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