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428360d7 BS |
1 | /* |
2 | * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. | |
3 | * Written by David Howells (dhowells@redhat.com) | |
4 | */ | |
fcf10398 | 5 | #include <linux/module.h> |
428360d7 BS |
6 | #include <linux/nfs_fs.h> |
7 | #include <linux/nfs_idmap.h> | |
fcf10398 | 8 | #include <linux/nfs_mount.h> |
428360d7 BS |
9 | #include <linux/sunrpc/auth.h> |
10 | #include <linux/sunrpc/xprt.h> | |
11 | #include <linux/sunrpc/bc_xprt.h> | |
12 | #include "internal.h" | |
13 | #include "callback.h" | |
fcf10398 BS |
14 | #include "delegation.h" |
15 | #include "pnfs.h" | |
16 | #include "netns.h" | |
428360d7 BS |
17 | |
18 | #define NFSDBG_FACILITY NFSDBG_CLIENT | |
19 | ||
fcf10398 BS |
20 | /* |
21 | * Turn off NFSv4 uid/gid mapping when using AUTH_SYS | |
22 | */ | |
23 | static bool nfs4_disable_idmapping = true; | |
24 | ||
428360d7 BS |
25 | /* |
26 | * Initialize the NFS4 callback service | |
27 | */ | |
28 | static int nfs4_init_callback(struct nfs_client *clp) | |
29 | { | |
30 | int error; | |
31 | ||
32 | if (clp->rpc_ops->version == 4) { | |
33 | struct rpc_xprt *xprt; | |
34 | ||
35 | xprt = rcu_dereference_raw(clp->cl_rpcclient->cl_xprt); | |
36 | ||
37 | if (nfs4_has_session(clp)) { | |
38 | error = xprt_setup_backchannel(xprt, | |
39 | NFS41_BC_MIN_CALLBACKS); | |
40 | if (error < 0) | |
41 | return error; | |
42 | } | |
43 | ||
44 | error = nfs_callback_up(clp->cl_mvops->minor_version, xprt); | |
45 | if (error < 0) { | |
46 | dprintk("%s: failed to start callback. Error = %d\n", | |
47 | __func__, error); | |
48 | return error; | |
49 | } | |
50 | __set_bit(NFS_CS_CALLBACK, &clp->cl_res_state); | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | ||
55 | /* | |
56 | * Initialize the minor version specific parts of an NFS4 client record | |
57 | */ | |
58 | static int nfs4_init_client_minor_version(struct nfs_client *clp) | |
59 | { | |
60 | #if defined(CONFIG_NFS_V4_1) | |
61 | if (clp->cl_mvops->minor_version) { | |
62 | struct nfs4_session *session = NULL; | |
63 | /* | |
64 | * Create the session and mark it expired. | |
65 | * When a SEQUENCE operation encounters the expired session | |
66 | * it will do session recovery to initialize it. | |
67 | */ | |
68 | session = nfs4_alloc_session(clp); | |
69 | if (!session) | |
70 | return -ENOMEM; | |
71 | ||
72 | clp->cl_session = session; | |
73 | /* | |
74 | * The create session reply races with the server back | |
75 | * channel probe. Mark the client NFS_CS_SESSION_INITING | |
76 | * so that the client back channel can find the | |
77 | * nfs_client struct | |
78 | */ | |
79 | nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING); | |
80 | } | |
81 | #endif /* CONFIG_NFS_V4_1 */ | |
82 | ||
83 | return nfs4_init_callback(clp); | |
84 | } | |
85 | ||
86 | /** | |
87 | * nfs4_init_client - Initialise an NFS4 client record | |
88 | * | |
89 | * @clp: nfs_client to initialise | |
90 | * @timeparms: timeout parameters for underlying RPC transport | |
91 | * @ip_addr: callback IP address in presentation format | |
92 | * @authflavor: authentication flavor for underlying RPC transport | |
93 | * | |
94 | * Returns pointer to an NFS client, or an ERR_PTR value. | |
95 | */ | |
