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_idmap.h> 8 #include <linux/nfs_mount.h> 9 #include <linux/sunrpc/addr.h> 10 #include <linux/sunrpc/auth.h> 11 #include <linux/sunrpc/xprt.h> 12 #include <linux/sunrpc/bc_xprt.h> 13 #include <linux/sunrpc/rpc_pipe_fs.h> 14 #include "internal.h" 15 #include "callback.h" 16 #include "delegation.h" 17 #include "nfs4session.h" 18 #include "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, 0, 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 return clp; 203 204 error: 205 nfs_free_client(clp); 206 return ERR_PTR(err); 207 } 208 209 /* 210 * Destroy the NFS4 callback service 211 */ 212 static void nfs4_destroy_callback(struct nfs_client *clp) 213 { 214 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) 215 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net); 216 } 217 218 static void nfs4_shutdown_client(struct nfs_client *clp) 219 { 220 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 221 nfs4_kill_renewd(clp); 222 clp->cl_mvops->shutdown_client(clp); 223 nfs4_destroy_callback(clp); 224 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 225 nfs_idmap_delete(clp); 226 227 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 228 kfree(clp->cl_serverowner); 229 kfree(clp->cl_serverscope); 230 kfree(clp->cl_implid); 231 } 232 233 void nfs4_free_client(struct nfs_client *clp) 234 { 235 nfs4_shutdown_client(clp); 236 nfs_free_client(clp); 237 } 238 239 /* 240 * Initialize the NFS4 callback service 241 */ 242 static int nfs4_init_callback(struct nfs_client *clp) 243 { 244 struct rpc_xprt *xprt; 245 int error; 246 247 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 248 249 if (nfs4_has_session(clp)) { 250 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 251 if (error < 0) 252 return error; 253 } 254 255 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 256 if (error < 0) { 257 dprintk("%s: failed to start callback. Error = %d\n", 258 __func__, error); 259 return error; 260 } 261 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 262 263 return 0; 264 } 265 266 /** 267 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0 268 * @clp - nfs_client to initialize 269 * 270 * Returns zero on success, or a negative errno if some error occurred. 271 */ 272 int nfs40_init_client(struct nfs_client *clp) 273 { 274 struct nfs4_slot_table *tbl; 275 int ret; 276 277 tbl = kzalloc(sizeof(*tbl), GFP_NOFS); 278 if (tbl == NULL) 279 return -ENOMEM; 280 281 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE, 282 "NFSv4.0 transport Slot table"); 283 if (ret) { 284 kfree(tbl); 285 return ret; 286 } 287 288 clp->cl_slot_tbl = tbl; 289 return 0; 290 } 291 292 #if defined(CONFIG_NFS_V4_1) 293 294 /** 295 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 296 * @clp - nfs_client to initialize 297 * 298 * Returns zero on success, or a negative errno if some error occurred. 299 */ 300 int nfs41_init_client(struct nfs_client *clp) 301 { 302 struct nfs4_session *session = NULL; 303 304 /* 305 * Create the session and mark it expired. 306 * When a SEQUENCE operation encounters the expired session 307 * it will do session recovery to initialize it. 308 */ 309 session = nfs4_alloc_session(clp); 310 if (!session) 311 return -ENOMEM; 312 313 clp->cl_session = session; 314 315 /* 316 * The create session reply races with the server back 317 * channel probe. Mark the client NFS_CS_SESSION_INITING 318 * so that the client back channel can find the 319 * nfs_client struct 320 */ 321 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 322 return 0; 323 } 324 325 #endif /* CONFIG_NFS_V4_1 */ 326 327 /* 328 * Initialize the minor version specific parts of an NFS4 client record 