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 #ifdef CONFIG_CMD_TFTPPUT
 336                 *s++ = htons(TftpState == STATE_SEND_RRQ ? TFTP_RRQ :
 337                         TFTP_WRQ);
 338 #else
 339                 *s++ = htons(TFTP_RRQ);
 340 #endif
 341                 pkt = (uchar *)s;
 342                 strcpy((char *)pkt, tftp_filename);
 343                 pkt += strlen(tftp_filename) + 1;
 344                 strcpy((char *)pkt, "octet");
 345                 pkt += 5 /*strlen("octet")*/ + 1;
 346                 strcpy((char *)pkt, "timeout");
 347                 pkt += 7 /*strlen("timeout")*/ + 1;
 348                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 349                 debug("send option \"timeout %s\"\n", (char *)pkt);
 350                 pkt += strlen((char *)pkt) + 1;
 351 #ifdef CONFIG_TFTP_TSIZE
 352                 pkt += sprintf((char *)pkt, "tsize%c%lu%c",
 353                                 0, NetBootFileXferSize, 0);
 354 #endif
 355                 /* try for more effic. blk size */
 356                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 357                                 0, TftpBlkSizeOption, 0);
 358 #ifdef CONFIG_MCAST_TFTP
 359                 /* Check all preconditions before even trying the option */
 360                 if (!ProhibitMcast
 361                  && (Bitmap = malloc(Mapsize))
 362                  && eth_get_dev()->mcast) {
 363                         free(Bitmap);
 364                         Bitmap = NULL;
 365                         pkt += sprintf((char *)pkt, "multicast%c%c", 0, 0);
 366                 }
 367 #endif /* CONFIG_MCAST_TFTP */
 368                 len = pkt - xp;
 369                 break;
 370
 371         case STATE_OACK:
 372 #ifdef CONFIG_MCAST_TFTP
 373                 /* My turn!  Start at where I need blocks I missed.*/
 374                 if (Multicast)
 375                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 376                                                             (Mapsize*8), 0);
 377                 /*..falling..*/
 378 #endif
 379
 380         case STATE_RECV_WRQ:
 381         case STATE_DATA:
 382                 xp = pkt;
 383                 s = (ushort *)pkt;
 384                 s[0] = htons(TFTP_ACK);
 385                 s[1] = htons(TftpBlock);
 386                 pkt = (uchar *)(s + 2);
 387 #ifdef CONFIG_CMD_TFTPPUT
 388                 if (TftpWriting) {
 389                         int toload = TftpBlkSize;
 390                         int loaded = load_block(TftpBlock, pkt, toload);
 391
 392                         s[0] = htons(TFTP_DATA);
 393                         pkt += loaded;
 394                         TftpFinalBlock = (loaded < toload);
 395                 }
 396 #endif
 397                 len = pkt - xp;
 398                 break;
 399
 400         case STATE_TOO_LARGE:
 401                 xp = pkt;
 402                 s = (ushort *)pkt;
 403                 *s++ = htons(TFTP_ERROR);
 404                         *s++ = htons(3);
 405
 406                 pkt = (uchar *)s;
 407                 strcpy((char *)pkt, "File too large");
 408                 pkt += 14 /*strlen("File too large")*/ + 1;
 409                 len = pkt - xp;
 410                 break;
 411
 412         case STATE_BAD_MAGIC:
 413                 xp = pkt;
 414                 s = (ushort *)pkt;
 415                 *s++ = htons(TFTP_ERROR);
 416                 *s++ = htons(2);
 417                 pkt = (uchar *)s;
 418                 strcpy((char *)pkt, "File has bad magic");
 419                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 420                 len = pkt - xp;
 421                 break;
 422         }
 423
 424         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 425                          TftpOurPort, len);
 426 }
 427
 428 #ifdef CONFIG_CMD_TFTPPUT
 429 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 430                          IPaddr_t sip, unsigned src, uchar *pkt, unsigned len)
 431 {
 432         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 433                 /* Oh dear the other end has gone away */
 434                 restart("TFTP server died");
 435         }
 436 }
 437 #endif
 438
 439 static void
 440 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 441             unsigned len)
 442 {
 443         ushort proto;
 444         ushort *s;
 445         int i;
 446
 447         if (dest != TftpOurPort) {
 448 #ifdef CONFIG_MCAST_TFTP
 449                 if (Multicast
 450                  && (!Mcast_port || (dest != Mcast_port)))
 451 #endif
 452                         return;
 453         }
 454         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 455             TftpState != STATE_RECV_WRQ && TftpState != STATE_SEND_WRQ)
 456                 return;
 457
 458         if (len < 2)
 459                 return;
 460         len -= 2;
 461         /* warning: don't use increment (++) in ntohs() macros!! */
 462         s = (ushort *)pkt;
 463         proto = *s++;
 464         pkt = (uchar *)s;
 465         switch (ntohs(proto)) {
 466
 467         case TFTP_RRQ:
 468                 break;
 469
 470         case TFTP_ACK:
 471 #ifdef CONFIG_CMD_TFTPPUT
 472                 if (TftpWriting) {
 473                         if (TftpFinalBlock) {
 474                                 tftp_complete();
 475                         } else {
 476                                 /*
 477                                  * Move to the next block. We want our block
 478                                  * count to wrap just like the other end!
