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
 199 TftpSend(void)
 200 {
 201         volatile uchar *pkt;
 202         volatile uchar *xp;
 203         int             len = 0;
 204         volatile ushort *s;
 205
 206 #ifdef CONFIG_MCAST_TFTP
 207         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 208         if (Multicast
 209          && (TftpState == STATE_DATA)
 210          && (MasterClient == 0))
 211                 return;
 212 #endif
 213         /*
 214          *      We will always be sending some sort of packet, so
 215          *      cobble together the packet headers now.
 216          */
 217         pkt = NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE;
 218
 219         switch (TftpState) {
 220
 221         case STATE_SEND_RRQ:
 222                 xp = pkt;
 223                 s = (ushort *)pkt;
 224                 *s++ = htons(TFTP_RRQ);
 225                 pkt = (uchar *)s;
 226                 strcpy((char *)pkt, tftp_filename);
 227                 pkt += strlen(tftp_filename) + 1;
 228                 strcpy((char *)pkt, "octet");
 229                 pkt += 5 /*strlen("octet")*/ + 1;
 230                 strcpy((char *)pkt, "timeout");
 231                 pkt += 7 /*strlen("timeout")*/ + 1;
 232                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 233                 debug("send option \"timeout %s\"\n", (char *)pkt);
 234                 pkt += strlen((char *)pkt) + 1;
 235 #ifdef CONFIG_TFTP_TSIZE
 236                 memcpy((char *)pkt, "tsize\0000\0", 8);
 237                 pkt += 8;
 238 #endif
 239                 /* try for more effic. blk size */
 240                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 241                                 0, TftpBlkSizeOption, 0);
 242 #ifdef CONFIG_MCAST_TFTP
 243                 /* Check all preconditions before even trying the option */
 244                 if (!ProhibitMcast
 245                  && (Bitmap = malloc(Mapsize))
 246                  && eth_get_dev()->mcast) {
 247                         free(Bitmap);
 248                         Bitmap = NULL;
 249                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 250                 }
 251 #endif /* CONFIG_MCAST_TFTP */
 252                 len = pkt - xp;
 253                 break;
 254
 255         case STATE_OACK:
 256 #ifdef CONFIG_MCAST_TFTP
 257                 /* My turn!  Start at where I need blocks I missed.*/
 258                 if (Multicast)
 259                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 260                                                             (Mapsize*8), 0);
 261                 /*..falling..*/
 262 #endif
 263
 264         case STATE_RECV_WRQ:
 265         case STATE_DATA:
 266                 xp = pkt;
 267                 s = (ushort *)pkt;
 268                 *s++ = htons(TFTP_ACK);
 269                 *s++ = htons(TftpBlock);
 270                 pkt = (uchar *)s;
 271                 len = pkt - xp;
 272                 break;
 273
 274         case STATE_TOO_LARGE:
 275                 xp = pkt;
 276                 s = (ushort *)pkt;
 277                 *s++ = htons(TFTP_ERROR);
 278                 *s++ = htons(3);
 279                 pkt = (uchar *)s;
 280                 strcpy((char *)pkt, "File too large");
 281                 pkt += 14 /*strlen("File too large")*/ + 1;
 282                 len = pkt - xp;
 283                 break;
 284
 285         case STATE_BAD_MAGIC:
 286                 xp = pkt;
 287                 s = (ushort *)pkt;
 288                 *s++ = htons(TFTP_ERROR);
 289                 *s++ = htons(2);
 290                 pkt = (uchar *)s;
 291                 strcpy((char *)pkt, "File has bad magic");
 292                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 293                 len = pkt - xp;
 294                 break;
 295         }
 296
 297         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 298                          TftpOurPort, len);
 299 }
 300
 301
 302 static void
 303 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 304             unsigned len)
 305 {
 306         ushort proto;
 307         ushort *s;
 308         int i;
 309
 310         if (dest != TftpOurPort) {
 311 #ifdef CONFIG_MCAST_TFTP
 312                 if (Multicast
 313                  && (!Mcast_port || (dest != Mcast_port)))
 314 #endif
 315                         return;
 316         }
 317         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 318             TftpState != STATE_RECV_WRQ)
 319                 return;
 320
 321         if (len < 2)
 322                 return;
 323         len -= 2;
 324         /* warning: don't use increment (++) in ntohs() macros!! */
 325         s = (ushort *)pkt;
 326         proto = *s++;
 327         pkt = (uchar *)s;
 328         switch (ntohs(proto)) {
 329
 330         case TFTP_RRQ:
 331         case TFTP_ACK:
 332                 break;
 333         default:
 334                 break;
 335
 336 #ifdef CONFIG_CMD_TFTPSRV
 337         case TFTP_WRQ:
 338                 debug("Got WRQ\n");
 339                 TftpRemoteIP = sip;
 340                 TftpRemotePort = src;
 341                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 342                 TftpLastBlock = 0;
 343                 TftpBlockWrap = 0;
 344                 TftpBlockWrapOffset = 0;
 345                 TftpSend(); /* Send ACK(0) */
 346                 break;
 347 #endif
 348
 349         case TFTP_OACK:
 350                 debug("Got OACK: %s %s\n",
 351                         pkt,
 352                         pkt + strlen((char *)pkt) + 1);
 353                 TftpState = STATE_OACK;
 354                 TftpRemotePort = src;
 355                 /*
 356                  * Check for 'blksize' option.
