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<=8)
  60         {
  61                 c->len=len;
  62                 memcpy(c->data, p, len);
  63                 p+=(len+3)>>2;
  64         }
  65         else
  66         {
  67                 printk(KERN_NOTICE
  68                         "lockd: bad cookie size %d (only cookies under 8 bytes are supported.)\n", len);
  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+=(c->len+3)>>2;
  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         int                     tmp;
 128
 129         if (!(p = xdr_decode_string(p, &lock->caller, &tmp, 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 0;
 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 0;
 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  * Check buffer bounds after decoding arguments
 227  */
 228 static int
 229 xdr_argsize_check(struct svc_rqst *rqstp, u32 *p)
 230 {
 231         struct svc_buf  *buf = &rqstp->rq_argbuf;
 232
 233         return p - buf->base <= buf->buflen;
 234 }
 235
 236 static int
 237 xdr_ressize_check(struct svc_rqst *rqstp, u32 *p)
 238 {
 239         struct svc_buf  *buf = &rqstp->rq_resbuf;
 240
 241         buf->len = p - buf->base;
 242         return (buf->len <= buf->buflen);
 243 }
 244
 245 /*
 246  * First, the server side XDR functions
 247  */
 248 int
 249 nlm4svc_decode_testargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 250 {
 251         u32     exclusive;
 252
 253         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 254                 return 0;
 255
 256         exclusive = ntohl(*p++);
 257         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 258                 return 0;
 259         if (exclusive)
 260                 argp->lock.fl.fl_type = F_WRLCK;
 261
 262         return xdr_argsize_check(rqstp, p);
 263 }
 264
 265 int
 266 nlm4svc_encode_testres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 267 {
 268         if (!(p = nlm4_encode_testres(p, resp)))
 269                 return 0;
 270         return xdr_ressize_check(rqstp, p);
 271 }
 272
 273 int
 274 nlm4svc_decode_lockargs(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         argp->reclaim = ntohl(*p++);
 287         argp->state   = ntohl(*p++);
 288         argp->monitor = 1;              /* monitor client by default */
 289
 290         return xdr_argsize_check(rqstp, p);
 291 }
 292
 293 int
 294 nlm4svc_decode_cancargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 295 {
 296         u32     exclusive;
 297
 298         if (!(p = nlm4_decode_cookie(p, &argp->cookie)))
 299                 return 0;
 300         argp->block = ntohl(*p++);
 301         exclusive = ntohl(*p++);
 302         if (!(p = nlm4_decode_lock(p, &argp->lock)))
 303                 return 0;
 304         if (exclusive)
 305                 argp->lock.fl.fl_type = F_WRLCK;
 306         return xdr_argsize_check(rqstp, p);
 307 }
 308
 309 int
 310 nlm4svc_decode_unlockargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 311 {
 312         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 313          || !(p = nlm4_decode_lock(p, &argp->lock)))
 314                 return 0;
 315         argp->lock.fl.fl_type = F_UNLCK;
 316         return xdr_argsize_check(rqstp, p);
 317 }
 318
 319 int
 320 nlm4svc_decode_shareargs(struct svc_rqst *rqstp, u32 *p, nlm_args *argp)
 321 {
 322         struct nlm_lock *lock = &argp->lock;
 323         int             len;
 324
 325         memset(lock, 0, sizeof(*lock));
 326         locks_init_lock(&lock->fl);
 327         lock->fl.fl_pid = ~(u32) 0;
 328
 329         if (!(p = nlm4_decode_cookie(p, &argp->cookie))
 330          || !(p = xdr_decode_string(p, &lock->caller, &len, NLM_MAXSTRLEN))
 331          || !(p = nlm4_decode_fh(p, &lock->fh))
 332          || !(p = nlm4_decode_oh(p, &lock->oh)))
 333                 return 0;
 334         argp->fsm_mode = ntohl(*p++);
 335         argp->fsm_access = ntohl(*p++);
 336         return xdr_argsize_check(rqstp, p);
 337 }
 338
 339 int
 340 nlm4svc_encode_shareres(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 341 {
 342         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 343                 return 0;
 344         *p++ = resp->status;
 345         *p++ = xdr_zero;                /* sequence argument */
 346         return xdr_ressize_check(rqstp, p);
 347 }
 348
 349 int
 350 nlm4svc_encode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 351 {
 352         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 353                 return 0;
 354         *p++ = resp->status;
 355         return xdr_ressize_check(rqstp, p);
 356 }
 357
 358 int
