1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 */ 6 #include <linux/module.h> 7 #include <linux/nfs_fs.h> 8 #include <linux/nfs_mount.h> 9 #include <linux/sunrpc/addr.h> 10 #include <linux/sunrpc/auth.h> 11 #include <linux/sunrpc/xprt.h> 12 #include <linux/sunrpc/bc_xprt.h> 13 #include <linux/sunrpc/rpc_pipe_fs.h> 14 #include "internal.h" 15 #include "callback.h" 16 #include "delegation.h" 17 #include "nfs4session.h" 18 #include "nfs4idmap.h" 19 #include "pnfs.h" 20 #include "netns.h" 21 22 #define NFSDBG_FACILITY NFSDBG_CLIENT 23 24 /* 25 * Get a unique NFSv4.0 callback identifier which will be used 26 * by the V4.0 callback service to lookup the nfs_client struct 27 */ 28 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 29 { 30 int ret = 0; 31 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 32 33 if (clp->rpc_ops->version != 4 || minorversion != 0) 34 return ret; 35 idr_preload(GFP_KERNEL); 36 spin_lock(&nn->nfs_client_lock); 37 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT); 38 if (ret >= 0) 39 clp->cl_cb_ident = ret; 40 spin_unlock(&nn->nfs_client_lock); 41 idr_preload_end(); 42 return ret < 0 ? ret : 0; 43 } 44 45 #ifdef CONFIG_NFS_V4_1 46 /* 47 * Per auth flavor data server rpc clients 48 */ 49 struct nfs4_ds_server { 50 struct list_head list; /* ds_clp->cl_ds_clients */ 51 struct rpc_clnt *rpc_clnt; 52 }; 53 54 /** 55 * nfs4_find_ds_client - Common lookup case for DS I/O 56 * @ds_clp: pointer to the DS's nfs_client 57 * @flavor: rpc auth flavour to match 58 */ 59 static struct nfs4_ds_server * 60 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 61 { 62 struct nfs4_ds_server *dss; 63 64 rcu_read_lock(); 65 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) { 66 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 67 continue; 68 goto out; 69 } 70 dss = NULL; 71 out: 72 rcu_read_unlock(); 73 return dss; 74 } 75 76 static struct nfs4_ds_server * 77 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor, 78 struct nfs4_ds_server *new) 79 { 80 struct nfs4_ds_server *dss; 81 82 spin_lock(&ds_clp->cl_lock); 83 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) { 84 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 85 continue; 86 goto out; 87 } 88 if (new) 89 list_add_rcu(&new->list, &ds_clp->cl_ds_clients); 90 dss = new; 91 out: 92 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ 93 return dss; 94 } 95 96 static struct nfs4_ds_server * 97 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 98 { 99 struct nfs4_ds_server *dss; 100 101 dss = kmalloc(sizeof(*dss), GFP_NOFS); 102 if (dss == NULL) 103 return ERR_PTR(-ENOMEM); 104 105 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor); 106 if (IS_ERR(dss->rpc_clnt)) { 107 int err = PTR_ERR(dss->rpc_clnt); 108 kfree (dss); 109 return ERR_PTR(err); 110 } 111 INIT_LIST_HEAD(&dss->list); 112 113 return dss; 114 } 115 116 static void 117 nfs4_free_ds_server(struct nfs4_ds_server *dss) 118 { 119 rpc_release_client(dss->rpc_clnt); 120 kfree(dss); 121 } 122 123 /** 124 * nfs4_find_or_create_ds_client - Find or create a DS rpc client 125 * @ds_clp: pointer to the DS's nfs_client 126 * @inode: pointer to the inode 127 * 128 * Find or create a DS rpc client with th MDS server rpc client auth flavor 129 * in the nfs_client cl_ds_clients list. 130 */ 131 struct rpc_clnt * 132 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode) 133 { 134 struct nfs4_ds_server *dss, *new; 135 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor; 136 137 dss = nfs4_find_ds_client(ds_clp, flavor); 138 if (dss != NULL) 139 goto out; 140 new = nfs4_alloc_ds_server(ds_clp, flavor); 141 if (IS_ERR(new)) 142 return ERR_CAST(new); 143 dss = nfs4_add_ds_client(ds_clp, flavor, new); 144 if (dss != new) 145 nfs4_free_ds_server(new); 146 out: 147 return dss->rpc_clnt; 148 } 149 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); 150 151 static void 152 nfs4_shutdown_ds_clients(struct nfs_client *clp) 153 { 154 struct nfs4_ds_server *dss; 155 156 while (!list_empty(&clp->cl_ds_clients)) { 157 dss = list_entry(clp->cl_ds_clients.next, 158 struct nfs4_ds_server, list); 159 list_del(&dss->list); 160 rpc_shutdown_client(dss->rpc_clnt); 161 kfree (dss); 162 } 163 } 164 165 static void 166 nfs4_cleanup_callback(struct nfs_client *clp) 167 { 168 struct nfs4_copy_state *cp_state; 169 170 while (!list_empty(&clp->pending_cb_stateids)) { 171 cp_state = list_entry(clp->pending_cb_stateids.next, 172 struct nfs4_copy_state, copies); 173 list_del(&cp_state->copies); 174 kfree(cp_state); 175 } 176 } 177 178 void nfs41_shutdown_client(struct nfs_client *clp) 179 { 180 if (nfs4_has_session(clp)) { 181 nfs4_cleanup_callback(clp); 182 nfs4_shutdown_ds_clients(clp); 183 nfs4_destroy_session(clp->cl_session); 184 nfs4_destroy_clientid(clp); 185 } 186 187 } 188 #endif /* CONFIG_NFS_V4_1 */ 189 190 void nfs40_shutdown_client(struct nfs_client *clp) 191 { 192 if (clp->cl_slot_tbl) { 193 nfs4_shutdown_slot_table(clp->cl_slot_tbl); 194 kfree(clp->cl_slot_tbl); 195 } 196 } 197 198 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) 199 { 200 int err; 201 struct nfs_client *clp = nfs_alloc_client(cl_init); 202 if (IS_ERR(clp)) 203 return clp; 204 205 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 206 if (err) 207 goto error; 208 209 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) { 210 err = -EINVAL; 211 goto error; 212 } 213 214 spin_lock_init(&clp->cl_lock); 215 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 216 INIT_LIST_HEAD(&clp->cl_ds_clients); 217 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 218 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 219 clp->cl_minorversion = cl_init->minorversion; 220 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 221 clp->cl_mig_gen = 1; 222 #if IS_ENABLED(CONFIG_NFS_V4_1) 223 init_waitqueue_head(&clp->cl_lock_waitq); 224 #endif 225 INIT_LIST_HEAD(&clp->pending_cb_stateids); 226 return clp; 227 228 error: 229 nfs_free_client(clp); 230 return ERR_PTR(err); 231 } 232 233 /* 234 * Destroy the NFS4 callback service 235 */ 236 static void nfs4_destroy_callback(struct nfs_client *clp) 237 { 238 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 239 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 240 } 241 242 static void nfs4_shutdown_client(struct nfs_client *clp) 243 { 244 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 245 nfs4_kill_renewd(clp); 246 clp->cl_mvops->shutdown_client(clp); 247 nfs4_destroy_callback(clp); 248 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 249 nfs_idmap_delete(clp); 250 251 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 252 kfree(clp->cl_serverowner); 253 kfree(clp->cl_serverscope); 254 kfree(clp->cl_implid); 255 kfree(clp->cl_owner_id); 256 } 257 258 void nfs4_free_client(struct nfs_client *clp) 259 { 260 nfs4_shutdown_client(clp); 261 nfs_free_client(clp); 262 } 263 264 /* 265 * Initialize the NFS4 callback service 266 */ 267 static int nfs4_init_callback(struct nfs_client *clp) 268 { 269 struct rpc_xprt *xprt; 270 int error; 271 272 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 273 274 if (nfs4_has_session(clp)) { 275 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 276 if (error < 0) 277 return error; 278 } 279 280 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 281 if (error < 0) { 282 dprintk("%s: failed to start callback. Error = %d\n", 283 __func__, error); 284 return error; 285 } 286 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 287 288 return 0; 289 } 290 291 /** 292 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 293 * @clp: nfs_client to initialize 294 * 295 * Returns zero on success, or a negative errno if some error occurred. 296 */ 297 int nfs40_init_client(struct nfs_client *clp) 298 { 299 struct nfs4_slot_table *tbl; 300 int ret; 301 302 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 303 if (tbl == NULL) 304 return -ENOMEM; 305 306 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 307 "NFSv4.0 transport Slot table"); 308 if (ret) { 309 kfree(tbl); 310 return ret; 311 } 312 313 clp->cl_slot_tbl = tbl; 314 return 0; 315 } 316 317 #if defined(CONFIG_NFS_V4_1) 318 319 /** 320 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 321 * @clp: nfs_client to initialize 322 * 323 * Returns zero on success, or a negative errno if some error occurred. 324 */ 325 int nfs41_init_client(struct nfs_client *clp) 326 { 327 struct nfs4_session *session = NULL; 328 329 /* 330 * Create the session and mark it expired. 331 * When a SEQUENCE operation encounters the expired session 332 * it will do session recovery to initialize it. 333 */ 334 session = nfs4_alloc_session(clp); 335 if (!session) 336 return -ENOMEM; 337 338 clp->cl_session = session; 339 340 /* 341 * The create session reply races with the server back 342 * channel probe. Mark the client NFS_CS_SESSION_INITING 343 * so that the client back channel can find the 344 * nfs_client struct 345 */ 346 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 347 return 0; 348 } 349 350 #endif /* CONFIG_NFS_V4_1 */ 351 352 /* 353 * Initialize the minor version specific parts of an NFS4 client record 354 */ 355 static int nfs4_init_client_minor_version(struct nfs_client *clp) 356 { 357 int ret; 358 359 ret = clp->cl_mvops->init_client(clp); 360 if (ret) 361 return ret; 362 return nfs4_init_callback(clp); 363 } 364 365 /** 366 * nfs4_init_client - Initialise an NFS4 client record 367 * 368 * @clp: nfs_client to initialise 369 * @cl_init: pointer to nfs_client_initdata 370 * 371 * Returns pointer to an NFS client, or an ERR_PTR value. 