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 */ 27static __be32 28nlm4svc_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 60no_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 */ 71static __be32 72nlm4svc_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 */ 81static __be32 82nlm4svc_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 112static __be32 113nlm4svc_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; 132 133 134 /* Now try to lock the file */ 135 resp->status = nlmsvc_lock(rqstp, file, &argp->lock, 136 argp->block, &argp->cookie); 137 if (resp->status == nlm_drop_reply) 138 return rpc_drop_reply; 139 140 dprintk("lockd: LOCK status %d\n", ntohl(resp->status)); 141 nlm_release_host(host); 142 nlm_release_file(file); 143 return rpc_success; 144} 145 146static __be32 147nlm4svc_proc_cancel(struct svc_rqst *rqstp, struct nlm_args *argp, 148 struct nlm_res *resp) 149{ 150 struct nlm_host *host; 151 struct nlm_file *file; 152 153 dprintk("lockd: CANCEL called\n"); 154 155 resp->cookie = argp->cookie; 156 157 /* Don't accept requests during grace period */ 158 if (nlmsvc_grace_period) { 159 resp->status = nlm_lck_denied_grace_period; 160 return rpc_success; 161 } 162 163 /* Obtain client and file */ 164 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 165 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 166 167 /* Try to cancel request. */ 168 resp->status = nlmsvc_cancel_blocked(file, &argp->lock); 169 170 dprintk("lockd: CANCEL status %d\n", ntohl(resp->status)); 171 nlm_release_host(host); 172 nlm_release_file(file); 173 return rpc_success; 174} 175 176/* 177 * UNLOCK: release a lock 178 */ 179static __be32 180nlm4svc_proc_unlock(struct svc_rqst *rqstp, struct nlm_args *argp, 181 struct nlm_res *resp) 182{ 183 struct nlm_host *host; 184 struct nlm_file *file; 185 186 dprintk("lockd: UNLOCK called\n"); 187 188 resp->cookie = argp->cookie; 189 190 /* Don't accept new lock requests during grace period */ 191 if (nlmsvc_grace_period) { 192 resp->status = nlm_lck_denied_grace_period; 193 return rpc_success; 194 } 195 196 /* Obtain client and file */ 197 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 198 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 199 200 /* Now try to remove the lock */ 201 resp->status = nlmsvc_unlock(file, &argp->lock); 202 203 dprintk("lockd: UNLOCK status %d\n", ntohl(resp->status)); 204 nlm_release_host(host); 205 nlm_release_file(file); 206 return rpc_success; 207} 208 209/* 210 * GRANTED: A server calls us to tell that a process' lock request 211 * was granted 212 */ 213static __be32 214nlm4svc_proc_granted(struct svc_rqst *rqstp, struct nlm_args *argp, 215 struct nlm_res *resp) 216{ 217 resp->cookie = argp->cookie; 218 219 dprintk("lockd: GRANTED called\n"); 220 resp->status = nlmclnt_grant(svc_addr_in(rqstp), &argp->lock); 221 dprintk("lockd: GRANTED status %d\n", ntohl(resp->status)); 222 return rpc_success; 223} 224 225/* 226 * This is the generic lockd callback for async RPC calls 227 */ 228static void nlm4svc_callback_exit(struct rpc_task *task, void *data) 229{ 230 dprintk("lockd: %5u callback returned %d\n", task->tk_pid, 231 -task->tk_status); 232} 233 234static void nlm4svc_callback_release(void *data) 235{ 236 nlm_release_call(data); 237} 238 239static const struct rpc_call_ops nlm4svc_callback_ops = { 240 .rpc_call_done = nlm4svc_callback_exit, 241 .rpc_release = nlm4svc_callback_release, 242}; 243 244/* 245 * `Async' versions of the above service routines. They aren't really, 246 * because we send the callback before the reply proper. I hope this 247 * doesn't break any clients. 