net/tftp.c

   1 /*
   2  * Copyright 1994, 1995, 2000 Neil Russell.
   3  * (See License)
   4  * Copyright 2000, 2001 DENX Software Engineering, Wolfgang Denk, wd@denx.de
   5  * Copyright 2011 Comelit Group SpA,
   6  *                Luca Ceresoli <luca.ceresoli@comelit.it>
   7  */
   8
   9 #include <common.h>
  10 #include <command.h>
  11 #include <mapmem.h>
  12 #include <net.h>
  13 #include "tftp.h"
  14 #include "bootp.h"
  15 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
  16 #include <flash.h>
  17 #endif
  18
  19 /* Well known TFTP port # */
  20 #define WELL_KNOWN_PORT 69
  21 /* Millisecs to timeout for lost pkt */
  22 #define TIMEOUT         100UL
  23 #ifndef CONFIG_NET_RETRY_COUNT
  24 /* # of timeouts before giving up */
  25 # define TIMEOUT_COUNT  1000
  26 #else
  27 # define TIMEOUT_COUNT  (CONFIG_NET_RETRY_COUNT * 2)
  28 #endif
  29 /* Number of "loading" hashes per line (for checking the image size) */
  30 #define HASHES_PER_LINE 65
  31
  32 /*
  33  *      TFTP operations.
  34  */
  35 #define TFTP_RRQ        1
  36 #define TFTP_WRQ        2
  37 #define TFTP_DATA       3
  38 #define TFTP_ACK        4
  39 #define TFTP_ERROR      5
  40 #define TFTP_OACK       6
  41
  42 static ulong timeout_ms = TIMEOUT;
  43 static int timeout_count_max = TIMEOUT_COUNT;
  44 static ulong time_start;   /* Record time we started tftp */
  45
  46 /*
  47  * These globals govern the timeout behavior when attempting a connection to a
  48  * TFTP server. tftp_timeout_ms specifies the number of milliseconds to
  49  * wait for the server to respond to initial connection. Second global,
  50  * tftp_timeout_count_max, gives the number of such connection retries.
  51  * tftp_timeout_count_max must be non-negative and tftp_timeout_ms must be
  52  * positive. The globals are meant to be set (and restored) by code needing
  53  * non-standard timeout behavior when initiating a TFTP transfer.
  54  */
  55 ulong tftp_timeout_ms = TIMEOUT;
  56 int tftp_timeout_count_max = TIMEOUT_COUNT;
  57
  58 enum {
  59         TFTP_ERR_UNDEFINED           = 0,
  60         TFTP_ERR_FILE_NOT_FOUND      = 1,
  61         TFTP_ERR_ACCESS_DENIED       = 2,
  62         TFTP_ERR_DISK_FULL           = 3,
  63         TFTP_ERR_UNEXPECTED_OPCODE   = 4,
  64         TFTP_ERR_UNKNOWN_TRANSFER_ID  = 5,
  65         TFTP_ERR_FILE_ALREADY_EXISTS = 6,
  66 };
  67
  68 static struct in_addr tftp_remote_ip;
  69 /* The UDP port at their end */
  70 static int      tftp_remote_port;
  71 /* The UDP port at our end */
  72 static int      tftp_our_port;
  73 static int      timeout_count;
  74 /* packet sequence number */
  75 static ulong    tftp_cur_block;
  76 /* last packet sequence number received */
  77 static ulong    tftp_prev_block;
  78 /* count of sequence number wraparounds */
  79 static ulong    tftp_block_wrap;
  80 /* memory offset due to wrapping */
  81 static ulong    tftp_block_wrap_offset;
  82 static int      tftp_state;
  83 #ifdef CONFIG_TFTP_TSIZE
  84 /* The file size reported by the server */
  85 static int      tftp_tsize;
  86 /* The number of hashes we printed */
  87 static short    tftp_tsize_num_hash;
  88 #endif
  89 #ifdef CONFIG_CMD_TFTPPUT
  90 /* 1 if writing, else 0 */
  91 static int      tftp_put_active;
  92 /* 1 if we have sent the last block */
  93 static int      tftp_put_final_block_sent;
  94 #else
  95 #define tftp_put_active 0
  96 #endif
  97
  98 #define STATE_SEND_RRQ  1
  99 #define STATE_DATA      2
 100 #define STATE_TOO_LARGE 3
 101 #define STATE_BAD_MAGIC 4
 102 #define STATE_OACK      5
 103 #define STATE_RECV_WRQ  6
 104 #define STATE_SEND_WRQ  7
 105
 106 /* default TFTP block size */
 107 #define TFTP_BLOCK_SIZE         512
 108 /* sequence number is 16 bit */
 109 #define TFTP_SEQUENCE_SIZE      ((ulong)(1<<16))
 110
 111 #define DEFAULT_NAME_LEN        (8 + 4 + 1)
 112 static char default_filename[DEFAULT_NAME_LEN];
 113
 114 #ifndef CONFIG_TFTP_FILE_NAME_MAX_LEN
 115 #define MAX_LEN 128
 116 #else
 117 #define MAX_LEN CONFIG_TFTP_FILE_NAME_MAX_LEN
 118 #endif
 119
 120 static char tftp_filename[MAX_LEN];
 121
 122 /* 512 is poor choice for ethernet, MTU is typically 1500.
