git.sur5r.net Git - u-boot/blob - 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 <efi_loader.h>
  14 #include <net.h>
  15 #include <net/tftp.h>
  16 #include "bootp.h"
  17 #ifdef CONFIG_LED_STATUS
  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 static ulong time_taken_max;
  64
  65 #if defined(CONFIG_CMD_DHCP)
  66 static dhcp_state_t dhcp_state = INIT;
  67 static u32 dhcp_leasetime;
  68 static struct in_addr dhcp_server_ip;
  69 static u8 dhcp_option_overload;
  70 #define OVERLOAD_FILE 1
  71 #define OVERLOAD_SNAME 2
  72 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
  73                         unsigned src, unsigned len);
  74
  75 /* For Debug */
  76 #if 0
  77 static char *dhcpmsg2str(int type)
  78 {
  79         switch (type) {
  80         case 1:  return "DHCPDISCOVER"; break;
  81         case 2:  return "DHCPOFFER";    break;
  82         case 3:  return "DHCPREQUEST";  break;
  83         case 4:  return "DHCPDECLINE";  break;
  84         case 5:  return "DHCPACK";      break;
  85         case 6:  return "DHCPNACK";     break;
  86         case 7:  return "DHCPRELEASE";  break;
  87         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  88         }
  89 }
  90 #endif
  91 #endif
  92
  93 static void bootp_add_id(ulong id)
  94 {
  95         if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
  96                 size_t size = sizeof(bootp_ids) - sizeof(id);
  97
  98                 memmove(bootp_ids, &bootp_ids[1], size);
  99                 bootp_ids[bootp_num_ids - 1] = id;
 100         } else {
 101                 bootp_ids[bootp_num_ids] = id;
 102                 bootp_num_ids++;
 103         }
 104 }
 105
 106 static bool bootp_match_id(ulong id)
 107 {
 108         unsigned int i;
 109
 110         for (i = 0; i < bootp_num_ids; i++)
 111                 if (bootp_ids[i] == id)
 112                         return true;
 113
 114         return false;
 115 }
 116
 117 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
 118                               unsigned len)
 119 {
 120         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
 121         int retval = 0;
 122
 123         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
 124                 retval = -1;
 125         else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
 126                 retval = -2;
 127         else if (bp->bp_op != OP_BOOTREPLY)
 128                 retval = -3;
 129         else if (bp->bp_htype != HWT_ETHER)
 130                 retval = -4;
 131         else if (bp->bp_hlen != HWL_ETHER)
 132                 retval = -5;
 133         else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
 134                 retval = -6;
 135         else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
 136                 retval = -7;
 137
 138         debug("Filtering pkt = %d\n", retval);
 139
 140         return retval;
 141 }
 142
 143 /*
 144  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 145  */
 146 static void store_net_params(struct bootp_hdr *bp)
 147 {
 148 #if !defined(CONFIG_BOOTP_SERVERIP)
 149         struct in_addr tmp_ip;
 150
 151         net_copy_ip(&tmp_ip, &bp->bp_siaddr);
 152         if (tmp_ip.s_addr != 0)
 153                 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
 154         memcpy(net_server_ethaddr,
 155                ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
 156         if (
 157 #if defined(CONFIG_CMD_DHCP)
 158             !(dhcp_option_overload & OVERLOAD_FILE) &&
 159 #endif
 160             (strlen(bp->bp_file) > 0)) {
 161                 copy_filename(net_boot_file_name, bp->bp_file,
 162                               sizeof(net_boot_file_name));
 163         }
 164
 165         debug("net_boot_file_name: %s\n", net_boot_file_name);
 166
 167         /* Propagate to environment:
 168          * don't delete exising entry when BOOTP / DHCP reply does
 169          * not contain a new value
 170          */
 171         if (*net_boot_file_name)
 172                 env_set("bootfile", net_boot_file_name);
 173 #endif
 174         net_copy_ip(&net_ip, &bp->bp_yiaddr);
 175 }
 176
 177 static int truncate_sz(const char *name, int maxlen, int curlen)
 178 {
 179         if (curlen >= maxlen) {
 180                 printf("*** WARNING: %s is too long (%d - max: %d)"
 181                         " - truncated\n", name, curlen, maxlen);
 182                 curlen = maxlen - 1;
 183         }
 184         return curlen;
 185 }
 186
 187 #if !defined(CONFIG_CMD_DHCP)
 188
 189 static void bootp_process_vendor_field(u8 *ext)
 190 {
 191         int size = *(ext + 1);
 192
 193         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 194               *(ext + 1));
 195