96 | struct nfs_client *nfs4_init_client(struct nfs_client *clp, | |
97 | const struct rpc_timeout *timeparms, | |
98 | const char *ip_addr, | |
99 | rpc_authflavor_t authflavour) | |
100 | { | |
101 | char buf[INET6_ADDRSTRLEN + 1]; | |
102 | int error; | |
103 | ||
104 | if (clp->cl_cons_state == NFS_CS_READY) { | |
105 | /* the client is initialised already */ | |
106 | dprintk("<-- nfs4_init_client() = 0 [already %p]\n", clp); | |
107 | return clp; | |
108 | } | |
109 | ||
110 | /* Check NFS protocol revision and initialize RPC op vector */ | |
111 | clp->rpc_ops = &nfs_v4_clientops; | |
112 | ||
113 | __set_bit(NFS_CS_DISCRTRY, &clp->cl_flags); | |
114 | error = nfs_create_rpc_client(clp, timeparms, authflavour); | |
115 | if (error < 0) | |
116 | goto error; | |
117 | ||
118 | /* If no clientaddr= option was specified, find a usable cb address */ | |
119 | if (ip_addr == NULL) { | |
120 | struct sockaddr_storage cb_addr; | |
121 | struct sockaddr *sap = (struct sockaddr *)&cb_addr; | |
122 | ||
123 | error = rpc_localaddr(clp->cl_rpcclient, sap, sizeof(cb_addr)); | |
124 | if (error < 0) | |
125 | goto error; | |
126 | error = rpc_ntop(sap, buf, sizeof(buf)); | |
127 | if (error < 0) | |
128 | goto error; | |
129 | ip_addr = (const char *)buf; | |
130 | } | |
131 | strlcpy(clp->cl_ipaddr, ip_addr, sizeof(clp->cl_ipaddr)); | |
132 | ||
133 | error = nfs_idmap_new(clp); | |
134 | if (error < 0) { | |
135 | dprintk("%s: failed to create idmapper. Error = %d\n", | |
136 | __func__, error); | |
137 | goto error; | |
138 | } | |
139 | __set_bit(NFS_CS_IDMAP, &clp->cl_res_state); | |
140 | ||
141 | error = nfs4_init_client_minor_version(clp); | |
142 | if (error < 0) | |
143 | goto error; | |
144 | ||
145 | if (!nfs4_has_session(clp)) | |
146 | nfs_mark_client_ready(clp, NFS_CS_READY); | |
147 | return clp; | |
148 | ||
149 | error: | |
150 | nfs_mark_client_ready(clp, error); | |
151 | nfs_put_client(clp); | |
152 | dprintk("<-- nfs4_init_client() = xerror %d\n", error); | |
153 | return ERR_PTR(error); | |
154 | } | |
fcf10398 BS |
155 | |
156 | static void nfs4_destroy_server(struct nfs_server *server) | |
157 | { | |
158 | nfs_server_return_all_delegations(server); | |
159 | unset_pnfs_layoutdriver(server); | |
160 | nfs4_purge_state_owners(server); | |
161 | } | |
162 | ||
163 | /* | |
164 | * NFSv4.0 callback thread helper | |
165 | * | |
166 | * Find a client by callback identifier | |
167 | */ | |
168 | struct nfs_client * | |
169 | nfs4_find_client_ident(struct net *net, int cb_ident) | |
170 | { | |
171 | struct nfs_client *clp; | |
172 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
173 | ||
174 | spin_lock(&nn->nfs_client_lock); | |
175 | clp = idr_find(&nn->cb_ident_idr, cb_ident); | |
176 | if (clp) | |
177 | atomic_inc(&clp->cl_count); | |
178 | spin_unlock(&nn->nfs_client_lock); | |
179 | return clp; | |
180 | } | |
181 | ||
182 | #if defined(CONFIG_NFS_V4_1) | |
183 | /* Common match routine for v4.0 and v4.1 callback services */ | |
184 | static bool nfs4_cb_match_client(const struct sockaddr *addr, | |
185 | struct nfs_client *clp, u32 minorversion) | |
186 | { | |
187 | struct sockaddr *clap = (struct sockaddr *)&clp->cl_addr; | |
188 | ||
189 | /* Don't match clients that failed to initialise */ | |
