blob: f4cc1e2bfc54201f5b478068dca20d1862e709bf [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
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/nfsd/syscall.h>
Aurélien Charbonf15364b2008-01-18 15:50:56 +010020#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Boaz Harrosh9a74af22009-12-03 20:30:56 +020022#include "nfsd.h"
J. Bruce Fields1557aca2009-12-04 19:36:06 -050023#include "nfsfh.h"
Boaz Harrosh9a74af22009-12-03 20:30:56 +020024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27typedef struct auth_domain svc_client;
28typedef struct svc_export svc_export;
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030/*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39#define EXPKEY_HASHBITS 8
40#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42static struct cache_head *expkey_table[EXPKEY_HASHMAX];
43
Adrian Bunk74cae612006-03-27 01:15:10 -080044static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
NeilBrownbaab9352006-03-27 01:15:09 -080046 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
47
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080049 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080051 auth_domain_put(key->ek_client);
52 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
55static void expkey_request(struct cache_detail *cd,
56 struct cache_head *h,
57 char **bpp, int *blen)
58{
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
61 char type[5];
62
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
67 (*bpp)[-1] = '\n';
68}
69
Trond Myklebustbc74b4f2009-08-09 15:14:29 -040070static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
71{
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
73}
74
NeilBrown8d270f7f2006-03-27 01:15:04 -080075static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
76static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080077static struct cache_detail svc_expkey_cache;
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
80{
81 /* client fsidtype fsid [path] */
82 char *buf;
83 int len;
84 struct auth_domain *dom = NULL;
85 int err;
86 int fsidtype;
87 char *ep;
88 struct svc_expkey key;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040089 struct svc_expkey *ek = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 if (mesg[mlen-1] != '\n')
92 return -EINVAL;
93 mesg[mlen-1] = 0;
94
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
96 err = -ENOMEM;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040097 if (!buf)
98 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 err = -EINVAL;
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
102 goto out;
103
104 err = -ENOENT;
105 dom = auth_domain_find(buf);
106 if (!dom)
107 goto out;
108 dprintk("found domain %s\n", buf);
109
110 err = -EINVAL;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 fsidtype = simple_strtoul(buf, &ep, 10);
114 if (*ep)
115 goto out;
116 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700117 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 goto out;
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
120 goto out;
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
123 goto out;
124
125 /* OK, we seem to have a valid key */
126 key.h.flags = 0;
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
129 goto out;
130
131 key.ek_client = dom;
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
134
NeilBrown8d270f7f2006-03-27 01:15:04 -0800135 ek = svc_expkey_lookup(&key);
136 err = -ENOMEM;
137 if (!ek)
138 goto out;
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800141 err = -EINVAL;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400142 len = qword_get(&mesg, buf, PAGE_SIZE);
143 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 goto out;
145 dprintk("Path seems to be <%s>\n", buf);
146 err = 0;
147 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800149 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400150 if (!ek)
151 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 } else {
Al Viroa63bb992008-08-02 01:03:36 -0400153 err = kern_path(buf, 0, &key.ek_path);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400154 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 goto out;
156
157 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800158
NeilBrown8d270f7f2006-03-27 01:15:04 -0800159 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400160 if (!ek)
NeilBrown8d270f7f2006-03-27 01:15:04 -0800161 err = -ENOMEM;
Al Viroa63bb992008-08-02 01:03:36 -0400162 path_put(&key.ek_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
164 cache_flush();
165 out:
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400166 if (ek)
167 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (dom)
169 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800170 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 return err;
172}
173
174static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
177{
178 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800179 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 if (h ==NULL) {
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
183 return 0;
184 }
185 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
187 ek->ek_fsidtype);
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
192 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800193 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195 seq_printf(m, "\n");
196 return 0;
197}
NeilBrown8d270f7f2006-03-27 01:15:04 -0800198
199static inline int expkey_match (struct cache_head *a, struct cache_head *b)
200{
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
203
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
207 return 0;
208 return 1;
209}
210
