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  * $DragonFly: src/sys/vfs/nfs/bootp_subr.c,v 1.26 2008/03/08 07:50:49 sephe Exp $
  42  */
  43
  44 #include "opt_bootp.h"
  45
  46 #include <sys/param.h>
  47 #include <sys/systm.h>
  48 #include <sys/kernel.h>
  49 #include <sys/sockio.h>
  50 #include <sys/proc.h>
  51 #include <sys/malloc.h>
  52 #include <sys/mount.h>
  53 #include <sys/mbuf.h>
  54 #include <sys/socket.h>
  55 #include <sys/socketvar.h>
  56 #include <sys/sysctl.h>
  57 #include <sys/uio.h>
  58 #include <sys/fcntl.h>
  59
  60 #include <net/if.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 extern struct nfsv3_diskless nfsv3_diskless;
 216 static char bootp_cookie[128];
 217 SYSCTL_STRING(_kern, OID_AUTO, bootp_cookie, CTLFLAG_RD,
 218         bootp_cookie, 0, "Cookie (T134) supplied by bootp server");
 219
 220 /* mountd RPC */
 221 static void print_in_addr(struct in_addr addr);
 222 static void print_sin_addr(struct sockaddr_in *addr);
 223 static void clear_sinaddr(struct sockaddr_in *sin);
 224 static
 225 struct bootpc_ifcontext *allocifctx(struct bootpc_globalcontext *gctx);
 226 static void bootpc_compose_query(struct bootpc_ifcontext *ifctx,
 227                                  struct bootpc_globalcontext *gctx,
 228                                  struct thread *td);
 229 static unsigned char *bootpc_tag(struct bootpc_tagcontext *tctx,
 230                                  struct bootp_packet *bp, int len, int tag);
 231 static void bootpc_tag_helper(struct bootpc_tagcontext *tctx,
 232                               unsigned char *start, int len, int tag);
 233
 234 #ifdef BOOTP_DEBUG
 235 void bootpboot_p_sa(struct sockaddr *sa,struct sockaddr *ma);
 236 void bootpboot_p_ma(struct sockaddr *ma);
 237 void bootpboot_p_rtentry(struct rtentry *rt);
 238 void bootpboot_p_tree(struct radix_node *rn);
 239 void bootpboot_p_rtlist(void);
 240 void bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa);
 241 void bootpboot_p_iflist(void);
 242 #endif
 243
 244 static int  bootpc_call(struct bootpc_globalcontext *gctx,
 245                         struct thread *td);
 246
 247 static int bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 248                                    struct bootpc_globalcontext *gctx,
 249                                    struct thread *td);
 250
 251 static int bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
 252                                    struct bootpc_globalcontext *gctx,
 253                                    struct thread *td);
 254
 255 static void bootpc_decode_reply(struct nfsv3_diskless *nd,
 256                                 struct bootpc_ifcontext *ifctx,
 257                                 struct bootpc_globalcontext *gctx);
 258
 259 static int bootpc_received(struct bootpc_globalcontext *gctx,
 260                            struct bootpc_ifcontext *ifctx);
 261
 262 static __inline int bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx);
 263 static __inline int bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx);
 264 static __inline int bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx);
 265
 266 void bootpc_init(void);
 267
 268 /*
 269  * In order to have multiple active interfaces with address 0.0.0.0
 270  * and be able to send data to a selected interface, we perform
 271  * some tricks:
 272  *
 273  *  - The 'broadcast' address is different for each interface.
 274  *
 275  *  - We temporarily add routing pointing 255.255.255.255 to the
 276  *    selected interface broadcast address, thus the packet sent
 277  *    goes to that interface.
 278  */
 279
 280 #ifdef BOOTP_DEBUG
 281 void
 282 bootpboot_p_sa(struct sockaddr *sa, struct sockaddr *ma)
 283 {
 284         if (sa == NULL) {
 285                 kprintf("(sockaddr *) <null>");
 286                 return;
 287         }
 288         switch (sa->sa_family) {
 289         case AF_INET:
 290         {
 291                 struct sockaddr_in *sin;
 292
 293                 sin = (struct sockaddr_in *) sa;
 294                 kprintf("inet ");
 295                 print_sin_addr(sin);
 296                 if (ma != NULL) {
 297                         sin = (struct sockaddr_in *) ma;
 298                         kprintf(" mask ");
 299                         print_sin_addr(sin);
 300                 }
 301         }
 302         break;
 303         case AF_LINK:
 304         {
 305                 struct sockaddr_dl *sli;
 306                 int i;
 307
 308                 sli = (struct sockaddr_dl *) sa;
 309                 kprintf("link %.*s ", sli->sdl_nlen, sli->sdl_data);
 310                 for (i = 0; i < sli->sdl_alen; i++) {
 311                         if (i > 0)
 312                                 kprintf(":");
 313                         kprintf("%x", ((unsigned char *) LLADDR(sli))[i]);
 314                 }
 315         }
 316         break;
 317         default:
 318                 kprintf("af%d", sa->sa_family);
 319         }
 320 }
 321
 322
 323 void
 324 bootpboot_p_ma(struct sockaddr *ma)
 325 {
 326         if (ma == NULL) {
 327                 kprintf("<null>");
 328                 return;
 329         }
 330         kprintf("%x", *(int *)ma);
 331 }
 332
 333
 334 void
 335 bootpboot_p_rtentry(struct rtentry *rt)
 336 {
 337         bootpboot_p_sa(rt_key(rt), rt_mask(rt));
