net/nfs.c

   1 /*
   2  * NFS support driver - based on etherboot and U-BOOT's tftp.c
   3  *
   4  * Masami Komiya <[email protected]> 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 /* NOTE 4: NFSv3 support added by Guillaume GARDET, 2016-June-20.
  26  * NFSv2 is still used by default. But if server does not support NFSv2, then
  27  * NFSv3 is used, if available on NFS server. */
  28
  29 #include <common.h>
  30 #include <command.h>
  31 #include <display_options.h>
  32 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  33 #include <flash.h>
  34 #endif
  35 #include <image.h>
  36 #include <log.h>
  37 #include <net.h>
  38 #include <malloc.h>
  39 #include <mapmem.h>
  40 #include "nfs.h"
  41 #include "bootp.h"
  42 #include <time.h>
  43
  44 #define HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  45 #define NFS_RETRY_COUNT 30
  46
  47 #define NFS_RPC_ERR     1
  48 #define NFS_RPC_DROP    124
  49
  50 static int fs_mounted;
  51 static unsigned long rpc_id;
  52 static int nfs_offset = -1;
  53 static int nfs_len;
  54 static const ulong nfs_timeout = CONFIG_NFS_TIMEOUT;
  55
  56 static char dirfh[NFS_FHSIZE];  /* NFSv2 / NFSv3 file handle of directory */
  57 static char filefh[NFS3_FHSIZE]; /* NFSv2 / NFSv3 file handle */
  58 static unsigned int filefh3_length;     /* (variable) length of filefh when NFSv3 */
  59
  60 static enum net_loop_state nfs_download_state;
  61 static struct in_addr nfs_server_ip;
  62 static int nfs_server_mount_port;
  63 static int nfs_server_port;
  64 static int nfs_our_port;
  65 static int nfs_timeout_count;
  66 static int nfs_state;
  67 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  68 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  69 #define STATE_MOUNT_REQ                 3
  70 #define STATE_UMOUNT_REQ                4
  71 #define STATE_LOOKUP_REQ                5
  72 #define STATE_READ_REQ                  6
  73 #define STATE_READLINK_REQ              7
  74
  75 static char *nfs_filename;
  76 static char *nfs_path;
  77 static char nfs_path_buff[2048];
  78
  79 enum nfs_version {
  80         NFS_UNKOWN = 0,
  81         NFS_V2 = 2,
  82         NFS_V3 = 3,
  83 };
  84
  85 static enum nfs_version choosen_nfs_version = NFS_V3;
  86 static inline int store_block(uchar *src, unsigned offset, unsigned len)
  87 {
  88         ulong newsize = offset + len;
  89 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  90         int i, rc = 0;
  91
  92         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  93                 /* start address in flash? */
  94                 if (image_load_addr + offset >= flash_info[i].start[0]) {
  95                         rc = 1;
  96                         break;
  97                 }
  98         }
  99
 100         if (rc) { /* Flash is destination for this packet */
 101                 rc = flash_write((uchar *)src, (ulong)image_load_addr + offset,
 102                                  len);
 103                 if (rc) {
 104                         flash_perror(rc);
 105                         return -1;
 106                 }
 107         } else
 108 #endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
 109         {
 110                 void *ptr = map_sysmem(image_load_addr + offset, len);
 111
 112                 memcpy(ptr, src, len);
 113                 unmap_sysmem(ptr);
 114         }
 115
 116         if (net_boot_file_size < (offset + len))
 117                 net_boot_file_size = newsize;
 118         return 0;
 119 }
 120
 121 static char *basename(char *path)
 122 {
 123         char *fname;
 124
 125         fname = path + strlen(path) - 1;
 126         while (fname >= path) {
 127                 if (*fname == '/') {
 128                         fname++;
 129                         break;
 130                 }
 131                 fname--;
 132         }
 133         return fname;
 134 }
 135
 136 static char *dirname(char *path)
 137 {
 138         char *fname;
 139
 140         fname = basename(path);
 141         --fname;
 142         *fname = '\0';
 143         return path;
 144 }
 145
 146 /**************************************************************************
 147 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 148 **************************************************************************/
 149 static uint32_t *rpc_add_credentials(uint32_t *p)
 150 {
 151         /* Here's the executive summary on authentication requirements of the
