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, [email protected]
   9  */
  10
  11 #include <common.h>
  12 #include <bootstage.h>
  13 #include <command.h>
  14 #include <env.h>
  15 #include <efi_loader.h>
  16 #include <log.h>
  17 #include <net.h>
  18 #include <rand.h>
  19 #include <uuid.h>
  20 #include <linux/delay.h>
  21 #include <net/tftp.h>
  22 #include "bootp.h"
  23 #ifdef CONFIG_LED_STATUS
  24 #include <status_led.h>
  25 #endif
  26 #ifdef CONFIG_BOOTP_RANDOM_DELAY
  27 #include "net_rand.h"
  28 #endif
  29
  30 #define BOOTP_VENDOR_MAGIC      0x63825363      /* RFC1048 Magic Cookie */
  31
  32 /*
  33  * The timeout for the initial BOOTP/DHCP request used to be described by a
  34  * counter of fixed-length timeout periods. TIMEOUT_COUNT represents
  35  * that counter
  36  *
  37  * Now that the timeout periods are variable (exponential backoff and retry)
  38  * we convert the timeout count to the absolute time it would have take to
  39  * execute that many retries, and keep sending retry packets until that time
  40  * is reached.
  41  */
  42 #ifndef CONFIG_NET_RETRY_COUNT
  43 # define TIMEOUT_COUNT  5               /* # of timeouts before giving up */
  44 #else
  45 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT)
  46 #endif
  47 #define TIMEOUT_MS      ((3 + (TIMEOUT_COUNT * 5)) * 1000)
  48
  49 #define PORT_BOOTPS     67              /* BOOTP server UDP port */
  50 #define PORT_BOOTPC     68              /* BOOTP client UDP port */
  51
  52 #ifndef CONFIG_DHCP_MIN_EXT_LEN         /* minimal length of extension list */
  53 #define CONFIG_DHCP_MIN_EXT_LEN 64
  54 #endif
  55
  56 #ifndef CONFIG_BOOTP_ID_CACHE_SIZE
  57 #define CONFIG_BOOTP_ID_CACHE_SIZE 4
  58 #endif
  59
  60 u32             bootp_ids[CONFIG_BOOTP_ID_CACHE_SIZE];
  61 unsigned int    bootp_num_ids;
  62 int             bootp_try;
  63 ulong           bootp_start;
  64 ulong           bootp_timeout;
  65 char net_nis_domain[32] = {0,}; /* Our NIS domain */
  66 char net_hostname[32] = {0,}; /* Our hostname */
  67 char net_root_path[64] = {0,}; /* Our bootpath */
  68
  69 static ulong time_taken_max;
  70
  71 #if defined(CONFIG_CMD_DHCP)
  72 static dhcp_state_t dhcp_state = INIT;
  73 static u32 dhcp_leasetime;
  74 static struct in_addr dhcp_server_ip;
  75 static u8 dhcp_option_overload;
  76 #define OVERLOAD_FILE 1
  77 #define OVERLOAD_SNAME 2
  78 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
  79                         unsigned src, unsigned len);
  80
  81 /* For Debug */
  82 #if 0
  83 static char *dhcpmsg2str(int type)
  84 {
  85         switch (type) {
  86         case 1:  return "DHCPDISCOVER"; break;
  87         case 2:  return "DHCPOFFER";    break;
  88         case 3:  return "DHCPREQUEST";  break;
  89         case 4:  return "DHCPDECLINE";  break;
  90         case 5:  return "DHCPACK";      break;
  91         case 6:  return "DHCPNACK";     break;
  92         case 7:  return "DHCPRELEASE";  break;
  93         default: return "UNKNOWN/INVALID MSG TYPE"; break;
  94         }
  95 }
  96 #endif
  97 #endif
  98
  99 static void bootp_add_id(ulong id)
 100 {
 101         if (bootp_num_ids >= ARRAY_SIZE(bootp_ids)) {
 102                 size_t size = sizeof(bootp_ids) - sizeof(id);
 103
 104                 memmove(bootp_ids, &bootp_ids[1], size);
 105                 bootp_ids[bootp_num_ids - 1] = id;
 106         } else {
 107                 bootp_ids[bootp_num_ids] = id;
 108                 bootp_num_ids++;
 109         }
 110 }
 111
 112 static bool bootp_match_id(ulong id)
 113 {
 114         unsigned int i;
 115
 116         for (i = 0; i < bootp_num_ids; i++)
 117                 if (bootp_ids[i] == id)
 118                         return true;
 119
 120         return false;
 121 }
 122
 123 static int check_reply_packet(uchar *pkt, unsigned dest, unsigned src,
 124                               unsigned len)
 125 {
 126         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
 127         int retval = 0;
 128
 129         if (dest != PORT_BOOTPC || src != PORT_BOOTPS)
 130                 retval = -1;
 131         else if (len < sizeof(struct bootp_hdr) - OPT_FIELD_SIZE)
 132                 retval = -2;
 133         else if (bp->bp_op != OP_BOOTREPLY)
 134                 retval = -3;
 135         else if (bp->bp_htype != HWT_ETHER)
 136                 retval = -4;
 137         else if (bp->bp_hlen != HWL_ETHER)
 138                 retval = -5;
 139         else if (!bootp_match_id(net_read_u32(&bp->bp_id)))
 140                 retval = -6;
 141         else if (memcmp(bp->bp_chaddr, net_ethaddr, HWL_ETHER) != 0)
 142                 retval = -7;
 143
 144         debug("Filtering pkt = %d\n", retval);
 145
 146         return retval;
 147 }
 148
 149 static void store_bootp_params(struct bootp_hdr *bp)
 150 {
 151         struct in_addr tmp_ip;
 152         bool overwrite_serverip = true;
 153
 154         if (IS_ENABLED(CONFIG_BOOTP_SERVERIP))
 155                 return;
 156
 157 #if defined(CONFIG_BOOTP_PREFER_SERVERIP)
 158         overwrite_serverip = false;
 159 #endif
 160
 161         net_copy_ip(&tmp_ip, &bp->bp_siaddr);
 162         if (tmp_ip.s_addr != 0 && (overwrite_serverip || !net_server_ip.s_addr))
 163                 net_copy_ip(&net_server_ip, &bp->bp_siaddr);
 164         memcpy(net_server_ethaddr,
 165                ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
