_in *) sa; 316 printf("inet "); 317 print_sin_addr(sin); 318 if (ma != NULL) { 319 sin = (struct sockaddr_in *) ma; 320 printf(" mask "); 321 print_sin_addr(sin); 322 } 323 } 324 break; 325 case AF_LINK: 326 { 327 struct sockaddr_dl *sli; 328 int i; 329 330 sli = (struct sockaddr_dl *) sa; 331 printf("link %.*s ", sli->sdl_nlen, sli->sdl_data); 332 for (i = 0; i < sli->sdl_alen; i++) { 333 if (i > 0) 334 printf(":"); 335 printf("%x", ((unsigned char *) LLADDR(sli))[i]); 336 } 337 } 338 break; 339 default: 340 printf("af%d", sa->sa_family); 341 } 342 } 343 344 void 345 bootpboot_p_rtentry(struct rtentry *rt) 346 { 347 348 bootpboot_p_sa(rt_key(rt), rt_mask(rt)); 349 printf(" "); 350 bootpboot_p_sa(rt->rt_gateway, NULL); 351 printf(" "); 352 printf("flags %x", (unsigned short) rt->rt_flags); 353 printf(" %d", (int) rt->rt_expire); 354 printf(" %s\n", rt->rt_ifp->if_xname); 355 } 356 357 void 358 bootpboot_p_tree(struct radix_node *rn) 359 { 360 361 while (rn != NULL) { 362 if (rn->rn_bit < 0) { 363 if ((rn->rn_flags & RNF_ROOT) != 0) { 364 } else { 365 bootpboot_p_rtentry((struct rtentry *) rn); 366 } 367 rn = rn->rn_dupedkey; 368 } else { 369 bootpboot_p_tree(rn->rn_left); 370 bootpboot_p_tree(rn->rn_right); 371 return; 372 } 373 } 374 } 375 376 void 377 bootpboot_p_rtlist(void) 378 { 379 RIB_RLOCK_TRACKER; 380 struct rib_head *rnh; 381 382 printf("Routing table:\n"); 383 rnh = rt_tables_get_rnh(0, AF_INET); 384 if (rnh == NULL) 385 return; 386 RIB_RLOCK(rnh); /* could sleep XXX */ 387 bootpboot_p_tree(rnh->rnh_treetop); 388 RIB_RUNLOCK(rnh); 389 } 390 391 void 392 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 393 { 394 395 printf("%s flags %x, addr ", 396 ifp->if_xname, ifp->if_flags); 397 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 398 printf(", broadcast "); 399 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 400 printf(", netmask "); 401 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 402 printf("\n"); 403 } 404 405 void 406 bootpboot_p_iflist(void) 407 { 408 struct ifnet *ifp; 409 struct ifaddr *ifa; 410 411 printf("Interface list:\n"); 412 IFNET_RLOCK(); 413 for (ifp = CK_STAILQ_FIRST(&V_ifnet); 414 ifp != NULL; 415 ifp = CK_STAILQ_NEXT(ifp, if_link)) { 416 for (ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 417 ifa != NULL; 418 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) 419 if (ifa->ifa_addr->sa_family == AF_INET) 420 bootpboot_p_if(ifp, ifa); 421 } 422 IFNET_RUNLOCK(); 423 } 424 #endif /* defined(BOOTP_DEBUG) */ 425 426 static void 427 clear_sinaddr(struct sockaddr_in *sin) 428 { 429 430 bzero(sin, sizeof(*sin)); 431 sin->sin_len = sizeof(*sin); 432 sin->sin_family = AF_INET; 433 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 434 sin->sin_port = 0; 435 } 436 437 static void 438 allocifctx(struct bootpc_globalcontext *gctx) 439 { 440 struct bootpc_ifcontext *ifctx; 441 442 ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO); 443 ifctx->xid = gctx->xid; 444 #ifdef BOOTP_NO_DHCP 445 ifctx->state = IF_BOOTP_UNRESOLVED; 446 #else 447 ifctx->state = IF_DHCP_UNRESOLVED; 448 #endif 449 gctx->xid += 0x100; 450 STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next); 451 } 452 453 static __inline int 454 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 455 { 456 457 if (ifctx->state == IF_BOOTP_RESOLVED || 458 ifctx->state == IF_DHCP_RESOLVED) 459 return 1; 460 return 0; 461 } 462 463 static __inline int 464 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 465 { 466 467 if (ifctx->state == IF_BOOTP_UNRESOLVED || 468 ifctx->state == IF_DHCP_UNRESOLVED) 469 return 1; 470 return 0; 471 } 472 473 static __inline int 474 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 475 { 476 477 if (ifctx->state == IF_BOOTP_FAILED || 478 ifctx->state == IF_DHCP_FAILED) 479 return 1; 480 return 0; 481 } 482 483 static int 484 bootpc_received(struct bootpc_globalcontext *gctx, 485 struct bootpc_ifcontext *ifctx) 486 { 487 unsigned char dhcpreplytype; 488 char *p; 489 490 /* 491 * Need timeout for fallback to less 492 * desirable alternative. 493 */ 494 495 /* This call used for the side effect (badopt flag) */ 496 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 497 gctx->replylen, 498 TAG_END); 499 500 /* If packet is invalid, ignore it */ 501 if (gctx->tmptag.badopt != 0) 502 return 0; 503 504 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 505 gctx->replylen, TAG_DHCP_MSGTYPE); 506 if (p != NULL) 507 dhcpreplytype = *p; 508 else 509 dhcpreplytype = DHCP_NOMSG; 510 511 switch (ifctx->dhcpquerytype) { 512 case DHCP_DISCOVER: 513 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 514 #ifndef BOOTP_FORCE_DHCP 515 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 516 #endif 517 ) 518 return 0; 519 break; 520 case DHCP_REQUEST: 521 if (dhcpreplytype != DHCP_ACK) 522 return 0; 523 case DHCP_NOMSG: 524 break; 525 } 526 527 /* Ignore packet unless it gives us a root tag we didn't have */ 528 529 if ((ifctx->state == IF_BOOTP_RESOLVED || 530 (ifctx->dhcpquerytype == DHCP_DISCOVER && 531 (ifctx->state == IF_DHCP_OFFERED || 532 ifctx->state == IF_DHCP_RESOLVED))) && 533 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 534 