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