1 /* 2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 3 * Written by David Howells (dhowells@redhat.com) 4 */ 5 #include <linux/module.h> 6 #include <linux/nfs_fs.h> 7 #include <linux/nfs_mount.h> 8 #include <linux/sunrpc/addr.h> 9 #include <linux/sunrpc/auth.h> 10 #include <linux/sunrpc/xprt.h> 11 #include <linux/sunrpc/bc_xprt.h> 12 #include <linux/sunrpc/rpc_pipe_fs.h> 13 #include "internal.h" 14 #include "callback.h" 15 #include "delegation.h" 16 #include "nfs4session.h" 17 #include "nfs4idmap.h" 18 #include "pnfs.h" 19 #include "netns.h" 20 21 #define NFSDBG_FACILITY NFSDBG_CLIENT 22 23 /* 24 * Get a unique NFSv4.0 callback identifier which will be used 25 * by the V4.0 callback service to lookup the nfs_client struct 26 */ 27 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 28 { 29 int ret = 0; 30 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 31 32 if (clp->rpc_ops->version != 4 || minorversion != 0) 33 return ret; 34 idr_preload(GFP_KERNEL); 35 spin_lock(&nn->nfs_client_lock); 36 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT); 37 if (ret >= 0) 38 clp->cl_cb_ident = ret; 39 spin_unlock(&nn->nfs_client_lock); 40 idr_preload_end(); 41 return ret < 0 ? ret : 0; 42 } 43 44 #ifdef CONFIG_NFS_V4_1 45 /** 46 * Per auth flavor data server rpc clients 47 */ 48 struct nfs4_ds_server { 49 struct list_head list; /* ds_clp->cl_ds_clients */ 50 struct rpc_clnt *rpc_clnt; 51 }; 52 53 /** 54 * Common lookup case for DS I/O 55 */ 56 static struct nfs4_ds_server * 57 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 58 { 59 struct nfs4_ds_server *dss; 60 61 rcu_read_lock(); 62 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) { 63 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 64 continue; 65 goto out; 66 } 67 dss = NULL; 68 out: 69 rcu_read_unlock(); 70 return dss; 71 } 72 73 static struct nfs4_ds_server * 74 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor, 75 struct nfs4_ds_server *new) 76 { 77 struct nfs4_ds_server *dss; 78 79 spin_lock(&ds_clp->cl_lock); 80 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) { 81 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 82 continue; 83 goto out; 84 } 85 if (new) 86 list_add_rcu(&new->list, &ds_clp->cl_ds_clients); 87 dss = new; 88 out: 89 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ 90 return dss; 91 } 92 93 static struct nfs4_ds_server * 94 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 95 { 96 struct nfs4_ds_server *dss; 97 98 dss = kmalloc(sizeof(*dss), GFP_NOFS); 99 if (dss == NULL) 100 return ERR_PTR(-ENOMEM); 101 102 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor); 103 if (IS_ERR(dss->rpc_clnt)) { 104 int err = PTR_ERR(dss->rpc_clnt); 105 kfree (dss); 106 return ERR_PTR(err); 107 } 108 INIT_LIST_HEAD(&dss->list); 109 110 return dss; 111 } 112 113 static void 114 nfs4_free_ds_server(struct nfs4_ds_server *dss) 115 { 116 rpc_release_client(dss->rpc_clnt); 117 kfree(dss); 118 } 119 120 /** 121 * Find or create a DS rpc client with th MDS server rpc client auth flavor 122 * in the nfs_client cl_ds_clients list. 123 */ 124 struct rpc_clnt * 125 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode) 126 { 127 struct nfs4_ds_server *dss, *new; 128 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor; 129 130 dss = nfs4_find_ds_client(ds_clp, flavor); 131 if (dss != NULL) 132 goto out; 133 new = nfs4_alloc_ds_server(ds_clp, flavor); 134 if (IS_ERR(new)) 135 return ERR_CAST(new); 136 dss = nfs4_add_ds_client(ds_clp, flavor, new); 137 if (dss != new) 138 nfs4_free_ds_server(new); 139 out: 140 return dss->rpc_clnt; 141 } 142 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); 143 144 static void 145 nfs4_shutdown_ds_clients(struct nfs_client *clp) 146 { 147 struct nfs4_ds_server *dss; 148 LIST_HEAD(shutdown_list); 149 150 while (!list_empty(&clp->cl_ds_clients)) { 151 dss = list_entry(clp->cl_ds_clients.next, 152 struct nfs4_ds_server, list); 153 list_del(&dss->list); 154 rpc_shutdown_client(dss->rpc_clnt); 155 kfree (dss); 156 } 157 } 158 159 void nfs41_shutdown_client(struct nfs_client *clp) 160 { 161 if (nfs4_has_session(clp)) { 162 nfs4_shutdown_ds_clients(clp); 163 nfs4_destroy_session(clp->cl_session); 164 nfs4_destroy_clientid(clp); 165 } 166 167 } 168 #endif /* CONFIG_NFS_V4_1 */ 169 170 void nfs40_shutdown_client(struct nfs_client *clp) 171 { 