ifctx->replylen, 535 TAG_ROOT) != NULL || 536 bootpc_tag(&gctx->tmptag, &gctx->reply, 537 gctx->replylen, 538 TAG_ROOT) == NULL)) 539 return 0; 540 541 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 542 ifctx->replylen = gctx->replylen; 543 544 /* XXX: Only reset if 'perfect' response */ 545 if (ifctx->state == IF_BOOTP_UNRESOLVED) 546 ifctx->state = IF_BOOTP_RESOLVED; 547 else if (ifctx->state == IF_DHCP_UNRESOLVED && 548 ifctx->dhcpquerytype == DHCP_DISCOVER) { 549 if (dhcpreplytype == DHCP_OFFER) 550 ifctx->state = IF_DHCP_OFFERED; 551 else 552 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 553 } else if (ifctx->state == IF_DHCP_OFFERED && 554 ifctx->dhcpquerytype == DHCP_REQUEST) 555 ifctx->state = IF_DHCP_RESOLVED; 556 557 558 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 559 ifctx->state != IF_BOOTP_RESOLVED) { 560 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 561 ifctx->replylen, TAG_DHCP_SERVERID); 562 if (p != NULL && gctx->tmptag.taglen == 4) { 563 memcpy(&ifctx->dhcpserver, p, 4); 564 ifctx->gotdhcpserver = 1; 565 } else 566 ifctx->gotdhcpserver = 0; 567 return 1; 568 } 569 570 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 571 ifctx->replylen, 572 TAG_ROOT) != NULL); 573 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 574 ifctx->replylen, 575 TAG_ROUTERS) != NULL); 576 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 577 ifctx->replylen, 578 TAG_SUBNETMASK) != NULL); 579 return 1; 580 } 581 582 static int 583 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 584 { 585 struct sockaddr_in *sin, dst; 586 struct uio auio; 587 struct sockopt sopt; 588 struct iovec aio; 589 int error, on, rcvflg, timo, len; 590 time_t atimo; 591 time_t rtimo; 592 struct timeval tv; 593 struct bootpc_ifcontext *ifctx; 594 int outstanding; 595 int gotrootpath; 596 int retry; 597 const char *s; 598 599 tv.tv_sec = 1; 600 tv.tv_usec = 0; 601 bzero(&sopt, sizeof(sopt)); 602 sopt.sopt_dir = SOPT_SET; 603 sopt.sopt_level = SOL_SOCKET; 604 sopt.sopt_name = SO_RCVTIMEO; 605 sopt.sopt_val = &tv; 606 sopt.sopt_valsize = sizeof tv; 607 608 error = sosetopt(bootp_so, &sopt); 609 if (error != 0) 610 goto out; 611 612 /* 613 * Enable broadcast. 614 */ 615 on = 1; 616 sopt.sopt_name = SO_BROADCAST; 617 sopt.sopt_val = &on; 618 sopt.sopt_valsize = sizeof on; 619 620 error = sosetopt(bootp_so, &sopt); 621 if (error != 0) 622 goto out; 623 624 /* 625 * Disable routing. 626 */ 627 628 on = 1; 629 sopt.sopt_name = SO_DONTROUTE; 630 sopt.sopt_val = &on; 631 sopt.sopt_valsize = sizeof on; 632 633 error = sosetopt(bootp_so, &sopt); 634 if (error != 0) 635 goto out; 636 637 /* 638 * Bind the local endpoint to a bootp client port. 639 */ 640 sin = &dst; 641 clear_sinaddr(sin); 642 sin->sin_port = htons(IPPORT_BOOTPC); 643 error = sobind(bootp_so, (struct sockaddr *)sin, td); 644 if (error != 0) { 645 printf("bind failed\n"); 646 goto out; 647 } 648 649 /* 650 * Setup socket address for the server. 651 */ 652 sin = &dst; 653 clear_sinaddr(sin); 654 sin->sin_addr.s_addr = INADDR_BROADCAST; 655 sin->sin_port = htons(IPPORT_BOOTPS); 656 657 /* 658 * Send it, repeatedly, until a reply is received, 659 * but delay each re-send by an increasing amount. 660 * If the delay hits the maximum, start complaining. 661 */ 662 timo = 0; 663 rtimo = 0; 664 for (;;) { 665 666 outstanding = 0; 667 gotrootpath = 0; 668 669 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 670 if (bootpc_ifctx_isresolved(ifctx) != 0 && 671 bootpc_tag(&gctx->tmptag, &ifctx->reply, 672 ifctx->replylen, 673 TAG_ROOT) != NULL) 674 gotrootpath = 1; 675 } 676 677 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 678 struct in_aliasreq *ifra = &ifctx->iareq; 679 sin = (struct sockaddr_in *)&ifra->ifra_mask; 680 681 ifctx->outstanding = 0; 682 if (bootpc_ifctx_isresolved(ifctx) != 0 && 683 gotrootpath != 0) { 684 continue; 685 } 686 if (bootpc_ifctx_isfailed(ifctx) != 0) 687 continue; 688 689 outstanding++; 690 ifctx->outstanding = 1; 691 692 /* Proceed to next step in DHCP negotiation */ 693 if ((ifctx->state == IF_DHCP_OFFERED && 694 ifctx->dhcpquerytype != DHCP_REQUEST) || 695 (ifctx->state == IF_DHCP_UNRESOLVED && 696 ifctx->dhcpquerytype != DHCP_DISCOVER) || 697 (ifctx->state == IF_BOOTP_UNRESOLVED && 698 ifctx->dhcpquerytype != DHCP_NOMSG)) { 699 ifctx->sentmsg = 0; 700 bootpc_compose_query(ifctx, td); 701 } 702 703 /* Send BOOTP request (or re-send). */ 704 705 if (ifctx->sentmsg == 0) { 706 switch(ifctx->dhcpquerytype) { 707 case DHCP_DISCOVER: 708 s = "DHCP Discover"; 709 break; 710 case DHCP_REQUEST: 711 s = "DHCP Request"; 712 break; 713 case DHCP_NOMSG: 714 default: 715 s = "BOOTP Query"; 716 break; 717 } 718 printf("Sending %s packet from " 719 "interface %s (%*D)\n", 720 s, 721 ifctx->ireq.ifr_name, 722 ifctx->sdl->sdl_alen, 723 (unsigned char *) LLADDR(ifctx->sdl), 724 ":"); 725 ifctx->sentmsg = 1; 726 } 727 728 aio.iov_base = (caddr_t) &ifctx->call; 729 aio.iov_len = sizeof(ifctx->call); 730 731 auio.uio_iov = &aio; 732 auio.uio_iovcnt = 1; 733 auio.uio_segflg = UIO_SYSSPACE; 734 auio.uio_rw = UIO_WRITE; 735 auio.uio_offset = 0; 736 auio.uio_resid = sizeof(ifctx->call); 737 auio.uio_td = td; 738 739 /* Set