fs/lockd/xdr4.c

   1 /*
   2  * linux/fs/lockd/xdr4.c
   3  *
   4  * XDR support for lockd and the lock client.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  * Copyright (C) 1999, Trond Myklebust <trond.myklebust@fys.uio.no>
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/nfs.h>
  13
  14 #include <linux/sunrpc/xdr.h>
  15 #include <linux/sunrpc/clnt.h>
  16 #include <linux/sunrpc/svc.h>
  17 #include <linux/sunrpc/stats.h>
  18 #include <linux/lockd/lockd.h>
  19
  20 #define NLMDBG_FACILITY         NLMDBG_XDR
  21
  22 static inline loff_t
  23 s64_to_loff_t(__s64 offset)
  24 {
  25         return (loff_t)offset;
  26 }
  27
  28
  29 static inline s64
  30 loff_t_to_s64(loff_t offset)
  31 {
  32         s64 res;
  33         if (offset > NLM4_OFFSET_MAX)
  34                 res = NLM4_OFFSET_MAX;
  35         else if (offset < -NLM4_OFFSET_MAX)
  36                 res = -NLM4_OFFSET_MAX;
  37         else
  38                 res = offset;
  39         return res;
  40 }
  41
  42 /*
  43  * XDR functions for basic NLM types
  44  */
  45 static __be32 *
  46 nlm4_decode_cookie(__be32 *p, struct nlm_cookie *c)
  47 {
  48         unsigned int    len;
  49
  50         len = ntohl(*p++);
  51
  52         if(len==0)
  53         {
  54                 c->len=4;
  55                 memset(c->data, 0, 4);  /* hockeypux brain damage */
  56         }
  57         else if(len<=NLM_MAXCOOKIELEN)
  58         {
  59                 c->len=len;
  60                 memcpy(c->data, p, len);
  61                 p+=XDR_QUADLEN(len);
  62         }
  63         else
  64         {
  65                 dprintk("lockd: bad cookie size %d (only cookies under "
  66                         "%d bytes are supported.)\n",
  67                                 len, NLM_MAXCOOKIELEN);
  68                 return NULL;
  69         }
  70         return p;
  71 }
  72
  73 static __be32 *
  74 nlm4_encode_cookie(__be32 *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 __be32 *
  83 nlm4_decode_fh(__be32 *p, struct nfs_fh *f)
  84 {
  85         memset(f->data, 0, sizeof(f->data));
  86         f->size = ntohl(*p++);
  87         if (f->size > NFS_MAXFHSIZE) {
  88                 dprintk("lockd: bad fhandle size %d (should be <=%d)\n",
  89                         f->size, NFS_MAXFHSIZE);
  90                 return NULL;
  91         }
  92         memcpy(f->data, p, f->size);
  93         return p + XDR_QUADLEN(f->size);
  94 }
  95
  96 static __be32 *
  97 nlm4_encode_fh(__be32 *p, struct nfs_fh *f)
  98 {
  99         *p++ = htonl(f->size);
 100         if (f->size) p[XDR_QUADLEN(f->size)-1] = 0; /* don't leak anything */
 101         memcpy(p, f->data, f->size);
 102         return p + XDR_QUADLEN(f->size);
 103 }
 104
 105 /*
 106  * Encode and decode owner handle
 107  */
 108 static __be32 *
 109 nlm4_decode_oh(__be32 *p, struct xdr_netobj *oh)
 110 {
 111         return xdr_decode_netobj(p, oh);
 112 }
 113
 114 static __be32 *
 115 nlm4_encode_oh(__be32 *p, struct xdr_netobj *oh)
 116 {
 117         return xdr_encode_netobj(p, oh);
 118 }
 119
 120 static __be32 *
 121 nlm4_decode_lock(__be32 *p, struct nlm_lock *lock)
 122 {
 123         struct file_lock        *fl = &lock->fl;
 124         __u64                   len, start;
 125         __s64                   end;
 126
 127         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 128                                             &lock->len, NLM_MAXSTRLEN))
 129          || !(p = nlm4_decode_fh(p, &lock->fh))
 130          || !(p = nlm4_decode_oh(p, &lock->oh)))
 131                 return NULL;
 132         lock->svid  = ntohl(*p++);
 133
 134         locks_init_lock(fl);
 135         fl->fl_owner = current->files;
 136         fl->fl_pid   = (pid_t)lock->svid;
 137         fl->fl_flags = FL_POSIX;
 138         fl->fl_type  = F_RDLCK;         /* as good as anything else */
 139         p = xdr_decode_hyper(p, &start);
 140         p = xdr_decode_hyper(p, &len);
 141         end = start + len - 1;
 142
 143         fl->fl_start = s64_to_loff_t(start);
 144
 145         if (len == 0 || end < 0)
 146                 fl->fl_end = OFFSET_MAX;
 147         else
 148                 fl->fl_end = s64_to_loff_t(end);
 149         return p;
