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 /*
  27  * The timeout for the initial BOOTP/DHCP request used to be described by a
  28  * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
  29  * that counter
  30  *
  31  * Now that the timeout periods are variable (exponential backoff and retry)
  32  * we convert the timeout count to the absolute time it would have take to
  33  * execute that many retries, and keep sending retry packets until that time
  34  * is reached.
  35  */
  36 #ifndef CONFIG_NET_RETRY_COUNT
  37 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up */
  38 #else
  39 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  40 #endif
  41 #define TIMEOUT_MS      ((3 + (TIMEOUT_COUNT * 5)) * 1000)
  42
  43 #define PORT_BOOTPS     67              /* BOOTP server UDP port */
  44 #define PORT_BOOTPC     68              /* BOOTP client UDP port */
  45
  46 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list */
  47 #define CONFIG_DHCP_MIN_EXT_LEN 64
  48 #endif
  49
  50 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
  51 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
  52 #endif
  53
  54 ulong           bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
  55 unsigned int    bootp_num_ids;
  56 int             BootpTry;
  57 ulong           bootp_start;
  58 ulong           bootp_timeout;
  59
  60 #if defined(CONFIG_CMD_DHCP)
  61 static dhcp_state_t dhcp_state = INIT;
  62 static unsigned long dhcp_leasetime;
  63 static struct in_addr dhcp_server_ip;
  64 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
  65                         unsigned src, unsigned len);
  66
  67 /* For Debug */
  68 #if 0
  69 static char *dhcpmsg2str(int type)
  70 {
  71         switch (type) {
  72         case 1:  return "DHCPDISCOVER"; break;
  73         case 2:  return "DHCPOFFER";    break;
  74         case 3:  return "DHCPREQUEST";  break;
  75         case 4:  return "DHCPDECLINE";  break;
  76         case 5:  return "DHCPACK";      break;
  77         case 6:  return "DHCPNACK";     break;
  78         case 7:  return "DHCPRELEASE";  break;
  79         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  80         }
  81 }
  82 #endif
  83 #endif
  84
  85 static void bootp_add_id(ulong id)
  86 {
  87         if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
  88                 size_t size = sizeof(bootp_ids) - sizeof(id);
  89
  90                 memmove(bootp_ids, &bootp_ids[1], size);
  91                 bootp_ids[bootp_num_ids - 1] = id;
  92         } else {
  93                 bootp_ids[bootp_num_ids] = id;
  94                 bootp_num_ids++;
  95         }
  96 }
  97
  98 static bool bootp_match_id(ulong id)
  99 {
 100         unsigned int i;
 101
 102         for (i = 0; i < bootp_num_ids; i++)
 103                 if (bootp_ids[i] == id)
 104                         return true;
 105
 106         return false;
 107 }
 108
 109 static int BootpCheckPkt(uchar *pkt, unsigned dest, unsigned src, unsigned len)
 110 {
 111         struct Bootp_t *bp = (struct Bootp_t *) pkt;
 112         int retval = 0;
 113
 114         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
 115                 retval = -1;
 116         else if (len < sizeof(struct Bootp_t) - OPT_FIELD_SIZE)
 117                 retval = -2;
 118         else if (bp->bp_op != OP_BOOTREQUEST &&
 119                         bp->bp_op != OP_BOOTREPLY &&
 120                         bp->bp_op != DHCP_OFFER &&
 121                         bp->bp_op != DHCP_ACK &&
 122                         bp->bp_op != DHCP_NAK)
 123                 retval = -3;
 124         else if (bp->bp_htype != HWT_ETHER)
 125                 retval = -4;
 126         else if (bp->bp_hlen != HWL_ETHER)
 127                 retval = -5;
 128         else if (!bootp_match_id(NetReadLong((ulong *)&bp->bp_id)))
 129                 retval = -6;
 130
 131         debug("Filtering pkt = %d\n", retval);
 132
 133         return retval;
 134 }
 135
 136 /*
 137  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 138  */
 139 static void BootpCopyNetParams(struct Bootp_t *bp)
 140 {
 141 #if !defined(CONFIG_BOOTP_SERVERIP)
 142         struct in_addr tmp_ip;
 143
 144         net_copy_ip(&tmp_ip, &bp->bp_siaddr);
 145         if (tmp_ip.s_addr != 0)
 146                 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
 147         memcpy(NetServerEther, ((struct ethernet_hdr *)NetRxPacket)->et_src, 6);
 148         if (strlen(bp->bp_file) > 0)
 149                 copy_filename(BootFile, bp->bp_file, sizeof(BootFile));
 150
 151         debug("Bootfile: %s\n", BootFile);
 152
 153         /* Propagate to environment:
 154          * don't delete exising entry when BOOTP / DHCP reply does
 155          * not contain a new value
 156          */
 157         if (*BootFile)
 158                 setenv("bootfile", BootFile);
 159 #endif
 160         net_copy_ip(&net_ip, &bp->bp_yiaddr);
 161 }
 162
 163 static int truncate_sz(const char *name, int maxlen, int curlen)
 164 {
 165         if (curlen >= maxlen) {
