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