372 */ 373 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 374 const struct nfs_client_initdata *cl_init) 375 { 376 char buf[INET6_ADDRSTRLEN + 1]; 377 const char *ip_addr = cl_init->ip_addr; 378 struct nfs_client *old; 379 int error; 380 381 if (clp->cl_cons_state == NFS_CS_READY) 382 /* the client is initialised already */ 383 return clp; 384 385 /* Check NFS protocol revision and initialize RPC op vector */ 386 clp->rpc_ops = &nfs_v4_clientops; 387 388 if (clp->cl_minorversion != 0) 389 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 390 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 391 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 392 393 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 394 if (error == -EINVAL) 395 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 396 if (error < 0) 397 goto error; 398 399 /* If no clientaddr= option was specified, find a usable cb address */ 400 if (ip_addr == NULL) { 401 struct sockaddr_storage cb_addr; 402 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 403 404 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 405 if (error < 0) 406 goto error; 407 error = rpc_ntop(sap, buf, sizeof(buf)); 408 if (error < 0) 409 goto error; 410 ip_addr = (const char *)buf; 411 } 412 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 413 414 error = nfs_idmap_new(clp); 415 if (error < 0) { 416 dprintk("%s: failed to create idmapper. Error = %d\n", 417 __func__, error); 418 goto error; 419 } 420 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 421 422 error = nfs4_init_client_minor_version(clp); 423 if (error < 0) 424 goto error; 425 426 error = nfs4_discover_server_trunking(clp, &old); 427 if (error < 0) 428 goto error; 429 430 if (clp != old) { 431 clp->cl_preserve_clid = true; 432 /* 433 * Mark the client as having failed initialization so other 434 * processes walking the nfs_client_list in nfs_match_client() 435 * won't try to use it. 436 */ 437 nfs_mark_client_ready(clp, -EPERM); 438 } 439 nfs_put_client(clp); 440 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 441 return old; 442 443 error: 444 nfs_mark_client_ready(clp, error); 445 nfs_put_client(clp); 446 return ERR_PTR(error); 447 } 448 449 /* 450 * SETCLIENTID just did a callback update with the callback ident in 451 * "drop," but server trunking discovery claims "drop" and "keep" are 452 * actually the same server. Swap the callback IDs so that "keep" 453 * will continue to use the callback ident the server now knows about, 454 * and so that "keep"'s original callback ident is destroyed when 455 * "drop" is freed. 456 */ 457 static void nfs4_swap_callback_idents(struct nfs_client *keep, 458 struct nfs_client *drop) 459 { 460 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 461 unsigned int save = keep->cl_cb_ident; 462 463 if (keep->cl_cb_ident == drop->cl_cb_ident) 464 return; 465 466 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 467 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 468 469 spin_lock(&nn->nfs_client_lock); 470 471 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 472 keep->cl_cb_ident = drop->cl_cb_ident; 473 474 idr_replace(&nn->cb_ident_idr, drop, save); 475 drop->cl_cb_ident = save; 476 477 spin_unlock(&nn->nfs_client_lock); 478 } 479 480 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 481 const struct nfs_client *clp2) 482 { 483 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 484 return true; 485 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 486 } 487 488 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 489 { 490 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 491 } 492 493 static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 494 struct nfs_client **prev, struct nfs_net *nn) 495 { 496 int status; 497 498 if (pos->rpc_ops != new->rpc_ops) 499 return 1; 500 501 if (pos->cl_minorversion != new->cl_minorversion) 502 return 1; 503 504 /* If "pos" isn't marked ready, we can't trust the 505 * remaining fields in "pos", especially