net/nfs.c

   1 /*
   2  * NFS support driver - based on etherboot and U-BOOT's tftp.c
   3  *
   4  * Masami Komiya <mkomiya@sonare.it> 2004
   5  *
   6  */
   7
   8 /* NOTE: the NFS code is heavily inspired by the NetBSD netboot code (read:
   9  * large portions are copied verbatim) as distributed in OSKit 0.97.  A few
  10  * changes were necessary to adapt the code to Etherboot and to fix several
  11  * inconsistencies.  Also the RPC message preparation is done "by hand" to
  12  * avoid adding netsprintf() which I find hard to understand and use.  */
  13
  14 /* NOTE 2: Etherboot does not care about things beyond the kernel image, so
  15  * it loads the kernel image off the boot server (ARP_SERVER) and does not
  16  * access the client root disk (root-path in dhcpd.conf), which would use
  17  * ARP_ROOTSERVER.  The root disk is something the operating system we are
  18  * about to load needs to use.  This is different from the OSKit 0.97 logic.  */
  19
  20 /* NOTE 3: Symlink handling introduced by Anselm M Hoffmeister, 2003-July-14
  21  * If a symlink is encountered, it is followed as far as possible (recursion
  22  * possible, maximum 16 steps). There is no clearing of ".."'s inside the
  23  * path, so please DON'T DO THAT. thx. */
  24
  25 #include <common.h>
  26 #include <command.h>
  27 #include <net.h>
  28 #include <malloc.h>
  29 #include "nfs.h"
  30 #include "bootp.h"
  31
  32 /*#define NFS_DEBUG*/
  33
  34 #if defined(CONFIG_CMD_NET) && defined(CONFIG_CMD_NFS)
  35
  36 #define HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  37 #define NFS_TIMEOUT 60UL
  38
  39 static int fs_mounted = 0;
  40 static unsigned long rpc_id = 0;
  41 static int nfs_offset = -1;
  42 static int nfs_len;
  43
  44 static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  45 static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  46
  47 static int      NfsDownloadState;
  48 static IPaddr_t NfsServerIP;
  49 static int      NfsSrvMountPort;
  50 static int      NfsSrvNfsPort;
  51 static int      NfsOurPort;
  52 static int      NfsTimeoutCount;
  53 static int      NfsState;
  54 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  55 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  56 #define STATE_MOUNT_REQ                 3
  57 #define STATE_UMOUNT_REQ                4
  58 #define STATE_LOOKUP_REQ                5
  59 #define STATE_READ_REQ                  6
  60 #define STATE_READLINK_REQ              7
  61
  62 static char default_filename[64];
  63 static char *nfs_filename;
  64 static char *nfs_path;
  65 static char nfs_path_buff[2048];
  66
  67 static __inline__ int
  68 store_block (uchar * src, unsigned offset, unsigned len)
  69 {
  70         ulong newsize = offset + len;
  71 #ifdef CFG_DIRECT_FLASH_NFS
  72         int i, rc = 0;
  73
  74         for (i=0; i<CFG_MAX_FLASH_BANKS; i++) {
  75                 /* start address in flash? */
  76                 if (load_addr + offset >= flash_info[i].start[0]) {
  77                         rc = 1;
  78                         break;
  79                 }
  80         }
  81
  82         if (rc) { /* Flash is destination for this packet */
  83                 rc = flash_write ((uchar *)src, (ulong)(load_addr+offset), len);
  84                 if (rc) {
  85                         flash_perror (rc);
  86                         return -1;
  87                 }
  88         } else
  89 #endif /* CFG_DIRECT_FLASH_NFS */
  90         {
  91                 (void)memcpy ((void *)(load_addr + offset), src, len);
  92         }
  93
  94         if (NetBootFileXferSize < (offset+len))
  95                 NetBootFileXferSize = newsize;
  96         return 0;
  97 }
  98
  99 static char*
 100 basename (char *path)
 101 {
 102         char *fname;
 103
 104         fname = path + strlen(path) - 1;
 105         while (fname >= path) {
 106                 if (*fname == '/') {
 107                         fname++;
 108                         break;
 109                 }
 110                 fname--;
 111         }
 112         return fname;
 113 }
 114
 115 static char*
 116 dirname (char *path)
 117 {
 118         char *fname;
 119
 120         fname = basename (path);
 121         --fname;
 122         *fname = '\0';
 123         return path;
 124 }
 125
 126 /**************************************************************************
 127 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 128 **************************************************************************/
 129 static long *rpc_add_credentials (long *p)
 130 {
 131         int hl;
 132         int hostnamelen;
 133         char hostname[256];
 134
 135         strcpy (hostname, "");
 136         hostnamelen=strlen (hostname);
 137
 138         /* Here's the executive summary on authentication requirements of the
 139          * various NFS server implementations:  Linux accepts both AUTH_NONE
 140          * and AUTH_UNIX authentication (also accepts an empty hostname field
 141          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 142          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 143          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 144          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 145          * hostname).  */
