blob: 8e9689abbc0c7594fb6aa6cb7fb7735018165162 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/namei.h>
Bruce Allanf35279d2005-09-06 15:17:08 -070016#include <linux/module.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070017#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Aurélien Charbonf15364b2008-01-18 15:50:56 +010019#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Boaz Harrosh9a74af22009-12-03 20:30:56 +020021#include "nfsd.h"
J. Bruce Fields1557aca2009-12-04 19:36:06 -050022#include "nfsfh.h"
Boaz Harrosh9a74af22009-12-03 20:30:56 +020023
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26typedef struct auth_domain svc_client;
27typedef struct svc_export svc_export;
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029/*
30 * We have two caches.
31 * One maps client+vfsmnt+dentry to export options - the export map
32 * The other maps client+filehandle-fragment to export options. - the expkey map
33 *
34 * The export options are actually stored in the first map, and the
35 * second map contains a reference to the entry in the first map.
36 */
37
38#define EXPKEY_HASHBITS 8
39#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
40#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
41static struct cache_head *expkey_table[EXPKEY_HASHMAX];
42
Adrian Bunk74cae612006-03-27 01:15:10 -080043static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044{
NeilBrownbaab9352006-03-27 01:15:09 -080045 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
46
47 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080048 !test_bit(CACHE_NEGATIVE, &key->h.flags))
49 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080050 auth_domain_put(key->ek_client);
51 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070052}
53
54static void expkey_request(struct cache_detail *cd,
55 struct cache_head *h,
56 char **bpp, int *blen)
57{
58 /* client fsidtype \xfsid */
59 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
60 char type[5];
61
62 qword_add(bpp, blen, ek->ek_client->name);
63 snprintf(type, 5, "%d", ek->ek_fsidtype);
64 qword_add(bpp, blen, type);
65 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
66 (*bpp)[-1] = '\n';
67}
68
Trond Myklebustbc74b4f2009-08-09 15:14:29 -040069static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
70{
71 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
72}
73
NeilBrown8d270f72006-03-27 01:15:04 -080074static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
75static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080076static struct cache_detail svc_expkey_cache;
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
79{
80 /* client fsidtype fsid [path] */
81 char *buf;
82 int len;
83 struct auth_domain *dom = NULL;
84 int err;
85 int fsidtype;
86 char *ep;
87 struct svc_expkey key;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040088 struct svc_expkey *ek = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Dan Carpenter34769642012-01-20 10:48:18 +030090 if (mesg[mlen - 1] != '\n')
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return -EINVAL;
92 mesg[mlen-1] = 0;
93
94 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
95 err = -ENOMEM;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040096 if (!buf)
97 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99 err = -EINVAL;
100 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
101 goto out;
102
103 err = -ENOENT;
104 dom = auth_domain_find(buf);
105 if (!dom)
106 goto out;
107 dprintk("found domain %s\n", buf);
108
109 err = -EINVAL;
110 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
111 goto out;
112 fsidtype = simple_strtoul(buf, &ep, 10);
113 if (*ep)
114 goto out;
115 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700116 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 goto out;
118 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
119 goto out;
120 dprintk("found fsid length %d\n", len);
121 if (len != key_len(fsidtype))
122 goto out;
123
124 /* OK, we seem to have a valid key */
125 key.h.flags = 0;
126 key.h.expiry_time = get_expiry(&mesg);
127 if (key.h.expiry_time == 0)
128 goto out;
129
130 key.ek_client = dom;
131 key.ek_fsidtype = fsidtype;
132 memcpy(key.ek_fsid, buf, len);
133
NeilBrown8d270f72006-03-27 01:15:04 -0800134 ek = svc_expkey_lookup(&key);
135 err = -ENOMEM;
136 if (!ek)
137 goto out;
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f72006-03-27 01:15:04 -0800140 err = -EINVAL;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400141 len = qword_get(&mesg, buf, PAGE_SIZE);
142 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 goto out;
144 dprintk("Path seems to be <%s>\n", buf);
145 err = 0;
146 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f72006-03-27 01:15:04 -0800148 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400149 if (!ek)
150 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 } else {
Al Viroa63bb992008-08-02 01:03:36 -0400152 err = kern_path(buf, 0, &key.ek_path);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400153 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 goto out;
155
156 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800157
NeilBrown8d270f72006-03-27 01:15:04 -0800158 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400159 if (!ek)
NeilBrown8d270f72006-03-27 01:15:04 -0800160 err = -ENOMEM;
Al Viroa63bb992008-08-02 01:03:36 -0400161 path_put(&key.ek_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 }
163 cache_flush();
164 out:
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400165 if (ek)
166 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 if (dom)
168 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800169 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 return err;
171}
172
173static int expkey_show(struct seq_file *m,
174 struct cache_detail *cd,
175 struct cache_head *h)
176{
177 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800178 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 if (h ==NULL) {
181 seq_puts(m, "#domain fsidtype fsid [path]\n");
182 return 0;
183 }
184 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800185 seq_printf(m, "%s %d 0x", ek->ek_client->name,
186 ek->ek_fsidtype);
187 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
188 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (test_bit(CACHE_VALID, &h->flags) &&
