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  * Copyright 2011 Comelit Group SpA,
   6  *                Luca Ceresoli <luca.ceresoli@comelit.it>
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <net.h>
  12 #include "tftp.h"
  13 #include "bootp.h"
  14
  15 /* Well known TFTP port # */
  16 #define WELL_KNOWN_PORT 69
  17 /* Millisecs to timeout for lost pkt */
  18 #define TIMEOUT         5000UL
  19 #ifndef CONFIG_NET_RETRY_COUNT
  20 /* # of timeouts before giving up */
  21 # define TIMEOUT_COUNT  10
  22 #else
  23 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  24 #endif
  25 /* Number of "loading" hashes per line (for checking the image size) */
  26 #define HASHES_PER_LINE 65
  27
  28 /*
  29  *      TFTP operations.
  30  */
  31 #define TFTP_RRQ        1
  32 #define TFTP_WRQ        2
  33 #define TFTP_DATA       3
  34 #define TFTP_ACK        4
  35 #define TFTP_ERROR      5
  36 #define TFTP_OACK       6
  37
  38 static ulong TftpTimeoutMSecs = TIMEOUT;
  39 static int TftpTimeoutCountMax = TIMEOUT_COUNT;
  40
  41 /*
  42  * These globals govern the timeout behavior when attempting a connection to a
  43  * TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
  44  * wait for the server to respond to initial connection. Second global,
  45  * TftpRRQTimeoutCountMax, gives the number of such connection retries.
  46  * TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
  47  * positive. The globals are meant to be set (and restored) by code needing
  48  * non-standard timeout behavior when initiating a TFTP transfer.
  49  */
  50 ulong TftpRRQTimeoutMSecs = TIMEOUT;
  51 int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
  52
  53 enum {
  54         TFTP_ERR_UNDEFINED           = 0,
  55         TFTP_ERR_FILE_NOT_FOUND      = 1,
  56         TFTP_ERR_ACCESS_DENIED       = 2,
  57         TFTP_ERR_DISK_FULL           = 3,
  58         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  59         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  60         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  61 };
  62
  63 static IPaddr_t TftpRemoteIP;
  64 /* The UDP port at their end */
  65 static int      TftpRemotePort;
  66 /* The UDP port at our end */
  67 static int      TftpOurPort;
  68 static int      TftpTimeoutCount;
  69 /* packet sequence number */
  70 static ulong    TftpBlock;
  71 /* last packet sequence number received */
  72 static ulong    TftpLastBlock;
  73 /* count of sequence number wraparounds */
  74 static ulong    TftpBlockWrap;
  75 /* memory offset due to wrapping */
  76 static ulong    TftpBlockWrapOffset;
  77 static int      TftpState;
  78 #ifdef CONFIG_TFTP_TSIZE
  79 /* The file size reported by the server */
  80 static int      TftpTsize;
  81 /* The number of hashes we printed */
  82 static short    TftpNumchars;
  83 #endif
  84
  85 #define STATE_SEND_RRQ  1
  86 #define STATE_DATA      2
  87 #define STATE_TOO_LARGE 3
  88 #define STATE_BAD_MAGIC 4
  89 #define STATE_OACK      5
  90 #define STATE_RECV_WRQ  6
  91
  92 /* default TFTP block size */
  93 #define TFTP_BLOCK_SIZE         512
  94 /* sequence number is 16 bit */
  95 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
  96
  97 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
  98 static char default_filename[DEFAULT_NAME_LEN];
  99
 100 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 101 #define MAX_LEN 128
 102 #else
 103 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 104 #endif
 105
 106 static char tftp_filename[MAX_LEN];
 107
 108 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 109 extern flash_info_t flash_info[];
 110 #endif
 111
 112 /* 512 is poor choice for ethernet, MTU is typically 1500.