 123  * Minus eth.hdrs thats 1468.  Can get 2x better throughput with
 124  * almost-MTU block sizes.  At least try... fall back to 512 if need be.
 125  * (but those using CONFIG_IP_DEFRAG may want to set a larger block in cfg file)
 126  */
 127 #ifdef CONFIG_TFTP_BLOCKSIZE
 128 #define TFTP_MTU_BLOCKSIZE CONFIG_TFTP_BLOCKSIZE
 129 #else
 130 #define TFTP_MTU_BLOCKSIZE 1468
 131 #endif
 132
 133 static unsigned short tftp_block_size = TFTP_BLOCK_SIZE;
 134 static unsigned short tftp_block_size_option = TFTP_MTU_BLOCKSIZE;
 135
 136 #ifdef CONFIG_MCAST_TFTP
 137 #include <malloc.h>
 138 #define MTFTP_BITMAPSIZE        0x1000
 139 static unsigned *tftp_mcast_bitmap;
 140 static int tftp_mcast_prev_hole;
 141 static int tftp_mcast_bitmap_size = MTFTP_BITMAPSIZE;
 142 static int tftp_mcast_disabled;
 143 static int tftp_mcast_master_client;
 144 static int tftp_mcast_active;
 145 static int tftp_mcast_port;
 146 /* can get 'last' block before done..*/
 147 static ulong tftp_mcast_ending_block;
 148
 149 static void parse_multicast_oack(char *pkt, int len);
 150
 151 static void mcast_cleanup(void)
 152 {
 153         if (net_mcast_addr)
 154                 eth_mcast_join(net_mcast_addr, 0);
 155         if (tftp_mcast_bitmap)
 156                 free(tftp_mcast_bitmap);
 157         tftp_mcast_bitmap = NULL;
 158         net_mcast_addr.s_addr = 0;
 159         tftp_mcast_active = 0;
 160         tftp_mcast_port = 0;
 161         tftp_mcast_ending_block = -1;
 162 }
 163
 164 #endif  /* CONFIG_MCAST_TFTP */
 165
 166 static inline void store_block(int block, uchar *src, unsigned len)
 167 {
 168         ulong offset = block * tftp_block_size + tftp_block_wrap_offset;
 169         ulong newsize = offset + len;
 170 #ifdef CONFIG_SYS_DIRECT_FLASH_TFTP
 171         int i, rc = 0;
 172
 173         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
 174                 /* start address in flash? */
 175                 if (flash_info[i].flash_id == FLASH_UNKNOWN)
 176                         continue;
 177                 if (load_addr + offset >= flash_info[i].start[0]) {
 178                         rc = 1;
 179                         break;
 180                 }
 181         }
 182
 183         if (rc) { /* Flash is destination for this packet */
 184                 rc = flash_write((char *)src, (ulong)(load_addr+offset), len);
 185                 if (rc) {
 186                         flash_perror(rc);
 187                         net_set_state(NETLOOP_FAIL);
 188                         return;
 189                 }
 190         } else
 191 #endif /* CONFIG_SYS_DIRECT_FLASH_TFTP */
 192         {
 193                 void *ptr = map_sysmem(load_addr + offset, len);
 194
 195                 memcpy(ptr, src, len);
 196                 unmap_sysmem(ptr);
 197         }
 198 #ifdef CONFIG_MCAST_TFTP
 199         if (tftp_mcast_active)
 200                 ext2_set_bit(block, tftp_mcast_bitmap);
 201 #endif
 202
 203         if (net_boot_file_size < newsize)
 204                 net_boot_file_size = newsize;
 205 }
 206
 207 /* Clear our state ready for a new transfer */
 208 static void new_transfer(void)
 209 {
 210         tftp_prev_block = 0;
 211         tftp_block_wrap = 0;
 212         tftp_block_wrap_offset = 0;
 213 #ifdef CONFIG_CMD_TFTPPUT
 214         tftp_put_final_block_sent = 0;
 215 #endif
 216 }
 217
 218 #ifdef CONFIG_CMD_TFTPPUT
 219 /**
 220  * Load the next block from memory to be sent over tftp.