netmask to 0.0.0.0 */ 740 clear_sinaddr(sin); 741 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 742 td); 743 if (error != 0) 744 panic("%s: SIOCAIFADDR, error=%d", __func__, 745 error); 746 747 error = sosend(bootp_so, (struct sockaddr *) &dst, 748 &auio, NULL, NULL, 0, td); 749 if (error != 0) 750 printf("%s: sosend: %d state %08x\n", __func__, 751 error, (int )bootp_so->so_state); 752 753 /* Set netmask to 255.0.0.0 */ 754 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET); 755 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 756 td); 757 if (error != 0) 758 panic("%s: SIOCAIFADDR, error=%d", __func__, 759 error); 760 } 761 762 if (outstanding == 0 && 763 (rtimo == 0 || time_second >= rtimo)) { 764 error = 0; 765 goto out; 766 } 767 768 /* Determine new timeout. */ 769 if (timo < MAX_RESEND_DELAY) 770 timo++; 771 else { 772 printf("DHCP/BOOTP timeout for server "); 773 print_sin_addr(&dst); 774 printf("\n"); 775 } 776 777 /* 778 * Wait for up to timo seconds for a reply. 779 * The socket receive timeout was set to 1 second. 780 */ 781 atimo = timo + time_second; 782 while (time_second < atimo) { 783 aio.iov_base = (caddr_t) &gctx->reply; 784 aio.iov_len = sizeof(gctx->reply); 785 786 auio.uio_iov = &aio; 787 auio.uio_iovcnt = 1; 788 auio.uio_segflg = UIO_SYSSPACE; 789 auio.uio_rw = UIO_READ; 790 auio.uio_offset = 0; 791 auio.uio_resid = sizeof(gctx->reply); 792 auio.uio_td = td; 793 794 rcvflg = 0; 795 error = soreceive(bootp_so, NULL, &auio, 796 NULL, NULL, &rcvflg); 797 gctx->secs = time_second - gctx->starttime; 798 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 799 if (bootpc_ifctx_isresolved(ifctx) != 0 || 800 bootpc_ifctx_isfailed(ifctx) != 0) 801 continue; 802 803 ifctx->call.secs = htons(gctx->secs); 804 } 805 if (error == EWOULDBLOCK) 806 continue; 807 if (error != 0) 808 goto out; 809 len = sizeof(gctx->reply) - auio.uio_resid; 810 811 /* Do we have the required number of bytes ? */ 812 if (len < BOOTP_MIN_LEN) 813 continue; 814 gctx->replylen = len; 815 816 /* Is it a reply? */ 817 if (gctx->reply.op != BOOTP_REPLY) 818 continue; 819 820 /* Is this an answer to our query */ 821 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 822 if (gctx->reply.xid != ifctx->call.xid) 823 continue; 824 825 /* Same HW address size ? */ 826 if (gctx->reply.hlen != ifctx->call.hlen) 827 continue; 828 829 /* Correct HW address ? */ 830 if (bcmp(gctx->reply.chaddr, 831 ifctx->call.chaddr, 832 ifctx->call.hlen) != 0) 833 continue; 834 835 break; 836 } 837 838 if (ifctx != NULL) { 839 s = bootpc_tag(&gctx->tmptag, 840 &gctx->reply, 841 gctx->replylen, 842 TAG_DHCP_MSGTYPE); 843 if (s != NULL) { 844 switch (*s) { 845 case DHCP_OFFER: 846 s = "DHCP Offer"; 847 break; 848 case DHCP_ACK: 849 s = "DHCP Ack"; 850 break; 851 default: 852 s = "DHCP (unexpected)"; 853 break; 854 } 855 } else 856 s = "BOOTP Reply"; 857 858 printf("Received %s packet" 859 " on %s from ", 860 s, 861 ifctx->ireq.ifr_name); 862 print_in_addr(gctx->reply.siaddr); 863 if (gctx->reply.giaddr.s_addr != 864 htonl(INADDR_ANY)) { 865 printf(" via "); 866 print_in_addr(gctx->reply.giaddr); 867 } 868 if (bootpc_received(gctx, ifctx) != 0) { 869 printf(" (accepted)"); 870 if (ifctx->outstanding) { 871 ifctx->outstanding = 0; 872 outstanding--; 873 } 874 /* Network settle delay */ 875 if (outstanding == 0) 876 atimo = time_second + 877 BOOTP_SETTLE_DELAY; 878 } else 879 printf(" (ignored)"); 880 if (ifctx->gotrootpath || 881 gctx->any_root_overrides) { 882 gotrootpath = 1; 883 rtimo = time_second + 884 BOOTP_SETTLE_DELAY; 885 if (ifctx->gotrootpath) 886 printf(" (got root path)"); 887 } 888 printf("\n"); 889 } 890 } /* while secs */ 891 #ifdef BOOTP_TIMEOUT 892 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0) 893 break; 894 #endif 895 /* Force a retry if halfway in DHCP negotiation */ 896 retry = 0; 897 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 898 if (ifctx->state == IF_DHCP_OFFERED) { 899 if (ifctx->dhcpquerytype == DHCP_DISCOVER) 900 retry = 1; 901 else 902 ifctx->state = IF_DHCP_UNRESOLVED; 903 } 904 905 if (retry != 0) 906 continue; 907 908 if (gotrootpath != 0) { 909 gctx->gotrootpath = gotrootpath; 910 if (rtimo != 0 && time_second >= rtimo) 911 break; 912 } 913 } /* forever send/receive */ 914 915 /* 916 * XXX: These are errors of varying seriousness being silently 917 * ignored 918 */ 919 920 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 921 if (bootpc_ifctx_isresolved(ifctx) == 0) { 922 printf("%s timeout for interface %s\n", 923 ifctx->dhcpquerytype != DHCP_NOMSG ? 924 "DHCP" : "BOOTP", 925 ifctx->ireq.ifr_name); 926 } 927 928 if (gctx->gotrootpath != 0) { 929 #if 0 930 printf("Got a root path, ignoring remaining timeout\n"); 931 #endif 932 error = 0; 933 goto out; 934 } 935 #ifndef BOOTP_NFSROOT 936 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 937 if (bootpc_ifctx_isresolved(ifctx) != 0) { 938 error = 0; 939 goto out; 940 } 941 #endif 942 error = ETIMEDOUT; 943 944 out: 945 return (error); 946 } 947 948 static void 949 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 950 { 951 struct ifreq *ifr; 952 struct in_aliasreq *ifra; 953 struct sockaddr_in *sin; 954 int error; 955 956 ifr = &ifctx->ireq; 957 ifra = &ifctx->iareq; 958 959 /* 960 * Bring up the interface. 