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 <mapmem.h>
  12 #include <net.h>
  13 #include "tftp.h"
  14 #include "bootp.h"
  15 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
  16 #include <flash.h>
  17 #endif
  18
  19 /* Well known TFTP port # */
  20 #define WELL_KNOWN_PORT 69
  21 /* Millisecs to timeout for lost pkt */
  22 #define TIMEOUT         5000UL
  23 #ifndef CONFIG_NET_RETRY_COUNT
  24 /* # of timeouts before giving up */
  25 # define TIMEOUT_COUNT  10
  26 #else
  27 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  28 #endif
  29 /* Number of "loading" hashes per line (for checking the image size) */
  30 #define HASHES_PER_LINE 65
  31
  32 /*
  33  *      TFTP operations.
  34  */
  35 #define TFTP_RRQ        1
  36 #define TFTP_WRQ        2
  37 #define TFTP_DATA       3
  38 #define TFTP_ACK        4
  39 #define TFTP_ERROR      5
  40 #define TFTP_OACK       6
  41
  42 static ulong TftpTimeoutMSecs = TIMEOUT;
  43 static int TftpTimeoutCountMax = TIMEOUT_COUNT;
  44 static ulong time_start;   /* Record time we started tftp */
  45
  46 /*
  47  * These globals govern the timeout behavior when attempting a connection to a
  48  * TFTP server. TftpRRQTimeoutMSecs specifies the number of milliseconds to
  49  * wait for the server to respond to initial connection. Second global,
  50  * TftpRRQTimeoutCountMax, gives the number of such connection retries.
  51  * TftpRRQTimeoutCountMax must be non-negative and TftpRRQTimeoutMSecs must be
  52  * positive. The globals are meant to be set (and restored) by code needing
  53  * non-standard timeout behavior when initiating a TFTP transfer.
  54  */
  55 ulong TftpRRQTimeoutMSecs = TIMEOUT;
  56 int TftpRRQTimeoutCountMax = TIMEOUT_COUNT;
  57
  58 enum {
  59         TFTP_ERR_UNDEFINED           = 0,
  60         TFTP_ERR_FILE_NOT_FOUND      = 1,
  61         TFTP_ERR_ACCESS_DENIED       = 2,
  62         TFTP_ERR_DISK_FULL           = 3,
  63         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  64         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  65         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  66 };
  67
  68 static struct in_addr tftp_remote_ip;
  69 /* The UDP port at their end */
  70 static int      TftpRemotePort;
  71 /* The UDP port at our end */
  72 static int      TftpOurPort;
  73 static int      TftpTimeoutCount;
  74 /* packet sequence number */
  75 static ulong    TftpBlock;
  76 /* last packet sequence number received */
  77 static ulong    TftpLastBlock;
  78 /* count of sequence number wraparounds */
  79 static ulong    TftpBlockWrap;
  80 /* memory offset due to wrapping */
  81 static ulong    TftpBlockWrapOffset;
  82 static int      TftpState;
  83 #ifdef CONFIG_TFTP_TSIZE
  84 /* The file size reported by the server */
  85 static int      TftpTsize;
  86 /* The number of hashes we printed */
  87 static short    TftpNumchars;
  88 #endif
  89 #ifdef CONFIG_CMD_TFTPPUT
  90 static int      TftpWriting;    /* 1 if writing, else 0 */
  91 static int      TftpFinalBlock; /* 1 if we have sent the last block */
  92 #else
  93 #define TftpWriting     0
  94 #endif
  95
  96 #define STATE_SEND_RRQ  1
  97 #define STATE_DATA      2
  98 #define STATE_TOO_LARGE 3
  99 #define STATE_BAD_MAGIC 4
 100 #define STATE_OACK      5
 101 #define STATE_RECV_WRQ  6
 102 #define STATE_SEND_WRQ  7
 103
 104 /* default TFTP block size */
 105 #define TFTP_BLOCK_SIZE         512
 106 /* sequence number is 16 bit */
 107 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 108
 109 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 110 static char default_filename[DEFAULT_NAME_LEN];
 111
 112 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 113 #define MAX_LEN 128
 114 #else
 115 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 116 #endif
 117
 118 static char tftp_filename[MAX_LEN];
 119
 120 /* 512 is poor choice for ethernet, MTU is typically 1500.