 221  *
 222  * @param block Block number to send
 223  * @param dst   Destination buffer for data
 224  * @param len   Number of bytes in block (this one and every other)
 225  * @return number of bytes loaded
 226  */
 227 static int load_block(unsigned block, uchar *dst, unsigned len)
 228 {
 229         /* We may want to get the final block from the previous set */
 230         ulong offset = ((int)block - 1) * len + tftp_block_wrap_offset;
 231         ulong tosend = len;
 232
 233         tosend = min(net_boot_file_size - offset, tosend);
 234         (void)memcpy(dst, (void *)(save_addr + offset), tosend);
 235         debug("%s: block=%d, offset=%ld, len=%d, tosend=%ld\n", __func__,
 236               block, offset, len, tosend);
 237         return tosend;
 238 }
 239 #endif
 240
 241 static void tftp_send(void);
 242 static void tftp_timeout_handler(void);
 243
 244 /**********************************************************************/
 245
 246 static void show_block_marker(void)
 247 {
 248 #ifdef CONFIG_TFTP_TSIZE
 249         if (tftp_tsize) {
 250                 ulong pos = tftp_cur_block * tftp_block_size +
 251                         tftp_block_wrap_offset;
 252                 if (pos > tftp_tsize)
 253                         pos = tftp_tsize;
 254
 255                 while (tftp_tsize_num_hash < pos * 50 / tftp_tsize) {
 256                         putc('#');
 257                         tftp_tsize_num_hash++;
 258                 }
 259         } else
 260 #endif
 261         {
 262                 if (((tftp_cur_block - 1) % 10) == 0)
 263                         putc('#');
 264                 else if ((tftp_cur_block % (10 * HASHES_PER_LINE)) == 0)
 265                         puts("\n\t ");
 266         }
 267 }
 268
 269 /**
 270  * restart the current transfer due to an error
 271  *
 272  * @param msg   Message to print for user
 273  */
 274 static void restart(const char *msg)
 275 {
 276         printf("\n%s; starting again\n", msg);
 277 #ifdef CONFIG_MCAST_TFTP
 278         mcast_cleanup();
 279 #endif
 280         net_start_again();
 281 }
 282
 283 /*
 284  * Check if the block number has wrapped, and update progress
 285  *
 286  * TODO: The egregious use of global variables in this file should be tidied.
 287  */
 288 static void update_block_number(void)
 289 {
 290         /*
 291          * RFC1350 specifies that the first data packet will
 292          * have sequence number 1. If we receive a sequence
 293          * number of 0 this means that there was a wrap
 294          * around of the (16 bit) counter.
 295          */
 296         if (tftp_cur_block == 0 && tftp_prev_block != 0) {
 297                 tftp_block_wrap++;
 298                 tftp_block_wrap_offset += tftp_block_size * TFTP_SEQUENCE_SIZE;
 299                 timeout_count = 0; /* we've done well, reset the timeout */
 300         } else {
 301                 show_block_marker();
 302         }
 303 }
 304
 305 /* The TFTP get or put is complete */
 306 static void tftp_complete(void)
 307 {
 308 #ifdef CONFIG_TFTP_TSIZE
 309         /* Print hash marks for the last packet received */
 310         while (tftp_tsize && tftp_tsize_num_hash < 49) {
 311                 putc('#');
 312                 tftp_tsize_num_hash++;
 313         }
 314         puts("  ");
 315         print_size(tftp_tsize, "");
 316 #endif
 317         time_start = get_timer(time_start);
 318         if (time_start > 0) {
 319                 puts("\n\t ");  /* Line up with "Loading: " */
 320                 print_size(net_boot_file_size /
 321                         time_start * 1000, "/s");
 322         }
 323         puts("\ndone\n");
 324         net_set_state(NETLOOP_SUCCESS);
 325 }
 326
 327 static void tftp_send(void)
 328 {
 329         uchar *pkt;
 330         uchar *xp;
 331         int len = 0;
 332         ushort *s;
 333
 334 #ifdef CONFIG_MCAST_TFTP
 335         /* Multicast TFTP.. non-MasterClients do not ACK data. */
 336         if (tftp_mcast_active && tftp_state == STATE_DATA &&
 337             tftp_mcast_master_client == 0)
 338                 return;
 339 #endif
 340         /*
 341          *      We will always be sending some sort of packet, so
 342          *      cobble together the packet headers now.
