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         ifnet_lock();
 397         TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
 398                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
 399                         struct ifaddr *ifa = ifac->ifa;
 400
 401                         if (ifa->ifa_addr->sa_family == AF_INET)
 402                                 bootpboot_p_if(ifp, ifa);
 403                 }
 404         }
 405         ifnet_unlock();
 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         char hexstr[64];
 590
 591         /*
 592          * Create socket and set its recieve timeout.
 593          */
 594         error = socreate(AF_INET, &so, SOCK_DGRAM, 0, td);
 595         if (error != 0)
 596                 goto out;
 597
 598         tv.tv_sec = 1;
 599         tv.tv_usec = 0;
 600         bzero(&sopt, sizeof(sopt));
 601         sopt.sopt_level = SOL_SOCKET;
 602         sopt.sopt_name = SO_RCVTIMEO;
 603         sopt.sopt_val = &tv;
 604         sopt.sopt_valsize = sizeof tv;
 605
 606         error = sosetopt(so, &sopt);
 607         if (error != 0)
 608                 goto out;
 609
 610         /*
 611          * Enable broadcast.
 612          */
 613         on = 1;
 614         sopt.sopt_name = SO_BROADCAST;
 615         sopt.sopt_val = &on;
 616         sopt.sopt_valsize = sizeof on;
 617
 618         error = sosetopt(so, &sopt);
 619         if (error != 0)
 620                 goto out;
 621
 622         /*
 623          * Disable routing.
 624          */
 625
 626         on = 1;
 627         sopt.sopt_name = SO_DONTROUTE;
 628         sopt.sopt_val = &on;
 629         sopt.sopt_valsize = sizeof on;
 630
 631         error = sosetopt(so, &sopt);
 632         if (error != 0)
 633                 goto out;
 634
 635         /*
 636          * Bind the local endpoint to a bootp client port.
 637          */
 638         sin = &dst;
 639         clear_sinaddr(sin);
 640         sin->sin_port = htons(IPPORT_BOOTPC);
 641         error = sobind(so, (struct sockaddr *)sin, td);
 642         if (error != 0) {
 643                 kprintf("bind failed\n");
 644                 goto out;
 645         }
 646
 647         /*
 648          * Setup socket address for the server.
 649          */
 650         sin = &dst;
 651         clear_sinaddr(sin);
 652         sin->sin_addr.s_addr = INADDR_BROADCAST;
 653         sin->sin_port = htons(IPPORT_BOOTPS);
 654
 655         /*
 656          * Send it, repeatedly, until a reply is received,
 657          * but delay each re-send by an increasing amount.
 658          * If the delay hits the maximum, start complaining.
 659          */
 660         timo = 0;
 661         rtimo = 0;
 662         for (;;) {
 663
 664                 outstanding = 0;
 665                 gotrootpath = 0;
 666
 667                 for (ifctx = gctx->interfaces;
 668                      ifctx != NULL;
 669                      ifctx = ifctx->next) {
 670                         if (bootpc_ifctx_isresolved(ifctx) != 0 &&
 671                             bootpc_tag(&gctx->tmptag, &ifctx->reply,
 672                                        ifctx->replylen,
 673                                        TAG_ROOT) != NULL)
 674                                 gotrootpath = 1;
 675                 }
 676
 677                 for (ifctx = gctx->interfaces;
 678                      ifctx != NULL;
 679                      ifctx = ifctx->next) {
 680                         ifctx->outstanding = 0;
 681                         if (bootpc_ifctx_isresolved(ifctx)  != 0 &&
 682                             gotrootpath != 0) {
 683                                 continue;
 684                         }
 685                         if (bootpc_ifctx_isfailed(ifctx) != 0)
 686                                 continue;
 687
 688                         outstanding++;
 689                         ifctx->outstanding = 1;
 690
 691                         /* Proceed to next step in DHCP negotiation */
 692                         if ((ifctx->state == IF_DHCP_OFFERED &&
 693                              ifctx->dhcpquerytype != DHCP_REQUEST) ||
 694                             (ifctx->state == IF_DHCP_UNRESOLVED &&
 695                              ifctx->dhcpquerytype != DHCP_DISCOVER) ||
 696                             (ifctx->state == IF_BOOTP_UNRESOLVED &&
 697                              ifctx->dhcpquerytype != DHCP_NOMSG)) {
 698                                 ifctx->sentmsg = 0;
 699                                 bootpc_compose_query(ifctx, gctx, td);
 700                         }
 701
 702                         /* Send BOOTP request (or re-send). */
 703
 704                         if (ifctx->sentmsg == 0) {
 705                                 switch(ifctx->dhcpquerytype) {
 706                                 case DHCP_DISCOVER:
 707                                         s = "DHCP Discover";
 708                                         break;
 709                                 case DHCP_REQUEST:
 710                                         s = "DHCP Request";
 711                                         break;
 712                                 case DHCP_NOMSG:
 713                                 default:
 714                                         s = "BOOTP Query";
 715                                         break;
 716                                 }
 717                                 hexncpy((u_char *)LLADDR(ifctx->sdl),
 718                                     ifctx->sdl->sdl_alen, hexstr,
 719                                     HEX_NCPYLEN(ifctx->sdl->sdl_alen), ":");
 720                                 kprintf("Sending %s packet from "
 721                                        "interface %s (%s)\n",
 722                                        s, ifctx->ireq.ifr_name,
 723                                        hexstr);
 724                                 ifctx->sentmsg = 1;
 725                         }
 726
 727                         aio.iov_base = (caddr_t) &ifctx->call;
 728                         aio.iov_len = sizeof(ifctx->call);
 729
