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         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 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                 puts ("NetOurSubnetMask : ");
 276                 print_IPaddr (NetOurSubnetMask);
 277                 putc ('\n');
 278         }
 279
 280         if (NetOurGatewayIP) {
 281                 puts ("NetOurGatewayIP  : ");
 282                 print_IPaddr (NetOurGatewayIP);
 283                 putc ('\n');
 284         }
 285
 286         if (NetBootFileSize) {
 287                 printf ("NetBootFileSize : %d\n", NetBootFileSize);
 288         }
 289
 290         if (NetOurHostName[0]) {
 291                 printf ("NetOurHostName  : %s\n", NetOurHostName);
 292         }
 293
 294         if (NetOurRootPath[0]) {
 295                 printf ("NetOurRootPath  : %s\n", NetOurRootPath);
 296         }
 297
 298         if (NetOurNISDomain[0]) {
 299                 printf ("NetOurNISDomain : %s\n", NetOurNISDomain);
 300         }
 301
 302         if (NetBootFileSize) {
 303                 printf ("NetBootFileSize: %d\n", NetBootFileSize);
 304         }
 305 #endif /* DEBUG_BOOTP_EXT */
 306 }
 307 /*
 308  *      Handle a BOOTP received packet.
 309  */
 310 static void
 311 BootpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 312 {
 313         Bootp_t *bp;
 314         char    *s;
 315
 316         debug ("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%d)\n",
 317                 src, dest, len, sizeof (Bootp_t));
 318
 319         bp = (Bootp_t *)pkt;
 320
 321         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 322                 return;
 323
 324         /*
 325          *      Got a good BOOTP reply.  Copy the data into our variables.
 326          */
 327 #ifdef CONFIG_STATUS_LED
 328         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 329 #endif
 330
 331         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 332
 333         /* Retrieve extended information (we must parse the vendor area) */
 334         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 335                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 336
 337         NetSetTimeout(0, (thand_f *)0);
 338
 339         debug ("Got good BOOTP\n");
 340
 341         if ((s = getenv("autoload")) != NULL) {
 342                 if (*s == 'n') {
 343                         /*
 344                          * Just use BOOTP to configure system;
 345                          * Do not use TFTP to load the bootfile.
 346                          */
 347                         NetState = NETLOOP_SUCCESS;
 348                         return;
 349 #if defined(CONFIG_CMD_NFS)
 350                 } else if (strcmp(s, "NFS") == 0) {
 351                         /*
 352                          * Use NFS to load the bootfile.
 353                          */
 354                         NfsStart();
 355                         return;
 356 #endif
 357                 }
 358         }
 359
 360         TftpStart();
 361 }
 362 #endif
 363
 364 /*
 365  *      Timeout on BOOTP/DHCP request.
 366  */
 367 static void
 368 BootpTimeout(void)
 369 {
 370         if (BootpTry >= TIMEOUT_COUNT) {
 371                 puts ("\nRetry count exceeded; starting again\n");
 372                 NetStartAgain ();
 373         } else {
 374                 NetSetTimeout (TIMEOUT * CFG_HZ, BootpTimeout);
 375                 BootpRequest ();
 376         }
 377 }
 378
 379 /*
 380  *      Initialize BOOTP extension fields in the request.
