sys/vfs/nfs/bootp_subr.c

   1 /*
   2  * Copyright (c) 1995 Gordon Ross, Adam Glass
   3  * Copyright (c) 1992 Regents of the University of California.
   4  * All rights reserved.
   5  *
   6  * This software was developed by the Computer Systems Engineering group
   7  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
   8  * contributed to Berkeley.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Lawrence Berkeley Laboratory and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  * nfs/krpc_subr.c
  39  * $NetBSD: krpc_subr.c,v 1.10 1995/08/08 20:43:43 gwr Exp $
  40  * $FreeBSD: src/sys/nfs/bootp_subr.c,v 1.20.2.9 2003/04/24 16:51:08 ambrisko Exp $
  41  */
  42
  43 #include "opt_bootp.h"
  44
  45 #include <sys/param.h>
  46 #include <sys/systm.h>
  47 #include <sys/kernel.h>
  48 #include <sys/sockio.h>
  49 #include <sys/proc.h>
  50 #include <sys/malloc.h>
  51 #include <sys/mount.h>
  52 #include <sys/mbuf.h>
  53 #include <sys/socket.h>
  54 #include <sys/socketvar.h>
  55 #include <sys/sysctl.h>
  56 #include <sys/uio.h>
  57 #include <sys/fcntl.h>
  58
  59 #include <net/if.h>
  60 #include <net/if_var.h>
  61 #include <net/route.h>
  62
  63 #include <netinet/in.h>
  64 #include <net/if_types.h>
  65 #include <net/if_dl.h>
  66
  67 #include "rpcv2.h"
  68 #include "nfsproto.h"
  69 #include "nfs.h"
  70 #include "nfsdiskless.h"
  71 #include "krpc.h"
  72 #include "xdr_subs.h"
  73 #include "nfsmountrpc.h"
  74
  75 #define BOOTP_MIN_LEN           300     /* Minimum size of bootp udp packet */
  76
  77 #ifndef BOOTP_SETTLE_DELAY
  78 #define BOOTP_SETTLE_DELAY 3
  79 #endif
  80
  81 /*
  82  * What is the longest we will wait before re-sending a request?
  83  * Note this is also the frequency of "RPC timeout" messages.
  84  * The re-send loop count sup linearly to this maximum, so the
  85  * first complaint will happen after (1+2+3+4+5)=15 seconds.
  86  */
  87 #define MAX_RESEND_DELAY 5      /* seconds */
  88
  89 /* Definitions from RFC951 */
  90 struct bootp_packet {
  91         u_int8_t op;
  92         u_int8_t htype;
  93         u_int8_t hlen;
  94         u_int8_t hops;
  95         u_int32_t xid;
  96         u_int16_t secs;
  97         u_int16_t flags;
  98         struct in_addr ciaddr;
  99         struct in_addr yiaddr;
 100         struct in_addr siaddr;
 101         struct in_addr giaddr;
 102         unsigned char chaddr[16];
 103         char sname[64];
 104         char file[128];
 105         unsigned char vend[1222];
 106 };
 107
 108 struct bootpc_ifcontext {
 109         struct bootpc_ifcontext *next;
 110         struct bootp_packet call;
 111         struct bootp_packet reply;
 112         int replylen;
 113         int overload;
 114         struct socket *so;
 115         struct ifreq ireq;
 116         struct ifnet *ifp;
 117         struct sockaddr_dl *sdl;
 118         struct sockaddr_in myaddr;
 119         struct sockaddr_in netmask;
 120         struct sockaddr_in gw;
 121         struct sockaddr_in broadcast;   /* Different for each interface */
 122         int gotgw;
 123         int gotnetmask;
 124         int gotrootpath;
 125         int outstanding;
 126         int sentmsg;
 127         u_int32_t xid;
 128         enum {
 129                 IF_BOOTP_UNRESOLVED,
 130                 IF_BOOTP_RESOLVED,
 131                 IF_BOOTP_FAILED,
 132                 IF_DHCP_UNRESOLVED,
 133                 IF_DHCP_OFFERED,
 134                 IF_DHCP_RESOLVED,
 135                 IF_DHCP_FAILED,
 136         } state;
 137         int dhcpquerytype;              /* dhcp type sent */
 138         struct in_addr dhcpserver;
 139         int gotdhcpserver;
 140 };
 141
 142 #define TAG_MAXLEN 1024
 143 struct bootpc_tagcontext {
 144         char buf[TAG_MAXLEN + 1];
 145         int overload;
 146         int badopt;
 147         int badtag;
 148         int foundopt;
 149         int taglen;
 150 };
 151
 152 struct bootpc_globalcontext {
 153         struct bootpc_ifcontext *interfaces;
 154         struct bootpc_ifcontext *lastinterface;
 155         u_int32_t xid;
 156         int gotrootpath;
 157         int gotswappath;
 158         int gotgw;
 159         int ifnum;
 160         int secs;
 161         int starttime;
 162         struct bootp_packet reply;
 163         int replylen;
 164         struct bootpc_ifcontext *setswapfs;
 165         struct bootpc_ifcontext *setrootfs;
 166         struct bootpc_ifcontext *sethostname;
 167         char lookup_path[24];
 168         struct bootpc_tagcontext tmptag;
 169         struct bootpc_tagcontext tag;
 170 };
 171
 172 #define IPPORT_BOOTPC 68
 173 #define IPPORT_BOOTPS 67
 174
 175 #define BOOTP_REQUEST 1
 176 #define BOOTP_REPLY 2
 177
 178 /* Common tags */
 179 #define TAG_PAD           0  /* Pad option, implicit length 1 */
 180 #define TAG_SUBNETMASK    1  /* RFC 950 subnet mask */
 181 #define TAG_ROUTERS       3  /* Routers (in order of preference) */
 182 #define TAG_HOSTNAME     12  /* Client host name */
 183 #define TAG_ROOT         17  /* Root path */
 184
 185 /* DHCP specific tags */
 186 #define TAG_OVERLOAD     52  /* Option Overload */
 187 #define TAG_MAXMSGSIZE   57  /* Maximum DHCP Message Size */
 188
 189 #define TAG_END         255  /* End Option (i.e. no more options) */
 190
 191 /* Overload values */
 192 #define OVERLOAD_FILE     1
 193 #define OVERLOAD_SNAME    2
 194
 195 /* Site specific tags: */
 196 #define TAG_SWAP        128
 197 #define TAG_SWAPSIZE    129
 198 #define TAG_ROOTOPTS    130
 199 #define TAG_SWAPOPTS    131
 200 #define TAG_COOKIE      134     /* ascii info for userland, exported via sysctl */
 201
 202 #define TAG_DHCP_MSGTYPE 53
 203 #define TAG_DHCP_REQ_ADDR 50
 204 #define TAG_DHCP_SERVERID 54
 205 #define TAG_DHCP_LEASETIME 51
 206
 207 #define TAG_VENDOR_INDENTIFIER 60
 208
 209 #define DHCP_NOMSG    0
 210 #define DHCP_DISCOVER 1
 211 #define DHCP_OFFER    2
 212 #define DHCP_REQUEST  3
 213 #define DHCP_ACK      5
 214
 215 static char bootp_cookie[128];
 216 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
 217         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
 218
 219 /* mountd RPC */
 220 static void print_in_addr(struct in_addr addr);
 221 static void print_sin_addr(struct sockaddr_in *addr);
 222 static void clear_sinaddr(struct sockaddr_in *sin);
 223 static
 224 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
 225 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 226                                  struct bootpc_globalcontext *gctx,
 227                                  struct thread *td);
 228 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
 229                                  struct bootp_packet *bp, int len, int tag);
 230 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 231                               unsigned char *start, int len, int tag);
 232
 233 #ifdef BOOTP_DEBUG
 234 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
 235 void bootpboot_p_ma(struct sockaddr *ma);
 236 void bootpboot_p_rtentry(struct rtentry *rt);
 237 void bootpboot_p_tree(struct radix_node *rn);
 238 void bootpboot_p_rtlist(void);
 239 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
 240 void bootpboot_p_iflist(void);
 241 #endif
 242
 243 static int  bootpc_call(struct bootpc_globalcontext *gctx,
 244                         struct thread *td);
 245
 246 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 247                                    struct bootpc_globalcontext *gctx,