 359 nlm4svc_decode_notify(struct svc_rqst *rqstp, u32 *p, struct nlm_args *argp)
 360 {
 361         struct nlm_lock *lock = &argp->lock;
 362         int             len;
 363
 364         if (!(p = xdr_decode_string(p, &lock->caller, &len, NLM_MAXSTRLEN)))
 365                 return 0;
 366         argp->state = ntohl(*p++);
 367         return xdr_argsize_check(rqstp, p);
 368 }
 369
 370 int
 371 nlm4svc_decode_reboot(struct svc_rqst *rqstp, u32 *p, struct nlm_reboot *argp)
 372 {
 373         if (!(p = xdr_decode_string(p, &argp->mon, &argp->len, SM_MAXSTRLEN)))
 374                 return 0;
 375         argp->state = ntohl(*p++);
 376         argp->addr = ntohl(*p++);
 377         return xdr_argsize_check(rqstp, p);
 378 }
 379
 380 int
 381 nlm4svc_decode_res(struct svc_rqst *rqstp, u32 *p, struct nlm_res *resp)
 382 {
 383         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 384                 return 0;
 385         resp->status = ntohl(*p++);
 386         return xdr_argsize_check(rqstp, p);
 387 }
 388
 389 int
 390 nlm4svc_decode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
 391 {
 392         return xdr_argsize_check(rqstp, p);
 393 }
 394
 395 int
 396 nlm4svc_encode_void(struct svc_rqst *rqstp, u32 *p, void *dummy)
 397 {
 398         return xdr_ressize_check(rqstp, p);
 399 }
 400
 401 /*
 402  * Now, the client side XDR functions
 403  */
 404 static int
 405 nlm4clt_encode_void(struct rpc_rqst *req, u32 *p, void *ptr)
 406 {
 407         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 408         return 0;
 409 }
 410
 411 static int
 412 nlm4clt_decode_void(struct rpc_rqst *req, u32 *p, void *ptr)
 413 {
 414         return 0;
 415 }
 416
 417 static int
 418 nlm4clt_encode_testargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 419 {
 420         struct nlm_lock *lock = &argp->lock;
 421
 422         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 423                 return -EIO;
 424         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 425         if (!(p = nlm4_encode_lock(p, lock)))
 426                 return -EIO;
 427         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 428         return 0;
 429 }
 430
 431 static int
 432 nlm4clt_decode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 433 {
 434         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 435                 return -EIO;
 436         resp->status = ntohl(*p++);
 437         if (resp->status == NLM_LCK_DENIED) {
 438                 struct file_lock        *fl = &resp->lock.fl;
 439                 u32                     excl;
 440                 s64                     start, end, len;
 441
 442                 memset(&resp->lock, 0, sizeof(resp->lock));
 443                 locks_init_lock(fl);
 444                 excl = ntohl(*p++);
 445                 fl->fl_pid = ntohl(*p++);
 446                 if (!(p = nlm4_decode_oh(p, &resp->lock.oh)))
 447                         return -EIO;
 448
 449                 fl->fl_flags = FL_POSIX;
 450                 fl->fl_type  = excl? F_WRLCK : F_RDLCK;
 451                 p = xdr_decode_hyper(p, &start);
 452                 p = xdr_decode_hyper(p, &len);
 453                 end = start + len - 1;
 454
 455                 fl->fl_start = s64_to_loff_t(start);
 456                 if (len == 0 || end < 0)
 457                         fl->fl_end = OFFSET_MAX;
 458                 else
 459                         fl->fl_end = s64_to_loff_t(end);
 460         }
 461         return 0;
 462 }
 463
 464
 465 static int
 466 nlm4clt_encode_lockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 467 {
 468         struct nlm_lock *lock = &argp->lock;
 469
 470         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 471                 return -EIO;
 472         *p++ = argp->block? xdr_one : xdr_zero;
 473         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 474         if (!(p = nlm4_encode_lock(p, lock)))
 475                 return -EIO;
 476         *p++ = argp->reclaim? xdr_one : xdr_zero;
 477         *p++ = htonl(argp->state);
 478         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 479         return 0;
 480 }
 481
 482 static int
 483 nlm4clt_encode_cancargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 484 {
 485         struct nlm_lock *lock = &argp->lock;
 486
 487         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 488                 return -EIO;
 489         *p++ = argp->block? xdr_one : xdr_zero;
 490         *p++ = (lock->fl.fl_type == F_WRLCK)? xdr_one : xdr_zero;
 491         if (!(p = nlm4_encode_lock(p, lock)))
 492                 return -EIO;
 493         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 494         return 0;
