net/tftp.c

   1 /*
   2  * Copyright 1994, 1995, 2000 Neil Russell.
   3  * (See License)
   4  * Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, [email protected]
   5  * Copyright 2011 Comelit Group SpA,
   6  *                Luca Ceresoli <[email protected]>
   7  */
   8 #include <common.h>
   9 #include <command.h>
  10 #include <efi_loader.h>
  11 #include <env.h>
  12 #include <image.h>
  13 #include <lmb.h>
  14 #include <log.h>
  15 #include <mapmem.h>
  16 #include <net.h>
  17 #include <net/tftp.h>
  18 #include "bootp.h"
  19 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
  20 #include <flash.h>
  21 #endif
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 /* Well known TFTP port # */
  26 #define WELL_KNOWN_PORT 69
  27 /* Millisecs to timeout for lost pkt */
  28 #define TIMEOUT         5000UL
  29 #ifndef CONFIG_NET_RETRY_COUNT
  30 /* # of timeouts before giving up */
  31 # define TIMEOUT_COUNT  10
  32 #else
  33 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  34 #endif
  35 /* Number of "loading" hashes per line (for checking the image size) */
  36 #define HASHES_PER_LINE 65
  37
  38 /*
  39  *      TFTP operations.
  40  */
  41 #define TFTP_RRQ        1
  42 #define TFTP_WRQ        2
  43 #define TFTP_DATA       3
  44 #define TFTP_ACK        4
  45 #define TFTP_ERROR      5
  46 #define TFTP_OACK       6
  47
  48 static ulong timeout_ms = TIMEOUT;
  49 static int timeout_count_max = TIMEOUT_COUNT;
  50 static ulong time_start;   /* Record time we started tftp */
  51
  52 /*
  53  * These globals govern the timeout behavior when attempting a connection to a
  54  * TFTP server. tftp_timeout_ms specifies the number of milliseconds to
  55  * wait for the server to respond to initial connection. Second global,
  56  * tftp_timeout_count_max, gives the number of such connection retries.
  57  * tftp_timeout_count_max must be non-negative and tftp_timeout_ms must be
  58  * positive. The globals are meant to be set (and restored) by code needing
  59  * non-standard timeout behavior when initiating a TFTP transfer.
  60  */
  61 ulong tftp_timeout_ms = TIMEOUT;
  62 int tftp_timeout_count_max = TIMEOUT_COUNT;
  63
  64 enum {
  65         TFTP_ERR_UNDEFINED           = 0,
  66         TFTP_ERR_FILE_NOT_FOUND      = 1,
  67         TFTP_ERR_ACCESS_DENIED       = 2,
  68         TFTP_ERR_DISK_FULL           = 3,
  69         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  70         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  71         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  72         TFTP_ERR_OPTION_NEGOTIATION = 8,
  73 };
  74
  75 static struct in_addr tftp_remote_ip;
  76 /* The UDP port at their end */
  77 static int      tftp_remote_port;
  78 /* The UDP port at our end */
  79 static int      tftp_our_port;
  80 static int      timeout_count;
  81 /* packet sequence number */
  82 static ulong    tftp_cur_block;
  83 /* last packet sequence number received */
  84 static ulong    tftp_prev_block;
  85 /* count of sequence number wraparounds */
  86 static ulong    tftp_block_wrap;
  87 /* memory offset due to wrapping */
  88 static ulong    tftp_block_wrap_offset;
  89 static int      tftp_state;
  90 static ulong    tftp_load_addr;
  91 #ifdef CONFIG_LMB
  92 static ulong    tftp_load_size;
  93 #endif
  94 #ifdef CONFIG_TFTP_TSIZE
  95 /* The file size reported by the server */
  96 static int      tftp_tsize;
  97 /* The number of hashes we printed */
  98 static short    tftp_tsize_num_hash;
  99 #endif
 100 /* The window size negotiated */
 101 static ushort   tftp_windowsize;
 102 /* Next block to send ack to */
 103 static ushort   tftp_next_ack;
 104 /* Last nack block we send */
 105 static ushort   tftp_last_nack;
 106 #ifdef CONFIG_CMD_TFTPPUT
 107 /* 1 if writing, else 0 */
 108 static int      tftp_put_active;
 109 /* 1 if we have sent the last block */
 110 static int      tftp_put_final_block_sent;
 111 #else
 112 #define tftp_put_active 0
 113 #endif
 114
 115 #define STATE_SEND_RRQ  1
 116 #define STATE_DATA      2
 117 #define STATE_TOO_LARGE 3
 118 #define STATE_BAD_MAGIC 4
 119 #define STATE_OACK      5
 120 #define STATE_RECV_WRQ  6
 121 #define STATE_SEND_WRQ  7
 122 #define STATE_INVALID_OPTION    8
 123
 124 /* default TFTP block size */
 125 #define TFTP_BLOCK_SIZE         512
 126 /* sequence number is 16 bit */
 127 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 128
 129 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 130 static char default_filename[DEFAULT_NAME_LEN];
 131
 132 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 133 #define MAX_LEN 128
 134 #else
 135 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 136 #endif
 137
 138 static char tftp_filename[MAX_LEN];
 139
 140 /* 512 is poor choice for ethernet, MTU is typically 1500.
