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 2000-2002 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 #if 0
  12 #define DEBUG           1       /* general debug */
  13 #define DEBUG_BOOTP_EXT 1       /* Debug received vendor fields */
  14 #endif
  15
  16 #ifdef DEBUG_BOOTP_EXT
  17 #define debug_ext(fmt,args...)  printf (fmt ,##args)
  18 #else
  19 #define debug_ext(fmt,args...)
  20 #endif
  21
  22 #include <common.h>
  23 #include <command.h>
  24 #include <net.h>
  25 #include "bootp.h"
  26 #include "tftp.h"
  27 #include "arp.h"
  28 #ifdef CONFIG_STATUS_LED
  29 #include <status_led.h>
  30 #endif
  31
  32 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  33
  34 #if (CONFIG_COMMANDS & CFG_CMD_NET)
  35
  36 #define TIMEOUT         5               /* Seconds before trying BOOTP again    */
  37 #ifndef CONFIG_NET_RETRY_COUNT
  38 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  39 #else
  40 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  41 #endif
  42
  43 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  44 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  45
  46 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  47 #define CONFIG_DHCP_MIN_EXT_LEN 64
  48 #endif
  49
  50 ulong           BootpID;
  51 int             BootpTry;
  52 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  53 ulong           seed1, seed2;
  54 #endif
  55
  56 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
  57 dhcp_state_t dhcp_state = INIT;
  58 unsigned int dhcp_leasetime = 0;
  59 IPaddr_t NetDHCPServerIP = 0;
  60 static void DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len);
  61
  62 /* For Debug */
  63 #if 0
  64 static char *dhcpmsg2str(int type)
  65 {
  66         switch (type) {
  67         case 1:  return "DHCPDISCOVER"; break;
  68         case 2:  return "DHCPOFFER";    break;
  69         case 3:  return "DHCPREQUEST";  break;
  70         case 4:  return "DHCPDECLINE";  break;
  71         case 5:  return "DHCPACK";      break;
  72         case 6:  return "DHCPNACK";     break;
  73         case 7:  return "DHCPRELEASE";  break;
  74         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  75         }
  76 }
  77 #endif
  78
  79 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
  80 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  81 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  82 #endif
  83
  84 #endif  /* CFG_CMD_DHCP */
  85
  86 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  87 {
  88         Bootp_t *bp = (Bootp_t *) pkt;
  89         int retval = 0;
  90
  91         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  92                 retval = -1;
  93         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  94                 retval = -2;
  95         else if (bp->bp_op != OP_BOOTREQUEST &&
  96             bp->bp_op != OP_BOOTREPLY &&
  97             bp->bp_op != DHCP_OFFER &&
  98             bp->bp_op != DHCP_ACK &&
  99             bp->bp_op != DHCP_NAK ) {
 100                 retval = -3;
 101         }
 102         else if (bp->bp_htype != HWT_ETHER)
 103                 retval = -4;
 104         else if (bp->bp_hlen != HWL_ETHER)
 105                 retval = -5;
 106         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
 107                 retval = -6;
 108         }
 109
 110         debug ("Filtering pkt = %d\n", retval);
 111
 112         return retval;
 113 }
 114
 115 /*
 116  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 117  */
 118 static void BootpCopyNetParams(Bootp_t *bp)
 119 {
 120         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 121         NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 122         memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
 123         copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 124
 125         debug ("Bootfile: %s\n", BootFile);
 126
 127         /* Propagate to environment:
 128          * don't delete exising entry when BOOTP / DHCP reply does
 129          * not contain a new value
 130          */
 131         if (*BootFile) {
 132                 setenv ("bootfile", BootFile);
 133         }
 134 }
 135
 136 static int truncate_sz (const char *name, int maxlen, int curlen)
 137 {
 138         if (curlen >= maxlen) {
 139                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 140                         name, curlen, maxlen);
 141                 curlen = maxlen - 1;
 142         }
