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/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 static inline loff_t
  25 s64_to_loff_t(__s64 offset)
  26 {
  27         return (loff_t)offset;
  28 }
  29
  30
  31 static inline s64
  32 loff_t_to_s64(loff_t offset)
  33 {
  34         s64 res;
  35         if (offset > NLM4_OFFSET_MAX)
  36                 res = NLM4_OFFSET_MAX;
  37         else if (offset < -NLM4_OFFSET_MAX)
  38                 res = -NLM4_OFFSET_MAX;
  39         else
  40                 res = offset;
  41         return res;
  42 }
  43
  44 /*
  45  * XDR functions for basic NLM types
  46  */
  47 static u32 *
  48 nlm4_decode_cookie(u32 *p, struct nlm_cookie *c)
  49 {
  50         unsigned int    len;
  51
  52         len = ntohl(*p++);
  53
  54         if(len==0)
  55         {
  56                 c->len=4;
  57                 memset(c->data, 0, 4);  /* hockeypux brain damage */
  58         }
  59         else if(len<=NLM_MAXCOOKIELEN)
  60         {
  61                 c->len=len;
  62                 memcpy(c->data, p, len);
  63                 p+=XDR_QUADLEN(len);
  64         }
  65         else
  66         {
  67                 printk(KERN_NOTICE
  68                         "lockd: bad cookie size %d (only cookies under %d bytes are supported.)\n", len, NLM_MAXCOOKIELEN);
  69                 return NULL;
  70         }
  71         return p;
  72 }
  73
  74 static u32 *
  75 nlm4_encode_cookie(u32 *p, struct nlm_cookie *c)
  76 {
  77         *p++ = htonl(c->len);
  78         memcpy(p, c->data, c->len);
  79         p+=XDR_QUADLEN(c->len);
  80         return p;
  81 }
  82
  83 static u32 *
  84 nlm4_decode_fh(u32 *p, struct nfs_fh *f)
  85 {
  86         memset(f->data, 0, sizeof(f->data));
  87         f->size = ntohl(*p++);
  88         if (f->size > NFS_MAXFHSIZE) {
  89                 printk(KERN_NOTICE
  90                         "lockd: bad fhandle size %d (should be <=%d)\n",
  91                         f->size, NFS_MAXFHSIZE);
  92                 return NULL;
  93         }
  94         memcpy(f->data, p, f->size);
  95         return p + XDR_QUADLEN(f->size);
  96 }
  97
  98 static u32 *
  99 nlm4_encode_fh(u32 *p, struct nfs_fh *f)
 100 {
 101         *p++ = htonl(f->size);
 102         if (f->size) p[XDR_QUADLEN(f->size)-1] = 0; /* don't leak anything */
 103         memcpy(p, f->data, f->size);
 104         return p + XDR_QUADLEN(f->size);
 105 }
 106
 107 /*
 108  * Encode and decode owner handle
 109  */
 110 static u32 *
 111 nlm4_decode_oh(u32 *p, struct xdr_netobj *oh)
 112 {
 113         return xdr_decode_netobj(p, oh);
 114 }
 115
 116 static u32 *
 117 nlm4_encode_oh(u32 *p, struct xdr_netobj *oh)
 118 {
 119         return xdr_encode_netobj(p, oh);
 120 }
 121
 122 static u32 *
 123 nlm4_decode_lock(u32 *p, struct nlm_lock *lock)
 124 {
 125         struct file_lock        *fl = &lock->fl;
 126         __s64                   len, start, end;
 127
 128         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 129                                             &lock->len, NLM_MAXSTRLEN))
 130          || !(p = nlm4_decode_fh(p, &lock->fh))
 131          || !(p = nlm4_decode_oh(p, &lock->oh)))
 132                 return NULL;
 133
 134         locks_init_lock(fl);
 135         fl->fl_owner = current->files;
 136         fl->fl_pid   = ntohl(*p++);
 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 u32 *
 156 nlm4_encode_lock(u32 *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(fl->fl_pid);
 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 u32 *
 188 nlm4_encode_testres(u32 *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(fl->fl_pid);
 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 %d pid %d type %d start %Ld end %Ld)\n",
 216                         resp->status, fl->fl_pid, 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, u32 *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, u32 *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, u32 *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, u32 *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, u32 *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, u32 *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->fl.fl_pid = ~(u32) 0;
 307
 308         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 309          || !(p = xdr_decode_string_inplace(p, &lock->caller,
 310                                             &lock->len, NLM_MAXSTRLEN))
 311          || !(p = nlm4_decode_fh(p, &lock->fh))
 312          || !(p = nlm4_decode_oh(p, &lock->oh)))
 313                 return 0;
 314         argp->fsm_mode = ntohl(*p++);
 315         argp->fsm_access = ntohl(*p++);
 316         return xdr_argsize_check(rqstp, p);
 317 }
 318
