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 #include <common.h>
  30 #include <command.h>
  31 #include <net.h>
  32 #include <malloc.h>
  33 #include <mapmem.h>
  34 #include "nfs.h"
  35 #include "bootp.h"
  36
  37 #define HASHES_PER_LINE 65      /* Number of "loading" hashes per line  */
  38 #define NFS_RETRY_COUNT 30
  39 #ifndef CONFIG_NFS_TIMEOUT
  40 # define NFS_TIMEOUT 2000UL
  41 #else
  42 # define NFS_TIMEOUT CONFIG_NFS_TIMEOUT
  43 #endif
  44
  45 #define NFS_RPC_ERR     1
  46 #define NFS_RPC_DROP    124
  47
  48 static int fs_mounted;
  49 static unsigned long rpc_id;
  50 static int nfs_offset = -1;
  51 static int nfs_len;
  52 static ulong nfs_timeout = NFS_TIMEOUT;
  53
  54 static char dirfh[NFS_FHSIZE];  /* NFSv2 / NFSv3 file handle of directory */
  55 static char filefh[NFS3_FHSIZE]; /* NFSv2 / NFSv3 file handle */
  56 static int filefh3_length;      /* (variable) length of filefh when NFSv3 */
  57
  58 static enum net_loop_state nfs_download_state;
  59 static struct in_addr nfs_server_ip;
  60 static int nfs_server_mount_port;
  61 static int nfs_server_port;
  62 static int nfs_our_port;
  63 static int nfs_timeout_count;
  64 static int nfs_state;
  65 #define STATE_PRCLOOKUP_PROG_MOUNT_REQ  1
  66 #define STATE_PRCLOOKUP_PROG_NFS_REQ    2
  67 #define STATE_MOUNT_REQ                 3
  68 #define STATE_UMOUNT_REQ                4
  69 #define STATE_LOOKUP_REQ                5
  70 #define STATE_READ_REQ                  6
  71 #define STATE_READLINK_REQ              7
  72
  73 static char *nfs_filename;
  74 static char *nfs_path;
  75 static char nfs_path_buff[2048];
  76
  77 #define NFSV2_FLAG 1
  78 #define NFSV3_FLAG 1 << 1
  79 static char supported_nfs_versions = NFSV2_FLAG | NFSV3_FLAG;
  80
  81 static inline int store_block(uchar *src, unsigned offset, unsigned len)
  82 {
  83         ulong newsize = offset + len;
  84 #ifdef CONFIG_SYS_DIRECT_FLASH_NFS
  85         int i, rc = 0;
  86
  87         for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
  88                 /* start address in flash? */
  89                 if (load_addr + offset >= flash_info[i].start[0]) {
  90                         rc = 1;
  91                         break;
  92                 }
  93         }
  94
  95         if (rc) { /* Flash is destination for this packet */
  96                 rc = flash_write((uchar *)src, (ulong)(load_addr+offset), len);
  97                 if (rc) {
  98                         flash_perror(rc);
  99                         return -1;
 100                 }
 101         } else
 102 #endif /* CONFIG_SYS_DIRECT_FLASH_NFS */
 103         {
 104                 void *ptr = map_sysmem(load_addr + offset, len);
 105
 106                 memcpy(ptr, src, len);
 107                 unmap_sysmem(ptr);
 108         }
 109
 110         if (net_boot_file_size < (offset + len))
 111                 net_boot_file_size = newsize;
 112         return 0;
 113 }
 114
 115 static char *basename(char *path)
 116 {
 117         char *fname;
 118
 119         fname = path + strlen(path) - 1;
 120         while (fname >= path) {
 121                 if (*fname == '/') {
 122                         fname++;
 123                         break;
 124                 }
 125                 fname--;
 126         }
 127         return fname;
 128 }
 129
 130 static char *dirname(char *path)
 131 {
 132         char *fname;
 133
 134         fname = basename(path);
 135         --fname;
 136         *fname = '\0';
 137         return path;
 138 }
 139
 140 /**************************************************************************
 141 RPC_ADD_CREDENTIALS - Add RPC authentication/verifier entries
 142 **************************************************************************/
 143 static uint32_t *rpc_add_credentials(uint32_t *p)
 144 {
 145         /* Here's the executive summary on authentication requirements of the
 146          * various NFS server implementations:  Linux accepts both AUTH_NONE
 147          * and AUTH_UNIX authentication (also accepts an empty hostname field
 148          * in the AUTH_UNIX scheme).  *BSD refuses AUTH_NONE, but accepts
 149          * AUTH_UNIX (also accepts an empty hostname field in the AUTH_UNIX
 150          * scheme).  To be safe, use AUTH_UNIX and pass the hostname if we have
