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((uchar *)&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         char *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_TIMEOFFSET)
 452         *e++  = 2;
 453         *cnt += 1;
 454 #endif
 455 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 456         *e++  = 3;              /* Router Option */
 457         *cnt += 1;
 458 #endif
 459 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 460         *e++  = 6;              /* DNS Server(s) */
 461         *cnt += 1;
 462 #endif
 463 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 464         *e++  = 12;             /* Hostname */
 465         *cnt += 1;
 466 #endif
 467 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 468         *e++  = 13;             /* Boot File Size */
 469         *cnt += 1;
 470 #endif
 471 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 472         *e++  = 17;             /* Boot path */
 473         *cnt += 1;
 474 #endif
 475 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 476         *e++  = 40;             /* NIS Domain name request */
 477         *cnt += 1;
 478 #endif
 479 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NTPSERVER)
 480         *e++  = 42;
 481         *cnt += 1;
 482 #endif
 483         *e++  = 255;            /* End of the list */
 484
 485         /* Pad to minimal length */
 486 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 487         while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
 488                 *e++ = 0;
 489 #endif
 490
 491         return e - start;
 492 }
 493
 494 #else   /* CFG_CMD_DHCP */
 495 /*
 496  *      Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
 497  */
 498 static int BootpExtended (u8 * e)
 499 {
 500         u8 *start = e;
 501
 502         *e++ = 99;              /* RFC1048 Magic Cookie */
 503         *e++ = 130;
 504         *e++ = 83;
 505         *e++ = 99;
 506
 507 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 508         *e++ = 53;              /* DHCP Message Type */
 509         *e++ = 1;
 510         *e++ = DHCP_DISCOVER;
 511
 512         *e++ = 57;              /* Maximum DHCP Message Size */
 513         *e++ = 2;
 514         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 515         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 516 #endif /* CFG_CMD_DHCP */
 517
 518 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 519         *e++ = 1;               /* Subnet mask request */
 520         *e++ = 4;
 521         e   += 4;
 522 #endif
 523
 524 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 525         *e++ = 3;               /* Default gateway request */
 526         *e++ = 4;
 527         e   += 4;
 528 #endif
 529
 530 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 531         *e++ = 6;               /* Domain Name Server */
 532         *e++ = 4;
 533         e   += 4;
 534 #endif
 535
 536 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 537         *e++ = 12;              /* Host name request */
 538         *e++ = 32;
 539         e   += 32;
 540 #endif
 541
 542 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 543         *e++ = 13;              /* Boot file size */
 544         *e++ = 2;
 545         e   += 2;
 546 #endif
 547
 548 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 549         *e++ = 17;              /* Boot path */
 550         *e++ = 32;
 551         e   += 32;
 552 #endif
 553
 554 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 555         *e++ = 40;              /* NIS Domain name request */
 556         *e++ = 32;
 557         e   += 32;
 558 #endif
 559
 560         *e++ = 255;             /* End of the list */
 561
 562         return e - start;
 563 }
 564 #endif  /* CFG_CMD_DHCP */
 565
 566 void
 567 BootpRequest (void)
 568 {
 569         volatile uchar *pkt, *iphdr;
 570         Bootp_t *bp;
 571         int ext_len, pktlen, iplen;
 572
 573 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 574         dhcp_state = INIT;
 575 #endif
 576
 577 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 578         unsigned char bi_enetaddr[6];
 579         int   reg;
 580         char  *e,*s;
 581         char tmp[64];
