net/bootp.c

   1 /*
   2  *      Based on LiMon - BOOTP.
   3  *
   4  *      Copyright 1994, 1995, 2000 Neil Russell.
   5  *      (See License)
   6  *      Copyright 2000 Roland Borde
   7  *      Copyright 2000 Paolo Scaffardi
   8  *      Copyright 2000-2004 Wolfgang Denk, wd@denx.de
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13 #include <net.h>
  14 #include "bootp.h"
  15 #include "tftp.h"
  16 #include "nfs.h"
  17 #ifdef CONFIG_STATUS_LED
  18 #include <status_led.h>
  19 #endif
  20
  21 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  22
  23 #define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  24 #ifndef CONFIG_NET_RETRY_COUNT
  25 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  26 #else
  27 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  28 #endif
  29
  30 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  31 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  32
  33 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  34 #define CONFIG_DHCP_MIN_EXT_LEN 64
  35 #endif
  36
  37 ulong           BootpID;
  38 int             BootpTry;
  39 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  40 ulong           seed1, seed2;
  41 #endif
  42
  43 #if defined(CONFIG_CMD_DHCP)
  44 dhcp_state_t dhcp_state = INIT;
  45 unsigned long dhcp_leasetime = 0;
  46 IPaddr_t NetDHCPServerIP = 0;
  47 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  48                         unsigned len);
  49
  50 /* For Debug */
  51 #if 0
  52 static char *dhcpmsg2str(int type)
  53 {
  54         switch (type) {
  55         case 1:  return "DHCPDISCOVER"; break;
  56         case 2:  return "DHCPOFFER";    break;
  57         case 3:  return "DHCPREQUEST";  break;
  58         case 4:  return "DHCPDECLINE";  break;
  59         case 5:  return "DHCPACK";      break;
  60         case 6:  return "DHCPNACK";     break;
  61         case 7:  return "DHCPRELEASE";  break;
  62         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  63         }
  64 }
  65 #endif
  66
  67 #if defined(CONFIG_BOOTP_VENDOREX)
  68 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  69 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  70 #endif
  71
  72 #endif
  73
  74 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  75 {
  76         Bootp_t *bp = (Bootp_t *) pkt;
  77         int retval = 0;
  78
  79         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  80                 retval = -1;
  81         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  82                 retval = -2;
  83         else if (bp->bp_op != OP_BOOTREQUEST &&
  84             bp->bp_op != OP_BOOTREPLY &&
  85             bp->bp_op != DHCP_OFFER &&
  86             bp->bp_op != DHCP_ACK &&
  87             bp->bp_op != DHCP_NAK ) {
  88                 retval = -3;
  89         }
  90         else if (bp->bp_htype != HWT_ETHER)
  91                 retval = -4;
  92         else if (bp->bp_hlen != HWL_ETHER)
  93                 retval = -5;
  94         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
  95                 retval = -6;
  96         }
  97
  98         debug("Filtering pkt = %d\n", retval);
  99
 100         return retval;
 101 }
 102
 103 /*
 104  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 105  */
 106 static void BootpCopyNetParams(Bootp_t *bp)
 107 {
 108         IPaddr_t tmp_ip;
 109
 110         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 111 #if !defined(CONFIG_BOOTP_SERVERIP)
 112         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 113         if (tmp_ip != 0)
 114                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 115         memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6);
 116 #endif
 117         if (strlen(bp->bp_file) > 0)
 118                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 119
 120         debug("Bootfile: %s\n", BootFile);
 121
 122         /* Propagate to environment:
 123          * don't delete exising entry when BOOTP / DHCP reply does
 124          * not contain a new value
 125          */
 126         if (*BootFile) {
 127                 setenv ("bootfile", BootFile);
 128         }
 129 }
 130
 131 static int truncate_sz (const char *name, int maxlen, int curlen)
 132 {
 133         if (curlen >= maxlen) {
 134                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 135                         name, curlen, maxlen);
 136                 curlen = maxlen - 1;
 137         }
 138         return (curlen);
 139 }
 140
 141 #if !defined(CONFIG_CMD_DHCP)
 142
 143 static void BootpVendorFieldProcess (u8 * ext)
 144 {
 145         int size = *(ext + 1);
 146
 147         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 148                    *(ext + 1));
 149
 150         NetBootFileSize = 0;
 151
 152         switch (*ext) {
 153                 /* Fixed length fields */
 154         case 1:                 /* Subnet mask                                  */
 155                 if (NetOurSubnetMask == 0)
 156                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 157                 break;
 158         case 2:                 /* Time offset - Not yet supported              */
 159                 break;
 160                 /* Variable length fields */
 161         case 3:                 /* Gateways list                                */
 162                 if (NetOurGatewayIP == 0) {
 163                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 164                 }
 165                 break;
 166         case 4:                 /* Time server - Not yet supported              */