961 * 962 * Get the old interface flags and or IFF_UP into them; if 963 * IFF_UP set blindly, interface selection can be clobbered. 964 */ 965 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 966 if (error != 0) 967 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 968 ifr->ifr_flags |= IFF_UP; 969 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 970 if (error != 0) 971 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 972 973 /* 974 * Do enough of ifconfig(8) so that the chosen interface 975 * can talk to the servers. Set address to 0.0.0.0/8 and 976 * broadcast address to local broadcast. 977 */ 978 sin = (struct sockaddr_in *)&ifra->ifra_addr; 979 clear_sinaddr(sin); 980 sin = (struct sockaddr_in *)&ifra->ifra_mask; 981 clear_sinaddr(sin); 982 sin->sin_addr.s_addr = htonl(IN_CLASSA_NET); 983 sin = (struct sockaddr_in *)&ifra->ifra_broadaddr; 984 clear_sinaddr(sin); 985 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST); 986 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 987 if (error != 0) 988 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 989 } 990 991 static void 992 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 993 { 994 struct ifreq *ifr; 995 struct sockaddr_in *sin; 996 int error; 997 998 ifr = &ifctx->ireq; 999 1000 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); 1001 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 1002 if (error != 0) 1003 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 1004 ifr->ifr_flags &= ~IFF_UP; 1005 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 1006 if (error != 0) 1007 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 1008 1009 sin = (struct sockaddr_in *) &ifr->ifr_addr; 1010 clear_sinaddr(sin); 1011 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 1012 if (error != 0) 1013 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 1014 } 1015 1016 static void 1017 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 1018 struct bootpc_globalcontext *gctx, struct thread *td) 1019 { 1020 int error; 1021 struct sockaddr_in *sin; 1022 struct ifreq *ifr; 1023 struct in_aliasreq *ifra; 1024 struct sockaddr_in *myaddr; 1025 struct sockaddr_in *netmask; 1026 1027 ifr = &ifctx->ireq; 1028 ifra = &ifctx->iareq; 1029 myaddr = &ifctx->myaddr; 1030 netmask = &ifctx->netmask; 1031 1032 if (bootpc_ifctx_isresolved(ifctx) == 0) { 1033 /* Shutdown interfaces where BOOTP failed */ 1034 bootpc_shutdown_interface(ifctx, td); 1035 return; 1036 } 1037 1038 printf("Adjusted interface %s", ifctx->ireq.ifr_name); 1039 1040 /* Do BOOTP interface options */ 1041 if (ifctx->mtu != 0) { 1042 printf(" (MTU=%d%s)", ifctx->mtu, 1043 (ifctx->mtu > 1514) ? "/JUMBO" : ""); 1044 ifr->ifr_mtu = ifctx->mtu; 1045 error = ifioctl(bootp_so, SIOCSIFMTU, (caddr_t) ifr, td); 1046 if (error != 0) 1047 panic("%s: SIOCSIFMTU, error=%d", __func__, error); 1048 } 1049 printf("\n"); 1050 1051 /* 1052 * Do enough of ifconfig(8) so that the chosen interface 1053 * can talk to the servers. (just set the address) 1054 */ 1055 sin = (struct sockaddr_in *) &ifr->ifr_addr; 1056 clear_sinaddr(sin); 1057 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 1058 if (error != 0) 1059 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 1060 1061 bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr)); 1062 bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask)); 1063 clear_sinaddr(&ifra->ifra_broadaddr); 1064 ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr | 1065 ~netmask->sin_addr.s_addr; 1066 1067 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 1068 if (error != 0) 1069 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 1070 } 1071 1072 static void 1073 bootpc_add_default_route(struct bootpc_ifcontext *ifctx) 1074 { 1075 int error; 1076 struct sockaddr_in defdst; 1077 struct sockaddr_in defmask; 1078 1079 if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY)) 1080 return; 1081 1082 clear_sinaddr(&defdst); 1083 clear_sinaddr(&defmask); 1084 1085 error = rtrequest_fib(RTM_ADD, (struct sockaddr *)&defdst, 1086 (struct sockaddr *) &ifctx->gw, (struct sockaddr *)&defmask, 1087 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB); 1088 if (error != 0) { 1089 printf("%s: RTM_ADD, error=%d\n", __func__, error); 1090 } 1091 } 1092 1093 static void 1094 bootpc_remove_default_route(struct bootpc_ifcontext *ifctx) 1095 { 1096 int error; 1097 struct sockaddr_in defdst; 1098 struct sockaddr_in defmask; 1099 1100 if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY)) 1101 return; 1102 1103 clear_sinaddr(&defdst); 1104 clear_sinaddr(&defmask); 1105 1106 error = rtrequest_fib(RTM_DELETE, (struct sockaddr *)&defdst, 1107 (struct sockaddr *) &ifctx->gw, (struct sockaddr *)&defmask, 1108 (RTF_UP | RTF_GATEWAY | RTF_STATIC), NULL, RT_DEFAULT_FIB); 1109 if (error != 0) { 1110 printf("%s: RTM_DELETE, error=%d\n", __func__, error); 1111 } 1112 } 1113 1114 static int 1115 setfs(struct sockaddr_in *addr, char *path, char *p, 1116 const struct in_addr *siaddr) 1117 { 1118 1119 if (getip(&p, &addr->sin_addr) == 0) { 1120 if (siaddr != NULL && *p == '/') 1121 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr)); 1122 else 1123 return 0; 1124 } else { 1125 if (*p != ':') 1126 return 0; 1127 p++; 1128 } 1129 1130 addr->sin_len = sizeof(struct sockaddr_in); 1131 addr->sin_family = AF_INET; 1132 1133 strlcpy(path, p, MNAMELEN); 1134 return 1; 1135 } 1136 1137 static int 1138 getip(char **ptr, struct in_addr *addr) 1139 { 1140 char *p; 1141 unsigned int ip; 1142 int val; 1143 1144 p = *ptr; 1145 ip = 0; 1146 if (((val = getdec(&p)) < 0) || (val > 255)) 1147 return 0; 1148 ip = val << 24; 1149 if (*p != '.') 