211static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
213{
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
216
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800220
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f7f2006-03-27 01:15:04 -0800222}
223
224static inline void expkey_update(struct cache_head *cnew,
225 struct cache_head *citem)
226{
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
229
Jan Bluncke83aece2008-02-14 19:38:41 -0800230 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800232}
233
234static struct cache_head *expkey_alloc(void)
235{
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
237 if (i)
238 return &i->h;
239 else
240 return NULL;
241}
242
Adrian Bunk74cae612006-03-27 01:15:10 -0800243static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700244 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 .hash_size = EXPKEY_HASHMAX,
246 .hash_table = expkey_table,
247 .name = "nfsd.fh",
248 .cache_put = expkey_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400249 .cache_upcall = expkey_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 .cache_parse = expkey_parse,
251 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800252 .match = expkey_match,
253 .init = expkey_init,
254 .update = expkey_update,
255 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256};
257
NeilBrown61f86032010-02-03 17:31:31 +1100258static int
259svc_expkey_hash(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800261 int hash = item->ek_fsidtype;
262 char * cp = (char*)item->ek_fsid;
263 int len = key_len(item->ek_fsidtype);
264
265 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
266 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
267 hash &= EXPKEY_HASHMASK;
NeilBrown61f86032010-02-03 17:31:31 +1100268 return hash;
269}
270
271static struct svc_expkey *
272svc_expkey_lookup(struct svc_expkey *item)
273{
274 struct cache_head *ch;
275 int hash = svc_expkey_hash(item);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800276
277 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
278 hash);
279 if (ch)
280 return container_of(ch, struct svc_expkey, h);
281 else
282 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
NeilBrown8d270f7f2006-03-27 01:15:04 -0800285static struct svc_expkey *
286svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800288 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100289 int hash = svc_expkey_hash(new);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800290
291 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
292 &old->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300#define EXPORT_HASHBITS 8
301#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303static struct cache_head *export_table[EXPORT_HASHMAX];
304
Manoj Naik933469192006-10-04 02:16:18 -0700305static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
306{
307 int i;
308
309 for (i = 0; i < fsloc->locations_count; i++) {
310 kfree(fsloc->locations[i].path);
311 kfree(fsloc->locations[i].hosts);
312 }
313 kfree(fsloc->locations);
314}
315
NeilBrownbaab9352006-03-27 01:15:09 -0800316static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
NeilBrownbaab9352006-03-27 01:15:09 -0800318 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800319 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800320 auth_domain_put(exp->ex_client);
Jan Blunck54775492008-02-14 19:38:39 -0800321 kfree(exp->ex_pathname);
Manoj Naik933469192006-10-04 02:16:18 -0700322 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800323 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324}
325
326static void svc_export_request(struct cache_detail *cd,
327 struct cache_head *h,
328 char **bpp, int *blen)
329{
330 /* client path */
331 struct svc_export *exp = container_of(h, struct svc_export, h);
332 char *pth;
333
334 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800335 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (IS_ERR(pth)) {
337 /* is this correct? */
338 (*bpp)[0] = '\n';
339 return;
340 }
341 qword_add(bpp, blen, pth);
342 (*bpp)[-1] = '\n';
343}
344
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400345static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
346{
347 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
348}
349
Adrian Bunk74cae612006-03-27 01:15:10 -0800350static struct svc_export *svc_export_update(struct svc_export *new,
351 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800352static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
J. Bruce Fields774b1472009-12-13 20:21:48 -0500354static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355{
356
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500357 /*
358 * We currently export only dirs, regular files, and (for v4
359 * pseudoroot) symlinks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 */
361 if (!S_ISDIR(inode->i_mode) &&
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500362 !S_ISLNK(inode->i_mode) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 !S_ISREG(inode->i_mode))
364 return -ENOTDIR;
365
J. Bruce Fields774b1472009-12-13 20:21:48 -0500366 /*
367 * Mountd should never pass down a writeable V4ROOT export, but,
368 * just to make sure:
369 */
370 if (*flags & NFSEXP_V4ROOT)
371 *flags |= NFSEXP_READONLY;
372
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 /* There are two requirements on a filesystem to be exportable.
374 * 1: We must be able to identify the filesystem from a number.
375 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800376 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 * 2: We must be able to find an inode from a filehandle.
378 * This means that s_export_op must be set.