 166                 printf("*** WARNING: %s is too long (%d - max: %d)"
 167                         " - truncated\n", name, curlen, maxlen);
 168                 curlen = maxlen - 1;
 169         }
 170         return curlen;
 171 }
 172
 173 #if !defined(CONFIG_CMD_DHCP)
 174
 175 static void BootpVendorFieldProcess(u8 *ext)
 176 {
 177         int size = *(ext + 1);
 178
 179         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 180                 *(ext + 1));
 181
 182         NetBootFileSize = 0;
 183
 184         switch (*ext) {
 185                 /* Fixed length fields */
 186         case 1:                 /* Subnet mask */
 187                 if (net_netmask.s_addr == 0)
 188                         net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
 189                 break;
 190         case 2:                 /* Time offset - Not yet supported */
 191                 break;
 192                 /* Variable length fields */
 193         case 3:                 /* Gateways list */
 194                 if (net_gateway.s_addr == 0)
 195                         net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
 196                 break;
 197         case 4:                 /* Time server - Not yet supported */
 198                 break;
 199         case 5:                 /* IEN-116 name server - Not yet supported */
 200                 break;
 201         case 6:
 202                 if (net_dns_server.s_addr == 0)
 203                         net_copy_ip(&net_dns_server,
 204                                     (struct in_addr *)(ext + 2));
 205 #if defined(CONFIG_BOOTP_DNS2)
 206                 if ((net_dns_server2.s_addr == 0) && (size > 4))
 207                         net_copy_ip(&net_dns_server2,
 208                                     (struct in_addr *)(ext + 2 + 4));
 209 #endif
 210                 break;
 211         case 7:                 /* Log server - Not yet supported */
 212                 break;
 213         case 8:                 /* Cookie/Quote server - Not yet supported */
 214                 break;
 215         case 9:                 /* LPR server - Not yet supported */
 216                 break;
 217         case 10:                /* Impress server - Not yet supported */
 218                 break;
 219         case 11:                /* RPL server - Not yet supported */
 220                 break;
 221         case 12:                /* Host name */
 222                 if (NetOurHostName[0] == 0) {
 223                         size = truncate_sz("Host Name",
 224                                 sizeof(NetOurHostName), size);
 225                         memcpy(&NetOurHostName, ext + 2, size);
 226                         NetOurHostName[size] = 0;
 227                 }
 228                 break;
 229         case 13:                /* Boot file size */
 230                 if (size == 2)
 231                         NetBootFileSize = ntohs(*(ushort *) (ext + 2));
 232                 else if (size == 4)
 233                         NetBootFileSize = ntohl(*(ulong *) (ext + 2));
 234                 break;
 235         case 14:                /* Merit dump file - Not yet supported */
 236                 break;
 237         case 15:                /* Domain name - Not yet supported */
 238                 break;
 239         case 16:                /* Swap server - Not yet supported */
 240                 break;
 241         case 17:                /* Root path */
 242                 if (NetOurRootPath[0] == 0) {
 243                         size = truncate_sz("Root Path",
 244                                 sizeof(NetOurRootPath), size);
 245                         memcpy(&NetOurRootPath, ext + 2, size);
 246                         NetOurRootPath[size] = 0;
 247                 }
 248                 break;
 249         case 18:                /* Extension path - Not yet supported */
 250                 /*
 251                  * This can be used to send the information of the
 252                  * vendor area in another file that the client can
 253                  * access via TFTP.
 254                  */
 255                 break;
 256                 /* IP host layer fields */
 257         case 40:                /* NIS Domain name */
 258                 if (NetOurNISDomain[0] == 0) {
 259                         size = truncate_sz("NIS Domain Name",
 260                                 sizeof(NetOurNISDomain), size);
 261                         memcpy(&NetOurNISDomain, ext + 2, size);
 262                         NetOurNISDomain[size] = 0;
 263                 }
 264                 break;
 265 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 266         case 42:        /* NTP server IP */
 267                 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
 268                 break;
 269 #endif
 270                 /* Application layer fields */
 271         case 43:                /* Vendor specific info - Not yet supported */
 272                 /*
 273                  * Binary information to exchange specific
 274                  * product information.
