fs/lockd/svc4proc.c

   1 /*
   2  * linux/fs/lockd/svc4proc.c
   3  *
   4  * Lockd server procedures. We don't implement the NLM_*_RES
   5  * procedures because we don't use the async procedures.
   6  *
   7  * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
   8  */
   9
  10 #include <linux/types.h>
  11 #include <linux/time.h>
  12 #include <linux/slab.h>
  13 #include <linux/in.h>
  14 #include <linux/sunrpc/svc.h>
  15 #include <linux/sunrpc/clnt.h>
  16 #include <linux/nfsd/nfsd.h>
  17 #include <linux/lockd/lockd.h>
  18 #include <linux/lockd/share.h>
  19 #include <linux/lockd/sm_inter.h>
  20
  21
  22 #define NLMDBG_FACILITY         NLMDBG_CLIENT
  23
  24 /*
  25  * Obtain client and file from arguments
  26  */
  27 static u32
  28 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp,
  29                         struct nlm_host **hostp, struct nlm_file **filp)
  30 {
  31         struct nlm_host         *host = NULL;
  32         struct nlm_file         *file = NULL;
  33         struct nlm_lock         *lock = &argp->lock;
  34         u32                     error = 0;
  35
  36         /* nfsd callbacks must have been installed for this procedure */
  37         if (!nlmsvc_ops)
  38                 return nlm_lck_denied_nolocks;
  39
  40         /* Obtain host handle */
  41         if (!(host = nlmsvc_lookup_host(rqstp))
  42          || (argp->monitor && !host->h_monitored && nsm_monitor(host) < 0))
  43                 goto no_locks;
  44         *hostp = host;
  45
  46         /* Obtain file pointer. Not used by FREE_ALL call. */
  47         if (filp != NULL) {
  48                 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0)
  49                         goto no_locks;
  50                 *filp = file;
  51
  52                 /* Set up the missing parts of the file_lock structure */
  53                 lock->fl.fl_file  = file->f_file;
  54                 lock->fl.fl_owner = (fl_owner_t) host;
  55                 lock->fl.fl_lmops = &nlmsvc_lock_operations;
  56         }
  57
  58         return 0;
  59
  60 no_locks:
  61         if (host)
  62                 nlm_release_host(host);
  63         if (error)
  64                 return error;
  65         return nlm_lck_denied_nolocks;
  66 }
  67
  68 /*
  69  * NULL: Test for presence of service
  70  */
  71 static int
  72 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp)
  73 {
  74         dprintk("lockd: NULL          called\n");
  75         return rpc_success;
  76 }
  77
  78 /*
  79  * TEST: Check for conflicting lock
  80  */
  81 static int
  82 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp,
  83                                          struct nlm_res  *resp)
  84 {
  85         struct nlm_host *host;
  86         struct nlm_file *file;
  87
  88         dprintk("lockd: TEST4        called\n");
  89         resp->cookie = argp->cookie;
  90
  91         /* Don't accept test requests during grace period */
  92         if (nlmsvc_grace_period) {
  93                 resp->status = nlm_lck_denied_grace_period;
  94                 return rpc_success;
  95         }
  96
  97         /* Obtain client and file */
  98         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
  99                 return rpc_success;
 100
 101         /* Now check for conflicting locks */
 102         resp->status = nlmsvc_testlock(file, &argp->lock, &resp->lock);
 103
 104         dprintk("lockd: TEST4          status %d\n", ntohl(resp->status));
 105         nlm_release_host(host);
 106         nlm_release_file(file);
 107         return rpc_success;
 108 }
 109
 110 static int
 111 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 112                                          struct nlm_res  *resp)
 113 {
 114         struct nlm_host *host;
 115         struct nlm_file *file;
 116
 117         dprintk("lockd: LOCK          called\n");
 118
 119         resp->cookie = argp->cookie;
 120
 121         /* Don't accept new lock requests during grace period */
 122         if (nlmsvc_grace_period && !argp->reclaim) {
 123                 resp->status = nlm_lck_denied_grace_period;
 124                 return rpc_success;
 125         }
 126
 127         /* Obtain client and file */
 128         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 129                 return rpc_success;
 130
 131 #if 0
 132         /* If supplied state doesn't match current state, we assume it's
 133          * an old request that time-warped somehow. Any error return would
 134          * do in this case because it's irrelevant anyway.
 135          *
 136          * NB: We don't retrieve the remote host's state yet.