329 */ 330 static int nfs4_init_client_minor_version(struct nfs_client *clp) 331 { 332 int ret; 333 334 ret = clp->cl_mvops->init_client(clp); 335 if (ret) 336 return ret; 337 return nfs4_init_callback(clp); 338 } 339 340 /** 341 * nfs4_init_client - Initialise an NFS4 client record 342 * 343 * @clp: nfs_client to initialise 344 * @timeparms: timeout parameters for underlying RPC transport 345 * @ip_addr: callback IP address in presentation format 346 * @authflavor: authentication flavor for underlying RPC transport 347 * 348 * Returns pointer to an NFS client, or an ERR_PTR value. 349 */ 350 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 351 const struct rpc_timeout *timeparms, 352 const char *ip_addr) 353 { 354 char buf[INET6_ADDRSTRLEN + 1]; 355 struct nfs_client *old; 356 int error; 357 358 if (clp->cl_cons_state == NFS_CS_READY) { 359 /* the client is initialised already */ 360 dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); 361 return clp; 362 } 363 364 /* Check NFS protocol revision and initialize RPC op vector */ 365 clp->rpc_ops = &nfs_v4_clientops; 366 367 if (clp->cl_minorversion != 0) 368 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 369 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 370 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 371 372 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_GSS_KRB5I); 373 if (error == -EINVAL) 374 error = nfs_create_rpc_client(clp, timeparms, RPC_AUTH_UNIX); 375 if (error < 0) 376 goto error; 377 378 /* If no clientaddr= option was specified, find a usable cb address */ 379 if (ip_addr == NULL) { 380 struct sockaddr_storage cb_addr; 381 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 382 383 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 384 if (error < 0) 385 goto error; 386 error = rpc_ntop(sap, buf, sizeof(buf)); 387 if (error < 0) 388 goto error; 389 ip_addr = (const char *)buf; 390 } 391 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 392 393 error = nfs_idmap_new(clp); 394 if (error < 0) { 395 dprintk("%s: failed to create idmapper. Error = %d\n", 396 __func__, error); 397 goto error; 398 } 399 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 400 401 error = nfs4_init_client_minor_version(clp); 402 if (error < 0) 403 goto error; 404 405 if (!nfs4_has_session(clp)) 406 nfs_mark_client_ready(clp, NFS_CS_READY); 407 408 error = nfs4_discover_server_trunking(clp, &old); 409 if (error < 0) 410 goto error; 411 412 if (clp != old) 413 clp->cl_preserve_clid = true; 414 nfs_put_client(clp); 415 return old; 416 417 error: 418 nfs_mark_client_ready(clp, error); 419 nfs_put_client(clp); 420 dprintk("<-- nfs4_init_client() = xerror %d\n", error); 421 return ERR_PTR(error); 422 } 423 424 /* 425 * SETCLIENTID just did a callback update with the callback ident in 426 * "drop," but server trunking discovery claims "drop" and "keep" are 427 * actually the same server. Swap the callback IDs so that "keep" 428 * will continue to use the callback ident the server now knows about, 429 * and so that "keep"'s original callback ident is destroyed when 430 * "drop" is freed. 431 */ 432 static void nfs4_swap_callback_idents(struct nfs_client *keep, 433 struct nfs_client *drop) 434 { 435 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id); 436 unsigned int save = keep->cl_cb_ident; 437 438 if (keep->cl_cb_ident == drop->cl_cb_ident) 439 return; 440 441 dprintk("%s: keeping callback ident %u and dropping ident %u\n", 442 __func__, keep->cl_cb_ident, drop->cl_cb_ident); 443 444 spin_lock(&nn->nfs_client_lock); 445 446 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident); 447 keep->cl_cb_ident = drop->cl_cb_ident; 448 449 idr_replace(&nn->cb_ident_idr, drop, save); 450 drop->cl_cb_ident = save; 451 452 spin_unlock(&nn->nfs_client_lock); 453 } 454 455 /** 456 * nfs40_walk_client_list - Find server that recognizes a client ID 457 * 458 * @new: nfs_client with client ID to test 459 * @result: OUT: found nfs_client, or new 460 * @cred: credential to use for trunking test 461 * 462 * Returns zero, a negative errno, or a negative NFS4ERR status. 