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 #ifndef CONFIG_NFS_TIMEOUT
  35 # define NFS_TIMEOUT 2000UL
  36 #else
  37 # define NFS_TIMEOUT CONFIG_NFS_TIMEOUT
  38 #endif
  39
  40 #define NFS_RPC_ERR     1
  41 #define NFS_RPC_DROP    124
  42
  43 static int fs_mounted;
  44 static unsigned long rpc_id;
  45 static int nfs_offset = -1;
  46 static int nfs_len;
  47 static ulong nfs_timeout = NFS_TIMEOUT;
  48
  49 static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  50 static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  51
  52 static enum net_loop_state nfs_download_state;
  53 static IPaddr_t NfsServerIP;
  54 static int      NfsSrvMountPort;
  55 static int      NfsSrvNfsPort;
  56 static int      NfsOurPort;
  57 static int      NfsTimeoutCount;
  58 static int      NfsState;
  59 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  60 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  61 #define STATE_MOUNT_REQ                 3
  62 #define STATE_UMOUNT_REQ                4
  63 #define STATE_LOOKUP_REQ                5
  64 #define STATE_READ_REQ                  6
  65 #define STATE_READLINK_REQ              7
  66
  67 static char default_filename[64];
  68 static char *nfs_filename;
  69 static char *nfs_path;
  70 static char nfs_path_buff[2048];
  71
  72 static inline int
  73 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)memcpy((void *)(load_addr + offset), src, len);
  97         }
  98
  99         if (NetBootFileXferSize < (offset+len))
 100                 NetBootFileXferSize = newsize;
 101         return 0;
 102 }
 103
 104 static char*
 105 basename(char *path)
 106 {
 107         char *fname;
 108
 109         fname = path + strlen(path) - 1;
 110         while (fname >= path) {
 111                 if (*fname == '/') {
 112                         fname++;
 113                         break;
 114                 }
 115                 fname--;
 116         }
 117         return fname;
 118 }
 119
 120 static char*
 121 dirname(char *path)
 122 {
 123         char *fname;
 124
 125         fname = basename(path);
 126         --fname;
 127         *fname = '\0';
 128         return path;
 129 }
 130
 131 /**************************************************************************
 132 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 133 **************************************************************************/
 134 static long *rpc_add_credentials(long *p)
 135 {
 136         int hl;
 137         int hostnamelen;
 138         char hostname[256];
 139
 140         strcpy(hostname, "");
 141         hostnamelen = strlen(hostname);
 142
 143         /* Here's the executive summary on authentication requirements of the
 144          * various NFS server implementations:  Linux accepts both AUTH_NONE
 145          * and AUTH_UNIX authentication (also accepts an empty hostname field
 146          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 147          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 148          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 149          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 150          * hostname).  */
 151
 152         hl = (hostnamelen + 3) & ~3;
 153
 154         /* Provide an AUTH_UNIX credential.  */
 155         *p++ = htonl(1);                /* AUTH_UNIX */
 156         *p++ = htonl(hl+20);            /* auth length */
 157         *p++ = htonl(0);                /* stamp */
 158         *p++ = htonl(hostnamelen);      /* hostname string */
 159         if (hostnamelen & 3)
 160                 *(p + hostnamelen / 4) = 0; /* add zero padding */
 161         memcpy(p, hostname, hostnamelen);
 162         p += hl / 4;
 163         *p++ = 0;                       /* uid */
 164         *p++ = 0;                       /* gid */
 165         *p++ = 0;                       /* auxiliary gid list */
 166
 167         /* Provide an AUTH_NONE verifier.  */
 168         *p++ = 0;                       /* AUTH_NONE */
 169         *p++ = 0;                       /* auth length */
 170
 171         return p;
 172 }
 173
 174 /**************************************************************************
 175 RPC_LOOKUP - Lookup RPC Port numbers
 176 **************************************************************************/
 177 static void
 178 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 *)NetTxPacket + NetEthHdrSize() + 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 = NfsSrvMountPort;
 207         else
 208                 sport = NfsSrvNfsPort;
 209
 210         NetSendUDPPacket(NetServerEther, NfsServerIP, sport, NfsOurPort,
 211                 pktlen);
 212 }
 213
 214 /**************************************************************************
 215 RPC_LOOKUP - Lookup RPC Port numbers
