net/bootp.c

   1 /*
   2  *      Based on LiMon - BOOTP.
   3  *
   4  *      Copyright 1994, 1995, 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2004 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 #if 0
  12 #define DEBUG           1       /* general debug */
  13 #define DEBUG_BOOTP_EXT 1       /* Debug received vendor fields */
  14 #endif
  15
  16 #ifdef DEBUG_BOOTP_EXT
  17 #define debug_ext(fmt,args...)  printf (fmt ,##args)
  18 #else
  19 #define debug_ext(fmt,args...)
  20 #endif
  21
  22 #include <common.h>
  23 #include <command.h>
  24 #include <net.h>
  25 #include "bootp.h"
  26 #include "tftp.h"
  27 #include "nfs.h"
  28 #ifdef CONFIG_STATUS_LED
  29 #include <status_led.h>
  30 #endif
  31
  32 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  33
  34 #if (CONFIG_COMMANDS & CFG_CMD_NET)
  35
  36 #define TIMEOUT         5               /* Seconds before trying BOOTP again    */
  37 #ifndef CONFIG_NET_RETRY_COUNT
  38 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  39 #else
  40 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  41 #endif
  42
  43 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  44 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  45
  46 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  47 #define CONFIG_DHCP_MIN_EXT_LEN 64
  48 #endif
  49
  50 ulong           BootpID;
  51 int             BootpTry;
  52 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  53 ulong           seed1, seed2;
  54 #endif
  55
  56 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
  57 dhcp_state_t dhcp_state = INIT;
  58 unsigned long dhcp_leasetime = 0;
  59 IPaddr_t NetDHCPServerIP = 0;
  60 static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len);
  61
  62 /* For Debug */
  63 #if 0
  64 static char *dhcpmsg2str(int type)
  65 {
  66         switch (type) {
  67         case 1:  return "DHCPDISCOVER"; break;
  68         case 2:  return "DHCPOFFER";    break;
  69         case 3:  return "DHCPREQUEST";  break;
  70         case 4:  return "DHCPDECLINE";  break;
  71         case 5:  return "DHCPACK";      break;
  72         case 6:  return "DHCPNACK";     break;
  73         case 7:  return "DHCPRELEASE";  break;
  74         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  75         }
  76 }
  77 #endif
  78
  79 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
  80 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  81 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  82 #endif
  83
  84 #endif  /* CFG_CMD_DHCP */
  85
  86 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  87 {
  88         Bootp_t *bp = (Bootp_t *) pkt;
  89         int retval = 0;
  90
  91         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  92                 retval = -1;
  93         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  94                 retval = -2;
  95         else if (bp->bp_op != OP_BOOTREQUEST &&
  96             bp->bp_op != OP_BOOTREPLY &&
  97             bp->bp_op != DHCP_OFFER &&
  98             bp->bp_op != DHCP_ACK &&
  99             bp->bp_op != DHCP_NAK ) {
 100                 retval = -3;
 101         }
 102         else if (bp->bp_htype != HWT_ETHER)
 103                 retval = -4;
 104         else if (bp->bp_hlen != HWL_ETHER)
 105                 retval = -5;
 106         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
 107                 retval = -6;
 108         }
 109
 110         debug ("Filtering pkt = %d\n", retval);
 111
 112         return retval;
 113 }
 114
 115 /*
 116  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 117  */
 118 static void BootpCopyNetParams(Bootp_t *bp)
 119 {
 120         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 121         NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 122         memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
 123         copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 124
 125         debug ("Bootfile: %s\n", BootFile);
 126
 127         /* Propagate to environment:
 128          * don't delete exising entry when BOOTP / DHCP reply does
 129          * not contain a new value
 130          */
 131         if (*BootFile) {
 132                 setenv ("bootfile", BootFile);
 133         }
 134 }
 135
 136 static int truncate_sz (const char *name, int maxlen, int curlen)
 137 {
 138         if (curlen >= maxlen) {
 139                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 140                         name, curlen, maxlen);
 141                 curlen = maxlen - 1;
 142         }
 143         return (curlen);
 144 }
 145
 146 #if !(CONFIG_COMMANDS & CFG_CMD_DHCP)
 147
 148 static void BootpVendorFieldProcess (u8 * ext)