 248                                    struct thread *td);
 249
 250 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 251                                    struct bootpc_globalcontext *gctx,
 252                                    struct thread *td);
 253
 254 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
 255                                 struct bootpc_ifcontext *ifctx,
 256                                 struct bootpc_globalcontext *gctx);
 257
 258 static int bootpc_received(struct bootpc_globalcontext *gctx,
 259                            struct bootpc_ifcontext *ifctx);
 260
 261 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
 262 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
 263 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
 264
 265 void bootpc_init(void);
 266
 267 /*
 268  * In order to have multiple active interfaces with address 0.0.0.0
 269  * and be able to send data to a selected interface, we perform
 270  * some tricks:
 271  *
 272  *  - The 'broadcast' address is different for each interface.
 273  *
 274  *  - We temporarily add routing pointing 255.255.255.255 to the
 275  *    selected interface broadcast address, thus the packet sent
 276  *    goes to that interface.
 277  */
 278
 279 #ifdef BOOTP_DEBUG
 280 void
 281 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
 282 {
 283         if (sa == NULL) {
 284                 kprintf("(sockaddr *) <null>");
 285                 return;
 286         }
 287         switch (sa->sa_family) {
 288         case AF_INET:
 289         {
 290                 struct sockaddr_in *sin;
 291
 292                 sin = (struct sockaddr_in *) sa;
 293                 kprintf("inet ");
 294                 print_sin_addr(sin);
 295                 if (ma != NULL) {
 296                         sin = (struct sockaddr_in *) ma;
 297                         kprintf(" mask ");
 298                         print_sin_addr(sin);
 299                 }
 300         }
 301         break;
 302         case AF_LINK:
 303         {
 304                 struct sockaddr_dl *sli;
 305                 int i;
 306
 307                 sli = (struct sockaddr_dl *) sa;
 308                 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
 309                 for (i = 0; i < sli->sdl_alen; i++) {
 310                         if (i > 0)
 311                                 kprintf(":");
 312                         kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
 313                 }
 314         }
 315         break;
 316         default:
 317                 kprintf("af%d", sa->sa_family);
 318         }
 319 }
 320
 321
 322 void
 323 bootpboot_p_ma(struct sockaddr *ma)
 324 {
 325         if (ma == NULL) {
 326                 kprintf("<null>");
 327                 return;
 328         }
 329         kprintf("%x", *(int *)ma);
 330 }
 331
 332
 333 void
 334 bootpboot_p_rtentry(struct rtentry *rt)
 335 {
 336         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
 337         kprintf(" ");
 338         bootpboot_p_ma(rt->rt_genmask);
 339         kprintf(" ");
 340         bootpboot_p_sa(rt->rt_gateway, NULL);
 341         kprintf(" ");
 342         kprintf("flags %x", (unsigned short) rt->rt_flags);
 343         kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
 344         kprintf(" %s\n", if_name(rt->rt_ifp));
 345 }
 346
 347
 348 void
 349 bootpboot_p_tree(struct radix_node *rn)
 350 {
 351         while (rn != NULL) {
 352                 if (rn->rn_bit < 0) {
 353                         if ((rn->rn_flags & RNF_ROOT) != 0) {
 354                         } else {
 355                                 bootpboot_p_rtentry((struct rtentry *) rn);
 356                         }
 357                         rn = rn->rn_dupedkey;
 358                 } else {
 359                         bootpboot_p_tree(rn->rn_left);
 360                         bootpboot_p_tree(rn->rn_right);
 361                         return;
 362                 }
 363         }
 364 }
 365
 366
 367 void
 368 bootpboot_p_rtlist(void)
 369 {
 370         kprintf("Routing table:\n");
 371         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
 372 }
 373
 374
 375 void
 376 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
 377 {
 378         kprintf("%s flags %x, addr ",
 379                if_name(ifp),
 380                (unsigned short) ifp->if_flags);
 381         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
 382         kprintf(", broadcast ");
 383         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
 384         kprintf(", netmask ");
 385         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
 386         kprintf("\n");
 387 }
 388
 389
 390 void
 391 bootpboot_p_iflist(void)
 392 {
 393         struct ifnet *ifp;
 394         struct ifaddr_container *ifac;
 395
 396         kprintf("Interface list:\n");
 397         ifnet_lock();
 398         TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
 399                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 400                         struct ifaddr *ifa = ifac->ifa;
 401
 402                         if (ifa->ifa_addr->sa_family == AF_INET)
 403                                 bootpboot_p_if(ifp, ifa);
 404                 }
 405         }
 406         ifnet_unlock();
 407 }
 408 #endif /* defined(BOOTP_DEBUG) */
 409
 410
 411 static void
 412 clear_sinaddr(struct sockaddr_in *sin)
 413 {
 414         bzero(sin, sizeof(*sin));
 415         sin->sin_len = sizeof(*sin);
 416         sin->sin_family = AF_INET;
 417         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
 418         sin->sin_port = 0;
 419 }
 420
 421
 422 static struct bootpc_ifcontext *
 423 allocifctx(struct bootpc_globalcontext *gctx)
 424 {
 425         struct bootpc_ifcontext *ifctx;
 426         ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
 427                                                    M_TEMP, M_WAITOK);
 428         bzero(ifctx, sizeof(*ifctx));
 429         ifctx->xid = gctx->xid;
 430 #ifdef BOOTP_NO_DHCP
 431         ifctx->state = IF_BOOTP_UNRESOLVED;
 432 #else
 433         ifctx->state = IF_DHCP_UNRESOLVED;
 434 #endif
 435         gctx->xid += 0x100;
 436         return ifctx;
 437 }
 438
 439
 440 static __inline int
 441 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
 442 {
 443         if (ifctx->state == IF_BOOTP_RESOLVED ||
 444             ifctx->state == IF_DHCP_RESOLVED)
 445                 return 1;
 446         return 0;
 447 }
 448
 449
 450 static __inline int
 451 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
 452 {
 453         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
 454             ifctx->state == IF_DHCP_UNRESOLVED)
 455                 return 1;
 456         return 0;
 457 }
 458
 459
 460 static __inline int
 461 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
 462 {
 463         if (ifctx->state == IF_BOOTP_FAILED ||
 464             ifctx->state == IF_DHCP_FAILED)
 465                 return 1;
 466         return 0;
 467 }
 468
 469
 470 static int
 471 bootpc_received(struct bootpc_globalcontext *gctx,
 472                 struct bootpc_ifcontext *ifctx)
 473 {
 474         unsigned char dhcpreplytype;
 475         char *p;
 476         /*
 477          * Need timeout for fallback to less
 478          * desirable alternative.
