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 #ifdef CONFIG_CMD_TFTPPUT
  85 static int      TftpWriting;    /* 1 if writing, else 0 */
  86 static int      TftpFinalBlock; /* 1 if we have sent the last block */
  87 #else
  88 #define TftpWriting     0
  89 #endif
  90
  91 #define STATE_SEND_RRQ  1
  92 #define STATE_DATA      2
  93 #define STATE_TOO_LARGE 3
  94 #define STATE_BAD_MAGIC 4
  95 #define STATE_OACK      5
  96 #define STATE_RECV_WRQ  6
  97 #define STATE_SEND_WRQ  7
  98
  99 /* default TFTP block size */
 100 #define TFTP_BLOCK_SIZE         512
 101 /* sequence number is 16 bit */
 102 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 103
 104 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 105 static char default_filename[DEFAULT_NAME_LEN];
 106
 107 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 108 #define MAX_LEN 128
 109 #else
 110 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 111 #endif
 112
 113 static char tftp_filename[MAX_LEN];
 114
 115 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 116 extern flash_info_t flash_info[];
 117 #endif
 118
 119 /* 512 is poor choice for ethernet, MTU is typically 1500.
 120  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 121  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 122  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 123  */
 124 #ifdef CONFIG_TFTP_BLOCKSIZE
 125 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 126 #else
 127 #define TFTP_MTU_BLOCKSIZE 1468
 128 #endif
 129
 130 static unsigned short TftpBlkSize = TFTP_BLOCK_SIZE;
 131 static unsigned short TftpBlkSizeOption = TFTP_MTU_BLOCKSIZE;
 132
 133 #ifdef CONFIG_MCAST_TFTP
 134 #include <malloc.h>
 135 #define MTFTP_BITMAPSIZE        0x1000
 136 static unsigned *Bitmap;
 137 static int PrevBitmapHole, Mapsize = MTFTP_BITMAPSIZE;
 138 static uchar ProhibitMcast, MasterClient;
 139 static uchar Multicast;
 140 extern IPaddr_t Mcast_addr;
 141 static int Mcast_port;
 142 static ulong TftpEndingBlock; /* can get 'last' block before done..*/
 143
 144 static void parse_multicast_oack(char *pkt, int len);
 145
 146 static void
 147 mcast_cleanup(void)
 148 {
 149         if (Mcast_addr)
 150                 eth_mcast_join(Mcast_addr, 0);
 151         if (Bitmap)
 152                 free(Bitmap);
 153         Bitmap = NULL;
 154         Mcast_addr = Multicast = Mcast_port = 0;
 155         TftpEndingBlock = -1;
 156 }
 157
 158 #endif  /* CONFIG_MCAST_TFTP */
 159
 160 static __inline__ void
 161 store_block(unsigned block, uchar *src, unsigned len)
 162 {
 163         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 164         ulong newsize = offset + len;
 165 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 166         int i, rc = 0;
 167
 168         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 169                 /* start address in flash? */
 170                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 171                         continue;
 172                 if (load_addr + offset >= flash_info[i].start[0]) {
 173                         rc = 1;
 174                         break;
 175                 }
 176         }
 177
 178         if (rc) { /* Flash is destination for this packet */
 179                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 180                 if (rc) {
 181                         flash_perror(rc);
 182                         NetState = NETLOOP_FAIL;
 183                         return;
 184                 }
 185         }
 186         else
 187 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 188         {
 189                 (void)memcpy((void *)(load_addr + offset), src, len);
 190         }
 191 #ifdef CONFIG_MCAST_TFTP
 192         if (Multicast)
 193                 ext2_set_bit(block, Bitmap);
 194 #endif
 195
 196         if (NetBootFileXferSize < newsize)
 197                 NetBootFileXferSize = newsize;
 198 }
 199
 200 /* Clear our state ready for a new transfer */
 201 static void new_transfer(void)
 202 {
 203         TftpLastBlock = 0;
 204         TftpBlockWrap = 0;
 205         TftpBlockWrapOffset = 0;
 206 #ifdef CONFIG_CMD_TFTPPUT
 207         TftpFinalBlock = 0;
 208 #endif
 209 }
 210
 211 #ifdef CONFIG_CMD_TFTPPUT
 212 /**
 213  * Load the next block from memory to be sent over tftp.
