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