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