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 <mapmem.h>
  30#include "nfs.h"
  31#include "bootp.h"
  32
  33#define HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  34#define NFS_RETRY_COUNT 30
  35#ifndef CONFIG_NFS_TIMEOUT
  36# define NFS_TIMEOUT 2000UL
  37#else
  38# define NFS_TIMEOUT CONFIG_NFS_TIMEOUT
  39#endif
  40
  41#define NFS_RPC_ERR     1
  42#define NFS_RPC_DROP    124
  43
  44static int fs_mounted;
  45static unsigned long rpc_id;
  46static int nfs_offset = -1;
  47static int nfs_len;
  48static ulong nfs_timeout = NFS_TIMEOUT;
  49
  50static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  51static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  52
  53static enum net_loop_state nfs_download_state;
  54static struct in_addr nfs_server_ip;
  55static int nfs_server_mount_port;
  56static int nfs_server_port;
  57static int nfs_our_port;
  58static int nfs_timeout_count;
  59static int nfs_state;
  60#define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  61#define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  62#define STATE_MOUNT_REQ                 3
  63#define STATE_UMOUNT_REQ                4
  64#define STATE_LOOKUP_REQ                5
  65#define STATE_READ_REQ                  6
  66#define STATE_READLINK_REQ              7
  67
  68static char default_filename[64];
  69static char *nfs_filename;
  70static char *nfs_path;
  71static char nfs_path_buff[2048];
  72
  73static inline int store_block(uchar *src, unsigned offset, unsigned len)
  74{
  75        ulong newsize = offset + len;
  76#ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  77        int i, rc = 0;
  78
  79        for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  80                /* start address in flash? */
  81                if (load_addr + offset >= flash_info[i].start[0]) {
  82                        rc = 1;
  83                        break;
  84                }
  85        }
  86
  87        if (rc) { /* Flash is destination for this packet */
  88                rc = flash_write((uchar *)src, (ulong)(load_addr+offset), len);
  89                if (rc) {
  90                        flash_perror(rc);
  91                        return -1;
  92                }
  93        } else
  94#endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
  95        {
  96                void *ptr = map_sysmem(load_addr + offset, len);
  97
  98                memcpy(ptr, src, len);
  99                unmap_sysmem(ptr);
 100        }
 101
 102        if (net_boot_file_size < (offset + len))
 103                net_boot_file_size = newsize;
 104        return 0;
 105}
 106
 107static char *basename(char *path)
 108{
 109        char *fname;
 110
 111        fname = path + strlen(path) - 1;
 112        while (fname >= path) {
 113                if (*fname == '/') {
 114                        fname++;
 115                        break;
 116                }
 117                fname--;
 118        }
 119        return fname;
 120}
 121
 122static char *dirname(char *path)
 123{
 124        char *fname;
 125
 126        fname = basename(path);
 127        --fname;
 128        *fname = '\0';
 129        return path;
 130}
 131
 132/**************************************************************************
 133RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 134**************************************************************************/
 135static long *rpc_add_credentials(long *p)
 136{
 137        int hl;
 138        int hostnamelen;
 139        char hostname[256];
 140
 141        strcpy(hostname, "");
 142        hostnamelen = strlen(hostname);
 143
 144        /* Here's the executive summary on authentication requirements of the
 145         * various NFS server implementations:  Linux accepts both AUTH_NONE
 146         * and AUTH_UNIX authentication (also accepts an empty hostname field
 147         * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 148         * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 149         * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 150         * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 151         * hostname).  */
 152
 153        hl = (hostnamelen + 3) & ~3;
 154
 155        /* Provide an AUTH_UNIX credential.  */
 156        *p++ = htonl(1);                /* AUTH_UNIX */
 157        *p++ = htonl(hl+20);            /* auth length */
 158        *p++ = htonl(0);                /* stamp */
 159        *p++ = htonl(hostnamelen);      /* hostname string */
 160        if (hostnamelen & 3)