 141  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 142  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 143  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 144  */
 145
 146 /* When windowsize is defined to 1,
 147  * tftp behaves the same way as it was
 148  * never declared
 149  */
 150 #ifdef CONFIG_TFTP_WINDOWSIZE
 151 #define TFTP_WINDOWSIZE CONFIG_TFTP_WINDOWSIZE
 152 #else
 153 #define TFTP_WINDOWSIZE 1
 154 #endif
 155
 156 static unsigned short tftp_block_size = TFTP_BLOCK_SIZE;
 157 static unsigned short tftp_block_size_option = CONFIG_TFTP_BLOCKSIZE;
 158 static unsigned short tftp_window_size_option = TFTP_WINDOWSIZE;
 159
 160 static inline int store_block(int block, uchar *src, unsigned int len)
 161 {
 162         ulong offset = block * tftp_block_size + tftp_block_wrap_offset;
 163         ulong newsize = offset + len;
 164         ulong store_addr = tftp_load_addr + offset;
 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 (store_addr >= 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, store_addr, len);
 180                 if (rc) {
 181                         flash_perror(rc);
 182                         return rc;
 183                 }
 184         } else
 185 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 186         {
 187                 void *ptr;
 188
 189 #ifdef CONFIG_LMB
 190                 ulong end_addr = tftp_load_addr + tftp_load_size;
 191
 192                 if (!end_addr)
 193                         end_addr = ULONG_MAX;
 194
 195                 if (store_addr < tftp_load_addr ||
 196                     store_addr + len > end_addr) {
 197                         puts("\nTFTP error: ");
 198                         puts("trying to overwrite reserved memory...\n");
 199                         return -1;
 200                 }
 201 #endif
 202                 ptr = map_sysmem(store_addr, len);
 203                 memcpy(ptr, src, len);
 204                 unmap_sysmem(ptr);
 205         }
 206
 207         if (net_boot_file_size < newsize)
 208                 net_boot_file_size = newsize;
 209
 210         return 0;
 211 }
 212
 213 /* Clear our state ready for a new transfer */
 214 static void new_transfer(void)
 215 {
 216         tftp_prev_block = 0;
 217         tftp_block_wrap = 0;
 218         tftp_block_wrap_offset = 0;
 219 #ifdef CONFIG_CMD_TFTPPUT
 220         tftp_put_final_block_sent = 0;
 221 #endif
 222 }
 223
 224 #ifdef CONFIG_CMD_TFTPPUT
 225 /**
 226  * Load the next block from memory to be sent over tftp.