 113  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 114  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 115  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 116  */
 117 #ifdef CONFIG_TFTP_BLOCKSIZE
 118 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 119 #else
 120 #define TFTP_MTU_BLOCKSIZE 1468
 121 #endif
 122
 123 static unsigned short TftpBlkSize = TFTP_BLOCK_SIZE;
 124 static unsigned short TftpBlkSizeOption = TFTP_MTU_BLOCKSIZE;
 125
 126 #ifdef CONFIG_MCAST_TFTP
 127 #include <malloc.h>
 128 #define MTFTP_BITMAPSIZE        0x1000
 129 static unsigned *Bitmap;
 130 static int PrevBitmapHole, Mapsize = MTFTP_BITMAPSIZE;
 131 static uchar ProhibitMcast, MasterClient;
 132 static uchar Multicast;
 133 extern IPaddr_t Mcast_addr;
 134 static int Mcast_port;
 135 static ulong TftpEndingBlock; /* can get 'last' block before done..*/
 136
 137 static void parse_multicast_oack(char *pkt, int len);
 138
 139 static void
 140 mcast_cleanup(void)
 141 {
 142         if (Mcast_addr)
 143                 eth_mcast_join(Mcast_addr, 0);
 144         if (Bitmap)
 145                 free(Bitmap);
 146         Bitmap = NULL;
 147         Mcast_addr = Multicast = Mcast_port = 0;
 148         TftpEndingBlock = -1;
 149 }
 150
 151 #endif  /* CONFIG_MCAST_TFTP */
 152
 153 static __inline__ void
 154 store_block(unsigned block, uchar *src, unsigned len)
 155 {
 156         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 157         ulong newsize = offset + len;
 158 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 159         int i, rc = 0;
 160
 161         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 162                 /* start address in flash? */
 163                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 164                         continue;
 165                 if (load_addr + offset >= flash_info[i].start[0]) {
 166                         rc = 1;
 167                         break;
 168                 }
 169         }
 170
 171         if (rc) { /* Flash is destination for this packet */
 172                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 173                 if (rc) {
 174                         flash_perror(rc);
 175                         NetState = NETLOOP_FAIL;
 176                         return;
 177                 }
 178         }
 179         else
 180 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 181         {
 182                 (void)memcpy((void *)(load_addr + offset), src, len);
 183         }
 184 #ifdef CONFIG_MCAST_TFTP
 185         if (Multicast)
 186                 ext2_set_bit(block, Bitmap);
 187 #endif
 188
 189         if (NetBootFileXferSize < newsize)
 190                 NetBootFileXferSize = newsize;
 191 }
 192
 193 static void TftpSend(void);
 194 static void TftpTimeout(void);
 195
 196 /**********************************************************************/
 197
 198 static void show_block_marker(void)
 199 {
 200 #ifdef CONFIG_TFTP_TSIZE
 201         if (TftpTsize) {
 202                 ulong pos = TftpBlock * TftpBlkSize + TftpBlockWrapOffset;
 203
 204                 while (TftpNumchars < pos * 50 / TftpTsize) {
 205                         putc('#');
 206                         TftpNumchars++;
 207                 }
 208         }
 209 #endif
 210         else {
 211                 if (((TftpBlock - 1) % 10) == 0)
 212                         putc('#');
 213                 else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 214                         puts("\n\t ");
 215         }
 216 }
 217
 218 /* The TFTP get or put is complete */
 219 static void tftp_complete(void)
 220 {
 221 #ifdef CONFIG_TFTP_TSIZE
 222         /* Print hash marks for the last packet received */
 223         while (TftpTsize && TftpNumchars < 49) {
 224                 putc('#');
 225                 TftpNumchars++;
 226         }
 227 #endif
 228         puts("\ndone\n");
 229         NetState = NETLOOP_SUCCESS;
 230 }
 231
 232 static void
 233 TftpSend(void)
 234 {
 235         volatile uchar *pkt;
 236         volatile uchar *xp;
 237         int             len = 0;
 238         volatile ushort *s;
 239
 240 #ifdef CONFIG_MCAST_TFTP
 241         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 242         if (Multicast
 243          && (TftpState == STATE_DATA)
 244          && (MasterClient == 0))
 245                 return;
 246 #endif
 247         /*
 248          *      We will always be sending some sort of packet, so
 249          *      cobble together the packet headers now.