 150 }
 151
 152 /*
 153  * Encode a lock as part of an NLM call
 154  */
 155 static __be32 *
 156 nlm4_encode_lock(__be32 *p, struct nlm_lock *lock)
 157 {
 158         struct file_lock        *fl = &lock->fl;
 159         __s64                   start, len;
 160
 161         if (!(p = xdr_encode_string(p, lock->caller))
 162          || !(p = nlm4_encode_fh(p, &lock->fh))
 163          || !(p = nlm4_encode_oh(p, &lock->oh)))
 164                 return NULL;
 165
 166         if (fl->fl_start > NLM4_OFFSET_MAX
 167          || (fl->fl_end > NLM4_OFFSET_MAX && fl->fl_end != OFFSET_MAX))
 168                 return NULL;
 169
 170         *p++ = htonl(lock->svid);
 171
 172         start = loff_t_to_s64(fl->fl_start);
 173         if (fl->fl_end == OFFSET_MAX)
 174                 len = 0;
 175         else
 176                 len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
 177
 178         p = xdr_encode_hyper(p, start);
 179         p = xdr_encode_hyper(p, len);
 180
 181         return p;
 182 }
 183
 184 /*
 185  * Encode result of a TEST/TEST_MSG call
 186  */
 187 static __be32 *
 188 nlm4_encode_testres(__be32 *p, struct nlm_res *resp)
 189 {
 190         s64             start, len;
 191
 192         dprintk("xdr: before encode_testres (p %p resp %p)\n", p, resp);
 193         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 194                 return NULL;
 195         *p++ = resp->status;
 196
 197         if (resp->status == nlm_lck_denied) {
 198                 struct file_lock        *fl = &resp->lock.fl;
 199
 200                 *p++ = (fl->fl_type == F_RDLCK)? xdr_zero : xdr_one;
 201                 *p++ = htonl(resp->lock.svid);
 202
 203                 /* Encode owner handle. */
 204                 if (!(p = xdr_encode_netobj(p, &resp->lock.oh)))
 205                         return NULL;
 206
 207                 start = loff_t_to_s64(fl->fl_start);
 208                 if (fl->fl_end == OFFSET_MAX)
 209                         len = 0;
 210                 else
 211                         len = loff_t_to_s64(fl->fl_end - fl->fl_start + 1);
 212
 213                 p = xdr_encode_hyper(p, start);
 214                 p = xdr_encode_hyper(p, len);
 215                 dprintk("xdr: encode_testres (status %u pid %d type %d start %Ld end %Ld)\n",
 216                         resp->status, (int)resp->lock.svid, fl->fl_type,
 217                         (long long)fl->fl_start,  (long long)fl->fl_end);
 218         }
 219
 220         dprintk("xdr: after encode_testres (p %p resp %p)\n", p, resp);
 221         return p;
 222 }
 223
 224
 225 /*
 226  * First, the server side XDR functions
 227  */
 228 int
 229 nlm4svc_decode_testargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 230 {
 231         u32     exclusive;
 232
 233         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 234                 return 0;
 235
 236         exclusive = ntohl(*p++);
 237         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 238                 return 0;
 239         if (exclusive)
 240                 argp->lock.fl.fl_type = F_WRLCK;
 241
 242         return xdr_argsize_check(rqstp, p);
 243 }
 244
 245 int
 246 nlm4svc_encode_testres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 247 {
 248         if (!(p = nlm4_encode_testres(p, resp)))
 249                 return 0;
 250         return xdr_ressize_check(rqstp, p);
 251 }
 252
 253 int
 254 nlm4svc_decode_lockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 255 {
 256         u32     exclusive;
 257
 258         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 259                 return 0;
 260         argp->block  = ntohl(*p++);
 261         exclusive    = ntohl(*p++);
 262         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 263                 return 0;
 264         if (exclusive)
 265                 argp->lock.fl.fl_type = F_WRLCK;
 266         argp->reclaim = ntohl(*p++);
 267         argp->state   = ntohl(*p++);
 268         argp->monitor = 1;              /* monitor client by default */
 269
 270         return xdr_argsize_check(rqstp, p);
 271 }
 272
 273 int
 274 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 275 {
 276         u32     exclusive;
 277
