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 <net/tftp.h>
  15 #include "bootp.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 u32             bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
  55 unsigned int    bootp_num_ids;
  56 int             bootp_try;
  57 ulong           bootp_start;
  58 ulong           bootp_timeout;
  59 char net_nis_domain[32] = {0,}; /* Our NIS domain */
  60 char net_hostname[32] = {0,}; /* Our hostname */
  61 char net_root_path[64] = {0,}; /* Our bootpath */
  62
  63 #if defined(CONFIG_CMD_DHCP)
  64 static dhcp_state_t dhcp_state = INIT;
  65 static u32 dhcp_leasetime;
  66 static struct in_addr dhcp_server_ip;
  67 static u8 dhcp_option_overload;
  68 #define OVERLOAD_FILE 1
  69 #define OVERLOAD_SNAME 2
  70 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
  71                         unsigned src, unsigned len);
  72
  73 /* For Debug */
  74 #if 0
  75 static char *dhcpmsg2str(int type)
  76 {
  77         switch (type) {
  78         case 1:  return "DHCPDISCOVER"; break;
  79         case 2:  return "DHCPOFFER";    break;
  80         case 3:  return "DHCPREQUEST";  break;
  81         case 4:  return "DHCPDECLINE";  break;
  82         case 5:  return "DHCPACK";      break;
  83         case 6:  return "DHCPNACK";     break;
  84         case 7:  return "DHCPRELEASE";  break;
  85         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  86         }
  87 }
  88 #endif
  89 #endif
  90
  91 static void bootp_add_id(ulong id)
  92 {
  93         if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
  94                 size_t size = sizeof(bootp_ids) - sizeof(id);
  95
  96                 memmove(bootp_ids, &bootp_ids[1], size);
  97                 bootp_ids[bootp_num_ids - 1] = id;
  98         } else {
  99                 bootp_ids[bootp_num_ids] = id;
 100                 bootp_num_ids++;
 101         }
 102 }
 103
 104 static bool bootp_match_id(ulong id)
 105 {
 106         unsigned int i;
 107
 108         for (i = 0; i < bootp_num_ids; i++)
 109                 if (bootp_ids[i] == id)
 110                         return true;
 111
 112         return false;
 113 }
 114
 115 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
 116                               unsigned len)
 117 {
 118         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
 119         int retval = 0;
 120
 121         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
 122                 retval = -1;
 123         else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
 124                 retval = -2;
 125         else if (bp->bp_op != OP_BOOTREPLY)
 126                 retval = -3;
 127         else if (bp->bp_htype != HWT_ETHER)
 128                 retval = -4;
 129         else if (bp->bp_hlen != HWL_ETHER)
 130                 retval = -5;
 131         else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
 132                 retval = -6;
 133
 134         debug("Filtering pkt = %d\n", retval);
 135
 136         return retval;
 137 }
 138
 139 /*
 140  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 141  */
 142 static void store_net_params(struct bootp_hdr *bp)
 143 {
 144 #if !defined(CONFIG_BOOTP_SERVERIP)
 145         struct in_addr tmp_ip;
 146
 147         net_copy_ip(&tmp_ip, &bp->bp_siaddr);
 148         if (tmp_ip.s_addr != 0)
 149                 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
 150         memcpy(net_server_ethaddr,
 151                ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
 152         if (
 153 #if defined(CONFIG_CMD_DHCP)
 154             !(dhcp_option_overload & OVERLOAD_FILE) &&
 155 #endif
 156             (strlen(bp->bp_file) > 0)) {
 157                 copy_filename(net_boot_file_name, bp->bp_file,
 158                               sizeof(net_boot_file_name));
 159         }
 160
 161         debug("net_boot_file_name: %s\n", net_boot_file_name);
 162
 163         /* Propagate to environment:
 164          * don't delete exising entry when BOOTP / DHCP reply does
 165          * not contain a new value
 166          */
 167         if (*net_boot_file_name)
 168                 setenv("bootfile", net_boot_file_name);
 169 #endif
 170         net_copy_ip(&net_ip, &bp->bp_yiaddr);
 171 }
 172
 173 static int truncate_sz(const char *name, int maxlen, int curlen)
 174 {
 175         if (curlen >= maxlen) {
 176                 printf("*** WARNING: %s is too long (%d - max: %d)"
 177                         " - truncated\n", name, curlen, maxlen);
 178                 curlen = maxlen - 1;
 179         }
 180         return curlen;
 181 }
 182
 183 #if !defined(CONFIG_CMD_DHCP)
 184
 185 static void bootp_process_vendor_field(u8 *ext)
 186 {
 187         int size = *(ext + 1);
 188
 189         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 190               *(ext + 1));
