Loading...
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
22#define NFSDBG_FACILITY NFSDBG_CLIENT
23
24/*
25 * Get a unique NFSv4.0 callback identifier which will be used
26 * by the V4.0 callback service to lookup the nfs_client struct
27 */
28static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
29{
30 int ret = 0;
31 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
32
33 if (clp->rpc_ops->version != 4 || minorversion != 0)
34 return ret;
35 idr_preload(GFP_KERNEL);
36 spin_lock(&nn->nfs_client_lock);
37 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
38 if (ret >= 0)
39 clp->cl_cb_ident = ret;
40 spin_unlock(&nn->nfs_client_lock);
41 idr_preload_end();
42 return ret < 0 ? ret : 0;
43}
44
45#ifdef CONFIG_NFS_V4_1
46/*
47 * Per auth flavor data server rpc clients
48 */
49struct nfs4_ds_server {
50 struct list_head list; /* ds_clp->cl_ds_clients */
51 struct rpc_clnt *rpc_clnt;
52};
53
54/**
55 * nfs4_find_ds_client - Common lookup case for DS I/O
56 * @ds_clp: pointer to the DS's nfs_client
57 * @flavor: rpc auth flavour to match
58 */
59static struct nfs4_ds_server *
60nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
61{
62 struct nfs4_ds_server *dss;
63
64 rcu_read_lock();
65 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
66 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
67 continue;
68 goto out;
69 }
70 dss = NULL;
71out:
72 rcu_read_unlock();
73 return dss;
74}
75
76static struct nfs4_ds_server *
77nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
78 struct nfs4_ds_server *new)
79{
80 struct nfs4_ds_server *dss;
81
82 spin_lock(&ds_clp->cl_lock);
83 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
84 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
85 continue;
86 goto out;
87 }
88 if (new)
89 list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
90 dss = new;
91out:
92 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
93 return dss;
94}
95
96static struct nfs4_ds_server *
97nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
98{
99 struct nfs4_ds_server *dss;
100
101 dss = kmalloc(sizeof(*dss), GFP_NOFS);
102 if (dss == NULL)
103 return ERR_PTR(-ENOMEM);
104
105 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
106 if (IS_ERR(dss->rpc_clnt)) {
107 int err = PTR_ERR(dss->rpc_clnt);
108 kfree (dss);
109 return ERR_PTR(err);
110 }
111 INIT_LIST_HEAD(&dss->list);
112
113 return dss;
114}
115
116static void
117nfs4_free_ds_server(struct nfs4_ds_server *dss)
118{
119 rpc_release_client(dss->rpc_clnt);
120 kfree(dss);
121}
122
123/**
124 * nfs4_find_or_create_ds_client - Find or create a DS rpc client
125 * @ds_clp: pointer to the DS's nfs_client
126 * @inode: pointer to the inode
127 *
128 * Find or create a DS rpc client with th MDS server rpc client auth flavor
129 * in the nfs_client cl_ds_clients list.
130 */
131struct rpc_clnt *
132nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
133{
134 struct nfs4_ds_server *dss, *new;
135 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
136
137 dss = nfs4_find_ds_client(ds_clp, flavor);
138 if (dss != NULL)
139 goto out;
140 new = nfs4_alloc_ds_server(ds_clp, flavor);
141 if (IS_ERR(new))
142 return ERR_CAST(new);
143 dss = nfs4_add_ds_client(ds_clp, flavor, new);
144 if (dss != new)
145 nfs4_free_ds_server(new);
146out:
147 return dss->rpc_clnt;
148}
149EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
150
151static void
152nfs4_shutdown_ds_clients(struct nfs_client *clp)
153{
154 struct nfs4_ds_server *dss;
155
156 while (!list_empty(&clp->cl_ds_clients)) {
157 dss = list_entry(clp->cl_ds_clients.next,
158 struct nfs4_ds_server, list);
159 list_del(&dss->list);
160 rpc_shutdown_client(dss->rpc_clnt);
161 kfree (dss);
162 }
163}
164
165static void
166nfs4_cleanup_callback(struct nfs_client *clp)
167{
168 struct nfs4_copy_state *cp_state;
169
170 while (!list_empty(&clp->pending_cb_stateids)) {
171 cp_state = list_entry(clp->pending_cb_stateids.next,
172 struct nfs4_copy_state, copies);
173 list_del(&cp_state->copies);
174 kfree(cp_state);
175 }
176}
177
178void nfs41_shutdown_client(struct nfs_client *clp)
179{
180 if (nfs4_has_session(clp)) {
181 nfs4_cleanup_callback(clp);
182 nfs4_shutdown_ds_clients(clp);
183 nfs4_destroy_session(clp->cl_session);
184 nfs4_destroy_clientid(clp);
185 }
186
187}
188#endif /* CONFIG_NFS_V4_1 */
189
190void nfs40_shutdown_client(struct nfs_client *clp)
191{
192 if (clp->cl_slot_tbl) {
193 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
194 kfree(clp->cl_slot_tbl);
195 }
196}
197
198struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
199{
200 char buf[INET6_ADDRSTRLEN + 1];
201 const char *ip_addr = cl_init->ip_addr;
202 struct nfs_client *clp = nfs_alloc_client(cl_init);
203 int err;
204
205 if (IS_ERR(clp))
206 return clp;
207
208 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
209 if (err)
210 goto error;
211
212 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
213 err = -EINVAL;
214 goto error;
215 }
216
217 spin_lock_init(&clp->cl_lock);
218 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
219 INIT_LIST_HEAD(&clp->cl_ds_clients);
220 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
221 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
222 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
223 clp->cl_mig_gen = 1;
224#if IS_ENABLED(CONFIG_NFS_V4_1)
225 init_waitqueue_head(&clp->cl_lock_waitq);
226#endif
227 INIT_LIST_HEAD(&clp->pending_cb_stateids);
228
229 if (cl_init->minorversion != 0)
230 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
231 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
232 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
233
234 /*
235 * Set up the connection to the server before we add add to the
236 * global list.
