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 #define IN_HISTORICAL_NETS /* include class masks */ 46 47 #include <sys/cdefs.h> 48 __FBSDID("$FreeBSD$"); 49 50 #include "opt_bootp.h" 51 #include "opt_nfs.h" 52 #include "opt_rootdevname.h" 53 54 #include <sys/param.h> 55 #include <sys/systm.h> 56 #include <sys/endian.h> 57 #include <sys/jail.h> 58 #include <sys/kernel.h> 59 #include <sys/sockio.h> 60 #include <sys/malloc.h> 61 #include <sys/mount.h> 62 #include <sys/mbuf.h> 63 #include <sys/proc.h> 64 #include <sys/reboot.h> 65 #include <sys/socket.h> 66 #include <sys/socketvar.h> 67 #include <sys/sysctl.h> 68 #include <sys/uio.h> 69 70 #include <net/if.h> 71 #include <net/if_var.h> 72 #include <net/route.h> 73 #include <net/route/route_ctl.h> 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_if(struct ifnet *ifp, struct ifaddr *ifa); 267 void bootpboot_p_iflist(void); 268 #endif 269 270 static int bootpc_call(struct bootpc_globalcontext *gctx, 271 struct thread *td); 272 273 static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 274 struct thread *td); 275 276 static void bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 277 struct bootpc_globalcontext *gctx, struct thread *td); 278 279 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 280 struct bootpc_ifcontext *ifctx, 281 struct bootpc_globalcontext *gctx); 282 283 static int bootpc_received(struct bootpc_globalcontext *gctx, 284 struct bootpc_ifcontext *ifctx); 285 286 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 287 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 288 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 289 290 /* 291 * In order to have multiple active interfaces with address 0.0.0.0 292 * and be able to send data to a selected interface, we first set 293 * mask to /8 on all interfaces, and temporarily set it to /0 when 294 * doing sosend(). 295 */ 296 297 #ifdef BOOTP_DEBUG 298 void 299 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 300 { 301 302 printf("%s flags %x, addr ", 303 ifp->if_xname, ifp->if_flags); 304 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 305 printf(", broadcast "); 306 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 307 printf(", netmask "); 308 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 309 printf("\n"); 310 } 311 312 void 313 bootpboot_p_iflist(void) 314 { 315 struct ifnet *ifp; 316 struct ifaddr *ifa; 317 318 printf("Interface list:\n"); 319 IFNET_RLOCK(); 320 for (ifp = CK_STAILQ_FIRST(&V_ifnet); 321 ifp != NULL; 322 ifp = CK_STAILQ_NEXT(ifp, if_link)) { 323 for (ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 324 ifa != NULL; 325 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) 326 if (ifa->ifa_addr->sa_family == AF_INET) 327 bootpboot_p_if(ifp, ifa); 328 } 329 IFNET_RUNLOCK(); 330 } 331 #endif /* defined(BOOTP_DEBUG) */ 332 333 static void 334 clear_sinaddr(struct sockaddr_in *sin) 335 { 336 337 bzero(sin, sizeof(*sin)); 338 sin->sin_len = sizeof(*sin); 339 sin->sin_family = AF_INET; 340 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 341 sin->sin_port = 0; 342 } 343 344 static void 345 allocifctx(struct bootpc_globalcontext *gctx) 346 { 347 struct bootpc_ifcontext *ifctx; 348 349 ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO); 350 ifctx->xid = gctx->xid; 351 #ifdef BOOTP_NO_DHCP 352 ifctx->state = IF_BOOTP_UNRESOLVED; 353 #else 354 ifctx->state = IF_DHCP_UNRESOLVED; 355 #endif 356 gctx->xid += 0x100; 357 STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next); 358 } 359 360 static __inline int 361 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 362 { 363 364 if (ifctx->state == IF_BOOTP_RESOLVED || 365 ifctx->state == IF_DHCP_RESOLVED) 366 return 1; 367 return 0; 368 } 369 370 static __inline int 371 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 372 { 373 374 if (ifctx->state == IF_BOOTP_UNRESOLVED || 375 ifctx->state == IF_DHCP_UNRESOLVED) 376 return 1; 377 return 0; 378 } 379 380 static __inline int 381 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 382 { 383 384 if (ifctx->state == IF_BOOTP_FAILED || 385 ifctx->state == IF_DHCP_FAILED) 386 return 1; 387 return 0; 388 } 389 390 static int 391 bootpc_received(struct bootpc_globalcontext *gctx, 392 struct bootpc_ifcontext *ifctx) 393 { 394 unsigned char dhcpreplytype; 395 char *p; 396 397 /* 398 * Need timeout for fallback to less 399 * desirable alternative. 400 */ 401 402 /* This call used for the side effect (badopt flag) */ 403 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 404 gctx->replylen, 405 TAG_END); 406 407 /* If packet is invalid, ignore it */ 408 if (gctx->tmptag.badopt != 0) 409 return 0; 410 411 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 412 gctx->replylen, TAG_DHCP_MSGTYPE); 413 if (p != NULL) 414 dhcpreplytype = *p; 415 else 416 dhcpreplytype = DHCP_NOMSG; 417 418 switch (ifctx->dhcpquerytype) { 419 case DHCP_DISCOVER: 420 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 421 #ifndef BOOTP_FORCE_DHCP 422 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 423 #endif 424 ) 425 return 0; 426 break; 427 case DHCP_REQUEST: 428 if (dhcpreplytype != DHCP_ACK) 429 return 0; 430 case DHCP_NOMSG: 431 break; 432 } 433 434 /* Ignore packet unless it gives us a root tag we didn't have */ 435 436 if ((ifctx->state == IF_BOOTP_RESOLVED || 437 (ifctx->dhcpquerytype == DHCP_DISCOVER && 438 (ifctx->state == IF_DHCP_OFFERED || 439 ifctx->state == IF_DHCP_RESOLVED))) && 440 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 441 ifctx->replylen, 442 TAG_ROOT) != NULL || 443 bootpc_tag(&gctx->tmptag, &gctx->reply, 444 gctx->replylen, 445 TAG_ROOT) == NULL)) 446 return 0; 447 448 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 449 ifctx->replylen = gctx->replylen; 450 451 /* XXX: Only reset if 'perfect' response */ 452 if (ifctx->state == IF_BOOTP_UNRESOLVED) 453 ifctx->state = IF_BOOTP_RESOLVED; 454 else if (ifctx->state == IF_DHCP_UNRESOLVED && 455 ifctx->dhcpquerytype == DHCP_DISCOVER) { 456 if (dhcpreplytype == DHCP_OFFER) 457 ifctx->state = IF_DHCP_OFFERED; 458 else 459 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 460 } else if (ifctx->state == IF_DHCP_OFFERED && 461 ifctx->dhcpquerytype == DHCP_REQUEST) 462 ifctx->state = IF_DHCP_RESOLVED; 463 464 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 465 ifctx->state != IF_BOOTP_RESOLVED) { 466 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 467 ifctx->replylen, TAG_DHCP_SERVERID); 468 if (p != NULL && gctx->tmptag.taglen == 4) { 469 memcpy(&ifctx->dhcpserver, p, 4); 470 ifctx->gotdhcpserver = 1; 471 } else 472 ifctx->gotdhcpserver = 0; 473 return 1; 474 } 475 476 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 477 ifctx->replylen, 478 TAG_ROOT) != NULL); 479 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 480 ifctx->replylen, 481 TAG_ROUTERS) != NULL); 482 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 483 ifctx->replylen, 484 TAG_SUBNETMASK) != NULL); 485 return 1; 486 } 487 488 static int 489 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 490 { 491 struct sockaddr_in *sin, dst; 492 struct uio auio; 493 struct sockopt sopt; 494 struct iovec aio; 495 int error, on, rcvflg, timo, len; 496 time_t atimo; 497 time_t rtimo; 498 struct timeval tv; 499 struct bootpc_ifcontext *ifctx; 500 int outstanding; 501 int gotrootpath; 502 int retry; 503 const char *s; 504 505 tv.tv_sec = 1; 506 tv.tv_usec = 0; 507 bzero(&sopt, sizeof(sopt)); 508 sopt.sopt_dir = SOPT_SET; 509 sopt.sopt_level = SOL_SOCKET; 510 sopt.sopt_name = SO_RCVTIMEO; 511 sopt.sopt_val = &tv; 512 sopt.sopt_valsize = sizeof tv; 513 514 error = sosetopt(bootp_so, &sopt); 515 if (error != 0) 516 goto out; 517 518 /* 519 * Enable broadcast. 520 */ 521 on = 1; 522 sopt.sopt_name = SO_BROADCAST; 523 sopt.sopt_val = &on; 524 sopt.sopt_valsize = sizeof on; 525 526 error = sosetopt(bootp_so, &sopt); 527 if (error != 0) 528 goto out; 529 530 /* 531 * Disable routing. 532 */ 533 534 on = 1; 535 sopt.sopt_name = SO_DONTROUTE; 536 sopt.sopt_val = &on; 537 sopt.sopt_valsize = sizeof on; 538 539 error = sosetopt(bootp_so, &sopt); 540 if (error != 0) 541 goto out; 542 543 /* 544 * Bind the local endpoint to a bootp client port. 545 */ 546 sin = &dst; 547 clear_sinaddr(sin); 548 sin->sin_port = htons(IPPORT_BOOTPC); 549 error = sobind(bootp_so, (struct sockaddr *)sin, td); 550 if (error != 0) { 551 printf("bind failed\n"); 552 goto out; 553 } 554 555 /* 556 * Setup socket address for the server. 557 */ 558 sin = &dst; 559 clear_sinaddr(sin); 560 sin->sin_addr.s_addr = INADDR_BROADCAST; 561 sin->sin_port = htons(IPPORT_BOOTPS); 562 563 /* 564 * Send it, repeatedly, until a reply is received, 565 * but delay each re-send by an increasing amount. 566 * If the delay hits the maximum, start complaining. 567 */ 568 timo = 0; 569 rtimo = 0; 570 for (;;) { 571 outstanding = 0; 572 gotrootpath = 0; 573 574 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 575 if (bootpc_ifctx_isresolved(ifctx) != 0 && 576 bootpc_tag(&gctx->tmptag, &ifctx->reply, 577 ifctx->replylen, 578 TAG_ROOT) != NULL) 579 gotrootpath = 1; 580 } 581 582 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 583 struct in_aliasreq *ifra = &ifctx->iareq; 584 sin = (struct sockaddr_in *)&ifra->ifra_mask; 585 586 ifctx->outstanding = 0; 587 if (bootpc_ifctx_isresolved(ifctx) != 0 && 588 gotrootpath != 0) { 589 continue; 590 } 591 if (bootpc_ifctx_isfailed(ifctx) != 0) 592 continue; 593 594 outstanding++; 595 ifctx->outstanding = 1; 596 597 /* Proceed to next step in DHCP negotiation */ 598 if ((ifctx->state == IF_DHCP_OFFERED && 599 ifctx->dhcpquerytype != DHCP_REQUEST) || 600 (ifctx->state == IF_DHCP_UNRESOLVED && 601 ifctx->dhcpquerytype != DHCP_DISCOVER) || 602 (ifctx->state == IF_BOOTP_UNRESOLVED && 603 ifctx->dhcpquerytype != DHCP_NOMSG)) { 604 ifctx->sentmsg = 0; 605 bootpc_compose_query(ifctx, td); 606 } 607 608 /* Send BOOTP request (or re-send). */ 609 610 if (ifctx->sentmsg == 0) { 611 switch(ifctx->dhcpquerytype) { 612 case DHCP_DISCOVER: 613 s = "DHCP Discover"; 614 break; 615 case DHCP_REQUEST: 616 s = "DHCP Request"; 617 break; 618 case DHCP_NOMSG: 619 default: 620 s = "BOOTP Query"; 621 break; 622 } 623 printf("Sending %s packet from " 624 "interface %s (%*D)\n", 625 s, 626 ifctx->ireq.ifr_name, 627 ifctx->sdl->sdl_alen, 628 (unsigned char *) LLADDR(ifctx->sdl), 629 ":"); 630 ifctx->sentmsg = 1; 631 } 632 633 aio.iov_base = (caddr_t) &ifctx->call; 634 aio.iov_len = sizeof(ifctx->call); 635 636 auio.uio_iov = &aio; 637 auio.uio_iovcnt = 1; 638 auio.uio_segflg = UIO_SYSSPACE; 639 auio.uio_rw = UIO_WRITE; 640 auio.uio_offset = 0; 641 auio.uio_resid = sizeof(ifctx->call); 642 auio.uio_td = td; 643 644 /* Set netmask to 0.0.0.0 */ 645 clear_sinaddr(sin); 646 