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 #include "nfs.h"
  18 #ifdef CONFIG_STATUS_LED
  19 #include <status_led.h>
  20 #endif
  21 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  22 #include "net_rand.h"
  23 #endif
  24
  25 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie */
  26
  27 /*
  28  * The timeout for the initial BOOTP/DHCP request used to be described by a
  29  * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
  30  * that counter
  31  *
  32  * Now that the timeout periods are variable (exponential backoff and retry)
  33  * we convert the timeout count to the absolute time it would have take to
  34  * execute that many retries, and keep sending retry packets until that time
  35  * is reached.
  36  */
  37 #ifndef CONFIG_NET_RETRY_COUNT
  38 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up */
  39 #else
  40 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  41 #endif
  42 #define TIMEOUT_MS      ((3 + (TIMEOUT_COUNT * 5)) * 1000)
  43
  44 #define PORT_BOOTPS     67              /* BOOTP server UDP port */
  45 #define PORT_BOOTPC     68              /* BOOTP client UDP port */
  46
  47 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list */
  48 #define CONFIG_DHCP_MIN_EXT_LEN 64
  49 #endif
  50
  51 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
  52 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
  53 #endif
  54
  55 u32             bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
  56 unsigned int    bootp_num_ids;
  57 int             bootp_try;
  58 ulong           bootp_start;
  59 ulong           bootp_timeout;
  60 char net_nis_domain[32] = {0,}; /* Our NIS domain */
  61 char net_hostname[32] = {0,}; /* Our hostname */
  62 char net_root_path[64] = {0,}; /* Our bootpath */
  63
  64 static ulong time_taken_max;
  65
  66 #if defined(CONFIG_CMD_DHCP)
  67 static dhcp_state_t dhcp_state = INIT;
  68 static u32 dhcp_leasetime;
  69 static struct in_addr dhcp_server_ip;
  70 static u8 dhcp_option_overload;
  71 #define OVERLOAD_FILE 1
  72 #define OVERLOAD_SNAME 2
  73 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
  74                         unsigned src, unsigned len);
  75
  76 /* For Debug */
  77 #if 0
  78 static char *dhcpmsg2str(int type)
  79 {
  80         switch (type) {
  81         case 1:  return "DHCPDISCOVER"; break;
  82         case 2:  return "DHCPOFFER";    break;
  83         case 3:  return "DHCPREQUEST";  break;
  84         case 4:  return "DHCPDECLINE";  break;
  85         case 5:  return "DHCPACK";      break;
  86         case 6:  return "DHCPNACK";     break;
  87         case 7:  return "DHCPRELEASE";  break;
  88         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  89         }
  90 }
  91 #endif
  92 #endif
  93
  94 static void bootp_add_id(ulong id)
  95 {
  96         if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
  97                 size_t size = sizeof(bootp_ids) - sizeof(id);
  98
  99                 memmove(bootp_ids, &bootp_ids[1], size);
 100                 bootp_ids[bootp_num_ids - 1] = id;
 101         } else {
 102                 bootp_ids[bootp_num_ids] = id;
 103                 bootp_num_ids++;
 104         }
 105 }
 106
 107 static bool bootp_match_id(ulong id)
 108 {
 109         unsigned int i;
 110
 111         for (i = 0; i < bootp_num_ids; i++)
 112                 if (bootp_ids[i] == id)
 113                         return true;
 114
 115         return false;
 116 }
 117
 118 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
 119                               unsigned len)
 120 {
 121         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
 122         int retval = 0;
 123
 124         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
 125                 retval = -1;
 126         else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
 127                 retval = -2;
 128         else if (bp->bp_op != OP_BOOTREPLY)
 129                 retval = -3;
 130         else if (bp->bp_htype != HWT_ETHER)
 131                 retval = -4;
 132         else if (bp->bp_hlen != HWL_ETHER)
 133                 retval = -5;
 134         else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
 135                 retval = -6;
 136         else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
 137                 retval = -7;
 138
 139         debug("Filtering pkt = %d\n", retval);
 140
 141         return retval;
 142 }
 143
 144 /*
 145  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 146  */
 147 static void store_net_params(struct bootp_hdr *bp)
 148 {
 149 #if !defined(CONFIG_BOOTP_SERVERIP)
 150         struct in_addr tmp_ip;
 151
 152         net_copy_ip(&tmp_ip, &bp->bp_siaddr);
 153         if (tmp_ip.s_addr != 0)
 154                 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
 155         memcpy(net_server_ethaddr,
 156                ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
 157         if (
 158 #if defined(CONFIG_CMD_DHCP)