 343          */
 344         pkt = net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
 345
 346         switch (tftp_state) {
 347         case STATE_SEND_RRQ:
 348         case STATE_SEND_WRQ:
 349                 xp = pkt;
 350                 s = (ushort *)pkt;
 351 #ifdef CONFIG_CMD_TFTPPUT
 352                 *s++ = htons(tftp_state == STATE_SEND_RRQ ? TFTP_RRQ :
 353                         TFTP_WRQ);
 354 #else
 355                 *s++ = htons(TFTP_RRQ);
 356 #endif
 357                 pkt = (uchar *)s;
 358                 strcpy((char *)pkt, tftp_filename);
 359                 pkt += strlen(tftp_filename) + 1;
 360                 strcpy((char *)pkt, "octet");
 361                 pkt += 5 /*strlen("octet")*/ + 1;
 362                 strcpy((char *)pkt, "timeout");
 363                 pkt += 7 /*strlen("timeout")*/ + 1;
 364                 sprintf((char *)pkt, "%lu", timeout_ms / 1000);
 365                 debug("send option \"timeout %s\"\n", (char *)pkt);
 366                 pkt += strlen((char *)pkt) + 1;
 367 #ifdef CONFIG_TFTP_TSIZE
 368                 pkt += sprintf((char *)pkt, "tsize%c%u%c",
 369                                 0, net_boot_file_size, 0);
 370 #endif
 371                 /* try for more effic. blk size */
 372                 pkt += sprintf((char *)pkt, "blksize%c%d%c",
 373                                 0, tftp_block_size_option, 0);
 374 #ifdef CONFIG_MCAST_TFTP
 375                 /* Check all preconditions before even trying the option */
 376                 if (!tftp_mcast_disabled) {
 377                         tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
 378                         if (tftp_mcast_bitmap && eth_get_dev()->mcast) {
 379                                 free(tftp_mcast_bitmap);
 380                                 tftp_mcast_bitmap = NULL;
 381                                 pkt += sprintf((char *)pkt, "multicast%c%c",
 382                                         0, 0);
 383                         }
 384                 }
 385 #endif /* CONFIG_MCAST_TFTP */
 386                 len = pkt - xp;
 387                 break;
 388
 389         case STATE_OACK:
 390 #ifdef CONFIG_MCAST_TFTP
 391                 /* My turn!  Start at where I need blocks I missed. */
 392                 if (tftp_mcast_active)
 393                         tftp_cur_block = ext2_find_next_zero_bit(
 394                                 tftp_mcast_bitmap,
 395                                 tftp_mcast_bitmap_size * 8, 0);
 396                 /* fall through */
 397 #endif
 398
 399         case STATE_RECV_WRQ:
 400         case STATE_DATA:
 401                 xp = pkt;
 402                 s = (ushort *)pkt;
 403                 s[0] = htons(TFTP_ACK);
 404                 s[1] = htons(tftp_cur_block);
 405                 pkt = (uchar *)(s + 2);
 406 #ifdef CONFIG_CMD_TFTPPUT
 407                 if (tftp_put_active) {
 408                         int toload = tftp_block_size;
 409                         int loaded = load_block(tftp_cur_block, pkt, toload);
 410
 411                         s[0] = htons(TFTP_DATA);
 412                         pkt += loaded;
 413                         tftp_put_final_block_sent = (loaded < toload);
 414                 }
 415 #endif
 416                 len = pkt - xp;
 417                 break;
 418
 419         case STATE_TOO_LARGE:
 420                 xp = pkt;
 421                 s = (ushort *)pkt;
 422                 *s++ = htons(TFTP_ERROR);
 423                         *s++ = htons(3);
 424
 425                 pkt = (uchar *)s;
 426                 strcpy((char *)pkt, "File too large");
 427                 pkt += 14 /*strlen("File too large")*/ + 1;
 428                 len = pkt - xp;
 429                 break;
 430
 431         case STATE_BAD_MAGIC:
 432                 xp = pkt;
 433                 s = (ushort *)pkt;
 434                 *s++ = htons(TFTP_ERROR);
 435                 *s++ = htons(2);
 436                 pkt = (uchar *)s;
 437                 strcpy((char *)pkt, "File has bad magic");
 438                 pkt += 18 /*strlen("File has bad magic")*/ + 1;
 439                 len = pkt - xp;
 440                 break;
 441         }
 442
 443         net_send_udp_packet(net_server_ethaddr, tftp_remote_ip,
 444                             tftp_remote_port, tftp_our_port, len);
 445 }
 446
 447 #ifdef CONFIG_CMD_TFTPPUT
 448 static void icmp_handler(unsigned type, unsigned code, unsigned dest,
 449                          struct in_addr sip, unsigned src, uchar *pkt,
 450                          unsigned len)
 451 {
 452         if (type == ICMP_NOT_REACH && code == ICMP_NOT_REACH_PORT) {
 453                 /* Oh dear the other end has gone away */
 454                 restart("TFTP server died");
 455         }
 456 }
 457 #endif
 458
 459 static void tftp_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 460                          unsigned src, unsigned len)
 461 {
 462         __be16 proto;
 463         __be16 *s;
 464         int i;
 465
 466         if (dest != tftp_our_port) {
 467 #ifdef CONFIG_MCAST_TFTP
 468                 if (tftp_mcast_active &&
 469                     (!tftp_mcast_port || dest != tftp_mcast_port))
 470 #endif
 471                         return;
 472         }
 473         if (tftp_state != STATE_SEND_RRQ && src != tftp_remote_port &&
 474             tftp_state != STATE_RECV_WRQ && tftp_state != STATE_SEND_WRQ)
 475                 return;
 476
 477         if (len < 2)
 478                 return;
 479         len -= 2;
 480         /* warning: don't use increment (++) in ntohs() macros!! */
 481         s = (__be16 *)pkt;
 482         proto = *s++;
 483         pkt = (uchar *)s;
 484         switch (ntohs(proto)) {
 485         case TFTP_RRQ:
 486                 break;
 487
 488         case TFTP_ACK:
 489 #ifdef CONFIG_CMD_TFTPPUT
 490                 if (tftp_put_active) {
 491                         if (tftp_put_final_block_sent) {
 492                                 tftp_complete();
 493                         } else {
 494                                 /*
 495                                  * Move to the next block. We want our block
 496                                  * count to wrap just like the other end!
