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1/*
2 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
3 * Written by David Howells (dhowells@redhat.com)
4 */
5#include <linux/module.h>
6#include <linux/nfs_fs.h>
7#include <linux/nfs_mount.h>
8#include <linux/sunrpc/addr.h>
9#include <linux/sunrpc/auth.h>
10#include <linux/sunrpc/xprt.h>
11#include <linux/sunrpc/bc_xprt.h>
12#include <linux/sunrpc/rpc_pipe_fs.h>
13#include "internal.h"
14#include "callback.h"
15#include "delegation.h"
16#include "nfs4session.h"
17#include "nfs4idmap.h"
18#include "pnfs.h"
19#include "netns.h"
20
21#define NFSDBG_FACILITY NFSDBG_CLIENT
22
23/*
24 * Get a unique NFSv4.0 callback identifier which will be used
25 * by the V4.0 callback service to lookup the nfs_client struct
26 */
27static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
28{
29 int ret = 0;
30 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
31
32 if (clp->rpc_ops->version != 4 || minorversion != 0)
33 return ret;
34 idr_preload(GFP_KERNEL);
35 spin_lock(&nn->nfs_client_lock);
36 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
37 if (ret >= 0)
38 clp->cl_cb_ident = ret;
39 spin_unlock(&nn->nfs_client_lock);
40 idr_preload_end();
41 return ret < 0 ? ret : 0;
42}
43
44#ifdef CONFIG_NFS_V4_1
45/**
46 * Per auth flavor data server rpc clients
47 */
48struct 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 */
56static struct nfs4_ds_server *
57nfs4_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;
68out:
69 rcu_read_unlock();
70 return dss;
71}
72
73static struct nfs4_ds_server *
74nfs4_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;
88out:
89 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
90 return dss;
91}
92
93static struct nfs4_ds_server *
94nfs4_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
113static void
114nfs4_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*/
124struct rpc_clnt *
125nfs4_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);
139out:
140 return dss->rpc_clnt;
141}
142EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
143
144static void
145nfs4_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
159void 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
170void 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
178struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
179{
180 int err;
181 struct nfs_client *clp = nfs_alloc_client(cl_init);
182 if (IS_ERR(clp))
183 return clp;
184
185 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
186 if (err)
187 goto error;
188
189 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
190 err = -EINVAL;
191 goto error;
192 }
193
194 spin_lock_init(&clp->cl_lock);
195 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
196 INIT_LIST_HEAD(&clp->cl_ds_clients);
197 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
198 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
199 clp->cl_minorversion = cl_init->minorversion;
200 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
201 clp->cl_mig_gen = 1;
202#if IS_ENABLED(CONFIG_NFS_V4_1)
203 init_waitqueue_head(&clp->cl_lock_waitq);
204#endif
205 return clp;
206
207error:
208 nfs_free_client(clp);
209 return ERR_PTR(err);
210}
211
212/*
213 * Destroy the NFS4 callback service
214 */
215static void nfs4_destroy_callback(struct nfs_client *clp)
216{
217 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
218 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
219}
220
221static void nfs4_shutdown_client(struct nfs_client *clp)
222{
223 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
224 nfs4_kill_renewd(clp);
225 clp->cl_mvops->shutdown_client(clp);
226 nfs4_destroy_callback(clp);
227 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
228 nfs_idmap_delete(clp);
229
230 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
231 kfree(clp->cl_serverowner);
232 kfree(clp->cl_serverscope);
233 kfree(clp->cl_implid);
234 kfree(clp->cl_owner_id);
235}
236
237void nfs4_free_client(struct nfs_client *clp)
238{
239 nfs4_shutdown_client(clp);
240 nfs_free_client(clp);
241}
242
243/*
244 * Initialize the NFS4 callback service
245 */
246static int nfs4_init_callback(struct nfs_client *clp)
247{
248 struct rpc_xprt *xprt;
249 int error;
250
251 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
252
253 if (nfs4_has_session(clp)) {
254 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
255 if (error < 0)
256 return error;
257 }
258
259 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
260 if (error < 0) {
261 dprintk("%s: failed to start callback. Error = %d\n",
262 __func__, error);
263 return error;
264 }
265 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
266
267 return 0;
268}
269
270/**
271 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
272 * @clp - nfs_client to initialize
273 *
274 * Returns zero on success, or a negative errno if some error occurred.
275 */
276int nfs40_init_client(struct nfs_client *clp)
277{
278 struct nfs4_slot_table *tbl;
279 int ret;
280
281 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
282 if (tbl == NULL)
283 return -ENOMEM;
284
285 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
286 "NFSv4.0 transport Slot table");
287 if (ret) {
288 kfree(tbl);
289 return ret;
290 }
291
292 clp->cl_slot_tbl = tbl;
293 return 0;
294}
295
296#if defined(CONFIG_NFS_V4_1)
297
298/**
299 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
300 * @clp - nfs_client to initialize
301 *
302 * Returns zero on success, or a negative errno if some error occurred.
303 */
304int nfs41_init_client(struct nfs_client *clp)
305{
306 struct nfs4_session *session = NULL;
307
308 /*
309 * Create the session and mark it expired.
310 * When a SEQUENCE operation encounters the expired session
311 * it will do session recovery to initialize it.
312 */
313 session = nfs4_alloc_session(clp);
314 if (!session)
315 return -ENOMEM;
316
317 clp->cl_session = session;
318
319 /*
320 * The create session reply races with the server back
321 * channel probe. Mark the client NFS_CS_SESSION_INITING
322 * so that the client back channel can find the
323 * nfs_client struct
324 */
325 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
326 return 0;
327}
328
329#endif /* CONFIG_NFS_V4_1 */
330
331/*
332 * Initialize the minor version specific parts of an NFS4 client record
333 */
334static int nfs4_init_client_minor_version(struct nfs_client *clp)
335{
336 int ret;
337
338 ret = clp->cl_mvops->init_client(clp);
339 if (ret)
340 return ret;
341 return nfs4_init_callback(clp);
342}
343
344/**
345 * nfs4_init_client - Initialise an NFS4 client record
346 *
347 * @clp: nfs_client to initialise
348 * @timeparms: timeout parameters for underlying RPC transport
349 * @ip_addr: callback IP address in presentation format
350 * @authflavor: authentication flavor for underlying RPC transport
351 *
352 * Returns pointer to an NFS client, or an ERR_PTR value.
353 */
354struct nfs_client *nfs4_init_client(struct nfs_client *clp,
355 const struct nfs_client_initdata *cl_init)
356{
357 char buf[INET6_ADDRSTRLEN + 1];
358 const char *ip_addr = cl_init->ip_addr;
359 struct nfs_client *old;
360 int error;
361
362 if (clp->cl_cons_state == NFS_CS_READY)
363 /* the client is initialised already */
364 return clp;
365
366 /* Check NFS protocol revision and initialize RPC op vector */
367 clp->rpc_ops = &nfs_v4_clientops;
368
369 if (clp->cl_minorversion != 0)
370 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
371 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
372 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
373
374 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
375 if (error == -EINVAL)
376 error = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
377 if (error < 0)
378 goto error;
379
380 /* If no clientaddr= option was specified, find a usable cb address */
381 if (ip_addr == NULL) {
382 struct sockaddr_storage cb_addr;
383 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
384
385 error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
386 if (error < 0)
387 goto error;
388 error = rpc_ntop(sap, buf, sizeof(buf));
389 if (error < 0)
390 goto error;
391 ip_addr = (const char *)buf;
392 }
393 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
394
395 error = nfs_idmap_new(clp);
396 if (error < 0) {
397 dprintk("%s: failed to create idmapper. Error = %d\n",
398 __func__, error);
399 goto error;
400 }
401 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
402
403 error = nfs4_init_client_minor_version(clp);
404 if (error < 0)
405 goto error;
406
407 error = nfs4_discover_server_trunking(clp, &old);
408 if (error < 0)
409 goto error;
410
411 if (clp != old) {
412 clp->cl_preserve_clid = true;
413 /*
414 * Mark the client as having failed initialization so other
415 * processes walking the nfs_client_list in nfs_match_client()
416 * won't try to use it.
417 */
418 nfs_mark_client_ready(clp, -EPERM);
419 }
420 nfs_put_client(clp);
421 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
422 return old;
423
424error:
425 nfs_mark_client_ready(clp, error);
426 nfs_put_client(clp);
427 return ERR_PTR(error);
428}
429
430/*
431 * SETCLIENTID just did a callback update with the callback ident in
432 * "drop," but server trunking discovery claims "drop" and "keep" are
433 * actually the same server. Swap the callback IDs so that "keep"
434 * will continue to use the callback ident the server now knows about,
435 * and so that "keep"'s original callback ident is destroyed when
436 * "drop" is freed.