 159             !(dhcp_option_overload & OVERLOAD_FILE) &&
 160 #endif
 161             (strlen(bp->bp_file) > 0)) {
 162                 copy_filename(net_boot_file_name, bp->bp_file,
 163                               sizeof(net_boot_file_name));
 164         }
 165
 166         debug("net_boot_file_name: %s\n", net_boot_file_name);
 167
 168         /* Propagate to environment:
 169          * don't delete exising entry when BOOTP / DHCP reply does
 170          * not contain a new value
 171          */
 172         if (*net_boot_file_name)
 173                 setenv("bootfile", net_boot_file_name);
 174 #endif
 175         net_copy_ip(&net_ip, &bp->bp_yiaddr);
 176 }
 177
 178 static int truncate_sz(const char *name, int maxlen, int curlen)
 179 {
 180         if (curlen >= maxlen) {
 181                 printf("*** WARNING: %s is too long (%d - max: %d)"
 182                         " - truncated\n", name, curlen, maxlen);
 183                 curlen = maxlen - 1;
 184         }
 185         return curlen;
 186 }
 187
 188 #if !defined(CONFIG_CMD_DHCP)
 189
 190 static void bootp_process_vendor_field(u8 *ext)
 191 {
 192         int size = *(ext + 1);
 193
 194         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 195               *(ext + 1));
 196
 197         net_boot_file_expected_size_in_blocks = 0;
 198
 199         switch (*ext) {
 200                 /* Fixed length fields */
 201         case 1:                 /* Subnet mask */
 202                 if (net_netmask.s_addr == 0)
 203                         net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
 204                 break;
 205         case 2:                 /* Time offset - Not yet supported */
 206                 break;
 207                 /* Variable length fields */
 208         case 3:                 /* Gateways list */
 209                 if (net_gateway.s_addr == 0)
 210                         net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
 211                 break;
 212         case 4:                 /* Time server - Not yet supported */
 213                 break;
 214         case 5:                 /* IEN-116 name server - Not yet supported */
 215                 break;
 216         case 6:
 217                 if (net_dns_server.s_addr == 0)
 218                         net_copy_ip(&net_dns_server,
 219                                     (struct in_addr *)(ext + 2));
 220 #if defined(CONFIG_BOOTP_DNS2)
 221                 if ((net_dns_server2.s_addr == 0) && (size > 4))
 222                         net_copy_ip(&net_dns_server2,
 223                                     (struct in_addr *)(ext + 2 + 4));
 224 #endif
 225                 break;
 226         case 7:                 /* Log server - Not yet supported */
 227                 break;
 228         case 8:                 /* Cookie/Quote server - Not yet supported */
 229                 break;
 230         case 9:                 /* LPR server - Not yet supported */
 231                 break;
 232         case 10:                /* Impress server - Not yet supported */
 233                 break;
 234         case 11:                /* RPL server - Not yet supported */
 235                 break;
 236         case 12:                /* Host name */
 237                 if (net_hostname[0] == 0) {
 238                         size = truncate_sz("Host Name",
 239                                 sizeof(net_hostname), size);
 240                         memcpy(&net_hostname, ext + 2, size);
 241                         net_hostname[size] = 0;
 242                 }
 243                 break;
 244         case 13:                /* Boot file size */
 245                 if (size == 2)
 246                         net_boot_file_expected_size_in_blocks =
 247                                 ntohs(*(ushort *)(ext + 2));
 248                 else if (size == 4)
 249                         net_boot_file_expected_size_in_blocks =
 250                                 ntohl(*(ulong *)(ext + 2));
 251                 break;
 252         case 14:                /* Merit dump file - Not yet supported */
 253                 break;
 254         case 15:                /* Domain name - Not yet supported */
 255                 break;
 256         case 16:                /* Swap server - Not yet supported */
 257                 break;
 258         case 17:                /* Root path */
 259                 if (net_root_path[0] == 0) {
 260                         size = truncate_sz("Root Path",
 261                                 sizeof(net_root_path), size);
 262                         memcpy(&net_root_path, ext + 2, size);
 263                         net_root_path[size] = 0;
 264                 }
 265                 break;
 266         case 18:                /* Extension path - Not yet supported */
 267                 /*
 268                  * This can be used to send the information of the
 269                  * vendor area in another file that the client can
 270                  * access via TFTP.