 497                                  */
 498                                 int block = ntohs(*s);
 499                                 int ack_ok = (tftp_cur_block == block);
 500
 501                                 tftp_cur_block = (unsigned short)(block + 1);
 502                                 update_block_number();
 503                                 if (ack_ok)
 504                                         tftp_send(); /* Send next data block */
 505                         }
 506                 }
 507 #endif
 508                 break;
 509
 510         default:
 511                 break;
 512
 513 #ifdef CONFIG_CMD_TFTPSRV
 514         case TFTP_WRQ:
 515                 debug("Got WRQ\n");
 516                 tftp_remote_ip = sip;
 517                 tftp_remote_port = src;
 518                 tftp_our_port = 1024 + (get_timer(0) % 3072);
 519                 new_transfer();
 520                 tftp_send(); /* Send ACK(0) */
 521                 break;
 522 #endif
 523
 524         case TFTP_OACK:
 525                 debug("Got OACK: %s %s\n",
 526                       pkt, pkt + strlen((char *)pkt) + 1);
 527                 tftp_state = STATE_OACK;
 528                 tftp_remote_port = src;
 529                 /*
 530                  * Check for 'blksize' option.
 531                  * Careful: "i" is signed, "len" is unsigned, thus
 532                  * something like "len-8" may give a *huge* number
 533                  */
 534                 for (i = 0; i+8 < len; i++) {
 535                         if (strcmp((char *)pkt + i, "blksize") == 0) {
 536                                 tftp_block_size = (unsigned short)
 537                                         simple_strtoul((char *)pkt + i + 8,
 538                                                        NULL, 10);
 539                                 debug("Blocksize ack: %s, %d\n",
 540                                       (char *)pkt + i + 8, tftp_block_size);
 541                         }
 542 #ifdef CONFIG_TFTP_TSIZE
 543                         if (strcmp((char *)pkt+i, "tsize") == 0) {
 544                                 tftp_tsize = simple_strtoul((char *)pkt + i + 6,
 545                                                            NULL, 10);
 546                                 debug("size = %s, %d\n",
 547                                       (char *)pkt + i + 6, tftp_tsize);
 548                         }
 549 #endif
 550                 }
 551 #ifdef CONFIG_MCAST_TFTP
 552                 parse_multicast_oack((char *)pkt, len - 1);
 553                 if ((tftp_mcast_active) && (!tftp_mcast_master_client))
 554                         tftp_state = STATE_DATA;        /* passive.. */
 555                 else
 556 #endif
 557 #ifdef CONFIG_CMD_TFTPPUT
 558                 if (tftp_put_active) {
 559                         /* Get ready to send the first block */
 560                         tftp_state = STATE_DATA;
 561                         tftp_cur_block++;
 562                 }
 563 #endif
 564                 tftp_send(); /* Send ACK or first data block */
 565                 break;
 566         case TFTP_DATA:
 567                 if (len < 2)
 568                         return;
 569                 len -= 2;
 570                 tftp_cur_block = ntohs(*(__be16 *)pkt);
 571
 572                 update_block_number();
 573
 574                 if (tftp_state == STATE_SEND_RRQ)
 575                         debug("Server did not acknowledge timeout option!\n");
 576
 577                 if (tftp_state == STATE_SEND_RRQ || tftp_state == STATE_OACK ||
 578                     tftp_state == STATE_RECV_WRQ) {
 579                         /* first block received */
 580                         tftp_state = STATE_DATA;
 581                         tftp_remote_port = src;
 582                         new_transfer();
 583
 584 #ifdef CONFIG_MCAST_TFTP
 585                         if (tftp_mcast_active) { /* start!=1 common if mcast */
 586                                 tftp_prev_block = tftp_cur_block - 1;
 587                         } else
 588 #endif
 589                         if (tftp_cur_block != 1) {      /* Assertion */
 590                                 puts("\nTFTP error: ");
 591                                 printf("First block is not block 1 (%ld)\n",
 592                                        tftp_cur_block);
 593                                 puts("Starting again\n\n");
 594                                 net_start_again();
 595                                 break;
 596                         }
 597                 }
 598
 599                 if (tftp_cur_block == tftp_prev_block) {
 600                         /* Same block again; ignore it. */
 601                         break;
 602                 }
 603
 604                 tftp_prev_block = tftp_cur_block;
 605                 timeout_count_max = TIMEOUT_COUNT;
 606                 net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 607
 608                 store_block(tftp_cur_block - 1, pkt + 2, len);
 609
 610                 /*
 611                  *      Acknowledge the block just received, which will prompt
 612                  *      the remote for the next one.