 275                  */
 276                 break;
 277                 /* Reserved (custom) fields (128..254) */
 278         }
 279 }
 280
 281 static void BootpVendorProcess(u8 *ext, int size)
 282 {
 283         u8 *end = ext + size;
 284
 285         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 286
 287         while ((ext < end) && (*ext != 0xff)) {
 288                 if (*ext == 0) {
 289                         ext++;
 290                 } else {
 291                         u8 *opt = ext;
 292
 293                         ext += ext[1] + 2;
 294                         if (ext <= end)
 295                                 BootpVendorFieldProcess(opt);
 296                 }
 297         }
 298
 299         debug("[BOOTP] Received fields:\n");
 300         if (net_netmask.s_addr)
 301                 debug("net_netmask : %pI4\n", &net_netmask);
 302
 303         if (net_gateway.s_addr)
 304                 debug("net_gateway      : %pI4", &net_gateway);
 305
 306         if (NetBootFileSize)
 307                 debug("NetBootFileSize : %d\n", NetBootFileSize);
 308
 309         if (NetOurHostName[0])
 310                 debug("NetOurHostName  : %s\n", NetOurHostName);
 311
 312         if (NetOurRootPath[0])
 313                 debug("NetOurRootPath  : %s\n", NetOurRootPath);
 314
 315         if (NetOurNISDomain[0])
 316                 debug("NetOurNISDomain : %s\n", NetOurNISDomain);
 317
 318         if (NetBootFileSize)
 319                 debug("NetBootFileSize: %d\n", NetBootFileSize);
 320
 321 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 322         if (net_ntp_server)
 323                 debug("net_ntp_server : %pI4\n", &net_ntp_server);
 324 #endif
 325 }
 326
 327 /*
 328  *      Handle a BOOTP received packet.
 329  */
 330 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 331                           unsigned src, unsigned len)
 332 {
 333         struct Bootp_t *bp;
 334
 335         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 336                 src, dest, len, sizeof(struct Bootp_t));
 337
 338         bp = (struct Bootp_t *)pkt;
 339
 340         /* Filter out pkts we don't want */
 341         if (BootpCheckPkt(pkt, dest, src, len))
 342                 return;
 343
 344         /*
 345          *      Got a good BOOTP reply.  Copy the data into our variables.
 346          */
 347 #ifdef CONFIG_STATUS_LED
 348         status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
 349 #endif
 350
 351         BootpCopyNetParams(bp);         /* Store net parameters from reply */
 352
 353         /* Retrieve extended information (we must parse the vendor area) */
 354         if (NetReadLong((ulong *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 355                 BootpVendorProcess((uchar *)&bp->bp_vend[4], len);
 356
 357         NetSetTimeout(0, (thand_f *)0);
 358         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
 359
 360         debug("Got good BOOTP\n");
 361
 362         net_auto_load();
 363 }
 364 #endif
 365
 366 /*
 367  *      Timeout on BOOTP/DHCP request.
 368  */
 369 static void
 370 BootpTimeout(void)
 371 {
 372         ulong time_taken = get_timer(bootp_start);
 373
 374         if (time_taken >= TIMEOUT_MS) {
 375 #ifdef CONFIG_BOOTP_MAY_FAIL
 376                 puts("\nRetry time exceeded\n");
 377                 net_set_state(NETLOOP_FAIL);
 378 #else
 379                 puts("\nRetry time exceeded; starting again\n");
 380                 NetStartAgain();
 381 #endif
 382         } else {
 383                 bootp_timeout *= 2;
 384                 if (bootp_timeout > 2000)
 385                         bootp_timeout = 2000;
 386                 NetSetTimeout(bootp_timeout, BootpTimeout);
 387                 BootpRequest();
 388         }
 389 }
 390
 391 #define put_vci(e, str)                                         \
 392         do {                                                    \
 393                 size_t vci_strlen = strlen(str);                \
 394                 *e++ = 60;      /* Vendor Class Identifier */   \
 395                 *e++ = vci_strlen;                              \
 396                 memcpy(e, str, vci_strlen);                     \
 397                 e += vci_strlen;                                \
 398         } while (0)
 399
 400 /*
 401  *      Initialize BOOTP extension fields in the request.
