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 #include <linux/compiler.h>
  21
  22 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  23
  24 #define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  25 #ifndef CONFIG_NET_RETRY_COUNT
  26 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  27 #else
  28 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  29 #endif
  30
  31 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  32 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  33
  34 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  35 #define CONFIG_DHCP_MIN_EXT_LEN 64
  36 #endif
  37
  38 ulong           BootpID;
  39 int             BootpTry;
  40 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  41 ulong           seed1, seed2;
  42 #endif
  43
  44 #if defined(CONFIG_CMD_DHCP)
  45 dhcp_state_t dhcp_state = INIT;
  46 unsigned long dhcp_leasetime = 0;
  47 IPaddr_t NetDHCPServerIP = 0;
  48 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  49                         unsigned len);
  50
  51 /* For Debug */
  52 #if 0
  53 static char *dhcpmsg2str(int type)
  54 {
  55         switch (type) {
  56         case 1:  return "DHCPDISCOVER"; break;
  57         case 2:  return "DHCPOFFER";    break;
  58         case 3:  return "DHCPREQUEST";  break;
  59         case 4:  return "DHCPDECLINE";  break;
  60         case 5:  return "DHCPACK";      break;
  61         case 6:  return "DHCPNACK";     break;
  62         case 7:  return "DHCPRELEASE";  break;
  63         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  64         }
  65 }
  66 #endif
  67
  68 #if defined(CONFIG_BOOTP_VENDOREX)
  69 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  70 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  71 #endif
  72
  73 #endif
  74
  75 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  76 {
  77         Bootp_t *bp = (Bootp_t *) pkt;
  78         int retval = 0;
  79
  80         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  81                 retval = -1;
  82         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  83                 retval = -2;
  84         else if (bp->bp_op != OP_BOOTREQUEST &&
  85             bp->bp_op != OP_BOOTREPLY &&
  86             bp->bp_op != DHCP_OFFER &&
  87             bp->bp_op != DHCP_ACK &&
  88             bp->bp_op != DHCP_NAK ) {
  89                 retval = -3;
  90         }
  91         else if (bp->bp_htype != HWT_ETHER)
  92                 retval = -4;
  93         else if (bp->bp_hlen != HWL_ETHER)
  94                 retval = -5;
  95         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
  96                 retval = -6;
  97         }
  98
  99         debug("Filtering pkt = %d\n", retval);
 100
 101         return retval;
 102 }
 103
 104 /*
 105  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 106  */
 107 static void BootpCopyNetParams(Bootp_t *bp)
 108 {
 109         __maybe_unused IPaddr_t tmp_ip;
 110
 111         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 112 #if !defined(CONFIG_BOOTP_SERVERIP)
 113         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 114         if (tmp_ip != 0)
 115                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 116         memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6);
 117 #endif
 118         if (strlen(bp->bp_file) > 0)
 119                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 120
 121         debug("Bootfile: %s\n", BootFile);
 122
 123         /* Propagate to environment:
 124          * don't delete exising entry when BOOTP / DHCP reply does
 125          * not contain a new value
 126          */
 127         if (*BootFile) {
 128                 setenv ("bootfile", BootFile);
 129         }
 130 }
 131
 132 static int truncate_sz (const char *name, int maxlen, int curlen)
 133 {
 134         if (curlen >= maxlen) {
 135                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 136                         name, curlen, maxlen);
 137                 curlen = maxlen - 1;
 138         }
 139         return (curlen);
 140 }
 141
 142 #if !defined(CONFIG_CMD_DHCP)
 143
 144 static void BootpVendorFieldProcess (u8 * ext)
 145 {
 146         int size = *(ext + 1);
 147
 148         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 149                    *(ext + 1));
 150
 151         NetBootFileSize = 0;
 152
 153         switch (*ext) {
 154                 /* Fixed length fields */
 155         case 1:                 /* Subnet mask                                  */
 156                 if (NetOurSubnetMask == 0)
 157                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 158                 break;
 159         case 2:                 /* Time offset - Not yet supported              */
 160                 break;
 161                 /* Variable length fields */
 162         case 3:                 /* Gateways list                                */
 163                 if (NetOurGatewayIP == 0) {
 164                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 165                 }
 166                 break;
 167         case 4:                 /* Time server - Not yet supported              */
 168                 break;
 169         case 5:                 /* IEN-116 name server - Not yet supported      */
 170                 break;
 171         case 6:
 172                 if (NetOurDNSIP == 0) {
