1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 */
6 #include <linux/module.h>
7 #include <linux/nfs_fs.h>
8 #include <linux/nfs_mount.h>
9 #include <linux/sunrpc/addr.h>
10 #include <linux/sunrpc/auth.h>
11 #include <linux/sunrpc/xprt.h>
12 #include <linux/sunrpc/bc_xprt.h>
13 #include <linux/sunrpc/rpc_pipe_fs.h>
14 #include "internal.h"
15 #include "callback.h"
16 #include "delegation.h"
17 #include "nfs4session.h"
18 #include "nfs4idmap.h"
19 #include "pnfs.h"
20 #include "netns.h"
21 #include "sysfs.h"
22
23 #define NFSDBG_FACILITY NFSDBG_CLIENT
24
25 /*
26 * Get a unique NFSv4.0 callback identifier which will be used
27 * by the V4.0 callback service to lookup the nfs_client struct
28 */
nfs_get_cb_ident_idr(struct nfs_client * clp,int minorversion)29 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
30 {
31 int ret = 0;
32 struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
33
34 if (clp->rpc_ops->version != 4 || minorversion != 0)
35 return ret;
36 idr_preload(GFP_KERNEL);
37 spin_lock(&nn->nfs_client_lock);
38 ret = idr_alloc(&nn->cb_ident_idr, clp, 1, 0, GFP_NOWAIT);
39 if (ret >= 0)
40 clp->cl_cb_ident = ret;
41 spin_unlock(&nn->nfs_client_lock);
42 idr_preload_end();
43 return ret < 0 ? ret : 0;
44 }
45
46 #ifdef CONFIG_NFS_V4_1
47 /*
48 * Per auth flavor data server rpc clients
49 */
50 struct nfs4_ds_server {
51 struct list_head list; /* ds_clp->cl_ds_clients */
52 struct rpc_clnt *rpc_clnt;
53 };
54
55 /**
56 * nfs4_find_ds_client - Common lookup case for DS I/O
57 * @ds_clp: pointer to the DS's nfs_client
58 * @flavor: rpc auth flavour to match
59 */
60 static struct nfs4_ds_server *
nfs4_find_ds_client(struct nfs_client * ds_clp,rpc_authflavor_t flavor)61 nfs4_find_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
62 {
63 struct nfs4_ds_server *dss;
64
65 rcu_read_lock();
66 list_for_each_entry_rcu(dss, &ds_clp->cl_ds_clients, list) {
67 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
68 continue;
69 goto out;
70 }
71 dss = NULL;
72 out:
73 rcu_read_unlock();
74 return dss;
75 }
76
77 static struct nfs4_ds_server *
nfs4_add_ds_client(struct nfs_client * ds_clp,rpc_authflavor_t flavor,struct nfs4_ds_server * new)78 nfs4_add_ds_client(struct nfs_client *ds_clp, rpc_authflavor_t flavor,
79 struct nfs4_ds_server *new)
80 {
81 struct nfs4_ds_server *dss;
82
83 spin_lock(&ds_clp->cl_lock);
84 list_for_each_entry(dss, &ds_clp->cl_ds_clients, list) {
85 if (dss->rpc_clnt->cl_auth->au_flavor != flavor)
86 continue;
87 goto out;
88 }
89 if (new)
90 list_add_rcu(&new->list, &ds_clp->cl_ds_clients);
91 dss = new;
92 out:
93 spin_unlock(&ds_clp->cl_lock); /* need some lock to protect list */
94 return dss;
95 }
96
97 static struct nfs4_ds_server *
nfs4_alloc_ds_server(struct nfs_client * ds_clp,rpc_authflavor_t flavor)98 nfs4_alloc_ds_server(struct nfs_client *ds_clp, rpc_authflavor_t flavor)
99 {
100 struct nfs4_ds_server *dss;
101
102 dss = kmalloc(sizeof(*dss), GFP_NOFS);
103 if (dss == NULL)
104 return ERR_PTR(-ENOMEM);
105
106 dss->rpc_clnt = rpc_clone_client_set_auth(ds_clp->cl_rpcclient, flavor);
107 if (IS_ERR(dss->rpc_clnt)) {
108 int err = PTR_ERR(dss->rpc_clnt);
109 kfree (dss);
110 return ERR_PTR(err);
111 }
112 INIT_LIST_HEAD(&dss->list);
113
114 return dss;
115 }
116
117 static void
nfs4_free_ds_server(struct nfs4_ds_server * dss)118 nfs4_free_ds_server(struct nfs4_ds_server *dss)
119 {
120 rpc_release_client(dss->rpc_clnt);
121 kfree(dss);
122 }
123
124 /**
125 * nfs4_find_or_create_ds_client - Find or create a DS rpc client
126 * @ds_clp: pointer to the DS's nfs_client
127 * @inode: pointer to the inode
128 *
129 * Find or create a DS rpc client with th MDS server rpc client auth flavor
130 * in the nfs_client cl_ds_clients list.
