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 #include <linux/compiler.h>
  21
  22 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie         */
  23
  24 #define TIMEOUT         5000UL  /* Milliseconds before trying BOOTP again */
  25 #ifndef CONFIG_NET_RETRY_COUNT
  26 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up  */
  27 #else
  28 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  29 #endif
  30
  31 #define PORT_BOOTPS     67              /* BOOTP server UDP port                */
  32 #define PORT_BOOTPC     68              /* BOOTP client UDP port                */
  33
  34 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list     */
  35 #define CONFIG_DHCP_MIN_EXT_LEN 64
  36 #endif
  37
  38 ulong           BootpID;
  39 int             BootpTry;
  40 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  41 ulong           seed1, seed2;
  42 #endif
  43
  44 #if defined(CONFIG_CMD_DHCP)
  45 dhcp_state_t dhcp_state = INIT;
  46 unsigned long dhcp_leasetime = 0;
  47 IPaddr_t NetDHCPServerIP = 0;
  48 static void DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
  49                         unsigned len);
  50
  51 /* For Debug */
  52 #if 0
  53 static char *dhcpmsg2str(int type)
  54 {
  55         switch (type) {
  56         case 1:  return "DHCPDISCOVER"; break;
  57         case 2:  return "DHCPOFFER";    break;
  58         case 3:  return "DHCPREQUEST";  break;
  59         case 4:  return "DHCPDECLINE";  break;
  60         case 5:  return "DHCPACK";      break;
  61         case 6:  return "DHCPNACK";     break;
  62         case 7:  return "DHCPRELEASE";  break;
  63         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  64         }
  65 }
  66 #endif
  67
  68 #if defined(CONFIG_BOOTP_VENDOREX)
  69 extern u8 *dhcp_vendorex_prep (u8 *e); /*rtn new e after add own opts. */
  70 extern u8 *dhcp_vendorex_proc (u8 *e); /*rtn next e if mine,else NULL  */
  71 #endif
  72
  73 #endif
  74
  75 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
  76 {
  77         Bootp_t *bp = (Bootp_t *) pkt;
  78         int retval = 0;
  79
  80         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
  81                 retval = -1;
  82         else if (len < sizeof (Bootp_t) - OPT_SIZE)
  83                 retval = -2;
  84         else if (bp->bp_op != OP_BOOTREQUEST &&
  85             bp->bp_op != OP_BOOTREPLY &&
  86             bp->bp_op != DHCP_OFFER &&
  87             bp->bp_op != DHCP_ACK &&
  88             bp->bp_op != DHCP_NAK ) {
  89                 retval = -3;
  90         }
  91         else if (bp->bp_htype != HWT_ETHER)
  92                 retval = -4;
  93         else if (bp->bp_hlen != HWL_ETHER)
  94                 retval = -5;
  95         else if (NetReadLong((ulong*)&bp->bp_id) != BootpID) {
  96                 retval = -6;
  97         }
  98
  99         debug("Filtering pkt = %d\n", retval);
 100
 101         return retval;
 102 }
 103
 104 /*
 105  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 106  */
 107 static void BootpCopyNetParams(Bootp_t *bp)
 108 {
 109         __maybe_unused IPaddr_t tmp_ip;
 110
 111         NetCopyIP(&NetOurIP, &bp->bp_yiaddr);
 112 #if !defined(CONFIG_BOOTP_SERVERIP)
 113         NetCopyIP(&tmp_ip, &bp->bp_siaddr);
 114         if (tmp_ip != 0)
 115                 NetCopyIP(&NetServerIP, &bp->bp_siaddr);
 116         memcpy (NetServerEther, ((Ethernet_t *)NetRxPacket)->et_src, 6);
 117 #endif
 118         if (strlen(bp->bp_file) > 0)
 119                 copy_filename (BootFile, bp->bp_file, sizeof(BootFile));
 120
 121         debug("Bootfile: %s\n", BootFile);
 122
 123         /* Propagate to environment:
 124          * don't delete exising entry when BOOTP / DHCP reply does
 125          * not contain a new value
 126          */
 127         if (*BootFile) {
 128                 setenv ("bootfile", BootFile);
 129         }
 130 }
 131
 132 static int truncate_sz (const char *name, int maxlen, int curlen)
 133 {
 134         if (curlen >= maxlen) {
 135                 printf("*** WARNING: %s is too long (%d - max: %d) - truncated\n",
 136                         name, curlen, maxlen);
