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 error = nfs4_discover_server_trunking(clp, &old); 408 if (error < 0) 409 goto error; 410 411 if (clp != old) { 412 clp->cl_preserve_clid = true; 413 /* 414 * Mark the client as having failed initialization so other 415 * processes walking the nfs_client_list in nfs_match_client() 416 * won't try to use it. 417 */ 418 nfs_mark_client_ready(clp, -EPERM); 419 } 420 nfs_put_client(clp); 421 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 422 return old; 423 424 error: 425 nfs_mark_client_ready(clp, error); 426 nfs_put_client(clp); 427 return ERR_PTR(error); 428 } 429 430 /* 431 * SETCLIENTID just did a callback update with the callback ident in 432 * "drop," but server trunking discovery claims "drop" and "keep" are 433 * actually the same server. Swap the callback IDs so that "keep" 434 * will continue to use the callback ident the server now knows about, 435 * and so that "keep"'s original callback ident is destroyed when 436 * "drop" is freed. 437 */ 438 static void nfs4_swap_callback_idents(struct nfs_client *keep, 439 struct nfs_client *drop) 440 { 441 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 442 unsigned int save = keep->cl_cb_ident; 443 444 if (keep->cl_cb_ident == drop->cl_cb_ident) 445 return; 446 447 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 448 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 449 450 spin_lock(&nn->nfs_client_lock); 451 452 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 453 keep->cl_cb_ident = drop->cl_cb_ident; 454 455 idr_replace(&nn->cb_ident_idr, drop, save); 456 drop->cl_cb_ident = save; 457 458 spin_unlock(&nn->nfs_client_lock); 459 } 460 461 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 462 const struct nfs_client *clp2) 463 { 464 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 465 return true; 466 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 467 } 468 469 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 470 { 471 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 472 } 473 474 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 475 struct nfs_client **prev, struct nfs_net *nn) 476 { 477 int status; 478 479 if (pos->rpc_ops != new->rpc_ops) 480 return 1; 481 482 if (pos->cl_minorversion != new->cl_minorversion) 483 return 1; 484 485 /* If "pos" isn't marked ready, we can't trust the 486 * remaining fields in "pos", especially the client 487 * ID and serverowner fields. Wait for CREATE_SESSION 488 * to finish. */ 489 if (pos->cl_cons_state > NFS_CS_READY) { 490 refcount_inc(&pos->cl_count); 491 spin_unlock(&nn->nfs_client_lock); 492 493 nfs_put_client(*prev); 494 *prev = pos; 495 496 status = nfs_wait_client_init_complete(pos); 497 spin_lock(&nn->nfs_client_lock); 498 499 if (status < 0) 500 return status; 501 } 502 503 if (pos->cl_cons_state != NFS_CS_READY) 504 return 1; 505 506 if (pos->cl_clientid != new->cl_clientid) 507 return 1; 508 509 /* NFSv4.1 always uses the uniform string, however someone 510 * might switch the uniquifier string on us. 511 */ 512 if (!nfs4_match_client_owner_id(pos, new)) 513 return 1; 514 515 return 0; 516 } 517 518 /** 519 * nfs40_walk_client_list - Find server that recognizes a client ID 520 * 521 * @new: nfs_client with client ID to test 522 * @result: OUT: found nfs_client, or new 523 * @cred: credential to use for trunking test 524 * 525 * Returns zero, a negative errno, or a negative NFS4ERR status. 526 * If zero is returned, an nfs_client pointer is planted in "result." 