 146
 147         hl = (hostnamelen + 3) & ~3;
 148
 149         /* Provide an AUTH_UNIX credential.  */
 150         *p++ = htonl(1);                /* AUTH_UNIX */
 151         *p++ = htonl(hl+20);            /* auth length */
 152         *p++ = htonl(0);                /* stamp */
 153         *p++ = htonl(hostnamelen);      /* hostname string */
 154         if (hostnamelen & 3) {
 155                 *(p + hostnamelen / 4) = 0; /* add zero padding */
 156         }
 157         memcpy (p, hostname, hostnamelen);
 158         p += hl / 4;
 159         *p++ = 0;                       /* uid */
 160         *p++ = 0;                       /* gid */
 161         *p++ = 0;                       /* auxiliary gid list */
 162
 163         /* Provide an AUTH_NONE verifier.  */
 164         *p++ = 0;                       /* AUTH_NONE */
 165         *p++ = 0;                       /* auth length */
 166
 167         return p;
 168 }
 169
 170 /**************************************************************************
 171 RPC_LOOKUP - Lookup RPC Port numbers
 172 **************************************************************************/
 173 static void
 174 rpc_req (int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 175 {
 176         struct rpc_t pkt;
 177         unsigned long id;
 178         uint32_t *p;
 179         int pktlen;
 180         int sport;
 181
 182         id = ++rpc_id;
 183         pkt.u.call.id = htonl(id);
 184         pkt.u.call.type = htonl(MSG_CALL);
 185         pkt.u.call.rpcvers = htonl(2);  /* use RPC version 2 */
 186         pkt.u.call.prog = htonl(rpc_prog);
 187         pkt.u.call.vers = htonl(2);     /* portmapper is version 2 */
 188         pkt.u.call.proc = htonl(rpc_proc);
 189         p = (uint32_t *)&(pkt.u.call.data);
 190
 191         if (datalen)
 192                 memcpy ((char *)p, (char *)data, datalen*sizeof(uint32_t));
 193
 194         pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
 195
 196         memcpy ((char *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE, (char *)&pkt, pktlen);
 197
 198         if (rpc_prog == PROG_PORTMAP)
 199                 sport = SUNRPC_PORT;
 200         else if (rpc_prog == PROG_MOUNT)
 201                 sport = NfsSrvMountPort;
 202         else
 203                 sport = NfsSrvNfsPort;
 204
 205         NetSendUDPPacket (NetServerEther, NfsServerIP, sport, NfsOurPort, pktlen);
 206 }
 207
 208 /**************************************************************************
 209 RPC_LOOKUP - Lookup RPC Port numbers
 210 **************************************************************************/
 211 static void
 212 rpc_lookup_req (int prog, int ver)
 213 {
 214         uint32_t data[16];
 215
 216         data[0] = 0; data[1] = 0;       /* auth credential */
 217         data[2] = 0; data[3] = 0;       /* auth verifier */
 218         data[4] = htonl(prog);
 219         data[5] = htonl(ver);
 220         data[6] = htonl(17);    /* IP_UDP */
 221         data[7] = 0;
 222
 223         rpc_req (PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 224 }
 225
 226 /**************************************************************************
 227 NFS_MOUNT - Mount an NFS Filesystem
 228 **************************************************************************/
 229 static void
 230 nfs_mount_req (char *path)
 231 {
 232         uint32_t data[1024];
 233         uint32_t *p;
 234         int len;
 235         int pathlen;
 236
 237         pathlen = strlen (path);
 238
 239         p = &(data[0]);
 240         p = (uint32_t *)rpc_add_credentials((long *)p);
 241
 242         *p++ = htonl(pathlen);
 243         if (pathlen & 3) *(p + pathlen / 4) = 0;
 244         memcpy (p, path, pathlen);
 245         p += (pathlen + 3) / 4;
 246
 247         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 248
 249         rpc_req (PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 250 }
 251
 252 /**************************************************************************
 253 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 254 **************************************************************************/
 255 static void
 256 nfs_umountall_req (void)
 257 {
 258         uint32_t data[1024];
 259         uint32_t *p;
 260         int len;
 261
 262         if ((NfsSrvMountPort == -1) || (!fs_mounted)) {
 263                 /* Nothing mounted, nothing to umount */
 264                 return;
 265         }
 266
 267         p = &(data[0]);
 268         p = (uint32_t *)rpc_add_credentials ((long *)p);
 269
 270         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 271
 272         rpc_req (PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 273 }
 274
 275 /***************************************************************************
 276  * NFS_READLINK (AH 2003-07-14)
 277  * This procedure is called when read of the first block fails -
 278  * this probably happens when it's a directory or a symlink
 279  * In case of successful readlink(), the dirname is manipulated,
 280  * so that inside the nfs() function a recursion can be done.
