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 HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  33 #define NFS_RETRY_COUNT 30
  34 #define NFS_TIMEOUT 2000UL
  35
  36 static int fs_mounted = 0;
  37 static unsigned long rpc_id = 0;
  38 static int nfs_offset = -1;
  39 static int nfs_len;
  40
  41 static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  42 static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  43
  44 static int      NfsDownloadState;
  45 static IPaddr_t NfsServerIP;
  46 static int      NfsSrvMountPort;
  47 static int      NfsSrvNfsPort;
  48 static int      NfsOurPort;
  49 static int      NfsTimeoutCount;
  50 static int      NfsState;
  51 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  52 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  53 #define STATE_MOUNT_REQ                 3
  54 #define STATE_UMOUNT_REQ                4
  55 #define STATE_LOOKUP_REQ                5
  56 #define STATE_READ_REQ                  6
  57 #define STATE_READLINK_REQ              7
  58
  59 static char default_filename[64];
  60 static char *nfs_filename;
  61 static char *nfs_path;
  62 static char nfs_path_buff[2048];
  63
  64 static __inline__ int
  65 store_block (uchar * src, unsigned offset, unsigned len)
  66 {
  67         ulong newsize = offset + len;
  68 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  69         int i, rc = 0;
  70
  71         for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  72                 /* start address in flash? */
  73                 if (load_addr + offset >= flash_info[i].start[0]) {
  74                         rc = 1;
  75                         break;
  76                 }
  77         }
  78
  79         if (rc) { /* Flash is destination for this packet */
  80                 rc = flash_write ((uchar *)src, (ulong)(load_addr+offset), len);
  81                 if (rc) {
  82                         flash_perror (rc);
  83                         return -1;
  84                 }
  85         } else
  86 #endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
  87         {
  88                 (void)memcpy ((void *)(load_addr + offset), src, len);
  89         }
  90
  91         if (NetBootFileXferSize < (offset+len))
  92                 NetBootFileXferSize = newsize;
  93         return 0;
  94 }
  95
  96 static char*
  97 basename (char *path)
  98 {
  99         char *fname;
 100
 101         fname = path + strlen(path) - 1;
 102         while (fname >= path) {
 103                 if (*fname == '/') {
 104                         fname++;
 105                         break;
 106                 }
 107                 fname--;
 108         }
 109         return fname;
 110 }
 111
 112 static char*
 113 dirname (char *path)
 114 {
 115         char *fname;
 116
 117         fname = basename (path);
 118         --fname;
 119         *fname = '\0';
 120         return path;
 121 }
 122
 123 /**************************************************************************
 124 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 125 **************************************************************************/
 126 static long *rpc_add_credentials (long *p)
 127 {
 128         int hl;
 129         int hostnamelen;
 130         char hostname[256];
 131
 132         strcpy (hostname, "");
 133         hostnamelen=strlen (hostname);
 134
 135         /* Here's the executive summary on authentication requirements of the
 136          * various NFS server implementations:  Linux accepts both AUTH_NONE
 137          * and AUTH_UNIX authentication (also accepts an empty hostname field
 138          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 139          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 140          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 141          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 142          * hostname).  */
 143
 144         hl = (hostnamelen + 3) & ~3;
 145
 146         /* Provide an AUTH_UNIX credential.  */
 147         *p++ = htonl(1);                /* AUTH_UNIX */
 148         *p++ = htonl(hl+20);            /* auth length */
 149         *p++ = htonl(0);                /* stamp */
 150         *p++ = htonl(hostnamelen);      /* hostname string */
 151         if (hostnamelen & 3) {
 152                 *(p + hostnamelen / 4) = 0; /* add zero padding */
 153         }
 154         memcpy (p, hostname, hostnamelen);
 155         p += hl / 4;
 156         *p++ = 0;                       /* uid */