190 | if (!(clp->cl_cons_state == NFS_CS_READY || | |
191 | clp->cl_cons_state == NFS_CS_SESSION_INITING)) | |
192 | return false; | |
193 | ||
194 | smp_rmb(); | |
195 | ||
196 | /* Match the version and minorversion */ | |
197 | if (clp->rpc_ops->version != 4 || | |
198 | clp->cl_minorversion != minorversion) | |
199 | return false; | |
200 | ||
201 | /* Match only the IP address, not the port number */ | |
202 | if (!nfs_sockaddr_match_ipaddr(addr, clap)) | |
203 | return false; | |
204 | ||
205 | return true; | |
206 | } | |
207 | ||
208 | /* | |
209 | * NFSv4.1 callback thread helper | |
210 | * For CB_COMPOUND calls, find a client by IP address, protocol version, | |
211 | * minorversion, and sessionID | |
212 | * | |
213 | * Returns NULL if no such client | |
214 | */ | |
215 | struct nfs_client * | |
216 | nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, | |
217 | struct nfs4_sessionid *sid) | |
218 | { | |
219 | struct nfs_client *clp; | |
220 | struct nfs_net *nn = net_generic(net, nfs_net_id); | |
221 | ||
222 | spin_lock(&nn->nfs_client_lock); | |
223 | list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) { | |
224 | if (nfs4_cb_match_client(addr, clp, 1) == false) | |
225 | continue; | |
226 | ||
227 | if (!nfs4_has_session(clp)) | |
228 | continue; | |
229 | ||
230 | /* Match sessionid*/ | |
231 | if (memcmp(clp->cl_session->sess_id.data, | |
232 | sid->data, NFS4_MAX_SESSIONID_LEN) != 0) | |
233 | continue; | |
234 | ||
235 | atomic_inc(&clp->cl_count); | |
236 | spin_unlock(&nn->nfs_client_lock); | |
237 | return clp; | |
238 | } | |
239 | spin_unlock(&nn->nfs_client_lock); | |
240 | return NULL; | |
241 | } | |
242 | ||
243 | #else /* CONFIG_NFS_V4_1 */ | |
244 | ||
245 | struct nfs_client * | |
246 | nfs4_find_client_sessionid(struct net *net, const struct sockaddr *addr, | |
247 | struct nfs4_sessionid *sid) | |
248 | { | |
249 | return NULL; | |
250 | } | |
251 | #endif /* CONFIG_NFS_V4_1 */ | |
252 | ||
253 | /* | |
254 | * Set up an NFS4 client | |
255 | */ | |
256 | static int nfs4_set_client(struct nfs_server *server, | |
257 | const char *hostname, | |
258 | const struct sockaddr *addr, | |
259 | const size_t addrlen, | |
260 | const char *ip_addr, | |
261 | rpc_authflavor_t authflavour, | |
262 | int proto, const struct rpc_timeout *timeparms, | |
263 | u32 minorversion, struct net *net) | |
264 | { | |
265 | struct nfs_client_initdata cl_init = { | |
266 | .hostname = hostname, | |
267 | .addr = addr, | |
268 | .addrlen = addrlen, | |
269 | .rpc_ops = &nfs_v4_clientops, | |
270 | .proto = proto, | |
271 | .minorversion = minorversion, | |
272 | .net = net, | |
273 | }; | |
274 | struct nfs_client *clp; | |
275 | int error; | |
276 | ||
277 | dprintk("--> nfs4_set_client()\n"); | |
278 | ||
279 | if (server->flags & NFS_MOUNT_NORESVPORT) | |
280 | set_bit(NFS_CS_NORESVPORT, &cl_init.init_flags); | |
281 | ||
282 | /* Allocate or find a client reference we can use */ | |
283 | clp = nfs_get_client(&cl_init, timeparms, ip_addr, authflavour); | |
284 | if (IS_ERR(clp)) { | |
285 | error = PTR_ERR(clp); | |
286 | goto error; | |
287 | } | |
288 | ||
289 | /* | |
290 | * Query for the lease time on clientid setup or renewal | |
291 | * | |
292 | * Note that this will be set on nfs_clients that were created | |
