LXR uboot/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_RETRY_COUNT 30
  38#define NFS_TIMEOUT 2000UL
  39
  40static int fs_mounted = 0;
  41static unsigned long rpc_id = 0;
  42static int nfs_offset = -1;
  43static int nfs_len;
  44
  45static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  46static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  47
  48static int      NfsDownloadState;
  49static IPaddr_t NfsServerIP;
  50static int      NfsSrvMountPort;
  51static int      NfsSrvNfsPort;
  52static int      NfsOurPort;
  53static int      NfsTimeoutCount;
  54static int      NfsState;
  55#define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  56#define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  57#define STATE_MOUNT_REQ                 3
  58#define STATE_UMOUNT_REQ                4
  59#define STATE_LOOKUP_REQ                5
  60#define STATE_READ_REQ                  6
  61#define STATE_READLINK_REQ              7
  62
  63static char default_filename[64];
  64static char *nfs_filename;
  65static char *nfs_path;
  66static char nfs_path_buff[2048];
  67
  68static __inline__ int
  69store_block (uchar * src, unsigned offset, unsigned len)
  70{
  71        ulong newsize = offset + len;
  72#ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  73        int i, rc = 0;
  74
  75        for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  76                /* start address in flash? */
  77                if (load_addr + offset >= flash_info[i].start[0]) {
  78                        rc = 1;
  79                        break;
  80                }
  81        }
  82
  83        if (rc) { /* Flash is destination for this packet */
  84                rc = flash_write ((uchar *)src, (ulong)(load_addr+offset), len);
  85                if (rc) {
  86                        flash_perror (rc);
  87                        return -1;
  88                }
  89        } else
  90#endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
  91        {
  92                (void)memcpy ((void *)(load_addr + offset), src, len);
  93        }
  94
  95        if (NetBootFileXferSize < (offset+len))
  96                NetBootFileXferSize = newsize;
  97        return 0;
  98}
  99
 100static char*
 101basename (char *path)
 102{
 103        char *fname;
 104
 105        fname = path + strlen(path) - 1;
 106        while (fname >= path) {
 107                if (*fname == '/') {
 108                        fname++;
 109                        break;
 110                }
 111                fname--;
 112        }
 113        return fname;
 114}
 115
 116static char*
 117dirname (char *path)
 118{
 119        char *fname;
 120
 121        fname = basename (path);
 122        --fname;
 123        *fname = '\0';
 124        return path;
 125}
 126
 127/**************************************************************************
 128RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 129**************************************************************************/
 130static long *rpc_add_credentials (long *p)
 131{
 132        int hl;
 133        int hostnamelen;
 134        char hostname[256];
 135
 136        strcpy (hostname, "");
 137        hostnamelen=strlen (hostname);
 138
 139        /* Here's the executive summary on authentication requirements of the
 140         * various NFS server implementations:  Linux accepts both AUTH_NONE
 141         * and AUTH_UNIX authentication (also accepts an empty hostname field
 142         * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 143         * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 144         * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 145         * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 146         * hostname).  */
 147
 148        hl = (hostnamelen + 3) & ~3;
 149
 150        /* Provide an AUTH_UNIX credential.  */
 151        *p++ = htonl(1);                /* AUTH_UNIX */
 152        *p++ = htonl(hl+20);            /* auth length */
 153        *p++ = htonl(0);                /* stamp */
 154        *p++ = htonl(hostnamelen);      /* hostname string */
 155        if (hostnamelen & 3) {
 156                *(p + hostnamelen / 4) = 0; /* add zero padding */
 157        }
 158        memcpy (p, hostname, hostnamelen);
 159        p += hl / 4;
 160        *p++ = 0;                       /* uid */