463 * If zero is returned, an nfs_client pointer is planted in "result." 464 * 465 * NB: nfs40_walk_client_list() relies on the new nfs_client being 466 * the last nfs_client on the list. 467 */ 468 int nfs40_walk_client_list(struct nfs_client *new, 469 struct nfs_client **result, 470 struct rpc_cred *cred) 471 { 472 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 473 struct nfs_client *pos, *prev = NULL; 474 struct nfs4_setclientid_res clid = { 475 .clientid = new->cl_clientid, 476 .confirm = new->cl_confirm, 477 }; 478 int status = -NFS4ERR_STALE_CLIENTID; 479 480 spin_lock(&nn->nfs_client_lock); 481 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 482 483 if (pos->rpc_ops != new->rpc_ops) 484 continue; 485 486 if (pos->cl_proto != new->cl_proto) 487 continue; 488 489 if (pos->cl_minorversion != new->cl_minorversion) 490 continue; 491 492 /* If "pos" isn't marked ready, we can't trust the 493 * remaining fields in "pos" */ 494 if (pos->cl_cons_state > NFS_CS_READY) { 495 atomic_inc(&pos->cl_count); 496 spin_unlock(&nn->nfs_client_lock); 497 498 nfs_put_client(prev); 499 prev = pos; 500 501 status = nfs_wait_client_init_complete(pos); 502 if (status < 0) 503 goto out; 504 status = -NFS4ERR_STALE_CLIENTID; 505 spin_lock(&nn->nfs_client_lock); 506 } 507 if (pos->cl_cons_state != NFS_CS_READY) 508 continue; 509 510 if (pos->cl_clientid != new->cl_clientid) 511 continue; 512 513 atomic_inc(&pos->cl_count); 514 spin_unlock(&nn->nfs_client_lock); 515 516 nfs_put_client(prev); 517 prev = pos; 518 519 status = nfs4_proc_setclientid_confirm(pos, &clid, cred); 520 switch (status) { 521 case -NFS4ERR_STALE_CLIENTID: 522 break; 523 case 0: 524 nfs4_swap_callback_idents(pos, new); 525 526 prev = NULL; 527 *result = pos; 528 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 529 __func__, pos, atomic_read(&pos->cl_count)); 530 goto out; 531 case -ERESTARTSYS: 532 case -ETIMEDOUT: 533 /* The callback path may have been inadvertently 534 * changed. Schedule recovery! 535 */ 536 nfs4_schedule_path_down_recovery(pos); 537 default: 538 goto out; 539 } 540 541 spin_lock(&nn->nfs_client_lock); 542 } 543 spin_unlock(&nn->nfs_client_lock); 544 545 /* No match found. The server lost our clientid */ 546 out: 547 nfs_put_client(prev); 548 dprintk("NFS: <-- %s status = %d\n", __func__, status); 549 return status; 550 } 551 552 #ifdef CONFIG_NFS_V4_1 553 /* 554 * Returns true if the client IDs match 555 */ 556 static bool nfs4_match_clientids(struct nfs_client *a, struct nfs_client *b) 557 { 558 if (a->cl_clientid != b->cl_clientid) { 559 dprintk("NFS: --> %s client ID %llx does not match %llx\n", 560 __func__, a->cl_clientid, b->cl_clientid); 561 return false; 562 } 563 dprintk("NFS: --> %s client ID %llx matches %llx\n", 564 __func__, a->cl_clientid, b->cl_clientid); 565 return true; 566 } 567 568 /* 569 * Returns true if the server owners match 570 */ 571 static bool 572 nfs4_match_serverowners(struct nfs_client *a, struct nfs_client *b) 573 { 574 struct nfs41_server_owner *o1 = a->cl_serverowner; 575 struct nfs41_server_owner *o2 = b->cl_serverowner; 576 577 if (o1->minor_id != o2->minor_id) { 578 dprintk("NFS: --> %s server owner minor IDs do not match\n", 579 __func__); 580 return false; 581 } 582 583 if (o1->major_id_sz != o2->major_id_sz) 584 goto out_major_mismatch; 585 if (memcmp(o1->major_id, o2->major_id, o1->major_id_sz) != 0) 586 goto out_major_mismatch; 587 588 dprintk("NFS: --> %s server owners match\n", __func__); 589 return true; 590 591 out_major_mismatch: 592 dprintk("NFS: --> %s server owner major IDs do not match\n", 593 __func__); 594 return false; 595 } 596 597 /** 598 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 599 * 600 * @new: nfs_client with client ID to test 601 * @result: OUT: found nfs_client, or new 602 * @cred: credential to use for trunking test 603 * 604 * Returns zero, a negative errno, or a negative NFS4ERR status. 605 * If zero is returned, an nfs_client pointer is planted in "result." 606 * 607 * NB: nfs41_walk_client_list() relies on the new nfs_client being 608 * the last nfs_client on the list. 609 */ 610 int nfs41_walk_client_list(struct nfs_client *new, 611 struct nfs_client **result, 612 struct rpc_cred *cred) 613 { 614 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 615 struct nfs_client *pos, *prev = NULL; 616 int status = -NFS4ERR_STALE_CLIENTID; 617 618 spin_lock(&nn->nfs_client_lock); 619 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 620 621 if (pos->rpc_ops != new->rpc_ops) 622 continue; 623 624 if (pos->cl_proto != new->cl_proto) 625 continue; 626 627 if (pos->cl_minorversion != new->cl_minorversion) 628 continue; 629 630 /* If "pos" isn't marked ready, we can't trust the 631 * remaining fields in "pos", especially the client 632 * ID and serverowner fields. Wait for CREATE_SESSION 633 * to finish. */ 634 if (pos->cl_cons_state > NFS_CS_READY) { 635 atomic_inc(&pos->cl_count); 636 spin_unlock(&nn->nfs_client_lock); 637 638 nfs_put_client(prev); 639 prev = pos; 640 641 status = nfs_wait_client_init_complete(pos); 642 if (status == 0) { 643 nfs4_schedule_lease_recovery(pos); 644 status = nfs4_wait_clnt_recover(pos); 645 } 646 spin_lock(&nn->nfs_client_lock); 647 if (status < 0) 648 break; 649 status = -NFS4ERR_STALE_CLIENTID; 650 } 651 if (pos->cl_cons_state != NFS_CS_READY) 652 continue; 653 654 if (!nfs4_match_clientids(pos, new)) 655 continue; 656 657 if (!nfs4_match_serverowners(pos, new)) 658 continue; 659 660 atomic_inc(&pos->cl_count); 661 *result = pos; 662 status = 0; 663 dprintk("NFS: <-- %s using nfs_client = %p ({%d})\n", 664 __func__, pos, atomic_read(&pos->cl_count)); 665 break; 666 } 667 668 /* No matching nfs_client found. */ 669 spin_unlock(&nn->nfs_client_lock); 670 dprintk("NFS: <-- %s status = %d\n", __func__, status); 671 nfs_put_client(prev); 672 return status; 673 } 674 #endif /* CONFIG_NFS_V4_1 */ 675 676 static void nfs4_destroy_server(struct nfs_server *server) 677 { 678 nfs_server_return_all_delegations(server); 679 unset_pnfs_layoutdriver(server); 680 nfs4_purge_state_owners(server); 681 } 682 683 /* 684 * NFSv4.0 callback thread helper 685 * 686 * Find a client by callback identifier 687 */ 688 struct nfs_client * 689 nfs4_find_client_ident(struct net *net, int cb_ident) 690 { 691 struct nfs_client *clp; 692 struct nfs_net *nn = net_generic(net, nfs_net_id); 693 694 spin_lock(&nn->nfs_client_lock); 695 clp = idr_find(&nn->cb_ident_idr, cb_ident); 696 if (clp) 697 atomic_inc(&clp->cl_count); 698 spin_unlock(&nn->nfs_client_lock); 699 return clp; 700 } 701 702 #if defined(CONFIG_NFS_V4_1) 703 /* Common match routine for v4.0 and v4.1 callback services */ 704 static bool nfs4_cb_match_client(const struct sockaddr *addr, 705 struct nfs_client *clp, u32 minorversion) 706 { 707 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 708 709 /* Don't match clients that failed to initialise */ 710 if (!