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 < '0') || (*p > '9')) 1100 return -1; 1101 while ((*p >= '0') && (*p <= '9')) { 1102 ret = ret * 10 + (*p - '0'); 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 unsigned int ip; 1339 1340 ifctx->gotgw = 0; 1341 ifctx->gotnetmask = 0; 1342 1343 clear_sinaddr(&ifctx->myaddr); 1344 clear_sinaddr(&ifctx->netmask); 1345 clear_sinaddr(&ifctx->gw); 1346 1347 ifctx->myaddr.sin_addr = ifctx->reply.yiaddr; 1348 1349 ip = ntohl(ifctx->myaddr.sin_addr.s_addr); 1350 1351 printf("%s at ", ifctx->ireq.ifr_name); 1352 print_sin_addr(&ifctx->myaddr); 1353 printf(" server "); 1354 print_in_addr(ifctx->reply.siaddr); 1355 1356 ifctx->gw.sin_addr = ifctx->reply.giaddr; 1357 if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) { 1358 printf(" via gateway "); 1359 print_in_addr(ifctx->reply.giaddr); 1360 } 1361 1362 /* This call used for the side effect (overload flag) */ 1363 (void) bootpc_tag(&gctx->tmptag, 1364 &ifctx->reply, ifctx->replylen, TAG_END); 1365 1366 if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0) 1367 if (ifctx->reply.sname[0] != '\0') 1368 printf(" server name %s", ifctx->reply.sname); 1369 if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0) 1370 if (ifctx->reply.file[0] != '\0') 1371 printf(" boot file %s", ifctx->reply.file); 1372 1373 printf("\n"); 1374 1375 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1376 TAG_SUBNETMASK); 1377 if (p != NULL) { 1378 if (gctx->tag.taglen != 4) 1379 panic("bootpc: subnet mask len is %d", 1380 gctx->tag.taglen); 1381 bcopy(p, &ifctx->netmask.sin_addr, 4); 1382 ifctx->gotnetmask = 1; 1383 printf("subnet mask "); 1384 print_sin_addr(&ifctx->netmask); 1385 printf(" "); 1386 } 1387 1388 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1389 TAG_ROUTERS); 1390 if (p != NULL) { 1391 /* Routers */ 1392 if (gctx->tag.taglen % 4) 1393 panic("bootpc: Router Len is %d", gctx->tag.taglen); 1394 if (gctx->tag.taglen > 0) { 1395 bcopy(p, &ifctx->gw.sin_addr, 4); 1396 printf("router "); 1397 print_sin_addr(&ifctx->gw); 1398 printf(" "); 1399 ifctx->gotgw = 1; 1400 gctx->gotgw = 1; 1401 } 1402 } 1403 1404 /* 1405 * Choose a root filesystem. If a value is forced in the environment 1406 * and it contains "nfs:", use it unconditionally. Otherwise, if the 1407 * kernel is compiled with the ROOTDEVNAME option, then use it if: 1408 * - The server doesn't provide a pathname. 1409 * - The boothowto flags include RB_DFLTROOT (user said to override 1410 * the server value). 1411 */ 1412 p = NULL; 1413 if ((s = kern_getenv("vfs.root.mountfrom")) != NULL) { 1414 if ((p = strstr(s, "nfs:")) != NULL) 1415 p = strdup(p + 4, M_TEMP); 1416 freeenv(s); 1417 } 1418 if (p == NULL) { 1419 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1420 TAG_ROOT); 1421 if (p != NULL) 1422 ifctx->gotrootpath = 1; 1423 } 1424 #ifdef ROOTDEVNAME 1425 if ((p == NULL || (boothowto & RB_DFLTROOT) != 0) && 1426 (p = strstr(ROOTDEVNAME, "nfs:")) != NULL) { 1427 p += 4; 1428 } 1429 #endif 1430 if (p != NULL) { 1431 if (gctx->setrootfs != NULL) { 1432 printf("rootfs %s (ignored) ", p); 1433 } else if (setfs(&nd->root_saddr, 1434 nd->root_hostnam, p, &ifctx->reply.siaddr)) { 1435 if (*p == '/') { 1436 printf("root_server "); 1437 print_sin_addr(&nd->root_saddr); 1438 printf(" "); 1439 } 1440 printf("rootfs %s ", p); 1441 gctx->gotrootpath = 1; 1442 gctx->setrootfs = ifctx; 1443 1444 p = bootpc_tag(&gctx->tag, &ifctx->reply, 1445 ifctx->replylen, 1446 TAG_ROOTOPTS); 1447 if (p != NULL) { 1448 