 121  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 122  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 123  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 124  */
 125 #ifdef CONFIG_TFTP_BLOCKSIZE
 126 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 127 #else
 128 #define TFTP_MTU_BLOCKSIZE 1468
 129 #endif
 130
 131 static unsigned short TftpBlkSize = TFTP_BLOCK_SIZE;
 132 static unsigned short TftpBlkSizeOption = TFTP_MTU_BLOCKSIZE;
 133
 134 #ifdef CONFIG_MCAST_TFTP
 135 #include <malloc.h>
 136 #define MTFTP_BITMAPSIZE        0x1000
 137 static unsigned *Bitmap;
 138 static int PrevBitmapHole, Mapsize = MTFTP_BITMAPSIZE;
 139 static uchar ProhibitMcast, MasterClient;
 140 static uchar Multicast;
 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 (net_mcast_addr)
 150                 eth_mcast_join(net_mcast_addr, 0);
 151         if (Bitmap)
 152                 free(Bitmap);
 153         Bitmap = NULL;
 154         net_mcast_addr.s_addr = 0;
 155         Multicast = 0;
 156         Mcast_port = 0;
 157         TftpEndingBlock = -1;
 158 }
 159
 160 #endif  /* CONFIG_MCAST_TFTP */
 161
 162 static inline void
 163 store_block(int block, uchar *src, unsigned len)
 164 {
 165         ulong offset = block * TftpBlkSize + TftpBlockWrapOffset;
 166         ulong newsize = offset + len;
 167 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 168         int i, rc = 0;
 169
 170         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 171                 /* start address in flash? */
 172                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 173                         continue;
 174                 if (load_addr + offset >= flash_info[i].start[0]) {
 175                         rc = 1;
 176                         break;
 177                 }
 178         }
 179
 180         if (rc) { /* Flash is destination for this packet */
 181                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 182                 if (rc) {
 183                         flash_perror(rc);
 184                         net_set_state(NETLOOP_FAIL);
 185                         return;
 186                 }
 187         } else
 188 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 189         {
 190                 void *ptr = map_sysmem(load_addr + offset, len);
 191
 192                 memcpy(ptr, src, len);
 193                 unmap_sysmem(ptr);
 194         }
 195 #ifdef CONFIG_MCAST_TFTP
 196         if (Multicast)
 197                 ext2_set_bit(block, Bitmap);
 198 #endif
 199
 200         if (net_boot_file_size < newsize)
 201                 net_boot_file_size = newsize;
 202 }
 203
 204 /* Clear our state ready for a new transfer */
 205 static void new_transfer(void)
 206 {
 207         TftpLastBlock = 0;
 208         TftpBlockWrap = 0;
 209         TftpBlockWrapOffset = 0;
 210 #ifdef CONFIG_CMD_TFTPPUT
 211         TftpFinalBlock = 0;
 212 #endif
 213 }
 214
 215 #ifdef CONFIG_CMD_TFTPPUT
 216 /**
 217  * Load the next block from memory to be sent over tftp.
 218  *
 219  * @param block Block number to send
 220  * @param dst   Destination buffer for data
 221  * @param len   Number of bytes in block (this one and every other)
 222  * @return number of bytes loaded
 223  */
 224 static int load_block(unsigned block, uchar *dst, unsigned len)
 225 {
 226         /* We may want to get the final block from the previous set */
 227         ulong offset = ((int)block - 1) * len + TftpBlockWrapOffset;
 228         ulong tosend = len;
 229
 230         tosend = min(net_boot_file_size - offset, tosend);
 231         (void)memcpy(dst, (void *)(save_addr + offset), tosend);
 232         debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
 233                 block, offset, len, tosend);
 234         return tosend;
 235 }
 236 #endif
 237
 238 static void TftpSend(void);
 239 static void TftpTimeout(void);
 240
 241 /**********************************************************************/
 242
 243 static void show_block_marker(void)
 244 {
 245 #ifdef CONFIG_TFTP_TSIZE
 246         if (TftpTsize) {
 247                 ulong pos = TftpBlock * TftpBlkSize + TftpBlockWrapOffset;
 248
 249                 while (TftpNumchars < pos * 50 / TftpTsize) {
 250                         putc('#');
 251                         TftpNumchars++;
 252                 }
 253         } else
 254 #endif
 255         {
 256                 if (((TftpBlock - 1) % 10) == 0)
 257                         putc('#');
 258                 else if ((TftpBlock % (10 * HASHES_PER_LINE)) == 0)
 259                         puts("\n\t ");
 260         }
 261 }
 262
 263 /**
 264  * restart the current transfer due to an error
 265  *
 266  * @param msg   Message to print for user
 267  */
 268 static void restart(const char *msg)
 269 {
 270         printf("\n%s; starting again\n", msg);
 271 #ifdef CONFIG_MCAST_TFTP
 272         mcast_cleanup();
 273 #endif
 274         NetStartAgain();
 275 }
 276
 277 /*
 278  * Check if the block number has wrapped, and update progress
 279  *
 280  * TODO: The egregious use of global variables in this file should be tidied.