 271                  */
 272                 break;
 273                 /* IP host layer fields */
 274         case 40:                /* NIS Domain name */
 275                 if (net_nis_domain[0] == 0) {
 276                         size = truncate_sz("NIS Domain Name",
 277                                 sizeof(net_nis_domain), size);
 278                         memcpy(&net_nis_domain, ext + 2, size);
 279                         net_nis_domain[size] = 0;
 280                 }
 281                 break;
 282 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 283         case 42:        /* NTP server IP */
 284                 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
 285                 break;
 286 #endif
 287                 /* Application layer fields */
 288         case 43:                /* Vendor specific info - Not yet supported */
 289                 /*
 290                  * Binary information to exchange specific
 291                  * product information.
 292                  */
 293                 break;
 294                 /* Reserved (custom) fields (128..254) */
 295         }
 296 }
 297
 298 static void bootp_process_vendor(u8 *ext, int size)
 299 {
 300         u8 *end = ext + size;
 301
 302         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 303
 304         while ((ext < end) && (*ext != 0xff)) {
 305                 if (*ext == 0) {
 306                         ext++;
 307                 } else {
 308                         u8 *opt = ext;
 309
 310                         ext += ext[1] + 2;
 311                         if (ext <= end)
 312                                 bootp_process_vendor_field(opt);
 313                 }
 314         }
 315
 316         debug("[BOOTP] Received fields:\n");
 317         if (net_netmask.s_addr)
 318                 debug("net_netmask : %pI4\n", &net_netmask);
 319
 320         if (net_gateway.s_addr)
 321                 debug("net_gateway      : %pI4", &net_gateway);
 322
 323         if (net_boot_file_expected_size_in_blocks)
 324                 debug("net_boot_file_expected_size_in_blocks : %d\n",
 325                       net_boot_file_expected_size_in_blocks);
 326
 327         if (net_hostname[0])
 328                 debug("net_hostname  : %s\n", net_hostname);
 329
 330         if (net_root_path[0])
 331                 debug("net_root_path  : %s\n", net_root_path);
 332
 333         if (net_nis_domain[0])
 334                 debug("net_nis_domain : %s\n", net_nis_domain);
 335
 336 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 337         if (net_ntp_server)
 338                 debug("net_ntp_server : %pI4\n", &net_ntp_server);
 339 #endif
 340 }
 341
 342 /*
 343  *      Handle a BOOTP received packet.
 344  */
 345 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 346                           unsigned src, unsigned len)
 347 {
 348         struct bootp_hdr *bp;
 349
 350         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 351               src, dest, len, sizeof(struct bootp_hdr));
 352
 353         bp = (struct bootp_hdr *)pkt;
 354
 355         /* Filter out pkts we don't want */
 356         if (check_reply_packet(pkt, dest, src, len))
 357                 return;
 358
 359         /*
 360          *      Got a good BOOTP reply.  Copy the data into our variables.
 361          */
 362 #if defined(CONFIG_STATUS_LED) && defined(STATUS_LED_BOOT)
 363         status_led_set(STATUS_LED_BOOT, STATUS_LED_OFF);
 364 #endif
 365
 366         store_net_params(bp);           /* Store net parameters from reply */
 367
 368         /* Retrieve extended information (we must parse the vendor area) */
 369         if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 370                 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
 371
 372         net_set_timeout_handler(0, (thand_f *)0);
 373         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
 374
 375         debug("Got good BOOTP\n");
 376
 377         net_auto_load();
 378 }
 379 #endif
 380
 381 /*
 382  *      Timeout on BOOTP/DHCP request.
 383  */
 384 static void bootp_timeout_handler(void)
 385 {
 386         ulong time_taken = get_timer(bootp_start);
 387
 388         if (time_taken >= time_taken_max) {
 389 #ifdef CONFIG_BOOTP_MAY_FAIL
 390                 puts("\nRetry time exceeded\n");
 391                 net_set_state(NETLOOP_FAIL);
 392 #else
 393                 puts("\nRetry time exceeded; starting again\n");
 394                 net_start_again();
 395 #endif
 396         } else {
 397                 bootp_timeout *= 2;
 398                 if (bootp_timeout > 2000)
 399                         bootp_timeout = 2000;
 400                 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 401                 bootp_request();
 402         }
 403 }
 404
 405 #define put_vci(e, str)                                         \
 406         do {                                                    \
 407                 size_t vci_strlen = strlen(str);                \
 408                 *e++ = 60;      /* Vendor Class Identifier */   \
 409                 *e++ = vci_strlen;                              \
 410                 memcpy(e, str, vci_strlen);                     \
 411                 e += vci_strlen;                                \
 412         } while (0)
 413
 414 /*
 415  *      Initialize BOOTP extension fields in the request.