 281  **************************************************************************/
 282 static void
 283 nfs_readlink_req (void)
 284 {
 285         uint32_t data[1024];
 286         uint32_t *p;
 287         int len;
 288
 289         p = &(data[0]);
 290         p = (uint32_t *)rpc_add_credentials ((long *)p);
 291
 292         memcpy (p, filefh, NFS_FHSIZE);
 293         p += (NFS_FHSIZE / 4);
 294
 295         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 296
 297         rpc_req (PROG_NFS, NFS_READLINK, data, len);
 298 }
 299
 300 /**************************************************************************
 301 NFS_LOOKUP - Lookup Pathname
 302 **************************************************************************/
 303 static void
 304 nfs_lookup_req (char *fname)
 305 {
 306         uint32_t data[1024];
 307         uint32_t *p;
 308         int len;
 309         int fnamelen;
 310
 311         fnamelen = strlen (fname);
 312
 313         p = &(data[0]);
 314         p = (uint32_t *)rpc_add_credentials ((long *)p);
 315
 316         memcpy (p, dirfh, NFS_FHSIZE);
 317         p += (NFS_FHSIZE / 4);
 318         *p++ = htonl(fnamelen);
 319         if (fnamelen & 3) *(p + fnamelen / 4) = 0;
 320         memcpy (p, fname, fnamelen);
 321         p += (fnamelen + 3) / 4;
 322
 323         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 324
 325         rpc_req (PROG_NFS, NFS_LOOKUP, data, len);
 326 }
 327
 328 /**************************************************************************
 329 NFS_READ - Read File on NFS Server
 330 **************************************************************************/
 331 static void
 332 nfs_read_req (int offset, int readlen)
 333 {
 334         uint32_t data[1024];
 335         uint32_t *p;
 336         int len;
 337
 338         p = &(data[0]);
 339         p = (uint32_t *)rpc_add_credentials ((long *)p);
 340
 341         memcpy (p, filefh, NFS_FHSIZE);
 342         p += (NFS_FHSIZE / 4);
 343         *p++ = htonl(offset);
 344         *p++ = htonl(readlen);
 345         *p++ = 0;
 346
 347         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 348
 349         rpc_req (PROG_NFS, NFS_READ, data, len);
 350 }
 351
 352 /**************************************************************************
 353 RPC request dispatcher
 354 **************************************************************************/
 355
 356 static void
 357 NfsSend (void)
 358 {
 359 #ifdef NFS_DEBUG
 360         printf ("%s\n", __FUNCTION__);
 361 #endif
 362
 363         switch (NfsState) {
 364         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 365                 rpc_lookup_req (PROG_MOUNT, 1);
 366                 break;
 367         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 368                 rpc_lookup_req (PROG_NFS, 2);
 369                 break;
 370         case STATE_MOUNT_REQ:
 371                 nfs_mount_req (nfs_path);
 372                 break;
 373         case STATE_UMOUNT_REQ:
 374                 nfs_umountall_req ();
 375                 break;
 376         case STATE_LOOKUP_REQ:
 377                 nfs_lookup_req (nfs_filename);
 378                 break;
 379         case STATE_READ_REQ:
 380                 nfs_read_req (nfs_offset, nfs_len);
 381                 break;
 382         case STATE_READLINK_REQ:
 383                 nfs_readlink_req ();
 384                 break;
 385         }
 386 }
 387
 388 /**************************************************************************
 389 Handlers for the reply from server
 390 **************************************************************************/
 391
 392 static int
 393 rpc_lookup_reply (int prog, uchar *pkt, unsigned len)
 394 {
 395         struct rpc_t rpc_pkt;
 396
 397         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 398
 399 #ifdef NFS_DEBUG
 400         printf ("%s\n", __FUNCTION__);
 401 #endif
 402
 403         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 404                 return -1;
 405
 406         if (rpc_pkt.u.reply.rstatus  ||
 407             rpc_pkt.u.reply.verifier ||