 149 {
 150         int size = *(ext + 1);
 151
 152         debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 153                    *(ext + 1));
 154
 155         NetBootFileSize = 0;
 156
 157         switch (*ext) {
 158                 /* Fixed length fields */
 159         case 1:                 /* Subnet mask                                  */
 160                 if (NetOurSubnetMask == 0)
 161                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 162                 break;
 163         case 2:                 /* Time offset - Not yet supported              */
 164                 break;
 165                 /* Variable length fields */
 166         case 3:                 /* Gateways list                                */
 167                 if (NetOurGatewayIP == 0) {
 168                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 169                 }
 170                 break;
 171         case 4:                 /* Time server - Not yet supported              */
 172                 break;
 173         case 5:                 /* IEN-116 name server - Not yet supported      */
 174                 break;
 175         case 6:
 176                 if (NetOurDNSIP == 0) {
 177                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 178                 }
 179 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 180                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 181                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 182                 }
 183 #endif
 184                 break;
 185         case 7:                 /* Log server - Not yet supported               */
 186                 break;
 187         case 8:                 /* Cookie/Quote server - Not yet supported      */
 188                 break;
 189         case 9:                 /* LPR server - Not yet supported               */
 190                 break;
 191         case 10:                /* Impress server - Not yet supported           */
 192                 break;
 193         case 11:                /* RPL server - Not yet supported               */
 194                 break;
 195         case 12:                /* Host name                                    */
 196                 if (NetOurHostName[0] == 0) {
 197                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 198                         memcpy (&NetOurHostName, ext + 2, size);
 199                         NetOurHostName[size] = 0;
 200                 }
 201                 break;
 202         case 13:                /* Boot file size                               */
 203                 if (size == 2)
 204                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 205                 else if (size == 4)
 206                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 207                 break;
 208         case 14:                /* Merit dump file - Not yet supported          */
 209                 break;
 210         case 15:                /* Domain name - Not yet supported              */
 211                 break;
 212         case 16:                /* Swap server - Not yet supported              */
 213                 break;
 214         case 17:                /* Root path                                    */
 215                 if (NetOurRootPath[0] == 0) {
 216                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 217                         memcpy (&NetOurRootPath, ext + 2, size);
 218                         NetOurRootPath[size] = 0;
 219                 }
 220                 break;
 221         case 18:                /* Extension path - Not yet supported           */
 222                 /*
 223                  * This can be used to send the information of the
 224                  * vendor area in another file that the client can
 225                  * access via TFTP.
 226                  */
 227                 break;
 228                 /* IP host layer fields */
 229         case 40:                /* NIS Domain name                              */
 230                 if (NetOurNISDomain[0] == 0) {
 231                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 232                         memcpy (&NetOurNISDomain, ext + 2, size);
 233                         NetOurNISDomain[size] = 0;
 234                 }
 235                 break;
 236                 /* Application layer fields */
 237         case 43:                /* Vendor specific info - Not yet supported     */
 238                 /*
 239                  * Binary information to exchange specific
 240                  * product information.