 167                 break;
 168         case 5:                 /* IEN-116 name server - Not yet supported      */
 169                 break;
 170         case 6:
 171                 if (NetOurDNSIP == 0) {
 172                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 173                 }
 174 #if defined(CONFIG_BOOTP_DNS2)
 175                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 176                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 177                 }
 178 #endif
 179                 break;
 180         case 7:                 /* Log server - Not yet supported               */
 181                 break;
 182         case 8:                 /* Cookie/Quote server - Not yet supported      */
 183                 break;
 184         case 9:                 /* LPR server - Not yet supported               */
 185                 break;
 186         case 10:                /* Impress server - Not yet supported           */
 187                 break;
 188         case 11:                /* RPL server - Not yet supported               */
 189                 break;
 190         case 12:                /* Host name                                    */
 191                 if (NetOurHostName[0] == 0) {
 192                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 193                         memcpy (&NetOurHostName, ext + 2, size);
 194                         NetOurHostName[size] = 0;
 195                 }
 196                 break;
 197         case 13:                /* Boot file size                               */
 198                 if (size == 2)
 199                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 200                 else if (size == 4)
 201                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 202                 break;
 203         case 14:                /* Merit dump file - Not yet supported          */
 204                 break;
 205         case 15:                /* Domain name - Not yet supported              */
 206                 break;
 207         case 16:                /* Swap server - Not yet supported              */
 208                 break;
 209         case 17:                /* Root path                                    */
 210                 if (NetOurRootPath[0] == 0) {
 211                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 212                         memcpy (&NetOurRootPath, ext + 2, size);
 213                         NetOurRootPath[size] = 0;
 214                 }
 215                 break;
 216         case 18:                /* Extension path - Not yet supported           */
 217                 /*
 218                  * This can be used to send the information of the
 219                  * vendor area in another file that the client can
 220                  * access via TFTP.
 221                  */
 222                 break;
 223                 /* IP host layer fields */
 224         case 40:                /* NIS Domain name                              */
 225                 if (NetOurNISDomain[0] == 0) {
 226                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 227                         memcpy (&NetOurNISDomain, ext + 2, size);
 228                         NetOurNISDomain[size] = 0;
 229                 }
 230                 break;
 231 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 232         case 42:        /* NTP server IP */
 233                 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2));
 234                 break;
 235 #endif
 236                 /* Application layer fields */
 237         case 43:                /* Vendor specific info - Not yet supported     */
 238                 /*
 239                  * Binary information to exchange specific
 240                  * product information.
 241                  */
 242                 break;
 243                 /* Reserved (custom) fields (128..254) */
 244         }
 245 }
 246
 247 static void BootpVendorProcess (u8 * ext, int size)
 248 {
 249         u8 *end = ext + size;
 250
 251         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 252
 253         while ((ext < end) && (*ext != 0xff)) {
 254                 if (*ext == 0) {
 255                         ext++;
 256                 } else {
 257                         u8 *opt = ext;
 258
 259                         ext += ext[1] + 2;
 260                         if (ext <= end)
 261                                 BootpVendorFieldProcess (opt);
 262                 }
 263         }
 264
 265         debug("[BOOTP] Received fields: \n");
 266         if (NetOurSubnetMask)
 267                 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
 268
 269         if (NetOurGatewayIP)
 270                 debug("NetOurGatewayIP  : %pI4", &NetOurGatewayIP);
 271
 272         if (NetBootFileSize)
 273                 debug("NetBootFileSize : %d\n", NetBootFileSize);
 274
 275         if (NetOurHostName[0])
 276                 debug("NetOurHostName  : %s\n", NetOurHostName);
 277
 278         if (NetOurRootPath[0])
 279                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
 280
 281         if (NetOurNISDomain[0])
 282                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
 283
 284         if (NetBootFileSize)
 285                 debug("NetBootFileSize: %d\n", NetBootFileSize);
 286
 287 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 288         if (NetNtpServerIP)
 289                 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP);
 290 #endif
 291 }
 292 /*
 293  *      Handle a BOOTP received packet.