(clp->cl_cons_state == NFS_CS_READY || 711 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 712 return false; 713 714 smp_rmb(); 715 716 /* Match the version and minorversion */ 717 if (clp->rpc_ops->version != 4 || 718 clp->cl_minorversion != minorversion) 719 return false; 720 721 /* Match only the IP address, not the port number */ 722 if (!nfs_sockaddr_match_ipaddr(addr, clap)) 723 return false; 724 725 return true; 726 } 727 728 /* 729 * NFSv4.1 callback thread helper 730 * For CB_COMPOUND calls, find a client by IP address, protocol version, 731 * minorversion, and sessionID 732 * 733 * Returns NULL if no such client 734 */ 735 struct nfs_client * 736 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 737 struct nfs4_sessionid *sid, u32 minorversion) 738 { 739 struct nfs_client *clp; 740 struct nfs_net *nn = net_generic(net, nfs_net_id); 741 742 spin_lock(&nn->nfs_client_lock); 743 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 744 if (nfs4_cb_match_client(addr, clp, minorversion) == false) 745 continue; 746 747 if (!nfs4_has_session(clp)) 748 continue; 749 750 /* Match sessionid*/ 751 if (memcmp(clp->cl_session->sess_id.data, 752 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 753 continue; 754 755 atomic_inc(&clp->cl_count); 756 spin_unlock(&nn->nfs_client_lock); 757 return clp; 758 } 759 spin_unlock(&nn->nfs_client_lock); 760 return NULL; 761 } 762 763 #else /* CONFIG_NFS_V4_1 */ 764 765 struct nfs_client * 766 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 767 struct nfs4_sessionid *sid, u32 minorversion) 768 { 769 return NULL; 770 } 771 #endif /* CONFIG_NFS_V4_1 */ 772 773 /* 774 * Set up an NFS4 client 775 */ 776 static int nfs4_set_client(struct nfs_server *server, 777 const char *hostname, 778 const struct sockaddr *addr, 779 const size_t addrlen, 780 const char *ip_addr, 781 rpc_authflavor_t authflavour, 782 int proto, const struct rpc_timeout *timeparms, 783 u32 minorversion, struct net *net) 784 { 785 struct nfs_client_initdata cl_init = { 786 .hostname = hostname, 787 .addr = addr, 788 .addrlen = addrlen, 789 .nfs_mod = &nfs_v4, 790 .proto = proto, 791 .minorversion = minorversion, 792 .net = net, 793 }; 794 struct nfs_client *clp; 795 int error; 796 797 dprintk("--> nfs4_set_client()\n"); 798 799 if (server->flags & NFS_MOUNT_NORESVPORT) 800 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 801 if (server->options & NFS_OPTION_MIGRATION) 802 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags); 803 804 /* Allocate or find a client reference we can use */ 805 clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour); 806 if (IS_ERR(clp)) { 807 error = PTR_ERR(clp); 808 goto error; 809 } 810 811 /* 812 * Query for the lease time on clientid setup or renewal 813 * 814 * Note that this will be set on nfs_clients that were created 815 * only for the DS role and did not set this bit, but now will 816 * serve a dual role. 817 */ 818 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 819 820 server->nfs_client = clp; 821 dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); 822 return 0; 823 error: 824 dprintk("<-- nfs4_set_client() = xerror %d\n", error); 825 return error; 826 } 827 828 /* 829 * Set up a pNFS Data Server client. 830 * 831 * Return any existing nfs_client that matches server address,port,version 832 * and minorversion. 