 250          */
 251         pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
 252
 253         switch (TftpState) {
 254
 255         case STATE_SEND_RRQ:
 256                 xp = pkt;
 257                 s = (ushort *)pkt;
 258                 *s++ = htons(TFTP_RRQ);
 259                 pkt = (uchar *)s;
 260                 strcpy((char *)pkt, tftp_filename);
 261                 pkt += strlen(tftp_filename) + 1;
 262                 strcpy((char *)pkt, "octet");
 263                 pkt += 5 /*strlen("octet")*/ + 1;
 264                 strcpy((char *)pkt, "timeout");
 265                 pkt += 7 /*strlen("timeout")*/ + 1;
 266                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 267                 debug("send option \"timeout %s\"\n", (char *)pkt);
 268                 pkt += strlen((char *)pkt) + 1;
 269 #ifdef CONFIG_TFTP_TSIZE
 270                 memcpy((char *)pkt, "tsize\0000\0", 8);
 271                 pkt += 8;
 272 #endif
 273                 /* try for more effic. blk size */
 274                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 275                                 0, TftpBlkSizeOption, 0);
 276 #ifdef CONFIG_MCAST_TFTP
 277                 /* Check all preconditions before even trying the option */
 278                 if (!ProhibitMcast
 279                  && (Bitmap = malloc(Mapsize))
 280                  && eth_get_dev()->mcast) {
 281                         free(Bitmap);
 282                         Bitmap = NULL;
 283                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 284                 }
 285 #endif /* CONFIG_MCAST_TFTP */
 286                 len = pkt - xp;
 287                 break;
 288
 289         case STATE_OACK:
 290 #ifdef CONFIG_MCAST_TFTP
 291                 /* My turn!  Start at where I need blocks I missed.*/
 292                 if (Multicast)
 293                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 294                                                             (Mapsize*8), 0);
 295                 /*..falling..*/
 296 #endif
 297
 298         case STATE_RECV_WRQ:
 299         case STATE_DATA:
 300                 xp = pkt;
 301                 s = (ushort *)pkt;
 302                 *s++ = htons(TFTP_ACK);
 303                 *s++ = htons(TftpBlock);
 304                 pkt = (uchar *)s;
 305                 len = pkt - xp;
 306                 break;
 307
 308         case STATE_TOO_LARGE:
 309                 xp = pkt;
 310                 s = (ushort *)pkt;
 311                 *s++ = htons(TFTP_ERROR);
 312                 *s++ = htons(3);
 313                 pkt = (uchar *)s;
 314                 strcpy((char *)pkt, "File too large");
 315                 pkt += 14 /*strlen("File too large")*/ + 1;
 316                 len = pkt - xp;
 317                 break;
 318
 319         case STATE_BAD_MAGIC:
 320                 xp = pkt;
 321                 s = (ushort *)pkt;
 322                 *s++ = htons(TFTP_ERROR);
 323                 *s++ = htons(2);
 324                 pkt = (uchar *)s;
 325                 strcpy((char *)pkt, "File has bad magic");
 326                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 327                 len = pkt - xp;
 328                 break;
 329         }
 330
 331         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 332                          TftpOurPort, len);
 333 }
 334
 335
 336 static void
 337 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 338             unsigned len)
 339 {
 340         ushort proto;
 341         ushort *s;
 342         int i;
 343
 344         if (dest != TftpOurPort) {
 345 #ifdef CONFIG_MCAST_TFTP
 346                 if (Multicast
 347                  && (!Mcast_port || (dest != Mcast_port)))
 348 #endif
 349                         return;
 350         }
 351         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 352             TftpState != STATE_RECV_WRQ)
 353                 return;
 354
 355         if (len < 2)
 356                 return;
 357         len -= 2;
 358         /* warning: don't use increment (++) in ntohs() macros!! */
 359         s = (ushort *)pkt;
 360         proto = *s++;
 361         pkt = (uchar *)s;
 362         switch (ntohs(proto)) {
 363
 364         case TFTP_RRQ:
 365         case TFTP_ACK:
 366                 break;
 367         default:
 368                 break;
 369
 370 #ifdef CONFIG_CMD_TFTPSRV
 371         case TFTP_WRQ:
 372                 debug("Got WRQ\n");
 373                 TftpRemoteIP = sip;
 374                 TftpRemotePort = src;
 375                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 376                 TftpLastBlock = 0;
 377                 TftpBlockWrap = 0;
 378                 TftpBlockWrapOffset = 0;
 379                 TftpSend(); /* Send ACK(0) */
 380                 break;
 381 #endif
 382
 383         case TFTP_OACK:
 384                 debug("Got OACK: %s %s\n",
 385                         pkt,
 386                         pkt + strlen((char *)pkt) + 1);
 387                 TftpState = STATE_OACK;
 388                 TftpRemotePort = src;
 389                 /*
 390                  * Check for 'blksize' option.