 161        *p++ = 0;                       /* gid */
 162        *p++ = 0;                       /* auxiliary gid list */
 163
 164        /* Provide an AUTH_NONE verifier.  */
 165        *p++ = 0;                       /* AUTH_NONE */
 166        *p++ = 0;                       /* auth length */
 167
 168        return p;
 169}
 170
 171/**************************************************************************
 172RPC_LOOKUP - Lookup RPC Port numbers
 173**************************************************************************/
 174static void
 175rpc_req (int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 176{
 177        struct rpc_t pkt;
 178        unsigned long id;
 179        uint32_t *p;
 180        int pktlen;
 181        int sport;
 182
 183        id = ++rpc_id;
 184        pkt.u.call.id = htonl(id);
 185        pkt.u.call.type = htonl(MSG_CALL);
 186        pkt.u.call.rpcvers = htonl(2);  /* use RPC version 2 */
 187        pkt.u.call.prog = htonl(rpc_prog);
 188        pkt.u.call.vers = htonl(2);     /* portmapper is version 2 */
 189        pkt.u.call.proc = htonl(rpc_proc);
 190        p = (uint32_t *)&(pkt.u.call.data);
 191
 192        if (datalen)
 193                memcpy ((char *)p, (char *)data, datalen*sizeof(uint32_t));
 194
 195        pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
 196
 197        memcpy ((char *)NetTxPacket + NetEthHdrSize() + IP_HDR_SIZE, (char *)&pkt, pktlen);
 198
 199        if (rpc_prog == PROG_PORTMAP)
 200                sport = SUNRPC_PORT;
 201        else if (rpc_prog == PROG_MOUNT)
 202                sport = NfsSrvMountPort;
 203        else
 204                sport = NfsSrvNfsPort;
 205
 206        NetSendUDPPacket (NetServerEther, NfsServerIP, sport, NfsOurPort, pktlen);
 207}
 208
 209/**************************************************************************
 210RPC_LOOKUP - Lookup RPC Port numbers
 211**************************************************************************/
 212static void
 213rpc_lookup_req (int prog, int ver)
 214{
 215        uint32_t data[16];
 216
 217        data[0] = 0; data[1] = 0;       /* auth credential */
 218        data[2] = 0; data[3] = 0;       /* auth verifier */
 219        data[4] = htonl(prog);
 220        data[5] = htonl(ver);
 221        data[6] = htonl(17);    /* IP_UDP */
 222        data[7] = 0;
 223
 224        rpc_req (PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 225}
 226
 227/**************************************************************************
 228NFS_MOUNT - Mount an NFS Filesystem
 229**************************************************************************/
 230static void
 231nfs_mount_req (char *path)
 232{
 233        uint32_t data[1024];
 234        uint32_t *p;
 235        int len;
 236        int pathlen;
 237
 238        pathlen = strlen (path);
 239
 240        p = &(data[0]);
 241        p = (uint32_t *)rpc_add_credentials((long *)p);
 242
 243        *p++ = htonl(pathlen);
 244        if (pathlen & 3) *(p + pathlen / 4) = 0;
 245        memcpy (p, path, pathlen);
 246        p += (pathlen + 3) / 4;
 247
 248        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 249
 250        rpc_req (PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 251}
 252
 253/**************************************************************************
 254NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 255**************************************************************************/
 256static void
 257nfs_umountall_req (void)
 258{
 259        uint32_t data[1024];
 260        uint32_t *p;
 261        int len;
 262
 263        if ((NfsSrvMountPort == -1) || (!fs_mounted)) {
 264                /* Nothing mounted, nothing to umount */
 265                return;
 266        }
 267
 268        p = &(data[0]);
 269        p = (uint32_t *)rpc_add_credentials ((long *)p);
 270
 271        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 272
 273        rpc_req (PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 274}
 275
 276/***************************************************************************
 277 * NFS_READLINK (AH 2003-07-14)
 278 * This procedure is called when read of the first block fails -
 279 * this probably happens when it's a directory or a symlink
 280 * In case of successful readlink(), the dirname is manipulated,
 281 * so that inside the nfs() function a recursion can be done.