 173                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 174                 }
 175 #if defined(CONFIG_BOOTP_DNS2)
 176                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 177                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 178                 }
 179 #endif
 180                 break;
 181         case 7:                 /* Log server - Not yet supported               */
 182                 break;
 183         case 8:                 /* Cookie/Quote server - Not yet supported      */
 184                 break;
 185         case 9:                 /* LPR server - Not yet supported               */
 186                 break;
 187         case 10:                /* Impress server - Not yet supported           */
 188                 break;
 189         case 11:                /* RPL server - Not yet supported               */
 190                 break;
 191         case 12:                /* Host name                                    */
 192                 if (NetOurHostName[0] == 0) {
 193                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 194                         memcpy (&NetOurHostName, ext + 2, size);
 195                         NetOurHostName[size] = 0;
 196                 }
 197                 break;
 198         case 13:                /* Boot file size                               */
 199                 if (size == 2)
 200                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 201                 else if (size == 4)
 202                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 203                 break;
 204         case 14:                /* Merit dump file - Not yet supported          */
 205                 break;
 206         case 15:                /* Domain name - Not yet supported              */
 207                 break;
 208         case 16:                /* Swap server - Not yet supported              */
 209                 break;
 210         case 17:                /* Root path                                    */
 211                 if (NetOurRootPath[0] == 0) {
 212                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 213                         memcpy (&NetOurRootPath, ext + 2, size);
 214                         NetOurRootPath[size] = 0;
 215                 }
 216                 break;
 217         case 18:                /* Extension path - Not yet supported           */
 218                 /*
 219                  * This can be used to send the information of the
 220                  * vendor area in another file that the client can
 221                  * access via TFTP.
 222                  */
 223                 break;
 224                 /* IP host layer fields */
 225         case 40:                /* NIS Domain name                              */
 226                 if (NetOurNISDomain[0] == 0) {
 227                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 228                         memcpy (&NetOurNISDomain, ext + 2, size);
 229                         NetOurNISDomain[size] = 0;
 230                 }
 231                 break;
 232 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 233         case 42:        /* NTP server IP */
 234                 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2));
 235                 break;
 236 #endif
 237                 /* Application layer fields */
 238         case 43:                /* Vendor specific info - Not yet supported     */
 239                 /*
 240                  * Binary information to exchange specific
 241                  * product information.
 242                  */
 243                 break;
 244                 /* Reserved (custom) fields (128..254) */
 245         }
 246 }
 247
 248 static void BootpVendorProcess (u8 * ext, int size)
 249 {
 250         u8 *end = ext + size;
 251
 252         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 253
 254         while ((ext < end) && (*ext != 0xff)) {
 255                 if (*ext == 0) {
 256                         ext++;
 257                 } else {
 258                         u8 *opt = ext;
 259
 260                         ext += ext[1] + 2;
 261                         if (ext <= end)
 262                                 BootpVendorFieldProcess (opt);
 263                 }
 264         }
 265
 266         debug("[BOOTP] Received fields: \n");
 267         if (NetOurSubnetMask)
 268                 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
 269
 270         if (NetOurGatewayIP)
 271                 debug("NetOurGatewayIP  : %pI4", &NetOurGatewayIP);
 272
 273         if (NetBootFileSize)
 274                 debug("NetBootFileSize : %d\n", NetBootFileSize);
 275
 276         if (NetOurHostName[0])
 277                 debug("NetOurHostName  : %s\n", NetOurHostName);
 278
 279         if (NetOurRootPath[0])
 280                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
 281
 282         if (NetOurNISDomain[0])
 283                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
 284
 285         if (NetBootFileSize)
 286                 debug("NetBootFileSize: %d\n", NetBootFileSize);
 287
 288 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 289         if (NetNtpServerIP)
 290                 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP);
 291 #endif
 292 }
 293
 294 /*
 295  *      Handle a BOOTP received packet.