 191
 192         net_boot_file_expected_size_in_blocks = 0;
 193
 194         switch (*ext) {
 195                 /* Fixed length fields */
 196         case 1:                 /* Subnet mask */
 197                 if (net_netmask.s_addr == 0)
 198                         net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
 199                 break;
 200         case 2:                 /* Time offset - Not yet supported */
 201                 break;
 202                 /* Variable length fields */
 203         case 3:                 /* Gateways list */
 204                 if (net_gateway.s_addr == 0)
 205                         net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
 206                 break;
 207         case 4:                 /* Time server - Not yet supported */
 208                 break;
 209         case 5:                 /* IEN-116 name server - Not yet supported */
 210                 break;
 211         case 6:
 212                 if (net_dns_server.s_addr == 0)
 213                         net_copy_ip(&net_dns_server,
 214                                     (struct in_addr *)(ext + 2));
 215 #if defined(CONFIG_BOOTP_DNS2)
 216                 if ((net_dns_server2.s_addr == 0) && (size > 4))
 217                         net_copy_ip(&net_dns_server2,
 218                                     (struct in_addr *)(ext + 2 + 4));
 219 #endif
 220                 break;
 221         case 7:                 /* Log server - Not yet supported */
 222                 break;
 223         case 8:                 /* Cookie/Quote server - Not yet supported */
 224                 break;
 225         case 9:                 /* LPR server - Not yet supported */
 226                 break;
 227         case 10:                /* Impress server - Not yet supported */
 228                 break;
 229         case 11:                /* RPL server - Not yet supported */
 230                 break;
 231         case 12:                /* Host name */
 232                 if (net_hostname[0] == 0) {
 233                         size = truncate_sz("Host Name",
 234                                 sizeof(net_hostname), size);
 235                         memcpy(&net_hostname, ext + 2, size);
 236                         net_hostname[size] = 0;
 237                 }
 238                 break;
 239         case 13:                /* Boot file size */
 240                 if (size == 2)
 241                         net_boot_file_expected_size_in_blocks =
 242                                 ntohs(*(ushort *)(ext + 2));
 243                 else if (size == 4)
 244                         net_boot_file_expected_size_in_blocks =
 245                                 ntohl(*(ulong *)(ext + 2));
 246                 break;
 247         case 14:                /* Merit dump file - Not yet supported */
 248                 break;
 249         case 15:                /* Domain name - Not yet supported */
 250                 break;
 251         case 16:                /* Swap server - Not yet supported */
 252                 break;
 253         case 17:                /* Root path */
 254                 if (net_root_path[0] == 0) {
 255                         size = truncate_sz("Root Path",
 256                                 sizeof(net_root_path), size);
 257                         memcpy(&net_root_path, ext + 2, size);
 258                         net_root_path[size] = 0;
 259                 }
 260                 break;
 261         case 18:                /* Extension path - Not yet supported */
 262                 /*
 263                  * This can be used to send the information of the
 264                  * vendor area in another file that the client can
 265                  * access via TFTP.
 266                  */
 267                 break;
 268                 /* IP host layer fields */
 269         case 40:                /* NIS Domain name */
 270                 if (net_nis_domain[0] == 0) {
 271                         size = truncate_sz("NIS Domain Name",
 272                                 sizeof(net_nis_domain), size);
 273                         memcpy(&net_nis_domain, ext + 2, size);
 274                         net_nis_domain[size] = 0;
 275                 }
 276                 break;
 277 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 278         case 42:        /* NTP server IP */
 279                 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
 280                 break;
 281 #endif
 282                 /* Application layer fields */
 283         case 43:                /* Vendor specific info - Not yet supported */
 284                 /*
 285                  * Binary information to exchange specific
 286                  * product information.
