net/bootp.c

   1 /*
   2  *      Based on LiMon - BOOTP.
   3  *
   4  *      Copyright 1994, 1995, 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2004 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <net.h>
  14 #include "bootp.h"
  15 #include "tftp.h"
  16 #include "nfs.h"
  17 #ifdef CONFIG_STATUS_LED
  18 #include <status_led.h>
  19 #endif
  20
  21 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  22
  23 #define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  24 #ifndef CONFIG_NET_RETRY_COUNT
  25 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  26 #else
  27 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  28 #endif
  29
  30 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  31 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  32
  33 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  34 #define CONFIG_DHCP_MIN_EXT_LEN 64
  35 #endif
  36
  37 ulong           BootpID;
  38 int             BootpTry;
  39 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  40 ulong           seed1, seed2;
  41 #endif
  42
  43 #if defined(CONFIG_CMD_DHCP)
  44 dhcp_state_t dhcp_state = INIT;
  45 unsigned long dhcp_leasetime = 0;
  46 IPaddr_t NetDHCPServerIP = 0;
  47 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  48                         unsigned len);
  49
  50 /* For Debug */
  51 #if 0
  52 static char *dhcpmsg2str(int type)
  53 {
  54         switch (type) {
  55         case 1:  return "DHCPDISCOVER"; break;
  56         case 2:  return "DHCPOFFER";    break;
  57         case 3:  return "DHCPREQUEST";  break;
  58         case 4:  return "DHCPDECLINE";  break;
  59         case 5:  return "DHCPACK";      break;
  60         case 6:  return "DHCPNACK";     break;
  61         case 7:  return "DHCPRELEASE";  break;
  62         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  63         }
  64 }
  65 #endif
  66
  67 #if defined(CONFIG_BOOTP_VENDOREX)
  68 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  69 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  70 #endif
  71
  72 #endif
  73
  74 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  75 {
  76         Bootp_t *bp = (Bootp_t *) pkt;
  77         int retval = 0;
  78
  79         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  80                 retval = -1;
  81         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  82                 retval = -2;
  83         else if (bp->bp_op != OP_BOOTREQUEST &&
  84             bp->bp_op != OP_BOOTREPLY &&
  85             bp->bp_op != DHCP_OFFER &&
  86             bp->bp_op != DHCP_ACK &&
  87             bp->bp_op != DHCP_NAK ) {
  88                 retval = -3;
  89         }
  90         else if (bp->bp_htype != HWT_ETHER)
  91                 retval = -4;
  92         else if (bp->bp_hlen != HWL_ETHER)
  93                 retval = -5;
  94         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
  95                 retval = -6;
  96         }
  97
  98         debug("Filtering pkt = %d\n", retval);
  99
 100         return retval;
 101 }
 102
 103 /*
 104  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 105  */
 106 static void BootpCopyNetParams(Bootp_t *bp)
 107 {
 108         IPaddr_t tmp_ip;
 109
 110         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 111 #if !defined(CONFIG_BOOTP_SERVERIP)
 112         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 113         if (tmp_ip != 0)
 114                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 115         memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6);
 116 #endif
 117         if (strlen(bp->bp_file) > 0)
 118                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 119
 120         debug("Bootfile: %s\n", BootFile);
 121
 122         /* Propagate to environment:
 123          * don't delete exising entry when BOOTP / DHCP reply does
 124          * not contain a new value
 125          */
 126         if (*BootFile) {
 127                 setenv ("bootfile", BootFile);
 128         }
 129 }
 130
 131 static int truncate_sz (const char *name, int maxlen, int curlen)
 132 {
 133         if (curlen >= maxlen) {
 134                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 135                         name, curlen, maxlen);
 136                 curlen = maxlen - 1;
 137         }
 138         return (curlen);
 139 }
 140
 141 #if !defined(CONFIG_CMD_DHCP)
 142
 143 static void BootpVendorFieldProcess (u8 * ext)
 144 {
 145         int size = *(ext + 1);
 146
 147         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 148                    *(ext + 1));
 149
 150         NetBootFileSize = 0;
 151
 152         switch (*ext) {
 153                 /* Fixed length fields */
 154         case 1:                 /* Subnet mask                                  */
 155                 if (NetOurSubnetMask == 0)
 156                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 157                 break;
 158         case 2:                 /* Time offset - Not yet supported              */
 159                 break;
 160                 /* Variable length fields */
 161         case 3:                 /* Gateways list                                */
 162                 if (NetOurGatewayIP == 0) {
 163                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 164                 }