237 */
238 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
239 if (err == -EINVAL)
240 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
241 if (err < 0)
242 goto error;
243
244 /* If no clientaddr= option was specified, find a usable cb address */
245 if (ip_addr == NULL) {
246 struct sockaddr_storage cb_addr;
247 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
248
249 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
250 if (err < 0)
251 goto error;
252 err = rpc_ntop(sap, buf, sizeof(buf));
253 if (err < 0)
254 goto error;
255 ip_addr = (const char *)buf;
256 }
257 strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
258
259 err = nfs_idmap_new(clp);
260 if (err < 0) {
261 dprintk("%s: failed to create idmapper. Error = %d\n",
262 __func__, err);
263 goto error;
264 }
265 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
266 return clp;
267
268error:
269 nfs_free_client(clp);
270 return ERR_PTR(err);
271}
272
273/*
274 * Destroy the NFS4 callback service
275 */
276static void nfs4_destroy_callback(struct nfs_client *clp)
277{
278 if (__test_and_clear_bit(NFS_CS_CALLBACK, &clp->cl_res_state))
279 nfs_callback_down(clp->cl_mvops->minor_version, clp->cl_net);
280}
281
282static 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
298void 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 */
307static 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 * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
333 * @clp: nfs_client to initialize
334 *
335 * Returns zero on success, or a negative errno if some error occurred.
336 */
337int nfs40_init_client(struct nfs_client *clp)
338{
339 struct nfs4_slot_table *tbl;
340 int ret;
341
342 tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
343 if (tbl == NULL)
344 return -ENOMEM;
345
346 ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
347 "NFSv4.0 transport Slot table");
348 if (ret) {
349 kfree(tbl);
350 return ret;
351 }
352
353 clp->cl_slot_tbl = tbl;
354 return 0;
355}
356
357#if defined(CONFIG_NFS_V4_1)
358
359/**
360 * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
361 * @clp: nfs_client to initialize
362 *
363 * Returns zero on success, or a negative errno if some error occurred.
364 */
365int nfs41_init_client(struct nfs_client *clp)
366{
367 struct nfs4_session *session = NULL;
368
369 /*
370 * Create the session and mark it expired.
371 * When a SEQUENCE operation encounters the expired session
372 * it will do session recovery to initialize it.
373 */
374 session = nfs4_alloc_session(clp);
375 if (!session)
376 return -ENOMEM;
377
378 clp->cl_session = session;
379
380 /*
381 * The create session reply races with the server back
382 * channel probe. Mark the client NFS_CS_SESSION_INITING
383 * so that the client back channel can find the
384 * nfs_client struct
385 */
386 nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
387 return 0;
388}
389
390#endif /* CONFIG_NFS_V4_1 */
391
392/*
393 * Initialize the minor version specific parts of an NFS4 client record
394 */
395static int nfs4_init_client_minor_version(struct nfs_client *clp)
396{
397 int ret;
398
399 ret = clp->cl_mvops->init_client(clp);
400 if (ret)
401 return ret;
402 return nfs4_init_callback(clp);
403}
404
405/**
406 * nfs4_init_client - Initialise an NFS4 client record
407 *
408 * @clp: nfs_client to initialise
409 * @cl_init: pointer to nfs_client_initdata
410 *
411 * Returns pointer to an NFS client, or an ERR_PTR value.
412 */
413struct nfs_client *nfs4_init_client(struct nfs_client *clp,
414 const struct nfs_client_initdata *cl_init)
415{
416 struct nfs_client *old;
417 int error;
418
419 if (clp->cl_cons_state == NFS_CS_READY)
420 /* the client is initialised already */
421 return clp;
422
423 error = nfs4_init_client_minor_version(clp);
424 if (error < 0)
425 goto error;
426
427 error = nfs4_discover_server_trunking(clp, &old);
428 if (error < 0)
429 goto error;
430
431 if (clp != old) {
432 clp->cl_preserve_clid = true;
433 /*
434 * Mark the client as having failed initialization so other
435 * processes walking the nfs_client_list in nfs_match_client()
436 * won't try to use it.
