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 #include <common.h>
  12 #include <command.h>
  13 #include <net.h>
  14 #include "bootp.h"
  15 #include "tftp.h"
  16 #include "nfs.h"
  17 #ifdef CONFIG_STATUS_LED
  18 #include <status_led.h>
  19 #endif
  20
  21 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  22
  23 #define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  24 #ifndef CONFIG_NET_RETRY_COUNT
  25 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  26 #else
  27 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  28 #endif
  29
  30 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  31 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  32
  33 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  34 #define CONFIG_DHCP_MIN_EXT_LEN 64
  35 #endif
  36
  37 ulong           BootpID;
  38 int             BootpTry;
  39 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  40 ulong           seed1, seed2;
  41 #endif
  42
  43 #if defined(CONFIG_CMD_DHCP)
  44 dhcp_state_t dhcp_state = INIT;
  45 unsigned long dhcp_leasetime = 0;
  46 IPaddr_t NetDHCPServerIP = 0;
  47 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  48                         unsigned len);
  49
  50 /* For Debug */
  51 #if 0
  52 static char *dhcpmsg2str(int type)
  53 {
  54         switch (type) {
  55         case 1:  return "DHCPDISCOVER"; break;
  56         case 2:  return "DHCPOFFER";    break;
  57         case 3:  return "DHCPREQUEST";  break;
  58         case 4:  return "DHCPDECLINE";  break;
  59         case 5:  return "DHCPACK";      break;
  60         case 6:  return "DHCPNACK";     break;
  61         case 7:  return "DHCPRELEASE";  break;
  62         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  63         }
  64 }
  65 #endif
  66
  67 #if defined(CONFIG_BOOTP_VENDOREX)
  68 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  69 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  70 #endif
  71
  72 #endif
  73
  74 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  75 {
  76         Bootp_t *bp = (Bootp_t *) pkt;
  77         int retval = 0;
  78
  79         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  80                 retval = -1;
  81         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  82                 retval = -2;
  83         else if (bp->bp_op != OP_BOOTREQUEST &&
  84             bp->bp_op != OP_BOOTREPLY &&
  85             bp->bp_op != DHCP_OFFER &&
  86             bp->bp_op != DHCP_ACK &&
  87             bp->bp_op != DHCP_NAK ) {
  88                 retval = -3;
  89         }
  90         else if (bp->bp_htype != HWT_ETHER)
  91                 retval = -4;
  92         else if (bp->bp_hlen != HWL_ETHER)
  93                 retval = -5;
  94         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
  95                 retval = -6;
  96         }
  97
  98         debug("Filtering pkt = %d\n", retval);
  99
 100         return retval;
 101 }
 102
 103 /*
 104  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 105  */
 106 static void BootpCopyNetParams(Bootp_t *bp)
 107 {
 108         IPaddr_t tmp_ip;
 109
 110         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 111 #if !defined(CONFIG_BOOTP_SERVERIP)
 112         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 113         if (tmp_ip != 0)
 114                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 115         memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6);
 116 #endif
 117         if (strlen(bp->bp_file) > 0)
 118                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 119
 120         debug("Bootfile: %s\n", BootFile);
 121
 122         /* Propagate to environment:
 123          * don't delete exising entry when BOOTP / DHCP reply does
 124          * not contain a new value
 125          */
 126         if (*BootFile) {
 127                 setenv ("bootfile", BootFile);
 128         }
 129 }
 130
 131 static int truncate_sz (const char *name, int maxlen, int curlen)
 132 {
 133         if (curlen >= maxlen) {
 134                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 135                         name, curlen, maxlen);
 136                 curlen = maxlen - 1;
 137         }
 138         return (curlen);
 139 }
 140
 141 /*
 142  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 143  * the boot file.
 144  */
 145 static void auto_load(void)
 146 {
 147         const char *s = getenv("autoload");
 148
 149         if (s != NULL) {
 150                 if (*s == 'n') {
 151                         /*
 152                          * Just use BOOTP to configure system;
 153                          * Do not use TFTP to load the bootfile.
