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 /* 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 /* NOTE 5: NFSv1 support added by Christian Gmeiner, Thomas Rienoessl,
  30  * September 27, 2018. As of now, NFSv3 is the default choice. If the server
  31  * does not support NFSv3, we fall back to versions 2 or 1. */
  32
  33 #include <common.h>
  34 #include <command.h>
  35 #include <display_options.h>
  36 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  37 #include <flash.h>
  38 #endif
  39 #include <image.h>
  40 #include <log.h>
  41 #include <net.h>
  42 #include <malloc.h>
  43 #include <mapmem.h>
  44 #include "nfs.h"
  45 #include "bootp.h"
  46 #include <time.h>
  47
  48 #define HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  49 #define NFS_RETRY_COUNT 30
  50
  51 #define NFS_RPC_ERR     1
  52 #define NFS_RPC_DROP    124
  53
  54 static int fs_mounted;
  55 static unsigned long rpc_id;
  56 static int nfs_offset = -1;
  57 static int nfs_len;
  58 static const ulong nfs_timeout = CONFIG_NFS_TIMEOUT;
  59
  60 static char dirfh[NFS_FHSIZE];  /* NFSv2 / NFSv3 file handle of directory */
  61 static char filefh[NFS3_FHSIZE]; /* NFSv2 / NFSv3 file handle */
  62 static unsigned int filefh3_length;     /* (variable) length of filefh when NFSv3 */
  63
  64 static enum net_loop_state nfs_download_state;
  65 static struct in_addr nfs_server_ip;
  66 static int nfs_server_mount_port;
  67 static int nfs_server_port;
  68 static int nfs_our_port;
  69 static int nfs_timeout_count;
  70 static int nfs_state;
  71 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  72 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  73 #define STATE_MOUNT_REQ                 3
  74 #define STATE_UMOUNT_REQ                4
  75 #define STATE_LOOKUP_REQ                5
  76 #define STATE_READ_REQ                  6
  77 #define STATE_READLINK_REQ              7
  78
  79 static char *nfs_filename;
  80 static char *nfs_path;
  81 static char nfs_path_buff[2048];
  82
  83 enum nfs_version {
  84         NFS_UNKOWN = 0,
  85         NFS_V1 = 1,
  86         NFS_V2 = 2,
  87         NFS_V3 = 3,
  88 };
  89
  90 static enum nfs_version choosen_nfs_version = NFS_V3;
  91 static inline int store_block(uchar *src, unsigned offset, unsigned len)
  92 {
  93         ulong newsize = offset + len;
  94 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  95         int i, rc = 0;
  96
  97         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  98                 /* start address in flash? */
  99                 if (image_load_addr + offset >= flash_info[i].start[0]) {
 100                         rc = 1;
 101                         break;
 102                 }
 103         }
 104
 105         if (rc) { /* Flash is destination for this packet */
 106                 rc = flash_write((uchar *)src, (ulong)image_load_addr + offset,
 107                                  len);
 108                 if (rc) {
 109                         flash_perror(rc);
 110                         return -1;
 111                 }
 112         } else
 113 #endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
 114         {
 115                 void *ptr = map_sysmem(image_load_addr + offset, len);
 116
 117                 memcpy(ptr, src, len);
 118                 unmap_sysmem(ptr);
 119         }
 120
 121         if (net_boot_file_size < (offset + len))
 122                 net_boot_file_size = newsize;
 123         return 0;
 124 }
 125
 126 static char *basename(char *path)
 127 {
 128         char *fname;
 129
 130         fname = path + strlen(path) - 1;
 131         while (fname >= path) {
 132                 if (*fname == '/') {
 133                         fname++;
 134                         break;
 135                 }
 136                 fname--;
 137         }
 138         return fname;
 139 }
 140
 141 static char *dirname(char *path)
 142 {
 143         char *fname;
 144
 145         fname = basename(path);
 146         --fname;
 147         *fname = '\0';
 148         return path;
 149 }
 150
 151 /**************************************************************************
 152 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 153 **************************************************************************/
 154 static uint32_t *rpc_add_credentials(uint32_t *p)
 155 {
 156         /* Here's the executive summary on authentication requirements of the
 157          * various NFS server implementations:  Linux accepts both AUTH_NONE
 158          * and AUTH_UNIX authentication (also accepts an empty hostname field