 381  */
 382 #if defined(CONFIG_CMD_DHCP)
 383 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 384 {
 385         u8 *start = e;
 386         u8 *cnt;
 387
 388 #if defined(CONFIG_BOOTP_VENDOREX)
 389         u8 *x;
 390 #endif
 391 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 392         char *hostname;
 393 #endif
 394
 395         *e++ = 99;              /* RFC1048 Magic Cookie */
 396         *e++ = 130;
 397         *e++ = 83;
 398         *e++ = 99;
 399
 400         *e++ = 53;              /* DHCP Message Type */
 401         *e++ = 1;
 402         *e++ = message_type;
 403
 404         *e++ = 57;              /* Maximum DHCP Message Size */
 405         *e++ = 2;
 406         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 407         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 408
 409         if (ServerID) {
 410                 int tmp = ntohl (ServerID);
 411
 412                 *e++ = 54;      /* ServerID */
 413                 *e++ = 4;
 414                 *e++ = tmp >> 24;
 415                 *e++ = tmp >> 16;
 416                 *e++ = tmp >> 8;
 417                 *e++ = tmp & 0xff;
 418         }
 419
 420         if (RequestedIP) {
 421                 int tmp = ntohl (RequestedIP);
 422
 423                 *e++ = 50;      /* Requested IP */
 424                 *e++ = 4;
 425                 *e++ = tmp >> 24;
 426                 *e++ = tmp >> 16;
 427                 *e++ = tmp >> 8;
 428                 *e++ = tmp & 0xff;
 429         }
 430 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 431         if ((hostname = getenv ("hostname"))) {
 432                 int hostnamelen = strlen (hostname);
 433
 434                 *e++ = 12;      /* Hostname */
 435                 *e++ = hostnamelen;
 436                 memcpy (e, hostname, hostnamelen);
 437                 e += hostnamelen;
 438         }
 439 #endif
 440
 441 #if defined(CONFIG_BOOTP_VENDOREX)
 442         if ((x = dhcp_vendorex_prep (e)))
 443                 return x - start;
 444 #endif
 445
 446         *e++ = 55;              /* Parameter Request List */
 447          cnt = e++;             /* Pointer to count of requested items */
 448         *cnt = 0;
 449 #if defined(CONFIG_BOOTP_SUBNETMASK)
 450         *e++  = 1;              /* Subnet Mask */
 451         *cnt += 1;
 452 #endif
 453 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 454         *e++  = 2;
 455         *cnt += 1;
 456 #endif
 457 #if defined(CONFIG_BOOTP_GATEWAY)
 458         *e++  = 3;              /* Router Option */
 459         *cnt += 1;
 460 #endif
 461 #if defined(CONFIG_BOOTP_DNS)
 462         *e++  = 6;              /* DNS Server(s) */
 463         *cnt += 1;
 464 #endif
 465 #if defined(CONFIG_BOOTP_HOSTNAME)
 466         *e++  = 12;             /* Hostname */
 467         *cnt += 1;
 468 #endif
 469 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 470         *e++  = 13;             /* Boot File Size */
 471         *cnt += 1;
 472 #endif
 473 #if defined(CONFIG_BOOTP_BOOTPATH)
 474         *e++  = 17;             /* Boot path */
 475         *cnt += 1;
 476 #endif
 477 #if defined(CONFIG_BOOTP_NISDOMAIN)
 478         *e++  = 40;             /* NIS Domain name request */
 479         *cnt += 1;
 480 #endif
 481 #if defined(CONFIG_BOOTP_NTPSERVER)
 482         *e++  = 42;
 483         *cnt += 1;
 484 #endif
 485         *e++  = 255;            /* End of the list */
 486
 487         /* Pad to minimal length */
 488 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 489         while ((e - start) <= CONFIG_DHCP_MIN_EXT_LEN)
 490                 *e++ = 0;
 491 #endif
 492
 493         return e - start;
 494 }
 495
 496 #else
 497 /*
 498  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 499  */
 500 static int BootpExtended (u8 * e)
 501 {
 502         u8 *start = e;
 503
 504         *e++ = 99;              /* RFC1048 Magic Cookie */
 505         *e++ = 130;
 506         *e++ = 83;
 507         *e++ = 99;
 508
 509 #if defined(CONFIG_CMD_DHCP)
 510         *e++ = 53;              /* DHCP Message Type */
 511         *e++ = 1;
 512         *e++ = DHCP_DISCOVER;
 513
 514         *e++ = 57;              /* Maximum DHCP Message Size */
 515         *e++ = 2;
 516         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 517         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 518 #endif
 519
 520 #if defined(CONFIG_BOOTP_SUBNETMASK)
 521         *e++ = 1;               /* Subnet mask request */
 522         *e++ = 4;
 523         e   += 4;
 524 #endif
 525
