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 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
  15 #include <flash.h>
  16 #endif
  17
  18 /* Well known TFTP port # */
  19 #define WELL_KNOWN_PORT 69
  20 /* Millisecs to timeout for lost pkt */
  21 #define TIMEOUT         5000UL
  22 #ifndef CONFIG_NET_RETRY_COUNT
  23 /* # of timeouts before giving up */
  24 # define TIMEOUT_COUNT  10
  25 #else
  26 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  27 #endif
  28 /* Number of "loading" hashes per line (for checking the image size) */
  29 #define HASHES_PER_LINE 65
  30
  31 /*
  32  *      TFTP operations.
  33  */
  34 #define TFTP_RRQ        1
  35 #define TFTP_WRQ        2
  36 #define TFTP_DATA       3
  37 #define TFTP_ACK        4
  38 #define TFTP_ERROR      5
  39 #define TFTP_OACK       6
  40
  41 static ulong TftpTimeoutMSecs = TIMEOUT;
  42 static int TftpTimeoutCountMax = TIMEOUT_COUNT;
  43 static ulong time_start;   /* Record time we started tftp */
  44
  45 /*
  46  * These globals govern the timeout behavior when attempting a connection to a
  47  * TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
  48  * wait for the server to respond to initial connection. Second global,
  49  * TftpRRQTimeoutCountMax, gives the number of such connection retries.
  50  * TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
  51  * positive. The globals are meant to be set (and restored) by code needing
  52  * non-standard timeout behavior when initiating a TFTP transfer.
  53  */
  54 ulong TftpRRQTimeoutMSecs = TIMEOUT;
  55 int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
  56
  57 enum {
  58         TFTP_ERR_UNDEFINED           = 0,
  59         TFTP_ERR_FILE_NOT_FOUND      = 1,
  60         TFTP_ERR_ACCESS_DENIED       = 2,
  61         TFTP_ERR_DISK_FULL           = 3,
  62         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  63         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  64         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  65 };
  66
  67 static IPaddr_t TftpRemoteIP;
  68 /* The UDP port at their end */
  69 static int      TftpRemotePort;
  70 /* The UDP port at our end */
  71 static int      TftpOurPort;
  72 static int      TftpTimeoutCount;
  73 /* packet sequence number */
  74 static ulong    TftpBlock;
  75 /* last packet sequence number received */
  76 static ulong    TftpLastBlock;
  77 /* count of sequence number wraparounds */
  78 static ulong    TftpBlockWrap;
  79 /* memory offset due to wrapping */
  80 static ulong    TftpBlockWrapOffset;
  81 static int      TftpState;
  82 #ifdef CONFIG_TFTP_TSIZE
  83 /* The file size reported by the server */
  84 static int      TftpTsize;
  85 /* The number of hashes we printed */
  86 static short    TftpNumchars;
  87 #endif
  88 #ifdef CONFIG_CMD_TFTPPUT
  89 static int      TftpWriting;    /* 1 if writing, else 0 */
  90 static int      TftpFinalBlock; /* 1 if we have sent the last block */
  91 #else
  92 #define TftpWriting     0
  93 #endif
  94
  95 #define STATE_SEND_RRQ  1
  96 #define STATE_DATA      2
  97 #define STATE_TOO_LARGE 3
  98 #define STATE_BAD_MAGIC 4
  99 #define STATE_OACK      5
 100 #define STATE_RECV_WRQ  6
 101 #define STATE_SEND_WRQ  7
 102
 103 /* default TFTP block size */
 104 #define TFTP_BLOCK_SIZE         512
 105 /* sequence number is 16 bit */
 106 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 107
 108 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 109 static char default_filename[DEFAULT_NAME_LEN];
 110
 111 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 112 #define MAX_LEN 128
 113 #else
 114 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 115 #endif
 116
 117 static char tftp_filename[MAX_LEN];
 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 static int Mcast_port;
 141 static ulong TftpEndingBlock; /* can get 'last' block before done..*/
 142
 143 static void parse_multicast_oack(char *pkt, int len);
 144
 145 static void
 146 mcast_cleanup(void)
 147 {
 148         if (Mcast_addr)
 149                 eth_mcast_join(Mcast_addr, 0);
 150         if (Bitmap)
