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         IPaddr_t tmp_ip;
 121
 122         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 123         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 124         if (tmp_ip != 0)
 125                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 126         memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
 127         if (strlen(bp->bp_file) > 0)
 128                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 129
 130         debug ("Bootfile: %s\n", BootFile);
 131
 132         /* Propagate to environment:
 133          * don't delete exising entry when BOOTP / DHCP reply does
 134          * not contain a new value
 135          */
 136         if (*BootFile) {
 137                 setenv ("bootfile", BootFile);
 138         }
 139 }
 140
 141 static int truncate_sz (const char *name, int maxlen, int curlen)
 142 {
 143         if (curlen >= maxlen) {
 144                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 145                         name, curlen, maxlen);
 146                 curlen = maxlen - 1;
 147         }
 148         return (curlen);
 149 }
 150
 151 #if !(CONFIG_COMMANDS & CFG_CMD_DHCP)
 152
 153 static void BootpVendorFieldProcess (u8 * ext)
 154 {
 155         int size = *(ext + 1);
 156
 157         debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 158                    *(ext + 1));
 159
 160         NetBootFileSize = 0;
 161
 162         switch (*ext) {
 163                 /* Fixed length fields */
 164         case 1:                 /* Subnet mask                                  */
 165                 if (NetOurSubnetMask == 0)
 166                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 167                 break;
 168         case 2:                 /* Time offset - Not yet supported              */
 169                 break;
 170                 /* Variable length fields */
 171         case 3:                 /* Gateways list                                */
 172                 if (NetOurGatewayIP == 0) {
 173                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 174                 }
 175                 break;
 176         case 4:                 /* Time server - Not yet supported              */
 177                 break;
 178         case 5:                 /* IEN-116 name server - Not yet supported      */
 179                 break;
 180         case 6:
 181                 if (NetOurDNSIP == 0) {
 182                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 183                 }
 184 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 185                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 186                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 187                 }
 188 #endif
 189                 break;
 190         case 7:                 /* Log server - Not yet supported               */
 191                 break;
 192         case 8:                 /* Cookie/Quote server - Not yet supported      */
 193                 break;
 194         case 9:                 /* LPR server - Not yet supported               */
 195                 break;
 196         case 10:                /* Impress server - Not yet supported           */
 197                 break;
 198         case 11:                /* RPL server - Not yet supported               */
 199                 break;
 200         case 12:                /* Host name                                    */
 201                 if (NetOurHostName[0] == 0) {
 202                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 203                         memcpy (&NetOurHostName, ext + 2, size);
 204                         NetOurHostName[size] = 0;
 205                 }
 206                 break;
 207         case 13:                /* Boot file size                               */
 208                 if (size == 2)
 209                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 210                 else if (size == 4)
 211                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 212                 break;
 213         case 14:                /* Merit dump file - Not yet supported          */
 214                 break;
 215         case 15:                /* Domain name - Not yet supported              */
 216                 break;
 217         case 16:                /* Swap server - Not yet supported              */
 218                 break;
 219         case 17:                /* Root path                                    */
 220                 if (NetOurRootPath[0] == 0) {
 221                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 222                         memcpy (&NetOurRootPath, ext + 2, size);
 223                         NetOurRootPath[size] = 0;
 224                 }
 225                 break;
 226         case 18:                /* Extension path - Not yet supported           */
 227                 /*
 228                  * This can be used to send the information of the
 229                  * vendor area in another file that the client can
 230                  * access via TFTP.
 231                  */
 232                 break;
 233                 /* IP host layer fields */
 234         case 40:                /* NIS Domain name                              */
 235                 if (NetOurNISDomain[0] == 0) {
 236                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 237                         memcpy (&NetOurNISDomain, ext + 2, size);
 238                         NetOurNISDomain[size] = 0;
 239                 }
 240                 break;
 241                 /* Application layer fields */
 242         case 43:                /* Vendor specific info - Not yet supported     */
 243                 /*
 244                  * Binary information to exchange specific
 245                  * product information.