 287                  */
 288                 break;
 289                 /* Reserved (custom) fields (128..254) */
 290         }
 291 }
 292
 293 static void bootp_process_vendor(u8 *ext, int size)
 294 {
 295         u8 *end = ext + size;
 296
 297         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 298
 299         while ((ext < end) && (*ext != 0xff)) {
 300                 if (*ext == 0) {
 301                         ext++;
 302                 } else {
 303                         u8 *opt = ext;
 304
 305                         ext += ext[1] + 2;
 306                         if (ext <= end)
 307                                 bootp_process_vendor_field(opt);
 308                 }
 309         }
 310
 311         debug("[BOOTP] Received fields:\n");
 312         if (net_netmask.s_addr)
 313                 debug("net_netmask : %pI4\n", &net_netmask);
 314
 315         if (net_gateway.s_addr)
 316                 debug("net_gateway      : %pI4", &net_gateway);
 317
 318         if (net_boot_file_expected_size_in_blocks)
 319                 debug("net_boot_file_expected_size_in_blocks : %d\n",
 320                       net_boot_file_expected_size_in_blocks);
 321
 322         if (net_hostname[0])
 323                 debug("net_hostname  : %s\n", net_hostname);
 324
 325         if (net_root_path[0])
 326                 debug("net_root_path  : %s\n", net_root_path);
 327
 328         if (net_nis_domain[0])
 329                 debug("net_nis_domain : %s\n", net_nis_domain);
 330
 331 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 332         if (net_ntp_server)
 333                 debug("net_ntp_server : %pI4\n", &net_ntp_server);
 334 #endif
 335 }
 336
 337 /*
 338  *      Handle a BOOTP received packet.
 339  */
 340 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 341                           unsigned src, unsigned len)
 342 {
 343         struct bootp_hdr *bp;
 344
 345         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 346               src, dest, len, sizeof(struct bootp_hdr));
 347
 348         bp = (struct bootp_hdr *)pkt;
 349
 350         /* Filter out pkts we don't want */
 351         if (check_reply_packet(pkt, dest, src, len))
 352                 return;
 353
 354         /*
 355          *      Got a good BOOTP reply.  Copy the data into our variables.
 356          */
 357 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT)
 358         status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
 359 #endif
 360
 361         store_net_params(bp);           /* Store net parameters from reply */
 362
 363         /* Retrieve extended information (we must parse the vendor area) */
 364         if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 365                 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
 366
 367         net_set_timeout_handler(0, (thand_f *)0);
 368         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
 369
 370         debug("Got good BOOTP\n");
 371
 372         net_auto_load();
 373 }
 374 #endif
 375
 376 /*
 377  *      Timeout on BOOTP/DHCP request.
 378  */
 379 static void bootp_timeout_handler(void)
 380 {
 381         ulong time_taken = get_timer(bootp_start);
 382
 383         if (time_taken >= TIMEOUT_MS) {
 384 #ifdef CONFIG_BOOTP_MAY_FAIL
 385                 puts("\nRetry time exceeded\n");
 386                 net_set_state(NETLOOP_FAIL);
 387 #else
 388                 puts("\nRetry time exceeded; starting again\n");
 389                 net_start_again();
 390 #endif
 391         } else {
 392                 bootp_timeout *= 2;
 393                 if (bootp_timeout > 2000)
 394                         bootp_timeout = 2000;
 395                 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 396                 bootp_request();
 397         }
 398 }
 399
 400 #define put_vci(e, str)                                         \
 401         do {                                                    \
 402                 size_t vci_strlen = strlen(str);                \
 403                 *e++ = 60;      /* Vendor Class Identifier */   \
 404                 *e++ = vci_strlen;                              \
 405                 memcpy(e, str, vci_strlen);                     \
 406                 e += vci_strlen;                                \
 407         } while (0)
 408
 409 /*
 410  *      Initialize BOOTP extension fields in the request.