 613                  */
 614 #ifdef CONFIG_MCAST_TFTP
 615                 /* if I am the MasterClient, actively calculate what my next
 616                  * needed block is; else I'm passive; not ACKING
 617                  */
 618                 if (tftp_mcast_active) {
 619                         if (len < tftp_block_size)  {
 620                                 tftp_mcast_ending_block = tftp_cur_block;
 621                         } else if (tftp_mcast_master_client) {
 622                                 tftp_mcast_prev_hole = ext2_find_next_zero_bit(
 623                                         tftp_mcast_bitmap,
 624                                         tftp_mcast_bitmap_size * 8,
 625                                         tftp_mcast_prev_hole);
 626                                 tftp_cur_block = tftp_mcast_prev_hole;
 627                                 if (tftp_cur_block >
 628                                     ((tftp_mcast_bitmap_size * 8) - 1)) {
 629                                         debug("tftpfile too big\n");
 630                                         /* try to double it and retry */
 631                                         tftp_mcast_bitmap_size <<= 1;
 632                                         mcast_cleanup();
 633                                         net_start_again();
 634                                         return;
 635                                 }
 636                                 tftp_prev_block = tftp_cur_block;
 637                         }
 638                 }
 639 #endif
 640                 tftp_send();
 641
 642 #ifdef CONFIG_MCAST_TFTP
 643                 if (tftp_mcast_active) {
 644                         if (tftp_mcast_master_client &&
 645                             (tftp_cur_block >= tftp_mcast_ending_block)) {
 646                                 puts("\nMulticast tftp done\n");
 647                                 mcast_cleanup();
 648                                 net_set_state(NETLOOP_SUCCESS);
 649                         }
 650                 } else
 651 #endif
 652                 if (len < tftp_block_size)
 653                         tftp_complete();
 654                 break;
 655
 656         case TFTP_ERROR:
 657                 printf("\nTFTP error: '%s' (%d)\n",
 658                        pkt + 2, ntohs(*(__be16 *)pkt));
 659
 660                 switch (ntohs(*(__be16 *)pkt)) {
 661                 case TFTP_ERR_FILE_NOT_FOUND:
 662                 case TFTP_ERR_ACCESS_DENIED:
 663                         puts("Not retrying...\n");
 664                         eth_halt();
 665                         net_set_state(NETLOOP_FAIL);
 666                         break;
 667                 case TFTP_ERR_UNDEFINED:
 668                 case TFTP_ERR_DISK_FULL:
 669                 case TFTP_ERR_UNEXPECTED_OPCODE:
 670                 case TFTP_ERR_UNKNOWN_TRANSFER_ID:
 671                 case TFTP_ERR_FILE_ALREADY_EXISTS:
 672                 default:
 673                         puts("Starting again\n\n");
 674 #ifdef CONFIG_MCAST_TFTP
 675                         mcast_cleanup();
 676 #endif
 677                         net_start_again();
 678                         break;
 679                 }
 680                 break;
 681         }
 682 }
 683
 684
 685 static void tftp_timeout_handler(void)
 686 {
 687         if (++timeout_count > timeout_count_max) {
 688                 restart("Retry count exceeded");
 689         } else {
 690                 puts("T ");
 691                 net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 692                 if (tftp_state != STATE_RECV_WRQ)
 693                         tftp_send();
 694         }
 695 }
 696
 697
 698 void tftp_start(enum proto_t protocol)
 699 {
 700         char *ep;             /* Environment pointer */
 701
 702         /*
 703          * Allow the user to choose TFTP blocksize and timeout.
 704          * TFTP protocol has a minimal timeout of 1 second.