 161                *(p + hostnamelen / 4) = 0; /* add zero padding */
 162        memcpy(p, hostname, hostnamelen);
 163        p += hl / 4;
 164        *p++ = 0;                       /* uid */
 165        *p++ = 0;                       /* gid */
 166        *p++ = 0;                       /* auxiliary gid list */
 167
 168        /* Provide an AUTH_NONE verifier.  */
 169        *p++ = 0;                       /* AUTH_NONE */
 170        *p++ = 0;                       /* auth length */
 171
 172        return p;
 173}
 174
 175/**************************************************************************
 176RPC_LOOKUP - Lookup RPC Port numbers
 177**************************************************************************/
 178static void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 179{
 180        struct rpc_t pkt;
 181        unsigned long id;
 182        uint32_t *p;
 183        int pktlen;
 184        int sport;
 185
 186        id = ++rpc_id;
 187        pkt.u.call.id = htonl(id);
 188        pkt.u.call.type = htonl(MSG_CALL);
 189        pkt.u.call.rpcvers = htonl(2);  /* use RPC version 2 */
 190        pkt.u.call.prog = htonl(rpc_prog);
 191        pkt.u.call.vers = htonl(2);     /* portmapper is version 2 */
 192        pkt.u.call.proc = htonl(rpc_proc);
 193        p = (uint32_t *)&(pkt.u.call.data);
 194
 195        if (datalen)
 196                memcpy((char *)p, (char *)data, datalen*sizeof(uint32_t));
 197
 198        pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
 199
 200        memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
 201               (char *)&pkt, pktlen);
 202
 203        if (rpc_prog == PROG_PORTMAP)
 204                sport = SUNRPC_PORT;
 205        else if (rpc_prog == PROG_MOUNT)
 206                sport = nfs_server_mount_port;
 207        else
 208                sport = nfs_server_port;
 209
 210        net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
 211                            nfs_our_port, pktlen);
 212}
 213
 214/**************************************************************************
 215RPC_LOOKUP - Lookup RPC Port numbers
 216**************************************************************************/
 217static void rpc_lookup_req(int prog, int ver)
 218{
 219        uint32_t data[16];
 220
 221        data[0] = 0; data[1] = 0;       /* auth credential */
 222        data[2] = 0; data[3] = 0;       /* auth verifier */
 223        data[4] = htonl(prog);
 224        data[5] = htonl(ver);
 225        data[6] = htonl(17);    /* IP_UDP */
 226        data[7] = 0;
 227
 228        rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 229}
 230
 231/**************************************************************************
 232NFS_MOUNT - Mount an NFS Filesystem
 233**************************************************************************/
 234static void nfs_mount_req(char *path)
 235{
 236        uint32_t data[1024];
 237        uint32_t *p;
 238        int len;
 239        int pathlen;
 240
 241        pathlen = strlen(path);
 242
 243        p = &(data[0]);
 244        p = (uint32_t *)rpc_add_credentials((long *)p);
 245
 246        *p++ = htonl(pathlen);
 247        if (pathlen & 3)
 248                *(p + pathlen / 4) = 0;
 249        memcpy(p, path, pathlen);
 250        p += (pathlen + 3) / 4;
 251
 252        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 253
 254        rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 255}
 256
 257/**************************************************************************
 258NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 259**************************************************************************/
 260static void nfs_umountall_req(void)
 261{
 262        uint32_t data[1024];
 263        uint32_t *p;
 264        int len;
 265
 266        if ((nfs_server_mount_port == -1) || (!fs_mounted))
 267                /* Nothing mounted, nothing to umount */
 268                return;
 269
 270        p = &(data[0]);
 271        p = (uint32_t *)rpc_add_credentials((long *)p);
 272
 273        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 274
 275        rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 276}
 277
 278/***************************************************************************
 279 * NFS_READLINK (AH 2003-07-14)
 280 * This procedure is called when read of the first block fails -
 281 * this probably happens when it's a directory or a symlink
 282 * In case of successful readlink(), the dirname is manipulated,
 283 * so that inside the nfs() function a recursion can be done.
