git.sur5r.net Git - u-boot/blob - 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
  44 static int fs_mounted;
  45 static unsigned long rpc_id;
  46 static int nfs_offset = -1;
  47 static int nfs_len;
  48 static ulong nfs_timeout = NFS_TIMEOUT;
  49
  50 static char dirfh[NFS_FHSIZE];  /* file handle of directory */
  51 static char filefh[NFS_FHSIZE]; /* file handle of kernel image */
  52
  53 static enum net_loop_state nfs_download_state;
  54 static struct in_addr nfs_server_ip;
  55 static int nfs_server_mount_port;
  56 static int nfs_server_port;
  57 static int nfs_our_port;
  58 static int nfs_timeout_count;
  59 static 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
  68 static char *nfs_filename;
  69 static char *nfs_path;
  70 static char nfs_path_buff[2048];
  71
  72 static inline int store_block(uchar *src, unsigned offset, unsigned len)
  73 {
  74         ulong newsize = offset + len;
  75 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  76         int i, rc = 0;
  77
  78         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  79                 /* start address in flash? */
  80                 if (load_addr + offset >= flash_info[i].start[0]) {
  81                         rc = 1;
  82                         break;
  83                 }
  84         }
  85
  86         if (rc) { /* Flash is destination for this packet */
  87                 rc = flash_write((uchar *)src, (ulong)(load_addr+offset), len);
  88                 if (rc) {
  89                         flash_perror(rc);
  90                         return -1;
  91                 }
  92         } else
  93 #endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
  94         {
  95                 void *ptr = map_sysmem(load_addr + offset, len);
  96
  97                 memcpy(ptr, src, len);
  98                 unmap_sysmem(ptr);
  99         }
 100
 101         if (net_boot_file_size < (offset + len))
 102                 net_boot_file_size = newsize;
 103         return 0;
 104 }
 105
 106 static char *basename(char *path)
 107 {
 108         char *fname;
 109
 110         fname = path + strlen(path) - 1;
 111         while (fname >= path) {
 112                 if (*fname == '/') {
 113                         fname++;
 114                         break;
 115                 }
 116                 fname--;
 117         }
 118         return fname;
 119 }
 120
 121 static char *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 uint32_t *rpc_add_credentials(uint32_t *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 rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 178 {
 179         struct rpc_t pkt;
 180         unsigned long id;
 181         uint32_t *p;
 182         int pktlen;
 183         int sport;
 184
 185         id = ++rpc_id;
 186         pkt.u.call.id = htonl(id);
 187         pkt.u.call.type = htonl(MSG_CALL);
 188         pkt.u.call.rpcvers = htonl(2);  /* use RPC version 2 */
 189         pkt.u.call.prog = htonl(rpc_prog);
 190         pkt.u.call.vers = htonl(2);     /* portmapper is version 2 */
 191         pkt.u.call.proc = htonl(rpc_proc);
 192         p = (uint32_t *)&(pkt.u.call.data);
 193
 194         if (datalen)
 195                 memcpy((char *)p, (char *)data, datalen*sizeof(uint32_t));
 196
 197         pktlen = (char *)p + datalen*sizeof(uint32_t) - (char *)&pkt;
 198
 199         memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
 200                (char *)&pkt, pktlen);
 201
 202         if (rpc_prog == PROG_PORTMAP)
 203                 sport = SUNRPC_PORT;
 204         else if (rpc_prog == PROG_MOUNT)
 205                 sport = nfs_server_mount_port;
 206         else
 207                 sport = nfs_server_port;
 208
 209         net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
 210                             nfs_our_port, pktlen);
 211 }
 212
 213 /**************************************************************************
 214 RPC_LOOKUP - Lookup RPC Port numbers
 215 **************************************************************************/
 216 static void rpc_lookup_req(int prog, int ver)
 217 {
 218         uint32_t data[16];
 219
 220         data[0] = 0; data[1] = 0;       /* auth credential */
 221         data[2] = 0; data[3] = 0;       /* auth verifier */
 222         data[4] = htonl(prog);
 223         data[5] = htonl(ver);
