net/tftp.c

   1 /*
   2  * Copyright 1994, 1995, 2000 Neil Russell.
   3  * (See License)
   4  * Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
   5  */
   6
   7 #include <common.h>
   8 #include <command.h>
   9 #include <net.h>
  10 #include "tftp.h"
  11 #include "bootp.h"
  12
  13 /* Well known TFTP port # */
  14 #define WELL_KNOWN_PORT 69
  15 /* Millisecs to timeout for lost pkt */
  16 #define TIMEOUT         5000UL
  17 #ifndef CONFIG_NET_RETRY_COUNT
  18 /* # of timeouts before giving up */
  19 # define TIMEOUT_COUNT  10
  20 #else
  21 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  22 #endif
  23 /* Number of "loading" hashes per line (for checking the image size) */
  24 #define HASHES_PER_LINE 65
  25
  26 /*
  27  *      TFTP operations.
  28  */
  29 #define TFTP_RRQ        1
  30 #define TFTP_WRQ        2
  31 #define TFTP_DATA       3
  32 #define TFTP_ACK        4
  33 #define TFTP_ERROR      5
  34 #define TFTP_OACK       6
  35
  36 static ulong TftpTimeoutMSecs = TIMEOUT;
  37 static int TftpTimeoutCountMax = TIMEOUT_COUNT;
  38
  39 /*
  40  * These globals govern the timeout behavior when attempting a connection to a
  41  * TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
  42  * wait for the server to respond to initial connection. Second global,
  43  * TftpRRQTimeoutCountMax, gives the number of such connection retries.
  44  * TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
  45  * positive. The globals are meant to be set (and restored) by code needing
  46  * non-standard timeout behavior when initiating a TFTP transfer.
  47  */
  48 ulong TftpRRQTimeoutMSecs = TIMEOUT;
  49 int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
  50
  51 enum {
  52         TFTP_ERR_UNDEFINED           = 0,
  53         TFTP_ERR_FILE_NOT_FOUND      = 1,
  54         TFTP_ERR_ACCESS_DENIED       = 2,
  55         TFTP_ERR_DISK_FULL           = 3,
  56         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  57         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  58         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  59 };
  60
  61 static IPaddr_t TftpRemoteIP;
  62 /* The UDP port at their end */
  63 static int      TftpRemotePort;
  64 /* The UDP port at our end */
  65 static int      TftpOurPort;
  66 static int      TftpTimeoutCount;
  67 /* packet sequence number */
  68 static ulong    TftpBlock;
  69 /* last packet sequence number received */
  70 static ulong    TftpLastBlock;
  71 /* count of sequence number wraparounds */
  72 static ulong    TftpBlockWrap;
  73 /* memory offset due to wrapping */
  74 static ulong    TftpBlockWrapOffset;
  75 static int      TftpState;
  76 #ifdef CONFIG_TFTP_TSIZE
  77 /* The file size reported by the server */
  78 static int      TftpTsize;
  79 /* The number of hashes we printed */
  80 static short    TftpNumchars;
  81 #endif
  82
  83 #define STATE_SEND_RRQ  1
  84 #define STATE_DATA      2
  85 #define STATE_TOO_LARGE 3
  86 #define STATE_BAD_MAGIC 4
  87 #define STATE_OACK      5
  88
  89 /* default TFTP block size */
  90 #define TFTP_BLOCK_SIZE         512
  91 /* sequence number is 16 bit */
  92 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
  93
  94 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
  95 static char default_filename[DEFAULT_NAME_LEN];
  96
  97 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
  98 #define MAX_LEN 128
  99 #else
 100 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 101 #endif
 102
 103 static char tftp_filename[MAX_LEN];
 104
 105 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 106 extern flash_info_t flash_info[];
 107 #endif
 108
 109 /* 512 is poor choice for ethernet, MTU is typically 1500.