 282 **************************************************************************/
 283static void
 284nfs_readlink_req (void)
 285{
 286        uint32_t data[1024];
 287        uint32_t *p;
 288        int len;
 289
 290        p = &(data[0]);
 291        p = (uint32_t *)rpc_add_credentials ((long *)p);
 292
 293        memcpy (p, filefh, NFS_FHSIZE);
 294        p += (NFS_FHSIZE / 4);
 295
 296        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 297
 298        rpc_req (PROG_NFS, NFS_READLINK, data, len);
 299}
 300
 301/**************************************************************************
 302NFS_LOOKUP - Lookup Pathname
 303**************************************************************************/
 304static void
 305nfs_lookup_req (char *fname)
 306{
 307        uint32_t data[1024];
 308        uint32_t *p;
 309        int len;
 310        int fnamelen;
 311
 312        fnamelen = strlen (fname);
 313
 314        p = &(data[0]);
 315        p = (uint32_t *)rpc_add_credentials ((long *)p);
 316
 317        memcpy (p, dirfh, NFS_FHSIZE);
 318        p += (NFS_FHSIZE / 4);
 319        *p++ = htonl(fnamelen);
 320        if (fnamelen & 3) *(p + fnamelen / 4) = 0;
 321        memcpy (p, fname, fnamelen);
 322        p += (fnamelen + 3) / 4;
 323
 324        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 325
 326        rpc_req (PROG_NFS, NFS_LOOKUP, data, len);
 327}
 328
 329/**************************************************************************
 330NFS_READ - Read File on NFS Server
 331**************************************************************************/
 332static void
 333nfs_read_req (int offset, int readlen)
 334{
 335        uint32_t data[1024];
 336        uint32_t *p;
 337        int len;
 338
 339        p = &(data[0]);
 340        p = (uint32_t *)rpc_add_credentials ((long *)p);
 341
 342        memcpy (p, filefh, NFS_FHSIZE);
 343        p += (NFS_FHSIZE / 4);
 344        *p++ = htonl(offset);
 345        *p++ = htonl(readlen);
 346        *p++ = 0;
 347
 348        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 349
 350        rpc_req (PROG_NFS, NFS_READ, data, len);
 351}
 352
 353/**************************************************************************
 354RPC request dispatcher
 355**************************************************************************/
 356
 357static void
 358NfsSend (void)
 359{
 360#ifdef NFS_DEBUG
 361        printf ("%s\n", __FUNCTION__);
 362#endif
 363
 364        switch (NfsState) {
 365        case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 366                rpc_lookup_req (PROG_MOUNT, 1);
 367                break;
 368        case STATE_PRCLOOKUP_PROG_NFS_REQ:
 369                rpc_lookup_req (PROG_NFS, 2);
 370                break;
 371        case STATE_MOUNT_REQ:
 372                nfs_mount_req (nfs_path);
 373                break;
 374        case STATE_UMOUNT_REQ:
 375                nfs_umountall_req ();
 376                break;
 377        case STATE_LOOKUP_REQ:
 378                nfs_lookup_req (nfs_filename);
 379                break;
 380        case STATE_READ_REQ:
 381                nfs_read_req (nfs_offset, nfs_len);
 382                break;
 383        case STATE_READLINK_REQ:
 384                nfs_readlink_req ();
 385                break;
 386        }
 387}
 388
 389/**************************************************************************
 390Handlers for the reply from server
 391**************************************************************************/
 392
 393static int
 394rpc_lookup_reply (int prog, uchar *pkt, unsigned len)
 395{
 396        struct rpc_t rpc_pkt;
 397
 398        memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 399
 400#ifdef NFS_DEBUG
 401        printf ("%s\n", __FUNCTION__);
 402#endif
 403
 404        if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 405                return -1;
 406
 407        if (rpc_pkt.u.reply.rstatus  ||
 408            rpc_pkt.u.reply.verifier ||
 409            rpc_pkt.u.reply.astatus) {
