1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1995 Gordon Ross, Adam Glass 5 * Copyright (c) 1992 Regents of the University of California. 6 * All rights reserved. 7 * 8 * This software was developed by the Computer Systems Engineering group 9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 10 * contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Lawrence Berkeley Laboratory and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * based on: 41 * nfs/krpc_subr.c 42 * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $ 43 */ 44 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include "opt_bootp.h" 49 #include "opt_nfs.h" 50 #include "opt_rootdevname.h" 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/endian.h> 55 #include <sys/jail.h> 56 #include <sys/kernel.h> 57 #include <sys/sockio.h> 58 #include <sys/malloc.h> 59 #include <sys/mount.h> 60 #include <sys/mbuf.h> 61 #include <sys/proc.h> 62 #include <sys/reboot.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/sysctl.h> 66 #include <sys/uio.h> 67 68 #include <net/if.h> 69 #include <net/if_var.h> 70 #include <net/route.h> 71 #include <net/route/route_ctl.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_var.h> 75 #include <net/if_types.h> 76 #include <net/if_dl.h> 77 #include <net/vnet.h> 78 79 #include <nfs/nfsproto.h> 80 #include <nfsclient/nfs.h> 81 #include <nfs/nfsdiskless.h> 82 #include <nfs/krpc.h> 83 #include <nfs/xdr_subs.h> 84 85 #define BOOTP_MIN_LEN 300 /* Minimum size of bootp udp packet */ 86 87 #ifndef BOOTP_SETTLE_DELAY 88 #define BOOTP_SETTLE_DELAY 3 89 #endif 90 91 /* 92 * Wait 10 seconds for interface appearance 93 * USB ethernet adapters might require some time to pop up 94 */ 95 #ifndef BOOTP_IFACE_WAIT_TIMEOUT 96 #define BOOTP_IFACE_WAIT_TIMEOUT 10 97 #endif 98 99 /* 100 * What is the longest we will wait before re-sending a request? 101 * Note this is also the frequency of "RPC timeout" messages. 102 * The re-send loop count sup linearly to this maximum, so the 103 * first complaint will happen after (1+2+3+4+5)=15 seconds. 104 */ 105 #define MAX_RESEND_DELAY 5 /* seconds */ 106 107 /* Definitions from RFC951 */ 108 struct bootp_packet { 109 u_int8_t op; 110 u_int8_t htype; 111 u_int8_t hlen; 112 u_int8_t hops; 113 u_int32_t xid; 114 u_int16_t secs; 115 u_int16_t flags; 116 struct in_addr ciaddr; 117 struct in_addr yiaddr; 118 struct in_addr siaddr; 119 struct in_addr giaddr; 120 unsigned char chaddr[16]; 121 char sname[64]; 122 char file[128]; 123 unsigned char vend[1222]; 124 }; 125 126 struct bootpc_ifcontext { 127 STAILQ_ENTRY(bootpc_ifcontext) next; 128 struct bootp_packet call; 129 struct bootp_packet reply; 130 int replylen; 131 int overload; 132 union { 133 struct ifreq _ifreq; 134 struct in_aliasreq _in_alias_req; 135 } _req; 136 #define ireq _req._ifreq 137 #define iareq _req._in_alias_req 138 struct ifnet *ifp; 139 struct sockaddr_dl *sdl; 140 struct sockaddr_in myaddr; 141 struct sockaddr_in netmask; 142 struct sockaddr_in gw; 143 int gotgw; 144 int gotnetmask; 145 int gotrootpath; 146 int outstanding; 147 int sentmsg; 148 u_int32_t xid; 149 enum { 150 IF_BOOTP_UNRESOLVED, 151 IF_BOOTP_RESOLVED, 152 IF_BOOTP_FAILED, 153 IF_DHCP_UNRESOLVED, 154 IF_DHCP_OFFERED, 155 IF_DHCP_RESOLVED, 156 IF_DHCP_FAILED, 157 } state; 158 int dhcpquerytype; /* dhcp type sent */ 159 struct in_addr dhcpserver; 160 int gotdhcpserver; 161 uint16_t mtu; 162 }; 163 164 #define TAG_MAXLEN 1024 165 struct