437 */
438static void nfs4_swap_callback_idents(struct nfs_client *keep,
439 struct nfs_client *drop)
440{
441 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
442 unsigned int save = keep->cl_cb_ident;
443
444 if (keep->cl_cb_ident == drop->cl_cb_ident)
445 return;
446
447 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
448 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
449
450 spin_lock(&nn->nfs_client_lock);
451
452 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
453 keep->cl_cb_ident = drop->cl_cb_ident;
454
455 idr_replace(&nn->cb_ident_idr, drop, save);
456 drop->cl_cb_ident = save;
457
458 spin_unlock(&nn->nfs_client_lock);
459}
460
461static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
462 const struct nfs_client *clp2)
463{
464 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
465 return true;
466 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
467}
468
469static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
470{
471 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
472}
473
474static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
475 struct nfs_client **prev, struct nfs_net *nn)
476{
477 int status;
478
479 if (pos->rpc_ops != new->rpc_ops)
480 return 1;
481
482 if (pos->cl_minorversion != new->cl_minorversion)
483 return 1;
484
485 /* If "pos" isn't marked ready, we can't trust the
486 * remaining fields in "pos", especially the client
487 * ID and serverowner fields. Wait for CREATE_SESSION
488 * to finish. */
489 if (pos->cl_cons_state > NFS_CS_READY) {
490 refcount_inc(&pos->cl_count);
491 spin_unlock(&nn->nfs_client_lock);
492
493 nfs_put_client(*prev);
494 *prev = pos;
495
496 status = nfs_wait_client_init_complete(pos);
497 spin_lock(&nn->nfs_client_lock);
498
499 if (status < 0)
500 return status;
501 }
502
503 if (pos->cl_cons_state != NFS_CS_READY)
504 return 1;
505
506 if (pos->cl_clientid != new->cl_clientid)
507 return 1;
508
509 /* NFSv4.1 always uses the uniform string, however someone
510 * might switch the uniquifier string on us.
511 */
512 if (!nfs4_match_client_owner_id(pos, new))
513 return 1;
514
515 return 0;
516}
517
518/**
519 * nfs40_walk_client_list - Find server that recognizes a client ID
520 *
521 * @new: nfs_client with client ID to test
522 * @result: OUT: found nfs_client, or new
523 * @cred: credential to use for trunking test
524 *
525 * Returns zero, a negative errno, or a negative NFS4ERR status.
526 * If zero is returned, an nfs_client pointer is planted in "result."
527 *
528 * NB: nfs40_walk_client_list() relies on the new nfs_client being
529 * the last nfs_client on the list.
530 */
531int nfs40_walk_client_list(struct nfs_client *new,
532 struct nfs_client **result,
533 struct rpc_cred *cred)
534{
535 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
536 struct nfs_client *pos, *prev = NULL;
537 struct nfs4_setclientid_res clid = {
538 .clientid = new->cl_clientid,
539 .confirm = new->cl_confirm,
540 };
541 int status = -NFS4ERR_STALE_CLIENTID;
542
543 spin_lock(&nn->nfs_client_lock);
544 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
545
546 if (pos == new)
547 goto found;
548
549 status = nfs4_match_client(pos, new, &prev, nn);
550 if (status < 0)
551 goto out_unlock;
552 if (status != 0)
553 continue;
554 /*
555 * We just sent a new SETCLIENTID, which should have
556 * caused the server to return a new cl_confirm. So if
557 * cl_confirm is the same, then this is a different
558 * server that just returned the same cl_confirm by
559 * coincidence:
560 */
561 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
562 &new->cl_confirm))
563 continue;
564 /*
565 * But if the cl_confirm's are different, then the only
566 * way that a SETCLIENTID_CONFIRM to pos can succeed is
567 * if new and pos point to the same server:
568 */
569found:
570 refcount_inc(&pos->cl_count);
571 spin_unlock(&nn->nfs_client_lock);
572
573 nfs_put_client(prev);
574 prev = pos;
575
576 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
577 switch (status) {
578 case -NFS4ERR_STALE_CLIENTID:
579 break;
580 case 0:
581 nfs4_swap_callback_idents(pos, new);
582 pos->cl_confirm = new->cl_confirm;
583 nfs_mark_client_ready(pos, NFS_CS_READY);
584
585 prev = NULL;
586 *result = pos;
587 goto out;
588 case -ERESTARTSYS:
589 case -ETIMEDOUT:
590 /* The callback path may have been inadvertently
591 * changed. Schedule recovery!
592 */
593 nfs4_schedule_path_down_recovery(pos);
594 default:
595 goto out;
596 }
597
598 spin_lock(&nn->nfs_client_lock);
599 }
600out_unlock:
601 spin_unlock(&nn->nfs_client_lock);
602
603 /* No match found. The server lost our clientid */
604out:
605 nfs_put_client(prev);
606 return status;
607}
608
609#ifdef CONFIG_NFS_V4_1
610/*
611 * Returns true if the server major ids match
612 */
613static bool
614nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
615 struct nfs41_server_owner *o2)
616{
617 if (o1->major_id_sz != o2->major_id_sz)
618 return false;
619 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
620}
621
622/*
623 * Returns true if the server scopes match
624 */
625static bool
626nfs4_check_server_scope(struct nfs41_server_scope *s1,
627 struct nfs41_server_scope *s2)
628{
629 if (s1->server_scope_sz != s2->server_scope_sz)
630 return false;
631 return memcmp(s1->server_scope, s2->server_scope,
632 s1->server_scope_sz) == 0;
633}
634
635/**
636 * nfs4_detect_session_trunking - Checks for session trunking.
637 *
638 * Called after a successful EXCHANGE_ID on a multi-addr connection.
639 * Upon success, add the transport.
640 *
641 * @clp: original mount nfs_client
642 * @res: result structure from an exchange_id using the original mount
643 * nfs_client with a new multi_addr transport
644 *
645 * Returns zero on success, otherwise -EINVAL
646 *
647 * Note: since the exchange_id for the new multi_addr transport uses the
648 * same nfs_client from the original mount, the cl_owner_id is reused,
649 * so eir_clientowner is the same.
650 */
651int nfs4_detect_session_trunking(struct nfs_client *clp,
652 struct nfs41_exchange_id_res *res,
653 struct rpc_xprt *xprt)
654{
655 /* Check eir_clientid */
656 if (clp->cl_clientid != res->clientid)
657 goto out_err;
658
659 /* Check eir_server_owner so_major_id */
660 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
661 res->server_owner))
662 goto out_err;
663
664 /* Check eir_server_owner so_minor_id */
665 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
666 goto out_err;
667
668 /* Check eir_server_scope */
669 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
670 goto out_err;
671
672 pr_info("NFS: %s: Session trunking succeeded for %s\n",
673 clp->cl_hostname,
674 xprt->address_strings[RPC_DISPLAY_ADDR]);
675
676 return 0;
677out_err:
678 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
679 xprt->address_strings[RPC_DISPLAY_ADDR]);
680
681 return -EINVAL;
682}
683
684/**
685 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
686 *
687 * @new: nfs_client with client ID to test
688 * @result: OUT: found nfs_client, or new
689 * @cred: credential to use for trunking test
690 *
691 * Returns zero, a negative errno, or a negative NFS4ERR status.
692 * If zero is returned, an nfs_client pointer is planted in "result."
693 *
694 * NB: nfs41_walk_client_list() relies on the new nfs_client being
695 * the last nfs_client on the list.
696 */
697int nfs41_walk_client_list(struct nfs_client *new,
698 struct nfs_client **result,
699 struct rpc_cred *cred)
700{
701 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
702 struct nfs_client *pos, *prev = NULL;
703 int status = -NFS4ERR_STALE_CLIENTID;
704
705 spin_lock(&nn->nfs_client_lock);
706 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
707
708 if (pos == new)
709 goto found;
710
711 status = nfs4_match_client(pos, new, &prev, nn);
712 if (status < 0)
713 goto out;
714 if (status != 0)
715 continue;
716
717 /*
718 * Note that session trunking is just a special subcase of
719 * client id trunking. In either case, we want to fall back
720 * to using the existing nfs_client.