 296  */
 297 static void
 298 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 299              unsigned len)
 300 {
 301         Bootp_t *bp;
 302
 303         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 304                 src, dest, len, sizeof (Bootp_t));
 305
 306         bp = (Bootp_t *)pkt;
 307
 308         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 309                 return;
 310
 311         /*
 312          *      Got a good BOOTP reply.  Copy the data into our variables.
 313          */
 314 #ifdef CONFIG_STATUS_LED
 315         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 316 #endif
 317
 318         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 319
 320         /* Retrieve extended information (we must parse the vendor area) */
 321         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 322                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 323
 324         NetSetTimeout(0, (thand_f *)0);
 325
 326         debug("Got good BOOTP\n");
 327
 328         net_auto_load();
 329 }
 330 #endif
 331
 332 /*
 333  *      Timeout on BOOTP/DHCP request.
 334  */
 335 static void
 336 BootpTimeout(void)
 337 {
 338         if (BootpTry >= TIMEOUT_COUNT) {
 339                 puts ("\nRetry count exceeded; starting again\n");
 340                 NetStartAgain ();
 341         } else {
 342                 NetSetTimeout (TIMEOUT, BootpTimeout);
 343                 BootpRequest ();
 344         }
 345 }
 346
 347 /*
 348  *      Initialize BOOTP extension fields in the request.
 349  */
 350 #if defined(CONFIG_CMD_DHCP)
 351 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 352 {
 353         u8 *start = e;
 354         u8 *cnt;
 355 #if defined(CONFIG_BOOTP_PXE)
 356         char *uuid;
 357         size_t vci_strlen;
 358         u16 clientarch;
 359 #endif
 360
 361 #if defined(CONFIG_BOOTP_VENDOREX)
 362         u8 *x;
 363 #endif
 364 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 365         char *hostname;
 366 #endif
 367
 368         *e++ = 99;              /* RFC1048 Magic Cookie */
 369         *e++ = 130;
 370         *e++ = 83;
 371         *e++ = 99;
 372
 373         *e++ = 53;              /* DHCP Message Type */
 374         *e++ = 1;
 375         *e++ = message_type;
 376
 377         *e++ = 57;              /* Maximum DHCP Message Size */
 378         *e++ = 2;
 379         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 380         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 381
 382         if (ServerID) {
 383                 int tmp = ntohl (ServerID);
 384
 385                 *e++ = 54;      /* ServerID */
 386                 *e++ = 4;
 387                 *e++ = tmp >> 24;
 388                 *e++ = tmp >> 16;
 389                 *e++ = tmp >> 8;
 390                 *e++ = tmp & 0xff;
 391         }
 392
 393         if (RequestedIP) {
 394                 int tmp = ntohl (RequestedIP);
 395
 396                 *e++ = 50;      /* Requested IP */
 397                 *e++ = 4;
 398                 *e++ = tmp >> 24;
 399                 *e++ = tmp >> 16;
 400                 *e++ = tmp >> 8;
 401                 *e++ = tmp & 0xff;
 402         }
 403 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 404         if ((hostname = getenv ("hostname"))) {
 405                 int hostnamelen = strlen (hostname);
 406
 407                 *e++ = 12;      /* Hostname */
 408                 *e++ = hostnamelen;
 409                 memcpy (e, hostname, hostnamelen);
 410                 e += hostnamelen;
 411         }
 412 #endif
 413
 414 #if defined(CONFIG_BOOTP_PXE)
 415         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 416         *e++ = 93;      /* Client System Architecture */
 417         *e++ = 2;
 418         *e++ = (clientarch >> 8) & 0xff;
 419         *e++ = clientarch & 0xff;
 420
 421         *e++ = 94;      /* Client Network Interface Identifier */
 422         *e++ = 3;
 423         *e++ = 1;       /* type field for UNDI */
 424         *e++ = 0;       /* major revision */
 425         *e++ = 0;       /* minor revision */
 426
 427         uuid = getenv("pxeuuid");
 428
 429         if (uuid) {
 430                 if (uuid_str_valid(uuid)) {
 431                         *e++ = 97;      /* Client Machine Identifier */
 432                         *e++ = 17;