 196         net_boot_file_expected_size_in_blocks = 0;
 197
 198         switch (*ext) {
 199                 /* Fixed length fields */
 200         case 1:                 /* Subnet mask */
 201                 if (net_netmask.s_addr == 0)
 202                         net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
 203                 break;
 204         case 2:                 /* Time offset - Not yet supported */
 205                 break;
 206                 /* Variable length fields */
 207         case 3:                 /* Gateways list */
 208                 if (net_gateway.s_addr == 0)
 209                         net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
 210                 break;
 211         case 4:                 /* Time server - Not yet supported */
 212                 break;
 213         case 5:                 /* IEN-116 name server - Not yet supported */
 214                 break;
 215         case 6:
 216                 if (net_dns_server.s_addr == 0)
 217                         net_copy_ip(&net_dns_server,
 218                                     (struct in_addr *)(ext + 2));
 219 #if defined(CONFIG_BOOTP_DNS2)
 220                 if ((net_dns_server2.s_addr == 0) && (size > 4))
 221                         net_copy_ip(&net_dns_server2,
 222                                     (struct in_addr *)(ext + 2 + 4));
 223 #endif
 224                 break;
 225         case 7:                 /* Log server - Not yet supported */
 226                 break;
 227         case 8:                 /* Cookie/Quote server - Not yet supported */
 228                 break;
 229         case 9:                 /* LPR server - Not yet supported */
 230                 break;
 231         case 10:                /* Impress server - Not yet supported */
 232                 break;
 233         case 11:                /* RPL server - Not yet supported */
 234                 break;
 235         case 12:                /* Host name */
 236                 if (net_hostname[0] == 0) {
 237                         size = truncate_sz("Host Name",
 238                                 sizeof(net_hostname), size);
 239                         memcpy(&net_hostname, ext + 2, size);
 240                         net_hostname[size] = 0;
 241                 }
 242                 break;
 243         case 13:                /* Boot file size */
 244                 if (size == 2)
 245                         net_boot_file_expected_size_in_blocks =
 246                                 ntohs(*(ushort *)(ext + 2));
 247                 else if (size == 4)
 248                         net_boot_file_expected_size_in_blocks =
 249                                 ntohl(*(ulong *)(ext + 2));
 250                 break;
 251         case 14:                /* Merit dump file - Not yet supported */
 252                 break;
 253         case 15:                /* Domain name - Not yet supported */
 254                 break;
 255         case 16:                /* Swap server - Not yet supported */
 256                 break;
 257         case 17:                /* Root path */
 258                 if (net_root_path[0] == 0) {
 259                         size = truncate_sz("Root Path",
 260                                 sizeof(net_root_path), size);
 261                         memcpy(&net_root_path, ext + 2, size);
 262                         net_root_path[size] = 0;
 263                 }
 264                 break;
 265         case 18:                /* Extension path - Not yet supported */
 266                 /*
 267                  * This can be used to send the information of the
 268                  * vendor area in another file that the client can
 269                  * access via TFTP.
 270                  */
 271                 break;
 272                 /* IP host layer fields */
 273         case 40:                /* NIS Domain name */
 274                 if (net_nis_domain[0] == 0) {
 275                         size = truncate_sz("NIS Domain Name",
 276                                 sizeof(net_nis_domain), size);
 277                         memcpy(&net_nis_domain, ext + 2, size);
 278                         net_nis_domain[size] = 0;
 279                 }
 280                 break;
 281 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 282         case 42:        /* NTP server IP */
 283                 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
 284                 break;
 285 #endif
 286                 /* Application layer fields */
 287         case 43:                /* Vendor specific info - Not yet supported */
 288                 /*
 289                  * Binary information to exchange specific
 290                  * product information.