 151                 free(Bitmap);
 152         Bitmap = NULL;
 153         Mcast_addr = Multicast = Mcast_port = 0;
 154         TftpEndingBlock = -1;
 155 }
 156
 157 #endif  /* CONFIG_MCAST_TFTP */
 158
 159 static inline void
 160 store_block(int block, uchar *src, unsigned len)
 161 {
 162         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 163         ulong newsize = offset + len;
 164 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 165         int i, rc = 0;
 166
 167         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 168                 /* start address in flash? */
 169                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 170                         continue;
 171                 if (load_addr + offset >= flash_info[i].start[0]) {
 172                         rc = 1;
 173                         break;
 174                 }
 175         }
 176
 177         if (rc) { /* Flash is destination for this packet */
 178                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 179                 if (rc) {
 180                         flash_perror(rc);
 181                         net_set_state(NETLOOP_FAIL);
 182                         return;
 183                 }
 184         } else
 185 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 186         {
 187                 (void)memcpy((void *)(load_addr + offset), src, len);
 188         }
 189 #ifdef CONFIG_MCAST_TFTP
 190         if (Multicast)
 191                 ext2_set_bit(block, Bitmap);
 192 #endif
 193
 194         if (NetBootFileXferSize < newsize)
 195                 NetBootFileXferSize = newsize;
 196 }
 197
 198 /* Clear our state ready for a new transfer */
 199 static void new_transfer(void)
 200 {
 201         TftpLastBlock = 0;
 202         TftpBlockWrap = 0;
 203         TftpBlockWrapOffset = 0;
 204 #ifdef CONFIG_CMD_TFTPPUT
 205         TftpFinalBlock = 0;
 206 #endif
 207 }
 208
 209 #ifdef CONFIG_CMD_TFTPPUT
 210 /**
 211  * Load the next block from memory to be sent over tftp.
 212  *
 213  * @param block Block number to send
 214  * @param dst   Destination buffer for data
 215  * @param len   Number of bytes in block (this one and every other)
 216  * @return number of bytes loaded
 217  */
 218 static int load_block(unsigned block, uchar *dst, unsigned len)
 219 {
 220         /* We may want to get the final block from the previous set */
 221         ulong offset = ((int)block - 1) * len + TftpBlockWrapOffset;
 222         ulong tosend = len;
 223
 224         tosend = min(NetBootFileXferSize - offset, tosend);
 225         (void)memcpy(dst, (void *)(save_addr + offset), tosend);
 226         debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
 227                 block, offset, len, tosend);
 228         return tosend;
 229 }
 230 #endif
 231
 232 static void TftpSend(void);
 233 static void TftpTimeout(void);
 234
 235 /**********************************************************************/
 236
 237 static void show_block_marker(void)
 238 {
 239 #ifdef CONFIG_TFTP_TSIZE
 240         if (TftpTsize) {
 241                 ulong pos = TftpBlock * TftpBlkSize + TftpBlockWrapOffset;
 242
 243                 while (TftpNumchars < pos * 50 / TftpTsize) {
 244                         putc('#');
 245                         TftpNumchars++;
 246                 }
 247         } else
 248 #endif
 249         {
 250                 if (((TftpBlock - 1) % 10) == 0)
 251                         putc('#');
 252                 else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 253                         puts("\n\t ");
 254         }
 255 }
 256
 257 /**
 258  * restart the current transfer due to an error
 259  *
 260  * @param msg   Message to print for user
 261  */
 262 static void restart(const char *msg)
 263 {
 264         printf("\n%s; starting again\n", msg);
 265 #ifdef CONFIG_MCAST_TFTP
 266         mcast_cleanup();
 267 #endif
 268         NetStartAgain();
 269 }
 270
 271 /*
 272  * Check if the block number has wrapped, and update progress
 273  *
 274  * TODO: The egregious use of global variables in this file should be tidied.