131 */
132 struct rpc_clnt *
nfs4_find_or_create_ds_client(struct nfs_client * ds_clp,struct inode * inode)133 nfs4_find_or_create_ds_client(struct nfs_client *ds_clp, struct inode *inode)
134 {
135 struct nfs4_ds_server *dss, *new;
136 rpc_authflavor_t flavor = NFS_SERVER(inode)->client->cl_auth->au_flavor;
137
138 dss = nfs4_find_ds_client(ds_clp, flavor);
139 if (dss != NULL)
140 goto out;
141 new = nfs4_alloc_ds_server(ds_clp, flavor);
142 if (IS_ERR(new))
143 return ERR_CAST(new);
144 dss = nfs4_add_ds_client(ds_clp, flavor, new);
145 if (dss != new)
146 nfs4_free_ds_server(new);
147 out:
148 return dss->rpc_clnt;
149 }
150 EXPORT_SYMBOL_GPL(nfs4_find_or_create_ds_client);
151
152 static void
nfs4_shutdown_ds_clients(struct nfs_client * clp)153 nfs4_shutdown_ds_clients(struct nfs_client *clp)
154 {
155 struct nfs4_ds_server *dss;
156
157 while (!list_empty(&clp->cl_ds_clients)) {
158 dss = list_entry(clp->cl_ds_clients.next,
159 struct nfs4_ds_server, list);
160 list_del(&dss->list);
161 rpc_shutdown_client(dss->rpc_clnt);
162 kfree (dss);
163 }
164 }
165
166 static void
nfs4_cleanup_callback(struct nfs_client * clp)167 nfs4_cleanup_callback(struct nfs_client *clp)
168 {
169 struct nfs4_copy_state *cp_state;
170
171 while (!list_empty(&clp->pending_cb_stateids)) {
172 cp_state = list_entry(clp->pending_cb_stateids.next,
173 struct nfs4_copy_state, copies);
174 list_del(&cp_state->copies);
175 kfree(cp_state);
176 }
177 }
178
nfs41_shutdown_client(struct nfs_client * clp)179 void nfs41_shutdown_client(struct nfs_client *clp)
180 {
181 if (nfs4_has_session(clp)) {
182 nfs4_cleanup_callback(clp);
183 nfs4_shutdown_ds_clients(clp);
184 nfs4_destroy_session(clp->cl_session);
185 nfs4_destroy_clientid(clp);
186 }
187
188 }
189 #endif /* CONFIG_NFS_V4_1 */
190
nfs40_shutdown_client(struct nfs_client * clp)191 void nfs40_shutdown_client(struct nfs_client *clp)
192 {
193 if (clp->cl_slot_tbl) {
194 nfs4_shutdown_slot_table(clp->cl_slot_tbl);
195 kfree(clp->cl_slot_tbl);
196 }
197 }
198
nfs4_alloc_client(const struct nfs_client_initdata * cl_init)199 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
200 {
201 char buf[INET6_ADDRSTRLEN + 1];
202 const char *ip_addr = cl_init->ip_addr;
203 struct nfs_client *clp = nfs_alloc_client(cl_init);
204 int err;
205
206 if (IS_ERR(clp))
207 return clp;
208
209 err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
210 if (err)
211 goto error;
212
213 if (cl_init->minorversion > NFS4_MAX_MINOR_VERSION) {
214 err = -EINVAL;
215 goto error;
216 }
217
218 spin_lock_init(&clp->cl_lock);
219 INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
220 INIT_LIST_HEAD(&clp->cl_ds_clients);
221 rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
222 clp->cl_state = 1 << NFS4CLNT_LEASE_EXPIRED;
223 clp->cl_mvops = nfs_v4_minor_ops[cl_init->minorversion];
224 clp->cl_mig_gen = 1;
225 #if IS_ENABLED(CONFIG_NFS_V4_1)
226 init_waitqueue_head(&clp->cl_lock_waitq);
227 #endif
228 INIT_LIST_HEAD(&clp->pending_cb_stateids);
229
230 if (cl_init->minorversion != 0)
231 __set_bit(NFS_CS_INFINITE_SLOTS, &clp->cl_flags);
232 __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags);
233 __set_bit(NFS_CS_NO_RETRANS_TIMEOUT, &clp->cl_flags);
234 if (test_bit(NFS_CS_PNFS, &cl_init->init_flags))
235 __set_bit(NFS_CS_PNFS, &clp->cl_flags);
236 /*
237 * Set up the connection to the server before we add add to the
238 * global list.