172 if (clp->cl_slot_tbl) { 173 nfs4_shutdown_slot_table(clp->cl_slot_tbl); 174 kfree(clp->cl_slot_tbl); 175 } 176 } 177 178 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) 179 { 180 int err; 181 struct nfs_client *clp = nfs_alloc_client(cl_init); 182 if (IS_ERR(clp)) 183 return clp; 184 185 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 186 if (err) 187 goto error; 188 189 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) { 190 err = -EINVAL; 191 goto error; 192 } 193 194 spin_lock_init(&clp->cl_lock); 195 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 196 INIT_LIST_HEAD(&clp->cl_ds_clients); 197 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 198 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 199 clp->cl_minorversion = cl_init->minorversion; 200 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 201 clp->cl_mig_gen = 1; 202 #if IS_ENABLED(CONFIG_NFS_V4_1) 203 init_waitqueue_head(&clp->cl_lock_waitq); 204 #endif 205 return clp; 206 207 error: 208 nfs_free_client(clp); 209 return ERR_PTR(err); 210 } 211 212 /* 213 * Destroy the NFS4 callback service 214 */ 215 static void nfs4_destroy_callback(struct nfs_client *clp) 216 { 217 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 218 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 219 } 220 221 static void nfs4_shutdown_client(struct nfs_client *clp) 222 { 223 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 224 nfs4_kill_renewd(clp); 225 clp->cl_mvops->shutdown_client(clp); 226 nfs4_destroy_callback(clp); 227 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 228 nfs_idmap_delete(clp); 229 230 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 231 kfree(clp->cl_serverowner); 232 kfree(clp->cl_serverscope); 233 kfree(clp->cl_implid); 234 kfree(clp->cl_owner_id); 235 } 236 237 void nfs4_free_client(struct nfs_client *clp) 238 { 239 nfs4_shutdown_client(clp); 240 nfs_free_client(clp); 241 } 242 243 /* 244 * Initialize the NFS4 callback service 245 */ 246 static int nfs4_init_callback(struct nfs_client *clp) 247 { 248 struct rpc_xprt *xprt; 249 int error; 250 251 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 252 253 if (nfs4_has_session(clp)) { 254 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 255 if (error < 0) 256 return error; 257 } 258 259 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 260 if (error < 0) { 261 dprintk("%s: failed to start callback. Error = %d\n", 262 __func__, error); 263 return error; 264 } 265 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 266 267 return 0; 268 } 269 270 /** 271 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 272 * @clp - nfs_client to initialize 273 * 274 * Returns zero on success, or a negative errno if some error occurred. 275 */ 276 int nfs40_init_client(struct nfs_client *clp) 277 { 278 struct nfs4_slot_table *tbl; 279 int ret; 280 281 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 282 if (tbl == NULL) 283 return -ENOMEM; 284 285 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 286 "NFSv4.0 transport Slot table"); 287 if (ret) { 288 kfree(tbl); 289 return ret; 290 } 291 292 clp->cl_slot_tbl = tbl; 293 return 0; 294 } 295 296 #if defined(CONFIG_NFS_V4_1) 297 298 /** 299 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 300 * @clp - nfs_client to initialize 301 * 302 * Returns zero on success, or a negative errno if some error occurred. 303 */ 304 int nfs41_init_client(struct nfs_client *clp) 305 { 306 struct nfs4_session *session = NULL; 307 308 /* 309 * Create the session and mark it expired. 310 * When a SEQUENCE operation encounters the expired session 311 * it will do session recovery to initialize it. 312 */ 313 session = nfs4_alloc_session(clp); 314 if (!session) 315 return -ENOMEM; 316 317 clp->cl_session = session; 318 319 /* 320 * The create session reply races with the server back 321 * channel probe. Mark the client NFS_CS_SESSION_INITING 322 * so that the client back channel can find the 323 * nfs_client struct 324 */ 325 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 326 return 0; 327 } 328 329 #endif /* CONFIG_NFS_V4_1 */ 330 331 /* 332 * Initialize the minor version specific parts of an NFS4 client record 333 */ 334 static int nfs4_init_client_minor_version(struct nfs_client *clp) 335 { 336 int ret; 337 338 ret = clp->cl_mvops->init_client(clp); 339 if (ret) 340 return ret; 341 return nfs4_init_callback(clp); 342 } 343 344 /** 345 * nfs4_init_client - Initialise an NFS4 client record 346 * 347 * @clp: nfs_client to initialise 348 * @timeparms: timeout parameters for underlying RPC transport 349 * @ip_addr: callback IP address in presentation format 350 * @authflavor: authentication flavor for underlying RPC transport 351 * 352 * Returns pointer to an NFS client, or an ERR_PTR value. 