 526 #if defined(CONFIG_BOOTP_GATEWAY)
 527         *e++ = 3;               /* Default gateway request */
 528         *e++ = 4;
 529         e   += 4;
 530 #endif
 531
 532 #if defined(CONFIG_BOOTP_DNS)
 533         *e++ = 6;               /* Domain Name Server */
 534         *e++ = 4;
 535         e   += 4;
 536 #endif
 537
 538 #if defined(CONFIG_BOOTP_HOSTNAME)
 539         *e++ = 12;              /* Host name request */
 540         *e++ = 32;
 541         e   += 32;
 542 #endif
 543
 544 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 545         *e++ = 13;              /* Boot file size */
 546         *e++ = 2;
 547         e   += 2;
 548 #endif
 549
 550 #if defined(CONFIG_BOOTP_BOOTPATH)
 551         *e++ = 17;              /* Boot path */
 552         *e++ = 32;
 553         e   += 32;
 554 #endif
 555
 556 #if defined(CONFIG_BOOTP_NISDOMAIN)
 557         *e++ = 40;              /* NIS Domain name request */
 558         *e++ = 32;
 559         e   += 32;
 560 #endif
 561
 562         *e++ = 255;             /* End of the list */
 563
 564         return e - start;
 565 }
 566 #endif
 567
 568 void
 569 BootpRequest (void)
 570 {
 571         volatile uchar *pkt, *iphdr;
 572         Bootp_t *bp;
 573         int ext_len, pktlen, iplen;
 574
 575 #if defined(CONFIG_CMD_DHCP)
 576         dhcp_state = INIT;
 577 #endif
 578
 579 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 580         unsigned char bi_enetaddr[6];
 581         int   reg;
 582         char  *e,*s;
 583         char tmp[64];
 584         ulong tst1, tst2, sum, m_mask, m_value = 0;
 585
 586         if (BootpTry ==0) {
 587                 /* get our mac */
 588                 reg = getenv_r ("ethaddr", tmp, sizeof(tmp));
 589                 s = (reg > 0) ? tmp : NULL;
 590
 591                 for (reg=0; reg<6; ++reg) {
 592                         bi_enetaddr[reg] = s ? simple_strtoul(s, &e, 16) : 0;
 593                         if (s) {
 594                                 s = (*e) ? e+1 : e;
 595                         }
 596                 }
 597 #ifdef DEBUG
 598                 puts ("BootpRequest => Our Mac: ");
 599                 for (reg=0; reg<6; reg++) {
 600                         printf ("%x%c",
 601                                 bi_enetaddr[reg],
 602                                 reg==5 ? '\n' : ':');
 603                 }
 604 #endif /* DEBUG */
 605
 606                 /* Mac-Manipulation 2 get seed1 */
 607                 tst1=0;
 608                 tst2=0;
 609                 for (reg=2; reg<6; reg++) {
 610                         tst1 = tst1 << 8;
 611                         tst1 = tst1 | bi_enetaddr[reg];
 612                 }
 613                 for (reg=0; reg<2; reg++) {
 614                         tst2 = tst2 | bi_enetaddr[reg];
 615                         tst2 = tst2 << 8;
 616                 }
 617
 618                 seed1 = tst1^tst2;
 619
 620                 /* Mirror seed1*/
 621                 m_mask=0x1;
 622                 for (reg=1;reg<=32;reg++) {
 623                         m_value |= (m_mask & seed1);
 624                         seed1 = seed1 >> 1;
 625                         m_value = m_value << 1;
 626                 }
 627                 seed1 = m_value;
 628                 seed2 = 0xB78D0945;
 629         }
 630
 631         /* Random Number Generator */
 632
 633         for (reg=0;reg<=0;reg++) {
 634                 sum = seed1 + seed2;
 635                 if (sum < seed1 || sum < seed2)
 636                         sum++;
 637                 seed2 = seed1;
 638                 seed1 = sum;
 639
 640                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 641                         sum = sum >> (22-BootpTry);
 642                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 643                         sum = sum >> 19;
 644                 }
 645         }
 646
 647         printf ("Random delay: %ld ms...\n", sum);
 648         for (reg=0; reg <sum; reg++) {
 649                 udelay(1000); /*Wait 1ms*/
 650         }
 651 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 652
 653         printf("BOOTP broadcast %d\n", ++BootpTry);
 654         pkt = NetTxPacket;
 655         memset ((void*)pkt, 0, PKTSIZE);
 656
 657         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 658
 659         /*
 660          * Next line results in incorrect packet size being transmitted, resulting
 661          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 662          * set in packet header after extension length has been determined.