 152          * various NFS server implementations:  Linux accepts both AUTH_NONE
 153          * and AUTH_UNIX authentication (also accepts an empty hostname field
 154          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 155          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 156          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 157          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 158          * hostname).  */
 159
 160         /* Provide an AUTH_UNIX credential.  */
 161         *p++ = htonl(1);                /* AUTH_UNIX */
 162         *p++ = htonl(20);               /* auth length */
 163         *p++ = 0;                       /* stamp */
 164         *p++ = 0;                       /* hostname string */
 165         *p++ = 0;                       /* uid */
 166         *p++ = 0;                       /* gid */
 167         *p++ = 0;                       /* auxiliary gid list */
 168
 169         /* Provide an AUTH_NONE verifier.  */
 170         *p++ = 0;                       /* AUTH_NONE */
 171         *p++ = 0;                       /* auth length */
 172
 173         return p;
 174 }
 175
 176 /**************************************************************************
 177 RPC_LOOKUP - Lookup RPC Port numbers
 178 **************************************************************************/
 179 static void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 180 {
 181         struct rpc_t rpc_pkt;
 182         unsigned long id;
 183         uint32_t *p;
 184         int pktlen;
 185         int sport;
 186
 187         id = ++rpc_id;
 188         rpc_pkt.u.call.id = htonl(id);
 189         rpc_pkt.u.call.type = htonl(MSG_CALL);
 190         rpc_pkt.u.call.rpcvers = htonl(2);      /* use RPC version 2 */
 191         rpc_pkt.u.call.prog = htonl(rpc_prog);
 192         switch (rpc_prog) {
 193         case PROG_NFS:
 194                 switch (choosen_nfs_version) {
 195                 case NFS_V2:
 196                         rpc_pkt.u.call.vers = htonl(2);
 197                         break;
 198
 199                 case NFS_V3:
 200                         rpc_pkt.u.call.vers = htonl(3);
 201                         break;
 202
 203                 case NFS_UNKOWN:
 204                         /* nothing to do */
 205                         break;
 206                 }
 207                 break;
 208         case PROG_PORTMAP:
 209         case PROG_MOUNT:
 210         default:
 211                 rpc_pkt.u.call.vers = htonl(2); /* portmapper is version 2 */
 212         }
 213         rpc_pkt.u.call.proc = htonl(rpc_proc);
 214         p = rpc_pkt.u.call.data;
 215
 216         if (datalen)
 217                 memcpy(p, data, datalen * sizeof(uint32_t));
 218
 219         pktlen = (char *)p + datalen * sizeof(uint32_t) - (char *)&rpc_pkt;
 220
 221         memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
 222                &rpc_pkt.u.data[0], pktlen);
 223
 224         if (rpc_prog == PROG_PORTMAP)
 225                 sport = SUNRPC_PORT;
 226         else if (rpc_prog == PROG_MOUNT)
 227                 sport = nfs_server_mount_port;
 228         else
 229                 sport = nfs_server_port;
 230
 231         net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
 232                             nfs_our_port, pktlen);
 233 }
 234
 235 /**************************************************************************
 236 RPC_LOOKUP - Lookup RPC Port numbers
 237 **************************************************************************/
 238 static void rpc_lookup_req(int prog, int ver)
 239 {
 240         uint32_t data[16];
 241
 242         data[0] = 0; data[1] = 0;       /* auth credential */
 243         data[2] = 0; data[3] = 0;       /* auth verifier */
 244         data[4] = htonl(prog);
 245         data[5] = htonl(ver);
 246         data[6] = htonl(17);    /* IP_UDP */
 247         data[7] = 0;
 248         rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 249 }
 250
 251 /**************************************************************************
 252 NFS_MOUNT - Mount an NFS Filesystem
 253 **************************************************************************/
 254 static void nfs_mount_req(char *path)
 255 {
 256         uint32_t data[1024];
 257         uint32_t *p;
 258         int len;
 259         int pathlen;
 260
 261         pathlen = strlen(path);
 262
 263         p = &(data[0]);