 416  */
 417 #if defined(CONFIG_CMD_DHCP)
 418 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
 419                         struct in_addr requested_ip)
 420 {
 421         u8 *start = e;
 422         u8 *cnt;
 423 #if defined(CONFIG_BOOTP_PXE)
 424         char *uuid;
 425         u16 clientarch;
 426 #endif
 427
 428 #if defined(CONFIG_BOOTP_VENDOREX)
 429         u8 *x;
 430 #endif
 431 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 432         char *hostname;
 433 #endif
 434
 435         *e++ = 99;              /* RFC1048 Magic Cookie */
 436         *e++ = 130;
 437         *e++ = 83;
 438         *e++ = 99;
 439
 440         *e++ = 53;              /* DHCP Message Type */
 441         *e++ = 1;
 442         *e++ = message_type;
 443
 444         *e++ = 57;              /* Maximum DHCP Message Size */
 445         *e++ = 2;
 446         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
 447         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 448
 449         if (server_ip.s_addr) {
 450                 int tmp = ntohl(server_ip.s_addr);
 451
 452                 *e++ = 54;      /* ServerID */
 453                 *e++ = 4;
 454                 *e++ = tmp >> 24;
 455                 *e++ = tmp >> 16;
 456                 *e++ = tmp >> 8;
 457                 *e++ = tmp & 0xff;
 458         }
 459
 460         if (requested_ip.s_addr) {
 461                 int tmp = ntohl(requested_ip.s_addr);
 462
 463                 *e++ = 50;      /* Requested IP */
 464                 *e++ = 4;
 465                 *e++ = tmp >> 24;
 466                 *e++ = tmp >> 16;
 467                 *e++ = tmp >> 8;
 468                 *e++ = tmp & 0xff;
 469         }
 470 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 471         hostname = getenv("hostname");
 472         if (hostname) {
 473                 int hostnamelen = strlen(hostname);
 474
 475                 *e++ = 12;      /* Hostname */
 476                 *e++ = hostnamelen;
 477                 memcpy(e, hostname, hostnamelen);
 478                 e += hostnamelen;
 479         }
 480 #endif
 481
 482 #if defined(CONFIG_BOOTP_PXE)
 483         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 484         *e++ = 93;      /* Client System Architecture */
 485         *e++ = 2;
 486         *e++ = (clientarch >> 8) & 0xff;
 487         *e++ = clientarch & 0xff;
 488
 489         *e++ = 94;      /* Client Network Interface Identifier */
 490         *e++ = 3;
 491         *e++ = 1;       /* type field for UNDI */
 492         *e++ = 0;       /* major revision */
 493         *e++ = 0;       /* minor revision */
 494
 495         uuid = getenv("pxeuuid");
 496
 497         if (uuid) {
 498                 if (uuid_str_valid(uuid)) {
 499                         *e++ = 97;      /* Client Machine Identifier */
 500                         *e++ = 17;
 501                         *e++ = 0;       /* type 0 - UUID */
 502
 503                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
 504                         e += 16;
 505                 } else {
 506                         printf("Invalid pxeuuid: %s\n", uuid);
 507                 }
 508         }
 509 #endif
 510
 511 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
 512         put_vci(e, CONFIG_SPL_NET_VCI_STRING);
 513 #elif defined(CONFIG_BOOTP_VCI_STRING)
 514         put_vci(e, CONFIG_BOOTP_VCI_STRING);
 515 #endif
 516
 517 #if defined(CONFIG_BOOTP_VENDOREX)
 518         x = dhcp_vendorex_prep(e);
 519         if (x)
 520                 return x - start;
 521 #endif
 522
 523         *e++ = 55;              /* Parameter Request List */
 524          cnt = e++;             /* Pointer to count of requested items */
 525         *cnt = 0;
 526 #if defined(CONFIG_BOOTP_SUBNETMASK)
