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 #if defined(CONFIG_BOOTP_PXE)
 385         char *uuid;
 386         size_t vci_strlen;
 387         u16 clientarch;
 388 #endif
 389
 390 #if defined(CONFIG_BOOTP_VENDOREX)
 391         u8 *x;
 392 #endif
 393 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 394         char *hostname;
 395 #endif
 396
 397         *e++ = 99;              /* RFC1048 Magic Cookie */
 398         *e++ = 130;
 399         *e++ = 83;
 400         *e++ = 99;
 401
 402         *e++ = 53;              /* DHCP Message Type */
 403         *e++ = 1;
 404         *e++ = message_type;
 405
 406         *e++ = 57;              /* Maximum DHCP Message Size */
 407         *e++ = 2;
 408         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 409         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 410
 411         if (ServerID) {
 412                 int tmp = ntohl (ServerID);
 413
 414                 *e++ = 54;      /* ServerID */
 415                 *e++ = 4;
 416                 *e++ = tmp >> 24;
 417                 *e++ = tmp >> 16;
 418                 *e++ = tmp >> 8;
 419                 *e++ = tmp & 0xff;
 420         }
 421
 422         if (RequestedIP) {
 423                 int tmp = ntohl (RequestedIP);
 424
 425                 *e++ = 50;      /* Requested IP */
 426                 *e++ = 4;
 427                 *e++ = tmp >> 24;
 428                 *e++ = tmp >> 16;
 429                 *e++ = tmp >> 8;
 430                 *e++ = tmp & 0xff;
 431         }
 432 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 433         if ((hostname = getenv ("hostname"))) {
 434                 int hostnamelen = strlen (hostname);
 435
 436                 *e++ = 12;      /* Hostname */
 437                 *e++ = hostnamelen;
 438                 memcpy (e, hostname, hostnamelen);
 439                 e += hostnamelen;
 440         }
 441 #endif
 442
 443 #if defined(CONFIG_BOOTP_PXE)
 444         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 445         *e++ = 93;      /* Client System Architecture */
 446         *e++ = 2;
 447         *e++ = (clientarch >> 8) & 0xff;
 448         *e++ = clientarch & 0xff;
 449
 450         *e++ = 94;      /* Client Network Interface Identifier */
 451         *e++ = 3;
 452         *e++ = 1;       /* type field for UNDI */
 453         *e++ = 0;       /* major revision */
 454         *e++ = 0;       /* minor revision */
 455
 456         uuid = getenv("pxeuuid");
 457
 458         if (uuid) {
 459                 if (uuid_str_valid(uuid)) {
 460                         *e++ = 97;      /* Client Machine Identifier */
 461                         *e++ = 17;
 462                         *e++ = 0;       /* type 0 - UUID */
 463
 464                         uuid_str_to_bin(uuid, e);
 465                         e += 16;
 466                 } else {
 467                         printf("Invalid pxeuuid: %s\n", uuid);
 468                 }
 469         }
 470
 471         *e++ = 60;      /* Vendor Class Identifier */
 472         vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING);
 473         *e++ = vci_strlen;
 474         memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen);
 475         e += vci_strlen;
 476 #endif
 477
 478 #if defined(CONFIG_BOOTP_VENDOREX)
 479         if ((x = dhcp_vendorex_prep (e)))
 480                 return x - start;
 481 #endif
 482
 483         *e++ = 55;              /* Parameter Request List */
 484          cnt = e++;             /* Pointer to count of requested items */
 485         *cnt = 0;
 486 #if defined(CONFIG_BOOTP_SUBNETMASK)
 487         *e++  = 1;              /* Subnet Mask */
 488         *cnt += 1;
 489 #endif
 490 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 491         *e++  = 2;
