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 /*
 294  *      Handle a BOOTP received packet.
 295  */
 296 static void
 297 BootpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 298              unsigned len)
 299 {
 300         Bootp_t *bp;
 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         net_auto_load();
 328 }
 329 #endif
 330
 331 /*
 332  *      Timeout on BOOTP/DHCP request.
 333  */
 334 static void
 335 BootpTimeout(void)
 336 {
 337         if (BootpTry >= TIMEOUT_COUNT) {
 338                 puts ("\nRetry count exceeded; starting again\n");
 339                 NetStartAgain ();
 340         } else {
 341                 NetSetTimeout (TIMEOUT, BootpTimeout);
 342                 BootpRequest ();
 343         }
 344 }
 345
 346 /*
 347  *      Initialize BOOTP extension fields in the request.
 348  */
 349 #if defined(CONFIG_CMD_DHCP)
 350 static int DhcpExtended (u8 * e, int message_type, IPaddr_t ServerID, IPaddr_t RequestedIP)
 351 {
 352         u8 *start = e;
 353         u8 *cnt;
 354 #if defined(CONFIG_BOOTP_PXE)
 355         char *uuid;
 356         size_t vci_strlen;
 357         u16 clientarch;
 358 #endif
 359
 360 #if defined(CONFIG_BOOTP_VENDOREX)
 361         u8 *x;
 362 #endif
 363 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 364         char *hostname;
 365 #endif
 366
 367         *e++ = 99;              /* RFC1048 Magic Cookie */
 368         *e++ = 130;
 369         *e++ = 83;
 370         *e++ = 99;
 371
 372         *e++ = 53;              /* DHCP Message Type */
 373         *e++ = 1;
 374         *e++ = message_type;
 375
 376         *e++ = 57;              /* Maximum DHCP Message Size */
 377         *e++ = 2;
 378         *e++ = (576 - 312 + OPT_SIZE) >> 8;
 379         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 380
 381         if (ServerID) {
 382                 int tmp = ntohl (ServerID);
 383
 384                 *e++ = 54;      /* ServerID */
 385                 *e++ = 4;
 386                 *e++ = tmp >> 24;
 387                 *e++ = tmp >> 16;
 388                 *e++ = tmp >> 8;
 389                 *e++ = tmp & 0xff;
 390         }
 391
 392         if (RequestedIP) {
 393                 int tmp = ntohl (RequestedIP);
 394
 395                 *e++ = 50;      /* Requested IP */
 396                 *e++ = 4;
 397                 *e++ = tmp >> 24;
 398                 *e++ = tmp >> 16;
 399                 *e++ = tmp >> 8;
 400                 *e++ = tmp & 0xff;
 401         }
 402 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 403         if ((hostname = getenv ("hostname"))) {
 404                 int hostnamelen = strlen (hostname);
 405
 406                 *e++ = 12;      /* Hostname */
 407                 *e++ = hostnamelen;
 408                 memcpy (e, hostname, hostnamelen);
 409                 e += hostnamelen;
 410         }
 411 #endif
 412
 413 #if defined(CONFIG_BOOTP_PXE)
 414         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 415         *e++ = 93;      /* Client System Architecture */
 416         *e++ = 2;
 417         *e++ = (clientarch >> 8) & 0xff;
 418         *e++ = clientarch & 0xff;
 419
 420         *e++ = 94;      /* Client Network Interface Identifier */
 421         *e++ = 3;
 422         *e++ = 1;       /* type field for UNDI */
 423         *e++ = 0;       /* major revision */
 424         *e++ = 0;       /* minor revision */
 425
 426         uuid = getenv("pxeuuid");
 427
 428         if (uuid) {
 429                 if (uuid_str_valid(uuid)) {
 430                         *e++ = 97;      /* Client Machine Identifier */
 431                         *e++ = 17;
 432                         *e++ = 0;       /* type 0 - UUID */
 433