 275  */
 276 static void update_block_number(void)
 277 {
 278         /*
 279          * RFC1350 specifies that the first data packet will
 280          * have sequence number 1. If we receive a sequence
 281          * number of 0 this means that there was a wrap
 282          * around of the (16 bit) counter.
 283          */
 284         if (TftpBlock == 0 && TftpLastBlock != 0) {
 285                 TftpBlockWrap++;
 286                 TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
 287                 TftpTimeoutCount = 0; /* we've done well, reset thhe timeout */
 288         } else {
 289                 show_block_marker();
 290         }
 291 }
 292
 293 /* The TFTP get or put is complete */
 294 static void tftp_complete(void)
 295 {
 296 #ifdef CONFIG_TFTP_TSIZE
 297         /* Print hash marks for the last packet received */
 298         while (TftpTsize && TftpNumchars < 49) {
 299                 putc('#');
 300                 TftpNumchars++;
 301         }
 302         puts("  ");
 303         print_size(TftpTsize, "");
 304 #endif
 305         time_start = get_timer(time_start);
 306         if (time_start > 0) {
 307                 puts("\n\t ");  /* Line up with "Loading: " */
 308                 print_size(NetBootFileXferSize /
 309                         time_start * 1000, "/s");
 310         }
 311         puts("\ndone\n");
 312         net_set_state(NETLOOP_SUCCESS);
 313 }
 314
 315 static void
 316 TftpSend(void)
 317 {
 318         uchar *pkt;
 319         uchar *xp;
 320         int len = 0;
 321         ushort *s;
 322
 323 #ifdef CONFIG_MCAST_TFTP
 324         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 325         if (Multicast
 326          && (TftpState == STATE_DATA)
 327          && (MasterClient == 0))
 328                 return;
 329 #endif
 330         /*
 331          *      We will always be sending some sort of packet, so
 332          *      cobble together the packet headers now.
 333          */
 334         pkt = NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 335
 336         switch (TftpState) {
 337         case STATE_SEND_RRQ:
 338         case STATE_SEND_WRQ:
 339                 xp = pkt;
 340                 s = (ushort *)pkt;
 341 #ifdef CONFIG_CMD_TFTPPUT
 342                 *s++ = htons(TftpState == STATE_SEND_RRQ ? TFTP_RRQ :
 343                         TFTP_WRQ);
 344 #else
 345                 *s++ = htons(TFTP_RRQ);
 346 #endif
 347                 pkt = (uchar *)s;
 348                 strcpy((char *)pkt, tftp_filename);
 349                 pkt += strlen(tftp_filename) + 1;
 350                 strcpy((char *)pkt, "octet");
 351                 pkt += 5 /*strlen("octet")*/ + 1;
 352                 strcpy((char *)pkt, "timeout");
 353                 pkt += 7 /*strlen("timeout")*/ + 1;
 354                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 355                 debug("send option \"timeout %s\"\n", (char *)pkt);
 356                 pkt += strlen((char *)pkt) + 1;
 357 #ifdef CONFIG_TFTP_TSIZE
 358                 pkt += sprintf((char *)pkt, "tsize%c%lu%c",
 359                                 0, NetBootFileXferSize, 0);
 360 #endif
 361                 /* try for more effic. blk size */
 362                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 363                                 0, TftpBlkSizeOption, 0);
 364 #ifdef CONFIG_MCAST_TFTP
 365                 /* Check all preconditions before even trying the option */
 366                 if (!ProhibitMcast) {
 367                         Bitmap = malloc(Mapsize);
 368                         if (Bitmap && eth_get_dev()->mcast) {
 369                                 free(Bitmap);
 370                                 Bitmap = NULL;
 371                                 pkt += sprintf((char *)pkt, "multicast%c%c",
 372                                         0, 0);
 373                         }
 374                 }
 375 #endif /* CONFIG_MCAST_TFTP */