 492         *cnt += 1;
 493 #endif
 494 #if defined(CONFIG_BOOTP_GATEWAY)
 495         *e++  = 3;              /* Router Option */
 496         *cnt += 1;
 497 #endif
 498 #if defined(CONFIG_BOOTP_DNS)
 499         *e++  = 6;              /* DNS Server(s) */
 500         *cnt += 1;
 501 #endif
 502 #if defined(CONFIG_BOOTP_HOSTNAME)
 503         *e++  = 12;             /* Hostname */
 504         *cnt += 1;
 505 #endif
 506 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 507         *e++  = 13;             /* Boot File Size */
 508         *cnt += 1;
 509 #endif
 510 #if defined(CONFIG_BOOTP_BOOTPATH)
 511         *e++  = 17;             /* Boot path */
 512         *cnt += 1;
 513 #endif
 514 #if defined(CONFIG_BOOTP_NISDOMAIN)
 515         *e++  = 40;             /* NIS Domain name request */
 516         *cnt += 1;
 517 #endif
 518 #if defined(CONFIG_BOOTP_NTPSERVER)
 519         *e++  = 42;
 520         *cnt += 1;
 521 #endif
 522         /* no options, so back up to avoid sending an empty request list */
 523         if (*cnt == 0)
 524                 e -= 2;
 525
 526         *e++  = 255;            /* End of the list */
 527
 528         /* Pad to minimal length */
 529 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 530         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 531                 *e++ = 0;
 532 #endif
 533
 534         return e - start;
 535 }
 536
 537 #else
 538 /*
 539  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 540  */
 541 static int BootpExtended (u8 * e)
 542 {
 543         u8 *start = e;
 544
 545         *e++ = 99;              /* RFC1048 Magic Cookie */
 546         *e++ = 130;
 547         *e++ = 83;
 548         *e++ = 99;
 549
 550 #if defined(CONFIG_CMD_DHCP)
 551         *e++ = 53;              /* DHCP Message Type */
 552         *e++ = 1;
 553         *e++ = DHCP_DISCOVER;
 554
 555         *e++ = 57;              /* Maximum DHCP Message Size */
 556         *e++ = 2;
 557         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 558         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 559 #endif
 560
 561 #if defined(CONFIG_BOOTP_SUBNETMASK)
 562         *e++ = 1;               /* Subnet mask request */
 563         *e++ = 4;
 564         e   += 4;
 565 #endif
 566
 567 #if defined(CONFIG_BOOTP_GATEWAY)
 568         *e++ = 3;               /* Default gateway request */
 569         *e++ = 4;
 570         e   += 4;
 571 #endif
 572
 573 #if defined(CONFIG_BOOTP_DNS)
 574         *e++ = 6;               /* Domain Name Server */
 575         *e++ = 4;
 576         e   += 4;
 577 #endif
 578
 579 #if defined(CONFIG_BOOTP_HOSTNAME)
 580         *e++ = 12;              /* Host name request */
 581         *e++ = 32;
 582         e   += 32;
 583 #endif
 584
 585 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 586         *e++ = 13;              /* Boot file size */
 587         *e++ = 2;
 588         e   += 2;
 589 #endif
 590
 591 #if defined(CONFIG_BOOTP_BOOTPATH)
 592         *e++ = 17;              /* Boot path */
 593         *e++ = 32;
 594         e   += 32;
 595 #endif
 596
 597 #if defined(CONFIG_BOOTP_NISDOMAIN)
 598         *e++ = 40;              /* NIS Domain name request */
 599         *e++ = 32;
 600         e   += 32;
 601 #endif
 602 #if defined(CONFIG_BOOTP_NTPSERVER)
 603         *e++ = 42;
 604         *e++ = 4;
 605         e   += 4;
 606 #endif
 607
 608         *e++ = 255;             /* End of the list */
 609
 610         return e - start;
 611 }
 612 #endif
 613
 614 void
 615 BootpRequest (void)
 616 {
 617         volatile uchar *pkt, *iphdr;
 618         Bootp_t *bp;
 619         int ext_len, pktlen, iplen;
 620
 621 #if defined(CONFIG_CMD_DHCP)
 622         dhcp_state = INIT;
 623 #endif
 624
 625 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 626         unsigned char bi_enetaddr[6];