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 647 td); 648 if (error != 0) 649 panic("%s: SIOCAIFADDR, error=%d", __func__, 650 error); 651 652 error = sosend(bootp_so, (struct sockaddr *) &dst, 653 &auio, NULL, NULL, 0, td); 654 if (error != 0) 655 printf("%s: sosend: %d state %08x\n", __func__, 656 error, (int )bootp_so->so_state); 657 658 /* Set netmask to 255.0.0.0 */ 659 sin->sin_addr.s_addr = htonl(0xff000000); 660 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, 661 td); 662 if (error != 0) 663 panic("%s: SIOCAIFADDR, error=%d", __func__, 664 error); 665 } 666 667 if (outstanding == 0 && 668 (rtimo == 0 || time_second >= rtimo)) { 669 error = 0; 670 goto out; 671 } 672 673 /* Determine new timeout. */ 674 if (timo < MAX_RESEND_DELAY) 675 timo++; 676 else { 677 printf("DHCP/BOOTP timeout for server "); 678 print_sin_addr(&dst); 679 printf("\n"); 680 } 681 682 /* 683 * Wait for up to timo seconds for a reply. 684 * The socket receive timeout was set to 1 second. 685 */ 686 atimo = timo + time_second; 687 while (time_second < atimo) { 688 aio.iov_base = (caddr_t) &gctx->reply; 689 aio.iov_len = sizeof(gctx->reply); 690 691 auio.uio_iov = &aio; 692 auio.uio_iovcnt = 1; 693 auio.uio_segflg = UIO_SYSSPACE; 694 auio.uio_rw = UIO_READ; 695 auio.uio_offset = 0; 696 auio.uio_resid = sizeof(gctx->reply); 697 auio.uio_td = td; 698 699 rcvflg = 0; 700 error = soreceive(bootp_so, NULL, &auio, 701 NULL, NULL, &rcvflg); 702 gctx->secs = time_second - gctx->starttime; 703 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 704 if (bootpc_ifctx_isresolved(ifctx) != 0 || 705 bootpc_ifctx_isfailed(ifctx) != 0) 706 continue; 707 708 ifctx->call.secs = htons(gctx->secs); 709 } 710 if (error == EWOULDBLOCK) 711 continue; 712 if (error != 0) 713 goto out; 714 len = sizeof(gctx->reply) - auio.uio_resid; 715 716 /* Do we have the required number of bytes ? */ 717 if (len < BOOTP_MIN_LEN) 718 continue; 719 gctx->replylen = len; 720 721 /* Is it a reply? */ 722 if (gctx->reply.op != BOOTP_REPLY) 723 continue; 724 725 /* Is this an answer to our query */ 726 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) { 727 if (gctx->reply.xid != ifctx->call.xid) 728 continue; 729 730 /* Same HW address size ? */ 731 if (gctx->reply.hlen != ifctx->call.hlen) 732 continue; 733 734 /* Correct HW address ? */ 735 if (bcmp(gctx->reply.chaddr, 736 ifctx->call.chaddr, 737 ifctx->call.hlen) != 0) 738 continue; 739 740 break; 741 } 742 743 if (ifctx != NULL) { 744 s = bootpc_tag(&gctx->tmptag, 745 &gctx->reply, 746 gctx->replylen, 747 TAG_DHCP_MSGTYPE); 748 if (s != NULL) { 749 switch (*s) { 750 case DHCP_OFFER: 751 s = "DHCP Offer"; 752 break; 753 case DHCP_ACK: 754 s = "DHCP Ack"; 755 break; 756 default: 757 s = "DHCP (unexpected)"; 758 break; 759 } 760 } else 761 s = "BOOTP Reply"; 762 763 printf("Received %s packet" 764 " on %s from ", 765 s, 766 ifctx->ireq.ifr_name); 767 print_in_addr(gctx->reply.siaddr); 768 if (gctx->reply.giaddr.s_addr != 769 htonl(INADDR_ANY)) { 770 printf(" via "); 771 print_in_addr(gctx->reply.giaddr); 772 } 773 if (bootpc_received(gctx, ifctx) != 0) { 774 printf(" (accepted)"); 775 if (ifctx->outstanding) { 776 ifctx->outstanding = 0; 777 outstanding--; 778 } 779 /* Network settle delay */ 780 if (outstanding == 0) 781 atimo = time_second + 782 BOOTP_SETTLE_DELAY; 783 } else 784 printf(" (ignored)"); 785 if (ifctx->gotrootpath || 786 gctx->any_root_overrides) { 787 gotrootpath = 1; 788 rtimo = time_second + 789 BOOTP_SETTLE_DELAY; 790 if (ifctx->gotrootpath) 791 printf(" (got root path)"); 792 } 793 printf("\n"); 794 } 795 } /* while secs */ 796 #ifdef BOOTP_TIMEOUT 797 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0) 798 break; 799 #endif 800 /* Force a retry if halfway in DHCP negotiation */ 801 retry = 0; 802 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 803 if (ifctx->state == IF_DHCP_OFFERED) { 804 if (ifctx->dhcpquerytype == DHCP_DISCOVER) 805 retry = 1; 806 else 807 ifctx->state = IF_DHCP_UNRESOLVED; 808 } 809 810 if (retry != 0) 811 continue; 812 813 if (gotrootpath != 0) { 814 gctx->gotrootpath = gotrootpath; 815 if (rtimo != 0 && time_second >= rtimo) 816 break; 817 } 818 } /* forever send/receive */ 819 820 /* 821 * XXX: These are errors of varying seriousness being silently 822 * ignored 823 */ 824 825 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 826 if (bootpc_ifctx_isresolved(ifctx) == 0) { 827 printf("%s timeout for interface %s\n", 828 ifctx->dhcpquerytype != DHCP_NOMSG ? 829 "DHCP" : "BOOTP", 830 ifctx->ireq.ifr_name); 831 } 832 833 if (gctx->gotrootpath != 0) { 834 #if 0 835 printf("Got a root path, ignoring remaining timeout\n"); 836 #endif 837 error = 0; 838 goto out; 839 } 840 #ifndef BOOTP_NFSROOT 841 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 842 if (bootpc_ifctx_isresolved(ifctx) != 0) { 843 error = 0; 844 goto out; 845 } 846 #endif 847 error = ETIMEDOUT; 848 849 out: 850 return (error); 851 } 852 853 static void 854 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 855 { 856 struct ifreq *ifr; 857 struct in_aliasreq *ifra; 858 struct sockaddr_in *sin; 859 int error; 860 861 ifr = &ifctx->ireq; 862 ifra = &ifctx->iareq; 863 864 /* 865 * Bring up the interface. 866 * 867 * Get the old interface flags and or IFF_UP into them; if 868 * IFF_UP set blindly, interface selection can be clobbered. 