bootpc_tagcontext { 166 char buf[TAG_MAXLEN + 1]; 167 int overload; 168 int badopt; 169 int badtag; 170 int foundopt; 171 int taglen; 172 }; 173 174 struct bootpc_globalcontext { 175 STAILQ_HEAD(, bootpc_ifcontext) interfaces; 176 u_int32_t xid; 177 int any_root_overrides; 178 int gotrootpath; 179 int gotgw; 180 int ifnum; 181 int secs; 182 int starttime; 183 struct bootp_packet reply; 184 int replylen; 185 struct bootpc_ifcontext *setrootfs; 186 struct bootpc_ifcontext *sethostname; 187 struct bootpc_tagcontext tmptag; 188 struct bootpc_tagcontext tag; 189 }; 190 191 #define IPPORT_BOOTPC 68 192 #define IPPORT_BOOTPS 67 193 194 #define BOOTP_REQUEST 1 195 #define BOOTP_REPLY 2 196 197 /* Common tags */ 198 #define TAG_PAD 0 /* Pad option, implicit length 1 */ 199 #define TAG_SUBNETMASK 1 /* RFC 950 subnet mask */ 200 #define TAG_ROUTERS 3 /* Routers (in order of preference) */ 201 #define TAG_HOSTNAME 12 /* Client host name */ 202 #define TAG_ROOT 17 /* Root path */ 203 #define TAG_INTF_MTU 26 /* Interface MTU Size (RFC2132) */ 204 205 /* DHCP specific tags */ 206 #define TAG_OVERLOAD 52 /* Option Overload */ 207 #define TAG_MAXMSGSIZE 57 /* Maximum DHCP Message Size */ 208 209 #define TAG_END 255 /* End Option (i.e. no more options) */ 210 211 /* Overload values */ 212 #define OVERLOAD_FILE 1 213 #define OVERLOAD_SNAME 2 214 215 /* Site specific tags: */ 216 #define TAG_ROOTOPTS 130 217 #define TAG_COOKIE 134 /* ascii info for userland, via sysctl */ 218 219 #define TAG_DHCP_MSGTYPE 53 220 #define TAG_DHCP_REQ_ADDR 50 221 #define TAG_DHCP_SERVERID 54 222 #define TAG_DHCP_LEASETIME 51 223 224 #define TAG_VENDOR_INDENTIFIER 60 225 226 #define DHCP_NOMSG 0 227 #define DHCP_DISCOVER 1 228 #define DHCP_OFFER 2 229 #define DHCP_REQUEST 3 230 #define DHCP_ACK 5 231 232 /* NFS read/write block size */ 233 #ifndef BOOTP_BLOCKSIZE 234 #define BOOTP_BLOCKSIZE 8192 235 #endif 236 237 static char bootp_cookie[128]; 238 static struct socket *bootp_so; 239 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD, 240 bootp_cookie, 0, "Cookie (T134) supplied by bootp server"); 241 242 /* mountd RPC */ 243 static int md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, 244 int *fhsizep, struct nfs_args *args, struct thread *td); 245 static int setfs(struct sockaddr_in *addr, char *path, char *p, 246 const struct in_addr *siaddr); 247 static int getdec(char **ptr); 248 static int getip(char **ptr, struct in_addr *ip); 249 static void mountopts(struct nfs_args *args, char *p); 250 static int xdr_opaque_decode(struct mbuf **ptr, u_char *buf, int len); 251 static int xdr_int_decode(struct mbuf **ptr, int *iptr); 252 static void print_in_addr(struct in_addr addr); 253 static void print_sin_addr(struct sockaddr_in *addr); 254 static void clear_sinaddr(struct sockaddr_in *sin); 255 static void allocifctx(struct bootpc_globalcontext *gctx); 256 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx, 257 struct thread *td); 258 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx, 259 struct bootp_packet *bp, int len, int tag); 260 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx, 261 unsigned char *start, int len, int tag); 262 263 #ifdef BOOTP_DEBUG 264 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa); 265 void bootpboot_p_iflist(void); 266 #endif 267 268 static int bootpc_call(struct bootpc_globalcontext *gctx, 269 struct thread *td); 270 271 static void bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx, 