239 */
240 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_GSS_KRB5I);
241 if (err == -EINVAL)
242 err = nfs_create_rpc_client(clp, cl_init, RPC_AUTH_UNIX);
243 if (err < 0)
244 goto error;
245
246 /* If no clientaddr= option was specified, find a usable cb address */
247 if (ip_addr == NULL) {
248 struct sockaddr_storage cb_addr;
249 struct sockaddr *sap = (struct sockaddr *)&cb_addr;
250
251 err = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr));
252 if (err < 0)
253 goto error;
254 err = rpc_ntop(sap, buf, sizeof(buf));
255 if (err < 0)
256 goto error;
257 ip_addr = (const char *)buf;
258 }
259 strscpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr));
260
261 err = nfs_idmap_new(clp);
262 if (err < 0) {
263 dprintk("%s: failed to create idmapper. Error = %d\n",
264 __func__, err);
265 goto error;
266 }
267 __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
268 return clp;
269
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_storage * 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,struct xprtsec_parms * xprtsec)895 static int nfs4_set_client(struct nfs_server *server,
896 const char *hostname,
897 const struct sockaddr_storage *addr,
898 const size_t addrlen,
899 const char *ip_addr,
900 int proto, const struct rpc_timeout *timeparms,
901 u32 minorversion, unsigned int nconnect,
902 unsigned int max_connect,
903 struct net *net,
904 struct xprtsec_parms *xprtsec)
905 {
906 struct nfs_client_initdata cl_init = {
907 .hostname = hostname,
908 .addr = addr,
909 .addrlen = addrlen,
910 .ip_addr = ip_addr,
911 .nfs_mod = &nfs_v4,
912 .proto = proto,
913 .minorversion = minorversion,
914 .net = net,
915 .timeparms = timeparms,
916 .cred = server->cred,
917 .xprtsec = *xprtsec,
918 };
919 struct nfs_client *clp;
920
921 if (minorversion == 0)
922 __set_bit(NFS_CS_REUSEPORT, &cl_init.init_flags);
923 else
924 cl_init.max_connect = max_connect;
925 switch (proto) {
926 case XPRT_TRANSPORT_TCP:
927 case XPRT_TRANSPORT_TCP_TLS:
928 cl_init.nconnect = nconnect;
929 }
930
931 if (server->flags & NFS_MOUNT_NORESVPORT)
932 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
933 if (server->options & NFS_OPTION_MIGRATION)
934 __set_bit(NFS_CS_MIGRATION, &cl_init.init_flags);
935 if (test_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status))
936 __set_bit(NFS_CS_TSM_POSSIBLE, &cl_init.init_flags);
937 server->port = rpc_get_port((struct sockaddr *)addr);
938
939 /* Allocate or find a client reference we can use */
940 clp = nfs_get_client(&cl_init);
941 if (IS_ERR(clp))
942 return PTR_ERR(clp);
943
944 if (server->nfs_client == clp) {
945 nfs_put_client(clp);
946 return -ELOOP;
947 }
948
949 /*
950 * Query for the lease time on clientid setup or renewal
951 *
952 * Note that this will be set on nfs_clients that were created
953 * only for the DS role and did not set this bit, but now will
954 * serve a dual role.
955 */
956 set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
957
958 server->nfs_client = clp;
959 nfs_sysfs_add_server(server);
960 nfs_sysfs_link_rpc_client(server, clp->cl_rpcclient, "_state");
961
962 return 0;
963 }
964
965 /*
966 * Set up a pNFS Data Server client.