 214  *
 215  * @param block Block number to send
 216  * @param dst   Destination buffer for data
 217  * @param len   Number of bytes in block (this one and every other)
 218  * @return number of bytes loaded
 219  */
 220 static int load_block(unsigned block, uchar *dst, unsigned len)
 221 {
 222         /* We may want to get the final block from the previous set */
 223         ulong offset = ((int)block - 1) * len + TftpBlockWrapOffset;
 224         ulong tosend = len;
 225
 226         tosend = min(NetBootFileXferSize - offset, tosend);
 227         (void)memcpy(dst, (void *)(save_addr + offset), tosend);
 228         debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
 229                 block, offset, len, tosend);
 230         return tosend;
 231 }
 232 #endif
 233
 234 static void TftpSend(void);
 235 static void TftpTimeout(void);
 236
 237 /**********************************************************************/
 238
 239 static void show_block_marker(void)
 240 {
 241 #ifdef CONFIG_TFTP_TSIZE
 242         if (TftpTsize) {
 243                 ulong pos = TftpBlock * TftpBlkSize + TftpBlockWrapOffset;
 244
 245                 while (TftpNumchars < pos * 50 / TftpTsize) {
 246                         putc('#');
 247                         TftpNumchars++;
 248                 }
 249         } else
 250 #endif
 251         {
 252                 if (((TftpBlock - 1) % 10) == 0)
 253                         putc('#');
 254                 else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 255                         puts("\n\t ");
 256         }
 257 }
 258
 259 /**
 260  * restart the current transfer due to an error
 261  *
 262  * @param msg   Message to print for user
 263  */
 264 static void restart(const char *msg)
 265 {
 266         printf("\n%s; starting again\n", msg);
 267 #ifdef CONFIG_MCAST_TFTP
 268         mcast_cleanup();
 269 #endif
 270         NetStartAgain();
 271 }
 272
 273 /*
 274  * Check if the block number has wrapped, and update progress
 275  *
 276  * TODO: The egregious use of global variables in this file should be tidied.
 277  */
 278 static void update_block_number(void)
 279 {
 280         /*
 281          * RFC1350 specifies that the first data packet will
 282          * have sequence number 1. If we receive a sequence
 283          * number of 0 this means that there was a wrap
 284          * around of the (16 bit) counter.
 285          */
 286         if (TftpBlock == 0) {
 287                 TftpBlockWrap++;
 288                 TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
 289                 TftpTimeoutCount = 0; /* we've done well, reset thhe timeout */
 290         } else {
 291                 show_block_marker();
 292         }
 293 }
 294
 295 /* The TFTP get or put is complete */
 296 static void tftp_complete(void)
 297 {
 298 #ifdef CONFIG_TFTP_TSIZE
 299         /* Print hash marks for the last packet received */
 300         while (TftpTsize && TftpNumchars < 49) {
 301                 putc('#');
 302                 TftpNumchars++;
 303         }
 304 #endif
 305         puts("\ndone\n");
 306         NetState = NETLOOP_SUCCESS;
 307 }
 308
 309 static void
 310 TftpSend(void)
 311 {
 312         uchar *pkt;
 313         volatile uchar *xp;
 314         int             len = 0;
 315         volatile ushort *s;
 316
 317 #ifdef CONFIG_MCAST_TFTP
 318         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 319         if (Multicast
 320          && (TftpState == STATE_DATA)
 321          && (MasterClient == 0))
 322                 return;
 323 #endif
 324         /*
 325          *      We will always be sending some sort of packet, so
 326          *      cobble together the packet headers now.