 730                         auio.uio_iov = &aio;
 731                         auio.uio_iovcnt = 1;
 732                         auio.uio_segflg = UIO_SYSSPACE;
 733                         auio.uio_rw = UIO_WRITE;
 734                         auio.uio_offset = 0;
 735                         auio.uio_resid = sizeof(ifctx->call);
 736                         auio.uio_td = td;
 737
 738                         /* Set netmask to 0.0.0.0 */
 739
 740                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 741                         clear_sinaddr(sin);
 742                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 743                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
 744                         if (error != 0)
 745                                 panic("bootpc_call:"
 746                                       "set if netmask, error=%d",
 747                                       error);
 748
 749                         error = sosend(so, (struct sockaddr *) &dst,
 750                                        &auio, NULL, NULL, 0, td);
 751                         if (error != 0) {
 752                                 kprintf("bootpc_call: sosend: %d state %08x\n",
 753                                        error, (int) so->so_state);
 754                         }
 755
 756                         /* XXX: Is this needed ? */
 757                         tsleep(&error, 0, "bootpw", 10);
 758
 759                         /* Set netmask to 255.0.0.0 */
 760
 761                         sin = (struct sockaddr_in *) &ifctx->ireq.ifr_addr;
 762                         clear_sinaddr(sin);
 763                         sin->sin_addr.s_addr = htonl(0xff000000u);
 764                         error = ifioctl(ifctx->so, SIOCSIFNETMASK,
 765                                         (caddr_t) &ifctx->ireq, proc0.p_ucred);
 766                         if (error != 0)
 767                                 panic("bootpc_call:"
 768                                       "set if netmask, error=%d",
 769                                       error);
 770
 771                 }
 772
 773                 if (outstanding == 0 &&
 774                     (rtimo == 0 || time_uptime >= rtimo)) {
 775                         error = 0;
 776                         goto gotreply;
 777                 }
 778
 779                 /* Determine new timeout. */
 780                 if (timo < MAX_RESEND_DELAY)
 781                         timo++;
 782                 else {
 783                         kprintf("DHCP/BOOTP timeout for server ");
 784                         print_sin_addr(&dst);
 785                         kprintf("\n");
 786                 }
 787
 788                 /*
 789                  * Wait for up to timo seconds for a reply.
 790                  * The socket receive timeout was set to 1 second.
 791                  */
 792                 atimo = timo + time_uptime;
 793                 while (time_uptime < atimo) {
 794                         aio.iov_base = (caddr_t) &gctx->reply;
 795                         aio.iov_len = sizeof(gctx->reply);
 796
 797                         auio.uio_iov = &aio;
 798                         auio.uio_iovcnt = 1;
 799                         auio.uio_segflg = UIO_SYSSPACE;
 800                         auio.uio_rw = UIO_READ;
 801                         auio.uio_offset = 0;
 802                         auio.uio_resid = sizeof(gctx->reply);
 803                         auio.uio_td = td;
 804
 805                         rcvflg = 0;
 806                         error = soreceive(so, NULL, &auio,
 807                                           NULL, NULL, &rcvflg);
 808                         gctx->secs = time_uptime - gctx->starttime;
 809                         for (ifctx = gctx->interfaces;
 810                              ifctx != NULL;
 811                              ifctx = ifctx->next) {
 812                                 if (bootpc_ifctx_isresolved(ifctx) != 0 ||
 813                                     bootpc_ifctx_isfailed(ifctx) != 0)
 814                                         continue;
 815
 816                                 ifctx->call.secs = htons(gctx->secs);
 817                         }
 818                         if (error == EWOULDBLOCK)
 819                                 continue;
 820                         if (error != 0)
 821                                 goto out;
 822                         len = sizeof(gctx->reply) - auio.uio_resid;
 823
 824                         /* Do we have the required number of bytes ? */
 825                         if (len < BOOTP_MIN_LEN)
 826                                 continue;
 827                         gctx->replylen = len;
 828
 829                         /* Is it a reply? */
 830                         if (gctx->reply.op != BOOTP_REPLY)
 831                                 continue;
 832
 833                         /* Is this an answer to our query */
 834                         for (ifctx = gctx->interfaces;
 835                              ifctx != NULL;
 836                              ifctx = ifctx->next) {
 837                                 if (gctx->reply.xid != ifctx->call.xid)
 838                                         continue;
 839
 840                                 /* Same HW address size ? */
 841                                 if (gctx->reply.hlen != ifctx->call.hlen)
 842                                         continue;
 843
 844                                 /* Correct HW address ? */
 845                                 if (bcmp(gctx->reply.chaddr,
 846                                          ifctx->call.chaddr,
 847                                          ifctx->call.hlen) != 0)
 848                                         continue;
 849
 850                                 break;
 851                         }
 852
 853                         if (ifctx != NULL) {
 854                                 s =  bootpc_tag(&gctx->tmptag,
 855                                                 &gctx->reply,
 856                                                 gctx->replylen,