 137          */
 138         if (host->h_nsmstate && host->h_nsmstate != argp->state) {
 139                 resp->status = nlm_lck_denied_nolocks;
 140         } else
 141 #endif
 142
 143         /* Now try to lock the file */
 144         resp->status = nlmsvc_lock(rqstp, file, &argp->lock,
 145                                         argp->block, &argp->cookie);
 146
 147         dprintk("lockd: LOCK          status %d\n", ntohl(resp->status));
 148         nlm_release_host(host);
 149         nlm_release_file(file);
 150         return rpc_success;
 151 }
 152
 153 static int
 154 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp,
 155                                            struct nlm_res  *resp)
 156 {
 157         struct nlm_host *host;
 158         struct nlm_file *file;
 159
 160         dprintk("lockd: CANCEL        called\n");
 161
 162         resp->cookie = argp->cookie;
 163
 164         /* Don't accept requests during grace period */
 165         if (nlmsvc_grace_period) {
 166                 resp->status = nlm_lck_denied_grace_period;
 167                 return rpc_success;
 168         }
 169
 170         /* Obtain client and file */
 171         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 172                 return rpc_success;
 173
 174         /* Try to cancel request. */
 175         resp->status = nlmsvc_cancel_blocked(file, &argp->lock);
 176
 177         dprintk("lockd: CANCEL        status %d\n", ntohl(resp->status));
 178         nlm_release_host(host);
 179         nlm_release_file(file);
 180         return rpc_success;
 181 }
 182
 183 /*
 184  * UNLOCK: release a lock
 185  */
 186 static int
 187 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp,
 188                                            struct nlm_res  *resp)
 189 {
 190         struct nlm_host *host;
 191         struct nlm_file *file;
 192
 193         dprintk("lockd: UNLOCK        called\n");
 194
 195         resp->cookie = argp->cookie;
 196
 197         /* Don't accept new lock requests during grace period */
 198         if (nlmsvc_grace_period) {
 199                 resp->status = nlm_lck_denied_grace_period;
 200                 return rpc_success;
 201         }
 202
 203         /* Obtain client and file */
 204         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 205                 return rpc_success;
 206
 207         /* Now try to remove the lock */
 208         resp->status = nlmsvc_unlock(file, &argp->lock);
 209
 210         dprintk("lockd: UNLOCK        status %d\n", ntohl(resp->status));
 211         nlm_release_host(host);
 212         nlm_release_file(file);
 213         return rpc_success;
 214 }
 215
 216 /*
 217  * GRANTED: A server calls us to tell that a process' lock request
 218  * was granted
 219  */
 220 static int
 221 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp,
 222                                             struct nlm_res  *resp)
 223 {
 224         resp->cookie = argp->cookie;
 225
 226         dprintk("lockd: GRANTED       called\n");
 227         resp->status = nlmclnt_grant(&rqstp->rq_addr, &argp->lock);
 228         dprintk("lockd: GRANTED       status %d\n", ntohl(resp->status));
 229         return rpc_success;
 230 }
 231
 232 /*
 233  * This is the generic lockd callback for async RPC calls
 234  */
 235 static void nlm4svc_callback_exit(struct rpc_task *task, void *data)
 236 {
 237         dprintk("lockd: %4d callback returned %d\n", task->tk_pid,
 238                         -task->tk_status);
 239 }
 240
 241 static void nlm4svc_callback_release(void *data)
 242 {
 243         nlm_release_call(data);
 244 }
 245
 246 static const struct rpc_call_ops nlm4svc_callback_ops = {
 247         .rpc_call_done = nlm4svc_callback_exit,
 248         .rpc_release = nlm4svc_callback_release,
 249 };
 250
 251 /*
 252  * `Async' versions of the above service routines. They aren't really,
 253  * because we send the callback before the reply proper. I hope this
 254  * doesn't break any clients.
 255  */
 256 static int nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp,
 257                 int (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res  *))
 258 {
 259         struct nlm_host *host;
 260         struct nlm_rqst *call;
 261         int stat;
 262
 263         host = nlmsvc_lookup_host(rqstp);
 264         if (host == NULL)
 265                 return rpc_system_err;
 266
 267         call = nlm_alloc_call(host);
 268         if (call == NULL)
 269                 return rpc_system_err;
 270
 271         stat = func(rqstp, argp, &call->a_res);
 272         if (stat != 0) {
 273                 nlm_release_call(call);
 274                 return stat;
 275         }
 276
 277         call->a_flags = RPC_TASK_ASYNC;
 278         if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0)
 279                 return rpc_system_err;
 280         return rpc_success;
 281 }
 282
 283 static int nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 284                                              void            *resp)
 285 {
 286         dprintk("lockd: TEST_MSG      called\n");
 287         return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test);
 288 }
 289
 290 static int nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 291                                              void            *resp)
 292 {
 293         dprintk("lockd: LOCK_MSG      called\n");
 294         return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock);
 295 }
 296
 297 static int nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 298                                                void            *resp)
 299 {
 300         dprintk("lockd: CANCEL_MSG    called\n");
 301         return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel);
 302 }
 303
 304 static int nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 305                                                void            *resp)
 306 {
 307         dprintk("lockd: UNLOCK_MSG    called\n");
 308         return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock);
 309 }
 310
 311 static int nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp,
 312                                                 void            *resp)
 313 {
 314         dprintk("lockd: GRANTED_MSG   called\n");
 315         return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted);
 316 }
 317
 318 /*
 319  * SHARE: create a DOS share or alter existing share.
