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 #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 "nfs.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 defined(CONFIG_CMD_NET)
  35
  36 #define TIMEOUT         5000UL  /* Milliseconds 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 defined(CONFIG_CMD_DHCP)
  57 dhcp_state_t dhcp_state = INIT;
  58 unsigned long 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 defined(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
  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         IPaddr_t tmp_ip;
 121
 122         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 123 #if !defined(CONFIG_BOOTP_SERVERIP)
 124         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 125         if (tmp_ip != 0)
 126                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 127         memcpy (NetServerEther, ((Ethernet_t *)NetRxPkt)->et_src, 6);
 128 #endif
 129         if (strlen(bp->bp_file) > 0)
 130                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 131
 132         debug ("Bootfile: %s\n", BootFile);
 133
 134         /* Propagate to environment:
 135          * don't delete exising entry when BOOTP / DHCP reply does
 136          * not contain a new value
 137          */
 138         if (*BootFile) {
 139                 setenv ("bootfile", BootFile);
 140         }
 141 }
 142
 143 static int truncate_sz (const char *name, int maxlen, int curlen)
 144 {
 145         if (curlen >= maxlen) {
 146                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 147                         name, curlen, maxlen);
 148                 curlen = maxlen - 1;
 149         }
 150         return (curlen);
 151 }
 152
 153 #if !defined(CONFIG_CMD_DHCP)
 154
 155 static void BootpVendorFieldProcess (u8 * ext)
 156 {
 157         int size = *(ext + 1);
 158
 159         debug_ext ("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 160                    *(ext + 1));
 161
 162         NetBootFileSize = 0;
 163
 164         switch (*ext) {
 165                 /* Fixed length fields */
 166         case 1:                 /* Subnet mask                                  */
 167                 if (NetOurSubnetMask == 0)
 168                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 169                 break;
 170         case 2:                 /* Time offset - Not yet supported              */
 171                 break;
 172                 /* Variable length fields */
 173         case 3:                 /* Gateways list                                */
 174                 if (NetOurGatewayIP == 0) {
 175                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 176                 }
 177                 break;
 178         case 4:                 /* Time server - Not yet supported              */
 179                 break;
 180         case 5:                 /* IEN-116 name server - Not yet supported      */
 181                 break;
 182         case 6:
 183                 if (NetOurDNSIP == 0) {
 184                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 185                 }
 186 #if defined(CONFIG_BOOTP_DNS2)
 187                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 188                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 189                 }
 190 #endif
 191                 break;
 192         case 7:                 /* Log server - Not yet supported               */
 193                 break;
 194         case 8:                 /* Cookie/Quote server - Not yet supported      */
 195                 break;
 196         case 9:                 /* LPR server - Not yet supported               */
 197                 break;
 198         case 10:                /* Impress server - Not yet supported           */
 199                 break;
 200         case 11:                /* RPL server - Not yet supported               */
 201                 break;
 202         case 12:                /* Host name                                    */
 203                 if (NetOurHostName[0] == 0) {
 204                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 205                         memcpy (&NetOurHostName, ext + 2, size);
 206                         NetOurHostName[size] = 0;
 207                 }
 208                 break;
 209         case 13:                /* Boot file size                               */
 210                 if (size == 2)
 211                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 212                 else if (size == 4)
 213                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 214                 break;
 215         case 14:                /* Merit dump file - Not yet supported          */
 216                 break;
 217         case 15:                /* Domain name - Not yet supported              */
 218                 break;
 219         case 16:                /* Swap server - Not yet supported              */
 220                 break;
 221         case 17:                /* Root path                                    */
 222                 if (NetOurRootPath[0] == 0) {
 223                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 224                         memcpy (&NetOurRootPath, ext + 2, size);
 225                         NetOurRootPath[size] = 0;
 226                 }
 227                 break;
 228         case 18:                /* Extension path - Not yet supported           */
 229                 /*
 230                  * This can be used to send the information of the
 231                  * vendor area in another file that the client can
 232                  * access via TFTP.
