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 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 365 return clp; 366 } 367 368 /* Check NFS protocol revision and initialize RPC op vector */ 369 clp->rpc_ops = &nfs_v4_clientops; 370 371 if (clp->cl_minorversion != 0) 372 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 373 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 374 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 375 376 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 377 if (error == -EINVAL) 378 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 379 if (error < 0) 380 goto error; 381 382 /* If no clientaddr= option was specified, find a usable cb address */ 383 if (ip_addr == NULL) { 384 struct sockaddr_storage cb_addr; 385 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 386 387 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 388 if (error < 0) 389 goto error; 390 error = rpc_ntop(sap, buf, sizeof(buf)); 391 if (error < 0) 392 goto error; 393 ip_addr = (const char *)buf; 394 } 395 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 396 397 error = nfs_idmap_new(clp); 398 if (error < 0) { 399 dprintk("%s: failed to create idmapper. Error = %d\n", 400 __func__, error); 401 goto error; 402 } 403 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 404 405 error = nfs4_init_client_minor_version(clp); 406 if (error < 0) 407 goto error; 408 409 if (!nfs4_has_session(clp)) 410 nfs_mark_client_ready(clp, NFS_CS_READY); 411 412 error = nfs4_discover_server_trunking(clp, &old); 413 if (error < 0) 414 goto error; 415 416 if (clp != old) 417 clp->cl_preserve_clid = true; 418 nfs_put_client(clp); 419 return old; 420 421 error: 422 nfs_mark_client_ready(clp, error); 423 nfs_put_client(clp); 424 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 425 return ERR_PTR(error); 426 } 427 428 /* 429 * SETCLIENTID just did a callback update with the callback ident in 430 * "drop," but server trunking discovery claims "drop" and "keep" are 431 * actually the same server. Swap the callback IDs so that "keep" 432 * will continue to use the callback ident the server now knows about, 433 * and so that "keep"'s original callback ident is destroyed when 434 * "drop" is freed. 435 */ 436 static void nfs4_swap_callback_idents(struct nfs_client *keep, 437 struct nfs_client *drop) 438 { 439 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 440 unsigned int save = keep->cl_cb_ident; 441 442 if (keep->cl_cb_ident == drop->cl_cb_ident) 443 return; 444 445 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 446 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 447 448 spin_lock(&nn->nfs_client_lock); 449 450 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 451 keep->cl_cb_ident = drop->cl_cb_ident; 452 453 idr_replace(&nn->cb_ident_idr, drop, save); 454 drop->cl_cb_ident = save; 455 456 spin_unlock(&nn->nfs_client_lock); 457 } 458 459 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 460 const struct nfs_client *clp2) 461 { 462 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 463 return true; 464 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 465 } 466 467 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2) 468 { 469 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0; 470 } 471 472 /** 473 * nfs40_walk_client_list - Find server that recognizes a client ID 474 * 475 * @new: nfs_client with client ID to test 476 * @result: OUT: found nfs_client, or new 477 * @cred: credential to use for trunking test 478 * 479 * Returns zero, a negative errno, or a negative NFS4ERR status. 480 * If zero is returned, an nfs_client pointer is planted in "result." 