293 | * only for the DS role and did not set this bit, but now will | |
294 | * serve a dual role. | |
295 | */ | |
296 | set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state); | |
297 | ||
298 | server->nfs_client = clp; | |
299 | dprintk("<-- nfs4_set_client() = 0 [new %p]\n", clp); | |
300 | return 0; | |
301 | error: | |
302 | dprintk("<-- nfs4_set_client() = xerror %d\n", error); | |
303 | return error; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Set up a pNFS Data Server client. | |
308 | * | |
309 | * Return any existing nfs_client that matches server address,port,version | |
310 | * and minorversion. | |
311 | * | |
312 | * For a new nfs_client, use a soft mount (default), a low retrans and a | |
313 | * low timeout interval so that if a connection is lost, we retry through | |
314 | * the MDS. | |
315 | */ | |
316 | struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp, | |
317 | const struct sockaddr *ds_addr, int ds_addrlen, | |
318 | int ds_proto, unsigned int ds_timeo, unsigned int ds_retrans) | |
319 | { | |
320 | struct nfs_client_initdata cl_init = { | |
321 | .addr = ds_addr, | |
322 | .addrlen = ds_addrlen, | |
323 | .rpc_ops = &nfs_v4_clientops, | |
324 | .proto = ds_proto, | |
325 | .minorversion = mds_clp->cl_minorversion, | |
326 | .net = mds_clp->cl_net, | |
327 | }; | |
328 | struct rpc_timeout ds_timeout; | |
329 | struct nfs_client *clp; | |
330 | ||
331 | /* | |
332 | * Set an authflavor equual to the MDS value. Use the MDS nfs_client | |
333 | * cl_ipaddr so as to use the same EXCHANGE_ID co_ownerid as the MDS | |
334 | * (section 13.1 RFC 5661). | |
335 | */ | |
336 | nfs_init_timeout_values(&ds_timeout, ds_proto, ds_timeo, ds_retrans); | |
337 | clp = nfs_get_client(&cl_init, &ds_timeout, mds_clp->cl_ipaddr, | |
338 | mds_clp->cl_rpcclient->cl_auth->au_flavor); | |
339 | ||
340 | dprintk("<-- %s %p\n", __func__, clp); | |
341 | return clp; | |
342 | } | |
343 | EXPORT_SYMBOL_GPL(nfs4_set_ds_client); | |
344 | ||
345 | /* | |
346 | * Session has been established, and the client marked ready. | |
347 | * Set the mount rsize and wsize with negotiated fore channel | |
348 | * attributes which will be bound checked in nfs_server_set_fsinfo. | |
349 | */ | |
350 | static void nfs4_session_set_rwsize(struct nfs_server *server) | |
351 | { | |
352 | #ifdef CONFIG_NFS_V4_1 | |
353 | struct nfs4_session *sess; | |
354 | u32 server_resp_sz; | |
355 | u32 server_rqst_sz; | |
356 | ||
357 | if (!nfs4_has_session(server->nfs_client)) | |
358 | return; | |
359 | sess = server->nfs_client->cl_session; | |
360 | server_resp_sz = sess->fc_attrs.max_resp_sz - nfs41_maxread_overhead; | |
361 | server_rqst_sz = sess->fc_attrs.max_rqst_sz - nfs41_maxwrite_overhead; | |
362 | ||
363 | if (server->rsize > server_resp_sz) | |
364 | server->rsize = server_resp_sz; | |
365 | if (server->wsize > server_rqst_sz) | |
366 | server->wsize = server_rqst_sz; | |
367 | #endif /* CONFIG_NFS_V4_1 */ | |
368 | } | |
369 | ||
370 | static int nfs4_server_common_setup(struct nfs_server *server, | |
371 | struct nfs_fh *mntfh) | |
372 | { | |
373 | struct nfs_fattr *fattr; | |
374 | int error; | |
375 | ||
376 | BUG_ON(!server->nfs_client); | |
377 | BUG_ON(!server->nfs_client->rpc_ops); | |
378 | BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops); | |