248 */ 249static __be32 nlm4svc_callback(struct svc_rqst *rqstp, u32 proc, struct nlm_args *argp, 250 __be32 (*func)(struct svc_rqst *, struct nlm_args *, struct nlm_res *)) 251{ 252 struct nlm_host *host; 253 struct nlm_rqst *call; 254 __be32 stat; 255 256 host = nlmsvc_lookup_host(rqstp, 257 argp->lock.caller, 258 argp->lock.len); 259 if (host == NULL) 260 return rpc_system_err; 261 262 call = nlm_alloc_call(host); 263 if (call == NULL) 264 return rpc_system_err; 265 266 stat = func(rqstp, argp, &call->a_res); 267 if (stat != 0) { 268 nlm_release_call(call); 269 return stat; 270 } 271 272 call->a_flags = RPC_TASK_ASYNC; 273 if (nlm_async_reply(call, proc, &nlm4svc_callback_ops) < 0) 274 return rpc_system_err; 275 return rpc_success; 276} 277 278static __be32 nlm4svc_proc_test_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 279 void *resp) 280{ 281 dprintk("lockd: TEST_MSG called\n"); 282 return nlm4svc_callback(rqstp, NLMPROC_TEST_RES, argp, nlm4svc_proc_test); 283} 284 285static __be32 nlm4svc_proc_lock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 286 void *resp) 287{ 288 dprintk("lockd: LOCK_MSG called\n"); 289 return nlm4svc_callback(rqstp, NLMPROC_LOCK_RES, argp, nlm4svc_proc_lock); 290} 291 292static __be32 nlm4svc_proc_cancel_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 293 void *resp) 294{ 295 dprintk("lockd: CANCEL_MSG called\n"); 296 return nlm4svc_callback(rqstp, NLMPROC_CANCEL_RES, argp, nlm4svc_proc_cancel); 297} 298 299static __be32 nlm4svc_proc_unlock_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 300 void *resp) 301{ 302 dprintk("lockd: UNLOCK_MSG called\n"); 303 return nlm4svc_callback(rqstp, NLMPROC_UNLOCK_RES, argp, nlm4svc_proc_unlock); 304} 305 306static __be32 nlm4svc_proc_granted_msg(struct svc_rqst *rqstp, struct nlm_args *argp, 307 void *resp) 308{ 309 dprintk("lockd: GRANTED_MSG called\n"); 310 return nlm4svc_callback(rqstp, NLMPROC_GRANTED_RES, argp, nlm4svc_proc_granted); 311} 312 313/* 314 * SHARE: create a DOS share or alter existing share. 315 */ 316static __be32 317nlm4svc_proc_share(struct svc_rqst *rqstp, struct nlm_args *argp, 318 struct nlm_res *resp) 319{ 320 struct nlm_host *host; 321 struct nlm_file *file; 322 323 dprintk("lockd: SHARE called\n"); 324 325 resp->cookie = argp->cookie; 326 327 /* Don't accept new lock requests during grace period */ 328 if (nlmsvc_grace_period && !argp->reclaim) { 329 resp->status = nlm_lck_denied_grace_period; 330 return rpc_success; 331 } 332 333 /* Obtain client and file */ 334 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 335 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 336 337 /* Now try to create the share */ 338 resp->status = nlmsvc_share_file(host, file, argp); 339 340 dprintk("lockd: SHARE status %d\n", ntohl(resp->status)); 341 nlm_release_host(host); 342 nlm_release_file(file); 343 return rpc_success; 344} 345 346/* 347 * UNSHARE: Release a DOS share. 348 */ 349static __be32 350nlm4svc_proc_unshare(struct svc_rqst *rqstp, struct nlm_args *argp, 351 struct nlm_res *resp) 352{ 353 struct nlm_host *host; 354 struct nlm_file *file; 355 356 dprintk("lockd: UNSHARE called\n"); 357 358 resp->cookie = argp->cookie; 359 360 /* Don't accept requests during grace period */ 361 if (nlmsvc_grace_period) { 362 resp->status = nlm_lck_denied_grace_period; 363 return rpc_success; 364 } 365 366 /* Obtain client and file */ 367 if ((resp->status = nlm4svc_retrieve_args(rqstp, argp, &host, &file))) 368 return resp->status == nlm_drop_reply ? rpc_drop_reply :rpc_success; 369 370 /* Now try to lock the file */ 371 resp->status = nlmsvc_unshare_file(host, file, argp); 372 373 dprintk("lockd: UNSHARE status %d\n", ntohl(resp->status)); 374 nlm_release_host(host); 375 nlm_release_file(file); 376 return rpc_success; 377} 378 379/* 380 * NM_LOCK: Create an unmonitored lock 381 */ 382static __be32 383nlm4svc_proc_nm_lock(struct svc_rqst *rqstp, struct nlm_args *argp, 384 struct nlm_res *resp) 385{ 386 dprintk("lockd: NM_LOCK called\n"); 387 388 argp->monitor = 0; /* just clean the monitor flag */ 389 return nlm4svc_proc_lock(rqstp, argp, resp); 390} 391 392/* 393 * FREE_ALL: Release all locks and shares held by client 394 */ 395static __be32 396nlm4svc_proc_free_all(struct svc_rqst *rqstp, struct nlm_args *argp, 397 void *resp) 398{ 399 struct nlm_host *host; 400 401 /* Obtain client */ 402 if (nlm4svc_retrieve_args(rqstp, argp, &host, NULL)) 