 410                return -1;
 411        }
 412
 413        switch (prog) {
 414        case PROG_MOUNT:
 415                NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]);
 416                break;
 417        case PROG_NFS:
 418                NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]);
 419                break;
 420        }
 421
 422        return 0;
 423}
 424
 425static int
 426nfs_mount_reply (uchar *pkt, unsigned len)
 427{
 428        struct rpc_t rpc_pkt;
 429
 430#ifdef NFS_DEBUG
 431        printf ("%s\n", __FUNCTION__);
 432#endif
 433
 434        memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 435
 436        if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 437                return -1;
 438
 439        if (rpc_pkt.u.reply.rstatus  ||
 440            rpc_pkt.u.reply.verifier ||
 441            rpc_pkt.u.reply.astatus  ||
 442            rpc_pkt.u.reply.data[0]) {
 443                return -1;
 444        }
 445
 446        fs_mounted = 1;
 447        memcpy (dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 448
 449        return 0;
 450}
 451
 452static int
 453nfs_umountall_reply (uchar *pkt, unsigned len)
 454{
 455        struct rpc_t rpc_pkt;
 456
 457#ifdef NFS_DEBUG
 458        printf ("%s\n", __FUNCTION__);
 459#endif
 460
 461        memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 462
 463        if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 464                return -1;
 465
 466        if (rpc_pkt.u.reply.rstatus  ||
 467            rpc_pkt.u.reply.verifier ||
 468            rpc_pkt.u.reply.astatus) {
 469                return -1;
 470        }
 471
 472        fs_mounted = 0;
 473        memset (dirfh, 0, sizeof(dirfh));
 474
 475        return 0;
 476}
 477
 478static int
 479nfs_lookup_reply (uchar *pkt, unsigned len)
 480{
 481        struct rpc_t rpc_pkt;
 482
 483#ifdef NFS_DEBUG
 484        printf ("%s\n", __FUNCTION__);
 485#endif
 486
 487        memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 488
 489        if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 490                return -1;
 491
 492        if (rpc_pkt.u.reply.rstatus  ||
 493            rpc_pkt.u.reply.verifier ||
 494            rpc_pkt.u.reply.astatus  ||
 495            rpc_pkt.u.reply.data[0]) {
 496                return -1;
 497        }
 498
 499        memcpy (filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 500
 501        return 0;
 502}
 503
 504static int
 505nfs_readlink_reply (uchar *pkt, unsigned len)
 506{
 507        struct rpc_t rpc_pkt;
 508        int rlen;
 509
 510#ifdef NFS_DEBUG
 511        printf ("%s\n", __FUNCTION__);
 512#endif
 513
 514        memcpy ((unsigned char *)&rpc_pkt, pkt, len);
 515
 516        if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 517                return -1;
 518
 519        if (rpc_pkt.u.reply.rstatus  ||
 520            rpc_pkt.u.reply.verifier ||
 521            rpc_pkt.u.reply.astatus  ||
 522            rpc_pkt.u.reply.data[0]) {
 523                return -1;
 524        }
 525
 526        rlen = ntohl (rpc_pkt.u.reply.data[1]); /* new path length */
 527
 528        if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
 529                int pathlen;
 530                strcat (nfs_path, "/");
 531                pathlen = strlen(nfs_path);
 532                memcpy (nfs_path+pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 533                nfs_path[pathlen+rlen+1] = 0;
 534        } else {
 535                memcpy (nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 536                nfs_path[rlen] = 0;
 537        }
 538        return 0;
 539}
 540
 541static int
 542nfs_read_reply (uchar *pkt, unsigned len)
 543{
 544        struct rpc_t rpc_pkt;
 545        int rlen;
 546
 547#ifdef NFS_DEBUG_nop
 548        printf ("%s\n", __FUNCTION__);
 549#endif
 550
 551        memcpy ((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
 552
 553        if (ntohl(rpc_pkt.u.reply.id) != rpc_id)
 554                return -1;
 555
