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 <efi_loader.h>
  12 #include <mapmem.h>
  13 #include <net.h>
  14 #include <net/tftp.h>
  15 #include "bootp.h"
  16 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
  17 #include <flash.h>
  18 #endif
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 /* Well known TFTP port # */
  23 #define WELL_KNOWN_PORT 69
  24 /* Millisecs to timeout for lost pkt */
  25 #define TIMEOUT         5000UL
  26 #ifndef CONFIG_NET_RETRY_COUNT
  27 /* # of timeouts before giving up */
  28 # define TIMEOUT_COUNT  10
  29 #else
  30 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  31 #endif
  32 /* Number of "loading" hashes per line (for checking the image size) */
  33 #define HASHES_PER_LINE 65
  34
  35 /*
  36  *      TFTP operations.
  37  */
  38 #define TFTP_RRQ        1
  39 #define TFTP_WRQ        2
  40 #define TFTP_DATA       3
  41 #define TFTP_ACK        4
  42 #define TFTP_ERROR      5
  43 #define TFTP_OACK       6
  44
  45 static ulong timeout_ms = TIMEOUT;
  46 static int timeout_count_max = TIMEOUT_COUNT;
  47 static ulong time_start;   /* Record time we started tftp */
  48
  49 /*
  50  * These globals govern the timeout behavior when attempting a connection to a
  51  * TFTP server. tftp_timeout_ms specifies the number of milliseconds to
  52  * wait for the server to respond to initial connection. Second global,
  53  * tftp_timeout_count_max, gives the number of such connection retries.
  54  * tftp_timeout_count_max must be non-negative and tftp_timeout_ms must be
  55  * positive. The globals are meant to be set (and restored) by code needing
  56  * non-standard timeout behavior when initiating a TFTP transfer.
  57  */
  58 ulong tftp_timeout_ms = TIMEOUT;
  59 int tftp_timeout_count_max = TIMEOUT_COUNT;
  60
  61 enum {
  62         TFTP_ERR_UNDEFINED           = 0,
  63         TFTP_ERR_FILE_NOT_FOUND      = 1,
  64         TFTP_ERR_ACCESS_DENIED       = 2,
  65         TFTP_ERR_DISK_FULL           = 3,
  66         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  67         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  68         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  69 };
  70
  71 static struct in_addr tftp_remote_ip;
  72 /* The UDP port at their end */
  73 static int      tftp_remote_port;
  74 /* The UDP port at our end */
  75 static int      tftp_our_port;
  76 static int      timeout_count;
  77 /* packet sequence number */
  78 static ulong    tftp_cur_block;
  79 /* last packet sequence number received */
  80 static ulong    tftp_prev_block;
  81 /* count of sequence number wraparounds */
  82 static ulong    tftp_block_wrap;
  83 /* memory offset due to wrapping */
  84 static ulong    tftp_block_wrap_offset;
  85 static int      tftp_state;
  86 static ulong    tftp_load_addr;
  87 #ifdef CONFIG_LMB
  88 static ulong    tftp_load_size;
  89 #endif
  90 #ifdef CONFIG_TFTP_TSIZE
  91 /* The file size reported by the server */
  92 static int      tftp_tsize;
  93 /* The number of hashes we printed */
  94 static short    tftp_tsize_num_hash;
  95 #endif
  96 #ifdef CONFIG_CMD_TFTPPUT
  97 /* 1 if writing, else 0 */
  98 static int      tftp_put_active;
  99 /* 1 if we have sent the last block */
 100 static int      tftp_put_final_block_sent;
 101 #else
 102 #define tftp_put_active 0
 103 #endif
 104
 105 #define STATE_SEND_RRQ  1
 106 #define STATE_DATA      2
 107 #define STATE_TOO_LARGE 3
 108 #define STATE_BAD_MAGIC 4
 109 #define STATE_OACK      5
 110 #define STATE_RECV_WRQ  6
 111 #define STATE_SEND_WRQ  7
 112
 113 /* default TFTP block size */
 114 #define TFTP_BLOCK_SIZE         512
 115 /* sequence number is 16 bit */
 116 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 117
 118 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 119 static char default_filename[DEFAULT_NAME_LEN];
 120
 121 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 122 #define MAX_LEN 128
 123 #else
 124 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 125 #endif
 126
 127 static char tftp_filename[MAX_LEN];
 128
 129 /* 512 is poor choice for ethernet, MTU is typically 1500.