481 * 482 * NB: nfs40_walk_client_list() relies on the new nfs_client being 483 * the last nfs_client on the list. 484 */ 485 int nfs40_walk_client_list(struct nfs_client *new, 486 struct nfs_client **result, 487 struct rpc_cred *cred) 488 { 489 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 490 struct nfs_client *pos, *prev = NULL; 491 struct nfs4_setclientid_res clid = { 492 .clientid = new->cl_clientid, 493 .confirm = new->cl_confirm, 494 }; 495 int status = -NFS4ERR_STALE_CLIENTID; 496 497 spin_lock(&nn->nfs_client_lock); 498 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 499 500 if (pos->rpc_ops != new->rpc_ops) 501 continue; 502 503 if (pos->cl_minorversion != new->cl_minorversion) 504 continue; 505 506 /* If "pos" isn't marked ready, we can't trust the 507 * remaining fields in "pos" */ 508 if (pos->cl_cons_state > NFS_CS_READY) { 509 atomic_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 if (status < 0) 517 goto out; 518 status = -NFS4ERR_STALE_CLIENTID; 519 spin_lock(&nn->nfs_client_lock); 520 } 521 if (pos->cl_cons_state != NFS_CS_READY) 522 continue; 523 524 if (pos->cl_clientid != new->cl_clientid) 525 continue; 526 527 if (!nfs4_match_client_owner_id(pos, new)) 528 continue; 529 /* 530 * We just sent a new SETCLIENTID, which should have 531 * caused the server to return a new cl_confirm. So if 532 * cl_confirm is the same, then this is a different 533 * server that just returned the same cl_confirm by 534 * coincidence: 535 */ 536 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm, 537 &new->cl_confirm)) 538 continue; 539 /* 540 * But if the cl_confirm's are different, then the only 541 * way that a SETCLIENTID_CONFIRM to pos can succeed is 542 * if new and pos point to the same server: 543 */ 544 atomic_inc(&pos->cl_count); 545 spin_unlock(&nn->nfs_client_lock); 546 547 nfs_put_client(prev); 548 prev = pos; 549 550 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 551 switch (status) { 552 case -NFS4ERR_STALE_CLIENTID: 553 break; 554 case 0: 555 nfs4_swap_callback_idents(pos, new); 556 pos->cl_confirm = new->cl_confirm; 557 558 prev = NULL; 559 *result = pos; 560 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 561 __func__, pos, atomic_read(&pos->cl_count)); 562 goto out; 563 case -ERESTARTSYS: 564 case -ETIMEDOUT: 565 /* The callback path may have been inadvertently 566 * changed. Schedule recovery! 567 */ 568 nfs4_schedule_path_down_recovery(pos); 569 default: 570 goto out; 571 } 572 573 spin_lock(&nn->nfs_client_lock); 574 } 575 spin_unlock(&nn->nfs_client_lock); 576 577 /* No match found. The server lost our clientid */ 578 out: 579 nfs_put_client(prev); 580 dprintk("NFS: <-- %s status = %d\n", __func__, status); 581 return status; 582 } 583 584 #ifdef CONFIG_NFS_V4_1 585 /* 586 * Returns true if the client IDs match 587 */ 588 static bool nfs4_match_clientids(u64 a, u64 b) 589 { 590 if (a != b) { 591 dprintk("NFS: --> %s client ID %llx does not match %llx\n", 592 __func__, a, b); 593 return false; 594 } 595 dprintk("NFS: --> %s client ID %llx matches %llx\n", 596 __func__, a, b); 597 return true; 598 } 599 600 /* 601 * Returns true if the server major ids match 602 */ 603 static bool 604 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 605 struct nfs41_server_owner *o2) 606 { 607 if (o1->major_id_sz != o2->major_id_sz) 608 goto out_major_mismatch; 609 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0) 610 goto out_major_mismatch; 611 612 dprintk("NFS: --> %s server owner major IDs match\n", __func__); 613 return true; 614 615 out_major_mismatch: 616 dprintk("NFS: --> %s server owner major IDs do not match\n", 617 __func__); 618 return false; 619 } 620 621 /* 622 * Returns true if server minor ids match 623 */ 624 static bool 625 nfs4_check_serverowner_minor_id(struct nfs41_server_owner *o1, 626 struct nfs41_server_owner *o2) 627 { 628 /* Check eir_server_owner so_minor_id */ 629 if (o1->minor_id != o2->minor_id) 630 goto out_minor_mismatch; 631 632 dprintk("NFS: --> %s server owner minor IDs match\n", __func__); 633 return true; 634 635 out_minor_mismatch: 636 dprintk("NFS: --> %s server owner minor IDs do not match\n", __func__); 637 return false; 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 goto out_scope_mismatch; 649 if (memcmp(s1->server_scope, s2->server_scope, 650 s1->server_scope_sz) != 0) 651 goto out_scope_mismatch; 652 653 dprintk("NFS: --> %s server scopes match\n", __func__); 654 return true; 655 656 out_scope_mismatch: 657 dprintk("NFS: --> %s server scopes do not match\n", 658 __func__); 659 return false; 660 } 661 662 /** 663 * nfs4_detect_session_trunking - Checks for session trunking. 