 165                 break;
 166         case 4:                 /* Time server - Not yet supported              */
 167                 break;
 168         case 5:                 /* IEN-116 name server - Not yet supported      */
 169                 break;
 170         case 6:
 171                 if (NetOurDNSIP == 0) {
 172                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 173                 }
 174 #if defined(CONFIG_BOOTP_DNS2)
 175                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 176                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 177                 }
 178 #endif
 179                 break;
 180         case 7:                 /* Log server - Not yet supported               */
 181                 break;
 182         case 8:                 /* Cookie/Quote server - Not yet supported      */
 183                 break;
 184         case 9:                 /* LPR server - Not yet supported               */
 185                 break;
 186         case 10:                /* Impress server - Not yet supported           */
 187                 break;
 188         case 11:                /* RPL server - Not yet supported               */
 189                 break;
 190         case 12:                /* Host name                                    */
 191                 if (NetOurHostName[0] == 0) {
 192                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 193                         memcpy (&NetOurHostName, ext + 2, size);
 194                         NetOurHostName[size] = 0;
 195                 }
 196                 break;
 197         case 13:                /* Boot file size                               */
 198                 if (size == 2)
 199                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 200                 else if (size == 4)
 201                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 202                 break;
 203         case 14:                /* Merit dump file - Not yet supported          */
 204                 break;
 205         case 15:                /* Domain name - Not yet supported              */
 206                 break;
 207         case 16:                /* Swap server - Not yet supported              */
 208                 break;
 209         case 17:                /* Root path                                    */
 210                 if (NetOurRootPath[0] == 0) {
 211                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 212                         memcpy (&NetOurRootPath, ext + 2, size);
 213                         NetOurRootPath[size] = 0;
 214                 }
 215                 break;
 216         case 18:                /* Extension path - Not yet supported           */
 217                 /*
 218                  * This can be used to send the information of the
 219                  * vendor area in another file that the client can
 220                  * access via TFTP.
 221                  */
 222                 break;
 223                 /* IP host layer fields */
 224         case 40:                /* NIS Domain name                              */
 225                 if (NetOurNISDomain[0] == 0) {
 226                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 227                         memcpy (&NetOurNISDomain, ext + 2, size);
 228                         NetOurNISDomain[size] = 0;
 229                 }
 230                 break;
 231                 /* Application layer fields */
 232         case 43:                /* Vendor specific info - Not yet supported     */
 233                 /*
 234                  * Binary information to exchange specific
 235                  * product information.
 236                  */
 237                 break;
 238                 /* Reserved (custom) fields (128..254) */
 239         }
 240 }
 241
 242 static void BootpVendorProcess (u8 * ext, int size)
 243 {
 244         u8 *end = ext + size;
 245
 246         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 247
 248         while ((ext < end) && (*ext != 0xff)) {
 249                 if (*ext == 0) {
 250                         ext++;
 251                 } else {
 252                         u8 *opt = ext;
 253
 254                         ext += ext[1] + 2;
 255                         if (ext <= end)
 256                                 BootpVendorFieldProcess (opt);
 257                 }
 258         }
 259
 260         debug("[BOOTP] Received fields: \n");
 261         if (NetOurSubnetMask)
 262                 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
 263
 264         if (NetOurGatewayIP)
 265                 debug("NetOurGatewayIP  : %pI4", &NetOurGatewayIP);
 266
 267         if (NetBootFileSize)
 268                 debug("NetBootFileSize : %d\n", NetBootFileSize);
 269
 270         if (NetOurHostName[0])
 271                 debug("NetOurHostName  : %s\n", NetOurHostName);
 272
 273         if (NetOurRootPath[0])
 274                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
 275
 276         if (NetOurNISDomain[0])
 277                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
 278
 279         if (NetBootFileSize)
 280                 debug("NetBootFileSize: %d\n", NetBootFileSize);
 281 }
 282 /*
 283  *      Handle a BOOTP received packet.