 357                  * Careful: "i" is signed, "len" is unsigned, thus
 358                  * something like "len-8" may give a *huge* number
 359                  */
 360                 for (i = 0; i+8 < len; i++) {
 361                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 362                                 TftpBlkSize = (unsigned short)
 363                                         simple_strtoul((char *)pkt+i+8, NULL,
 364                                                        10);
 365                                 debug("Blocksize ack: %s, %d\n",
 366                                         (char *)pkt+i+8, TftpBlkSize);
 367                         }
 368 #ifdef CONFIG_TFTP_TSIZE
 369                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 370                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 371                                                            NULL, 10);
 372                                 debug("size = %s, %d\n",
 373                                          (char *)pkt+i+6, TftpTsize);
 374                         }
 375 #endif
 376                 }
 377 #ifdef CONFIG_MCAST_TFTP
 378                 parse_multicast_oack((char *)pkt, len-1);
 379                 if ((Multicast) && (!MasterClient))
 380                         TftpState = STATE_DATA; /* passive.. */
 381                 else
 382 #endif
 383                 TftpSend(); /* Send ACK */
 384                 break;
 385         case TFTP_DATA:
 386                 if (len < 2)
 387                         return;
 388                 len -= 2;
 389                 TftpBlock = ntohs(*(ushort *)pkt);
 390
 391                 /*
 392                  * RFC1350 specifies that the first data packet will
 393                  * have sequence number 1. If we receive a sequence
 394                  * number of 0 this means that there was a wrap
 395                  * around of the (16 bit) counter.
 396                  */
 397                 if (TftpBlock == 0) {
 398                         TftpBlockWrap++;
 399                         TftpBlockWrapOffset +=
 400                                 TftpBlkSize * TFTP_SEQUENCE_SIZE;
 401                         printf("\n\t %lu MB received\n\t ",
 402                                 TftpBlockWrapOffset>>20);
 403                 }
 404 #ifdef CONFIG_TFTP_TSIZE
 405                 else if (TftpTsize) {
 406                         while (TftpNumchars <
 407                                NetBootFileXferSize * 50 / TftpTsize) {
 408                                 putc('#');
 409                                 TftpNumchars++;
 410                         }
 411                 }
 412 #endif
 413                 else {
 414                         if (((TftpBlock - 1) % 10) == 0)
 415                                 putc('#');
 416                         else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 417                                 puts("\n\t ");
 418                 }
 419
 420                 if (TftpState == STATE_SEND_RRQ)
 421                         debug("Server did not acknowledge timeout option!\n");
 422
 423                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 424                     TftpState == STATE_RECV_WRQ) {
 425                         /* first block received */
 426                         TftpState = STATE_DATA;
 427                         TftpRemotePort = src;
 428                         TftpLastBlock = 0;
 429                         TftpBlockWrap = 0;
 430                         TftpBlockWrapOffset = 0;
 431
 432 #ifdef CONFIG_MCAST_TFTP
 433                         if (Multicast) { /* start!=1 common if mcast */
 434                                 TftpLastBlock = TftpBlock - 1;
 435                         } else
 436 #endif
 437                         if (TftpBlock != 1) {   /* Assertion */
 438                                 printf("\nTFTP error: "
 439                                        "First block is not block 1 (%ld)\n"
 440                                        "Starting again\n\n",
 441                                         TftpBlock);
 442                                 NetStartAgain();
 443                                 break;
 444                         }
 445                 }
 446
 447                 if (TftpBlock == TftpLastBlock) {
 448                         /*
 449                          *      Same block again; ignore it.