 391                  * Careful: "i" is signed, "len" is unsigned, thus
 392                  * something like "len-8" may give a *huge* number
 393                  */
 394                 for (i = 0; i+8 < len; i++) {
 395                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 396                                 TftpBlkSize = (unsigned short)
 397                                         simple_strtoul((char *)pkt+i+8, NULL,
 398                                                        10);
 399                                 debug("Blocksize ack: %s, %d\n",
 400                                         (char *)pkt+i+8, TftpBlkSize);
 401                         }
 402 #ifdef CONFIG_TFTP_TSIZE
 403                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 404                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 405                                                            NULL, 10);
 406                                 debug("size = %s, %d\n",
 407                                          (char *)pkt+i+6, TftpTsize);
 408                         }
 409 #endif
 410                 }
 411 #ifdef CONFIG_MCAST_TFTP
 412                 parse_multicast_oack((char *)pkt, len-1);
 413                 if ((Multicast) && (!MasterClient))
 414                         TftpState = STATE_DATA; /* passive.. */
 415                 else
 416 #endif
 417                 TftpSend(); /* Send ACK */
 418                 break;
 419         case TFTP_DATA:
 420                 if (len < 2)
 421                         return;
 422                 len -= 2;
 423                 TftpBlock = ntohs(*(ushort *)pkt);
 424
 425                 /*
 426                  * RFC1350 specifies that the first data packet will
 427                  * have sequence number 1. If we receive a sequence
 428                  * number of 0 this means that there was a wrap
 429                  * around of the (16 bit) counter.
 430                  */
 431                 if (TftpBlock == 0) {
 432                         TftpBlockWrap++;
 433                         TftpBlockWrapOffset +=
 434                                 TftpBlkSize * TFTP_SEQUENCE_SIZE;
 435                         printf("\n\t %lu MB received\n\t ",
 436                                 TftpBlockWrapOffset>>20);
 437                 } else {
 438                         show_block_marker();
 439                 }
 440
 441                 if (TftpState == STATE_SEND_RRQ)
 442                         debug("Server did not acknowledge timeout option!\n");
 443
 444                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 445                     TftpState == STATE_RECV_WRQ) {
 446                         /* first block received */
 447                         TftpState = STATE_DATA;
 448                         TftpRemotePort = src;
 449                         TftpLastBlock = 0;
 450                         TftpBlockWrap = 0;
 451                         TftpBlockWrapOffset = 0;
 452
 453 #ifdef CONFIG_MCAST_TFTP
 454                         if (Multicast) { /* start!=1 common if mcast */
 455                                 TftpLastBlock = TftpBlock - 1;
 456                         } else
 457 #endif
 458                         if (TftpBlock != 1) {   /* Assertion */
 459                                 printf("\nTFTP error: "
 460                                        "First block is not block 1 (%ld)\n"
 461                                        "Starting again\n\n",
 462                                         TftpBlock);
 463                                 NetStartAgain();
 464                                 break;
 465                         }
 466                 }
 467
 468                 if (TftpBlock == TftpLastBlock) {
 469                         /*
 470                          *      Same block again; ignore it.