869 */ 870 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 871 if (error != 0) 872 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 873 ifr->ifr_flags |= IFF_UP; 874 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 875 if (error != 0) 876 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 877 878 /* 879 * Do enough of ifconfig(8) so that the chosen interface 880 * can talk to the servers. Set address to 0.0.0.0/8 and 881 * broadcast address to local broadcast. 882 */ 883 sin = (struct sockaddr_in *)&ifra->ifra_addr; 884 clear_sinaddr(sin); 885 sin = (struct sockaddr_in *)&ifra->ifra_mask; 886 clear_sinaddr(sin); 887 sin->sin_addr.s_addr = htonl(0xff000000); 888 sin = (struct sockaddr_in *)&ifra->ifra_broadaddr; 889 clear_sinaddr(sin); 890 sin->sin_addr.s_addr = htonl(INADDR_BROADCAST); 891 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 892 if (error != 0) 893 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 894 } 895 896 static void 897 bootpc_shutdown_interface(struct bootpc_ifcontext *ifctx, struct thread *td) 898 { 899 struct ifreq *ifr; 900 struct sockaddr_in *sin; 901 int error; 902 903 ifr = &ifctx->ireq; 904 905 printf("Shutdown interface %s\n", ifctx->ireq.ifr_name); 906 error = ifioctl(bootp_so, SIOCGIFFLAGS, (caddr_t)ifr, td); 907 if (error != 0) 908 panic("%s: SIOCGIFFLAGS, error=%d", __func__, error); 909 ifr->ifr_flags &= ~IFF_UP; 910 error = ifioctl(bootp_so, SIOCSIFFLAGS, (caddr_t)ifr, td); 911 if (error != 0) 912 panic("%s: SIOCSIFFLAGS, error=%d", __func__, error); 913 914 sin = (struct sockaddr_in *) &ifr->ifr_addr; 915 clear_sinaddr(sin); 916 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 917 if (error != 0) 918 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 919 } 920 921 static void 922 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 923 struct bootpc_globalcontext *gctx, struct thread *td) 924 { 925 int error; 926 struct sockaddr_in *sin; 927 struct ifreq *ifr; 928 struct in_aliasreq *ifra; 929 struct sockaddr_in *myaddr; 930 struct sockaddr_in *netmask; 931 932 ifr = &ifctx->ireq; 933 ifra = &ifctx->iareq; 934 myaddr = &ifctx->myaddr; 935 netmask = &ifctx->netmask; 936 937 if (bootpc_ifctx_isresolved(ifctx) == 0) { 938 /* Shutdown interfaces where BOOTP failed */ 939 bootpc_shutdown_interface(ifctx, td); 940 return; 941 } 942 943 printf("Adjusted interface %s", ifctx->ireq.ifr_name); 944 945 /* Do BOOTP interface options */ 946 if (ifctx->mtu != 0) { 947 printf(" (MTU=%d%s)", ifctx->mtu, 948 (ifctx->mtu > 1514) ? "/JUMBO" : ""); 949 ifr->ifr_mtu = ifctx->mtu; 950 error = ifioctl(bootp_so, SIOCSIFMTU, (caddr_t) ifr, td); 951 if (error != 0) 952 panic("%s: SIOCSIFMTU, error=%d", __func__, error); 953 } 954 printf("\n"); 955 956 /* 957 * Do enough of ifconfig(8) so that the chosen interface 958 * can talk to the servers. (just set the address) 959 */ 960 sin = (struct sockaddr_in *) &ifr->ifr_addr; 961 clear_sinaddr(sin); 962 error = ifioctl(bootp_so, SIOCDIFADDR, (caddr_t) ifr, td); 963 if (error != 0) 964 panic("%s: SIOCDIFADDR, error=%d", __func__, error); 965 966 bcopy(myaddr, &ifra->ifra_addr, sizeof(*myaddr)); 967 bcopy(netmask, &ifra->ifra_mask, sizeof(*netmask)); 968 clear_sinaddr(&ifra->ifra_broadaddr); 969 ifra->ifra_broadaddr.sin_addr.s_addr = myaddr->sin_addr.s_addr | 970 ~netmask->sin_addr.s_addr; 971 972 error = ifioctl(bootp_so, SIOCAIFADDR, (caddr_t)ifra, td); 973 if (error != 0) 974 panic("%s: SIOCAIFADDR, error=%d", __func__, error); 975 } 976 977 static void 978 bootpc_add_default_route(struct bootpc_ifcontext *ifctx) 979 { 980 int error; 981 struct sockaddr_in defdst; 982 struct sockaddr_in defmask; 983 struct rt_addrinfo info; 984 struct rib_cmd_info rc; 985 986 if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY)) 987 return; 988 989 clear_sinaddr(&defdst); 990 clear_sinaddr(&defmask); 991 992 bzero((caddr_t)&info, sizeof(info)); 993 info.rti_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; 994 info.rti_info[RTAX_DST] = (struct sockaddr *)&defdst; 995 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&defmask; 996 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ifctx->gw; 997 998 error = rib_action(RT_DEFAULT_FIB, RTM_ADD, &info, &rc); 999 1000 if (error != 0) { 1001 printf("%s: RTM_ADD, error=%d\n", __func__, error); 1002 } 1003 } 1004 1005 static void 1006 bootpc_remove_default_route(struct bootpc_ifcontext *ifctx) 1007 { 1008 int error; 1009 struct sockaddr_in defdst; 1010 struct sockaddr_in defmask; 1011 struct rt_addrinfo info; 1012 struct rib_cmd_info rc; 1013 1014 if (ifctx->gw.sin_addr.s_addr == htonl(INADDR_ANY)) 1015 return; 1016 1017 clear_sinaddr(&defdst); 1018 clear_sinaddr(&defmask); 1019 1020 bzero((caddr_t)&info, sizeof(info)); 1021 info.rti_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; 1022 info.rti_info[RTAX_DST] = (struct sockaddr *)&defdst; 1023 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&defmask; 1024 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ifctx->gw; 1025 1026 error = rib_action(RT_DEFAULT_FIB, RTM_DELETE, &info, &rc); 1027 if (error != 0) { 1028 printf("%s: RTM_DELETE, error=%d\n", __func__, error); 1029 } 1030 } 1031 1032 static int 1033 setfs(struct sockaddr_in *addr, char *path, char *p, 1034 const struct in_addr *siaddr) 1035 { 1036 1037 if (getip(&p, &addr->sin_addr) == 0) { 1038 if (siaddr != NULL && *p == '/') 1039 bcopy(siaddr, &addr->sin_addr, sizeof(struct in_addr)); 1040 else 1041 return 0; 1042 } else { 1043 if (*p != ':') 1044 return 0; 1045 p++; 1046 } 1047 1048 addr->sin_len = sizeof(struct sockaddr_in); 1049 addr->sin_family = AF_INET; 1050 1051 strlcpy(path, p, MNAMELEN); 1052 return 1; 1053 } 1054 1055 static int 1056 getip(char **ptr, struct in_addr *addr) 1057 { 1058 char *p; 1059 unsigned int ip; 1060 int val; 1061 1062 p = *ptr; 1063 ip = 0; 1064 if (((val = getdec(&p)) < 0) || (val > 255)) 1065 return 0; 1066 ip = val << 24; 1067 if (*p != '.') 