 284  */
 285 static void
 286 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 287              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         /* no options, so back up to avoid sending an empty request list */
 462         if (*cnt == 0)
 463                 e -= 2;
 464
 465         *e++  = 255;            /* End of the list */
 466
 467         /* Pad to minimal length */
 468 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 469         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 470                 *e++ = 0;
 471 #endif
 472
 473         return e - start;
 474 }
 475
 476 #else
 477 /*
 478  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 479  */
 480 static int BootpExtended (u8 * e)
 481 {
 482         u8 *start = e;
 483
 484         *e++ = 99;              /* RFC1048 Magic Cookie */
 485         *e++ = 130;
 486         *e++ = 83;
 487         *e++ = 99;
 488
 489 #if defined(CONFIG_CMD_DHCP)
 490         *e++ = 53;              /* DHCP Message Type */
 491         *e++ = 1;
 492         *e++ = DHCP_DISCOVER;
 493
 494         *e++ = 57;              /* Maximum DHCP Message Size */
 495         *e++ = 2;
 496         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 497         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 498 #endif
 499
 500 #if defined(CONFIG_BOOTP_SUBNETMASK)
 501         *e++ = 1;               /* Subnet mask request */
 502         *e++ = 4;
 503         e   += 4;
 504 #endif
 505
 506 #if defined(CONFIG_BOOTP_GATEWAY)
 507         *e++ = 3;               /* Default gateway request */
 508         *e++ = 4;
 509         e   += 4;
 510 #endif
 511
 512 #if defined(CONFIG_BOOTP_DNS)
 513         *e++ = 6;               /* Domain Name Server */
 514         *e++ = 4;
 515         e   += 4;
 516 #endif
 517
 518 #if defined(CONFIG_BOOTP_HOSTNAME)
 519         *e++ = 12;              /* Host name request */
 520         *e++ = 32;
 521         e   += 32;
 522 #endif
 523
 524 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 525         *e++ = 13;              /* Boot file size */
 526         *e++ = 2;
 527         e   += 2;
 528 #endif
 529
 530 #if defined(CONFIG_BOOTP_BOOTPATH)
 531         *e++ = 17;              /* Boot path */
 532         *e++ = 32;
 533         e   += 32;
 534 #endif
 535
 536 #if defined(CONFIG_BOOTP_NISDOMAIN)
 537         *e++ = 40;              /* NIS Domain name request */
 538         *e++ = 32;
 539         e   += 32;
 540 #endif
 541
 542         *e++ = 255;             /* End of the list */
 543
 544         return e - start;
 545 }
 546 #endif
 547
 548 void
 549 BootpRequest (void)
 550 {
 551         volatile uchar *pkt, *iphdr;
 552         Bootp_t *bp;
 553         int ext_len, pktlen, iplen;
 554
 555 #if defined(CONFIG_CMD_DHCP)
 556         dhcp_state = INIT;
 557 #endif
 558
 559 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 560         unsigned char bi_enetaddr[6];
 561         int   reg;
 562         ulong tst1, tst2, sum, m_mask, m_value = 0;
 563
 564         if (BootpTry ==0) {
 565                 /* get our mac */
 566                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 567
 568                 debug("BootpRequest => Our Mac: ");
 569                 for (reg=0; reg<6; reg++)
 570                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 571