 450                          */
 451                         break;
 452                 }
 453
 454                 TftpLastBlock = TftpBlock;
 455                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 456                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 457
 458                 store_block(TftpBlock - 1, pkt + 2, len);
 459
 460                 /*
 461                  *      Acknowledge the block just received, which will prompt
 462                  *      the remote for the next one.
 463                  */
 464 #ifdef CONFIG_MCAST_TFTP
 465                 /* if I am the MasterClient, actively calculate what my next
 466                  * needed block is; else I'm passive; not ACKING
 467                  */
 468                 if (Multicast) {
 469                         if (len < TftpBlkSize)  {
 470                                 TftpEndingBlock = TftpBlock;
 471                         } else if (MasterClient) {
 472                                 TftpBlock = PrevBitmapHole =
 473                                         ext2_find_next_zero_bit(
 474                                                 Bitmap,
 475                                                 (Mapsize*8),
 476                                                 PrevBitmapHole);
 477                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 478                                         printf("tftpfile too big\n");
 479                                         /* try to double it and retry */
 480                                         Mapsize <<= 1;
 481                                         mcast_cleanup();
 482                                         NetStartAgain();
 483                                         return;
 484                                 }
 485                                 TftpLastBlock = TftpBlock;
 486                         }
 487                 }
 488 #endif
 489                 TftpSend();
 490
 491 #ifdef CONFIG_MCAST_TFTP
 492                 if (Multicast) {
 493                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 494                                 puts("\nMulticast tftp done\n");
 495                                 mcast_cleanup();
 496                                 NetState = NETLOOP_SUCCESS;
 497                         }
 498                 }
 499                 else
 500 #endif
 501                 if (len < TftpBlkSize) {
 502                         /*
 503                          *      We received the whole thing.  Try to
 504                          *      run it.
 505                          */
 506 #ifdef CONFIG_TFTP_TSIZE
 507                         /* Print hash marks for the last packet received */
 508                         while (TftpTsize && TftpNumchars < 49) {
 509                                 putc('#');
 510                                 TftpNumchars++;
 511                         }
 512 #endif
 513                         puts("\ndone\n");
 514                         NetState = NETLOOP_SUCCESS;
 515                 }
 516                 break;
 517
 518         case TFTP_ERROR:
 519                 printf("\nTFTP error: '%s' (%d)\n",
 520                        pkt + 2, ntohs(*(ushort *)pkt));
 521
 522                 switch (ntohs(*(ushort *)pkt)) {
 523                 case TFTP_ERR_FILE_NOT_FOUND:
 524                 case TFTP_ERR_ACCESS_DENIED:
 525                         puts("Not retrying...\n");
 526                         eth_halt();
 527                         NetState = NETLOOP_FAIL;
 528                         break;
 529                 case TFTP_ERR_UNDEFINED:
 530                 case TFTP_ERR_DISK_FULL:
 531                 case TFTP_ERR_UNEXPECTED_OPCODE:
 532                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 533                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 534                 default:
 535                         puts("Starting again\n\n");
 536 #ifdef CONFIG_MCAST_TFTP
 537                         mcast_cleanup();
 538 #endif
 539                         NetStartAgain();
 540                         break;
 541                 }
 542                 break;
 543         }
 544 }
 545
 546
 547 static void
 548 TftpTimeout(void)
 549 {
 550         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 551                 puts("\nRetry count exceeded; starting again\n");
 552 #ifdef CONFIG_MCAST_TFTP
 553                 mcast_cleanup();
 554 #endif
 555                 NetStartAgain();
 556         } else {
 557                 puts("T ");
 558                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 559                 if (TftpState != STATE_RECV_WRQ)
 560                         TftpSend();
 561         }
 562 }
 563
 564
 565 void
 566 TftpStart(void)
 567 {
 568         char *ep;             /* Environment pointer */
 569
 570         /*
 571          * Allow the user to choose TFTP blocksize and timeout.