1068 return 0; 1069 p++; 1070 if (((val = getdec(&p)) < 0) || (val > 255)) 1071 return 0; 1072 ip |= (val << 16); 1073 if (*p != '.') 1074 return 0; 1075 p++; 1076 if (((val = getdec(&p)) < 0) || (val > 255)) 1077 return 0; 1078 ip |= (val << 8); 1079 if (*p != '.') 1080 return 0; 1081 p++; 1082 if (((val = getdec(&p)) < 0) || (val > 255)) 1083 return 0; 1084 ip |= val; 1085 1086 addr->s_addr = htonl(ip); 1087 *ptr = p; 1088 return 1; 1089 } 1090 1091 static int 1092 getdec(char **ptr) 1093 { 1094 char *p; 1095 int ret; 1096 1097 p = *ptr; 1098 ret = 0; 1099 if ((*p < '') || (*p > '9')) 1100 return -1; 1101 while ((*p >= '') && (*p <= '9')) { 1102 ret = ret * 10 + (*p - ''); 1103 p++; 1104 } 1105 *ptr = p; 1106 return ret; 1107 } 1108 1109 static void 1110 mountopts(struct nfs_args *args, char *p) 1111 { 1112 args->version = NFS_ARGSVERSION; 1113 args->rsize = BOOTP_BLOCKSIZE; 1114 args->wsize = BOOTP_BLOCKSIZE; 1115 args->flags = NFSMNT_RSIZE | NFSMNT_WSIZE | NFSMNT_RESVPORT; 1116 args->sotype = SOCK_DGRAM; 1117 if (p != NULL) 1118 nfs_parse_options(p, args); 1119 } 1120 1121 static int 1122 xdr_opaque_decode(struct mbuf **mptr, u_char *buf, int len) 1123 { 1124 struct mbuf *m; 1125 int alignedlen; 1126 1127 m = *mptr; 1128 alignedlen = ( len + 3 ) & ~3; 1129 1130 if (m->m_len < alignedlen) { 1131 m = m_pullup(m, alignedlen); 1132 if (m == NULL) { 1133 *mptr = NULL; 1134 return EBADRPC; 1135 } 1136 } 1137 bcopy(mtod(m, u_char *), buf, len); 1138 m_adj(m, alignedlen); 1139 *mptr = m; 1140 return 0; 1141 } 1142 1143 static int 1144 xdr_int_decode(struct mbuf **mptr, int *iptr) 1145 { 1146 u_int32_t i; 1147 1148 if (xdr_opaque_decode(mptr, (u_char *) &i, sizeof(u_int32_t)) != 0) 1149 return EBADRPC; 1150 *iptr = fxdr_unsigned(u_int32_t, i); 1151 return 0; 1152 } 1153 1154 static void 1155 print_sin_addr(struct sockaddr_in *sin) 1156 { 1157 1158 print_in_addr(sin->sin_addr); 1159 } 1160 1161 static void 1162 print_in_addr(struct in_addr addr) 1163 { 1164 unsigned int ip; 1165 1166 ip = ntohl(addr.s_addr); 1167 printf("%d.%d.%d.%d", 1168 ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); 1169 } 1170 1171 static void 1172 bootpc_compose_query(struct bootpc_ifcontext *ifctx, struct thread *td) 1173 { 1174 unsigned char *vendp; 1175 unsigned char vendor_client[64]; 1176 uint32_t leasetime; 1177 uint8_t vendor_client_len; 1178 1179 ifctx->gotrootpath = 0; 1180 1181 bzero((caddr_t) &ifctx->call, sizeof(ifctx->call)); 1182 1183 /* bootpc part */ 1184 ifctx->call.op = BOOTP_REQUEST; /* BOOTREQUEST */ 1185 ifctx->call.htype = 1; /* 10mb ethernet */ 1186 ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */ 1187 ifctx->call.hops = 0; 1188 if (bootpc_ifctx_isunresolved(ifctx) != 0) 1189 ifctx->xid++; 1190 ifctx->call.xid = txdr_unsigned(ifctx->xid); 1191 bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen); 1192 1193 vendp = ifctx->call.vend; 1194 *vendp++ = 99; /* RFC1048 cookie */ 1195 *vendp++ = 130; 1196 *vendp++ = 83; 1197 *vendp++ = 99; 1198 *vendp++ = TAG_MAXMSGSIZE; 1199 *vendp++ = 2; 1200 *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255; 1201 *vendp++ = sizeof(struct bootp_packet) & 255; 1202 1203 snprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s", 1204 ostype, MACHINE, osrelease); 1205 vendor_client_len = strlen(vendor_client); 1206 *vendp++ = TAG_VENDOR_INDENTIFIER; 1207 *vendp++ = vendor_client_len; 1208 memcpy(vendp, vendor_client, vendor_client_len); 1209 vendp += vendor_client_len; 1210 ifctx->dhcpquerytype = DHCP_NOMSG; 1211 switch (ifctx->state) { 1212 case IF_DHCP_UNRESOLVED: 1213 *vendp++ = TAG_DHCP_MSGTYPE; 1214 *vendp++ = 1; 1215 *vendp++ = DHCP_DISCOVER; 1216 ifctx->dhcpquerytype = DHCP_DISCOVER; 1217 ifctx->gotdhcpserver = 0; 1218 break; 1219 case IF_DHCP_OFFERED: 1220 *vendp++ = TAG_DHCP_MSGTYPE; 1221 *vendp++ = 1; 1222 *vendp++ = DHCP_REQUEST; 1223 ifctx->dhcpquerytype = DHCP_REQUEST; 1224 *vendp++ = TAG_DHCP_REQ_ADDR; 1225 *vendp++ = 4; 1226 memcpy(vendp, &ifctx->reply.yiaddr, 4); 1227 vendp += 4; 1228 if (ifctx->gotdhcpserver != 0) { 1229 *vendp++ = TAG_DHCP_SERVERID; 1230 *vendp++ = 4; 1231 memcpy(vendp, &ifctx->dhcpserver, 4); 1232 vendp += 4; 1233 } 1234 *vendp++ = TAG_DHCP_LEASETIME; 1235 *vendp++ = 4; 1236 leasetime = htonl(300); 1237 memcpy(vendp, &leasetime, 4); 1238 vendp += 4; 1239 break; 1240 default: 1241 break; 1242 } 1243 *vendp = TAG_END; 1244 1245 ifctx->call.secs = 0; 1246 ifctx->call.flags = htons(0x8000); /* We need a broadcast answer */ 1247 } 1248 1249 static int 1250 bootpc_hascookie(struct bootp_packet *bp) 1251 { 1252 1253 return (bp->vend[0] == 99 && bp->vend[1] == 130 && 1254 bp->vend[2] == 83 && bp->vend[3] == 99); 1255 } 1256 1257 static void 1258 bootpc_tag_helper(struct bootpc_tagcontext *tctx, 1259 unsigned char *start, int len, int tag) 1260 { 1261 unsigned char *j; 1262 unsigned char *ej; 1263 unsigned char code; 1264 