 434                         uuid_str_to_bin(uuid, e);
 435                         e += 16;
 436                 } else {
 437                         printf("Invalid pxeuuid: %s\n", uuid);
 438                 }
 439         }
 440
 441         *e++ = 60;      /* Vendor Class Identifier */
 442         vci_strlen = strlen(CONFIG_BOOTP_VCI_STRING);
 443         *e++ = vci_strlen;
 444         memcpy(e, CONFIG_BOOTP_VCI_STRING, vci_strlen);
 445         e += vci_strlen;
 446 #endif
 447
 448 #if defined(CONFIG_BOOTP_VENDOREX)
 449         if ((x = dhcp_vendorex_prep (e)))
 450                 return x - start;
 451 #endif
 452
 453         *e++ = 55;              /* Parameter Request List */
 454          cnt = e++;             /* Pointer to count of requested items */
 455         *cnt = 0;
 456 #if defined(CONFIG_BOOTP_SUBNETMASK)
 457         *e++  = 1;              /* Subnet Mask */
 458         *cnt += 1;
 459 #endif
 460 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 461         *e++  = 2;
 462         *cnt += 1;
 463 #endif
 464 #if defined(CONFIG_BOOTP_GATEWAY)
 465         *e++  = 3;              /* Router Option */
 466         *cnt += 1;
 467 #endif
 468 #if defined(CONFIG_BOOTP_DNS)
 469         *e++  = 6;              /* DNS Server(s) */
 470         *cnt += 1;
 471 #endif
 472 #if defined(CONFIG_BOOTP_HOSTNAME)
 473         *e++  = 12;             /* Hostname */
 474         *cnt += 1;
 475 #endif
 476 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 477         *e++  = 13;             /* Boot File Size */
 478         *cnt += 1;
 479 #endif
 480 #if defined(CONFIG_BOOTP_BOOTPATH)
 481         *e++  = 17;             /* Boot path */
 482         *cnt += 1;
 483 #endif
 484 #if defined(CONFIG_BOOTP_NISDOMAIN)
 485         *e++  = 40;             /* NIS Domain name request */
 486         *cnt += 1;
 487 #endif
 488 #if defined(CONFIG_BOOTP_NTPSERVER)
 489         *e++  = 42;
 490         *cnt += 1;
 491 #endif
 492         /* no options, so back up to avoid sending an empty request list */
 493         if (*cnt == 0)
 494                 e -= 2;
 495
 496         *e++  = 255;            /* End of the list */
 497
 498         /* Pad to minimal length */
 499 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 500         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 501                 *e++ = 0;
 502 #endif
 503
 504         return e - start;
 505 }
 506
 507 #else
 508 /*
 509  *      Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 510  */
 511 static int BootpExtended (u8 * e)
 512 {
 513         u8 *start = e;
 514
 515         *e++ = 99;              /* RFC1048 Magic Cookie */
 516         *e++ = 130;
 517         *e++ = 83;
 518         *e++ = 99;
 519
 520 #if defined(CONFIG_CMD_DHCP)
 521         *e++ = 53;              /* DHCP Message Type */
 522         *e++ = 1;
 523         *e++ = DHCP_DISCOVER;
 524
 525         *e++ = 57;              /* Maximum DHCP Message Size */
 526         *e++ = 2;
 527         *e++ = (576 - 312 + OPT_SIZE) >> 16;
 528         *e++ = (576 - 312 + OPT_SIZE) & 0xff;
 529 #endif
 530
 531 #if defined(CONFIG_BOOTP_SUBNETMASK)
 532         *e++ = 1;               /* Subnet mask request */
 533         *e++ = 4;
 534         e   += 4;
 535 #endif
 536
 537 #if defined(CONFIG_BOOTP_GATEWAY)
 538         *e++ = 3;               /* Default gateway request */
 539         *e++ = 4;
 540         e   += 4;
 541 #endif
 542
 543 #if defined(CONFIG_BOOTP_DNS)
 544         *e++ = 6;               /* Domain Name Server */
 545         *e++ = 4;
 546         e   += 4;
 547 #endif
 548
 549 #if defined(CONFIG_BOOTP_HOSTNAME)
 550         *e++ = 12;              /* Host name request */
 551         *e++ = 32;
 552         e   += 32;
 553 #endif