833 * 834 * For a new nfs_client, use a soft mount (default), a low retrans and a 835 * low timeout interval so that if a connection is lost, we retry through 836 * the MDS. 837 */ 838 struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, 839 const struct sockaddr *ds_addr, int ds_addrlen, 840 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans) 841 { 842 struct nfs_client_initdata cl_init = { 843 .addr = ds_addr, 844 .addrlen = ds_addrlen, 845 .nfs_mod = &nfs_v4, 846 .proto = ds_proto, 847 .minorversion = mds_clp->cl_minorversion, 848 .net = mds_clp->cl_net, 849 }; 850 struct rpc_timeout ds_timeout; 851 struct nfs_client *clp; 852 char buf[INET6_ADDRSTRLEN + 1]; 853 854 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0) 855 return ERR_PTR(-EINVAL); 856 cl_init.hostname = buf; 857 858 /* 859 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 860 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 861 * (section 13.1 RFC 5661). 862 */ 863 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 864 clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, 865 mds_clp->cl_rpcclient->cl_auth->au_flavor); 866 867 dprintk("<-- %s %p\n", __func__, clp); 868 return clp; 869 } 870 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 871 872 /* 873 * Session has been established, and the client marked ready. 874 * Set the mount rsize and wsize with negotiated fore channel 875 * attributes which will be bound checked in nfs_server_set_fsinfo. 876 */ 877 static void nfs4_session_set_rwsize(struct nfs_server *server) 878 { 879 #ifdef CONFIG_NFS_V4_1 880 struct nfs4_session *sess; 881 u32 server_resp_sz; 882 u32 server_rqst_sz; 883 884 if (!nfs4_has_session(server->nfs_client)) 885 return; 886 sess = server->nfs_client->cl_session; 887 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 888 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 889 890 if (server->rsize > server_resp_sz) 891 server->rsize = server_resp_sz; 892 if (server->wsize > server_rqst_sz) 893 server->wsize = server_rqst_sz; 894 #endif /* CONFIG_NFS_V4_1 */ 895 } 896 897 static int nfs4_server_common_setup(struct nfs_server *server, 898 struct nfs_fh *mntfh, bool auth_probe) 899 { 900 struct nfs_fattr *fattr; 901 int error; 902 903 /* data servers support only a subset of NFSv4.1 */ 904 if (is_ds_only_client(server->nfs_client)) 905 return -EPROTONOSUPPORT; 906 907 fattr = nfs_alloc_fattr(); 908 if (fattr == NULL) 909 return -ENOMEM; 910 911 /* We must ensure the session is initialised first */ 912 error = nfs4_init_session(server->nfs_client); 913 if (error < 0) 914 goto out; 915 916 /* Set the basic capabilities */ 917 server->caps |= server->nfs_client->cl_mvops->init_caps; 918 if (server->flags & NFS_MOUNT_NORDIRPLUS) 919 server->caps &= ~NFS_CAP_READDIRPLUS; 920 /* 921 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower 922 * authentication. 923 */ 924 if (nfs4_disable_idmapping && 925 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) 926 server->caps |= NFS_CAP_UIDGID_NOMAP; 927 928 929 /* Probe the root fh to retrieve its FSID and filehandle */ 930 error = nfs4_get_rootfh(server, mntfh, auth_probe); 931 if (error < 0) 932 goto out; 933 934 dprintk("Server FSID: %llx:%llx\n", 935 (unsigned long long) server->fsid.major, 936 (unsigned long long) server->fsid.minor); 937 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 938 939 nfs4_session_set_rwsize(server); 940 941 error = nfs_probe_fsinfo(server, mntfh, fattr); 942 if (error < 0) 943 goto out; 944 945 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) 946 server->namelen = NFS4_MAXNAMLEN; 947 948 nfs_server_insert_lists(server); 949 server->mount_time = jiffies; 950 server->destroy = nfs4_destroy_server; 951 out: 952 nfs_free_fattr(fattr); 953 return error; 954 } 955 956 /* 957 * Create a version 4 volume record 958 */ 959 static int nfs4_init_server(struct nfs_server *server, 960 struct nfs_parsed_mount_data *data) 961 { 962 struct rpc_timeout timeparms; 963 int error; 964 965 dprintk("--> nfs4_init_server()\n"); 966 967 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, 