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36#include <linux/err.h>
37#include <linux/sunrpc/svc.h>
38#include <linux/nfsd/nfsd.h>
39#include <linux/nfs4.h>
40#include <linux/nfsd/state.h>
41#include <linux/nfsd/xdr4.h>
42#include <linux/param.h>
43#include <linux/file.h>
44#include <linux/namei.h>
45#include <asm/uaccess.h>
46#include <linux/scatterlist.h>
47#include <linux/crypto.h>
48#include <linux/sched.h>
49#include <linux/mount.h>
50
51#define NFSDDBG_FACILITY NFSDDBG_PROC
52
53
54static struct path rec_dir;
55static int rec_dir_init = 0;
56
57static void
58nfs4_save_user(uid_t *saveuid, gid_t *savegid)
59{
60 *saveuid = current->fsuid;
61 *savegid = current->fsgid;
62 current->fsuid = 0;
63 current->fsgid = 0;
64}
65
66static void
67nfs4_reset_user(uid_t saveuid, gid_t savegid)
68{
69 current->fsuid = saveuid;
70 current->fsgid = savegid;
71}
72
73static void
74md5_to_hex(char *out, char *md5)
75{
76 int i;
77
78 for (i=0; i<16; i++) {
79 unsigned char c = md5[i];
80
81 *out++ = '0' + ((c&0xf0)>>4) + (c>=0xa0)*('a'-'9'-1);
82 *out++ = '0' + (c&0x0f) + ((c&0x0f)>=0x0a)*('a'-'9'-1);
83 }
84 *out = '\0';
85}
86
87__be32
88nfs4_make_rec_clidname(char *dname, struct xdr_netobj *clname)
89{
90 struct xdr_netobj cksum;
91 struct hash_desc desc;
92 struct scatterlist sg;
93 __be32 status = nfserr_resource;
94
95 dprintk("NFSD: nfs4_make_rec_clidname for %.*s\n",
96 clname->len, clname->data);
97 desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
98 desc.tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);
99 if (IS_ERR(desc.tfm))
100 goto out_no_tfm;
101 cksum.len = crypto_hash_digestsize(desc.tfm);
102 cksum.data = kmalloc(cksum.len, GFP_KERNEL);
103 if (cksum.data == NULL)
104 goto out;
105
106 sg_init_one(&sg, clname->data, clname->len);
107
108 if (crypto_hash_digest(&desc, &sg, sg.length, cksum.data))
109 goto out;
110
111 md5_to_hex(dname, cksum.data);
112
113 kfree(cksum.data);
114 status = nfs_ok;
115out:
116 crypto_free_hash(desc.tfm);
117out_no_tfm:
118 return status;
119}
120
121static void
122nfsd4_sync_rec_dir(void)
123{
124 mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
125 nfsd_sync_dir(rec_dir.dentry);
126 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
127}
128
129int
130nfsd4_create_clid_dir(struct nfs4_client *clp)
131{
132 char *dname = clp->cl_recdir;
133 struct dentry *dentry;
134 uid_t uid;
135 gid_t gid;
136 int status;
137
138 dprintk("NFSD: nfsd4_create_clid_dir for \"%s\"\n", dname);
139
140 if (!rec_dir_init || clp->cl_firststate)
141 return 0;
142
143 nfs4_save_user(&uid, &gid);
144
145
146 mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
147
148 dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
149 if (IS_ERR(dentry)) {
150 status = PTR_ERR(dentry);
151 goto out_unlock;
152 }
153 status = -EEXIST;
154 if (dentry->d_inode) {
155 dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
156 goto out_put;
157 }
158 status = mnt_want_write(rec_dir.mnt);
159 if (status)
160 goto out_put;
161 status = vfs_mkdir(rec_dir.dentry->d_inode, dentry, S_IRWXU);
162 mnt_drop_write(rec_dir.mnt);
163out_put:
164 dput(dentry);
165out_unlock:
166 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
167 if (status == 0) {
168 clp->cl_firststate = 1;
169 nfsd4_sync_rec_dir();
170 }
171 nfs4_reset_user(uid, gid);
172 dprintk("NFSD: nfsd4_create_clid_dir returns %d\n", status);
173 return status;
174}
175
176typedef int (recdir_func)(struct dentry *, struct dentry *);
177
178struct dentry_list {
179 struct dentry *dentry;
180 struct list_head list;
181};
182
183struct dentry_list_arg {
184 struct list_head dentries;
185 struct dentry *parent;
186};
187
188static int
189nfsd4_build_dentrylist(void *arg, const char *name, int namlen,
190 loff_t offset, u64 ino, unsigned int d_type)
191{
192 struct dentry_list_arg *dla = arg;
193 struct list_head *dentries = &dla->dentries;
194 struct dentry *parent = dla->parent;
195 struct dentry *dentry;
196 struct dentry_list *child;
197
198 if (name && isdotent(name, namlen))
199 return 0;
200 dentry = lookup_one_len(name, parent, namlen);
201 if (IS_ERR(dentry))
202 return PTR_ERR(dentry);
203 child = kmalloc(sizeof(*child), GFP_KERNEL);
204 if (child == NULL)
205 return -ENOMEM;
206 child->dentry = dentry;
207 list_add(&child->list, dentries);
208 return 0;
209}
210
211static int
212nfsd4_list_rec_dir(struct dentry *dir, recdir_func *f)
213{
214 struct file *filp;
215 struct dentry_list_arg dla = {
216 .parent = dir,
217 };
218 struct list_head *dentries = &dla.dentries;
219 struct dentry_list *child;
220 uid_t uid;
221 gid_t gid;
222 int status;
223
224 if (!rec_dir_init)
225 return 0;
226
227 nfs4_save_user(&uid, &gid);
228 INIT_LIST_HEAD(dentries);
229