 554
 555 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 556         *e++ = 13;              /* Boot file size */
 557         *e++ = 2;
 558         e   += 2;
 559 #endif
 560
 561 #if defined(CONFIG_BOOTP_BOOTPATH)
 562         *e++ = 17;              /* Boot path */
 563         *e++ = 32;
 564         e   += 32;
 565 #endif
 566
 567 #if defined(CONFIG_BOOTP_NISDOMAIN)
 568         *e++ = 40;              /* NIS Domain name request */
 569         *e++ = 32;
 570         e   += 32;
 571 #endif
 572 #if defined(CONFIG_BOOTP_NTPSERVER)
 573         *e++ = 42;
 574         *e++ = 4;
 575         e   += 4;
 576 #endif
 577
 578         *e++ = 255;             /* End of the list */
 579
 580         return e - start;
 581 }
 582 #endif
 583
 584 void
 585 BootpRequest (void)
 586 {
 587         volatile uchar *pkt, *iphdr;
 588         Bootp_t *bp;
 589         int ext_len, pktlen, iplen;
 590
 591 #if defined(CONFIG_CMD_DHCP)
 592         dhcp_state = INIT;
 593 #endif
 594
 595 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 596         unsigned char bi_enetaddr[6];
 597         int   reg;
 598         ulong tst1, tst2, sum, m_mask, m_value = 0;
 599
 600         if (BootpTry ==0) {
 601                 /* get our mac */
 602                 eth_getenv_enetaddr("ethaddr", bi_enetaddr);
 603
 604                 debug("BootpRequest => Our Mac: ");
 605                 for (reg=0; reg<6; reg++)
 606                         debug("%x%c", bi_enetaddr[reg], reg==5 ? '\n' : ':');
 607
 608                 /* Mac-Manipulation 2 get seed1 */
 609                 tst1=0;
 610                 tst2=0;
 611                 for (reg=2; reg<6; reg++) {
 612                         tst1 = tst1 << 8;
 613                         tst1 = tst1 | bi_enetaddr[reg];
 614                 }
 615                 for (reg=0; reg<2; reg++) {
 616                         tst2 = tst2 | bi_enetaddr[reg];
 617                         tst2 = tst2 << 8;
 618                 }
 619
 620                 seed1 = tst1^tst2;
 621
 622                 /* Mirror seed1*/
 623                 m_mask=0x1;
 624                 for (reg=1;reg<=32;reg++) {
 625                         m_value |= (m_mask & seed1);
 626                         seed1 = seed1 >> 1;
 627                         m_value = m_value << 1;
 628                 }
 629                 seed1 = m_value;
 630                 seed2 = 0xB78D0945;
 631         }
 632
 633         /* Random Number Generator */
 634
 635         for (reg=0;reg<=0;reg++) {
 636                 sum = seed1 + seed2;
 637                 if (sum < seed1 || sum < seed2)
 638                         sum++;
 639                 seed2 = seed1;
 640                 seed1 = sum;
 641
 642                 if (BootpTry<=2) {      /* Start with max 1024 * 1ms */
 643                         sum = sum >> (22-BootpTry);
 644                 } else {                /*After 3rd BOOTP request max 8192 * 1ms */
 645                         sum = sum >> 19;
 646                 }
 647         }
 648
 649         printf ("Random delay: %ld ms...\n", sum);
 650         for (reg=0; reg <sum; reg++) {
 651                 udelay(1000); /*Wait 1ms*/
 652         }
 653 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 654
 655         printf("BOOTP broadcast %d\n", ++BootpTry);
 656         pkt = NetTxPacket;
 657         memset ((void*)pkt, 0, PKTSIZE);
 658
 659         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 660
 661         /*
 662          * Next line results in incorrect packet size being transmitted, resulting
 663          * in errors in some DHCP servers, reporting missing bytes.  Size must be
 664          * set in packet header after extension length has been determined.
