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