 705          */
 706         ep = getenv("tftpblocksize");
 707         if (ep != NULL)
 708                 tftp_block_size_option = simple_strtol(ep, NULL, 10);
 709
 710         ep = getenv("tftptimeout");
 711         if (ep != NULL)
 712                 timeout_ms = simple_strtol(ep, NULL, 10);
 713
 714         if (timeout_ms < 10) {
 715                 printf("TFTP timeout (%ld ms) too low, set min = 10 ms\n",
 716                        timeout_ms);
 717                 timeout_ms = 10;
 718         }
 719
 720         debug("TFTP blocksize = %i, timeout = %ld ms\n",
 721               tftp_block_size_option, timeout_ms);
 722
 723         tftp_remote_ip = net_server_ip;
 724         if (net_boot_file_name[0] == '\0') {
 725                 sprintf(default_filename, "%02X%02X%02X%02X.img",
 726                         net_ip.s_addr & 0xFF,
 727                         (net_ip.s_addr >>  8) & 0xFF,
 728                         (net_ip.s_addr >> 16) & 0xFF,
 729                         (net_ip.s_addr >> 24) & 0xFF);
 730
 731                 strncpy(tftp_filename, default_filename, MAX_LEN);
 732                 tftp_filename[MAX_LEN - 1] = 0;
 733
 734                 printf("*** Warning: no boot file name; using '%s'\n",
 735                        tftp_filename);
 736         } else {
 737                 char *p = strchr(net_boot_file_name, ':');
 738
 739                 if (p == NULL) {
 740                         strncpy(tftp_filename, net_boot_file_name, MAX_LEN);
 741                         tftp_filename[MAX_LEN - 1] = 0;
 742                 } else {
 743                         tftp_remote_ip = string_to_ip(net_boot_file_name);
 744                         strncpy(tftp_filename, p + 1, MAX_LEN);
 745                         tftp_filename[MAX_LEN - 1] = 0;
 746                 }
 747         }
 748
 749         printf("Using %s device\n", eth_get_name());
 750         printf("TFTP %s server %pI4; our IP address is %pI4",
 751 #ifdef CONFIG_CMD_TFTPPUT
 752                protocol == TFTPPUT ? "to" : "from",
 753 #else
 754                "from",
 755 #endif
 756                &tftp_remote_ip, &net_ip);
 757
 758         /* Check if we need to send across this subnet */
 759         if (net_gateway.s_addr && net_netmask.s_addr) {
 760                 struct in_addr our_net;
 761                 struct in_addr remote_net;
 762
 763                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 764                 remote_net.s_addr = tftp_remote_ip.s_addr & net_netmask.s_addr;
 765                 if (our_net.s_addr != remote_net.s_addr)
 766                         printf("; sending through gateway %pI4", &net_gateway);
 767         }
 768         putc('\n');
 769
 770         printf("Filename '%s'.", tftp_filename);
 771
 772         if (net_boot_file_expected_size_in_blocks) {
 773                 printf(" Size is 0x%x Bytes = ",
 774                        net_boot_file_expected_size_in_blocks << 9);
 775                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 776         }
 777
 778         putc('\n');
 779 #ifdef CONFIG_CMD_TFTPPUT
 780         tftp_put_active = (protocol == TFTPPUT);
 781         if (tftp_put_active) {
 782                 printf("Save address: 0x%lx\n", save_addr);
 783                 printf("Save size:    0x%lx\n", save_size);
 784                 net_boot_file_size = save_size;
 785                 puts("Saving: *\b");
 786                 tftp_state = STATE_SEND_WRQ;
 787                 new_transfer();
 788         } else
 789 #endif
 790         {
 791                 printf("Load address: 0x%lx\n", load_addr);
 792                 puts("Loading: *\b");
 793                 tftp_state = STATE_SEND_RRQ;
 794         }
 795
 796         time_start = get_timer(0);
 797         timeout_count_max = tftp_timeout_count_max;
 798
 799         net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 800         net_set_udp_handler(tftp_handler);
 801 #ifdef CONFIG_CMD_TFTPPUT
 802         net_set_icmp_handler(icmp_handler);
 803 #endif
 804         tftp_remote_port = WELL_KNOWN_PORT;
 805         timeout_count = 0;
 806         /* Use a pseudo-random port unless a specific port is set */
 807         tftp_our_port = 1024 + (get_timer(0) % 3072);
 808
 809 #ifdef CONFIG_TFTP_PORT
 810         ep = getenv("tftpdstp");
 811         if (ep != NULL)
 812                 tftp_remote_port = simple_strtol(ep, NULL, 10);
 813         ep = getenv("tftpsrcp");
 814         if (ep != NULL)
 815                 tftp_our_port = simple_strtol(ep, NULL, 10);
 816 #endif
 817         tftp_cur_block = 0;
 818
 819         /* zero out server ether in case the server ip has changed */
 820         memset(net_server_ethaddr, 0, 6);
 821         /* Revert tftp_block_size to dflt */
 822         tftp_block_size = TFTP_BLOCK_SIZE;
 823 #ifdef CONFIG_MCAST_TFTP
 824         mcast_cleanup();
 825 #endif
 826 #ifdef CONFIG_TFTP_TSIZE
 827         tftp_tsize = 0;
 828         tftp_tsize_num_hash = 0;
 829 #endif
 830
 831         tftp_send();
 832 }
 833
 834 #ifdef CONFIG_CMD_TFTPSRV
 835 void tftp_start_server(void)
 836 {
 837         tftp_filename[0] = 0;
 838
 839         printf("Using %s device\n", eth_get_name());
 840         printf("Listening for TFTP transfer on %pI4\n", &net_ip);
 841         printf("Load address: 0x%lx\n", load_addr);
 842
 843         puts("Loading: *\b");
 844
 845         timeout_count_max = TIMEOUT_COUNT;
 846         timeout_count = 0;
 847         timeout_ms = TIMEOUT;
 848         net_set_timeout_handler(timeout_ms, tftp_timeout_handler);
 849
 850         /* Revert tftp_block_size to dflt */
 851         tftp_block_size = TFTP_BLOCK_SIZE;
 852         tftp_cur_block = 0;
 853         tftp_our_port = WELL_KNOWN_PORT;
 854
 855 #ifdef CONFIG_TFTP_TSIZE
 856         tftp_tsize = 0;
 857         tftp_tsize_num_hash = 0;
 858 #endif
 859
 860         tftp_state = STATE_RECV_WRQ;
 861         net_set_udp_handler(tftp_handler);
 862
 863         /* zero out server ether in case the server ip has changed */
 864         memset(net_server_ethaddr, 0, 6);
 865 }
 866 #endif /* CONFIG_CMD_TFTPSRV */
 867
 868 #ifdef CONFIG_MCAST_TFTP
 869 /*
 870  * Credits: atftp project.
