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 /* Clear our state ready for a new transfer */
 194 void new_transfer(void)
 195 {
 196         TftpLastBlock = 0;
 197         TftpBlockWrap = 0;
 198         TftpBlockWrapOffset = 0;
 199 #ifdef CONFIG_CMD_TFTPPUT
 200         TftpFinalBlock = 0;
 201 #endif
 202 }
 203
 204 static void TftpSend(void);
 205 static void TftpTimeout(void);
 206
 207 /**********************************************************************/
 208
 209 static void show_block_marker(void)
 210 {
 211 #ifdef CONFIG_TFTP_TSIZE
 212         if (TftpTsize) {
 213                 ulong pos = TftpBlock * TftpBlkSize + TftpBlockWrapOffset;
 214
 215                 while (TftpNumchars < pos * 50 / TftpTsize) {
 216                         putc('#');
 217                         TftpNumchars++;
 218                 }
 219         }
 220 #endif
 221         else {
 222                 if (((TftpBlock - 1) % 10) == 0)
 223                         putc('#');
 224                 else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 225                         puts("\n\t ");
 226         }
 227 }
 228
 229 /**
 230  * restart the current transfer due to an error
 231  *
 232  * @param msg   Message to print for user
 233  */
 234 static void restart(const char *msg)
 235 {
 236         printf("\n%s; starting again\n", msg);
 237 #ifdef CONFIG_MCAST_TFTP
 238         mcast_cleanup();
 239 #endif
 240         NetStartAgain();
 241 }
 242
 243 /*
 244  * Check if the block number has wrapped, and update progress
 245  *
 246  * TODO: The egregious use of global variables in this file should be tidied.
 247  */
 248 static void update_block_number(void)
 249 {
 250         /*
 251          * RFC1350 specifies that the first data packet will
 252          * have sequence number 1. If we receive a sequence
 253          * number of 0 this means that there was a wrap
 254          * around of the (16 bit) counter.
 255          */
 256         if (TftpBlock == 0) {
 257                 TftpBlockWrap++;
 258                 TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
 259                 TftpTimeoutCount = 0; /* we've done well, reset thhe timeout */
 260         } else {
 261                 show_block_marker();
 262         }
 263 }
 264
 265 /* The TFTP get or put is complete */
 266 static void tftp_complete(void)
 267 {
 268 #ifdef CONFIG_TFTP_TSIZE
 269         /* Print hash marks for the last packet received */
 270         while (TftpTsize && TftpNumchars < 49) {
 271                 putc('#');
 272                 TftpNumchars++;
 273         }
 274 #endif
 275         puts("\ndone\n");
 276         NetState = NETLOOP_SUCCESS;
 277 }
 278
 279 static void
 280 TftpSend(void)
 281 {
 282         volatile uchar *pkt;
 283         volatile uchar *xp;
 284         int             len = 0;
 285         volatile ushort *s;
 286
 287 #ifdef CONFIG_MCAST_TFTP
 288         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 289         if (Multicast
 290          && (TftpState == STATE_DATA)
 291          && (MasterClient == 0))
 292                 return;
 293 #endif
 294         /*
 295          *      We will always be sending some sort of packet, so
 296          *      cobble together the packet headers now.