 166         if (
 167 #if defined(CONFIG_CMD_DHCP)
 168             !(dhcp_option_overload & OVERLOAD_FILE) &&
 169 #endif
 170             (strlen(bp->bp_file) > 0) &&
 171             !net_boot_file_name_explicit) {
 172                 copy_filename(net_boot_file_name, bp->bp_file,
 173                               sizeof(net_boot_file_name));
 174         }
 175
 176         debug("net_boot_file_name: %s\n", net_boot_file_name);
 177
 178         /* Propagate to environment:
 179          * don't delete exising entry when BOOTP / DHCP reply does
 180          * not contain a new value
 181          */
 182         if (*net_boot_file_name)
 183                 env_set("bootfile", net_boot_file_name);
 184 }
 185
 186 /*
 187  * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 188  */
 189 static void store_net_params(struct bootp_hdr *bp)
 190 {
 191 #if !defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
 192         store_bootp_params(bp);
 193 #endif
 194         net_copy_ip(&net_ip, &bp->bp_yiaddr);
 195 }
 196
 197 static int truncate_sz(const char *name, int maxlen, int curlen)
 198 {
 199         if (curlen >= maxlen) {
 200                 printf("*** WARNING: %s is too long (%d - max: %d)"
 201                         " - truncated\n", name, curlen, maxlen);
 202                 curlen = maxlen - 1;
 203         }
 204         return curlen;
 205 }
 206
 207 #if !defined(CONFIG_CMD_DHCP)
 208
 209 static void bootp_process_vendor_field(u8 *ext)
 210 {
 211         int size = *(ext + 1);
 212
 213         debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
 214               *(ext + 1));
 215
 216         net_boot_file_expected_size_in_blocks = 0;
 217
 218         switch (*ext) {
 219                 /* Fixed length fields */
 220         case 1:                 /* Subnet mask */
 221                 if (net_netmask.s_addr == 0)
 222                         net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
 223                 break;
 224         case 2:                 /* Time offset - Not yet supported */
 225                 break;
 226                 /* Variable length fields */
 227         case 3:                 /* Gateways list */
 228                 if (net_gateway.s_addr == 0)
 229                         net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
 230                 break;
 231         case 4:                 /* Time server - Not yet supported */
 232                 break;
 233         case 5:                 /* IEN-116 name server - Not yet supported */
 234                 break;
 235         case 6:
 236                 if (net_dns_server.s_addr == 0)
 237                         net_copy_ip(&net_dns_server,
 238                                     (struct in_addr *)(ext + 2));
 239 #if defined(CONFIG_BOOTP_DNS2)
 240                 if ((net_dns_server2.s_addr == 0) && (size > 4))
 241                         net_copy_ip(&net_dns_server2,
 242                                     (struct in_addr *)(ext + 2 + 4));
 243 #endif
 244                 break;
 245         case 7:                 /* Log server - Not yet supported */
 246                 break;
 247         case 8:                 /* Cookie/Quote server - Not yet supported */
 248                 break;
 249         case 9:                 /* LPR server - Not yet supported */
 250                 break;
 251         case 10:                /* Impress server - Not yet supported */
 252                 break;
 253         case 11:                /* RPL server - Not yet supported */
 254                 break;
 255         case 12:                /* Host name */
 256                 if (net_hostname[0] == 0) {
 257                         size = truncate_sz("Host Name",
 258                                 sizeof(net_hostname), size);
 259                         memcpy(&net_hostname, ext + 2, size);
 260                         net_hostname[size] = 0;
 261                 }
 262                 break;
 263         case 13:                /* Boot file size */
 264                 if (size == 2)
 265                         net_boot_file_expected_size_in_blocks =
 266                                 ntohs(*(ushort *)(ext + 2));
 267                 else if (size == 4)
 268                         net_boot_file_expected_size_in_blocks =
 269                                 ntohl(*(ulong *)(ext + 2));
 270                 break;
 271         case 14:                /* Merit dump file - Not yet supported */
 272                 break;
 273         case 15:                /* Domain name - Not yet supported */
 274                 break;
 275         case 16:                /* Swap server - Not yet supported */
 276                 break;
 277         case 17:                /* Root path */
 278                 if (net_root_path[0] == 0) {
 279                         size = truncate_sz("Root Path",
 280                                 sizeof(net_root_path), size);
 281                         memcpy(&net_root_path, ext + 2, size);
 282                         net_root_path[size] = 0;
 283                 }
 284                 break;
 285         case 18:                /* Extension path - Not yet supported */
 286                 /*
 287                  * This can be used to send the information of the
 288                  * vendor area in another file that the client can
 289                  * access via TFTP.