 227  *
 228  * @param block Block number to send
 229  * @param dst   Destination buffer for data
 230  * @param len   Number of bytes in block (this one and every other)
 231  * @return number of bytes loaded
 232  */
 233 static int load_block(unsigned block, uchar *dst, unsigned len)
 234 {
 235         /* We may want to get the final block from the previous set */
 236         ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
 237         ulong tosend = len;
 238
 239         tosend = min(net_boot_file_size - offset, tosend);
 240         (void)memcpy(dst, (void *)(image_save_addr + offset), tosend);
 241         debug("%s: block=%u, offset=%lu, len=%u, tosend=%lu\n", __func__,
 242               block, offset, len, tosend);
 243         return tosend;
 244 }
 245 #endif
 246
 247 static void tftp_send(void);
 248 static void tftp_timeout_handler(void);
 249
 250 /**********************************************************************/
 251
 252 static void show_block_marker(void)
 253 {
 254         ulong pos;
 255
 256 #ifdef CONFIG_TFTP_TSIZE
 257         if (tftp_tsize) {
 258                 pos = tftp_cur_block * tftp_block_size +
 259                         tftp_block_wrap_offset;
 260                 if (pos > tftp_tsize)
 261                         pos = tftp_tsize;
 262
 263                 while (tftp_tsize_num_hash < pos * 50 / tftp_tsize) {
 264                         putc('#');
 265                         tftp_tsize_num_hash++;
 266                 }
 267         } else
 268 #endif
 269         {
 270                 pos = (tftp_cur_block - 1) +
 271                         (tftp_block_wrap * TFTP_SEQUENCE_SIZE);
 272                 if ((pos % 10) == 0)
 273                         putc('#');
 274                 else if (((pos + 1) % (10 * HASHES_PER_LINE)) == 0)
 275                         puts("\n\t ");
 276         }
 277 }
 278
 279 /**
 280  * restart the current transfer due to an error
 281  *
 282  * @param msg   Message to print for user
 283  */
 284 static void restart(const char *msg)
 285 {
 286         printf("\n%s; starting again\n", msg);
 287         net_start_again();
 288 }
 289
 290 /*
 291  * Check if the block number has wrapped, and update progress
 292  *
 293  * TODO: The egregious use of global variables in this file should be tidied.
 294  */
 295 static void update_block_number(void)
 296 {
 297         /*
 298          * RFC1350 specifies that the first data packet will
 299          * have sequence number 1. If we receive a sequence
 300          * number of 0 this means that there was a wrap
 301          * around of the (16 bit) counter.
 302          */
 303         if (tftp_cur_block == 0 && tftp_prev_block != 0) {
 304                 tftp_block_wrap++;
 305                 tftp_block_wrap_offset += tftp_block_size * TFTP_SEQUENCE_SIZE;
 306                 timeout_count = 0; /* we've done well, reset the timeout */
 307         }
 308         show_block_marker();
 309 }
 310
 311 /* The TFTP get or put is complete */
 312 static void tftp_complete(void)
 313 {
 314 #ifdef CONFIG_TFTP_TSIZE
 315         /* Print hash marks for the last packet received */
 316         while (tftp_tsize && tftp_tsize_num_hash < 49) {
 317                 putc('#');
 318                 tftp_tsize_num_hash++;
 319         }
 320         puts("  ");
 321         print_size(tftp_tsize, "");
 322 #endif
 323         time_start = get_timer(time_start);
 324         if (time_start > 0) {
 325                 puts("\n\t ");  /* Line up with "Loading: " */
 326                 print_size(net_boot_file_size /
 327                         time_start * 1000, "/s");
 328         }
 329         puts("\ndone\n");
 330         net_set_state(NETLOOP_SUCCESS);
 331 }
 332
 333 static void tftp_send(void)
 334 {
 335         uchar *pkt;
 336         uchar *xp;
 337         int len = 0;
 338         ushort *s;
 339         bool err_pkt = false;
 340
 341         /*
 342          *      We will always be sending some sort of packet, so
 343          *      cobble together the packet headers now.
 344          */
 345         pkt = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
 346
 347         switch (tftp_state) {
 348         case STATE_SEND_RRQ:
 349         case STATE_SEND_WRQ:
 350                 xp = pkt;
 351                 s = (ushort *)pkt;
 352 #ifdef CONFIG_CMD_TFTPPUT
 353                 *s++ = htons(tftp_state == STATE_SEND_RRQ ? TFTP_RRQ :
 354                         TFTP_WRQ);
 355 #else
 356                 *s++ = htons(TFTP_RRQ);
 357 #endif
 358                 pkt = (uchar *)s;
 359                 strcpy((char *)pkt, tftp_filename);
 360                 pkt += strlen(tftp_filename) + 1;
 361                 strcpy((char *)pkt, "octet");
 362                 pkt += 5 /*strlen("octet")*/ + 1;
 363                 strcpy((char *)pkt, "timeout");
 364                 pkt += 7 /*strlen("timeout")*/ + 1;
 365                 sprintf((char *)pkt, "%lu", timeout_ms / 1000);
 366                 debug("send option \"timeout %s\"\n", (char *)pkt);
 367                 pkt += strlen((char *)pkt) + 1;
 368 #ifdef CONFIG_TFTP_TSIZE
 369                 pkt += sprintf((char *)pkt, "tsize%c%u%c",
 370                                 0, net_boot_file_size, 0);
 371 #endif
 372                 /* try for more effic. blk size */
 373                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 374                                 0, tftp_block_size_option, 0);
 375
 376                 /* try for more effic. window size.