 871  */
 872
 873 /*
 874  * Pick up BcastAddr, Port, and whether I am [now] the master-client.
 875  * Frame:
 876  *    +-------+-----------+---+-------~~-------+---+
 877  *    |  opc  | multicast | 0 | addr, port, mc | 0 |
 878  *    +-------+-----------+---+-------~~-------+---+
 879  * The multicast addr/port becomes what I listen to, and if 'mc' is '1' then
 880  * I am the new master-client so must send ACKs to DataBlocks.  If I am not
 881  * master-client, I'm a passive client, gathering what DataBlocks I may and
 882  * making note of which ones I got in my bitmask.
 883  * In theory, I never go from master->passive..
 884  * .. this comes in with pkt already pointing just past opc
 885  */
 886 static void parse_multicast_oack(char *pkt, int len)
 887 {
 888         int i;
 889         struct in_addr addr;
 890         char *mc_adr;
 891         char *port;
 892         char *mc;
 893
 894         mc_adr = NULL;
 895         port = NULL;
 896         mc = NULL;
 897         /* march along looking for 'multicast\0', which has to start at least
 898          * 14 bytes back from the end.
 899          */
 900         for (i = 0; i < len - 14; i++)
 901                 if (strcmp(pkt + i, "multicast") == 0)
 902                         break;
 903         if (i >= (len - 14)) /* non-Multicast OACK, ign. */
 904                 return;
 905
 906         i += 10; /* strlen multicast */
 907         mc_adr = pkt + i;
 908         for (; i < len; i++) {
 909                 if (*(pkt + i) == ',') {
 910                         *(pkt + i) = '\0';
 911                         if (port) {
 912                                 mc = pkt + i + 1;
 913                                 break;
 914                         } else {
 915                                 port = pkt + i + 1;
 916                         }
 917                 }
 918         }
 919         if (!port || !mc_adr || !mc)
 920                 return;
 921         if (tftp_mcast_active && tftp_mcast_master_client) {
 922                 printf("I got a OACK as master Client, WRONG!\n");
 923                 return;
 924         }
 925         /* ..I now accept packets destined for this MCAST addr, port */
 926         if (!tftp_mcast_active) {
 927                 if (tftp_mcast_bitmap) {
 928                         printf("Internal failure! no mcast.\n");
 929                         free(tftp_mcast_bitmap);
 930                         tftp_mcast_bitmap = NULL;
 931                         tftp_mcast_disabled = 1;
 932                         return;
 933                 }
 934                 /* I malloc instead of pre-declare; so that if the file ends
 935                  * up being too big for this bitmap I can retry
 936                  */
 937                 tftp_mcast_bitmap = malloc(tftp_mcast_bitmap_size);
 938                 if (!tftp_mcast_bitmap) {
 939                         printf("No bitmap, no multicast. Sorry.\n");
 940                         tftp_mcast_disabled = 1;
 941                         return;
 942                 }
 943                 memset(tftp_mcast_bitmap, 0, tftp_mcast_bitmap_size);
 944                 tftp_mcast_prev_hole = 0;
 945                 tftp_mcast_active = 1;
 946         }
 947         addr = string_to_ip(mc_adr);
 948         if (net_mcast_addr.s_addr != addr.s_addr) {
 949                 if (net_mcast_addr.s_addr)
 950                         eth_mcast_join(net_mcast_addr, 0);
 951                 net_mcast_addr = addr;
 952                 if (eth_mcast_join(net_mcast_addr, 1)) {
 953                         printf("Fail to set mcast, revert to TFTP\n");
 954                         tftp_mcast_disabled = 1;
 955                         mcast_cleanup();
 956                         net_start_again();
 957                 }
 958         }
 959         tftp_mcast_master_client = simple_strtoul((char *)mc, NULL, 10);
 960         tftp_mcast_port = (unsigned short)simple_strtoul(port, NULL, 10);
 961         printf("Multicast: %s:%d [%d]\n", mc_adr, tftp_mcast_port,
 962                tftp_mcast_master_client);
 963         return;
 964 }
 965
 966 #endif /* Multicast TFTP */