 157         *p++ = 0;                       /* gid */
 158         *p++ = 0;                       /* auxiliary gid list */
 159
 160         /* Provide an AUTH_NONE verifier.  */
 161         *p++ = 0;                       /* AUTH_NONE */
 162         *p++ = 0;                       /* auth length */
 163
 164         return p;
 165 }
 166
 167 /**************************************************************************
 168 RPC_LOOKUP - Lookup RPC Port numbers
 169 **************************************************************************/
 170 static void
 171 rpc_req (int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 172 {
 173         struct rpc_t pkt;
 174         unsigned long id;
 175         uint32_t *p;
 176         int pktlen;
 177         int sport;
 178
 179         id = ++rpc_id;
 180         pkt.u.call.id = htonl(id);
 181         pkt.u.call.type = htonl(MSG_CALL);
 182         pkt.u.call.rpcvers = htonl(2);  /* use RPC version 2 */
 183         pkt.u.call.prog = htonl(rpc_prog);
 184         pkt.u.call.vers = htonl(2);     /* portmapper is version 2 */
 185         pkt.u.call.proc = htonl(rpc_proc);
 186         p = (uint32_t *)&(pkt.u.call.data);
 187
 188         if (datalen)
 189                 memcpy ((char *)p, (char *)data, datalen*sizeof(uint32_t));
 190
 191         pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
 192
 193         memcpy ((char *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE, (char *)&pkt, pktlen);
 194
 195         if (rpc_prog == PROG_PORTMAP)
 196                 sport = SUNRPC_PORT;
 197         else if (rpc_prog == PROG_MOUNT)
 198                 sport = NfsSrvMountPort;
 199         else
 200                 sport = NfsSrvNfsPort;
 201
 202         NetSendUDPPacket (NetServerEther, NfsServerIP, sport, NfsOurPort, pktlen);
 203 }
 204
 205 /**************************************************************************
 206 RPC_LOOKUP - Lookup RPC Port numbers
 207 **************************************************************************/
 208 static void
 209 rpc_lookup_req (int prog, int ver)
 210 {
 211         uint32_t data[16];
 212
 213         data[0] = 0; data[1] = 0;       /* auth credential */
 214         data[2] = 0; data[3] = 0;       /* auth verifier */
 215         data[4] = htonl(prog);
 216         data[5] = htonl(ver);
 217         data[6] = htonl(17);    /* IP_UDP */
 218         data[7] = 0;
 219
 220         rpc_req (PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 221 }
 222
 223 /**************************************************************************
 224 NFS_MOUNT - Mount an NFS Filesystem
 225 **************************************************************************/
 226 static void
 227 nfs_mount_req (char *path)
 228 {
 229         uint32_t data[1024];
 230         uint32_t *p;
 231         int len;
 232         int pathlen;
 233
 234         pathlen = strlen (path);
 235
 236         p = &(data[0]);
 237         p = (uint32_t *)rpc_add_credentials((long *)p);
 238
 239         *p++ = htonl(pathlen);
 240         if (pathlen & 3) *(p + pathlen / 4) = 0;
 241         memcpy (p, path, pathlen);
 242         p += (pathlen + 3) / 4;
 243
 244         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 245
 246         rpc_req (PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 247 }
 248
 249 /**************************************************************************
 250 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 251 **************************************************************************/
 252 static void
 253 nfs_umountall_req (void)
 254 {
 255         uint32_t data[1024];
 256         uint32_t *p;
 257         int len;
 258
 259         if ((NfsSrvMountPort == -1) || (!fs_mounted)) {
 260                 /* Nothing mounted, nothing to umount */
 261                 return;
 262         }
 263
 264         p = &(data[0]);
 265         p = (uint32_t *)rpc_add_credentials ((long *)p);
 266
 267         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 268
 269         rpc_req (PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 270 }
 271
 272 /***************************************************************************
 273  * NFS_READLINK (AH 2003-07-14)
 274  * This procedure is called when read of the first block fails -
 275  * this probably happens when it's a directory or a symlink
 276  * In case of successful readlink(), the dirname is manipulated,
 277  * so that inside the nfs() function a recursion can be done.