 281  */
 282 static void update_block_number(void)
 283 {
 284         /*
 285          * RFC1350 specifies that the first data packet will
 286          * have sequence number 1. If we receive a sequence
 287          * number of 0 this means that there was a wrap
 288          * around of the (16 bit) counter.
 289          */
 290         if (TftpBlock == 0 && TftpLastBlock != 0) {
 291                 TftpBlockWrap++;
 292                 TftpBlockWrapOffset += TftpBlkSize * TFTP_SEQUENCE_SIZE;
 293                 TftpTimeoutCount = 0; /* we've done well, reset thhe timeout */
 294         } else {
 295                 show_block_marker();
 296         }
 297 }
 298
 299 /* The TFTP get or put is complete */
 300 static void tftp_complete(void)
 301 {
 302 #ifdef CONFIG_TFTP_TSIZE
 303         /* Print hash marks for the last packet received */
 304         while (TftpTsize && TftpNumchars < 49) {
 305                 putc('#');
 306                 TftpNumchars++;
 307         }
 308         puts("  ");
 309         print_size(TftpTsize, "");
 310 #endif
 311         time_start = get_timer(time_start);
 312         if (time_start > 0) {
 313                 puts("\n\t ");  /* Line up with "Loading: " */
 314                 print_size(net_boot_file_size /
 315                         time_start * 1000, "/s");
 316         }
 317         puts("\ndone\n");
 318         net_set_state(NETLOOP_SUCCESS);
 319 }
 320
 321 static void
 322 TftpSend(void)
 323 {
 324         uchar *pkt;
 325         uchar *xp;
 326         int len = 0;
 327         ushort *s;
 328
 329 #ifdef CONFIG_MCAST_TFTP
 330         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 331         if (Multicast
 332          && (TftpState == STATE_DATA)
 333          && (MasterClient == 0))
 334                 return;
 335 #endif
 336         /*
 337          *      We will always be sending some sort of packet, so
 338          *      cobble together the packet headers now.
 339          */
 340         pkt = NetTxPacket + NetEthHdrSize() + IP_UDP_HDR_SIZE;
 341
 342         switch (TftpState) {
 343         case STATE_SEND_RRQ:
 344         case STATE_SEND_WRQ:
 345                 xp = pkt;
 346                 s = (ushort *)pkt;
 347 #ifdef CONFIG_CMD_TFTPPUT
 348                 *s++ = htons(TftpState == STATE_SEND_RRQ ? TFTP_RRQ :
 349                         TFTP_WRQ);
 350 #else
 351                 *s++ = htons(TFTP_RRQ);
 352 #endif
 353                 pkt = (uchar *)s;
 354                 strcpy((char *)pkt, tftp_filename);
 355                 pkt += strlen(tftp_filename) + 1;
 356                 strcpy((char *)pkt, "octet");
 357                 pkt += 5 /*strlen("octet")*/ + 1;
 358                 strcpy((char *)pkt, "timeout");
 359                 pkt += 7 /*strlen("timeout")*/ + 1;
 360                 sprintf((char *)pkt, "%lu", TftpTimeoutMSecs / 1000);
 361                 debug("send option \"timeout %s\"\n", (char *)pkt);
 362                 pkt += strlen((char *)pkt) + 1;
 363 #ifdef CONFIG_TFTP_TSIZE
 364                 pkt += sprintf((char *)pkt, "tsize%c%u%c",
 365                                 0, net_boot_file_size, 0);
 366 #endif
 367                 /* try for more effic. blk size */
 368                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 369                                 0, TftpBlkSizeOption, 0);
 370 #ifdef CONFIG_MCAST_TFTP
 371                 /* Check all preconditions before even trying the option */
 372                 if (!ProhibitMcast) {
 373                         Bitmap = malloc(Mapsize);
 374                         if (Bitmap && eth_get_dev()->mcast) {
 375                                 free(Bitmap);
 376                                 Bitmap = NULL;
 377                                 pkt += sprintf((char *)pkt, "multicast%c%c",
 378                                         0, 0);
 379                         }
 380                 }
 381 #endif /* CONFIG_MCAST_TFTP */
 382                 len = pkt - xp;