 479          */
 480
 481
 482         /* This call used for the side effect (badopt flag) */
 483         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
 484                           gctx->replylen,
 485                           TAG_END);
 486
 487         /* If packet is invalid, ignore it */
 488         if (gctx->tmptag.badopt != 0)
 489                 return 0;
 490
 491         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
 492                        gctx->replylen, TAG_DHCP_MSGTYPE);
 493         if (p != NULL)
 494                 dhcpreplytype = *p;
 495         else
 496                 dhcpreplytype = DHCP_NOMSG;
 497
 498         switch (ifctx->dhcpquerytype) {
 499         case DHCP_DISCOVER:
 500                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
 501 #ifndef BOOTP_FORCE_DHCP
 502                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
 503 #endif
 504                         )
 505                         return 0;
 506                 break;
 507         case DHCP_REQUEST:
 508                 if (dhcpreplytype != DHCP_ACK)
 509                         return 0;
 510                 /* fall through */
 511         case DHCP_NOMSG:
 512                 break;
 513         }
 514
 515
 516         /* Ignore packet unless it gives us a root tag we didn't have */
 517
 518         if ((ifctx->state == IF_BOOTP_RESOLVED ||
 519              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 520               (ifctx->state == IF_DHCP_OFFERED ||
 521                ifctx->state == IF_DHCP_RESOLVED))) &&
 522             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 523                         ifctx->replylen,
 524                         TAG_ROOT) != NULL ||
 525              bootpc_tag(&gctx->tmptag, &gctx->reply,
 526                         gctx->replylen,
 527                         TAG_ROOT) == NULL))
 528                 return 0;
 529
 530         bcopy(&gctx->reply,
 531               &ifctx->reply,
 532               gctx->replylen);
 533         ifctx->replylen = gctx->replylen;
 534
 535         /* XXX: Only reset if 'perfect' response */
 536         if (ifctx->state == IF_BOOTP_UNRESOLVED)
 537                 ifctx->state = IF_BOOTP_RESOLVED;
 538         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
 539                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
 540                 if (dhcpreplytype == DHCP_OFFER)
 541                         ifctx->state = IF_DHCP_OFFERED;
 542                 else
 543                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
 544         } else if (ifctx->state == IF_DHCP_OFFERED &&
 545                    ifctx->dhcpquerytype == DHCP_REQUEST)
 546                 ifctx->state = IF_DHCP_RESOLVED;
 547
 548
 549         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 550             ifctx->state != IF_BOOTP_RESOLVED) {
 551                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
 552                                ifctx->replylen, TAG_DHCP_SERVERID);
 553                 if (p != NULL && gctx->tmptag.taglen == 4) {
 554                         memcpy(&ifctx->dhcpserver, p, 4);
 555                         ifctx->gotdhcpserver = 1;
 556                 } else
 557                         ifctx->gotdhcpserver = 0;
 558                 return 1;
 559         }
 560
 561         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 562                                          ifctx->replylen,
 563                                          TAG_ROOT) != NULL);
 564         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 565                                    ifctx->replylen,
 566                                    TAG_ROUTERS) != NULL);
 567         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 568                                         ifctx->replylen,
 569                                         TAG_SUBNETMASK) != NULL);
 570         return 1;
 571 }
 572
 573 static int
 574 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
 575 {
 576         struct socket *so;
 577         struct sockaddr_in *sin, dst;
 578         struct uio auio;
 579         struct sockopt sopt;
 580         struct iovec aio;
 581         int error, on, rcvflg, timo, len;
 582         time_t atimo;
 583         time_t rtimo;
 584         struct timeval tv;
 585         struct bootpc_ifcontext *ifctx;
 586         int outstanding;
 587         int gotrootpath;
 588         int retry;
 589         const char *s;
 590         char hexstr[64];
 591
 592         /*
 593          * Create socket and set its recieve timeout.
 594          */
 595         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
 596         if (error != 0)
 597                 goto out;
 598
 599         tv.tv_sec = 1;
 600         tv.tv_usec = 0;
 601         bzero(&sopt, sizeof(sopt));
 602         sopt.sopt_level = SOL_SOCKET;
 603         sopt.sopt_name = SO_RCVTIMEO;
 604         sopt.sopt_val = &tv;
 605         sopt.sopt_valsize = sizeof tv;
 606
 607         error = sosetopt(so, &sopt);
 608         if (error != 0)
 609                 goto out;
 610
 611         /*
 612          * Enable broadcast.
 613          */
 614         on = 1;
 615         sopt.sopt_name = SO_BROADCAST;
 616         sopt.sopt_val = &on;
 617         sopt.sopt_valsize = sizeof on;
 618
 619         error = sosetopt(so, &sopt);
 620         if (error != 0)
 621                 goto out;
 622
 623         /*
 624          * Disable routing.
 625          */
 626
 627         on = 1;
 628         sopt.sopt_name = SO_DONTROUTE;
 629         sopt.sopt_val = &on;
 630         sopt.sopt_valsize = sizeof on;
 631
 632         error = sosetopt(so, &sopt);
 633         if (error != 0)
 634                 goto out;
 635
 636         /*
 637          * Bind the local endpoint to a bootp client port.
 638          */
 639         sin = &dst;
 640         clear_sinaddr(sin);
 641         sin->sin_port = htons(IPPORT_BOOTPC);
 642         error = sobind(so, (struct sockaddr *)sin, td);
 643         if (error != 0) {
 644                 kprintf("bind failed\n");
 645                 goto out;
 646         }
 647
 648         /*
 649          * Setup socket address for the server.