 556        if (rpc_pkt.u.reply.rstatus  ||
 557            rpc_pkt.u.reply.verifier ||
 558            rpc_pkt.u.reply.astatus  ||
 559            rpc_pkt.u.reply.data[0]) {
 560                if (rpc_pkt.u.reply.rstatus) {
 561                        return -9999;
 562                }
 563                if (rpc_pkt.u.reply.astatus) {
 564                        return -9999;
 565                }
 566                return -ntohl(rpc_pkt.u.reply.data[0]);;
 567        }
 568
 569        if ((nfs_offset!=0) && !((nfs_offset) % (NFS_READ_SIZE/2*10*HASHES_PER_LINE))) {
 570                puts ("\n\t ");
 571        }
 572        if (!(nfs_offset % ((NFS_READ_SIZE/2)*10))) {
 573                putc ('#');
 574        }
 575
 576        rlen = ntohl(rpc_pkt.u.reply.data[18]);
 577        if ( store_block ((uchar *)pkt+sizeof(rpc_pkt.u.reply), nfs_offset, rlen) )
 578                return -9999;
 579
 580        return rlen;
 581}
 582
 583/**************************************************************************
 584Interfaces of U-BOOT
 585**************************************************************************/
 586
 587static void
 588NfsTimeout (void)
 589{
 590        if ( NfsTimeoutCount++ < NFS_RETRY_COUNT ) {
 591                NfsSend ();
 592                return;
 593        }
 594        puts ("Timeout\n");
 595        NetState = NETLOOP_FAIL;
 596        return;
 597}
 598
 599static void
 600NfsHandler (uchar *pkt, unsigned dest, unsigned src, unsigned len)
 601{
 602        int rlen;
 603
 604#ifdef NFS_DEBUG
 605        printf ("%s\n", __FUNCTION__);
 606#endif
 607
 608        if (dest != NfsOurPort) return;
 609
 610        switch (NfsState) {
 611        case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 612                rpc_lookup_reply (PROG_MOUNT, pkt, len);
 613                NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ;
 614                NfsSend ();
 615                break;
 616
 617        case STATE_PRCLOOKUP_PROG_NFS_REQ:
 618                rpc_lookup_reply (PROG_NFS, pkt, len);
 619                NfsState = STATE_MOUNT_REQ;
 620                NfsSend ();
 621                break;
 622
 623        case STATE_MOUNT_REQ:
 624                if (nfs_mount_reply(pkt, len)) {
 625                        puts ("*** ERROR: Cannot mount\n");
 626                        /* just to be sure... */
 627                        NfsState = STATE_UMOUNT_REQ;
 628                        NfsSend ();
 629                } else {
 630                        NfsState = STATE_LOOKUP_REQ;
 631                        NfsSend ();
 632                }
 633                break;
 634
 635        case STATE_UMOUNT_REQ:
 636                if (nfs_umountall_reply(pkt, len)) {
 637                        puts ("*** ERROR: Cannot umount\n");
 638                        NetState = NETLOOP_FAIL;
 639                } else {
 640                        puts ("\ndone\n");
 641                        NetState = NfsDownloadState;
 642                }
 643                break;
 644
 645        case STATE_LOOKUP_REQ:
 646                if (nfs_lookup_reply(pkt, len)) {
 647                        puts ("*** ERROR: File lookup fail\n");
 648                        NfsState = STATE_UMOUNT_REQ;
 649                        NfsSend ();
 650                } else {
 651                        NfsState = STATE_READ_REQ;
 652                        nfs_offset = 0;
 653                        nfs_len = NFS_READ_SIZE;
 654                        NfsSend ();
 655                }
 656                break;
 657
 658        case STATE_READLINK_REQ:
 659                if (nfs_readlink_reply(pkt, len)) {
 660                        puts ("*** ERROR: Symlink fail\n");
 661                        NfsState = STATE_UMOUNT_REQ;
 662                        NfsSend ();
 663                } else {
 664#ifdef NFS_DEBUG
 665                        printf ("Symlink --> %s\n", nfs_path);
 666#endif
 667                        nfs_filename = basename (nfs_path);
 668                        nfs_path     = dirname (nfs_path);