 411  */
 412 #if defined(CONFIG_CMD_DHCP)
 413 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
 414                         struct in_addr requested_ip)
 415 {
 416         u8 *start = e;
 417         u8 *cnt;
 418 #if defined(CONFIG_BOOTP_PXE)
 419         char *uuid;
 420         u16 clientarch;
 421 #endif
 422
 423 #if defined(CONFIG_BOOTP_VENDOREX)
 424         u8 *x;
 425 #endif
 426 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 427         char *hostname;
 428 #endif
 429
 430         *e++ = 99;              /* RFC1048 Magic Cookie */
 431         *e++ = 130;
 432         *e++ = 83;
 433         *e++ = 99;
 434
 435         *e++ = 53;              /* DHCP Message Type */
 436         *e++ = 1;
 437         *e++ = message_type;
 438
 439         *e++ = 57;              /* Maximum DHCP Message Size */
 440         *e++ = 2;
 441         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
 442         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 443
 444         if (server_ip.s_addr) {
 445                 int tmp = ntohl(server_ip.s_addr);
 446
 447                 *e++ = 54;      /* ServerID */
 448                 *e++ = 4;
 449                 *e++ = tmp >> 24;
 450                 *e++ = tmp >> 16;
 451                 *e++ = tmp >> 8;
 452                 *e++ = tmp & 0xff;
 453         }
 454
 455         if (requested_ip.s_addr) {
 456                 int tmp = ntohl(requested_ip.s_addr);
 457
 458                 *e++ = 50;      /* Requested IP */
 459                 *e++ = 4;
 460                 *e++ = tmp >> 24;
 461                 *e++ = tmp >> 16;
 462                 *e++ = tmp >> 8;
 463                 *e++ = tmp & 0xff;
 464         }
 465 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 466         hostname = getenv("hostname");
 467         if (hostname) {
 468                 int hostnamelen = strlen(hostname);
 469
 470                 *e++ = 12;      /* Hostname */
 471                 *e++ = hostnamelen;
 472                 memcpy(e, hostname, hostnamelen);
 473                 e += hostnamelen;
 474         }
 475 #endif
 476
 477 #if defined(CONFIG_BOOTP_PXE)
 478         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 479         *e++ = 93;      /* Client System Architecture */
 480         *e++ = 2;
 481         *e++ = (clientarch >> 8) & 0xff;
 482         *e++ = clientarch & 0xff;
 483
 484         *e++ = 94;      /* Client Network Interface Identifier */
 485         *e++ = 3;
 486         *e++ = 1;       /* type field for UNDI */
 487         *e++ = 0;       /* major revision */
 488         *e++ = 0;       /* minor revision */
 489
 490         uuid = getenv("pxeuuid");
 491
 492         if (uuid) {
 493                 if (uuid_str_valid(uuid)) {
 494                         *e++ = 97;      /* Client Machine Identifier */
 495                         *e++ = 17;
 496                         *e++ = 0;       /* type 0 - UUID */
 497
 498                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
 499                         e += 16;
 500                 } else {
 501                         printf("Invalid pxeuuid: %s\n", uuid);
 502                 }
 503         }
 504 #endif
 505
 506 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
 507         put_vci(e, CONFIG_SPL_NET_VCI_STRING);
 508 #elif defined(CONFIG_BOOTP_VCI_STRING)
 509         put_vci(e, CONFIG_BOOTP_VCI_STRING);
 510 #endif
 511
 512 #if defined(CONFIG_BOOTP_VENDOREX)
 513         x = dhcp_vendorex_prep(e);
 514         if (x)
 515                 return x - start;
 516 #endif
 517
 518         *e++ = 55;              /* Parameter Request List */
 519          cnt = e++;             /* Pointer to count of requested items */
 520         *cnt = 0;
 521 #if defined(CONFIG_BOOTP_SUBNETMASK)
 522         *e++  = 1;              /* Subnet Mask */
 523         *cnt += 1;
 524 #endif
 525 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 526         *e++  = 2;
 527         *cnt += 1;
 528 #endif
 529 #if defined(CONFIG_BOOTP_GATEWAY)
 530         *e++  = 3;              /* Router Option */
 531         *cnt += 1;
 532 #endif
 533 #if defined(CONFIG_BOOTP_DNS)
 534         *e++  = 6;              /* DNS Server(s) */
 535         *cnt += 1;
 536 #endif
 537 #if defined(CONFIG_BOOTP_HOSTNAME)
 538         *e++  = 12;             /* Hostname */
 539         *cnt += 1;
 540 #endif
 541 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 542         *e++  = 13;             /* Boot File Size */
 543         *cnt += 1;
 544 #endif
 545 #if defined(CONFIG_BOOTP_BOOTPATH)
 546         *e++  = 17;             /* Boot path */
 547         *cnt += 1;
 548 #endif
 549 #if defined(CONFIG_BOOTP_NISDOMAIN)