 338         kprintf(" ");
 339         bootpboot_p_ma(rt->rt_genmask);
 340         kprintf(" ");
 341         bootpboot_p_sa(rt->rt_gateway, NULL);
 342         kprintf(" ");
 343         kprintf("flags %x", (unsigned short) rt->rt_flags);
 344         kprintf(" %d", (int) rt->rt_rmx.rmx_expire);
 345         kprintf(" %s\n", if_name(rt->rt_ifp));
 346 }
 347
 348
 349 void
 350 bootpboot_p_tree(struct radix_node *rn)
 351 {
 352         while (rn != NULL) {
 353                 if (rn->rn_bit < 0) {
 354                         if ((rn->rn_flags & RNF_ROOT) != 0) {
 355                         } else {
 356                                 bootpboot_p_rtentry((struct rtentry *) rn);
 357                         }
 358                         rn = rn->rn_dupedkey;
 359                 } else {
 360                         bootpboot_p_tree(rn->rn_left);
 361                         bootpboot_p_tree(rn->rn_right);
 362                         return;
 363                 }
 364         }
 365 }
 366
 367
 368 void
 369 bootpboot_p_rtlist(void)
 370 {
 371         kprintf("Routing table:\n");
 372         bootpboot_p_tree(rt_tables[AF_INET]->rnh_treetop);
 373 }
 374
 375
 376 void
 377 bootpboot_p_if(struct ifnet *ifp, struct ifaddr *ifa)
 378 {
 379         kprintf("%s flags %x, addr ",
 380                if_name(ifp),
 381                (unsigned short) ifp->if_flags);
 382         print_sin_addr((struct sockaddr_in *) ifa->ifa_addr);
 383         kprintf(", broadcast ");
 384         print_sin_addr((struct sockaddr_in *) ifa->ifa_dstaddr);
 385         kprintf(", netmask ");
 386         print_sin_addr((struct sockaddr_in *) ifa->ifa_netmask);
 387         kprintf("\n");
 388 }
 389
 390
 391 void
 392 bootpboot_p_iflist(void)
 393 {
 394         struct ifnet *ifp;
 395         struct ifaddr_container *ifac;
 396
 397         kprintf("Interface list:\n");
 398         TAILQ_FOREACH(ifp, &ifnet, 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 }
 407 #endif /* defined(BOOTP_DEBUG) */
 408
 409
 410 static void
 411 clear_sinaddr(struct sockaddr_in *sin)
 412 {
 413         bzero(sin, sizeof(*sin));
 414         sin->sin_len = sizeof(*sin);
 415         sin->sin_family = AF_INET;
 416         sin->sin_addr.s_addr = INADDR_ANY; /* XXX: htonl(INAADDR_ANY) ? */
 417         sin->sin_port = 0;
 418 }
 419
 420
 421 static struct bootpc_ifcontext *
 422 allocifctx(struct bootpc_globalcontext *gctx)
 423 {
 424         struct bootpc_ifcontext *ifctx;
 425         ifctx = (struct bootpc_ifcontext *) kmalloc(sizeof(*ifctx),
 426                                                    M_TEMP, M_WAITOK);
 427         bzero(ifctx, sizeof(*ifctx));
 428         ifctx->xid = gctx->xid;
 429 #ifdef BOOTP_NO_DHCP
 430         ifctx->state = IF_BOOTP_UNRESOLVED;
 431 #else
 432         ifctx->state = IF_DHCP_UNRESOLVED;
 433 #endif
 434         gctx->xid += 0x100;
 435         return ifctx;
 436 }
 437
 438
 439 static __inline int
 440 bootpc_ifctx_isresolved(struct bootpc_ifcontext *ifctx)
 441 {
 442         if (ifctx->state == IF_BOOTP_RESOLVED ||
 443             ifctx->state == IF_DHCP_RESOLVED)
 444                 return 1;
 445         return 0;
 446 }
 447
 448
 449 static __inline int
 450 bootpc_ifctx_isunresolved(struct bootpc_ifcontext *ifctx)
 451 {
 452         if (ifctx->state == IF_BOOTP_UNRESOLVED ||
 453             ifctx->state == IF_DHCP_UNRESOLVED)
 454                 return 1;
 455         return 0;
 456 }
 457
 458
 459 static __inline int
 460 bootpc_ifctx_isfailed(struct bootpc_ifcontext *ifctx)
 461 {
 462         if (ifctx->state == IF_BOOTP_FAILED ||
 463             ifctx->state == IF_DHCP_FAILED)
 464                 return 1;
 465         return 0;
 466 }
 467
 468
 469 static int
 470 bootpc_received(struct bootpc_globalcontext *gctx,
 471                 struct bootpc_ifcontext *ifctx)
 472 {
 473         unsigned char dhcpreplytype;
 474         char *p;
 475         /*
 476          * Need timeout for fallback to less
 477          * desirable alternative.
 478          */
 479
 480
 481         /* This call used for the side effect (badopt flag) */
 482         (void) bootpc_tag(&gctx->tmptag, &gctx->reply,
 483                           gctx->replylen,
 484                           TAG_END);
 485
 486         /* If packet is invalid, ignore it */
 487         if (gctx->tmptag.badopt != 0)
 488                 return 0;
 489
 490         p = bootpc_tag(&gctx->tmptag, &gctx->reply,
 491                        gctx->replylen, TAG_DHCP_MSGTYPE);
 492         if (p != NULL)
 493                 dhcpreplytype = *p;
 494         else
 495                 dhcpreplytype = DHCP_NOMSG;
 496
 497         switch (ifctx->dhcpquerytype) {
 498         case DHCP_DISCOVER:
 499                 if (dhcpreplytype != DHCP_OFFER         /* Normal DHCP offer */
 500 #ifndef BOOTP_FORCE_DHCP
 501                     && dhcpreplytype != DHCP_NOMSG      /* Fallback to BOOTP */
 502 #endif
 503                         )
 504                         return 0;
 505                 break;
 506         case DHCP_REQUEST:
 507                 if (dhcpreplytype != DHCP_ACK)
 508                         return 0;
 509                 /* fall through */
 510         case DHCP_NOMSG:
 511                 break;
 512         }
 513
 514