the client 506 * ID and serverowner fields. Wait for CREATE_SESSION 507 * to finish. */ 508 if (pos->cl_cons_state > NFS_CS_READY) { 509 refcount_inc(&pos->cl_count); 510 spin_unlock(&nn->nfs_client_lock); 511 512 nfs_put_client(*prev); 513 *prev = pos; 514 515 status = nfs_wait_client_init_complete(pos); 516 spin_lock(&nn->nfs_client_lock); 517 518 if (status < 0) 519 return status; 520 } 521 522 if (pos->cl_cons_state != NFS_CS_READY) 523 return 1; 524 525 if (pos->cl_clientid != new->cl_clientid) 526 return 1; 527 528 /* NFSv4.1 always uses the uniform string, however someone 529 * might switch the uniquifier string on us. 530 */ 531 if (!nfs4_match_client_owner_id(pos, new)) 532 return 1; 533 534 return 0; 535 } 536 537 /** 538 * nfs40_walk_client_list - Find server that recognizes a client ID 539 * 540 * @new: nfs_client with client ID to test 541 * @result: OUT: found nfs_client, or new 542 * @cred: credential to use for trunking test 543 * 544 * Returns zero, a negative errno, or a negative NFS4ERR status. 545 * If zero is returned, an nfs_client pointer is planted in "result." 546 * 547 * NB: nfs40_walk_client_list() relies on the new nfs_client being 548 * the last nfs_client on the list. 549 */ 550 int nfs40_walk_client_list(struct nfs_client *new, 551 struct nfs_client **result, 552 const struct cred *cred) 553 { 554 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 555 struct nfs_client *pos, *prev = NULL; 556 struct nfs4_setclientid_res clid = { 557 .clientid = new->cl_clientid, 558 .confirm = new->cl_confirm, 559 }; 560 int status = -NFS4ERR_STALE_CLIENTID; 561 562 spin_lock(&nn->nfs_client_lock); 563 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 564 565 if (pos == new) 566 goto found; 567 568 status = nfs4_match_client(pos, new, &prev, nn); 569 if (status < 0) 570 goto out_unlock; 571 if (status != 0) 572 continue; 573 /* 574 * We just sent a new SETCLIENTID, which should have 575 * caused the server to return a new cl_confirm. So if 576 * cl_confirm is the same, then this is a different 577 * server that just returned the same cl_confirm by 578 * coincidence: 579 */ 580 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 581 &new->cl_confirm)) 582 continue; 583 /* 584 * But if the cl_confirm's are different, then the only 585 * way that a SETCLIENTID_CONFIRM to pos can succeed is 586 * if new and pos point to the same server: 587 */ 588 found: 589 refcount_inc(&pos->cl_count); 590 spin_unlock(&nn->nfs_client_lock); 591 592 nfs_put_client(prev); 593 prev = pos; 594 595 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 596 switch (status) { 597 case -NFS4ERR_STALE_CLIENTID: 598 break; 599 case 0: 600 nfs4_swap_callback_idents(pos, new); 601 pos->cl_confirm = new->cl_confirm; 602 nfs_mark_client_ready(pos, NFS_CS_READY); 603 604 prev = NULL; 605 *result = pos; 606 goto out; 607 case -ERESTARTSYS: 608 case -ETIMEDOUT: 609 /* The callback path may have been inadvertently 610 * changed. Schedule recovery! 611 */ 612 nfs4_schedule_path_down_recovery(pos); 613 default: 614 goto out; 615 } 616 617 spin_lock(&nn->nfs_client_lock); 618 } 619 out_unlock: 620 spin_unlock(&nn->nfs_client_lock); 621 622 /* No match found. The server lost our clientid */ 623 out: 624 nfs_put_client(prev); 625 return status; 626 } 627 628 #ifdef CONFIG_NFS_V4_1 629 /* 630 * Returns true if the server major ids match 631 */ 632 static bool 633 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 634 struct nfs41_server_owner *o2) 635 { 636 if (o1->major_id_sz != o2->major_id_sz) 637 return false; 638 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 639 } 640 641 /* 642 * Returns true if the server scopes match 643 */ 644 static bool 645 nfs4_check_server_scope(struct nfs41_server_scope *s1, 646 struct nfs41_server_scope *s2) 647 { 648 if (s1->server_scope_sz != s2->server_scope_sz) 649 return false; 650 return memcmp(s1->server_scope, s2->server_scope, 651 s1->server_scope_sz) == 0; 652 } 653 654 /** 655 * nfs4_detect_session_trunking - Checks for session trunking. 656 * @clp: original mount nfs_client 657 * @res: result structure from an exchange_id using the original mount 658 * nfs_client with a new multi_addr transport 659 * @xprt: pointer to the transport to add. 660 * 661 * Called after a successful EXCHANGE_ID on a multi-addr connection. 662 * Upon success, add the transport. 