 663          * C. Hallinan, DS4.COM, Inc.
 664          */
 665         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 666         iphdr = pkt;    /* We need this later for NetSetIP() */
 667         pkt += IP_HDR_SIZE;
 668
 669         bp = (Bootp_t *)pkt;
 670         bp->bp_op = OP_BOOTREQUEST;
 671         bp->bp_htype = HWT_ETHER;
 672         bp->bp_hlen = HWL_ETHER;
 673         bp->bp_hops = 0;
 674         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 675         NetWriteIP(&bp->bp_ciaddr, 0);
 676         NetWriteIP(&bp->bp_yiaddr, 0);
 677         NetWriteIP(&bp->bp_siaddr, 0);
 678         NetWriteIP(&bp->bp_giaddr, 0);
 679         memcpy (bp->bp_chaddr, NetOurEther, 6);
 680         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 681
 682         /* Request additional information from the BOOTP/DHCP server */
 683 #if defined(CONFIG_CMD_DHCP)
 684         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 685 #else
 686         ext_len = BootpExtended((u8 *)bp->bp_vend);
 687 #endif
 688
 689         /*
 690          *      Bootp ID is the lower 4 bytes of our ethernet address
 691          *      plus the current time in HZ.
 692          */
 693         BootpID = ((ulong)NetOurEther[2] << 24)
 694                 | ((ulong)NetOurEther[3] << 16)
 695                 | ((ulong)NetOurEther[4] << 8)
 696                 | (ulong)NetOurEther[5];
 697         BootpID += get_timer(0);
 698         BootpID  = htonl(BootpID);
 699         NetCopyLong(&bp->bp_id, &BootpID);
 700
 701         /*
 702          * Calculate proper packet lengths taking into account the
 703          * variable size of the options field
 704          */
 705         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + ext_len;
 706         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 707         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 708         NetSetTimeout(SELECT_TIMEOUT * CFG_HZ, BootpTimeout);
 709
 710 #if defined(CONFIG_CMD_DHCP)
 711         dhcp_state = SELECTING;
 712         NetSetHandler(DhcpHandler);
 713 #else
 714         NetSetHandler(BootpHandler);
 715 #endif
 716         NetSendPacket(NetTxPacket, pktlen);
 717 }
 718
 719 #if defined(CONFIG_CMD_DHCP)
 720 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 721 {
 722         uchar *end = popt + BOOTP_HDR_SIZE;
 723         int oplen, size;
 724
 725         while (popt < end && *popt != 0xff) {
 726                 oplen = *(popt + 1);
 727                 switch (*popt) {
 728                 case 1:
 729                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 730                         break;
 731 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 732                 case 2:         /* Time offset  */
 733                         NetCopyLong (&NetTimeOffset, (ulong *) (popt + 2));
 734                         NetTimeOffset = ntohl (NetTimeOffset);
 735                         break;
 736 #endif
 737                 case 3:
 738                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 739                         break;
 740                 case 6:
 741                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 742 #if defined(CONFIG_BOOTP_DNS2)
 743                         if (*(popt + 1) > 4) {
 744                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 745                         }
 746 #endif
 747                         break;
 748                 case 12:
 749                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 750                         memcpy (&NetOurHostName, popt + 2, size);
 751                         NetOurHostName[size] = 0;
 752                         break;
 753                 case 15:        /* Ignore Domain Name Option */
 754                         break;
 755                 case 17:
 756                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 757                         memcpy (&NetOurRootPath, popt + 2, size);
 758                         NetOurRootPath[size] = 0;
 759                         break;
 760 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 761                 case 42:        /* NTP server IP */
 762                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 763                         break;
 764 #endif
 765                 case 51:
 766                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 767                         break;
 768                 case 53:        /* Ignore Message Type Option */
 769                         break;
 770                 case 54:
 771                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 772                         break;
 773                 case 58:        /* Ignore Renewal Time Option */