 154                          */
 155                         NetState = NETLOOP_SUCCESS;
 156                         return;
 157                 }
 158 #if defined(CONFIG_CMD_NFS)
 159                 if (strcmp(s, "NFS") == 0) {
 160                         /*
 161                          * Use NFS to load the bootfile.
 162                          */
 163                         NfsStart();
 164                         return;
 165                 }
 166 #endif
 167         }
 168         TftpStart();
 169 }
 170
 171 #if !defined(CONFIG_CMD_DHCP)
 172
 173 static void BootpVendorFieldProcess (u8 * ext)
 174 {
 175         int size = *(ext + 1);
 176
 177         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 178                    *(ext + 1));
 179
 180         NetBootFileSize = 0;
 181
 182         switch (*ext) {
 183                 /* Fixed length fields */
 184         case 1:                 /* Subnet mask                                  */
 185                 if (NetOurSubnetMask == 0)
 186                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 187                 break;
 188         case 2:                 /* Time offset - Not yet supported              */
 189                 break;
 190                 /* Variable length fields */
 191         case 3:                 /* Gateways list                                */
 192                 if (NetOurGatewayIP == 0) {
 193                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 194                 }
 195                 break;
 196         case 4:                 /* Time server - Not yet supported              */
 197                 break;
 198         case 5:                 /* IEN-116 name server - Not yet supported      */
 199                 break;
 200         case 6:
 201                 if (NetOurDNSIP == 0) {
 202                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 203                 }
 204 #if defined(CONFIG_BOOTP_DNS2)
 205                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 206                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 207                 }
 208 #endif
 209                 break;
 210         case 7:                 /* Log server - Not yet supported               */
 211                 break;
 212         case 8:                 /* Cookie/Quote server - Not yet supported      */
 213                 break;
 214         case 9:                 /* LPR server - Not yet supported               */
 215                 break;
 216         case 10:                /* Impress server - Not yet supported           */
 217                 break;
 218         case 11:                /* RPL server - Not yet supported               */
 219                 break;
 220         case 12:                /* Host name                                    */
 221                 if (NetOurHostName[0] == 0) {
 222                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 223                         memcpy (&NetOurHostName, ext + 2, size);
 224                         NetOurHostName[size] = 0;
 225                 }
 226                 break;
 227         case 13:                /* Boot file size                               */
 228                 if (size == 2)
 229                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 230                 else if (size == 4)
 231                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 232                 break;
 233         case 14:                /* Merit dump file - Not yet supported          */
 234                 break;
 235         case 15:                /* Domain name - Not yet supported              */
 236                 break;
 237         case 16:                /* Swap server - Not yet supported              */
 238                 break;
 239         case 17:                /* Root path                                    */
 240                 if (NetOurRootPath[0] == 0) {
 241                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 242                         memcpy (&NetOurRootPath, ext + 2, size);
 243                         NetOurRootPath[size] = 0;
 244                 }
 245                 break;
 246         case 18:                /* Extension path - Not yet supported           */
 247                 /*
 248                  * This can be used to send the information of the
 249                  * vendor area in another file that the client can
 250                  * access via TFTP.
 251                  */
 252                 break;
 253                 /* IP host layer fields */
 254         case 40:                /* NIS Domain name                              */
 255                 if (NetOurNISDomain[0] == 0) {
 256                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 257                         memcpy (&NetOurNISDomain, ext + 2, size);
 258                         NetOurNISDomain[size] = 0;
 259                 }
 260                 break;
 261 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 262         case 42:        /* NTP server IP */
 263                 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2));
 264                 break;
 265 #endif
 266                 /* Application layer fields */
 267         case 43:                /* Vendor specific info - Not yet supported     */
 268                 /*
 269                  * Binary information to exchange specific
 270                  * product information.