967 *
968 * Return any existing nfs_client that matches server address,port,version
969 * and minorversion.
970 *
971 * For a new nfs_client, use a soft mount (default), a low retrans and a
972 * low timeout interval so that if a connection is lost, we retry through
973 * the MDS.
974 */
nfs4_set_ds_client(struct nfs_server * mds_srv,const struct sockaddr_storage * ds_addr,int ds_addrlen,int ds_proto,unsigned int ds_timeo,unsigned int ds_retrans,u32 minor_version)975 struct nfs_client *nfs4_set_ds_client(struct nfs_server *mds_srv,
976 const struct sockaddr_storage *ds_addr, int ds_addrlen,
977 int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans,
978 u32 minor_version)
979 {
980 struct rpc_timeout ds_timeout;
981 struct nfs_client *mds_clp = mds_srv->nfs_client;
982 struct nfs_client_initdata cl_init = {
983 .addr = ds_addr,
984 .addrlen = ds_addrlen,
985 .nodename = mds_clp->cl_rpcclient->cl_nodename,
986 .ip_addr = mds_clp->cl_ipaddr,
987 .nfs_mod = &nfs_v4,
988 .proto = ds_proto,
989 .minorversion = minor_version,
990 .net = mds_clp->cl_net,
991 .timeparms = &ds_timeout,
992 .cred = mds_srv->cred,
993 .xprtsec = mds_srv->nfs_client->cl_xprtsec,
994 };
995 char buf[INET6_ADDRSTRLEN + 1];
996
997 if (rpc_ntop((struct sockaddr *)ds_addr, buf, sizeof(buf)) <= 0)
998 return ERR_PTR(-EINVAL);
999 cl_init.hostname = buf;
1000
1001 switch (ds_proto) {
1002 case XPRT_TRANSPORT_TCP:
1003 case XPRT_TRANSPORT_TCP_TLS:
1004 if (mds_clp->cl_nconnect > 1) {
1005 cl_init.nconnect = mds_clp->cl_nconnect;
1006 cl_init.max_connect = NFS_MAX_TRANSPORTS;
1007 }
1008 }
1009
1010 if (mds_srv->flags & NFS_MOUNT_NORESVPORT)
1011 __set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags);
1012
1013 __set_bit(NFS_CS_PNFS, &cl_init.init_flags);
1014 cl_init.max_connect = NFS_MAX_TRANSPORTS;
1015 /*
1016 * Set an authflavor equual to the MDS value. Use the MDS nfs_client
1017 * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS
1018 * (section 13.1 RFC 5661).
1019 */
1020 nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans);
1021 return nfs_get_client(&cl_init);
1022 }
1023 EXPORT_SYMBOL_GPL(nfs4_set_ds_client);
1024
1025 /*
1026 * Session has been established, and the client marked ready.
1027 * Limit the mount rsize, wsize and dtsize using negotiated fore
1028 * channel attributes.
1029 */
nfs4_session_limit_rwsize(struct nfs_server * server)1030 static void nfs4_session_limit_rwsize(struct nfs_server *server)
1031 {
1032 #ifdef CONFIG_NFS_V4_1
1033 struct nfs4_session *sess;
1034 u32 server_resp_sz;
1035 u32 server_rqst_sz;
1036
1037 if (!nfs4_has_session(server->nfs_client))
1038 return;
1039 sess = server->nfs_client->cl_session;
1040 server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead;
1041 server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead;
1042
1043 if (server->dtsize > server_resp_sz)
1044 server->dtsize = server_resp_sz;
1045 if (server->rsize > server_resp_sz)
1046 server->rsize = server_resp_sz;
1047 if (server->wsize > server_rqst_sz)
1048 server->wsize = server_rqst_sz;
1049 #endif /* CONFIG_NFS_V4_1 */
1050 }
1051
1052 /*
1053 * Limit xattr sizes using the channel attributes.