 550         *e++  = 40;             /* NIS Domain name request */
 551         *cnt += 1;
 552 #endif
 553 #if defined(CONFIG_BOOTP_NTPSERVER)
 554         *e++  = 42;
 555         *cnt += 1;
 556 #endif
 557         /* no options, so back up to avoid sending an empty request list */
 558         if (*cnt == 0)
 559                 e -= 2;
 560
 561         *e++  = 255;            /* End of the list */
 562
 563         /* Pad to minimal length */
 564 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 565         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 566                 *e++ = 0;
 567 #endif
 568
 569         return e - start;
 570 }
 571
 572 #else
 573 /*
 574  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 575  */
 576 static int bootp_extended(u8 *e)
 577 {
 578         u8 *start = e;
 579
 580         *e++ = 99;              /* RFC1048 Magic Cookie */
 581         *e++ = 130;
 582         *e++ = 83;
 583         *e++ = 99;
 584
 585 #if defined(CONFIG_CMD_DHCP)
 586         *e++ = 53;              /* DHCP Message Type */
 587         *e++ = 1;
 588         *e++ = DHCP_DISCOVER;
 589
 590         *e++ = 57;              /* Maximum DHCP Message Size */
 591         *e++ = 2;
 592         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
 593         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 594 #endif
 595
 596 #if defined(CONFIG_BOOTP_VCI_STRING) || \
 597         (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
 598 #ifdef CONFIG_SPL_BUILD
 599         put_vci(e, CONFIG_SPL_NET_VCI_STRING);
 600 #else
 601         put_vci(e, CONFIG_BOOTP_VCI_STRING);
 602 #endif
 603 #endif
 604
 605 #if defined(CONFIG_BOOTP_SUBNETMASK)
 606         *e++ = 1;               /* Subnet mask request */
 607         *e++ = 4;
 608         e   += 4;
 609 #endif
 610
 611 #if defined(CONFIG_BOOTP_GATEWAY)
 612         *e++ = 3;               /* Default gateway request */
 613         *e++ = 4;
 614         e   += 4;
 615 #endif
 616
 617 #if defined(CONFIG_BOOTP_DNS)
 618         *e++ = 6;               /* Domain Name Server */
 619         *e++ = 4;
 620         e   += 4;
 621 #endif
 622
 623 #if defined(CONFIG_BOOTP_HOSTNAME)
 624         *e++ = 12;              /* Host name request */
 625         *e++ = 32;
 626         e   += 32;
 627 #endif
 628
 629 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 630         *e++ = 13;              /* Boot file size */
 631         *e++ = 2;
 632         e   += 2;
 633 #endif
 634
 635 #if defined(CONFIG_BOOTP_BOOTPATH)
 636         *e++ = 17;              /* Boot path */
 637         *e++ = 32;
 638         e   += 32;
 639 #endif
 640
 641 #if defined(CONFIG_BOOTP_NISDOMAIN)
 642         *e++ = 40;              /* NIS Domain name request */
 643         *e++ = 32;
 644         e   += 32;
 645 #endif
 646 #if defined(CONFIG_BOOTP_NTPSERVER)
 647         *e++ = 42;
 648         *e++ = 4;
 649         e   += 4;
 650 #endif
 651
 652         *e++ = 255;             /* End of the list */
 653
 654         return e - start;
 655 }
 656 #endif
 657
 658 void bootp_reset(void)
 659 {
 660         bootp_num_ids = 0;
 661         bootp_try = 0;
 662         bootp_start = get_timer(0);
 663         bootp_timeout = 250;
 664 }
 665
 666 void bootp_request(void)
 667 {
 668         uchar *pkt, *iphdr;
 669         struct bootp_hdr *bp;
 670         int extlen, pktlen, iplen;
 671         int eth_hdr_size;
 672 #ifdef CONFIG_BOOTP_RANDOM_DELAY
 673         ulong rand_ms;
 674 #endif
 675         u32 bootp_id;
 676         struct in_addr zero_ip;
 677         struct in_addr bcast_ip;
 678
 679         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 680 #if defined(CONFIG_CMD_DHCP)
 681         dhcp_state = INIT;
 682 #endif
 683
 684 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 685         if (bootp_try == 0)
 686                 srand_mac();
 687
 688         if (bootp_try <= 2)     /* Start with max 1024 * 1ms */
 689                 rand_ms = rand() >> (22 - bootp_try);
 690         else            /* After 3rd BOOTP request max 8192 * 1ms */
 691                 rand_ms = rand() >> 19;
 692
 693         printf("Random delay: %ld ms...\n", rand_ms);
 694         mdelay(rand_ms);
 695
 696 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 697
 698         printf("BOOTP broadcast %d\n", ++bootp_try);
 699         pkt = net_tx_packet;
 700         memset((void *)pkt, 0, PKTSIZE);
 701
 702         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 703         pkt += eth_hdr_size;
 704
 705         /*
 706          * Next line results in incorrect packet size being transmitted,
 707          * resulting in errors in some DHCP servers, reporting missing bytes.