 479                                  */
 480                                 int block = ntohs(*s);
 481                                 int ack_ok = (TftpBlock == block);
 482
 483                                 TftpBlock = (unsigned short)(block + 1);
 484                                 update_block_number();
 485                                 if (ack_ok)
 486                                         TftpSend(); /* Send next data block */
 487                         }
 488                 }
 489 #endif
 490                 break;
 491
 492         default:
 493                 break;
 494
 495 #ifdef CONFIG_CMD_TFTPSRV
 496         case TFTP_WRQ:
 497                 debug("Got WRQ\n");
 498                 TftpRemoteIP = sip;
 499                 TftpRemotePort = src;
 500                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 501                 new_transfer();
 502                 TftpSend(); /* Send ACK(0) */
 503                 break;
 504 #endif
 505
 506         case TFTP_OACK:
 507                 debug("Got OACK: %s %s\n",
 508                         pkt,
 509                         pkt + strlen((char *)pkt) + 1);
 510                 TftpState = STATE_OACK;
 511                 TftpRemotePort = src;
 512                 /*
 513                  * Check for 'blksize' option.
 514                  * Careful: "i" is signed, "len" is unsigned, thus
 515                  * something like "len-8" may give a *huge* number
 516                  */
 517                 for (i = 0; i+8 < len; i++) {
 518                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 519                                 TftpBlkSize = (unsigned short)
 520                                         simple_strtoul((char *)pkt+i+8, NULL,
 521                                                        10);
 522                                 debug("Blocksize ack: %s, %d\n",
 523                                         (char *)pkt+i+8, TftpBlkSize);
 524                         }
 525 #ifdef CONFIG_TFTP_TSIZE
 526                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 527                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 528                                                            NULL, 10);
 529                                 debug("size = %s, %d\n",
 530                                          (char *)pkt+i+6, TftpTsize);
 531                         }
 532 #endif
 533                 }
 534 #ifdef CONFIG_MCAST_TFTP
 535                 parse_multicast_oack((char *)pkt, len-1);
 536                 if ((Multicast) && (!MasterClient))
 537                         TftpState = STATE_DATA; /* passive.. */
 538                 else
 539 #endif
 540 #ifdef CONFIG_CMD_TFTPPUT
 541                 if (TftpWriting) {
 542                         /* Get ready to send the first block */
 543                         TftpState = STATE_DATA;
 544                         TftpBlock++;
 545                 }
 546 #endif
 547                 TftpSend(); /* Send ACK or first data block */
 548                 break;
 549         case TFTP_DATA:
 550                 if (len < 2)
 551                         return;
 552                 len -= 2;
 553                 TftpBlock = ntohs(*(ushort *)pkt);
 554
 555                 update_block_number();
 556
 557                 if (TftpState == STATE_SEND_RRQ)
 558                         debug("Server did not acknowledge timeout option!\n");
 559
 560                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 561                     TftpState == STATE_RECV_WRQ) {
 562                         /* first block received */
 563                         TftpState = STATE_DATA;
 564                         TftpRemotePort = src;
 565                         new_transfer();
 566
 567 #ifdef CONFIG_MCAST_TFTP
 568                         if (Multicast) { /* start!=1 common if mcast */
 569                                 TftpLastBlock = TftpBlock - 1;
 570                         } else
 571 #endif
 572                         if (TftpBlock != 1) {   /* Assertion */
 573                                 printf("\nTFTP error: "
 574                                        "First block is not block 1 (%ld)\n"
 575                                        "Starting again\n\n",
 576                                         TftpBlock);
 577                                 NetStartAgain();
 578                                 break;
 579                         }
 580                 }
 581
 582                 if (TftpBlock == TftpLastBlock) {
 583                         /*
 584                          *      Same block again; ignore it.