 582         ulong tst1, tst2, sum, m_mask, m_value = 0;
 583
 584         if (BootpTry ==0) {
 585                 /* get our mac */
 586                 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
 587                 s = (reg > 0) ? tmp : NULL;
 588
 589                 for (reg=0; reg<6; ++reg) {
 590                         bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
 591                         if (s) {
 592                                 s = (*e) ? e+1 : e;
 593                         }
 594                 }
 595 #ifdef DEBUG
 596                 puts ("BootpRequest => Our Mac: ");
 597                 for (reg=0; reg<6; reg++) {
 598                         printf ("%x%c",
 599                                 bi_enetaddr[reg],
 600                                 reg==5 ? '\n' : ':');
 601                 }
 602 #endif /* DEBUG */
 603
 604                 /* Mac-Manipulation 2 get seed1 */
 605                 tst1=0;
 606                 tst2=0;
 607                 for (reg=2; reg<6; reg++) {
 608                         tst1 = tst1 << 8;
 609                         tst1 = tst1 | bi_enetaddr[reg];
 610                 }
 611                 for (reg=0; reg<2; reg++) {
 612                         tst2 = tst2 | bi_enetaddr[reg];
 613                         tst2 = tst2 << 8;
 614                 }
 615
 616                 seed1 = tst1^tst2;
 617
 618                 /* Mirror seed1*/
 619                 m_mask=0x1;
 620                 for (reg=1;reg<=32;reg++) {
 621                         m_value |= (m_mask & seed1);
 622                         seed1 = seed1 >> 1;
 623                         m_value = m_value << 1;
 624                 }
 625                 seed1 = m_value;
 626                 seed2 = 0xB78D0945;
 627         }
 628
 629         /* Random Number Generator */
 630
 631         for (reg=0;reg<=0;reg++) {
 632                 sum = seed1 + seed2;
 633                 if (sum < seed1 || sum < seed2)
 634                         sum++;
 635                 seed2 = seed1;
 636                 seed1 = sum;
 637
 638                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 639                         sum = sum >> (22-BootpTry);
 640                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 641                         sum = sum >> 19;
 642                 }
 643         }
 644
 645         printf ("Random delay: %ld ms...\n", sum);
 646         for (reg=0; reg <sum; reg++) {
 647                 udelay(1000); /*Wait 1ms*/
 648         }
 649 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 650
 651         printf("BOOTP broadcast %d\n", ++BootpTry);
 652         pkt = NetTxPacket;
 653         memset ((void*)pkt, 0, PKTSIZE);
 654
 655         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 656
 657         /*
 658          * Next line results in incorrect packet size being transmitted, resulting
 659          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 660          * set in packet header after extension length has been determined.
 661          * C. Hallinan, DS4.COM, Inc.
 662          */
 663         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 664         iphdr = pkt;    /* We need this later for NetSetIP() */
 665         pkt += IP_HDR_SIZE;
 666
 667         bp = (Bootp_t *)pkt;
 668         bp->bp_op = OP_BOOTREQUEST;
 669         bp->bp_htype = HWT_ETHER;
 670         bp->bp_hlen = HWL_ETHER;
 671         bp->bp_hops = 0;
 672         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 673         NetWriteIP(&bp->bp_ciaddr, 0);
 674         NetWriteIP(&bp->bp_yiaddr, 0);
 675         NetWriteIP(&bp->bp_siaddr, 0);
 676         NetWriteIP(&bp->bp_giaddr, 0);
 677         memcpy (bp->bp_chaddr, NetOurEther, 6);
 678         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 679
 680         /* Request additional information from the BOOTP/DHCP server */
 681 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 682         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 683 #else
 684         ext_len = BootpExtended((u8 *)bp->bp_vend);
 685 #endif  /* CFG_CMD_DHCP */
 686
 687         /*
 688          *      Bootp ID is the lower 4 bytes of our ethernet address
 689          *      plus the current time in HZ.