 233                  */
 234                 break;
 235                 /* IP host layer fields */
 236         case 40:                /* NIS Domain name                              */
 237                 if (NetOurNISDomain[0] == 0) {
 238                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 239                         memcpy (&NetOurNISDomain, ext + 2, size);
 240                         NetOurNISDomain[size] = 0;
 241                 }
 242                 break;
 243                 /* Application layer fields */
 244         case 43:                /* Vendor specific info - Not yet supported     */
 245                 /*
 246                  * Binary information to exchange specific
 247                  * product information.
 248                  */
 249                 break;
 250                 /* Reserved (custom) fields (128..254) */
 251         }
 252 }
 253
 254 static void BootpVendorProcess (u8 * ext, int size)
 255 {
 256         u8 *end = ext + size;
 257
 258         debug_ext ("[BOOTP] Checking extension (%d bytes)...\n", size);
 259
 260         while ((ext < end) && (*ext != 0xff)) {
 261                 if (*ext == 0) {
 262                         ext++;
 263                 } else {
 264                         u8 *opt = ext;
 265
 266                         ext += ext[1] + 2;
 267                         if (ext <= end)
 268                                 BootpVendorFieldProcess (opt);
 269                 }
 270         }
 271
 272 #ifdef DEBUG_BOOTP_EXT
 273         puts ("[BOOTP] Received fields: \n");
 274         if (NetOurSubnetMask)
 275                 printf ("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
 276
 277         if (NetOurGatewayIP)
 278                 printf ("NetOurGatewayIP        : %pI4", &NetOurGatewayIP);
 279
 280         if (NetBootFileSize) {
 281                 printf ("NetBootFileSize : %d\n", NetBootFileSize);
 282         }
 283
 284         if (NetOurHostName[0]) {
 285                 printf ("NetOurHostName  : %s\n", NetOurHostName);
 286         }
 287
 288         if (NetOurRootPath[0]) {
 289                 printf ("NetOurRootPath  : %s\n", NetOurRootPath);
 290         }
 291
 292         if (NetOurNISDomain[0]) {
 293                 printf ("NetOurNISDomain : %s\n", NetOurNISDomain);
 294         }
 295
 296         if (NetBootFileSize) {
 297                 printf ("NetBootFileSize: %d\n", NetBootFileSize);
 298         }
 299 #endif /* DEBUG_BOOTP_EXT */
 300 }
 301 /*
 302  *      Handle a BOOTP received packet.
 303  */
 304 static void
 305 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 306 {
 307         Bootp_t *bp;
 308         char    *s;
 309
 310         debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 311                 src, dest, len, sizeof (Bootp_t));
 312
 313         bp = (Bootp_t *)pkt;
 314
 315         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 316                 return;
 317
 318         /*
 319          *      Got a good BOOTP reply.  Copy the data into our variables.
 320          */
 321 #ifdef CONFIG_STATUS_LED
 322         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 323 #endif
 324
 325         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 326
 327         /* Retrieve extended information (we must parse the vendor area) */
 328         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 329                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 330
 331         NetSetTimeout(0, (thand_f *)0);
 332
 333         debug ("Got good BOOTP\n");
 334
 335         if ((s = getenv("autoload")) != NULL) {
 336                 if (*s == 'n') {
 337                         /*
 338                          * Just use BOOTP to configure system;
 339                          * Do not use TFTP to load the bootfile.
 340                          */
 341                         NetState = NETLOOP_SUCCESS;
 342                         return;
 343 #if defined(CONFIG_CMD_NFS)
 344                 } else if (strcmp(s, "NFS") == 0) {
 345                         /*
 346                          * Use NFS to load the bootfile.
 347                          */
 348                         NfsStart();
 349                         return;
 350 #endif
 351                 }
 352         }
 353
 354         TftpStart();
 355 }
 356 #endif
 357
 358 /*
 359  *      Timeout on BOOTP/DHCP request.