 650          */
 651         sin = &dst;
 652         clear_sinaddr(sin);
 653         sin->sin_addr.s_addr = INADDR_BROADCAST;
 654         sin->sin_port = htons(IPPORT_BOOTPS);
 655
 656         /*
 657          * Send it, repeatedly, until a reply is received,
 658          * but delay each re-send by an increasing amount.
 659          * If the delay hits the maximum, start complaining.
 660          */
 661         timo = 0;
 662         rtimo = 0;
 663         for (;;) {
 664
 665                 outstanding = 0;
 666                 gotrootpath = 0;
 667
 668                 for (ifctx = gctx->interfaces;
 669                      ifctx != NULL;
 670                      ifctx = ifctx->next) {
 671                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
 672                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
 673                                        ifctx->replylen,
 674                                        TAG_ROOT) != NULL)
 675                                 gotrootpath = 1;
 676                 }
 677
 678                 for (ifctx = gctx->interfaces;
 679                      ifctx != NULL;
 680                      ifctx = ifctx->next) {
 681                         ifctx->outstanding = 0;
 682                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
 683                             gotrootpath != 0) {
 684                                 continue;
 685                         }
 686                         if (bootpc_ifctx_isfailed(ifctx) != 0)
 687                                 continue;
 688
 689                         outstanding++;
 690                         ifctx->outstanding = 1;
 691
 692                         /* Proceed to next step in DHCP negotiation */
 693                         if ((ifctx->state == IF_DHCP_OFFERED &&
 694                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
 695                             (ifctx->state == IF_DHCP_UNRESOLVED &&
 696                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
 697                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
 698                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
 699                                 ifctx->sentmsg = 0;
 700                                 bootpc_compose_query(ifctx, gctx, td);
 701                         }
 702
 703                         /* Send BOOTP request (or re-send). */
 704
 705                         if (ifctx->sentmsg == 0) {
 706                                 switch(ifctx->dhcpquerytype) {
 707                                 case DHCP_DISCOVER:
 708                                         s = "DHCP Discover";
 709                                         break;
 710                                 case DHCP_REQUEST:
 711                                         s = "DHCP Request";
 712                                         break;
 713                                 case DHCP_NOMSG:
 714                                 default:
 715                                         s = "BOOTP Query";
 716                                         break;
 717                                 }
 718                                 hexncpy((u_char *)LLADDR(ifctx->sdl),
 719                                     ifctx->sdl->sdl_alen, hexstr,
 720                                     HEX_NCPYLEN(ifctx->sdl->sdl_alen), ":");
 721                                 kprintf("Sending %s packet from "
 722                                        "interface %s (%s)\n",
 723                                        s, ifctx->ireq.ifr_name,
 724                                        hexstr);
 725                                 ifctx->sentmsg = 1;
 726                         }
 727
 728                         aio.iov_base = (caddr_t) &ifctx->call;
 729                         aio.iov_len = sizeof(ifctx->call);
 730
 731                         auio.uio_iov = &aio;
 732                         auio.uio_iovcnt = 1;
 733                         auio.uio_segflg = UIO_SYSSPACE;
 734                         auio.uio_rw = UIO_WRITE;
 735                         auio.uio_offset = 0;
 736                         auio.uio_resid = sizeof(ifctx->call);
 737                         auio.uio_td = td;
 738
 739                         /* Set netmask to 0.0.0.0 */
 740
 741                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 742                         clear_sinaddr(sin);
 743                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 744                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
 745                         if (error != 0)
 746                                 panic("bootpc_call:"
 747                                       "set if netmask, error=%d",
 748                                       error);
 749
 750                         error = sosend(so, (struct sockaddr *) &dst,
 751                                        &auio, NULL, NULL, 0, td);
 752                         if (error != 0) {
 753                                 kprintf("bootpc_call: sosend: %d state %08x\n",
 754                                        error, (int) so->so_state);
 755                         }
 756
 757                         /* XXX: Is this needed ? */
 758                         tsleep(&error, 0, "bootpw", 10);
 759
 760                         /* Set netmask to 255.0.0.0 */
 761
 762                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 763                         clear_sinaddr(sin);
 764                         sin->sin_addr.s_addr = htonl(0xff000000u);
 765                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 766                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
 767                         if (error != 0)
 768                                 panic("bootpc_call:"
 769                                       "set if netmask, error=%d",
 770                                       error);
 771
 772                 }
 773
 774                 if (outstanding == 0 &&
 775                     (rtimo == 0 || time_uptime >= rtimo)) {
 776                         error = 0;
 777                         goto gotreply;
 778                 }
 779
 780                 /* Determine new timeout. */
 781                 if (timo < MAX_RESEND_DELAY)
 782                         timo++;
 783                 else {
 784                         kprintf("DHCP/BOOTP timeout for server ");
 785                         print_sin_addr(&dst);
 786                         kprintf("\n");
 787                 }
 788
 789                 /*
 790                  * Wait for up to timo seconds for a reply.
 791                  * The socket receive timeout was set to 1 second.