527 * 528 * NB: nfs40_walk_client_list() relies on the new nfs_client being 529 * the last nfs_client on the list. 530 */ 531 int nfs40_walk_client_list(struct nfs_client *new, 532 struct nfs_client **result, 533 struct rpc_cred *cred) 534 { 535 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 536 struct nfs_client *pos, *prev = NULL; 537 struct nfs4_setclientid_res clid = { 538 .clientid = new->cl_clientid, 539 .confirm = new->cl_confirm, 540 }; 541 int status = -NFS4ERR_STALE_CLIENTID; 542 543 spin_lock(&nn->nfs_client_lock); 544 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 545 546 if (pos == new) 547 goto found; 548 549 status = nfs4_match_client(pos, new, &prev, nn); 550 if (status < 0) 551 goto out_unlock; 552 if (status != 0) 553 continue; 554 /* 555 * We just sent a new SETCLIENTID, which should have 556 * caused the server to return a new cl_confirm. So if 557 * cl_confirm is the same, then this is a different 558 * server that just returned the same cl_confirm by 559 * coincidence: 560 */ 561 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 562 &new->cl_confirm)) 563 continue; 564 /* 565 * But if the cl_confirm's are different, then the only 566 * way that a SETCLIENTID_CONFIRM to pos can succeed is 567 * if new and pos point to the same server: 568 */ 569 found: 570 refcount_inc(&pos->cl_count); 571 spin_unlock(&nn->nfs_client_lock); 572 573 nfs_put_client(prev); 574 prev = pos; 575 576 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 577 switch (status) { 578 case -NFS4ERR_STALE_CLIENTID: 579 break; 580 case 0: 581 nfs4_swap_callback_idents(pos, new); 582 pos->cl_confirm = new->cl_confirm; 583 nfs_mark_client_ready(pos, NFS_CS_READY); 584 585 prev = NULL; 586 *result = pos; 587 goto out; 588 case -ERESTARTSYS: 589 case -ETIMEDOUT: 590 /* The callback path may have been inadvertently 591 * changed. Schedule recovery! 592 */ 593 nfs4_schedule_path_down_recovery(pos); 594 default: 595 goto out; 596 } 597 598 spin_lock(&nn->nfs_client_lock); 599 } 600 out_unlock: 601 spin_unlock(&nn->nfs_client_lock); 602 603 /* No match found. The server lost our clientid */ 604 out: 605 nfs_put_client(prev); 606 return status; 607 } 608 609 #ifdef CONFIG_NFS_V4_1 610 /* 611 * Returns true if the server major ids match 612 */ 613 static bool 614 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 615 struct nfs41_server_owner *o2) 616 { 617 if (o1->major_id_sz != o2->major_id_sz) 618 return false; 619 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 620 } 621 622 /* 623 * Returns true if the server scopes match 624 */ 625 static bool 626 nfs4_check_server_scope(struct nfs41_server_scope *s1, 627 struct nfs41_server_scope *s2) 628 { 629 if (s1->server_scope_sz != s2->server_scope_sz) 630 return false; 631 return memcmp(s1->server_scope, s2->server_scope, 632 s1->server_scope_sz) == 0; 633 } 634 635 /** 636 * nfs4_detect_session_trunking - Checks for session trunking. 637 * 638 * Called after a successful EXCHANGE_ID on a multi-addr connection. 639 * Upon success, add the transport. 640 * 641 * @clp: original mount nfs_client 642 * @res: result structure from an exchange_id using the original mount 643 * nfs_client with a new multi_addr transport 644 * 645 * Returns zero on success, otherwise -EINVAL 646 * 647 * Note: since the exchange_id for the new multi_addr transport uses the 648 * same nfs_client from the original mount, the cl_owner_id is reused, 649 * so eir_clientowner is the same. 650 */ 651 int nfs4_detect_session_trunking(struct nfs_client *clp, 652 struct nfs41_exchange_id_res *res, 653 struct rpc_xprt *xprt) 654 { 655 /* Check eir_clientid */ 656 if (clp->cl_clientid != res->clientid) 657 goto out_err; 658 659 /* Check eir_server_owner so_major_id */ 660 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 661 res->server_owner)) 662 goto out_err; 663 664 /* Check eir_server_owner so_minor_id */ 665 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 666 goto out_err; 667 668 /* Check eir_server_scope */ 669 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 670 goto out_err; 671 672 pr_info("NFS: %s: Session trunking succeeded for %s\n", 673 clp->cl_hostname, 674 xprt->address_strings[RPC_DISPLAY_ADDR]); 675 676 return 0; 677 out_err: 678 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 679 xprt->address_strings[RPC_DISPLAY_ADDR]); 680 681 return -EINVAL; 682 } 683 684 /** 685 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 686 * 687 * @new: nfs_client with client ID to test 688 * @result: OUT: found nfs_client, or new 689 * @cred: credential to use for trunking test 690 * 691 * Returns zero, a negative errno, or a negative NFS4ERR status. 692 * If zero is returned, an nfs_client pointer is planted in "result." 