 327          */
 328         pkt = (uchar *)(NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE);
 329
 330         switch (TftpState) {
 331         case STATE_SEND_RRQ:
 332         case STATE_SEND_WRQ:
 333                 xp = pkt;
 334                 s = (ushort *)pkt;
 335                 *s++ = htons(TftpState == STATE_SEND_RRQ ? TFTP_RRQ :
 336                         TFTP_WRQ);
 337                 pkt = (uchar *)s;
 338                 strcpy((char *)pkt, tftp_filename);
 339                 pkt += strlen(tftp_filename) + 1;
 340                 strcpy((char *)pkt, "octet");
 341                 pkt += 5 /*strlen("octet")*/ + 1;
 342                 strcpy((char *)pkt, "timeout");
 343                 pkt += 7 /*strlen("timeout")*/ + 1;
 344                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 345                 debug("send option \"timeout %s\"\n", (char *)pkt);
 346                 pkt += strlen((char *)pkt) + 1;
 347 #ifdef CONFIG_TFTP_TSIZE
 348                 pkt += sprintf((char *)pkt, "tsize%c%lu%c",
 349                                 0, NetBootFileXferSize, 0);
 350 #endif
 351                 /* try for more effic. blk size */
 352                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 353                                 0, TftpBlkSizeOption, 0);
 354 #ifdef CONFIG_MCAST_TFTP
 355                 /* Check all preconditions before even trying the option */
 356                 if (!ProhibitMcast
 357                  && (Bitmap = malloc(Mapsize))
 358                  && eth_get_dev()->mcast) {
 359                         free(Bitmap);
 360                         Bitmap = NULL;
 361                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 362                 }
 363 #endif /* CONFIG_MCAST_TFTP */
 364                 len = pkt - xp;
 365                 break;
 366
 367         case STATE_OACK:
 368 #ifdef CONFIG_MCAST_TFTP
 369                 /* My turn!  Start at where I need blocks I missed.*/
 370                 if (Multicast)
 371                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 372                                                             (Mapsize*8), 0);
 373                 /*..falling..*/
 374 #endif
 375
 376         case STATE_RECV_WRQ:
 377         case STATE_DATA:
 378                 xp = pkt;
 379                 s = (ushort *)pkt;
 380                 s[0] = htons(TFTP_ACK);
 381                 s[1] = htons(TftpBlock);
 382                 pkt = (uchar *)(s + 2);
 383 #ifdef CONFIG_CMD_TFTPPUT
 384                 if (TftpWriting) {
 385                         int toload = TftpBlkSize;
 386                         int loaded = load_block(TftpBlock, pkt, toload);
 387
 388                         s[0] = htons(TFTP_DATA);
 389                         pkt += loaded;
 390                         TftpFinalBlock = (loaded < toload);
 391                 }
 392 #endif
 393                 len = pkt - xp;
 394                 break;
 395
 396         case STATE_TOO_LARGE:
 397                 xp = pkt;
 398                 s = (ushort *)pkt;
 399                 *s++ = htons(TFTP_ERROR);
 400                         *s++ = htons(3);
 401
 402                 pkt = (uchar *)s;
 403                 strcpy((char *)pkt, "File too large");
 404                 pkt += 14 /*strlen("File too large")*/ + 1;
 405                 len = pkt - xp;
 406                 break;
 407
 408         case STATE_BAD_MAGIC:
 409                 xp = pkt;
 410                 s = (ushort *)pkt;
 411                 *s++ = htons(TFTP_ERROR);
 412                 *s++ = htons(2);
 413                 pkt = (uchar *)s;
 414                 strcpy((char *)pkt, "File has bad magic");
 415                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 416                 len = pkt - xp;
 417                 break;
 418         }
 419
 420         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 421                          TftpOurPort, len);
 422 }
 423
 424 #ifdef CONFIG_CMD_TFTPPUT
 425 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 426                          IPaddr_t sip, unsigned src, uchar *pkt, unsigned len)
 427 {
 428         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 429                 /* Oh dear the other end has gone away */
 430                 restart("TFTP server died");
 431         }
 432 }
 433 #endif
 434
 435 static void
 436 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 437             unsigned len)
 438 {
 439         ushort proto;
 440         ushort *s;
 441         int i;
 442
 443         if (dest != TftpOurPort) {
 444 #ifdef CONFIG_MCAST_TFTP
 445                 if (Multicast
 446                  && (!Mcast_port || (dest != Mcast_port)))
 447 #endif
 448                         return;
 449         }
 450         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 451             TftpState != STATE_RECV_WRQ && TftpState != STATE_SEND_WRQ)
 452                 return;
 453
 454         if (len < 2)
 455                 return;
 456         len -= 2;
 457         /* warning: don't use increment (++) in ntohs() macros!! */
 458         s = (ushort *)pkt;
 459         proto = *s++;
 460         pkt = (uchar *)s;
 461         switch (ntohs(proto)) {
 462
 463         case TFTP_RRQ:
 464                 break;
 465
 466         case TFTP_ACK:
 467 #ifdef CONFIG_CMD_TFTPPUT
 468                 if (TftpWriting) {
 469                         if (TftpFinalBlock) {
 470                                 tftp_complete();
 471                         } else {
 472                                 /*
 473                                  * Move to the next block. We want our block
 474                                  * count to wrap just like the other end!