663 * 664 * Returns zero on success, otherwise -EINVAL 665 * 666 * Note: since the exchange_id for the new multi_addr transport uses the 667 * same nfs_client from the original mount, the cl_owner_id is reused, 668 * so eir_clientowner is the same. 669 */ 670 int nfs4_detect_session_trunking(struct nfs_client *clp, 671 struct nfs41_exchange_id_res *res, 672 struct rpc_xprt *xprt) 673 { 674 /* Check eir_clientid */ 675 if (clp->cl_clientid != res->clientid) 676 goto out_err; 677 678 /* Check eir_server_owner so_major_id */ 679 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 680 res->server_owner)) 681 goto out_err; 682 683 /* Check eir_server_owner so_minor_id */ 684 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 685 goto out_err; 686 687 /* Check eir_server_scope */ 688 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 689 goto out_err; 690 691 pr_info("NFS: %s: Session trunking succeeded for %s\n", 692 clp->cl_hostname, 693 xprt->address_strings[RPC_DISPLAY_ADDR]); 694 695 return 0; 696 out_err: 697 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 698 xprt->address_strings[RPC_DISPLAY_ADDR]); 699 700 return -EINVAL; 701 } 702 703 /** 704 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 705 * 706 * @new: nfs_client with client ID to test 707 * @result: OUT: found nfs_client, or new 708 * @cred: credential to use for trunking test 709 * 710 * Returns zero, a negative errno, or a negative NFS4ERR status. 711 * If zero is returned, an nfs_client pointer is planted in "result." 712 * 713 * NB: nfs41_walk_client_list() relies on the new nfs_client being 714 * the last nfs_client on the list. 715 */ 716 int nfs41_walk_client_list(struct nfs_client *new, 717 struct nfs_client **result, 718 const struct cred *cred) 719 { 720 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 721 struct nfs_client *pos, *prev = NULL; 722 int status = -NFS4ERR_STALE_CLIENTID; 723 724 spin_lock(&nn->nfs_client_lock); 725 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 726 727 if (pos == new) 728 goto found; 729 730 status = nfs4_match_client(pos, new, &prev, nn); 731 if (status < 0) 732 goto out; 733 if (status != 0) 734 continue; 735 736 /* 737 * Note that session trunking is just a special subcase of 738 * client id trunking. In either case, we want to fall back 739 * to using the existing nfs_client. 740 */ 741 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 742 new->cl_serverowner)) 743 continue; 744 745 found: 746 refcount_inc(&pos->cl_count); 747 *result = pos; 748 status = 0; 749 break; 750 } 751 752 out: 753 spin_unlock(&nn->nfs_client_lock); 754 nfs_put_client(prev); 755 return status; 756 } 757 #endif /* CONFIG_NFS_V4_1 */ 758 759 static void nfs4_destroy_server(struct nfs_server *server) 760 { 761 nfs_server_return_all_delegations(server); 762 unset_pnfs_layoutdriver(server); 763 nfs4_purge_state_owners(server); 764 } 765 766 /* 767 * NFSv4.0 callback thread helper 768 * 769 * Find a client by callback identifier 770 */ 771 struct nfs_client * 772 nfs4_find_client_ident(struct net *net, int cb_ident) 773 { 774 struct nfs_client *clp; 775 struct nfs_net *nn = net_generic(net, nfs_net_id); 776 777 spin_lock(&nn->nfs_client_lock); 778 clp = idr_find(&nn->cb_ident_idr, cb_ident); 779 if (clp) 780 refcount_inc(&clp->cl_count); 781 spin_unlock(&nn->nfs_client_lock); 782 return clp; 783 } 784 785 #if defined(CONFIG_NFS_V4_1) 786 /* Common match routine for v4.0 and v4.1 callback services */ 787 static bool nfs4_cb_match_client(const struct sockaddr *addr, 788 struct nfs_client *clp, u32 minorversion) 789 { 790 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 791 792 /* Don't match clients that failed to initialise */ 793 if (!(clp->cl_cons_state == NFS_CS_READY || 794 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 795 return false; 796 797 smp_rmb(); 798 799 /* Match the version and minorversion */ 800 if (clp->rpc_ops->version != 4 || 801 clp->cl_minorversion != minorversion) 802 return false; 803 804 /* Match only the IP address, not the port number */ 805 return rpc_cmp_addr(addr, clap); 806 } 807 808 /* 809 * NFSv4.1 callback thread helper 810 * For CB_COMPOUND calls, find a client by IP address, protocol version, 811 * minorversion, and sessionID 812 * 813 * Returns NULL if no such client 814 */ 815 struct nfs_client * 816 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 817 struct nfs4_sessionid *sid, u32 minorversion) 818 { 819 struct nfs_client *clp; 820 struct nfs_net *nn = net_generic(net, nfs_net_id); 821 822 spin_lock(&nn->nfs_client_lock); 823 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 824 if (!nfs4_cb_match_client(addr, clp, minorversion)) 