 402  */
 403 #if defined(CONFIG_CMD_DHCP)
 404 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
 405                         struct in_addr requested_ip)
 406 {
 407         u8 *start = e;
 408         u8 *cnt;
 409 #if defined(CONFIG_BOOTP_PXE)
 410         char *uuid;
 411         u16 clientarch;
 412 #endif
 413
 414 #if defined(CONFIG_BOOTP_VENDOREX)
 415         u8 *x;
 416 #endif
 417 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 418         char *hostname;
 419 #endif
 420
 421         *e++ = 99;              /* RFC1048 Magic Cookie */
 422         *e++ = 130;
 423         *e++ = 83;
 424         *e++ = 99;
 425
 426         *e++ = 53;              /* DHCP Message Type */
 427         *e++ = 1;
 428         *e++ = message_type;
 429
 430         *e++ = 57;              /* Maximum DHCP Message Size */
 431         *e++ = 2;
 432         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
 433         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 434
 435         if (server_ip.s_addr) {
 436                 int tmp = ntohl(server_ip.s_addr);
 437
 438                 *e++ = 54;      /* ServerID */
 439                 *e++ = 4;
 440                 *e++ = tmp >> 24;
 441                 *e++ = tmp >> 16;
 442                 *e++ = tmp >> 8;
 443                 *e++ = tmp & 0xff;
 444         }
 445
 446         if (requested_ip.s_addr) {
 447                 int tmp = ntohl(requested_ip.s_addr);
 448
 449                 *e++ = 50;      /* Requested IP */
 450                 *e++ = 4;
 451                 *e++ = tmp >> 24;
 452                 *e++ = tmp >> 16;
 453                 *e++ = tmp >> 8;
 454                 *e++ = tmp & 0xff;
 455         }
 456 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 457         hostname = getenv("hostname");
 458         if (hostname) {
 459                 int hostnamelen = strlen(hostname);
 460
 461                 *e++ = 12;      /* Hostname */
 462                 *e++ = hostnamelen;
 463                 memcpy(e, hostname, hostnamelen);
 464                 e += hostnamelen;
 465         }
 466 #endif
 467
 468 #if defined(CONFIG_BOOTP_PXE)
 469         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 470         *e++ = 93;      /* Client System Architecture */
 471         *e++ = 2;
 472         *e++ = (clientarch >> 8) & 0xff;
 473         *e++ = clientarch & 0xff;
 474
 475         *e++ = 94;      /* Client Network Interface Identifier */
 476         *e++ = 3;
 477         *e++ = 1;       /* type field for UNDI */
 478         *e++ = 0;       /* major revision */
 479         *e++ = 0;       /* minor revision */
 480
 481         uuid = getenv("pxeuuid");
 482
 483         if (uuid) {
 484                 if (uuid_str_valid(uuid)) {
 485                         *e++ = 97;      /* Client Machine Identifier */
 486                         *e++ = 17;
 487                         *e++ = 0;       /* type 0 - UUID */
 488
 489                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
 490                         e += 16;
 491                 } else {
 492                         printf("Invalid pxeuuid: %s\n", uuid);
 493                 }
 494         }
 495 #endif
 496
 497 #ifdef CONFIG_BOOTP_VCI_STRING
 498         put_vci(e, CONFIG_BOOTP_VCI_STRING);
 499 #endif
 500
 501 #if defined(CONFIG_BOOTP_VENDOREX)
 502         x = dhcp_vendorex_prep(e);
 503         if (x)
 504                 return x - start;
 505 #endif
 506
 507         *e++ = 55;              /* Parameter Request List */
 508          cnt = e++;             /* Pointer to count of requested items */
 509         *cnt = 0;
 510 #if defined(CONFIG_BOOTP_SUBNETMASK)
 511         *e++  = 1;              /* Subnet Mask */
 512         *cnt += 1;
 513 #endif
 514 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 515         *e++  = 2;
 516         *cnt += 1;
 517 #endif
 518 #if defined(CONFIG_BOOTP_GATEWAY)
 519         *e++  = 3;              /* Router Option */
 520         *cnt += 1;
 521 #endif
 522 #if defined(CONFIG_BOOTP_DNS)
 523         *e++  = 6;              /* DNS Server(s) */
 524         *cnt += 1;
 525 #endif
 526 #if defined(CONFIG_BOOTP_HOSTNAME)
 527         *e++  = 12;             /* Hostname */
 528         *cnt += 1;
 529 #endif
 530 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 531         *e++  = 13;             /* Boot File Size */
 532         *cnt += 1;
 533 #endif
 534 #if defined(CONFIG_BOOTP_BOOTPATH)
 535         *e++  = 17;             /* Boot path */
 536         *cnt += 1;
 537 #endif
 538 #if defined(CONFIG_BOOTP_NISDOMAIN)
 539         *e++  = 40;             /* NIS Domain name request */