721 */
722 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
723 new->cl_serverowner))
724 continue;
725
726found:
727 refcount_inc(&pos->cl_count);
728 *result = pos;
729 status = 0;
730 break;
731 }
732
733out:
734 spin_unlock(&nn->nfs_client_lock);
735 nfs_put_client(prev);
736 return status;
737}
738#endif /* CONFIG_NFS_V4_1 */
739
740static void nfs4_destroy_server(struct nfs_server *server)
741{
742 nfs_server_return_all_delegations(server);
743 unset_pnfs_layoutdriver(server);
744 nfs4_purge_state_owners(server);
745}
746
747/*
748 * NFSv4.0 callback thread helper
749 *
750 * Find a client by callback identifier
751 */
752struct nfs_client *
753nfs4_find_client_ident(struct net *net, int cb_ident)
754{
755 struct nfs_client *clp;
756 struct nfs_net *nn = net_generic(net, nfs_net_id);
757
758 spin_lock(&nn->nfs_client_lock);
759 clp = idr_find(&nn->cb_ident_idr, cb_ident);
760 if (clp)
761 refcount_inc(&clp->cl_count);
762 spin_unlock(&nn->nfs_client_lock);
763 return clp;
764}
765
766#if defined(CONFIG_NFS_V4_1)
767/* Common match routine for v4.0 and v4.1 callback services */
768static bool nfs4_cb_match_client(const struct sockaddr *addr,
769 struct nfs_client *clp, u32 minorversion)
770{
771 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
772
773 /* Don't match clients that failed to initialise */
774 if (!(clp->cl_cons_state == NFS_CS_READY ||
775 clp->cl_cons_state == NFS_CS_SESSION_INITING))
776 return false;
777
778 smp_rmb();
779
780 /* Match the version and minorversion */
781 if (clp->rpc_ops->version != 4 ||
782 clp->cl_minorversion != minorversion)
783 return false;
784
785 /* Match only the IP address, not the port number */
786 return rpc_cmp_addr(addr, clap);
787}
788
789/*
790 * NFSv4.1 callback thread helper
791 * For CB_COMPOUND calls, find a client by IP address, protocol version,
792 * minorversion, and sessionID
793 *
794 * Returns NULL if no such client
795 */
796struct nfs_client *
797nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
798 struct nfs4_sessionid *sid, u32 minorversion)
799{
800 struct nfs_client *clp;
801 struct nfs_net *nn = net_generic(net, nfs_net_id);
802
803 spin_lock(&nn->nfs_client_lock);
804 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
805 if (!nfs4_cb_match_client(addr, clp, minorversion))
806 continue;
807
808 if (!nfs4_has_session(clp))
809 continue;
810
811 /* Match sessionid*/
812 if (memcmp(clp->cl_session->sess_id.data,
813 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
814 continue;
815
816 refcount_inc(&clp->cl_count);
817 spin_unlock(&nn->nfs_client_lock);
818 return clp;
819 }
820 spin_unlock(&nn->nfs_client_lock);
821 return NULL;
822}
823
824#else /* CONFIG_NFS_V4_1 */
825
826struct nfs_client *
827nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
828 struct nfs4_sessionid *sid, u32 minorversion)
829{
830 return NULL;
831}
832#endif /* CONFIG_NFS_V4_1 */
833
834/*
835 * Set up an NFS4 client
836 */
837static int nfs4_set_client(struct nfs_server *server,
838 const char *hostname,
839 const struct sockaddr *addr,
840 const size_t addrlen,
841 const char *ip_addr,
842 int proto, const struct rpc_timeout *timeparms,
843 u32 minorversion, struct net *net)
844{
845 struct nfs_client_initdata cl_init = {
846 .hostname = hostname,
847 .addr = addr,
848 .addrlen = addrlen,
849 .ip_addr = ip_addr,
850 .nfs_mod = &nfs_v4,
851 .proto = proto,
852 .minorversion = minorversion,
853 .net = net,
854 .timeparms = timeparms,
855 };
856 struct nfs_client *clp;
857
858 if (server->flags & NFS_MOUNT_NORESVPORT)
859 set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
860 if (server->options & NFS_OPTION_MIGRATION)
861 set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
862 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
863 set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
864 server->port = rpc_get_port(addr);
865
866 /* Allocate or find a client reference we can use */
867 clp = nfs_get_client(&cl_init);
868 if (IS_ERR(clp))
869 return PTR_ERR(clp);
870
871 if (server->nfs_client == clp) {
872 nfs_put_client(clp);
873 return -ELOOP;
874 }
875
876 /*
877 * Query for the lease time on clientid setup or renewal
878 *
879 * Note that this will be set on nfs_clients that were created
880 * only for the DS role and did not set this bit, but now will
881 * serve a dual role.
882 */
883 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
884
885 server->nfs_client = clp;
886 return 0;
887}
888
889/*
890 * Set up a pNFS Data Server client.
891 *
892 * Return any existing nfs_client that matches server address,port,version
893 * and minorversion.
894 *
895 * For a new nfs_client, use a soft mount (default), a low retrans and a
896 * low timeout interval so that if a connection is lost, we retry through
897 * the MDS.
898 */
899struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
900 const struct sockaddr *ds_addr, int ds_addrlen,
901 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
902 u32 minor_version)
903{
904 struct rpc_timeout ds_timeout;
905 struct nfs_client *mds_clp = mds_srv->nfs_client;
906 struct nfs_client_initdata cl_init = {
907 .addr = ds_addr,
908 .addrlen = ds_addrlen,
909 .nodename = mds_clp->cl_rpcclient->cl_nodename,
910 .ip_addr = mds_clp->cl_ipaddr,
911 .nfs_mod = &nfs_v4,
912 .proto = ds_proto,
913 .minorversion = minor_version,
914 .net = mds_clp->cl_net,
915 .timeparms = &ds_timeout,
916 };
917 char buf[INET6_ADDRSTRLEN + 1];
918
919 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
920 return ERR_PTR(-EINVAL);
921 cl_init.hostname = buf;
922
923 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
924 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
925
926 /*
927 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
928 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
929 * (section 13.1 RFC 5661).
930 */
931 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
932 return nfs_get_client(&cl_init);
933}
934EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
935
936/*
937 * Session has been established, and the client marked ready.
938 * Set the mount rsize and wsize with negotiated fore channel
939 * attributes which will be bound checked in nfs_server_set_fsinfo.
940 */
941static void nfs4_session_set_rwsize(struct nfs_server *server)
942{
943#ifdef CONFIG_NFS_V4_1
944 struct nfs4_session *sess;
945 u32 server_resp_sz;
946 u32 server_rqst_sz;
947
948 if (!nfs4_has_session(server->nfs_client))
949 return;
950 sess = server->nfs_client->cl_session;
951 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
952 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
953
954 if (!server->rsize || server->rsize > server_resp_sz)
955 server->rsize = server_resp_sz;
956 if (!server->wsize || server->wsize > server_rqst_sz)
957 server->wsize = server_rqst_sz;
958#endif /* CONFIG_NFS_V4_1 */
959}
960
961static int nfs4_server_common_setup(struct nfs_server *server,
962 struct nfs_fh *mntfh, bool auth_probe)
963{
964 struct nfs_fattr *fattr;
965 int error;
966
967 /* data servers support only a subset of NFSv4.1 */
968 if (is_ds_only_client(server->nfs_client))
969 return -EPROTONOSUPPORT;
970
971 fattr = nfs_alloc_fattr();
972 if (fattr == NULL)
973 return -ENOMEM;
974
975 /* We must ensure the session is initialised first */
976 error = nfs4_init_session(server->nfs_client);
977 if (error < 0)
978 goto out;
979
980 /* Set the basic capabilities */
981 server->caps |= server->nfs_client->cl_mvops->init_caps;
982 if (server->flags & NFS_MOUNT_NORDIRPLUS)
983 server->caps &= ~NFS_CAP_READDIRPLUS;
984 /*
985 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
986 * authentication.