 376                 len = pkt - xp;
 377                 break;
 378
 379         case STATE_OACK:
 380 #ifdef CONFIG_MCAST_TFTP
 381                 /* My turn!  Start at where I need blocks I missed.*/
 382                 if (Multicast)
 383                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 384                                                             (Mapsize*8), 0);
 385                 /*..falling..*/
 386 #endif
 387
 388         case STATE_RECV_WRQ:
 389         case STATE_DATA:
 390                 xp = pkt;
 391                 s = (ushort *)pkt;
 392                 s[0] = htons(TFTP_ACK);
 393                 s[1] = htons(TftpBlock);
 394                 pkt = (uchar *)(s + 2);
 395 #ifdef CONFIG_CMD_TFTPPUT
 396                 if (TftpWriting) {
 397                         int toload = TftpBlkSize;
 398                         int loaded = load_block(TftpBlock, pkt, toload);
 399
 400                         s[0] = htons(TFTP_DATA);
 401                         pkt += loaded;
 402                         TftpFinalBlock = (loaded < toload);
 403                 }
 404 #endif
 405                 len = pkt - xp;
 406                 break;
 407
 408         case STATE_TOO_LARGE:
 409                 xp = pkt;
 410                 s = (ushort *)pkt;
 411                 *s++ = htons(TFTP_ERROR);
 412                         *s++ = htons(3);
 413
 414                 pkt = (uchar *)s;
 415                 strcpy((char *)pkt, "File too large");
 416                 pkt += 14 /*strlen("File too large")*/ + 1;
 417                 len = pkt - xp;
 418                 break;
 419
 420         case STATE_BAD_MAGIC:
 421                 xp = pkt;
 422                 s = (ushort *)pkt;
 423                 *s++ = htons(TFTP_ERROR);
 424                 *s++ = htons(2);
 425                 pkt = (uchar *)s;
 426                 strcpy((char *)pkt, "File has bad magic");
 427                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 428                 len = pkt - xp;
 429                 break;
 430         }
 431
 432         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 433                          TftpOurPort, len);
 434 }
 435
 436 #ifdef CONFIG_CMD_TFTPPUT
 437 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 438                          IPaddr_t sip, unsigned src, uchar *pkt, unsigned len)
 439 {
 440         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 441                 /* Oh dear the other end has gone away */
 442                 restart("TFTP server died");
 443         }
 444 }
 445 #endif
 446
 447 static void
 448 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 449             unsigned len)
 450 {
 451         __be16 proto;
 452         __be16 *s;
 453         int i;
 454
 455         if (dest != TftpOurPort) {
 456 #ifdef CONFIG_MCAST_TFTP
 457                 if (Multicast
 458                  && (!Mcast_port || (dest != Mcast_port)))
 459 #endif
 460                         return;
 461         }
 462         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 463             TftpState != STATE_RECV_WRQ && TftpState != STATE_SEND_WRQ)
 464                 return;
 465
 466         if (len < 2)
 467                 return;
 468         len -= 2;
 469         /* warning: don't use increment (++) in ntohs() macros!! */
 470         s = (__be16 *)pkt;
 471         proto = *s++;
 472         pkt = (uchar *)s;
 473         switch (ntohs(proto)) {
 474
 475         case TFTP_RRQ:
 476                 break;
 477
 478         case TFTP_ACK:
 479 #ifdef CONFIG_CMD_TFTPPUT
 480                 if (TftpWriting) {
 481                         if (TftpFinalBlock) {
 482                                 tftp_complete();
 483                         } else {
 484                                 /*
 485                                  * Move to the next block. We want our block
 486                                  * count to wrap just like the other end!