 216 **************************************************************************/
 217 static void
 218 rpc_lookup_req(int prog, int ver)
 219 {
 220         uint32_t data[16];
 221
 222         data[0] = 0; data[1] = 0;       /* auth credential */
 223         data[2] = 0; data[3] = 0;       /* auth verifier */
 224         data[4] = htonl(prog);
 225         data[5] = htonl(ver);
 226         data[6] = htonl(17);    /* IP_UDP */
 227         data[7] = 0;
 228
 229         rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 230 }
 231
 232 /**************************************************************************
 233 NFS_MOUNT - Mount an NFS Filesystem
 234 **************************************************************************/
 235 static void
 236 nfs_mount_req(char *path)
 237 {
 238         uint32_t data[1024];
 239         uint32_t *p;
 240         int len;
 241         int pathlen;
 242
 243         pathlen = strlen(path);
 244
 245         p = &(data[0]);
 246         p = (uint32_t *)rpc_add_credentials((long *)p);
 247
 248         *p++ = htonl(pathlen);
 249         if (pathlen & 3)
 250                 *(p + pathlen / 4) = 0;
 251         memcpy(p, path, pathlen);
 252         p += (pathlen + 3) / 4;
 253
 254         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 255
 256         rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 257 }
 258
 259 /**************************************************************************
 260 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 261 **************************************************************************/
 262 static void
 263 nfs_umountall_req(void)
 264 {
 265         uint32_t data[1024];
 266         uint32_t *p;
 267         int len;
 268
 269         if ((NfsSrvMountPort == -1) || (!fs_mounted))
 270                 /* Nothing mounted, nothing to umount */
 271                 return;
 272
 273         p = &(data[0]);
 274         p = (uint32_t *)rpc_add_credentials((long *)p);
 275
 276         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 277
 278         rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 279 }
 280
 281 /***************************************************************************
 282  * NFS_READLINK (AH 2003-07-14)
 283  * This procedure is called when read of the first block fails -
 284  * this probably happens when it's a directory or a symlink
 285  * In case of successful readlink(), the dirname is manipulated,
 286  * so that inside the nfs() function a recursion can be done.
 287  **************************************************************************/
 288 static void
 289 nfs_readlink_req(void)
 290 {
 291         uint32_t data[1024];
 292         uint32_t *p;
 293         int len;
 294
 295         p = &(data[0]);
 296         p = (uint32_t *)rpc_add_credentials((long *)p);
 297
 298         memcpy(p, filefh, NFS_FHSIZE);
 299         p += (NFS_FHSIZE / 4);
 300
 301         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 302
 303         rpc_req(PROG_NFS, NFS_READLINK, data, len);
 304 }
 305
 306 /**************************************************************************
 307 NFS_LOOKUP - Lookup Pathname
 308 **************************************************************************/
 309 static void
 310 nfs_lookup_req(char *fname)
 311 {
 312         uint32_t data[1024];
 313         uint32_t *p;
 314         int len;
 315         int fnamelen;
 316
 317         fnamelen = strlen(fname);
 318
 319         p = &(data[0]);
 320         p = (uint32_t *)rpc_add_credentials((long *)p);
 321
 322         memcpy(p, dirfh, NFS_FHSIZE);
 323         p += (NFS_FHSIZE / 4);
 324         *p++ = htonl(fnamelen);
 325         if (fnamelen & 3)
 326                 *(p + fnamelen / 4) = 0;
 327         memcpy(p, fname, fnamelen);
 328         p += (fnamelen + 3) / 4;
 329
 330         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 331
 332         rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
 333 }
 334
 335 /**************************************************************************
 336 NFS_READ - Read File on NFS Server
 337 **************************************************************************/
 338 static void
 339 nfs_read_req(int offset, int readlen)
 340 {
 341         uint32_t data[1024];
 342         uint32_t *p;
 343         int len;
 344
 345         p = &(data[0]);
 346         p = (uint32_t *)rpc_add_credentials((long *)p);
 347
 348         memcpy(p, filefh, NFS_FHSIZE);
 349         p += (NFS_FHSIZE / 4);
 350         *p++ = htonl(offset);
 351         *p++ = htonl(readlen);
 352         *p++ = 0;
 353
 354         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 355
 356         rpc_req(PROG_NFS, NFS_READ, data, len);
 357 }
 358
 359 /**************************************************************************