 130  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 131  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 132  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 133  */
 134 #ifdef CONFIG_TFTP_BLOCKSIZE
 135 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 136 #else
 137 #define TFTP_MTU_BLOCKSIZE 1468
 138 #endif
 139
 140 static unsigned short tftp_block_size = TFTP_BLOCK_SIZE;
 141 static unsigned short tftp_block_size_option = TFTP_MTU_BLOCKSIZE;
 142
 143 #ifdef CONFIG_MCAST_TFTP
 144 #include <malloc.h>
 145 #define MTFTP_BITMAPSIZE        0x1000
 146 static unsigned *tftp_mcast_bitmap;
 147 static int tftp_mcast_prev_hole;
 148 static int tftp_mcast_bitmap_size = MTFTP_BITMAPSIZE;
 149 static int tftp_mcast_disabled;
 150 static int tftp_mcast_master_client;
 151 static int tftp_mcast_active;
 152 static int tftp_mcast_port;
 153 /* can get 'last' block before done..*/
 154 static ulong tftp_mcast_ending_block;
 155
 156 static void parse_multicast_oack(char *pkt, int len);
 157
 158 static void mcast_cleanup(void)
 159 {
 160         if (net_mcast_addr)
 161                 eth_mcast_join(net_mcast_addr, 0);
 162         if (tftp_mcast_bitmap)
 163                 free(tftp_mcast_bitmap);
 164         tftp_mcast_bitmap = NULL;
 165         net_mcast_addr.s_addr = 0;
 166         tftp_mcast_active = 0;
 167         tftp_mcast_port = 0;
 168         tftp_mcast_ending_block = -1;
 169 }
 170
 171 #endif  /* CONFIG_MCAST_TFTP */
 172
 173 static inline int store_block(int block, uchar *src, unsigned int len)
 174 {
 175         ulong offset = block * tftp_block_size + tftp_block_wrap_offset;
 176         ulong newsize = offset + len;
 177         ulong store_addr = tftp_load_addr + offset;
 178 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 179         int i, rc = 0;
 180
 181         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 182                 /* start address in flash? */
 183                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 184                         continue;
 185                 if (store_addr >= flash_info[i].start[0]) {
 186                         rc = 1;
 187                         break;
 188                 }
 189         }
 190
 191         if (rc) { /* Flash is destination for this packet */
 192                 rc = flash_write((char *)src, store_addr, len);
 193                 if (rc) {
 194                         flash_perror(rc);
 195                         return rc;
 196                 }
 197         } else
 198 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 199         {
 200                 void *ptr;
 201
 202 #ifdef CONFIG_LMB
 203                 if (store_addr < tftp_load_addr ||
 204                     store_addr + len > tftp_load_addr + tftp_load_size) {
 205                         puts("\nTFTP error: ");
 206                         puts("trying to overwrite reserved memory...\n");
 207                         return -1;
 208                 }
 209 #endif
 210                 ptr = map_sysmem(store_addr, len);
 211                 memcpy(ptr, src, len);
 212                 unmap_sysmem(ptr);
 213         }
 214 #ifdef CONFIG_MCAST_TFTP
 215         if (tftp_mcast_active)
 216                 ext2_set_bit(block, tftp_mcast_bitmap);
 217 #endif
 218
 219         if (net_boot_file_size < newsize)
 220                 net_boot_file_size = newsize;
 221
 222         return 0;
 223 }
 224
 225 /* Clear our state ready for a new transfer */
 226 static void new_transfer(void)
 227 {
 228         tftp_prev_block = 0;
 229         tftp_block_wrap = 0;
 230         tftp_block_wrap_offset = 0;
 231 #ifdef CONFIG_CMD_TFTPPUT
 232         tftp_put_final_block_sent = 0;
 233 #endif
 234 }
 235
 236 #ifdef CONFIG_CMD_TFTPPUT
 237 /**
 238  * Load the next block from memory to be sent over tftp.
 239  *
 240  * @param block Block number to send
 241  * @param dst   Destination buffer for data
 242  * @param len   Number of bytes in block (this one and every other)
 243  * @return number of bytes loaded
 244  */
 245 static int load_block(unsigned block, uchar *dst, unsigned len)
 246 {
 247         /* We may want to get the final block from the previous set */
 248         ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
 249         ulong tosend = len;
 250
 251         tosend = min(net_boot_file_size - offset, tosend);
 252         (void)memcpy(dst, (void *)(save_addr + offset), tosend);
 253         debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
 254               block, offset, len, tosend);
 255         return tosend;
 256 }
 257 #endif
 258
 259 static void tftp_send(void);
 260 static void tftp_timeout_handler(void);
 261
 262 /**********************************************************************/
 263
 264 static void show_block_marker(void)
 265 {
 266 #ifdef CONFIG_TFTP_TSIZE
 267         if (tftp_tsize) {
 268                 ulong pos = tftp_cur_block * tftp_block_size +
 269                         tftp_block_wrap_offset;
 270                 if (pos > tftp_tsize)
 271                         pos = tftp_tsize;
 272
 273                 while (tftp_tsize_num_hash < pos * 50 / tftp_tsize) {
 274                         putc('#');
 275                         tftp_tsize_num_hash++;
 276                 }
 277         } else
 278 #endif
 279         {
 280                 if (((tftp_cur_block - 1) % 10) == 0)
 281                         putc('#');
 282                 else if ((tftp_cur_block % (10 * HASHES_PER_LINE)) == 0)
 283                         puts("\n\t ");
 284         }
 285 }
 286
 287 /**
 288  * restart the current transfer due to an error
 289  *
 290  * @param msg   Message to print for user
 291  */
 292 static void restart(const char *msg)
 293 {
 294         printf("\n%s; starting again\n", msg);
 295 #ifdef CONFIG_MCAST_TFTP
 296         mcast_cleanup();
 297 #endif
 298         net_start_again();
 299 }
 300
 301 /*
 302  * Check if the block number has wrapped, and update progress
 303  *
 304  * TODO: The egregious use of global variables in this file should be tidied.