987 */
988 if (nfs4_disable_idmapping &&
989 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
990 server->caps |= NFS_CAP_UIDGID_NOMAP;
991
992
993 /* Probe the root fh to retrieve its FSID and filehandle */
994 error = nfs4_get_rootfh(server, mntfh, auth_probe);
995 if (error < 0)
996 goto out;
997
998 dprintk("Server FSID: %llx:%llx\n",
999 (unsigned long long) server->fsid.major,
1000 (unsigned long long) server->fsid.minor);
1001 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1002
1003 nfs4_session_set_rwsize(server);
1004
1005 error = nfs_probe_fsinfo(server, mntfh, fattr);
1006 if (error < 0)
1007 goto out;
1008
1009 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1010 server->namelen = NFS4_MAXNAMLEN;
1011
1012 nfs_server_insert_lists(server);
1013 server->mount_time = jiffies;
1014 server->destroy = nfs4_destroy_server;
1015out:
1016 nfs_free_fattr(fattr);
1017 return error;
1018}
1019
1020/*
1021 * Create a version 4 volume record
1022 */
1023static int nfs4_init_server(struct nfs_server *server,
1024 struct nfs_parsed_mount_data *data)
1025{
1026 struct rpc_timeout timeparms;
1027 int error;
1028
1029 nfs_init_timeout_values(&timeparms, data->nfs_server.protocol,
1030 data->timeo, data->retrans);
1031
1032 /* Initialise the client representation from the mount data */
1033 server->flags = data->flags;
1034 server->options = data->options;
1035 server->auth_info = data->auth_info;
1036
1037 /* Use the first specified auth flavor. If this flavor isn't
1038 * allowed by the server, use the SECINFO path to try the
1039 * other specified flavors */
1040 if (data->auth_info.flavor_len >= 1)
1041 data->selected_flavor = data->auth_info.flavors[0];
1042 else
1043 data->selected_flavor = RPC_AUTH_UNIX;
1044
1045 /* Get a client record */
1046 error = nfs4_set_client(server,
1047 data->nfs_server.hostname,
1048 (const struct sockaddr *)&data->nfs_server.address,
1049 data->nfs_server.addrlen,
1050 data->client_address,
1051 data->nfs_server.protocol,
1052 &timeparms,
1053 data->minorversion,
1054 data->net);
1055 if (error < 0)
1056 return error;
1057
1058 if (data->rsize)
1059 server->rsize = nfs_block_size(data->rsize, NULL);
1060 if (data->wsize)
1061 server->wsize = nfs_block_size(data->wsize, NULL);
1062
1063 server->acregmin = data->acregmin * HZ;
1064 server->acregmax = data->acregmax * HZ;
1065 server->acdirmin = data->acdirmin * HZ;
1066 server->acdirmax = data->acdirmax * HZ;
1067 server->port = data->nfs_server.port;
1068
1069 return nfs_init_server_rpcclient(server, &timeparms,
1070 data->selected_flavor);
1071}
1072
1073/*
1074 * Create a version 4 volume record
1075 * - keyed on server and FSID
1076 */
1077/*struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
1078 struct nfs_fh *mntfh)*/
1079struct nfs_server *nfs4_create_server(struct nfs_mount_info *mount_info,
1080 struct nfs_subversion *nfs_mod)
1081{
1082 struct nfs_server *server;
1083 bool auth_probe;
1084 int error;
1085
1086 server = nfs_alloc_server();
1087 if (!server)
1088 return ERR_PTR(-ENOMEM);
1089
1090 auth_probe = mount_info->parsed->auth_info.flavor_len < 1;
1091
1092 /* set up the general RPC client */
1093 error = nfs4_init_server(server, mount_info->parsed);
1094 if (error < 0)
1095 goto error;
1096
1097 error = nfs4_server_common_setup(server, mount_info->mntfh, auth_probe);
1098 if (error < 0)
1099 goto error;
1100
1101 return server;
1102
1103error:
1104 nfs_free_server(server);
1105 return ERR_PTR(error);
1106}
1107
1108/*
1109 * Create an NFS4 referral server record
1110 */
1111struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data,
1112 struct nfs_fh *mntfh)
1113{
1114 struct nfs_client *parent_client;
1115 struct nfs_server *server, *parent_server;
1116 bool auth_probe;
1117 int error;
1118
1119 server = nfs_alloc_server();
1120 if (!server)
1121 return ERR_PTR(-ENOMEM);
1122
1123 parent_server = NFS_SB(data->sb);
1124 parent_client = parent_server->nfs_client;
1125
1126 /* Initialise the client representation from the parent server */
1127 nfs_server_copy_userdata(server, parent_server);
1128
1129 /* Get a client representation */
1130#ifdef CONFIG_SUNRPC_XPRT_RDMA
1131 rpc_set_port(data->addr, NFS_RDMA_PORT);
1132 error = nfs4_set_client(server, data->hostname,
1133 data->addr,
1134 data->addrlen,
1135 parent_client->cl_ipaddr,
1136 XPRT_TRANSPORT_RDMA,
1137 parent_server->client->cl_timeout,
1138 parent_client->cl_mvops->minor_version,
1139 parent_client->cl_net);
1140 if (!error)
1141 goto init_server;
1142#endif /* CONFIG_SUNRPC_XPRT_RDMA */
1143
1144 rpc_set_port(data->addr, NFS_PORT);
1145 error = nfs4_set_client(server, data->hostname,
1146 data->addr,
1147 data->addrlen,
1148 parent_client->cl_ipaddr,
1149 XPRT_TRANSPORT_TCP,
1150 parent_server->client->cl_timeout,
1151 parent_client->cl_mvops->minor_version,
1152 parent_client->cl_net);
1153 if (error < 0)
1154 goto error;
1155
1156#ifdef CONFIG_SUNRPC_XPRT_RDMA
1157init_server:
1158#endif
1159 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor);
1160 if (error < 0)
1161 goto error;
1162
1163 auth_probe = parent_server->auth_info.flavor_len < 1;
1164
1165 error = nfs4_server_common_setup(server, mntfh, auth_probe);
1166 if (error < 0)
1167 goto error;
1168
1169 return server;
1170
1171error:
1172 nfs_free_server(server);
1173 return ERR_PTR(error);
1174}
1175
1176/*
1177 * Grab the destination's particulars, including lease expiry time.
1178 *
1179 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1180 * we have cached.
1181 */
1182static int nfs_probe_destination(struct nfs_server *server)
1183{
1184 struct inode *inode = d_inode(server->super->s_root);
1185 struct nfs_fattr *fattr;
1186 int error;
1187
1188 fattr = nfs_alloc_fattr();
1189 if (fattr == NULL)
1190 return -ENOMEM;
1191
1192 /* Sanity: the probe won't work if the destination server
1193 * does not recognize the migrated FH. */
1194 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1195
1196 nfs_free_fattr(fattr);
1197 return error;
1198}
1199
1200/**
1201 * nfs4_update_server - Move an nfs_server to a different nfs_client
1202 *
1203 * @server: represents FSID to be moved
1204 * @hostname: new end-point's hostname
1205 * @sap: new end-point's socket address
1206 * @salen: size of "sap"
1207 * @net: net namespace
1208 *
1209 * The nfs_server must be quiescent before this function is invoked.
1210 * Either its session is drained (NFSv4.1+), or its transport is
1211 * plugged and drained (NFSv4.0).
1212 *
1213 * Returns zero on success, or a negative errno value.
1214 */
1215int nfs4_update_server(struct nfs_server *server, const char *hostname,
1216 struct sockaddr *sap, size_t salen, struct net *net)
1217{
1218 struct nfs_client *clp = server->nfs_client;
1219 struct rpc_clnt *clnt = server->client;
1220 struct xprt_create xargs = {
1221 .ident = clp->cl_proto,
1222 .net = net,
1223 .dstaddr = sap,
1224 .addrlen = salen,
1225 .servername = hostname,
1226 };
1227 char buf[INET6_ADDRSTRLEN + 1];
1228 struct sockaddr_storage address;
1229 struct sockaddr *localaddr = (struct sockaddr *)&address;
1230 int error;
1231
1232 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1233 if (error != 0)
1234 return error;
1235
1236 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1237 if (error != 0)
1238 return error;
1239
1240 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1241 return -EAFNOSUPPORT;
1242
1243 nfs_server_remove_lists(server);
1244 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1245 error = nfs4_set_client(server, hostname, sap, salen, buf,
1246 clp->cl_proto, clnt->cl_timeout,
1247 clp->cl_minorversion, net);
1248 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1249 if (error != 0) {
1250 nfs_server_insert_lists(server);
1251 return error;
1252 }
1253 nfs_put_client(clp);
1254
1255 if (server->nfs_client->cl_hostname == NULL)
1256 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1257 nfs_server_insert_lists(server);
1258
1259 return nfs_probe_destination(server);
1260}
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 "internal.h"
15#include "callback.h"
16#include "delegation.h"
17#include "nfs4session.h"
18#include "nfs4idmap.h"
19#include "pnfs.h"
20#include "netns.h"
21#include "sysfs.h"
22
23#define NFSDBG_FACILITY NFSDBG_CLIENT
24
25/*
26 * Get a unique NFSv4.0 callback identifier which will be used
27 * by the V4.0 callback service to lookup the nfs_client struct
28 */
29static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
30{
31 int ret = 0;
32 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
33
34 if (clp->rpc_ops->version != 4 || minorversion != 0)
35 return ret;
36 idr_preload(GFP_KERNEL);
37 spin_lock(&nn->nfs_client_lock);
38 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
39 if (ret >= 0)
40 clp->cl_cb_ident = ret;
41 spin_unlock(&nn->nfs_client_lock);
42 idr_preload_end();
43 return ret < 0 ? ret : 0;
44}
45
46#ifdef CONFIG_NFS_V4_1
47/*
48 * Per auth flavor data server rpc clients
49 */
50struct 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 */
60static struct nfs4_ds_server *
61nfs4_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;
72out:
73 rcu_read_unlock();
74 return dss;
75}
76
77static struct nfs4_ds_server *
78nfs4_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;
92out:
93 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
94 return dss;
95}
96
97static struct nfs4_ds_server *
98nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
99{
100 struct nfs4_ds_server *dss;
101
102 dss = kmalloc(sizeof(*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
117static void
118nfs4_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 */
132struct rpc_clnt *
133nfs4_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);
147out:
148 return dss->rpc_clnt;
149}
150EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
151
152static void
153nfs4_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
166static void
167nfs4_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
179void 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#endif /* CONFIG_NFS_V4_1 */
190
191void nfs40_shutdown_client(struct nfs_client *clp)
192{
193 if (clp->cl_slot_tbl) {
194 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
195 kfree(clp->cl_slot_tbl);
196 }
197}
198
199struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
200{
201 char buf[INET6_ADDRSTRLEN + 1];
202 const char *ip_addr = cl_init->ip_addr;
203 struct nfs_client *clp = nfs_alloc_client(cl_init);
204 int err;
205
206 if (IS_ERR(clp))
207 return clp;
208
209 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
210 if (err)
211 goto error;
212
213 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
214 err = -EINVAL;
215 goto error;
216 }
217
218 spin_lock_init(&clp->cl_lock);
219 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
220 INIT_LIST_HEAD(&clp->cl_ds_clients);
221 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
222 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
223 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
224 clp->cl_mig_gen = 1;
225#if IS_ENABLED(CONFIG_NFS_V4_1)
226 init_waitqueue_head(&clp->cl_lock_waitq);
227#endif
228 INIT_LIST_HEAD(&clp->pending_cb_stateids);
229
230 if (cl_init->minorversion != 0)
231 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
232 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
233 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
234 if (test_bit(NFS_CS_PNFS, &cl_init->init_flags))
235 __set_bit(NFS_CS_PNFS, &clp->cl_flags);
236 /*
237 * Set up the connection to the server before we add add to the
238 * global list.