 585                          */
 586                         break;
 587                 }
 588
 589                 TftpLastBlock = TftpBlock;
 590                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 591                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 592
 593                 store_block(TftpBlock - 1, pkt + 2, len);
 594
 595                 /*
 596                  *      Acknowledge the block just received, which will prompt
 597                  *      the remote for the next one.
 598                  */
 599 #ifdef CONFIG_MCAST_TFTP
 600                 /* if I am the MasterClient, actively calculate what my next
 601                  * needed block is; else I'm passive; not ACKING
 602                  */
 603                 if (Multicast) {
 604                         if (len < TftpBlkSize)  {
 605                                 TftpEndingBlock = TftpBlock;
 606                         } else if (MasterClient) {
 607                                 TftpBlock = PrevBitmapHole =
 608                                         ext2_find_next_zero_bit(
 609                                                 Bitmap,
 610                                                 (Mapsize*8),
 611                                                 PrevBitmapHole);
 612                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 613                                         printf("tftpfile too big\n");
 614                                         /* try to double it and retry */
 615                                         Mapsize <<= 1;
 616                                         mcast_cleanup();
 617                                         NetStartAgain();
 618                                         return;
 619                                 }
 620                                 TftpLastBlock = TftpBlock;
 621                         }
 622                 }
 623 #endif
 624                 TftpSend();
 625
 626 #ifdef CONFIG_MCAST_TFTP
 627                 if (Multicast) {
 628                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 629                                 puts("\nMulticast tftp done\n");
 630                                 mcast_cleanup();
 631                                 NetState = NETLOOP_SUCCESS;
 632                         }
 633                 }
 634                 else
 635 #endif
 636                 if (len < TftpBlkSize)
 637                         tftp_complete();
 638                 break;
 639
 640         case TFTP_ERROR:
 641                 printf("\nTFTP error: '%s' (%d)\n",
 642                        pkt + 2, ntohs(*(ushort *)pkt));
 643
 644                 switch (ntohs(*(ushort *)pkt)) {
 645                 case TFTP_ERR_FILE_NOT_FOUND:
 646                 case TFTP_ERR_ACCESS_DENIED:
 647                         puts("Not retrying...\n");
 648                         eth_halt();
 649                         NetState = NETLOOP_FAIL;
 650                         break;
 651                 case TFTP_ERR_UNDEFINED:
 652                 case TFTP_ERR_DISK_FULL:
 653                 case TFTP_ERR_UNEXPECTED_OPCODE:
 654                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 655                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 656                 default:
 657                         puts("Starting again\n\n");
 658 #ifdef CONFIG_MCAST_TFTP
 659                         mcast_cleanup();
 660 #endif
 661                         NetStartAgain();
 662                         break;
 663                 }
 664                 break;
 665         }
 666 }
 667
 668
 669 static void
 670 TftpTimeout(void)
 671 {
 672         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 673                 restart("Retry count exceeded");
 674         } else {
 675                 puts("T ");
 676                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 677                 if (TftpState != STATE_RECV_WRQ)
 678                         TftpSend();
 679         }
 680 }
 681
 682
 683 void TftpStart(enum proto_t protocol)
 684 {
 685         char *ep;             /* Environment pointer */
 686
 687         /*
 688          * Allow the user to choose TFTP blocksize and timeout.
 689          * TFTP protocol has a minimal timeout of 1 second.