 433                         *e++ = 0;       /* type 0 - UUID */
 434
 435                         uuid_str_to_bin(uuid, e);
 436                         e += 16;
 437                 } else {
 438                         printf("Invalid pxeuuid: %s\n", uuid);
 439                 }
 440         }
 441
 442         *e++ = 60;      /* Vendor Class Identifier */
 443         vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING);
 444         *e++ = vci_strlen;
 445         memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen);
 446         e += vci_strlen;
 447 #endif
 448
 449 #if defined(CONFIG_BOOTP_VENDOREX)
 450         if ((x = dhcp_vendorex_prep (e)))
 451                 return x - start;
 452 #endif
 453
 454         *e++ = 55;              /* Parameter Request List */
 455          cnt = e++;             /* Pointer to count of requested items */
 456         *cnt = 0;
 457 #if defined(CONFIG_BOOTP_SUBNETMASK)
 458         *e++  = 1;              /* Subnet Mask */
 459         *cnt += 1;
 460 #endif
 461 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 462         *e++  = 2;
 463         *cnt += 1;
 464 #endif
 465 #if defined(CONFIG_BOOTP_GATEWAY)
 466         *e++  = 3;              /* Router Option */
 467         *cnt += 1;
 468 #endif
 469 #if defined(CONFIG_BOOTP_DNS)
 470         *e++  = 6;              /* DNS Server(s) */
 471         *cnt += 1;
 472 #endif
 473 #if defined(CONFIG_BOOTP_HOSTNAME)
 474         *e++  = 12;             /* Hostname */
 475         *cnt += 1;
 476 #endif
 477 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 478         *e++  = 13;             /* Boot File Size */
 479         *cnt += 1;
 480 #endif
 481 #if defined(CONFIG_BOOTP_BOOTPATH)
 482         *e++  = 17;             /* Boot path */
 483         *cnt += 1;
 484 #endif
 485 #if defined(CONFIG_BOOTP_NISDOMAIN)
 486         *e++  = 40;             /* NIS Domain name request */
 487         *cnt += 1;
 488 #endif
 489 #if defined(CONFIG_BOOTP_NTPSERVER)
 490         *e++  = 42;
 491         *cnt += 1;
 492 #endif
 493         /* no options, so back up to avoid sending an empty request list */
 494         if (*cnt == 0)
 495                 e -= 2;
 496
 497         *e++  = 255;            /* End of the list */
 498
 499         /* Pad to minimal length */
 500 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 501         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 502                 *e++ = 0;
 503 #endif
 504
 505         return e - start;
 506 }
 507
 508 #else
 509 /*
 510  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 511  */
 512 static int BootpExtended (u8 * e)
 513 {
 514         u8 *start = e;
 515
 516         *e++ = 99;              /* RFC1048 Magic Cookie */
 517         *e++ = 130;
 518         *e++ = 83;
 519         *e++ = 99;
 520
 521 #if defined(CONFIG_CMD_DHCP)
 522         *e++ = 53;              /* DHCP Message Type */
 523         *e++ = 1;
 524         *e++ = DHCP_DISCOVER;
 525
 526         *e++ = 57;              /* Maximum DHCP Message Size */
 527         *e++ = 2;
 528         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 529         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 530 #endif
 531
 532 #if defined(CONFIG_BOOTP_SUBNETMASK)
 533         *e++ = 1;               /* Subnet mask request */
 534         *e++ = 4;
 535         e   += 4;
 536 #endif
 537
 538 #if defined(CONFIG_BOOTP_GATEWAY)
 539         *e++ = 3;               /* Default gateway request */
 540         *e++ = 4;
 541         e   += 4;
 542 #endif
 543
 544 #if defined(CONFIG_BOOTP_DNS)
 545         *e++ = 6;               /* Domain Name Server */
 546         *e++ = 4;
 547         e   += 4;
 548 #endif
 549
 550 #if defined(CONFIG_BOOTP_HOSTNAME)
 551         *e++ = 12;              /* Host name request */
 552         *e++ = 32;
 553         e   += 32;
 554 #endif
 555
 556 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 557         *e++ = 13;              /* Boot file size */
 558         *e++ = 2;
 559         e   += 2;
 560 #endif
 561
 562 #if defined(CONFIG_BOOTP_BOOTPATH)
 563         *e++ = 17;              /* Boot path */
 564         *e++ = 32;
 565         e   += 32;
 566 #endif
 567
 568 #if defined(CONFIG_BOOTP_NISDOMAIN)
 569         *e++ = 40;              /* NIS Domain name request */
 570         *e++ = 32;
 571         e   += 32;