 627         int   reg;
 628         ulong tst1, tst2, sum, m_mask, m_value = 0;
 629
 630         if (BootpTry ==0) {
 631                 /* get our mac */
 632                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 633
 634                 debug("BootpRequest => Our Mac: ");
 635                 for (reg=0; reg<6; reg++)
 636                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 637
 638                 /* Mac-Manipulation 2 get seed1 */
 639                 tst1=0;
 640                 tst2=0;
 641                 for (reg=2; reg<6; reg++) {
 642                         tst1 = tst1 << 8;
 643                         tst1 = tst1 | bi_enetaddr[reg];
 644                 }
 645                 for (reg=0; reg<2; reg++) {
 646                         tst2 = tst2 | bi_enetaddr[reg];
 647                         tst2 = tst2 << 8;
 648                 }
 649
 650                 seed1 = tst1^tst2;
 651
 652                 /* Mirror seed1*/
 653                 m_mask=0x1;
 654                 for (reg=1;reg<=32;reg++) {
 655                         m_value |= (m_mask & seed1);
 656                         seed1 = seed1 >> 1;
 657                         m_value = m_value << 1;
 658                 }
 659                 seed1 = m_value;
 660                 seed2 = 0xB78D0945;
 661         }
 662
 663         /* Random Number Generator */
 664
 665         for (reg=0;reg<=0;reg++) {
 666                 sum = seed1 + seed2;
 667                 if (sum < seed1 || sum < seed2)
 668                         sum++;
 669                 seed2 = seed1;
 670                 seed1 = sum;
 671
 672                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 673                         sum = sum >> (22-BootpTry);
 674                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 675                         sum = sum >> 19;
 676                 }
 677         }
 678
 679         printf ("Random delay: %ld ms...\n", sum);
 680         for (reg=0; reg <sum; reg++) {
 681                 udelay(1000); /*Wait 1ms*/
 682         }
 683 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 684
 685         printf("BOOTP broadcast %d\n", ++BootpTry);
 686         pkt = NetTxPacket;
 687         memset ((void*)pkt, 0, PKTSIZE);
 688
 689         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 690
 691         /*
 692          * Next line results in incorrect packet size being transmitted, resulting
 693          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 694          * set in packet header after extension length has been determined.
 695          * C. Hallinan, DS4.COM, Inc.
 696          */
 697         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 698         iphdr = pkt;    /* We need this later for NetSetIP() */
 699         pkt += IP_HDR_SIZE;
 700
 701         bp = (Bootp_t *)pkt;
 702         bp->bp_op = OP_BOOTREQUEST;
 703         bp->bp_htype = HWT_ETHER;
 704         bp->bp_hlen = HWL_ETHER;
 705         bp->bp_hops = 0;
 706         bp->bp_secs = htons(get_timer(0) / 1000);
 707         NetWriteIP(&bp->bp_ciaddr, 0);
 708         NetWriteIP(&bp->bp_yiaddr, 0);
 709         NetWriteIP(&bp->bp_siaddr, 0);
 710         NetWriteIP(&bp->bp_giaddr, 0);
 711         memcpy (bp->bp_chaddr, NetOurEther, 6);
 712         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 713
 714         /* Request additional information from the BOOTP/DHCP server */
 715 #if defined(CONFIG_CMD_DHCP)
 716         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 717 #else
 718         ext_len = BootpExtended((u8 *)bp->bp_vend);
 719 #endif
 720
 721         /*
 722          *      Bootp ID is the lower 4 bytes of our ethernet address
 723          *      plus the current time in ms.
