fs/lockd/xdr.c

   1 /*
   2  * linux/fs/lockd/xdr.c
   3  *
   4  * XDR support for lockd and the lock client.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/utsname.h>
  13 #include <linux/nfs.h>
  14
  15 #include <linux/sunrpc/xdr.h>
  16 #include <linux/sunrpc/clnt.h>
  17 #include <linux/sunrpc/svc.h>
  18 #include <linux/sunrpc/stats.h>
  19 #include <linux/lockd/lockd.h>
  20 #include <linux/lockd/sm_inter.h>
  21
  22 #define NLMDBG_FACILITY         NLMDBG_XDR
  23
  24
  25 static inline loff_t
  26 s32_to_loff_t(__s32 offset)
  27 {
  28         return (loff_t)offset;
  29 }
  30
  31 static inline __s32
  32 loff_t_to_s32(loff_t offset)
  33 {
  34         __s32 res;
  35         if (offset >= NLM_OFFSET_MAX)
  36                 res = NLM_OFFSET_MAX;
  37         else if (offset <= -NLM_OFFSET_MAX)
  38                 res = -NLM_OFFSET_MAX;
  39         else
  40                 res = offset;
  41         return res;
  42 }
  43
  44 /*
  45  * XDR functions for basic NLM types
  46  */
  47 static u32 *nlm_decode_cookie(u32 *p, struct nlm_cookie *c)
  48 {
  49         unsigned int    len;
  50
  51         len = ntohl(*p++);
  52
  53         if(len==0)
  54         {
  55                 c->len=4;
  56                 memset(c->data, 0, 4);  /* hockeypux brain damage */
  57         }
  58         else if(len<=NLM_MAXCOOKIELEN)
  59         {
  60                 c->len=len;
  61                 memcpy(c->data, p, len);
  62                 p+=XDR_QUADLEN(len);
  63         }
  64         else
  65         {
  66                 printk(KERN_NOTICE
  67                         "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
  68                 return NULL;
  69         }
  70         return p;
  71 }
  72
  73 static inline u32 *
  74 nlm_encode_cookie(u32 *p, struct nlm_cookie *c)
  75 {
  76         *p++ = htonl(c->len);
  77         memcpy(p, c->data, c->len);
  78         p+=XDR_QUADLEN(c->len);
  79         return p;
  80 }
  81
  82 static u32 *
  83 nlm_decode_fh(u32 *p, struct nfs_fh *f)
  84 {
  85         unsigned int    len;
  86
  87         if ((len = ntohl(*p++)) != NFS2_FHSIZE) {
  88                 printk(KERN_NOTICE
  89                         "lockd: bad fhandle size %d (should be %d)\n",
  90                         len, NFS2_FHSIZE);
  91                 return NULL;
  92         }
  93         f->size = NFS2_FHSIZE;
  94         memset(f->data, 0, sizeof(f->data));
  95         memcpy(f->data, p, NFS2_FHSIZE);
  96         return p + XDR_QUADLEN(NFS2_FHSIZE);
  97 }
  98
  99 static inline u32 *
 100 nlm_encode_fh(u32 *p, struct nfs_fh *f)
 101 {
 102         *p++ = htonl(NFS2_FHSIZE);
 103         memcpy(p, f->data, NFS2_FHSIZE);
 104         return p + XDR_QUADLEN(NFS2_FHSIZE);
 105 }
 106
 107 /*
 108  * Encode and decode owner handle
 109  */
 110 static inline u32 *
 111 nlm_decode_oh(u32 *p, struct xdr_netobj *oh)
 112 {
 113         return xdr_decode_netobj(p, oh);
 114 }
 115
 116 static inline u32 *
 117 nlm_encode_oh(u32 *p, struct xdr_netobj *oh)
 118 {
 119         return xdr_encode_netobj(p, oh);
 120 }
 121
 122 static u32 *
 123 nlm_decode_lock(u32 *p, struct nlm_lock *lock)
 124 {
 125         struct file_lock        *fl = &lock->fl;
 126         s32                     start, len, end;
 127
 128         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 129                                             &lock->len,
 130                                             NLM_MAXSTRLEN))
 131          || !(p = nlm_decode_fh(p, &lock->fh))
 132          || !(p = nlm_decode_oh(p, &lock->oh)))
 133                 return NULL;
 134
 135         locks_init_lock(fl);
 136         fl->fl_owner = current->files;
 137         fl->fl_pid   = ntohl(*p++);
 138         fl->fl_flags = FL_POSIX;
 139         fl->fl_type  = F_RDLCK;         /* as good as anything else */
 140         start = ntohl(*p++);
 141         len = ntohl(*p++);
 142         end = start + len - 1;
 143
 144         fl->fl_start = s32_to_loff_t(start);
 145
 146         if (len == 0 || end < 0)
 147                 fl->fl_end = OFFSET_MAX;
 148         else