 278  **************************************************************************/
 279 static void
 280 nfs_readlink_req (void)
 281 {
 282         uint32_t data[1024];
 283         uint32_t *p;
 284         int len;
 285
 286         p = &(data[0]);
 287         p = (uint32_t *)rpc_add_credentials ((long *)p);
 288
 289         memcpy (p, filefh, NFS_FHSIZE);
 290         p += (NFS_FHSIZE / 4);
 291
 292         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 293
 294         rpc_req (PROG_NFS, NFS_READLINK, data, len);
 295 }
 296
 297 /**************************************************************************
 298 NFS_LOOKUP - Lookup Pathname
 299 **************************************************************************/
 300 static void
 301 nfs_lookup_req (char *fname)
 302 {
 303         uint32_t data[1024];
 304         uint32_t *p;
 305         int len;
 306         int fnamelen;
 307
 308         fnamelen = strlen (fname);
 309
 310         p = &(data[0]);
 311         p = (uint32_t *)rpc_add_credentials ((long *)p);
 312
 313         memcpy (p, dirfh, NFS_FHSIZE);
 314         p += (NFS_FHSIZE / 4);
 315         *p++ = htonl(fnamelen);
 316         if (fnamelen & 3) *(p + fnamelen / 4) = 0;
 317         memcpy (p, fname, fnamelen);
 318         p += (fnamelen + 3) / 4;
 319
 320         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 321
 322         rpc_req (PROG_NFS, NFS_LOOKUP, data, len);
 323 }
 324
 325 /**************************************************************************
 326 NFS_READ - Read File on NFS Server
 327 **************************************************************************/
 328 static void
 329 nfs_read_req (int offset, int readlen)
 330 {
 331         uint32_t data[1024];
 332         uint32_t *p;
 333         int len;
 334
 335         p = &(data[0]);
 336         p = (uint32_t *)rpc_add_credentials ((long *)p);
 337
 338         memcpy (p, filefh, NFS_FHSIZE);
 339         p += (NFS_FHSIZE / 4);
 340         *p++ = htonl(offset);
 341         *p++ = htonl(readlen);
 342         *p++ = 0;
 343
 344         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 345
 346         rpc_req (PROG_NFS, NFS_READ, data, len);
 347 }
 348
 349 /**************************************************************************
 350 RPC request dispatcher
 351 **************************************************************************/
 352
 353 static void
 354 NfsSend (void)
 355 {
 356         debug("%s\n", __func__);
 357
 358         switch (NfsState) {
 359         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 360                 rpc_lookup_req (PROG_MOUNT, 1);
 361                 break;
 362         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 363                 rpc_lookup_req (PROG_NFS, 2);
 364                 break;
 365         case STATE_MOUNT_REQ:
 366                 nfs_mount_req (nfs_path);
 367                 break;
 368         case STATE_UMOUNT_REQ:
 369                 nfs_umountall_req ();
 370                 break;
 371         case STATE_LOOKUP_REQ:
 372                 nfs_lookup_req (nfs_filename);
 373                 break;
 374         case STATE_READ_REQ:
 375                 nfs_read_req (nfs_offset, nfs_len);
 376                 break;
 377         case STATE_READLINK_REQ:
 378                 nfs_readlink_req ();
 379                 break;
 380         }
 381 }
 382
 383 /**************************************************************************
 384 Handlers for the reply from server
 385 **************************************************************************/
 386
 387 static int
 388 rpc_lookup_reply (int prog, uchar *pkt, unsigned len)
 389 {
 390         struct rpc_t rpc_pkt;
 391
 392         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 393
 394         debug("%s\n", __func__);
 395
 396         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 397                 return -1;
 398
 399         if (rpc_pkt.u.reply.rstatus  ||
 400             rpc_pkt.u.reply.verifier ||
 401             rpc_pkt.u.reply.astatus) {
 402                 return -1;
 403         }
 404
 405         switch (prog) {
 406         case PROG_MOUNT:
 407                 NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]);
 408                 break;
 409         case PROG_NFS:
 410                 NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]);
 411                 break;
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int
 418 nfs_mount_reply (uchar *pkt, unsigned len)
 419 {
 420         struct rpc_t rpc_pkt;
 421
 422         debug("%s\n", __func__);
 423
 424         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 425
 426         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 427                 return -1;
 428
 429         if (rpc_pkt.u.reply.rstatus  ||
 430             rpc_pkt.u.reply.verifier ||
 431             rpc_pkt.u.reply.astatus  ||
 432             rpc_pkt.u.reply.data[0]) {
 433                 return -1;
 434         }
 435
 436         fs_mounted = 1;
 437         memcpy (dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 438
 439         return 0;
 440 }
 441
 442 static int
 443 nfs_umountall_reply (uchar *pkt, unsigned len)
 444 {
 445         struct rpc_t rpc_pkt;
 446
 447         debug("%s\n", __func__);
 448
 449         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 450