 475                                  */
 476                                 int block = ntohs(*s);
 477                                 int ack_ok = (TftpBlock == block);
 478
 479                                 TftpBlock = (unsigned short)(block + 1);
 480                                 update_block_number();
 481                                 if (ack_ok)
 482                                         TftpSend(); /* Send next data block */
 483                         }
 484                 }
 485 #endif
 486                 break;
 487
 488         default:
 489                 break;
 490
 491 #ifdef CONFIG_CMD_TFTPSRV
 492         case TFTP_WRQ:
 493                 debug("Got WRQ\n");
 494                 TftpRemoteIP = sip;
 495                 TftpRemotePort = src;
 496                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 497                 new_transfer();
 498                 TftpSend(); /* Send ACK(0) */
 499                 break;
 500 #endif
 501
 502         case TFTP_OACK:
 503                 debug("Got OACK: %s %s\n",
 504                         pkt,
 505                         pkt + strlen((char *)pkt) + 1);
 506                 TftpState = STATE_OACK;
 507                 TftpRemotePort = src;
 508                 /*
 509                  * Check for 'blksize' option.
 510                  * Careful: "i" is signed, "len" is unsigned, thus
 511                  * something like "len-8" may give a *huge* number
 512                  */
 513                 for (i = 0; i+8 < len; i++) {
 514                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 515                                 TftpBlkSize = (unsigned short)
 516                                         simple_strtoul((char *)pkt+i+8, NULL,
 517                                                        10);
 518                                 debug("Blocksize ack: %s, %d\n",
 519                                         (char *)pkt+i+8, TftpBlkSize);
 520                         }
 521 #ifdef CONFIG_TFTP_TSIZE
 522                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 523                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 524                                                            NULL, 10);
 525                                 debug("size = %s, %d\n",
 526                                          (char *)pkt+i+6, TftpTsize);
 527                         }
 528 #endif
 529                 }
 530 #ifdef CONFIG_MCAST_TFTP
 531                 parse_multicast_oack((char *)pkt, len-1);
 532                 if ((Multicast) && (!MasterClient))
 533                         TftpState = STATE_DATA; /* passive.. */
 534                 else
 535 #endif
 536 #ifdef CONFIG_CMD_TFTPPUT
 537                 if (TftpWriting) {
 538                         /* Get ready to send the first block */
 539                         TftpState = STATE_DATA;
 540                         TftpBlock++;
 541                 }
 542 #endif
 543                 TftpSend(); /* Send ACK or first data block */
 544                 break;
 545         case TFTP_DATA:
 546                 if (len < 2)
 547                         return;
 548                 len -= 2;
 549                 TftpBlock = ntohs(*(ushort *)pkt);
 550
 551                 update_block_number();
 552
 553                 if (TftpState == STATE_SEND_RRQ)
 554                         debug("Server did not acknowledge timeout option!\n");
 555
 556                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 557                     TftpState == STATE_RECV_WRQ) {
 558                         /* first block received */
 559                         TftpState = STATE_DATA;
 560                         TftpRemotePort = src;
 561                         new_transfer();
 562
 563 #ifdef CONFIG_MCAST_TFTP
 564                         if (Multicast) { /* start!=1 common if mcast */
 565                                 TftpLastBlock = TftpBlock - 1;
 566                         } else
 567 #endif
 568                         if (TftpBlock != 1) {   /* Assertion */
 569                                 printf("\nTFTP error: "
 570                                        "First block is not block 1 (%ld)\n"
 571                                        "Starting again\n\n",
 572                                         TftpBlock);
 573                                 NetStartAgain();
 574                                 break;
 575                         }
 576                 }
 577
 578                 if (TftpBlock == TftpLastBlock) {
 579                         /*
 580                          *      Same block again; ignore it.
