1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 */ 6 #include <linux/module.h> 7 #include <linux/nfs_fs.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 <net/handshake.h> 15 #include "internal.h" 16 #include "callback.h" 17 #include "delegation.h" 18 #include "nfs4session.h" 19 #include "nfs4idmap.h" 20 #include "pnfs.h" 21 #include "netns.h" 22 #include "sysfs.h" 23 24 #define NFSDBG_FACILITY NFSDBG_CLIENT 25 26 /* 27 * Get a unique NFSv4.0 callback identifier which will be used 28 * by the V4.0 callback service to lookup the nfs_client struct 29 */ 30 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion) 31 { 32 int ret = 0; 33 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); 34 35 if (clp->rpc_ops->version != 4 || minorversion != 0) 36 return ret; 37 idr_preload(GFP_KERNEL); 38 spin_lock(&nn->nfs_client_lock); 39 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT); 40 if (ret >= 0) 41 clp->cl_cb_ident = ret; 42 spin_unlock(&nn->nfs_client_lock); 43 idr_preload_end(); 44 return ret < 0 ? ret : 0; 45 } 46 47 /* 48 * Per auth flavor data server rpc clients 49 */ 50 struct nfs4_ds_server { 51 struct list_head list; /* ds_clp->cl_ds_clients */ 52 struct rpc_clnt *rpc_clnt; 53 }; 54 55 /** 56 * nfs4_find_ds_client - Common lookup case for DS I/O 57 * @ds_clp: pointer to the DS's nfs_client 58 * @flavor: rpc auth flavour to match 59 */ 60 static struct nfs4_ds_server * 61 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 62 { 63 struct nfs4_ds_server *dss; 64 65 rcu_read_lock(); 66 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) { 67 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 68 continue; 69 goto out; 70 } 71 dss = NULL; 72 out: 73 rcu_read_unlock(); 74 return dss; 75 } 76 77 static struct nfs4_ds_server * 78 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor, 79 struct nfs4_ds_server *new) 80 { 81 struct nfs4_ds_server *dss; 82 83 spin_lock(&ds_clp->cl_lock); 84 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) { 85 if (dss->rpc_clnt->cl_auth->au_flavor != flavor) 86 continue; 87 goto out; 88 } 89 if (new) 90 list_add_rcu(&new->list, &ds_clp->cl_ds_clients); 91 dss = new; 92 out: 93 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */ 94 return dss; 95 } 96 97 static struct nfs4_ds_server * 98 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor) 99 { 100 struct nfs4_ds_server *dss; 101 102 dss = kmalloc_obj(*dss, GFP_NOFS); 103 if (dss == NULL) 104 return ERR_PTR(-ENOMEM); 105 106 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor); 107 if (IS_ERR(dss->rpc_clnt)) { 108 int err = PTR_ERR(dss->rpc_clnt); 109 kfree (dss); 110 return ERR_PTR(err); 111 } 112 INIT_LIST_HEAD(&dss->list); 113 114 return dss; 115 } 116 117 static void 118 nfs4_free_ds_server(struct nfs4_ds_server *dss) 119 { 120 rpc_release_client(dss->rpc_clnt); 121 kfree(dss); 122 } 123 124 /** 125 * nfs4_find_or_create_ds_client - Find or create a DS rpc client 126 * @ds_clp: pointer to the DS's nfs_client 127 * @inode: pointer to the inode 128 * 129 * Find or create a DS rpc client with th MDS server rpc client auth flavor 130 * in the nfs_client cl_ds_clients list. 131 */ 132 struct rpc_clnt * 133 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode) 134 { 135 struct nfs4_ds_server *dss, *new; 136 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor; 137 138 dss = nfs4_find_ds_client(ds_clp, flavor); 139 if (dss != NULL) 140 goto out; 141 new = nfs4_alloc_ds_server(ds_clp, flavor); 142 if (IS_ERR(new)) 143 return ERR_CAST(new); 144 dss = nfs4_add_ds_client(ds_clp, flavor, new); 145 if (dss != new) 146 nfs4_free_ds_server(new); 147 out: 148 return dss->rpc_clnt; 149 } 150 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client); 151 152 static void 153 nfs4_shutdown_ds_clients(struct nfs_client *clp) 154 { 155 struct nfs4_ds_server *dss; 156 157 while (!list_empty(&clp->cl_ds_clients)) { 158 dss = list_entry(clp->cl_ds_clients.next, 159 struct nfs4_ds_server, list); 160 list_del(&dss->list); 161 rpc_shutdown_client(dss->rpc_clnt); 162 kfree (dss); 163 } 164 } 165 166 static void 167 nfs4_cleanup_callback(struct nfs_client *clp) 168 { 169 struct nfs4_copy_state *cp_state; 170 171 while (!list_empty(&clp->pending_cb_stateids)) { 172 cp_state = list_entry(clp->pending_cb_stateids.next, 