 377                  * Implemented only for tftp get.
 378                  * Don't bother sending if it's 1
 379                  */
 380                 if (tftp_state == STATE_SEND_RRQ && tftp_window_size_option > 1)
 381                         pkt += sprintf((char *)pkt, "windowsize%c%d%c",
 382                                         0, tftp_window_size_option, 0);
 383                 len = pkt - xp;
 384                 break;
 385
 386         case STATE_OACK:
 387
 388         case STATE_RECV_WRQ:
 389         case STATE_DATA:
 390                 xp = pkt;
 391                 s = (ushort *)pkt;
 392                 s[0] = htons(TFTP_ACK);
 393                 s[1] = htons(tftp_cur_block);
 394                 pkt = (uchar *)(s + 2);
 395 #ifdef CONFIG_CMD_TFTPPUT
 396                 if (tftp_put_active) {
 397                         int toload = tftp_block_size;
 398                         int loaded = load_block(tftp_cur_block, pkt, toload);
 399
 400                         s[0] = htons(TFTP_DATA);
 401                         pkt += loaded;
 402                         tftp_put_final_block_sent = (loaded < toload);
 403                 }
 404 #endif
 405                 len = pkt - xp;
 406                 break;
 407
 408         case STATE_TOO_LARGE:
 409                 xp = pkt;
 410                 s = (ushort *)pkt;
 411                 *s++ = htons(TFTP_ERROR);
 412                         *s++ = htons(3);
 413
 414                 pkt = (uchar *)s;
 415                 strcpy((char *)pkt, "File too large");
 416                 pkt += 14 /*strlen("File too large")*/ + 1;
 417                 len = pkt - xp;
 418                 err_pkt = true;
 419                 break;
 420
 421         case STATE_BAD_MAGIC:
 422                 xp = pkt;
 423                 s = (ushort *)pkt;
 424                 *s++ = htons(TFTP_ERROR);
 425                 *s++ = htons(2);
 426                 pkt = (uchar *)s;
 427                 strcpy((char *)pkt, "File has bad magic");
 428                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 429                 len = pkt - xp;
 430                 err_pkt = true;
 431                 break;
 432
 433         case STATE_INVALID_OPTION:
 434                 xp = pkt;
 435                 s = (ushort *)pkt;
 436                 *s++ = htons(TFTP_ERROR);
 437                 *s++ = htons(TFTP_ERR_OPTION_NEGOTIATION);
 438                 pkt = (uchar *)s;
 439                 strcpy((char *)pkt, "Option Negotiation Failed");
 440                 /* strlen("Option Negotiation Failed") + NULL*/
 441                 pkt += 25 + 1;
 442                 len = pkt - xp;
 443                 err_pkt = true;
 444                 break;
 445         }
 446
 447         net_send_udp_packet(net_server_ethaddr, tftp_remote_ip,
 448                             tftp_remote_port, tftp_our_port, len);
 449
 450         if (err_pkt)
 451                 net_set_state(NETLOOP_FAIL);
 452 }
 453
 454 #ifdef CONFIG_CMD_TFTPPUT
 455 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 456                          struct in_addr sip, unsigned src, uchar *pkt,
 457                          unsigned len)
 458 {
 459         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 460                 /* Oh dear the other end has gone away */
 461                 restart("TFTP server died");
 462         }
 463 }
 464 #endif
 465
 466 static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 467                          unsigned src, unsigned len)
 468 {
 469         __be16 proto;
 470         __be16 *s;
 471         int i;
 472         u16 timeout_val_rcvd;
 473
 474         if (dest != tftp_our_port) {
 475                         return;
 476         }
 477         if (tftp_state != STATE_SEND_RRQ && src != tftp_remote_port &&
 478             tftp_state != STATE_RECV_WRQ && tftp_state != STATE_SEND_WRQ)
 479                 return;
 480
 481         if (len < 2)
 482                 return;
 483         len -= 2;
 484         /* warning: don't use increment (++) in ntohs() macros!! */
 485         s = (__be16 *)pkt;
 486         proto = *s++;
 487         pkt = (uchar *)s;
 488         switch (ntohs(proto)) {
 489         case TFTP_RRQ:
 490                 break;
 491
 492         case TFTP_ACK:
 493 #ifdef CONFIG_CMD_TFTPPUT
 494                 if (tftp_put_active) {
 495                         if (tftp_put_final_block_sent) {
 496                                 tftp_complete();
 497                         } else {
 498                                 /*
 499                                  * Move to the next block. We want our block
 500                                  * count to wrap just like the other end!