403 return rpc_success; 404 405 nlmsvc_free_host_resources(host); 406 nlm_release_host(host); 407 return rpc_success; 408} 409 410/* 411 * SM_NOTIFY: private callback from statd (not part of official NLM proto) 412 */ 413static __be32 414nlm4svc_proc_sm_notify(struct svc_rqst *rqstp, struct nlm_reboot *argp, 415 void *resp) 416{ 417 struct sockaddr_in saddr; 418 419 memcpy(&saddr, svc_addr_in(rqstp), sizeof(saddr)); 420 421 dprintk("lockd: SM_NOTIFY called\n"); 422 if (saddr.sin_addr.s_addr != htonl(INADDR_LOOPBACK) 423 || ntohs(saddr.sin_port) >= 1024) { 424 char buf[RPC_MAX_ADDRBUFLEN]; 425 printk(KERN_WARNING "lockd: rejected NSM callback from %s\n", 426 svc_print_addr(rqstp, buf, sizeof(buf))); 427 return rpc_system_err; 428 } 429 430 /* Obtain the host pointer for this NFS server and try to 431 * reclaim all locks we hold on this server. 432 */ 433 memset(&saddr, 0, sizeof(saddr)); 434 saddr.sin_addr.s_addr = argp->addr; 435 nlm_host_rebooted(&saddr, argp->mon, argp->len, argp->state); 436 437 return rpc_success; 438} 439 440/* 441 * client sent a GRANTED_RES, let's remove the associated block 442 */ 443static __be32 444nlm4svc_proc_granted_res(struct svc_rqst *rqstp, struct nlm_res *argp, 445 void *resp) 446{ 447 if (!nlmsvc_ops) 448 return rpc_success; 449 450 dprintk("lockd: GRANTED_RES called\n"); 451 452 nlmsvc_grant_reply(&argp->cookie, argp->status); 453 return rpc_success; 454} 455 456 457/* 458 * NLM Server procedures. 459 */ 460 461#define nlm4svc_encode_norep nlm4svc_encode_void 462#define nlm4svc_decode_norep nlm4svc_decode_void 463#define nlm4svc_decode_testres nlm4svc_decode_void 464#define nlm4svc_decode_lockres nlm4svc_decode_void 465#define nlm4svc_decode_unlockres nlm4svc_decode_void 466#define nlm4svc_decode_cancelres nlm4svc_decode_void 467#define nlm4svc_decode_grantedres nlm4svc_decode_void 468 469#define nlm4svc_proc_none nlm4svc_proc_null 470#define nlm4svc_proc_test_res nlm4svc_proc_null 471#define nlm4svc_proc_lock_res nlm4svc_proc_null 472#define nlm4svc_proc_cancel_res nlm4svc_proc_null 473#define nlm4svc_proc_unlock_res nlm4svc_proc_null 474 475struct nlm_void { int dummy; }; 476 477#define PROC(name, xargt, xrest, argt, rest, respsize) \ 478 { .pc_func = (svc_procfunc) nlm4svc_proc_##name, \ 479 .pc_decode = (kxdrproc_t) nlm4svc_decode_##xargt, \ 480 .pc_encode = (kxdrproc_t) nlm4svc_encode_##xrest, \ 481 .pc_release = NULL, \ 482 .pc_argsize = sizeof(struct nlm_##argt), \ 483 .pc_ressize = sizeof(struct nlm_##rest), \ 484 .pc_xdrressize = respsize, \ 485 } 486#define Ck (1+XDR_QUADLEN(NLM_MAXCOOKIELEN)) /* cookie */ 487#define No (1+1024/4) /* netobj */ 488#define St 1 /* status */ 489#define Rg 4 /* range (offset + length) */ 490struct svc_procedure nlmsvc_procedures4[] = { 491 PROC(null, void, void, void, void, 1), 492 PROC(test, testargs, testres, args, res, Ck+St+2+No+Rg), 493 PROC(lock, lockargs, res, args, res, Ck+St), 494 PROC(cancel, cancargs, res, args, res, Ck+St), 495 PROC(unlock, unlockargs, res, args, res, Ck+St), 496 PROC(granted, testargs, res, args, res, Ck+St), 497 PROC(test_msg, testargs, norep, args, void, 1), 498 PROC(lock_msg, lockargs, norep, args, void, 1), 499 PROC(cancel_msg, cancargs, norep, args, void, 1), 500 PROC(unlock_msg, unlockargs, norep, args, void, 1), 501 PROC(granted_msg, testargs, norep, args, void, 1), 502 PROC(test_res, testres, norep, res, void, 1), 503 PROC(lock_res, lockres, norep, res, void, 1), 504 PROC(cancel_res, cancelres, norep, res, void, 1), 505 PROC(unlock_res, unlockres, norep, res, void, 1), 506 PROC(granted_res, res, norep, res, void, 1), 507 /* statd callback */ 508 PROC(sm_notify, reboot, void, reboot, void, 1), 509 PROC(none, void, void, void, void, 0), 510 PROC(none, void, void, void, void, 0), 511 PROC(none, void, void, void, void, 0), 512 PROC(share, shareargs, shareres, args, res, Ck+St+1), 513 PROC(unshare, shareargs, shareres, args, res, Ck+St+1), 514 PROC(nm_lock, lockargs, res, args, res, Ck+St), 515 PROC(free_all, notify, void, args, void, 1), 516 517}; 518