239 */
240 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
241 if (err == -EINVAL)
242 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
243 if (err < 0)
244 goto error;
245
246 /* If no clientaddr= option was specified, find a usable cb address */
247 if (ip_addr == NULL) {
248 struct sockaddr_storage cb_addr;
249 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
250
251 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
252 if (err < 0)
253 goto error;
254 err = rpc_ntop(sap, buf, sizeof(buf));
255 if (err < 0)
256 goto error;
257 ip_addr = (const char *)buf;
258 }
259 strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
260
261 err = nfs_idmap_new(clp);
262 if (err < 0) {
263 dprintk("%s: failed to create idmapper. Error = %d\n",
264 __func__, err);
265 goto error;
266 }
267 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
268 return clp;
269
270error:
271 nfs_free_client(clp);
272 return ERR_PTR(err);
273}
274
275/*
276 * Destroy the NFS4 callback service
277 */
278static void nfs4_destroy_callback(struct nfs_client *clp)
279{
280 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
281 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
282}
283
284static void nfs4_shutdown_client(struct nfs_client *clp)
285{
286 if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
287 nfs4_kill_renewd(clp);
288 clp->cl_mvops->shutdown_client(clp);
289 nfs4_destroy_callback(clp);
290 if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
291 nfs_idmap_delete(clp);
292
293 rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
294 kfree(clp->cl_serverowner);
295 kfree(clp->cl_serverscope);
296 kfree(clp->cl_implid);
297 kfree(clp->cl_owner_id);
298}
299
300void nfs4_free_client(struct nfs_client *clp)
301{
302 nfs4_shutdown_client(clp);
303 nfs_free_client(clp);
304}
305
306/*
307 * Initialize the NFS4 callback service
308 */
309static int nfs4_init_callback(struct nfs_client *clp)
310{
311 struct rpc_xprt *xprt;
312 int error;
313
314 xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt);
315
316 if (nfs4_has_session(clp)) {
317 error = xprt_setup_backchannel(xprt, NFS41_BC_MIN_CALLBACKS);
318 if (error < 0)
319 return error;
320 }
321
322 error = nfs_callback_up(clp->cl_mvops->minor_version, xprt);
323 if (error < 0) {
324 dprintk("%s: failed to start callback. Error = %d\n",
325 __func__, error);
326 return error;
327 }
328 __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
329
330 return 0;
331}
332
333/**
334 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
335 * @clp: nfs_client to initialize
336 *
337 * Returns zero on success, or a negative errno if some error occurred.
338 */
339int nfs40_init_client(struct nfs_client *clp)
340{
341 struct nfs4_slot_table *tbl;
342 int ret;
343
344 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
345 if (tbl == NULL)
346 return -ENOMEM;
347
348 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
349 "NFSv4.0 transport Slot table");
350 if (ret) {
351 nfs4_shutdown_slot_table(tbl);
352 kfree(tbl);
353 return ret;
354 }
355
356 clp->cl_slot_tbl = tbl;
357 return 0;
358}
359
360#if defined(CONFIG_NFS_V4_1)
361
362/**
363 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
364 * @clp: nfs_client to initialize
365 *
366 * Returns zero on success, or a negative errno if some error occurred.
367 */
368int nfs41_init_client(struct nfs_client *clp)
369{
370 struct nfs4_session *session = NULL;
371
372 /*
373 * Create the session and mark it expired.
374 * When a SEQUENCE operation encounters the expired session
375 * it will do session recovery to initialize it.
376 */
377 session = nfs4_alloc_session(clp);
378 if (!session)
379 return -ENOMEM;
380
381 clp->cl_session = session;
382
383 /*
384 * The create session reply races with the server back
385 * channel probe. Mark the client NFS_CS_SESSION_INITING
386 * so that the client back channel can find the
387 * nfs_client struct
388 */
389 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
390 return 0;
391}
392
393#endif /* CONFIG_NFS_V4_1 */
394
395/*
396 * Initialize the minor version specific parts of an NFS4 client record
397 */
398static int nfs4_init_client_minor_version(struct nfs_client *clp)
399{
400 int ret;
401
402 ret = clp->cl_mvops->init_client(clp);
403 if (ret)
404 return ret;
405 return nfs4_init_callback(clp);
406}
407
408static void nfs4_add_trunk(struct nfs_client *clp, struct nfs_client *old)
409{
410 struct sockaddr_storage clp_addr, old_addr;
411 struct sockaddr *clp_sap = (struct sockaddr *)&clp_addr;
412 struct sockaddr *old_sap = (struct sockaddr *)&old_addr;
413 size_t clp_salen;
414 struct xprt_create xprt_args = {
415 .ident = old->cl_proto,
416 .net = old->cl_net,
417 .servername = old->cl_hostname,
418 };
419 int max_connect = test_bit(NFS_CS_PNFS, &clp->cl_flags) ?
420 clp->cl_max_connect : old->cl_max_connect;
421
422 if (clp->cl_proto != old->cl_proto)
423 return;
424 clp_salen = rpc_peeraddr(clp->cl_rpcclient, clp_sap, sizeof(clp_addr));
425 rpc_peeraddr(old->cl_rpcclient, old_sap, sizeof(old_addr));
426
427 if (clp_addr.ss_family != old_addr.ss_family)
428 return;
429
430 xprt_args.dstaddr = clp_sap;
431 xprt_args.addrlen = clp_salen;
432
433 rpc_clnt_add_xprt(old->cl_rpcclient, &xprt_args,
434 rpc_clnt_test_and_add_xprt, &max_connect);
435}
436
437/**
438 * nfs4_init_client - Initialise an NFS4 client record
439 *
440 * @clp: nfs_client to initialise
441 * @cl_init: pointer to nfs_client_initdata
442 *
443 * Returns pointer to an NFS client, or an ERR_PTR value.
444 */
445struct nfs_client *nfs4_init_client(struct nfs_client *clp,
446 const struct nfs_client_initdata *cl_init)
447{
448 struct nfs_client *old;
449 int error;
450
451 if (clp->cl_cons_state == NFS_CS_READY)
452 /* the client is initialised already */
453 return clp;
454
455 error = nfs4_init_client_minor_version(clp);
456 if (error < 0)
457 goto error;
458
459 error = nfs4_discover_server_trunking(clp, &old);
460 if (error < 0)
461 goto error;
462
463 if (clp != old) {
464 clp->cl_preserve_clid = true;
465 /*
466 * Mark the client as having failed initialization so other
467 * processes walking the nfs_client_list in nfs_match_client()
468 * won't try to use it.
469 */
470 nfs_mark_client_ready(clp, -EPERM);
471 if (old->cl_mvops->session_trunk)
472 nfs4_add_trunk(clp, old);
473 }
474 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
475 nfs_put_client(clp);
476 return old;
477
478error:
479 nfs_mark_client_ready(clp, error);
480 nfs_put_client(clp);
481 return ERR_PTR(error);
482}
483
484/*
485 * SETCLIENTID just did a callback update with the callback ident in
486 * "drop," but server trunking discovery claims "drop" and "keep" are
487 * actually the same server. Swap the callback IDs so that "keep"
488 * will continue to use the callback ident the server now knows about,
489 * and so that "keep"'s original callback ident is destroyed when
490 * "drop" is freed.