825 continue; 826 827 if (!nfs4_has_session(clp)) 828 continue; 829 830 /* Match sessionid*/ 831 if (memcmp(clp->cl_session->sess_id.data, 832 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 833 continue; 834 835 refcount_inc(&clp->cl_count); 836 spin_unlock(&nn->nfs_client_lock); 837 return clp; 838 } 839 spin_unlock(&nn->nfs_client_lock); 840 return NULL; 841 } 842 843 #else /* CONFIG_NFS_V4_1 */ 844 845 struct nfs_client * 846 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 847 struct nfs4_sessionid *sid, u32 minorversion) 848 { 849 return NULL; 850 } 851 #endif /* CONFIG_NFS_V4_1 */ 852 853 /* 854 * Set up an NFS4 client 855 */ 856 static int nfs4_set_client(struct nfs_server *server, 857 const char *hostname, 858 const struct sockaddr *addr, 859 const size_t addrlen, 860 const char *ip_addr, 861 int proto, const struct rpc_timeout *timeparms, 862 u32 minorversion, struct net *net) 863 { 864 struct nfs_client_initdata cl_init = { 865 .hostname = hostname, 866 .addr = addr, 867 .addrlen = addrlen, 868 .ip_addr = ip_addr, 869 .nfs_mod = &nfs_v4, 870 .proto = proto, 871 .minorversion = minorversion, 872 .net = net, 873 .timeparms = timeparms, 874 .cred = server->cred, 875 }; 876 struct nfs_client *clp; 877 878 if (server->flags & NFS_MOUNT_NORESVPORT) 879 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 880 if (server->options & NFS_OPTION_MIGRATION) 881 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 882 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 883 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags); 884 server->port = rpc_get_port(addr); 885 886 /* Allocate or find a client reference we can use */ 887 clp = nfs_get_client(&cl_init); 888 if (IS_ERR(clp)) 889 return PTR_ERR(clp); 890 891 if (server->nfs_client == clp) { 892 nfs_put_client(clp); 893 return -ELOOP; 894 } 895 896 /* 897 * Query for the lease time on clientid setup or renewal 898 * 899 * Note that this will be set on nfs_clients that were created 900 * only for the DS role and did not set this bit, but now will 901 * serve a dual role. 902 */ 903 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 904 905 server->nfs_client = clp; 906 return 0; 907 } 908 909 /* 910 * Set up a pNFS Data Server client. 911 * 912 * Return any existing nfs_client that matches server address,port,version 913 * and minorversion. 914 * 915 * For a new nfs_client, use a soft mount (default), a low retrans and a 916 * low timeout interval so that if a connection is lost, we retry through 917 * the MDS. 918 */ 919 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 920 const struct sockaddr *ds_addr, int ds_addrlen, 921 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 922 u32 minor_version) 923 { 924 struct rpc_timeout ds_timeout; 925 struct nfs_client *mds_clp = mds_srv->nfs_client; 926 struct nfs_client_initdata cl_init = { 927 .addr = ds_addr, 928 .addrlen = ds_addrlen, 929 .nodename = mds_clp->cl_rpcclient->cl_nodename, 930 .ip_addr = mds_clp->cl_ipaddr, 931 .nfs_mod = &nfs_v4, 932 .proto = ds_proto, 933 .minorversion = minor_version, 934 .net = mds_clp->cl_net, 935 .timeparms = &ds_timeout, 936 .cred = mds_srv->cred, 937 }; 938 char buf[INET6_ADDRSTRLEN + 1]; 939 940 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0) 941 return ERR_PTR(-EINVAL); 942 cl_init.hostname = buf; 943 944 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 945 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 946 947 /* 948 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 949 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 950 * (section 13.1 RFC 5661). 951 */ 952 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 953 return nfs_get_client(&cl_init); 954 } 955 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 956 957 /* 958 * Session has been established, and the client marked ready. 959 * Limit the mount rsize, wsize and dtsize using negotiated fore 960 * channel attributes. 