 246                  */
 247                 break;
 248                 /* Reserved (custom) fields (128..254) */
 249         }
 250 }
 251
 252 static void BootpVendorProcess (u8 * ext, int size)
 253 {
 254         u8 *end = ext + size;
 255
 256         debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size);
 257
 258         while ((ext < end) && (*ext != 0xff)) {
 259                 if (*ext == 0) {
 260                         ext++;
 261                 } else {
 262                         u8 *opt = ext;
 263
 264                         ext += ext[1] + 2;
 265                         if (ext <= end)
 266                                 BootpVendorFieldProcess (opt);
 267                 }
 268         }
 269
 270 #ifdef DEBUG_BOOTP_EXT
 271         puts ("[BOOTP] Received fields: \n");
 272         if (NetOurSubnetMask) {
 273                 puts ("NetOurSubnetMask : ");
 274                 print_IPaddr (NetOurSubnetMask);
 275                 putc ('\n');
 276         }
 277
 278         if (NetOurGatewayIP) {
 279                 puts ("NetOurGatewayIP  : ");
 280                 print_IPaddr (NetOurGatewayIP);
 281                 putc ('\n');
 282         }
 283
 284         if (NetBootFileSize) {
 285                 printf ("NetBootFileSize : %d\n", NetBootFileSize);
 286         }
 287
 288         if (NetOurHostName[0]) {
 289                 printf ("NetOurHostName  : %s\n", NetOurHostName);
 290         }
 291
 292         if (NetOurRootPath[0]) {
 293                 printf ("NetOurRootPath  : %s\n", NetOurRootPath);
 294         }
 295
 296         if (NetOurNISDomain[0]) {
 297                 printf ("NetOurNISDomain : %s\n", NetOurNISDomain);
 298         }
 299
 300         if (NetBootFileSize) {
 301                 printf ("NetBootFileSize: %d\n", NetBootFileSize);
 302         }
 303 #endif /* DEBUG_BOOTP_EXT */
 304 }
 305 /*
 306  *      Handle a BOOTP received packet.
 307  */
 308 static void
 309 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 310 {
 311         Bootp_t *bp;
 312         char    *s;
 313
 314         debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
 315                 src, dest, len, sizeof (Bootp_t));
 316
 317         bp = (Bootp_t *)pkt;
 318
 319         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 320                 return;
 321
 322         /*
 323          *      Got a good BOOTP reply.  Copy the data into our variables.
 324          */
 325 #ifdef CONFIG_STATUS_LED
 326         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 327 #endif
 328
 329         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 330
 331         /* Retrieve extended information (we must parse the vendor area) */
 332         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 333                 BootpVendorProcess(&bp->bp_vend[4], len);
 334
 335         NetSetTimeout(0, (thand_f *)0);
 336
 337         debug ("Got good BOOTP\n");
 338
 339         if ((s = getenv("autoload")) != NULL) {
 340                 if (*s == 'n') {
 341                         /*
 342                          * Just use BOOTP to configure system;
 343                          * Do not use TFTP to load the bootfile.
 344                          */
 345                         NetState = NETLOOP_SUCCESS;
 346                         return;
 347 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 348                 } else if (strcmp(s, "NFS") == 0) {
 349                         /*
 350                          * Use NFS to load the bootfile.
 351                          */
 352                         NfsStart();
 353                         return;
 354 #endif
 355                 }
 356         }
 357
 358         TftpStart();
 359 }
 360 #endif  /* !CFG_CMD_DHCP */
 361
 362 /*
 363  *      Timeout on BOOTP/DHCP request.
 364  */
 365 static void
 366 BootpTimeout(void)
 367 {
 368         if (BootpTry >= TIMEOUT_COUNT) {
 369                 puts ("\nRetry count exceeded; starting again\n");
 370                 NetStartAgain ();
 371         } else {
 372                 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout);
 373                 BootpRequest ();
 374         }
 375 }
 376
 377 /*
 378  *      Initialize BOOTP extension fields in the request.