 471                          */
 472                         break;
 473                 }
 474
 475                 TftpLastBlock = TftpBlock;
 476                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 477                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 478
 479                 store_block(TftpBlock - 1, pkt + 2, len);
 480
 481                 /*
 482                  *      Acknowledge the block just received, which will prompt
 483                  *      the remote for the next one.
 484                  */
 485 #ifdef CONFIG_MCAST_TFTP
 486                 /* if I am the MasterClient, actively calculate what my next
 487                  * needed block is; else I'm passive; not ACKING
 488                  */
 489                 if (Multicast) {
 490                         if (len < TftpBlkSize)  {
 491                                 TftpEndingBlock = TftpBlock;
 492                         } else if (MasterClient) {
 493                                 TftpBlock = PrevBitmapHole =
 494                                         ext2_find_next_zero_bit(
 495                                                 Bitmap,
 496                                                 (Mapsize*8),
 497                                                 PrevBitmapHole);
 498                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 499                                         printf("tftpfile too big\n");
 500                                         /* try to double it and retry */
 501                                         Mapsize <<= 1;
 502                                         mcast_cleanup();
 503                                         NetStartAgain();
 504                                         return;
 505                                 }
 506                                 TftpLastBlock = TftpBlock;
 507                         }
 508                 }
 509 #endif
 510                 TftpSend();
 511
 512 #ifdef CONFIG_MCAST_TFTP
 513                 if (Multicast) {
 514                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 515                                 puts("\nMulticast tftp done\n");
 516                                 mcast_cleanup();
 517                                 NetState = NETLOOP_SUCCESS;
 518                         }
 519                 }
 520                 else
 521 #endif
 522                 if (len < TftpBlkSize)
 523                         tftp_complete();
 524                 break;
 525
 526         case TFTP_ERROR:
 527                 printf("\nTFTP error: '%s' (%d)\n",
 528                        pkt + 2, ntohs(*(ushort *)pkt));
 529
 530                 switch (ntohs(*(ushort *)pkt)) {
 531                 case TFTP_ERR_FILE_NOT_FOUND:
 532                 case TFTP_ERR_ACCESS_DENIED:
 533                         puts("Not retrying...\n");
 534                         eth_halt();
 535                         NetState = NETLOOP_FAIL;
 536                         break;
 537                 case TFTP_ERR_UNDEFINED:
 538                 case TFTP_ERR_DISK_FULL:
 539                 case TFTP_ERR_UNEXPECTED_OPCODE:
 540                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 541                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 542                 default:
 543                         puts("Starting again\n\n");
 544 #ifdef CONFIG_MCAST_TFTP
 545                         mcast_cleanup();
 546 #endif
 547                         NetStartAgain();
 548                         break;
 549                 }
 550                 break;
 551         }
 552 }
 553
 554
 555 static void
 556 TftpTimeout(void)
 557 {
 558         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 559                 puts("\nRetry count exceeded; starting again\n");
 560 #ifdef CONFIG_MCAST_TFTP
 561                 mcast_cleanup();
 562 #endif
 563                 NetStartAgain();
 564         } else {
 565                 puts("T ");
 566                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 567                 if (TftpState != STATE_RECV_WRQ)
 568                         TftpSend();
 569         }
 570 }
 571
 572
 573 void
 574 TftpStart(void)
 575 {
 576         char *ep;             /* Environment pointer */
 577
 578         /*
 579          * Allow the user to choose TFTP blocksize and timeout.
 580          * TFTP protocol has a minimal timeout of 1 second.