379 | ||
380 | /* data servers support only a subset of NFSv4.1 */ | |
381 | if (is_ds_only_client(server->nfs_client)) | |
382 | return -EPROTONOSUPPORT; | |
383 | ||
384 | fattr = nfs_alloc_fattr(); | |
385 | if (fattr == NULL) | |
386 | return -ENOMEM; | |
387 | ||
388 | /* We must ensure the session is initialised first */ | |
389 | error = nfs4_init_session(server); | |
390 | if (error < 0) | |
391 | goto out; | |
392 | ||
393 | /* Probe the root fh to retrieve its FSID and filehandle */ | |
394 | error = nfs4_get_rootfh(server, mntfh); | |
395 | if (error < 0) | |
396 | goto out; | |
397 | ||
398 | dprintk("Server FSID: %llx:%llx\n", | |
399 | (unsigned long long) server->fsid.major, | |
400 | (unsigned long long) server->fsid.minor); | |
401 | dprintk("Mount FH: %d\n", mntfh->size); | |
402 | ||
403 | nfs4_session_set_rwsize(server); | |
404 | ||
405 | error = nfs_probe_fsinfo(server, mntfh, fattr); | |
406 | if (error < 0) | |
407 | goto out; | |
408 | ||
409 | if (server->namelen == 0 || server->namelen > NFS4_MAXNAMLEN) | |
410 | server->namelen = NFS4_MAXNAMLEN; | |
411 | ||
412 | nfs_server_insert_lists(server); | |
413 | server->mount_time = jiffies; | |
414 | server->destroy = nfs4_destroy_server; | |
415 | out: | |
416 | nfs_free_fattr(fattr); | |
417 | return error; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Create a version 4 volume record | |
422 | */ | |
423 | static int nfs4_init_server(struct nfs_server *server, | |
424 | const struct nfs_parsed_mount_data *data) | |
425 | { | |
426 | struct rpc_timeout timeparms; | |
427 | int error; | |
428 | ||
429 | dprintk("--> nfs4_init_server()\n"); | |
430 | ||
431 | nfs_init_timeout_values(&timeparms, data->nfs_server.protocol, | |
432 | data->timeo, data->retrans); | |
433 | ||
434 | /* Initialise the client representation from the mount data */ | |
435 | server->flags = data->flags; | |
436 | server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR|NFS_CAP_POSIX_LOCK; | |
437 | if (!(data->flags & NFS_MOUNT_NORDIRPLUS)) | |
438 | server->caps |= NFS_CAP_READDIRPLUS; | |
439 | server->options = data->options; | |
440 | ||
441 | /* Get a client record */ | |
442 | error = nfs4_set_client(server, | |
443 | data->nfs_server.hostname, | |
444 | (const struct sockaddr *)&data->nfs_server.address, | |
445 | data->nfs_server.addrlen, | |
446 | data->client_address, | |
447 | data->auth_flavors[0], | |
448 | data->nfs_server.protocol, | |
449 | &timeparms, | |
450 | data->minorversion, | |
451 | data->net); | |
452 | if (error < 0) | |
453 | goto error; | |
454 | ||
455 | /* | |
456 | * Don't use NFS uid/gid mapping if we're using AUTH_SYS or lower | |
457 | * authentication. | |
458 | */ | |
459 | if (nfs4_disable_idmapping && data->auth_flavors[0] == RPC_AUTH_UNIX) | |
460 | server->caps |= NFS_CAP_UIDGID_NOMAP; | |
461 | ||
462 | if (data->rsize) | |
463 | server->rsize = nfs_block_size(data->rsize, NULL); | |
464 | if (data->wsize) | |
465 | server->wsize = nfs_block_size(data->wsize, NULL); | |
466 | ||
467 | server->acregmin = data->acregmin * HZ; | |
468 | server->acregmax = data->acregmax * HZ; | |
469 | server->acdirmin = data->acdirmin * HZ; | |
470 | server->acdirmax = data->acdirmax * HZ; | |
471 | ||
472 | server->port = data->nfs_server.port; | |