 690          */
 691         BootpID = ((ulong)NetOurEther[2] << 24)
 692                 | ((ulong)NetOurEther[3] << 16)
 693                 | ((ulong)NetOurEther[4] << 8)
 694                 | (ulong)NetOurEther[5];
 695         BootpID += get_timer(0);
 696         BootpID  = htonl(BootpID);
 697         NetCopyLong(&bp->bp_id, &BootpID);
 698
 699         /*
 700          * Calculate proper packet lengths taking into account the
 701          * variable size of the options field
 702          */
 703         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
 704         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 705         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 706         NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
 707
 708 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 709         dhcp_state = SELECTING;
 710         NetSetHandler(DhcpHandler);
 711 #else
 712         NetSetHandler(BootpHandler);
 713 #endif  /* CFG_CMD_DHCP */
 714         NetSendPacket(NetTxPacket, pktlen);
 715 }
 716
 717 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 718 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 719 {
 720         uchar *end = popt + BOOTP_HDR_SIZE;
 721         int oplen, size;
 722
 723         while (popt < end && *popt != 0xff) {
 724                 oplen = *(popt + 1);
 725                 switch (*popt) {
 726                 case 1:
 727                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 728                         break;
 729 #if (CONFIG_COMMANDS & CFG_CMD_SNTP) && (CONFIG_BOOTP_MASK & CONFIG_BOOTP_TIMEOFFSET)
 730                 case 2:         /* Time offset  */
 731                         NetCopyLong (&NetTimeOffset, (ulong *) (popt + 2));
 732                         NetTimeOffset = ntohl (NetTimeOffset);
 733                         break;
 734 #endif
 735                 case 3:
 736                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 737                         break;
 738                 case 6:
 739                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 740 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS2)
 741                         if (*(popt + 1) > 4) {
 742                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 743                         }
 744 #endif
 745                         break;
 746                 case 12:
 747                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 748                         memcpy (&NetOurHostName, popt + 2, size);
 749                         NetOurHostName[size] = 0;
 750                         break;
 751                 case 15:        /* Ignore Domain Name Option */
 752                         break;
 753                 case 17:
 754                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 755                         memcpy (&NetOurRootPath, popt + 2, size);
 756                         NetOurRootPath[size] = 0;
 757                         break;
 758 #if (CONFIG_COMMANDS & CFG_CMD_SNTP) && (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NTPSERVER)
 759                 case 42:        /* NTP server IP */
 760                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 761                         break;
 762 #endif
 763                 case 51:
 764                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 765                         break;
 766                 case 53:        /* Ignore Message Type Option */
 767                         break;
 768                 case 54:
 769                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 770                         break;
 771                 case 58:        /* Ignore Renewal Time Option */
 772                         break;
 773                 case 59:        /* Ignore Rebinding Time Option */
 774                         break;
 775                 case 66:        /* Ignore TFTP server name */
 776                         break;
 777                 case 67:        /* vendor opt bootfile */
 778                         /*
 779                          * I can't use dhcp_vendorex_proc here because I need
 780                          * to write into the bootp packet - even then I had to
 781                          * pass the bootp packet pointer into here as the
 782                          * second arg
 783                          */
 784                         size = truncate_sz ("Opt Boot File",
 785                                             sizeof(bp->bp_file),
 786                                             oplen);
 787                         if (bp->bp_file[0] == '\0' && size > 0) {
 788                                 /*
 789                                  * only use vendor boot file if we didn't
 790                                  * receive a boot file in the main non-vendor
 791                                  * part of the packet - god only knows why
 792                                  * some vendors chose not to use this perfectly
 793                                  * good spot to store the boot file (join on
 794                                  * Tru64 Unix) it seems mind bogglingly crazy
 795                                  * to me
 796                                  */
 797                                 printf("*** WARNING: using vendor "
 798                                         "optional boot file\n");
 799                                 memcpy(bp->bp_file, popt + 2, size);
 800                                 bp->bp_file[size] = '\0';
 801                         }
 802                         break;
 803                 default:
 804 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 805                         if (dhcp_vendorex_proc (popt))
 806                                 break;
 807 #endif
 808                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 809                         break;
 810                 }
 811                 popt += oplen + 2;      /* Process next option */
 812         }
 813 }
 814
 815 static int DhcpMessageType(unsigned char *popt)
 816 {
 817         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 818                 return -1;
 819
 820         popt += 4;
 821         while ( *popt != 0xff ) {
 822                 if ( *popt == 53 )      /* DHCP Message Type */
 823                         return *(popt + 2);
 824                 popt += *(popt + 1) + 2;        /* Scan through all options */
 825         }
 826         return -1;
 827 }
 828
 829 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 830 {
 831         volatile uchar *pkt, *iphdr;
 832         Bootp_t *bp;
 833         int pktlen, iplen, extlen;
 834         IPaddr_t OfferedIP;
 835
 836         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 837         pkt = NetTxPacket;
 838         memset ((void*)pkt, 0, PKTSIZE);
 839
 840         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 841
 842         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 843         pkt += IP_HDR_SIZE;
 844
 845         bp = (Bootp_t *)pkt;
 846         bp->bp_op = OP_BOOTREQUEST;
 847         bp->bp_htype = HWT_ETHER;
 848         bp->bp_hlen = HWL_ETHER;
 849         bp->bp_hops = 0;
 850         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 851         NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
 852         NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
 853         NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
 854         /*
 855          * RFC3046 requires Relay Agents to discard packets with
 856          * nonzero and offered giaddr
 857          */
 858         NetWriteIP(&bp->bp_giaddr, 0);
 859
 860         memcpy (bp->bp_chaddr, NetOurEther, 6);
 861
 862         /*
 863          * ID is the id of the OFFER packet
 864          */
 865
 866         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 867
 868         /*
 869          * Copy options from OFFER packet if present
 870          */
 871         NetCopyIP(&OfferedIP, &bp->bp_yiaddr);
 872         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 873
 874         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
 875         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 876         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 877
 878         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 879         NetSendPacket(NetTxPacket, pktlen);
 880 }
 881
 882 /*
 883  *      Handle DHCP received packets.