 572 #endif
 573 #if defined(CONFIG_BOOTP_NTPSERVER)
 574         *e++ = 42;
 575         *e++ = 4;
 576         e   += 4;
 577 #endif
 578
 579         *e++ = 255;             /* End of the list */
 580
 581         return e - start;
 582 }
 583 #endif
 584
 585 void
 586 BootpRequest (void)
 587 {
 588         volatile uchar *pkt, *iphdr;
 589         Bootp_t *bp;
 590         int ext_len, pktlen, iplen;
 591
 592 #if defined(CONFIG_CMD_DHCP)
 593         dhcp_state = INIT;
 594 #endif
 595
 596 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 597         unsigned char bi_enetaddr[6];
 598         int   reg;
 599         ulong tst1, tst2, sum, m_mask, m_value = 0;
 600
 601         if (BootpTry ==0) {
 602                 /* get our mac */
 603                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 604
 605                 debug("BootpRequest => Our Mac: ");
 606                 for (reg=0; reg<6; reg++)
 607                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 608
 609                 /* Mac-Manipulation 2 get seed1 */
 610                 tst1=0;
 611                 tst2=0;
 612                 for (reg=2; reg<6; reg++) {
 613                         tst1 = tst1 << 8;
 614                         tst1 = tst1 | bi_enetaddr[reg];
 615                 }
 616                 for (reg=0; reg<2; reg++) {
 617                         tst2 = tst2 | bi_enetaddr[reg];
 618                         tst2 = tst2 << 8;
 619                 }
 620
 621                 seed1 = tst1^tst2;
 622
 623                 /* Mirror seed1*/
 624                 m_mask=0x1;
 625                 for (reg=1;reg<=32;reg++) {
 626                         m_value |= (m_mask & seed1);
 627                         seed1 = seed1 >> 1;
 628                         m_value = m_value << 1;
 629                 }
 630                 seed1 = m_value;
 631                 seed2 = 0xB78D0945;
 632         }
 633
 634         /* Random Number Generator */
 635
 636         for (reg=0;reg<=0;reg++) {
 637                 sum = seed1 + seed2;
 638                 if (sum < seed1 || sum < seed2)
 639                         sum++;
 640                 seed2 = seed1;
 641                 seed1 = sum;
 642
 643                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 644                         sum = sum >> (22-BootpTry);
 645                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 646                         sum = sum >> 19;
 647                 }
 648         }
 649
 650         printf ("Random delay: %ld ms...\n", sum);
 651         for (reg=0; reg <sum; reg++) {
 652                 udelay(1000); /*Wait 1ms*/
 653         }
 654 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 655
 656         printf("BOOTP broadcast %d\n", ++BootpTry);
 657         pkt = NetTxPacket;
 658         memset ((void*)pkt, 0, PKTSIZE);
 659
 660         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 661
 662         /*
 663          * Next line results in incorrect packet size being transmitted, resulting
 664          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 665          * set in packet header after extension length has been determined.
 666          * C. Hallinan, DS4.COM, Inc.
 667          */
 668         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 669         iphdr = pkt;    /* We need this later for NetSetIP() */
 670         pkt += IP_HDR_SIZE;
 671
 672         bp = (Bootp_t *)pkt;
 673         bp->bp_op = OP_BOOTREQUEST;
 674         bp->bp_htype = HWT_ETHER;
 675         bp->bp_hlen = HWL_ETHER;
 676         bp->bp_hops = 0;
 677         bp->bp_secs = htons(get_timer(0) / 1000);
 678         NetWriteIP(&bp->bp_ciaddr, 0);
 679         NetWriteIP(&bp->bp_yiaddr, 0);
 680         NetWriteIP(&bp->bp_siaddr, 0);
 681         NetWriteIP(&bp->bp_giaddr, 0);
 682         memcpy (bp->bp_chaddr, NetOurEther, 6);
 683         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 684
 685         /* Request additional information from the BOOTP/DHCP server */
 686 #if defined(CONFIG_CMD_DHCP)
 687         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 688 #else
 689         ext_len = BootpExtended((u8 *)bp->bp_vend);
 690 #endif
 691
 692         /*
 693          *      Bootp ID is the lower 4 bytes of our ethernet address
 694          *      plus the current time in ms.