664 * 665 * Called after a successful EXCHANGE_ID on a multi-addr connection. 666 * Upon success, add the transport. 667 * 668 * @clp: original mount nfs_client 669 * @res: result structure from an exchange_id using the original mount 670 * nfs_client with a new multi_addr transport 671 * 672 * Returns zero on success, otherwise -EINVAL 673 * 674 * Note: since the exchange_id for the new multi_addr transport uses the 675 * same nfs_client from the original mount, the cl_owner_id is reused, 676 * so eir_clientowner is the same. 677 */ 678 int nfs4_detect_session_trunking(struct nfs_client *clp, 679 struct nfs41_exchange_id_res *res, 680 struct rpc_xprt *xprt) 681 { 682 /* Check eir_clientid */ 683 if (!nfs4_match_clientids(clp->cl_clientid, res->clientid)) 684 goto out_err; 685 686 /* Check eir_server_owner so_major_id */ 687 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 688 res->server_owner)) 689 goto out_err; 690 691 /* Check eir_server_owner so_minor_id */ 692 if (!nfs4_check_serverowner_minor_id(clp->cl_serverowner, 693 res->server_owner)) 694 goto out_err; 695 696 /* Check eir_server_scope */ 697 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 698 goto out_err; 699 700 /* Session trunking passed, add the xprt */ 701 rpc_clnt_xprt_switch_add_xprt(clp->cl_rpcclient, xprt); 702 703 pr_info("NFS: %s: Session trunking succeeded for %s\n", 704 clp->cl_hostname, 705 xprt->address_strings[RPC_DISPLAY_ADDR]); 706 707 return 0; 708 out_err: 709 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 710 xprt->address_strings[RPC_DISPLAY_ADDR]); 711 712 return -EINVAL; 713 } 714 715 /** 716 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 717 * 718 * @new: nfs_client with client ID to test 719 * @result: OUT: found nfs_client, or new 720 * @cred: credential to use for trunking test 721 * 722 * Returns zero, a negative errno, or a negative NFS4ERR status. 723 * If zero is returned, an nfs_client pointer is planted in "result." 724 * 725 * NB: nfs41_walk_client_list() relies on the new nfs_client being 726 * the last nfs_client on the list. 727 */ 728 int nfs41_walk_client_list(struct nfs_client *new, 729 struct nfs_client **result, 730 struct rpc_cred *cred) 731 { 732 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 733 struct nfs_client *pos, *prev = NULL; 734 int status = -NFS4ERR_STALE_CLIENTID; 735 736 spin_lock(&nn->nfs_client_lock); 737 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 738 739 if (pos == new) 740 goto found; 741 742 if (pos->rpc_ops != new->rpc_ops) 743 continue; 744 745 if (pos->cl_minorversion != new->cl_minorversion) 746 continue; 747 748 /* If "pos" isn't marked ready, we can't trust the 749 * remaining fields in "pos", especially the client 750 * ID and serverowner fields. Wait for CREATE_SESSION 751 * to finish. */ 752 if (pos->cl_cons_state > NFS_CS_READY) { 753 atomic_inc(&pos->cl_count); 754 spin_unlock(&nn->nfs_client_lock); 755 756 nfs_put_client(prev); 757 prev = pos; 758 759 status = nfs_wait_client_init_complete(pos); 760 spin_lock(&nn->nfs_client_lock); 761 if (status < 0) 762 break; 763 status = -NFS4ERR_STALE_CLIENTID; 764 } 765 if (pos->cl_cons_state != NFS_CS_READY) 766 continue; 767 768 if (!nfs4_match_clientids(pos->cl_clientid, new->cl_clientid)) 769 continue; 770 771 /* 772 * Note that session trunking is just a special subcase of 773 * client id trunking. In either case, we want to fall back 774 * to using the existing nfs_client. 