 297          */
 298         pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
 299
 300         switch (TftpState) {
 301
 302         case STATE_SEND_RRQ:
 303                 xp = pkt;
 304                 s = (ushort *)pkt;
 305                 *s++ = htons(TFTP_RRQ);
 306                 pkt = (uchar *)s;
 307                 strcpy((char *)pkt, tftp_filename);
 308                 pkt += strlen(tftp_filename) + 1;
 309                 strcpy((char *)pkt, "octet");
 310                 pkt += 5 /*strlen("octet")*/ + 1;
 311                 strcpy((char *)pkt, "timeout");
 312                 pkt += 7 /*strlen("timeout")*/ + 1;
 313                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 314                 debug("send option \"timeout %s\"\n", (char *)pkt);
 315                 pkt += strlen((char *)pkt) + 1;
 316 #ifdef CONFIG_TFTP_TSIZE
 317                 memcpy((char *)pkt, "tsize\0000\0", 8);
 318                 pkt += 8;
 319 #endif
 320                 /* try for more effic. blk size */
 321                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 322                                 0, TftpBlkSizeOption, 0);
 323 #ifdef CONFIG_MCAST_TFTP
 324                 /* Check all preconditions before even trying the option */
 325                 if (!ProhibitMcast
 326                  && (Bitmap = malloc(Mapsize))
 327                  && eth_get_dev()->mcast) {
 328                         free(Bitmap);
 329                         Bitmap = NULL;
 330                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 331                 }
 332 #endif /* CONFIG_MCAST_TFTP */
 333                 len = pkt - xp;
 334                 break;
 335
 336         case STATE_OACK:
 337 #ifdef CONFIG_MCAST_TFTP
 338                 /* My turn!  Start at where I need blocks I missed.*/
 339                 if (Multicast)
 340                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 341                                                             (Mapsize*8), 0);
 342                 /*..falling..*/
 343 #endif
 344
 345         case STATE_RECV_WRQ:
 346         case STATE_DATA:
 347                 xp = pkt;
 348                 s = (ushort *)pkt;
 349                 *s++ = htons(TFTP_ACK);
 350                 *s++ = htons(TftpBlock);
 351                 pkt = (uchar *)s;
 352                 len = pkt - xp;
 353                 break;
 354
 355         case STATE_TOO_LARGE:
 356                 xp = pkt;
 357                 s = (ushort *)pkt;
 358                 *s++ = htons(TFTP_ERROR);
 359                 *s++ = htons(3);
 360                 pkt = (uchar *)s;
 361                 strcpy((char *)pkt, "File too large");
 362                 pkt += 14 /*strlen("File too large")*/ + 1;
 363                 len = pkt - xp;
 364                 break;
 365
 366         case STATE_BAD_MAGIC:
 367                 xp = pkt;
 368                 s = (ushort *)pkt;
 369                 *s++ = htons(TFTP_ERROR);
 370                 *s++ = htons(2);
 371                 pkt = (uchar *)s;
 372                 strcpy((char *)pkt, "File has bad magic");
 373                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 374                 len = pkt - xp;
 375                 break;
 376         }
 377
 378         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 379                          TftpOurPort, len);
 380 }
 381
 382
 383 static void
 384 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 385             unsigned len)
 386 {
 387         ushort proto;
 388         ushort *s;
 389         int i;
 390
 391         if (dest != TftpOurPort) {
 392 #ifdef CONFIG_MCAST_TFTP
 393                 if (Multicast
 394                  && (!Mcast_port || (dest != Mcast_port)))
 395 #endif
 396                         return;
 397         }
 398         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 399             TftpState != STATE_RECV_WRQ)
 400                 return;
 401
 402         if (len < 2)
 403                 return;
 404         len -= 2;
 405         /* warning: don't use increment (++) in ntohs() macros!! */
 406         s = (ushort *)pkt;
 407         proto = *s++;
 408         pkt = (uchar *)s;
 409         switch (ntohs(proto)) {
 410
 411         case TFTP_RRQ:
 412         case TFTP_ACK:
 413                 break;
 414         default:
 415                 break;
 416
 417 #ifdef CONFIG_CMD_TFTPSRV
 418         case TFTP_WRQ:
 419                 debug("Got WRQ\n");
 420                 TftpRemoteIP = sip;
 421                 TftpRemotePort = src;
 422                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 423                 new_transfer();
 424                 TftpSend(); /* Send ACK(0) */
 425                 break;
 426 #endif
 427
 428         case TFTP_OACK:
 429                 debug("Got OACK: %s %s\n",
 430                         pkt,
 431                         pkt + strlen((char *)pkt) + 1);
 432                 TftpState = STATE_OACK;
 433                 TftpRemotePort = src;
 434                 /*
 435                  * Check for 'blksize' option.