 137                 curlen = maxlen - 1;
 138         }
 139         return (curlen);
 140 }
 141
 142 #if !defined(CONFIG_CMD_DHCP)
 143
 144 static void BootpVendorFieldProcess (u8 * ext)
 145 {
 146         int size = *(ext + 1);
 147
 148         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 149                    *(ext + 1));
 150
 151         NetBootFileSize = 0;
 152
 153         switch (*ext) {
 154                 /* Fixed length fields */
 155         case 1:                 /* Subnet mask                                  */
 156                 if (NetOurSubnetMask == 0)
 157                         NetCopyIP (&NetOurSubnetMask, (IPaddr_t *) (ext + 2));
 158                 break;
 159         case 2:                 /* Time offset - Not yet supported              */
 160                 break;
 161                 /* Variable length fields */
 162         case 3:                 /* Gateways list                                */
 163                 if (NetOurGatewayIP == 0) {
 164                         NetCopyIP (&NetOurGatewayIP, (IPaddr_t *) (ext + 2));
 165                 }
 166                 break;
 167         case 4:                 /* Time server - Not yet supported              */
 168                 break;
 169         case 5:                 /* IEN-116 name server - Not yet supported      */
 170                 break;
 171         case 6:
 172                 if (NetOurDNSIP == 0) {
 173                         NetCopyIP (&NetOurDNSIP, (IPaddr_t *) (ext + 2));
 174                 }
 175 #if defined(CONFIG_BOOTP_DNS2)
 176                 if ((NetOurDNS2IP == 0) && (size > 4)) {
 177                         NetCopyIP (&NetOurDNS2IP, (IPaddr_t *) (ext + 2 + 4));
 178                 }
 179 #endif
 180                 break;
 181         case 7:                 /* Log server - Not yet supported               */
 182                 break;
 183         case 8:                 /* Cookie/Quote server - Not yet supported      */
 184                 break;
 185         case 9:                 /* LPR server - Not yet supported               */
 186                 break;
 187         case 10:                /* Impress server - Not yet supported           */
 188                 break;
 189         case 11:                /* RPL server - Not yet supported               */
 190                 break;
 191         case 12:                /* Host name                                    */
 192                 if (NetOurHostName[0] == 0) {
 193                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), size);
 194                         memcpy (&NetOurHostName, ext + 2, size);
 195                         NetOurHostName[size] = 0;
 196                 }
 197                 break;
 198         case 13:                /* Boot file size                               */
 199                 if (size == 2)
 200                         NetBootFileSize = ntohs (*(ushort *) (ext + 2));
 201                 else if (size == 4)
 202                         NetBootFileSize = ntohl (*(ulong *) (ext + 2));
 203                 break;
 204         case 14:                /* Merit dump file - Not yet supported          */
 205                 break;
 206         case 15:                /* Domain name - Not yet supported              */
 207                 break;
 208         case 16:                /* Swap server - Not yet supported              */
 209                 break;
 210         case 17:                /* Root path                                    */
 211                 if (NetOurRootPath[0] == 0) {
 212                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), size);
 213                         memcpy (&NetOurRootPath, ext + 2, size);
 214                         NetOurRootPath[size] = 0;
 215                 }
 216                 break;
 217         case 18:                /* Extension path - Not yet supported           */
 218                 /*
 219                  * This can be used to send the information of the
 220                  * vendor area in another file that the client can
 221                  * access via TFTP.