775 */ 776 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 777 new->cl_serverowner)) 778 continue; 779 780 /* Unlike NFSv4.0, we know that NFSv4.1 always uses the 781 * uniform string, however someone might switch the 782 * uniquifier string on us. 783 */ 784 if (!nfs4_match_client_owner_id(pos, new)) 785 continue; 786 found: 787 atomic_inc(&pos->cl_count); 788 *result = pos; 789 status = 0; 790 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 791 __func__, pos, atomic_read(&pos->cl_count)); 792 break; 793 } 794 795 spin_unlock(&nn->nfs_client_lock); 796 dprintk("NFS: <-- %s status = %d\n", __func__, status); 797 nfs_put_client(prev); 798 return status; 799 } 800 #endif /* CONFIG_NFS_V4_1 */ 801 802 static void nfs4_destroy_server(struct nfs_server *server) 803 { 804 nfs_server_return_all_delegations(server); 805 unset_pnfs_layoutdriver(server); 806 nfs4_purge_state_owners(server); 807 } 808 809 /* 810 * NFSv4.0 callback thread helper 811 * 812 * Find a client by callback identifier 813 */ 814 struct nfs_client * 815 nfs4_find_client_ident(struct net *net, int cb_ident) 816 { 817 struct nfs_client *clp; 818 struct nfs_net *nn = net_generic(net, nfs_net_id); 819 820 spin_lock(&nn->nfs_client_lock); 821 clp = idr_find(&nn->cb_ident_idr, cb_ident); 822 if (clp) 823 atomic_inc(&clp->cl_count); 824 spin_unlock(&nn->nfs_client_lock); 825 return clp; 826 } 827 828 #if defined(CONFIG_NFS_V4_1) 829 /* Common match routine for v4.0 and v4.1 callback services */ 830 static bool nfs4_cb_match_client(const struct sockaddr *addr, 831 struct nfs_client *clp, u32 minorversion) 832 { 833 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 834 835 /* Don't match clients that failed to initialise */ 836 if (!(clp->cl_cons_state == NFS_CS_READY || 837 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 838 return false; 839 840 smp_rmb(); 841 842 /* Match the version and minorversion */ 843 if (clp->rpc_ops->version != 4 || 844 clp->cl_minorversion != minorversion) 845 return false; 846 847 /* Match only the IP address, not the port number */ 848 return rpc_cmp_addr(addr, clap); 849 } 850 851 /* 852 * NFSv4.1 callback thread helper 853 * For CB_COMPOUND calls, find a client by IP address, protocol version, 854 * minorversion, and sessionID 855 * 856 * Returns NULL if no such client 857 */ 858 struct nfs_client * 859 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 860 struct nfs4_sessionid *sid, u32 minorversion) 861 { 862 struct nfs_client *clp; 863 struct nfs_net *nn = net_generic(net, nfs_net_id); 864 865 spin_lock(&nn->nfs_client_lock); 866 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 867 if (nfs4_cb_match_client(addr, clp, minorversion) == false) 868 continue; 869 870 if (!nfs4_has_session(clp)) 871 continue; 872 873 /* Match sessionid*/ 874 if (memcmp(clp->cl_session->sess_id.data, 875 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 876 continue; 877 878 atomic_inc(&clp->cl_count); 879 spin_unlock(&nn->nfs_client_lock); 880 return clp; 881 } 882 spin_unlock(&nn->nfs_client_lock); 883 return NULL; 884 } 885 886 #else /* CONFIG_NFS_V4_1 */ 887 888 struct nfs_client * 889 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 890 struct nfs4_sessionid *sid, u32 minorversion) 891 { 892 return NULL; 893 } 894 #endif /* CONFIG_NFS_V4_1 */ 895 896 /* 897 * Set up an NFS4 client 898 */ 899 static int nfs4_set_client(struct nfs_server *server, 900 const char *hostname, 901 const struct sockaddr *addr, 902 const size_t addrlen, 903 const char *ip_addr, 904 int proto, const struct rpc_timeout *timeparms, 905 u32 minorversion, struct net *net) 906 { 907 struct nfs_client_initdata cl_init = { 908 .hostname = hostname, 909 .addr = addr, 910 .addrlen = addrlen, 911 .ip_addr = ip_addr, 912 .nfs_mod = &nfs_v4, 913 .proto = proto, 914 .minorversion = minorversion, 915 .net = net, 916 .timeparms = timeparms, 917 }; 918 struct nfs_client *clp; 919 int error; 920 921 dprintk("--> nfs4_set_client()\n"); 922 923 if (server->flags & NFS_MOUNT_NORESVPORT) 924 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 925 if (server->options & NFS_OPTION_MIGRATION) 926 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 927 928 /* Allocate or find a client reference we can use */ 929 clp = nfs_get_client(&cl_init); 930 if (IS_ERR(clp)) { 931 error = PTR_ERR(clp); 932 goto error; 933 } 934 935 if (server->nfs_client == clp) { 936 error = -ELOOP; 937 goto error; 938 } 939 940 /* 941 * Query for the lease time on clientid setup or renewal 942 * 943 * Note that this will be set on nfs_clients that were created 944 * only for the DS role and did not set this bit, but now will 945 * serve a dual role. 946 */ 947 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 948 949 server->nfs_client = clp; 950 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 951 return 0; 952 error: 953 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 954 return error; 955 } 956 957 /* 958 * Set up a pNFS Data Server client. 