437 */
438 nfs_mark_client_ready(clp, -EPERM);
439 }
440 clear_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags);
441 nfs_put_client(clp);
442 return old;
443
444error:
445 nfs_mark_client_ready(clp, error);
446 nfs_put_client(clp);
447 return ERR_PTR(error);
448}
449
450/*
451 * SETCLIENTID just did a callback update with the callback ident in
452 * "drop," but server trunking discovery claims "drop" and "keep" are
453 * actually the same server. Swap the callback IDs so that "keep"
454 * will continue to use the callback ident the server now knows about,
455 * and so that "keep"'s original callback ident is destroyed when
456 * "drop" is freed.
457 */
458static void nfs4_swap_callback_idents(struct nfs_client *keep,
459 struct nfs_client *drop)
460{
461 struct nfs_net *nn = net_generic(keep->cl_net, nfs_net_id);
462 unsigned int save = keep->cl_cb_ident;
463
464 if (keep->cl_cb_ident == drop->cl_cb_ident)
465 return;
466
467 dprintk("%s: keeping callback ident %u and dropping ident %u\n",
468 __func__, keep->cl_cb_ident, drop->cl_cb_ident);
469
470 spin_lock(&nn->nfs_client_lock);
471
472 idr_replace(&nn->cb_ident_idr, keep, drop->cl_cb_ident);
473 keep->cl_cb_ident = drop->cl_cb_ident;
474
475 idr_replace(&nn->cb_ident_idr, drop, save);
476 drop->cl_cb_ident = save;
477
478 spin_unlock(&nn->nfs_client_lock);
479}
480
481static bool nfs4_match_client_owner_id(const struct nfs_client *clp1,
482 const struct nfs_client *clp2)
483{
484 if (clp1->cl_owner_id == NULL || clp2->cl_owner_id == NULL)
485 return true;
486 return strcmp(clp1->cl_owner_id, clp2->cl_owner_id) == 0;
487}
488
489static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
490{
491 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
492}
493
494static int nfs4_match_client(struct nfs_client *pos, struct nfs_client *new,
495 struct nfs_client **prev, struct nfs_net *nn)
496{
497 int status;
498
499 if (pos->rpc_ops != new->rpc_ops)
500 return 1;
501
502 if (pos->cl_minorversion != new->cl_minorversion)
503 return 1;
504
505 /* If "pos" isn't marked ready, we can't trust the
506 * remaining fields in "pos", especially the client
507 * ID and serverowner fields. Wait for CREATE_SESSION
508 * to finish. */
509 if (pos->cl_cons_state > NFS_CS_READY) {
510 refcount_inc(&pos->cl_count);
511 spin_unlock(&nn->nfs_client_lock);
512
513 nfs_put_client(*prev);
514 *prev = pos;
515
516 status = nfs_wait_client_init_complete(pos);
517 spin_lock(&nn->nfs_client_lock);
518
519 if (status < 0)
520 return status;
521 }
522
523 if (pos->cl_cons_state != NFS_CS_READY)
524 return 1;
525
526 if (pos->cl_clientid != new->cl_clientid)
527 return 1;
528
529 /* NFSv4.1 always uses the uniform string, however someone
530 * might switch the uniquifier string on us.
531 */
532 if (!nfs4_match_client_owner_id(pos, new))
533 return 1;
534
535 return 0;
536}
537
538/**
539 * nfs40_walk_client_list - Find server that recognizes a client ID
540 *
541 * @new: nfs_client with client ID to test
542 * @result: OUT: found nfs_client, or new
543 * @cred: credential to use for trunking test
544 *
545 * Returns zero, a negative errno, or a negative NFS4ERR status.
546 * If zero is returned, an nfs_client pointer is planted in "result."
547 *
548 * NB: nfs40_walk_client_list() relies on the new nfs_client being
549 * the last nfs_client on the list.