 540         *cnt += 1;
 541 #endif
 542 #if defined(CONFIG_BOOTP_NTPSERVER)
 543         *e++  = 42;
 544         *cnt += 1;
 545 #endif
 546         /* no options, so back up to avoid sending an empty request list */
 547         if (*cnt == 0)
 548                 e -= 2;
 549
 550         *e++  = 255;            /* End of the list */
 551
 552         /* Pad to minimal length */
 553 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 554         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 555                 *e++ = 0;
 556 #endif
 557
 558         return e - start;
 559 }
 560
 561 #else
 562 /*
 563  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 564  */
 565 static int bootp_extended(u8 *e)
 566 {
 567         u8 *start = e;
 568
 569         *e++ = 99;              /* RFC1048 Magic Cookie */
 570         *e++ = 130;
 571         *e++ = 83;
 572         *e++ = 99;
 573
 574 #if defined(CONFIG_CMD_DHCP)
 575         *e++ = 53;              /* DHCP Message Type */
 576         *e++ = 1;
 577         *e++ = DHCP_DISCOVER;
 578
 579         *e++ = 57;              /* Maximum DHCP Message Size */
 580         *e++ = 2;
 581         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
 582         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 583 #endif
 584
 585 #if defined(CONFIG_BOOTP_VCI_STRING) || \
 586         (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
 587 #ifdef CONFIG_SPL_BUILD
 588         put_vci(e, CONFIG_SPL_NET_VCI_STRING);
 589 #else
 590         put_vci(e, CONFIG_BOOTP_VCI_STRING);
 591 #endif
 592 #endif
 593
 594 #if defined(CONFIG_BOOTP_SUBNETMASK)
 595         *e++ = 1;               /* Subnet mask request */
 596         *e++ = 4;
 597         e   += 4;
 598 #endif
 599
 600 #if defined(CONFIG_BOOTP_GATEWAY)
 601         *e++ = 3;               /* Default gateway request */
 602         *e++ = 4;
 603         e   += 4;
 604 #endif
 605
 606 #if defined(CONFIG_BOOTP_DNS)
 607         *e++ = 6;               /* Domain Name Server */
 608         *e++ = 4;
 609         e   += 4;
 610 #endif
 611
 612 #if defined(CONFIG_BOOTP_HOSTNAME)
 613         *e++ = 12;              /* Host name request */
 614         *e++ = 32;
 615         e   += 32;
 616 #endif
 617
 618 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 619         *e++ = 13;              /* Boot file size */
 620         *e++ = 2;
 621         e   += 2;
 622 #endif
 623
 624 #if defined(CONFIG_BOOTP_BOOTPATH)
 625         *e++ = 17;              /* Boot path */
 626         *e++ = 32;
 627         e   += 32;
 628 #endif
 629
 630 #if defined(CONFIG_BOOTP_NISDOMAIN)
 631         *e++ = 40;              /* NIS Domain name request */
 632         *e++ = 32;
 633         e   += 32;
 634 #endif
 635 #if defined(CONFIG_BOOTP_NTPSERVER)
 636         *e++ = 42;
 637         *e++ = 4;
 638         e   += 4;
 639 #endif
 640
 641         *e++ = 255;             /* End of the list */
 642
 643         return e - start;
 644 }
 645 #endif
 646
 647 void BootpReset(void)
 648 {
 649         bootp_num_ids = 0;
 650         BootpTry = 0;
 651         bootp_start = get_timer(0);
 652         bootp_timeout = 250;
 653 }
 654
 655 void
 656 BootpRequest(void)
 657 {
 658         uchar *pkt, *iphdr;
 659         struct Bootp_t *bp;
 660         int extlen, pktlen, iplen;
 661         int eth_hdr_size;
 662 #ifdef CONFIG_BOOTP_RANDOM_DELAY
 663         ulong rand_ms;
 664 #endif
 665         ulong BootpID;
 666         struct in_addr zero_ip;
 667         struct in_addr bcast_ip;
 668
 669         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 670 #if defined(CONFIG_CMD_DHCP)
 671         dhcp_state = INIT;
 672 #endif
 673
 674 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 675         if (BootpTry == 0)
 676                 srand_mac();
 677
 678         if (BootpTry <= 2)      /* Start with max 1024 * 1ms */
 679                 rand_ms = rand() >> (22 - BootpTry);
 680         else            /* After 3rd BOOTP request max 8192 * 1ms */
 681                 rand_ms = rand() >> 19;
 682
 683         printf("Random delay: %ld ms...\n", rand_ms);
 684         mdelay(rand_ms);
 685
 686 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 687
 688         printf("BOOTP broadcast %d\n", ++BootpTry);
 689         pkt = NetTxPacket;
 690         memset((void *)pkt, 0, PKTSIZE);
 691
 692         eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
 693         pkt += eth_hdr_size;
 694
 695         /*
 696          * Next line results in incorrect packet size being transmitted,
 697          * resulting in errors in some DHCP servers, reporting missing bytes.