 665          * C. Hallinan, DS4.COM, Inc.
 666          */
 667         /* NetSetIP(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, sizeof (Bootp_t)); */
 668         iphdr = pkt;    /* We need this later for NetSetIP() */
 669         pkt += IP_HDR_SIZE;
 670
 671         bp = (Bootp_t *)pkt;
 672         bp->bp_op = OP_BOOTREQUEST;
 673         bp->bp_htype = HWT_ETHER;
 674         bp->bp_hlen = HWL_ETHER;
 675         bp->bp_hops = 0;
 676         bp->bp_secs = htons(get_timer(0) / 1000);
 677         NetWriteIP(&bp->bp_ciaddr, 0);
 678         NetWriteIP(&bp->bp_yiaddr, 0);
 679         NetWriteIP(&bp->bp_siaddr, 0);
 680         NetWriteIP(&bp->bp_giaddr, 0);
 681         memcpy (bp->bp_chaddr, NetOurEther, 6);
 682         copy_filename (bp->bp_file, BootFile, sizeof(bp->bp_file));
 683
 684         /* Request additional information from the BOOTP/DHCP server */
 685 #if defined(CONFIG_CMD_DHCP)
 686         ext_len = DhcpExtended((u8 *)bp->bp_vend, DHCP_DISCOVER, 0, 0);
 687 #else
 688         ext_len = BootpExtended((u8 *)bp->bp_vend);
 689 #endif
 690
 691         /*
 692          *      Bootp ID is the lower 4 bytes of our ethernet address
 693          *      plus the current time in ms.
 694          */
 695         BootpID = ((ulong)NetOurEther[2] << 24)
 696                 | ((ulong)NetOurEther[3] << 16)
 697                 | ((ulong)NetOurEther[4] << 8)
 698                 | (ulong)NetOurEther[5];
 699         BootpID += get_timer(0);
 700         BootpID  = htonl(BootpID);
 701         NetCopyLong(&bp->bp_id, &BootpID);
 702
 703         /*
 704          * Calculate proper packet lengths taking into account the
 705          * variable size of the options field
 706          */
 707         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 708         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + ext_len;
 709         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 710         NetSetTimeout(SELECT_TIMEOUT, BootpTimeout);
 711
 712 #if defined(CONFIG_CMD_DHCP)
 713         dhcp_state = SELECTING;
 714         NetSetHandler(DhcpHandler);
 715 #else
 716         NetSetHandler(BootpHandler);
 717 #endif
 718         NetSendPacket(NetTxPacket, pktlen);
 719 }
 720
 721 #if defined(CONFIG_CMD_DHCP)
 722 static void DhcpOptionsProcess (uchar * popt, Bootp_t *bp)
 723 {
 724         uchar *end = popt + BOOTP_HDR_SIZE;
 725         int oplen, size;
 726 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 727         int *to_ptr;
 728 #endif
 729
 730         while (popt < end && *popt != 0xff) {
 731                 oplen = *(popt + 1);
 732                 switch (*popt) {
 733                 case 1:
 734                         NetCopyIP (&NetOurSubnetMask, (popt + 2));
 735                         break;
 736 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 737                 case 2:         /* Time offset  */
 738                         to_ptr = &NetTimeOffset;
 739                         NetCopyLong ((ulong *)to_ptr, (ulong *)(popt + 2));
 740                         NetTimeOffset = ntohl (NetTimeOffset);
 741                         break;
 742 #endif
 743                 case 3:
 744                         NetCopyIP (&NetOurGatewayIP, (popt + 2));
 745                         break;
 746                 case 6:
 747                         NetCopyIP (&NetOurDNSIP, (popt + 2));
 748 #if defined(CONFIG_BOOTP_DNS2)
 749                         if (*(popt + 1) > 4) {
 750                                 NetCopyIP (&NetOurDNS2IP, (popt + 2 + 4));
 751                         }
 752 #endif
 753                         break;
 754                 case 12:
 755                         size = truncate_sz ("Host Name", sizeof (NetOurHostName), oplen);
 756                         memcpy (&NetOurHostName, popt + 2, size);
 757                         NetOurHostName[size] = 0;
 758                         break;
 759                 case 15:        /* Ignore Domain Name Option */
 760                         break;
 761                 case 17:
 762                         size = truncate_sz ("Root Path", sizeof (NetOurRootPath), oplen);
 763                         memcpy (&NetOurRootPath, popt + 2, size);
