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/lockd/lockd.h> 13 #include <linux/lockd/share.h> 14 #include <linux/sunrpc/svc_xprt.h> 15 16 #define NLMDBG_FACILITY NLMDBG_CLIENT 17 18 /* 19 * Obtain client and file from arguments 20 */ 21 static __be32 22 nlm4svc_retrieve_args(struct svc_rqst *rqstp, struct nlm_args *argp, 23 struct nlm_host **hostp, struct nlm_file **filp) 24 { 25 struct nlm_host *host = NULL; 26 struct nlm_file *file = NULL; 27 struct nlm_lock *lock = &argp->lock; 28 __be32 error = 0; 29 30 /* nfsd callbacks must have been installed for this procedure */ 31 if (!nlmsvc_ops) 32 return nlm_lck_denied_nolocks; 33 34 /* Obtain host handle */ 35 if (!(host = nlmsvc_lookup_host(rqstp, lock->caller, lock->len)) 36 || (argp->monitor && nsm_monitor(host) < 0)) 37 goto no_locks; 38 *hostp = host; 39 40 /* Obtain file pointer. Not used by FREE_ALL call. */ 41 if (filp != NULL) { 42 if ((error = nlm_lookup_file(rqstp, &file, &lock->fh)) != 0) 43 goto no_locks; 44 *filp = file; 45 46 /* Set up the missing parts of the file_lock structure */ 47 lock->fl.fl_file = file->f_file; 48 lock->fl.fl_owner = (fl_owner_t) host; 49 lock->fl.fl_lmops = &nlmsvc_lock_operations; 50 } 51 52 return 0; 53 54 no_locks: 55 nlmsvc_release_host(host); 56 if (error) 57 return error; 58 return nlm_lck_denied_nolocks; 59 } 60 61 /* 62 * NULL: Test for presence of service 63 */ 64 static __be32 65 nlm4svc_proc_null(struct svc_rqst *rqstp) 66 { 67 dprintk("lockd: NULL called\n"); 68 return rpc_success; 69 } 70 71 /* 72 * TEST: Check for conflicting lock 73 */ 74 static __be32 75 __nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_res *resp) 76 { 77 struct nlm_args *argp = rqstp->rq_argp; 78 struct nlm_host *host; 79 struct nlm_file *file; 80 __be32 rc = rpc_success; 81 82 dprintk("lockd: TEST4 called\n"); 83 resp->cookie = argp->cookie; 84 85 /* Obtain client and file */ 86 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 87 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 88 89 /* Now check for conflicting locks */ 90 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie); 91 if (resp->status == nlm_drop_reply) 92 rc = rpc_drop_reply; 93 else 94 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 95 96 nlmsvc_release_host(host); 97 nlm_release_file(file); 98 return rc; 99 } 100 101 static __be32 102 nlm4svc_proc_test(struct svc_rqst *rqstp) 103 { 104 return __nlm4svc_proc_test(rqstp, rqstp->rq_resp); 105 } 106 107 static __be32 108 __nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_res *resp) 109 { 110 struct nlm_args *argp = rqstp->rq_argp; 111 struct nlm_host *host; 112 struct nlm_file *file; 113 __be32 rc = rpc_success; 114 115 dprintk("lockd: LOCK called\n"); 116 117 resp->cookie = argp->cookie; 118 119 /* Obtain client and file */ 120 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 121 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 122 123 #if 0 124 /* If supplied state doesn't match current state, we assume it's 125 * an old request that time-warped somehow. Any error return would 126 * do in this case because it's irrelevant anyway. 127 * 128 * NB: We don't retrieve the remote host's state yet. 129 */ 130 if (host->h_nsmstate && host->h_nsmstate != argp->state) { 131 resp->status = nlm_lck_denied_nolocks; 132 } else 133 #endif 134 135 /* Now try to lock the file */ 136 resp->status = nlmsvc_lock(rqstp, file, host, &argp->lock, 137 argp->block, &argp->cookie, 138 argp->reclaim); 139 if (resp->status == nlm_drop_reply) 140 rc = rpc_drop_reply; 141 else 142 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 143 144 nlmsvc_release_host(host); 145 nlm_release_file(file); 146 return rc; 147 } 148 149 static __be32 150 nlm4svc_proc_lock(struct svc_rqst *rqstp) 151 { 152 return __nlm4svc_proc_lock(rqstp, rqstp->rq_resp); 