 305  */
 306 static void update_block_number(void)
 307 {
 308         /*
 309          * RFC1350 specifies that the first data packet will
 310          * have sequence number 1. If we receive a sequence
 311          * number of 0 this means that there was a wrap
 312          * around of the (16 bit) counter.
 313          */
 314         if (tftp_cur_block == 0 && tftp_prev_block != 0) {
 315                 tftp_block_wrap++;
 316                 tftp_block_wrap_offset += tftp_block_size * TFTP_SEQUENCE_SIZE;
 317                 timeout_count = 0; /* we've done well, reset the timeout */
 318         } else {
 319                 show_block_marker();
 320         }
 321 }
 322
 323 /* The TFTP get or put is complete */
 324 static void tftp_complete(void)
 325 {
 326 #ifdef CONFIG_TFTP_TSIZE
 327         /* Print hash marks for the last packet received */
 328         while (tftp_tsize && tftp_tsize_num_hash < 49) {
 329                 putc('#');
 330                 tftp_tsize_num_hash++;
 331         }
 332         puts("  ");
 333         print_size(tftp_tsize, "");
 334 #endif
 335         time_start = get_timer(time_start);
 336         if (time_start > 0) {
 337                 puts("\n\t ");  /* Line up with "Loading: " */
 338                 print_size(net_boot_file_size /
 339                         time_start * 1000, "/s");
 340         }
 341         puts("\ndone\n");
 342         net_set_state(NETLOOP_SUCCESS);
 343 }
 344
 345 static void tftp_send(void)
 346 {
 347         uchar *pkt;
 348         uchar *xp;
 349         int len = 0;
 350         ushort *s;
 351
 352 #ifdef CONFIG_MCAST_TFTP
 353         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 354         if (tftp_mcast_active && tftp_state == STATE_DATA &&
 355             tftp_mcast_master_client == 0)
 356                 return;
 357 #endif
 358         /*
 359          *      We will always be sending some sort of packet, so
 360          *      cobble together the packet headers now.
 361          */
 362         pkt = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
 363
 364         switch (tftp_state) {
 365         case STATE_SEND_RRQ:
 366         case STATE_SEND_WRQ:
 367                 xp = pkt;
 368                 s = (ushort *)pkt;
 369 #ifdef CONFIG_CMD_TFTPPUT
 370                 *s++ = htons(tftp_state == STATE_SEND_RRQ ? TFTP_RRQ :
 371                         TFTP_WRQ);
 372 #else
 373                 *s++ = htons(TFTP_RRQ);
 374 #endif
 375                 pkt = (uchar *)s;
 376                 strcpy((char *)pkt, tftp_filename);
 377                 pkt += strlen(tftp_filename) + 1;
 378                 strcpy((char *)pkt, "octet");
 379                 pkt += 5 /*strlen("octet")*/ + 1;
 380                 strcpy((char *)pkt, "timeout");
 381                 pkt += 7 /*strlen("timeout")*/ + 1;
 382                 sprintf((char *)pkt, "%lu", timeout_ms / 1000);
 383                 debug("send option \"timeout %s\"\n", (char *)pkt);
 384                 pkt += strlen((char *)pkt) + 1;
 385 #ifdef CONFIG_TFTP_TSIZE
 386                 pkt += sprintf((char *)pkt, "tsize%c%u%c",
 387                                 0, net_boot_file_size, 0);
 388 #endif
 389                 /* try for more effic. blk size */
 390                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 391                                 0, tftp_block_size_option, 0);
 392 #ifdef CONFIG_MCAST_TFTP
 393                 /* Check all preconditions before even trying the option */
 394                 if (!tftp_mcast_disabled) {
 395                         tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
 396                         if (tftp_mcast_bitmap && eth_get_dev()->mcast) {
 397                                 free(tftp_mcast_bitmap);
 398                                 tftp_mcast_bitmap = NULL;
 399                                 pkt += sprintf((char *)pkt, "multicast%c%c",
 400                                         0, 0);
 401                         }
 402                 }
 403 #endif /* CONFIG_MCAST_TFTP */
 404                 len = pkt - xp;
 405                 break;
 406
 407         case STATE_OACK:
 408 #ifdef CONFIG_MCAST_TFTP
 409                 /* My turn!  Start at where I need blocks I missed. */
 410                 if (tftp_mcast_active)
 411                         tftp_cur_block = ext2_find_next_zero_bit(
 412                                 tftp_mcast_bitmap,
 413                                 tftp_mcast_bitmap_size * 8, 0);
 414                 /* fall through */
 415 #endif
 416
 417         case STATE_RECV_WRQ:
 418         case STATE_DATA:
 419                 xp = pkt;
 420                 s = (ushort *)pkt;
 421                 s[0] = htons(TFTP_ACK);
 422                 s[1] = htons(tftp_cur_block);