 487                                  */
 488                                 int block = ntohs(*s);
 489                                 int ack_ok = (TftpBlock == block);
 490
 491                                 TftpBlock = (unsigned short)(block + 1);
 492                                 update_block_number();
 493                                 if (ack_ok)
 494                                         TftpSend(); /* Send next data block */
 495                         }
 496                 }
 497 #endif
 498                 break;
 499
 500         default:
 501                 break;
 502
 503 #ifdef CONFIG_CMD_TFTPSRV
 504         case TFTP_WRQ:
 505                 debug("Got WRQ\n");
 506                 TftpRemoteIP = sip;
 507                 TftpRemotePort = src;
 508                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 509                 new_transfer();
 510                 TftpSend(); /* Send ACK(0) */
 511                 break;
 512 #endif
 513
 514         case TFTP_OACK:
 515                 debug("Got OACK: %s %s\n",
 516                         pkt,
 517                         pkt + strlen((char *)pkt) + 1);
 518                 TftpState = STATE_OACK;
 519                 TftpRemotePort = src;
 520                 /*
 521                  * Check for 'blksize' option.
 522                  * Careful: "i" is signed, "len" is unsigned, thus
 523                  * something like "len-8" may give a *huge* number
 524                  */
 525                 for (i = 0; i+8 < len; i++) {
 526                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 527                                 TftpBlkSize = (unsigned short)
 528                                         simple_strtoul((char *)pkt+i+8, NULL,
 529                                                        10);
 530                                 debug("Blocksize ack: %s, %d\n",
 531                                         (char *)pkt+i+8, TftpBlkSize);
 532                         }
 533 #ifdef CONFIG_TFTP_TSIZE
 534                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 535                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 536                                                            NULL, 10);
 537                                 debug("size = %s, %d\n",
 538                                          (char *)pkt+i+6, TftpTsize);
 539                         }
 540 #endif
 541                 }
 542 #ifdef CONFIG_MCAST_TFTP
 543                 parse_multicast_oack((char *)pkt, len-1);
 544                 if ((Multicast) && (!MasterClient))
 545                         TftpState = STATE_DATA; /* passive.. */
 546                 else
 547 #endif
 548 #ifdef CONFIG_CMD_TFTPPUT
 549                 if (TftpWriting) {
 550                         /* Get ready to send the first block */
 551                         TftpState = STATE_DATA;
 552                         TftpBlock++;
 553                 }
 554 #endif
 555                 TftpSend(); /* Send ACK or first data block */
 556                 break;
 557         case TFTP_DATA:
 558                 if (len < 2)
 559                         return;
 560                 len -= 2;
 561                 TftpBlock = ntohs(*(__be16 *)pkt);
 562
 563                 update_block_number();
 564
 565                 if (TftpState == STATE_SEND_RRQ)
 566                         debug("Server did not acknowledge timeout option!\n");
 567
 568                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 569                     TftpState == STATE_RECV_WRQ) {
 570                         /* first block received */
 571                         TftpState = STATE_DATA;
 572                         TftpRemotePort = src;
 573                         new_transfer();
 574
 575 #ifdef CONFIG_MCAST_TFTP
 576                         if (Multicast) { /* start!=1 common if mcast */
 577                                 TftpLastBlock = TftpBlock - 1;
 578                         } else
 579 #endif
 580                         if (TftpBlock != 1) {   /* Assertion */
 581                                 printf("\nTFTP error: "
 582                                        "First block is not block 1 (%ld)\n"
 583                                        "Starting again\n\n",
 584                                         TftpBlock);
 585                                 NetStartAgain();
 586                                 break;
 587                         }
 588                 }
 589
 590                 if (TftpBlock == TftpLastBlock) {
 591                         /*
 592                          *      Same block again; ignore it.
 593                          */
 594                         break;
 595                 }
 596
 597                 TftpLastBlock = TftpBlock;
 598                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 599                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 600
 601                 store_block(TftpBlock - 1, pkt + 2, len);
 602
 603                 /*
 604                  *      Acknowledge the block just received, which will prompt
 605                  *      the remote for the next one.