 264         p = rpc_add_credentials(p);
 265
 266         *p++ = htonl(pathlen);
 267         if (pathlen & 3)
 268                 *(p + pathlen / 4) = 0;
 269         memcpy(p, path, pathlen);
 270         p += (pathlen + 3) / 4;
 271
 272         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 273
 274         rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 275 }
 276
 277 /**************************************************************************
 278 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 279 **************************************************************************/
 280 static void nfs_umountall_req(void)
 281 {
 282         uint32_t data[1024];
 283         uint32_t *p;
 284         int len;
 285
 286         if ((nfs_server_mount_port == -1) || (!fs_mounted))
 287                 /* Nothing mounted, nothing to umount */
 288                 return;
 289
 290         p = &(data[0]);
 291         p = rpc_add_credentials(p);
 292
 293         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 294
 295         rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 296 }
 297
 298 /***************************************************************************
 299  * NFS_READLINK (AH 2003-07-14)
 300  * This procedure is called when read of the first block fails -
 301  * this probably happens when it's a directory or a symlink
 302  * In case of successful readlink(), the dirname is manipulated,
 303  * so that inside the nfs() function a recursion can be done.
 304  **************************************************************************/
 305 static void nfs_readlink_req(void)
 306 {
 307         uint32_t data[1024];
 308         uint32_t *p;
 309         int len;
 310
 311         p = &(data[0]);
 312         p = rpc_add_credentials(p);
 313
 314         if (choosen_nfs_version == NFS_V2) {
 315                 memcpy(p, filefh, NFS_FHSIZE);
 316                 p += (NFS_FHSIZE / 4);
 317         } else { /* NFS_V3 */
 318                 *p++ = htonl(filefh3_length);
 319                 memcpy(p, filefh, filefh3_length);
 320                 p += (filefh3_length / 4);
 321         }
 322
 323         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 324
 325         rpc_req(PROG_NFS, NFS_READLINK, data, len);
 326 }
 327
 328 /**************************************************************************
 329 NFS_LOOKUP - Lookup Pathname
 330 **************************************************************************/
 331 static void nfs_lookup_req(char *fname)
 332 {
 333         uint32_t data[1024];
 334         uint32_t *p;
 335         int len;
 336         int fnamelen;
 337
 338         fnamelen = strlen(fname);
 339
 340         p = &(data[0]);
 341         p = rpc_add_credentials(p);
 342
 343         if (choosen_nfs_version == NFS_V2) {
 344                 memcpy(p, dirfh, NFS_FHSIZE);
 345                 p += (NFS_FHSIZE / 4);
 346                 *p++ = htonl(fnamelen);
 347                 if (fnamelen & 3)
 348                         *(p + fnamelen / 4) = 0;
 349                 memcpy(p, fname, fnamelen);
 350                 p += (fnamelen + 3) / 4;
 351
 352                 len = (uint32_t *)p - (uint32_t *)&(data[0]);
 353
 354                 rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
 355         } else {  /* NFS_V3 */
 356                 *p++ = htonl(NFS_FHSIZE);       /* Dir handle length */
 357                 memcpy(p, dirfh, NFS_FHSIZE);
 358                 p += (NFS_FHSIZE / 4);
 359                 *p++ = htonl(fnamelen);
 360                 if (fnamelen & 3)
 361                         *(p + fnamelen / 4) = 0;
 362                 memcpy(p, fname, fnamelen);
 363                 p += (fnamelen + 3) / 4;
 364
 365                 len = (uint32_t *)p - (uint32_t *)&(data[0]);
 366
 367                 rpc_req(PROG_NFS, NFS3PROC_LOOKUP, data, len);
 368         }
 369 }
 370
 371 /**************************************************************************
 372 NFS_READ - Read File on NFS Server
 373 **************************************************************************/
 374 static void nfs_read_req(int offset, int readlen)
 375 {
 376         uint32_t data[1024];
 377         uint32_t *p;
 378         int len;
 379
 380         p = &(data[0]);
 381         p = rpc_add_credentials(p);
 382
 383         if (choosen_nfs_version == NFS_V2) {
 384                 memcpy(p, filefh, NFS_FHSIZE);