961 */ 962 static void nfs4_session_limit_rwsize(struct nfs_server *server) 963 { 964 #ifdef CONFIG_NFS_V4_1 965 struct nfs4_session *sess; 966 u32 server_resp_sz; 967 u32 server_rqst_sz; 968 969 if (!nfs4_has_session(server->nfs_client)) 970 return; 971 sess = server->nfs_client->cl_session; 972 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 973 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 974 975 if (server->dtsize > server_resp_sz) 976 server->dtsize = server_resp_sz; 977 if (server->rsize > server_resp_sz) 978 server->rsize = server_resp_sz; 979 if (server->wsize > server_rqst_sz) 980 server->wsize = server_rqst_sz; 981 #endif /* CONFIG_NFS_V4_1 */ 982 } 983 984 static int nfs4_server_common_setup(struct nfs_server *server, 985 struct nfs_fh *mntfh, bool auth_probe) 986 { 987 struct nfs_fattr *fattr; 988 int error; 989 990 /* data servers support only a subset of NFSv4.1 */ 991 if (is_ds_only_client(server->nfs_client)) 992 return -EPROTONOSUPPORT; 993 994 fattr = nfs_alloc_fattr(); 995 if (fattr == NULL) 996 return -ENOMEM; 997 998 /* We must ensure the session is initialised first */ 999 error = nfs4_init_session(server->nfs_client); 1000 if (error < 0) 1001 goto out; 1002 1003 /* Set the basic capabilities */ 1004 server->caps |= server->nfs_client->cl_mvops->init_caps; 1005 if (server->flags & NFS_MOUNT_NORDIRPLUS) 1006 server->caps &= ~NFS_CAP_READDIRPLUS; 1007 /* 1008 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1009 * authentication. 1010 */ 1011 if (nfs4_disable_idmapping && 1012 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 1013 server->caps |= NFS_CAP_UIDGID_NOMAP; 1014 1015 1016 /* Probe the root fh to retrieve its FSID and filehandle */ 1017 error = nfs4_get_rootfh(server, mntfh, auth_probe); 1018 if (error < 0) 1019 goto out; 1020 1021 dprintk("Server FSID: %llx:%llx\n", 1022 (unsigned long long) server->fsid.major, 1023 (unsigned long long) server->fsid.minor); 1024 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 1025 1026 error = nfs_probe_fsinfo(server, mntfh, fattr); 1027 if (error < 0) 1028 goto out; 1029 1030 nfs4_session_limit_rwsize(server); 1031 1032 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1033 server->namelen = NFS4_MAXNAMLEN; 1034 1035 nfs_server_insert_lists(server); 1036 server->mount_time = jiffies; 1037 server->destroy = nfs4_destroy_server; 1038 out: 1039 nfs_free_fattr(fattr); 1040 return error; 1041 } 1042 1043 /* 1044 * Create a version 4 volume record 1045 */ 1046 static int nfs4_init_server(struct nfs_server *server, 1047 struct nfs_parsed_mount_data *data) 1048 { 1049 struct rpc_timeout timeparms; 1050 int error; 1051 1052 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1053 data->timeo, data->retrans); 1054 1055 /* Initialise the client representation from the mount data */ 1056 server->flags = data->flags; 1057 server->options = data->options; 1058 server->auth_info = data->auth_info; 1059 1060 /* Use the first specified auth flavor. If this flavor isn't 1061 * allowed by the server, use the SECINFO path to try the 1062 * other specified flavors */ 1063 if (data->auth_info.flavor_len >= 1) 1064 data->selected_flavor = data->auth_info.flavors[0]; 1065 else 1066 data->selected_flavor = RPC_AUTH_UNIX; 1067 1068 /* Get a client record */ 1069 error = nfs4_set_client(server, 1070 data->nfs_server.hostname, 1071 (const struct sockaddr *)&data->nfs_server.address, 1072 data->nfs_server.addrlen, 1073 data->client_address, 1074 data->nfs_server.protocol, 1075 &timeparms, 1076 data->minorversion, 1077 data->net); 1078 if (error < 0) 1079 return error; 1080 1081 if (data->rsize) 1082 server->rsize = nfs_block_size(data->rsize, NULL); 1083 if (data->wsize) 1084 server->wsize = nfs_block_size(data->wsize, NULL); 1085 1086 server->acregmin = data->acregmin * HZ; 1087 server->acregmax = data->acregmax * HZ; 1088 server->acdirmin = data->acdirmin * HZ; 1089 server->acdirmax = data->acdirmax * HZ; 1090 server->port = data->nfs_server.port; 1091 1092 return nfs_init_server_rpcclient(server, &timeparms, 1093 data->selected_flavor); 1094 } 1095 1096 /* 1097 * Create a version 4 volume record 1098 * - keyed on server and FSID 1099 */ 1100 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1101 struct nfs_fh *mntfh)*/ 1102 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 1103 struct nfs_subversion *nfs_mod) 1104 { 1105 struct nfs_server *server; 1106 bool auth_probe; 1107 int error; 1108 1109 server = nfs_alloc_server(); 1110 if (!server) 1111 return ERR_PTR(-ENOMEM); 1112 1113 server->cred = get_cred(current_cred()); 1114 1115 auth_probe = mount_info->parsed->auth_info.flavor_len < 1; 1116 1117 /* set up the general RPC client */ 1118 error = nfs4_init_server(server, mount_info->parsed); 1119 if (error < 0) 1120 goto error; 1121 1122 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe); 1123 if (error < 0) 1124 goto error; 1125 1126 return server; 1127 1128 error: 1129 nfs_free_server(server); 1130 return ERR_PTR(error); 1131 } 1132 1133 /* 1134 * Create an NFS4 referral server record 1135 */ 1136 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1137 