 278         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 279                 return 0;
 280         argp->block = ntohl(*p++);
 281         exclusive = ntohl(*p++);
 282         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 283                 return 0;
 284         if (exclusive)
 285                 argp->lock.fl.fl_type = F_WRLCK;
 286         return xdr_argsize_check(rqstp, p);
 287 }
 288
 289 int
 290 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 291 {
 292         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 293          || !(p = nlm4_decode_lock(p, &argp->lock)))
 294                 return 0;
 295         argp->lock.fl.fl_type = F_UNLCK;
 296         return xdr_argsize_check(rqstp, p);
 297 }
 298
 299 int
 300 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, __be32 *p, nlm_args *argp)
 301 {
 302         struct nlm_lock *lock = &argp->lock;
 303
 304         memset(lock, 0, sizeof(*lock));
 305         locks_init_lock(&lock->fl);
 306         lock->svid = ~(u32) 0;
 307         lock->fl.fl_pid = (pid_t)lock->svid;
 308
 309         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 310          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 311                                             &lock->len, NLM_MAXSTRLEN))
 312          || !(p = nlm4_decode_fh(p, &lock->fh))
 313          || !(p = nlm4_decode_oh(p, &lock->oh)))
 314                 return 0;
 315         argp->fsm_mode = ntohl(*p++);
 316         argp->fsm_access = ntohl(*p++);
 317         return xdr_argsize_check(rqstp, p);
 318 }
 319
 320 int
 321 nlm4svc_encode_shareres(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 322 {
 323         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 324                 return 0;
 325         *p++ = resp->status;
 326         *p++ = xdr_zero;                /* sequence argument */
 327         return xdr_ressize_check(rqstp, p);
 328 }
 329
 330 int
 331 nlm4svc_encode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 332 {
 333         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 334                 return 0;
 335         *p++ = resp->status;
 336         return xdr_ressize_check(rqstp, p);
 337 }
 338
 339 int
 340 nlm4svc_decode_notify(struct svc_rqst *rqstp, __be32 *p, struct nlm_args *argp)
 341 {
 342         struct nlm_lock *lock = &argp->lock;
 343
 344         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 345                                             &lock->len, NLM_MAXSTRLEN)))
 346                 return 0;
 347         argp->state = ntohl(*p++);
 348         return xdr_argsize_check(rqstp, p);
 349 }
 350
 351 int
 352 nlm4svc_decode_reboot(struct svc_rqst *rqstp, __be32 *p, struct nlm_reboot *argp)
 353 {
 354         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 355                 return 0;
 356         argp->state = ntohl(*p++);
 357         memcpy(&argp->priv.data, p, sizeof(argp->priv.data));
 358         p += XDR_QUADLEN(SM_PRIV_SIZE);
 359         return xdr_argsize_check(rqstp, p);
 360 }
 361
 362 int
 363 nlm4svc_decode_res(struct svc_rqst *rqstp, __be32 *p, struct nlm_res *resp)
 364 {
 365         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 366                 return 0;
 367         resp->status = *p++;
 368         return xdr_argsize_check(rqstp, p);
 369 }
 370
 371 int
 372 nlm4svc_decode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 373 {
 374         return xdr_argsize_check(rqstp, p);
 375 }
 376
 377 int
 378 nlm4svc_encode_void(struct svc_rqst *rqstp, __be32 *p, void *dummy)
 379 {
 380         return xdr_ressize_check(rqstp, p);
 381 }
 382
 383 /*
 384  * Now, the client side XDR functions
 385  */
 386 #ifdef NLMCLNT_SUPPORT_SHARES
 387 static int
 388 nlm4clt_decode_void(struct rpc_rqst *req, __be32 *p, void *ptr)
 389 {
 390         return 0;
 391 }
 392 #endif
 393
 394 static int
 395 nlm4clt_encode_testargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
 396 {
 397         struct nlm_lock *lock = &argp->lock;
 398
 399         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 400                 return -EIO;
 401         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 402         if (!(p = nlm4_encode_lock(p, lock)))