190 !test_bit(CACHE_NEGATIVE, &h->flags)) {
191 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800192 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 }
194 seq_printf(m, "\n");
195 return 0;
196}
NeilBrown8d270f72006-03-27 01:15:04 -0800197
198static inline int expkey_match (struct cache_head *a, struct cache_head *b)
199{
200 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
201 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
202
203 if (orig->ek_fsidtype != new->ek_fsidtype ||
204 orig->ek_client != new->ek_client ||
205 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
206 return 0;
207 return 1;
208}
209
210static inline void expkey_init(struct cache_head *cnew,
211 struct cache_head *citem)
212{
213 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
214 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
215
216 kref_get(&item->ek_client->ref);
217 new->ek_client = item->ek_client;
218 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800219
220 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f72006-03-27 01:15:04 -0800221}
222
223static inline void expkey_update(struct cache_head *cnew,
224 struct cache_head *citem)
225{
226 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
227 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
228
Jan Bluncke83aece2008-02-14 19:38:41 -0800229 new->ek_path = item->ek_path;
230 path_get(&item->ek_path);
NeilBrown8d270f72006-03-27 01:15:04 -0800231}
232
233static struct cache_head *expkey_alloc(void)
234{
235 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
236 if (i)
237 return &i->h;
238 else
239 return NULL;
240}
241
Adrian Bunk74cae612006-03-27 01:15:10 -0800242static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700243 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 .hash_size = EXPKEY_HASHMAX,
245 .hash_table = expkey_table,
246 .name = "nfsd.fh",
247 .cache_put = expkey_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400248 .cache_upcall = expkey_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 .cache_parse = expkey_parse,
250 .cache_show = expkey_show,
NeilBrown8d270f72006-03-27 01:15:04 -0800251 .match = expkey_match,
252 .init = expkey_init,
253 .update = expkey_update,
254 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255};
256
NeilBrown61f86032010-02-03 17:31:31 +1100257static int
258svc_expkey_hash(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
NeilBrown8d270f72006-03-27 01:15:04 -0800260 int hash = item->ek_fsidtype;
261 char * cp = (char*)item->ek_fsid;
262 int len = key_len(item->ek_fsidtype);
263
264 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
265 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
266 hash &= EXPKEY_HASHMASK;
NeilBrown61f86032010-02-03 17:31:31 +1100267 return hash;
268}
269
270static struct svc_expkey *
271svc_expkey_lookup(struct svc_expkey *item)
272{
273 struct cache_head *ch;
274 int hash = svc_expkey_hash(item);
NeilBrown8d270f72006-03-27 01:15:04 -0800275
276 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
277 hash);
278 if (ch)
279 return container_of(ch, struct svc_expkey, h);
280 else
281 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
NeilBrown8d270f72006-03-27 01:15:04 -0800284static struct svc_expkey *
285svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
NeilBrown8d270f72006-03-27 01:15:04 -0800287 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100288 int hash = svc_expkey_hash(new);
NeilBrown8d270f72006-03-27 01:15:04 -0800289
290 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
291 &old->h, hash);
292 if (ch)
293 return container_of(ch, struct svc_expkey, h);
294 else
295 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299#define EXPORT_HASHBITS 8
300#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302static struct cache_head *export_table[EXPORT_HASHMAX];
303
Manoj Naik93346912006-10-04 02:16:18 -0700304static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
305{
306 int i;
307
308 for (i = 0; i < fsloc->locations_count; i++) {
309 kfree(fsloc->locations[i].path);
310 kfree(fsloc->locations[i].hosts);
311 }
312 kfree(fsloc->locations);
313}
314
NeilBrownbaab9352006-03-27 01:15:09 -0800315static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
NeilBrownbaab9352006-03-27 01:15:09 -0800317 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800318 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800319 auth_domain_put(exp->ex_client);
Manoj Naik93346912006-10-04 02:16:18 -0700320 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800321 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322}
323
324static void svc_export_request(struct cache_detail *cd,
325 struct cache_head *h,
326 char **bpp, int *blen)
327{
328 /* client path */
329 struct svc_export *exp = container_of(h, struct svc_export, h);
330 char *pth;
331
332 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800333 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 if (IS_ERR(pth)) {
335 /* is this correct? */
336 (*bpp)[0] = '\n';
337 return;
338 }
339 qword_add(bpp, blen, pth);
340 (*bpp)[-1] = '\n';
341}
342
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400343static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
344{
345 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
346}
347
Adrian Bunk74cae612006-03-27 01:15:10 -0800348static struct svc_export *svc_export_update(struct svc_export *new,
349 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800350static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
J. Bruce Fields774b1472009-12-13 20:21:48 -0500352static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
354
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500355 /*
356 * We currently export only dirs, regular files, and (for v4
357 * pseudoroot) symlinks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 */
359 if (!S_ISDIR(inode->i_mode) &&
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500360 !S_ISLNK(inode->i_mode) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 !S_ISREG(inode->i_mode))
362 return -ENOTDIR;
363
J. Bruce Fields774b1472009-12-13 20:21:48 -0500364 /*
365 * Mountd should never pass down a writeable V4ROOT export, but,
366 * just to make sure:
367 */
368 if (*flags & NFSEXP_V4ROOT)
369 *flags |= NFSEXP_READONLY;
370
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 /* There are two requirements on a filesystem to be exportable.