 271                  */
 272                 break;
 273                 /* Reserved (custom) fields (128..254) */
 274         }
 275 }
 276
 277 static void BootpVendorProcess (u8 * ext, int size)
 278 {
 279         u8 *end = ext + size;
 280
 281         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 282
 283         while ((ext < end) && (*ext != 0xff)) {
 284                 if (*ext == 0) {
 285                         ext++;
 286                 } else {
 287                         u8 *opt = ext;
 288
 289                         ext += ext[1] + 2;
 290                         if (ext <= end)
 291                                 BootpVendorFieldProcess (opt);
 292                 }
 293         }
 294
 295         debug("[BOOTP] Received fields: \n");
 296         if (NetOurSubnetMask)
 297                 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
 298
 299         if (NetOurGatewayIP)
 300                 debug("NetOurGatewayIP  : %pI4", &NetOurGatewayIP);
 301
 302         if (NetBootFileSize)
 303                 debug("NetBootFileSize : %d\n", NetBootFileSize);
 304
 305         if (NetOurHostName[0])
 306                 debug("NetOurHostName  : %s\n", NetOurHostName);
 307
 308         if (NetOurRootPath[0])
 309                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
 310
 311         if (NetOurNISDomain[0])
 312                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
 313
 314         if (NetBootFileSize)
 315                 debug("NetBootFileSize: %d\n", NetBootFileSize);
 316
 317 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 318         if (NetNtpServerIP)
 319                 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP);
 320 #endif
 321 }
 322
 323 /*
 324  *      Handle a BOOTP received packet.
 325  */
 326 static void
 327 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 328              unsigned len)
 329 {
 330         Bootp_t *bp;
 331
 332         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 333                 src, dest, len, sizeof (Bootp_t));
 334
 335         bp = (Bootp_t *)pkt;
 336
 337         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 338                 return;
 339
 340         /*
 341          *      Got a good BOOTP reply.  Copy the data into our variables.
 342          */
 343 #ifdef CONFIG_STATUS_LED
 344         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 345 #endif
 346
 347         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 348
 349         /* Retrieve extended information (we must parse the vendor area) */
 350         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 351                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 352
 353         NetSetTimeout(0, (thand_f *)0);
 354
 355         debug("Got good BOOTP\n");
 356
 357         auto_load();
 358 }
 359 #endif
 360
 361 /*
 362  *      Timeout on BOOTP/DHCP request.
 363  */
 364 static void
 365 BootpTimeout(void)
 366 {
 367         if (BootpTry >= TIMEOUT_COUNT) {
 368                 puts ("\nRetry count exceeded; starting again\n");
 369                 NetStartAgain ();
 370         } else {
 371                 NetSetTimeout (TIMEOUT, BootpTimeout);
 372                 BootpRequest ();
 373         }
 374 }
 375
 376 /*
 377  *      Initialize BOOTP extension fields in the request.
 378  */
 379 #if defined(CONFIG_CMD_DHCP)
 380 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 381 {
 382         u8 *start = e;
 383         u8 *cnt;
 384
 385 #if defined(CONFIG_BOOTP_VENDOREX)
 386         u8 *x;
 387 #endif
 388 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 389         char *hostname;
 390 #endif
 391
 392         *e++ = 99;              /* RFC1048 Magic Cookie */
 393         *e++ = 130;
 394         *e++ = 83;
 395         *e++ = 99;
 396
 397         *e++ = 53;              /* DHCP Message Type */
 398         *e++ = 1;
 399         *e++ = message_type;
 400
 401         *e++ = 57;              /* Maximum DHCP Message Size */
 402         *e++ = 2;
 403         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 404         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 405
 406         if (ServerID) {
 407                 int tmp = ntohl (ServerID);
 408
 409                 *e++ = 54;      /* ServerID */
 410                 *e++ = 4;
 411                 *e++ = tmp >> 24;
 412                 *e++ = tmp >> 16;
 413                 *e++ = tmp >> 8;