 515         /* Ignore packet unless it gives us a root tag we didn't have */
 516
 517         if ((ifctx->state == IF_BOOTP_RESOLVED ||
 518              (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 519               (ifctx->state == IF_DHCP_OFFERED ||
 520                ifctx->state == IF_DHCP_RESOLVED))) &&
 521             (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 522                         ifctx->replylen,
 523                         TAG_ROOT) != NULL ||
 524              bootpc_tag(&gctx->tmptag, &gctx->reply,
 525                         gctx->replylen,
 526                         TAG_ROOT) == NULL))
 527                 return 0;
 528
 529         bcopy(&gctx->reply,
 530               &ifctx->reply,
 531               gctx->replylen);
 532         ifctx->replylen = gctx->replylen;
 533
 534         /* XXX: Only reset if 'perfect' response */
 535         if (ifctx->state == IF_BOOTP_UNRESOLVED)
 536                 ifctx->state = IF_BOOTP_RESOLVED;
 537         else if (ifctx->state == IF_DHCP_UNRESOLVED &&
 538                  ifctx->dhcpquerytype == DHCP_DISCOVER) {
 539                 if (dhcpreplytype == DHCP_OFFER)
 540                         ifctx->state = IF_DHCP_OFFERED;
 541                 else
 542                         ifctx->state = IF_BOOTP_RESOLVED;       /* Fallback */
 543         } else if (ifctx->state == IF_DHCP_OFFERED &&
 544                    ifctx->dhcpquerytype == DHCP_REQUEST)
 545                 ifctx->state = IF_DHCP_RESOLVED;
 546
 547
 548         if (ifctx->dhcpquerytype == DHCP_DISCOVER &&
 549             ifctx->state != IF_BOOTP_RESOLVED) {
 550                 p = bootpc_tag(&gctx->tmptag, &ifctx->reply,
 551                                ifctx->replylen, TAG_DHCP_SERVERID);
 552                 if (p != NULL && gctx->tmptag.taglen == 4) {
 553                         memcpy(&ifctx->dhcpserver, p, 4);
 554                         ifctx->gotdhcpserver = 1;
 555                 } else
 556                         ifctx->gotdhcpserver = 0;
 557                 return 1;
 558         }
 559
 560         ifctx->gotrootpath = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 561                                          ifctx->replylen,
 562                                          TAG_ROOT) != NULL);
 563         ifctx->gotgw = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 564                                    ifctx->replylen,
 565                                    TAG_ROUTERS) != NULL);
 566         ifctx->gotnetmask = (bootpc_tag(&gctx->tmptag, &ifctx->reply,
 567                                         ifctx->replylen,
 568                                         TAG_SUBNETMASK) != NULL);
 569         return 1;
 570 }
 571
 572 static int
 573 bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
 574 {
 575         struct socket *so;
 576         struct sockaddr_in *sin, dst;
 577         struct uio auio;
 578         struct sockopt sopt;
 579         struct iovec aio;
 580         int error, on, rcvflg, timo, len;
 581         time_t atimo;
 582         time_t rtimo;
 583         struct timeval tv;
 584         struct bootpc_ifcontext *ifctx;
 585         int outstanding;
 586         int gotrootpath;
 587         int retry;
 588         const char *s;
 589
 590         /*
 591          * Create socket and set its recieve timeout.
 592          */
 593         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
 594         if (error != 0)
 595                 goto out;
 596
 597         tv.tv_sec = 1;
 598         tv.tv_usec = 0;
 599         bzero(&sopt, sizeof(sopt));
 600         sopt.sopt_level = SOL_SOCKET;
 601         sopt.sopt_name = SO_RCVTIMEO;
 602         sopt.sopt_val = &tv;
 603         sopt.sopt_valsize = sizeof tv;
 604
 605         error = sosetopt(so, &sopt);
 606         if (error != 0)
 607                 goto out;
 608
 609         /*
 610          * Enable broadcast.
 611          */
 612         on = 1;
 613         sopt.sopt_name = SO_BROADCAST;
 614         sopt.sopt_val = &on;
 615         sopt.sopt_valsize = sizeof on;
 616
 617         error = sosetopt(so, &sopt);
 618         if (error != 0)
 619                 goto out;
 620
 621         /*
 622          * Disable routing.
 623          */
 624
 625         on = 1;
 626         sopt.sopt_name = SO_DONTROUTE;
 627         sopt.sopt_val = &on;
 628         sopt.sopt_valsize = sizeof on;
 629
 630         error = sosetopt(so, &sopt);
 631         if (error != 0)
 632                 goto out;
 633
 634         /*
 635          * Bind the local endpoint to a bootp client port.
 636          */
 637         sin = &dst;
 638         clear_sinaddr(sin);
 639         sin->sin_port = htons(IPPORT_BOOTPC);
 640         error = sobind(so, (struct sockaddr *)sin, td);
 641         if (error != 0) {
 642                 kprintf("bind failed\n");
 643                 goto out;
 644         }
 645
 646         /*
 647          * Setup socket address for the server.
 648          */
 649         sin = &dst;
 650         clear_sinaddr(sin);
 651         sin->sin_addr.s_addr = INADDR_BROADCAST;
 652         sin->sin_port = htons(IPPORT_BOOTPS);
 653
 654         /*
 655          * Send it, repeatedly, until a reply is received,
 656          * but delay each re-send by an increasing amount.
 657          * If the delay hits the maximum, start complaining.