173 struct nfs4_copy_state, copies); 174 list_del(&cp_state->copies); 175 kfree(cp_state); 176 } 177 } 178 179 void nfs41_shutdown_client(struct nfs_client *clp) 180 { 181 if (nfs4_has_session(clp)) { 182 nfs4_cleanup_callback(clp); 183 nfs4_shutdown_ds_clients(clp); 184 nfs4_destroy_session(clp->cl_session); 185 nfs4_destroy_clientid(clp); 186 } 187 188 } 189 190 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init) 191 { 192 char buf[INET6_ADDRSTRLEN + 1]; 193 const char *ip_addr = cl_init->ip_addr; 194 struct nfs_client *clp = nfs_alloc_client(cl_init); 195 int err; 196 197 if (IS_ERR(clp)) 198 return clp; 199 200 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion); 201 if (err) 202 goto error; 203 204 if (cl_init->minorversion < NFS4_MIN_MINOR_VERSION || 205 cl_init->minorversion > NFS4_MAX_MINOR_VERSION) { 206 err = -EINVAL; 207 goto error; 208 } 209 210 spin_lock_init(&clp->cl_lock); 211 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state); 212 INIT_LIST_HEAD(&clp->cl_ds_clients); 213 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client"); 214 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED; 215 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion]; 216 clp->cl_mig_gen = 1; 217 clp->cl_last_renewal = jiffies; 218 init_waitqueue_head(&clp->cl_lock_waitq); 219 INIT_LIST_HEAD(&clp->pending_cb_stateids); 220 221 if (cl_init->minorversion != 0) 222 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags); 223 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); 224 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags); 225 if (test_bit(NFS_CS_PNFS, &cl_init->init_flags)) 226 __set_bit(NFS_CS_PNFS, &clp->cl_flags); 227 if (test_bit(NFS_CS_NETUNREACH_FATAL, &cl_init->init_flags)) 228 __set_bit(NFS_CS_NETUNREACH_FATAL, &clp->cl_flags); 229 /* 230 * Set up the connection to the server before we add add to the 231 * global list. 232 */ 233 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I); 234 if (err == -EINVAL) 235 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX); 236 if (err < 0) 237 goto error; 238 239 /* If no clientaddr= option was specified, find a usable cb address */ 240 if (ip_addr == NULL) { 241 struct sockaddr_storage cb_addr; 242 struct sockaddr *sap = (struct sockaddr *)&cb_addr; 243 244 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); 245 if (err < 0) 246 goto error; 247 err = rpc_ntop(sap, buf, sizeof(buf)); 248 if (err < 0) 249 goto error; 250 ip_addr = (const char *)buf; 251 } 252 strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); 253 254 err = nfs_idmap_new(clp); 255 if (err < 0) { 256 dprintk("%s: failed to create idmapper. Error = %d\n", 257 __func__, err); 258 goto error; 259 } 260 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); 261 return clp; 262 263 error: 264 nfs_free_client(clp); 265 return ERR_PTR(err); 266 } 267 268 /* 269 * Destroy the NFS4 callback service 270 */ 271 static void nfs4_destroy_callback(struct nfs_client *clp) 272 { 273 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state)) { 274 struct rpc_xprt *xprt; 275 276 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 277 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net, 278 xprt); 279 } 280 } 281 282 static void nfs4_shutdown_client(struct nfs_client *clp) 283 { 284 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state)) 285 nfs4_kill_renewd(clp); 286 clp->cl_mvops->shutdown_client(clp); 287 nfs4_destroy_callback(clp); 288 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state)) 289 nfs_idmap_delete(clp); 290 291 rpc_destroy_wait_queue(&clp->cl_rpcwaitq); 292 kfree(clp->cl_serverowner); 293 kfree(clp->cl_serverscope); 294 kfree(clp->cl_implid); 295 kfree(clp->cl_owner_id); 296 } 297 298 void nfs4_free_client(struct nfs_client *clp) 299 { 300 nfs4_shutdown_client(clp); 301 nfs_free_client(clp); 302 } 303 304 /* 305 * Initialize the NFS4 callback service 306 */ 307 static int nfs4_init_callback(struct nfs_client *clp) 308 { 309 struct rpc_xprt *xprt; 310 int error; 311 312 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); 313 314 if (nfs4_has_session(clp)) { 315 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS); 316 if (error < 0) 317 return error; 318 } 319 320 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); 321 if (error < 0) { 322 dprintk("%s: failed to start callback. Error = %d\n", 323 __func__, error); 324 return error; 325 } 326 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); 327 328 return 0; 329 } 330 331 /** 332 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+ 333 * @clp: nfs_client to initialize 334 * 335 * Returns zero on success, or a negative errno if some error occurred. 