1054 */
nfs4_session_limit_xasize(struct nfs_server * server)1055 static void nfs4_session_limit_xasize(struct nfs_server *server)
1056 {
1057 #ifdef CONFIG_NFS_V4_2
1058 struct nfs4_session *sess;
1059 u32 server_gxa_sz;
1060 u32 server_sxa_sz;
1061 u32 server_lxa_sz;
1062
1063 if (!nfs4_has_session(server->nfs_client))
1064 return;
1065
1066 sess = server->nfs_client->cl_session;
1067
1068 server_gxa_sz = sess->fc_attrs.max_resp_sz - nfs42_maxgetxattr_overhead;
1069 server_sxa_sz = sess->fc_attrs.max_rqst_sz - nfs42_maxsetxattr_overhead;
1070 server_lxa_sz = sess->fc_attrs.max_resp_sz -
1071 nfs42_maxlistxattrs_overhead;
1072
1073 if (server->gxasize > server_gxa_sz)
1074 server->gxasize = server_gxa_sz;
1075 if (server->sxasize > server_sxa_sz)
1076 server->sxasize = server_sxa_sz;
1077 if (server->lxasize > server_lxa_sz)
1078 server->lxasize = server_lxa_sz;
1079 #endif
1080 }
1081
nfs4_server_set_init_caps(struct nfs_server * server)1082 void nfs4_server_set_init_caps(struct nfs_server *server)
1083 {
1084 /* Set the basic capabilities */
1085 server->caps |= server->nfs_client->cl_mvops->init_caps;
1086 if (server->flags & NFS_MOUNT_NORDIRPLUS)
1087 server->caps &= ~NFS_CAP_READDIRPLUS;
1088 if (server->nfs_client->cl_proto == XPRT_TRANSPORT_RDMA)
1089 server->caps &= ~NFS_CAP_READ_PLUS;
1090
1091 /*
1092 * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower
1093 * authentication.
1094 */
1095 if (nfs4_disable_idmapping &&
1096 server->client->cl_auth->au_flavor == RPC_AUTH_UNIX)
1097 server->caps |= NFS_CAP_UIDGID_NOMAP;
1098 }
1099
nfs4_server_common_setup(struct nfs_server * server,struct nfs_fh * mntfh,bool auth_probe)1100 static int nfs4_server_common_setup(struct nfs_server *server,
1101 struct nfs_fh *mntfh, bool auth_probe)
1102 {
1103 int error;
1104
1105 /* data servers support only a subset of NFSv4.1 */
1106 if (is_ds_only_client(server->nfs_client))
1107 return -EPROTONOSUPPORT;
1108
1109 /* We must ensure the session is initialised first */
1110 error = nfs4_init_session(server->nfs_client);
1111 if (error < 0)
1112 goto out;
1113
1114 nfs4_server_set_init_caps(server);
1115
1116 /* Probe the root fh to retrieve its FSID and filehandle */
1117 error = nfs4_get_rootfh(server, mntfh, auth_probe);
1118 if (error < 0)
1119 goto out;
1120
1121 dprintk("Server FSID: %llx:%llx\n",
1122 (unsigned long long) server->fsid.major,
1123 (unsigned long long) server->fsid.minor);
1124 nfs_display_fhandle(mntfh, "Pseudo-fs root FH");
1125
1126 error = nfs_probe_server(server, mntfh);
1127 if (error < 0)
1128 goto out;
1129
1130 nfs4_session_limit_rwsize(server);
1131 nfs4_session_limit_xasize(server);
1132
1133 if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN)
1134 server->namelen = NFS4_MAXNAMLEN;
1135
1136 nfs_server_insert_lists(server);
1137 server->mount_time = jiffies;
1138 server->destroy = nfs4_destroy_server;
1139 out:
1140 return error;
1141 }
1142
1143 /*
1144 * Create a version 4 volume record
1145 */
nfs4_init_server(struct nfs_server * server,struct fs_context * fc)1146 static int nfs4_init_server(struct nfs_server *server, struct fs_context *fc)
1147 {
1148 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1149 struct rpc_timeout timeparms;
1150 int error;
1151
1152 nfs_init_timeout_values(&timeparms, ctx->nfs_server.protocol,
1153 ctx->timeo, ctx->retrans);
1154
1155 /* Initialise the client representation from the mount data */
1156 server->flags = ctx->flags;
1157 server->options = ctx->options;
1158 server->auth_info = ctx->auth_info;
1159