 408             rpc_pkt.u.reply.astatus) {
 409                 return -1;
 410         }
 411
 412         switch (prog) {
 413         case PROG_MOUNT:
 414                 NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]);
 415                 break;
 416         case PROG_NFS:
 417                 NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]);
 418                 break;
 419         }
 420
 421         return 0;
 422 }
 423
 424 static int
 425 nfs_mount_reply (uchar *pkt, unsigned len)
 426 {
 427         struct rpc_t rpc_pkt;
 428
 429 #ifdef NFS_DEBUG
 430         printf ("%s\n", __FUNCTION__);
 431 #endif
 432
 433         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 434
 435         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 436                 return -1;
 437
 438         if (rpc_pkt.u.reply.rstatus  ||
 439             rpc_pkt.u.reply.verifier ||
 440             rpc_pkt.u.reply.astatus  ||
 441             rpc_pkt.u.reply.data[0]) {
 442                 return -1;
 443         }
 444
 445         fs_mounted = 1;
 446         memcpy (dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 447
 448         return 0;
 449 }
 450
 451 static int
 452 nfs_umountall_reply (uchar *pkt, unsigned len)
 453 {
 454         struct rpc_t rpc_pkt;
 455
 456 #ifdef NFS_DEBUG
 457         printf ("%s\n", __FUNCTION__);
 458 #endif
 459
 460         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 461
 462         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 463                 return -1;
 464
 465         if (rpc_pkt.u.reply.rstatus  ||
 466             rpc_pkt.u.reply.verifier ||
 467             rpc_pkt.u.reply.astatus) {
 468                 return -1;
 469         }
 470
 471         fs_mounted = 0;
 472         memset (dirfh, 0, sizeof(dirfh));
 473
 474         return 0;
 475 }
 476
 477 static int
 478 nfs_lookup_reply (uchar *pkt, unsigned len)
 479 {
 480         struct rpc_t rpc_pkt;
 481
 482 #ifdef NFS_DEBUG
 483         printf ("%s\n", __FUNCTION__);
 484 #endif
 485
 486         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 487
 488         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 489                 return -1;
 490
 491         if (rpc_pkt.u.reply.rstatus  ||
 492             rpc_pkt.u.reply.verifier ||
 493             rpc_pkt.u.reply.astatus  ||
 494             rpc_pkt.u.reply.data[0]) {
 495                 return -1;
 496         }
 497
 498         memcpy (filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 499
 500         return 0;
 501 }
 502
 503 static int
 504 nfs_readlink_reply (uchar *pkt, unsigned len)
 505 {
 506         struct rpc_t rpc_pkt;
 507         int rlen;
 508
 509 #ifdef NFS_DEBUG
 510         printf ("%s\n", __FUNCTION__);
 511 #endif
 512
 513         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 514
 515         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 516                 return -1;
 517
 518         if (rpc_pkt.u.reply.rstatus  ||
 519             rpc_pkt.u.reply.verifier ||
 520             rpc_pkt.u.reply.astatus  ||
 521             rpc_pkt.u.reply.data[0]) {
 522                 return -1;
 523         }
 524
 525         rlen = ntohl (rpc_pkt.u.reply.data[1]); /* new path length */
 526
 527         if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
 528                 int pathlen;
 529                 strcat (nfs_path, "/");
 530                 pathlen = strlen(nfs_path);
 531                 memcpy (nfs_path+pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 532                 nfs_path[pathlen+rlen+1] = 0;
 533         } else {
 534                 memcpy (nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 535                 nfs_path[rlen] = 0;
 536         }
 537         return 0;
 538 }
 539
 540 static int
 541 nfs_read_reply (uchar *pkt, unsigned len)
 542 {
 543         struct rpc_t rpc_pkt;
 544         int rlen;
 545
 546 #ifdef NFS_DEBUG_nop
 547         printf ("%s\n", __FUNCTION__);
 548 #endif
 549
 550         memcpy ((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
 551