 291                  */
 292                 break;
 293                 /* Reserved (custom) fields (128..254) */
 294         }
 295 }
 296
 297 static void bootp_process_vendor(u8 *ext, int size)
 298 {
 299         u8 *end = ext + size;
 300
 301         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 302
 303         while ((ext < end) && (*ext != 0xff)) {
 304                 if (*ext == 0) {
 305                         ext++;
 306                 } else {
 307                         u8 *opt = ext;
 308
 309                         ext += ext[1] + 2;
 310                         if (ext <= end)
 311                                 bootp_process_vendor_field(opt);
 312                 }
 313         }
 314
 315         debug("[BOOTP] Received fields:\n");
 316         if (net_netmask.s_addr)
 317                 debug("net_netmask : %pI4\n", &net_netmask);
 318
 319         if (net_gateway.s_addr)
 320                 debug("net_gateway      : %pI4", &net_gateway);
 321
 322         if (net_boot_file_expected_size_in_blocks)
 323                 debug("net_boot_file_expected_size_in_blocks : %d\n",
 324                       net_boot_file_expected_size_in_blocks);
 325
 326         if (net_hostname[0])
 327                 debug("net_hostname  : %s\n", net_hostname);
 328
 329         if (net_root_path[0])
 330                 debug("net_root_path  : %s\n", net_root_path);
 331
 332         if (net_nis_domain[0])
 333                 debug("net_nis_domain : %s\n", net_nis_domain);
 334
 335 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 336         if (net_ntp_server.s_addr)
 337                 debug("net_ntp_server : %pI4\n", &net_ntp_server);
 338 #endif
 339 }
 340
 341 /*
 342  *      Handle a BOOTP received packet.
 343  */
 344 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 345                           unsigned src, unsigned len)
 346 {
 347         struct bootp_hdr *bp;
 348
 349         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 350               src, dest, len, sizeof(struct bootp_hdr));
 351
 352         bp = (struct bootp_hdr *)pkt;
 353
 354         /* Filter out pkts we don't want */
 355         if (check_reply_packet(pkt, dest, src, len))
 356                 return;
 357
 358         /*
 359          *      Got a good BOOTP reply.  Copy the data into our variables.
 360          */
 361 #if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
 362         status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF);
 363 #endif
 364
 365         store_net_params(bp);           /* Store net parameters from reply */
 366
 367         /* Retrieve extended information (we must parse the vendor area) */
 368         if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 369                 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
 370
 371         net_set_timeout_handler(0, (thand_f *)0);
 372         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
 373
 374         debug("Got good BOOTP\n");
 375
 376         net_auto_load();
 377 }
 378 #endif
 379
 380 /*
 381  *      Timeout on BOOTP/DHCP request.
 382  */
 383 static void bootp_timeout_handler(void)
 384 {
 385         ulong time_taken = get_timer(bootp_start);
 386
 387         if (time_taken >= time_taken_max) {
 388 #ifdef CONFIG_BOOTP_MAY_FAIL
 389                 char *ethrotate;
 390
 391                 ethrotate = env_get("ethrotate");
 392                 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
 393                     net_restart_wrap) {
 394                         puts("\nRetry time exceeded\n");
 395                         net_set_state(NETLOOP_FAIL);
 396                 } else
 397 #endif
 398                 {
 399                         puts("\nRetry time exceeded; starting again\n");
 400                         net_start_again();
 401                 }
 402         } else {
 403                 bootp_timeout *= 2;
 404                 if (bootp_timeout > 2000)
 405                         bootp_timeout = 2000;
 406                 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 407                 bootp_request();
 408         }
 409 }
 410
 411 #define put_vci(e, str)                                         \
 412         do {                                                    \
 413                 size_t vci_strlen = strlen(str);                \
 414                 *e++ = 60;      /* Vendor Class Identifier */   \
 415                 *e++ = vci_strlen;                              \
 416                 memcpy(e, str, vci_strlen);                     \
 417                 e += vci_strlen;                                \
 418         } while (0)
 419
 420 static u8 *add_vci(u8 *e)
 421 {
 422         char *vci = NULL;
 423         char *env_vci = env_get("bootp_vci");
 424
 425 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
 426         vci = CONFIG_SPL_NET_VCI_STRING;
 427 #elif defined(CONFIG_BOOTP_VCI_STRING)
 428         vci = CONFIG_BOOTP_VCI_STRING;
 429 #endif
 430
 431         if (env_vci)
 432                 vci = env_vci;
 433
 434         if (vci)
 435                 put_vci(e, vci);
 436
 437         return e;
 438 }
 439
 440 /*
 441  *      Initialize BOOTP extension fields in the request.