693 * 694 * NB: nfs41_walk_client_list() relies on the new nfs_client being 695 * the last nfs_client on the list. 696 */ 697 int nfs41_walk_client_list(struct nfs_client *new, 698 struct nfs_client **result, 699 struct rpc_cred *cred) 700 { 701 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 702 struct nfs_client *pos, *prev = NULL; 703 int status = -NFS4ERR_STALE_CLIENTID; 704 705 spin_lock(&nn->nfs_client_lock); 706 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 707 708 if (pos == new) 709 goto found; 710 711 status = nfs4_match_client(pos, new, &prev, nn); 712 if (status < 0) 713 goto out; 714 if (status != 0) 715 continue; 716 717 /* 718 * Note that session trunking is just a special subcase of 719 * client id trunking. In either case, we want to fall back 720 * to using the existing nfs_client. 721 */ 722 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 723 new->cl_serverowner)) 724 continue; 725 726 found: 727 refcount_inc(&pos->cl_count); 728 *result = pos; 729 status = 0; 730 break; 731 } 732 733 out: 734 spin_unlock(&nn->nfs_client_lock); 735 nfs_put_client(prev); 736 return status; 737 } 738 #endif /* CONFIG_NFS_V4_1 */ 739 740 static void nfs4_destroy_server(struct nfs_server *server) 741 { 742 nfs_server_return_all_delegations(server); 743 unset_pnfs_layoutdriver(server); 744 nfs4_purge_state_owners(server); 745 } 746 747 /* 748 * NFSv4.0 callback thread helper 749 * 750 * Find a client by callback identifier 751 */ 752 struct nfs_client * 753 nfs4_find_client_ident(struct net *net, int cb_ident) 754 { 755 struct nfs_client *clp; 756 struct nfs_net *nn = net_generic(net, nfs_net_id); 757 758 spin_lock(&nn->nfs_client_lock); 759 clp = idr_find(&nn->cb_ident_idr, cb_ident); 760 if (clp) 761 refcount_inc(&clp->cl_count); 762 spin_unlock(&nn->nfs_client_lock); 763 return clp; 764 } 765 766 #if defined(CONFIG_NFS_V4_1) 767 /* Common match routine for v4.0 and v4.1 callback services */ 768 static bool nfs4_cb_match_client(const struct sockaddr *addr, 769 struct nfs_client *clp, u32 minorversion) 770 { 771 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 772 773 /* Don't match clients that failed to initialise */ 774 if (!(clp->cl_cons_state == NFS_CS_READY || 775 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 776 return false; 777 778 smp_rmb(); 779 780 /* Match the version and minorversion */ 781 if (clp->rpc_ops->version != 4 || 782 clp->cl_minorversion != minorversion) 783 return false; 784 785 /* Match only the IP address, not the port number */ 786 return rpc_cmp_addr(addr, clap); 787 } 788 789 /* 790 * NFSv4.1 callback thread helper 791 * For CB_COMPOUND calls, find a client by IP address, protocol version, 792 * minorversion, and sessionID 793 * 794 * Returns NULL if no such client 795 */ 796 struct nfs_client * 797 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 798 struct nfs4_sessionid *sid, u32 minorversion) 799 { 800 struct nfs_client *clp; 801 struct nfs_net *nn = net_generic(net, nfs_net_id); 802 803 spin_lock(&nn->nfs_client_lock); 804 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 805 if (!nfs4_cb_match_client(addr, clp, minorversion)) 806 continue; 807 808 if (!nfs4_has_session(clp)) 809 continue; 810 811 /* Match sessionid*/ 812 if (memcmp(clp->cl_session->sess_id.data, 813 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 814 continue; 815 816 refcount_inc(&clp->cl_count); 817 spin_unlock(&nn->nfs_client_lock); 818 return clp; 819 } 820 spin_unlock(&nn->nfs_client_lock); 821 return NULL; 822 } 823 824 #else /* CONFIG_NFS_V4_1 */ 825 826 struct nfs_client * 827 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 828 struct nfs4_sessionid *sid, u32 minorversion) 829 { 830 return NULL; 831 } 832 #endif /* CONFIG_NFS_V4_1 */ 833 834 /* 835 * Set up an NFS4 client 836 */ 837 static int nfs4_set_client(struct nfs_server *server, 838 const char *hostname, 839 const struct sockaddr *addr, 840 const size_t addrlen, 841 const char *ip_addr, 842 int proto, const struct rpc_timeout *timeparms, 843 u32 minorversion, struct net *net) 844 { 845 struct nfs_client_initdata