 383                 break;
 384
 385         case STATE_OACK:
 386 #ifdef CONFIG_MCAST_TFTP
 387                 /* My turn!  Start at where I need blocks I missed.*/
 388                 if (Multicast)
 389                         TftpBlock = ext2_find_next_zero_bit(Bitmap,
 390                                                             (Mapsize*8), 0);
 391                 /*..falling..*/
 392 #endif
 393
 394         case STATE_RECV_WRQ:
 395         case STATE_DATA:
 396                 xp = pkt;
 397                 s = (ushort *)pkt;
 398                 s[0] = htons(TFTP_ACK);
 399                 s[1] = htons(TftpBlock);
 400                 pkt = (uchar *)(s + 2);
 401 #ifdef CONFIG_CMD_TFTPPUT
 402                 if (TftpWriting) {
 403                         int toload = TftpBlkSize;
 404                         int loaded = load_block(TftpBlock, pkt, toload);
 405
 406                         s[0] = htons(TFTP_DATA);
 407                         pkt += loaded;
 408                         TftpFinalBlock = (loaded < toload);
 409                 }
 410 #endif
 411                 len = pkt - xp;
 412                 break;
 413
 414         case STATE_TOO_LARGE:
 415                 xp = pkt;
 416                 s = (ushort *)pkt;
 417                 *s++ = htons(TFTP_ERROR);
 418                         *s++ = htons(3);
 419
 420                 pkt = (uchar *)s;
 421                 strcpy((char *)pkt, "File too large");
 422                 pkt += 14 /*strlen("File too large")*/ + 1;
 423                 len = pkt - xp;
 424                 break;
 425
 426         case STATE_BAD_MAGIC:
 427                 xp = pkt;
 428                 s = (ushort *)pkt;
 429                 *s++ = htons(TFTP_ERROR);
 430                 *s++ = htons(2);
 431                 pkt = (uchar *)s;
 432                 strcpy((char *)pkt, "File has bad magic");
 433                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 434                 len = pkt - xp;
 435                 break;
 436         }
 437
 438         NetSendUDPPacket(net_server_ethaddr, tftp_remote_ip, TftpRemotePort,
 439                          TftpOurPort, len);
 440 }
 441
 442 #ifdef CONFIG_CMD_TFTPPUT
 443 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 444                          struct in_addr sip, unsigned src, uchar *pkt,
 445                          unsigned len)
 446 {
 447         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 448                 /* Oh dear the other end has gone away */
 449                 restart("TFTP server died");
 450         }
 451 }
 452 #endif
 453
 454 static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 455                          unsigned src, unsigned len)
 456 {
 457         __be16 proto;
 458         __be16 *s;
 459         int i;
 460
 461         if (dest != TftpOurPort) {
 462 #ifdef CONFIG_MCAST_TFTP
 463                 if (Multicast
 464                  && (!Mcast_port || (dest != Mcast_port)))
 465 #endif
 466                         return;
 467         }
 468         if (TftpState != STATE_SEND_RRQ && src != TftpRemotePort &&
 469             TftpState != STATE_RECV_WRQ && TftpState != STATE_SEND_WRQ)
 470                 return;
 471
 472         if (len < 2)
 473                 return;
 474         len -= 2;
 475         /* warning: don't use increment (++) in ntohs() macros!! */
 476         s = (__be16 *)pkt;
 477         proto = *s++;
 478         pkt = (uchar *)s;
 479         switch (ntohs(proto)) {
 480
 481         case TFTP_RRQ:
 482                 break;
 483
 484         case TFTP_ACK:
 485 #ifdef CONFIG_CMD_TFTPPUT
 486                 if (TftpWriting) {
 487                         if (TftpFinalBlock) {
 488                                 tftp_complete();
 489                         } else {
 490                                 /*
 491                                  * Move to the next block. We want our block
 492                                  * count to wrap just like the other end!