 442  */
 443 #if defined(CONFIG_CMD_DHCP)
 444 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
 445                         struct in_addr requested_ip)
 446 {
 447         u8 *start = e;
 448         u8 *cnt;
 449 #ifdef CONFIG_LIB_UUID
 450         char *uuid;
 451 #endif
 452         int clientarch = -1;
 453
 454 #if defined(CONFIG_BOOTP_VENDOREX)
 455         u8 *x;
 456 #endif
 457 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 458         char *hostname;
 459 #endif
 460
 461         *e++ = 99;              /* RFC1048 Magic Cookie */
 462         *e++ = 130;
 463         *e++ = 83;
 464         *e++ = 99;
 465
 466         *e++ = 53;              /* DHCP Message Type */
 467         *e++ = 1;
 468         *e++ = message_type;
 469
 470         *e++ = 57;              /* Maximum DHCP Message Size */
 471         *e++ = 2;
 472         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
 473         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 474
 475         if (server_ip.s_addr) {
 476                 int tmp = ntohl(server_ip.s_addr);
 477
 478                 *e++ = 54;      /* ServerID */
 479                 *e++ = 4;
 480                 *e++ = tmp >> 24;
 481                 *e++ = tmp >> 16;
 482                 *e++ = tmp >> 8;
 483                 *e++ = tmp & 0xff;
 484         }
 485
 486         if (requested_ip.s_addr) {
 487                 int tmp = ntohl(requested_ip.s_addr);
 488
 489                 *e++ = 50;      /* Requested IP */
 490                 *e++ = 4;
 491                 *e++ = tmp >> 24;
 492                 *e++ = tmp >> 16;
 493                 *e++ = tmp >> 8;
 494                 *e++ = tmp & 0xff;
 495         }
 496 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 497         hostname = env_get("hostname");
 498         if (hostname) {
 499                 int hostnamelen = strlen(hostname);
 500
 501                 *e++ = 12;      /* Hostname */
 502                 *e++ = hostnamelen;
 503                 memcpy(e, hostname, hostnamelen);
 504                 e += hostnamelen;
 505         }
 506 #endif
 507
 508 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
 509         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 510 #endif
 511
 512         if (env_get("bootp_arch"))
 513                 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
 514
 515         if (clientarch > 0) {
 516                 *e++ = 93;      /* Client System Architecture */
 517                 *e++ = 2;
 518                 *e++ = (clientarch >> 8) & 0xff;
 519                 *e++ = clientarch & 0xff;
 520         }
 521
 522         *e++ = 94;      /* Client Network Interface Identifier */
 523         *e++ = 3;
 524         *e++ = 1;       /* type field for UNDI */
 525         *e++ = 0;       /* major revision */
 526         *e++ = 0;       /* minor revision */
 527
 528 #ifdef CONFIG_LIB_UUID
 529         uuid = env_get("pxeuuid");
 530
 531         if (uuid) {
 532                 if (uuid_str_valid(uuid)) {
 533                         *e++ = 97;      /* Client Machine Identifier */
 534                         *e++ = 17;
 535                         *e++ = 0;       /* type 0 - UUID */
 536
 537                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
 538                         e += 16;
 539                 } else {
 540                         printf("Invalid pxeuuid: %s\n", uuid);
 541                 }
 542         }
 543 #endif
 544
 545         e = add_vci(e);
 546
 547 #if defined(CONFIG_BOOTP_VENDOREX)
 548         x = dhcp_vendorex_prep(e);
 549         if (x)
 550                 return x - start;
 551 #endif
 552
 553         *e++ = 55;              /* Parameter Request List */
 554          cnt = e++;             /* Pointer to count of requested items */
 555         *cnt = 0;