 451         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 452                 return -1;
 453
 454         if (rpc_pkt.u.reply.rstatus  ||
 455             rpc_pkt.u.reply.verifier ||
 456             rpc_pkt.u.reply.astatus) {
 457                 return -1;
 458         }
 459
 460         fs_mounted = 0;
 461         memset (dirfh, 0, sizeof(dirfh));
 462
 463         return 0;
 464 }
 465
 466 static int
 467 nfs_lookup_reply (uchar *pkt, unsigned len)
 468 {
 469         struct rpc_t rpc_pkt;
 470
 471         debug("%s\n", __func__);
 472
 473         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 474
 475         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 476                 return -1;
 477
 478         if (rpc_pkt.u.reply.rstatus  ||
 479             rpc_pkt.u.reply.verifier ||
 480             rpc_pkt.u.reply.astatus  ||
 481             rpc_pkt.u.reply.data[0]) {
 482                 return -1;
 483         }
 484
 485         memcpy (filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 486
 487         return 0;
 488 }
 489
 490 static int
 491 nfs_readlink_reply (uchar *pkt, unsigned len)
 492 {
 493         struct rpc_t rpc_pkt;
 494         int rlen;
 495
 496         debug("%s\n", __func__);
 497
 498         memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 499
 500         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 501                 return -1;
 502
 503         if (rpc_pkt.u.reply.rstatus  ||
 504             rpc_pkt.u.reply.verifier ||
 505             rpc_pkt.u.reply.astatus  ||
 506             rpc_pkt.u.reply.data[0]) {
 507                 return -1;
 508         }
 509
 510         rlen = ntohl (rpc_pkt.u.reply.data[1]); /* new path length */
 511
 512         if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
 513                 int pathlen;
 514                 strcat (nfs_path, "/");
 515                 pathlen = strlen(nfs_path);
 516                 memcpy (nfs_path+pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 517                 nfs_path[pathlen + rlen] = 0;
 518         } else {
 519                 memcpy (nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 520                 nfs_path[rlen] = 0;
 521         }
 522         return 0;
 523 }
 524
 525 static int
 526 nfs_read_reply (uchar *pkt, unsigned len)
 527 {
 528         struct rpc_t rpc_pkt;
 529         int rlen;
 530
 531         debug("%s\n", __func__);
 532
 533         memcpy ((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
 534
 535         if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 536                 return -1;
 537
 538         if (rpc_pkt.u.reply.rstatus  ||
 539             rpc_pkt.u.reply.verifier ||
 540             rpc_pkt.u.reply.astatus  ||
 541             rpc_pkt.u.reply.data[0]) {
 542                 if (rpc_pkt.u.reply.rstatus) {
 543                         return -9999;
 544                 }
 545                 if (rpc_pkt.u.reply.astatus) {
 546                         return -9999;
 547                 }
 548                 return -ntohl(rpc_pkt.u.reply.data[0]);;
 549         }
 550
 551         if ((nfs_offset!=0) && !((nfs_offset) % (NFS_READ_SIZE/2*10*HASHES_PER_LINE))) {
 552                 puts ("\n\t ");
 553         }
 554         if (!(nfs_offset % ((NFS_READ_SIZE/2)*10))) {
 555                 putc ('#');
 556         }
 557
 558         rlen = ntohl(rpc_pkt.u.reply.data[18]);
 559         if ( store_block ((uchar *)pkt+sizeof(rpc_pkt.u.reply), nfs_offset, rlen) )
 560                 return -9999;
 561
 562         return rlen;
 563 }
 564
 565 /**************************************************************************
 566 Interfaces of U-BOOT
 567 **************************************************************************/
 568
 569 static void
 570 NfsTimeout (void)
 571 {
 572         if ( ++NfsTimeoutCount > NFS_RETRY_COUNT ) {
 573                 puts ("\nRetry count exceeded; starting again\n");
 574                 NetStartAgain ();
 575         } else {
 576                 puts("T ");
 577                 NetSetTimeout (NFS_TIMEOUT, NfsTimeout);
 578                 NfsSend ();
 579         }
 580 }
 581
 582 static void
 583 NfsHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len)
 584 {
 585         int rlen;
 586
 587         debug("%s\n", __func__);
 588
 589         if (dest != NfsOurPort) return;
 590
 591         switch (NfsState) {
 592         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 593                 rpc_lookup_reply (PROG_MOUNT, pkt, len);
 594                 NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ;
 595                 NfsSend ();
 596                 break;
 597
 598         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 599                 rpc_lookup_reply (PROG_NFS, pkt, len);
 600                 NfsState = STATE_MOUNT_REQ;
 601                 NfsSend ();
 602                 break;
 603
 604         case STATE_MOUNT_REQ:
 605                 if (nfs_mount_reply(pkt, len)) {
 606                         puts ("*** ERROR: Cannot mount\n");
 607                         /* just to be sure... */
 608                         NfsState = STATE_UMOUNT_REQ;
 609                         NfsSend ();
 610                 } else {
 611                         NfsState = STATE_LOOKUP_REQ;
 612                         NfsSend ();