 284 **************************************************************************/
 285static void nfs_readlink_req(void)
 286{
 287        uint32_t data[1024];
 288        uint32_t *p;
 289        int len;
 290
 291        p = &(data[0]);
 292        p = (uint32_t *)rpc_add_credentials((long *)p);
 293
 294        memcpy(p, filefh, NFS_FHSIZE);
 295        p += (NFS_FHSIZE / 4);
 296
 297        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 298
 299        rpc_req(PROG_NFS, NFS_READLINK, data, len);
 300}
 301
 302/**************************************************************************
 303NFS_LOOKUP - Lookup Pathname
 304**************************************************************************/
 305static void nfs_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)
 321                *(p + fnamelen / 4) = 0;
 322        memcpy(p, fname, fnamelen);
 323        p += (fnamelen + 3) / 4;
 324
 325        len = (uint32_t *)p - (uint32_t *)&(data[0]);
 326
 327        rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
 328}
 329
 330/**************************************************************************
 331NFS_READ - Read File on NFS Server
 332**************************************************************************/
 333static void nfs_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**************************************************************************/
 356static void nfs_send(void)
 357{
 358        debug("%s\n", __func__);
 359
 360        switch (nfs_state) {
 361        case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 362                rpc_lookup_req(PROG_MOUNT, 1);
 363                break;
 364        case STATE_PRCLOOKUP_PROG_NFS_REQ:
 365                rpc_lookup_req(PROG_NFS, 2);
 366                break;
 367        case STATE_MOUNT_REQ:
 368                nfs_mount_req(nfs_path);
 369                break;
 370        case STATE_UMOUNT_REQ:
 371                nfs_umountall_req();
 372                break;
 373        case STATE_LOOKUP_REQ:
 374                nfs_lookup_req(nfs_filename);
 375                break;
 376        case STATE_READ_REQ:
 377                nfs_read_req(nfs_offset, nfs_len);
 378                break;
 379        case STATE_READLINK_REQ:
 380                nfs_readlink_req();
 381                break;
 382        }
 383}
 384
 385/**************************************************************************
 386Handlers for the reply from server
 387**************************************************************************/
 388
 389static int rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
 390{
 391        struct rpc_t rpc_pkt;
 392
 393        memcpy((unsigned char *)&rpc_pkt, pkt, len);
 394
 395        debug("%s\n", __func__);
 396
 397        if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 398                return -NFS_RPC_ERR;
 399        else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 400                return -NFS_RPC_DROP;
 401
 402        if (rpc_pkt.u.reply.rstatus  ||
 403            rpc_pkt.u.reply.verifier ||
 404            rpc_pkt.u.reply.astatus)
 405                return -1;
 406
 407        switch (prog) {
 408        case PROG_MOUNT:
 409                nfs_server_mount_port = ntohl(rpc_pkt.u.reply.data[0]);
 410                break;
 411        case PROG_NFS:
 412                nfs_server_port = ntohl(rpc_pkt.u.reply.data[0]);
 413                break;
 414        }
 415
 416        return 0;
 417}
 418
 419static int nfs_mount_reply(uchar *pkt, unsigned len)
 420{
 421        struct rpc_t rpc_pkt;
 422
 423        debug("%s\n", __func__);
 424
 425        memcpy((unsigned char *)&rpc_pkt, pkt, len);
 426
 427        if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 428                return -NFS_RPC_ERR;
 429        else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 430                return -NFS_RPC_DROP;
 431
 432        if (rpc_pkt.u.reply.rstatus  ||
 433            rpc_pkt.u.reply.verifier ||
 434            rpc_pkt.u.reply.astatus  ||
 435            rpc_pkt.u.reply.data[0])
 436                return -1;
 437
 438        fs_mounted = 1;
 439        memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 440
 441        return 0;
 442}
 443
 444static int nfs_umountall_reply(uchar *pkt, unsigned len)
 445{
 446        struct rpc_t rpc_pkt;
 447
 448        debug("%s\n", __func__);
 449
 450        memcpy((unsigned char *)&rpc_pkt, pkt, len);
 451
 452        if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 453                return -NFS_RPC_ERR;
 454        else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 455                return -NFS_RPC_DROP;
 456
 457        if (rpc_pkt.u.reply.rstatus  ||
 458            rpc_pkt.u.reply.verifier ||
 459            rpc_pkt.u.reply.astatus)
 460                return -1;
 461
 462        fs_mounted = 0;
 463        memset(dirfh, 0, sizeof(dirfh));
 464
 465        return 0;
 466}
 467
 468static int nfs_lookup_reply(uchar *pkt, unsigned len)
 469{
 470        struct rpc_t rpc_pkt;
 471
 472        debug("%s\n", __func__);
 473
 474        memcpy((unsigned char *)&rpc_pkt, pkt, len);
 475
 476        if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 477                return -NFS_RPC_ERR;
 478        else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 479                return -NFS_RPC_DROP;
 480
 481        if (rpc_pkt.u.reply.rstatus  ||
 482            rpc_pkt.u.reply.verifier ||
 483            rpc_pkt.u.reply.astatus  ||
 484            rpc_pkt.u.reply.data[0])