 423                 pkt = (uchar *)(s + 2);
 424 #ifdef CONFIG_CMD_TFTPPUT
 425                 if (tftp_put_active) {
 426                         int toload = tftp_block_size;
 427                         int loaded = load_block(tftp_cur_block, pkt, toload);
 428
 429                         s[0] = htons(TFTP_DATA);
 430                         pkt += loaded;
 431                         tftp_put_final_block_sent = (loaded < toload);
 432                 }
 433 #endif
 434                 len = pkt - xp;
 435                 break;
 436
 437         case STATE_TOO_LARGE:
 438                 xp = pkt;
 439                 s = (ushort *)pkt;
 440                 *s++ = htons(TFTP_ERROR);
 441                         *s++ = htons(3);
 442
 443                 pkt = (uchar *)s;
 444                 strcpy((char *)pkt, "File too large");
 445                 pkt += 14 /*strlen("File too large")*/ + 1;
 446                 len = pkt - xp;
 447                 break;
 448
 449         case STATE_BAD_MAGIC:
 450                 xp = pkt;
 451                 s = (ushort *)pkt;
 452                 *s++ = htons(TFTP_ERROR);
 453                 *s++ = htons(2);
 454                 pkt = (uchar *)s;
 455                 strcpy((char *)pkt, "File has bad magic");
 456                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 457                 len = pkt - xp;
 458                 break;
 459         }
 460
 461         net_send_udp_packet(net_server_ethaddr, tftp_remote_ip,
 462                             tftp_remote_port, tftp_our_port, len);
 463 }
 464
 465 #ifdef CONFIG_CMD_TFTPPUT
 466 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 467                          struct in_addr sip, unsigned src, uchar *pkt,
 468                          unsigned len)
 469 {
 470         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 471                 /* Oh dear the other end has gone away */
 472                 restart("TFTP server died");
 473         }
 474 }
 475 #endif
 476
 477 static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 478                          unsigned src, unsigned len)
 479 {
 480         __be16 proto;
 481         __be16 *s;
 482         int i;
 483
 484         if (dest != tftp_our_port) {
 485 #ifdef CONFIG_MCAST_TFTP
 486                 if (tftp_mcast_active &&
 487                     (!tftp_mcast_port || dest != tftp_mcast_port))
 488 #endif
 489                         return;
 490         }
 491         if (tftp_state != STATE_SEND_RRQ && src != tftp_remote_port &&
 492             tftp_state != STATE_RECV_WRQ && tftp_state != STATE_SEND_WRQ)
 493                 return;
 494
 495         if (len < 2)
 496                 return;
 497         len -= 2;
 498         /* warning: don't use increment (++) in ntohs() macros!! */
 499         s = (__be16 *)pkt;
 500         proto = *s++;
 501         pkt = (uchar *)s;
 502         switch (ntohs(proto)) {
 503         case TFTP_RRQ:
 504                 break;
 505
 506         case TFTP_ACK:
 507 #ifdef CONFIG_CMD_TFTPPUT
 508                 if (tftp_put_active) {
 509                         if (tftp_put_final_block_sent) {
 510                                 tftp_complete();
 511                         } else {
 512                                 /*
 513                                  * Move to the next block. We want our block
 514                                  * count to wrap just like the other end!
 515                                  */
 516                                 int block = ntohs(*s);
 517                                 int ack_ok = (tftp_cur_block == block);
 518
 519                                 tftp_cur_block = (unsigned short)(block + 1);
 520                                 update_block_number();
 521                                 if (ack_ok)
 522                                         tftp_send(); /* Send next data block */
 523                         }
 524                 }
 525 #endif
 526                 break;
 527
 528         default:
 529                 break;
 530
 531 #ifdef CONFIG_CMD_TFTPSRV
 532         case TFTP_WRQ:
 533                 debug("Got WRQ\n");
 534                 tftp_remote_ip = sip;
 535                 tftp_remote_port = src;
 536                 tftp_our_port = 1024 + (get_timer(0) % 3072);
 537                 new_transfer();
 538                 tftp_send(); /* Send ACK(0) */
 539                 break;
 540 #endif
 541
 542         case TFTP_OACK:
 543                 debug("Got OACK: %s %s\n",
 544                       pkt, pkt + strlen((char *)pkt) + 1);
 545                 tftp_state = STATE_OACK;
 546                 tftp_remote_port = src;
 547                 /*
 548                  * Check for 'blksize' option.