 857                                                 TAG_DHCP_MSGTYPE);
 858                                 if (s != NULL) {
 859                                         switch (*s) {
 860                                         case DHCP_OFFER:
 861                                                 s = "DHCP Offer";
 862                                                 break;
 863                                         case DHCP_ACK:
 864                                                 s = "DHCP Ack";
 865                                                 break;
 866                                         default:
 867                                                 s = "DHCP (unexpected)";
 868                                                 break;
 869                                         }
 870                                 } else
 871                                         s = "BOOTP Reply";
 872
 873                                 kprintf("Received %s packet"
 874                                        " on %s from ",
 875                                        s,
 876                                        ifctx->ireq.ifr_name);
 877                                 print_in_addr(gctx->reply.siaddr);
 878                                 if (gctx->reply.giaddr.s_addr !=
 879                                     htonl(INADDR_ANY)) {
 880                                         kprintf(" via ");
 881                                         print_in_addr(gctx->reply.giaddr);
 882                                 }
 883                                 if (bootpc_received(gctx, ifctx) != 0) {
 884                                         kprintf(" (accepted)");
 885                                         if (ifctx->outstanding) {
 886                                                 ifctx->outstanding = 0;
 887                                                 outstanding--;
 888                                         }
 889                                         /* Network settle delay */
 890                                         if (outstanding == 0)
 891                                                 atimo = time_uptime +
 892                                                         BOOTP_SETTLE_DELAY;
 893                                 } else
 894                                         kprintf(" (ignored)");
 895                                 if (ifctx->gotrootpath) {
 896                                         gotrootpath = 1;
 897                                         rtimo = time_uptime +
 898                                                 BOOTP_SETTLE_DELAY;
 899                                         kprintf(" (got root path)");
 900                                 } else
 901                                         kprintf(" (no root path)");
 902                                 kprintf("\n");
 903                         }
 904                 } /* while secs */
 905 #ifdef BOOTP_TIMEOUT
 906                 if (gctx->secs > BOOTP_TIMEOUT && BOOTP_TIMEOUT > 0)
 907                         break;
 908 #endif
 909                 /* Force a retry if halfway in DHCP negotiation */
 910                 retry = 0;
 911                 for (ifctx = gctx->interfaces; ifctx != NULL;
 912                      ifctx = ifctx->next) {
 913                         if (ifctx->state == IF_DHCP_OFFERED) {
 914                                 if (ifctx->dhcpquerytype == DHCP_DISCOVER)
 915                                         retry = 1;
 916                                 else
 917                                         ifctx->state = IF_DHCP_UNRESOLVED;
 918                         }
 919                 }
 920
 921                 if (retry != 0)
 922                         continue;
 923
 924                 if (gotrootpath != 0) {
 925                         gctx->gotrootpath = gotrootpath;
 926                         if (rtimo != 0 && time_uptime >= rtimo)
 927                                 break;
 928                 }
 929         } /* forever send/receive */
 930
 931         /*
 932          * XXX: These are errors of varying seriousness being silently
 933          * ignored
 934          */
 935
 936         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 937                 if (bootpc_ifctx_isresolved(ifctx) == 0) {
 938                         kprintf("%s timeout for interface %s\n",
 939                                ifctx->dhcpquerytype != DHCP_NOMSG ?
 940                                "DHCP" : "BOOTP",
 941                                ifctx->ireq.ifr_name);
 942                 }
 943         }
 944         if (gctx->gotrootpath != 0) {
 945 #if 0
 946                 kprintf("Got a root path, ignoring remaining timeout\n");
 947 #endif
 948                 error = 0;
 949                 goto out;
 950         }
 951 #ifndef BOOTP_NFSROOT
 952         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
 953                 if (bootpc_ifctx_isresolved(ifctx) != 0) {
 954                         error = 0;
 955                         goto out;
 956                 }
 957         }
 958 #endif
 959         error = ETIMEDOUT;
 960         goto out;
 961
 962 gotreply:
 963 out:
 964         soclose(so, FNONBLOCK);
 965         return error;
 966 }
 967
 968
 969 static int
 970 bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 971                         struct bootpc_globalcontext *gctx,
 972                         struct thread *td)
 973 {
 974         struct ifaddr_container *ifac;
 975         struct sockaddr_in *sin;
 976         int error;
 977
 978         struct ifreq *ireq;
 979         struct socket *so;
 980         struct sockaddr_dl *sdl;
 981
 982         error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td);
 983         if (error != 0)
 984                 panic("nfs_boot: socreate, error=%d", error);
 985
 986         ireq = &ifctx->ireq;
 987         so = ifctx->so;
 988
 989         /*
 990          * Bring up the interface.
 991          *
 992          * Get the old interface flags and or IFF_UP into them; if
 993          * IFF_UP set blindly, interface selection can be clobbered.