 485                return -1;
 486
 487        memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 488
 489        return 0;
 490}
 491
 492static int nfs_readlink_reply(uchar *pkt, unsigned len)
 493{
 494        struct rpc_t rpc_pkt;
 495        int rlen;
 496
 497        debug("%s\n", __func__);
 498
 499        memcpy((unsigned char *)&rpc_pkt, pkt, len);
 500
 501        if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 502                return -NFS_RPC_ERR;
 503        else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 504                return -NFS_RPC_DROP;
 505
 506        if (rpc_pkt.u.reply.rstatus  ||
 507            rpc_pkt.u.reply.verifier ||
 508            rpc_pkt.u.reply.astatus  ||
 509            rpc_pkt.u.reply.data[0])
 510                return -1;
 511
 512        rlen = ntohl(rpc_pkt.u.reply.data[1]); /* new path length */
 513
 514        if (*((char *)&(rpc_pkt.u.reply.data[2])) != '/') {
 515                int pathlen;
 516                strcat(nfs_path, "/");
 517                pathlen = strlen(nfs_path);
 518                memcpy(nfs_path + pathlen, (uchar *)&(rpc_pkt.u.reply.data[2]),
 519                       rlen);
 520                nfs_path[pathlen + rlen] = 0;
 521        } else {
 522                memcpy(nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 523                nfs_path[rlen] = 0;
 524        }
 525        return 0;
 526}
 527
 528static int nfs_read_reply(uchar *pkt, unsigned len)
 529{
 530        struct rpc_t rpc_pkt;
 531        int rlen;
 532
 533        debug("%s\n", __func__);
 534
 535        memcpy((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
 536
 537        if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 538                return -NFS_RPC_ERR;
 539        else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 540                return -NFS_RPC_DROP;
 541
 542        if (rpc_pkt.u.reply.rstatus  ||
 543            rpc_pkt.u.reply.verifier ||
 544            rpc_pkt.u.reply.astatus  ||
 545            rpc_pkt.u.reply.data[0]) {
 546                if (rpc_pkt.u.reply.rstatus)
 547                        return -9999;
 548                if (rpc_pkt.u.reply.astatus)
 549                        return -9999;
 550                return -ntohl(rpc_pkt.u.reply.data[0]);
 551        }
 552
 553        if ((nfs_offset != 0) && !((nfs_offset) %
 554                        (NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
 555                puts("\n\t ");
 556        if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
 557                putc('#');
 558
 559        rlen = ntohl(rpc_pkt.u.reply.data[18]);
 560        if (store_block((uchar *)pkt + sizeof(rpc_pkt.u.reply),
 561                        nfs_offset, rlen))
 562                return -9999;
 563
 564        return rlen;
 565}
 566
 567/**************************************************************************
 568Interfaces of U-BOOT
 569**************************************************************************/
 570static void nfs_timeout_handler(void)
 571{
 572        if (++nfs_timeout_count > NFS_RETRY_COUNT) {
 573                puts("\nRetry count exceeded; starting again\n");
 574                net_start_again();
 575        } else {
 576                puts("T ");
 577                net_set_timeout_handler(nfs_timeout +
 578                                        NFS_TIMEOUT * nfs_timeout_count,
 579                                        nfs_timeout_handler);
 580                nfs_send();
 581        }
 582}
 583
 584static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 585                        unsigned src, unsigned len)
 586{
 587        int rlen;
 588        int reply;
 589
 590        debug("%s\n", __func__);
 591
 592        if (dest != nfs_our_port)
 593                return;
 594
 595        switch (nfs_state) {
 596        case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 597                if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
 598                        break;
 599                nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
 600                nfs_send();
 601                break;
 602
 603        case STATE_PRCLOOKUP_PROG_NFS_REQ:
 604                if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
 605                        break;
 606                nfs_state = STATE_MOUNT_REQ;
 607                nfs_send();
 608                break;
 609
 610        case STATE_MOUNT_REQ:
 611                reply = nfs_mount_reply(pkt, len);
 612                if (reply == -NFS_RPC_DROP) {
 613                        break;
 614                } else if (reply == -NFS_RPC_ERR) {
 615                        puts("*** ERROR: Cannot mount\n");
 616                        /* just to be sure... */
 617                        nfs_state = STATE_UMOUNT_REQ;
 618                        nfs_send();
 619                } else {
 620                        nfs_state = STATE_LOOKUP_REQ;
 621                        nfs_send();
 622                }
 623                break;
 624
 625        case STATE_UMOUNT_REQ:
 626                reply = nfs_umountall_reply(pkt, len);
 627                if (reply == -NFS_RPC_DROP) {
 628                        break;
 629                } else if (reply == -NFS_RPC_ERR) {
 630                        puts("*** ERROR: Cannot umount\n");
 631                        net_set_state(NETLOOP_FAIL);
 632                } else {
 633                        puts("\ndone\n");