 556 #if defined(CONFIG_BOOTP_SUBNETMASK)
 557         *e++  = 1;              /* Subnet Mask */
 558         *cnt += 1;
 559 #endif
 560 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 561         *e++  = 2;
 562         *cnt += 1;
 563 #endif
 564 #if defined(CONFIG_BOOTP_GATEWAY)
 565         *e++  = 3;              /* Router Option */
 566         *cnt += 1;
 567 #endif
 568 #if defined(CONFIG_BOOTP_DNS)
 569         *e++  = 6;              /* DNS Server(s) */
 570         *cnt += 1;
 571 #endif
 572 #if defined(CONFIG_BOOTP_HOSTNAME)
 573         *e++  = 12;             /* Hostname */
 574         *cnt += 1;
 575 #endif
 576 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 577         *e++  = 13;             /* Boot File Size */
 578         *cnt += 1;
 579 #endif
 580 #if defined(CONFIG_BOOTP_BOOTPATH)
 581         *e++  = 17;             /* Boot path */
 582         *cnt += 1;
 583 #endif
 584 #if defined(CONFIG_BOOTP_NISDOMAIN)
 585         *e++  = 40;             /* NIS Domain name request */
 586         *cnt += 1;
 587 #endif
 588 #if defined(CONFIG_BOOTP_NTPSERVER)
 589         *e++  = 42;
 590         *cnt += 1;
 591 #endif
 592         /* no options, so back up to avoid sending an empty request list */
 593         if (*cnt == 0)
 594                 e -= 2;
 595
 596         *e++  = 255;            /* End of the list */
 597
 598         /* Pad to minimal length */
 599 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 600         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 601                 *e++ = 0;
 602 #endif
 603
 604         return e - start;
 605 }
 606
 607 #else
 608 /*
 609  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 610  */
 611 static int bootp_extended(u8 *e)
 612 {
 613         u8 *start = e;
 614
 615         *e++ = 99;              /* RFC1048 Magic Cookie */
 616         *e++ = 130;
 617         *e++ = 83;
 618         *e++ = 99;
 619
 620 #if defined(CONFIG_CMD_DHCP)
 621         *e++ = 53;              /* DHCP Message Type */
 622         *e++ = 1;
 623         *e++ = DHCP_DISCOVER;
 624
 625         *e++ = 57;              /* Maximum DHCP Message Size */
 626         *e++ = 2;
 627         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
 628         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 629 #endif
 630
 631         add_vci(e);
 632
 633 #if defined(CONFIG_BOOTP_SUBNETMASK)
 634         *e++ = 1;               /* Subnet mask request */
 635         *e++ = 4;
 636         e   += 4;
 637 #endif
 638
 639 #if defined(CONFIG_BOOTP_GATEWAY)
 640         *e++ = 3;               /* Default gateway request */
 641         *e++ = 4;
 642         e   += 4;
 643 #endif
 644
 645 #if defined(CONFIG_BOOTP_DNS)
 646         *e++ = 6;               /* Domain Name Server */
 647         *e++ = 4;
 648         e   += 4;
 649 #endif
 650
 651 #if defined(CONFIG_BOOTP_HOSTNAME)
 652         *e++ = 12;              /* Host name request */
 653         *e++ = 32;
 654         e   += 32;
 655 #endif
 656
 657 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 658         *e++ = 13;              /* Boot file size */
 659         *e++ = 2;
 660         e   += 2;
 661 #endif
 662
 663 #if defined(CONFIG_BOOTP_BOOTPATH)
 664         *e++ = 17;              /* Boot path */
 665         *e++ = 32;
 666         e   += 32;
 667 #endif
 668
 669 #if defined(CONFIG_BOOTP_NISDOMAIN)
 670         *e++ = 40;              /* NIS Domain name request */
 671         *e++ = 32;
 672         e   += 32;
 673 #endif
 674 #if defined(CONFIG_BOOTP_NTPSERVER)
 675         *e++ = 42;
 676         *e++ = 4;
 677         e   += 4;
 678 #endif
 679
 680         *e++ = 255;             /* End of the list */
 681
 682         /*
 683          * If nothing in list, remove it altogether. Some DHCP servers get
 684          * upset by this minor faux pas and do not respond at all.