 698          * Size must be set in packet header after extension length has been
 699          * determined.
 700          * C. Hallinan, DS4.COM, Inc.
 701          */
 702         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
 703                 sizeof (struct Bootp_t)); */
 704         iphdr = pkt;    /* We need this later for net_set_udp_header() */
 705         pkt += IP_UDP_HDR_SIZE;
 706
 707         bp = (struct Bootp_t *)pkt;
 708         bp->bp_op = OP_BOOTREQUEST;
 709         bp->bp_htype = HWT_ETHER;
 710         bp->bp_hlen = HWL_ETHER;
 711         bp->bp_hops = 0;
 712         bp->bp_secs = htons(get_timer(0) / 1000);
 713         zero_ip.s_addr = 0;
 714         net_write_ip(&bp->bp_ciaddr, zero_ip);
 715         net_write_ip(&bp->bp_yiaddr, zero_ip);
 716         net_write_ip(&bp->bp_siaddr, zero_ip);
 717         net_write_ip(&bp->bp_giaddr, zero_ip);
 718         memcpy(bp->bp_chaddr, NetOurEther, 6);
 719         copy_filename(bp->bp_file, BootFile, sizeof(bp->bp_file));
 720
 721         /* Request additional information from the BOOTP/DHCP server */
 722 #if defined(CONFIG_CMD_DHCP)
 723         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
 724                                zero_ip);
 725 #else
 726         extlen = bootp_extended((u8 *)bp->bp_vend);
 727 #endif
 728
 729         /*
 730          *      Bootp ID is the lower 4 bytes of our ethernet address
 731          *      plus the current time in ms.
 732          */
 733         BootpID = ((ulong)NetOurEther[2] << 24)
 734                 | ((ulong)NetOurEther[3] << 16)
 735                 | ((ulong)NetOurEther[4] << 8)
 736                 | (ulong)NetOurEther[5];
 737         BootpID += get_timer(0);
 738         BootpID = htonl(BootpID);
 739         bootp_add_id(BootpID);
 740         NetCopyLong(&bp->bp_id, &BootpID);
 741
 742         /*
 743          * Calculate proper packet lengths taking into account the
 744          * variable size of the options field
 745          */
 746         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 747         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 748         bcast_ip.s_addr = 0xFFFFFFFFL;
 749         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 750         NetSetTimeout(bootp_timeout, BootpTimeout);
 751
 752 #if defined(CONFIG_CMD_DHCP)
 753         dhcp_state = SELECTING;
 754         net_set_udp_handler(dhcp_handler);
 755 #else
 756         net_set_udp_handler(bootp_handler);
 757 #endif
 758         NetSendPacket(NetTxPacket, pktlen);
 759 }
 760
 761 #if defined(CONFIG_CMD_DHCP)
 762 static void DhcpOptionsProcess(uchar *popt, struct Bootp_t *bp)
 763 {
 764         uchar *end = popt + BOOTP_HDR_SIZE;
 765         int oplen, size;
 766 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 767         int *to_ptr;
 768 #endif
 769
 770         while (popt < end && *popt != 0xff) {
 771                 oplen = *(popt + 1);
 772                 switch (*popt) {
 773                 case 1:
 774                         net_copy_ip(&net_netmask, (popt + 2));
 775                         break;
 776 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 777                 case 2:         /* Time offset  */
 778                         to_ptr = &NetTimeOffset;
 779                         NetCopyLong((ulong *)to_ptr, (ulong *)(popt + 2));
 780                         NetTimeOffset = ntohl(NetTimeOffset);
 781                         break;
 782 #endif
 783                 case 3:
 784                         net_copy_ip(&net_gateway, (popt + 2));
 785                         break;
 786                 case 6:
 787                         net_copy_ip(&net_dns_server, (popt + 2));
 788 #if defined(CONFIG_BOOTP_DNS2)
 789                         if (*(popt + 1) > 4)
 790                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
 791 #endif
 792                         break;
 793                 case 12:
 794                         size = truncate_sz("Host Name",
 795                                 sizeof(NetOurHostName), oplen);
 796                         memcpy(&NetOurHostName, popt + 2, size);
 797                         NetOurHostName[size] = 0;
 798                         break;
 799                 case 15:        /* Ignore Domain Name Option */
 800                         break;
 801                 case 17:
 802                         size = truncate_sz("Root Path",
 803                                 sizeof(NetOurRootPath), oplen);
 804                         memcpy(&NetOurRootPath, popt + 2, size);
 805                         NetOurRootPath[size] = 0;
 806                         break;
 807                 case 28:        /* Ignore Broadcast Address Option */