1160 /* Use the first specified auth flavor. If this flavor isn't
1161 * allowed by the server, use the SECINFO path to try the
1162 * other specified flavors */
1163 if (ctx->auth_info.flavor_len >= 1)
1164 ctx->selected_flavor = ctx->auth_info.flavors[0];
1165 else
1166 ctx->selected_flavor = RPC_AUTH_UNIX;
1167
1168 /* Get a client record */
1169 error = nfs4_set_client(server,
1170 ctx->nfs_server.hostname,
1171 &ctx->nfs_server._address,
1172 ctx->nfs_server.addrlen,
1173 ctx->client_address,
1174 ctx->nfs_server.protocol,
1175 &timeparms,
1176 ctx->minorversion,
1177 ctx->nfs_server.nconnect,
1178 ctx->nfs_server.max_connect,
1179 fc->net_ns,
1180 &ctx->xprtsec);
1181 if (error < 0)
1182 return error;
1183
1184 if (ctx->rsize)
1185 server->rsize = nfs_io_size(ctx->rsize, server->nfs_client->cl_proto);
1186 if (ctx->wsize)
1187 server->wsize = nfs_io_size(ctx->wsize, server->nfs_client->cl_proto);
1188
1189 server->acregmin = ctx->acregmin * HZ;
1190 server->acregmax = ctx->acregmax * HZ;
1191 server->acdirmin = ctx->acdirmin * HZ;
1192 server->acdirmax = ctx->acdirmax * HZ;
1193 server->port = ctx->nfs_server.port;
1194
1195 return nfs_init_server_rpcclient(server, &timeparms,
1196 ctx->selected_flavor);
1197 }
1198
1199 /*
1200 * Create a version 4 volume record
1201 * - keyed on server and FSID
1202 */
nfs4_create_server(struct fs_context * fc)1203 struct nfs_server *nfs4_create_server(struct fs_context *fc)
1204 {
1205 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1206 struct nfs_server *server;
1207 bool auth_probe;
1208 int error;
1209
1210 server = nfs_alloc_server();
1211 if (!server)
1212 return ERR_PTR(-ENOMEM);
1213
1214 server->cred = get_cred(fc->cred);
1215
1216 auth_probe = ctx->auth_info.flavor_len < 1;
1217
1218 /* set up the general RPC client */
1219 error = nfs4_init_server(server, fc);
1220 if (error < 0)
1221 goto error;
1222
1223 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1224 if (error < 0)
1225 goto error;
1226
1227 return server;
1228
1229 error:
1230 nfs_free_server(server);
1231 return ERR_PTR(error);
1232 }
1233
1234 /*
1235 * Create an NFS4 referral server record
1236 */
nfs4_create_referral_server(struct fs_context * fc)1237 struct nfs_server *nfs4_create_referral_server(struct fs_context *fc)
1238 {
1239 struct nfs_fs_context *ctx = nfs_fc2context(fc);
1240 struct nfs_client *parent_client;
1241 struct nfs_server *server, *parent_server;
1242 int proto, error;
1243 bool auth_probe;
1244
1245 server = nfs_alloc_server();
1246 if (!server)
1247 return ERR_PTR(-ENOMEM);
1248
1249 parent_server = NFS_SB(ctx->clone_data.sb);
1250 parent_client = parent_server->nfs_client;
1251
1252 server->cred = get_cred(parent_server->cred);
1253
1254 /* Initialise the client representation from the parent server */
1255 nfs_server_copy_userdata(server, parent_server);
1256
1257 /* Get a client representation */
1258 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1259 rpc_set_port(&ctx->nfs_server.address, NFS_RDMA_PORT);
1260 error = nfs4_set_client(server,
1261 ctx->nfs_server.hostname,
1262 &ctx->nfs_server._address,
1263 ctx->nfs_server.addrlen,
1264 parent_client->cl_ipaddr,
1265 XPRT_TRANSPORT_RDMA,
1266 parent_server->client->cl_timeout,
1267 parent_client->cl_mvops->minor_version,
1268 parent_client->cl_nconnect,
1269 parent_client->cl_max_connect,
1270 parent_client->cl_net,
1271 &parent_client->cl_xprtsec);
1272 if (!error)
1273 goto init_server;
1274 #endif /* IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA) */
1275