 774                         break;
 775                 case 59:        /* Ignore Rebinding Time Option */
 776                         break;
 777                 case 66:        /* Ignore TFTP server name */
 778                         break;
 779                 case 67:        /* vendor opt bootfile */
 780                         /*
 781                          * I can't use dhcp_vendorex_proc here because I need
 782                          * to write into the bootp packet - even then I had to
 783                          * pass the bootp packet pointer into here as the
 784                          * second arg
 785                          */
 786                         size = truncate_sz ("Opt Boot File",
 787                                             sizeof(bp->bp_file),
 788                                             oplen);
 789                         if (bp->bp_file[0] == '\0' && size > 0) {
 790                                 /*
 791                                  * only use vendor boot file if we didn't
 792                                  * receive a boot file in the main non-vendor
 793                                  * part of the packet - god only knows why
 794                                  * some vendors chose not to use this perfectly
 795                                  * good spot to store the boot file (join on
 796                                  * Tru64 Unix) it seems mind bogglingly crazy
 797                                  * to me
 798                                  */
 799                                 printf("*** WARNING: using vendor "
 800                                         "optional boot file\n");
 801                                 memcpy(bp->bp_file, popt + 2, size);
 802                                 bp->bp_file[size] = '\0';
 803                         }
 804                         break;
 805                 default:
 806 #if defined(CONFIG_BOOTP_VENDOREX)
 807                         if (dhcp_vendorex_proc (popt))
 808                                 break;
 809 #endif
 810                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 811                         break;
 812                 }
 813                 popt += oplen + 2;      /* Process next option */
 814         }
 815 }
 816
 817 static int DhcpMessageType(unsigned char *popt)
 818 {
 819         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 820                 return -1;
 821
 822         popt += 4;
 823         while ( *popt != 0xff ) {
 824                 if ( *popt == 53 )      /* DHCP Message Type */
 825                         return *(popt + 2);
 826                 popt += *(popt + 1) + 2;        /* Scan through all options */
 827         }
 828         return -1;
 829 }
 830
 831 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 832 {
 833         volatile uchar *pkt, *iphdr;
 834         Bootp_t *bp;
 835         int pktlen, iplen, extlen;
 836         IPaddr_t OfferedIP;
 837
 838         debug ("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 839         pkt = NetTxPacket;
 840         memset ((void*)pkt, 0, PKTSIZE);
 841
 842         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 843
 844         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 845         pkt += IP_HDR_SIZE;
 846
 847         bp = (Bootp_t *)pkt;
 848         bp->bp_op = OP_BOOTREQUEST;
 849         bp->bp_htype = HWT_ETHER;
 850         bp->bp_hlen = HWL_ETHER;
 851         bp->bp_hops = 0;
 852         bp->bp_secs = htons(get_timer(0) / CFG_HZ);
 853         NetCopyIP(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
 854         NetCopyIP(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
 855         NetCopyIP(&bp->bp_siaddr, &bp_offer->bp_siaddr);
 856         /*
 857          * RFC3046 requires Relay Agents to discard packets with
 858          * nonzero and offered giaddr
 859          */
 860         NetWriteIP(&bp->bp_giaddr, 0);
 861
 862         memcpy (bp->bp_chaddr, NetOurEther, 6);
 863
 864         /*
 865          * ID is the id of the OFFER packet
 866          */
 867
 868         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 869
 870         /*
 871          * Copy options from OFFER packet if present
 872          */
 873         NetCopyIP(&OfferedIP, &bp->bp_yiaddr);
 874         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 875
 876         pktlen = BOOTP_SIZE - sizeof(bp->bp_vend) + extlen;
 877         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 878         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 879
 880         debug ("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 881         NetSendPacket(NetTxPacket, pktlen);
 882 }
 883
 884 /*
 885  *      Handle DHCP received packets.
