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 __be32 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 __be32 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, lock->caller, lock->len)) 42 || (argp->monitor && 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 nlm_release_host(host); 62 if (error) 63 return error; 64 return nlm_lck_denied_nolocks; 65 } 66 67 /* 68 * NULL: Test for presence of service 69 */ 70 static __be32 71 nlm4svc_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) 72 { 73 dprintk("lockd: NULL called\n"); 74 return rpc_success; 75 } 76 77 /* 78 * TEST: Check for conflicting lock 79 */ 80 static __be32 81 nlm4svc_proc_test(struct svc_rqst *rqstp, struct nlm_args *argp, 82 struct nlm_res *resp) 83 { 84 struct nlm_host *host; 85 struct nlm_file *file; 86 __be32 rc = rpc_success; 87 88 dprintk("lockd: TEST4 called\n"); 89 resp->cookie = argp->cookie; 90 91 /* Obtain client and file */ 92 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 93 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 94 95 /* Now check for conflicting locks */ 96 resp->status = nlmsvc_testlock(rqstp, file, host, &argp->lock, &resp->lock, &resp->cookie); 97 if (resp->status == nlm_drop_reply) 98 rc = rpc_drop_reply; 99 else 100 dprintk("lockd: TEST4 status %d\n", ntohl(resp->status)); 101 102 nlm_release_host(host); 103 nlm_release_file(file); 104 return rc; 105 } 106 107 static __be32 108 nlm4svc_proc_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 109 struct nlm_res *resp) 110 { 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 nlm_release_host(host); 145 nlm_release_file(file); 146 return rc; 147 } 148 149 static __be32 150 nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 151 struct nlm_res *resp) 152 { 153 struct nlm_host *host; 154 struct nlm_file *file; 155 156 dprintk("lockd: CANCEL called\n"); 157 158 resp->cookie = argp->cookie; 159 160 /* Don't accept requests during grace period */ 161 if (locks_in_grace()) { 162 resp->status = nlm_lck_denied_grace_period; 163 return rpc_success; 164 } 165 166 /* Obtain client and file */ 167 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 168 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 169 170 /* Try to cancel request. */ 171 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 172 173 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 174 nlm_release_host(host); 175 nlm_release_file(file); 176 return rpc_success; 177 } 178 179 /* 180 * UNLOCK: release a lock 181 */ 182 static __be32 183 nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 184 struct nlm_res *resp) 185 { 186 struct nlm_host *host; 187 struct nlm_file *file; 188 189 dprintk("lockd: UNLOCK called\n"); 190 191 resp->cookie = argp->cookie; 192 193 /* Don't accept new lock requests during grace period */ 194 if (locks_in_grace()) { 195 resp->status = nlm_lck_denied_grace_period; 196 return rpc_success; 197 } 198 199 /* Obtain client and file */ 200 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 201 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 202 203 /* Now try to remove the lock */ 204 resp->status = nlmsvc_unlock(file, &argp->lock); 205 206 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 207 nlm_release_host(host); 208 nlm_release_file(file); 209 return rpc_success; 210 } 211 212 /* 213 * GRANTED: A server calls us to tell that a process' lock request 214 * was granted 215 */ 216 static __be32 217 nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 218 struct nlm_res *resp) 219 { 220 resp->cookie = argp->cookie; 221 222 dprintk("lockd: GRANTED called\n"); 223 resp->status = nlmclnt_grant(svc_addr(rqstp), &argp->lock); 224 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 225 return rpc_success; 226 } 227 228 /* 229 * This is the generic lockd callback for async RPC calls 230 */ 231 static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 232 { 233 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 234 -task->tk_status); 235 } 236 237 static void nlm4svc_callback_release(void *data) 238 { 239 lock_kernel(); 240 nlm_release_call(data); 241 unlock_kernel(); 242 } 243 244 static const struct rpc_call_ops nlm4svc_callback_ops = { 245 .rpc_call_done = nlm4svc_callback_exit, 246 .rpc_release = nlm4svc_callback_release, 247 }; 248 249 /* 250 * `Async' versions of the above service routines. They aren't really, 251 * because we send the callback before the reply proper. I hope this 252 * doesn't break any clients. 