 695          */
 696         BootpID = ((ulong)NetOurEther[2] << 24)
 697                 | ((ulong)NetOurEther[3] << 16)
 698                 | ((ulong)NetOurEther[4] << 8)
 699                 | (ulong)NetOurEther[5];
 700         BootpID += get_timer(0);
 701         BootpID  = htonl(BootpID);
 702         NetCopyLong(&bp->bp_id, &BootpID);
 703
 704         /*
 705          * Calculate proper packet lengths taking into account the
 706          * variable size of the options field
 707          */
 708         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 709         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 710         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 711         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 712
 713 #if defined(CONFIG_CMD_DHCP)
 714         dhcp_state = SELECTING;
 715         NetSetHandler(DhcpHandler);
 716 #else
 717         NetSetHandler(BootpHandler);
 718 #endif
 719         NetSendPacket(NetTxPacket, pktlen);
 720 }
 721
 722 #if defined(CONFIG_CMD_DHCP)
 723 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 724 {
 725         uchar *end = popt + BOOTP_HDR_SIZE;
 726         int oplen, size;
 727 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 728         int *to_ptr;
 729 #endif
 730
 731         while (popt < end && *popt != 0xff) {
 732                 oplen = *(popt + 1);
 733                 switch (*popt) {
 734                 case 1:
 735                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 736                         break;
 737 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 738                 case 2:         /* Time offset  */
 739                         to_ptr = &NetTimeOffset;
 740                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 741                         NetTimeOffset = ntohl (NetTimeOffset);
 742                         break;
 743 #endif
 744                 case 3:
 745                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 746                         break;
 747                 case 6:
 748                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 749 #if defined(CONFIG_BOOTP_DNS2)
 750                         if (*(popt + 1) > 4) {
 751                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 752                         }
 753 #endif
 754                         break;
 755                 case 12:
 756                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 757                         memcpy (&NetOurHostName, popt + 2, size);
 758                         NetOurHostName[size] = 0;
 759                         break;
 760                 case 15:        /* Ignore Domain Name Option */
 761                         break;
 762                 case 17:
 763                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 764                         memcpy (&NetOurRootPath, popt + 2, size);
 765                         NetOurRootPath[size] = 0;
 766                         break;
 767 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 768                 case 42:        /* NTP server IP */
 769                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 770                         break;
 771 #endif
 772                 case 51:
 773                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 774                         break;
 775                 case 53:        /* Ignore Message Type Option */
 776                         break;
 777                 case 54:
 778                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 779                         break;
 780                 case 58:        /* Ignore Renewal Time Option */
 781                         break;
 782                 case 59:        /* Ignore Rebinding Time Option */
 783                         break;
 784                 case 66:        /* Ignore TFTP server name */
 785                         break;
 786                 case 67:        /* vendor opt bootfile */
 787                         /*
 788                          * I can't use dhcp_vendorex_proc here because I need
 789                          * to write into the bootp packet - even then I had to
 790                          * pass the bootp packet pointer into here as the
 791                          * second arg
 792                          */
 793                         size = truncate_sz ("Opt Boot File",
 794                                             sizeof(bp->bp_file),
 795                                             oplen);
 796                         if (bp->bp_file[0] == '\0' && size > 0) {
 797                                 /*
 798                                  * only use vendor boot file if we didn't
 799                                  * receive a boot file in the main non-vendor
 800                                  * part of the packet - god only knows why
 801                                  * some vendors chose not to use this perfectly
 802                                  * good spot to store the boot file (join on
 803                                  * Tru64 Unix) it seems mind bogglingly crazy
 804                                  * to me
 805                                  */
 806                                 printf("*** WARNING: using vendor "
 807                                         "optional boot file\n");
 808                                 memcpy(bp->bp_file, popt + 2, size);
 809                                 bp->bp_file[size] = '\0';
 810                         }
 811                         break;
 812                 default:
 813 #if defined(CONFIG_BOOTP_VENDOREX)
 814                         if (dhcp_vendorex_proc (popt))
 815                                 break;