 634                        net_set_state(nfs_download_state);
 635                }
 636                break;
 637
 638        case STATE_LOOKUP_REQ:
 639                reply = nfs_lookup_reply(pkt, len);
 640                if (reply == -NFS_RPC_DROP) {
 641                        break;
 642                } else if (reply == -NFS_RPC_ERR) {
 643                        puts("*** ERROR: File lookup fail\n");
 644                        nfs_state = STATE_UMOUNT_REQ;
 645                        nfs_send();
 646                } else {
 647                        nfs_state = STATE_READ_REQ;
 648                        nfs_offset = 0;
 649                        nfs_len = NFS_READ_SIZE;
 650                        nfs_send();
 651                }
 652                break;
 653
 654        case STATE_READLINK_REQ:
 655                reply = nfs_readlink_reply(pkt, len);
 656                if (reply == -NFS_RPC_DROP) {
 657                        break;
 658                } else if (reply == -NFS_RPC_ERR) {
 659                        puts("*** ERROR: Symlink fail\n");
 660                        nfs_state = STATE_UMOUNT_REQ;
 661                        nfs_send();
 662                } else {
 663                        debug("Symlink --> %s\n", nfs_path);
 664                        nfs_filename = basename(nfs_path);
 665                        nfs_path     = dirname(nfs_path);
 666
 667                        nfs_state = STATE_MOUNT_REQ;
 668                        nfs_send();
 669                }
 670                break;
 671
 672        case STATE_READ_REQ:
 673                rlen = nfs_read_reply(pkt, len);
 674                net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 675                if (rlen > 0) {
 676                        nfs_offset += rlen;
 677                        nfs_send();
 678                } else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
 679                        /* symbolic link */
 680                        nfs_state = STATE_READLINK_REQ;
 681                        nfs_send();
 682                } else {
 683                        if (!rlen)
 684                                nfs_download_state = NETLOOP_SUCCESS;
 685                        nfs_state = STATE_UMOUNT_REQ;
 686                        nfs_send();
 687                }
 688                break;
 689        }
 690}
 691
 692
 693void nfs_start(void)
 694{
 695        debug("%s\n", __func__);
 696        nfs_download_state = NETLOOP_FAIL;
 697
 698        nfs_server_ip = net_server_ip;
 699        nfs_path = (char *)nfs_path_buff;
 700
 701        if (nfs_path == NULL) {
 702                net_set_state(NETLOOP_FAIL);
 703                puts("*** ERROR: Fail allocate memory\n");
 704                return;
 705        }
 706
 707        if (net_boot_file_name[0] == '\0') {
 708                sprintf(default_filename, "/nfsroot/%02X%02X%02X%02X.img",
 709                        net_ip.s_addr & 0xFF,
 710                        (net_ip.s_addr >>  8) & 0xFF,
 711                        (net_ip.s_addr >> 16) & 0xFF,
 712                        (net_ip.s_addr >> 24) & 0xFF);
 713                strcpy(nfs_path, default_filename);
 714
 715                printf("*** Warning: no boot file name; using '%s'\n",
 716                       nfs_path);
 717        } else {
 718                char *p = net_boot_file_name;
 719
 720                p = strchr(p, ':');
 721
 722                if (p != NULL) {
 723                        nfs_server_ip = string_to_ip(net_boot_file_name);
 724                        ++p;
 725                        strcpy(nfs_path, p);
 726                } else {
 727                        strcpy(nfs_path, net_boot_file_name);
 728                }
 729        }
 730
 731        nfs_filename = basename(nfs_path);
 732        nfs_path     = dirname(nfs_path);
 733
 734        printf("Using %s device\n", eth_get_name());
 735
 736        printf("File transfer via NFS from server %pI4; our IP address is %pI4",
 737               &nfs_server_ip, &net_ip);
 738
 739        /* Check if we need to send across this subnet */
 740        if (net_gateway.s_addr && net_netmask.s_addr) {
 741                struct in_addr our_net;
 742                struct in_addr server_net;
 743
 744                our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 745                server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
 746                if (our_net.s_addr != server_net.s_addr)
 747                        printf("; sending through gateway %pI4",
 748                               &net_gateway);
 749        }
 750        printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 751
 752        if (net_boot_file_expected_size_in_blocks) {
 753                printf(" Size is 0x%x Bytes = ",
 754                       net_boot_file_expected_size_in_blocks << 9);
 755                print_size(net_boot_file_expected_size_in_blocks << 9, "");
 756        }
 757        printf("\nLoad address: 0x%lx\n"
 758                "Loading: *\b", load_addr);
 759
 760        net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 761        net_set_udp_handler(nfs_handler);
 762
 763        nfs_timeout_count = 0;
 764        nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 765
 766        /*nfs_our_port = 4096 + (get_ticks() % 3072);*/
 767        /*FIX ME !!!*/
 768        nfs_our_port = 1000;
 769
 770        /* zero out server ether in case the server ip has changed */
 771        memset(net_server_ethaddr, 0, 6);
 772
 773        nfs_send();
 774}
 775