353 */ 354 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 355 const struct nfs_client_initdata *cl_init) 356 { 357 char buf[INET6_ADDRSTRLEN + 1]; 358 const char *ip_addr = cl_init->ip_addr; 359 struct nfs_client *old; 360 int error; 361 362 if (clp->cl_cons_state == NFS_CS_READY) 363 /* the client is initialised already */ 364 return clp; 365 366 /* Check NFS protocol revision and initialize RPC op vector */ 367 clp->rpc_ops = &nfs_v4_clientops; 368 369 if (clp->cl_minorversion != 0) 370 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 371 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 372 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 373 374 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 375 if (error == -EINVAL) 376 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 377 if (error < 0) 378 goto error; 379 380 /* If no clientaddr= option was specified, find a usable cb address */ 381 if (ip_addr == NULL) { 382 struct sockaddr_storage cb_addr; 383 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 384 385 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 386 if (error < 0) 387 goto error; 388 error = rpc_ntop(sap, buf, sizeof(buf)); 389 if (error < 0) 390 goto error; 391 ip_addr = (const char *)buf; 392 } 393 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 394 395 error = nfs_idmap_new(clp); 396 if (error < 0) { 397 dprintk("%s: failed to create idmapper. Error = %d\n", 398 __func__, error); 399 goto error; 400 } 401 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 402 403 error = nfs4_init_client_minor_version(clp); 404 if (error < 0) 405 goto error; 406 407 if (!nfs4_has_session(clp)) 408 nfs_mark_client_ready(clp, NFS_CS_READY); 409 410 error = nfs4_discover_server_trunking(clp, &old); 411 if (error < 0) 412 goto error; 413 414 if (clp != old) 415 clp->cl_preserve_clid = true; 416 nfs_put_client(clp); 417 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 418 return old; 419 420 error: 421 nfs_mark_client_ready(clp, error); 422 nfs_put_client(clp); 423 return ERR_PTR(error); 424 } 425 426 /* 427 * SETCLIENTID just did a callback update with the callback ident in 428 * "drop," but server trunking discovery claims "drop" and "keep" are 429 * actually the same server. Swap the callback IDs so that "keep" 430 * will continue to use the callback ident the server now knows about, 431 * and so that "keep"'s original callback ident is destroyed when 432 * "drop" is freed. 433 */ 434 static void nfs4_swap_callback_idents(struct nfs_client *keep, 435 struct nfs_client *drop) 436 { 437 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 438 unsigned int save = keep->cl_cb_ident; 439 440 if (keep->cl_cb_ident == drop->cl_cb_ident) 441 return; 442 443 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 444 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 445 446 spin_lock(&nn->nfs_client_lock); 447 448 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 449 keep->cl_cb_ident = drop->cl_cb_ident; 450 451 idr_replace(&nn->cb_ident_idr, drop, save); 452 drop->cl_cb_ident = save; 453 454 spin_unlock(&nn->nfs_client_lock); 455 } 456 457 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 458 const struct nfs_client *clp2) 459 { 460 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 461 return true; 462 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 463 } 464 465 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 466 { 467 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 468 } 469 470 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 471 struct nfs_client **prev, struct nfs_net *nn) 472 { 473 int status; 474 475 if (pos->rpc_ops != new->rpc_ops) 476 return 1; 477 478 if (pos->cl_minorversion != new->cl_minorversion) 479 return 1; 480 481 /* If "pos" isn't marked ready, we can't trust the 482 * remaining fields in "pos", especially the client 483 * ID and serverowner