372 * 1: We must be able to identify the filesystem from a number.
373 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800374 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 * 2: We must be able to find an inode from a filehandle.
376 * This means that s_export_op must be set.
377 */
378 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
J. Bruce Fields774b1472009-12-13 20:21:48 -0500379 !(*flags & NFSEXP_FSID) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800380 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700381 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 return -EINVAL;
383 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700384
385 if (!inode->i_sb->s_export_op ||
386 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 dprintk("exp_export: export of invalid fs type.\n");
388 return -EINVAL;
389 }
390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 return 0;
392
393}
394
Manoj Naik93346912006-10-04 02:16:18 -0700395#ifdef CONFIG_NFSD_V4
396
397static int
398fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
399{
400 int len;
401 int migrated, i, err;
402
Manoj Naik93346912006-10-04 02:16:18 -0700403 /* listsize */
404 err = get_int(mesg, &fsloc->locations_count);
405 if (err)
406 return err;
407 if (fsloc->locations_count > MAX_FS_LOCATIONS)
408 return -EINVAL;
409 if (fsloc->locations_count == 0)
410 return 0;
411
412 fsloc->locations = kzalloc(fsloc->locations_count
413 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
414 if (!fsloc->locations)
415 return -ENOMEM;
416 for (i=0; i < fsloc->locations_count; i++) {
417 /* colon separated host list */
418 err = -EINVAL;
419 len = qword_get(mesg, buf, PAGE_SIZE);
420 if (len <= 0)
421 goto out_free_all;
422 err = -ENOMEM;
423 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
424 if (!fsloc->locations[i].hosts)
425 goto out_free_all;
426 err = -EINVAL;
427 /* slash separated path component list */
428 len = qword_get(mesg, buf, PAGE_SIZE);
429 if (len <= 0)
430 goto out_free_all;
431 err = -ENOMEM;
432 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
433 if (!fsloc->locations[i].path)
434 goto out_free_all;
435 }
436 /* migrated */
437 err = get_int(mesg, &migrated);
438 if (err)
439 goto out_free_all;
440 err = -EINVAL;
441 if (migrated < 0 || migrated > 1)
442 goto out_free_all;
443 fsloc->migrated = migrated;
444 return 0;
445out_free_all:
446 nfsd4_fslocs_free(fsloc);
447 return err;
448}
449
Andy Adamsone677bfe2007-07-17 04:04:42 -0700450static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
451{
452 int listsize, err;
453 struct exp_flavor_info *f;
454
455 err = get_int(mesg, &listsize);
456 if (err)
457 return err;
458 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
459 return -EINVAL;
460
461 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
462 err = get_int(mesg, &f->pseudoflavor);
463 if (err)
464 return err;
465 /*
Roel Kluin80492e72009-04-21 16:08:39 +0200466 * XXX: It would be nice to also check whether this
467 * pseudoflavor is supported, so we can discover the
468 * problem at export time instead of when a client fails
469 * to authenticate.