1150 return 0; 1151 p++; 1152 if (((val = getdec(&p)) < 0) || (val > 255)) 1153 return 0; 1154 ip |= (val << 16); 1155 if (*p != '.') 1156 return 0; 1157 p++; 1158 if (((val = getdec(&p)) < 0) || (val > 255)) 1159 return 0; 1160 ip |= (val << 8); 1161 if (*p != '.') 1162 return 0; 1163 p++; 1164 if (((val = getdec(&p)) < 0) || (val > 255)) 1165 return 0; 1166 ip |= val; 1167 1168 addr->s_addr = htonl(ip); 1169 *ptr = p; 1170 return 1; 1171 } 1172 1173 static int 1174 getdec(char **ptr) 1175 { 1176 char *p; 1177 int ret; 1178 1179 p = *ptr; 1180 ret = 0; 1181 if ((*p < '') || (*p > '9')) 1182 return -1; 1183 while ((*p >= '') && (*p <= '9')) { 1184 ret = ret * 10 + (*p - ''); 1185 p++; 1186 } 1187 *ptr = p; 1188 return ret; 1189 } 1190 1191 static void 1192 mountopts(struct nfs_args *args, char *p) 1193 { 1194 args->version = NFS_ARGSVERSION; 1195 args->rsize = BOOTP_BLOCKSIZE; 1196 args->wsize = BOOTP_BLOCKSIZE; 1197 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 1198 args->sotype = SOCK_DGRAM; 1199 if (p != NULL) 1200 nfs_parse_options(p, args); 1201 } 1202 1203 static int 1204 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 1205 { 1206 struct mbuf *m; 1207 int alignedlen; 1208 1209 m = *mptr; 1210 alignedlen = ( len + 3 ) & ~3; 1211 1212 if (m->m_len < alignedlen) { 1213 m = m_pullup(m, alignedlen); 1214 if (m == NULL) { 1215 *mptr = NULL; 1216 return EBADRPC; 1217 } 1218 } 1219 bcopy(mtod(m, u_char *), buf, len); 1220 m_adj(m, alignedlen); 1221 *mptr = m; 1222 return 0; 1223 } 1224 1225 static int 1226 xdr_int_decode(struct mbuf **mptr, int *iptr) 1227 { 1228 u_int32_t i; 1229 1230 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 1231 return EBADRPC; 1232 *iptr = fxdr_unsigned(u_int32_t, i); 1233 return 0; 1234 } 1235 1236 static void 1237 print_sin_addr(struct sockaddr_in *sin) 1238 { 1239 1240 print_in_addr(sin->sin_addr); 1241 } 1242 1243 static void 1244 print_in_addr(struct in_addr addr) 1245 { 1246 unsigned int ip; 1247 1248 ip = ntohl(addr.s_addr); 1249 printf("%d.%d.%d.%d", 1250 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); 1251 } 1252 1253 static void 1254 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td) 1255 { 1256 unsigned char *vendp; 1257 unsigned char vendor_client[64]; 1258 uint32_t leasetime; 1259 uint8_t vendor_client_len; 1260 1261 ifctx->gotrootpath = 0; 1262 1263 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call)); 1264 1265 /* bootpc part */ 1266 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */ 1267 ifctx->call.htype = 1; /* 10mb ethernet */ 1268 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */ 1269 ifctx->call.hops = 0; 1270 if (bootpc_ifctx_isunresolved(ifctx) != 0) 1271 ifctx->xid++; 1272 ifctx->call.xid = txdr_unsigned(ifctx->xid); 1273 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); 1274 1275 vendp = ifctx->call.vend; 1276 *vendp++ = 99; /* RFC1048 cookie */ 1277 *vendp++ = 130; 1278 *vendp++ = 83; 1279 *vendp++ = 99; 1280 *vendp++ = TAG_MAXMSGSIZE; 1281 *vendp++ = 2; 1282 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; 1283 *vendp++ = sizeof(struct bootp_packet) & 255; 1284 1285 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", 1286 ostype, MACHINE, osrelease); 1287 vendor_client_len = strlen(vendor_client); 1288 *vendp++ = TAG_VENDOR_INDENTIFIER; 1289 *vendp++ = vendor_client_len; 1290 memcpy(vendp, vendor_client, vendor_client_len); 1291 vendp += vendor_client_len; 1292 ifctx->dhcpquerytype = DHCP_NOMSG; 1293 switch (ifctx->state) { 1294 case IF_DHCP_UNRESOLVED: 1295 *vendp++ = TAG_DHCP_MSGTYPE; 1296 *vendp++ = 1; 1297 *vendp++ = DHCP_DISCOVER; 1298 ifctx->dhcpquerytype = DHCP_DISCOVER; 1299 ifctx->gotdhcpserver = 0; 1300 break; 1301 case IF_DHCP_OFFERED: 1302 *vendp++ = TAG_DHCP_MSGTYPE; 1303 *vendp++ = 1; 1304 *vendp++ = DHCP_REQUEST; 1305 ifctx->dhcpquerytype = DHCP_REQUEST; 1306 *vendp++ = TAG_DHCP_REQ_ADDR; 1307 *vendp++ = 4; 1308 memcpy(vendp, &ifctx->reply.yiaddr, 4); 1309 vendp += 4; 1310 if (ifctx->gotdhcpserver != 0) { 1311 *vendp++ = TAG_DHCP_SERVERID; 1312 *vendp++ = 4; 1313 memcpy(vendp, &ifctx->dhcpserver, 4); 1314 vendp += 4; 1315 } 1316 *vendp++ = TAG_DHCP_LEASETIME; 1317 *vendp++ = 4; 1318 leasetime = htonl(300); 1319 memcpy(vendp, &leasetime, 4); 1320 vendp += 4; 1321 break; 1322 default: 1323 break; 1324 } 1325 *vendp = TAG_END; 1326 1327 ifctx->call.secs = 0; 1328 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */ 1329 } 1330 1331 static int 1332 bootpc_hascookie(struct bootp_packet *bp) 1333 { 1334 1335 return (bp->vend[0] == 99 && bp->vend[1] == 130 && 1336 bp->vend[2] == 83 && bp->vend[3] == 