 764                         NetOurRootPath[size] = 0;
 765                         break;
 766 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 767                 case 42:        /* NTP server IP */
 768                         NetCopyIP (&NetNtpServerIP, (popt + 2));
 769                         break;
 770 #endif
 771                 case 51:
 772                         NetCopyLong (&dhcp_leasetime, (ulong *) (popt + 2));
 773                         break;
 774                 case 53:        /* Ignore Message Type Option */
 775                         break;
 776                 case 54:
 777                         NetCopyIP (&NetDHCPServerIP, (popt + 2));
 778                         break;
 779                 case 58:        /* Ignore Renewal Time Option */
 780                         break;
 781                 case 59:        /* Ignore Rebinding Time Option */
 782                         break;
 783                 case 66:        /* Ignore TFTP server name */
 784                         break;
 785                 case 67:        /* vendor opt bootfile */
 786                         /*
 787                          * I can't use dhcp_vendorex_proc here because I need
 788                          * to write into the bootp packet - even then I had to
 789                          * pass the bootp packet pointer into here as the
 790                          * second arg
 791                          */
 792                         size = truncate_sz ("Opt Boot File",
 793                                             sizeof(bp->bp_file),
 794                                             oplen);
 795                         if (bp->bp_file[0] == '\0' && size > 0) {
 796                                 /*
 797                                  * only use vendor boot file if we didn't
 798                                  * receive a boot file in the main non-vendor
 799                                  * part of the packet - god only knows why
 800                                  * some vendors chose not to use this perfectly
 801                                  * good spot to store the boot file (join on
 802                                  * Tru64 Unix) it seems mind bogglingly crazy
 803                                  * to me
 804                                  */
 805                                 printf("*** WARNING: using vendor "
 806                                         "optional boot file\n");
 807                                 memcpy(bp->bp_file, popt + 2, size);
 808                                 bp->bp_file[size] = '\0';
 809                         }
 810                         break;
 811                 default:
 812 #if defined(CONFIG_BOOTP_VENDOREX)
 813                         if (dhcp_vendorex_proc (popt))
 814                                 break;
 815 #endif
 816                         printf ("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
 817                         break;
 818                 }
 819                 popt += oplen + 2;      /* Process next option */
 820         }
 821 }
 822
 823 static int DhcpMessageType(unsigned char *popt)
 824 {
 825         if (NetReadLong((ulong*)popt) != htonl(BOOTP_VENDOR_MAGIC))
 826                 return -1;
 827
 828         popt += 4;
 829         while ( *popt != 0xff ) {
 830                 if ( *popt == 53 )      /* DHCP Message Type */
 831                         return *(popt + 2);
 832                 popt += *(popt + 1) + 2;        /* Scan through all options */
 833         }
 834         return -1;
 835 }
 836
 837 static void DhcpSendRequestPkt(Bootp_t *bp_offer)
 838 {
 839         volatile uchar *pkt, *iphdr;
 840         Bootp_t *bp;
 841         int pktlen, iplen, extlen;
 842         IPaddr_t OfferedIP;
 843
 844         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 845         pkt = NetTxPacket;
 846         memset ((void*)pkt, 0, PKTSIZE);
 847
 848         pkt += NetSetEther(pkt, NetBcastAddr, PROT_IP);
 849
 850         iphdr = pkt;            /* We'll need this later to set proper pkt size */
 851         pkt += IP_HDR_SIZE;
 852
 853         bp = (Bootp_t *)pkt;
 854         bp->bp_op = OP_BOOTREQUEST;
 855         bp->bp_htype = HWT_ETHER;