272 struct thread *td); 273 274 static void bootpc_adjust_interface(struct bootpc_ifcontext *ifctx, 275 struct bootpc_globalcontext *gctx, struct thread *td); 276 277 static void bootpc_decode_reply(struct nfsv3_diskless *nd, 278 struct bootpc_ifcontext *ifctx, 279 struct bootpc_globalcontext *gctx); 280 281 static int bootpc_received(struct bootpc_globalcontext *gctx, 282 struct bootpc_ifcontext *ifctx); 283 284 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx); 285 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx); 286 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx); 287 288 /* 289 * In order to have multiple active interfaces with address 0.0.0.0 290 * and be able to send data to a selected interface, we first set 291 * mask to /8 on all interfaces, and temporarily set it to /0 when 292 * doing sosend(). 293 */ 294 295 #ifdef BOOTP_DEBUG 296 void 297 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa) 298 { 299 300 printf("%s flags %x, addr ", 301 ifp->if_xname, ifp->if_flags); 302 print_sin_addr((struct sockaddr_in *) ifa->ifa_addr); 303 printf(", broadcast "); 304 print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr); 305 printf(", netmask "); 306 print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask); 307 printf("\n"); 308 } 309 310 void 311 bootpboot_p_iflist(void) 312 { 313 struct ifnet *ifp; 314 struct ifaddr *ifa; 315 316 printf("Interface list:\n"); 317 IFNET_RLOCK(); 318 for (ifp = CK_STAILQ_FIRST(&V_ifnet); 319 ifp != NULL; 320 ifp = CK_STAILQ_NEXT(ifp, if_link)) { 321 for (ifa = CK_STAILQ_FIRST(&ifp->if_addrhead); 322 ifa != NULL; 323 ifa = CK_STAILQ_NEXT(ifa, ifa_link)) 324 if (ifa->ifa_addr->sa_family == AF_INET) 325 bootpboot_p_if(ifp, ifa); 326 } 327 IFNET_RUNLOCK(); 328 } 329 #endif /* defined(BOOTP_DEBUG) */ 330 331 static void 332 clear_sinaddr(struct sockaddr_in *sin) 333 { 334 335 bzero(sin, sizeof(*sin)); 336 sin->sin_len = sizeof(*sin); 337 sin->sin_family = AF_INET; 338 sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */ 339 sin->sin_port = 0; 340 } 341 342 static void 343 allocifctx(struct bootpc_globalcontext *gctx) 344 { 345 struct bootpc_ifcontext *ifctx; 346 347 ifctx = malloc(sizeof(*ifctx), M_TEMP, M_WAITOK | M_ZERO); 348 ifctx->xid = gctx->xid; 349 #ifdef BOOTP_NO_DHCP 350 ifctx->state = IF_BOOTP_UNRESOLVED; 351 #else 352 ifctx->state = IF_DHCP_UNRESOLVED; 353 #endif 354 gctx->xid += 0x100; 355 STAILQ_INSERT_TAIL(&gctx->interfaces, ifctx, next); 356 } 357 358 static __inline int 359 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx) 360 { 361 362 if (ifctx->state == IF_BOOTP_RESOLVED || 363 ifctx->state == IF_DHCP_RESOLVED) 364 return 1; 365 return 0; 366 } 367 368 static __inline int 369 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx) 370 { 371 372 if (ifctx->state == IF_BOOTP_UNRESOLVED || 373 ifctx->state == IF_DHCP_UNRESOLVED) 374 return 1; 375 return 0; 376 } 377 378 static __inline int 379 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx) 380 { 381 382 if (ifctx->state == IF_BOOTP_FAILED || 383 ifctx->state == IF_DHCP_FAILED) 384 return 1; 385 return 0; 386 } 387 388 static int 389 bootpc_received(struct bootpc_globalcontext *gctx, 390 struct bootpc_ifcontext *ifctx) 391 { 392 unsigned char dhcpreplytype; 393 char *p; 394 395 /* 396 * Need timeout for fallback to less 397 * desirable alternative. 