 690          */
 691         ep = getenv("tftpblocksize");
 692         if (ep != NULL)
 693                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 694
 695         ep = getenv("tftptimeout");
 696         if (ep != NULL)
 697                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 698
 699         if (TftpTimeoutMSecs < 1000) {
 700                 printf("TFTP timeout (%ld ms) too low, "
 701                         "set minimum = 1000 ms\n",
 702                         TftpTimeoutMSecs);
 703                 TftpTimeoutMSecs = 1000;
 704         }
 705
 706         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 707                 TftpBlkSizeOption, TftpTimeoutMSecs);
 708
 709         TftpRemoteIP = NetServerIP;
 710         if (BootFile[0] == '\0') {
 711                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 712                         NetOurIP & 0xFF,
 713                         (NetOurIP >>  8) & 0xFF,
 714                         (NetOurIP >> 16) & 0xFF,
 715                         (NetOurIP >> 24) & 0xFF);
 716
 717                 strncpy(tftp_filename, default_filename, MAX_LEN);
 718                 tftp_filename[MAX_LEN-1] = 0;
 719
 720                 printf("*** Warning: no boot file name; using '%s'\n",
 721                         tftp_filename);
 722         } else {
 723                 char *p = strchr(BootFile, ':');
 724
 725                 if (p == NULL) {
 726                         strncpy(tftp_filename, BootFile, MAX_LEN);
 727                         tftp_filename[MAX_LEN-1] = 0;
 728                 } else {
 729                         TftpRemoteIP = string_to_ip(BootFile);
 730                         strncpy(tftp_filename, p + 1, MAX_LEN);
 731                         tftp_filename[MAX_LEN-1] = 0;
 732                 }
 733         }
 734
 735         printf("Using %s device\n", eth_get_name());
 736         printf("TFTP %s server %pI4; our IP address is %pI4",
 737 #ifdef CONFIG_CMD_TFTPPUT
 738                protocol == TFTPPUT ? "to" : "from",
 739 #else
 740                 "from",
 741 #endif
 742                 &TftpRemoteIP, &NetOurIP);
 743
 744         /* Check if we need to send across this subnet */
 745         if (NetOurGatewayIP && NetOurSubnetMask) {
 746                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 747                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 748
 749                 if (OurNet != RemoteNet)
 750                         printf("; sending through gateway %pI4",
 751                                &NetOurGatewayIP);
 752         }
 753         putc('\n');
 754
 755         printf("Filename '%s'.", tftp_filename);
 756
 757         if (NetBootFileSize) {
 758                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 759                 print_size(NetBootFileSize<<9, "");
 760         }
 761
 762         putc('\n');
 763 #ifdef CONFIG_CMD_TFTPPUT
 764         TftpWriting = (protocol == TFTPPUT);
 765         if (TftpWriting) {
 766                 printf("Save address: 0x%lx\n", save_addr);
 767                 printf("Save size:    0x%lx\n", save_size);
 768                 NetBootFileXferSize = save_size;
 769                 puts("Saving: *\b");
 770                 TftpState = STATE_SEND_WRQ;
 771                 new_transfer();
 772         } else
 773 #endif
 774         {
 775                 printf("Load address: 0x%lx\n", load_addr);
 776                 puts("Loading: *\b");
 777                 TftpState = STATE_SEND_RRQ;
 778         }
 779
 780         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 781
 782         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 783         NetSetHandler(TftpHandler);
 784 #ifdef CONFIG_CMD_TFTPPUT
 785         net_set_icmp_handler(icmp_handler);
 786 #endif
 787         TftpRemotePort = WELL_KNOWN_PORT;
 788         TftpTimeoutCount = 0;
 789         /* Use a pseudo-random port unless a specific port is set */
 790         TftpOurPort = 1024 + (get_timer(0) % 3072);
 791
 792 #ifdef CONFIG_TFTP_PORT
 793         ep = getenv("tftpdstp");
 794         if (ep != NULL)
 795                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 796         ep = getenv("tftpsrcp");
 797         if (ep != NULL)
 798                 TftpOurPort = simple_strtol(ep, NULL, 10);
 799 #endif
 800         TftpBlock = 0;
 801
 802         /* zero out server ether in case the server ip has changed */
 803         memset(NetServerEther, 0, 6);
 804         /* Revert TftpBlkSize to dflt */
 805         TftpBlkSize = TFTP_BLOCK_SIZE;
 806 #ifdef CONFIG_MCAST_TFTP
 807         mcast_cleanup();
 808 #endif
 809 #ifdef CONFIG_TFTP_TSIZE
 810         TftpTsize = 0;
 811         TftpNumchars = 0;
 812 #endif
 813
 814         TftpSend();
 815 }
 816
 817 #ifdef CONFIG_CMD_TFTPSRV
 818 void
 819 TftpStartServer(void)
 820 {
 821         tftp_filename[0] = 0;
 822
 823         printf("Using %s device\n", eth_get_name());
 824         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 825         printf("Load address: 0x%lx\n", load_addr);
 826
 827         puts("Loading: *\b");
 828
 829         TftpTimeoutCountMax = TIMEOUT_COUNT;
 830         TftpTimeoutCount = 0;
 831         TftpTimeoutMSecs = TIMEOUT;
 832         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 833
 834         /* Revert TftpBlkSize to dflt */
 835         TftpBlkSize = TFTP_BLOCK_SIZE;
 836         TftpBlock = 0;
 837         TftpOurPort = WELL_KNOWN_PORT;
 838
 839 #ifdef CONFIG_TFTP_TSIZE
 840         TftpTsize = 0;
 841         TftpNumchars = 0;
 842 #endif
 843
 844         TftpState = STATE_RECV_WRQ;
 845         NetSetHandler(TftpHandler);
 846 }
 847 #endif /* CONFIG_CMD_TFTPSRV */
 848
 849 #ifdef CONFIG_MCAST_TFTP
 850 /* Credits: atftp project.