550 */
551int nfs40_walk_client_list(struct nfs_client *new,
552 struct nfs_client **result,
553 const struct cred *cred)
554{
555 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
556 struct nfs_client *pos, *prev = NULL;
557 struct nfs4_setclientid_res clid = {
558 .clientid = new->cl_clientid,
559 .confirm = new->cl_confirm,
560 };
561 int status = -NFS4ERR_STALE_CLIENTID;
562
563 spin_lock(&nn->nfs_client_lock);
564 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
565
566 if (pos == new)
567 goto found;
568
569 status = nfs4_match_client(pos, new, &prev, nn);
570 if (status < 0)
571 goto out_unlock;
572 if (status != 0)
573 continue;
574 /*
575 * We just sent a new SETCLIENTID, which should have
576 * caused the server to return a new cl_confirm. So if
577 * cl_confirm is the same, then this is a different
578 * server that just returned the same cl_confirm by
579 * coincidence:
580 */
581 if ((new != pos) && nfs4_same_verifier(&pos->cl_confirm,
582 &new->cl_confirm))
583 continue;
584 /*
585 * But if the cl_confirm's are different, then the only
586 * way that a SETCLIENTID_CONFIRM to pos can succeed is
587 * if new and pos point to the same server:
588 */
589found:
590 refcount_inc(&pos->cl_count);
591 spin_unlock(&nn->nfs_client_lock);
592
593 nfs_put_client(prev);
594 prev = pos;
595
596 status = nfs4_proc_setclientid_confirm(pos, &clid, cred);
597 switch (status) {
598 case -NFS4ERR_STALE_CLIENTID:
599 break;
600 case 0:
601 nfs4_swap_callback_idents(pos, new);
602 pos->cl_confirm = new->cl_confirm;
603 nfs_mark_client_ready(pos, NFS_CS_READY);
604
605 prev = NULL;
606 *result = pos;
607 goto out;
608 case -ERESTARTSYS:
609 case -ETIMEDOUT:
610 /* The callback path may have been inadvertently
611 * changed. Schedule recovery!
612 */
613 nfs4_schedule_path_down_recovery(pos);
614 goto out;
615 default:
616 goto out;
617 }
618
619 spin_lock(&nn->nfs_client_lock);
620 }
621out_unlock:
622 spin_unlock(&nn->nfs_client_lock);
623
624 /* No match found. The server lost our clientid */
625out:
626 nfs_put_client(prev);
627 return status;
628}
629
630#ifdef CONFIG_NFS_V4_1
631/*
632 * Returns true if the server major ids match
633 */
634bool
635nfs4_check_serverowner_major_id(struct nfs41_server_owner *o1,
636 struct nfs41_server_owner *o2)
637{
638 if (o1->major_id_sz != o2->major_id_sz)
639 return false;
640 return memcmp(o1->major_id, o2->major_id, o1->major_id_sz) == 0;
641}
642
643/*
644 * Returns true if the server scopes match
645 */
646static bool
647nfs4_check_server_scope(struct nfs41_server_scope *s1,
648 struct nfs41_server_scope *s2)
649{
650 if (s1->server_scope_sz != s2->server_scope_sz)
651 return false;
652 return memcmp(s1->server_scope, s2->server_scope,
653 s1->server_scope_sz) == 0;
654}
655
656/**
657 * nfs4_detect_session_trunking - Checks for session trunking.
658 * @clp: original mount nfs_client
659 * @res: result structure from an exchange_id using the original mount
660 * nfs_client with a new multi_addr transport
661 * @xprt: pointer to the transport to add.
662 *
663 * Called after a successful EXCHANGE_ID on a multi-addr connection.
664 * Upon success, add the transport.
665 *
666 * Returns zero on success, otherwise -EINVAL
667 *
668 * Note: since the exchange_id for the new multi_addr transport uses the
669 * same nfs_client from the original mount, the cl_owner_id is reused,
670 * so eir_clientowner is the same.
671 */
672int nfs4_detect_session_trunking(struct nfs_client *clp,
673 struct nfs41_exchange_id_res *res,
674 struct rpc_xprt *xprt)
675{
676 /* Check eir_clientid */
677 if (clp->cl_clientid != res->clientid)
678 goto out_err;
679
680 /* Check eir_server_owner so_major_id */
681 if (!nfs4_check_serverowner_major_id(clp->cl_serverowner,
682 res->server_owner))
683 goto out_err;
684
685 /* Check eir_server_owner so_minor_id */
686 if (clp->cl_serverowner->minor_id != res->server_owner->minor_id)
687 goto out_err;
688
689 /* Check eir_server_scope */
690 if (!nfs4_check_server_scope(clp->cl_serverscope, res->server_scope))
691 goto out_err;
692
693 pr_info("NFS: %s: Session trunking succeeded for %s\n",
694 clp->cl_hostname,
695 xprt->address_strings[RPC_DISPLAY_ADDR]);
696
697 return 0;
698out_err:
699 pr_info("NFS: %s: Session trunking failed for %s\n", clp->cl_hostname,
700 xprt->address_strings[RPC_DISPLAY_ADDR]);
701
702 return -EINVAL;
703}
704
705/**
706 * nfs41_walk_client_list - Find nfs_client that matches a client/server owner
707 *
708 * @new: nfs_client with client ID to test
709 * @result: OUT: found nfs_client, or new
710 * @cred: credential to use for trunking test
711 *
712 * Returns zero, a negative errno, or a negative NFS4ERR status.
713 * If zero is returned, an nfs_client pointer is planted in "result."
714 *
715 * NB: nfs41_walk_client_list() relies on the new nfs_client being
716 * the last nfs_client on the list.