253 */ 254 static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 255 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 256 { 257 struct nlm_host *host; 258 struct nlm_rqst *call; 259 __be32 stat; 260 261 host = nlmsvc_lookup_host(rqstp, 262 argp->lock.caller, 263 argp->lock.len); 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 __be32 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 __be32 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 __be32 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 __be32 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 __be32 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 __be32 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 (locks_in_grace() && !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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32 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 (locks_in_grace()) { 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 resp->status == nlm_drop_reply ? rpc_drop_reply :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 __be32 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 __be32 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 __be32 419 nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 420 void *resp) 421 { 422 struct sockaddr_in saddr; 423 424 dprintk("lockd: SM_NOTIFY called\n"); 425 426 if (!nlm_privileged_requester(rqstp)) { 427 char buf[RPC_MAX_ADDRBUFLEN]; 428 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 429 svc_print_addr(rqstp, buf, sizeof(buf))); 430 return rpc_system_err; 431 } 432 433 /* Obtain the host pointer for this NFS server and try to 434 * reclaim all locks we hold on this server. 435 */ 436 memset(&saddr, 0, sizeof(saddr)); 437 saddr.sin_family = AF_INET; 438 saddr.sin_addr.s_addr = argp->addr; 439 nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); 440 441 return rpc_success; 442 } 443 444 /* 445 * client sent a GRANTED_RES, let's remove the associated block 446 */ 447 static __be32 448 nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 449 void *resp) 450 { 451 if (!nlmsvc_ops) 452 return rpc_success; 453 454 dprintk("lockd: GRANTED_RES called\n"); 455 456 nlmsvc_grant_reply(&argp->cookie, argp->status); 457 return rpc_success; 458 } 459 460 461 /* 462 * NLM Server procedures. 463 */ 464 465 #define nlm4svc_encode_norep nlm4svc_encode_void 466 #define nlm4svc_decode_norep nlm4svc_decode_void 467 #define nlm4svc_decode_testres nlm4svc_decode_void 468 #define nlm4svc_decode_lockres nlm4svc_decode_void 469 #define nlm4svc_decode_unlockres nlm4svc_decode_void 470 #define nlm4svc_decode_cancelres nlm4svc_decode_void 471 #define nlm4svc_decode_grantedres nlm4svc_decode_void 472 473 #define nlm4svc_proc_none nlm4svc_proc_null 474 #define nlm4svc_proc_test_res nlm4svc_proc_null 475 #define nlm4svc_proc_lock_res nlm4svc_proc_null 476 #define nlm4svc_proc_cancel_res nlm4svc_proc_null 477 #define nlm4svc_proc_unlock_res nlm4svc_proc_null 478 479 struct nlm_void { int dummy; }; 480 481 #define PROC(name, xargt, xrest, argt, rest, respsize) \ 482 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 483 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 484 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 485 .pc_release = NULL, \ 486 .pc_argsize = sizeof(struct nlm_##argt), \ 487 .pc_ressize = sizeof(struct nlm_##rest), \ 488 .pc_xdrressize = respsize, \ 489 } 490 #define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 491 #define No (1+1024/4) /* netobj */ 492 #define St 1 /* status */ 493 #define Rg 4 /* range (offset + length) */ 494 struct svc_procedure nlmsvc_procedures4[] = { 495 PROC(null, void, void, void, void, 1), 496 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 497 PROC(lock, lockargs, res, args, res, Ck+St), 498 PROC(cancel, cancargs, res, args, res, Ck+St), 499 PROC(unlock, unlockargs, res, args, res, Ck+St), 500 PROC(granted, testargs, res, args, res, Ck+St), 501 PROC(test_msg, testargs, norep, args, void, 1), 502 PROC(lock_msg, lockargs, norep, args, void, 1), 503 PROC(cancel_msg, cancargs, norep, args, void, 1), 504 PROC(unlock_msg, unlockargs, norep, args, void, 1), 505 PROC(granted_msg, testargs, norep, args, void, 1), 506 PROC(test_res, testres, norep, res, void, 1), 507 PROC(lock_res, lockres, norep, res, void, 1), 508 PROC(cancel_res, cancelres, norep, res, void, 1), 509 PROC(unlock_res, unlockres, norep, res, void, 1), 510 PROC(granted_res, res, norep, res, void, 1), 511 /* statd callback */ 512 PROC(sm_notify, reboot, void, reboot, void, 1), 513 PROC(none, void, void, void, void, 0), 514 PROC(none, void, void, void, void, 0), 515 PROC(none, void, void, void, void, 0), 516 PROC(share, shareargs, shareres, args, res, Ck+St+1), 517 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 518 PROC(nm_lock, lockargs, res, args, res, Ck+St), 519 PROC(free_all, notify, void, args, void, 1), 520 521 }; 522