mountopts(&nd->root_args, p); 1449 printf("rootopts %s ", p); 1450 } 1451 } else 1452 panic("Failed to set rootfs to %s", p); 1453 } 1454 1455 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1456 TAG_HOSTNAME); 1457 if (p != NULL) { 1458 if (gctx->tag.taglen >= MAXHOSTNAMELEN) 1459 panic("bootpc: hostname >= %d bytes", 1460 MAXHOSTNAMELEN); 1461 if (gctx->sethostname != NULL) { 1462 printf("hostname %s (ignored) ", p); 1463 } else { 1464 strcpy(nd->my_hostnam, p); 1465 mtx_lock(&prison0.pr_mtx); 1466 strcpy(prison0.pr_hostname, p); 1467 mtx_unlock(&prison0.pr_mtx); 1468 printf("hostname %s ", p); 1469 gctx->sethostname = ifctx; 1470 } 1471 } 1472 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1473 TAG_COOKIE); 1474 if (p != NULL) { /* store in a sysctl variable */ 1475 int i, l = sizeof(bootp_cookie) - 1; 1476 for (i = 0; i < l && p[i] != '\0'; i++) 1477 bootp_cookie[i] = p[i]; 1478 p[i] = '\0'; 1479 } 1480 1481 p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen, 1482 TAG_INTF_MTU); 1483 if (p != NULL) { 1484 ifctx->mtu = be16dec(p); 1485 } 1486 1487 printf("\n"); 1488 1489 if (ifctx->gotnetmask == 0) { 1490 /* 1491 * If there is no netmask, use historical default, 1492 * but we really need the right mask from the server. 1493 */ 1494 printf("%s: no netmask received!\n", ifctx->ireq.ifr_name); 1495 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1496 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1497 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1498 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1499 else 1500 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1501 } 1502 } 1503 1504 void 1505 bootpc_init(void) 1506 { 1507 struct bootpc_ifcontext *ifctx; /* Interface BOOTP contexts */ 1508 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1509 struct ifnet *ifp; 1510 struct sockaddr_dl *sdl; 1511 struct ifaddr *ifa; 1512 int error; 1513 #ifndef BOOTP_WIRED_TO 1514 int ifcnt; 1515 #endif 1516 struct nfsv3_diskless *nd; 1517 struct thread *td; 1518 int timeout; 1519 int delay; 1520 1521 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz; 1522 delay = hz / 10; 1523 1524 nd = &nfsv3_diskless; 1525 td = curthread; 1526 1527 /* 1528 * If already filled in, don't touch it here 1529 */ 1530 if (nfs_diskless_valid != 0) 1531 return; 1532 1533 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1534 STAILQ_INIT(&gctx->interfaces); 1535 gctx->xid = ~0xFFFF; 1536 gctx->starttime = time_second; 1537 1538 /* 1539 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have 1540 * root-path overrides that can potentially let us boot even if we don't 1541 * get a root path from the server, so we can treat that as a non-error. 1542 */ 1543 #ifdef ROOTDEVNAME 1544 gctx->any_root_overrides = 1; 1545 #else 1546 gctx->any_root_overrides = testenv("vfs.root.mountfrom"); 1547 #endif 1548 1549 /* 1550 * Find a network interface. 1551 */ 1552 CURVNET_SET(TD_TO_VNET(td)); 1553 #ifdef BOOTP_WIRED_TO 1554 printf("%s: wired to interface '%s'\n", __func__, 1555 __XSTRING(BOOTP_WIRED_TO)); 1556 allocifctx(gctx); 1557 #else 1558 /* 1559 * Preallocate interface context storage, if another interface 1560 * attaches and wins the race, it won't be eligible for bootp. 