 241                  */
 242                 break;
 243                 /* Reserved (custom) fields (128..254) */
 244         }
 245 }
 246
 247 static void BootpVendorProcess (u8 * ext, int size)
 248 {
 249         u8 *end = ext + size;
 250
 251         debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size);
 252
 253         while ((ext < end) && (*ext != 0xff)) {
 254                 if (*ext == 0) {
 255                         ext++;
 256                 } else {
 257                         u8 *opt = ext;
 258
 259                         ext += ext[1] + 2;
 260                         if (ext <= end)
 261                                 BootpVendorFieldProcess (opt);
 262                 }
 263         }
 264
 265 #ifdef DEBUG_BOOTP_EXT
 266         printf ("[BOOTP] Received fields: \n");
 267         if (NetOurSubnetMask) {
 268                 puts ("NetOurSubnetMask : ");
 269                 print_IPaddr (NetOurSubnetMask);
 270                 putc ('\n');
 271         }
 272
 273         if (NetOurGatewayIP) {
 274                 puts ("NetOurGatewayIP  : ");
 275                 print_IPaddr (NetOurGatewayIP);
 276                 putc ('\n');
 277         }
 278
 279         if (NetBootFileSize) {
 280                 printf ("NetBootFileSize : %d\n", NetBootFileSize);
 281         }
 282
 283         if (NetOurHostName[0]) {
 284                 printf ("NetOurHostName  : %s\n", NetOurHostName);
 285         }
 286
 287         if (NetOurRootPath[0]) {
 288                 printf ("NetOurRootPath  : %s\n", NetOurRootPath);
 289         }
 290
 291         if (NetOurNISDomain[0]) {
 292                 printf ("NetOurNISDomain : %s\n", NetOurNISDomain);
 293         }
 294
 295         if (NetBootFileSize) {
 296                 printf ("NetBootFileSize: %d\n", NetBootFileSize);
 297         }
 298 #endif /* DEBUG_BOOTP_EXT */
 299 }
 300 /*
 301  *      Handle a BOOTP received packet.
 302  */
 303 static void
 304 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 305 {
 306         Bootp_t *bp;
 307         char    *s;
 308
 309         debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
 310                 src, dest, len, sizeof (Bootp_t));
 311
 312         bp = (Bootp_t *)pkt;
 313
 314         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 315                 return;
 316
 317         /*
 318          *      Got a good BOOTP reply.  Copy the data into our variables.
 319          */
 320 #ifdef CONFIG_STATUS_LED
 321         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 322 #endif
 323
 324         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 325
 326         /* Retrieve extended information (we must parse the vendor area) */
 327         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 328                 BootpVendorProcess(&bp->bp_vend[4], len);
 329
 330         NetSetTimeout(0, (thand_f *)0);
 331
 332         debug ("Got good BOOTP\n");
 333
 334         if ((s = getenv("autoload")) != NULL) {
 335                 if (*s == 'n') {
 336                         /*
 337                          * Just use BOOTP to configure system;
 338                          * Do not use TFTP to load the bootfile.
 339                          */
 340                         NetState = NETLOOP_SUCCESS;
 341                         return;
 342 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 343                 } else if (strcmp(s, "NFS") == 0) {
 344                         /*
 345                          * Use NFS to load the bootfile.
 346                          */
 347                         NfsStart();
 348                         return;
 349 #endif
 350                 }
 351         }
 352
 353         TftpStart();
 354 }
 355 #endif  /* !CFG_CMD_DHCP */
 356
 357 /*
 358  *      Timeout on BOOTP/DHCP request.
 359  */
 360 static void
 361 BootpTimeout(void)
 362 {
 363         if (BootpTry >= TIMEOUT_COUNT) {
 364                 puts ("\nRetry count exceeded; starting again\n");
 365                 NetStartAgain ();
 366         } else {
 367                 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout);
 368                 BootpRequest ();
 369         }
 370 }
 371
 372 /*
 373  *      Initialize BOOTP extension fields in the request.