 151          * it (if the BOOTP/DHCP reply didn't give one, just use an empty
 152          * hostname).  */
 153
 154         /* Provide an AUTH_UNIX credential.  */
 155         *p++ = htonl(1);                /* AUTH_UNIX */
 156         *p++ = htonl(20);               /* auth length */
 157         *p++ = 0;                       /* stamp */
 158         *p++ = 0;                       /* hostname string */
 159         *p++ = 0;                       /* uid */
 160         *p++ = 0;                       /* gid */
 161         *p++ = 0;                       /* auxiliary gid list */
 162
 163         /* Provide an AUTH_NONE verifier.  */
 164         *p++ = 0;                       /* AUTH_NONE */
 165         *p++ = 0;                       /* auth length */
 166
 167         return p;
 168 }
 169
 170 /**************************************************************************
 171 RPC_LOOKUP - Lookup RPC Port numbers
 172 **************************************************************************/
 173 static struct rpc_t *rpc_req_prep(void)
 174 {
 175         return (struct rpc_t *)(net_tx_packet + net_eth_hdr_size() +
 176                                 IP_UDP_HDR_SIZE);
 177 }
 178
 179 static void rpc_req(int rpc_prog, int rpc_proc, struct rpc_t *rpc_pkt,
 180                     int datalen)
 181 {
 182         unsigned long id;
 183         int pktlen;
 184         int sport;
 185
 186         id = ++rpc_id;
 187         rpc_pkt->u.call.id = htonl(id);
 188         rpc_pkt->u.call.type = htonl(MSG_CALL);
 189         rpc_pkt->u.call.rpcvers = htonl(2);     /* use RPC version 2 */
 190         rpc_pkt->u.call.prog = htonl(rpc_prog);
 191         switch (rpc_prog) {
 192         case PROG_NFS:
 193                 if (supported_nfs_versions & NFSV2_FLAG)
 194                         rpc_pkt->u.call.vers = htonl(2);        /* NFS v2 */
 195                 else /* NFSV3_FLAG */
 196                         rpc_pkt->u.call.vers = htonl(3);        /* NFS v3 */
 197                 break;
 198         case PROG_PORTMAP:
 199         case PROG_MOUNT:
 200         default:
 201                 /* portmapper is version 2 */
 202                 rpc_pkt->u.call.vers = htonl(2);
 203         }
 204         rpc_pkt->u.call.proc = htonl(rpc_proc);
 205
 206         pktlen = ((char *)&rpc_pkt->u.call.data - (char *)&rpc_pkt) +
 207                 datalen * sizeof(uint32_t);
 208
 209         if (rpc_prog == PROG_PORTMAP)
 210                 sport = SUNRPC_PORT;
 211         else if (rpc_prog == PROG_MOUNT)
 212                 sport = nfs_server_mount_port;
 213         else
 214                 sport = nfs_server_port;
 215
 216         net_send_udp_packet(net_server_ethaddr, nfs_server_ip, sport,
 217                             nfs_our_port, pktlen);
 218 }
 219
 220 /**************************************************************************
 221 RPC_LOOKUP - Lookup RPC Port numbers
 222 **************************************************************************/
 223 static void rpc_lookup_req(int prog, int ver)
 224 {
 225         uint32_t *data;
 226         struct rpc_t *rpc_pkt = rpc_req_prep();
 227
 228         data = rpc_pkt->u.call.data;
 229         data[0] = 0; data[1] = 0;       /* auth credential */
 230         data[2] = 0; data[3] = 0;       /* auth verifier */
 231         data[4] = htonl(prog);
 232         data[5] = htonl(ver);
 233         data[6] = htonl(17);    /* IP_UDP */
 234         data[7] = 0;
 235         rpc_req(PROG_PORTMAP, PORTMAP_GETPORT, rpc_pkt, 8);
 236 }
 237
 238 /**************************************************************************
 239 NFS_MOUNT - Mount an NFS Filesystem
 240 **************************************************************************/
 241 static void nfs_mount_req(char *path)
 242 {
 243         uint32_t *p;
 244         int len;
 245         int pathlen;
 246         struct rpc_t *rpc_pkt = rpc_req_prep();
 247
 248         pathlen = strlen(path);
 249
 250         p = rpc_pkt->u.call.data;
 251         p = rpc_add_credentials(p);
 252
 253         *p++ = htonl(pathlen);
 254         if (pathlen & 3)
 255                 *(p + pathlen / 4) = 0;
 256         memcpy(p, path, pathlen);
 257         p += (pathlen + 3) / 4;
 258
 259         len = (uint32_t *)p - (uint32_t *)&(rpc_pkt->u.call.data);
 260