fields. Wait for CREATE_SESSION 484 * to finish. */ 485 if (pos->cl_cons_state > NFS_CS_READY) { 486 atomic_inc(&pos->cl_count); 487 spin_unlock(&nn->nfs_client_lock); 488 489 nfs_put_client(*prev); 490 *prev = pos; 491 492 status = nfs_wait_client_init_complete(pos); 493 spin_lock(&nn->nfs_client_lock); 494 495 if (status < 0) 496 return status; 497 } 498 499 if (pos->cl_cons_state != NFS_CS_READY) 500 return 1; 501 502 if (pos->cl_clientid != new->cl_clientid) 503 return 1; 504 505 /* NFSv4.1 always uses the uniform string, however someone 506 * might switch the uniquifier string on us. 507 */ 508 if (!nfs4_match_client_owner_id(pos, new)) 509 return 1; 510 511 return 0; 512 } 513 514 /** 515 * nfs40_walk_client_list - Find server that recognizes a client ID 516 * 517 * @new: nfs_client with client ID to test 518 * @result: OUT: found nfs_client, or new 519 * @cred: credential to use for trunking test 520 * 521 * Returns zero, a negative errno, or a negative NFS4ERR status. 522 * If zero is returned, an nfs_client pointer is planted in "result." 523 * 524 * NB: nfs40_walk_client_list() relies on the new nfs_client being 525 * the last nfs_client on the list. 526 */ 527 int nfs40_walk_client_list(struct nfs_client *new, 528 struct nfs_client **result, 529 struct rpc_cred *cred) 530 { 531 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 532 struct nfs_client *pos, *prev = NULL; 533 struct nfs4_setclientid_res clid = { 534 .clientid = new->cl_clientid, 535 .confirm = new->cl_confirm, 536 }; 537 int status = -NFS4ERR_STALE_CLIENTID; 538 539 spin_lock(&nn->nfs_client_lock); 540 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 541 542 status = nfs4_match_client(pos, new, &prev, nn); 543 if (status < 0) 544 goto out_unlock; 545 if (status != 0) 546 continue; 547 /* 548 * We just sent a new SETCLIENTID, which should have 549 * caused the server to return a new cl_confirm. So if 550 * cl_confirm is the same, then this is a different 551 * server that just returned the same cl_confirm by 552 * coincidence: 553 */ 554 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 555 &new->cl_confirm)) 556 continue; 557 /* 558 * But if the cl_confirm's are different, then the only 559 * way that a SETCLIENTID_CONFIRM to pos can succeed is 560 * if new and pos point to the same server: 561 */ 562 atomic_inc(&pos->cl_count); 563 spin_unlock(&nn->nfs_client_lock); 564 565 nfs_put_client(prev); 566 prev = pos; 567 568 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 569 switch (status) { 570 case -NFS4ERR_STALE_CLIENTID: 571 break; 572 case 0: 573 nfs4_swap_callback_idents(pos, new); 574 pos->cl_confirm = new->cl_confirm; 575 576 prev = NULL; 577 *result = pos; 578 goto out; 579 case -ERESTARTSYS: 580 case -ETIMEDOUT: 581 /* The callback path may have been inadvertently 582 * changed. Schedule recovery! 583 */ 584 nfs4_schedule_path_down_recovery(pos); 585 default: 586 goto out; 587 } 588 589 spin_lock(&nn->nfs_client_lock); 590 } 591 out_unlock: 592 spin_unlock(&nn->nfs_client_lock); 593 594 /* No match found. The server lost our clientid */ 595 out: 596 nfs_put_client(prev); 597 return status; 598 } 599 600 #ifdef CONFIG_NFS_V4_1 601 /* 602 * Returns true if the server major ids match 603 */ 604 static bool 605 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 606 struct nfs41_server_owner *o2) 607 { 608 if (o1->major_id_sz != o2->major_id_sz) 609 return false; 610 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 611 } 612 613 /* 614 * Returns true if the server scopes match 615 */ 616 static bool 617 nfs4_check_server_scope(struct nfs41_server_scope *s1, 618 struct nfs41_server_scope *s2) 619 { 620 if (s1->server_scope_sz != s2->server_scope_sz) 621 return false; 622 return memcmp(s1->server_scope, s2->server_scope, 623 s1->server_scope_sz) == 0; 624 } 625 626 /** 627 * nfs4_detect_session_trunking - Checks for session trunking. 628 * 629 * Called after a successful EXCHANGE_ID on a multi-addr connection. 630 * Upon success, add the transport. 