 360 RPC request dispatcher
 361 **************************************************************************/
 362
 363 static void
 364 NfsSend(void)
 365 {
 366         debug("%s\n", __func__);
 367
 368         switch (NfsState) {
 369         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 370                 rpc_lookup_req(PROG_MOUNT, 1);
 371                 break;
 372         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 373                 rpc_lookup_req(PROG_NFS, 2);
 374                 break;
 375         case STATE_MOUNT_REQ:
 376                 nfs_mount_req(nfs_path);
 377                 break;
 378         case STATE_UMOUNT_REQ:
 379                 nfs_umountall_req();
 380                 break;
 381         case STATE_LOOKUP_REQ:
 382                 nfs_lookup_req(nfs_filename);
 383                 break;
 384         case STATE_READ_REQ:
 385                 nfs_read_req(nfs_offset, nfs_len);
 386                 break;
 387         case STATE_READLINK_REQ:
 388                 nfs_readlink_req();
 389                 break;
 390         }
 391 }
 392
 393 /**************************************************************************
 394 Handlers for the reply from server
 395 **************************************************************************/
 396
 397 static int
 398 rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
 399 {
 400         struct rpc_t rpc_pkt;
 401
 402         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 403
 404         debug("%s\n", __func__);
 405
 406         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 407                 return -NFS_RPC_ERR;
 408         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 409                 return -NFS_RPC_DROP;
 410
 411         if (rpc_pkt.u.reply.rstatus  ||
 412             rpc_pkt.u.reply.verifier ||
 413             rpc_pkt.u.reply.astatus)
 414                 return -1;
 415
 416         switch (prog) {
 417         case PROG_MOUNT:
 418                 NfsSrvMountPort = ntohl(rpc_pkt.u.reply.data[0]);
 419                 break;
 420         case PROG_NFS:
 421                 NfsSrvNfsPort = ntohl(rpc_pkt.u.reply.data[0]);
 422                 break;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int
 429 nfs_mount_reply(uchar *pkt, unsigned len)
 430 {
 431         struct rpc_t rpc_pkt;
 432
 433         debug("%s\n", __func__);
 434
 435         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 436
 437         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 438                 return -NFS_RPC_ERR;
 439         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 440                 return -NFS_RPC_DROP;
 441
 442         if (rpc_pkt.u.reply.rstatus  ||
 443             rpc_pkt.u.reply.verifier ||
 444             rpc_pkt.u.reply.astatus  ||
 445             rpc_pkt.u.reply.data[0])
 446                 return -1;
 447
 448         fs_mounted = 1;
 449         memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 450
 451         return 0;
 452 }
 453
 454 static int
 455 nfs_umountall_reply(uchar *pkt, unsigned len)
 456 {
 457         struct rpc_t rpc_pkt;
 458
 459         debug("%s\n", __func__);
 460
 461         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 462
 463         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 464                 return -NFS_RPC_ERR;
 465         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 466                 return -NFS_RPC_DROP;
 467
 468         if (rpc_pkt.u.reply.rstatus  ||
 469             rpc_pkt.u.reply.verifier ||
 470             rpc_pkt.u.reply.astatus)
 471                 return -1;
 472
 473         fs_mounted = 0;
 474         memset(dirfh, 0, sizeof(dirfh));
 475
 476         return 0;
 477 }
 478
 479 static int
 480 nfs_lookup_reply(uchar *pkt, unsigned len)
 481 {
 482         struct rpc_t rpc_pkt;
 483
 484         debug("%s\n", __func__);
 485
 486         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 487
 488         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 489                 return -NFS_RPC_ERR;
 490         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 491                 return -NFS_RPC_DROP;
 492
 493         if (rpc_pkt.u.reply.rstatus  ||
 494             rpc_pkt.u.reply.verifier ||
 495             rpc_pkt.u.reply.astatus  ||
 496             rpc_pkt.u.reply.data[0])
 497                 return -1;
 498
 499         memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 500
 501         return 0;
 502 }
 503
 504 static int
 505 nfs_readlink_reply(uchar *pkt, unsigned len)
 506 {
 507         struct rpc_t rpc_pkt;
 508         int rlen;
 509
 510         debug("%s\n", __func__);
 511
 512         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 513