968 data->timeo, data->retrans); 969 970 /* Initialise the client representation from the mount data */ 971 server->flags = data->flags; 972 server->options = data->options; 973 server->auth_info = data->auth_info; 974 975 /* Use the first specified auth flavor. If this flavor isn't 976 * allowed by the server, use the SECINFO path to try the 977 * other specified flavors */ 978 if (data->auth_info.flavor_len >= 1) 979 data->selected_flavor = data->auth_info.flavors[0]; 980 else 981 data->selected_flavor = RPC_AUTH_UNIX; 982 983 /* Get a client record */ 984 error = nfs4_set_client(server, 985 data->nfs_server.hostname, 986 (const struct sockaddr *)&data->nfs_server.address, 987 data->nfs_server.addrlen, 988 data->client_address, 989 data->selected_flavor, 990 data->nfs_server.protocol, 991 &timeparms, 992 data->minorversion, 993 data->net); 994 if (error < 0) 995 goto error; 996 997 if (data->rsize) 998 server->rsize = nfs_block_size(data->rsize, NULL); 999 if (data->wsize) 1000 server->wsize = nfs_block_size(data->wsize, NULL); 1001 1002 server->acregmin = data->acregmin * HZ; 1003 server->acregmax = data->acregmax * HZ; 1004 server->acdirmin = data->acdirmin * HZ; 1005 server->acdirmax = data->acdirmax * HZ; 1006 1007 server->port = data->nfs_server.port; 1008 1009 error = nfs_init_server_rpcclient(server, &timeparms, 1010 data->selected_flavor); 1011 1012 error: 1013 /* Done */ 1014 dprintk("<-- nfs4_init_server() = %d\n", error); 1015 return error; 1016 } 1017 1018 /* 1019 * Create a version 4 volume record 1020 * - keyed on server and FSID 1021 */ 1022 /*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, 1023 struct nfs_fh *mntfh)*/ 1024 struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info, 1025 struct nfs_subversion *nfs_mod) 1026 { 1027 struct nfs_server *server; 1028 bool auth_probe; 1029 int error; 1030 1031 dprintk("--> nfs4_create_server()\n"); 1032 1033 server = nfs_alloc_server(); 1034 if (!server) 1035 return ERR_PTR(-ENOMEM); 1036 1037 auth_probe = mount_info->parsed->auth_info.flavor_len < 1; 1038 1039 /* set up the general RPC client */ 1040 error = nfs4_init_server(server, mount_info->parsed); 1041 if (error < 0) 1042 goto error; 1043 1044 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe); 1045 if (error < 0) 1046 goto error; 1047 1048 dprintk("<-- nfs4_create_server() = %p\n", server); 1049 return server; 1050 1051 error: 1052 nfs_free_server(server); 1053 dprintk("<-- nfs4_create_server() = error %d\n", error); 1054 return ERR_PTR(error); 1055 } 1056 1057 /* 1058 * Create an NFS4 referral server record 1059 */ 1060 struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, 1061 struct nfs_fh *mntfh) 1062 { 1063 struct nfs_client *parent_client; 1064 struct nfs_server *server, *parent_server; 1065 bool auth_probe; 1066 int error; 1067 1068 dprintk("--> nfs4_create_referral_server()\n"); 1069 1070 server = nfs_alloc_server(); 1071 if (!server) 1072 return ERR_PTR(-ENOMEM); 1073 1074 parent_server = NFS_SB(data->sb); 1075 parent_client = parent_server->nfs_client; 1076 1077 /* Initialise the client representation from the parent server */ 1078 nfs_server_copy_userdata(server, parent_server); 1079 1080 /* Get a client representation. 