 495 }
 496
 497 static int
 498 nlm4clt_encode_unlockargs(struct rpc_rqst *req, u32 *p, nlm_args *argp)
 499 {
 500         struct nlm_lock *lock = &argp->lock;
 501
 502         if (!(p = nlm4_encode_cookie(p, &argp->cookie)))
 503                 return -EIO;
 504         if (!(p = nlm4_encode_lock(p, lock)))
 505                 return -EIO;
 506         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 507         return 0;
 508 }
 509
 510 static int
 511 nlm4clt_encode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 512 {
 513         if (!(p = nlm4_encode_cookie(p, &resp->cookie)))
 514                 return -EIO;
 515         *p++ = resp->status;
 516         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 517         return 0;
 518 }
 519
 520 static int
 521 nlm4clt_encode_testres(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 522 {
 523         if (!(p = nlm4_encode_testres(p, resp)))
 524                 return -EIO;
 525         req->rq_slen = xdr_adjust_iovec(req->rq_svec, p);
 526         return 0;
 527 }
 528
 529 static int
 530 nlm4clt_decode_res(struct rpc_rqst *req, u32 *p, struct nlm_res *resp)
 531 {
 532         if (!(p = nlm4_decode_cookie(p, &resp->cookie)))
 533                 return -EIO;
 534         resp->status = ntohl(*p++);
 535         return 0;
 536 }
 537
 538 /*
 539  * Buffer requirements for NLM
 540  */
 541 #define NLM4_void_sz            0
 542 #define NLM4_cookie_sz          3       /* 1 len , 2 data */
 543 #define NLM4_caller_sz          1+XDR_QUADLEN(NLM_MAXSTRLEN)
 544 #define NLM4_netobj_sz          1+XDR_QUADLEN(XDR_MAX_NETOBJ)
 545 /* #define NLM4_owner_sz                1+XDR_QUADLEN(NLM4_MAXOWNER) */
 546 #define NLM4_fhandle_sz         1+XDR_QUADLEN(NFS3_FHSIZE)
 547 #define NLM4_lock_sz            5+NLM4_caller_sz+NLM4_netobj_sz+NLM4_fhandle_sz
 548 #define NLM4_holder_sz          6+NLM4_netobj_sz
 549
 550 #define NLM4_testargs_sz        NLM4_cookie_sz+1+NLM4_lock_sz
 551 #define NLM4_lockargs_sz        NLM4_cookie_sz+4+NLM4_lock_sz
 552 #define NLM4_cancargs_sz        NLM4_cookie_sz+2+NLM4_lock_sz
 553 #define NLM4_unlockargs_sz      NLM4_cookie_sz+NLM4_lock_sz
 554
 555 #define NLM4_testres_sz         NLM4_cookie_sz+1+NLM4_holder_sz
 556 #define NLM4_res_sz             NLM4_cookie_sz+1
 557 #define NLM4_norep_sz           0
 558
 559 #ifndef MAX
 560 # define MAX(a,b)               (((a) > (b))? (a) : (b))
 561 #endif
 562
 563 /*
 564  * For NLM, a void procedure really returns nothing
 565  */
 566 #define nlm4clt_decode_norep    NULL
 567
 568 #define PROC(proc, argtype, restype)                            \
 569     { "nlm4_" #proc,                                            \
 570       (kxdrproc_t) nlm4clt_encode_##argtype,                    \
 571       (kxdrproc_t) nlm4clt_decode_##restype,                    \
 572       MAX(NLM4_##argtype##_sz, NLM4_##restype##_sz) << 2,       \
 573       0                                                         \
 574     }
 575
 576 static struct rpc_procinfo      nlm4_procedures[] = {
 577     PROC(null,          void,           void),
 578     PROC(test,          testargs,       testres),
 579     PROC(lock,          lockargs,       res),
 580     PROC(canc,          cancargs,       res),
 581     PROC(unlock,        unlockargs,     res),
 582     PROC(granted,       testargs,       res),
 583     PROC(test_msg,      testargs,       norep),
 584     PROC(lock_msg,      lockargs,       norep),
 585     PROC(canc_msg,      cancargs,       norep),
 586     PROC(unlock_msg,    unlockargs,     norep),
 587     PROC(granted_msg,   testargs,       norep),
 588     PROC(test_res,      testres,        norep),
 589     PROC(lock_res,      res,            norep),
 590     PROC(canc_res,      res,            norep),
 591     PROC(unlock_res,    res,            norep),
 592     PROC(granted_res,   res,            norep),
 593     PROC(undef,         void,           void),
 594     PROC(undef,         void,           void),
 595     PROC(undef,         void,           void),
 596     PROC(undef,         void,           void),
 597 #ifdef NLMCLNT_SUPPORT_SHARES
 598     PROC(share,         shareargs,      shareres),
 599     PROC(unshare,       shareargs,      shareres),
 600     PROC(nm_lock,       lockargs,       res),
 601     PROC(free_all,      notify,         void),
 602 #else
 603     PROC(undef,         void,           void),
 604     PROC(undef,         void,           void),
 605     PROC(undef,         void,           void),
 606     PROC(undef,         void,           void),
 607 #endif
 608 };
 609
 610 struct rpc_version      nlm_version4 = {
 611         4, 24, nlm4_procedures,
 612 };