 143         return (curlen);
 144 }
 145
 146 #if !(CONFIG_COMMANDS & CFG_CMD_DHCP)
 147
 148 static void BootpVendorFieldProcess(u8 *ext)
 149 {
 150     int size = *(ext+1) ;
 151
 152     debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext, *(ext+1));
 153
 154     NetBootFileSize = 0;
 155
 156     switch (*ext) {
 157     /* Fixed length fields */
 158         case 1:         /* Subnet mask                                  */
 159                 if (NetOurSubnetMask == 0)
 160                         NetCopyIP(&NetOurSubnetMask, (IPaddr_t*)(ext+2));
 161                 break;
 162         case 2:         /* Time offset - Not yet supported              */
 163                 break;
 164     /* Variable length fields */
 165         case 3:         /* Gateways list                                */
 166                 if (NetOurGatewayIP == 0) {
 167                         NetCopyIP(&NetOurGatewayIP, (IPaddr_t*)(ext+2));
 168                 }
 169                 break;
 170         case 4:         /* Time server - Not yet supported              */
 171                 break;
 172         case 5:         /* IEN-116 name server - Not yet supported      */
 173                 break;
 174         case 6:
 175                 if (NetOurDNSIP == 0) {
 176                         NetCopyIP(&NetOurDNSIP, (IPaddr_t*)(ext+2));
 177                 }
 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",
 226                                         sizeof(NetOurNISDomain),
 227                                         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_ext ("[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                 ext += ext[1] + 2 ;
 255                 if (ext <= end)
 256                     BootpVendorFieldProcess (opt) ;
 257         }
 258     }
 259
 260 #ifdef DEBUG_BOOTP_EXT
 261     printf("[BOOTP] Received fields: \n");
 262     if (NetOurSubnetMask) {
 263         puts ("NetOurSubnetMask : ");
 264         print_IPaddr (NetOurSubnetMask);
 265         putc('\n');
 266     }
 267
 268     if (NetOurGatewayIP) {
 269         puts ("NetOurGatewayIP  : ");
 270         print_IPaddr (NetOurGatewayIP);
 271         putc('\n');
 272     }
 273
 274     if (NetBootFileSize) {
 275         printf("NetBootFileSize : %d\n", NetBootFileSize);
 276     }
 277
 278     if (NetOurHostName[0]) {
 279         printf("NetOurHostName  : %s\n", NetOurHostName);
 280     }
 281
 282     if (NetOurRootPath[0]) {
 283         printf("NetOurRootPath  : %s\n", NetOurRootPath);
 284     }
 285
 286     if (NetOurNISDomain[0]) {
 287         printf("NetOurNISDomain : %s\n", NetOurNISDomain);
 288     }
 289
 290     if (NetBootFileSize) {
 291         printf("NetBootFileSize: %d\n", NetBootFileSize);
 292     }
 293 #endif  /* DEBUG_BOOTP_EXT */
 294 }
 295
 296 /*
 297  *      Handle a BOOTP received packet.
 298  */
 299 static void
 300 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 301 {
 302         Bootp_t *bp;
 303         char    *s;
 304
 305         debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
 306                 src, dest, len, sizeof (Bootp_t));
 307
 308         bp = (Bootp_t *)pkt;
 309
 310         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 311                 return;
 312
 313         /*
 314          *      Got a good BOOTP reply.  Copy the data into our variables.
 315          */
 316 #ifdef CONFIG_STATUS_LED
 317         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 318 #endif
 319
 320         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 321
 322         /* Retrieve extended information (we must parse the vendor area) */
 323         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 324                 BootpVendorProcess(&bp->bp_vend[4], len);
 325
 326         NetSetTimeout(0, (thand_f *)0);
 327
 328         debug ("Got good BOOTP\n");
 329
 330         if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
 331                 /*
 332                  * Just use BOOTP to configure system;
 333                  * Do not use TFTP to load the bootfile.
 334                  */
 335                 NetState = NETLOOP_SUCCESS;
 336                 return;
 337         }
 338
 339         /* Send ARP request to get TFTP server ethernet address.
 340          * This automagically starts TFTP, too.
 341          */
 342         ArpRequest();
 343 }
 344 #endif  /* !CFG_CMD_DHCP */
 345
 346 /*
 347  *      Timeout on BOOTP/DHCP request.