 685          */
 686         if (e == start + 3) {
 687                 printf("*** Warning: no DHCP options requested\n");
 688                 e -= 3;
 689         }
 690
 691         return e - start;
 692 }
 693 #endif
 694
 695 void bootp_reset(void)
 696 {
 697         bootp_num_ids = 0;
 698         bootp_try = 0;
 699         bootp_start = get_timer(0);
 700         bootp_timeout = 250;
 701 }
 702
 703 void bootp_request(void)
 704 {
 705         uchar *pkt, *iphdr;
 706         struct bootp_hdr *bp;
 707         int extlen, pktlen, iplen;
 708         int eth_hdr_size;
 709 #ifdef CONFIG_BOOTP_RANDOM_DELAY
 710         ulong rand_ms;
 711 #endif
 712         u32 bootp_id;
 713         struct in_addr zero_ip;
 714         struct in_addr bcast_ip;
 715         char *ep;  /* Environment pointer */
 716
 717         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 718 #if defined(CONFIG_CMD_DHCP)
 719         dhcp_state = INIT;
 720 #endif
 721
 722         ep = env_get("bootpretryperiod");
 723         if (ep != NULL)
 724                 time_taken_max = simple_strtoul(ep, NULL, 10);
 725         else
 726                 time_taken_max = TIMEOUT_MS;
 727
 728 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 729         if (bootp_try == 0)
 730                 srand_mac();
 731
 732         if (bootp_try <= 2)     /* Start with max 1024 * 1ms */
 733                 rand_ms = rand() >> (22 - bootp_try);
 734         else            /* After 3rd BOOTP request max 8192 * 1ms */
 735                 rand_ms = rand() >> 19;
 736
 737         printf("Random delay: %ld ms...\n", rand_ms);
 738         mdelay(rand_ms);
 739
 740 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 741
 742         printf("BOOTP broadcast %d\n", ++bootp_try);
 743         pkt = net_tx_packet;
 744         memset((void *)pkt, 0, PKTSIZE);
 745
 746         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 747         pkt += eth_hdr_size;
 748
 749         /*
 750          * Next line results in incorrect packet size being transmitted,
 751          * resulting in errors in some DHCP servers, reporting missing bytes.
 752          * Size must be set in packet header after extension length has been
 753          * determined.
 754          * C. Hallinan, DS4.COM, Inc.
 755          */
 756         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
 757                 sizeof (struct bootp_hdr)); */
 758         iphdr = pkt;    /* We need this later for net_set_udp_header() */
 759         pkt += IP_UDP_HDR_SIZE;
 760
 761         bp = (struct bootp_hdr *)pkt;
 762         bp->bp_op = OP_BOOTREQUEST;
 763         bp->bp_htype = HWT_ETHER;
 764         bp->bp_hlen = HWL_ETHER;
 765         bp->bp_hops = 0;
 766         /*
 767          * according to RFC1542, should be 0 on first request, secs since
 768          * first request otherwise
 769          */
 770         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 771         zero_ip.s_addr = 0;
 772         net_write_ip(&bp->bp_ciaddr, zero_ip);
 773         net_write_ip(&bp->bp_yiaddr, zero_ip);
 774         net_write_ip(&bp->bp_siaddr, zero_ip);
 775         net_write_ip(&bp->bp_giaddr, zero_ip);
 776         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 777         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 778
 779         /* Request additional information from the BOOTP/DHCP server */
 780 #if defined(CONFIG_CMD_DHCP)
 781         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
 782                                zero_ip);
 783 #else
 784         extlen = bootp_extended((u8 *)bp->bp_vend);
 785 #endif
 786
 787         /*
 788          *      Bootp ID is the lower 4 bytes of our ethernet address
 789          *      plus the current time in ms.
 790          */
 791         bootp_id = ((u32)net_ethaddr[2] << 24)
 792                 | ((u32)net_ethaddr[3] << 16)
 793                 | ((u32)net_ethaddr[4] << 8)
 794                 | (u32)net_ethaddr[5];
 795         bootp_id += get_timer(0);
 796         bootp_id = htonl(bootp_id);
 797         bootp_add_id(bootp_id);
 798         net_copy_u32(&bp->bp_id, &bootp_id);
 799
 800         /*
 801          * Calculate proper packet lengths taking into account the
 802          * variable size of the options field
 803          */
 804         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 805         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 806         bcast_ip.s_addr = 0xFFFFFFFFL;
 807         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 808         net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 809
 810 #if defined(CONFIG_CMD_DHCP)
 811         dhcp_state = SELECTING;
 812         net_set_udp_handler(dhcp_handler);
 813 #else