 290                  */
 291                 break;
 292                 /* IP host layer fields */
 293         case 40:                /* NIS Domain name */
 294                 if (net_nis_domain[0] == 0) {
 295                         size = truncate_sz("NIS Domain Name",
 296                                 sizeof(net_nis_domain), size);
 297                         memcpy(&net_nis_domain, ext + 2, size);
 298                         net_nis_domain[size] = 0;
 299                 }
 300                 break;
 301 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 302         case 42:        /* NTP server IP */
 303                 net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
 304                 break;
 305 #endif
 306                 /* Application layer fields */
 307         case 43:                /* Vendor specific info - Not yet supported */
 308                 /*
 309                  * Binary information to exchange specific
 310                  * product information.
 311                  */
 312                 break;
 313                 /* Reserved (custom) fields (128..254) */
 314         }
 315 }
 316
 317 static void bootp_process_vendor(u8 *ext, int size)
 318 {
 319         u8 *end = ext + size;
 320
 321         debug("[BOOTP] Checking extension (%d bytes)...\n", size);
 322
 323         while ((ext < end) && (*ext != 0xff)) {
 324                 if (*ext == 0) {
 325                         ext++;
 326                 } else {
 327                         u8 *opt = ext;
 328
 329                         ext += ext[1] + 2;
 330                         if (ext <= end)
 331                                 bootp_process_vendor_field(opt);
 332                 }
 333         }
 334
 335         debug("[BOOTP] Received fields:\n");
 336         if (net_netmask.s_addr)
 337                 debug("net_netmask : %pI4\n", &net_netmask);
 338
 339         if (net_gateway.s_addr)
 340                 debug("net_gateway      : %pI4", &net_gateway);
 341
 342         if (net_boot_file_expected_size_in_blocks)
 343                 debug("net_boot_file_expected_size_in_blocks : %d\n",
 344                       net_boot_file_expected_size_in_blocks);
 345
 346         if (net_hostname[0])
 347                 debug("net_hostname  : %s\n", net_hostname);
 348
 349         if (net_root_path[0])
 350                 debug("net_root_path  : %s\n", net_root_path);
 351
 352         if (net_nis_domain[0])
 353                 debug("net_nis_domain : %s\n", net_nis_domain);
 354
 355 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 356         if (net_ntp_server.s_addr)
 357                 debug("net_ntp_server : %pI4\n", &net_ntp_server);
 358 #endif
 359 }
 360
 361 /*
 362  *      Handle a BOOTP received packet.
 363  */
 364 static void bootp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 365                           unsigned src, unsigned len)
 366 {
 367         struct bootp_hdr *bp;
 368
 369         debug("got BOOTP packet (src=%d, dst=%d, len=%d want_len=%zu)\n",
 370               src, dest, len, sizeof(struct bootp_hdr));
 371
 372         bp = (struct bootp_hdr *)pkt;
 373
 374         /* Filter out pkts we don't want */
 375         if (check_reply_packet(pkt, dest, src, len))
 376                 return;
 377
 378         /*
 379          *      Got a good BOOTP reply.  Copy the data into our variables.
 380          */
 381 #if defined(CONFIG_LED_STATUS) && defined(CONFIG_LED_STATUS_BOOT_ENABLE)
 382         status_led_set(CONFIG_LED_STATUS_BOOT, CONFIG_LED_STATUS_OFF);
 383 #endif
 384
 385         store_net_params(bp);           /* Store net parameters from reply */
 386
 387         /* Retrieve extended information (we must parse the vendor area) */
 388         if (net_read_u32((u32 *)&bp->bp_vend[0]) == htonl(BOOTP_VENDOR_MAGIC))
 389                 bootp_process_vendor((uchar *)&bp->bp_vend[4], len);
 390
 391         net_set_timeout_handler(0, (thand_f *)0);
 392         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP, "bootp_stop");
 393
 394         debug("Got good BOOTP\n");
 395
 396         net_auto_load();
 397 }
 398 #endif
 399
 400 /*
 401  *      Timeout on BOOTP/DHCP request.
 402  */
 403 static void bootp_timeout_handler(void)
 404 {
 405         ulong time_taken = get_timer(bootp_start);
 406
 407         if (time_taken >= time_taken_max) {
 408 #ifdef CONFIG_BOOTP_MAY_FAIL
 409                 char *ethrotate;
 410
 411                 ethrotate = env_get("ethrotate");
 412                 if ((ethrotate && strcmp(ethrotate, "no") == 0) ||
 413                     net_restart_wrap) {
 414                         puts("\nRetry time exceeded\n");
 415                         net_set_state(NETLOOP_FAIL);
 416                 } else
 417 #endif
 418                 {
 419                         puts("\nRetry time exceeded; starting again\n");
 420                         net_start_again();
 421                 }
 422         } else {
 423                 bootp_timeout *= 2;
 424                 if (bootp_timeout > 2000)
 425                         bootp_timeout = 2000;
 426                 net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 427                 bootp_request();
 428         }
 429 }
 430
 431 #define put_vci(e, str)                                         \
 432         do {                                                    \
 433                 size_t vci_strlen = strlen(str);                \
 434                 *e++ = 60;      /* Vendor Class Identifier */   \
 435                 *e++ = vci_strlen;                              \
 436                 memcpy(e, str, vci_strlen);                     \
 437                 e += vci_strlen;                                \
 438         } while (0)
 439
 440 static u8 *add_vci(u8 *e)
 441 {
 442         char *vci = NULL;
 443         char *env_vci = env_get("bootp_vci");
 444
 445 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_NET_VCI_STRING)
 446         vci = CONFIG_SPL_NET_VCI_STRING;
 447 #elif defined(CONFIG_BOOTP_VCI_STRING)
 448         vci = CONFIG_BOOTP_VCI_STRING;
 449 #endif
 450
 451         if (env_vci)
 452                 vci = env_vci;
 453
 454         if (vci)
 455                 put_vci(e, vci);
 456
 457         return e;
 458 }
 459
 460 /*
 461  *      Initialize BOOTP extension fields in the request.