 385                 p += (NFS_FHSIZE / 4);
 386                 *p++ = htonl(offset);
 387                 *p++ = htonl(readlen);
 388                 *p++ = 0;
 389         } else { /* NFS_V3 */
 390                 *p++ = htonl(filefh3_length);
 391                 memcpy(p, filefh, filefh3_length);
 392                 p += (filefh3_length / 4);
 393                 *p++ = htonl(0); /* offset is 64-bit long, so fill with 0 */
 394                 *p++ = htonl(offset);
 395                 *p++ = htonl(readlen);
 396                 *p++ = 0;
 397         }
 398
 399         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 400
 401         rpc_req(PROG_NFS, NFS_READ, data, len);
 402 }
 403
 404 /**************************************************************************
 405 RPC request dispatcher
 406 **************************************************************************/
 407 static void nfs_send(void)
 408 {
 409         debug("%s\n", __func__);
 410
 411         switch (nfs_state) {
 412         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 413                 if (choosen_nfs_version == NFS_V2)
 414                         rpc_lookup_req(PROG_MOUNT, 1);
 415                 else  /* NFS_V3 */
 416                         rpc_lookup_req(PROG_MOUNT, 3);
 417                 break;
 418         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 419                 if (choosen_nfs_version == NFS_V2)
 420                         rpc_lookup_req(PROG_NFS, 2);
 421                 else  /* NFS_V3 */
 422                         rpc_lookup_req(PROG_NFS, 3);
 423                 break;
 424         case STATE_MOUNT_REQ:
 425                 nfs_mount_req(nfs_path);
 426                 break;
 427         case STATE_UMOUNT_REQ:
 428                 nfs_umountall_req();
 429                 break;
 430         case STATE_LOOKUP_REQ:
 431                 nfs_lookup_req(nfs_filename);
 432                 break;
 433         case STATE_READ_REQ:
 434                 nfs_read_req(nfs_offset, nfs_len);
 435                 break;
 436         case STATE_READLINK_REQ:
 437                 nfs_readlink_req();
 438                 break;
 439         }
 440 }
 441
 442 /**************************************************************************
 443 Handlers for the reply from server
 444 **************************************************************************/
 445
 446 static int rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
 447 {
 448         struct rpc_t rpc_pkt;
 449
 450         memcpy(&rpc_pkt.u.data[0], pkt, len);
 451
 452         debug("%s\n", __func__);
 453
 454         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 455                 return -NFS_RPC_ERR;
 456         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 457                 return -NFS_RPC_DROP;
 458
 459         if (rpc_pkt.u.reply.rstatus  ||
 460             rpc_pkt.u.reply.verifier ||
 461             rpc_pkt.u.reply.astatus)
 462                 return -1;
 463
 464         switch (prog) {
 465         case PROG_MOUNT:
 466                 nfs_server_mount_port = ntohl(rpc_pkt.u.reply.data[0]);
 467                 break;
 468         case PROG_NFS:
 469                 nfs_server_port = ntohl(rpc_pkt.u.reply.data[0]);
 470                 break;
 471         }
 472
 473         return 0;
 474 }
 475
 476 static int nfs_mount_reply(uchar *pkt, unsigned len)
 477 {
 478         struct rpc_t rpc_pkt;
 479
 480         debug("%s\n", __func__);
 481
 482         memcpy(&rpc_pkt.u.data[0], pkt, len);
 483
 484         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 485                 return -NFS_RPC_ERR;
 486         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 487                 return -NFS_RPC_DROP;
 488
 489         if (rpc_pkt.u.reply.rstatus  ||
 490             rpc_pkt.u.reply.verifier ||
 491             rpc_pkt.u.reply.astatus  ||
 492             rpc_pkt.u.reply.data[0])
 493                 return -1;
 494
 495         fs_mounted = 1;
 496         /*  NFSv2 and NFSv3 use same structure */
 497         memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 498
 499         return 0;
 500 }
 501
 502 static int nfs_umountall_reply(uchar *pkt, unsigned len)
 503 {
 504         struct rpc_t rpc_pkt;
 505
 506         debug("%s\n", __func__);
 507
 508         memcpy(&rpc_pkt.u.data[0], pkt, len);
 509
 510         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 511                 return -NFS_RPC_ERR;