 606                  */
 607 #ifdef CONFIG_MCAST_TFTP
 608                 /* if I am the MasterClient, actively calculate what my next
 609                  * needed block is; else I'm passive; not ACKING
 610                  */
 611                 if (Multicast) {
 612                         if (len < TftpBlkSize)  {
 613                                 TftpEndingBlock = TftpBlock;
 614                         } else if (MasterClient) {
 615                                 TftpBlock = PrevBitmapHole =
 616                                         ext2_find_next_zero_bit(
 617                                                 Bitmap,
 618                                                 (Mapsize*8),
 619                                                 PrevBitmapHole);
 620                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 621                                         printf("tftpfile too big\n");
 622                                         /* try to double it and retry */
 623                                         Mapsize <<= 1;
 624                                         mcast_cleanup();
 625                                         NetStartAgain();
 626                                         return;
 627                                 }
 628                                 TftpLastBlock = TftpBlock;
 629                         }
 630                 }
 631 #endif
 632                 TftpSend();
 633
 634 #ifdef CONFIG_MCAST_TFTP
 635                 if (Multicast) {
 636                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 637                                 puts("\nMulticast tftp done\n");
 638                                 mcast_cleanup();
 639                                 net_set_state(NETLOOP_SUCCESS);
 640                         }
 641                 } else
 642 #endif
 643                 if (len < TftpBlkSize)
 644                         tftp_complete();
 645                 break;
 646
 647         case TFTP_ERROR:
 648                 printf("\nTFTP error: '%s' (%d)\n",
 649                        pkt + 2, ntohs(*(__be16 *)pkt));
 650
 651                 switch (ntohs(*(__be16 *)pkt)) {
 652                 case TFTP_ERR_FILE_NOT_FOUND:
 653                 case TFTP_ERR_ACCESS_DENIED:
 654                         puts("Not retrying...\n");
 655                         eth_halt();
 656                         net_set_state(NETLOOP_FAIL);
 657                         break;
 658                 case TFTP_ERR_UNDEFINED:
 659                 case TFTP_ERR_DISK_FULL:
 660                 case TFTP_ERR_UNEXPECTED_OPCODE:
 661                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 662                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 663                 default:
 664                         puts("Starting again\n\n");
 665 #ifdef CONFIG_MCAST_TFTP
 666                         mcast_cleanup();
 667 #endif
 668                         NetStartAgain();
 669                         break;
 670                 }
 671                 break;
 672         }
 673 }
 674
 675
 676 static void
 677 TftpTimeout(void)
 678 {
 679         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 680                 restart("Retry count exceeded");
 681         } else {
 682                 puts("T ");
 683                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 684                 if (TftpState != STATE_RECV_WRQ)
 685                         TftpSend();
 686         }
 687 }
 688
 689
 690 void TftpStart(enum proto_t protocol)
 691 {
 692         char *ep;             /* Environment pointer */
 693
 694         /*
 695          * Allow the user to choose TFTP blocksize and timeout.
 696          * TFTP protocol has a minimal timeout of 1 second.
 697          */
 698         ep = getenv("tftpblocksize");
 699         if (ep != NULL)
 700                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 701
 702         ep = getenv("tftptimeout");
 703         if (ep != NULL)
 704                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 705
 706         if (TftpTimeoutMSecs < 1000) {
 707                 printf("TFTP timeout (%ld ms) too low, "
 708                         "set minimum = 1000 ms\n",
 709                         TftpTimeoutMSecs);
 710                 TftpTimeoutMSecs = 1000;
 711         }
 712
 713         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 714                 TftpBlkSizeOption, TftpTimeoutMSecs);
 715
 716         TftpRemoteIP = NetServerIP;
 717         if (BootFile[0] == '\0') {
 718                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 719                         NetOurIP & 0xFF,
 720                         (NetOurIP >>  8) & 0xFF,
 721                         (NetOurIP >> 16) & 0xFF,
 722                         (NetOurIP >> 24) & 0xFF);
 723