 462  */
 463 #if defined(CONFIG_CMD_DHCP)
 464 static int dhcp_extended(u8 *e, int message_type, struct in_addr server_ip,
 465                         struct in_addr requested_ip)
 466 {
 467         u8 *start = e;
 468         u8 *cnt;
 469 #ifdef CONFIG_LIB_UUID
 470         char *uuid;
 471 #endif
 472         int clientarch = -1;
 473
 474 #if defined(CONFIG_BOOTP_VENDOREX)
 475         u8 *x;
 476 #endif
 477 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 478         char *hostname;
 479 #endif
 480
 481         *e++ = 99;              /* RFC1048 Magic Cookie */
 482         *e++ = 130;
 483         *e++ = 83;
 484         *e++ = 99;
 485
 486         *e++ = 53;              /* DHCP Message Type */
 487         *e++ = 1;
 488         *e++ = message_type;
 489
 490         *e++ = 57;              /* Maximum DHCP Message Size */
 491         *e++ = 2;
 492         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 8;
 493         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 494
 495         if (server_ip.s_addr) {
 496                 int tmp = ntohl(server_ip.s_addr);
 497
 498                 *e++ = 54;      /* ServerID */
 499                 *e++ = 4;
 500                 *e++ = tmp >> 24;
 501                 *e++ = tmp >> 16;
 502                 *e++ = tmp >> 8;
 503                 *e++ = tmp & 0xff;
 504         }
 505
 506         if (requested_ip.s_addr) {
 507                 int tmp = ntohl(requested_ip.s_addr);
 508
 509                 *e++ = 50;      /* Requested IP */
 510                 *e++ = 4;
 511                 *e++ = tmp >> 24;
 512                 *e++ = tmp >> 16;
 513                 *e++ = tmp >> 8;
 514                 *e++ = tmp & 0xff;
 515         }
 516 #if defined(CONFIG_BOOTP_SEND_HOSTNAME)
 517         hostname = env_get("hostname");
 518         if (hostname) {
 519                 int hostnamelen = strlen(hostname);
 520
 521                 *e++ = 12;      /* Hostname */
 522                 *e++ = hostnamelen;
 523                 memcpy(e, hostname, hostnamelen);
 524                 e += hostnamelen;
 525         }
 526 #endif
 527
 528 #ifdef CONFIG_BOOTP_PXE_CLIENTARCH
 529         clientarch = CONFIG_BOOTP_PXE_CLIENTARCH;
 530 #endif
 531
 532         if (env_get("bootp_arch"))
 533                 clientarch = env_get_ulong("bootp_arch", 16, clientarch);
 534
 535         if (clientarch > 0) {
 536                 *e++ = 93;      /* Client System Architecture */
 537                 *e++ = 2;
 538                 *e++ = (clientarch >> 8) & 0xff;
 539                 *e++ = clientarch & 0xff;
 540         }
 541
 542         *e++ = 94;      /* Client Network Interface Identifier */
 543         *e++ = 3;
 544         *e++ = 1;       /* type field for UNDI */
 545         *e++ = 0;       /* major revision */
 546         *e++ = 0;       /* minor revision */
 547
 548 #ifdef CONFIG_LIB_UUID
 549         uuid = env_get("pxeuuid");
 550
 551         if (uuid) {
 552                 if (uuid_str_valid(uuid)) {
 553                         *e++ = 97;      /* Client Machine Identifier */
 554                         *e++ = 17;
 555                         *e++ = 0;       /* type 0 - UUID */
 556
 557                         uuid_str_to_bin(uuid, e, UUID_STR_FORMAT_STD);
 558                         e += 16;
 559                 } else {
 560                         printf("Invalid pxeuuid: %s\n", uuid);
 561                 }
 562         }
 563 #endif
 564
 565         e = add_vci(e);
 566
 567 #if defined(CONFIG_BOOTP_VENDOREX)
 568         x = dhcp_vendorex_prep(e);
 569         if (x)
 570                 return x - start;
 571 #endif
 572
 573         *e++ = 55;              /* Parameter Request List */
 574          cnt = e++;             /* Pointer to count of requested items */
 575         *cnt = 0;
 576 #if defined(CONFIG_BOOTP_SUBNETMASK)
 577         *e++  = 1;              /* Subnet Mask */
 578         *cnt += 1;
 579 #endif
 580 #if defined(CONFIG_BOOTP_TIMEOFFSET)
 581         *e++  = 2;
 582         *cnt += 1;
 583 #endif
 584 #if defined(CONFIG_BOOTP_GATEWAY)
 585         *e++  = 3;              /* Router Option */
 586         *cnt += 1;
 587 #endif
 588 #if defined(CONFIG_BOOTP_DNS)
 589         *e++  = 6;              /* DNS Server(s) */
 590         *cnt += 1;
 591 #endif
 592 #if defined(CONFIG_BOOTP_HOSTNAME)
 593         *e++  = 12;             /* Hostname */
 594         *cnt += 1;
 595 #endif
 596 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 597         *e++  = 13;             /* Boot File Size */
 598         *cnt += 1;
 599 #endif
 600 #if defined(CONFIG_BOOTP_BOOTPATH)
 601         *e++  = 17;             /* Boot path */
 602         *cnt += 1;
 603 #endif
 604 #if defined(CONFIG_BOOTP_NISDOMAIN)
 605         *e++  = 40;             /* NIS Domain name request */
 606         *cnt += 1;
 607 #endif
 608 #if defined(CONFIG_BOOTP_NTPSERVER)
 609         *e++  = 42;
 610         *cnt += 1;
 611 #endif
 612         /* no options, so back up to avoid sending an empty request list */
 613         if (*cnt == 0)
 614                 e -= 2;
 615
 616         *e++  = 255;            /* End of the list */
 617
 618         /* Pad to minimal length */
 619 #ifdef  CONFIG_DHCP_MIN_EXT_LEN
 620         while ((e - start) < CONFIG_DHCP_MIN_EXT_LEN)
 621                 *e++ = 0;
 622 #endif
 623
 624         return e - start;
 625 }
 626
 627 #else
 628 /*
 629  * Warning: no field size check - change CONFIG_BOOTP_* at your own risk!