cl_init = { 846 .hostname = hostname, 847 .addr = addr, 848 .addrlen = addrlen, 849 .ip_addr = ip_addr, 850 .nfs_mod = &nfs_v4, 851 .proto = proto, 852 .minorversion = minorversion, 853 .net = net, 854 .timeparms = timeparms, 855 }; 856 struct nfs_client *clp; 857 858 if (server->flags & NFS_MOUNT_NORESVPORT) 859 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 860 if (server->options & NFS_OPTION_MIGRATION) 861 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 862 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 863 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags); 864 server->port = rpc_get_port(addr); 865 866 /* Allocate or find a client reference we can use */ 867 clp = nfs_get_client(&cl_init); 868 if (IS_ERR(clp)) 869 return PTR_ERR(clp); 870 871 if (server->nfs_client == clp) 872 return -ELOOP; 873 874 /* 875 * Query for the lease time on clientid setup or renewal 876 * 877 * Note that this will be set on nfs_clients that were created 878 * only for the DS role and did not set this bit, but now will 879 * serve a dual role. 880 */ 881 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 882 883 server->nfs_client = clp; 884 return 0; 885 } 886 887 /* 888 * Set up a pNFS Data Server client. 889 * 890 * Return any existing nfs_client that matches server address,port,version 891 * and minorversion. 892 * 893 * For a new nfs_client, use a soft mount (default), a low retrans and a 894 * low timeout interval so that if a connection is lost, we retry through 895 * the MDS. 896 */ 897 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 898 const struct sockaddr *ds_addr, int ds_addrlen, 899 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 900 u32 minor_version) 901 { 902 struct rpc_timeout ds_timeout; 903 struct nfs_client *mds_clp = mds_srv->nfs_client; 904 struct nfs_client_initdata cl_init = { 905 .addr = ds_addr, 906 .addrlen = ds_addrlen, 907 .nodename = mds_clp->cl_rpcclient->cl_nodename, 908 .ip_addr = mds_clp->cl_ipaddr, 909 .nfs_mod = &nfs_v4, 910 .proto = ds_proto, 911 .minorversion = minor_version, 912 .net = mds_clp->cl_net, 913 .timeparms = &ds_timeout, 914 }; 915 char buf[INET6_ADDRSTRLEN + 1]; 916 917 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0) 918 return ERR_PTR(-EINVAL); 919 cl_init.hostname = buf; 920 921 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 922 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 923 924 /* 925 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 926 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 927 * (section 13.1 RFC 5661). 928 */ 929 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 930 return nfs_get_client(&cl_init); 931 } 932 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 933 934 /* 935 * Session has been established, and the client marked ready. 936 * Set the mount rsize and wsize with negotiated fore channel 937 * attributes which will be bound checked in nfs_server_set_fsinfo. 938 */ 939 static void nfs4_session_set_rwsize(struct nfs_server *server) 940 { 941 #ifdef CONFIG_NFS_V4_1 942 struct nfs4_session *sess; 943 u32 server_resp_sz; 944 u32 server_rqst_sz; 945 946 if (!nfs4_has_session(server->nfs_client)) 947 return; 948 sess = server->nfs_client->cl_session; 949 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 950 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 951 952 if (!server->rsize || server->rsize > server_resp_sz) 953 server->rsize = server_resp_sz; 954 if (!server->wsize || server->wsize > server_rqst_sz) 955 server->wsize = server_rqst_sz; 956 #endif /* CONFIG_NFS_V4_1 */ 957 } 958 959 static int nfs4_server_common_setup(struct nfs_server *server, 960 struct nfs_fh *mntfh, bool auth_probe) 961 { 962 struct nfs_fattr *fattr; 963 int error; 964 965 /* data servers support only a subset of NFSv4.1 */ 966 if (is_ds_only_client(server->nfs_client)) 967 return -EPROTONOSUPPORT; 968 969 fattr = nfs_alloc_fattr(); 970 if (fattr == NULL) 971 return -ENOMEM; 972 973 /* We must ensure the session is initialised first */ 974 error = nfs4_init_session(server->nfs_client); 975 if (error < 0) 976 goto out; 977 978 /* Set the basic capabilities */ 979 server->caps |= server->nfs_client->cl_mvops->init_caps; 980 if (server->flags & NFS_MOUNT_NORDIRPLUS) 981 server->caps &= ~NFS_CAP_READDIRPLUS; 982 /* 983 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 984 * authentication. 