336 */ 337 int nfs41_init_client(struct nfs_client *clp) 338 { 339 struct nfs4_session *session = NULL; 340 341 /* 342 * Create the session and mark it expired. 343 * When a SEQUENCE operation encounters the expired session 344 * it will do session recovery to initialize it. 345 */ 346 session = nfs4_alloc_session(clp); 347 if (!session) 348 return -ENOMEM; 349 350 clp->cl_session = session; 351 352 /* 353 * The create session reply races with the server back 354 * channel probe. Mark the client NFS_CS_SESSION_INITING 355 * so that the client back channel can find the 356 * nfs_client struct 357 */ 358 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); 359 return 0; 360 } 361 362 /* 363 * Initialize the minor version specific parts of an NFS4 client record 364 */ 365 static int nfs4_init_client_minor_version(struct nfs_client *clp) 366 { 367 int ret; 368 369 ret = clp->cl_mvops->init_client(clp); 370 if (ret) 371 return ret; 372 return nfs4_init_callback(clp); 373 } 374 375 static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old) 376 { 377 struct sockaddr_storage clp_addr, old_addr; 378 struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr; 379 struct sockaddr *old_sap = (struct sockaddr *)&old_addr; 380 size_t clp_salen; 381 struct xprt_create xprt_args = { 382 .ident = old->cl_proto, 383 .net = old->cl_net, 384 .servername = old->cl_hostname, 385 }; 386 int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ? 387 clp->cl_max_connect : old->cl_max_connect; 388 389 if (clp->cl_proto != old->cl_proto) 390 return; 391 clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr)); 392 rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr)); 393 394 if (clp_addr.ss_family != old_addr.ss_family) 395 return; 396 397 xprt_args.dstaddr = clp_sap; 398 xprt_args.addrlen = clp_salen; 399 400 rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args, 401 rpc_clnt_test_and_add_xprt, &max_connect); 402 } 403 404 /** 405 * nfs4_init_client - Initialise an NFS4 client record 406 * 407 * @clp: nfs_client to initialise 408 * @cl_init: pointer to nfs_client_initdata 409 * 410 * Returns pointer to an NFS client, or an ERR_PTR value. 411 */ 412 struct nfs_client *nfs4_init_client(struct nfs_client *clp, 413 const struct nfs_client_initdata *cl_init) 414 { 415 struct nfs_client *old; 416 int error; 417 418 if (clp->cl_cons_state == NFS_CS_READY) 419 /* the client is initialised already */ 420 return clp; 421 422 error = nfs4_init_client_minor_version(clp); 423 if (error < 0) 424 goto error; 425 426 error = nfs4_discover_server_trunking(clp, &old); 427 if (error < 0) 428 goto error; 429 430 if (clp != old) { 431 clp->cl_preserve_clid = true; 432 /* 433 * Mark the client as having failed initialization so other 434 * processes walking the nfs_client_list in nfs_match_client() 435 * won't try to use it. 436 */ 437 nfs_mark_client_ready(clp, -EPERM); 438 if (old->cl_mvops->session_trunk) 439 nfs4_add_trunk(clp, old); 440 } 441 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags); 442 nfs_put_client(clp); 443 return old; 444 445 error: 446 nfs_mark_client_ready(clp, error); 447 nfs_put_client(clp); 448 return ERR_PTR(error); 449 } 450 451 static bool nfs4_match_client_owner_id(const struct nfs_client *clp1, 452 const struct nfs_client *clp2) 453 { 454 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL) 455 return true; 456 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0; 457 } 458 459 int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new, 460 struct nfs_client **prev, struct nfs_net *nn) 461 { 462 int status; 463 464 if (pos->rpc_ops != new->rpc_ops) 465 return 1; 466 467 if (pos->cl_minorversion != new->cl_minorversion) 468 return 1; 469 470 /* If "pos" isn't marked ready, we can't trust the 471 * remaining fields in "pos", especially the client 472 * ID and serverowner fields. Wait for CREATE_SESSION 473 * to finish. */ 474 if (pos->cl_cons_state > NFS_CS_READY) { 475 refcount_inc(&pos->cl_count); 476 spin_unlock(&nn->nfs_client_lock); 477 478 nfs_put_client(*prev); 479 *prev = pos; 480 481 status = nfs_wait_client_init_complete(pos); 482 spin_lock(&nn->nfs_client_lock); 483 484 if (status < 0) 485 return status; 486 } 487 488 if (pos->cl_cons_state != NFS_CS_READY) 489 return 1; 490 491 if (pos->cl_clientid != new->cl_clientid) 492 return 1; 493 494 /* NFSv4.1 always uses the uniform string, however someone 495 * might switch the uniquifier string on us. 496 */ 497 if (!nfs4_match_client_owner_id(pos, new)) 498 return 1; 499 500 return 0; 501 } 502 503 /* 504 * Returns true if the server major ids match 505 */ 506 bool 507 nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1, 508 struct nfs41_server_owner *o2) 509 { 510 if (o1->major_id_sz != o2->major_id_sz) 511 return false; 512 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0; 513 } 514 515 /* 516 * Returns true if the server scopes match 517 */ 518 static bool 519 nfs4_check_server_scope(struct nfs41_server_scope *s1, 520 struct nfs41_server_scope *s2) 521 { 522 if (s1->server_scope_sz != s2->server_scope_sz) 523 return false; 524 return memcmp(s1->server_scope, s2->server_scope, 525 s1->server_scope_sz) == 0; 526 } 527 528 /** 529 * nfs4_detect_session_trunking - Checks for session trunking. 530 * @clp: original mount nfs_client 531 * @res: result structure from an exchange_id using the original mount 532 * nfs_client with a new multi_addr transport 533 * @xprt: pointer to the transport to add. 534 * 535 * Called after a successful EXCHANGE_ID on a multi-addr connection. 536 * Upon success, add the transport. 537 * 538 * Returns zero on success, otherwise -EINVAL 539 * 540 * Note: since the exchange_id for the new multi_addr transport uses the 541 * same nfs_client from the original mount, the cl_owner_id is reused, 542 * so eir_clientowner is the same. 543 */ 544 int nfs4_detect_session_trunking(struct nfs_client *clp, 545 struct nfs41_exchange_id_res *res, 546 struct rpc_xprt *xprt) 547 { 548 /* Check eir_clientid */ 549 if (clp->cl_clientid != res->clientid) 550 goto out_err; 551 552 /* Check eir_server_owner so_major_id */ 553 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner, 554 res->server_owner)) 555 goto out_err; 556 557 /* Check eir_server_owner so_minor_id */ 558 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id) 559 goto out_err; 560 561 /* Check eir_server_scope */ 562 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope)) 563 goto out_err; 564 565 pr_info("NFS: %s: Session trunking succeeded for %s\n", 566 clp->cl_hostname, 567 xprt->address_strings[RPC_DISPLAY_ADDR]); 568 569 return 0; 570 out_err: 571 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname, 572 xprt->address_strings[RPC_DISPLAY_ADDR]); 573 574 return -EINVAL; 575 } 576 577 /** 578 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner 579 * 580 * @new: nfs_client with client ID to test 581 * @result: OUT: found nfs_client, or new 582 * @cred: credential to use for trunking test 583 * 584 * Returns zero, a negative errno, or a negative NFS4ERR status. 585 * If zero is returned, an nfs_client pointer is planted in "result." 586 * 587 * NB: nfs41_walk_client_list() relies on the new nfs_client being 588 * the last nfs_client on the list. 589 */ 590 int nfs41_walk_client_list(struct nfs_client *new, 591 struct nfs_client **result, 592 const struct cred *cred) 593 { 594 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id); 595 struct nfs_client *pos, *prev = NULL; 596 int status = -NFS4ERR_STALE_CLIENTID; 597 598 spin_lock(&nn->nfs_client_lock); 599 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) { 600 601 if (pos == new) 602 goto found; 603 604 status = nfs4_match_client(pos, new, &prev, nn); 605 if (status < 0) 606 goto out; 607 if (status != 0) 608 continue; 609 610 /* 611 * Note that session trunking is just a special subcase of 612 * client id trunking. In either case, we want to fall back 613 * to using the existing nfs_client. 