 348  */
 349 static void
 350 BootpTimeout(void)
 351 {
 352         if (BootpTry >= TIMEOUT_COUNT) {
 353                 puts ("\nRetry count exceeded; starting again\n");
 354                 NetStartAgain ();
 355         } else {
 356                 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout);
 357                 BootpRequest ();
 358         }
 359 }
 360
 361 /*
 362  *      Initialize BOOTP extension fields in the request.
 363  */
 364 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 365 static int DhcpExtended(u8 *e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 366 {
 367     u8 *start = e ;
 368     u8 *cnt;
 369 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 370     u8 *x;
 371 #endif
 372
 373     *e++ =  99;         /* RFC1048 Magic Cookie */
 374     *e++ = 130;
 375     *e++ =  83;
 376     *e++ =  99;
 377
 378     *e++ = 53;          /* DHCP Message Type */
 379     *e++ = 1;
 380     *e++ = message_type;
 381
 382     *e++ = 57;          /* Maximum DHCP Message Size */
 383     *e++ = 2;
 384     *e++ = (576-312+OPT_SIZE) >> 8;
 385     *e++ = (576-312+OPT_SIZE) & 0xff;
 386
 387     if ( ServerID ) {
 388             int tmp = ntohl(ServerID);
 389
 390             *e++ = 54;  /* ServerID */
 391             *e++ = 4;
 392             *e++ = tmp >> 24;
 393             *e++ = tmp >> 16;
 394             *e++ = tmp >> 8;
 395             *e++ = tmp & 0xff;
 396     }
 397
 398     if ( RequestedIP ) {
 399             int tmp = ntohl(RequestedIP);
 400
 401             *e++ = 50;  /* Requested IP */
 402             *e++ = 4;
 403             *e++ = tmp >> 24;
 404             *e++ = tmp >> 16;
 405             *e++ = tmp >> 8;
 406             *e++ = tmp & 0xff;
 407     }
 408
 409 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 410     if ((x = dhcp_vendorex_prep (e)))
 411         return x - start ;
 412 #endif
 413
 414     *e++ = 55;          /* Parameter Request List */
 415     cnt  = e++;         /* Pointer to count of requested items */
 416     *cnt = 0;
 417 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 418     *e++ = 1;           /* Subnet Mask */
 419     *cnt += 1;
 420 #endif
 421 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 422     *e++ = 3;           /* Router Option */
 423     *cnt += 1;
 424 #endif
 425 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 426     *e++ = 6;           /* DNS Server(s) */
 427     *cnt += 1;
 428 #endif
 429 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 430     *e++ = 12;          /* Hostname */
 431     *cnt += 1;
 432 #endif
 433 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 434     *e++ = 13;          /* Boot File Size */
 435     *cnt += 1;
 436 #endif
 437 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 438     *e++ = 17;          /* Boot path */
 439     *cnt += 1;
 440 #endif
 441 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 442     *e++ = 40;          /* NIS Domain name request */
 443     *cnt += 1;
 444 #endif
 445     *e++ = 255;         /* End of the list */
 446
 447     /* Pad to minimal length */
 448 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 449     while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
 450         *e++ = 0;
 451 #endif
 452
 453     return e - start ;
 454 }
 455
 456 #else   /* CFG_CMD_DHCP */
 457 /*
 458  *      Warning: no field size check - change CONFIG_BOOTP_MASK at your own risk!