 501                                  */
 502                                 int block = ntohs(*s);
 503                                 int ack_ok = (tftp_cur_block == block);
 504
 505                                 tftp_cur_block = (unsigned short)(block + 1);
 506                                 update_block_number();
 507                                 if (ack_ok)
 508                                         tftp_send(); /* Send next data block */
 509                         }
 510                 }
 511 #endif
 512                 break;
 513
 514         default:
 515                 break;
 516
 517 #ifdef CONFIG_CMD_TFTPSRV
 518         case TFTP_WRQ:
 519                 debug("Got WRQ\n");
 520                 tftp_remote_ip = sip;
 521                 tftp_remote_port = src;
 522                 tftp_our_port = 1024 + (get_timer(0) % 3072);
 523                 new_transfer();
 524                 tftp_send(); /* Send ACK(0) */
 525                 break;
 526 #endif
 527
 528         case TFTP_OACK:
 529                 debug("Got OACK: ");
 530                 for (i = 0; i < len; i++) {
 531                         if (pkt[i] == '\0')
 532                                 debug(" ");
 533                         else
 534                                 debug("%c", pkt[i]);
 535                 }
 536                 debug("\n");
 537                 tftp_state = STATE_OACK;
 538                 tftp_remote_port = src;
 539                 /*
 540                  * Check for 'blksize' option.
 541                  * Careful: "i" is signed, "len" is unsigned, thus
 542                  * something like "len-8" may give a *huge* number
 543                  */
 544                 for (i = 0; i+8 < len; i++) {
 545                         if (strcasecmp((char *)pkt + i, "blksize") == 0) {
 546                                 tftp_block_size = (unsigned short)
 547                                         simple_strtoul((char *)pkt + i + 8,
 548                                                        NULL, 10);
 549                                 debug("Blocksize oack: %s, %d\n",
 550                                       (char *)pkt + i + 8, tftp_block_size);
 551                                 if (tftp_block_size > tftp_block_size_option) {
 552                                         printf("Invalid blk size(=%d)\n",
 553                                                tftp_block_size);
 554                                         tftp_state = STATE_INVALID_OPTION;
 555                                 }
 556                         }
 557                         if (strcasecmp((char *)pkt + i, "timeout") == 0) {
 558                                 timeout_val_rcvd = (unsigned short)
 559                                         simple_strtoul((char *)pkt + i + 8,
 560                                                        NULL, 10);
 561                                 debug("Timeout oack: %s, %d\n",
 562                                       (char *)pkt + i + 8, timeout_val_rcvd);
 563                                 if (timeout_val_rcvd != (timeout_ms / 1000)) {
 564                                         printf("Invalid timeout val(=%d s)\n",
 565                                                timeout_val_rcvd);
 566                                         tftp_state = STATE_INVALID_OPTION;
 567                                 }
 568                         }
 569 #ifdef CONFIG_TFTP_TSIZE
 570                         if (strcasecmp((char *)pkt + i, "tsize") == 0) {
 571                                 tftp_tsize = simple_strtoul((char *)pkt + i + 6,
 572                                                            NULL, 10);
 573                                 debug("size = %s, %d\n",
 574                                       (char *)pkt + i + 6, tftp_tsize);
 575                         }
 576 #endif
 577                         if (strcasecmp((char *)pkt + i,  "windowsize") == 0) {
 578                                 tftp_windowsize =
 579                                         simple_strtoul((char *)pkt + i + 11,
 580                                                        NULL, 10);
 581                                 debug("windowsize = %s, %d\n",
 582                                       (char *)pkt + i + 11, tftp_windowsize);
 583                         }
 584                 }
 585
 586                 tftp_next_ack = tftp_windowsize;
 587
 588 #ifdef CONFIG_CMD_TFTPPUT
 589                 if (tftp_put_active && tftp_state == STATE_OACK) {
 590                         /* Get ready to send the first block */
 591                         tftp_state = STATE_DATA;
 592                         tftp_cur_block++;
 593                 }
 594 #endif
 595                 tftp_send(); /* Send ACK or first data block */
 596                 break;
 597         case TFTP_DATA:
 598                 if (len < 2)
 599                         return;
 600                 len -= 2;
 601
 602                 if (ntohs(*(__be16 *)pkt) != (ushort)(tftp_cur_block + 1)) {
 603                         debug("Received unexpected block: %d, expected: %d\n",
 604                               ntohs(*(__be16 *)pkt),
 605                               (ushort)(tftp_cur_block + 1));
 606                         /*
 607                          * If one packet is dropped most likely
 608                          * all other buffers in the window
 609                          * that will arrive will cause a sending NACK.
