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