473 | ||
474 | error = nfs_init_server_rpcclient(server, &timeparms, data->auth_flavors[0]); | |
475 | ||
476 | error: | |
477 | /* Done */ | |
478 | dprintk("<-- nfs4_init_server() = %d\n", error); | |
479 | return error; | |
480 | } | |
481 | ||
482 | /* | |
483 | * Create a version 4 volume record | |
484 | * - keyed on server and FSID | |
485 | */ | |
486 | struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data, | |
487 | struct nfs_fh *mntfh) | |
488 | { | |
489 | struct nfs_server *server; | |
490 | int error; | |
491 | ||
492 | dprintk("--> nfs4_create_server()\n"); | |
493 | ||
494 | server = nfs_alloc_server(); | |
495 | if (!server) | |
496 | return ERR_PTR(-ENOMEM); | |
497 | ||
498 | /* set up the general RPC client */ | |
499 | error = nfs4_init_server(server, data); | |
500 | if (error < 0) | |
501 | goto error; | |
502 | ||
503 | error = nfs4_server_common_setup(server, mntfh); | |
504 | if (error < 0) | |
505 | goto error; | |
506 | ||
507 | dprintk("<-- nfs4_create_server() = %p\n", server); | |
508 | return server; | |
509 | ||
510 | error: | |
511 | nfs_free_server(server); | |
512 | dprintk("<-- nfs4_create_server() = error %d\n", error); | |
513 | return ERR_PTR(error); | |
514 | } | |
515 | ||
516 | /* | |
517 | * Create an NFS4 referral server record | |
518 | */ | |
519 | struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *data, | |
520 | struct nfs_fh *mntfh) | |
521 | { | |
522 | struct nfs_client *parent_client; | |
523 | struct nfs_server *server, *parent_server; | |
524 | int error; | |
525 | ||
526 | dprintk("--> nfs4_create_referral_server()\n"); | |
527 | ||
528 | server = nfs_alloc_server(); | |
529 | if (!server) | |
530 | return ERR_PTR(-ENOMEM); | |
531 | ||
532 | parent_server = NFS_SB(data->sb); | |
533 | parent_client = parent_server->nfs_client; | |
534 | ||
535 | /* Initialise the client representation from the parent server */ | |
536 | nfs_server_copy_userdata(server, parent_server); | |
537 | server->caps |= NFS_CAP_ATOMIC_OPEN|NFS_CAP_CHANGE_ATTR; | |
538 | ||
539 | /* Get a client representation. | |
540 | * Note: NFSv4 always uses TCP, */ | |
541 | error = nfs4_set_client(server, data->hostname, | |
542 | data->addr, | |
543 | data->addrlen, | |
544 | parent_client->cl_ipaddr, | |
545 | data->authflavor, | |
546 | rpc_protocol(parent_server->client), | |
547 | parent_server->client->cl_timeout, | |
548 | parent_client->cl_mvops->minor_version, | |
549 | parent_client->cl_net); | |
550 | if (error < 0) | |
551 | goto error; | |
552 | ||
553 | error = nfs_init_server_rpcclient(server, parent_server->client->cl_timeout, data->authflavor); | |
554 | if (error < 0) | |
555 | goto error; | |
556 | ||
557 | error = nfs4_server_common_setup(server, mntfh); | |
558 | if (error < 0) | |
559 | goto error; | |
560 | ||
561 | dprintk("<-- nfs_create_referral_server() = %p\n", server); | |
562 | return server; | |
563 | ||
564 | error: | |
565 | nfs_free_server(server); | |
566 | dprintk("<-- nfs4_create_referral_server() = error %d\n", error); | |
567 | return ERR_PTR(error); | |
568 | } | |
569 | ||
570 | module_param(nfs4_disable_idmapping, bool, 0644); | |
571 | MODULE_PARM_DESC(nfs4_disable_idmapping, | |
572 | "Turn off NFSv4 idmapping when using 'sec=sys'"); |