379 */
380 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
J. Bruce Fields774b1472009-12-13 20:21:48 -0500381 !(*flags & NFSEXP_FSID) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800382 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700383 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 return -EINVAL;
385 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700386
387 if (!inode->i_sb->s_export_op ||
388 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 dprintk("exp_export: export of invalid fs type.\n");
390 return -EINVAL;
391 }
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 return 0;
394
395}
396
Manoj Naik933469192006-10-04 02:16:18 -0700397#ifdef CONFIG_NFSD_V4
398
399static int
400fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
401{
402 int len;
403 int migrated, i, err;
404
Manoj Naik933469192006-10-04 02:16:18 -0700405 /* listsize */
406 err = get_int(mesg, &fsloc->locations_count);
407 if (err)
408 return err;
409 if (fsloc->locations_count > MAX_FS_LOCATIONS)
410 return -EINVAL;
411 if (fsloc->locations_count == 0)
412 return 0;
413
414 fsloc->locations = kzalloc(fsloc->locations_count
415 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
416 if (!fsloc->locations)
417 return -ENOMEM;
418 for (i=0; i < fsloc->locations_count; i++) {
419 /* colon separated host list */
420 err = -EINVAL;
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].hosts)
427 goto out_free_all;
428 err = -EINVAL;
429 /* slash separated path component list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].path)
436 goto out_free_all;
437 }
438 /* migrated */
439 err = get_int(mesg, &migrated);
440 if (err)
441 goto out_free_all;
442 err = -EINVAL;
443 if (migrated < 0 || migrated > 1)
444 goto out_free_all;
445 fsloc->migrated = migrated;
446 return 0;
447out_free_all:
448 nfsd4_fslocs_free(fsloc);
449 return err;
450}
451
Andy Adamsone677bfe2007-07-17 04:04:42 -0700452static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
453{
454 int listsize, err;
455 struct exp_flavor_info *f;
456
457 err = get_int(mesg, &listsize);
458 if (err)
459 return err;
460 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
461 return -EINVAL;
462
463 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
464 err = get_int(mesg, &f->pseudoflavor);
465 if (err)
466 return err;
467 /*
Roel Kluin80492e72009-04-21 16:08:39 +0200468 * XXX: It would be nice to also check whether this
469 * pseudoflavor is supported, so we can discover the
470 * problem at export time instead of when a client fails
471 * to authenticate.
Andy Adamsone677bfe2007-07-17 04:04:42 -0700472 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700473 err = get_int(mesg, &f->flags);
474 if (err)
475 return err;
476 /* Only some flags are allowed to differ between flavors: */
477 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
478 return -EINVAL;
479 }
480 exp->ex_nflavors = listsize;
481 return 0;
482}
483
Manoj Naik933469192006-10-04 02:16:18 -0700484#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700485static inline int
486fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
487static inline int
488secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700489#endif
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
492{
493 /* client path expiry [flags anonuid anongid fsid] */
494 char *buf;
495 int len;
496 int err;
497 struct auth_domain *dom = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400498 struct svc_export exp = {}, *expp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 int an_int;
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 if (mesg[mlen-1] != '\n')
502 return -EINVAL;
503 mesg[mlen-1] = 0;
504
505 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Al Viroc1a2a472008-08-02 01:01:02 -0400506 if (!buf)
507 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 /* client */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400511 len = qword_get(&mesg, buf, PAGE_SIZE);
512 if (len <= 0)
513 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 err = -ENOENT;
516 dom = auth_domain_find(buf);
517 if (!dom)
518 goto out;
519
520 /* path */
521 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400522 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
523 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Al Viroc1a2a472008-08-02 01:01:02 -0400525 err = kern_path(buf, 0, &exp.ex_path);
526 if (err)
527 goto out1;
528
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 exp.ex_client = dom;
Al Viroc1a2a472008-08-02 01:01:02 -0400530
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700531 err = -ENOMEM;
Al Viroc1a2a472008-08-02 01:01:02 -0400532 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
Jan Blunck54775492008-02-14 19:38:39 -0800533 if (!exp.ex_pathname)
Al Viroc1a2a472008-08-02 01:01:02 -0400534 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 /* expiry */
537 err = -EINVAL;
538 exp.h.expiry_time = get_expiry(&mesg);
539 if (exp.h.expiry_time == 0)
Al Viroc1a2a472008-08-02 01:01:02 -0400540 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 /* flags */
543 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700544 if (err == -ENOENT) {