 808                         break;
 809 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 810                 case 42:        /* NTP server IP */
 811                         net_copy_ip(&net_ntp_server, (popt + 2));
 812                         break;
 813 #endif
 814                 case 51:
 815                         NetCopyLong(&dhcp_leasetime, (ulong *) (popt + 2));
 816                         break;
 817                 case 53:        /* Ignore Message Type Option */
 818                         break;
 819                 case 54:
 820                         net_copy_ip(&dhcp_server_ip, (popt + 2));
 821                         break;
 822                 case 58:        /* Ignore Renewal Time Option */
 823                         break;
 824                 case 59:        /* Ignore Rebinding Time Option */
 825                         break;
 826                 case 66:        /* Ignore TFTP server name */
 827                         break;
 828                 case 67:        /* vendor opt bootfile */
 829                         /*
 830                          * I can't use dhcp_vendorex_proc here because I need
 831                          * to write into the bootp packet - even then I had to
 832                          * pass the bootp packet pointer into here as the
 833                          * second arg
 834                          */
 835                         size = truncate_sz("Opt Boot File",
 836                                             sizeof(bp->bp_file),
 837                                             oplen);
 838                         if (bp->bp_file[0] == '\0' && size > 0) {
 839                                 /*
 840                                  * only use vendor boot file if we didn't
 841                                  * receive a boot file in the main non-vendor
 842                                  * part of the packet - god only knows why
 843                                  * some vendors chose not to use this perfectly
 844                                  * good spot to store the boot file (join on
 845                                  * Tru64 Unix) it seems mind bogglingly crazy
 846                                  * to me
 847                                  */
 848                                 printf("*** WARNING: using vendor "
 849                                         "optional boot file\n");
 850                                 memcpy(bp->bp_file, popt + 2, size);
 851                                 bp->bp_file[size] = '\0';
 852                         }
 853                         break;
 854                 default:
 855 #if defined(CONFIG_BOOTP_VENDOREX)
 856                         if (dhcp_vendorex_proc(popt))
 857                                 break;
 858 #endif
 859                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
 860                                 " %d\n", *popt);
 861                         break;
 862                 }
 863                 popt += oplen + 2;      /* Process next option */
 864         }
 865 }
 866
 867 static int DhcpMessageType(unsigned char *popt)
 868 {
 869         if (NetReadLong((ulong *)popt) != htonl(BOOTP_VENDOR_MAGIC))
 870                 return -1;
 871
 872         popt += 4;
 873         while (*popt != 0xff) {
 874                 if (*popt == 53)        /* DHCP Message Type */
 875                         return *(popt + 2);
 876                 popt += *(popt + 1) + 2;        /* Scan through all options */
 877         }
 878         return -1;
 879 }
 880
 881 static void DhcpSendRequestPkt(struct Bootp_t *bp_offer)
 882 {
 883         uchar *pkt, *iphdr;
 884         struct Bootp_t *bp;
 885         int pktlen, iplen, extlen;
 886         int eth_hdr_size;
 887         struct in_addr offered_ip;
 888         struct in_addr zero_ip;
 889         struct in_addr bcast_ip;
 890
 891         debug("DhcpSendRequestPkt: Sending DHCPREQUEST\n");
 892         pkt = NetTxPacket;
 893         memset((void *)pkt, 0, PKTSIZE);
 894
 895         eth_hdr_size = NetSetEther(pkt, NetBcastAddr, PROT_IP);
 896         pkt += eth_hdr_size;
 897
 898         iphdr = pkt;    /* We'll need this later to set proper pkt size */
 899         pkt += IP_UDP_HDR_SIZE;
 900
 901         bp = (struct Bootp_t *)pkt;
 902         bp->bp_op = OP_BOOTREQUEST;
 903         bp->bp_htype = HWT_ETHER;
 904         bp->bp_hlen = HWL_ETHER;
 905         bp->bp_hops = 0;
 906         bp->bp_secs = htons(get_timer(0) / 1000);
 907         /* Do not set the client IP, your IP, or server IP yet, since it
 908          * hasn't been ACK'ed by the server yet */
 909
 910         /*
 911          * RFC3046 requires Relay Agents to discard packets with