 110  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 111  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 112  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 113  */
 114 #ifdef CONFIG_TFTP_BLOCKSIZE
 115 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 116 #else
 117 #define TFTP_MTU_BLOCKSIZE 1468
 118 #endif
 119
 120 static unsigned short TftpBlkSize = TFTP_BLOCK_SIZE;
 121 static unsigned short TftpBlkSizeOption = TFTP_MTU_BLOCKSIZE;
 122
 123 #ifdef CONFIG_MCAST_TFTP
 124 #include <malloc.h>
 125 #define MTFTP_BITMAPSIZE        0x1000
 126 static unsigned *Bitmap;
 127 static int PrevBitmapHole, Mapsize = MTFTP_BITMAPSIZE;
 128 static uchar ProhibitMcast, MasterClient;
 129 static uchar Multicast;
 130 extern IPaddr_t Mcast_addr;
 131 static int Mcast_port;
 132 static ulong TftpEndingBlock; /* can get 'last' block before done..*/
 133
 134 static void parse_multicast_oack(char *pkt, int len);
 135
 136 static void
 137 mcast_cleanup(void)
 138 {
 139         if (Mcast_addr)
 140                 eth_mcast_join(Mcast_addr, 0);
 141         if (Bitmap)
 142                 free(Bitmap);
 143         Bitmap = NULL;
 144         Mcast_addr = Multicast = Mcast_port = 0;
 145         TftpEndingBlock = -1;
 146 }
 147
 148 #endif  /* CONFIG_MCAST_TFTP */
 149
 150 static __inline__ void
 151 store_block(unsigned block, uchar *src, unsigned len)
 152 {
 153         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 154         ulong newsize = offset + len;
 155 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 156         int i, rc = 0;
 157
 158         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 159                 /* start address in flash? */
 160                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 161                         continue;
 162                 if (load_addr + offset >= flash_info[i].start[0]) {
 163                         rc = 1;
 164                         break;
 165                 }
 166         }
 167
 168         if (rc) { /* Flash is destination for this packet */
 169                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 170                 if (rc) {
 171                         flash_perror(rc);
 172                         NetState = NETLOOP_FAIL;
 173                         return;
 174                 }
 175         }
 176         else
 177 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 178         {
 179                 (void)memcpy((void *)(load_addr + offset), src, len);
 180         }
 181 #ifdef CONFIG_MCAST_TFTP
 182         if (Multicast)
 183                 ext2_set_bit(block, Bitmap);
 184 #endif
 185
 186         if (NetBootFileXferSize < newsize)
 187                 NetBootFileXferSize = newsize;
 188 }
 189
 190 static void TftpSend(void);
 191 static void TftpTimeout(void);
 192
 193 /**********************************************************************/
 194
 195 static void
 196 TftpSend(void)
 197 {
 198         volatile uchar *pkt;
 199         volatile uchar *xp;
 200         int             len = 0;
 201         volatile ushort *s;
 202
 203 #ifdef CONFIG_MCAST_TFTP
 204         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 205         if (Multicast
 206          && (TftpState == STATE_DATA)
 207          && (MasterClient == 0))
 208                 return;
 209 #endif
 210         /*
 211          *      We will always be sending some sort of packet, so
 212          *      cobble together the packet headers now.
 213          */
 214         pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
 215
 216         switch (TftpState) {
 217
 218         case STATE_SEND_RRQ:
 219                 xp = pkt;
 220                 s = (ushort *)pkt;
 221                 *s++ = htons(TFTP_RRQ);
 222                 pkt = (uchar *)s;
 223                 strcpy((char *)pkt, tftp_filename);
 224                 pkt += strlen(tftp_filename) + 1;
 225                 strcpy((char *)pkt, "octet");
 226                 pkt += 5 /*strlen("octet")*/ + 1;
 227                 strcpy((char *)pkt, "timeout");
 228                 pkt += 7 /*strlen("timeout")*/ + 1;
 229                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 230                 debug("send option \"timeout %s\"\n", (char *)pkt);
 231                 pkt += strlen((char *)pkt) + 1;
 232 #ifdef CONFIG_TFTP_TSIZE
 233                 memcpy((char *)pkt, "tsize\0000\0", 8);
 234                 pkt += 8;
 235 #endif
 236                 /* try for more effic. blk size */
 237                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 238                                 0, TftpBlkSizeOption, 0);
 239 #ifdef CONFIG_MCAST_TFTP
 240                 /* Check all preconditions before even trying the option */
 241                 if (!ProhibitMcast
 242                  && (Bitmap = malloc(Mapsize))
 243                  && eth_get_dev()->mcast) {
 244                         free(Bitmap);
 245                         Bitmap = NULL;
 246                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 247                 }