 149                 fl->fl_end = s32_to_loff_t(end);
 150         return p;
 151 }
 152
 153 /*
 154  * Encode a lock as part of an NLM call
 155  */
 156 static u32 *
 157 nlm_encode_lock(u32 *p, struct nlm_lock *lock)
 158 {
 159         struct file_lock        *fl = &lock->fl;
 160         __s32                   start, len;
 161
 162         if (!(p = xdr_encode_string(p, lock->caller))
 163          || !(p = nlm_encode_fh(p, &lock->fh))
 164          || !(p = nlm_encode_oh(p, &lock->oh)))
 165                 return NULL;
 166
 167         if (fl->fl_start > NLM_OFFSET_MAX
 168          || (fl->fl_end > NLM_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
 169                 return NULL;
 170
 171         start = loff_t_to_s32(fl->fl_start);
 172         if (fl->fl_end == OFFSET_MAX)
 173                 len = 0;
 174         else
 175                 len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
 176
 177         *p++ = htonl(fl->fl_pid);
 178         *p++ = htonl(start);
 179         *p++ = htonl(len);
 180
 181         return p;
 182 }
 183
 184 /*
 185  * Encode result of a TEST/TEST_MSG call
 186  */
 187 static u32 *
 188 nlm_encode_testres(u32 *p, struct nlm_res *resp)
 189 {
 190         s32             start, len;
 191
 192         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 193                 return NULL;
 194         *p++ = resp->status;
 195
 196         if (resp->status == nlm_lck_denied) {
 197                 struct file_lock        *fl = &resp->lock.fl;
 198
 199                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
 200                 *p++ = htonl(fl->fl_pid);
 201
 202                 /* Encode owner handle. */
 203                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
 204                         return NULL;
 205
 206                 start = loff_t_to_s32(fl->fl_start);
 207                 if (fl->fl_end == OFFSET_MAX)
 208                         len = 0;
 209                 else
 210                         len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1);
 211
 212                 *p++ = htonl(start);
 213                 *p++ = htonl(len);
 214         }
 215
 216         return p;
 217 }
 218
 219
 220 /*
 221  * First, the server side XDR functions
 222  */
 223 int
 224 nlmsvc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 225 {
 226         u32     exclusive;
 227
 228         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 229                 return 0;
 230
 231         exclusive = ntohl(*p++);
 232         if (!(p = nlm_decode_lock(p, &argp->lock)))
 233                 return 0;
 234         if (exclusive)
 235                 argp->lock.fl.fl_type = F_WRLCK;
 236
 237         return xdr_argsize_check(rqstp, p);
 238 }
 239
 240 int
 241 nlmsvc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 242 {
 243         if (!(p = nlm_encode_testres(p, resp)))
 244                 return 0;
 245         return xdr_ressize_check(rqstp, p);
 246 }
 247
 248 int
 249 nlmsvc_decode_lockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 250 {
 251         u32     exclusive;
 252
 253         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 254                 return 0;
 255         argp->block  = ntohl(*p++);
 256         exclusive    = ntohl(*p++);
 257         if (!(p = nlm_decode_lock(p, &argp->lock)))
 258                 return 0;
 259         if (exclusive)
 260                 argp->lock.fl.fl_type = F_WRLCK;
 261         argp->reclaim = ntohl(*p++);
 262         argp->state   = ntohl(*p++);
 263         argp->monitor = 1;              /* monitor client by default */
 264
 265         return xdr_argsize_check(rqstp, p);
 266 }
 267
 268 int
 269 nlmsvc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 270 {
 271         u32     exclusive;
 272
 273         if (!(p = nlm_decode_cookie(p, &argp->cookie)))
 274                 return 0;
 275         argp->block = ntohl(*p++);
 276         exclusive = ntohl(*p++);
 277         if (!(p = nlm_decode_lock(p, &argp->lock)))
 278                 return 0;
 279         if (exclusive)
 280                 argp->lock.fl.fl_type = F_WRLCK;