 403                 return -EIO;
 404         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 405         return 0;
 406 }
 407
 408 static int
 409 nlm4clt_decode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
 410 {
 411         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 412                 return -EIO;
 413         resp->status = *p++;
 414         if (resp->status == nlm_lck_denied) {
 415                 struct file_lock        *fl = &resp->lock.fl;
 416                 u32                     excl;
 417                 __u64                   start, len;
 418                 __s64                   end;
 419
 420                 memset(&resp->lock, 0, sizeof(resp->lock));
 421                 locks_init_lock(fl);
 422                 excl = ntohl(*p++);
 423                 resp->lock.svid = ntohl(*p++);
 424                 fl->fl_pid = (pid_t)resp->lock.svid;
 425                 if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
 426                         return -EIO;
 427
 428                 fl->fl_flags = FL_POSIX;
 429                 fl->fl_type  = excl? F_WRLCK : F_RDLCK;
 430                 p = xdr_decode_hyper(p, &start);
 431                 p = xdr_decode_hyper(p, &len);
 432                 end = start + len - 1;
 433
 434                 fl->fl_start = s64_to_loff_t(start);
 435                 if (len == 0 || end < 0)
 436                         fl->fl_end = OFFSET_MAX;
 437                 else
 438                         fl->fl_end = s64_to_loff_t(end);
 439         }
 440         return 0;
 441 }
 442
 443
 444 static int
 445 nlm4clt_encode_lockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
 446 {
 447         struct nlm_lock *lock = &argp->lock;
 448
 449         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 450                 return -EIO;
 451         *p++ = argp->block? xdr_one : xdr_zero;
 452         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 453         if (!(p = nlm4_encode_lock(p, lock)))
 454                 return -EIO;
 455         *p++ = argp->reclaim? xdr_one : xdr_zero;
 456         *p++ = htonl(argp->state);
 457         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 458         return 0;
 459 }
 460
 461 static int
 462 nlm4clt_encode_cancargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
 463 {
 464         struct nlm_lock *lock = &argp->lock;
 465
 466         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 467                 return -EIO;
 468         *p++ = argp->block? xdr_one : xdr_zero;
 469         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 470         if (!(p = nlm4_encode_lock(p, lock)))
 471                 return -EIO;
 472         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 473         return 0;
 474 }
 475
 476 static int
 477 nlm4clt_encode_unlockargs(struct rpc_rqst *req, __be32 *p, nlm_args *argp)
 478 {
 479         struct nlm_lock *lock = &argp->lock;
 480
 481         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 482                 return -EIO;
 483         if (!(p = nlm4_encode_lock(p, lock)))
 484                 return -EIO;
 485         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 486         return 0;
 487 }
 488
 489 static int
 490 nlm4clt_encode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
 491 {
 492         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 493                 return -EIO;
 494         *p++ = resp->status;
 495         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 496         return 0;
 497 }
 498
 499 static int
 500 nlm4clt_encode_testres(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
 501 {
 502         if (!(p = nlm4_encode_testres(p, resp)))
 503                 return -EIO;
 504         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 505         return 0;
 506 }
 507
 508 static int
 509 nlm4clt_decode_res(struct rpc_rqst *req, __be32 *p, struct nlm_res *resp)
 510 {
 511         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 512                 return -EIO;
 513         resp->status = *p++;
 514         return 0;
 515 }
 516
 517 #if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ)
 518 #  error "NLM host name cannot be larger than XDR_MAX_NETOBJ!"