 224         data[6] = htonl(17);    /* IP_UDP */
 225         data[7] = 0;
 226
 227         rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 228 }
 229
 230 /**************************************************************************
 231 NFS_MOUNT - Mount an NFS Filesystem
 232 **************************************************************************/
 233 static void nfs_mount_req(char *path)
 234 {
 235         uint32_t data[1024];
 236         uint32_t *p;
 237         int len;
 238         int pathlen;
 239
 240         pathlen = strlen(path);
 241
 242         p = &(data[0]);
 243         p = rpc_add_credentials(p);
 244
 245         *p++ = htonl(pathlen);
 246         if (pathlen & 3)
 247                 *(p + pathlen / 4) = 0;
 248         memcpy(p, path, pathlen);
 249         p += (pathlen + 3) / 4;
 250
 251         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 252
 253         rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 254 }
 255
 256 /**************************************************************************
 257 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 258 **************************************************************************/
 259 static void nfs_umountall_req(void)
 260 {
 261         uint32_t data[1024];
 262         uint32_t *p;
 263         int len;
 264
 265         if ((nfs_server_mount_port == -1) || (!fs_mounted))
 266                 /* Nothing mounted, nothing to umount */
 267                 return;
 268
 269         p = &(data[0]);
 270         p = rpc_add_credentials(p);
 271
 272         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 273
 274         rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 275 }
 276
 277 /***************************************************************************
 278  * NFS_READLINK (AH 2003-07-14)
 279  * This procedure is called when read of the first block fails -
 280  * this probably happens when it's a directory or a symlink
 281  * In case of successful readlink(), the dirname is manipulated,
 282  * so that inside the nfs() function a recursion can be done.
 283  **************************************************************************/
 284 static void nfs_readlink_req(void)
 285 {
 286         uint32_t data[1024];
 287         uint32_t *p;
 288         int len;
 289
 290         p = &(data[0]);
 291         p = rpc_add_credentials(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 /**************************************************************************
 302 NFS_LOOKUP - Lookup Pathname
 303 **************************************************************************/
 304 static void nfs_lookup_req(char *fname)
 305 {
 306         uint32_t data[1024];
 307         uint32_t *p;
 308         int len;
 309         int fnamelen;
 310
 311         fnamelen = strlen(fname);
 312
 313         p = &(data[0]);
 314         p = rpc_add_credentials(p);
 315
 316         memcpy(p, dirfh, NFS_FHSIZE);
 317         p += (NFS_FHSIZE / 4);
 318         *p++ = htonl(fnamelen);
 319         if (fnamelen & 3)
 320                 *(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 /**************************************************************************
 330 NFS_READ - Read File on NFS Server
 331 **************************************************************************/
 332 static void nfs_read_req(int offset, int readlen)
 333 {
 334         uint32_t data[1024];
 335         uint32_t *p;
 336         int len;
 337
 338         p = &(data[0]);
 339         p = rpc_add_credentials(p);
 340
 341         memcpy(p, filefh, NFS_FHSIZE);
 342         p += (NFS_FHSIZE / 4);
 343         *p++ = htonl(offset);
 344         *p++ = htonl(readlen);
 345         *p++ = 0;
 346
 347         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 348
 349         rpc_req(PROG_NFS, NFS_READ, data, len);
 350 }
 351
 352 /**************************************************************************
 353 RPC request dispatcher
 354 **************************************************************************/
 355 static void nfs_send(void)
 356 {
 357         debug("%s\n", __func__);
 358
 359         switch (nfs_state) {
 360         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 361                 rpc_lookup_req(PROG_MOUNT, 1);
 362                 break;
 363         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 364                 rpc_lookup_req(PROG_NFS, 2);