 669
 670                        NfsState = STATE_MOUNT_REQ;
 671                        NfsSend ();
 672                }
 673                break;
 674
 675        case STATE_READ_REQ:
 676                rlen = nfs_read_reply (pkt, len);
 677                NetSetTimeout (NFS_TIMEOUT, NfsTimeout);
 678                if (rlen > 0) {
 679                        nfs_offset += rlen;
 680                        NfsSend ();
 681                }
 682                else if ((rlen == -NFSERR_ISDIR)||(rlen == -NFSERR_INVAL)) {
 683                        /* symbolic link */
 684                        NfsState = STATE_READLINK_REQ;
 685                        NfsSend ();
 686                } else {
 687                        if ( ! rlen ) NfsDownloadState = NETLOOP_SUCCESS;
 688                        NfsState = STATE_UMOUNT_REQ;
 689                        NfsSend ();
 690                }
 691                break;
 692        }
 693}
 694
 695
 696void
 697NfsStart (void)
 698{
 699#ifdef NFS_DEBUG
 700        printf ("%s\n", __FUNCTION__);
 701#endif
 702        NfsDownloadState = NETLOOP_FAIL;
 703
 704        NfsServerIP = NetServerIP;
 705        nfs_path = (char *)nfs_path_buff;
 706
 707        if (nfs_path == NULL) {
 708                NetState = NETLOOP_FAIL;
 709                puts ("*** ERROR: Fail allocate memory\n");
 710                return;
 711        }
 712
 713        if (BootFile[0] == '\0') {
 714                sprintf (default_filename, "/nfsroot/%02lX%02lX%02lX%02lX.img",
 715                        NetOurIP & 0xFF,
 716                        (NetOurIP >>  8) & 0xFF,
 717                        (NetOurIP >> 16) & 0xFF,
 718                        (NetOurIP >> 24) & 0xFF );
 719                strcpy (nfs_path, default_filename);
 720
 721                printf ("*** Warning: no boot file name; using '%s'\n",
 722                        nfs_path);
 723        } else {
 724                char *p=BootFile;
 725
 726                p = strchr (p, ':');
 727
 728                if (p != NULL) {
 729                        NfsServerIP = string_to_ip (BootFile);
 730                        ++p;
 731                        strcpy (nfs_path, p);
 732                } else {
 733                        strcpy (nfs_path, BootFile);
 734                }
 735        }
 736
 737        nfs_filename = basename (nfs_path);
 738        nfs_path     = dirname (nfs_path);
 739
 740#if defined(CONFIG_NET_MULTI)
 741        printf ("Using %s device\n", eth_get_name());
 742#endif
 743
 744        puts ("File transfer via NFS from server "); print_IPaddr (NfsServerIP);
 745        puts ("; our IP address is ");              print_IPaddr (NetOurIP);
 746
 747        /* Check if we need to send across this subnet */
 748        if (NetOurGatewayIP && NetOurSubnetMask) {
 749                IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
 750                IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
 751
 752                if (OurNet != ServerNet) {
 753                        puts ("; sending through gateway ");
 754                        print_IPaddr (NetOurGatewayIP) ;
 755                }
 756        }
 757        printf ("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 758
 759        if (NetBootFileSize) {
 760                printf (" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 761                print_size (NetBootFileSize<<9, "");
 762        }
 763        printf ("\nLoad address: 0x%lx\n"
 764                "Loading: *\b", load_addr);
 765
 766        NetSetTimeout (NFS_TIMEOUT, NfsTimeout);
 767        NetSetHandler (NfsHandler);
 768
 769        NfsTimeoutCount = 0;
 770        NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 771
 772        /*NfsOurPort = 4096 + (get_ticks() % 3072);*/
 773        /*FIX ME !!!*/
 774        NfsOurPort = 1000;
 775
 776        /* zero out server ether in case the server ip has changed */
 777        memset (NetServerEther, 0, 6);
 778
 779        NfsSend ();
 780}
 781
 782#endif
 783