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 */
nfs_get_cb_ident_idr(struct nfs_client * clp,int minorversion)28 static 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 */
49 struct 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 */
59 static struct nfs4_ds_server *
nfs4_find_ds_client(struct nfs_client * ds_clp,rpc_authflavor_t flavor)60 nfs4_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;
71 out:
72 rcu_read_unlock();
73 return dss;
74 }
75
76 static struct nfs4_ds_server *
nfs4_add_ds_client(struct nfs_client * ds_clp,rpc_authflavor_t flavor,struct nfs4_ds_server * new)77 nfs4_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;
91 out:
92 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
93 return dss;
94 }
95
96 static struct nfs4_ds_server *
nfs4_alloc_ds_server(struct nfs_client * ds_clp,rpc_authflavor_t flavor)97 nfs4_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
116 static void
nfs4_free_ds_server(struct nfs4_ds_server * dss)117 nfs4_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 */
131 struct rpc_clnt *
nfs4_find_or_create_ds_client(struct nfs_client * ds_clp,struct inode * inode)132 nfs4_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);
146 out:
147 return dss->rpc_clnt;
148 }
149 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
150
151 static void
nfs4_shutdown_ds_clients(struct nfs_client * clp)152 nfs4_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
165 static void
nfs4_cleanup_callback(struct nfs_client * clp)166 nfs4_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
nfs41_shutdown_client(struct nfs_client * clp)178 void 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
nfs40_shutdown_client(struct nfs_client * clp)190 void 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
nfs4_alloc_client(const struct nfs_client_initdata * cl_init)198 struct 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 if (test_bit(NFS_CS_DS, &cl_init->init_flags))
235 __set_bit(NFS_CS_DS, &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 strlcpy(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
270 error:
271 nfs_free_client(clp);
272 return ERR_PTR(err);
273 }
274
275 /*
276 * Destroy the NFS4 callback service
277 */
nfs4_destroy_callback(struct nfs_client * clp)278 static 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
nfs4_shutdown_client(struct nfs_client * clp)284 static 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
nfs4_free_client(struct nfs_client * clp)300 void 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 */
nfs4_init_callback(struct nfs_client * clp)309 static 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 */
nfs40_init_client(struct nfs_client * clp)339 int 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 */
nfs41_init_client(struct nfs_client * clp)368 int 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 */
nfs4_init_client_minor_version(struct nfs_client * clp)398 static 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
nfs4_add_trunk(struct nfs_client * clp,struct nfs_client * old)408 static 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 */
nfs4_init_client(struct nfs_client * clp,const struct nfs_client_initdata * cl_init)445 struct 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
478 error:
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 */
nfs4_swap_callback_idents(struct nfs_client * keep,struct nfs_client * drop)492 static 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
nfs4_match_client_owner_id(const struct nfs_client * clp1,const struct nfs_client * clp2)515 static 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
nfs4_same_verifier(nfs4_verifier * v1,nfs4_verifier * v2)523 static bool nfs4_same_verifier(nfs4_verifier *v1, nfs4_verifier *v2)
524 {
525 return memcmp(v1->data, v2->data, sizeof(v1->data)) == 0;
526 }
527
nfs4_match_client(struct nfs_client * pos,struct nfs_client * new,struct nfs_client ** prev,struct nfs_net * nn)528 static 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 */
nfs40_walk_client_list(struct nfs_client * new,struct nfs_client ** result,const struct cred * cred)585 int 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 */
623 found:
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 }
655 out_unlock:
656 spin_unlock(&nn->nfs_client_lock);
657
658 /* No match found. The server lost our clientid */
659 out:
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 */
668 bool
nfs4_check_serverowner_major_id(struct nfs41_server_owner * o1,struct nfs41_server_owner * o2)669 nfs4_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 */
680 static bool
nfs4_check_server_scope(struct nfs41_server_scope * s1,struct nfs41_server_scope * s2)681 nfs4_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 */
nfs4_detect_session_trunking(struct nfs_client * clp,struct nfs41_exchange_id_res * res,struct rpc_xprt * xprt)706 int 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;
732 out_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 */
