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
  44 /*
  45  * These globals govern the timeout behavior when attempting a connection to a
  46  * TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
  47  * wait for the server to respond to initial connection. Second global,
  48  * TftpRRQTimeoutCountMax, gives the number of such connection retries.
  49  * TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
  50  * positive. The globals are meant to be set (and restored) by code needing
  51  * non-standard timeout behavior when initiating a TFTP transfer.
  52  */
  53 ulong TftpRRQTimeoutMSecs = TIMEOUT;
  54 int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
  55
  56 enum {
  57         TFTP_ERR_UNDEFINED           = 0,
  58         TFTP_ERR_FILE_NOT_FOUND      = 1,
  59         TFTP_ERR_ACCESS_DENIED       = 2,
  60         TFTP_ERR_DISK_FULL           = 3,
  61         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  62         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  63         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  64 };
  65
  66 static IPaddr_t TftpRemoteIP;
  67 /* The UDP port at their end */
  68 static int      TftpRemotePort;
  69 /* The UDP port at our end */
  70 static int      TftpOurPort;
  71 static int      TftpTimeoutCount;
  72 /* packet sequence number */
  73 static ulong    TftpBlock;
  74 /* last packet sequence number received */
  75 static ulong    TftpLastBlock;
  76 /* count of sequence number wraparounds */
  77 static ulong    TftpBlockWrap;
  78 /* memory offset due to wrapping */
  79 static ulong    TftpBlockWrapOffset;
  80 static int      TftpState;
  81 #ifdef CONFIG_TFTP_TSIZE
  82 /* The file size reported by the server */
  83 static int      TftpTsize;
  84 /* The number of hashes we printed */
  85 static short    TftpNumchars;
  86 #endif
  87 #ifdef CONFIG_CMD_TFTPPUT
  88 static int      TftpWriting;    /* 1 if writing, else 0 */
  89 static int      TftpFinalBlock; /* 1 if we have sent the last block */
  90 #else
  91 #define TftpWriting     0
  92 #endif
  93
  94 #define STATE_SEND_RRQ  1
  95 #define STATE_DATA      2
  96 #define STATE_TOO_LARGE 3
  97 #define STATE_BAD_MAGIC 4
  98 #define STATE_OACK      5
  99 #define STATE_RECV_WRQ  6
 100 #define STATE_SEND_WRQ  7
 101
 102 /* default TFTP block size */
 103 #define TFTP_BLOCK_SIZE         512
 104 /* sequence number is 16 bit */
 105 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 106
 107 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 108 static char default_filename[DEFAULT_NAME_LEN];
 109
 110 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 111 #define MAX_LEN 128
 112 #else
 113 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 114 #endif
 115
 116 static char tftp_filename[MAX_LEN];
 117
 118 /* 512 is poor choice for ethernet, MTU is typically 1500.