1265 if (tctx->badtag != 0 || tctx->badopt != 0) 1266 return; 1267 1268 j = start; 1269 ej = j + len; 1270 1271 while (j < ej) { 1272 code = *j++; 1273 if (code == TAG_PAD) 1274 continue; 1275 if (code == TAG_END) 1276 return; 1277 if (j >= ej || j + *j + 1 > ej) { 1278 tctx->badopt = 1; 1279 return; 1280 } 1281 len = *j++; 1282 if (code == tag) { 1283 if (tctx->taglen + len > TAG_MAXLEN) { 1284 tctx->badtag = 1; 1285 return; 1286 } 1287 tctx->foundopt = 1; 1288 if (len > 0) 1289 memcpy(tctx->buf + tctx->taglen, 1290 j, len); 1291 tctx->taglen += len; 1292 } 1293 if (code == TAG_OVERLOAD) 1294 tctx->overload = *j; 1295 1296 j += len; 1297 } 1298 } 1299 1300 static unsigned char * 1301 bootpc_tag(struct bootpc_tagcontext *tctx, 1302 struct bootp_packet *bp, int len, int tag) 1303 { 1304 tctx->overload = 0; 1305 tctx->badopt = 0; 1306 tctx->badtag = 0; 1307 tctx->foundopt = 0; 1308 tctx->taglen = 0; 1309 1310 if (bootpc_hascookie(bp) == 0) 1311 return NULL; 1312 1313 bootpc_tag_helper(tctx, &bp->vend[4], 1314 (unsigned char *) bp + len - &bp->vend[4], tag); 1315 1316 if ((tctx->overload & OVERLOAD_FILE) != 0) 1317 bootpc_tag_helper(tctx, 1318 (unsigned char *) bp->file, 1319 sizeof(bp->file), 1320 tag); 1321 if ((tctx->overload & OVERLOAD_SNAME) != 0) 1322 bootpc_tag_helper(tctx, 1323 (unsigned char *) bp->sname, 1324 sizeof(bp->sname), 1325 tag); 1326 1327 if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0) 1328 return NULL; 1329 tctx->buf[tctx->taglen] = '\0'; 1330 return tctx->buf; 1331 } 1332 1333 static void 1334 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx, 1335 struct bootpc_globalcontext *gctx) 1336 { 1337 char *p, *s; 1338 1339 ifctx->gotgw = 0; 1340 ifctx->gotnetmask = 0; 1341 1342 clear_sinaddr(&ifctx->myaddr); 1343 clear_sinaddr(&ifctx->netmask); 1344 clear_sinaddr(&ifctx->gw); 1345 1346 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1347 1348 printf("%s at ", ifctx->ireq.ifr_name); 1349 print_sin_addr(&ifctx->myaddr); 1350 printf(" server "); 1351 print_in_addr(ifctx->reply.siaddr); 1352 1353 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1354 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1355 printf(" via gateway "); 1356 print_in_addr(ifctx->reply.giaddr); 1357 } 1358 1359 /* This call used for the side effect (overload flag) */ 1360 (void) bootpc_tag(&gctx->tmptag, 1361 &ifctx->reply, ifctx->replylen, TAG_END); 1362 1363 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1364 if (ifctx->reply.sname[0] != '\0') 1365 printf(" server name %s", ifctx->reply.sname); 1366 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1367 if (ifctx->reply.file[0] != '\0') 1368 printf(" boot file %s", ifctx->reply.file); 1369 1370 printf("\n"); 1371 1372 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1373 TAG_SUBNETMASK); 1374 if (p != NULL) { 1375 if (gctx->tag.taglen != 4) 1376 panic("bootpc: subnet mask len is %d", 1377 gctx->tag.taglen); 1378 bcopy(p, &ifctx->netmask.sin_addr, 4); 1379 ifctx->gotnetmask = 1; 1380 printf("subnet mask "); 1381 print_sin_addr(&ifctx->netmask); 1382 printf(" "); 1383 } 1384 1385 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1386 TAG_ROUTERS); 1387 if (p != NULL) { 1388 /* Routers */ 1389 if (gctx->tag.taglen % 4) 1390 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1391 if (gctx->tag.taglen > 0) { 1392 bcopy(p, &ifctx->gw.sin_addr, 4); 1393 printf("router "); 1394 print_sin_addr(&ifctx->gw); 1395 printf(" "); 1396 ifctx->gotgw = 1; 1397 gctx->gotgw = 1; 1398 } 1399 } 1400 1401 /* 1402 * Choose a root filesystem. If a value is forced in the environment 1403 * and it contains "nfs:", use it unconditionally. Otherwise, if the 1404 * kernel is compiled with the ROOTDEVNAME option, then use it if: 1405 * - The server doesn't provide a pathname. 1406 * - The boothowto flags include RB_DFLTROOT (user said to override 1407 * the server value). 1408 */ 1409 p = NULL; 1410 if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) { 1411 if ((p = strstr(s, "nfs:")) != NULL) 1412 p = strdup(p + 4, M_TEMP); 1413 freeenv(s); 1414 } 1415 if (p == NULL) { 1416 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1417 TAG_ROOT); 1418 if (p != NULL) 1419 ifctx->gotrootpath = 1; 1420 } 1421 #ifdef ROOTDEVNAME 1422 if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) && 1423 (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) { 1424 p += 4; 1425 } 1426 #endif 1427 if (p != NULL) { 1428 if (gctx->setrootfs != NULL) { 1429 printf("rootfs %s (ignored) ", p); 1430 } else if (setfs(&nd->root_saddr, 1431 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1432 if (*p == '/') { 1433 printf("root_server "); 1434 print_sin_addr(&nd->root_saddr); 1435 printf(" "); 1436 } 1437 printf("rootfs %s ", p); 1438 gctx->gotrootpath = 1; 1439 gctx->setrootfs = ifctx; 1440 1441 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1442 ifctx->replylen, 1443 TAG_ROOTOPTS); 1444 if (p != NULL) { 1445 mountopts(&nd->root_args, p); 1446 printf("rootopts %s ", p); 1447 } 1448 } else 1449 panic("Failed to set rootfs to %s", p); 1450 } 1451 1452 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1453 TAG_HOSTNAME); 1454 if (p != NULL) { 1455 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1456 panic("bootpc: hostname >= %d bytes", 1457 MAXHOSTNAMELEN); 1458 if (gctx->sethostname != NULL) { 1459 printf("hostname %s (ignored) ", p); 1460 } else { 1461 strcpy(nd->my_hostnam, p); 1462 mtx_lock(&prison0.pr_mtx); 1463 strcpy(prison0.pr_hostname, p); 1464 mtx_unlock(&prison0.pr_mtx); 1465 printf("hostname %s ", p); 1466 gctx->sethostname = ifctx; 1467 } 1468 } 1469 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1470 TAG_COOKIE); 1471 if (p != NULL) { /* store in a sysctl variable */ 1472 int i, l = sizeof(bootp_cookie) - 1; 1473 for (i = 0; i < l && p[i] != '\0'; i++) 1474 bootp_cookie[i] = p[i]; 1475 p[i] = '\0'; 1476 } 1477 1478 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1479 TAG_INTF_MTU); 1480 if (p != NULL) { 1481 ifctx->mtu = be16dec(p); 1482 } 1483 1484 printf("\n"); 1485 1486 if (ifctx->gotnetmask == 0) { 1487 /* 1488 * If there is no netmask, use historical default, 1489 * but we really need the right mask from the server. 1490 */ 1491 printf("%s: no netmask received!\n", ifctx->ireq.ifr_name); 1492 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1493 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1494 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1495 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1496 else 1497 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1498 } 1499 } 1500 1501 void 1502 bootpc_init(void) 1503 { 1504 struct bootpc_ifcontext *ifctx = NULL; /* Interface BOOTP contexts */ 1505 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1506 struct ifnet *ifp; 1507 struct sockaddr_dl *sdl; 1508 struct ifaddr *ifa; 1509 int error; 1510 #ifndef BOOTP_WIRED_TO 1511 int ifcnt; 1512 #endif 1513 struct nfsv3_diskless *nd; 1514 struct thread *td; 1515 int timeout; 1516 int delay; 1517 char *s; 1518 1519 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz; 1520 delay = hz / 10; 1521 1522 nd = &nfsv3_diskless; 1523 td = curthread; 1524 1525 /* 1526 * If already filled in, don't touch it here 1527 */ 1528 if (nfs_diskless_valid != 0) 1529 return; 1530 1531 /* 1532 * If "vfs.root.mountfrom" is set and the value is something other 1533 * than "nfs:", it means the user doesn't want to mount root via nfs, 1534 * there's no reason to continue with bootpc 1535 */ 1536 if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) { 1537 if ((strncmp(s, "nfs:", 4)) != 0) { 1538 printf("%s: vfs.root.mountfrom set to %s. " 1539 "BOOTP aborted.\n", __func__, s); 1540 freeenv(s); 1541 return; 1542 } 1543 freeenv(s); 1544 } 1545 1546 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1547 STAILQ_INIT(&gctx->interfaces); 1548 gctx->xid = ~0xFFFF; 1549 gctx->starttime = time_second; 1550 1551 /* 1552 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have 1553 * root-path overrides that can potentially let us boot even if we don't 1554 * get a root path from the server, so we can treat that as a non-error. 1555 */ 1556 #ifdef ROOTDEVNAME 1557 gctx->any_root_overrides = 1; 1558 #else 1559 gctx->any_root_overrides = testenv("vfs.root.mountfrom"); 1560 #endif 1561 1562 /* 1563 * Find a network interface. 1564 */ 1565 CURVNET_SET(TD_TO_VNET(td)); 1566 #ifdef BOOTP_WIRED_TO 1567 printf("%s: wired to interface '%s'\n", __func__, 1568 __XSTRING(BOOTP_WIRED_TO)); 1569 allocifctx(gctx); 1570 #else 1571 /* 1572 * Preallocate interface context storage, if another interface 1573 * attaches and wins the race, it won't be eligible for bootp. 1574 */ 1575 ifcnt = 0; 1576 IFNET_RLOCK(); 1577 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1578 if ((ifp->if_flags & 1579 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1580 IFF_BROADCAST) 1581 continue; 1582 switch (ifp->if_alloctype) { 1583 case IFT_ETHER: 1584 break; 1585 default: 1586 continue; 1587 } 1588 ifcnt++; 1589 } 1590 1591 IFNET_RUNLOCK(); 1592 if (ifcnt == 0) { 1593 printf("WARNING: BOOTP found no eligible network interfaces, skipping!\n"); 1594 goto out; 1595 } 1596 1597 for (; ifcnt > 0; ifcnt--) 1598 allocifctx(gctx); 1599 #endif 1600 1601 retry: 1602 ifctx = STAILQ_FIRST(&gctx->interfaces); 1603 IFNET_RLOCK(); 1604 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1605 if (ifctx == NULL) 1606 break; 1607 #ifdef BOOTP_WIRED_TO 1608 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0) 1609 continue; 1610 #else 1611 if ((ifp->if_flags & 1612 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1613 IFF_BROADCAST) 1614 continue; 1615 switch (ifp->if_alloctype) { 1616 case IFT_ETHER: 1617 break; 1618 default: 1619 continue; 1620 } 1621 #endif 1622 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1623 sizeof(ifctx->ireq.ifr_name)); 1624 ifctx->ifp = ifp; 1625 1626 /* Get HW address */ 1627 sdl = NULL; 1628 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1629 if (ifa->ifa_addr->sa_family == AF_LINK) { 1630 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1631 if (sdl->sdl_type == IFT_ETHER) 1632 break; 1633 } 1634 if (sdl == NULL) 1635 panic("bootpc: Unable to find HW address for %s", 1636 ifctx->ireq.ifr_name); 1637 ifctx->sdl = sdl; 1638 1639 ifctx = STAILQ_NEXT(ifctx, next); 1640 } 1641 IFNET_RUNLOCK(); 1642 CURVNET_RESTORE(); 1643 1644 if (STAILQ_EMPTY(&gctx->interfaces) || 1645 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) { 1646 if (timeout > 0) { 1647 pause("bootpc", delay); 1648 timeout -= delay; 1649 goto retry; 1650 } 1651 #ifdef BOOTP_WIRED_TO 1652 panic("%s: Could not find interface specified " 1653 "by BOOTP_WIRED_TO: " 1654 __XSTRING(BOOTP_WIRED_TO), __func__); 1655 #else 1656 panic("%s: no suitable