545 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700547 } else {
Al Viroc1a2a472008-08-02 01:01:02 -0400548 if (err || an_int < 0)
549 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 exp.ex_flags= an_int;
551
552 /* anon uid */
553 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400554 if (err)
555 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 exp.ex_anon_uid= an_int;
557
558 /* anon gid */
559 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400560 if (err)
561 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 exp.ex_anon_gid= an_int;
563
564 /* fsid */
565 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400566 if (err)
567 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 exp.ex_fsid = an_int;
569
NeilBrownaf6a4e22007-02-14 00:33:12 -0800570 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
571 if (strcmp(buf, "fsloc") == 0)
572 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
573 else if (strcmp(buf, "uuid") == 0) {
574 /* expect a 16 byte uuid encoded as \xXXXX... */
575 len = qword_get(&mesg, buf, PAGE_SIZE);
576 if (len != 16)
577 err = -EINVAL;
578 else {
579 exp.ex_uuid =
580 kmemdup(buf, 16, GFP_KERNEL);
581 if (exp.ex_uuid == NULL)
582 err = -ENOMEM;
583 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700584 } else if (strcmp(buf, "secinfo") == 0)
585 err = secinfo_parse(&mesg, buf, &exp);
586 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800587 /* quietly ignore unknown words and anything
588 * following. Newer user-space can try to set
589 * new values, then see what the result was.
590 */
591 break;
592 if (err)
Al Viroc1a2a472008-08-02 01:01:02 -0400593 goto out4;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800594 }
Manoj Naik933469192006-10-04 02:16:18 -0700595
J. Bruce Fields774b1472009-12-13 20:21:48 -0500596 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800597 exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400598 if (err)
599 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 }
601
NeilBrown4f7774c2006-03-27 01:15:03 -0800602 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800604 expp = svc_export_update(&exp, expp);
605 else
606 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800608 if (expp == NULL)
609 err = -ENOMEM;
610 else
611 exp_put(expp);
Al Viroc1a2a472008-08-02 01:01:02 -0400612out4:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800613 nfsd4_fslocs_free(&exp.ex_fslocs);
614 kfree(exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400615out3:
Jan Blunck54775492008-02-14 19:38:39 -0800616 kfree(exp.ex_pathname);
Al Viroc1a2a472008-08-02 01:01:02 -0400617out2:
618 path_put(&exp.ex_path);
619out1:
620 auth_domain_put(dom);
621out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800622 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 return err;
624}
625
Manoj Naik933469192006-10-04 02:16:18 -0700626static void exp_flags(struct seq_file *m, int flag, int fsid,
627 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700628static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629
630static int svc_export_show(struct seq_file *m,
631 struct cache_detail *cd,
632 struct cache_head *h)
633{
634 struct svc_export *exp ;
635
636 if (h ==NULL) {
637 seq_puts(m, "#path domain(flags)\n");
638 return 0;
639 }
640 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800641 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 seq_putc(m, '\t');
643 seq_escape(m, exp->ex_client->name, " \t\n\\");
644 seq_putc(m, '(');
645 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800646 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700647 exp_flags(m, exp->ex_flags, exp->ex_fsid,
648 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800649 if (exp->ex_uuid) {
650 int i;
651 seq_puts(m, ",uuid=");
652 for (i=0; i<16; i++) {
653 if ((i&3) == 0 && i)
654 seq_putc(m, ':');
655 seq_printf(m, "%02x", exp->ex_uuid[i]);
656 }
657 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700658 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800659 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 seq_puts(m, ")\n");
661 return 0;
662}
NeilBrown4f7774c2006-03-27 01:15:03 -0800663static int svc_export_match(struct cache_head *a, struct cache_head *b)
664{
665 struct svc_export *orig = container_of(a, struct svc_export, h);
666 struct svc_export *new = container_of(b, struct svc_export, h);
667 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800668 orig->ex_path.dentry == new->ex_path.dentry &&
669 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800670}
671
672static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
673{
674 struct svc_export *new = container_of(cnew, struct svc_export, h);
675 struct svc_export *item = container_of(citem, struct svc_export, h);
676
677 kref_get(&item->ex_client->ref);
678 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800679 new->ex_path.dentry = dget(item->ex_path.dentry);
680 new->ex_path.mnt = mntget(item->ex_path.mnt);
681 new->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700682 new->ex_fslocs.locations = NULL;
683 new->ex_fslocs.locations_count = 0;