 814         net_set_udp_handler(bootp_handler);
 815 #endif
 816         net_send_packet(net_tx_packet, pktlen);
 817 }
 818
 819 #if defined(CONFIG_CMD_DHCP)
 820 static void dhcp_process_options(uchar *popt, uchar *end)
 821 {
 822         int oplen, size;
 823 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 824         int *to_ptr;
 825 #endif
 826
 827         while (popt < end && *popt != 0xff) {
 828                 oplen = *(popt + 1);
 829                 switch (*popt) {
 830                 case 0:
 831                         oplen = -1; /* Pad omits len byte */
 832                         break;
 833                 case 1:
 834                         net_copy_ip(&net_netmask, (popt + 2));
 835                         break;
 836 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 837                 case 2:         /* Time offset  */
 838                         to_ptr = &net_ntp_time_offset;
 839                         net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
 840                         net_ntp_time_offset = ntohl(net_ntp_time_offset);
 841                         break;
 842 #endif
 843                 case 3:
 844                         net_copy_ip(&net_gateway, (popt + 2));
 845                         break;
 846                 case 6:
 847                         net_copy_ip(&net_dns_server, (popt + 2));
 848 #if defined(CONFIG_BOOTP_DNS2)
 849                         if (*(popt + 1) > 4)
 850                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
 851 #endif
 852                         break;
 853                 case 12:
 854                         size = truncate_sz("Host Name",
 855                                 sizeof(net_hostname), oplen);
 856                         memcpy(&net_hostname, popt + 2, size);
 857                         net_hostname[size] = 0;
 858                         break;
 859                 case 15:        /* Ignore Domain Name Option */
 860                         break;
 861                 case 17:
 862                         size = truncate_sz("Root Path",
 863                                 sizeof(net_root_path), oplen);
 864                         memcpy(&net_root_path, popt + 2, size);
 865                         net_root_path[size] = 0;
 866                         break;
 867                 case 28:        /* Ignore Broadcast Address Option */
 868                         break;
 869 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 870                 case 42:        /* NTP server IP */
 871                         net_copy_ip(&net_ntp_server, (popt + 2));
 872                         break;
 873 #endif
 874                 case 51:
 875                         net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
 876                         break;
 877                 case 52:
 878                         dhcp_option_overload = popt[2];
 879                         break;
 880                 case 53:        /* Ignore Message Type Option */
 881                         break;
 882                 case 54:
 883                         net_copy_ip(&dhcp_server_ip, (popt + 2));
 884                         break;
 885                 case 58:        /* Ignore Renewal Time Option */
 886                         break;
 887                 case 59:        /* Ignore Rebinding Time Option */
 888                         break;
 889                 case 66:        /* Ignore TFTP server name */
 890                         break;
 891                 case 67:        /* Bootfile option */
 892                         size = truncate_sz("Bootfile",
 893                                            sizeof(net_boot_file_name), oplen);
 894                         memcpy(&net_boot_file_name, popt + 2, size);
 895                         net_boot_file_name[size] = 0;
 896                         break;
 897                 default:
 898 #if defined(CONFIG_BOOTP_VENDOREX)
 899                         if (dhcp_vendorex_proc(popt))
 900                                 break;
 901 #endif
 902                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
 903                                " %d\n", *popt);
 904                         break;
 905                 }
 906                 popt += oplen + 2;      /* Process next option */
 907         }
 908 }
 909
 910 static void dhcp_packet_process_options(struct bootp_hdr *bp)
 911 {
 912         uchar *popt = (uchar *)&bp->bp_vend[4];
 913         uchar *end = popt + BOOTP_HDR_SIZE;
 914
 915         if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
 916                 return;
 917
 918         dhcp_option_overload = 0;
 919
 920         /*
 921          * The 'options' field MUST be interpreted first, 'file' next,
 922          * 'sname' last.