 414                 *e++ = tmp & 0xff;
 415         }
 416
 417         if (RequestedIP) {
 418                 int tmp = ntohl (RequestedIP);
 419
 420                 *e++ = 50;      /* Requested IP */
 421                 *e++ = 4;
 422                 *e++ = tmp >> 24;
 423                 *e++ = tmp >> 16;
 424                 *e++ = tmp >> 8;
 425                 *e++ = tmp & 0xff;
 426         }
 427 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 428         if ((hostname = getenv ("hostname"))) {
 429                 int hostnamelen = strlen (hostname);
 430
 431                 *e++ = 12;      /* Hostname */
 432                 *e++ = hostnamelen;
 433                 memcpy (e, hostname, hostnamelen);
 434                 e += hostnamelen;
 435         }
 436 #endif
 437
 438 #if defined(CONFIG_BOOTP_VENDOREX)
 439         if ((x = dhcp_vendorex_prep (e)))
 440                 return x - start;
 441 #endif
 442
 443         *e++ = 55;              /* Parameter Request List */
 444          cnt = e++;             /* Pointer to count of requested items */
 445         *cnt = 0;
 446 #if defined(CONFIG_BOOTP_SUBNETMASK)
 447         *e++  = 1;              /* Subnet Mask */
 448         *cnt += 1;
 449 #endif
 450 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 451         *e++  = 2;
 452         *cnt += 1;
 453 #endif
 454 #if defined(CONFIG_BOOTP_GATEWAY)
 455         *e++  = 3;              /* Router Option */
 456         *cnt += 1;
 457 #endif
 458 #if defined(CONFIG_BOOTP_DNS)
 459         *e++  = 6;              /* DNS Server(s) */
 460         *cnt += 1;
 461 #endif
 462 #if defined(CONFIG_BOOTP_HOSTNAME)
 463         *e++  = 12;             /* Hostname */
 464         *cnt += 1;
 465 #endif
 466 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 467         *e++  = 13;             /* Boot File Size */
 468         *cnt += 1;
 469 #endif
 470 #if defined(CONFIG_BOOTP_BOOTPATH)
 471         *e++  = 17;             /* Boot path */
 472         *cnt += 1;
 473 #endif
 474 #if defined(CONFIG_BOOTP_NISDOMAIN)
 475         *e++  = 40;             /* NIS Domain name request */
 476         *cnt += 1;
 477 #endif
 478 #if defined(CONFIG_BOOTP_NTPSERVER)
 479         *e++  = 42;
 480         *cnt += 1;
 481 #endif
 482         /* no options, so back up to avoid sending an empty request list */
 483         if (*cnt == 0)
 484                 e -= 2;
 485
 486         *e++  = 255;            /* End of the list */
 487
 488         /* Pad to minimal length */
 489 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 490         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 491                 *e++ = 0;
 492 #endif
 493
 494         return e - start;
 495 }
 496
 497 #else
 498 /*
 499  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 500  */
 501 static int BootpExtended (u8 * e)
 502 {
 503         u8 *start = e;
 504
 505         *e++ = 99;              /* RFC1048 Magic Cookie */
 506         *e++ = 130;
 507         *e++ = 83;
 508         *e++ = 99;
 509
 510 #if defined(CONFIG_CMD_DHCP)
 511         *e++ = 53;              /* DHCP Message Type */
 512         *e++ = 1;
 513         *e++ = DHCP_DISCOVER;
 514
 515         *e++ = 57;              /* Maximum DHCP Message Size */
 516         *e++ = 2;
 517         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 518         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 519 #endif
 520
 521 #if defined(CONFIG_BOOTP_SUBNETMASK)
 522         *e++ = 1;               /* Subnet mask request */
 523         *e++ = 4;
 524         e   += 4;
 525 #endif
 526
 527 #if defined(CONFIG_BOOTP_GATEWAY)
 528         *e++ = 3;               /* Default gateway request */
 529         *e++ = 4;
 530         e   += 4;
 531 #endif
 532
 533 #if defined(CONFIG_BOOTP_DNS)
 534         *e++ = 6;               /* Domain Name Server */
 535         *e++ = 4;
 536         e   += 4;
 537 #endif
 538
 539 #if defined(CONFIG_BOOTP_HOSTNAME)
 540         *e++ = 12;              /* Host name request */
 541         *e++ = 32;
 542         e   += 32;
 543 #endif
 544
 545 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 546         *e++ = 13;              /* Boot file size */
 547         *e++ = 2;
 548         e   += 2;
 549 #endif
 550
 551 #if defined(CONFIG_BOOTP_BOOTPATH)
 552         *e++ = 17;              /* Boot path */
 553         *e++ = 32;
 554         e   += 32;
 555 #endif
 556
 557 #if defined(CONFIG_BOOTP_NISDOMAIN)