631 * 632 * @clp: original mount nfs_client 633 * @res: result structure from an exchange_id using the original mount 634 * nfs_client with a new multi_addr transport 635 * 636 * Returns zero on success, otherwise -EINVAL 637 * 638 * Note: since the exchange_id for the new multi_addr transport uses the 639 * same nfs_client from the original mount, the cl_owner_id is reused, 640 * so eir_clientowner is the same. 641 */ 642 int nfs4_detect_session_trunking(struct nfs_client *clp, 643 struct nfs41_exchange_id_res *res, 644 struct rpc_xprt *xprt) 645 { 646 /* Check eir_clientid */ 647 if (clp->cl_clientid != res->clientid) 648 goto out_err; 649 650 /* Check eir_server_owner so_major_id */ 651 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 652 res->server_owner)) 653 goto out_err; 654 655 /* Check eir_server_owner so_minor_id */ 656 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 657 goto out_err; 658 659 /* Check eir_server_scope */ 660 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 661 goto out_err; 662 663 /* Session trunking passed, add the xprt */ 664 rpc_clnt_xprt_switch_add_xprt(clp->cl_rpcclient, xprt); 665 666 pr_info("NFS: %s: Session trunking succeeded for %s\n", 667 clp->cl_hostname, 668 xprt->address_strings[RPC_DISPLAY_ADDR]); 669 670 return 0; 671 out_err: 672 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 673 xprt->address_strings[RPC_DISPLAY_ADDR]); 674 675 return -EINVAL; 676 } 677 678 /** 679 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 680 * 681 * @new: nfs_client with client ID to test 682 * @result: OUT: found nfs_client, or new 683 * @cred: credential to use for trunking test 684 * 685 * Returns zero, a negative errno, or a negative NFS4ERR status. 686 * If zero is returned, an nfs_client pointer is planted in "result." 687 * 688 * NB: nfs41_walk_client_list() relies on the new nfs_client being 689 * the last nfs_client on the list. 690 */ 691 int nfs41_walk_client_list(struct nfs_client *new, 692 struct nfs_client **result, 693 struct rpc_cred *cred) 694 { 695 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 696 struct nfs_client *pos, *prev = NULL; 697 int status = -NFS4ERR_STALE_CLIENTID; 698 699 spin_lock(&nn->nfs_client_lock); 700 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 701 702 if (pos == new) 703 goto found; 704 705 status = nfs4_match_client(pos, new, &prev, nn); 706 if (status < 0) 707 goto out; 708 if (status != 0) 709 continue; 710 711 /* 712 * Note that session trunking is just a special subcase of 713 * client id trunking. In either case, we want to fall back 714 * to using the existing nfs_client. 715 */ 716 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 717 new->cl_serverowner)) 718 continue; 719 720 found: 721 atomic_inc(&pos->cl_count); 722 *result = pos; 723 status = 0; 724 break; 725 } 726 727 out: 728 spin_unlock(&nn->nfs_client_lock); 729 nfs_put_client(prev); 730 return status; 731 } 732 #endif /* CONFIG_NFS_V4_1 */ 733 734 static void nfs4_destroy_server(struct nfs_server *server) 735 { 736 nfs_server_return_all_delegations(server); 737 unset_pnfs_layoutdriver(server); 738 nfs4_purge_state_owners(server); 739 } 740 741 /* 742 * NFSv4.0 callback thread helper 743 * 744 * Find a client by callback identifier 745 */ 746 struct nfs_client * 747 nfs4_find_client_ident(struct net *net, int cb_ident) 748 { 749 struct nfs_client *clp; 750 struct nfs_net *nn = net_generic(net, nfs_net_id); 751 752 spin_lock(&nn->nfs_client_lock); 753 clp = idr_find(&nn->cb_ident_idr, cb_ident); 754 if (clp) 755 atomic_inc(&clp->cl_count); 756 spin_unlock(&nn->nfs_client_lock); 757 return clp; 758 } 759 760 #if defined(CONFIG_NFS_V4_1) 761 /* Common match routine for v4.0 and v4.1 callback services */ 762 static bool nfs4_cb_match_client(const struct sockaddr *addr, 763 struct nfs_client *clp, u32 minorversion) 764 { 765 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 766 767 /* Don't match clients that failed to initialise */ 768 if (!(clp->cl_cons_state == NFS_CS_READY || 769 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 770 return false; 771 772 smp_rmb(); 773 774 /* Match the version and minorversion */ 775 if (clp->rpc_ops->version != 4 || 776 clp->cl_minorversion != minorversion) 777 return false; 778 779 /* Match only the IP address, not the port number */ 780 return rpc_cmp_addr(addr, clap); 781 } 782 783 /* 784 * NFSv4.1 callback thread helper 785 * For CB_COMPOUND calls, find a client by IP address, protocol version, 786 * minorversion, and sessionID 787 * 788 * Returns NULL if no such client 789 */ 790 struct nfs_client * 791 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 792 struct nfs4_sessionid *sid, u32 minorversion) 793 { 794 struct nfs_client *clp; 795 struct nfs_net *nn = net_generic(net, nfs_net_id); 796 797 spin_lock(&nn->nfs_client_lock); 798 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 799 if (nfs4_cb_match_client(addr, clp, minorversion) == false) 800 continue; 801 802 if (!nfs4_has_session(clp)) 803 continue; 804 805 /* Match sessionid*/ 806 if (memcmp(clp->cl_session->sess_id.data, 807 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 808 continue; 809 810 atomic_inc(&clp->cl_count); 811 spin_unlock(&nn->nfs_client_lock); 812 return clp; 813 } 814 spin_unlock(&nn->nfs_client_lock); 815 return NULL; 816 } 817 818 #else /* CONFIG_NFS_V4_1 */ 819 820 struct nfs_client * 821 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 822 struct nfs4_sessionid *sid, u32 minorversion) 823 { 824 return NULL; 825 } 826 #endif /* CONFIG_NFS_V4_1 */ 827 828 /* 829 * Set up an NFS4 client 830 */ 831 static int nfs4_set_client(struct nfs_server *server, 832 const char *hostname, 833 const struct sockaddr *addr, 834 const size_t addrlen, 835 const char *ip_addr, 836 int proto, const struct rpc_timeout *timeparms, 837 u32 minorversion, struct net *net) 838 { 839 struct nfs_client_initdata cl_init = { 840 .hostname = hostname, 841 .addr = addr, 842 .addrlen = addrlen, 843 .ip_addr = ip_addr, 844 .nfs_mod = &nfs_v4, 845 .proto = proto, 846 .minorversion = minorversion, 847 .net = net, 848 .timeparms = timeparms, 849 }; 850 struct nfs_client *clp; 851 852 if (server->flags & NFS_MOUNT_NORESVPORT) 853 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 854 if (server->options & NFS_OPTION_MIGRATION) 855 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 856 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 857 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags); 858 859 /* Allocate or find a client reference we can use */ 860 clp = nfs_get_client(&cl_init); 861 if (IS_ERR(clp)) 862 return PTR_ERR(clp); 863 864 if (server->nfs_client == clp) 865 return -ELOOP; 866 867 /* 868 * Query for the lease time on clientid setup or renewal 869 * 870 * Note that this will be set on nfs_clients that were created 871 * only for the DS role and did not set this bit, but now will 872 * serve a dual role. 873 */ 874 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 875 876 server->nfs_client = clp; 877 return 0; 878 } 879 880 /* 881 * Set up a pNFS Data Server client. 882 * 883 * Return any existing nfs_client that matches server address,port,version 884 * and minorversion. 885 * 886 * For a new nfs_client, use a soft mount (default), a low retrans and a 887 * low timeout interval so that if a connection is lost, we retry through 888 * the MDS. 889 */ 890 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 891 const struct sockaddr *ds_addr, int ds_addrlen, 892 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 893 u32 minor_version) 894 { 895 struct rpc_timeout ds_timeout; 896 struct nfs_client *mds_clp = mds_srv->nfs_client; 897 struct nfs_client_initdata cl_init = { 898 .addr = ds_addr, 899 .addrlen = ds_addrlen, 900 .nodename = mds_clp->cl_rpcclient->cl_nodename, 901 .ip_addr = mds_clp->cl_ipaddr, 902 .nfs_mod = &nfs_v4, 903 .proto = ds_proto, 904 .minorversion = minor_version, 905 .net = mds_clp->cl_net, 906 .timeparms = &ds_timeout, 907 }; 908 char buf[INET6_ADDRSTRLEN + 1]; 909 910 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0) 911 return ERR_PTR(-EINVAL); 912 cl_init.hostname = buf; 913 914 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 915 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 916 917 /* 918 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 919 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 920 * (section 13.1 RFC 5661). 921 */ 922 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 923 return nfs_get_client(&cl_init); 924 } 925 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 926 927 /* 928 * Session has been established, and the client marked ready. 929 * Set the mount rsize and wsize with negotiated fore channel 930 * attributes which will be bound checked in nfs_server_set_fsinfo. 