 248 #endif /* CONFIG_MCAST_TFTP */
 249                 len = pkt - xp;
 250                 break;
 251
 252         case STATE_OACK:
 253 #ifdef CONFIG_MCAST_TFTP
 254                 /* My turn!  Start at where I need blocks I missed.*/
 255                 if (Multicast)
 256                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 257                                                             (Mapsize*8), 0);
 258                 /*..falling..*/
 259 #endif
 260         case STATE_DATA:
 261                 xp = pkt;
 262                 s = (ushort *)pkt;
 263                 *s++ = htons(TFTP_ACK);
 264                 *s++ = htons(TftpBlock);
 265                 pkt = (uchar *)s;
 266                 len = pkt - xp;
 267                 break;
 268
 269         case STATE_TOO_LARGE:
 270                 xp = pkt;
 271                 s = (ushort *)pkt;
 272                 *s++ = htons(TFTP_ERROR);
 273                 *s++ = htons(3);
 274                 pkt = (uchar *)s;
 275                 strcpy((char *)pkt, "File too large");
 276                 pkt += 14 /*strlen("File too large")*/ + 1;
 277                 len = pkt - xp;
 278                 break;
 279
 280         case STATE_BAD_MAGIC:
 281                 xp = pkt;
 282                 s = (ushort *)pkt;
 283                 *s++ = htons(TFTP_ERROR);
 284                 *s++ = htons(2);
 285                 pkt = (uchar *)s;
 286                 strcpy((char *)pkt, "File has bad magic");
 287                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 288                 len = pkt - xp;
 289                 break;
 290         }
 291
 292         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 293                          TftpOurPort, len);
 294 }
 295
 296
 297 static void
 298 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 299             unsigned len)
 300 {
 301         ushort proto;
 302         ushort *s;
 303         int i;
 304
 305         if (dest != TftpOurPort) {
 306 #ifdef CONFIG_MCAST_TFTP
 307                 if (Multicast
 308                  && (!Mcast_port || (dest != Mcast_port)))
 309 #endif
 310                         return;
 311         }
 312         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort)
 313                 return;
 314
 315         if (len < 2)
 316                 return;
 317         len -= 2;
 318         /* warning: don't use increment (++) in ntohs() macros!! */
 319         s = (ushort *)pkt;
 320         proto = *s++;
 321         pkt = (uchar *)s;
 322         switch (ntohs(proto)) {
 323
 324         case TFTP_RRQ:
 325         case TFTP_WRQ:
 326         case TFTP_ACK:
 327                 break;
 328         default:
 329                 break;
 330
 331         case TFTP_OACK:
 332                 debug("Got OACK: %s %s\n",
 333                         pkt,
 334                         pkt + strlen((char *)pkt) + 1);
 335                 TftpState = STATE_OACK;
 336                 TftpRemotePort = src;
 337                 /*
 338                  * Check for 'blksize' option.
 339                  * Careful: "i" is signed, "len" is unsigned, thus
 340                  * something like "len-8" may give a *huge* number
 341                  */
 342                 for (i = 0; i+8 < len; i++) {
 343                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 344                                 TftpBlkSize = (unsigned short)
 345                                         simple_strtoul((char *)pkt+i+8, NULL,
 346                                                        10);
 347                                 debug("Blocksize ack: %s, %d\n",
 348                                         (char *)pkt+i+8, TftpBlkSize);
 349                         }
 350 #ifdef CONFIG_TFTP_TSIZE
 351                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 352                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 353                                                            NULL, 10);
 354                                 debug("size = %s, %d\n",
 355                                          (char *)pkt+i+6, TftpTsize);
 356                         }
 357 #endif
 358                 }
 359 #ifdef CONFIG_MCAST_TFTP
 360                 parse_multicast_oack((char *)pkt, len-1);
 361                 if ((Multicast) && (!MasterClient))
 362                         TftpState = STATE_DATA; /* passive.. */
 363                 else
 364 #endif
 365                 TftpSend(); /* Send ACK */
 366                 break;
 367         case TFTP_DATA:
 368                 if (len < 2)
 369                         return;
 370                 len -= 2;
 371                 TftpBlock = ntohs(*(ushort *)pkt);
 372
 373                 /*
 374                  * RFC1350 specifies that the first data packet will
 375                  * have sequence number 1. If we receive a sequence
 376                  * number of 0 this means that there was a wrap
 377                  * around of the (16 bit) counter.