nfs41_walk_client_list(struct nfs_client * new,struct nfs_client ** result,const struct cred * cred)752 int 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
781 found:
782 refcount_inc(&pos->cl_count);
783 *result = pos;
784 status = 0;
785 break;
786 }
787
788 out:
789 spin_unlock(&nn->nfs_client_lock);
790 nfs_put_client(prev);
791 return status;
792 }
793 #endif /* CONFIG_NFS_V4_1 */
794
nfs4_destroy_server(struct nfs_server * server)795 static 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 */
810 struct nfs_client *
nfs4_find_client_ident(struct net * net,int cb_ident)811 nfs4_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 */
nfs4_cb_match_client(const struct sockaddr * addr,struct nfs_client * clp,u32 minorversion)826 static 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 */
854 struct nfs_client *
nfs4_find_client_sessionid(struct net * net,const struct sockaddr * addr,struct nfs4_sessionid * sid,u32 minorversion)855 nfs4_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
884 struct nfs_client *
nfs4_find_client_sessionid(struct net * net,const struct sockaddr * addr,struct nfs4_sessionid * sid,u32 minorversion)885 nfs4_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 */
nfs4_set_client(struct nfs_server * server,const char * hostname,const struct sockaddr * addr,const size_t addrlen,const char * ip_addr,int proto,const struct rpc_timeout * timeparms,u32 minorversion,unsigned int nconnect,unsigned int max_connect,struct net * net)895 static int nfs4_set_client(struct nfs_server *server,
896 const char *hostname,
897 const struct sockaddr *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 {
905 struct nfs_client_initdata cl_init = {
906 .hostname = hostname,
907 .addr = addr,
908 .addrlen = addrlen,
909 .ip_addr = ip_addr,
910 .nfs_mod = &nfs_v4,
911 .proto = proto,
912 .minorversion = minorversion,
913 .net = net,
914 .timeparms = timeparms,
915 .cred = server->cred,
916 };
917 struct nfs_client *clp;
918
919 if (minorversion == 0)
920 __set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags);
921 else
922 cl_init.max_connect = max_connect;
923 if (proto == XPRT_TRANSPORT_TCP)
924 cl_init.nconnect = nconnect;
925
926 if (server->flags & NFS_MOUNT_NORESVPORT)
927 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
928 if (server->options & NFS_OPTION_MIGRATION)
929 __set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
930 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
931 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
932 server->port = rpc_get_port(addr);
933
934 /* Allocate or find a client reference we can use */
935 clp = nfs_get_client(&cl_init);
936 if (IS_ERR(clp))
937 return PTR_ERR(clp);
938
939 if (server->nfs_client == clp) {
940 nfs_put_client(clp);
941 return -ELOOP;
942 }
943
944 /*
945 * Query for the lease time on clientid setup or renewal
946 *
947 * Note that this will be set on nfs_clients that were created
948 * only for the DS role and did not set this bit, but now will
949 * serve a dual role.
950 */
951 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
952
953 server->nfs_client = clp;
954 return 0;
955 }
956
957 /*
958 * Set up a pNFS Data Server client.
959 *
960 * Return any existing nfs_client that matches server address,port,version
961 * and minorversion.
962 *
963 * For a new nfs_client, use a soft mount (default), a low retrans and a
964 * low timeout interval so that if a connection is lost, we retry through
965 * the MDS.
966 */
nfs4_set_ds_client(struct nfs_server * mds_srv,const struct sockaddr * ds_addr,int ds_addrlen,int ds_proto,unsigned int ds_timeo,unsigned int ds_retrans,u32 minor_version)967 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
968 const struct sockaddr *ds_addr, int ds_addrlen,
969 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
970 u32 minor_version)
971 {
972 struct rpc_timeout ds_timeout;
973 struct nfs_client *mds_clp = mds_srv->nfs_client;
974 struct nfs_client_initdata cl_init = {
975 .addr = ds_addr,
976 .addrlen = ds_addrlen,
977 .nodename = mds_clp->cl_rpcclient->cl_nodename,
978 .ip_addr = mds_clp->cl_ipaddr,
979 .nfs_mod = &nfs_v4,
980 .proto = ds_proto,
981 .minorversion = minor_version,
982 .net = mds_clp->cl_net,
983 .timeparms = &ds_timeout,
984 .cred = mds_srv->cred,
985 };
986 char buf[INET6_ADDRSTRLEN + 1];
987
988 if (rpc_ntop(ds_addr, buf, sizeof(buf)) <= 0)
989 return ERR_PTR(-EINVAL);
990 cl_init.hostname = buf;
991
992 if (mds_clp->cl_nconnect > 1 && ds_proto == XPRT_TRANSPORT_TCP) {
993 cl_init.nconnect = mds_clp->cl_nconnect;
994 cl_init.max_connect = NFS_MAX_TRANSPORTS;
995 }
996
997 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
998 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
999
1000 __set_bit(NFS_CS_DS, &cl_init.init_flags);
1001 __set_bit(NFS_CS_PNFS, &cl_init.init_flags);
1002 cl_init.max_connect = NFS_MAX_TRANSPORTS;
1003 /*
1004 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1005 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1006 * (section 13.1 RFC 5661).