 994          */
 995         error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
 996         if (error != 0)
 997                 panic("bootpc_fakeup_interface: GIFFLAGS, error=%d", error);
 998         ireq->ifr_flags |= IFF_UP;
 999         error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1000         if (error != 0)
1001                 panic("bootpc_fakeup_interface: SIFFLAGS, error=%d", error);
1002
1003         /*
1004          * Do enough of ifconfig(8) so that the chosen interface
1005          * can talk to the servers.  (just set the address)
1006          */
1007
1008         /* addr is 0.0.0.0 */
1009
1010         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1011         clear_sinaddr(sin);
1012         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1013         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1014                 panic("bootpc_fakeup_interface: "
1015                       "set if addr, error=%d", error);
1016
1017         /* netmask is 255.0.0.0 */
1018
1019         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1020         clear_sinaddr(sin);
1021         sin->sin_addr.s_addr = htonl(0xff000000u);
1022         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t)ireq, proc0.p_ucred);
1023         if (error != 0)
1024                 panic("bootpc_fakeup_interface: set if netmask, error=%d",
1025                       error);
1026
1027         /* Broadcast is 255.255.255.255 */
1028
1029         sin = (struct sockaddr_in *)&ireq->ifr_addr;
1030         clear_sinaddr(sin);
1031         clear_sinaddr(&ifctx->broadcast);
1032         sin->sin_addr.s_addr = htonl(INADDR_BROADCAST);
1033         ifctx->broadcast.sin_addr.s_addr = sin->sin_addr.s_addr;
1034
1035         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t)ireq, proc0.p_ucred);
1036         if (error != 0 && error != EADDRNOTAVAIL)
1037                 panic("bootpc_fakeup_interface: "
1038                       "set if broadcast addr, error=%d",
1039                       error);
1040         error = 0;
1041
1042         /* Get HW address */
1043
1044         sdl = NULL;
1045         TAILQ_FOREACH(ifac, &ifctx->ifp->if_addrheads[mycpuid], ifa_link) {
1046                 struct ifaddr *ifa = ifac->ifa;
1047
1048                 if (ifa->ifa_addr->sa_family == AF_LINK &&
1049                     (sdl = ((struct sockaddr_dl *) ifa->ifa_addr)) != NULL &&
1050                     sdl->sdl_type == IFT_ETHER)
1051                         break;
1052         }
1053
1054         if (sdl == NULL)
1055                 panic("bootpc: Unable to find HW address for %s",
1056                       ifctx->ireq.ifr_name);
1057         ifctx->sdl = sdl;
1058
1059         return error;
1060 }
1061
1062
1063 static int
1064 bootpc_adjust_interface(struct bootpc_ifcontext *ifctx,
1065                         struct bootpc_globalcontext *gctx,
1066                         struct thread *td)
1067 {
1068         int error;
1069         struct sockaddr_in defdst;
1070         struct sockaddr_in defmask;
1071         struct sockaddr_in *sin;
1072
1073         struct ifreq *ireq;
1074         struct socket *so;
1075         struct sockaddr_in *myaddr;
1076         struct sockaddr_in *netmask;
1077         struct sockaddr_in *gw;
1078
1079         ireq = &ifctx->ireq;
1080         so = ifctx->so;
1081         myaddr = &ifctx->myaddr;
1082         netmask = &ifctx->netmask;
1083         gw = &ifctx->gw;
1084
1085         if (bootpc_ifctx_isresolved(ifctx) == 0) {
1086
1087                 /* Shutdown interfaces where BOOTP failed */
1088
1089                 kprintf("Shutdown interface %s\n", ifctx->ireq.ifr_name);
1090                 error = ifioctl(so, SIOCGIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1091                 if (error != 0)
1092                         panic("bootpc_adjust_interface: "
1093                               "SIOCGIFFLAGS, error=%d", error);
1094                 ireq->ifr_flags &= ~IFF_UP;
1095                 error = ifioctl(so, SIOCSIFFLAGS, (caddr_t)ireq, proc0.p_ucred);
1096                 if (error != 0)
1097                         panic("bootpc_adjust_interface: "
1098                               "SIOCSIFFLAGS, error=%d", error);
1099
1100                 sin = (struct sockaddr_in *) &ireq->ifr_addr;
1101                 clear_sinaddr(sin);
1102                 error = ifioctl(so, SIOCDIFADDR, (caddr_t) ireq, proc0.p_ucred);
1103                 if (error != 0 && (error != EADDRNOTAVAIL ||
1104                                    ifctx == gctx->interfaces))
1105                         panic("bootpc_adjust_interface: "
1106                               "SIOCDIFADDR, error=%d", error);
1107
1108                 return 0;
1109         }
1110
1111         kprintf("Adjusted interface %s\n", ifctx->ireq.ifr_name);
1112         /*
1113          * Do enough of ifconfig(8) so that the chosen interface
1114          * can talk to the servers.  (just set the address)
1115          */
1116         bcopy(netmask, &ireq->ifr_addr, sizeof(*netmask));
1117         error = ifioctl(so, SIOCSIFNETMASK, (caddr_t) ireq, proc0.p_ucred);
1118         if (error != 0)
1119                 panic("bootpc_adjust_interface: "
1120                       "set if netmask, error=%d", error);
1121
1122         /* Broadcast is with host part of IP address all 1's */
1123
1124         sin = (struct sockaddr_in *) &ireq->ifr_addr;
1125         clear_sinaddr(sin);
1126         sin->sin_addr.s_addr = myaddr->sin_addr.s_addr |
1127                 ~ netmask->sin_addr.s_addr;