 512         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 513                 return -NFS_RPC_DROP;
 514
 515         if (rpc_pkt.u.reply.rstatus  ||
 516             rpc_pkt.u.reply.verifier ||
 517             rpc_pkt.u.reply.astatus)
 518                 return -1;
 519
 520         fs_mounted = 0;
 521         memset(dirfh, 0, sizeof(dirfh));
 522
 523         return 0;
 524 }
 525
 526 static int nfs_lookup_reply(uchar *pkt, unsigned len)
 527 {
 528         struct rpc_t rpc_pkt;
 529
 530         debug("%s\n", __func__);
 531
 532         memcpy(&rpc_pkt.u.data[0], pkt, len);
 533
 534         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 535                 return -NFS_RPC_ERR;
 536         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 537                 return -NFS_RPC_DROP;
 538
 539         if (rpc_pkt.u.reply.rstatus  ||
 540             rpc_pkt.u.reply.verifier ||
 541             rpc_pkt.u.reply.astatus  ||
 542             rpc_pkt.u.reply.data[0]) {
 543                 switch (ntohl(rpc_pkt.u.reply.astatus)) {
 544                 case NFS_RPC_SUCCESS: /* Not an error */
 545                         break;
 546                 case NFS_RPC_PROG_MISMATCH: {
 547                         /* Remote can't support NFS version */
 548                         const int min = ntohl(rpc_pkt.u.reply.data[0]);
 549                         const int max = ntohl(rpc_pkt.u.reply.data[1]);
 550
 551                         if (max < NFS_V2 || max > NFS_V3 || min > NFS_V3) {
 552                                 puts("*** ERROR: NFS version not supported");
 553                                 debug(": Requested: V%d, accepted: min V%d - max V%d\n",
 554                                       choosen_nfs_version,
 555                                       ntohl(rpc_pkt.u.reply.data[0]),
 556                                       ntohl(rpc_pkt.u.reply.data[1]));
 557                                 puts("\n");
 558                                 choosen_nfs_version = NFS_UNKOWN;
 559                                 break;
 560                         }
 561
 562                         debug("*** Warning: NFS version not supported: Requested: V%d, accepted: min V%d - max V%d\n",
 563                               choosen_nfs_version,
 564                               ntohl(rpc_pkt.u.reply.data[0]),
 565                               ntohl(rpc_pkt.u.reply.data[1]));
 566                         debug("Will retry with NFSv%d\n", min);
 567                         choosen_nfs_version = min;
 568                         return -NFS_RPC_PROG_MISMATCH;
 569                 }
 570                 case NFS_RPC_PROG_UNAVAIL:
 571                 case NFS_RPC_PROC_UNAVAIL:
 572                 case NFS_RPC_GARBAGE_ARGS:
 573                 case NFS_RPC_SYSTEM_ERR:
 574                 default: /* Unknown error on 'accept state' flag */
 575                         debug("*** ERROR: accept state error (%d)\n",
 576                               ntohl(rpc_pkt.u.reply.astatus));
 577                         break;
 578                 }
 579                 return -1;
 580         }
 581
 582         if (choosen_nfs_version == NFS_V2) {
 583                 if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + NFS_FHSIZE) > len)
 584                         return -NFS_RPC_DROP;
 585                 memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 586         } else {  /* NFS_V3 */
 587                 filefh3_length = ntohl(rpc_pkt.u.reply.data[1]);
 588                 if (filefh3_length > NFS3_FHSIZE)
 589                         filefh3_length  = NFS3_FHSIZE;
 590                 memcpy(filefh, rpc_pkt.u.reply.data + 2, filefh3_length);
 591         }
 592
 593         return 0;
 594 }
 595
 596 static int nfs3_get_attributes_offset(uint32_t *data)
 597 {
 598         if (data[1]) {
 599                 /* 'attributes_follow' flag is TRUE,
 600                  * so we have attributes on 21 dwords */
 601                 /* Skip unused values :
 602                         type;   32 bits value,
 603                         mode;   32 bits value,
 604                         nlink;  32 bits value,
 605                         uid;    32 bits value,
 606                         gid;    32 bits value,
 607                         size;   64 bits value,
 608                         used;   64 bits value,
 609                         rdev;   64 bits value,