 792                  */
 793                 atimo = timo + time_uptime;
 794                 while (time_uptime < atimo) {
 795                         aio.iov_base = (caddr_t) &gctx->reply;
 796                         aio.iov_len = sizeof(gctx->reply);
 797
 798                         auio.uio_iov = &aio;
 799                         auio.uio_iovcnt = 1;
 800                         auio.uio_segflg = UIO_SYSSPACE;
 801                         auio.uio_rw = UIO_READ;
 802                         auio.uio_offset = 0;
 803                         auio.uio_resid = sizeof(gctx->reply);
 804                         auio.uio_td = td;
 805
 806                         rcvflg = 0;
 807                         error = soreceive(so, NULL, &auio,
 808                                           NULL, NULL, &rcvflg);
 809                         gctx->secs = time_uptime - gctx->starttime;
 810                         for (ifctx = gctx->interfaces;
 811                              ifctx != NULL;
 812                              ifctx = ifctx->next) {
 813                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
 814                                     bootpc_ifctx_isfailed(ifctx) != 0)
 815                                         continue;
 816
 817                                 ifctx->call.secs = htons(gctx->secs);
 818                         }
 819                         if (error == EWOULDBLOCK)
 820                                 continue;
 821                         if (error != 0)
 822                                 goto out;
 823                         len = sizeof(gctx->reply) - auio.uio_resid;
 824
 825                         /* Do we have the required number of bytes ? */
 826                         if (len < BOOTP_MIN_LEN)
 827                                 continue;
 828                         gctx->replylen = len;
 829
 830                         /* Is it a reply? */
 831                         if (gctx->reply.op != BOOTP_REPLY)
 832                                 continue;
 833
 834                         /* Is this an answer to our query */
 835                         for (ifctx = gctx->interfaces;
 836                              ifctx != NULL;
 837                              ifctx = ifctx->next) {
 838                                 if (gctx->reply.xid != ifctx->call.xid)
 839                                         continue;
 840
 841                                 /* Same HW address size ? */
 842                                 if (gctx->reply.hlen != ifctx->call.hlen)
 843                                         continue;
 844
 845                                 /* Correct HW address ? */
 846                                 if (bcmp(gctx->reply.chaddr,
 847                                          ifctx->call.chaddr,
 848                                          ifctx->call.hlen) != 0)
 849                                         continue;
 850
 851                                 break;
 852                         }
 853
 854                         if (ifctx != NULL) {
 855                                 s =  bootpc_tag(&gctx->tmptag,
 856                                                 &gctx->reply,
 857                                                 gctx->replylen,
 858                                                 TAG_DHCP_MSGTYPE);
 859                                 if (s != NULL) {
 860                                         switch (*s) {
 861                                         case DHCP_OFFER:
 862                                                 s = "DHCP Offer";
 863                                                 break;
 864                                         case DHCP_ACK:
 865                                                 s = "DHCP Ack";
 866                                                 break;
 867                                         default:
 868                                                 s = "DHCP (unexpected)";
 869                                                 break;
 870                                         }
 871                                 } else
 872                                         s = "BOOTP Reply";
 873
 874                                 kprintf("Received %s packet"
 875                                        " on %s from ",
 876                                        s,
 877                                        ifctx->ireq.ifr_name);
 878                                 print_in_addr(gctx->reply.siaddr);
 879                                 if (gctx->reply.giaddr.s_addr !=
 880                                     htonl(INADDR_ANY)) {
 881                                         kprintf(" via ");
 882                                         print_in_addr(gctx->reply.giaddr);
 883                                 }
 884                                 if (bootpc_received(gctx, ifctx) != 0) {
 885                                         kprintf(" (accepted)");
 886                                         if (ifctx->outstanding) {
 887                                                 ifctx->outstanding = 0;
 888                                                 outstanding--;
 889                                         }
 890                                         /* Network settle delay */
 891                                         if (outstanding == 0)
 892                                                 atimo = time_uptime +
 893                                                         BOOTP_SETTLE_DELAY;
 894                                 } else
 895                                         kprintf(" (ignored)");
 896                                 if (ifctx->gotrootpath) {
 897                                         gotrootpath = 1;
 898                                         rtimo = time_uptime +
 899                                                 BOOTP_SETTLE_DELAY;
 900                                         kprintf(" (got root path)");
 901                                 } else
 902                                         kprintf(" (no root path)");
 903                                 kprintf("\n");
 904                         }
 905                 } /* while secs */
 906 #ifdef BOOTP_TIMEOUT
 907                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
 908                         break;
 909 #endif
 910                 /* Force a retry if halfway in DHCP negotiation */
 911                 retry = 0;
 912                 for (ifctx = gctx->interfaces; ifctx != NULL;
 913                      ifctx = ifctx->next) {
 914                         if (ifctx->state == IF_DHCP_OFFERED) {
 915                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
 916                                         retry = 1;
 917                                 else
 918                                         ifctx->state = IF_DHCP_UNRESOLVED;
 919                         }
 920                 }
 921
 922                 if (retry != 0)
 923                         continue;
 924
 925                 if (gotrootpath != 0) {
 926                         gctx->gotrootpath = gotrootpath;
 927                         if (rtimo != 0 && time_uptime >= rtimo)
 928                                 break;
 929                 }
 930         } /* forever send/receive */
 931
 932         /*
 933          * XXX: These are errors of varying seriousness being silently
 934          * ignored
 935          */
 936
 937         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 938                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
 939                         kprintf("%s timeout for interface %s\n",
 940                                ifctx->dhcpquerytype != DHCP_NOMSG ?
 941                                "DHCP" : "BOOTP",
 942                                ifctx->ireq.ifr_name);
 943                 }
 944         }
 945         if (gctx->gotrootpath != 0) {
 946 #if 0
 947                 kprintf("Got a root path, ignoring remaining timeout\n");
 948 #endif
 949                 error = 0;
 950                 goto out;
 951         }
 952 #ifndef BOOTP_NFSROOT
 953         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 954                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
 955                         error = 0;
 956                         goto out;
 957                 }
 958         }
 959 #endif
 960         error = ETIMEDOUT;
 961         goto out;
 962
 963 gotreply:
 964 out:
 965         soclose(so, FNONBLOCK);
 966         return error;
 967 }
 968
 969
 970 static int
 971 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 972                         struct bootpc_globalcontext *gctx,
 973                         struct thread *td)
 974 {
 975         struct ifaddr_container *ifac;
 976         struct sockaddr_in *sin;
 977         int error;
 978
 979         struct ifreq *ireq;
 980         struct socket *so;
 981         struct sockaddr_dl *sdl;
 982
 983         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
 984         if (error != 0)
 985                 panic("nfs_boot: socreate, error=%d", error);
 986
 987         ireq = &ifctx->ireq;
 988         so = ifctx->so;
 989
 990         /*
 991          * Bring up the interface.
 992          *
 993          * Get the old interface flags and or IFF_UP into them; if
 994          * IFF_UP set blindly, interface selection can be clobbered.