Andy Adamsone677bfe2007-07-17 04:04:42 -0700470 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700471 err = get_int(mesg, &f->flags);
472 if (err)
473 return err;
474 /* Only some flags are allowed to differ between flavors: */
475 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
476 return -EINVAL;
477 }
478 exp->ex_nflavors = listsize;
479 return 0;
480}
481
Manoj Naik93346912006-10-04 02:16:18 -0700482#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700483static inline int
484fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
485static inline int
486secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik93346912006-10-04 02:16:18 -0700487#endif
488
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
490{
491 /* client path expiry [flags anonuid anongid fsid] */
492 char *buf;
493 int len;
494 int err;
495 struct auth_domain *dom = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400496 struct svc_export exp = {}, *expp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 int an_int;
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 if (mesg[mlen-1] != '\n')
500 return -EINVAL;
501 mesg[mlen-1] = 0;
502
503 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Al Viroc1a2a472008-08-02 01:01:02 -0400504 if (!buf)
505 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 /* client */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400509 len = qword_get(&mesg, buf, PAGE_SIZE);
510 if (len <= 0)
511 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 err = -ENOENT;
514 dom = auth_domain_find(buf);
515 if (!dom)
516 goto out;
517
518 /* path */
519 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400520 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
521 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
Al Viroc1a2a472008-08-02 01:01:02 -0400523 err = kern_path(buf, 0, &exp.ex_path);
524 if (err)
525 goto out1;
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 exp.ex_client = dom;
Al Viroc1a2a472008-08-02 01:01:02 -0400528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 /* expiry */
530 err = -EINVAL;
531 exp.h.expiry_time = get_expiry(&mesg);
532 if (exp.h.expiry_time == 0)
Al Viroc1a2a472008-08-02 01:01:02 -0400533 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 /* flags */
536 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700537 if (err == -ENOENT) {
538 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700540 } else {
Al Viroc1a2a472008-08-02 01:01:02 -0400541 if (err || an_int < 0)
542 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 exp.ex_flags= an_int;
544
545 /* anon uid */
546 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400547 if (err)
548 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 exp.ex_anon_uid= an_int;
550
551 /* anon gid */
552 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400553 if (err)
554 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 exp.ex_anon_gid= an_int;
556
557 /* fsid */
558 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400559 if (err)
560 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 exp.ex_fsid = an_int;
562
NeilBrownaf6a4e22007-02-14 00:33:12 -0800563 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
564 if (strcmp(buf, "fsloc") == 0)
565 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
566 else if (strcmp(buf, "uuid") == 0) {
567 /* expect a 16 byte uuid encoded as \xXXXX... */
568 len = qword_get(&mesg, buf, PAGE_SIZE);
569 if (len != 16)
570 err = -EINVAL;
571 else {
572 exp.ex_uuid =
573 kmemdup(buf, 16, GFP_KERNEL);
574 if (exp.ex_uuid == NULL)
575 err = -ENOMEM;
576 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700577 } else if (strcmp(buf, "secinfo") == 0)
578 err = secinfo_parse(&mesg, buf, &exp);
579 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800580 /* quietly ignore unknown words and anything
581 * following. Newer user-space can try to set
582 * new values, then see what the result was.
583 */
584 break;
585 if (err)
Al Viroc1a2a472008-08-02 01:01:02 -0400586 goto out4;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800587 }
Manoj Naik93346912006-10-04 02:16:18 -0700588
J. Bruce Fields774b1472009-12-13 20:21:48 -0500589 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800590 exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400591 if (err)
592 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 }
594
NeilBrown4f7774c2006-03-27 01:15:03 -0800595 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800597 expp = svc_export_update(&exp, expp);
598 else
599 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800601 if (expp == NULL)
602 err = -ENOMEM;
603 else
604 exp_put(expp);
Al Viroc1a2a472008-08-02 01:01:02 -0400605out4:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800606 nfsd4_fslocs_free(&exp.ex_fslocs);
607 kfree(exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400608out3:
Al Viroc1a2a472008-08-02 01:01:02 -0400609 path_put(&exp.ex_path);
610out1:
611 auth_domain_put(dom);
612out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800613 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 return err;
615}
616
Manoj Naik93346912006-10-04 02:16:18 -0700617static void exp_flags(struct seq_file *m, int flag, int fsid,
618 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700619static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621static int svc_export_show(struct seq_file *m,
622 struct cache_detail *cd,
623 struct cache_head *h)
624{
625 struct svc_export *exp ;
626
627 if (h ==NULL) {
628 seq_puts(m, "#path domain(flags)\n");
629 return 0;
630 }
631 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800632 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 seq_putc(m, '\t');
634 seq_escape(m, exp->ex_client->name, " \t\n\\");
635 seq_putc(m, '(');
636 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800637 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik93346912006-10-04 02:16:18 -0700638 exp_flags(m, exp->ex_flags, exp->ex_fsid,
639 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800640 if (exp->ex_uuid) {
641 int i;
642 seq_puts(m, ",uuid=");
643 for (i=0; i<16; i++) {
644 if ((i&3) == 0 && i)
645 seq_putc(m, ':');