153 } 154 155 static __be32 156 __nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_res *resp) 157 { 158 struct nlm_args *argp = rqstp->rq_argp; 159 struct nlm_host *host; 160 struct nlm_file *file; 161 162 dprintk("lockd: CANCEL called\n"); 163 164 resp->cookie = argp->cookie; 165 166 /* Don't accept requests during grace period */ 167 if (locks_in_grace(SVC_NET(rqstp))) { 168 resp->status = nlm_lck_denied_grace_period; 169 return rpc_success; 170 } 171 172 /* Obtain client and file */ 173 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 174 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 175 176 /* Try to cancel request. */ 177 resp->status = nlmsvc_cancel_blocked(SVC_NET(rqstp), file, &argp->lock); 178 179 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 180 nlmsvc_release_host(host); 181 nlm_release_file(file); 182 return rpc_success; 183 } 184 185 static __be32 186 nlm4svc_proc_cancel(struct svc_rqst *rqstp) 187 { 188 return __nlm4svc_proc_cancel(rqstp, rqstp->rq_resp); 189 } 190 191 /* 192 * UNLOCK: release a lock 193 */ 194 static __be32 195 __nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_res *resp) 196 { 197 struct nlm_args *argp = rqstp->rq_argp; 198 struct nlm_host *host; 199 struct nlm_file *file; 200 201 dprintk("lockd: UNLOCK called\n"); 202 203 resp->cookie = argp->cookie; 204 205 /* Don't accept new lock requests during grace period */ 206 if (locks_in_grace(SVC_NET(rqstp))) { 207 resp->status = nlm_lck_denied_grace_period; 208 return rpc_success; 209 } 210 211 /* Obtain client and file */ 212 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 213 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 214 215 /* Now try to remove the lock */ 216 resp->status = nlmsvc_unlock(SVC_NET(rqstp), file, &argp->lock); 217 218 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 219 nlmsvc_release_host(host); 220 nlm_release_file(file); 221 return rpc_success; 222 } 223 224 static __be32 225 nlm4svc_proc_unlock(struct svc_rqst *rqstp) 226 { 227 return __nlm4svc_proc_unlock(rqstp, rqstp->rq_resp); 228 } 229 230 /* 231 * GRANTED: A server calls us to tell that a process' lock request 232 * was granted 233 */ 234 static __be32 235 __nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_res *resp) 236 { 237 struct nlm_args *argp = rqstp->rq_argp; 238 239 resp->cookie = argp->cookie; 240 241 dprintk("lockd: GRANTED called\n"); 242 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 243 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 244 return rpc_success; 245 } 246 247 static __be32 248 nlm4svc_proc_granted(struct svc_rqst *rqstp) 249 { 250 return __nlm4svc_proc_granted(rqstp, rqstp->rq_resp); 251 } 252 253 /* 254 * This is the generic lockd callback for async RPC calls 255 */ 256 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 257 { 258 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 259 -task->tk_status); 260 } 261 262 static void nlm4svc_callback_release(void *data) 263 { 264 nlmsvc_release_call(data); 265 } 266 267 static const struct rpc_call_ops nlm4svc_callback_ops = { 268 .rpc_call_done = nlm4svc_callback_exit, 269 .rpc_release = nlm4svc_callback_release, 270 }; 271 272 /* 273 * `Async' versions of the above service routines. They aren't really, 274 * because we send the callback before the reply proper. I hope this 275 * doesn't break any clients. 