 514         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 515                 return -NFS_RPC_ERR;
 516         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 517                 return -NFS_RPC_DROP;
 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         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]),
 532                         rlen);
 533                 nfs_path[pathlen + rlen] = 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
 541 static int
 542 nfs_read_reply(uchar *pkt, unsigned len)
 543 {
 544         struct rpc_t rpc_pkt;
 545         int rlen;
 546
 547         debug("%s\n", __func__);
 548
 549         memcpy((uchar *)&rpc_pkt, pkt, sizeof(rpc_pkt.u.reply));
 550
 551         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 552                 return -NFS_RPC_ERR;
 553         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 554                 return -NFS_RPC_DROP;
 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                 if (rpc_pkt.u.reply.astatus)
 563                         return -9999;
 564                 return -ntohl(rpc_pkt.u.reply.data[0]);
 565         }
 566
 567         if ((nfs_offset != 0) && !((nfs_offset) %
 568                         (NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
 569                 puts("\n\t ");
 570         if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
 571                 putc('#');
 572
 573         rlen = ntohl(rpc_pkt.u.reply.data[18]);
 574         if (store_block((uchar *)pkt + sizeof(rpc_pkt.u.reply),
 575                         nfs_offset, rlen))
 576                 return -9999;
 577
 578         return rlen;
 579 }
 580
 581 /**************************************************************************
 582 Interfaces of U-BOOT
 583 **************************************************************************/
 584
 585 static void
 586 NfsTimeout(void)
 587 {
 588         if (++NfsTimeoutCount > NFS_RETRY_COUNT) {
 589                 puts("\nRetry count exceeded; starting again\n");
 590                 NetStartAgain();
 591         } else {
 592                 puts("T ");
 593                 NetSetTimeout(nfs_timeout + NFS_TIMEOUT * NfsTimeoutCount,
 594                               NfsTimeout);
 595                 NfsSend();
 596         }
 597 }
 598
 599 static void
 600 NfsHandler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len)
 601 {
 602         int rlen;
 603         int reply;
 604
 605         debug("%s\n", __func__);
 606
 607         if (dest != NfsOurPort)
 608                 return;
 609
 610         switch (NfsState) {
 611         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 612                 if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
 613                         break;
 614                 NfsState = STATE_PRCLOOKUP_PROG_NFS_REQ;
 615                 NfsSend();
 616                 break;
 617
 618         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 619                 if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
 620                         break;
 621                 NfsState = STATE_MOUNT_REQ;
 622                 NfsSend();
 623                 break;
 624
 625         case STATE_MOUNT_REQ:
 626                 reply = nfs_mount_reply(pkt, len);
 627                 if (reply == -NFS_RPC_DROP)
 628                         break;
 629                 else if (reply == -NFS_RPC_ERR) {
 630                         puts("*** ERROR: Cannot mount\n");
 631                         /* just to be sure... */
 632                         NfsState = STATE_UMOUNT_REQ;
 633                         NfsSend();
 634                 } else {
 635                         NfsState = STATE_LOOKUP_REQ;
 636                         NfsSend();
 637                 }
 638                 break;
 639
 640         case STATE_UMOUNT_REQ:
 641                 reply = nfs_umountall_reply(pkt, len);
 642                 if (reply == -NFS_RPC_DROP)
 643                         break;
 644                 else if (reply == -NFS_RPC_ERR) {
 645                         puts("*** ERROR: Cannot umount\n");
 646                         net_set_state(NETLOOP_FAIL);
 647                 } else {
 648                         puts("\ndone\n");
 649                         net_set_state(nfs_download_state);
 650                 }
 651                 break;
 652
 653         case STATE_LOOKUP_REQ:
 654                 reply = nfs_lookup_reply(pkt, len);
 655                 if (reply == -NFS_RPC_DROP)
 656                         break;
 657                 else if (reply == -NFS_RPC_ERR) {
 658                         puts("*** ERROR: File lookup fail\n");
 659                         NfsState = STATE_UMOUNT_REQ;
 660                         NfsSend();
 661                 } else {