931 */ 932 static void nfs4_session_set_rwsize(struct nfs_server *server) 933 { 934 #ifdef CONFIG_NFS_V4_1 935 struct nfs4_session *sess; 936 u32 server_resp_sz; 937 u32 server_rqst_sz; 938 939 if (!nfs4_has_session(server->nfs_client)) 940 return; 941 sess = server->nfs_client->cl_session; 942 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 943 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 944 945 if (!server->rsize || server->rsize > server_resp_sz) 946 server->rsize = server_resp_sz; 947 if (!server->wsize || server->wsize > server_rqst_sz) 948 server->wsize = server_rqst_sz; 949 #endif /* CONFIG_NFS_V4_1 */ 950 } 951 952 static int nfs4_server_common_setup(struct nfs_server *server, 953 struct nfs_fh *mntfh, bool auth_probe) 954 { 955 struct nfs_fattr *fattr; 956 int error; 957 958 /* data servers support only a subset of NFSv4.1 */ 959 if (is_ds_only_client(server->nfs_client)) 960 return -EPROTONOSUPPORT; 961 962 fattr = nfs_alloc_fattr(); 963 if (fattr == NULL) 964 return -ENOMEM; 965 966 /* We must ensure the session is initialised first */ 967 error = nfs4_init_session(server->nfs_client); 968 if (error < 0) 969 goto out; 970 971 /* Set the basic capabilities */ 972 server->caps |= server->nfs_client->cl_mvops->init_caps; 973 if (server->flags & NFS_MOUNT_NORDIRPLUS) 974 server->caps &= ~NFS_CAP_READDIRPLUS; 975 /* 976 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 977 * authentication. 978 */ 979 if (nfs4_disable_idmapping && 980 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 981 server->caps |= NFS_CAP_UIDGID_NOMAP; 982 983 984 /* Probe the root fh to retrieve its FSID and filehandle */ 985 error = nfs4_get_rootfh(server, mntfh, auth_probe); 986 if (error < 0) 987 goto out; 988 989 dprintk("Server FSID: %llx:%llx\n", 990 (unsigned long long) server->fsid.major, 991 (unsigned long long) server->fsid.minor); 992 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 993 994 nfs4_session_set_rwsize(server); 995 996 error = nfs_probe_fsinfo(server, mntfh, fattr); 997 if (error < 0) 998 goto out; 999 1000 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1001 server->namelen = NFS4_MAXNAMLEN; 1002 1003 nfs_server_insert_lists(server); 1004 server->mount_time = jiffies; 1005 server->destroy = nfs4_destroy_server; 1006 out: 1007 nfs_free_fattr(fattr); 1008 return error; 1009 } 1010 1011 /* 1012 * Create a version 4 volume record 1013 */ 1014 static int nfs4_init_server(struct nfs_server *server, 1015 struct nfs_parsed_mount_data *data) 1016 { 1017 struct rpc_timeout timeparms; 1018 int error; 1019 1020 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1021 data->timeo, data->retrans); 1022 1023 /* Initialise the client representation from the mount data */ 1024 server->flags = data->flags; 1025 server->options = data->options; 1026 server->auth_info = data->auth_info; 1027 1028 /* Use the first specified auth flavor. If this flavor isn't 1029 * allowed by the server, use the SECINFO path to try the 1030 * other specified flavors */ 1031 if (data->auth_info.flavor_len >= 1) 1032 data->selected_flavor = data->auth_info.flavors[0]; 1033 else 1034 data->selected_flavor = RPC_AUTH_UNIX; 1035 1036 /* Get a client record */ 1037 error = nfs4_set_client(server, 1038 data->nfs_server.hostname, 1039 (const struct sockaddr *)&data->nfs_server.address, 1040 data->nfs_server.addrlen, 1041 data->client_address, 1042 data->nfs_server.protocol, 1043 &timeparms, 1044 data->minorversion, 1045 data->net); 1046 if (error < 0) 1047 return error; 1048 1049 if (data->rsize) 1050 server->rsize = nfs_block_size(data->rsize, NULL); 1051 if (data->wsize) 1052 server->wsize = nfs_block_size(data->wsize, NULL); 1053 1054 server->acregmin = data->acregmin * HZ; 1055 server->acregmax = data->acregmax * HZ; 1056 server->acdirmin = data->acdirmin * HZ; 1057 server->acdirmax = data->acdirmax * HZ; 1058 server->port = data->nfs_server.port; 1059 1060 return nfs_init_server_rpcclient(server, &timeparms, 1061 data->selected_flavor); 1062 } 1063 1064 /* 1065 * Create a version 4 volume record 1066 * - keyed on server and FSID 1067 */ 1068 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1069 struct nfs_fh *mntfh)*/ 1070 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 1071 struct nfs_subversion *nfs_mod) 1072 { 1073 struct nfs_server *server; 1074 bool auth_probe; 1075 int error; 1076 1077 server = nfs_alloc_server(); 1078 if (!server) 1079 return ERR_PTR(-ENOMEM); 1080 1081 auth_probe = mount_info->parsed->auth_info.flavor_len < 1; 1082 1083 /* set up the general RPC client */ 