 581                          */
 582                         break;
 583                 }
 584
 585                 TftpLastBlock = TftpBlock;
 586                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 587                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 588
 589                 store_block(TftpBlock - 1, pkt + 2, len);
 590
 591                 /*
 592                  *      Acknowledge the block just received, which will prompt
 593                  *      the remote for the next one.
 594                  */
 595 #ifdef CONFIG_MCAST_TFTP
 596                 /* if I am the MasterClient, actively calculate what my next
 597                  * needed block is; else I'm passive; not ACKING
 598                  */
 599                 if (Multicast) {
 600                         if (len < TftpBlkSize)  {
 601                                 TftpEndingBlock = TftpBlock;
 602                         } else if (MasterClient) {
 603                                 TftpBlock = PrevBitmapHole =
 604                                         ext2_find_next_zero_bit(
 605                                                 Bitmap,
 606                                                 (Mapsize*8),
 607                                                 PrevBitmapHole);
 608                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 609                                         printf("tftpfile too big\n");
 610                                         /* try to double it and retry */
 611                                         Mapsize <<= 1;
 612                                         mcast_cleanup();
 613                                         NetStartAgain();
 614                                         return;
 615                                 }
 616                                 TftpLastBlock = TftpBlock;
 617                         }
 618                 }
 619 #endif
 620                 TftpSend();
 621
 622 #ifdef CONFIG_MCAST_TFTP
 623                 if (Multicast) {
 624                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 625                                 puts("\nMulticast tftp done\n");
 626                                 mcast_cleanup();
 627                                 NetState = NETLOOP_SUCCESS;
 628                         }
 629                 }
 630                 else
 631 #endif
 632                 if (len < TftpBlkSize)
 633                         tftp_complete();
 634                 break;
 635
 636         case TFTP_ERROR:
 637                 printf("\nTFTP error: '%s' (%d)\n",
 638                        pkt + 2, ntohs(*(ushort *)pkt));
 639
 640                 switch (ntohs(*(ushort *)pkt)) {
 641                 case TFTP_ERR_FILE_NOT_FOUND:
 642                 case TFTP_ERR_ACCESS_DENIED:
 643                         puts("Not retrying...\n");
 644                         eth_halt();
 645                         NetState = NETLOOP_FAIL;
 646                         break;
 647                 case TFTP_ERR_UNDEFINED:
 648                 case TFTP_ERR_DISK_FULL:
 649                 case TFTP_ERR_UNEXPECTED_OPCODE:
 650                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 651                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 652                 default:
 653                         puts("Starting again\n\n");
 654 #ifdef CONFIG_MCAST_TFTP
 655                         mcast_cleanup();
 656 #endif
 657                         NetStartAgain();
 658                         break;
 659                 }
 660                 break;
 661         }
 662 }
 663
 664
 665 static void
 666 TftpTimeout(void)
 667 {
 668         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 669                 restart("Retry count exceeded");
 670         } else {
 671                 puts("T ");
 672                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 673                 if (TftpState != STATE_RECV_WRQ)
 674                         TftpSend();
 675         }
 676 }
 677
 678
 679 void TftpStart(enum proto_t protocol)
 680 {
 681         char *ep;             /* Environment pointer */
 682
 683         /*
 684          * Allow the user to choose TFTP blocksize and timeout.
 685          * TFTP protocol has a minimal timeout of 1 second.