614 */ 615 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner, 616 new->cl_serverowner)) 617 continue; 618 619 found: 620 refcount_inc(&pos->cl_count); 621 *result = pos; 622 status = 0; 623 break; 624 } 625 626 out: 627 spin_unlock(&nn->nfs_client_lock); 628 nfs_put_client(prev); 629 return status; 630 } 631 632 static void nfs4_destroy_server(struct nfs_server *server) 633 { 634 LIST_HEAD(freeme); 635 636 nfs_server_return_all_delegations(server); 637 unset_pnfs_layoutdriver(server); 638 nfs4_purge_state_owners(server, &freeme); 639 nfs4_free_state_owners(&freeme); 640 kfree(server->delegation_hash_table); 641 } 642 643 /* 644 * NFSv4.0 callback thread helper 645 * 646 * Find a client by callback identifier 647 */ 648 struct nfs_client * 649 nfs4_find_client_ident(struct net *net, int cb_ident) 650 { 651 struct nfs_client *clp; 652 struct nfs_net *nn = net_generic(net, nfs_net_id); 653 654 spin_lock(&nn->nfs_client_lock); 655 clp = idr_find(&nn->cb_ident_idr, cb_ident); 656 if (clp) 657 refcount_inc(&clp->cl_count); 658 spin_unlock(&nn->nfs_client_lock); 659 return clp; 660 } 661 662 /* Common match routine for v4.0 and v4.1 callback services */ 663 static bool nfs4_cb_match_client(const struct sockaddr *addr, 664 struct nfs_client *clp, u32 minorversion) 665 { 666 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; 667 668 /* Don't match clients that failed to initialise */ 669 if (!(clp->cl_cons_state == NFS_CS_READY || 670 clp->cl_cons_state == NFS_CS_SESSION_INITING)) 671 return false; 672 673 smp_rmb(); 674 675 /* Match the version and minorversion */ 676 if (clp->rpc_ops->version != 4 || 677 clp->cl_minorversion != minorversion) 678 return false; 679 680 /* Match only the IP address, not the port number */ 681 return rpc_cmp_addr(addr, clap); 682 } 683 684 /* 685 * NFSv4.1 callback thread helper 686 * For CB_COMPOUND calls, find a client by IP address, protocol version, 687 * minorversion, and sessionID 688 * 689 * Returns NULL if no such client 690 */ 691 struct nfs_client * 692 nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, 693 struct nfs4_sessionid *sid, u32 minorversion) 694 { 695 struct nfs_client *clp; 696 struct nfs_net *nn = net_generic(net, nfs_net_id); 697 698 spin_lock(&nn->nfs_client_lock); 699 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { 700 if (!nfs4_cb_match_client(addr, clp, minorversion)) 701 continue; 702 703 if (!nfs4_has_session(clp)) 704 continue; 705 706 /* Match sessionid*/ 707 if (memcmp(clp->cl_session->sess_id.data, 708 sid->data, NFS4_MAX_SESSIONID_LEN) != 0) 709 continue; 710 711 refcount_inc(&clp->cl_count); 712 spin_unlock(&nn->nfs_client_lock); 713 return clp; 714 } 715 spin_unlock(&nn->nfs_client_lock); 716 return NULL; 717 } 718 719 /* 720 * Set up an NFS4 client 721 */ 722 static int nfs4_set_client(struct nfs_server *server, 723 struct nfs_client_initdata *cl_init) 724 { 725 struct nfs_client *clp; 726 727 cl_init->nfs_mod = &nfs_v4; 728 cl_init->cred = server->cred; 729 730 if (cl_init->minorversion == 0) { 731 __set_bit(NFS_CS_REUSEPORT, &cl_init->init_flags); 732 cl_init->max_connect = 0; 733 } 734 735 switch (cl_init->proto) { 736 case XPRT_TRANSPORT_RDMA: 737 case XPRT_TRANSPORT_TCP: 738 case XPRT_TRANSPORT_TCP_TLS: 739 break; 740 default: 741 cl_init->nconnect = 0; 742 } 743 744 if (server->flags & NFS_MOUNT_NORESVPORT) 745 __set_bit(NFS_CS_NORESVPORT, &cl_init->init_flags); 746 if (server->options & NFS_OPTION_MIGRATION) 747 __set_bit(NFS_CS_MIGRATION, &cl_init->init_flags); 748 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status)) 749 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init->init_flags); 750 server->port = rpc_get_port((struct sockaddr *)cl_init->addr); 751 752 if (server->flags & NFS_MOUNT_NETUNREACH_FATAL) 753 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init->init_flags); 754 755 /* Allocate or find a client reference we can use */ 756 clp = nfs_get_client(cl_init); 757 if (IS_ERR(clp)) 758 return PTR_ERR(clp); 759 760 if (server->nfs_client == clp) { 761 nfs_put_client(clp); 762 return -ELOOP; 763 } 764 765 /* 766 * Query for the lease time on clientid setup or renewal 767 * 768 * Note that this will be set on nfs_clients that were created 769 * only for the DS role and did not set this bit, but now will 770 * serve a dual role. 771 */ 772 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); 773 774 server->nfs_client = clp; 775 nfs_sysfs_add_server(server); 776 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state"); 777 778 return 0; 779 } 780 781 /* 782 * Set up a pNFS Data Server client. 