 549                  * Careful: "i" is signed, "len" is unsigned, thus
 550                  * something like "len-8" may give a *huge* number
 551                  */
 552                 for (i = 0; i+8 < len; i++) {
 553                         if (strcmp((char *)pkt + i, "blksize") == 0) {
 554                                 tftp_block_size = (unsigned short)
 555                                         simple_strtoul((char *)pkt + i + 8,
 556                                                        NULL, 10);
 557                                 debug("Blocksize ack: %s, %d\n",
 558                                       (char *)pkt + i + 8, tftp_block_size);
 559                         }
 560 #ifdef CONFIG_TFTP_TSIZE
 561                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 562                                 tftp_tsize = simple_strtoul((char *)pkt + i + 6,
 563                                                            NULL, 10);
 564                                 debug("size = %s, %d\n",
 565                                       (char *)pkt + i + 6, tftp_tsize);
 566                         }
 567 #endif
 568                 }
 569 #ifdef CONFIG_MCAST_TFTP
 570                 parse_multicast_oack((char *)pkt, len - 1);
 571                 if ((tftp_mcast_active) && (!tftp_mcast_master_client))
 572                         tftp_state = STATE_DATA;        /* passive.. */
 573                 else
 574 #endif
 575 #ifdef CONFIG_CMD_TFTPPUT
 576                 if (tftp_put_active) {
 577                         /* Get ready to send the first block */
 578                         tftp_state = STATE_DATA;
 579                         tftp_cur_block++;
 580                 }
 581 #endif
 582                 tftp_send(); /* Send ACK or first data block */
 583                 break;
 584         case TFTP_DATA:
 585                 if (len < 2)
 586                         return;
 587                 len -= 2;
 588                 tftp_cur_block = ntohs(*(__be16 *)pkt);
 589
 590                 update_block_number();
 591
 592                 if (tftp_state == STATE_SEND_RRQ)
 593                         debug("Server did not acknowledge timeout option!\n");
 594
 595                 if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK ||
 596                     tftp_state == STATE_RECV_WRQ) {
 597                         /* first block received */
 598                         tftp_state = STATE_DATA;
 599                         tftp_remote_port = src;
 600                         new_transfer();
 601
 602 #ifdef CONFIG_MCAST_TFTP
 603                         if (tftp_mcast_active) { /* start!=1 common if mcast */
 604                                 tftp_prev_block = tftp_cur_block - 1;
 605                         } else
 606 #endif
 607                         if (tftp_cur_block != 1) {      /* Assertion */
 608                                 puts("\nTFTP error: ");
 609                                 printf("First block is not block 1 (%ld)\n",
 610                                        tftp_cur_block);
 611                                 puts("Starting again\n\n");
 612                                 net_start_again();
 613                                 break;
 614                         }
 615                 }
 616
 617                 if (tftp_cur_block == tftp_prev_block) {
 618                         /* Same block again; ignore it. */
 619                         break;
 620                 }
 621
 622                 tftp_prev_block = tftp_cur_block;
 623                 timeout_count_max = tftp_timeout_count_max;
 624                 net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 625
 626                 if (store_block(tftp_cur_block - 1, pkt + 2, len)) {
 627                         eth_halt();
 628                         net_set_state(NETLOOP_FAIL);
 629                         break;
 630                 }
 631
 632                 /*
 633                  *      Acknowledge the block just received, which will prompt
 634                  *      the remote for the next one.