 581          */
 582         ep = getenv("tftpblocksize");
 583         if (ep != NULL)
 584                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 585
 586         ep = getenv("tftptimeout");
 587         if (ep != NULL)
 588                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 589
 590         if (TftpTimeoutMSecs < 1000) {
 591                 printf("TFTP timeout (%ld ms) too low, "
 592                         "set minimum = 1000 ms\n",
 593                         TftpTimeoutMSecs);
 594                 TftpTimeoutMSecs = 1000;
 595         }
 596
 597         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 598                 TftpBlkSizeOption, TftpTimeoutMSecs);
 599
 600         TftpRemoteIP = NetServerIP;
 601         if (BootFile[0] == '\0') {
 602                 sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
 603                         NetOurIP & 0xFF,
 604                         (NetOurIP >>  8) & 0xFF,
 605                         (NetOurIP >> 16) & 0xFF,
 606                         (NetOurIP >> 24) & 0xFF);
 607
 608                 strncpy(tftp_filename, default_filename, MAX_LEN);
 609                 tftp_filename[MAX_LEN-1] = 0;
 610
 611                 printf("*** Warning: no boot file name; using '%s'\n",
 612                         tftp_filename);
 613         } else {
 614                 char *p = strchr(BootFile, ':');
 615
 616                 if (p == NULL) {
 617                         strncpy(tftp_filename, BootFile, MAX_LEN);
 618                         tftp_filename[MAX_LEN-1] = 0;
 619                 } else {
 620                         TftpRemoteIP = string_to_ip(BootFile);
 621                         strncpy(tftp_filename, p + 1, MAX_LEN);
 622                         tftp_filename[MAX_LEN-1] = 0;
 623                 }
 624         }
 625
 626         printf("Using %s device\n", eth_get_name());
 627         printf("TFTP from server %pI4"
 628                 "; our IP address is %pI4", &TftpRemoteIP, &NetOurIP);
 629
 630         /* Check if we need to send across this subnet */
 631         if (NetOurGatewayIP && NetOurSubnetMask) {
 632                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 633                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 634
 635                 if (OurNet != RemoteNet)
 636                         printf("; sending through gateway %pI4",
 637                                &NetOurGatewayIP);
 638         }
 639         putc('\n');
 640
 641         printf("Filename '%s'.", tftp_filename);
 642
 643         if (NetBootFileSize) {
 644                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 645                 print_size(NetBootFileSize<<9, "");
 646         }
 647
 648         putc('\n');
 649
 650         printf("Load address: 0x%lx\n", load_addr);
 651
 652         puts("Loading: *\b");
 653
 654         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 655
 656         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 657         NetSetHandler(TftpHandler);
 658
 659         TftpRemotePort = WELL_KNOWN_PORT;
 660         TftpTimeoutCount = 0;
 661         TftpState = STATE_SEND_RRQ;
 662         /* Use a pseudo-random port unless a specific port is set */
 663         TftpOurPort = 1024 + (get_timer(0) % 3072);
 664
 665 #ifdef CONFIG_TFTP_PORT
 666         ep = getenv("tftpdstp");
 667         if (ep != NULL)
 668                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 669         ep = getenv("tftpsrcp");
 670         if (ep != NULL)
 671                 TftpOurPort = simple_strtol(ep, NULL, 10);
 672 #endif
 673         TftpBlock = 0;
 674
 675         /* zero out server ether in case the server ip has changed */
 676         memset(NetServerEther, 0, 6);
 677         /* Revert TftpBlkSize to dflt */
 678         TftpBlkSize = TFTP_BLOCK_SIZE;
 679 #ifdef CONFIG_MCAST_TFTP
 680         mcast_cleanup();
 681 #endif
 682 #ifdef CONFIG_TFTP_TSIZE
 683         TftpTsize = 0;
 684         TftpNumchars = 0;
 685 #endif
 686
 687         TftpSend();
 688 }
 689
 690 #ifdef CONFIG_CMD_TFTPSRV
 691 void
 692 TftpStartServer(void)
 693 {
 694         tftp_filename[0] = 0;
 695
 696         printf("Using %s device\n", eth_get_name());
 697         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 698         printf("Load address: 0x%lx\n", load_addr);
 699
 700         puts("Loading: *\b");
 701
 702         TftpTimeoutCountMax = TIMEOUT_COUNT;
 703         TftpTimeoutCount = 0;
 704         TftpTimeoutMSecs = TIMEOUT;
 705         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 706
 707         /* Revert TftpBlkSize to dflt */
 708         TftpBlkSize = TFTP_BLOCK_SIZE;
 709         TftpBlock = 0;
 710         TftpOurPort = WELL_KNOWN_PORT;
 711
 712 #ifdef CONFIG_TFTP_TSIZE
 713         TftpTsize = 0;
 714         TftpNumchars = 0;
 715 #endif
 716
 717         TftpState = STATE_RECV_WRQ;
 718         NetSetHandler(TftpHandler);
 719 }
 720 #endif /* CONFIG_CMD_TFTPSRV */
 721
 722 #ifdef CONFIG_MCAST_TFTP
 723 /* Credits: atftp project.