 261         rpc_req(PROG_MOUNT, MOUNT_ADDENTRY, rpc_pkt, len);
 262 }
 263
 264 /**************************************************************************
 265 NFS_UMOUNTALL - Unmount all our NFS Filesystems on the Server
 266 **************************************************************************/
 267 static void nfs_umountall_req(void)
 268 {
 269         uint32_t *p;
 270         int len;
 271         struct rpc_t *rpc_pkt = rpc_req_prep();
 272
 273         if ((nfs_server_mount_port == -1) || (!fs_mounted))
 274                 /* Nothing mounted, nothing to umount */
 275                 return;
 276
 277         p = rpc_pkt->u.call.data;
 278         p = rpc_add_credentials(p);
 279
 280         len = (uint32_t *)p - (uint32_t *)&(rpc_pkt->u.call.data);
 281
 282         rpc_req(PROG_MOUNT, MOUNT_UMOUNTALL, rpc_pkt, len);
 283 }
 284
 285 /***************************************************************************
 286  * NFS_READLINK (AH 2003-07-14)
 287  * This procedure is called when read of the first block fails -
 288  * this probably happens when it's a directory or a symlink
 289  * In case of successful readlink(), the dirname is manipulated,
 290  * so that inside the nfs() function a recursion can be done.
 291  **************************************************************************/
 292 static void nfs_readlink_req(void)
 293 {
 294         uint32_t *p;
 295         int len;
 296         struct rpc_t *rpc_pkt = rpc_req_prep();
 297
 298         p = rpc_pkt->u.call.data;
 299         p = rpc_add_credentials(p);
 300
 301         if (supported_nfs_versions & NFSV2_FLAG) {
 302                 memcpy(p, filefh, NFS_FHSIZE);
 303                 p += (NFS_FHSIZE / 4);
 304         } else { /* NFSV3_FLAG */
 305                 *p++ = htonl(filefh3_length);
 306                 memcpy(p, filefh, filefh3_length);
 307                 p += (filefh3_length / 4);
 308         }
 309
 310         len = (uint32_t *)p - (uint32_t *)&(rpc_pkt->u.call.data);
 311
 312         rpc_req(PROG_NFS, NFS_READLINK, rpc_pkt, len);
 313 }
 314
 315 /**************************************************************************
 316 NFS_LOOKUP - Lookup Pathname
 317 **************************************************************************/
 318 static void nfs_lookup_req(char *fname)
 319 {
 320         uint32_t *p;
 321         int len;
 322         int fnamelen;
 323         struct rpc_t *rpc_pkt = rpc_req_prep();
 324
 325         fnamelen = strlen(fname);
 326
 327         p = rpc_pkt->u.call.data;
 328         p = rpc_add_credentials(p);
 329
 330         if (supported_nfs_versions & NFSV2_FLAG) {
 331                 memcpy(p, dirfh, NFS_FHSIZE);
 332                 p += (NFS_FHSIZE / 4);
 333                 *p++ = htonl(fnamelen);
 334                 if (fnamelen & 3)
 335                         *(p + fnamelen / 4) = 0;
 336                 memcpy(p, fname, fnamelen);
 337                 p += (fnamelen + 3) / 4;
 338
 339                 len = (uint32_t *)p - (uint32_t *)&(rpc_pkt->u.call.data);
 340
 341                 rpc_req(PROG_NFS, NFS_LOOKUP, rpc_pkt, len);
 342         } else {  /* NFSV3_FLAG */
 343                 *p++ = htonl(NFS_FHSIZE);       /* Dir handle length */
 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 *)&(rpc_pkt->u.call.data);
 353
 354                 rpc_req(PROG_NFS, NFS3PROC_LOOKUP, rpc_pkt, len);
 355         }
 356 }
 357
 358 /**************************************************************************
 359 NFS_READ - Read File on NFS Server
 360 **************************************************************************/
 361 static void nfs_read_req(int offset, int readlen)
 362 {
 363         uint32_t *p;
 364         int len;
 365         struct rpc_t *rpc_pkt = rpc_req_prep();
 366
 367         p = rpc_pkt->u.call.data;
 368         p = rpc_add_credentials(p);
 369
 370         if (supported_nfs_versions & NFSV2_FLAG) {
 371                 memcpy(p, filefh, NFS_FHSIZE);
 372                 p += (NFS_FHSIZE / 4);
 373                 *p++ = htonl(offset);
 374                 *p++ = htonl(readlen);
 375                 *p++ = 0;
 376         } else { /* NFSV3_FLAG */
 377                 *p++ = htonl(filefh3_length);
 378                 memcpy(p, filefh, filefh3_length);
 379                 p += (filefh3_length / 4);