491 */
492static void nfs4_swap_callback_idents(struct nfs_client *keep,
493 struct nfs_client *drop)
494{
495 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
496 unsigned int save = keep->cl_cb_ident;
497
498 if (keep->cl_cb_ident == drop->cl_cb_ident)
499 return;
500
501 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
502 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
503
504 spin_lock(&nn->nfs_client_lock);
505
506 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
507 keep->cl_cb_ident = drop->cl_cb_ident;
508
509 idr_replace(&nn->cb_ident_idr, drop, save);
510 drop->cl_cb_ident = save;
511
512 spin_unlock(&nn->nfs_client_lock);
513}
514
515static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
516 const struct nfs_client *clp2)
517{
518 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
519 return true;
520 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
521}
522
523static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
524{
525 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
526}
527
528static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
529 struct nfs_client **prev, struct nfs_net *nn)
530{
531 int status;
532
533 if (pos->rpc_ops != new->rpc_ops)
534 return 1;
535
536 if (pos->cl_minorversion != new->cl_minorversion)
537 return 1;
538
539 /* If "pos" isn't marked ready, we can't trust the
540 * remaining fields in "pos", especially the client
541 * ID and serverowner fields. Wait for CREATE_SESSION
542 * to finish. */
543 if (pos->cl_cons_state > NFS_CS_READY) {
544 refcount_inc(&pos->cl_count);
545 spin_unlock(&nn->nfs_client_lock);
546
547 nfs_put_client(*prev);
548 *prev = pos;
549
550 status = nfs_wait_client_init_complete(pos);
551 spin_lock(&nn->nfs_client_lock);
552
553 if (status < 0)
554 return status;
555 }
556
557 if (pos->cl_cons_state != NFS_CS_READY)
558 return 1;
559
560 if (pos->cl_clientid != new->cl_clientid)
561 return 1;
562
563 /* NFSv4.1 always uses the uniform string, however someone
564 * might switch the uniquifier string on us.
565 */
566 if (!nfs4_match_client_owner_id(pos, new))
567 return 1;
568
569 return 0;
570}
571
572/**
573 * nfs40_walk_client_list - Find server that recognizes a client ID
574 *
575 * @new: nfs_client with client ID to test
576 * @result: OUT: found nfs_client, or new
577 * @cred: credential to use for trunking test
578 *
579 * Returns zero, a negative errno, or a negative NFS4ERR status.
580 * If zero is returned, an nfs_client pointer is planted in "result."
581 *
582 * NB: nfs40_walk_client_list() relies on the new nfs_client being
583 * the last nfs_client on the list.
584 */
585int nfs40_walk_client_list(struct nfs_client *new,
586 struct nfs_client **result,
587 const struct cred *cred)
588{
589 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
590 struct nfs_client *pos, *prev = NULL;
591 struct nfs4_setclientid_res clid = {
592 .clientid = new->cl_clientid,
593 .confirm = new->cl_confirm,
594 };
595 int status = -NFS4ERR_STALE_CLIENTID;
596
597 spin_lock(&nn->nfs_client_lock);
598 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
599
600 if (pos == new)
601 goto found;
602
603 status = nfs4_match_client(pos, new, &prev, nn);
604 if (status < 0)
605 goto out_unlock;
606 if (status != 0)
607 continue;
608 /*
609 * We just sent a new SETCLIENTID, which should have
610 * caused the server to return a new cl_confirm. So if
611 * cl_confirm is the same, then this is a different
612 * server that just returned the same cl_confirm by
613 * coincidence:
614 */
615 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
616 &new->cl_confirm))
617 continue;
618 /*
619 * But if the cl_confirm's are different, then the only
620 * way that a SETCLIENTID_CONFIRM to pos can succeed is
621 * if new and pos point to the same server:
622 */
623found:
624 refcount_inc(&pos->cl_count);
625 spin_unlock(&nn->nfs_client_lock);
626
627 nfs_put_client(prev);
628 prev = pos;
629
630 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
631 switch (status) {
632 case -NFS4ERR_STALE_CLIENTID:
633 break;
634 case 0:
635 nfs4_swap_callback_idents(pos, new);
636 pos->cl_confirm = new->cl_confirm;
637 nfs_mark_client_ready(pos, NFS_CS_READY);
638
639 prev = NULL;
640 *result = pos;
641 goto out;
642 case -ERESTARTSYS:
643 case -ETIMEDOUT:
644 /* The callback path may have been inadvertently
645 * changed. Schedule recovery!
646 */
647 nfs4_schedule_path_down_recovery(pos);
648 goto out;
649 default:
650 goto out;
651 }
652
653 spin_lock(&nn->nfs_client_lock);
654 }
655out_unlock:
656 spin_unlock(&nn->nfs_client_lock);
657
658 /* No match found. The server lost our clientid */
659out:
660 nfs_put_client(prev);
661 return status;
662}
663
664#ifdef CONFIG_NFS_V4_1
665/*
666 * Returns true if the server major ids match
667 */
668bool
669nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
670 struct nfs41_server_owner *o2)
671{
672 if (o1->major_id_sz != o2->major_id_sz)
673 return false;
674 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
675}
676
677/*
678 * Returns true if the server scopes match
679 */
680static bool
681nfs4_check_server_scope(struct nfs41_server_scope *s1,
682 struct nfs41_server_scope *s2)
683{
684 if (s1->server_scope_sz != s2->server_scope_sz)
685 return false;
686 return memcmp(s1->server_scope, s2->server_scope,
687 s1->server_scope_sz) == 0;
688}
689
690/**
691 * nfs4_detect_session_trunking - Checks for session trunking.
692 * @clp: original mount nfs_client
693 * @res: result structure from an exchange_id using the original mount
694 * nfs_client with a new multi_addr transport
695 * @xprt: pointer to the transport to add.
696 *
697 * Called after a successful EXCHANGE_ID on a multi-addr connection.
698 * Upon success, add the transport.
699 *
700 * Returns zero on success, otherwise -EINVAL
701 *
702 * Note: since the exchange_id for the new multi_addr transport uses the
703 * same nfs_client from the original mount, the cl_owner_id is reused,
704 * so eir_clientowner is the same.
705 */
706int nfs4_detect_session_trunking(struct nfs_client *clp,
707 struct nfs41_exchange_id_res *res,
708 struct rpc_xprt *xprt)
709{
710 /* Check eir_clientid */
711 if (clp->cl_clientid != res->clientid)
712 goto out_err;
713
714 /* Check eir_server_owner so_major_id */
715 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
716 res->server_owner))
717 goto out_err;
718
719 /* Check eir_server_owner so_minor_id */
720 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
721 goto out_err;
722
723 /* Check eir_server_scope */
724 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
725 goto out_err;
726
727 pr_info("NFS: %s: Session trunking succeeded for %s\n",
728 clp->cl_hostname,
729 xprt->address_strings[RPC_DISPLAY_ADDR]);
730
731 return 0;
732out_err:
733 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
734 xprt->address_strings[RPC_DISPLAY_ADDR]);
735
736 return -EINVAL;
737}
738
739/**
740 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
741 *
742 * @new: nfs_client with client ID to test
743 * @result: OUT: found nfs_client, or new
744 * @cred: credential to use for trunking test
745 *
746 * Returns zero, a negative errno, or a negative NFS4ERR status.
747 * If zero is returned, an nfs_client pointer is planted in "result."
748 *
749 * NB: nfs41_walk_client_list() relies on the new nfs_client being
750 * the last nfs_client on the list.
751 */
752int nfs41_walk_client_list(struct nfs_client *new,
753 struct nfs_client **result,
754 const struct cred *cred)
755{
756 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
757 struct nfs_client *pos, *prev = NULL;
758 int status = -NFS4ERR_STALE_CLIENTID;
759
760 spin_lock(&nn->nfs_client_lock);
761 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
762
763 if (pos == new)
764 goto found;
765
766 status = nfs4_match_client(pos, new, &prev, nn);
767 if (status < 0)
768 goto out;
769 if (status != 0)
770 continue;
771
772 /*
773 * Note that session trunking is just a special subcase of
774 * client id trunking. In either case, we want to fall back
775 * to using the existing nfs_client.