 294  */
 295 static void
 296 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 297              unsigned len)
 298 {
 299         Bootp_t *bp;
 300         char    *s;
 301
 302         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 303                 src, dest, len, sizeof (Bootp_t));
 304
 305         bp = (Bootp_t *)pkt;
 306
 307         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 308                 return;
 309
 310         /*
 311          *      Got a good BOOTP reply.  Copy the data into our variables.
 312          */
 313 #ifdef CONFIG_STATUS_LED
 314         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 315 #endif
 316
 317         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 318
 319         /* Retrieve extended information (we must parse the vendor area) */
 320         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 321                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 322
 323         NetSetTimeout(0, (thand_f *)0);
 324
 325         debug("Got good BOOTP\n");
 326
 327         if ((s = getenv("autoload")) != NULL) {
 328                 if (*s == 'n') {
 329                         /*
 330                          * Just use BOOTP to configure system;
 331                          * Do not use TFTP to load the bootfile.
 332                          */
 333                         NetState = NETLOOP_SUCCESS;
 334                         return;
 335 #if defined(CONFIG_CMD_NFS)
 336                 } else if (strcmp(s, "NFS") == 0) {
 337                         /*
 338                          * Use NFS to load the bootfile.
 339                          */
 340                         NfsStart();
 341                         return;
 342 #endif
 343                 }
 344         }
 345
 346         TftpStart();
 347 }
 348 #endif
 349
 350 /*
 351  *      Timeout on BOOTP/DHCP request.
 352  */
 353 static void
 354 BootpTimeout(void)
 355 {
 356         if (BootpTry >= TIMEOUT_COUNT) {
 357                 puts ("\nRetry count exceeded; starting again\n");
 358                 NetStartAgain ();
 359         } else {
 360                 NetSetTimeout (TIMEOUT, BootpTimeout);
 361                 BootpRequest ();
 362         }
 363 }
 364
 365 /*
 366  *      Initialize BOOTP extension fields in the request.
 367  */
 368 #if defined(CONFIG_CMD_DHCP)
 369 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 370 {
 371         u8 *start = e;
 372         u8 *cnt;
 373
 374 #if defined(CONFIG_BOOTP_VENDOREX)
 375         u8 *x;
 376 #endif
 377 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 378         char *hostname;
 379 #endif
 380
 381         *e++ = 99;              /* RFC1048 Magic Cookie */
 382         *e++ = 130;
 383         *e++ = 83;
 384         *e++ = 99;
 385
 386         *e++ = 53;              /* DHCP Message Type */
 387         *e++ = 1;
 388         *e++ = message_type;
 389
 390         *e++ = 57;              /* Maximum DHCP Message Size */
 391         *e++ = 2;
 392         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 393         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 394
 395         if (ServerID) {
 396                 int tmp = ntohl (ServerID);
 397
 398                 *e++ = 54;      /* ServerID */
 399                 *e++ = 4;
 400                 *e++ = tmp >> 24;
 401                 *e++ = tmp >> 16;
 402                 *e++ = tmp >> 8;
 403                 *e++ = tmp & 0xff;
 404         }
 405
 406         if (RequestedIP) {
 407                 int tmp = ntohl (RequestedIP);
 408
 409                 *e++ = 50;      /* Requested IP */
 410                 *e++ = 4;
 411                 *e++ = tmp >> 24;
 412                 *e++ = tmp >> 16;
 413                 *e++ = tmp >> 8;
 414                 *e++ = tmp & 0xff;
 415         }
 416 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 417         if ((hostname = getenv ("hostname"))) {
 418                 int hostnamelen = strlen (hostname);
 419
 420                 *e++ = 12;      /* Hostname */
 421                 *e++ = hostnamelen;