 380                 *p++ = htonl(0); /* offset is 64-bit long, so fill with 0 */
 381                 *p++ = htonl(offset);
 382                 *p++ = htonl(readlen);
 383                 *p++ = 0;
 384         }
 385
 386         len = (uint32_t *)p - (uint32_t *)&(rpc_pkt->u.call.data);
 387
 388         rpc_req(PROG_NFS, NFS_READ, rpc_pkt, len);
 389 }
 390
 391 /**************************************************************************
 392 RPC request dispatcher
 393 **************************************************************************/
 394 static void nfs_send(void)
 395 {
 396         debug("%s\n", __func__);
 397
 398         switch (nfs_state) {
 399         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 400                 if (supported_nfs_versions & NFSV2_FLAG)
 401                         rpc_lookup_req(PROG_MOUNT, 1);
 402                 else  /* NFSV3_FLAG */
 403                         rpc_lookup_req(PROG_MOUNT, 3);
 404                 break;
 405         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 406                 if (supported_nfs_versions & NFSV2_FLAG)
 407                         rpc_lookup_req(PROG_NFS, 2);
 408                 else  /* NFSV3_FLAG */
 409                         rpc_lookup_req(PROG_NFS, 3);
 410                 break;
 411         case STATE_MOUNT_REQ:
 412                 nfs_mount_req(nfs_path);
 413                 break;
 414         case STATE_UMOUNT_REQ:
 415                 nfs_umountall_req();
 416                 break;
 417         case STATE_LOOKUP_REQ:
 418                 nfs_lookup_req(nfs_filename);
 419                 break;
 420         case STATE_READ_REQ:
 421                 nfs_read_req(nfs_offset, nfs_len);
 422                 break;
 423         case STATE_READLINK_REQ:
 424                 nfs_readlink_req();
 425                 break;
 426         }
 427 }
 428
 429 /**************************************************************************
 430 Handlers for the reply from server
 431 **************************************************************************/
 432
 433 static int rpc_lookup_reply(int prog, uchar *pkt, unsigned len)
 434 {
 435         struct rpc_t rpc_pkt;
 436
 437         memcpy(&rpc_pkt.u.data[0], pkt, len);
 438
 439         debug("%s\n", __func__);
 440
 441         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 442                 return -NFS_RPC_ERR;
 443         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 444                 return -NFS_RPC_DROP;
 445
 446         if (rpc_pkt.u.reply.rstatus  ||
 447             rpc_pkt.u.reply.verifier ||
 448             rpc_pkt.u.reply.astatus)
 449                 return -1;
 450
 451         switch (prog) {
 452         case PROG_MOUNT:
 453                 nfs_server_mount_port = ntohl(rpc_pkt.u.reply.data[0]);
 454                 break;
 455         case PROG_NFS:
 456                 nfs_server_port = ntohl(rpc_pkt.u.reply.data[0]);
 457                 break;
 458         }
 459
 460         return 0;
 461 }
 462
 463 static int nfs_mount_reply(uchar *pkt, unsigned len)
 464 {
 465         struct rpc_t rpc_pkt;
 466
 467         debug("%s\n", __func__);
 468
 469         memcpy(&rpc_pkt.u.data[0], pkt, len);
 470
 471         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 472                 return -NFS_RPC_ERR;
 473         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 474                 return -NFS_RPC_DROP;
 475
 476         if (rpc_pkt.u.reply.rstatus  ||
 477             rpc_pkt.u.reply.verifier ||
 478             rpc_pkt.u.reply.astatus  ||
 479             rpc_pkt.u.reply.data[0])
 480                 return -1;
 481
 482         fs_mounted = 1;
 483         /*  NFSv2 and NFSv3 use same structure */
 484         memcpy(dirfh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 485
 486         return 0;
 487 }
 488
 489 static int nfs_umountall_reply(uchar *pkt, unsigned len)
 490 {
 491         struct rpc_t rpc_pkt;
 492
 493         debug("%s\n", __func__);
 494
 495         memcpy(&rpc_pkt.u.data[0], pkt, len);
 496
 497         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 498                 return -NFS_RPC_ERR;
 499         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 500                 return -NFS_RPC_DROP;
 501