 851  */
 852
 853 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 854  * Frame:
 855  *    +-------+-----------+---+-------~~-------+---+
 856  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 857  *    +-------+-----------+---+-------~~-------+---+
 858  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 859  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 860  * master-client, I'm a passive client, gathering what DataBlocks I may and
 861  * making note of which ones I got in my bitmask.
 862  * In theory, I never go from master->passive..
 863  * .. this comes in with pkt already pointing just past opc
 864  */
 865 static void parse_multicast_oack(char *pkt, int len)
 866 {
 867         int i;
 868         IPaddr_t addr;
 869         char *mc_adr, *port,  *mc;
 870
 871         mc_adr = port = mc = NULL;
 872         /* march along looking for 'multicast\0', which has to start at least
 873          * 14 bytes back from the end.
 874          */
 875         for (i = 0; i < len-14; i++)
 876                 if (strcmp(pkt+i, "multicast") == 0)
 877                         break;
 878         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 879                 return;
 880
 881         i += 10; /* strlen multicast */
 882         mc_adr = pkt+i;
 883         for (; i < len; i++) {
 884                 if (*(pkt+i) == ',') {
 885                         *(pkt+i) = '\0';
 886                         if (port) {
 887                                 mc = pkt+i+1;
 888                                 break;
 889                         } else {
 890                                 port = pkt+i+1;
 891                         }
 892                 }
 893         }
 894         if (!port || !mc_adr || !mc)
 895                 return;
 896         if (Multicast && MasterClient) {
 897                 printf("I got a OACK as master Client, WRONG!\n");
 898                 return;
 899         }
 900         /* ..I now accept packets destined for this MCAST addr, port */
 901         if (!Multicast) {
 902                 if (Bitmap) {
 903                         printf("Internal failure! no mcast.\n");
 904                         free(Bitmap);
 905                         Bitmap = NULL;
 906                         ProhibitMcast = 1;
 907                         return ;
 908                 }
 909                 /* I malloc instead of pre-declare; so that if the file ends
 910                  * up being too big for this bitmap I can retry
 911                  */
 912                 Bitmap = malloc(Mapsize);
 913                 if (!Bitmap) {
 914                         printf("No Bitmap, no multicast. Sorry.\n");
 915                         ProhibitMcast = 1;
 916                         return;
 917                 }
 918                 memset(Bitmap, 0, Mapsize);
 919                 PrevBitmapHole = 0;
 920                 Multicast = 1;
 921         }
 922         addr = string_to_ip(mc_adr);
 923         if (Mcast_addr != addr) {
 924                 if (Mcast_addr)
 925                         eth_mcast_join(Mcast_addr, 0);
 926                 Mcast_addr = addr;
 927                 if (eth_mcast_join(Mcast_addr, 1)) {
 928                         printf("Fail to set mcast, revert to TFTP\n");
 929                         ProhibitMcast = 1;
 930                         mcast_cleanup();
 931                         NetStartAgain();
 932                 }
 933         }
 934         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 935         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 936         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 937         return;
 938 }
 939
 940 #endif /* Multicast TFTP */