1128         error = ifioctl(so, SIOCSIFBRDADDR, (caddr_t) ireq, proc0.p_ucred);
1129         if (error != 0)
1130                 panic("bootpc_adjust_interface: "
1131                       "set if broadcast addr, error=%d", error);
1132
1133         bcopy(myaddr, &ireq->ifr_addr, sizeof(*myaddr));
1134         error = ifioctl(so, SIOCSIFADDR, (caddr_t) ireq, proc0.p_ucred);
1135         if (error != 0 && (error != EEXIST || ifctx == gctx->interfaces))
1136                 panic("bootpc_adjust_interface: "
1137                       "set if addr, error=%d", error);
1138
1139         /* Add new default route */
1140
1141         if (ifctx->gotgw != 0 || gctx->gotgw == 0) {
1142                 clear_sinaddr(&defdst);
1143                 clear_sinaddr(&defmask);
1144                 error = rtrequest_global(RTM_ADD, (struct sockaddr *) &defdst,
1145                                          (struct sockaddr *) gw,
1146                                          (struct sockaddr *) &defmask,
1147                                          (RTF_UP | RTF_GATEWAY | RTF_STATIC));
1148                 if (error != 0) {
1149                         kprintf("bootpc_adjust_interface: "
1150                                "add net route, error=%d\n", error);
1151                         return error;
1152                 }
1153         }
1154
1155         return 0;
1156 }
1157
1158 static void
1159 print_sin_addr(struct sockaddr_in *sin)
1160 {
1161         print_in_addr(sin->sin_addr);
1162 }
1163
1164
1165 static void
1166 print_in_addr(struct in_addr addr)
1167 {
1168         unsigned int ip;
1169
1170         ip = ntohl(addr.s_addr);
1171         kprintf("%d.%d.%d.%d",
1172                ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1173 }
1174
1175 static void
1176 bootpc_compose_query(struct bootpc_ifcontext *ifctx,
1177                      struct bootpc_globalcontext *gctx, struct thread *td)
1178 {
1179         unsigned char *vendp;
1180         unsigned char vendor_client[64];
1181         uint32_t leasetime;
1182         uint8_t vendor_client_len;
1183
1184         ifctx->gotrootpath = 0;
1185
1186         bzero((caddr_t) &ifctx->call, sizeof(ifctx->call));
1187
1188         /* bootpc part */
1189         ifctx->call.op = BOOTP_REQUEST;         /* BOOTREQUEST */
1190         ifctx->call.htype = 1;                  /* 10mb ethernet */
1191         ifctx->call.hlen = ifctx->sdl->sdl_alen;/* Hardware address length */
1192         ifctx->call.hops = 0;
1193         if (bootpc_ifctx_isunresolved(ifctx) != 0)
1194                 ifctx->xid++;
1195         ifctx->call.xid = txdr_unsigned(ifctx->xid);
1196         bcopy(LLADDR(ifctx->sdl), &ifctx->call.chaddr, ifctx->sdl->sdl_alen);
1197
1198         vendp = ifctx->call.vend;
1199         *vendp++ = 99;          /* RFC1048 cookie */
1200         *vendp++ = 130;
1201         *vendp++ = 83;
1202         *vendp++ = 99;
1203         *vendp++ = TAG_MAXMSGSIZE;
1204         *vendp++ = 2;
1205         *vendp++ = (sizeof(struct bootp_packet) >> 8) & 255;
1206         *vendp++ = sizeof(struct bootp_packet) & 255;
1207
1208         ksnprintf(vendor_client, sizeof(vendor_client), "%s:%s:%s",
1209                 ostype, MACHINE, osrelease);
1210         vendor_client_len = strlen(vendor_client);
1211         *vendp++ = TAG_VENDOR_INDENTIFIER;
1212         *vendp++ = vendor_client_len;
1213         memcpy(vendp, vendor_client, vendor_client_len);
1214         vendp += vendor_client_len;
1215         ifctx->dhcpquerytype = DHCP_NOMSG;
1216         switch (ifctx->state) {
1217         case IF_DHCP_UNRESOLVED:
1218                 *vendp++ = TAG_DHCP_MSGTYPE;
1219                 *vendp++ = 1;
1220                 *vendp++ = DHCP_DISCOVER;
1221                 ifctx->dhcpquerytype = DHCP_DISCOVER;
1222                 ifctx->gotdhcpserver = 0;
1223                 break;
1224         case IF_DHCP_OFFERED:
1225                 *vendp++ = TAG_DHCP_MSGTYPE;
1226                 *vendp++ = 1;
1227                 *vendp++ = DHCP_REQUEST;
1228                 ifctx->dhcpquerytype = DHCP_REQUEST;
1229                 *vendp++ = TAG_DHCP_REQ_ADDR;
1230                 *vendp++ = 4;
1231                 memcpy(vendp, &ifctx->reply.yiaddr, 4);
1232                 vendp += 4;
1233                 if (ifctx->gotdhcpserver != 0) {
1234                         *vendp++ = TAG_DHCP_SERVERID;
1235                         *vendp++ = 4;
1236                         memcpy(vendp, &ifctx->dhcpserver, 4);
1237                         vendp += 4;
1238                 }
1239                 *vendp++ = TAG_DHCP_LEASETIME;
1240                 *vendp++ = 4;
1241                 leasetime = htonl(300);
1242                 memcpy(vendp, &leasetime, 4);
1243                 vendp += 4;
1244         default:
1245                 ;
1246         }
1247         *vendp = TAG_END;
1248
1249         ifctx->call.secs = 0;
1250         ifctx->call.flags = htons(0x8000); /* We need an broadcast answer */
1251 }
1252
1253
1254 static int
1255 bootpc_hascookie(struct bootp_packet *bp)
1256 {
1257         return (bp->vend[0] == 99 && bp->vend[1] == 130 &&
1258                 bp->vend[2] == 83 && bp->vend[3] == 99);
1259 }
1260
1261
1262 static void
1263 bootpc_tag_helper(struct bootpc_tagcontext *tctx,
1264                   unsigned char *start, int len, int tag)
1265 {
1266         unsigned char *j;
1267         unsigned char *ej;
1268         unsigned char code;
1269
1270         if (tctx->badtag != 0 || tctx->badopt != 0)
1271                 return;
1272
1273         j = start;
1274         ej = j + len;
1275
1276         while (j < ej) {
1277                 code = *j++;