684 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800685}
686
687static void export_update(struct cache_head *cnew, struct cache_head *citem)
688{
689 struct svc_export *new = container_of(cnew, struct svc_export, h);
690 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700691 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800692
693 new->ex_flags = item->ex_flags;
694 new->ex_anon_uid = item->ex_anon_uid;
695 new->ex_anon_gid = item->ex_anon_gid;
696 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800697 new->ex_uuid = item->ex_uuid;
698 item->ex_uuid = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800699 new->ex_pathname = item->ex_pathname;
700 item->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700701 new->ex_fslocs.locations = item->ex_fslocs.locations;
702 item->ex_fslocs.locations = NULL;
703 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
704 item->ex_fslocs.locations_count = 0;
705 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
706 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700707 new->ex_nflavors = item->ex_nflavors;
708 for (i = 0; i < MAX_SECINFO_LIST; i++) {
709 new->ex_flavors[i] = item->ex_flavors[i];
710 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800711}
712
713static struct cache_head *svc_export_alloc(void)
714{
715 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
716 if (i)
717 return &i->h;
718 else
719 return NULL;
720}
721
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700723 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 .hash_size = EXPORT_HASHMAX,
725 .hash_table = export_table,
726 .name = "nfsd.export",
727 .cache_put = svc_export_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400728 .cache_upcall = svc_export_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 .cache_parse = svc_export_parse,
730 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800731 .match = svc_export_match,
732 .init = svc_export_init,
733 .update = export_update,
734 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735};
736
NeilBrown61f86032010-02-03 17:31:31 +1100737static int
738svc_export_hash(struct svc_export *exp)
739{
740 int hash;
741
742 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
743 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
744 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
745 return hash;
746}
747
NeilBrown4f7774c2006-03-27 01:15:03 -0800748static struct svc_export *
749svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750{
NeilBrown4f7774c2006-03-27 01:15:03 -0800751 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100752 int hash = svc_export_hash(exp);
NeilBrown4f7774c2006-03-27 01:15:03 -0800753
754 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
755 hash);
756 if (ch)
757 return container_of(ch, struct svc_export, h);
758 else
759 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760}
761
Adrian Bunk74cae612006-03-27 01:15:10 -0800762static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800763svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764{
NeilBrown4f7774c2006-03-27 01:15:03 -0800765 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100766 int hash = svc_export_hash(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
NeilBrown4f7774c2006-03-27 01:15:03 -0800768 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
769 &old->h,
770 hash);
771 if (ch)
772 return container_of(ch, struct svc_export, h);
773 else
774 return NULL;
775}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
777
Adrian Bunk74cae612006-03-27 01:15:10 -0800778static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
780{
781 struct svc_expkey key, *ek;
782 int err;
783
784 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700785 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 key.ek_client = clp;
788 key.ek_fsidtype = fsid_type;
789 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
790
NeilBrown8d270f7f2006-03-27 01:15:04 -0800791 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700792 if (ek == NULL)
793 return ERR_PTR(-ENOMEM);
794 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
795 if (err)
796 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 return ek;
798}
799
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800
Al Viro55430e22009-04-18 02:04:46 -0400801static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
802 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
804 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700805 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800806
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700808 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 key.ex_client = clp;
Al Viro55430e22009-04-18 02:04:46 -0400811 key.ex_path = *path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
NeilBrown4f7774c2006-03-27 01:15:03 -0800813 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700814 if (exp == NULL)
815 return ERR_PTR(-ENOMEM);
816 err = cache_check(&svc_export_cache, &exp->h, reqp);
817 if (err)
818 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 return exp;
820}
821
822/*
823 * Find the export entry for a given dentry.