 502         if (rpc_pkt.u.reply.rstatus  ||
 503             rpc_pkt.u.reply.verifier ||
 504             rpc_pkt.u.reply.astatus)
 505                 return -1;
 506
 507         fs_mounted = 0;
 508         memset(dirfh, 0, sizeof(dirfh));
 509
 510         return 0;
 511 }
 512
 513 static int nfs_lookup_reply(uchar *pkt, unsigned len)
 514 {
 515         struct rpc_t rpc_pkt;
 516
 517         debug("%s\n", __func__);
 518
 519         memcpy(&rpc_pkt.u.data[0], pkt, len);
 520
 521         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 522                 return -NFS_RPC_ERR;
 523         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 524                 return -NFS_RPC_DROP;
 525
 526         if (rpc_pkt.u.reply.rstatus  ||
 527             rpc_pkt.u.reply.verifier ||
 528             rpc_pkt.u.reply.astatus  ||
 529             rpc_pkt.u.reply.data[0]) {
 530                 switch (ntohl(rpc_pkt.u.reply.astatus)) {
 531                 case NFS_RPC_SUCCESS: /* Not an error */
 532                         break;
 533                 case NFS_RPC_PROG_MISMATCH:
 534                         /* Remote can't support NFS version */
 535                         switch (ntohl(rpc_pkt.u.reply.data[0])) {
 536                         /* Minimal supported NFS version */
 537                         case 3:
 538                                 debug("*** Waring: NFS version not supported: Requested: V%d, accepted: min V%d - max V%d\n",
 539                                       (supported_nfs_versions & NFSV2_FLAG) ?
 540                                                 2 : 3,
 541                                       ntohl(rpc_pkt.u.reply.data[0]),
 542                                       ntohl(rpc_pkt.u.reply.data[1]));
 543                                 debug("Will retry with NFSv3\n");
 544                                 /* Clear NFSV2_FLAG from supported versions */
 545                                 supported_nfs_versions &= ~NFSV2_FLAG;
 546                                 return -NFS_RPC_PROG_MISMATCH;
 547                         case 4:
 548                         default:
 549                                 puts("*** ERROR: NFS version not supported");
 550                                 debug(": Requested: V%d, accepted: min V%d - max V%d\n",
 551                                       (supported_nfs_versions & NFSV2_FLAG) ?
 552                                                 2 : 3,
 553                                       ntohl(rpc_pkt.u.reply.data[0]),
 554                                       ntohl(rpc_pkt.u.reply.data[1]));
 555                                 puts("\n");
 556                         }
 557                         break;
 558                 case NFS_RPC_PROG_UNAVAIL:
 559                 case NFS_RPC_PROC_UNAVAIL:
 560                 case NFS_RPC_GARBAGE_ARGS:
 561                 case NFS_RPC_SYSTEM_ERR:
 562                 default: /* Unknown error on 'accept state' flag */
 563                         debug("*** ERROR: accept state error (%d)\n",
 564                               ntohl(rpc_pkt.u.reply.astatus));
 565                         break;
 566                 }
 567                 return -1;
 568         }
 569
 570         if (supported_nfs_versions & NFSV2_FLAG) {
 571                 memcpy(filefh, rpc_pkt.u.reply.data + 1, NFS_FHSIZE);
 572         } else {  /* NFSV3_FLAG */
 573                 filefh3_length = ntohl(rpc_pkt.u.reply.data[1]);
 574                 if (filefh3_length > NFS3_FHSIZE)
 575                         filefh3_length  = NFS3_FHSIZE;
 576                 memcpy(filefh, rpc_pkt.u.reply.data + 2, filefh3_length);
 577         }
 578
 579         return 0;
 580 }
 581
 582 static int nfs3_get_attributes_offset(uint32_t *data)
 583 {
 584         if (ntohl(data[1]) != 0) {
 585                 /* 'attributes_follow' flag is TRUE,
 586                  * so we have attributes on 21 dwords */
 587                 /* Skip unused values :
 588                         type;   32 bits value,
 589                         mode;   32 bits value,
 590                         nlink;  32 bits value,
 591                         uid;    32 bits value,
 592                         gid;    32 bits value,
 593                         size;   64 bits value,
 594                         used;   64 bits value,