 630  */
 631 static int bootp_extended(u8 *e)
 632 {
 633         u8 *start = e;
 634
 635         *e++ = 99;              /* RFC1048 Magic Cookie */
 636         *e++ = 130;
 637         *e++ = 83;
 638         *e++ = 99;
 639
 640 #if defined(CONFIG_CMD_DHCP)
 641         *e++ = 53;              /* DHCP Message Type */
 642         *e++ = 1;
 643         *e++ = DHCP_DISCOVER;
 644
 645         *e++ = 57;              /* Maximum DHCP Message Size */
 646         *e++ = 2;
 647         *e++ = (576 - 312 + OPT_FIELD_SIZE) >> 16;
 648         *e++ = (576 - 312 + OPT_FIELD_SIZE) & 0xff;
 649 #endif
 650
 651         e = add_vci(e);
 652
 653 #if defined(CONFIG_BOOTP_SUBNETMASK)
 654         *e++ = 1;               /* Subnet mask request */
 655         *e++ = 4;
 656         e   += 4;
 657 #endif
 658
 659 #if defined(CONFIG_BOOTP_GATEWAY)
 660         *e++ = 3;               /* Default gateway request */
 661         *e++ = 4;
 662         e   += 4;
 663 #endif
 664
 665 #if defined(CONFIG_BOOTP_DNS)
 666         *e++ = 6;               /* Domain Name Server */
 667         *e++ = 4;
 668         e   += 4;
 669 #endif
 670
 671 #if defined(CONFIG_BOOTP_HOSTNAME)
 672         *e++ = 12;              /* Host name request */
 673         *e++ = 32;
 674         e   += 32;
 675 #endif
 676
 677 #if defined(CONFIG_BOOTP_BOOTFILESIZE)
 678         *e++ = 13;              /* Boot file size */
 679         *e++ = 2;
 680         e   += 2;
 681 #endif
 682
 683 #if defined(CONFIG_BOOTP_BOOTPATH)
 684         *e++ = 17;              /* Boot path */
 685         *e++ = 32;
 686         e   += 32;
 687 #endif
 688
 689 #if defined(CONFIG_BOOTP_NISDOMAIN)
 690         *e++ = 40;              /* NIS Domain name request */
 691         *e++ = 32;
 692         e   += 32;
 693 #endif
 694 #if defined(CONFIG_BOOTP_NTPSERVER)
 695         *e++ = 42;
 696         *e++ = 4;
 697         e   += 4;
 698 #endif
 699
 700         *e++ = 255;             /* End of the list */
 701
 702         /*
 703          * If nothing in list, remove it altogether. Some DHCP servers get
 704          * upset by this minor faux pas and do not respond at all.
 705          */
 706         if (e == start + 3) {
 707                 printf("*** Warning: no DHCP options requested\n");
 708                 e -= 3;
 709         }
 710
 711         return e - start;
 712 }
 713 #endif
 714
 715 void bootp_reset(void)
 716 {
 717         bootp_num_ids = 0;
 718         bootp_try = 0;
 719         bootp_start = get_timer(0);
 720         bootp_timeout = 250;
 721 }
 722
 723 void bootp_request(void)
 724 {
 725         uchar *pkt, *iphdr;
 726         struct bootp_hdr *bp;
 727         int extlen, pktlen, iplen;
 728         int eth_hdr_size;
 729 #ifdef CONFIG_BOOTP_RANDOM_DELAY
 730         ulong rand_ms;
 731 #endif
 732         u32 bootp_id;
 733         struct in_addr zero_ip;
 734         struct in_addr bcast_ip;
 735         char *ep;  /* Environment pointer */
 736
 737         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_START, "bootp_start");
 738 #if defined(CONFIG_CMD_DHCP)
 739         dhcp_state = INIT;
 740 #endif
 741
 742         ep = env_get("bootpretryperiod");
 743         if (ep != NULL)
 744                 time_taken_max = dectoul(ep, NULL);
 745         else
 746                 time_taken_max = TIMEOUT_MS;
 747
 748 #ifdef CONFIG_BOOTP_RANDOM_DELAY                /* Random BOOTP delay */
 749         if (bootp_try == 0)
 750                 srand_mac();
 751
 752         if (bootp_try <= 2)     /* Start with max 1024 * 1ms */
 753                 rand_ms = rand() >> (22 - bootp_try);
 754         else            /* After 3rd BOOTP request max 8192 * 1ms */
 755                 rand_ms = rand() >> 19;
 756
 757         printf("Random delay: %ld ms...\n", rand_ms);
 758         mdelay(rand_ms);
 759
 760 #endif  /* CONFIG_BOOTP_RANDOM_DELAY */
 761
 762         printf("BOOTP broadcast %d\n", ++bootp_try);
 763         pkt = net_tx_packet;
 764         memset((void *)pkt, 0, PKTSIZE);
 765
 766         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 767         pkt += eth_hdr_size;
 768
 769         /*
 770          * Next line results in incorrect packet size being transmitted,
 771          * resulting in errors in some DHCP servers, reporting missing bytes.