 119  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 120  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 121  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 122  */
 123 #ifdef CONFIG_TFTP_BLOCKSIZE
 124 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 125 #else
 126 #define TFTP_MTU_BLOCKSIZE 1468
 127 #endif
 128
 129 static unsigned short TftpBlkSize = TFTP_BLOCK_SIZE;
 130 static unsigned short TftpBlkSizeOption = TFTP_MTU_BLOCKSIZE;
 131
 132 #ifdef CONFIG_MCAST_TFTP
 133 #include <malloc.h>
 134 #define MTFTP_BITMAPSIZE        0x1000
 135 static unsigned *Bitmap;
 136 static int PrevBitmapHole, Mapsize = MTFTP_BITMAPSIZE;
 137 static uchar ProhibitMcast, MasterClient;
 138 static uchar Multicast;
 139 static int Mcast_port;
 140 static ulong TftpEndingBlock; /* can get 'last' block before done..*/
 141
 142 static void parse_multicast_oack(char *pkt, int len);
 143
 144 static void
 145 mcast_cleanup(void)
 146 {
 147         if (Mcast_addr)
 148                 eth_mcast_join(Mcast_addr, 0);
 149         if (Bitmap)
 150                 free(Bitmap);
 151         Bitmap = NULL;
 152         Mcast_addr = Multicast = Mcast_port = 0;
 153         TftpEndingBlock = -1;
 154 }
 155
 156 #endif  /* CONFIG_MCAST_TFTP */
 157
 158 static inline void
 159 store_block(unsigned block, uchar *src, unsigned len)
 160 {
 161         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 162         ulong newsize = offset + len;
 163 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 164         int i, rc = 0;
 165
 166         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 167                 /* start address in flash? */
 168                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 169                         continue;
 170                 if (load_addr + offset >= flash_info[i].start[0]) {
 171                         rc = 1;
 172                         break;
 173                 }
 174         }
 175
 176         if (rc) { /* Flash is destination for this packet */
 177                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 178                 if (rc) {
 179                         flash_perror(rc);
 180                         net_set_state(NETLOOP_FAIL);
 181                         return;
 182                 }
 183         } else
 184 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 185         {
 186                 (void)memcpy((void *)(load_addr + offset), src, len);
 187         }
 188 #ifdef CONFIG_MCAST_TFTP
 189         if (Multicast)
 190                 ext2_set_bit(block, Bitmap);
 191 #endif
 192
 193         if (NetBootFileXferSize < newsize)
 194                 NetBootFileXferSize = newsize;
 195 }
 196
 197 /* Clear our state ready for a new transfer */
 198 static void new_transfer(void)
 199 {
 200         TftpLastBlock = 0;
 201         TftpBlockWrap = 0;
 202         TftpBlockWrapOffset = 0;
 203 #ifdef CONFIG_CMD_TFTPPUT
 204         TftpFinalBlock = 0;
 205 #endif
 206 }
 207
 208 #ifdef CONFIG_CMD_TFTPPUT
 209 /**
 210  * Load the next block from memory to be sent over tftp.
 211  *
 212  * @param block Block number to send
 213  * @param dst   Destination buffer for data
 214  * @param len   Number of bytes in block (this one and every other)
 215  * @return number of bytes loaded
 216  */
 217 static int load_block(unsigned block, uchar *dst, unsigned len)
 218 {
 219         /* We may want to get the final block from the previous set */
 220         ulong offset = ((int)block - 1) * len + TftpBlockWrapOffset;
 221         ulong tosend = len;
 222
 223         tosend = min(NetBootFileXferSize - offset, tosend);
 224         (void)memcpy(dst, (void *)(save_addr + offset), tosend);
 225         debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
 226                 block, offset, len, tosend);
 227         return tosend;
 228 }
 229 #endif
 230
 231 static void TftpSend(void);
 232 static void TftpTimeout(void);
 233
 234 /**********************************************************************/
 235
 236 static void show_block_marker(void)
 237 {
 238 #ifdef CONFIG_TFTP_TSIZE
 239         if (TftpTsize) {
 240                 ulong pos = TftpBlock * TftpBlkSize + TftpBlockWrapOffset;
 241
 242                 while (TftpNumchars < pos * 50 / TftpTsize) {
 243                         putc('#');
 244                         TftpNumchars++;
 245                 }
 246         } else
 247 #endif
 248         {
 249                 if (((TftpBlock - 1) % 10) == 0)
 250                         putc('#');
 251                 else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 252                         puts("\n\t ");
 253         }
 254 }
 255
 256 /**
 257  * restart the current transfer due to an error
 258  *
 259  * @param msg   Message to print for user
 260  */
 261 static void restart(const char *msg)
 262 {
 263         printf("\n%s; starting again\n", msg);
 264 #ifdef CONFIG_MCAST_TFTP
 265         mcast_cleanup();
 266 #endif
 267         NetStartAgain();
 268 }
 269
 270 /*
 271  * Check if the block number has wrapped, and update progress
 272  *
 273  * TODO: The egregious use of global variables in this file should be tidied.