 595                         rdev;   64 bits value,
 596                         fsid;   64 bits value,
 597                         fileid; 64 bits value,
 598                         atime;  64 bits value,
 599                         mtime;  64 bits value,
 600                         ctime;  64 bits value,
 601                 */
 602                 return 22;
 603         } else {
 604                 /* 'attributes_follow' flag is FALSE,
 605                  * so we don't have any attributes */
 606                 return 1;
 607         }
 608 }
 609
 610 static int nfs_readlink_reply(uchar *pkt, unsigned len)
 611 {
 612         struct rpc_t rpc_pkt;
 613         int rlen;
 614         int nfsv3_data_offset = 0;
 615
 616         debug("%s\n", __func__);
 617
 618         memcpy((unsigned char *)&rpc_pkt, pkt, len);
 619
 620         if (ntohl(rpc_pkt.u.reply.id) > rpc_id)
 621                 return -NFS_RPC_ERR;
 622         else if (ntohl(rpc_pkt.u.reply.id) < rpc_id)
 623                 return -NFS_RPC_DROP;
 624
 625         if (rpc_pkt.u.reply.rstatus  ||
 626             rpc_pkt.u.reply.verifier ||
 627             rpc_pkt.u.reply.astatus  ||
 628             rpc_pkt.u.reply.data[0])
 629                 return -1;
 630
 631         if (!(supported_nfs_versions & NFSV2_FLAG)) { /* NFSV3_FLAG */
 632                 nfsv3_data_offset =
 633                         nfs3_get_attributes_offset(rpc_pkt.u.reply.data);
 634         }
 635
 636         /* new path length */
 637         rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]);
 638
 639         if (*((char *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset])) != '/') {
 640                 int pathlen;
 641
 642                 strcat(nfs_path, "/");
 643                 pathlen = strlen(nfs_path);
 644                 memcpy(nfs_path + pathlen,
 645                        (uchar *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset]),
 646                        rlen);
 647                 nfs_path[pathlen + rlen] = 0;
 648         } else {
 649                 memcpy(nfs_path,
 650                        (uchar *)&(rpc_pkt.u.reply.data[2 + nfsv3_data_offset]),
 651                        rlen);
 652                 nfs_path[rlen] = 0;
 653         }
 654         return 0;
 655 }
 656
 657 static int nfs_read_reply(uchar *pkt, unsigned len)
 658 {
 659         struct rpc_t rpc_pkt;
 660         int rlen;
 661         uchar *data_ptr;
 662
 663         debug("%s\n", __func__);
 664
 665         memcpy(&rpc_pkt.u.data[0], pkt, sizeof(rpc_pkt.u.reply));
 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                 if (rpc_pkt.u.reply.rstatus)
 677                         return -9999;
 678                 if (rpc_pkt.u.reply.astatus)
 679                         return -9999;
 680                 return -ntohl(rpc_pkt.u.reply.data[0]);
 681         }
 682
 683         if ((nfs_offset != 0) && !((nfs_offset) %
 684                         (NFS_READ_SIZE / 2 * 10 * HASHES_PER_LINE)))
 685                 puts("\n\t ");
 686         if (!(nfs_offset % ((NFS_READ_SIZE / 2) * 10)))
 687                 putc('#');
 688
 689         if (supported_nfs_versions & NFSV2_FLAG) {
 690                 rlen = ntohl(rpc_pkt.u.reply.data[18]);
 691                 data_ptr = (uchar *)&(rpc_pkt.u.reply.data[19]);
 692         } else {  /* NFSV3_FLAG */
 693                 int nfsv3_data_offset =
 694                         nfs3_get_attributes_offset(rpc_pkt.u.reply.data);
 695
 696                 /* count value */
 697                 rlen = ntohl(rpc_pkt.u.reply.data[1 + nfsv3_data_offset]);
 698                 /* Skip unused values :
 699                         EOF:            32 bits value,
 700                         data_size:      32 bits value,
 701                 */
 702                 data_ptr = (uchar *)
 703                         &(rpc_pkt.u.reply.data[4 + nfsv3_data_offset]);
 704         }
 705
 706         if (store_block(data_ptr, nfs_offset, rlen))
 707                         return -9999;
 708
 709         return rlen;
 710 }
 711
 712 /**************************************************************************
 713 Interfaces of U-BOOT
 714 **************************************************************************/
 715 static void nfs_timeout_handler(void)