646 seq_printf(m, "%02x", exp->ex_uuid[i]);
647 }
648 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700649 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800650 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 seq_puts(m, ")\n");
652 return 0;
653}
NeilBrown4f7774c2006-03-27 01:15:03 -0800654static int svc_export_match(struct cache_head *a, struct cache_head *b)
655{
656 struct svc_export *orig = container_of(a, struct svc_export, h);
657 struct svc_export *new = container_of(b, struct svc_export, h);
658 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800659 orig->ex_path.dentry == new->ex_path.dentry &&
660 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800661}
662
663static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
664{
665 struct svc_export *new = container_of(cnew, struct svc_export, h);
666 struct svc_export *item = container_of(citem, struct svc_export, h);
667
668 kref_get(&item->ex_client->ref);
669 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800670 new->ex_path.dentry = dget(item->ex_path.dentry);
671 new->ex_path.mnt = mntget(item->ex_path.mnt);
Manoj Naik93346912006-10-04 02:16:18 -0700672 new->ex_fslocs.locations = NULL;
673 new->ex_fslocs.locations_count = 0;
674 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800675}
676
677static void export_update(struct cache_head *cnew, struct cache_head *citem)
678{
679 struct svc_export *new = container_of(cnew, struct svc_export, h);
680 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700681 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800682
683 new->ex_flags = item->ex_flags;
684 new->ex_anon_uid = item->ex_anon_uid;
685 new->ex_anon_gid = item->ex_anon_gid;
686 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800687 new->ex_uuid = item->ex_uuid;
688 item->ex_uuid = NULL;
Manoj Naik93346912006-10-04 02:16:18 -0700689 new->ex_fslocs.locations = item->ex_fslocs.locations;
690 item->ex_fslocs.locations = NULL;
691 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
692 item->ex_fslocs.locations_count = 0;
693 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
694 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700695 new->ex_nflavors = item->ex_nflavors;
696 for (i = 0; i < MAX_SECINFO_LIST; i++) {
697 new->ex_flavors[i] = item->ex_flavors[i];
698 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800699}
700
701static struct cache_head *svc_export_alloc(void)
702{
703 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
704 if (i)
705 return &i->h;
706 else
707 return NULL;
708}
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700711 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 .hash_size = EXPORT_HASHMAX,
713 .hash_table = export_table,
714 .name = "nfsd.export",
715 .cache_put = svc_export_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400716 .cache_upcall = svc_export_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 .cache_parse = svc_export_parse,
718 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800719 .match = svc_export_match,
720 .init = svc_export_init,
721 .update = export_update,
722 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723};
724
NeilBrown61f86032010-02-03 17:31:31 +1100725static int
726svc_export_hash(struct svc_export *exp)
727{
728 int hash;
729
730 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
731 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
732 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
733 return hash;
734}
735
NeilBrown4f7774c2006-03-27 01:15:03 -0800736static struct svc_export *
737svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738{
NeilBrown4f7774c2006-03-27 01:15:03 -0800739 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100740 int hash = svc_export_hash(exp);
NeilBrown4f7774c2006-03-27 01:15:03 -0800741
742 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
743 hash);
744 if (ch)
745 return container_of(ch, struct svc_export, h);
746 else
747 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749
Adrian Bunk74cae612006-03-27 01:15:10 -0800750static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800751svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
NeilBrown4f7774c2006-03-27 01:15:03 -0800753 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100754 int hash = svc_export_hash(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
NeilBrown4f7774c2006-03-27 01:15:03 -0800756 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
757 &old->h,
758 hash);
759 if (ch)
760 return container_of(ch, struct svc_export, h);
761 else
762 return NULL;
763}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765
Adrian Bunk74cae612006-03-27 01:15:10 -0800766static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
768{
769 struct svc_expkey key, *ek;
770 int err;
771
772 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700773 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
775 key.ek_client = clp;
776 key.ek_fsidtype = fsid_type;
777 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
778
NeilBrown8d270f72006-03-27 01:15:04 -0800779 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700780 if (ek == NULL)
781 return ERR_PTR(-ENOMEM);
782 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
783 if (err)
784 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 return ek;
786}
787
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Al Viro55430e22009-04-18 02:04:46 -0400789static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
790 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
792 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700793 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700796 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 key.ex_client = clp;
Al Viro55430e22009-04-18 02:04:46 -0400799 key.ex_path = *path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
NeilBrown4f7774c2006-03-27 01:15:03 -0800801 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700802 if (exp == NULL)
803 return ERR_PTR(-ENOMEM);
804 err = cache_check(&svc_export_cache, &exp->h, reqp);
805 if (err)
806 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 return exp;
808}
809
810/*
811 * Find the export entry for a given dentry.