 493                                  */
 494                                 int block = ntohs(*s);
 495                                 int ack_ok = (TftpBlock == block);
 496
 497                                 TftpBlock = (unsigned short)(block + 1);
 498                                 update_block_number();
 499                                 if (ack_ok)
 500                                         TftpSend(); /* Send next data block */
 501                         }
 502                 }
 503 #endif
 504                 break;
 505
 506         default:
 507                 break;
 508
 509 #ifdef CONFIG_CMD_TFTPSRV
 510         case TFTP_WRQ:
 511                 debug("Got WRQ\n");
 512                 tftp_remote_ip = sip;
 513                 TftpRemotePort = src;
 514                 TftpOurPort = 1024 + (get_timer(0) % 3072);
 515                 new_transfer();
 516                 TftpSend(); /* Send ACK(0) */
 517                 break;
 518 #endif
 519
 520         case TFTP_OACK:
 521                 debug("Got OACK: %s %s\n",
 522                         pkt,
 523                         pkt + strlen((char *)pkt) + 1);
 524                 TftpState = STATE_OACK;
 525                 TftpRemotePort = src;
 526                 /*
 527                  * Check for 'blksize' option.
 528                  * Careful: "i" is signed, "len" is unsigned, thus
 529                  * something like "len-8" may give a *huge* number
 530                  */
 531                 for (i = 0; i+8 < len; i++) {
 532                         if (strcmp((char *)pkt+i, "blksize") == 0) {
 533                                 TftpBlkSize = (unsigned short)
 534                                         simple_strtoul((char *)pkt+i+8, NULL,
 535                                                        10);
 536                                 debug("Blocksize ack: %s, %d\n",
 537                                         (char *)pkt+i+8, TftpBlkSize);
 538                         }
 539 #ifdef CONFIG_TFTP_TSIZE
 540                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 541                                 TftpTsize = simple_strtoul((char *)pkt+i+6,
 542                                                            NULL, 10);
 543                                 debug("size = %s, %d\n",
 544                                          (char *)pkt+i+6, TftpTsize);
 545                         }
 546 #endif
 547                 }
 548 #ifdef CONFIG_MCAST_TFTP
 549                 parse_multicast_oack((char *)pkt, len-1);
 550                 if ((Multicast) && (!MasterClient))
 551                         TftpState = STATE_DATA; /* passive.. */
 552                 else
 553 #endif
 554 #ifdef CONFIG_CMD_TFTPPUT
 555                 if (TftpWriting) {
 556                         /* Get ready to send the first block */
 557                         TftpState = STATE_DATA;
 558                         TftpBlock++;
 559                 }
 560 #endif
 561                 TftpSend(); /* Send ACK or first data block */
 562                 break;
 563         case TFTP_DATA:
 564                 if (len < 2)
 565                         return;
 566                 len -= 2;
 567                 TftpBlock = ntohs(*(__be16 *)pkt);
 568
 569                 update_block_number();
 570
 571                 if (TftpState == STATE_SEND_RRQ)
 572                         debug("Server did not acknowledge timeout option!\n");
 573
 574                 if (TftpState == STATE_SEND_RRQ || TftpState == STATE_OACK ||
 575                     TftpState == STATE_RECV_WRQ) {
 576                         /* first block received */
 577                         TftpState = STATE_DATA;
 578                         TftpRemotePort = src;
 579                         new_transfer();
 580
 581 #ifdef CONFIG_MCAST_TFTP
 582                         if (Multicast) { /* start!=1 common if mcast */
 583                                 TftpLastBlock = TftpBlock - 1;
 584                         } else
 585 #endif
 586                         if (TftpBlock != 1) {   /* Assertion */
 587                                 printf("\nTFTP error: "
 588                                        "First block is not block 1 (%ld)\n"
 589                                        "Starting again\n\n",
 590                                         TftpBlock);
 591                                 NetStartAgain();
 592                                 break;
 593                         }
 594                 }
 595
 596                 if (TftpBlock == TftpLastBlock) {
 597                         /*
 598                          *      Same block again; ignore it.
 599                          */
 600                         break;
 601                 }
 602
 603                 TftpLastBlock = TftpBlock;
 604                 TftpTimeoutCountMax = TIMEOUT_COUNT;
 605                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 606
 607                 store_block(TftpBlock - 1, pkt + 2, len);
 608
 609                 /*
 610                  *      Acknowledge the block just received, which will prompt
 611                  *      the remote for the next one.