 222                  */
 223                 break;
 224                 /* IP host layer fields */
 225         case 40:                /* NIS Domain name                              */
 226                 if (NetOurNISDomain[0] == 0) {
 227                         size = truncate_sz ("NIS Domain Name", sizeof (NetOurNISDomain), size);
 228                         memcpy (&NetOurNISDomain, ext + 2, size);
 229                         NetOurNISDomain[size] = 0;
 230                 }
 231                 break;
 232 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 233         case 42:        /* NTP server IP */
 234                 NetCopyIP(&NetNtpServerIP, (IPaddr_t *) (ext + 2));
 235                 break;
 236 #endif
 237                 /* Application layer fields */
 238         case 43:                /* Vendor specific info - Not yet supported     */
 239                 /*
 240                  * Binary information to exchange specific
 241                  * product information.
 242                  */
 243                 break;
 244                 /* Reserved (custom) fields (128..254) */
 245         }
 246 }
 247
 248 static void BootpVendorProcess (u8 * ext, int size)
 249 {
 250         u8 *end = ext + size;
 251
 252         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 253
 254         while ((ext < end) && (*ext != 0xff)) {
 255                 if (*ext == 0) {
 256                         ext++;
 257                 } else {
 258                         u8 *opt = ext;
 259
 260                         ext += ext[1] + 2;
 261                         if (ext <= end)
 262                                 BootpVendorFieldProcess (opt);
 263                 }
 264         }
 265
 266         debug("[BOOTP] Received fields: \n");
 267         if (NetOurSubnetMask)
 268                 debug("NetOurSubnetMask : %pI4\n", &NetOurSubnetMask);
 269
 270         if (NetOurGatewayIP)
 271                 debug("NetOurGatewayIP  : %pI4", &NetOurGatewayIP);
 272
 273         if (NetBootFileSize)
 274                 debug("NetBootFileSize : %d\n", NetBootFileSize);
 275
 276         if (NetOurHostName[0])
 277                 debug("NetOurHostName  : %s\n", NetOurHostName);
 278
 279         if (NetOurRootPath[0])
 280                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
 281
 282         if (NetOurNISDomain[0])
 283                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
 284
 285         if (NetBootFileSize)
 286                 debug("NetBootFileSize: %d\n", NetBootFileSize);
 287
 288 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 289         if (NetNtpServerIP)
 290                 debug("NetNtpServerIP : %pI4\n", &NetNtpServerIP);
 291 #endif
 292 }
 293
 294 /*
 295  *      Handle a BOOTP received packet.
 296  */
 297 static void
 298 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 299              unsigned len)
 300 {
 301         Bootp_t *bp;
 302
 303         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 304                 src, dest, len, sizeof (Bootp_t));
 305
 306         bp = (Bootp_t *)pkt;
 307
 308         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 309                 return;
 310
 311         /*
 312          *      Got a good BOOTP reply.  Copy the data into our variables.
 313          */
 314 #ifdef CONFIG_STATUS_LED
 315         status_led_set (STATUS_LED_BOOT, STATUS_LED_OFF);
 316 #endif
 317
 318         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 319
 320         /* Retrieve extended information (we must parse the vendor area) */
 321         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 322                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 323
 324         NetSetTimeout(0, (thand_f *)0);
 325         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
 326
 327         debug("Got good BOOTP\n");
 328
 329         net_auto_load();
 330 }
 331 #endif
 332
 333 /*
 334  *      Timeout on BOOTP/DHCP request.
 335  */
 336 static void
 337 BootpTimeout(void)
 338 {
 339         if (BootpTry >= TIMEOUT_COUNT) {
 340                 puts ("\nRetry count exceeded; starting again\n");
 341                 NetStartAgain ();
 342         } else {
 343                 NetSetTimeout (TIMEOUT, BootpTimeout);
 344                 BootpRequest ();
 345         }
 346 }
 347
 348 /*
 349  *      Initialize BOOTP extension fields in the request.