 724                 strncpy(tftp_filename, default_filename, MAX_LEN);
 725                 tftp_filename[MAX_LEN-1] = 0;
 726
 727                 printf("*** Warning: no boot file name; using '%s'\n",
 728                         tftp_filename);
 729         } else {
 730                 char *p = strchr(BootFile, ':');
 731
 732                 if (p == NULL) {
 733                         strncpy(tftp_filename, BootFile, MAX_LEN);
 734                         tftp_filename[MAX_LEN-1] = 0;
 735                 } else {
 736                         TftpRemoteIP = string_to_ip(BootFile);
 737                         strncpy(tftp_filename, p + 1, MAX_LEN);
 738                         tftp_filename[MAX_LEN-1] = 0;
 739                 }
 740         }
 741
 742         printf("Using %s device\n", eth_get_name());
 743         printf("TFTP %s server %pI4; our IP address is %pI4",
 744 #ifdef CONFIG_CMD_TFTPPUT
 745                protocol == TFTPPUT ? "to" : "from",
 746 #else
 747                 "from",
 748 #endif
 749                 &TftpRemoteIP, &NetOurIP);
 750
 751         /* Check if we need to send across this subnet */
 752         if (NetOurGatewayIP && NetOurSubnetMask) {
 753                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 754                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 755
 756                 if (OurNet != RemoteNet)
 757                         printf("; sending through gateway %pI4",
 758                                &NetOurGatewayIP);
 759         }
 760         putc('\n');
 761
 762         printf("Filename '%s'.", tftp_filename);
 763
 764         if (NetBootFileSize) {
 765                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 766                 print_size(NetBootFileSize<<9, "");
 767         }
 768
 769         putc('\n');
 770 #ifdef CONFIG_CMD_TFTPPUT
 771         TftpWriting = (protocol == TFTPPUT);
 772         if (TftpWriting) {
 773                 printf("Save address: 0x%lx\n", save_addr);
 774                 printf("Save size:    0x%lx\n", save_size);
 775                 NetBootFileXferSize = save_size;
 776                 puts("Saving: *\b");
 777                 TftpState = STATE_SEND_WRQ;
 778                 new_transfer();
 779         } else
 780 #endif
 781         {
 782                 printf("Load address: 0x%lx\n", load_addr);
 783                 puts("Loading: *\b");
 784                 TftpState = STATE_SEND_RRQ;
 785         }
 786
 787         time_start = get_timer(0);
 788         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 789
 790         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 791         net_set_udp_handler(TftpHandler);
 792 #ifdef CONFIG_CMD_TFTPPUT
 793         net_set_icmp_handler(icmp_handler);
 794 #endif
 795         TftpRemotePort = WELL_KNOWN_PORT;
 796         TftpTimeoutCount = 0;
 797         /* Use a pseudo-random port unless a specific port is set */
 798         TftpOurPort = 1024 + (get_timer(0) % 3072);
 799
 800 #ifdef CONFIG_TFTP_PORT
 801         ep = getenv("tftpdstp");
 802         if (ep != NULL)
 803                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 804         ep = getenv("tftpsrcp");
 805         if (ep != NULL)
 806                 TftpOurPort = simple_strtol(ep, NULL, 10);
 807 #endif
 808         TftpBlock = 0;
 809
 810         /* zero out server ether in case the server ip has changed */
 811         memset(NetServerEther, 0, 6);
 812         /* Revert TftpBlkSize to dflt */
 813         TftpBlkSize = TFTP_BLOCK_SIZE;
 814 #ifdef CONFIG_MCAST_TFTP
 815         mcast_cleanup();
 816 #endif
 817 #ifdef CONFIG_TFTP_TSIZE
 818         TftpTsize = 0;
 819         TftpNumchars = 0;
 820 #endif
 821
 822         TftpSend();
 823 }
 824
 825 #ifdef CONFIG_CMD_TFTPSRV
 826 void
 827 TftpStartServer(void)
 828 {
 829         tftp_filename[0] = 0;
 830
 831         printf("Using %s device\n", eth_get_name());
 832         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 833         printf("Load address: 0x%lx\n", load_addr);
 834
 835         puts("Loading: *\b");
 836
 837         TftpTimeoutCountMax = TIMEOUT_COUNT;
 838         TftpTimeoutCount = 0;
 839         TftpTimeoutMSecs = TIMEOUT;
 840         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 841
 842         /* Revert TftpBlkSize to dflt */
 843         TftpBlkSize = TFTP_BLOCK_SIZE;
 844         TftpBlock = 0;
 845         TftpOurPort = WELL_KNOWN_PORT;
 846
 847 #ifdef CONFIG_TFTP_TSIZE
 848         TftpTsize = 0;
 849         TftpNumchars = 0;
 850 #endif
 851
 852         TftpState = STATE_RECV_WRQ;
 853         net_set_udp_handler(TftpHandler);
 854
 855         /* zero out server ether in case the server ip has changed */
 856         memset(NetServerEther, 0, 6);
 857 }
 858 #endif /* CONFIG_CMD_TFTPSRV */
 859
 860 #ifdef CONFIG_MCAST_TFTP
 861 /* Credits: atftp project.