230 filp = dentry_open(dget(dir), mntget(rec_dir.mnt), O_RDONLY);
231 status = PTR_ERR(filp);
232 if (IS_ERR(filp))
233 goto out;
234 status = vfs_readdir(filp, nfsd4_build_dentrylist, &dla);
235 fput(filp);
236 while (!list_empty(dentries)) {
237 child = list_entry(dentries->next, struct dentry_list, list);
238 status = f(dir, child->dentry);
239 if (status)
240 goto out;
241 list_del(&child->list);
242 dput(child->dentry);
243 kfree(child);
244 }
245out:
246 while (!list_empty(dentries)) {
247 child = list_entry(dentries->next, struct dentry_list, list);
248 list_del(&child->list);
249 dput(child->dentry);
250 kfree(child);
251 }
252 nfs4_reset_user(uid, gid);
253 return status;
254}
255
256static int
257nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
258{
259 int status;
260
261 if (!S_ISREG(dir->d_inode->i_mode)) {
262 printk("nfsd4: non-file found in client recovery directory\n");
263 return -EINVAL;
264 }
265 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
266 status = vfs_unlink(dir->d_inode, dentry);
267 mutex_unlock(&dir->d_inode->i_mutex);
268 return status;
269}
270
271static int
272nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
273{
274 int status;
275
276
277
278
279 nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
280 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
281 status = vfs_rmdir(dir->d_inode, dentry);
282 mutex_unlock(&dir->d_inode->i_mutex);
283 return status;
284}
285
286static int
287nfsd4_unlink_clid_dir(char *name, int namlen)
288{
289 struct dentry *dentry;
290 int status;
291
292 dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
293
294 mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
295 dentry = lookup_one_len(name, rec_dir.dentry, namlen);
296 mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
297 if (IS_ERR(dentry)) {
298 status = PTR_ERR(dentry);
299 return status;
300 }
301 status = -ENOENT;
302 if (!dentry->d_inode)
303 goto out;
304
305 status = nfsd4_clear_clid_dir(rec_dir.dentry, dentry);
306out:
307 dput(dentry);
308 return status;
309}
310
311void
312nfsd4_remove_clid_dir(struct nfs4_client *clp)
313{
314 uid_t uid;
315 gid_t gid;
316 int status;
317
318 if (!rec_dir_init || !clp->cl_firststate)
319 return;
320
321 status = mnt_want_write(rec_dir.mnt);
322 if (status)
323 goto out;
324 clp->cl_firststate = 0;
325 nfs4_save_user(&uid, &gid);
326 status = nfsd4_unlink_clid_dir(clp->cl_recdir, HEXDIR_LEN-1);
327 nfs4_reset_user(uid, gid);
328 if (status == 0)
329 nfsd4_sync_rec_dir();
330 mnt_drop_write(rec_dir.mnt);
331out:
332 if (status)
333 printk("NFSD: Failed to remove expired client state directory"
334 " %.*s\n", HEXDIR_LEN, clp->cl_recdir);
335 return;
336}
337
338static int
339purge_old(struct dentry *parent, struct dentry *child)
340{
341 int status;
342
343 if (nfs4_has_reclaimed_state(child->d_name.name))
344 return 0;
345
346 status = nfsd4_clear_clid_dir(parent, child);
347 if (status)
348 printk("failed to remove client recovery directory %s\n",
349 child->d_name.name);
350
351 return 0;
352}
353
354void
355nfsd4_recdir_purge_old(void) {
356 int status;
357
358 if (!rec_dir_init)
359 return;
360 status = mnt_want_write(rec_dir.mnt);
361 if (status)
362 goto out;
363 status = nfsd4_list_rec_dir(rec_dir.dentry, purge_old);
364 if (status == 0)
365 nfsd4_sync_rec_dir();
366 mnt_drop_write(rec_dir.mnt);
367out:
368 if (status)
369 printk("nfsd4: failed to purge old clients from recovery"
370 " directory %s\n", rec_dir.dentry->d_name.name);
371}
372
373static int
374load_recdir(struct dentry *parent, struct dentry *child)
375{
376 if (child->d_name.len != HEXDIR_LEN - 1) {
377 printk("nfsd4: illegal name %s in recovery directory\n",
378 child->d_name.name);
379
380 return 0;
381 }
382 nfs4_client_to_reclaim(child->d_name.name);
383 return 0;
384}
385
386int
387nfsd4_recdir_load(void) {
388 int status;
389
390 status = nfsd4_list_rec_dir(rec_dir.dentry, load_recdir);
391 if (status)
392 printk("nfsd4: failed loading clients from recovery"
393 " directory %s\n", rec_dir.dentry->d_name.name);
394 return status;
395}
396
397
398
399
400
401void
402nfsd4_init_recdir(char *rec_dirname)
403{
404 uid_t uid = 0;
405 gid_t gid = 0;
406 int status;
407
408 printk("NFSD: Using %s as the NFSv4 state recovery directory\n",
409 rec_dirname);
410
411 BUG_ON(rec_dir_init);
412
413 nfs4_save_user(&uid, &gid);
414
415 status = kern_path(rec_dirname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
416 &rec_dir);
417 if (status)
418 printk("NFSD: unable to find recovery directory %s\n",
419 rec_dirname);
420
421 if (!status)
422 rec_dir_init = 1;
423 nfs4_reset_user(uid, gid);
424}
425
426void
427nfsd4_shutdown_recdir(void)
428{
429 if (!rec_dir_init)
430 return;
431 rec_dir_init = 0;
432 path_put(&rec_dir);
433}
434