 572                 /* Mac-Manipulation 2 get seed1 */
 573                 tst1=0;
 574                 tst2=0;
 575                 for (reg=2; reg<6; reg++) {
 576                         tst1 = tst1 << 8;
 577                         tst1 = tst1 | bi_enetaddr[reg];
 578                 }
 579                 for (reg=0; reg<2; reg++) {
 580                         tst2 = tst2 | bi_enetaddr[reg];
 581                         tst2 = tst2 << 8;
 582                 }
 583
 584                 seed1 = tst1^tst2;
 585
 586                 /* Mirror seed1*/
 587                 m_mask=0x1;
 588                 for (reg=1;reg<=32;reg++) {
 589                         m_value |= (m_mask & seed1);
 590                         seed1 = seed1 >> 1;
 591                         m_value = m_value << 1;
 592                 }
 593                 seed1 = m_value;
 594                 seed2 = 0xB78D0945;
 595         }
 596
 597         /* Random Number Generator */
 598
 599         for (reg=0;reg<=0;reg++) {
 600                 sum = seed1 + seed2;
 601                 if (sum < seed1 || sum < seed2)
 602                         sum++;
 603                 seed2 = seed1;
 604                 seed1 = sum;
 605
 606                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 607                         sum = sum >> (22-BootpTry);
 608                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 609                         sum = sum >> 19;
 610                 }
 611         }
 612
 613         printf ("Random delay: %ld ms...\n", sum);
 614         for (reg=0; reg <sum; reg++) {
 615                 udelay(1000); /*Wait 1ms*/
 616         }
 617 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 618
 619         printf("BOOTP broadcast %d\n", ++BootpTry);
 620         pkt = NetTxPacket;
 621         memset ((void*)pkt, 0, PKTSIZE);
 622
 623         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 624
 625         /*
 626          * Next line results in incorrect packet size being transmitted, resulting
 627          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 628          * set in packet header after extension length has been determined.
 629          * C. Hallinan, DS4.COM, Inc.
 630          */
 631         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 632         iphdr = pkt;    /* We need this later for NetSetIP() */
 633         pkt += IP_HDR_SIZE;
 634
 635         bp = (Bootp_t *)pkt;
 636         bp->bp_op = OP_BOOTREQUEST;
 637         bp->bp_htype = HWT_ETHER;
 638         bp->bp_hlen = HWL_ETHER;
 639         bp->bp_hops = 0;
 640         bp->bp_secs = htons(get_timer(0) / 1000);
 641         NetWriteIP(&bp->bp_ciaddr, 0);
 642         NetWriteIP(&bp->bp_yiaddr, 0);
 643         NetWriteIP(&bp->bp_siaddr, 0);
 644         NetWriteIP(&bp->bp_giaddr, 0);
 645         memcpy (bp->bp_chaddr, NetOurEther, 6);
 646         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 647
 648         /* Request additional information from the BOOTP/DHCP server */
 649 #if defined(CONFIG_CMD_DHCP)
 650         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 651 #else
 652         ext_len = BootpExtended((u8 *)bp->bp_vend);
 653 #endif
 654
 655         /*
 656          *      Bootp ID is the lower 4 bytes of our ethernet address
 657          *      plus the current time in ms.