 274  */
 275 static void update_block_number(void)
 276 {
 277         /*
 278          * RFC1350 specifies that the first data packet will
 279          * have sequence number 1. If we receive a sequence
 280          * number of 0 this means that there was a wrap
 281          * around of the (16 bit) counter.
 282          */
 283         if (TftpBlock == 0) {
 284                 TftpBlockWrap++;
 285                 TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
 286                 TftpTimeoutCount = 0; /* we've done well, reset thhe timeout */
 287         } else {
 288                 show_block_marker();
 289         }
 290 }
 291
 292 /* The TFTP get or put is complete */
 293 static void tftp_complete(void)
 294 {
 295 #ifdef CONFIG_TFTP_TSIZE
 296         /* Print hash marks for the last packet received */
 297         while (TftpTsize && TftpNumchars < 49) {
 298                 putc('#');
 299                 TftpNumchars++;
 300         }
 301 #endif
 302         puts("\ndone\n");
 303         net_set_state(NETLOOP_SUCCESS);
 304 }
 305
 306 static void
 307 TftpSend(void)
 308 {
 309         uchar *pkt;
 310         uchar *xp;
 311         int len = 0;
 312         ushort *s;
 313
 314 #ifdef CONFIG_MCAST_TFTP
 315         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 316         if (Multicast
 317          && (TftpState == STATE_DATA)
 318          && (MasterClient == 0))
 319                 return;
 320 #endif
 321         /*
 322          *      We will always be sending some sort of packet, so
 323          *      cobble together the packet headers now.
 324          */
 325         pkt = NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 326
 327         switch (TftpState) {
 328         case STATE_SEND_RRQ:
 329         case STATE_SEND_WRQ:
 330                 xp = pkt;
 331                 s = (ushort *)pkt;
 332 #ifdef CONFIG_CMD_TFTPPUT
 333                 *s++ = htons(TftpState == STATE_SEND_RRQ ? TFTP_RRQ :
 334                         TFTP_WRQ);
 335 #else
 336                 *s++ = htons(TFTP_RRQ);
 337 #endif
 338                 pkt = (uchar *)s;
 339                 strcpy((char *)pkt, tftp_filename);
 340                 pkt += strlen(tftp_filename) + 1;
 341                 strcpy((char *)pkt, "octet");
 342                 pkt += 5 /*strlen("octet")*/ + 1;
 343                 strcpy((char *)pkt, "timeout");
 344                 pkt += 7 /*strlen("timeout")*/ + 1;
 345                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 346                 debug("send option \"timeout %s\"\n", (char *)pkt);
 347                 pkt += strlen((char *)pkt) + 1;
 348 #ifdef CONFIG_TFTP_TSIZE
 349                 pkt += sprintf((char *)pkt, "tsize%c%lu%c",
 350                                 0, NetBootFileXferSize, 0);
 351 #endif
 352                 /* try for more effic. blk size */
 353                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 354                                 0, TftpBlkSizeOption, 0);
 355 #ifdef CONFIG_MCAST_TFTP
 356                 /* Check all preconditions before even trying the option */
 357                 if (!ProhibitMcast) {
 358                         Bitmap = malloc(Mapsize);
 359                         if (Bitmap && eth_get_dev()->mcast) {
 360                                 free(Bitmap);
 361                                 Bitmap = NULL;
 362                                 pkt += sprintf((char *)pkt, "multicast%c%c",
 363                                         0, 0);
 364                         }
 365                 }
 366 #endif /* CONFIG_MCAST_TFTP */
 367                 len = pkt - xp;
 368                 break;
 369
 370         case STATE_OACK:
 371 #ifdef CONFIG_MCAST_TFTP
 372                 /* My turn!  Start at where I need blocks I missed.*/
 373                 if (Multicast)
 374                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 375                                                             (Mapsize*8), 0);
 376                 /*..falling..*/
 377 #endif
 378
 379         case STATE_RECV_WRQ:
 380         case STATE_DATA:
 381                 xp = pkt;
 382                 s = (ushort *)pkt;
 383                 s[0] = htons(TFTP_ACK);
 384                 s[1] = htons(TftpBlock);
 385                 pkt = (uchar *)(s + 2);
 386 #ifdef CONFIG_CMD_TFTPPUT
 387                 if (TftpWriting) {
 388                         int toload = TftpBlkSize;