 365                 break;
 366         case STATE_MOUNT_REQ:
 367                 nfs_mount_req(nfs_path);
 368                 break;
 369         case STATE_UMOUNT_REQ:
 370                 nfs_umountall_req();
 371                 break;
 372         case STATE_LOOKUP_REQ:
 373                 nfs_lookup_req(nfs_filename);
 374                 break;
 375         case STATE_READ_REQ:
 376                 nfs_read_req(nfs_offset, nfs_len);
 377                 break;
 378         case STATE_READLINK_REQ:
 379                 nfs_readlink_req();
 380                 break;
 381         }
 382 }
 383
 384 /**************************************************************************
 385 Handlers for the reply from server
 386 **************************************************************************/
 387
 388 static int 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 -NFS_RPC_ERR;
 398         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 399                 return -NFS_RPC_DROP;
 400
 401         if (rpc_pkt.u.reply.rstatus  ||
 402             rpc_pkt.u.reply.verifier ||
 403             rpc_pkt.u.reply.astatus)
 404                 return -1;
 405
 406         switch (prog) {
 407         case PROG_MOUNT:
 408                 nfs_server_mount_port = ntohl(rpc_pkt.u.reply.data[0]);
 409                 break;
 410         case PROG_NFS:
 411                 nfs_server_port = ntohl(rpc_pkt.u.reply.data[0]);
 412                 break;
 413         }
 414
 415         return 0;
 416 }
 417
 418 static int 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 -NFS_RPC_ERR;
 428         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 429                 return -NFS_RPC_DROP;
 430
 431         if (rpc_pkt.u.reply.rstatus  ||
 432             rpc_pkt.u.reply.verifier ||
 433             rpc_pkt.u.reply.astatus  ||
 434             rpc_pkt.u.reply.data[0])
 435                 return -1;
 436
 437         fs_mounted = 1;
 438         memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 439
 440         return 0;
 441 }
 442
 443 static int 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 -NFS_RPC_ERR;
 453         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 454                 return -NFS_RPC_DROP;
 455
 456         if (rpc_pkt.u.reply.rstatus  ||
 457             rpc_pkt.u.reply.verifier ||
 458             rpc_pkt.u.reply.astatus)
 459                 return -1;
 460
 461         fs_mounted = 0;
 462         memset(dirfh, 0, sizeof(dirfh));
 463
 464         return 0;
 465 }
 466
 467 static int 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 -NFS_RPC_ERR;
 477         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 478                 return -NFS_RPC_DROP;
 479
 480         if (rpc_pkt.u.reply.rstatus  ||
 481             rpc_pkt.u.reply.verifier ||
 482             rpc_pkt.u.reply.astatus  ||
 483             rpc_pkt.u.reply.data[0]) {
 484                 switch (ntohl(rpc_pkt.u.reply.astatus)) {
 485                 case 0: /* Not an error */
 486                         break;
 487                 case 2: /* Remote can't support NFS version */
 488                         printf("*** ERROR: NFS version not supported: Requested: V%d, accepted: min V%d - max V%d\n",
 489                                2,
 490                                ntohl(rpc_pkt.u.reply.data[0]),
 491                                ntohl(rpc_pkt.u.reply.data[1]));
 492                         break;
 493                 default: /* Unknown error on 'accept state' flag */
 494                         printf("*** ERROR: accept state error (%d)\n",
 495                                ntohl(rpc_pkt.u.reply.astatus));
 496                         break;
 497                 }
 498                 return -1;
 499         }
 500
 501         memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 502
 503         return 0;
 504 }
 505
 506 static int nfs_readlink_reply(uchar *pkt, unsigned len)
 507 {
 508         struct rpc_t rpc_pkt;
 509         int rlen;
 510
 511         debug("%s\n", __func__);
 512
 513         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 514
 515         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 516                 return -NFS_RPC_ERR;
 517         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 518                 return -NFS_RPC_DROP;