 610                         fsid;   64 bits value,
 611                         fileid; 64 bits value,
 612                         atime;  64 bits value,
 613                         mtime;  64 bits value,
 614                         ctime;  64 bits value,
 615                 */
 616                 return 22;
 617         } else {
 618                 /* 'attributes_follow' flag is FALSE,
 619                  * so we don't have any attributes */
 620                 return 1;
 621         }
 622 }
 623
 624 static int nfs_readlink_reply(uchar *pkt, unsigned len)
 625 {
 626         struct rpc_t rpc_pkt;
 627         int rlen;
 628         int nfsv3_data_offset = 0;
 629
 630         debug("%s\n", __func__);
 631
 632         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 633
 634         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 635                 return -NFS_RPC_ERR;
 636         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 637                 return -NFS_RPC_DROP;
 638
 639         if (rpc_pkt.u.reply.rstatus  ||
 640             rpc_pkt.u.reply.verifier ||
 641             rpc_pkt.u.reply.astatus  ||
 642             rpc_pkt.u.reply.data[0])
 643                 return -1;
 644
 645         if (choosen_nfs_version == NFS_V3) {
 646                 nfsv3_data_offset =
 647                         nfs3_get_attributes_offset(rpc_pkt.u.reply.data);
 648         }
 649
 650         /* new path length */
 651         rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]);
 652
 653         if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + rlen) > len)
 654                 return -NFS_RPC_DROP;
 655
 656         if (*((char *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset])) != '/') {
 657                 int pathlen;
 658
 659                 strcat(nfs_path, "/");
 660                 pathlen = strlen(nfs_path);
 661                 memcpy(nfs_path + pathlen,
 662                        (uchar *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset]),
 663                        rlen);
 664                 nfs_path[pathlen + rlen] = 0;
 665         } else {
 666                 memcpy(nfs_path,
 667                        (uchar *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset]),
 668                        rlen);
 669                 nfs_path[rlen] = 0;
 670         }
 671         return 0;
 672 }
 673
 674 static int nfs_read_reply(uchar *pkt, unsigned len)
 675 {
 676         struct rpc_t rpc_pkt;
 677         int rlen;
 678         uchar *data_ptr;
 679
 680         debug("%s\n", __func__);
 681
 682         memcpy(&rpc_pkt.u.data[0], pkt, sizeof(rpc_pkt.u.reply));
 683
 684         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 685                 return -NFS_RPC_ERR;
 686         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 687                 return -NFS_RPC_DROP;
 688
 689         if (rpc_pkt.u.reply.rstatus  ||
 690             rpc_pkt.u.reply.verifier ||
 691             rpc_pkt.u.reply.astatus  ||
 692             rpc_pkt.u.reply.data[0]) {
 693                 if (rpc_pkt.u.reply.rstatus)
 694                         return -9999;
 695                 if (rpc_pkt.u.reply.astatus)
 696                         return -9999;
 697                 return -ntohl(rpc_pkt.u.reply.data[0]);
 698         }
 699
 700         if ((nfs_offset != 0) && !((nfs_offset) %
 701                         (NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
 702                 puts("\n\t ");
 703         if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
 704                 putc('#');
 705
 706         if (choosen_nfs_version == NFS_V2) {
 707                 rlen = ntohl(rpc_pkt.u.reply.data[18]);
 708                 data_ptr = (uchar *)&(rpc_pkt.u.reply.data[19]);
 709         } else {  /* NFS_V3 */
 710                 int nfsv3_data_offset =
 711                         nfs3_get_attributes_offset(rpc_pkt.u.reply.data);
 712
 713                 /* count value */
 714                 rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]);
 715                 /* Skip unused values :
 716                         EOF:            32 bits value,
 717                         data_size:      32 bits value,
 718                 */
 719                 data_ptr = (uchar *)
 720                         &(rpc_pkt.u.reply.data[4 + nfsv3_data_offset]);
 721         }
 722
 723         if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + rlen) > len)