 389                         int loaded = load_block(TftpBlock, pkt, toload);
 390
 391                         s[0] = htons(TFTP_DATA);
 392                         pkt += loaded;
 393                         TftpFinalBlock = (loaded < toload);
 394                 }
 395 #endif
 396                 len = pkt - xp;
 397                 break;
 398
 399         case STATE_TOO_LARGE:
 400                 xp = pkt;
 401                 s = (ushort *)pkt;
 402                 *s++ = htons(TFTP_ERROR);
 403                         *s++ = htons(3);
 404
 405                 pkt = (uchar *)s;
 406                 strcpy((char *)pkt, "File too large");
 407                 pkt += 14 /*strlen("File too large")*/ + 1;
 408                 len = pkt - xp;
 409                 break;
 410
 411         case STATE_BAD_MAGIC:
 412                 xp = pkt;
 413                 s = (ushort *)pkt;
 414                 *s++ = htons(TFTP_ERROR);
 415                 *s++ = htons(2);
 416                 pkt = (uchar *)s;
 417                 strcpy((char *)pkt, "File has bad magic");
 418                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 419                 len = pkt - xp;
 420                 break;
 421         }
 422
 423         NetSendUDPPacket(NetServerEther, TftpRemoteIP, TftpRemotePort,
 424                          TftpOurPort, len);
 425 }
 426
 427 #ifdef CONFIG_CMD_TFTPPUT
 428 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 429                          IPaddr_t sip, unsigned src, uchar *pkt, unsigned len)
 430 {
 431         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 432                 /* Oh dear the other end has gone away */
 433                 restart("TFTP server died");
 434         }
 435 }
 436 #endif
 437
 438 static void
 439 TftpHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src,
 440             unsigned len)
 441 {
 442         ushort proto;
 443         ushort *s;
 444         int i;
 445
 446         if (dest != TftpOurPort) {
 447 #ifdef CONFIG_MCAST_TFTP
 448                 if (Multicast
 449                  && (!Mcast_port || (dest != Mcast_port)))
 450 #endif
 451                         return;
 452         }
 453         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 454             TftpState != STATE_RECV_WRQ && TftpState != STATE_SEND_WRQ)
 455                 return;
 456
 457         if (len < 2)
 458                 return;
 459         len -= 2;
 460         /* warning: don't use increment (++) in ntohs() macros!! */
 461         s = (ushort *)pkt;
 462         proto = *s++;
 463         pkt = (uchar *)s;
 464         switch (ntohs(proto)) {
 465
 466         case TFTP_RRQ:
 467                 break;
 468
 469         case TFTP_ACK:
 470 #ifdef CONFIG_CMD_TFTPPUT
 471                 if (TftpWriting) {
 472                         if (TftpFinalBlock) {
 473                                 tftp_complete();
 474                         } else {
 475                                 /*
 476                                  * Move to the next block. We want our block
 477                                  * count to wrap just like the other end!
 478                                  */
 479                                 int block = ntohs(*s);
 480                                 int ack_ok = (TftpBlock == block);
 481
 482                                 TftpBlock = (unsigned short)(block + 1);
 483                                 update_block_number();
 484                                 if (ack_ok)
 485                                         TftpSend(); /* Send next data block */
 486                         }
 487                 }
 488 #endif
 489                 break;
 490
 491         default:
 492                 break;
 493
 494 #ifdef CONFIG_CMD_TFTPSRV
 495         case TFTP_WRQ:
 496                 debug("Got WRQ\n");
 497                 TftpRemoteIP = sip;
 498                 TftpRemotePort = src;
 499                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 500                 new_transfer();
 501                 TftpSend(); /* Send ACK(0) */
 502                 break;
 503 #endif
 504
 505         case TFTP_OACK:
 506                 debug("Got OACK: %s %s\n",
 507                         pkt,
 508                         pkt + strlen((char *)pkt) + 1);
 509                 TftpState = STATE_OACK;
 510                 TftpRemotePort = src;
 511                 /*
 512                  * Check for 'blksize' option.