 862  */
 863
 864 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 865  * Frame:
 866  *    +-------+-----------+---+-------~~-------+---+
 867  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 868  *    +-------+-----------+---+-------~~-------+---+
 869  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 870  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 871  * master-client, I'm a passive client, gathering what DataBlocks I may and
 872  * making note of which ones I got in my bitmask.
 873  * In theory, I never go from master->passive..
 874  * .. this comes in with pkt already pointing just past opc
 875  */
 876 static void parse_multicast_oack(char *pkt, int len)
 877 {
 878         int i;
 879         IPaddr_t addr;
 880         char *mc_adr, *port,  *mc;
 881
 882         mc_adr = port = mc = NULL;
 883         /* march along looking for 'multicast\0', which has to start at least
 884          * 14 bytes back from the end.
 885          */
 886         for (i = 0; i < len-14; i++)
 887                 if (strcmp(pkt+i, "multicast") == 0)
 888                         break;
 889         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 890                 return;
 891
 892         i += 10; /* strlen multicast */
 893         mc_adr = pkt+i;
 894         for (; i < len; i++) {
 895                 if (*(pkt+i) == ',') {
 896                         *(pkt+i) = '\0';
 897                         if (port) {
 898                                 mc = pkt+i+1;
 899                                 break;
 900                         } else {
 901                                 port = pkt+i+1;
 902                         }
 903                 }
 904         }
 905         if (!port || !mc_adr || !mc)
 906                 return;
 907         if (Multicast && MasterClient) {
 908                 printf("I got a OACK as master Client, WRONG!\n");
 909                 return;
 910         }
 911         /* ..I now accept packets destined for this MCAST addr, port */
 912         if (!Multicast) {
 913                 if (Bitmap) {
 914                         printf("Internal failure! no mcast.\n");
 915                         free(Bitmap);
 916                         Bitmap = NULL;
 917                         ProhibitMcast = 1;
 918                         return ;
 919                 }
 920                 /* I malloc instead of pre-declare; so that if the file ends
 921                  * up being too big for this bitmap I can retry
 922                  */
 923                 Bitmap = malloc(Mapsize);
 924                 if (!Bitmap) {
 925                         printf("No Bitmap, no multicast. Sorry.\n");
 926                         ProhibitMcast = 1;
 927                         return;
 928                 }
 929                 memset(Bitmap, 0, Mapsize);
 930                 PrevBitmapHole = 0;
 931                 Multicast = 1;
 932         }
 933         addr = string_to_ip(mc_adr);
 934         if (Mcast_addr != addr) {
 935                 if (Mcast_addr)
 936                         eth_mcast_join(Mcast_addr, 0);
 937                 Mcast_addr = addr;
 938                 if (eth_mcast_join(Mcast_addr, 1)) {
 939                         printf("Fail to set mcast, revert to TFTP\n");
 940                         ProhibitMcast = 1;
 941                         mcast_cleanup();
 942                         NetStartAgain();
 943                 }
 944         }
 945         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 946         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 947         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 948         return;
 949 }
 950
 951 #endif /* Multicast TFTP */