 658          */
 659         BootpID = ((ulong)NetOurEther[2] << 24)
 660                 | ((ulong)NetOurEther[3] << 16)
 661                 | ((ulong)NetOurEther[4] << 8)
 662                 | (ulong)NetOurEther[5];
 663         BootpID += get_timer(0);
 664         BootpID  = htonl(BootpID);
 665         NetCopyLong(&bp->bp_id, &BootpID);
 666
 667         /*
 668          * Calculate proper packet lengths taking into account the
 669          * variable size of the options field
 670          */
 671         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 672         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 673         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 674         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 675
 676 #if defined(CONFIG_CMD_DHCP)
 677         dhcp_state = SELECTING;
 678         NetSetHandler(DhcpHandler);
 679 #else
 680         NetSetHandler(BootpHandler);
 681 #endif
 682         NetSendPacket(NetTxPacket, pktlen);
 683 }
 684
 685 #if defined(CONFIG_CMD_DHCP)
 686 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 687 {
 688         uchar *end = popt + BOOTP_HDR_SIZE;
 689         int oplen, size;
 690 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 691         int *to_ptr;
 692 #endif
 693
 694         while (popt < end && *popt != 0xff) {
 695                 oplen = *(popt + 1);
 696                 switch (*popt) {
 697                 case 1:
 698                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 699                         break;
 700 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 701                 case 2:         /* Time offset  */
 702                         to_ptr = &NetTimeOffset;
 703                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 704                         NetTimeOffset = ntohl (NetTimeOffset);
 705                         break;
 706 #endif
 707                 case 3:
 708                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 709                         break;
 710                 case 6:
 711                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 712 #if defined(CONFIG_BOOTP_DNS2)
 713                         if (*(popt + 1) > 4) {
 714                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 715                         }
 716 #endif
 717                         break;
 718                 case 12:
 719                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 720                         memcpy (&NetOurHostName, popt + 2, size);
 721                         NetOurHostName[size] = 0;
 722                         break;
 723                 case 15:        /* Ignore Domain Name Option */
 724                         break;
 725                 case 17:
 726                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 727                         memcpy (&NetOurRootPath, popt + 2, size);
 728                         NetOurRootPath[size] = 0;
 729                         break;
 730 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 731                 case 42:        /* NTP server IP */
 732                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 733                         break;
 734 #endif
 735                 case 51:
 736                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 737                         break;
 738                 case 53:        /* Ignore Message Type Option */
 739                         break;
 740                 case 54:
 741                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 742                         break;
 743                 case 58:        /* Ignore Renewal Time Option */
 744                         break;
 745                 case 59:        /* Ignore Rebinding Time Option */
 746                         break;
 747                 case 66:        /* Ignore TFTP server name */
 748                         break;
 749                 case 67:        /* vendor opt bootfile */
 750                         /*
 751                          * I can't use dhcp_vendorex_proc here because I need
 752                          * to write into the bootp packet - even then I had to
 753                          * pass the bootp packet pointer into here as the
 754                          * second arg
 755                          */
 756                         size = truncate_sz ("Opt Boot File",
 757                                             sizeof(bp->bp_file),
 758                                             oplen);
 759                         if (bp->bp_file[0] == '\0' && size > 0) {
 760                                 /*
 761                                  * only use vendor boot file if we didn't
 762                                  * receive a boot file in the main non-vendor
 763                                  * part of the packet - god only knows why
 764                                  * some vendors chose not to use this perfectly
 765                                  * good spot to store the boot file (join on
 766                                  * Tru64 Unix) it seems mind bogglingly crazy
 767                                  * to me
 768                                  */
 769                                 printf("*** WARNING: using vendor "
 770                                         "optional boot file\n");
 771                                 memcpy(bp->bp_file, popt + 2, size);
 772                                 bp->bp_file[size] = '\0';
 773                         }
 774                         break;
 775                 default:
 776 #if defined(CONFIG_BOOTP_VENDOREX)
 777                         if (dhcp_vendorex_proc (popt))
 778                                 break;
 779 #endif
 780                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 781                         break;
 782                 }
 783                 popt += oplen + 2;      /* Process next option */
 784         }
 785 }
 786
 787 static int DhcpMessageType(unsigned char *popt)
 788 {
 789         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 790                 return -1;
 791
 792         popt += 4;
 793         while ( *popt != 0xff ) {
 794                 if ( *popt == 53 )      /* DHCP Message Type */