 662                         NfsState = STATE_READ_REQ;
 663                         nfs_offset = 0;
 664                         nfs_len = NFS_READ_SIZE;
 665                         NfsSend();
 666                 }
 667                 break;
 668
 669         case STATE_READLINK_REQ:
 670                 reply = nfs_readlink_reply(pkt, len);
 671                 if (reply == -NFS_RPC_DROP)
 672                         break;
 673                 else if (reply == -NFS_RPC_ERR) {
 674                         puts("*** ERROR: Symlink fail\n");
 675                         NfsState = STATE_UMOUNT_REQ;
 676                         NfsSend();
 677                 } else {
 678                         debug("Symlink --> %s\n", nfs_path);
 679                         nfs_filename = basename(nfs_path);
 680                         nfs_path     = dirname(nfs_path);
 681
 682                         NfsState = STATE_MOUNT_REQ;
 683                         NfsSend();
 684                 }
 685                 break;
 686
 687         case STATE_READ_REQ:
 688                 rlen = nfs_read_reply(pkt, len);
 689                 NetSetTimeout(nfs_timeout, NfsTimeout);
 690                 if (rlen > 0) {
 691                         nfs_offset += rlen;
 692                         NfsSend();
 693                 } else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
 694                         /* symbolic link */
 695                         NfsState = STATE_READLINK_REQ;
 696                         NfsSend();
 697                 } else {
 698                         if (!rlen)
 699                                 nfs_download_state = NETLOOP_SUCCESS;
 700                         NfsState = STATE_UMOUNT_REQ;
 701                         NfsSend();
 702                 }
 703                 break;
 704         }
 705 }
 706
 707
 708 void
 709 NfsStart(void)
 710 {
 711         debug("%s\n", __func__);
 712         nfs_download_state = NETLOOP_FAIL;
 713
 714         NfsServerIP = NetServerIP;
 715         nfs_path = (char *)nfs_path_buff;
 716
 717         if (nfs_path == NULL) {
 718                 net_set_state(NETLOOP_FAIL);
 719                 puts("*** ERROR: Fail allocate memory\n");
 720                 return;
 721         }
 722
 723         if (BootFile[0] == '\0') {
 724                 sprintf(default_filename, "/nfsroot/%02X%02X%02X%02X.img",
 725                         NetOurIP & 0xFF,
 726                         (NetOurIP >>  8) & 0xFF,
 727                         (NetOurIP >> 16) & 0xFF,
 728                         (NetOurIP >> 24) & 0xFF);
 729                 strcpy(nfs_path, default_filename);
 730
 731                 printf("*** Warning: no boot file name; using '%s'\n",
 732                         nfs_path);
 733         } else {
 734                 char *p = BootFile;
 735
 736                 p = strchr(p, ':');
 737
 738                 if (p != NULL) {
 739                         NfsServerIP = string_to_ip(BootFile);
 740                         ++p;
 741                         strcpy(nfs_path, p);
 742                 } else {
 743                         strcpy(nfs_path, BootFile);
 744                 }
 745         }
 746
 747         nfs_filename = basename(nfs_path);
 748         nfs_path     = dirname(nfs_path);
 749
 750         printf("Using %s device\n", eth_get_name());
 751
 752         printf("File transfer via NFS from server %pI4"
 753                 "; our IP address is %pI4", &NfsServerIP, &NetOurIP);
 754
 755         /* Check if we need to send across this subnet */
 756         if (NetOurGatewayIP && NetOurSubnetMask) {
 757                 IPaddr_t OurNet     = NetOurIP    & NetOurSubnetMask;
 758                 IPaddr_t ServerNet  = NetServerIP & NetOurSubnetMask;
 759
 760                 if (OurNet != ServerNet)
 761                         printf("; sending through gateway %pI4",
 762                                 &NetOurGatewayIP);
 763         }
 764         printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 765
 766         if (NetBootFileSize) {
 767                 printf(" Size is 0x%x Bytes = ", NetBootFileSize<<9);
 768                 print_size(NetBootFileSize<<9, "");
 769         }
 770         printf("\nLoad address: 0x%lx\n"
 771                 "Loading: *\b", load_addr);
 772
 773         NetSetTimeout(nfs_timeout, NfsTimeout);
 774         net_set_udp_handler(NfsHandler);
 775
 776         NfsTimeoutCount = 0;
 777         NfsState = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 778
 779         /*NfsOurPort = 4096 + (get_ticks() % 3072);*/
 780         /*FIX ME !!!*/
 781         NfsOurPort = 1000;
 782
 783         /* zero out server ether in case the server ip has changed */
 784         memset(NetServerEther, 0, 6);
 785
 786         NfsSend();
 787 }