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             !net_boot_file_name_explicit) {
 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                 env_set("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.s_addr)
 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_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
 363         status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_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                 char *ethrotate;
 391
 392                 ethrotate = env_get("ethrotate");
 393                 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
 394                     net_restart_wrap) {
 395                         puts("\nRetry time exceeded\n");
 396                         net_set_state(NETLOOP_FAIL);
 397                 } else
 398 #endif
 399                 {
 400                         puts("\nRetry time exceeded; starting again\n");
 401                         net_start_again();
 402                 }
 403         } else {
 404                 bootp_timeout *= 2;
 405                 if (bootp_timeout > 2000)
 406                         bootp_timeout = 2000;
 407                 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 408                 bootp_request();
 409         }
 410 }
 411
 412 #define put_vci(e, str)                                         \
 413         do {                                                    \
 414                 size_t vci_strlen = strlen(str);                \
 415                 *e++ = 60;      /* Vendor Class Identifier */   \
 416                 *e++ = vci_strlen;                              \
 417                 memcpy(e, str, vci_strlen);                     \
 418                 e += vci_strlen;                                \
 419         } while (0)
 420
 421 static u8 *add_vci(u8 *e)
 422 {
 423         char *vci = NULL;
 424         char *env_vci = env_get("bootp_vci");
 425
 426 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
 427         vci = CONFIG_SPL_NET_VCI_STRING;
 428 #elif defined(CONFIG_BOOTP_VCI_STRING)
 429         vci = CONFIG_BOOTP_VCI_STRING;
 430 #endif
 431
 432         if (env_vci)
 433                 vci = env_vci;
 434
 435         if (vci)
 436                 put_vci(e, vci);
 437
 438         return e;
 439 }
 440
 441 /*
 442  *      Initialize BOOTP extension fields in the request.
 443  */
 444 #if defined(CONFIG_CMD_DHCP)
 445 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
 446                         struct in_addr requested_ip)
 447 {
 448         u8 *start = e;
 449         u8 *cnt;
 450 #ifdef CONFIG_LIB_UUID
 451         char *uuid;
 452 #endif
 453         int clientarch = -1;
 454
 455 #if defined(CONFIG_BOOTP_VENDOREX)
 456         u8 *x;
 457 #endif
 458 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 459         char *hostname;
 460 #endif
 461
 462         *e++ = 99;              /* RFC1048 Magic Cookie */
 463         *e++ = 130;
 464         *e++ = 83;
 465         *e++ = 99;
 466
 467         *e++ = 53;              /* DHCP Message Type */
 468         *e++ = 1;
 469         *e++ = message_type;
 470
 471         *e++ = 57;              /* Maximum DHCP Message Size */
 472         *e++ = 2;
 473         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
 474         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 475
 476         if (server_ip.s_addr) {
 477                 int tmp = ntohl(server_ip.s_addr);
 478
 479                 *e++ = 54;      /* ServerID */
 480                 *e++ = 4;
 481                 *e++ = tmp >> 24;
 482                 *e++ = tmp >> 16;
 483                 *e++ = tmp >> 8;
 484                 *e++ = tmp & 0xff;
 485         }
 486
 487         if (requested_ip.s_addr) {
 488                 int tmp = ntohl(requested_ip.s_addr);
 489
 490                 *e++ = 50;      /* Requested IP */
 491                 *e++ = 4;
 492                 *e++ = tmp >> 24;
 493                 *e++ = tmp >> 16;
 494                 *e++ = tmp >> 8;
 495                 *e++ = tmp & 0xff;