 658          */
 659         timo = 0;
 660         rtimo = 0;
 661         for (;;) {
 662
 663                 outstanding = 0;
 664                 gotrootpath = 0;
 665
 666                 for (ifctx = gctx->interfaces;
 667                      ifctx != NULL;
 668                      ifctx = ifctx->next) {
 669                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
 670                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
 671                                        ifctx->replylen,
 672                                        TAG_ROOT) != NULL)
 673                                 gotrootpath = 1;
 674                 }
 675
 676                 for (ifctx = gctx->interfaces;
 677                      ifctx != NULL;
 678                      ifctx = ifctx->next) {
 679                         ifctx->outstanding = 0;
 680                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
 681                             gotrootpath != 0) {
 682                                 continue;
 683                         }
 684                         if (bootpc_ifctx_isfailed(ifctx) != 0)
 685                                 continue;
 686
 687                         outstanding++;
 688                         ifctx->outstanding = 1;
 689
 690                         /* Proceed to next step in DHCP negotiation */
 691                         if ((ifctx->state == IF_DHCP_OFFERED &&
 692                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
 693                             (ifctx->state == IF_DHCP_UNRESOLVED &&
 694                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
 695                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
 696                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
 697                                 ifctx->sentmsg = 0;
 698                                 bootpc_compose_query(ifctx, gctx, td);
 699                         }
 700
 701                         /* Send BOOTP request (or re-send). */
 702
 703                         if (ifctx->sentmsg == 0) {
 704                                 switch(ifctx->dhcpquerytype) {
 705                                 case DHCP_DISCOVER:
 706                                         s = "DHCP Discover";
 707                                         break;
 708                                 case DHCP_REQUEST:
 709                                         s = "DHCP Request";
 710                                         break;
 711                                 case DHCP_NOMSG:
 712                                 default:
 713                                         s = "BOOTP Query";
 714                                         break;
 715                                 }
 716                                 kprintf("Sending %s packet from "
 717                                        "interface %s (%*D)\n",
 718                                        s,
 719                                        ifctx->ireq.ifr_name,
 720                                        ifctx->sdl->sdl_alen,
 721                                        (unsigned char *) LLADDR(ifctx->sdl),
 722                                        ":");
 723                                 ifctx->sentmsg = 1;
 724                         }
 725
 726                         aio.iov_base = (caddr_t) &ifctx->call;
 727                         aio.iov_len = sizeof(ifctx->call);
 728
 729                         auio.uio_iov = &aio;
 730                         auio.uio_iovcnt = 1;
 731                         auio.uio_segflg = UIO_SYSSPACE;
 732                         auio.uio_rw = UIO_WRITE;
 733                         auio.uio_offset = 0;
 734                         auio.uio_resid = sizeof(ifctx->call);
 735                         auio.uio_td = td;
 736
 737                         /* Set netmask to 0.0.0.0 */
 738
 739                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 740                         clear_sinaddr(sin);
 741                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 742                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
 743                         if (error != 0)
 744                                 panic("bootpc_call:"
 745                                       "set if netmask, error=%d",
 746                                       error);
 747
 748                         error = sosend(so, (struct sockaddr *) &dst,
 749                                        &auio, NULL, NULL, 0, td);
 750                         if (error != 0) {
 751                                 kprintf("bootpc_call: sosend: %d state %08x\n",
 752                                        error, (int) so->so_state);
 753                         }
 754
 755                         /* XXX: Is this needed ? */
 756                         tsleep(&error, 0, "bootpw", 10);
 757
 758                         /* Set netmask to 255.0.0.0 */
 759
 760                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 761                         clear_sinaddr(sin);
 762                         sin->sin_addr.s_addr = htonl(0xff000000u);
 763                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 764                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
 765                         if (error != 0)
 766                                 panic("bootpc_call:"
 767                                       "set if netmask, error=%d",
 768                                       error);
 769
 770                 }
 771
 772                 if (outstanding == 0 &&
 773                     (rtimo == 0 || time_second >= rtimo)) {
 774                         error = 0;
 775                         goto gotreply;
 776                 }
 777
 778                 /* Determine new timeout. */
 779                 if (timo < MAX_RESEND_DELAY)
 780                         timo++;
 781                 else {
 782                         kprintf("DHCP/BOOTP timeout for server ");
 783                         print_sin_addr(&dst);
 784                         kprintf("\n");
 785                 }
 786
 787                 /*
 788                  * Wait for up to timo seconds for a reply.
 789                  * The socket receive timeout was set to 1 second.
 790                  */
 791                 atimo = timo + time_second;
 792                 while (time_second < atimo) {
 793                         aio.iov_base = (caddr_t) &gctx->reply;
 794                         aio.iov_len = sizeof(gctx->reply);
 795
 796                         auio.uio_iov = &aio;
 797                         auio.uio_iovcnt = 1;
 798                         auio.uio_segflg = UIO_SYSSPACE;
 799                         auio.uio_rw = UIO_READ;
 800                         auio.uio_offset = 0;
 801                         auio.uio_resid = sizeof(gctx->reply);
 802                         auio.uio_td = td;
 803
 804                         rcvflg = 0;
 805                         error = soreceive(so, NULL, &auio,
 806                                           NULL, NULL, &rcvflg);
 807                         gctx->secs = time_second - gctx->starttime;
 808                         for (ifctx = gctx->interfaces;
 809                              ifctx != NULL;
 810                              ifctx = ifctx->next) {
 811                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
 812                                     bootpc_ifctx_isfailed(ifctx) != 0)
 813                                         continue;
 814
 815                                 ifctx->call.secs = htons(gctx->secs);
 816                         }
 817                         if (error == EWOULDBLOCK)
 818                                 continue;
 819                         if (error != 0)
 820                                 goto out;
 821                         len = sizeof(gctx->reply) - auio.uio_resid;
 822
 823                         /* Do we have the required number of bytes ? */
 824                         if (len < BOOTP_MIN_LEN)
 825                                 continue;
 826                         gctx->replylen = len;
 827
 828                         /* Is it a reply? */
 829                         if (gctx->reply.op != BOOTP_REPLY)
 830                                 continue;
 831
 832                         /* Is this an answer to our query */
 833                         for (ifctx = gctx->interfaces;
 834                              ifctx != NULL;
 835                              ifctx = ifctx->next) {
 836                                 if (gctx->reply.xid != ifctx->call.xid)
 837                                         continue;
 838
 839                                 /* Same HW address size ? */
 840                                 if (gctx->reply.hlen != ifctx->call.hlen)
 841                                         continue;
 842
 843                                 /* Correct HW address ? */
 844                                 if (bcmp(gctx->reply.chaddr,
 845                                          ifctx->call.chaddr,
 846                                          ifctx->call.hlen) != 0)
 847                                         continue;
 848
 849                                 break;
 850                         }
 851
 852                         if (ifctx != NULL) {
 853                                 s =  bootpc_tag(&gctx->tmptag,
 854                                                 &gctx->reply,
 855                                                 gctx->replylen,
 856                                                 TAG_DHCP_MSGTYPE);
 857                                 if (s != NULL) {
 858                                         switch (*s) {
 859                                         case DHCP_OFFER:
 860                                                 s = "DHCP Offer";
 861                                                 break;
 862                                         case DHCP_ACK:
 863                                                 s = "DHCP Ack";
 864                                                 break;
 865                                         default:
 866                                                 s = "DHCP (unexpected)";
 867                                                 break;
 868                                         }
 869                                 } else
 870                                         s = "BOOTP Reply";
 871
 872                                 kprintf("Received %s packet"
 873                                        " on %s from ",
 874                                        s,
 875                                        ifctx->ireq.ifr_name);
 876                                 print_in_addr(gctx->reply.siaddr);
 877                                 if (gctx->reply.giaddr.s_addr !=
 878                                     htonl(INADDR_ANY)) {
 879                                         kprintf(" via ");
 880                                         print_in_addr(gctx->reply.giaddr);
 881                                 }
 882                                 if (bootpc_received(gctx, ifctx) != 0) {
 883                                         kprintf(" (accepted)");
 884                                         if (ifctx->outstanding) {
 885                                                 ifctx->outstanding = 0;
 886                                                 outstanding--;
 887                                         }
 888                                         /* Network settle delay */
 889                                         if (outstanding == 0)
 890                                                 atimo = time_second +
 891                                                         BOOTP_SETTLE_DELAY;
 892                                 } else
 893                                         kprintf(" (ignored)");
 894                                 if (ifctx->gotrootpath) {
 895                                         gotrootpath = 1;
 896                                         rtimo = time_second +
 897                                                 BOOTP_SETTLE_DELAY;
 898                                         kprintf(" (got root path)");
 899                                 } else
 900                                         kprintf(" (no root path)");
 901                                 kprintf("\n");
 902                         }
 903                 } /* while secs */
 904 #ifdef BOOTP_TIMEOUT
 905                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
 906                         break;
 907 #endif
 908                 /* Force a retry if halfway in DHCP negotiation */
 909                 retry = 0;
 910                 for (ifctx = gctx->interfaces; ifctx != NULL;
 911                      ifctx = ifctx->next) {
 912                         if (ifctx->state == IF_DHCP_OFFERED) {
 913                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
 914                                         retry = 1;
 915                                 else
 916                                         ifctx->state = IF_DHCP_UNRESOLVED;
 917                         }
 918                 }
 919
 920                 if (retry != 0)
 921                         continue;
 922
 923                 if (gotrootpath != 0) {
 924                         gctx->gotrootpath = gotrootpath;
 925                         if (rtimo != 0 && time_second >= rtimo)
 926                                 break;
 927                 }
 928         } /* forever send/receive */
 929
 930         /*
 931          * XXX: These are errors of varying seriousness being silently
 932          * ignored
 933          */
 934
 935         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 936                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
 937                         kprintf("%s timeout for interface %s\n",
 938                                ifctx->dhcpquerytype != DHCP_NOMSG ?