 513                  * Careful: "i" is signed, "len" is unsigned, thus
 514                  * something like "len-8" may give a *huge* number
 515                  */
 516                 for (i = 0; i+8 < len; i++) {
 517                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 518                                 TftpBlkSize = (unsigned short)
 519                                         simple_strtoul((char *)pkt+i+8, NULL,
 520                                                        10);
 521                                 debug("Blocksize ack: %s, %d\n",
 522                                         (char *)pkt+i+8, TftpBlkSize);
 523                         }
 524 #ifdef CONFIG_TFTP_TSIZE
 525                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 526                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 527                                                            NULL, 10);
 528                                 debug("size = %s, %d\n",
 529                                          (char *)pkt+i+6, TftpTsize);
 530                         }
 531 #endif
 532                 }
 533 #ifdef CONFIG_MCAST_TFTP
 534                 parse_multicast_oack((char *)pkt, len-1);
 535                 if ((Multicast) && (!MasterClient))
 536                         TftpState = STATE_DATA; /* passive.. */
 537                 else
 538 #endif
 539 #ifdef CONFIG_CMD_TFTPPUT
 540                 if (TftpWriting) {
 541                         /* Get ready to send the first block */
 542                         TftpState = STATE_DATA;
 543                         TftpBlock++;
 544                 }
 545 #endif
 546                 TftpSend(); /* Send ACK or first data block */
 547                 break;
 548         case TFTP_DATA:
 549                 if (len < 2)
 550                         return;
 551                 len -= 2;
 552                 TftpBlock = ntohs(*(ushort *)pkt);
 553
 554                 update_block_number();
 555
 556                 if (TftpState == STATE_SEND_RRQ)
 557                         debug("Server did not acknowledge timeout option!\n");
 558
 559                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 560                     TftpState == STATE_RECV_WRQ) {
 561                         /* first block received */
 562                         TftpState = STATE_DATA;
 563                         TftpRemotePort = src;
 564                         new_transfer();
 565
 566 #ifdef CONFIG_MCAST_TFTP
 567                         if (Multicast) { /* start!=1 common if mcast */
 568                                 TftpLastBlock = TftpBlock - 1;
 569                         } else
 570 #endif
 571                         if (TftpBlock != 1) {   /* Assertion */
 572                                 printf("\nTFTP error: "
 573                                        "First block is not block 1 (%ld)\n"
 574                                        "Starting again\n\n",
 575                                         TftpBlock);
 576                                 NetStartAgain();
 577                                 break;
 578                         }
 579                 }
 580
 581                 if (TftpBlock == TftpLastBlock) {
 582                         /*
 583                          *      Same block again; ignore it.
 584                          */
 585                         break;
 586                 }
 587
 588                 TftpLastBlock = TftpBlock;
 589                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 590                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 591
 592                 store_block(TftpBlock - 1, pkt + 2, len);
 593
 594                 /*
 595                  *      Acknowledge the block just received, which will prompt
 596                  *      the remote for the next one.