1084 error = nfs4_init_server(server, mount_info->parsed); 1085 if (error < 0) 1086 goto error; 1087 1088 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe); 1089 if (error < 0) 1090 goto error; 1091 1092 return server; 1093 1094 error: 1095 nfs_free_server(server); 1096 return ERR_PTR(error); 1097 } 1098 1099 /* 1100 * Create an NFS4 referral server record 1101 */ 1102 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1103 struct nfs_fh *mntfh) 1104 { 1105 struct nfs_client *parent_client; 1106 struct nfs_server *server, *parent_server; 1107 bool auth_probe; 1108 int error; 1109 1110 server = nfs_alloc_server(); 1111 if (!server) 1112 return ERR_PTR(-ENOMEM); 1113 1114 parent_server = NFS_SB(data->sb); 1115 parent_client = parent_server->nfs_client; 1116 1117 /* Initialise the client representation from the parent server */ 1118 nfs_server_copy_userdata(server, parent_server); 1119 1120 /* Get a client representation. 1121 * Note: NFSv4 always uses TCP, */ 1122 error = nfs4_set_client(server, data->hostname, 1123 data->addr, 1124 data->addrlen, 1125 parent_client->cl_ipaddr, 1126 rpc_protocol(parent_server->client), 1127 parent_server->client->cl_timeout, 1128 parent_client->cl_mvops->minor_version, 1129 parent_client->cl_net); 1130 if (error < 0) 1131 goto error; 1132 1133 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1134 if (error < 0) 1135 goto error; 1136 1137 auth_probe = parent_server->auth_info.flavor_len < 1; 1138 1139 error = nfs4_server_common_setup(server, mntfh, auth_probe); 1140 if (error < 0) 1141 goto error; 1142 1143 return server; 1144 1145 error: 1146 nfs_free_server(server); 1147 return ERR_PTR(error); 1148 } 1149 1150 /* 1151 * Grab the destination's particulars, including lease expiry time. 1152 * 1153 * Returns zero if probe succeeded and retrieved FSID matches the FSID 1154 * we have cached. 1155 */ 1156 static int nfs_probe_destination(struct nfs_server *server) 1157 { 1158 struct inode *inode = d_inode(server->super->s_root); 1159 struct nfs_fattr *fattr; 1160 int error; 1161 1162 fattr = nfs_alloc_fattr(); 1163 if (fattr == NULL) 1164 return -ENOMEM; 1165 1166 /* Sanity: the probe won't work if the destination server 1167 * does not recognize the migrated FH. */ 1168 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr); 1169 1170 nfs_free_fattr(fattr); 1171 return error; 1172 } 1173 1174 /** 1175 * nfs4_update_server - Move an nfs_server to a different nfs_client 1176 * 1177 * @server: represents FSID to be moved 1178 * @hostname: new end-point's hostname 1179 * @sap: new end-point's socket address 1180 * @salen: size of "sap" 1181 * @net: net namespace 1182 * 1183 * The nfs_server must be quiescent before this function is invoked. 1184 * Either its session is drained (NFSv4.1+), or its transport is 1185 * plugged and drained (NFSv4.0). 1186 * 1187 * Returns zero on success, or a negative errno value. 1188 */ 1189 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1190 struct sockaddr *sap, size_t salen, struct net *net) 1191 { 1192 struct nfs_client *clp = server->nfs_client; 1193 struct rpc_clnt *clnt = server->client; 1194 struct xprt_create xargs = { 1195 .ident = clp->cl_proto, 1196 .net = net, 1197 .dstaddr = sap, 1198 .addrlen = salen, 1199 .servername = hostname, 1200 }; 1201 char buf[INET6_ADDRSTRLEN + 1]; 1202 struct sockaddr_storage address; 1203 struct sockaddr *localaddr = (struct sockaddr *)&address; 1204 int error; 1205 1206 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1207 if (error != 0) 1208 return error; 1209 1210 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1211 if (error != 0) 1212 return error; 1213 1214 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1215 return -EAFNOSUPPORT; 1216 1217 nfs_server_remove_lists(server); 1218 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1219 error = nfs4_set_client(server, hostname, sap, salen, buf, 1220 clp->cl_proto, clnt->cl_timeout, 1221 clp->cl_minorversion, net); 1222 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1223 nfs_put_client(clp); 1224 if (error != 0) { 1225 nfs_server_insert_lists(server); 1226 return error; 1227 } 1228 1229 if (server->nfs_client->cl_hostname == NULL) 1230 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1231 nfs_server_insert_lists(server); 1232 1233 return nfs_probe_destination(server); 1234 } 1235