 923          */
 924         dhcp_process_options(popt, end);
 925
 926         if (dhcp_option_overload & OVERLOAD_FILE) {
 927                 popt = (uchar *)bp->bp_file;
 928                 end = popt + sizeof(bp->bp_file);
 929                 dhcp_process_options(popt, end);
 930         }
 931
 932         if (dhcp_option_overload & OVERLOAD_SNAME) {
 933                 popt = (uchar *)bp->bp_sname;
 934                 end = popt + sizeof(bp->bp_sname);
 935                 dhcp_process_options(popt, end);
 936         }
 937 }
 938
 939 static int dhcp_message_type(unsigned char *popt)
 940 {
 941         if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
 942                 return -1;
 943
 944         popt += 4;
 945         while (*popt != 0xff) {
 946                 if (*popt == 53)        /* DHCP Message Type */
 947                         return *(popt + 2);
 948                 if (*popt == 0) {
 949                         /* Pad */
 950                         popt += 1;
 951                 } else {
 952                         /* Scan through all options */
 953                         popt += *(popt + 1) + 2;
 954                 }
 955         }
 956         return -1;
 957 }
 958
 959 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
 960 {
 961         uchar *pkt, *iphdr;
 962         struct bootp_hdr *bp;
 963         int pktlen, iplen, extlen;
 964         int eth_hdr_size;
 965         struct in_addr offered_ip;
 966         struct in_addr zero_ip;
 967         struct in_addr bcast_ip;
 968
 969         debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
 970         pkt = net_tx_packet;
 971         memset((void *)pkt, 0, PKTSIZE);
 972
 973         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 974         pkt += eth_hdr_size;
 975
 976         iphdr = pkt;    /* We'll need this later to set proper pkt size */
 977         pkt += IP_UDP_HDR_SIZE;
 978
 979         bp = (struct bootp_hdr *)pkt;
 980         bp->bp_op = OP_BOOTREQUEST;
 981         bp->bp_htype = HWT_ETHER;
 982         bp->bp_hlen = HWL_ETHER;
 983         bp->bp_hops = 0;
 984         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 985         /* Do not set the client IP, your IP, or server IP yet, since it
 986          * hasn't been ACK'ed by the server yet */
 987
 988         /*
 989          * RFC3046 requires Relay Agents to discard packets with
 990          * nonzero and offered giaddr
 991          */
 992         zero_ip.s_addr = 0;
 993         net_write_ip(&bp->bp_giaddr, zero_ip);
 994
 995         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 996         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 997
 998         /*
 999          * ID is the id of the OFFER packet
1000          */
1001
1002         net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1003
1004         /*
1005          * Copy options from OFFER packet if present
1006          */
1007
1008         /* Copy offered IP into the parameters request list */
1009         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1010         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1011                 dhcp_server_ip, offered_ip);
1012
1013         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1014         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1015         bcast_ip.s_addr = 0xFFFFFFFFL;
1016         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1017
1018 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1019         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1020 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1021         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1022         net_send_packet(net_tx_packet, pktlen);
1023 }
1024
1025 /*
1026  *      Handle DHCP received packets.
1027  */
1028 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1029                          unsigned src, unsigned len)
1030 {
1031         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1032
1033         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1034               src, dest, len, dhcp_state);
1035
1036         /* Filter out pkts we don't want */
1037         if (check_reply_packet(pkt, dest, src, len))
1038                 return;
1039
1040         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1041               "%d\n", src, dest, len, dhcp_state);
1042
1043         if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1044                 return;
1045
1046         switch (dhcp_state) {
1047         case SELECTING:
1048                 /*
1049                  * Wait an appropriate time for any potential DHCPOFFER packets
1050                  * to arrive.  Then select one, and generate DHCPREQUEST
1051                  * response.  If filename is in format we recognize, assume it
1052                  * is a valid OFFER from a server we want.
1053                  */
1054                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1055 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1056                 if (strncmp(bp->bp_file,
1057                             CONFIG_SYS_BOOTFILE_PREFIX,
1058                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1059 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1060                         dhcp_packet_process_options(bp);
1061                         efi_net_set_dhcp_ack(pkt, len);
1062
1063                         debug("TRANSITIONING TO REQUESTING STATE\n");
1064                         dhcp_state = REQUESTING;
1065
1066                         net_set_timeout_handler(5000, bootp_timeout_handler);
1067                         dhcp_send_request_packet(bp);
1068 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1069                 }
1070 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1071
1072                 return;
1073                 break;
1074         case REQUESTING:
1075                 debug("DHCP State: REQUESTING\n");
1076
1077                 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1078                         dhcp_packet_process_options(bp);
1079                         /* Store net params from reply */
1080                         store_net_params(bp);
1081                         dhcp_state = BOUND;
1082                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1083                                &net_ip, get_timer(bootp_start));
1084                         net_set_timeout_handler(0, (thand_f *)0);
1085                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1086                                             "bootp_stop");
1087
1088                         net_auto_load();
1089                         return;
1090                 }
1091                 break;
1092         case BOUND:
1093                 /* DHCP client bound to address */
1094                 break;
1095         default:
1096                 puts("DHCP: INVALID STATE\n");
1097                 break;
1098         }
1099 }
1100
1101 void dhcp_request(void)
1102 {
1103         bootp_request();
1104 }
1105 #endif  /* CONFIG_CMD_DHCP */