 320  */
 321 static int
 322 nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp,
 323                                           struct nlm_res  *resp)
 324 {
 325         struct nlm_host *host;
 326         struct nlm_file *file;
 327
 328         dprintk("lockd: SHARE         called\n");
 329
 330         resp->cookie = argp->cookie;
 331
 332         /* Don't accept new lock requests during grace period */
 333         if (nlmsvc_grace_period && !argp->reclaim) {
 334                 resp->status = nlm_lck_denied_grace_period;
 335                 return rpc_success;
 336         }
 337
 338         /* Obtain client and file */
 339         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 340                 return rpc_success;
 341
 342         /* Now try to create the share */
 343         resp->status = nlmsvc_share_file(host, file, argp);
 344
 345         dprintk("lockd: SHARE         status %d\n", ntohl(resp->status));
 346         nlm_release_host(host);
 347         nlm_release_file(file);
 348         return rpc_success;
 349 }
 350
 351 /*
 352  * UNSHARE: Release a DOS share.
 353  */
 354 static int
 355 nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp,
 356                                             struct nlm_res  *resp)
 357 {
 358         struct nlm_host *host;
 359         struct nlm_file *file;
 360
 361         dprintk("lockd: UNSHARE       called\n");
 362
 363         resp->cookie = argp->cookie;
 364
 365         /* Don't accept requests during grace period */
 366         if (nlmsvc_grace_period) {
 367                 resp->status = nlm_lck_denied_grace_period;
 368                 return rpc_success;
 369         }
 370
 371         /* Obtain client and file */
 372         if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file)))
 373                 return rpc_success;
 374
 375         /* Now try to lock the file */
 376         resp->status = nlmsvc_unshare_file(host, file, argp);
 377
 378         dprintk("lockd: UNSHARE       status %d\n", ntohl(resp->status));
 379         nlm_release_host(host);
 380         nlm_release_file(file);
 381         return rpc_success;
 382 }
 383
 384 /*
 385  * NM_LOCK: Create an unmonitored lock
 386  */
 387 static int
 388 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp,
 389                                             struct nlm_res  *resp)
 390 {
 391         dprintk("lockd: NM_LOCK       called\n");
 392
 393         argp->monitor = 0;              /* just clean the monitor flag */
 394         return nlm4svc_proc_lock(rqstp, argp, resp);
 395 }
 396
 397 /*
 398  * FREE_ALL: Release all locks and shares held by client
 399  */
 400 static int
 401 nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp,
 402                                              void            *resp)
 403 {
 404         struct nlm_host *host;
 405
 406         /* Obtain client */
 407         if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL))
 408                 return rpc_success;
 409
 410         nlmsvc_free_host_resources(host);
 411         nlm_release_host(host);
 412         return rpc_success;
 413 }
 414
 415 /*
 416  * SM_NOTIFY: private callback from statd (not part of official NLM proto)
 417  */
 418 static int
 419 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp,
 420                                               void              *resp)
 421 {
 422         struct sockaddr_in      saddr = rqstp->rq_addr;
 423         int                     vers = argp->vers;
 424         int                     prot = argp->proto >> 1;
 425
 426         struct nlm_host         *host;
 427
 428         dprintk("lockd: SM_NOTIFY     called\n");
 429         if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK)
 430          || ntohs(saddr.sin_port) >= 1024) {
 431                 printk(KERN_WARNING
 432                         "lockd: rejected NSM callback from %08x:%d\n",
 433                         ntohl(rqstp->rq_addr.sin_addr.s_addr),
 434                         ntohs(rqstp->rq_addr.sin_port));
 435                 return rpc_system_err;
 436         }
 437
 438         /* Obtain the host pointer for this NFS server and try to
 439          * reclaim all locks we hold on this server.