 360  */
 361 static void
 362 BootpTimeout(void)
 363 {
 364         if (BootpTry >= TIMEOUT_COUNT) {
 365                 puts ("\nRetry count exceeded; starting again\n");
 366                 NetStartAgain ();
 367         } else {
 368                 NetSetTimeout (TIMEOUT, BootpTimeout);
 369                 BootpRequest ();
 370         }
 371 }
 372
 373 /*
 374  *      Initialize BOOTP extension fields in the request.
 375  */
 376 #if defined(CONFIG_CMD_DHCP)
 377 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 378 {
 379         u8 *start = e;
 380         u8 *cnt;
 381
 382 #if defined(CONFIG_BOOTP_VENDOREX)
 383         u8 *x;
 384 #endif
 385 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 386         char *hostname;
 387 #endif
 388
 389         *e++ = 99;              /* RFC1048 Magic Cookie */
 390         *e++ = 130;
 391         *e++ = 83;
 392         *e++ = 99;
 393
 394         *e++ = 53;              /* DHCP Message Type */
 395         *e++ = 1;
 396         *e++ = message_type;
 397
 398         *e++ = 57;              /* Maximum DHCP Message Size */
 399         *e++ = 2;
 400         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 401         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 402
 403         if (ServerID) {
 404                 int tmp = ntohl (ServerID);
 405
 406                 *e++ = 54;      /* ServerID */
 407                 *e++ = 4;
 408                 *e++ = tmp >> 24;
 409                 *e++ = tmp >> 16;
 410                 *e++ = tmp >> 8;
 411                 *e++ = tmp & 0xff;
 412         }
 413
 414         if (RequestedIP) {
 415                 int tmp = ntohl (RequestedIP);
 416
 417                 *e++ = 50;      /* Requested IP */
 418                 *e++ = 4;
 419                 *e++ = tmp >> 24;
 420                 *e++ = tmp >> 16;
 421                 *e++ = tmp >> 8;
 422                 *e++ = tmp & 0xff;
 423         }
 424 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 425         if ((hostname = getenv ("hostname"))) {
 426                 int hostnamelen = strlen (hostname);
 427
 428                 *e++ = 12;      /* Hostname */
 429                 *e++ = hostnamelen;
 430                 memcpy (e, hostname, hostnamelen);
 431                 e += hostnamelen;
 432         }
 433 #endif
 434
 435 #if defined(CONFIG_BOOTP_VENDOREX)
 436         if ((x = dhcp_vendorex_prep (e)))
 437                 return x - start;
 438 #endif
 439
 440         *e++ = 55;              /* Parameter Request List */
 441          cnt = e++;             /* Pointer to count of requested items */
 442         *cnt = 0;
 443 #if defined(CONFIG_BOOTP_SUBNETMASK)
 444         *e++  = 1;              /* Subnet Mask */
 445         *cnt += 1;
 446 #endif
 447 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 448         *e++  = 2;
 449         *cnt += 1;
 450 #endif
 451 #if defined(CONFIG_BOOTP_GATEWAY)
 452         *e++  = 3;              /* Router Option */
 453         *cnt += 1;
 454 #endif
 455 #if defined(CONFIG_BOOTP_DNS)
 456         *e++  = 6;              /* DNS Server(s) */
 457         *cnt += 1;
 458 #endif
 459 #if defined(CONFIG_BOOTP_HOSTNAME)
 460         *e++  = 12;             /* Hostname */
 461         *cnt += 1;
 462 #endif
 463 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 464         *e++  = 13;             /* Boot File Size */
 465         *cnt += 1;
 466 #endif
 467 #if defined(CONFIG_BOOTP_BOOTPATH)
 468         *e++  = 17;             /* Boot path */
 469         *cnt += 1;
 470 #endif
 471 #if defined(CONFIG_BOOTP_NISDOMAIN)