 496         }
 497 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 498         hostname = env_get("hostname");
 499         if (hostname) {
 500                 int hostnamelen = strlen(hostname);
 501
 502                 *e++ = 12;      /* Hostname */
 503                 *e++ = hostnamelen;
 504                 memcpy(e, hostname, hostnamelen);
 505                 e += hostnamelen;
 506         }
 507 #endif
 508
 509 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
 510         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 511 #endif
 512
 513         if (env_get("bootp_arch"))
 514                 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
 515
 516         if (clientarch > 0) {
 517                 *e++ = 93;      /* Client System Architecture */
 518                 *e++ = 2;
 519                 *e++ = (clientarch >> 8) & 0xff;
 520                 *e++ = clientarch & 0xff;
 521         }
 522
 523         *e++ = 94;      /* Client Network Interface Identifier */
 524         *e++ = 3;
 525         *e++ = 1;       /* type field for UNDI */
 526         *e++ = 0;       /* major revision */
 527         *e++ = 0;       /* minor revision */
 528
 529 #ifdef CONFIG_LIB_UUID
 530         uuid = env_get("pxeuuid");
 531
 532         if (uuid) {
 533                 if (uuid_str_valid(uuid)) {
 534                         *e++ = 97;      /* Client Machine Identifier */
 535                         *e++ = 17;
 536                         *e++ = 0;       /* type 0 - UUID */
 537
 538                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
 539                         e += 16;
 540                 } else {
 541                         printf("Invalid pxeuuid: %s\n", uuid);
 542                 }
 543         }
 544 #endif
 545
 546         e = add_vci(e);
 547
 548 #if defined(CONFIG_BOOTP_VENDOREX)
 549         x = dhcp_vendorex_prep(e);
 550         if (x)
 551                 return x - start;
 552 #endif
 553
 554         *e++ = 55;              /* Parameter Request List */
 555          cnt = e++;             /* Pointer to count of requested items */
 556         *cnt = 0;
 557 #if defined(CONFIG_BOOTP_SUBNETMASK)
 558         *e++  = 1;              /* Subnet Mask */
 559         *cnt += 1;
 560 #endif
 561 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 562         *e++  = 2;
 563         *cnt += 1;
 564 #endif
 565 #if defined(CONFIG_BOOTP_GATEWAY)
 566         *e++  = 3;              /* Router Option */
 567         *cnt += 1;
 568 #endif
 569 #if defined(CONFIG_BOOTP_DNS)
 570         *e++  = 6;              /* DNS Server(s) */
 571         *cnt += 1;
 572 #endif
 573 #if defined(CONFIG_BOOTP_HOSTNAME)
 574         *e++  = 12;             /* Hostname */
 575         *cnt += 1;
 576 #endif
 577 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 578         *e++  = 13;             /* Boot File Size */
 579         *cnt += 1;
 580 #endif
 581 #if defined(CONFIG_BOOTP_BOOTPATH)
 582         *e++  = 17;             /* Boot path */
 583         *cnt += 1;
 584 #endif
 585 #if defined(CONFIG_BOOTP_NISDOMAIN)
 586         *e++  = 40;             /* NIS Domain name request */
 587         *cnt += 1;
 588 #endif
 589 #if defined(CONFIG_BOOTP_NTPSERVER)
 590         *e++  = 42;
 591         *cnt += 1;
 592 #endif
 593         /* no options, so back up to avoid sending an empty request list */
 594         if (*cnt == 0)
 595                 e -= 2;
 596
 597         *e++  = 255;            /* End of the list */
 598
 599         /* Pad to minimal length */
 600 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 601         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 602                 *e++ = 0;
 603 #endif
 604
 605         return e - start;
 606 }
 607
 608 #else
 609 /*
 610  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 611  */
 612 static int bootp_extended(u8 *e)
 613 {
 614         u8 *start = e;
 615
 616         *e++ = 99;              /* RFC1048 Magic Cookie */
 617         *e++ = 130;
 618         *e++ = 83;
 619         *e++ = 99;
 620