 708          * Size must be set in packet header after extension length has been
 709          * determined.
 710          * C. Hallinan, DS4.COM, Inc.
 711          */
 712         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
 713                 sizeof (struct bootp_hdr)); */
 714         iphdr = pkt;    /* We need this later for net_set_udp_header() */
 715         pkt += IP_UDP_HDR_SIZE;
 716
 717         bp = (struct bootp_hdr *)pkt;
 718         bp->bp_op = OP_BOOTREQUEST;
 719         bp->bp_htype = HWT_ETHER;
 720         bp->bp_hlen = HWL_ETHER;
 721         bp->bp_hops = 0;
 722         /*
 723          * according to RFC1542, should be 0 on first request, secs since
 724          * first request otherwise
 725          */
 726         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 727         zero_ip.s_addr = 0;
 728         net_write_ip(&bp->bp_ciaddr, zero_ip);
 729         net_write_ip(&bp->bp_yiaddr, zero_ip);
 730         net_write_ip(&bp->bp_siaddr, zero_ip);
 731         net_write_ip(&bp->bp_giaddr, zero_ip);
 732         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 733         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 734
 735         /* Request additional information from the BOOTP/DHCP server */
 736 #if defined(CONFIG_CMD_DHCP)
 737         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
 738                                zero_ip);
 739 #else
 740         extlen = bootp_extended((u8 *)bp->bp_vend);
 741 #endif
 742
 743         /*
 744          *      Bootp ID is the lower 4 bytes of our ethernet address
 745          *      plus the current time in ms.
 746          */
 747         bootp_id = ((u32)net_ethaddr[2] << 24)
 748                 | ((u32)net_ethaddr[3] << 16)
 749                 | ((u32)net_ethaddr[4] << 8)
 750                 | (u32)net_ethaddr[5];
 751         bootp_id += get_timer(0);
 752         bootp_id = htonl(bootp_id);
 753         bootp_add_id(bootp_id);
 754         net_copy_u32(&bp->bp_id, &bootp_id);
 755
 756         /*
 757          * Calculate proper packet lengths taking into account the
 758          * variable size of the options field
 759          */
 760         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 761         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 762         bcast_ip.s_addr = 0xFFFFFFFFL;
 763         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 764         net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 765
 766 #if defined(CONFIG_CMD_DHCP)
 767         dhcp_state = SELECTING;
 768         net_set_udp_handler(dhcp_handler);
 769 #else
 770         net_set_udp_handler(bootp_handler);
 771 #endif
 772         net_send_packet(net_tx_packet, pktlen);
 773 }
 774
 775 #if defined(CONFIG_CMD_DHCP)
 776 static void dhcp_process_options(uchar *popt, uchar *end)
 777 {
 778         int oplen, size;
 779 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 780         int *to_ptr;
 781 #endif
 782
 783         while (popt < end && *popt != 0xff) {
 784                 oplen = *(popt + 1);
 785                 switch (*popt) {
 786                 case 0:
 787                         oplen = -1; /* Pad omits len byte */
 788                         break;
 789                 case 1:
 790                         net_copy_ip(&net_netmask, (popt + 2));
 791                         break;
 792 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 793                 case 2:         /* Time offset  */
 794                         to_ptr = &net_ntp_time_offset;
 795                         net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
 796                         net_ntp_time_offset = ntohl(net_ntp_time_offset);