interface", __func__); 1657 #endif 1658 } 1659 1660 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td); 1661 if (error != 0) 1662 panic("%s: socreate, error=%d", __func__, error); 1663 1664 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1665 bootpc_fakeup_interface(ifctx, td); 1666 1667 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1668 bootpc_compose_query(ifctx, td); 1669 1670 error = bootpc_call(gctx, td); 1671 if (error != 0) { 1672 printf("BOOTP call failed\n"); 1673 } 1674 1675 mountopts(&nd->root_args, NULL); 1676 1677 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1678 if (bootpc_ifctx_isresolved(ifctx) != 0) 1679 bootpc_decode_reply(nd, ifctx, gctx); 1680 1681 #ifdef BOOTP_NFSROOT 1682 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0) 1683 panic("bootpc: No root path offered"); 1684 #endif 1685 1686 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1687 bootpc_adjust_interface(ifctx, gctx, td); 1688 1689 soclose(bootp_so); 1690 1691 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1692 if (ifctx->gotrootpath != 0) 1693 break; 1694 if (ifctx == NULL) { 1695 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1696 if (bootpc_ifctx_isresolved(ifctx) != 0) 1697 break; 1698 } 1699 if (ifctx == NULL) 1700 goto out; 1701 1702 if (gctx->gotrootpath != 0) { 1703 struct epoch_tracker et; 1704 1705 kern_setenv("boot.netif.name", ifctx->ifp->if_xname); 1706 1707 NET_EPOCH_ENTER(et); 1708 bootpc_add_default_route(ifctx); 1709 NET_EPOCH_EXIT(et); 1710 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1711 nd->root_fh, &nd->root_fhsize, 1712 &nd->root_args, td); 1713 NET_EPOCH_ENTER(et); 1714 bootpc_remove_default_route(ifctx); 1715 NET_EPOCH_EXIT(et); 1716 if (error != 0) { 1717 if (gctx->any_root_overrides == 0) 1718 panic("nfs_boot: mount root, error=%d", error); 1719 else 1720 goto out; 1721 } 1722 rootdevnames[0] = "nfs:"; 1723 nfs_diskless_valid = 3; 1724 } 1725 1726 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1727 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1728 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1729 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1730 ifctx->myaddr.sin_addr.s_addr | 1731 ~ ifctx->netmask.sin_addr.s_addr; 1732 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1733 bcopy(&ifctx->gw, &nd->mygateway, sizeof(ifctx->gw)); 1734 1735 out: 1736 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) { 1737 STAILQ_REMOVE_HEAD(&gctx->interfaces, next); 1738 free(ifctx, M_TEMP); 1739 } 1740 free(gctx, M_TEMP); 1741 } 1742 1743 /* 1744 * RPC: mountd/mount 1745 * Given a server pathname, get an NFS file handle. 1746 * Also, sets sin->sin_port to the NFS service port. 1747 */ 1748 static int 1749 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1750 struct nfs_args *args, struct thread *td) 1751 { 1752 struct mbuf *m; 1753 int error; 1754 int authunixok; 1755 int authcount; 1756 int authver; 1757 1758 #define RPCPROG_MNT 100005 1759 #define RPCMNT_VER1 1 1760 #define RPCMNT_VER3 3 1761 #define RPCMNT_MOUNT 1 1762 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1763 #define AUTH_UNIX AUTH_SYS 1764 1765 /* XXX honor v2/v3 flags in args->flags? */ 1766 #ifdef BOOTP_NFSV3 1767 /* First try NFS v3 */ 1768 /* Get port number for MOUNTD. */ 1769 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1770 &mdsin->sin_port, td); 1771 if (error == 0) { 1772 m = xdr_string_encode(path, strlen(path)); 1773 1774 /* Do RPC to mountd. */ 1775 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1776 RPCMNT_MOUNT, &m, NULL, td); 1777 } 1778 if (error == 0) { 1779 args->flags |= NFSMNT_NFSV3; 1780 } else { 1781 #endif 1782 /* Fallback to NFS v2 */ 1783 1784 /* Get port number for MOUNTD. */ 1785 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1786 &mdsin->sin_port, td); 1787 if (error != 0) 1788 return error; 1789 1790 m = xdr_string_encode(path, strlen(path)); 1791 1792 /* Do RPC to mountd. */ 1793 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1794 RPCMNT_MOUNT, &m, NULL, td); 1795 if (error != 0) 1796 return error; /* message already freed */ 1797 1798 #ifdef BOOTP_NFSV3 1799 } 1800 #endif 1801 1802 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1803 goto bad; 1804 1805 if ((args->flags & NFSMNT_NFSV3) != 0) { 1806 if (xdr_int_decode(&m, fhsizep) != 0 || 1807 *fhsizep > NFSX_V3FHMAX || 1808 *fhsizep <= 0) 1809 goto bad; 1810 } else 1811 *fhsizep = NFSX_V2FH; 1812 1813 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1814 goto bad; 1815 1816 if (args->flags & NFSMNT_NFSV3) { 1817 if (xdr_int_decode(&m, &authcount) != 0) 1818 goto bad; 1819 authunixok = 0; 1820 if (authcount < 0 || authcount > 100) 1821 goto bad; 1822 while (authcount > 0) { 1823 if (xdr_int_decode(&m, &authver) != 0) 1824 goto bad; 1825 if (authver == AUTH_UNIX) 1826 authunixok = 1; 1827 authcount--; 1828 } 1829 if (authunixok == 0) 1830 goto bad; 1831 } 1832 1833 /* Set port number for NFS use. */ 1834 error = krpc_portmap(mdsin, NFS_PROG, 1835 (args->flags & 1836 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1837 &mdsin->sin_port, td); 1838 1839 goto out; 1840 1841 bad: 1842 error = EBADRPC; 1843 1844 out: 1845 m_freem(m); 1846 return error; 1847 } 1848 1849 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL);
Cache object: 7900e1b0e6d2c947afb022fb781dc5f8
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