 939                                "DHCP" : "BOOTP",
 940                                ifctx->ireq.ifr_name);
 941                 }
 942         }
 943         if (gctx->gotrootpath != 0) {
 944 #if 0
 945                 kprintf("Got a root path, ignoring remaining timeout\n");
 946 #endif
 947                 error = 0;
 948                 goto out;
 949         }
 950 #ifndef BOOTP_NFSROOT
 951         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 952                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
 953                         error = 0;
 954                         goto out;
 955                 }
 956         }
 957 #endif
 958         error = ETIMEDOUT;
 959         goto out;
 960
 961 gotreply:
 962 out:
 963         soclose(so, FNONBLOCK);
 964         return error;
 965 }
 966
 967
 968 static int
 969 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 970                         struct bootpc_globalcontext *gctx,
 971                         struct thread *td)
 972 {
 973         struct ifaddr_container *ifac;
 974         struct sockaddr_in *sin;
 975         int error;
 976
 977         struct ifreq *ireq;
 978         struct socket *so;
 979         struct sockaddr_dl *sdl;
 980
 981         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
 982         if (error != 0)
 983                 panic("nfs_boot: socreate, error=%d", error);
 984
 985         ireq = &ifctx->ireq;
 986         so = ifctx->so;
 987
 988         /*
 989          * Bring up the interface.
 990          *
 991          * Get the old interface flags and or IFF_UP into them; if
 992          * IFF_UP set blindly, interface selection can be clobbered.
 993          */
 994         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
 995         if (error != 0)
 996                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
 997         ireq->ifr_flags |= IFF_UP;
 998         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
 999         if (error != 0)
1000                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1001
1002         /*
1003          * Do enough of ifconfig(8) so that the chosen interface
1004          * can talk to the servers.  (just set the address)
1005          */
1006
1007         /* addr is 0.0.0.0 */
1008
1009         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1010         clear_sinaddr(sin);
1011         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1012         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1013                 panic("bootpc_fakeup_interface: "
1014                       "set if addr, error=%d", error);
1015
1016         /* netmask is 255.0.0.0 */
1017
1018         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1019         clear_sinaddr(sin);
1020         sin->sin_addr.s_addr = htonl(0xff000000u);
1021         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1022         if (error != 0)
1023                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1024                       error);
1025
1026         /* Broadcast is 255.255.255.255 */
1027
1028         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1029         clear_sinaddr(sin);
1030         clear_sinaddr(&ifctx->broadcast);
1031         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1032         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1033
1034         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1035         if (error != 0 && error != EADDRNOTAVAIL)
1036                 panic("bootpc_fakeup_interface: "
1037                       "set if broadcast addr, error=%d",
1038                       error);
1039         error = 0;
1040
1041         /* Get HW address */
1042
1043         sdl = NULL;
1044         TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1045                 struct ifaddr *ifa = ifac->ifa;
1046
1047                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1048                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1049                     sdl->sdl_type == IFT_ETHER)
1050                         break;
1051         }
1052
1053         if (sdl == NULL)
1054                 panic("bootpc: Unable to find HW address for %s",
1055                       ifctx->ireq.ifr_name);
1056         ifctx->sdl = sdl;
1057
1058         return error;
1059 }
1060
1061
1062 static int
1063 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1064                         struct bootpc_globalcontext *gctx,
1065                         struct thread *td)
1066 {
1067         int error;
1068         struct sockaddr_in defdst;
1069         struct sockaddr_in defmask;
1070         struct sockaddr_in *sin;
1071
1072         struct ifreq *ireq;
1073         struct socket *so;
1074         struct sockaddr_in *myaddr;
1075         struct sockaddr_in *netmask;
1076         struct sockaddr_in *gw;
1077
1078         ireq = &ifctx->ireq;
1079         so = ifctx->so;
1080         myaddr = &ifctx->myaddr;
1081         netmask = &ifctx->netmask;
1082         gw = &ifctx->gw;
1083
1084         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1085
1086                 /* Shutdown interfaces where BOOTP failed */
1087
1088                 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1089                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1090                 if (error != 0)
1091                         panic("bootpc_adjust_interface: "
1092                               "SIOCGIFFLAGS, error=%d", error);
1093                 ireq->ifr_flags &= ~IFF_UP;
1094                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1095                 if (error != 0)
1096                         panic("bootpc_adjust_interface: "
1097                               "SIOCSIFFLAGS, error=%d", error);
1098
1099                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1100                 clear_sinaddr(sin);
1101                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1102                 if (error != 0 && (error != EADDRNOTAVAIL ||
1103                                    ifctx == gctx->interfaces))
1104                         panic("bootpc_adjust_interface: "
1105                               "SIOCDIFADDR, error=%d", error);
1106
1107                 return 0;
1108         }
1109
1110         kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1111         /*
1112          * Do enough of ifconfig(8) so that the chosen interface
1113          * can talk to the servers.  (just set the address)
1114          */
1115         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1116         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1117         if (error != 0)
1118                 panic("bootpc_adjust_interface: "
1119                       "set if netmask, error=%d", error);
1120
1121         /* Broadcast is with host part of IP address all 1's */
1122
1123         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1124         clear_sinaddr(sin);
1125         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1126                 ~ netmask->sin_addr.s_addr;
1127         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1128         if (error != 0)
1129                 panic("bootpc_adjust_interface: "
1130                       "set if broadcast addr, error=%d", error);
1131
1132         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1133         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1134         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1135                 panic("bootpc_adjust_interface: "
1136                       "set if addr, error=%d", error);
1137
1138         /* Add new default route */
1139
1140         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1141                 clear_sinaddr(&defdst);
1142                 clear_sinaddr(&defmask);