 374  */
 375 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 376 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 377 {
 378         u8 *start = e;
 379         u8 *cnt;
 380
 381 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 382         u8 *x;
 383 #endif
 384 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME)
 385         uchar *hostname;
 386 #endif
 387
 388         *e++ = 99;              /* RFC1048 Magic Cookie */
 389         *e++ = 130;
 390         *e++ = 83;
 391         *e++ = 99;
 392
 393         *e++ = 53;              /* DHCP Message Type */
 394         *e++ = 1;
 395         *e++ = message_type;
 396
 397         *e++ = 57;              /* Maximum DHCP Message Size */
 398         *e++ = 2;
 399         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 400         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 401
 402         if (ServerID) {
 403                 int tmp = ntohl (ServerID);
 404
 405                 *e++ = 54;      /* ServerID */
 406                 *e++ = 4;
 407                 *e++ = tmp >> 24;
 408                 *e++ = tmp >> 16;
 409                 *e++ = tmp >> 8;
 410                 *e++ = tmp & 0xff;
 411         }
 412
 413         if (RequestedIP) {
 414                 int tmp = ntohl (RequestedIP);
 415
 416                 *e++ = 50;      /* Requested IP */
 417                 *e++ = 4;
 418                 *e++ = tmp >> 24;
 419                 *e++ = tmp >> 16;
 420                 *e++ = tmp >> 8;
 421                 *e++ = tmp & 0xff;
 422         }
 423 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME)
 424         if ((hostname = getenv ("hostname"))) {
 425                 int hostnamelen = strlen (hostname);
 426
 427                 *e++ = 12;      /* Hostname */
 428                 *e++ = hostnamelen;
 429                 memcpy (e, hostname, hostnamelen);
 430                 e += hostnamelen;
 431         }
 432 #endif
 433
 434 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 435         if ((x = dhcp_vendorex_prep (e)))
 436                 return x - start;
 437 #endif
 438
 439         *e++ = 55;              /* Parameter Request List */
 440          cnt = e++;             /* Pointer to count of requested items */
 441         *cnt = 0;
 442 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 443         *e++  = 1;              /* Subnet Mask */
 444         *cnt += 1;
 445 #endif
 446 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 447         *e++  = 3;              /* Router Option */
 448         *cnt += 1;
 449 #endif
 450 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 451         *e++  = 6;              /* DNS Server(s) */
 452         *cnt += 1;
 453 #endif
 454 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 455         *e++  = 12;             /* Hostname */
 456         *cnt += 1;
 457 #endif
 458 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 459         *e++  = 13;             /* Boot File Size */
 460         *cnt += 1;
 461 #endif
 462 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 463         *e++  = 17;             /* Boot path */
 464         *cnt += 1;
 465 #endif
 466 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 467         *e++  = 40;             /* NIS Domain name request */
 468         *cnt += 1;
 469 #endif
 470         *e++  = 255;            /* End of the list */
 471
 472         /* Pad to minimal length */
 473 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 474         while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
 475                 *e++ = 0;
 476 #endif
 477
 478         return e - start;
 479 }
 480
 481 #else   /* CFG_CMD_DHCP */
 482 /*
 483  *      Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
 484  */
 485 static int BootpExtended (u8 * e)
 486 {
 487         u8 *start = e;
 488
 489         *e++ = 99;              /* RFC1048 Magic Cookie */
 490         *e++ = 130;
 491         *e++ = 83;
 492         *e++ = 99;
 493
 494 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 495         *e++ = 53;              /* DHCP Message Type */
 496         *e++ = 1;
 497         *e++ = DHCP_DISCOVER;
 498
 499         *e++ = 57;              /* Maximum DHCP Message Size */
 500         *e++ = 2;
 501         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 502         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 503 #endif /* CFG_CMD_DHCP */
 504
 505 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 506         *e++ = 1;               /* Subnet mask request */
 507         *e++ = 4;
 508         e   += 4;
 509 #endif
 510
 511 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 512         *e++ = 3;               /* Default gateway request */