959 * 960 * Return any existing nfs_client that matches server address,port,version 961 * and minorversion. 962 * 963 * For a new nfs_client, use a soft mount (default), a low retrans and a 964 * low timeout interval so that if a connection is lost, we retry through 965 * the MDS. 966 */ 967 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 968 const struct sockaddr *ds_addr, int ds_addrlen, 969 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 970 u32 minor_version) 971 { 972 struct rpc_timeout ds_timeout; 973 struct nfs_client *mds_clp = mds_srv->nfs_client; 974 struct nfs_client_initdata cl_init = { 975 .addr = ds_addr, 976 .addrlen = ds_addrlen, 977 .nodename = mds_clp->cl_rpcclient->cl_nodename, 978 .ip_addr = mds_clp->cl_ipaddr, 979 .nfs_mod = &nfs_v4, 980 .proto = ds_proto, 981 .minorversion = minor_version, 982 .net = mds_clp->cl_net, 983 .timeparms = &ds_timeout, 984 }; 985 struct nfs_client *clp; 986 char buf[INET6_ADDRSTRLEN + 1]; 987 988 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0) 989 return ERR_PTR(-EINVAL); 990 cl_init.hostname = buf; 991 992 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 993 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 994 995 /* 996 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 997 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 998 * (section 13.1 RFC 5661). 999 */ 1000 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 1001 clp = nfs_get_client(&cl_init); 1002 1003 dprintk("<-- %s %p\n", __func__, clp); 1004 return clp; 1005 } 1006 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 1007 1008 /* 1009 * Session has been established, and the client marked ready. 1010 * Set the mount rsize and wsize with negotiated fore channel 1011 * attributes which will be bound checked in nfs_server_set_fsinfo. 1012 */ 1013 static void nfs4_session_set_rwsize(struct nfs_server *server) 1014 { 1015 #ifdef CONFIG_NFS_V4_1 1016 struct nfs4_session *sess; 1017 u32 server_resp_sz; 1018 u32 server_rqst_sz; 1019 1020 if (!nfs4_has_session(server->nfs_client)) 1021 return; 1022 sess = server->nfs_client->cl_session; 1023 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 1024 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 1025 1026 if (!server->rsize || server->rsize > server_resp_sz) 1027 server->rsize = server_resp_sz; 1028 if (!server->wsize || server->wsize > server_rqst_sz) 1029 server->wsize = server_rqst_sz; 1030 #endif /* CONFIG_NFS_V4_1 */ 1031 } 1032 1033 static int nfs4_server_common_setup(struct nfs_server *server, 1034 struct nfs_fh *mntfh, bool auth_probe) 1035 { 1036 struct nfs_fattr *fattr; 1037 int error; 1038 1039 /* data servers support only a subset of NFSv4.1 */ 1040 if (is_ds_only_client(server->nfs_client)) 1041 return -EPROTONOSUPPORT; 1042 1043 fattr = nfs_alloc_fattr(); 1044 if (fattr == NULL) 1045 return -ENOMEM; 1046 1047 /* We must ensure the session is initialised first */ 1048 error = nfs4_init_session(server->nfs_client); 1049 if (error < 0) 1050 goto out; 1051 1052 /* Set the basic capabilities */ 1053 server->caps |= server->nfs_client->cl_mvops->init_caps; 1054 if (server->flags & NFS_MOUNT_NORDIRPLUS) 1055 server->caps &= ~NFS_CAP_READDIRPLUS; 1056 /* 1057 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 1058 * authentication. 