717 */
718int nfs41_walk_client_list(struct nfs_client *new,
719 struct nfs_client **result,
720 const struct cred *cred)
721{
722 struct nfs_net *nn = net_generic(new->cl_net, nfs_net_id);
723 struct nfs_client *pos, *prev = NULL;
724 int status = -NFS4ERR_STALE_CLIENTID;
725
726 spin_lock(&nn->nfs_client_lock);
727 list_for_each_entry(pos, &nn->nfs_client_list, cl_share_link) {
728
729 if (pos == new)
730 goto found;
731
732 status = nfs4_match_client(pos, new, &prev, nn);
733 if (status < 0)
734 goto out;
735 if (status != 0)
736 continue;
737
738 /*
739 * Note that session trunking is just a special subcase of
740 * client id trunking. In either case, we want to fall back
741 * to using the existing nfs_client.
742 */
743 if (!nfs4_check_serverowner_major_id(pos->cl_serverowner,
744 new->cl_serverowner))
745 continue;
746
747found:
748 refcount_inc(&pos->cl_count);
749 *result = pos;
750 status = 0;
751 break;
752 }
753
754out:
755 spin_unlock(&nn->nfs_client_lock);
756 nfs_put_client(prev);
757 return status;
758}
759#endif /* CONFIG_NFS_V4_1 */
760
761static void nfs4_destroy_server(struct nfs_server *server)
762{
763 LIST_HEAD(freeme);
764
765 nfs_server_return_all_delegations(server);
766 unset_pnfs_layoutdriver(server);
767 nfs4_purge_state_owners(server, &freeme);
768 nfs4_free_state_owners(&freeme);
769}
770
771/*
772 * NFSv4.0 callback thread helper
773 *
774 * Find a client by callback identifier
775 */
776struct nfs_client *
777nfs4_find_client_ident(struct net *net, int cb_ident)
778{
779 struct nfs_client *clp;
780 struct nfs_net *nn = net_generic(net, nfs_net_id);
781
782 spin_lock(&nn->nfs_client_lock);
783 clp = idr_find(&nn->cb_ident_idr, cb_ident);
784 if (clp)
785 refcount_inc(&clp->cl_count);
786 spin_unlock(&nn->nfs_client_lock);
787 return clp;
788}
789
790#if defined(CONFIG_NFS_V4_1)
791/* Common match routine for v4.0 and v4.1 callback services */
792static bool nfs4_cb_match_client(const struct sockaddr *addr,
793 struct nfs_client *clp, u32 minorversion)
794{
795 struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr;
796
797 /* Don't match clients that failed to initialise */
798 if (!(clp->cl_cons_state == NFS_CS_READY ||
799 clp->cl_cons_state == NFS_CS_SESSION_INITING))
800 return false;
801
802 smp_rmb();
803
804 /* Match the version and minorversion */
805 if (clp->rpc_ops->version != 4 ||
806 clp->cl_minorversion != minorversion)
807 return false;
808
809 /* Match only the IP address, not the port number */
810 return rpc_cmp_addr(addr, clap);
811}
812
813/*
814 * NFSv4.1 callback thread helper
815 * For CB_COMPOUND calls, find a client by IP address, protocol version,
816 * minorversion, and sessionID
817 *
818 * Returns NULL if no such client
819 */
820struct nfs_client *
821nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
822 struct nfs4_sessionid *sid, u32 minorversion)
823{
824 struct nfs_client *clp;
825 struct nfs_net *nn = net_generic(net, nfs_net_id);
826
827 spin_lock(&nn->nfs_client_lock);
828 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
829 if (!nfs4_cb_match_client(addr, clp, minorversion))
830 continue;
831
832 if (!nfs4_has_session(clp))
833 continue;
834
835 /* Match sessionid*/
836 if (memcmp(clp->cl_session->sess_id.data,
837 sid->data, NFS4_MAX_SESSIONID_LEN) != 0)
838 continue;
839
840 refcount_inc(&clp->cl_count);
841 spin_unlock(&nn->nfs_client_lock);
842 return clp;
843 }
844 spin_unlock(&nn->nfs_client_lock);
845 return NULL;
846}
847
848#else /* CONFIG_NFS_V4_1 */
849
850struct nfs_client *
851nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr,
852 struct nfs4_sessionid *sid, u32 minorversion)
853{
854 return NULL;
855}
856#endif /* CONFIG_NFS_V4_1 */
857
858/*
859 * Set up an NFS4 client
860 */
861static int nfs4_set_client(struct nfs_server *server,
862 const char *hostname,
863 const struct sockaddr *addr,
864 const size_t addrlen,
865 const char *ip_addr,
866 int proto, const struct rpc_timeout *timeparms,
867 u32 minorversion, unsigned int nconnect,
868 struct net *net)
869{
870 struct nfs_client_initdata cl_init = {
871 .hostname = hostname,
872 .addr = addr,
873 .addrlen = addrlen,
874 .ip_addr = ip_addr,
875 .nfs_mod = &nfs_v4,
876 .proto = proto,
877 .minorversion = minorversion,
878 .net = net,
879 .timeparms = timeparms,
880 .cred = server->cred,
881 };
882 struct nfs_client *clp;
883
884 if (minorversion == 0)
885 __set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags);
886 if (proto == XPRT_TRANSPORT_TCP)
887 cl_init.nconnect = nconnect;
888
889 if (server->flags & NFS_MOUNT_NORESVPORT)
890 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
891 if (server->options & NFS_OPTION_MIGRATION)
892 __set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
893 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
894 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
895 server->port = rpc_get_port(addr);
896
897 /* Allocate or find a client reference we can use */
898 clp = nfs_get_client(&cl_init);
899 if (IS_ERR(clp))
900 return PTR_ERR(clp);
901
902 if (server->nfs_client == clp) {
903 nfs_put_client(clp);
904 return -ELOOP;
905 }
906
907 /*
908 * Query for the lease time on clientid setup or renewal
909 *
910 * Note that this will be set on nfs_clients that were created
911 * only for the DS role and did not set this bit, but now will
912 * serve a dual role.