 884  */
 885 static void
 886 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 887 {
 888         Bootp_t *bp = (Bootp_t *)pkt;
 889
 890         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 891                 src, dest, len, dhcp_state);
 892
 893         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 894                 return;
 895
 896         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 897                 src, dest, len, dhcp_state);
 898
 899         switch (dhcp_state) {
 900         case SELECTING:
 901                 /*
 902                  * Wait an appropriate time for any potential DHCPOFFER packets
 903                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 904                  * If filename is in format we recognize, assume it is a valid
 905                  * OFFER from a server we want.
 906                  */
 907                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 908 #ifdef CFG_BOOTFILE_PREFIX
 909                 if (strncmp(bp->bp_file,
 910                             CFG_BOOTFILE_PREFIX,
 911                             strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
 912 #endif  /* CFG_BOOTFILE_PREFIX */
 913
 914                         debug ("TRANSITIONING TO REQUESTING STATE\n");
 915                         dhcp_state = REQUESTING;
 916
 917                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 918                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 919
 920                         BootpCopyNetParams(bp); /* Store net params from reply */
 921
 922                         NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
 923                         DhcpSendRequestPkt(bp);
 924 #ifdef CFG_BOOTFILE_PREFIX
 925                 }
 926 #endif  /* CFG_BOOTFILE_PREFIX */
 927
 928                 return;
 929                 break;
 930         case REQUESTING:
 931                 debug ("DHCP State: REQUESTING\n");
 932
 933                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 934                         char *s;
 935
 936                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 937                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 938                         BootpCopyNetParams(bp); /* Store net params from reply */
 939                         dhcp_state = BOUND;
 940                         puts ("DHCP client bound to address ");
 941                         print_IPaddr(NetOurIP);
 942                         putc ('\n');
 943
 944                         /* Obey the 'autoload' setting */
 945                         if ((s = getenv("autoload")) != NULL) {
 946                                 if (*s == 'n') {
 947                                         /*
 948                                          * Just use BOOTP to configure system;
 949                                          * Do not use TFTP to load the bootfile.
 950                                          */
 951                                         NetState = NETLOOP_SUCCESS;
 952                                         return;
 953 #if (CONFIG_COMMANDS & CFG_CMD_NFS)
 954                                 } else if (strcmp(s, "NFS") == 0) {
 955                                         /*
 956                                          * Use NFS to load the bootfile.
 957                                          */
 958                                         NfsStart();
 959                                         return;
 960 #endif
 961                                 }
 962                         }
 963                         TftpStart();
 964                         return;
 965                 }
 966                 break;
 967         default:
 968                 puts ("DHCP: INVALID STATE\n");
 969                 break;
 970         }
 971
 972 }
 973
 974 void DhcpRequest(void)
 975 {
 976         BootpRequest();
 977 }
 978 #endif  /* CFG_CMD_DHCP */
 979
 980 #endif /* CFG_CMD_NET */