1276 proto = XPRT_TRANSPORT_TCP;
1277 if (parent_client->cl_xprtsec.policy != RPC_XPRTSEC_NONE)
1278 proto = XPRT_TRANSPORT_TCP_TLS;
1279 rpc_set_port(&ctx->nfs_server.address, NFS_PORT);
1280 error = nfs4_set_client(server,
1281 ctx->nfs_server.hostname,
1282 &ctx->nfs_server._address,
1283 ctx->nfs_server.addrlen,
1284 parent_client->cl_ipaddr,
1285 proto,
1286 parent_server->client->cl_timeout,
1287 parent_client->cl_mvops->minor_version,
1288 parent_client->cl_nconnect,
1289 parent_client->cl_max_connect,
1290 parent_client->cl_net,
1291 &parent_client->cl_xprtsec);
1292 if (error < 0)
1293 goto error;
1294
1295 #if IS_ENABLED(CONFIG_SUNRPC_XPRT_RDMA)
1296 init_server:
1297 #endif
1298 error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout,
1299 ctx->selected_flavor);
1300 if (error < 0)
1301 goto error;
1302
1303 auth_probe = parent_server->auth_info.flavor_len < 1;
1304
1305 error = nfs4_server_common_setup(server, ctx->mntfh, auth_probe);
1306 if (error < 0)
1307 goto error;
1308
1309 return server;
1310
1311 error:
1312 nfs_free_server(server);
1313 return ERR_PTR(error);
1314 }
1315
1316 /**
1317 * nfs4_update_server - Move an nfs_server to a different nfs_client
1318 *
1319 * @server: represents FSID to be moved
1320 * @hostname: new end-point's hostname
1321 * @sap: new end-point's socket address
1322 * @salen: size of "sap"
1323 * @net: net namespace
1324 *
1325 * The nfs_server must be quiescent before this function is invoked.
1326 * Either its session is drained (NFSv4.1+), or its transport is
1327 * plugged and drained (NFSv4.0).
1328 *
1329 * Returns zero on success, or a negative errno value.
1330 */
nfs4_update_server(struct nfs_server * server,const char * hostname,struct sockaddr_storage * sap,size_t salen,struct net * net)1331 int nfs4_update_server(struct nfs_server *server, const char *hostname,
1332 struct sockaddr_storage *sap, size_t salen, struct net *net)
1333 {
1334 struct nfs_client *clp = server->nfs_client;
1335 struct rpc_clnt *clnt = server->client;
1336 struct xprt_create xargs = {
1337 .ident = clp->cl_proto,
1338 .net = net,
1339 .dstaddr = (struct sockaddr *)sap,
1340 .addrlen = salen,
1341 .servername = hostname,
1342 /* cel: bleh. We might need to pass TLS parameters here */
1343 };
1344 char buf[INET6_ADDRSTRLEN + 1];
1345 struct sockaddr_storage address;
1346 struct sockaddr *localaddr = (struct sockaddr *)&address;
1347 int error;
1348
1349 error = rpc_switch_client_transport(clnt, &xargs, clnt->cl_timeout);
1350 if (error != 0)
1351 return error;
1352
1353 error = rpc_localaddr(clnt, localaddr, sizeof(address));
1354 if (error != 0)
1355 return error;
1356
1357 if (rpc_ntop(localaddr, buf, sizeof(buf)) == 0)
1358 return -EAFNOSUPPORT;
1359
1360 nfs_server_remove_lists(server);
1361 set_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1362 error = nfs4_set_client(server, hostname, sap, salen, buf,
1363 clp->cl_proto, clnt->cl_timeout,
1364 clp->cl_minorversion,
1365 clp->cl_nconnect, clp->cl_max_connect,
1366 net, &clp->cl_xprtsec);
1367 clear_bit(NFS_MIG_TSM_POSSIBLE, &server->mig_status);
1368 if (error != 0) {
1369 nfs_server_insert_lists(server);
1370 return error;
1371 }
1372 nfs_put_client(clp);
1373
1374 if (server->nfs_client->cl_hostname == NULL) {
1375 server->nfs_client->cl_hostname = kstrdup(hostname, GFP_KERNEL);
1376 if (server->nfs_client->cl_hostname == NULL)
1377 return -ENOMEM;
1378 }
1379 nfs_server_insert_lists(server);
1380
1381 return nfs_probe_server(server, NFS_FH(d_inode(server->super->s_root)));
1382 }
1383