 472         *e++  = 40;             /* NIS Domain name request */
 473         *cnt += 1;
 474 #endif
 475 #if defined(CONFIG_BOOTP_NTPSERVER)
 476         *e++  = 42;
 477         *cnt += 1;
 478 #endif
 479         *e++  = 255;            /* End of the list */
 480
 481         /* Pad to minimal length */
 482 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 483         while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
 484                 *e++ = 0;
 485 #endif
 486
 487         return e - start;
 488 }
 489
 490 #else
 491 /*
 492  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 493  */
 494 static int BootpExtended (u8 * e)
 495 {
 496         u8 *start = e;
 497
 498         *e++ = 99;              /* RFC1048 Magic Cookie */
 499         *e++ = 130;
 500         *e++ = 83;
 501         *e++ = 99;
 502
 503 #if defined(CONFIG_CMD_DHCP)
 504         *e++ = 53;              /* DHCP Message Type */
 505         *e++ = 1;
 506         *e++ = DHCP_DISCOVER;
 507
 508         *e++ = 57;              /* Maximum DHCP Message Size */
 509         *e++ = 2;
 510         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 511         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 512 #endif
 513
 514 #if defined(CONFIG_BOOTP_SUBNETMASK)
 515         *e++ = 1;               /* Subnet mask request */
 516         *e++ = 4;
 517         e   += 4;
 518 #endif
 519
 520 #if defined(CONFIG_BOOTP_GATEWAY)
 521         *e++ = 3;               /* Default gateway request */
 522         *e++ = 4;
 523         e   += 4;
 524 #endif
 525
 526 #if defined(CONFIG_BOOTP_DNS)
 527         *e++ = 6;               /* Domain Name Server */
 528         *e++ = 4;
 529         e   += 4;
 530 #endif
 531
 532 #if defined(CONFIG_BOOTP_HOSTNAME)
 533         *e++ = 12;              /* Host name request */
 534         *e++ = 32;
 535         e   += 32;
 536 #endif
 537
 538 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 539         *e++ = 13;              /* Boot file size */
 540         *e++ = 2;
 541         e   += 2;
 542 #endif
 543
 544 #if defined(CONFIG_BOOTP_BOOTPATH)
 545         *e++ = 17;              /* Boot path */
 546         *e++ = 32;
 547         e   += 32;
 548 #endif
 549
 550 #if defined(CONFIG_BOOTP_NISDOMAIN)
 551         *e++ = 40;              /* NIS Domain name request */
 552         *e++ = 32;
 553         e   += 32;
 554 #endif
 555
 556         *e++ = 255;             /* End of the list */
 557
 558         return e - start;
 559 }
 560 #endif
 561
 562 void
 563 BootpRequest (void)
 564 {
 565         volatile uchar *pkt, *iphdr;
 566         Bootp_t *bp;
 567         int ext_len, pktlen, iplen;
 568
 569 #if defined(CONFIG_CMD_DHCP)
 570         dhcp_state = INIT;
 571 #endif
 572
 573 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 574         unsigned char bi_enetaddr[6];
 575         int   reg;
 576         char  *e,*s;
 577         char tmp[64];
 578         ulong tst1, tst2, sum, m_mask, m_value = 0;
 579
 580         if (BootpTry ==0) {
 581                 /* get our mac */
 582                 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
 583                 s = (reg > 0) ? tmp : NULL;
 584
 585                 for (reg=0; reg<6; ++reg) {
 586                         bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
 587                         if (s) {
 588                                 s = (*e) ? e+1 : e;
 589                         }
 590                 }
 591 #ifdef DEBUG
 592                 puts ("BootpRequest => Our Mac: ");
 593                 for (reg=0; reg<6; reg++) {