 436                  * Careful: "i" is signed, "len" is unsigned, thus
 437                  * something like "len-8" may give a *huge* number
 438                  */
 439                 for (i = 0; i+8 < len; i++) {
 440                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 441                                 TftpBlkSize = (unsigned short)
 442                                         simple_strtoul((char *)pkt+i+8, NULL,
 443                                                        10);
 444                                 debug("Blocksize ack: %s, %d\n",
 445                                         (char *)pkt+i+8, TftpBlkSize);
 446                         }
 447 #ifdef CONFIG_TFTP_TSIZE
 448                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 449                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 450                                                            NULL, 10);
 451                                 debug("size = %s, %d\n",
 452                                          (char *)pkt+i+6, TftpTsize);
 453                         }
 454 #endif
 455                 }
 456 #ifdef CONFIG_MCAST_TFTP
 457                 parse_multicast_oack((char *)pkt, len-1);
 458                 if ((Multicast) && (!MasterClient))
 459                         TftpState = STATE_DATA; /* passive.. */
 460                 else
 461 #endif
 462                 TftpSend(); /* Send ACK */
 463                 break;
 464         case TFTP_DATA:
 465                 if (len < 2)
 466                         return;
 467                 len -= 2;
 468                 TftpBlock = ntohs(*(ushort *)pkt);
 469
 470                 update_block_number();
 471
 472                 if (TftpState == STATE_SEND_RRQ)
 473                         debug("Server did not acknowledge timeout option!\n");
 474
 475                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 476                     TftpState == STATE_RECV_WRQ) {
 477                         /* first block received */
 478                         TftpState = STATE_DATA;
 479                         TftpRemotePort = src;
 480                         new_transfer();
 481
 482 #ifdef CONFIG_MCAST_TFTP
 483                         if (Multicast) { /* start!=1 common if mcast */
 484                                 TftpLastBlock = TftpBlock - 1;
 485                         } else
 486 #endif
 487                         if (TftpBlock != 1) {   /* Assertion */
 488                                 printf("\nTFTP error: "
 489                                        "First block is not block 1 (%ld)\n"
 490                                        "Starting again\n\n",
 491                                         TftpBlock);
 492                                 NetStartAgain();
 493                                 break;
 494                         }
 495                 }
 496
 497                 if (TftpBlock == TftpLastBlock) {
 498                         /*
 499                          *      Same block again; ignore it.
 500                          */
 501                         break;
 502                 }
 503
 504                 TftpLastBlock = TftpBlock;
 505                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 506                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 507
 508                 store_block(TftpBlock - 1, pkt + 2, len);
 509
 510                 /*
 511                  *      Acknowledge the block just received, which will prompt
 512                  *      the remote for the next one.
 513                  */
 514 #ifdef CONFIG_MCAST_TFTP
 515                 /* if I am the MasterClient, actively calculate what my next
 516                  * needed block is; else I'm passive; not ACKING
 517                  */
 518                 if (Multicast) {
 519                         if (len < TftpBlkSize)  {
 520                                 TftpEndingBlock = TftpBlock;
 521                         } else if (MasterClient) {
 522                                 TftpBlock = PrevBitmapHole =
 523                                         ext2_find_next_zero_bit(
 524                                                 Bitmap,
 525                                                 (Mapsize*8),
 526                                                 PrevBitmapHole);
 527                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 528                                         printf("tftpfile too big\n");
 529                                         /* try to double it and retry */
 530                                         Mapsize <<= 1;
 531                                         mcast_cleanup();
 532                                         NetStartAgain();
 533                                         return;
 534                                 }
 535                                 TftpLastBlock = TftpBlock;
 536                         }
 537                 }
 538 #endif
 539                 TftpSend();
 540
 541 #ifdef CONFIG_MCAST_TFTP
 542                 if (Multicast) {
 543                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 544                                 puts("\nMulticast tftp done\n");
 545                                 mcast_cleanup();
 546                                 NetState = NETLOOP_SUCCESS;
 547                         }
 548                 }
 549                 else
 550 #endif
 551                 if (len < TftpBlkSize)
 552                         tftp_complete();
 553                 break;
 554
 555         case TFTP_ERROR:
 556                 printf("\nTFTP error: '%s' (%d)\n",
 557                        pkt + 2, ntohs(*(ushort *)pkt));
 558
 559                 switch (ntohs(*(ushort *)pkt)) {
 560                 case TFTP_ERR_FILE_NOT_FOUND:
 561                 case TFTP_ERR_ACCESS_DENIED:
 562                         puts("Not retrying...\n");
 563                         eth_halt();
 564                         NetState = NETLOOP_FAIL;
 565                         break;
 566                 case TFTP_ERR_UNDEFINED:
 567                 case TFTP_ERR_DISK_FULL:
 568                 case TFTP_ERR_UNEXPECTED_OPCODE:
 569                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 570                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 571                 default:
 572                         puts("Starting again\n\n");
 573 #ifdef CONFIG_MCAST_TFTP
 574                         mcast_cleanup();
 575 #endif
 576                         NetStartAgain();
 577                         break;
 578                 }
 579                 break;
 580         }
 581 }
 582
 583
 584 static void
 585 TftpTimeout(void)
 586 {
 587         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 588                 restart("Retry count exceeded");
 589         } else {
 590                 puts("T ");
 591                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 592                 if (TftpState != STATE_RECV_WRQ)
 593                         TftpSend();
 594         }
 595 }
 596
 597
 598 void
 599 TftpStart(void)
 600 {
 601         char *ep;             /* Environment pointer */
 602
 603         /*
 604          * Allow the user to choose TFTP blocksize and timeout.