 159          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 160          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 161          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 162          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 163          * hostname).  */
 164
 165         /* Provide an AUTH_UNIX credential.  */
 166         *p++ = htonl(1);                /* AUTH_UNIX */
 167         *p++ = htonl(20);               /* auth length */
 168         *p++ = 0;                       /* stamp */
 169         *p++ = 0;                       /* hostname string */
 170         *p++ = 0;                       /* uid */
 171         *p++ = 0;                       /* gid */
 172         *p++ = 0;                       /* auxiliary gid list */
 173
 174         /* Provide an AUTH_NONE verifier.  */
 175         *p++ = 0;                       /* AUTH_NONE */
 176         *p++ = 0;                       /* auth length */
 177
 178         return p;
 179 }
 180
 181 /**************************************************************************
 182 RPC_LOOKUP - Lookup RPC Port numbers
 183 **************************************************************************/
 184 static void rpc_req(int rpc_prog, int rpc_proc, uint32_t *data, int datalen)
 185 {
 186         struct rpc_t rpc_pkt;
 187         unsigned long id;
 188         uint32_t *p;
 189         int pktlen;
 190         int sport;
 191
 192         id = ++rpc_id;
 193         rpc_pkt.u.call.id = htonl(id);
 194         rpc_pkt.u.call.type = htonl(MSG_CALL);
 195         rpc_pkt.u.call.rpcvers = htonl(2);      /* use RPC version 2 */
 196         rpc_pkt.u.call.prog = htonl(rpc_prog);
 197         switch (rpc_prog) {
 198         case PROG_NFS:
 199                 switch (choosen_nfs_version) {
 200                 case NFS_V1:
 201                 case NFS_V2:
 202                         rpc_pkt.u.call.vers = htonl(2);
 203                         break;
 204
 205                 case NFS_V3:
 206                         rpc_pkt.u.call.vers = htonl(3);
 207                         break;
 208
 209                 case NFS_UNKOWN:
 210                         /* nothing to do */
 211                         break;
 212                 }
 213                 break;
 214         case PROG_MOUNT:
 215                 switch (choosen_nfs_version) {
 216                 case NFS_V1:
 217                         rpc_pkt.u.call.vers = htonl(1);
 218                         break;
 219
 220                 case NFS_V2:
 221                         rpc_pkt.u.call.vers = htonl(2);
 222                         break;
 223
 224                 case NFS_V3:
 225                         rpc_pkt.u.call.vers = htonl(3);
 226                         break;
 227
 228                 case NFS_UNKOWN:
 229                         /* nothing to do */
 230                         break;
 231                 }
 232                 break;
 233         case PROG_PORTMAP:
 234         default:
 235                 rpc_pkt.u.call.vers = htonl(2); /* portmapper is version 2 */
 236         }
 237         rpc_pkt.u.call.proc = htonl(rpc_proc);
 238         p = rpc_pkt.u.call.data;
 239
 240         if (datalen)
 241                 memcpy(p, data, datalen * sizeof(uint32_t));
 242
 243         pktlen = (char *)p + datalen * sizeof(uint32_t) - (char *)&rpc_pkt;
 244
 245         memcpy((char *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE,
 246                &rpc_pkt.u.data[0], pktlen);
 247
 248         if (rpc_prog == PROG_PORTMAP)
 249                 sport = SUNRPC_PORT;
 250         else if (rpc_prog == PROG_MOUNT)
 251                 sport = nfs_server_mount_port;
 252         else
 253                 sport = nfs_server_port;
 254
 255         net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
 256                             nfs_our_port, pktlen);
 257 }
 258
 259 /**************************************************************************
 260 RPC_LOOKUP - Lookup RPC Port numbers
 261 **************************************************************************/
 262 static void rpc_lookup_req(int prog, int ver)
 263 {
 264         uint32_t data[16];
 265
 266         data[0] = 0; data[1] = 0;       /* auth credential */
 267         data[2] = 0; data[3] = 0;       /* auth verifier */
 268         data[4] = htonl(prog);
 269         data[5] = htonl(ver);
 270         data[6] = htonl(17);    /* IP_UDP */
 271         data[7] = 0;
 272         rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, data, 8);
 273 }
 274