 594                         printf ("%x%c",
 595                                 bi_enetaddr[reg],
 596                                 reg==5 ? '\n' : ':');
 597                 }
 598 #endif /* DEBUG */
 599
 600                 /* Mac-Manipulation 2 get seed1 */
 601                 tst1=0;
 602                 tst2=0;
 603                 for (reg=2; reg<6; reg++) {
 604                         tst1 = tst1 << 8;
 605                         tst1 = tst1 | bi_enetaddr[reg];
 606                 }
 607                 for (reg=0; reg<2; reg++) {
 608                         tst2 = tst2 | bi_enetaddr[reg];
 609                         tst2 = tst2 << 8;
 610                 }
 611
 612                 seed1 = tst1^tst2;
 613
 614                 /* Mirror seed1*/
 615                 m_mask=0x1;
 616                 for (reg=1;reg<=32;reg++) {
 617                         m_value |= (m_mask & seed1);
 618                         seed1 = seed1 >> 1;
 619                         m_value = m_value << 1;
 620                 }
 621                 seed1 = m_value;
 622                 seed2 = 0xB78D0945;
 623         }
 624
 625         /* Random Number Generator */
 626
 627         for (reg=0;reg<=0;reg++) {
 628                 sum = seed1 + seed2;
 629                 if (sum < seed1 || sum < seed2)
 630                         sum++;
 631                 seed2 = seed1;
 632                 seed1 = sum;
 633
 634                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 635                         sum = sum >> (22-BootpTry);
 636                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 637                         sum = sum >> 19;
 638                 }
 639         }
 640
 641         printf ("Random delay: %ld ms...\n", sum);
 642         for (reg=0; reg <sum; reg++) {
 643                 udelay(1000); /*Wait 1ms*/
 644         }
 645 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 646
 647         printf("BOOTP broadcast %d\n", ++BootpTry);
 648         pkt = NetTxPacket;
 649         memset ((void*)pkt, 0, PKTSIZE);
 650
 651         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 652
 653         /*
 654          * Next line results in incorrect packet size being transmitted, resulting
 655          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 656          * set in packet header after extension length has been determined.
 657          * C. Hallinan, DS4.COM, Inc.
 658          */
 659         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 660         iphdr = pkt;    /* We need this later for NetSetIP() */
 661         pkt += IP_HDR_SIZE;
 662
 663         bp = (Bootp_t *)pkt;
 664         bp->bp_op = OP_BOOTREQUEST;
 665         bp->bp_htype = HWT_ETHER;
 666         bp->bp_hlen = HWL_ETHER;
 667         bp->bp_hops = 0;
 668         bp->bp_secs = htons(get_timer(0) / 1000);
 669         NetWriteIP(&bp->bp_ciaddr, 0);
 670         NetWriteIP(&bp->bp_yiaddr, 0);
 671         NetWriteIP(&bp->bp_siaddr, 0);
 672         NetWriteIP(&bp->bp_giaddr, 0);
 673         memcpy (bp->bp_chaddr, NetOurEther, 6);
 674         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 675
 676         /* Request additional information from the BOOTP/DHCP server */
 677 #if defined(CONFIG_CMD_DHCP)
 678         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 679 #else
 680         ext_len = BootpExtended((u8 *)bp->bp_vend);
 681 #endif
 682
 683         /*
 684          *      Bootp ID is the lower 4 bytes of our ethernet address
 685          *      plus the current time in ms.