 422                 memcpy (e, hostname, hostnamelen);
 423                 e += hostnamelen;
 424         }
 425 #endif
 426
 427 #if defined(CONFIG_BOOTP_VENDOREX)
 428         if ((x = dhcp_vendorex_prep (e)))
 429                 return x - start;
 430 #endif
 431
 432         *e++ = 55;              /* Parameter Request List */
 433          cnt = e++;             /* Pointer to count of requested items */
 434         *cnt = 0;
 435 #if defined(CONFIG_BOOTP_SUBNETMASK)
 436         *e++  = 1;              /* Subnet Mask */
 437         *cnt += 1;
 438 #endif
 439 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 440         *e++  = 2;
 441         *cnt += 1;
 442 #endif
 443 #if defined(CONFIG_BOOTP_GATEWAY)
 444         *e++  = 3;              /* Router Option */
 445         *cnt += 1;
 446 #endif
 447 #if defined(CONFIG_BOOTP_DNS)
 448         *e++  = 6;              /* DNS Server(s) */
 449         *cnt += 1;
 450 #endif
 451 #if defined(CONFIG_BOOTP_HOSTNAME)
 452         *e++  = 12;             /* Hostname */
 453         *cnt += 1;
 454 #endif
 455 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 456         *e++  = 13;             /* Boot File Size */
 457         *cnt += 1;
 458 #endif
 459 #if defined(CONFIG_BOOTP_BOOTPATH)
 460         *e++  = 17;             /* Boot path */
 461         *cnt += 1;
 462 #endif
 463 #if defined(CONFIG_BOOTP_NISDOMAIN)
 464         *e++  = 40;             /* NIS Domain name request */
 465         *cnt += 1;
 466 #endif
 467 #if defined(CONFIG_BOOTP_NTPSERVER)
 468         *e++  = 42;
 469         *cnt += 1;
 470 #endif
 471         /* no options, so back up to avoid sending an empty request list */
 472         if (*cnt == 0)
 473                 e -= 2;
 474
 475         *e++  = 255;            /* End of the list */
 476
 477         /* Pad to minimal length */
 478 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 479         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 480                 *e++ = 0;
 481 #endif
 482
 483         return e - start;
 484 }
 485
 486 #else
 487 /*
 488  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 489  */
 490 static int BootpExtended (u8 * e)
 491 {
 492         u8 *start = e;
 493
 494         *e++ = 99;              /* RFC1048 Magic Cookie */
 495         *e++ = 130;
 496         *e++ = 83;
 497         *e++ = 99;
 498
 499 #if defined(CONFIG_CMD_DHCP)
 500         *e++ = 53;              /* DHCP Message Type */
 501         *e++ = 1;
 502         *e++ = DHCP_DISCOVER;
 503
 504         *e++ = 57;              /* Maximum DHCP Message Size */
 505         *e++ = 2;
 506         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 507         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 508 #endif
 509
 510 #if defined(CONFIG_BOOTP_SUBNETMASK)
 511         *e++ = 1;               /* Subnet mask request */
 512         *e++ = 4;
 513         e   += 4;
 514 #endif
 515
 516 #if defined(CONFIG_BOOTP_GATEWAY)
 517         *e++ = 3;               /* Default gateway request */
 518         *e++ = 4;
 519         e   += 4;
 520 #endif
 521
 522 #if defined(CONFIG_BOOTP_DNS)
 523         *e++ = 6;               /* Domain Name Server */
 524         *e++ = 4;
 525         e   += 4;
 526 #endif
 527
 528 #if defined(CONFIG_BOOTP_HOSTNAME)
 529         *e++ = 12;              /* Host name request */
 530         *e++ = 32;
 531         e   += 32;
 532 #endif
 533
 534 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 535         *e++ = 13;              /* Boot file size */
 536         *e++ = 2;
 537         e   += 2;
 538 #endif
 539
 540 #if defined(CONFIG_BOOTP_BOOTPATH)
 541         *e++ = 17;              /* Boot path */
 542         *e++ = 32;
 543         e   += 32;
 544 #endif
 545
 546 #if defined(CONFIG_BOOTP_NISDOMAIN)
 547         *e++ = 40;              /* NIS Domain name request */
 548         *e++ = 32;
 549         e   += 32;
 550 #endif
 551 #if defined(CONFIG_BOOTP_NTPSERVER)
 552         *e++ = 42;
 553         *e++ = 4;
 554         e   += 4;
 555 #endif
 556
 557         *e++ = 255;             /* End of the list */
 558
 559         return e - start;
 560 }