 527         *e++  = 1;              /* Subnet Mask */
 528         *cnt += 1;
 529 #endif
 530 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 531         *e++  = 2;
 532         *cnt += 1;
 533 #endif
 534 #if defined(CONFIG_BOOTP_GATEWAY)
 535         *e++  = 3;              /* Router Option */
 536         *cnt += 1;
 537 #endif
 538 #if defined(CONFIG_BOOTP_DNS)
 539         *e++  = 6;              /* DNS Server(s) */
 540         *cnt += 1;
 541 #endif
 542 #if defined(CONFIG_BOOTP_HOSTNAME)
 543         *e++  = 12;             /* Hostname */
 544         *cnt += 1;
 545 #endif
 546 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 547         *e++  = 13;             /* Boot File Size */
 548         *cnt += 1;
 549 #endif
 550 #if defined(CONFIG_BOOTP_BOOTPATH)
 551         *e++  = 17;             /* Boot path */
 552         *cnt += 1;
 553 #endif
 554 #if defined(CONFIG_BOOTP_NISDOMAIN)
 555         *e++  = 40;             /* NIS Domain name request */
 556         *cnt += 1;
 557 #endif
 558 #if defined(CONFIG_BOOTP_NTPSERVER)
 559         *e++  = 42;
 560         *cnt += 1;
 561 #endif
 562         /* no options, so back up to avoid sending an empty request list */
 563         if (*cnt == 0)
 564                 e -= 2;
 565
 566         *e++  = 255;            /* End of the list */
 567
 568         /* Pad to minimal length */
 569 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 570         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 571                 *e++ = 0;
 572 #endif
 573
 574         return e - start;
 575 }
 576
 577 #else
 578 /*
 579  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 580  */
 581 static int bootp_extended(u8 *e)
 582 {
 583         u8 *start = e;
 584
 585         *e++ = 99;              /* RFC1048 Magic Cookie */
 586         *e++ = 130;
 587         *e++ = 83;
 588         *e++ = 99;
 589
 590 #if defined(CONFIG_CMD_DHCP)
 591         *e++ = 53;              /* DHCP Message Type */
 592         *e++ = 1;
 593         *e++ = DHCP_DISCOVER;
 594
 595         *e++ = 57;              /* Maximum DHCP Message Size */
 596         *e++ = 2;
 597         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
 598         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 599 #endif
 600
 601 #if defined(CONFIG_BOOTP_VCI_STRING) || \
 602         (defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING))
 603 #ifdef CONFIG_SPL_BUILD
 604         put_vci(e, CONFIG_SPL_NET_VCI_STRING);
 605 #else
 606         put_vci(e, CONFIG_BOOTP_VCI_STRING);
 607 #endif
 608 #endif
 609
 610 #if defined(CONFIG_BOOTP_SUBNETMASK)
 611         *e++ = 1;               /* Subnet mask request */
 612         *e++ = 4;
 613         e   += 4;
 614 #endif
 615
 616 #if defined(CONFIG_BOOTP_GATEWAY)
 617         *e++ = 3;               /* Default gateway request */
 618         *e++ = 4;
 619         e   += 4;
 620 #endif
 621
 622 #if defined(CONFIG_BOOTP_DNS)
 623         *e++ = 6;               /* Domain Name Server */
 624         *e++ = 4;
 625         e   += 4;
 626 #endif
 627
 628 #if defined(CONFIG_BOOTP_HOSTNAME)
 629         *e++ = 12;              /* Host name request */
 630         *e++ = 32;
 631         e   += 32;
 632 #endif
 633
 634 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 635         *e++ = 13;              /* Boot file size */
 636         *e++ = 2;
 637         e   += 2;
 638 #endif
 639
 640 #if defined(CONFIG_BOOTP_BOOTPATH)
 641         *e++ = 17;              /* Boot path */
 642         *e++ = 32;
 643         e   += 32;
 644 #endif
 645
 646 #if defined(CONFIG_BOOTP_NISDOMAIN)
 647         *e++ = 40;              /* NIS Domain name request */
 648         *e++ = 32;
 649         e   += 32;
 650 #endif
 651 #if defined(CONFIG_BOOTP_NTPSERVER)