 610                          * This just overwellms the server, let's just send one.
 611                          */
 612                         if (tftp_last_nack != tftp_cur_block) {
 613                                 tftp_send();
 614                                 tftp_last_nack = tftp_cur_block;
 615                                 tftp_next_ack = (ushort)(tftp_cur_block +
 616                                                          tftp_windowsize);
 617                         }
 618                         break;
 619                 }
 620
 621                 tftp_cur_block++;
 622                 tftp_cur_block %= TFTP_SEQUENCE_SIZE;
 623
 624                 if (tftp_state == STATE_SEND_RRQ)
 625                         debug("Server did not acknowledge any options!\n");
 626
 627                 if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK ||
 628                     tftp_state == STATE_RECV_WRQ) {
 629                         /* first block received */
 630                         tftp_state = STATE_DATA;
 631                         tftp_remote_port = src;
 632                         new_transfer();
 633
 634                         if (tftp_cur_block != 1) {      /* Assertion */
 635                                 puts("\nTFTP error: ");
 636                                 printf("First block is not block 1 (%ld)\n",
 637                                        tftp_cur_block);
 638                                 puts("Starting again\n\n");
 639                                 net_start_again();
 640                                 break;
 641                         }
 642                 }
 643
 644                 if (tftp_cur_block == tftp_prev_block) {
 645                         /* Same block again; ignore it. */
 646                         break;
 647                 }
 648
 649                 update_block_number();
 650                 tftp_prev_block = tftp_cur_block;
 651                 timeout_count_max = tftp_timeout_count_max;
 652                 net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 653
 654                 if (store_block(tftp_cur_block - 1, pkt + 2, len)) {
 655                         eth_halt();
 656                         net_set_state(NETLOOP_FAIL);
 657                         break;
 658                 }
 659
 660                 /*
 661                  *      Acknowledge the block just received, which will prompt
 662                  *      the remote for the next one.
 663                  */
 664                 if (tftp_cur_block == tftp_next_ack) {
 665                         tftp_send();
 666                         tftp_next_ack += tftp_windowsize;
 667                 }
 668
 669                 if (len < tftp_block_size) {
 670                         tftp_send();
 671                         tftp_complete();
 672                 }
 673                 break;
 674
 675         case TFTP_ERROR:
 676                 printf("\nTFTP error: '%s' (%d)\n",
 677                        pkt + 2, ntohs(*(__be16 *)pkt));
 678
 679                 switch (ntohs(*(__be16 *)pkt)) {
 680                 case TFTP_ERR_FILE_NOT_FOUND:
 681                 case TFTP_ERR_ACCESS_DENIED:
 682                         puts("Not retrying...\n");
 683                         eth_halt();
 684                         net_set_state(NETLOOP_FAIL);
 685                         break;
 686                 case TFTP_ERR_UNDEFINED:
 687                 case TFTP_ERR_DISK_FULL:
 688                 case TFTP_ERR_UNEXPECTED_OPCODE:
 689                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 690                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 691                 default:
 692                         puts("Starting again\n\n");
 693                         net_start_again();
 694                         break;
 695                 }
 696                 break;
 697         }
 698 }
 699
 700
 701 static void tftp_timeout_handler(void)
 702 {
 703         if (++timeout_count > timeout_count_max) {
 704                 restart("Retry count exceeded");
 705         } else {
 706                 puts("T ");
 707                 net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 708                 if (tftp_state != STATE_RECV_WRQ)
 709                         tftp_send();
 710         }
 711 }
 712
 713 /* Initialize tftp_load_addr and tftp_load_size from image_load_addr and lmb */
 714 static int tftp_init_load_addr(void)
 715 {
 716 #ifdef CONFIG_LMB
 717         struct lmb lmb;
 718         phys_size_t max_size;
 719
 720         lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
 721
 722         max_size = lmb_get_free_size(&lmb, image_load_addr);
 723         if (!max_size)
 724                 return -1;
 725
 726         tftp_load_size = max_size;
 727 #endif
 728         tftp_load_addr = image_load_addr;
 729         return 0;
 730 }
 731
 732 void tftp_start(enum proto_t protocol)
 733 {
 734 #if CONFIG_NET_TFTP_VARS
 735         char *ep;             /* Environment pointer */
 736
 737         /*
 738          * Allow the user to choose TFTP blocksize and timeout.