 635                  */
 636 #ifdef CONFIG_MCAST_TFTP
 637                 /* if I am the MasterClient, actively calculate what my next
 638                  * needed block is; else I'm passive; not ACKING
 639                  */
 640                 if (tftp_mcast_active) {
 641                         if (len < tftp_block_size)  {
 642                                 tftp_mcast_ending_block = tftp_cur_block;
 643                         } else if (tftp_mcast_master_client) {
 644                                 tftp_mcast_prev_hole = ext2_find_next_zero_bit(
 645                                         tftp_mcast_bitmap,
 646                                         tftp_mcast_bitmap_size * 8,
 647                                         tftp_mcast_prev_hole);
 648                                 tftp_cur_block = tftp_mcast_prev_hole;
 649                                 if (tftp_cur_block >
 650                                     ((tftp_mcast_bitmap_size * 8) - 1)) {
 651                                         debug("tftpfile too big\n");
 652                                         /* try to double it and retry */
 653                                         tftp_mcast_bitmap_size <<= 1;
 654                                         mcast_cleanup();
 655                                         net_start_again();
 656                                         return;
 657                                 }
 658                                 tftp_prev_block = tftp_cur_block;
 659                         }
 660                 }
 661 #endif
 662                 tftp_send();
 663
 664 #ifdef CONFIG_MCAST_TFTP
 665                 if (tftp_mcast_active) {
 666                         if (tftp_mcast_master_client &&
 667                             (tftp_cur_block >= tftp_mcast_ending_block)) {
 668                                 puts("\nMulticast tftp done\n");
 669                                 mcast_cleanup();
 670                                 net_set_state(NETLOOP_SUCCESS);
 671                         }
 672                 } else
 673 #endif
 674                 if (len < tftp_block_size)
 675                         tftp_complete();
 676                 break;
 677
 678         case TFTP_ERROR:
 679                 printf("\nTFTP error: '%s' (%d)\n",
 680                        pkt + 2, ntohs(*(__be16 *)pkt));
 681
 682                 switch (ntohs(*(__be16 *)pkt)) {
 683                 case TFTP_ERR_FILE_NOT_FOUND:
 684                 case TFTP_ERR_ACCESS_DENIED:
 685                         puts("Not retrying...\n");
 686                         eth_halt();
 687                         net_set_state(NETLOOP_FAIL);
 688                         break;
 689                 case TFTP_ERR_UNDEFINED:
 690                 case TFTP_ERR_DISK_FULL:
 691                 case TFTP_ERR_UNEXPECTED_OPCODE:
 692                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 693                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 694                 default:
 695                         puts("Starting again\n\n");
 696 #ifdef CONFIG_MCAST_TFTP
 697                         mcast_cleanup();
 698 #endif
 699                         net_start_again();
 700                         break;
 701                 }
 702                 break;
 703         }
 704 }
 705
 706
 707 static void tftp_timeout_handler(void)
 708 {
 709         if (++timeout_count > timeout_count_max) {
 710                 restart("Retry count exceeded");
 711         } else {
 712                 puts("T ");
 713                 net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 714                 if (tftp_state != STATE_RECV_WRQ)
 715                         tftp_send();
 716         }
 717 }
 718
 719 /* Initialize tftp_load_addr and tftp_load_size from load_addr and lmb */
 720 static int tftp_init_load_addr(void)
 721 {
 722 #ifdef CONFIG_LMB
 723         struct lmb lmb;
 724         phys_size_t max_size;
 725
 726         lmb_init_and_reserve(&lmb, gd->bd->bi_dram[0].start,
 727                              gd->bd->bi_dram[0].size, (void *)gd->fdt_blob);
 728
 729         max_size = lmb_get_unreserved_size(&lmb, load_addr);
 730         if (!max_size)
 731                 return -1;
 732
 733         tftp_load_size = max_size;
 734 #endif
 735         tftp_load_addr = load_addr;
 736         return 0;
 737 }
 738
 739 void tftp_start(enum proto_t protocol)
 740 {
 741 #if CONFIG_NET_TFTP_VARS
 742         char *ep;             /* Environment pointer */
 743
 744         /*
 745          * Allow the user to choose TFTP blocksize and timeout.
 746          * TFTP protocol has a minimal timeout of 1 second.