 772          * Size must be set in packet header after extension length has been
 773          * determined.
 774          * C. Hallinan, DS4.COM, Inc.
 775          */
 776         /* net_set_udp_header(pkt, 0xFFFFFFFFL, PORT_BOOTPS, PORT_BOOTPC,
 777                 sizeof (struct bootp_hdr)); */
 778         iphdr = pkt;    /* We need this later for net_set_udp_header() */
 779         pkt += IP_UDP_HDR_SIZE;
 780
 781         bp = (struct bootp_hdr *)pkt;
 782         bp->bp_op = OP_BOOTREQUEST;
 783         bp->bp_htype = HWT_ETHER;
 784         bp->bp_hlen = HWL_ETHER;
 785         bp->bp_hops = 0;
 786         /*
 787          * according to RFC1542, should be 0 on first request, secs since
 788          * first request otherwise
 789          */
 790         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
 791         zero_ip.s_addr = 0;
 792         net_write_ip(&bp->bp_ciaddr, zero_ip);
 793         net_write_ip(&bp->bp_yiaddr, zero_ip);
 794         net_write_ip(&bp->bp_siaddr, zero_ip);
 795         net_write_ip(&bp->bp_giaddr, zero_ip);
 796         memcpy(bp->bp_chaddr, net_ethaddr, 6);
 797         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
 798
 799         /* Request additional information from the BOOTP/DHCP server */
 800 #if defined(CONFIG_CMD_DHCP)
 801         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_DISCOVER, zero_ip,
 802                                zero_ip);
 803 #else
 804         extlen = bootp_extended((u8 *)bp->bp_vend);
 805 #endif
 806
 807         /*
 808          *      Bootp ID is the lower 4 bytes of our ethernet address
 809          *      plus the current time in ms.
 810          */
 811         bootp_id = ((u32)net_ethaddr[2] << 24)
 812                 | ((u32)net_ethaddr[3] << 16)
 813                 | ((u32)net_ethaddr[4] << 8)
 814                 | (u32)net_ethaddr[5];
 815         bootp_id += get_timer(0);
 816         bootp_id = htonl(bootp_id);
 817         bootp_add_id(bootp_id);
 818         net_copy_u32(&bp->bp_id, &bootp_id);
 819
 820         /*
 821          * Calculate proper packet lengths taking into account the
 822          * variable size of the options field
 823          */
 824         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
 825         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
 826         bcast_ip.s_addr = 0xFFFFFFFFL;
 827         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
 828         net_set_timeout_handler(bootp_timeout, bootp_timeout_handler);
 829
 830 #if defined(CONFIG_CMD_DHCP)
 831         dhcp_state = SELECTING;
 832         net_set_udp_handler(dhcp_handler);
 833 #else
 834         net_set_udp_handler(bootp_handler);
 835 #endif
 836         net_send_packet(net_tx_packet, pktlen);
 837 }
 838
 839 #if defined(CONFIG_CMD_DHCP)
 840 static void dhcp_process_options(uchar *popt, uchar *end)
 841 {
 842         int oplen, size;
 843 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 844         int *to_ptr;
 845 #endif
 846
 847         while (popt < end && *popt != 0xff) {
 848                 oplen = *(popt + 1);
 849                 switch (*popt) {
 850                 case 0:
 851                         oplen = -1; /* Pad omits len byte */
 852                         break;
 853                 case 1:
 854                         net_copy_ip(&net_netmask, (popt + 2));
 855                         break;
 856 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_TIMEOFFSET)
 857                 case 2:         /* Time offset  */
 858                         to_ptr = &net_ntp_time_offset;
 859                         net_copy_u32((u32 *)to_ptr, (u32 *)(popt + 2));
 860                         net_ntp_time_offset = ntohl(net_ntp_time_offset);
 861                         break;
 862 #endif
 863                 case 3:
 864                         net_copy_ip(&net_gateway, (popt + 2));
 865                         break;
 866                 case 6:
 867                         net_copy_ip(&net_dns_server, (popt + 2));
 868 #if defined(CONFIG_BOOTP_DNS2)
 869                         if (*(popt + 1) > 4)
 870                                 net_copy_ip(&net_dns_server2, (popt + 2 + 4));
 871 #endif
 872                         break;
 873                 case 12:
 874                         size = truncate_sz("Host Name",
 875                                 sizeof(net_hostname), oplen);
 876                         memcpy(&net_hostname, popt + 2, size);
 877                         net_hostname[size] = 0;
 878                         break;
 879                 case 15:        /* Ignore Domain Name Option */
 880                         break;
 881                 case 17:
 882                         size = truncate_sz("Root Path",
 883                                 sizeof(net_root_path), oplen);
 884                         memcpy(&net_root_path, popt + 2, size);
 885                         net_root_path[size] = 0;
 886                         break;
 887                 case 28:        /* Ignore Broadcast Address Option */
 888                         break;