 379  */
 380 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 381 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 382 {
 383         u8 *start = e;
 384         u8 *cnt;
 385
 386 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 387         u8 *x;
 388 #endif
 389 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME)
 390         uchar *hostname;
 391 #endif
 392
 393         *e++ = 99;              /* RFC1048 Magic Cookie */
 394         *e++ = 130;
 395         *e++ = 83;
 396         *e++ = 99;
 397
 398         *e++ = 53;              /* DHCP Message Type */
 399         *e++ = 1;
 400         *e++ = message_type;
 401
 402         *e++ = 57;              /* Maximum DHCP Message Size */
 403         *e++ = 2;
 404         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 405         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 406
 407         if (ServerID) {
 408                 int tmp = ntohl (ServerID);
 409
 410                 *e++ = 54;      /* ServerID */
 411                 *e++ = 4;
 412                 *e++ = tmp >> 24;
 413                 *e++ = tmp >> 16;
 414                 *e++ = tmp >> 8;
 415                 *e++ = tmp & 0xff;
 416         }
 417
 418         if (RequestedIP) {
 419                 int tmp = ntohl (RequestedIP);
 420
 421                 *e++ = 50;      /* Requested IP */
 422                 *e++ = 4;
 423                 *e++ = tmp >> 24;
 424                 *e++ = tmp >> 16;
 425                 *e++ = tmp >> 8;
 426                 *e++ = tmp & 0xff;
 427         }
 428 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SEND_HOSTNAME)
 429         if ((hostname = getenv ("hostname"))) {
 430                 int hostnamelen = strlen (hostname);
 431
 432                 *e++ = 12;      /* Hostname */
 433                 *e++ = hostnamelen;
 434                 memcpy (e, hostname, hostnamelen);
 435                 e += hostnamelen;
 436         }
 437 #endif
 438
 439 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 440         if ((x = dhcp_vendorex_prep (e)))
 441                 return x - start;
 442 #endif
 443
 444         *e++ = 55;              /* Parameter Request List */
 445          cnt = e++;             /* Pointer to count of requested items */
 446         *cnt = 0;
 447 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 448         *e++  = 1;              /* Subnet Mask */
 449         *cnt += 1;
 450 #endif
 451 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 452         *e++  = 3;              /* Router Option */
 453         *cnt += 1;
 454 #endif
 455 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 456         *e++  = 6;              /* DNS Server(s) */
 457         *cnt += 1;
 458 #endif
 459 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 460         *e++  = 12;             /* Hostname */
 461         *cnt += 1;
 462 #endif
 463 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 464         *e++  = 13;             /* Boot File Size */
 465         *cnt += 1;
 466 #endif
 467 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 468         *e++  = 17;             /* Boot path */
 469         *cnt += 1;
 470 #endif
 471 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 472         *e++  = 40;             /* NIS Domain name request */
 473         *cnt += 1;
 474 #endif
 475         *e++  = 255;            /* End of the list */
 476
 477         /* Pad to minimal length */
 478 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 479         while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
 480                 *e++ = 0;
 481 #endif
 482
 483         return e - start;
 484 }
 485
 486 #else   /* CFG_CMD_DHCP */
 487 /*
 488  *      Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
 489  */
 490 static int BootpExtended (u8 * e)
 491 {
 492         u8 *start = e;
 493
 494         *e++ = 99;              /* RFC1048 Magic Cookie */
 495         *e++ = 130;
 496         *e++ = 83;
 497         *e++ = 99;
 498
 499 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 500         *e++ = 53;              /* DHCP Message Type */
 501         *e++ = 1;
 502         *e++ = DHCP_DISCOVER;
 503
 504         *e++ = 57;              /* Maximum DHCP Message Size */
 505         *e++ = 2;
 506         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 507         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 508 #endif /* CFG_CMD_DHCP */
 509
 510 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 511         *e++ = 1;               /* Subnet mask request */
 512         *e++ = 4;
 513         e   += 4;
 514 #endif
 515
 516 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 517         *e++ = 3;               /* Default gateway request */