 440          */
 441         saddr.sin_addr.s_addr = argp->addr;
 442
 443         if ((argp->proto & 1)==0) {
 444                 if ((host = nlmclnt_lookup_host(&saddr, prot, vers)) != NULL) {
 445                         nlmclnt_recovery(host, argp->state);
 446                         nlm_release_host(host);
 447                 }
 448         } else {
 449                 /* If we run on an NFS server, delete all locks held by the client */
 450
 451                 if ((host = nlm_lookup_host(1, &saddr, prot, vers)) != NULL) {
 452                         nlmsvc_free_host_resources(host);
 453                         nlm_release_host(host);
 454                 }
 455         }
 456         return rpc_success;
 457 }
 458
 459 /*
 460  * client sent a GRANTED_RES, let's remove the associated block
 461  */
 462 static int
 463 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res  *argp,
 464                                                 void            *resp)
 465 {
 466         if (!nlmsvc_ops)
 467                 return rpc_success;
 468
 469         dprintk("lockd: GRANTED_RES   called\n");
 470
 471         nlmsvc_grant_reply(rqstp, &argp->cookie, argp->status);
 472         return rpc_success;
 473 }
 474
 475
 476 /*
 477  * NLM Server procedures.
 478  */
 479
 480 #define nlm4svc_encode_norep    nlm4svc_encode_void
 481 #define nlm4svc_decode_norep    nlm4svc_decode_void
 482 #define nlm4svc_decode_testres  nlm4svc_decode_void
 483 #define nlm4svc_decode_lockres  nlm4svc_decode_void
 484 #define nlm4svc_decode_unlockres        nlm4svc_decode_void
 485 #define nlm4svc_decode_cancelres        nlm4svc_decode_void
 486 #define nlm4svc_decode_grantedres       nlm4svc_decode_void
 487
 488 #define nlm4svc_proc_none       nlm4svc_proc_null
 489 #define nlm4svc_proc_test_res   nlm4svc_proc_null
 490 #define nlm4svc_proc_lock_res   nlm4svc_proc_null
 491 #define nlm4svc_proc_cancel_res nlm4svc_proc_null
 492 #define nlm4svc_proc_unlock_res nlm4svc_proc_null
 493
 494 struct nlm_void                 { int dummy; };
 495
 496 #define PROC(name, xargt, xrest, argt, rest, respsize)  \
 497  { .pc_func     = (svc_procfunc) nlm4svc_proc_##name,   \
 498    .pc_decode   = (kxdrproc_t) nlm4svc_decode_##xargt,  \
 499    .pc_encode   = (kxdrproc_t) nlm4svc_encode_##xrest,  \
 500    .pc_release  = NULL,                                 \
 501    .pc_argsize  = sizeof(struct nlm_##argt),            \
 502    .pc_ressize  = sizeof(struct nlm_##rest),            \
 503    .pc_xdrressize = respsize,                           \
 504  }
 505 #define Ck      (1+XDR_QUADLEN(NLM_MAXCOOKIELEN))       /* cookie */
 506 #define No      (1+1024/4)                              /* netobj */
 507 #define St      1                                       /* status */
 508 #define Rg      4                                       /* range (offset + length) */
 509 struct svc_procedure            nlmsvc_procedures4[] = {
 510   PROC(null,            void,           void,           void,   void, 1),
 511   PROC(test,            testargs,       testres,        args,   res, Ck+St+2+No+Rg),
 512   PROC(lock,            lockargs,       res,            args,   res, Ck+St),
 513   PROC(cancel,          cancargs,       res,            args,   res, Ck+St),
 514   PROC(unlock,          unlockargs,     res,            args,   res, Ck+St),
 515   PROC(granted,         testargs,       res,            args,   res, Ck+St),
 516   PROC(test_msg,        testargs,       norep,          args,   void, 1),
 517   PROC(lock_msg,        lockargs,       norep,          args,   void, 1),
 518   PROC(cancel_msg,      cancargs,       norep,          args,   void, 1),
 519   PROC(unlock_msg,      unlockargs,     norep,          args,   void, 1),
 520   PROC(granted_msg,     testargs,       norep,          args,   void, 1),
 521   PROC(test_res,        testres,        norep,          res,    void, 1),
 522   PROC(lock_res,        lockres,        norep,          res,    void, 1),
 523   PROC(cancel_res,      cancelres,      norep,          res,    void, 1),
 524   PROC(unlock_res,      unlockres,      norep,          res,    void, 1),
 525   PROC(granted_res,     res,            norep,          res,    void, 1),
 526   /* statd callback */
 527   PROC(sm_notify,       reboot,         void,           reboot, void, 1),
 528   PROC(none,            void,           void,           void,   void, 0),
 529   PROC(none,            void,           void,           void,   void, 0),
 530   PROC(none,            void,           void,           void,   void, 0),
 531   PROC(share,           shareargs,      shareres,       args,   res, Ck+St+1),
 532   PROC(unshare,         shareargs,      shareres,       args,   res, Ck+St+1),
 533   PROC(nm_lock,         lockargs,       res,            args,   res, Ck+St),
 534   PROC(free_all,        notify,         void,           args,   void, 1),
 535
 536 };