 281         return xdr_argsize_check(rqstp, p);
 282 }
 283
 284 int
 285 nlmsvc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 286 {
 287         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 288          || !(p = nlm_decode_lock(p, &argp->lock)))
 289                 return 0;
 290         argp->lock.fl.fl_type = F_UNLCK;
 291         return xdr_argsize_check(rqstp, p);
 292 }
 293
 294 int
 295 nlmsvc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 296 {
 297         struct nlm_lock *lock = &argp->lock;
 298
 299         memset(lock, 0, sizeof(*lock));
 300         locks_init_lock(&lock->fl);
 301         lock->fl.fl_pid = ~(u32) 0;
 302
 303         if (!(p = nlm_decode_cookie(p, &argp->cookie))
 304          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 305                                             &lock->len, NLM_MAXSTRLEN))
 306          || !(p = nlm_decode_fh(p, &lock->fh))
 307          || !(p = nlm_decode_oh(p, &lock->oh)))
 308                 return 0;
 309         argp->fsm_mode = ntohl(*p++);
 310         argp->fsm_access = ntohl(*p++);
 311         return xdr_argsize_check(rqstp, p);
 312 }
 313
 314 int
 315 nlmsvc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 316 {
 317         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 318                 return 0;
 319         *p++ = resp->status;
 320         *p++ = xdr_zero;                /* sequence argument */
 321         return xdr_ressize_check(rqstp, p);
 322 }
 323
 324 int
 325 nlmsvc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 326 {
 327         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 328                 return 0;
 329         *p++ = resp->status;
 330         return xdr_ressize_check(rqstp, p);
 331 }
 332
 333 int
 334 nlmsvc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp)
 335 {
 336         struct nlm_lock *lock = &argp->lock;
 337
 338         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 339                                             &lock->len, NLM_MAXSTRLEN)))
 340                 return 0;
 341         argp->state = ntohl(*p++);
 342         return xdr_argsize_check(rqstp, p);
 343 }
 344
 345 int
 346 nlmsvc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
 347 {
 348         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 349                 return 0;
 350         argp->state = ntohl(*p++);
 351         /* Preserve the address in network byte order */
 352         argp->addr = *p++;
 353         argp->vers = *p++;
 354         argp->proto = *p++;
 355         return xdr_argsize_check(rqstp, p);
 356 }
 357
 358 int
 359 nlmsvc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 360 {
 361         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
 362                 return 0;
 363         resp->status = ntohl(*p++);
 364         return xdr_argsize_check(rqstp, p);
 365 }
 366
 367 int
 368 nlmsvc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
 369 {
 370         return xdr_argsize_check(rqstp, p);
 371 }
 372
 373 int
 374 nlmsvc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
 375 {
 376         return xdr_ressize_check(rqstp, p);
 377 }
 378
 379 /*
 380  * Now, the client side XDR functions
 381  */
 382 #ifdef NLMCLNT_SUPPORT_SHARES
 383 static int
 384 nlmclt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
 385 {
 386         return 0;
 387 }
 388 #endif
 389
 390 static int
 391 nlmclt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 392 {
 393         struct nlm_lock *lock = &argp->lock;
 394
 395         if (!(p = nlm_encode_cookie(p, &argp->cookie)))
 396                 return -EIO;
 397         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 398         if (!(p = nlm_encode_lock(p, lock)))
 399                 return -EIO;
 400         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 401         return 0;
 402 }
 403
 404 static int
 405 nlmclt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 406 {
 407         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
 408                 return -EIO;
 409         resp->status = ntohl(*p++);
 410         if (resp->status == NLM_LCK_DENIED) {