812 */
Al Viro5bf3bd22009-04-18 02:14:32 -0400813static struct svc_export *exp_parent(svc_client *clp, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
Al Viro5bf3bd22009-04-18 02:14:32 -0400815 struct dentry *saved = dget(path->dentry);
816 svc_export *exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Al Viro5bf3bd22009-04-18 02:14:32 -0400818 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
819 struct dentry *parent = dget_parent(path->dentry);
820 dput(path->dentry);
821 path->dentry = parent;
822 exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 }
Al Viro5bf3bd22009-04-18 02:14:32 -0400824 dput(path->dentry);
825 path->dentry = saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 return exp;
827}
828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831/*
832 * Obtain the root fh on behalf of a client.
833 * This could be done in user space, but I feel that it adds some safety
834 * since its harder to fool a kernel module than a user space program.
835 */
836int
Al Viroa63bb992008-08-02 01:03:36 -0400837exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838{
839 struct svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -0400840 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 struct inode *inode;
842 struct svc_fh fh;
843 int err;
844
845 err = -EPERM;
846 /* NB: we probably ought to check that it's NUL-terminated */
Al Viroa63bb992008-08-02 01:03:36 -0400847 if (kern_path(name, 0, &path)) {
848 printk("nfsd: exp_rootfh path not found %s", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 return err;
850 }
Al Viroa63bb992008-08-02 01:03:36 -0400851 inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
853 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Al Viroa63bb992008-08-02 01:03:36 -0400854 name, path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 inode->i_sb->s_id, inode->i_ino);
Al Viro5bf3bd22009-04-18 02:14:32 -0400856 exp = exp_parent(clp, &path);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -0800857 if (IS_ERR(exp)) {
858 err = PTR_ERR(exp);
859 goto out;
860 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 /*
863 * fh must be initialized before calling fh_compose
864 */
865 fh_init(&fh, maxsize);
Al Viroa63bb992008-08-02 01:03:36 -0400866 if (fh_compose(&fh, exp, path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 err = -EINVAL;
868 else
869 err = 0;
870 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
871 fh_put(&fh);
872 exp_put(exp);
873out:
Al Viroa63bb992008-08-02 01:03:36 -0400874 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 return err;
876}
877
Adrian Bunkcce76f92007-10-16 01:27:52 -0700878static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
879 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -0800880{
881 struct svc_export *exp;
882 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700883 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -0800884 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800885
Al Viro55430e22009-04-18 02:04:46 -0400886 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -0800887 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800888
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700889 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -0800890 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800891 return exp;
892}
893
Andy Adamson32c1eb02007-07-17 04:04:48 -0700894__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
895{
896 struct exp_flavor_info *f;
897 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
898
899 /* legacy gss-only clients are always OK: */
900 if (exp->ex_client == rqstp->rq_gssclient)
901 return 0;
902 /* ip-address based client; check sec= export option: */
903 for (f = exp->ex_flavors; f < end; f++) {
904 if (f->pseudoflavor == rqstp->rq_flavor)
905 return 0;
906 }
907 /* defaults in absence of sec= options: */
908 if (exp->ex_nflavors == 0) {
909 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
910 rqstp->rq_flavor == RPC_AUTH_UNIX)
911 return 0;
912 }
913 return nfserr_wrongsec;
914}
915
J. Bruce Fields0989a782007-07-17 04:04:44 -0700916/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700917 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
918 * auth_unix client) if it's available and has secinfo information;
919 * otherwise, will try to use rq_gssclient.
920 *
J. Bruce Fields0989a782007-07-17 04:04:44 -0700921 * Called from functions that handle requests; functions that do work on
922 * behalf of mountd are passed a single client name to use, and should
923 * use exp_get_by_name() or exp_find().