99); 1337 } 1338 1339 static void 1340 bootpc_tag_helper(struct bootpc_tagcontext *tctx, 1341 unsigned char *start, int len, int tag) 1342 { 1343 unsigned char *j; 1344 unsigned char *ej; 1345 unsigned char code; 1346 1347 if (tctx->badtag != 0 || tctx->badopt != 0) 1348 return; 1349 1350 j = start; 1351 ej = j + len; 1352 1353 while (j < ej) { 1354 code = *j++; 1355 if (code == TAG_PAD) 1356 continue; 1357 if (code == TAG_END) 1358 return; 1359 if (j >= ej || j + *j + 1 > ej) { 1360 tctx->badopt = 1; 1361 return; 1362 } 1363 len = *j++; 1364 if (code == tag) { 1365 if (tctx->taglen + len > TAG_MAXLEN) { 1366 tctx->badtag = 1; 1367 return; 1368 } 1369 tctx->foundopt = 1; 1370 if (len > 0) 1371 memcpy(tctx->buf + tctx->taglen, 1372 j, len); 1373 tctx->taglen += len; 1374 } 1375 if (code == TAG_OVERLOAD) 1376 tctx->overload = *j; 1377 1378 j += len; 1379 } 1380 } 1381 1382 static unsigned char * 1383 bootpc_tag(struct bootpc_tagcontext *tctx, 1384 struct bootp_packet *bp, int len, int tag) 1385 { 1386 tctx->overload = 0; 1387 tctx->badopt = 0; 1388 tctx->badtag = 0; 1389 tctx->foundopt = 0; 1390 tctx->taglen = 0; 1391 1392 if (bootpc_hascookie(bp) == 0) 1393 return NULL; 1394 1395 bootpc_tag_helper(tctx, &bp->vend[4], 1396 (unsigned char *) bp + len - &bp->vend[4], tag); 1397 1398 if ((tctx->overload & OVERLOAD_FILE) != 0) 1399 bootpc_tag_helper(tctx, 1400 (unsigned char *) bp->file, 1401 sizeof(bp->file), 1402 tag); 1403 if ((tctx->overload & OVERLOAD_SNAME) != 0) 1404 bootpc_tag_helper(tctx, 1405 (unsigned char *) bp->sname, 1406 sizeof(bp->sname), 1407 tag); 1408 1409 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0) 1410 return NULL; 1411 tctx->buf[tctx->taglen] = '\0'; 1412 return tctx->buf; 1413 } 1414 1415 static void 1416 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx, 1417 struct bootpc_globalcontext *gctx) 1418 { 1419 char *p, *s; 1420 unsigned int ip; 1421 1422 ifctx->gotgw = 0; 1423 ifctx->gotnetmask = 0; 1424 1425 clear_sinaddr(&ifctx->myaddr); 1426 clear_sinaddr(&ifctx->netmask); 1427 clear_sinaddr(&ifctx->gw); 1428 1429 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1430 1431 ip = ntohl(ifctx->myaddr.sin_addr.s_addr); 1432 1433 printf("%s at ", ifctx->ireq.ifr_name); 1434 print_sin_addr(&ifctx->myaddr); 1435 printf(" server "); 1436 print_in_addr(ifctx->reply.siaddr); 1437 1438 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1439 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1440 printf(" via gateway "); 1441 print_in_addr(ifctx->reply.giaddr); 1442 } 1443 1444 /* This call used for the side effect (overload flag) */ 1445 (void) bootpc_tag(&gctx->tmptag, 1446 &ifctx->reply, ifctx->replylen, TAG_END); 1447 1448 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1449 if (ifctx->reply.sname[0] != '\0') 1450 printf(" server name %s", ifctx->reply.sname); 1451 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1452 if (ifctx->reply.file[0] != '\0') 1453 printf(" boot file %s", ifctx->reply.file); 1454 1455 printf("\n"); 1456 1457 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1458 TAG_SUBNETMASK); 1459 if (p != NULL) { 1460 if (gctx->tag.taglen != 4) 1461 panic("bootpc: subnet mask len is %d", 1462 gctx->tag.taglen); 1463 bcopy(p, &ifctx->netmask.sin_addr, 4); 1464 ifctx->gotnetmask = 1; 1465 printf("subnet mask "); 1466 print_sin_addr(&ifctx->netmask); 1467 printf(" "); 1468 } 1469 1470 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1471 TAG_ROUTERS); 1472 if (p != NULL) { 1473 /* Routers */ 1474 if (gctx->tag.taglen % 4) 1475 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1476 if (gctx->tag.taglen > 0) { 1477 bcopy(p, &ifctx->gw.sin_addr, 4); 1478 printf("router "); 1479 print_sin_addr(&ifctx->gw); 1480 printf(" "); 1481 ifctx->gotgw = 1; 1482 gctx->gotgw = 1; 1483 } 1484 } 1485 1486 /* 1487 * Choose a root filesystem. If a value is forced in the environment 1488 * and it contains "nfs:", use it unconditionally. Otherwise, if the 1489 * kernel is compiled with the ROOTDEVNAME option, then use it if: 1490 * - The server doesn't provide a pathname. 1491 * - The boothowto flags include RB_DFLTROOT (user said to override 1492 * the server value). 1493 */ 1494 p = NULL; 1495 if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) { 1496 if ((p = strstr(s, "nfs:")) != NULL) 1497 p = strdup(p + 4, M_TEMP); 1498 freeenv(s); 1499 } 1500 if (p == NULL) { 1501 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1502 TAG_ROOT); 1503 if (p != NULL) 1504 ifctx->gotrootpath = 1; 1505 } 1506 #ifdef ROOTDEVNAME 1507 if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) && 1508 (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) { 1509 p += 4; 1510 } 1511 #endif 1512 if (p != NULL) { 1513 if (gctx->setrootfs != NULL) { 1514 printf("rootfs %s (ignored) ", p); 1515 } else if (setfs(&nd->root_saddr, 1516 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1517 if (*p == '/') { 1518 printf("root_server "); 1519 print_sin_addr(&nd->root_saddr); 1520 printf(" "); 1521 } 1522 printf("rootfs %s ", p); 1523 gctx->gotrootpath = 1; 1524 gctx->setrootfs = ifctx; 1525 1526 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1527 ifctx->replylen, 1528 