 686          */
 687         ep = getenv("tftpblocksize");
 688         if (ep != NULL)
 689                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 690
 691         ep = getenv("tftptimeout");
 692         if (ep != NULL)
 693                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 694
 695         if (TftpTimeoutMSecs < 1000) {
 696                 printf("TFTP timeout (%ld ms) too low, "
 697                         "set minimum = 1000 ms\n",
 698                         TftpTimeoutMSecs);
 699                 TftpTimeoutMSecs = 1000;
 700         }
 701
 702         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 703                 TftpBlkSizeOption, TftpTimeoutMSecs);
 704
 705         TftpRemoteIP = NetServerIP;
 706         if (BootFile[0] == '\0') {
 707                 sprintf(default_filename, "%02lX%02lX%02lX%02lX.img",
 708                         NetOurIP & 0xFF,
 709                         (NetOurIP >>  8) & 0xFF,
 710                         (NetOurIP >> 16) & 0xFF,
 711                         (NetOurIP >> 24) & 0xFF);
 712
 713                 strncpy(tftp_filename, default_filename, MAX_LEN);
 714                 tftp_filename[MAX_LEN-1] = 0;
 715
 716                 printf("*** Warning: no boot file name; using '%s'\n",
 717                         tftp_filename);
 718         } else {
 719                 char *p = strchr(BootFile, ':');
 720
 721                 if (p == NULL) {
 722                         strncpy(tftp_filename, BootFile, MAX_LEN);
 723                         tftp_filename[MAX_LEN-1] = 0;
 724                 } else {
 725                         TftpRemoteIP = string_to_ip(BootFile);
 726                         strncpy(tftp_filename, p + 1, MAX_LEN);
 727                         tftp_filename[MAX_LEN-1] = 0;
 728                 }
 729         }
 730
 731         printf("Using %s device\n", eth_get_name());
 732         printf("TFTP %s server %pI4; our IP address is %pI4",
 733                protocol == TFTPPUT ? "to" : "from", &TftpRemoteIP, &NetOurIP);
 734
 735         /* Check if we need to send across this subnet */
 736         if (NetOurGatewayIP && NetOurSubnetMask) {
 737                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 738                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 739
 740                 if (OurNet != RemoteNet)
 741                         printf("; sending through gateway %pI4",
 742                                &NetOurGatewayIP);
 743         }
 744         putc('\n');
 745
 746         printf("Filename '%s'.", tftp_filename);
 747
 748         if (NetBootFileSize) {
 749                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 750                 print_size(NetBootFileSize<<9, "");
 751         }
 752
 753         putc('\n');
 754 #ifdef CONFIG_CMD_TFTPPUT
 755         TftpWriting = (protocol == TFTPPUT);
 756         if (TftpWriting) {
 757                 printf("Save address: 0x%lx\n", save_addr);
 758                 printf("Save size:    0x%lx\n", save_size);
 759                 NetBootFileXferSize = save_size;
 760                 puts("Saving: *\b");
 761                 TftpState = STATE_SEND_WRQ;
 762                 new_transfer();
 763         } else
 764 #endif
 765         {
 766                 printf("Load address: 0x%lx\n", load_addr);
 767                 puts("Loading: *\b");
 768                 TftpState = STATE_SEND_RRQ;
 769         }
 770
 771         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 772
 773         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 774         NetSetHandler(TftpHandler);
 775 #ifdef CONFIG_CMD_TFTPPUT
 776         net_set_icmp_handler(icmp_handler);
 777 #endif
 778         TftpRemotePort = WELL_KNOWN_PORT;
 779         TftpTimeoutCount = 0;
 780         /* Use a pseudo-random port unless a specific port is set */
 781         TftpOurPort = 1024 + (get_timer(0) % 3072);
 782
 783 #ifdef CONFIG_TFTP_PORT
 784         ep = getenv("tftpdstp");
 785         if (ep != NULL)
 786                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 787         ep = getenv("tftpsrcp");
 788         if (ep != NULL)
 789                 TftpOurPort = simple_strtol(ep, NULL, 10);
 790 #endif
 791         TftpBlock = 0;
 792
 793         /* zero out server ether in case the server ip has changed */
 794         memset(NetServerEther, 0, 6);
 795         /* Revert TftpBlkSize to dflt */
 796         TftpBlkSize = TFTP_BLOCK_SIZE;
 797 #ifdef CONFIG_MCAST_TFTP
 798         mcast_cleanup();
 799 #endif
 800 #ifdef CONFIG_TFTP_TSIZE
 801         TftpTsize = 0;
 802         TftpNumchars = 0;
 803 #endif
 804
 805         TftpSend();
 806 }
 807
 808 #ifdef CONFIG_CMD_TFTPSRV
 809 void
 810 TftpStartServer(void)
 811 {
 812         tftp_filename[0] = 0;
 813
 814         printf("Using %s device\n", eth_get_name());
 815         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 816         printf("Load address: 0x%lx\n", load_addr);
 817
 818         puts("Loading: *\b");
 819
 820         TftpTimeoutCountMax = TIMEOUT_COUNT;
 821         TftpTimeoutCount = 0;
 822         TftpTimeoutMSecs = TIMEOUT;
 823         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 824
 825         /* Revert TftpBlkSize to dflt */
 826         TftpBlkSize = TFTP_BLOCK_SIZE;
 827         TftpBlock = 0;
 828         TftpOurPort = WELL_KNOWN_PORT;
 829
 830 #ifdef CONFIG_TFTP_TSIZE
 831         TftpTsize = 0;
 832         TftpNumchars = 0;
 833 #endif
 834
 835         TftpState = STATE_RECV_WRQ;
 836         NetSetHandler(TftpHandler);
 837 }
 838 #endif /* CONFIG_CMD_TFTPSRV */
 839
 840 #ifdef CONFIG_MCAST_TFTP
 841 /* Credits: atftp project.