 558         *e++ = 40;              /* NIS Domain name request */
 559         *e++ = 32;
 560         e   += 32;
 561 #endif
 562 #if defined(CONFIG_BOOTP_NTPSERVER)
 563         *e++ = 42;
 564         *e++ = 4;
 565         e   += 4;
 566 #endif
 567
 568         *e++ = 255;             /* End of the list */
 569
 570         return e - start;
 571 }
 572 #endif
 573
 574 void
 575 BootpRequest (void)
 576 {
 577         volatile uchar *pkt, *iphdr;
 578         Bootp_t *bp;
 579         int ext_len, pktlen, iplen;
 580
 581 #if defined(CONFIG_CMD_DHCP)
 582         dhcp_state = INIT;
 583 #endif
 584
 585 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 586         unsigned char bi_enetaddr[6];
 587         int   reg;
 588         ulong tst1, tst2, sum, m_mask, m_value = 0;
 589
 590         if (BootpTry ==0) {
 591                 /* get our mac */
 592                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 593
 594                 debug("BootpRequest => Our Mac: ");
 595                 for (reg=0; reg<6; reg++)
 596                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 597
 598                 /* Mac-Manipulation 2 get seed1 */
 599                 tst1=0;
 600                 tst2=0;
 601                 for (reg=2; reg<6; reg++) {
 602                         tst1 = tst1 << 8;
 603                         tst1 = tst1 | bi_enetaddr[reg];
 604                 }
 605                 for (reg=0; reg<2; reg++) {
 606                         tst2 = tst2 | bi_enetaddr[reg];
 607                         tst2 = tst2 << 8;
 608                 }
 609
 610                 seed1 = tst1^tst2;
 611
 612                 /* Mirror seed1*/
 613                 m_mask=0x1;
 614                 for (reg=1;reg<=32;reg++) {
 615                         m_value |= (m_mask & seed1);
 616                         seed1 = seed1 >> 1;
 617                         m_value = m_value << 1;
 618                 }
 619                 seed1 = m_value;
 620                 seed2 = 0xB78D0945;
 621         }
 622
 623         /* Random Number Generator */
 624
 625         for (reg=0;reg<=0;reg++) {
 626                 sum = seed1 + seed2;
 627                 if (sum < seed1 || sum < seed2)
 628                         sum++;
 629                 seed2 = seed1;
 630                 seed1 = sum;
 631
 632                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 633                         sum = sum >> (22-BootpTry);
 634                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 635                         sum = sum >> 19;
 636                 }
 637         }
 638
 639         printf ("Random delay: %ld ms...\n", sum);
 640         for (reg=0; reg <sum; reg++) {
 641                 udelay(1000); /*Wait 1ms*/
 642         }
 643 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 644
 645         printf("BOOTP broadcast %d\n", ++BootpTry);
 646         pkt = NetTxPacket;
 647         memset ((void*)pkt, 0, PKTSIZE);
 648
 649         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 650
 651         /*
 652          * Next line results in incorrect packet size being transmitted, resulting
 653          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 654          * set in packet header after extension length has been determined.
 655          * C. Hallinan, DS4.COM, Inc.
 656          */
 657         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 658         iphdr = pkt;    /* We need this later for NetSetIP() */
 659         pkt += IP_HDR_SIZE;
 660
 661         bp = (Bootp_t *)pkt;
 662         bp->bp_op = OP_BOOTREQUEST;
 663         bp->bp_htype = HWT_ETHER;
 664         bp->bp_hlen = HWL_ETHER;
 665         bp->bp_hops = 0;
 666         bp->bp_secs = htons(get_timer(0) / 1000);
 667         NetWriteIP(&bp->bp_ciaddr, 0);
 668         NetWriteIP(&bp->bp_yiaddr, 0);
 669         NetWriteIP(&bp->bp_siaddr, 0);
 670         NetWriteIP(&bp->bp_giaddr, 0);
 671         memcpy (bp->bp_chaddr, NetOurEther, 6);
 672         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 673
 674         /* Request additional information from the BOOTP/DHCP server */
 675 #if defined(CONFIG_CMD_DHCP)
 676         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 677 #else
 678         ext_len = BootpExtended((u8 *)bp->bp_vend);
 679 #endif
 680
 681         /*
 682          *      Bootp ID is the lower 4 bytes of our ethernet address
 683          *      plus the current time in ms.