 856         bp->bp_hlen = HWL_ETHER;
 857         bp->bp_hops = 0;
 858         bp->bp_secs = htons(get_timer(0) / 1000);
 859         /* Do not set the client IP, your IP, or server IP yet, since it hasn't been ACK'ed by
 860          * the server yet */
 861
 862         /*
 863          * RFC3046 requires Relay Agents to discard packets with
 864          * nonzero and offered giaddr
 865          */
 866         NetWriteIP(&bp->bp_giaddr, 0);
 867
 868         memcpy (bp->bp_chaddr, NetOurEther, 6);
 869
 870         /*
 871          * ID is the id of the OFFER packet
 872          */
 873
 874         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 875
 876         /*
 877          * Copy options from OFFER packet if present
 878          */
 879
 880         /* Copy offered IP into the parameters request list */
 881         NetCopyIP(&OfferedIP, &bp_offer->bp_yiaddr);
 882         extlen = DhcpExtended((u8 *)bp->bp_vend, DHCP_REQUEST, NetDHCPServerIP, OfferedIP);
 883
 884         pktlen = ((int)(pkt-NetTxPacket)) + BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 885         iplen = BOOTP_HDR_SIZE - sizeof(bp->bp_vend) + extlen;
 886         NetSetIP(iphdr, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC, iplen);
 887
 888         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 889 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 890         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 891 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 892         NetSendPacket(NetTxPacket, pktlen);
 893 }
 894
 895 /*
 896  *      Handle DHCP received packets.
 897  */
 898 static void
 899 DhcpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 900             unsigned len)
 901 {
 902         Bootp_t *bp = (Bootp_t *)pkt;
 903
 904         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 905                 src, dest, len, dhcp_state);
 906
 907         if (BootpCheckPkt(pkt, dest, src, len)) /* Filter out pkts we don't want */
 908                 return;
 909
 910         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: %d\n",
 911                 src, dest, len, dhcp_state);
 912
 913         switch (dhcp_state) {
 914         case SELECTING:
 915                 /*
 916                  * Wait an appropriate time for any potential DHCPOFFER packets
 917                  * to arrive.  Then select one, and generate DHCPREQUEST response.
 918                  * If filename is in format we recognize, assume it is a valid
 919                  * OFFER from a server we want.
 920                  */
 921                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 922 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 923                 if (strncmp(bp->bp_file,
 924                             CONFIG_SYS_BOOTFILE_PREFIX,
 925                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0 ) {
 926 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 927
 928                         debug("TRANSITIONING TO REQUESTING STATE\n");
 929                         dhcp_state = REQUESTING;
 930
 931                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 932                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 933
 934                         NetSetTimeout(TIMEOUT, BootpTimeout);
 935                         DhcpSendRequestPkt(bp);
 936 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 937                 }
 938 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 939
 940                 return;
 941                 break;
 942         case REQUESTING:
 943                 debug("DHCP State: REQUESTING\n");
 944
 945                 if ( DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK ) {
 946                         if (NetReadLong((ulong*)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 947                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 948                         BootpCopyNetParams(bp); /* Store net params from reply */
 949                         dhcp_state = BOUND;
 950                         printf ("DHCP client bound to address %pI4\n", &NetOurIP);
 951
 952                         net_auto_load();
 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 */