 378                  */
 379                 if (TftpBlock == 0) {
 380                         TftpBlockWrap++;
 381                         TftpBlockWrapOffset +=
 382                                 TftpBlkSize * TFTP_SEQUENCE_SIZE;
 383                         printf("\n\t %lu MB received\n\t ",
 384                                 TftpBlockWrapOffset>>20);
 385                 }
 386 #ifdef CONFIG_TFTP_TSIZE
 387                 else if (TftpTsize) {
 388                         while (TftpNumchars <
 389                                NetBootFileXferSize * 50 / TftpTsize) {
 390                                 putc('#');
 391                                 TftpNumchars++;
 392                         }
 393                 }
 394 #endif
 395                 else {
 396                         if (((TftpBlock - 1) % 10) == 0)
 397                                 putc('#');
 398                         else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 399                                 puts("\n\t ");
 400                 }
 401
 402                 if (TftpState == STATE_SEND_RRQ)
 403                         debug("Server did not acknowledge timeout option!\n");
 404
 405                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK) {
 406                         /* first block received */
 407                         TftpState = STATE_DATA;
 408                         TftpRemotePort = src;
 409                         TftpLastBlock = 0;
 410                         TftpBlockWrap = 0;
 411                         TftpBlockWrapOffset = 0;
 412
 413 #ifdef CONFIG_MCAST_TFTP
 414                         if (Multicast) { /* start!=1 common if mcast */
 415                                 TftpLastBlock = TftpBlock - 1;
 416                         } else
 417 #endif
 418                         if (TftpBlock != 1) {   /* Assertion */
 419                                 printf("\nTFTP error: "
 420                                        "First block is not block 1 (%ld)\n"
 421                                        "Starting again\n\n",
 422                                         TftpBlock);
 423                                 NetStartAgain();
 424                                 break;
 425                         }
 426                 }
 427
 428                 if (TftpBlock == TftpLastBlock) {
 429                         /*
 430                          *      Same block again; ignore it.
 431                          */
 432                         break;
 433                 }
 434
 435                 TftpLastBlock = TftpBlock;
 436                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 437                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 438
 439                 store_block(TftpBlock - 1, pkt + 2, len);
 440
 441                 /*
 442                  *      Acknoledge the block just received, which will prompt
 443                  *      the remote for the next one.
 444                  */
 445 #ifdef CONFIG_MCAST_TFTP
 446                 /* if I am the MasterClient, actively calculate what my next
 447                  * needed block is; else I'm passive; not ACKING
 448                  */
 449                 if (Multicast) {
 450                         if (len < TftpBlkSize)  {
 451                                 TftpEndingBlock = TftpBlock;
 452                         } else if (MasterClient) {
 453                                 TftpBlock = PrevBitmapHole =
 454                                         ext2_find_next_zero_bit(
 455                                                 Bitmap,
 456                                                 (Mapsize*8),
 457                                                 PrevBitmapHole);
 458                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 459                                         printf("tftpfile too big\n");
 460                                         /* try to double it and retry */
 461                                         Mapsize <<= 1;
 462                                         mcast_cleanup();
 463                                         NetStartAgain();
 464                                         return;
 465                                 }
 466                                 TftpLastBlock = TftpBlock;
 467                         }
 468                 }
 469 #endif
 470                 TftpSend();
 471
 472 #ifdef CONFIG_MCAST_TFTP
 473                 if (Multicast) {
 474                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 475                                 puts("\nMulticast tftp done\n");
 476                                 mcast_cleanup();
 477                                 NetState = NETLOOP_SUCCESS;
 478                         }
 479                 }
 480                 else
 481 #endif
 482                 if (len < TftpBlkSize) {
 483                         /*
 484                          *      We received the whole thing.  Try to
 485                          *      run it.