 686          */
 687         BootpID = ((ulong)NetOurEther[2] << 24)
 688                 | ((ulong)NetOurEther[3] << 16)
 689                 | ((ulong)NetOurEther[4] << 8)
 690                 | (ulong)NetOurEther[5];
 691         BootpID += get_timer(0);
 692         BootpID  = htonl(BootpID);
 693         NetCopyLong(&bp->bp_id, &BootpID);
 694
 695         /*
 696          * Calculate proper packet lengths taking into account the
 697          * variable size of the options field
 698          */
 699         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
 700         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 701         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 702         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 703
 704 #if defined(CONFIG_CMD_DHCP)
 705         dhcp_state = SELECTING;
 706         NetSetHandler(DhcpHandler);
 707 #else
 708         NetSetHandler(BootpHandler);
 709 #endif
 710         NetSendPacket(NetTxPacket, pktlen);
 711 }
 712
 713 #if defined(CONFIG_CMD_DHCP)
 714 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 715 {
 716         uchar *end = popt + BOOTP_HDR_SIZE;
 717         int oplen, size;
 718
 719         while (popt < end && *popt != 0xff) {
 720                 oplen = *(popt + 1);
 721                 switch (*popt) {
 722                 case 1:
 723                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 724                         break;
 725 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 726                 case 2:         /* Time offset  */
 727                         NetCopyLong ((ulong *)&NetTimeOffset, (ulong *) (popt + 2));
 728                         NetTimeOffset = ntohl (NetTimeOffset);
 729                         break;
 730 #endif
 731                 case 3:
 732                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 733                         break;
 734                 case 6:
 735                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 736 #if defined(CONFIG_BOOTP_DNS2)
 737                         if (*(popt + 1) > 4) {
 738                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 739                         }
 740 #endif
 741                         break;
 742                 case 12:
 743                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 744                         memcpy (&NetOurHostName, popt + 2, size);
 745                         NetOurHostName[size] = 0;
 746                         break;
 747                 case 15:        /* Ignore Domain Name Option */
 748                         break;
 749                 case 17:
 750                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 751                         memcpy (&NetOurRootPath, popt + 2, size);
 752                         NetOurRootPath[size] = 0;
 753                         break;
 754 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 755                 case 42:        /* NTP server IP */
 756                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 757                         break;
 758 #endif
 759                 case 51:
 760                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 761                         break;
 762                 case 53:        /* Ignore Message Type Option */
 763                         break;
 764                 case 54:
 765                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 766                         break;
 767                 case 58:        /* Ignore Renewal Time Option */
 768                         break;
 769                 case 59:        /* Ignore Rebinding Time Option */
 770                         break;
 771                 case 66:        /* Ignore TFTP server name */
 772                         break;
 773                 case 67:        /* vendor opt bootfile */
 774                         /*
 775                          * I can't use dhcp_vendorex_proc here because I need
 776                          * to write into the bootp packet - even then I had to
 777                          * pass the bootp packet pointer into here as the
 778                          * second arg
 779                          */
 780                         size = truncate_sz ("Opt Boot File",
 781                                             sizeof(bp->bp_file),
 782                                             oplen);
 783                         if (bp->bp_file[0] == '\0' && size > 0) {
 784                                 /*
 785                                  * only use vendor boot file if we didn't
 786                                  * receive a boot file in the main non-vendor
 787                                  * part of the packet - god only knows why
 788                                  * some vendors chose not to use this perfectly
 789                                  * good spot to store the boot file (join on
 790                                  * Tru64 Unix) it seems mind bogglingly crazy
 791                                  * to me
 792                                  */
 793                                 printf("*** WARNING: using vendor "
 794                                         "optional boot file\n");
 795                                 memcpy(bp->bp_file, popt + 2, size);
 796                                 bp->bp_file[size] = '\0';
 797                         }
 798                         break;
 799                 default:
 800 #if defined(CONFIG_BOOTP_VENDOREX)
 801                         if (dhcp_vendorex_proc (popt))
 802                                 break;
 803 #endif
 804                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 805                         break;
 806                 }
 807                 popt += oplen + 2;      /* Process next option */
 808         }
 809 }
 810
 811 static int DhcpMessageType(unsigned char *popt)
 812 {
 813         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 814                 return -1;
 815
 816         popt += 4;
 817         while ( *popt != 0xff ) {
 818                 if ( *popt == 53 )      /* DHCP Message Type */
 819                         return *(popt + 2);