1007 */
1008 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
1009 return nfs_get_client(&cl_init);
1010 }
1011 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1012
1013 /*
1014 * Session has been established, and the client marked ready.
1015 * Limit the mount rsize, wsize and dtsize using negotiated fore
1016 * channel attributes.
1017 */
nfs4_session_limit_rwsize(struct nfs_server * server)1018 static void nfs4_session_limit_rwsize(struct nfs_server *server)
1019 {
1020 #ifdef CONFIG_NFS_V4_1
1021 struct nfs4_session *sess;
1022 u32 server_resp_sz;
1023 u32 server_rqst_sz;
1024
1025 if (!nfs4_has_session(server->nfs_client))
1026 return;
1027 sess = server->nfs_client->cl_session;
1028 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1029 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1030
1031 if (server->dtsize > server_resp_sz)
1032 server->dtsize = server_resp_sz;
1033 if (server->rsize > server_resp_sz)
1034 server->rsize = server_resp_sz;
1035 if (server->wsize > server_rqst_sz)
1036 server->wsize = server_rqst_sz;
1037 #endif /* CONFIG_NFS_V4_1 */
1038 }
1039
1040 /*
1041 * Limit xattr sizes using the channel attributes.
1042 */
nfs4_session_limit_xasize(struct nfs_server * server)1043 static void nfs4_session_limit_xasize(struct nfs_server *server)
1044 {
1045 #ifdef CONFIG_NFS_V4_2
1046 struct nfs4_session *sess;
1047 u32 server_gxa_sz;
1048 u32 server_sxa_sz;
1049 u32 server_lxa_sz;
1050
1051 if (!nfs4_has_session(server->nfs_client))
1052 return;
1053
1054 sess = server->nfs_client->cl_session;
1055
1056 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead;
1057 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead;
1058 server_lxa_sz = sess->fc_attrs.max_resp_sz -
1059 nfs42_maxlistxattrs_overhead;
1060
1061 if (server->gxasize > server_gxa_sz)
1062 server->gxasize = server_gxa_sz;
1063 if (server->sxasize > server_sxa_sz)
1064 server->sxasize = server_sxa_sz;
1065 if (server->lxasize > server_lxa_sz)
1066 server->lxasize = server_lxa_sz;
1067 #endif
1068 }
1069
nfs4_server_common_setup(struct nfs_server * server,struct nfs_fh * mntfh,bool auth_probe)1070 static int nfs4_server_common_setup(struct nfs_server *server,
1071 struct nfs_fh *mntfh, bool auth_probe)
1072 {
1073 struct nfs_fattr *fattr;
1074 int error;
1075
1076 /* data servers support only a subset of NFSv4.1 */
1077 if (is_ds_only_client(server->nfs_client))
1078 return -EPROTONOSUPPORT;
1079
1080 fattr = nfs_alloc_fattr();
1081 if (fattr == NULL)
1082 return -ENOMEM;
1083
1084 /* We must ensure the session is initialised first */
1085 error = nfs4_init_session(server->nfs_client);
1086 if (error < 0)
1087 goto out;
1088
1089 /* Set the basic capabilities */
1090 server->caps |= server->nfs_client->cl_mvops->init_caps;
1091 if (server->flags & NFS_MOUNT_NORDIRPLUS)
1092 server->caps &= ~NFS_CAP_READDIRPLUS;
1093 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA)
1094 server->caps &= ~NFS_CAP_READ_PLUS;
1095 /*
1096 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1097 * authentication.