 411                 struct file_lock        *fl = &resp->lock.fl;
 412                 u32                     excl;
 413                 s32                     start, len, end;
 414
 415                 memset(&resp->lock, 0, sizeof(resp->lock));
 416                 locks_init_lock(fl);
 417                 excl = ntohl(*p++);
 418                 fl->fl_pid = ntohl(*p++);
 419                 if (!(p = nlm_decode_oh(p, &resp->lock.oh)))
 420                         return -EIO;
 421
 422                 fl->fl_flags = FL_POSIX;
 423                 fl->fl_type  = excl? F_WRLCK : F_RDLCK;
 424                 start = ntohl(*p++);
 425                 len = ntohl(*p++);
 426                 end = start + len - 1;
 427
 428                 fl->fl_start = s32_to_loff_t(start);
 429                 if (len == 0 || end < 0)
 430                         fl->fl_end = OFFSET_MAX;
 431                 else
 432                         fl->fl_end = s32_to_loff_t(end);
 433         }
 434         return 0;
 435 }
 436
 437
 438 static int
 439 nlmclt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 440 {
 441         struct nlm_lock *lock = &argp->lock;
 442
 443         if (!(p = nlm_encode_cookie(p, &argp->cookie)))
 444                 return -EIO;
 445         *p++ = argp->block? xdr_one : xdr_zero;
 446         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 447         if (!(p = nlm_encode_lock(p, lock)))
 448                 return -EIO;
 449         *p++ = argp->reclaim? xdr_one : xdr_zero;
 450         *p++ = htonl(argp->state);
 451         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 452         return 0;
 453 }
 454
 455 static int
 456 nlmclt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 457 {
 458         struct nlm_lock *lock = &argp->lock;
 459
 460         if (!(p = nlm_encode_cookie(p, &argp->cookie)))
 461                 return -EIO;
 462         *p++ = argp->block? xdr_one : xdr_zero;
 463         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 464         if (!(p = nlm_encode_lock(p, lock)))
 465                 return -EIO;
 466         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 467         return 0;
 468 }
 469
 470 static int
 471 nlmclt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 472 {
 473         struct nlm_lock *lock = &argp->lock;
 474
 475         if (!(p = nlm_encode_cookie(p, &argp->cookie)))
 476                 return -EIO;
 477         if (!(p = nlm_encode_lock(p, lock)))
 478                 return -EIO;
 479         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 480         return 0;
 481 }
 482
 483 static int
 484 nlmclt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 485 {
 486         if (!(p = nlm_encode_cookie(p, &resp->cookie)))
 487                 return -EIO;
 488         *p++ = resp->status;
 489         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 490         return 0;
 491 }
 492
 493 static int
 494 nlmclt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 495 {
 496         if (!(p = nlm_encode_testres(p, resp)))
 497                 return -EIO;
 498         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 499         return 0;
 500 }
 501
 502 static int
 503 nlmclt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 504 {
 505         if (!(p = nlm_decode_cookie(p, &resp->cookie)))
 506                 return -EIO;
 507         resp->status = ntohl(*p++);
 508         return 0;
 509 }
 510
 511 /*
 512  * Buffer requirements for NLM
 513  */
 514 #define NLM_void_sz             0
 515 #define NLM_cookie_sz           1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
 516 #define NLM_caller_sz           1+XDR_QUADLEN(sizeof(system_utsname.nodename))
 517 #define NLM_netobj_sz           1+XDR_QUADLEN(XDR_MAX_NETOBJ)
 518 /* #define NLM_owner_sz         1+XDR_QUADLEN(NLM_MAXOWNER) */
 519 #define NLM_fhandle_sz          1+XDR_QUADLEN(NFS2_FHSIZE)
 520 #define NLM_lock_sz             3+NLM_caller_sz+NLM_netobj_sz+NLM_fhandle_sz
 521 #define NLM_holder_sz           4+NLM_netobj_sz
 522
 523 #define NLM_testargs_sz         NLM_cookie_sz+1+NLM_lock_sz