TAG_ROOTOPTS); 1529 if (p != NULL) { 1530 mountopts(&nd->root_args, p); 1531 printf("rootopts %s ", p); 1532 } 1533 } else 1534 panic("Failed to set rootfs to %s", p); 1535 } 1536 1537 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1538 TAG_HOSTNAME); 1539 if (p != NULL) { 1540 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1541 panic("bootpc: hostname >= %d bytes", 1542 MAXHOSTNAMELEN); 1543 if (gctx->sethostname != NULL) { 1544 printf("hostname %s (ignored) ", p); 1545 } else { 1546 strcpy(nd->my_hostnam, p); 1547 mtx_lock(&prison0.pr_mtx); 1548 strcpy(prison0.pr_hostname, p); 1549 mtx_unlock(&prison0.pr_mtx); 1550 printf("hostname %s ", p); 1551 gctx->sethostname = ifctx; 1552 } 1553 } 1554 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1555 TAG_COOKIE); 1556 if (p != NULL) { /* store in a sysctl variable */ 1557 int i, l = sizeof(bootp_cookie) - 1; 1558 for (i = 0; i < l && p[i] != '\0'; i++) 1559 bootp_cookie[i] = p[i]; 1560 p[i] = '\0'; 1561 } 1562 1563 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1564 TAG_INTF_MTU); 1565 if (p != NULL) { 1566 ifctx->mtu = be16dec(p); 1567 } 1568 1569 printf("\n"); 1570 1571 if (ifctx->gotnetmask == 0) { 1572 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1573 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1574 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1575 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1576 else 1577 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1578 } 1579 } 1580 1581 void 1582 bootpc_init(void) 1583 { 1584 struct bootpc_ifcontext *ifctx; /* Interface BOOTP contexts */ 1585 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1586 struct ifnet *ifp; 1587 struct sockaddr_dl *sdl; 1588 struct ifaddr *ifa; 1589 int error; 1590 #ifndef BOOTP_WIRED_TO 1591 int ifcnt; 1592 #endif 1593 struct nfsv3_diskless *nd; 1594 struct thread *td; 1595 int timeout; 1596 int delay; 1597 1598 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz; 1599 delay = hz / 10; 1600 1601 nd = &nfsv3_diskless; 1602 td = curthread; 1603 1604 /* 1605 * If already filled in, don't touch it here 1606 */ 1607 if (nfs_diskless_valid != 0) 1608 return; 1609 1610 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1611 STAILQ_INIT(&gctx->interfaces); 1612 gctx->xid = ~0xFFFF; 1613 gctx->starttime = time_second; 1614 1615 /* 1616 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have 1617 * root-path overrides that can potentially let us boot even if we don't 1618 * get a root path from the server, so we can treat that as a non-error. 1619 */ 1620 #ifdef ROOTDEVNAME 1621 gctx->any_root_overrides = 1; 1622 #else 1623 gctx->any_root_overrides = testenv("vfs.root.mountfrom"); 1624 #endif 1625 1626 /* 1627 * Find a network interface. 1628 */ 1629 CURVNET_SET(TD_TO_VNET(td)); 1630 #ifdef BOOTP_WIRED_TO 1631 printf("%s: wired to interface '%s'\n", __func__, 1632 __XSTRING(BOOTP_WIRED_TO)); 1633 allocifctx(gctx); 1634 #else 1635 /* 1636 * Preallocate interface context storage, if another interface 1637 * attaches and wins the race, it won't be eligible for bootp. 1638 */ 1639 ifcnt = 0; 1640 IFNET_RLOCK(); 1641 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1642 if ((ifp->if_flags & 1643 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1644 IFF_BROADCAST) 1645 continue; 1646 switch (ifp->if_alloctype) { 1647 case IFT_ETHER: 1648 break; 1649 default: 1650 continue; 1651 } 1652 ifcnt++; 1653 } 1654 IFNET_RUNLOCK(); 1655 if (ifcnt == 0) 1656 panic("%s: no eligible interfaces", __func__); 1657 for (; ifcnt > 0; ifcnt--) 1658 allocifctx(gctx); 1659 #endif 1660 1661 retry: 1662 ifctx = STAILQ_FIRST(&gctx->interfaces); 1663 IFNET_RLOCK(); 1664 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1665 if (ifctx == NULL) 1666 break; 1667 #ifdef BOOTP_WIRED_TO 1668 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0) 1669 continue; 1670 #else 1671 if ((ifp->if_flags & 1672 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1673 IFF_BROADCAST) 1674 continue; 1675 switch (ifp->if_alloctype) { 1676 case IFT_ETHER: 1677 break; 1678 default: 1679 continue; 1680 } 1681 #endif 1682 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1683 sizeof(ifctx->ireq.ifr_name)); 1684 ifctx->ifp = ifp; 1685 1686 /* Get HW address */ 1687 sdl = NULL; 1688 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1689 if (ifa->ifa_addr->sa_family == AF_LINK) { 1690 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1691 if (sdl->sdl_type == IFT_ETHER) 1692 break; 1693 } 1694 if (sdl == NULL) 1695 panic("bootpc: Unable to find HW address for %s", 1696 ifctx->ireq.ifr_name); 1697 ifctx->sdl = sdl; 1698 1699 ifctx = STAILQ_NEXT(ifctx, next); 1700 } 1701 IFNET_RUNLOCK(); 1702 CURVNET_RESTORE(); 1703 1704 if (STAILQ_EMPTY(&gctx->interfaces) || 1705 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) { 1706 if (timeout > 0) { 1707 pause("bootpc", delay); 1708 timeout -= delay; 1709 goto retry; 1710 } 1711 #ifdef BOOTP_WIRED_TO 1712 panic("%s: Could not find interface specified " 1713 "by BOOTP_WIRED_TO: " 1714 __XSTRING(BOOTP_WIRED_TO), __func__); 1715 #else 1716 panic("%s: no suitable interface", __func__); 1717 #endif 1718 } 1719 1720 