 724                         return -9999;
 725
 726         if (store_block(data_ptr, nfs_offset, rlen))
 727                         return -9999;
 728
 729         return rlen;
 730 }
 731
 732 /**************************************************************************
 733 Interfaces of U-BOOT
 734 **************************************************************************/
 735 static void nfs_timeout_handler(void)
 736 {
 737         if (++nfs_timeout_count > NFS_RETRY_COUNT) {
 738                 puts("\nRetry count exceeded; starting again\n");
 739                 net_start_again();
 740         } else {
 741                 puts("T ");
 742                 net_set_timeout_handler(nfs_timeout +
 743                                         nfs_timeout * nfs_timeout_count,
 744                                         nfs_timeout_handler);
 745                 nfs_send();
 746         }
 747 }
 748
 749 static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 750                         unsigned src, unsigned len)
 751 {
 752         int rlen;
 753         int reply;
 754
 755         debug("%s\n", __func__);
 756
 757         if (len > sizeof(struct rpc_t))
 758                 return;
 759
 760         if (dest != nfs_our_port)
 761                 return;
 762
 763         switch (nfs_state) {
 764         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 765                 if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
 766                         break;
 767                 nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
 768                 nfs_send();
 769                 break;
 770
 771         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 772                 if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
 773                         break;
 774                 nfs_state = STATE_MOUNT_REQ;
 775                 nfs_send();
 776                 break;
 777
 778         case STATE_MOUNT_REQ:
 779                 reply = nfs_mount_reply(pkt, len);
 780                 if (reply == -NFS_RPC_DROP) {
 781                         break;
 782                 } else if (reply == -NFS_RPC_ERR) {
 783                         puts("*** ERROR: Cannot mount\n");
 784                         /* just to be sure... */
 785                         nfs_state = STATE_UMOUNT_REQ;
 786                         nfs_send();
 787                 } else {
 788                         nfs_state = STATE_LOOKUP_REQ;
 789                         nfs_send();
 790                 }
 791                 break;
 792
 793         case STATE_UMOUNT_REQ:
 794                 reply = nfs_umountall_reply(pkt, len);
 795                 if (reply == -NFS_RPC_DROP) {
 796                         break;
 797                 } else if (reply == -NFS_RPC_ERR) {
 798                         debug("*** ERROR: Cannot umount\n");
 799                         net_set_state(NETLOOP_FAIL);
 800                 } else {
 801                         puts("\ndone\n");
 802                         net_set_state(nfs_download_state);
 803                 }
 804                 break;
 805
 806         case STATE_LOOKUP_REQ:
 807                 reply = nfs_lookup_reply(pkt, len);
 808                 if (reply == -NFS_RPC_DROP) {
 809                         break;
 810                 } else if (reply == -NFS_RPC_ERR) {
 811                         puts("*** ERROR: File lookup fail\n");
 812                         nfs_state = STATE_UMOUNT_REQ;
 813                         nfs_send();
 814                 } else if (reply == -NFS_RPC_PROG_MISMATCH &&
 815                            choosen_nfs_version != NFS_UNKOWN) {
 816                         /* umount */
 817                         nfs_state = STATE_UMOUNT_REQ;
 818                         nfs_send();
 819                         /* And retry with another supported version */
 820                         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 821                         nfs_send();
 822                 } else {
 823                         nfs_state = STATE_READ_REQ;
 824                         nfs_offset = 0;
 825                         nfs_len = NFS_READ_SIZE;
 826                         nfs_send();
 827                 }
 828                 break;
 829
 830         case STATE_READLINK_REQ:
 831                 reply = nfs_readlink_reply(pkt, len);
 832                 if (reply == -NFS_RPC_DROP) {
 833                         break;