398 */ 399 400 /* This call used for the side effect (badopt flag) */ 401 (void) bootpc_tag(&gctx->tmptag, &gctx->reply, 402 gctx->replylen, 403 TAG_END); 404 405 /* If packet is invalid, ignore it */ 406 if (gctx->tmptag.badopt != 0) 407 return 0; 408 409 p = bootpc_tag(&gctx->tmptag, &gctx->reply, 410 gctx->replylen, TAG_DHCP_MSGTYPE); 411 if (p != NULL) 412 dhcpreplytype = *p; 413 else 414 dhcpreplytype = DHCP_NOMSG; 415 416 switch (ifctx->dhcpquerytype) { 417 case DHCP_DISCOVER: 418 if (dhcpreplytype != DHCP_OFFER /* Normal DHCP offer */ 419 #ifndef BOOTP_FORCE_DHCP 420 && dhcpreplytype != DHCP_NOMSG /* Fallback to BOOTP */ 421 #endif 422 ) 423 return 0; 424 break; 425 case DHCP_REQUEST: 426 if (dhcpreplytype != DHCP_ACK) 427 return 0; 428 case DHCP_NOMSG: 429 break; 430 } 431 432 /* Ignore packet unless it gives us a root tag we didn't have */ 433 434 if ((ifctx->state == IF_BOOTP_RESOLVED || 435 (ifctx->dhcpquerytype == DHCP_DISCOVER && 436 (ifctx->state == IF_DHCP_OFFERED || 437 ifctx->state == IF_DHCP_RESOLVED))) && 438 (bootpc_tag(&gctx->tmptag, &ifctx->reply, 439 ifctx->replylen, 440 TAG_ROOT) != NULL || 441 bootpc_tag(&gctx->tmptag, &gctx->reply, 442 gctx->replylen, 443 TAG_ROOT) == NULL)) 444 return 0; 445 446 bcopy(&gctx->reply, &ifctx->reply, gctx->replylen); 447 ifctx->replylen = gctx->replylen; 448 449 /* XXX: Only reset if 'perfect' response */ 450 if (ifctx->state == IF_BOOTP_UNRESOLVED) 451 ifctx->state = IF_BOOTP_RESOLVED; 452 else if (ifctx->state == IF_DHCP_UNRESOLVED && 453 ifctx->dhcpquerytype == DHCP_DISCOVER) { 454 if (dhcpreplytype == DHCP_OFFER) 455 ifctx->state = IF_DHCP_OFFERED; 456 else 457 ifctx->state = IF_BOOTP_RESOLVED; /* Fallback */ 458 } else if (ifctx->state == IF_DHCP_OFFERED && 459 ifctx->dhcpquerytype == DHCP_REQUEST) 460 ifctx->state = IF_DHCP_RESOLVED; 461 462 463 if (ifctx->dhcpquerytype == DHCP_DISCOVER && 464 ifctx->state != IF_BOOTP_RESOLVED) { 465 p = bootpc_tag(&gctx->tmptag, &ifctx->reply, 466 ifctx->replylen, TAG_DHCP_SERVERID); 467 if (p != NULL && gctx->tmptag.taglen == 4) { 468 memcpy(&ifctx->dhcpserver, p, 4); 469 ifctx->gotdhcpserver = 1; 470 } else 471 ifctx->gotdhcpserver = 0; 472 return 1; 473 } 474 475 ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 476 ifctx->replylen, 477 TAG_ROOT) != NULL); 478 ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 479 ifctx->replylen, 480 TAG_ROUTERS) != NULL); 481 ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply, 482 ifctx->replylen, 483 TAG_SUBNETMASK) != NULL); 484 return 1; 485 } 486 487 static int 488 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td) 489 { 490 struct sockaddr_in *sin, dst; 491 struct uio auio; 492 struct sockopt sopt; 493 struct iovec aio; 494 int error, on, rcvflg, timo, len; 495 time_t atimo; 496 time_t rtimo; 497 struct timeval tv; 498 struct bootpc_ifcontext *ifctx; 499 int outstanding; 500 int gotrootpath; 501 int retry; 502 const char *s; 503 504 tv.tv_sec = 1; 505 tv.tv_usec = 0; 506 bzero(&sopt, sizeof(sopt)); 507 sopt.sopt_dir = SOPT_SET; 508 sopt.sopt_level = SOL_SOCKET; 509 sopt.sopt_name = SO_RCVTIMEO; 510 sopt.sopt_val = &tv; 511 sopt.sopt_valsize = sizeof tv; 512 513 error = sosetopt(bootp_so, &sopt); 514 if (error != 0) 515 goto out; 516 517 /* 518 * Enable broadcast. 519 */ 520 on = 1; 521 sopt.sopt_name = SO_BROADCAST; 522 sopt.sopt_val = &on; 523 sopt.sopt_valsize = sizeof on; 524 525 error = sosetopt(bootp_so, &sopt); 526 if (error != 0) 527 goto out; 528 529 /* 530 * Disable routing. 