 747          */
 748
 749         ep = env_get("tftpblocksize");
 750         if (ep != NULL)
 751                 tftp_block_size_option = simple_strtol(ep, NULL, 10);
 752
 753         ep = env_get("tftptimeout");
 754         if (ep != NULL)
 755                 timeout_ms = simple_strtol(ep, NULL, 10);
 756
 757         if (timeout_ms < 1000) {
 758                 printf("TFTP timeout (%ld ms) too low, set min = 1000 ms\n",
 759                        timeout_ms);
 760                 timeout_ms = 1000;
 761         }
 762
 763         ep = env_get("tftptimeoutcountmax");
 764         if (ep != NULL)
 765                 tftp_timeout_count_max = simple_strtol(ep, NULL, 10);
 766
 767         if (tftp_timeout_count_max < 0) {
 768                 printf("TFTP timeout count max (%d ms) negative, set to 0\n",
 769                        tftp_timeout_count_max);
 770                 tftp_timeout_count_max = 0;
 771         }
 772 #endif
 773
 774         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 775               tftp_block_size_option, timeout_ms);
 776
 777         tftp_remote_ip = net_server_ip;
 778         if (!net_parse_bootfile(&tftp_remote_ip, tftp_filename, MAX_LEN)) {
 779                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 780                         net_ip.s_addr & 0xFF,
 781                         (net_ip.s_addr >>  8) & 0xFF,
 782                         (net_ip.s_addr >> 16) & 0xFF,
 783                         (net_ip.s_addr >> 24) & 0xFF);
 784
 785                 strncpy(tftp_filename, default_filename, DEFAULT_NAME_LEN);
 786                 tftp_filename[DEFAULT_NAME_LEN - 1] = 0;
 787
 788                 printf("*** Warning: no boot file name; using '%s'\n",
 789                        tftp_filename);
 790         }
 791
 792         printf("Using %s device\n", eth_get_name());
 793         printf("TFTP %s server %pI4; our IP address is %pI4",
 794 #ifdef CONFIG_CMD_TFTPPUT
 795                protocol == TFTPPUT ? "to" : "from",
 796 #else
 797                "from",
 798 #endif
 799                &tftp_remote_ip, &net_ip);
 800
 801         /* Check if we need to send across this subnet */
 802         if (net_gateway.s_addr && net_netmask.s_addr) {
 803                 struct in_addr our_net;
 804                 struct in_addr remote_net;
 805
 806                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 807                 remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
 808                 if (our_net.s_addr != remote_net.s_addr)
 809                         printf("; sending through gateway %pI4", &net_gateway);
 810         }
 811         putc('\n');
 812
 813         printf("Filename '%s'.", tftp_filename);
 814
 815         if (net_boot_file_expected_size_in_blocks) {
 816                 printf(" Size is 0x%x Bytes = ",
 817                        net_boot_file_expected_size_in_blocks << 9);
 818                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 819         }
 820
 821         putc('\n');
 822 #ifdef CONFIG_CMD_TFTPPUT
 823         tftp_put_active = (protocol == TFTPPUT);
 824         if (tftp_put_active) {
 825                 printf("Save address: 0x%lx\n", save_addr);
 826                 printf("Save size:    0x%lx\n", save_size);
 827                 net_boot_file_size = save_size;
 828                 puts("Saving: *\b");
 829                 tftp_state = STATE_SEND_WRQ;
 830                 new_transfer();
 831         } else
 832 #endif
 833         {
 834                 if (tftp_init_load_addr()) {
 835                         eth_halt();
 836                         net_set_state(NETLOOP_FAIL);
 837                         puts("\nTFTP error: ");
 838                         puts("trying to overwrite reserved memory...\n");
 839                         return;
 840                 }
 841                 printf("Load address: 0x%lx\n", tftp_load_addr);
 842                 puts("Loading: *\b");
 843                 tftp_state = STATE_SEND_RRQ;
 844 #ifdef CONFIG_CMD_BOOTEFI
 845                 efi_set_bootdev("Net", "", tftp_filename);
 846 #endif
 847         }
 848
 849         time_start = get_timer(0);
 850         timeout_count_max = tftp_timeout_count_max;
 851
 852         net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 853         net_set_udp_handler(tftp_handler);
 854 #ifdef CONFIG_CMD_TFTPPUT
 855         net_set_icmp_handler(icmp_handler);
 856 #endif
 857         tftp_remote_port = WELL_KNOWN_PORT;
 858         timeout_count = 0;
 859         /* Use a pseudo-random port unless a specific port is set */
 860         tftp_our_port = 1024 + (get_timer(0) % 3072);
 861
 862 #ifdef CONFIG_TFTP_PORT
 863         ep = env_get("tftpdstp");
 864         if (ep != NULL)
 865                 tftp_remote_port = simple_strtol(ep, NULL, 10);
 866         ep = env_get("tftpsrcp");
 867         if (ep != NULL)
 868                 tftp_our_port = simple_strtol(ep, NULL, 10);
 869 #endif
 870         tftp_cur_block = 0;
 871
 872         /* zero out server ether in case the server ip has changed */
 873         memset(net_server_ethaddr, 0, 6);
 874         /* Revert tftp_block_size to dflt */
 875         tftp_block_size = TFTP_BLOCK_SIZE;
 876 #ifdef CONFIG_MCAST_TFTP
 877         mcast_cleanup();
 878 #endif
 879 #ifdef CONFIG_TFTP_TSIZE
 880         tftp_tsize = 0;
 881         tftp_tsize_num_hash = 0;
 882 #endif
 883
 884         tftp_send();
 885 }
 886
 887 #ifdef CONFIG_CMD_TFTPSRV
 888 void tftp_start_server(void)
 889 {
 890         tftp_filename[0] = 0;
 891
 892         if (tftp_init_load_addr()) {
 893                 eth_halt();
 894                 net_set_state(NETLOOP_FAIL);
 895                 puts("\nTFTP error: trying to overwrite reserved memory...\n");
 896                 return;
 897         }
 898         printf("Using %s device\n", eth_get_name());
 899         printf("Listening for TFTP transfer on %pI4\n", &net_ip);
 900         printf("Load address: 0x%lx\n", tftp_load_addr);
 901
 902         puts("Loading: *\b");
 903
 904         timeout_count_max = tftp_timeout_count_max;
 905         timeout_count = 0;
 906         timeout_ms = TIMEOUT;
 907         net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 908
 909         /* Revert tftp_block_size to dflt */
 910         tftp_block_size = TFTP_BLOCK_SIZE;
 911         tftp_cur_block = 0;
 912         tftp_our_port = WELL_KNOWN_PORT;
 913
 914 #ifdef CONFIG_TFTP_TSIZE
 915         tftp_tsize = 0;
 916         tftp_tsize_num_hash = 0;
 917 #endif
 918
 919         tftp_state = STATE_RECV_WRQ;
 920         net_set_udp_handler(tftp_handler);
 921
 922         /* zero out server ether in case the server ip has changed */
 923         memset(net_server_ethaddr, 0, 6);
 924 }
 925 #endif /* CONFIG_CMD_TFTPSRV */
 926
 927 #ifdef CONFIG_MCAST_TFTP
 928 /*
 929  * Credits: atftp project.