 886  */
 887 static void
 888 DhcpHandler(uchar * pkt, unsigned dest, unsigned src, unsigned len)
 889 {
 890         Bootp_t *bp = (Bootp_t *)pkt;
 891
 892         debug ("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 893                 src, dest, len, dhcp_state);
 894
 895         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 896                 return;
 897
 898         debug ("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 899                 src, dest, len, dhcp_state);
 900
 901         switch (dhcp_state) {
 902         case SELECTING:
 903                 /*
 904                  * Wait an appropriate time for any potential DHCPOFFER packets
 905                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 906                  * If filename is in format we recognize, assume it is a valid
 907                  * OFFER from a server we want.
 908                  */
 909                 debug ("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 910 #ifdef CFG_BOOTFILE_PREFIX
 911                 if (strncmp(bp->bp_file,
 912                             CFG_BOOTFILE_PREFIX,
 913                             strlen(CFG_BOOTFILE_PREFIX)) == 0 ) {
 914 #endif  /* CFG_BOOTFILE_PREFIX */
 915
 916                         debug ("TRANSITIONING TO REQUESTING STATE\n");
 917                         dhcp_state = REQUESTING;
 918
 919                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 920                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 921
 922                         BootpCopyNetParams(bp); /* Store net params from reply */
 923
 924                         NetSetTimeout(TIMEOUT * CFG_HZ, BootpTimeout);
 925                         DhcpSendRequestPkt(bp);
 926 #ifdef CFG_BOOTFILE_PREFIX
 927                 }
 928 #endif  /* CFG_BOOTFILE_PREFIX */
 929
 930                 return;
 931                 break;
 932         case REQUESTING:
 933                 debug ("DHCP State: REQUESTING\n");
 934
 935                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 936                         char *s;
 937
 938                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 939                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 940                         BootpCopyNetParams(bp); /* Store net params from reply */
 941                         dhcp_state = BOUND;
 942                         puts ("DHCP client bound to address ");
 943                         print_IPaddr(NetOurIP);
 944                         putc ('\n');
 945
 946                         /* Obey the 'autoload' setting */
 947                         if ((s = getenv("autoload")) != NULL) {
 948                                 if (*s == 'n') {
 949                                         /*
 950                                          * Just use BOOTP to configure system;
 951                                          * Do not use TFTP to load the bootfile.
 952                                          */
 953                                         NetState = NETLOOP_SUCCESS;
 954                                         return;
 955 #if defined(CONFIG_CMD_NFS)
 956                                 } else if (strcmp(s, "NFS") == 0) {
 957                                         /*
 958                                          * Use NFS to load the bootfile.
 959                                          */
 960                                         NfsStart();
 961                                         return;
 962 #endif
 963                                 }
 964                         }
 965                         TftpStart();
 966                         return;
 967                 }
 968                 break;
 969         default:
 970                 puts ("DHCP: INVALID STATE\n");
 971                 break;
 972         }
 973
 974 }
 975
 976 void DhcpRequest(void)
 977 {
 978         BootpRequest();
 979 }
 980 #endif
 981
 982 #endif