913 */
914 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
915
916 server->nfs_client = clp;
917 return 0;
918}
919
920/*
921 * Set up a pNFS Data Server client.
922 *
923 * Return any existing nfs_client that matches server address,port,version
924 * and minorversion.
925 *
926 * For a new nfs_client, use a soft mount (default), a low retrans and a
927 * low timeout interval so that if a connection is lost, we retry through
928 * the MDS.
929 */
930struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
931 const struct sockaddr *ds_addr, int ds_addrlen,
932 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
933 u32 minor_version)
934{
935 struct rpc_timeout ds_timeout;
936 struct nfs_client *mds_clp = mds_srv->nfs_client;
937 struct nfs_client_initdata cl_init = {
938 .addr = ds_addr,
939 .addrlen = ds_addrlen,
940 .nodename = mds_clp->cl_rpcclient->cl_nodename,
941 .ip_addr = mds_clp->cl_ipaddr,
942 .nfs_mod = &nfs_v4,
943 .proto = ds_proto,
944 .minorversion = minor_version,
945 .net = mds_clp->cl_net,
946 .timeparms = &ds_timeout,
947 .cred = mds_srv->cred,
948 };
949 char buf[INET6_ADDRSTRLEN + 1];
950
951 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
952 return ERR_PTR(-EINVAL);
953 cl_init.hostname = buf;
954
955 if (mds_clp->cl_nconnect > 1 && ds_proto == XPRT_TRANSPORT_TCP)
956 cl_init.nconnect = mds_clp->cl_nconnect;
957
958 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
959 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
960
961 /*
962 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
963 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
964 * (section 13.1 RFC 5661).
965 */
966 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
967 return nfs_get_client(&cl_init);
968}
969EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
970
971/*
972 * Session has been established, and the client marked ready.
973 * Limit the mount rsize, wsize and dtsize using negotiated fore
974 * channel attributes.
975 */
976static void nfs4_session_limit_rwsize(struct nfs_server *server)
977{
978#ifdef CONFIG_NFS_V4_1
979 struct nfs4_session *sess;
980 u32 server_resp_sz;
981 u32 server_rqst_sz;
982
983 if (!nfs4_has_session(server->nfs_client))
984 return;
985 sess = server->nfs_client->cl_session;
986 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
987 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
988
989 if (server->dtsize > server_resp_sz)
990 server->dtsize = server_resp_sz;
991 if (server->rsize > server_resp_sz)
992 server->rsize = server_resp_sz;
993 if (server->wsize > server_rqst_sz)
994 server->wsize = server_rqst_sz;
995#endif /* CONFIG_NFS_V4_1 */
996}
997
998/*
999 * Limit xattr sizes using the channel attributes.
1000 */
1001static void nfs4_session_limit_xasize(struct nfs_server *server)
1002{
1003#ifdef CONFIG_NFS_V4_2
1004 struct nfs4_session *sess;
1005 u32 server_gxa_sz;
1006 u32 server_sxa_sz;
1007 u32 server_lxa_sz;
1008
1009 if (!nfs4_has_session(server->nfs_client))
1010 return;
1011
1012 sess = server->nfs_client->cl_session;
1013
1014 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead;
1015 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead;
1016 server_lxa_sz = sess->fc_attrs.max_resp_sz -
1017 nfs42_maxlistxattrs_overhead;
1018
1019 if (server->gxasize > server_gxa_sz)
1020 server->gxasize = server_gxa_sz;
1021 if (server->sxasize > server_sxa_sz)
1022 server->sxasize = server_sxa_sz;
1023 if (server->lxasize > server_lxa_sz)
1024 server->lxasize = server_lxa_sz;
1025#endif
1026}
1027
1028static int nfs4_server_common_setup(struct nfs_server *server,
1029 struct nfs_fh *mntfh, bool auth_probe)
1030{
1031 struct nfs_fattr *fattr;
1032 int error;
1033
1034 /* data servers support only a subset of NFSv4.1 */
1035 if (is_ds_only_client(server->nfs_client))
1036 return -EPROTONOSUPPORT;
1037
1038 fattr = nfs_alloc_fattr();
1039 if (fattr == NULL)
1040 return -ENOMEM;
1041
1042 /* We must ensure the session is initialised first */
1043 error = nfs4_init_session(server->nfs_client);
1044 if (error < 0)
1045 goto out;
1046
1047 /* Set the basic capabilities */
1048 server->caps |= server->nfs_client->cl_mvops->init_caps;
1049 if (server->flags & NFS_MOUNT_NORDIRPLUS)
1050 server->caps &= ~NFS_CAP_READDIRPLUS;
1051 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA)
1052 server->caps &= ~NFS_CAP_READ_PLUS;
1053 /*
1054 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1055 * authentication.