1278                 if (code == TAG_PAD)
1279                         continue;
1280                 if (code == TAG_END)
1281                         return;
1282                 if (j >= ej || j + *j + 1 > ej) {
1283                         tctx->badopt = 1;
1284                         return;
1285                 }
1286                 len = *j++;
1287                 if (code == tag) {
1288                         if (tctx->taglen + len > TAG_MAXLEN) {
1289                                 tctx->badtag = 1;
1290                                 return;
1291                         }
1292                         tctx->foundopt = 1;
1293                         if (len > 0)
1294                                 memcpy(tctx->buf + tctx->taglen,
1295                                        j, len);
1296                         tctx->taglen += len;
1297                 }
1298                 if (code == TAG_OVERLOAD)
1299                         tctx->overload = *j;
1300
1301                 j += len;
1302         }
1303 }
1304
1305
1306 static unsigned char *
1307 bootpc_tag(struct bootpc_tagcontext *tctx, struct bootp_packet *bp,
1308            int len, int tag)
1309 {
1310         tctx->overload = 0;
1311         tctx->badopt = 0;
1312         tctx->badtag = 0;
1313         tctx->foundopt = 0;
1314         tctx->taglen = 0;
1315
1316         if (bootpc_hascookie(bp) == 0)
1317                 return NULL;
1318
1319         bootpc_tag_helper(tctx, &bp->vend[4],
1320                           (unsigned char *) bp + len - &bp->vend[4], tag);
1321
1322         if ((tctx->overload & OVERLOAD_FILE) != 0)
1323                 bootpc_tag_helper(tctx,
1324                                   (unsigned char *) bp->file,
1325                                   sizeof(bp->file),
1326                                   tag);
1327         if ((tctx->overload & OVERLOAD_SNAME) != 0)
1328                 bootpc_tag_helper(tctx,
1329                                   (unsigned char *) bp->sname,
1330                                   sizeof(bp->sname),
1331                                   tag);
1332
1333         if (tctx->badopt != 0 || tctx->badtag != 0 || tctx->foundopt == 0)
1334                 return NULL;
1335         tctx->buf[tctx->taglen] = '\0';
1336         return tctx->buf;
1337 }
1338
1339
1340 static void
1341 bootpc_decode_reply(struct nfsv3_diskless *nd, struct bootpc_ifcontext *ifctx,
1342                     struct bootpc_globalcontext *gctx)
1343 {
1344         char *p;
1345         unsigned int ip;
1346
1347         ifctx->gotgw = 0;
1348         ifctx->gotnetmask = 0;
1349
1350         clear_sinaddr(&ifctx->myaddr);
1351         clear_sinaddr(&ifctx->netmask);
1352         clear_sinaddr(&ifctx->gw);
1353
1354         ifctx->myaddr.sin_addr = ifctx->reply.yiaddr;
1355
1356         ip = ntohl(ifctx->myaddr.sin_addr.s_addr);
1357         ksnprintf(gctx->lookup_path, sizeof(gctx->lookup_path),
1358                  "swap.%d.%d.%d.%d",
1359                  ip >> 24, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255);
1360
1361         kprintf("%s at ", ifctx->ireq.ifr_name);
1362         print_sin_addr(&ifctx->myaddr);
1363         kprintf(" server ");
1364         print_in_addr(ifctx->reply.siaddr);
1365
1366         ifctx->gw.sin_addr = ifctx->reply.giaddr;
1367         if (ifctx->reply.giaddr.s_addr != htonl(INADDR_ANY)) {
1368                 kprintf(" via gateway ");
1369                 print_in_addr(ifctx->reply.giaddr);
1370         }
1371
1372         /* This call used for the side effect (overload flag) */
1373         (void) bootpc_tag(&gctx->tmptag,
1374                           &ifctx->reply, ifctx->replylen, TAG_END);
1375
1376         if ((gctx->tmptag.overload & OVERLOAD_SNAME) == 0)
1377                 if (ifctx->reply.sname[0] != '\0')
1378                         kprintf(" server name %s", ifctx->reply.sname);
1379         if ((gctx->tmptag.overload & OVERLOAD_FILE) == 0)
1380                 if (ifctx->reply.file[0] != '\0')
1381                         kprintf(" boot file %s", ifctx->reply.file);
1382
1383         kprintf("\n");
1384
1385         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1386                        TAG_SUBNETMASK);
1387         if (p != NULL) {
1388                 if (gctx->tag.taglen != 4)
1389                         panic("bootpc: subnet mask len is %d",
1390                               gctx->tag.taglen);
1391                 bcopy(p, &ifctx->netmask.sin_addr, 4);
1392                 ifctx->gotnetmask = 1;
1393                 kprintf("subnet mask ");
1394                 print_sin_addr(&ifctx->netmask);
1395                 kprintf(" ");
1396         }
1397
1398         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1399                        TAG_ROUTERS);
1400         if (p != NULL) {
1401                 /* Routers */
1402                 if (gctx->tag.taglen % 4)
1403                         panic("bootpc: Router Len is %d", gctx->tag.taglen);
1404                 if (gctx->tag.taglen > 0) {
1405                         bcopy(p, &ifctx->gw.sin_addr, 4);
1406                         kprintf("router ");
1407                         print_sin_addr(&ifctx->gw);
1408                         kprintf(" ");
1409                         ifctx->gotgw = 1;
1410                         gctx->gotgw = 1;
1411                 }
1412         }
1413
1414         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1415                        TAG_ROOT);
1416         if (p != NULL) {
1417                 if (gctx->setrootfs != NULL) {