 350  */
 351 #if defined(CONFIG_CMD_DHCP)
 352 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 353 {
 354         u8 *start = e;
 355         u8 *cnt;
 356 #if defined(CONFIG_BOOTP_PXE)
 357         char *uuid;
 358         size_t vci_strlen;
 359         u16 clientarch;
 360 #endif
 361
 362 #if defined(CONFIG_BOOTP_VENDOREX)
 363         u8 *x;
 364 #endif
 365 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 366         char *hostname;
 367 #endif
 368
 369         *e++ = 99;              /* RFC1048 Magic Cookie */
 370         *e++ = 130;
 371         *e++ = 83;
 372         *e++ = 99;
 373
 374         *e++ = 53;              /* DHCP Message Type */
 375         *e++ = 1;
 376         *e++ = message_type;
 377
 378         *e++ = 57;              /* Maximum DHCP Message Size */
 379         *e++ = 2;
 380         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 381         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 382
 383         if (ServerID) {
 384                 int tmp = ntohl (ServerID);
 385
 386                 *e++ = 54;      /* ServerID */
 387                 *e++ = 4;
 388                 *e++ = tmp >> 24;
 389                 *e++ = tmp >> 16;
 390                 *e++ = tmp >> 8;
 391                 *e++ = tmp & 0xff;
 392         }
 393
 394         if (RequestedIP) {
 395                 int tmp = ntohl (RequestedIP);
 396
 397                 *e++ = 50;      /* Requested IP */
 398                 *e++ = 4;
 399                 *e++ = tmp >> 24;
 400                 *e++ = tmp >> 16;
 401                 *e++ = tmp >> 8;
 402                 *e++ = tmp & 0xff;
 403         }
 404 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 405         if ((hostname = getenv ("hostname"))) {
 406                 int hostnamelen = strlen (hostname);
 407
 408                 *e++ = 12;      /* Hostname */
 409                 *e++ = hostnamelen;
 410                 memcpy (e, hostname, hostnamelen);
 411                 e += hostnamelen;
 412         }
 413 #endif
 414
 415 #if defined(CONFIG_BOOTP_PXE)
 416         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 417         *e++ = 93;      /* Client System Architecture */
 418         *e++ = 2;
 419         *e++ = (clientarch >> 8) & 0xff;
 420         *e++ = clientarch & 0xff;
 421
 422         *e++ = 94;      /* Client Network Interface Identifier */
 423         *e++ = 3;
 424         *e++ = 1;       /* type field for UNDI */
 425         *e++ = 0;       /* major revision */
 426         *e++ = 0;       /* minor revision */
 427
 428         uuid = getenv("pxeuuid");
 429
 430         if (uuid) {
 431                 if (uuid_str_valid(uuid)) {
 432                         *e++ = 97;      /* Client Machine Identifier */
 433                         *e++ = 17;
 434                         *e++ = 0;       /* type 0 - UUID */
 435
 436                         uuid_str_to_bin(uuid, e);
 437                         e += 16;
 438                 } else {
 439                         printf("Invalid pxeuuid: %s\n", uuid);
 440                 }
 441         }
 442
 443         *e++ = 60;      /* Vendor Class Identifier */
 444         vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING);
 445         *e++ = vci_strlen;
 446         memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen);
 447         e += vci_strlen;
 448 #endif
 449
 450 #if defined(CONFIG_BOOTP_VENDOREX)
 451         if ((x = dhcp_vendorex_prep (e)))
 452                 return x - start;
 453 #endif
 454
 455         *e++ = 55;              /* Parameter Request List */
 456          cnt = e++;             /* Pointer to count of requested items */
 457         *cnt = 0;
 458 #if defined(CONFIG_BOOTP_SUBNETMASK)
 459         *e++  = 1;              /* Subnet Mask */
 460         *cnt += 1;
 461 #endif