 513         *e++ = 4;
 514         e   += 4;
 515 #endif
 516
 517 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 518         *e++ = 6;               /* Domain Name Server */
 519         *e++ = 4;
 520         e   += 4;
 521 #endif
 522
 523 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 524         *e++ = 12;              /* Host name request */
 525         *e++ = 32;
 526         e   += 32;
 527 #endif
 528
 529 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 530         *e++ = 13;              /* Boot file size */
 531         *e++ = 2;
 532         e   += 2;
 533 #endif
 534
 535 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 536         *e++ = 17;              /* Boot path */
 537         *e++ = 32;
 538         e   += 32;
 539 #endif
 540
 541 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 542         *e++ = 40;              /* NIS Domain name request */
 543         *e++ = 32;
 544         e   += 32;
 545 #endif
 546
 547         *e++ = 255;             /* End of the list */
 548
 549         return e - start;
 550 }
 551 #endif  /* CFG_CMD_DHCP */
 552
 553 void
 554 BootpRequest (void)
 555 {
 556         volatile uchar *pkt, *iphdr;
 557         Bootp_t *bp;
 558         int ext_len, pktlen, iplen;
 559
 560 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 561         dhcp_state = INIT;
 562 #endif
 563
 564 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 565         unsigned char bi_enetaddr[6];
 566         int   reg;
 567         char  *e,*s;
 568         uchar tmp[64];
 569         ulong tst1, tst2, sum, m_mask, m_value = 0;
 570
 571         if (BootpTry ==0) {
 572                 /* get our mac */
 573                 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
 574                 s = (reg > 0) ? tmp : NULL;
 575
 576                 for (reg=0; reg<6; ++reg) {
 577                         bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
 578                         if (s) {
 579                                 s = (*e) ? e+1 : e;
 580                         }
 581                 }
 582 #ifdef DEBUG
 583                 printf("BootpRequest => Our Mac: ");
 584                 for (reg=0; reg<6; reg++) {
 585                         printf ("%x%c",
 586                                 bi_enetaddr[reg],
 587                                 reg==5 ? '\n' : ':');
 588                 }
 589 #endif /* DEBUG */
 590
 591                 /* Mac-Manipulation 2 get seed1 */
 592                 tst1=0;
 593                 tst2=0;
 594                 for (reg=2; reg<6; reg++) {
 595                         tst1 = tst1 << 8;
 596                         tst1 = tst1 | bi_enetaddr[reg];
 597                 }
 598                 for (reg=0; reg<2; reg++) {
 599                         tst2 = tst2 | bi_enetaddr[reg];
 600                         tst2 = tst2 << 8;
 601                 }
 602
 603                 seed1 = tst1^tst2;
 604
 605                 /* Mirror seed1*/
 606                 m_mask=0x1;
 607                 for (reg=1;reg<=32;reg++) {
 608                         m_value |= (m_mask & seed1);
 609                         seed1 = seed1 >> 1;
 610                         m_value = m_value << 1;
 611                 }
 612                 seed1 = m_value;
 613                 seed2 = 0xB78D0945;
 614         }
 615
 616         /* Random Number Generator */
 617
 618         for (reg=0;reg<=0;reg++) {
 619                 sum = seed1 + seed2;
 620                 if (sum < seed1 || sum < seed2)
 621                         sum++;
 622                 seed2 = seed1;
 623                 seed1 = sum;
 624
 625                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 626                         sum = sum >> (22-BootpTry);
 627                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 628                         sum = sum >> 19;
 629                 }
 630         }
 631
 632         printf ("Random delay: %ld ms...\n", sum);
 633         for (reg=0; reg <sum; reg++) {
 634                 udelay(1000); /*Wait 1ms*/
 635         }
 636 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 637
 638         printf("BOOTP broadcast %d\n", ++BootpTry);
 639         pkt = NetTxPacket;
 640         memset ((void*)pkt, 0, PKTSIZE);
 641
 642         NetSetEther(pkt, NetBcastAddr, PROT_IP);
 643         pkt += ETHER_HDR_SIZE;
 644
 645         /*
 646          * Next line results in incorrect packet size being transmitted, resulting
 647          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 648          * set in packet header after extension length has been determined.
 649          * C. Hallinan, DS4.COM, Inc.