 572          * TFTP protocol has a minimal timeout of 1 second.
 573          */
 574         ep = getenv("tftpblocksize");
 575         if (ep != NULL)
 576                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 577
 578         ep = getenv("tftptimeout");
 579         if (ep != NULL)
 580                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 581
 582         if (TftpTimeoutMSecs < 1000) {
 583                 printf("TFTP timeout (%ld ms) too low, "
 584                         "set minimum = 1000 ms\n",
 585                         TftpTimeoutMSecs);
 586                 TftpTimeoutMSecs = 1000;
 587         }
 588
 589         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 590                 TftpBlkSizeOption, TftpTimeoutMSecs);
 591
 592         TftpRemoteIP = NetServerIP;
 593         if (BootFile[0] == '\0') {
 594                 sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
 595                         NetOurIP & 0xFF,
 596                         (NetOurIP >>  8) & 0xFF,
 597                         (NetOurIP >> 16) & 0xFF,
 598                         (NetOurIP >> 24) & 0xFF);
 599
 600                 strncpy(tftp_filename, default_filename, MAX_LEN);
 601                 tftp_filename[MAX_LEN-1] = 0;
 602
 603                 printf("*** Warning: no boot file name; using '%s'\n",
 604                         tftp_filename);
 605         } else {
 606                 char *p = strchr(BootFile, ':');
 607
 608                 if (p == NULL) {
 609                         strncpy(tftp_filename, BootFile, MAX_LEN);
 610                         tftp_filename[MAX_LEN-1] = 0;
 611                 } else {
 612                         TftpRemoteIP = string_to_ip(BootFile);
 613                         strncpy(tftp_filename, p + 1, MAX_LEN);
 614                         tftp_filename[MAX_LEN-1] = 0;
 615                 }
 616         }
 617
 618 #if defined(CONFIG_NET_MULTI)
 619         printf("Using %s device\n", eth_get_name());
 620 #endif
 621         printf("TFTP from server %pI4"
 622                 "; our IP address is %pI4", &TftpRemoteIP, &NetOurIP);
 623
 624         /* Check if we need to send across this subnet */
 625         if (NetOurGatewayIP && NetOurSubnetMask) {
 626                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 627                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 628
 629                 if (OurNet != RemoteNet)
 630                         printf("; sending through gateway %pI4",
 631                                &NetOurGatewayIP);
 632         }
 633         putc('\n');
 634
 635         printf("Filename '%s'.", tftp_filename);
 636
 637         if (NetBootFileSize) {
 638                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 639                 print_size(NetBootFileSize<<9, "");
 640         }
 641
 642         putc('\n');
 643
 644         printf("Load address: 0x%lx\n", load_addr);
 645
 646         puts("Loading: *\b");
 647
 648         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 649
 650         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 651         NetSetHandler(TftpHandler);
 652
 653         TftpRemotePort = WELL_KNOWN_PORT;
 654         TftpTimeoutCount = 0;
 655         TftpState = STATE_SEND_RRQ;
 656         /* Use a pseudo-random port unless a specific port is set */
 657         TftpOurPort = 1024 + (get_timer(0) % 3072);
 658
 659 #ifdef CONFIG_TFTP_PORT
 660         ep = getenv("tftpdstp");
 661         if (ep != NULL)
 662                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 663         ep = getenv("tftpsrcp");
 664         if (ep != NULL)
 665                 TftpOurPort = simple_strtol(ep, NULL, 10);
 666 #endif
 667         TftpBlock = 0;
 668
 669         /* zero out server ether in case the server ip has changed */
 670         memset(NetServerEther, 0, 6);
 671         /* Revert TftpBlkSize to dflt */
 672         TftpBlkSize = TFTP_BLOCK_SIZE;
 673 #ifdef CONFIG_MCAST_TFTP
 674         mcast_cleanup();
 675 #endif
 676 #ifdef CONFIG_TFTP_TSIZE
 677         TftpTsize = 0;
 678         TftpNumchars = 0;
 679 #endif
 680
 681         TftpSend();
 682 }
 683
 684 #ifdef CONFIG_CMD_TFTPSRV
 685 void
 686 TftpStartServer(void)
 687 {
 688         tftp_filename[0] = 0;
 689
 690 #if defined(CONFIG_NET_MULTI)
 691         printf("Using %s device\n", eth_get_name());
 692 #endif
 693         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 694         printf("Load address: 0x%lx\n", load_addr);
 695
 696         puts("Loading: *\b");
 697
 698         TftpTimeoutCountMax = TIMEOUT_COUNT;
 699         TftpTimeoutCount = 0;
 700         TftpTimeoutMSecs = TIMEOUT;
 701         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 702
 703         /* Revert TftpBlkSize to dflt */
 704         TftpBlkSize = TFTP_BLOCK_SIZE;
 705         TftpBlock = 0;
 706         TftpOurPort = WELL_KNOWN_PORT;
 707
 708 #ifdef CONFIG_TFTP_TSIZE
 709         TftpTsize = 0;
 710         TftpNumchars = 0;
 711 #endif
 712
 713         TftpState = STATE_RECV_WRQ;
 714         NetSetHandler(TftpHandler);
 715 }
 716 #endif /* CONFIG_CMD_TFTPSRV */
 717
 718 #ifdef CONFIG_MCAST_TFTP
 719 /* Credits: atftp project.