1056 */
1057 if (nfs4_disable_idmapping &&
1058 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1059 server->caps |= NFS_CAP_UIDGID_NOMAP;
1060
1061
1062 /* Probe the root fh to retrieve its FSID and filehandle */
1063 error = nfs4_get_rootfh(server, mntfh, auth_probe);
1064 if (error < 0)
1065 goto out;
1066
1067 dprintk("Server FSID: %llx:%llx\n",
1068 (unsigned long long) server->fsid.major,
1069 (unsigned long long) server->fsid.minor);
1070 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1071
1072 error = nfs_probe_fsinfo(server, mntfh, fattr);
1073 if (error < 0)
1074 goto out;
1075
1076 nfs4_session_limit_rwsize(server);
1077 nfs4_session_limit_xasize(server);
1078
1079 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1080 server->namelen = NFS4_MAXNAMLEN;
1081
1082 nfs_server_insert_lists(server);
1083 server->mount_time = jiffies;
1084 server->destroy = nfs4_destroy_server;
1085out:
1086 nfs_free_fattr(fattr);
1087 return error;
1088}
1089
1090/*
1091 * Create a version 4 volume record
1092 */
1093static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
1094{
1095 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1096 struct rpc_timeout timeparms;
1097 int error;
1098
1099 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
1100 ctx->timeo, ctx->retrans);
1101
1102 /* Initialise the client representation from the mount data */
1103 server->flags = ctx->flags;
1104 server->options = ctx->options;
1105 server->auth_info = ctx->auth_info;
1106
1107 /* Use the first specified auth flavor. If this flavor isn't
1108 * allowed by the server, use the SECINFO path to try the
1109 * other specified flavors */
1110 if (ctx->auth_info.flavor_len >= 1)
1111 ctx->selected_flavor = ctx->auth_info.flavors[0];
1112 else
1113 ctx->selected_flavor = RPC_AUTH_UNIX;
1114
1115 /* Get a client record */
1116 error = nfs4_set_client(server,
1117 ctx->nfs_server.hostname,
1118 &ctx->nfs_server.address,
1119 ctx->nfs_server.addrlen,
1120 ctx->client_address,
1121 ctx->nfs_server.protocol,
1122 &timeparms,
1123 ctx->minorversion,
1124 ctx->nfs_server.nconnect,
1125 fc->net_ns);
1126 if (error < 0)
1127 return error;
1128
1129 if (ctx->rsize)
1130 server->rsize = nfs_block_size(ctx->rsize, NULL);
1131 if (ctx->wsize)
1132 server->wsize = nfs_block_size(ctx->wsize, NULL);
1133
1134 server->acregmin = ctx->acregmin * HZ;
1135 server->acregmax = ctx->acregmax * HZ;
1136 server->acdirmin = ctx->acdirmin * HZ;
1137 server->acdirmax = ctx->acdirmax * HZ;
1138 server->port = ctx->nfs_server.port;
1139
1140 return nfs_init_server_rpcclient(server, &timeparms,
1141 ctx->selected_flavor);
1142}
1143
1144/*
1145 * Create a version 4 volume record
1146 * - keyed on server and FSID
1147 */
1148struct nfs_server *nfs4_create_server(struct fs_context *fc)
1149{
1150 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1151 struct nfs_server *server;
1152 bool auth_probe;
1153 int error;
1154
1155 server = nfs_alloc_server();
1156 if (!server)
1157 return ERR_PTR(-ENOMEM);
1158
1159 server->cred = get_cred(fc->cred);
1160
1161 auth_probe = ctx->auth_info.flavor_len < 1;
1162
1163 /* set up the general RPC client */
1164 error = nfs4_init_server(server, fc);
1165 if (error < 0)
1166 goto error;
1167
1168 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1169 if (error < 0)
1170 goto error;
1171
1172 return server;
1173
1174error:
1175 nfs_free_server(server);
1176 return ERR_PTR(error);
1177}
1178
1179/*
1180 * Create an NFS4 referral server record
1181 */
1182struct nfs_server *nfs4_create_referral_server(struct fs_context *fc)
1183{
1184 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1185 struct nfs_client *parent_client;
1186 struct nfs_server *server, *parent_server;
1187 bool auth_probe;
1188 int error;
1189
1190 server = nfs_alloc_server();
1191 if (!server)
1192 return ERR_PTR(-ENOMEM);
1193
1194 parent_server = NFS_SB(ctx->clone_data.sb);
1195 parent_client = parent_server->nfs_client;
1196
1197 server->cred = get_cred(parent_server->cred);
1198
1199 /* Initialise the client representation from the parent server */
1200 nfs_server_copy_userdata(server, parent_server);
1201
1202 /* Get a client representation */
