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 TftpServerIP;
  62 /* The UDP port at their end */
  63 static int      TftpServerPort;
  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_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 = 0, MasterClient = 0;
 129 static uchar Multicast = 0;
 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) eth_mcast_join(Mcast_addr, 0);
 140         if (Bitmap) free(Bitmap);
 141         Bitmap = NULL;
 142         Mcast_addr = Multicast = Mcast_port = 0;
 143         TftpEndingBlock = -1;
 144 }
 145
 146 #endif  /* CONFIG_MCAST_TFTP */
 147
 148 static __inline__ void
 149 store_block(unsigned block, uchar *src, unsigned len)
 150 {
 151         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 152         ulong newsize = offset + len;
 153 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 154         int i, rc = 0;
 155
 156         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 157                 /* start address in flash? */
 158                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 159                         continue;
 160                 if (load_addr + offset >= flash_info[i].start[0]) {
 161                         rc = 1;
 162                         break;
 163                 }
 164         }
 165
 166         if (rc) { /* Flash is destination for this packet */
 167                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 168                 if (rc) {
 169                         flash_perror(rc);
 170                         NetState = NETLOOP_FAIL;
 171                         return;
 172                 }
 173         }
 174         else
 175 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 176         {
 177                 (void)memcpy((void *)(load_addr + offset), src, len);
 178         }
 179 #ifdef CONFIG_MCAST_TFTP
 180         if (Multicast)
 181                 ext2_set_bit(block, Bitmap);
 182 #endif
 183
 184         if (NetBootFileXferSize < newsize)
 185                 NetBootFileXferSize = newsize;
 186 }
 187
 188 static void TftpSend(void);
 189 static void TftpTimeout(void);
 190
 191 /**********************************************************************/
 192
 193 static void
 194 TftpSend(void)
 195 {
 196         volatile uchar *pkt;
 197         volatile uchar *xp;
 198         int             len = 0;
 199         volatile ushort *s;
 200
 201 #ifdef CONFIG_MCAST_TFTP
 202         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 203         if (Multicast
 204          && (TftpState == STATE_DATA)
 205          && (MasterClient == 0))
 206                 return;
 207 #endif
 208         /*
 209          *      We will always be sending some sort of packet, so
 210          *      cobble together the packet headers now.
 211          */
 212         pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
 213
 214         switch (TftpState) {
 215
 216         case STATE_RRQ:
 217                 xp = pkt;
 218                 s = (ushort *)pkt;
 219                 *s++ = htons(TFTP_RRQ);
 220                 pkt = (uchar *)s;
 221                 strcpy((char *)pkt, tftp_filename);
 222                 pkt += strlen(tftp_filename) + 1;
 223                 strcpy((char *)pkt, "octet");
 224                 pkt += 5 /*strlen("octet")*/ + 1;
 225                 strcpy((char *)pkt, "timeout");
 226                 pkt += 7 /*strlen("timeout")*/ + 1;
 227                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 228                 debug("send option \"timeout %s\"\n", (char *)pkt);
 229                 pkt += strlen((char *)pkt) + 1;
 230 #ifdef CONFIG_TFTP_TSIZE
 231                 memcpy((char *)pkt, "tsize\0000\0", 8);
 232                 pkt += 8;
 233 #endif
 234                 /* try for more effic. blk size */
 235                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 236                                 0, TftpBlkSizeOption, 0);
 237 #ifdef CONFIG_MCAST_TFTP
 238                 /* Check all preconditions before even trying the option */
 239                 if (!ProhibitMcast
 240                  && (Bitmap = malloc(Mapsize))
 241                  && eth_get_dev()->mcast) {
 242                         free(Bitmap);
 243                         Bitmap = NULL;
 244                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 245                 }
 246 #endif /* CONFIG_MCAST_TFTP */
 247                 len = pkt - xp;
 248                 break;
 249
 250         case STATE_OACK:
 251 #ifdef CONFIG_MCAST_TFTP
 252                 /* My turn!  Start at where I need blocks I missed.*/
 253                 if (Multicast)
 254                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 255                                                             (Mapsize*8), 0);
 256                 /*..falling..*/
 257 #endif
 258         case STATE_DATA:
 259                 xp = pkt;
 260                 s = (ushort *)pkt;
 261                 *s++ = htons(TFTP_ACK);
 262                 *s++ = htons(TftpBlock);
 263                 pkt = (uchar *)s;
 264                 len = pkt - xp;
 265                 break;
 266
 267         case STATE_TOO_LARGE:
 268                 xp = pkt;
 269                 s = (ushort *)pkt;
 270                 *s++ = htons(TFTP_ERROR);
 271                 *s++ = htons(3);
 272                 pkt = (uchar *)s;
 273                 strcpy((char *)pkt, "File too large");