 462 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 463         *e++  = 2;
 464         *cnt += 1;
 465 #endif
 466 #if defined(CONFIG_BOOTP_GATEWAY)
 467         *e++  = 3;              /* Router Option */
 468         *cnt += 1;
 469 #endif
 470 #if defined(CONFIG_BOOTP_DNS)
 471         *e++  = 6;              /* DNS Server(s) */
 472         *cnt += 1;
 473 #endif
 474 #if defined(CONFIG_BOOTP_HOSTNAME)
 475         *e++  = 12;             /* Hostname */
 476         *cnt += 1;
 477 #endif
 478 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 479         *e++  = 13;             /* Boot File Size */
 480         *cnt += 1;
 481 #endif
 482 #if defined(CONFIG_BOOTP_BOOTPATH)
 483         *e++  = 17;             /* Boot path */
 484         *cnt += 1;
 485 #endif
 486 #if defined(CONFIG_BOOTP_NISDOMAIN)
 487         *e++  = 40;             /* NIS Domain name request */
 488         *cnt += 1;
 489 #endif
 490 #if defined(CONFIG_BOOTP_NTPSERVER)
 491         *e++  = 42;
 492         *cnt += 1;
 493 #endif
 494         /* no options, so back up to avoid sending an empty request list */
 495         if (*cnt == 0)
 496                 e -= 2;
 497
 498         *e++  = 255;            /* End of the list */
 499
 500         /* Pad to minimal length */
 501 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 502         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 503                 *e++ = 0;
 504 #endif
 505
 506         return e - start;
 507 }
 508
 509 #else
 510 /*
 511  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 512  */
 513 static int BootpExtended (u8 * e)
 514 {
 515         u8 *start = e;
 516
 517         *e++ = 99;              /* RFC1048 Magic Cookie */
 518         *e++ = 130;
 519         *e++ = 83;
 520         *e++ = 99;
 521
 522 #if defined(CONFIG_CMD_DHCP)
 523         *e++ = 53;              /* DHCP Message Type */
 524         *e++ = 1;
 525         *e++ = DHCP_DISCOVER;
 526
 527         *e++ = 57;              /* Maximum DHCP Message Size */
 528         *e++ = 2;
 529         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 530         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 531 #endif
 532
 533 #if defined(CONFIG_BOOTP_SUBNETMASK)
 534         *e++ = 1;               /* Subnet mask request */
 535         *e++ = 4;
 536         e   += 4;
 537 #endif
 538
 539 #if defined(CONFIG_BOOTP_GATEWAY)
 540         *e++ = 3;               /* Default gateway request */
 541         *e++ = 4;
 542         e   += 4;
 543 #endif
 544
 545 #if defined(CONFIG_BOOTP_DNS)
 546         *e++ = 6;               /* Domain Name Server */
 547         *e++ = 4;
 548         e   += 4;
 549 #endif
 550
 551 #if defined(CONFIG_BOOTP_HOSTNAME)
 552         *e++ = 12;              /* Host name request */
 553         *e++ = 32;
 554         e   += 32;
 555 #endif
 556
 557 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 558         *e++ = 13;              /* Boot file size */
 559         *e++ = 2;
 560         e   += 2;
 561 #endif
 562
 563 #if defined(CONFIG_BOOTP_BOOTPATH)
 564         *e++ = 17;              /* Boot path */
 565         *e++ = 32;
 566         e   += 32;
 567 #endif
 568
 569 #if defined(CONFIG_BOOTP_NISDOMAIN)
 570         *e++ = 40;              /* NIS Domain name request */
 571         *e++ = 32;
 572         e   += 32;
 573 #endif
 574 #if defined(CONFIG_BOOTP_NTPSERVER)
 575         *e++ = 42;
 576         *e++ = 4;
 577         e   += 4;
 578 #endif
 579
 580         *e++ = 255;             /* End of the list */
 581
 582         return e - start;
 583 }
 584 #endif
 585
 586 void
 587 BootpRequest (void)
 588 {
 589         volatile uchar *pkt, *iphdr;
 590         Bootp_t *bp;
 591         int ext_len, pktlen, iplen;
 592
 593         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 594 #if defined(CONFIG_CMD_DHCP)
 595         dhcp_state = INIT;
 596 #endif
 597