 519
 520         if (rpc_pkt.u.reply.rstatus  ||
 521             rpc_pkt.u.reply.verifier ||
 522             rpc_pkt.u.reply.astatus  ||
 523             rpc_pkt.u.reply.data[0])
 524                 return -1;
 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]),
 533                        rlen);
 534                 nfs_path[pathlen + rlen] = 0;
 535         } else {
 536                 memcpy(nfs_path, (uchar *)&(rpc_pkt.u.reply.data[2]), rlen);
 537                 nfs_path[rlen] = 0;
 538         }
 539         return 0;
 540 }
 541
 542 static int 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 static void nfs_timeout_handler(void)
 585 {
 586         if (++nfs_timeout_count > NFS_RETRY_COUNT) {
 587                 puts("\nRetry count exceeded; starting again\n");
 588                 net_start_again();
 589         } else {
 590                 puts("T ");
 591                 net_set_timeout_handler(nfs_timeout +
 592                                         NFS_TIMEOUT * nfs_timeout_count,
 593                                         nfs_timeout_handler);
 594                 nfs_send();
 595         }
 596 }
 597
 598 static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 599                         unsigned src, unsigned len)
 600 {
 601         int rlen;
 602         int reply;
 603
 604         debug("%s\n", __func__);
 605
 606         if (dest != nfs_our_port)
 607                 return;
 608
 609         switch (nfs_state) {
 610         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 611                 if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
 612                         break;
 613                 nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
 614                 nfs_send();
 615                 break;
 616
 617         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 618                 if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
 619                         break;
 620                 nfs_state = STATE_MOUNT_REQ;
 621                 nfs_send();
 622                 break;
 623
 624         case STATE_MOUNT_REQ:
 625                 reply = nfs_mount_reply(pkt, len);
 626                 if (reply == -NFS_RPC_DROP) {
 627                         break;
 628                 } else if (reply == -NFS_RPC_ERR) {
 629                         puts("*** ERROR: Cannot mount\n");
 630                         /* just to be sure... */
 631                         nfs_state = STATE_UMOUNT_REQ;
 632                         nfs_send();
 633                 } else {
 634                         nfs_state = STATE_LOOKUP_REQ;
 635                         nfs_send();
 636                 }
 637                 break;
 638
 639         case STATE_UMOUNT_REQ:
 640                 reply = nfs_umountall_reply(pkt, len);
 641                 if (reply == -NFS_RPC_DROP) {
 642                         break;
 643                 } else if (reply == -NFS_RPC_ERR) {
 644                         puts("*** ERROR: Cannot umount\n");
 645                         net_set_state(NETLOOP_FAIL);
 646                 } else {
 647                         puts("\ndone\n");
 648                         net_set_state(nfs_download_state);
 649                 }
 650                 break;
 651
 652         case STATE_LOOKUP_REQ:
 653                 reply = nfs_lookup_reply(pkt, len);
 654                 if (reply == -NFS_RPC_DROP) {
 655                         break;
 656                 } else if (reply == -NFS_RPC_ERR) {
 657                         puts("*** ERROR: File lookup fail\n");
 658                         nfs_state = STATE_UMOUNT_REQ;
 659                         nfs_send();
 660                 } else {
 661                         nfs_state = STATE_READ_REQ;
 662                         nfs_offset = 0;
 663                         nfs_len = NFS_READ_SIZE;
 664                         nfs_send();
 665                 }
 666                 break;
 667
 668         case STATE_READLINK_REQ:
 669                 reply = nfs_readlink_reply(pkt, len);
 670                 if (reply == -NFS_RPC_DROP) {
 671                         break;
 672                 } else if (reply == -NFS_RPC_ERR) {
 673                         puts("*** ERROR: Symlink fail\n");
 674                         nfs_state = STATE_UMOUNT_REQ;
 675                         nfs_send();