276 */ 277 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, 278 __be32 (*func)(struct svc_rqst *, struct nlm_res *)) 279 { 280 struct nlm_args *argp = rqstp->rq_argp; 281 struct nlm_host *host; 282 struct nlm_rqst *call; 283 __be32 stat; 284 285 host = nlmsvc_lookup_host(rqstp, 286 argp->lock.caller, 287 argp->lock.len); 288 if (host == NULL) 289 return rpc_system_err; 290 291 call = nlm_alloc_call(host); 292 nlmsvc_release_host(host); 293 if (call == NULL) 294 return rpc_system_err; 295 296 stat = func(rqstp, &call->a_res); 297 if (stat != 0) { 298 nlmsvc_release_call(call); 299 return stat; 300 } 301 302 call->a_flags = RPC_TASK_ASYNC; 303 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 304 return rpc_system_err; 305 return rpc_success; 306 } 307 308 static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp) 309 { 310 dprintk("lockd: TEST_MSG called\n"); 311 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, __nlm4svc_proc_test); 312 } 313 314 static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp) 315 { 316 dprintk("lockd: LOCK_MSG called\n"); 317 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, __nlm4svc_proc_lock); 318 } 319 320 static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp) 321 { 322 dprintk("lockd: CANCEL_MSG called\n"); 323 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, __nlm4svc_proc_cancel); 324 } 325 326 static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp) 327 { 328 dprintk("lockd: UNLOCK_MSG called\n"); 329 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, __nlm4svc_proc_unlock); 330 } 331 332 static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp) 333 { 334 dprintk("lockd: GRANTED_MSG called\n"); 335 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, __nlm4svc_proc_granted); 336 } 337 338 /* 339 * SHARE: create a DOS share or alter existing share. 340 */ 341 static __be32 342 nlm4svc_proc_share(struct svc_rqst *rqstp) 343 { 344 struct nlm_args *argp = rqstp->rq_argp; 345 struct nlm_res *resp = rqstp->rq_resp; 346 struct nlm_host *host; 347 struct nlm_file *file; 348 349 dprintk("lockd: SHARE called\n"); 350 351 resp->cookie = argp->cookie; 352 353 /* Don't accept new lock requests during grace period */ 354 if (locks_in_grace(SVC_NET(rqstp)) && !argp->reclaim) { 355 resp->status = nlm_lck_denied_grace_period; 356 return rpc_success; 357 } 358 359 /* Obtain client and file */ 360 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 361 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 362 363 /* Now try to create the share */ 364 resp->status = nlmsvc_share_file(host, file, argp); 365 366 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 367 nlmsvc_release_host(host); 368 nlm_release_file(file); 369 return rpc_success; 370 } 371 372 /* 373 * UNSHARE: Release a DOS share. 374 */ 375 static __be32 376 nlm4svc_proc_unshare(struct svc_rqst *rqstp) 377 { 378 struct nlm_args *argp = rqstp->rq_argp; 379 struct nlm_res *resp = rqstp->rq_resp; 380 struct nlm_host *host; 381 struct nlm_file *file; 382 383 dprintk("lockd: UNSHARE called\n"); 384 385 resp->cookie = argp->cookie; 386 387 /* Don't accept requests during grace period */ 388 if (locks_in_grace(SVC_NET(rqstp))) { 389 resp->status = nlm_lck_denied_grace_period; 390 return rpc_success; 391 } 392 393 /* Obtain client and file */ 394 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 395 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 396 397 /* Now try to lock the file */ 398 resp->status = nlmsvc_unshare_file(host, file, argp); 399 400 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 401 nlmsvc_release_host(host); 402 nlm_release_file(file); 403 return rpc_success; 404 } 405 406 /* 407 * NM_LOCK: Create an unmonitored lock 408 */ 409 static __be32 410 nlm4svc_proc_nm_lock(struct svc_rqst *rqstp) 411 { 412 struct nlm_args *argp = rqstp->rq_argp; 413 414 dprintk("lockd: NM_LOCK called\n"); 415 416 argp->monitor = 0; /* just clean the monitor flag */ 417 return nlm4svc_proc_lock(rqstp); 418 } 419 420 /* 421 * FREE_ALL: Release all locks and shares held by client 422 */ 423 static __be32 424 nlm4svc_proc_free_all(struct svc_rqst *rqstp) 425 { 426 struct nlm_args *argp = rqstp->rq_argp; 427 struct nlm_host *host; 428 429 /* Obtain client */ 430 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 431 return rpc_success; 432 433 nlmsvc_free_host_resources(host); 434 nlmsvc_release_host(host); 435 return rpc_success; 436 } 437 438 /* 439 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 440 */ 441 static __be32 442 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp) 443 { 444 struct nlm_reboot *argp = rqstp->rq_argp; 445 446 dprintk("lockd: SM_NOTIFY called\n"); 447 448 if (!nlm_privileged_requester(rqstp)) { 449 char buf[RPC_MAX_ADDRBUFLEN]; 450 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 451 svc_print_addr(rqstp, buf, sizeof(buf))); 452 return rpc_system_err; 453 } 454 455 nlm_host_rebooted(SVC_NET(rqstp), argp); 456 return rpc_success; 457 } 458 459 /* 460 * client sent a GRANTED_RES, let's remove the associated block 461 */ 462 static __be32 463 nlm4svc_proc_granted_res(struct svc_rqst *rqstp) 464 { 465 struct nlm_res *argp = rqstp->rq_argp; 466 467 if (!nlmsvc_ops) 468 return rpc_success; 469 470 dprintk("lockd: GRANTED_RES called\n"); 471 472 nlmsvc_grant_reply(&argp->cookie, argp->status); 473 return rpc_success; 474 } 475 476 477 /* 478 * NLM Server procedures. 479 */ 480 481 #define nlm4svc_encode_norep nlm4svc_encode_void 482 #define nlm4svc_decode_norep nlm4svc_decode_void 483 #define nlm4svc_decode_testres nlm4svc_decode_void 484 #define nlm4svc_decode_lockres nlm4svc_decode_void 485 #define nlm4svc_decode_unlockres nlm4svc_decode_void 486 #define nlm4svc_decode_cancelres nlm4svc_decode_void 487 #define nlm4svc_decode_grantedres nlm4svc_decode_void 488 489 #define nlm4svc_proc_none nlm4svc_proc_null 490 #define nlm4svc_proc_test_res nlm4svc_proc_null 491 #define nlm4svc_proc_lock_res nlm4svc_proc_null 492 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 493 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 494 495 struct nlm_void { int dummy; }; 496 497 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 498 { .pc_func = nlm4svc_proc_##name, \ 499 .pc_decode = nlm4svc_decode_##xargt, \ 500 .pc_encode = nlm4svc_encode_##xrest, \ 501 .pc_release = NULL, \ 502 .pc_argsize = sizeof(struct nlm_##argt), \ 503 .pc_ressize = sizeof(struct nlm_##rest), \ 504 .pc_xdrressize = respsize, \ 505 } 506 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 507 #define No (1+1024/4) /* netobj */ 508 #define St 1 /* status */ 509 #define Rg 4 /* range (offset + length) */ 510 const struct svc_procedure nlmsvc_procedures4[] = { 511 PROC(null, void, void, void, void, 1), 512 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 513 PROC(lock, lockargs, res, args, res, Ck+St), 514 PROC(cancel, cancargs, res, args, res, Ck+St), 515 PROC(unlock, unlockargs, res, args, res, Ck+St), 516 PROC(granted, testargs, res, args, res, Ck+St), 517 PROC(test_msg, testargs, norep, args, void, 1), 518 PROC(lock_msg, lockargs, norep, args, void, 1), 519 PROC(cancel_msg, cancargs, norep, args, void, 1), 520 PROC(unlock_msg, unlockargs, norep, args, void, 1), 521 PROC(granted_msg, testargs, norep, args, void, 1), 522 PROC(test_res, testres, norep, res, void, 1), 523 PROC(lock_res, lockres, norep, res, void, 1), 524 PROC(cancel_res, cancelres, norep, res, void, 1), 525 PROC(unlock_res, unlockres, norep, res, void, 1), 526 PROC(granted_res, res, norep, res, void, 1), 527 /* statd callback */ 528 PROC(sm_notify, reboot, void, reboot, void, 1), 529 PROC(none, void, void, void, void, 0), 530 PROC(none, void, void, void, void, 0), 531 PROC(none, void, void, void, void, 0), 532 PROC(share, shareargs, shareres, args, res, Ck+St+1), 533 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 534 PROC(nm_lock, lockargs, res, args, res, Ck+St), 535 PROC(free_all, notify, void, args, void, 1), 536 537 }; 538