1143                 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1144                                          (struct sockaddr *) gw,
1145                                          (struct sockaddr *) &defmask,
1146                                          (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1147                 if (error != 0) {
1148                         kprintf("bootpc_adjust_interface: "
1149                                "add net route, error=%d\n", error);
1150                         return error;
1151                 }
1152         }
1153
1154         return 0;
1155 }
1156
1157 static void
1158 print_sin_addr(struct sockaddr_in *sin)
1159 {
1160         print_in_addr(sin->sin_addr);
1161 }
1162
1163
1164 static void
1165 print_in_addr(struct in_addr addr)
1166 {
1167         unsigned int ip;
1168
1169         ip = ntohl(addr.s_addr);
1170         kprintf("%d.%d.%d.%d",
1171                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1172 }
1173
1174 static void
1175 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1176                      struct bootpc_globalcontext *gctx, struct thread *td)
1177 {
1178         unsigned char *vendp;
1179         unsigned char vendor_client[64];
1180         uint32_t leasetime;
1181         uint8_t vendor_client_len;
1182
1183         ifctx->gotrootpath = 0;
1184
1185         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1186
1187         /* bootpc part */
1188         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1189         ifctx->call.htype = 1;                  /* 10mb ethernet */
1190         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1191         ifctx->call.hops = 0;
1192         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1193                 ifctx->xid++;
1194         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1195         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1196
1197         vendp = ifctx->call.vend;
1198         *vendp++ = 99;          /* RFC1048 cookie */
1199         *vendp++ = 130;
1200         *vendp++ = 83;
1201         *vendp++ = 99;
1202         *vendp++ = TAG_MAXMSGSIZE;
1203         *vendp++ = 2;
1204         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1205         *vendp++ = sizeof(struct bootp_packet) & 255;
1206
1207         ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1208                 ostype, MACHINE, osrelease);
1209         vendor_client_len = strlen(vendor_client);
1210         *vendp++ = TAG_VENDOR_INDENTIFIER;
1211         *vendp++ = vendor_client_len;
1212         memcpy(vendp, vendor_client, vendor_client_len);
1213         vendp += vendor_client_len;
1214         ifctx->dhcpquerytype = DHCP_NOMSG;
1215         switch (ifctx->state) {
1216         case IF_DHCP_UNRESOLVED:
1217                 *vendp++ = TAG_DHCP_MSGTYPE;
1218                 *vendp++ = 1;
1219                 *vendp++ = DHCP_DISCOVER;
1220                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1221                 ifctx->gotdhcpserver = 0;
1222                 break;
1223         case IF_DHCP_OFFERED:
1224                 *vendp++ = TAG_DHCP_MSGTYPE;
1225                 *vendp++ = 1;
1226                 *vendp++ = DHCP_REQUEST;
1227                 ifctx->dhcpquerytype = DHCP_REQUEST;
1228                 *vendp++ = TAG_DHCP_REQ_ADDR;
1229                 *vendp++ = 4;
1230                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1231                 vendp += 4;
1232                 if (ifctx->gotdhcpserver != 0) {
1233                         *vendp++ = TAG_DHCP_SERVERID;
1234                         *vendp++ = 4;
1235                         memcpy(vendp, &ifctx->dhcpserver, 4);
1236                         vendp += 4;
1237                 }
1238                 *vendp++ = TAG_DHCP_LEASETIME;
1239                 *vendp++ = 4;
1240                 leasetime = htonl(300);
1241                 memcpy(vendp, &leasetime, 4);
1242                 vendp += 4;
1243         default:
1244                 ;
1245         }
1246         *vendp = TAG_END;
1247
1248         ifctx->call.secs = 0;
1249         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1250 }
1251
1252
1253 static int
1254 bootpc_hascookie(struct bootp_packet *bp)
1255 {
1256         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1257                 bp->vend[2] == 83 && bp->vend[3] == 99);
1258 }
1259
1260
1261 static void
1262 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1263                   unsigned char *start, int len, int tag)
1264 {
1265         unsigned char *j;
1266         unsigned char *ej;
1267         unsigned char code;
1268
1269         if (tctx->badtag != 0 || tctx->badopt != 0)
1270                 return;
1271
1272         j = start;
1273         ej = j + len;
1274
1275         while (j < ej) {
1276                 code = *j++;
1277                 if (code == TAG_PAD)
1278                         continue;
1279                 if (code == TAG_END)
1280                         return;
1281                 if (j >= ej || j + *j + 1 > ej) {
1282                         tctx->badopt = 1;
1283                         return;
1284                 }
1285                 len = *j++;
1286                 if (code == tag) {
1287                         if (tctx->taglen + len > TAG_MAXLEN) {
1288                                 tctx->badtag = 1;
1289                                 return;
1290                         }
1291                         tctx->foundopt = 1;
1292                         if (len > 0)
1293                                 memcpy(tctx->buf + tctx->taglen,
1294                                        j, len);
1295                         tctx->taglen += len;
1296                 }
1297                 if (code == TAG_OVERLOAD)
1298                         tctx->overload = *j;
1299
1300                 j += len;
1301         }
1302 }
1303
1304
1305 static unsigned char *
1306 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1307            int len, int tag)
1308 {
1309         unsigned char *j;
1310         unsigned char *ej;
1311
1312         tctx->overload = 0;
1313         tctx->badopt = 0;
1314         tctx->badtag = 0;
1315         tctx->foundopt = 0;
1316         tctx->taglen = 0;
1317
1318         if (bootpc_hascookie(bp) == 0)
1319                 return NULL;
1320
1321         j = &bp->vend[4];
1322         ej = (unsigned char *) bp + len;
1323
1324         bootpc_tag_helper(tctx, &bp->vend[4],
1325                           (unsigned char *) bp + len - &bp->vend[4], tag);
1326
1327         if ((tctx->overload & OVERLOAD_FILE) != 0)
1328                 bootpc_tag_helper(tctx,
1329                                   (unsigned char *) bp->file,
1330                                   sizeof(bp->file),
1331                                   tag);
1332         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1333                 bootpc_tag_helper(tctx,
1334                                   (unsigned char *) bp->sname,
1335                                   sizeof(bp->sname),
1336                                   tag);
1337
1338         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1339                 return NULL;
1340         tctx->buf[tctx->taglen] = '\0';
1341         return tctx->buf;
1342 }
1343
1344
1345 static void
1346 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1347                     struct bootpc_globalcontext *gctx)
1348 {
1349         char *p;
1350         unsigned int ip;
1351
1352         ifctx->gotgw = 0;
1353         ifctx->gotnetmask = 0;
1354
1355         clear_sinaddr(&ifctx->myaddr);
1356         clear_sinaddr(&ifctx->netmask);
1357         clear_sinaddr(&ifctx->gw);
1358
1359         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1360
1361         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1362         ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1363                  "swap.%d.%d.%d.%d",
