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