 652         *e++ = 42;
 653         *e++ = 4;
 654         e   += 4;
 655 #endif
 656
 657         *e++ = 255;             /* End of the list */
 658
 659         return e - start;
 660 }
 661 #endif
 662
 663 void bootp_reset(void)
 664 {
 665         bootp_num_ids = 0;
 666         bootp_try = 0;
 667         bootp_start = get_timer(0);
 668         bootp_timeout = 250;
 669 }
 670
 671 void bootp_request(void)
 672 {
 673         uchar *pkt, *iphdr;
 674         struct bootp_hdr *bp;
 675         int extlen, pktlen, iplen;
 676         int eth_hdr_size;
 677 #ifdef CONFIG_BOOTP_RANDOM_DELAY
 678         ulong rand_ms;
 679 #endif
 680         u32 bootp_id;
 681         struct in_addr zero_ip;
 682         struct in_addr bcast_ip;
 683         char *ep;  /* Environment pointer */
 684
 685         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 686 #if defined(CONFIG_CMD_DHCP)
 687         dhcp_state = INIT;
 688 #endif
 689
 690         ep = getenv("bootpretryperiod");
 691         if (ep != NULL)
 692                 time_taken_max = simple_strtoul(ep, NULL, 10);
 693         else
 694                 time_taken_max = TIMEOUT_MS;
 695
 696 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 697         if (bootp_try == 0)
 698                 srand_mac();
 699
 700         if (bootp_try <= 2)     /* Start with max 1024 * 1ms */
 701                 rand_ms = rand() >> (22 - bootp_try);
 702         else            /* After 3rd BOOTP request max 8192 * 1ms */
 703                 rand_ms = rand() >> 19;
 704
 705         printf("Random delay: %ld ms...\n", rand_ms);
 706         mdelay(rand_ms);
 707
 708 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 709
 710         printf("BOOTP broadcast %d\n", ++bootp_try);
 711         pkt = net_tx_packet;
 712         memset((void *)pkt, 0, PKTSIZE);
 713
 714         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 715         pkt += eth_hdr_size;
 716
 717         /*
 718          * Next line results in incorrect packet size being transmitted,
 719          * resulting in errors in some DHCP servers, reporting missing bytes.
 720          * Size must be set in packet header after extension length has been
 721          * determined.
 722          * C. Hallinan, DS4.COM, Inc.
 723          */
 724         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
 725                 sizeof (struct bootp_hdr)); */
 726         iphdr = pkt;    /* We need this later for net_set_udp_header() */
 727         pkt += IP_UDP_HDR_SIZE;
 728
 729         bp = (struct bootp_hdr *)pkt;
 730         bp->bp_op = OP_BOOTREQUEST;
 731         bp->bp_htype = HWT_ETHER;
 732         bp->bp_hlen = HWL_ETHER;
 733         bp->bp_hops = 0;
 734         /*
 735          * according to RFC1542, should be 0 on first request, secs since
 736          * first request otherwise
 737          */
 738         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 739         zero_ip.s_addr = 0;
 740         net_write_ip(&bp->bp_ciaddr, zero_ip);
 741         net_write_ip(&bp->bp_yiaddr, zero_ip);
 742         net_write_ip(&bp->bp_siaddr, zero_ip);
 743         net_write_ip(&bp->bp_giaddr, zero_ip);
 744         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 745         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 746
 747         /* Request additional information from the BOOTP/DHCP server */
 748 #if defined(CONFIG_CMD_DHCP)
 749         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
 750                                zero_ip);
 751 #else
 752         extlen = bootp_extended((u8 *)bp->bp_vend);
 753 #endif
 754
 755         /*
 756          *      Bootp ID is the lower 4 bytes of our ethernet address
 757          *      plus the current time in ms.