 612                  */
 613 #ifdef CONFIG_MCAST_TFTP
 614                 /* if I am the MasterClient, actively calculate what my next
 615                  * needed block is; else I'm passive; not ACKING
 616                  */
 617                 if (Multicast) {
 618                         if (len < TftpBlkSize)  {
 619                                 TftpEndingBlock = TftpBlock;
 620                         } else if (MasterClient) {
 621                                 TftpBlock = PrevBitmapHole =
 622                                         ext2_find_next_zero_bit(
 623                                                 Bitmap,
 624                                                 (Mapsize*8),
 625                                                 PrevBitmapHole);
 626                                 if (TftpBlock > ((Mapsize*8) - 1)) {
 627                                         printf("tftpfile too big\n");
 628                                         /* try to double it and retry */
 629                                         Mapsize <<= 1;
 630                                         mcast_cleanup();
 631                                         NetStartAgain();
 632                                         return;
 633                                 }
 634                                 TftpLastBlock = TftpBlock;
 635                         }
 636                 }
 637 #endif
 638                 TftpSend();
 639
 640 #ifdef CONFIG_MCAST_TFTP
 641                 if (Multicast) {
 642                         if (MasterClient && (TftpBlock >= TftpEndingBlock)) {
 643                                 puts("\nMulticast tftp done\n");
 644                                 mcast_cleanup();
 645                                 net_set_state(NETLOOP_SUCCESS);
 646                         }
 647                 } else
 648 #endif
 649                 if (len < TftpBlkSize)
 650                         tftp_complete();
 651                 break;
 652
 653         case TFTP_ERROR:
 654                 printf("\nTFTP error: '%s' (%d)\n",
 655                        pkt + 2, ntohs(*(__be16 *)pkt));
 656
 657                 switch (ntohs(*(__be16 *)pkt)) {
 658                 case TFTP_ERR_FILE_NOT_FOUND:
 659                 case TFTP_ERR_ACCESS_DENIED:
 660                         puts("Not retrying...\n");
 661                         eth_halt();
 662                         net_set_state(NETLOOP_FAIL);
 663                         break;
 664                 case TFTP_ERR_UNDEFINED:
 665                 case TFTP_ERR_DISK_FULL:
 666                 case TFTP_ERR_UNEXPECTED_OPCODE:
 667                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 668                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 669                 default:
 670                         puts("Starting again\n\n");
 671 #ifdef CONFIG_MCAST_TFTP
 672                         mcast_cleanup();
 673 #endif
 674                         NetStartAgain();
 675                         break;
 676                 }
 677                 break;
 678         }
 679 }
 680
 681
 682 static void
 683 TftpTimeout(void)
 684 {
 685         if (++TftpTimeoutCount > TftpTimeoutCountMax) {
 686                 restart("Retry count exceeded");
 687         } else {
 688                 puts("T ");
 689                 NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 690                 if (TftpState != STATE_RECV_WRQ)
 691                         TftpSend();
 692         }
 693 }
 694
 695
 696 void TftpStart(enum proto_t protocol)
 697 {
 698         char *ep;             /* Environment pointer */
 699
 700         /*
 701          * Allow the user to choose TFTP blocksize and timeout.
 702          * TFTP protocol has a minimal timeout of 1 second.
 703          */
 704         ep = getenv("tftpblocksize");
 705         if (ep != NULL)
 706                 TftpBlkSizeOption = simple_strtol(ep, NULL, 10);
 707
 708         ep = getenv("tftptimeout");
 709         if (ep != NULL)
 710                 TftpTimeoutMSecs = simple_strtol(ep, NULL, 10);
 711
 712         if (TftpTimeoutMSecs < 1000) {
 713                 printf("TFTP timeout (%ld ms) too low, "
 714                         "set minimum = 1000 ms\n",
 715                         TftpTimeoutMSecs);
 716                 TftpTimeoutMSecs = 1000;
 717         }
 718
 719         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 720                 TftpBlkSizeOption, TftpTimeoutMSecs);
 721
 722         tftp_remote_ip = net_server_ip;
 723         if (net_boot_file_name[0] == '\0') {
 724                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 725                         net_ip.s_addr & 0xFF,
 726                         (net_ip.s_addr >>  8) & 0xFF,
 727                         (net_ip.s_addr >> 16) & 0xFF,
 728                         (net_ip.s_addr >> 24) & 0xFF);
 729
 730                 strncpy(tftp_filename, default_filename, MAX_LEN);
 731                 tftp_filename[MAX_LEN-1] = 0;