 597                  */
 598 #ifdef CONFIG_MCAST_TFTP
 599                 /* if I am the MasterClient, actively calculate what my next
 600                  * needed block is; else I'm passive; not ACKING
 601                  */
 602                 if (Multicast) {
 603                         if (len < TftpBlkSize)  {
 604                                 TftpEndingBlock = TftpBlock;
 605                         } else if (MasterClient) {
 606                                 TftpBlock = PrevBitmapHole =
 607                                         ext2_find_next_zero_bit(
 608                                                 Bitmap,
 609                                                 (Mapsize*8),
 610                                                 PrevBitmapHole);
 611                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 612                                         printf("tftpfile too big\n");
 613                                         /* try to double it and retry */
 614                                         Mapsize <<= 1;
 615                                         mcast_cleanup();
 616                                         NetStartAgain();
 617                                         return;
 618                                 }
 619                                 TftpLastBlock = TftpBlock;
 620                         }
 621                 }
 622 #endif
 623                 TftpSend();
 624
 625 #ifdef CONFIG_MCAST_TFTP
 626                 if (Multicast) {
 627                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 628                                 puts("\nMulticast tftp done\n");
 629                                 mcast_cleanup();
 630                                 net_set_state(NETLOOP_SUCCESS);
 631                         }
 632                 } else
 633 #endif
 634                 if (len < TftpBlkSize)
 635                         tftp_complete();
 636                 break;
 637
 638         case TFTP_ERROR:
 639                 printf("\nTFTP error: '%s' (%d)\n",
 640                        pkt + 2, ntohs(*(ushort *)pkt));
 641
 642                 switch (ntohs(*(ushort *)pkt)) {
 643                 case TFTP_ERR_FILE_NOT_FOUND:
 644                 case TFTP_ERR_ACCESS_DENIED:
 645                         puts("Not retrying...\n");
 646                         eth_halt();
 647                         net_set_state(NETLOOP_FAIL);
 648                         break;
 649                 case TFTP_ERR_UNDEFINED:
 650                 case TFTP_ERR_DISK_FULL:
 651                 case TFTP_ERR_UNEXPECTED_OPCODE:
 652                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 653                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 654                 default:
 655                         puts("Starting again\n\n");
 656 #ifdef CONFIG_MCAST_TFTP
 657                         mcast_cleanup();
 658 #endif
 659                         NetStartAgain();
 660                         break;
 661                 }
 662                 break;
 663         }
 664 }
 665
 666
 667 static void
 668 TftpTimeout(void)
 669 {
 670         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 671                 restart("Retry count exceeded");
 672         } else {
 673                 puts("T ");
 674                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 675                 if (TftpState != STATE_RECV_WRQ)
 676                         TftpSend();
 677         }
 678 }
 679
 680
 681 void TftpStart(enum proto_t protocol)
 682 {
 683         char *ep;             /* Environment pointer */
 684
 685         /*
 686          * Allow the user to choose TFTP blocksize and timeout.
 687          * TFTP protocol has a minimal timeout of 1 second.
 688          */
 689         ep = getenv("tftpblocksize");
 690         if (ep != NULL)
 691                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 692
 693         ep = getenv("tftptimeout");
 694         if (ep != NULL)
 695                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 696
 697         if (TftpTimeoutMSecs < 1000) {
 698                 printf("TFTP timeout (%ld ms) too low, "
 699                         "set minimum = 1000 ms\n",
 700                         TftpTimeoutMSecs);
 701                 TftpTimeoutMSecs = 1000;
 702         }
 703
 704         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 705                 TftpBlkSizeOption, TftpTimeoutMSecs);
 706
 707         TftpRemoteIP = NetServerIP;
 708         if (BootFile[0] == '\0') {
 709                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 710                         NetOurIP & 0xFF,
 711                         (NetOurIP >>  8) & 0xFF,
 712                         (NetOurIP >> 16) & 0xFF,