1098 */
1099 if (nfs4_disable_idmapping &&
1100 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1101 server->caps |= NFS_CAP_UIDGID_NOMAP;
1102
1103
1104 /* Probe the root fh to retrieve its FSID and filehandle */
1105 error = nfs4_get_rootfh(server, mntfh, auth_probe);
1106 if (error < 0)
1107 goto out;
1108
1109 dprintk("Server FSID: %llx:%llx\n",
1110 (unsigned long long) server->fsid.major,
1111 (unsigned long long) server->fsid.minor);
1112 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1113
1114 error = nfs_probe_fsinfo(server, mntfh, fattr);
1115 if (error < 0)
1116 goto out;
1117
1118 nfs4_session_limit_rwsize(server);
1119 nfs4_session_limit_xasize(server);
1120
1121 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1122 server->namelen = NFS4_MAXNAMLEN;
1123
1124 nfs_server_insert_lists(server);
1125 server->mount_time = jiffies;
1126 server->destroy = nfs4_destroy_server;
1127 out:
1128 nfs_free_fattr(fattr);
1129 return error;
1130 }
1131
1132 /*
1133 * Create a version 4 volume record
1134 */
nfs4_init_server(struct nfs_server * server,struct fs_context * fc)1135 static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
1136 {
1137 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1138 struct rpc_timeout timeparms;
1139 int error;
1140
1141 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
1142 ctx->timeo, ctx->retrans);
1143
1144 /* Initialise the client representation from the mount data */
1145 server->flags = ctx->flags;
1146 server->options = ctx->options;
1147 server->auth_info = ctx->auth_info;
1148
1149 /* Use the first specified auth flavor. If this flavor isn't
1150 * allowed by the server, use the SECINFO path to try the
1151 * other specified flavors */
1152 if (ctx->auth_info.flavor_len >= 1)
1153 ctx->selected_flavor = ctx->auth_info.flavors[0];
1154 else
1155 ctx->selected_flavor = RPC_AUTH_UNIX;
1156
1157 /* Get a client record */
1158 error = nfs4_set_client(server,
1159 ctx->nfs_server.hostname,
1160 &ctx->nfs_server.address,
1161 ctx->nfs_server.addrlen,
1162 ctx->client_address,
1163 ctx->nfs_server.protocol,
1164 &timeparms,
1165 ctx->minorversion,
1166 ctx->nfs_server.nconnect,
1167 ctx->nfs_server.max_connect,
1168 fc->net_ns);
1169 if (error < 0)
1170 return error;
1171
1172 if (ctx->rsize)
1173 server->rsize = nfs_block_size(ctx->rsize, NULL);
1174 if (ctx->wsize)
1175 server->wsize = nfs_block_size(ctx->wsize, NULL);
1176
1177 server->acregmin = ctx->acregmin * HZ;
1178 server->acregmax = ctx->acregmax * HZ;
1179 server->acdirmin = ctx->acdirmin * HZ;
1180 server->acdirmax = ctx->acdirmax * HZ;
1181 server->port = ctx->nfs_server.port;
1182
1183 return nfs_init_server_rpcclient(server, &timeparms,
1184 ctx->selected_flavor);
1185 }
1186
1187 /*
1188 * Create a version 4 volume record
1189 * - keyed on server and FSID
1190 */
nfs4_create_server(struct fs_context * fc)1191 struct nfs_server *nfs4_create_server(struct fs_context *fc)
1192 {
1193 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1194 struct nfs_server *server;
1195 bool auth_probe;
1196 int error;
1197
1198 server = nfs_alloc_server();
1199 if (!server)
1200 return ERR_PTR(-ENOMEM);
1201
1202 server->cred = get_cred(fc->cred);
1203
1204 auth_probe = ctx->auth_info.flavor_len < 1;
1205
1206 /* set up the general RPC client */
1207 error = nfs4_init_server(server, fc);
1208 if (error < 0)
1209 goto error;
1210
1211 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1212 if (error < 0)
1213 goto error;
1214
1215 return server;
1216
1217 error:
1218 nfs_free_server(server);
1219 return ERR_PTR(error);
1220 }
1221
1222 /*
1223 * Create an NFS4 referral server record
1224 */
nfs4_create_referral_server(struct fs_context * fc)1225 struct nfs_server *nfs4_create_referral_server(struct fs_context *fc)
1226 {
1227 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1228 struct nfs_client *parent_client;
1229 struct nfs_server *server, *parent_server;
1230 bool auth_probe;
1231 int error;
1232
1233 server = nfs_alloc_server();
1234 if (!server)
1235 return ERR_PTR(-ENOMEM);
1236
1237 parent_server = NFS_SB(ctx->clone_data.sb);
1238 parent_client = parent_server->nfs_client;
1239
1240 server->cred = get_cred(parent_server->cred);
1241
1242 /* Initialise the client representation from the parent server */
1243 nfs_server_copy_userdata(server, parent_server);
1244
1245 /* Get a client representation */