 889 #if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
 890                 case 42:        /* NTP server IP */
 891                         net_copy_ip(&net_ntp_server, (popt + 2));
 892                         break;
 893 #endif
 894                 case 51:
 895                         net_copy_u32(&dhcp_leasetime, (u32 *)(popt + 2));
 896                         break;
 897                 case 52:
 898                         dhcp_option_overload = popt[2];
 899                         break;
 900                 case 53:        /* Ignore Message Type Option */
 901                         break;
 902                 case 54:
 903                         net_copy_ip(&dhcp_server_ip, (popt + 2));
 904                         break;
 905                 case 58:        /* Ignore Renewal Time Option */
 906                         break;
 907                 case 59:        /* Ignore Rebinding Time Option */
 908                         break;
 909                 case 66:        /* Ignore TFTP server name */
 910                         break;
 911                 case 67:        /* Bootfile option */
 912                         if (!net_boot_file_name_explicit) {
 913                                 size = truncate_sz("Bootfile",
 914                                                    sizeof(net_boot_file_name),
 915                                                    oplen);
 916                                 memcpy(&net_boot_file_name, popt + 2, size);
 917                                 net_boot_file_name[size] = 0;
 918                         }
 919                         break;
 920                 default:
 921 #if defined(CONFIG_BOOTP_VENDOREX)
 922                         if (dhcp_vendorex_proc(popt))
 923                                 break;
 924 #endif
 925                         printf("*** Unhandled DHCP Option in OFFER/ACK:"
 926                                " %d\n", *popt);
 927                         break;
 928                 }
 929                 popt += oplen + 2;      /* Process next option */
 930         }
 931 }
 932
 933 static void dhcp_packet_process_options(struct bootp_hdr *bp)
 934 {
 935         uchar *popt = (uchar *)&bp->bp_vend[4];
 936         uchar *end = popt + BOOTP_HDR_SIZE;
 937
 938         if (net_read_u32((u32 *)&bp->bp_vend[0]) != htonl(BOOTP_VENDOR_MAGIC))
 939                 return;
 940
 941         dhcp_option_overload = 0;
 942
 943         /*
 944          * The 'options' field MUST be interpreted first, 'file' next,
 945          * 'sname' last.
 946          */
 947         dhcp_process_options(popt, end);
 948
 949         if (dhcp_option_overload & OVERLOAD_FILE) {
 950                 popt = (uchar *)bp->bp_file;
 951                 end = popt + sizeof(bp->bp_file);
 952                 dhcp_process_options(popt, end);
 953         }
 954
 955         if (dhcp_option_overload & OVERLOAD_SNAME) {
 956                 popt = (uchar *)bp->bp_sname;
 957                 end = popt + sizeof(bp->bp_sname);
 958                 dhcp_process_options(popt, end);
 959         }
 960 }
 961
 962 static int dhcp_message_type(unsigned char *popt)
 963 {
 964         if (net_read_u32((u32 *)popt) != htonl(BOOTP_VENDOR_MAGIC))
 965                 return -1;
 966
 967         popt += 4;
 968         while (*popt != 0xff) {
 969                 if (*popt == 53)        /* DHCP Message Type */
 970                         return *(popt + 2);
 971                 if (*popt == 0) {
 972                         /* Pad */
 973                         popt += 1;
 974                 } else {
 975                         /* Scan through all options */
 976                         popt += *(popt + 1) + 2;
 977                 }
 978         }
 979         return -1;
 980 }
 981
 982 static void dhcp_send_request_packet(struct bootp_hdr *bp_offer)
 983 {
 984         uchar *pkt, *iphdr;
 985         struct bootp_hdr *bp;
 986         int pktlen, iplen, extlen;
 987         int eth_hdr_size;
 988         struct in_addr offered_ip;
 989         struct in_addr zero_ip;
 990         struct in_addr bcast_ip;
 991
 992         debug("dhcp_send_request_packet: Sending DHCPREQUEST\n");
 993         pkt = net_tx_packet;
 994         memset((void *)pkt, 0, PKTSIZE);
 995
 996         eth_hdr_size = net_set_ether(pkt, net_bcast_ethaddr, PROT_IP);
 997         pkt += eth_hdr_size;
 998
 999         iphdr = pkt;    /* We'll need this later to set proper pkt size */
1000         pkt += IP_UDP_HDR_SIZE;
1001
1002         bp = (struct bootp_hdr *)pkt;
1003         bp->bp_op = OP_BOOTREQUEST;
1004         bp->bp_htype = HWT_ETHER;
1005         bp->bp_hlen = HWL_ETHER;
1006         bp->bp_hops = 0;
1007         bp->bp_secs = htons(get_timer(bootp_start) / 1000);
1008         /* Do not set the client IP, your IP, or server IP yet, since it
1009          * hasn't been ACK'ed by the server yet */
1010
1011         /*
1012          * RFC3046 requires Relay Agents to discard packets with
1013          * nonzero and offered giaddr
1014          */