 834                 } else if (reply == -NFS_RPC_ERR) {
 835                         puts("*** ERROR: Symlink fail\n");
 836                         nfs_state = STATE_UMOUNT_REQ;
 837                         nfs_send();
 838                 } else {
 839                         debug("Symlink --> %s\n", nfs_path);
 840                         nfs_filename = basename(nfs_path);
 841                         nfs_path     = dirname(nfs_path);
 842
 843                         nfs_state = STATE_MOUNT_REQ;
 844                         nfs_send();
 845                 }
 846                 break;
 847
 848         case STATE_READ_REQ:
 849                 rlen = nfs_read_reply(pkt, len);
 850                 if (rlen == -NFS_RPC_DROP)
 851                         break;
 852                 net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 853                 if (rlen > 0) {
 854                         nfs_offset += rlen;
 855                         nfs_send();
 856                 } else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
 857                         /* symbolic link */
 858                         nfs_state = STATE_READLINK_REQ;
 859                         nfs_send();
 860                 } else {
 861                         if (!rlen)
 862                                 nfs_download_state = NETLOOP_SUCCESS;
 863                         if (rlen < 0)
 864                                 debug("NFS READ error (%d)\n", rlen);
 865                         nfs_state = STATE_UMOUNT_REQ;
 866                         nfs_send();
 867                 }
 868                 break;
 869         }
 870 }
 871
 872
 873 void nfs_start(void)
 874 {
 875         debug("%s\n", __func__);
 876         nfs_download_state = NETLOOP_FAIL;
 877
 878         nfs_server_ip = net_server_ip;
 879         nfs_path = (char *)nfs_path_buff;
 880
 881         if (nfs_path == NULL) {
 882                 net_set_state(NETLOOP_FAIL);
 883                 printf("*** ERROR: Fail allocate memory\n");
 884                 return;
 885         }
 886
 887         if (!net_parse_bootfile(&nfs_server_ip, nfs_path,
 888                                 sizeof(nfs_path_buff))) {
 889                 sprintf(nfs_path, "/nfsroot/%02X%02X%02X%02X.img",
 890                         net_ip.s_addr & 0xFF,
 891                         (net_ip.s_addr >>  8) & 0xFF,
 892                         (net_ip.s_addr >> 16) & 0xFF,
 893                         (net_ip.s_addr >> 24) & 0xFF);
 894
 895                 printf("*** Warning: no boot file name; using '%s'\n",
 896                        nfs_path);
 897         }
 898
 899         nfs_filename = basename(nfs_path);
 900         nfs_path     = dirname(nfs_path);
 901
 902         printf("Using %s device\n", eth_get_name());
 903
 904         printf("File transfer via NFS from server %pI4; our IP address is %pI4",
 905                &nfs_server_ip, &net_ip);
 906
 907         /* Check if we need to send across this subnet */
 908         if (net_gateway.s_addr && net_netmask.s_addr) {
 909                 struct in_addr our_net;
 910                 struct in_addr server_net;
 911
 912                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 913                 server_net.s_addr = nfs_server_ip.s_addr & net_netmask.s_addr;
 914                 if (our_net.s_addr != server_net.s_addr)
 915                         printf("; sending through gateway %pI4",
 916                                &net_gateway);
 917         }
 918         printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 919
 920         if (net_boot_file_expected_size_in_blocks) {
 921                 printf(" Size is 0x%x Bytes = ",
 922                        net_boot_file_expected_size_in_blocks << 9);
 923                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 924         }
 925         printf("\nLoad address: 0x%lx\nLoading: *\b", image_load_addr);
 926
 927         net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 928         net_set_udp_handler(nfs_handler);
 929
 930         nfs_timeout_count = 0;
 931         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 932
 933         /*nfs_our_port = 4096 + (get_ticks() % 3072);*/
 934         /*FIX ME !!!*/
 935         nfs_our_port = 1000;
 936
 937         /* zero out server ether in case the server ip has changed */
 938         memset(net_server_ethaddr, 0, 6);
 939
 940         nfs_send();
 941 }