824 */
Al Viro5bf3bd22009-04-18 02:14:32 -0400825static struct svc_export *exp_parent(svc_client *clp, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826{
Al Viro5bf3bd22009-04-18 02:14:32 -0400827 struct dentry *saved = dget(path->dentry);
828 svc_export *exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Al Viro5bf3bd22009-04-18 02:14:32 -0400830 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
831 struct dentry *parent = dget_parent(path->dentry);
832 dput(path->dentry);
833 path->dentry = parent;
834 exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 }
Al Viro5bf3bd22009-04-18 02:14:32 -0400836 dput(path->dentry);
837 path->dentry = saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 return exp;
839}
840
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843/*
844 * Obtain the root fh on behalf of a client.
845 * This could be done in user space, but I feel that it adds some safety
846 * since its harder to fool a kernel module than a user space program.
847 */
848int
Al Viroa63bb992008-08-02 01:03:36 -0400849exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
851 struct svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -0400852 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 struct inode *inode;
854 struct svc_fh fh;
855 int err;
856
857 err = -EPERM;
858 /* NB: we probably ought to check that it's NUL-terminated */
Al Viroa63bb992008-08-02 01:03:36 -0400859 if (kern_path(name, 0, &path)) {
860 printk("nfsd: exp_rootfh path not found %s", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 return err;
862 }
Al Viroa63bb992008-08-02 01:03:36 -0400863 inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
865 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Al Viroa63bb992008-08-02 01:03:36 -0400866 name, path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 inode->i_sb->s_id, inode->i_ino);
Al Viro5bf3bd22009-04-18 02:14:32 -0400868 exp = exp_parent(clp, &path);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -0800869 if (IS_ERR(exp)) {
870 err = PTR_ERR(exp);
871 goto out;
872 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 /*
875 * fh must be initialized before calling fh_compose
876 */
877 fh_init(&fh, maxsize);
Al Viroa63bb992008-08-02 01:03:36 -0400878 if (fh_compose(&fh, exp, path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 err = -EINVAL;
880 else
881 err = 0;
882 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
883 fh_put(&fh);
884 exp_put(exp);
885out:
Al Viroa63bb992008-08-02 01:03:36 -0400886 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 return err;
888}
889
Adrian Bunkcce76f92007-10-16 01:27:52 -0700890static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
891 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -0800892{
893 struct svc_export *exp;
894 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700895 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -0800896 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800897
Al Viro55430e22009-04-18 02:04:46 -0400898 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -0800899 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800900
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700901 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -0800902 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800903 return exp;
904}
905
Andy Adamson32c1eb02007-07-17 04:04:48 -0700906__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
907{
908 struct exp_flavor_info *f;
909 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
910
911 /* legacy gss-only clients are always OK: */
912 if (exp->ex_client == rqstp->rq_gssclient)
913 return 0;
914 /* ip-address based client; check sec= export option: */
915 for (f = exp->ex_flavors; f < end; f++) {
916 if (f->pseudoflavor == rqstp->rq_flavor)
917 return 0;
918 }
919 /* defaults in absence of sec= options: */
920 if (exp->ex_nflavors == 0) {
921 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
922 rqstp->rq_flavor == RPC_AUTH_UNIX)
923 return 0;
924 }
925 return nfserr_wrongsec;
926}
927
J. Bruce Fields0989a782007-07-17 04:04:44 -0700928/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700929 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
930 * auth_unix client) if it's available and has secinfo information;
931 * otherwise, will try to use rq_gssclient.
932 *
J. Bruce Fields0989a782007-07-17 04:04:44 -0700933 * Called from functions that handle requests; functions that do work on
934 * behalf of mountd are passed a single client name to use, and should
935 * use exp_get_by_name() or exp_find().