 319 int
 320 nlm4svc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 321 {
 322         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 323                 return 0;
 324         *p++ = resp->status;
 325         *p++ = xdr_zero;                /* sequence argument */
 326         return xdr_ressize_check(rqstp, p);
 327 }
 328
 329 int
 330 nlm4svc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 331 {
 332         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 333                 return 0;
 334         *p++ = resp->status;
 335         return xdr_ressize_check(rqstp, p);
 336 }
 337
 338 int
 339 nlm4svc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp)
 340 {
 341         struct nlm_lock *lock = &argp->lock;
 342
 343         if (!(p = xdr_decode_string_inplace(p, &lock->caller,
 344                                             &lock->len, NLM_MAXSTRLEN)))
 345                 return 0;
 346         argp->state = ntohl(*p++);
 347         return xdr_argsize_check(rqstp, p);
 348 }
 349
 350 int
 351 nlm4svc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
 352 {
 353         if (!(p = xdr_decode_string_inplace(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 354                 return 0;
 355         argp->state = ntohl(*p++);
 356         /* Preserve the address in network byte order */
 357         argp->addr = *p++;
 358         return xdr_argsize_check(rqstp, p);
 359 }
 360
 361 int
 362 nlm4svc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 363 {
 364         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 365                 return 0;
 366         resp->status = ntohl(*p++);
 367         return xdr_argsize_check(rqstp, p);
 368 }
 369
 370 int
 371 nlm4svc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
 372 {
 373         return xdr_argsize_check(rqstp, p);
 374 }
 375
 376 int
 377 nlm4svc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
 378 {
 379         return xdr_ressize_check(rqstp, p);
 380 }
 381
 382 /*
 383  * Now, the client side XDR functions
 384  */
 385 #ifdef NLMCLNT_SUPPORT_SHARES
 386 static int
 387 nlm4clt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
 388 {
 389         return 0;
 390 }
 391 #endif
 392
 393 static int
 394 nlm4clt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 395 {
 396         struct nlm_lock *lock = &argp->lock;
 397
 398         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 399                 return -EIO;
 400         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 401         if (!(p = nlm4_encode_lock(p, lock)))
 402                 return -EIO;
 403         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 404         return 0;
 405 }
 406
 407 static int
 408 nlm4clt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 409 {
 410         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 411                 return -EIO;
 412         resp->status = ntohl(*p++);
 413         if (resp->status == NLM_LCK_DENIED) {
 414                 struct file_lock        *fl = &resp->lock.fl;
 415                 u32                     excl;
 416                 s64                     start, end, len;
 417
 418                 memset(&resp->lock, 0, sizeof(resp->lock));
 419                 locks_init_lock(fl);
 420                 excl = ntohl(*p++);
 421                 fl->fl_pid = ntohl(*p++);
 422                 if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
 423                         return -EIO;
 424
 425                 fl->fl_flags = FL_POSIX;
 426                 fl->fl_type  = excl? F_WRLCK : F_RDLCK;
 427                 p = xdr_decode_hyper(p, &start);
 428                 p = xdr_decode_hyper(p, &len);
 429                 end = start + len - 1;
 430
 431                 fl->fl_start = s64_to_loff_t(start);
 432                 if (len == 0 || end < 0)
 433                         fl->fl_end = OFFSET_MAX;
 434                 else
 435                         fl->fl_end = s64_to_loff_t(end);
 436         }
 437         return 0;
 438 }
 439
 440
 441 static int
 442 nlm4clt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 443 {
 444         struct nlm_lock *lock = &argp->lock;
 445
 446         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 447                 return -EIO;
 448         *p++ = argp->block? xdr_one : xdr_zero;
 449         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 450         if (!(p = nlm4_encode_lock(p, lock)))
 451                 return -EIO;
 452         *p++ = argp->reclaim? xdr_one : xdr_zero;
 453         *p++ = htonl(argp->state);
 454         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 455         return 0;
 456 }
 457
 458 static int
 459 nlm4clt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 460 {