struct nfs_fh *mntfh) 1138 { 1139 struct nfs_client *parent_client; 1140 struct nfs_server *server, *parent_server; 1141 bool auth_probe; 1142 int error; 1143 1144 server = nfs_alloc_server(); 1145 if (!server) 1146 return ERR_PTR(-ENOMEM); 1147 1148 parent_server = NFS_SB(data->sb); 1149 parent_client = parent_server->nfs_client; 1150 1151 server->cred = get_cred(parent_server->cred); 1152 1153 /* Initialise the client representation from the parent server */ 1154 nfs_server_copy_userdata(server, parent_server); 1155 1156 /* Get a client representation */ 1157 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1158 rpc_set_port(data->addr, NFS_RDMA_PORT); 1159 error = nfs4_set_client(server, data->hostname, 1160 data->addr, 1161 data->addrlen, 1162 parent_client->cl_ipaddr, 1163 XPRT_TRANSPORT_RDMA, 1164 parent_server->client->cl_timeout, 1165 parent_client->cl_mvops->minor_version, 1166 parent_client->cl_net); 1167 if (!error) 1168 goto init_server; 1169 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */ 1170 1171 rpc_set_port(data->addr, NFS_PORT); 1172 error = nfs4_set_client(server, data->hostname, 1173 data->addr, 1174 data->addrlen, 1175 parent_client->cl_ipaddr, 1176 XPRT_TRANSPORT_TCP, 1177 parent_server->client->cl_timeout, 1178 parent_client->cl_mvops->minor_version, 1179 parent_client->cl_net); 1180 if (error < 0) 1181 goto error; 1182 1183 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1184 init_server: 1185 #endif 1186 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1187 if (error < 0) 1188 goto error; 1189 1190 auth_probe = parent_server->auth_info.flavor_len < 1; 1191 1192 error = nfs4_server_common_setup(server, mntfh, auth_probe); 1193 if (error < 0) 1194 goto error; 1195 1196 return server; 1197 1198 error: 1199 nfs_free_server(server); 1200 return ERR_PTR(error); 1201 } 1202 1203 /* 1204 * Grab the destination's particulars, including lease expiry time. 1205 * 1206 * Returns zero if probe succeeded and retrieved FSID matches the FSID 1207 * we have cached. 1208 */ 1209 static int nfs_probe_destination(struct nfs_server *server) 1210 { 1211 struct inode *inode = d_inode(server->super->s_root); 1212 struct nfs_fattr *fattr; 1213 int error; 1214 1215 fattr = nfs_alloc_fattr(); 1216 if (fattr == NULL) 1217 return -ENOMEM; 1218 1219 /* Sanity: the probe won't work if the destination server 1220 * does not recognize the migrated FH. */ 1221 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr); 1222 1223 nfs_free_fattr(fattr); 1224 return error; 1225 } 1226 1227 /** 1228 * nfs4_update_server - Move an nfs_server to a different nfs_client 1229 * 1230 * @server: represents FSID to be moved 1231 * @hostname: new end-point's hostname 1232 * @sap: new end-point's socket address 1233 * @salen: size of "sap" 1234 * @net: net namespace 1235 * 1236 * The nfs_server must be quiescent before this function is invoked. 1237 * Either its session is drained (NFSv4.1+), or its transport is 1238 * plugged and drained (NFSv4.0). 1239 * 1240 * Returns zero on success, or a negative errno value. 1241 */ 1242 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1243 struct sockaddr *sap, size_t salen, struct net *net) 1244 { 1245 struct nfs_client *clp = server->nfs_client; 1246 struct rpc_clnt *clnt = server->client; 1247 struct xprt_create xargs = { 1248 .ident = clp->cl_proto, 1249 .net = net, 1250 .dstaddr = sap, 1251 .addrlen = salen, 1252 .servername = hostname, 1253 }; 1254 char buf[INET6_ADDRSTRLEN + 1]; 1255 struct sockaddr_storage address; 1256 struct sockaddr *localaddr = (struct sockaddr *)&address; 1257 int error; 1258 1259 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1260 if (error != 0) 1261 return error; 1262 1263 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1264 if (error != 0) 1265 return error; 1266 1267 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1268 return -EAFNOSUPPORT; 1269 1270 nfs_server_remove_lists(server); 1271 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1272 error = nfs4_set_client(server, hostname, sap, salen, buf, 1273 clp->cl_proto, clnt->cl_timeout, 1274 clp->cl_minorversion, net); 1275 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1276 if (error != 0) { 1277 nfs_server_insert_lists(server); 1278 return error; 1279 } 1280 nfs_put_client(clp); 1281 1282 if (server->nfs_client->cl_hostname == NULL) 1283 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1284 nfs_server_insert_lists(server); 1285 1286 return nfs_probe_destination(server); 1287 } 1288