 598 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 599         unsigned char bi_enetaddr[6];
 600         int   reg;
 601         ulong tst1, tst2, sum, m_mask, m_value = 0;
 602
 603         if (BootpTry ==0) {
 604                 /* get our mac */
 605                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 606
 607                 debug("BootpRequest => Our Mac: ");
 608                 for (reg=0; reg<6; reg++)
 609                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 610
 611                 /* Mac-Manipulation 2 get seed1 */
 612                 tst1=0;
 613                 tst2=0;
 614                 for (reg=2; reg<6; reg++) {
 615                         tst1 = tst1 << 8;
 616                         tst1 = tst1 | bi_enetaddr[reg];
 617                 }
 618                 for (reg=0; reg<2; reg++) {
 619                         tst2 = tst2 | bi_enetaddr[reg];
 620                         tst2 = tst2 << 8;
 621                 }
 622
 623                 seed1 = tst1^tst2;
 624
 625                 /* Mirror seed1*/
 626                 m_mask=0x1;
 627                 for (reg=1;reg<=32;reg++) {
 628                         m_value |= (m_mask & seed1);
 629                         seed1 = seed1 >> 1;
 630                         m_value = m_value << 1;
 631                 }
 632                 seed1 = m_value;
 633                 seed2 = 0xB78D0945;
 634         }
 635
 636         /* Random Number Generator */
 637
 638         for (reg=0;reg<=0;reg++) {
 639                 sum = seed1 + seed2;
 640                 if (sum < seed1 || sum < seed2)
 641                         sum++;
 642                 seed2 = seed1;
 643                 seed1 = sum;
 644
 645                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 646                         sum = sum >> (22-BootpTry);
 647                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 648                         sum = sum >> 19;
 649                 }
 650         }
 651
 652         printf ("Random delay: %ld ms...\n", sum);
 653         for (reg=0; reg <sum; reg++) {
 654                 udelay(1000); /*Wait 1ms*/
 655         }
 656 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 657
 658         printf("BOOTP broadcast %d\n", ++BootpTry);
 659         pkt = NetTxPacket;
 660         memset ((void*)pkt, 0, PKTSIZE);
 661
 662         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 663
 664         /*
 665          * Next line results in incorrect packet size being transmitted, resulting
 666          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 667          * set in packet header after extension length has been determined.
 668          * C. Hallinan, DS4.COM, Inc.
 669          */
 670         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 671         iphdr = pkt;    /* We need this later for NetSetIP() */
 672         pkt += IP_HDR_SIZE;
 673
 674         bp = (Bootp_t *)pkt;
 675         bp->bp_op = OP_BOOTREQUEST;
 676         bp->bp_htype = HWT_ETHER;
 677         bp->bp_hlen = HWL_ETHER;
 678         bp->bp_hops = 0;
 679         bp->bp_secs = htons(get_timer(0) / 1000);
 680         NetWriteIP(&bp->bp_ciaddr, 0);
 681         NetWriteIP(&bp->bp_yiaddr, 0);
 682         NetWriteIP(&bp->bp_siaddr, 0);
 683         NetWriteIP(&bp->bp_giaddr, 0);
 684         memcpy (bp->bp_chaddr, NetOurEther, 6);
 685         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 686
 687         /* Request additional information from the BOOTP/DHCP server */
 688 #if defined(CONFIG_CMD_DHCP)
 689         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 690 #else
 691         ext_len = BootpExtended((u8 *)bp->bp_vend);
 692 #endif
 693
 694         /*
 695          *      Bootp ID is the lower 4 bytes of our ethernet address
 696          *      plus the current time in ms.