 274                 pkt += 14 /*strlen("File too large")*/ + 1;
 275                 len = pkt - xp;
 276                 break;
 277
 278         case STATE_BAD_MAGIC:
 279                 xp = pkt;
 280                 s = (ushort *)pkt;
 281                 *s++ = htons(TFTP_ERROR);
 282                 *s++ = htons(2);
 283                 pkt = (uchar *)s;
 284                 strcpy((char *)pkt, "File has bad magic");
 285                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 286                 len = pkt - xp;
 287                 break;
 288         }
 289
 290         NetSendUDPPacket(NetServerEther, TftpServerIP, TftpServerPort,
 291                          TftpOurPort, len);
 292 }
 293
 294
 295 static void
 296 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 297             unsigned len)
 298 {
 299         ushort proto;
 300         ushort *s;
 301         int i;
 302
 303         if (dest != TftpOurPort) {
 304 #ifdef CONFIG_MCAST_TFTP
 305                 if (Multicast
 306                  && (!Mcast_port || (dest != Mcast_port)))
 307 #endif
 308                 return;
 309         }
 310         if (TftpState != STATE_RRQ && src != TftpServerPort) {
 311                 return;
 312         }
 313
 314         if (len < 2) {
 315                 return;
 316         }
 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                 TftpServerPort = 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
 403                 if (TftpState == STATE_RRQ)
 404                         debug("Server did not acknowledge timeout option!\n");
 405
 406                 if (TftpState == STATE_RRQ || TftpState == STATE_OACK) {
 407                         /* first block received */
 408                         TftpState = STATE_DATA;
 409                         TftpServerPort = src;
 410                         TftpLastBlock = 0;
 411                         TftpBlockWrap = 0;
 412                         TftpBlockWrapOffset = 0;
 413
 414 #ifdef CONFIG_MCAST_TFTP
 415                         if (Multicast) { /* start!=1 common if mcast */
 416                                 TftpLastBlock = TftpBlock - 1;
 417                         } else
 418 #endif
 419                         if (TftpBlock != 1) {   /* Assertion */
 420                                 printf("\nTFTP error: "
 421                                        "First block is not block 1 (%ld)\n"
 422                                        "Starting again\n\n",
 423                                         TftpBlock);
 424                                 NetStartAgain();
 425                                 break;
 426                         }
 427                 }
 428
 429                 if (TftpBlock == TftpLastBlock) {
 430                         /*
 431                          *      Same block again; ignore it.
 432                          */
 433                         break;
 434                 }
 435
 436                 TftpLastBlock = TftpBlock;
 437                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 438                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 439
 440                 store_block(TftpBlock - 1, pkt + 2, len);
 441
 442                 /*
 443                  *      Acknoledge the block just received, which will prompt
 444                  *      the server for the next one.
 445                  */
 446 #ifdef CONFIG_MCAST_TFTP
 447                 /* if I am the MasterClient, actively calculate what my next
 448                  * needed block is; else I'm passive; not ACKING
 449                  */
 450                 if (Multicast) {
 451                         if (len < TftpBlkSize)  {
 452                                 TftpEndingBlock = TftpBlock;
 453                         } else if (MasterClient) {
 454                                 TftpBlock = PrevBitmapHole =
 455                                         ext2_find_next_zero_bit(
 456                                                 Bitmap,
 457                                                 (Mapsize*8),
 458                                                 PrevBitmapHole);
 459                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 460                                         printf("tftpfile too big\n");
 461                                         /* try to double it and retry */
 462                                         Mapsize <<= 1;
 463                                         mcast_cleanup();
 464                                         NetStartAgain();
 465                                         return;
 466                                 }
 467                                 TftpLastBlock = TftpBlock;
 468                         }
 469                 }
 470 #endif
 471                 TftpSend();
 472
 473 #ifdef CONFIG_MCAST_TFTP
 474                 if (Multicast) {
 475                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 476                                 puts("\nMulticast tftp done\n");
 477                                 mcast_cleanup();
 478                                 NetState = NETLOOP_SUCCESS;
 479                         }
 480                 }
 481                 else
 482 #endif
 483                 if (len < TftpBlkSize) {
 484                         /*
 485                          *      We received the whole thing.  Try to
 486                          *      run it.