 912          * nonzero and offered giaddr
 913          */
 914         zero_ip.s_addr = 0;
 915         net_write_ip(&bp->bp_giaddr, zero_ip);
 916
 917         memcpy(bp->bp_chaddr, NetOurEther, 6);
 918
 919         /*
 920          * ID is the id of the OFFER packet
 921          */
 922
 923         NetCopyLong(&bp->bp_id, &bp_offer->bp_id);
 924
 925         /*
 926          * Copy options from OFFER packet if present
 927          */
 928
 929         /* Copy offered IP into the parameters request list */
 930         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
 931         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
 932                 dhcp_server_ip, offered_ip);
 933
 934         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 935         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 936         bcast_ip.s_addr = 0xFFFFFFFFL;
 937         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 938
 939 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 940         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 941 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 942         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 943         NetSendPacket(NetTxPacket, pktlen);
 944 }
 945
 946 /*
 947  *      Handle DHCP received packets.
 948  */
 949 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 950                          unsigned src, unsigned len)
 951 {
 952         struct Bootp_t *bp = (struct Bootp_t *)pkt;
 953
 954         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 955                 src, dest, len, dhcp_state);
 956
 957         /* Filter out pkts we don't want */
 958         if (BootpCheckPkt(pkt, dest, src, len))
 959                 return;
 960
 961         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state:"
 962                 " %d\n", src, dest, len, dhcp_state);
 963
 964         switch (dhcp_state) {
 965         case SELECTING:
 966                 /*
 967                  * Wait an appropriate time for any potential DHCPOFFER packets
 968                  * to arrive.  Then select one, and generate DHCPREQUEST
 969                  * response.  If filename is in format we recognize, assume it
 970                  * is a valid OFFER from a server we want.
 971                  */
 972                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
 973 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 974                 if (strncmp(bp->bp_file,
 975                             CONFIG_SYS_BOOTFILE_PREFIX,
 976                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
 977 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 978
 979                         debug("TRANSITIONING TO REQUESTING STATE\n");
 980                         dhcp_state = REQUESTING;
 981
 982                         if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
 983                                                 htonl(BOOTP_VENDOR_MAGIC))
 984                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
 985
 986                         NetSetTimeout(5000, BootpTimeout);
 987                         DhcpSendRequestPkt(bp);
 988 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
 989                 }
 990 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
 991
 992                 return;
 993                 break;
 994         case REQUESTING:
 995                 debug("DHCP State: REQUESTING\n");
 996
 997                 if (DhcpMessageType((u8 *)bp->bp_vend) == DHCP_ACK) {
 998                         if (NetReadLong((ulong *)&bp->bp_vend[0]) ==
 999                                                 htonl(BOOTP_VENDOR_MAGIC))
1000                                 DhcpOptionsProcess((u8 *)&bp->bp_vend[4], bp);
1001                         /* Store net params from reply */
1002                         BootpCopyNetParams(bp);
1003                         dhcp_state = BOUND;
1004                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1005                                 &net_ip, get_timer(bootp_start));
1006                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1007                                 "bootp_stop");
1008
1009                         net_auto_load();
1010                         return;
1011                 }
1012                 break;
1013         case BOUND:
1014                 /* DHCP client bound to address */
1015                 break;
1016         default:
1017                 puts("DHCP: INVALID STATE\n");
1018                 break;
1019         }
1020
1021 }
1022
1023 void DhcpRequest(void)
1024 {
1025         BootpRequest();
1026 }
1027 #endif  /* CONFIG_CMD_DHCP */