1246 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1247 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT);
1248 error = nfs4_set_client(server,
1249 ctx->nfs_server.hostname,
1250 &ctx->nfs_server.address,
1251 ctx->nfs_server.addrlen,
1252 parent_client->cl_ipaddr,
1253 XPRT_TRANSPORT_RDMA,
1254 parent_server->client->cl_timeout,
1255 parent_client->cl_mvops->minor_version,
1256 parent_client->cl_nconnect,
1257 parent_client->cl_max_connect,
1258 parent_client->cl_net);
1259 if (!error)
1260 goto init_server;
1261 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */
1262
1263 rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
1264 error = nfs4_set_client(server,
1265 ctx->nfs_server.hostname,
1266 &ctx->nfs_server.address,
1267 ctx->nfs_server.addrlen,
1268 parent_client->cl_ipaddr,
1269 XPRT_TRANSPORT_TCP,
1270 parent_server->client->cl_timeout,
1271 parent_client->cl_mvops->minor_version,
1272 parent_client->cl_nconnect,
1273 parent_client->cl_max_connect,
1274 parent_client->cl_net);
1275 if (error < 0)
1276 goto error;
1277
1278 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1279 init_server:
1280 #endif
1281 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
1282 ctx->selected_flavor);
1283 if (error < 0)
1284 goto error;
1285
1286 auth_probe = parent_server->auth_info.flavor_len < 1;
1287
1288 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1289 if (error < 0)
1290 goto error;
1291
1292 return server;
1293
1294 error:
1295 nfs_free_server(server);
1296 return ERR_PTR(error);
1297 }
1298
1299 /*
1300 * Grab the destination's particulars, including lease expiry time.
1301 *
1302 * Returns zero if probe succeeded and retrieved FSID matches the FSID
1303 * we have cached.
1304 */
nfs_probe_destination(struct nfs_server * server)1305 static int nfs_probe_destination(struct nfs_server *server)
1306 {
1307 struct inode *inode = d_inode(server->super->s_root);
1308 struct nfs_fattr *fattr;
1309 int error;
1310
1311 fattr = nfs_alloc_fattr();
1312 if (fattr == NULL)
1313 return -ENOMEM;
1314
1315 /* Sanity: the probe won't work if the destination server
1316 * does not recognize the migrated FH. */
1317 error = nfs_probe_fsinfo(server, NFS_FH(inode), fattr);
1318
1319 nfs_free_fattr(fattr);
1320 return error;
1321 }
1322
1323 /**
1324 * nfs4_update_server - Move an nfs_server to a different nfs_client
1325 *
1326 * @server: represents FSID to be moved
1327 * @hostname: new end-point's hostname
1328 * @sap: new end-point's socket address
1329 * @salen: size of "sap"
1330 * @net: net namespace
1331 *
1332 * The nfs_server must be quiescent before this function is invoked.
1333 * Either its session is drained (NFSv4.1+), or its transport is
1334 * plugged and drained (NFSv4.0).
1335 *
1336 * Returns zero on success, or a negative errno value.
1337 */
nfs4_update_server(struct nfs_server * server,const char * hostname,struct sockaddr * sap,size_t salen,struct net * net)1338 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1339 struct sockaddr *sap, size_t salen, struct net *net)
1340 {
1341 struct nfs_client *clp = server->nfs_client;
1342 struct rpc_clnt *clnt = server->client;
1343 struct xprt_create xargs = {
1344 .ident = clp->cl_proto,
1345 .net = net,
1346 .dstaddr = sap,
1347 .addrlen = salen,
1348 .servername = hostname,
1349 };
1350 char buf[INET6_ADDRSTRLEN + 1];
1351 struct sockaddr_storage address;
1352 struct sockaddr *localaddr = (struct sockaddr *)&address;
1353 int error;
1354
1355 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1356 if (error != 0)
1357 return error;
1358
1359 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1360 if (error != 0)
1361 return error;
1362
1363 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1364 return -EAFNOSUPPORT;
1365
1366 nfs_server_remove_lists(server);
1367 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1368 error = nfs4_set_client(server, hostname, sap, salen, buf,
1369 clp->cl_proto, clnt->cl_timeout,
1370 clp->cl_minorversion,
1371 clp->cl_nconnect, clp->cl_max_connect, net);
1372 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1373 if (error != 0) {
1374 nfs_server_insert_lists(server);
1375 return error;
1376 }
1377 nfs_put_client(clp);
1378
1379 if (server->nfs_client->cl_hostname == NULL) {
1380 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1381 if (server->nfs_client->cl_hostname == NULL)
1382 return -ENOMEM;
1383 }
1384 nfs_server_insert_lists(server);
1385
1386 return nfs_probe_destination(server);
1387 }
1388