1561 */ 1562 ifcnt = 0; 1563 IFNET_RLOCK(); 1564 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1565 if ((ifp->if_flags & 1566 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1567 IFF_BROADCAST) 1568 continue; 1569 switch (ifp->if_alloctype) { 1570 case IFT_ETHER: 1571 break; 1572 default: 1573 continue; 1574 } 1575 ifcnt++; 1576 } 1577 IFNET_RUNLOCK(); 1578 if (ifcnt == 0) 1579 panic("%s: no eligible interfaces", __func__); 1580 for (; ifcnt > 0; ifcnt--) 1581 allocifctx(gctx); 1582 #endif 1583 1584 retry: 1585 ifctx = STAILQ_FIRST(&gctx->interfaces); 1586 IFNET_RLOCK(); 1587 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1588 if (ifctx == NULL) 1589 break; 1590 #ifdef BOOTP_WIRED_TO 1591 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0) 1592 continue; 1593 #else 1594 if ((ifp->if_flags & 1595 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1596 IFF_BROADCAST) 1597 continue; 1598 switch (ifp->if_alloctype) { 1599 case IFT_ETHER: 1600 break; 1601 default: 1602 continue; 1603 } 1604 #endif 1605 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1606 sizeof(ifctx->ireq.ifr_name)); 1607 ifctx->ifp = ifp; 1608 1609 /* Get HW address */ 1610 sdl = NULL; 1611 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1612 if (ifa->ifa_addr->sa_family == AF_LINK) { 1613 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1614 if (sdl->sdl_type == IFT_ETHER) 1615 break; 1616 } 1617 if (sdl == NULL) 1618 panic("bootpc: Unable to find HW address for %s", 1619 ifctx->ireq.ifr_name); 1620 ifctx->sdl = sdl; 1621 1622 ifctx = STAILQ_NEXT(ifctx, next); 1623 } 1624 IFNET_RUNLOCK(); 1625 CURVNET_RESTORE(); 1626 1627 if (STAILQ_EMPTY(&gctx->interfaces) || 1628 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) { 1629 if (timeout > 0) { 1630 pause("bootpc", delay); 1631 timeout -= delay; 1632 goto retry; 1633 } 1634 #ifdef BOOTP_WIRED_TO 1635 panic("%s: Could not find interface specified " 1636 "by BOOTP_WIRED_TO: " 1637 __XSTRING(BOOTP_WIRED_TO), __func__); 1638 #else 1639 panic("%s: no suitable interface", __func__); 1640 #endif 1641 } 1642 1643 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td); 1644 if (error != 0) 1645 panic("%s: socreate, error=%d", __func__, error); 1646 1647 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1648 bootpc_fakeup_interface(ifctx, td); 1649 1650 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1651 bootpc_compose_query(ifctx, td); 1652 1653 error = bootpc_call(gctx, td); 1654 if (error != 0) { 1655 printf("BOOTP call failed\n"); 1656 } 1657 1658 mountopts(&nd->root_args, NULL); 1659 1660 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1661 if (bootpc_ifctx_isresolved(ifctx) != 0) 1662 bootpc_decode_reply(nd, ifctx, gctx); 1663 1664 #ifdef BOOTP_NFSROOT 1665 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0) 1666 panic("bootpc: No root path offered"); 1667 #endif 1668 1669 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1670 bootpc_adjust_interface(ifctx, gctx, td); 1671 1672 soclose(bootp_so); 1673 1674 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1675 if (ifctx->gotrootpath != 0) 1676 break; 1677 if (ifctx == NULL) { 1678 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1679 if (bootpc_ifctx_isresolved(ifctx) != 0) 1680 break; 1681 } 1682 if (ifctx == NULL) 1683 goto out; 1684 1685 if (gctx->gotrootpath != 0) { 1686 struct epoch_tracker et; 1687 1688 kern_setenv("boot.netif.name", ifctx->ifp->if_xname); 1689 1690 NET_EPOCH_ENTER(et); 1691 bootpc_add_default_route(ifctx); 1692 NET_EPOCH_EXIT(et); 1693 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1694 nd->root_fh, &nd->root_fhsize, 1695 &nd->root_args, td); 1696 NET_EPOCH_ENTER(et); 1697 bootpc_remove_default_route(ifctx); 1698 NET_EPOCH_EXIT(et); 1699 if (error != 0) { 1700 if (gctx->any_root_overrides == 0) 1701 panic("nfs_boot: mount root, error=%d", error); 1702 else 1703 goto out; 1704 } 1705 rootdevnames[0] = "nfs:"; 1706 nfs_diskless_valid = 3; 1707 } 1708 1709 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1710 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1711 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1712 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1713 ifctx->myaddr.sin_addr.s_addr | 1714 ~ ifctx->netmask.sin_addr.s_addr; 1715 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1716 bcopy(&ifctx->gw, &nd->mygateway, sizeof(ifctx->gw)); 1717 1718 out: 1719 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) { 1720 STAILQ_REMOVE_HEAD(&gctx->interfaces, next); 1721 free(ifctx, M_TEMP); 1722 } 1723 free(gctx, M_TEMP); 1724 } 1725 1726 /* 1727 * RPC: mountd/mount 1728 * Given a server pathname, get an NFS file handle. 1729 * Also, sets sin->sin_port to the NFS service port. 1730 */ 1731 static int 1732 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1733 struct nfs_args *args, struct thread *td) 1734 { 1735 struct mbuf *m; 1736 int error; 1737 int authunixok; 1738 int authcount; 1739 int authver; 1740 1741 #define RPCPROG_MNT 100005 1742 #define RPCMNT_VER1 1 1743 #define RPCMNT_VER3 3 1744 #define RPCMNT_MOUNT 1 1745 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1746 #define AUTH_UNIX AUTH_SYS 1747 1748 /* XXX honor v2/v3 flags in args->flags? */ 1749 #ifdef BOOTP_NFSV3 1750 /* First try NFS v3 */ 1751 /* Get port number for MOUNTD. */ 1752 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1753 &mdsin->sin_port, td); 1754 if (error == 0) { 1755 m = xdr_string_encode(path, strlen(path)); 1756 1757 /* Do RPC to mountd. */ 1758 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1759 RPCMNT_MOUNT, &m, NULL, td); 1760 } 1761 if (error == 0) { 1762 args->flags |= NFSMNT_NFSV3; 1763 } else { 1764 #endif 1765 /* Fallback to NFS v2 */ 1766 1767 /* Get port number for MOUNTD. */ 1768 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1769 &mdsin->sin_port, td); 1770 if (error != 0) 1771 return error; 1772 1773 m = xdr_string_encode(path, strlen(path)); 1774 1775 /* Do RPC to mountd. */ 1776 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1777 RPCMNT_MOUNT, &m, NULL, td); 1778 if (error != 0) 1779 return error; /* message already freed */ 1780 1781 #ifdef BOOTP_NFSV3 1782 } 1783 #endif 1784 1785 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1786 goto bad; 1787 1788 if ((args->flags & NFSMNT_NFSV3) != 0) { 1789 if (xdr_int_decode(&m, fhsizep) != 0 || 1790 *fhsizep > NFSX_V3FHMAX || 1791 *fhsizep <= 0) 1792 goto bad; 1793 } else 1794 *fhsizep = NFSX_V2FH; 1795 1796 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1797 goto bad; 1798 1799 if (args->flags & NFSMNT_NFSV3) { 1800 if (xdr_int_decode(&m, &authcount) != 0) 1801 goto bad; 1802 authunixok = 0; 1803 if (authcount < 0 || authcount > 100) 1804 goto bad; 1805 while (authcount > 0) { 1806 if (xdr_int_decode(&m, &authver) != 0) 1807 goto bad; 1808 if (authver == AUTH_UNIX) 1809 authunixok = 1; 1810 authcount--; 1811 } 1812 if (authunixok == 0) 1813 goto bad; 1814 } 1815 1816 /* Set port number for NFS use. */ 1817 error = krpc_portmap(mdsin, NFS_PROG, 1818 (args->flags & 1819 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1820 &mdsin->sin_port, td); 1821 1822 goto out; 1823 1824 bad: 1825 error = EBADRPC; 1826 1827 out: 1828 m_freem(m); 1829 return error; 1830 } 1831 1832 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL); 1833