 518         *e++ = 4;
 519         e   += 4;
 520 #endif
 521
 522 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 523         *e++ = 6;               /* Domain Name Server */
 524         *e++ = 4;
 525         e   += 4;
 526 #endif
 527
 528 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 529         *e++ = 12;              /* Host name request */
 530         *e++ = 32;
 531         e   += 32;
 532 #endif
 533
 534 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 535         *e++ = 13;              /* Boot file size */
 536         *e++ = 2;
 537         e   += 2;
 538 #endif
 539
 540 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 541         *e++ = 17;              /* Boot path */
 542         *e++ = 32;
 543         e   += 32;
 544 #endif
 545
 546 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 547         *e++ = 40;              /* NIS Domain name request */
 548         *e++ = 32;
 549         e   += 32;
 550 #endif
 551
 552         *e++ = 255;             /* End of the list */
 553
 554         return e - start;
 555 }
 556 #endif  /* CFG_CMD_DHCP */
 557
 558 void
 559 BootpRequest (void)
 560 {
 561         volatile uchar *pkt, *iphdr;
 562         Bootp_t *bp;
 563         int ext_len, pktlen, iplen;
 564
 565 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 566         dhcp_state = INIT;
 567 #endif
 568
 569 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 570         unsigned char bi_enetaddr[6];
 571         int   reg;
 572         char  *e,*s;
 573         uchar tmp[64];
 574         ulong tst1, tst2, sum, m_mask, m_value = 0;
 575
 576         if (BootpTry ==0) {
 577                 /* get our mac */
 578                 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
 579                 s = (reg > 0) ? tmp : NULL;
 580
 581                 for (reg=0; reg<6; ++reg) {
 582                         bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
 583                         if (s) {
 584                                 s = (*e) ? e+1 : e;
 585                         }
 586                 }
 587 #ifdef DEBUG
 588                 puts ("BootpRequest => Our Mac: ");
 589                 for (reg=0; reg<6; reg++) {
 590                         printf ("%x%c",
 591                                 bi_enetaddr[reg],
 592                                 reg==5 ? '\n' : ':');
 593                 }
 594 #endif /* DEBUG */
 595
 596                 /* Mac-Manipulation 2 get seed1 */
 597                 tst1=0;
 598                 tst2=0;
 599                 for (reg=2; reg<6; reg++) {
 600                         tst1 = tst1 << 8;
 601                         tst1 = tst1 | bi_enetaddr[reg];
 602                 }
 603                 for (reg=0; reg<2; reg++) {
 604                         tst2 = tst2 | bi_enetaddr[reg];
 605                         tst2 = tst2 << 8;
 606                 }
 607
 608                 seed1 = tst1^tst2;
 609
 610                 /* Mirror seed1*/
 611                 m_mask=0x1;
 612                 for (reg=1;reg<=32;reg++) {
 613                         m_value |= (m_mask & seed1);
 614                         seed1 = seed1 >> 1;
 615                         m_value = m_value << 1;
 616                 }
 617                 seed1 = m_value;
 618                 seed2 = 0xB78D0945;
 619         }
 620
 621         /* Random Number Generator */
 622
 623         for (reg=0;reg<=0;reg++) {
 624                 sum = seed1 + seed2;
 625                 if (sum < seed1 || sum < seed2)
 626                         sum++;
 627                 seed2 = seed1;
 628                 seed1 = sum;
 629
 630                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 631                         sum = sum >> (22-BootpTry);
 632                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 633                         sum = sum >> 19;
 634                 }
 635         }
 636
 637         printf ("Random delay: %ld ms...\n", sum);
 638         for (reg=0; reg <sum; reg++) {
 639                 udelay(1000); /*Wait 1ms*/
 640         }
 641 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 642
 643         printf("BOOTP broadcast %d\n", ++BootpTry);
 644         pkt = NetTxPacket;
 645         memset ((void*)pkt, 0, PKTSIZE);
 646
 647         NetSetEther(pkt, NetBcastAddr, PROT_IP);
 648         pkt += ETHER_HDR_SIZE;
 649
 650         /*
 651          * Next line results in incorrect packet size being transmitted, resulting
 652          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 653          * set in packet header after extension length has been determined.
 654          * C. Hallinan, DS4.COM, Inc.