 650          */
 651         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 652         iphdr = pkt;    /* We need this later for NetSetIP() */
 653         pkt += IP_HDR_SIZE;
 654
 655         bp = (Bootp_t *)pkt;
 656         bp->bp_op = OP_BOOTREQUEST;
 657         bp->bp_htype = HWT_ETHER;
 658         bp->bp_hlen = HWL_ETHER;
 659         bp->bp_hops = 0;
 660         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 661         NetWriteIP(&bp->bp_ciaddr, 0);
 662         NetWriteIP(&bp->bp_yiaddr, 0);
 663         NetWriteIP(&bp->bp_siaddr, 0);
 664         NetWriteIP(&bp->bp_giaddr, 0);
 665         memcpy (bp->bp_chaddr, NetOurEther, 6);
 666         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 667
 668         /* Request additional information from the BOOTP/DHCP server */
 669 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 670         ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
 671 #else
 672         ext_len = BootpExtended(bp->bp_vend);
 673 #endif  /* CFG_CMD_DHCP */
 674
 675         /*
 676          *      Bootp ID is the lower 4 bytes of our ethernet address
 677          *      plus the current time in HZ.
 678          */
 679         BootpID = ((ulong)NetOurEther[2] << 24)
 680                 | ((ulong)NetOurEther[3] << 16)
 681                 | ((ulong)NetOurEther[4] << 8)
 682                 | (ulong)NetOurEther[5];
 683         BootpID += get_timer(0);
 684         BootpID  = htonl(BootpID);
 685         NetCopyLong(&bp->bp_id, &BootpID);
 686
 687         /*
 688          * Calculate proper packet lengths taking into account the
 689          * variable size of the options field
 690          */
 691         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
 692         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 693         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 694         NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
 695
 696 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 697         dhcp_state = SELECTING;
 698         NetSetHandler(DhcpHandler);
 699 #else
 700         NetSetHandler(BootpHandler);
 701 #endif  /* CFG_CMD_DHCP */
 702         NetSendPacket(NetTxPacket, pktlen);
 703 }
 704
 705 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 706 static void DhcpOptionsProcess (uchar * popt)
 707 {
 708         uchar *end = popt + BOOTP_HDR_SIZE;
 709         int oplen, size;
 710
 711         while (popt < end && *popt != 0xff) {
 712                 oplen = *(popt + 1);
 713                 switch (*popt) {
 714                 case 1:
 715                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 716                         break;
 717                 case 3:
 718                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 719                         break;
 720                 case 6:
 721                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 722 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 723                         if (*(popt + 1) > 4) {
 724                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 725                         }
 726 #endif
 727                         break;
 728                 case 12:
 729                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 730                         memcpy (&NetOurHostName, popt + 2, size);
 731                         NetOurHostName[size] = 0;
 732                         break;
 733                 case 15:        /* Ignore Domain Name Option */
 734                         break;
 735                 case 17:
 736                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 737                         memcpy (&NetOurRootPath, popt + 2, size);
 738                         NetOurRootPath[size] = 0;
 739                         break;
 740                 case 51:
 741                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 742                         break;
 743                 case 53:        /* Ignore Message Type Option */
 744                         break;
 745                 case 54:
 746                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 747                         break;
 748                 case 58:        /* Ignore Renewal Time Option */
 749                         break;
 750                 case 59:        /* Ignore Rebinding Time Option */
 751                         break;
 752                 default:
 753 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 754                         if (dhcp_vendorex_proc (popt))
 755                                 break;
 756 #endif
 757                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 758                         break;
 759                 }
 760                 popt += oplen + 2;      /* Process next option */
 761         }
 762 }
 763
 764 static int DhcpMessageType(unsigned char *popt)
 765 {
 766         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 767                 return -1;
 768
 769         popt += 4;
 770         while ( *popt != 0xff ) {
 771                 if ( *popt == 53 )      /* DHCP Message Type */
 772                         return *(popt + 2);
 773                 popt += *(popt + 1) + 2;        /* Scan through all options */
 774         }
 775         return -1;
 776 }
 777
 778 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 779 {
 780         volatile uchar *pkt, *iphdr;
 781         Bootp_t *bp;
 782         int pktlen, iplen, extlen;
 783         IPaddr_t OfferedIP;
 784
 785         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 786         pkt = NetTxPacket;
 787         memset ((void*)pkt, 0, PKTSIZE);
 788
 789         NetSetEther(pkt, NetBcastAddr, PROT_IP);
 790         pkt += ETHER_HDR_SIZE;
 791
 792         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 793         pkt += IP_HDR_SIZE;
 794
 795         bp = (Bootp_t *)pkt;
 796         bp->bp_op = OP_BOOTREQUEST;
 797         bp->bp_htype = HWT_ETHER;
 798         bp->bp_hlen = HWL_ETHER;
 799         bp->bp_hops = 0;
 800         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 801         NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
 802         NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
 803         NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
 804         NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr);
 805         memcpy (bp->bp_chaddr, NetOurEther, 6);
 806
 807         /*
 808          * ID is the id of the OFFER packet
 809          */
 810
 811         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 812
 813         /*
 814          * Copy options from OFFER packet if present
 815          */
 816         NetCopyIP(&OfferedIP, &bp->bp_yiaddr);
 817         extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 818
 819         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
 820         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 821         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 822
 823         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 824         NetSendPacket(NetTxPacket, pktlen);
 825 }
 826
 827 /*
 828  *      Handle DHCP received packets.
