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