936 */
937struct svc_export *
Al Viro91c9fa82009-04-18 02:42:05 -0400938rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -0700939{
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700940 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700941
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700942 if (rqstp->rq_client == NULL)
943 goto gss;
944
945 /* First try the auth_unix client: */
Al Viro91c9fa82009-04-18 02:42:05 -0400946 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700947 if (PTR_ERR(exp) == -ENOENT)
948 goto gss;
949 if (IS_ERR(exp))
950 return exp;
951 /* If it has secinfo, assume there are no gss/... clients */
952 if (exp->ex_nflavors > 0)
953 return exp;
954gss:
955 /* Otherwise, try falling back on gss client */
956 if (rqstp->rq_gssclient == NULL)
957 return exp;
Al Viro91c9fa82009-04-18 02:42:05 -0400958 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700959 if (PTR_ERR(gssexp) == -ENOENT)
960 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700961 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700962 exp_put(exp);
963 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700964}
965
966struct svc_export *
967rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
968{
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700969 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -0700970
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700971 if (rqstp->rq_client == NULL)
972 goto gss;
973
974 /* First try the auth_unix client: */
975 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
976 if (PTR_ERR(exp) == -ENOENT)
977 goto gss;
978 if (IS_ERR(exp))
979 return exp;
980 /* If it has secinfo, assume there are no gss/... clients */
981 if (exp->ex_nflavors > 0)
982 return exp;
983gss:
984 /* Otherwise, try falling back on gss client */
985 if (rqstp->rq_gssclient == NULL)
986 return exp;
987 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
988 &rqstp->rq_chandle);
989 if (PTR_ERR(gssexp) == -ENOENT)
990 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -0700991 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -0700992 exp_put(exp);
993 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -0700994}
995
996struct svc_export *
Al Viroe64c3902009-04-18 03:00:46 -0400997rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -0700998{
Al Viroe64c3902009-04-18 03:00:46 -0400999 struct dentry *saved = dget(path->dentry);
1000 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001001
Al Viroe64c3902009-04-18 03:00:46 -04001002 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1003 struct dentry *parent = dget_parent(path->dentry);
1004 dput(path->dentry);
1005 path->dentry = parent;
1006 exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001007 }
Al Viroe64c3902009-04-18 03:00:46 -04001008 dput(path->dentry);
1009 path->dentry = saved;
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001010 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001011}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001012
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001013static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1014{
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001015 u32 fsidv[2];
1016
1017 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1018
J. Bruce Fields260c64d2010-02-08 13:42:26 -05001019 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001020}
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022/*
1023 * Called when we need the filehandle for the root of the pseudofs,
1024 * for a given NFSv4 client. The root is defined to be the
1025 * export point with fsid==0
1026 */
Al Viroc7afef12006-10-19 23:29:02 -07001027__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001028exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001030 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001031 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001033 exp = find_fsidzero_export(rqstp);
J.Bruce Fields68993202006-12-13 00:35:23 -08001034 if (IS_ERR(exp))
1035 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001036 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001037 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 return rv;
1039}
1040
1041/* Iterator */
1042
1043static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001044 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045{
1046 loff_t n = *pos;
1047 unsigned hash, export;
1048 struct cache_head *ch;
1049
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 read_lock(&svc_export_cache.hash_lock);
1051 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001052 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 hash = n >> 32;
1054 export = n & ((1LL<<32) - 1);
1055
1056
1057 for (ch=export_table[hash]; ch; ch=ch->next)
1058 if (!export--)
1059 return ch;
1060 n &= ~((1LL<<32) - 1);
1061 do {
1062 hash++;
1063 n += 1LL<<32;
1064 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1065 if (hash >= EXPORT_HASHMAX)
1066 return NULL;
1067 *pos = n+1;
1068 return export_table[hash];
1069}
1070
1071static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1072{
1073 struct cache_head *ch = p;
1074 int hash = (*pos >> 32);
1075
Greg Banksbc6f02e2006-10-02 02:17:49 -07001076 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 hash = 0;
1078 else if (ch->next == NULL) {
1079 hash++;
1080 *pos += 1LL<<32;
1081 } else {
1082 ++*pos;
1083 return ch->next;
1084 }
1085 *pos &= ~((1LL<<32) - 1);
1086 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1087 hash++;
1088 *pos += 1LL<<32;
1089 }
1090 if (hash >= EXPORT_HASHMAX)
1091 return NULL;
1092 ++*pos;
1093 return export_table[hash];
1094}
1095
1096static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001097 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098{
1099 read_unlock(&svc_export_cache.hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100}
1101
1102static struct flags {
1103 int flag;
1104 char *name[2];
1105} expflags[] = {
1106 { NFSEXP_READONLY, {"ro", "rw"}},