 655          */
 656         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 657         iphdr = pkt;    /* We need this later for NetSetIP() */
 658         pkt += IP_HDR_SIZE;
 659
 660         bp = (Bootp_t *)pkt;
 661         bp->bp_op = OP_BOOTREQUEST;
 662         bp->bp_htype = HWT_ETHER;
 663         bp->bp_hlen = HWL_ETHER;
 664         bp->bp_hops = 0;
 665         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 666         NetWriteIP(&bp->bp_ciaddr, 0);
 667         NetWriteIP(&bp->bp_yiaddr, 0);
 668         NetWriteIP(&bp->bp_siaddr, 0);
 669         NetWriteIP(&bp->bp_giaddr, 0);
 670         memcpy (bp->bp_chaddr, NetOurEther, 6);
 671         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 672
 673         /* Request additional information from the BOOTP/DHCP server */
 674 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 675         ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
 676 #else
 677         ext_len = BootpExtended(bp->bp_vend);
 678 #endif  /* CFG_CMD_DHCP */
 679
 680         /*
 681          *      Bootp ID is the lower 4 bytes of our ethernet address
 682          *      plus the current time in HZ.
 683          */
 684         BootpID = ((ulong)NetOurEther[2] << 24)
 685                 | ((ulong)NetOurEther[3] << 16)
 686                 | ((ulong)NetOurEther[4] << 8)
 687                 | (ulong)NetOurEther[5];
 688         BootpID += get_timer(0);
 689         BootpID  = htonl(BootpID);
 690         NetCopyLong(&bp->bp_id, &BootpID);
 691
 692         /*
 693          * Calculate proper packet lengths taking into account the
 694          * variable size of the options field
 695          */
 696         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
 697         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 698         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 699         NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
 700
 701 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 702         dhcp_state = SELECTING;
 703         NetSetHandler(DhcpHandler);
 704 #else
 705         NetSetHandler(BootpHandler);
 706 #endif  /* CFG_CMD_DHCP */
 707         NetSendPacket(NetTxPacket, pktlen);
 708 }
 709
 710 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 711 static void DhcpOptionsProcess (uchar * popt)
 712 {
 713         uchar *end = popt + BOOTP_HDR_SIZE;
 714         int oplen, size;
 715
 716         while (popt < end && *popt != 0xff) {
 717                 oplen = *(popt + 1);
 718                 switch (*popt) {
 719                 case 1:
 720                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 721                         break;
 722                 case 3:
 723                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 724                         break;
 725                 case 6:
 726                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 727 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 728                         if (*(popt + 1) > 4) {
 729                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 730                         }
 731 #endif
 732                         break;
 733                 case 12:
 734                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 735                         memcpy (&NetOurHostName, popt + 2, size);
 736                         NetOurHostName[size] = 0;
 737                         break;
 738                 case 15:        /* Ignore Domain Name Option */
 739                         break;
 740                 case 17:
 741                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 742                         memcpy (&NetOurRootPath, popt + 2, size);
 743                         NetOurRootPath[size] = 0;
 744                         break;
 745                 case 51:
 746                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 747                         break;
 748                 case 53:        /* Ignore Message Type Option */
 749                         break;
 750                 case 54:
 751                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 752                         break;
 753                 case 58:        /* Ignore Renewal Time Option */
 754                         break;
 755                 case 59:        /* Ignore Rebinding Time Option */
 756                         break;
 757                 default:
 758 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 759                         if (dhcp_vendorex_proc (popt))
 760                                 break;
 761 #endif
 762                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 763                         break;
 764                 }
 765                 popt += oplen + 2;      /* Process next option */
 766         }
 767 }
 768
 769 static int DhcpMessageType(unsigned char *popt)
 770 {
 771         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 772                 return -1;
 773
 774         popt += 4;
 775         while ( *popt != 0xff ) {
 776                 if ( *popt == 53 )      /* DHCP Message Type */
 777                         return *(popt + 2);
 778                 popt += *(popt + 1) + 2;        /* Scan through all options */
 779         }
 780         return -1;
 781 }
 782
 783 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 784 {
 785         volatile uchar *pkt, *iphdr;
 786         Bootp_t *bp;
 787         int pktlen, iplen, extlen;
 788         IPaddr_t OfferedIP;
 789
 790         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 791         pkt = NetTxPacket;
 792         memset ((void*)pkt, 0, PKTSIZE);
 793
 794         NetSetEther(pkt, NetBcastAddr, PROT_IP);
 795         pkt += ETHER_HDR_SIZE;
 796
 797         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 798         pkt += IP_HDR_SIZE;
 799
 800         bp = (Bootp_t *)pkt;
 801         bp->bp_op = OP_BOOTREQUEST;
 802         bp->bp_htype = HWT_ETHER;
 803         bp->bp_hlen = HWL_ETHER;
 804         bp->bp_hops = 0;
 805         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 806         NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
 807         NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
 808         NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
 809         NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr);
 810         memcpy (bp->bp_chaddr, NetOurEther, 6);
 811
 812         /*
 813          * ID is the id of the OFFER packet
 814          */
 815
 816         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 817
 818         /*
 819          * Copy options from OFFER packet if present
 820          */
 821         NetCopyIP(&OfferedIP, &bp->bp_yiaddr);
 822         extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 823
 824         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
 825         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 826         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 827
 828         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 829         NetSendPacket(NetTxPacket, pktlen);
 830 }
 831
 832 /*
 833  *      Handle DHCP received packets.