1364                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1365
1366         kprintf("%s at ", ifctx->ireq.ifr_name);
1367         print_sin_addr(&ifctx->myaddr);
1368         kprintf(" server ");
1369         print_in_addr(ifctx->reply.siaddr);
1370
1371         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1372         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1373                 kprintf(" via gateway ");
1374                 print_in_addr(ifctx->reply.giaddr);
1375         }
1376
1377         /* This call used for the side effect (overload flag) */
1378         (void) bootpc_tag(&gctx->tmptag,
1379                           &ifctx->reply, ifctx->replylen, TAG_END);
1380
1381         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1382                 if (ifctx->reply.sname[0] != '\0')
1383                         kprintf(" server name %s", ifctx->reply.sname);
1384         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1385                 if (ifctx->reply.file[0] != '\0')
1386                         kprintf(" boot file %s", ifctx->reply.file);
1387
1388         kprintf("\n");
1389
1390         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1391                        TAG_SUBNETMASK);
1392         if (p != NULL) {
1393                 if (gctx->tag.taglen != 4)
1394                         panic("bootpc: subnet mask len is %d",
1395                               gctx->tag.taglen);
1396                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1397                 ifctx->gotnetmask = 1;
1398                 kprintf("subnet mask ");
1399                 print_sin_addr(&ifctx->netmask);
1400                 kprintf(" ");
1401         }
1402
1403         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1404                        TAG_ROUTERS);
1405         if (p != NULL) {
1406                 /* Routers */
1407                 if (gctx->tag.taglen % 4)
1408                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1409                 if (gctx->tag.taglen > 0) {
1410                         bcopy(p, &ifctx->gw.sin_addr, 4);
1411                         kprintf("router ");
1412                         print_sin_addr(&ifctx->gw);
1413                         kprintf(" ");
1414                         ifctx->gotgw = 1;
1415                         gctx->gotgw = 1;
1416                 }
1417         }
1418
1419         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1420                        TAG_ROOT);
1421         if (p != NULL) {
1422                 if (gctx->setrootfs != NULL) {
1423                         kprintf("rootfs %s (ignored) ", p);
1424                 } else  if (setfs(&nd->root_saddr,
1425                                   nd->root_hostnam, p)) {
1426                         kprintf("rootfs %s ",p);
1427                         gctx->gotrootpath = 1;
1428                         ifctx->gotrootpath = 1;
1429                         gctx->setrootfs = ifctx;
1430
1431                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1432                                        ifctx->replylen,
1433                                        TAG_ROOTOPTS);
1434                         if (p != NULL) {
1435                                 mountopts(&nd->root_args, p);
1436                                 kprintf("rootopts %s ", p);
1437                         }
1438                 } else
1439                         panic("Failed to set rootfs to %s",p);
1440         }
1441
1442         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1443                        TAG_SWAP);
1444         if (p != NULL) {
1445                 if (gctx->setswapfs != NULL) {
1446                         kprintf("swapfs %s (ignored) ", p);
1447                 } else  if (setfs(&nd->swap_saddr,
1448                                   nd->swap_hostnam, p)) {
1449                         gctx->gotswappath = 1;
1450                         gctx->setswapfs = ifctx;
1451                         kprintf("swapfs %s ", p);
1452
1453                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1454                                        ifctx->replylen,
1455                                        TAG_SWAPOPTS);
1456                         if (p != NULL) {
1457                                 /* swap mount options */
1458                                 mountopts(&nd->swap_args, p);
1459                                 kprintf("swapopts %s ", p);
1460                         }
1461
1462                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1463                                        ifctx->replylen,
1464                                        TAG_SWAPSIZE);
1465                         if (p != NULL) {
1466                                 int swaplen;
1467                                 if (gctx->tag.taglen != 4)
1468                                         panic("bootpc: "
1469                                               "Expected 4 bytes for swaplen, "
1470                                               "not %d bytes",
1471                                               gctx->tag.taglen);
1472                                 bcopy(p, &swaplen, 4);
1473                                 nd->swap_nblks = ntohl(swaplen);
1474                                 kprintf("swapsize %d KB ",
1475                                        nd->swap_nblks);
1476                         }
1477                 } else
1478                         panic("Failed to set swapfs to %s", p);
1479         }
1480
1481         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1482                        TAG_HOSTNAME);
1483         if (p != NULL) {
1484                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1485                         panic("bootpc: hostname >= %d bytes",
1486                               MAXHOSTNAMELEN);
1487                 if (gctx->sethostname != NULL) {
1488                         kprintf("hostname %s (ignored) ", p);
1489                 } else {
1490                         strcpy(nd->my_hostnam, p);
1491                         strcpy(hostname, p);
1492                         kprintf("hostname %s ",hostname);
1493                         gctx->sethostname = ifctx;
1494                 }
1495         }
1496         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1497                        TAG_COOKIE);
1498         if (p != NULL) {        /* store in a sysctl variable */
1499                 int i, l = sizeof(bootp_cookie) - 1;
1500                 for (i = 0; i < l && p[i] != '\0'; i++)
1501                         bootp_cookie[i] = p[i];
1502                 p[i] = '\0';
1503         }
1504
1505         kprintf("\n");
1506
1507         if (ifctx->gotnetmask == 0) {
1508                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1509                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1510                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1511                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1512                 else
1513                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1514         }
1515         if (ifctx->gotgw == 0) {
1516                 /* Use proxyarp */
1517                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1518         }
1519 }
1520
1521 void
1522 bootpc_init(void)
1523 {
1524         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1525         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1526         struct ifnet *ifp;
1527         int error;
1528         struct nfsv3_diskless *nd;
1529         struct thread *td;
1530
1531         nd = &nfsv3_diskless;
1532         td = curthread;
1533
1534         /*
1535          * If already filled in, don't touch it here
1536          */
1537         if (nfs_diskless_valid != 0)
1538                 return;
1539
1540         /*
1541          * Wait until arp entries can be handled.