 459  */
 460 static int BootpExtended (u8 *e)
 461 {
 462     u8 *start = e ;
 463
 464     *e++ =  99;         /* RFC1048 Magic Cookie */
 465     *e++ = 130;
 466     *e++ =  83;
 467     *e++ =  99;
 468
 469 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 470     *e++ = 53;          /* DHCP Message Type */
 471     *e++ = 1;
 472     *e++ = DHCP_DISCOVER;
 473
 474     *e++ = 57;          /* Maximum DHCP Message Size */
 475     *e++ = 2;
 476     *e++ = (576-312+OPT_SIZE) >> 16;
 477     *e++ = (576-312+OPT_SIZE) & 0xff;
 478 #endif  /* CFG_CMD_DHCP */
 479
 480 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_SUBNETMASK)
 481     *e++ =  1;          /* Subnet mask request */
 482     *e++ =  4;
 483      e  +=  4;
 484 #endif
 485
 486 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_GATEWAY)
 487     *e++ =  3;          /* Default gateway request */
 488     *e++ =  4;
 489      e  +=  4;
 490 #endif
 491
 492 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_DNS)
 493     *e++ =  6;          /* Domain Name Server */
 494     *e++ =  4;
 495      e  +=  4;
 496 #endif
 497
 498 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_HOSTNAME)
 499     *e++ = 12;          /* Host name request */
 500     *e++ = 32;
 501      e  += 32;
 502 #endif
 503
 504 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTFILESIZE)
 505     *e++ = 13;          /* Boot file size */
 506     *e++ =  2;
 507      e  +=  2;
 508 #endif
 509
 510 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_BOOTPATH)
 511     *e++ = 17;          /* Boot path */
 512     *e++ = 32;
 513      e  += 32;
 514 #endif
 515
 516 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_NISDOMAIN)
 517     *e++ = 40;          /* NIS Domain name request */
 518     *e++ = 32;
 519      e  += 32;
 520 #endif
 521
 522     *e++ = 255;         /* End of the list */
 523
 524     return e - start ;
 525 }
 526 #endif  /* CFG_CMD_DHCP */
 527
 528 void
 529 BootpRequest (void)
 530 {
 531         volatile uchar *pkt, *iphdr;
 532         Bootp_t *bp;
 533         int ext_len, pktlen, iplen;
 534
 535 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 536         dhcp_state = INIT;
 537 #endif
 538
 539 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 540         unsigned char bi_enetaddr[6];
 541         int   reg;
 542         char  *e,*s;
 543         uchar tmp[64];
 544         ulong tst1, tst2, sum, m_mask, m_value = 0;
 545
 546         if (BootpTry ==0) {
 547                 /* get our mac */
 548                 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
 549                 s = (reg > 0) ? tmp : NULL;
 550
 551                 for (reg=0; reg<6; ++reg) {
 552                         bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
 553                         if (s) {
 554                                 s = (*e) ? e+1 : e;
 555                         }
 556                 }
 557 #ifdef DEBUG
 558                 printf("BootpRequest => Our Mac: ");
 559                 for (reg=0; reg<6; reg++) {
 560                         printf ("%x%c",
 561                                 bi_enetaddr[reg],
 562                                 reg==5 ? '\n' : ':');
 563                 }
 564 #endif /* DEBUG */
 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         NetSetEther(pkt, NetBcastAddr, PROT_IP);
 618         pkt += ETHER_HDR_SIZE;
 619
 620         /*
 621          * Next line results in incorrect packet size being transmitted, resulting
 622          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 623          * set in packet header after extension length has been determined.
 624          * C. Hallinan, DS4.COM, Inc.
 625          */
 626         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 627         iphdr = pkt;    /* We need this later for NetSetIP() */
 628         pkt += IP_HDR_SIZE;
 629
 630         bp = (Bootp_t *)pkt;
 631         bp->bp_op = OP_BOOTREQUEST;
 632         bp->bp_htype = HWT_ETHER;
 633         bp->bp_hlen = HWL_ETHER;
 634         bp->bp_hops = 0;
 635         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 636         NetWriteIP(&bp->bp_ciaddr, 0);
 637         NetWriteIP(&bp->bp_yiaddr, 0);
 638         NetWriteIP(&bp->bp_siaddr, 0);
 639         NetWriteIP(&bp->bp_giaddr, 0);
 640         memcpy (bp->bp_chaddr, NetOurEther, 6);
 641         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 642
 643         /* Request additional information from the BOOTP/DHCP server */
 644 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 645         ext_len = DhcpExtended(bp->bp_vend, DHCP_DISCOVER, 0, 0);
 646 #else
 647         ext_len = BootpExtended(bp->bp_vend);
 648 #endif  /* CFG_CMD_DHCP */
 649
 650         /*
 651          *      Bootp ID is the lower 4 bytes of our ethernet address
 652          *      plus the current time in HZ.