924 */
925struct svc_export *
Al Viro91c9fa82009-04-18 02:42:05 -0400926rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -0700927{
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700928 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700929
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700930 if (rqstp->rq_client == NULL)
931 goto gss;
932
933 /* First try the auth_unix client: */
Al Viro91c9fa82009-04-18 02:42:05 -0400934 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700935 if (PTR_ERR(exp) == -ENOENT)
936 goto gss;
937 if (IS_ERR(exp))
938 return exp;
939 /* If it has secinfo, assume there are no gss/... clients */
940 if (exp->ex_nflavors > 0)
941 return exp;
942gss:
943 /* Otherwise, try falling back on gss client */
944 if (rqstp->rq_gssclient == NULL)
945 return exp;
Al Viro91c9fa82009-04-18 02:42:05 -0400946 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700947 if (PTR_ERR(gssexp) == -ENOENT)
948 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700949 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700950 exp_put(exp);
951 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700952}
953
954struct svc_export *
955rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
956{
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700957 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700958
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700959 if (rqstp->rq_client == NULL)
960 goto gss;
961
962 /* First try the auth_unix client: */
963 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
964 if (PTR_ERR(exp) == -ENOENT)
965 goto gss;
966 if (IS_ERR(exp))
967 return exp;
968 /* If it has secinfo, assume there are no gss/... clients */
969 if (exp->ex_nflavors > 0)
970 return exp;
971gss:
972 /* Otherwise, try falling back on gss client */
973 if (rqstp->rq_gssclient == NULL)
974 return exp;
975 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
976 &rqstp->rq_chandle);
977 if (PTR_ERR(gssexp) == -ENOENT)
978 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700979 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700980 exp_put(exp);
981 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700982}
983
984struct svc_export *
Al Viroe64c3902009-04-18 03:00:46 -0400985rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -0700986{
Al Viroe64c3902009-04-18 03:00:46 -0400987 struct dentry *saved = dget(path->dentry);
988 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700989
Al Viroe64c3902009-04-18 03:00:46 -0400990 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
991 struct dentry *parent = dget_parent(path->dentry);
992 dput(path->dentry);
993 path->dentry = parent;
994 exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700995 }
Al Viroe64c3902009-04-18 03:00:46 -0400996 dput(path->dentry);
997 path->dentry = saved;
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700998 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700999}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001000
Trond Myklebusted748aa2011-09-12 19:37:06 -04001001struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001002{
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001003 u32 fsidv[2];
1004
1005 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1006
J. Bruce Fields260c64d2010-02-08 13:42:26 -05001007 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001008}
1009
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010/*
1011 * Called when we need the filehandle for the root of the pseudofs,
1012 * for a given NFSv4 client. The root is defined to be the
1013 * export point with fsid==0
1014 */
Al Viroc7afef12006-10-19 23:29:02 -07001015__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001016exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001018 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001019 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Trond Myklebusted748aa2011-09-12 19:37:06 -04001021 exp = rqst_find_fsidzero_export(rqstp);
J.Bruce Fields68993202006-12-13 00:35:23 -08001022 if (IS_ERR(exp))
1023 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001024 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001025 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 return rv;
1027}
1028
1029/* Iterator */
1030
1031static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001032 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033{
1034 loff_t n = *pos;
1035 unsigned hash, export;
1036 struct cache_head *ch;
1037
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 read_lock(&svc_export_cache.hash_lock);
1039 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001040 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 hash = n >> 32;
1042 export = n & ((1LL<<32) - 1);
1043
1044
1045 for (ch=export_table[hash]; ch; ch=ch->next)
1046 if (!export--)
1047 return ch;
1048 n &= ~((1LL<<32) - 1);
1049 do {
1050 hash++;
1051 n += 1LL<<32;
1052 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1053 if (hash >= EXPORT_HASHMAX)
1054 return NULL;
1055 *pos = n+1;
1056 return export_table[hash];
1057}
1058
1059static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1060{
1061 struct cache_head *ch = p;
1062 int hash = (*pos >> 32);
1063
Greg Banksbc6f02e2006-10-02 02:17:49 -07001064 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 hash = 0;
1066 else if (ch->next == NULL) {
1067 hash++;
1068 *pos += 1LL<<32;
1069 } else {
1070 ++*pos;
1071 return ch->next;
1072 }
1073 *pos &= ~((1LL<<32) - 1);
1074 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1075 hash++;
1076 *pos += 1LL<<32;
1077 }
1078 if (hash >= EXPORT_HASHMAX)
1079 return NULL;
1080 ++*pos;
1081 return export_table[hash];
1082}
1083
1084static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001085 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
1087 read_unlock(&svc_export_cache.hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088}
1089
1090static struct flags {
1091 int flag;
1092 char *name[2];
1093} expflags[] = {
1094 { NFSEXP_READONLY, {"ro", "rw"}},
1095 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1096 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1097 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1098 { NFSEXP_ASYNC, {"async", "sync"}},