 829  */
 830 static void
 831 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 832 {
 833         Bootp_t *bp = (Bootp_t *)pkt;
 834
 835         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 836                 src, dest, len, dhcp_state);
 837
 838         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 839                 return;
 840
 841         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 842                 src, dest, len, dhcp_state);
 843
 844         switch (dhcp_state) {
 845         case SELECTING:
 846                 /*
 847                  * Wait an appropriate time for any potential DHCPOFFER packets
 848                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 849                  * If filename is in format we recognize, assume it is a valid
 850                  * OFFER from a server we want.
 851                  */
 852                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 853 #ifdef CFG_BOOTFILE_PREFIX
 854                 if (strncmp(bp->bp_file,
 855                             CFG_BOOTFILE_PREFIX,
 856                             strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
 857 #endif  /* CFG_BOOTFILE_PREFIX */
 858
 859                         debug ("TRANSITIONING TO REQUESTING STATE\n");
 860                         dhcp_state = REQUESTING;
 861
 862                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 863                                 DhcpOptionsProcess(&bp->bp_vend[4]);
 864
 865                         BootpCopyNetParams(bp); /* Store net params from reply */
 866
 867                         NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
 868                         DhcpSendRequestPkt(bp);
 869 #ifdef CFG_BOOTFILE_PREFIX
 870                 }
 871 #endif  /* CFG_BOOTFILE_PREFIX */
 872
 873                 return;
 874                 break;
 875         case REQUESTING:
 876                 debug ("DHCP State: REQUESTING\n");
 877
 878                 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) {
 879                         char *s;
 880
 881                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 882                                 DhcpOptionsProcess(&bp->bp_vend[4]);
 883                         BootpCopyNetParams(bp); /* Store net params from reply */
 884                         dhcp_state = BOUND;
 885                         printf("DHCP client bound to address ");
 886                         print_IPaddr(NetOurIP);
 887                         printf("\n");
 888
 889                         /* Obey the 'autoload' setting */
 890                         if ((s = getenv("autoload")) != NULL) {
 891                                 if (*s == 'n') {
 892                                         /*
 893                                          * Just use BOOTP to configure system;
 894                                          * Do not use TFTP to load the bootfile.
 895                                          */
 896                                         NetState = NETLOOP_SUCCESS;
 897                                         return;
 898 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 899                                 } else if (strcmp(s, "NFS") == 0) {
 900                                         /*
 901                                          * Use NFS to load the bootfile.
 902                                          */
 903                                         NfsStart();
 904                                         return;
 905 #endif
 906                                 }
 907                         }
 908                         TftpStart();
 909                         return;
 910                 }
 911                 break;
 912         default:
 913                 printf("DHCP: INVALID STATE\n");
 914                 break;
 915         }
 916
 917 }
 918
 919 void DhcpRequest(void)
 920 {
 921         BootpRequest();
 922 }
 923 #endif  /* CFG_CMD_DHCP */
 924
 925 #endif /* CFG_CMD_NET */