 621 #if defined(CONFIG_CMD_DHCP)
 622         *e++ = 53;              /* DHCP Message Type */
 623         *e++ = 1;
 624         *e++ = DHCP_DISCOVER;
 625
 626         *e++ = 57;              /* Maximum DHCP Message Size */
 627         *e++ = 2;
 628         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
 629         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 630 #endif
 631
 632         add_vci(e);
 633
 634 #if defined(CONFIG_BOOTP_SUBNETMASK)
 635         *e++ = 1;               /* Subnet mask request */
 636         *e++ = 4;
 637         e   += 4;
 638 #endif
 639
 640 #if defined(CONFIG_BOOTP_GATEWAY)
 641         *e++ = 3;               /* Default gateway request */
 642         *e++ = 4;
 643         e   += 4;
 644 #endif
 645
 646 #if defined(CONFIG_BOOTP_DNS)
 647         *e++ = 6;               /* Domain Name Server */
 648         *e++ = 4;
 649         e   += 4;
 650 #endif
 651
 652 #if defined(CONFIG_BOOTP_HOSTNAME)
 653         *e++ = 12;              /* Host name request */
 654         *e++ = 32;
 655         e   += 32;
 656 #endif
 657
 658 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 659         *e++ = 13;              /* Boot file size */
 660         *e++ = 2;
 661         e   += 2;
 662 #endif
 663
 664 #if defined(CONFIG_BOOTP_BOOTPATH)
 665         *e++ = 17;              /* Boot path */
 666         *e++ = 32;
 667         e   += 32;
 668 #endif
 669
 670 #if defined(CONFIG_BOOTP_NISDOMAIN)
 671         *e++ = 40;              /* NIS Domain name request */
 672         *e++ = 32;
 673         e   += 32;
 674 #endif
 675 #if defined(CONFIG_BOOTP_NTPSERVER)
 676         *e++ = 42;
 677         *e++ = 4;
 678         e   += 4;
 679 #endif
 680
 681         *e++ = 255;             /* End of the list */
 682
 683         /*
 684          * If nothing in list, remove it altogether. Some DHCP servers get
 685          * upset by this minor faux pas and do not respond at all.
 686          */
 687         if (e == start + 3) {
 688                 printf("*** Warning: no DHCP options requested\n");
 689                 e -= 3;
 690         }
 691
 692         return e - start;
 693 }
 694 #endif
 695
 696 void bootp_reset(void)
 697 {
 698         bootp_num_ids = 0;
 699         bootp_try = 0;
 700         bootp_start = get_timer(0);
 701         bootp_timeout = 250;
 702 }
 703
 704 void bootp_request(void)
 705 {
 706         uchar *pkt, *iphdr;
 707         struct bootp_hdr *bp;
 708         int extlen, pktlen, iplen;
 709         int eth_hdr_size;
 710 #ifdef CONFIG_BOOTP_RANDOM_DELAY
 711         ulong rand_ms;
 712 #endif
 713         u32 bootp_id;
 714         struct in_addr zero_ip;
 715         struct in_addr bcast_ip;
 716         char *ep;  /* Environment pointer */
 717
 718         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 719 #if defined(CONFIG_CMD_DHCP)
 720         dhcp_state = INIT;
 721 #endif
 722
 723         ep = env_get("bootpretryperiod");
 724         if (ep != NULL)
 725                 time_taken_max = simple_strtoul(ep, NULL, 10);
 726         else
 727                 time_taken_max = TIMEOUT_MS;
 728
 729 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 730         if (bootp_try == 0)
 731                 srand_mac();
 732
 733         if (bootp_try <= 2)     /* Start with max 1024 * 1ms */
 734                 rand_ms = rand() >> (22 - bootp_try);
 735         else            /* After 3rd BOOTP request max 8192 * 1ms */
 736                 rand_ms = rand() >> 19;
 737
 738         printf("Random delay: %ld ms...\n", rand_ms);
 739         mdelay(rand_ms);
 740
 741 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 742
 743         printf("BOOTP broadcast %d\n", ++bootp_try);
 744         pkt = net_tx_packet;
 745         memset((void *)pkt, 0, PKTSIZE);
 746
 747         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 748         pkt += eth_hdr_size;
 749
 750         /*
 751          * Next line results in incorrect packet size being transmitted,
 752          * resulting in errors in some DHCP servers, reporting missing bytes.