 716 {
 717         if (++nfs_timeout_count > NFS_RETRY_COUNT) {
 718                 puts("\nRetry count exceeded; starting again\n");
 719                 net_start_again();
 720         } else {
 721                 puts("T ");
 722                 net_set_timeout_handler(nfs_timeout +
 723                                         NFS_TIMEOUT * nfs_timeout_count,
 724                                         nfs_timeout_handler);
 725                 nfs_send();
 726         }
 727 }
 728
 729 static void nfs_handler(uchar *pkt, unsigned dest, struct in_addr sip,
 730                         unsigned src, unsigned len)
 731 {
 732         int rlen;
 733         int reply;
 734
 735         debug("%s\n", __func__);
 736
 737         if (dest != nfs_our_port)
 738                 return;
 739
 740         switch (nfs_state) {
 741         case STATE_PRCLOOKUP_PROG_MOUNT_REQ:
 742                 if (rpc_lookup_reply(PROG_MOUNT, pkt, len) == -NFS_RPC_DROP)
 743                         break;
 744                 nfs_state = STATE_PRCLOOKUP_PROG_NFS_REQ;
 745                 nfs_send();
 746                 break;
 747
 748         case STATE_PRCLOOKUP_PROG_NFS_REQ:
 749                 if (rpc_lookup_reply(PROG_NFS, pkt, len) == -NFS_RPC_DROP)
 750                         break;
 751                 nfs_state = STATE_MOUNT_REQ;
 752                 nfs_send();
 753                 break;
 754
 755         case STATE_MOUNT_REQ:
 756                 reply = nfs_mount_reply(pkt, len);
 757                 if (reply == -NFS_RPC_DROP) {
 758                         break;
 759                 } else if (reply == -NFS_RPC_ERR) {
 760                         puts("*** ERROR: Cannot mount\n");
 761                         /* just to be sure... */
 762                         nfs_state = STATE_UMOUNT_REQ;
 763                         nfs_send();
 764                 } else {
 765                         nfs_state = STATE_LOOKUP_REQ;
 766                         nfs_send();
 767                 }
 768                 break;
 769
 770         case STATE_UMOUNT_REQ:
 771                 reply = nfs_umountall_reply(pkt, len);
 772                 if (reply == -NFS_RPC_DROP) {
 773                         break;
 774                 } else if (reply == -NFS_RPC_ERR) {
 775                         debug("*** ERROR: Cannot umount\n");
 776                         net_set_state(NETLOOP_FAIL);
 777                 } else {
 778                         puts("\ndone\n");
 779                         net_set_state(nfs_download_state);
 780                 }
 781                 break;
 782
 783         case STATE_LOOKUP_REQ:
 784                 reply = nfs_lookup_reply(pkt, len);
 785                 if (reply == -NFS_RPC_DROP) {
 786                         break;
 787                 } else if (reply == -NFS_RPC_ERR) {
 788                         puts("*** ERROR: File lookup fail\n");
 789                         nfs_state = STATE_UMOUNT_REQ;
 790                         nfs_send();
 791                 } else if (reply == -NFS_RPC_PROG_MISMATCH &&
 792                            supported_nfs_versions != 0) {
 793                         /* umount */
 794                         nfs_state = STATE_UMOUNT_REQ;
 795                         nfs_send();
 796                         /* And retry with another supported version */
 797                         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 798                         nfs_send();
 799                 } else {
 800                         nfs_state = STATE_READ_REQ;
 801                         nfs_offset = 0;
 802                         nfs_len = NFS_READ_SIZE;
 803                         nfs_send();
 804                 }
 805                 break;
 806
 807         case STATE_READLINK_REQ:
 808                 reply = nfs_readlink_reply(pkt, len);
 809                 if (reply == -NFS_RPC_DROP) {
 810                         break;
 811                 } else if (reply == -NFS_RPC_ERR) {
 812                         puts("*** ERROR: Symlink fail\n");
 813                         nfs_state = STATE_UMOUNT_REQ;
 814                         nfs_send();
 815                 } else {
 816                         debug("Symlink --> %s\n", nfs_path);
 817                         nfs_filename = basename(nfs_path);