776 */
777 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
778 new->cl_serverowner))
779 continue;
780
781found:
782 refcount_inc(&pos->cl_count);
783 *result = pos;
784 status = 0;
785 break;
786 }
787
788out:
789 spin_unlock(&nn->nfs_client_lock);
790 nfs_put_client(prev);
791 return status;
792}
793#endif /* CONFIG_NFS_V4_1 */
794
795static void nfs4_destroy_server(struct nfs_server *server)
796{
797 LIST_HEAD(freeme);
798
799 nfs_server_return_all_delegations(server);
800 unset_pnfs_layoutdriver(server);
801 nfs4_purge_state_owners(server, &freeme);
802 nfs4_free_state_owners(&freeme);
803}
804
805/*
806 * NFSv4.0 callback thread helper
807 *
808 * Find a client by callback identifier
809 */
810struct nfs_client *
811nfs4_find_client_ident(struct net *net, int cb_ident)
812{
813 struct nfs_client *clp;
814 struct nfs_net *nn = net_generic(net, nfs_net_id);
815
816 spin_lock(&nn->nfs_client_lock);
817 clp = idr_find(&nn->cb_ident_idr, cb_ident);
818 if (clp)
819 refcount_inc(&clp->cl_count);
820 spin_unlock(&nn->nfs_client_lock);
821 return clp;
822}
823
824#if defined(CONFIG_NFS_V4_1)
825/* Common match routine for v4.0 and v4.1 callback services */
826static bool nfs4_cb_match_client(const struct sockaddr *addr,
827 struct nfs_client *clp, u32 minorversion)
828{
829 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
830
831 /* Don't match clients that failed to initialise */
832 if (!(clp->cl_cons_state == NFS_CS_READY ||
833 clp->cl_cons_state == NFS_CS_SESSION_INITING))
834 return false;
835
836 smp_rmb();
837
838 /* Match the version and minorversion */
839 if (clp->rpc_ops->version != 4 ||
840 clp->cl_minorversion != minorversion)
841 return false;
842
843 /* Match only the IP address, not the port number */
844 return rpc_cmp_addr(addr, clap);
845}
846
847/*
848 * NFSv4.1 callback thread helper
849 * For CB_COMPOUND calls, find a client by IP address, protocol version,
850 * minorversion, and sessionID
851 *
852 * Returns NULL if no such client
853 */
854struct nfs_client *
855nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
856 struct nfs4_sessionid *sid, u32 minorversion)
857{
858 struct nfs_client *clp;
859 struct nfs_net *nn = net_generic(net, nfs_net_id);
860
861 spin_lock(&nn->nfs_client_lock);
862 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
863 if (!nfs4_cb_match_client(addr, clp, minorversion))
864 continue;
865
866 if (!nfs4_has_session(clp))
867 continue;
868
869 /* Match sessionid*/
870 if (memcmp(clp->cl_session->sess_id.data,
871 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
872 continue;
873
874 refcount_inc(&clp->cl_count);
875 spin_unlock(&nn->nfs_client_lock);
876 return clp;
877 }
878 spin_unlock(&nn->nfs_client_lock);
879 return NULL;
880}
881
882#else /* CONFIG_NFS_V4_1 */
883
884struct nfs_client *
885nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
886 struct nfs4_sessionid *sid, u32 minorversion)
887{
888 return NULL;
889}
890#endif /* CONFIG_NFS_V4_1 */
891
892/*
893 * Set up an NFS4 client
894 */
895static int nfs4_set_client(struct nfs_server *server,
896 const char *hostname,
897 const struct sockaddr_storage *addr,
898 const size_t addrlen,
899 const char *ip_addr,
900 int proto, const struct rpc_timeout *timeparms,
901 u32 minorversion, unsigned int nconnect,
902 unsigned int max_connect,
903 struct net *net,
904 struct xprtsec_parms *xprtsec)
905{
906 struct nfs_client_initdata cl_init = {
907 .hostname = hostname,
908 .addr = addr,
909 .addrlen = addrlen,
910 .ip_addr = ip_addr,
911 .nfs_mod = &nfs_v4,
912 .proto = proto,
913 .minorversion = minorversion,
914 .net = net,
915 .timeparms = timeparms,
916 .cred = server->cred,
917 .xprtsec = *xprtsec,
918 };
919 struct nfs_client *clp;
920
921 if (minorversion == 0)
922 __set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags);
923 else
924 cl_init.max_connect = max_connect;
925 switch (proto) {
926 case XPRT_TRANSPORT_RDMA:
927 case XPRT_TRANSPORT_TCP:
928 case XPRT_TRANSPORT_TCP_TLS:
929 cl_init.nconnect = nconnect;
930 }
931
932 if (server->flags & NFS_MOUNT_NORESVPORT)
933 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
934 if (server->options & NFS_OPTION_MIGRATION)
935 __set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
936 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
937 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
938 server->port = rpc_get_port((struct sockaddr *)addr);
939
940 /* Allocate or find a client reference we can use */
941 clp = nfs_get_client(&cl_init);
942 if (IS_ERR(clp))
943 return PTR_ERR(clp);
944
945 if (server->nfs_client == clp) {
946 nfs_put_client(clp);
947 return -ELOOP;
948 }
949
950 /*
951 * Query for the lease time on clientid setup or renewal
952 *
953 * Note that this will be set on nfs_clients that were created
954 * only for the DS role and did not set this bit, but now will
955 * serve a dual role.
956 */
957 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
958
959 server->nfs_client = clp;
960 nfs_sysfs_add_server(server);
961 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
962
963 return 0;
964}
965
966/*
967 * Set up a pNFS Data Server client.
968 *
969 * Return any existing nfs_client that matches server address,port,version
970 * and minorversion.
971 *
972 * For a new nfs_client, use a soft mount (default), a low retrans and a
973 * low timeout interval so that if a connection is lost, we retry through
974 * the MDS.
975 */
976struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
977 const struct sockaddr_storage *ds_addr, int ds_addrlen,
978 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
979 u32 minor_version)
980{
981 struct rpc_timeout ds_timeout;
982 struct nfs_client *mds_clp = mds_srv->nfs_client;
983 struct nfs_client_initdata cl_init = {
984 .addr = ds_addr,
985 .addrlen = ds_addrlen,
986 .nodename = mds_clp->cl_rpcclient->cl_nodename,
987 .ip_addr = mds_clp->cl_ipaddr,
988 .nfs_mod = &nfs_v4,
989 .proto = ds_proto,
990 .minorversion = minor_version,
991 .net = mds_clp->cl_net,
992 .timeparms = &ds_timeout,
993 .cred = mds_srv->cred,
994 .xprtsec = mds_srv->nfs_client->cl_xprtsec,
995 };
996 char buf[INET6_ADDRSTRLEN + 1];
997
998 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0)
999 return ERR_PTR(-EINVAL);
1000 cl_init.hostname = buf;
1001
1002 switch (ds_proto) {
1003 case XPRT_TRANSPORT_RDMA:
1004 case XPRT_TRANSPORT_TCP:
1005 case XPRT_TRANSPORT_TCP_TLS:
1006 if (mds_clp->cl_nconnect > 1) {
1007 cl_init.nconnect = mds_clp->cl_nconnect;
1008 cl_init.max_connect = NFS_MAX_TRANSPORTS;
1009 }
1010 }
1011
1012 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
1013 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
1014
1015 __set_bit(NFS_CS_PNFS, &cl_init.init_flags);
1016 cl_init.max_connect = NFS_MAX_TRANSPORTS;
1017 /*
1018 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1019 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1020 * (section 13.1 RFC 5661).
1021 */
1022 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
1023 return nfs_get_client(&cl_init);
1024}
1025EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1026
1027/*
1028 * Session has been established, and the client marked ready.
1029 * Limit the mount rsize, wsize and dtsize using negotiated fore
1030 * channel attributes.
1031 */
1032static void nfs4_session_limit_rwsize(struct nfs_server *server)
1033{
1034#ifdef CONFIG_NFS_V4_1
1035 struct nfs4_session *sess;
1036 u32 server_resp_sz;
1037 u32 server_rqst_sz;
1038
1039 if (!nfs4_has_session(server->nfs_client))
1040 return;
1041 sess = server->nfs_client->cl_session;
1042 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1043 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1044
1045 if (server->dtsize > server_resp_sz)
1046 server->dtsize = server_resp_sz;
1047 if (server->rsize > server_resp_sz)
1048 server->rsize = server_resp_sz;
1049 if (server->wsize > server_rqst_sz)
1050 server->wsize = server_rqst_sz;
1051#endif /* CONFIG_NFS_V4_1 */
1052}
1053
1054/*
1055 * Limit xattr sizes using the channel attributes.
1056 */
1057static void nfs4_session_limit_xasize(struct nfs_server *server)
1058{
1059#ifdef CONFIG_NFS_V4_2
1060 struct nfs4_session *sess;
1061 u32 server_gxa_sz;
1062 u32 server_sxa_sz;
1063 u32 server_lxa_sz;
1064
1065 if (!nfs4_has_session(server->nfs_client))
1066 return;
1067
1068 sess = server->nfs_client->cl_session;
1069
1070 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead;
1071 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead;
1072 server_lxa_sz = sess->fc_attrs.max_resp_sz -
1073 nfs42_maxlistxattrs_overhead;
1074
1075 if (server->gxasize > server_gxa_sz)
1076 server->gxasize = server_gxa_sz;
1077 if (server->sxasize > server_sxa_sz)
1078 server->sxasize = server_sxa_sz;
1079 if (server->lxasize > server_lxa_sz)
1080 server->lxasize = server_lxa_sz;
1081#endif
1082}
1083
1084void nfs4_server_set_init_caps(struct nfs_server *server)
1085{
1086 /* Set the basic capabilities */
1087 server->caps |= server->nfs_client->cl_mvops->init_caps;
1088 if (server->flags & NFS_MOUNT_NORDIRPLUS)
1089 server->caps &= ~NFS_CAP_READDIRPLUS;
1090 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA)
1091 server->caps &= ~NFS_CAP_READ_PLUS;
1092
1093 /*
1094 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1095 * authentication.