531 */ 532 533 on = 1; 534 sopt.sopt_name = SO_DONTROUTE; 535 sopt.sopt_val = &on; 536 sopt.sopt_valsize = sizeof on; 537 538 error = sosetopt(bootp_so, &sopt); 539 if (error != 0) 540 goto out; 541 542 /* 543 * Bind the local endpoint to a bootp client port. 544 */ 545 sin = &dst; 546 clear_sinaddr(sin); 547 sin->sin_port = htons(IPPORT_BOOTPC); 548 error = sobind(bootp_so, (struct sockaddr *)sin, td); 549 if (error != 0) { 550 printf("bind failed\n"); 551 goto out; 552 } 553 554 /* 555 * Setup socket address for the server. 556 */ 557 sin = &dst; 558 clear_sinaddr(sin); 559 sin->sin_addr.s_addr = INADDR_BROADCAST; 560 sin->sin_port = htons(IPPORT_BOOTPS); 561 562 /* 563 * Send it, repeatedly, until a reply is received, 564 * but delay each re-send by an increasing amount. 565 * If the delay hits the maximum, start complaining. 566 */ 567 timo = 0; 568 rtimo = 0; 569 for (;;) { 570 571 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(IN_CLASSA_NET); 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(IN_CLASSA_NET); 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 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1491 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET); 1492 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr))) 1493 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET); 1494 else 1495 ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET); 1496 } 1497 } 1498 1499 void 1500 bootpc_init(void) 1501 { 1502 struct bootpc_ifcontext *ifctx; /* Interface BOOTP contexts */ 1503 struct bootpc_globalcontext *gctx; /* Global BOOTP context */ 1504 struct ifnet *ifp; 1505 struct sockaddr_dl *sdl; 1506 struct ifaddr *ifa; 1507 int error; 1508 #ifndef BOOTP_WIRED_TO 1509 int ifcnt; 1510 #endif 1511 struct nfsv3_diskless *nd; 1512 struct thread *td; 1513 int timeout; 1514 int delay; 1515 1516 timeout = BOOTP_IFACE_WAIT_TIMEOUT * hz; 1517 delay = hz / 10; 1518 1519 nd = &nfsv3_diskless; 1520 td = curthread; 1521 1522 /* 1523 * If already filled in, don't touch it here 1524 */ 1525 if (nfs_diskless_valid != 0) 1526 return; 1527 1528 gctx = malloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO); 1529 STAILQ_INIT(&gctx->interfaces); 1530 gctx->xid = ~0xFFFF; 1531 gctx->starttime = time_second; 1532 1533 /* 1534 * If ROOTDEVNAME is defined or vfs.root.mountfrom is set then we have 1535 * root-path overrides that can potentially let us boot even if we don't 1536 * get a root path from the server, so we can treat that as a non-error. 1537 */ 1538 #ifdef ROOTDEVNAME 1539 gctx->any_root_overrides = 1; 1540 #else 1541 gctx->any_root_overrides = testenv("vfs.root.mountfrom"); 1542 #endif 1543 1544 /* 1545 * Find a network interface. 1546 */ 1547 CURVNET_SET(TD_TO_VNET(td)); 1548 #ifdef BOOTP_WIRED_TO 1549 printf("%s: wired to interface '%s'\n", __func__, 1550 __XSTRING(BOOTP_WIRED_TO)); 1551 allocifctx(gctx); 1552 #else 1553 /* 1554 * Preallocate interface context storage, if another interface 1555 * attaches and wins the race, it won't be eligible for bootp. 