1059 */ 1060 if (nfs4_disable_idmapping && 1061 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 1062 server->caps |= NFS_CAP_UIDGID_NOMAP; 1063 1064 1065 /* Probe the root fh to retrieve its FSID and filehandle */ 1066 error = nfs4_get_rootfh(server, mntfh, auth_probe); 1067 if (error < 0) 1068 goto out; 1069 1070 dprintk("Server FSID: %llx:%llx\n", 1071 (unsigned long long) server->fsid.major, 1072 (unsigned long long) server->fsid.minor); 1073 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 1074 1075 nfs4_session_set_rwsize(server); 1076 1077 error = nfs_probe_fsinfo(server, mntfh, fattr); 1078 if (error < 0) 1079 goto out; 1080 1081 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 1082 server->namelen = NFS4_MAXNAMLEN; 1083 1084 nfs_server_insert_lists(server); 1085 server->mount_time = jiffies; 1086 server->destroy = nfs4_destroy_server; 1087 out: 1088 nfs_free_fattr(fattr); 1089 return error; 1090 } 1091 1092 /* 1093 * Create a version 4 volume record 1094 */ 1095 static int nfs4_init_server(struct nfs_server *server, 1096 struct nfs_parsed_mount_data *data) 1097 { 1098 struct rpc_timeout timeparms; 1099 int error; 1100 1101 dprintk("--> nfs4_init_server()\n"); 1102 1103 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 1104 data->timeo, data->retrans); 1105 1106 /* Initialise the client representation from the mount data */ 1107 server->flags = data->flags; 1108 server->options = data->options; 1109 server->auth_info = data->auth_info; 1110 1111 /* Use the first specified auth flavor. If this flavor isn't 1112 * allowed by the server, use the SECINFO path to try the 1113 * other specified flavors */ 1114 if (data->auth_info.flavor_len >= 1) 1115 data->selected_flavor = data->auth_info.flavors[0]; 1116 else 1117 data->selected_flavor = RPC_AUTH_UNIX; 1118 1119 /* Get a client record */ 1120 error = nfs4_set_client(server, 1121 data->nfs_server.hostname, 1122 (const struct sockaddr *)&data->nfs_server.address, 1123 data->nfs_server.addrlen, 1124 data->client_address, 1125 data->nfs_server.protocol, 1126 &timeparms, 1127 data->minorversion, 1128 data->net); 1129 if (error < 0) 1130 goto error; 1131 1132 if (data->rsize) 1133 server->rsize = nfs_block_size(data->rsize, NULL); 1134 if (data->wsize) 1135 server->wsize = nfs_block_size(data->wsize, NULL); 1136 1137 server->acregmin = data->acregmin * HZ; 1138 server->acregmax = data->acregmax * HZ; 1139 server->acdirmin = data->acdirmin * HZ; 1140 server->acdirmax = data->acdirmax * HZ; 1141 1142 server->port = data->nfs_server.port; 1143 1144 error = nfs_init_server_rpcclient(server, &timeparms, 1145 data->selected_flavor); 1146 1147 error: 1148 /* Done */ 1149 dprintk("<-- nfs4_init_server() = %d\n", error); 1150 return error; 1151 } 1152 1153 /* 1154 * Create a version 4 volume record 1155 * - keyed on server and FSID 1156 */ 1157 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1158 struct nfs_fh *mntfh)*/ 1159 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 1160 struct nfs_subversion *nfs_mod) 1161 { 1162 struct nfs_server *server; 1163 bool auth_probe; 1164 int error; 1165 1166 dprintk("--> nfs4_create_server()\n"); 1167 1168 server = nfs_alloc_server(); 1169 if (!server) 1170 return ERR_PTR(-ENOMEM); 1171 1172 auth_probe = mount_info->parsed->auth_info.flavor_len < 1; 1173 1174 /* set up the general RPC client */ 1175 error = nfs4_init_server(server, mount_info->parsed); 1176 if (error < 0) 1177 goto error; 1178 1179 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe); 1180 if (error < 0) 1181 goto error; 1182 1183 dprintk("<-- nfs4_create_server() = %p\n", server); 1184 return server; 1185 1186 error: 1187 nfs_free_server(server); 1188 dprintk("<-- nfs4_create_server() = error %d\n", error); 1189 return ERR_PTR(error); 1190 } 1191 1192 /* 1193 * Create an NFS4 referral server record 1194 */ 1195 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1196 struct nfs_fh *mntfh) 1197 { 1198 struct nfs_client *parent_client; 1199 struct nfs_server *server, *parent_server; 1200 bool auth_probe; 1201 int error; 1202 1203 dprintk("--> nfs4_create_referral_server()\n"); 1204 1205 server = nfs_alloc_server(); 1206 if (!server) 1207 return ERR_PTR(-ENOMEM); 1208 1209 parent_server = NFS_SB(data->sb); 1210 parent_client = parent_server->nfs_client; 1211 1212 /* Initialise the client representation from the parent server */ 1213 nfs_server_copy_userdata(server, parent_server); 1214 1215 /* Get a client representation. 