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td); 1721 if (error != 0) 1722 panic("%s: socreate, error=%d", __func__, error); 1723 1724 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1725 bootpc_fakeup_interface(ifctx, td); 1726 1727 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1728 bootpc_compose_query(ifctx, td); 1729 1730 error = bootpc_call(gctx, td); 1731 if (error != 0) { 1732 printf("BOOTP call failed\n"); 1733 } 1734 1735 mountopts(&nd->root_args, NULL); 1736 1737 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1738 if (bootpc_ifctx_isresolved(ifctx) != 0) 1739 bootpc_decode_reply(nd, ifctx, gctx); 1740 1741 #ifdef BOOTP_NFSROOT 1742 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0) 1743 panic("bootpc: No root path offered"); 1744 #endif 1745 1746 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1747 bootpc_adjust_interface(ifctx, gctx, td); 1748 1749 soclose(bootp_so); 1750 1751 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1752 if (ifctx->gotrootpath != 0) 1753 break; 1754 if (ifctx == NULL) { 1755 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1756 if (bootpc_ifctx_isresolved(ifctx) != 0) 1757 break; 1758 } 1759 if (ifctx == NULL) 1760 goto out; 1761 1762 if (gctx->gotrootpath != 0) { 1763 1764 kern_setenv("boot.netif.name", ifctx->ifp->if_xname); 1765 1766 bootpc_add_default_route(ifctx); 1767 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1768 nd->root_fh, &nd->root_fhsize, 1769 &nd->root_args, td); 1770 bootpc_remove_default_route(ifctx); 1771 if (error != 0) { 1772 if (gctx->any_root_overrides == 0) 1773 panic("nfs_boot: mount root, error=%d", error); 1774 else 1775 goto out; 1776 } 1777 rootdevnames[0] = "nfs:"; 1778 nfs_diskless_valid = 3; 1779 } 1780 1781 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1782 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1783 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1784 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1785 ifctx->myaddr.sin_addr.s_addr | 1786 ~ ifctx->netmask.sin_addr.s_addr; 1787 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1788 bcopy(&ifctx->gw, &nd->mygateway, sizeof(ifctx->gw)); 1789 1790 out: 1791 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) { 1792 STAILQ_REMOVE_HEAD(&gctx->interfaces, next); 1793 free(ifctx, M_TEMP); 1794 } 1795 free(gctx, M_TEMP); 1796 } 1797 1798 /* 1799 * RPC: mountd/mount 1800 * Given a server pathname, get an NFS file handle. 1801 * Also, sets sin->sin_port to the NFS service port. 1802 */ 1803 static int 1804 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1805 struct nfs_args *args, struct thread *td) 1806 { 1807 struct mbuf *m; 1808 int error; 1809 int authunixok; 1810 int authcount; 1811 int authver; 1812 1813 #define RPCPROG_MNT 100005 1814 #define RPCMNT_VER1 1 1815 #define RPCMNT_VER3 3 1816 #define RPCMNT_MOUNT 1 1817 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1818 #define AUTH_UNIX AUTH_SYS 1819 1820 /* XXX honor v2/v3 flags in args->flags? */ 1821 #ifdef BOOTP_NFSV3 1822 /* First try NFS v3 */ 1823 /* Get port number for MOUNTD. */ 1824 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1825 &mdsin->sin_port, td); 1826 if (error == 0) { 1827 m = xdr_string_encode(path, strlen(path)); 1828 1829 /* Do RPC to mountd. */ 1830 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1831 RPCMNT_MOUNT, &m, NULL, td); 1832 } 1833 if (error == 0) { 1834 args->flags |= NFSMNT_NFSV3; 1835 } else { 1836 #endif 1837 /* Fallback to NFS v2 */ 1838 1839 /* Get port number for MOUNTD. */ 1840 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1841 &mdsin->sin_port, td); 1842 if (error != 0) 1843 return error; 1844 1845 m = xdr_string_encode(path, strlen(path)); 1846 1847 /* Do RPC to mountd. */ 1848 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1849 RPCMNT_MOUNT, &m, NULL, td); 1850 if (error != 0) 1851 return error; /* message already freed */ 1852 1853 #ifdef BOOTP_NFSV3 1854 } 1855 #endif 1856 1857 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1858 goto bad; 1859 1860 if ((args->flags & NFSMNT_NFSV3) != 0) { 1861 if (xdr_int_decode(&m, fhsizep) != 0 || 1862 *fhsizep > NFSX_V3FHMAX || 1863 *fhsizep <= 0) 1864 goto bad; 1865 } else 1866 *fhsizep = NFSX_V2FH; 1867 1868 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1869 goto bad; 1870 1871 if (args->flags & NFSMNT_NFSV3) { 1872 if (xdr_int_decode(&m, &authcount) != 0) 1873 goto bad; 1874 authunixok = 0; 1875 if (authcount < 0 || authcount > 100) 1876 goto bad; 1877 while (authcount > 0) { 1878 if (xdr_int_decode(&m, &authver) != 0) 1879 goto bad; 1880 if (authver == AUTH_UNIX) 1881 authunixok = 1; 1882 authcount--; 1883 } 1884 if (authunixok == 0) 1885 goto bad; 1886 } 1887 1888 /* Set port number for NFS use. */ 1889 error = krpc_portmap(mdsin, NFS_PROG, 1890 (args->flags & 1891 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1892 &mdsin->sin_port, td); 1893 1894 goto out; 1895 1896 bad: 1897 error = EBADRPC; 1898 1899 out: 1900 m_freem(m); 1901 return error; 1902 } 1903 1904 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
Cache object: 9a90afa3d2bbc3a2e57d35775a3bd590
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