 524 #define NLM_lockargs_sz         NLM_cookie_sz+4+NLM_lock_sz
 525 #define NLM_cancargs_sz         NLM_cookie_sz+2+NLM_lock_sz
 526 #define NLM_unlockargs_sz       NLM_cookie_sz+NLM_lock_sz
 527
 528 #define NLM_testres_sz          NLM_cookie_sz+1+NLM_holder_sz
 529 #define NLM_res_sz              NLM_cookie_sz+1
 530 #define NLM_norep_sz            0
 531
 532 #ifndef MAX
 533 # define MAX(a, b)              (((a) > (b))? (a) : (b))
 534 #endif
 535
 536 /*
 537  * For NLM, a void procedure really returns nothing
 538  */
 539 #define nlmclt_decode_norep     NULL
 540
 541 #define PROC(proc, argtype, restype)    \
 542 [NLMPROC_##proc] = {                                                    \
 543         .p_proc      = NLMPROC_##proc,                                  \
 544         .p_encode    = (kxdrproc_t) nlmclt_encode_##argtype,            \
 545         .p_decode    = (kxdrproc_t) nlmclt_decode_##restype,            \
 546         .p_bufsiz    = MAX(NLM_##argtype##_sz, NLM_##restype##_sz) << 2 \
 547         }
 548
 549 static struct rpc_procinfo      nlm_procedures[] = {
 550     PROC(TEST,          testargs,       testres),
 551     PROC(LOCK,          lockargs,       res),
 552     PROC(CANCEL,        cancargs,       res),
 553     PROC(UNLOCK,        unlockargs,     res),
 554     PROC(GRANTED,       testargs,       res),
 555     PROC(TEST_MSG,      testargs,       norep),
 556     PROC(LOCK_MSG,      lockargs,       norep),
 557     PROC(CANCEL_MSG,    cancargs,       norep),
 558     PROC(UNLOCK_MSG,    unlockargs,     norep),
 559     PROC(GRANTED_MSG,   testargs,       norep),
 560     PROC(TEST_RES,      testres,        norep),
 561     PROC(LOCK_RES,      res,            norep),
 562     PROC(CANCEL_RES,    res,            norep),
 563     PROC(UNLOCK_RES,    res,            norep),
 564     PROC(GRANTED_RES,   res,            norep),
 565 #ifdef NLMCLNT_SUPPORT_SHARES
 566     PROC(SHARE,         shareargs,      shareres),
 567     PROC(UNSHARE,       shareargs,      shareres),
 568     PROC(NM_LOCK,       lockargs,       res),
 569     PROC(FREE_ALL,      notify,         void),
 570 #endif
 571 };
 572
 573 static struct rpc_version       nlm_version1 = {
 574                 .number         = 1,
 575                 .nrprocs        = 16,
 576                 .procs          = nlm_procedures,
 577 };
 578
 579 static struct rpc_version       nlm_version3 = {
 580                 .number         = 3,
 581                 .nrprocs        = 24,
 582                 .procs          = nlm_procedures,
 583 };
 584
 585 #ifdef  CONFIG_LOCKD_V4
 586 extern struct rpc_version nlm_version4;
 587 #endif
 588
 589 static struct rpc_version *     nlm_versions[] = {
 590         [1] = &nlm_version1,
 591         [3] = &nlm_version3,
 592 #ifdef  CONFIG_LOCKD_V4
 593         [4] = &nlm_version4,
 594 #endif
 595 };
 596
 597 static struct rpc_stat          nlm_stats;
 598
 599 struct rpc_program              nlm_program = {
 600                 .name           = "lockd",
 601                 .number         = NLM_PROGRAM,
 602                 .nrvers         = ARRAY_SIZE(nlm_versions),
 603                 .version        = nlm_versions,
 604                 .stats          = &nlm_stats,
 605 };
 606
 607 #ifdef RPC_DEBUG
 608 const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie)
 609 {
 610         /*
 611          * We can get away with a static buffer because we're only
 612          * called with BKL held.
 613          */
 614         static char buf[2*NLM_MAXCOOKIELEN+1];
 615         int i;
 616         int len = sizeof(buf);
 617         char *p = buf;
 618
 619         len--;  /* allow for trailing \0 */
 620         if (len < 3)
 621                 return "???";
 622         for (i = 0 ; i < cookie->len ; i++) {
 623                 if (len < 2) {
 624                         strcpy(p-3, "...");
 625                         break;
 626                 }
 627                 sprintf(p, "%02x", cookie->data[i]);
 628                 p += 2;
 629                 len -= 2;
 630         }
 631         *p = '\0';
 632
 633         return buf;
 634 }
 635 #endif