 797                         break;
 798 #endif
 799                 case 3:
 800                         net_copy_ip(&net_gateway, (popt + 2));
 801                         break;
 802                 case 6:
 803                         net_copy_ip(&net_dns_server, (popt + 2));
 804 #if defined(CONFIG_BOOTP_DNS2)
 805                         if (*(popt + 1) > 4)
 806                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
 807 #endif
 808                         break;
 809                 case 12:
 810                         size = truncate_sz("Host Name",
 811                                 sizeof(net_hostname), oplen);
 812                         memcpy(&net_hostname, popt + 2, size);
 813                         net_hostname[size] = 0;
 814                         break;
 815                 case 15:        /* Ignore Domain Name Option */
 816                         break;
 817                 case 17:
 818                         size = truncate_sz("Root Path",
 819                                 sizeof(net_root_path), oplen);
 820                         memcpy(&net_root_path, popt + 2, size);
 821                         net_root_path[size] = 0;
 822                         break;
 823                 case 28:        /* Ignore Broadcast Address Option */
 824                         break;
 825 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 826                 case 42:        /* NTP server IP */
 827                         net_copy_ip(&net_ntp_server, (popt + 2));
 828                         break;
 829 #endif
 830                 case 51:
 831                         net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
 832                         break;
 833                 case 52:
 834                         dhcp_option_overload = popt[2];
 835                         break;
 836                 case 53:        /* Ignore Message Type Option */
 837                         break;
 838                 case 54:
 839                         net_copy_ip(&dhcp_server_ip, (popt + 2));
 840                         break;
 841                 case 58:        /* Ignore Renewal Time Option */
 842                         break;
 843                 case 59:        /* Ignore Rebinding Time Option */
 844                         break;
 845                 case 66:        /* Ignore TFTP server name */
 846                         break;
 847                 case 67:        /* Bootfile option */
 848                         size = truncate_sz("Bootfile",
 849                                            sizeof(net_boot_file_name), oplen);
 850                         memcpy(&net_boot_file_name, popt + 2, size);
 851                         net_boot_file_name[size] = 0;
 852                         break;
 853                 default:
 854 #if defined(CONFIG_BOOTP_VENDOREX)
 855                         if (dhcp_vendorex_proc(popt))
 856                                 break;
 857 #endif
 858                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
 859                                " %d\n", *popt);
 860                         break;
 861                 }
 862                 popt += oplen + 2;      /* Process next option */
 863         }
 864 }
 865
 866 static void dhcp_packet_process_options(struct bootp_hdr *bp)
 867 {
 868         uchar *popt = (uchar *)&bp->bp_vend[4];
 869         uchar *end = popt + BOOTP_HDR_SIZE;
 870
 871         if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
 872                 return;
 873
 874         dhcp_option_overload = 0;
 875
 876         /*
 877          * The 'options' field MUST be interpreted first, 'file' next,
 878          * 'sname' last.