 758          */
 759         bootp_id = ((u32)net_ethaddr[2] << 24)
 760                 | ((u32)net_ethaddr[3] << 16)
 761                 | ((u32)net_ethaddr[4] << 8)
 762                 | (u32)net_ethaddr[5];
 763         bootp_id += get_timer(0);
 764         bootp_id = htonl(bootp_id);
 765         bootp_add_id(bootp_id);
 766         net_copy_u32(&bp->bp_id, &bootp_id);
 767
 768         /*
 769          * Calculate proper packet lengths taking into account the
 770          * variable size of the options field
 771          */
 772         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 773         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 774         bcast_ip.s_addr = 0xFFFFFFFFL;
 775         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 776         net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 777
 778 #if defined(CONFIG_CMD_DHCP)
 779         dhcp_state = SELECTING;
 780         net_set_udp_handler(dhcp_handler);
 781 #else
 782         net_set_udp_handler(bootp_handler);
 783 #endif
 784         net_send_packet(net_tx_packet, pktlen);
 785 }
 786
 787 #if defined(CONFIG_CMD_DHCP)
 788 static void dhcp_process_options(uchar *popt, uchar *end)
 789 {
 790         int oplen, size;
 791 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 792         int *to_ptr;
 793 #endif
 794
 795         while (popt < end && *popt != 0xff) {
 796                 oplen = *(popt + 1);
 797                 switch (*popt) {
 798                 case 0:
 799                         oplen = -1; /* Pad omits len byte */
 800                         break;
 801                 case 1:
 802                         net_copy_ip(&net_netmask, (popt + 2));
 803                         break;
 804 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 805                 case 2:         /* Time offset  */
 806                         to_ptr = &net_ntp_time_offset;
 807                         net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
 808                         net_ntp_time_offset = ntohl(net_ntp_time_offset);
 809                         break;
 810 #endif
 811                 case 3:
 812                         net_copy_ip(&net_gateway, (popt + 2));
 813                         break;
 814                 case 6:
 815                         net_copy_ip(&net_dns_server, (popt + 2));
 816 #if defined(CONFIG_BOOTP_DNS2)
 817                         if (*(popt + 1) > 4)
 818                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
 819 #endif
 820                         break;
 821                 case 12:
 822                         size = truncate_sz("Host Name",
 823                                 sizeof(net_hostname), oplen);
 824                         memcpy(&net_hostname, popt + 2, size);
 825                         net_hostname[size] = 0;
 826                         break;
 827                 case 15:        /* Ignore Domain Name Option */
 828                         break;
 829                 case 17:
 830                         size = truncate_sz("Root Path",
 831                                 sizeof(net_root_path), oplen);
 832                         memcpy(&net_root_path, popt + 2, size);
 833                         net_root_path[size] = 0;
 834                         break;
 835                 case 28:        /* Ignore Broadcast Address Option */
 836                         break;
 837 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 838                 case 42:        /* NTP server IP */
 839                         net_copy_ip(&net_ntp_server, (popt + 2));
 840                         break;
 841 #endif
 842                 case 51:
 843                         net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
 844                         break;
 845                 case 52:
 846                         dhcp_option_overload = popt[2];
 847                         break;
 848                 case 53:        /* Ignore Message Type Option */
 849                         break;
 850                 case 54:
 851                         net_copy_ip(&dhcp_server_ip, (popt + 2));
 852                         break;
 853                 case 58:        /* Ignore Renewal Time Option */
 854                         break;
 855                 case 59:        /* Ignore Rebinding Time Option */
 856                         break;
 857                 case 66:        /* Ignore TFTP server name */
 858                         break;
 859                 case 67:        /* Bootfile option */
 860                         size = truncate_sz("Bootfile",
 861                                            sizeof(net_boot_file_name), oplen);
 862                         memcpy(&net_boot_file_name, popt + 2, size);
 863                         net_boot_file_name[size] = 0;
 864                         break;
 865                 default:
 866 #if defined(CONFIG_BOOTP_VENDOREX)
 867                         if (dhcp_vendorex_proc(popt))
 868                                 break;
 869 #endif
 870                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
 871                                " %d\n", *popt);
 872                         break;
 873                 }
 874                 popt += oplen + 2;      /* Process next option */
 875         }
 876 }
 877
 878 static void dhcp_packet_process_options(struct bootp_hdr *bp)
 879 {
 880         uchar *popt = (uchar *)&bp->bp_vend[4];
 881         uchar *end = popt + BOOTP_HDR_SIZE;
 882
 883         if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
 884                 return;
 885
 886         dhcp_option_overload = 0;
 887
 888         /*
 889          * The 'options' field MUST be interpreted first, 'file' next,
 890          * 'sname' last.