 724          */
 725         BootpID = ((ulong)NetOurEther[2] << 24)
 726                 | ((ulong)NetOurEther[3] << 16)
 727                 | ((ulong)NetOurEther[4] << 8)
 728                 | (ulong)NetOurEther[5];
 729         BootpID += get_timer(0);
 730         BootpID  = htonl(BootpID);
 731         NetCopyLong(&bp->bp_id, &BootpID);
 732
 733         /*
 734          * Calculate proper packet lengths taking into account the
 735          * variable size of the options field
 736          */
 737         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 738         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 739         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 740         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 741
 742 #if defined(CONFIG_CMD_DHCP)
 743         dhcp_state = SELECTING;
 744         NetSetHandler(DhcpHandler);
 745 #else
 746         NetSetHandler(BootpHandler);
 747 #endif
 748         NetSendPacket(NetTxPacket, pktlen);
 749 }
 750
 751 #if defined(CONFIG_CMD_DHCP)
 752 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 753 {
 754         uchar *end = popt + BOOTP_HDR_SIZE;
 755         int oplen, size;
 756 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 757         int *to_ptr;
 758 #endif
 759
 760         while (popt < end && *popt != 0xff) {
 761                 oplen = *(popt + 1);
 762                 switch (*popt) {
 763                 case 1:
 764                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 765                         break;
 766 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 767                 case 2:         /* Time offset  */
 768                         to_ptr = &NetTimeOffset;
 769                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 770                         NetTimeOffset = ntohl (NetTimeOffset);
 771                         break;
 772 #endif
 773                 case 3:
 774                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 775                         break;
 776                 case 6:
 777                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 778 #if defined(CONFIG_BOOTP_DNS2)
 779                         if (*(popt + 1) > 4) {
 780                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 781                         }
 782 #endif
 783                         break;
 784                 case 12:
 785                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 786                         memcpy (&NetOurHostName, popt + 2, size);
 787                         NetOurHostName[size] = 0;
 788                         break;
 789                 case 15:        /* Ignore Domain Name Option */
 790                         break;
 791                 case 17:
 792                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 793                         memcpy (&NetOurRootPath, popt + 2, size);
 794                         NetOurRootPath[size] = 0;
 795                         break;
 796 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 797                 case 42:        /* NTP server IP */
 798                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 799                         break;
 800 #endif
 801                 case 51:
 802                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 803                         break;
 804                 case 53:        /* Ignore Message Type Option */
 805                         break;
 806                 case 54:
 807                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 808                         break;
 809                 case 58:        /* Ignore Renewal Time Option */
 810                         break;
 811                 case 59:        /* Ignore Rebinding Time Option */
 812                         break;
 813                 case 66:        /* Ignore TFTP server name */
 814                         break;
 815                 case 67:        /* vendor opt bootfile */
 816                         /*
 817                          * I can't use dhcp_vendorex_proc here because I need
 818                          * to write into the bootp packet - even then I had to
 819                          * pass the bootp packet pointer into here as the
 820                          * second arg
 821                          */
 822                         size = truncate_sz ("Opt Boot File",
 823                                             sizeof(bp->bp_file),
 824                                             oplen);
 825                         if (bp->bp_file[0] == '\0' && size > 0) {
 826                                 /*
 827                                  * only use vendor boot file if we didn't
 828                                  * receive a boot file in the main non-vendor
 829                                  * part of the packet - god only knows why
 830                                  * some vendors chose not to use this perfectly
 831                                  * good spot to store the boot file (join on
 832                                  * Tru64 Unix) it seems mind bogglingly crazy
 833                                  * to me
 834                                  */
 835                                 printf("*** WARNING: using vendor "
 836                                         "optional boot file\n");
 837                                 memcpy(bp->bp_file, popt + 2, size);
 838                                 bp->bp_file[size] = '\0';
 839                         }
 840                         break;
 841                 default:
 842 #if defined(CONFIG_BOOTP_VENDOREX)
 843                         if (dhcp_vendorex_proc (popt))
 844                                 break;