 275 /**************************************************************************
 276 NFS_MOUNT - Mount an NFS Filesystem
 277 **************************************************************************/
 278 static void nfs_mount_req(char *path)
 279 {
 280         uint32_t data[1024];
 281         uint32_t *p;
 282         int len;
 283         int pathlen;
 284
 285         pathlen = strlen(path);
 286
 287         p = &(data[0]);
 288         p = rpc_add_credentials(p);
 289
 290         *p++ = htonl(pathlen);
 291         if (pathlen & 3)
 292                 *(p + pathlen / 4) = 0;
 293         memcpy(p, path, pathlen);
 294         p += (pathlen + 3) / 4;
 295
 296         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 297
 298         rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, data, len);
 299 }
 300
 301 /**************************************************************************
 302 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 303 **************************************************************************/
 304 static void nfs_umountall_req(void)
 305 {
 306         uint32_t data[1024];
 307         uint32_t *p;
 308         int len;
 309
 310         if ((nfs_server_mount_port == -1) || (!fs_mounted))
 311                 /* Nothing mounted, nothing to umount */
 312                 return;
 313
 314         p = &(data[0]);
 315         p = rpc_add_credentials(p);
 316
 317         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 318
 319         rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, data, len);
 320 }
 321
 322 /***************************************************************************
 323  * NFS_READLINK (AH 2003-07-14)
 324  * This procedure is called when read of the first block fails -
 325  * this probably happens when it's a directory or a symlink
 326  * In case of successful readlink(), the dirname is manipulated,
 327  * so that inside the nfs() function a recursion can be done.
 328  **************************************************************************/
 329 static void nfs_readlink_req(void)
 330 {
 331         uint32_t data[1024];
 332         uint32_t *p;
 333         int len;
 334
 335         p = &(data[0]);
 336         p = rpc_add_credentials(p);
 337
 338         if (choosen_nfs_version != NFS_V3) {
 339                 memcpy(p, filefh, NFS_FHSIZE);
 340                 p += (NFS_FHSIZE / 4);
 341         } else { /* NFS_V3 */
 342                 *p++ = htonl(filefh3_length);
 343                 memcpy(p, filefh, filefh3_length);
 344                 p += (filefh3_length / 4);
 345         }
 346
 347         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 348
 349         rpc_req(PROG_NFS, NFS_READLINK, data, len);
 350 }
 351
 352 /**************************************************************************
 353 NFS_LOOKUP - Lookup Pathname
 354 **************************************************************************/
 355 static void nfs_lookup_req(char *fname)
 356 {
 357         uint32_t data[1024];
 358         uint32_t *p;
 359         int len;
 360         int fnamelen;
 361
 362         fnamelen = strlen(fname);
 363
 364         p = &(data[0]);
 365         p = rpc_add_credentials(p);
 366
 367         if (choosen_nfs_version != NFS_V3) {
 368                 memcpy(p, dirfh, NFS_FHSIZE);
 369                 p += (NFS_FHSIZE / 4);
 370                 *p++ = htonl(fnamelen);
 371                 if (fnamelen & 3)
 372                         *(p + fnamelen / 4) = 0;
 373                 memcpy(p, fname, fnamelen);
 374                 p += (fnamelen + 3) / 4;
 375
 376                 len = (uint32_t *)p - (uint32_t *)&(data[0]);
 377
 378                 rpc_req(PROG_NFS, NFS_LOOKUP, data, len);
 379         } else {  /* NFS_V3 */
 380                 *p++ = htonl(NFS_FHSIZE);       /* Dir handle length */
 381                 memcpy(p, dirfh, NFS_FHSIZE);
 382                 p += (NFS_FHSIZE / 4);
 383                 *p++ = htonl(fnamelen);
 384                 if (fnamelen & 3)
 385                         *(p + fnamelen / 4) = 0;
 386                 memcpy(p, fname, fnamelen);
 387                 p += (fnamelen + 3) / 4;
 388
 389                 len = (uint32_t *)p - (uint32_t *)&(data[0]);
 390
 391                 rpc_req(PROG_NFS, NFS3PROC_LOOKUP, data, len);
 392         }
 393 }
 394
 395 /**************************************************************************
 396 NFS_READ - Read File on NFS Server
 397 **************************************************************************/
 398 static void nfs_read_req(int offset, int readlen)
 399 {