 891          */
 892         dhcp_process_options(popt, end);
 893
 894         if (dhcp_option_overload & OVERLOAD_FILE) {
 895                 popt = (uchar *)bp->bp_file;
 896                 end = popt + sizeof(bp->bp_file);
 897                 dhcp_process_options(popt, end);
 898         }
 899
 900         if (dhcp_option_overload & OVERLOAD_SNAME) {
 901                 popt = (uchar *)bp->bp_sname;
 902                 end = popt + sizeof(bp->bp_sname);
 903                 dhcp_process_options(popt, end);
 904         }
 905 }
 906
 907 static int dhcp_message_type(unsigned char *popt)
 908 {
 909         if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
 910                 return -1;
 911
 912         popt += 4;
 913         while (*popt != 0xff) {
 914                 if (*popt == 53)        /* DHCP Message Type */
 915                         return *(popt + 2);
 916                 if (*popt == 0) {
 917                         /* Pad */
 918                         popt += 1;
 919                 } else {
 920                         /* Scan through all options */
 921                         popt += *(popt + 1) + 2;
 922                 }
 923         }
 924         return -1;
 925 }
 926
 927 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
 928 {
 929         uchar *pkt, *iphdr;
 930         struct bootp_hdr *bp;
 931         int pktlen, iplen, extlen;
 932         int eth_hdr_size;
 933         struct in_addr offered_ip;
 934         struct in_addr zero_ip;
 935         struct in_addr bcast_ip;
 936
 937         debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
 938         pkt = net_tx_packet;
 939         memset((void *)pkt, 0, PKTSIZE);
 940
 941         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 942         pkt += eth_hdr_size;
 943
 944         iphdr = pkt;    /* We'll need this later to set proper pkt size */
 945         pkt += IP_UDP_HDR_SIZE;
 946
 947         bp = (struct bootp_hdr *)pkt;
 948         bp->bp_op = OP_BOOTREQUEST;
 949         bp->bp_htype = HWT_ETHER;
 950         bp->bp_hlen = HWL_ETHER;
 951         bp->bp_hops = 0;
 952         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 953         /* Do not set the client IP, your IP, or server IP yet, since it
 954          * hasn't been ACK'ed by the server yet */
 955
 956         /*
 957          * RFC3046 requires Relay Agents to discard packets with
 958          * nonzero and offered giaddr
 959          */
 960         zero_ip.s_addr = 0;
 961         net_write_ip(&bp->bp_giaddr, zero_ip);
 962
 963         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 964         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 965
 966         /*
 967          * ID is the id of the OFFER packet
 968          */
 969
 970         net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
 971
 972         /*
 973          * Copy options from OFFER packet if present
 974          */
 975
 976         /* Copy offered IP into the parameters request list */
 977         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
 978         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
 979                 dhcp_server_ip, offered_ip);
 980
 981         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 982         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 983         bcast_ip.s_addr = 0xFFFFFFFFL;
 984         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 985
 986 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
 987         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
 988 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
 989         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
 990         net_send_packet(net_tx_packet, pktlen);
 991 }
 992
 993 /*
 994  *      Handle DHCP received packets.
 995  */
 996 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 997                          unsigned src, unsigned len)
 998 {
 999         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1000
1001         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1002               src, dest, len, dhcp_state);
1003
1004         /* Filter out pkts we don't want */
1005         if (check_reply_packet(pkt, dest, src, len))
1006                 return;
1007
1008         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1009               "%d\n", src, dest, len, dhcp_state);
1010
1011         if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1012                 return;
1013
1014         switch (dhcp_state) {
1015         case SELECTING:
1016                 /*
1017                  * Wait an appropriate time for any potential DHCPOFFER packets
1018                  * to arrive.  Then select one, and generate DHCPREQUEST
1019                  * response.  If filename is in format we recognize, assume it
1020                  * is a valid OFFER from a server we want.
1021                  */
1022                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1023 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1024                 if (strncmp(bp->bp_file,
1025                             CONFIG_SYS_BOOTFILE_PREFIX,
1026                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1027 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1028                         dhcp_packet_process_options(bp);
1029                         efi_net_set_dhcp_ack(pkt, len);
1030
1031                         debug("TRANSITIONING TO REQUESTING STATE\n");
1032                         dhcp_state = REQUESTING;
1033
1034                         net_set_timeout_handler(5000, bootp_timeout_handler);
1035                         dhcp_send_request_packet(bp);
1036 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1037                 }
1038 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1039
1040                 return;
1041                 break;
1042         case REQUESTING:
1043                 debug("DHCP State: REQUESTING\n");
1044
1045                 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1046                         dhcp_packet_process_options(bp);
1047                         /* Store net params from reply */
1048                         store_net_params(bp);
1049                         dhcp_state = BOUND;
1050                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1051                                &net_ip, get_timer(bootp_start));
1052                         net_set_timeout_handler(0, (thand_f *)0);
1053                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1054                                             "bootp_stop");
1055
1056                         net_auto_load();
1057                         return;
1058                 }
1059                 break;
1060         case BOUND:
1061                 /* DHCP client bound to address */
1062                 break;
1063         default:
1064                 puts("DHCP: INVALID STATE\n");
1065                 break;
1066         }
1067 }
1068
1069 void dhcp_request(void)
1070 {
1071         bootp_request();
1072 }
1073 #endif  /* CONFIG_CMD_DHCP */