 486                          */
 487 #ifdef CONFIG_TFTP_TSIZE
 488                         /* Print hash marks for the last packet received */
 489                         while (TftpTsize && TftpNumchars < 49) {
 490                                 putc('#');
 491                                 TftpNumchars++;
 492                         }
 493 #endif
 494                         puts("\ndone\n");
 495                         NetState = NETLOOP_SUCCESS;
 496                 }
 497                 break;
 498
 499         case TFTP_ERROR:
 500                 printf("\nTFTP error: '%s' (%d)\n",
 501                        pkt + 2, ntohs(*(ushort *)pkt));
 502
 503                 switch (ntohs(*(ushort *)pkt)) {
 504                 case TFTP_ERR_FILE_NOT_FOUND:
 505                 case TFTP_ERR_ACCESS_DENIED:
 506                         puts("Not retrying...\n");
 507                         eth_halt();
 508                         NetState = NETLOOP_FAIL;
 509                         break;
 510                 case TFTP_ERR_UNDEFINED:
 511                 case TFTP_ERR_DISK_FULL:
 512                 case TFTP_ERR_UNEXPECTED_OPCODE:
 513                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 514                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 515                 default:
 516                         puts("Starting again\n\n");
 517 #ifdef CONFIG_MCAST_TFTP
 518                         mcast_cleanup();
 519 #endif
 520                         NetStartAgain();
 521                         break;
 522                 }
 523                 break;
 524         }
 525 }
 526
 527
 528 static void
 529 TftpTimeout(void)
 530 {
 531         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 532                 puts("\nRetry count exceeded; starting again\n");
 533 #ifdef CONFIG_MCAST_TFTP
 534                 mcast_cleanup();
 535 #endif
 536                 NetStartAgain();
 537         } else {
 538                 puts("T ");
 539                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 540                 TftpSend();
 541         }
 542 }
 543
 544
 545 void
 546 TftpStart(void)
 547 {
 548         char *ep;             /* Environment pointer */
 549
 550         /*
 551          * Allow the user to choose TFTP blocksize and timeout.
 552          * TFTP protocol has a minimal timeout of 1 second.
 553          */
 554         ep = getenv("tftpblocksize");
 555         if (ep != NULL)
 556                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 557
 558         ep = getenv("tftptimeout");
 559         if (ep != NULL)
 560                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 561
 562         if (TftpTimeoutMSecs < 1000) {
 563                 printf("TFTP timeout (%ld ms) too low, "
 564                         "set minimum = 1000 ms\n",
 565                         TftpTimeoutMSecs);
 566                 TftpTimeoutMSecs = 1000;
 567         }
 568
 569         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 570                 TftpBlkSizeOption, TftpTimeoutMSecs);
 571
 572         TftpRemoteIP = NetServerIP;
 573         if (BootFile[0] == '\0') {
 574                 sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
 575                         NetOurIP & 0xFF,
 576                         (NetOurIP >>  8) & 0xFF,
 577                         (NetOurIP >> 16) & 0xFF,
 578                         (NetOurIP >> 24) & 0xFF);
 579
 580                 strncpy(tftp_filename, default_filename, MAX_LEN);
 581                 tftp_filename[MAX_LEN-1] = 0;
 582
 583                 printf("*** Warning: no boot file name; using '%s'\n",
 584                         tftp_filename);
 585         } else {
 586                 char *p = strchr(BootFile, ':');
 587
 588                 if (p == NULL) {
 589                         strncpy(tftp_filename, BootFile, MAX_LEN);
 590                         tftp_filename[MAX_LEN-1] = 0;
 591                 } else {
 592                         TftpRemoteIP = string_to_ip(BootFile);
 593                         strncpy(tftp_filename, p + 1, MAX_LEN);
 594                         tftp_filename[MAX_LEN-1] = 0;
 595                 }
 596         }
 597
 598 #if defined(CONFIG_NET_MULTI)
 599         printf("Using %s device\n", eth_get_name());
 600 #endif
 601         printf("TFTP from server %pI4"
 602                 "; our IP address is %pI4", &TftpRemoteIP, &NetOurIP);
 603
 604         /* Check if we need to send across this subnet */
 605         if (NetOurGatewayIP && NetOurSubnetMask) {
 606                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 607                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 608
 609                 if (OurNet != RemoteNet)
 610                         printf("; sending through gateway %pI4",
 611                                &NetOurGatewayIP);
 612         }
 613         putc('\n');
 614
 615         printf("Filename '%s'.", tftp_filename);
 616
 617         if (NetBootFileSize) {
 618                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 619                 print_size(NetBootFileSize<<9, "");
 620         }
 621
 622         putc('\n');
 623
 624         printf("Load address: 0x%lx\n", load_addr);
 625
 626         puts("Loading: *\b");
 627
 628         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 629
 630         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 631         NetSetHandler(TftpHandler);
 632
 633         TftpRemotePort = WELL_KNOWN_PORT;
 634         TftpTimeoutCount = 0;
 635         TftpState = STATE_SEND_RRQ;
 636         /* Use a pseudo-random port unless a specific port is set */
 637         TftpOurPort = 1024 + (get_timer(0) % 3072);
 638
 639 #ifdef CONFIG_TFTP_PORT
 640         ep = getenv("tftpdstp");
 641         if (ep != NULL)
 642                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 643         ep = getenv("tftpsrcp");
 644         if (ep != NULL)
 645                 TftpOurPort = simple_strtol(ep, NULL, 10);
 646 #endif
 647         TftpBlock = 0;
 648
 649         /* zero out server ether in case the server ip has changed */
 650         memset(NetServerEther, 0, 6);
 651         /* Revert TftpBlkSize to dflt */
 652         TftpBlkSize = TFTP_BLOCK_SIZE;
 653 #ifdef CONFIG_MCAST_TFTP
 654         mcast_cleanup();
 655 #endif
 656 #ifdef CONFIG_TFTP_TSIZE
 657         TftpTsize = 0;
 658         TftpNumchars = 0;
 659 #endif
 660
 661         TftpSend();
 662 }
 663
 664 #ifdef CONFIG_MCAST_TFTP
 665 /* Credits: atftp project.