 697          */
 698         BootpID = ((ulong)NetOurEther[2] << 24)
 699                 | ((ulong)NetOurEther[3] << 16)
 700                 | ((ulong)NetOurEther[4] << 8)
 701                 | (ulong)NetOurEther[5];
 702         BootpID += get_timer(0);
 703         BootpID  = htonl(BootpID);
 704         NetCopyLong(&bp->bp_id, &BootpID);
 705
 706         /*
 707          * Calculate proper packet lengths taking into account the
 708          * variable size of the options field
 709          */
 710         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 711         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 712         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 713         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 714
 715 #if defined(CONFIG_CMD_DHCP)
 716         dhcp_state = SELECTING;
 717         NetSetHandler(DhcpHandler);
 718 #else
 719         NetSetHandler(BootpHandler);
 720 #endif
 721         NetSendPacket(NetTxPacket, pktlen);
 722 }
 723
 724 #if defined(CONFIG_CMD_DHCP)
 725 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 726 {
 727         uchar *end = popt + BOOTP_HDR_SIZE;
 728         int oplen, size;
 729 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 730         int *to_ptr;
 731 #endif
 732
 733         while (popt < end && *popt != 0xff) {
 734                 oplen = *(popt + 1);
 735                 switch (*popt) {
 736                 case 1:
 737                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 738                         break;
 739 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 740                 case 2:         /* Time offset  */
 741                         to_ptr = &NetTimeOffset;
 742                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 743                         NetTimeOffset = ntohl (NetTimeOffset);
 744                         break;
 745 #endif
 746                 case 3:
 747                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 748                         break;
 749                 case 6:
 750                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 751 #if defined(CONFIG_BOOTP_DNS2)
 752                         if (*(popt + 1) > 4) {
 753                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 754                         }
 755 #endif
 756                         break;
 757                 case 12:
 758                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 759                         memcpy (&NetOurHostName, popt + 2, size);
 760                         NetOurHostName[size] = 0;
 761                         break;
 762                 case 15:        /* Ignore Domain Name Option */
 763                         break;
 764                 case 17:
 765                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 766                         memcpy (&NetOurRootPath, popt + 2, size);
 767                         NetOurRootPath[size] = 0;
 768                         break;
 769 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 770                 case 42:        /* NTP server IP */
 771                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 772                         break;
 773 #endif
 774                 case 51:
 775                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 776                         break;
 777                 case 53:        /* Ignore Message Type Option */
 778                         break;
 779                 case 54:
 780                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 781                         break;
 782                 case 58:        /* Ignore Renewal Time Option */
 783                         break;
 784                 case 59:        /* Ignore Rebinding Time Option */
 785                         break;
 786                 case 66:        /* Ignore TFTP server name */
 787                         break;
 788                 case 67:        /* vendor opt bootfile */
 789                         /*
 790                          * I can't use dhcp_vendorex_proc here because I need
 791                          * to write into the bootp packet - even then I had to
 792                          * pass the bootp packet pointer into here as the
 793                          * second arg
 794                          */
 795                         size = truncate_sz ("Opt Boot File",
 796                                             sizeof(bp->bp_file),
 797                                             oplen);
 798                         if (bp->bp_file[0] == '\0' && size > 0) {
 799                                 /*
 800                                  * only use vendor boot file if we didn't
 801                                  * receive a boot file in the main non-vendor
 802                                  * part of the packet - god only knows why
 803                                  * some vendors chose not to use this perfectly
 804                                  * good spot to store the boot file (join on
 805                                  * Tru64 Unix) it seems mind bogglingly crazy
 806                                  * to me
 807                                  */
 808                                 printf("*** WARNING: using vendor "
 809                                         "optional boot file\n");
 810                                 memcpy(bp->bp_file, popt + 2, size);
 811                                 bp->bp_file[size] = '\0';
 812                         }
 813                         break;
 814                 default:
 815 #if defined(CONFIG_BOOTP_VENDOREX)
 816                         if (dhcp_vendorex_proc (popt))
 817                                 break;
 818 #endif