1081 * Note: NFSv4 always uses TCP, */ 1082 error = nfs4_set_client(server, data->hostname, 1083 data->addr, 1084 data->addrlen, 1085 parent_client->cl_ipaddr, 1086 data->authflavor, 1087 rpc_protocol(parent_server->client), 1088 parent_server->client->cl_timeout, 1089 parent_client->cl_mvops->minor_version, 1090 parent_client->cl_net); 1091 if (error < 0) 1092 goto error; 1093 1094 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); 1095 if (error < 0) 1096 goto error; 1097 1098 auth_probe = parent_server->auth_info.flavor_len < 1; 1099 1100 error = nfs4_server_common_setup(server, mntfh, auth_probe); 1101 if (error < 0) 1102 goto error; 1103 1104 dprintk("<-- nfs_create_referral_server() = %p\n", server); 1105 return server; 1106 1107 error: 1108 nfs_free_server(server); 1109 dprintk("<-- nfs4_create_referral_server() = error %d\n", error); 1110 return ERR_PTR(error); 1111 } 1112 1113 /* 1114 * Grab the destination's particulars, including lease expiry time. 1115 * 1116 * Returns zero if probe succeeded and retrieved FSID matches the FSID 1117 * we have cached. 1118 */ 1119 static int nfs_probe_destination(struct nfs_server *server) 1120 { 1121 struct inode *inode = server->super->s_root->d_inode; 1122 struct nfs_fattr *fattr; 1123 int error; 1124 1125 fattr = nfs_alloc_fattr(); 1126 if (fattr == NULL) 1127 return -ENOMEM; 1128 1129 /* Sanity: the probe won't work if the destination server 1130 * does not recognize the migrated FH. */ 1131 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr); 1132 1133 nfs_free_fattr(fattr); 1134 return error; 1135 } 1136 1137 /** 1138 * nfs4_update_server - Move an nfs_server to a different nfs_client 1139 * 1140 * @server: represents FSID to be moved 1141 * @hostname: new end-point's hostname 1142 * @sap: new end-point's socket address 1143 * @salen: size of "sap" 1144 * @net: net namespace 1145 * 1146 * The nfs_server must be quiescent before this function is invoked. 1147 * Either its session is drained (NFSv4.1+), or its transport is 1148 * plugged and drained (NFSv4.0). 1149 * 1150 * Returns zero on success, or a negative errno value. 1151 */ 1152 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1153 struct sockaddr *sap, size_t salen, struct net *net) 1154 { 1155 struct nfs_client *clp = server->nfs_client; 1156 struct rpc_clnt *clnt = server->client; 1157 struct xprt_create xargs = { 1158 .ident = clp->cl_proto, 1159 .net = net, 1160 .dstaddr = sap, 1161 .addrlen = salen, 1162 .servername = hostname, 1163 }; 1164 char buf[INET6_ADDRSTRLEN + 1]; 1165 struct sockaddr_storage address; 1166 struct sockaddr *localaddr = (struct sockaddr *)&address; 1167 int error; 1168 1169 dprintk("--> %s: move FSID %llx:%llx to \"%s\")\n", __func__, 1170 (unsigned long long)server->fsid.major, 1171 (unsigned long long)server->fsid.minor, 1172 hostname); 1173 1174 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1175 if (error != 0) { 1176 dprintk("<-- %s(): rpc_switch_client_transport returned %d\n", 1177 __func__, error); 1178 goto out; 1179 } 1180 1181 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1182 if (error != 0) { 1183 dprintk("<-- %s(): rpc_localaddr returned %d\n", 1184 __func__, error); 1185 goto out; 1186 } 1187 1188 error = -EAFNOSUPPORT; 1189 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) { 1190 dprintk("<-- %s(): rpc_ntop returned %d\n", 1191 __func__, error); 1192 goto out; 1193 } 1194 1195 nfs_server_remove_lists(server); 1196 error = nfs4_set_client(server, hostname, sap, salen, buf, 1197 clp->cl_rpcclient->cl_auth->au_flavor, 1198 clp->cl_proto, clnt->cl_timeout, 1199 clp->cl_minorversion, net); 1200 nfs_put_client(clp); 1201 if (error != 0) { 1202 nfs_server_insert_lists(server); 1203 dprintk("<-- %s(): nfs4_set_client returned %d\n", 1204 __func__, error); 1205 goto out; 1206 } 1207 1208 if (server->nfs_client->cl_hostname == NULL) 1209 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1210 nfs_server_insert_lists(server); 1211 1212 error = nfs_probe_destination(server); 1213 if (error < 0) 1214 goto out; 1215 1216 dprintk("<-- %s() succeeded\n", __func__); 1217 1218 out: 1219 return error; 1220 } 1221