 487                          */
 488 #ifdef CONFIG_TFTP_TSIZE
 489                         /* Print hash marks for the last packet received */
 490                         while (TftpTsize && TftpNumchars < 49) {
 491                                 putc('#');
 492                                 TftpNumchars++;
 493                         }
 494 #endif
 495                         puts("\ndone\n");
 496                         NetState = NETLOOP_SUCCESS;
 497                 }
 498                 break;
 499
 500         case TFTP_ERROR:
 501                 printf("\nTFTP error: '%s' (%d)\n",
 502                        pkt + 2, ntohs(*(ushort *)pkt));
 503
 504                 switch (ntohs(*(ushort *)pkt)) {
 505                 case TFTP_ERR_FILE_NOT_FOUND:
 506                 case TFTP_ERR_ACCESS_DENIED:
 507                         puts("Not retrying...\n");
 508                         eth_halt();
 509                         NetState = NETLOOP_FAIL;
 510                         break;
 511                 case TFTP_ERR_UNDEFINED:
 512                 case TFTP_ERR_DISK_FULL:
 513                 case TFTP_ERR_UNEXPECTED_OPCODE:
 514                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 515                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 516                 default:
 517                         puts("Starting again\n\n");
 518 #ifdef CONFIG_MCAST_TFTP
 519                         mcast_cleanup();
 520 #endif
 521                         NetStartAgain();
 522                         break;
 523                 }
 524                 break;
 525         }
 526 }
 527
 528
 529 static void
 530 TftpTimeout(void)
 531 {
 532         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 533                 puts("\nRetry count exceeded; starting again\n");
 534 #ifdef CONFIG_MCAST_TFTP
 535                 mcast_cleanup();
 536 #endif
 537                 NetStartAgain();
 538         } else {
 539                 puts("T ");
 540                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 541                 TftpSend();
 542         }
 543 }
 544
 545
 546 void
 547 TftpStart(void)
 548 {
 549         char *ep;             /* Environment pointer */
 550
 551         /*
 552          * Allow the user to choose TFTP blocksize and timeout.
 553          * TFTP protocol has a minimal timeout of 1 second.
 554          */
 555         if ((ep = getenv("tftpblocksize")) != NULL)
 556                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 557
 558         if ((ep = getenv("tftptimeout")) != NULL)
 559                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 560
 561         if (TftpTimeoutMSecs < 1000) {
 562                 printf("TFTP timeout (%ld ms) too low, "
 563                         "set minimum = 1000 ms\n",
 564                         TftpTimeoutMSecs);
 565                 TftpTimeoutMSecs = 1000;
 566         }
 567
 568         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 569                 TftpBlkSizeOption, TftpTimeoutMSecs);
 570
 571         TftpServerIP = NetServerIP;
 572         if (BootFile[0] == '\0') {
 573                 sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
 574                         NetOurIP & 0xFF,
 575                         (NetOurIP >>  8) & 0xFF,
 576                         (NetOurIP >> 16) & 0xFF,
 577                         (NetOurIP >> 24) & 0xFF);
 578
 579                 strncpy(tftp_filename, default_filename, MAX_LEN);
 580                 tftp_filename[MAX_LEN-1] = 0;
 581
 582                 printf("*** Warning: no boot file name; using '%s'\n",
 583                         tftp_filename);
 584         } else {
 585                 char *p = strchr(BootFile, ':');
 586
 587                 if (p == NULL) {
 588                         strncpy(tftp_filename, BootFile, MAX_LEN);
 589                         tftp_filename[MAX_LEN-1] = 0;
 590                 } else {
 591                         TftpServerIP = string_to_ip(BootFile);
 592                         strncpy(tftp_filename, p + 1, MAX_LEN);
 593                         tftp_filename[MAX_LEN-1] = 0;
 594                 }
 595         }
 596
 597 #if defined(CONFIG_NET_MULTI)
 598         printf("Using %s device\n", eth_get_name());
 599 #endif
 600         printf("TFTP from server %pI4"
 601                 "; our IP address is %pI4", &TftpServerIP, &NetOurIP);
 602
 603         /* Check if we need to send across this subnet */
 604         if (NetOurGatewayIP && NetOurSubnetMask) {
 605             IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
 606             IPaddr_t ServerNet  = TftpServerIP & NetOurSubnetMask;
 607
 608             if (OurNet != ServerNet)
 609                 printf("; sending through gateway %pI4", &NetOurGatewayIP);
 610         }
 611         putc('\n');
 612
 613         printf("Filename '%s'.", tftp_filename);
 614
 615         if (NetBootFileSize) {
 616                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 617                 print_size(NetBootFileSize<<9, "");