1418                         kprintf("rootfs %s (ignored) ", p);
1419                 } else  if (setfs(&nd->root_saddr,
1420                                   nd->root_hostnam, p)) {
1421                         kprintf("rootfs %s ",p);
1422                         gctx->gotrootpath = 1;
1423                         ifctx->gotrootpath = 1;
1424                         gctx->setrootfs = ifctx;
1425
1426                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1427                                        ifctx->replylen,
1428                                        TAG_ROOTOPTS);
1429                         if (p != NULL) {
1430                                 nfs_mountopts(&nd->root_args, p);
1431                                 kprintf("rootopts %s ", p);
1432                         }
1433                 } else
1434                         panic("Failed to set rootfs to %s",p);
1435         }
1436
1437         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1438                        TAG_SWAP);
1439         if (p != NULL) {
1440                 if (gctx->setswapfs != NULL) {
1441                         kprintf("swapfs %s (ignored) ", p);
1442                 } else  if (setfs(&nd->swap_saddr,
1443                                   nd->swap_hostnam, p)) {
1444                         gctx->gotswappath = 1;
1445                         gctx->setswapfs = ifctx;
1446                         kprintf("swapfs %s ", p);
1447
1448                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1449                                        ifctx->replylen,
1450                                        TAG_SWAPOPTS);
1451                         if (p != NULL) {
1452                                 /* swap mount options */
1453                                 nfs_mountopts(&nd->swap_args, p);
1454                                 kprintf("swapopts %s ", p);
1455                         }
1456
1457                         p = bootpc_tag(&gctx->tag, &ifctx->reply,
1458                                        ifctx->replylen,
1459                                        TAG_SWAPSIZE);
1460                         if (p != NULL) {
1461                                 int swaplen;
1462                                 if (gctx->tag.taglen != 4)
1463                                         panic("bootpc: "
1464                                               "Expected 4 bytes for swaplen, "
1465                                               "not %d bytes",
1466                                               gctx->tag.taglen);
1467                                 bcopy(p, &swaplen, 4);
1468                                 nd->swap_nblks = ntohl(swaplen);
1469                                 kprintf("swapsize %d KB ",
1470                                        nd->swap_nblks);
1471                         }
1472                 } else
1473                         panic("Failed to set swapfs to %s", p);
1474         }
1475
1476         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1477                        TAG_HOSTNAME);
1478         if (p != NULL) {
1479                 if (gctx->tag.taglen >= MAXHOSTNAMELEN)
1480                         panic("bootpc: hostname >= %d bytes",
1481                               MAXHOSTNAMELEN);
1482                 if (gctx->sethostname != NULL) {
1483                         kprintf("hostname %s (ignored) ", p);
1484                 } else {
1485                         strcpy(nd->my_hostnam, p);
1486                         strcpy(hostname, p);
1487                         kprintf("hostname %s ",hostname);
1488                         gctx->sethostname = ifctx;
1489                 }
1490         }
1491         p = bootpc_tag(&gctx->tag, &ifctx->reply, ifctx->replylen,
1492                        TAG_COOKIE);
1493         if (p != NULL) {        /* store in a sysctl variable */
1494                 int i, l = sizeof(bootp_cookie) - 1;
1495                 for (i = 0; i < l && p[i] != '\0'; i++)
1496                         bootp_cookie[i] = p[i];
1497                 p[i] = '\0';
1498         }
1499
1500         kprintf("\n");
1501
1502         if (ifctx->gotnetmask == 0) {
1503                 if (IN_CLASSA(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1504                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSA_NET);
1505                 else if (IN_CLASSB(ntohl(ifctx->myaddr.sin_addr.s_addr)))
1506                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSB_NET);
1507                 else
1508                         ifctx->netmask.sin_addr.s_addr = htonl(IN_CLASSC_NET);
1509         }
1510         if (ifctx->gotgw == 0) {
1511                 /* Use proxyarp */
1512                 ifctx->gw.sin_addr.s_addr = ifctx->myaddr.sin_addr.s_addr;
1513         }
1514 }
1515
1516 void
1517 bootpc_init(void)
1518 {
1519         struct bootpc_ifcontext *ifctx, *nctx;  /* Interface BOOTP contexts */
1520         struct bootpc_globalcontext *gctx;      /* Global BOOTP context */
1521         struct ifnet *ifp;
1522         int error;
1523         struct nfsv3_diskless *nd;
1524         struct thread *td;
1525
1526         nd = &nfsv3_diskless;
1527         td = curthread;
1528
1529         /*
1530          * If already filled in, don't touch it here
1531          */
1532         if (nfs_diskless_valid != 0)
1533                 return;
1534
1535         gctx = kmalloc(sizeof(*gctx), M_TEMP, M_WAITOK | M_ZERO);
1536
1537         gctx->xid = ~0xFFFF;
1538         gctx->starttime = time_uptime;
1539
1540         ifctx = allocifctx(gctx);
1541
1542         /*
1543          * Find a network interface.