783 * 784 * Return any existing nfs_client that matches server address,port,version 785 * and minorversion. 786 * 787 * For a new nfs_client, use a soft mount (default), a low retrans and a 788 * low timeout interval so that if a connection is lost, we retry through 789 * the MDS. 790 */ 791 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv, 792 const struct sockaddr_storage *ds_addr, int ds_addrlen, 793 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans, 794 u32 minor_version) 795 { 796 struct rpc_timeout ds_timeout; 797 struct nfs_client *mds_clp = mds_srv->nfs_client; 798 struct nfs_client_initdata cl_init = { 799 .addr = ds_addr, 800 .addrlen = ds_addrlen, 801 .nodename = mds_clp->cl_rpcclient->cl_nodename, 802 .ip_addr = mds_clp->cl_ipaddr, 803 .nfs_mod = &nfs_v4, 804 .proto = ds_proto, 805 .minorversion = minor_version, 806 .net = mds_clp->cl_net, 807 .timeparms = &ds_timeout, 808 .cred = mds_srv->cred, 809 .xprtsec = { 810 .policy = RPC_XPRTSEC_NONE, 811 .cert_serial = TLS_NO_CERT, 812 .privkey_serial = TLS_NO_PRIVKEY, 813 }, 814 }; 815 char buf[INET6_ADDRSTRLEN + 1]; 816 817 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0) 818 return ERR_PTR(-EINVAL); 819 cl_init.hostname = buf; 820 821 switch (ds_proto) { 822 case XPRT_TRANSPORT_TCP_TLS: 823 if (mds_srv->nfs_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) 824 cl_init.xprtsec = mds_srv->nfs_client->cl_xprtsec; 825 else 826 ds_proto = XPRT_TRANSPORT_TCP; 827 fallthrough; 828 case XPRT_TRANSPORT_RDMA: 829 case XPRT_TRANSPORT_TCP: 830 if (mds_clp->cl_nconnect > 1) { 831 cl_init.nconnect = mds_clp->cl_nconnect; 832 cl_init.max_connect = NFS_MAX_TRANSPORTS; 833 } 834 } 835 836 if (mds_srv->flags & NFS_MOUNT_NORESVPORT) 837 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); 838 if (test_bit(NFS_CS_NETUNREACH_FATAL, &mds_clp->cl_flags)) 839 __set_bit(NFS_CS_NETUNREACH_FATAL, &cl_init.init_flags); 840 841 __set_bit(NFS_CS_PNFS, &cl_init.init_flags); 842 cl_init.max_connect = NFS_MAX_TRANSPORTS; 843 /* 844 * Set an authflavor equual to the MDS value. Use the MDS nfs_client 845 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS 846 * (section 13.1 RFC 5661). 847 */ 848 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); 849 return nfs_get_client(&cl_init); 850 } 851 EXPORT_SYMBOL_GPL(nfs4_set_ds_client); 852 853 /* 854 * Session has been established, and the client marked ready. 855 * Limit the mount rsize, wsize and dtsize using negotiated fore 856 * channel attributes. 857 */ 858 static void nfs4_session_limit_rwsize(struct nfs_server *server) 859 { 860 struct nfs4_session *sess; 861 u32 server_resp_sz; 862 u32 server_rqst_sz; 863 864 if (!nfs4_has_session(server->nfs_client)) 865 return; 866 sess = server->nfs_client->cl_session; 867 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; 868 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; 869 870 if (server->dtsize > server_resp_sz) 871 server->dtsize = server_resp_sz; 872 if (server->rsize > server_resp_sz) 873 server->rsize = server_resp_sz; 874 if (server->wsize > server_rqst_sz) 875 server->wsize = server_rqst_sz; 876 } 877 878 /* 879 * Limit xattr sizes using the channel attributes. 880 */ 881 static void nfs4_session_limit_xasize(struct nfs_server *server) 882 { 883 #ifdef CONFIG_NFS_V4_2 884 struct nfs4_session *sess; 885 u32 server_gxa_sz; 886 u32 server_sxa_sz; 887 u32 server_lxa_sz; 888 889 if (!nfs4_has_session(server->nfs_client)) 890 return; 891 892 sess = server->nfs_client->cl_session; 893 894 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead; 895 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead; 896 server_lxa_sz = sess->fc_attrs.max_resp_sz - 897 nfs42_maxlistxattrs_overhead; 898 899 if (server->gxasize > server_gxa_sz) 900 server->gxasize = server_gxa_sz; 901 if (server->sxasize > server_sxa_sz) 902 server->sxasize = server_sxa_sz; 903 if (server->lxasize > server_lxa_sz) 904 server->lxasize = server_lxa_sz; 905 #endif 906 } 907 908 static int nfs4_server_common_setup(struct nfs_server *server, 909 struct nfs_fh *mntfh, bool auth_probe) 910 { 911 int error; 912 913 error = nfs4_delegation_hash_alloc(server); 914 if (error) 915 return error; 916 917 /* data servers support only a subset of NFSv4.1 */ 918 if (is_ds_only_client(server->nfs_client)) 919 return -EPROTONOSUPPORT; 920 921 /* We must ensure the session is initialised first */ 922 error = nfs4_init_session(server->nfs_client); 923 if (error < 0) 924 return error; 925 926 nfs_server_set_init_caps(server); 927 928 /* Probe the root fh to retrieve its FSID and filehandle */ 929 error = nfs4_get_rootfh(server, mntfh, auth_probe); 930 if (error < 0) 931 return error; 932 933 dprintk("Server FSID: %llx:%llx\n", 934 (unsigned long long) server->fsid.major, 935 (unsigned long long) server->fsid.minor); 936 nfs_display_fhandle(mntfh, "Pseudo-fs root FH"); 937 938 error = nfs_probe_server(server, mntfh); 939 if (error < 0) 940 return error; 941 942 nfs4_session_limit_rwsize(server); 943 nfs4_session_limit_xasize(server); 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 return 0; 952 } 953 954 /* 955 * Create a version 4 volume record 956 */ 957 static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc) 958 { 959 struct nfs_fs_context *ctx = nfs_fc2context(fc); 960 struct rpc_timeout timeparms; 961 struct nfs_client_initdata cl_init = { 962 .hostname = ctx->nfs_server.hostname, 963 .addr = &ctx->nfs_server._address, 964 .addrlen = ctx->nfs_server.addrlen, 965 .ip_addr = ctx->client_address, 966 .proto = ctx->nfs_server.protocol, 967 .minorversion = ctx->minorversion, 968 .net = fc->net_ns, 969 .timeparms = &timeparms, 970 .xprtsec = ctx->xprtsec, 971 .nconnect = ctx->nfs_server.nconnect, 972 .max_connect = ctx->nfs_server.max_connect, 973 }; 974 int error; 975 976 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol, 977 ctx->timeo, ctx->retrans); 978 979 /* Initialise the client representation from the mount data */ 980 server->flags = ctx->flags; 981 server->options = ctx->options; 982 server->auth_info = ctx->auth_info; 983 984 /* Use the first specified auth flavor. If this flavor isn't 985 * allowed by the server, use the SECINFO path to try the 986 * other specified flavors */ 987 if (ctx->auth_info.flavor_len >= 1) 988 ctx->selected_flavor = ctx->auth_info.flavors[0]; 989 else 990 ctx->selected_flavor = RPC_AUTH_UNIX; 991 992 /* Get a client record */ 993 error = nfs4_set_client(server, &cl_init); 994 if (error < 0) 995 return error; 996 997 if (ctx->bsize) { 998 server->bsize = ctx->bsize; 999 server->automount_inherit |= NFS_AUTOMOUNT_INHERIT_BSIZE; 1000 } 1001 if (ctx->rsize) { 1002 server->rsize = 1003 nfs_io_size(ctx->rsize, server->nfs_client->cl_proto); 1004 server->automount_inherit |= NFS_AUTOMOUNT_INHERIT_RSIZE; 1005 } 1006 if (ctx->wsize) { 1007 server->wsize = 1008 nfs_io_size(ctx->wsize, server->nfs_client->cl_proto); 1009 server->automount_inherit |= NFS_AUTOMOUNT_INHERIT_WSIZE; 1010 } 1011 1012 server->acregmin = ctx->acregmin * HZ; 1013 server->acregmax = ctx->acregmax * HZ; 1014 server->acdirmin = ctx->acdirmin * HZ; 1015 server->acdirmax = ctx->acdirmax * HZ; 1016 server->port = ctx->nfs_server.port; 1017 1018 return nfs_init_server_rpcclient(server, &timeparms, 1019 ctx->selected_flavor); 1020 } 1021 1022 /* 1023 * Create a version 4 volume record 1024 * - keyed on server and FSID 1025 */ 1026 struct nfs_server *nfs4_create_server(struct fs_context *fc) 1027 { 1028 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1029 struct nfs_server *server; 1030 bool auth_probe; 1031 int error; 1032 1033 server = nfs_alloc_server(); 1034 if (!server) 1035 return ERR_PTR(-ENOMEM); 1036 1037 server->cred = get_cred(fc->cred); 1038 1039 auth_probe = ctx->auth_info.flavor_len < 1; 1040 1041 /* set up the general RPC client */ 1042 error = nfs4_init_server(server, fc); 1043 if (error < 0) 1044 goto error; 1045 1046 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1047 if (error < 0) 1048 goto error; 1049 1050 return server; 1051 1052 error: 1053 nfs_free_server(server); 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 fs_context *fc) 1061 { 1062 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1063 struct nfs_server *parent_server = NFS_SB(ctx->clone_data.sb); 1064 struct nfs_client *parent_client = parent_server->nfs_client; 1065 struct nfs_client_initdata cl_init = { 1066 .hostname = ctx->nfs_server.hostname, 1067 .addr = &ctx->nfs_server._address, 1068 .addrlen = ctx->nfs_server.addrlen, 1069 .ip_addr = parent_client->cl_ipaddr, 