 561 #endif
 562
 563 void
 564 BootpRequest (void)
 565 {
 566         volatile uchar *pkt, *iphdr;
 567         Bootp_t *bp;
 568         int ext_len, pktlen, iplen;
 569
 570 #if defined(CONFIG_CMD_DHCP)
 571         dhcp_state = INIT;
 572 #endif
 573
 574 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 575         unsigned char bi_enetaddr[6];
 576         int   reg;
 577         ulong tst1, tst2, sum, m_mask, m_value = 0;
 578
 579         if (BootpTry ==0) {
 580                 /* get our mac */
 581                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 582
 583                 debug("BootpRequest => Our Mac: ");
 584                 for (reg=0; reg<6; reg++)
 585                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 586
 587                 /* Mac-Manipulation 2 get seed1 */
 588                 tst1=0;
 589                 tst2=0;
 590                 for (reg=2; reg<6; reg++) {
 591                         tst1 = tst1 << 8;
 592                         tst1 = tst1 | bi_enetaddr[reg];
 593                 }
 594                 for (reg=0; reg<2; reg++) {
 595                         tst2 = tst2 | bi_enetaddr[reg];
 596                         tst2 = tst2 << 8;
 597                 }
 598
 599                 seed1 = tst1^tst2;
 600
 601                 /* Mirror seed1*/
 602                 m_mask=0x1;
 603                 for (reg=1;reg<=32;reg++) {
 604                         m_value |= (m_mask & seed1);
 605                         seed1 = seed1 >> 1;
 606                         m_value = m_value << 1;
 607                 }
 608                 seed1 = m_value;
 609                 seed2 = 0xB78D0945;
 610         }
 611
 612         /* Random Number Generator */
 613
 614         for (reg=0;reg<=0;reg++) {
 615                 sum = seed1 + seed2;
 616                 if (sum < seed1 || sum < seed2)
 617                         sum++;
 618                 seed2 = seed1;
 619                 seed1 = sum;
 620
 621                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 622                         sum = sum >> (22-BootpTry);
 623                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 624                         sum = sum >> 19;
 625                 }
 626         }
 627
 628         printf ("Random delay: %ld ms...\n", sum);
 629         for (reg=0; reg <sum; reg++) {
 630                 udelay(1000); /*Wait 1ms*/
 631         }
 632 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 633
 634         printf("BOOTP broadcast %d\n", ++BootpTry);
 635         pkt = NetTxPacket;
 636         memset ((void*)pkt, 0, PKTSIZE);
 637
 638         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 639
 640         /*
 641          * Next line results in incorrect packet size being transmitted, resulting
 642          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 643          * set in packet header after extension length has been determined.
 644          * C. Hallinan, DS4.COM, Inc.
 645          */
 646         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 647         iphdr = pkt;    /* We need this later for NetSetIP() */
 648         pkt += IP_HDR_SIZE;
 649
 650         bp = (Bootp_t *)pkt;
 651         bp->bp_op = OP_BOOTREQUEST;
 652         bp->bp_htype = HWT_ETHER;
 653         bp->bp_hlen = HWL_ETHER;
 654         bp->bp_hops = 0;
 655         bp->bp_secs = htons(get_timer(0) / 1000);
 656         NetWriteIP(&bp->bp_ciaddr, 0);
 657         NetWriteIP(&bp->bp_yiaddr, 0);
 658         NetWriteIP(&bp->bp_siaddr, 0);
 659         NetWriteIP(&bp->bp_giaddr, 0);
 660         memcpy (bp->bp_chaddr, NetOurEther, 6);
 661         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 662
 663         /* Request additional information from the BOOTP/DHCP server */
 664 #if defined(CONFIG_CMD_DHCP)
 665         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 666 #else
 667         ext_len = BootpExtended((u8 *)bp->bp_vend);
 668 #endif
 669
 670         /*
 671          *      Bootp ID is the lower 4 bytes of our ethernet address
 672          *      plus the current time in ms.
