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