1556 */ 1557 ifcnt = 0; 1558 IFNET_RLOCK(); 1559 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1560 if ((ifp->if_flags & 1561 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1562 IFF_BROADCAST) 1563 continue; 1564 switch (ifp->if_alloctype) { 1565 case IFT_ETHER: 1566 break; 1567 default: 1568 continue; 1569 } 1570 ifcnt++; 1571 } 1572 IFNET_RUNLOCK(); 1573 if (ifcnt == 0) 1574 panic("%s: no eligible interfaces", __func__); 1575 for (; ifcnt > 0; ifcnt--) 1576 allocifctx(gctx); 1577 #endif 1578 1579 retry: 1580 ifctx = STAILQ_FIRST(&gctx->interfaces); 1581 IFNET_RLOCK(); 1582 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1583 if (ifctx == NULL) 1584 break; 1585 #ifdef BOOTP_WIRED_TO 1586 if (strcmp(ifp->if_xname, __XSTRING(BOOTP_WIRED_TO)) != 0) 1587 continue; 1588 #else 1589 if ((ifp->if_flags & 1590 (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) != 1591 IFF_BROADCAST) 1592 continue; 1593 switch (ifp->if_alloctype) { 1594 case IFT_ETHER: 1595 break; 1596 default: 1597 continue; 1598 } 1599 #endif 1600 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname, 1601 sizeof(ifctx->ireq.ifr_name)); 1602 ifctx->ifp = ifp; 1603 1604 /* Get HW address */ 1605 sdl = NULL; 1606 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 1607 if (ifa->ifa_addr->sa_family == AF_LINK) { 1608 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 1609 if (sdl->sdl_type == IFT_ETHER) 1610 break; 1611 } 1612 if (sdl == NULL) 1613 panic("bootpc: Unable to find HW address for %s", 1614 ifctx->ireq.ifr_name); 1615 ifctx->sdl = sdl; 1616 1617 ifctx = STAILQ_NEXT(ifctx, next); 1618 } 1619 IFNET_RUNLOCK(); 1620 CURVNET_RESTORE(); 1621 1622 if (STAILQ_EMPTY(&gctx->interfaces) || 1623 STAILQ_FIRST(&gctx->interfaces)->ifp == NULL) { 1624 if (timeout > 0) { 1625 pause("bootpc", delay); 1626 timeout -= delay; 1627 goto retry; 1628 } 1629 #ifdef BOOTP_WIRED_TO 1630 panic("%s: Could not find interface specified " 1631 "by BOOTP_WIRED_TO: " 1632 __XSTRING(BOOTP_WIRED_TO), __func__); 1633 #else 1634 panic("%s: no suitable interface", __func__); 1635 #endif 1636 } 1637 1638 error = socreate(AF_INET, &bootp_so, SOCK_DGRAM, 0, td->td_ucred, td); 1639 if (error != 0) 1640 panic("%s: socreate, error=%d", __func__, error); 1641 1642 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1643 bootpc_fakeup_interface(ifctx, td); 1644 1645 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1646 bootpc_compose_query(ifctx, td); 1647 1648 error = bootpc_call(gctx, td); 1649 if (error != 0) { 1650 printf("BOOTP call failed\n"); 1651 } 1652 1653 mountopts(&nd->root_args, NULL); 1654 1655 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1656 if (bootpc_ifctx_isresolved(ifctx) != 0) 1657 bootpc_decode_reply(nd, ifctx, gctx); 1658 1659 #ifdef BOOTP_NFSROOT 1660 if (gctx->gotrootpath == 0 && gctx->any_root_overrides == 0) 1661 panic("bootpc: No root path offered"); 1662 #endif 1663 1664 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1665 bootpc_adjust_interface(ifctx, gctx, td); 1666 1667 soclose(bootp_so); 1668 1669 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1670 if (ifctx->gotrootpath != 0) 1671 break; 1672 if (ifctx == NULL) { 1673 STAILQ_FOREACH(ifctx, &gctx->interfaces, next) 1674 if (bootpc_ifctx_isresolved(ifctx) != 0) 1675 break; 1676 } 1677 if (ifctx == NULL) 1678 goto out; 1679 1680 if (gctx->gotrootpath != 0) { 1681 struct epoch_tracker et; 1682 1683 kern_setenv("boot.netif.name", ifctx->ifp->if_xname); 1684 1685 NET_EPOCH_ENTER(et); 1686 bootpc_add_default_route(ifctx); 1687 error = md_mount(&nd->root_saddr, nd->root_hostnam, 1688 nd->root_fh, &nd->root_fhsize, 1689 &nd->root_args, td); 1690 bootpc_remove_default_route(ifctx); 1691 NET_EPOCH_EXIT(et); 1692 if (error != 0) { 1693 if (gctx->any_root_overrides == 0) 1694 panic("nfs_boot: mount root, error=%d", error); 1695 else 1696 goto out; 1697 } 1698 rootdevnames[0] = "nfs:"; 1699 