1096 */
1097 if (nfs4_disable_idmapping &&
1098 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1099 server->caps |= NFS_CAP_UIDGID_NOMAP;
1100}
1101
1102static int nfs4_server_common_setup(struct nfs_server *server,
1103 struct nfs_fh *mntfh, bool auth_probe)
1104{
1105 int error;
1106
1107 /* data servers support only a subset of NFSv4.1 */
1108 if (is_ds_only_client(server->nfs_client))
1109 return -EPROTONOSUPPORT;
1110
1111 /* We must ensure the session is initialised first */
1112 error = nfs4_init_session(server->nfs_client);
1113 if (error < 0)
1114 goto out;
1115
1116 nfs4_server_set_init_caps(server);
1117
1118 /* Probe the root fh to retrieve its FSID and filehandle */
1119 error = nfs4_get_rootfh(server, mntfh, auth_probe);
1120 if (error < 0)
1121 goto out;
1122
1123 dprintk("Server FSID: %llx:%llx\n",
1124 (unsigned long long) server->fsid.major,
1125 (unsigned long long) server->fsid.minor);
1126 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1127
1128 error = nfs_probe_server(server, mntfh);
1129 if (error < 0)
1130 goto out;
1131
1132 nfs4_session_limit_rwsize(server);
1133 nfs4_session_limit_xasize(server);
1134
1135 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1136 server->namelen = NFS4_MAXNAMLEN;
1137
1138 nfs_server_insert_lists(server);
1139 server->mount_time = jiffies;
1140 server->destroy = nfs4_destroy_server;
1141out:
1142 return error;
1143}
1144
1145/*
1146 * Create a version 4 volume record
1147 */
1148static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
1149{
1150 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1151 struct rpc_timeout timeparms;
1152 int error;
1153
1154 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
1155 ctx->timeo, ctx->retrans);
1156
1157 /* Initialise the client representation from the mount data */
1158 server->flags = ctx->flags;
1159 server->options = ctx->options;
1160 server->auth_info = ctx->auth_info;
1161
1162 /* Use the first specified auth flavor. If this flavor isn't
1163 * allowed by the server, use the SECINFO path to try the
1164 * other specified flavors */
1165 if (ctx->auth_info.flavor_len >= 1)
1166 ctx->selected_flavor = ctx->auth_info.flavors[0];
1167 else
1168 ctx->selected_flavor = RPC_AUTH_UNIX;
1169
1170 /* Get a client record */
1171 error = nfs4_set_client(server,
1172 ctx->nfs_server.hostname,
1173 &ctx->nfs_server._address,
1174 ctx->nfs_server.addrlen,
1175 ctx->client_address,
1176 ctx->nfs_server.protocol,
1177 &timeparms,
1178 ctx->minorversion,
1179 ctx->nfs_server.nconnect,
1180 ctx->nfs_server.max_connect,
1181 fc->net_ns,
1182 &ctx->xprtsec);
1183 if (error < 0)
1184 return error;
1185
1186 if (ctx->rsize)
1187 server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto);
1188 if (ctx->wsize)
1189 server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto);
1190
1191 server->acregmin = ctx->acregmin * HZ;
1192 server->acregmax = ctx->acregmax * HZ;
1193 server->acdirmin = ctx->acdirmin * HZ;
1194 server->acdirmax = ctx->acdirmax * HZ;
1195 server->port = ctx->nfs_server.port;
1196
1197 return nfs_init_server_rpcclient(server, &timeparms,
1198 ctx->selected_flavor);
1199}
1200
1201/*
1202 * Create a version 4 volume record
1203 * - keyed on server and FSID
1204 */
1205struct nfs_server *nfs4_create_server(struct fs_context *fc)
1206{
1207 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1208 struct nfs_server *server;
1209 bool auth_probe;
1210 int error;
1211
1212 server = nfs_alloc_server();
1213 if (!server)
1214 return ERR_PTR(-ENOMEM);
1215
1216 server->cred = get_cred(fc->cred);
1217
1218 auth_probe = ctx->auth_info.flavor_len < 1;
1219
1220 /* set up the general RPC client */
1221 error = nfs4_init_server(server, fc);
1222 if (error < 0)
1223 goto error;
1224
1225 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1226 if (error < 0)
1227 goto error;
1228
1229 return server;
1230
1231error:
1232 nfs_free_server(server);
1233 return ERR_PTR(error);
1234}
1235
1236/*
1237 * Create an NFS4 referral server record
1238 */
1239struct nfs_server *nfs4_create_referral_server(struct fs_context *fc)
1240{
1241 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1242 struct nfs_client *parent_client;
1243 struct nfs_server *server, *parent_server;
1244 int proto, error;
1245 bool auth_probe;
1246
1247 server = nfs_alloc_server();
1248 if (!server)
1249 return ERR_PTR(-ENOMEM);
1250
1251 parent_server = NFS_SB(ctx->clone_data.sb);
1252 parent_client = parent_server->nfs_client;
1253
1254 server->cred = get_cred(parent_server->cred);
1255
1256 /* Initialise the client representation from the parent server */
1257 nfs_server_copy_userdata(server, parent_server);
1258
1259 /* Get a client representation */
1260#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1261 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT);
1262 error = nfs4_set_client(server,
1263 ctx->nfs_server.hostname,
1264 &ctx->nfs_server._address,
1265 ctx->nfs_server.addrlen,
1266 parent_client->cl_ipaddr,
1267 XPRT_TRANSPORT_RDMA,
1268 parent_server->client->cl_timeout,
1269 parent_client->cl_mvops->minor_version,
1270 parent_client->cl_nconnect,
1271 parent_client->cl_max_connect,
1272 parent_client->cl_net,
1273 &parent_client->cl_xprtsec);
1274 if (!error)
1275 goto init_server;
1276#endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */
1277
1278 proto = XPRT_TRANSPORT_TCP;
1279 if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE)
1280 proto = XPRT_TRANSPORT_TCP_TLS;
1281 rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
1282 error = nfs4_set_client(server,
1283 ctx->nfs_server.hostname,
1284 &ctx->nfs_server._address,
1285 ctx->nfs_server.addrlen,
1286 parent_client->cl_ipaddr,
1287 proto,
1288 parent_server->client->cl_timeout,
1289 parent_client->cl_mvops->minor_version,
1290 parent_client->cl_nconnect,
1291 parent_client->cl_max_connect,
1292 parent_client->cl_net,
1293 &parent_client->cl_xprtsec);
1294 if (error < 0)
1295 goto error;
1296
1297#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1298init_server:
1299#endif
1300 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
1301 ctx->selected_flavor);
1302 if (error < 0)
1303 goto error;
1304
1305 auth_probe = parent_server->auth_info.flavor_len < 1;
1306
1307 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1308 if (error < 0)
1309 goto error;
1310
1311 return server;
1312
1313error:
1314 nfs_free_server(server);
1315 return ERR_PTR(error);
1316}
1317
1318/**
1319 * nfs4_update_server - Move an nfs_server to a different nfs_client
1320 *
1321 * @server: represents FSID to be moved
1322 * @hostname: new end-point's hostname
1323 * @sap: new end-point's socket address
1324 * @salen: size of "sap"
1325 * @net: net namespace
1326 *
1327 * The nfs_server must be quiescent before this function is invoked.
1328 * Either its session is drained (NFSv4.1+), or its transport is
1329 * plugged and drained (NFSv4.0).
1330 *
1331 * Returns zero on success, or a negative errno value.
1332 */
1333int nfs4_update_server(struct nfs_server *server, const char *hostname,
1334 struct sockaddr_storage *sap, size_t salen, struct net *net)
1335{
1336 struct nfs_client *clp = server->nfs_client;
1337 struct rpc_clnt *clnt = server->client;
1338 struct xprt_create xargs = {
1339 .ident = clp->cl_proto,
1340 .net = net,
1341 .dstaddr = (struct sockaddr *)sap,
1342 .addrlen = salen,
1343 .servername = hostname,
1344 /* cel: bleh. We might need to pass TLS parameters here */
1345 };
1346 char buf[INET6_ADDRSTRLEN + 1];
1347 struct sockaddr_storage address;
1348 struct sockaddr *localaddr = (struct sockaddr *)&address;
1349 int error;
1350
1351 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1352 if (error != 0)
1353 return error;
1354
1355 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1356 if (error != 0)
1357 return error;
1358
1359 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1360 return -EAFNOSUPPORT;
1361
1362 nfs_server_remove_lists(server);
1363 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1364 error = nfs4_set_client(server, hostname, sap, salen, buf,
1365 clp->cl_proto, clnt->cl_timeout,
1366 clp->cl_minorversion,
1367 clp->cl_nconnect, clp->cl_max_connect,
1368 net, &clp->cl_xprtsec);
1369 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1370 if (error != 0) {
1371 nfs_server_insert_lists(server);
1372 return error;
1373 }
1374 nfs_put_client(clp);
1375
1376 if (server->nfs_client->cl_hostname == NULL) {
1377 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1378 if (server->nfs_client->cl_hostname == NULL)
1379 return -ENOMEM;
1380 }
1381 nfs_server_insert_lists(server);
1382
1383 return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root)));
1384}