 552         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 553                 return -1;
 554
 555         if (rpc_pkt.u.reply.rstatus  ||
 556             rpc_pkt.u.reply.verifier ||
 557             rpc_pkt.u.reply.astatus  ||
 558             rpc_pkt.u.reply.data[0]) {
 559                 if (rpc_pkt.u.reply.rstatus) {
 560                         return -9999;
 561                 }
 562                 if (rpc_pkt.u.reply.astatus) {
 563                         return -9999;
 564                 }
 565                 return -ntohl(rpc_pkt.u.reply.data[0]);;
 566         }
 567
 568         if ((nfs_offset!=0) && !((nfs_offset) % (NFS_READ_SIZE/2*10*HASHES_PER_LINE))) {
 569                 puts ("\n\t ");
 570         }
 571         if (!(nfs_offset % ((NFS_READ_SIZE/2)*10))) {
 572                 putc ('#');
 573         }
 574
 575         rlen = ntohl(rpc_pkt.u.reply.data[18]);
 576         if ( store_block ((uchar *)pkt+sizeof(rpc_pkt.u.reply), nfs_offset, rlen) )
 577                 return -9999;
 578
 579         return rlen;
 580 }
 581
 582 /**************************************************************************
 583 Interfaces of U-BOOT
 584 **************************************************************************/
 585
 586 static void
 587 NfsTimeout (void)
 588 {
 589         puts ("Timeout\n");
 590         NetState = NETLOOP_FAIL;
 591         return;
 592 }
 593
 594 static void
 595 NfsHandler (uchar *pkt, unsigned dest, unsigned src, unsigned len)
 596 {
 597         int rlen;
 598
 599 #ifdef NFS_DEBUG
 600         printf ("%s\n", __FUNCTION__);
 601 #endif
 602
 603         if (dest != NfsOurPort) return;
 604
 605         switch (NfsState) {
 606         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 607                 rpc_lookup_reply (PROG_MOUNT, pkt, len);
 608                 NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ;
 609                 NfsSend ();
 610                 break;
 611
 612         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 613                 rpc_lookup_reply (PROG_NFS, pkt, len);
 614                 NfsState = STATE_MOUNT_REQ;
 615                 NfsSend ();
 616                 break;
 617
 618         case STATE_MOUNT_REQ:
 619                 if (nfs_mount_reply(pkt, len)) {
 620                         puts ("*** ERROR: Cannot mount\n");
 621                         /* just to be sure... */
 622                         NfsState = STATE_UMOUNT_REQ;
 623                         NfsSend ();
 624                 } else {
 625                         NfsState = STATE_LOOKUP_REQ;
 626                         NfsSend ();
 627                 }
 628                 break;
 629
 630         case STATE_UMOUNT_REQ:
 631                 if (nfs_umountall_reply(pkt, len)) {
 632                         puts ("*** ERROR: Cannot umount\n");
 633                         NetState = NETLOOP_FAIL;
 634                 } else {
 635                         puts ("\ndone\n");
 636                         NetState = NfsDownloadState;
 637                 }
 638                 break;
 639
 640         case STATE_LOOKUP_REQ:
 641                 if (nfs_lookup_reply(pkt, len)) {
 642                         puts ("*** ERROR: File lookup fail\n");
 643                         NfsState = STATE_UMOUNT_REQ;
 644                         NfsSend ();
 645                 } else {
 646                         NfsState = STATE_READ_REQ;
 647                         nfs_offset = 0;
 648                         nfs_len = NFS_READ_SIZE;
 649                         NfsSend ();
 650                 }
 651                 break;
 652
 653         case STATE_READLINK_REQ:
 654                 if (nfs_readlink_reply(pkt, len)) {
 655                         puts ("*** ERROR: Symlink fail\n");
 656                         NfsState = STATE_UMOUNT_REQ;
 657                         NfsSend ();
 658                 } else {
 659 #ifdef NFS_DEBUG
 660                         printf ("Symlink --> %s\n", nfs_path);
 661 #endif
 662                         nfs_filename = basename (nfs_path);
 663                         nfs_path     = dirname (nfs_path);
 664