 845 #endif
 846                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 847                         break;
 848                 }
 849                 popt += oplen + 2;      /* Process next option */
 850         }
 851 }
 852
 853 static int DhcpMessageType(unsigned char *popt)
 854 {
 855         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 856                 return -1;
 857
 858         popt += 4;
 859         while ( *popt != 0xff ) {
 860                 if ( *popt == 53 )      /* DHCP Message Type */
 861                         return *(popt + 2);
 862                 popt += *(popt + 1) + 2;        /* Scan through all options */
 863         }
 864         return -1;
 865 }
 866
 867 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 868 {
 869         volatile uchar *pkt, *iphdr;
 870         Bootp_t *bp;
 871         int pktlen, iplen, extlen;
 872         IPaddr_t OfferedIP;
 873
 874         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 875         pkt = NetTxPacket;
 876         memset ((void*)pkt, 0, PKTSIZE);
 877
 878         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 879
 880         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 881         pkt += IP_HDR_SIZE;
 882
 883         bp = (Bootp_t *)pkt;
 884         bp->bp_op = OP_BOOTREQUEST;
 885         bp->bp_htype = HWT_ETHER;
 886         bp->bp_hlen = HWL_ETHER;
 887         bp->bp_hops = 0;
 888         bp->bp_secs = htons(get_timer(0) / 1000);
 889         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 890          * the server yet */
 891
 892         /*
 893          * RFC3046 requires Relay Agents to discard packets with
 894          * nonzero and offered giaddr
 895          */
 896         NetWriteIP(&bp->bp_giaddr, 0);
 897
 898         memcpy (bp->bp_chaddr, NetOurEther, 6);
 899
 900         /*
 901          * ID is the id of the OFFER packet
 902          */
 903
 904         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 905
 906         /*
 907          * Copy options from OFFER packet if present
 908          */
 909
 910         /* Copy offered IP into the parameters request list */
 911         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 912         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 913
 914         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 915         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 916         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 917
 918         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 919 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 920         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 921 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 922         NetSendPacket(NetTxPacket, pktlen);
 923 }
 924
 925 /*
 926  *      Handle DHCP received packets.
 927  */
 928 static void
 929 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 930             unsigned len)
 931 {
 932         Bootp_t *bp = (Bootp_t *)pkt;
 933
 934         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 935                 src, dest, len, dhcp_state);
 936
 937         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 938                 return;
 939
 940         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 941                 src, dest, len, dhcp_state);
 942
 943         switch (dhcp_state) {
 944         case SELECTING:
 945                 /*
 946                  * Wait an appropriate time for any potential DHCPOFFER packets
 947                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 948                  * If filename is in format we recognize, assume it is a valid
 949                  * OFFER from a server we want.
 950                  */
 951                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 952 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 953                 if (strncmp(bp->bp_file,
 954                             CONFIG_SYS_BOOTFILE_PREFIX,
 955                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 956 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 957
 958                         debug("TRANSITIONING TO REQUESTING STATE\n");
 959                         dhcp_state = REQUESTING;
 960
 961                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 962                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 963
 964                         NetSetTimeout(TIMEOUT, BootpTimeout);
 965                         DhcpSendRequestPkt(bp);
 966 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 967                 }
 968 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 969
 970                 return;
 971                 break;
 972         case REQUESTING:
 973                 debug("DHCP State: REQUESTING\n");
 974
 975                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 976                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 977                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 978                         BootpCopyNetParams(bp); /* Store net params from reply */
 979                         dhcp_state = BOUND;
 980                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 981
 982                         auto_load();
 983                         return;
 984                 }
 985                 break;
 986         case BOUND:
 987                 /* DHCP client bound to address */
 988                 break;
 989         default:
 990                 puts ("DHCP: INVALID STATE\n");
 991                 break;
 992         }
 993
 994 }
 995
 996 void DhcpRequest(void)
 997 {
 998         BootpRequest();
 999 }
1000 #endif  /* CONFIG_CMD_DHCP */