 842  */
 843
 844 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 845  * Frame:
 846  *    +-------+-----------+---+-------~~-------+---+
 847  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 848  *    +-------+-----------+---+-------~~-------+---+
 849  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 850  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 851  * master-client, I'm a passive client, gathering what DataBlocks I may and
 852  * making note of which ones I got in my bitmask.
 853  * In theory, I never go from master->passive..
 854  * .. this comes in with pkt already pointing just past opc
 855  */
 856 static void parse_multicast_oack(char *pkt, int len)
 857 {
 858         int i;
 859         IPaddr_t addr;
 860         char *mc_adr, *port,  *mc;
 861
 862         mc_adr = port = mc = NULL;
 863         /* march along looking for 'multicast\0', which has to start at least
 864          * 14 bytes back from the end.
 865          */
 866         for (i = 0; i < len-14; i++)
 867                 if (strcmp(pkt+i, "multicast") == 0)
 868                         break;
 869         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 870                 return;
 871
 872         i += 10; /* strlen multicast */
 873         mc_adr = pkt+i;
 874         for (; i < len; i++) {
 875                 if (*(pkt+i) == ',') {
 876                         *(pkt+i) = '\0';
 877                         if (port) {
 878                                 mc = pkt+i+1;
 879                                 break;
 880                         } else {
 881                                 port = pkt+i+1;
 882                         }
 883                 }
 884         }
 885         if (!port || !mc_adr || !mc)
 886                 return;
 887         if (Multicast && MasterClient) {
 888                 printf("I got a OACK as master Client, WRONG!\n");
 889                 return;
 890         }
 891         /* ..I now accept packets destined for this MCAST addr, port */
 892         if (!Multicast) {
 893                 if (Bitmap) {
 894                         printf("Internal failure! no mcast.\n");
 895                         free(Bitmap);
 896                         Bitmap = NULL;
 897                         ProhibitMcast = 1;
 898                         return ;
 899                 }
 900                 /* I malloc instead of pre-declare; so that if the file ends
 901                  * up being too big for this bitmap I can retry
 902                  */
 903                 Bitmap = malloc(Mapsize);
 904                 if (!Bitmap) {
 905                         printf("No Bitmap, no multicast. Sorry.\n");
 906                         ProhibitMcast = 1;
 907                         return;
 908                 }
 909                 memset(Bitmap, 0, Mapsize);
 910                 PrevBitmapHole = 0;
 911                 Multicast = 1;
 912         }
 913         addr = string_to_ip(mc_adr);
 914         if (Mcast_addr != addr) {
 915                 if (Mcast_addr)
 916                         eth_mcast_join(Mcast_addr, 0);
 917                 Mcast_addr = addr;
 918                 if (eth_mcast_join(Mcast_addr, 1)) {
 919                         printf("Fail to set mcast, revert to TFTP\n");
 920                         ProhibitMcast = 1;
 921                         mcast_cleanup();
 922                         NetStartAgain();
 923                 }
 924         }
 925         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 926         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 927         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 928         return;
 929 }
 930
 931 #endif /* Multicast TFTP */