985 */ 986 if (nfs4_disable_idmapping && 987 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 988 server->caps |= NFS_CAP_UIDGID_NOMAP; 989 990 991 /* Probe the root fh to retrieve its FSID and filehandle */ 992 error = nfs4_get_rootfh(server, mntfh, auth_probe); 993 if (error < 0) 994 goto out; 995 996 dprintk("Server FSID: %llx:%llx\n", 997 (unsigned long long) server->fsid.major, 998 (unsigned long long) server->fsid.minor); 999 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 1000 1001 nfs4_session_set_rwsize(server); 1002 1003 error = nfs_probe_fsinfo(server, mntfh, fattr); 1004 if (error < 0) 1005 goto out; 1006 1007 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1008 server->namelen = NFS4_MAXNAMLEN; 1009 1010 nfs_server_insert_lists(server); 1011 server->mount_time = jiffies; 1012 server->destroy = nfs4_destroy_server; 1013 out: 1014 nfs_free_fattr(fattr); 1015 return error; 1016 } 1017 1018 /* 1019 * Create a version 4 volume record 1020 */ 1021 static int nfs4_init_server(struct nfs_server *server, 1022 struct nfs_parsed_mount_data *data) 1023 { 1024 struct rpc_timeout timeparms; 1025 int error; 1026 1027 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1028 data->timeo, data->retrans); 1029 1030 /* Initialise the client representation from the mount data */ 1031 server->flags = data->flags; 1032 server->options = data->options; 1033 server->auth_info = data->auth_info; 1034 1035 /* Use the first specified auth flavor. If this flavor isn't 1036 * allowed by the server, use the SECINFO path to try the 1037 * other specified flavors */ 1038 if (data->auth_info.flavor_len >= 1) 1039 data->selected_flavor = data->auth_info.flavors[0]; 1040 else 1041 data->selected_flavor = RPC_AUTH_UNIX; 1042 1043 /* Get a client record */ 1044 error = nfs4_set_client(server, 1045 data->nfs_server.hostname, 1046 (const struct sockaddr *)&data->nfs_server.address, 1047 data->nfs_server.addrlen, 1048 data->client_address, 1049 data->nfs_server.protocol, 1050 &timeparms, 1051 data->minorversion, 1052 data->net); 1053 if (error < 0) 1054 return error; 1055 1056 if (data->rsize) 1057 server->rsize = nfs_block_size(data->rsize, NULL); 1058 if (data->wsize) 1059 server->wsize = nfs_block_size(data->wsize, NULL); 1060 1061 server->acregmin = data->acregmin * HZ; 1062 server->acregmax = data->acregmax * HZ; 1063 server->acdirmin = data->acdirmin * HZ; 1064 server->acdirmax = data->acdirmax * HZ; 1065 server->port = data->nfs_server.port; 1066 1067 return nfs_init_server_rpcclient(server, &timeparms, 1068 data->selected_flavor); 1069 } 1070 1071 /* 1072 * Create a version 4 volume record 1073 * - keyed on server and FSID 1074 */ 1075 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1076 struct nfs_fh *mntfh)*/ 1077 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 1078 struct nfs_subversion *nfs_mod) 1079 { 1080 struct nfs_server *server; 1081 bool auth_probe; 1082 int error; 1083 1084 server = nfs_alloc_server(); 1085 if (!server) 1086 return ERR_PTR(-ENOMEM); 1087 1088 auth_probe = mount_info->parsed->auth_info.flavor_len < 1; 1089 1090 /* set up the general RPC client */ 1091 error = nfs4_init_server(server, mount_info->parsed); 1092 if (error < 0) 1093 goto error; 1094 1095 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe); 1096 if (error < 0) 1097 goto error; 1098 1099 return server; 1100 1101 error: 1102 nfs_free_server(server); 1103 return ERR_PTR(error); 1104 } 1105 1106 /* 1107 * Create an NFS4 referral server record 1108 */ 1109 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1110 struct nfs_fh *mntfh) 1111 { 1112 struct nfs_client *parent_client; 1113 struct nfs_server *server, *parent_server; 1114 bool auth_probe; 1115 int error; 1116 1117 server = nfs_alloc_server(); 1118 if (!server) 1119 return ERR_PTR(-ENOMEM); 1120 1121 parent_server = NFS_SB(data->sb); 1122 parent_client = parent_server->nfs_client; 1123 1124 /* Initialise the client representation from the parent server */ 1125 nfs_server_copy_userdata(server, parent_server); 1126 1127 /* Get a client representation */ 1128 #ifdef CONFIG_SUNRPC_XPRT_RDMA 1129 rpc_set_port(data->addr, NFS_RDMA_PORT); 1130 error = nfs4_set_client(server, data->hostname, 1131 data->addr, 1132 data->addrlen, 1133 parent_client->cl_ipaddr, 1134 XPRT_TRANSPORT_RDMA, 1135 parent_server->client->cl_timeout, 1136 parent_client->cl_mvops->minor_version, 1137 parent_client->cl_net); 1138 if (!error) 1139 goto init_server; 1140 #endif /* CONFIG_SUNRPC_XPRT_RDMA */ 1141 1142 rpc_set_port(data->addr, NFS_PORT); 1143 error = nfs4_set_client(server, data->hostname, 1144 data->addr, 1145 data->addrlen, 1146 parent_client->cl_ipaddr, 1147 XPRT_TRANSPORT_TCP, 1148 parent_server->client->cl_timeout, 1149 parent_client->cl_mvops->minor_version, 1150 parent_client->cl_net); 1151 if (error < 0) 1152 goto error; 1153 1154 #ifdef CONFIG_SUNRPC_XPRT_RDMA 1155 init_server: 1156 #endif 1157 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1158 if (error < 0) 1159 goto error; 1160 1161 auth_probe = parent_server->auth_info.flavor_len < 1; 1162 1163 error = nfs4_server_common_setup(server, mntfh, auth_probe); 1164 if (error < 0) 1165 goto error; 1166 1167 return server; 1168 1169 error: 1170 nfs_free_server(server); 1171 return ERR_PTR(error); 1172 } 1173 1174 /* 1175 * Grab the destination's particulars, including lease expiry time. 1176 * 1177 * Returns zero if probe succeeded and retrieved FSID matches the FSID 1178 * we have cached. 1179 */ 1180 static int nfs_probe_destination(struct nfs_server *server) 1181 { 1182 struct inode *inode = d_inode(server->super->s_root); 1183 struct nfs_fattr *fattr; 1184 int error; 1185 1186 fattr = nfs_alloc_fattr(); 1187 if (fattr == NULL) 1188 return -ENOMEM; 1189 1190 /* Sanity: the probe won't work if the destination server 1191 * does not recognize the migrated FH. */ 1192 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr); 1193 1194 nfs_free_fattr(fattr); 1195 return error; 1196 } 1197 1198 /** 1199 * nfs4_update_server - Move an nfs_server to a different nfs_client 1200 * 1201 * @server: represents FSID to be moved 1202 * @hostname: new end-point's hostname 1203 * @sap: new end-point's socket address 1204 * @salen: size of "sap" 1205 * @net: net namespace 1206 * 1207 * The nfs_server must be quiescent before this function is invoked. 1208 * Either its session is drained (NFSv4.1+), or its transport is 1209 * plugged and drained (NFSv4.0). 1210 * 1211 * Returns zero on success, or a negative errno value. 1212 */ 1213 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1214 struct sockaddr *sap, size_t salen, struct net *net) 1215 { 1216 struct nfs_client *clp = server->nfs_client; 1217 struct rpc_clnt *clnt = server->client; 1218 struct xprt_create xargs = { 1219 .ident = clp->cl_proto, 1220 .net = net, 1221 .dstaddr = sap, 1222 .addrlen = salen, 1223 .servername = hostname, 1224 }; 1225 char buf[INET6_ADDRSTRLEN + 1]; 1226 struct sockaddr_storage address; 1227 struct sockaddr *localaddr = (struct sockaddr *)&address; 1228 int error; 1229 1230 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1231 if (error != 0) 1232 return error; 1233 1234 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1235 if (error != 0) 1236 return error; 1237 1238 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1239 return -EAFNOSUPPORT; 1240 1241 nfs_server_remove_lists(server); 1242 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1243 error = nfs4_set_client(server, hostname, sap, salen, buf, 1244 clp->cl_proto, clnt->cl_timeout, 1245 clp->cl_minorversion, net); 1246 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1247 nfs_put_client(clp); 1248 if (error != 0) { 1249 nfs_server_insert_lists(server); 1250 return error; 1251 } 1252 1253 if (server->nfs_client->cl_hostname == NULL) 1254 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1255 nfs_server_insert_lists(server); 1256 1257 return nfs_probe_destination(server); 1258 } 1259