 605          * TFTP protocol has a minimal timeout of 1 second.
 606          */
 607         ep = getenv("tftpblocksize");
 608         if (ep != NULL)
 609                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 610
 611         ep = getenv("tftptimeout");
 612         if (ep != NULL)
 613                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 614
 615         if (TftpTimeoutMSecs < 1000) {
 616                 printf("TFTP timeout (%ld ms) too low, "
 617                         "set minimum = 1000 ms\n",
 618                         TftpTimeoutMSecs);
 619                 TftpTimeoutMSecs = 1000;
 620         }
 621
 622         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 623                 TftpBlkSizeOption, TftpTimeoutMSecs);
 624
 625         TftpRemoteIP = NetServerIP;
 626         if (BootFile[0] == '\0') {
 627                 sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
 628                         NetOurIP & 0xFF,
 629                         (NetOurIP >>  8) & 0xFF,
 630                         (NetOurIP >> 16) & 0xFF,
 631                         (NetOurIP >> 24) & 0xFF);
 632
 633                 strncpy(tftp_filename, default_filename, MAX_LEN);
 634                 tftp_filename[MAX_LEN-1] = 0;
 635
 636                 printf("*** Warning: no boot file name; using '%s'\n",
 637                         tftp_filename);
 638         } else {
 639                 char *p = strchr(BootFile, ':');
 640
 641                 if (p == NULL) {
 642                         strncpy(tftp_filename, BootFile, MAX_LEN);
 643                         tftp_filename[MAX_LEN-1] = 0;
 644                 } else {
 645                         TftpRemoteIP = string_to_ip(BootFile);
 646                         strncpy(tftp_filename, p + 1, MAX_LEN);
 647                         tftp_filename[MAX_LEN-1] = 0;
 648                 }
 649         }
 650
 651         printf("Using %s device\n", eth_get_name());
 652         printf("TFTP from server %pI4"
 653                 "; our IP address is %pI4", &TftpRemoteIP, &NetOurIP);
 654
 655         /* Check if we need to send across this subnet */
 656         if (NetOurGatewayIP && NetOurSubnetMask) {
 657                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 658                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 659
 660                 if (OurNet != RemoteNet)
 661                         printf("; sending through gateway %pI4",
 662                                &NetOurGatewayIP);
 663         }
 664         putc('\n');
 665
 666         printf("Filename '%s'.", tftp_filename);
 667
 668         if (NetBootFileSize) {
 669                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 670                 print_size(NetBootFileSize<<9, "");
 671         }
 672
 673         putc('\n');
 674
 675         printf("Load address: 0x%lx\n", load_addr);
 676
 677         puts("Loading: *\b");
 678
 679         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 680
 681         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 682         NetSetHandler(TftpHandler);
 683
 684         TftpRemotePort = WELL_KNOWN_PORT;
 685         TftpTimeoutCount = 0;
 686         TftpState = STATE_SEND_RRQ;
 687         /* Use a pseudo-random port unless a specific port is set */
 688         TftpOurPort = 1024 + (get_timer(0) % 3072);
 689
 690 #ifdef CONFIG_TFTP_PORT
 691         ep = getenv("tftpdstp");
 692         if (ep != NULL)
 693                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 694         ep = getenv("tftpsrcp");
 695         if (ep != NULL)
 696                 TftpOurPort = simple_strtol(ep, NULL, 10);
 697 #endif
 698         TftpBlock = 0;
 699
 700         /* zero out server ether in case the server ip has changed */
 701         memset(NetServerEther, 0, 6);
 702         /* Revert TftpBlkSize to dflt */
 703         TftpBlkSize = TFTP_BLOCK_SIZE;
 704 #ifdef CONFIG_MCAST_TFTP
 705         mcast_cleanup();
 706 #endif
 707 #ifdef CONFIG_TFTP_TSIZE
 708         TftpTsize = 0;
 709         TftpNumchars = 0;
 710 #endif
 711
 712         TftpSend();
 713 }
 714
 715 #ifdef CONFIG_CMD_TFTPSRV
 716 void
 717 TftpStartServer(void)
 718 {
 719         tftp_filename[0] = 0;
 720
 721         printf("Using %s device\n", eth_get_name());
 722         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 723         printf("Load address: 0x%lx\n", load_addr);
 724
 725         puts("Loading: *\b");
 726
 727         TftpTimeoutCountMax = TIMEOUT_COUNT;
 728         TftpTimeoutCount = 0;
 729         TftpTimeoutMSecs = TIMEOUT;
 730         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 731
 732         /* Revert TftpBlkSize to dflt */
 733         TftpBlkSize = TFTP_BLOCK_SIZE;
 734         TftpBlock = 0;
 735         TftpOurPort = WELL_KNOWN_PORT;
 736
 737 #ifdef CONFIG_TFTP_TSIZE
 738         TftpTsize = 0;
 739         TftpNumchars = 0;
 740 #endif
 741
 742         TftpState = STATE_RECV_WRQ;
 743         NetSetHandler(TftpHandler);
 744 }
 745 #endif /* CONFIG_CMD_TFTPSRV */
 746
 747 #ifdef CONFIG_MCAST_TFTP
 748 /* Credits: atftp project.