 724  */
 725
 726 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 727  * Frame:
 728  *    +-------+-----------+---+-------~~-------+---+
 729  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 730  *    +-------+-----------+---+-------~~-------+---+
 731  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 732  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 733  * master-client, I'm a passive client, gathering what DataBlocks I may and
 734  * making note of which ones I got in my bitmask.
 735  * In theory, I never go from master->passive..
 736  * .. this comes in with pkt already pointing just past opc
 737  */
 738 static void parse_multicast_oack(char *pkt, int len)
 739 {
 740         int i;
 741         IPaddr_t addr;
 742         char *mc_adr, *port,  *mc;
 743
 744         mc_adr = port = mc = NULL;
 745         /* march along looking for 'multicast\0', which has to start at least
 746          * 14 bytes back from the end.
 747          */
 748         for (i = 0; i < len-14; i++)
 749                 if (strcmp(pkt+i, "multicast") == 0)
 750                         break;
 751         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 752                 return;
 753
 754         i += 10; /* strlen multicast */
 755         mc_adr = pkt+i;
 756         for (; i < len; i++) {
 757                 if (*(pkt+i) == ',') {
 758                         *(pkt+i) = '\0';
 759                         if (port) {
 760                                 mc = pkt+i+1;
 761                                 break;
 762                         } else {
 763                                 port = pkt+i+1;
 764                         }
 765                 }
 766         }
 767         if (!port || !mc_adr || !mc)
 768                 return;
 769         if (Multicast && MasterClient) {
 770                 printf("I got a OACK as master Client, WRONG!\n");
 771                 return;
 772         }
 773         /* ..I now accept packets destined for this MCAST addr, port */
 774         if (!Multicast) {
 775                 if (Bitmap) {
 776                         printf("Internal failure! no mcast.\n");
 777                         free(Bitmap);
 778                         Bitmap = NULL;
 779                         ProhibitMcast = 1;
 780                         return ;
 781                 }
 782                 /* I malloc instead of pre-declare; so that if the file ends
 783                  * up being too big for this bitmap I can retry
 784                  */
 785                 Bitmap = malloc(Mapsize);
 786                 if (!Bitmap) {
 787                         printf("No Bitmap, no multicast. Sorry.\n");
 788                         ProhibitMcast = 1;
 789                         return;
 790                 }
 791                 memset(Bitmap, 0, Mapsize);
 792                 PrevBitmapHole = 0;
 793                 Multicast = 1;
 794         }
 795         addr = string_to_ip(mc_adr);
 796         if (Mcast_addr != addr) {
 797                 if (Mcast_addr)
 798                         eth_mcast_join(Mcast_addr, 0);
 799                 Mcast_addr = addr;
 800                 if (eth_mcast_join(Mcast_addr, 1)) {
 801                         printf("Fail to set mcast, revert to TFTP\n");
 802                         ProhibitMcast = 1;
 803                         mcast_cleanup();
 804                         NetStartAgain();
 805                 }
 806         }
 807         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 808         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 809         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 810         return;
 811 }
 812
 813 #endif /* Multicast TFTP */