 820                 popt += *(popt + 1) + 2;        /* Scan through all options */
 821         }
 822         return -1;
 823 }
 824
 825 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 826 {
 827         volatile uchar *pkt, *iphdr;
 828         Bootp_t *bp;
 829         int pktlen, iplen, extlen;
 830         IPaddr_t OfferedIP;
 831
 832         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 833         pkt = NetTxPacket;
 834         memset ((void*)pkt, 0, PKTSIZE);
 835
 836         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 837
 838         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 839         pkt += IP_HDR_SIZE;
 840
 841         bp = (Bootp_t *)pkt;
 842         bp->bp_op = OP_BOOTREQUEST;
 843         bp->bp_htype = HWT_ETHER;
 844         bp->bp_hlen = HWL_ETHER;
 845         bp->bp_hops = 0;
 846         bp->bp_secs = htons(get_timer(0) / 1000);
 847         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 848          * the server yet */
 849
 850         /*
 851          * RFC3046 requires Relay Agents to discard packets with
 852          * nonzero and offered giaddr
 853          */
 854         NetWriteIP(&bp->bp_giaddr, 0);
 855
 856         memcpy (bp->bp_chaddr, NetOurEther, 6);
 857
 858         /*
 859          * ID is the id of the OFFER packet
 860          */
 861
 862         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 863
 864         /*
 865          * Copy options from OFFER packet if present
 866          */
 867
 868         /* Copy offered IP into the parameters request list */
 869         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 870         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 871
 872         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
 873         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 874         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 875
 876         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 877 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 878         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 879 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 880         NetSendPacket(NetTxPacket, pktlen);
 881 }
 882
 883 /*
 884  *      Handle DHCP received packets.
 885  */
 886 static void
 887 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 888 {
 889         Bootp_t *bp = (Bootp_t *)pkt;
 890
 891         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 892                 src, dest, len, dhcp_state);
 893
 894         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 895                 return;
 896
 897         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 898                 src, dest, len, dhcp_state);
 899
 900         switch (dhcp_state) {
 901         case SELECTING:
 902                 /*
 903                  * Wait an appropriate time for any potential DHCPOFFER packets
 904                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 905                  * If filename is in format we recognize, assume it is a valid
 906                  * OFFER from a server we want.
 907                  */
 908                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 909 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 910                 if (strncmp(bp->bp_file,
 911                             CONFIG_SYS_BOOTFILE_PREFIX,
 912                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 913 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 914
 915                         debug ("TRANSITIONING TO REQUESTING STATE\n");
 916                         dhcp_state = REQUESTING;
 917
 918                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 919                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 920
 921                         NetSetTimeout(TIMEOUT, BootpTimeout);
 922                         DhcpSendRequestPkt(bp);
 923 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 924                 }
 925 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 926
 927                 return;
 928                 break;
 929         case REQUESTING:
 930                 debug ("DHCP State: REQUESTING\n");
 931
 932                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 933                         char *s;
 934
 935                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 936                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 937                         BootpCopyNetParams(bp); /* Store net params from reply */
 938                         dhcp_state = BOUND;
 939                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 940
 941                         /* Obey the 'autoload' setting */
 942                         if ((s = getenv("autoload")) != NULL) {
 943                                 if (*s == 'n') {
 944                                         /*
 945                                          * Just use BOOTP to configure system;
 946                                          * Do not use TFTP to load the bootfile.
 947                                          */
 948                                         NetState = NETLOOP_SUCCESS;
 949                                         return;
 950 #if defined(CONFIG_CMD_NFS)
 951                                 } else if (strcmp(s, "NFS") == 0) {
 952                                         /*
 953                                          * Use NFS to load the bootfile.
 954                                          */
 955                                         NfsStart();
 956                                         return;
 957 #endif
 958                                 }
 959                         }
 960                         TftpStart();
 961                         return;
 962                 }
 963                 break;
 964         case BOUND:
 965                 /* DHCP client bound to address */
 966                 break;
 967         default:
 968                 puts ("DHCP: INVALID STATE\n");
 969                 break;
 970         }
 971
 972 }
 973
 974 void DhcpRequest(void)
 975 {
 976         BootpRequest();
 977 }
 978 #endif  /* CONFIG_CMD_DHCP */
 979
 980 #endif  /* CONFIG_CMD_NET */