 618         }
 619
 620         putc('\n');
 621
 622         printf("Load address: 0x%lx\n", load_addr);
 623
 624         puts("Loading: *\b");
 625
 626         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 627
 628         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 629         NetSetHandler(TftpHandler);
 630
 631         TftpServerPort = WELL_KNOWN_PORT;
 632         TftpTimeoutCount = 0;
 633         TftpState = STATE_RRQ;
 634         /* Use a pseudo-random port unless a specific port is set */
 635         TftpOurPort = 1024 + (get_timer(0) % 3072);
 636
 637 #ifdef CONFIG_TFTP_PORT
 638         if ((ep = getenv("tftpdstp")) != NULL) {
 639                 TftpServerPort = simple_strtol(ep, NULL, 10);
 640         }
 641         if ((ep = getenv("tftpsrcp")) != NULL) {
 642                 TftpOurPort = simple_strtol(ep, NULL, 10);
 643         }
 644 #endif
 645         TftpBlock = 0;
 646
 647         /* zero out server ether in case the server ip has changed */
 648         memset(NetServerEther, 0, 6);
 649         /* Revert TftpBlkSize to dflt */
 650         TftpBlkSize = TFTP_BLOCK_SIZE;
 651 #ifdef CONFIG_MCAST_TFTP
 652         mcast_cleanup();
 653 #endif
 654 #ifdef CONFIG_TFTP_TSIZE
 655         TftpTsize = 0;
 656         TftpNumchars = 0;
 657 #endif
 658
 659         TftpSend();
 660 }
 661
 662 #ifdef CONFIG_MCAST_TFTP
 663 /* Credits: atftp project.
 664  */
 665
 666 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 667  * Frame:
 668  *    +-------+-----------+---+-------~~-------+---+
 669  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 670  *    +-------+-----------+---+-------~~-------+---+
 671  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 672  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 673  * master-client, I'm a passive client, gathering what DataBlocks I may and
 674  * making note of which ones I got in my bitmask.
 675  * In theory, I never go from master->passive..
 676  * .. this comes in with pkt already pointing just past opc
 677  */
 678 static void parse_multicast_oack(char *pkt, int len)
 679 {
 680         int i;
 681         IPaddr_t addr;
 682         char *mc_adr, *port,  *mc;
 683
 684         mc_adr = port = mc = NULL;
 685         /* march along looking for 'multicast\0', which has to start at least
 686          * 14 bytes back from the end.
 687          */
 688         for (i = 0; i < len-14; i++)
 689                 if (strcmp(pkt+i, "multicast") == 0)
 690                         break;
 691         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 692                 return;
 693
 694         i += 10; /* strlen multicast */
 695         mc_adr = pkt+i;
 696         for (; i < len; i++) {
 697                 if (*(pkt+i) == ',') {
 698                         *(pkt+i) = '\0';
 699                         if (port) {
 700                                 mc = pkt+i+1;
 701                                 break;
 702                         } else {
 703                                 port = pkt+i+1;
 704                         }
 705                 }
 706         }
 707         if (!port || !mc_adr || !mc) return;
 708         if (Multicast && MasterClient) {
 709                 printf("I got a OACK as master Client, WRONG!\n");
 710                 return;
 711         }
 712         /* ..I now accept packets destined for this MCAST addr, port */
 713         if (!Multicast) {
 714                 if (Bitmap) {
 715                         printf("Internal failure! no mcast.\n");
 716                         free(Bitmap);
 717                         Bitmap = NULL;
 718                         ProhibitMcast = 1;
 719                         return ;
 720                 }
 721                 /* I malloc instead of pre-declare; so that if the file ends
 722                  * up being too big for this bitmap I can retry
 723                  */
 724                 if (!(Bitmap = malloc(Mapsize))) {
 725                         printf("No Bitmap, no multicast. Sorry.\n");
 726                         ProhibitMcast = 1;
 727                         return;
 728                 }
 729                 memset(Bitmap, 0, Mapsize);
 730                 PrevBitmapHole = 0;
 731                 Multicast = 1;
 732         }
 733         addr = string_to_ip(mc_adr);
 734         if (Mcast_addr != addr) {
 735                 if (Mcast_addr)
 736                         eth_mcast_join(Mcast_addr, 0);
 737                 if (eth_mcast_join(Mcast_addr = addr, 1)) {
 738                         printf("Fail to set mcast, revert to TFTP\n");
 739                         ProhibitMcast = 1;
 740                         mcast_cleanup();
 741                         NetStartAgain();
 742                 }
 743         }
 744         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 745         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 746         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 747         return;
 748 }
 749
 750 #endif /* Multicast TFTP */