 666  */
 667
 668 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 669  * Frame:
 670  *    +-------+-----------+---+-------~~-------+---+
 671  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 672  *    +-------+-----------+---+-------~~-------+---+
 673  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 674  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 675  * master-client, I'm a passive client, gathering what DataBlocks I may and
 676  * making note of which ones I got in my bitmask.
 677  * In theory, I never go from master->passive..
 678  * .. this comes in with pkt already pointing just past opc
 679  */
 680 static void parse_multicast_oack(char *pkt, int len)
 681 {
 682         int i;
 683         IPaddr_t addr;
 684         char *mc_adr, *port,  *mc;
 685
 686         mc_adr = port = mc = NULL;
 687         /* march along looking for 'multicast\0', which has to start at least
 688          * 14 bytes back from the end.
 689          */
 690         for (i = 0; i < len-14; i++)
 691                 if (strcmp(pkt+i, "multicast") == 0)
 692                         break;
 693         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 694                 return;
 695
 696         i += 10; /* strlen multicast */
 697         mc_adr = pkt+i;
 698         for (; i < len; i++) {
 699                 if (*(pkt+i) == ',') {
 700                         *(pkt+i) = '\0';
 701                         if (port) {
 702                                 mc = pkt+i+1;
 703                                 break;
 704                         } else {
 705                                 port = pkt+i+1;
 706                         }
 707                 }
 708         }
 709         if (!port || !mc_adr || !mc)
 710                 return;
 711         if (Multicast && MasterClient) {
 712                 printf("I got a OACK as master Client, WRONG!\n");
 713                 return;
 714         }
 715         /* ..I now accept packets destined for this MCAST addr, port */
 716         if (!Multicast) {
 717                 if (Bitmap) {
 718                         printf("Internal failure! no mcast.\n");
 719                         free(Bitmap);
 720                         Bitmap = NULL;
 721                         ProhibitMcast = 1;
 722                         return ;
 723                 }
 724                 /* I malloc instead of pre-declare; so that if the file ends
 725                  * up being too big for this bitmap I can retry
 726                  */
 727                 Bitmap = malloc(Mapsize);
 728                 if (!Bitmap) {
 729                         printf("No Bitmap, no multicast. Sorry.\n");
 730                         ProhibitMcast = 1;
 731                         return;
 732                 }
 733                 memset(Bitmap, 0, Mapsize);
 734                 PrevBitmapHole = 0;
 735                 Multicast = 1;
 736         }
 737         addr = string_to_ip(mc_adr);
 738         if (Mcast_addr != addr) {
 739                 if (Mcast_addr)
 740                         eth_mcast_join(Mcast_addr, 0);
 741                 Mcast_addr = addr;
 742                 if (eth_mcast_join(Mcast_addr, 1)) {
 743                         printf("Fail to set mcast, revert to TFTP\n");
 744                         ProhibitMcast = 1;
 745                         mcast_cleanup();
 746                         NetStartAgain();
 747                 }
 748         }
 749         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 750         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 751         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 752         return;
 753 }
 754
 755 #endif /* Multicast TFTP */