 519 #endif
 520
 521 #if (NLMCLNT_OHSIZE > NLM_MAXSTRLEN)
 522 #  error "NLM host name cannot be larger than NLM's maximum string length!"
 523 #endif
 524
 525 /*
 526  * Buffer requirements for NLM
 527  */
 528 #define NLM4_void_sz            0
 529 #define NLM4_cookie_sz          1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
 530 #define NLM4_caller_sz          1+XDR_QUADLEN(NLMCLNT_OHSIZE)
 531 #define NLM4_owner_sz           1+XDR_QUADLEN(NLMCLNT_OHSIZE)
 532 #define NLM4_fhandle_sz         1+XDR_QUADLEN(NFS3_FHSIZE)
 533 #define NLM4_lock_sz            5+NLM4_caller_sz+NLM4_owner_sz+NLM4_fhandle_sz
 534 #define NLM4_holder_sz          6+NLM4_owner_sz
 535
 536 #define NLM4_testargs_sz        NLM4_cookie_sz+1+NLM4_lock_sz
 537 #define NLM4_lockargs_sz        NLM4_cookie_sz+4+NLM4_lock_sz
 538 #define NLM4_cancargs_sz        NLM4_cookie_sz+2+NLM4_lock_sz
 539 #define NLM4_unlockargs_sz      NLM4_cookie_sz+NLM4_lock_sz
 540
 541 #define NLM4_testres_sz         NLM4_cookie_sz+1+NLM4_holder_sz
 542 #define NLM4_res_sz             NLM4_cookie_sz+1
 543 #define NLM4_norep_sz           0
 544
 545 /*
 546  * For NLM, a void procedure really returns nothing
 547  */
 548 #define nlm4clt_decode_norep    NULL
 549
 550 #define PROC(proc, argtype, restype)                                    \
 551 [NLMPROC_##proc] = {                                                    \
 552         .p_proc      = NLMPROC_##proc,                                  \
 553         .p_encode    = (kxdrproc_t) nlm4clt_encode_##argtype,           \
 554         .p_decode    = (kxdrproc_t) nlm4clt_decode_##restype,           \
 555         .p_arglen    = NLM4_##argtype##_sz,                             \
 556         .p_replen    = NLM4_##restype##_sz,                             \
 557         .p_statidx   = NLMPROC_##proc,                                  \
 558         .p_name      = #proc,                                           \
 559         }
 560
 561 static struct rpc_procinfo      nlm4_procedures[] = {
 562     PROC(TEST,          testargs,       testres),
 563     PROC(LOCK,          lockargs,       res),
 564     PROC(CANCEL,        cancargs,       res),
 565     PROC(UNLOCK,        unlockargs,     res),
 566     PROC(GRANTED,       testargs,       res),
 567     PROC(TEST_MSG,      testargs,       norep),
 568     PROC(LOCK_MSG,      lockargs,       norep),
 569     PROC(CANCEL_MSG,    cancargs,       norep),
 570     PROC(UNLOCK_MSG,    unlockargs,     norep),
 571     PROC(GRANTED_MSG,   testargs,       norep),
 572     PROC(TEST_RES,      testres,        norep),
 573     PROC(LOCK_RES,      res,            norep),
 574     PROC(CANCEL_RES,    res,            norep),
 575     PROC(UNLOCK_RES,    res,            norep),
 576     PROC(GRANTED_RES,   res,            norep),
 577 #ifdef NLMCLNT_SUPPORT_SHARES
 578     PROC(SHARE,         shareargs,      shareres),
 579     PROC(UNSHARE,       shareargs,      shareres),
 580     PROC(NM_LOCK,       lockargs,       res),
 581     PROC(FREE_ALL,      notify,         void),
 582 #endif
 583 };
 584
 585 struct rpc_version      nlm_version4 = {
 586         .number         = 4,
 587         .nrprocs        = 24,
 588         .procs          = nlm4_procedures,
 589 };