 673          */
 674         BootpID = ((ulong)NetOurEther[2] << 24)
 675                 | ((ulong)NetOurEther[3] << 16)
 676                 | ((ulong)NetOurEther[4] << 8)
 677                 | (ulong)NetOurEther[5];
 678         BootpID += get_timer(0);
 679         BootpID  = htonl(BootpID);
 680         NetCopyLong(&bp->bp_id, &BootpID);
 681
 682         /*
 683          * Calculate proper packet lengths taking into account the
 684          * variable size of the options field
 685          */
 686         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 687         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 688         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 689         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 690
 691 #if defined(CONFIG_CMD_DHCP)
 692         dhcp_state = SELECTING;
 693         NetSetHandler(DhcpHandler);
 694 #else
 695         NetSetHandler(BootpHandler);
 696 #endif
 697         NetSendPacket(NetTxPacket, pktlen);
 698 }
 699
 700 #if defined(CONFIG_CMD_DHCP)
 701 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 702 {
 703         uchar *end = popt + BOOTP_HDR_SIZE;
 704         int oplen, size;
 705 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 706         int *to_ptr;
 707 #endif
 708
 709         while (popt < end && *popt != 0xff) {
 710                 oplen = *(popt + 1);
 711                 switch (*popt) {
 712                 case 1:
 713                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 714                         break;
 715 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 716                 case 2:         /* Time offset  */
 717                         to_ptr = &NetTimeOffset;
 718                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 719                         NetTimeOffset = ntohl (NetTimeOffset);
 720                         break;
 721 #endif
 722                 case 3:
 723                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 724                         break;
 725                 case 6:
 726                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 727 #if defined(CONFIG_BOOTP_DNS2)
 728                         if (*(popt + 1) > 4) {
 729                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 730                         }
 731 #endif
 732                         break;
 733                 case 12:
 734                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 735                         memcpy (&NetOurHostName, popt + 2, size);
 736                         NetOurHostName[size] = 0;
 737                         break;
 738                 case 15:        /* Ignore Domain Name Option */
 739                         break;
 740                 case 17:
 741                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 742                         memcpy (&NetOurRootPath, popt + 2, size);
 743                         NetOurRootPath[size] = 0;
 744                         break;
 745 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 746                 case 42:        /* NTP server IP */
 747                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 748                         break;
 749 #endif
 750                 case 51:
 751                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 752                         break;
 753                 case 53:        /* Ignore Message Type Option */
 754                         break;
 755                 case 54:
 756                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 757                         break;
 758                 case 58:        /* Ignore Renewal Time Option */
 759                         break;
 760                 case 59:        /* Ignore Rebinding Time Option */
 761                         break;
 762                 case 66:        /* Ignore TFTP server name */
 763                         break;
 764                 case 67:        /* vendor opt bootfile */
 765                         /*
 766                          * I can't use dhcp_vendorex_proc here because I need
 767                          * to write into the bootp packet - even then I had to
 768                          * pass the bootp packet pointer into here as the
 769                          * second arg
 770                          */
 771                         size = truncate_sz ("Opt Boot File",
 772                                             sizeof(bp->bp_file),
 773                                             oplen);
 774                         if (bp->bp_file[0] == '\0' && size > 0) {
 775                                 /*
 776                                  * only use vendor boot file if we didn't
 777                                  * receive a boot file in the main non-vendor
 778                                  * part of the packet - god only knows why
 779                                  * some vendors chose not to use this perfectly
 780                                  * good spot to store the boot file (join on
 781                                  * Tru64 Unix) it seems mind bogglingly crazy
 782                                  * to me
 783                                  */
 784                                 printf("*** WARNING: using vendor "
 785                                         "optional boot file\n");
 786                                 memcpy(bp->bp_file, popt + 2, size);
 787                                 bp->bp_file[size] = '\0';
 788                         }
 789                         break;
 790                 default:
 791 #if defined(CONFIG_BOOTP_VENDOREX)
 792                         if (dhcp_vendorex_proc (popt))
 793                                 break;
 794 #endif
 795                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 796                         break;
 797                 }
 798                 popt += oplen + 2;      /* Process next option */
 799         }
 800 }
 801
 802 static int DhcpMessageType(unsigned char *popt)
 803 {
 804         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 805                 return -1;
 806
 807         popt += 4;
 808         while ( *popt != 0xff ) {
 809                 if ( *popt == 53 )      /* DHCP Message Type */