 720  */
 721
 722 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 723  * Frame:
 724  *    +-------+-----------+---+-------~~-------+---+
 725  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 726  *    +-------+-----------+---+-------~~-------+---+
 727  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 728  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 729  * master-client, I'm a passive client, gathering what DataBlocks I may and
 730  * making note of which ones I got in my bitmask.
 731  * In theory, I never go from master->passive..
 732  * .. this comes in with pkt already pointing just past opc
 733  */
 734 static void parse_multicast_oack(char *pkt, int len)
 735 {
 736         int i;
 737         IPaddr_t addr;
 738         char *mc_adr, *port,  *mc;
 739
 740         mc_adr = port = mc = NULL;
 741         /* march along looking for 'multicast\0', which has to start at least
 742          * 14 bytes back from the end.
 743          */
 744         for (i = 0; i < len-14; i++)
 745                 if (strcmp(pkt+i, "multicast") == 0)
 746                         break;
 747         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 748                 return;
 749
 750         i += 10; /* strlen multicast */
 751         mc_adr = pkt+i;
 752         for (; i < len; i++) {
 753                 if (*(pkt+i) == ',') {
 754                         *(pkt+i) = '\0';
 755                         if (port) {
 756                                 mc = pkt+i+1;
 757                                 break;
 758                         } else {
 759                                 port = pkt+i+1;
 760                         }
 761                 }
 762         }
 763         if (!port || !mc_adr || !mc)
 764                 return;
 765         if (Multicast && MasterClient) {
 766                 printf("I got a OACK as master Client, WRONG!\n");
 767                 return;
 768         }
 769         /* ..I now accept packets destined for this MCAST addr, port */
 770         if (!Multicast) {
 771                 if (Bitmap) {
 772                         printf("Internal failure! no mcast.\n");
 773                         free(Bitmap);
 774                         Bitmap = NULL;
 775                         ProhibitMcast = 1;
 776                         return ;
 777                 }
 778                 /* I malloc instead of pre-declare; so that if the file ends
 779                  * up being too big for this bitmap I can retry
 780                  */
 781                 Bitmap = malloc(Mapsize);
 782                 if (!Bitmap) {
 783                         printf("No Bitmap, no multicast. Sorry.\n");
 784                         ProhibitMcast = 1;
 785                         return;
 786                 }
 787                 memset(Bitmap, 0, Mapsize);
 788                 PrevBitmapHole = 0;
 789                 Multicast = 1;
 790         }
 791         addr = string_to_ip(mc_adr);
 792         if (Mcast_addr != addr) {
 793                 if (Mcast_addr)
 794                         eth_mcast_join(Mcast_addr, 0);
 795                 Mcast_addr = addr;
 796                 if (eth_mcast_join(Mcast_addr, 1)) {
 797                         printf("Fail to set mcast, revert to TFTP\n");
 798                         ProhibitMcast = 1;
 799                         mcast_cleanup();
 800                         NetStartAgain();
 801                 }
 802         }
 803         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 804         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 805         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 806         return;
 807 }
 808
 809 #endif /* Multicast TFTP */