 713                         (NetOurIP >> 24) & 0xFF);
 714
 715                 strncpy(tftp_filename, default_filename, MAX_LEN);
 716                 tftp_filename[MAX_LEN-1] = 0;
 717
 718                 printf("*** Warning: no boot file name; using '%s'\n",
 719                         tftp_filename);
 720         } else {
 721                 char *p = strchr(BootFile, ':');
 722
 723                 if (p == NULL) {
 724                         strncpy(tftp_filename, BootFile, MAX_LEN);
 725                         tftp_filename[MAX_LEN-1] = 0;
 726                 } else {
 727                         TftpRemoteIP = string_to_ip(BootFile);
 728                         strncpy(tftp_filename, p + 1, MAX_LEN);
 729                         tftp_filename[MAX_LEN-1] = 0;
 730                 }
 731         }
 732
 733         printf("Using %s device\n", eth_get_name());
 734         printf("TFTP %s server %pI4; our IP address is %pI4",
 735 #ifdef CONFIG_CMD_TFTPPUT
 736                protocol == TFTPPUT ? "to" : "from",
 737 #else
 738                 "from",
 739 #endif
 740                 &TftpRemoteIP, &NetOurIP);
 741
 742         /* Check if we need to send across this subnet */
 743         if (NetOurGatewayIP && NetOurSubnetMask) {
 744                 IPaddr_t OurNet = NetOurIP    & NetOurSubnetMask;
 745                 IPaddr_t RemoteNet      = TftpRemoteIP & NetOurSubnetMask;
 746
 747                 if (OurNet != RemoteNet)
 748                         printf("; sending through gateway %pI4",
 749                                &NetOurGatewayIP);
 750         }
 751         putc('\n');
 752
 753         printf("Filename '%s'.", tftp_filename);
 754
 755         if (NetBootFileSize) {
 756                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 757                 print_size(NetBootFileSize<<9, "");
 758         }
 759
 760         putc('\n');
 761 #ifdef CONFIG_CMD_TFTPPUT
 762         TftpWriting = (protocol == TFTPPUT);
 763         if (TftpWriting) {
 764                 printf("Save address: 0x%lx\n", save_addr);
 765                 printf("Save size:    0x%lx\n", save_size);
 766                 NetBootFileXferSize = save_size;
 767                 puts("Saving: *\b");
 768                 TftpState = STATE_SEND_WRQ;
 769                 new_transfer();
 770         } else
 771 #endif
 772         {
 773                 printf("Load address: 0x%lx\n", load_addr);
 774                 puts("Loading: *\b");
 775                 TftpState = STATE_SEND_RRQ;
 776         }
 777
 778         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 779
 780         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 781         net_set_udp_handler(TftpHandler);
 782 #ifdef CONFIG_CMD_TFTPPUT
 783         net_set_icmp_handler(icmp_handler);
 784 #endif
 785         TftpRemotePort = WELL_KNOWN_PORT;
 786         TftpTimeoutCount = 0;
 787         /* Use a pseudo-random port unless a specific port is set */
 788         TftpOurPort = 1024 + (get_timer(0) % 3072);
 789
 790 #ifdef CONFIG_TFTP_PORT
 791         ep = getenv("tftpdstp");
 792         if (ep != NULL)
 793                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 794         ep = getenv("tftpsrcp");
 795         if (ep != NULL)
 796                 TftpOurPort = simple_strtol(ep, NULL, 10);
 797 #endif
 798         TftpBlock = 0;
 799
 800         /* zero out server ether in case the server ip has changed */
 801         memset(NetServerEther, 0, 6);
 802         /* Revert TftpBlkSize to dflt */
 803         TftpBlkSize = TFTP_BLOCK_SIZE;
 804 #ifdef CONFIG_MCAST_TFTP
 805         mcast_cleanup();
 806 #endif
 807 #ifdef CONFIG_TFTP_TSIZE
 808         TftpTsize = 0;
 809         TftpNumchars = 0;
 810 #endif
 811
 812         TftpSend();
 813 }
 814
 815 #ifdef CONFIG_CMD_TFTPSRV
 816 void
 817 TftpStartServer(void)
 818 {
 819         tftp_filename[0] = 0;
 820
 821         printf("Using %s device\n", eth_get_name());
 822         printf("Listening for TFTP transfer on %pI4\n", &NetOurIP);
 823         printf("Load address: 0x%lx\n", load_addr);
 824
 825         puts("Loading: *\b");
 826
 827         TftpTimeoutCountMax = TIMEOUT_COUNT;
 828         TftpTimeoutCount = 0;
 829         TftpTimeoutMSecs = TIMEOUT;
 830         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 831
 832         /* Revert TftpBlkSize to dflt */
 833         TftpBlkSize = TFTP_BLOCK_SIZE;
 834         TftpBlock = 0;
 835         TftpOurPort = WELL_KNOWN_PORT;
 836
 837 #ifdef CONFIG_TFTP_TSIZE
 838         TftpTsize = 0;
 839         TftpNumchars = 0;
 840 #endif
 841
 842         TftpState = STATE_RECV_WRQ;
 843         net_set_udp_handler(TftpHandler);
 844 }
 845 #endif /* CONFIG_CMD_TFTPSRV */
 846
 847 #ifdef CONFIG_MCAST_TFTP
 848 /* Credits: atftp project.