 753          * Size must be set in packet header after extension length has been
 754          * determined.
 755          * C. Hallinan, DS4.COM, Inc.
 756          */
 757         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
 758                 sizeof (struct bootp_hdr)); */
 759         iphdr = pkt;    /* We need this later for net_set_udp_header() */
 760         pkt += IP_UDP_HDR_SIZE;
 761
 762         bp = (struct bootp_hdr *)pkt;
 763         bp->bp_op = OP_BOOTREQUEST;
 764         bp->bp_htype = HWT_ETHER;
 765         bp->bp_hlen = HWL_ETHER;
 766         bp->bp_hops = 0;
 767         /*
 768          * according to RFC1542, should be 0 on first request, secs since
 769          * first request otherwise
 770          */
 771         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 772         zero_ip.s_addr = 0;
 773         net_write_ip(&bp->bp_ciaddr, zero_ip);
 774         net_write_ip(&bp->bp_yiaddr, zero_ip);
 775         net_write_ip(&bp->bp_siaddr, zero_ip);
 776         net_write_ip(&bp->bp_giaddr, zero_ip);
 777         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 778         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 779
 780         /* Request additional information from the BOOTP/DHCP server */
 781 #if defined(CONFIG_CMD_DHCP)
 782         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
 783                                zero_ip);
 784 #else
 785         extlen = bootp_extended((u8 *)bp->bp_vend);
 786 #endif
 787
 788         /*
 789          *      Bootp ID is the lower 4 bytes of our ethernet address
 790          *      plus the current time in ms.
 791          */
 792         bootp_id = ((u32)net_ethaddr[2] << 24)
 793                 | ((u32)net_ethaddr[3] << 16)
 794                 | ((u32)net_ethaddr[4] << 8)
 795                 | (u32)net_ethaddr[5];
 796         bootp_id += get_timer(0);
 797         bootp_id = htonl(bootp_id);
 798         bootp_add_id(bootp_id);
 799         net_copy_u32(&bp->bp_id, &bootp_id);
 800
 801         /*
 802          * Calculate proper packet lengths taking into account the
 803          * variable size of the options field
 804          */
 805         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 806         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 807         bcast_ip.s_addr = 0xFFFFFFFFL;
 808         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 809         net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 810
 811 #if defined(CONFIG_CMD_DHCP)
 812         dhcp_state = SELECTING;
 813         net_set_udp_handler(dhcp_handler);
 814 #else
 815         net_set_udp_handler(bootp_handler);
 816 #endif
 817         net_send_packet(net_tx_packet, pktlen);
 818 }
 819
 820 #if defined(CONFIG_CMD_DHCP)
 821 static void dhcp_process_options(uchar *popt, uchar *end)
 822 {
 823         int oplen, size;
 824 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 825         int *to_ptr;
 826 #endif
 827
 828         while (popt < end && *popt != 0xff) {
 829                 oplen = *(popt + 1);
 830                 switch (*popt) {
 831                 case 0:
 832                         oplen = -1; /* Pad omits len byte */
 833                         break;
 834                 case 1:
 835                         net_copy_ip(&net_netmask, (popt + 2));
 836                         break;
 837 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 838                 case 2:         /* Time offset  */
 839                         to_ptr = &net_ntp_time_offset;
 840                         net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
 841                         net_ntp_time_offset = ntohl(net_ntp_time_offset);
 842                         break;
 843 #endif
 844                 case 3:
 845                         net_copy_ip(&net_gateway, (popt + 2));
 846                         break;
 847                 case 6:
 848                         net_copy_ip(&net_dns_server, (popt + 2));
 849 #if defined(CONFIG_BOOTP_DNS2)
 850                         if (*(popt + 1) > 4)
 851                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
 852 #endif
 853                         break;
 854                 case 12:
 855                         size = truncate_sz("Host Name",
 856                                 sizeof(net_hostname), oplen);
 857                         memcpy(&net_hostname, popt + 2, size);
 858                         net_hostname[size] = 0;
 859                         break;
 860                 case 15:        /* Ignore Domain Name Option */
 861                         break;
 862                 case 17:
 863                         size = truncate_sz("Root Path",
 864                                 sizeof(net_root_path), oplen);
 865                         memcpy(&net_root_path, popt + 2, size);
 866                         net_root_path[size] = 0;