 676                 } else {
 677                         debug("Symlink --> %s\n", nfs_path);
 678                         nfs_filename = basename(nfs_path);
 679                         nfs_path     = dirname(nfs_path);
 680
 681                         nfs_state = STATE_MOUNT_REQ;
 682                         nfs_send();
 683                 }
 684                 break;
 685
 686         case STATE_READ_REQ:
 687                 rlen = nfs_read_reply(pkt, len);
 688                 net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 689                 if (rlen > 0) {
 690                         nfs_offset += rlen;
 691                         nfs_send();
 692                 } else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
 693                         /* symbolic link */
 694                         nfs_state = STATE_READLINK_REQ;
 695                         nfs_send();
 696                 } else {
 697                         if (!rlen)
 698                                 nfs_download_state = NETLOOP_SUCCESS;
 699                         nfs_state = STATE_UMOUNT_REQ;
 700                         nfs_send();
 701                 }
 702                 break;
 703         }
 704 }
 705
 706
 707 void nfs_start(void)
 708 {
 709         debug("%s\n", __func__);
 710         nfs_download_state = NETLOOP_FAIL;
 711
 712         nfs_server_ip = net_server_ip;
 713         nfs_path = (char *)nfs_path_buff;
 714
 715         if (nfs_path == NULL) {
 716                 net_set_state(NETLOOP_FAIL);
 717                 puts("*** ERROR: Fail allocate memory\n");
 718                 return;
 719         }
 720
 721         if (net_boot_file_name[0] == '\0') {
 722                 sprintf(nfs_path, "/nfsroot/%02X%02X%02X%02X.img",
 723                         net_ip.s_addr & 0xFF,
 724                         (net_ip.s_addr >>  8) & 0xFF,
 725                         (net_ip.s_addr >> 16) & 0xFF,
 726                         (net_ip.s_addr >> 24) & 0xFF);
 727
 728                 printf("*** Warning: no boot file name; using '%s'\n",
 729                        nfs_path);
 730         } else {
 731                 char *p = net_boot_file_name;
 732
 733                 p = strchr(p, ':');
 734
 735                 if (p != NULL) {
 736                         nfs_server_ip = string_to_ip(net_boot_file_name);
 737                         ++p;
 738                         strcpy(nfs_path, p);
 739                 } else {
 740                         strcpy(nfs_path, net_boot_file_name);
 741                 }
 742         }
 743
 744         nfs_filename = basename(nfs_path);
 745         nfs_path     = dirname(nfs_path);
 746
 747         printf("Using %s device\n", eth_get_name());
 748
 749         printf("File transfer via NFS from server %pI4; our IP address is %pI4",
 750                &nfs_server_ip, &net_ip);
 751
 752         /* Check if we need to send across this subnet */
 753         if (net_gateway.s_addr && net_netmask.s_addr) {
 754                 struct in_addr our_net;
 755                 struct in_addr server_net;
 756
 757                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 758                 server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
 759                 if (our_net.s_addr != server_net.s_addr)
 760                         printf("; sending through gateway %pI4",
 761                                &net_gateway);
 762         }
 763         printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 764
 765         if (net_boot_file_expected_size_in_blocks) {
 766                 printf(" Size is 0x%x Bytes = ",
 767                        net_boot_file_expected_size_in_blocks << 9);
 768                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 769         }
 770         printf("\nLoad address: 0x%lx\n"
 771                 "Loading: *\b", load_addr);
 772
 773         net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 774         net_set_udp_handler(nfs_handler);
 775
 776         nfs_timeout_count = 0;
 777         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 778
 779         /*nfs_our_port = 4096 + (get_ticks() % 3072);*/
 780         /*FIX ME !!!*/
 781         nfs_our_port = 1000;
 782
 783         /* zero out server ether in case the server ip has changed */
 784         memset(net_server_ethaddr, 0, 6);
 785
 786         nfs_send();
 787 }