 795                         return *(popt + 2);
 796                 popt += *(popt + 1) + 2;        /* Scan through all options */
 797         }
 798         return -1;
 799 }
 800
 801 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 802 {
 803         volatile uchar *pkt, *iphdr;
 804         Bootp_t *bp;
 805         int pktlen, iplen, extlen;
 806         IPaddr_t OfferedIP;
 807
 808         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 809         pkt = NetTxPacket;
 810         memset ((void*)pkt, 0, PKTSIZE);
 811
 812         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 813
 814         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 815         pkt += IP_HDR_SIZE;
 816
 817         bp = (Bootp_t *)pkt;
 818         bp->bp_op = OP_BOOTREQUEST;
 819         bp->bp_htype = HWT_ETHER;
 820         bp->bp_hlen = HWL_ETHER;
 821         bp->bp_hops = 0;
 822         bp->bp_secs = htons(get_timer(0) / 1000);
 823         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 824          * the server yet */
 825
 826         /*
 827          * RFC3046 requires Relay Agents to discard packets with
 828          * nonzero and offered giaddr
 829          */
 830         NetWriteIP(&bp->bp_giaddr, 0);
 831
 832         memcpy (bp->bp_chaddr, NetOurEther, 6);
 833
 834         /*
 835          * ID is the id of the OFFER packet
 836          */
 837
 838         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 839
 840         /*
 841          * Copy options from OFFER packet if present
 842          */
 843
 844         /* Copy offered IP into the parameters request list */
 845         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 846         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 847
 848         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 849         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 850         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 851
 852         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 853 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 854         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 855 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 856         NetSendPacket(NetTxPacket, pktlen);
 857 }
 858
 859 /*
 860  *      Handle DHCP received packets.
 861  */
 862 static void
 863 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 864             unsigned len)
 865 {
 866         Bootp_t *bp = (Bootp_t *)pkt;
 867
 868         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 869                 src, dest, len, dhcp_state);
 870
 871         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 872                 return;
 873
 874         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 875                 src, dest, len, dhcp_state);
 876
 877         switch (dhcp_state) {
 878         case SELECTING:
 879                 /*
 880                  * Wait an appropriate time for any potential DHCPOFFER packets
 881                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 882                  * If filename is in format we recognize, assume it is a valid
 883                  * OFFER from a server we want.
 884                  */
 885                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 886 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 887                 if (strncmp(bp->bp_file,
 888                             CONFIG_SYS_BOOTFILE_PREFIX,
 889                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 890 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 891
 892                         debug("TRANSITIONING TO REQUESTING STATE\n");
 893                         dhcp_state = REQUESTING;
 894
 895                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 896                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 897
 898                         NetSetTimeout(TIMEOUT, BootpTimeout);
 899                         DhcpSendRequestPkt(bp);
 900 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 901                 }
 902 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 903
 904                 return;
 905                 break;
 906         case REQUESTING:
 907                 debug("DHCP State: REQUESTING\n");
 908
 909                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 910                         char *s;
 911
 912                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 913                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 914                         BootpCopyNetParams(bp); /* Store net params from reply */
 915                         dhcp_state = BOUND;
 916                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 917
 918                         /* Obey the 'autoload' setting */
 919                         if ((s = getenv("autoload")) != NULL) {
 920                                 if (*s == 'n') {
 921                                         /*
 922                                          * Just use BOOTP to configure system;
 923                                          * Do not use TFTP to load the bootfile.
 924                                          */
 925                                         NetState = NETLOOP_SUCCESS;
 926                                         return;
 927 #if defined(CONFIG_CMD_NFS)
 928                                 } else if (strcmp(s, "NFS") == 0) {
 929                                         /*
 930                                          * Use NFS to load the bootfile.
 931                                          */
 932                                         NfsStart();
 933                                         return;
 934 #endif
 935                                 }
 936                         }
 937                         TftpStart();
 938                         return;
 939                 }
 940                 break;
 941         case BOUND:
 942                 /* DHCP client bound to address */
 943                 break;
 944         default:
 945                 puts ("DHCP: INVALID STATE\n");
 946                 break;
 947         }
 948
 949 }
 950
 951 void DhcpRequest(void)
 952 {
 953         BootpRequest();
 954 }
 955 #endif  /* CONFIG_CMD_DHCP */