 867                         break;
 868                 case 28:        /* Ignore Broadcast Address Option */
 869                         break;
 870 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 871                 case 42:        /* NTP server IP */
 872                         net_copy_ip(&net_ntp_server, (popt + 2));
 873                         break;
 874 #endif
 875                 case 51:
 876                         net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
 877                         break;
 878                 case 52:
 879                         dhcp_option_overload = popt[2];
 880                         break;
 881                 case 53:        /* Ignore Message Type Option */
 882                         break;
 883                 case 54:
 884                         net_copy_ip(&dhcp_server_ip, (popt + 2));
 885                         break;
 886                 case 58:        /* Ignore Renewal Time Option */
 887                         break;
 888                 case 59:        /* Ignore Rebinding Time Option */
 889                         break;
 890                 case 66:        /* Ignore TFTP server name */
 891                         break;
 892                 case 67:        /* Bootfile option */
 893                         if (!net_boot_file_name_explicit) {
 894                                 size = truncate_sz("Bootfile",
 895                                                    sizeof(net_boot_file_name),
 896                                                    oplen);
 897                                 memcpy(&net_boot_file_name, popt + 2, size);
 898                                 net_boot_file_name[size] = 0;
 899                         }
 900                         break;
 901                 default:
 902 #if defined(CONFIG_BOOTP_VENDOREX)
 903                         if (dhcp_vendorex_proc(popt))
 904                                 break;
 905 #endif
 906                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
 907                                " %d\n", *popt);
 908                         break;
 909                 }
 910                 popt += oplen + 2;      /* Process next option */
 911         }
 912 }
 913
 914 static void dhcp_packet_process_options(struct bootp_hdr *bp)
 915 {
 916         uchar *popt = (uchar *)&bp->bp_vend[4];
 917         uchar *end = popt + BOOTP_HDR_SIZE;
 918
 919         if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
 920                 return;
 921
 922         dhcp_option_overload = 0;
 923
 924         /*
 925          * The 'options' field MUST be interpreted first, 'file' next,
 926          * 'sname' last.
 927          */
 928         dhcp_process_options(popt, end);
 929
 930         if (dhcp_option_overload & OVERLOAD_FILE) {
 931                 popt = (uchar *)bp->bp_file;
 932                 end = popt + sizeof(bp->bp_file);
 933                 dhcp_process_options(popt, end);
 934         }
 935
 936         if (dhcp_option_overload & OVERLOAD_SNAME) {
 937                 popt = (uchar *)bp->bp_sname;
 938                 end = popt + sizeof(bp->bp_sname);
 939                 dhcp_process_options(popt, end);
 940         }
 941 }
 942
 943 static int dhcp_message_type(unsigned char *popt)
 944 {
 945         if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
 946                 return -1;
 947
 948         popt += 4;
 949         while (*popt != 0xff) {
 950                 if (*popt == 53)        /* DHCP Message Type */
 951                         return *(popt + 2);
 952                 if (*popt == 0) {
 953                         /* Pad */
 954                         popt += 1;
 955                 } else {
 956                         /* Scan through all options */
 957                         popt += *(popt + 1) + 2;
 958                 }
 959         }
 960         return -1;
 961 }
 962
 963 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
 964 {
 965         uchar *pkt, *iphdr;
 966         struct bootp_hdr *bp;
 967         int pktlen, iplen, extlen;
 968         int eth_hdr_size;
 969         struct in_addr offered_ip;
 970         struct in_addr zero_ip;
 971         struct in_addr bcast_ip;
 972
 973         debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
 974         pkt = net_tx_packet;
 975         memset((void *)pkt, 0, PKTSIZE);
 976
 977         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 978         pkt += eth_hdr_size;
 979
 980         iphdr = pkt;    /* We'll need this later to set proper pkt size */
 981         pkt += IP_UDP_HDR_SIZE;
 982
 983         bp = (struct bootp_hdr *)pkt;
 984         bp->bp_op = OP_BOOTREQUEST;
 985         bp->bp_htype = HWT_ETHER;
 986         bp->bp_hlen = HWL_ETHER;
 987         bp->bp_hops = 0;
 988         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 989         /* Do not set the client IP, your IP, or server IP yet, since it