 849  */
 850
 851 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 852  * Frame:
 853  *    +-------+-----------+---+-------~~-------+---+
 854  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 855  *    +-------+-----------+---+-------~~-------+---+
 856  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 857  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 858  * master-client, I'm a passive client, gathering what DataBlocks I may and
 859  * making note of which ones I got in my bitmask.
 860  * In theory, I never go from master->passive..
 861  * .. this comes in with pkt already pointing just past opc
 862  */
 863 static void parse_multicast_oack(char *pkt, int len)
 864 {
 865         int i;
 866         IPaddr_t addr;
 867         char *mc_adr, *port,  *mc;
 868
 869         mc_adr = port = mc = NULL;
 870         /* march along looking for 'multicast\0', which has to start at least
 871          * 14 bytes back from the end.
 872          */
 873         for (i = 0; i < len-14; i++)
 874                 if (strcmp(pkt+i, "multicast") == 0)
 875                         break;
 876         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 877                 return;
 878
 879         i += 10; /* strlen multicast */
 880         mc_adr = pkt+i;
 881         for (; i < len; i++) {
 882                 if (*(pkt+i) == ',') {
 883                         *(pkt+i) = '\0';
 884                         if (port) {
 885                                 mc = pkt+i+1;
 886                                 break;
 887                         } else {
 888                                 port = pkt+i+1;
 889                         }
 890                 }
 891         }
 892         if (!port || !mc_adr || !mc)
 893                 return;
 894         if (Multicast && MasterClient) {
 895                 printf("I got a OACK as master Client, WRONG!\n");
 896                 return;
 897         }
 898         /* ..I now accept packets destined for this MCAST addr, port */
 899         if (!Multicast) {
 900                 if (Bitmap) {
 901                         printf("Internal failure! no mcast.\n");
 902                         free(Bitmap);
 903                         Bitmap = NULL;
 904                         ProhibitMcast = 1;
 905                         return ;
 906                 }
 907                 /* I malloc instead of pre-declare; so that if the file ends
 908                  * up being too big for this bitmap I can retry
 909                  */
 910                 Bitmap = malloc(Mapsize);
 911                 if (!Bitmap) {
 912                         printf("No Bitmap, no multicast. Sorry.\n");
 913                         ProhibitMcast = 1;
 914                         return;
 915                 }
 916                 memset(Bitmap, 0, Mapsize);
 917                 PrevBitmapHole = 0;
 918                 Multicast = 1;
 919         }
 920         addr = string_to_ip(mc_adr);
 921         if (Mcast_addr != addr) {
 922                 if (Mcast_addr)
 923                         eth_mcast_join(Mcast_addr, 0);
 924                 Mcast_addr = addr;
 925                 if (eth_mcast_join(Mcast_addr, 1)) {
 926                         printf("Fail to set mcast, revert to TFTP\n");
 927                         ProhibitMcast = 1;
 928                         mcast_cleanup();
 929                         NetStartAgain();
 930                 }
 931         }
 932         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 933         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 934         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 935         return;
 936 }
 937
 938 #endif /* Multicast TFTP */