 879          */
 880         dhcp_process_options(popt, end);
 881
 882         if (dhcp_option_overload & OVERLOAD_FILE) {
 883                 popt = (uchar *)bp->bp_file;
 884                 end = popt + sizeof(bp->bp_file);
 885                 dhcp_process_options(popt, end);
 886         }
 887
 888         if (dhcp_option_overload & OVERLOAD_SNAME) {
 889                 popt = (uchar *)bp->bp_sname;
 890                 end = popt + sizeof(bp->bp_sname);
 891                 dhcp_process_options(popt, end);
 892         }
 893 }
 894
 895 static int dhcp_message_type(unsigned char *popt)
 896 {
 897         if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
 898                 return -1;
 899
 900         popt += 4;
 901         while (*popt != 0xff) {
 902                 if (*popt == 53)        /* DHCP Message Type */
 903                         return *(popt + 2);
 904                 if (*popt == 0) {
 905                         /* Pad */
 906                         popt += 1;
 907                 } else {
 908                         /* Scan through all options */
 909                         popt += *(popt + 1) + 2;
 910                 }
 911         }
 912         return -1;
 913 }
 914
 915 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
 916 {
 917         uchar *pkt, *iphdr;
 918         struct bootp_hdr *bp;
 919         int pktlen, iplen, extlen;
 920         int eth_hdr_size;
 921         struct in_addr offered_ip;
 922         struct in_addr zero_ip;
 923         struct in_addr bcast_ip;
 924
 925         debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
 926         pkt = net_tx_packet;
 927         memset((void *)pkt, 0, PKTSIZE);
 928
 929         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 930         pkt += eth_hdr_size;
 931
 932         iphdr = pkt;    /* We'll need this later to set proper pkt size */
 933         pkt += IP_UDP_HDR_SIZE;
 934
 935         bp = (struct bootp_hdr *)pkt;
 936         bp->bp_op = OP_BOOTREQUEST;
 937         bp->bp_htype = HWT_ETHER;
 938         bp->bp_hlen = HWL_ETHER;
 939         bp->bp_hops = 0;
 940         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 941         /* Do not set the client IP, your IP, or server IP yet, since it
 942          * hasn't been ACK'ed by the server yet */
 943
 944         /*
 945          * RFC3046 requires Relay Agents to discard packets with
 946          * nonzero and offered giaddr
 947          */
 948         zero_ip.s_addr = 0;
 949         net_write_ip(&bp->bp_giaddr, zero_ip);
 950
 951         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 952
 953         /*
 954          * ID is the id of the OFFER packet
 955          */
 956
 957         net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
 958
 959         /*
 960          * Copy options from OFFER packet if present
 961          */
 962
 963         /* Copy offered IP into the parameters request list */
 964         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
 965         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
 966                 dhcp_server_ip, offered_ip);
 967
 968         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 969         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 970         bcast_ip.s_addr = 0xFFFFFFFFL;
 971         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 972
 973 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 974         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 975 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 976         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 977         net_send_packet(net_tx_packet, pktlen);
 978 }
 979
 980 /*
 981  *      Handle DHCP received packets.
 982  */
 983 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 984                          unsigned src, unsigned len)
 985 {
 986         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
 987
 988         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
 989               src, dest, len, dhcp_state);
 990
 991         /* Filter out pkts we don't want */
 992         if (check_reply_packet(pkt, dest, src, len))
 993                 return;
 994
 995         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
 996               "%d\n", src, dest, len, dhcp_state);
 997
 998         if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
 999                 return;
1000
1001         switch (dhcp_state) {
1002         case SELECTING:
1003                 /*
1004                  * Wait an appropriate time for any potential DHCPOFFER packets
1005                  * to arrive.  Then select one, and generate DHCPREQUEST
1006                  * response.  If filename is in format we recognize, assume it
1007                  * is a valid OFFER from a server we want.
1008                  */
1009                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1010 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1011                 if (strncmp(bp->bp_file,
1012                             CONFIG_SYS_BOOTFILE_PREFIX,
1013                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1014 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1015                         dhcp_packet_process_options(bp);
1016
1017                         debug("TRANSITIONING TO REQUESTING STATE\n");
1018                         dhcp_state = REQUESTING;
1019
1020                         net_set_timeout_handler(5000, bootp_timeout_handler);
1021                         dhcp_send_request_packet(bp);
1022 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1023                 }
1024 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1025
1026                 return;
1027                 break;
1028         case REQUESTING:
1029                 debug("DHCP State: REQUESTING\n");
1030
1031                 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1032                         dhcp_packet_process_options(bp);
1033                         /* Store net params from reply */
1034                         store_net_params(bp);
1035                         dhcp_state = BOUND;
1036                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1037                                &net_ip, get_timer(bootp_start));
1038                         net_set_timeout_handler(0, (thand_f *)0);
1039                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1040                                             "bootp_stop");
1041
1042                         net_auto_load();
1043                         return;
1044                 }
1045                 break;
1046         case BOUND:
1047                 /* DHCP client bound to address */
1048                 break;
1049         default:
1050                 puts("DHCP: INVALID STATE\n");
1051                 break;
1052         }
1053 }
1054
1055 void dhcp_request(void)
1056 {
1057         bootp_request();
1058 }
1059 #endif  /* CONFIG_CMD_DHCP */