 732
 733                 printf("*** Warning: no boot file name; using '%s'\n",
 734                         tftp_filename);
 735         } else {
 736                 char *p = strchr(net_boot_file_name, ':');
 737
 738                 if (p == NULL) {
 739                         strncpy(tftp_filename, net_boot_file_name, MAX_LEN);
 740                         tftp_filename[MAX_LEN-1] = 0;
 741                 } else {
 742                         tftp_remote_ip = string_to_ip(net_boot_file_name);
 743                         strncpy(tftp_filename, p + 1, MAX_LEN);
 744                         tftp_filename[MAX_LEN-1] = 0;
 745                 }
 746         }
 747
 748         printf("Using %s device\n", eth_get_name());
 749         printf("TFTP %s server %pI4; our IP address is %pI4",
 750 #ifdef CONFIG_CMD_TFTPPUT
 751                protocol == TFTPPUT ? "to" : "from",
 752 #else
 753                 "from",
 754 #endif
 755                 &tftp_remote_ip, &net_ip);
 756
 757         /* Check if we need to send across this subnet */
 758         if (net_gateway.s_addr && net_netmask.s_addr) {
 759                 struct in_addr our_net;
 760                 struct in_addr remote_net;
 761
 762                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 763                 remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
 764                 if (our_net.s_addr != remote_net.s_addr)
 765                         printf("; sending through gateway %pI4", &net_gateway);
 766         }
 767         putc('\n');
 768
 769         printf("Filename '%s'.", tftp_filename);
 770
 771         if (net_boot_file_expected_size_in_blocks) {
 772                 printf(" Size is 0x%x Bytes = ",
 773                        net_boot_file_expected_size_in_blocks << 9);
 774                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 775         }
 776
 777         putc('\n');
 778 #ifdef CONFIG_CMD_TFTPPUT
 779         TftpWriting = (protocol == TFTPPUT);
 780         if (TftpWriting) {
 781                 printf("Save address: 0x%lx\n", save_addr);
 782                 printf("Save size:    0x%lx\n", save_size);
 783                 net_boot_file_size = save_size;
 784                 puts("Saving: *\b");
 785                 TftpState = STATE_SEND_WRQ;
 786                 new_transfer();
 787         } else
 788 #endif
 789         {
 790                 printf("Load address: 0x%lx\n", load_addr);
 791                 puts("Loading: *\b");
 792                 TftpState = STATE_SEND_RRQ;
 793         }
 794
 795         time_start = get_timer(0);
 796         TftpTimeoutCountMax = TftpRRQTimeoutCountMax;
 797
 798         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 799         net_set_udp_handler(tftp_handler);
 800 #ifdef CONFIG_CMD_TFTPPUT
 801         net_set_icmp_handler(icmp_handler);
 802 #endif
 803         TftpRemotePort = WELL_KNOWN_PORT;
 804         TftpTimeoutCount = 0;
 805         /* Use a pseudo-random port unless a specific port is set */
 806         TftpOurPort = 1024 + (get_timer(0) % 3072);
 807
 808 #ifdef CONFIG_TFTP_PORT
 809         ep = getenv("tftpdstp");
 810         if (ep != NULL)
 811                 TftpRemotePort = simple_strtol(ep, NULL, 10);
 812         ep = getenv("tftpsrcp");
 813         if (ep != NULL)
 814                 TftpOurPort = simple_strtol(ep, NULL, 10);
 815 #endif
 816         TftpBlock = 0;
 817
 818         /* zero out server ether in case the server ip has changed */
 819         memset(net_server_ethaddr, 0, 6);
 820         /* Revert TftpBlkSize to dflt */
 821         TftpBlkSize = TFTP_BLOCK_SIZE;
 822 #ifdef CONFIG_MCAST_TFTP
 823         mcast_cleanup();
 824 #endif
 825 #ifdef CONFIG_TFTP_TSIZE
 826         TftpTsize = 0;
 827         TftpNumchars = 0;
 828 #endif
 829
 830         TftpSend();
 831 }
 832
 833 #ifdef CONFIG_CMD_TFTPSRV
 834 void
 835 TftpStartServer(void)
 836 {
 837         tftp_filename[0] = 0;
 838
 839         printf("Using %s device\n", eth_get_name());
 840         printf("Listening for TFTP transfer on %pI4\n", &net_ip);
 841         printf("Load address: 0x%lx\n", load_addr);
 842
 843         puts("Loading: *\b");
 844
 845         TftpTimeoutCountMax = TIMEOUT_COUNT;
 846         TftpTimeoutCount = 0;
 847         TftpTimeoutMSecs = TIMEOUT;
 848         NetSetTimeout(TftpTimeoutMSecs, TftpTimeout);
 849
 850         /* Revert TftpBlkSize to dflt */
 851         TftpBlkSize = TFTP_BLOCK_SIZE;
 852         TftpBlock = 0;
 853         TftpOurPort = WELL_KNOWN_PORT;
 854
 855 #ifdef CONFIG_TFTP_TSIZE
 856         TftpTsize = 0;
 857         TftpNumchars = 0;
 858 #endif
 859
 860         TftpState = STATE_RECV_WRQ;
 861         net_set_udp_handler(tftp_handler);
 862
 863         /* zero out server ether in case the server ip has changed */
 864         memset(net_server_ethaddr, 0, 6);
 865 }
 866 #endif /* CONFIG_CMD_TFTPSRV */
 867
 868 #ifdef CONFIG_MCAST_TFTP
 869 /* Credits: atftp project.