 613                 }
 614                 break;
 615
 616         case STATE_UMOUNT_REQ:
 617                 if (nfs_umountall_reply(pkt, len)) {
 618                         puts ("*** ERROR: Cannot umount\n");
 619                         NetState = NETLOOP_FAIL;
 620                 } else {
 621                         puts ("\ndone\n");
 622                         NetState = NfsDownloadState;
 623                 }
 624                 break;
 625
 626         case STATE_LOOKUP_REQ:
 627                 if (nfs_lookup_reply(pkt, len)) {
 628                         puts ("*** ERROR: File lookup fail\n");
 629                         NfsState = STATE_UMOUNT_REQ;
 630                         NfsSend ();
 631                 } else {
 632                         NfsState = STATE_READ_REQ;
 633                         nfs_offset = 0;
 634                         nfs_len = NFS_READ_SIZE;
 635                         NfsSend ();
 636                 }
 637                 break;
 638
 639         case STATE_READLINK_REQ:
 640                 if (nfs_readlink_reply(pkt, len)) {
 641                         puts ("*** ERROR: Symlink fail\n");
 642                         NfsState = STATE_UMOUNT_REQ;
 643                         NfsSend ();
 644                 } else {
 645                         debug("Symlink --> %s\n", nfs_path);
 646                         nfs_filename = basename (nfs_path);
 647                         nfs_path     = dirname (nfs_path);
 648
 649                         NfsState = STATE_MOUNT_REQ;
 650                         NfsSend ();
 651                 }
 652                 break;
 653
 654         case STATE_READ_REQ:
 655                 rlen = nfs_read_reply (pkt, len);
 656                 NetSetTimeout (NFS_TIMEOUT, NfsTimeout);
 657                 if (rlen > 0) {
 658                         nfs_offset += rlen;
 659                         NfsSend ();
 660                 }
 661                 else if ((rlen == -NFSERR_ISDIR)||(rlen == -NFSERR_INVAL)) {
 662                         /* symbolic link */
 663                         NfsState = STATE_READLINK_REQ;
 664                         NfsSend ();
 665                 } else {
 666                         if ( ! rlen ) NfsDownloadState = NETLOOP_SUCCESS;
 667                         NfsState = STATE_UMOUNT_REQ;
 668                         NfsSend ();
 669                 }
 670                 break;
 671         }
 672 }
 673
 674
 675 void
 676 NfsStart (void)
 677 {
 678         debug("%s\n", __func__);
 679         NfsDownloadState = NETLOOP_FAIL;
 680
 681         NfsServerIP = NetServerIP;
 682         nfs_path = (char *)nfs_path_buff;
 683
 684         if (nfs_path == NULL) {
 685                 NetState = NETLOOP_FAIL;
 686                 puts ("*** ERROR: Fail allocate memory\n");
 687                 return;
 688         }
 689
 690         if (BootFile[0] == '\0') {
 691                 sprintf(default_filename, "/nfsroot/%02X%02X%02X%02X.img",
 692                         NetOurIP & 0xFF,
 693                         (NetOurIP >>  8) & 0xFF,
 694                         (NetOurIP >> 16) & 0xFF,
 695                         (NetOurIP >> 24) & 0xFF );
 696                 strcpy (nfs_path, default_filename);
 697
 698                 printf ("*** Warning: no boot file name; using '%s'\n",
 699                         nfs_path);
 700         } else {
 701                 char *p=BootFile;
 702
 703                 p = strchr (p, ':');
 704
 705                 if (p != NULL) {
 706                         NfsServerIP = string_to_ip (BootFile);
 707                         ++p;
 708                         strcpy (nfs_path, p);
 709                 } else {
 710                         strcpy (nfs_path, BootFile);
 711                 }
 712         }
 713
 714         nfs_filename = basename (nfs_path);
 715         nfs_path     = dirname (nfs_path);
 716
 717         printf ("Using %s device\n", eth_get_name());
 718
 719         printf("File transfer via NFS from server %pI4"
 720                 "; our IP address is %pI4", &NfsServerIP, &NetOurIP);
 721
 722         /* Check if we need to send across this subnet */
 723         if (NetOurGatewayIP && NetOurSubnetMask) {
 724                 IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
 725                 IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
 726
 727                 if (OurNet != ServerNet)
 728                         printf("; sending through gateway %pI4", &NetOurGatewayIP);
 729         }
 730         printf ("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 731
 732         if (NetBootFileSize) {
 733                 printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 734                 print_size (NetBootFileSize<<9, "");
 735         }
 736         printf ("\nLoad address: 0x%lx\n"
 737                 "Loading: *\b", load_addr);
 738
 739         NetSetTimeout (NFS_TIMEOUT, NfsTimeout);
 740         NetSetHandler (NfsHandler);
 741
 742         NfsTimeoutCount = 0;
 743         NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 744
 745         /*NfsOurPort = 4096 + (get_ticks() % 3072);*/
 746         /*FIX ME !!!*/
 747         NfsOurPort = 1000;
 748
 749         /* zero out server ether in case the server ip has changed */
 750         memset (NetServerEther, 0, 6);
 751
 752         NfsSend ();
 753 }