 400         uint32_t data[1024];
 401         uint32_t *p;
 402         int len;
 403
 404         p = &(data[0]);
 405         p = rpc_add_credentials(p);
 406
 407         if (choosen_nfs_version != NFS_V3) {
 408                 memcpy(p, filefh, NFS_FHSIZE);
 409                 p += (NFS_FHSIZE / 4);
 410                 *p++ = htonl(offset);
 411                 *p++ = htonl(readlen);
 412                 *p++ = 0;
 413         } else { /* NFS_V3 */
 414                 *p++ = htonl(filefh3_length);
 415                 memcpy(p, filefh, filefh3_length);
 416                 p += (filefh3_length / 4);
 417                 *p++ = htonl(0); /* offset is 64-bit long, so fill with 0 */
 418                 *p++ = htonl(offset);
 419                 *p++ = htonl(readlen);
 420                 *p++ = 0;
 421         }
 422
 423         len = (uint32_t *)p - (uint32_t *)&(data[0]);
 424
 425         rpc_req(PROG_NFS, NFS_READ, data, len);
 426 }
 427
 428 /**************************************************************************
 429 RPC request dispatcher
 430 **************************************************************************/
 431 static void nfs_send(void)
 432 {
 433         debug("%s\n", __func__);
 434
 435         switch (nfs_state) {
 436         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 437                 if (choosen_nfs_version != NFS_V3)
 438                         rpc_lookup_req(PROG_MOUNT, 1);
 439                 else  /* NFS_V3 */
 440                         rpc_lookup_req(PROG_MOUNT, 3);
 441                 break;
 442         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 443                 if (choosen_nfs_version != NFS_V3)
 444                         rpc_lookup_req(PROG_NFS, 2);
 445                 else  /* NFS_V3 */
 446                         rpc_lookup_req(PROG_NFS, 3);
 447                 break;
 448         case STATE_MOUNT_REQ:
 449                 nfs_mount_req(nfs_path);
 450                 break;
 451         case STATE_UMOUNT_REQ:
 452                 nfs_umountall_req();
 453                 break;
 454         case STATE_LOOKUP_REQ:
 455                 nfs_lookup_req(nfs_filename);
 456                 break;
 457         case STATE_READ_REQ:
 458                 nfs_read_req(nfs_offset, nfs_len);
 459                 break;
 460         case STATE_READLINK_REQ:
 461                 nfs_readlink_req();
 462                 break;
 463         }
 464 }
 465
 466 /**************************************************************************
 467 Handlers for the reply from server
 468 **************************************************************************/
 469
 470 static int rpc_handle_error(struct rpc_t *rpc_pkt)
 471 {
 472         if (rpc_pkt->u.reply.rstatus  ||
 473             rpc_pkt->u.reply.verifier ||
 474             rpc_pkt->u.reply.astatus  ||
 475             rpc_pkt->u.reply.data[0]) {
 476                 switch (ntohl(rpc_pkt->u.reply.astatus)) {
 477                 case NFS_RPC_SUCCESS: /* Not an error */
 478                         break;
 479                 case NFS_RPC_PROG_MISMATCH: {
 480                         /* Remote can't support NFS version */
 481                         const int min = ntohl(rpc_pkt->u.reply.data[0]);
 482                         const int max = ntohl(rpc_pkt->u.reply.data[1]);
 483
 484                         if (max < NFS_V1 || max > NFS_V3 || min > NFS_V3) {
 485                                 puts("*** ERROR: NFS version not supported");
 486                                 debug(": Requested: V%d, accepted: min V%d - max V%d\n",
 487                                       choosen_nfs_version,
 488                                       ntohl(rpc_pkt->u.reply.data[0]),
 489                                       ntohl(rpc_pkt->u.reply.data[1]));
 490                                 puts("\n");
 491                                 choosen_nfs_version = NFS_UNKOWN;
 492                                 break;
 493                         }
 494
 495                         debug("*** Warning: NFS version not supported: Requested: V%d, accepted: min V%d - max V%d\n",
 496                               choosen_nfs_version,
 497                               ntohl(rpc_pkt->u.reply.data[0]),
 498                               ntohl(rpc_pkt->u.reply.data[1]));
 499                         debug("Will retry with NFSv%d\n", min);
 500                         choosen_nfs_version = min;
 501                         return -NFS_RPC_PROG_MISMATCH;
 502                 }
 503                 case NFS_RPC_PROG_UNAVAIL:
 504                 case NFS_RPC_PROC_UNAVAIL:
 505                 case NFS_RPC_GARBAGE_ARGS:
 506                 case NFS_RPC_SYSTEM_ERR:
 507                 default: /* Unknown error on 'accept state' flag */
 508                         debug("*** ERROR: accept state error (%d)\n",
 509                               ntohl(rpc_pkt->u.reply.astatus));
 510                         break;
 511                 }
 512                 return -1;
 513         }
 514
 515         return 0;
 516 }
 517
 518 static int rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
 519 {
 520         struct rpc_t rpc_pkt;
 521
 522         memcpy(&rpc_pkt.u.data[0], pkt, len);
 523
 524         debug("%s\n", __func__);
 525
 526         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 527                 return -NFS_RPC_ERR;
 528         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 529                 return -NFS_RPC_DROP;
 530
 531         if (rpc_pkt.u.reply.rstatus  ||
 532             rpc_pkt.u.reply.verifier ||
 533             rpc_pkt.u.reply.astatus)
 534                 return -1;
 535
 536         switch (prog) {
 537         case PROG_MOUNT:
 538                 nfs_server_mount_port = ntohl(rpc_pkt.u.reply.data[0]);
 539                 break;
 540         case PROG_NFS:
 541                 nfs_server_port = ntohl(rpc_pkt.u.reply.data[0]);
 542                 break;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int nfs_mount_reply(uchar *pkt, unsigned len)
 549 {
 550         struct rpc_t rpc_pkt;
 551         int ret;
 552
 553         debug("%s\n", __func__);
 554
 555         memcpy(&rpc_pkt.u.data[0], pkt, len);
 556
 557         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 558                 return -NFS_RPC_ERR;
 559         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 560                 return -NFS_RPC_DROP;
 561
 562         ret = rpc_handle_error(&rpc_pkt);
 563         if (ret)
 564                 return ret;
 565
 566         fs_mounted = 1;
 567         /*  NFSv2 and NFSv3 use same structure */
 568         memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 569
 570         return 0;
 571 }
 572
 573 static int nfs_umountall_reply(uchar *pkt, unsigned len)
 574 {
 575         struct rpc_t rpc_pkt;
 576
 577         debug("%s\n", __func__);
 578
 579         memcpy(&rpc_pkt.u.data[0], pkt, len);
 580
 581         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 582                 return -NFS_RPC_ERR;
 583         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 584                 return -NFS_RPC_DROP;
 585
 586         if (rpc_pkt.u.reply.rstatus  ||
 587             rpc_pkt.u.reply.verifier ||
 588             rpc_pkt.u.reply.astatus)
 589                 return -1;
 590
 591         fs_mounted = 0;
 592         memset(dirfh, 0, sizeof(dirfh));
 593
 594         return 0;
 595 }
 596
 597 static int nfs_lookup_reply(uchar *pkt, unsigned len)
 598 {
 599         struct rpc_t rpc_pkt;
 600         int ret;
 601
 602         debug("%s\n", __func__);
 603
 604         memcpy(&rpc_pkt.u.data[0], pkt, len);
 605
 606         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 607                 return -NFS_RPC_ERR;
 608         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 609                 return -NFS_RPC_DROP;
 610
 611         ret = rpc_handle_error(&rpc_pkt);
 612         if (ret)
 613                 return ret;
 614
 615         if (choosen_nfs_version != NFS_V3) {
 616                 if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + NFS_FHSIZE) > len)
 617                         return -NFS_RPC_DROP;
 618                 memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 619         } else {  /* NFS_V3 */
 620                 filefh3_length = ntohl(rpc_pkt.u.reply.data[1]);
 621                 if (filefh3_length > NFS3_FHSIZE)
 622                         filefh3_length  = NFS3_FHSIZE;
 623                 memcpy(filefh, rpc_pkt.u.reply.data + 2, filefh3_length);
 624         }
 625
 626         return 0;
 627 }
 628
 629 static int nfs3_get_attributes_offset(uint32_t *data)
 630 {
 631         if (data[1]) {
 632                 /* 'attributes_follow' flag is TRUE,
 633                  * so we have attributes on 21 dwords */
 634                 /* Skip unused values :
 635                         type;   32 bits value,
 636                         mode;   32 bits value,
 637                         nlink;  32 bits value,
 638                         uid;    32 bits value,
 639                         gid;    32 bits value,