 870  */
 871
 872 /* pick up BcastAddr, Port, and whether I am [now] the master-client. *
 873  * Frame:
 874  *    +-------+-----------+---+-------~~-------+---+
 875  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 876  *    +-------+-----------+---+-------~~-------+---+
 877  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 878  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 879  * master-client, I'm a passive client, gathering what DataBlocks I may and
 880  * making note of which ones I got in my bitmask.
 881  * In theory, I never go from master->passive..
 882  * .. this comes in with pkt already pointing just past opc
 883  */
 884 static void parse_multicast_oack(char *pkt, int len)
 885 {
 886         int i;
 887         struct in_addr addr;
 888         char *mc_adr, *port,  *mc;
 889
 890         mc_adr = port = mc = NULL;
 891         /* march along looking for 'multicast\0', which has to start at least
 892          * 14 bytes back from the end.
 893          */
 894         for (i = 0; i < len-14; i++)
 895                 if (strcmp(pkt+i, "multicast") == 0)
 896                         break;
 897         if (i >= (len-14)) /* non-Multicast OACK, ign. */
 898                 return;
 899
 900         i += 10; /* strlen multicast */
 901         mc_adr = pkt+i;
 902         for (; i < len; i++) {
 903                 if (*(pkt+i) == ',') {
 904                         *(pkt+i) = '\0';
 905                         if (port) {
 906                                 mc = pkt+i+1;
 907                                 break;
 908                         } else {
 909                                 port = pkt+i+1;
 910                         }
 911                 }
 912         }
 913         if (!port || !mc_adr || !mc)
 914                 return;
 915         if (Multicast && MasterClient) {
 916                 printf("I got a OACK as master Client, WRONG!\n");
 917                 return;
 918         }
 919         /* ..I now accept packets destined for this MCAST addr, port */
 920         if (!Multicast) {
 921                 if (Bitmap) {
 922                         printf("Internal failure! no mcast.\n");
 923                         free(Bitmap);
 924                         Bitmap = NULL;
 925                         ProhibitMcast = 1;
 926                         return ;
 927                 }
 928                 /* I malloc instead of pre-declare; so that if the file ends
 929                  * up being too big for this bitmap I can retry
 930                  */
 931                 Bitmap = malloc(Mapsize);
 932                 if (!Bitmap) {
 933                         printf("No Bitmap, no multicast. Sorry.\n");
 934                         ProhibitMcast = 1;
 935                         return;
 936                 }
 937                 memset(Bitmap, 0, Mapsize);
 938                 PrevBitmapHole = 0;
 939                 Multicast = 1;
 940         }
 941         addr = string_to_ip(mc_adr);
 942         if (net_mcast_addr.s_addr != addr.s_addr) {
 943                 if (net_mcast_addr.s_addr)
 944                         eth_mcast_join(net_mcast_addr, 0);
 945                 net_mcast_addr = addr;
 946                 if (eth_mcast_join(net_mcast_addr, 1)) {
 947                         printf("Fail to set mcast, revert to TFTP\n");
 948                         ProhibitMcast = 1;
 949                         mcast_cleanup();
 950                         NetStartAgain();
 951                 }
 952         }
 953         MasterClient = (unsigned char)simple_strtoul((char *)mc, NULL, 10);
 954         Mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 955         printf("Multicast: %s:%d [%d]\n", mc_adr, Mcast_port, MasterClient);
 956         return;
 957 }
 958
 959 #endif /* Multicast TFTP */