 684          */
 685         BootpID = ((ulong)NetOurEther[2] << 24)
 686                 | ((ulong)NetOurEther[3] << 16)
 687                 | ((ulong)NetOurEther[4] << 8)
 688                 | (ulong)NetOurEther[5];
 689         BootpID += get_timer(0);
 690         BootpID  = htonl(BootpID);
 691         NetCopyLong(&bp->bp_id, &BootpID);
 692
 693         /*
 694          * Calculate proper packet lengths taking into account the
 695          * variable size of the options field
 696          */
 697         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 698         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 699         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 700         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 701
 702 #if defined(CONFIG_CMD_DHCP)
 703         dhcp_state = SELECTING;
 704         NetSetHandler(DhcpHandler);
 705 #else
 706         NetSetHandler(BootpHandler);
 707 #endif
 708         NetSendPacket(NetTxPacket, pktlen);
 709 }
 710
 711 #if defined(CONFIG_CMD_DHCP)
 712 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 713 {
 714         uchar *end = popt + BOOTP_HDR_SIZE;
 715         int oplen, size;
 716 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 717         int *to_ptr;
 718 #endif
 719
 720         while (popt < end && *popt != 0xff) {
 721                 oplen = *(popt + 1);
 722                 switch (*popt) {
 723                 case 1:
 724                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 725                         break;
 726 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 727                 case 2:         /* Time offset  */
 728                         to_ptr = &NetTimeOffset;
 729                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 730                         NetTimeOffset = ntohl (NetTimeOffset);
 731                         break;
 732 #endif
 733                 case 3:
 734                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 735                         break;
 736                 case 6:
 737                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 738 #if defined(CONFIG_BOOTP_DNS2)
 739                         if (*(popt + 1) > 4) {
 740                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 741                         }
 742 #endif
 743                         break;
 744                 case 12:
 745                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 746                         memcpy (&NetOurHostName, popt + 2, size);
 747                         NetOurHostName[size] = 0;
 748                         break;
 749                 case 15:        /* Ignore Domain Name Option */
 750                         break;
 751                 case 17:
 752                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 753                         memcpy (&NetOurRootPath, popt + 2, size);
 754                         NetOurRootPath[size] = 0;
 755                         break;
 756 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 757                 case 42:        /* NTP server IP */
 758                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 759                         break;
 760 #endif
 761                 case 51:
 762                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 763                         break;
 764                 case 53:        /* Ignore Message Type Option */
 765                         break;
 766                 case 54:
 767                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 768                         break;
 769                 case 58:        /* Ignore Renewal Time Option */
 770                         break;
 771                 case 59:        /* Ignore Rebinding Time Option */
 772                         break;
 773                 case 66:        /* Ignore TFTP server name */
 774                         break;
 775                 case 67:        /* vendor opt bootfile */
 776                         /*
 777                          * I can't use dhcp_vendorex_proc here because I need
 778                          * to write into the bootp packet - even then I had to
 779                          * pass the bootp packet pointer into here as the
 780                          * second arg
 781                          */
 782                         size = truncate_sz ("Opt Boot File",
 783                                             sizeof(bp->bp_file),
 784                                             oplen);
 785                         if (bp->bp_file[0] == '\0' && size > 0) {
 786                                 /*
 787                                  * only use vendor boot file if we didn't
 788                                  * receive a boot file in the main non-vendor
 789                                  * part of the packet - god only knows why
 790                                  * some vendors chose not to use this perfectly
 791                                  * good spot to store the boot file (join on
 792                                  * Tru64 Unix) it seems mind bogglingly crazy
 793                                  * to me
 794                                  */
 795                                 printf("*** WARNING: using vendor "
 796                                         "optional boot file\n");
 797                                 memcpy(bp->bp_file, popt + 2, size);
 798                                 bp->bp_file[size] = '\0';
 799                         }