1070 .minorversion = parent_client->cl_mvops->minor_version, 1071 .net = parent_client->cl_net, 1072 .timeparms = parent_server->client->cl_timeout, 1073 .xprtsec = parent_client->cl_xprtsec, 1074 .nconnect = parent_client->cl_nconnect, 1075 .max_connect = parent_client->cl_max_connect, 1076 }; 1077 struct nfs_server *server; 1078 bool auth_probe; 1079 int error; 1080 1081 server = nfs_alloc_server(); 1082 if (!server) 1083 return ERR_PTR(-ENOMEM); 1084 1085 server->cred = get_cred(parent_server->cred); 1086 1087 /* Initialise the client representation from the parent server */ 1088 nfs_server_copy_userdata(server, parent_server); 1089 1090 /* Get a client representation */ 1091 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1092 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT); 1093 cl_init.proto = XPRT_TRANSPORT_RDMA; 1094 error = nfs4_set_client(server, &cl_init); 1095 if (!error) 1096 goto init_server; 1097 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */ 1098 1099 cl_init.proto = XPRT_TRANSPORT_TCP; 1100 if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE) 1101 cl_init.proto = XPRT_TRANSPORT_TCP_TLS; 1102 rpc_set_port(&ctx->nfs_server.address, NFS_PORT); 1103 error = nfs4_set_client(server, &cl_init); 1104 if (error < 0) 1105 goto error; 1106 1107 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) 1108 init_server: 1109 #endif 1110 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, 1111 ctx->selected_flavor); 1112 if (error < 0) 1113 goto error; 1114 1115 auth_probe = parent_server->auth_info.flavor_len < 1; 1116 1117 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe); 1118 if (error < 0) 1119 goto error; 1120 1121 return server; 1122 1123 error: 1124 nfs_free_server(server); 1125 return ERR_PTR(error); 1126 } 1127 1128 /** 1129 * nfs4_update_server - Move an nfs_server to a different nfs_client 1130 * 1131 * @server: represents FSID to be moved 1132 * @hostname: new end-point's hostname 1133 * @sap: new end-point's socket address 1134 * @salen: size of "sap" 1135 * @net: net namespace 1136 * 1137 * The nfs_server must be quiescent before this function is invoked. 1138 * Either its session is drained (NFSv4.1+), or its transport is 1139 * plugged and drained (NFSv4.0). 1140 * 1141 * Returns zero on success, or a negative errno value. 1142 */ 1143 int nfs4_update_server(struct nfs_server *server, const char *hostname, 1144 struct sockaddr_storage *sap, size_t salen, struct net *net) 1145 { 1146 struct nfs_client *clp = server->nfs_client; 1147 struct rpc_clnt *clnt = server->client; 1148 struct xprt_create xargs = { 1149 .ident = clp->cl_proto, 1150 .net = net, 1151 .dstaddr = (struct sockaddr *)sap, 1152 .addrlen = salen, 1153 .servername = hostname, 1154 /* cel: bleh. We might need to pass TLS parameters here */ 1155 }; 1156 char buf[INET6_ADDRSTRLEN + 1]; 1157 struct sockaddr_storage address; 1158 struct sockaddr *localaddr = (struct sockaddr *)&address; 1159 struct nfs_client_initdata cl_init = { 1160 .hostname = hostname, 1161 .addr = sap, 1162 .addrlen = salen, 1163 .ip_addr = buf, 1164 .proto = clp->cl_proto, 1165 .minorversion = clp->cl_minorversion, 1166 .net = net, 1167 .timeparms = clnt->cl_timeout, 1168 .xprtsec = clp->cl_xprtsec, 1169 .nconnect = clp->cl_nconnect, 1170 .max_connect = clp->cl_max_connect, 1171 }; 1172 int error; 1173 1174 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout); 1175 if (error != 0) 1176 return error; 1177 1178 error = rpc_localaddr(clnt, localaddr, sizeof(address)); 1179 if (error != 0) 1180 return error; 1181 1182 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0) 1183 return -EAFNOSUPPORT; 1184 1185 nfs_server_remove_lists(server); 1186 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1187 error = nfs4_set_client(server, &cl_init); 1188 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status); 1189 if (error != 0) { 1190 nfs_server_insert_lists(server); 1191 return error; 1192 } 1193 nfs_put_client(clp); 1194 1195 if (server->nfs_client->cl_hostname == NULL) { 1196 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL); 1197 if (server->nfs_client->cl_hostname == NULL) 1198 return -ENOMEM; 1199 } 1200 nfs_server_insert_lists(server); 1201 1202 return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root))); 1203 } 1204