1216 * Note: NFSv4 always uses TCP, */ 1217 error = nfs4_set_client(server, data->hostname, 1218 data->addr, 1219 data->addrlen, 1220 parent_client->cl_ipaddr, 1221 rpc_protocol(parent_server->client), 1222 parent_server->client->cl_timeout, 1223 parent_client->cl_mvops->minor_version, 1224 parent_client->cl_net); 1225 if (error < 0) 1226 goto error; 1227 1228 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1229 if (error < 0) 1230 goto error; 1231 1232 auth_probe = parent_server->auth_info.flavor_len < 1; 1233 1234 error = nfs4_server_common_setup(server, mntfh, auth_probe); 1235 if (error < 0) 1236 goto error; 1237 1238 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1239 return server; 1240 1241 error: 1242 nfs_free_server(server); 1243 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1244 return ERR_PTR(error); 1245 } 1246 1247 /* 1248 * Grab the destination's particulars, including lease expiry time. 1249 * 1250 * Returns zero if probe succeeded and retrieved FSID matches the FSID 1251 * we have cached. 1252 */ 1253 static int nfs_probe_destination(struct nfs_server *server) 1254 { 1255 struct inode *inode = d_inode(server->super->s_root); 1256 struct nfs_fattr *fattr; 1257 int error; 1258 1259 fattr = nfs_alloc_fattr(); 1260 if (fattr == NULL) 1261 return -ENOMEM; 1262 1263 /* Sanity: the probe won't work if the destination server 1264 * does not recognize the migrated FH. */ 1265 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr); 1266 1267 nfs_free_fattr(fattr); 1268 return error; 1269 } 1270 1271 /** 1272 * nfs4_update_server - Move an nfs_server to a different nfs_client 1273 * 1274 * @server: represents FSID to be moved 1275 * @hostname: new end-point's hostname 1276 * @sap: new end-point's socket address 1277 * @salen: size of "sap" 1278 * @net: net namespace 1279 * 1280 * The nfs_server must be quiescent before this function is invoked. 1281 * Either its session is drained (NFSv4.1+), or its transport is 1282 * plugged and drained (NFSv4.0). 1283 * 1284 * Returns zero on success, or a negative errno value. 1285 */ 1286 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1287 struct sockaddr *sap, size_t salen, struct net *net) 1288 { 1289 struct nfs_client *clp = server->nfs_client; 1290 struct rpc_clnt *clnt = server->client; 1291 struct xprt_create xargs = { 1292 .ident = clp->cl_proto, 1293 .net = net, 1294 .dstaddr = sap, 1295 .addrlen = salen, 1296 .servername = hostname, 1297 }; 1298 char buf[INET6_ADDRSTRLEN + 1]; 1299 struct sockaddr_storage address; 1300 struct sockaddr *localaddr = (struct sockaddr *)&address; 1301 int error; 1302 1303 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__, 1304 (unsigned long long)server->fsid.major, 1305 (unsigned long long)server->fsid.minor, 1306 hostname); 1307 1308 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1309 if (error != 0) { 1310 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n", 1311 __func__, error); 1312 goto out; 1313 } 1314 1315 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1316 if (error != 0) { 1317 dprintk("<-- %s(): rpc_localaddr returned %d\n", 1318 __func__, error); 1319 goto out; 1320 } 1321 1322 error = -EAFNOSUPPORT; 1323 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) { 1324 dprintk("<-- %s(): rpc_ntop returned %d\n", 1325 __func__, error); 1326 goto out; 1327 } 1328 1329 nfs_server_remove_lists(server); 1330 error = nfs4_set_client(server, hostname, sap, salen, buf, 1331 clp->cl_proto, clnt->cl_timeout, 1332 clp->cl_minorversion, net); 1333 nfs_put_client(clp); 1334 if (error != 0) { 1335 nfs_server_insert_lists(server); 1336 dprintk("<-- %s(): nfs4_set_client returned %d\n", 1337 __func__, error); 1338 goto out; 1339 } 1340 1341 if (server->nfs_client->cl_hostname == NULL) 1342 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1343 nfs_server_insert_lists(server); 1344 1345 error = nfs_probe_destination(server); 1346 if (error < 0) 1347 goto out; 1348 1349 dprintk("<-- %s() succeeded\n", __func__); 1350 1351 out: 1352 return error; 1353 } 1354