 930  */
 931
 932 /*
 933  * Pick up BcastAddr, Port, and whether I am [now] the master-client.
 934  * Frame:
 935  *    +-------+-----------+---+-------~~-------+---+
 936  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 937  *    +-------+-----------+---+-------~~-------+---+
 938  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 939  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 940  * master-client, I'm a passive client, gathering what DataBlocks I may and
 941  * making note of which ones I got in my bitmask.
 942  * In theory, I never go from master->passive..
 943  * .. this comes in with pkt already pointing just past opc
 944  */
 945 static void parse_multicast_oack(char *pkt, int len)
 946 {
 947         int i;
 948         struct in_addr addr;
 949         char *mc_adr;
 950         char *port;
 951         char *mc;
 952
 953         mc_adr = NULL;
 954         port = NULL;
 955         mc = NULL;
 956         /* march along looking for 'multicast\0', which has to start at least
 957          * 14 bytes back from the end.
 958          */
 959         for (i = 0; i < len - 14; i++)
 960                 if (strcmp(pkt + i, "multicast") == 0)
 961                         break;
 962         if (i >= (len - 14)) /* non-Multicast OACK, ign. */
 963                 return;
 964
 965         i += 10; /* strlen multicast */
 966         mc_adr = pkt + i;
 967         for (; i < len; i++) {
 968                 if (*(pkt + i) == ',') {
 969                         *(pkt + i) = '\0';
 970                         if (port) {
 971                                 mc = pkt + i + 1;
 972                                 break;
 973                         } else {
 974                                 port = pkt + i + 1;
 975                         }
 976                 }
 977         }
 978         if (!port || !mc_adr || !mc)
 979                 return;
 980         if (tftp_mcast_active && tftp_mcast_master_client) {
 981                 printf("I got a OACK as master Client, WRONG!\n");
 982                 return;
 983         }
 984         /* ..I now accept packets destined for this MCAST addr, port */
 985         if (!tftp_mcast_active) {
 986                 if (tftp_mcast_bitmap) {
 987                         printf("Internal failure! no mcast.\n");
 988                         free(tftp_mcast_bitmap);
 989                         tftp_mcast_bitmap = NULL;
 990                         tftp_mcast_disabled = 1;
 991                         return;
 992                 }
 993                 /* I malloc instead of pre-declare; so that if the file ends
 994                  * up being too big for this bitmap I can retry
 995                  */
 996                 tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
 997                 if (!tftp_mcast_bitmap) {
 998                         printf("No bitmap, no multicast. Sorry.\n");
 999                         tftp_mcast_disabled = 1;
1000                         return;
1001                 }
1002                 memset(tftp_mcast_bitmap, 0, tftp_mcast_bitmap_size);
1003                 tftp_mcast_prev_hole = 0;
1004                 tftp_mcast_active = 1;
1005         }
1006         addr = string_to_ip(mc_adr);
1007         if (net_mcast_addr.s_addr != addr.s_addr) {
1008                 if (net_mcast_addr.s_addr)
1009                         eth_mcast_join(net_mcast_addr, 0);
1010                 net_mcast_addr = addr;
1011                 if (eth_mcast_join(net_mcast_addr, 1)) {
1012                         printf("Fail to set mcast, revert to TFTP\n");
1013                         tftp_mcast_disabled = 1;
1014                         mcast_cleanup();
1015                         net_start_again();
1016                 }
1017         }
1018         tftp_mcast_master_client = simple_strtoul((char *)mc, NULL, 10);
1019         tftp_mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
1020         printf("Multicast: %s:%d [%d]\n", mc_adr, tftp_mcast_port,
1021                tftp_mcast_master_client);
1022         return;
1023 }
1024
1025 #endif /* Multicast TFTP */