 800                         break;
 801                 default:
 802 #if defined(CONFIG_BOOTP_VENDOREX)
 803                         if (dhcp_vendorex_proc (popt))
 804                                 break;
 805 #endif
 806                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 807                         break;
 808                 }
 809                 popt += oplen + 2;      /* Process next option */
 810         }
 811 }
 812
 813 static int DhcpMessageType(unsigned char *popt)
 814 {
 815         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 816                 return -1;
 817
 818         popt += 4;
 819         while ( *popt != 0xff ) {
 820                 if ( *popt == 53 )      /* DHCP Message Type */
 821                         return *(popt + 2);
 822                 popt += *(popt + 1) + 2;        /* Scan through all options */
 823         }
 824         return -1;
 825 }
 826
 827 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 828 {
 829         volatile uchar *pkt, *iphdr;
 830         Bootp_t *bp;
 831         int pktlen, iplen, extlen;
 832         IPaddr_t OfferedIP;
 833
 834         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 835         pkt = NetTxPacket;
 836         memset ((void*)pkt, 0, PKTSIZE);
 837
 838         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 839
 840         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 841         pkt += IP_HDR_SIZE;
 842
 843         bp = (Bootp_t *)pkt;
 844         bp->bp_op = OP_BOOTREQUEST;
 845         bp->bp_htype = HWT_ETHER;
 846         bp->bp_hlen = HWL_ETHER;
 847         bp->bp_hops = 0;
 848         bp->bp_secs = htons(get_timer(0) / 1000);
 849         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 850          * the server yet */
 851
 852         /*
 853          * RFC3046 requires Relay Agents to discard packets with
 854          * nonzero and offered giaddr
 855          */
 856         NetWriteIP(&bp->bp_giaddr, 0);
 857
 858         memcpy (bp->bp_chaddr, NetOurEther, 6);
 859
 860         /*
 861          * ID is the id of the OFFER packet
 862          */
 863
 864         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 865
 866         /*
 867          * Copy options from OFFER packet if present
 868          */
 869
 870         /* Copy offered IP into the parameters request list */
 871         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 872         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 873
 874         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_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 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 880         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 881 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 882         NetSendPacket(NetTxPacket, pktlen);
 883 }
 884
 885 /*
 886  *      Handle DHCP received packets.
 887  */
 888 static void
 889 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 890             unsigned len)
 891 {
 892         Bootp_t *bp = (Bootp_t *)pkt;
 893
 894         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 895                 src, dest, len, dhcp_state);
 896
 897         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 898                 return;
 899
 900         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 901                 src, dest, len, dhcp_state);
 902
 903         switch (dhcp_state) {
 904         case SELECTING:
 905                 /*
 906                  * Wait an appropriate time for any potential DHCPOFFER packets
 907                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 908                  * If filename is in format we recognize, assume it is a valid
 909                  * OFFER from a server we want.
 910                  */
 911                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 912 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 913                 if (strncmp(bp->bp_file,
 914                             CONFIG_SYS_BOOTFILE_PREFIX,
 915                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 916 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 917
 918                         debug("TRANSITIONING TO REQUESTING STATE\n");
 919                         dhcp_state = REQUESTING;
 920
 921                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 922                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 923
 924                         NetSetTimeout(TIMEOUT, BootpTimeout);
 925                         DhcpSendRequestPkt(bp);
 926 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 927                 }
 928 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 929
 930                 return;
 931                 break;
 932         case REQUESTING:
 933                 debug("DHCP State: REQUESTING\n");
 934
 935                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 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                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 941
 942                         auto_load();
 943                         return;
 944                 }
 945                 break;
 946         case BOUND:
 947                 /* DHCP client bound to address */
 948                 break;
 949         default:
 950                 puts ("DHCP: INVALID STATE\n");
 951                 break;
 952         }
 953
 954 }
 955
 956 void DhcpRequest(void)
 957 {
 958         BootpRequest();
 959 }
 960 #endif  /* CONFIG_CMD_DHCP */