1015         zero_ip.s_addr = 0;
1016         net_write_ip(&bp->bp_giaddr, zero_ip);
1017
1018         memcpy(bp->bp_chaddr, net_ethaddr, 6);
1019         copy_filename(bp->bp_file, net_boot_file_name, sizeof(bp->bp_file));
1020
1021         /*
1022          * ID is the id of the OFFER packet
1023          */
1024
1025         net_copy_u32(&bp->bp_id, &bp_offer->bp_id);
1026
1027         /*
1028          * Copy options from OFFER packet if present
1029          */
1030
1031         /* Copy offered IP into the parameters request list */
1032         net_copy_ip(&offered_ip, &bp_offer->bp_yiaddr);
1033         extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST,
1034                 dhcp_server_ip, offered_ip);
1035
1036         iplen = BOOTP_HDR_SIZE - OPT_FIELD_SIZE + extlen;
1037         pktlen = eth_hdr_size + IP_UDP_HDR_SIZE + iplen;
1038         bcast_ip.s_addr = 0xFFFFFFFFL;
1039         net_set_udp_header(iphdr, bcast_ip, PORT_BOOTPS, PORT_BOOTPC, iplen);
1040
1041 #ifdef CONFIG_BOOTP_DHCP_REQUEST_DELAY
1042         udelay(CONFIG_BOOTP_DHCP_REQUEST_DELAY);
1043 #endif  /* CONFIG_BOOTP_DHCP_REQUEST_DELAY */
1044         debug("Transmitting DHCPREQUEST packet: len = %d\n", pktlen);
1045         net_send_packet(net_tx_packet, pktlen);
1046 }
1047
1048 /*
1049  *      Handle DHCP received packets.
1050  */
1051 static void dhcp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
1052                          unsigned src, unsigned len)
1053 {
1054         struct bootp_hdr *bp = (struct bootp_hdr *)pkt;
1055
1056         debug("DHCPHandler: got packet: (src=%d, dst=%d, len=%d) state: %d\n",
1057               src, dest, len, dhcp_state);
1058
1059         /* Filter out pkts we don't want */
1060         if (check_reply_packet(pkt, dest, src, len))
1061                 return;
1062
1063         debug("DHCPHandler: got DHCP packet: (src=%d, dst=%d, len=%d) state: "
1064               "%d\n", src, dest, len, dhcp_state);
1065
1066         if (net_read_ip(&bp->bp_yiaddr).s_addr == 0) {
1067 #if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
1068                 store_bootp_params(bp);
1069 #endif
1070                 return;
1071         }
1072
1073         switch (dhcp_state) {
1074         case SELECTING:
1075                 /*
1076                  * Wait an appropriate time for any potential DHCPOFFER packets
1077                  * to arrive.  Then select one, and generate DHCPREQUEST
1078                  * response.  If filename is in format we recognize, assume it
1079                  * is a valid OFFER from a server we want.
1080                  */
1081                 debug("DHCP: state=SELECTING bp_file: \"%s\"\n", bp->bp_file);
1082 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1083                 if (strncmp(bp->bp_file,
1084                             CONFIG_SYS_BOOTFILE_PREFIX,
1085                             strlen(CONFIG_SYS_BOOTFILE_PREFIX)) == 0) {
1086 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1087                         dhcp_packet_process_options(bp);
1088                         efi_net_set_dhcp_ack(pkt, len);
1089
1090 #if defined(CONFIG_SERVERIP_FROM_PROXYDHCP)
1091                         if (!net_server_ip.s_addr)
1092                                 udelay(CONFIG_SERVERIP_FROM_PROXYDHCP_DELAY_MS *
1093                                         1000);
1094 #endif  /* CONFIG_SERVERIP_FROM_PROXYDHCP */
1095
1096                         debug("TRANSITIONING TO REQUESTING STATE\n");
1097                         dhcp_state = REQUESTING;
1098
1099                         net_set_timeout_handler(5000, bootp_timeout_handler);
1100                         dhcp_send_request_packet(bp);
1101 #ifdef CONFIG_SYS_BOOTFILE_PREFIX
1102                 }
1103 #endif  /* CONFIG_SYS_BOOTFILE_PREFIX */
1104
1105                 return;
1106                 break;
1107         case REQUESTING:
1108                 debug("DHCP State: REQUESTING\n");
1109
1110                 if (dhcp_message_type((u8 *)bp->bp_vend) == DHCP_ACK) {
1111                         dhcp_packet_process_options(bp);
1112                         /* Store net params from reply */
1113                         store_net_params(bp);
1114                         dhcp_state = BOUND;
1115                         printf("DHCP client bound to address %pI4 (%lu ms)\n",
1116                                &net_ip, get_timer(bootp_start));
1117                         net_set_timeout_handler(0, (thand_f *)0);
1118                         bootstage_mark_name(BOOTSTAGE_ID_BOOTP_STOP,
1119                                             "bootp_stop");
1120
1121                         net_auto_load();
1122                         return;
1123                 }
1124                 break;
1125         case BOUND:
1126                 /* DHCP client bound to address */
1127                 break;
1128         default:
1129                 puts("DHCP: INVALID STATE\n");
1130                 break;
1131         }
1132 }
1133
1134 void dhcp_request(void)
1135 {
1136         bootp_request();
1137 }
1138 #endif  /* CONFIG_CMD_DHCP */