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