 990          * hasn't been ACK'ed by the server yet */
 991
 992         /*
 993          * RFC3046 requires Relay Agents to discard packets with
 994          * nonzero and offered giaddr
 995          */
 996         zero_ip.s_addr = 0;
 997         net_write_ip(&bp->bp_giaddr, zero_ip);
 998
 999         memcpy(bp->bp_chaddr, net_ethaddr, 6);
1000         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
1001
1002         /*
1003          * ID is the id of the OFFER packet
1004          */
1005
1006         net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1007
1008         /*
1009          * Copy options from OFFER packet if present
1010          */
1011
1012         /* Copy offered IP into the parameters request list */
1013         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1014         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1015                 dhcp_server_ip, offered_ip);
1016
1017         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1018         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1019         bcast_ip.s_addr = 0xFFFFFFFFL;
1020         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1021
1022 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1023         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1024 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1025         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1026         net_send_packet(net_tx_packet, pktlen);
1027 }
1028
1029 /*
1030  *      Handle DHCP received packets.
1031  */
1032 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1033                          unsigned src, unsigned len)
1034 {
1035         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1036
1037         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1038               src, dest, len, dhcp_state);
1039
1040         /* Filter out pkts we don't want */
1041         if (check_reply_packet(pkt, dest, src, len))
1042                 return;
1043
1044         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1045               "%d\n", src, dest, len, dhcp_state);
1046
1047         if (net_read_ip(&bp->bp_yiaddr).s_addr == 0)
1048                 return;
1049
1050         switch (dhcp_state) {
1051         case SELECTING:
1052                 /*
1053                  * Wait an appropriate time for any potential DHCPOFFER packets
1054                  * to arrive.  Then select one, and generate DHCPREQUEST
1055                  * response.  If filename is in format we recognize, assume it
1056                  * is a valid OFFER from a server we want.
1057                  */
1058                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1059 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1060                 if (strncmp(bp->bp_file,
1061                             CONFIG_SYS_BOOTFILE_PREFIX,
1062                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1063 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1064                         dhcp_packet_process_options(bp);
1065                         efi_net_set_dhcp_ack(pkt, len);
1066
1067                         debug("TRANSITIONING TO REQUESTING STATE\n");
1068                         dhcp_state = REQUESTING;
1069
1070                         net_set_timeout_handler(5000, bootp_timeout_handler);
1071                         dhcp_send_request_packet(bp);
1072 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1073                 }
1074 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1075
1076                 return;
1077                 break;
1078         case REQUESTING:
1079                 debug("DHCP State: REQUESTING\n");
1080
1081                 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1082                         dhcp_packet_process_options(bp);
1083                         /* Store net params from reply */
1084                         store_net_params(bp);
1085                         dhcp_state = BOUND;
1086                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1087                                &net_ip, get_timer(bootp_start));
1088                         net_set_timeout_handler(0, (thand_f *)0);
1089                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1090                                             "bootp_stop");
1091
1092                         net_auto_load();
1093                         return;
1094                 }
1095                 break;
1096         case BOUND:
1097                 /* DHCP client bound to address */
1098                 break;
1099         default:
1100                 puts("DHCP: INVALID STATE\n");
1101                 break;
1102         }
1103 }
1104
1105 void dhcp_request(void)
1106 {
1107         bootp_request();
1108 }
1109 #endif  /* CONFIG_CMD_DHCP */