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