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