 739          * TFTP protocol has a minimal timeout of 1 second.
 740          */
 741
 742         ep = env_get("tftpblocksize");
 743         if (ep != NULL)
 744                 tftp_block_size_option = simple_strtol(ep, NULL, 10);
 745
 746         ep = env_get("tftpwindowsize");
 747         if (ep != NULL)
 748                 tftp_window_size_option = simple_strtol(ep, NULL, 10);
 749
 750         ep = env_get("tftptimeout");
 751         if (ep != NULL)
 752                 timeout_ms = simple_strtol(ep, NULL, 10);
 753
 754         if (timeout_ms < 1000) {
 755                 printf("TFTP timeout (%ld ms) too low, set min = 1000 ms\n",
 756                        timeout_ms);
 757                 timeout_ms = 1000;
 758         }
 759
 760         ep = env_get("tftptimeoutcountmax");
 761         if (ep != NULL)
 762                 tftp_timeout_count_max = simple_strtol(ep, NULL, 10);
 763
 764         if (tftp_timeout_count_max < 0) {
 765                 printf("TFTP timeout count max (%d ms) negative, set to 0\n",
 766                        tftp_timeout_count_max);
 767                 tftp_timeout_count_max = 0;
 768         }
 769 #endif
 770
 771         debug("TFTP blocksize = %i, TFTP windowsize = %d timeout = %ld ms\n",
 772               tftp_block_size_option, tftp_window_size_option, timeout_ms);
 773
 774         tftp_remote_ip = net_server_ip;
 775         if (!net_parse_bootfile(&tftp_remote_ip, tftp_filename, MAX_LEN)) {
 776                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 777                         net_ip.s_addr & 0xFF,
 778                         (net_ip.s_addr >>  8) & 0xFF,
 779                         (net_ip.s_addr >> 16) & 0xFF,
 780                         (net_ip.s_addr >> 24) & 0xFF);
 781
 782                 strncpy(tftp_filename, default_filename, DEFAULT_NAME_LEN);
 783                 tftp_filename[DEFAULT_NAME_LEN - 1] = 0;
 784
 785                 printf("*** Warning: no boot file name; using '%s'\n",
 786                        tftp_filename);
 787         }
 788
 789         printf("Using %s device\n", eth_get_name());
 790         printf("TFTP %s server %pI4; our IP address is %pI4",
 791 #ifdef CONFIG_CMD_TFTPPUT
 792                protocol == TFTPPUT ? "to" : "from",
 793 #else
 794                "from",
 795 #endif
 796                &tftp_remote_ip, &net_ip);
 797
 798         /* Check if we need to send across this subnet */
 799         if (net_gateway.s_addr && net_netmask.s_addr) {
 800                 struct in_addr our_net;
 801                 struct in_addr remote_net;
 802
 803                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 804                 remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
 805                 if (our_net.s_addr != remote_net.s_addr)
 806                         printf("; sending through gateway %pI4", &net_gateway);
 807         }
 808         putc('\n');
 809
 810         printf("Filename '%s'.", tftp_filename);
 811
 812         if (net_boot_file_expected_size_in_blocks) {
 813                 printf(" Size is 0x%x Bytes = ",
 814                        net_boot_file_expected_size_in_blocks << 9);
 815                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 816         }
 817
 818         putc('\n');
 819 #ifdef CONFIG_CMD_TFTPPUT
 820         tftp_put_active = (protocol == TFTPPUT);
 821         if (tftp_put_active) {
 822                 printf("Save address: 0x%lx\n", image_save_addr);
 823                 printf("Save size:    0x%lx\n", image_save_size);