 810                         return *(popt + 2);
 811                 popt += *(popt + 1) + 2;        /* Scan through all options */
 812         }
 813         return -1;
 814 }
 815
 816 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 817 {
 818         volatile uchar *pkt, *iphdr;
 819         Bootp_t *bp;
 820         int pktlen, iplen, extlen;
 821         IPaddr_t OfferedIP;
 822
 823         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 824         pkt = NetTxPacket;
 825         memset ((void*)pkt, 0, PKTSIZE);
 826
 827         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 828
 829         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 830         pkt += IP_HDR_SIZE;
 831
 832         bp = (Bootp_t *)pkt;
 833         bp->bp_op = OP_BOOTREQUEST;
 834         bp->bp_htype = HWT_ETHER;
 835         bp->bp_hlen = HWL_ETHER;
 836         bp->bp_hops = 0;
 837         bp->bp_secs = htons(get_timer(0) / 1000);
 838         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 839          * the server yet */
 840
 841         /*
 842          * RFC3046 requires Relay Agents to discard packets with
 843          * nonzero and offered giaddr
 844          */
 845         NetWriteIP(&bp->bp_giaddr, 0);
 846
 847         memcpy (bp->bp_chaddr, NetOurEther, 6);
 848
 849         /*
 850          * ID is the id of the OFFER packet
 851          */
 852
 853         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 854
 855         /*
 856          * Copy options from OFFER packet if present
 857          */
 858
 859         /* Copy offered IP into the parameters request list */
 860         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 861         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 862
 863         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 864         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 865         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 866
 867         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 868 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 869         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 870 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 871         NetSendPacket(NetTxPacket, pktlen);
 872 }
 873
 874 /*
 875  *      Handle DHCP received packets.
 876  */
 877 static void
 878 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 879             unsigned len)
 880 {
 881         Bootp_t *bp = (Bootp_t *)pkt;
 882
 883         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 884                 src, dest, len, dhcp_state);
 885
 886         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 887                 return;
 888
 889         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 890                 src, dest, len, dhcp_state);
 891
 892         switch (dhcp_state) {
 893         case SELECTING:
 894                 /*
 895                  * Wait an appropriate time for any potential DHCPOFFER packets
 896                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 897                  * If filename is in format we recognize, assume it is a valid
 898                  * OFFER from a server we want.
 899                  */
 900                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 901 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 902                 if (strncmp(bp->bp_file,
 903                             CONFIG_SYS_BOOTFILE_PREFIX,
 904                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 905 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 906
 907                         debug("TRANSITIONING TO REQUESTING STATE\n");
 908                         dhcp_state = REQUESTING;
 909
 910                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 911                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 912
 913                         NetSetTimeout(TIMEOUT, BootpTimeout);
 914                         DhcpSendRequestPkt(bp);
 915 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 916                 }
 917 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 918
 919                 return;
 920                 break;
 921         case REQUESTING:
 922                 debug("DHCP State: REQUESTING\n");
 923
 924                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 925                         char *s;
 926
 927                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 928                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 929                         BootpCopyNetParams(bp); /* Store net params from reply */
 930                         dhcp_state = BOUND;
 931                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 932
 933                         /* Obey the 'autoload' setting */
 934                         if ((s = getenv("autoload")) != NULL) {
 935                                 if (*s == 'n') {
 936                                         /*
 937                                          * Just use BOOTP to configure system;
 938                                          * Do not use TFTP to load the bootfile.
 939                                          */
 940                                         NetState = NETLOOP_SUCCESS;
 941                                         return;
 942 #if defined(CONFIG_CMD_NFS)
 943                                 } else if (strcmp(s, "NFS") == 0) {
 944                                         /*
 945                                          * Use NFS to load the bootfile.
 946                                          */
 947                                         NfsStart();
 948                                         return;
 949 #endif
 950                                 }
 951                         }
 952                         TftpStart();
 953                         return;
 954                 }
 955                 break;
 956         case BOUND:
 957                 /* DHCP client bound to address */
 958                 break;
 959         default:
 960                 puts ("DHCP: INVALID STATE\n");
 961                 break;
 962         }
 963
 964 }
 965
 966 void DhcpRequest(void)
 967 {
 968         BootpRequest();
 969 }
 970 #endif  /* CONFIG_CMD_DHCP */