 816 #endif
 817                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 818                         break;
 819                 }
 820                 popt += oplen + 2;      /* Process next option */
 821         }
 822 }
 823
 824 static int DhcpMessageType(unsigned char *popt)
 825 {
 826         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 827                 return -1;
 828
 829         popt += 4;
 830         while ( *popt != 0xff ) {
 831                 if ( *popt == 53 )      /* DHCP Message Type */
 832                         return *(popt + 2);
 833                 popt += *(popt + 1) + 2;        /* Scan through all options */
 834         }
 835         return -1;
 836 }
 837
 838 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 839 {
 840         volatile uchar *pkt, *iphdr;
 841         Bootp_t *bp;
 842         int pktlen, iplen, extlen;
 843         IPaddr_t OfferedIP;
 844
 845         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 846         pkt = NetTxPacket;
 847         memset ((void*)pkt, 0, PKTSIZE);
 848
 849         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 850
 851         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 852         pkt += IP_HDR_SIZE;
 853
 854         bp = (Bootp_t *)pkt;
 855         bp->bp_op = OP_BOOTREQUEST;
 856         bp->bp_htype = HWT_ETHER;
 857         bp->bp_hlen = HWL_ETHER;
 858         bp->bp_hops = 0;
 859         bp->bp_secs = htons(get_timer(0) / 1000);
 860         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 861          * the server yet */
 862
 863         /*
 864          * RFC3046 requires Relay Agents to discard packets with
 865          * nonzero and offered giaddr
 866          */
 867         NetWriteIP(&bp->bp_giaddr, 0);
 868
 869         memcpy (bp->bp_chaddr, NetOurEther, 6);
 870
 871         /*
 872          * ID is the id of the OFFER packet
 873          */
 874
 875         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 876
 877         /*
 878          * Copy options from OFFER packet if present
 879          */
 880
 881         /* Copy offered IP into the parameters request list */
 882         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 883         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 884
 885         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 886         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 887         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 888
 889         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 890 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 891         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 892 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 893         NetSendPacket(NetTxPacket, pktlen);
 894 }
 895
 896 /*
 897  *      Handle DHCP received packets.
 898  */
 899 static void
 900 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 901             unsigned len)
 902 {
 903         Bootp_t *bp = (Bootp_t *)pkt;
 904
 905         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 906                 src, dest, len, dhcp_state);
 907
 908         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 909                 return;
 910
 911         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 912                 src, dest, len, dhcp_state);
 913
 914         switch (dhcp_state) {
 915         case SELECTING:
 916                 /*
 917                  * Wait an appropriate time for any potential DHCPOFFER packets
 918                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 919                  * If filename is in format we recognize, assume it is a valid
 920                  * OFFER from a server we want.
 921                  */
 922                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 923 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 924                 if (strncmp(bp->bp_file,
 925                             CONFIG_SYS_BOOTFILE_PREFIX,
 926                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 927 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 928
 929                         debug("TRANSITIONING TO REQUESTING STATE\n");
 930                         dhcp_state = REQUESTING;
 931
 932                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 933                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 934
 935                         NetSetTimeout(TIMEOUT, BootpTimeout);
 936                         DhcpSendRequestPkt(bp);
 937 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 938                 }
 939 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 940
 941                 return;
 942                 break;
 943         case REQUESTING:
 944                 debug("DHCP State: REQUESTING\n");
 945
 946                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 947                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 948                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 949                         BootpCopyNetParams(bp); /* Store net params from reply */
 950                         dhcp_state = BOUND;
 951                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 952
 953                         net_auto_load();
 954                         return;
 955                 }
 956                 break;
 957         case BOUND:
 958                 /* DHCP client bound to address */
 959                 break;
 960         default:
 961                 puts ("DHCP: INVALID STATE\n");
 962                 break;
 963         }
 964
 965 }
 966
 967 void DhcpRequest(void)
 968 {
 969         BootpRequest();
 970 }
 971 #endif  /* CONFIG_CMD_DHCP */