 995          */
 996         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
 997         if (error != 0)
 998                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
 999         ireq->ifr_flags |= IFF_UP;
1000         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1001         if (error != 0)
1002                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1003
1004         /*
1005          * Do enough of ifconfig(8) so that the chosen interface
1006          * can talk to the servers.  (just set the address)
1007          */
1008
1009         /* addr is 0.0.0.0 */
1010
1011         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1012         clear_sinaddr(sin);
1013         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1014         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1015                 panic("bootpc_fakeup_interface: "
1016                       "set if addr, error=%d", error);
1017
1018         /* netmask is 255.0.0.0 */
1019
1020         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1021         clear_sinaddr(sin);
1022         sin->sin_addr.s_addr = htonl(0xff000000u);
1023         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1024         if (error != 0)
1025                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1026                       error);
1027
1028         /* Broadcast is 255.255.255.255 */
1029
1030         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1031         clear_sinaddr(sin);
1032         clear_sinaddr(&ifctx->broadcast);
1033         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1034         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1035
1036         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1037         if (error != 0 && error != EADDRNOTAVAIL)
1038                 panic("bootpc_fakeup_interface: "
1039                       "set if broadcast addr, error=%d",
1040                       error);
1041         error = 0;
1042
1043         /* Get HW address */
1044
1045         sdl = NULL;
1046         TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1047                 struct ifaddr *ifa = ifac->ifa;
1048
1049                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1050                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1051                     sdl->sdl_type == IFT_ETHER)
1052                         break;
1053         }
1054
1055         if (sdl == NULL)
1056                 panic("bootpc: Unable to find HW address for %s",
1057                       ifctx->ireq.ifr_name);
1058         ifctx->sdl = sdl;
1059
1060         return error;
1061 }
1062
1063
1064 static int
1065 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1066                         struct bootpc_globalcontext *gctx,
1067                         struct thread *td)
1068 {
1069         int error;
1070         struct sockaddr_in defdst;
1071         struct sockaddr_in defmask;
1072         struct sockaddr_in *sin;
1073
1074         struct ifreq *ireq;
1075         struct socket *so;
1076         struct sockaddr_in *myaddr;
1077         struct sockaddr_in *netmask;
1078         struct sockaddr_in *gw;
1079
1080         ireq = &ifctx->ireq;
1081         so = ifctx->so;
1082         myaddr = &ifctx->myaddr;
1083         netmask = &ifctx->netmask;
1084         gw = &ifctx->gw;
1085
1086         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1087
1088                 /* Shutdown interfaces where BOOTP failed */
1089
1090                 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1091                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1092                 if (error != 0)
1093                         panic("bootpc_adjust_interface: "
1094                               "SIOCGIFFLAGS, error=%d", error);
1095                 ireq->ifr_flags &= ~IFF_UP;
1096                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1097                 if (error != 0)
1098                         panic("bootpc_adjust_interface: "
1099                               "SIOCSIFFLAGS, error=%d", error);
1100
1101                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1102                 clear_sinaddr(sin);
1103                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1104                 if (error != 0 && (error != EADDRNOTAVAIL ||
1105                                    ifctx == gctx->interfaces))
1106                         panic("bootpc_adjust_interface: "
1107                               "SIOCDIFADDR, error=%d", error);
1108
1109                 return 0;
1110         }
1111
1112         kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1113         /*
1114          * Do enough of ifconfig(8) so that the chosen interface
1115          * can talk to the servers.  (just set the address)
1116          */
1117         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1118         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1119         if (error != 0)
1120                 panic("bootpc_adjust_interface: "
1121                       "set if netmask, error=%d", error);
1122
1123         /* Broadcast is with host part of IP address all 1's */
1124
1125         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1126         clear_sinaddr(sin);
1127         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1128                 ~ netmask->sin_addr.s_addr;
1129         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1130         if (error != 0)
1131                 panic("bootpc_adjust_interface: "
1132                       "set if broadcast addr, error=%d", error);
1133
1134         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1135         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1136         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1137                 panic("bootpc_adjust_interface: "
1138                       "set if addr, error=%d", error);
1139
1140         /* Add new default route */
1141
1142         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1143                 clear_sinaddr(&defdst);
1144                 clear_sinaddr(&defmask);
1145                 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1146                                          (struct sockaddr *) gw,
1147                                          (struct sockaddr *) &defmask,
1148                                          (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1149                 if (error != 0) {
1150                         kprintf("bootpc_adjust_interface: "
1151                                "add net route, error=%d\n", error);
1152                         return error;
1153                 }
1154         }
1155
1156         return 0;
1157 }
1158
1159 static void
1160 print_sin_addr(struct sockaddr_in *sin)
1161 {
1162         print_in_addr(sin->sin_addr);
1163 }
1164
1165
1166 static void
1167 print_in_addr(struct in_addr addr)
1168 {
1169         unsigned int ip;
1170
1171         ip = ntohl(addr.s_addr);
1172         kprintf("%d.%d.%d.%d",
1173                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1174 }
1175
1176 static void
1177 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1178                      struct bootpc_globalcontext *gctx, struct thread *td)
1179 {
1180         unsigned char *vendp;
1181         unsigned char vendor_client[64];
1182         uint32_t leasetime;
1183         uint8_t vendor_client_len;
1184
1185         ifctx->gotrootpath = 0;
1186
1187         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1188
1189         /* bootpc part */
1190         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1191         ifctx->call.htype = 1;                  /* 10mb ethernet */
1192         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1193         ifctx->call.hops = 0;
1194         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1195                 ifctx->xid++;
1196         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1197         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1198
1199         vendp = ifctx->call.vend;
1200         *vendp++ = 99;          /* RFC1048 cookie */
1201         *vendp++ = 130;
1202         *vendp++ = 83;
1203         *vendp++ = 99;
1204         *vendp++ = TAG_MAXMSGSIZE;
1205         *vendp++ = 2;
1206         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1207         *vendp++ = sizeof(struct bootp_packet) & 255;
1208
1209         ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1210                 ostype, MACHINE, osrelease);
1211         vendor_client_len = strlen(vendor_client);
1212         *vendp++ = TAG_VENDOR_INDENTIFIER;
1213         *vendp++ = vendor_client_len;
1214         memcpy(vendp, vendor_client, vendor_client_len);
1215         vendp += vendor_client_len;
1216         ifctx->dhcpquerytype = DHCP_NOMSG;
1217         switch (ifctx->state) {
1218         case IF_DHCP_UNRESOLVED:
1219                 *vendp++ = TAG_DHCP_MSGTYPE;
1220                 *vendp++ = 1;
1221                 *vendp++ = DHCP_DISCOVER;
1222                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1223                 ifctx->gotdhcpserver = 0;
1224                 break;
1225         case IF_DHCP_OFFERED:
1226                 *vendp++ = TAG_DHCP_MSGTYPE;
1227                 *vendp++ = 1;
1228                 *vendp++ = DHCP_REQUEST;
1229                 ifctx->dhcpquerytype = DHCP_REQUEST;
1230                 *vendp++ = TAG_DHCP_REQ_ADDR;
1231                 *vendp++ = 4;
1232                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1233                 vendp += 4;
1234                 if (ifctx->gotdhcpserver != 0) {
1235                         *vendp++ = TAG_DHCP_SERVERID;
1236                         *vendp++ = 4;
1237                         memcpy(vendp, &ifctx->dhcpserver, 4);
1238                         vendp += 4;
1239                 }
1240                 *vendp++ = TAG_DHCP_LEASETIME;
1241                 *vendp++ = 4;
1242                 leasetime = htonl(300);
1243                 memcpy(vendp, &leasetime, 4);
1244                 vendp += 4;
1245         default:
1246                 ;
1247         }
1248         *vendp = TAG_END;
1249
1250         ifctx->call.secs = 0;
1251         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1252 }
1253
1254
1255 static int
1256 bootpc_hascookie(struct bootp_packet *bp)
1257 {
1258         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1259                 bp->vend[2] == 83 && bp->vend[3] == 99);
1260 }
1261
1262
1263 static void
1264 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1265                   unsigned char *start, int len, int tag)
1266 {
1267         unsigned char *j;
1268         unsigned char *ej;
1269         unsigned char code;
1270
1271         if (tctx->badtag != 0 || tctx->badopt != 0)
1272                 return;
1273
1274         j = start;
1275         ej = j + len;
1276
1277         while (j < ej) {
1278                 code = *j++;
1279                 if (code == TAG_PAD)
1280                         continue;
1281                 if (code == TAG_END)
1282                         return;
1283                 if (j >= ej || j + *j + 1 > ej) {
1284                         tctx->badopt = 1;
1285                         return;
1286                 }
1287                 len = *j++;
1288                 if (code == tag) {
1289                         if (tctx->taglen + len > TAG_MAXLEN) {
1290                                 tctx->badtag = 1;
1291                                 return;
1292                         }
1293                         tctx->foundopt = 1;
1294                         if (len > 0)
1295                                 memcpy(tctx->buf + tctx->taglen,
1296                                        j, len);
1297                         tctx->taglen += len;
1298                 }
1299                 if (code == TAG_OVERLOAD)
1300                         tctx->overload = *j;
1301
1302                 j += len;
1303         }
1304 }
1305
1306
1307 static unsigned char *
1308 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1309            int len, int tag)
1310 {
1311         tctx->overload = 0;
1312         tctx->badopt = 0;
1313         tctx->badtag = 0;
1314         tctx->foundopt = 0;
1315         tctx->taglen = 0;
1316
1317         if (bootpc_hascookie(bp) == 0)
1318                 return NULL;
1319
1320         bootpc_tag_helper(tctx, &bp->vend[4],
1321                           (unsigned char *) bp + len - &bp->vend[4], tag);
1322
1323         if ((tctx->overload & OVERLOAD_FILE) != 0)
1324                 bootpc_tag_helper(tctx,
1325                                   (unsigned char *) bp->file,
1326                                   sizeof(bp->file),
1327                                   tag);
1328         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1329                 bootpc_tag_helper(tctx,
1330                                   (unsigned char *) bp->sname,
1331                                   sizeof(bp->sname),
1332                                   tag);
1333
1334         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1335                 return NULL;
1336         tctx->buf[tctx->taglen] = '\0';
1337         return tctx->buf;
1338 }
1339
1340
1341 static void
1342 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1343                     struct bootpc_globalcontext *gctx)
1344 {
1345         char *p;
1346         unsigned int ip;
1347
1348         ifctx->gotgw = 0;
1349         ifctx->gotnetmask = 0;
1350
1351         clear_sinaddr(&ifctx->myaddr);
1352         clear_sinaddr(&ifctx->netmask);
1353         clear_sinaddr(&ifctx->gw);
1354
1355         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1356
1357         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1358         ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1359                  "swap.%d.%d.%d.%d",
1360                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1361
1362         kprintf("%s at ", ifctx->ireq.ifr_name);
1363         print_sin_addr(&ifctx->myaddr);
1364         kprintf(" server ");
1365         print_in_addr(ifctx->reply.siaddr);
1366
1367         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1368         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1369                 kprintf(" via gateway ");
1370                 print_in_addr(ifctx->reply.giaddr);
1371         }
1372
1373         /* This call used for the side effect (overload flag) */
1374         (void) bootpc_tag(&gctx->tmptag,
1375                           &ifctx->reply, ifctx->replylen, TAG_END);
1376
1377         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1378                 if (ifctx->reply.sname[0] != '\0')
1379                         kprintf(" server name %s", ifctx->reply.sname);
1380         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1381                 if (ifctx->reply.file[0] != '\0')
1382                         kprintf(" boot file %s", ifctx->reply.file);
1383
1384         kprintf("\n");
1385
1386         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1387                        TAG_SUBNETMASK);
1388         if (p != NULL) {
1389                 if (gctx->tag.taglen != 4)
1390                         panic("bootpc: subnet mask len is %d",
1391                               gctx->tag.taglen);
1392                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1393                 ifctx->gotnetmask = 1;
1394                 kprintf("subnet mask ");
1395                 print_sin_addr(&ifctx->netmask);
1396                 kprintf(" ");
1397         }
1398
1399         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1400                        TAG_ROUTERS);
1401         if (p != NULL) {
1402                 /* Routers */
1403                 if (gctx->tag.taglen % 4)
1404                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1405                 if (gctx->tag.taglen > 0) {
1406                         bcopy(p, &ifctx->gw.sin_addr, 4);
1407                         kprintf("router ");
1408                         print_sin_addr(&ifctx->gw);
1409                         kprintf(" ");
1410                         ifctx->gotgw = 1;
1411                         gctx->gotgw = 1;
1412                 }
1413         }
1414
1415         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1416                        TAG_ROOT);
1417         if (p != NULL) {
1418                 if (gctx->setrootfs != NULL) {
1419                         kprintf("rootfs %s (ignored) ", p);
1420                 } else  if (setfs(&nd->root_saddr,
1421                                   nd->root_hostnam, p)) {
1422                         kprintf("rootfs %s ",p);
1423                         gctx->gotrootpath = 1;
1424                         ifctx->gotrootpath = 1;
1425                         gctx->setrootfs = ifctx;
1426
1427                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1428                                        ifctx->replylen,
1429                                        TAG_ROOTOPTS);
1430                         if (p != NULL) {
1431                                 nfs_mountopts(&nd->root_args, p);
1432                                 kprintf("rootopts %s ", p);
1433                         }
1434                 } else
1435                         panic("Failed to set rootfs to %s",p);
1436         }
1437
1438         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1439                        TAG_SWAP);
1440         if (p != NULL) {
1441                 if (gctx->setswapfs != NULL) {
1442                         kprintf("swapfs %s (ignored) ", p);
1443                 } else  if (setfs(&nd->swap_saddr,
1444                                   nd->swap_hostnam, p)) {
1445                         gctx->gotswappath = 1;
1446                         gctx->setswapfs = ifctx;
1447                         kprintf("swapfs %s ", p);
1448
1449                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1450                                        ifctx->replylen,
1451                                        TAG_SWAPOPTS);
1452                         if (p != NULL) {
1453                                 /* swap mount options */
1454                                 nfs_mountopts(&nd->swap_args, p);
1455                                 kprintf("swapopts %s ", p);
1456                         }
1457