nfs_diskless_valid = 3; 1700 } 1701 1702 strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name); 1703 bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr)); 1704 bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr)); 1705 ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr = 1706 ifctx->myaddr.sin_addr.s_addr | 1707 ~ ifctx->netmask.sin_addr.s_addr; 1708 bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask)); 1709 bcopy(&ifctx->gw, &nd->mygateway, sizeof(ifctx->gw)); 1710 1711 out: 1712 while((ifctx = STAILQ_FIRST(&gctx->interfaces)) != NULL) { 1713 STAILQ_REMOVE_HEAD(&gctx->interfaces, next); 1714 free(ifctx, M_TEMP); 1715 } 1716 free(gctx, M_TEMP); 1717 } 1718 1719 /* 1720 * RPC: mountd/mount 1721 * Given a server pathname, get an NFS file handle. 1722 * Also, sets sin->sin_port to the NFS service port. 1723 */ 1724 static int 1725 md_mount(struct sockaddr_in *mdsin, char *path, u_char *fhp, int *fhsizep, 1726 struct nfs_args *args, struct thread *td) 1727 { 1728 struct mbuf *m; 1729 int error; 1730 int authunixok; 1731 int authcount; 1732 int authver; 1733 1734 #define RPCPROG_MNT 100005 1735 #define RPCMNT_VER1 1 1736 #define RPCMNT_VER3 3 1737 #define RPCMNT_MOUNT 1 1738 #define AUTH_SYS 1 /* unix style (uid, gids) */ 1739 #define AUTH_UNIX AUTH_SYS 1740 1741 /* XXX honor v2/v3 flags in args->flags? */ 1742 #ifdef BOOTP_NFSV3 1743 /* First try NFS v3 */ 1744 /* Get port number for MOUNTD. */ 1745 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1746 &mdsin->sin_port, td); 1747 if (error == 0) { 1748 m = xdr_string_encode(path, strlen(path)); 1749 1750 /* Do RPC to mountd. */ 1751 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER3, 1752 RPCMNT_MOUNT, &m, NULL, td); 1753 } 1754 if (error == 0) { 1755 args->flags |= NFSMNT_NFSV3; 1756 } else { 1757 #endif 1758 /* Fallback to NFS v2 */ 1759 1760 /* Get port number for MOUNTD. */ 1761 error = krpc_portmap(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1762 &mdsin->sin_port, td); 1763 if (error != 0) 1764 return error; 1765 1766 m = xdr_string_encode(path, strlen(path)); 1767 1768 /* Do RPC to mountd. */ 1769 error = krpc_call(mdsin, RPCPROG_MNT, RPCMNT_VER1, 1770 RPCMNT_MOUNT, &m, NULL, td); 1771 if (error != 0) 1772 return error; /* message already freed */ 1773 1774 #ifdef BOOTP_NFSV3 1775 } 1776 #endif 1777 1778 if (xdr_int_decode(&m, &error) != 0 || error != 0) 1779 goto bad; 1780 1781 if ((args->flags & NFSMNT_NFSV3) != 0) { 1782 if (xdr_int_decode(&m, fhsizep) != 0 || 1783 *fhsizep > NFSX_V3FHMAX || 1784 *fhsizep <= 0) 1785 goto bad; 1786 } else 1787 *fhsizep = NFSX_V2FH; 1788 1789 if (xdr_opaque_decode(&m, fhp, *fhsizep) != 0) 1790 goto bad; 1791 1792 if (args->flags & NFSMNT_NFSV3) { 1793 if (xdr_int_decode(&m, &authcount) != 0) 1794 goto bad; 1795 authunixok = 0; 1796 if (authcount < 0 || authcount > 100) 1797 goto bad; 1798 while (authcount > 0) { 1799 if (xdr_int_decode(&m, &authver) != 0) 1800 goto bad; 1801 if (authver == AUTH_UNIX) 1802 authunixok = 1; 1803 authcount--; 1804 } 1805 if (authunixok == 0) 1806 goto bad; 1807 } 1808 1809 /* Set port number for NFS use. */ 1810 error = krpc_portmap(mdsin, NFS_PROG, 1811 (args->flags & 1812 NFSMNT_NFSV3) ? NFS_VER3 : NFS_VER2, 1813 &mdsin->sin_port, td); 1814 1815 goto out; 1816 1817 bad: 1818 error = EBADRPC; 1819 1820 out: 1821 m_freem(m); 1822 return error; 1823 } 1824 1825 SYSINIT(bootp_rootconf, SI_SUB_ROOT_CONF, SI_ORDER_FIRST, bootpc_init, NULL); 1826