 640                         size;   64 bits value,
 641                         used;   64 bits value,
 642                         rdev;   64 bits value,
 643                         fsid;   64 bits value,
 644                         fileid; 64 bits value,
 645                         atime;  64 bits value,
 646                         mtime;  64 bits value,
 647                         ctime;  64 bits value,
 648                 */
 649                 return 22;
 650         } else {
 651                 /* 'attributes_follow' flag is FALSE,
 652                  * so we don't have any attributes */
 653                 return 1;
 654         }
 655 }
 656
 657 static int nfs_readlink_reply(uchar *pkt, unsigned len)
 658 {
 659         struct rpc_t rpc_pkt;
 660         int rlen;
 661         int nfsv3_data_offset = 0;
 662
 663         debug("%s\n", __func__);
 664
 665         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 666
 667         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 668                 return -NFS_RPC_ERR;
 669         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 670                 return -NFS_RPC_DROP;
 671
 672         if (rpc_pkt.u.reply.rstatus  ||
 673             rpc_pkt.u.reply.verifier ||
 674             rpc_pkt.u.reply.astatus  ||
 675             rpc_pkt.u.reply.data[0])
 676                 return -1;
 677
 678         if (choosen_nfs_version == NFS_V3) {
 679                 nfsv3_data_offset =
 680                         nfs3_get_attributes_offset(rpc_pkt.u.reply.data);
 681         }
 682
 683         /* new path length */
 684         rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]);
 685
 686         if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + rlen) > len)
 687                 return -NFS_RPC_DROP;
 688
 689         if (*((char *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset])) != '/') {
 690                 int pathlen;
 691
 692                 strcat(nfs_path, "/");
 693                 pathlen = strlen(nfs_path);
 694                 memcpy(nfs_path + pathlen,
 695                        (uchar *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset]),
 696                        rlen);
 697                 nfs_path[pathlen + rlen] = 0;
 698         } else {
 699                 memcpy(nfs_path,
 700                        (uchar *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset]),
 701                        rlen);
 702                 nfs_path[rlen] = 0;
 703         }
 704         return 0;
 705 }
 706
 707 static int nfs_read_reply(uchar *pkt, unsigned len)
 708 {
 709         struct rpc_t rpc_pkt;
 710         int rlen;
 711         uchar *data_ptr;
 712
 713         debug("%s\n", __func__);
 714
 715         memcpy(&rpc_pkt.u.data[0], pkt, sizeof(rpc_pkt.u.reply));
 716
 717         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 718                 return -NFS_RPC_ERR;
 719         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 720                 return -NFS_RPC_DROP;
 721
 722         if (rpc_pkt.u.reply.rstatus  ||
 723             rpc_pkt.u.reply.verifier ||
 724             rpc_pkt.u.reply.astatus  ||
 725             rpc_pkt.u.reply.data[0]) {
 726                 if (rpc_pkt.u.reply.rstatus)
 727                         return -9999;
 728                 if (rpc_pkt.u.reply.astatus)
 729                         return -9999;
 730                 return -ntohl(rpc_pkt.u.reply.data[0]);
 731         }
 732
 733         if ((nfs_offset != 0) && !((nfs_offset) %
 734                         (NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
 735                 puts("\n\t ");
 736         if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
 737                 putc('#');
 738
 739         if (choosen_nfs_version != NFS_V3) {
 740                 rlen = ntohl(rpc_pkt.u.reply.data[18]);
 741                 data_ptr = (uchar *)&(rpc_pkt.u.reply.data[19]);
 742         } else {  /* NFS_V3 */
 743                 int nfsv3_data_offset =
 744                         nfs3_get_attributes_offset(rpc_pkt.u.reply.data);
 745
 746                 /* count value */
 747                 rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]);
 748                 /* Skip unused values :
 749                         EOF:            32 bits value,
 750                         data_size:      32 bits value,
 751                 */
 752                 data_ptr = (uchar *)
 753                         &(rpc_pkt.u.reply.data[4 + nfsv3_data_offset]);
 754         }
 755
 756         if (((uchar *)&(rpc_pkt.u.reply.data[0]) - (uchar *)(&rpc_pkt) + rlen) > len)