 818                         nfs_path     = dirname(nfs_path);
 819
 820                         nfs_state = STATE_MOUNT_REQ;
 821                         nfs_send();
 822                 }
 823                 break;
 824
 825         case STATE_READ_REQ:
 826                 rlen = nfs_read_reply(pkt, len);
 827                 net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 828                 if (rlen > 0) {
 829                         nfs_offset += rlen;
 830                         nfs_send();
 831                 } else if ((rlen == -NFSERR_ISDIR) || (rlen == -NFSERR_INVAL)) {
 832                         /* symbolic link */
 833                         nfs_state = STATE_READLINK_REQ;
 834                         nfs_send();
 835                 } else {
 836                         if (!rlen)
 837                                 nfs_download_state = NETLOOP_SUCCESS;
 838                         if (rlen < 0)
 839                                 debug("NFS READ error (%d)\n", rlen);
 840                         nfs_state = STATE_UMOUNT_REQ;
 841                         nfs_send();
 842                 }
 843                 break;
 844         }
 845 }
 846
 847
 848 void nfs_start(void)
 849 {
 850         debug("%s\n", __func__);
 851         nfs_download_state = NETLOOP_FAIL;
 852
 853         nfs_server_ip = net_server_ip;
 854         nfs_path = (char *)nfs_path_buff;
 855
 856         if (nfs_path == NULL) {
 857                 net_set_state(NETLOOP_FAIL);
 858                 debug("*** ERROR: Fail allocate memory\n");
 859                 return;
 860         }
 861
 862         if (net_boot_file_name[0] == '\0') {
 863                 sprintf(nfs_path, "/nfsroot/%02X%02X%02X%02X.img",
 864                         net_ip.s_addr & 0xFF,
 865                         (net_ip.s_addr >>  8) & 0xFF,
 866                         (net_ip.s_addr >> 16) & 0xFF,
 867                         (net_ip.s_addr >> 24) & 0xFF);
 868
 869                 debug("*** Warning: no boot file name; using '%s'\n",
 870                       nfs_path);
 871         } else {
 872                 char *p = net_boot_file_name;
 873
 874                 p = strchr(p, ':');
 875
 876                 if (p != NULL) {
 877                         nfs_server_ip = string_to_ip(net_boot_file_name);
 878                         ++p;
 879                         strcpy(nfs_path, p);
 880                 } else {
 881                         strcpy(nfs_path, net_boot_file_name);
 882                 }
 883         }
 884
 885         nfs_filename = basename(nfs_path);
 886         nfs_path     = dirname(nfs_path);
 887
 888         debug("Using %s device\n", eth_get_name());
 889
 890         debug("File transfer via NFS from server %pI4; our IP address is %pI4",
 891               &nfs_server_ip, &net_ip);
 892
 893         /* Check if we need to send across this subnet */
 894         if (net_gateway.s_addr && net_netmask.s_addr) {
 895                 struct in_addr our_net;
 896                 struct in_addr server_net;
 897
 898                 our_net.s_addr = net_ip.s_addr & net_netmask.s_addr;
 899                 server_net.s_addr = net_server_ip.s_addr & net_netmask.s_addr;
 900                 if (our_net.s_addr != server_net.s_addr)
 901                         debug("; sending through gateway %pI4",
 902                               &net_gateway);
 903         }
 904         debug("\nFilename '%s/%s'.", nfs_path, nfs_filename);
 905
 906         if (net_boot_file_expected_size_in_blocks) {
 907                 debug(" Size is 0x%x Bytes = ",
 908                       net_boot_file_expected_size_in_blocks << 9);
 909                 print_size(net_boot_file_expected_size_in_blocks << 9, "");
 910         }
 911         debug("\nLoad address: 0x%lx\nLoading: *\b", load_addr);
 912
 913         net_set_timeout_handler(nfs_timeout, nfs_timeout_handler);
 914         net_set_udp_handler(nfs_handler);
 915
 916         nfs_timeout_count = 0;
 917         nfs_state = STATE_PRCLOOKUP_PROG_MOUNT_REQ;
 918
 919         /*nfs_our_port = 4096 + (get_ticks() % 3072);*/
 920         /*FIX ME !!!*/
 921         nfs_our_port = 1000;
 922
 923         /* zero out server ether in case the server ip has changed */
 924         memset(net_server_ethaddr, 0, 6);
 925
 926         nfs_send();
 927 }