 819                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 820                         break;
 821                 }
 822                 popt += oplen + 2;      /* Process next option */
 823         }
 824 }
 825
 826 static int DhcpMessageType(unsigned char *popt)
 827 {
 828         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 829                 return -1;
 830
 831         popt += 4;
 832         while ( *popt != 0xff ) {
 833                 if ( *popt == 53 )      /* DHCP Message Type */
 834                         return *(popt + 2);
 835                 popt += *(popt + 1) + 2;        /* Scan through all options */
 836         }
 837         return -1;
 838 }
 839
 840 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 841 {
 842         volatile uchar *pkt, *iphdr;
 843         Bootp_t *bp;
 844         int pktlen, iplen, extlen;
 845         IPaddr_t OfferedIP;
 846
 847         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 848         pkt = NetTxPacket;
 849         memset ((void*)pkt, 0, PKTSIZE);
 850
 851         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 852
 853         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 854         pkt += IP_HDR_SIZE;
 855
 856         bp = (Bootp_t *)pkt;
 857         bp->bp_op = OP_BOOTREQUEST;
 858         bp->bp_htype = HWT_ETHER;
 859         bp->bp_hlen = HWL_ETHER;
 860         bp->bp_hops = 0;
 861         bp->bp_secs = htons(get_timer(0) / 1000);
 862         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 863          * the server yet */
 864
 865         /*
 866          * RFC3046 requires Relay Agents to discard packets with
 867          * nonzero and offered giaddr
 868          */
 869         NetWriteIP(&bp->bp_giaddr, 0);
 870
 871         memcpy (bp->bp_chaddr, NetOurEther, 6);
 872
 873         /*
 874          * ID is the id of the OFFER packet
 875          */
 876
 877         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 878
 879         /*
 880          * Copy options from OFFER packet if present
 881          */
 882
 883         /* Copy offered IP into the parameters request list */
 884         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 885         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 886
 887         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 888         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 889         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 890
 891         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 892 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 893         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 894 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 895         NetSendPacket(NetTxPacket, pktlen);
 896 }
 897
 898 /*
 899  *      Handle DHCP received packets.
 900  */
 901 static void
 902 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 903             unsigned len)
 904 {
 905         Bootp_t *bp = (Bootp_t *)pkt;
 906
 907         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 908                 src, dest, len, dhcp_state);
 909
 910         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 911                 return;
 912
 913         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 914                 src, dest, len, dhcp_state);
 915
 916         switch (dhcp_state) {
 917         case SELECTING:
 918                 /*
 919                  * Wait an appropriate time for any potential DHCPOFFER packets
 920                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 921                  * If filename is in format we recognize, assume it is a valid
 922                  * OFFER from a server we want.
 923                  */
 924                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 925 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 926                 if (strncmp(bp->bp_file,
 927                             CONFIG_SYS_BOOTFILE_PREFIX,
 928                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 929 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 930
 931                         debug("TRANSITIONING TO REQUESTING STATE\n");
 932                         dhcp_state = REQUESTING;
 933
 934                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 935                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 936
 937                         NetSetTimeout(TIMEOUT, BootpTimeout);
 938                         DhcpSendRequestPkt(bp);
 939 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 940                 }
 941 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 942
 943                 return;
 944                 break;
 945         case REQUESTING:
 946                 debug("DHCP State: REQUESTING\n");
 947
 948                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 949                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 950                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 951                         BootpCopyNetParams(bp); /* Store net params from reply */
 952                         dhcp_state = BOUND;
 953                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 954                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
 955                                             "bootp_stop");
 956
 957                         net_auto_load();
 958                         return;
 959                 }
 960                 break;
 961         case BOUND:
 962                 /* DHCP client bound to address */
 963                 break;
 964         default:
 965                 puts ("DHCP: INVALID STATE\n");
 966                 break;
 967         }
 968
 969 }
 970
 971 void DhcpRequest(void)
 972 {
 973         BootpRequest();
 974 }
 975 #endif  /* CONFIG_CMD_DHCP */