 757                         return -9999;
 758
 759         if (store_block(data_ptr, nfs_offset, rlen))
 760                         return -9999;
 761
 762         return rlen;
 763 }
 764
 765 /**************************************************************************
 766 Interfaces of U-BOOT
 767 **************************************************************************/
 768 static void nfs_timeout_handler(void)
 769 {
 770         if (++nfs_timeout_count > NFS_RETRY_COUNT) {
 771                 puts("\nRetry count exceeded; starting again\n");
 772                 net_start_again();
 773         } else {
 774                 puts("T ");
 775                 net_set_timeout_handler(nfs_timeout +
 776                                         nfs_timeout * nfs_timeout_count,
 777                                         nfs_timeout_handler);
 778                 nfs_send();
 779         }
 780 }
 781
 782 static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 783                         unsigned src, unsigned len)
 784 {
 785         int rlen;
 786         int reply;
 787
 788         debug("%s\n", __func__);
 789
 790         if (len > sizeof(struct rpc_t))
 791                 return;
 792
 793         if (dest != nfs_our_port)
 794                 return;
 795
 796         switch (nfs_state) {
 797         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 798                 if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
 799                         break;
 800                 nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
 801                 nfs_send();
 802                 break;
 803
 804         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 805                 if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
 806                         break;
 807                 nfs_state = STATE_MOUNT_REQ;
 808                 nfs_send();
 809                 break;
 810
 811         case STATE_MOUNT_REQ:
 812                 reply = nfs_mount_reply(pkt, len);
 813                 if (reply == -NFS_RPC_DROP) {
 814                         break;
 815                 } else if (reply == -NFS_RPC_ERR) {
 816                         puts("*** ERROR: Cannot mount\n");
 817                         /* just to be sure... */
 818                         nfs_state = STATE_UMOUNT_REQ;
 819                         nfs_send();
 820                 } else if (reply == -NFS_RPC_PROG_MISMATCH &&
 821                            choosen_nfs_version != NFS_UNKOWN) {
 822                         nfs_state = STATE_MOUNT_REQ;
 823                         nfs_send();
 824                 } else {
 825                         nfs_state = STATE_LOOKUP_REQ;
 826                         nfs_send();
 827                 }
 828                 break;
 829
 830         case STATE_UMOUNT_REQ:
 831                 reply = nfs_umountall_reply(pkt, len);
 832                 if (reply == -NFS_RPC_DROP) {
 833                         break;
 834                 } else if (reply == -NFS_RPC_ERR) {
 835                         debug("*** ERROR: Cannot umount\n");
 836                         net_set_state(NETLOOP_FAIL);
 837                 } else {
 838                         puts("\ndone\n");
 839                         net_set_state(nfs_download_state);
 840                 }
 841                 break;
 842
 843         case STATE_LOOKUP_REQ:
 844                 reply = nfs_lookup_reply(pkt, len);
 845                 if (reply == -NFS_RPC_DROP) {
 846                         break;
 847                 } else if (reply == -NFS_RPC_ERR) {
 848                         puts("*** ERROR: File lookup fail\n");
 849                         nfs_state = STATE_UMOUNT_REQ;
 850                         nfs_send();
 851                 } else if (reply == -NFS_RPC_PROG_MISMATCH &&
 852                            choosen_nfs_version != NFS_UNKOWN) {
 853                         /* umount */
 854                         nfs_state = STATE_UMOUNT_REQ;
 855                         nfs_send();
 856                         /* And retry with another supported version */
 857                         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 858                         nfs_send();
 859                 } else {
 860                         nfs_state = STATE_READ_REQ;
 861                         nfs_offset = 0;
 862                         nfs_len = NFS_READ_SIZE;
 863                         nfs_send();
 864                 }
 865                 break;
 866
 867         case STATE_READLINK_REQ:
 868                 reply = nfs_readlink_reply(pkt, len);
 869                 if (reply == -NFS_RPC_DROP) {
 870                         break;
 871                 } else if (reply == -NFS_RPC_ERR) {
 872                         puts("*** ERROR: Symlink fail\n");
 873                         nfs_state = STATE_UMOUNT_REQ;
 874                         nfs_send();
 875                 } else {
 876                         debug("Symlink --> %s\n", nfs_path);
 877                         nfs_filename = basename(nfs_path);
 878                         nfs_path     = dirname(nfs_path);
 879
 880                         nfs_state = STATE_MOUNT_REQ;
 881                         nfs_send();
 882                 }
 883                 break;
 884
 885         case STATE_READ_REQ:
 886                 rlen = nfs_read_reply(pkt, len);
 887                 if (rlen == -NFS_RPC_DROP)
 888                         break;
 889                 net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 890                 if (rlen > 0) {
 891                         nfs_offset += rlen;
 892                         nfs_send();
 893                 } else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
 894                         /* symbolic link */
 895                         nfs_state = STATE_READLINK_REQ;
 896                         nfs_send();
 897                 } else {
 898                         if (!rlen)
 899                                 nfs_download_state = NETLOOP_SUCCESS;
 900                         if (rlen < 0)
 901                                 debug("NFS READ error (%d)\n", rlen);
 902                         nfs_state = STATE_UMOUNT_REQ;
 903                         nfs_send();
 904                 }
 905                 break;
 906         }
 907 }
 908
 909
 910 void nfs_start(void)
 911 {
 912         debug("%s\n", __func__);
 913         nfs_download_state = NETLOOP_FAIL;
 914
 915         nfs_server_ip = net_server_ip;
 916         nfs_path = (char *)nfs_path_buff;
 917
 918         if (nfs_path == NULL) {
 919                 net_set_state(NETLOOP_FAIL);
 920                 printf("*** ERROR: Fail allocate memory\n");
 921                 return;
 922         }
 923
 924         if (!net_parse_bootfile(&nfs_server_ip, nfs_path,
 925                                 sizeof(nfs_path_buff))) {
 926                 sprintf(nfs_path, "/nfsroot/%02X%02X%02X%02X.img",
 927                         net_ip.s_addr & 0xFF,
 928                         (net_ip.s_addr >>  8) & 0xFF,
 929                         (net_ip.s_addr >> 16) & 0xFF,
 930                         (net_ip.s_addr >> 24) & 0xFF);
 931
 932                 printf("*** Warning: no boot file name; using '%s'\n",
 933                        nfs_path);
 934         }
 935
 936         nfs_filename = basename(nfs_path);
 937         nfs_path     = dirname(nfs_path);
 938
 939         printf("Using %s device\n", eth_get_name());
 940
 941         printf("File transfer via NFS from server %pI4; our IP address is %pI4",
 942                &nfs_server_ip, &net_ip);
 943
 944         /* Check if we need to send across this subnet */
 945         if (net_gateway.s_addr && net_netmask.s_addr) {
 946                 struct in_addr our_net;
 947                 struct in_addr server_net;
 948
 949                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 950                 server_net.s_addr = nfs_server_ip.s_addr & net_netmask.s_addr;
 951                 if (our_net.s_addr != server_net.s_addr)
 952                         printf("; sending through gateway %pI4",
 953                                &net_gateway);
 954         }
 955         printf("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 956
 957         if (net_boot_file_expected_size_in_blocks) {
 958                 printf(" Size is 0x%x Bytes = ",
 959                        net_boot_file_expected_size_in_blocks << 9);
 960                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 961         }
 962         printf("\nLoad address: 0x%lx\nLoading: *\b", image_load_addr);
 963
 964         net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 965         net_set_udp_handler(nfs_handler);
 966
 967         nfs_timeout_count = 0;
 968         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 969
 970         /*nfs_our_port = 4096 + (get_ticks() % 3072);*/
 971         /*FIX ME !!!*/
 972         nfs_our_port = 1000;
 973
 974         /* zero out server ether in case the server ip has changed */
 975         memset(net_server_ethaddr, 0, 6);
 976
 977         nfs_send();
 978 }