1544          */
1545 #ifdef BOOTP_WIRED_TO
1546         kprintf("bootpc_init: wired to interface '%s'\n",
1547                __XSTRING(BOOTP_WIRED_TO));
1548 #endif
1549         bzero(&ifctx->ireq, sizeof(ifctx->ireq));
1550         /* XXX ALMOST MPSAFE */
1551         ifnet_lock();
1552         TAILQ_FOREACH(ifp, &ifnetlist, if_link) {
1553                 strlcpy(ifctx->ireq.ifr_name, ifp->if_xname,
1554                          sizeof(ifctx->ireq.ifr_name));
1555 #ifdef BOOTP_WIRED_TO
1556                 if (strcmp(ifctx->ireq.ifr_name,
1557                            __XSTRING(BOOTP_WIRED_TO)) != 0)
1558                         continue;
1559 #else
1560                 if ((ifp->if_flags &
1561                      (IFF_LOOPBACK | IFF_POINTOPOINT | IFF_BROADCAST)) !=
1562                     IFF_BROADCAST)
1563                         continue;
1564 #endif
1565                 if (gctx->interfaces != NULL)
1566                         gctx->lastinterface->next = ifctx;
1567                 else
1568                         gctx->interfaces = ifctx;
1569                 ifctx->ifp = ifp;
1570                 gctx->lastinterface = ifctx;
1571                 ifctx = allocifctx(gctx);
1572         }
1573         ifnet_unlock();
1574         kfree(ifctx, M_TEMP);
1575
1576         if (gctx->interfaces == NULL) {
1577 #ifdef BOOTP_WIRED_TO
1578                 panic("bootpc_init: Could not find interface specified "
1579                       "by BOOTP_WIRED_TO: "
1580                       __XSTRING(BOOTP_WIRED_TO));
1581 #else
1582                 panic("bootpc_init: no suitable interface");
1583 #endif
1584         }
1585
1586         gctx->gotrootpath = 0;
1587         gctx->gotswappath = 0;
1588         gctx->gotgw = 0;
1589
1590         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1591                 bootpc_fakeup_interface(ifctx, gctx, td);
1592
1593         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1594                 bootpc_compose_query(ifctx, gctx, td);
1595
1596         ifctx = gctx->interfaces;
1597         error = bootpc_call(gctx, td);
1598
1599         if (error != 0) {
1600 #ifdef BOOTP_NFSROOT
1601                 panic("BOOTP call failed");
1602 #else
1603                 kprintf("BOOTP call failed\n");
1604 #endif
1605         }
1606
1607         nfs_mountopts(&nd->root_args, NULL);
1608
1609         nfs_mountopts(&nd->swap_args, NULL);
1610
1611         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1612                 if (bootpc_ifctx_isresolved(ifctx) != 0)
1613                         bootpc_decode_reply(nd, ifctx, gctx);
1614
1615         if (gctx->gotswappath == 0)
1616                 nd->swap_nblks = 0;
1617 #ifdef BOOTP_NFSROOT
1618         if (gctx->gotrootpath == 0)
1619                 panic("bootpc: No root path offered");
1620 #endif
1621
1622         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next) {
1623                 bootpc_adjust_interface(ifctx, gctx, td);
1624
1625                 soclose(ifctx->so, FNONBLOCK);
1626         }
1627
1628         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = ifctx->next)
1629                 if (ifctx->gotrootpath != 0)
1630                         break;
1631         if (ifctx == NULL) {
1632                 for (ifctx = gctx->interfaces;
1633                      ifctx != NULL;
1634                      ifctx = ifctx->next)
1635                         if (bootpc_ifctx_isresolved(ifctx) != 0)
1636                                 break;
1637         }
1638         if (ifctx == NULL)
1639                 goto out;
1640
1641         if (gctx->gotrootpath != 0) {
1642
1643                 error = md_mount(&nd->root_saddr, nd->root_hostnam,
1644                                  nd->root_fh, &nd->root_fhsize,
1645                                  &nd->root_args, td);
1646                 if (error != 0)
1647                         panic("nfs_boot: mountd root, error=%d", error);
1648
1649                 if (gctx->gotswappath != 0) {
1650
1651                         error = md_mount(&nd->swap_saddr,
1652                                          nd->swap_hostnam,
1653                                          nd->swap_fh, &nd->swap_fhsize,
1654                                          &nd->swap_args, td);
1655                         if (error != 0)
1656                                 panic("nfs_boot: mountd swap, error=%d",
1657                                       error);
1658
1659                         error = md_lookup_swap(&nd->swap_saddr,
1660                                                gctx->lookup_path,
1661                                                nd->swap_fh, &nd->swap_fhsize,
1662                                                &nd->swap_args, td);
1663                         if (error != 0)
1664                                 panic("nfs_boot: lookup swap, error=%d",
1665                                       error);
1666                 }
1667                 nfs_diskless_valid = 3;
1668         }
1669
1670         strcpy(nd->myif.ifra_name, ifctx->ireq.ifr_name);
1671         bcopy(&ifctx->myaddr, &nd->myif.ifra_addr, sizeof(ifctx->myaddr));
1672         bcopy(&ifctx->myaddr, &nd->myif.ifra_broadaddr, sizeof(ifctx->myaddr));
1673         ((struct sockaddr_in *) &nd->myif.ifra_broadaddr)->sin_addr.s_addr =
1674                 ifctx->myaddr.sin_addr.s_addr |
1675                 ~ ifctx->netmask.sin_addr.s_addr;
1676         bcopy(&ifctx->netmask, &nd->myif.ifra_mask, sizeof(ifctx->netmask));
1677
1678 out:
1679         for (ifctx = gctx->interfaces; ifctx != NULL; ifctx = nctx) {
1680                 nctx = ifctx->next;
1681                 kfree(ifctx, M_TEMP);
1682         }
1683         kfree(gctx, M_TEMP);
1684 }
1685