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