 653          */
 654         BootpID = ((ulong)NetOurEther[2] << 24)
 655                 | ((ulong)NetOurEther[3] << 16)
 656                 | ((ulong)NetOurEther[4] << 8)
 657                 | (ulong)NetOurEther[5];
 658         BootpID += get_timer(0);
 659         BootpID  = htonl(BootpID);
 660         NetCopyLong(&bp->bp_id, &BootpID);
 661
 662         /*
 663          * Calculate proper packet lengths taking into account the
 664          * variable size of the options field
 665          */
 666         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
 667         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 668         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 669         NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
 670
 671 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 672         dhcp_state = SELECTING;
 673         NetSetHandler(DhcpHandler);
 674 #else
 675         NetSetHandler(BootpHandler);
 676 #endif  /* CFG_CMD_DHCP */
 677         NetSendPacket(NetTxPacket, pktlen);
 678 }
 679
 680 #if (CONFIG_COMMANDS & CFG_CMD_DHCP)
 681 static void DhcpOptionsProcess(uchar *popt)
 682 {
 683         uchar *end = popt + BOOTP_HDR_SIZE;
 684         int oplen, size;
 685
 686         while ( popt < end && *popt != 0xff ) {
 687                 oplen = *(popt + 1);
 688                 switch(*popt) {
 689                         case  1:
 690                                 NetCopyIP(&NetOurSubnetMask, (popt+2));
 691                                 break;
 692                         case  3:
 693                                 NetCopyIP(&NetOurGatewayIP, (popt+2));
 694                                 break;
 695                         case  6:
 696                                 NetCopyIP(&NetOurDNSIP, (popt+2));
 697                                 break;
 698                         case 12:
 699                                 size = truncate_sz ("Host Name",
 700                                                     sizeof(NetOurHostName),
 701                                                     oplen);
 702                                 memcpy(&NetOurHostName, popt+2, size);
 703                                 NetOurHostName[size] = 0 ;
 704                                 break;
 705                         case 15:                /* Ignore Domain Name Option */
 706                                 break;
 707                         case 17:
 708                                 size = truncate_sz ("Root Path",
 709                                                     sizeof(NetOurRootPath),
 710                                                     oplen);
 711                                 memcpy(&NetOurRootPath, popt+2, size);
 712                                 NetOurRootPath[size] = 0 ;
 713                                 break;
 714                         case 51:
 715                                 dhcp_leasetime = *(unsigned int *)(popt + 2);
 716                                 break;
 717                         case 53:                /* Ignore Message Type Option */
 718                                 break;
 719                         case 54:
 720                                 NetCopyIP(&NetDHCPServerIP, (popt+2));
 721                                 break;
 722                         case 58:                /* Ignore Renewal Time Option */
 723                                 break;
 724                         case 59:                /* Ignore Rebinding Time Option */
 725                                 break;
 726                         default:
 727 #if (CONFIG_BOOTP_MASK & CONFIG_BOOTP_VENDOREX)
 728                             if (dhcp_vendorex_proc(popt))
 729                                 break;
 730 #endif
 731                                 printf("*** Unhandled DHCP Option in OFFER/ACK: %d\n",
 732                                         *popt);
 733                                 break;
 734                 }
 735                 popt += oplen + 2;      /* Process next option */
 736         }
 737 }
 738
 739 static int DhcpMessageType(unsigned char *popt)
 740 {
 741         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 742                 return -1;
 743
 744         popt += 4;
 745         while ( *popt != 0xff ) {
 746                 if ( *popt == 53 )      /* DHCP Message Type */
 747                         return *(popt + 2);
 748                 popt += *(popt + 1) + 2;        /* Scan through all options */
 749         }
 750         return -1;
 751 }
 752
 753 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 754 {
 755         volatile uchar *pkt, *iphdr;
 756         Bootp_t *bp;
 757         int pktlen, iplen, extlen;
 758         IPaddr_t OfferedIP;
 759
 760         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 761         pkt = NetTxPacket;
 762         memset ((void*)pkt, 0, PKTSIZE);
 763
 764         NetSetEther(pkt, NetBcastAddr, PROT_IP);