 824                 net_boot_file_size = image_save_size;
 825                 puts("Saving: *\b");
 826                 tftp_state = STATE_SEND_WRQ;
 827                 new_transfer();
 828         } else
 829 #endif
 830         {
 831                 if (tftp_init_load_addr()) {
 832                         eth_halt();
 833                         net_set_state(NETLOOP_FAIL);
 834                         puts("\nTFTP error: ");
 835                         puts("trying to overwrite reserved memory...\n");
 836                         return;
 837                 }
 838                 printf("Load address: 0x%lx\n", tftp_load_addr);
 839                 puts("Loading: *\b");
 840                 tftp_state = STATE_SEND_RRQ;
 841 #ifdef CONFIG_CMD_BOOTEFI
 842                 efi_set_bootdev("Net", "", tftp_filename);
 843 #endif
 844         }
 845
 846         time_start = get_timer(0);
 847         timeout_count_max = tftp_timeout_count_max;
 848
 849         net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 850         net_set_udp_handler(tftp_handler);
 851 #ifdef CONFIG_CMD_TFTPPUT
 852         net_set_icmp_handler(icmp_handler);
 853 #endif
 854         tftp_remote_port = WELL_KNOWN_PORT;
 855         timeout_count = 0;
 856         /* Use a pseudo-random port unless a specific port is set */
 857         tftp_our_port = 1024 + (get_timer(0) % 3072);
 858
 859 #ifdef CONFIG_TFTP_PORT
 860         ep = env_get("tftpdstp");
 861         if (ep != NULL)
 862                 tftp_remote_port = simple_strtol(ep, NULL, 10);
 863         ep = env_get("tftpsrcp");
 864         if (ep != NULL)
 865                 tftp_our_port = simple_strtol(ep, NULL, 10);
 866 #endif
 867         tftp_cur_block = 0;
 868         tftp_windowsize = 1;
 869         tftp_last_nack = 0;
 870         /* zero out server ether in case the server ip has changed */
 871         memset(net_server_ethaddr, 0, 6);
 872         /* Revert tftp_block_size to dflt */
 873         tftp_block_size = TFTP_BLOCK_SIZE;
 874 #ifdef CONFIG_TFTP_TSIZE
 875         tftp_tsize = 0;
 876         tftp_tsize_num_hash = 0;
 877 #endif
 878
 879         tftp_send();
 880 }
 881
 882 #ifdef CONFIG_CMD_TFTPSRV
 883 void tftp_start_server(void)
 884 {
 885         tftp_filename[0] = 0;
 886
 887         if (tftp_init_load_addr()) {
 888                 eth_halt();
 889                 net_set_state(NETLOOP_FAIL);
 890                 puts("\nTFTP error: trying to overwrite reserved memory...\n");
 891                 return;
 892         }
 893         printf("Using %s device\n", eth_get_name());
 894         printf("Listening for TFTP transfer on %pI4\n", &net_ip);
 895         printf("Load address: 0x%lx\n", tftp_load_addr);
 896
 897         puts("Loading: *\b");
 898
 899         timeout_count_max = tftp_timeout_count_max;
 900         timeout_count = 0;
 901         timeout_ms = TIMEOUT;
 902         net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 903
 904         /* Revert tftp_block_size to dflt */
 905         tftp_block_size = TFTP_BLOCK_SIZE;
 906         tftp_cur_block = 0;
 907         tftp_our_port = WELL_KNOWN_PORT;
 908
 909 #ifdef CONFIG_TFTP_TSIZE
 910         tftp_tsize = 0;
 911         tftp_tsize_num_hash = 0;
 912 #endif
 913
 914         tftp_state = STATE_RECV_WRQ;
 915         net_set_udp_handler(tftp_handler);
 916
 917         /* zero out server ether in case the server ip has changed */
 918         memset(net_server_ethaddr, 0, 6);
 919 }
 920 #endif /* CONFIG_CMD_TFTPSRV */
 921