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