 665                         NfsState = STATE_MOUNT_REQ;
 666                         NfsSend ();
 667                 }
 668                 break;
 669
 670         case STATE_READ_REQ:
 671                 rlen = nfs_read_reply (pkt, len);
 672                 NetSetTimeout (NFS_TIMEOUT * CFG_HZ, NfsTimeout);
 673                 if (rlen > 0) {
 674                         nfs_offset += rlen;
 675                         NfsSend ();
 676                 }
 677                 else if ((rlen == -NFSERR_ISDIR)||(rlen == -NFSERR_INVAL)) {
 678                         /* symbolic link */
 679                         NfsState = STATE_READLINK_REQ;
 680                         NfsSend ();
 681                 } else {
 682                         if ( ! rlen ) NfsDownloadState = NETLOOP_SUCCESS;
 683                         NfsState = STATE_UMOUNT_REQ;
 684                         NfsSend ();
 685                 }
 686                 break;
 687         }
 688 }
 689
 690
 691 void
 692 NfsStart (void)
 693 {
 694 #ifdef NFS_DEBUG
 695         printf ("%s\n", __FUNCTION__);
 696 #endif
 697         NfsDownloadState = NETLOOP_FAIL;
 698
 699         NfsServerIP = NetServerIP;
 700         nfs_path = (char *)nfs_path_buff;
 701
 702         if (nfs_path == NULL) {
 703                 NetState = NETLOOP_FAIL;
 704                 puts ("*** ERROR: Fail allocate memory\n");
 705                 return;
 706         }
 707
 708         if (BootFile[0] == '\0') {
 709                 sprintf (default_filename, "/nfsroot/%02lX%02lX%02lX%02lX.img",
 710                         NetOurIP & 0xFF,
 711                         (NetOurIP >>  8) & 0xFF,
 712                         (NetOurIP >> 16) & 0xFF,
 713                         (NetOurIP >> 24) & 0xFF );
 714                 strcpy (nfs_path, default_filename);
 715
 716                 printf ("*** Warning: no boot file name; using '%s'\n",
 717                         nfs_path);
 718         } else {
 719                 char *p=BootFile;
 720
 721                 p = strchr (p, ':');
 722
 723                 if (p != NULL) {
 724                         NfsServerIP = string_to_ip (BootFile);
 725                         ++p;
 726                         strcpy (nfs_path, p);
 727                 } else {
 728                         strcpy (nfs_path, BootFile);
 729                 }
 730         }
 731
 732         nfs_filename = basename (nfs_path);
 733         nfs_path     = dirname (nfs_path);
 734
 735 #if defined(CONFIG_NET_MULTI)
 736         printf ("Using %s device\n", eth_get_name());
 737 #endif
 738
 739         puts ("File transfer via NFS from server "); print_IPaddr (NfsServerIP);
 740         puts ("; our IP address is ");              print_IPaddr (NetOurIP);
 741
 742         /* Check if we need to send across this subnet */
 743         if (NetOurGatewayIP && NetOurSubnetMask) {
 744                 IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
 745                 IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
 746
 747                 if (OurNet != ServerNet) {
 748                         puts ("; sending through gateway ");
 749                         print_IPaddr (NetOurGatewayIP) ;
 750                 }
 751         }
 752         printf ("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 753
 754         if (NetBootFileSize) {
 755                 printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 756                 print_size (NetBootFileSize<<9, "");
 757         }
 758         printf ("\nLoad address: 0x%lx\n"
 759                 "Loading: *\b", load_addr);
 760
 761         NetSetTimeout (NFS_TIMEOUT * CFG_HZ, NfsTimeout);
 762         NetSetHandler (NfsHandler);
 763
 764         NfsTimeoutCount = 0;
 765         NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 766
 767         /*NfsOurPort = 4096 + (get_ticks() % 3072);*/
 768         /*FIX ME !!!*/
 769         NfsOurPort = 1000;
 770
 771         /* zero out server ether in case the server ip has changed */
 772         memset (NetServerEther, 0, 6);
 773
 774         NfsSend ();
 775 }
 776
 777 #endif