 749  */
 750
 751 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 752  * Frame:
 753  *    +-------+-----------+---+-------~~-------+---+
 754  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 755  *    +-------+-----------+---+-------~~-------+---+
 756  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 757  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 758  * master-client, I'm a passive client, gathering what DataBlocks I may and
 759  * making note of which ones I got in my bitmask.
 760  * In theory, I never go from master->passive..
 761  * .. this comes in with pkt already pointing just past opc
 762  */
 763 static void parse_multicast_oack(char *pkt, int len)
 764 {
 765         int i;
 766         IPaddr_t addr;
 767         char *mc_adr, *port,  *mc;
 768
 769         mc_adr = port = mc = NULL;
 770         /* march along looking for 'multicast\0', which has to start at least
 771          * 14 bytes back from the end.
 772          */
 773         for (i = 0; i < len-14; i++)
 774                 if (strcmp(pkt+i, "multicast") == 0)
 775                         break;
 776         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 777                 return;
 778
 779         i += 10; /* strlen multicast */
 780         mc_adr = pkt+i;
 781         for (; i < len; i++) {
 782                 if (*(pkt+i) == ',') {
 783                         *(pkt+i) = '\0';
 784                         if (port) {
 785                                 mc = pkt+i+1;
 786                                 break;
 787                         } else {
 788                                 port = pkt+i+1;
 789                         }
 790                 }
 791         }
 792         if (!port || !mc_adr || !mc)
 793                 return;
 794         if (Multicast && MasterClient) {
 795                 printf("I got a OACK as master Client, WRONG!\n");
 796                 return;
 797         }
 798         /* ..I now accept packets destined for this MCAST addr, port */
 799         if (!Multicast) {
 800                 if (Bitmap) {
 801                         printf("Internal failure! no mcast.\n");
 802                         free(Bitmap);
 803                         Bitmap = NULL;
 804                         ProhibitMcast = 1;
 805                         return ;
 806                 }
 807                 /* I malloc instead of pre-declare; so that if the file ends
 808                  * up being too big for this bitmap I can retry
 809                  */
 810                 Bitmap = malloc(Mapsize);
 811                 if (!Bitmap) {
 812                         printf("No Bitmap, no multicast. Sorry.\n");
 813                         ProhibitMcast = 1;
 814                         return;
 815                 }
 816                 memset(Bitmap, 0, Mapsize);
 817                 PrevBitmapHole = 0;
 818                 Multicast = 1;
 819         }
 820         addr = string_to_ip(mc_adr);
 821         if (Mcast_addr != addr) {
 822                 if (Mcast_addr)
 823                         eth_mcast_join(Mcast_addr, 0);
 824                 Mcast_addr = addr;
 825                 if (eth_mcast_join(Mcast_addr, 1)) {
 826                         printf("Fail to set mcast, revert to TFTP\n");
 827                         ProhibitMcast = 1;
 828                         mcast_cleanup();
 829                         NetStartAgain();
 830                 }
 831         }
 832         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 833         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 834         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 835         return;
 836 }
 837
 838 #endif /* Multicast TFTP */