1542          */
1543         while (time_second == 0)
1544                 tsleep(&time_second, 0, "arpkludge", 10);
1545
1546         gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1547
1548         gctx->xid = ~0xFFFF;
1549         gctx->starttime = time_second;
1550
1551         ifctx = allocifctx(gctx);
1552
1553         /*
1554          * Find a network interface.
1555          */
1556 #ifdef BOOTP_WIRED_TO
1557         kprintf("bootpc_init: wired to interface '%s'\n",
1558                __XSTRING(BOOTP_WIRED_TO));
1559 #endif
1560         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1561         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1562                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1563                          sizeof(ifctx->ireq.ifr_name));
1564 #ifdef BOOTP_WIRED_TO
1565                 if (strcmp(ifctx->ireq.ifr_name,
1566                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1567                         continue;
1568 #else
1569                 if ((ifp->if_flags &
1570                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1571                     IFF_BROADCAST)
1572                         continue;
1573 #endif
1574                 if (gctx->interfaces != NULL)
1575                         gctx->lastinterface->next = ifctx;
1576                 else
1577                         gctx->interfaces = ifctx;
1578                 ifctx->ifp = ifp;
1579                 gctx->lastinterface = ifctx;
1580                 ifctx = allocifctx(gctx);
1581         }
1582         kfree(ifctx, M_TEMP);
1583
1584         if (gctx->interfaces == NULL) {
1585 #ifdef BOOTP_WIRED_TO
1586                 panic("bootpc_init: Could not find interface specified "
1587                       "by BOOTP_WIRED_TO: "
1588                       __XSTRING(BOOTP_WIRED_TO));
1589 #else
1590                 panic("bootpc_init: no suitable interface");
1591 #endif
1592         }
1593
1594         gctx->gotrootpath = 0;
1595         gctx->gotswappath = 0;
1596         gctx->gotgw = 0;
1597
1598         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1599                 bootpc_fakeup_interface(ifctx, gctx, td);
1600
1601         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1602                 bootpc_compose_query(ifctx, gctx, td);
1603
1604         ifctx = gctx->interfaces;
1605         error = bootpc_call(gctx, td);
1606
1607         if (error != 0) {
1608 #ifdef BOOTP_NFSROOT
1609                 panic("BOOTP call failed");
1610 #else
1611                 kprintf("BOOTP call failed\n");
1612 #endif
1613         }
1614
1615         mountopts(&nd->root_args, NULL);
1616
1617         mountopts(&nd->swap_args, NULL);
1618
1619         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1620                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1621                         bootpc_decode_reply(nd, ifctx, gctx);
1622
1623         if (gctx->gotswappath == 0)
1624                 nd->swap_nblks = 0;
1625 #ifdef BOOTP_NFSROOT
1626         if (gctx->gotrootpath == 0)
1627                 panic("bootpc: No root path offered");
1628 #endif
1629
1630         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1631                 bootpc_adjust_interface(ifctx, gctx, td);
1632
1633                 soclose(ifctx->so, FNONBLOCK);
1634         }
1635
1636         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1637                 if (ifctx->gotrootpath != 0)
1638                         break;
1639         if (ifctx == NULL) {
1640                 for (ifctx = gctx->interfaces;
1641                      ifctx != NULL;
1642                      ifctx = ifctx->next)
1643                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1644                                 break;
1645         }
1646         if (ifctx == NULL)
1647                 goto out;
1648
1649         if (gctx->gotrootpath != 0) {
1650
1651                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1652                                  nd->root_fh, &nd->root_fhsize,
1653                                  &nd->root_args, td);
1654                 if (error != 0)
1655                         panic("nfs_boot: mountd root, error=%d", error);
1656
1657                 if (gctx->gotswappath != 0) {
1658
1659                         error = md_mount(&nd->swap_saddr,
1660                                          nd->swap_hostnam,
1661                                          nd->swap_fh, &nd->swap_fhsize,
1662                                          &nd->swap_args, td);
1663                         if (error != 0)
1664                                 panic("nfs_boot: mountd swap, error=%d",
1665                                       error);
1666
1667                         error = md_lookup_swap(&nd->swap_saddr,
1668                                                gctx->lookup_path,
1669                                                nd->swap_fh, &nd->swap_fhsize,
1670                                                &nd->swap_args, td);
1671                         if (error != 0)
1672                                 panic("nfs_boot: lookup swap, error=%d",
1673                                       error);
1674                 }
1675                 nfs_diskless_valid = 3;
1676         }
1677
1678         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1679         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1680         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1681         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1682                 ifctx->myaddr.sin_addr.s_addr |
1683                 ~ ifctx->netmask.sin_addr.s_addr;
1684         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1685
1686 out:
1687         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1688                 nctx = ifctx->next;
1689                 kfree(ifctx, M_TEMP);
1690         }
1691         kfree(gctx, M_TEMP);
1692 }
1693