1099 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1100 { NFSEXP_NOHIDE, {"nohide", ""}},
1101 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1102 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1103 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
Steve Dicksoneb4c86c2009-09-09 14:58:22 -04001104 { NFSEXP_V4ROOT, {"v4root", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105 { 0, {"", ""}}
1106};
1107
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001108static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001111 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
1113 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001114 if (flg->flag & ~mask)
1115 continue;
1116 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 if (*flg->name[state])
1118 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1119 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001120}
1121
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001122static void show_secinfo_flags(struct seq_file *m, int flags)
1123{
1124 seq_printf(m, ",");
1125 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1126}
1127
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001128static bool secinfo_flags_equal(int f, int g)
1129{
1130 f &= NFSEXP_SECINFO_FLAGS;
1131 g &= NFSEXP_SECINFO_FLAGS;
1132 return f == g;
1133}
1134
1135static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1136{
1137 int flags;
1138
1139 flags = (*fp)->flags;
1140 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1141 (*fp)++;
1142 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1143 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1144 (*fp)++;
1145 }
1146 return flags;
1147}
1148
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001149static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1150{
1151 struct exp_flavor_info *f;
1152 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001153 int flags;
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001154
1155 if (exp->ex_nflavors == 0)
1156 return;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001157 f = exp->ex_flavors;
1158 flags = show_secinfo_run(m, &f, end);
1159 if (!secinfo_flags_equal(flags, exp->ex_flags))
1160 show_secinfo_flags(m, flags);
1161 while (f != end) {
1162 flags = show_secinfo_run(m, &f, end);
1163 show_secinfo_flags(m, flags);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001164 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001165}
1166
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001167static void exp_flags(struct seq_file *m, int flag, int fsid,
1168 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1169{
1170 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001172 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001174 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001176 seq_printf(m, ",anongid=%u", anong);
Manoj Naik93346912006-10-04 02:16:18 -07001177 if (fsloc && fsloc->locations_count > 0) {
1178 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1179 int i;
1180
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001181 seq_printf(m, ",%s=", loctype);
Manoj Naik93346912006-10-04 02:16:18 -07001182 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1183 seq_putc(m, '@');
1184 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1185 for (i = 1; i < fsloc->locations_count; i++) {
1186 seq_putc(m, ';');
1187 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1188 seq_putc(m, '@');
1189 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1190 }
1191 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192}
1193
1194static int e_show(struct seq_file *m, void *p)
1195{
1196 struct cache_head *cp = p;
1197 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198
Greg Banksbc6f02e2006-10-02 02:17:49 -07001199 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 seq_puts(m, "# Version 1.1\n");
1201 seq_puts(m, "# Path Client(Flags) # IPs\n");
1202 return 0;
1203 }
1204
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 cache_get(&exp->h);
1206 if (cache_check(&svc_export_cache, &exp->h, NULL))
1207 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001208 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 return svc_export_show(m, &svc_export_cache, cp);
1210}
1211
James Morris88e9d342009-09-22 16:43:43 -07001212const struct seq_operations nfs_exports_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 .start = e_start,
1214 .next = e_next,
1215 .stop = e_stop,
1216 .show = e_show,
1217};
1218
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220/*
1221 * Initialize the exports module.
1222 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001223int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224nfsd_export_init(void)
1225{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001226 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227 dprintk("nfsd: initializing export module.\n");
1228
Stanislav Kinsburskyf5c8593b2011-12-07 12:57:56 +03001229 rv = cache_register_net(&svc_export_cache, &init_net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001230 if (rv)
1231 return rv;
Stanislav Kinsburskyf5c8593b2011-12-07 12:57:56 +03001232 rv = cache_register_net(&svc_expkey_cache, &init_net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001233 if (rv)
Stanislav Kinsburskyf5c8593b2011-12-07 12:57:56 +03001234 cache_unregister_net(&svc_export_cache, &init_net);
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001235 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
1237}
1238
1239/*
1240 * Flush exports table - called when last nfsd thread is killed
1241 */
1242void
1243nfsd_export_flush(void)
1244{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 cache_purge(&svc_expkey_cache);
1246 cache_purge(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247}
1248
1249/*
1250 * Shutdown the exports module.
1251 */
1252void
1253nfsd_export_shutdown(void)
1254{
1255
1256 dprintk("nfsd: shutting down export module.\n");
1257
Stanislav Kinsburskyf5c8593b2011-12-07 12:57:56 +03001258 cache_unregister_net(&svc_expkey_cache, &init_net);
1259 cache_unregister_net(&svc_export_cache, &init_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260 svcauth_unix_purge();
1261
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 dprintk("nfsd: export shutdown complete.\n");
1263}