1458                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1459                                        ifctx->replylen,
1460                                        TAG_SWAPSIZE);
1461                         if (p != NULL) {
1462                                 int swaplen;
1463                                 if (gctx->tag.taglen != 4)
1464                                         panic("bootpc: "
1465                                               "Expected 4 bytes for swaplen, "
1466                                               "not %d bytes",
1467                                               gctx->tag.taglen);
1468                                 bcopy(p, &swaplen, 4);
1469                                 nd->swap_nblks = ntohl(swaplen);
1470                                 kprintf("swapsize %d KB ",
1471                                        nd->swap_nblks);
1472                         }
1473                 } else
1474                         panic("Failed to set swapfs to %s", p);
1475         }
1476
1477         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1478                        TAG_HOSTNAME);
1479         if (p != NULL) {
1480                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1481                         panic("bootpc: hostname >= %d bytes",
1482                               MAXHOSTNAMELEN);
1483                 if (gctx->sethostname != NULL) {
1484                         kprintf("hostname %s (ignored) ", p);
1485                 } else {
1486                         strcpy(nd->my_hostnam, p);
1487                         strcpy(hostname, p);
1488                         kprintf("hostname %s ",hostname);
1489                         gctx->sethostname = ifctx;
1490                 }
1491         }
1492         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1493                        TAG_COOKIE);
1494         if (p != NULL) {        /* store in a sysctl variable */
1495                 int i, l = sizeof(bootp_cookie) - 1;
1496                 for (i = 0; i < l && p[i] != '\0'; i++)
1497                         bootp_cookie[i] = p[i];
1498                 p[i] = '\0';
1499         }
1500
1501         kprintf("\n");
1502
1503         if (ifctx->gotnetmask == 0) {
1504                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1505                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1506                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1507                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1508                 else
1509                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1510         }
1511         if (ifctx->gotgw == 0) {
1512                 /* Use proxyarp */
1513                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1514         }
1515 }
1516
1517 void
1518 bootpc_init(void)
1519 {
1520         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1521         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1522         struct ifnet *ifp;
1523         int error;
1524         struct nfsv3_diskless *nd;
1525         struct thread *td;
1526
1527         nd = &nfsv3_diskless;
1528         td = curthread;
1529
1530         /*
1531          * If already filled in, don't touch it here
1532          */
1533         if (nfs_diskless_valid != 0)
1534                 return;
1535
1536         gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1537
1538         gctx->xid = ~0xFFFF;
1539         gctx->starttime = time_uptime;
1540
1541         ifctx = allocifctx(gctx);
1542
1543         /*
1544          * Find a network interface.
1545          */
1546 #ifdef BOOTP_WIRED_TO
1547         kprintf("bootpc_init: wired to interface '%s'\n",
1548                __XSTRING(BOOTP_WIRED_TO));
1549 #endif
1550         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1551         /* XXX ALMOST MPSAFE */
1552         ifnet_lock();
1553         TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
1554                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1555                          sizeof(ifctx->ireq.ifr_name));
1556 #ifdef BOOTP_WIRED_TO
1557                 if (strcmp(ifctx->ireq.ifr_name,
1558                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1559                         continue;
1560 #else
1561                 if ((ifp->if_flags &
1562                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1563                     IFF_BROADCAST)
1564                         continue;
1565 #endif
1566                 if (gctx->interfaces != NULL)
1567                         gctx->lastinterface->next = ifctx;
1568                 else
1569                         gctx->interfaces = ifctx;
1570                 ifctx->ifp = ifp;
1571                 gctx->lastinterface = ifctx;
1572                 ifctx = allocifctx(gctx);
1573         }
1574         ifnet_unlock();
1575         kfree(ifctx, M_TEMP);
1576
1577         if (gctx->interfaces == NULL) {
1578 #ifdef BOOTP_WIRED_TO
1579                 panic("bootpc_init: Could not find interface specified "
1580                       "by BOOTP_WIRED_TO: "
1581                       __XSTRING(BOOTP_WIRED_TO));
1582 #else
1583                 panic("bootpc_init: no suitable interface");
1584 #endif
1585         }
1586
1587         gctx->gotrootpath = 0;
1588         gctx->gotswappath = 0;
1589         gctx->gotgw = 0;
1590
1591         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1592                 bootpc_fakeup_interface(ifctx, gctx, td);
1593
1594         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1595                 bootpc_compose_query(ifctx, gctx, td);
1596
1597         ifctx = gctx->interfaces;
1598         error = bootpc_call(gctx, td);
1599
1600         if (error != 0) {
1601 #ifdef BOOTP_NFSROOT
1602                 panic("BOOTP call failed");
1603 #else
1604                 kprintf("BOOTP call failed\n");
1605 #endif
1606         }
1607
1608         nfs_mountopts(&nd->root_args, NULL);
1609
1610         nfs_mountopts(&nd->swap_args, NULL);
1611
1612         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1613                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1614                         bootpc_decode_reply(nd, ifctx, gctx);
1615
1616         if (gctx->gotswappath == 0)
1617                 nd->swap_nblks = 0;
1618 #ifdef BOOTP_NFSROOT
1619         if (gctx->gotrootpath == 0)
1620                 panic("bootpc: No root path offered");
1621 #endif
1622
1623         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1624                 bootpc_adjust_interface(ifctx, gctx, td);
1625
1626                 soclose(ifctx->so, FNONBLOCK);
1627         }
1628
1629         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1630                 if (ifctx->gotrootpath != 0)
1631                         break;
1632         if (ifctx == NULL) {
1633                 for (ifctx = gctx->interfaces;
1634                      ifctx != NULL;
1635                      ifctx = ifctx->next)
1636                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1637                                 break;
1638         }
1639         if (ifctx == NULL)
1640                 goto out;
1641
1642         if (gctx->gotrootpath != 0) {
1643
1644                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1645                                  nd->root_fh, &nd->root_fhsize,
1646                                  &nd->root_args, td);
1647                 if (error != 0)
1648                         panic("nfs_boot: mountd root, error=%d", error);
1649
1650                 if (gctx->gotswappath != 0) {
1651
1652                         error = md_mount(&nd->swap_saddr,
1653                                          nd->swap_hostnam,
1654                                          nd->swap_fh, &nd->swap_fhsize,
1655                                          &nd->swap_args, td);
1656                         if (error != 0)
1657                                 panic("nfs_boot: mountd swap, error=%d",
1658                                       error);
1659
1660                         error = md_lookup_swap(&nd->swap_saddr,
1661                                                gctx->lookup_path,
1662                                                nd->swap_fh, &nd->swap_fhsize,
1663                                                &nd->swap_args, td);
1664                         if (error != 0)
1665                                 panic("nfs_boot: lookup swap, error=%d",
1666                                       error);
1667                 }
1668                 nfs_diskless_valid = 3;
1669         }
1670
1671         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1672         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1673         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1674         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1675                 ifctx->myaddr.sin_addr.s_addr |
1676                 ~ ifctx->netmask.sin_addr.s_addr;
1677         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1678
1679 out:
1680         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1681                 nctx = ifctx->next;
1682                 kfree(ifctx, M_TEMP);
1683         }
1684         kfree(gctx, M_TEMP);
1685 }
1686