1203#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1204 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT);
1205 error = nfs4_set_client(server,
1206 ctx->nfs_server.hostname,
1207 &ctx->nfs_server.address,
1208 ctx->nfs_server.addrlen,
1209 parent_client->cl_ipaddr,
1210 XPRT_TRANSPORT_RDMA,
1211 parent_server->client->cl_timeout,
1212 parent_client->cl_mvops->minor_version,
1213 parent_client->cl_nconnect,
1214 parent_client->cl_net);
1215 if (!error)
1216 goto init_server;
1217#endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */
1218
1219 rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
1220 error = nfs4_set_client(server,
1221 ctx->nfs_server.hostname,
1222 &ctx->nfs_server.address,
1223 ctx->nfs_server.addrlen,
1224 parent_client->cl_ipaddr,
1225 XPRT_TRANSPORT_TCP,
1226 parent_server->client->cl_timeout,
1227 parent_client->cl_mvops->minor_version,
1228 parent_client->cl_nconnect,
1229 parent_client->cl_net);
1230 if (error < 0)
1231 goto error;
1232
1233#if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1234init_server:
1235#endif
1236 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
1237 ctx->selected_flavor);
1238 if (error < 0)
1239 goto error;
1240
1241 auth_probe = parent_server->auth_info.flavor_len < 1;
1242
1243 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1244 if (error < 0)
1245 goto error;
1246
1247 return server;
1248
1249error:
1250 nfs_free_server(server);
1251 return ERR_PTR(error);
1252}
1253
1254/*
1255 * Grab the destination's particulars, including lease expiry time.
1256 *
1257 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1258 * we have cached.
1259 */
1260static int nfs_probe_destination(struct nfs_server *server)
1261{
1262 struct inode *inode = d_inode(server->super->s_root);
1263 struct nfs_fattr *fattr;
1264 int error;
1265
1266 fattr = nfs_alloc_fattr();
1267 if (fattr == NULL)
1268 return -ENOMEM;
1269
1270 /* Sanity: the probe won't work if the destination server
1271 * does not recognize the migrated FH. */
1272 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1273
1274 nfs_free_fattr(fattr);
1275 return error;
1276}
1277
1278/**
1279 * nfs4_update_server - Move an nfs_server to a different nfs_client
1280 *
1281 * @server: represents FSID to be moved
1282 * @hostname: new end-point's hostname
1283 * @sap: new end-point's socket address
1284 * @salen: size of "sap"
1285 * @net: net namespace
1286 *
1287 * The nfs_server must be quiescent before this function is invoked.
1288 * Either its session is drained (NFSv4.1+), or its transport is
1289 * plugged and drained (NFSv4.0).
1290 *
1291 * Returns zero on success, or a negative errno value.
1292 */
1293int nfs4_update_server(struct nfs_server *server, const char *hostname,
1294 struct sockaddr *sap, size_t salen, struct net *net)
1295{
1296 struct nfs_client *clp = server->nfs_client;
1297 struct rpc_clnt *clnt = server->client;
1298 struct xprt_create xargs = {
1299 .ident = clp->cl_proto,
1300 .net = net,
1301 .dstaddr = sap,
1302 .addrlen = salen,
1303 .servername = hostname,
1304 };
1305 char buf[INET6_ADDRSTRLEN + 1];
1306 struct sockaddr_storage address;
1307 struct sockaddr *localaddr = (struct sockaddr *)&address;
1308 int error;
1309
1310 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1311 if (error != 0)
1312 return error;
1313
1314 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1315 if (error != 0)
1316 return error;
1317
1318 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1319 return -EAFNOSUPPORT;
1320
1321 nfs_server_remove_lists(server);
1322 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1323 error = nfs4_set_client(server, hostname, sap, salen, buf,
1324 clp->cl_proto, clnt->cl_timeout,
1325 clp->cl_minorversion,
1326 clp->cl_nconnect, net);
1327 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1328 if (error != 0) {
1329 nfs_server_insert_lists(server);
1330 return error;
1331 }
1332 nfs_put_client(clp);
1333
1334 if (server->nfs_client->cl_hostname == NULL)
1335 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1336 nfs_server_insert_lists(server);
1337
1338 return nfs_probe_destination(server);
1339}