 765         pkt += ETHER_HDR_SIZE;
 766
 767         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 768         pkt += IP_HDR_SIZE;
 769
 770         bp = (Bootp_t *)pkt;
 771         bp->bp_op = OP_BOOTREQUEST;
 772         bp->bp_htype = HWT_ETHER;
 773         bp->bp_hlen = HWL_ETHER;
 774         bp->bp_hops = 0;
 775         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 776         NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
 777         NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
 778         NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
 779         NetCopyIP(&bp->bp_giaddr, &bp_offer->bp_giaddr);
 780         memcpy (bp->bp_chaddr, NetOurEther, 6);
 781
 782         /*
 783          * ID is the id of the OFFER packet
 784          */
 785
 786         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 787
 788         /*
 789          * Copy options from OFFER packet if present
 790          */
 791         NetCopyIP(&OfferedIP, &bp->bp_yiaddr);
 792         extlen = DhcpExtended(bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 793
 794         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
 795         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 796         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 797
 798         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 799         NetSendPacket(NetTxPacket, pktlen);
 800 }
 801
 802 /*
 803  *      Handle DHCP received packets.
 804  */
 805 static void
 806 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 807 {
 808         Bootp_t *bp = (Bootp_t *)pkt;
 809
 810         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 811                 src, dest, len, dhcp_state);
 812
 813         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 814                 return;
 815
 816         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 817                 src, dest, len, dhcp_state);
 818
 819         switch (dhcp_state) {
 820         case SELECTING:
 821                 /*
 822                  * Wait an appropriate time for any potential DHCPOFFER packets
 823                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 824                  * If filename is in format we recognize, assume it is a valid
 825                  * OFFER from a server we want.
 826                  */
 827                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 828 #ifdef CFG_BOOTFILE_PREFIX
 829                 if (strncmp(bp->bp_file,
 830                             CFG_BOOTFILE_PREFIX,
 831                             strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
 832 #endif  /* CFG_BOOTFILE_PREFIX */
 833
 834                         debug ("TRANSITIONING TO REQUESTING STATE\n");
 835                         dhcp_state = REQUESTING;
 836
 837                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 838                                 DhcpOptionsProcess(&bp->bp_vend[4]);
 839
 840                         BootpCopyNetParams(bp); /* Store net params from reply */
 841
 842                         NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
 843                         DhcpSendRequestPkt(bp);
 844 #ifdef CFG_BOOTFILE_PREFIX
 845                 }
 846 #endif  /* CFG_BOOTFILE_PREFIX */
 847
 848                 return;
 849                 break;
 850         case REQUESTING:
 851                 debug ("DHCP State: REQUESTING\n");
 852
 853                 if ( DhcpMessageType(bp->bp_vend) == DHCP_ACK ) {
 854                         char *s;
 855
 856                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 857                                 DhcpOptionsProcess(&bp->bp_vend[4]);
 858                         BootpCopyNetParams(bp); /* Store net params from reply */
 859                         dhcp_state = BOUND;
 860                         printf("DHCP client bound to address ");
 861                         print_IPaddr(NetOurIP);
 862                         printf("\n");
 863
 864                         /* Obey the 'autoload' setting */
 865                         if (((s = getenv("autoload")) != NULL) && (*s == 'n')) {
 866                                 NetState = NETLOOP_SUCCESS;
 867                                 return;
 868                         }
 869                         /* Send ARP request to get TFTP server ethernet address.
 870                          * This automagically starts TFTP, too.
 871                          */
 872                         ArpRequest();
 873                         return;
 874                 }
 875                 break;
 876         default:
 877                 printf("DHCP: INVALID STATE\n");
 878                 break;
 879         }
 880
 881 }
 882
 883 void DhcpRequest(void)
 884 {
 885         BootpRequest();
 886 }
 887 #endif  /* CFG_CMD_DHCP */
 888
 889 #endif /* CFG_CMD_NET */