 461         struct nlm_lock *lock = &argp->lock;
 462
 463         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 464                 return -EIO;
 465         *p++ = argp->block? xdr_one : xdr_zero;
 466         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 467         if (!(p = nlm4_encode_lock(p, lock)))
 468                 return -EIO;
 469         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 470         return 0;
 471 }
 472
 473 static int
 474 nlm4clt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 475 {
 476         struct nlm_lock *lock = &argp->lock;
 477
 478         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 479                 return -EIO;
 480         if (!(p = nlm4_encode_lock(p, lock)))
 481                 return -EIO;
 482         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 483         return 0;
 484 }
 485
 486 static int
 487 nlm4clt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 488 {
 489         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 490                 return -EIO;
 491         *p++ = resp->status;
 492         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 493         return 0;
 494 }
 495
 496 static int
 497 nlm4clt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 498 {
 499         if (!(p = nlm4_encode_testres(p, resp)))
 500                 return -EIO;
 501         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 502         return 0;
 503 }
 504
 505 static int
 506 nlm4clt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 507 {
 508         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 509                 return -EIO;
 510         resp->status = ntohl(*p++);
 511         return 0;
 512 }
 513
 514 /*
 515  * Buffer requirements for NLM
 516  */
 517 #define NLM4_void_sz            0
 518 #define NLM4_cookie_sz          1+XDR_QUADLEN(NLM_MAXCOOKIELEN)
 519 #define NLM4_caller_sz          1+XDR_QUADLEN(NLM_MAXSTRLEN)
 520 #define NLM4_netobj_sz          1+XDR_QUADLEN(XDR_MAX_NETOBJ)
 521 /* #define NLM4_owner_sz                1+XDR_QUADLEN(NLM4_MAXOWNER) */
 522 #define NLM4_fhandle_sz         1+XDR_QUADLEN(NFS3_FHSIZE)
 523 #define NLM4_lock_sz            5+NLM4_caller_sz+NLM4_netobj_sz+NLM4_fhandle_sz
 524 #define NLM4_holder_sz          6+NLM4_netobj_sz
 525
 526 #define NLM4_testargs_sz        NLM4_cookie_sz+1+NLM4_lock_sz
 527 #define NLM4_lockargs_sz        NLM4_cookie_sz+4+NLM4_lock_sz
 528 #define NLM4_cancargs_sz        NLM4_cookie_sz+2+NLM4_lock_sz
 529 #define NLM4_unlockargs_sz      NLM4_cookie_sz+NLM4_lock_sz
 530
 531 #define NLM4_testres_sz         NLM4_cookie_sz+1+NLM4_holder_sz
 532 #define NLM4_res_sz             NLM4_cookie_sz+1
 533 #define NLM4_norep_sz           0
 534
 535 #ifndef MAX
 536 # define MAX(a,b)               (((a) > (b))? (a) : (b))
 537 #endif
 538
 539 /*
 540  * For NLM, a void procedure really returns nothing
 541  */
 542 #define nlm4clt_decode_norep    NULL
 543
 544 #define PROC(proc, argtype, restype)                                    \
 545 [NLMPROC_##proc] = {                                                    \
 546         .p_proc      = NLMPROC_##proc,                                  \
 547         .p_encode    = (kxdrproc_t) nlm4clt_encode_##argtype,           \
 548         .p_decode    = (kxdrproc_t) nlm4clt_decode_##restype,           \
 549         .p_bufsiz    = MAX(NLM4_##argtype##_sz, NLM4_##restype##_sz) << 2       \
 550         }
 551
 552 static struct rpc_procinfo      nlm4_procedures[] = {
 553     PROC(TEST,          testargs,       testres),
 554     PROC(LOCK,          lockargs,       res),
 555     PROC(CANCEL,        cancargs,       res),
 556     PROC(UNLOCK,        unlockargs,     res),
 557     PROC(GRANTED,       testargs,       res),
 558     PROC(TEST_MSG,      testargs,       norep),
 559     PROC(LOCK_MSG,      lockargs,       norep),
 560     PROC(CANCEL_MSG,    cancargs,       norep),
 561     PROC(UNLOCK_MSG,    unlockargs,     norep),
 562     PROC(GRANTED_MSG,   testargs,       norep),
 563     PROC(TEST_RES,      testres,        norep),
 564     PROC(LOCK_RES,      res,            norep),
 565     PROC(CANCEL_RES,    res,            norep),
 566     PROC(UNLOCK_RES,    res,            norep),
 567     PROC(GRANTED_RES,   res,            norep),
 568 #ifdef NLMCLNT_SUPPORT_SHARES
 569     PROC(SHARE,         shareargs,      shareres),
 570     PROC(UNSHARE,       shareargs,      shareres),
 571     PROC(NM_LOCK,       lockargs,       res),
 572     PROC(FREE_ALL,      notify,         void),
 573 #endif
 574 };
 575
 576 struct rpc_version      nlm_version4 = {
 577         .number         = 4,
 578         .nrprocs        = 24,
 579         .procs          = nlm4_procedures,
 580 };