 834  */
 835 static void
 836 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 837 {
 838         Bootp_t *bp = (Bootp_t *)pkt;
 839
 840         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 841                 src, dest, len, dhcp_state);
 842
 843         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 844                 return;
 845
 846         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 847                 src, dest, len, dhcp_state);
 848
 849         switch (dhcp_state) {
 850         case SELECTING:
 851                 /*
 852                  * Wait an appropriate time for any potential DHCPOFFER packets
 853                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 854                  * If filename is in format we recognize, assume it is a valid
 855                  * OFFER from a server we want.
 856                  */
 857                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 858 #ifdef CFG_BOOTFILE_PREFIX
 859                 if (strncmp(bp->bp_file,
 860                             CFG_BOOTFILE_PREFIX,
 861                             strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
 862 #endif  /* CFG_BOOTFILE_PREFIX */
 863
 864                         debug ("TRANSITIONING TO REQUESTING STATE\n");
 865                         dhcp_state = REQUESTING;
 866
 867                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 868                                 DhcpOptionsProcess(&bp->bp_vend[4]);
 869
 870                         BootpCopyNetParams(bp); /* Store net params from reply */
 871
 872                         NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
 873                         DhcpSendRequestPkt(bp);
 874 #ifdef CFG_BOOTFILE_PREFIX
 875                 }
 876 #endif  /* CFG_BOOTFILE_PREFIX */
 877
 878                 return;
 879                 break;
 880         case REQUESTING:
 881                 debug ("DHCP State: REQUESTING\n");
 882
 883                 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) {
 884                         char *s;
 885
 886                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 887                                 DhcpOptionsProcess(&bp->bp_vend[4]);
 888                         BootpCopyNetParams(bp); /* Store net params from reply */
 889                         dhcp_state = BOUND;
 890                         puts ("DHCP client bound to address ");
 891                         print_IPaddr(NetOurIP);
 892                         putc ('\n');
 893
 894                         /* Obey the 'autoload' setting */
 895                         if ((s = getenv("autoload")) != NULL) {
 896                                 if (*s == 'n') {
 897                                         /*
 898                                          * Just use BOOTP to configure system;
 899                                          * Do not use TFTP to load the bootfile.
 900                                          */
 901                                         NetState = NETLOOP_SUCCESS;
 902                                         return;
 903 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 904                                 } else if (strcmp(s, "NFS") == 0) {
 905                                         /*
 906                                          * Use NFS to load the bootfile.
 907                                          */
 908                                         NfsStart();
 909                                         return;
 910 #endif
 911                                 }
 912                         }
 913                         TftpStart();
 914                         return;
 915                 }
 916                 break;
 917         default:
 918                 puts ("DHCP: INVALID STATE\n");
 919                 break;
 920         }
 921
 922 }
 923
 924 void DhcpRequest(void)
 925 {
 926         BootpRequest();
 927 }
 928 #endif  /* CFG_CMD_DHCP */
 929
 930 #endif /* CFG_CMD_NET */