1107 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1108 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1109 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1110 { NFSEXP_ASYNC, {"async", "sync"}},
1111 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1112 { NFSEXP_NOHIDE, {"nohide", ""}},
1113 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1114 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1115 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
Steve Dicksoneb4c86c2009-09-09 14:58:22 -04001116 { NFSEXP_V4ROOT, {"v4root", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 { 0, {"", ""}}
1118};
1119
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001120static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001123 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124
1125 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001126 if (flg->flag & ~mask)
1127 continue;
1128 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 if (*flg->name[state])
1130 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1131 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001132}
1133
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001134static void show_secinfo_flags(struct seq_file *m, int flags)
1135{
1136 seq_printf(m, ",");
1137 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1138}
1139
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001140static bool secinfo_flags_equal(int f, int g)
1141{
1142 f &= NFSEXP_SECINFO_FLAGS;
1143 g &= NFSEXP_SECINFO_FLAGS;
1144 return f == g;
1145}
1146
1147static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1148{
1149 int flags;
1150
1151 flags = (*fp)->flags;
1152 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1153 (*fp)++;
1154 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1155 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1156 (*fp)++;
1157 }
1158 return flags;
1159}
1160
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001161static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1162{
1163 struct exp_flavor_info *f;
1164 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001165 int flags;
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001166
1167 if (exp->ex_nflavors == 0)
1168 return;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001169 f = exp->ex_flavors;
1170 flags = show_secinfo_run(m, &f, end);
1171 if (!secinfo_flags_equal(flags, exp->ex_flags))
1172 show_secinfo_flags(m, flags);
1173 while (f != end) {
1174 flags = show_secinfo_run(m, &f, end);
1175 show_secinfo_flags(m, flags);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001176 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001177}
1178
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001179static void exp_flags(struct seq_file *m, int flag, int fsid,
1180 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1181{
1182 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001184 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001186 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001188 seq_printf(m, ",anongid=%u", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001189 if (fsloc && fsloc->locations_count > 0) {
1190 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1191 int i;
1192
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001193 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001194 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1195 seq_putc(m, '@');
1196 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1197 for (i = 1; i < fsloc->locations_count; i++) {
1198 seq_putc(m, ';');
1199 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1200 seq_putc(m, '@');
1201 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1202 }
1203 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001204}
1205
1206static int e_show(struct seq_file *m, void *p)
1207{
1208 struct cache_head *cp = p;
1209 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210
Greg Banksbc6f02e2006-10-02 02:17:49 -07001211 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 seq_puts(m, "# Version 1.1\n");
1213 seq_puts(m, "# Path Client(Flags) # IPs\n");
1214 return 0;
1215 }
1216
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 cache_get(&exp->h);
1218 if (cache_check(&svc_export_cache, &exp->h, NULL))
1219 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001220 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 return svc_export_show(m, &svc_export_cache, cp);
1222}
1223
James Morris88e9d342009-09-22 16:43:43 -07001224const struct seq_operations nfs_exports_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 .start = e_start,
1226 .next = e_next,
1227 .stop = e_stop,
1228 .show = e_show,
1229};
1230
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231
1232/*
1233 * Initialize the exports module.
1234 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001235int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236nfsd_export_init(void)
1237{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001238 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 dprintk("nfsd: initializing export module.\n");
1240
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001241 rv = cache_register(&svc_export_cache);
1242 if (rv)
1243 return rv;
1244 rv = cache_register(&svc_expkey_cache);
1245 if (rv)
1246 cache_unregister(&svc_export_cache);
1247 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248
1249}
1250
1251/*
1252 * Flush exports table - called when last nfsd thread is killed
1253 */
1254void
1255nfsd_export_flush(void)
1256{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 cache_purge(&svc_expkey_cache);
1258 cache_purge(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259}
1260
1261/*
1262 * Shutdown the exports module.
1263 */
1264void
1265nfsd_export_shutdown(void)
1266{
1267
1268 dprintk("nfsd: shutting down export module.\n");
1269
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -05001270 cache_unregister(&svc_expkey_cache);
1271 cache_unregister(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 svcauth_unix_purge();
1273
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 dprintk("nfsd: export shutdown complete.\n");
1275}